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vpncloud
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vpncloud/src/cloud.rs

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// 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::{
cmp::{max, min},
collections::HashMap,
fmt,
fs::{self, File},
hash::BuildHasherDefault,
io::{self, Cursor, Seek, SeekFrom, Write},
marker::PhantomData,
net::{SocketAddr, ToSocketAddrs},
path::Path,
str::FromStr,
};
use fnv::FnvHasher;
use rand::{random, seq::SliceRandom, thread_rng};
use smallvec::{smallvec, SmallVec};
use crate::{
beacon::BeaconSerializer,
config::{Config, DEFAULT_PEER_TIMEOUT, DEFAULT_PORT},
crypto::{is_init_message, Crypto, MessageResult, PeerCrypto},
device::{Device, Type},
error::Error,
messages::{
AddrList, NodeInfo, PeerInfo, MESSAGE_TYPE_CLOSE, MESSAGE_TYPE_DATA, MESSAGE_TYPE_KEEPALIVE,
MESSAGE_TYPE_NODE_INFO,
},
net::{mapped_addr, parse_listen, Socket},
payload::Protocol,
poll::{WaitImpl, WaitResult},
port_forwarding::PortForwarding,
table::ClaimTable,
traffic::TrafficStats,
types::{Address, Mode, NodeId, Range, RangeList},
util::{addr_nice, bytes_to_hex, resolve, CtrlC, Duration, MsgBuffer, StatsdMsg, Time, TimeSource},
};
pub type Hash = BuildHasherDefault<FnvHasher>;
const MAX_RECONNECT_INTERVAL: u16 = 3600;
const RESOLVE_INTERVAL: Time = 300;
pub const STATS_INTERVAL: Time = 60;
const OWN_ADDRESS_RESET_INTERVAL: Time = 300;
const SPACE_BEFORE: usize = 100;
struct PeerData {
addrs: AddrList,
#[allow(dead_code)] //TODO: export in status
last_seen: Time,
timeout: Time,
peer_timeout: u16,
node_id: NodeId,
crypto: PeerCrypto<NodeInfo>,
}
#[derive(Clone)]
pub struct ReconnectEntry {
address: Option<(String, Time)>,
resolved: AddrList,
tries: u16,
timeout: u16,
next: Time,
final_timeout: Option<Time>,
}
pub struct GenericCloud<D: Device, P: Protocol, S: Socket, TS: TimeSource> {
node_id: NodeId,
config: Config,
learning: bool,
broadcast: bool,
peers: HashMap<SocketAddr, PeerData, Hash>,
reconnect_peers: SmallVec<[ReconnectEntry; 3]>,
own_addresses: AddrList,
pending_inits: HashMap<SocketAddr, PeerCrypto<NodeInfo>, Hash>,
table: ClaimTable<TS>,
socket: S,
device: D,
claims: RangeList,
crypto: Crypto,
next_peers: Time,
peer_timeout_publish: u16,
update_freq: u16,
stats_file: Option<File>,
statsd_server: Option<String>,
next_housekeep: Time,
next_stats_out: Time,
next_beacon: Time,
next_own_address_reset: Time,
port_forwarding: Option<PortForwarding>,
traffic: TrafficStats,
beacon_serializer: BeaconSerializer<TS>,
_dummy_p: PhantomData<P>,
_dummy_ts: PhantomData<TS>,
}
impl<D: Device, P: Protocol, S: Socket, TS: TimeSource> GenericCloud<D, P, S, TS> {
#[allow(clippy::too_many_arguments)]
pub fn new(
config: &Config, socket: S, device: D, port_forwarding: Option<PortForwarding>, stats_file: Option<File>,
) -> Self {
let (learning, broadcast) = match config.mode {
Mode::Normal => match config.device_type {
Type::Tap => (true, true),
Type::Tun => (false, false),
},
Mode::Router => (false, false),
Mode::Switch => (true, true),
Mode::Hub => (false, true),
};
let mut claims = SmallVec::with_capacity(config.claims.len());
for s in &config.claims {
claims.push(try_fail!(Range::from_str(s), "Invalid subnet format: {} ({})", s));
}
if device.get_type() == Type::Tun && config.auto_claim {
match device.get_ip() {
Ok(ip) => {
let range = Range { base: Address::from_ipv4(ip), prefix_len: 32 };
info!("Auto-claiming {} due to interface address", range);
claims.push(range);
}
Err(Error::DeviceIo(_, e)) if e.kind() == io::ErrorKind::AddrNotAvailable => {
info!("No address set on interface.")
