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#![unstable(issue = "none", feature = "windows_net")]
use crate::cmp;
use crate::io::{self, IoSlice, IoSliceMut, Read};
use crate::mem;
use crate::net::{Shutdown, SocketAddr};
use crate::ptr;
use crate::sync::Once;
use crate::sys;
use crate::sys::c;
use crate::sys_common::net;
use crate::sys_common::{self, AsInner, FromInner, IntoInner};
use crate::time::Duration;
use libc::{c_int, c_long, c_ulong, c_void};
pub type wrlen_t = i32;
pub mod netc {
pub use crate::sys::c::ADDRESS_FAMILY as sa_family_t;
pub use crate::sys::c::ADDRINFOA as addrinfo;
pub use crate::sys::c::SOCKADDR as sockaddr;
pub use crate::sys::c::SOCKADDR_STORAGE_LH as sockaddr_storage;
pub use crate::sys::c::*;
}
pub struct Socket(c::SOCKET);
/// Checks whether the Windows socket interface has been started already, and
/// if not, starts it.
pub fn init() {
static START: Once = Once::new();
START.call_once(|| unsafe {
let mut data: c::WSADATA = mem::zeroed();
let ret = c::WSAStartup(
0x202, // version 2.2
&mut data,
);
assert_eq!(ret, 0);
let _ = sys_common::at_exit(|| {
c::WSACleanup();
});
});
}
/// Returns the last error from the Windows socket interface.
fn last_error() -> io::Error {
io::Error::from_raw_os_error(unsafe { c::WSAGetLastError() })
}
#[doc(hidden)]
pub trait IsMinusOne {
fn is_minus_one(&self) -> bool;
}
macro_rules! impl_is_minus_one {
($($t:ident)*) => ($(impl IsMinusOne for $t {
fn is_minus_one(&self) -> bool {
*self == -1
}
})*)
}
impl_is_minus_one! { i8 i16 i32 i64 isize }
/// Checks if the signed integer is the Windows constant `SOCKET_ERROR` (-1)
/// and if so, returns the last error from the Windows socket interface. This
/// function must be called before another call to the socket API is made.
pub fn cvt<T: IsMinusOne>(t: T) -> io::Result<T> {
if t.is_minus_one() { Err(last_error()) } else { Ok(t) }
}
/// A variant of `cvt` for `getaddrinfo` which return 0 for a success.
pub fn cvt_gai(err: c_int) -> io::Result<()> {
if err == 0 { Ok(()) } else { Err(last_error()) }
}
/// Just to provide the same interface as sys/unix/net.rs
pub fn cvt_r<T, F>(mut f: F) -> io::Result<T>
where
T: IsMinusOne,
F: FnMut() -> T,
{
cvt(f())
}
impl Socket {
pub fn new(addr: &SocketAddr, ty: c_int) -> io::Result<Socket> {
let fam = match *addr {
SocketAddr::V4(..) => c::AF_INET,
SocketAddr::V6(..) => c::AF_INET6,
};
let socket = unsafe {
match c::WSASocketW(
fam,
ty,
0,
ptr::null_mut(),
0,
c::WSA_FLAG_OVERLAPPED | c::WSA_FLAG_NO_HANDLE_INHERIT,
) {
c::INVALID_SOCKET => match c::WSAGetLastError() {
c::WSAEPROTOTYPE | c::WSAEINVAL => {
match c::WSASocketW(fam, ty, 0, ptr::null_mut(), 0, c::WSA_FLAG_OVERLAPPED)
{
c::INVALID_SOCKET => Err(last_error()),
n => {
let s = Socket(n);
s.set_no_inherit()?;
Ok(s)
}
}
}
n => Err(io::Error::from_raw_os_error(n)),
},
n => Ok(Socket(n)),
}
}?;
Ok(socket)
}
pub fn connect_timeout(&self, addr: &SocketAddr, timeout: Duration) -> io::Result<()> {
self.set_nonblocking(true)?;
let r = unsafe {
let (addrp, len) = addr.into_inner();
cvt(c::connect(self.0, addrp, len))
};
self.set_nonblocking(false)?;
match r {
Ok(_) => return Ok(()),
Err(ref e) if e.kind() == io::ErrorKind::WouldBlock => {}
Err(e) => return Err(e),
}
if timeout.as_secs() == 0 && timeout.subsec_nanos() == 0 {
return Err(io::Error::new(
io::ErrorKind::InvalidInput,
"cannot set a 0 duration timeout",
));
}
let mut timeout = c::timeval {
tv_sec: timeout.as_secs() as c_long,
