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// Copyright 2018 The Chromium OS Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#[allow(unused_imports)]
#[macro_use]
extern crate msg_on_socket_derive;
extern crate data_model;
#[macro_use]
extern crate sys_util;
mod msg_on_socket;
use std::io::Result;
use std::marker::PhantomData;
use std::ops::Deref;
use std::os::unix::io::{AsRawFd, RawFd};
use sys_util::{net::UnixSeqpacket, Error as SysError, ScmSocket};
pub use crate::msg_on_socket::*;
pub use msg_on_socket_derive::*;
/// Create a pair of socket. Request is send in one direction while response is in the other
/// direction.
pub fn pair<Request: MsgOnSocket, Response: MsgOnSocket>(
) -> Result<(MsgSocket<Request, Response>, MsgSocket<Response, Request>)> {
let (sock1, sock2) = UnixSeqpacket::pair()?;
let requester = MsgSocket {
sock: sock1,
_i: PhantomData,
_o: PhantomData,
};
let responder = MsgSocket {
sock: sock2,
_i: PhantomData,
_o: PhantomData,
};
Ok((requester, responder))
}
/// Bidirection sock that support both send and recv.
pub struct MsgSocket<I: MsgOnSocket, O: MsgOnSocket> {
sock: UnixSeqpacket,
_i: PhantomData<I>,
_o: PhantomData<O>,
}
impl<I: MsgOnSocket, O: MsgOnSocket> MsgSocket<I, O> {
// Create a new MsgSocket.
pub fn new(s: UnixSeqpacket) -> MsgSocket<I, O> {
MsgSocket {
sock: s,
_i: PhantomData,
_o: PhantomData,
}
}
}
impl<I: MsgOnSocket, O: MsgOnSocket> Deref for MsgSocket<I, O> {
type Target = UnixSeqpacket;
fn deref(&self) -> &Self::Target {
&self.sock
}
}
/// One direction socket that only supports sending.
pub struct Sender<M: MsgOnSocket> {
sock: UnixSeqpacket,
_m: PhantomData<M>,
}
impl<M: MsgOnSocket> Sender<M> {
/// Create a new sender sock.
pub fn new(s: UnixSeqpacket) -> Sender<M> {
Sender {
sock: s,
_m: PhantomData,
}
}
}
/// One direction socket that only supports receiving.
pub struct Receiver<M: MsgOnSocket> {
sock: UnixSeqpacket,
_m: PhantomData<M>,
}
impl<M: MsgOnSocket> Receiver<M> {
/// Create a new receiver sock.
pub fn new(s: UnixSeqpacket) -> Receiver<M> {
Receiver {
sock: s,
_m: PhantomData,
}
}
}
impl<I: MsgOnSocket, O: MsgOnSocket> AsRef<UnixSeqpacket> for MsgSocket<I, O> {
fn as_ref(&self) -> &UnixSeqpacket {
&self.sock
}
}
impl<I: MsgOnSocket, O: MsgOnSocket> AsRawFd for MsgSocket<I, O> {
fn as_raw_fd(&self) -> RawFd {
self.sock.as_raw_fd()
}
}
impl<M: MsgOnSocket> AsRef<UnixSeqpacket> for Sender<M> {
fn as_ref(&self) -> &UnixSeqpacket {
&self.sock
}
}
impl<M: MsgOnSocket> AsRawFd for Sender<M> {
fn as_raw_fd(&self) -> RawFd {
self.sock.as_raw_fd()
}
}
impl<M: MsgOnSocket> AsRef<UnixSeqpacket> for Receiver<M> {
fn as_ref(&self) -> &UnixSeqpacket {
&self.sock
}
}
impl<M: MsgOnSocket> AsRawFd for Receiver<M> {
fn as_raw_fd(&self) -> RawFd {
self.sock.as_raw_fd()
}
}
/// Types that could send a message.
pub trait MsgSender<M: MsgOnSocket>: AsRef<UnixSeqpacket> {
fn send(&self, msg: &M) -> MsgResult<()> {
let msg_size = M::msg_size();
let fd_size = M::max_fd_count();
let mut msg_buffer: Vec<u8> = vec![0; msg_size];
let mut fd_buffer: Vec<RawFd> = vec![0; fd_size];
let fd_size = msg.write_to_buffer(&mut msg_buffer, &mut fd_buffer)?;
let sock: &UnixSeqpacket = self.as_ref();
if fd_size == 0 {
handle_eintr!(sock.send(&msg_buffer))
.map_err(|e| MsgError::Send(SysError::new(e.raw_os_error().unwrap_or(0))))?;
} else {
sock.send_with_fds(&msg_buffer[..], &fd_buffer[0..fd_size])
.map_err(MsgError::Send)?;
}
Ok(())
}
}
/// Types that could receive a message.
pub trait MsgReceiver<M: MsgOnSocket>: AsRef<UnixSeqpacket> {
fn recv(&self) -> MsgResult<M> {
let msg_size = M::msg_size();
let fd_size = M::max_fd_count();
let mut msg_buffer: Vec<u8> = vec![0; msg_size];
let mut fd_buffer: Vec<RawFd> = vec![0; fd_size];
let sock: &UnixSeqpacket = self.as_ref();
let (recv_msg_size, recv_fd_size) = {
if fd_size == 0 {
let size = sock
.recv(&mut msg_buffer)
.map_err(|e| MsgError::Recv(SysError::new(e.raw_os_error().unwrap_or(0))))?;
(size, 0)
} else {
sock.recv_with_fds(&mut msg_buffer, &mut fd_buffer)
.map_err(MsgError::Recv)?
}
};
if msg_size != recv_msg_size {
return Err(MsgError::BadRecvSize {
expected: msg_size,
actual: recv_msg_size,
});
}
// Safe because fd buffer is read from socket.
let (v, read_fd_size) = unsafe {
M::read_from_buffer(&msg_buffer[0..recv_msg_size], &fd_buffer[0..recv_fd_size])?
};
if recv_fd_size != read_fd_size {
return Err(MsgError::NotExpectFd);
}
Ok(v)
}
}
impl<I: MsgOnSocket, O: MsgOnSocket> MsgSender<I> for MsgSocket<I, O> {}
impl<I: MsgOnSocket, O: MsgOnSocket> MsgReceiver<O> for MsgSocket<I, O> {}
impl<M: MsgOnSocket> MsgSender<M> for Sender<M> {}
impl<M: MsgOnSocket> MsgReceiver<M> for Receiver<M> {}
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