597 lines
27 KiB
Plaintext
597 lines
27 KiB
Plaintext
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/**
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* The `node:dgram` module provides an implementation of UDP datagram sockets.
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*
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* ```js
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* import dgram from 'node:dgram';
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*
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* const server = dgram.createSocket('udp4');
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*
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* server.on('error', (err) => {
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* console.error(`server error:\n${err.stack}`);
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* server.close();
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* });
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*
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* server.on('message', (msg, rinfo) => {
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* console.log(`server got: ${msg} from ${rinfo.address}:${rinfo.port}`);
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* });
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*
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* server.on('listening', () => {
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* const address = server.address();
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* console.log(`server listening ${address.address}:${address.port}`);
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* });
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*
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* server.bind(41234);
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* // Prints: server listening 0.0.0.0:41234
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* ```
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* @see [source](https://github.com/nodejs/node/blob/v20.2.0/lib/dgram.js)
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*/
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declare module "dgram" {
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import { AddressInfo } from "node:net";
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import * as dns from "node:dns";
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import { Abortable, EventEmitter } from "node:events";
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interface RemoteInfo {
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address: string;
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family: "IPv4" | "IPv6";
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port: number;
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size: number;
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}
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interface BindOptions {
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port?: number | undefined;
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address?: string | undefined;
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exclusive?: boolean | undefined;
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fd?: number | undefined;
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}
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type SocketType = "udp4" | "udp6";
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interface SocketOptions extends Abortable {
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type: SocketType;
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reuseAddr?: boolean | undefined;
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/**
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* @default false
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*/
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ipv6Only?: boolean | undefined;
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recvBufferSize?: number | undefined;
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sendBufferSize?: number | undefined;
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lookup?:
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| ((
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hostname: string,
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options: dns.LookupOneOptions,
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callback: (err: NodeJS.ErrnoException | null, address: string, family: number) => void,
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) => void)
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| undefined;
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}
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/**
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* Creates a `dgram.Socket` object. Once the socket is created, calling `socket.bind()` will instruct the socket to begin listening for datagram
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* messages. When `address` and `port` are not passed to `socket.bind()` the
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* method will bind the socket to the "all interfaces" address on a random port
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* (it does the right thing for both `udp4` and `udp6` sockets). The bound address
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* and port can be retrieved using `socket.address().address` and `socket.address().port`.
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*
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* If the `signal` option is enabled, calling `.abort()` on the corresponding`AbortController` is similar to calling `.close()` on the socket:
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*
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* ```js
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* const controller = new AbortController();
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* const { signal } = controller;
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* const server = dgram.createSocket({ type: 'udp4', signal });
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* server.on('message', (msg, rinfo) => {
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* console.log(`server got: ${msg} from ${rinfo.address}:${rinfo.port}`);
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* });
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* // Later, when you want to close the server.
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* controller.abort();
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* ```
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* @since v0.11.13
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* @param options Available options are:
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* @param callback Attached as a listener for `'message'` events. Optional.
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*/
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function createSocket(type: SocketType, callback?: (msg: Buffer, rinfo: RemoteInfo) => void): Socket;
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function createSocket(options: SocketOptions, callback?: (msg: Buffer, rinfo: RemoteInfo) => void): Socket;
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/**
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* Encapsulates the datagram functionality.
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*
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* New instances of `dgram.Socket` are created using {@link createSocket}.
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* The `new` keyword is not to be used to create `dgram.Socket` instances.
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* @since v0.1.99
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*/
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class Socket extends EventEmitter {
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/**
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* Tells the kernel to join a multicast group at the given `multicastAddress` and`multicastInterface` using the `IP_ADD_MEMBERSHIP` socket option. If the`multicastInterface` argument is not
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* specified, the operating system will choose
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* one interface and will add membership to it. To add membership to every
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* available interface, call `addMembership` multiple times, once per interface.
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*
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* When called on an unbound socket, this method will implicitly bind to a random
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* port, listening on all interfaces.
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*
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* When sharing a UDP socket across multiple `cluster` workers, the`socket.addMembership()` function must be called only once or an`EADDRINUSE` error will occur:
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*
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* ```js
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* import cluster from 'node:cluster';
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* import dgram from 'node:dgram';
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*
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* if (cluster.isPrimary) {
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* cluster.fork(); // Works ok.
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* cluster.fork(); // Fails with EADDRINUSE.
