Node impl to use einaros/ws and support HyBi.
Also adds web serving functionality and Flash policy service.
This commit is contained in:
Joel Martin
parent
9decfe1c95
commit
7ea468b5d7
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@ -1,227 +1,102 @@
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// A WebSocket to TCP socket proxy
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// Copyright 2010 Joel Martin
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// Copyright 2012 Joel Martin
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// Licensed under LGPL version 3 (see docs/LICENSE.LGPL-3)
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var net = require('net'),
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sys = require('sys'),
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crypto = require('crypto'),
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source_arg, source_host, source_port,
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target_arg, target_host, target_port;
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// Known to work with node 0.6
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// Requires node modules: ws, base64, optimist and policyfile
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// npm install ws base64 optimist policyfile
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// md5 calculation borrowed from Socket.IO (MIT license)
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function gen_md5(headers, k3) {
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var k1 = headers['sec-websocket-key1'],
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k2 = headers['sec-websocket-key2'],
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md5 = crypto.createHash('md5');
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var argv = require('optimist').argv,
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net = require('net'),
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http = require('http'),
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url = require('url'),
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path = require('path'),
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fs = require('fs'),
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policyfile = require('policyfile'),
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[k1, k2].forEach(function(k){
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var n = parseInt(k.replace(/[^\d]/g, '')),
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spaces = k.replace(/[^ ]/g, '').length;
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base64 = require('base64/build/Release/base64'),
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Buffer = require('buffer').Buffer,
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WebSocketServer = require('ws').Server,
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if (spaces === 0 || n % spaces !== 0){
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return false;
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}
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httpServer, wsServer,
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source_host, source_port, target_host, target_port,
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web_path = null;
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n /= spaces;
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md5.update(String.fromCharCode(
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n >> 24 & 0xFF,
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n >> 16 & 0xFF,
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n >> 8 & 0xFF,
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n & 0xFF));
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// Handle new WebSocket client
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new_client = function(client) {
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console.log('WebSocket client connected');
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//console.log('protocol: ' + client.protocol);
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var target = net.createConnection(target_port,target_host);
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target.on('begin', function() {
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console.log('connected to target');
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});
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target.on('data', function(data) {
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client.send(base64.encode(new Buffer(data)));
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});
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target.on('end', function() {
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console.log('target disconnected');
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});
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md5.update(k3.toString('binary'));
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client.on('message', function(msg) {
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//console.log('got some message');
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target.write(base64.decode(msg),'binary');
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});
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client.on('close', function(code, reason) {
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console.log('WebSocket client disconnected: ' + code + ' [' + reason + ']');
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});
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client.on('error', function(a) {
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console.log('WebSocket client error: ' + a);
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});
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};
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return md5.digest('binary');
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// Send an HTTP error response
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http_error = function (response, code, msg) {
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response.writeHead(code, {"Content-Type": "text/plain"});
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response.write(msg + "\n");
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response.end();
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return;
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}
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function encode(buf) {
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return String.fromCharCode(0) +
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buf.toString('base64', 0) +
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String.fromCharCode(255);
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}
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// Process an HTTP static file request
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http_request = function (request, response) {
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// console.log("pathname: " + url.parse(req.url).pathname);
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// res.writeHead(200, {'Content-Type': 'text/plain'});
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// res.end('okay');
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function decode(data) {
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var i, len = 0, strs, retstrs = [],
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buf = new Buffer(data.length),
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str = data.toString('binary', 1, data.length-1);
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if (str.indexOf('\xff') > -1) {
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// We've gotten multiple frames at once
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strs = str.split('\xff\x00')
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for (i = 0; i < strs.length; i++) {
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len = buf.write(strs[i], 0, 'base64');
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retstrs.push(buf.toString('binary', 0, len));
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}
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return retstrs.join("");
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} else {
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len = buf.write(str, 0, 'base64');
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return buf.toString('binary', 0, len);
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}
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}
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var server = net.createServer(function (client) {
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var handshake = "", headers = {}, header,
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version, path, k1, k2, k3, target = null;
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function cleanup() {
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client.end();
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if (target) {
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target.end();
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target = null;
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}
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if (! argv.web) {
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return http_error(response, 403, "403 Permission Denied");
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}
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function do_handshake(data) {
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var i, idx, dlen = data.length, lines, location, rheaders,
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sec_hdr;
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//sys.log("received handshake data: " + data);
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handshake += data.toString('utf8');
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if ((data[dlen-12] != 13) ||
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(data[dlen-11] != 10) ||
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(data[dlen-10] != 13) ||
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(data[dlen-9] != 10)) {
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//sys.log("Got partial handshake");
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return;
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}
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//sys.log("Got whole handshake");
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if (handshake.indexOf('GET ') != 0) {
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sys.error("Got invalid handshake");
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client.end();
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return;
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var uri = url.parse(request.url).pathname
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, filename = path.join(argv.web, uri);
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path.exists(filename, function(exists) {
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if(!exists) {
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return http_error(response, 404, "404 Not Found");
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}
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lines = handshake.split('\r\n');
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path = lines[0].split(' ')[1];
