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dgram.js
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1059 lines (864 loc) · 27.3 KB
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// Copyright Joyent, Inc. and other Node contributors.
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to permit
// persons to whom the Software is furnished to do so, subject to the
// following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
// USE OR OTHER DEALINGS IN THE SOFTWARE.
'use strict';
const {
Array,
ArrayIsArray,
ArrayPrototypePush,
FunctionPrototypeBind,
FunctionPrototypeCall,
ObjectDefineProperty,
ObjectSetPrototypeOf,
SymbolAsyncDispose,
SymbolDispose,
} = primordials;
const {
ErrnoException,
ExceptionWithHostPort,
codes: {
ERR_BUFFER_OUT_OF_BOUNDS,
ERR_INVALID_ARG_TYPE,
ERR_INVALID_FD_TYPE,
ERR_IP_BLOCKED,
ERR_MISSING_ARGS,
ERR_SOCKET_ALREADY_BOUND,
ERR_SOCKET_BAD_BUFFER_SIZE,
ERR_SOCKET_BUFFER_SIZE,
ERR_SOCKET_DGRAM_IS_CONNECTED,
ERR_SOCKET_DGRAM_NOT_CONNECTED,
ERR_SOCKET_DGRAM_NOT_RUNNING,
},
} = require('internal/errors');
const {
kStateSymbol,
newHandle,
} = require('internal/dgram');
const { isIP } = require('internal/net');
const {
isInt32,
validateAbortSignal,
validateString,
validateNumber,
validatePort,
validateUint32,
} = require('internal/validators');
const { Buffer } = require('buffer');
const { guessHandleType, promisify } = require('internal/util');
const { isArrayBufferView } = require('internal/util/types');
const EventEmitter = require('events');
const { addAbortListener } = require('internal/events/abort_listener');
const {
defaultTriggerAsyncIdScope,
symbols: { async_id_symbol, owner_symbol },
} = require('internal/async_hooks');
const { FastBuffer } = require('internal/buffer');
const { UV_UDP_REUSEADDR } = internalBinding('constants').os;
const {
constants: { UV_UDP_IPV6ONLY, UV_UDP_REUSEPORT },
UDP,
SendWrap,
} = internalBinding('udp_wrap');
const dc = require('diagnostics_channel');
const udpSocketChannel = dc.channel('udp.socket');
const BIND_STATE_UNBOUND = 0;
const BIND_STATE_BINDING = 1;
const BIND_STATE_BOUND = 2;
const CONNECT_STATE_DISCONNECTED = 0;
const CONNECT_STATE_CONNECTING = 1;
const CONNECT_STATE_CONNECTED = 2;
const RECV_BUFFER = true;
const SEND_BUFFER = false;
// Lazily loaded
let _cluster = null;
function lazyLoadCluster() {
return _cluster ??= require('cluster');
}
let _blockList = null;
function lazyLoadBlockList() {
return _blockList ??= require('internal/blocklist').BlockList;
}
function Socket(type, listener) {
FunctionPrototypeCall(EventEmitter, this);
let lookup;
let recvBufferSize;
let sendBufferSize;
let receiveBlockList;
let sendBlockList;
let options;
if (type !== null && typeof type === 'object') {
options = type;
type = options.type;
lookup = options.lookup;
if (options.recvBufferSize) {
validateUint32(options.recvBufferSize, 'options.recvBufferSize');
}
if (options.sendBufferSize) {
validateUint32(options.sendBufferSize, 'options.sendBufferSize');
}
recvBufferSize = options.recvBufferSize;
sendBufferSize = options.sendBufferSize;
if (options.receiveBlockList) {
if (!lazyLoadBlockList().isBlockList(options.receiveBlockList)) {
throw new ERR_INVALID_ARG_TYPE('options.receiveBlockList', 'net.BlockList', options.receiveBlockList);
}
receiveBlockList = options.receiveBlockList;
}
if (options.sendBlockList) {
if (!lazyLoadBlockList().isBlockList(options.sendBlockList)) {
throw new ERR_INVALID_ARG_TYPE('options.sendBlockList', 'net.BlockList', options.sendBlockList);
}
sendBlockList = options.sendBlockList;
}
}
const handle = newHandle(type, lookup);
handle[owner_symbol] = this;
this[async_id_symbol] = handle.getAsyncId();
this.type = type;
if (typeof listener === 'function')
this.on('message', listener);
this[kStateSymbol] = {
handle,
receiving: false,
bindState: BIND_STATE_UNBOUND,
connectState: CONNECT_STATE_DISCONNECTED,
queue: undefined,
reuseAddr: options?.reuseAddr, // Use UV_UDP_REUSEADDR if true.
