vpncloud/src/cloud.rs

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// VpnCloud - Peer-to-Peer VPN
// Copyright (C) 2015-2016 Dennis Schwerdel
// This software is licensed under GPL-3 or newer (see LICENSE.md)
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use std::net::{SocketAddr, ToSocketAddrs};
use std::collections::{HashMap, HashSet};
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use std::net::UdpSocket;
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use std::io::Result as IoResult;
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use std::fmt;
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use std::os::unix::io::AsRawFd;
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use std::marker::PhantomData;
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use std::hash::BuildHasherDefault;
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use fnv::FnvHasher;
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use epoll;
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use nix::sys::signal::{SIGTERM, SIGQUIT, SIGINT};
use signal::trap::Trap;
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use time::SteadyTime;
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use rand::{random, sample, thread_rng};
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use net2::UdpBuilder;
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use super::types::{Table, Protocol, Range, Error, NetworkId, NodeId};
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use super::device::Device;
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use super::udpmessage::{encode, decode, Options, Message};
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use super::crypto::Crypto;
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use super::util::{now, Time, Duration};
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type Hash = BuildHasherDefault<FnvHasher>;
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struct PeerList {
timeout: Duration,
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peers: HashMap<SocketAddr, (Time, NodeId, Vec<SocketAddr>), Hash>,
nodes: HashMap<NodeId, SocketAddr, Hash>,
addresses: HashSet<SocketAddr, Hash>
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}
impl PeerList {
fn new(timeout: Duration) -> PeerList {
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PeerList{
peers: HashMap::default(),
timeout: timeout,
nodes: HashMap::default(),
addresses: HashSet::default()
}
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}
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fn timeout(&mut self) -> Vec<SocketAddr> {
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let now = now();
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let mut del: Vec<SocketAddr> = Vec::new();
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for (&addr, &(timeout, _nodeid, ref _alt_addrs)) in &self.peers {
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if timeout < now {
del.push(addr);
}
}
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for addr in &del {
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debug!("Forgot peer: {}", addr);
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if let Some((_timeout, nodeid, alt_addrs)) = self.peers.remove(addr) {
self.nodes.remove(&nodeid);
self.addresses.remove(addr);
for addr in &alt_addrs {
self.addresses.remove(addr);
}
}
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}
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del
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}
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#[inline(always)]
fn contains_addr(&self, addr: &SocketAddr) -> bool {
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self.addresses.contains(addr)
}
#[inline]
fn is_connected<Addr: ToSocketAddrs+fmt::Display>(&self, addr: Addr) -> Result<bool, Error> {
let mut addrs = try!(addr.to_socket_addrs().map_err(|_| Error::SocketError("Error looking up name")));
while let Some(a) = addrs.next() {
if self.contains_addr(&a) {
return Ok(true);
}
}
Ok(false)
}
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#[inline(always)]
fn contains_node(&self, node_id: &NodeId) -> bool {
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self.nodes.contains_key(node_id)
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}
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#[inline]
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fn add(&mut self, node_id: NodeId, addr: SocketAddr) {
if self.nodes.insert(node_id, addr).is_none() {
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info!("New peer: {}", addr);
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self.peers.insert(addr, (now()+self.timeout as Time, node_id, vec![]));
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self.addresses.insert(addr);
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}
}
#[inline]
fn add_alt_addr(&mut self, node_id: NodeId, addr: SocketAddr) {
if let Some(main_addr) = self.nodes.get(&node_id) {
if let Some(&mut (_timeout, _node_id, ref mut alt_addrs)) = self.peers.get_mut(main_addr) {
alt_addrs.push(addr);
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self.addresses.insert(addr);
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} else {
error!("Main address for node is not connected");
}
} else {
error!("Node not connected");
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}
}
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#[inline]
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fn as_vec(&self) -> Vec<SocketAddr> {
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self.addresses.iter().map(|addr| *addr).collect()
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}
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#[inline(always)]
fn len(&self) -> usize {
self.peers.len()
}
#[inline]
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fn subset(&self, size: usize) -> Vec<SocketAddr> {
sample(&mut thread_rng(), self.as_vec(), size)
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}
#[inline]
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fn remove(&mut self, addr: &SocketAddr) {
