Remove github package workflow

Create armel build targets for cross compilation

.cargo/config

@@ -1,9 +0,0 @@
-[target.armv7-unknown-linux-gnueabihf]
-linker = "arm-linux-gnueabihf-gcc"
-objcopy = { path = "arm-linux-gnueabihf-objcopy" }
-strip = { path = "arm-linux-gnueabihf-strip" }
-
-[target.arm-unknown-linux-gnueabihf]
-linker = "arm-linux-gnueabihf-gcc"
-objcopy = { path = "arm-linux-gnueabihf-objcopy" }
-strip = { path = "arm-linux-gnueabihf-strip" }

.github/FUNDING.yml

@@ -0,0 +1,12 @@
+# These are supported funding model platforms
+
+github: [dswd]
+patreon: # Replace with a single Patreon username
+open_collective: # Replace with a single Open Collective username
+ko_fi: # Replace with a single Ko-fi username
+tidelift: # Replace with a single Tidelift platform-name/package-name e.g., npm/babel
+community_bridge: # Replace with a single Community Bridge project-name e.g., cloud-foundry
+liberapay: dswd
+issuehunt: # Replace with a single IssueHunt username
+otechie: # Replace with a single Otechie username
+custom: ['https://paypal.me/dswd73']

.github/ISSUE_TEMPLATE/bug_report.md

@@ -0,0 +1,27 @@
+---
+name: Bug report
+about: Report a bug
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+### Describe the bug
+A clear and concise description of what the bug is.
+
+### Details of your setup
+
+**VpnCloud version:**
+
+**Description of your VPN setup**
+- How many nodes?
+- Any NAT involved?
+- Any custom routing?
+
+**Config file contents**
+normally in `/etc/vpncloud/MYNET.net`
+:bangbang: make sure to mask (`***`) passwords and public IPs/hostnames :bangbang:
+
+**Log entries**
+normally in `/var/log/vpncloud.MYNET.log`

.github/ISSUE_TEMPLATE/config.yml

@@ -0,0 +1,8 @@
+blank_issues_enabled: false
+contact_links:
+  - name: VpnCloud Documentation
+    url: https://vpncloud.ddswd.de/docs
+    about: Please check the documentation before asking how things work.
+  - name: Discussion Group on GitHub
+    url: https://github.com/dswd/vpncloud/discussions
+    about: Please discuss or ask anything there that is not an issue.

.github/ISSUE_TEMPLATE/feature_request.md

@@ -0,0 +1,16 @@
+---
+name: Feature request
+about: Suggest an idea for this project
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+** Describe the high-level goal you want to achieve **
+
+I would like to...
+
+** Describe the proposed solution **
+
+I propose to...

.github/ISSUE_TEMPLATE/issue_template.md

@@ -0,0 +1,14 @@
+---
+name: Other issue
+about: Any other issue
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+### Describe your issue
+
+👉 Please use the [Discussion group](https://github.com/dswd/vpncloud/discussions) if you...
+* just want to ask a question
+* want to discuss a new feature

.github/actions/build-deb/Dockerfile

@@ -0,0 +1,20 @@
+FROM ubuntu:16.04
+
+RUN apt-get update \
+ && apt-get install -y --no-install-recommends \
+    build-essential \
+    curl \
+    gcc-aarch64-linux-gnu \
+    gcc-arm-linux-gnueabihf \
+    gcc-arm-linux-gnueabi \
+    libc6-dev-arm64-cross \
+    libc6-dev-armhf-cross \
+    libc6-dev-armel-cross \
+    libc6-dev-i386 \
+    gcc-5-multilib \
+    asciidoctor \
+ && apt-get clean && rm -rf /var/lib/apt/lists/*
+
+ADD entrypoint.sh /entrypoint.sh
+
+ENTRYPOINT /entrypoint.sh

.github/actions/build-deb/action.yml

@@ -0,0 +1,5 @@
+name: 'build-deb'
+description: 'Create deb packages'
+runs:
+  using: 'docker'
+  image: 'Dockerfile'

.github/actions/build-deb/entrypoint.sh

@@ -0,0 +1,37 @@
+#!/bin/bash
+
+set -e
+
+TOOLCHAIN=$(grep -e '^toolchain =' Cargo.toml | sed -e 's/toolchain = "\(.*\)"/\1/')
+
+VERSION=$(grep -e '^version =' Cargo.toml | sed -e 's/version = "\(.*\)"/\1/')
+DEB_VERSION=$(echo "$VERSION" | sed -e 's/-/~/g')
+
+ln -s asm-generic/ /usr/include/asm
+
+curl https://sh.rustup.rs -sSf | sh -s -- -y --default-toolchain ${TOOLCHAIN}
+source $HOME/.cargo/env
+
+rustup target add i686-unknown-linux-gnu
+rustup target add armv5te-unknown-linux-gnueabi
+rustup target add armv7-unknown-linux-gnueabihf
+rustup target add aarch64-unknown-linux-gnu
+
+cargo install cargo-deb
+
+mkdir dist
+
+build_deb() {
+  ARCH=$1
+  TARGET=$2
+  cargo deb --target ${TARGET}
+  cp target/${TARGET}/debian/vpncloud_${DEB_VERSION}_${ARCH}.deb dist/vpncloud_${DEB_VERSION}_${ARCH}.deb
+}
+
+cargo deb
+cp target/debian/vpncloud_${DEB_VERSION}_amd64.deb dist/vpncloud_${DEB_VERSION}_amd64.deb
+
+build_deb i386 i686-unknown-linux-gnu
+build_deb armhf armv7-unknown-linux-gnueabihf
+build_deb armel armv5te-unknown-linux-gnueabi
+build_deb arm64 aarch64-unknown-linux-gnu

.github/actions/build-rpm/Dockerfile

@@ -0,0 +1,13 @@
+FROM centos:7
+
+RUN yum groupinstall -y 'Development Tools'
+RUN yum install -y ruby && gem install asciidoctor -v 2.0.10
+RUN yum install -y libstdc++-*.i686 \
+ && yum install -y glibc-*.i686 \
+ && yum install -y libgcc.i686
+
+RUN ln -s /usr/bin/gcc /usr/bin/i686-linux-gnu-gcc
+
+ADD entrypoint.sh /entrypoint.sh
+
+ENTRYPOINT /entrypoint.sh

.github/actions/build-rpm/action.yml

@@ -0,0 +1,5 @@
+name: 'build-deb'
+description: 'Create deb packages'
+runs:
+  using: 'docker'
+  image: 'Dockerfile'

.github/actions/build-rpm/entrypoint.sh

@@ -0,0 +1,41 @@
+#!/bin/bash
+
+set -e
+
+TOOLCHAIN=$(grep -e '^toolchain =' Cargo.toml | sed -e 's/toolchain = "\(.*\)"/\1/')
+
+VERSION=$(grep -e '^version =' Cargo.toml | sed -e 's/version = "\(.*\)"/\1/')
+if echo "$VERSION" | fgrep -q "-"; then
+  RPM_VERSION=$(echo "$VERSION" | sed -e 's/-/-0./g')
+else
+  RPM_VERSION="$VERSION-1"
+fi
+
+curl https://sh.rustup.rs -sSf | sh -s -- -y --default-toolchain ${TOOLCHAIN}
+source $HOME/.cargo/env
+
+rustup target add i686-unknown-linux-gnu
+rustup target add armv7-unknown-linux-gnueabihf
+
+cargo install cargo-rpm
+
+mkdir dist
+
+cargo build --release
+cargo rpm build
+cp target/release/rpmbuild/RPMS/x86_64/vpncloud-${RPM_VERSION}.x86_64.rpm dist/vpncloud_${RPM_VERSION}.x86_64.rpm
+
+
+build_rpm() {
+  ARCH=$1
+  TARGET=$2
+  if ! [ -f dist/vpncloud_${RPM_VERSION}.${ARCH}.rpm ]; then
+    mkdir -p target
+    [ -L target/assets ] || ln -s ../assets target/assets
+    [ -L target/target ] || ln -s ../target target/target
+    cargo rpm build --target ${TARGET}
+    cp target/${TARGET}/release/rpmbuild/RPMS/${ARCH}/vpncloud-${RPM_VERSION}.${ARCH}.rpm dist/vpncloud_${RPM_VERSION}.${ARCH}.rpm
+  fi
+}
+
+build_rpm i686 i686-unknown-linux-gnu

.github/actions/build-static/Dockerfile

@@ -0,0 +1,21 @@
+FROM ubuntu:16.04
+
+RUN apt-get update \
+ && apt-get install -y --no-install-recommends \
+    build-essential \
+    curl \
+    gcc-aarch64-linux-gnu \
+    gcc-arm-linux-gnueabihf \
+    gcc-arm-linux-gnueabi \
+    libc6-dev-arm64-cross \
+    libc6-dev-armhf-cross \
+    libc6-dev-armel-cross \
+    libc6-dev-i386 \
+    gcc-5-multilib \
+    asciidoctor \
+    musl musl-dev musl-tools \
+ && apt-get clean && rm -rf /var/lib/apt/lists/*
+
+ADD entrypoint.sh /entrypoint.sh
+
+ENTRYPOINT /entrypoint.sh

.github/actions/build-static/action.yml

@@ -0,0 +1,5 @@
+name: 'build-static'
+description: 'Create static binaries'
+runs:
+  using: 'docker'
+  image: 'Dockerfile'

.github/actions/build-static/entrypoint.sh

@@ -0,0 +1,39 @@
+#!/bin/bash
+
+set -e
+
+TOOLCHAIN=$(grep -e '^toolchain =' Cargo.toml | sed -e 's/toolchain = "\(.*\)"/\1/')
+UPX_VERSION=$(grep -e '^upx_version =' Cargo.toml | sed -e 's/upx_version = "\(.*\)"/\1/')
+
+VERSION=$(grep -e '^version =' Cargo.toml | sed -e 's/version = "\(.*\)"/\1/')
+DEB_VERSION=$(echo "$VERSION" | sed -e 's/-/~/g')
+
+ln -s asm-generic/ /usr/include/asm
+ln -s /usr/bin/aarch64-linux-gnu-gcc /usr/bin/aarch64-linux-musl-gcc
+ln -s /usr/bin/arm-linux-gnueabihf-gcc /usr/bin/arm-linux-musleabihf-gcc
+
+curl https://sh.rustup.rs -sSf | sh -s -- -y --default-toolchain ${TOOLCHAIN}
+source $HOME/.cargo/env
+
+rustup target add x86_64-unknown-linux-musl
+rustup target add i686-unknown-linux-musl
+rustup target add armv5te-unknown-linux-musleabi
+rustup target add armv7-unknown-linux-musleabihf
+rustup target add aarch64-unknown-linux-musl
+
+curl https://github.com/upx/upx/releases/download/v${UPX_VERSION}/upx-${UPX_VERSION}-amd64_linux.tar.xz -Lf | tar -xJ --strip-components=1 -C /usr/bin
+
+mkdir dist
+
+build_static() {
+  ARCH=$1
+  TARGET=$2
+  cargo build --release --features installer --target ${TARGET} && upx --lzma target/${TARGET}/release/vpncloud
+  cp target/${TARGET}/release/vpncloud ../dist/vpncloud_${VERSION}_static_${ARCH}
+}
+
+build_static amd64 x86_64-unknown-linux-musl
+#build_static i386 i686-unknown-linux-musl
+build_static armhf armv7-unknown-linux-musleabihf
+build_static armel armv5te-unknown-linux-musleabi
+build_static arm64 aarch64-unknown-linux-musl

.github/dependabot.yml

@@ -0,0 +1,11 @@
+# To get started with Dependabot version updates, you'll need to specify which
+# package ecosystems to update and where the package manifests are located.
+# Please see the documentation for all configuration options:
+# https://help.github.com/github/administering-a-repository/configuration-options-for-dependency-updates
+
+version: 2
+updates:
+  - package-ecosystem: "cargo" # See documentation for possible values
+    directory: "/" # Location of package manifests
+    schedule:
+      interval: "daily"

.github/workflows/audit.yml

@@ -0,0 +1,12 @@
+name: Security audit
+on:
+  schedule:
+    - cron: '0 0 * * *'
+jobs:
+  audit:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions-rs/audit-check@v1
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}

.github/workflows/build.yml

@@ -1,15 +0,0 @@
-name: Build
-
-on: [push]
-
-jobs:
-  build:
-
-    runs-on: ubuntu-latest
-
-    steps:
-    - uses: actions/checkout@v1
-    - name: Build
-      run: cargo build --verbose
-    - name: Run tests
-      run: cargo test --verbose

.github/workflows/check.yml

@@ -0,0 +1,32 @@
+name: Checks
+on: [push]
+jobs:
+  check:
+    name: Check
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions-rs/toolchain@v1
+        with:
+          profile: minimal
+          toolchain: stable
+          override: true
+      - uses: actions-rs/cargo@v1
+        with:
+          command: check
+  test:
+    name: Test Suite
+    runs-on: ubuntu-latest
+    steps:
+      - uses: szenius/set-timezone@v1.0
+        with:
+          timezoneLinux: Europe/Berlin
+      - uses: actions/checkout@v2
+      - uses: actions-rs/toolchain@v1
+        with:
+          profile: minimal
+          toolchain: stable
+          override: true
+      - uses: actions-rs/cargo@v1
+        with:
+          command: test

.gitignore

@@ -9,3 +9,6 @@ dist
 builder/cache
 .idea
 release.sh
+__pycache__
+*.pem
+.vscode

.rpm/vpncloud.spec

@@ -1,44 +0,0 @@
-%define __spec_install_post %{nil}
-%define __os_install_post %{_dbpath}/brp-compress
-%define debug_package %{nil}
-
-Name: vpncloud
-Summary: Peer-to-peer VPN
-Version: @@VERSION@@
-Release: 1
-License: GPL-3.0
-Group: Applications/System
-Source0: %{name}-%{version}.tar.gz
-URL: https://vpncloud.ddswd.de
-
-BuildRoot: %{_tmppath}/%{name}-%{version}-%{release}-root
-
-%description
-%{summary}
-
-%prep
-%setup -q
-
-%install
-rm -rf %{buildroot}
-mkdir -p %{buildroot}
-mkdir -p %{buildroot}/etc/vpncloud
-mkdir -p %{buildroot}/lib/systemd/system
-mkdir -p %{buildroot}/usr/share/man/man1
-cp %{buildroot}/../../../../../assets/example.net.disabled %{buildroot}/etc/vpncloud/example.net.disabled
-cp %{buildroot}/../../../../../assets/vpncloud@.service %{buildroot}/lib/systemd/system/vpncloud@.service
-cp %{buildroot}/../../../../../target/vpncloud.1.gz %{buildroot}/usr/share/man/man1/vpncloud.1.gz
-cp -a * %{buildroot}
-
-%clean
-rm -rf %{buildroot}
-
-%files
-/etc/vpncloud
-/etc/vpncloud/example.net.disabled
-/usr/bin/vpncloud
-/lib/systemd/system/vpncloud@.service
-/usr/share/man/man1/vpncloud.1.gz
-
-%defattr(-,root,root,-)
-%{_bindir}/*

.travis.yml

@@ -1,37 +0,0 @@
-dist: xenial
-sudo: required
-language: rust
-cache: cargo
-rust:
-  - nightly
-  - beta
-  - stable
-matrix:
-  allow_failures:
-    - rust: nightly
-addons:
-  apt:
-    packages:
-      - libcurl4-openssl-dev
-      - libelf-dev
-      - libdw-dev
-      - binutils-dev
-      - cmake
-      - ruby-ronn
-before_script:
-  - export PATH=$HOME/.cargo/bin:$PATH
-  - cargo install cargo-update || echo "cargo-update already installed"
-  - cargo install cargo-travis || echo "cargo-travis already installed"
-  - cargo install-update -a # update outdated cached binaries
-script:
-  - |
-      cargo build && cargo test
-after_success:
-  - cargo coveralls
-env:
-  global:
-    - TRAVIS_CARGO_NIGHTLY_FEATURE=""
-notifications:
-  email:
-    on_success: never
-

CHANGELOG.md

@@ -2,6 +2,132 @@
 
 This project follows [semantic versioning](http://semver.org).
 
+### UNRELEASED
+
+- [changed] Changed Rust version to 1.75.0
+- [changed] Updated dependencies
+- [fixed] Fix error when IPv6 is not available
+
+### v2.3.0 (2021-12-23)
+
+- [added] Added build for armv5te (thanks to xek)
+- [added] Option to specify advertised addresses
+- [added] Peers now learn their own address from peers
+- [changed] Changed Rust version to 1.57.0
+- [changed] Updated dependencies
+- [fixed] Fixed problem with IPv4 addresses in listen option
+- [fixed] Fixed periodic broadcast messages in switch mode
+
+### v2.2.0 (2021-04-06)
+
+- [added] Service target file (thanks to mnhauke)
+- [added] Added interactive configuration wizard
+- [added] Support for (un-)installation
+- [added] Building static binaries
+- [added] Building i686 rpm
+- [changed] Restructured example config
+- [changed] Changed Rust version to 1.51.0
+- [changed] Updated dependencies
+- [changed] Change permissions of /etc/vpncloud
+
+### v2.1.0 (2021-02-06)
+
+- [added] Support for websocket proxy mode
+- [added] Support for hook scripts to handle certain situations
+- [added] Support for creating shell completions
+- [removed] Removed dummy device type
+- [changed] Updated dependencies
+- [changed] Changed Rust version to 1.49.0
+- [fixed] Added missing peer address propagation
+- [fixed] Fixed problem with peer addresses without port
+
+### v2.0.1 (2020-11-07)
+
+- [changed] Changed documentation
+- [changed] Updated dependencies
+- [changed] Retrying connections for 120 secs
+- [changed] Resetting own addresses periodically
+- [changed] Using smallvec everywhere
+- [changed] Assume default port for peers without port
+- [fixed] Fixed corner case with lost init message
+- [fixed] Do not reconnect to timed out pending connections
+- [fixed] Most specific claims beat less specific claims
+- [fixed] Count all invalid protocol traffic
+- [fixed] Fixed compile with musl
+- [fixed] Fixed time format in logs
+
+### v2.0.0 (2020-10-30)
+
+- [added] **Add strong crypto, complete rewrite of crypto system**
+- [added] Automatically claim addresses based on interface addresses (disable with --no-auto-claim)
+- [added] Allow to give --ip instead of ifup cmd
+- [added] Automatically set optimal MTU on interface
+- [added] Warning for disabled or loose rp_filter setting
+- [added] Add --fix-rp-filter to fix rp filter settings
+- [added] Offer to migrate old configs
+- [changed] **Complete change of network protocol**
+- [changed] Negotiate crypto method per peer, select best method
+- [changed] Make encryption the default, no encryption must be stated explicitly
+- [changed] Changed default device type to TUN
+- [changed] Rename subnet to claim
+- [changed] Set peer exchange interval to 5 minutes
+- [changed] Periodically send claims with peer list
+- [changed] Changed Rust version to 1.47.0
+- [removed] Remove network-id parameter
+- [removed] Remove port config option in favor of --listen
+
+### UNRELEASED v1.x.y
+
+- [added] Added crypto option AES128
+- [added] Default port for peers
+- [changed] Updated dependencies
+- [changed] Removed C code, now 100% Rust
+- [fixed] Fixed keepalive for small timeouts
+- [fixed] Fixed problem with port forwarding
+- [fixed] Fixed problem with TUN on dynamic host addresses
+
+### v1.4.0 (2020-06-03)
+
+- [added] Added option to listen on specified IP
+- [added] Added support for statsd monitoring
+- [changed] No longer using two sockets for ipv4 and ipv6
+- [changed] Warning for missing router is now info
+- [changed] New warning on claimed addresses in learning mode
+- [changed] Rewrote argument parsing
+- [changed] Changed stats file format to YAML
+- [changed] Using asciidoc for manpage
+- [changed] Updated dependencies
+- [fixed] Fixed problem that could lead to 100% cpu consumption
+- [fixed] Fixed startup race condition
+
+### v1.3.0 (2020-01-25)
+
+- [added] Building for aarch64 aka arm64 (thanks to Ivan)
+- [added] Added feature to disable special NAT support
+- [changed] Improved port forwarding on quirky routers
+- [changed] Reduced peer timeout to 5min to work better with NAT
+- [changed] Improved builder scripts
+- [changed] Updated dependencies
+- [fixed] Fixed problem with growing stats file
+
+### v1.2.1 (2019-12-22)
+
+- [fixed] Fixed a problem with service restrictions
+
+### v1.2.0 (2019-12-20)
+
+- [added] Added service restrictions to systemd
+- [changed] Rust version 1.40.0
+- [changed] Also drop privileges in foreground mode
+- [changed] Set builders to Ubuntu 16.04 and CentOS 7
+- [changed] Set keepalive to 120 secs when NAT is detected
+- [changed] Deleting beacon file at shutdown
+- [changed] Updated dependencies
+- [fixed] Added parameter keepalive to manpage
+- [fixed] Fixed problems on stats file when dropping permissions
+- [fixed] Deleting files before overwriting them
+- [fixed] Fixed duplicate port bindings
+
 ### v1.1.0 (2019-12-04)
 
 - [added] Exchange peer timeout and adapt keepalive accordingly

Cargo.toml

@@ -1,47 +1,65 @@
 [package]
 name = "vpncloud"
-version = "1.1.0"
+version = "2.4.0"
 authors = ["Dennis Schwerdel <schwerdel@googlemail.com>"]
-build = "build.rs"
 license = "GPL-3.0"
 description = "Peer-to-peer VPN"
 homepage = "https://vpncloud.ddswd.de"
 repository = "https://github.com/dswd/vpncloud"
 keywords = ["vpn", "p2p", "tun", "tap", "network"]
 readme = "README.md"
-edition = "2018"
+edition = "2021"
+
+[package.metadata]
+toolchain = "1.75.0"
+upx_version = "4.2.2"
 
 [dependencies]
-time = "0.1"
-docopt = "^1"
-serde = "1.0"
-serde_derive = "1.0"
-serde_yaml = "0.8"
+chrono = { version = "0.4", features = ["std", "clock"], default_features = false}
+structopt = "0.3"
+serde = { version = "1.0", features = ["derive"] }
+serde_yaml = "0.9"
 log = { version = "0.4", features = ["std"] }
 signal = "0.7"
 libc = "0.2"
-rand = "0.7"
+rand = "0.8"
 fnv = "1"
-net2 = "0.2"
 yaml-rust = "0.4"
-igd = "0.9"
-siphasher = "0.3"
-daemonize = "0.4"
-ring = "0.16"
+daemonize = "0.5"
+ring = "0.17"
+privdrop = "0.5"
+byteorder = "1.4"
+thiserror = "1.0"
+smallvec = "1.7"
+dialoguer = { version = "0.11", optional = true }
+tungstenite = { version = "0.21", optional = true }
+url = { version = "2.2", optional = true }
+igd = { version = "0.12", optional = true }
 
-[build-dependencies]
-cc = "^1"
-pkg-config = "0.3"
 
 [dev-dependencies]
 tempfile = "3"
+criterion = { version = "0.5", features = ["html_reports"] }
+iai = "0.1"
 
 [features]
-default = []
-bench = []
+default = ["nat", "websocket", "wizard"]
+nat = ["igd"]
+websocket = ["tungstenite", "url"]
+wizard = ["dialoguer"]
+installer = []
+
+[[bench]]
+name = "criterion"
+harness = false
+
+[[bench]]
+name = "valgrind"
+harness = false
 
 [profile.release]
 lto = true
+strip = true
 
 [profile.dev]
 lto = false
@@ -51,22 +69,33 @@ lto = false
 
 [package.metadata.deb]
 extended-description = """\
- VpnCloud is a simple VPN over UDP. It creates a virtual network interface on
- the host and forwards all received data via UDP to the destination. VpnCloud
- establishes a fully-meshed VPN network in a peer-to-peer manner. It can work
- on TUN devices (IP based) and TAP devices (Ethernet based)."""
+ VpnCloud is a high performance peer-to-peer mesh VPN over UDP supporting strong encryption, 
+ NAT traversal and a simple configuration. It establishes a fully-meshed self-healing VPN
+ network in a peer-to-peer manner with strong end-to-end encryption based on elliptic curve
+ keys and AES-256. VpnCloud creates a virtual network interface on the host and forwards all
+ received data via UDP to the destination. It can work on TUN devices (IP based) and TAP 
+ devices (Ethernet based)."""
 license-file = ["LICENSE.md", "1"]
 changelog = "assets/changelog.txt"
 section = "net"
+depends = "libc6 (>= 2.23), libgcc1 (>= 1:6.0.1)"
+maintainer-scripts = "assets/deb-scripts"
 assets = [
   ["target/release/vpncloud", "/usr/bin/vpncloud", "755"],
   ["assets/example.net.disabled", "/etc/vpncloud/example.net.disabled", "600"],
   ["assets/vpncloud@.service", "/lib/systemd/system/vpncloud@.service", "644"],
+  ["assets/vpncloud.target", "/lib/systemd/system/vpncloud.target", "644"],
+  ["assets/vpncloud-wsproxy.service", "/lib/systemd/system/vpncloud-wsproxy.service", "644"],
   ["target/vpncloud.1.gz", "/usr/share/man/man1/vpncloud.1.gz", "644"]
 ]
 
-[package.metadata.rpm.cargo]
-buildflags = ["--release"]
-
-[package.metadata.rpm.targets]
-vpncloud = { path = "/usr/bin/vpncloud" }
+[package.metadata.generate-rpm]
+assets = [
+  { source = "target/release/vpncloud", dest = "/usr/bin/vpncloud", mode = "755" },
+  { source = "assets/example.net.disabled", dest = "/etc/vpncloud/example.net.disabled", mode = "600" },
+  { source = "assets/vpncloud@.service", dest = "/lib/systemd/system/vpncloud@.service", mode = "644" },
+  { source = "assets/vpncloud.target", dest = "/lib/systemd/system/vpncloud.target", mode = "644" },
+  { source = "assets/vpncloud-wsproxy.service", dest = "/lib/systemd/system/vpncloud-wsproxy.service", mode = "644" },
+  { source = "target/vpncloud.1.gz", dest = "/usr/share/man/man1/vpncloud.1.gz", mode = "644" }
+]
+auto-req = "no"

README.md

@@ -1,92 +1,60 @@
 VpnCloud - Peer-to-Peer VPN
 ---------------------------
+![Checks](https://github.com/dswd/vpncloud/workflows/Checks/badge.svg?branch=master)
+![Security audit](https://github.com/dswd/vpncloud/workflows/Security%20audit/badge.svg?branch=master)
 
-[![Build Status](https://travis-ci.org/dswd/vpncloud.svg?branch=master)](https://travis-ci.org/dswd/vpncloud)
-[![Coverage Status](https://coveralls.io/repos/dswd/vpncloud/badge.svg?branch=master&service=github)](https://coveralls.io/github/dswd/vpncloud?branch=master)
+**VpnCloud** is a high performance peer-to-peer mesh VPN over UDP supporting strong encryption, NAT traversal and a simple configuration. It establishes a fully-meshed self-healing VPN network in a peer-to-peer manner with strong end-to-end encryption based on elliptic curve keys and AES-256. VpnCloud creates a virtual network interface on the host and forwards all received data via UDP to the destination. It can work on TUN devices (IP based) and TAP devices (Ethernet based).
 
-**VpnCloud** is a simple VPN over UDP. It creates a virtual network interface on
-the host and forwards all received data via UDP to the destination. VpnCloud
-establishes a fully-meshed VPN network in a peer-to-peer manner. It can work
-on TUN devices (IP based) and TAP devices (Ethernet based). Tunneling traffic
-between two nodes can be as easy as:
+```sh
+$> vpncloud -c REMOTE_HOST:PORT -p 'mypassword' --ip 10.0.0.1/24
+```
 
-       $> vpncloud -c REMOTE_HOST:PORT --ifup 'ifconfig $IFNAME 10.0.0.1/24 mtu 1400 up'
+or as config file:
 
-For more information, please see the [Website](https://vpncloud.ddswd.de).
+```yaml
+crypto:
+  password: mysecret
+ip: 10.0.0.1
+peers:
+  - REMOTE_HOST:PORT
+```
+
+For more information, please see the [Website](https://vpncloud.ddswd.de) or the [Discussions group](https://github.com/dswd/vpncloud/discussions).
 
 
 ### Project Status
 This project is still [under development](CHANGELOG.md) but has reached a
 somewhat stable state. VpnCloud features the following functionality:
 
-* Setting up tunnels between two networks via Ethernet (TAP) and IP (TUN)
-* Connecting multiple networks with multiple forwarding behaviors (Hub, Switch,
-  Router)
-* Encrypted connections
 * Automatic peer-to-peer meshing, no central servers
-* NAT and (limited) firewall traversal using hole punching
 * Automatic reconnecting when connections are lost
-* Non-native forwarding modes, e.g. IP based learning switch and prefix routed
-  Ethernet networks.
+* Connecting hundreds of nodes with the VPN
 * High throughput and low additional latency (see [performance page](https://vpncloud.ddswd.de/features/performance))
-* Support for tunneled VLans (TAP device)
-* Option to hide protocol header
+* Creating virtual network interfaces based on Ethernet (TAP) and IP (TUN)
+* Strong end-to-end encryption using Curve25519 key pairs and AES methods
+* Support for different forwarding/routing behaviors (Hub, Switch, Router)
+* NAT and firewall traversal using hole punching
 * Automatic port forwarding via UPnP
-
+* Websocket proxy mode for restrictive environments
+* Support for tunneled VLans (TAP devices)
+* Support for publishing [beacons](https://vpncloud.ddswd.de/docs/beacons) to help nodes find each others
+* Support for statsd monitoring
+* Low memory footprint
+* Single binary, no dependencies, no kernel module
 
 ### Installing
 
 #### Compiling from source
-Prerequisites: Git, [Cargo](https://www.rust-lang.org/install.html), Ronn
+Prerequisites: Git, [Cargo](https://www.rust-lang.org/install.html), asciidoctor
 
 The checked-out code can be compiled with ``cargo build`` or ``cargo build --release`` (release version). The binary could then be found in `target/release/vpncloud`.
 
 The tests can be run via ``cargo test``.
 
 
-#### Cross-Compiling
-This software can be cross-compiled for a number of different architectures. 
-Please also see the [extended rust cross compilation docs](https://github.com/japaric/rust-cross).
+#### Cross-Compiling & packaging
+Please see the [builder folder](builder).
 
-##### ARMv7 (e.g. Raspberry Pi)
-1. Install the Cargo target
-
-       $> rustup target add armv7-unknown-linux-gnueabihf
-
-2. Install the required build environment (on Ubuntu)
-
-       $> sudo apt-get install -qq gcc-arm-linux-gnueabihf
-
-3. Build the software
-
-       $> cargo build --release --target=armv7-unknown-linux-gnueabihf
-
-#### Debian / Ubuntu
-Deb packages for each release can be found in the
-[releases](https://github.com/dswd/vpncloud/releases) section. Currently only
-packages for amd64 are available (I am accepting help on building and packaging
-for other platforms).
-
-Debian packages can be built using [cargo-deb](https://github.com/mmstick/cargo-deb): ``cargo deb``
-
-
-#### Arch Linux (AUR)
-There is a [VpnCloud package for Arch Linux](https://aur.archlinux.org/packages/vpncloud/)
-thanks to Oscar Rainford (fourbytes).
-
-#### CentOS 7 (maybe other RPM based)
-CentOS 7 .rpm package can be built using [cargo-rpm](https://github.com/RustRPM/cargo-rpm): ``cargo rpm``
-On an CentOS 7:
-
-1. Install the required build environment (on CentOS 7)
-
-       $> yum groupinstall -y 'Development Tools'
- 
-2. Build the software
-
-       $> cargo rpm build
-       
-rpm will be situated in `target/release/rpmbuild/RPMS/`
 
 ### Contributions welcome
 There are several areas in which still some work has to be done and where
@@ -94,6 +62,9 @@ contributions are very welcome:
 
 * **Linux packages**: VpnCloud is stable enough to be packaged for Linux
   distributions. Maintainers who want to package VpnCloud are very welcome.
+* **Help with other platforms**: If you are a Rust developer with experience
+  on Windows or MacOS your help on porting VpnCloud to those platforms is very
+  welcome.
 * **Security review**: The security has been implemented with strong security
   primitives but it would be great if a cryptography expert could verify the
   system.

assets/changelog.txt

@@ -1,3 +1,131 @@
+vpncloud (2.3.0) stable; urgency=medium
+
+ * [added] Added build for armv5te (thanks to xek)
+ * [added] Option to specify advertised addresses
+ * [added] Peers now learn their own address from peers
+ * [changed] Changed Rust version to 1.57.0
+ * [changed] Updated dependencies
+ * [fixed] Fixed problem with IPv4 addresses in listen option
+ * [fixed] Fixed periodic broadcast messages in switch mode
+
+ -- Dennis Schwerdel <schwerdel+vpncloud@googlemail.com>  Thu, 23 Dec 2021 20:41:00 +0100
+
+vpncloud (2.2.0) stable; urgency=medium
+
+ * [added] Service target file (thanks to mnhauke)
+ * [added] Added interactive configuration wizard
+ * [added] Support for (un-)installation
+ * [added] Building static binaries
+ * [added] Building i686 rpm
+ * [changed] Restructured example config
+ * [changed] Changed Rust version to 1.51.0
+ * [changed] Updated dependencies
+ * [changed] Change permissions of /etc/vpncloud
+
+ -- Dennis Schwerdel <schwerdel+vpncloud@googlemail.com>  Tue, 06 Apr 2021 12:27:00 +0200
+
+vpncloud (2.1.0) stable; urgency=medium
+
+  * [added] Support for websocket proxy mode
+  * [added] Support for hook scripts to handle certain situations
+  * [added] Support for creating shell completions
+  * [removed] Removed dummy device type
+  * [changed] Updated dependencies
+  * [changed] Changed Rust version to 1.49.0
+  * [fixed] Added missing peer address propagation
+  * [fixed] Fixed problem with peer addresses without port
+
+ -- Dennis Schwerdel <schwerdel@googlemail.com>  Sat, 06 Feb 2021 13:13:00 +0100
+
+vpncloud (2.0.1) stable; urgency=medium
+
+  * [changed] Changed documentation
+  * [changed] Updated dependencies
+  * [changed] Retrying connections for 120 secs
+  * [changed] Resetting own addresses periodically
+  * [changed] Using smallvec everywhere
+  * [changed] Assume default port for peers without port
+  * [fixed] Fixed corner case with lost init message
+  * [fixed] Do not reconnect to timed out pending connections
+  * [fixed] Most specific claims beat less specific claims
+  * [fixed] Count all invalid protocol traffic
+  * [fixed] Fixed compile with musl
+  * [fixed] Fixed time format in logs
+
+ -- Dennis Schwerdel <schwerdel@googlemail.com>  Sat, 07 Nov 2020 12:28:00 +0100
+
+vpncloud (2.0.0) stable; urgency=medium
+
+  * [added] **Add strong crypto, complete rewrite of crypto system**
+  * [added] Automatically claim addresses based on interface addresses (disable with --no-auto-claim)
+  * [added] Allow to give --ip instead of ifup cmd
+  * [added] Automatically set optimal MTU on interface
+  * [added] Warning for disabled or loose rp_filter setting
+  * [added] Add --fix-rp-filter to fix rp filter settings
+  * [added] Offer to migrate old configs
+  * [changed] **Complete change of network protocol**
+  * [changed] Negotiate crypto method per peer, select best method
+  * [changed] Make encryption the default, no encryption must be stated explicitly
+  * [changed] Changed default device type to TUN
+  * [changed] Rename subnet to claim
+  * [changed] Set peer exchange interval to 5 minutes
+  * [changed] Periodically send claims with peer list
+  * [changed] Changed Rust version to 1.47.0
+  * [removed] Remove network-id parameter
+  * [removed] Remove port config option in favor of --listen
+
+ -- Dennis Schwerdel <schwerdel@googlemail.com>  Fri, 30 Oct 2020 22:07:00 +0100
+
+vpncloud (1.4.0) stable; urgency=medium
+
+  * [added] Added option to listen on specified IP
+  * [added] Added support for statsd monitoring
+  * [changed] No longer using two sockets for ipv4 and ipv6
+  * [changed] Warning for missing router is now info
+  * [changed] New warning on claimed addresses in learning mode
+  * [changed] Rewrote argument parsing
+  * [changed] Changed stats file format to YAML
+  * [changed] Using asciidoc for manpage
+  * [changed] Updated dependencies
+  * [fixed] Fixed problem that could lead to 100% cpu consumption
+  * [fixed] Fixed startup race condition
+
+ -- Dennis Schwerdel <schwerdel@googlemail.com>  Wed, 03 Jun 2020 17:46:00 +0200
+
+vpncloud (1.3.0) stable; urgency=medium
+
+  * [added] Building for aarch64 aka arm64 (thanks to Ivan)
+  * [added] Added feature to disable special NAT support
+  * [changed] Improved port forwarding on quirky routers
+  * [changed] Reduced peer timeout to 5min to work better with NAT
+  * [changed] Improved builder scripts
+  * [changed] Updated dependencies
+  * [fixed] Fixed problem with growing stats file
+
+ -- Dennis Schwerdel <schwerdel@googlemail.com>  Sat, 25 Jan 2020 13:49:34 +0100
+
+vpncloud (1.2.1) stable; urgency=medium
+
+  * [fixed] Fixed a problem with service restrictions
+
+ -- Dennis Schwerdel <schwerdel@googlemail.com>  Sun, 22 Dec 2019 16:47:38 +0100
+
+vpncloud (1.2.0) stable; urgency=medium
+
+  * [added] Added service restrictions to systemd
+  * [changed] Rust version 1.40.0
+  * [changed] Also drop privileges in foreground mode
+  * [changed] Set builders to Ubuntu 16.04 and CentOS 7
+  * [changed] Set keepalive to 120 secs when NAT is detected
+  * [changed] Deleting beacon file at shutdown
+  * [changed] Updated dependencies
+  * [fixed] Added parameter keepalive to manpage
+  * [fixed] Fixed problems on stats file when dropping permissions
+  * [fixed] Deleting files before overwriting them
+  * [fixed] Fixed duplicate port bindings
+
+ -- Dennis Schwerdel <schwerdel@googlemail.com>  Fri, 20 Dec 2019 16:31:07 +0100
+
 vpncloud (1.1.0) stable; urgency=medium
   
   * [added] Exchange peer timeout and adapt keepalive accordingly

assets/deb-scripts/postint

@@ -0,0 +1,4 @@
+#!/bin/bash
+
+systemctl daemon-reload
+chmod 700 /etc/vpncloud

assets/example.net.disabled

@@ -1,88 +1,82 @@
 # This configuration file uses the YAML format.
-
-# This configuration can be enabled/disabled and controlled by adding the
-# network to `/etc/default/vpncloud` and starting/stopping it via
-# `/etc/init.d/vpncloud start/stop` on non-systemd systems and via
-# `systemctl enable/disable vpncloud@NAME` and
-# `service vpncloud@NAME start/stop` on systemd systems.
+# ~ means "no value" (i.e. "default value")
+# Replace it by a value and put quotes (") around values with special characters
+# List items start with a dash and a space (- )
+# Note that the whitespace before the settings names is important for the file structure
 
 
-# The port number on which to listen for data.
-# Note: Every VPN needs a different port number.
-#port: 3210
+listen: 3210                # The port number or ip:port on which to listen for data.
 
-# Address of a peer to connect to. The address should be in the form
-# `addr:port`. If the node is not started, the connection will be retried
-# periodically. This parameter can be repeated to connect to multiple peers.
-# Note: Several entries can be separated by spaces.
-#peers:
-#  - node2.example.com:3210
-#  - node3.example.com:3210
+peers:                      # Address of a peer to connect to. 
+                            # The address should be in the form `addr:port`.
+                            # Put [] for an empty list
+  - node2.example.com:3210
+  - node3.example.com:3210
 
-# Peer timeout in seconds. The peers will exchange information periodically
-# and drop peers that are silent for this period of time.
-#peer_timeout: 1800
+crypto:                     # Crypto settings
+  password: ~  # <-- CHANGE # A password to encrypt the VPN data.
+  private-key: ~            # Private key (alternative to password)
+  public-key: ~             # Public key (alternative to password)
+  trusted-keys: []          # Trusted keys (alternative to password)
+                            # Replace [] with list of keys
 
-# Switch table entry timeout in seconds. This parameter is only used in switch
-# mode. Addresses that have not been seen for the given period of time  will
-# be forgot.
-#dst_timeout: 300
+ip: ~          # <-- CHANGE # An IP address to set on the device, e.g. 10.0.0.1
+                            # Must be different for every node on the VPN
 
-# An optional token that identifies the network and helps to distinguish it
-# from other networks.
-#magic: "76706e01"
 
-# An optional shared key to encrypt the VPN data. If this option is not set,
-# the traffic will be sent unencrypted.
-#shared_key: ""
+# ------------------ Advanced features ahead --------------------
 
-# The encryption method to use ("aes256", or "chacha20"). Most current CPUs
-# have special support for AES256 so this should be faster. For older
-# computers lacking this support, only CHACHA20 is supported.
-#crypto: chacha20
+auto-claim: true            # Whether to automatically claim the configured IP on tun devices
 
-# Name of the virtual device. Any `%d` will be filled with a free number.
-#device_name: "vpncloud%d"
-
-# Set the type of network. There are two options: **tap** devices process
-# Ethernet frames **tun** devices process IP packets. [default: `tap`]
-#device_type: tap
-
-# The mode of the VPN. The VPN can like a router, a switch or a hub. A **hub**
-# will send all data always to all peers. A **switch** will learn addresses
-# from incoming data and only send data to all peers when the address is
-# unknown. A **router** will send data according to known subnets of the
-# peers and ignore them otherwise. The **normal** mode is switch for tap
-# devices and router for tun devices. [default: `normal`]
-#mode: normal
-
-# The local subnets to use. This parameter should be in the form
-# `address/prefixlen` where address is an IPv4 address, an IPv6 address, or a
-# MAC address. The prefix length is the number of significant front bits that
-# distinguish the subnet from other subnets. Example: `10.1.1.0/24`.
-# Note: Several entries can be separated by spaces.
-#subnets:
+claims:                     # The local subnets to use. This parameter should be in the form
+                            # `address/prefixlen` where address is an IPv4 address, an IPv6 address, or a
+                            # MAC address. The prefix length is the number of significant front bits that
+                            # distinguish the subnet from other subnets.
 #  - 10.1.1.0/24
 
-# A command to setup the network interface. The command will be run (as
-# parameter to `sh -c`) when the device has been created to configure it.
-# The name of the allocated device will be available via the environment
-# variable `IFNAME`.
-#ifup: ""
+ifup: ~                     # Command to setup the interface. Use $IFNAME for interface name.
+ifdown: ~                   # Command to tear down the interface. Use $IFNAME for interface name.
 
-# A command to bring down the network interface. The command will be run (as
-# parameter to `sh -c`) to remove any configuration from the device.
-# The name of the allocated device will be available via the environment
-# variable `IFNAME`.
-#ifdown: ""
+device:                     # Device settings
+  name: "vpncloud%d"        # Name of the virtual device. Any `%d` will be filled with a free number.
+  type: tun                 # Set the type of network. There are two options: **tap** devices process
+                            # Ethernet frames **tun** devices process IP packets. [default: `tun`]
+  path: "/dev/net/tun"      # Path of the tun device
+  fix-rp-filter: false      # Whether to fix detected rp-filter problems
 
-# Store the process id in this file when running in the background. If set,
-# the given file will be created containing the process id of the new
-# background process. This option is only used when running in background.
-#pid_file: ""
+mode: normal                # Mode to run in, "normal", "hub", "switch", or "router" (see manpage)
 
-# Change the user and/or group of the process once all the setup has been
-# done and before spawning the background process. This option is only used
-# when running in background.
-#user: ""
-#group: ""
+port-forwarding: true       # Try to map a port on the router
+
+switch-timeout: 300         # Switch timeout in seconds (switch mode only)
+
+peer-timeout: 300           # Peer timeout in seconds
+keepalive: ~                # Keepalive interval in seconds
+
+beacon:                     # Beacon settings
+  store: ~                  # File or command (prefix: "|") to use for storing beacons
+  load: ~                   # File or command (prefix: "|") to use for loading beacons  
+  interval: 3600            # How often to load and store beacons (in seconds)
+  password: ~               # Password to encrypt beacon data with
+
+statsd:                     # Statsd settings
+  server: ~                 # Statsd server name:port
+  prefix: ~                 # Prefix to use for stats keys
+
+pid-file: ~                 # Store the process id in this file when running in the background
+stats-file: ~               # Periodically write statistics on peers and current traffic to the given file
+
+hook: ~                     # Hook script to run for every event
+hooks: {}                   # Multiple hook scripts to run for specific events
+
+
+
+# Copy this template and save it to a file named /etc/vpncloud/MYNET.net (replace MYNET with your network name)
+#
+# On systems using systemd (most common):
+#    start/stop the network:            service vpncloud@MYNET start/stop
+#    enable/disable automatic startup:  systemctl enable/disable vpncloud@MYNET
+#
+# On older systems (using sysv init):
+#    Add the network name to /etc/default/vpncloud
+#    start/stop all VpnCloud networks:  /etc/init.d/vpncloud start/stop

assets/vpncloud-wsproxy.service

@@ -0,0 +1,22 @@
+[Unit]
+Description=VpnCloud websocket proxy
+After=network-online.target
+Wants=network-online.target
+Documentation=man:vpncloud(1)
+
+[Service]
+Type=simple
+ExecStart=/usr/bin/vpncloud ws-proxy -l 3210
+RestartSec=5s
+Restart=on-failure
+TasksMax=10
+MemoryMax=50M
+PrivateTmp=yes
+ProtectHome=yes
+ProtectSystem=strict
+ReadWritePaths=/var/log /run
+CapabilityBoundingSet=CAP_NET_BIND_SERVICE CAP_SYS_CHROOT
+DeviceAllow=/dev/null rw
+
+[Install]
+WantedBy=multi-user.target

assets/vpncloud.1

@@ -1,414 +0,0 @@
-.\" generated with Ronn/v0.7.3
-.\" http://github.com/rtomayko/ronn/tree/0.7.3
-.
-.TH "VPNCLOUD" "1" "February 2019" "" ""
-.
-.SH "NAME"
-\fBvpncloud\fR \- Peer\-to\-peer VPN
-.
-.SH "SYNOPSIS"
-\fBvpncloud [options] [\-\-config <file>] [\-t <type>] [\-d <name>] [\-l <addr>] [\-c <addr>\.\.\.]\fR
-.
-.SH "OPTIONS"
-.
-.TP
-\fB\-\-config <file>\fR:
-.
-.IP
-Read configuration options from the specified file\. Please see the section \fBCONFIG FILES\fR for documentation on the file format\. If the same option is defined in the config file and as a parameter, the parameter overrides the config file\.
-.
-.TP
-\fB\-t <type>\fR, \fB\-\-type <type>\fR:
-.
-.IP
-Set the type of network\. There are two options: \fBtap\fR devices process Ethernet frames \fBtun\fR devices process IP packets\. [default: \fBtap\fR]
-.
-.TP
-\fB\-d <name>\fR, \fB\-\-device <name>\fR:
-.
-.IP
-Name of the virtual device\. Any \fB%d\fR will be filled with a free number\. [default: \fBvpncloud%d\fR]
-.
-.TP
-\fB\-\-device\-path <path>\fR:
-.
-.IP
-The path of the base device inode, e\.g\. /dev/net/run\.
-.
-.TP
-\fB\-m <mode>\fR, \fB\-\-mode <mode>\fR:
-.
-.IP
-The mode of the VPN\. The VPN can like a router, a switch or a hub\. A \fBhub\fR will send all data always to all peers\. A \fBswitch\fR will learn addresses from incoming data and only send data to all peers when the address is unknown\. A \fBrouter\fR will send data according to known subnets of the peers and ignore them otherwise\. The \fBnormal\fR mode is switch for tap devices and router for tun devices\. [default: \fBnormal\fR]
-.
-.TP
-\fB\-l <port>\fR, \fB\-\-listen <port>\fR:
-.
-.IP
-The port number on which to listen for data\. [default: \fB3210\fR]
-.
-.TP
-\fB\-c <addr>\fR, \fB\-\-connect <addr>\fR:
-.
-.IP
-Address of a peer to connect to\. The address should be in the form \fBaddr:port\fR\. If the node is not started, the connection will be retried periodically\. This parameter can be repeated to connect to multiple peers\.
-.
-.TP
-\fB\-s <subnet>\fR, \fB\-\-subnet <subnet>\fR:
-.
-.IP
-The local subnets to use\. This parameter should be in the form \fBaddress/prefixlen\fR where address is an IPv4 address, an IPv6 address, or a MAC address\. The prefix length is the number of significant front bits that distinguish the subnet from other subnets\. Example: \fB10\.1\.1\.0/24\fR\.
-.
-.TP
-\fB\-\-shared\-key <key>\fR:
-.
-.IP
-An optional shared key to encrypt the VPN data\. If this option is not set, the traffic will be sent unencrypted\.
-.
-.TP
-\fB\-\-crypto <method>\fR:
-.
-.IP
-The encryption method to use ("aes256", or "chacha20")\. Most current CPUs have special support for AES256 so this should be faster\. For older computers lacking this support, only CHACHA20 is supported\. [default: \fBchacha20\fR]
-.
-.TP
-\fB\-\-magic <id>\fR:
-.
-.IP
-Override the 4\-byte magic header of each packet\. This header identifies the network and helps to distinguish it from other networks and other applications\. The id can either be a 4 byte / 8 character hexadecimal string or an arbitrary string prefixed with "hash:" which will then be hashed into 4 bytes\.
-.
-.TP
-\fB\-\-peer\-timeout <secs>\fR:
-.
-.IP
-Peer timeout in seconds\. The peers will exchange information periodically and drop peers that are silent for this period of time\. [default: \fB1800\fR]
-.
-.TP
-\fB\-\-dst\-timeout <secs>\fR:
-.
-.IP
-Switch table entry timeout in seconds\. This parameter is only used in switch mode\. Addresses that have not been seen for the given period of time will be forgotten\. [default: \fB300\fR]
-.
-.TP
-\fB\-\-ifup <command>\fR:
-.
-.IP
-A command to setup the network interface\. The command will be run (as parameter to \fBsh \-c\fR) when the device has been created to configure it\. The name of the allocated device will be available via the environment variable \fBIFNAME\fR\. Please note that this command is executed with the full permissions of the caller\.
-.
-.TP
-\fB\-\-ifdown <command>\fR:
-.
-.IP
-A command to bring down the network interface\. The command will be run (as parameter to \fBsh \-c\fR) to remove any configuration from the device\. The name of the allocated device will be available via the environment variable \fBIFNAME\fR\. Please note that this command is executed with the (limited) permissions of the user and group given as \fB\-\-user\fR and \fB\-\-group\fR\.
-.
-.TP
-\fB\-\-pid\-file <file>\fR:
-.
-.IP
-Store the process id in this file when running in the background\. If set, the given file will be created containing the process id of the new background process\. This option is only used when running in background\.
-.
-.TP
-\fB\-\-user <user>\fR:
-
-.
-.TP
-\fB\-\-group <group>\fR:
-.
-.IP
-Change the user and/or group of the process once all the setup has been done and before spawning the background process\. This option is only used when running in background\.
-.
-.TP
-\fB\-\-log\-file <file>\fR:
-.
-.IP
-If set, print logs also to the given file\. The file will be created and truncated if is exists\.
-.
-.TP
-\fB\-\-stats\-file <file>\fR:
-.
-.IP
-If set, periodically write statistics on peers and current traffic to the given file\. The file will be periodically overwritten with new data\.
-.
-.TP
-\fB\-\-daemon\fR:
-.
-.IP
-Spawn a background process instead of running the process in the foreground\. If this flag is set, the process will first carry out all the initialization, then drop permissions if \fB\-\-user\fR or \fB\-\-group\fR is used and then spawn a background process and write its process id to a file if \fB\-\-pid\-file\fR is set\. Then, the main process will exit and the background process continues to provide the VPN\. At the time, when the main process exits, the interface exists and is properly configured to be used\.
-.
-.TP
-\fB\-\-no\-port\-forwarding\fR:
-.
-.IP
-Disable automatic port forward\. If this option is not set, VpnCloud tries to detect a NAT router and automatically add a port forwarding to it\.
-.
-.TP
-\fB\-v\fR, \fB\-\-verbose\fR:
-.
-.IP
-Print debug information, including information for data being received and sent\.
-.
-.TP
-\fB\-q\fR, \fB\-\-quiet\fR:
-.
-.IP
-Only print errors and warnings\.
-.
-.TP
-\fB\-h\fR, \fB\-\-help\fR:
-.
-.IP
-Display the help\.
-.
-.SH "DESCRIPTION"
-\fBVpnCloud\fR is a simple VPN over UDP\. It creates a virtual network interface on the host and forwards all received data via UDP to the destination\. It can work in 3 different modes:
-.
-.IP "\(bu" 4
-\fBSwitch mode\fR: In this mode, the VPN will dynamically learn addresses as they are used as source addresses and use them to forward data to its destination\. Addresses that have not been seen for some time (option \fBdst_timeout\fR) will be forgotten\. Data for unknown addresses will be broadcast to all peers\. This mode is the default mode for TAP devices that process Ethernet frames but it can also be used with TUN devices and IP packets\.
-.
-.IP "\(bu" 4
-\fBHub mode\fR: In this mode, all data will always be broadcast to all peers\. This mode uses lots of bandwidth and should only be used in special cases\.
-.
-.IP "\(bu" 4
-\fBRouter mode\fR: In this mode, data will be forwarded based on preconfigured address ranges ("subnets")\. Data for unknown nodes will be silently ignored\. This mode is the default mode for TUN devices that work with IP packets but it can also be used with TAP devices and Ethernet frames\.
-.
-.IP "" 0
-.
-.P
-All connected VpnCloud nodes will form a peer\-to\-peer network and cross\-connect automatically until the network is fully connected\. The nodes will periodically exchange information with the other nodes to signal that they are still active and to allow the automatic cross\-connect behavior\. There are some important things to note:
-.
-.IP "\(bu" 4
-To avoid that different networks that reuse each others addresses merge due to the cross\-connect behavior, the \fBmagic\fR option can be used and set to any unique string to identify the network\. The \fBmagic\fR must be the same on all nodes of the same VPN network\.
-.
-.IP "\(bu" 4
-The cross\-connect behavior can be able to connect nodes that are behind firewalls or NATs as it can function as hole\-punching\.
-.
-.IP "\(bu" 4
-The management traffic will increase with the peer number quadratically\. It should still be reasonably small for high node numbers (below 10 KiB/s for 10\.000 nodes)\. A longer \fBpeer_timeout\fR can be used to reduce the traffic further\. For high node numbers, router mode should be used as it never broadcasts data\.
-.
-.IP "" 0
-.
-.P
-VpnCloud does not implement any loop\-avoidance\. Since data received on the UDP socket will only be sent to the local network interface and vice versa, VpnCloud cannot produce loops on its own\. On the TAP device, however STP data can be transported to avoid loops caused by other network components\.
-.
-.P
-For TAP devices, IEEE 802\.1q frames (VLAN tagged) are detected and forwarded based on separate MAC tables\. Any nested tags (Q\-in\-Q) will be ignored\.
-.
-.SH "EXAMPLES"
-.
-.SS "Switched TAP scenario"
-In the example scenario, a simple layer 2 network tunnel is established\. Most likely those commands need to be run as \fBroot\fR using \fBsudo\fR\.
-.
-.P
-First, VpnCloud need to be started on both nodes (the address after \fB\-c\fR is the address of the remote node and the the \fBX\fR in the interface address must be unique among all nodes, e\.g\. 0, 1, 2, \.\.\.):
-.
-.IP "" 4
-.
-.nf
-
-vpncloud \-c REMOTE_HOST:PORT \-\-ifup \'ifconfig $IFNAME 10\.0\.0\.X/24 mtu 1400 up\'
-.
-.fi
-.
-.IP "" 0
-.
-.P
-Afterwards, the interface can be used to communicate\.
-.
-.SS "Routed TUN example"
-In this example, 2 nodes and their subnets should communicate using IP\. First, VpnCloud need to be started on both nodes:
-.
-.IP "" 4
-.
-.nf
-
-vpncloud \-t tun \-c REMOTE_HOST:PORT \-\-subnet 10\.0\.X\.0/24 \-\-ifup \'ifconfig $IFNAME 10\.0\.X\.1/16 mtu 1400 up\'
-.
-.fi
-.
-.IP "" 0
-.
-.P
-It is important to configure the interface in a way that all addresses on the VPN can be reached directly\. E\.g\. if subnets 10\.0\.1\.0/24, 10\.0\.2\.0/24 and so on are used, the interface needs to be configured as 10\.0\.1\.1/16\. For TUN devices, this means that the prefix length of the subnets (/24 in this example) must be different than the prefix length that the interface is configured with (/16 in this example)\.
-.
-.SS "Important notes"
-.
-.IP "\(bu" 4
-VpnCloud can be used to connect two separate networks\. TAP networks can be bridged using \fBbrctl\fR and TUN networks must be routed\. It is very important to be careful when setting up such a scenario in order to avoid network loops, security issues, DHCP issues and many more problems\.
-.
-.IP "\(bu" 4
-TAP devices will forward DHCP data\. If done intentionally, this can be used to assign unique addresses to all participants\. If this happens accidentally, it can conflict with DHCP servers of the local network and can have severe side effects\.
-.
-.IP "\(bu" 4
-VpnCloud is not designed for high security use cases\. Although the used crypto primitives are expected to be very secure, their application has not been reviewed\. The shared key is hashed using \fIScryptSalsa208Sha256\fR to derive a key, which is used to encrypt the payload of messages using \fIChaCha20Poly1305\fR or \fIAES256\-GCM\fR\. The encryption includes an authentication that also protects the header\. This method does only protect against attacks on single messages but not against attacks that manipulate the message series itself (i\.e\. suppress messages, reorder them, or duplicate them)\.
-.
-.IP "" 0
-.
-.SH "CONFIG FILES"
-The config file is a YAML file that contains configuration values\. All entries are optional and override the defaults\. Please see the section \fBOPTIONS\fR for detailed descriptions of the options\.
-.
-.IP "\(bu" 4
-\fBdevice_type\fR: Set the type of network\. Same as \fB\-\-type\fR
-.
-.IP "\(bu" 4
-\fBdevice_name\fR: Name of the virtual device\. Same as \fB\-\-device\fR
-.
-.IP "\(bu" 4
-\fBdevice_path\fR: Set the path of the base device\. Same as \fB\-\-device\-path\fR
-.
-.IP "\(bu" 4
-\fBifup\fR: A command to setup the network interface\. Same as \fB\-\-ifup\fR
-.
-.IP "\(bu" 4
-\fBifdown\fR: A command to bring down the network interface\. Same as \fB\-\-ifdown\fR
-.
-.IP "\(bu" 4
-\fBcrypto\fR: The encryption method to use\. Same as \fB\-\-crypto\fR
-.
-.IP "\(bu" 4
-\fBshared_key\fR: The shared key to encrypt all traffic\. Same as \fB\-\-shared\-key\fR
-.
-.IP "\(bu" 4
-\fBmagic\fR: Override the 4\-byte magic header of each packet\. Same as \fB\-\-magic\fR
-.
-.IP "\(bu" 4
-\fBport\fR: The port number on which to listen for data\. Same as \fB\-\-listen\fR
-.
-.IP "\(bu" 4
-\fBpeers\fR: A list of addresses to connect to\. See \fB\-\-connect\fR
-.
-.IP "\(bu" 4
-\fBpeer_timeout\fR: Peer timeout in seconds\. Same as\fB\-\-peer\-timeout\fR
-.
-.IP "\(bu" 4
-\fBmode\fR: The mode of the VPN\. Same as \fB\-\-mode\fR
-.
-.IP "\(bu" 4
-\fBdst_timeout\fR: Switch table entry timeout in seconds\. Same as \fB\-\-dst\-timeout\fR
-.
-.IP "\(bu" 4
-\fBsubnets\fR: A list of local subnets to use\. See \fB\-\-subnet\fR
-.
-.IP "\(bu" 4
-\fBport_forwarding\fR: Whether to activate port forwardig\. See \fB\-\-no\-port\-forwarding\fR
-.
-.IP "\(bu" 4
-\fBuser\fR: The name of a user to run the background process under\. See \fB\-\-user\fR
-.
-.IP "\(bu" 4
-\fBgroup\fR: The name of a group to run the background process under\. See \fB\-\-group\fR
-.
-.IP "\(bu" 4
-\fBpid_file\fR: The path of the pid file to create\. See \fB\-\-pid\-file\fR
-.
-.IP "\(bu" 4
-\fBstats_file\fR: The path of the statistics file\. See \fB\-\-stats\-file\fR
-.
-.IP "" 0
-.
-.SS "Example"
-device_type: tun device_name: vpncloud%d ifup: ifconfig $IFNAME 10\.0\.1\.1/16 mtu 1400 up crypto: aes256 shared_key: mysecret port: 3210 peers: \- remote\.machine\.foo:3210 \- remote\.machine\.bar:3210 peer_timeout: 1800 mode: normal subnets: \- 10\.0\.1\.0/24 port_forwarding: true user: nobody group: nogroup pid_file: /run/vpncloud\.pid
-.
-.SH "NETWORK PROTOCOL"
-The protocol of VpnCloud is kept as simple as possible to allow other implementations and to maximize the performance\.
-.
-.P
-Every packet sent over UDP contains the following header (in order):
-.
-.IP "\(bu" 4
-4 bytes \fBmagic\fR
-.
-.IP
-This field is used to identify the packet and to sort out packets that do not belong\. The default is \fB[0x76, 0x70, 0x6e, 0x01]\fR ("vpn\ex01")\. This field can be used to identify VpnCloud packets and might be set to something different to hide the protocol\.
-.
-.IP "\(bu" 4
-1 byte \fBcrypto method\fR
-.
-.IP
-This field specifies the method that must be used to decrypt the rest of the data\. The currently supported methods are:
-.
-.IP "\(bu" 4
-Method \fB0\fR, \fBNo encryption\fR: Rest of the data can be read without decrypting it\.
-.
-.IP "\(bu" 4
-Method \fB1\fR, \fBChaCha20\fR: The header is followed by a 12 byte \fInonce\fR\. The rest of the data is encrypted with the \fBlibsodium::crypto_aead_chacha20poly1305_ietf\fR method, using the 8 byte header as additional data\.
-.
-.IP "\(bu" 4
-Method \fB2\fR, \fBAES256\fR: The header is followed by a 12 byte \fInonce\fR\. The rest of the data is encrypted with the \fBlibsodium::crypto_aead_aes256gcm\fR method, using the 8 byte header as additional data\.
-.
-.IP "" 0
-
-.
-.IP "\(bu" 4
-2 \fBreserved bytes\fR that are currently unused and set to 0
-.
-.IP "\(bu" 4
-1 byte for the \fBmessage type\fR
-.
-.IP
-This byte specifies the type of message that follows\. Currently the following message types are supported:
-.
-.IP "\(bu" 4
-Type 0: Data packet
-.
-.IP "\(bu" 4
-Type 1: Peer list
-.
-.IP "\(bu" 4
-Type 2: Initial message
-.
-.IP "\(bu" 4
-Type 3: Closing message
-.
-.IP "" 0
-
-.
-.IP "" 0
-.
-.P
-After this 8 byte header, the rest of the message follows\. It is encrypted using the method specified in the header\.
-.
-.P
-In the decrypted data, the message as specified in the \fBmessage type\fR field will follow:
-.
-.IP "\(bu" 4
-\fBData packet\fR (message type 0): This packet contains payload\. The format of the data depends on the device type\. For TUN devices, this data contains an IP packet\. For TAP devices it contains an Ethernet frame\. The data starts right after the header and ends at the end of the packet\. If it is an Ethernet frame, it will start with the destination MAC and end with the payload\. It does not contain the preamble, SFD, padding, and CRC fields\.
-.
-.IP "\(bu" 4
-\fBPeer list\fR (message type 1): This packet contains the peer list of the sender\. The first byte after the switch byte contains the number of IPv4 addresses that follow\. After that, the specified number of addresses follow, where each address is encoded in 6 bytes\. The first 4 bytes are the IPv4 address and the later 2 bytes are port number (both in network byte order)\. After those addresses, the next byte contains the number of IPv6 addresses that follow\. After that, the specified number of addresses follow, where each address is encoded in 18 bytes\. The first 16 bytes are the IPv6 address and the later 2 bytes are port number (both in network byte order)\.
-.
-.IP "\(bu" 4
-\fBInitial message\fR (message type 2): This packet contains the following information:
-.
-.IP "\(bu" 4
-The stage of the initialization process
-.
-.IP "\(bu" 4
-A random node id to distinguish different nodes
-.
-.IP "\(bu" 4
-All the local subnets claimed by the nodes
-.
-.IP "" 0
-.
-.IP
-Its first byte marks the stage of the initial handshake process\. The next 16 bytes contain the unique node id\. After that, the list of local subnets follows\. The subnet list is encoded in the following way: Its first byte of data contains the number of encoded subnets that follow\. After that, the given number of encoded subnets follow\. For each subnet, the first byte is the length of bytes in the base address and is followed by the given number of base address bytes and one additional byte that is the prefix length of the subnet\. The addresses for the subnet will be encoded like they are encoded in their native protocol (4 bytes for IPv4, 16 bytes for IPv6, and 6 bytes for a MAC address) with the exception of MAC addresses in a VLan which will be encoded in 8 bytes where the first 2 bytes are the VLan number in network byte order and the later 6 bytes are the MAC address\.
-.
-.IP "\(bu" 4
-\fBClosing message\fR (message type 3): This packet does not contain any more data\.
-.
-.IP "" 0
-.
-.P
-Nodes are expected to send an \fBinitial message\fR with stage 0 whenever they connect to a node they were not connected to before\. As a reply to this message, another initial should be sent with stage 1\. Also a \fBpeer list\fR message should be sent as a reply\.
-.
-.P
-When connected, nodes should periodically send their \fBpeer list\fR to all of their peers to spread this information and to avoid peer timeouts\. To avoid the cubic growth of management traffic, nodes should at a certain network size start sending partial peer lists instead of the full list\. A reasonable number would be about 20 peers\. The subsets should be selected randomly\.
-.
-.P
-Nodes should remove peers from their peer list after a certain period of inactivity or when receiving a \fBclosing message\fR\. Before shutting down, nodes should send the closing message to all of their peers in order to avoid receiving further data until the timeout is reached\.
-.
-.P
-Nodes should only add nodes to their peer list after receiving an initial message from them instead of adding them right from the peer list of another peer\. This is necessary to avoid the case of a large network keeping dead nodes alive\.
-.
-.SH "COPYRIGHT"
-Copyright (C) 2015\-2019 Dennis Schwerdel This software is licensed under GPL\-3 or newer (see LICENSE\.md)

assets/vpncloud.target

@@ -0,0 +1,2 @@
+[Unit]
+Description=VpnCloud target allowing to start/stop all vpncloud@.service instances at once

assets/vpncloud@.service

@@ -2,12 +2,25 @@
 Description=VpnCloud network '%I'
 After=network-online.target
 Wants=network-online.target
+PartOf=vpncloud.target
+Documentation=man:vpncloud(1)
 
