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use std::io;
use std::mem;
use std::mem::{size_of, MaybeUninit};
use std::net::{self, SocketAddr};
use std::time::Duration;
use std::os::unix::io::{AsRawFd, FromRawFd};
use crate::sys::unix::net::{new_socket, socket_addr, to_socket_addr};
pub type TcpSocket = libc::c_int;
pub(crate) fn new_v4_socket() -> io::Result<TcpSocket> {
new_socket(libc::AF_INET, libc::SOCK_STREAM)
}
pub(crate) fn new_v6_socket() -> io::Result<TcpSocket> {
new_socket(libc::AF_INET6, libc::SOCK_STREAM)
}
pub(crate) fn bind(socket: TcpSocket, addr: SocketAddr) -> io::Result<()> {
let (raw_addr, raw_addr_length) = socket_addr(&addr);
syscall!(bind(socket, raw_addr, raw_addr_length))?;
Ok(())
}
pub(crate) fn connect(socket: TcpSocket, addr: SocketAddr) -> io::Result<net::TcpStream> {
let (raw_addr, raw_addr_length) = socket_addr(&addr);
match syscall!(connect(socket, raw_addr, raw_addr_length)) {
Err(err) if err.raw_os_error() != Some(libc::EINPROGRESS) => {
Err(err)
}
_ => {
Ok(unsafe { net::TcpStream::from_raw_fd(socket) })
}
}
}
pub(crate) fn listen(socket: TcpSocket, backlog: u32) -> io::Result<net::TcpListener> {
use std::convert::TryInto;
let backlog = backlog.try_into().unwrap_or(i32::max_value());
syscall!(listen(socket, backlog))?;
Ok(unsafe { net::TcpListener::from_raw_fd(socket) })
}
pub(crate) fn close(socket: TcpSocket) {
let _ = unsafe { net::TcpStream::from_raw_fd(socket) };
}
pub(crate) fn set_reuseaddr(socket: TcpSocket, reuseaddr: bool) -> io::Result<()> {
let val: libc::c_int = if reuseaddr { 1 } else { 0 };
syscall!(setsockopt(
socket,
libc::SOL_SOCKET,
libc::SO_REUSEADDR,
&val as *const libc::c_int as *const libc::c_void,
size_of::<libc::c_int>() as libc::socklen_t,
)).map(|_| ())
}
pub(crate) fn get_reuseaddr(socket: TcpSocket) -> io::Result<bool> {
let mut optval: libc::c_int = 0;
let mut optlen = mem::size_of::<libc::c_int>() as libc::socklen_t;
syscall!(getsockopt(
socket,
libc::SOL_SOCKET,
libc::SO_REUSEADDR,
&mut optval as *mut _ as *mut _,
&mut optlen,
))?;
Ok(optval != 0)
}
#[cfg(all(unix, not(any(target_os = "solaris", target_os = "illumos"))))]
pub(crate) fn set_reuseport(socket: TcpSocket, reuseport: bool) -> io::Result<()> {
let val: libc::c_int = if reuseport { 1 } else { 0 };
syscall!(setsockopt(
socket,
libc::SOL_SOCKET,
libc::SO_REUSEPORT,
&val as *const libc::c_int as *const libc::c_void,
size_of::<libc::c_int>() as libc::socklen_t,
)).map(|_| ())
}
#[cfg(all(unix, not(any(target_os = "solaris", target_os = "illumos"))))]
pub(crate) fn get_reuseport(socket: TcpSocket) -> io::Result<bool> {
let mut optval: libc::c_int = 0;
let mut optlen = mem::size_of::<libc::c_int>() as libc::socklen_t;
syscall!(getsockopt(
socket,
libc::SOL_SOCKET,
libc::SO_REUSEPORT,
&mut optval as *mut _ as *mut _,
&mut optlen,
))?;
Ok(optval != 0)
}
pub(crate) fn get_localaddr(socket: TcpSocket) -> io::Result<SocketAddr> {
let mut addr: libc::sockaddr_storage = unsafe { std::mem::zeroed() };
let mut length = size_of::<libc::sockaddr_storage>() as libc::socklen_t;
syscall!(getsockname(
socket,
&mut addr as *mut _ as *mut _,
&mut length
))?;
unsafe { to_socket_addr(&addr) }
}
pub(crate) fn set_linger(socket: TcpSocket, dur: Option<Duration>) -> io::Result<()> {
let val: libc::linger = libc::linger {
l_onoff: if dur.is_some() { 1 } else { 0 },
l_linger: dur.map(|dur| dur.as_secs() as libc::c_int).unwrap_or_default(),
};
syscall!(setsockopt(
socket,
libc::SOL_SOCKET,
libc::SO_LINGER,
&val as *const libc::linger as *const libc::c_void,
size_of::<libc::linger>() as libc::socklen_t,
)).map(|_| ())
}
pub fn accept(listener: &net::TcpListener) -> io::Result<(net::TcpStream, SocketAddr)> {
let mut addr: MaybeUninit<libc::sockaddr_storage> = MaybeUninit::uninit();
let mut length = size_of::<libc::sockaddr_storage>() as libc::socklen_t;
// On platforms that support it we can use `accept4(2)` to set `NONBLOCK`
// and `CLOEXEC` in the call to accept the connection.
#[cfg(any(
target_os = "android",
target_os = "dragonfly",
target_os = "freebsd",
target_os = "illumos",
target_os = "linux",
target_os = "netbsd",
target_os = "openbsd"
))]
let stream = {
syscall!(accept4(
listener.as_raw_fd(),
addr.as_mut_ptr() as *mut _,
&mut length,
libc::SOCK_CLOEXEC | libc::SOCK_NONBLOCK,
))
.map(|socket| unsafe { net::TcpStream::from_raw_fd(socket) })
}?;
// But not all platforms have the `accept4(2)` call. Luckily BSD (derived)
// OSes inherit the non-blocking flag from the listener, so we just have to
// set `CLOEXEC`.
#[cfg(any(target_os = "ios", target_os = "macos", target_os = "solaris"))]
let stream = {
syscall!(accept(
listener.as_raw_fd(),
addr.as_mut_ptr() as *mut _,
&mut length
))
.map(|socket| unsafe { net::TcpStream::from_raw_fd(socket) })
.and_then(|s| syscall!(fcntl(s.as_raw_fd(), libc::F_SETFD, libc::FD_CLOEXEC)).map(|_| s))
}?;
// This is safe because `accept` calls above ensures the address
// initialised.
unsafe { to_socket_addr(addr.as_ptr()) }.map(|addr| (stream, addr))
}
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