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if let Some((_timeout, node_id, alt_addrs)) = self.peers.remove(&addr) {
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info!("Removed peer: {}", addr);
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self.nodes.remove(&node_id);
self.addresses.remove(addr);
for addr in alt_addrs {
self.addresses.remove(&addr);
}
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}
}
}
#[derive(Clone)]
pub struct ReconnectEntry {
address: String,
tries: u16,
timeout: u16,
next: Time
}
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pub struct GenericCloud<P: Protocol> {
node_id: NodeId,
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peers: PeerList,
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addresses: Vec<Range>,
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learning: bool,
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broadcast: bool,
reconnect_peers: Vec<ReconnectEntry>,
blacklist_peers: Vec<SocketAddr>,
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table: Box<Table>,
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socket4: UdpSocket,
socket6: UdpSocket,
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device: Device,
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options: Options,
crypto: Crypto,
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next_peerlist: Time,
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update_freq: Duration,
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buffer_out: [u8; 64*1024],
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next_housekeep: Time,
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_dummy_p: PhantomData<P>,
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}
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impl<P: Protocol> GenericCloud<P> {
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pub fn new(device: Device, listen: u16, network_id: Option<NetworkId>, table: Box<Table>,
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peer_timeout: Duration, learning: bool, broadcast: bool, addresses: Vec<Range>,
crypto: Crypto) -> Self {
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let socket4 = match UdpBuilder::new_v4().expect("Failed to obtain ipv4 socket builder")
.reuse_address(true).expect("Failed to set so_reuseaddr").bind(("0.0.0.0", listen)) {
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Ok(socket) => socket,
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Err(err) => fail!("Failed to open ipv4 address 0.0.0.0:{}: {}", listen, err)
};
let socket6 = match UdpBuilder::new_v6().expect("Failed to obtain ipv6 socket builder")
.only_v6(true).expect("Failed to set only_v6")
.reuse_address(true).expect("Failed to set so_reuseaddr").bind(("::", listen)) {
Ok(socket) => socket,
Err(err) => fail!("Failed to open ipv6 address ::{}: {}", listen, err)
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};
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let mut options = Options::default();
options.network_id = network_id;
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GenericCloud{
node_id: random(),
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peers: PeerList::new(peer_timeout),
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addresses: addresses,
learning: learning,
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broadcast: broadcast,
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reconnect_peers: Vec::new(),
blacklist_peers: Vec::new(),
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table: table,
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socket4: socket4,
socket6: socket6,
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device: device,
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options: options,
crypto: crypto,
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next_peerlist: now(),
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update_freq: peer_timeout/2,
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buffer_out: [0; 64*1024],
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next_housekeep: now(),
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_dummy_p: PhantomData,
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}
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}
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#[inline]
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pub fn ifname(&self) -> &str {
self.device.ifname()
}
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#[inline]
fn broadcast_msg(&mut self, msg: &mut Message) -> Result<(), Error> {
debug!("Broadcasting {:?}", msg);
let msg_data = encode(&mut self.options, msg, &mut self.buffer_out, &mut self.crypto);
for addr in &self.peers.as_vec() {
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let socket = match addr {
&SocketAddr::V4(_) => &self.socket4,
&SocketAddr::V6(_) => &self.socket6
};
try!(match socket.send_to(msg_data, addr) {
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Ok(written) if written == msg_data.len() => Ok(()),
Ok(_) => Err(Error::SocketError("Sent out truncated packet")),
Err(e) => {
error!("Failed to send via network {:?}", e);
Err(Error::SocketError("IOError when sending"))
}
})
}
Ok(())
}
#[inline]
fn send_msg(&mut self, addr: SocketAddr, msg: &mut Message) -> Result<(), Error> {
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debug!("Sending {:?} to {}", msg, addr);
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let msg_data = encode(&mut self.options, msg, &mut self.buffer_out, &mut self.crypto);
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let socket = match &addr {
&SocketAddr::V4(_) => &self.socket4,
&SocketAddr::V6(_) => &self.socket6
};
match socket.send_to(msg_data, addr) {
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Ok(written) if written == msg_data.len() => Ok(()),
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Ok(_) => Err(Error::SocketError("Sent out truncated packet")),
Err(e) => {
error!("Failed to send via network {:?}", e);
Err(Error::SocketError("IOError when sending"))
