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|
// This provides a mock tunnel interface.
// Which enables unit tests where WireGuard interfaces
// are configured to match each other and a full test of:
//
// - Handshake
// - Transport encryption/decryption
//
// Can be executed.
use super::*;
use std::cmp::min;
use std::error::Error;
use std::fmt;
use std::sync::mpsc::{sync_channel, Receiver, SyncSender};
use std::sync::Mutex;
use std::thread;
use std::time::Duration;
use hex;
use log::debug;
use rand::rngs::OsRng;
use rand::Rng;
pub struct TunTest {}
// Represents the "other end" (kernel/OS end) of the TUN connection:
//
// Used to send/receive packets to the mock WireGuard interface.
pub struct TunFakeIO {
id: u32,
store: bool,
tx: SyncSender<Vec<u8>>,
rx: Receiver<Vec<u8>>,
}
pub struct TunReader {
id: u32,
rx: Receiver<Vec<u8>>,
}
pub struct TunWriter {
id: u32,
store: bool,
tx: Mutex<SyncSender<Vec<u8>>>,
}
impl fmt::Display for TunFakeIO {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
write!(f, "FakeIO({})", self.id)
}
}
impl fmt::Display for TunReader {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
write!(f, "TunReader({})", self.id)
}
}
impl fmt::Display for TunWriter {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
write!(f, "TunWriter({})", self.id)
}
}
pub struct TunStatus {
first: bool,
}
impl Error for TunError {
fn description(&self) -> &str {
"Generic Tun Error"
}
fn source(&self) -> Option<&(dyn Error + 'static)> {
None
}
}
impl fmt::Display for TunError {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
write!(f, "Not Possible")
}
}
impl Reader for TunReader {
type Error = TunError;
fn read(&self, buf: &mut [u8], offset: usize) -> Result<usize, Self::Error> {
match self.rx.recv() {
Ok(msg) => {
let n = min(buf.len() - offset, msg.len());
buf[offset..offset + n].copy_from_slice(&msg[..n]);
debug!(
"dummy::TUN({}) : read ({}, {})",
self.id,
n,
hex::encode(&buf[offset..offset + n])
);
Ok(n)
}
Err(_) => Err(TunError::Disconnected),
}
}
}
impl Writer for TunWriter {
type Error = TunError;
fn write(&self, src: &[u8]) -> Result<(), Self::Error> {
debug!(
"dummy::TUN({}) : write ({}, {})",
self.id,
src.len(),
hex::encode(src)
);
if self.store {
let m = src.to_owned();
match self.tx.lock().unwrap().send(m) {
Ok(_) => Ok(()),
Err(_) => Err(TunError::Disconnected),
}
} else {
Ok(())
}
}
}
impl Status for TunStatus {
type Error = TunError;
fn event(&mut self) -> Result<TunEvent, Self::Error> {
if self.first {
self.first = false;
return Ok(TunEvent::Up(1420));
}
loop {
thread::sleep(Duration::from_secs(60 * 60));
}
}
}
impl Tun for TunTest {
type Writer = TunWriter;
type Reader = TunReader;
type Error = TunError;
}
impl TunFakeIO {
pub fn write(&self, msg: Vec<u8>) {
if self.store {
self.tx.send(msg).unwrap();
}
}
pub fn read(&self) -> Vec<u8> {
self.rx.recv().unwrap()
}
}
impl TunTest {
pub fn create(store: bool) -> (TunFakeIO, TunReader, TunWriter, TunStatus) {
let (tx1, rx1) = if store {
sync_channel(32)
} else {
sync_channel(1)
};
let (tx2, rx2) = if store {
sync_channel(32)
} else {
sync_channel(1)
};
let id: u32 = OsRng.gen();
let fake = TunFakeIO {
id,
tx: tx1,
rx: rx2,
store,
};
let reader = TunReader { id, rx: rx1 };
let writer = TunWriter {
id,
tx: Mutex::new(tx2),
store,
};
let status = TunStatus { first: true };
(fake, reader, writer, status)
}
}
impl PlatformTun for TunTest {
type Status = TunStatus;
fn create(_name: &str) -> Result<(Vec<Self::Reader>, Self::Writer, Self::Status), Self::Error> {
Err(TunError::Disconnected)
}
}
|
