tokio_vsock/listener.rs
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/*
* Tokio Reference TCP Implementation
* Copyright (c) 2019 Tokio Contributors
*
* Permission is hereby granted, free of charge, to any
* person obtaining a copy of this software and associated
* documentation files (the "Software"), to deal in the
* Software without restriction, including without
* limitation the rights to use, copy, modify, merge,
* publish, distribute, sublicense, and/or sell copies of
* the Software, and to permit persons to whom the Software
* is furnished to do so, subject to the following
* conditions:
*
* The above copyright notice and this permission notice
* shall be included in all copies or substantial portions
* of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF
* ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
* TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
* PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT
* SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR
* IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*/
/*
* Copyright 2019 fsyncd, Berlin, Germany.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
use std::io::Result;
use std::os::fd::{AsFd, BorrowedFd};
use std::os::unix::io::{AsRawFd, FromRawFd, IntoRawFd, RawFd};
use futures::{future::poll_fn, ready, stream::Stream};
use std::mem;
use std::pin::Pin;
use std::task::{Context, Poll};
use tokio::io::unix::AsyncFd;
use crate::stream::VsockStream;
use crate::VsockAddr;
/// An I/O object representing a Virtio socket listening for incoming connections.
#[derive(Debug)]
pub struct VsockListener {
inner: AsyncFd<vsock::VsockListener>,
}
impl VsockListener {
fn new(listener: vsock::VsockListener) -> Result<Self> {
listener.set_nonblocking(true)?;
Ok(Self {
inner: AsyncFd::new(listener)?,
})
}
/// Create a new Virtio socket listener associated with this event loop.
pub fn bind(addr: VsockAddr) -> Result<Self> {
let l = vsock::VsockListener::bind_with_cid_port(addr.cid(), addr.port())?;
Self::new(l)
}
/// Accepts a new incoming connection to this listener.
pub async fn accept(&mut self) -> Result<(VsockStream, VsockAddr)> {
poll_fn(|cx| self.poll_accept(cx)).await
}
/// Attempt to accept a connection and create a new connected socket if
/// successful.
pub fn poll_accept(&mut self, cx: &mut Context<'_>) -> Poll<Result<(VsockStream, VsockAddr)>> {
let (inner, addr) = ready!(self.poll_accept_std(cx))?;
let inner = VsockStream::new(inner)?;
Ok((inner, addr)).into()
}
/// Attempt to accept a connection and create a new connected socket if
/// successful.
pub fn poll_accept_std(
&mut self,
cx: &mut Context<'_>,
) -> Poll<Result<(vsock::VsockStream, VsockAddr)>> {
loop {
let mut guard = ready!(self.inner.poll_read_ready(cx))?;
match guard.try_io(|inner| inner.get_ref().accept()) {
Ok(Ok((inner, addr))) => return Ok((inner, addr)).into(),
// continue on interrupt...
Ok(Err(ref e)) if e.kind() == std::io::ErrorKind::Interrupted => continue,
Ok(Err(e)) => return Err(e).into(),
Err(_would_block) => continue,
}
}
}
/// The local address that this listener is bound to.
pub fn local_addr(&self) -> Result<VsockAddr> {
self.inner.get_ref().local_addr()
}
/// Consumes this listener, returning a stream of the sockets this listener
/// accepts.
pub fn incoming(self) -> Incoming {
Incoming::new(self)
}
}
impl AsFd for VsockListener {
fn as_fd(&self) -> BorrowedFd<'_> {
self.inner.get_ref().as_fd()
}
}
impl FromRawFd for VsockListener {
unsafe fn from_raw_fd(fd: RawFd) -> Self {
Self::new(vsock::VsockListener::from_raw_fd(fd)).unwrap()
}
}
impl AsRawFd for VsockListener {
fn as_raw_fd(&self) -> RawFd {
self.inner.get_ref().as_raw_fd()
}
}
impl IntoRawFd for VsockListener {
fn into_raw_fd(self) -> RawFd {
let fd = self.inner.get_ref().as_raw_fd();
mem::forget(self);
fd
}
}
/// Stream returned by the `VsockListener::incoming` representing sockets received from a listener.
#[derive(Debug)]
pub struct Incoming {
inner: VsockListener,
}
impl Incoming {
fn new(listener: VsockListener) -> Incoming {
Incoming { inner: listener }
}
}
impl Stream for Incoming {
type Item = Result<VsockStream>;
fn poll_next(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Option<Self::Item>> {
let (socket, _) = ready!(self.inner.poll_accept(cx))?;
Poll::Ready(Some(Ok(socket)))
}
}
impl AsRawFd for Incoming {
fn as_raw_fd(&self) -> RawFd {
self.inner.as_raw_fd()
}
}