}
}
}
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#[allow(dead_code)]
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pub fn address(&self) -> IoResult<(SocketAddr, SocketAddr)> {
Ok((try!(self.socket4.local_addr()), try!(self.socket6.local_addr())))
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}
#[allow(dead_code)]
pub fn peer_count(&self) -> usize {
self.peers.len()
}
pub fn add_reconnect_peer(&mut self, add: String) {
self.reconnect_peers.push(ReconnectEntry {
address: add,
tries: 0,
timeout: 1,
next: now()
})
}
fn is_blacklisted<Addr: ToSocketAddrs+fmt::Display>(&self, addr: Addr) -> Result<bool, Error> {
let mut addrs = try!(addr.to_socket_addrs().map_err(|_| Error::SocketError("Error looking up name")));
while let Some(a) = addrs.next() {
if self.blacklist_peers.contains(&a) {
return Ok(true);
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}
}
Ok(false)
}
pub fn connect<Addr: ToSocketAddrs+fmt::Display+Clone>(&mut self, addr: Addr) -> Result<(), Error> {
if try!(self.peers.is_connected(addr.clone())) || try!(self.is_blacklisted(addr.clone())) {
return Ok(())
}
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debug!("Connecting to {}", addr);
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let subnets = self.addresses.clone();
let node_id = self.node_id.clone();
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let mut msg = Message::Init(0, node_id, subnets);
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if let Ok(addrs) = addr.to_socket_addrs() {
let mut addrs = addrs.collect::<Vec<_>>();
addrs.dedup();
for a in addrs {
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//Ignore error this time
self.send_msg(a, &mut msg).ok();
}
}
Ok(())
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}
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fn housekeep(&mut self) -> Result<(), Error> {
self.peers.timeout();
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self.table.housekeep();
let now = now();
if self.next_peerlist <= now {
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debug!("Send peer list to all peers");
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let mut peer_num = self.peers.len();
if peer_num > 10 {
peer_num = (peer_num as f32).sqrt().ceil() as usize;
if peer_num < 10 {
peer_num = 10;
}
if peer_num > 255 {
peer_num = 255
}
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}
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let peers = self.peers.subset(peer_num);
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let mut msg = Message::Peers(peers);
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try!(self.broadcast_msg(&mut msg));
self.next_peerlist = now + self.update_freq as Time;
}
for entry in self.reconnect_peers.clone() {
if entry.next > now {
continue
}
try!(self.connect(&entry.address as &str));
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}
for entry in &mut self.reconnect_peers {
if try!(self.peers.is_connected(&entry.address as &str)) {
entry.tries = 0;
entry.timeout = 1;
entry.next = now + 1;
continue
}
if entry.next > now {
continue
}
entry.tries += 1;
if entry.tries > 10 {
entry.tries = 0;
entry.timeout *= 2;
}
if entry.timeout > 3600 {
entry.timeout = 3600;
}
entry.next = now + entry.timeout as Time;
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}
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Ok(())
}
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pub fn handle_interface_data(&mut self, payload: &mut [u8], start: usize, end: usize) -> Result<(), Error> {
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let (src, dst) = try!(P::parse(&payload[start..end]));
debug!("Read data from interface: src: {}, dst: {}, {} bytes", src, dst, end-start);
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match self.table.lookup(&dst) {
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Some(addr) => {
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debug!("Found destination for {} => {}", dst, addr);
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if self.peers.contains_addr(&addr) {
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try!(self.send_msg(addr, &mut Message::Data(payload, start, end)))
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} else {
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warn!("Destination for {} not found in peers: {}", dst, addr);
self.table.remove(&dst);
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}
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},
None => {
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if !self.broadcast {
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debug!("No destination for {} found, dropping", dst);
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return Ok(());
}
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debug!("No destination for {} found, broadcasting", dst);
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let mut msg = Message::Data(payload, start, end);
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try!(self.broadcast_msg(&mut msg));
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}
}
Ok(())
}
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pub fn handle_net_message(&mut self, peer: SocketAddr, options: Options, msg: Message) -> Result<(), Error> {
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if self.options.network_id != options.network_id {
info!("Ignoring message from {} with wrong token {:?}", peer, options.network_id);
return Err(Error::WrongNetwork(options.network_id));
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}
debug!("Received {:?} from {}", msg, peer);
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match msg {
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Message::Data(payload, start, end) => {
let (src, _dst) = try!(P::parse(&payload[start..end]));
debug!("Writing data to device: {} bytes", end-start);
match self.device.write(&payload[start..end]) {
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Ok(()) => (),
Err(e) => {
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error!("Failed to send via device: {}", e);
