2023-09-23 16:09:44 +08:00
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use mio::{event, windows::NamedPipe, Interest, Registry, Token};
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2023-09-18 21:40:56 +08:00
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use smoltcp::{
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phy::{self, Device, DeviceCapabilities, Medium},
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time::Instant,
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};
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use std::{
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2023-09-23 16:09:44 +08:00
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fs::OpenOptions,
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2023-09-18 21:40:56 +08:00
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io,
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net::{IpAddr, Ipv4Addr},
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2023-09-23 16:09:44 +08:00
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os::windows::prelude::{FromRawHandle, IntoRawHandle, OpenOptionsExt},
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2023-09-18 21:40:56 +08:00
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sync::Arc,
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vec::Vec,
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};
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2023-09-23 16:09:44 +08:00
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use windows::{
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core::PCWSTR,
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Win32::{
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Security::Cryptography::{CryptAcquireContextW, CryptGenRandom, CryptReleaseContext, PROV_RSA_FULL},
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Storage::FileSystem::FILE_FLAG_OVERLAPPED,
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},
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};
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fn generate_random_bytes(len: usize) -> Result<Vec<u8>, windows::core::Error> {
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let mut buf = vec![0u8; len];
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unsafe {
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let mut h_prov = 0_usize;
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let null = PCWSTR::null();
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CryptAcquireContextW(&mut h_prov, null, null, PROV_RSA_FULL, 0)?;
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CryptGenRandom(h_prov, &mut buf)?;
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CryptReleaseContext(h_prov, 0)?;
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};
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Ok(buf)
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}
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fn server() -> io::Result<(NamedPipe, String)> {
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let num = generate_random_bytes(8).unwrap();
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let num = num.iter().fold(0, |acc, &x| acc * 256 + x as u64);
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let name = format!(r"\\.\pipe\my-pipe-{}", num);
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let pipe = NamedPipe::new(&name)?;
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Ok((pipe, name))
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}
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fn client(name: &str) -> io::Result<NamedPipe> {
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let mut opts = OpenOptions::new();
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opts.read(true).write(true).custom_flags(FILE_FLAG_OVERLAPPED.0);
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let file = opts.open(name)?;
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unsafe { Ok(NamedPipe::from_raw_handle(file.into_raw_handle())) }
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}
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fn pipe() -> io::Result<(NamedPipe, NamedPipe)> {
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let (pipe, name) = server()?;
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Ok((pipe, client(&name)?))
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}
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2023-09-18 21:40:56 +08:00
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/// A virtual TUN (IP) interface.
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pub struct WinTunInterface {
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inner: Arc<wintun::Session>,
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mtu: usize,
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medium: Medium,
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2023-09-23 16:09:44 +08:00
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pipe_server: NamedPipe,
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pipe_client: NamedPipe,
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}
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// impl AsRawFd for WinTunInterface {
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// fn as_raw_fd(&self) -> RawFd {
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// self.inner.borrow().as_raw_fd()
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// }
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// }
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2023-09-19 12:55:02 +08:00
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impl event::Source for WinTunInterface {
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fn register(&mut self, registry: &Registry, token: Token, interests: Interest) -> io::Result<()> {
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registry.register(&mut self.pipe_server, token, interests)?;
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Ok(())
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}
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2023-09-23 16:09:44 +08:00
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fn reregister(&mut self, registry: &Registry, token: Token, interests: Interest) -> io::Result<()> {
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registry.reregister(&mut self.pipe_server, token, interests)?;
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Ok(())
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}
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2023-09-23 16:09:44 +08:00
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fn deregister(&mut self, registry: &Registry) -> io::Result<()> {
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registry.deregister(&mut self.pipe_server)?;
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Ok(())
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2023-09-19 12:55:02 +08:00
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}
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}
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impl WinTunInterface {
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pub fn new(name: &str, medium: Medium) -> io::Result<WinTunInterface> {
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let wintun = unsafe { wintun::load() }.map_err(|e| io::Error::new(io::ErrorKind::Other, e))?;
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let tun_name = name;
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let adapter = match wintun::Adapter::open(&wintun, tun_name) {
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Ok(a) => a,
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Err(_) => wintun::Adapter::create(&wintun, tun_name, tun_name, None)
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.map_err(|e| io::Error::new(io::ErrorKind::Other, e))?,
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};
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let address = Ipv4Addr::new(10, 1, 0, 33);
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let mask = Ipv4Addr::new(255, 255, 255, 0);
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let gateway = Some(IpAddr::V4(Ipv4Addr::new(10, 1, 0, 1)));
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adapter
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.set_network_addresses_tuple(IpAddr::V4(address), IpAddr::V4(mask), gateway)