tv_usec: (timeout.subsec_nanos() / 1000) as c_long,
};
if timeout.tv_sec == 0 && timeout.tv_usec == 0 {
timeout.tv_usec = 1;
}
let fds = unsafe {
let mut fds = mem::zeroed::<c::fd_set>();
fds.fd_count = 1;
fds.fd_array[0] = self.0;
fds
};
let mut writefds = fds;
let mut errorfds = fds;
let n =
unsafe { cvt(c::select(1, ptr::null_mut(), &mut writefds, &mut errorfds, &timeout))? };
match n {
0 => Err(io::Error::new(io::ErrorKind::TimedOut, "connection timed out")),
_ => {
if writefds.fd_count != 1 {
if let Some(e) = self.take_error()? {
return Err(e);
}
}
Ok(())
}
}
}
pub fn accept(&self, storage: *mut c::SOCKADDR, len: *mut c_int) -> io::Result<Socket> {
let socket = unsafe {
match c::accept(self.0, storage, len) {
c::INVALID_SOCKET => Err(last_error()),
n => Ok(Socket(n)),
}
}?;
Ok(socket)
}
pub fn duplicate(&self) -> io::Result<Socket> {
let socket = unsafe {
let mut info: c::WSAPROTOCOL_INFO = mem::zeroed();
cvt(c::WSADuplicateSocketW(self.0, c::GetCurrentProcessId(), &mut info))?;
match c::WSASocketW(
info.iAddressFamily,
info.iSocketType,
info.iProtocol,
&mut info,
0,
c::WSA_FLAG_OVERLAPPED | c::WSA_FLAG_NO_HANDLE_INHERIT,
) {
c::INVALID_SOCKET => match c::WSAGetLastError() {
c::WSAEPROTOTYPE | c::WSAEINVAL => {
match c::WSASocketW(
info.iAddressFamily,
info.iSocketType,
info.iProtocol,
&mut info,
0,
c::WSA_FLAG_OVERLAPPED,
) {
c::INVALID_SOCKET => Err(last_error()),
n => {
let s = Socket(n);
s.set_no_inherit()?;
Ok(s)
}
}
}
n => Err(io::Error::from_raw_os_error(n)),
},
n => Ok(Socket(n)),
}
}?;
Ok(socket)
}
fn recv_with_flags(&self, buf: &mut [u8], flags: c_int) -> io::Result<usize> {
// On unix when a socket is shut down all further reads return 0, so we
// do the same on windows to map a shut down socket to returning EOF.
let len = cmp::min(buf.len(), i32::max_value() as usize) as i32;
unsafe {
match c::recv(self.0, buf.as_mut_ptr() as *mut c_void, len, flags) {
-1 if c::WSAGetLastError() == c::WSAESHUTDOWN => Ok(0),
-1 => Err(last_error()),
n => Ok(n as usize),
}
}
}
pub fn read(&self, buf: &mut [u8]) -> io::Result<usize> {
self.recv_with_flags(buf, 0)
}
pub fn read_vectored(&self, bufs: &mut [IoSliceMut<'_>]) -> io::Result<usize> {
// On unix when a socket is shut down all further reads return 0, so we
// do the same on windows to map a shut down socket to returning EOF.
let len = cmp::min(bufs.len(), c::DWORD::max_value() as usize) as c::DWORD;
let mut nread = 0;
let mut flags = 0;
unsafe {
let ret = c::WSARecv(
self.0,
bufs.as_mut_ptr() as *mut c::WSABUF,
len,
&mut nread,
&mut flags,
ptr::null_mut(),
ptr::null_mut(),
);
match ret {
0 => Ok(nread as usize),
_ if c::WSAGetLastError() == c::WSAESHUTDOWN => Ok(0),
_ => Err(last_error()),
}
}
}
pub fn peek(&self, buf: &mut [u8]) -> io::Result<usize> {
self.recv_with_flags(buf, c::MSG_PEEK)
}
fn recv_from_with_flags(
&self,
buf: &mut [u8],
flags: c_int,
) -> io::Result<(usize, SocketAddr)> {
let mut storage: c::SOCKADDR_STORAGE_LH = unsafe { mem::zeroed() };
let mut addrlen = mem::size_of_val(&storage) as c::socklen_t;
let len = cmp::min(buf.len(), <wrlen_t>::max_value() as usize) as wrlen_t;
// On unix when a socket is shut down all further reads return 0, so we
// do the same on windows to map a shut down socket to returning EOF.
unsafe {
match c::recvfrom(
self.0,
buf.as_mut_ptr() as *mut c_void,
len,
flags,
&mut storage as *mut _ as *mut _,
&mut addrlen,
) {
-1 if c::WSAGetLastError() == c::WSAESHUTDOWN => {
Ok((0, net::sockaddr_to_addr(&storage, addrlen as usize)?))
