@types/node/dgram.d.ts

/**
 * The `dgram` module provides an implementation of UDP datagram sockets.
 *
 * ```js
 * import dgram from 'dgram';
 *
 * const server = dgram.createSocket('udp4');
 *
 * server.on('error', (err) => {
 *   console.log(`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/v17.0.0/lib/dgram.js)
 */
declare module 'dgram' {
    import { AddressInfo } from 'node:net';
    import * as dns from 'node:dns';
    import { EventEmitter, Abortable } 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;
        /**
         * @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;
    }
    /**
     * 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 'cluster';
         * import dgram from '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 'dgram';
         *
         * const server = dgram.createSocket('udp4');
         *
         * server.on('error', (err) => {
         *   console.log(`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;
        /**
         * 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 'dgram';
         * import { Buffer } from '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 'dgram';
         * import { Buffer } from '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 'dgram';
         * import { Buffer } from '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 | Uint8Array | ReadonlyArray<any>, port?: number, address?: string, callback?: (error: Error | null, bytes: number) => void): void;
        send(msg: string | Uint8Array | ReadonlyArray<any>, port?: number, callback?: (error: Error | null, bytes: number) => void): void;
        send(msg: string | Uint8Array | ReadonlyArray<any>, callback?: (error: Error | null, bytes: number) => void): void;
        send(msg: string | Uint8Array, offset: number, length: number, port?: number, address?: string, callback?: (error: Error | null, bytes: number) => void): void;
        send(msg: string | Uint8Array, offset: number, length: number, port?: number, callback?: (error: Error | null, bytes: number) => void): void;
        send(msg: string | Uint8Array, 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 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 addition 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;
    }
}
declare module 'node:dgram' {
    export * from 'dgram';
}