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Alex 2023-03-09 10:42:11 +01:00
commit 878414bfb7
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/target

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[package]
name = "wgautomesh"
version = "0.1.0"
edition = "2021"
# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
[dependencies]
xxhash-rust = { version = "0.8", default-features = false, features = ["xxh3"] }
anyhow = "1.0"
log = "0.4"
pretty_env_logger = "0.4.0"
serde = { version = "1.0", features = ["derive"] }
bincode = "1.3"
toml = { version = "0.7", default-features = false, features = ["parse"] }

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all:
RUST_LOG=wgautomesh=debug cargo run -- config.toml

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config.toml Normal file
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interface = "route48"
gossip_port = 1134

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use std::collections::HashMap;
use std::net::{IpAddr, SocketAddr, UdpSocket};
use std::process::Command;
use std::sync::Mutex;
use std::thread;
use std::time::Duration;
use anyhow::{bail, Result};
use log::*;
use serde::{Deserialize, Serialize};
/// Keep at most this many addresses for each peer
const KEEP_MAX_ADDRESSES: usize = 5;
/// Number of peers to gossip with
const GOSSIP_PEERS: usize = 10;
/// Interval at which to try new addresses when disconnected (1 minute)
const TRY_INTERVAL: Duration = Duration::from_secs(60);
/// Time before a peer is considered dead (5 minutes)
const TIMEOUT: Duration = Duration::from_secs(300);
/// Interval at which to gossip last_seen info
const GOSSIP_INTERVAL: Duration = Duration::from_secs(300);
type Pubkey = String;
#[derive(Deserialize)]
struct Config {
/// The Wireguard interface name
interface: Pubkey,
/// The port to use for gossip inside the Wireguard mesh (must be the same on all nodes)
gossip_port: u16,
/// The list of peers we try to connect to
#[serde(default)]
peers: Vec<Peer>,
}
#[derive(Deserialize)]
struct Peer {
/// The peer's Wireguard public key
pubkey: Pubkey,
/// The peer's Wireguard address
address: IpAddr,
/// An optionnal Wireguard endpoint used to initialize a connection to this peer
endpoint: Option<SocketAddr>,
}
fn main() -> Result<()> {
pretty_env_logger::init();
let args: Vec<String> = std::env::args().collect();
let config_path = match args.len() {
0 | 1 => "/etc/wgautomesh.toml",
2 => &args[1],
_ => bail!(
"Usage: {} [path_to_config_file]",
args.get(0).map(String::as_str).unwrap_or("wgautomesh")
),
};
let config: Config = {
let config_str = std::fs::read_to_string(config_path)?;
toml::from_str(&config_str)?
};
Daemon::new(config)?.run()
}
// ============ UTIL =================
fn time() -> u64 {
std::time::SystemTime::now()
.duration_since(std::time::SystemTime::UNIX_EPOCH)
.unwrap()
.as_secs()
}
fn fasthash(data: &[u8]) -> u64 {
use xxhash_rust::xxh3::Xxh3;
let mut h = Xxh3::new();
h.update(data);
h.digest()
}
fn wg_dump(config: &Config) -> Result<(Pubkey, Vec<(Pubkey, Option<SocketAddr>, u64)>)> {
let output = Command::new("sudo")
.args(["wg", "show", &config.interface, "dump"])
.output()?;
let mut lines = std::str::from_utf8(&output.stdout)?.split('\n');
let ourself = lines.next().unwrap().split('\t').collect::<Vec<_>>();
let our_pubkey = ourself[1].to_string();
let peers = lines
.filter_map(|line| {
let fields = line.split('\t').collect::<Vec<_>>();
if fields.len() < 5 {
None
} else {
Some((
fields[0].to_string(),
fields[2].parse::<SocketAddr>().ok(),
fields[4].parse::<u64>().unwrap(),
))
}
})
.collect::<Vec<_>>();
Ok((our_pubkey, peers))
}
// ============ DAEMON CODE =================
struct Daemon {
config: Config,
ourself: Pubkey,
socket: UdpSocket,
state: Mutex<State>,
}
struct PeerInfo {
endpoint: Option<SocketAddr>,
last_seen: u64,
gossip_ip: IpAddr,
gossip_prio: u64,
}
#[derive(Serialize, Deserialize, Debug)]
enum Gossip {
Announce {
pubkey: Pubkey,
endpoints: Vec<(SocketAddr, u64)>,
},
Request,
}
impl Daemon {
fn new(config: Config) -> Result<Self> {
let (ourself, _peers) = wg_dump(&config)?;
let socket = UdpSocket::bind(SocketAddr::new("0.0.0.0".parse()?, config.gossip_port))?;
Ok(Daemon {
config,
ourself,
socket,
state: Mutex::new(State {
peers: HashMap::new(),
gossip: HashMap::new(),
}),
})
}
fn run(&self) -> Result<()> {
let request = bincode::serialize(&Gossip::Request)?;
for peer in self.config.peers.iter() {
let addr = SocketAddr::new(peer.address, self.config.gossip_port);
self.socket.send_to(&request, addr)?;
}
thread::scope(|s| {
s.spawn(|| self.wg_loop());
s.spawn(|| self.recv_loop());
});
unreachable!()
}
fn wg_loop(&self) -> ! {