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* } else {
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* const s = dgram.createSocket('udp4');
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* s.bind(1234, () => {
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* s.addMembership('224.0.0.114');
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* });
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* }
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* ```
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* @since v0.6.9
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*/
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addMembership(multicastAddress: string, multicastInterface?: string): void;
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/**
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* Returns an object containing the address information for a socket.
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* For UDP sockets, this object will contain `address`, `family`, and `port`properties.
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*
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* This method throws `EBADF` if called on an unbound socket.
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* @since v0.1.99
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*/
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address(): AddressInfo;
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/**
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* For UDP sockets, causes the `dgram.Socket` to listen for datagram
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* messages on a named `port` and optional `address`. If `port` is not
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* specified or is `0`, the operating system will attempt to bind to a
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* random port. If `address` is not specified, the operating system will
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* attempt to listen on all addresses. Once binding is complete, a`'listening'` event is emitted and the optional `callback` function is
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* called.
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*
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* Specifying both a `'listening'` event listener and passing a`callback` to the `socket.bind()` method is not harmful but not very
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* useful.
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*
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* A bound datagram socket keeps the Node.js process running to receive
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* datagram messages.
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*
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* If binding fails, an `'error'` event is generated. In rare case (e.g.
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* attempting to bind with a closed socket), an `Error` may be thrown.
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*
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* Example of a UDP server listening on port 41234:
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*
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* ```js
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* import dgram from 'node:dgram';
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*
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* const server = dgram.createSocket('udp4');
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*
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* server.on('error', (err) => {
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* console.error(`server error:\n${err.stack}`);
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* server.close();
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* });
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*
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* server.on('message', (msg, rinfo) => {
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* console.log(`server got: ${msg} from ${rinfo.address}:${rinfo.port}`);
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* });
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*
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* server.on('listening', () => {
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* const address = server.address();
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* console.log(`server listening ${address.address}:${address.port}`);
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* });
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*
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* server.bind(41234);
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* // Prints: server listening 0.0.0.0:41234
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* ```
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* @since v0.1.99
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* @param callback with no parameters. Called when binding is complete.
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*/
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bind(port?: number, address?: string, callback?: () => void): this;
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bind(port?: number, callback?: () => void): this;
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bind(callback?: () => void): this;
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bind(options: BindOptions, callback?: () => void): this;
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/**
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* Close the underlying socket and stop listening for data on it. If a callback is
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* provided, it is added as a listener for the `'close'` event.
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* @since v0.1.99
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* @param callback Called when the socket has been closed.
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*/
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close(callback?: () => void): this;
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/**
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* Associates the `dgram.Socket` to a remote address and port. Every
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* message sent by this handle is automatically sent to that destination. Also,
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* the socket will only receive messages from that remote peer.
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* Trying to call `connect()` on an already connected socket will result
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* in an `ERR_SOCKET_DGRAM_IS_CONNECTED` exception. If `address` is not
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* provided, `'127.0.0.1'` (for `udp4` sockets) or `'::1'` (for `udp6` sockets)
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* will be used by default. Once the connection is complete, a `'connect'` event
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* is emitted and the optional `callback` function is called. In case of failure,
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* the `callback` is called or, failing this, an `'error'` event is emitted.
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* @since v12.0.0
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* @param callback Called when the connection is completed or on error.
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*/
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connect(port: number, address?: string, callback?: () => void): void;
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connect(port: number, callback: () => void): void;
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/**
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* A synchronous function that disassociates a connected `dgram.Socket` from
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* its remote address. Trying to call `disconnect()` on an unbound or already
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* disconnected socket will result in an `ERR_SOCKET_DGRAM_NOT_CONNECTED` exception.
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* @since v12.0.0
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*/
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disconnect(): void;
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/**
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* Instructs the kernel to leave a multicast group at `multicastAddress` using the`IP_DROP_MEMBERSHIP` socket option. This method is automatically called by the
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* kernel when the socket is closed or the process terminates, so most apps will
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* never have reason to call this.
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*
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* If `multicastInterface` is not specified, the operating system will attempt to
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* drop membership on all valid interfaces.
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* @since v0.6.9
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*/
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dropMembership(multicastAddress: string, multicastInterface?: string): void;
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/**
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* This method throws `ERR_SOCKET_BUFFER_SIZE` if called on an unbound socket.
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* @since v8.7.0
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* @return the `SO_RCVBUF` socket receive buffer size in bytes.
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*/
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getRecvBufferSize(): number;
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/**
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* This method throws `ERR_SOCKET_BUFFER_SIZE` if called on an unbound socket.