}
-1 => Err(last_error()),
n => Ok((n as usize, net::sockaddr_to_addr(&storage, addrlen as usize)?)),
}
}
}
pub fn recv_from(&self, buf: &mut [u8]) -> io::Result<(usize, SocketAddr)> {
self.recv_from_with_flags(buf, 0)
}
pub fn peek_from(&self, buf: &mut [u8]) -> io::Result<(usize, SocketAddr)> {
self.recv_from_with_flags(buf, c::MSG_PEEK)
}
pub fn write_vectored(&self, bufs: &[IoSlice<'_>]) -> io::Result<usize> {
let len = cmp::min(bufs.len(), c::DWORD::max_value() as usize) as c::DWORD;
let mut nwritten = 0;
unsafe {
cvt(c::WSASend(
self.0,
bufs.as_ptr() as *const c::WSABUF as *mut c::WSABUF,
len,
&mut nwritten,
0,
ptr::null_mut(),
ptr::null_mut(),
))?;
}
Ok(nwritten as usize)
}
pub fn set_timeout(&self, dur: Option<Duration>, kind: c_int) -> io::Result<()> {
let timeout = match dur {
Some(dur) => {
let timeout = sys::dur2timeout(dur);
if timeout == 0 {
return Err(io::Error::new(
io::ErrorKind::InvalidInput,
"cannot set a 0 duration timeout",
));
}
timeout
}
None => 0,
};
net::setsockopt(self, c::SOL_SOCKET, kind, timeout)
}
pub fn timeout(&self, kind: c_int) -> io::Result<Option<Duration>> {
let raw: c::DWORD = net::getsockopt(self, c::SOL_SOCKET, kind)?;
if raw == 0 {
Ok(None)
} else {
let secs = raw / 1000;
let nsec = (raw % 1000) * 1000000;
Ok(Some(Duration::new(secs as u64, nsec as u32)))
}
}
#[cfg(not(target_vendor = "uwp"))]
fn set_no_inherit(&self) -> io::Result<()> {
sys::cvt(unsafe { c::SetHandleInformation(self.0 as c::HANDLE, c::HANDLE_FLAG_INHERIT, 0) })
.map(drop)
}
#[cfg(target_vendor = "uwp")]
fn set_no_inherit(&self) -> io::Result<()> {
Err(io::Error::new(io::ErrorKind::Other, "Unavailable on UWP"))
}
pub fn shutdown(&self, how: Shutdown) -> io::Result<()> {
let how = match how {
Shutdown::Write => c::SD_SEND,
Shutdown::Read => c::SD_RECEIVE,
Shutdown::Both => c::SD_BOTH,
};
cvt(unsafe { c::shutdown(self.0, how) })?;
Ok(())
}
pub fn set_nonblocking(&self, nonblocking: bool) -> io::Result<()> {
let mut nonblocking = nonblocking as c_ulong;
let r = unsafe { c::ioctlsocket(self.0, c::FIONBIO as c_int, &mut nonblocking) };
if r == 0 { Ok(()) } else { Err(io::Error::last_os_error()) }
}
pub fn set_nodelay(&self, nodelay: bool) -> io::Result<()> {
net::setsockopt(self, c::IPPROTO_TCP, c::TCP_NODELAY, nodelay as c::BYTE)
}
pub fn nodelay(&self) -> io::Result<bool> {
let raw: c::BYTE = net::getsockopt(self, c::IPPROTO_TCP, c::TCP_NODELAY)?;
Ok(raw != 0)
}
pub fn take_error(&self) -> io::Result<Option<io::Error>> {
let raw: c_int = net::getsockopt(self, c::SOL_SOCKET, c::SO_ERROR)?;
if raw == 0 { Ok(None) } else { Ok(Some(io::Error::from_raw_os_error(raw as i32))) }
}
}
#[unstable(reason = "not public", issue = "none", feature = "fd_read")]
impl<'a> Read for &'a Socket {
fn read(&mut self, buf: &mut [u8]) -> io::Result<usize> {
(**self).read(buf)
}
}
impl Drop for Socket {
fn drop(&mut self) {
let _ = unsafe { c::closesocket(self.0) };
}
}
impl AsInner<c::SOCKET> for Socket {
fn as_inner(&self) -> &c::SOCKET {
&self.0
}
}
impl FromInner<c::SOCKET> for Socket {
fn from_inner(sock: c::SOCKET) -> Socket {
Socket(sock)
}
}
impl IntoInner<c::SOCKET> for Socket {
fn into_inner(self) -> c::SOCKET {
let ret = self.0;
mem::forget(self);
ret
}
}