reusePort: options?.reusePort,
ipv6Only: options?.ipv6Only,
recvBufferSize,
sendBufferSize,
receiveBlockList,
sendBlockList,
};
if (options?.signal !== undefined) {
const { signal } = options;
validateAbortSignal(signal, 'options.signal');
const onAborted = () => {
if (this[kStateSymbol].handle) this.close();
};
if (signal.aborted) {
onAborted();
} else {
const disposable = addAbortListener(signal, onAborted);
this.once('close', disposable[SymbolDispose]);
}
}
if (udpSocketChannel.hasSubscribers) {
udpSocketChannel.publish({
socket: this,
});
}
}
ObjectSetPrototypeOf(Socket.prototype, EventEmitter.prototype);
ObjectSetPrototypeOf(Socket, EventEmitter);
function createSocket(type, listener) {
return new Socket(type, listener);
}
function startListening(socket) {
const state = socket[kStateSymbol];
state.handle.onmessage = onMessage;
state.handle.onerror = onError;
state.handle.recvStart();
state.receiving = true;
state.bindState = BIND_STATE_BOUND;
if (state.recvBufferSize)
bufferSize(socket, state.recvBufferSize, RECV_BUFFER);
if (state.sendBufferSize)
bufferSize(socket, state.sendBufferSize, SEND_BUFFER);
socket.emit('listening');
}
function replaceHandle(self, newHandle) {
const state = self[kStateSymbol];
const oldHandle = state.handle;
// Sync the old handle state to new handle
if (!oldHandle.hasRef() && typeof newHandle.unref === 'function') {
newHandle.unref();
}
// Set up the handle that we got from primary.
newHandle.lookup = oldHandle.lookup;
newHandle.bind = oldHandle.bind;
newHandle.send = oldHandle.send;
newHandle[owner_symbol] = self;
// Replace the existing handle by the handle we got from primary.
oldHandle.close();
state.handle = newHandle;
}
function bufferSize(self, size, buffer) {
if (size >>> 0 !== size)
throw new ERR_SOCKET_BAD_BUFFER_SIZE();
const ctx = {};
const ret = self[kStateSymbol].handle.bufferSize(size, buffer, ctx);
if (ret === undefined) {
throw new ERR_SOCKET_BUFFER_SIZE(ctx);
}
return ret;
}
// Query primary process to get the server handle and utilize it.
function bindServerHandle(self, options, errCb) {
const cluster = lazyLoadCluster();
const state = self[kStateSymbol];
cluster._getServer(self, options, (err, handle) => {
if (err) {
// Do not call callback if socket is closed
if (state.handle) {
errCb(err);
}
return;
}
if (!state.handle) {
// Handle has been closed in the mean time.
return handle.close();
}
replaceHandle(self, handle);
startListening(self);
});
}
Socket.prototype.bind = function(port_, address_ /* , callback */) {
let port = port_;
healthCheck(this);
const state = this[kStateSymbol];
if (state.bindState !== BIND_STATE_UNBOUND)
throw new ERR_SOCKET_ALREADY_BOUND();
state.bindState = BIND_STATE_BINDING;
const cb = arguments.length && arguments[arguments.length - 1];
if (typeof cb === 'function') {
function removeListeners() {
this.removeListener('error', removeListeners);
this.removeListener('listening', onListening);
}
function onListening() {
FunctionPrototypeCall(removeListeners, this);
FunctionPrototypeCall(cb, this);
}
this.on('error', removeListeners);
this.on('listening', onListening);
}
if (port !== null &&
typeof port === 'object' &&
typeof port.recvStart === 'function') {
replaceHandle(this, port);
startListening(this);
return this;
}
// Open an existing fd instead of creating a new one.
