'use strict'; const events = require('events'); const stream = require('stream'); const timers = require('timers'); const util = require('util'); const internalUtil = require('internal/util'); const assert = require('assert'); const cares = process.binding('cares_wrap'); const uv = process.binding('uv'); const Buffer = require('buffer').Buffer; const TTYWrap = process.binding('tty_wrap'); const TCP = process.binding('tcp_wrap').TCP; const Pipe = process.binding('pipe_wrap').Pipe; const TCPConnectWrap = process.binding('tcp_wrap').TCPConnectWrap; const PipeConnectWrap = process.binding('pipe_wrap').PipeConnectWrap; const ShutdownWrap = process.binding('stream_wrap').ShutdownWrap; const WriteWrap = process.binding('stream_wrap').WriteWrap; var cluster; const errnoException = util._errnoException; const exceptionWithHostPort = util._exceptionWithHostPort; function noop() {} function createHandle(fd) { var type = TTYWrap.guessHandleType(fd); if (type === 'PIPE') return new Pipe(); if (type === 'TCP') return new TCP(); throw new TypeError('Unsupported fd type: ' + type); } const debug = util.debuglog('net'); function isPipeName(s) { return typeof s === 'string' && toNumber(s) === false; } exports.createServer = function(options, connectionListener) { return new Server(options, connectionListener); }; // Target API: // // var s = net.connect({port: 80, host: 'google.com'}, function() { // ... // }); // // There are various forms: // // connect(options, [cb]) // connect(port, [host], [cb]) // connect(path, [cb]); // exports.connect = exports.createConnection = function() { var args = normalizeConnectArgs(arguments); debug('createConnection', args); var s = new Socket(args[0]); return Socket.prototype.connect.apply(s, args); }; // Returns an array [options] or [options, cb] // It is the same as the argument of Socket.prototype.connect(). function normalizeConnectArgs(args) { var options = {}; if (args[0] !== null && typeof args[0] === 'object') { // connect(options, [cb]) options = args[0]; } else if (isPipeName(args[0])) { // connect(path, [cb]); options.path = args[0]; } else { // connect(port, [host], [cb]) options.port = args[0]; if (typeof args[1] === 'string') { options.host = args[1]; } } var cb = args[args.length - 1]; return typeof cb === 'function' ? [options, cb] : [options]; } exports._normalizeConnectArgs = normalizeConnectArgs; // called when creating new Socket, or when re-using a closed Socket function initSocketHandle(self) { self.destroyed = false; self.bytesRead = 0; self._bytesDispatched = 0; self._sockname = null; // Handle creation may be deferred to bind() or connect() time. if (self._handle) { self._handle.owner = self; self._handle.onread = onread; // If handle doesn't support writev - neither do we if (!self._handle.writev) self._writev = null; } } function Socket(options) { if (!(this instanceof Socket)) return new Socket(options); this._connecting = false; this._hadError = false; this._handle = null; this._parent = null; this._host = null; if (typeof options === 'number') options = { fd: options }; // Legacy interface. else if (options === undefined) options = {}; stream.Duplex.call(this, options); if (options.handle) { this._handle = options.handle; // private } else if (options.fd !== undefined) { this._handle = createHandle(options.fd); this._handle.open(options.fd); if ((options.fd == 1 || options.fd == 2) && (this._handle instanceof Pipe) && process.platform === 'win32') { // Make stdout and stderr blocking on Windows var err = this._handle.setBlocking(true); if (err) throw errnoException(err, 'setBlocking'); } this.readable = options.readable !== false; this.writable = options.writable !== false; } else { // these will be set once there is a connection this.readable = this.writable = false; } // shut down the socket when we're finished with it. this.on('finish', onSocketFinish); this.on('_socketEnd', onSocketEnd); initSocketHandle(this); this._pendingData = null; this._pendingEncoding = ''; // handle strings directly this._writableState.decodeStrings = false; // default to *not* allowing half open sockets this.allowHalfOpen = options && options.allowHalfOpen || false; // if we have a handle, then start the flow of data into the // buffer. if not, then this will happen when we connect if (this._handle && options.readable !== false) { if (options.pauseOnCreate) { // stop the handle from reading and pause the stream this._handle.reading = false; this._handle.readStop(); this._readableState.flowing = false; } else { this.read(0); } } } util.inherits(Socket, stream.Duplex); Socket.prototype._unrefTimer = function unrefTimer() { for (var s = this; s !