 [Service]
 Type=forking
-ExecStart=/usr/bin/vpncloud --config /etc/vpncloud/%i.net --daemon --log-file /var/log/vpncloud-%i.log --stats-file /var/log/vpncloud-%i.stats --pid-file /run/vpncloud-%i.pid
-WorkingDirectory=/etc/vpncloud
+ExecStart=/usr/bin/vpncloud --config /etc/vpncloud/%i.net --log-file /var/log/vpncloud-%i.log --stats-file /var/log/vpncloud-%i.stats --daemon --pid-file /run/vpncloud-%i.pid
 PIDFile=/run/vpncloud-%i.pid
+WorkingDirectory=/etc/vpncloud
+RestartSec=5s
+Restart=on-failure
+TasksMax=10
+MemoryMax=50M
+PrivateTmp=yes
+ProtectHome=yes
+ProtectSystem=strict
+ReadWritePaths=/var/log /run
+CapabilityBoundingSet=CAP_NET_ADMIN CAP_NET_BIND_SERVICE CAP_NET_RAW CAP_SETGID CAP_SETUID CAP_SYS_CHROOT
+DeviceAllow=/dev/null rw
+DeviceAllow=/dev/net/tun rw
 
 [Install]
 WantedBy=multi-user.target

benches/.code.rs

@@ -0,0 +1,77 @@
+#[macro_use]
+mod util {
+    include!("../src/util.rs");
+}
+mod error {
+    include!("../src/error.rs");
+}
+mod payload {
+    include!("../src/payload.rs");
+}
+mod types {
+    include!("../src/types.rs");
+}
+mod table {
+    include!("../src/table.rs");
+}
+mod cloud {
+    include!("../src/cloud.rs");
+}
+mod config {
+    include!("../src/config.rs");
+}
+mod device {
+    include!("../src/device.rs");
+}
+mod net {
+    include!("../src/net.rs");
+}
+mod beacon {
+    include!("../src/beacon.rs");
+}
+mod messages {
+    include!("../src/messages.rs");
+}
+mod port_forwarding {
+    include!("../src/port_forwarding.rs");
+}
+mod traffic {
+    include!("../src/traffic.rs");
+}
+mod poll {
+    pub mod epoll{
+        include!("../src/poll/epoll.rs");
+    }
+    #[cfg(any(target_os = "linux", target_os = "android"))]
+    pub use self::epoll::EpollWait as WaitImpl;
+
+    use std::io;
+
+    pub enum WaitResult {
+        Timeout,
+        Socket,
+        Device,
+        Error(io::Error)
+    }
+}
+mod crypto {
+    pub mod core {
+        include!("../src/crypto/core.rs");
+    }
+    pub mod init {
+        include!("../src/crypto/init.rs");
+    }
+    pub mod rotate {
+        include!("../src/crypto/rotate.rs");
+    }
+    pub mod common {
+        include!("../src/crypto/common.rs");
+    }
+    pub use common::*;
+    pub use self::core::{EXTRA_LEN, TAG_LEN};
+}
+mod tests {
+    pub mod common {
+        include!("../src/tests/common.rs");
+    }
+}

benches/criterion.rs

@@ -0,0 +1,204 @@
+#![allow(dead_code, unused_macros, unused_imports)]
+#[macro_use] extern crate serde;
+#[macro_use] extern crate log;
+
+use criterion::{criterion_group, criterion_main, Criterion, Throughput};
+
+use smallvec::smallvec;
+use ring::aead;
+
+use std::str::FromStr;
+use std::net::{SocketAddr, Ipv4Addr, SocketAddrV4, UdpSocket};
+
+include!(".code.rs");
+
+pub use error::Error;
+use util::{MockTimeSource, MsgBuffer};
+use types::{Address, Range};
+use table::ClaimTable;
+use device::Type;
+use config::Config;
+use payload::{Packet, Frame, Protocol};
+use crypto::core::{create_dummy_pair, EXTRA_LEN};
+use tests::common::{TunSimulator, TapSimulator};
+
+fn udp_send(c: &mut Criterion) {
+    let sock = UdpSocket::bind("127.0.0.1:0").unwrap();
+    let data = [0; 1400];
+    let addr = SocketAddrV4::new(Ipv4Addr::new(127, 0, 0, 1), 1);
+    let mut g = c.benchmark_group("udp_send");
+    g.throughput(Throughput::Bytes(1400));
+    g.bench_function("udp_send", |b| {
+        b.iter(|| sock.send_to(&data, addr).unwrap());
+    });
+    g.finish();
+}
+
+fn decode_ipv4(c: &mut Criterion) {
+    let data = [0x40, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 192, 168, 1, 1, 192, 168, 1, 2];
+    let mut g = c.benchmark_group("payload");
+    g.throughput(Throughput::Bytes(1400));
+    g.bench_function("decode_ipv4", |b| {
+        b.iter(|| Packet::parse(&data).unwrap());
+    });
+    g.finish();
+}
+
+fn decode_ipv6(c: &mut Criterion) {
+    let data = [
+        0x60, 0, 0, 0, 0, 0, 0, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 0, 1, 2, 3, 4, 5, 6, 0, 9, 8, 7, 6, 5, 4, 3, 2, 1, 6, 5,
+        4, 3, 2, 1
+    ];
+    let mut g = c.benchmark_group("payload");
+    g.throughput(Throughput::Bytes(1400));
+    g.bench_function("decode_ipv6", |b| {
+        b.iter(|| Packet::parse(&data).unwrap());
+    });
+    g.finish();
+}
+
+fn decode_ethernet(c: &mut Criterion) {
+    let data = [6, 5, 4, 3, 2, 1, 1, 2, 3, 4, 5, 6, 1, 2, 3, 4, 5, 6, 7, 8];
+    let mut g = c.benchmark_group("payload");
+    g.throughput(Throughput::Bytes(1400));
+    g.bench_function("decode_ethernet", |b| {
+        b.iter(|| Frame::parse(&data).unwrap());
+    });
+    g.finish();
+}
+
+fn decode_ethernet_with_vlan(c: &mut Criterion) {
+    let data = [6, 5, 4, 3, 2, 1, 1, 2, 3, 4, 5, 6, 0x81, 0, 4, 210, 1, 2, 3, 4, 5, 6, 7, 8];
+    let mut g = c.benchmark_group("payload");
+    g.throughput(Throughput::Bytes(1400));
+    g.bench_function("decode_ethernet_with_vlan", |b| {
+        b.iter(|| Frame::parse(&data).unwrap());
+    });
+    g.finish();
+}
+
+fn lookup_warm(c: &mut Criterion) {
+    let mut table = ClaimTable::<MockTimeSource>::new(60, 60);
+    let addr = Address::from_str("1.2.3.4").unwrap();
+    table.cache(addr, SocketAddr::from_str("1.2.3.4:3210").unwrap());
+    let mut g = c.benchmark_group("table");
+    g.throughput(Throughput::Bytes(1400));
+    g.bench_function("lookup_warm", |b| {
+        b.iter(|| table.lookup(addr));
+    });
+    g.finish();
+}
+
+fn lookup_cold(c: &mut Criterion) {
+    let mut table = ClaimTable::<MockTimeSource>::new(60, 60);
+    let addr = Address::from_str("1.2.3.4").unwrap();
+    table.set_claims(SocketAddr::from_str("1.2.3.4:3210").unwrap(), smallvec![Range::from_str("1.2.3.4/32").unwrap()]);
+    let mut g = c.benchmark_group("table");
+    g.throughput(Throughput::Bytes(1400));
+    g.bench_function("lookup_cold", |b| {
+        b.iter(|| {
+            table.clear_cache();
+            table.lookup(addr)
+        });
+    });
+    g.finish();
+}
+
+fn crypto_bench(c: &mut Criterion, algo: &'static aead::Algorithm) {
+    let mut buffer = MsgBuffer::new(EXTRA_LEN);
+    buffer.set_length(1400);
+    let (mut sender, mut receiver) = create_dummy_pair(algo);
+    let mut g = c.benchmark_group("crypto");
+    g.throughput(Throughput::Bytes(2*1400));
+    g.bench_function(format!("{:?}", algo), |b| {
+        b.iter(|| {
+            sender.encrypt(&mut buffer);
+            receiver.decrypt(&mut buffer).unwrap();
+        });
+    });
+    g.finish()
+}
+
+fn crypto_chacha20(c: &mut Criterion) {
+    crypto_bench(c, &aead::CHACHA20_POLY1305)
+}
+
+fn crypto_aes128(c: &mut Criterion) {
+    crypto_bench(c, &aead::AES_128_GCM)
+}
+
+fn crypto_aes256(c: &mut Criterion) {
+    crypto_bench(c, &aead::AES_256_GCM)
+}
+
+fn full_communication_tun_router(c: &mut Criterion) {
+    log::set_max_level(log::LevelFilter::Error);
+    let config1 = Config {
+        device_type: Type::Tun,
+        auto_claim: false,
+        claims: vec!["1.1.1.1/32".to_string()],
+        ..Config::default()
+    };
+    let config2 = Config {
+        device_type: Type::Tun,
+        auto_claim: false,
+        claims: vec!["2.2.2.2/32".to_string()],
+        ..Config::default()
+    };
+    let mut sim = TunSimulator::new();
+    let node1 = sim.add_node(false, &config1);
+    let node2 = sim.add_node(false, &config2);
+
+    sim.connect(node1, node2);
+    sim.simulate_all_messages();
+    assert!(sim.is_connected(node1, node2));
+    assert!(sim.is_connected(node2, node1));
+
+    let mut payload = vec![0x40, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 2, 2, 2, 2];
+    payload.append(&mut vec![0; 1400]);
+    let mut g = c.benchmark_group("full_communication");
+    g.throughput(Throughput::Bytes(2*1400));
+    g.bench_function("tun_router", |b| {
+        b.iter(|| {
+            sim.put_payload(node1, payload.clone());
+            sim.simulate_all_messages();
+            assert_eq!(Some(&payload), sim.pop_payload(node2).as_ref());
+        });
+    });
+    g.finish()
+}
+
+fn full_communication_tap_switch(c: &mut Criterion) {
+    log::set_max_level(log::LevelFilter::Error);    
+    let config = Config { device_type: Type::Tap, ..Config::default() };
+    let mut sim = TapSimulator::new();
+    let node1 = sim.add_node(false, &config);
+    let node2 = sim.add_node(false, &config);
+
+    sim.connect(node1, node2);
+    sim.simulate_all_messages();
+    assert!(sim.is_connected(node1, node2));
+    assert!(sim.is_connected(node2, node1));
+
+    let mut payload = vec![2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 2, 3, 4, 5];
+    payload.append(&mut vec![0; 1400]);
+    let mut g = c.benchmark_group("full_communication");
+    g.throughput(Throughput::Bytes(2*1400));
+    g.bench_function("tap_switch", |b| {
+        b.iter(|| {
+            sim.put_payload(node1, payload.clone());
+            sim.simulate_all_messages();
+            assert_eq!(Some(&payload), sim.pop_payload(node2).as_ref());
+        });
+    });
+    g.finish()
+}
+
+criterion_group!(benches, 
+    udp_send, 
+    decode_ipv4, decode_ipv6, decode_ethernet, decode_ethernet_with_vlan, 
+    lookup_cold, lookup_warm, 
+    crypto_chacha20, crypto_aes128, crypto_aes256,
+    full_communication_tun_router, full_communication_tap_switch
+);
+criterion_main!(benches);

benches/valgrind.rs

@@ -0,0 +1,155 @@
+#![allow(dead_code, unused_macros, unused_imports)]
+#[macro_use] extern crate serde;
+#[macro_use] extern crate log;
+
+use iai::{black_box, main};
+
+use smallvec::smallvec;
+use ring::aead;
+
+use std::str::FromStr;
+use std::net::{SocketAddr, Ipv4Addr, SocketAddrV4, UdpSocket};
+
+include!(".code.rs");
+
+pub use error::Error;
+use util::{MockTimeSource, MsgBuffer};
+use config::Config;
+use types::{Address, Range};
+use device::Type;
+use table::ClaimTable;
+use payload::{Packet, Frame, Protocol};
+use crypto::core::{create_dummy_pair, EXTRA_LEN};
+use tests::common::{TunSimulator, TapSimulator};
+
+fn udp_send() {
+    let sock = UdpSocket::bind("127.0.0.1:0").unwrap();
+    let data = [0; 1400];
+    let addr = SocketAddrV4::new(Ipv4Addr::new(127, 0, 0, 1), 1);
+    sock.send_to(&data, black_box(addr)).unwrap();
+}
+
+fn decode_ipv4() {
+    let data = [0x40, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 192, 168, 1, 1, 192, 168, 1, 2];
+    Packet::parse(&black_box(data)).unwrap();
+}
+
+fn decode_ipv6() {
+    let data = [
+        0x60, 0, 0, 0, 0, 0, 0, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 0, 1, 2, 3, 4, 5, 6, 0, 9, 8, 7, 6, 5, 4, 3, 2, 1, 6, 5,
+        4, 3, 2, 1
+    ];
+    Packet::parse(&black_box(data)).unwrap();
+}
+
+fn decode_ethernet() {
+    let data = [6, 5, 4, 3, 2, 1, 1, 2, 3, 4, 5, 6, 1, 2, 3, 4, 5, 6, 7, 8];
+    Frame::parse(&black_box(data)).unwrap();
+}
+
+fn decode_ethernet_with_vlan() {
+    let data = [6, 5, 4, 3, 2, 1, 1, 2, 3, 4, 5, 6, 0x81, 0, 4, 210, 1, 2, 3, 4, 5, 6, 7, 8];
+    Frame::parse(&black_box(data)).unwrap();
+}
+
+fn lookup_warm() {
+    let mut table = ClaimTable::<MockTimeSource>::new(60, 60);
+    let addr = Address::from_str("1.2.3.4").unwrap();
+    table.cache(addr, SocketAddr::from_str("1.2.3.4:3210").unwrap());
+    for _ in 0..1000 {
+        table.lookup(black_box(addr));
+    }
+}
+
+fn lookup_cold() {
+    let mut table = ClaimTable::<MockTimeSource>::new(60, 60);
+    let addr = Address::from_str("1.2.3.4").unwrap();
+    table.set_claims(SocketAddr::from_str("1.2.3.4:3210").unwrap(), smallvec![Range::from_str("1.2.3.4/32").unwrap()]);
+    for _ in 0..1000 {
+        table.clear_cache();
+        table.lookup(black_box(addr));
+    }
+}
+
+fn crypto_bench(algo: &'static aead::Algorithm) {
+    let mut buffer = MsgBuffer::new(EXTRA_LEN);
+    buffer.set_length(1400);
+    let (mut sender, mut receiver) = create_dummy_pair(algo);
+    for _ in 0..1000 {
+        sender.encrypt(black_box(&mut buffer));
+        receiver.decrypt(&mut buffer).unwrap();
+    }
+}
+
+fn crypto_chacha20() {
+    crypto_bench(&aead::CHACHA20_POLY1305)
+}
+
+fn crypto_aes128() {
+    crypto_bench(&aead::AES_128_GCM)
+}
+
+fn crypto_aes256() {
+    crypto_bench(&aead::AES_256_GCM)
+}
+
+fn full_communication_tun_router() {
+    log::set_max_level(log::LevelFilter::Error);
+    let config1 = Config {
+        device_type: Type::Tun,
+        auto_claim: false,
+        claims: vec!["1.1.1.1/32".to_string()],
+        ..Config::default()
+    };
+    let config2 = Config {
+        device_type: Type::Tun,
+        auto_claim: false,
+        claims: vec!["2.2.2.2/32".to_string()],
+        ..Config::default()
+    };
+    let mut sim = TunSimulator::new();
+    let node1 = sim.add_node(false, &config1);
+    let node2 = sim.add_node(false, &config2);
+
+    sim.connect(node1, node2);
+    sim.simulate_all_messages();
+    assert!(sim.is_connected(node1, node2));
+    assert!(sim.is_connected(node2, node1));
+
+    let mut payload = vec![0x40, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 2, 2, 2, 2];
+    payload.append(&mut vec![0; 1400]);
+    for _ in 0..1000 {
+        sim.put_payload(node1, payload.clone());
+        sim.simulate_all_messages();
+        assert_eq!(Some(&payload), black_box(sim.pop_payload(node2).as_ref()));
+    }
+}
+
+fn full_communication_tap_switch() {
+    log::set_max_level(log::LevelFilter::Error);
+    let config = Config { device_type: Type::Tap, ..Config::default() };
+    let mut sim = TapSimulator::new();
+    let node1 = sim.add_node(false, &config);
+    let node2 = sim.add_node(false, &config);
+
+    sim.connect(node1, node2);
+    sim.simulate_all_messages();
+    assert!(sim.is_connected(node1, node2));
+    assert!(sim.is_connected(node2, node1));
+
+    let mut payload = vec![2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 2, 3, 4, 5];
+    payload.append(&mut vec![0; 1400]);
+    for _ in 0..1000 {
+        sim.put_payload(node1, payload.clone());
+        sim.simulate_all_messages();
+        assert_eq!(Some(&payload), black_box(sim.pop_payload(node2).as_ref()));
+    }
+}
+
+iai::main!(
+    udp_send, 
+    decode_ipv4, decode_ipv6, decode_ethernet, decode_ethernet_with_vlan, 
+    lookup_cold, lookup_warm, 
+    crypto_chacha20, crypto_aes128, crypto_aes256,
+    full_communication_tun_router, full_communication_tap_switch
+);

build.rs

@@ -1,32 +0,0 @@
-// VpnCloud - Peer-to-Peer VPN
-// Copyright (C) 2015-2019  Dennis Schwerdel
-// This software is licensed under GPL-3 or newer (see LICENSE.md)
-
-extern crate cc;
-
-use std::process::Command;
-use std::env;
-use std::path::Path;
-use std::fs;
-
-fn main() {
-    let out_dir = env::var("OUT_DIR").unwrap();
-
-    // Compile tun/tap C code
-    println!("cargo:rerun-if-changed=src/c/tuntap.c");
-    cc::Build::new().file("src/c/tuntap.c").include("src").compile("libtuntap.a");
-
-    // Process manpage using ronn command
-    println!("cargo:rerun-if-changed=vpncloud.md");
-    fs::copy("vpncloud.md", Path::new(&out_dir).join("vpncloud.1.ronn")).unwrap();
-    match Command::new("ronn").args(&["-r", "vpncloud.1.ronn"]).current_dir(&Path::new(&out_dir)).status() {
-        Ok(_) => {
-            Command::new("gzip").args(&["vpncloud.1"]).current_dir(&Path::new(&out_dir)).status().unwrap();
-            fs::copy(Path::new(&out_dir).join("vpncloud.1.gz"), "target/vpncloud.1.gz").unwrap();
-        }, 
-        Err(err) => {
-            println!("cargo:warning=Error building manpage: {}", err);
-            println!("cargo:warning=The manpage will not be build. Do you have 'ronn'?");
-        }
-    }
-}

builder/.dockerignore

@@ -1,2 +0,0 @@
-cache
-build.sh

builder/Dockerfile-deb

@@ -1,27 +0,0 @@
-FROM debian:stable
-
-RUN apt-get update \
- && apt-get install -y --no-install-recommends \
-    curl ruby-ronn build-essential gcc-arm-linux-gnueabihf libc6-dev-armhf-cross \
- && rm -rf /var/cache/dpkg
-
-RUN useradd -ms /bin/bash user
-USER user
-WORKDIR /home/user
-
-ENV RUST=1.39.0
-
-RUN curl https://sh.rustup.rs -sSf | sh -s -- -y --default-toolchain ${RUST}
-
-ENV PATH=/home/user/.cargo/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
-
-RUN rustup target add i686-unknown-linux-gnu \
- && rustup target add armv7-unknown-linux-gnueabihf
-
-RUN cargo install cargo-deb \
- && rm -rf /home/user/.cargo/{git,tmp,registry}
-
-VOLUME /home/user/.cargo/tmp
-VOLUME /home/user/.cargo/git
-VOLUME /home/user/.cargo/registry
-

builder/Dockerfile-rpm

@@ -1,24 +0,0 @@
-FROM centos:latest
-
-RUN yum groupinstall -y 'Development Tools'
-
-RUN useradd -ms /bin/bash user
-USER user
-WORKDIR /home/user
-
-ENV RUST=1.39.0
-
-RUN curl https://sh.rustup.rs -sSf | sh -s -- -y --default-toolchain ${RUST}
-
-ENV PATH=/home/user/.cargo/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
-
-RUN rustup target add i686-unknown-linux-gnu \
- && rustup target add armv7-unknown-linux-gnueabihf
-
-RUN cargo install cargo-rpm \
- && rm -rf /home/user/.cargo/{git,tmp,registry}
-
-VOLUME /home/user/.cargo/tmp
-VOLUME /home/user/.cargo/git
-VOLUME /home/user/.cargo/registry
-

builder/build.sh

@@ -1,39 +0,0 @@
-#!/bin/bash
-
-function docker_cmd() {
-  DIST=$1
-  CMD=$2
-  docker run -it --rm -v $(pwd)/..:/home/user/code \
-    -v $CACHE/registry:/home/user/.cargo/registry \
-    -v $CACHE/git:/home/user/.cargo/git \
-    -v $CACHE/tmp:/home/user/.cargo/tmp \
-    vpncloud-builder-$DIST bash -c "$CMD"
-}
-
-set -e
-
-cd $(dirname $0)
-
-VERSION=$(grep -e '^version =' ../Cargo.toml | sed -e 's/version = "\(.*\)"/\1/')
-
-mkdir -p cache/{git,tmp,registry}
-CACHE=$(pwd)/cache
-
-mkdir -p ../dist
-
-docker build --rm -f=Dockerfile-deb -t vpncloud-builder-deb .
-
-# x86_64 deb
-docker_cmd deb 'cd code && cargo deb'
-cp ../target/debian/vpncloud_${VERSION}_amd64.deb ../dist/vpncloud_${VERSION}_amd64.deb
-
-# arm7hf deb
-docker_cmd deb 'cd code && cargo deb --target armv7-unknown-linux-gnueabihf'
-cp ../target/armv7-unknown-linux-gnueabihf/debian/vpncloud_${VERSION}_armhf.deb ../dist/vpncloud_${VERSION}_armhf.deb
-
-
-docker build --rm -f=Dockerfile-rpm -t vpncloud-builder-rpm .
-
-# x86_64 rpm
-docker_cmd rpm 'cd code && cargo rpm build'
-cp ../target/release/rpmbuild/RPMS/x86_64/vpncloud-${VERSION}-1.x86_64.rpm ../dist/vpncloud_${VERSION}.x86_64.rpm

contrib/asciinema-recorder/Dockerfile

@@ -0,0 +1,13 @@
+FROM ubuntu
+
+RUN apt-get update && apt-get install -y asciinema locales bash iputils-ping
+RUN sed -i '/en_US.UTF-8/s/^# //g' /etc/locale.gen && locale-gen
+ENV LANG en_US.UTF-8  
+ENV LANGUAGE en_US:en  
+ENV LC_ALL en_US.UTF-8
+RUN mkdir /root/.asciinema
+RUN mkdir /etc/vpncloud
+
+WORKDIR /data
+ADD config /root/.asciinema/config
+RUN echo 'PS1="\[\e[00;34m\]\[\e[01;31m\]\u\[\e[00;01;34m\]@\[\e[00;34m\]node\[\e[01;31m\]:\[\e[00;34m\]\w\[\e[01;31m\]> \[\e[00m\]"' >> /root/.bashrc

contrib/asciinema-recorder/config

@@ -0,0 +1,3 @@
+[record]
+command = bash -l
+idle_time_limit = 2.5

contrib/asciinema-recorder/recorder.sh

@@ -0,0 +1,11 @@
+#!/bin/bash
+
+set -e
+
+cd $(dirname $0)
+
+docker build -t asciinema-recorder .
+docker run -it --rm --network host \
+  -v $(pwd):/data \
+  -v /etc/hosts:/etc/hosts \
+  asciinema-recorder

contrib/aws/WSProxyCloudFormation.yaml

@@ -0,0 +1,81 @@
+AWSTemplateFormatVersion: 2010-09-09
+Description: |
+  VpnCloud Websocket Proxy
+  This will configure a websocket proxy to be used with VpnCloud.
+  Versions: Ubuntu Server 20.04 LTS + VpnCloud 2.1.0
+Parameters:
+  LatestAmiId:
+    Description: "Image to use (just leave this as it is)"
+    Type: 'AWS::SSM::Parameter::Value<AWS::EC2::Image::Id>'
+    Default: '/aws/service/canonical/ubuntu/server/20.04/stable/current/arm64/hvm/ebs-gp2/ami-id'
+    AllowedValues:
+      - '/aws/service/canonical/ubuntu/server/20.04/stable/current/arm64/hvm/ebs-gp2/ami-id'
+Resources:
+  ProxySecurityGroup:
+    Type: 'AWS::EC2::SecurityGroup'
+    Properties:
+      GroupDescription: Enable HTTP access via port 80 and any UDP port
+      SecurityGroupIngress:
+        - IpProtocol: tcp
+          FromPort: '80'
+          ToPort: '80'
+          CidrIp: 0.0.0.0/0
+        - IpProtocol: udp
+          FromPort: '1024'
+          ToPort: '65535'
+          CidrIp: 0.0.0.0/0
+  LaunchTemplate:
+    Type: AWS::EC2::LaunchTemplate
+    DependsOn:
+      - ProxySecurityGroup 
+    Properties:
+      LaunchTemplateData:
+        ImageId: !Ref LatestAmiId
+        SecurityGroups:
+          - !Ref ProxySecurityGroup
+        InstanceMarketOptions:
+          MarketType: spot
+        InstanceType: t4g.nano
+        TagSpecifications:
+          - ResourceType: instance
+            Tags:
+            - Key: Name
+              Value: VpnCloud WS Proxy
+        CreditSpecification:
+          CpuCredits: standard
+        BlockDeviceMappings:
+        - DeviceName: /dev/sda1
+          Ebs:
+            VolumeType: standard
+            VolumeSize: '8'
+            DeleteOnTermination: 'true'
+            Encrypted: 'false'
+        UserData:
+          Fn::Base64: !Sub |
+            #cloud-config
+            packages:
+            - iperf3
+            - socat
+            runcmd:
+            - wget https://github.com/dswd/vpncloud/releases/download/v2.1.0/vpncloud_2.1.0_arm64.deb -O /tmp/vpncloud.deb
+            - dpkg -i /tmp/vpncloud.deb
+            - nohup vpncloud ws-proxy -l 80 &
+  ProxyInstance:
+    Type: 'AWS::EC2::Instance'
+    DependsOn:
+      - LaunchTemplate
+    Properties:
+      LaunchTemplate:
+        LaunchTemplateId:
+          Ref: LaunchTemplate
+        Version: 1
+Outputs:
+  ProxyURL:
+    Description: URL to use in VpnCloud config
+    Value: !Join 
+      - ''
+      - - 'ws://'
+        - !GetAtt 
+          - ProxyInstance
+          - PublicDnsName
+        - ':80'

contrib/aws/common.py

@@ -0,0 +1,384 @@
+import boto3
+import atexit
+import paramiko
+import io
+import time
+import threading
+import re
+import json
+import base64
+import sys
+import os
+from datetime import date
+
+MAX_WAIT = 300
+CREATE = "***CREATE***"
+
+def eprint(*args, **kwargs):
+    print(*args, file=sys.stderr, **kwargs)
+
+def run_cmd(connection, cmd):
+    _stdin, stdout, stderr = connection.exec_command(cmd)
+    out = stdout.read().decode('utf-8')
+    err = stderr.read().decode('utf-8')
+    code = stdout.channel.recv_exit_status()
+    if code:
+        raise Exception("Command failed", code, out, err)
+    else:
+        return out, err
+
+def upload(connection, local, remote):
+    ftp_client=connection.open_sftp()
+    ftp_client.put(local, remote)
+    ftp_client.close()
+
+class SpotInstanceRequest:
+    def __init__(self, id):
+        self.id = id
+    def __str__(self):
+        return str(self.id)
+
+
+class Node:
+    def __init__(self, instance, connection):
+        self.instance = instance
+        self.connection = connection
+        self.private_ip = instance.private_ip_address
+        self.public_ip = instance.public_ip_address
+
+    def run_cmd(self, cmd):
+        return run_cmd(self.connection, cmd)
+
+    def start_vpncloud(self, ip=None, crypto=None, password="test", device_type="tun", listen="3210", mode="normal", peers=[], claims=[]):
+        args = [
+            "--daemon", 
+            "--no-port-forwarding", 
+            "-t {}".format(device_type),
+            "-m {}".format(mode),
+            "-l {}".format(listen),
+            "--password '{}'".format(password)
+        ]
+        if ip:
+            args.append("--ip {}".format(ip))
+        if crypto:
+            args.append("--algo {}".format(crypto))
+        for p in peers:
+            args.append("-c {}".format(p))
+        for c in claims:
+            args.append("--claim {}".format(c))
+        args = " ".join(args)
+        self.run_cmd("sudo vpncloud {}".format(args))
+
+    def stop_vpncloud(self, wait=True):
+        self.run_cmd("sudo killall vpncloud")
+        if wait:
+            time.sleep(3.0)
+
+    def ping(self, dst, size=100, count=10, interval=0.001):
+        (out, _) = self.run_cmd('sudo ping {dst} -c {count} -i {interval} -s {size} -U -q'.format(dst=dst, size=size, count=count, interval=interval))
+        match = re.search(r'([\d]*\.[\d]*)/([\d]*\.[\d]*)/([\d]*\.[\d]*)/([\d]*\.[\d]*)', out)
+        ping_min = float(match.group(1))
+        ping_avg = float(match.group(2))
+        ping_max = float(match.group(3))
+        match = re.search(r'(\d*)% packet loss', out)
+        pkt_loss = float(match.group(1))
+        return {
+            "rtt_min": ping_min,
+            "rtt_max": ping_max,
+            "rtt_avg": ping_avg,
+            "pkt_loss": pkt_loss
+        }
+
+    def start_iperf_server(self):
+        self.run_cmd('iperf3 -s -D')
+        time.sleep(0.1)
+
+    def stop_iperf_server(self):
+        self.run_cmd('killall iperf3')
+
+    def run_iperf(self, dst, duration):
+        (out, _) = self.run_cmd('iperf3 -c {dst} -t {duration} --json'.format(dst=dst, duration=duration))
+        data = json.loads(out)
+        return {
+            "throughput": data['end']['streams'][0]['receiver']['bits_per_second'],
+            "cpu_sender": data['end']['cpu_utilization_percent']['host_total'],
+            "cpu_receiver": data['end']['cpu_utilization_percent']['remote_total']
+        }
+    
+
+def find_ami(region, owner, name_pattern, arch='x86_64'):
+    ec2client = boto3.client('ec2', region_name=region)
+    response = ec2client.describe_images(Owners=[owner], Filters=[
+        {'Name': 'name', 'Values': [name_pattern]}, 
+        {'Name': 'architecture', 'Values': ['x86_64']}
+    ])
+    try:
+        image = max(response['Images'], key=lambda i: i['CreationDate'])
+        return image['ImageId']
+    except ValueError:
+        return None
+
+
+class EC2Environment:
+    def __init__(self, vpncloud_version, region, node_count, instance_type, vpncloud_file=None, use_spot=True, max_price=0.1, ami=('amazon', 'al2023-ami-*-hvm-*'), username="ec2-user", subnet=CREATE, keyname=CREATE, privatekey=CREATE, tag="vpncloud", cluster_nodes=False):
+        self.region = region
+        self.node_count = node_count
+        self.instance_type = instance_type
+        self.use_spot = use_spot
+        self.max_price = str(max_price)
+        if isinstance(ami, tuple):
+            owner, name = ami
+            self.ami = find_ami(region, owner, name)
+            assert self.ami
+        else:
+            self.ami = ami
+        self.username = username
+        self.vpncloud_version = vpncloud_version
+        self.vpncloud_file = vpncloud_file
+        self.cluster_nodes = cluster_nodes
+        self.resources = []
+        self.instances = []
+        self.connections = []
+        self.nodes = []
+        self.subnet = subnet
+        self.tag = tag
+        self.keyname = keyname
+        self.privatekey = privatekey
+        self.rsa_key = None
+        try:
+            eprint("Setting up resources...")
+            self.setup()
+            self.wait_until_ready()
+            for i in range(0, self.node_count):
+                self.nodes.append(Node(self.instances[i], self.connections[i]))
+            eprint("Setup done")
+            atexit.register(lambda : self.terminate())
+            eprint()
+        except:
+            eprint("Error, shutting down")
+            self.terminate()
+            raise
+
+    def track_resource(self, res):
+        self.resources.append(res)
+        eprint("\t{} {}".format(res.__class__.__name__, res.id if hasattr(res, "id") else ""))
+        if hasattr(res, "create_tags") and not hasattr(res, "name"):
+            res.create_tags(Tags=[{"Key": "Name", "Value": self.tag}])
+
+    def setup_vpc(self):
+        ec2 = boto3.resource('ec2', region_name=self.region)
+        ec2client = boto3.client('ec2', region_name=self.region)
+
+        vpc = ec2.create_vpc(CidrBlock='172.16.0.0/16')
+        self.track_resource(vpc)
+        vpc.wait_until_available()
+        ec2client.modify_vpc_attribute(VpcId=vpc.id, EnableDnsSupport={'Value': True})
+        ec2client.modify_vpc_attribute(VpcId=vpc.id, EnableDnsHostnames={'Value': True})
+
+        igw = ec2.create_internet_gateway()
+        self.track_resource(igw)
+        igw.attach_to_vpc(VpcId=vpc.id)
+
+        rtb = vpc.create_route_table()
+        self.track_resource(rtb)
+        rtb.create_route(DestinationCidrBlock='0.0.0.0/0', GatewayId=igw.id)
+
+        subnet = ec2.create_subnet(CidrBlock='172.16.1.0/24', VpcId=vpc.id)
+        self.track_resource(subnet)
+        rtb.associate_with_subnet(SubnetId=subnet.id)
+
+        self.subnet = subnet.id
+
+
+    def setup(self):
+        ec2 = boto3.resource('ec2', region_name=self.region)
+        ec2client = boto3.client('ec2', region_name=self.region)
+
+        if self.subnet == CREATE:
+            self.setup_vpc()
+        else:
+            eprint("\tUsing subnet {}".format(self.subnet))
+
+        vpc = ec2.Subnet(self.subnet).vpc
+
+        sg = ec2.create_security_group(GroupName='SSH-ONLY', Description='only allow SSH traffic', VpcId=vpc.id)
+        self.track_resource(sg)
+        sg.authorize_ingress(CidrIp='0.0.0.0/0', IpProtocol='tcp', FromPort=22, ToPort=22)
+        sg.authorize_ingress(CidrIp='172.16.1.0/24', IpProtocol='icmp', FromPort=-1, ToPort=-1)
+        sg.authorize_ingress(CidrIp='172.16.1.0/24', IpProtocol='tcp', FromPort=0, ToPort=65535)
+        sg.authorize_ingress(CidrIp='172.16.1.0/24', IpProtocol='udp', FromPort=0, ToPort=65535)
+
+        if self.keyname == CREATE:
+            key_pair = ec2.create_key_pair(KeyName="{}-keypair".format(self.tag))
+            self.track_resource(key_pair)
+            self.keyname = key_pair.name
+            self.privatekey = key_pair.key_material
+        self.rsa_key = paramiko.RSAKey.from_private_key(io.StringIO(self.privatekey))
+
+        placement = {}
+        if self.cluster_nodes:
+            placement_group = ec2.create_placement_group(GroupName="{}-placement".format(self.tag), Strategy="cluster")
+            self.track_resource(placement_group)
+            placement = { 'GroupName': placement_group.name }
+        
+        userdata = """#cloud-config
+packages:
+  - iperf3
+  - socat
+"""
+        if not self.vpncloud_file:
+            userdata += """
+runcmd:
+  - wget https://github.com/dswd/vpncloud/releases/download/v{version}/vpncloud_{version}.x86_64.rpm -O /tmp/vpncloud.rpm
+  - yum install -y /tmp/vpncloud.rpm
+""".format(version=self.vpncloud_version)
+        
+        if self.use_spot:
+            response = ec2client.request_spot_instances(
+                SpotPrice = self.max_price,
+                Type = "one-time",
+                InstanceCount = self.node_count,
+                LaunchSpecification = {
+                    "ImageId": self.ami,
+                    "InstanceType": self.instance_type,
+                    "KeyName": key_pair.name,
+                    "UserData": base64.b64encode(userdata.encode("ascii")).decode('ascii'),
+                    "BlockDeviceMappings": [
+                        {
+                            "DeviceName": "/dev/xvda",
+                            "Ebs": {
+                                "DeleteOnTermination": True,
+                                "VolumeType": "gp2",
+                            }
+                        }
+                    ],
+                    "NetworkInterfaces": [
+                        {
+                            'SubnetId': self.subnet,
+                            'DeviceIndex': 0,
+                            'AssociatePublicIpAddress': True,
+                            'Groups': [sg.group_id]
+                        }
+                    ],
+                    "Placement": placement
+                }
+            )
+            requests = []
+            for req in response['SpotInstanceRequests']:
+                request = SpotInstanceRequest(req['SpotInstanceRequestId'])
+                self.track_resource(request)
+                requests.append(request)
+            eprint("Waiting for spot instance requests")
+            waited = 0
+            self.instances = [None] * len(requests)
+            while waited < MAX_WAIT:
+                time.sleep(1.0)
+                for i, req in enumerate(requests):
+                    response = ec2client.describe_spot_instance_requests(SpotInstanceRequestIds=[req.id])
+                    data = response['SpotInstanceRequests'][0]
+                    if 'InstanceId' in data:
+                        self.instances[i] = ec2.Instance(data['InstanceId'])
+                        self.track_resource(self.instances[i])
+                if min(map(bool, self.instances)):
+                    break
+            if waited >= MAX_WAIT:
+                raise Exception("Waited too long")
+        else:
+            self.instances = ec2.create_instances(
+                ImageId=self.ami,
+                InstanceType=self.instance_type,
+                MaxCount=self.node_count,
+                MinCount=self.node_count,
+                NetworkInterfaces=[
+                    {
+                        'SubnetId': self.subnet,
+                        'DeviceIndex': 0,
+                        'AssociatePublicIpAddress': True,
+                        'Groups': [sg.group_id]
+                    }
+                ],
+                Placement=placement,
+                UserData=userdata,
+                KeyName=key_pair.name
+            )
+            for instance in self.instances:
+                self.track_resource(instance)
+
+    def wait_until_ready(self):
+        waited = 0
+        eprint("Waiting for instances to start...")
+        for instance in self.instances:
+            instance.wait_until_running()
+            instance.reload()
+        eprint("Waiting for SSH to be ready...")
+        self.connections = [None] * len(self.instances)
+        while waited < MAX_WAIT:
+            for i, instance in enumerate(self.instances):
+                if self.connections[i]:
+                    continue
+                try:
+                    self.connections[i] = self._connect(instance)
+                except:
+                    pass
+            if min(map(bool, self.connections)):
+                break
+            time.sleep(1.0)
+            waited += 1
+        eprint("Waiting for instances to finish setup...")
+        ready = [False] * len(self.connections)
+        while waited < MAX_WAIT:
+            for i, con in enumerate(self.connections):
+                if ready[i]:
+                    continue
+                try:
+                    run_cmd(con, 'test -f /var/lib/cloud/instance/boot-finished')
+                    ready[i] = True
+                except:
+                    pass
+            if min(map(bool, ready)):
+                break
+            time.sleep(1.0)
+            waited += 1
+        if waited >= MAX_WAIT:
+            raise Exception("Waited too long")
+        if self.vpncloud_file:
+            eprint("Uploading vpncloud binary")
+            for con in self.connections:
+                upload(con, self.vpncloud_file, 'vpncloud')
+                run_cmd(con, 'chmod +x vpncloud')
+                run_cmd(con, 'sudo mv vpncloud /usr/bin/vpncloud')
+
+
+    def terminate(self):
+        if not self.resources:
+            return
+        eprint("Closing connections...")
+        for con in self.connections:
+            if con:
+                con.close()
+        self.connections = []
+        eprint("Terminating instances...")
+        for instance in self.instances:
+            instance.terminate()
+        for instance in self.instances:
+            eprint("\t{}".format(instance.id))
+            instance.wait_until_terminated()
+        self.instances = []
+        eprint("Deleting resources...")
+        ec2client = boto3.client('ec2', region_name=self.region)
+        for res in reversed(self.resources):
+            eprint("\t{} {}".format(res.__class__.__name__, res.id if hasattr(res, "id") else ""))
+            if isinstance(res, SpotInstanceRequest):
+                ec2client.cancel_spot_instance_requests(SpotInstanceRequestIds=[res.id])
+            if hasattr(res, "attachments"):
+                for a in res.attachments:
+                    res.detach_from_vpc(VpcId=a['VpcId'])
+            if hasattr(res, "delete"):
+                res.delete()
+        self.resources = []
+
+    def _connect(self, instance):
+        client = paramiko.SSHClient()
+        client.set_missing_host_key_policy(paramiko.AutoAddPolicy())
+        client.connect(hostname=instance.public_dns_name, username=self.username, pkey=self.rsa_key, timeout=1.0, banner_timeout=1.0)
+        return client

contrib/aws/example.py

@@ -0,0 +1,23 @@
+#!/usr/bin/env python3
+
+from common import EC2Environment, CREATE
+import time
+
+setup = EC2Environment(
+    region = "eu-central-1", 
+    node_count = 2, 
+    instance_type = 't3a.nano', 
+    vpncloud_version = "2.1.0"
+)
+
+sender = setup.nodes[0]
+receiver = setup.nodes[1]
+
+sender.start_vpncloud(ip="10.0.0.1/24")
+receiver.start_vpncloud(ip="10.0.0.2/24", peers=["{}:3210".format(sender.private_ip)])
+time.sleep(1.0)
+
+sender.ping("10.0.0.2")
+
+sender.stop_vpncloud()
+receiver.stop_vpncloud()

contrib/aws/measurements/2020-06-08_1.0.0_perf.json

@@ -0,0 +1,134 @@
+{
+  "meta": {
+    "region": "eu-central-1",
+    "instance_type": "m5.large",
+    "ami": "ami-0a02ee601d742e89f",
+    "version": "1.0.0",
+    "duration": 495.34057664871216
+  },
+  "native": {
+    "iperf": {
+      "throughput": 9680305000.0,
+      "cpu_sender": 20.862659,
+      "cpu_receiver": 65.856166
+    },
+    "ping_100": {
+      "rtt_min": 0.035,
+      "rtt_max": 0.121,
+      "rtt_avg": 0.04,
+      "pkt_loss": 0.0
+    },
+    "ping_500": {
+      "rtt_min": 0.036,
+      "rtt_max": 0.151,
+      "rtt_avg": 0.042,
+      "pkt_loss": 0.0
+    },
+    "ping_1000": {
+      "rtt_min": 0.039,
+      "rtt_max": 0.145,
+      "rtt_avg": 0.043,
+      "pkt_loss": 0.0
+    }
+  },
+  "plain": {
+    "iperf": {
+      "throughput": 4836527000.0,
+      "cpu_sender": 9.380104,
+      "cpu_receiver": 65.333537
+    },
+    "ping_100": {
+      "rtt_min": 0.06,
+      "rtt_max": 0.165,
+      "rtt_avg": 0.074,
+      "pkt_loss": 0.0
+    },
+    "ping_500": {
+      "rtt_min": 0.063,
+      "rtt_max": 0.389,
+      "rtt_avg": 0.076,
+      "pkt_loss": 0.0
+    },
+    "ping_1000": {
+      "rtt_min": 0.066,
+      "rtt_max": 0.185,
+      "rtt_avg": 0.077,
+      "pkt_loss": 0.0
+    }
+  },
+  "aes256": {
+    "iperf": {
+      "throughput": 3312712000.0,
+      "cpu_sender": 7.639525,
+      "cpu_receiver": 54.563243
+    },
+    "ping_100": {
+      "rtt_min": 0.062,
+      "rtt_max": 1.352,
+      "rtt_avg": 0.075,
+      "pkt_loss": 0.0
+    },
+    "ping_500": {
+      "rtt_min": 0.064,
+      "rtt_max": 0.163,
+      "rtt_avg": 0.077,
+      "pkt_loss": 0.0
+    },
+    "ping_1000": {
+      "rtt_min": 0.067,
+      "rtt_max": 0.334,
+      "rtt_avg": 0.079,
+      "pkt_loss": 0.0
+    }
+  },
+  "chacha20": {
+    "iperf": {
+      "throughput": 2418750000.0,
+      "cpu_sender": 4.331642,
+      "cpu_receiver": 49.452792
+    },
+    "ping_100": {
+      "rtt_min": 0.065,
+      "rtt_max": 0.182,
+      "rtt_avg": 0.08,
+      "pkt_loss": 0.0
+    },
+    "ping_500": {
+      "rtt_min": 0.072,
+      "rtt_max": 0.201,
+      "rtt_avg": 0.086,
+      "pkt_loss": 0.0
+    },
+    "ping_1000": {
+      "rtt_min": 0.075,
+      "rtt_max": 0.38,
+      "rtt_avg": 0.09,
+      "pkt_loss": 0.0
+    }
+  },
+  "results": {
+    "throughput_mbits": {
+      "native": 9680.305,
+      "plain": 4836.527,
+      "aes256": 3312.712,
+      "chacha20": 2418.75
+    },
+    "latency_us": {
+      "plain": {
+        "100": 16.999999999999996,
+        "500": 16.999999999999996,
+        "1000": 17.0
+      },
+      "aes256": {
+        "100": 17.499999999999996,
+        "500": 17.499999999999996,
+        "1000": 18.000000000000004
+      },
+      "chacha20": {
+        "100": 20.0,
+        "500": 21.999999999999996,
+        "1000": 23.5
+      }
+    }
+  }
+}

contrib/aws/measurements/2020-06-08_1.1.0_perf.json

@@ -0,0 +1,134 @@
+{
+  "meta": {
+    "region": "eu-central-1",
+    "instance_type": "m5.large",
+    "ami": "ami-0a02ee601d742e89f",
+    "version": "1.1.0",
+    "duration": 495.3976471424103
+  },
+  "native": {
+    "iperf": {
+      "throughput": 9672876000.0,
+      "cpu_sender": 21.627575,
+      "cpu_receiver": 68.637173
+    },
+    "ping_100": {
+      "rtt_min": 0.049,
+      "rtt_max": 0.869,
+      "rtt_avg": 0.057,
+      "pkt_loss": 0.0
+    },
+    "ping_500": {
+      "rtt_min": 0.051,
+      "rtt_max": 13.136,
+      "rtt_avg": 0.059,
+      "pkt_loss": 0.0
+    },
+    "ping_1000": {
+      "rtt_min": 0.054,
+      "rtt_max": 0.179,
+      "rtt_avg": 0.06,
+      "pkt_loss": 0.0
+    }
+  },
+  "plain": {
+    "iperf": {
+      "throughput": 4983797000.0,
+      "cpu_sender": 11.27702,
+      "cpu_receiver": 65.580003
+    },
+    "ping_100": {
+      "rtt_min": 0.077,
+      "rtt_max": 0.24,
+      "rtt_avg": 0.093,
+      "pkt_loss": 0.0
+    },
+    "ping_500": {
+      "rtt_min": 0.078,
+      "rtt_max": 13.188,
+      "rtt_avg": 0.096,
+      "pkt_loss": 0.0
+    },
+    "ping_1000": {
+      "rtt_min": 0.083,
+      "rtt_max": 0.223,
+      "rtt_avg": 0.097,
+      "pkt_loss": 0.0
+    }
+  },
+  "aes256": {
+    "iperf": {
+      "throughput": 3226869000.0,
+      "cpu_sender": 5.683309,
+      "cpu_receiver": 54.09244
+    },
+    "ping_100": {
+      "rtt_min": 0.077,
+      "rtt_max": 1.533,
+      "rtt_avg": 0.095,
+      "pkt_loss": 0.0
+    },
+    "ping_500": {
+      "rtt_min": 0.082,
+      "rtt_max": 13.21,
+      "rtt_avg": 0.098,
+      "pkt_loss": 0.0
+    },
+    "ping_1000": {
+      "rtt_min": 0.084,
+      "rtt_max": 0.249,
+      "rtt_avg": 0.099,
+      "pkt_loss": 0.0
+    }
+  },
+  "chacha20": {
+    "iperf": {
+      "throughput": 2740356000.0,
+      "cpu_sender": 7.041418,
+      "cpu_receiver": 56.705647
+    },
+    "ping_100": {
+      "rtt_min": 0.081,
+      "rtt_max": 0.299,
+      "rtt_avg": 0.096,
+      "pkt_loss": 0.0
+    },
+    "ping_500": {
+      "rtt_min": 0.087,
+      "rtt_max": 13.089,
+      "rtt_avg": 0.104,
+      "pkt_loss": 0.0
+    },
+    "ping_1000": {
+      "rtt_min": 0.092,
+      "rtt_max": 0.36,
+      "rtt_avg": 0.108,
+      "pkt_loss": 0.0
+    }
+  },
+  "results": {
+    "throughput_mbits": {
+      "native": 9672.876,
+      "plain": 4983.797,
+      "aes256": 3226.869,
+      "chacha20": 2740.356
+    },
+    "latency_us": {
+      "plain": {
+        "100": 18.0,
+        "500": 18.500000000000004,
+        "1000": 18.500000000000004
+      },
+      "aes256": {
+        "100": 19.0,
+        "500": 19.500000000000004,
+        "1000": 19.500000000000004
+      },
+      "chacha20": {
+        "100": 19.5,
+        "500": 22.5,
+        "1000": 24.0
+      }
+    }
+  }
+}

contrib/aws/measurements/2020-06-08_1.2.0_perf.json

@@ -0,0 +1,134 @@
+{
+  "meta": {
+    "region": "eu-central-1",
+    "instance_type": "m5.large",
+    "ami": "ami-0a02ee601d742e89f",
+    "version": "1.2.0",
+    "duration": 495.3082287311554
+  },
+  "native": {
+    "iperf": {
+      "throughput": 9679928000.0,
+      "cpu_sender": 14.518989,
+      "cpu_receiver": 75.510689
+    },
+    "ping_100": {
+      "rtt_min": 0.044,
+      "rtt_max": 0.212,
+      "rtt_avg": 0.052,
+      "pkt_loss": 0.0
+    },
+    "ping_500": {
+      "rtt_min": 0.049,
+      "rtt_max": 0.368,
+      "rtt_avg": 0.053,
+      "pkt_loss": 0.0
+    },
+    "ping_1000": {
+      "rtt_min": 0.049,
+      "rtt_max": 0.422,
+      "rtt_avg": 0.055,
+      "pkt_loss": 0.0
+    }
+  },
+  "plain": {
+    "iperf": {
+      "throughput": 5670752000.0,
+      "cpu_sender": 15.711913,
+      "cpu_receiver": 69.661585
+    },
+    "ping_100": {
+      "rtt_min": 0.076,
+      "rtt_max": 0.298,
+      "rtt_avg": 0.092,
+      "pkt_loss": 0.0
+    },
+    "ping_500": {
+      "rtt_min": 0.079,
+      "rtt_max": 0.269,
+      "rtt_avg": 0.094,
+      "pkt_loss": 0.0
+    },
+    "ping_1000": {
+      "rtt_min": 0.079,
+      "rtt_max": 0.469,
+      "rtt_avg": 0.095,
+      "pkt_loss": 0.0
+    }
+  },
+  "aes256": {
+    "iperf": {
+      "throughput": 3531058000.0,
+      "cpu_sender": 5.652232,
+      "cpu_receiver": 58.238361
+    },
+    "ping_100": {
+      "rtt_min": 0.08,
+      "rtt_max": 0.849,
+      "rtt_avg": 0.095,
+      "pkt_loss": 0.0
+    },
+    "ping_500": {
+      "rtt_min": 0.08,
+      "rtt_max": 0.205,
+      "rtt_avg": 0.096,
+      "pkt_loss": 0.0
+    },
+    "ping_1000": {
+      "rtt_min": 0.083,
+      "rtt_max": 0.418,
+      "rtt_avg": 0.099,
+      "pkt_loss": 0.0
+    }
+  },
+  "chacha20": {
+    "iperf": {
+      "throughput": 2384829000.0,
+      "cpu_sender": 3.995289,
+      "cpu_receiver": 47.656852
+    },
+    "ping_100": {
+      "rtt_min": 0.08,
+      "rtt_max": 0.2,
+      "rtt_avg": 0.096,
+      "pkt_loss": 0.0
+    },
+    "ping_500": {
+      "rtt_min": 0.087,
+      "rtt_max": 0.223,
+      "rtt_avg": 0.102,
+      "pkt_loss": 0.0
+    },
+    "ping_1000": {
+      "rtt_min": 0.092,
+      "rtt_max": 0.416,
+      "rtt_avg": 0.109,
+      "pkt_loss": 0.0
+    }
+  },
+  "results": {
+    "throughput_mbits": {
+      "native": 9679.928,
+      "plain": 5670.752,
+      "aes256": 3531.058,
+      "chacha20": 2384.829
+    },
+    "latency_us": {
+      "plain": {
+        "100": 20.0,
+        "500": 20.5,
+        "1000": 20.0
+      },
+      "aes256": {
+        "100": 21.5,
+        "500": 21.5,
+        "1000": 22.000000000000004
+      },
+      "chacha20": {
+        "100": 22.000000000000004,
+        "500": 24.499999999999996,
+        "1000": 27.0
+      }
+    }
+  }
+}

contrib/aws/measurements/2020-06-08_1.3.0_perf.json

@@ -0,0 +1,134 @@
+{
+  "meta": {
+    "region": "eu-central-1",
+    "instance_type": "m5.large",
+    "ami": "ami-0a02ee601d742e89f",
+    "version": "1.3.0",
+    "duration": 495.4212408065796
+  },
+  "native": {
+    "iperf": {
+      "throughput": 9673825000.0,
+      "cpu_sender": 14.002781,
+      "cpu_receiver": 74.93156
+    },
+    "ping_100": {
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+  },
+  "results": {
+    "throughput_mbits": {
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+      "plain": 5335.762,
+      "aes256": 3488.22,
+      "chacha20": 2784.941
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+    "latency_us": {
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+      "chacha20": {
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+        "500": 25.0,
+        "1000": 27.499999999999996
+      }
+    }
+  }
+}

contrib/aws/measurements/2020-06-08_1.4.0_perf.json

@@ -0,0 +1,134 @@
+{
+  "meta": {
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+    "instance_type": "m5.large",
+    "ami": "ami-0a02ee601d742e89f",
+    "version": "1.4.0",
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+  },
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+      "plain": 4991.32,
+      "aes256": 3824.049,
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+      "chacha20": {
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+        "1000": 26.999999999999996
+      }
+    }
+  }
+}

contrib/aws/measurements/2020-10-28_2.0.0_perf.json

@@ -0,0 +1,165 @@
+{
+  "meta": {
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+    "instance_type": "m5.large",
+    "ami": "ami-00a205cb8e06c3c4e",
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+        "500": 25.5,
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+    }
+  }
+}

contrib/aws/measurements/2021-02-06_2.1.0_perf.json

@@ -0,0 +1,165 @@
+{
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+    "instance_type": "m5.large",
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+        "500": 23.999999999999996,
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+      }
+    }
+  }
+}

contrib/aws/measurements/2021-04-06_2.2.0_perf.json

@@ -0,0 +1,165 @@
+{
+  "meta": {
+    "region": "eu-central-1",
+    "instance_type": "m5.large",
+    "ami": "ami-0db9040eb3ab74509",
+    "version": "2.2.0",
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+  },
+  "results": {
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+      "aes256": 3917.767,
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+        "500": 18.500000000000004,
+        "1000": 18.500000000000004
+      },
+      "aes256": {
+        "100": 19.5,
+        "500": 20.500000000000004,
+        "1000": 21.5
+      },
+      "aes128": {
+        "100": 19.5,
+        "500": 21.5,
+        "1000": 20.999999999999996
+      },
+      "chacha20": {
+        "100": 20.0,
+        "500": 22.0,
+        "1000": 23.0
+      }
+    }
+  }
+}

contrib/aws/measurements/2021-12-23_2.3.0_perf.json

@@ -0,0 +1,165 @@
+{
+  "meta": {
+    "region": "eu-central-1",
+    "instance_type": "m5.large",
+    "ami": "ami-099ccc441b2ef41ec",
+    "version": "2.3.0",
+    "duration": 622.5463161468506
+  },
+  "native": {
+    "iperf": {
+      "throughput": 9529265000.0,
+      "cpu_sender": 11.32918,
+      "cpu_receiver": 61.870429
+    },
+    "ping_100": {
+      "rtt_min": 0.046,
+      "rtt_max": 0.225,
+      "rtt_avg": 0.053,
+      "pkt_loss": 0.0
+    },
+    "ping_500": {
+      "rtt_min": 0.047,
+      "rtt_max": 10.98,
+      "rtt_avg": 0.054,
+      "pkt_loss": 0.0
+    },
+    "ping_1000": {
+      "rtt_min": 0.048,
+      "rtt_max": 0.175,
+      "rtt_avg": 0.056,
+      "pkt_loss": 0.0
+    }
+  },
+  "plain": {
+    "iperf": {
+      "throughput": 6388312000.0,
+      "cpu_sender": 16.955082,
+      "cpu_receiver": 72.705695
+    },
+    "ping_100": {
+      "rtt_min": 0.076,
+      "rtt_max": 11.973,
+      "rtt_avg": 0.09,
+      "pkt_loss": 0.0
+    },
+    "ping_500": {
+      "rtt_min": 0.08,
+      "rtt_max": 10.95,
+      "rtt_avg": 0.094,
+      "pkt_loss": 0.0
+    },
+    "ping_1000": {
+      "rtt_min": 0.081,
+      "rtt_max": 1.638,
+      "rtt_avg": 0.095,
+      "pkt_loss": 0.0
+    }
+  },
+  "aes256": {
+    "iperf": {
+      "throughput": 3801851000.0,
+      "cpu_sender": 5.826756,
+      "cpu_receiver": 61.612033
+    },
+    "ping_100": {
+      "rtt_min": 0.075,
+      "rtt_max": 0.9,
+      "rtt_avg": 0.093,
+      "pkt_loss": 0.0
+    },
+    "ping_500": {
+      "rtt_min": 0.079,
+      "rtt_max": 0.275,
+      "rtt_avg": 0.091,
+      "pkt_loss": 0.0
+    },
+    "ping_1000": {
+      "rtt_min": 0.08,
+      "rtt_max": 1.015,
+      "rtt_avg": 0.093,
+      "pkt_loss": 0.0
+    }
+  },
+  "aes128": {
+    "iperf": {
+      "throughput": 3880325000.0,
+      "cpu_sender": 6.219277,
+      "cpu_receiver": 62.125445
+    },
+    "ping_100": {
+      "rtt_min": 0.077,
+      "rtt_max": 11.656,
+      "rtt_avg": 0.09,
+      "pkt_loss": 0.0
+    },
+    "ping_500": {
+      "rtt_min": 0.08,
+      "rtt_max": 0.211,
+      "rtt_avg": 0.095,
+      "pkt_loss": 0.0
+    },
+    "ping_1000": {
+      "rtt_min": 0.082,
+      "rtt_max": 1.398,
+      "rtt_avg": 0.095,
+      "pkt_loss": 0.0
+    }
+  },
+  "chacha20": {
+    "iperf": {
+      "throughput": 3126447000.0,
+      "cpu_sender": 5.113819,
+      "cpu_receiver": 58.58095
+    },
+    "ping_100": {
+      "rtt_min": 0.079,
+      "rtt_max": 0.271,
+      "rtt_avg": 0.091,
+      "pkt_loss": 0.0
+    },
+    "ping_500": {
+      "rtt_min": 0.083,
+      "rtt_max": 0.272,
+      "rtt_avg": 0.098,
+      "pkt_loss": 0.0
+    },
+    "ping_1000": {
+      "rtt_min": 0.087,
+      "rtt_max": 1.615,
+      "rtt_avg": 0.101,
+      "pkt_loss": 0.0
+    }
+  },
+  "results": {
+    "throughput_mbits": {
+      "native": 9529.265,
+      "plain": 6388.312,
+      "aes256": 3801.851,
+      "aes128": 3880.325,
+      "chacha20": 3126.447
+    },
+    "latency_us": {
+      "plain": {
+        "100": 18.5,
+        "500": 20.0,
+        "1000": 19.5
+      },
+      "aes256": {
+        "100": 20.0,
+        "500": 18.5,
+        "1000": 18.5
+      },
+      "aes128": {
+        "100": 18.5,
+        "500": 20.5,
+        "1000": 19.5
+      },
+      "chacha20": {
+        "100": 19.0,
+        "500": 22.000000000000004,
+        "1000": 22.500000000000004
+      }
+    }
+  }
+}

contrib/aws/performance.py

@@ -0,0 +1,116 @@
+#!/usr/bin/env python3
+
+from common import EC2Environment, CREATE, eprint
+import time, json
+from datetime import date
+
+
+# Note: this script will run for ~8 minutes and incur costs of about $ 0.02
+
+FILE = "../../target/release/vpncloud"
+VERSION = "2.4.0"
+REGION = "eu-central-1"
+
+env = EC2Environment(
+    region = REGION, 
+    node_count = 2, 
+    instance_type = "m5.large", 
+    use_spot = False, 
+    max_price = "0.08", # USD per hour per VM
+    vpncloud_version = VERSION,
+    vpncloud_file = FILE,
+    cluster_nodes = True,
+    subnet = CREATE, 
+    keyname = CREATE
+)
+
+
+CRYPTO = ["plain", "aes256", "aes128", "chacha20"]
+
+
+class PerfTest:
+    def __init__(self, sender, receiver, meta):
+        self.sender = sender
+        self.receiver = receiver
+        self.sender_ip_vpncloud = "10.0.0.1"
+        self.receiver_ip_vpncloud = "10.0.0.2"
+        self.meta = meta
+
+    @classmethod
+    def from_ec2_env(cls, env):
+        meta = {
+            "region": env.region,
+            "instance_type": env.instance_type,
+            "ami": env.ami,
+            "version": env.vpncloud_version
+        }
+        return cls(env.nodes[0], env.nodes[1], meta)
+
+    def run_ping(self, dst, size):
+        eprint("\tRunning ping {} with size {} ...".format(dst, size))
+        return self.sender.ping(dst=dst, size=size, count=30000, interval=0.001)
+
+    def run_iperf(self, dst):
+        eprint("\tRunning iperf on {} ...".format(dst))
+        self.receiver.start_iperf_server()
+        time.sleep(0.1)
+        result = self.sender.run_iperf(dst=dst, duration=30)
+        self.receiver.stop_iperf_server()
+        return result
+
+    def run_suite(self, dst):
+        return {
+            "iperf": self.run_iperf(dst),
+            "ping_100": self.run_ping(dst, 100),
+            "ping_500": self.run_ping(dst, 500),
+            "ping_1000": self.run_ping(dst, 1000),
+        }
+
+    def start_vpncloud(self, crypto=None):
+        eprint("\tSetting up vpncloud on receiver")
+        self.receiver.start_vpncloud(crypto=crypto, ip="{}/24".format(self.receiver_ip_vpncloud))
+        eprint("\tSetting up vpncloud on sender")
+        self.sender.start_vpncloud(crypto=crypto, peers=["{}:3210".format(self.receiver.private_ip)], ip="{}/24".format(self.sender_ip_vpncloud))
+        time.sleep(1.0)
+
+    def stop_vpncloud(self):
+        self.sender.stop_vpncloud(wait=False)
+        self.receiver.stop_vpncloud(wait=True)
+
+    def run(self):
+        eprint("Testing native network")
+        results = {
+            "meta": self.meta,
+            "native": self.run_suite(self.receiver.private_ip)
+        }
+        for crypto in CRYPTO:
+            eprint("Running with crypto {}".format(crypto))
+            self.start_vpncloud(crypto=crypto)
+            res = self.run_suite(self.receiver_ip_vpncloud)
+            self.stop_vpncloud()
+            results[str(crypto)] = res
+        results['results'] = {
+            "throughput_mbits": dict([
+                (k, results[k]["iperf"]["throughput"] / 1000000.0) for k in ["native"] + CRYPTO
+            ]),
+            "latency_us": dict([
+                (k, dict([
+                    (str(s), (results[k]["ping_%s" % s]["rtt_avg"] - results["native"]["ping_%s" % s]["rtt_avg"])*1000.0/2.0) for s in [100, 500, 1000]
+                ])) for k in CRYPTO
+            ])
+        }
+        return results
+
+perf = PerfTest.from_ec2_env(env)
+
+start = time.time()
+results = perf.run()
+duration = time.time() - start
+
+results["meta"]["duration"] = duration
+
+name = "measurements/{date}_{version}_perf.json".format(date=date.today().strftime('%Y-%m-%d'), version=VERSION)
+eprint('Storing results in {}'.format(name))
+with open(name, 'w') as fp:
+    json.dump(results, fp, indent=2)
+eprint("done.")

