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/**
* The `node:dgram` module provides an implementation of UDP datagram sockets.
*
* ```js
* import dgram from 'node:dgram';
*
* const server = dgram.createSocket('udp4');
*
* server.on('error', (err) => {
* console.error(`server error:\n${err.stack}`);
* server.close();
* });
*
* server.on('message', (msg, rinfo) => {
* console.log(`server got: ${msg} from ${rinfo.address}:${rinfo.port}`);
* });
*
* server.on('listening', () => {
* const address = server.address();
* console.log(`server listening ${address.address}:${address.port}`);
* });
*
* server.bind(41234);
* // Prints: server listening 0.0.0.0:41234
* ```
* @see [source](https://github.com/nodejs/node/blob/v22.x/lib/dgram.js)
*/
declare module "dgram" {
import { AddressInfo, BlockList } from "node:net";
import * as dns from "node:dns";
import { Abortable, EventEmitter } from "node:events";
interface RemoteInfo {
address: string;
family: "IPv4" | "IPv6";
port: number;
size: number;
}
interface BindOptions {
port?: number | undefined;
address?: string | undefined;
exclusive?: boolean | undefined;
fd?: number | undefined;
}
type SocketType = "udp4" | "udp6";
interface SocketOptions extends Abortable {
type: SocketType;
reuseAddr?: boolean | undefined;
reusePort?: boolean | undefined;
/**
* @default false
*/
ipv6Only?: boolean | undefined;
recvBufferSize?: number | undefined;
sendBufferSize?: number | undefined;
lookup?:
| ((
hostname: string,
options: dns.LookupOneOptions,
callback: (err: NodeJS.ErrnoException | null, address: string, family: number) => void,
) => void)
| undefined;
receiveBlockList?: BlockList | undefined;
sendBlockList?: BlockList | undefined;
}
/**
* Creates a `dgram.Socket` object. Once the socket is created, calling `socket.bind()` will instruct the socket to begin listening for datagram
* messages. When `address` and `port` are not passed to `socket.bind()` the
* method will bind the socket to the "all interfaces" address on a random port
* (it does the right thing for both `udp4` and `udp6` sockets). The bound address
* and port can be retrieved using `socket.address().address` and `socket.address().port`.
*
* If the `signal` option is enabled, calling `.abort()` on the corresponding `AbortController` is similar to calling `.close()` on the socket:
*
* ```js
* const controller = new AbortController();
* const { signal } = controller;
* const server = dgram.createSocket({ type: 'udp4', signal });
* server.on('message', (msg, rinfo) => {
* console.log(`server got: ${msg} from ${rinfo.address}:${rinfo.port}`);
* });
* // Later, when you want to close the server.
* controller.abort();
* ```
* @since v0.11.13
* @param options Available options are:
* @param callback Attached as a listener for `'message'` events. Optional.
*/
function createSocket(type: SocketType, callback?: (msg: Buffer, rinfo: RemoteInfo) => void): Socket;
function createSocket(options: SocketOptions, callback?: (msg: Buffer, rinfo: RemoteInfo) => void): Socket;
/**
* Encapsulates the datagram functionality.
*
* New instances of `dgram.Socket` are created using {@link createSocket}.
* The `new` keyword is not to be used to create `dgram.Socket` instances.
* @since v0.1.99
*/
class Socket extends EventEmitter {
/**
* 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
* specified, the operating system will choose
* one interface and will add membership to it. To add membership to every
* available interface, call `addMembership` multiple times, once per interface.
*
* When called on an unbound socket, this method will implicitly bind to a random
* port, listening on all interfaces.
*
* When sharing a UDP socket across multiple `cluster` workers, the`socket.addMembership()` function must be called only once or an`EADDRINUSE` error will occur:
*
* ```js
* import cluster from 'node:cluster';
* import dgram from 'node:dgram';
*
* if (cluster.isPrimary) {
* cluster.fork(); // Works ok.
* cluster.fork(); // Fails with EADDRINUSE.
* } else {
* const s = dgram.createSocket('udp4');
* s.bind(1234, () => {
* s.addMembership('224.0.0.114');
* });
* }
* ```
* @since v0.6.9
*/
addMembership(multicastAddress: string, multicastInterface?: string): void;
/**
* Returns an object containing the address information for a socket.
* For UDP sockets, this object will contain `address`, `family`, and `port` properties.
*
* This method throws `EBADF` if called on an unbound socket.