}
Err(e) => error!("{}", e),
}
}
let now = TS::now();
let update_freq = config.get_keepalive() as u16;
let node_id = random();
let crypto = Crypto::new(node_id, &config.crypto).unwrap();
let beacon_key = config.beacon_password.as_ref().map(|s| s.as_bytes()).unwrap_or(&[]);
let mut res = GenericCloud {
node_id,
peers: HashMap::default(),
claims,
learning,
broadcast,
pending_inits: HashMap::default(),
reconnect_peers: SmallVec::new(),
own_addresses: SmallVec::new(),
peer_timeout_publish: config.peer_timeout as u16,
table: ClaimTable::new(config.switch_timeout as Duration, config.peer_timeout as Duration),
socket,
device,
next_peers: now,
update_freq,
stats_file,
statsd_server: config.statsd_server.clone(),
next_housekeep: now,
next_stats_out: now + STATS_INTERVAL,
next_beacon: now,
next_own_address_reset: now + OWN_ADDRESS_RESET_INTERVAL,
port_forwarding,
traffic: TrafficStats::default(),
beacon_serializer: BeaconSerializer::new(beacon_key),
crypto,
config: config.clone(),
_dummy_p: PhantomData,
_dummy_ts: PhantomData,
};
res.initialize();
res
}
#[inline]
pub fn ifname(&self) -> &str {
self.device.ifname()
}
/// Sends the message to all peers
///
/// # Errors
/// Returns an `Error::SocketError` when the underlying system call fails or only part of the
/// message could be sent (can this even happen?).
/// Some messages could have been sent.
#[inline]
fn broadcast_msg(&mut self, type_: u8, msg: &mut MsgBuffer) -> Result<(), Error> {
debug!("Broadcasting message type {}, {:?} bytes to {} peers", type_, msg.len(), self.peers.len());
let mut msg_data = MsgBuffer::new(100);
for (addr, peer) in &mut self.peers {
msg_data.set_start(msg.get_start());
msg_data.set_length(msg.len());
msg_data.message_mut().clone_from_slice(msg.message());
peer.crypto.send_message(type_, &mut msg_data)?;
self.traffic.count_out_traffic(*addr, msg_data.len());
match self.socket.send(msg_data.message(), *addr) {
Ok(written) if written == msg_data.len() => Ok(()),
Ok(_) => Err(Error::Socket("Sent out truncated packet")),
Err(e) => Err(Error::SocketIo("IOError when sending", e)),
}?
}
Ok(())
}
#[inline]
fn send_to(&mut self, addr: SocketAddr, msg: &mut MsgBuffer) -> Result<(), Error> {
// HOT PATH
debug!("Sending msg with {} bytes to {}", msg.len(), addr);
self.traffic.count_out_traffic(addr, msg.len());
match self.socket.send(msg.message(), addr) {
Ok(written) if written == msg.len() => Ok(()),
Ok(_) => Err(Error::Socket("Sent out truncated packet")),
Err(e) => Err(Error::SocketIo("IOError when sending", e)),
}
}
#[inline]
fn send_msg(&mut self, addr: SocketAddr, type_: u8, msg: &mut MsgBuffer) -> Result<(), Error> {
// HOT PATH
debug!("Sending msg with {} bytes to {}", msg.len(), addr);
let peer = match self.peers.get_mut(&addr) {
Some(peer) => peer,
None => return Err(Error::Message("Sending to node that is not a peer")),
};
peer.crypto.send_message(type_, msg)?;
self.send_to(addr, msg)
}
pub fn reset_own_addresses(&mut self) -> io::Result<()> {
self.own_addresses.clear();
let socket_addr = self.socket.address().map(mapped_addr)?;
// 1) Specified advertise addresses
for addr in &self.config.advertise_addresses {
self.own_addresses.push(parse_listen(addr, socket_addr.port()));
}
// 2) Address of UDP socket
self.own_addresses.push(socket_addr);
// 3) Addresses from port forwarding
if let Some(ref pfw) = self.port_forwarding {
self.own_addresses.push(pfw.get_internal_ip().into());
self.own_addresses.push(pfw.get_external_ip().into());
}
debug!("Own addresses: {:?}", self.own_addresses);
// TODO: detect address changes and call event
Ok(())
}
/// Returns the number of peers
#[allow(dead_code)]
pub fn peer_count(&self) -> usize {
self.peers.len()
}
/// Adds a peer to the reconnect list
///
/// This method adds a peer to the list of nodes to reconnect to. A periodic task will try to
/// connect to the peer if it is not already connected.