contrib/aws/testnet.py

@@ -0,0 +1,61 @@
+#!/usr/bin/env python3
+
+from common import EC2Environment, CREATE
+import atexit, argparse, os
+
+REGION = "eu-central-1"
+
+VERSION = "2.1.0"
+
+
+parser = argparse.ArgumentParser(description='Create a test setup')
+parser.add_argument('--instancetype', default='t3a.nano', help='EC2 instance type')
+parser.add_argument('--version', default=VERSION, help='VpnCloud version to use')
+parser.add_argument('--count', '-c', dest="count", type=int, default=2, help='Number of instance to create')
+parser.add_argument('--cluster', action="store_true", help='Cluster instances to get reliable throughput')
+parser.add_argument('--subnet', help='AWS subnet id to use (empty = create new one)')
+parser.add_argument('--keyname', help='Name of AWS keypair to use (empty = create new one)')
+parser.add_argument('--keyfile', default="key.pem", help='Path of the private key file')
+
+
+args = parser.parse_args()
+
+privatekey = None
+if args.keyname:
+    with open(args.keyfile, 'r') as fp:
+        privatekey = fp.read()
+
+opts = {}
+if os.path.exists(args.version):
+    opts["vpncloud_file"] = args.version
+    opts["vpncloud_version"] = None
+else:
+    opts["vpncloud_version"] = args.version
+
+setup = EC2Environment(
+    region = REGION, 
+    node_count = args.count, 
+    instance_type = args.instancetype, 
+    cluster_nodes = args.cluster,
+    subnet = args.subnet or CREATE, 
+    keyname = args.keyname or CREATE,
+    privatekey = privatekey,
+    **opts
+)
+
+if not args.keyname:
+    assert not os.path.exists(args.keyfile)
+    with open(args.keyfile, 'x') as fp:
+        fp.write(setup.privatekey)
+    os.chmod(args.keyfile, 0o400)
+    print("SSH private key written to {}".format(args.keyfile))
+    atexit.register(lambda : os.remove(args.keyfile))
+    print()
+
+print("Nodes:")
+for node in setup.nodes:
+    print("\t {}@{}\tprivate: {}".format(setup.username, node.public_ip, node.private_ip))
+print()
+
+print("Press ENTER to shut down")
+input()

maskfile.md

@@ -0,0 +1,209 @@
+# Commands
+
+Needs [mask](https://github.com/jacobdeichert/mask) to run.
+
+
+## install-tools
+
+> Install tools.
+
+```sh
+set -e
+apt-get install -y asciidoctor
+cargo install cargo-binstall
+cargo binstall cross cargo-deb cargo-generate-rpm
+UPX_VERSION=$(grep -e '^upx_version =' Cargo.toml | sed -e 's/upx_version = "\(.*\)"/\1/')
+curl https://github.com/upx/upx/releases/download/v${UPX_VERSION}/upx-${UPX_VERSION}-amd64_linux.tar.xz -Lf | tar -xJ --strip-components=1 -C /usr/local/bin
+```
+
+## manpage
+
+> Generate manpage.
+
+```sh
+set -e
+echo >&2 "Generating manpage"
+if [ ! -f target/vpncloud.1.gz -o vpncloud.adoc -nt target/vpncloud.1.gz ]; then
+  asciidoctor -b manpage -o target/vpncloud.1 vpncloud.adoc
+  gzip -f target/vpncloud.1
+fi
+```
+
+## build-packages-cross (target) (target_name) (target_name_rpm)
+
+> Build the project packages for a given target.
+
+```sh
+set -e
+VERSION=$(grep -e '^version =' Cargo.toml | sed -e 's/version = "\(.*\)"/\1/')
+TARGET=$target
+TARGET_DIR=target/$target_name
+
+# compile
+echo >&2 "Compiling for $target_name"
+cross build --release --target $TARGET --target-dir $TARGET_DIR
+mkdir -p target/$TARGET/release
+cp $TARGET_DIR/$TARGET/release/vpncloud target/$TARGET/release/
+
+# build deb
+echo >&2 "Building deb package"
+cargo deb --no-build --no-strip --target $TARGET
+mv target/$TARGET/debian/vpncloud_${VERSION}-1_$target_name.deb dist/vpncloud_${VERSION}_$target_name.deb
+
+# build rpm
+if [ -n "$target_name_rpm" ]; then
+  echo >&2 "Building rpm package"
+  cargo generate-rpm --target $TARGET --target-dir $TARGET_DIR
+  mv $TARGET_DIR/$TARGET/generate-rpm/vpncloud-${VERSION}-1.$target_name_rpm.rpm dist/vpncloud_${VERSION}-1.$target_name_rpm.rpm
+fi
+```
+
+## build-amd64-packages
+
+```sh
+$MASK build-packages-cross x86_64-unknown-linux-gnu amd64 x86_64
+```
+
+## build-i386-packages
+
+```sh
+$MASK build-packages-cross i686-unknown-linux-gnu i386 i686
+```
+
+## build-arm64-packages
+
+```sh
+$MASK build-packages-cross aarch64-unknown-linux-gnu arm64 aarch64
+```
+
+## build-armhf-packages
+
+```sh
+$MASK build-packages-cross armv7-unknown-linux-gnueabihf armhf ""
+```
+
+## build-armel-packages
+
+```sh
+$MASK build-packages-cross armv5te-unknown-linux-gnueabi armel ""
+```
+
+
+
+## build-static-cross (target) (target_name)
+
+> Build the project statically for a given target.
+
+```sh
+set -e
+VERSION=$(grep -e '^version =' Cargo.toml | sed -e 's/version = "\(.*\)"/\1/')
+TARGET=$target
+TARGET_DIR=target/$target_name-musl
+BIN=$TARGET_DIR/$TARGET/release/vpncloud
+
+echo >&2 "Compiling for $target_name musl"
+cross build --release --features installer --target $TARGET --target-dir $TARGET_DIR
+upx --lzma $BIN
+cp $BIN dist/vpncloud_${VERSION}_static_$target_name
+```
+
+## build-amd64-static
+
+```sh
+$MASK build-static-cross x86_64-unknown-linux-musl amd64
+```
+
+
+## build-i386-static
+
+```sh
+$MASK build-static-cross i686-unknown-linux-musl i386
+```
+
+
+## build-arm64-static
+
+```sh
+$MASK build-static-cross aarch64-unknown-linux-musl arm64
+```
+
+## build-armhf-static
+
+```sh
+$MASK build-static-cross armv7-unknown-linux-musleabihf armhf
+```
+
+## build-armel-static
+
+```sh
+$MASK build-static-cross armv5te-unknown-linux-musleabi armel
+```
+
+
+## build
+
+> Build the project for all architectures.
+
+```sh
+set -e
+$MASK manpage
+$MASK build-amd64-packages
+$MASK build-amd64-static
+$MASK build-i386-packages
+$MASK build-i386-static
+$MASK build-arm64-packages
+$MASK build-arm64-static
+$MASK build-armhf-packages
+$MASK build-armhf-static
+$MASK build-armel-packages
+$MASK build-armel-static
+```
+
+## sign
+
+> Sign the packages.
+
+```sh
+set -e
+VERSION=$(grep -e '^version =' Cargo.toml | sed -e 's/version = "\(.*\)"/\1/')
+cd dist
+sha256sum vpncloud_${VERSION}_static_* vpncloud_${VERSION}*.rpm vpncloud_${VERSION}*.deb  > vpncloud_${VERSION}_SHA256SUMS.txt
+gpg --armor --output vpncloud_${VERSION}_SHA256SUMS.txt.asc --detach-sig vpncloud_${VERSION}_SHA256SUMS.txt
+```
+
+## test
+
+> Test the project.
+
+```sh
+cargo test --all-features
+```
+
+## release
+
+> Release the project.
+
+```sh
+set -e
+
+$MASK test
+nano Cargo.toml
+VERSION=$(grep -e '^version =' Cargo.toml | sed -e 's/version = "\(.*\)"/\1/')
+nano CHANGELOG.md
+nano assets/changelog.txt
+$MASK build
+$MASK sign
+git commit -a
+cargo publish
+git tag v$VERSION
+git push --tags
+```
+
+
+## count
+
+> Count the lines of code.
+
+```sh
+tokei
+```

perf.sh

@@ -1,21 +0,0 @@
-#!/bin/bash
-
-DST=$1
-
-echo
-echo "----------"
-echo "Throughput"
-echo "----------"
-for i in 0 1 2; do
-  iperf -c $DST -t 30
-done
-
-for size in 100 500 1000; do
-  echo
-  echo "--------------------"
-  echo "Latency ($size Bytes)"
-  echo "--------------------"
-  for i in 0 1 2 3 4; do
-    ping $DST -c 30000 -i 0.001 -s $size -U -q
-  done
-done

rustfmt.toml

@@ -15,3 +15,5 @@ overflow_delimited_expr = true
 blank_lines_upper_bound = 2
 normalize_doc_attributes = true
 inline_attribute_width = 50
+edition = "2018"
+reorder_impl_items = true

src/beacon.rs

@@ -1,5 +1,5 @@
 // VpnCloud - Peer-to-Peer VPN
-// Copyright (C) 2019-2019  Dennis Schwerdel
+// Copyright (C) 2015-2021  Dennis Schwerdel
 // This software is licensed under GPL-3 or newer (see LICENSE.md)
 
 use ring::digest;
@@ -15,15 +15,15 @@ use std::{
     process::{Command, Stdio},
     sync::{
         atomic::{AtomicBool, Ordering},
-        Arc, Mutex
+        Arc, Mutex,
     },
-    thread
+    thread,
 };
 
 use super::util::{from_base62, to_base62, Encoder, TimeSource};
+use smallvec::SmallVec;
 use std::net::{Ipv4Addr, Ipv6Addr, SocketAddr, SocketAddrV4, SocketAddrV6};
 
-
 const TYPE_BEGIN: u8 = 0;
 const TYPE_END: u8 = 1;
 const TYPE_DATA: u8 = 2;
@@ -33,30 +33,28 @@ fn base_62_sanitize(data: &str) -> String {
     data.chars().filter(|c| c.is_ascii_alphanumeric()).collect()
 }
 
-fn sha512(data: &[u8]) -> Vec<u8> {
-    digest::digest(&digest::SHA512, data).as_ref().to_vec()
+fn sha512(data: &[u8]) -> SmallVec<[u8; 64]> {
+    digest::digest(&digest::SHA512, data).as_ref().into()
 }
 
 struct FutureResult<T> {
     has_result: AtomicBool,
-    result: Mutex<T>
+    result: Mutex<T>,
 }
 
 #[derive(Clone)]
 pub struct BeaconSerializer<TS> {
-    magic: Vec<u8>,
     shared_key: Vec<u8>,
     future_peers: Arc<FutureResult<Vec<SocketAddr>>>,
-    _dummy_ts: PhantomData<TS>
+    _dummy_ts: PhantomData<TS>,
 }
 
 impl<TS: TimeSource> BeaconSerializer<TS> {
-    pub fn new(magic: &[u8], shared_key: &[u8]) -> Self {
+    pub fn new(shared_key: &[u8]) -> Self {
         Self {
-            magic: magic.to_owned(),
             shared_key: shared_key.to_owned(),
             future_peers: Arc::new(FutureResult { has_result: AtomicBool::new(false), result: Mutex::new(Vec::new()) }),
-            _dummy_ts: PhantomData
+            _dummy_ts: PhantomData,
         }
     }
 
@@ -64,10 +62,9 @@ impl<TS: TimeSource> BeaconSerializer<TS> {
         ((TS::now() / 3600) & 0xffff) as u16
     }
 
-    fn get_keystream(&self, type_: u8, seed: u8, iter: u8) -> Vec<u8> {
-        let mut data = Vec::new();
+    fn get_keystream(&self, type_: u8, seed: u8, iter: u8) -> SmallVec<[u8; 64]> {
+        let mut data = SmallVec::<[u8; 128]>::new();
         data.extend_from_slice(&[type_, seed, iter]);
-        data.extend_from_slice(&self.magic);
         data.extend_from_slice(&self.shared_key);
         sha512(&data)
     }
@@ -95,6 +92,7 @@ impl<TS: TimeSource> BeaconSerializer<TS> {
     fn end(&self) -> String {
         to_base62(&self.get_keystream(TYPE_END, 0, 0))[0..5].to_string()
     }
+
     fn encrypt_data(&self, data: &mut Vec<u8>) {
         // Note: the 1 byte seed is only meant to protect from random changes,
         // not malicious ones. For full protection, at least 8 bytes (~12
@@ -106,7 +104,7 @@ impl<TS: TimeSource> BeaconSerializer<TS> {
 
     fn decrypt_data(&self, data: &mut Vec<u8>) -> bool {
         if data.is_empty() {
-            return false
+            return false;
         }
         let seed = data.pop().unwrap() ^ self.get_keystream(TYPE_SEED, 0, 0)[0];
         self.mask_with_keystream(data as &mut [u8], TYPE_DATA, seed);
@@ -118,12 +116,12 @@ impl<TS: TimeSource> BeaconSerializer<TS> {
         // Add timestamp
         data.extend_from_slice(&Self::now_hour_16().to_be_bytes());
         // Split addresses into v4 and v6
-        let mut v4addrs = Vec::new();
-        let mut v6addrs = Vec::new();
+        let mut v4addrs = SmallVec::<[SocketAddrV4; 256]>::new();
+        let mut v6addrs = SmallVec::<[SocketAddrV6; 256]>::new();
         for p in peers {
             match *p {
                 SocketAddr::V4(addr) => v4addrs.push(addr),
-                SocketAddr::V6(addr) => v6addrs.push(addr)
+                SocketAddr::V6(addr) => v6addrs.push(addr),
             }
         }
         // Add count of v4 addresses
@@ -159,23 +157,23 @@ impl<TS: TimeSource> BeaconSerializer<TS> {
         let mut peers = Vec::new();
         let mut pos = 0;
         if data.len() < 4 {
-            return peers
+            return peers;
         }
         if !self.decrypt_data(&mut data) {
-            return peers
+            return peers;
         }
         let then = Wrapping(Encoder::read_u16(&data[pos..=pos + 1]));
         if let Some(ttl) = ttl_hours {
             let now = Wrapping(Self::now_hour_16());
             if now - then > Wrapping(ttl) && then - now > Wrapping(ttl) {
-                return peers
+                return peers;
             }
         }
         pos += 2;
         let v4count = data[pos] as usize;
         pos += 1;
         if v4count * 6 > data.len() - pos || (data.len() - pos - v4count * 6) % 18 > 0 {
-            return peers
+            return peers;
         }
         for _ in 0..v4count {
             assert!(data.len() >= pos + 6);
@@ -199,7 +197,7 @@ impl<TS: TimeSource> BeaconSerializer<TS> {
                 Ipv6Addr::new(ip[0], ip[1], ip[2], ip[3], ip[4], ip[5], ip[6], ip[7]),
                 port,
                 0,
-                0
+                0,
             ));
             peers.push(addr);
         }
@@ -213,9 +211,13 @@ impl<TS: TimeSource> BeaconSerializer<TS> {
     pub fn write_to_file<P: AsRef<Path>>(&self, peers: &[SocketAddr], path: P) -> Result<(), io::Error> {
         let beacon = self.encode(peers);
         debug!("Beacon: {}", beacon);
-        let mut f = File::create(&path)?;
+        let path = path.as_ref();
+        if path.exists() {
+            fs::remove_file(path)?
+        }
+        let mut f = File::create(path)?;
         writeln!(&mut f, "{}", beacon)?;
-        fs::set_permissions(&path, Permissions::from_mode(0o644))?;
+        fs::set_permissions(path, Permissions::from_mode(0o444))?;
         Ok(())
     }
 
@@ -226,7 +228,7 @@ impl<TS: TimeSource> BeaconSerializer<TS> {
         let beacon = format!("{}{}{}", begin, data, end);
         debug!("Calling beacon command: {}", cmd);
         let process = Command::new("sh")
-            .args(&["-c", cmd])
+            .args(["-c", cmd])
             .env("begin", begin)
             .env("data", data)
             .env("end", end)
@@ -259,14 +261,14 @@ impl<TS: TimeSource> BeaconSerializer<TS> {
                 peers.append(&mut self.peerlist_decode(&data[start_pos..end_pos], ttl_hours));
                 pos = start_pos
             } else {
-                break
+                break;
             }
         }
         peers
     }
 
     pub fn read_from_file<P: AsRef<Path>>(
-        &self, path: P, ttl_hours: Option<u16>
+        &self, path: P, ttl_hours: Option<u16>,
     ) -> Result<Vec<SocketAddr>, io::Error> {
         let mut f = File::open(&path)?;
         let mut contents = String::new();
@@ -279,7 +281,7 @@ impl<TS: TimeSource> BeaconSerializer<TS> {
         let end = self.end();
         debug!("Calling beacon command: {}", cmd);
         let process = Command::new("sh")
-            .args(&["-c", cmd])
+            .args(["-c", cmd])
             .env("begin", begin)
             .env("end", end)
             .stdout(Stdio::piped())
@@ -313,134 +315,117 @@ impl<TS: TimeSource> BeaconSerializer<TS> {
     }
 }
 
-
-#[cfg(test)] use crate::util::MockTimeSource;
-#[cfg(test)] use std::str::FromStr;
-#[cfg(test)] use std::time::Duration;
-#[cfg(test)] use tempfile;
+#[cfg(test)]
+use crate::util::MockTimeSource;
+#[cfg(test)]
+use std::str::FromStr;
+#[cfg(test)]
+use std::time::Duration;
 
 #[test]
 fn encode() {
     MockTimeSource::set_time(2000 * 3600);
-    let ser = BeaconSerializer::<MockTimeSource>::new(b"vpnc", b"mysecretkey");
-    let mut peers = Vec::new();
-    peers.push(SocketAddr::from_str("1.2.3.4:5678").unwrap());
-    peers.push(SocketAddr::from_str("6.6.6.6:53").unwrap());
-    assert_eq!("3hRD85V3h1P0g5Un9ZWnoqRDo7ZIxYMB", ser.encode(&peers));
+    let ser = BeaconSerializer::<MockTimeSource>::new(b"mysecretkey");
+    let mut peers = vec![SocketAddr::from_str("1.2.3.4:5678").unwrap(), SocketAddr::from_str("6.6.6.6:53").unwrap()];
+    assert_eq!("WsHI31EWDMBYxvITiILIrm2k9gEik22E", ser.encode(&peers));
     peers.push(SocketAddr::from_str("[::1]:5678").unwrap());
-    assert_eq!("3hRD8BKvg7jotek0FGLeYtIc1zj7jzPRyQscQAe9tCqnFJ0vyVfIxYMB", ser.encode(&peers));
-    let mut peers = Vec::new();
-    peers.push(SocketAddr::from_str("1.2.3.4:5678").unwrap());
-    peers.push(SocketAddr::from_str("6.6.6.6:54").unwrap());
-    assert_eq!("3hRD86NwMC5dPp8bh5idzhMal4AIxYMB", ser.encode(&peers));
+    assert_eq!("WsHI3GXKaXCveo6uejmZizZ72kR6Y0L9T7h49TXONp1ugfKvvvEik22E", ser.encode(&peers));
+    let peers = vec![SocketAddr::from_str("1.2.3.4:5678").unwrap(), SocketAddr::from_str("6.6.6.6:54").unwrap()];
+    assert_eq!("WsHI32gm9eMSHP3Lm1GXcdP7rD3ik22E", ser.encode(&peers));
 }
 
 #[test]
 fn decode() {
     MockTimeSource::set_time(2000 * 3600);
-    let ser = BeaconSerializer::<MockTimeSource>::new(b"vpnc", b"mysecretkey");
-    let mut peers = Vec::new();
-    peers.push(SocketAddr::from_str("1.2.3.4:5678").unwrap());
-    peers.push(SocketAddr::from_str("6.6.6.6:53").unwrap());
-    assert_eq!(format!("{:?}", peers), format!("{:?}", ser.decode("3hRD85V3h1P0g5Un9ZWnoqRDo7ZIxYMB", None)));
+    let ser = BeaconSerializer::<MockTimeSource>::new(b"mysecretkey");
+    let mut peers = vec![SocketAddr::from_str("1.2.3.4:5678").unwrap(), SocketAddr::from_str("6.6.6.6:53").unwrap()];
+    assert_eq!(format!("{:?}", peers), format!("{:?}", ser.decode("WsHI31EWDMBYxvITiILIrm2k9gEik22E", None)));
     peers.push(SocketAddr::from_str("[::1]:5678").unwrap());
     assert_eq!(
         format!("{:?}", peers),
-        format!("{:?}", ser.decode("3hRD8BKvg7jotek0FGLeYtIc1zj7jzPRyQscQAe9tCqnFJ0vyVfIxYMB", None))
+        format!("{:?}", ser.decode("WsHI3GXKaXCveo6uejmZizZ72kR6Y0L9T7h49TXONp1ugfKvvvEik22E", None))
     );
 }
 
 #[test]
 fn decode_split() {
     MockTimeSource::set_time(2000 * 3600);
-    let ser = BeaconSerializer::<MockTimeSource>::new(b"vpnc", b"mysecretkey");
-    let mut peers = Vec::new();
-    peers.push(SocketAddr::from_str("1.2.3.4:5678").unwrap());
-    peers.push(SocketAddr::from_str("6.6.6.6:53").unwrap());
+    let ser = BeaconSerializer::<MockTimeSource>::new(b"mysecretkey");
+    let peers = vec![SocketAddr::from_str("1.2.3.4:5678").unwrap(), SocketAddr::from_str("6.6.6.6:53").unwrap()];
     assert_eq!(
         format!("{:?}", peers),
-        format!("{:?}", ser.decode("3hRD8-5V.3h:1P 0g\t5U\nn9(ZW)no[qR]Doü7ZäIxYMB", None))
+        format!("{:?}", ser.decode("WsHI3-1E.WD:MB Yx\tvI\nTi(IL)Ir[m2]k9ügEäik22E", None))
     );
     assert_eq!(
         format!("{:?}", peers),
-        format!("{:?}", ser.decode("3 -, \nhR--D85V3h1P0g5Un9ZWnoqRDo7ZI(x}YÖÄÜ\nMB", None))
+        format!("{:?}", ser.decode("W -, \nsH--I31EWDMBYxvITiILIrm2k9gEi(k)2ÖÄÜ\n2E", None))
     );
 }
 
 #[test]
 fn decode_offset() {
     MockTimeSource::set_time(2000 * 3600);
-    let ser = BeaconSerializer::<MockTimeSource>::new(b"vpnc", b"mysecretkey");
-    let mut peers = Vec::new();
-    peers.push(SocketAddr::from_str("1.2.3.4:5678").unwrap());
-    peers.push(SocketAddr::from_str("6.6.6.6:53").unwrap());
+    let ser = BeaconSerializer::<MockTimeSource>::new(b"mysecretkey");
+    let peers = vec![SocketAddr::from_str("1.2.3.4:5678").unwrap(), SocketAddr::from_str("6.6.6.6:53").unwrap()];
     assert_eq!(
         format!("{:?}", peers),
-        format!("{:?}", ser.decode("Hello World: 3hRD85V3h1P0g5Un9ZWnoqRDo7ZIxYMB! End of the World", None))
+        format!("{:?}", ser.decode("Hello World: WsHI31EWDMBYxvITiILIrm2k9gEik22E! End of the World", None))
     );
 }
 
 #[test]
 fn decode_multiple() {
     MockTimeSource::set_time(2000 * 3600);
-    let ser = BeaconSerializer::<MockTimeSource>::new(b"vpnc", b"mysecretkey");
-    let mut peers = Vec::new();
-    peers.push(SocketAddr::from_str("1.2.3.4:5678").unwrap());
-    peers.push(SocketAddr::from_str("6.6.6.6:53").unwrap());
+    let ser = BeaconSerializer::<MockTimeSource>::new(b"mysecretkey");
+    let peers = vec![SocketAddr::from_str("1.2.3.4:5678").unwrap(), SocketAddr::from_str("6.6.6.6:53").unwrap()];
     assert_eq!(
         format!("{:?}", peers),
-        format!("{:?}", ser.decode("3hRD850fTOmqFffvcJEIxYMB 3hRD823uwTS47pupeONIxYMB", None))
+        format!("{:?}", ser.decode("WsHI31HVpqxFNMNSPrvik22E WsHI34yOBcZIulKdtn2ik22E", None))
     );
 }
 
 #[test]
 fn decode_ttl() {
     MockTimeSource::set_time(2000 * 3600);
-    let ser = BeaconSerializer::<MockTimeSource>::new(b"vpnc", b"mysecretkey");
-    let mut peers = Vec::new();
-    peers.push(SocketAddr::from_str("1.2.3.4:5678").unwrap());
-    peers.push(SocketAddr::from_str("6.6.6.6:53").unwrap());
+    let ser = BeaconSerializer::<MockTimeSource>::new(b"mysecretkey");
     MockTimeSource::set_time(2000 * 3600);
-    assert_eq!(2, ser.decode("3hRD85V3h1P0g5Un9ZWnoqRDo7ZIxYMB", None).len());
+    assert_eq!(2, ser.decode("WsHI31EWDMBYxvITiILIrm2k9gEik22E", None).len());
     MockTimeSource::set_time(2100 * 3600);
-    assert_eq!(2, ser.decode("3hRD85V3h1P0g5Un9ZWnoqRDo7ZIxYMB", None).len());
+    assert_eq!(2, ser.decode("WsHI31EWDMBYxvITiILIrm2k9gEik22E", None).len());
     MockTimeSource::set_time(2005 * 3600);
-    assert_eq!(2, ser.decode("3hRD85V3h1P0g5Un9ZWnoqRDo7ZIxYMB", None).len());
+    assert_eq!(2, ser.decode("WsHI31EWDMBYxvITiILIrm2k9gEik22E", None).len());
     MockTimeSource::set_time(1995 * 3600);
-    assert_eq!(2, ser.decode("3hRD85V3h1P0g5Un9ZWnoqRDo7ZIxYMB", None).len());
+    assert_eq!(2, ser.decode("WsHI31EWDMBYxvITiILIrm2k9gEik22E", None).len());
     MockTimeSource::set_time(2000 * 3600);
-    assert_eq!(2, ser.decode("3hRD85V3h1P0g5Un9ZWnoqRDo7ZIxYMB", Some(24)).len());
+    assert_eq!(2, ser.decode("WsHI31EWDMBYxvITiILIrm2k9gEik22E", Some(24)).len());
     MockTimeSource::set_time(1995 * 3600);
-    assert_eq!(2, ser.decode("3hRD85V3h1P0g5Un9ZWnoqRDo7ZIxYMB", Some(24)).len());
+    assert_eq!(2, ser.decode("WsHI31EWDMBYxvITiILIrm2k9gEik22E", Some(24)).len());
     MockTimeSource::set_time(2005 * 3600);
-    assert_eq!(2, ser.decode("3hRD85V3h1P0g5Un9ZWnoqRDo7ZIxYMB", Some(24)).len());
+    assert_eq!(2, ser.decode("WsHI31EWDMBYxvITiILIrm2k9gEik22E", Some(24)).len());
     MockTimeSource::set_time(2100 * 3600);
-    assert_eq!(0, ser.decode("3hRD85V3h1P0g5Un9ZWnoqRDo7ZIxYMB", Some(24)).len());
+    assert_eq!(0, ser.decode("WsHI31EWDMBYxvITiILIrm2k9gEik22E", Some(24)).len());
     MockTimeSource::set_time(1900 * 3600);
-    assert_eq!(0, ser.decode("3hRD85V3h1P0g5Un9ZWnoqRDo7ZIxYMB", Some(24)).len());
+    assert_eq!(0, ser.decode("WsHI31EWDMBYxvITiILIrm2k9gEik22E", Some(24)).len());
 }
 
 #[test]
 fn decode_invalid() {
     MockTimeSource::set_time(2000 * 3600);
-    let ser = BeaconSerializer::<MockTimeSource>::new(b"vpnc", b"mysecretkey");
+    let ser = BeaconSerializer::<MockTimeSource>::new(b"mysecretkey");
     assert_eq!(0, ser.decode("", None).len());
-    assert_eq!(0, ser.decode("3hRD8IxYMB", None).len());
-    assert_eq!(0, ser.decode("3hRD8--", None).len());
-    assert_eq!(0, ser.decode("--IxYMB", None).len());
-    assert_eq!(0, ser.decode("3hRD85V3h1P0g5Un8ZWnoqRDo7ZIxYMB", None).len());
-    assert_eq!(2, ser.decode("IxYMB3hRD85V3h1P0g5Un9ZWnoqRDo7ZIxYMB3hRD8", None).len());
-    assert_eq!(2, ser.decode("3hRD83hRD85V3h1P0g5Un9ZWnoqRDo7ZIxYMBIxYMB", None).len());
+    assert_eq!(0, ser.decode("WsHI3ik22E", None).len());
+    assert_eq!(0, ser.decode("WsHI3--", None).len());
+    assert_eq!(0, ser.decode("--ik22E", None).len());
+    assert_eq!(0, ser.decode("WsHI32EWDMBYxvITiILIrm2k9gEik22E", None).len());
+    assert_eq!(2, ser.decode("ik22EWsHI31EWDMBYxvITiILIrm2k9gEik22EWsHI3", None).len());
+    assert_eq!(2, ser.decode("WsHI3WsHI31EWDMBYxvITiILIrm2k9gEik22Eik22E", None).len());
 }
 
-
 #[test]
 fn encode_decode() {
     MockTimeSource::set_time(2000 * 3600);
-    let ser = BeaconSerializer::<MockTimeSource>::new(b"vpnc", b"mysecretkey");
-    let mut peers = Vec::new();
-    peers.push(SocketAddr::from_str("1.2.3.4:5678").unwrap());
-    peers.push(SocketAddr::from_str("6.6.6.6:53").unwrap());
+    let ser = BeaconSerializer::<MockTimeSource>::new(b"mysecretkey");
+    let peers = vec![SocketAddr::from_str("1.2.3.4:5678").unwrap(), SocketAddr::from_str("6.6.6.6:53").unwrap()];
     let data = ser.encode(&peers);
     let peers2 = ser.decode(&data, None);
     assert_eq!(format!("{:?}", peers), format!("{:?}", peers2));
@@ -449,10 +434,8 @@ fn encode_decode() {
 #[test]
 fn encode_decode_file() {
     MockTimeSource::set_time(2000 * 3600);
-    let ser = BeaconSerializer::<MockTimeSource>::new(b"vpnc", b"mysecretkey");
-    let mut peers = Vec::new();
-    peers.push(SocketAddr::from_str("1.2.3.4:5678").unwrap());
-    peers.push(SocketAddr::from_str("6.6.6.6:53").unwrap());
+    let ser = BeaconSerializer::<MockTimeSource>::new(b"mysecretkey");
+    let peers = vec![SocketAddr::from_str("1.2.3.4:5678").unwrap(), SocketAddr::from_str("6.6.6.6:53").unwrap()];
     let file = tempfile::NamedTempFile::new().expect("Failed to create temp file");
     assert!(ser.write_to_file(&peers, file.path()).is_ok());
     let peers2 = ser.read_from_file(file.path(), None);
@@ -463,10 +446,8 @@ fn encode_decode_file() {
 #[test]
 fn encode_decode_cmd() {
     MockTimeSource::set_time(2000 * 3600);
-    let ser = BeaconSerializer::<MockTimeSource>::new(b"vpnc", b"mysecretkey");
-    let mut peers = Vec::new();
-    peers.push(SocketAddr::from_str("1.2.3.4:5678").unwrap());
-    peers.push(SocketAddr::from_str("6.6.6.6:53").unwrap());
+    let ser = BeaconSerializer::<MockTimeSource>::new(b"mysecretkey");
+    let peers = vec![SocketAddr::from_str("1.2.3.4:5678").unwrap(), SocketAddr::from_str("6.6.6.6:53").unwrap()];
     let file = tempfile::NamedTempFile::new().expect("Failed to create temp file");
     assert!(ser.write_to_cmd(&peers, &format!("echo $beacon > {}", file.path().display())).is_ok());
     thread::sleep(Duration::from_millis(100));

src/benches.rs

@@ -1,182 +0,0 @@
-// VpnCloud - Peer-to-Peer VPN
-// Copyright (C) 2015-2019  Dennis Schwerdel
-// This software is licensed under GPL-3 or newer (see LICENSE.md)
-
-use test::Bencher;
-
-use std::{
-    net::{Ipv4Addr, SocketAddr, SocketAddrV4, ToSocketAddrs, UdpSocket},
-    str::FromStr
-};
-
-use super::{
-    cloud::GenericCloud,
-    config::Config,
-    crypto::{Crypto, CryptoMethod},
-    device::{TunTapDevice, Type},
-    ethernet::{self, SwitchTable},
-    ip::Packet,
-    net::MockSocket,
-    poll::WaitImpl,
-    types::{Address, Protocol, Table},
-    udpmessage::{decode, encode, Message},
-    util::{MockTimeSource, SystemTimeSource, TimeSource},
-    MAGIC
-};
-
-#[bench]
-fn crypto_chacha20(b: &mut Bencher) {
-    let mut crypto = Crypto::from_shared_key(CryptoMethod::ChaCha20, "test");
-    let mut payload = [0; 1500];
-    let header = [0; 8];
-    let mut nonce_bytes = [0; 12];
-    b.iter(|| {
-        let len = crypto.encrypt(&mut payload, 1400, &mut nonce_bytes, &header);
-        assert!(crypto.decrypt(&mut payload[..len], &nonce_bytes, &header).is_ok())
-    });
-    b.bytes = 1400;
-}
-
-#[bench]
-fn crypto_aes256(b: &mut Bencher) {
-    let mut crypto = Crypto::from_shared_key(CryptoMethod::AES256, "test");
-    let mut payload = [0; 1500];
-    let header = [0; 8];
-    let mut nonce_bytes = [0; 12];
-    b.iter(|| {
-        let len = crypto.encrypt(&mut payload, 1400, &mut nonce_bytes, &header);
-        assert!(crypto.decrypt(&mut payload[..len], &nonce_bytes, &header).is_ok());
-    });
-    b.bytes = 1400;
-}
-
-#[bench]
-fn message_encode(b: &mut Bencher) {
-    let mut crypto = Crypto::None;
-    let mut payload = [0; 1600];
-    let mut msg = Message::Data(&mut payload, 64, 1464);
-    let mut buf = [0; 1600];
-    b.iter(|| {
-        encode(&mut msg, &mut buf[..], MAGIC, &mut crypto);
-    });
-    b.bytes = 1400;
-}
-
-#[bench]
-fn message_decode(b: &mut Bencher) {
-    let mut crypto = Crypto::None;
-    let mut payload = [0; 1600];
-    let mut msg = Message::Data(&mut payload, 64, 1464);
-    let mut buf = [0; 1600];
-    let mut res = encode(&mut msg, &mut buf[..], MAGIC, &mut crypto);
-    b.iter(|| {
-        decode(&mut res, MAGIC, &mut crypto).unwrap();
-    });
-    b.bytes = 1400;
-}
-
-#[bench]
-fn switch_learn(b: &mut Bencher) {
-    let mut table = SwitchTable::<SystemTimeSource>::new(10, 0);
-    let addr = Address::from_str("12:34:56:78:90:ab").unwrap();
-    let peer = "1.2.3.4:5678".to_socket_addrs().unwrap().next().unwrap();
-    b.iter(|| {
-        table.learn(addr.clone(), None, peer);
-    });
-    b.bytes = 1400;
-}
-
-#[bench]
-fn switch_lookup(b: &mut Bencher) {
-    let mut table = SwitchTable::<SystemTimeSource>::new(10, 0);
-    let addr = Address::from_str("12:34:56:78:90:ab").unwrap();
-    let peer = "1.2.3.4:5678".to_socket_addrs().unwrap().next().unwrap();
-    table.learn(addr.clone(), None, peer);
-    b.iter(|| {
-        table.lookup(&addr);
-    });
-    b.bytes = 1400;
-}
-
-#[bench]
-fn ethernet_parse(b: &mut Bencher) {
-    let mut data = [0; 1500];
-    data[5] = 45;
-    b.iter(|| ethernet::Frame::parse(&data).unwrap());
-    b.bytes = 1400;
-}
-
-#[bench]
-fn ipv4_parse(b: &mut Bencher) {
-    let mut data = [0; 1500];
-    data[0] = 4 * 16;
-    b.iter(|| Packet::parse(&data).unwrap());
-    b.bytes = 1400;
-}
-
-#[bench]
-fn ipv6_parse(b: &mut Bencher) {
-    let mut data = [0; 1500];
-    data[0] = 6 * 16;
-    b.iter(|| Packet::parse(&data).unwrap());
-    b.bytes = 1400;
-}
-
-#[bench]
-fn now(b: &mut Bencher) {
-    b.iter(|| SystemTimeSource::now());
-    b.bytes = 1400;
-}
-
-#[bench]
-fn epoll_wait(b: &mut Bencher) {
-    let socketv4 = UdpSocket::bind("0.0.0.0:0").unwrap();
-    let socketv6 = UdpSocket::bind("[::]:0").unwrap();
-    let device = TunTapDevice::dummy("dummy", "/dev/zero", Type::Dummy).unwrap();
-    let mut waiter = WaitImpl::testing(&socketv4, &socketv6, &device, 1000).unwrap();
-    b.iter(|| assert!(waiter.next().is_some()));
-    b.bytes = 1400;
-}
-
-type TestNode = GenericCloud<TunTapDevice, ethernet::Frame, SwitchTable<MockTimeSource>, MockSocket, MockTimeSource>;
-
-fn create_test_node() -> TestNode {
-    TestNode::new(
-        &Config::default(),
-        TunTapDevice::dummy("dummy", "/dev/null", Type::Tap).unwrap(),
-        SwitchTable::new(1800, 10),
-        true,
-        true,
-        vec![],
-        Crypto::None,
-        None
-    )
-}
-
-#[bench]
-fn handle_interface_data(b: &mut Bencher) {
-    let mut node = create_test_node();
-    let mut data = [0; 1500];
-    data[105] = 45;
-    b.iter(|| node.handle_interface_data(&mut data, 100, 1400).unwrap());
-    b.bytes = 1400;
-}
-
-#[bench]
-fn handle_net_message(b: &mut Bencher) {
-    let mut node = create_test_node();
-    let addr = SocketAddr::V4(SocketAddrV4::new(Ipv4Addr::new(127, 0, 0, 1), 1));
-    let mut data = [0; 1500];
-    data[105] = 45;
-    b.iter(|| node.handle_net_message(addr.clone(), Message::Data(&mut data, 0, 1400)).unwrap());
-    b.bytes = 1400;
-}
-
-#[bench]
-fn udp_send(b: &mut Bencher) {
-    let sock = UdpSocket::bind("127.0.0.1:0").unwrap();
-    let data = [0; 1400];
-    let addr = SocketAddrV4::new(Ipv4Addr::new(127, 0, 0, 1), 1);
-    b.iter(|| sock.send_to(&data, &addr).unwrap());
-    b.bytes = 1400;
-}

src/c/Makefile

@@ -1,7 +0,0 @@
-default: libtuntap.a
-
-tapdev.o: tuntap.c
-	gcc -Os -c tuntap.c
-
-libtapdev.a: tuntap.o
-	ar rcs libtuntap.a tuntap.o

src/c/tuntap.c

@@ -1,27 +0,0 @@
-// VpnCloud - Peer-to-Peer VPN
-// Copyright (C) 2015-2019  Dennis Schwerdel
-// This software is licensed under GPL-3 or newer (see LICENSE.md)
-
-#include <stdint.h>
-#include <net/if.h>
-#include <linux/if_tun.h>
-#include <string.h>
-#include <sys/ioctl.h>
-
-int32_t setup_device(int32_t fd, char *ifname, int32_t flags) {
-  struct ifreq ifr;
-  memset(&ifr, 0, sizeof(ifr));
-  ifr.ifr_flags = flags;
-  strncpy(ifr.ifr_name, ifname, IFNAMSIZ);
-  if (ioctl(fd, TUNSETIFF, (void *)&ifr) < 0) return 1;
-  strncpy(ifname, ifr.ifr_name, IFNAMSIZ);
-  return 0;
-}
-
-int32_t setup_tap_device(int32_t fd, char *ifname) {
-  return setup_device(fd, ifname, IFF_TAP | IFF_NO_PI);
-}
-
-int32_t setup_tun_device(int32_t fd, char *ifname) {
-  return setup_device(fd, ifname, IFF_TUN | IFF_NO_PI);
-}

src/crypto.rs

@@ -1,209 +0,0 @@
-// VpnCloud - Peer-to-Peer VPN
-// Copyright (C) 2015-2019  Dennis Schwerdel
-// This software is licensed under GPL-3 or newer (see LICENSE.md)
-
-use std::num::NonZeroU32;
-
-use ring::{aead::*, pbkdf2, rand::*};
-
-use super::types::Error;
-
-const SALT: &[u8; 32] = b"vpncloudVPNCLOUDvpncl0udVpnCloud";
-const HEX_PREFIX: &str = "hex:";
-const HASH_PREFIX: &str = "hash:";
-
-#[derive(Serialize, Deserialize, Debug, PartialEq, Clone, Copy)]
-pub enum CryptoMethod {
-    #[serde(rename = "chacha20")]
-    ChaCha20,
-    #[serde(rename = "aes256")]
-    AES256
-}
-
-pub struct CryptoData {
-    crypto_key: LessSafeKey,
-    nonce: Vec<u8>,
-    key: Vec<u8>
-}
-
-#[allow(unknown_lints, clippy::large_enum_variant)]
-pub enum Crypto {
-    None,
-    ChaCha20Poly1305(CryptoData),
-    AES256GCM(CryptoData)
-}
-
-fn inc_nonce(nonce: &mut [u8]) {
-    let l = nonce.len();
-    for i in (0..l).rev() {
-        let mut num = nonce[i];
-        num = num.wrapping_add(1);
-        nonce[i] = num;
-        if num > 0 {
-            return
-        }
-    }
-    warn!("Nonce overflowed");
-}
-
-impl Crypto {
-    #[inline]
-    pub fn method(&self) -> u8 {
-        match *self {
-            Crypto::None => 0,
-            Crypto::ChaCha20Poly1305 { .. } => 1,
-            Crypto::AES256GCM { .. } => 2
-        }
-    }
-
-    #[inline]
-    pub fn nonce_bytes(&self) -> usize {
-        match *self {
-            Crypto::None => 0,
-            Crypto::ChaCha20Poly1305(ref data) | Crypto::AES256GCM(ref data) => data.crypto_key.algorithm().nonce_len()
-        }
-    }
-
-    #[inline]
-    pub fn get_key(&self) -> &[u8] {
-        match *self {
-            Crypto::None => &[],
-            Crypto::ChaCha20Poly1305(ref data) | Crypto::AES256GCM(ref data) => &data.key
-        }
-    }
-
-    #[inline]
-    #[allow(unknown_lints, clippy::match_same_arms)]
-    pub fn additional_bytes(&self) -> usize {
-        match *self {
-            Crypto::None => 0,
-            Crypto::ChaCha20Poly1305(ref data) | Crypto::AES256GCM(ref data) => data.crypto_key.algorithm().tag_len()
-        }
-    }
-
-    pub fn from_shared_key(method: CryptoMethod, password: &str) -> Self {
-        let algo = match method {
-            CryptoMethod::ChaCha20 => &CHACHA20_POLY1305,
-            CryptoMethod::AES256 => &AES_256_GCM
-        };
-        let mut key: Vec<u8> = Vec::with_capacity(algo.key_len());
-        for _ in 0..algo.key_len() {
-            key.push(0);
-        }
-        if password.starts_with(HEX_PREFIX) {
-            let password = &password[HEX_PREFIX.len()..];
-            if password.len() != 2 * algo.key_len() {
-                fail!("Raw secret key must be exactly {} bytes long", algo.key_len());
-            }
-            for i in 0..algo.key_len() {
-                key[i] = try_fail!(
-                    u8::from_str_radix(&password[2 * i..=2 * i + 1], 16),
-                    "Failed to parse raw secret key: {}"
-                );
-            }
-        } else {
-            let password = if password.starts_with(HASH_PREFIX) { &password[HASH_PREFIX.len()..] } else { password };
-            pbkdf2::derive(
-                pbkdf2::PBKDF2_HMAC_SHA256,
-                NonZeroU32::new(4096).unwrap(),
-                SALT,
-                password.as_bytes(),
-                &mut key
-            );
-        }
-        let crypto_key = LessSafeKey::new(UnboundKey::new(algo, &key[..algo.key_len()]).expect("Failed to create key"));
-        let mut nonce: Vec<u8> = Vec::with_capacity(algo.nonce_len());
-        for _ in 0..algo.nonce_len() {
-            nonce.push(0);
-        }
-        // leave the highest byte of the nonce 0 so it will not overflow
-        if SystemRandom::new().fill(&mut nonce[1..]).is_err() {
-            fail!("Randomizing nonce failed");
-        }
-        let data = CryptoData { crypto_key, nonce, key };
-        match method {
-            CryptoMethod::ChaCha20 => Crypto::ChaCha20Poly1305(data),
-            CryptoMethod::AES256 => Crypto::AES256GCM(data)
-        }
-    }
-
-    pub fn decrypt(&self, buf: &mut [u8], nonce: &[u8], header: &[u8]) -> Result<usize, Error> {
-        match *self {
-            Crypto::None => Ok(buf.len()),
-            Crypto::ChaCha20Poly1305(ref data) | Crypto::AES256GCM(ref data) => {
-                let nonce = Nonce::try_assume_unique_for_key(nonce).unwrap();
-                match data.crypto_key.open_in_place(nonce, Aad::from(header), buf) {
-                    Ok(plaintext) => Ok(plaintext.len()),
-                    Err(_) => Err(Error::Crypto("Failed to decrypt"))
-                }
-            }
-        }
-    }
-
-    pub fn encrypt(&mut self, buf: &mut [u8], mlen: usize, nonce_bytes: &mut [u8], header: &[u8]) -> usize {
-        let tag_len = self.additional_bytes();
-        match *self {
-            Crypto::None => mlen,
-            Crypto::ChaCha20Poly1305(ref mut data) | Crypto::AES256GCM(ref mut data) => {
-                inc_nonce(&mut data.nonce);
-                assert!(buf.len() - mlen >= tag_len);
-                let nonce = Nonce::try_assume_unique_for_key(&data.nonce).unwrap();
-                let tag = data
-                    .crypto_key
-                    .seal_in_place_separate_tag(nonce, Aad::from(header), &mut buf[..mlen])
-                    .expect("Failed to encrypt");
-                buf[mlen..mlen + tag_len].copy_from_slice(tag.as_ref());
-                nonce_bytes.clone_from_slice(&data.nonce);
-                mlen + tag_len
-            }
-        }
-    }
-}
-
-#[test]
-fn encrypt_decrypt_chacha20poly1305() {
-    let mut sender = Crypto::from_shared_key(CryptoMethod::ChaCha20, "test");
-    let receiver = Crypto::from_shared_key(CryptoMethod::ChaCha20, "test");
-    let msg = "HelloWorld0123456789";
-    let msg_bytes = msg.as_bytes();
-    let mut buffer = [0u8; 1024];
-    let header = [0u8; 8];
-    for i in 0..msg_bytes.len() {
-        buffer[i] = msg_bytes[i];
-    }
-    let mut nonce1 = [0u8; 12];
-    let size = sender.encrypt(&mut buffer, msg_bytes.len(), &mut nonce1, &header);
-    assert_eq!(size, msg_bytes.len() + sender.additional_bytes());
-    assert!(msg_bytes != &buffer[..msg_bytes.len()] as &[u8]);
-    receiver.decrypt(&mut buffer[..size], &nonce1, &header).unwrap();
-    assert_eq!(msg_bytes, &buffer[..msg_bytes.len()] as &[u8]);
-    let mut nonce2 = [0u8; 12];
-    let size = sender.encrypt(&mut buffer, msg_bytes.len(), &mut nonce2, &header);
-    assert!(nonce1 != nonce2);
-    receiver.decrypt(&mut buffer[..size], &nonce2, &header).unwrap();
-    assert_eq!(msg_bytes, &buffer[..msg_bytes.len()] as &[u8]);
-}
-
-#[test]
-fn encrypt_decrypt_aes256() {
-    let mut sender = Crypto::from_shared_key(CryptoMethod::AES256, "test");
-    let receiver = Crypto::from_shared_key(CryptoMethod::AES256, "test");
-    let msg = "HelloWorld0123456789";
-    let msg_bytes = msg.as_bytes();
-    let mut buffer = [0u8; 1024];
-    let header = [0u8; 8];
-    for i in 0..msg_bytes.len() {
-        buffer[i] = msg_bytes[i];
-    }
-    let mut nonce1 = [0u8; 12];
-    let size = sender.encrypt(&mut buffer, msg_bytes.len(), &mut nonce1, &header);
-    assert_eq!(size, msg_bytes.len() + sender.additional_bytes());
-    assert!(msg_bytes != &buffer[..msg_bytes.len()] as &[u8]);
-    receiver.decrypt(&mut buffer[..size], &nonce1, &header).unwrap();
-    assert_eq!(msg_bytes, &buffer[..msg_bytes.len()] as &[u8]);
-    let mut nonce2 = [0u8; 12];
-    let size = sender.encrypt(&mut buffer, msg_bytes.len(), &mut nonce2, &header);
-    assert!(nonce1 != nonce2);
-    receiver.decrypt(&mut buffer[..size], &nonce2, &header).unwrap();
-    assert_eq!(msg_bytes, &buffer[..msg_bytes.len()] as &[u8]);
-}

src/crypto/common.rs

@@ -0,0 +1,507 @@
+use super::{
+    core::{test_speed, CryptoCore},
+    init::{self, InitResult, InitState, CLOSING},
+    rotate::RotationState,
+};
+use crate::{
+    error::Error,
+    types::NodeId,
+    util::{from_base62, to_base62, MsgBuffer},
+};
+use ring::{
+    aead::{self, Algorithm, LessSafeKey, UnboundKey},
+    agreement::{EphemeralPrivateKey, UnparsedPublicKey},
+    pbkdf2,
+    rand::{SecureRandom, SystemRandom},
+    signature::{Ed25519KeyPair, KeyPair, ED25519_PUBLIC_KEY_LEN},
+};
+use smallvec::{smallvec, SmallVec};
+use std::{fmt::Debug, io::Read, num::NonZeroU32, sync::Arc, time::Duration};
+
+const SALT: &[u8; 32] = b"vpncloudVPNCLOUDvpncl0udVpnCloud";
+const INIT_MESSAGE_FIRST_BYTE: u8 = 0xff;
+const MESSAGE_TYPE_ROTATION: u8 = 0x10;
+
+pub type Ed25519PublicKey = [u8; ED25519_PUBLIC_KEY_LEN];
+pub type EcdhPublicKey = UnparsedPublicKey<SmallVec<[u8; 96]>>;
+pub type EcdhPrivateKey = EphemeralPrivateKey;
+pub type Key = SmallVec<[u8; 32]>;
+
+const DEFAULT_ALGORITHMS: [&str; 3] = ["AES128", "AES256", "CHACHA20"];
+
+#[cfg(test)]
+const SPEED_TEST_TIME: f32 = 0.02;
+#[cfg(not(test))]
+const SPEED_TEST_TIME: f32 = 0.1;
+
+const ROTATE_INTERVAL: usize = 120;
+
+pub trait Payload: Debug + PartialEq + Sized {
+    fn write_to(&self, buffer: &mut MsgBuffer);
+    fn read_from<R: Read>(r: R) -> Result<Self, Error>;
+}
+
+#[derive(Clone)]
+pub struct Algorithms {
+    pub algorithm_speeds: SmallVec<[(&'static Algorithm, f32); 3]>,
+    pub allow_unencrypted: bool,
+}
+
+#[derive(Debug, Default, Deserialize, Serialize, Clone, PartialEq)]
+#[serde(rename_all = "kebab-case", deny_unknown_fields, default)]
+pub struct Config {
+    pub password: Option<String>,
+    pub private_key: Option<String>,
+    pub public_key: Option<String>,
+    pub trusted_keys: Vec<String>,
+    pub algorithms: Vec<String>,
+}
+
+pub struct Crypto {
+    node_id: NodeId,
+    key_pair: Arc<Ed25519KeyPair>,
+    trusted_keys: Arc<[Ed25519PublicKey]>,
+    algorithms: Algorithms,
+}
+
+impl Crypto {
+    pub fn parse_algorithms(algos: &[String]) -> Result<(bool, Vec<&'static aead::Algorithm>), Error> {
+        let algorithms = algos.iter().map(|a| a as &str).collect::<Vec<_>>();
+        let allowed = if algorithms.is_empty() { &DEFAULT_ALGORITHMS } else { &algorithms as &[&str] };
+        let mut algos = vec![];
+        let mut unencrypted = false;
+        for name in allowed {
+            let algo = match &name.to_uppercase() as &str {
+                "UNENCRYPTED" | "NONE" | "PLAIN" => {
+                    unencrypted = true;
+                    continue;
+                }
+                "AES128" | "AES128_GCM" | "AES_128" | "AES_128_GCM" => &aead::AES_128_GCM,
+                "AES256" | "AES256_GCM" | "AES_256" | "AES_256_GCM" => &aead::AES_256_GCM,
+                "CHACHA" | "CHACHA20" | "CHACHA20_POLY1305" => &aead::CHACHA20_POLY1305,
+                _ => return Err(Error::InvalidConfig("Unknown crypto method")),
+            };
+            algos.push(algo)
+        }
+        Ok((unencrypted, algos))
+    }
+
+    pub fn new(node_id: NodeId, config: &Config) -> Result<Self, Error> {
+        let key_pair = if let Some(priv_key) = &config.private_key {
+            if let Some(pub_key) = &config.public_key {
+                Self::parse_keypair(priv_key, pub_key)?
+            } else {
+                Self::parse_private_key(priv_key)?
+            }
+        } else if let Some(password) = &config.password {
+            Self::keypair_from_password(password)
+        } else {
+            return Err(Error::InvalidConfig("Either private_key or password must be set"));
+        };
+        let mut trusted_keys = vec![];
+        for tn in &config.trusted_keys {
+            trusted_keys.push(Self::parse_public_key(tn)?);
+        }
+        if trusted_keys.is_empty() {
+            info!("Trusted keys not set, trusting only own public key");
+            let mut key = [0; ED25519_PUBLIC_KEY_LEN];
+            key.clone_from_slice(key_pair.public_key().as_ref());
+            trusted_keys.push(key);
+        }
+        let (unencrypted, allowed_algos) = Self::parse_algorithms(&config.algorithms)?;
+        if unencrypted {
+            warn!("Crypto settings allow unencrypted connections")
+        }
+        let mut algos = Algorithms { algorithm_speeds: smallvec![], allow_unencrypted: unencrypted };
+        let duration = Duration::from_secs_f32(SPEED_TEST_TIME);
+        let mut speeds = Vec::new();
+        for algo in allowed_algos {
+            let speed = test_speed(algo, &duration);
+            algos.algorithm_speeds.push((algo, speed as f32));
+            speeds.push((format!("{:?}", algo), speed as f32));
+        }
+        if !speeds.is_empty() {
+            info!(
+                "Crypto speeds: {}",
+                speeds.into_iter().map(|(a, s)| format!("{}: {:.1} MiB/s", a, s)).collect::<Vec<_>>().join(", ")
+            );
+        }
+        Ok(Self {
+            node_id,
+            key_pair: Arc::new(key_pair),
+            trusted_keys: trusted_keys.into_boxed_slice().into(),
+            algorithms: algos,
+        })
+    }
+
+    pub fn generate_keypair(password: Option<&str>) -> (String, String) {
+        let mut bytes = [0; 32];
+        match password {
+            None => {
+                let rng = SystemRandom::new();
+                rng.fill(&mut bytes).unwrap();
+            }
+            Some(password) => {
+                pbkdf2::derive(
+                    pbkdf2::PBKDF2_HMAC_SHA256,
+                    NonZeroU32::new(4096).unwrap(),
+                    SALT,
+                    password.as_bytes(),
+                    &mut bytes,
+                );
+            }
+        }
+        let keypair = Ed25519KeyPair::from_seed_unchecked(&bytes).unwrap();
+        let privkey = to_base62(&bytes);
+        let pubkey = to_base62(keypair.public_key().as_ref());
+        (privkey, pubkey)
+    }
+
+    fn keypair_from_password(password: &str) -> Ed25519KeyPair {
+        let mut key = [0; 32];
+        pbkdf2::derive(pbkdf2::PBKDF2_HMAC_SHA256, NonZeroU32::new(4096).unwrap(), SALT, password.as_bytes(), &mut key);
+        Ed25519KeyPair::from_seed_unchecked(&key).unwrap()
+    }
+
+    fn parse_keypair(privkey: &str, pubkey: &str) -> Result<Ed25519KeyPair, Error> {
+        let privkey = from_base62(privkey).map_err(|_| Error::InvalidConfig("Failed to parse private key"))?;
+        let pubkey = from_base62(pubkey).map_err(|_| Error::InvalidConfig("Failed to parse public key"))?;
+        let keypair = Ed25519KeyPair::from_seed_and_public_key(&privkey, &pubkey)
+            .map_err(|_| Error::InvalidConfig("Keys rejected by crypto library"))?;
+        Ok(keypair)
+    }
+
+    fn parse_private_key(privkey: &str) -> Result<Ed25519KeyPair, Error> {
+        let privkey = from_base62(privkey).map_err(|_| Error::InvalidConfig("Failed to parse private key"))?;
+        let keypair = Ed25519KeyPair::from_seed_unchecked(&privkey)
+            .map_err(|_| Error::InvalidConfig("Key rejected by crypto library"))?;
+        Ok(keypair)
+    }
+
+    fn parse_public_key(pubkey: &str) -> Result<Ed25519PublicKey, Error> {
+        let pubkey = from_base62(pubkey).map_err(|_| Error::InvalidConfig("Failed to parse public key"))?;
+        if pubkey.len() != ED25519_PUBLIC_KEY_LEN {
+            return Err(Error::InvalidConfig("Failed to parse public key"));
+        }
+        let mut result = [0; ED25519_PUBLIC_KEY_LEN];
+        result.clone_from_slice(&pubkey);
+        Ok(result)
+    }
+
+    pub fn public_key_from_private_key(privkey: &str) -> Result<String, Error> {
+        let keypair = Self::parse_private_key(privkey)?;
+        Ok(to_base62(keypair.public_key().as_ref()))
+    }
+
+    pub fn peer_instance<P: Payload>(&self, payload: P) -> PeerCrypto<P> {
+        PeerCrypto::new(
+            self.node_id,
+            payload,
+            self.key_pair.clone(),
+            self.trusted_keys.clone(),
+            self.algorithms.clone(),
+        )
+    }
+}
+
+#[derive(Debug, PartialEq)]
+pub enum MessageResult<P: Payload> {
+    Message(u8),
+    Initialized(P),
+    InitializedWithReply(P),
+    Reply,
+    None,
+}
+
+pub struct PeerCrypto<P: Payload> {
+    #[allow(dead_code)]
+    node_id: NodeId,
+    init: Option<InitState<P>>,
+    rotation: Option<RotationState>,
+    unencrypted: bool,
+    core: Option<CryptoCore>,
+    rotate_counter: usize,
+}
+
+impl<P: Payload> PeerCrypto<P> {
+    pub fn new(
+        node_id: NodeId, init_payload: P, key_pair: Arc<Ed25519KeyPair>, trusted_keys: Arc<[Ed25519PublicKey]>,
+        algorithms: Algorithms,
+    ) -> Self {
+        Self {
+            node_id,
+            init: Some(InitState::new(node_id, init_payload, key_pair, trusted_keys, algorithms)),
+            rotation: None,
+            unencrypted: false,
+            core: None,
+            rotate_counter: 0,
+        }
+    }
+
+    fn get_init(&mut self) -> Result<&mut InitState<P>, Error> {
+        if let Some(init) = &mut self.init {
+            Ok(init)
+        } else {
+            Err(Error::InvalidCryptoState("Initialization already finished"))
+        }
+    }
+
+    fn get_core(&mut self) -> Result<&mut CryptoCore, Error> {
+        if let Some(core) = &mut self.core {
+            Ok(core)
+        } else {
+            Err(Error::InvalidCryptoState("Crypto core not ready yet"))
+        }
+    }
+
+    fn get_rotation(&mut self) -> Result<&mut RotationState, Error> {
+        if let Some(rotation) = &mut self.rotation {
+            Ok(rotation)
+        } else {
+            Err(Error::InvalidCryptoState("Key rotation not initialized"))
+        }
+    }
+
+    pub fn initialize(&mut self, out: &mut MsgBuffer) -> Result<(), Error> {
+        let init = self.get_init()?;
+        if init.stage() != init::STAGE_PING {
+            Err(Error::InvalidCryptoState("Initialization already ongoing"))
+        } else {
+            init.send_ping(out);
+            out.prepend_byte(INIT_MESSAGE_FIRST_BYTE);
+            Ok(())
+        }
+    }
+
+    pub fn has_init(&self) -> bool {
+        self.init.is_some()
+    }
+
+    pub fn is_ready(&self) -> bool {
+        self.core.is_some()
+    }
+
+    pub fn algorithm_name(&self) -> &'static str {
+        if let Some(ref core) = self.core {
+            let algo = core.algorithm();
+            if algo == &aead::CHACHA20_POLY1305 {
+                "CHACHA20"
+            } else if algo == &aead::AES_128_GCM {
+                "AES128"
+            } else if algo == &aead::AES_256_GCM {
+                "AES256"
+            } else {
+                unreachable!()
+            }
+        } else {
+            "PLAIN"
+        }
+    }
+
+    fn handle_init_message(&mut self, buffer: &mut MsgBuffer) -> Result<MessageResult<P>, Error> {
+        let result = self.get_init()?.handle_init(buffer)?;
+        if !buffer.is_empty() {
+            buffer.prepend_byte(INIT_MESSAGE_FIRST_BYTE);
+        }
+        match result {
+            InitResult::Continue => Ok(MessageResult::Reply),
+            InitResult::Success { peer_payload, is_initiator } => {
+                self.core = self.get_init()?.take_core();
+                if self.core.is_none() {
+                    self.unencrypted = true;
+                }
+                if self.get_init()?.stage() == init::CLOSING {
+                    self.init = None
+                }
+                if self.core.is_some() {
+                    self.rotation = Some(RotationState::new(!is_initiator, buffer));
+                }
+                if !is_initiator {
+                    if self.unencrypted {
+                        return Ok(MessageResult::Initialized(peer_payload));
+                    }
+                    assert!(!buffer.is_empty());
+                    buffer.prepend_byte(MESSAGE_TYPE_ROTATION);
+                    self.encrypt_message(buffer)?;
+                }
+                Ok(MessageResult::InitializedWithReply(peer_payload))
+            }
+        }
+    }
+
+    fn handle_rotate_message(&mut self, data: &[u8]) -> Result<(), Error> {
+        if self.unencrypted {
+            return Ok(());
+        }
+        if let Some(rot) = self.get_rotation()?.handle_message(data)? {
+            let core = self.get_core()?;
+            let algo = core.algorithm();
+            let key = LessSafeKey::new(UnboundKey::new(algo, &rot.key[..algo.key_len()]).unwrap());
+            core.rotate_key(key, rot.id, rot.use_for_sending);
+        }
+        Ok(())
+    }
+
+    fn encrypt_message(&mut self, buffer: &mut MsgBuffer) -> Result<(), Error> {
+        if self.unencrypted {
+            return Ok(());
+        }
+        self.get_core()?.encrypt(buffer);
+        Ok(())
+    }
+
+    fn decrypt_message(&mut self, buffer: &mut MsgBuffer) -> Result<(), Error> {
+        // HOT PATH
+        if self.unencrypted {
+            return Ok(());
+        }
+        self.get_core()?.decrypt(buffer)
+    }
+
+    pub fn handle_message(&mut self, buffer: &mut MsgBuffer) -> Result<MessageResult<P>, Error> {
+        // HOT PATH
+        if buffer.is_empty() {
+            return Err(Error::InvalidCryptoState("No message in buffer"));
+        }
+        if is_init_message(buffer.buffer()) {
+            // COLD PATH
+            debug!("Received init message");
+            buffer.take_prefix();
+            self.handle_init_message(buffer)
+        } else {
+            // HOT PATH
+            debug!("Received encrypted message");
+            self.decrypt_message(buffer)?;
+            let msg_type = buffer.take_prefix();
+            if msg_type == MESSAGE_TYPE_ROTATION {
+                // COLD PATH
+                debug!("Received rotation message");
+                self.handle_rotate_message(buffer.buffer())?;
+                buffer.clear();
+                Ok(MessageResult::None)
+            } else {
+                Ok(MessageResult::Message(msg_type))
+            }
+        }
+    }
+
+    pub fn send_message(&mut self, type_: u8, buffer: &mut MsgBuffer) -> Result<(), Error> {
+        // HOT PATH
+        assert_ne!(type_, MESSAGE_TYPE_ROTATION);
+        buffer.prepend_byte(type_);
+        self.encrypt_message(buffer)
+    }
+
+    pub fn every_second(&mut self, out: &mut MsgBuffer) -> Result<MessageResult<P>, Error> {
+        out.clear();
+        if let Some(ref mut core) = self.core {
+            core.every_second()
+        }
+        if let Some(ref mut init) = self.init {
+            init.every_second(out)?;
+        }
+        if self.init.as_ref().map(|i| i.stage()).unwrap_or(CLOSING) == CLOSING {
+            self.init = None
+        }
+        if !out.is_empty() {
+            out.prepend_byte(INIT_MESSAGE_FIRST_BYTE);
+            return Ok(MessageResult::Reply);
+        }
+        if let Some(ref mut rotate) = self.rotation {
+            self.rotate_counter += 1;
+            if self.rotate_counter >= ROTATE_INTERVAL {
+                self.rotate_counter = 0;
+                if let Some(rot) = rotate.cycle(out) {
+                    let core = self.get_core()?;
+                    let algo = core.algorithm();
+                    let key = LessSafeKey::new(UnboundKey::new(algo, &rot.key[..algo.key_len()]).unwrap());
+                    core.rotate_key(key, rot.id, rot.use_for_sending);
+                }
+                if !out.is_empty() {
+                    out.prepend_byte(MESSAGE_TYPE_ROTATION);
+                    self.encrypt_message(out)?;
+                    return Ok(MessageResult::Reply);
+                }
+            }
+        }
+        Ok(MessageResult::None)
+    }
+}
+
+pub fn is_init_message(msg: &[u8]) -> bool {
+    // HOT PATH
+    !msg.is_empty() && msg[0] == INIT_MESSAGE_FIRST_BYTE
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    use crate::types::NODE_ID_BYTES;
+
+    fn create_node(config: &Config) -> PeerCrypto<Vec<u8>> {
+        let rng = SystemRandom::new();
+        let mut node_id = [0; NODE_ID_BYTES];
+        rng.fill(&mut node_id).unwrap();
+        let crypto = Crypto::new(node_id, config).unwrap();
+        crypto.peer_instance(vec![])
+    }
+
+    #[test]
+    fn normal() {
+        let config = Config { password: Some("test".to_string()), ..Default::default() };
+        let mut node1 = create_node(&config);
+        let mut node2 = create_node(&config);
+        let mut msg = MsgBuffer::new(16);
+
+        node1.initialize(&mut msg).unwrap();
+        assert!(!msg.is_empty());
+
+        debug!("Node1 -> Node2");
+        let res = node2.handle_message(&mut msg).unwrap();
+        assert_eq!(res, MessageResult::Reply);
+        assert!(!msg.is_empty());
+
+        debug!("Node1 <- Node2");
+        let res = node1.handle_message(&mut msg).unwrap();
+        assert_eq!(res, MessageResult::InitializedWithReply(vec![]));
+        assert!(!msg.is_empty());
+
+        debug!("Node1 -> Node2");
+        let res = node2.handle_message(&mut msg).unwrap();
+        assert_eq!(res, MessageResult::InitializedWithReply(vec![]));
+        assert!(!msg.is_empty());
+
+        debug!("Node1 <- Node2");
+        let res = node1.handle_message(&mut msg).unwrap();
+        assert_eq!(res, MessageResult::None);
+        assert!(msg.is_empty());
+
+        let mut buffer = MsgBuffer::new(16);
+        let rng = SystemRandom::new();
+        buffer.set_length(1000);
+        rng.fill(buffer.message_mut()).unwrap();
+        for _ in 0..1000 {
+            node1.send_message(1, &mut buffer).unwrap();
+            let res = node2.handle_message(&mut buffer).unwrap();
+            assert_eq!(res, MessageResult::Message(1));
+
+            match node1.every_second(&mut msg).unwrap() {
+                MessageResult::None => (),
+                MessageResult::Reply => {
+                    let res = node2.handle_message(&mut msg).unwrap();
+                    assert_eq!(res, MessageResult::None);
+                }
+                other => assert_eq!(other, MessageResult::None),
+            }
+            match node2.every_second(&mut msg).unwrap() {
+                MessageResult::None => (),
+                MessageResult::Reply => {
+                    let res = node1.handle_message(&mut msg).unwrap();
+                    assert_eq!(res, MessageResult::None);
+                }
+                other => assert_eq!(other, MessageResult::None),
+            }
+        }
+    }
+}

