vpncloud/src/main.rs

328 lines
10 KiB
Rust

// VpnCloud - Peer-to-Peer VPN
// Copyright (C) 2015-2019 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_derive;
#[cfg(test)] extern crate tempfile;
#[cfg(feature = "bench")] extern crate test;
#[macro_use]
pub mod util;
#[cfg(test)]
#[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 net;
pub mod poll;
pub mod port_forwarding;
pub mod traffic;
pub mod types;
pub mod udpmessage;
use docopt::Docopt;
use std::{
fs::File,
io::{self, Write},
net::UdpSocket,
path::Path,
process::Command,
str::FromStr,
sync::Mutex
};
use crate::{
cloud::GenericCloud,
config::Config,
crypto::{Crypto, CryptoMethod},
device::{Device, TunTapDevice, Type},
ethernet::SwitchTable,
ip::RoutingTable,
port_forwarding::PortForwarding,
types::{Error, HeaderMagic, Mode, Protocol, Range},
util::{Duration, 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>
}
struct DualLogger {
file: Mutex<Option<File>>
}
impl DualLogger {
pub fn new<P: AsRef<Path>>(path: Option<P>) -> Result<Self, io::Error> {
if let Some(path) = path {
let file = File::create(path)?;
Ok(DualLogger { file: Mutex::new(Some(file)) })
} else {
Ok(DualLogger { file: Mutex::new(None) })
}
}
}
impl log::Log for DualLogger {
#[inline]
fn enabled(&self, _metadata: &log::Metadata) -> bool {
true
}
#[inline]
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");
writeln!(file, "{} - {} - {}", time, record.level(), record.args())
.expect("Failed to write to logfile");
}
}
}
#[inline]
fn flush(&self) {
let mut file = self.file.lock().expect("Lock poisoned");
if let Some(ref mut file) = *file {
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);
debug!("Running script: {:?}", cmd);
match cmd.status() {
Ok(status) => {
if !status.success() {
error!("Script returned with error: {:?}", status.code())
}
}
Err(e) => error!("Failed to execute script {:?}: {}", script, e)
}
}
enum AnyTable {
Switch(SwitchTable<SystemTimeSource>),
Routing(RoutingTable)
}
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) {
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 {}: {}",
config.device_type,
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));
}
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)))
}
}
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 {
try_fail!(cloud.connect(&addr as &str), "Failed to send message to {}: {}", &addr);
cloud.add_reconnect_peer(addr);
}
if config.daemonize {
info!("Running process as daemon");
let mut daemonize = daemonize::Daemonize::new();
if let Some(user) = config.user {
daemonize = daemonize.user(&user as &str);
}
if let Some(group) = config.group {
daemonize = daemonize.group(&group as &str);
}
if let Some(pid_file) = config.pid_file {
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 {
run_script(&script, cloud.ifname());
}
}
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 logger = try_fail!(DualLogger::new(args.flag_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 {
log::LevelFilter::Debug
} else if args.flag_quiet {
log::LevelFilter::Error
} else {
log::LevelFilter::Info
});
let mut config = Config::default();
if let Some(ref file) = args.flag_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: {:?}");
config.merge_file(config_file)
}
config.merge_args(args);
debug!("Config: {:?}", config);
match config.device_type {
Type::Tap => run::<ethernet::Frame>(config),
Type::Tun => run::<ip::Packet>(config),
Type::Dummy => run::<ethernet::Frame>(config)
}
}