pub fn add_reconnect_peer(&mut self, add: String) {
let now = TS::now();
let resolved = match resolve(&add as &str) {
Ok(addrs) => addrs,
Err(err) => {
warn!("Failed to resolve {}: {:?}", add, err);
smallvec![]
}
};
self.reconnect_peers.push(ReconnectEntry {
address: Some((add, now)),
tries: 0,
timeout: 1,
resolved,
next: now,
final_timeout: None,
})
}
/// Connects to a node given by its address
///
/// This method connects to node by sending a `Message::Init` to it. If `addr` is a name that
/// resolves to multiple addresses, one message is sent to each of them.
/// If the node is already a connected peer or the address is blacklisted, no message is sent.
///
/// # Errors
/// This method returns `Error::NameError` if the address is a name that fails to resolve.
pub fn connect<Addr: ToSocketAddrs + fmt::Debug + Clone>(&mut self, addr: Addr) -> Result<(), Error> {
let addrs = resolve(&addr)?.into_iter().map(mapped_addr).collect::<SmallVec<[SocketAddr; 3]>>();
for addr in &addrs {
if self.own_addresses.contains(addr)
|| self.peers.contains_key(addr)
|| self.pending_inits.contains_key(addr)
{
return Ok(());
}
}
if !addrs.is_empty() {
self.config.call_hook(
"peer_connecting",
vec![("PEER", format!("{:?}", addr_nice(addrs[0]))), ("IFNAME", self.device.ifname().to_owned())],
true,
);
}
// Send a message to each resolved address
for a in addrs {
// Ignore error this time
self.connect_sock(a).ok();
}
Ok(())
}
fn create_node_info(&self) -> NodeInfo {
let mut peers = smallvec![];
for peer in self.peers.values() {
peers.push(PeerInfo { node_id: Some(peer.node_id), addrs: peer.addrs.clone() })
}
if peers.len() > 20 {
let mut rng = rand::thread_rng();
peers.partial_shuffle(&mut rng, 20);
peers.truncate(20);
}
NodeInfo {
node_id: self.node_id,
peers,
claims: self.claims.clone(),
peer_timeout: Some(self.peer_timeout_publish),
addrs: self.own_addresses.clone(),
}
}
fn connect_sock(&mut self, addr: SocketAddr) -> Result<(), Error> {
let addr = mapped_addr(addr);
if self.peers.contains_key(&addr)
|| self.own_addresses.contains(&addr)
|| self.pending_inits.contains_key(&addr)
{
return Ok(());
}
debug!("Connecting to {:?}", addr);
let payload = self.create_node_info();
let mut peer_crypto = self.crypto.peer_instance(payload);
let mut msg = MsgBuffer::new(SPACE_BEFORE);
peer_crypto.initialize(&mut msg)?;
self.pending_inits.insert(addr, peer_crypto);
self.send_to(addr, &mut msg)
}
fn crypto_housekeep(&mut self) -> Result<(), Error> {
let mut msg = MsgBuffer::new(SPACE_BEFORE);
let mut del: SmallVec<[SocketAddr; 4]> = smallvec![];
for addr in self.pending_inits.keys().copied().collect::<SmallVec<[SocketAddr; 4]>>() {
msg.clear();
match self.pending_inits.get_mut(&addr).unwrap().every_second(&mut msg) {
Err(_) => del.push(addr),
Ok(MessageResult::None) => (),
Ok(MessageResult::Reply) => self.send_to(addr, &mut msg)?,
Ok(_) => unreachable!(),
}
}
for addr in self.peers.keys().copied().collect::<SmallVec<[SocketAddr; 16]>>() {
msg.clear();
match self.peers.get_mut(&addr).unwrap().crypto.every_second(&mut msg) {
Err(_) => del.push(addr),
Ok(MessageResult::None) => (),
Ok(MessageResult::Reply) => self.send_to(addr, &mut msg)?,
Ok(_) => unreachable!(),
}
}
for addr in del {
self.pending_inits.remove(&addr);
if self.peers.remove(&addr).is_some() {
self.connect_sock(addr)?;
}
}
Ok(())
}
fn reconnect_to_peers(&mut self) -> Result<(), Error> {
let now = TS::now();