src/crypto/core.rs

@@ -0,0 +1,453 @@
+// VpnCloud - Peer-to-Peer VPN
+// Copyright (C) 2015-2021  Dennis Schwerdel
+// This software is licensed under GPL-3 or newer (see LICENSE.md)
+
+// This module implements a crypto core for encrypting and decrypting message streams
+//
+// The crypto core only encrypts and decrypts messages, using given keys. Negotiating and rotating the keys is out of
+// scope of the crypto core. The crypto core assumes that the remote node will always have the necessary key to decrypt
+// the message.
+//
+// The crypto core encrypts messages in place, writes some extra data (key id and nonce) into a given space and
+// includes the given header data in the authentication tag. When decrypting messages, the crypto core reads the extra
+// data, uses the key id to find the right key to decrypting the message and then decrypts the message, using the given
+// nonce and including the given header data in the verification of the authentication tag.
+//
+// While the core only uses a single key at a time for encrypting messages, it is ready to decrypt messages based on
+// one of 4 stored keys (the encryption key being one of them). An external key rotation is responsible for adding the
+// key to the remote peer before switching to the key on the local peer for encryption.
+//
+// As mentioned, the encryption and decryption works in place. Therefore the parameter payload_and_tag contains (when
+// decrypting) or provides space for (when encrypting) the payload and the authentication tag. When encrypting, that
+// means, that the last TAG_LEN bytes of payload_and_tag must be reserved for the tag and must not contain payload
+// bytes.
+//
+// The nonce is a value of 12 bytes (192 bits). Since both nodes can use the same key for encryption, the most
+// significant byte (msb) of the nonce is initialized differently on both peers: one peer uses the value 0x00 and the
+// other one 0x80. That means that the nonce space is essentially divided in two halves, one for each node.
+//
+// To save space and keep the encrypted data aligned to 64 bits, not all bytes of the nonce are transferred. Instead,
+// only 7 bytes are included in messages (another byte is used for the key id, hence 64 bit alignment). The rest of the
+// nonce is deduced by the nodes: All other bytes are assumed to be 0x00, except for the most significant byte, which
+// is assumed to be the opposite ones own msb. This has two nice effects:
+// 1) Long before the nonce could theoretically repeat, the messages can no longer be decrypted by the peer as the
+// higher bytes are no longer zero as assumed.
+// 2) By deducing the msb to be the opposite of ones own msb, it is no longer possible for an attacker to redirect a
+// message back to the sender because then the assumed nonce will be wrong and the message fails to decrypt. Otherwise,
+// this could lead to problems as nodes would be able to accidentally decrypt their own messages.
+//
+// In order to be resistent against replay attacks but allow for reordering of messages, the crypto core uses nonce
+// pinning. For every active key, the biggest nonce seen so far is being tracked. Every second, the biggest nonce seen
+// one second ago plus 1 becomes the minimum nonce that is accepted for that key. That means, that reordering can
+// happen within one second but after a second, old messages will not be accepted anymore.
+
+use byteorder::{ReadBytesExt, WriteBytesExt};
+use ring::{
+    aead::{self, LessSafeKey, UnboundKey},
+    rand::{SecureRandom, SystemRandom},
+};
+
+use std::{
+    io::{Cursor, Read, Write},
+    mem,
+    time::{Duration, Instant},
+};
+
+use crate::{error::Error, util::MsgBuffer};
+
+const NONCE_LEN: usize = 12;
+pub const TAG_LEN: usize = 16;
+pub const EXTRA_LEN: usize = 8;
+
+fn random_data(size: usize) -> Vec<u8> {
+    let rand = SystemRandom::new();
+    let mut data = vec![0; size];
+    rand.fill(&mut data).expect("Failed to obtain random bytes");
+    data
+}
+
+#[derive(PartialOrd, Ord, PartialEq, Debug, Eq, Clone)]
+struct Nonce([u8; NONCE_LEN]);
+
+impl Nonce {
+    fn zero() -> Self {
+        Nonce([0; NONCE_LEN])
+    }
+
+    fn random(rand: &SystemRandom) -> Self {
+        let mut nonce = Nonce::zero();
+        rand.fill(&mut nonce.0[6..]).expect("Failed to obtain random bytes");
+        nonce
+    }
+
+    fn set_msb(&mut self, val: u8) {
+        self.0[0] = val
+    }
+
+    fn as_bytes(&self) -> &[u8; NONCE_LEN] {
+        &self.0
+    }
+
+    fn increment(&mut self) {
+        for i in (0..NONCE_LEN).rev() {
+            let mut num = self.0[i];
+            num = num.wrapping_add(1);
+            self.0[i] = num;
+            if num > 0 {
+                return;
+            }
+        }
+    }
+}
+
+struct CryptoKey {
+    key: LessSafeKey,
+    send_nonce: Nonce,
+    min_nonce: Nonce,
+    next_min_nonce: Nonce,
+    seen_nonce: Nonce,
+}
+
+impl CryptoKey {
+    fn new(rand: &SystemRandom, key: LessSafeKey, nonce_half: bool) -> Self {
+        let mut send_nonce = Nonce::random(rand);
+        send_nonce.set_msb(if nonce_half { 0x80 } else { 0x00 });
+        CryptoKey {
+            key,
+            send_nonce,
+            min_nonce: Nonce::zero(),
+            next_min_nonce: Nonce::zero(),
+            seen_nonce: Nonce::zero(),
+        }
+    }
+
+    fn update_min_nonce(&mut self) {
+        mem::swap(&mut self.min_nonce, &mut self.next_min_nonce);
+        self.next_min_nonce = self.seen_nonce.clone();
+        self.next_min_nonce.increment();
+    }
+}
+
+pub struct CryptoCore {
+    rand: SystemRandom,
+    keys: [CryptoKey; 4],
+    current_key: usize,
+    nonce_half: bool,
+}
+
+impl CryptoCore {
+    pub fn new(key: LessSafeKey, nonce_half: bool) -> Self {
+        let rand = SystemRandom::new();
+        let dummy_key_data = random_data(key.algorithm().key_len());
+        let dummy_key1 = LessSafeKey::new(UnboundKey::new(key.algorithm(), &dummy_key_data).unwrap());
+        let dummy_key2 = LessSafeKey::new(UnboundKey::new(key.algorithm(), &dummy_key_data).unwrap());
+        let dummy_key3 = LessSafeKey::new(UnboundKey::new(key.algorithm(), &dummy_key_data).unwrap());
+        Self {
+            keys: [
+                CryptoKey::new(&rand, key, nonce_half),
+                CryptoKey::new(&rand, dummy_key1, nonce_half),
+                CryptoKey::new(&rand, dummy_key2, nonce_half),
+                CryptoKey::new(&rand, dummy_key3, nonce_half),
+            ],
+            current_key: 0,
+            nonce_half,
+            rand,
+        }
+    }
+
+    pub fn encrypt(&mut self, buffer: &mut MsgBuffer) {
+        let data_start = buffer.get_start();
+        let data_length = buffer.len();
+        assert!(buffer.get_start() >= EXTRA_LEN);
+        buffer.set_start(data_start - EXTRA_LEN);
+        buffer.set_length(data_length + EXTRA_LEN + TAG_LEN);
+        let (extra, data_and_tag) = buffer.message_mut().split_at_mut(EXTRA_LEN);
+        let (data, tag_space) = data_and_tag.split_at_mut(data_length);
+        let key = &mut self.keys[self.current_key];
+        key.send_nonce.increment();
+        {
+            let mut extra = Cursor::new(extra);
+            extra.write_u8(self.current_key as u8).unwrap();
+            extra.write_all(&key.send_nonce.as_bytes()[5..]).unwrap();
+        }
+        let nonce = aead::Nonce::assume_unique_for_key(*key.send_nonce.as_bytes());
+        let tag = key.key.seal_in_place_separate_tag(nonce, aead::Aad::empty(), data).expect("Failed to encrypt");
+        tag_space.clone_from_slice(tag.as_ref());
+    }
+
+    fn decrypt_with_key(key: &mut CryptoKey, nonce: Nonce, data_and_tag: &mut [u8]) -> Result<(), Error> {
+        if nonce < key.min_nonce {
+            return Err(Error::Crypto("Old nonce rejected"));
+        }
+        // decrypt
+        let crypto_nonce = aead::Nonce::assume_unique_for_key(*nonce.as_bytes());
+        key.key
+            .open_in_place(crypto_nonce, aead::Aad::empty(), data_and_tag)
+            .map_err(|_| Error::Crypto("Failed to decrypt data"))?;
+        // last seen nonce
+        if key.seen_nonce < nonce {
+            key.seen_nonce = nonce;
+        }
+        Ok(())
+    }
+
+    pub fn decrypt(&mut self, buffer: &mut MsgBuffer) -> Result<(), Error> {
+        assert!(buffer.len() >= EXTRA_LEN + TAG_LEN);
+        let (extra, data_and_tag) = buffer.message_mut().split_at_mut(EXTRA_LEN);
+        let key_id;
+        let mut nonce;
+        {
+            let mut extra = Cursor::new(extra);
+            key_id = extra.read_u8().map_err(|_| Error::Crypto("Input data too short"))? % 4;
+            nonce = Nonce::zero();
+            extra.read_exact(&mut nonce.0[5..]).map_err(|_| Error::Crypto("Input data too short"))?;
+            nonce.set_msb(if self.nonce_half { 0x00 } else { 0x80 });
+        }
+        let key = &mut self.keys[key_id as usize];
+        let result = Self::decrypt_with_key(key, nonce, data_and_tag);
+        buffer.set_start(buffer.get_start() + EXTRA_LEN);
+        buffer.set_length(buffer.len() - TAG_LEN);
+        result
+    }
+
+    pub fn rotate_key(&mut self, key: LessSafeKey, id: u64, use_for_sending: bool) {
+        debug!("Rotated key {} (use for sending: {})", id, use_for_sending);
+        let id = (id % 4) as usize;
+        self.keys[id] = CryptoKey::new(&self.rand, key, self.nonce_half);
+        if use_for_sending {
+            self.current_key = id
+        }
+    }
+
+    pub fn algorithm(&self) -> &'static aead::Algorithm {
+        self.keys[self.current_key].key.algorithm()
+    }
+
+    pub fn every_second(&mut self) {
+        // Set min nonce on all keys
+        for k in &mut self.keys {
+            k.update_min_nonce();
+        }
+    }
+}
+
+pub fn create_dummy_pair(algo: &'static aead::Algorithm) -> (CryptoCore, CryptoCore) {
+    let key_data = random_data(algo.key_len());
+    let sender = CryptoCore::new(LessSafeKey::new(UnboundKey::new(algo, &key_data).unwrap()), true);
+    let receiver = CryptoCore::new(LessSafeKey::new(UnboundKey::new(algo, &key_data).unwrap()), false);
+    (sender, receiver)
+}
+
+pub fn test_speed(algo: &'static aead::Algorithm, max_time: &Duration) -> f64 {
+    let mut buffer = MsgBuffer::new(EXTRA_LEN);
+    buffer.set_length(1000);
+    let (mut sender, mut receiver) = create_dummy_pair(algo);
+    let mut iterations = 0;
+    let start = Instant::now();
+    while (Instant::now() - start).as_nanos() < max_time.as_nanos() {
+        for _ in 0..1000 {
+            sender.encrypt(&mut buffer);
+            receiver.decrypt(&mut buffer).unwrap();
+        }
+        iterations += 1000;
+    }
+    let duration = (Instant::now() - start).as_secs_f64();
+    let data = iterations * 1000 * 2;
+    data as f64 / duration / 1_000_000.0
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use ring::aead::{self, LessSafeKey, UnboundKey};
+
+    #[test]
+    fn test_nonce() {
+        let mut nonce = Nonce::zero();
+        assert_eq!(nonce.as_bytes(), &[0; 12]);
+        nonce.increment();
+        assert_eq!(nonce.as_bytes(), &[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1]);
+        nonce.increment();
+        assert_eq!(nonce.as_bytes(), &[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2]);
+    }
+
+    fn test_encrypt_decrypt(algo: &'static aead::Algorithm) {
+        let (mut sender, mut receiver) = create_dummy_pair(algo);
+        let plain = random_data(1000);
+        let mut buffer = MsgBuffer::new(EXTRA_LEN);
+        buffer.clone_from(&plain);
+        assert_eq!(&plain[..], buffer.message());
+        sender.encrypt(&mut buffer);
+        assert_ne!(&plain[..], buffer.message());
+        receiver.decrypt(&mut buffer).unwrap();
+        assert_eq!(&plain[..], buffer.message());
+    }
+
+    #[test]
+    fn test_encrypt_decrypt_aes128() {
+        test_encrypt_decrypt(&aead::AES_128_GCM)
+    }
+
+    #[test]
+    fn test_encrypt_decrypt_aes256() {
+        test_encrypt_decrypt(&aead::AES_256_GCM)
+    }
+
+    #[test]
+    fn test_encrypt_decrypt_chacha() {
+        test_encrypt_decrypt(&aead::CHACHA20_POLY1305)
+    }
+
+    fn test_tampering(algo: &'static aead::Algorithm) {
+        let (mut sender, mut receiver) = create_dummy_pair(algo);
+        let plain = random_data(1000);
+        let mut buffer = MsgBuffer::new(EXTRA_LEN);
+        buffer.clone_from(&plain);
+        sender.encrypt(&mut buffer);
+        let mut d = buffer.clone();
+        assert!(receiver.decrypt(&mut d,).is_ok());
+        // Tamper with extra data byte 1 (subkey id)
+        d = buffer.clone();
+        d.message_mut()[0] ^= 1;
+        assert!(receiver.decrypt(&mut d).is_err());
+        // Tamper with extra data byte 2 (nonce)
+        d = buffer.clone();
+        d.message_mut()[1] ^= 1;
+        assert!(receiver.decrypt(&mut d).is_err());
+        // Tamper with data itself
+        d = buffer.clone();
+        d.message_mut()[EXTRA_LEN] ^= 1;
+        assert!(receiver.decrypt(&mut d).is_err());
+        // Check everything still works
+        d = buffer;
+        assert!(receiver.decrypt(&mut d).is_ok());
+    }
+
+    #[test]
+    fn test_tampering_aes128() {
+        test_tampering(&aead::AES_128_GCM)
+    }
+
+    #[test]
+    fn test_tampering_aes256() {
+        test_tampering(&aead::AES_256_GCM)
+    }
+
+    #[test]
+    fn test_tampering_chacha() {
+        test_tampering(&aead::CHACHA20_POLY1305)
+    }
+
+    fn test_nonce_pinning(algo: &'static aead::Algorithm) {
+        let (mut sender, mut receiver) = create_dummy_pair(algo);
+        let plain = random_data(1000);
+        let mut buffer = MsgBuffer::new(EXTRA_LEN);
+        buffer.clone_from(&plain);
+        sender.encrypt(&mut buffer);
+        {
+            let mut d = buffer.clone();
+            assert!(receiver.decrypt(&mut d).is_ok());
+        }
+        receiver.every_second();
+        {
+            let mut d = buffer.clone();
+            assert!(receiver.decrypt(&mut d).is_ok());
+        }
+        receiver.every_second();
+        {
+            let mut d = buffer;
+            assert!(receiver.decrypt(&mut d).is_err());
+        }
+        let mut buffer = MsgBuffer::new(EXTRA_LEN);
+        buffer.clone_from(&plain);
+        sender.encrypt(&mut buffer);
+        assert!(receiver.decrypt(&mut buffer).is_ok());
+    }
+
+    #[test]
+    fn test_nonce_pinning_aes128() {
+        test_nonce_pinning(&aead::AES_128_GCM)
+    }
+
+    #[test]
+    fn test_nonce_pinning_aes256() {
+        test_nonce_pinning(&aead::AES_256_GCM)
+    }
+
+    #[test]
+    fn test_nonce_pinning_chacha() {
+        test_nonce_pinning(&aead::CHACHA20_POLY1305)
+    }
+
+    fn test_key_rotation(algo: &'static aead::Algorithm) {
+        let (mut sender, mut receiver) = create_dummy_pair(algo);
+        let plain = random_data(1000);
+        let mut buffer = MsgBuffer::new(EXTRA_LEN);
+        buffer.clone_from(&plain);
+
+        sender.encrypt(&mut buffer);
+        assert!(receiver.decrypt(&mut buffer).is_ok());
+
+        let new_key = random_data(algo.key_len());
+        receiver.rotate_key(LessSafeKey::new(UnboundKey::new(algo, &new_key).unwrap()), 1, false);
+        receiver.encrypt(&mut buffer);
+        assert!(sender.decrypt(&mut buffer).is_ok());
+        sender.encrypt(&mut buffer);
+        assert!(receiver.decrypt(&mut buffer).is_ok());
+        sender.rotate_key(LessSafeKey::new(UnboundKey::new(algo, &new_key).unwrap()), 1, true);
+        receiver.encrypt(&mut buffer);
+        assert!(sender.decrypt(&mut buffer).is_ok());
+        sender.encrypt(&mut buffer);
+        assert!(receiver.decrypt(&mut buffer).is_ok());
+        let new_key = random_data(algo.key_len());
+        sender.rotate_key(LessSafeKey::new(UnboundKey::new(algo, &new_key).unwrap()), 2, true);
+        sender.encrypt(&mut buffer);
+        assert!(receiver.decrypt(&mut buffer).is_err());
+        receiver.encrypt(&mut buffer);
+        assert!(sender.decrypt(&mut buffer).is_ok());
+
+        receiver.rotate_key(LessSafeKey::new(UnboundKey::new(algo, &new_key).unwrap()), 2, false);
+        receiver.encrypt(&mut buffer);
+        assert!(sender.decrypt(&mut buffer).is_ok());
+        sender.encrypt(&mut buffer);
+        assert!(receiver.decrypt(&mut buffer).is_ok());
+    }
+
+    #[test]
+    fn test_key_rotation_aes128() {
+        test_key_rotation(&aead::AES_128_GCM);
+    }
+
+    #[test]
+    fn test_key_rotation_aes256() {
+        test_key_rotation(&aead::AES_256_GCM);
+    }
+
+    #[test]
+    fn test_key_rotation_chacha() {
+        test_key_rotation(&aead::CHACHA20_POLY1305);
+    }
+
+    #[test]
+    fn test_core_size() {
+        assert_eq!(2384, mem::size_of::<CryptoCore>());
+    }
+
+    #[test]
+    fn test_speed_aes128() {
+        let speed = test_speed(&aead::AES_128_GCM, &Duration::from_secs_f32(0.2));
+        assert!(speed > 10.0);
+    }
+
+    #[test]
+    fn test_speed_aes256() {
+        let speed = test_speed(&aead::AES_256_GCM, &Duration::from_secs_f32(0.2));
+        assert!(speed > 10.0);
+    }
+
+    #[test]
+    fn test_speed_chacha() {
+        let speed = test_speed(&aead::CHACHA20_POLY1305, &Duration::from_secs_f32(0.2));
+        assert!(speed > 10.0);
+    }
+}

src/crypto/init.rs

@@ -0,0 +1,929 @@
+// VpnCloud - Peer-to-Peer VPN
+// Copyright (C) 2015-2021  Dennis Schwerdel
+// This software is licensed under GPL-3 or newer (see LICENSE.md)
+
+// This module implements a 3-way handshake to initialize an authenticated and encrypted connection.
+//
+// The handshake assumes that each node has a asymmetric Curve 25519 key pair as well as a list of trusted public keys
+// and a set of supported crypto algorithms as well as the expected speed when using them. If successful, the handshake
+// will negotiate a crypto algorithm to use and a common ephemeral symmetric key and exchange a given payload between
+// the nodes.
+//
+// The handshake consists of 3 stages, "ping", "pong" and "peng". In the following description, the node that initiates
+// the connection is named "A" and the other node is named "B". Since a lot of things are going on in parallel in the
+// handshake, those aspects are described separately in the following paragraphs.
+//
+// Every message contains the node id of the sender. If a node receives a message with its own node id, it just ignores
+// it and closes the connection. This is the way nodes avoid to connect to themselves as it is not trivial for a node
+// to know its own addresses (especially in the case of NAT).
+//
+// All initialization messages are signed by the asymmetric key of the sender. Also the messages indicate the public
+// key being used, so the receiver can use the correct public key to verify the signature. The public key itself is not
+// attached to the message for privacy reasons (the public key is stable over multiple restarts while the node id is
+// only valid for a single run). Instead, a 2 byte salt value as well as the last 2 bytes of the salted sha 2 hash of
+// the public key are used to identify the public key. This way, a receiver that trusts this public key can identify
+// it but a random observer can't. If the public key is unknown or the signature can't be verified, the message is
+// ignored.
+//
+// Every message contains a byte that specifies the stage (ping = 1, pong = 2, peng = 3). If a message with an
+// unexpected stage is received, it is ignored and the last message that has been sent is repeated. There is only one
+// exception to this rule: if a "pong" message is expected, but a "ping" message is received instead AND the node id of
+// the sender is greater than the node id of the receiver, the receiving node will reset its state and assume the role
+// of a receiver of the initialization (i.e. "B"). This is used to "negotiate" the roles A and B when both nodes
+// initiate the connection in parallel and think they are A.
+//
+// Upon connection creation, both nodes create a random ephemeral ECDH key pair and exchange the public keys in the
+// ping and pong messages. A sends the ping message to B containing A's public key and B replies with a pong message
+// containing B's public key. That means, that after receiving the ping message B can calculate the shared key material
+// and after receiving the pong message A can calculate the shared key material.
+//
+// The ping message and the pong message contain a set of supported crypto algorithms together with the estimated
+// speeds of the algorithms. When B receives a ping message, or A receives a pong message, it can combine this
+// information with its own algorithm list and select the algorithm with the best expected speed for the crypto core.
+//
+// The pong and peng message contain the payload that the nodes want to exchange in the initialization phase apart from
+// the cryptographic initialization. This payload is encoded according to the application and encrypted using the key
+// material and the crypto algorithm that have been negotiated via the ping and pong messages. The pong message,
+// therefore contains information to set up symmetric encryption as well as a part that is already encrypted.
+//
+// The handshake ends for A after sending the peng message and for B after receiving this message. At this time both
+// nodes initialize the connection using the payload and enter normal operation. The negotiated crypto core is used for
+// future communication and the key rotation is started. Since the peng message can be lost, A needs to keep the
+// initialization state in order to repeat a lost peng message. After one second, A removes that state.
+//
+// Once every second, both nodes check whether they have already finished the initialization. If not, they repeat their
+// last message. After 5 seconds, the initialization is aborted as failed.
+
+use super::{
+    core::{CryptoCore, EXTRA_LEN},
+    Algorithms, EcdhPrivateKey, EcdhPublicKey, Ed25519PublicKey, Payload,
+};
+use crate::{error::Error, types::NodeId, util::MsgBuffer};
+use byteorder::{NetworkEndian, ReadBytesExt, WriteBytesExt};
+use ring::{
+    aead::{Algorithm, LessSafeKey, UnboundKey, AES_128_GCM, AES_256_GCM, CHACHA20_POLY1305},
+    agreement::{agree_ephemeral, X25519},
+    digest,
+    rand::{SecureRandom, SystemRandom},
+    signature::{self, Ed25519KeyPair, KeyPair, ED25519, ED25519_PUBLIC_KEY_LEN},
+};
+use smallvec::{smallvec, SmallVec};
+use std::{
+    cmp, f32,
+    fmt::Debug,
+    io::{self, Cursor, Read, Write},
+    sync::Arc,
+};
+
+pub const STAGE_PING: u8 = 1;
+pub const STAGE_PONG: u8 = 2;
+pub const STAGE_PENG: u8 = 3;
+pub const WAITING_TO_CLOSE: u8 = 4;
+pub const CLOSING: u8 = 5;
+
+pub const MAX_FAILED_RETRIES: usize = 120;
+
+pub const SALTED_NODE_ID_HASH_LEN: usize = 20;
+pub type SaltedNodeIdHash = [u8; SALTED_NODE_ID_HASH_LEN];
+
+#[allow(clippy::large_enum_variant)]
+pub enum InitMsg {
+    Ping {
+        salted_node_id_hash: SaltedNodeIdHash,
+        ecdh_public_key: EcdhPublicKey,
+        algorithms: Algorithms,
+    },
+    Pong {
+        salted_node_id_hash: SaltedNodeIdHash,
+        ecdh_public_key: EcdhPublicKey,
+        algorithms: Algorithms,
+        encrypted_payload: MsgBuffer,
+    },
+    Peng {
+        salted_node_id_hash: SaltedNodeIdHash,
+        encrypted_payload: MsgBuffer,
+    },
+}
+
+impl InitMsg {
+    const PART_ALGORITHMS: u8 = 4;
+    const PART_ECDH_PUBLIC_KEY: u8 = 3;
+    const PART_END: u8 = 0;
+    const PART_PAYLOAD: u8 = 5;
+    const PART_SALTED_NODE_ID_HASH: u8 = 2;
+    const PART_STAGE: u8 = 1;
+
+    fn stage(&self) -> u8 {
+        match self {
+            InitMsg::Ping { .. } => STAGE_PING,
+            InitMsg::Pong { .. } => STAGE_PONG,
+            InitMsg::Peng { .. } => STAGE_PENG,
+        }
+    }
+
+    fn salted_node_id_hash(&self) -> &SaltedNodeIdHash {
+        match self {
+            InitMsg::Ping { salted_node_id_hash, .. }
+            | InitMsg::Pong { salted_node_id_hash, .. }
+            | InitMsg::Peng { salted_node_id_hash, .. } => salted_node_id_hash,
+        }
+    }
+
+    fn calculate_hash(key: &Ed25519PublicKey, salt: &[u8; 4]) -> [u8; 4] {
+        let mut data = [0; ED25519_PUBLIC_KEY_LEN + 4];
+        data[..ED25519_PUBLIC_KEY_LEN].clone_from_slice(key);
+        data[ED25519_PUBLIC_KEY_LEN..].clone_from_slice(salt);
+        let hash = digest::digest(&digest::SHA256, &data);
+        let mut short_hash = [0; 4];
+        short_hash.clone_from_slice(&hash.as_ref()[..4]);
+        short_hash
+    }
+
+    fn read_from(buffer: &[u8], trusted_keys: &[Ed25519PublicKey]) -> Result<(Self, Ed25519PublicKey), Error> {
+        let mut r = Cursor::new(buffer);
+
+        let mut public_key_salt = [0; 4];
+        r.read_exact(&mut public_key_salt).map_err(|_| Error::Parse("Init message too short"))?;
+        let mut public_key_hash = [0; 4];
+        r.read_exact(&mut public_key_hash).map_err(|_| Error::Parse("Init message too short"))?;
+        let mut public_key_data = [0; ED25519_PUBLIC_KEY_LEN];
+        let mut found_key = false;
+        for tk in trusted_keys {
+            if Self::calculate_hash(tk, &public_key_salt) == public_key_hash {
+                public_key_data.clone_from_slice(tk);
+                found_key = true;
+                break;
+            }
+        }
+        if !found_key {
+            return Err(Error::Crypto("untrusted peer"));
+        }
+
+        let mut stage = None;
+        let mut salted_node_id_hash = None;
+        let mut ecdh_public_key = None;
+        let mut encrypted_payload = None;
+        let mut algorithms = None;
+
+        loop {
+            let field = r.read_u8().map_err(|_| Error::Parse("Init message too short"))?;
+            if field == Self::PART_END {
+                break;
+            }
+            let field_len = r.read_u16::<NetworkEndian>().map_err(|_| Error::Parse("Init message too short"))? as usize;
+            match field {
+                Self::PART_STAGE => {
+                    if field_len != 1 {
+                        return Err(Error::CryptoInit("Invalid size for stage field"));
+                    }
+                    stage = Some(r.read_u8().map_err(|_| Error::Parse("Init message too short"))?)
+                }
+                Self::PART_SALTED_NODE_ID_HASH => {
+                    if field_len != SALTED_NODE_ID_HASH_LEN {
+                        return Err(Error::CryptoInit("Invalid size for salted node id hash field"));
+                    }
+                    let mut id = [0; SALTED_NODE_ID_HASH_LEN];
+                    r.read_exact(&mut id).map_err(|_| Error::Parse("Init message too short"))?;
+                    salted_node_id_hash = Some(id)
+                }
+                Self::PART_ECDH_PUBLIC_KEY => {
+                    let mut pub_key_data = smallvec![0; field_len];
+                    r.read_exact(&mut pub_key_data).map_err(|_| Error::Parse("Init message too short"))?;
+                    ecdh_public_key = Some(EcdhPublicKey::new(&X25519, pub_key_data));
+                }
+                Self::PART_PAYLOAD => {
+                    let mut payload = MsgBuffer::new(0);
+                    payload.set_length(field_len);
+                    r.read_exact(payload.message_mut()).map_err(|_| Error::Parse("Init message too short"))?;
+                    encrypted_payload = Some(payload);
+                }
+                Self::PART_ALGORITHMS => {
+                    let count = field_len / 5;
+                    let mut algos = SmallVec::with_capacity(count);
+                    let mut allow_unencrypted = false;
+                    for _ in 0..count {
+                        let algo = match r.read_u8().map_err(|_| Error::Parse("Init message too short"))? {
+                            0 => {
+                                allow_unencrypted = true;
+                                None
+                            }
+                            1 => Some(&AES_128_GCM),
+                            2 => Some(&AES_256_GCM),
+                            3 => Some(&CHACHA20_POLY1305),
+                            _ => None,
+                        };
+                        let speed =
+                            r.read_f32::<NetworkEndian>().map_err(|_| Error::Parse("Init message too short"))?;
+                        if let Some(algo) = algo {
+                            algos.push((algo, speed));
+                        }
+                    }
+                    algorithms = Some(Algorithms { algorithm_speeds: algos, allow_unencrypted });
+                }
+                _ => {
+                    let mut data = vec![0; field_len];
+                    r.read_exact(&mut data).map_err(|_| Error::Parse("Init message too short"))?;
+                }
+            }
+        }
+
+        let pos = r.position() as usize;
+
+        let signature_len = r.read_u8().map_err(|_| Error::Parse("Init message too short"))? as usize;
+        let mut signature: SmallVec<[u8; 32]> = smallvec![0; signature_len];
+        r.read_exact(&mut signature).map_err(|_| Error::Parse("Init message too short"))?;
+
+        let signed_data = &r.into_inner()[0..pos];
+        let public_key = signature::UnparsedPublicKey::new(&ED25519, &public_key_data);
+        if public_key.verify(signed_data, &signature).is_err() {
+            return Err(Error::Crypto("invalid signature"));
+        }
+
+        let stage = match stage {
+            Some(val) => val,
+            None => return Err(Error::CryptoInit("Init message without stage")),
+        };
+        let salted_node_id_hash = match salted_node_id_hash {
+            Some(val) => val,
+            None => return Err(Error::CryptoInit("Init message without node id")),
+        };
+
+        let msg = match stage {
+            STAGE_PING => {
+                let ecdh_public_key = match ecdh_public_key {
+                    Some(val) => val,
+                    None => return Err(Error::CryptoInit("Init message without ecdh public key")),
+                };
+                let algorithms = match algorithms {
+                    Some(val) => val,
+                    None => return Err(Error::CryptoInit("Init message without algorithms")),
+                };
+                Self::Ping { salted_node_id_hash, ecdh_public_key, algorithms }
+            }
+            STAGE_PONG => {
+                let ecdh_public_key = match ecdh_public_key {
+                    Some(val) => val,
+                    None => return Err(Error::CryptoInit("Init message without ecdh public key")),
+                };
+                let algorithms = match algorithms {
+                    Some(val) => val,
+                    None => return Err(Error::CryptoInit("Init message without algorithms")),
+                };
+                let encrypted_payload = match encrypted_payload {
+                    Some(val) => val,
+                    None => return Err(Error::CryptoInit("Init message without payload")),
+                };
+                Self::Pong { salted_node_id_hash, ecdh_public_key, algorithms, encrypted_payload }
+            }
+            STAGE_PENG => {
+                let encrypted_payload = match encrypted_payload {
+                    Some(val) => val,
+                    None => return Err(Error::CryptoInit("Init message without payload")),
+                };
+                Self::Peng { salted_node_id_hash, encrypted_payload }
+            }
+            _ => return Err(Error::CryptoInit("Invalid stage")),
+        };
+
+        Ok((msg, public_key_data))
+    }
+
+    fn write_to(&self, buffer: &mut [u8], key: &Ed25519KeyPair) -> Result<usize, io::Error> {
+        let mut w = Cursor::new(buffer);
+
+        let rand = SystemRandom::new();
+        let mut salt = [0; 4];
+        rand.fill(&mut salt).unwrap();
+        let mut public_key = [0; ED25519_PUBLIC_KEY_LEN];
+        public_key.clone_from_slice(key.public_key().as_ref());
+        let hash = Self::calculate_hash(&public_key, &salt);
+        w.write_all(&salt)?;
+        w.write_all(&hash)?;
+
+        w.write_u8(Self::PART_STAGE)?;
+        w.write_u16::<NetworkEndian>(1)?;
+        w.write_u8(self.stage())?;
+
+        match &self {
+            Self::Ping { salted_node_id_hash, .. }
+            | Self::Pong { salted_node_id_hash, .. }
+            | Self::Peng { salted_node_id_hash, .. } => {
+                w.write_u8(Self::PART_SALTED_NODE_ID_HASH)?;
+                w.write_u16::<NetworkEndian>(SALTED_NODE_ID_HASH_LEN as u16)?;
+                w.write_all(salted_node_id_hash)?;
+            }
+        }
+
+        match &self {
+            Self::Ping { ecdh_public_key, .. } | Self::Pong { ecdh_public_key, .. } => {
+                w.write_u8(Self::PART_ECDH_PUBLIC_KEY)?;
+                let key_bytes = ecdh_public_key.bytes();
+                w.write_u16::<NetworkEndian>(key_bytes.len() as u16)?;
+                w.write_all(key_bytes)?;
+            }
+            _ => (),
+        }
+
+        match &self {
+            Self::Ping { algorithms, .. } | Self::Pong { algorithms, .. } => {
+                w.write_u8(Self::PART_ALGORITHMS)?;
+                let mut len = algorithms.algorithm_speeds.len() * 5;
+                if algorithms.allow_unencrypted {
+                    len += 5;
+                }
+                w.write_u16::<NetworkEndian>(len as u16)?;
+                if algorithms.allow_unencrypted {
+                    w.write_u8(0)?;
+                    w.write_f32::<NetworkEndian>(f32::INFINITY)?;
+                }
+                for (algo, speed) in &algorithms.algorithm_speeds {
+                    if *algo == &AES_128_GCM {
+                        w.write_u8(1)?;
+                    } else if *algo == &AES_256_GCM {
+                        w.write_u8(2)?;
+                    } else if *algo == &CHACHA20_POLY1305 {
+                        w.write_u8(3)?;
+                    } else {
+                        unreachable!();
+                    }
+                    w.write_f32::<NetworkEndian>(*speed)?;
+                }
+            }
+            _ => (),
+        }
+
+        match &self {
+            Self::Pong { encrypted_payload, .. } | Self::Peng { encrypted_payload, .. } => {
+                w.write_u8(Self::PART_PAYLOAD)?;
+                w.write_u16::<NetworkEndian>(encrypted_payload.len() as u16)?;
+                w.write_all(encrypted_payload.message())?;
+            }
+            _ => (),
+        }
+
+        w.write_u8(Self::PART_END)?;
+
+        let pos = w.position() as usize;
+        let signature = key.sign(&w.get_ref()[0..pos]);
+        w.write_u8(signature.as_ref().len() as u8)?;
+        w.write_all(signature.as_ref())?;
+
+        Ok(w.position() as usize)
+    }
+}
+
+#[derive(PartialEq, Debug)]
+pub enum InitResult<P: Payload> {
+    Continue,
+    Success { peer_payload: P, is_initiator: bool },
+}
+
+pub struct InitState<P: Payload> {
+    node_id: NodeId,
+    salted_node_id_hash: SaltedNodeIdHash,
+    payload: P,
+    key_pair: Arc<Ed25519KeyPair>,
+    trusted_keys: Arc<[Ed25519PublicKey]>,
+    ecdh_private_key: Option<EcdhPrivateKey>,
+    next_stage: u8,
+    close_time: usize,
+    last_message: Option<Vec<u8>>,
+    crypto: Option<CryptoCore>,
+    algorithms: Algorithms,
+    #[allow(dead_code)] // Used in tests
+    selected_algorithm: Option<&'static Algorithm>,
+    failed_retries: usize,
+}
+
+impl<P: Payload> InitState<P> {
+    pub fn new(
+        node_id: NodeId, payload: P, key_pair: Arc<Ed25519KeyPair>, trusted_keys: Arc<[Ed25519PublicKey]>,
+        algorithms: Algorithms,
+    ) -> Self {
+        let mut hash = [0; SALTED_NODE_ID_HASH_LEN];
+        let rng = SystemRandom::new();
+        rng.fill(&mut hash[0..4]).unwrap();
+        hash[4..].clone_from_slice(&node_id);
+        let d = digest::digest(&digest::SHA256, &hash);
+        hash[4..].clone_from_slice(&d.as_ref()[..16]);
+        Self {
+            node_id,
+            salted_node_id_hash: hash,
+            payload,
+            key_pair,
+            trusted_keys,
+            next_stage: STAGE_PING,
+            last_message: None,
+            crypto: None,
+            ecdh_private_key: None,
+            selected_algorithm: None,
+            algorithms,
+            failed_retries: 0,
+            close_time: 60,
+        }
+    }
+
+    pub fn send_ping(&mut self, out: &mut MsgBuffer) {
+        // create ecdh ephemeral key
+        let (ecdh_private_key, ecdh_public_key) = self.create_ecdh_keypair();
+        self.ecdh_private_key = Some(ecdh_private_key);
+
+        // create stage 1 msg
+        self.send_message(STAGE_PING, Some(ecdh_public_key), out);
+
+        self.next_stage = STAGE_PONG;
+    }
+
+    pub fn stage(&self) -> u8 {
+        self.next_stage
+    }
+
+    pub fn every_second(&mut self, out: &mut MsgBuffer) -> Result<(), Error> {
+        if self.next_stage == WAITING_TO_CLOSE {
+            if self.close_time == 0 {
+                self.next_stage = CLOSING;
+            } else {
+                self.close_time -= 1;
+            }
+            Ok(())
+        } else if self.next_stage == CLOSING {
+            Ok(())
+        } else if self.failed_retries < MAX_FAILED_RETRIES {
+            self.failed_retries += 1;
+            self.repeat_last_message(out);
+            Ok(())
+        } else {
+            self.next_stage = CLOSING;
+            Err(Error::CryptoInitFatal("Initialization timeout"))
+        }
+    }
+
+    fn derive_master_key(&self, algo: &'static Algorithm, privk: EcdhPrivateKey, pubk: &EcdhPublicKey) -> LessSafeKey {
+        agree_ephemeral(privk, pubk, |k| {
+            UnboundKey::new(algo, &k[..algo.key_len()]).map(LessSafeKey::new).unwrap()
+        })
+        .unwrap()
+    }
+
+    fn create_ecdh_keypair(&self) -> (EcdhPrivateKey, EcdhPublicKey) {
+        let rand = SystemRandom::new();
+        let ecdh_private_key = EcdhPrivateKey::generate(&X25519, &rand).unwrap();
+        let public_key = ecdh_private_key.compute_public_key().unwrap();
+        let mut vec = SmallVec::<[u8; 96]>::new();
+        vec.extend_from_slice(public_key.as_ref());
+        let ecdh_public_key = EcdhPublicKey::new(&X25519, vec);
+        (ecdh_private_key, ecdh_public_key)
+    }
+
+    fn encrypt_payload(&mut self) -> MsgBuffer {
+        let mut buffer = MsgBuffer::new(EXTRA_LEN);
+        self.payload.write_to(&mut buffer);
+        if let Some(crypto) = &mut self.crypto {
+            crypto.encrypt(&mut buffer);
+        }
+        buffer
+    }
+
+    fn decrypt(&mut self, data: &mut MsgBuffer) -> Result<P, Error> {
+        if let Some(crypto) = &mut self.crypto {
+            crypto.decrypt(data)?;
+        }
+        P::read_from(Cursor::new(data.message()))
+    }
+
+    fn check_salted_node_id_hash(&self, hash: &SaltedNodeIdHash, node_id: NodeId) -> bool {
+        let mut h2 = [0; SALTED_NODE_ID_HASH_LEN];
+        h2[0..4].clone_from_slice(&hash[0..4]);
+        h2[4..].clone_from_slice(&node_id);
+        let d = digest::digest(&digest::SHA256, &h2);
+        hash == d.as_ref()
+    }
+
+    fn send_message(&mut self, stage: u8, ecdh_public_key: Option<EcdhPublicKey>, out: &mut MsgBuffer) {
+        debug!("Sending init with stage={}", stage);
+        assert!(out.is_empty());
+        let mut public_key = [0; ED25519_PUBLIC_KEY_LEN];
+        public_key.clone_from_slice(self.key_pair.as_ref().public_key().as_ref());
+        let msg = match stage {
+            STAGE_PING => InitMsg::Ping {
+                salted_node_id_hash: self.salted_node_id_hash,
+                ecdh_public_key: ecdh_public_key.unwrap(),
+                algorithms: self.algorithms.clone(),
+            },
+            STAGE_PONG => InitMsg::Pong {
+                salted_node_id_hash: self.salted_node_id_hash,
+                ecdh_public_key: ecdh_public_key.unwrap(),
+                algorithms: self.algorithms.clone(),
+                encrypted_payload: self.encrypt_payload(),
+            },
+            STAGE_PENG => InitMsg::Peng {
+                salted_node_id_hash: self.salted_node_id_hash,
+                encrypted_payload: self.encrypt_payload(),
+            },
+            _ => unreachable!(),
+        };
+        let bytes = out.buffer();
+        let len = msg.write_to(bytes, &self.key_pair).expect("Buffer too small");
+        self.last_message = Some(bytes[0..len].to_vec());
+        out.set_length(len);
+    }
+
+    fn repeat_last_message(&self, out: &mut MsgBuffer) {
+        if let Some(ref bytes) = self.last_message {
+            debug!("Repeating last init message");
+            let buffer = out.buffer();
+            buffer[0..bytes.len()].copy_from_slice(bytes);
+            out.set_length(bytes.len());
+        }
+    }
+
+    fn select_algorithm(&self, peer_algos: &Algorithms) -> Result<Option<(&'static Algorithm, f32)>, Error> {
+        if self.algorithms.allow_unencrypted && peer_algos.allow_unencrypted {
+            return Ok(None);
+        }
+        // For each supported algorithm, find the algorithm in the list of the peer (ignore algorithm if not found).
+        // Take the minimal speed reported by either us or the peer.
+        // Select the algorithm with the greatest minimal speed.
+        let algo = self
+            .algorithms
+            .algorithm_speeds
+            .iter()
+            .filter_map(|(a1, s1)| {
+                peer_algos
+                    .algorithm_speeds
+                    .iter()
+                    .find(|(a2, _)| a1 == a2)
+                    .map(|(_, s2)| (*a1, if s1 < s2 { *s1 } else { *s2 }))
+            })
+            .max_by(|(_, s1), (_, s2)| if s1 < s2 { cmp::Ordering::Less } else { cmp::Ordering::Greater });
+        if let Some(algo) = algo {
+            debug!("Init: best algorithm is {:?} with speed {}", algo.0, algo.1);
+            Ok(Some(algo))
+        } else {
+            Err(Error::CryptoInitFatal("No common algorithms"))
+        }
+    }
+
+    pub fn handle_init(&mut self, out: &mut MsgBuffer) -> Result<InitResult<P>, Error> {
+        let (msg, _peer_key) = InitMsg::read_from(out.buffer(), &self.trusted_keys)?;
+        out.clear();
+        let stage = msg.stage();
+        let salted_node_id_hash = *msg.salted_node_id_hash();
+        debug!("Received init with stage={}, expected stage={}", stage, self.next_stage);
+        if self.salted_node_id_hash == salted_node_id_hash
+            || self.check_salted_node_id_hash(&salted_node_id_hash, self.node_id)
+        {
+            return Err(Error::CryptoInitFatal("Connected to self"));
+        }
+        if stage != self.next_stage {
+            if self.next_stage == STAGE_PONG && stage == STAGE_PING {
+                // special case for concurrent init messages in both directions
+                // the node with the higher node_id "wins" and gets to initialize the connection
+                if salted_node_id_hash > self.salted_node_id_hash {
+                    // reset to initial state
+                    self.next_stage = STAGE_PING;
+                    self.last_message = None;
+                    self.ecdh_private_key = None;
+                } else {
+                    return Ok(InitResult::Continue);
+                }
+            } else if self.next_stage == CLOSING {
+                return Ok(InitResult::Continue);
+            } else if self.last_message.is_some() {
+                self.repeat_last_message(out);
+                return Ok(InitResult::Continue);
+            } else {
+                return Err(Error::CryptoInitFatal("Received invalid stage as first message"));
+            }
+        }
+        self.failed_retries = 0;
+        match msg {
+            InitMsg::Ping { ecdh_public_key, algorithms, .. } => {
+                // create ecdh ephemeral key
+                let (my_ecdh_private_key, my_ecdh_public_key) = self.create_ecdh_keypair();
+
+                // do ecdh agreement and derive master key
+                let algorithm = self.select_algorithm(&algorithms)?;
+                self.selected_algorithm = algorithm.map(|a| a.0);
+                if let Some((algorithm, _speed)) = algorithm {
+                    let master_key = self.derive_master_key(algorithm, my_ecdh_private_key, &ecdh_public_key);
+                    self.crypto = Some(CryptoCore::new(master_key, self.salted_node_id_hash > salted_node_id_hash));
+                }
+
+                // create and send stage 2 reply
+                self.send_message(STAGE_PONG, Some(my_ecdh_public_key), out);
+
+                self.next_stage = STAGE_PENG;
+                Ok(InitResult::Continue)
+            }
+            InitMsg::Pong { ecdh_public_key, algorithms, mut encrypted_payload, .. } => {
+                // do ecdh agreement and derive master key
+                let ecdh_private_key = self.ecdh_private_key.take().unwrap();
+                let algorithm = self.select_algorithm(&algorithms)?;
+                self.selected_algorithm = algorithm.map(|a| a.0);
+                if let Some((algorithm, _speed)) = algorithm {
+                    let master_key = self.derive_master_key(algorithm, ecdh_private_key, &ecdh_public_key);
+                    self.crypto = Some(CryptoCore::new(master_key, self.salted_node_id_hash > salted_node_id_hash));
+                }
+
+                // decrypt the payload
+                let peer_payload = self
+                    .decrypt(&mut encrypted_payload)
+                    .map_err(|_| Error::CryptoInitFatal("Failed to decrypt payload"))?;
+
+                // create and send stage 3 reply
+                self.send_message(STAGE_PENG, None, out);
+
+                self.next_stage = WAITING_TO_CLOSE;
+                self.close_time = 60;
+                Ok(InitResult::Success { peer_payload, is_initiator: true })
+            }
+            InitMsg::Peng { mut encrypted_payload, .. } => {
+                // decrypt the payload
+                let peer_payload = self
+                    .decrypt(&mut encrypted_payload)
+                    .map_err(|_| Error::CryptoInitFatal("Failed to decrypt payload"))?;
+
+                self.next_stage = CLOSING; // force resend when receiving any message
+                Ok(InitResult::Success { peer_payload, is_initiator: false })
+            }
+        }
+    }
+
+    pub fn take_core(&mut self) -> Option<CryptoCore> {
+        self.crypto.take()
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use crate::types::NODE_ID_BYTES;
+
+    impl Payload for Vec<u8> {
+        fn write_to(&self, buffer: &mut MsgBuffer) {
+            buffer.buffer().write_all(self).expect("Buffer too small");
+            buffer.set_length(self.len())
+        }
+
+        fn read_from<R: Read>(mut r: R) -> Result<Self, Error> {
+            let mut data = Vec::new();
+            r.read_to_end(&mut data).map_err(|_| Error::Parse("Buffer too small"))?;
+            Ok(data)
+        }
+    }
+
+    fn create_pair() -> (InitState<Vec<u8>>, InitState<Vec<u8>>) {
+        let rng = SystemRandom::new();
+        let pkcs8_bytes = Ed25519KeyPair::generate_pkcs8(&rng).unwrap();
+        let key_pair = Arc::new(Ed25519KeyPair::from_pkcs8(pkcs8_bytes.as_ref()).unwrap());
+        let mut public_key = [0; ED25519_PUBLIC_KEY_LEN];
+        public_key.clone_from_slice(key_pair.public_key().as_ref());
+        let trusted_nodes = Arc::new([public_key]);
+        let mut node1 = [0; NODE_ID_BYTES];
+        rng.fill(&mut node1).unwrap();
+        let mut node2 = [0; NODE_ID_BYTES];
+        rng.fill(&mut node2).unwrap();
+        let algorithms = Algorithms {
+            algorithm_speeds: smallvec![(&AES_128_GCM, 600.0), (&AES_256_GCM, 500.0), (&CHACHA20_POLY1305, 400.0)],
+            allow_unencrypted: false,
+        };
+        let sender = InitState::new(node1, vec![1], key_pair.clone(), trusted_nodes.clone(), algorithms.clone());
+        let receiver = InitState::new(node2, vec![2], key_pair, trusted_nodes, algorithms);
+        (sender, receiver)
+    }
+
+    #[test]
+    fn normal_init() {
+        let (mut sender, mut receiver) = create_pair();
+        let mut out = MsgBuffer::new(8);
+        sender.send_ping(&mut out);
+        assert_eq!(sender.stage(), STAGE_PONG);
+        let result = receiver.handle_init(&mut out).unwrap();
+        assert_eq!(receiver.stage(), STAGE_PENG);
+        assert_eq!(result, InitResult::Continue);
+        let result = sender.handle_init(&mut out).unwrap();
+        assert_eq!(sender.stage(), WAITING_TO_CLOSE);
+        let result = match result {
+            InitResult::Success { .. } => receiver.handle_init(&mut out).unwrap(),
+            InitResult::Continue => unreachable!(),
+        };
+        assert_eq!(receiver.stage(), CLOSING);
+        match result {
+            InitResult::Success { .. } => assert!(out.is_empty()),
+            InitResult::Continue => unreachable!(),
+        }
+    }
+
+    #[test]
+    fn lost_init_sender_recovers() {
+        let (mut sender, mut receiver) = create_pair();
+        let mut out = MsgBuffer::new(8);
+        sender.send_ping(&mut out);
+        assert_eq!(sender.stage(), STAGE_PONG);
+        // lost ping, sender recovers
+        out.clear();
+        sender.every_second(&mut out).unwrap();
+        let result = receiver.handle_init(&mut out).unwrap();
+        assert_eq!(receiver.stage(), STAGE_PENG);
+        assert_eq!(result, InitResult::Continue);
+        // lost pong, sender recovers
+        out.clear();
+        receiver.every_second(&mut out).unwrap();
+        let result = sender.handle_init(&mut out).unwrap();
+        assert_eq!(sender.stage(), WAITING_TO_CLOSE);
+        match result {
+            InitResult::Success { .. } => {
+                // lost peng, sender recovers
+                out.clear();
+            }
+            InitResult::Continue => unreachable!(),
+        };
+        sender.every_second(&mut out).unwrap();
+        let result = receiver.handle_init(&mut out).unwrap();
+        assert_eq!(receiver.stage(), CLOSING);
+        match result {
+            InitResult::Success { .. } => assert!(out.is_empty()),
+            InitResult::Continue => unreachable!(),
+        }
+    }
+
+    #[test]
+    fn lost_init_receiver_recovers() {
+        let (mut sender, mut receiver) = create_pair();
+        let mut out = MsgBuffer::new(8);
+        sender.send_ping(&mut out);
+        assert_eq!(sender.stage(), STAGE_PONG);
+        let result = receiver.handle_init(&mut out).unwrap();
+        assert_eq!(receiver.stage(), STAGE_PENG);
+        assert_eq!(result, InitResult::Continue);
+        // lost pong, receiver recovers
+        out.clear();
+        sender.every_second(&mut out).unwrap();
+        receiver.handle_init(&mut out).unwrap();
+        let result = sender.handle_init(&mut out).unwrap();
+        assert_eq!(sender.stage(), WAITING_TO_CLOSE);
+        match result {
+            InitResult::Success { .. } => {
+                // lost peng, sender recovers
+                out.clear();
+            }
+            InitResult::Continue => unreachable!(),
+        };
+        receiver.every_second(&mut out).unwrap();
+        sender.handle_init(&mut out).unwrap();
+        let result = receiver.handle_init(&mut out).unwrap();
+        assert_eq!(receiver.stage(), CLOSING);
+        match result {
+            InitResult::Success { .. } => assert!(out.is_empty()),
+            InitResult::Continue => unreachable!(),
+        }
+    }
+
+    #[test]
+    fn timeout() {
+        let (mut sender, _receiver) = create_pair();
+        let mut out = MsgBuffer::new(8);
+        sender.send_ping(&mut out);
+        assert_eq!(sender.stage(), STAGE_PONG);
+        for _ in 0..120 {
+            out.clear();
+            sender.every_second(&mut out).unwrap();
+        }
+        out.clear();
+        assert!(sender.every_second(&mut out).is_err());
+        assert_eq!(sender.stage(), CLOSING);
+    }
+
+    #[test]
+    fn untrusted_peer() {
+        let (mut sender, _) = create_pair();
+        let (_, mut receiver) = create_pair();
+        let mut out = MsgBuffer::new(8);
+        sender.send_ping(&mut out);
+        assert_eq!(sender.stage(), STAGE_PONG);
+        assert!(receiver.handle_init(&mut out).is_err());
+    }
+
+    #[test]
+    fn manipulated_message() {
+        let (mut sender, mut receiver) = create_pair();
+        let mut out = MsgBuffer::new(8);
+        sender.send_ping(&mut out);
+        assert_eq!(sender.stage(), STAGE_PONG);
+        out.message_mut()[10] ^= 0x01;
+        assert!(receiver.handle_init(&mut out).is_err());
+    }
+
+    #[test]
+    fn connect_to_self() {
+        let (mut sender, _) = create_pair();
+        let mut out = MsgBuffer::new(8);
+        sender.send_ping(&mut out);
+        assert_eq!(sender.stage(), STAGE_PONG);
+        assert!(sender.handle_init(&mut out).is_err());
+    }
+
+    fn test_algorithm_negotiation(
+        algos1: Algorithms, algos2: Algorithms, success: bool, selected: Option<&'static Algorithm>,
+    ) {
+        let (mut sender, mut receiver) = create_pair();
+        sender.algorithms = algos1;
+        receiver.algorithms = algos2;
+        let mut out = MsgBuffer::new(8);
+        sender.send_ping(&mut out);
+        let res = receiver.handle_init(&mut out);
+        assert_eq!(res.is_ok(), success);
+        if !success {
+            return;
+        }
+        sender.handle_init(&mut out).unwrap();
+        receiver.handle_init(&mut out).unwrap();
+        assert_eq!(sender.selected_algorithm, selected);
+        assert_eq!(sender.selected_algorithm, receiver.selected_algorithm);
+    }
+
+    #[test]
+    fn algorithm_negotiation() {
+        // Equal algorithms
+        test_algorithm_negotiation(
+            Algorithms {
+                algorithm_speeds: smallvec![(&AES_128_GCM, 600.0), (&AES_256_GCM, 500.0), (&CHACHA20_POLY1305, 400.0)],
+                allow_unencrypted: false,
+            },
+            Algorithms {
+                algorithm_speeds: smallvec![(&AES_128_GCM, 600.0), (&AES_256_GCM, 500.0), (&CHACHA20_POLY1305, 400.0)],
+                allow_unencrypted: false,
+            },
+            true,
+            Some(&AES_128_GCM),
+        );
+
+        // Overlapping but different
+        test_algorithm_negotiation(
+            Algorithms {
+                algorithm_speeds: smallvec![(&AES_256_GCM, 500.0), (&CHACHA20_POLY1305, 400.0)],
+                allow_unencrypted: false,
+            },
+            Algorithms {
+                algorithm_speeds: smallvec![(&AES_128_GCM, 600.0), (&AES_256_GCM, 500.0)],
+                allow_unencrypted: false,
+            },
+            true,
+            Some(&AES_256_GCM),
+        );
+
+        // Select fastest pair
+        test_algorithm_negotiation(
+            Algorithms {
+                algorithm_speeds: smallvec![(&AES_128_GCM, 600.0), (&AES_256_GCM, 500.0), (&CHACHA20_POLY1305, 400.0)],
+                allow_unencrypted: false,
+            },
+            Algorithms {
+                algorithm_speeds: smallvec![(&AES_128_GCM, 40.0), (&AES_256_GCM, 50.0), (&CHACHA20_POLY1305, 60.0)],
+                allow_unencrypted: false,
+            },
+            true,
+            Some(&CHACHA20_POLY1305),
+        );
+
+        // Select unencrypted if supported by both
+        test_algorithm_negotiation(
+            Algorithms {
+                algorithm_speeds: smallvec![(&AES_128_GCM, 600.0), (&AES_256_GCM, 500.0), (&CHACHA20_POLY1305, 400.0)],
+                allow_unencrypted: true,
+            },
+            Algorithms {
+                algorithm_speeds: smallvec![(&AES_128_GCM, 600.0), (&AES_256_GCM, 500.0), (&CHACHA20_POLY1305, 400.0)],
+                allow_unencrypted: true,
+            },
+            true,
+            None,
+        );
+
+        // Do not select unencrypted if only supported by one
+        test_algorithm_negotiation(
+            Algorithms {
+                algorithm_speeds: smallvec![(&AES_128_GCM, 600.0), (&AES_256_GCM, 500.0), (&CHACHA20_POLY1305, 400.0)],
+                allow_unencrypted: true,
+            },
+            Algorithms {
+                algorithm_speeds: smallvec![(&AES_128_GCM, 600.0), (&AES_256_GCM, 500.0), (&CHACHA20_POLY1305, 400.0)],
+                allow_unencrypted: false,
+            },
+            true,
+            Some(&AES_128_GCM),
+        );
+
+        // Fail if no match
+        test_algorithm_negotiation(
+            Algorithms { algorithm_speeds: smallvec![(&AES_128_GCM, 600.0)], allow_unencrypted: true },
+            Algorithms {
+                algorithm_speeds: smallvec![(&AES_256_GCM, 500.0), (&CHACHA20_POLY1305, 400.0)],
+                allow_unencrypted: false,
+            },
+            false,
+            Some(&AES_128_GCM),
+        );
+    }
+}

src/crypto/mod.rs

@@ -0,0 +1,11 @@
+// VpnCloud - Peer-to-Peer VPN
+// Copyright (C) 2015-2021  Dennis Schwerdel
+// This software is licensed under GPL-3 or newer (see LICENSE.md)
+
+mod common;
+mod core;
+mod init;
+mod rotate;
+
+pub use self::core::{EXTRA_LEN, TAG_LEN};
+pub use common::*;

