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use std::cell::RefCell;
use std::io;
use std::os::unix::io::{AsRawFd, RawFd};
use std::rc::Rc;
use std::vec::Vec;
use crate::phy::{self, sys, Device, DeviceCapabilities, Medium};
use crate::time::Instant;
use crate::Result;
#[derive(Debug)]
pub struct TunTapInterface {
lower: Rc<RefCell<sys::TunTapInterfaceDesc>>,
mtu: usize,
medium: Medium,
}
impl AsRawFd for TunTapInterface {
fn as_raw_fd(&self) -> RawFd {
self.lower.borrow().as_raw_fd()
}
}
impl TunTapInterface {
pub fn new(name: &str, medium: Medium) -> io::Result<TunTapInterface> {
let mut lower = sys::TunTapInterfaceDesc::new(name, medium)?;
lower.attach_interface()?;
let mtu = lower.interface_mtu()?;
Ok(TunTapInterface {
lower: Rc::new(RefCell::new(lower)),
mtu,
medium,
})
}
}
impl<'a> Device<'a> for TunTapInterface {
type RxToken = RxToken;
type TxToken = TxToken;
fn capabilities(&self) -> DeviceCapabilities {
DeviceCapabilities {
max_transmission_unit: self.mtu,
medium: self.medium,
..DeviceCapabilities::default()
}
}
fn receive(&'a mut self) -> Option<(Self::RxToken, Self::TxToken)> {
let mut lower = self.lower.borrow_mut();
let mut buffer = vec![0; self.mtu];
match lower.recv(&mut buffer[..]) {
Ok(size) => {
buffer.resize(size, 0);
let rx = RxToken { buffer };
let tx = TxToken {
lower: self.lower.clone(),
};
Some((rx, tx))
}
Err(ref err) if err.kind() == io::ErrorKind::WouldBlock => None,
Err(err) => panic!("{}", err),
}
}
fn transmit(&'a mut self) -> Option<Self::TxToken> {
Some(TxToken {
lower: self.lower.clone(),
})
}
}
#[doc(hidden)]
pub struct RxToken {
buffer: Vec<u8>,
}
impl phy::RxToken for RxToken {
fn consume<R, F>(mut self, _timestamp: Instant, f: F) -> Result<R>
where
F: FnOnce(&mut [u8]) -> Result<R>,
{
f(&mut self.buffer[..])
}
}
#[doc(hidden)]
pub struct TxToken {
lower: Rc<RefCell<sys::TunTapInterfaceDesc>>,
}
impl phy::TxToken for TxToken {
fn consume<R, F>(self, _timestamp: Instant, len: usize, f: F) -> Result<R>
where
F: FnOnce(&mut [u8]) -> Result<R>,
{
let mut lower = self.lower.borrow_mut();
let mut buffer = vec![0; len];
let result = f(&mut buffer);
lower.send(&buffer[..]).unwrap();
result
}
}