* @since v0.1.99
*/
address(): AddressInfo;
/**
* For UDP sockets, causes the `dgram.Socket` to listen for datagram
* messages on a named `port` and optional `address`. If `port` is not
* specified or is `0`, the operating system will attempt to bind to a
* random port. If `address` is not specified, the operating system will
* attempt to listen on all addresses. Once binding is complete, a `'listening'` event is emitted and the optional `callback` function is
* called.
*
* Specifying both a `'listening'` event listener and passing a `callback` to the `socket.bind()` method is not harmful but not very
* useful.
*
* A bound datagram socket keeps the Node.js process running to receive
* datagram messages.
*
* If binding fails, an `'error'` event is generated. In rare case (e.g.
* attempting to bind with a closed socket), an `Error` may be thrown.
*
* Example of a UDP server listening on port 41234:
*
* ```js
* import dgram from 'node:dgram';
*
* const server = dgram.createSocket('udp4');
*
* server.on('error', (err) => {
* console.error(`server error:\n${err.stack}`);
* server.close();
* });
*
* server.on('message', (msg, rinfo) => {
* console.log(`server got: ${msg} from ${rinfo.address}:${rinfo.port}`);
* });
*
* server.on('listening', () => {
* const address = server.address();
* console.log(`server listening ${address.address}:${address.port}`);
* });
*
* server.bind(41234);
* // Prints: server listening 0.0.0.0:41234
* ```
* @since v0.1.99
* @param callback with no parameters. Called when binding is complete.
*/
bind(port?: number, address?: string, callback?: () => void): this;
bind(port?: number, callback?: () => void): this;
bind(callback?: () => void): this;
bind(options: BindOptions, callback?: () => void): this;
/**
* Close the underlying socket and stop listening for data on it. If a callback is
* provided, it is added as a listener for the `'close'` event.
* @since v0.1.99
* @param callback Called when the socket has been closed.
*/
close(callback?: () => void): this;
/**
* Associates the `dgram.Socket` to a remote address and port. Every
* message sent by this handle is automatically sent to that destination. Also,
* the socket will only receive messages from that remote peer.
* Trying to call `connect()` on an already connected socket will result
* in an `ERR_SOCKET_DGRAM_IS_CONNECTED` exception. If `address` is not
* provided, `'127.0.0.1'` (for `udp4` sockets) or `'::1'` (for `udp6` sockets)
* will be used by default. Once the connection is complete, a `'connect'` event
* is emitted and the optional `callback` function is called. In case of failure,
* the `callback` is called or, failing this, an `'error'` event is emitted.
* @since v12.0.0
* @param callback Called when the connection is completed or on error.
*/
connect(port: number, address?: string, callback?: () => void): void;
connect(port: number, callback: () => void): void;
/**
* A synchronous function that disassociates a connected `dgram.Socket` from
* its remote address. Trying to call `disconnect()` on an unbound or already
* disconnected socket will result in an `ERR_SOCKET_DGRAM_NOT_CONNECTED` exception.
* @since v12.0.0
*/
disconnect(): void;
/**
* Instructs the kernel to leave a multicast group at `multicastAddress` using the `IP_DROP_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 v0.6.9
*/
dropMembership(multicastAddress: string, multicastInterface?: string): void;
/**
* This method throws `ERR_SOCKET_BUFFER_SIZE` if called on an unbound socket.
* @since v8.7.0
* @return the `SO_RCVBUF` socket receive buffer size in bytes.
*/
getRecvBufferSize(): number;
/**
* This method throws `ERR_SOCKET_BUFFER_SIZE` if called on an unbound socket.
* @since v8.7.0
* @return the `SO_SNDBUF` socket send buffer size in bytes.
*/
getSendBufferSize(): number;
/**
* @since v18.8.0, v16.19.0
* @return Number of bytes queued for sending.
*/
getSendQueueSize(): number;
/**
* @since v18.8.0, v16.19.0
* @return Number of send requests currently in the queue awaiting to be processed.
*/
getSendQueueCount(): 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. The `socket.ref()` method adds the socket back to the reference
* counting and restores the default behavior.
*
* Calling `socket.ref()` multiples times will have no additional effect.
*
* The `socket.ref()` method returns a reference to the socket so calls can be
* chained.
* @since v0.9.1
*/
ref(): this;
/**
* Returns an object containing the `address`, `family`, and `port` of the remote
* endpoint. This method throws an `ERR_SOCKET_DGRAM_NOT_CONNECTED` exception
* if the socket is not connected.
* @since v12.0.0
*/
remoteAddress(): AddressInfo;
/**
* Broadcasts a datagram on the socket.