src/crypto/rotate.rs

@@ -0,0 +1,412 @@
+// VpnCloud - Peer-to-Peer VPN
+// Copyright (C) 2015-2021  Dennis Schwerdel
+// This software is licensed under GPL-3 or newer (see LICENSE.md)
+
+// This module implements a turn based key rotation.
+//
+// The main idea is that both peers periodically create ecdh key pairs and exchange their public keys to create
+// common key material. There are always two separate ecdh handshakes going on: one initiated by each peer.
+// However, one handshake is always one step ahead of the other. That means that every message being sent contains a
+// public key from step 1 of the handshake "proposed key" and a public key from step 2 of the handshake "confirmed
+// key" (all messages except first message).
+//
+// When receiving a message from the peer, the node will create a new ecdh key pair and perform the key
+// calculation for the proposed key. The peer will store the public key for the confirmation as pending to be
+// confirmed in the next cycle. Also, if the message contains a confirmation (all but the very first message do),
+// the node will use the stored private key to perform the ecdh key calculation and emit that key to be used in
+// the crypto stream.
+//
+// Upon each cycle, a node first checks if it still has a proposed key that has not been confirmed by the remote
+// peer. If so, a message must have been lost and the whole last message including the proposed key as well as the
+// last confirmed key is being resent. If no proposed key is stored, the node will create a new ecdh key pair, and
+// store the private key as proposed key. It then sends out a message containing the public key as proposal, as
+// well as confirming the pending key. This key is also emitted to be added to the crypto stream but not to be
+// used for encrypting.
+//
+// Monotonically increasing message ids guard the communication from message duplication and also serve as
+// identifiers for the keys to be used in the crypto stream. Since the keys are rotating, the last 2 bits of the
+// id are enough to identify the key.
+//
+// The whole communication is sent via the crypto stream and is therefore encrypted and protected against tampering.
+
+use super::Key;
+use crate::{error::Error, util::MsgBuffer};
+use byteorder::{NetworkEndian, ReadBytesExt, WriteBytesExt};
+use ring::{
+    agreement::{agree_ephemeral, EphemeralPrivateKey, UnparsedPublicKey, X25519},
+    rand::SystemRandom,
+};
+use smallvec::{smallvec, SmallVec};
+use std::io::{self, Cursor, Read, Write};
+
+type EcdhPublicKey = UnparsedPublicKey<SmallVec<[u8; 96]>>;
+type EcdhPrivateKey = EphemeralPrivateKey;
+
+pub struct RotationMessage {
+    message_id: u64,
+    propose: EcdhPublicKey,
+    confirm: Option<EcdhPublicKey>,
+}
+
+impl RotationMessage {
+    #[allow(dead_code)]
+    pub fn read_from<R: Read>(mut r: R) -> Result<Self, io::Error> {
+        let message_id = r.read_u64::<NetworkEndian>()?;
+        let key_len = r.read_u8()? as usize;
+        let mut key_data = smallvec![0; key_len];
+        r.read_exact(&mut key_data)?;
+        let propose = EcdhPublicKey::new(&X25519, key_data);
+        let key_len = r.read_u8()? as usize;
+        let confirm = if key_len > 0 {
+            let mut key_data = smallvec![0; key_len];
+            r.read_exact(&mut key_data)?;
+            Some(EcdhPublicKey::new(&X25519, key_data))
+        } else {
+            None
+        };
+        Ok(RotationMessage { message_id, propose, confirm })
+    }
+
+    #[allow(dead_code)]
+    pub fn write_to<W: Write>(&self, mut w: W) -> Result<(), io::Error> {
+        w.write_u64::<NetworkEndian>(self.message_id)?;
+        let key_bytes = self.propose.bytes();
+        w.write_u8(key_bytes.len() as u8)?;
+        w.write_all(key_bytes)?;
+        if let Some(ref key) = self.confirm {
+            let key_bytes = key.bytes();
+            w.write_u8(key_bytes.len() as u8)?;
+            w.write_all(key_bytes)?;
+        } else {
+            w.write_u8(0)?;
+        }
+        Ok(())
+    }
+}
+
+pub struct RotationState {
+    confirmed: Option<(EcdhPublicKey, u64)>, // sent by remote, already confirmed
+    pending: Option<(Key, EcdhPublicKey)>,   // sent by remote, to be confirmed
+    proposed: Option<EcdhPrivateKey>,        // my own, proposed but not confirmed
+    message_id: u64,
+    timeout: bool,
+}
+
+pub struct RotatedKey {
+    pub key: Key,
+    pub id: u64,
+    pub use_for_sending: bool,
+}
+
+impl RotationState {
+    #[allow(dead_code)]
+    pub fn new(initiator: bool, out: &mut MsgBuffer) -> Self {
+        if initiator {
+            let (private_key, public_key) = Self::create_key();
+            Self::send(&RotationMessage { message_id: 1, confirm: None, propose: public_key }, out);
+            Self { confirmed: None, pending: None, proposed: Some(private_key), message_id: 1, timeout: false }
+        } else {
+            Self { confirmed: None, pending: None, proposed: None, message_id: 0, timeout: false }
+        }
+    }
+
+    fn send(msg: &RotationMessage, out: &mut MsgBuffer) {
+        assert!(out.is_empty());
+        debug!("Rotation sending message with id {}", msg.message_id);
+        let len;
+        {
+            let mut cursor = Cursor::new(out.buffer());
+            msg.write_to(&mut cursor).expect("Buffer too small");
+            len = cursor.position() as usize;
+        }
+        out.set_length(len);
+    }
+
+    fn create_key() -> (EcdhPrivateKey, EcdhPublicKey) {
+        let rand = SystemRandom::new();
+        let private_key = EcdhPrivateKey::generate(&X25519, &rand).unwrap();
+        let public_key = Self::compute_public_key(&private_key);
+        (private_key, public_key)
+    }
+
+    fn compute_public_key(private_key: &EcdhPrivateKey) -> EcdhPublicKey {
+        let public_key = private_key.compute_public_key().unwrap();
+        let mut vec = SmallVec::<[u8; 96]>::new();
+        vec.extend_from_slice(public_key.as_ref());
+        EcdhPublicKey::new(&X25519, vec)
+    }
+
+    fn derive_key(private_key: EcdhPrivateKey, public_key: EcdhPublicKey) -> Key {
+        agree_ephemeral(private_key, &public_key, |k| {
+            let mut vec = Key::new();
+            vec.extend_from_slice(k);
+            vec
+        })
+        .unwrap()
+    }
+
+    pub fn handle_message(&mut self, msg: &[u8]) -> Result<Option<RotatedKey>, Error> {
+        let msg =
+            RotationMessage::read_from(Cursor::new(msg)).map_err(|_| Error::Crypto("Rotation message too short"))?;
+        Ok(self.process_message(msg))
+    }
+
+    pub fn process_message(&mut self, msg: RotationMessage) -> Option<RotatedKey> {
+        if msg.message_id <= self.message_id {
+            return None;
+        }
+        debug!("Received rotation message with id {}", msg.message_id);
+        self.timeout = false;
+        // Create key from proposal and store reply as pending
+        let (private_key, public_key) = Self::create_key();
+        let key = Self::derive_key(private_key, msg.propose);
+        self.pending = Some((key, public_key));
+        // If proposed key has been confirmed, derive and use key
+        if let Some(peer_key) = msg.confirm {
+            if let Some(private_key) = self.proposed.take() {
+                let key = Self::derive_key(private_key, peer_key);
+                return Some(RotatedKey { key, id: msg.message_id, use_for_sending: true });
+            }
+        }
+        None
+    }
+
+    #[allow(dead_code)]
+    pub fn cycle(&mut self, out: &mut MsgBuffer) -> Option<RotatedKey> {
+        if let Some(ref private_key) = self.proposed {
+            // Still a proposed key that has not been confirmed, proposal must have been lost
+            if self.timeout {
+                let proposed_key = Self::compute_public_key(private_key);
+                if let Some((ref confirmed_key, message_id)) = self.confirmed {
+                    // Reconfirm last confirmed key
+                    Self::send(
+                        &RotationMessage { confirm: Some(confirmed_key.clone()), propose: proposed_key, message_id },
+                        out,
+                    );
+                } else {
+                    // First message has been lost
+                    Self::send(&RotationMessage { confirm: None, propose: proposed_key, message_id: 1 }, out);
+                }
+            } else {
+                self.timeout = true;
+            }
+        } else {
+            // No proposed key, our turn to propose a new one
+            if let Some((key, confirm_key)) = self.pending.take() {
+                // Send out pending confirmation and register key for receiving
+                self.message_id += 2;
+                let message_id = self.message_id;
+                let (private_key, propose_key) = Self::create_key();
+                self.proposed = Some(private_key);
+                self.confirmed = Some((confirm_key.clone(), message_id));
+                Self::send(&RotationMessage { confirm: Some(confirm_key), propose: propose_key, message_id }, out);
+                return Some(RotatedKey { key, id: message_id, use_for_sending: false });
+            } else {
+                // Nothing pending nor proposed, still waiting to receive message 1
+                // Do nothing, peer will retry
+            }
+        }
+        None
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    use std::io::Cursor;
+
+    impl MsgBuffer {
+        fn msg(&mut self) -> Option<RotationMessage> {
+            if self.is_empty() {
+                return None;
+            }
+            let msg = RotationMessage::read_from(Cursor::new(self.message())).unwrap();
+            self.set_length(0);
+            Some(msg)
+        }
+    }
+
+    #[test]
+    fn test_encode_decode_message() {
+        let mut data = Vec::with_capacity(100);
+        let (_, key) = RotationState::create_key();
+        let msg = RotationMessage { message_id: 1, propose: key, confirm: None };
+        msg.write_to(&mut data).unwrap();
+        let msg2 = RotationMessage::read_from(Cursor::new(&data)).unwrap();
+        assert_eq!(msg.message_id, msg2.message_id);
+        assert_eq!(msg.propose.bytes(), msg2.propose.bytes());
+        assert_eq!(msg.confirm.map(|v| v.bytes().to_vec()), msg2.confirm.map(|v| v.bytes().to_vec()));
+        let mut data = Vec::with_capacity(100);
+        let (_, key1) = RotationState::create_key();
+        let (_, key2) = RotationState::create_key();
+        let msg = RotationMessage { message_id: 2, propose: key1, confirm: Some(key2) };
+        msg.write_to(&mut data).unwrap();
+        let msg2 = RotationMessage::read_from(Cursor::new(&data)).unwrap();
+        assert_eq!(msg.message_id, msg2.message_id);
+        assert_eq!(msg.propose.bytes(), msg2.propose.bytes());
+        assert_eq!(msg.confirm.map(|v| v.bytes().to_vec()), msg2.confirm.map(|v| v.bytes().to_vec()));
+    }
+
+    #[test]
+    fn test_normal_rotation() {
+        let mut out1 = MsgBuffer::new(8);
+        let mut out2 = MsgBuffer::new(8);
+
+        // Initialization
+        let mut node1 = RotationState::new(true, &mut out1);
+        let mut node2 = RotationState::new(false, &mut out2);
+        assert!(!out1.is_empty());
+        let msg1 = out1.msg().unwrap();
+        assert_eq!(msg1.message_id, 1);
+        assert!(out2.is_empty());
+        // Message 1
+        let key = node2.process_message(msg1);
+        assert!(key.is_none());
+        // Cycle 1
+        let key1 = node1.cycle(&mut out1);
+        let key2 = node2.cycle(&mut out2);
+        assert!(key1.is_none());
+        assert!(out1.is_empty());
+        assert!(key2.is_some());
+        let key2 = key2.unwrap();
+        assert_eq!(key2.id, 2);
+        assert!(!key2.use_for_sending);
+        assert!(!out2.is_empty());
+        let msg2 = out2.msg().unwrap();
+        assert_eq!(msg2.message_id, 2);
+        assert!(msg2.confirm.is_some());
+        // Message 2
+        let key = node1.process_message(msg2);
+        assert!(key.is_some());
+        let key = key.unwrap();
+        assert_eq!(key.id, 2);
+        assert!(key.use_for_sending);
+        // Cycle 2
+        let key1 = node1.cycle(&mut out1);
+        let key2 = node2.cycle(&mut out2);
+        assert!(key1.is_some());
+        let key1 = key1.unwrap();
+        assert_eq!(key1.id, 3);
+        assert!(!key1.use_for_sending);
+        assert!(!out1.is_empty());
+        let msg1 = out1.msg().unwrap();
+        assert_eq!(msg1.message_id, 3);
+        assert!(msg1.confirm.is_some());
+        assert!(key2.is_none());
+        assert!(out2.is_empty());
+        // Message 3
+        let key = node2.process_message(msg1);
+        assert!(key.is_some());
+        let key = key.unwrap();
+        assert_eq!(key.id, 3);
+        assert!(key.use_for_sending);
+        // Cycle 3
+        let key1 = node1.cycle(&mut out1);
+        let key2 = node2.cycle(&mut out2);
+        assert!(key1.is_none());
+        assert!(out1.is_empty());
+        assert!(key2.is_some());
+        let key2 = key2.unwrap();
+        assert_eq!(key2.id, 4);
+        assert!(!key2.use_for_sending);
+        assert!(!out2.is_empty());
+        let msg2 = out2.msg().unwrap();
+        assert_eq!(msg2.message_id, 4);
+        assert!(msg2.confirm.is_some());
+        // Message 4
+        let key = node1.process_message(msg2);
+        assert!(key.is_some());
+        let key = key.unwrap();
+        assert_eq!(key.id, 4);
+        assert!(key.use_for_sending);
+    }
+
+    #[test]
+    fn test_duplication() {
+        let mut out1 = MsgBuffer::new(8);
+        let mut out2 = MsgBuffer::new(8);
+
+        let mut node1 = RotationState::new(true, &mut out1);
+        let mut node2 = RotationState::new(false, &mut out2);
+        let msg1 = out1.clone().msg().unwrap();
+        let msg1_copy = out1.msg().unwrap();
+        node2.process_message(msg1);
+        assert!(node2.process_message(msg1_copy).is_none());
+        node1.cycle(&mut out1);
+        node2.cycle(&mut out2);
+        let msg2 = out2.clone().msg().unwrap();
+        let msg2_copy = out2.msg().unwrap();
+        // Message 2
+        assert!(node1.process_message(msg2).is_some());
+        assert!(node1.process_message(msg2_copy).is_none());
+        // Cycle 2
+        node1.cycle(&mut out1);
+        node2.cycle(&mut out2);
+        let msg1 = out1.clone().msg().unwrap();
+        let msg1_copy = out1.msg().unwrap();
+        // Message 3
+        assert!(node2.process_message(msg1).is_some());
+        assert!(node2.process_message(msg1_copy).is_none());
+        // Cycle 3
+        node1.cycle(&mut out1);
+        node2.cycle(&mut out2);
+        let msg2 = out2.clone().msg().unwrap();
+        let msg2_copy = out2.msg().unwrap();
+        // Message 4
+        assert!(node1.process_message(msg2).is_some());
+        assert!(node1.process_message(msg2_copy).is_none());
+    }
+
+    #[test]
+    fn test_lost_message() {
+        let mut out1 = MsgBuffer::new(8);
+        let mut out2 = MsgBuffer::new(8);
+
+        let mut node1 = RotationState::new(true, &mut out1);
+        let mut node2 = RotationState::new(false, &mut out2);
+        let _msg1 = out1.msg().unwrap();
+        // drop msg1
+        node1.cycle(&mut out1);
+        node2.cycle(&mut out2);
+        assert!(out2.msg().is_none());
+        // Cycle 2
+        node1.cycle(&mut out1);
+        node2.cycle(&mut out2);
+        let msg1 = out1.msg().unwrap();
+        // Message 3
+        assert!(node2.process_message(msg1).is_none());
+        // Cycle 3
+        node1.cycle(&mut out1);
+        node2.cycle(&mut out2);
+        let msg2 = out2.msg().unwrap();
+        // Message 4
+        assert!(node1.process_message(msg2).is_some());
+    }
+
+    #[test]
+    fn test_reflect_back() {
+        let mut out1 = MsgBuffer::new(8);
+        let mut out2 = MsgBuffer::new(8);
+
+        let mut node1 = RotationState::new(true, &mut out1);
+        let mut node2 = RotationState::new(false, &mut out2);
+        let msg1 = out1.msg().unwrap();
+        assert!(node1.process_message(msg1).is_none());
+        node1.cycle(&mut out1);
+        node2.cycle(&mut out2);
+        assert!(out2.msg().is_none());
+        // Cycle 2
+        node1.cycle(&mut out1);
+        node2.cycle(&mut out2);
+        let msg1 = out1.msg().unwrap();
+        // Message 3
+        assert!(node2.process_message(msg1).is_none());
+        // Cycle 3
+        node1.cycle(&mut out1);
+        node2.cycle(&mut out2);
+        let msg2 = out2.msg().unwrap();
+        // Message 4
+        assert!(node1.process_message(msg2).is_some());
+    }
+}

src/device.rs

@@ -1,21 +1,53 @@
 // VpnCloud - Peer-to-Peer VPN
-// Copyright (C) 2015-2019  Dennis Schwerdel
+// Copyright (C) 2015-2021  Dennis Schwerdel
 // This software is licensed under GPL-3 or newer (see LICENSE.md)
 
 use std::{
+    cmp,
     collections::VecDeque,
-    fmt, fs,
-    io::{self, Error as IoError, ErrorKind, Read, Write},
-    os::unix::io::{AsRawFd, RawFd}
+    convert::TryInto,
+    fmt,
+    fs::{self, File},
+    io::{self, BufRead, BufReader, Cursor, Error as IoError, Read, Write},
+    net::{Ipv4Addr, UdpSocket},
+    os::{unix::io::AsRawFd, fd::RawFd},
+    str,
+    str::FromStr
 };
 
-use super::types::Error;
+use crate::{crypto, error::Error, util::MsgBuffer};
 
-extern "C" {
-    fn setup_tap_device(fd: i32, ifname: *mut u8) -> i32;
-    fn setup_tun_device(fd: i32, ifname: *mut u8) -> i32;
+static TUNSETIFF: libc::c_ulong = 1074025674;
+
+#[repr(C)]
+#[derive(Copy, Clone)]
+struct IfReqDataAddr {
+    af: libc::c_int,
+    addr: Ipv4Addr
 }
 
+#[repr(C)]
+union IfReqData {
+    flags: libc::c_short,
+    value: libc::c_int,
+    addr: IfReqDataAddr,
+    _dummy: [u8; 24],
+}
+
+#[repr(C)]
+struct IfReq {
+    ifr_name: [u8; libc::IF_NAMESIZE],
+    data: IfReqData,
+}
+
+impl IfReq {
+    fn new(name: &str) -> Self {
+        assert!(name.len() < libc::IF_NAMESIZE);
+        let mut ifr_name = [0; libc::IF_NAMESIZE];
+        ifr_name[..name.len()].clone_from_slice(name.as_bytes());
+        Self { ifr_name, data: IfReqData { _dummy: [0; 24] } }
+    }
+}
 
 /// The type of a tun/tap device
 #[derive(Serialize, Deserialize, Debug, Clone, Copy, PartialEq)]
@@ -23,12 +55,9 @@ pub enum Type {
     /// Tun interface: This interface transports IP packets.
     #[serde(rename = "tun")]
     Tun,
-    /// Tap interface: This insterface transports Ethernet frames.
+    /// Tap interface: This interface transports Ethernet frames.
     #[serde(rename = "tap")]
     Tap,
-    /// Dummy interface: This interface does nothing.
-    #[serde(rename = "dummy")]
-    Dummy
 }
 
 impl fmt::Display for Type {
@@ -36,11 +65,21 @@ impl fmt::Display for Type {
         match *self {
             Type::Tun => write!(formatter, "tun"),
             Type::Tap => write!(formatter, "tap"),
-            Type::Dummy => write!(formatter, "dummy")
         }
     }
 }
 
+impl FromStr for Type {
+    type Err = &'static str;
+
+    fn from_str(text: &str) -> Result<Self, Self::Err> {
+        Ok(match &text.to_lowercase() as &str {
+            "tun" => Self::Tun,
+            "tap" => Self::Tap,
+            _ => return Err("Unknown device type"),
+        })
+    }
+}
 
 pub trait Device: AsRawFd {
     /// Returns the type of this device
@@ -60,7 +99,7 @@ pub trait Device: AsRawFd {
     ///
     /// # Errors
     /// This method will return an error if the underlying read call fails.
-    fn read(&mut self, buffer: &mut [u8]) -> Result<(usize, usize), Error>;
+    fn read(&mut self, buffer: &mut MsgBuffer) -> Result<(), Error>;
 
     /// Writes a packet/frame to the device
     ///
@@ -71,18 +110,18 @@ pub trait Device: AsRawFd {
     ///
     /// # Errors
     /// This method will return an error if the underlying read call fails.
-    fn write(&mut self, data: &mut [u8], start: usize) -> Result<(), Error>;
-}
+    fn write(&mut self, buffer: &mut MsgBuffer) -> Result<(), Error>;
 
+    fn get_ip(&self) -> Result<Ipv4Addr, Error>;
+}
 
 /// Represents a tun/tap device
 pub struct TunTapDevice {
-    fd: fs::File,
+    fd: File,
     ifname: String,
-    type_: Type
+    type_: Type,
 }
 
-
 impl TunTapDevice {
     /// Creates a new tun/tap device
     ///
@@ -101,32 +140,26 @@ impl TunTapDevice {
     ///
     /// # Panics
     /// This method panics if the interface name is longer than 31 bytes.
+    #[allow(clippy::useless_conversion)]
     pub fn new(ifname: &str, type_: Type, path: Option<&str>) -> io::Result<Self> {
         let path = path.unwrap_or_else(|| Self::default_path(type_));
-        if type_ == Type::Dummy {
-            return Self::dummy(ifname, path, type_)
-        }
         let fd = fs::OpenOptions::new().read(true).write(true).open(path)?;
-        // Add trailing \0 to interface name
-        let mut ifname_string = String::with_capacity(32);
-        ifname_string.push_str(ifname);
-        ifname_string.push('\0');
-        assert!(ifname_string.len() <= 32);
-        let mut ifname_c = ifname_string.into_bytes();
-        let res = match type_ {
-            Type::Tun => unsafe { setup_tun_device(fd.as_raw_fd(), ifname_c.as_mut_ptr()) },
-            Type::Tap => unsafe { setup_tap_device(fd.as_raw_fd(), ifname_c.as_mut_ptr()) },
-            Type::Dummy => unreachable!()
+        let flags = match type_ {
+            Type::Tun => libc::IFF_TUN | libc::IFF_NO_PI,
+            Type::Tap => libc::IFF_TAP | libc::IFF_NO_PI,
         };
+        let mut ifreq = IfReq::new(ifname);
+        ifreq.data.flags = flags as libc::c_short;
+        let res = unsafe { libc::ioctl(fd.as_raw_fd(), TUNSETIFF.try_into().unwrap(), &mut ifreq) };
         match res {
             0 => {
-                // Remove trailing \0 from name
-                while ifname_c.last() == Some(&0) {
-                    ifname_c.pop();
-                }
-                Ok(Self { fd, ifname: String::from_utf8(ifname_c).unwrap(), type_ })
+                let mut ifname = String::with_capacity(32);
+                let mut cursor = Cursor::new(ifreq.ifr_name);
+                cursor.read_to_string(&mut ifname)?;
+                ifname = ifname.trim_end_matches('\0').to_owned();
+                Ok(Self { fd, ifname, type_ })
             }
-            _ => Err(IoError::last_os_error())
+            _ => Err(IoError::last_os_error()),
         }
     }
 
@@ -135,37 +168,12 @@ impl TunTapDevice {
     pub fn default_path(type_: Type) -> &'static str {
         match type_ {
             Type::Tun | Type::Tap => "/dev/net/tun",
-            Type::Dummy => "/dev/null"
         }
     }
 
-    /// Creates a dummy device based on an existing file
-    ///
-    /// This method opens a regular or special file and reads from it to receive packets and
-    /// writes to it to send packets. This method does not use a networking device and therefore
-    /// can be used for testing.
-    ///
-    /// The parameter `path` is the file that should be used. Special files like `/dev/null`,
-    /// named pipes and unix sockets can be used with this method.
-    ///
-    /// Both `ifname` and `type_` parameters have no effect.
-    ///
-    /// # Errors
-    /// This method will return an error if the file can not be opened for reading and writing.
-    #[allow(dead_code)]
-    pub fn dummy(ifname: &str, path: &str, type_: Type) -> io::Result<Self> {
-        Ok(TunTapDevice {
-            fd: fs::OpenOptions::new().create(true).read(true).write(true).open(path)?,
-            ifname: ifname.to_string(),
-            type_
-        })
-    }
-
     #[cfg(any(target_os = "linux", target_os = "android"))]
     #[inline]
-    fn correct_data_after_read(&mut self, _buffer: &mut [u8], start: usize, read: usize) -> (usize, usize) {
-        (start, read)
-    }
+    fn correct_data_after_read(&mut self, _buffer: &mut MsgBuffer) {}
 
     #[cfg(any(
         target_os = "bitrig",
@@ -177,21 +185,17 @@ impl TunTapDevice {
         target_os = "openbsd"
     ))]
     #[inline]
-    fn correct_data_after_read(&mut self, buffer: &mut [u8], start: usize, read: usize) -> (usize, usize) {
+    fn correct_data_after_read(&mut self, buffer: &mut MsgBuffer) {
         if self.type_ == Type::Tun {
             // BSD-based systems add a 4-byte header containing the Ethertype for TUN
-            assert!(read >= 4);
-            (start + 4, read - 4)
+            buffer.set_start(buffer.get_start() + 4);
         } else {
-            (start, read)
         }
     }
 
     #[cfg(any(target_os = "linux", target_os = "android"))]
     #[inline]
-    fn correct_data_before_write(&mut self, _buffer: &mut [u8], start: usize) -> usize {
-        start
-    }
+    fn correct_data_before_write(&mut self, _buffer: &mut MsgBuffer) {}
 
     #[cfg(any(
         target_os = "bitrig",
@@ -203,21 +207,63 @@ impl TunTapDevice {
         target_os = "openbsd"
     ))]
     #[inline]
-    fn correct_data_before_write(&mut self, buffer: &mut [u8], start: usize) -> usize {
+    fn correct_data_before_write(&mut self, buffer: &mut MsgBuffer) {
         if self.type_ == Type::Tun {
             // BSD-based systems add a 4-byte header containing the Ethertype for TUN
-            assert!(start >= 4);
-            match buffer[start] >> 4 {
+            buffer.set_start(buffer.get_start() - 4);
+            match buffer.message()[4] >> 4 {
                 // IP version
-                4 => buffer[start - 4..start].copy_from_slice(&[0x00, 0x00, 0x08, 0x00]),
-                6 => buffer[start - 4..start].copy_from_slice(&[0x00, 0x00, 0x86, 0xdd]),
-                _ => unreachable!()
+                4 => buffer.message_mut()[0..4].copy_from_slice(&[0x00, 0x00, 0x08, 0x00]),
+                6 => buffer.message_mut()[0..4].copy_from_slice(&[0x00, 0x00, 0x86, 0xdd]),
+                _ => unreachable!(),
             }
-            start - 4
-        } else {
-            start
         }
     }
+
+    pub fn get_overhead(&self) -> usize {
+        40 /* for outer IPv6 header, can't be sure to only have IPv4 peers */
+        + 8 /* for outer UDP header */
+        + crypto::EXTRA_LEN + crypto::TAG_LEN /* crypto overhead */
+        + 1 /* message type header */
+        + match self.type_ {
+            Type::Tap => 14, /* inner ethernet header */
+            Type::Tun => 0
+        }
+    }
+
+    pub fn set_mtu(&self, value: Option<usize>) -> io::Result<()> {
+        let value = match value {
+            Some(value) => value,
+            None => {
+                let default_device = get_default_device()?;
+                get_device_mtu(&default_device)? - self.get_overhead()
+            }
+        };
+        info!("Setting MTU {} on device {}", value, self.ifname);
+        set_device_mtu(&self.ifname, value)
+    }
+
+    pub fn configure(&self, addr: Ipv4Addr, netmask: Ipv4Addr) -> io::Result<()> {
+        set_device_addr(&self.ifname, addr)?;
+        set_device_netmask(&self.ifname, netmask)?;
+        set_device_enabled(&self.ifname, true)
+    }
+
+    pub fn get_rp_filter(&self) -> io::Result<u8> {
+        Ok(cmp::max(get_rp_filter("all")?, get_rp_filter(&self.ifname)?))
+    }
+
+    pub fn fix_rp_filter(&self) -> io::Result<()> {
+        if get_rp_filter("all")? > 1 {
+            info!("Setting net.ipv4.conf.all.rp_filter=1");
+            set_rp_filter("all", 1)?
+        }
+        if get_rp_filter(&self.ifname)? != 1 {
+            info!("Setting net.ipv4.conf.{}.rp_filter=1", self.ifname);
+            set_rp_filter(&self.ifname, 1)?
+        }
+        Ok(())
+    }
 }
 
 impl Device for TunTapDevice {
@@ -229,19 +275,25 @@ impl Device for TunTapDevice {
         &self.ifname
     }
 
-    fn read(&mut self, mut buffer: &mut [u8]) -> Result<(usize, usize), Error> {
-        let read = self.fd.read(&mut buffer).map_err(|e| Error::TunTapDev("Read error", e))?;
-        let (start, read) = self.correct_data_after_read(&mut buffer, 0, read);
-        Ok((start, read))
+    fn read(&mut self, buffer: &mut MsgBuffer) -> Result<(), Error> {
+        buffer.clear();
+        let read = self.fd.read(buffer.buffer()).map_err(|e| Error::DeviceIo("Read error", e))?;
+        buffer.set_length(read);
+        self.correct_data_after_read(buffer);
+        Ok(())
     }
 
-    fn write(&mut self, mut data: &mut [u8], start: usize) -> Result<(), Error> {
-        let start = self.correct_data_before_write(&mut data, start);
-        match self.fd.write_all(&data[start..]) {
-            Ok(_) => self.fd.flush().map_err(|e| Error::TunTapDev("Flush error", e)),
-            Err(e) => Err(Error::TunTapDev("Write error", e))
+    fn write(&mut self, buffer: &mut MsgBuffer) -> Result<(), Error> {
+        self.correct_data_before_write(buffer);
+        match self.fd.write_all(buffer.message()) {
+            Ok(_) => self.fd.flush().map_err(|e| Error::DeviceIo("Flush error", e)),
+            Err(e) => Err(Error::DeviceIo("Write error", e)),
         }
     }
+
+    fn get_ip(&self) -> Result<Ipv4Addr, Error> {
+        get_device_addr(&self.ifname).map_err(|e| Error::DeviceIo("Error getting IP address", e))
+    }
 }
 
 impl AsRawFd for TunTapDevice {
@@ -251,10 +303,9 @@ impl AsRawFd for TunTapDevice {
     }
 }
 
-
 pub struct MockDevice {
     inbound: VecDeque<Vec<u8>>,
-    outbound: VecDeque<Vec<u8>>
+    outbound: VecDeque<Vec<u8>>,
 }
 
 impl MockDevice {
@@ -277,31 +328,37 @@ impl MockDevice {
 
 impl Device for MockDevice {
     fn get_type(&self) -> Type {
-        Type::Dummy
+        Type::Tun
     }
 
     fn ifname(&self) -> &str {
-        unimplemented!()
+        "mock0"
     }
 
-    fn read(&mut self, buffer: &mut [u8]) -> Result<(usize, usize), Error> {
+    fn read(&mut self, buffer: &mut MsgBuffer) -> Result<(), Error> {
         if let Some(data) = self.inbound.pop_front() {
-            buffer[0..data.len()].copy_from_slice(&data);
-            Ok((0, data.len()))
+            buffer.clear();
+            buffer.set_length(data.len());
+            buffer.message_mut().copy_from_slice(&data);
+            Ok(())
         } else {
-            Err(Error::TunTapDev("empty", io::Error::from(ErrorKind::UnexpectedEof)))
+            Err(Error::Device("empty"))
         }
     }
 
-    fn write(&mut self, data: &mut [u8], start: usize) -> Result<(), Error> {
-        self.outbound.push_back(data[start..].to_owned());
+    fn write(&mut self, buffer: &mut MsgBuffer) -> Result<(), Error> {
+        self.outbound.push_back(buffer.message().into());
         Ok(())
     }
+
+    fn get_ip(&self) -> Result<Ipv4Addr, Error> {
+        Err(Error::Device("Dummy devices have no IP address"))
+    }
 }
 
 impl Default for MockDevice {
     fn default() -> Self {
-        Self { outbound: VecDeque::new(), inbound: VecDeque::new() }
+        Self { outbound: VecDeque::with_capacity(10), inbound: VecDeque::with_capacity(10) }
     }
 }
 
@@ -311,3 +368,141 @@ impl AsRawFd for MockDevice {
         unimplemented!()
     }
 }
+
+#[allow(clippy::useless_conversion)]
+fn set_device_mtu(ifname: &str, mtu: usize) -> io::Result<()> {
+    let sock = UdpSocket::bind("0.0.0.0:0")?;
+    let mut ifreq = IfReq::new(ifname);
+    ifreq.data.value = mtu as libc::c_int;
+    let res = unsafe { libc::ioctl(sock.as_raw_fd(), libc::SIOCSIFMTU.try_into().unwrap(), &mut ifreq) };
+    match res {
+        0 => Ok(()),
+        _ => Err(IoError::last_os_error()),
+    }
+}
+
+#[allow(clippy::useless_conversion)]
+fn get_device_mtu(ifname: &str) -> io::Result<usize> {
+    let sock = UdpSocket::bind("0.0.0.0:0")?;
+    let mut ifreq = IfReq::new(ifname);
+    let res = unsafe { libc::ioctl(sock.as_raw_fd(), libc::SIOCGIFMTU.try_into().unwrap(), &mut ifreq) };
+    match res {
+        0 => Ok(unsafe { ifreq.data.value as usize }),
+        _ => Err(IoError::last_os_error()),
+    }
+}
+
+#[allow(clippy::useless_conversion)]
+fn get_device_addr(ifname: &str) -> io::Result<Ipv4Addr> {
+    let sock = UdpSocket::bind("0.0.0.0:0")?;
+    let mut ifreq = IfReq::new(ifname);
+    let res = unsafe { libc::ioctl(sock.as_raw_fd(), libc::SIOCGIFADDR.try_into().unwrap(), &mut ifreq) };
+    match res {
+        0 => {
+            let af = unsafe { ifreq.data.addr.af };
+            if af as libc::c_int != libc::AF_INET {
+                return Err(io::Error::new(io::ErrorKind::AddrNotAvailable, "Invalid address family".to_owned()));
+            }
+            let ip = unsafe { ifreq.data.addr.addr };
+            Ok(ip)
+        }
+        _ => Err(IoError::last_os_error()),
+    }
+}
+
+#[allow(clippy::useless_conversion)]
+fn set_device_addr(ifname: &str, addr: Ipv4Addr) -> io::Result<()> {
+    let sock = UdpSocket::bind("0.0.0.0:0")?;
+    let mut ifreq = IfReq::new(ifname);
+    ifreq.data.addr.af = libc::AF_INET as libc::c_int;
+    ifreq.data.addr.addr = addr;
+    let res = unsafe { libc::ioctl(sock.as_raw_fd(), libc::SIOCSIFADDR.try_into().unwrap(), &mut ifreq) };
+    match res {
+        0 => Ok(()),
+        _ => Err(IoError::last_os_error()),
+    }
+}
+
+#[allow(dead_code)]
+#[allow(clippy::useless_conversion)]
+fn get_device_netmask(ifname: &str) -> io::Result<Ipv4Addr> {
+    let sock = UdpSocket::bind("0.0.0.0:0")?;
+    let mut ifreq = IfReq::new(ifname);
+    let res = unsafe { libc::ioctl(sock.as_raw_fd(), libc::SIOCGIFNETMASK.try_into().unwrap(), &mut ifreq) };
+    match res {
+        0 => {
+            let af = unsafe { ifreq.data.addr.af };
+            if af as libc::c_int != libc::AF_INET {
+                return Err(io::Error::new(io::ErrorKind::AddrNotAvailable, "Invalid address family".to_owned()));
+            }
+            let ip = unsafe { ifreq.data.addr.addr };
+            Ok(ip)
+        }
+        _ => Err(IoError::last_os_error()),
+    }
+}
+
+#[allow(clippy::useless_conversion)]
+fn set_device_netmask(ifname: &str, addr: Ipv4Addr) -> io::Result<()> {
+    let sock = UdpSocket::bind("0.0.0.0:0")?;
+    let mut ifreq = IfReq::new(ifname);
+    ifreq.data.addr.af = libc::AF_INET as libc::c_int;
+    ifreq.data.addr.addr = addr;
+    let res = unsafe { libc::ioctl(sock.as_raw_fd(), libc::SIOCSIFNETMASK.try_into().unwrap(), &mut ifreq) };
+    match res {
+        0 => Ok(()),
+        _ => Err(IoError::last_os_error()),
+    }
+}
+
+#[allow(clippy::useless_conversion)]
+fn set_device_enabled(ifname: &str, up: bool) -> io::Result<()> {
+    let sock = UdpSocket::bind("0.0.0.0:0")?;
+    let mut ifreq = IfReq::new(ifname);
+    if unsafe { libc::ioctl(sock.as_raw_fd(), libc::SIOCGIFFLAGS.try_into().unwrap(), &mut ifreq) } != 0 {
+        return Err(IoError::last_os_error());
+    }
+    if up {
+        unsafe { ifreq.data.value |= libc::IFF_UP | libc::IFF_RUNNING }
+    } else {
+        unsafe { ifreq.data.value &= !libc::IFF_UP }
+    }
+    let res = unsafe { libc::ioctl(sock.as_raw_fd(), libc::SIOCSIFFLAGS.try_into().unwrap(), &mut ifreq) };
+    match res {
+        0 => Ok(()),
+        _ => Err(IoError::last_os_error()),
+    }
+}
+
+fn get_default_device() -> io::Result<String> {
+    let fd = BufReader::new(File::open("/proc/net/route")?);
+    let mut best = None;
+    for line in fd.lines() {
+        let line = line?;
+        let parts = line.split('\t').collect::<Vec<_>>();
+        if parts[1] == "00000000" {
+            best = Some(parts[0].to_string());
+            break;
+        }
+        if parts[2] != "00000000" {
+            best = Some(parts[0].to_string())
+        }
+    }
+    if let Some(ifname) = best {
+        Ok(ifname)
+    } else {
+        Err(io::Error::new(io::ErrorKind::NotFound, "No default interface found".to_string()))
+    }
+}
+
+fn get_rp_filter(device: &str) -> io::Result<u8> {
+    let mut fd = File::open(format!("/proc/sys/net/ipv4/conf/{}/rp_filter", device))?;
+    let mut contents = String::with_capacity(10);
+    fd.read_to_string(&mut contents)?;
+    u8::from_str(contents.trim()).map_err(|_| io::Error::new(io::ErrorKind::InvalidData, "Invalid rp_filter value"))
+}
+
+fn set_rp_filter(device: &str, val: u8) -> io::Result<()> {
+    let mut fd = File::create(format!("/proc/sys/net/ipv4/conf/{}/rp_filter", device))?;
+    writeln!(fd, "{}", val)
+}

src/error.rs

@@ -0,0 +1,55 @@
+// VpnCloud - Peer-to-Peer VPN
+// Copyright (C) 2015-2021  Dennis Schwerdel
+// This software is licensed under GPL-3 or newer (see LICENSE.md)
+
+use thiserror::Error;
+
+use std::io;
+
+#[derive(Error, Debug)]
+pub enum Error {
+    /// Crypto init error, this is recoverable
+    #[error("Crypto initialization error: {0}")]
+    CryptoInit(&'static str),
+
+    /// Crypto init error, this is fatal and the init needs to be aborted
+    #[error("Fatal crypto initialization error: {0}")]
+    CryptoInitFatal(&'static str),
+
+    /// Crypto error with this one message, no permanent error
+    #[error("Crypto error: {0}")]
+    Crypto(&'static str),
+
+    #[error("Invalid crypto state: {0}")]
+    InvalidCryptoState(&'static str),
+
+    #[error("Invalid config: {0}")]
+    InvalidConfig(&'static str),
+
+    #[error("Socker error: {0}")]
+    Socket(&'static str),
+
+    #[error("Socker error: {0} ({1})")]
+    SocketIo(&'static str, #[source] io::Error),
+
+    #[error("Device error: {0}")]
+    Device(&'static str),
+
+    #[error("Device error: {0} ({1})")]
+    DeviceIo(&'static str, #[source] io::Error),
+
+    #[error("File error: {0}")]
+    FileIo(&'static str, #[source] io::Error),
+
+    #[error("Message error: {0}")]
+    Message(&'static str),
+
+    #[error("Beacon error: {0} ({1})")]
+    BeaconIo(&'static str, #[source] io::Error),
+
+    #[error("Parse error: {0}")]
+    Parse(&'static str),
+
+    #[error("Name can not be resolved: {0}")]
+    NameUnresolvable(String),
+}

src/ethernet.rs

@@ -1,217 +0,0 @@
-// VpnCloud - Peer-to-Peer VPN
-// Copyright (C) 2015-2019  Dennis Schwerdel
-// This software is licensed under GPL-3 or newer (see LICENSE.md)
-
-use std::{
-    collections::{hash_map::Entry, HashMap},
-    hash::BuildHasherDefault,
-    io::{self, Write},
-    marker::PhantomData,
-    net::SocketAddr
-};
-
-use fnv::FnvHasher;
-
-use super::{
-    types::{Address, Error, Protocol, Table},
-    util::{Duration, Time, TimeSource}
-};
-
-/// An ethernet frame dissector
-///
-/// This dissector is able to extract the source and destination addresses of ethernet frames.
-///
-/// If the ethernet frame contains a VLAN tag, both addresses will be prefixed with that tag,
-/// resulting in 8-byte addresses. Additional nested tags will be ignored.
-pub struct Frame;
-
-impl Protocol for Frame {
-    /// Parses an ethernet frame and extracts the source and destination addresses
-    ///
-    /// # Errors
-    /// This method will fail when the given data is not a valid ethernet frame.
-    fn parse(data: &[u8]) -> Result<(Address, Address), Error> {
-        if data.len() < 14 {
-            return Err(Error::Parse("Frame is too short"))
-        }
-        let mut pos = 0;
-        let dst_data = &data[pos..pos + 6];
-        pos += 6;
-        let src_data = &data[pos..pos + 6];
-        pos += 6;
-        if data[pos] == 0x81 && data[pos + 1] == 0x00 {
-            pos += 2;
-            if data.len() < pos + 2 {
-                return Err(Error::Parse("Vlan frame is too short"))
-            }
-            let mut src = [0; 16];
-            let mut dst = [0; 16];
-            src[0] = data[pos];
-            src[1] = data[pos + 1];
-            dst[0] = data[pos];
-            dst[1] = data[pos + 1];
-            src[2..8].copy_from_slice(src_data);
-            dst[2..8].copy_from_slice(dst_data);
-            Ok((Address { data: src, len: 8 }, Address { data: dst, len: 8 }))
-        } else {
-            let src = Address::read_from_fixed(src_data, 6)?;
-            let dst = Address::read_from_fixed(dst_data, 6)?;
-            Ok((src, dst))
-        }
-    }
-}
-
-
-struct SwitchTableValue {
-    address: SocketAddr,
-    timeout: Time
-}
-
-type Hash = BuildHasherDefault<FnvHasher>;
-
-
-/// A table used to implement a learning switch
-///
-/// This table is a simple hash map between an address and the destination peer. It learns
-/// addresses as they are seen and forgets them after some time.
-pub struct SwitchTable<TS> {
-    /// The table storing the actual mapping
-    table: HashMap<Address, SwitchTableValue, Hash>,
-    /// Timeout period for forgetting learnt addresses
-    timeout: Duration,
-    // Timeout period for not overwriting learnt addresses
-    protection_period: Duration,
-    _dummy_ts: PhantomData<TS>
-}
-
-impl<TS: TimeSource> SwitchTable<TS> {
-    /// Creates a new switch table
-    pub fn new(timeout: Duration, protection_period: Duration) -> Self {
-        Self { table: HashMap::default(), timeout, protection_period, _dummy_ts: PhantomData }
-    }
-}
-
-impl<TS: TimeSource> Table for SwitchTable<TS> {
-    /// Forget addresses that have not been seen for the configured timeout
-    fn housekeep(&mut self) {
-        let now = TS::now();
-        let mut del: Vec<Address> = Vec::new();
-        for (key, val) in &self.table {
-            if val.timeout < now {
-                del.push(*key);
-            }
-        }
-        for key in del {
-            info!("Forgot address {}", key);
-            self.table.remove(&key);
-        }
-    }
-
-    /// Write out the table
-    fn write_out<W: Write>(&self, out: &mut W) -> Result<(), io::Error> {
-        let now = TS::now();
-        writeln!(out, "Switch table:")?;
-        for (addr, val) in &self.table {
-            writeln!(out, " - {} => {} (ttl: {} s)", addr, val.address, val.timeout - now)?;
-        }
-        Ok(())
-    }
-
-    /// Learns the given address, inserting it in the hash map
-    #[inline]
-    fn learn(&mut self, key: Address, _prefix_len: Option<u8>, addr: SocketAddr) {
-        let deadline = TS::now() + Time::from(self.timeout);
-        match self.table.entry(key) {
-            Entry::Vacant(entry) => {
-                entry.insert(SwitchTableValue { address: addr, timeout: deadline });
-                info!("Learned address {} => {}", key, addr);
-            }
-            Entry::Occupied(mut entry) => {
-                let mut entry = entry.get_mut();
-                if entry.timeout + Time::from(self.protection_period) > deadline {
-                    // Do not override recently learnt entries
-                    return
-                }
-                entry.timeout = deadline;
-                entry.address = addr;
-            }
-        }
-    }
-
-    /// Retrieves a peer for an address if it is inside the hash map
-    #[inline]
-    fn lookup(&mut self, key: &Address) -> Option<SocketAddr> {
-        match self.table.get(key) {
-            Some(value) => Some(value.address),
-            None => None
-        }
-    }
-
-    /// Removes an address from the map and returns whether something has been removed
-    #[inline]
-    fn remove(&mut self, key: &Address) -> bool {
-        self.table.remove(key).is_some()
-    }
-
-    /// Removed all addresses associated with a certain peer
-    fn remove_all(&mut self, addr: &SocketAddr) {
-        let mut remove = Vec::new();
-        for (key, val) in &self.table {
-            if &val.address == addr {
-                remove.push(*key);
-            }
-        }
-        for key in remove {
-            self.table.remove(&key);
-        }
-    }
-}
-
-
-#[cfg(test)] use super::util::MockTimeSource;
-#[cfg(test)] use std::net::ToSocketAddrs;
-#[cfg(test)] use std::str::FromStr;
-
-#[test]
-fn decode_frame_without_vlan() {
-    let data = [6, 5, 4, 3, 2, 1, 1, 2, 3, 4, 5, 6, 1, 2, 3, 4, 5, 6, 7, 8];
-    let (src, dst) = Frame::parse(&data).unwrap();
-    assert_eq!(src, Address { data: [1, 2, 3, 4, 5, 6, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0], len: 6 });
-    assert_eq!(dst, Address { data: [6, 5, 4, 3, 2, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0], len: 6 });
-}
-
-#[test]
-fn decode_frame_with_vlan() {
-    let data = [6, 5, 4, 3, 2, 1, 1, 2, 3, 4, 5, 6, 0x81, 0, 4, 210, 1, 2, 3, 4, 5, 6, 7, 8];
-    let (src, dst) = Frame::parse(&data).unwrap();
-    assert_eq!(src, Address { data: [4, 210, 1, 2, 3, 4, 5, 6, 0, 0, 0, 0, 0, 0, 0, 0], len: 8 });
-    assert_eq!(dst, Address { data: [4, 210, 6, 5, 4, 3, 2, 1, 0, 0, 0, 0, 0, 0, 0, 0], len: 8 });
-}
-
-#[test]
-fn decode_invalid_frame() {
-    assert!(Frame::parse(&[6, 5, 4, 3, 2, 1, 1, 2, 3, 4, 5, 6, 1, 2, 3, 4, 5, 6, 7, 8]).is_ok());
-    // truncated frame
-    assert!(Frame::parse(&[]).is_err());
-    // truncated vlan frame
-    assert!(Frame::parse(&[6, 5, 4, 3, 2, 1, 1, 2, 3, 4, 5, 6, 0x81, 0x00]).is_err());
-}
-
-#[test]
-fn switch() {
-    MockTimeSource::set_time(1000);
-    let mut table = SwitchTable::<MockTimeSource>::new(10, 1);
-    let addr = Address::from_str("12:34:56:78:90:ab").unwrap();
-    let peer = "1.2.3.4:5678".to_socket_addrs().unwrap().next().unwrap();
-    let peer2 = "1.2.3.5:7890".to_socket_addrs().unwrap().next().unwrap();
-    assert!(table.lookup(&addr).is_none());
-    MockTimeSource::set_time(1000);
-    table.learn(addr.clone(), None, peer.clone());
-    assert_eq!(table.lookup(&addr), Some(peer));
-    MockTimeSource::set_time(1000);
-    table.learn(addr.clone(), None, peer2.clone());
-    assert_eq!(table.lookup(&addr), Some(peer));
-    MockTimeSource::set_time(1010);
-    table.learn(addr.clone(), None, peer2.clone());
-    assert_eq!(table.lookup(&addr), Some(peer2));
-}

src/installer.rs

@@ -0,0 +1,64 @@
+use crate::{error::Error, util::run_cmd};
+use std::{
+    env,
+    fs::{self, File},
+    io::Write,
+    os::unix::fs::PermissionsExt,
+    process::Command,
+};
+
+const MANPAGE: &[u8] = include_bytes!("../target/vpncloud.1.gz");
+const SERVICE_FILE: &[u8] = include_bytes!("../assets/vpncloud@.service");
+const TARGET_FILE: &[u8] = include_bytes!("../assets/vpncloud.target");
+const WS_PROXY_SERVICE_FILE: &[u8] = include_bytes!("../assets/vpncloud-wsproxy.service");
+const EXAMPLE_CONFIG: &[u8] = include_bytes!("../assets/example.net.disabled");
+
+fn systemctl_daemon_reload() {
+    let mut cmd = Command::new("systemctl");
+    cmd.arg("daemon-reload");
+    run_cmd(cmd);
+}
+
+pub fn install() -> Result<(), Error> {
+    env::current_exe()
+        .and_then(|p| fs::copy(p, "/usr/bin/vpncloud"))
+        .map_err(|e| Error::FileIo("Failed to copy binary", e))?;
+    fs::set_permissions("/usr/bin/vpncloud", fs::Permissions::from_mode(0o755))
+        .map_err(|e| Error::FileIo("Failed to set permissions for binary", e))?;
+    fs::create_dir_all("/etc/vpncloud").map_err(|e| Error::FileIo("Failed to create config folder", e))?;
+    fs::set_permissions("/etc/vpncloud", fs::Permissions::from_mode(0o700))
+        .map_err(|e| Error::FileIo("Failed to set permissions for config folder", e))?;
+    File::create("/etc/vpncloud/example.net.disabled")
+        .and_then(|mut f| f.write_all(EXAMPLE_CONFIG))
+        .map_err(|e| Error::FileIo("Failed to create example config", e))?;
+    File::create("/usr/share/man/man1/vpncloud.1.gz")
+        .and_then(|mut f| f.write_all(MANPAGE))
+        .map_err(|e| Error::FileIo("Failed to create manpage", e))?;
+    File::create("/lib/systemd/system/vpncloud@.service")
+        .and_then(|mut f| f.write_all(SERVICE_FILE))
+        .map_err(|e| Error::FileIo("Failed to create service file", e))?;
+    File::create("/lib/systemd/system/vpncloud.target")
+        .and_then(|mut f| f.write_all(TARGET_FILE))
+        .map_err(|e| Error::FileIo("Failed to create service target file", e))?;
+    File::create("/lib/systemd/system/vpncloud-wsproxy.service")
+        .and_then(|mut f| f.write_all(WS_PROXY_SERVICE_FILE))
+        .map_err(|e| Error::FileIo("Failed to create wsporxy service file", e))?;
+    systemctl_daemon_reload();
+    info!("Install successful");
+    Ok(())
+}
+
+pub fn uninstall() -> Result<(), Error> {
+    fs::remove_file("/etc/vpncloud/example.net.disabled").map_err(|e| Error::FileIo("Failed to remove binary", e))?;
+    fs::remove_file("/usr/share/man/man1/vpncloud.1.gz").map_err(|e| Error::FileIo("Failed to remove manpage", e))?;
+    fs::remove_file("/lib/systemd/system/vpncloud@.service")
+        .map_err(|e| Error::FileIo("Failed to remove service file", e))?;
+    fs::remove_file("/lib/systemd/system/vpncloud.target")
+        .map_err(|e| Error::FileIo("Failed to remove service target file", e))?;
+    fs::remove_file("/lib/systemd/system/vpncloud-wsproxy.service")
+        .map_err(|e| Error::FileIo("Failed to remove wsproxy service file", e))?;
+    fs::remove_file("/usr/bin/vpncloud").map_err(|e| Error::FileIo("Failed to remove binary", e))?;
+    systemctl_daemon_reload();
+    info!("Uninstall successful");
+    Ok(())
+}

src/ip.rs

@@ -1,295 +0,0 @@
-// VpnCloud - Peer-to-Peer VPN
-// Copyright (C) 2015-2019  Dennis Schwerdel
-// This software is licensed under GPL-3 or newer (see LICENSE.md)
-
-use std::{
-    collections::{hash_map, HashMap},
-    hash::BuildHasherDefault,
-    io::{self, Write},
-    net::SocketAddr
-};
-
-use fnv::FnvHasher;
-
-use super::types::{Address, Error, Protocol, Table};
-
-
-/// An IP packet dissector
-///
-/// This dissector is able to extract the source and destination ip addresses of ipv4 packets and
-/// ipv6 packets.
-#[allow(dead_code)]
-pub struct Packet;
-
-impl Protocol for Packet {
-    /// Parses an ip packet and extracts the source and destination addresses
-    ///
-    /// # Errors
-    /// This method will fail when the given data is not a valid ipv4 and ipv6 packet.
-    fn parse(data: &[u8]) -> Result<(Address, Address), Error> {
-        if data.is_empty() {
-            return Err(Error::Parse("Empty header"))
-        }
-        let version = data[0] >> 4;
-        match version {
-            4 => {
-                if data.len() < 20 {
-                    return Err(Error::Parse("Truncated IPv4 header"))
-                }
-                let src = Address::read_from_fixed(&data[12..], 4)?;
-                let dst = Address::read_from_fixed(&data[16..], 4)?;
-                Ok((src, dst))
-            }
-            6 => {
-                if data.len() < 40 {
-                    return Err(Error::Parse("Truncated IPv6 header"))
-                }
-                let src = Address::read_from_fixed(&data[8..], 16)?;
-                let dst = Address::read_from_fixed(&data[24..], 16)?;
-                Ok((src, dst))
-            }
-            _ => Err(Error::Parse("Invalid version"))
-        }
-    }
-}
-
-
-struct RoutingEntry {
-    address: SocketAddr,
-    bytes: Address,
-    prefix_len: u8
-}
-
-type Hash = BuildHasherDefault<FnvHasher>;
-
-/// A prefix-based routing table
-///
-/// This table contains a mapping of prefixes associated with peer addresses.
-/// To speed up lookup, prefixes are grouped into full bytes and map to a list of prefixes with
-/// more fine grained prefixes.
-#[derive(Default)]
-pub struct RoutingTable(HashMap<[u8; 16], Vec<RoutingEntry>, Hash>);
-
-impl RoutingTable {
-    /// Creates a new empty routing table
-    pub fn new() -> Self {
-        RoutingTable(HashMap::default())
-    }
-}
-
-impl Table for RoutingTable {
-    /// Learns the given address, inserting it in the hash map
-    fn learn(&mut self, addr: Address, prefix_len: Option<u8>, address: SocketAddr) {
-        // If prefix length is not set, treat the whole addess as significant
-        let prefix_len = match prefix_len {
-            Some(val) => val,
-            None => addr.len * 8
-        };
-        info!("New routing entry: {}/{} => {}", addr, prefix_len, address);
-        // Round the prefix length down to the next multiple of 8 and extraxt a prefix of that
-        // length.
-        let group_len = prefix_len as usize / 8;
-        assert!(group_len <= 16);
-        let mut group_bytes = [0; 16];
-        group_bytes[..group_len].copy_from_slice(&addr.data[..group_len]);
-        // Create an entry
-        let routing_entry = RoutingEntry { address, bytes: addr, prefix_len };
-        // Add the entry to the routing table, creating a new list of the prefix group is empty.
-        match self.0.entry(group_bytes) {
-            hash_map::Entry::Occupied(mut entry) => entry.get_mut().push(routing_entry),
-            hash_map::Entry::Vacant(entry) => {
-                entry.insert(vec![routing_entry]);
-            }
-        }
-    }
-
-    /// Retrieves a peer for an address if it is inside the routing table
-    #[allow(unknown_lints, clippy::needless_range_loop)]
-    fn lookup(&mut self, addr: &Address) -> Option<SocketAddr> {
-        let len = addr.len as usize;
-        let mut found = None;
-        let mut found_len: isize = -1;
-        // Iterate over the prefix length from longest prefix group to shortest (empty) prefix
-        // group
-        let mut group_bytes = addr.data;
-        for i in len..16 {
-            group_bytes[i] = 0;
-        }
-        for i in (0..=len).rev() {
-            if i < len {
-                group_bytes[i] = 0;
-            }
-            if let Some(group) = self.0.get(&group_bytes) {
-                // If the group is not empty, check every entry
-                for entry in group {
-                    // Calculate the match length of the address and the prefix
-                    let mut match_len = 0;
-                    for j in 0..addr.len as usize {
-                        let b = addr.data[j] ^ entry.bytes.data[j];
-                        if b == 0 {
-                            match_len += 8;
-                        } else {
-                            match_len += b.leading_zeros();
-                            break
-                        }
-                    }
-                    // If the full prefix matches and the match is longer than the longest prefix
-                    // found so far, remember the peer
-                    if match_len as u8 >= entry.prefix_len && entry.prefix_len as isize > found_len {
-                        found = Some(entry.address);
-                        found_len = entry.prefix_len as isize;
-                    }
-                }
-            }
-        }
-        // Return the longest match found (if any).
-        found
-    }
-
-    /// This method does not do anything.
-    fn housekeep(&mut self) {
-        // nothing to do
-    }
-
-    /// Write out the table
-    fn write_out<W: Write>(&self, out: &mut W) -> Result<(), io::Error> {
-        writeln!(out, "Routing table:")?;
-        for entries in self.0.values() {
-            for entry in entries {
-                writeln!(out, " - {}/{} => {}", entry.bytes, entry.prefix_len, entry.address)?;
-            }
-        }
-        Ok(())
-    }
-
-    /// Removes an address from the map and returns whether something has been removed
-    #[inline]
-    fn remove(&mut self, _addr: &Address) -> bool {
-        // Do nothing, removing single address from prefix-based routing tables does not make sense
-        false
-    }
-
-    /// Removed all addresses associated with a certain peer
-    fn remove_all(&mut self, addr: &SocketAddr) {
-        for entry in &mut self.0.values_mut() {
-            entry.retain(|entr| &entr.address != addr);
-        }
-    }
-}
-
-
-#[cfg(test)] use std::net::ToSocketAddrs;
-#[cfg(test)] use std::str::FromStr;
-
-
-#[test]
-fn decode_ipv4_packet() {
-    let data = [0x40, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 192, 168, 1, 1, 192, 168, 1, 2];
-    let (src, dst) = Packet::parse(&data).unwrap();
-    assert_eq!(src, Address { data: [192, 168, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0], len: 4 });
-    assert_eq!(dst, Address { data: [192, 168, 1, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0], len: 4 });
-}
-
-#[test]
-fn decode_ipv6_packet() {
-    let data = [
-        0x60, 0, 0, 0, 0, 0, 0, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 0, 1, 2, 3, 4, 5, 6, 0, 9, 8, 7, 6, 5, 4, 3, 2, 1, 6, 5,
-        4, 3, 2, 1
-    ];
-    let (src, dst) = Packet::parse(&data).unwrap();
-    assert_eq!(src, Address { data: [1, 2, 3, 4, 5, 6, 7, 8, 9, 0, 1, 2, 3, 4, 5, 6], len: 16 });
-    assert_eq!(dst, Address { data: [0, 9, 8, 7, 6, 5, 4, 3, 2, 1, 6, 5, 4, 3, 2, 1], len: 16 });
-}
-
-#[test]
-fn decode_invalid_packet() {
-    assert!(Packet::parse(&[0x40, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 192, 168, 1, 1, 192, 168, 1, 2]).is_ok());
-    assert!(Packet::parse(&[
-        0x60, 0, 0, 0, 0, 0, 0, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 0, 1, 2, 3, 4, 5, 6, 0, 9, 8, 7, 6, 5, 4, 3, 2, 1, 6, 5,
-        4, 3, 2, 1
-    ])
-    .is_ok());
-    // no data
-    assert!(Packet::parse(&[]).is_err());
-    // wrong version
-    assert!(Packet::parse(&[0x20]).is_err());
-    // truncated ipv4
-    assert!(Packet::parse(&[0x40, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 192, 168, 1, 1, 192, 168, 1]).is_err());
-    // truncated ipv6
-    assert!(Packet::parse(&[
-        0x60, 0, 0, 0, 0, 0, 0, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 0, 1, 2, 3, 4, 5, 6, 0, 9, 8, 7, 6, 5, 4, 3, 2, 1, 6, 5,
-        4, 3, 2
-    ])
-    .is_err());
-}
-
-
-#[test]
-fn routing_table_ipv4() {
-    let mut table = RoutingTable::new();
-    let peer1 = "1.2.3.4:1".to_socket_addrs().unwrap().next().unwrap();
-    let peer2 = "1.2.3.4:2".to_socket_addrs().unwrap().next().unwrap();
-    let peer3 = "1.2.3.4:3".to_socket_addrs().unwrap().next().unwrap();
-    assert!(table.lookup(&Address::from_str("192.168.1.1").unwrap()).is_none());
-    table.learn(Address::from_str("192.168.1.1").unwrap(), Some(32), peer1.clone());
-    assert_eq!(table.lookup(&Address::from_str("192.168.1.1").unwrap()), Some(peer1));
-    table.learn(Address::from_str("192.168.1.2").unwrap(), None, peer2.clone());
-    assert_eq!(table.lookup(&Address::from_str("192.168.1.1").unwrap()), Some(peer1));
-    assert_eq!(table.lookup(&Address::from_str("192.168.1.2").unwrap()), Some(peer2));
-    table.learn(Address::from_str("192.168.1.0").unwrap(), Some(24), peer3.clone());
-    assert_eq!(table.lookup(&Address::from_str("192.168.1.1").unwrap()), Some(peer1));
-    assert_eq!(table.lookup(&Address::from_str("192.168.1.2").unwrap()), Some(peer2));
-    assert_eq!(table.lookup(&Address::from_str("192.168.1.3").unwrap()), Some(peer3));
-    table.learn(Address::from_str("192.168.0.0").unwrap(), Some(16), peer1.clone());
-    assert_eq!(table.lookup(&Address::from_str("192.168.2.1").unwrap()), Some(peer1));
-    assert_eq!(table.lookup(&Address::from_str("192.168.1.1").unwrap()), Some(peer1));
-    assert_eq!(table.lookup(&Address::from_str("192.168.1.2").unwrap()), Some(peer2));
-    assert_eq!(table.lookup(&Address::from_str("192.168.1.3").unwrap()), Some(peer3));
-    table.learn(Address::from_str("0.0.0.0").unwrap(), Some(0), peer2.clone());
-    assert_eq!(table.lookup(&Address::from_str("192.168.2.1").unwrap()), Some(peer1));
-    assert_eq!(table.lookup(&Address::from_str("192.168.1.1").unwrap()), Some(peer1));
-    assert_eq!(table.lookup(&Address::from_str("192.168.1.2").unwrap()), Some(peer2));
-    assert_eq!(table.lookup(&Address::from_str("192.168.1.3").unwrap()), Some(peer3));
-    assert_eq!(table.lookup(&Address::from_str("1.2.3.4").unwrap()), Some(peer2));
-    table.learn(Address::from_str("192.168.2.0").unwrap(), Some(27), peer3.clone());
-    assert_eq!(table.lookup(&Address::from_str("192.168.2.31").unwrap()), Some(peer3));
-    assert_eq!(table.lookup(&Address::from_str("192.168.2.32").unwrap()), Some(peer1));
-    table.learn(Address::from_str("192.168.2.0").unwrap(), Some(28), peer3.clone());
-    assert_eq!(table.lookup(&Address::from_str("192.168.2.1").unwrap()), Some(peer3));
-}
-
-#[test]
-fn routing_table_ipv6() {
-    let mut table = RoutingTable::new();
-    let peer1 = "::1:1".to_socket_addrs().unwrap().next().unwrap();
-    let peer2 = "::1:2".to_socket_addrs().unwrap().next().unwrap();
-    let peer3 = "::1:3".to_socket_addrs().unwrap().next().unwrap();
-    assert!(table.lookup(&Address::from_str("::1").unwrap()).is_none());
-    table.learn(Address::from_str("dead:beef:dead:beef:dead:beef:dead:1").unwrap(), Some(128), peer1.clone());
-    assert_eq!(table.lookup(&Address::from_str("dead:beef:dead:beef:dead:beef:dead:1").unwrap()), Some(peer1));
-    table.learn(Address::from_str("dead:beef:dead:beef:dead:beef:dead:2").unwrap(), None, peer2.clone());
-    assert_eq!(table.lookup(&Address::from_str("dead:beef:dead:beef:dead:beef:dead:1").unwrap()), Some(peer1));
-    assert_eq!(table.lookup(&Address::from_str("dead:beef:dead:beef:dead:beef:dead:2").unwrap()), Some(peer2));
-    table.learn(Address::from_str("dead:beef:dead:beef::").unwrap(), Some(64), peer3.clone());
-    assert_eq!(table.lookup(&Address::from_str("dead:beef:dead:beef:dead:beef:dead:1").unwrap()), Some(peer1));
-    assert_eq!(table.lookup(&Address::from_str("dead:beef:dead:beef:dead:beef:dead:2").unwrap()), Some(peer2));
-    assert_eq!(table.lookup(&Address::from_str("dead:beef:dead:beef:dead:beef:dead:3").unwrap()), Some(peer3));
-    table.learn(Address::from_str("dead:beef:dead:be00::").unwrap(), Some(56), peer1.clone());
-    assert_eq!(table.lookup(&Address::from_str("dead:beef:dead:beef:dead:beef:1::").unwrap()), Some(peer3));
-    assert_eq!(table.lookup(&Address::from_str("dead:beef:dead:be01::").unwrap()), Some(peer1));
-    assert_eq!(table.lookup(&Address::from_str("dead:beef:dead:beef:dead:beef:dead:1").unwrap()), Some(peer1));
-    assert_eq!(table.lookup(&Address::from_str("dead:beef:dead:beef:dead:beef:dead:2").unwrap()), Some(peer2));
-    assert_eq!(table.lookup(&Address::from_str("dead:beef:dead:beef:dead:beef:dead:3").unwrap()), Some(peer3));
-    table.learn(Address::from_str("::").unwrap(), Some(0), peer2.clone());
-    assert_eq!(table.lookup(&Address::from_str("dead:beef:dead:beef:dead:beef:1::").unwrap()), Some(peer3));
-    assert_eq!(table.lookup(&Address::from_str("dead:beef:dead:be01::").unwrap()), Some(peer1));
-    assert_eq!(table.lookup(&Address::from_str("dead:beef:dead:beef:dead:beef:dead:1").unwrap()), Some(peer1));
-    assert_eq!(table.lookup(&Address::from_str("dead:beef:dead:beef:dead:beef:dead:2").unwrap()), Some(peer2));
-    assert_eq!(table.lookup(&Address::from_str("dead:beef:dead:beef:dead:beef:dead:3").unwrap()), Some(peer3));
-    assert_eq!(table.lookup(&Address::from_str("::1").unwrap()), Some(peer2));
-    table.learn(Address::from_str("dead:beef:dead:beef:dead:beef:dead:be00").unwrap(), Some(123), peer2.clone());
-    assert_eq!(table.lookup(&Address::from_str("dead:beef:dead:beef:dead:beef:dead:be1f").unwrap()), Some(peer2));
-    assert_eq!(table.lookup(&Address::from_str("dead:beef:dead:beef:dead:beef:dead:be20").unwrap()), Some(peer3));
-    table.learn(Address::from_str("dead:beef:dead:beef:dead:beef:dead:be00").unwrap(), Some(124), peer3.clone());
-    assert_eq!(table.lookup(&Address::from_str("dead:beef:dead:beef:dead:beef:dead:be01").unwrap()), Some(peer3));
-}

src/main.rs

@@ -1,14 +1,14 @@
 // VpnCloud - Peer-to-Peer VPN
-// Copyright (C) 2015-2019  Dennis Schwerdel
+// Copyright (C) 2015-2021  Dennis Schwerdel
 // This software is licensed under GPL-3 or newer (see LICENSE.md)
 
