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var util = require('util');

var events = require('events');

var stream = require('stream');

var kMinPoolSpace = 128;

var kPoolSize = 40 * 1024;

var debugLevel = parseInt(process.env.NODE_DEBUG, 16);

var debug;

if (debugLevel & 0x2) {

debug = function(x) { util.error.apply(this, arguments); };

} else {

debug = function() { };

}

var binding = process.binding('net');

// Note about Buffer interface:

// I'm attempting to do the simplest possible interface to abstracting raw

// memory allocation. This might turn out to be too simple - it seems that

// I always use a buffer.used member to keep track of how much I've filled.

// Perhaps giving the Buffer a file-like interface with a head (which would

// represent buffer.used) that can be seeked around would be easier. I'm not

// yet convinced that every use-case can be fit into that abstraction, so

// waiting to implement it until I get more experience with this.

var FreeList = require('freelist').FreeList;

var IOWatcher = process.binding('io_watcher').IOWatcher;

var constants = process.binding('constants');

var assert = process.assert;

var socket = binding.socket;

var bind = binding.bind;

var connect = binding.connect;

var listen = binding.listen;

var accept = binding.accept;

var close = binding.close;

var shutdown = binding.shutdown;

var read = binding.read;

var write = binding.write;

var toRead = binding.toRead;

var setNoDelay = binding.setNoDelay;

var setKeepAlive = binding.setKeepAlive;

var socketError = binding.socketError;

var getsockname = binding.getsockname;

var errnoException = binding.errnoException;

var sendMsg = binding.sendMsg;

var recvMsg = binding.recvMsg;

var EINPROGRESS = constants.EINPROGRESS;

var ENOENT = constants.ENOENT;

var EMFILE = constants.EMFILE;

var END_OF_FILE = 42;

var ioWatchers = new FreeList('iowatcher', 100, function() {

return new IOWatcher();

});

exports.isIP = binding.isIP;

exports.isIPv4 = function(input) {

if (binding.isIP(input) === 4) {

return true;

}

return false;

};

exports.isIPv6 = function(input) {

if (binding.isIP(input) === 6) {

return true;

}

return false;

};

// Allocated on demand.

var pool = null;

function allocNewPool() {

pool = new Buffer(kPoolSize);

pool.used = 0;

}

var emptyBuffer = null;

function allocEmptyBuffer() {

emptyBuffer = new Buffer(1);

emptyBuffer.sent = 0;

emptyBuffer.length = 0;

}

function setImplmentationMethods(self) {

function noData(buf, off, len) {

return !buf ||

(off != undefined && off >= buf.length) ||

(len == 0);

};

if (self.type == 'unix') {

self._writeImpl = function(buf, off, len, fd, flags) {

// Detect and disallow zero-byte writes wth an attached file

// descriptor. This is an implementation limitation of sendmsg(2).

if (fd && noData(buf, off, len)) {

throw new Error('File descriptors can only be written with data');

}

return sendMsg(self.fd, buf, off, len, fd, flags);

};

self._readImpl = function(buf, off, len) {

var bytesRead = recvMsg(self.fd, buf, off, len);

// Do not emit this in the same stack, otherwise we risk corrupting our

// buffer pool which is full of read data, but has not had had its

// pointers updated just yet.

// Save off recvMsg.fd in a closure so that, when we emit it later, we're

// emitting the same value that we see now. Otherwise, we can end up

// calling emit() after recvMsg() has been called again and end up

// emitting null (or another FD).

if (recvMsg.fd !== null) {

var fd = recvMsg.fd;

process.nextTick(function() {

self.emit('fd', fd);

});

}

return bytesRead;

};

} else {

self._writeImpl = function(buf, off, len, fd, flags) {

// XXX: TLS support requires that 0-byte writes get processed

// by the kernel for some reason. Otherwise, we'd just

// fast-path return here.