== null; s = s._parent) timers._unrefActive(s); }; // the user has called .end(), and all the bytes have been // sent out to the other side. // If allowHalfOpen is false, or if the readable side has // ended already, then destroy. // If allowHalfOpen is true, then we need to do a shutdown, // so that only the writable side will be cleaned up. function onSocketFinish() { // If still connecting - defer handling 'finish' until 'connect' will happen if (this._connecting) { debug('osF: not yet connected'); return this.once('connect', onSocketFinish); } debug('onSocketFinish'); if (!this.readable || this._readableState.ended) { debug('oSF: ended, destroy', this._readableState); return this.destroy(); } debug('oSF: not ended, call shutdown()'); // otherwise, just shutdown, or destroy() if not possible if (!this._handle || !this._handle.shutdown) return this.destroy(); var req = new ShutdownWrap(); req.oncomplete = afterShutdown; req.handle = this._handle; var err = this._handle.shutdown(req); if (err) return this._destroy(errnoException(err, 'shutdown')); } function afterShutdown(status, handle, req) { var self = handle.owner; debug('afterShutdown destroyed=%j', self.destroyed, self._readableState); // callback may come after call to destroy. if (self.destroyed) return; if (self._readableState.ended) { debug('readableState ended, destroying'); self.destroy(); } else { self.once('_socketEnd', self.destroy); } } // the EOF has been received, and no more bytes are coming. // if the writable side has ended already, then clean everything // up. function onSocketEnd() { // XXX Should not have to do as much crap in this function. // ended should already be true, since this is called *after* // the EOF errno and onread has eof'ed debug('onSocketEnd', this._readableState); this._readableState.ended = true; if (this._readableState.endEmitted) { this.readable = false; maybeDestroy(this); } else { this.once('end', function() { this.readable = false; maybeDestroy(this); }); this.read(0); } if (!this.allowHalfOpen) { this.write = writeAfterFIN; this.destroySoon(); } } // Provide a better error message when we call end() as a result // of the other side sending a FIN. The standard 'write after end' // is overly vague, and makes it seem like the user's code is to blame. function writeAfterFIN(chunk, encoding, cb) { if (typeof encoding === 'function') { cb = encoding; encoding = null; } var er = new Error('This socket has been ended by the other party'); er.code = 'EPIPE'; var self = this; // TODO: defer error events consistently everywhere, not just the cb self.emit('error', er); if (typeof cb === 'function') { process.nextTick(cb, er); } } exports.Socket = Socket; exports.Stream = Socket; // Legacy naming. Socket.prototype.read = function(n) { if (n === 0) return stream.Readable.prototype.read.call(this, n); this.read = stream.Readable.prototype.read; this._consuming = true; return this.read(n); }; Socket.prototype.listen = function() { debug('socket.listen'); var self = this; self.on('connection', arguments[0]); listen(self, null, null, null); }; Socket.prototype.setTimeout = function(msecs, callback) { if (msecs === 0) { timers.unenroll(this); if (callback) { this.removeListener('timeout', callback); } } else { timers.enroll(this, msecs); timers._unrefActive(this); if (callback) { this.once('timeout', callback); } } return this; }; Socket.prototype._onTimeout = function() { debug('_onTimeout'); this.emit('timeout'); }; Socket.prototype.setNoDelay = function(enable) { if (!this._handle) { this.once('connect', enable ? this.setNoDelay : this.setNoDelay.bind(this, enable)); return this; } // backwards compatibility: assume true when `enable` is omitted if (this._handle.setNoDelay) this._handle.setNoDelay(enable === undefined ? true : !!enable); return this; }; Socket.prototype.setKeepAlive = function(setting, msecs) { if (!this._handle) { this.once('connect', this.setKeepAlive.bind(this, setting, msecs)); return this; } if (this._handle.setKeepAlive) this._handle.setKeepAlive(setting, ~~(msecs / 1000)); return this; }; Socket.prototype.address = function() { return this._getsockname(); }; Object.defineProperty(Socket.prototype, 'readyState', { get: function() { if (this._connecting) { return 'opening'; } else if (this.readable && this.writable) { return 'open'; } else if (this.readable && !this.writable) { return 'readOnly'; } else if (!this.readable && this.writable) { return 'writeOnly'; } else { return 'closed'; } } }); Object.defineProperty(Socket.prototype, 'bufferSize', { get: function() { if (this._handle) { return this._handle.writeQueueSize + this._writableState.length; } } }); // Just call handle.readStart until we have enough in the buffer Socket.prototype._read = function(n) { debug('_read'); if (this._connecting || !this._handle) { debug('_read wait for connection'); this.once('connect', this._read.bind(this, n)); } else if (!this._handle.reading) { // not already reading, start the flow debug('Socket._read readStart'); this._handle.reading = true; var err = this._handle.readStart(); if (err) this._destroy(errnoException(err, 'read')); } }; Socket.prototype.end = function(data, encoding) { stream.Duplex.prototype.end.call(this, data, encoding); this.writable = false; DTRACE_NET_STREAM_END(this); LTTNG_NET_STREAM_END(this); // just in case we're waiting for an EOF. if (this.readable && !this._readableState.endEmitted) this.read(0); else maybeDestroy(this); }; // Call whenever we set writable=false or readable=false function maybeDestroy(socket) { if (!socket.readable && !socket.writable && !socket.destroyed && !socket._connecting && !socket._writableState.length) { socket.destroy(); } } Socket.prototype.destroySoon = function() { if (this.writable) this.end(); if (this._writableState.finished) this.destroy(); else this.once('finish', this.destroy); }; Socket.prototype._destroy = function(exception, cb) { debug('destroy'); var self = this; function fireErrorCallbacks() { if (cb) cb(exception); if (exception && !self._writableState.errorEmitted) { process.nextTick(emitErrorNT, self, exception); self._writableState.errorEmitted = true; } } if (this.destroyed) { debug('already destroyed, fire error callbacks'); fireErrorCallbacks(); return; } self._connecting = false; this.readable = this.writable = false; for (var s = this; s !== null; s = s._parent) timers.unenroll(s); debug('close'); if (this._handle) { if (this !== process.stderr) debug('close handle'); var isException = exception ? true : false; this._handle.close(function() { debug('emit close'); self.emit('close', isException); }); this._handle.onread = noop; this._handle = null; this._sockname = null; } // we set destroyed to true before firing error callbacks in order // to make it re-entrance safe in case Socket.prototype.destroy() // is called within callbacks this.destroyed = true; fireErrorCallbacks(); if (this.server) { COUNTER_NET_SERVER_CONNECTION_CLOSE(this); debug('has server'); this.server._connections--; if (this.server._emitCloseIfDrained) { this.server._emitCloseIfDrained(); } } }; Socket.prototype.destroy = function(exception) { debug('destroy', exception); this._destroy(exception); }; // This function is called whenever the handle gets a // buffer, or when there's an error reading. function onread(nread, buffer) { var handle = this; var self = handle.owner; assert(handle === self._handle, 'handle != self._handle'); self._unrefTimer(); debug('onread', nread); if (nread > 0) { debug('got data'); // read success. // In theory (and in practice) calling readStop right now // will prevent this from being called again until _read() gets // called again. // if it's not enough data, we'll just call handle.readStart() // again right away. self.bytesRead += nread; // Optimization: emit the original buffer with end points var ret = self.push(buffer); if (handle.reading && !ret) { handle.reading = false; debug('readStop'); var err = handle.readStop(); if (err) self._destroy(errnoException(err, 'read')); } return; } // if we didn't get any bytes, that doesn't necessarily mean EOF. // wait for the next one. if (nread === 0) { debug('not any data, keep waiting'); return; } // Error, possibly EOF. if (nread !== uv.UV_EOF) { return self._destroy(errnoException(nread, 'read')); } debug('EOF'); if (self._readableState.length === 0) { self.readable = false; maybeDestroy(self); } // push a null to signal the end of data. self.push(null); // internal end event so that we know that the actual socket // is no longer readable, and we can start the shutdown // procedure. No need to wait for all the data to be consumed. self.emit('_socketEnd'); } Socket.prototype._getpeername = function() { if (!this._peername) { if (!this._handle || !this._handle.getpeername) { return {}; } var out = {}; var err = this._handle.getpeername(out); if (err) return {}; // FIXME(bnoordhuis) Throw? this._peername = out; } return this._peername; }; Socket.prototype.