-#![cfg_attr(feature = "bench", feature(test))]
+#[macro_use]
+extern crate log;
+#[macro_use]
+extern crate serde;
 
-#[macro_use] extern crate log;
-#[macro_use] extern crate serde_derive;
-
-#[cfg(test)] extern crate tempfile;
-#[cfg(feature = "bench")] extern crate test;
+#[cfg(test)]
+extern crate tempfile;
 
 #[macro_use]
 pub mod util;
@@ -16,96 +16,69 @@ pub mod util;
 #[macro_use]
 mod tests;
 pub mod beacon;
-#[cfg(feature = "bench")] mod benches;
 pub mod cloud;
 pub mod config;
 pub mod crypto;
 pub mod device;
-pub mod ethernet;
-pub mod ip;
+pub mod error;
+#[cfg(feature = "installer")]
+pub mod installer;
+pub mod messages;
 pub mod net;
+pub mod oldconfig;
+pub mod payload;
 pub mod poll;
 pub mod port_forwarding;
+pub mod table;
 pub mod traffic;
 pub mod types;
-pub mod udpmessage;
+#[cfg(feature = "wizard")]
+pub mod wizard;
+#[cfg(feature = "websocket")]
+pub mod wsproxy;
 
-use docopt::Docopt;
+use structopt::StructOpt;
 
 use std::{
-    fs::File,
+    fs::{self, File, Permissions},
     io::{self, Write},
-    net::UdpSocket,
+    net::{Ipv4Addr, UdpSocket},
+    os::unix::fs::PermissionsExt,
     path::Path,
-    process::Command,
+    process,
     str::FromStr,
-    sync::Mutex
+    sync::Mutex,
 };
 
 use crate::{
     cloud::GenericCloud,
-    config::Config,
-    crypto::{Crypto, CryptoMethod},
+    config::{Args, Command, Config, DEFAULT_PORT},
+    crypto::Crypto,
     device::{Device, TunTapDevice, Type},
-    ethernet::SwitchTable,
-    ip::RoutingTable,
-    port_forwarding::PortForwarding,
-    types::{Error, HeaderMagic, Mode, Protocol, Range},
-    util::{Duration, SystemTimeSource}
+    net::Socket,
+    oldconfig::OldConfigFile,
+    payload::Protocol,
+    util::SystemTimeSource,
 };
 
-
-const VERSION: u8 = 1;
-const MAGIC: HeaderMagic = *b"vpn\x01";
-
-static USAGE: &'static str = include_str!("usage.txt");
-
-
-#[derive(Deserialize, Debug, Default)]
-pub struct Args {
-    flag_config: Option<String>,
-    flag_type: Option<Type>,
-    flag_device_path: Option<String>,
-    flag_mode: Option<Mode>,
-    flag_shared_key: Option<String>,
-    flag_crypto: Option<CryptoMethod>,
-    flag_subnet: Vec<String>,
-    flag_device: Option<String>,
-    flag_listen: Option<u16>,
-    flag_network_id: Option<String>,
-    flag_magic: Option<String>,
-    flag_connect: Vec<String>,
-    flag_peer_timeout: Option<Duration>,
-    flag_keepalive: Option<Duration>,
-    flag_dst_timeout: Option<Duration>,
-    flag_beacon_store: Option<String>,
-    flag_beacon_load: Option<String>,
-    flag_beacon_interval: Option<Duration>,
-    flag_verbose: bool,
-    flag_quiet: bool,
-    flag_ifup: Option<String>,
-    flag_ifdown: Option<String>,
-    flag_version: bool,
-    flag_no_port_forwarding: bool,
-    flag_daemon: bool,
-    flag_pid_file: Option<String>,
-    flag_stats_file: Option<String>,
-    flag_user: Option<String>,
-    flag_group: Option<String>,
-    flag_log_file: Option<String>
-}
+#[cfg(feature = "websocket")]
+use crate::wsproxy::ProxyConnection;
 
 struct DualLogger {
-    file: Mutex<Option<File>>
+    file: Option<Mutex<File>>,
 }
 
 impl DualLogger {
     pub fn new<P: AsRef<Path>>(path: Option<P>) -> Result<Self, io::Error> {
         if let Some(path) = path {
+            let path = path.as_ref();
+            if path.exists() {
+                fs::remove_file(path)?
+            }
             let file = File::create(path)?;
-            Ok(DualLogger { file: Mutex::new(Some(file)) })
+            Ok(DualLogger { file: Some(Mutex::new(file)) })
         } else {
-            Ok(DualLogger { file: Mutex::new(None) })
+            Ok(DualLogger { file: None })
         }
     }
 }
@@ -120,9 +93,9 @@ impl log::Log for DualLogger {
     fn log(&self, record: &log::Record) {
         if self.enabled(record.metadata()) {
             println!("{} - {}", record.level(), record.args());
-            let mut file = self.file.lock().expect("Lock poisoned");
-            if let Some(ref mut file) = *file {
-                let time = time::strftime("%F %T", &time::now()).expect("Failed to format timestamp");
+            if let Some(ref file) = self.file {
+                let mut file = file.lock().expect("Lock poisoned");
+                let time = chrono::Local::now().format("%F %H:%M:%S");
                 writeln!(file, "{} - {} - {}", time, record.level(), record.args())
                     .expect("Failed to write to logfile");
             }
@@ -131,16 +104,16 @@ impl log::Log for DualLogger {
 
     #[inline]
     fn flush(&self) {
-        let mut file = self.file.lock().expect("Lock poisoned");
-        if let Some(ref mut file) = *file {
+        if let Some(ref file) = self.file {
+            let mut file = file.lock().expect("Lock poisoned");
             try_fail!(file.flush(), "Logging error: {}");
         }
     }
 }
 
 fn run_script(script: &str, ifname: &str) {
-    let mut cmd = Command::new("sh");
-    cmd.arg("-c").arg(&script).env("IFNAME", ifname);
+    let mut cmd = process::Command::new("sh");
+    cmd.arg("-c").arg(script).env("IFNAME", ifname);
     debug!("Running script: {:?}", cmd);
     match cmd.status() {
         Ok(status) => {
@@ -148,85 +121,25 @@ fn run_script(script: &str, ifname: &str) {
                 error!("Script returned with error: {:?}", status.code())
             }
         }
-        Err(e) => error!("Failed to execute script {:?}: {}", script, e)
+        Err(e) => error!("Failed to execute script {:?}: {}", script, e),
     }
 }
 
-enum AnyTable {
-    Switch(SwitchTable<SystemTimeSource>),
-    Routing(RoutingTable)
+fn parse_ip_netmask(addr: &str) -> Result<(Ipv4Addr, Ipv4Addr), String> {
+    let (ip_str, len_str) = match addr.find('/') {
+        Some(pos) => (&addr[..pos], &addr[pos + 1..]),
+        None => (addr, "24"),
+    };
+    let prefix_len = u8::from_str(len_str).map_err(|_| format!("Invalid prefix length: {}", len_str))?;
+    if prefix_len > 32 {
+        return Err(format!("Invalid prefix length: {}", prefix_len));
+    }
+    let ip = Ipv4Addr::from_str(ip_str).map_err(|_| format!("Invalid ip address: {}", ip_str))?;
+    let netmask = Ipv4Addr::from(u32::max_value().checked_shl(32 - prefix_len as u32).unwrap());
+    Ok((ip, netmask))
 }
 
-enum AnyCloud<P: Protocol> {
-    Switch(GenericCloud<TunTapDevice, P, SwitchTable<SystemTimeSource>, UdpSocket, SystemTimeSource>),
-    Routing(GenericCloud<TunTapDevice, P, RoutingTable, UdpSocket, SystemTimeSource>)
-}
-
-impl<P: Protocol> AnyCloud<P> {
-    #[allow(unknown_lints, clippy::too_many_arguments)]
-    fn new(
-        config: &Config, device: TunTapDevice, table: AnyTable, learning: bool, broadcast: bool, addresses: Vec<Range>,
-        crypto: Crypto, port_forwarding: Option<PortForwarding>
-    ) -> Self
-    {
-        match table {
-            AnyTable::Switch(t) => {
-                AnyCloud::Switch(GenericCloud::<
-                    TunTapDevice,
-                    P,
-                    SwitchTable<SystemTimeSource>,
-                    UdpSocket,
-                    SystemTimeSource
-                >::new(
-                    config, device, t, learning, broadcast, addresses, crypto, port_forwarding
-                ))
-            }
-            AnyTable::Routing(t) => {
-                AnyCloud::Routing(GenericCloud::<TunTapDevice, P, RoutingTable, UdpSocket, SystemTimeSource>::new(
-                    config,
-                    device,
-                    t,
-                    learning,
-                    broadcast,
-                    addresses,
-                    crypto,
-                    port_forwarding
-                ))
-            }
-        }
-    }
-
-    fn ifname(&self) -> &str {
-        match *self {
-            AnyCloud::Switch(ref c) => c.ifname(),
-            AnyCloud::Routing(ref c) => c.ifname()
-        }
-    }
-
-    fn run(&mut self) {
-        match *self {
-            AnyCloud::Switch(ref mut c) => c.run(),
-            AnyCloud::Routing(ref mut c) => c.run()
-        }
-    }
-
-    fn connect(&mut self, a: &str) -> Result<(), Error> {
-        match *self {
-            AnyCloud::Switch(ref mut c) => c.connect(a),
-            AnyCloud::Routing(ref mut c) => c.connect(a)
-        }
-    }
-
-    fn add_reconnect_peer(&mut self, a: String) {
-        match *self {
-            AnyCloud::Switch(ref mut c) => c.add_reconnect_peer(a),
-            AnyCloud::Routing(ref mut c) => c.add_reconnect_peer(a)
-        }
-    }
-}
-
-
-fn run<P: Protocol>(config: Config) {
+fn setup_device(config: &Config) -> TunTapDevice {
     let device = try_fail!(
         TunTapDevice::new(&config.device_name, config.device_type, config.device_path.as_ref().map(|s| s as &str)),
         "Failed to open virtual {} interface {}: {}",
@@ -234,33 +147,56 @@ fn run<P: Protocol>(config: Config) {
         config.device_name
     );
     info!("Opened device {}", device.ifname());
-    let mut ranges = Vec::with_capacity(config.subnets.len());
-    for s in &config.subnets {
-        ranges.push(try_fail!(Range::from_str(s), "Invalid subnet format: {} ({})", s));
+    config.call_hook("device_setup", vec![("IFNAME", device.ifname())], true);
+    if let Err(err) = device.set_mtu(None) {
+        error!("Error setting optimal MTU on {}: {}", device.ifname(), err);
     }
-    let dst_timeout = config.dst_timeout;
-    let (learning, broadcasting, table) = match config.mode {
-        Mode::Normal => {
-            match config.device_type {
-                Type::Tap => (true, true, AnyTable::Switch(SwitchTable::new(dst_timeout, 10))),
-                Type::Tun => (false, false, AnyTable::Routing(RoutingTable::new())),
-                Type::Dummy => (false, false, AnyTable::Switch(SwitchTable::new(dst_timeout, 10)))
-            }
+    if let Some(ip) = &config.ip {
+        let (ip, netmask) = try_fail!(parse_ip_netmask(ip), "Invalid ip address given: {}");
+        info!("Configuring device with ip {}, netmask {}", ip, netmask);
+        try_fail!(device.configure(ip, netmask), "Failed to configure device: {}");
+    }
+    if let Some(script) = &config.ifup {
+        run_script(script, device.ifname());
+    }
+    if config.fix_rp_filter {
+        try_fail!(device.fix_rp_filter(), "Failed to change rp_filter settings: {}");
+    }
+    if let Ok(val) = device.get_rp_filter() {
+        if val != 1 {
+            warn!("Your networking configuration might be affected by a vulnerability (https://vpncloud.ddswd.de/docs/security/cve-2019-14899/), please change your rp_filter setting to 1 (currently {}).", val);
         }
-        Mode::Router => (false, false, AnyTable::Routing(RoutingTable::new())),
-        Mode::Switch => (true, true, AnyTable::Switch(SwitchTable::new(dst_timeout, 10))),
-        Mode::Hub => (false, true, AnyTable::Switch(SwitchTable::new(dst_timeout, 10)))
-    };
-    let crypto = match config.shared_key {
-        Some(ref key) => Crypto::from_shared_key(config.crypto, key),
-        None => Crypto::None
-    };
-    let port_forwarding = if config.port_forwarding { PortForwarding::new(config.port) } else { None };
-    let mut cloud = AnyCloud::<P>::new(&config, device, table, learning, broadcasting, ranges, crypto, port_forwarding);
-    if let Some(script) = config.ifup {
-        run_script(&script, cloud.ifname());
     }
-    for addr in config.peers {
+    config.call_hook("device_configured", vec![("IFNAME", device.ifname())], true);
+    device
+}
+
+#[allow(clippy::cognitive_complexity)]
+fn run<P: Protocol, S: Socket>(config: Config, socket: S) {
+    let device = setup_device(&config);
+    let port_forwarding = if config.port_forwarding { socket.create_port_forwarding() } else { None };
+    let stats_file = match config.stats_file {
+        None => None,
+        Some(ref name) => {
+            let path = Path::new(name);
+            if path.exists() {
+                try_fail!(fs::remove_file(path), "Failed to remove file {}: {}", name);
+            }
+            let file = try_fail!(File::create(name), "Failed to create stats file: {}");
+            try_fail!(
+                fs::set_permissions(name, Permissions::from_mode(0o644)),
+                "Failed to set permissions on stats file: {}"
+            );
+            Some(file)
+        }
+    };
+    let mut cloud =
+        GenericCloud::<TunTapDevice, P, S, SystemTimeSource>::new(&config, socket, device, port_forwarding, stats_file);
+    for mut addr in config.peers {
+        if addr.find(':').unwrap_or(0) <= addr.find(']').unwrap_or(0) {
+            // : not present or only in IPv6 address
+            addr = format!("{}:{}", addr, DEFAULT_PORT)
+        }
         try_fail!(cloud.connect(&addr as &str), "Failed to send message to {}: {}", &addr);
         cloud.add_reconnect_peer(addr);
     }
@@ -277,6 +213,16 @@ fn run<P: Protocol>(config: Config) {
             daemonize = daemonize.pid_file(pid_file).chown_pid_file(true);
         }
         try_fail!(daemonize.start(), "Failed to daemonize: {}");
+    } else if config.user.is_some() || config.group.is_some() {
+        info!("Dropping privileges");
+        let mut pd = privdrop::PrivDrop::default();
+        if let Some(user) = config.user {
+            pd = pd.user(user);
+        }
+        if let Some(group) = config.group {
+            pd = pd.group(group);
+        }
+        try_fail!(pd.apply(), "Failed to drop privileges: {}");
     }
     cloud.run();
     if let Some(script) = config.ifdown {
@@ -285,33 +231,109 @@ fn run<P: Protocol>(config: Config) {
 }
 
 fn main() {
-    let args: Args = Docopt::new(USAGE).and_then(|d| d.deserialize()).unwrap_or_else(|e| e.exit());
-    if args.flag_version {
-        println!("VpnCloud v{}, protocol version {}", env!("CARGO_PKG_VERSION"), VERSION);
-        return
+    let args: Args = Args::from_args();
+    if args.version {
+        println!("VpnCloud v{}", env!("CARGO_PKG_VERSION"));
+        return;
     }
-    let logger = try_fail!(DualLogger::new(args.flag_log_file.as_ref()), "Failed to open logfile: {}");
+    let logger = try_fail!(DualLogger::new(args.log_file.as_ref()), "Failed to open logfile: {}");
     log::set_boxed_logger(Box::new(logger)).unwrap();
-    assert!(!args.flag_verbose || !args.flag_quiet);
-    log::set_max_level(if args.flag_verbose {
+    assert!(!args.verbose || !args.quiet);
+    log::set_max_level(if args.verbose {
         log::LevelFilter::Debug
-    } else if args.flag_quiet {
+    } else if args.quiet {
         log::LevelFilter::Error
     } else {
         log::LevelFilter::Info
     });
+    if let Some(cmd) = args.cmd {
+        match cmd {
+            Command::GenKey { password } => {
+                let (privkey, pubkey) = Crypto::generate_keypair(password.as_deref());
+                println!("Private key: {}\nPublic key: {}\n", privkey, pubkey);
+                println!(
+                    "Attention: Keep the private key secret and use only the public key on other nodes to establish trust."
+                );
+            }
+            Command::MigrateConfig { config_file } => {
+                info!("Trying to convert from old config format");
+                let f = try_fail!(File::open(&config_file), "Failed to open config file: {:?}");
+                let config_file_old: OldConfigFile =
+                    try_fail!(serde_yaml::from_reader(f), "Config file not valid for version 1: {:?}");
+                let new_config = config_file_old.convert();
+                info!("Successfully converted from old format");
+                info!("Renaming original file to {}.orig", config_file);
+                try_fail!(
+                    fs::rename(&config_file, format!("{}.orig", config_file)),
+                    "Failed to rename original file: {:?}"
+                );
+                info!("Writing new config back into {}", config_file);
+                let f = try_fail!(File::create(&config_file), "Failed to open config file: {:?}");
+                try_fail!(
+                    fs::set_permissions(&config_file, fs::Permissions::from_mode(0o600)),
+                    "Failed to set permissions on file: {:?}"
+                );
+                try_fail!(serde_yaml::to_writer(f, &new_config), "Failed to write converted config: {:?}");
+            }
+            Command::Completion { shell } => {
+                Args::clap().gen_completions_to(env!("CARGO_PKG_NAME"), shell, &mut io::stdout());
+            }
+            #[cfg(feature = "websocket")]
+            Command::WsProxy { listen } => {
+                try_fail!(wsproxy::run_proxy(&listen), "Failed to run websocket proxy: {:?}");
+            }
+            #[cfg(feature = "wizard")]
+            Command::Config { name } => {
+                try_fail!(wizard::configure(name), "Wizard failed: {}");
+            }
+            #[cfg(feature = "installer")]
+            Command::Install { uninstall } => {
+                if uninstall {
+                    try_fail!(installer::uninstall(), "Uninstall failed: {}");
+                } else {
+                    try_fail!(installer::install(), "Install failed: {}");
+                }
+            }
+        }
+        return;
+    }
     let mut config = Config::default();
-    if let Some(ref file) = args.flag_config {
+    if let Some(ref file) = args.config {
         info!("Reading config file '{}'", file);
         let f = try_fail!(File::open(file), "Failed to open config file: {:?}");
-        let config_file = try_fail!(serde_yaml::from_reader(f), "Failed to load config file: {:?}");
+        let config_file = match serde_yaml::from_reader(f) {
+            Ok(config) => config,
+            Err(err) => {
+                error!("Failed to read config file: {}", err);
+                info!("Trying to convert from old config format");
+                let f = try_fail!(File::open(file), "Failed to open config file: {:?}");
+                let config_file_old: OldConfigFile =
+                    try_fail!(serde_yaml::from_reader(f), "Config file is neither version 2 nor version 1: {:?}");
+                let new_config = config_file_old.convert();
+                info!("Successfully converted from old format, please migrate your config using migrate-config");
+                new_config
+            }
+        };
         config.merge_file(config_file)
     }
     config.merge_args(args);
     debug!("Config: {:?}", config);
+    if config.crypto.password.is_none() && config.crypto.private_key.is_none() {
+        error!("Either password or private key must be set in config or given as parameter");
+        return;
+    }
+    #[cfg(feature = "websocket")]
+    if config.listen.starts_with("ws://") {
+        let socket = try_fail!(ProxyConnection::listen(&config.listen), "Failed to open socket {}: {}", config.listen);
+        match config.device_type {
+            Type::Tap => run::<payload::Frame, _>(config, socket),
+            Type::Tun => run::<payload::Packet, _>(config, socket),
+        }
+        return;
+    }
+    let socket = try_fail!(UdpSocket::listen(&config.listen), "Failed to open socket {}: {}", config.listen);
     match config.device_type {
-        Type::Tap => run::<ethernet::Frame>(config),
-        Type::Tun => run::<ip::Packet>(config),
-        Type::Dummy => run::<ethernet::Frame>(config)
+        Type::Tap => run::<payload::Frame, _>(config, socket),
+        Type::Tun => run::<payload::Packet, _>(config, socket),
     }
 }

src/messages.rs

@@ -0,0 +1,265 @@
+// VpnCloud - Peer-to-Peer VPN
+// Copyright (C) 2015-2021  Dennis Schwerdel
+// This software is licensed under GPL-3 or newer (see LICENSE.md)
+
+use crate::{
+    crypto::Payload,
+    error::Error,
+    types::{NodeId, Range, RangeList, NODE_ID_BYTES},
+    util::MsgBuffer,
+};
+use byteorder::{NetworkEndian, ReadBytesExt, WriteBytesExt};
+use smallvec::{smallvec, SmallVec};
+use std::{
+    io::{self, Cursor, Read, Seek, SeekFrom, Take, Write},
+    net::{Ipv4Addr, Ipv6Addr, SocketAddr, SocketAddrV4, SocketAddrV6},
+};
+
+pub const MESSAGE_TYPE_DATA: u8 = 0;
+pub const MESSAGE_TYPE_NODE_INFO: u8 = 1;
+pub const MESSAGE_TYPE_KEEPALIVE: u8 = 2;
+pub const MESSAGE_TYPE_CLOSE: u8 = 0xff;
+
+pub type AddrList = SmallVec<[SocketAddr; 4]>;
+pub type PeerList = SmallVec<[PeerInfo; 16]>;
+
+#[derive(Debug, PartialEq)]
+pub struct PeerInfo {
+    pub node_id: Option<NodeId>,
+    pub addrs: AddrList,
+}
+
+#[derive(Debug, PartialEq)]
+pub struct NodeInfo {
+    pub node_id: NodeId,
+    pub peers: PeerList,
+    pub claims: RangeList,
+    pub peer_timeout: Option<u16>,
+    pub addrs: AddrList,
+}
+
+impl NodeInfo {
+    const PART_CLAIMS: u8 = 2;
+    const PART_END: u8 = 0;
+    const PART_NODEID: u8 = 4;
+    const PART_PEERS: u8 = 1;
+    const PART_PEER_TIMEOUT: u8 = 3;
+    const PART_ADDRS: u8 = 5;
+
+    fn read_addr_list<R: Read>(r: &mut Take<R>) -> Result<AddrList, io::Error> {
+        let flags = r.read_u8()?;
+        Self::read_addr_list_inner(r, flags)
+    }
+
+    fn read_addr_list_inner<R: Read>(r: &mut Take<R>, flags: u8) -> Result<AddrList, io::Error> {
+        let num_ipv4_addrs = (flags & 0x07) as usize;
+        let num_ipv6_addrs = (flags & 0x38) as usize / 8;
+        let mut addrs = SmallVec::with_capacity(num_ipv4_addrs + num_ipv6_addrs);
+        for _ in 0..num_ipv6_addrs {
+            let mut ip = [0u8; 16];
+            r.read_exact(&mut ip)?;
+            let port = r.read_u16::<NetworkEndian>()?;
+            let addr = SocketAddr::V6(SocketAddrV6::new(Ipv6Addr::from(ip), port, 0, 0));
+            addrs.push(addr);
+        }
+        for _ in 0..num_ipv4_addrs {
+            let mut ip = [0u8; 4];
+            r.read_exact(&mut ip)?;
+            let port = r.read_u16::<NetworkEndian>()?;
+            let addr = SocketAddr::V4(SocketAddrV4::new(Ipv4Addr::from(ip), port));
+            addrs.push(addr);
+        }
+        Ok(addrs)
+    }
+
+    fn decode_peer_list_part<R: Read>(r: &mut Take<R>) -> Result<PeerList, io::Error> {
+        let mut peers = smallvec![];
+        while r.limit() > 0 {
+            let flags = r.read_u8()?;
+            let has_node_id = (flags & 0x80) != 0;
+            let mut node_id = None;
+            if has_node_id {
+                let mut id = [0; NODE_ID_BYTES];
+                r.read_exact(&mut id)?;
+                node_id = Some(id)
+            }
+            let addrs = Self::read_addr_list_inner(r, flags)?;
+            peers.push(PeerInfo { addrs, node_id })
+        }
+        Ok(peers)
+    }
+
+    fn decode_claims_part<R: Read>(mut r: &mut Take<R>) -> Result<RangeList, Error> {
+        let mut claims = smallvec![];
+        while r.limit() > 0 {
+            claims.push(Range::read_from(&mut r)?);
+        }
+        Ok(claims)
+    }
+
+    fn decode_internal<R: Read>(mut r: R) -> Result<Self, Error> {
+        let mut peers = smallvec![];
+        let mut claims = smallvec![];
+        let mut peer_timeout = None;
+        let mut node_id = None;
+        let mut addrs = smallvec![];
+        loop {
+            let part = r.read_u8().map_err(|_| Error::Message("Truncated message"))?;
+            if part == Self::PART_END {
+                break;
+            }
+            let part_len = r.read_u16::<NetworkEndian>().map_err(|_| Error::Message("Truncated message"))? as usize;
+            let mut rp = r.take(part_len as u64);
+            match part {
+                Self::PART_PEERS => {
+                    peers = Self::decode_peer_list_part(&mut rp).map_err(|_| Error::Message("Truncated message"))?
+                }
+                Self::PART_CLAIMS => claims = Self::decode_claims_part(&mut rp)?,
+                Self::PART_PEER_TIMEOUT => {
+                    peer_timeout =
+                        Some(rp.read_u16::<NetworkEndian>().map_err(|_| Error::Message("Truncated message"))?)
+                }
+                Self::PART_NODEID => {
+                    let mut data = [0; NODE_ID_BYTES];
+                    rp.read_exact(&mut data).map_err(|_| Error::Message("Truncated message"))?;
+                    node_id = Some(data);
+                }
+                Self::PART_ADDRS => {
+                    addrs = Self::read_addr_list(&mut rp).map_err(|_| Error::Message("Truncated message"))?;
+                }
+                _ => {
+                    let mut data = vec![0; part_len];
+                    rp.read_exact(&mut data).map_err(|_| Error::Message("Truncated message"))?;
+                }
+            }
+            r = rp.into_inner();
+        }
+        let node_id = match node_id {
+            Some(node_id) => node_id,
+            None => return Err(Error::Message("Payload without node_id")),
+        };
+        Ok(Self { node_id, peers, claims, peer_timeout, addrs })
+    }
+
+    pub fn decode<R: Read>(r: R) -> Result<Self, Error> {
+        Self::decode_internal(r).map_err(|_| Error::Message("Input data too short"))
+    }
+
+    fn encode_peer_list_part<W: Write>(&self, mut out: W) -> Result<(), io::Error> {
+        for p in &self.peers {
+            let mut addr_ipv4: SmallVec<[SocketAddrV4; 16]> = smallvec![];
+            let mut addr_ipv6: SmallVec<[SocketAddrV6; 16]> = smallvec![];
+            for a in &p.addrs {
+                match a {
+                    SocketAddr::V4(addr) => addr_ipv4.push(*addr),
+                    SocketAddr::V6(addr) => addr_ipv6.push(*addr),
+                }
+            }
+            while addr_ipv4.len() >= 8 {
+                addr_ipv4.pop();
+            }
+            while addr_ipv6.len() >= 8 {
+                addr_ipv6.pop();
+            }
+            let mut flags = addr_ipv6.len() as u8 * 8 + addr_ipv4.len() as u8;
+            if p.node_id.is_some() {
+                flags += 0x80;
+            }
+            out.write_u8(flags)?;
+            if let Some(node_id) = &p.node_id {
+                out.write_all(node_id)?;
+            }
+            for a in addr_ipv6 {
+                out.write_all(&a.ip().octets())?;
+                out.write_u16::<NetworkEndian>(a.port())?;
+            }
+            for a in addr_ipv4 {
+                out.write_all(&a.ip().octets())?;
+                out.write_u16::<NetworkEndian>(a.port())?;
+            }
+        }
+        Ok(())
+    }
+
+    fn encode_addrs_part<W: Write>(&self, mut out: W) -> Result<(), io::Error> {
+        let mut addr_ipv4: SmallVec<[SocketAddrV4; 16]> = smallvec![];
+        let mut addr_ipv6: SmallVec<[SocketAddrV6; 16]> = smallvec![];
+        for a in &self.addrs {
+            match a {
+                SocketAddr::V4(addr) => addr_ipv4.push(*addr),
+                SocketAddr::V6(addr) => addr_ipv6.push(*addr),
+            }
+        }
+        while addr_ipv4.len() >= 8 {
+            addr_ipv4.pop();
+        }
+        while addr_ipv6.len() >= 8 {
+            addr_ipv6.pop();
+        }
+        let flags = addr_ipv6.len() as u8 * 8 + addr_ipv4.len() as u8;
+        out.write_u8(flags)?;
+        for a in addr_ipv6 {
+            out.write_all(&a.ip().octets())?;
+            out.write_u16::<NetworkEndian>(a.port())?;
+        }
+        for a in addr_ipv4 {
+            out.write_all(&a.ip().octets())?;
+            out.write_u16::<NetworkEndian>(a.port())?;
+        }
+        Ok(())
+    }
+
+    fn encode_part<F: FnOnce(&mut Cursor<&mut [u8]>) -> Result<(), io::Error>>(
+        cursor: &mut Cursor<&mut [u8]>, part: u8, f: F,
+    ) -> Result<(), io::Error> {
+        cursor.write_u8(part)?;
+        cursor.write_u16::<NetworkEndian>(0)?;
+        let part_start = cursor.position();
+        f(cursor)?;
+        let part_end = cursor.position();
+        let len = part_end - part_start;
+        cursor.seek(SeekFrom::Start(part_start - 2))?;
+        cursor.write_u16::<NetworkEndian>(len as u16)?;
+        cursor.seek(SeekFrom::Start(part_end))?;
+        Ok(())
+    }
+
+    fn encode_internal(&self, buffer: &mut MsgBuffer) -> Result<(), io::Error> {
+        let len;
+        {
+            let mut cursor = Cursor::new(buffer.buffer());
+            Self::encode_part(&mut cursor, Self::PART_NODEID, |cursor| cursor.write_all(&self.node_id))?;
+            Self::encode_part(&mut cursor, Self::PART_PEERS, |cursor| self.encode_peer_list_part(cursor))?;
+            Self::encode_part(&mut cursor, Self::PART_CLAIMS, |mut cursor| {
+                for c in &self.claims {
+                    c.write_to(&mut cursor);
+                }
+                Ok(())
+            })?;
+            if let Some(timeout) = self.peer_timeout {
+                Self::encode_part(&mut cursor, Self::PART_PEER_TIMEOUT, |cursor| {
+                    cursor.write_u16::<NetworkEndian>(timeout)
+                })?
+            }
+            Self::encode_part(&mut cursor, Self::PART_ADDRS, |cursor| self.encode_addrs_part(cursor))?;
+            cursor.write_u8(Self::PART_END)?;
+            len = cursor.position() as usize;
+        }
+        buffer.set_length(len);
+        Ok(())
+    }
+
+    pub fn encode(&self, buffer: &mut MsgBuffer) {
+        self.encode_internal(buffer).expect("Buffer too small")
+    }
+}
+
+impl Payload for NodeInfo {
+    fn write_to(&self, buffer: &mut MsgBuffer) {
+        self.encode(buffer)
+    }
+
+    fn read_from<R: Read>(r: R) -> Result<Self, Error> {
+        Self::decode(r)
+    }
+}

src/net.rs

@@ -1,53 +1,79 @@
+// VpnCloud - Peer-to-Peer VPN
+// Copyright (C) 2015-2021  Dennis Schwerdel
+// This software is licensed under GPL-3 or newer (see LICENSE.md)
+
 use std::{
     collections::{HashMap, VecDeque},
     io::{self, ErrorKind},
-    net::{SocketAddr, SocketAddrV4, SocketAddrV6, UdpSocket},
+    net::{IpAddr, Ipv6Addr, SocketAddr, UdpSocket},
     os::unix::io::{AsRawFd, RawFd},
-    sync::atomic::{AtomicBool, Ordering}
+    sync::atomic::{AtomicBool, Ordering},
 };
 
-use super::util::{get_internal_ip, MockTimeSource, Time, TimeSource};
+use super::util::{MockTimeSource, MsgBuffer, Time, TimeSource};
+use crate::{config::DEFAULT_PORT, port_forwarding::PortForwarding};
 
-use net2::UdpBuilder;
+pub fn mapped_addr(addr: SocketAddr) -> SocketAddr {
+    // HOT PATH
+    match addr {
+        SocketAddr::V4(addr4) => SocketAddr::new(IpAddr::V6(addr4.ip().to_ipv6_mapped()), addr4.port()),
+        _ => addr,
+    }
+}
 
+pub fn get_ip() -> IpAddr {
+    let s = UdpSocket::bind("0.0.0.0:0").unwrap();
+    s.connect("8.8.8.8:0").unwrap();
+    s.local_addr().unwrap().ip()
+}
 
 pub trait Socket: AsRawFd + Sized {
-    fn listen_v4(host: &str, port: u16) -> Result<Self, io::Error>;
-    fn listen_v6(host: &str, port: u16) -> Result<Self, io::Error>;
-    fn receive(&mut self, buffer: &mut [u8]) -> Result<(usize, SocketAddr), io::Error>;
+    fn listen(addr: &str) -> Result<Self, io::Error>;
+    fn receive(&mut self, buffer: &mut MsgBuffer) -> Result<SocketAddr, io::Error>;
     fn send(&mut self, data: &[u8], addr: SocketAddr) -> Result<usize, io::Error>;
     fn address(&self) -> Result<SocketAddr, io::Error>;
-    fn detect_nat(&self) -> bool;
+    fn create_port_forwarding(&self) -> Option<PortForwarding>;
+}
+
+pub fn parse_listen(addr: &str, default_port: u16) -> SocketAddr {
+    if let Some(addr) = addr.strip_prefix("*:") {
+        let port = try_fail!(addr.parse::<u16>(), "Invalid port: {}");
+        SocketAddr::new(IpAddr::V6(Ipv6Addr::UNSPECIFIED), port)
+    } else if addr.contains(':') {
+        try_fail!(addr.parse::<SocketAddr>(), "Invalid address: {}: {}", addr)
+    } else if let Ok(port) = addr.parse::<u16>() {
+        SocketAddr::new(IpAddr::V6(Ipv6Addr::UNSPECIFIED), port)
+    } else {
+        let ip = try_fail!(addr.parse::<IpAddr>(), "Invalid addr: {}");
+        SocketAddr::new(ip, default_port)
+    }
 }
 
 impl Socket for UdpSocket {
-    fn listen_v4(host: &str, port: u16) -> Result<Self, io::Error> {
-        UdpBuilder::new_v4()
-            .expect("Failed to obtain ipv4 socket builder")
-            .reuse_address(true)
-            .expect("Failed to set so_reuseaddr")
-            .bind((host, port))
+    fn listen(addr: &str) -> Result<Self, io::Error> {
+        let addr = mapped_addr(parse_listen(addr, DEFAULT_PORT));
+        UdpSocket::bind(addr)
     }
-    fn listen_v6(host: &str, port: u16) -> Result<Self, io::Error> {
-        UdpBuilder::new_v6()
-            .expect("Failed to obtain ipv4 socket builder")
-            .only_v6(true)
-            .expect("Failed to set only_v6")
-            .reuse_address(true)
-            .expect("Failed to set so_reuseaddr")
-            .bind((host, port))
-    }
-    fn receive(&mut self, buffer: &mut [u8]) -> Result<(usize, SocketAddr), io::Error> {
-        self.recv_from(buffer)
+
+    fn receive(&mut self, buffer: &mut MsgBuffer) -> Result<SocketAddr, io::Error> {
+        buffer.clear();
+        let (size, addr) = self.recv_from(buffer.buffer())?;
+        buffer.set_length(size);
+        Ok(addr)
     }
+
     fn send(&mut self, data: &[u8], addr: SocketAddr) -> Result<usize, io::Error> {
         self.send_to(data, addr)
     }
+
     fn address(&self) -> Result<SocketAddr, io::Error> {
-        self.local_addr()
+        let mut addr = self.local_addr()?;
+        addr.set_ip(get_ip());
+        Ok(addr)
     }
-    fn detect_nat(&self) -> bool {
-        get_internal_ip().is_private()
+
+    fn create_port_forwarding(&self) -> Option<PortForwarding> {
+        PortForwarding::new(self.address().unwrap().port())
     }
 }
 
@@ -60,7 +86,7 @@ pub struct MockSocket {
     nat_peers: HashMap<SocketAddr, Time>,
     address: SocketAddr,
     outbound: VecDeque<(SocketAddr, Vec<u8>)>,
-    inbound: VecDeque<(SocketAddr, Vec<u8>)>
+    inbound: VecDeque<(SocketAddr, Vec<u8>)>,
 }
 
 impl MockSocket {
@@ -69,8 +95,8 @@ impl MockSocket {
             nat: Self::get_nat(),
             nat_peers: HashMap::new(),
             address,
-            outbound: VecDeque::new(),
-            inbound: VecDeque::new()
+            outbound: VecDeque::with_capacity(10),
+            inbound: VecDeque::with_capacity(10),
         }
     }
 
@@ -85,12 +111,12 @@ impl MockSocket {
     pub fn put_inbound(&mut self, from: SocketAddr, data: Vec<u8>) -> bool {
         if !self.nat {
             self.inbound.push_back((from, data));
-            return true
+            return true;
         }
         if let Some(timeout) = self.nat_peers.get(&from) {
             if *timeout >= MockTimeSource::now() {
                 self.inbound.push_back((from, data));
-                return true
+                return true;
             }
         }
         warn!("Sender {:?} is filtered out by NAT", from);
@@ -109,33 +135,49 @@ impl AsRawFd for MockSocket {
 }
 
 impl Socket for MockSocket {
-    fn listen_v4(host: &str, port: u16) -> Result<Self, io::Error> {
-        let ip = try_fail!(host.parse(), "Failed to parse IPv4 address: {}");
-        Ok(Self::new(SocketAddr::V4(SocketAddrV4::new(ip, port))))
+    fn listen(addr: &str) -> Result<Self, io::Error> {
+        Ok(Self::new(mapped_addr(parse_listen(addr, DEFAULT_PORT))))
     }
-    fn listen_v6(host: &str, port: u16) -> Result<Self, io::Error> {
-        let ip = try_fail!(host.parse(), "Failed to parse IPv6 address: {}");
-        Ok(Self::new(SocketAddr::V6(SocketAddrV6::new(ip, port, 0, 0))))
-    }
-    fn receive(&mut self, buffer: &mut [u8]) -> Result<(usize, SocketAddr), io::Error> {
+
+    fn receive(&mut self, buffer: &mut MsgBuffer) -> Result<SocketAddr, io::Error> {
         if let Some((addr, data)) = self.inbound.pop_front() {
-            buffer[0..data.len()].copy_from_slice(&data);
-            Ok((data.len(), addr))
+            buffer.clear();
+            buffer.set_length(data.len());
+            buffer.message_mut().copy_from_slice(&data);
+            Ok(addr)
         } else {
             Err(io::Error::new(ErrorKind::Other, "nothing in queue"))
         }
     }
+
     fn send(&mut self, data: &[u8], addr: SocketAddr) -> Result<usize, io::Error> {
-        self.outbound.push_back((addr, data.to_owned()));
+        self.outbound.push_back((addr, data.into()));
         if self.nat {
             self.nat_peers.insert(addr, MockTimeSource::now() + 300);
         }
         Ok(data.len())
     }
+
     fn address(&self) -> Result<SocketAddr, io::Error> {
         Ok(self.address)
     }
-    fn detect_nat(&self) -> bool {
-        self.nat
+
+    fn create_port_forwarding(&self) -> Option<PortForwarding> {
+        None
+    }
+}
+
+#[cfg(feature = "bench")]
+mod bench {
+    use std::net::{Ipv4Addr, SocketAddrV4, UdpSocket};
+    use test::Bencher;
+
+    #[bench]
+    fn udp_send(b: &mut Bencher) {
+        let sock = UdpSocket::bind("127.0.0.1:0").unwrap();
+        let data = [0; 1400];
+        let addr = SocketAddrV4::new(Ipv4Addr::new(127, 0, 0, 1), 1);
+        b.iter(|| sock.send_to(&data, &addr).unwrap());
+        b.bytes = 1400;
     }
 }

src/oldconfig.rs

@@ -0,0 +1,128 @@
+// VpnCloud - Peer-to-Peer VPN
+// Copyright (C) 2015-2021  Dennis Schwerdel
+// This software is licensed under GPL-3 or newer (see LICENSE.md)
+
+use super::{device::Type, types::Mode, util::Duration};
+use crate::config::{ConfigFile, ConfigFileBeacon, ConfigFileDevice, ConfigFileStatsd, CryptoConfig};
+use std::collections::HashMap;
+
+#[derive(Serialize, Deserialize, Debug, PartialEq, Clone, Copy)]
+pub enum OldCryptoMethod {
+    #[serde(rename = "chacha20")]
+    ChaCha20,
+    #[serde(rename = "aes256")]
+    AES256,
+    #[serde(rename = "aes128")]
+    AES128,
+}
+
+#[derive(Serialize, Deserialize, Debug, PartialEq, Default)]
+pub struct OldConfigFile {
+    #[serde(alias = "device-type")]
+    pub device_type: Option<Type>,
+    #[serde(alias = "device-name")]
+    pub device_name: Option<String>,
+    #[serde(alias = "device-path")]
+    pub device_path: Option<String>,
+    pub ifup: Option<String>,
+    pub ifdown: Option<String>,
+    pub crypto: Option<OldCryptoMethod>,
+    #[serde(alias = "shared-key")]
+    pub shared_key: Option<String>,
+    pub magic: Option<String>,
+    pub port: Option<u16>,
+    pub listen: Option<String>,
+    pub peers: Option<Vec<String>>,
+    #[serde(alias = "peer-timeout")]
+    pub peer_timeout: Option<Duration>,
+    pub keepalive: Option<Duration>,
+    #[serde(alias = "beacon-store")]
+    pub beacon_store: Option<String>,
+    #[serde(alias = "beacon-load")]
+    pub beacon_load: Option<String>,
+    #[serde(alias = "beacon-interval")]
+    pub beacon_interval: Option<Duration>,
+    pub mode: Option<Mode>,
+    #[serde(alias = "dst-timeout")]
+    pub dst_timeout: Option<Duration>,
+    pub subnets: Option<Vec<String>>,
+    #[serde(alias = "port-forwarding")]
+    pub port_forwarding: Option<bool>,
+    #[serde(alias = "pid-file")]
+    pub pid_file: Option<String>,
+    #[serde(alias = "stats-file")]
+    pub stats_file: Option<String>,
+    #[serde(alias = "statsd-server")]
+    pub statsd_server: Option<String>,
+    #[serde(alias = "statsd-prefix")]
+    pub statsd_prefix: Option<String>,
+    pub user: Option<String>,
+    pub group: Option<String>,
+}
+
+impl OldConfigFile {
+    #[allow(clippy::or_fun_call)]
+    pub fn convert(self) -> ConfigFile {
+        if self.device_type.is_none() {
+            warn!("The default device type changed from TAP to TUN")
+        }
+        if self.ifup.is_some() {
+            info!("There is a new option --ip that can handle most use cases of --ifup")
+        }
+        info!("The converted config enables all available encryption algorithms");
+        if self.shared_key.is_none() {
+            warn!("Operation without a password is no longer supported, password set to 'none'");
+        }
+        if self.magic.is_some() {
+            warn!("The magic header functionality is no longer supported")
+        }
+        if self.listen.is_some() && self.port.is_some() {
+            warn!("The port option is no longer available, using listen instead")
+        }
+        if self.peer_timeout.is_none() {
+            info!("The default peer timeout changed from 10 minutes to 5 minutes")
+        }
+        warn!("Even with a converted config file version 2 nodes can not communicate with version 1 nodes");
+        ConfigFile {
+            auto_claim: None,
+            beacon: Some(ConfigFileBeacon {
+                interval: self.beacon_interval,
+                load: self.beacon_load,
+                store: self.beacon_store,
+                password: self.shared_key.clone(),
+            }),
+            claims: self.subnets,
+            crypto: CryptoConfig {
+                algorithms: vec![],
+                password: Some(self.shared_key.unwrap_or_else(|| "none".to_string())),
+                private_key: None,
+                public_key: None,
+                trusted_keys: vec![],
+            },
+            device: Some(ConfigFileDevice {
+                fix_rp_filter: None,
+                name: self.device_name,
+                path: self.device_path,
+                type_: self.device_type,
+            }),
+            group: self.group,
+            ifdown: self.ifdown,
+            ifup: self.ifup,
+            ip: None,
+            advertise_addresses: None,
+            keepalive: self.keepalive,
+            listen: self.listen.or(self.port.map(|p| format!("{}", p))),
+            mode: self.mode,
+            peer_timeout: self.peer_timeout,
+            peers: self.peers,
+            pid_file: self.pid_file,
+            port_forwarding: self.port_forwarding,
+            stats_file: self.stats_file,
+            statsd: Some(ConfigFileStatsd { prefix: self.statsd_prefix, server: self.statsd_server }),
+            switch_timeout: self.dst_timeout,
+            user: self.user,
+            hook: None,
+            hooks: HashMap::new(),
+        }
+    }
+}

src/payload.rs

@@ -0,0 +1,159 @@
+// VpnCloud - Peer-to-Peer VPN
+// Copyright (C) 2015-2021  Dennis Schwerdel
+// This software is licensed under GPL-3 or newer (see LICENSE.md)
+
+use crate::{error::Error, types::Address};
+use std::io::{Cursor, Read};
+
+pub trait Protocol: Sized {
+    fn parse(_: &[u8]) -> Result<(Address, Address), Error>;
+}
+
+/// An ethernet frame dissector
+///
+/// This dissector is able to extract the source and destination addresses of ethernet frames.
+///
+/// If the ethernet frame contains a VLAN tag, both addresses will be prefixed with that tag,
+/// resulting in 8-byte addresses. Additional nested tags will be ignored.
+pub struct Frame;
+
+impl Protocol for Frame {
+    /// Parses an ethernet frame and extracts the source and destination addresses
+    ///
+    /// # Errors
+    /// This method will fail when the given data is not a valid ethernet frame.
+    fn parse(data: &[u8]) -> Result<(Address, Address), Error> {
+        // HOT PATH
+        let mut cursor = Cursor::new(data);
+        let mut src = [0; 16];
+        let mut dst = [0; 16];
+        let mut proto = [0; 2];
+        cursor
+            .read_exact(&mut dst[..6])
+            .and_then(|_| cursor.read_exact(&mut src[..6]))
+            .and_then(|_| cursor.read_exact(&mut proto))
+            .map_err(|_| Error::Parse("Frame is too short"))?;
+        if proto == [0x81, 0x00] {
+            src.copy_within(..6, 2);
+            dst.copy_within(..6, 2);
+            cursor.read_exact(&mut src[..2]).map_err(|_| Error::Parse("Vlan frame is too short"))?;
+            src[0] &= 0x0f; // restrict vlan id to 12 bits
+            dst[..2].copy_from_slice(&src[..2]);
+            if src[0..1] == [0, 0] {
+                // treat vlan id 0x000 as untagged
+                src.copy_within(2..8, 0);
+                dst.copy_within(2..8, 0);
+                return Ok((Address { data: src, len: 6 }, Address { data: dst, len: 6 }));
+            }
+            Ok((Address { data: src, len: 8 }, Address { data: dst, len: 8 }))
+        } else {
+            Ok((Address { data: src, len: 6 }, Address { data: dst, len: 6 }))
+        }
+    }
+}
+
+#[test]
+fn decode_frame_without_vlan() {
+    let data = [6, 5, 4, 3, 2, 1, 1, 2, 3, 4, 5, 6, 1, 2, 3, 4, 5, 6, 7, 8];
+    let (src, dst) = Frame::parse(&data).unwrap();
+    assert_eq!(src, Address { data: [1, 2, 3, 4, 5, 6, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0], len: 6 });
+    assert_eq!(dst, Address { data: [6, 5, 4, 3, 2, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0], len: 6 });
+}
+
+#[test]
+fn decode_frame_with_vlan() {
+    let data = [6, 5, 4, 3, 2, 1, 1, 2, 3, 4, 5, 6, 0x81, 0, 4, 210, 1, 2, 3, 4, 5, 6, 7, 8];
+    let (src, dst) = Frame::parse(&data).unwrap();
+    assert_eq!(src, Address { data: [4, 210, 1, 2, 3, 4, 5, 6, 0, 0, 0, 0, 0, 0, 0, 0], len: 8 });
+    assert_eq!(dst, Address { data: [4, 210, 6, 5, 4, 3, 2, 1, 0, 0, 0, 0, 0, 0, 0, 0], len: 8 });
+}
+
+#[test]
+fn decode_invalid_frame() {
+    assert!(Frame::parse(&[6, 5, 4, 3, 2, 1, 1, 2, 3, 4, 5, 6, 1, 2, 3, 4, 5, 6, 7, 8]).is_ok());
+    // truncated frame
+    assert!(Frame::parse(&[]).is_err());
+    // truncated vlan frame
+    assert!(Frame::parse(&[6, 5, 4, 3, 2, 1, 1, 2, 3, 4, 5, 6, 0x81, 0x00]).is_err());
+}
+
+/// An IP packet dissector
+///
+/// This dissector is able to extract the source and destination ip addresses of ipv4 packets and
+/// ipv6 packets.
+#[allow(dead_code)]
+pub struct Packet;
+
+impl Protocol for Packet {
+    /// Parses an ip packet and extracts the source and destination addresses
+    ///
+    /// # Errors
+    /// This method will fail when the given data is not a valid ipv4 and ipv6 packet.
+    fn parse(data: &[u8]) -> Result<(Address, Address), Error> {
+        // HOT PATH
+        if data.is_empty() {
+            return Err(Error::Parse("Empty header"));
+        }
+        let version = data[0] >> 4;
+        match version {
+            4 => {
+                if data.len() < 20 {
+                    return Err(Error::Parse("Truncated IPv4 header"));
+                }
+                let src = Address::read_from_fixed(&data[12..], 4)?;
+                let dst = Address::read_from_fixed(&data[16..], 4)?;
+                Ok((src, dst))
+            }
+            6 => {
+                if data.len() < 40 {
+                    return Err(Error::Parse("Truncated IPv6 header"));
+                }
+                let src = Address::read_from_fixed(&data[8..], 16)?;
+                let dst = Address::read_from_fixed(&data[24..], 16)?;
+                Ok((src, dst))
+            }
+            _ => Err(Error::Parse("Invalid IP protocol version")),
+        }
+    }
+}
+
+#[test]
+fn decode_ipv4_packet() {
+    let data = [0x40, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 192, 168, 1, 1, 192, 168, 1, 2];
+    let (src, dst) = Packet::parse(&data).unwrap();
+    assert_eq!(src, Address { data: [192, 168, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0], len: 4 });
+    assert_eq!(dst, Address { data: [192, 168, 1, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0], len: 4 });
+}
+
+#[test]
+fn decode_ipv6_packet() {
+    let data = [
+        0x60, 0, 0, 0, 0, 0, 0, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 0, 1, 2, 3, 4, 5, 6, 0, 9, 8, 7, 6, 5, 4, 3, 2, 1, 6, 5,
+        4, 3, 2, 1,
+    ];
+    let (src, dst) = Packet::parse(&data).unwrap();
+    assert_eq!(src, Address { data: [1, 2, 3, 4, 5, 6, 7, 8, 9, 0, 1, 2, 3, 4, 5, 6], len: 16 });
+    assert_eq!(dst, Address { data: [0, 9, 8, 7, 6, 5, 4, 3, 2, 1, 6, 5, 4, 3, 2, 1], len: 16 });
+}
+
+#[test]
+fn decode_invalid_packet() {
+    assert!(Packet::parse(&[0x40, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 192, 168, 1, 1, 192, 168, 1, 2]).is_ok());
+    assert!(Packet::parse(&[
+        0x60, 0, 0, 0, 0, 0, 0, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 0, 1, 2, 3, 4, 5, 6, 0, 9, 8, 7, 6, 5, 4, 3, 2, 1, 6, 5,
+        4, 3, 2, 1
+    ])
+    .is_ok());
+    // no data
+    assert!(Packet::parse(&[]).is_err());
+    // wrong version
+    assert!(Packet::parse(&[0x20]).is_err());
+    // truncated ipv4
+    assert!(Packet::parse(&[0x40, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 192, 168, 1, 1, 192, 168, 1]).is_err());
+    // truncated ipv6
+    assert!(Packet::parse(&[
+        0x60, 0, 0, 0, 0, 0, 0, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 0, 1, 2, 3, 4, 5, 6, 0, 9, 8, 7, 6, 5, 4, 3, 2, 1, 6, 5,
+        4, 3, 2
+    ])
+    .is_err());
+}

src/poll/epoll.rs

@@ -1,62 +1,43 @@
 // VpnCloud - Peer-to-Peer VPN
-// Copyright (C) 2015-2019  Dennis Schwerdel
+// Copyright (C) 2015-2021  Dennis Schwerdel
 // This software is licensed under GPL-3 or newer (see LICENSE.md)
 
-use libc;
-
-use crate::device::Device;
 use std::{io, os::unix::io::RawFd};
 
 use super::WaitResult;
-use crate::{device::Type, net::Socket};
 
 pub struct EpollWait {
     poll_fd: RawFd,
     event: libc::epoll_event,
-    socketv4: RawFd,
-    socketv6: RawFd,
+    socket: RawFd,
     device: RawFd,
-    timeout: u32
+    timeout: u32,
 }
 
 impl EpollWait {
-    pub fn new<S: Socket>(socketv4: &S, socketv6: &S, device: &dyn Device, timeout: u32) -> io::Result<Self> {
-        Self::create(socketv4, socketv6, device, timeout, libc::EPOLLIN as u32)
+    pub fn new(socket: RawFd, device: RawFd, timeout: u32) -> io::Result<Self> {
+        Self::create(socket, device, timeout, libc::EPOLLIN as u32)
     }
 
-    pub fn testing<S: Socket>(socketv4: &S, socketv6: &S, device: &dyn Device, timeout: u32) -> io::Result<Self> {
-        Self::create(socketv4, socketv6, device, timeout, (libc::EPOLLIN | libc::EPOLLOUT) as u32)
+    pub fn testing(socket: RawFd, device: RawFd, timeout: u32) -> io::Result<Self> {
+        Self::create(socket, device, timeout, (libc::EPOLLIN | libc::EPOLLOUT) as u32)
     }
 
-    fn create<S: Socket>(
-        socketv4: &S, socketv6: &S, device: &dyn Device, timeout: u32, flags: u32
-    ) -> io::Result<Self> {
+    fn create(socket: RawFd, device: RawFd, timeout: u32, flags: u32) -> io::Result<Self> {
         let mut event = libc::epoll_event { u64: 0, events: 0 };
         let poll_fd = unsafe { libc::epoll_create(3) };
         if poll_fd == -1 {
-            return Err(io::Error::last_os_error())
+            return Err(io::Error::last_os_error());
         }
-        let raw_fds = if device.get_type() != Type::Dummy {
-            vec![socketv4.as_raw_fd(), socketv6.as_raw_fd(), device.as_raw_fd()]
-        } else {
-            vec![socketv4.as_raw_fd(), socketv6.as_raw_fd()]
-        };
-        for fd in raw_fds {
-            event.u64 = fd as u64;
+        for fd in &[socket, device] {
+            event.u64 = *fd as u64;
             event.events = flags;
-            let res = unsafe { libc::epoll_ctl(poll_fd, libc::EPOLL_CTL_ADD, fd, &mut event) };
+            let res = unsafe { libc::epoll_ctl(poll_fd, libc::EPOLL_CTL_ADD, *fd, &mut event) };
             if res == -1 {
-                return Err(io::Error::last_os_error())
+                return Err(io::Error::last_os_error());
             }
         }
-        Ok(Self {
-            poll_fd,
-            event,
-            socketv4: socketv4.as_raw_fd(),
-            socketv6: socketv6.as_raw_fd(),
-            device: device.as_raw_fd(),
-            timeout
-        })
+        Ok(Self { poll_fd, event, socket, device, timeout })
     }
 }
 
@@ -74,17 +55,15 @@ impl Iterator for EpollWait {
             -1 => WaitResult::Error(io::Error::last_os_error()),
             0 => WaitResult::Timeout,
             1 => {
-                if self.event.u64 == self.socketv4 as u64 {
-                    WaitResult::SocketV4
-                } else if self.event.u64 == self.socketv6 as u64 {
-                    WaitResult::SocketV6
+                if self.event.u64 == self.socket as u64 {
+                    WaitResult::Socket
                 } else if self.event.u64 == self.device as u64 {
                     WaitResult::Device
                 } else {
                     unreachable!()
                 }
             }
-            _ => unreachable!()
+            _ => unreachable!(),
         })
     }
 }

src/poll/mod.rs

@@ -1,5 +1,5 @@
 // VpnCloud - Peer-to-Peer VPN
-// Copyright (C) 2015-2019  Dennis Schwerdel
+// Copyright (C) 2015-2021  Dennis Schwerdel
 // This software is licensed under GPL-3 or newer (see LICENSE.md)
 
 #[cfg(any(target_os = "linux", target_os = "android"))]
@@ -8,13 +8,11 @@ mod epoll;
 #[cfg(any(target_os = "linux", target_os = "android"))]
 pub use self::epoll::EpollWait as WaitImpl;
 
-
 use std::io;
 
 pub enum WaitResult {
     Timeout,
-    SocketV4,
-    SocketV6,
+    Socket,
     Device,
-    Error(io::Error)
+    Error(io::Error),
 }

src/port_forwarding.rs

@@ -1,132 +1,185 @@
 // VpnCloud - Peer-to-Peer VPN
-// Copyright (C) 2015-2019  Dennis Schwerdel
+// Copyright (C) 2015-2021  Dennis Schwerdel
 // This software is licensed under GPL-3 or newer (see LICENSE.md)
 
-use std::{io, net::SocketAddrV4};
+#[cfg(feature = "nat")]
+mod internal {
 
-use igd::*;
+    use std::{io, net::SocketAddrV4};
 
-use super::util::{get_internal_ip, SystemTimeSource, Time, TimeSource};
+    use igd::{search_gateway, AddAnyPortError, AddPortError, Gateway, PortMappingProtocol, SearchError};
 
-const LEASE_TIME: u32 = 1800;
-const DESCRIPTION: &str = "VpnCloud";
+    use crate::util::{get_internal_ip, SystemTimeSource, Time, TimeSource};
 
+    const LEASE_TIME: u32 = 1800;
 
-pub struct PortForwarding {
-    pub internal_addr: SocketAddrV4,
-    pub external_addr: SocketAddrV4,
-    pub gateway: Gateway,
-    pub next_extension: Option<Time>
-}
+    const DESCRIPTION: &str = "VpnCloud";
 