// Connect to those reconnect_peers that are due
for entry in self.reconnect_peers.clone() {
if entry.next > now {
continue;
}
self.connect(&entry.resolved as &[SocketAddr])?;
}
for entry in &mut self.reconnect_peers {
// Schedule for next second if node is connected
for addr in &entry.resolved {
if self.peers.contains_key(addr) {
entry.tries = 0;
entry.timeout = 1;
entry.next = now + 1;
continue;
}
}
// Resolve entries anew
if let Some((ref address, ref mut next_resolve)) = entry.address {
if *next_resolve <= now {
match resolve(address as &str) {
Ok(addrs) => entry.resolved = addrs,
Err(_) => match resolve(&format!("{}:{}", address, DEFAULT_PORT)) {
Ok(addrs) => entry.resolved = addrs,
Err(err) => warn!("Failed to resolve {}: {}", address, err),
},
}
*next_resolve = now + RESOLVE_INTERVAL;
}
}
// Ignore if next attempt is already in the future
if entry.next > now {
continue;
}
// Exponential back-off: every 10 tries, the interval doubles
entry.tries += 1;
if entry.tries > 10 {
entry.tries = 0;
entry.timeout *= 2;
}
// Maximum interval is one hour
if entry.timeout > MAX_RECONNECT_INTERVAL {
entry.timeout = MAX_RECONNECT_INTERVAL;
}
// Schedule next connection attempt
entry.next = now + Time::from(entry.timeout);
}
self.reconnect_peers.retain(|e| e.final_timeout.unwrap_or(now) >= now);
Ok(())
}
fn housekeep(&mut self) -> Result<(), Error> {
let now = TS::now();
let mut buffer = MsgBuffer::new(SPACE_BEFORE);
let mut del: SmallVec<[SocketAddr; 3]> = SmallVec::new();
for (&addr, data) in &self.peers {
if data.timeout < now {
del.push(addr);
}
}
for addr in del {
info!("Forgot peer {} due to timeout", addr_nice(addr));
self.peers.remove(&addr);
self.table.remove_claims(addr);
self.connect_sock(addr)?; // Try to reconnect
}
self.table.housekeep();
self.crypto_housekeep()?;
// Periodically extend the port-forwarding
if let Some(ref mut pfw) = self.port_forwarding {
pfw.check_extend();
}
let now = TS::now();
// Periodically send peer list to peers
if self.next_peers <= now {
debug!("Send peer list to all peers");
let info = self.create_node_info();
info.encode(&mut buffer);
self.broadcast_msg(MESSAGE_TYPE_NODE_INFO, &mut buffer)?;
// Reschedule for next update
let min_peer_timeout = self.peers.iter().map(|p| p.1.peer_timeout).min().unwrap_or(DEFAULT_PEER_TIMEOUT);
let interval = min(self.update_freq, max(min_peer_timeout / 2 - 60, 1));
self.next_peers = now + Time::from(interval);
}
self.reconnect_to_peers()?;
if self.next_stats_out < now {
// Write out the statistics
self.write_out_stats().map_err(|err| Error::FileIo("Failed to write stats file", err))?;
self.send_stats_to_statsd()?;
self.next_stats_out = now + STATS_INTERVAL;
self.traffic.period(Some(5));
}
if let Some(peers) = self.beacon_serializer.get_cmd_results() {
debug!("Loaded beacon with peers: {:?}", peers);
for peer in peers {
self.connect_sock(peer)?;
}
}
if self.next_beacon < now {
self.store_beacon()?;
self.load_beacon()?;
self.next_beacon = now + Time::from(self.config.beacon_interval);
}
// Periodically reset own peers
if self.next_own_address_reset <= now {
self.reset_own_addresses().map_err(|err| Error::SocketIo("Failed to get own addresses", err))?;
self.next_own_address_reset = now + OWN_ADDRESS_RESET_INTERVAL;
}
Ok(())
}
/// Stores the beacon
fn store_beacon(&mut self) -> Result<(), Error> {
if let Some(ref path) = self.config.beacon_store {