__defineGetter__('remoteAddress', function() { return this._getpeername().address; }); Socket.prototype.__defineGetter__('remoteFamily', function() { return this._getpeername().family; }); Socket.prototype.__defineGetter__('remotePort', function() { return this._getpeername().port; }); Socket.prototype._getsockname = function() { if (!this._handle || !this._handle.getsockname) { return {}; } if (!this._sockname) { var out = {}; var err = this._handle.getsockname(out); if (err) return {}; // FIXME(bnoordhuis) Throw? this._sockname = out; } return this._sockname; }; Socket.prototype.__defineGetter__('localAddress', function() { return this._getsockname().address; }); Socket.prototype.__defineGetter__('localPort', function() { return this._getsockname().port; }); Socket.prototype.write = function(chunk, encoding, cb) { if (typeof chunk !== 'string' && !(chunk instanceof Buffer)) throw new TypeError('invalid data'); return stream.Duplex.prototype.write.apply(this, arguments); }; Socket.prototype._writeGeneric = function(writev, data, encoding, cb) { // If we are still connecting, then buffer this for later. // The Writable logic will buffer up any more writes while // waiting for this one to be done. if (this._connecting) { this._pendingData = data; this._pendingEncoding = encoding; this.once('connect', function() { this._writeGeneric(writev, data, encoding, cb); }); return; } this._pendingData = null; this._pendingEncoding = ''; this._unrefTimer(); if (!this._handle) { this._destroy(new Error('This socket is closed.'), cb); return false; } var req = new WriteWrap(); req.handle = this._handle; req.oncomplete = afterWrite; req.async = false; var err; if (writev) { var chunks = new Array(data.length << 1); for (var i = 0; i < data.length; i++) { var entry = data[i]; var chunk = entry.chunk; var enc = entry.encoding; chunks[i * 2] = chunk; chunks[i * 2 + 1] = enc; } err = this._handle.writev(req, chunks); // Retain chunks if (err === 0) req._chunks = chunks; } else { var enc; if (data instanceof Buffer) { req.buffer = data; // Keep reference alive. enc = 'buffer'; } else { enc = encoding; } err = createWriteReq(req, this._handle, data, enc); } if (err) return this._destroy(errnoException(err, 'write', req.error), cb); this._bytesDispatched += req.bytes; // If it was entirely flushed, we can write some more right now. // However, if more is left in the queue, then wait until that clears. if (req.async && this._handle.writeQueueSize != 0) req.cb = cb; else cb(); }; Socket.prototype._writev = function(chunks, cb) { this._writeGeneric(true, chunks, '', cb); }; Socket.prototype._write = function(data, encoding, cb) { this._writeGeneric(false, data, encoding, cb); }; function createWriteReq(req, handle, data, encoding) { switch (encoding) { case 'binary': return handle.writeBinaryString(req, data); case 'buffer': return handle.writeBuffer(req, data); case 'utf8': case 'utf-8': return handle.writeUtf8String(req, data); case 'ascii': return handle.writeAsciiString(req, data); case 'ucs2': case 'ucs-2': case 'utf16le': case 'utf-16le': return handle.writeUcs2String(req, data); default: return handle.writeBuffer(req, new Buffer(data, encoding)); } } Socket.prototype.__defineGetter__('bytesWritten', function() { var bytes = this._bytesDispatched, state = this._writableState, data = this._pendingData, encoding = this._pendingEncoding; state.getBuffer().forEach(function(el) { if (el.chunk instanceof Buffer) bytes += el.chunk.length; else bytes += Buffer.byteLength(el.chunk, el.encoding); }); if (data) { if (data instanceof Buffer) bytes += data.length; else bytes += Buffer.byteLength(data, encoding); } return bytes; }); function afterWrite(status, handle, req, err) { var self = handle.owner; if (self !== process.stderr && self !== process.stdout) debug('afterWrite', status); // callback may come after call to destroy. if (self.destroyed) { debug('afterWrite destroyed'); return; } if (status < 0) { var ex = exceptionWithHostPort(status, 'write', req.address, req.port); debug('write failure', ex); self._destroy(ex, req.cb); return; } self._unrefTimer(); if (self !== process.stderr && self !