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* @since v8.7.0
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* @return the `SO_SNDBUF` socket send buffer size in bytes.
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*/
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getSendBufferSize(): number;
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/**
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* @since v18.8.0, v16.19.0
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* @return Number of bytes queued for sending.
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*/
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getSendQueueSize(): number;
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/**
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* @since v18.8.0, v16.19.0
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* @return Number of send requests currently in the queue awaiting to be processed.
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*/
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getSendQueueCount(): number;
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/**
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* By default, binding a socket will cause it to block the Node.js process from
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* exiting as long as the socket is open. The `socket.unref()` method can be used
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* to exclude the socket from the reference counting that keeps the Node.js
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* process active. The `socket.ref()` method adds the socket back to the reference
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* counting and restores the default behavior.
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*
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* Calling `socket.ref()` multiples times will have no additional effect.
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*
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* The `socket.ref()` method returns a reference to the socket so calls can be
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* chained.
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* @since v0.9.1
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*/
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ref(): this;
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/**
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* Returns an object containing the `address`, `family`, and `port` of the remote
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* endpoint. This method throws an `ERR_SOCKET_DGRAM_NOT_CONNECTED` exception
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* if the socket is not connected.
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* @since v12.0.0
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*/
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remoteAddress(): AddressInfo;
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/**
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* Broadcasts a datagram on the socket.
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* For connectionless sockets, the destination `port` and `address` must be
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* specified. Connected sockets, on the other hand, will use their associated
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* remote endpoint, so the `port` and `address` arguments must not be set.
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*
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* The `msg` argument contains the message to be sent.
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* Depending on its type, different behavior can apply. If `msg` is a `Buffer`,
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* any `TypedArray` or a `DataView`,
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* the `offset` and `length` specify the offset within the `Buffer` where the
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* message begins and the number of bytes in the message, respectively.
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* If `msg` is a `String`, then it is automatically converted to a `Buffer`with `'utf8'` encoding. With messages that
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* contain multi-byte characters, `offset` and `length` will be calculated with
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* respect to `byte length` and not the character position.
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* If `msg` is an array, `offset` and `length` must not be specified.
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*
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* The `address` argument is a string. If the value of `address` is a host name,
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* DNS will be used to resolve the address of the host. If `address` is not
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* provided or otherwise nullish, `'127.0.0.1'` (for `udp4` sockets) or `'::1'`(for `udp6` sockets) will be used by default.
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*
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* If the socket has not been previously bound with a call to `bind`, the socket
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* is assigned a random port number and is bound to the "all interfaces" address
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* (`'0.0.0.0'` for `udp4` sockets, `'::0'` for `udp6` sockets.)
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*
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* An optional `callback` function may be specified to as a way of reporting
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* DNS errors or for determining when it is safe to reuse the `buf` object.
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* DNS lookups delay the time to send for at least one tick of the
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* Node.js event loop.
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*
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* The only way to know for sure that the datagram has been sent is by using a`callback`. If an error occurs and a `callback` is given, the error will be
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* passed as the first argument to the `callback`. If a `callback` is not given,
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* the error is emitted as an `'error'` event on the `socket` object.
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*
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* Offset and length are optional but both _must_ be set if either are used.
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* They are supported only when the first argument is a `Buffer`, a `TypedArray`,
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* or a `DataView`.
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*
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* This method throws `ERR_SOCKET_BAD_PORT` if called on an unbound socket.
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*
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* Example of sending a UDP packet to a port on `localhost`;
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*
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* ```js
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* import dgram from 'node:dgram';
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* import { Buffer } from 'node:buffer';
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*
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* const message = Buffer.from('Some bytes');
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* const client = dgram.createSocket('udp4');
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* client.send(message, 41234, 'localhost', (err) => {
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* client.close();
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* });
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* ```
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*
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* Example of sending a UDP packet composed of multiple buffers to a port on`127.0.0.1`;
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*
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* ```js
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* import dgram from 'node:dgram';
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* import { Buffer } from 'node:buffer';
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*
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* const buf1 = Buffer.from('Some ');
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* const buf2 = Buffer.from('bytes');
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* const client = dgram.createSocket('udp4');
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* client.send([buf1, buf2], 41234, (err) => {
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* client.close();
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* });
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* ```
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*
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* Sending multiple buffers might be faster or slower depending on the
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* application and operating system. Run benchmarks to
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* determine the optimal strategy on a case-by-case basis. Generally speaking,
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* however, sending multiple buffers is faster.