// Drop 'fd' and 'flags' as these are not supported by the write(2)

// system call

return write(self.fd, buf, off, len);

};

self._readImpl = function(buf, off, len) {

return read(self.fd, buf, off, len);

};

}

self._shutdownImpl = function() {

shutdown(self.fd, 'write');

};

}

function onReadable(readable, writable) {

assert(this.socket);

var socket = this.socket;

socket._onReadable();

}

function onWritable(readable, writable) {

assert(this.socket);

var socket = this.socket;

if (socket._connecting) {

assert(socket.writable);

socket._onConnect();

} else {

socket._onWritable();

}

function initStream(self) {

self._readWatcher = ioWatchers.alloc();

self._readWatcher.socket = self;

self._readWatcher.callback = onReadable;

self.readable = false;

// Queue of buffers and string that need to be written to socket.

self._writeQueue = [];

self._writeQueueEncoding = [];

self._writeQueueFD = [];

self._writeQueueCallbacks = [];

self._writeWatcher = ioWatchers.alloc();

self._writeWatcher.socket = self;

self._writeWatcher.callback = onWritable;

self.writable = false;

}

// Deprecated API: Stream(fd, type)

// New API: Stream({ fd: 10, type: 'unix', allowHalfOpen: true })

function Stream(options) {

if (!(this instanceof Stream)) return new Stream(arguments[0], arguments[1]);

stream.Stream.call(this);

this.fd = null;

this.type = null;

this.allowHalfOpen = false;

if (typeof options == 'object') {

this.fd = options.fd !== undefined ? parseInt(options.fd, 10) : null;

this.type = options.type || null;

this.allowHalfOpen = options.allowHalfOpen || false;

} else if (typeof options == 'number') {

this.fd = arguments[0];

this.type = arguments[1];

}

if (parseInt(this.fd, 10) >= 0) {

this.open(this.fd, this.type);

} else {

setImplmentationMethods(this);

}

util.inherits(Stream, stream.Stream);

exports.Stream = Stream;

Stream.prototype._onTimeout = function() {

this.emit('timeout');

};

Stream.prototype.open = function(fd, type) {

initStream(this);

this.fd = fd;

this.type = type || null;

this.readable = true;

setImplmentationMethods(this);

this._writeWatcher.set(this.fd, false, true);

this.writable = true;

};

exports.createConnection = function(port, host) {

var s = new Stream();

s.connect(port, host);

return s;

};

Object.defineProperty(Stream.prototype, 'readyState', {

get: function() {

if (this._connecting) {

return 'opening';

} else if (this.readable && this.writable) {

assert(typeof this.fd == 'number');

return 'open';

} else if (this.readable && !this.writable) {

assert(typeof this.fd == 'number');

return 'readOnly';

} else if (!this.readable && this.writable) {

assert(typeof this.fd == 'number');

return 'writeOnly';

} else {

assert(typeof this.fd != 'number');

return 'closed';

}

});

// Returns true if all the data was flushed to socket. Returns false if

// something was queued. If data was queued, then the 'drain' event will

// signal when it has been finally flushed to socket.

Stream.prototype.write = function(data /* [encoding], [fd], [cb] */) {

var encoding, fd, cb;

// parse arguments

if (typeof arguments[1] == 'string') {

encoding = arguments[1];

if (typeof arguments[2] == 'number') {

fd = arguments[2];

cb = arguments[3];

} else {

cb = arguments[2];

}

} else if (typeof arguments[1] == 'number') {

fd = arguments[1];

cb = arguments[2];

} else if (typeof arguments[2] == 'number') {

// This case is to support old calls when the encoding argument

// was not optional: s.write(buf, undefined, pipeFDs[1])

encoding = arguments[1];

fd = arguments[2];

cb = arguments[3];

} else {

cb = arguments[1];

}

// TODO - actually use cb

if (this._connecting || (this._writeQueue && this._writeQueue.length)) {

if (!this._writeQueue) {

this._writeQueue = [];

this._writeQueueEncoding = [];

this._writeQueueFD = [];

this._writeQueueCallbacks = [];

}

// Slow. There is already a write queue, so let's append to it.

if (this._writeQueueLast() === END_OF_FILE) {

throw new Error('Stream.end() called already; cannot write.');

}

var last = this._writeQueue.length - 1;

if (typeof data == 'string' &&

this._writeQueue.length &&

typeof this._writeQueue[last] === 'string' &&

this._writeQueueEncoding[last] === encoding) {

// optimization - concat onto last

this._writeQueue[last] += data;

if (cb) {

if (!this._writeQueueCallbacks[last]) {

this._writeQueueCallbacks[last] = cb;

} else {

// awful

this._writeQueueCallbacks[last] = function () {

this._writeQueueCallbacks[last]();

cb();

};

}

} else {

this._writeQueue.push(data);

this._writeQueueEncoding.push(encoding);

this._writeQueueCallbacks.push(cb);

}

if (fd != undefined) {

this._writeQueueFD.push(fd);

}

return false;

} else {

// Fast.