== process.stdout) debug('afterWrite call cb'); if (req.cb) req.cb.call(self); } function connect(self, address, port, addressType, localAddress, localPort) { // TODO return promise from Socket.prototype.connect which // wraps _connectReq. assert.ok(self._connecting); var err; if (localAddress || localPort) { var bind; if (addressType === 4) { localAddress = localAddress || '0.0.0.0'; bind = self._handle.bind; } else if (addressType === 6) { localAddress = localAddress || '::'; bind = self._handle.bind6; } else { self._destroy(new TypeError('Invalid addressType: ' + addressType)); return; } debug('binding to localAddress: %s and localPort: %d', localAddress, localPort); bind = bind.bind(self._handle); err = bind(localAddress, localPort); if (err) { var ex = exceptionWithHostPort(err, 'bind', localAddress, localPort); self._destroy(ex); return; } } if (addressType === 6 || addressType === 4) { var req = new TCPConnectWrap(); req.oncomplete = afterConnect; req.address = address; req.port = port; if (addressType === 4) err = self._handle.connect(req, address, port); else err = self._handle.connect6(req, address, port); } else { var req = new PipeConnectWrap(); req.address = address; req.oncomplete = afterConnect; err = self._handle.connect(req, address, afterConnect); } if (err) { var sockname = self._getsockname(); var details; if (sockname) { details = sockname.address + ':' + sockname.port; } var ex = exceptionWithHostPort(err, 'connect', address, port, details); self._destroy(ex); } } // Check that the port number is not NaN when coerced to a number, // is an integer and that it falls within the legal range of port numbers. function isLegalPort(port) { if (typeof port === 'string' && port.trim() === '') return false; return +port === (port >>> 0) && port >= 0 && port <= 0xFFFF; } Socket.prototype.connect = function(options, cb) { if (this.write !== Socket.prototype.write) this.write = Socket.prototype.write; if (options === null || typeof options !== 'object') { // Old API: // connect(port, [host], [cb]) // connect(path, [cb]); var args = normalizeConnectArgs(arguments); return Socket.prototype.connect.apply(this, args); } if (this.destroyed) { this._readableState.reading = false; this._readableState.ended = false; this._readableState.endEmitted = false; this._writableState.ended = false; this._writableState.ending = false; this._writableState.finished = false; this._writableState.errorEmitted = false; this.destroyed = false; this._handle = null; this._peername = null; this._sockname = null; } var self = this; var pipe = !!options.path; debug('pipe', pipe, options.path); if (!this._handle) { this._handle = pipe ? new Pipe() : new TCP(); initSocketHandle(this); } if (typeof cb === 'function') { self.once('connect', cb); } this._unrefTimer(); self._connecting = true; self.writable = true; if (pipe) { connect(self, options.path); } else { lookupAndConnect(self, options); } return self; }; function lookupAndConnect(self, options) { const dns = require('dns'); var host = options.host || 'localhost'; var port = options.port; var localAddress = options.localAddress; var localPort = options.localPort; if (localAddress && !exports.isIP(localAddress)) throw new TypeError('localAddress must be a valid IP: ' + localAddress); if (localPort && typeof localPort !== 'number') throw new TypeError('localPort should be a number: ' + localPort); if (typeof port !== 'undefined') { if (typeof port !== 'number' && typeof port !== 'string') throw new TypeError('port should be a number or string: ' + port); if (!isLegalPort(port)) throw new RangeError('port should be >= 0 and < 65536: ' + port); } port |= 0; // If host is an IP, skip performing a lookup // TODO(evanlucas) should we hot path this for localhost? var addressType = exports.isIP(host); if (addressType) { process.nextTick(function() { if (self._connecting) connect(self, host, port, addressType, localAddress, localPort); }); return; } if (options.lookup && typeof options.lookup !== 'function') throw new TypeError('options.lookup should be a function.'); var dnsopts = { family: options.family, hints: 0 }; if (dnsopts.family !== 4 && dnsopts.family !== 6) { dnsopts.hints = dns.ADDRCONFIG; // The AI_V4MAPPED hint is not supported on FreeBSD, and getaddrinfo // returns EAI_BADFLAGS. However, it seems to be supported on most other // systems. See // http://lists.freebsd.org/pipermail/freebsd-bugs/2008-February/028260.html // for more information on the lack of support for FreeBSD. if (process.platform !