let mut i = 0;
loop {
if let Err(e) = self.wg_loop_iter(i) {
error!("Wg loop error: {}", e);
}
i = i + 1;
std::thread::sleep(TRY_INTERVAL);
}
}
fn wg_loop_iter(&self, i: usize) -> Result<()> {
let (_, wg_peers) = wg_dump(&self.config)?;
let mut state = self.state.lock().unwrap();
// 1. Update local peers info of peers
for (pk, endpoint, last_seen) in wg_peers {
match state.peers.get_mut(&pk) {
Some(i) => {
i.endpoint = endpoint;
i.last_seen = last_seen;
}
None => {
let gossip_ip = match self.config.peers.iter().find(|x| x.pubkey == pk) {
Some(x) => x.address,
None => continue,
};
let gossip_prio = fasthash(format!("{}-{}", self.ourself, pk).as_bytes());
state.peers.insert(
pk,
PeerInfo {
endpoint,
gossip_prio,
gossip_ip,
last_seen,
},
);
}
}
}
// 2. Send gossip for peers where there is a big update
let announces = state
.peers
.iter()
.filter_map(|(pk, info)| info.endpoint.map(|ip| (pk, ip, info.last_seen)))
.filter(|(pk, ip, last_seen)| {
!state
.gossip
.get(pk.as_str())
.unwrap_or(&vec![])
.iter()
.any(|(a, t)| a == ip && *last_seen > t + GOSSIP_INTERVAL.as_secs())
})
.map(|(pk, ip, last_seen)| (pk.to_string(), vec![(ip, last_seen)]))
.collect::<Vec<_>>();
for (pubkey, endpoints) in announces {
state.handle_announce(self, pubkey, endpoints)?;
}
// 3. Try new address for disconnected peers
let now = time();
for peer in self.config.peers.iter() {
// Skip peer if it is in connected state
if state
.peers
.get(&peer.pubkey)
.map(|x| now < x.last_seen + TIMEOUT.as_secs())
.unwrap_or(false)
{
continue;
}
let mut endpoints = state.gossip.get(&peer.pubkey).cloned().unwrap_or_default();
if endpoints.is_empty() {
if let Some(endpoint) = peer.endpoint {
endpoints.push((endpoint, 0));
}
}
endpoints.sort();
if !endpoints.is_empty() {
let endpoint = endpoints[i % endpoints.len()];
info!("Configure {} with endpoint {}", peer.pubkey, endpoint.0);
Command::new("sudo")
.args([
"wg",
"set",
&self.config.interface,
"peer",
&peer.pubkey,
"endpoint",
&endpoint.0.to_string(),
"persistent-keepalive",
"20",
])
.output()?;
}
}
Ok(())
}
fn recv_loop(&self) -> ! {
loop {
if let Err(e) = self.recv_loop_iter() {
error!("Receive loop error: {}", e);
std::thread::sleep(Duration::from_secs(10));
}
}
}
fn recv_loop_iter(&self) -> Result<()> {
let (from, gossip) = self.recv_gossip()?;
let mut state = self.state.lock().unwrap();
match gossip {
Gossip::Announce { pubkey, endpoints } => {
state.handle_announce(self, pubkey, endpoints)?;
}
Gossip::Request => {
for (pubkey, endpoints) in state.gossip.iter() {
let packet = bincode::serialize(&Gossip::Announce {
pubkey: pubkey.clone(),
endpoints: endpoints.clone(),
})?;
self.socket.send_to(&packet, from)?;
}
}
}
Ok(())
}
fn recv_gossip(&self) -> Result<(SocketAddr, Gossip)> {
let mut buf = vec![0u8; 1500];
let (amt, src) = self.socket.recv_from(&mut buf)?;
if !self.config.peers.iter().any(|x| x.address == src.ip()) {
bail!("Received message from unexpected peer: {}", src);
}
let gossip = bincode::deserialize(&buf[..amt])?;
debug!("RECV {}\t{:?}", src, gossip);
Ok((src, gossip))
}
}
struct State {
peers: HashMap<Pubkey, PeerInfo>,
gossip: HashMap<Pubkey, Vec<(SocketAddr, u64)>>,
}
impl State {
fn send_gossip(&self, daemon: &Daemon, gossip: Gossip) -> Result<()> {
let packet = bincode::serialize(&gossip)?;
let now = time();
let mut peer_vec = self
.peers
.iter()
.filter(|(_, info)| now < info.last_seen + TIMEOUT.as_secs() && info.endpoint.is_some())
.map(|(_, info)| (info.gossip_ip, info.gossip_prio))
.collect::<Vec<_>>();
peer_vec.sort_by_key(|(_, prio)| *prio);
for (gossip_ip, _) in peer_vec.into_iter().take(GOSSIP_PEERS) {
let addr = SocketAddr::new(gossip_ip, daemon.config.gossip_port);
debug!("SEND {}\t{:?}", addr, gossip);
daemon.socket.send_to(&packet, addr)?;
}
Ok(())
}
fn handle_announce(
&mut self,
daemon: &Daemon,
pubkey: Pubkey,
mut endpoints: Vec<(SocketAddr, u64)>,
) -> Result<()> {
let propagate = {
match self.gossip.get_mut(&pubkey) {
Some(existing) => {
let mut has_new = false;
for (new_addr, new_t) in endpoints {
if !existing
.iter()
.any(|(addr, t)| *addr == new_addr && *t >= new_t)
{
existing.retain(|(addr, _)| *addr != new_addr);
existing.push((new_addr, new_t));
has_new = true;
}
}
if has_new {
existing.sort_by_key(|(_, t)| *t);
existing.truncate(KEEP_MAX_ADDRESSES);
Some(Gossip::Announce {
pubkey,
endpoints: existing.clone(),
})
} else {
None
}
}
None => {
endpoints.truncate(KEEP_MAX_ADDRESSES);
self.gossip.insert(pubkey.clone(), endpoints.clone());
Some(Gossip::Announce { pubkey, endpoints })
}
}
};
if let Some(propagate) = propagate {
info!("Propagating announce: {:?}", propagate);
self.send_gossip(daemon, propagate)?;
}
Ok(())
}
}