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use super::constants::*;
use super::router;
use super::timers::{Events, Timers};
use super::HandshakeJob;
use super::bind::Bind;
use super::tun::Tun;
use std::fmt;
use std::ops::Deref;
use std::sync::atomic::{AtomicBool, AtomicU64, Ordering};
use std::sync::Arc;
use std::time::{Instant, SystemTime};
use spin::{Mutex, RwLock, RwLockReadGuard, RwLockWriteGuard};
use crossbeam_channel::Sender;
use x25519_dalek::PublicKey;
pub struct Peer<T: Tun, B: Bind> {
pub router: Arc<router::Peer<B::Endpoint, Events<T, B>, T::Writer, B::Writer>>,
pub state: Arc<PeerInner<B>>,
}
pub struct PeerInner<B: Bind> {
// internal id (for logging)
pub id: u64,
// handshake state
pub walltime_last_handshake: Mutex<SystemTime>,
pub last_handshake_sent: Mutex<Instant>, // instant for last handshake
pub handshake_queued: AtomicBool, // is a handshake job currently queued for the peer?
pub queue: Mutex<Sender<HandshakeJob<B::Endpoint>>>, // handshake queue
// stats and configuration
pub pk: PublicKey, // public key, DISCUSS: avoid this. TODO: remove
pub rx_bytes: AtomicU64, // received bytes
pub tx_bytes: AtomicU64, // transmitted bytes
// timer model
pub timers: RwLock<Timers>,
}
impl<T: Tun, B: Bind> Clone for Peer<T, B> {
fn clone(&self) -> Peer<T, B> {
Peer {
router: self.router.clone(),
state: self.state.clone(),
}
}
}
impl<B: Bind> PeerInner<B> {
#[inline(always)]
pub fn timers(&self) -> RwLockReadGuard<Timers> {
self.timers.read()
}
#[inline(always)]
pub fn timers_mut(&self) -> RwLockWriteGuard<Timers> {
self.timers.write()
}
}
impl<T: Tun, B: Bind> fmt::Display for Peer<T, B> {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
write!(f, "peer(id = {})", self.id)
}
}
impl<T: Tun, B: Bind> Deref for Peer<T, B> {
type Target = PeerInner<B>;
fn deref(&self) -> &Self::Target {
&self.state
}
}
impl<T: Tun, B: Bind> Peer<T, B> {
/// Bring the peer down. Causing:
///
/// - Timers to be stopped and disabled.
/// - All keystate to be zeroed
pub fn down(&self) {
self.stop_timers();
self.router.down();
}
/// Bring the peer up.
pub fn up(&self) {
self.router.up();
self.start_timers();
}
}
impl<B: Bind> PeerInner<B> {
/* Queue a handshake request for the parallel workers
* (if one does not already exist)
*
* The function is ratelimited.
*/
pub fn packet_send_handshake_initiation(&self) {
// the function is rate limited
{
let mut lhs = self.last_handshake_sent.lock();
if lhs.elapsed() < REKEY_TIMEOUT {
return;
}
*lhs = Instant::now();
}
// create a new handshake job for the peer
if !self.handshake_queued.swap(true, Ordering::SeqCst) {
self.queue.lock().send(HandshakeJob::New(self.pk)).unwrap();
}
}
}
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