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*
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* Example of sending a UDP packet using a socket connected to a port on`localhost`:
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*
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* ```js
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* import dgram from 'node:dgram';
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* import { Buffer } from 'node:buffer';
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*
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* const message = Buffer.from('Some bytes');
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* const client = dgram.createSocket('udp4');
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* client.connect(41234, 'localhost', (err) => {
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* client.send(message, (err) => {
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* client.close();
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* });
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* });
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* ```
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* @since v0.1.99
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* @param msg Message to be sent.
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* @param offset Offset in the buffer where the message starts.
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* @param length Number of bytes in the message.
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* @param port Destination port.
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* @param address Destination host name or IP address.
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* @param callback Called when the message has been sent.
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*/
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send(
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msg: string | Uint8Array | readonly any[],
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port?: number,
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address?: string,
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callback?: (error: Error | null, bytes: number) => void,
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): void;
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send(
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msg: string | Uint8Array | readonly any[],
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port?: number,
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callback?: (error: Error | null, bytes: number) => void,
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): void;
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send(
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msg: string | Uint8Array | readonly any[],
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callback?: (error: Error | null, bytes: number) => void,
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): void;
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send(
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msg: string | Uint8Array,
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offset: number,
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length: number,
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port?: number,
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address?: string,
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callback?: (error: Error | null, bytes: number) => void,
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): void;
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send(
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msg: string | Uint8Array,
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offset: number,
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length: number,
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port?: number,
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callback?: (error: Error | null, bytes: number) => void,
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): void;
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send(
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msg: string | Uint8Array,
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offset: number,
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length: number,
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||
|
callback?: (error: Error | null, bytes: number) => void,
|
||
|
): void;
|
||
|
/**
|
||
|
* Sets or clears the `SO_BROADCAST` socket option. When set to `true`, UDP
|
||
|
* packets may be sent to a local interface's broadcast address.
|
||
|
*
|
||
|
* This method throws `EBADF` if called on an unbound socket.
|
||
|
* @since v0.6.9
|
||
|
*/
|
||
|
setBroadcast(flag: boolean): void;
|
||
|
/**
|
||
|
* _All references to scope in this section are referring to [IPv6 Zone Indices](https://en.wikipedia.org/wiki/IPv6_address#Scoped_literal_IPv6_addresses), which are defined by [RFC
|
||
|
* 4007](https://tools.ietf.org/html/rfc4007). In string form, an IP_
|
||
|
* _with a scope index is written as `'IP%scope'` where scope is an interface name_
|
||
|
* _or interface number._
|
||
|
*
|
||
|
* Sets the default outgoing multicast interface of the socket to a chosen
|
||
|
* interface or back to system interface selection. The `multicastInterface` must
|
||
|
* be a valid string representation of an IP from the socket's family.
|
||
|
*
|
||
|
* For IPv4 sockets, this should be the IP configured for the desired physical
|
||
|
* interface. All packets sent to multicast on the socket will be sent on the
|
||
|
* interface determined by the most recent successful use of this call.
|
||
|
*
|
||
|
* For IPv6 sockets, `multicastInterface` should include a scope to indicate the
|
||
|
* interface as in the examples that follow. In IPv6, individual `send` calls can
|
||
|
* also use explicit scope in addresses, so only packets sent to a multicast
|
||
|
* address without specifying an explicit scope are affected by the most recent
|
||
|
* successful use of this call.
|
||
|
*
|
||
|
* This method throws `EBADF` if called on an unbound socket.
|
||
|
*
|
||
|
* #### Example: IPv6 outgoing multicast interface
|
||
|
*
|
||
|
* On most systems, where scope format uses the interface name:
|
||
|
*
|
||
|
* ```js
|
||
|
* const socket = dgram.createSocket('udp6');
|
||
|
*
|
||
|
* socket.bind(1234, () => {
|
||
|
* socket.setMulticastInterface('::%eth1');
|
||
|
* });
|
||
|
* ```
|
||
|
*
|
||
|
* On Windows, where scope format uses an interface number:
|
||
|
*
|
||
|
* ```js
|
||
|
* const socket = dgram.createSocket('udp6');
|
||
|
*
|
||
|
* socket.bind(1234, () => {
|
||
|
* socket.setMulticastInterface('::%2');
|
||
|
* });
|
||
|
* ```
|
||
|
*
|
||
|
* #### Example: IPv4 outgoing multicast interface
|
||
|
*
|
||
|
* All systems use an IP of the host on the desired physical interface:
|
||
|
*
|
||
|
* ```js
|
||
|
* const socket = dgram.createSocket('udp4');
|
||
|
*
|
||
|
* socket.bind(1234, () => {
|
||
|
* socket.setMulticastInterface('10.0.0.2');
|
||
|
* });
|
||
|
* ```
|
||
|
* @since v8.6.0
|
||
|
*/
|
||
|
setMulticastInterface(multicastInterface: string): void;
|
||
|
/**
|
||
|
* Sets or clears the `IP_MULTICAST_LOOP` socket option. When set to `true`,
|
||
|
* multicast packets will also be received on the local interface.
