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use std::io;
use std::mem::{self, MaybeUninit};
use std::net::{self, SocketAddr};
use std::os::windows::io::{AsRawSocket, FromRawSocket};
use std::os::windows::raw::SOCKET as StdSocket; // windows-sys uses usize, stdlib uses u32/u64.
use crate::sys::windows::net::{init, new_ip_socket, socket_addr};
use windows_sys::Win32::Networking::WinSock::{
bind as win_bind, closesocket, getsockopt, IPPROTO_IPV6, IPV6_V6ONLY, SOCKET_ERROR, SOCK_DGRAM,
};
pub fn bind(addr: SocketAddr) -> io::Result<net::UdpSocket> {
init();
new_ip_socket(addr, SOCK_DGRAM).and_then(|socket| {
let (raw_addr, raw_addr_length) = socket_addr(&addr);
syscall!(
win_bind(socket, raw_addr.as_ptr(), raw_addr_length,),
PartialEq::eq,
SOCKET_ERROR
)
.map_err(|err| {
// Close the socket if we hit an error, ignoring the error
// from closing since we can't pass back two errors.
let _ = unsafe { closesocket(socket) };
err
})
.map(|_| unsafe { net::UdpSocket::from_raw_socket(socket as StdSocket) })
})
}
pub(crate) fn only_v6(socket: &net::UdpSocket) -> io::Result<bool> {
let mut optval: MaybeUninit<i32> = MaybeUninit::uninit();
let mut optlen = mem::size_of::<i32>() as i32;
syscall!(
getsockopt(
socket.as_raw_socket() as usize,
IPPROTO_IPV6 as i32,
IPV6_V6ONLY as i32,
optval.as_mut_ptr().cast(),
&mut optlen,
),
PartialEq::eq,
SOCKET_ERROR
)?;
debug_assert_eq!(optlen as usize, mem::size_of::<i32>());
// Safety: `getsockopt` initialised `optval` for us.
let optval = unsafe { optval.assume_init() };
Ok(optval != 0)
}
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