193 lines
5.6 KiB
JavaScript
Executable File
193 lines
5.6 KiB
JavaScript
Executable File
#!/usr/bin/env node
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// A WebSocket to TCP socket proxy
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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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// Known to work with node 0.8.9
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// Requires node modules: ws, optimist and policyfile
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// npm install ws optimist policyfile
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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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https = require('https'),
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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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Buffer = require('buffer').Buffer,
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WebSocketServer = require('ws').Server,
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webServer, wsServer,
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source_host, source_port, target_host, target_port,
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web_path = null;
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// Handle new WebSocket client
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new_client = function(client) {
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var clientAddr = client._socket.remoteAddress, log;
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console.log(client.upgradeReq.url);
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log = function (msg) {
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console.log(' ' + clientAddr + ': '+ msg);
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};
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log('WebSocket connection');
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log('Version ' + client.protocolVersion + ', subprotocol: ' + client.protocol);
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var target = net.createConnection(target_port,target_host, function() {
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log('connected to target');
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});
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target.on('data', function(data) {
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//log("sending message: " + data);
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try {
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if (client.protocol === 'base64') {
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client.send(new Buffer(data).toString('base64'));
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} else {
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client.send(data,{binary: true});
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}
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} catch(e) {
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log("Client closed, cleaning up target");
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target.end();
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}
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});
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target.on('end', function() {
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log('target disconnected');
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client.close();
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});
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target.on('error', function() {
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log('target connection error');
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target.end();
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client.close();
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});
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client.on('message', function(msg) {
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//log('got message: ' + msg);
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if (client.protocol === 'base64') {
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target.write(new Buffer(msg, 'base64'));
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} else {
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target.write(msg,'binary');
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}
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});
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client.on('close', function(code, reason) {
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log('WebSocket client disconnected: ' + code + ' [' + reason + ']');
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target.end();
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});
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client.on('error', function(a) {
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log('WebSocket client error: ' + a);
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target.end();
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});
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};
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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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// 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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if (! argv.web) {
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return http_error(response, 403, "403 Permission Denied");
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}
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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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fs.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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if (fs.statSync(filename).isDirectory()) {
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filename += '/index.html';
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}
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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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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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});
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};
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// Select 'binary' or 'base64' subprotocol, preferring 'binary'
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selectProtocol = function(protocols, callback) {
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if (protocols.indexOf('binary') >= 0) {
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callback(true, 'binary');
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} else if (protocols.indexOf('base64') >= 0) {
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callback(true, 'base64');
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} else {
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console.log("Client must support 'binary' or 'base64' protocol");
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callback(false);
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}
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}
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// parse source and target arguments into parts
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try {
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source_arg = argv._[0].toString();
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target_arg = argv._[1].toString();
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var idx;
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idx = source_arg.indexOf(":");
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if (idx >= 0) {
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source_host = source_arg.slice(0, idx);
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source_port = parseInt(source_arg.slice(idx+1), 10);
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} else {
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source_host = "";
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source_port = parseInt(source_arg, 10);
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}
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idx = target_arg.indexOf(":");
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if (idx < 0) {
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throw("target must be host:port");
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}
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target_host = target_arg.slice(0, idx);
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target_port = parseInt(target_arg.slice(idx+1), 10);
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if (isNaN(source_port) || isNaN(target_port)) {
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throw("illegal port");
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}
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} catch(e) {
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console.error("websockify.js [--web web_dir] [--cert cert.pem [--key key.pem]] [source_addr:]source_port target_addr:target_port");
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process.exit(2);
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}
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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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if (argv.cert) {
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argv.key = argv.key || argv.cert;
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var cert = fs.readFileSync(argv.cert),
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key = fs.readFileSync(argv.key);
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console.log(" - Running in encrypted HTTPS (wss://) mode using: " + argv.cert + ", " + argv.key);
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webServer = https.createServer({cert: cert, key: key}, http_request);
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} else {
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console.log(" - Running in unencrypted HTTP (ws://) mode");
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webServer = http.createServer(http_request);
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}
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webServer.listen(source_port, function() {
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wsServer = new WebSocketServer({server: webServer,
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handleProtocols: selectProtocol});
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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, webServer);
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