-impl PortForwarding {
-    pub fn new(port: u16) -> Option<Self> {
-        // Get the gateway
-        let gateway = match search_gateway(Default::default()) {
-            Ok(gateway) => gateway,
-            Err(err) => {
-                if let SearchError::IoError(ref err) = err {
-                    if err.kind() == io::ErrorKind::WouldBlock {
-                        // Why this code?
-                        warn!("Port-forwarding: no router found");
-                        return None
+    pub struct PortForwarding {
+        pub internal_addr: SocketAddrV4,
+        pub external_addr: SocketAddrV4,
+        gateway: Gateway,
+        pub next_extension: Option<Time>,
+    }
+
+    impl PortForwarding {
+        pub fn new(port: u16) -> Option<Self> {
+            // Get the gateway
+            let gateway = match search_gateway(Default::default()) {
+                Ok(gateway) => gateway,
+                Err(err) => {
+                    if let SearchError::IoError(ref err) = err {
+                        if err.kind() == io::ErrorKind::WouldBlock {
+                            // Why this code?
+                            info!("Port-forwarding: no router found");
+                            return None;
+                        }
                     }
+                    error!("Port-forwarding: failed to find router: {}", err);
+                    return None;
                 }
-                error!("Port-forwarding: failed to find router: {}", err);
-                return None
+            };
+            debug!("Port-forwarding: found router at {}", gateway.addr);
+            let internal_addr = SocketAddrV4::new(get_internal_ip(), port);
+            // Query the external address
+            let external_ip = match gateway.get_external_ip() {
+                Ok(ip) => ip,
+                Err(err) => {
+                    error!("Port-forwarding: failed to obtain external IP: {}", err);
+                    return None;
+                }
+            };
+            if let Ok((port, timeout)) = Self::get_any_forwarding(&gateway, internal_addr, port) {
+                debug!("Port-forwarding: external IP is {}", external_ip);
+                let external_addr = SocketAddrV4::new(external_ip, port);
+                debug!("Port-forwarding has timeout {}", timeout);
+                info!("Port-forwarding: successfully activated port forward on {}", external_addr);
+                let next_extension =
+                    if timeout > 0 { Some(SystemTimeSource::now() + Time::from(timeout) - 60) } else { None };
+                Some(PortForwarding { internal_addr, external_addr, gateway, next_extension })
+            } else {
+                None
             }
-        };
-        info!("Port-forwarding: found router at {}", gateway.addr);
-        let internal_addr = SocketAddrV4::new(get_internal_ip(), port);
-        // Query the external address
-        let external_ip = match gateway.get_external_ip() {
-            Ok(ip) => ip,
-            Err(err) => {
-                error!("Port-forwarding: failed to obtain external IP: {}", err);
-                return None
+        }
+
+        fn get_any_forwarding(gateway: &Gateway, addr: SocketAddrV4, port: u16) -> Result<(u16, u32), ()> {
+            if let Ok(a) = Self::get_forwarding(gateway, addr, port) {
+                return Ok(a);
             }
-        };
-        // Try to activate the port forwarding
-        // - First with external port = internal port and timeout
-        // - If the port is used, request any port
-        // - If timeout is denied, try permanent forwarding
-        info!("Port-forwarding: external IP is {}", external_ip);
-        let (external_addr, timeout) = match gateway.add_port(
-            PortMappingProtocol::UDP,
-            internal_addr.port(),
-            internal_addr,
-            LEASE_TIME,
-            DESCRIPTION
-        ) {
-            Ok(()) => (SocketAddrV4::new(external_ip, internal_addr.port()), LEASE_TIME),
-            Err(AddPortError::PortInUse) => {
-                match gateway.add_any_port(PortMappingProtocol::UDP, internal_addr, LEASE_TIME, DESCRIPTION) {
-                    Ok(port) => (SocketAddrV4::new(external_ip, port), LEASE_TIME),
+            if let Ok(a) = Self::get_forwarding(gateway, addr, 0) {
+                return Ok(a);
+            }
+            for i in 1..5 {
+                if let Ok(a) = Self::get_forwarding(gateway, addr, port + i) {
+                    return Ok(a);
+                }
+            }
+            for _ in 0..5 {
+                if let Ok(a) = Self::get_forwarding(gateway, addr, rand::random()) {
+                    return Ok(a);
+                }
+            }
+            warn!("Failed to activate port forwarding");
+            Err(())
+        }
+
+        fn get_forwarding(gateway: &Gateway, addr: SocketAddrV4, port: u16) -> Result<(u16, u32), ()> {
+            debug!("Trying external port {}", port);
+            if port == 0 {
+                match gateway.add_any_port(PortMappingProtocol::UDP, addr, LEASE_TIME, DESCRIPTION) {
+                    Ok(port) => Ok((port, LEASE_TIME)),
                     Err(AddAnyPortError::OnlyPermanentLeasesSupported) => {
-                        match gateway.add_any_port(PortMappingProtocol::UDP, internal_addr, 0, DESCRIPTION) {
-                            Ok(port) => (SocketAddrV4::new(external_ip, port), 0),
+                        match gateway.add_any_port(PortMappingProtocol::UDP, addr, 0, DESCRIPTION) {
+                            Ok(port) => Ok((port, 0)),
                             Err(err) => {
-                                error!("Port-forwarding: failed to activate port forwarding: {}", err);
-                                return None
+                                debug!("Port-forwarding: failed to activate port forwarding: {}", err);
+                                Err(())
                             }
                         }
                     }
                     Err(err) => {
-                        error!("Port-forwarding: failed to activate port forwarding: {}", err);
-                        return None
+                        debug!("Port-forwarding: failed to activate port forwarding: {}", err);
+                        Err(())
                     }
                 }
-            }
-            Err(AddPortError::OnlyPermanentLeasesSupported) => {
-                match gateway.add_port(PortMappingProtocol::UDP, internal_addr.port(), internal_addr, 0, DESCRIPTION) {
-                    Ok(()) => (SocketAddrV4::new(external_ip, internal_addr.port()), 0),
+            } else {
+                match gateway.add_port(PortMappingProtocol::UDP, port, addr, LEASE_TIME, DESCRIPTION) {
+                    Ok(()) => Ok((port, LEASE_TIME)),
+                    Err(AddPortError::OnlyPermanentLeasesSupported) => {
+                        match gateway.add_port(PortMappingProtocol::UDP, port, addr, 0, DESCRIPTION) {
+                            Ok(()) => Ok((port, 0)),
+                            Err(err) => {
+                                debug!("Port-forwarding: failed to activate port forwarding: {}", err);
+                                Err(())
+                            }
+                        }
+                    }
                     Err(err) => {
-                        error!("Port-forwarding: failed to activate port forwarding: {}", err);
-                        return None
+                        debug!("Port-forwarding: failed to activate port forwarding: {}", err);
+                        Err(())
                     }
                 }
             }
-            Err(err) => {
-                error!("Port-forwarding: failed to activate port forwarding: {}", err);
-                return None
-            }
-        };
-        info!("Port-forwarding: sucessfully activated port forward on {}, timeout: {}", external_addr, timeout);
-        let next_extension = if timeout > 0 { Some(SystemTimeSource::now() + Time::from(timeout) - 60) } else { None };
-        Some(PortForwarding { internal_addr, external_addr, gateway, next_extension })
-    }
-
-    pub fn check_extend(&mut self) {
-        if let Some(deadline) = self.next_extension {
-            if deadline > SystemTimeSource::now() {
-                return
-            }
-        } else {
-            return
         }
-        match self.gateway.add_port(
-            PortMappingProtocol::UDP,
-            self.external_addr.port(),
-            self.internal_addr,
-            LEASE_TIME,
-            DESCRIPTION
-        ) {
-            Ok(()) => debug!("Port-forwarding: extended port forwarding"),
-            Err(err) => error!("Port-forwarding: failed to extend port forwarding: {}", err)
-        };
-        self.next_extension = Some(SystemTimeSource::now() + Time::from(LEASE_TIME) - 60);
+
+        pub fn check_extend(&mut self) {
+            if let Some(deadline) = self.next_extension {
+                if deadline > SystemTimeSource::now() {
+                    return;
+                }
+            } else {
+                return;
+            }
+            match self.gateway.add_port(
+                PortMappingProtocol::UDP,
+                self.external_addr.port(),
+                self.internal_addr,
+                LEASE_TIME,
+                DESCRIPTION,
+            ) {
+                Ok(()) => debug!("Port-forwarding: extended port forwarding"),
+                Err(err) => debug!("Port-forwarding: failed to extend port forwarding: {}", err),
+            };
+            self.next_extension = Some(SystemTimeSource::now() + Time::from(LEASE_TIME) - 60);
+        }
+
+        fn deactivate(&self) {
+            match self.gateway.remove_port(PortMappingProtocol::UDP, self.external_addr.port()) {
+                Ok(()) => info!("Port-forwarding: successfully deactivated port forwarding"),
+                Err(err) => debug!("Port-forwarding: failed to deactivate port forwarding: {}", err),
+            }
+        }
+
+        pub fn get_internal_ip(&self) -> SocketAddrV4 {
+            self.internal_addr
+        }
+
+        pub fn get_external_ip(&self) -> SocketAddrV4 {
+            self.external_addr
+        }
     }
 
-    fn deactivate(&self) {
-        match self.gateway.remove_port(PortMappingProtocol::UDP, self.external_addr.port()) {
-            Ok(()) => info!("Port-forwarding: successfully deactivated port forwarding"),
-            Err(err) => error!("Port-forwarding: failed to deactivate port forwarding: {}", err)
+    impl Drop for PortForwarding {
+        fn drop(&mut self) {
+            self.deactivate()
         }
     }
 }
 
-impl Drop for PortForwarding {
-    fn drop(&mut self) {
-        self.deactivate()
+#[cfg(not(feature = "nat"))]
+mod internal {
+    pub struct PortForwarding;
+
+    impl PortForwarding {
+        pub fn new(_port: u16) -> Option<Self> {
+            warn!("Compiled without feature 'nat', skipping port forwarding.");
+            None
+        }
+
+        pub fn check_extend(&mut self) {
+            unreachable!()
+        }
     }
 }
+
+pub use internal::*;

src/table.rs

@@ -0,0 +1,160 @@
+// VpnCloud - Peer-to-Peer VPN
+// Copyright (C) 2015-2021  Dennis Schwerdel
+// This software is licensed under GPL-3 or newer (see LICENSE.md)
+
+use fnv::FnvHasher;
+use std::{
+    cmp::min, collections::HashMap, hash::BuildHasherDefault, io, io::Write, marker::PhantomData, net::SocketAddr,
+};
+
+use crate::{
+    types::{Address, Range, RangeList},
+    util::{addr_nice, Duration, Time, TimeSource},
+};
+
+type Hash = BuildHasherDefault<FnvHasher>;
+
+struct CacheValue {
+    peer: SocketAddr,
+    timeout: Time,
+}
+
+struct ClaimEntry {
+    peer: SocketAddr,
+    claim: Range,
+    timeout: Time,
+}
+
+pub struct ClaimTable<TS: TimeSource> {
+    cache: HashMap<Address, CacheValue, Hash>,
+    cache_timeout: Duration,
+    claims: Vec<ClaimEntry>,
+    claim_timeout: Duration,
+    _dummy: PhantomData<TS>,
+}
+
+impl<TS: TimeSource> ClaimTable<TS> {
+    pub fn new(cache_timeout: Duration, claim_timeout: Duration) -> Self {
+        Self { cache: HashMap::default(), cache_timeout, claims: vec![], claim_timeout, _dummy: PhantomData }
+    }
+
+    pub fn cache(&mut self, addr: Address, peer: SocketAddr) {
+        // HOT PATH
+        self.cache.insert(addr, CacheValue { peer, timeout: TS::now() + self.cache_timeout as Time });
+    }
+
+    pub fn clear_cache(&mut self) {
+        self.cache.clear()
+    }
+
+    pub fn set_claims(&mut self, peer: SocketAddr, mut claims: RangeList) {
+        let mut removed_claim = false;
+        for entry in &mut self.claims {
+            if entry.peer == peer {
+                let pos = claims.iter().position(|r| r == &entry.claim);
+                if let Some(pos) = pos {
+                    entry.timeout = TS::now() + self.claim_timeout as Time;
+                    claims.swap_remove(pos);
+                    if claims.is_empty() {
+                        break;
+                    }
+                } else {
+                    entry.timeout = 0;
+                    removed_claim = true;
+                }
+            }
+        }
+        for claim in claims {
+            self.claims.push(ClaimEntry { peer, claim, timeout: TS::now() + self.claim_timeout as Time })
+        }
+        if removed_claim {
+            for entry in self.cache.values_mut() {
+                if entry.peer == peer {
+                    entry.timeout = 0
+                }
+            }
+        }
+        self.housekeep()
+    }
+
+    pub fn remove_claims(&mut self, peer: SocketAddr) {
+        for entry in &mut self.claims {
+            if entry.peer == peer {
+                entry.timeout = 0
+            }
+        }
+        for entry in self.cache.values_mut() {
+            if entry.peer == peer {
+                entry.timeout = 0
+            }
+        }
+        self.housekeep()
+    }
+
+    pub fn lookup(&mut self, addr: Address) -> Option<SocketAddr> {
+        // HOT PATH
+        if let Some(entry) = self.cache.get(&addr) {
+            return Some(entry.peer);
+        }
+        // COLD PATH
+        let mut found = None;
+        let mut prefix_len = -1;
+        for entry in &self.claims {
+            if entry.claim.prefix_len as isize > prefix_len && entry.claim.matches(addr) {
+                found = Some(entry);
+                prefix_len = entry.claim.prefix_len as isize;
+            }
+        }
+        if let Some(entry) = found {
+            self.cache.insert(
+                addr,
+                CacheValue { peer: entry.peer, timeout: min(TS::now() + self.cache_timeout as Time, entry.timeout) },
+            );
+            return Some(entry.peer);
+        }
+        None
+    }
+
+    pub fn housekeep(&mut self) {
+        let now = TS::now();
+        self.cache.retain(|_, v| v.timeout >= now);
+        self.claims.retain(|e| e.timeout >= now);
+    }
+
+    pub fn cache_len(&self) -> usize {
+        self.cache.len()
+    }
+
+    pub fn claim_len(&self) -> usize {
+        self.claims.len()
+    }
+
+    /// Write out the table
+    pub fn write_out<W: Write>(&self, out: &mut W) -> Result<(), io::Error> {
+        let now = TS::now();
+        writeln!(out, "forwarding_table:")?;
+        writeln!(out, "  claims:")?;
+        for entry in &self.claims {
+            writeln!(
+                out,
+                "    - \"{}\": {{ peer: \"{}\", timeout: {} }}",
+                entry.claim,
+                addr_nice(entry.peer),
+                entry.timeout - now
+            )?;
+        }
+        writeln!(out, "  cache:")?;
+        for (addr, entry) in &self.cache {
+            writeln!(
+                out,
+                "    - \"{}\": {{ peer: \"{}\", timeout: {} }}",
+                addr,
+                addr_nice(entry.peer),
+                entry.timeout - now
+            )?;
+        }
+        Ok(())
+    }
+}
+
+// TODO: test

src/tests/common.rs

@@ -0,0 +1,210 @@
+// VpnCloud - Peer-to-Peer VPN
+// Copyright (C) 2015-2021  Dennis Schwerdel
+// This software is licensed under GPL-3 or newer (see LICENSE.md)
+
+use std::{
+    collections::{HashMap, VecDeque},
+    io::Write,
+    net::SocketAddr,
+    sync::{
+        atomic::{AtomicUsize, Ordering},
+        Once,
+    },
+};
+
+pub use crate::{
+    cloud::GenericCloud,
+    config::{Config, CryptoConfig},
+    device::{MockDevice, Type},
+    net::MockSocket,
+    payload::{Frame, Packet, Protocol},
+    util::{MockTimeSource, Time, TimeSource},
+};
+
+static INIT_LOGGER: Once = Once::new();
+
+pub fn init_debug_logger() {
+    INIT_LOGGER.call_once(|| {
+        log::set_boxed_logger(Box::new(DebugLogger)).unwrap();
+        log::set_max_level(log::LevelFilter::Debug);
+    })
+}
+
+static CURRENT_NODE: AtomicUsize = AtomicUsize::new(0);
+
+struct DebugLogger;
+
+impl DebugLogger {
+    pub fn set_node(node: usize) {
+        CURRENT_NODE.store(node, Ordering::SeqCst);
+    }
+}
+
+impl log::Log for DebugLogger {
+    #[inline]
+    fn enabled(&self, metadata: &log::Metadata) -> bool {
+        log::max_level() > metadata.level()
+    }
+
+    #[inline]
+    fn log(&self, record: &log::Record) {
+        if self.enabled(record.metadata()) {
+            eprintln!("Node {} - {} - {}", CURRENT_NODE.load(Ordering::SeqCst), record.level(), record.args());
+        }
+    }
+
+    #[inline]
+    fn flush(&self) {
+        std::io::stderr().flush().expect("Failed to flush")
+    }
+}
+
+type TestNode<P> = GenericCloud<MockDevice, P, MockSocket, MockTimeSource>;
+
+pub struct Simulator<P: Protocol> {
+    next_port: u16,
+    nodes: HashMap<SocketAddr, TestNode<P>>,
+    messages: VecDeque<(SocketAddr, SocketAddr, Vec<u8>)>,
+}
+
+pub type TapSimulator = Simulator<Frame>;
+#[allow(dead_code)]
+pub type TunSimulator = Simulator<Packet>;
+
+impl<P: Protocol> Simulator<P> {
+    pub fn new() -> Self {
+        init_debug_logger();
+        MockTimeSource::set_time(0);
+        Self { next_port: 1, nodes: HashMap::default(), messages: VecDeque::with_capacity(10) }
+    }
+
+    pub fn add_node(&mut self, nat: bool, config: &Config) -> SocketAddr {
+        let mut config = config.clone();
+        MockSocket::set_nat(nat);
+        config.listen = format!("[::]:{}", self.next_port);
+        let addr = config.listen.parse::<SocketAddr>().unwrap();
+        if config.crypto.password.is_none() && config.crypto.private_key.is_none() {
+            config.crypto.password = Some("test123".to_string())
+        }
+        DebugLogger::set_node(self.next_port as usize);
+        self.next_port += 1;
+        let node = TestNode::new(&config, MockSocket::new(addr), MockDevice::new(), None, None);
+        DebugLogger::set_node(0);
+        self.nodes.insert(addr, node);
+        addr
+    }
+
+    #[allow(dead_code)]
+    pub fn get_node(&mut self, addr: SocketAddr) -> &mut TestNode<P> {
+        let node = self.nodes.get_mut(&addr).unwrap();
+        DebugLogger::set_node(node.get_num());
+        node
+    }
+
+    pub fn simulate_next_message(&mut self) {
+        if let Some((src, dst, data)) = self.messages.pop_front() {
+            if let Some(node) = self.nodes.get_mut(&dst) {
+                if node.socket().put_inbound(src, data) {
+                    DebugLogger::set_node(node.get_num());
+                    node.trigger_socket_event();
+                    DebugLogger::set_node(0);
+                    let sock = node.socket();
+                    let src = dst;
+                    while let Some((dst, data)) = sock.pop_outbound() {
+                        self.messages.push_back((src, dst, data));
+                    }
+                }
+            } else {
+                warn!("Message to unknown node {}", dst);
+            }
+        }
+    }
+
+    pub fn simulate_all_messages(&mut self) {
+        while !self.messages.is_empty() {
+            self.simulate_next_message()
+        }
+    }
+
+    pub fn trigger_node_housekeep(&mut self, addr: SocketAddr) {
+        let node = self.nodes.get_mut(&addr).unwrap();
+        DebugLogger::set_node(node.get_num());
+        node.trigger_housekeep();
+        DebugLogger::set_node(0);
+        let sock = node.socket();
+        while let Some((dst, data)) = sock.pop_outbound() {
+            self.messages.push_back((addr, dst, data));
+        }
+    }
+
+    pub fn trigger_housekeep(&mut self) {
+        for (src, node) in &mut self.nodes {
+            DebugLogger::set_node(node.get_num());
+            node.trigger_housekeep();
+            DebugLogger::set_node(0);
+            let sock = node.socket();
+            while let Some((dst, data)) = sock.pop_outbound() {
+                self.messages.push_back((*src, dst, data));
+            }
+        }
+    }
+
+    pub fn set_time(&mut self, time: Time) {
+        MockTimeSource::set_time(time);
+    }
+
+    pub fn simulate_time(&mut self, time: Time) {
+        let mut t = MockTimeSource::now();
+        while t < time {
+            t += 1;
+            self.set_time(t);
+            self.trigger_housekeep();
+            self.simulate_all_messages();
+        }
+    }
+
+    pub fn connect(&mut self, src: SocketAddr, dst: SocketAddr) {
+        let node = self.nodes.get_mut(&src).unwrap();
+        DebugLogger::set_node(node.get_num());
+        node.connect(dst).unwrap();
+        DebugLogger::set_node(0);
+        let sock = node.socket();
+        while let Some((dst, data)) = sock.pop_outbound() {
+            self.messages.push_back((src, dst, data));
+        }
+    }
+
+    pub fn is_connected(&self, src: SocketAddr, dst: SocketAddr) -> bool {
+        self.nodes.get(&src).unwrap().is_connected(&dst)
+    }
+
+    #[allow(dead_code)]
+    pub fn node_addresses(&self) -> Vec<SocketAddr> {
+        self.nodes.keys().copied().collect()
+    }
+
+    #[allow(dead_code)]
+    pub fn message_count(&self) -> usize {
+        self.messages.len()
+    }
+
+    pub fn put_payload(&mut self, addr: SocketAddr, data: Vec<u8>) {
+        let node = self.nodes.get_mut(&addr).unwrap();
+        node.device().put_inbound(data);
+        DebugLogger::set_node(node.get_num());
+        node.trigger_device_event();
+        DebugLogger::set_node(0);
+        let sock = node.socket();
+        while let Some((dst, data)) = sock.pop_outbound() {
+            self.messages.push_back((addr, dst, data));
+        }
+    }
+
+    pub fn pop_payload(&mut self, node: SocketAddr) -> Option<Vec<u8>> {
+        self.nodes.get_mut(&node).unwrap().device().pop_outbound()
+    }
+
+    pub fn drop_message(&mut self) {
+        self.messages.pop_front();
+    }
+}

src/tests/helper.rs

@@ -1,67 +0,0 @@
-macro_rules! assert_clean {
-    ($($node: expr),*) => {
-        $(
-        assert_eq!($node.socket4().pop_outbound().map(|(addr, mut msg)| (addr, $node.decode_message(&mut msg).unwrap().without_data())), None);
-        assert_eq!($node.socket6().pop_outbound().map(|(addr, mut msg)| (addr, $node.decode_message(&mut msg).unwrap().without_data())), None);
-        assert_eq!($node.device().pop_outbound(), None);
-        )*
-    };
-}
-
-macro_rules! assert_message4 {
-    ($from: expr, $from_addr: expr, $to: expr, $to_addr: expr, $message: expr) => {
-        let (addr, mut data) = msg4_get(&mut $from);
-        assert_eq!($to_addr, addr);
-        {
-            let message = $from.decode_message(&mut data).unwrap();
-            assert_eq!($message, message.without_data());
-        }
-        msg4_put(&mut $to, $from_addr, data);
-    };
-}
-
-#[allow(unused_macros)]
-macro_rules! assert_message6 {
-    ($from: expr, $from_addr: expr, $to: expr, $to_addr: expr, $message: expr) => {
-        let (addr, mut data) = msg6_get(&mut $from);
-        assert_eq!($to_addr, addr);
-        {
-            let message = $from.decode_message(&mut data).unwrap();
-            assert_eq!($message, message.without_data());
-        }
-        msg6_put(&mut $to, $from_addr, data);
-    };
-}
-
-macro_rules! simulate {
-    ($($node: expr => $addr: expr),*) => {
-        simulate(&mut [$((&mut $node, $addr)),*]);
-    };
-}
-
-macro_rules! simulate_time {
-    ($time:expr, $($node: expr => $addr: expr),*) => {
-        for _ in 0..$time {
-            use crate::util::{MockTimeSource, TimeSource};
-            MockTimeSource::set_time(MockTimeSource::now()+1);
-            $(
-                $node.trigger_housekeep();
-            )*
-            simulate(&mut [$((&mut $node, $addr)),*]);
-        }
-    };
-}
-
-
-macro_rules! assert_connected {
-    ($($node:expr),*) => {
-        for node1 in [$(&$node),*].iter() {
-            for node2 in [$(&$node),*].iter() {
-                if node1.node_id() == node2.node_id() {
-                    continue
-                }
-                assert!(node1.peers().contains_node(&node2.node_id()));
-            }
-        }
-    };
-}

src/tests/mod.rs

@@ -1,167 +1,8 @@
 // VpnCloud - Peer-to-Peer VPN
-// Copyright (C) 2015-2019  Dennis Schwerdel
+// Copyright (C) 2015-2021  Dennis Schwerdel
 // This software is licensed under GPL-3 or newer (see LICENSE.md)
 
-#[macro_use]
-mod helper;
+mod common;
 mod nat;
 mod payload;
 mod peers;
-
-pub use std::net::SocketAddr;
-use std::{
-    io::Write,
-    sync::{
-        atomic::{AtomicUsize, Ordering},
-        Once
-    }
-};
-
-pub use super::{
-    cloud::GenericCloud,
-    config::Config,
-    crypto::Crypto,
-    device::MockDevice,
-    ethernet::{self, SwitchTable},
-    ip::{self, RoutingTable},
-    net::MockSocket,
-    types::{Protocol, Range, Table},
-    udpmessage::Message,
-    util::MockTimeSource
-};
-
-
-static INIT_LOGGER: Once = Once::new();
-
-pub fn init_debug_logger() {
-    INIT_LOGGER.call_once(|| {
-        log::set_boxed_logger(Box::new(DebugLogger)).unwrap();
-        log::set_max_level(log::LevelFilter::Debug);
-    })
-}
-
-struct DebugLogger;
-
-impl log::Log for DebugLogger {
-    #[inline]
-    fn enabled(&self, _metadata: &log::Metadata) -> bool {
-        true
-    }
-
-    #[inline]
-    fn log(&self, record: &log::Record) {
-        if self.enabled(record.metadata()) {
-            eprintln!("{} - {}", record.level(), record.args());
-        }
-    }
-
-    #[inline]
-    fn flush(&self) {
-        std::io::stderr().flush().expect("Failed to flush")
-    }
-}
-
-
-type TestNode<P, T> = GenericCloud<MockDevice, P, T, MockSocket, MockTimeSource>;
-
-type TapTestNode = TestNode<ethernet::Frame, SwitchTable<MockTimeSource>>;
-#[allow(dead_code)]
-type TunTestNode = TestNode<ip::Packet, RoutingTable>;
-
-
-thread_local! {
-    static NEXT_PORT: AtomicUsize = AtomicUsize::new(1);
-}
-
-fn create_tap_node(nat: bool) -> TapTestNode {
-    create_tap_node_with_config(nat, Config::default())
-}
-
-fn create_tap_node_with_config(nat: bool, mut config: Config) -> TapTestNode {
-    MockSocket::set_nat(nat);
-    config.port = NEXT_PORT.with(|p| p.fetch_add(1, Ordering::Relaxed)) as u16;
-    TestNode::new(&config, MockDevice::new(), SwitchTable::new(1800, 10), true, true, vec![], Crypto::None, None)
-}
-
-#[allow(dead_code)]
-fn create_tun_node(nat: bool, addresses: Vec<Range>) -> TunTestNode {
-    MockSocket::set_nat(nat);
-    TestNode::new(
-        &Config { port: NEXT_PORT.with(|p| p.fetch_add(1, Ordering::Relaxed)) as u16, ..Config::default() },
-        MockDevice::new(),
-        RoutingTable::new(),
-        false,
-        false,
-        addresses,
-        Crypto::None,
-        None
-    )
-}
-
-
-fn msg4_get<P: Protocol, T: Table>(node: &mut TestNode<P, T>) -> (SocketAddr, Vec<u8>) {
-    let msg = node.socket4().pop_outbound();
-    assert!(msg.is_some());
-    msg.unwrap()
-}
-
-#[allow(dead_code)]
-fn msg6_get<P: Protocol, T: Table>(node: &mut TestNode<P, T>) -> (SocketAddr, Vec<u8>) {
-    let msg = node.socket6().pop_outbound();
-    assert!(msg.is_some());
-    msg.unwrap()
-}
-
-fn msg4_put<P: Protocol, T: Table>(node: &mut TestNode<P, T>, from: SocketAddr, msg: Vec<u8>) {
-    if node.socket4().put_inbound(from, msg) {
-        node.trigger_socket_v4_event();
-    }
-}
-
-fn msg6_put<P: Protocol, T: Table>(node: &mut TestNode<P, T>, from: SocketAddr, msg: Vec<u8>) {
-    if node.socket6().put_inbound(from, msg) {
-        node.trigger_socket_v6_event();
-    }
-}
-
-fn simulate<P: Protocol, T: Table>(nodes: &mut [(&mut TestNode<P, T>, SocketAddr)]) {
-    for (ref mut node, ref _from_addr) in nodes.iter_mut() {
-        while node.device().has_inbound() {
-            node.trigger_device_event();
-        }
-    }
-    let mut clean = false;
-    while !clean {
-        clean = true;
-        let mut msgs = Vec::new();
-        for (ref mut node, ref from_addr) in nodes.iter_mut() {
-            while let Some((to_addr, msg)) = node.socket4().pop_outbound() {
-                msgs.push((msg, *from_addr, to_addr));
-            }
-        }
-        clean &= msgs.is_empty();
-        for (msg, from_addr, to_addr) in msgs {
-            for (ref mut node, ref addr) in nodes.iter_mut() {
-                if *addr == to_addr {
-                    msg4_put(node, from_addr, msg);
-                    break
-                }
-            }
-        }
-        let mut msgs = Vec::new();
-        for (ref mut node, ref from_addr) in nodes.iter_mut() {
-            while let Some((to_addr, msg)) = node.socket6().pop_outbound() {
-                msgs.push((msg, *from_addr, to_addr));
-            }
-        }
-        clean &= msgs.is_empty();
-        for (msg, from_addr, to_addr) in msgs {
-            for (ref mut node, ref addr) in nodes.iter_mut() {
-                if *addr == to_addr {
-                    msg6_put(node, from_addr, msg);
-                    break
-                }
-            }
-        }
-    }
-}

src/tests/nat.rs

@@ -1,86 +1,73 @@
 // VpnCloud - Peer-to-Peer VPN
-// Copyright (C) 2015-2019  Dennis Schwerdel
+// Copyright (C) 2015-2021  Dennis Schwerdel
 // This software is licensed under GPL-3 or newer (see LICENSE.md)
 
-use super::*;
+use super::common::*;
 
 #[test]
 fn connect_nat_2_peers() {
-    init_debug_logger();
-    MockTimeSource::set_time(0);
-    let mut node1 = create_tap_node(true);
-    let node1_addr = addr!("1.2.3.4:5678");
-    let mut node2 = create_tap_node(false);
-    let node2_addr = addr!("2.3.4.5:6789");
+    let config = Config { port_forwarding: false, ..Default::default() };
+    let mut sim = TapSimulator::new();
+    let node1 = sim.add_node(true, &config);
+    let node2 = sim.add_node(true, &config);
 
-    node2.connect("1.2.3.4:5678").unwrap();
+    sim.connect(node1, node2);
+    sim.connect(node2, node1);
 
-    simulate!(node1 => node1_addr, node2 => node2_addr);
+    sim.simulate_time(60);
 
-    assert!(!node1.peers().contains_node(&node2.node_id()));
-    assert!(!node2.peers().contains_node(&node1.node_id()));
-
-
-    node1.connect("2.3.4.5:6789").unwrap();
-
-    simulate!(node1 => node1_addr, node2 => node2_addr);
-
-    assert_connected!(node1, node2);
+    assert!(sim.is_connected(node1, node2));
+    assert!(sim.is_connected(node2, node1));
 }
 
 #[test]
 fn connect_nat_3_peers() {
-    init_debug_logger();
-    MockTimeSource::set_time(0);
-    let mut node1 = create_tap_node(true);
-    let node1_addr = addr!("1.2.3.4:5678");
-    let mut node2 = create_tap_node(false);
-    let node2_addr = addr!("2.3.4.5:6789");
-    let mut node3 = create_tap_node(false);
-    let node3_addr = addr!("3.4.5.6:7890");
-    node2.connect("1.2.3.4:5678").unwrap();
-    node3.connect("1.2.3.4:5678").unwrap();
-    simulate!(node1 => node1_addr, node2 => node2_addr, node3 => node3_addr);
+    let config = Config::default();
+    let mut sim = TapSimulator::new();
+    let node1 = sim.add_node(true, &config);
+    let node2 = sim.add_node(true, &config);
+    let node3 = sim.add_node(true, &config);
 
-    assert!(!node1.peers().contains_node(&node2.node_id()));
-    assert!(!node2.peers().contains_node(&node1.node_id()));
-    assert!(!node3.peers().contains_node(&node1.node_id()));
-    assert!(!node3.peers().contains_node(&node2.node_id()));
-    assert!(!node1.peers().contains_node(&node3.node_id()));
-    assert!(!node2.peers().contains_node(&node3.node_id()));
+    sim.connect(node1, node2);
+    sim.connect(node2, node1);
+    sim.connect(node1, node3);
+    sim.connect(node3, node1);
 
-    node1.connect("3.4.5.6:7890").unwrap();
-    node2.connect("3.4.5.6:7890").unwrap();
-
-    simulate_time!(1000, node1 => node1_addr, node2 => node2_addr, node3 => node3_addr);
-
-    assert_connected!(node1, node3);
-    assert_connected!(node2, node3);
-    assert_connected!(node1, node2);
+    sim.simulate_time(300);
+    assert!(sim.is_connected(node1, node2));
+    assert!(sim.is_connected(node2, node1));
+    assert!(sim.is_connected(node1, node3));
+    assert!(sim.is_connected(node3, node1));
+    assert!(sim.is_connected(node2, node3));
+    assert!(sim.is_connected(node3, node2));
 }
 
 #[test]
 fn nat_keepalive() {
-    init_debug_logger();
-    MockTimeSource::set_time(0);
-    let mut node1 = create_tap_node(true);
-    let node1_addr = addr!("1.2.3.4:5678");
-    let mut node2 = create_tap_node(false);
-    let node2_addr = addr!("2.3.4.5:6789");
-    let mut node3 = create_tap_node(false);
-    let node3_addr = addr!("3.4.5.6:7890");
-    node1.connect("3.4.5.6:7890").unwrap();
-    node2.connect("3.4.5.6:7890").unwrap();
+    let config = Config::default();
+    let mut sim = TapSimulator::new();
+    let node1 = sim.add_node(true, &config);
+    let node2 = sim.add_node(true, &config);
+    let node3 = sim.add_node(true, &config);
 
-    simulate_time!(1000, node1 => node1_addr, node2 => node2_addr, node3 => node3_addr);
+    sim.connect(node1, node2);
+    sim.connect(node2, node1);
+    sim.connect(node1, node3);
+    sim.connect(node3, node1);
 
-    assert_connected!(node1, node3);
-    assert_connected!(node2, node3);
-    assert_connected!(node1, node2);
+    sim.simulate_time(1000);
+    assert!(sim.is_connected(node1, node2));
+    assert!(sim.is_connected(node2, node1));
+    assert!(sim.is_connected(node1, node3));
+    assert!(sim.is_connected(node3, node1));
+    assert!(sim.is_connected(node2, node3));
+    assert!(sim.is_connected(node3, node2));
 
-    simulate_time!(10000, node1 => node1_addr, node2 => node2_addr, node3 => node3_addr);
-
-    assert_connected!(node1, node3);
-    assert_connected!(node2, node3);
-    assert_connected!(node1, node2);
+    sim.simulate_time(10000);
+    assert!(sim.is_connected(node1, node2));
+    assert!(sim.is_connected(node2, node1));
+    assert!(sim.is_connected(node1, node3));
+    assert!(sim.is_connected(node3, node1));
+    assert!(sim.is_connected(node2, node3));
+    assert!(sim.is_connected(node3, node2));
 }

src/tests/payload.rs

@@ -1,86 +1,184 @@
 // VpnCloud - Peer-to-Peer VPN
-// Copyright (C) 2015-2019  Dennis Schwerdel
+// Copyright (C) 2015-2021  Dennis Schwerdel
 // This software is licensed under GPL-3 or newer (see LICENSE.md)
 
-use super::*;
+use super::common::*;
 
 #[test]
-fn ethernet_delivers() {
-    let mut node1 = create_tap_node(false);
-    let node1_addr = addr!("1.2.3.4:5678");
-    let mut node2 = create_tap_node(false);
-    let node2_addr = addr!("2.3.4.5:6789");
+fn switch_delivers() {
+    let config = Config { device_type: Type::Tap, ..Config::default() };
+    let mut sim = TapSimulator::new();
+    let node1 = sim.add_node(false, &config);
+    let node2 = sim.add_node(false, &config);
 
-    node1.connect("2.3.4.5:6789").unwrap();
-    simulate!(node1 => node1_addr, node2 => node2_addr);
-    assert_connected!(node1, node2);
+    sim.connect(node1, node2);
+    sim.simulate_all_messages();
+    assert!(sim.is_connected(node1, node2));
+    assert!(sim.is_connected(node2, node1));
 
     let payload = vec![2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 2, 3, 4, 5];
 
-    node1.device().put_inbound(payload.clone());
+    sim.put_payload(node1, payload.clone());
+    sim.simulate_all_messages();
 
-    simulate!(node1 => node1_addr, node2 => node2_addr);
-
-    assert_eq!(Some(payload), node2.device().pop_outbound());
-
-    assert_clean!(node1, node2);
+    assert_eq!(Some(payload), sim.pop_payload(node2));
 }
 
 #[test]
 fn switch_learns() {
-    let mut node1 = create_tap_node(false);
-    let node1_addr = addr!("1.2.3.4:5678");
-    let mut node2 = create_tap_node(false);
-    let node2_addr = addr!("2.3.4.5:6789");
-    let mut node3 = create_tap_node(false);
-    let node3_addr = addr!("3.4.5.6:7890");
+    let config = Config { device_type: Type::Tap, ..Config::default() };
+    let mut sim = TapSimulator::new();
+    let node1 = sim.add_node(false, &config);
+    let node2 = sim.add_node(false, &config);
+    let node3 = sim.add_node(false, &config);
 
-    node1.connect("2.3.4.5:6789").unwrap();
-    node1.connect("3.4.5.6:7890").unwrap();
-    simulate!(node1 => node1_addr, node2 => node2_addr, node3 => node3_addr);
-    assert_connected!(node1, node2, node3);
+    sim.connect(node1, node2);
+    sim.connect(node1, node3);
+    sim.connect(node2, node3);
+    sim.simulate_all_messages();
+    assert!(sim.is_connected(node1, node2));
+    assert!(sim.is_connected(node2, node1));
+    assert!(sim.is_connected(node1, node3));
+    assert!(sim.is_connected(node3, node1));
+    assert!(sim.is_connected(node2, node3));
+    assert!(sim.is_connected(node3, node2));
 
     let payload = vec![2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 2, 3, 4, 5];
 
     // Nothing learnt so far, node1 broadcasts
 
-    node1.device().put_inbound(payload.clone());
+    sim.put_payload(node1, payload.clone());
+    sim.simulate_all_messages();
 
-    simulate!(node1 => node1_addr, node2 => node2_addr, node3 => node3_addr);
-
-    assert_eq!(Some(&payload), node2.device().pop_outbound().as_ref());
-    assert_eq!(Some(&payload), node3.device().pop_outbound().as_ref());
+    assert_eq!(Some(payload.clone()), sim.pop_payload(node2));
+    assert_eq!(Some(payload), sim.pop_payload(node3));
 
     let payload = vec![1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 5, 4, 3, 2, 1];
 
     // Node 2 learned the address by receiving it, does not broadcast
 
-    node2.device().put_inbound(payload.clone());
+    sim.put_payload(node2, payload.clone());
+    sim.simulate_all_messages();
 
-    simulate!(node1 => node1_addr, node2 => node2_addr, node3 => node3_addr);
-
-    assert_eq!(Some(&payload), node1.device().pop_outbound().as_ref());
-    assert_clean!(node3);
-
-    assert_clean!(node1, node2, node3);
+    assert_eq!(Some(payload), sim.pop_payload(node1));
+    assert_eq!(None, sim.pop_payload(node3));
 }
 
 #[test]
 fn switch_honours_vlans() {
-    // TODO
+    let config = Config { device_type: Type::Tap, ..Config::default() };
+    let mut sim = TapSimulator::new();
+    let node1 = sim.add_node(false, &config);
+    let node2 = sim.add_node(false, &config);
+    let node3 = sim.add_node(false, &config);
+
+    sim.connect(node1, node2);
+    sim.connect(node1, node3);
+    sim.connect(node2, node3);
+    sim.simulate_all_messages();
+    assert!(sim.is_connected(node1, node2));
+    assert!(sim.is_connected(node2, node1));
+    assert!(sim.is_connected(node1, node3));
+    assert!(sim.is_connected(node3, node1));
+    assert!(sim.is_connected(node2, node3));
+    assert!(sim.is_connected(node3, node2));
+
+    let payload = vec![2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 0x81, 0, 0, 0x67, 1, 2, 3, 4, 5];
+
+    // Nothing learnt so far, node1 broadcasts
+
+    sim.put_payload(node1, payload.clone());
+    sim.simulate_all_messages();
+
+    assert_eq!(Some(payload.clone()), sim.pop_payload(node2));
+    assert_eq!(Some(payload), sim.pop_payload(node3));
+
+    let payload = vec![1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 0x81, 0, 0, 0x67, 5, 4, 3, 2, 1];
+
+    // Node 2 learned the address by receiving it, does not broadcast
+
+    sim.put_payload(node2, payload.clone());
+    sim.simulate_all_messages();
+
+    assert_eq!(Some(payload), sim.pop_payload(node1));
+    assert_eq!(None, sim.pop_payload(node3));
+
+    let payload = vec![1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 0x81, 0, 0, 0x68, 5, 4, 3, 2, 1];
+
+    // Different VLANs, node 2 does not learn, still broadcasts
+
+    sim.put_payload(node2, payload.clone());
+    sim.simulate_all_messages();
+
+    assert_eq!(Some(payload.clone()), sim.pop_payload(node1));
+    assert_eq!(Some(payload), sim.pop_payload(node3));
 }
 
 #[test]
+#[ignore]
 fn switch_forgets() {
-    // TODO
+    // TODO Test
+    unimplemented!()
 }
 
 #[test]
 fn router_delivers() {
-    // TODO
+    let config1 = Config {
+        device_type: Type::Tun,
+        auto_claim: false,
+        claims: vec!["1.1.1.1/32".to_string()],
+        ..Config::default()
+    };
+    let config2 = Config {
+        device_type: Type::Tun,
+        auto_claim: false,
+        claims: vec!["2.2.2.2/32".to_string()],
+        ..Config::default()
+    };
+    let mut sim = TunSimulator::new();
+    let node1 = sim.add_node(false, &config1);
+    let node2 = sim.add_node(false, &config2);
+
+    sim.connect(node1, node2);
+    sim.simulate_all_messages();
+    assert!(sim.is_connected(node1, node2));
+    assert!(sim.is_connected(node2, node1));
+
+    let payload = vec![0x40, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 2, 2, 2, 2];
+
+    sim.put_payload(node1, payload.clone());
+    sim.simulate_all_messages();
+
+    assert_eq!(Some(payload), sim.pop_payload(node2));
 }
 
 #[test]
 fn router_drops_unknown_dest() {
-    // TODO
+    let config1 = Config {
+        device_type: Type::Tun,
+        auto_claim: false,
+        claims: vec!["1.1.1.1/32".to_string()],
+        ..Config::default()
+    };
+    let config2 = Config {
+        device_type: Type::Tun,
+        auto_claim: false,
+        claims: vec!["2.2.2.2/32".to_string()],
+        ..Config::default()
+    };
+    let mut sim = TunSimulator::new();
+    let node1 = sim.add_node(false, &config1);
+    let node2 = sim.add_node(false, &config2);
+
+    sim.connect(node1, node2);
+    sim.simulate_all_messages();
+    assert!(sim.is_connected(node1, node2));
+    assert!(sim.is_connected(node2, node1));
+
+    let payload = vec![0x40, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 3, 3, 3, 3];
+
+    sim.put_payload(node1, payload);
+    sim.simulate_all_messages();
+
+    assert_eq!(None, sim.pop_payload(node2));
 }

src/tests/peers.rs

@@ -1,211 +1,179 @@
 // VpnCloud - Peer-to-Peer VPN
-// Copyright (C) 2015-2019  Dennis Schwerdel
+// Copyright (C) 2015-2021  Dennis Schwerdel
 // This software is licensed under GPL-3 or newer (see LICENSE.md)
 
-use super::*;
+use super::common::*;
 
 #[test]
-fn connect_v4() {
-    let mut node1 = create_tap_node(false);
-    let node1_addr = addr!("1.2.3.4:5678");
-    let mut node2 = create_tap_node(false);
-    let node2_addr = addr!("2.3.4.5:6789");
-    assert_clean!(node1, node2);
-    assert!(!node1.peers().contains_node(&node2.node_id()));
-    assert!(!node2.peers().contains_node(&node1.node_id()));
+fn direct_connect() {
+    let config = Config::default();
+    let mut sim = TapSimulator::new();
+    let node1 = sim.add_node(false, &config);
+    let node2 = sim.add_node(false, &config);
 
-    node1.connect("2.3.4.5:6789").unwrap();
-
-    // Node 1 -> Node 2: Init 0
-    assert_message4!(node1, node1_addr, node2, node2_addr, Message::Init(0, node1.node_id(), vec![], 1800));
-    assert_clean!(node1);
-    assert!(node2.peers().contains_node(&node1.node_id()));
-
-    // Node 2 -> Node 1: Init 1 | Node 2 -> Node 1: Peers
-    assert_message4!(node2, node2_addr, node1, node1_addr, Message::Init(1, node2.node_id(), vec![], 1800));
-    assert!(node1.peers().contains_node(&node2.node_id()));
-    assert_message4!(node2, node2_addr, node1, node1_addr, Message::Peers(vec![node1_addr]));
-    assert_clean!(node2);
-
-    // Node 1 -> Node 2: Peers | Node 1 -> Node 1: Init 0
-    assert_message4!(node1, node1_addr, node2, node2_addr, Message::Peers(vec![node2_addr]));
-    assert_message4!(node1, node1_addr, node1, node1_addr, Message::Init(0, node1.node_id(), vec![], 1800));
-    assert!(node1.own_addresses().contains(&node1_addr));
-    assert_clean!(node1);
-
-    // Node 2 -> Node 2: Init 0
-    assert_message4!(node2, node2_addr, node2, node2_addr, Message::Init(0, node2.node_id(), vec![], 1800));
-    assert_clean!(node2);
-    assert!(node2.own_addresses().contains(&node2_addr));
-
-    assert_connected!(node1, node2);
+    sim.connect(node1, node2);
+    sim.simulate_all_messages();
+    assert!(sim.is_connected(node1, node2));
+    assert!(sim.is_connected(node2, node1));
 }
 
 #[test]
-fn connect_v6() {
-    let mut node1 = create_tap_node(false);
-    let node1_addr = addr!("[::1]:5678");
-    let mut node2 = create_tap_node(false);
-    let node2_addr = addr!("[::2]:6789");
+fn direct_connect_unencrypted() {
+    let config = Config {
+        crypto: CryptoConfig { algorithms: vec!["plain".to_string()], ..CryptoConfig::default() },
+        ..Config::default()
+    };
+    let mut sim = TapSimulator::new();
+    let node1 = sim.add_node(false, &config);
+    let node2 = sim.add_node(false, &config);
 
-    node1.connect("[::2]:6789").unwrap();
-
-    simulate!(node1 => node1_addr, node2 => node2_addr);
-
-    assert_connected!(node1, node2);
+    sim.connect(node1, node2);
+    sim.simulate_all_messages();
+    assert!(sim.is_connected(node1, node2));
+    assert!(sim.is_connected(node2, node1));
 }
 
 #[test]
 fn cross_connect() {
-    let mut node1 = create_tap_node(false);
-    let node1_addr = addr!("1.1.1.1:1111");
-    let mut node2 = create_tap_node(false);
-    let node2_addr = addr!("2.2.2.2:2222");
-    let mut node3 = create_tap_node(false);
-    let node3_addr = addr!("3.3.3.3:3333");
-    let mut node4 = create_tap_node(false);
-    let node4_addr = addr!("4.4.4.4:4444");
+    let config = Config::default();
+    let mut sim = TapSimulator::new();
+    let node1 = sim.add_node(false, &config);
+    let node2 = sim.add_node(false, &config);
+    let node3 = sim.add_node(false, &config);
 
-    node1.connect("2.2.2.2:2222").unwrap();
-    node3.connect("4.4.4.4:4444").unwrap();
+    sim.connect(node1, node2);
+    sim.connect(node1, node3);
+    sim.simulate_all_messages();
 
-    simulate!(node1 => node1_addr, node2 => node2_addr, node3 => node3_addr, node4 => node4_addr);
+    sim.simulate_time(120);
 
-    assert_connected!(node1, node2);
-    assert_connected!(node3, node4);
-
-    node1.connect("3.3.3.3:3333").unwrap();
-
-    simulate!(node1 => node1_addr, node2 => node2_addr, node3 => node3_addr, node4 => node4_addr);
-
-    // existing connections
-    assert_connected!(node1, node2);
-    assert_connected!(node3, node4);
-
-    // new connection
-    assert_connected!(node1, node3);
-
-    // transient connections 1st degree
-    assert_connected!(node1, node4);
-    assert_connected!(node3, node2);
-
-    // transient connections 2nd degree
-    assert_connected!(node2, node4);
+    assert!(sim.is_connected(node1, node2));
+    assert!(sim.is_connected(node2, node1));
+    assert!(sim.is_connected(node1, node3));
+    assert!(sim.is_connected(node3, node1));
+    assert!(sim.is_connected(node2, node3));
+    assert!(sim.is_connected(node3, node2));
 }
 
 #[test]
 fn connect_via_beacons() {
-    MockTimeSource::set_time(0);
+    let mut sim = TapSimulator::new();
     let beacon_path = "target/.vpncloud_test";
-    let mut node1 =
-        create_tap_node_with_config(false, Config { beacon_store: Some(beacon_path.to_string()), ..Config::default() });
-    let node1_addr = node1.address().unwrap().0;
-    let mut node2 =
-        create_tap_node_with_config(false, Config { beacon_load: Some(beacon_path.to_string()), ..Config::default() });
-    let node2_addr = addr!("2.2.2.2:2222");
+    let config1 = Config { beacon_store: Some(beacon_path.to_string()), ..Default::default() };
+    let node1 = sim.add_node(false, &config1);
+    let config2 = Config { beacon_load: Some(beacon_path.to_string()), ..Default::default() };
+    let node2 = sim.add_node(false, &config2);
 
-    assert!(!node1.peers().contains_node(&node2.node_id()));
-    assert!(!node2.peers().contains_node(&node1.node_id()));
+    sim.set_time(100);
+    sim.trigger_node_housekeep(node1);
+    sim.trigger_node_housekeep(node2);
+    sim.simulate_all_messages();
 
-    MockTimeSource::set_time(5000);
-    node1.trigger_housekeep();
-
-    MockTimeSource::set_time(10000);
-    node2.trigger_housekeep();
-
-    simulate!(node1 => node1_addr, node2 => node2_addr);
-
-    assert_clean!(node1, node2);
-    assert_connected!(node1, node2);
+    assert!(sim.is_connected(node1, node2));
+    assert!(sim.is_connected(node2, node1));
 }
 
 #[test]
 fn reconnect_after_timeout() {
-    MockTimeSource::set_time(0);
-    let mut node1 = create_tap_node(false);
-    let node1_addr = addr!("1.1.1.1:1111");
-    let mut node2 = create_tap_node(false);
-    let node2_addr = addr!("2.2.2.2:2222");
+    let config = Config::default();
+    let mut sim = TapSimulator::new();
+    let node1 = sim.add_node(false, &config);
+    let node2 = sim.add_node(false, &config);
 
-    node1.add_reconnect_peer("2.2.2.2:2222".to_string());
-    node1.connect(node2_addr).unwrap();
+    sim.connect(node1, node2);
+    sim.simulate_all_messages();
+    assert!(sim.is_connected(node1, node2));
+    assert!(sim.is_connected(node2, node1));
 
-    simulate!(node1 => node1_addr, node2 => node2_addr);
+    sim.set_time(5000);
+    sim.trigger_housekeep();
+    assert!(!sim.is_connected(node1, node2));
+    assert!(!sim.is_connected(node2, node1));
 
-    assert_connected!(node1, node2);
-
-    MockTimeSource::set_time(5000);
-    node1.trigger_housekeep();
-    node2.trigger_housekeep();
-
-    assert!(!node1.peers().contains_node(&node2.node_id()));
-    assert!(!node2.peers().contains_node(&node1.node_id()));
-
-    simulate!(node1 => node1_addr, node2 => node2_addr);
-
-    assert_connected!(node1, node2);
+    sim.simulate_all_messages();
+    assert!(sim.is_connected(node1, node2));
+    assert!(sim.is_connected(node2, node1));
 }
 
 #[test]
-fn lost_init1() {
-    let mut node1 = create_tap_node(false);
-    let node1_addr = addr!("1.2.3.4:5678");
-    let mut node2 = create_tap_node(false);
-    let node2_addr = addr!("2.3.4.5:6789");
+fn lost_init_ping() {
+    let config = Config::default();
+    let mut sim = TapSimulator::new();
+    let node1 = sim.add_node(false, &config);
+    let node2 = sim.add_node(false, &config);
 
-    node1.connect("2.3.4.5:6789").unwrap();
+    sim.connect(node1, node2);
+    sim.drop_message(); // drop init ping
 
-    // Node 1 -> Node 2: Init 0
-    assert_message4!(node1, node1_addr, node2, node2_addr, Message::Init(0, node1.node_id(), vec![], 1800));
-    assert_clean!(node1);
-
-    // Node 2 -> Node 1: Init 1 | Node 2 -> Node 1: Peers
-    assert!(node2.socket4().pop_outbound().is_some());
-    assert!(!node1.peers().contains_node(&node2.node_id()));
-
-    simulate!(node1 => node1_addr, node2 => node2_addr);
-
-    assert_connected!(node1, node2);
+    sim.simulate_time(120);
+    assert!(sim.is_connected(node1, node2));
+    assert!(sim.is_connected(node2, node1));
 }
 
 #[test]
-fn wrong_magic() {
-    let mut node1 = create_tap_node(false);
-    let node1_addr = addr!("1.2.3.4:5678");
-    let mut node2 =
-        create_tap_node_with_config(false, Config { magic: Some("hash:different".to_string()), ..Config::default() });
-    let node2_addr = addr!("2.3.4.5:6789");
-    node1.connect("2.3.4.5:6789").unwrap();
+fn lost_init_pong() {
+    let config = Config::default();
+    let mut sim = TapSimulator::new();
+    let node1 = sim.add_node(false, &config);
+    let node2 = sim.add_node(false, &config);
 
-    assert_message4!(node1, node1_addr, node2, node2_addr, Message::Init(0, node1.node_id(), vec![], 1800));
+    sim.connect(node1, node2);
+    sim.simulate_next_message(); // init ping
+    sim.drop_message(); // drop init pong
 
-    assert_clean!(node1, node2);
-
-    assert!(!node1.peers().contains_node(&node2.node_id()));
-    assert!(!node2.peers().contains_node(&node1.node_id()));
+    sim.simulate_time(120);
+    assert!(sim.is_connected(node1, node2));
+    assert!(sim.is_connected(node2, node1));
 }
 
 #[test]
+fn lost_init_peng() {
+    let config = Config::default();
+    let mut sim = TapSimulator::new();
+    let node1 = sim.add_node(false, &config);
+    let node2 = sim.add_node(false, &config);
+
+    sim.connect(node1, node2);
+    sim.simulate_next_message(); // init ping
+    sim.simulate_next_message(); // init pong
+    sim.drop_message(); // drop init peng
+
+    sim.simulate_time(120);
+    assert!(sim.is_connected(node1, node2));
+    assert!(sim.is_connected(node2, node1));
+}
+
+#[test]
+#[ignore]
 fn peer_exchange() {
-    // TODO
+    // TODO Test
+    unimplemented!()
 }
 
 #[test]
+#[ignore]
 fn lost_peer_exchange() {
-    // TODO
+    // TODO Test
+    unimplemented!()
 }
 
 #[test]
+#[ignore]
 fn remove_dead_peers() {
-    // TODO
+    // TODO Test
+    unimplemented!()
 }
 
 #[test]
+#[ignore]
 fn update_primary_address() {
-    // TODO
+    // TODO Test
+    unimplemented!()
 }
 
 #[test]
+#[ignore]
 fn automatic_peer_timeout() {
-    // TODO
+    // TODO Test
+    unimplemented!()
 }

src/traffic.rs

@@ -1,15 +1,19 @@
 // VpnCloud - Peer-to-Peer VPN
-// Copyright (C) 2018-2019  Dennis Schwerdel
+// Copyright (C) 2015-2021  Dennis Schwerdel
 // This software is licensed under GPL-3 or newer (see LICENSE.md)
 
 use std::{
     collections::HashMap,
     io::{self, Write},
-    net::SocketAddr
+    net::SocketAddr,
+    ops::AddAssign,
 };
 
-use super::{cloud::Hash, types::Address, util::Bytes};
-
+use super::{
+    cloud::{Hash, STATS_INTERVAL},
+    types::Address,
+    util::{addr_nice, Bytes},
+};
 
 #[derive(Default)]
 pub struct TrafficEntry {
@@ -21,7 +25,20 @@ pub struct TrafficEntry {
     pub in_packets_total: usize,
     pub in_bytes: u64,
     pub in_packets: usize,
-    pub idle_periods: usize
+    pub idle_periods: usize,
+}
+
+impl AddAssign<&TrafficEntry> for TrafficEntry {
+    fn add_assign(&mut self, other: &TrafficEntry) {
+        self.out_bytes_total += other.out_bytes_total;
+        self.out_packets_total += other.out_packets_total;
+        self.out_bytes += other.out_bytes;
+        self.out_packets += other.out_packets;
+        self.in_bytes_total += other.in_bytes_total;
+        self.in_packets_total += other.in_packets_total;
+        self.in_bytes += other.in_bytes;
+        self.in_packets += other.in_packets;
+    }
 }
 
 impl TrafficEntry {
@@ -54,32 +71,44 @@ impl TrafficEntry {
     }
 }
 
-
 #[derive(Default)]
 pub struct TrafficStats {
     peers: HashMap<SocketAddr, TrafficEntry, Hash>,
-    payload: HashMap<(Address, Address), TrafficEntry, Hash>
+    payload: HashMap<(Address, Address), TrafficEntry, Hash>,
+    pub dropped: TrafficEntry,
 }
 
 impl TrafficStats {
     #[inline]
     pub fn count_out_traffic(&mut self, peer: SocketAddr, bytes: usize) {
-        self.peers.entry(peer).or_insert_with(TrafficEntry::default).count_out(bytes);
+        // HOT PATH
+        self.peers.entry(peer).or_default().count_out(bytes);
     }
 
     #[inline]
     pub fn count_in_traffic(&mut self, peer: SocketAddr, bytes: usize) {
-        self.peers.entry(peer).or_insert_with(TrafficEntry::default).count_in(bytes);
+        // HOT PATH
+        self.peers.entry(peer).or_default().count_in(bytes);
     }
 
     #[inline]
     pub fn count_out_payload(&mut self, remote: Address, local: Address, bytes: usize) {
-        self.payload.entry((remote, local)).or_insert_with(TrafficEntry::default).count_out(bytes);
+        // HOT PATH
+        self.payload.entry((remote, local)).or_default().count_out(bytes);
     }
 
     #[inline]
     pub fn count_in_payload(&mut self, remote: Address, local: Address, bytes: usize) {
-        self.payload.entry((remote, local)).or_insert_with(TrafficEntry::default).count_in(bytes);
+        // HOT PATH
+        self.payload.entry((remote, local)).or_default().count_in(bytes);
+    }
+
+    pub fn count_invalid_protocol(&mut self, bytes: usize) {
+        self.dropped.count_in(bytes)
+    }
+
+    pub fn count_dropped_payload(&mut self, bytes: usize) {
+        self.dropped.count_out(bytes)
     }
 
     pub fn period(&mut self, cleanup_idle: Option<usize>) {
@@ -89,6 +118,7 @@ impl TrafficStats {
         for entry in self.payload.values_mut() {
             entry.period();
         }
+        self.dropped.period();
         if let Some(periods) = cleanup_idle {
             self.peers.retain(|_, entry| entry.idle_periods < periods);
             self.payload.retain(|_, entry| entry.idle_periods < periods);
@@ -103,28 +133,73 @@ impl TrafficStats {
         self.payload.iter()
     }
 
+    pub fn total_peer_traffic(&self) -> TrafficEntry {
+        let mut total = TrafficEntry::default();
+        for e in self.peers.values() {
+            total += e
+        }
+        total
+    }
+
+    pub fn total_payload_traffic(&self) -> TrafficEntry {
+        let mut total = TrafficEntry::default();
+        for e in self.payload.values() {
+            total += e
+        }
+        total
+    }
+
     #[inline]
     pub fn write_out<W: Write>(&self, out: &mut W) -> Result<(), io::Error> {
-        writeln!(out, "Peer traffic:")?;
+        writeln!(out, "peer_traffic:")?;
         let mut peers: Vec<_> = self.get_peer_traffic().collect();
         peers.sort_unstable_by_key(|(_, data)| (data.out_bytes + data.in_bytes));
         for (addr, data) in peers.iter().rev() {
-            writeln!(out, " - {}: in={}/s, out={}/s", addr, Bytes(data.in_bytes / 60), Bytes(data.out_bytes / 60))?;
+            writeln!(
+                out,
+                "  - peer: \"{}\"\n    in: {{ display: \"{}/s\", bytes: {}, packets: {} }}\n    out: {{ display: \"{}/s\", bytes: {}, packets: {} }}",
+                addr_nice(**addr),
+                Bytes(data.in_bytes / STATS_INTERVAL as u64),
+                data.in_bytes,
+                data.in_packets,
+                Bytes(data.out_bytes / STATS_INTERVAL as u64),
+                data.out_bytes,
+                data.out_packets
+            )?;
         }
         writeln!(out)?;
-        writeln!(out, "Payload traffic:")?;
+        writeln!(out, "payload_traffic:")?;
         let mut payload: Vec<_> = self.get_payload_traffic().collect();
         payload.sort_unstable_by_key(|(_, data)| (data.out_bytes + data.in_bytes));
         for ((remote, local), data) in payload.iter().rev() {
             writeln!(
                 out,
-                " - {} <-> {}: in={}/s, out={}/s",
+                "  - addrs: [\"{}\", \"{}\"]\n    in: {{ display: \"{}/s\", bytes: {}, packets: {} }}\n    out: {{ display: \"{}/s\", bytes: {}, packets: {} }}",
                 remote,
                 local,
-                Bytes(data.in_bytes / 60),
-                Bytes(data.out_bytes / 60)
+                Bytes(data.in_bytes / STATS_INTERVAL as u64),
+                data.in_bytes,
+                data.in_packets,
+                Bytes(data.out_bytes / STATS_INTERVAL as u64),
+                data.out_bytes,
+                data.out_packets
             )?;
         }
+        writeln!(out)?;
+        writeln!(
+            out,
+            "invalid_protocol_traffic: {{ display: \"{}/s\", bytes: {}, packets: {} }}",
+            Bytes(self.dropped.in_bytes / STATS_INTERVAL as u64),
+            self.dropped.in_bytes,
+            self.dropped.in_packets
+        )?;
+        writeln!(
+            out,
+            "dropped_payload_traffic: {{ display: \"{}/s\", bytes: {}, packets: {} }}",
+            Bytes(self.dropped.out_bytes / STATS_INTERVAL as u64),
+            self.dropped.out_bytes,
+            self.dropped.out_packets
+        )?;
         Ok(())
     }
 }

src/types.rs

@@ -1,64 +1,61 @@
 // VpnCloud - Peer-to-Peer VPN
-// Copyright (C) 2015-2019  Dennis Schwerdel
+// Copyright (C) 2015-2021  Dennis Schwerdel
 // This software is licensed under GPL-3 or newer (see LICENSE.md)
 
+use crate::{
+    error::Error,
+    util::{bytes_to_hex, Encoder},
+};
+use byteorder::{ReadBytesExt, WriteBytesExt};
+use smallvec::SmallVec;
 use std::{
     fmt,
     hash::{Hash, Hasher},
-    io::{self, Write},
-    net::{Ipv4Addr, Ipv6Addr, SocketAddr},
-    str::FromStr
+    io::{Read, Write},
+    net::{Ipv4Addr, Ipv6Addr},
+    str::FromStr,
 };
 
-use super::util::{bytes_to_hex, Encoder};
-
 pub const NODE_ID_BYTES: usize = 16;
 
-pub type HeaderMagic = [u8; 4];
 pub type NodeId = [u8; NODE_ID_BYTES];
 
-
 #[derive(Eq, Clone, Copy)]
 pub struct Address {
     pub data: [u8; 16],
-    pub len: u8
+    pub len: u8,
 }
 
 impl Address {
     #[inline]
-    pub fn read_from(data: &[u8]) -> Result<(Address, usize), Error> {
-        if data.is_empty() {
-            return Err(Error::Parse("Address too short"))
-        }
-        let len = data[0] as usize;
-        let addr = Address::read_from_fixed(&data[1..], len)?;
-        Ok((addr, len + 1))
+    pub fn read_from<R: Read>(mut r: R) -> Result<Address, Error> {
+        let len = r.read_u8().map_err(|_| Error::Parse("Address too short"))?;
+        Address::read_from_fixed(r, len)
     }
 
     #[inline]
-    pub fn read_from_fixed(data: &[u8], len: usize) -> Result<Address, Error> {
+    pub fn read_from_fixed<R: Read>(mut r: R, len: u8) -> Result<Address, Error> {
         if len > 16 {
-            return Err(Error::Parse("Invalid address, too long"))
+            return Err(Error::Parse("Invalid address, too long"));
         }
-        if data.len() < len {
-            return Err(Error::Parse("Address too short"))
-        }
-        let mut bytes = [0; 16];
-        bytes[0..len].copy_from_slice(&data[0..len]);
-        Ok(Address { data: bytes, len: len as u8 })
+        let mut data = [0; 16];
+        r.read_exact(&mut data[..len as usize]).map_err(|_| Error::Parse("Address too short"))?;
+        Ok(Address { data, len })
     }
 
     #[inline]
-    pub fn write_to(&self, data: &mut [u8]) -> usize {
-        assert!(data.len() > self.len as usize);
-        data[0] = self.len;
-        let len = self.len as usize;
-        data[1..=len].copy_from_slice(&self.data[0..len]);
-        self.len as usize + 1
+    pub fn write_to<W: Write>(&self, mut w: W) {
+        w.write_u8(self.len).expect("Buffer too small");
+        w.write_all(&self.data[..self.len as usize]).expect("Buffer too small");
+    }
+
+    pub fn from_ipv4(ip: Ipv4Addr) -> Self {
+        let mut data = [0; 16];
+        data[0..4].copy_from_slice(&ip.octets());
+        Self { data, len: 4 }
     }
 }
 
-
 impl PartialEq for Address {
     #[inline]
     fn eq(&self, rhs: &Self) -> bool {
@@ -66,15 +63,13 @@ impl PartialEq for Address {
     }
 }
 
-
 impl Hash for Address {
     #[inline]
     fn hash<H: Hasher>(&self, hasher: &mut H) {
-        hasher.write(&self.data[0..self.len as usize])
+        hasher.write(&self.data[..self.len as usize])
     }
 }
 
-
 impl fmt::Display for Address {
     fn fmt(&self, formatter: &mut fmt::Formatter) -> Result<(), fmt::Error> {
         let d = &self.data;
@@ -89,7 +84,7 @@ impl fmt::Display for Address {
             },
             16 => write!(formatter, "{:02x}{:02x}:{:02x}{:02x}:{:02x}{:02x}:{:02x}{:02x}:{:02x}{:02x}:{:02x}{:02x}:{:02x}{:02x}:{:02x}{:02x}",
                 d[0], d[1], d[2], d[3], d[4], d[5], d[6], d[7], d[8], d[9], d[10], d[11], d[12], d[13], d[14], d[15]),
-            _ => write!(formatter, "{}", bytes_to_hex(&d[0..self.len as usize]))
+            _ => write!(formatter, "{}", bytes_to_hex(&d[..self.len as usize]))
         }
     }
 }
@@ -109,7 +104,7 @@ impl FromStr for Address {
             let ip = addr.octets();
             let mut res = [0; 16];
             res[0..4].copy_from_slice(&ip);
-            return Ok(Address { data: res, len: 4 })
+            return Ok(Address { data: res, len: 4 });
         }
         if let Ok(addr) = Ipv6Addr::from_str(text) {
             let segments = addr.segments();
@@ -117,44 +112,55 @@ impl FromStr for Address {
             for i in 0..8 {
                 Encoder::write_u16(segments[i], &mut res[2 * i..]);
             }
-            return Ok(Address { data: res, len: 16 })
+            return Ok(Address { data: res, len: 16 });
         }
-        let parts: Vec<&str> = text.split(':').collect();
+        let parts: SmallVec<[&str; 10]> = text.split(':').collect();
         if parts.len() == 6 {
             let mut bytes = [0; 16];
             for i in 0..6 {
                 bytes[i] = u8::from_str_radix(parts[i], 16).map_err(|_| Error::Parse("Failed to parse mac"))?;
             }
-            return Ok(Address { data: bytes, len: 6 })
+            return Ok(Address { data: bytes, len: 6 });
         }
         Err(Error::Parse("Failed to parse address"))
     }
 }
 
