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use std::io;
use std::net::SocketAddr;
use std::net::{Ipv4Addr, Ipv6Addr};
use async_io::Async;
use crate::net::ToSocketAddrs;
use crate::utils::Context as _;
/// A UDP socket.
///
/// After creating a `UdpSocket` by [`bind`]ing it to a socket address, data can be [sent to] and
/// [received from] any other socket address.
///
/// As stated in the User Datagram Protocol's specification in [IETF RFC 768], UDP is an unordered,
/// unreliable protocol. Refer to [`TcpListener`] and [`TcpStream`] for async TCP primitives.
///
/// This type is an async version of [`std::net::UdpSocket`].
///
/// [`bind`]: #method.bind
/// [received from]: #method.recv_from
/// [sent to]: #method.send_to
/// [`TcpListener`]: struct.TcpListener.html
/// [`TcpStream`]: struct.TcpStream.html
/// [`std::net`]: https://doc.rust-lang.org/std/net/index.html
/// [IETF RFC 768]: https://tools.ietf.org/html/rfc768
/// [`std::net::UdpSocket`]: https://doc.rust-lang.org/std/net/struct.UdpSocket.html
///
/// ## Examples
///
/// ```no_run
/// # fn main() -> std::io::Result<()> { async_std::task::block_on(async {
/// #
/// use async_std::net::UdpSocket;
///
/// let socket = UdpSocket::bind("127.0.0.1:8080").await?;
/// let mut buf = vec![0u8; 1024];
///
/// loop {
/// let (n, peer) = socket.recv_from(&mut buf).await?;
/// socket.send_to(&buf[..n], &peer).await?;
/// }
/// #
/// # }) }
/// ```
#[derive(Debug)]
pub struct UdpSocket {
watcher: Async<std::net::UdpSocket>,
}
impl UdpSocket {
/// Creates a UDP socket from the given address.
///
/// Binding with a port number of 0 will request that the OS assigns a port to this socket. The
/// port allocated can be queried via the [`local_addr`] method.
///
/// [`local_addr`]: #method.local_addr
///
/// # Examples
///
/// ```no_run
/// # fn main() -> std::io::Result<()> { async_std::task::block_on(async {
/// #
/// use async_std::net::UdpSocket;
///
/// let socket = UdpSocket::bind("127.0.0.1:0").await?;
/// #
/// # Ok(()) }) }
/// ```
pub async fn bind<A: ToSocketAddrs>(addrs: A) -> io::Result<UdpSocket> {
let mut last_err = None;
let addrs = addrs.to_socket_addrs().await?;
for addr in addrs {
match Async::<std::net::UdpSocket>::bind(addr) {
Ok(socket) => {
return Ok(UdpSocket { watcher: socket });
}
Err(err) => last_err = Some(err),
}
}
Err(last_err.unwrap_or_else(|| {
io::Error::new(
io::ErrorKind::InvalidInput,
"could not resolve to any addresses",
)
}))
}
/// Returns the peer address that this listener is connected to.
///
/// This can be useful, for example, when connect to port 0 to figure out which port was
/// actually connected.
///
/// # Examples
///
/// ```no_run
/// # fn main() -> std::io::Result<()> { async_std::task::block_on(async {
/// #
/// use async_std::net::UdpSocket;
///
/// let socket1 = UdpSocket::bind("127.0.0.1:0").await?;
/// let socket2 = UdpSocket::bind("127.0.0.1:0").await?;
/// socket1.connect(socket2.local_addr()?).await?;
/// let addr = socket1.peer_addr()?;
/// #
/// # Ok(()) }) }
/// ```
pub fn peer_addr(&self) -> io::Result<SocketAddr> {
self.watcher
.get_ref()
.peer_addr()
.context(|| String::from("could not get peer address"))
}
/// Returns the local address that this listener is bound to.
///
/// This can be useful, for example, when binding to port 0 to figure out which port was
/// actually bound.
