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Struct async_std::net::UdpSocket

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pub struct UdpSocket { /* private fields */ }
Expand description

A UDP socket.

After creating a UdpSocket by binding 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.

Examples

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?;
}

Implementations

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.

Examples
use async_std::net::UdpSocket;

let socket = UdpSocket::bind("127.0.0.1:0").await?;

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
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()?;

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
use async_std::net::UdpSocket;

let socket = UdpSocket::bind("127.0.0.1:0").await?;
let addr = socket.local_addr()?;

Sends data on the socket to the given address.

On success, returns the number of bytes written.

Examples
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);

Receives data from the socket.

On success, returns the number of bytes read and the origin.

Examples
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);

Receives data from socket without removing it from the queue.

On success, returns the number of bytes peeked and the origin.

Examples
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);

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.

Examples
use async_std::net::UdpSocket;

let socket = UdpSocket::bind("127.0.0.1:0").await?;
socket.connect("127.0.0.1:8080").await?;

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.

Examples
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);

Receives data from the socket.

On success, returns the number of bytes read.

Examples
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);

Receives data from the socket without removing it from the queue.

On success, returns the number of bytes peeked.

Examples
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);

Gets the value of the SO_BROADCAST option for this socket.

For more information about this option, see set_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.

Gets the value of the IP_MULTICAST_LOOP option for this socket.

For more information about this option, see set_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.

Gets the value of the IP_MULTICAST_TTL option for this socket.

For more information about this option, see set_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.

Gets the value of the IPV6_MULTICAST_LOOP option for this socket.

For more information about this option, see set_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.

Gets the value of the IP_TTL option for this socket.

For more information about this option, see set_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.

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
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)?;

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
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)?;

Executes an operation of the IP_DROP_MEMBERSHIP type.

For more information about this option, see join_multicast_v4.

Executes an operation of the IPV6_DROP_MEMBERSHIP type.

For more information about this option, see join_multicast_v6.

Trait Implementations

Extracts the raw file descriptor. Read more

Extracts the underlying raw socket from this object.

Formats the value using the given formatter. Read more

Converts a std::net::UdpSocket into its asynchronous equivalent.

Constructs a new instance of Self from the given raw file descriptor. Read more

Creates a new I/O object from the given raw socket. Read more

Consumes this object, returning the raw underlying file descriptor. Read more

Consumes this object, returning the raw underlying socket. Read more

Converts a UdpSocket into its synchronous equivalent.

The type returned in the event of a conversion error.

Auto Trait Implementations

Blanket Implementations

Gets the TypeId of self. Read more

Immutably borrows from an owned value. Read more

Mutably borrows from an owned value. Read more

Returns the argument unchanged.

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

The type returned in the event of a conversion error.

Performs the conversion.

The type returned in the event of a conversion error.

Performs the conversion.