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//sys.log("path: " + path);
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if (fs.statSync(filename).isDirectory()) {
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filename += '/index.html';
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}
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k3 = data.slice(dlen-8, dlen);
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for (i = 1; i < lines.length; i++) {
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//sys.log("lines[i]: " + lines[i]);
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if (lines[i].length == 0) { break; }
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idx = lines[i].indexOf(': ');
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if (idx < 0) {
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sys.error("Got invalid handshake header");
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client.end();
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return;
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fs.readFile(filename, "binary", function(err, file) {
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if(err) {
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return http_error(response, 500, err);
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}
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header = lines[i].slice(0, idx).toLowerCase();
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headers[header] = lines[i].slice(idx+2);
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}
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//console.dir(headers);
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//sys.log("k3: " + k3 + ", k3.length: " + k3.length);
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if (headers.upgrade !== 'WebSocket') {
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sys.error("Upgrade header is not 'WebSocket'");
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client.end();
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return;
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}
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location = (headers.origin.substr(0, 5) == 'https' ? 'wss' : 'ws')
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+ '://' + headers.host + path;
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//sys.log("location: " + location);
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if ('sec-websocket-key1' in headers) {
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version = 76;
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sec_hdr = "Sec-";
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} else {
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version = 75;
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sec_hdr = "";
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}
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sys.log("using protocol version " + version);
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rheaders = [
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'HTTP/1.1 101 WebSocket Protocol Handshake',
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'Upgrade: WebSocket',
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'Connection: Upgrade',
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sec_hdr + 'WebSocket-Origin: ' + headers.origin,
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sec_hdr + 'WebSocket-Location: ' + location
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];
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if ('sec-websocket-protocol' in headers) {
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rheaders.push('Sec-WebSocket-Protocol: ' + headers['sec-websocket-protocol']);
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}
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rheaders.push('');
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if (version === 76) {
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rheaders.push(gen_md5(headers, k3));
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}
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// Switch listener to normal data path
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client.on('data', client_data);
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//client.setEncoding('utf8');
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client.removeListener('data', do_handshake);
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// Do not delay writes
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client.setNoDelay(true);
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// Send the handshake response
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try {
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//sys.log("response: " + rheaders.join('\r\n'));
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client.write(rheaders.join('\r\n'), 'binary');
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} catch(e) {
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sys.error("Failed to send handshake response");
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client.end();
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return;
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}
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// Create a connection to the target
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target = net.createConnection(target_port, target_host);
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target.on('data', target_data);
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target.on('end', function () {
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sys.log("received target end");
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cleanup();
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response.writeHead(200);
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response.write(file, "binary");
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response.end();
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});
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target.on('error', function (exc) {
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sys.log("received target error: " + exc);
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cleanup();
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});
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}
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function client_data(data) {
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var ret;
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//sys.log("received client data: " + data);
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//sys.log(" decoded: " + decode(data));
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try {
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ret = target.write(decode(data), 'binary');
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if (! ret) {
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sys.log("target write returned false");
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}
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} catch(e) {
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sys.log("fatal error writing to target");
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cleanup();
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}
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}
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function target_data(data) {
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//sys.log("received target data: " + data);
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//sys.log(" encoded: " + encode(data));
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try {
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client.write(encode(data), 'binary');
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} catch(e) {
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sys.log("fatal error writing to client");
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cleanup();
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}
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}
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client.on('connect', function () {
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sys.log("Got client connection");
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});
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client.on('data', do_handshake);
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client.on('end', function () {
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sys.log("recieved client end");
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cleanup();
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});
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client.on('error', function (exc) {
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sys.log("recieved client error: " + exc);
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cleanup();
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});
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});
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};
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// parse source and target into parts
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source_arg = process.argv[2];
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target_arg = process.argv[3];
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// parse source and target arguments into parts
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source_arg = argv._[0].toString();
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target_arg = argv._[1].toString();
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try {
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var idx;
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idx = source_arg.indexOf(":");
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@ -248,6 +123,18 @@ try {
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process.exit(2);
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}
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sys.log("source: " + source_host + ":" + source_port);
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sys.log("target: " + target_host + ":" + target_port);
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server.listen(source_port, source_host);
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console.log("WebSocket settings: ");
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console.log(" - proxying from " + source_host + ":" + source_port +
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" to " + target_host + ":" + target_port);
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if (argv.web) {
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console.log(" - Web server active. Serving: " + argv.web);
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}
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httpServer = http.createServer(http_request);
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httpServer.listen(source_port, function() {
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wsServer = new WebSocketServer({server: httpServer});
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wsServer.on('connection', new_client);
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});
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// Attach Flash policyfile answer service
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policyfile.createServer().listen(-1, httpServer);
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