///
/// # Examples
///
/// ```no_run
/// # fn main() -> std::io::Result<()> { async_std::task::block_on(async {
/// #
/// use async_std::net::UdpSocket;
///
/// let socket = UdpSocket::bind("127.0.0.1:0").await?;
/// let addr = socket.local_addr()?;
/// #
/// # Ok(()) }) }
/// ```
pub fn local_addr(&self) -> io::Result<SocketAddr> {
self.watcher
.get_ref()
.local_addr()
.context(|| String::from("could not get local address"))
}
/// Sends data on the socket to the given address.
///
/// On success, returns the number of bytes written.
///
/// # Examples
///
/// ```no_run
/// # fn main() -> std::io::Result<()> { async_std::task::block_on(async {
/// #
/// use async_std::net::UdpSocket;
///
/// const THE_MERCHANT_OF_VENICE: &[u8] = b"
/// If you prick us, do we not bleed?
/// If you tickle us, do we not laugh?
/// If you poison us, do we not die?
/// And if you wrong us, shall we not revenge?
/// ";
///
/// let socket = UdpSocket::bind("127.0.0.1:0").await?;
///
/// let addr = "127.0.0.1:7878";
/// let sent = socket.send_to(THE_MERCHANT_OF_VENICE, &addr).await?;
/// println!("Sent {} bytes to {}", sent, addr);
/// #
/// # Ok(()) }) }
/// ```
pub async fn send_to<A: ToSocketAddrs>(&self, buf: &[u8], addrs: A) -> io::Result<usize> {
let addr = match addrs.to_socket_addrs().await?.next() {
Some(addr) => addr,
None => {
return Err(io::Error::new(
io::ErrorKind::InvalidInput,
"no addresses to send data to",
));
}
};
self.watcher
.send_to(buf, addr)
.await
.context(|| format!("could not send packet to {}", addr))
}
/// Receives data from the socket.
///
/// On success, returns the number of bytes read and the origin.
///
/// # Examples
///
/// ```no_run
/// # fn main() -> std::io::Result<()> { async_std::task::block_on(async {
/// #
/// use async_std::net::UdpSocket;
///
/// let socket = UdpSocket::bind("127.0.0.1:0").await?;
///
/// let mut buf = vec![0; 1024];
/// let (n, peer) = socket.recv_from(&mut buf).await?;
/// println!("Received {} bytes from {}", n, peer);
/// #
/// # Ok(()) }) }
/// ```
pub async fn recv_from(&self, buf: &mut [u8]) -> io::Result<(usize, SocketAddr)> {
self.watcher.recv_from(buf).await
}
/// Receives data from socket without removing it from the queue.
///
/// On success, returns the number of bytes peeked and the origin.
///
/// # Examples
///
/// ```no_run
/// # fn main() -> std::io::Result<()> { async_std::task::block_on(async {
/// #
/// use async_std::net::UdpSocket;
///
/// let socket = UdpSocket::bind("127.0.0.1:0").await?;
///
/// let mut buf = vec![0; 1024];
/// let (n, peer) = socket.peek_from(&mut buf).await?;
/// println!("Peeked {} bytes from {}", n, peer);
/// #
/// # Ok (()) }) }
/// ```
pub async fn peek_from(&self, buf: &mut [u8]) -> io::Result<(usize, SocketAddr)> {
self.watcher.peek_from(buf).await
}
/// Connects the UDP socket to a remote address.
///
/// When connected, methods [`send`] and [`recv`] will use the specified address for sending
/// and receiving messages. Additionally, a filter will be applied to [`recv_from`] so that it
/// only receives messages from that same address.
