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use std::collections::HashMap;
use std::net::{Ipv4Addr, Ipv6Addr};
use std::sync::atomic::{AtomicBool, Ordering};
use std::sync::{Arc, Weak};
use std::thread;
use std::time::Instant;
use crossbeam_deque::{Injector, Steal, Stealer, Worker};
use spin;
use treebitmap::IpLookupTable;
use super::super::types::KeyPair;
use super::anti_replay::AntiReplay;
use super::peer;
use super::peer::{Peer, PeerInner};
use super::types::{Callback, KeyCallback, Opaque};
use super::workers::{worker_parallel, JobParallel};
pub struct DeviceInner<T: Opaque, S: Callback<T>, R: Callback<T>, K: KeyCallback<T>> {
// threading and workers
pub running: AtomicBool, // workers running?
pub parked: AtomicBool, // any workers parked?
pub injector: Injector<JobParallel>, // parallel enc/dec task injector
// unboxed callbacks (used for timers and handshake requests)
pub event_send: S, // called when authenticated message send
pub event_recv: R, // called when authenticated message received
pub event_need_key: K, // called when new key material is required
// routing
pub recv: spin::RwLock<HashMap<u32, DecryptionState<T, S, R, K>>>, // receiver id -> decryption state
pub ipv4: spin::RwLock<IpLookupTable<Ipv4Addr, Weak<PeerInner<T, S, R, K>>>>, // ipv4 cryptkey routing
pub ipv6: spin::RwLock<IpLookupTable<Ipv6Addr, Weak<PeerInner<T, S, R, K>>>>, // ipv6 cryptkey routing
}
pub struct EncryptionState {
pub key: [u8; 32], // encryption key
pub id: u32, // sender id
pub nonce: u64, // next available nonce
pub death: Instant, // time when the key no longer can be used for encryption
// (birth + reject-after-time - keepalive-timeout - rekey-timeout)
}
pub struct DecryptionState<T: Opaque, S: Callback<T>, R: Callback<T>, K: KeyCallback<T>> {
pub key: [u8; 32],
pub keypair: Weak<KeyPair>,
pub confirmed: AtomicBool,
pub protector: spin::Mutex<AntiReplay>,
pub peer: Weak<PeerInner<T, S, R, K>>,
pub death: Instant, // time when the key can no longer be used for decryption
}
pub struct Device<T: Opaque, S: Callback<T>, R: Callback<T>, K: KeyCallback<T>>(
Arc<DeviceInner<T, S, R, K>>,
Vec<thread::JoinHandle<()>>,
);
impl<T: Opaque, S: Callback<T>, R: Callback<T>, K: KeyCallback<T>> Drop for Device<T, S, R, K> {
fn drop(&mut self) {
// mark device as stopped
let device = &self.0;
device.running.store(false, Ordering::SeqCst);
// eat all parallel jobs
while match device.injector.steal() {
Steal::Empty => true,
_ => false,
} {}
// unpark all threads
for handle in &self.1 {
handle.thread().unpark();
}
}
}
impl<T: Opaque, S: Callback<T>, R: Callback<T>, K: KeyCallback<T>> Device<T, S, R, K> {
pub fn new(
num_workers: usize,
event_recv: R,
event_send: S,
event_need_key: K,
) -> Device<T, S, R, K> {
// allocate shared device state
let inner = Arc::new(DeviceInner {
event_recv,
event_send,
event_need_key,
parked: AtomicBool::new(false),
running: AtomicBool::new(true),
injector: Injector::new(),
recv: spin::RwLock::new(HashMap::new()),
ipv4: spin::RwLock::new(IpLookupTable::new()),
ipv6: spin::RwLock::new(IpLookupTable::new()),
});
// alloacate work pool resources
let mut workers = Vec::with_capacity(num_workers);
let mut stealers = Vec::with_capacity(num_workers);
for _ in 0..num_workers {
let w = Worker::new_fifo();
stealers.push(w.stealer());
workers.push(w);
}
// start worker threads
let mut threads = Vec::with_capacity(num_workers);
for _ in 0..num_workers {
let device = inner.clone();
let stealers = stealers.clone();
let worker = workers.pop().unwrap();
threads.push(thread::spawn(move || {
worker_parallel(device, worker, stealers)
}));
}
// return exported device handle
Device(inner, threads)
}
/// Adds a new peer to the device
///
/// # Returns
///
/// A atomic ref. counted peer (with liftime matching the device)
pub fn new_peer(&self, opaque: T) -> Peer<T, S, R, K> {
peer::new_peer(self.0.clone(), opaque)
}
/// Cryptkey routes and sends a plaintext message (IP packet)
///
/// # Arguments
///
/// - pt_msg: IP packet to cryptkey route
///
pub fn send(&self, pt_msg: &mut [u8]) {
unimplemented!();
}
/// Receive an encrypted transport message
///
/// # Arguments
///
/// - ct_msg: Encrypted transport message
pub fn recv(&self, ct_msg: &mut [u8]) {
unimplemented!();
}
}
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