if (port !== null && typeof port === 'object' &&
isInt32(port.fd) && port.fd > 0) {
const fd = port.fd;
const exclusive = !!port.exclusive;
const state = this[kStateSymbol];
const cluster = lazyLoadCluster();
if (cluster.isWorker && !exclusive) {
bindServerHandle(this, {
address: null,
port: null,
addressType: this.type,
fd,
flags: null,
}, (err) => {
// Callback to handle error.
const ex = new ErrnoException(err, 'open');
state.bindState = BIND_STATE_UNBOUND;
this.emit('error', ex);
});
return this;
}
const type = guessHandleType(fd);
if (type !== 'UDP')
throw new ERR_INVALID_FD_TYPE(type);
const err = state.handle.open(fd);
if (err)
throw new ErrnoException(err, 'open');
startListening(this);
return this;
}
let address;
let exclusive;
if (port !== null && typeof port === 'object') {
address = port.address || '';
exclusive = !!port.exclusive;
port = port.port;
} else {
address = typeof address_ === 'function' ? '' : address_;
exclusive = false;
}
// Defaulting address for bind to all interfaces
if (!address) {
if (this.type === 'udp4')
address = '0.0.0.0';
else
address = '::';
}
// Resolve address first
state.handle.lookup(address, (err, ip) => {
if (!state.handle)
return; // Handle has been closed in the mean time
if (err) {
state.bindState = BIND_STATE_UNBOUND;
this.emit('error', err);
return;
}
const cluster = lazyLoadCluster();
let flags = 0;
if (state.reuseAddr)
flags |= UV_UDP_REUSEADDR;
if (state.ipv6Only)
flags |= UV_UDP_IPV6ONLY;
if (state.reusePort) {
exclusive = true;
flags |= UV_UDP_REUSEPORT;
}
if (cluster.isWorker && !exclusive) {
bindServerHandle(this, {
address: ip,
port: port,
addressType: this.type,
fd: -1,
flags: flags,
}, (err) => {
// Callback to handle error.
const ex = new ExceptionWithHostPort(err, 'bind', ip, port);
state.bindState = BIND_STATE_UNBOUND;
this.emit('error', ex);
});
} else {
const err = state.handle.bind(ip, port || 0, flags);
if (err) {
const ex = new ExceptionWithHostPort(err, 'bind', ip, port);
state.bindState = BIND_STATE_UNBOUND;
this.emit('error', ex);
// Todo: close?
return;
}
startListening(this);
}
});
return this;
};
Socket.prototype.connect = function(port, address, callback) {
port = validatePort(port, 'Port', false);
if (typeof address === 'function') {
callback = address;
address = '';
} else if (address === undefined) {
address = '';
}
validateString(address, 'address');
const state = this[kStateSymbol];
if (state.connectState !== CONNECT_STATE_DISCONNECTED)
throw new ERR_SOCKET_DGRAM_IS_CONNECTED();
state.connectState = CONNECT_STATE_CONNECTING;
if (state.bindState === BIND_STATE_UNBOUND)
this.bind({ port: 0, exclusive: true }, null);
if (state.bindState !== BIND_STATE_BOUND) {
enqueue(this, FunctionPrototypeBind(_connect, this,
port, address, callback));
return;
}
FunctionPrototypeCall(_connect, this, port, address, callback);
};
function _connect(port, address, callback) {
const state = this[kStateSymbol];
if (callback)
this.once('connect', callback);
const afterDns = (ex, ip) => {
defaultTriggerAsyncIdScope(
this[async_id_symbol],
doConnect,
ex, this, ip, address, port, callback,
);
};
state.handle.lookup(address, afterDns);
}
function doConnect(ex, self, ip, address, port, callback) {
const state = self[kStateSymbol];
if (!state.handle)
return;
if (!ex && state.sendBlockList?.check(ip, `ipv${isIP(ip)}`)) {
ex = new ERR_IP_BLOCKED(ip);
}
if (!ex) {
const err = state.handle.connect(ip, port);
if (err) {
ex = new ExceptionWithHostPort(err, 'connect', address, port);
}
}
if (ex) {
state.connectState = CONNECT_STATE_DISCONNECTED;
return process.nextTick(() => {
if (callback) {
self.removeListener('connect', callback);
callback(ex);
} else {
self.emit('error', ex);
}
});
}
state.connectState = CONNECT_STATE_CONNECTED;
process.nextTick(() => self.emit('connect'));
}
Socket.prototype.disconnect = function() {
const state = this[kStateSymbol];
if (state.connectState !== CONNECT_STATE_CONNECTED)
throw new ERR_SOCKET_DGRAM_NOT_CONNECTED();
const err = state.handle.disconnect();