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return Err(Error::TunTapDevError("Failed to write to device"));
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}
}
// not adding peer to increase performance
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if self.learning {
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//learn single address
self.table.learn(src, None, peer);
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}
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},
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Message::Peers(peers) => {
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for p in &peers {
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if ! self.peers.contains_addr(p) && ! self.blacklist_peers.contains(p) {
try!(self.connect(p));
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}
}
},
Message::Init(stage, node_id, ranges) => {
if node_id == self.node_id {
self.blacklist_peers.push(peer);
return Ok(())
}
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if self.peers.contains_node(&node_id) {
self.peers.add_alt_addr(node_id, peer);
} else {
self.peers.add(node_id, peer);
for range in ranges {
self.table.learn(range.base, Some(range.prefix_len), peer.clone());
}
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}
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if stage == 0 {
let peers = self.peers.as_vec();
let own_addrs = self.addresses.clone();
let own_node_id = self.node_id.clone();
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try!(self.send_msg(peer, &mut Message::Init(stage+1, own_node_id, own_addrs)));
try!(self.send_msg(peer, &mut Message::Peers(peers)));
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}
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},
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Message::Close => {
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self.peers.remove(&peer);
self.table.remove_all(&peer);
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}
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}
Ok(())
}
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pub fn run(&mut self) {
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let dummy_time = SteadyTime::now();
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let trap = Trap::trap(&[SIGINT, SIGTERM, SIGQUIT]);
let epoll_handle = try_fail!(epoll::create1(0), "Failed to create epoll handle: {}");
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let socket4_fd = self.socket4.as_raw_fd();
let socket6_fd = self.socket6.as_raw_fd();
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let device_fd = self.device.as_raw_fd();
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let mut socket4_event = epoll::EpollEvent{events: epoll::util::event_type::EPOLLIN, data: 0};
let mut socket6_event = epoll::EpollEvent{events: epoll::util::event_type::EPOLLIN, data: 1};
let mut device_event = epoll::EpollEvent{events: epoll::util::event_type::EPOLLIN, data: 2};
try_fail!(epoll::ctl(epoll_handle, epoll::util::ctl_op::ADD, socket4_fd, &mut socket4_event), "Failed to add ipv4 socket to epoll handle: {}");
try_fail!(epoll::ctl(epoll_handle, epoll::util::ctl_op::ADD, socket6_fd, &mut socket6_event), "Failed to add ipv6 socket to epoll handle: {}");
try_fail!(epoll::ctl(epoll_handle, epoll::util::ctl_op::ADD, device_fd, &mut device_event), "Failed to add device to epoll handle: {}");
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let mut events = [epoll::EpollEvent{events: 0, data: 0}; 2];
let mut buffer = [0; 64*1024];
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loop {
let count = try_fail!(epoll::wait(epoll_handle, &mut events, 1000), "Epoll wait failed: {}") as usize;
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// Process events
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for i in 0..count {
match &events[i].data {
&0 => {
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let (size, src) = try_fail!(self.socket4.recv_from(&mut buffer), "Failed to read from ipv4 network socket: {}");
match decode(&mut buffer[..size], &mut self.crypto).and_then(|(options, msg)| self.handle_net_message(src, options, msg)) {
Ok(_) => (),
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Err(e) => error!("Error: {}, from: {}", e, src)
}
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},
&1 => {
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let (size, src) = try_fail!(self.socket6.recv_from(&mut buffer), "Failed to read from ipv6 network socket: {}");
match decode(&mut buffer[..size], &mut self.crypto).and_then(|(options, msg)| self.handle_net_message(src, options, msg)) {
Ok(_) => (),
Err(e) => error!("Error: {}, from: {}", e, src)
}
},
&2 => {
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let start = 64;
let size = try_fail!(self.device.read(&mut buffer[start..]), "Failed to read from tap device: {}");
match self.handle_interface_data(&mut buffer, start, start+size) {
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Ok(_) => (),
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Err(e) => error!("Error: {}", e)
}
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},
_ => unreachable!()
}
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}
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if self.next_housekeep < now() {
// Check for signals
if trap.wait(dummy_time).is_some() {
break;
}
// Do the housekeeping
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match self.housekeep() {
Ok(_) => (),
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Err(e) => error!("Error: {}", e)
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}
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self.next_housekeep = now() + 1
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}
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}
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info!("Shutting down...");
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self.broadcast_msg(&mut Message::Close).ok();
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}
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}