// The most common case. There is no write queue. Just push the data

// directly to the socket.

return this._writeOut(data, encoding, fd, cb);

}

};

// Directly writes the data to socket.

// Steps:

// 1. If it's a string, write it to the `pool`. (If not space remains

// on the pool make a new one.)

// 2. Write data to socket. Return true if flushed.

// 3. Slice out remaining

// 4. Unshift remaining onto _writeQueue. Return false.

Stream.prototype._writeOut = function(data, encoding, fd, cb) {

if (!this.writable) {

throw new Error('Stream is not writable');

}

var buffer, off, len;

var bytesWritten, charsWritten;

var queuedData = false;

if (typeof data != 'string') {

// 'data' is a buffer, ignore 'encoding'

buffer = data;

off = 0;

len = data.length;

} else {

assert(typeof data == 'string');

if (!pool || pool.length - pool.used < kMinPoolSpace) {

pool = null;

allocNewPool();

}

if (!encoding || encoding == 'utf8' || encoding == 'utf-8') {

// default to utf8

bytesWritten = pool.write(data, 'utf8', pool.used);

charsWritten = Buffer._charsWritten;

} else {

bytesWritten = pool.write(data, encoding, pool.used);

charsWritten = bytesWritten;

}

if (encoding && data.length > 0) {

assert(bytesWritten > 0);

}

buffer = pool;

len = bytesWritten;

off = pool.used;

pool.used += bytesWritten;

debug('wrote ' + bytesWritten + ' bytes to pool');

if (charsWritten != data.length) {

// debug('couldn't fit ' +

// (data.length - charsWritten) +

// ' bytes into the pool\n');

// Unshift whatever didn't fit onto the buffer

this._writeQueue.unshift(data.slice(charsWritten));

this._writeQueueEncoding.unshift(encoding);

this._writeQueueCallbacks.unshift(cb);

this._writeWatcher.start();

queuedData = true;

}

try {

bytesWritten = this._writeImpl(buffer, off, len, fd, 0);

} catch (e) {

this.destroy(e);

return false;

}

debug('wrote ' + bytesWritten + ' to socket. [fd, off, len] = ' +

JSON.stringify([this.fd, off, len]) + '\n');

require('timers').active(this);

if (bytesWritten == len) {

// awesome. sent to buffer.

if (buffer === pool) {

// If we're just writing from the pool then we can make a little

// optimization and save the space.

buffer.used -= len;

}

if (queuedData) {

return false;

} else {

if (cb) cb();

return true;

}

// Didn't write the entire thing to buffer.

// Need to wait for the socket to become available before trying again.

this._writeWatcher.start();

// Slice out the data left.

var leftOver = buffer.slice(off + bytesWritten, off + len);

leftOver.used = leftOver.length; // used the whole thing...

// util.error('data.used = ' + data.used);

//if (!this._writeQueue) initWriteStream(this);

// data should be the next thing to write.

this._writeQueue.unshift(leftOver);

this._writeQueueEncoding.unshift(null);

this._writeQueueCallbacks.unshift(cb);

// If didn't successfully write any bytes, enqueue our fd and try again

if (!bytesWritten) {

this._writeQueueFD.unshift(fd);

}

return false;

};

// Flushes the write buffer out.

// Returns true if the entire buffer was flushed.