|
||
|
*
|
||
|
* This method throws `EBADF` if called on an unbound socket.
|
||
|
* @since v0.3.8
|
||
|
*/
|
||
|
setMulticastLoopback(flag: boolean): boolean;
|
||
|
/**
|
||
|
* Sets the `IP_MULTICAST_TTL` socket option. While TTL generally stands for
|
||
|
* "Time to Live", in this context it specifies the number of IP hops that a
|
||
|
* packet is allowed to travel through, specifically for multicast traffic. Each
|
||
|
* router or gateway that forwards a packet decrements the TTL. If the TTL is
|
||
|
* decremented to 0 by a router, it will not be forwarded.
|
||
|
*
|
||
|
* The `ttl` argument may be between 0 and 255\. The default on most systems is `1`.
|
||
|
*
|
||
|
* This method throws `EBADF` if called on an unbound socket.
|
||
|
* @since v0.3.8
|
||
|
*/
|
||
|
setMulticastTTL(ttl: number): number;
|
||
|
/**
|
||
|
* Sets the `SO_RCVBUF` socket option. Sets the maximum socket receive buffer
|
||
|
* in bytes.
|
||
|
*
|
||
|
* This method throws `ERR_SOCKET_BUFFER_SIZE` if called on an unbound socket.
|
||
|
* @since v8.7.0
|
||
|
*/
|
||
|
setRecvBufferSize(size: number): void;
|
||
|
/**
|
||
|
* Sets the `SO_SNDBUF` socket option. Sets the maximum socket send buffer
|
||
|
* in bytes.
|
||
|
*
|
||
|
* This method throws `ERR_SOCKET_BUFFER_SIZE` if called on an unbound socket.
|
||
|
* @since v8.7.0
|
||
|
*/
|
||
|
setSendBufferSize(size: number): void;
|
||
|
/**
|
||
|
* Sets the `IP_TTL` socket option. While TTL generally stands for "Time to Live",
|
||
|
* in this context it specifies the number of IP hops that a packet is allowed to
|
||
|
* travel through. Each router or gateway that forwards a packet decrements the
|
||
|
* TTL. If the TTL is decremented to 0 by a router, it will not be forwarded.
|
||
|
* Changing TTL values is typically done for network probes or when multicasting.
|
||
|
*
|
||
|
* The `ttl` argument may be between 1 and 255\. The default on most systems
|
||
|
* is 64.
|
||
|
*
|
||
|
* This method throws `EBADF` if called on an unbound socket.
|
||
|
* @since v0.1.101
|
||
|
*/
|
||
|
setTTL(ttl: number): number;
|
||
|
/**
|
||
|
* By default, binding a socket will cause it to block the Node.js process from
|
||
|
* exiting as long as the socket is open. The `socket.unref()` method can be used
|
||
|
* to exclude the socket from the reference counting that keeps the Node.js
|
||
|
* process active, allowing the process to exit even if the socket is still
|
||
|
* listening.
|
||
|
*
|
||
|
* Calling `socket.unref()` multiple times will have no additional effect.
|
||
|
*
|
||
|
* The `socket.unref()` method returns a reference to the socket so calls can be
|
||
|
* chained.
|
||
|
* @since v0.9.1
|
||
|
*/
|
||
|
unref(): this;
|
||
|
/**
|
||
|
* Tells the kernel to join a source-specific multicast channel at the given`sourceAddress` and `groupAddress`, using the `multicastInterface` with the`IP_ADD_SOURCE_MEMBERSHIP` socket
|
||
|
* option. If the `multicastInterface` argument
|
||
|
* is not specified, the operating system will choose one interface and will add
|
||
|
* membership to it. To add membership to every available interface, call`socket.addSourceSpecificMembership()` multiple times, once per interface.