///
/// [`send`]: #method.send
/// [`recv`]: #method.recv
/// [`recv_from`]: #method.recv_from
///
/// # Examples
///
/// ```no_run
/// # fn main() -> std::io::Result<()> { async_std::task::block_on(async {
/// #
/// use async_std::net::UdpSocket;
///
/// let socket = UdpSocket::bind("127.0.0.1:0").await?;
/// socket.connect("127.0.0.1:8080").await?;
/// #
/// # Ok(()) }) }
/// ```
pub async fn connect<A: ToSocketAddrs>(&self, addrs: A) -> io::Result<()> {
let mut last_err = None;
let addrs = addrs
.to_socket_addrs()
.await
.context(|| String::from("could not resolve addresses"))?;
for addr in addrs {
// TODO(stjepang): connect on the blocking pool
match self.watcher.get_ref().connect(addr) {
Ok(()) => return Ok(()),
Err(err) => last_err = Some(err),
}
}
Err(last_err.unwrap_or_else(|| {
io::Error::new(
io::ErrorKind::InvalidInput,
"could not resolve to any addresses",
)
}))
}
/// Sends data on the socket to the remote address to which it is connected.
///
/// The [`connect`] method will connect this socket to a remote address.
/// This method will fail if the socket is not connected.
///
/// [`connect`]: #method.connect
///
/// # Examples
///
/// ```no_run
/// # fn main() -> std::io::Result<()> { async_std::task::block_on(async {
/// #
/// use async_std::net::UdpSocket;
///
/// let socket = UdpSocket::bind("127.0.0.1:34254").await?;
/// socket.connect("127.0.0.1:8080").await?;
/// let bytes = socket.send(b"Hi there!").await?;
///
/// println!("Sent {} bytes", bytes);
/// #
/// # Ok(()) }) }
/// ```
pub async fn send(&self, buf: &[u8]) -> io::Result<usize> {
self.watcher.send(buf).await
}
/// Receives data from the socket.
///
/// On success, returns the number of bytes read.
///
/// # Examples
///
/// ```no_run
/// # fn main() -> std::io::Result<()> { async_std::task::block_on(async {
/// #
/// use async_std::net::UdpSocket;
///
/// let socket = UdpSocket::bind("127.0.0.1:0").await?;
/// socket.connect("127.0.0.1:8080").await?;
///
/// let mut buf = vec![0; 1024];
/// let n = socket.recv(&mut buf).await?;
/// println!("Received {} bytes", n);
/// #
/// # Ok(()) }) }
/// ```
pub async fn recv(&self, buf: &mut [u8]) -> io::Result<usize> {
self.watcher.recv(buf).await
}
/// Receives data from the socket without removing it from the queue.
///
/// On success, returns the number of bytes peeked.
///
/// # Examples
///
/// ```no_run
/// # fn main() -> std::io::Result<()> { async_std::task::block_on(async {
/// #
/// use async_std::net::UdpSocket;
///
/// let socket = UdpSocket::bind("127.0.0.1:0").await?;
/// socket.connect("127.0.0.1:8080").await?;
///
/// let mut buf = vec![0; 1024];
/// let n = socket.peek(&mut buf).await?;
/// println!("Peeked {} bytes", n);
/// #
/// # Ok(()) }) }
/// ```
pub async fn peek(&self, buf: &mut [u8]) -> io::Result<usize> {
self.watcher.peek(buf).await
}
/// Gets the value of the `SO_BROADCAST` option for this socket.
///
/// For more information about this option, see [`set_broadcast`].
///
/// [`set_broadcast`]: #method.set_broadcast
pub fn broadcast(&self) -> io::Result<bool> {
self.watcher.get_ref().broadcast()
}
/// Sets the value of the `SO_BROADCAST` option for this socket.
///
/// When enabled, this socket is allowed to send packets to a broadcast address.
pub fn set_broadcast(&self, on: bool) -> io::Result<()> {
self.watcher.get_ref().set_broadcast(on)
}
/// Gets the value of the `IP_MULTICAST_LOOP` option for this socket.
///
/// For more information about this option, see [`set_multicast_loop_v4`].