Stream.prototype.flush = function() {

while (this._writeQueue && this._writeQueue.length) {

var data = this._writeQueue.shift();

var encoding = this._writeQueueEncoding.shift();

var cb = this._writeQueueCallbacks.shift();

var fd = this._writeQueueFD.shift();

if (data === END_OF_FILE) {

this._shutdown();

return true;

}

var flushed = this._writeOut(data, encoding, fd, cb);

if (!flushed) return false;

}

if (this._writeWatcher) this._writeWatcher.stop();

return true;

};

Stream.prototype._writeQueueLast = function() {

return this._writeQueue.length > 0 ?

this._writeQueue[this._writeQueue.length - 1] : null;

};

Stream.prototype.setEncoding = function(encoding) {

var StringDecoder = require('string_decoder').StringDecoder; // lazy load

this._decoder = new StringDecoder(encoding);

};

function doConnect(socket, port, host) {

try {

connect(socket.fd, port, host);

} catch (e) {

socket.destroy(e);

return;

}

debug('connecting to ' + host + ' : ' + port);

// Don't start the read watcher until connection is established

socket._readWatcher.set(socket.fd, true, false);

// How to connect on POSIX: Wait for fd to become writable, then call

// socketError() if there isn't an error, we're connected. AFAIK this a

// platform independent way determining when a non-blocking connection

// is established, but I have only seen it documented in the Linux

// Manual Page connect(2) under the error code EINPROGRESS.

socket._writeWatcher.set(socket.fd, false, true);

socket._writeWatcher.start();

}

function toPort(x) { return (x = Number(x)) >= 0 ? x : false; }

Stream.prototype._onConnect = function() {

var errno = socketError(this.fd);

if (errno == 0) {

// connection established

this._connecting = false;

this.resume();

assert(this.writable);

this.readable = this.writable = true;

try {

this.emit('connect');

} catch (e) {

this.destroy(e);

return;

}

if (this._writeQueue && this._writeQueue.length) {

// Flush this in case any writes are queued up while connecting.

this._onWritable();

}

} else if (errno != EINPROGRESS) {

this.destroy(errnoException(errno, 'connect'));

}

};

Stream.prototype._onWritable = function() {

// Stream becomes writable on connect() but don't flush if there's

// nothing actually to write

if (this.flush()) {

if (this._events && this._events['drain']) this.emit('drain');

if (this.ondrain) this.ondrain(); // Optimization

}

};

Stream.prototype._onReadable = function() {

var self = this;

// If this is the first recv (pool doesn't exist) or we've used up

// most of the pool, allocate a new one.

if (!pool || pool.length - pool.used < kMinPoolSpace) {

// discard the old pool. Can't add to the free list because

// users might have refernces to slices on it.

pool = null;

allocNewPool();

}

//debug('pool.used ' + pool.used);

var bytesRead;

try {

bytesRead = self._readImpl(pool,

pool.used,

pool.length - pool.used);

} catch (e) {

self.destroy(e);

return;

}

// Note that some _readImpl() implementations return -1 bytes

// read as an indication not to do any processing on the result

// (but not an error).

if (bytesRead === 0) {

self.readable = false;

self._readWatcher.stop();

if (!self.writable) self.destroy();

// Note: 'close' not emitted until nextTick.

if (!self.allowHalfOpen) self.end();

if (self._events && self._events['end']) self.emit('end');

if (self.onend) self.onend();

} else if (bytesRead > 0) {

require('timers').active(self);

var start = pool.used;

var end = pool.used + bytesRead;

pool.used += bytesRead;

if (self._decoder) {

// emit String

var string = self._decoder.write(pool.slice(start, end));

if (string.length) self.emit('data', string);

} else {

// emit buffer

if (self._events && self._events['data']) {

// emit a slice

self.emit('data', pool.slice(start, end));

}

// Optimization: emit the original buffer with end points

if (self.ondata) self.ondata(pool, start, end);

}

};

// var stream = new Stream();

// stream.connect(80) - TCP connect to port 80 on the localhost

// stream.connect(80, 'nodejs.org') - TCP connect to port 80 on nodejs.org

// stream.connect('/tmp/socket') - UNIX connect to socket specified by path

Stream.prototype.connect = function() {

var self = this;

initStream(self);

if (self.fd) throw new Error('Stream already opened');

if (!self._readWatcher) throw new Error('No readWatcher');

require('timers').active(socket);

self._connecting = true; // set false in doConnect

self.writable = true;

var lastArg = arguments[arguments.length - 1];

if (typeof lastArg == 'function') {

self.addListener('connect', lastArg);

