/
seq_packet.rs
134 lines (114 loc) · 3.64 KB
/
seq_packet.rs
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use std::io::{self, IoSlice, IoSliceMut};
use std::os::unix::io::{AsRawFd, FromRawFd, OwnedFd, RawFd};
use std::ptr;
use anyhow::Error;
use nix::sys::socket::{self, AddressFamily, SockFlag, SockType, SockaddrLike};
use tokio::io::unix::AsyncFd;
use crate::tools::AssertSendSync;
fn seq_packet_socket(flags: SockFlag) -> nix::Result<OwnedFd> {
let fd = socket::socket(
AddressFamily::Unix,
SockType::SeqPacket,
flags | SockFlag::SOCK_CLOEXEC,
None,
)?;
Ok(unsafe { OwnedFd::from_raw_fd(fd) })
}
pub struct SeqPacketListener {
fd: AsyncFd<OwnedFd>,
}
impl AsRawFd for SeqPacketListener {
#[inline]
fn as_raw_fd(&self) -> RawFd {
self.fd.as_raw_fd()
}
}
impl SeqPacketListener {
pub fn bind(address: &dyn SockaddrLike) -> Result<Self, Error> {
let fd = seq_packet_socket(SockFlag::empty())?;
socket::bind(fd.as_raw_fd(), address)?;
socket::listen(fd.as_raw_fd(), 16)?;
let fd = AsyncFd::new(fd)?;
Ok(Self { fd })
}
pub async fn accept(&mut self) -> io::Result<SeqPacketSocket> {
let fd = super::wrap_read(&self.fd, |fd| {
c_result!(unsafe {
libc::accept4(
fd,
ptr::null_mut(),
ptr::null_mut(),
libc::SOCK_CLOEXEC | libc::SOCK_NONBLOCK,
)
})
})
.await?;
let fd = unsafe { OwnedFd::from_raw_fd(fd as RawFd) };
SeqPacketSocket::new(fd)
}
}
pub struct SeqPacketSocket {
fd: AsyncFd<OwnedFd>,
}
impl AsRawFd for SeqPacketSocket {
#[inline]
fn as_raw_fd(&self) -> RawFd {
self.fd.as_raw_fd()
}
}
impl SeqPacketSocket {
pub fn new(fd: OwnedFd) -> io::Result<Self> {
Ok(Self {
fd: AsyncFd::new(fd)?,
})
}
async fn sendmsg(&self, msg: &AssertSendSync<libc::msghdr>) -> io::Result<usize> {
let rc = super::wrap_write(&self.fd, |fd| {
c_result!(unsafe { libc::sendmsg(fd, &msg.0 as *const libc::msghdr, 0) })
})
.await?;
Ok(rc as usize)
}
pub async fn sendmsg_vectored(&self, iov: &[IoSlice<'_>]) -> io::Result<usize> {
let msg = AssertSendSync(libc::msghdr {
msg_name: ptr::null_mut(),
msg_namelen: 0,
msg_iov: iov.as_ptr() as _,
msg_iovlen: iov.len(),
msg_control: ptr::null_mut(),
msg_controllen: 0,
msg_flags: 0,
});
self.sendmsg(&msg).await
}
async fn recvmsg(&self, msg: &mut AssertSendSync<libc::msghdr>) -> io::Result<usize> {
let rc = super::wrap_read(&self.fd, move |fd| {
c_result!(unsafe { libc::recvmsg(fd, &mut msg.0 as *mut libc::msghdr, 0) })
})
.await?;
Ok(rc as usize)
}
// clippy is wrong about this one
#[allow(clippy::needless_lifetimes)]
pub async fn recvmsg_vectored(
&self,
iov: &mut [IoSliceMut<'_>],
cmsg_buf: &mut [u8],
) -> io::Result<(usize, usize)> {
let mut msg = AssertSendSync(libc::msghdr {
msg_name: ptr::null_mut(),
msg_namelen: 0,
msg_iov: iov.as_ptr() as _,
msg_iovlen: iov.len(),
msg_control: cmsg_buf.as_mut_ptr() as *mut std::ffi::c_void,
msg_controllen: cmsg_buf.len(),
msg_flags: libc::MSG_CMSG_CLOEXEC,
});
let data_size = self.recvmsg(&mut msg).await?;
Ok((data_size, msg.0.msg_controllen))
}
#[inline]
pub fn shutdown(&self, how: socket::Shutdown) -> nix::Result<()> {
socket::shutdown(self.as_raw_fd(), how)
}
}