let peers: SmallVec<[SocketAddr; 3]> =
self.own_addresses.choose_multiple(&mut thread_rng(), 3).cloned().collect();
if let Some(path) = path.strip_prefix('|') {
self.beacon_serializer
.write_to_cmd(&peers, path)
.map_err(|e| Error::BeaconIo("Failed to call beacon command", e))?;
} else {
self.beacon_serializer
.write_to_file(&peers, path)
.map_err(|e| Error::BeaconIo("Failed to write beacon to file", e))?;
}
}
Ok(())
}
/// Loads the beacon
fn load_beacon(&mut self) -> Result<(), Error> {
let peers;
if let Some(ref path) = self.config.beacon_load {
if let Some(path) = path.strip_prefix('|') {
self.beacon_serializer
.read_from_cmd(path, Some(50))
.map_err(|e| Error::BeaconIo("Failed to call beacon command", e))?;
return Ok(());
} else {
peers = self
.beacon_serializer
.read_from_file(path, Some(50))
.map_err(|e| Error::BeaconIo("Failed to read beacon from file", e))?;
}
} else {
return Ok(());
}
debug!("Loaded beacon with peers: {:?}", peers);
for peer in peers {
self.connect_sock(peer)?;
}
Ok(())
}
/// Writes out the statistics to a file
fn write_out_stats(&mut self) -> Result<(), io::Error> {
if let Some(ref mut f) = self.stats_file {
debug!("Writing out stats");
f.seek(SeekFrom::Start(0))?;
f.set_len(0)?;
writeln!(f, "peers:")?;
let now = TS::now();
for (addr, data) in &self.peers {
writeln!(
f,
" - \"{}\": {{ ttl_secs: {}, crypto: {} }}",
addr_nice(*addr),
data.timeout - now,
data.crypto.algorithm_name()
)?;
}
writeln!(f)?;
self.table.write_out(f)?;
writeln!(f)?;
self.traffic.write_out(f)?;
writeln!(f)?;
}
Ok(())
}
/// Sends the statistics to a statsd endpoint
fn send_stats_to_statsd(&mut self) -> Result<(), Error> {
if let Some(ref endpoint) = self.statsd_server {
let peer_traffic = self.traffic.total_peer_traffic();
let payload_traffic = self.traffic.total_payload_traffic();
let dropped = &self.traffic.dropped;
let prefix = self.config.statsd_prefix.as_ref().map(|s| s as &str).unwrap_or("vpncloud");
let msg = StatsdMsg::new()
.with_ns(prefix, |msg| {
msg.add("peer_count", self.peers.len(), "g");
msg.add("table_cache_entries", self.table.cache_len(), "g");
msg.add("table_claims", self.table.claim_len(), "g");
msg.with_ns("traffic", |msg| {
msg.with_ns("protocol", |msg| {
msg.with_ns("inbound", |msg| {
msg.add("bytes", peer_traffic.in_bytes, "c");
msg.add("packets", peer_traffic.in_packets, "c");
});
msg.with_ns("outbound", |msg| {
msg.add("bytes", peer_traffic.out_bytes, "c");
msg.add("packets", peer_traffic.out_packets, "c");
});
});
msg.with_ns("payload", |msg| {
msg.with_ns("inbound", |msg| {
msg.add("bytes", payload_traffic.in_bytes, "c");
msg.add("packets", payload_traffic.in_packets, "c");
});
msg.with_ns("outbound", |msg| {
msg.add("bytes", payload_traffic.out_bytes, "c");
msg.add("packets", payload_traffic.out_packets, "c");
});
});
});
msg.with_ns("invalid_protocol_traffic", |msg| {
msg.add("bytes", dropped.in_bytes, "c");
msg.add("packets", dropped.in_packets, "c");
});
msg.with_ns("dropped_payload", |msg| {
msg.add("bytes", dropped.out_bytes, "c");
msg.add("packets", dropped.out_packets, "c");
});
})
.build();
let msg_data = msg.as_bytes();
let addrs = resolve(endpoint)?;
if let Some(addr) = addrs.first() {
match self.socket.send(msg_data, *addr) {
Ok(written) if written == msg_data.len() => Ok(()),
Ok(_) => Err(Error::Socket("Sent out truncated packet")),
Err(e) => Err(Error::SocketIo("IOError when sending", e)),
}?
