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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::{Error, Read, Result, Write};
use std::net::Shutdown;
use std::os::fd::{AsFd, BorrowedFd};
use std::os::unix::io::{AsRawFd, FromRawFd, IntoRawFd, RawFd};
use crate::split::{split_owned, OwnedReadHalf, OwnedWriteHalf, ReadHalf, WriteHalf};
use crate::VsockAddr;
use futures::ready;
use libc::*;
use std::mem::{self, size_of};
use std::pin::Pin;
use std::task::{Context, Poll};
use tokio::io::unix::AsyncFd;
use tokio::io::{AsyncRead, AsyncWrite, ReadBuf};
/// An I/O object representing a Virtio socket connected to a remote endpoint.
#[derive(Debug)]
pub struct VsockStream {
inner: AsyncFd<vsock::VsockStream>,
}
impl VsockStream {
pub fn new(connected: vsock::VsockStream) -> Result<Self> {
connected.set_nonblocking(true)?;
Ok(Self {
inner: AsyncFd::new(connected)?,
})
}
/// Open a connection to a remote host.
pub async fn connect(addr: VsockAddr) -> Result<Self> {
let socket = unsafe { socket(AF_VSOCK, SOCK_STREAM | SOCK_CLOEXEC, 0) };
if socket < 0 {
return Err(Error::last_os_error());
}
if unsafe { fcntl(socket, F_SETFL, O_NONBLOCK) } < 0 {
let _ = unsafe { close(socket) };
return Err(Error::last_os_error());
}
if unsafe {
connect(
socket,
&addr as *const _ as *const sockaddr,
size_of::<sockaddr_vm>() as socklen_t,
)
} < 0
{
let err = Error::last_os_error();
if let Some(os_err) = err.raw_os_error() {
// Connect hasn't finished, that's fine.
if os_err != EINPROGRESS {
// Close the socket if we hit an error, ignoring the error
// from closing since we can't pass back two errors.
let _ = unsafe { close(socket) };
return Err(err);
}
}
}
loop {
let stream = unsafe { vsock::VsockStream::from_raw_fd(socket) };
let stream = Self::new(stream)?;
let mut guard = stream.inner.writable().await?;
// Checks if the connection failed or not
let conn_check = guard.try_io(|fd| {
let mut sock_err: c_int = 0;
let mut sock_err_len: socklen_t = size_of::<c_int>() as socklen_t;
let err = unsafe {
getsockopt(
fd.as_raw_fd(),
SOL_SOCKET,
SO_ERROR,
&mut sock_err as *mut _ as *mut c_void,
&mut sock_err_len as *mut socklen_t,
)
};
if err < 0 {
return Err(Error::last_os_error());
}
if sock_err == 0 {
Ok(())
} else {
Err(Error::from_raw_os_error(sock_err))
}
});
match conn_check {
Ok(Ok(_)) => return Ok(stream),
Ok(Err(err)) => return Err(err),
Err(_would_block) => continue,
}
}
}
/// The local address that this socket is bound to.
pub fn local_addr(&self) -> Result<VsockAddr> {
self.inner.get_ref().local_addr()
}
/// The remote address that this socket is connected to.
pub fn peer_addr(&self) -> Result<VsockAddr> {
self.inner.get_ref().peer_addr()
}
/// Shuts down the read, write, or both halves of this connection.
pub fn shutdown(&self, how: Shutdown) -> Result<()> {
self.inner.get_ref().shutdown(how)
}
/// Splits a single value implementing `AsyncRead + AsyncWrite` into separate
/// `AsyncRead` and `AsyncWrite` handles.
pub fn split(&mut self) -> (ReadHalf<'_>, WriteHalf<'_>) {
crate::split::split(self)
}
/// Splits a single value implementing `AsyncRead + AsyncWrite` into separate
/// `AsyncRead` and `AsyncWrite` handles.
///
/// To restore this read/write object from its `OwnedReadHalf` and
/// `OwnedWriteHalf` use [`unsplit`](OwnedReadHalf::unsplit()).
pub fn into_split(self) -> (OwnedReadHalf, OwnedWriteHalf) {
split_owned(self)
}
pub(crate) fn poll_write_priv(&self, cx: &mut Context<'_>, buf: &[u8]) -> Poll<Result<usize>> {
loop {
let mut guard = ready!(self.inner.poll_write_ready(cx))?;
match guard.try_io(|inner| inner.get_ref().write(buf)) {
Ok(Ok(n)) => return Ok(n).into(),
Ok(Err(ref e)) if e.kind() == std::io::ErrorKind::Interrupted => continue,
Ok(Err(e)) => return Err(e).into(),
Err(_would_block) => continue,
}
}
}
pub(crate) fn poll_read_priv(
&self,
cx: &mut Context<'_>,
buf: &mut ReadBuf<'_>,
) -> Poll<Result<()>> {
let b;
unsafe {
b = &mut *(buf.unfilled_mut() as *mut [mem::MaybeUninit<u8>] as *mut [u8]);
};
loop {
let mut guard = ready!(self.inner.poll_read_ready(cx))?;
match guard.try_io(|inner| inner.get_ref().read(b)) {
Ok(Ok(n)) => {
unsafe {
buf.assume_init(n);
}
buf.advance(n);
return Ok(()).into();
}
Ok(Err(ref e)) if e.kind() == std::io::ErrorKind::Interrupted => continue,
Ok(Err(e)) => return Err(e).into(),
Err(_would_block) => {
continue;
}
}
}
}
}
impl AsFd for VsockStream {
fn as_fd(&self) -> BorrowedFd<'_> {
self.inner.get_ref().as_fd()
}
}
impl AsRawFd for VsockStream {
fn as_raw_fd(&self) -> RawFd {
self.inner.get_ref().as_raw_fd()
}
}
impl IntoRawFd for VsockStream {
fn into_raw_fd(self) -> RawFd {
let fd = self.inner.get_ref().as_raw_fd();
mem::forget(self);
fd
}
}
impl Write for VsockStream {
fn write(&mut self, buf: &[u8]) -> Result<usize> {
self.inner.get_ref().write(buf)
}
fn flush(&mut self) -> Result<()> {
Ok(())
}
}
impl Read for VsockStream {
fn read(&mut self, buf: &mut [u8]) -> Result<usize> {
self.inner.get_ref().read(buf)
}
}
impl AsyncWrite for VsockStream {
fn poll_write(self: Pin<&mut Self>, cx: &mut Context<'_>, buf: &[u8]) -> Poll<Result<usize>> {
self.poll_write_priv(cx, buf)
}
fn poll_flush(self: Pin<&mut Self>, _: &mut Context<'_>) -> Poll<Result<()>> {
Poll::Ready(Ok(()))
}
fn poll_shutdown(self: Pin<&mut Self>, _: &mut Context<'_>) -> Poll<Result<()>> {
self.shutdown(std::net::Shutdown::Write)?;
Poll::Ready(Ok(()))
}
}
impl AsyncRead for VsockStream {
fn poll_read(
self: Pin<&mut Self>,
cx: &mut Context<'_>,
buf: &mut ReadBuf<'_>,
) -> Poll<Result<()>> {
self.poll_read_priv(cx, buf)
}
}