|
||
|
*
|
||
|
* When called on an unbound socket, this method will implicitly bind to a random
|
||
|
* port, listening on all interfaces.
|
||
|
* @since v13.1.0, v12.16.0
|
||
|
*/
|
||
|
addSourceSpecificMembership(sourceAddress: string, groupAddress: string, multicastInterface?: string): void;
|
||
|
/**
|
||
|
* Instructs the kernel to leave a source-specific multicast channel at the given`sourceAddress` and `groupAddress` using the `IP_DROP_SOURCE_MEMBERSHIP`socket option. This method is
|
||
|
* automatically called by the kernel when the
|
||
|
* socket is closed or the process terminates, so most apps will never have
|
||
|
* reason to call this.
|
||
|
*
|
||
|
* If `multicastInterface` is not specified, the operating system will attempt to
|
||
|
* drop membership on all valid interfaces.
|
||
|
* @since v13.1.0, v12.16.0
|
||
|
*/
|
||
|
dropSourceSpecificMembership(sourceAddress: string, groupAddress: string, multicastInterface?: string): void;
|
||
|
/**
|
||
|
* events.EventEmitter
|
||
|
* 1. close
|
||
|
* 2. connect
|
||
|
* 3. error
|
||
|
* 4. listening
|
||
|
* 5. message
|
||
|
*/
|
||
|
addListener(event: string, listener: (...args: any[]) => void): this;
|
||
|
addListener(event: "close", listener: () => void): this;
|
||
|
addListener(event: "connect", listener: () => void): this;
|
||
|
addListener(event: "error", listener: (err: Error) => void): this;
|
||
|
addListener(event: "listening", listener: () => void): this;
|
||
|
addListener(event: "message", listener: (msg: Buffer, rinfo: RemoteInfo) => void): this;
|
||
|
emit(event: string | symbol, ...args: any[]): boolean;
|
||
|
emit(event: "close"): boolean;
|
||
|
emit(event: "connect"): boolean;
|
||
|
emit(event: "error", err: Error): boolean;
|
||
|
emit(event: "listening"): boolean;
|
||
|
emit(event: "message", msg: Buffer, rinfo: RemoteInfo): boolean;
|
||
|
on(event: string, listener: (...args: any[]) => void): this;
|
||
|
on(event: "close", listener: () => void): this;
|
||
|
on(event: "connect", listener: () => void): this;
|
||
|
on(event: "error", listener: (err: Error) => void): this;
|
||
|
on(event: "listening", listener: () => void): this;
|
||
|
on(event: "message", listener: (msg: Buffer, rinfo: RemoteInfo) => void): this;
|
||
|
once(event: string, listener: (...args: any[]) => void): this;
|
||
|
once(event: "close", listener: () => void): this;
|
||
|
once(event: "connect", listener: () => void): this;
|
||
|
once(event: "error", listener: (err: Error) => void): this;
|
||
|
once(event: "listening", listener: () => void): this;
|
||
|
once(event: "message", listener: (msg: Buffer, rinfo: RemoteInfo) => void): this;
|
||
|
prependListener(event: string, listener: (...args: any[]) => void): this;
|
||
|
prependListener(event: "close", listener: () => void): this;
|
||
|
prependListener(event: "connect", listener: () => void): this;
|
||
|
prependListener(event: "error", listener: (err: Error) => void): this;
|
||
|
prependListener(event: "listening", listener: () => void): this;
|
||
|
prependListener(event: "message", listener: (msg: Buffer, rinfo: RemoteInfo) => void): this;
|
||
|
prependOnceListener(event: string, listener: (...args: any[]) => void): this;
|
||
|
prependOnceListener(event: "close", listener: () => void): this;
|
||
|
prependOnceListener(event: "connect", listener: () => void): this;
|
||
|
prependOnceListener(event: "error", listener: (err: Error) => void): this;
|
||
|
prependOnceListener(event: "listening", listener: () => void): this;
|
||
|
prependOnceListener(event: "message", listener: (msg: Buffer, rinfo: RemoteInfo) => void): this;
|
||
|
/**
|
||
|
* Calls `socket.close()` and returns a promise that fulfills when the socket has closed.
|
||
|
* @since v20.5.0
|
||
|
*/
|
||
|
[Symbol.asyncDispose](): Promise<void>;
|
||
|
}
|
||
|
}
|
||
|
declare module "node:dgram" {
|
||
|
export * from "dgram";
|
||
|
}
|