} else {
error!("Failed to resolve statsd server {}", endpoint);
}
}
Ok(())
}
pub fn handle_interface_data(&mut self, data: &mut MsgBuffer) -> Result<(), Error> {
// HOT PATH
let (src, dst) = P::parse(data.message())?;
debug!("Read data from interface: src: {}, dst: {}, {} bytes", src, dst, data.len());
self.traffic.count_out_payload(dst, src, data.len());
match self.table.lookup(dst) {
Some(addr) => {
// HOT PATH
// Peer found for destination
debug!("Found destination for {} => {}", dst, addr);
self.send_msg(addr, MESSAGE_TYPE_DATA, data)?;
if !self.peers.contains_key(&addr) {
// COLD PATH
// If the peer is not actually connected, remove the entry in the table and try
// to reconnect.
warn!("Destination for {} not found in peers: {}", dst, addr_nice(addr));
self.table.remove_claims(addr);
self.connect_sock(addr)?;
}
}
None => {
// COLD PATH
if self.broadcast {
debug!("No destination for {} found, broadcasting", dst);
self.broadcast_msg(MESSAGE_TYPE_DATA, data)?;
} else {
debug!("No destination for {} found, dropping", dst);
self.traffic.count_dropped_payload(data.len());
}
}
}
Ok(())
}
fn add_new_peer(&mut self, addr: SocketAddr, info: NodeInfo) -> Result<(), Error> {
info!("Added peer {}", addr_nice(addr));
self.config.call_hook(
"peer_connected",
vec![
("PEER", format!("{:?}", addr_nice(addr))),
("IFNAME", self.device.ifname().to_owned()),
("CLAIMS", info.claims.iter().map(|r| format!("{:?}", r)).collect::<Vec<String>>().join(" ")),
("NODE_ID", bytes_to_hex(&info.node_id)),
],
true,
);
if let Some(init) = self.pending_inits.remove(&addr) {
self.peers.insert(
addr,
PeerData {
addrs: info.addrs.clone(),
crypto: init,
node_id: info.node_id,
peer_timeout: info.peer_timeout.unwrap_or(DEFAULT_PEER_TIMEOUT),
last_seen: TS::now(),
timeout: TS::now() + self.config.peer_timeout as Time,
},
);
self.update_peer_info(addr, Some(info))?;
} else {
error!("No init for new peer {}", addr_nice(addr));
}
Ok(())
}
fn remove_peer(&mut self, addr: SocketAddr) {
if let Some(peer) = self.peers.remove(&addr) {
info!("Closing connection to {}", addr_nice(addr));
self.table.remove_claims(addr);
self.config.call_hook(
"peer_disconnected",
vec![
("PEER", format!("{:?}", addr)),
("IFNAME", self.device.ifname().to_owned()),
("NODE_ID", bytes_to_hex(&peer.node_id)),
],
true,
);
}
}
fn connect_to_peers(&mut self, peers: &[PeerInfo]) -> Result<(), Error> {
'outer: for peer in peers {
for addr in &peer.addrs {
if self.peers.contains_key(addr) {
continue 'outer;
}
}
if let Some(node_id) = peer.node_id {
if self.node_id == node_id {
// Check addresses and add addresses that we don't know to own addresses
for addr in &peer.addrs {
if !self.own_addresses.contains(addr) {
self.own_addresses.push(*addr)
}
}
continue 'outer;
}
for p in self.peers.values() {
if p.node_id == node_id {
continue 'outer;
}
}
}
self.connect(&peer.addrs as &[SocketAddr])?;
}
Ok(())
}
fn update_peer_info(&mut self, addr: SocketAddr, info: Option<NodeInfo>) -> Result<(), Error> {
if let Some(peer) = self.peers.get_mut(&addr) {
peer.last_seen = TS::now();
peer.timeout = TS::now() + self.config.peer_timeout as Time;
if let Some(info) = &info {
// Update peer addresses, always add seen address
peer.addrs.clear();
peer.addrs.push(addr);
for addr in &info.addrs {
if !peer.addrs.contains(addr) {
peer.addrs.push(*addr);
}
}
}
} else {
error!("Received peer update from non peer {}", addr_nice(addr));
return Ok(());
}
if let Some(info) = info {
debug!("Adding claims of peer {}: {:?}", addr_nice(addr), info.claims);
self.table.set_claims(addr, info.claims);
debug!("Received {} peers from {}: {:?}", info.peers.len(), addr_nice(addr), info.peers);
self.connect_to_peers(&info.peers)?;
}
Ok(())
}
fn handle_payload_from(&mut self, peer: SocketAddr, data: &mut MsgBuffer) -> Result<(), Error> {
// HOT PATH
let (src, dst) = P::parse(data.message())?;
let len = data.len();
debug!("Writing data to device: {} bytes", len);
self.traffic.count_in_payload(src, dst, len);
if let Err(e) = self.device.write(data) {
error!("Failed to send via device: {}", e);
return Err(e);
}
if self.learning {
// Learn single address
self.table.cache(src, peer);
}
Ok(())
}
fn handle_message(
&mut self, src: SocketAddr, msg_result: MessageResult<NodeInfo>, data: &mut MsgBuffer,
) -> Result<(), Error> {
// HOT PATH
match msg_result {
MessageResult::Message(type_) => {
// HOT PATH
match type_ {
MESSAGE_TYPE_DATA => {
// HOT PATH
self.handle_payload_from(src, data)?