== 'freebsd') dnsopts.hints |= dns.V4MAPPED; } debug('connect: find host ' + host); debug('connect: dns options', dnsopts); self._host = host; var lookup = options.lookup || dns.lookup; lookup(host, dnsopts, function(err, ip, addressType) { self.emit('lookup', err, ip, addressType); // It's possible we were destroyed while looking this up. // XXX it would be great if we could cancel the promise returned by // the look up. if (!self._connecting) return; if (err) { // net.createConnection() creates a net.Socket object and // immediately calls net.Socket.connect() on it (that's us). // There are no event listeners registered yet so defer the // error event to the next tick. err.host = options.host; err.port = options.port; err.message = err.message + ' ' + options.host + ':' + options.port; process.nextTick(connectErrorNT, self, err); } else { self._unrefTimer(); connect(self, ip, port, addressType, localAddress, localPort); } }); } function connectErrorNT(self, err) { self.emit('error', err); self._destroy(); } Socket.prototype.ref = function() { if (!this._handle) { this.once('connect', this.ref); return this; } this._handle.ref(); return this; }; Socket.prototype.unref = function() { if (!this._handle) { this.once('connect', this.unref); return this; } this._handle.unref(); return this; }; function afterConnect(status, handle, req, readable, writable) { var self = handle.owner; // callback may come after call to destroy if (self.destroyed) { return; } // Update handle if it was wrapped // TODO(indutny): assert that the handle is actually an ancestor of old one handle = self._handle; debug('afterConnect'); assert.ok(self._connecting); self._connecting = false; self._sockname = null; if (status == 0) { self.readable = readable; self.writable = writable; self._unrefTimer(); self.emit('connect'); // start the first read, or get an immediate EOF. // this doesn't actually consume any bytes, because len=0. if (readable && !self.isPaused()) self.read(0); } else { self._connecting = false; var details; if (req.localAddress && req.localPort) { ex.localAddress = req.localAddress; ex.localPort = req.localPort; details = ex.localAddress + ':' + ex.localPort; } var ex = exceptionWithHostPort(status, 'connect', req.address, req.port, details); self._destroy(ex); } } function Server(options, connectionListener) { if (!(this instanceof Server)) return new Server(options, connectionListener); events.EventEmitter.call(this); var self = this; var options; if (typeof options === 'function') { connectionListener = options; options = {}; self.on('connection', connectionListener); } else { options = options || {}; if (typeof connectionListener === 'function') { self.on('connection', connectionListener); } } this._connections = 0; Object.defineProperty(this, 'connections', { get: internalUtil.deprecate(function() { if (self._usingSlaves) { return null; } return self._connections; }, 'Server.connections property is deprecated. ' + 'Use Server.getConnections method instead.'), set: internalUtil.deprecate(function(val) { return (self._connections = val); }, 'Server.connections property is deprecated.'), configurable: true, enumerable: false }); this._handle = null; this._usingSlaves = false; this._slaves = []; this._unref = false; this.allowHalfOpen = options.allowHalfOpen || false; this.pauseOnConnect = !!options.pauseOnConnect; } util.inherits(Server, events.EventEmitter); exports.Server = Server; function toNumber(x) { return (x = Number(x)) >= 0 ? x : false; } function _listen(handle, backlog) { // Use a backlog of 512 entries. We pass 511 to the listen() call because // the kernel does: backlogsize = roundup_pow_of_two(backlogsize + 1); // which will thus give us a backlog of 512 entries. return handle.listen(backlog || 511); } var createServerHandle = exports._createServerHandle = function(address, port, addressType, fd) { var err = 0; // assign handle in listen, and clean up if bind or listen fails var handle; var isTCP = false; if (typeof fd === 'number' && fd >= 0) { try { handle = createHandle(fd); } catch (e) { // Not a fd we can listen on. This will trigger an error. debug('listen invalid fd=' + fd + ': ' + e.message); return uv.UV_EINVAL; } handle.open(fd); handle.readable = true; handle.writable = true; assert(!address && !port); } else if (port === -1 && addressType === -1) { handle = new Pipe(); if (process.platform === 'win32') { var instances = parseInt(process.env.NODE_PENDING_PIPE_INSTANCES); if (!isNaN(instances)) { handle.setPendingInstances(instances); } } } else { handle = new TCP(); isTCP = true; } if (address || port || isTCP) { debug('bind to ' + (address || 'anycast')); if (!address) { // Try binding to ipv6 first err = handle.bind6('::', port); if (err) { handle.close(); // Fallback