* For connectionless sockets, the destination `port` and `address` must be
* specified. Connected sockets, on the other hand, will use their associated
* remote endpoint, so the `port` and `address` arguments must not be set.
*
* The `msg` argument contains the message to be sent.
* Depending on its type, different behavior can apply. If `msg` is a `Buffer`,
* any `TypedArray` or a `DataView`,
* the `offset` and `length` specify the offset within the `Buffer` where the
* message begins and the number of bytes in the message, respectively.
* If `msg` is a `String`, then it is automatically converted to a `Buffer` with `'utf8'` encoding. With messages that
* contain multi-byte characters, `offset` and `length` will be calculated with
* respect to `byte length` and not the character position.
* If `msg` is an array, `offset` and `length` must not be specified.
*
* The `address` argument is a string. If the value of `address` is a host name,
* DNS will be used to resolve the address of the host. If `address` is not
* provided or otherwise nullish, `'127.0.0.1'` (for `udp4` sockets) or `'::1'` (for `udp6` sockets) will be used by default.
*
* If the socket has not been previously bound with a call to `bind`, the socket
* is assigned a random port number and is bound to the "all interfaces" address
* (`'0.0.0.0'` for `udp4` sockets, `'::0'` for `udp6` sockets.)
*
* An optional `callback` function may be specified to as a way of reporting
* DNS errors or for determining when it is safe to reuse the `buf` object.
* DNS lookups delay the time to send for at least one tick of the
* Node.js event loop.
*
* 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
* passed as the first argument to the `callback`. If a `callback` is not given,
* the error is emitted as an `'error'` event on the `socket` object.
*
* Offset and length are optional but both _must_ be set if either are used.
* They are supported only when the first argument is a `Buffer`, a `TypedArray`,
* or a `DataView`.
*
* This method throws `ERR_SOCKET_BAD_PORT` if called on an unbound socket.
*
* Example of sending a UDP packet to a port on `localhost`;
*
* ```js
* import dgram from 'node:dgram';
* import { Buffer } from 'node:buffer';
*
* const message = Buffer.from('Some bytes');
* const client = dgram.createSocket('udp4');
* client.send(message, 41234, 'localhost', (err) => {
* client.close();
* });
* ```
*
* Example of sending a UDP packet composed of multiple buffers to a port on`127.0.0.1`;
*
* ```js
* import dgram from 'node:dgram';
* import { Buffer } from 'node:buffer';
*
* const buf1 = Buffer.from('Some ');
* const buf2 = Buffer.from('bytes');
* const client = dgram.createSocket('udp4');
* client.send([buf1, buf2], 41234, (err) => {
* client.close();
* });
* ```
*
* Sending multiple buffers might be faster or slower depending on the
* application and operating system. Run benchmarks to
* determine the optimal strategy on a case-by-case basis. Generally speaking,
* however, sending multiple buffers is faster.
*
* Example of sending a UDP packet using a socket connected to a port on `localhost`:
*
* ```js
* import dgram from 'node:dgram';
* import { Buffer } from 'node:buffer';
*
* const message = Buffer.from('Some bytes');
* const client = dgram.createSocket('udp4');
* client.connect(41234, 'localhost', (err) => {
* client.send(message, (err) => {
* client.close();
* });
* });
* ```
* @since v0.1.99
* @param msg Message to be sent.
* @param offset Offset in the buffer where the message starts.
* @param length Number of bytes in the message.
* @param port Destination port.
* @param address Destination host name or IP address.
* @param callback Called when the message has been sent.
*/
send(
msg: string | NodeJS.ArrayBufferView | readonly any[],
port?: number,
address?: string,
callback?: (error: Error | null, bytes: number) => void,
): void;
send(
msg: string | NodeJS.ArrayBufferView | readonly any[],
port?: number,
callback?: (error: Error | null, bytes: number) => void,
): void;
send(
msg: string | NodeJS.ArrayBufferView | readonly any[],
callback?: (error: Error | null, bytes: number) => void,
): void;
send(
msg: string | NodeJS.ArrayBufferView,
offset: number,
length: number,
port?: number,
address?: string,
callback?: (error: Error | null, bytes: number) => void,
): void;
send(
msg: string | NodeJS.ArrayBufferView,
offset: number,
length: number,
port?: number,
callback?: (error: Error | null, bytes: number) => void,
): void;
send(
msg: string | NodeJS.ArrayBufferView,
offset: number,
length: number,
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";
}