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1598 lines (1274 loc) · 39.4 KB
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'use strict';
const EventEmitter = require('events');
const stream = require('stream');
const timers = require('timers');
const util = require('util');
const internalUtil = require('internal/util');
const internalNet = require('internal/net');
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;
const isLegalPort = internalNet.isLegalPort;
const assertPort = internalNet.assertPort;
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 = new Array(arguments.length);
for (var i = 0; i < arguments.length; i++)
args[i] = arguments[i];
args = normalizeArgs(args);
debug('createConnection', args);
var s = new Socket(args[0]);
return Socket.prototype.connect.apply(s, args);
};
// Returns an array [options, cb], where cb can be null.
// It is the same as the argument of Socket.prototype.connect().
// This is used by Server.prototype.listen() and Socket.prototype.connect().
function normalizeArgs(args) {
var options = {};
if (args.length === 0) {
return [options];
} else 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 (args.length > 1 && typeof args[1] === 'string') {
options.host = args[1];
}
}
var cb = args[args.length - 1];
if (typeof cb !== 'function')
cb = null;
return [options, cb];
}
exports._normalizeArgs = normalizeArgs;
// called when creating new Socket, or when re-using a closed Socket
function initSocketHandle(self) {
self.destroyed = false;
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;
}
}
const BYTES_READ = Symbol('bytesRead');
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);
}
}
// Reserve properties
this.server = null;
this._server = null;
// Used after `.destroy()`
this[BYTES_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';
// TODO: defer error events consistently everywhere, not just the cb
this.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');
this.on('connection', arguments[0]);
listen(this, 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(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(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, '_connecting', {
get: function() {
return this.connecting;
}
});
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(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');
function fireErrorCallbacks(self) {
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(this);
return;
}
this.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;
// `bytesRead` should be accessible after `.destroy()`
this[BYTES_READ] = this._handle.bytesRead;
this._handle.close(() => {
debug('emit close');
this.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(this);
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.
// 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;
};
function protoGetter(name, callback) {
Object.defineProperty(Socket.prototype, name, {
configurable: false,
enumerable: true,
get: callback
});
}
protoGetter('bytesRead', function bytesRead() {
return this._handle ? this._handle.bytesRead : this[BYTES_READ];
});
protoGetter('remoteAddress', function remoteAddress() {
return this._getpeername().address;
});
protoGetter('remoteFamily', function remoteFamily() {
return this._getpeername().family;
});
protoGetter('remotePort', function remotePort() {
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;
};
protoGetter('localAddress', function localAddress() {
return this._getsockname().address;
});
protoGetter('localPort', function localPort() {
return this._getsockname().port;
});
Socket.prototype.write = function(chunk, encoding, cb) {
if (typeof chunk !== 'string' && !(chunk instanceof Buffer)) {
throw new TypeError(
'Invalid data, chunk must be a string or buffer, not ' + typeof chunk);
}
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];
chunks[i * 2] = entry.chunk;
chunks[i * 2 + 1] = entry.encoding;
}
err = this._handle.writev(req, chunks);
// Retain chunks
if (err === 0) req._chunks = chunks;
} else {
var enc;
if (data instanceof Buffer) {
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 'latin1':
case 'binary':
return handle.writeLatin1String(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, Buffer.from(data, encoding));
}
}
protoGetter('bytesWritten', function bytesWritten() {
var bytes = this._bytesDispatched;
const state = this._writableState;
const data = this._pendingData;
const encoding = this._pendingEncoding;
if (!state)
return undefined;
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 = errnoException(status, 'write', req.error);
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) {
const ex = exceptionWithHostPort(err, 'bind', localAddress, localPort);
self._destroy(ex);
return;
}
}
if (addressType === 6 || addressType === 4) {
const req = new TCPConnectWrap();
req.oncomplete = afterConnect;
req.address = address;
req.port = port;
req.localAddress = localAddress;
req.localPort = localPort;
if (addressType === 4)
err = self._handle.connect(req, address, port);
else
err = self._handle.connect6(req, address, port);
} else {
const 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;
}
const ex = exceptionWithHostPort(err, 'connect', address, port, details);
self._destroy(ex);
}
}
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 = new Array(arguments.length);
for (var i = 0; i < arguments.length; i++)
args[i] = arguments[i];
args = normalizeArgs(args);
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 pipe = !!options.path;
debug('pipe', pipe, options.path);
if (!this._handle) {
this._handle = pipe ? new Pipe() : new TCP();
initSocketHandle(this);
}
if (typeof cb === 'function') {
this.once('connect', cb);
}
this._unrefTimer();
this.connecting = true;
this.writable = true;
if (pipe) {
connect(this, options.path);
} else {
lookupAndConnect(this, options);
}
return this;
};
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" option must be a valid IP: ' +
localAddress);
if (localPort && typeof localPort !== 'number')
throw new TypeError('"localPort" option should be a number: ' + localPort);
if (typeof port !== 'undefined') {
if (typeof port !== 'number' && typeof port !== 'string')
throw new TypeError('"port" option should be a number or string: ' +
port);
if (!isLegalPort(port))
throw new RangeError('"port" option should be >= 0 and < 65536: ' + port);
}
port |= 0;
// If host is an IP, skip performing a lookup
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('"lookup" option should be a function');
var dnsopts = {
family: options.family,
hints: options.hints || 0
};
if (dnsopts.family !== 4 && dnsopts.family !== 6 && dnsopts.hints === 0) {
dnsopts.hints = dns.ADDRCONFIG;
}
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, host);
// 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;