to ipv4 return createServerHandle('0.0.0.0', port); } } else if (addressType === 6) { err = handle.bind6(address, port); } else { err = handle.bind(address, port); } } if (err) { handle.close(); return err; } return handle; }; Server.prototype._listen2 = function(address, port, addressType, backlog, fd) { debug('listen2', address, port, addressType, backlog, fd); var self = this; // If there is not yet a handle, we need to create one and bind. // In the case of a server sent via IPC, we don't need to do this. if (self._handle) { debug('_listen2: have a handle already'); } else { debug('_listen2: create a handle'); var rval = null; if (!address && typeof fd !== 'number') { rval = createServerHandle('::', port, 6, fd); if (typeof rval === 'number') { rval = null; address = '0.0.0.0'; addressType = 4; } else { address = '::'; addressType = 6; } } if (rval === null) rval = createServerHandle(address, port, addressType, fd); if (typeof rval === 'number') { var error = exceptionWithHostPort(rval, 'listen', address, port); process.nextTick(emitErrorNT, self, error); return; } self._handle = rval; } self._handle.onconnection = onconnection; self._handle.owner = self; var err = _listen(self._handle, backlog); if (err) { var ex = exceptionWithHostPort(err, 'listen', address, port); self._handle.close(); self._handle = null; process.nextTick(emitErrorNT, self, ex); return; } // generate connection key, this should be unique to the connection this._connectionKey = addressType + ':' + address + ':' + port; // unref the handle if the server was unref'ed prior to listening if (this._unref) this.unref(); process.nextTick(emitListeningNT, self); }; function emitErrorNT(self, err) { self.emit('error', err); } function emitListeningNT(self) { // ensure handle hasn't closed if (self._handle) self.emit('listening'); } function listen(self, address, port, addressType, backlog, fd, exclusive) { exclusive = !!exclusive; if (!cluster) cluster = require('cluster'); if (cluster.isMaster || exclusive) { self._listen2(address, port, addressType, backlog, fd); return; } cluster._getServer(self, address, port, addressType, fd, cb); function cb(err, handle) { // EADDRINUSE may not be reported until we call listen(). To complicate // matters, a failed bind() followed by listen() will implicitly bind to // a random port. Ergo, check that the socket is bound to the expected // port before calling listen(). // // FIXME(bnoordhuis) Doesn't work for pipe handles, they don't have a // getsockname() method. Non-issue for now, the cluster module doesn't // really support pipes anyway. if (err === 0 && port > 0 && handle.getsockname) { var out = {}; err = handle.getsockname(out); if (err === 0 && port !== out.port) err = uv.UV_EADDRINUSE; } if (err) { var ex = exceptionWithHostPort(err, 'bind', address, port); return self.emit('error', ex); } self._handle = handle; self._listen2(address, port, addressType, backlog, fd); } } Server.prototype.listen = function() { var self = this; var lastArg = arguments[arguments.length - 1]; if (typeof lastArg === 'function') { self.once('listening', lastArg); } var port = toNumber(arguments[0]); // The third optional argument is the backlog size. // When the ip is omitted it can be the second argument. var backlog = toNumber(arguments[1]) || toNumber(arguments[2]); if (arguments.length === 0 || typeof arguments[0] === 'function') { // Bind to a random port. listen(self, null, 0, null, backlog); } else if (arguments[0] !== null && typeof arguments[0] === 'object') { var h = arguments[0]; h = h._handle || h.handle || h; if (h instanceof TCP) { self._handle = h; listen(self, null, -1, -1, backlog); } else if (typeof h.fd === 'number' && h.fd >= 0) { listen(self, null, null, null, backlog, h.fd); } else { // The first argument is a configuration object if (h.backlog) backlog = h.backlog; if (typeof h.port === 'number' || typeof h.port === 'string' || (typeof h.port === 'undefined' && 'port' in h)) { // Undefined is interpreted as zero (random port) for consistency // with net.connect(). if (typeof h.port !