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|
use std::marker::PhantomData;
use std::sync::atomic::{AtomicBool, AtomicUsize, Ordering};
use std::sync::Arc;
use std::time::Duration;
use log::info;
use hjul::{Runner, Timer};
use crate::constants::*;
use crate::router::Callbacks;
use crate::types::{bind, tun};
use crate::wireguard::{Peer, PeerInner};
pub struct Timers {
handshake_pending: AtomicBool,
handshake_attempts: AtomicUsize,
retransmit_handshake: Timer,
send_keepalive: Timer,
send_persistent_keepalive: Timer,
zero_key_material: Timer,
new_handshake: Timer,
need_another_keepalive: AtomicBool,
}
impl Timers {
#[inline(always)]
fn need_another_keepalive(&self) -> bool {
self.need_another_keepalive.swap(false, Ordering::SeqCst)
}
}
impl Timers {
pub fn new<T, B>(runner: &Runner, peer: Peer<T, B>) -> Timers
where
T: tun::Tun,
B: bind::Bind,
{
// create a timer instance for the provided peer
Timers {
need_another_keepalive: AtomicBool::new(false),
handshake_pending: AtomicBool::new(false),
handshake_attempts: AtomicUsize::new(0),
retransmit_handshake: {
let peer = peer.clone();
runner.timer(move || {
if peer.timers().handshake_retry() {
info!("Retransmit handshake for {}", peer);
peer.new_handshake();
} else {
info!("Failed to complete handshake for {}", peer);
peer.router.purge_staged_packets();
peer.timers().send_keepalive.stop();
peer.timers().zero_key_material.start(REJECT_AFTER_TIME * 3);
}
})
},
send_keepalive: {
let peer = peer.clone();
runner.timer(move || {
peer.router.send_keepalive();
if peer.timers().need_another_keepalive() {
peer.timers().send_keepalive.start(KEEPALIVE_TIMEOUT);
}
})
},
new_handshake: {
let peer = peer.clone();
runner.timer(move || {
info!(
"Retrying handshake with {}, because we stopped hearing back after {} seconds",
peer,
(KEEPALIVE_TIMEOUT + REKEY_TIMEOUT).as_secs()
);
peer.new_handshake();
peer.timers.read().handshake_begun();
})
},
zero_key_material: {
let peer = peer.clone();
runner.timer(move || {
peer.router.zero_keys();
})
},
send_persistent_keepalive: {
let peer = peer.clone();
runner.timer(move || {
let keepalive = peer.state.keepalive.load(Ordering::Acquire);
if keepalive > 0 {
peer.router.send_keepalive();
peer.timers().send_keepalive.stop();
peer.timers().send_persistent_keepalive.start(Duration::from_secs(keepalive as u64));
}
})
}
}
}
fn handshake_begun(&self) {
self.handshake_pending.store(true, Ordering::SeqCst);
self.handshake_attempts.store(0, Ordering::SeqCst);
self.retransmit_handshake.reset(REKEY_TIMEOUT);
}
fn handshake_retry(&self) -> bool {
if self.handshake_attempts.fetch_add(1, Ordering::SeqCst) <= MAX_TIMER_HANDSHAKES {
self.retransmit_handshake.reset(REKEY_TIMEOUT);
true
} else {
self.handshake_pending.store(false, Ordering::SeqCst);
false
}
}
pub fn updated_persistent_keepalive(&self, keepalive: usize) {
if keepalive > 0 {
self.send_persistent_keepalive.reset(Duration::from_secs(keepalive as u64));
}
}
pub fn dummy(runner: &Runner) -> Timers {
Timers {
handshake_pending: AtomicBool::new(false),
handshake_attempts: AtomicUsize::new(0),
retransmit_handshake: runner.timer(|| {}),
new_handshake: runner.timer(|| {}),
send_keepalive: runner.timer(|| {}),
send_persistent_keepalive: runner.timer(|| {}),
zero_key_material: runner.timer(|| {}),
need_another_keepalive: AtomicBool::new(false),
}
}
pub fn handshake_sent(&self) {
self.send_keepalive.stop();
}
pub fn any_authenticatec_packet_recieved(&self) {
}
pub fn handshake_initiated(&self) {
}
pub fn handhsake_complete(&self) {
}
}
/* Instance of the router callbacks */
pub struct Events<T, B>(PhantomData<(T, B)>);
impl<T: tun::Tun, B: bind::Bind> Callbacks for Events<T, B> {
type Opaque = Arc<PeerInner<B>>;
fn send(peer: &Self::Opaque, size: usize, data: bool, sent: bool) {
peer.tx_bytes.fetch_add(size as u64, Ordering::Relaxed);
}
fn recv(peer: &Self::Opaque, size: usize, data: bool, sent: bool) {
peer.rx_bytes.fetch_add(size as u64, Ordering::Relaxed);
}
fn need_key(peer: &Self::Opaque) {
let timers = peer.timers.read();
if !timers.handshake_pending.swap(true, Ordering::SeqCst) {
timers.handshake_attempts.store(0, Ordering::SeqCst);
timers.new_handshake.fire();
}
}
fn key_confirmed(peer: &Self::Opaque) {
let timers = peer.timers.read();
timers.retransmit_handshake.stop();
}
}
|