if (err)
throw new ErrnoException(err, 'connect');
else
state.connectState = CONNECT_STATE_DISCONNECTED;
};
// Thin wrapper around `send`, here for compatibility with dgram_legacy.js
Socket.prototype.sendto = function(buffer,
offset,
length,
port,
address,
callback) {
validateNumber(offset, 'offset');
validateNumber(length, 'length');
validateNumber(port, 'port');
validateString(address, 'address');
this.send(buffer, offset, length, port, address, callback);
};
function sliceBuffer(buffer, offset, length) {
if (typeof buffer === 'string') {
buffer = Buffer.from(buffer);
} else if (!isArrayBufferView(buffer)) {
throw new ERR_INVALID_ARG_TYPE('buffer',
['Buffer',
'TypedArray',
'DataView',
'string'],
buffer);
}
offset = offset >>> 0;
length = length >>> 0;
if (offset > buffer.byteLength) {
throw new ERR_BUFFER_OUT_OF_BOUNDS('offset');
}
if (offset + length > buffer.byteLength) {
throw new ERR_BUFFER_OUT_OF_BOUNDS('length');
}
return Buffer.from(buffer.buffer, buffer.byteOffset + offset, length);
}
function fixBufferList(list) {
const newlist = new Array(list.length);
for (let i = 0, l = list.length; i < l; i++) {
const buf = list[i];
if (typeof buf === 'string')
newlist[i] = Buffer.from(buf);
else if (Buffer.isBuffer(buf))
newlist[i] = buf;
else if (!isArrayBufferView(buf))
return null;
else
newlist[i] = Buffer.from(buf.buffer, buf.byteOffset, buf.byteLength);
}
return newlist;
}
function enqueue(self, toEnqueue) {
const state = self[kStateSymbol];
// If the send queue hasn't been initialized yet, do it, and install an
// event handler that flushes the send queue after binding is done.
if (state.queue === undefined) {
state.queue = [];
self.once(EventEmitter.errorMonitor, onListenError);
self.once('listening', onListenSuccess);
}
ArrayPrototypePush(state.queue, toEnqueue);
}
function onListenSuccess() {
this.removeListener(EventEmitter.errorMonitor, onListenError);
FunctionPrototypeCall(clearQueue, this);
}
function onListenError(err) {
this.removeListener('listening', onListenSuccess);
this[kStateSymbol].queue = undefined;
}
function clearQueue() {
const state = this[kStateSymbol];
const queue = state.queue;
state.queue = undefined;
// Flush the send queue.
for (const queueEntry of queue)
queueEntry();
}
// valid combinations
// For connectionless sockets
// send(buffer, offset, length, port, address, callback)
// send(buffer, offset, length, port, address)
// send(buffer, offset, length, port, callback)
// send(buffer, offset, length, port)
// send(bufferOrList, port, address, callback)
// send(bufferOrList, port, address)
// send(bufferOrList, port, callback)
// send(bufferOrList, port)
// For connected sockets
// send(buffer, offset, length, callback)
// send(buffer, offset, length)
// send(bufferOrList, callback)
// send(bufferOrList)
Socket.prototype.send = function(buffer,
offset,
length,
port,
address,
callback) {
let list;
const state = this[kStateSymbol];
const connected = state.connectState === CONNECT_STATE_CONNECTED;
if (!connected) {
if (address || (port && typeof port !== 'function')) {
buffer = sliceBuffer(buffer, offset, length);
} else {
callback = port;
port = offset;
address = length;
}
} else {
if (typeof length === 'number') {
buffer = sliceBuffer(buffer, offset, length);
if (typeof port === 'function') {
callback = port;
port = null;
}
} else {
callback = offset;
}
if (port || address)
throw new ERR_SOCKET_DGRAM_IS_CONNECTED();
}
if (!ArrayIsArray(buffer)) {
if (typeof buffer === 'string') {
list = [ Buffer.from(buffer) ];
} else if (!isArrayBufferView(buffer)) {
throw new ERR_INVALID_ARG_TYPE('buffer',
['Buffer',
'TypedArray',
'DataView',
'string'],
buffer);
} else {
list = [ buffer ];
}
} else if (!(list = fixBufferList(buffer))) {
throw new ERR_INVALID_ARG_TYPE('buffer list arguments',
['Buffer',
'TypedArray',
'DataView',
'string'],
buffer);
}
if (!connected)
port = validatePort(port, 'Port', false);
// Normalize callback so it's either a function or undefined but not anything
// else.