}
MESSAGE_TYPE_NODE_INFO => {
// COLD PATH
let info = match NodeInfo::decode(Cursor::new(data.message())) {
Ok(val) => val,
Err(err) => {
self.traffic.count_invalid_protocol(data.len());
return Err(err);
}
};
self.update_peer_info(src, Some(info))?
}
MESSAGE_TYPE_KEEPALIVE => {
// COLD PATH
self.update_peer_info(src, None)?
}
MESSAGE_TYPE_CLOSE => {
// COLD PATH
self.remove_peer(src)
}
_ => {
// COLD PATH
self.traffic.count_invalid_protocol(data.len());
return Err(Error::Message("Unknown message type"));
}
}
}
MessageResult::Initialized(info) => {
// COLD PATH
self.add_new_peer(src, info)?
}
MessageResult::InitializedWithReply(info) => {
// COLD PATH
self.add_new_peer(src, info)?;
self.send_to(src, data)?
}
MessageResult::Reply => {
// COLD PATH
self.send_to(src, data)?
}
MessageResult::None => {
// COLD PATH
}
}
Ok(())
}
pub fn handle_net_message(&mut self, src: SocketAddr, data: &mut MsgBuffer) -> Result<(), Error> {
// HOT PATH
let src = mapped_addr(src);
debug!("Received {} bytes from {}", data.len(), src);
let msg_result = if let Some(init) = self.pending_inits.get_mut(&src) {
// COLD PATH
init.handle_message(data)
} else if is_init_message(data.message()) {
// COLD PATH
let mut result = None;
if let Some(peer) = self.peers.get_mut(&src) {
if peer.crypto.has_init() {
result = Some(peer.crypto.handle_message(data))
}
}
if let Some(result) = result {
result
} else {
let mut init = self.crypto.peer_instance(self.create_node_info());
let msg_result = init.handle_message(data);
match msg_result {
Ok(res) => {
self.config.call_hook(
"peer_connecting",
vec![
("PEER", format!("{:?}", addr_nice(src))),
("IFNAME", self.device.ifname().to_owned()),
],
true,
);
self.pending_inits.insert(src, init);
Ok(res)
}
Err(err) => {
self.traffic.count_invalid_protocol(data.len());
return Err(err);
}
}
}
} else if let Some(peer) = self.peers.get_mut(&src) {
// HOT PATH
peer.crypto.handle_message(data)
} else {
// COLD PATH
info!("Ignoring non-init message from unknown peer {}", addr_nice(src));
self.traffic.count_invalid_protocol(data.len());
return Ok(());
};
// HOT PATH
match msg_result {
Ok(val) => {
// HOT PATH
self.handle_message(src, val, data)
}
Err(err) => {
// COLD PATH
self.traffic.count_invalid_protocol(data.len());
Err(err)
}
}
}
fn initialize(&mut self) {
if let Err(err) = self.reset_own_addresses() {
error!("Failed to obtain local addresses: {}", err)
}
}
fn handle_socket_event(&mut self, buffer: &mut MsgBuffer) {
// HOT PATH
let src = try_fail!(self.socket.receive(buffer), "Failed to read from network socket: {}");
self.traffic.count_in_traffic(src, buffer.len());
match self.handle_net_message(src, buffer) {
Err(e @ Error::CryptoInitFatal(_)) => {
// COLD PATH
debug!("Fatal crypto init error from {}: {}", src, e);
info!("Closing pending connection to {} due to error in crypto init", addr_nice(src));
self.pending_inits.remove(&src);
self.config.call_hook(
"peer_disconnected",
vec![("PEER", format!("{:?}", addr_nice(src))), ("IFNAME", self.device.ifname().to_owned())],
true,
);
}
Err(e @ Error::CryptoInit(_)) => {
// COLD PATH
debug!("Recoverable init error from {}: {}", src, e);
info!("Ignoring invalid init message from peer {}", addr_nice(src));
}
Err(e) => {
// COLD PATH
error!("{}", e);
}
Ok(_) => {} // HOT PATH
}
}
fn handle_device_event(&mut self, buffer: &mut MsgBuffer) {
// HOT PATH
try_fail!(self.device.read(buffer), "Failed to read from device: {}");
if let Err(e) = self.handle_interface_data(buffer) {
error!("{}", e);
}
}
/// The main method of the node
///
/// This method will use epoll to wait in the sockets and the device at the same time.