///
/// [`set_multicast_loop_v4`]: #method.set_multicast_loop_v4
pub fn multicast_loop_v4(&self) -> io::Result<bool> {
self.watcher.get_ref().multicast_loop_v4()
}
/// Sets the value of the `IP_MULTICAST_LOOP` option for this socket.
///
/// If enabled, multicast packets will be looped back to the local socket.
///
/// # Note
///
/// This may not have any affect on IPv6 sockets.
pub fn set_multicast_loop_v4(&self, on: bool) -> io::Result<()> {
self.watcher.get_ref().set_multicast_loop_v4(on)
}
/// Gets the value of the `IP_MULTICAST_TTL` option for this socket.
///
/// For more information about this option, see [`set_multicast_ttl_v4`].
///
/// [`set_multicast_ttl_v4`]: #method.set_multicast_ttl_v4
pub fn multicast_ttl_v4(&self) -> io::Result<u32> {
self.watcher.get_ref().multicast_ttl_v4()
}
/// Sets the value of the `IP_MULTICAST_TTL` option for this socket.
///
/// Indicates the time-to-live value of outgoing multicast packets for this socket. The default
/// value is 1 which means that multicast packets don't leave the local network unless
/// explicitly requested.
///
/// # Note
///
/// This may not have any affect on IPv6 sockets.
pub fn set_multicast_ttl_v4(&self, ttl: u32) -> io::Result<()> {
self.watcher.get_ref().set_multicast_ttl_v4(ttl)
}
/// Gets the value of the `IPV6_MULTICAST_LOOP` option for this socket.
///
/// For more information about this option, see [`set_multicast_loop_v6`].
///
/// [`set_multicast_loop_v6`]: #method.set_multicast_loop_v6
pub fn multicast_loop_v6(&self) -> io::Result<bool> {
self.watcher.get_ref().multicast_loop_v6()
}
/// Sets the value of the `IPV6_MULTICAST_LOOP` option for this socket.
///
/// Controls whether this socket sees the multicast packets it sends itself.
///
/// # Note
///
/// This may not have any affect on IPv4 sockets.
pub fn set_multicast_loop_v6(&self, on: bool) -> io::Result<()> {
self.watcher.get_ref().set_multicast_loop_v6(on)
}
/// Gets the value of the `IP_TTL` option for this socket.
///
/// For more information about this option, see [`set_ttl`].
///
/// [`set_ttl`]: #method.set_ttl
pub fn ttl(&self) -> io::Result<u32> {
self.watcher.get_ref().ttl()
}
/// Sets the value for the `IP_TTL` option on this socket.
///
/// This value sets the time-to-live field that is used in every packet sent
/// from this socket.
pub fn set_ttl(&self, ttl: u32) -> io::Result<()> {
self.watcher.get_ref().set_ttl(ttl)
}
/// Executes an operation of the `IP_ADD_MEMBERSHIP` type.
///
/// This method specifies a new multicast group for this socket to join. The address must be
/// a valid multicast address, and `interface` is the address of the local interface with which
/// the system should join the multicast group. If it's equal to `INADDR_ANY` then an
/// appropriate interface is chosen by the system.
///
/// # Examples
///
/// ```no_run
/// # fn main() -> std::io::Result<()> { async_std::task::block_on(async {
/// #
/// use std::net::Ipv4Addr;
///
/// use async_std::net::UdpSocket;
///
/// let interface = Ipv4Addr::new(0, 0, 0, 0);
/// let mdns_addr = Ipv4Addr::new(224, 0, 0, 123);
///
/// let socket = UdpSocket::bind("127.0.0.1:0").await?;
/// socket.join_multicast_v4(mdns_addr, interface)?;
/// #
/// # Ok(()) }) }
/// ```
pub fn join_multicast_v4(&self, multiaddr: Ipv4Addr, interface: Ipv4Addr) -> io::Result<()> {
self.watcher
.get_ref()
.join_multicast_v4(&multiaddr, &interface)
}
/// Executes an operation of the `IPV6_ADD_MEMBERSHIP` type.