if (typeof callback !== 'function')
callback = undefined;
if (typeof address === 'function') {
callback = address;
address = undefined;
} else if (address != null) {
validateString(address, 'address');
}
healthCheck(this);
if (state.bindState === BIND_STATE_UNBOUND)
this.bind({ port: 0, exclusive: true }, null);
if (list.length === 0)
ArrayPrototypePush(list, new FastBuffer());
// If the socket hasn't been bound yet, push the outbound packet onto the
// send queue and send after binding is complete.
if (state.bindState !== BIND_STATE_BOUND) {
enqueue(this, FunctionPrototypeBind(this.send, this,
list, port, address, callback));
return;
}
const afterDns = (ex, ip) => {
defaultTriggerAsyncIdScope(
this[async_id_symbol],
doSend,
ex, this, ip, list, address, port, callback,
);
};
if (!connected) {
state.handle.lookup(address, afterDns);
} else {
afterDns(null, null);
}
};
function doSend(ex, self, ip, list, address, port, callback) {
const state = self[kStateSymbol];
if (ex) {
if (typeof callback === 'function') {
process.nextTick(callback, ex);
return;
}
process.nextTick(() => self.emit('error', ex));
return;
} else if (!state.handle) {
return;
}
if (ip && state.sendBlockList?.check(ip, `ipv${isIP(ip)}`)) {
if (callback) {
process.nextTick(callback, new ERR_IP_BLOCKED(ip));
}
return;
}
const req = new SendWrap();
req.list = list; // Keep reference alive.
req.address = address;
req.port = port;
if (callback) {
req.callback = callback;
req.oncomplete = afterSend;
}
let err;
if (port)
err = state.handle.send(req, list, list.length, port, ip, !!callback);
else
err = state.handle.send(req, list, list.length, !!callback);
if (err >= 1) {
// Synchronous finish. The return code is msg_length + 1 so that we can
// distinguish between synchronous success and asynchronous success.
if (callback)
process.nextTick(callback, null, err - 1);
return;
}
if (err && callback) {
// Don't emit as error, dgram_legacy.js compatibility
const ex = new ExceptionWithHostPort(err, 'send', address, port);
process.nextTick(callback, ex);
}
}
function afterSend(err, sent) {
if (err) {
err = new ExceptionWithHostPort(err, 'send', this.address, this.port);
} else {
err = null;
}
this.callback(err, sent);
}
Socket.prototype.close = function(callback) {
const state = this[kStateSymbol];
const queue = state.queue;
if (typeof callback === 'function')
this.on('close', callback);
if (queue !== undefined) {
ArrayPrototypePush(queue, FunctionPrototypeBind(this.close, this));
return this;
}
healthCheck(this);
stopReceiving(this);
state.handle.close();
state.handle = null;
defaultTriggerAsyncIdScope(this[async_id_symbol],
process.nextTick,
socketCloseNT,
this);
return this;
};
Socket.prototype[SymbolAsyncDispose] = async function() {
if (!this[kStateSymbol].handle) {
return;
}
await FunctionPrototypeCall(promisify(this.close), this);
};
function socketCloseNT(self) {
self.emit('close');
}
Socket.prototype.address = function() {
healthCheck(this);
const out = {};
const err = this[kStateSymbol].handle.getsockname(out);
if (err) {
throw new ErrnoException(err, 'getsockname');
}
return out;
};
Socket.prototype.remoteAddress = function() {
healthCheck(this);
const state = this[kStateSymbol];
if (state.connectState !== CONNECT_STATE_CONNECTED)
throw new ERR_SOCKET_DGRAM_NOT_CONNECTED();
const out = {};
const err = state.handle.getpeername(out);
if (err)
throw new ErrnoException(err, 'getpeername');