== 'undefined' && !isLegalPort(h.port)) throw new RangeError('port should be >= 0 and < 65536: ' + h.port); if (h.host) listenAfterLookup(h.port | 0, h.host, backlog, h.exclusive); else listen(self, null, h.port | 0, 4, backlog, undefined, h.exclusive); } else if (h.path && isPipeName(h.path)) { var pipeName = self._pipeName = h.path; listen(self, pipeName, -1, -1, backlog, undefined, h.exclusive); } else { throw new Error('Invalid listen argument: ' + h); } } } else if (isPipeName(arguments[0])) { // UNIX socket or Windows pipe. var pipeName = self._pipeName = arguments[0]; listen(self, pipeName, -1, -1, backlog); } else if (arguments[1] === undefined || typeof arguments[1] === 'function' || typeof arguments[1] === 'number') { // The first argument is the port, no IP given. listen(self, null, port, 4, backlog); } else { // The first argument is the port, the second an IP. listenAfterLookup(port, arguments[1], backlog); } function listenAfterLookup(port, address, backlog, exclusive) { require('dns').lookup(address, function(err, ip, addressType) { if (err) { self.emit('error', err); } else { addressType = ip ? addressType : 4; listen(self, ip, port, addressType, backlog, undefined, exclusive); } }); } return self; }; Server.prototype.address = function() { if (this._handle && this._handle.getsockname) { var out = {}; this._handle.getsockname(out); // TODO(bnoordhuis) Check err and throw? return out; } else if (this._pipeName) { return this._pipeName; } else { return null; } }; function onconnection(err, clientHandle) { var handle = this; var self = handle.owner; debug('onconnection'); if (err) { self.emit('error', errnoException(err, 'accept')); return; } if (self.maxConnections && self._connections >= self.maxConnections) { clientHandle.close(); return; } var socket = new Socket({ handle: clientHandle, allowHalfOpen: self.allowHalfOpen, pauseOnCreate: self.pauseOnConnect }); socket.readable = socket.writable = true; self._connections++; socket.server = self; DTRACE_NET_SERVER_CONNECTION(socket); LTTNG_NET_SERVER_CONNECTION(socket); COUNTER_NET_SERVER_CONNECTION(socket); self.emit('connection', socket); } Server.prototype.getConnections = function(cb) { function end(err, connections) { process.nextTick(cb, err, connections); } if (!this._usingSlaves) { return end(null, this._connections); } // Poll slaves var left = this._slaves.length, total = this._connections; function oncount(err, count) { if (err) { left = -1; return end(err); } total += count; if (--left === 0) return end(null, total); } this._slaves.forEach(function(slave) { slave.getConnections(oncount); }); }; Server.prototype.close = function(cb) { function onSlaveClose() { if (--left !== 0) return; self._connections = 0; self._emitCloseIfDrained(); } if (typeof cb === 'function') { if (!this._handle) { this.once('close', function() { cb(new Error('Not running')); }); } else { this.once('close', cb); } } if (this._handle) { this._handle.close(); this._handle = null; } if (this._usingSlaves) { var self = this, left = this._slaves.length; // Increment connections to be sure that, even if all sockets will be closed // during polling of slaves, `close` event will be emitted only once. this._connections++; // Poll slaves this._slaves.forEach(function(slave) { slave.close(onSlaveClose); }); } else { this._emitCloseIfDrained(); } return this; }; Server.prototype._emitCloseIfDrained = function() { debug('SERVER _emitCloseIfDrained'); var self = this; if (self._handle || self._connections) { debug('SERVER handle? %j connections? %d', !!self._handle, self._connections); return; } process.nextTick(emitCloseNT, self); }; function emitCloseNT(self) { debug('SERVER: emit close'); self.emit('close'); } Server.prototype.listenFD = internalUtil.deprecate(function(fd, type) { return this.listen({ fd: fd }); }, 'Server.listenFD is deprecated. Use Server.listen({fd: }) instead.'); Server.prototype._setupSlave = function(socketList) { this._usingSlaves = true; this._slaves.push(socketList); }; Server.prototype.ref = function() { this._unref = false; if (this._handle) this._handle.ref(); return this; }; Server.prototype.unref = function() { this._unref = true; if (this._handle) this._handle.unref(); return this; }; exports.isIP = cares.isIP; exports.isIPv4 = function(input) { return exports.isIP(input) === 4; }; exports.isIPv6 = function(input) { return exports.isIP(input) === 6; }; if (process.platform === 'win32') { var simultaneousAccepts; exports._setSimultaneousAccepts = function(handle) { if (handle === undefined) { return; } if (simultaneousAccepts === undefined) { simultaneousAccepts = (process.env.NODE_MANY_ACCEPTS && process.env.NODE_MANY_ACCEPTS !== '0'); } if (handle._simultaneousAccepts !== simultaneousAccepts) { handle.setSimultaneousAccepts(simultaneousAccepts); handle._simultaneousAccepts = simultaneousAccepts; } }; } else { exports._setSimultaneousAccepts = function(handle) {}; }