///
/// This method specifies a new multicast group for this socket to join. The address must be
/// a valid multicast address, and `interface` is the index of the interface to join/leave (or
/// 0 to indicate any interface).
///
/// # Examples
///
/// ```no_run
/// # fn main() -> std::io::Result<()> { async_std::task::block_on(async {
/// #
/// use std::net::{Ipv6Addr, SocketAddr};
///
/// use async_std::net::UdpSocket;
///
/// let socket_addr = SocketAddr::new(Ipv6Addr::new(0, 0, 0, 0, 0, 0, 0, 0).into(), 0);
/// let mdns_addr = Ipv6Addr::new(0xFF02, 0, 0, 0, 0, 0, 0, 0x0123);
/// let socket = UdpSocket::bind(&socket_addr).await?;
///
/// socket.join_multicast_v6(&mdns_addr, 0)?;
/// #
/// # Ok(()) }) }
/// ```
pub fn join_multicast_v6(&self, multiaddr: &Ipv6Addr, interface: u32) -> io::Result<()> {
self.watcher
.get_ref()
.join_multicast_v6(multiaddr, interface)
}
/// Executes an operation of the `IP_DROP_MEMBERSHIP` type.
///
/// For more information about this option, see [`join_multicast_v4`].
///
/// [`join_multicast_v4`]: #method.join_multicast_v4
pub fn leave_multicast_v4(&self, multiaddr: Ipv4Addr, interface: Ipv4Addr) -> io::Result<()> {
self.watcher
.get_ref()
.leave_multicast_v4(&multiaddr, &interface)
}
/// Executes an operation of the `IPV6_DROP_MEMBERSHIP` type.
///
/// For more information about this option, see [`join_multicast_v6`].
///
/// [`join_multicast_v6`]: #method.join_multicast_v6
pub fn leave_multicast_v6(&self, multiaddr: &Ipv6Addr, interface: u32) -> io::Result<()> {
self.watcher
.get_ref()
.leave_multicast_v6(multiaddr, interface)
}
}
impl From<std::net::UdpSocket> for UdpSocket {
/// Converts a `std::net::UdpSocket` into its asynchronous equivalent.
fn from(socket: std::net::UdpSocket) -> UdpSocket {
UdpSocket {
watcher: Async::new(socket).expect("UdpSocket is known to be good"),
}
}
}
cfg_unix! {
use crate::os::unix::io::{AsRawFd, FromRawFd, IntoRawFd, RawFd};
impl AsRawFd for UdpSocket {
fn as_raw_fd(&self) -> RawFd {
self.watcher.get_ref().as_raw_fd()
}
}
impl FromRawFd for UdpSocket {
unsafe fn from_raw_fd(fd: RawFd) -> UdpSocket {
std::net::UdpSocket::from_raw_fd(fd).into()
}
}
impl IntoRawFd for UdpSocket {
fn into_raw_fd(self) -> RawFd {
self.watcher.into_inner().unwrap().into_raw_fd()
}
}
}
cfg_windows! {
use crate::os::windows::io::{
RawSocket, AsRawSocket, IntoRawSocket, FromRawSocket
};
impl AsRawSocket for UdpSocket {
fn as_raw_socket(&self) -> RawSocket {
self.watcher.get_ref().as_raw_socket()
}
}
impl FromRawSocket for UdpSocket {
unsafe fn from_raw_socket(handle: RawSocket) -> UdpSocket {
std::net::UdpSocket::from_raw_socket(handle).into()
}
}
impl IntoRawSocket for UdpSocket {
fn into_raw_socket(self) -> RawSocket {
self.watcher.into_inner().unwrap().into_raw_socket()
}
}
}