return out;
};
Socket.prototype.setBroadcast = function(arg) {
const err = this[kStateSymbol].handle.setBroadcast(arg ? 1 : 0);
if (err) {
throw new ErrnoException(err, 'setBroadcast');
}
};
Socket.prototype.setTTL = function(ttl) {
validateNumber(ttl, 'ttl');
const err = this[kStateSymbol].handle.setTTL(ttl);
if (err) {
throw new ErrnoException(err, 'setTTL');
}
return ttl;
};
Socket.prototype.setMulticastTTL = function(ttl) {
validateNumber(ttl, 'ttl');
const err = this[kStateSymbol].handle.setMulticastTTL(ttl);
if (err) {
throw new ErrnoException(err, 'setMulticastTTL');
}
return ttl;
};
Socket.prototype.setMulticastLoopback = function(arg) {
const err = this[kStateSymbol].handle.setMulticastLoopback(arg ? 1 : 0);
if (err) {
throw new ErrnoException(err, 'setMulticastLoopback');
}
return arg; // 0.4 compatibility
};
Socket.prototype.setMulticastInterface = function(interfaceAddress) {
healthCheck(this);
validateString(interfaceAddress, 'interfaceAddress');
const err = this[kStateSymbol].handle.setMulticastInterface(interfaceAddress);
if (err) {
throw new ErrnoException(err, 'setMulticastInterface');
}
};
Socket.prototype.addMembership = function(multicastAddress,
interfaceAddress) {
healthCheck(this);
if (!multicastAddress) {
throw new ERR_MISSING_ARGS('multicastAddress');
}
const { handle } = this[kStateSymbol];
const err = handle.addMembership(multicastAddress, interfaceAddress);
if (err) {
throw new ErrnoException(err, 'addMembership');
}
};
Socket.prototype.dropMembership = function(multicastAddress,
interfaceAddress) {
healthCheck(this);
if (!multicastAddress) {
throw new ERR_MISSING_ARGS('multicastAddress');
}
const { handle } = this[kStateSymbol];
const err = handle.dropMembership(multicastAddress, interfaceAddress);
if (err) {
throw new ErrnoException(err, 'dropMembership');
}
};
Socket.prototype.addSourceSpecificMembership = function(sourceAddress,
groupAddress,
interfaceAddress) {
healthCheck(this);
validateString(sourceAddress, 'sourceAddress');
validateString(groupAddress, 'groupAddress');
const err =
this[kStateSymbol].handle.addSourceSpecificMembership(sourceAddress,
groupAddress,
interfaceAddress);
if (err) {
throw new ErrnoException(err, 'addSourceSpecificMembership');
}
};
Socket.prototype.dropSourceSpecificMembership = function(sourceAddress,
groupAddress,
interfaceAddress) {
healthCheck(this);
validateString(sourceAddress, 'sourceAddress');
validateString(groupAddress, 'groupAddress');
const err =
this[kStateSymbol].handle.dropSourceSpecificMembership(sourceAddress,
groupAddress,
interfaceAddress);
if (err) {
throw new ErrnoException(err, 'dropSourceSpecificMembership');
}
};
function healthCheck(socket) {
if (!socket[kStateSymbol].handle) {
// Error message from dgram_legacy.js.
throw new ERR_SOCKET_DGRAM_NOT_RUNNING();
}
}
function stopReceiving(socket) {
const state = socket[kStateSymbol];
if (!state.receiving)
return;
state.handle.recvStop();
state.receiving = false;
}
function onMessage(nread, handle, buf, rinfo) {
const self = handle[owner_symbol];
if (nread < 0) {
return self.emit('error', new ErrnoException(nread, 'recvmsg'));
}
if (self[kStateSymbol]?.receiveBlockList?.check(rinfo.address,
rinfo.family?.toLocaleLowerCase())) {
return;
}
rinfo.size = buf.length; // compatibility
self.emit('message', buf, rinfo);
}
function onError(nread, handle, error) {
const self = handle[owner_symbol];
return self.emit('error', error);
}