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|
use crate::handshake;
use crate::router;
use crate::types::{Bind, Endpoint, Tun};
use std::sync::atomic::{AtomicUsize, Ordering};
use std::sync::Arc;
use std::thread;
use std::time::{Duration, Instant};
use log::debug;
use rand::rngs::OsRng;
use byteorder::{ByteOrder, LittleEndian};
use crossbeam_channel::bounded;
use x25519_dalek::StaticSecret;
const SIZE_HANDSHAKE_QUEUE: usize = 128;
const THRESHOLD_UNDER_LOAD: usize = SIZE_HANDSHAKE_QUEUE / 4;
const DURATION_UNDER_LOAD: Duration = Duration::from_millis(10_000);
#[derive(Clone)]
pub struct Peer<T: Tun, B: Bind>(Arc<PeerInner<T, B>>);
pub struct PeerInner<T: Tun, B: Bind> {
peer: router::Peer<Events, T, B>,
timers: Timers,
}
pub struct Timers {}
pub struct Events();
impl router::Callbacks for Events {
type Opaque = Timers;
fn send(t: &Timers, size: usize, data: bool, sent: bool) {}
fn recv(t: &Timers, size: usize, data: bool, sent: bool) {}
fn need_key(t: &Timers) {}
}
pub struct Wireguard<T: Tun, B: Bind> {
router: Arc<router::Device<Events, T, B>>,
handshake: Option<Arc<handshake::Device<()>>>,
}
impl<T: Tun, B: Bind> Wireguard<T, B> {
fn start(&self) {}
fn new(tun: T, bind: B, sk: StaticSecret) -> Wireguard<T, B> {
let router = Arc::new(router::Device::new(
num_cpus::get(),
tun.clone(),
bind.clone(),
));
let handshake_staged = Arc::new(AtomicUsize::new(0));
let handshake_device: Arc<handshake::Device<Peer<T, B>>> =
Arc::new(handshake::Device::new(sk));
// start UDP read IO thread
let (handshake_tx, handshake_rx) = bounded(128);
{
let tun = tun.clone();
let bind = bind.clone();
thread::spawn(move || {
let mut under_load =
Instant::now() - DURATION_UNDER_LOAD - Duration::from_millis(1000);
loop {
// read UDP packet into vector
let size = tun.mtu() + 148; // maximum message size
let mut msg: Vec<u8> =
Vec::with_capacity(size + router::CAPACITY_MESSAGE_POSTFIX);
msg.resize(size, 0);
let (size, src) = bind.recv(&mut msg).unwrap(); // TODO handle error
msg.truncate(size);
// message type de-multiplexer
if msg.len() < std::mem::size_of::<u32>() {
continue;
}
match LittleEndian::read_u32(&msg[..]) {
handshake::TYPE_COOKIE_REPLY
| handshake::TYPE_INITIATION
| handshake::TYPE_RESPONSE => {
// detect if under load
if handshake_staged.fetch_add(1, Ordering::SeqCst)
> THRESHOLD_UNDER_LOAD
{
under_load = Instant::now()
}
// pass source address along if under load
handshake_tx
.send((msg, src, under_load.elapsed() < DURATION_UNDER_LOAD))
.unwrap();
}
router::TYPE_TRANSPORT => {
// transport message
}
_ => (),
}
}
});
}
// start handshake workers
for _ in 0..num_cpus::get() {
let bind = bind.clone();
let handshake_rx = handshake_rx.clone();
let handshake_device = handshake_device.clone();
thread::spawn(move || {
// prepare OsRng instance for this thread
let mut rng = OsRng::new().unwrap();
// process elements from the handshake queue
for (msg, src, under_load) in handshake_rx {
// feed message to handshake device
let src_validate = (&src).into_address(); // TODO avoid
match handshake_device.process(
&mut rng,
&msg[..],
if under_load {
Some(&src_validate)
} else {
None
},
) {
Ok((identity, msg, keypair)) => {
// send response
if let Some(msg) = msg {
let _ = bind.send(&msg[..], &src).map_err(|e| {
debug!(
"handshake worker, failed to send response, error = {:?}",
e
)
});
}
// update timers
if let Some(identity) = identity {
// add keypair to peer and free any unused ids
if let Some(keypair) = keypair {
for id in identity.0.peer.add_keypair(keypair) {
handshake_device.release(id);
}
}
}
}
Err(e) => debug!("handshake worker, error = {:?}", e),
}
}
});
}
// start TUN read IO thread
thread::spawn(move || {});
Wireguard {
router,
handshake: None,
}
}
}
|