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.map_err(|e| io::Error::new(io::ErrorKind::Other, e))?;
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let session = adapter
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.start_session(wintun::MAX_RING_CAPACITY)
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.map_err(|e| io::Error::new(io::ErrorKind::Other, e))?;
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let inner = Arc::new(session);
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2023-09-23 16:09:44 +08:00
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let (pipe_server, pipe_client) = pipe()?;
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2023-09-18 21:40:56 +08:00
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// let inner = WinTunInterfaceDesc::new(name, medium)?;
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// let mtu = inner.interface_mtu()?;
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let mtu = 1500;
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Ok(WinTunInterface {
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inner,
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mtu,
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medium,
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pipe_server,
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pipe_client,
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})
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2023-09-18 21:40:56 +08:00
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}
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}
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impl Drop for WinTunInterface {
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fn drop(&mut self) {
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if let Err(e) = self.inner.shutdown() {
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log::error!("phy: failed to shutdown interface: {}", e);
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}
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}
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}
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impl Device for WinTunInterface {
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type RxToken<'a> = RxToken;
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type TxToken<'a> = TxToken;
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fn capabilities(&self) -> DeviceCapabilities {
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let mut v = DeviceCapabilities::default();
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v.max_transmission_unit = self.mtu;
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v.medium = self.medium;
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v
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}
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fn receive(&mut self, _timestamp: Instant) -> Option<(Self::RxToken<'_>, Self::TxToken<'_>)> {
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let inner = self.inner.clone();
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match inner.receive_blocking() {
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Ok(read_pack) => Some((
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RxToken {
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buffer: read_pack.bytes().to_vec(),
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},
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TxToken { inner },
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)),
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Err(err) => {
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log::error!("phy: failed to receive packet: {}", err);
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None
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}
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}
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// match inner.recv(&mut buffer[..]) {
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// Ok(size) => {
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// buffer.resize(size, 0);
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// let rx = RxToken { buffer };
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// let tx = TxToken {
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// inner: self.inner.clone(),
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// };
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// Some((rx, tx))
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// }
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// Err(err) if err.kind() == io::ErrorKind::WouldBlock => None,
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// Err(err) => panic!("{}", err),
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// }
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}
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fn transmit(&mut self, _timestamp: Instant) -> Option<Self::TxToken<'_>> {
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Some(TxToken {
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inner: self.inner.clone(),
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})
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}
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}
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#[doc(hidden)]
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pub struct RxToken {
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buffer: Vec<u8>,
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}
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impl phy::RxToken for RxToken {
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fn consume<R, F>(mut self, f: F) -> R
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where
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F: FnOnce(&mut [u8]) -> R,
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{
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f(&mut self.buffer[..])
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}
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}
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#[doc(hidden)]
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pub struct TxToken {
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inner: Arc<wintun::Session>,
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}
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impl phy::TxToken for TxToken {
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fn consume<R, F>(self, len: usize, f: F) -> R
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where
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F: FnOnce(&mut [u8]) -> R,
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{
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let inner = self.inner.clone();
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let mut buffer = vec![0; len];
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let result = f(&mut buffer);
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let write_pack = inner.allocate_send_packet(len as u16);
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if let Ok(mut write_pack) = write_pack {
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write_pack.bytes_mut().copy_from_slice(&buffer[..]);
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inner.send_packet(write_pack);
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} else if let Err(err) = write_pack {
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log::error!("phy: failed to allocate send packet: {}", err);
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}
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// match lower.send(&buffer[..]) {
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// Ok(_) => {}
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// Err(err) if err.kind() == io::ErrorKind::WouldBlock => {
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// log::error!("phy: tx failed due to WouldBlock")
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// }
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// Err(err) => panic!("{}", err),
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// }
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result
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}
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}
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