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|
use std::cmp::min;
use std::error::Error;
use std::fmt;
use std::sync::atomic::{AtomicUsize, Ordering};
use std::sync::mpsc::{sync_channel, Receiver, SyncSender};
use std::sync::Arc;
use std::sync::Mutex;
use super::super::tun::*;
/* This submodule provides pure/dummy implementations of the IO interfaces
* for use in unit tests thoughout the project.
*/
/* Error implementation */
#[derive(Debug)]
pub enum BindError {
Disconnected,
}
impl Error for BindError {
fn description(&self) -> &str {
"Generic Bind Error"
}
fn source(&self) -> Option<&(dyn Error + 'static)> {
None
}
}
impl fmt::Display for BindError {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
match self {
BindError::Disconnected => write!(f, "PairBind disconnected"),
}
}
}
#[derive(Debug)]
pub enum TunError {
Disconnected,
}
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")
}
}
pub struct TunTest {}
pub struct TunFakeIO {
store: bool,
tx: SyncSender<Vec<u8>>,
rx: Receiver<Vec<u8>>,
}
pub struct TunReader {
rx: Receiver<Vec<u8>>,
}
pub struct TunWriter {
store: bool,
tx: Mutex<SyncSender<Vec<u8>>>,
}
#[derive(Clone)]
pub struct TunMTU {
mtu: Arc<AtomicUsize>,
}
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]);
Ok(n)
}
Err(_) => Err(TunError::Disconnected),
}
}
}
impl Writer for TunWriter {
type Error = TunError;
fn write(&self, src: &[u8]) -> Result<(), Self::Error> {
if self.store {
let m = src.to_owned();
match self.tx.lock().unwrap().send(m) {
Ok(_) => Ok(()),
Err(_) => Err(TunError::Disconnected),
}
} else {
Ok(())
}
}
}
impl MTU for TunMTU {
fn mtu(&self) -> usize {
self.mtu.load(Ordering::Acquire)
}
}
impl Tun for TunTest {
type Writer = TunWriter;
type Reader = TunReader;
type MTU = TunMTU;
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(mtu: usize, store: bool) -> (TunFakeIO, TunReader, TunWriter, TunMTU) {
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 fake = TunFakeIO {
tx: tx1,
rx: rx2,
store,
};
let reader = TunReader { rx: rx1 };
let writer = TunWriter {
tx: Mutex::new(tx2),
store,
};
let mtu = TunMTU {
mtu: Arc::new(AtomicUsize::new(mtu)),
};
(fake, reader, writer, mtu)
}
}
impl Platform for TunTest {
fn create(_name: &str) -> Result<(Vec<Self::Reader>, Self::Writer, Self::MTU), Self::Error> {
Err(TunError::Disconnected)
}
}
|