-
 #[derive(PartialEq, Eq, Hash, Clone, Copy)]
 pub struct Range {
     pub base: Address,
-    pub prefix_len: u8
+    pub prefix_len: u8,
 }
 
+pub type RangeList = SmallVec<[Range; 4]>;
+
 impl Range {
-    #[inline]
-    pub fn read_from(data: &[u8]) -> Result<(Range, usize), Error> {
-        let (address, read) = Address::read_from(data)?;
-        if data.len() < read + 1 {
-            return Err(Error::Parse("Range too short"))
+    pub fn matches(&self, addr: Address) -> bool {
+        if self.base.len != addr.len {
+            return false;
         }
-        let prefix_len = data[read];
-        Ok((Range { base: address, prefix_len }, read + 1))
+        let mut match_len = 0;
+        for i in 0..addr.len as usize {
+            let m = addr.data[i] ^ self.base.data[i];
+            match_len += m.leading_zeros() as u8;
+            if m != 0 {
+                break;
+            }
+        }
+        match_len >= self.prefix_len
     }
 
     #[inline]
-    pub fn write_to(&self, data: &mut [u8]) -> usize {
-        let pos = self.base.write_to(data);
-        assert!(data.len() > pos);
-        data[pos] = self.prefix_len;
-        pos + 1
+    pub fn read_from<R: Read>(mut r: R) -> Result<Range, Error> {
+        let base = Address::read_from(&mut r)?;
+        let prefix_len = r.read_u8().map_err(|_| Error::Parse("Address too short"))?;
+        Ok(Range { base, prefix_len })
+    }
+
+    #[inline]
+    pub fn write_to<W: Write>(&self, mut w: W) {
+        self.base.write_to(&mut w);
+        w.write_u8(self.prefix_len).expect("Buffer too small")
     }
 }
 
@@ -164,7 +170,7 @@ impl FromStr for Range {
     fn from_str(text: &str) -> Result<Self, Self::Err> {
         let pos = match text.find('/') {
             Some(pos) => pos,
-            None => return Err(Error::Parse("Invalid range format"))
+            None => return Err(Error::Parse("Invalid range format")),
         };
         let prefix_len = u8::from_str(&text[pos + 1..]).map_err(|_| Error::Parse("Failed to parse prefix length"))?;
         let base = Address::from_str(&text[..pos])?;
@@ -184,7 +190,6 @@ impl fmt::Debug for Range {
     }
 }
 
-
 #[derive(Serialize, Deserialize, Debug, Clone, Copy, PartialEq)]
 pub enum Mode {
     #[serde(rename = "normal")]
@@ -194,7 +199,7 @@ pub enum Mode {
     #[serde(rename = "switch")]
     Switch,
     #[serde(rename = "router")]
-    Router
+    Router,
 }
 impl fmt::Display for Mode {
     fn fmt(&self, formatter: &mut fmt::Formatter) -> Result<(), fmt::Error> {
@@ -202,116 +207,98 @@ impl fmt::Display for Mode {
             Mode::Normal => write!(formatter, "normal"),
             Mode::Hub => write!(formatter, "hub"),
             Mode::Switch => write!(formatter, "switch"),
-            Mode::Router => write!(formatter, "router")
+            Mode::Router => write!(formatter, "router"),
         }
     }
 }
+impl FromStr for Mode {
+    type Err = &'static str;
 
-pub trait Table {
-    fn learn(&mut self, _: Address, _: Option<u8>, _: SocketAddr);
-    fn lookup(&mut self, _: &Address) -> Option<SocketAddr>;
-    fn housekeep(&mut self);
-    fn write_out<W: Write>(&self, out: &mut W) -> Result<(), io::Error>;
-    fn remove(&mut self, _: &Address) -> bool;
-    fn remove_all(&mut self, _: &SocketAddr);
-}
-
-pub trait Protocol: Sized {
-    fn parse(_: &[u8]) -> Result<(Address, Address), Error>;
-}
-
-#[derive(Debug)]
-pub enum Error {
-    Parse(&'static str),
-    WrongHeaderMagic(HeaderMagic),
-    Socket(&'static str, io::Error),
-    Name(String),
-    TunTapDev(&'static str, io::Error),
-    Crypto(&'static str),
-    File(&'static str, io::Error),
-    Beacon(&'static str, io::Error)
-}
-impl fmt::Display for Error {
-    fn fmt(&self, formatter: &mut fmt::Formatter) -> Result<(), fmt::Error> {
-        match *self {
-            Error::Parse(msg) => write!(formatter, "{}", msg),
-            Error::Socket(msg, ref err) => write!(formatter, "{}: {:?}", msg, err),
-            Error::TunTapDev(msg, ref err) => write!(formatter, "{}: {:?}", msg, err),
-            Error::Crypto(msg) => write!(formatter, "{}", msg),
-            Error::Name(ref name) => write!(formatter, "failed to resolve name '{}'", name),
-            Error::WrongHeaderMagic(net) => write!(formatter, "wrong header magic: {}", bytes_to_hex(&net)),
-            Error::File(msg, ref err) => write!(formatter, "{}: {:?}", msg, err),
-            Error::Beacon(msg, ref err) => write!(formatter, "{}: {:?}", msg, err)
-        }
+    fn from_str(text: &str) -> Result<Self, Self::Err> {
+        Ok(match &text.to_lowercase() as &str {
+            "normal" => Self::Normal,
+            "hub" => Self::Hub,
+            "switch" => Self::Switch,
+            "router" => Self::Router,
+            _ => return Err("Unknown mode"),
+        })
     }
 }
 
+#[cfg(test)]
+mod tests {
 
-#[test]
-fn address_parse_fmt() {
-    assert_eq!(format!("{}", Address::from_str("120.45.22.5").unwrap()), "120.45.22.5");
-    assert_eq!(format!("{}", Address::from_str("78:2d:16:05:01:02").unwrap()), "78:2d:16:05:01:02");
-    assert_eq!(
-        format!("{}", Address { data: [3, 56, 120, 45, 22, 5, 1, 2, 0, 0, 0, 0, 0, 0, 0, 0], len: 8 }),
-        "vlan824/78:2d:16:05:01:02"
-    );
-    assert_eq!(
-        format!("{}", Address::from_str("0001:0203:0405:0607:0809:0a0b:0c0d:0e0f").unwrap()),
-        "0001:0203:0405:0607:0809:0a0b:0c0d:0e0f"
-    );
-    assert_eq!(format!("{:?}", Address { data: [1, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0], len: 2 }), "0102");
-    assert!(Address::from_str("").is_err()); // Failed to parse address
-}
+    use super::*;
 
-#[test]
-fn address_decode_encode() {
-    let mut buf = [0; 32];
-    let addr = Address::from_str("120.45.22.5").unwrap();
-    assert_eq!(addr.write_to(&mut buf), 5);
-    assert_eq!(&buf[0..5], &[4, 120, 45, 22, 5]);
-    assert_eq!((addr, 5), Address::read_from(&buf).unwrap());
-    assert_eq!(addr, Address::read_from_fixed(&buf[1..], 4).unwrap());
-    let addr = Address::from_str("78:2d:16:05:01:02").unwrap();
-    assert_eq!(addr.write_to(&mut buf), 7);
-    assert_eq!(&buf[0..7], &[6, 0x78, 0x2d, 0x16, 0x05, 0x01, 0x02]);
-    assert_eq!((addr, 7), Address::read_from(&buf).unwrap());
-    assert_eq!(addr, Address::read_from_fixed(&buf[1..], 6).unwrap());
-    assert!(Address::read_from(&buf[0..0]).is_err()); // Address too short
-    buf[0] = 100;
-    assert!(Address::read_from(&buf).is_err()); // Invalid address, too long
-    buf[0] = 5;
-    assert!(Address::read_from(&buf[0..4]).is_err()); // Address too short
-}
+    use std::io::Cursor;
 
-#[test]
-fn address_eq() {
-    assert_eq!(
-        Address::read_from_fixed(&[1, 2, 3, 4], 4).unwrap(),
-        Address::read_from_fixed(&[1, 2, 3, 4], 4).unwrap()
-    );
-    assert_ne!(
-        Address::read_from_fixed(&[1, 2, 3, 4], 4).unwrap(),
-        Address::read_from_fixed(&[1, 2, 3, 5], 4).unwrap()
-    );
-    assert_eq!(
-        Address::read_from_fixed(&[1, 2, 3, 4], 3).unwrap(),
-        Address::read_from_fixed(&[1, 2, 3, 5], 3).unwrap()
-    );
-    assert_ne!(
-        Address::read_from_fixed(&[1, 2, 3, 4], 3).unwrap(),
-        Address::read_from_fixed(&[1, 2, 3, 4], 4).unwrap()
-    );
-}
+    #[test]
+    fn address_parse_fmt() {
+        assert_eq!(format!("{}", Address::from_str("120.45.22.5").unwrap()), "120.45.22.5");
+        assert_eq!(format!("{}", Address::from_str("78:2d:16:05:01:02").unwrap()), "78:2d:16:05:01:02");
+        assert_eq!(
+            format!("{}", Address { data: [3, 56, 120, 45, 22, 5, 1, 2, 0, 0, 0, 0, 0, 0, 0, 0], len: 8 }),
+            "vlan824/78:2d:16:05:01:02"
+        );
+        assert_eq!(
+            format!("{}", Address::from_str("0001:0203:0405:0607:0809:0a0b:0c0d:0e0f").unwrap()),
+            "0001:0203:0405:0607:0809:0a0b:0c0d:0e0f"
+        );
+        assert_eq!(format!("{:?}", Address { data: [1, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0], len: 2 }), "0102");
+        assert!(Address::from_str("").is_err()); // Failed to parse address
+    }
 
-#[test]
-fn address_range_decode_encode() {
-    let mut buf = [0; 32];
-    let range =
-        Range { base: Address { data: [0, 1, 2, 3, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0], len: 4 }, prefix_len: 24 };
-    assert_eq!(range.write_to(&mut buf), 6);
-    assert_eq!(&buf[0..6], &[4, 0, 1, 2, 3, 24]);
-    assert_eq!((range, 6), Range::read_from(&buf).unwrap());
-    assert!(Range::read_from(&buf[..5]).is_err()); // Missing prefix length
-    buf[0] = 17;
-    assert!(Range::read_from(&buf).is_err());
+    #[test]
+    fn address_decode_encode() {
+        let mut buf = vec![];
+        let addr = Address::from_str("120.45.22.5").unwrap();
+        addr.write_to(Cursor::new(&mut buf));
+        assert_eq!(&buf[0..5], &[4, 120, 45, 22, 5]);
+        assert_eq!(addr, Address::read_from(Cursor::new(&buf)).unwrap());
+        assert_eq!(addr, Address::read_from_fixed(Cursor::new(&buf[1..]), 4).unwrap());
+        buf.clear();
+        let addr = Address::from_str("78:2d:16:05:01:02").unwrap();
+        addr.write_to(Cursor::new(&mut buf));
+        assert_eq!(&buf[0..7], &[6, 0x78, 0x2d, 0x16, 0x05, 0x01, 0x02]);
+        assert_eq!(addr, Address::read_from(Cursor::new(&buf)).unwrap());
+        assert_eq!(addr, Address::read_from_fixed(Cursor::new(&buf[1..]), 6).unwrap());
+        assert!(Address::read_from(Cursor::new(&buf[0..1])).is_err()); // Address too short
+        buf[0] = 100;
+        assert!(Address::read_from(Cursor::new(&buf)).is_err()); // Invalid address, too long
+        buf[0] = 5;
+        assert!(Address::read_from(Cursor::new(&buf[0..4])).is_err()); // Address too short
+    }
+
+    #[test]
+    fn address_eq() {
+        assert_eq!(
+            Address::read_from_fixed(Cursor::new(&[1, 2, 3, 4]), 4).unwrap(),
+            Address::read_from_fixed(Cursor::new(&[1, 2, 3, 4]), 4).unwrap()
+        );
+        assert_ne!(
+            Address::read_from_fixed(Cursor::new(&[1, 2, 3, 4]), 4).unwrap(),
+            Address::read_from_fixed(Cursor::new(&[1, 2, 3, 5]), 4).unwrap()
+        );
+        assert_eq!(
+            Address::read_from_fixed(Cursor::new(&[1, 2, 3, 4]), 3).unwrap(),
+            Address::read_from_fixed(Cursor::new(&[1, 2, 3, 5]), 3).unwrap()
+        );
+        assert_ne!(
+            Address::read_from_fixed(Cursor::new(&[1, 2, 3, 4]), 3).unwrap(),
+            Address::read_from_fixed(Cursor::new(&[1, 2, 3, 4]), 4).unwrap()
+        );
+    }
+
+    #[test]
+    fn address_range_decode_encode() {
+        let mut buf = vec![];
+        let range =
+            Range { base: Address { data: [0, 1, 2, 3, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0], len: 4 }, prefix_len: 24 };
+        range.write_to(Cursor::new(&mut buf));
+        assert_eq!(&buf[0..6], &[4, 0, 1, 2, 3, 24]);
+        assert_eq!(range, Range::read_from(Cursor::new(&buf)).unwrap());
+        assert!(Range::read_from(Cursor::new(&buf[..5])).is_err()); // Missing prefix length
+        buf[0] = 17;
+        assert!(Range::read_from(Cursor::new(&buf)).is_err());
+    }
 }

src/udpmessage.rs

@@ -1,524 +0,0 @@
-// VpnCloud - Peer-to-Peer VPN
-// Copyright (C) 2015-2019  Dennis Schwerdel
-// This software is licensed under GPL-3 or newer (see LICENSE.md)
-
-use std::{
-    fmt,
-    net::{Ipv4Addr, Ipv6Addr, SocketAddr, SocketAddrV4, SocketAddrV6}
-};
-
-use super::{
-    crypto::Crypto,
-    types::{Error, HeaderMagic, NodeId, Range, NODE_ID_BYTES},
-    util::{bytes_to_hex, Encoder}
-};
-
-#[derive(Clone, Copy, Default)]
-#[repr(packed)]
-struct TopHeader {
-    magic: HeaderMagic,
-    crypto_method: u8,
-    _reserved1: u8,
-    _reserved2: u8,
-    msgtype: u8
-}
-
-impl TopHeader {
-    #[inline]
-    pub fn size() -> usize {
-        8
-    }
-
-    pub fn read_from(data: &[u8]) -> Result<(TopHeader, usize), Error> {
-        if data.len() < TopHeader::size() {
-            return Err(Error::Parse("Empty message"))
-        }
-        let mut header = TopHeader::default();
-        header.magic.copy_from_slice(&data[0..4]);
-        header.crypto_method = data[4];
-        header.msgtype = data[7];
-        Ok((header, TopHeader::size()))
-    }
-
-    #[allow(unknown_lints, clippy::trivially_copy_pass_by_ref)]
-    pub fn write_to(&self, data: &mut [u8]) -> usize {
-        assert!(data.len() >= 8);
-        data[0..4].copy_from_slice(&self.magic);
-        data[4] = self.crypto_method;
-        data[5] = 0;
-        data[6] = 0;
-        data[7] = self.msgtype;
-        TopHeader::size()
-    }
-}
-
-pub enum Message<'a> {
-    Data(&'a mut [u8], usize, usize),  // data, start, end
-    Peers(Vec<SocketAddr>),            // peers
-    Init(u8, NodeId, Vec<Range>, u16), // step, node_id, ranges
-    Close
-}
-
-impl<'a> Message<'a> {
-    pub fn without_data(self) -> Message<'static> {
-        match self {
-            Message::Data(_, start, end) => Message::Data(&mut [], start, end),
-            Message::Peers(peers) => Message::Peers(peers),
-            Message::Init(step, node_id, ranges, timeout) => Message::Init(step, node_id, ranges, timeout),
-            Message::Close => Message::Close
-        }
-    }
-}
-
-impl<'a> fmt::Debug for Message<'a> {
-    fn fmt(&self, formatter: &mut fmt::Formatter) -> Result<(), fmt::Error> {
-        match *self {
-            Message::Data(_, start, end) => write!(formatter, "Data({} bytes)", end - start),
-            Message::Peers(ref peers) => {
-                write!(formatter, "Peers [")?;
-                let mut first = true;
-                for p in peers {
-                    if !first {
-                        write!(formatter, ", ")?;
-                    }
-                    first = false;
-                    write!(formatter, "{}", p)?;
-                }
-                write!(formatter, "]")
-            }
-            Message::Init(stage, ref node_id, ref peers, ref peer_timeout) => {
-                write!(
-                    formatter,
-                    "Init(stage={}, node_id={}, peer_timeout={}, {:?})",
-                    stage,
-                    bytes_to_hex(node_id),
-                    peer_timeout,
-                    peers
-                )
-            }
-            Message::Close => write!(formatter, "Close")
-        }
-    }
-}
-
-#[allow(unknown_lints, clippy::needless_range_loop)]
-pub fn decode<'a>(data: &'a mut [u8], magic: HeaderMagic, crypto: &Crypto) -> Result<Message<'a>, Error> {
-    let mut end = data.len();
-    let (header, mut pos) = TopHeader::read_from(&data[..end])?;
-    if header.magic != magic {
-        return Err(Error::WrongHeaderMagic(header.magic))
-    }
-    if header.crypto_method != crypto.method() {
-        return Err(Error::Crypto("Wrong crypto method"))
-    }
-    if crypto.method() > 0 {
-        let len = crypto.nonce_bytes();
-        if end < pos + len {
-            return Err(Error::Parse("Truncated crypto header"))
-        }
-        {
-            let (before, after) = data.split_at_mut(pos);
-            let (nonce, crypto_data) = after.split_at_mut(len);
-            pos += len;
-            end = crypto.decrypt(crypto_data, nonce, &before[..TopHeader::size()])? + pos;
-        }
-        assert_eq!(end, data.len() - crypto.additional_bytes());
-    }
-    let msg = match header.msgtype {
-        0 => Message::Data(data, pos, end),
-        1 => {
-            if end < pos + 1 {
-                return Err(Error::Parse("Missing IPv4 count"))
-            }
-            let mut peers = Vec::new();
-            let count = data[pos];
-            pos += 1;
-            let len = count as usize * 6;
-            if end < pos + len {
-                return Err(Error::Parse("IPv4 peer data too short"))
-            }
-            for _ in 0..count {
-                let ip = &data[pos..];
-                assert!(ip.len() >= 4);
-                pos += 4;
-                let port = Encoder::read_u16(&data[pos..]);
-                pos += 2;
-                let addr = SocketAddr::V4(SocketAddrV4::new(Ipv4Addr::new(ip[0], ip[1], ip[2], ip[3]), port));
-                peers.push(addr);
-            }
-            if end < pos + 1 {
-                return Err(Error::Parse("Missing IPv6 count"))
-            }
-            let count = data[pos];
-            pos += 1;
-            let len = count as usize * 18;
-            if end < pos + len {
-                return Err(Error::Parse("IPv6 peer data too short"))
-            }
-            for _ in 0..count {
-                let mut ip = [0u16; 8];
-                for i in 0..8 {
-                    ip[i] = Encoder::read_u16(&data[pos..]);
-                    pos += 2;
-                }
-                let port = Encoder::read_u16(&data[pos..]);
-                pos += 2;
-                let addr = SocketAddr::V6(SocketAddrV6::new(
-                    Ipv6Addr::new(ip[0], ip[1], ip[2], ip[3], ip[4], ip[5], ip[6], ip[7]),
-                    port,
-                    0,
-                    0
-                ));
-                peers.push(addr);
-            }
-            Message::Peers(peers)
-        }
-        2 => {
-            if end < pos + 2 + NODE_ID_BYTES {
-                return Err(Error::Parse("Init data too short"))
-            }
-            let stage = data[pos];
-            pos += 1;
-            let mut node_id = [0; NODE_ID_BYTES];
-            node_id.copy_from_slice(&data[pos..pos + NODE_ID_BYTES]);
-            pos += NODE_ID_BYTES;
-            let count = data[pos] as usize;
-            pos += 1;
-            let mut addrs = Vec::with_capacity(count);
-            for _ in 0..count {
-                let (range, read) = Range::read_from(&data[pos..end])?;
-                pos += read;
-                addrs.push(range);
-            }
-            let mut peer_timeout = 1800;
-            if data.len() >= pos + 2 {
-                peer_timeout = Encoder::read_u16(&data[pos..]);
-                // pos += 2; never read
-            }
-            Message::Init(stage, node_id, addrs, peer_timeout)
-        }
-        3 => Message::Close,
-        _ => return Err(Error::Parse("Unknown message type"))
-    };
-    Ok(msg)
-}
-
-#[allow(unknown_lints, clippy::needless_range_loop)]
-pub fn encode<'a>(
-    msg: &'a mut Message, mut buf: &'a mut [u8], magic: HeaderMagic, crypto: &mut Crypto
-) -> &'a mut [u8] {
-    let header_type = match msg {
-        Message::Data(_, _, _) => 0,
-        Message::Peers(_) => 1,
-        Message::Init(_, _, _, _) => 2,
-        Message::Close => 3
-    };
-    let mut start = 64;
-    let mut end = 64;
-    match *msg {
-        Message::Data(ref mut data, data_start, data_end) => {
-            buf = data;
-            start = data_start;
-            end = data_end;
-        }
-        Message::Peers(ref peers) => {
-            let mut v4addrs = Vec::new();
-            let mut v6addrs = Vec::new();
-            for p in peers {
-                match *p {
-                    SocketAddr::V4(addr) => v4addrs.push(addr),
-                    SocketAddr::V6(addr) => v6addrs.push(addr)
-                }
-            }
-            assert!(v4addrs.len() <= 255);
-            assert!(v6addrs.len() <= 255);
-            let mut pos = start;
-            assert!(buf.len() >= pos + 2 + v4addrs.len() * 6 + v6addrs.len() * 18);
-            buf[pos] = v4addrs.len() as u8;
-            pos += 1;
-            for addr in v4addrs {
-                let ip = addr.ip().octets();
-                buf[pos..pos + 4].copy_from_slice(&ip);
-                pos += 4;
-                Encoder::write_u16(addr.port(), &mut buf[pos..]);
-                pos += 2;
-            }
-            buf[pos] = v6addrs.len() as u8;
-            pos += 1;
-            for addr in v6addrs {
-                let ip = addr.ip().segments();
-                for i in 0..8 {
-                    Encoder::write_u16(ip[i], &mut buf[pos..]);
-                    pos += 2;
-                }
-                Encoder::write_u16(addr.port(), &mut buf[pos..]);
-                pos += 2;
-            }
-            end = pos;
-        }
-        Message::Init(stage, ref node_id, ref ranges, peer_timeout) => {
-            let mut pos = start;
-            assert!(buf.len() >= pos + 2 + NODE_ID_BYTES);
-            buf[pos] = stage;
-            pos += 1;
-            buf[pos..pos + NODE_ID_BYTES].copy_from_slice(node_id);
-            pos += NODE_ID_BYTES;
-            assert!(ranges.len() <= 255);
-            buf[pos] = ranges.len() as u8;
-            pos += 1;
-            for range in ranges {
-                pos += range.write_to(&mut buf[pos..]);
-            }
-            Encoder::write_u16(peer_timeout, &mut buf[pos..]);
-            pos += 2;
-            end = pos;
-        }
-        Message::Close => {}
-    }
-    assert!(start >= 64);
-    assert!(buf.len() >= end + 64);
-    let crypto_start = start;
-    start -= crypto.nonce_bytes();
-    let mut header = TopHeader::default();
-    header.magic = magic;
-    header.msgtype = header_type;
-    header.crypto_method = crypto.method();
-    start -= TopHeader::size();
-    header.write_to(&mut buf[start..]);
-    if crypto.method() > 0 {
-        let (junk_before, rest) = buf.split_at_mut(start);
-        let (header, rest) = rest.split_at_mut(TopHeader::size());
-        let (nonce, rest) = rest.split_at_mut(crypto.nonce_bytes());
-        debug_assert_eq!(junk_before.len() + header.len() + crypto.nonce_bytes(), crypto_start);
-        assert!(rest.len() >= end - crypto_start + crypto.additional_bytes());
-        end = crypto.encrypt(rest, end - crypto_start, nonce, header) + crypto_start;
-    }
-    &mut buf[start..end]
-}
-
-impl<'a> PartialEq for Message<'a> {
-    fn eq(&self, other: &Message) -> bool {
-        match *self {
-            Message::Data(ref data1, start1, end1) => {
-                if let Message::Data(ref data2, start2, end2) = *other {
-                    data1[start1..end1] == data2[start2..end2]
-                } else {
-                    false
-                }
-            }
-            Message::Peers(ref peers1) => {
-                if let Message::Peers(ref peers2) = *other {
-                    peers1 == peers2
-                } else {
-                    false
-                }
-            }
-            Message::Init(step1, node_id1, ref ranges1, peer_timeout1) => {
-                if let Message::Init(step2, node_id2, ref ranges2, peer_timeout2) = *other {
-                    step1 == step2 && node_id1 == node_id2 && ranges1 == ranges2 && peer_timeout1 == peer_timeout2
-                } else {
-                    false
-                }
-            }
-            Message::Close => {
-                if let Message::Close = *other {
-                    true
-                } else {
-                    false
-                }
-            }
-        }
-    }
-}
-
-#[cfg(test)] use super::crypto::CryptoMethod;
-#[cfg(test)] use super::types::Address;
-#[cfg(test)] use super::MAGIC;
-#[cfg(test)] use std::str::FromStr;
-
-#[test]
-#[allow(unused_assignments)]
-fn udpmessage_packet() {
-    let mut crypto = Crypto::None;
-    let mut payload = [
-        0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
-        0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 2, 3, 4, 5, 0, 0, 0, 0, 0,
-        0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
-        0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
-    ];
-    let mut msg = Message::Data(&mut payload, 64, 69);
-    let mut buf = [0; 1024];
-    let mut len = 0;
-    {
-        let res = encode(&mut msg, &mut [], MAGIC, &mut crypto);
-        assert_eq!(res.len(), 13);
-        assert_eq!(&res[..8], &[118, 112, 110, 1, 0, 0, 0, 0]);
-        for i in 0..res.len() {
-            buf[i] = res[i];
-        }
-        len = res.len();
-    }
-    let msg2 = decode(&mut buf[..len], MAGIC, &mut crypto).unwrap();
-    assert_eq!(msg, msg2);
-}
-
-#[test]
-#[allow(unused_assignments)]
-fn udpmessage_encrypted() {
-    let mut crypto = Crypto::from_shared_key(CryptoMethod::ChaCha20, "test");
-    let mut payload = [
-        0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
-        0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 2, 3, 4, 5, 0, 0, 0, 0, 0,
-        0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
-        0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
-    ];
-    let mut orig_payload = [0; 133];
-    for i in 0..payload.len() {
-        orig_payload[i] = payload[i];
-    }
-    let orig_msg = Message::Data(&mut orig_payload, 64, 69);
-    let mut msg = Message::Data(&mut payload, 64, 69);
-    let mut buf = [0; 1024];
-    let mut len = 0;
-    {
-        let res = encode(&mut msg, &mut [], MAGIC, &mut crypto);
-        assert_eq!(res.len(), 41);
-        assert_eq!(&res[..8], &[118, 112, 110, 1, 1, 0, 0, 0]);
-        for i in 0..res.len() {
-            buf[i] = res[i];
-        }
-        len = res.len();
-    }
-    let msg2 = decode(&mut buf[..len], MAGIC, &mut crypto).unwrap();
-    assert_eq!(orig_msg, msg2);
-}
-
-#[test]
-fn udpmessage_peers() {
-    use std::str::FromStr;
-    let mut crypto = Crypto::None;
-    let mut msg = Message::Peers(vec![
-        SocketAddr::from_str("1.2.3.4:123").unwrap(),
-        SocketAddr::from_str("5.6.7.8:12345").unwrap(),
-        SocketAddr::from_str("[0001:0203:0405:0607:0809:0a0b:0c0d:0e0f]:6789").unwrap(),
-    ]);
-    let mut should = [
-        118, 112, 110, 1, 0, 0, 0, 1, 2, 1, 2, 3, 4, 0, 123, 5, 6, 7, 8, 48, 57, 1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10,
-        11, 12, 13, 14, 15, 26, 133
-    ];
-    {
-        let mut buf = [0; 1024];
-        let res = encode(&mut msg, &mut buf[..], MAGIC, &mut crypto);
-        assert_eq!(res.len(), 40);
-        for i in 0..res.len() {
-            assert_eq!(res[i], should[i]);
-        }
-    }
-    let msg2 = decode(&mut should, MAGIC, &mut crypto).unwrap();
-    assert_eq!(msg, msg2);
-    // Missing IPv4 count
-    assert!(decode(&mut [118, 112, 110, 1, 0, 0, 0, 1], MAGIC, &mut crypto).is_err());
-    // Truncated IPv4
-    assert!(decode(&mut [118, 112, 110, 1, 0, 0, 0, 1, 1], MAGIC, &mut crypto).is_err());
-    // Missing IPv6 count
-    assert!(decode(&mut [118, 112, 110, 1, 0, 0, 0, 1, 1, 1, 2, 3, 4, 0, 0], MAGIC, &mut crypto).is_err());
-    // Truncated IPv6
-    assert!(decode(&mut [118, 112, 110, 1, 0, 0, 0, 1, 1, 1, 2, 3, 4, 0, 0, 1], MAGIC, &mut crypto).is_err());
-}
-
-#[test]
-fn udpmessage_init() {
-    use super::types::Address;
-    let mut crypto = Crypto::None;
-    let addrs = vec![
-        Range { base: Address { data: [0, 1, 2, 3, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0], len: 4 }, prefix_len: 24 },
-        Range { base: Address { data: [0, 1, 2, 3, 4, 5, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0], len: 6 }, prefix_len: 16 },
-    ];
-    let node_id = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15];
-    let mut msg = Message::Init(0, node_id, addrs, 1800);
-    let mut should = [
-        118, 112, 110, 1, 0, 0, 0, 2, 0, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 2, 4, 0, 1, 2, 3, 24, 6,
-        0, 1, 2, 3, 4, 5, 16, 7, 8
-    ];
-    {
-        let mut buf = [0; 1024];
-        let res = encode(&mut msg, &mut buf[..], MAGIC, &mut crypto);
-        assert_eq!(res.len(), 42);
-        for i in 0..res.len() {
-            assert_eq!(res[i], should[i]);
-        }
-    }
-    let msg2 = decode(&mut should, MAGIC, &mut crypto).unwrap();
-    assert_eq!(msg, msg2);
-}
-
-#[test]
-fn udpmessage_close() {
-    let mut crypto = Crypto::None;
-    let mut msg = Message::Close;
-    let mut should = [118, 112, 110, 1, 0, 0, 0, 3];
-    {
-        let mut buf = [0; 1024];
-        let res = encode(&mut msg, &mut buf[..], MAGIC, &mut crypto);
-        assert_eq!(res.len(), 8);
-        assert_eq!(&res, &should);
-    }
-    let msg2 = decode(&mut should, MAGIC, &mut crypto).unwrap();
-    assert_eq!(msg, msg2);
-}
-
-#[test]
-fn udpmessage_invalid() {
-    let mut crypto = Crypto::None;
-    assert!(decode(&mut [0x76, 0x70, 0x6e, 1, 0, 0, 0, 0], MAGIC, &mut crypto).is_ok());
-    // too short
-    assert!(decode(&mut [], MAGIC, &mut crypto).is_err());
-    // invalid protocol
-    assert!(decode(&mut [0, 1, 2, 0, 0, 0, 0, 0], MAGIC, &mut crypto).is_err());
-    // invalid version
-    assert!(decode(&mut [0x76, 0x70, 0x6e, 0xaa, 0, 0, 0, 0], MAGIC, &mut crypto).is_err());
-    // invalid crypto
-    assert!(decode(&mut [0x76, 0x70, 0x6e, 1, 0xaa, 0, 0, 0], MAGIC, &mut crypto).is_err());
-    // invalid msg type
-    assert!(decode(&mut [0x76, 0x70, 0x6e, 1, 0, 0, 0, 0xaa], MAGIC, &mut crypto).is_err());
-}
-
-#[test]
-fn udpmessage_invalid_crypto() {
-    let mut crypto = Crypto::from_shared_key(CryptoMethod::ChaCha20, "test");
-    // truncated crypto
-    assert!(decode(&mut [0x76, 0x70, 0x6e, 1, 1, 0, 0, 0], MAGIC, &mut crypto).is_err());
-}
-
-#[test]
-fn message_fmt() {
-    assert_eq!(format!("{:?}", Message::Data(&mut [1, 2, 3, 4, 5], 0, 5)), "Data(5 bytes)");
-    assert_eq!(
-        format!(
-            "{:?}",
-            Message::Peers(vec![
-                SocketAddr::from_str("1.2.3.4:123").unwrap(),
-                SocketAddr::from_str("5.6.7.8:12345").unwrap(),
-                SocketAddr::from_str("[0001:0203:0405:0607:0809:0a0b:0c0d:0e0f]:6789").unwrap()
-            ])
-        ),
-        "Peers [1.2.3.4:123, 5.6.7.8:12345, [1:203:405:607:809:a0b:c0d:e0f]:6789]"
-    );
-    assert_eq!(
-        format!(
-            "{:?}",
-            Message::Init(0, [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15], vec![
-                Range {
-                    base: Address { data: [0, 1, 2, 3, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0], len: 4 },
-                    prefix_len: 24
-                },
-                Range {
-                    base: Address { data: [0, 1, 2, 3, 4, 5, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0], len: 6 },
-                    prefix_len: 16
-                }
-            ], 1800)
-        ),
-        "Init(stage=0, node_id=000102030405060708090a0b0c0d0e0f, peer_timeout=1800, [0.1.2.3/24, 00:01:02:03:04:05/16])"
-    );
-    assert_eq!(format!("{:?}", Message::Close), "Close");
-}

src/usage.txt

@@ -1,43 +0,0 @@
-Usage:
-    vpncloud [options] [--config <file>] [-t <type>] [-d <name>] [-l <port>] [-c <addr>...] [-s <subnet>...]
-
-Options:
-    --config <file>                 Read configuration options from the
-                                    specified file.
-    -t <type>, --type <type>        Set the type of network ("tap" or "tun").
-    --device-path <path>            Set the path of the base device.
-    -d <name>, --device <name>      Name of the virtual device.
-    -m <mode>, --mode <mode>        The mode of the VPN ("hub", "switch",
-                                    "router", or "normal").
-    -l <port>, --listen <port>      The port number on which to listen for data.
-    -c <addr>, --connect <addr>     Address of a peer to connect to.
-    -s <subnet>, --subnet <subnet>    The local subnets to use.
-    --magic <hex>                   Override the 4-byte magic header of each
-                                    packet.
-    --network-id <id>               Optional token that identifies the network.
-                                    (DEPRECATED)
-    --shared-key <key>              The shared key to encrypt all traffic.
-    --crypto <method>               The encryption method to use ("aes256", or
-                                    "chacha20").
-    --peer-timeout <secs>           Peer timeout in seconds.
-    --keepalive <secs>              Periodically send message to keep
-                                    connections alive.
-    --dst-timeout <secs>            Switch table entry timeout in seconds.
-    --beacon-store <path|command>   The file or command to store the beacon.
-    --beacon-load <path|command>    The file or command to load the beacon.
-    --beacon-interval <secs>        Beacon store/load interval in seconds.
-    --ifup <command>                A command to setup the network interface.
-    --ifdown <command>              A command to bring down the network
-                                    interface.
-    --pid-file <file>               Store the process id in this file when
-                                    daemonizing.
-    --user <user>                   Run as other user when daemonizing.
-    --group <group>                 Run as other group when daemonizing.
-    --log-file <file>               Print logs also to this file.
-    --stats-file <file>             Print statistics to this file.
-    --no-port-forwarding            Disable automatic port forward.
-    --daemon                        Run the process in the background.
-    -v, --verbose                   Print debug information.
-    -q, --quiet                     Only print errors and warnings.
-    -h, --help                      Display the help.
-    -V, --version                   Print the version and exit.

src/util.rs

@@ -1,38 +1,122 @@
 // VpnCloud - Peer-to-Peer VPN
-// Copyright (C) 2015-2019  Dennis Schwerdel
+// Copyright (C) 2015-2021  Dennis Schwerdel
 // This software is licensed under GPL-3 or newer (see LICENSE.md)
 
+use std::process::Command;
 use std::{
     fmt,
     net::{Ipv4Addr, SocketAddr, ToSocketAddrs, UdpSocket},
-    sync::atomic::{AtomicIsize, Ordering}
+    sync::atomic::{AtomicIsize, Ordering},
 };
 
-use super::types::Error;
+use crate::error::Error;
 
-#[cfg(target_os = "linux")] use libc;
-
-#[cfg(not(target_os = "linux"))] use time;
+#[cfg(not(target_os = "linux"))]
+use time;
 
 use signal::{trap::Trap, Signal};
+use smallvec::SmallVec;
 use std::time::Instant;
 
-
 pub type Duration = u32;
 pub type Time = i64;
 
+#[derive(Clone)]
+pub struct MsgBuffer {
+    space_before: usize,
+    buffer: [u8; 65535],
+    start: usize,
+    end: usize,
+}
+
+impl MsgBuffer {
+    pub fn new(space_before: usize) -> Self {
+        Self { buffer: [0; 65535], space_before, start: space_before, end: space_before }
+    }
+
+    pub fn get_start(&self) -> usize {
+        self.start
+    }
+
+    pub fn set_start(&mut self, start: usize) {
+        self.start = start
+    }
+
+    pub fn prepend_byte(&mut self, byte: u8) {
+        self.start -= 1;
+        self.buffer[self.start] = byte
+    }
+
+    pub fn take_prefix(&mut self) -> u8 {
+        let byte = self.buffer[self.start];
+        self.start += 1;
+        byte
+    }
+
+    pub fn buffer(&mut self) -> &mut [u8] {
+        &mut self.buffer[self.start..]
+    }
+
+    pub fn message(&self) -> &[u8] {
+        &self.buffer[self.start..self.end]
+    }
+
+    pub fn take(&mut self) -> Option<&[u8]> {
+        if self.start != self.end {
+            let end = self.end;
+            self.end = self.start;
+            Some(&self.buffer[self.start..end])
+        } else {
+            None
+        }
+    }
+
+    pub fn message_mut(&mut self) -> &mut [u8] {
+        &mut self.buffer[self.start..self.end]
+    }
+
+    pub fn set_length(&mut self, length: usize) {
+        self.end = self.start + length
+    }
+
+    pub fn clone_from(&mut self, other: &[u8]) {
+        self.set_length(other.len());
+        self.message_mut().clone_from_slice(other);
+    }
+
+    pub fn len(&self) -> usize {
+        self.end - self.start
+    }
+
+    pub fn is_empty(&self) -> bool {
+        self.start == self.end
+    }
+
+    pub fn clear(&mut self) {
+        self.set_start(self.space_before);
+        self.set_length(0)
+    }
+}
 
 const HEX_CHARS: &[u8] = b"0123456789abcdef";
 
 pub fn bytes_to_hex(bytes: &[u8]) -> String {
-    let mut v = Vec::with_capacity(bytes.len() * 2);
+    let mut s = String::with_capacity(bytes.len() * 2);
     for &byte in bytes {
-        v.push(HEX_CHARS[(byte >> 4) as usize]);
-        v.push(HEX_CHARS[(byte & 0xf) as usize]);
+        s.push(HEX_CHARS[(byte >> 4) as usize] as char);
+        s.push(HEX_CHARS[(byte & 0xf) as usize] as char);
     }
-    unsafe { String::from_utf8_unchecked(v) }
+    s
 }
 
+pub fn addr_nice(addr: SocketAddr) -> SocketAddr {
+    if let SocketAddr::V6(v6addr) = addr {
+        if let Some(ip) = v6addr.ip().to_ipv4() {
+            return (ip, addr.port()).into();
+        }
+    }
+    addr
+}
 
 pub struct Encoder;
 
@@ -86,7 +170,6 @@ impl Encoder {
     }
 }
 
-
 macro_rules! fail {
     ($format:expr) => ( {
         use std::process;
@@ -129,19 +212,16 @@ pub fn get_internal_ip() -> Ipv4Addr {
     }
 }
 
-
 #[allow(unknown_lints, clippy::needless_pass_by_value)]
-pub fn resolve<Addr: ToSocketAddrs + fmt::Debug>(addr: Addr) -> Result<Vec<SocketAddr>, Error> {
-    let addrs = addr.to_socket_addrs().map_err(|_| Error::Name(format!("{:?}", addr)))?;
-    // Remove duplicates in addrs (why are there duplicates???)
-    let mut addrs = addrs.collect::<Vec<_>>();
+pub fn resolve<Addr: ToSocketAddrs + fmt::Debug>(addr: Addr) -> Result<SmallVec<[SocketAddr; 4]>, Error> {
+    let mut addrs =
+        addr.to_socket_addrs().map_err(|_| Error::NameUnresolvable(format!("{:?}", addr)))?.collect::<SmallVec<_>>();
     // Try IPv4 first as it usually is faster
-    addrs.sort_by_key(|addr| {
-        match *addr {
-            SocketAddr::V4(_) => 4,
-            SocketAddr::V6(_) => 6
-        }
+    addrs.sort_by_key(|addr| match *addr {
+        SocketAddr::V4(_) => 4,
+        SocketAddr::V6(_) => 6,
     });
+    // Remove duplicates in addrs (why are there duplicates???)
     addrs.dedup();
     Ok(addrs)
 }
@@ -153,7 +233,6 @@ macro_rules! addr {
     }};
 }
 
-
 pub struct Bytes(pub u64);
 
 impl fmt::Display for Bytes {
@@ -162,31 +241,30 @@ impl fmt::Display for Bytes {
         if size >= 512.0 {
             size /= 1024.0;
         } else {
-            return write!(formatter, "{:.0} B", size)
+            return write!(formatter, "{:.0} B", size);
         }
         if size >= 512.0 {
             size /= 1024.0;
         } else {
-            return write!(formatter, "{:.1} KiB", size)
+            return write!(formatter, "{:.1} KiB", size);
         }
         if size >= 512.0 {
             size /= 1024.0;
         } else {
-            return write!(formatter, "{:.1} MiB", size)
+            return write!(formatter, "{:.1} MiB", size);
         }
         if size >= 512.0 {
             size /= 1024.0;
         } else {
-            return write!(formatter, "{:.1} GiB", size)
+            return write!(formatter, "{:.1} GiB", size);
         }
         write!(formatter, "{:.1} TiB", size)
     }
 }
 
-
 pub struct CtrlC {
     dummy_time: Instant,
-    trap: Trap
+    trap: Trap,
 }
 
 impl CtrlC {
@@ -207,7 +285,6 @@ impl Default for CtrlC {
     }
 }
 
-
 pub trait TimeSource: Sync + Copy + Send + 'static {
     fn now() -> Time;
 }
@@ -250,13 +327,12 @@ impl TimeSource for MockTimeSource {
     }
 }
 
-
 /// Helper function that multiplies the base62 data in buf[0..buflen] by 16 and adds m to it
 fn base62_add_mult_16(buf: &mut [u8], mut buflen: usize, m: u8) -> usize {
     let mut d: usize = m as usize;
-    for i in 0..buflen {
-        d += buf[i] as usize * 16;
-        buf[i] = (d % 62) as u8;
+    for item in buf.iter_mut().take(buflen) {
+        d += *item as usize * 16;
+        *item = (d % 62) as u8;
         d /= 62;
     }
     assert!(d < 62);
@@ -270,7 +346,7 @@ fn base62_add_mult_16(buf: &mut [u8], mut buflen: usize, m: u8) -> usize {
 const BASE62: [char; 62] = [
     '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M',
     'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j',
-    'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z'
+    'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z',
 ];
 
 pub fn to_base62(data: &[u8]) -> String {
@@ -293,14 +369,14 @@ pub fn from_base62(data: &str) -> Result<Vec<u8>, char> {
     let mut buf = Vec::with_capacity(data.len() / 2 + data.len() / 4);
     for c in data.chars() {
         let mut val = match c {
-            '0'..='9' => ((c as usize) % ('0' as usize)),
+            '0'..='9' => (c as usize) % ('0' as usize),
             'A'..='Z' => ((c as usize) % ('A' as usize)) + 10,
             'a'..='z' => ((c as usize) % ('a' as usize)) + 36,
-            _ => return Err(c)
+            _ => return Err(c),
         };
-        for i in 0..buf.len() {
-            val += buf[i] as usize * 62;
-            buf[i] = (val % 256) as u8;
+        for item in &mut buf {
+            val += *item as usize * 62;
+            *item = (val % 256) as u8;
             val /= 256;
         }
         if val > 0 {
@@ -311,6 +387,44 @@ pub fn from_base62(data: &str) -> Result<Vec<u8>, char> {
     Ok(buf)
 }
 
+#[derive(Default)]
+pub struct StatsdMsg {
+    entries: Vec<String>,
+    key: Vec<String>,
+}
+
+impl StatsdMsg {
+    pub fn new() -> Self {
+        Default::default()
+    }
+
+    pub fn add<T: fmt::Display>(&mut self, key: &str, val: T, type_: &str) -> &mut Self {
+        self.entries.push(format!("{}.{}:{}|{}", self.key.join("."), key, val, type_));
+        self
+    }
+
+    pub fn with_ns<F: FnOnce(&mut Self)>(&mut self, ns: &str, f: F) -> &mut Self {
+        self.key.push(ns.to_string());
+        f(self);
+        self.key.pop();
+        self
+    }
+
+    pub fn build(&self) -> String {
+        self.entries.join("\n")
+    }
+}
+
+pub fn run_cmd(mut cmd: Command) {
+    match cmd.status() {
+        Ok(status) => {
+            if !status.success() {
+                error!("Command returned error: {:?}", status.code())
+            }
+        }
+        Err(e) => error!("Failed to execute command {:?}: {}", cmd, e),
+    }
+}
 
 #[test]
 fn base62() {

src/wizard.rs

@@ -0,0 +1,509 @@
+use crate::{config::Config, crypto::Crypto, device, types::Mode};
+use dialoguer::{theme::ColorfulTheme, Confirm, Input, MultiSelect, Password, Select};
+use ring::aead;
+use std::{collections::HashMap, fs, io, os::unix::fs::PermissionsExt, path::Path};
+
+const MODE_SIMPLE: usize = 0;
+const MODE_ADVANCED: usize = 1;
+const MODE_EXPERT: usize = 2;
+
+fn str_list(s: String) -> Vec<String> {
+    if s.is_empty() {
+        vec![]
+    } else {
+        s.split(',').map(|k| k.trim().to_string()).collect()
+    }
+}
+
+fn str_opt(s: String) -> Option<String> {
+    if s.is_empty() {
+        None
+    } else {
+        Some(s)
+    }
+}
+
+fn configure_connectivity(config: &mut Config, mode: usize, theme: &ColorfulTheme) -> Result<(), dialoguer::Error> {
+    if mode >= MODE_ADVANCED {
+        config.listen =
+            Input::with_theme(theme).with_prompt("Listen address").default(config.listen.clone()).interact_text()?;
+    }
+    config.peers = str_list(
+        Input::with_theme(theme)
+            .with_prompt("Peer addresses (comma separated)")
+            .default(config.peers.join(","))
+            .interact_text()?,
+    );
+    if mode >= MODE_ADVANCED {
+        config.port_forwarding = Confirm::with_theme(theme)
+            .with_prompt("Enable automatic port forwarding?")
+            .default(config.port_forwarding)
+            .interact()?;
+    }
+    if mode == MODE_EXPERT {
+        config.advertise_addresses = str_list(
+            Input::with_theme(theme)
+                .with_prompt("Advertise addresses (comma separated)")
+                .default(config.advertise_addresses.join(","))
+                .interact_text()?,
+        );
+        config.peer_timeout = Input::with_theme(theme)
+            .with_prompt("Peer timeout (in seconds)")
+            .default(config.peer_timeout)
+            .interact_text()?;
+        let val = Input::with_theme(theme)
+            .with_prompt("Keepalive interval (in seconds, 0 for default)")
+            .default(config.keepalive.unwrap_or_default())
+            .interact_text()?;
+        config.keepalive = if val == 0 { None } else { Some(val) };
+    }
+    Ok(())
+}
+
+fn configure_crypto(config: &mut Config, mode: usize, theme: &ColorfulTheme) -> Result<(), dialoguer::Error> {
+    if (config.crypto.password.is_some() || config.crypto.private_key.is_some())
+        && !Confirm::with_theme(theme).with_prompt("Create new crypto config?").default(false).interact()?
+    {
+        return Ok(());
+    }
+    let mut use_password = true;
+    if mode >= MODE_ADVANCED {
+        use_password = Select::with_theme(theme)
+            .with_prompt("Crypto configuration method")
+            .items(&["Simple (Password)", "Complex (Key pair)"])
+            .default(if config.crypto.private_key.is_some() { 1 } else { 0 })
+            .interact()?
+            == 0
+    }
+    if use_password {
+        config.crypto.password = Some(
+            Password::with_theme(theme)
+                .with_prompt("Password")
+                .with_confirmation("Confirm password", "Passwords do not match")
+                .interact()?,
+        );
+        config.crypto.private_key = None;
+        config.crypto.public_key = None;
+        config.crypto.trusted_keys = vec![];
+    } else {
+        config.crypto.password = None;
+        let (priv_key, pub_key) = match Select::with_theme(theme)
+            .with_prompt("Specify key pair")
+            .items(&["Generate new key pair", "Enter private key", "Generate from password"])
+            .default(0)
+            .interact()?
+        {
+            0 => {
+                let (priv_key, pub_key) = Crypto::generate_keypair(None);
+                info!("Private key: {}", priv_key);
+                info!("Public key: {}", pub_key);
+                (priv_key, pub_key)
+            }
+            1 => {
+                let priv_key = Password::with_theme(theme)
+                    .with_prompt("Private key")
+                    .with_confirmation("Confirm private key", "Keys do not match")
+                    .interact()?;
+                let pub_key = try_fail!(Crypto::public_key_from_private_key(&priv_key), "Invalid private key: {:?}");
+                info!("Public key: {}", pub_key);
+                (priv_key, pub_key)
+            }
+            2 => {
+                let password = Password::with_theme(theme)
+                    .with_prompt("Password")
+                    .with_confirmation("Confirm password", "Passwords do not match")
+                    .interact()?;
+                let (priv_key, pub_key) = Crypto::generate_keypair(Some(&password));
+                info!("Private key: {}", priv_key);
+                info!("Public key: {}", pub_key);
+                (priv_key, pub_key)
+            }
+            _ => unreachable!(),
+        };
+        config.crypto.trusted_keys = str_list(
+            Input::with_theme(theme)
+                .with_prompt("Trusted keys (public keys, comma separated)")
+                .default(pub_key.clone())
+                .interact_text()?,
+        );
+        config.crypto.private_key = Some(priv_key);
+        config.crypto.public_key = Some(pub_key);
+    }
+    if mode == MODE_EXPERT {
+        let (unencrypted, allowed_algos) = Crypto::parse_algorithms(&config.crypto.algorithms)
+            .map_err(|_| io::Error::new(io::ErrorKind::InvalidData, "Invalid crypto algorithms"))?;
+        let algos = MultiSelect::with_theme(theme)
+            .with_prompt("Allowed encryption algorithms (select multiple)")
+            .items_checked(&[
+                ("Unencrypted (dangerous)", unencrypted),
+                ("AES-128 in GCM mode", allowed_algos.contains(&&aead::AES_128_GCM)),
+                ("AES-256 in GCM mode", allowed_algos.contains(&&aead::AES_256_GCM)),
+                ("ChaCha20-Poly1305 (RFC 7539)", allowed_algos.contains(&&aead::CHACHA20_POLY1305)),
+            ])
+            .interact()?;
+        config.crypto.algorithms = vec![];
+        for (id, name) in &[(0, "PLAIN"), (1, "AES128"), (2, "AES256"), (3, "CHACHA20")] {
+            if algos.contains(id) {
+                config.crypto.algorithms.push(name.to_string());
+            }
+        }
+    }
+    Ok(())
+}
+
+fn configure_device(config: &mut Config, mode: usize, theme: &ColorfulTheme) -> Result<(), dialoguer::Error> {
+    if mode >= MODE_ADVANCED {
+        config.device_type = match Select::with_theme(theme)
+            .with_prompt("Device type")
+            .items(&["Tun (IP based)", "Tap (Ethernet based)"])
+            .default(if config.device_type == device::Type::Tun { 0 } else { 1 })
+            .interact()?
+        {
+            0 => device::Type::Tun,
+            1 => device::Type::Tap,
+            _ => unreachable!(),
+        }
+    }
+    if mode == MODE_EXPERT {
+        config.device_name =
+            Input::with_theme(theme).with_prompt("Device name").default(config.device_name.clone()).interact_text()?;
+        config.device_path = str_opt(
+            Input::with_theme(theme)
+                .with_prompt("Device path (empty for default)")
+                .default(config.device_path.as_ref().cloned().unwrap_or_default())
+                .interact_text()?,
+        );
+        config.fix_rp_filter = Confirm::with_theme(theme)
+            .with_prompt("Automatically fix insecure rp_filter settings")
+            .default(config.fix_rp_filter)
+            .interact()?;
+        config.mode = match Select::with_theme(theme)
+            .with_prompt("Operation mode")
+            .items(&["Normal", "Router", "Switch", "Hub"])
+            .default(match config.mode {
+                Mode::Normal => 0,
+                Mode::Router => 1,
+                Mode::Switch => 2,
+                Mode::Hub => 3,
+            })
+            .interact()?
+        {
+            0 => Mode::Normal,
+            1 => Mode::Router,
+            2 => Mode::Switch,
+            3 => Mode::Hub,
+            _ => unreachable!(),
+        };
+        if config.mode == Mode::Switch {
+            config.switch_timeout = Input::with_theme(theme)
+                .with_prompt("Switch timeout (in seconds")
+                .default(config.switch_timeout)
+                .interact_text()?;
+        }
+    }
+    Ok(())
+}
+
+fn configure_addresses(config: &mut Config, mode: usize, theme: &ColorfulTheme) -> Result<(), dialoguer::Error> {
+    config.ip = str_opt(
+        Input::with_theme(theme)
+            .with_prompt("Virtual IP address (e.g. 10.0.0.1, leave empty for none)")
+            .allow_empty(true)
+            .default(config.ip.as_ref().cloned().unwrap_or_default())
+            .interact_text()?,
+    );
+    if config.device_type == device::Type::Tun {
+        if mode >= MODE_ADVANCED {
+            config.auto_claim = Confirm::with_theme(theme)
+                .with_prompt("Automatically claim IP set on virtual interface?")
+                .default(config.auto_claim)
+                .interact()?;
+        }
+        if mode == MODE_EXPERT {
+            config.claims = str_list(
+                Input::with_theme(theme)
+                    .with_prompt("Claim additional addresses (e.g. 10.0.0.0/24, comma separated, leave empty for none)")
+                    .allow_empty(true)
+                    .default(config.claims.join(","))
+                    .interact_text()?,
+            );
+        }
+    } else {
+        config.claims = vec![];
+    }
+    if mode == MODE_EXPERT {
+        config.ifup = str_opt(
+            Input::with_theme(theme)
+                .with_prompt("Interface setup command (leave empty for none)")
+                .allow_empty(true)
+                .default(config.ifup.as_ref().cloned().unwrap_or_default())
+                .interact_text()?,
+        );
+        config.ifdown = str_opt(
+            Input::with_theme(theme)
+                .with_prompt("Interface tear down command (leave empty for none)")
+                .allow_empty(true)
+                .default(config.ifdown.as_ref().cloned().unwrap_or_default())
+                .interact_text()?,
+        );
+    }
+    Ok(())
+}
+
+fn configure_beacon(config: &mut Config, mode: usize, theme: &ColorfulTheme) -> Result<(), dialoguer::Error> {
+    if mode == MODE_EXPERT
+        && Confirm::with_theme(theme)
+            .with_prompt("Configure beacons?")
+            .default(config.beacon_load.is_some() || config.beacon_store.is_some())
+            .interact()?
+    {
+        config.beacon_store = match Select::with_theme(theme)
+            .with_prompt("How to store beacons")
+            .items(&["Do not store beacons", "Store to file", "Execute command"])
+            .default(if let Some(v) = &config.beacon_store {
+                if v.starts_with('|') {
+                    2
+                } else {
+                    1
+                }
+            } else {
+                0
+            })
+            .interact()?
+        {
+            0 => None,
+            1 => Some(
+                Input::with_theme(theme)
+                    .with_prompt("File path")
+                    .default(config.beacon_store.clone().unwrap_or_default())
+                    .interact_text()?,
+            ),
+            2 => Some(format!(
+                "|{}",
+                Input::<String>::with_theme(theme)
+                    .with_prompt("Command")
+                    .default(config.beacon_store.clone().unwrap_or_default().trim_start_matches('|').to_string())
+                    .interact_text()?
+            )),
+            _ => unreachable!(),
+        };
+        config.beacon_load = match Select::with_theme(theme)
+            .with_prompt("How to load beacons")
+            .items(&["Do not load beacons", "Load from file", "Execute command"])
+            .default(if let Some(v) = &config.beacon_load {
+                if v.starts_with('|') {
+                    2
+                } else {
+                    1
+                }
+            } else {
+                0
+            })
+            .interact()?
+        {
+            0 => None,
+            1 => Some(
+                Input::with_theme(theme)
+                    .with_prompt("File path")
+                    .default(config.beacon_load.clone().unwrap_or_default())
+                    .interact_text()?,
+            ),
+            2 => Some(format!(
+                "|{}",
+                Input::<String>::with_theme(theme)
+                    .with_prompt("Command")
+                    .default(config.beacon_load.clone().unwrap_or_default().trim_start_matches('|').to_string())
+                    .interact_text()?
+            )),
+            _ => unreachable!(),
+        };
+        config.beacon_interval = Input::with_theme(theme)
+            .with_prompt("Beacon interval (in seconds)")
+            .default(config.beacon_interval)
+            .interact_text()?;
+        config.beacon_password = str_opt(
+            Password::with_theme(theme)
+                .with_prompt("Beacon password (leave empty for none)")
+                .with_confirmation("Confirm password", "Passwords do not match")
+                .allow_empty_password(true)
+                .interact()?,
+        );
+    }
+    Ok(())
+}
+
+fn configure_stats(config: &mut Config, mode: usize, theme: &ColorfulTheme) -> Result<(), dialoguer::Error> {
+    if mode >= MODE_ADVANCED {
+        config.stats_file = str_opt(
+            Input::with_theme(theme)
+                .with_prompt("Write stats to file (empty to disable)")
+                .default(config.stats_file.clone().unwrap_or_default())
+                .allow_empty(true)
+                .interact_text()?,
+        );
+    }
+    if mode == MODE_EXPERT {
+        if Confirm::with_theme(theme)
+            .with_prompt("Send statistics to statsd server?")
+            .default(config.statsd_server.is_some())
+            .interact()?
+        {
+            config.statsd_server = str_opt(
+                Input::with_theme(theme)
+                    .with_prompt("Statsd server URL")
+                    .default(config.statsd_server.clone().unwrap_or_default())
+                    .allow_empty(true)
+                    .interact_text()?,
+            );
+            config.statsd_prefix = str_opt(
+                Input::with_theme(theme)
+                    .with_prompt("Statsd prefix")
+                    .default(config.statsd_prefix.clone().unwrap_or_default())
+                    .allow_empty(true)
+                    .interact_text()?,
+            );
+        } else {
+            config.statsd_server = None;
+        }
+    }
+    Ok(())
+}
+
+fn configure_process(config: &mut Config, mode: usize, theme: &ColorfulTheme) -> Result<(), dialoguer::Error> {
+    if mode == MODE_EXPERT {
+        config.user = str_opt(
+            Input::with_theme(theme)
+                .with_prompt("Run as different user (empty to disable)")
+                .default(config.user.clone().unwrap_or_default())
+                .allow_empty(true)
+                .interact_text()?,
+        );
+        config.group = str_opt(
+            Input::with_theme(theme)
+                .with_prompt("Run as different group (empty to disable)")
+                .default(config.group.clone().unwrap_or_default())
+                .allow_empty(true)
+                .interact_text()?,
+        );
+        config.pid_file = str_opt(
+            Input::with_theme(theme)
+                .with_prompt("Write process id to file (empty to disable)")
+                .default(config.pid_file.clone().unwrap_or_default())
+                .allow_empty(true)
+                .interact_text()?,
+        );
+    }
+    Ok(())
+}
+
+fn configure_hooks(config: &mut Config, mode: usize, theme: &ColorfulTheme) -> Result<(), dialoguer::Error> {
+    if mode == MODE_EXPERT {
+        if Confirm::with_theme(theme)
+            .with_prompt("Set hooks to react on events?")
+            .default(config.hook.is_some() || !config.hooks.is_empty())
+            .interact()?
+        {
+            config.hook = str_opt(
+                Input::with_theme(theme)
+                    .with_prompt("Command to execute for all events (empty to disable)")
+                    .default(config.hook.clone().unwrap_or_default())
+                    .allow_empty(true)
+                    .interact_text()?,
+            );
+            let mut hooks: HashMap<String, String> = Default::default();
+            for event in &[
+                "peer_connecting",
+                "peer_connected",
+                "peer_disconnected",
+                "device_setup",
+                "device_configured",
+                "vpn_started",
+                "vpn_shutdown",
+            ] {
+                if let Some(cmd) = str_opt(
+                    Input::with_theme(theme)
+                        .with_prompt(format!("Command to execute for event '{}' (empty to disable)", event))
+                        .default(config.hooks.get(*event).cloned().unwrap_or_default())
+                        .allow_empty(true)
+                        .interact_text()?,
+                ) {
+                    hooks.insert(event.to_string(), cmd);
+                }
+            }
+            config.hooks = hooks;
+        } else {
+            config.hook = None;
+            config.hooks = Default::default();
+        }
+    }
+    Ok(())
+}
+
+pub fn configure(name: Option<String>) -> Result<(), dialoguer::Error> {
+    let theme = ColorfulTheme::default();
+
+    let name = if let Some(name) = name {
+        name
+    } else {
+        let mut names = vec![];
+        for file in fs::read_dir("/etc/vpncloud")? {
+            names.push(file?.path().file_stem().unwrap().to_str().unwrap().to_string());
+        }
+        let selection =
+            Select::with_theme(&theme).with_prompt("Which network?").item("New network").items(&names).interact()?;
+        if selection > 0 {
+            names[selection - 1].clone()
+        } else {
+            Input::with_theme(&theme).with_prompt("Network name").interact_text()?
+        }
+    };
+
+    let mut config = Config::default();
+    let file = Path::new("/etc/vpncloud").join(format!("{}.net", name));
+    if file.exists() {
+        let f = fs::File::open(&file)?;
+        let config_file = serde_yaml::from_reader(f)
+            .map_err(|_| io::Error::new(io::ErrorKind::InvalidData, "Failed to parse config file"))?;
+        config.merge_file(config_file);
+    }
+    if file.parent().unwrap().metadata()?.permissions().readonly() {
+        return Err(io::Error::new(io::ErrorKind::PermissionDenied, "Config file not writable").into());
+    }
+
+    loop {
+        let mode = Select::with_theme(&theme)
+            .with_prompt("Configuration mode")
+            .items(&["Simple (minimal options)", "Advanced (some more options)", "Expert (all options)"])
+            .default(MODE_SIMPLE)
+            .interact()?;
+
+        configure_connectivity(&mut config, mode, &theme)?;
+        configure_crypto(&mut config, mode, &theme)?;
+        configure_device(&mut config, mode, &theme)?;
+        configure_addresses(&mut config, mode, &theme)?;
+        configure_beacon(&mut config, mode, &theme)?;
+        configure_stats(&mut config, mode, &theme)?;
+        configure_process(&mut config, mode, &theme)?;
+        configure_hooks(&mut config, mode, &theme)?;
+        if Confirm::with_theme(&theme).with_prompt("Finish configuration?").default(true).interact()? {
+            break;
+        }
+    }
+
+    if Confirm::with_theme(&theme).with_prompt("Save config?").default(true).interact()? {
+        let config_file = config.into_config_file();
+        let f = fs::File::create(&file)?;
+        serde_yaml::to_writer(f, &config_file)
+            .map_err(|_| io::Error::new(io::ErrorKind::InvalidData, "Failed to parse config file"))?;
+        fs::set_permissions(file, fs::Permissions::from_mode(0o600))?;
+        println!();
+        println!("Use the following commands to control your VPN:");
+        println!("  start the VPN:   sudo service vpncloud@{0} start", name);
+        println!("  stop the VPN:    sudo service vpncloud@{0} stop", name);
+        println!("  get the status:  sudo service vpncloud@{0} status", name);
+        println!("  add VPN to autostart:       sudo systemctl enable vpncloud@{0}", name);
+        println!("  remove VPN from autostart:  sudo systemctl disable vpncloud@{0}", name);
+    }
+
+    Ok(())
+}