}

var port = toPort(arguments[0]);

if (port === false) {

// UNIX

self.fd = socket('unix');

self.type = 'unix';

setImplmentationMethods(this);

doConnect(self, arguments[0]);

} else {

// TCP

require('dns').lookup(arguments[1], function(err, ip, addressType) {

if (err) {

self.emit('error', err);

} else {

self.type = addressType == 4 ? 'tcp4' : 'tcp6';

self.fd = socket(self.type);

doConnect(self, port, ip);

}

});

}

};

Stream.prototype.address = function() {

return getsockname(this.fd);

};

Stream.prototype.setNoDelay = function(v) {

if ((this.type == 'tcp4') || (this.type == 'tcp6')) {

setNoDelay(this.fd, v);

}

};

Stream.prototype.setKeepAlive = function(enable, time) {

if ((this.type == 'tcp4') || (this.type == 'tcp6')) {

var secondDelay = Math.ceil(time / 1000);

setKeepAlive(this.fd, enable, secondDelay);

}

};

Stream.prototype.setTimeout = function(msecs) {

if (msecs > 0) {

require('timers').enroll(this, msecs);

if (this.fd) { require('timers').active(this); }

} else if (msecs === 0) {

require('timers').unenroll(this);

}

};

Stream.prototype.pause = function() {

this._readWatcher.stop();

};

Stream.prototype.resume = function() {

if (this.fd === null) throw new Error('Cannot resume() closed Stream.');

this._readWatcher.stop();

this._readWatcher.set(this.fd, true, false);

this._readWatcher.start();

};

Stream.prototype.destroy = function(exception) {

// pool is shared between sockets, so don't need to free it here.

var self = this;

// TODO would like to set _writeQueue to null to avoid extra object alloc,

// but lots of code assumes this._writeQueue is always an array.

this._writeQueue = [];

this.readable = this.writable = false;

if (this._writeWatcher) {

this._writeWatcher.stop();

this._writeWatcher.socket = null;

ioWatchers.free(this._writeWatcher);

this._writeWatcher = null;

}

if (this._readWatcher) {

this._readWatcher.stop();

this._readWatcher.socket = null;

ioWatchers.free(this._readWatcher);

this._readWatcher = null;

}

require('timers').unenroll(this);

if (this.server) {

this.server.connections--;

}

// FIXME Bug when this.fd == 0

if (typeof this.fd == 'number') {

close(this.fd);

this.fd = null;

process.nextTick(function() {

if (exception) self.emit('error', exception);

self.emit('close', exception ? true : false);

});

}

};

Stream.prototype._shutdown = function() {

if (!this.writable) {

throw new Error('The connection is not writable');

} else {

// readable and writable

this.writable = false;

if (this.readable) {

try {

this._shutdownImpl();

} catch (e) {

this.destroy(e);

}

} else {

// writable but not readable

this.destroy();

}

};

Stream.prototype.end = function(data, encoding) {

if (this.writable) {

if (this._writeQueueLast() !== END_OF_FILE) {

if (data) this.write(data, encoding);

this._writeQueue.push(END_OF_FILE);

if (!this._connecting) {

this.flush();

}

};

function Server(/* [ options, ] listener */) {

if (!(this instanceof Server)) return new Server(arguments[0], arguments[1]);

events.EventEmitter.call(this);

var self = this;

var options = {};

if (typeof arguments[0] == 'object') {

options = arguments[0];

}

// listener: find the last argument that is a function

for (var l = arguments.length - 1; l >= 0; l--) {

if (typeof arguments[l] == 'function') {

self.addListener('connection', arguments[l]);

}

if (arguments[l] !== undefined) break;

}

self.connections = 0;

self.allowHalfOpen = options.allowHalfOpen || false;

self.watcher = new IOWatcher();

self.watcher.host = self;

self.watcher.callback = function() {

// Just in case we don't have a dummy fd.

getDummyFD();

if (self._pauseTimer) {

// Somehow the watcher got started again. Need to wait until

// the timer finishes.

self.watcher.stop();