/// It will read from the sockets, decode and decrypt the message and then call the
/// `handle_net_message` method. It will also read from the device and call
/// `handle_interface_data` for each packet read.
/// Also, this method will call `housekeep` every second.
pub fn run(&mut self) {
let ctrlc = CtrlC::new();
let waiter = try_fail!(
WaitImpl::new(self.socket.as_raw_fd(), self.device.as_raw_fd(), 1000),
"Failed to setup poll: {}"
);
let mut buffer = MsgBuffer::new(SPACE_BEFORE);
let mut poll_error = false;
self.config.call_hook("vpn_started", vec![("IFNAME", self.device.ifname())], true);
for evt in waiter {
// HOT PATH
match evt {
WaitResult::Error(err) => {
// COLD PATH
if poll_error {
fail!("Poll wait failed again: {}", err);
}
debug!("Poll wait failed: {}, retrying...", err);
poll_error = true;
}
WaitResult::Timeout => {}
WaitResult::Socket => self.handle_socket_event(&mut buffer),
WaitResult::Device => self.handle_device_event(&mut buffer),
}
if self.next_housekeep < TS::now() {
// COLD PATH
poll_error = false;
if ctrlc.was_pressed() {
break;
}
if let Err(e) = self.housekeep() {
error!("{}", e)
}
self.next_housekeep = TS::now() + 1
}
}
info!("Shutting down...");
self.config.call_hook("vpn_shutdown", vec![("IFNAME", self.device.ifname())], true);
buffer.clear();
self.broadcast_msg(MESSAGE_TYPE_CLOSE, &mut buffer).ok();
if let Some(ref path) = self.config.beacon_store {
let path = Path::new(path);
if path.exists() {
info!("Removing beacon file");
if let Err(e) = fs::remove_file(path) {
error!("Failed to remove beacon file: {}", e)
}
}
}
}
}
#[cfg(test)]
use super::device::MockDevice;
#[cfg(test)]
use super::net::MockSocket;
#[cfg(test)]
use super::util::MockTimeSource;
#[cfg(test)]
impl<P: Protocol> GenericCloud<MockDevice, P, MockSocket, MockTimeSource> {
pub fn socket(&mut self) -> &mut MockSocket {
&mut self.socket
}
pub fn device(&mut self) -> &mut MockDevice {
&mut self.device
}
pub fn trigger_socket_event(&mut self) {
let mut buffer = MsgBuffer::new(SPACE_BEFORE);
self.handle_socket_event(&mut buffer);
}
pub fn trigger_device_event(&mut self) {
let mut buffer = MsgBuffer::new(SPACE_BEFORE);
self.handle_device_event(&mut buffer);
}
pub fn trigger_housekeep(&mut self) {
assert!(self.housekeep().is_ok())
}
pub fn is_connected(&self, addr: &SocketAddr) -> bool {
self.peers.contains_key(addr)
}
pub fn own_addresses(&self) -> &[SocketAddr] {
&self.own_addresses
}
pub fn get_num(&self) -> usize {
self.socket.address().unwrap().port() as usize
}
}
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