}

while (self.fd) {

try {

var peerInfo = accept(self.fd);

} catch (e) {

if (e.errno != EMFILE) throw e;

// Gracefully reject pending clients by freeing up a file

// descriptor.

rescueEMFILE(function() {

self._rejectPending();

});

return;

}

if (!peerInfo) return;

if (self.maxConnections && self.connections >= self.maxConnections) {

// Close the connection we just had

close(peerInfo.fd);

// Reject all other pending connectins.

self._rejectPending();

return;

}

self.connections++;

var options = { fd: peerInfo.fd,

type: self.type,

allowHalfOpen: self.allowHalfOpen };

var s = new Stream(options);

s.remoteAddress = peerInfo.address;

s.remotePort = peerInfo.port;

s.type = self.type;

s.server = self;

s.resume();

self.emit('connection', s);

// The 'connect' event probably should be removed for server-side

// sockets. It's redundant.

try {

s.emit('connect');

} catch (e) {

s.destroy(e);

return;

}

};

}

util.inherits(Server, events.EventEmitter);

exports.Server = Server;

exports.createServer = function() {

return new Server(arguments[0], arguments[1]);

};

// Just stop trying to accepting connections for a while.

// Useful for throttling against DoS attacks.

Server.prototype.pause = function(msecs) {

// We're already paused.

if (this._pauseTimer) return;

var self = this;

msecs = msecs || 1000;

this.watcher.stop();

// Wait a second before accepting more.

this._pauseTimer = setTimeout(function() {

// Our fd should still be there. If someone calls server.close() then

// the pauseTimer should be cleared.

assert(parseInt(self.fd) >= 0);

self._pauseTimer = null;

self.watcher.start();

}, msecs);

};

Server.prototype._rejectPending = function() {

var self = this;

var acceptCount = 0;

// Accept and close the waiting clients one at a time.

// Single threaded programming ftw.

while (true) {

var peerInfo = accept(this.fd);

if (!peerInfo) return;

close(peerInfo.fd);

// Don't become DoS'd by incoming requests

if (++acceptCount > 50) {

this.pause();

return;

}

};

// Listen on a UNIX socket

// server.listen('/tmp/socket');

// Listen on port 8000, accept connections from INADDR_ANY.

// server.listen(8000);

// Listen on port 8000, accept connections to '192.168.1.2'

// server.listen(8000, '192.168.1.2');

Server.prototype.listen = function() {

var self = this;

if (self.fd) throw new Error('Server already opened');

var lastArg = arguments[arguments.length - 1];

if (typeof lastArg == 'function') {

self.addListener('listening', lastArg);

}

var port = toPort(arguments[0]);

if (arguments.length == 0 || typeof arguments[0] == 'function') {

// Don't bind(). OS will assign a port with INADDR_ANY.

// The port can be found with server.address()

self.type = 'tcp4';

self.fd = socket(self.type);

self._doListen(port);

} else if (port === false) {

// the first argument specifies a path

self.fd = socket('unix');

self.type = 'unix';

var path = arguments[0];

self.path = path;

// unlink sockfile if it exists

require('fs').stat(path, function(err, r) {

if (err) {

if (err.errno == ENOENT) {

self._doListen(path);

} else {

throw r;

}

} else {

if (!r.isSocket()) {

throw new Error('Non-socket exists at ' + path);

} else {

require('fs').unlink(path, function(err) {

if (err) throw err;

self._doListen(path);

});

}

});

} else {

// the first argument is the port, the second an IP

require('dns').lookup(arguments[1], function(err, ip, addressType) {

if (err) {

self.emit('error', err);

} else {

self.type = addressType == 4 ? 'tcp4' : 'tcp6';

self.fd = socket(self.type);

self._doListen(port, ip);

}

});

}

};

Server.prototype.listenFD = function(fd, type) {

if (this.fd) {

throw new Error('Server already opened');

}

this.fd = fd;

this.type = type || null;

this._startWatcher();

};

Server.prototype._startWatcher = function() {

this.watcher.set(this.fd, true, false);

this.watcher.start();

this.emit('listening');

};

Server.prototype._doListen = function() {

var self = this;

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node/lib/net.js at https · reado/node · GitHub

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