663 lines
22 KiB
JavaScript
663 lines
22 KiB
JavaScript
(function () {
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'use strict';
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var PromiseA;
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try {
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PromiseA = require('bluebird');
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} catch(e) {
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PromiseA = global.Promise;
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}
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var WebSocket = require('ws');
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var sni = require('sni');
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var Packer = require('proxy-packer');
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var os = require('os');
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function timeoutPromise(duration) {
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return new PromiseA(function (resolve) {
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setTimeout(resolve, duration);
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});
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}
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function _connect(state) {
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// jshint latedef:false
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var defaultHttpTimeout = (2 * 60);
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var activityTimeout = state.activityTimeout || (defaultHttpTimeout - 5) * 1000;
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var pongTimeout = state.pongTimeout || 10*1000;
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// Allow the tunnel client to be created with no token. This will prevent the connection from
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// being established initialy and allows the caller to use `.append` for the first token so
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// they can get a promise that will provide feedback about invalid tokens.
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var tokens = [];
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var auth;
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if(!state.sortingHat) {
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state.sortingHat = "./sorting-hat.js";
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}
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if (state.token) {
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if ('undefined' === state.token) {
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throw new Error("passed string 'undefined' as token");
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}
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tokens.push(state.token);
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}
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var wstunneler;
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var authenticated = false;
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var authsent = false;
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var initialConnect = true;
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var localclients = {};
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var pausedClients = [];
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var clientHandlers = {
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add: function (conn, cid, tun) {
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localclients[cid] = conn;
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console.info("[connect] new client '" + cid + "' for '" + tun.name + ":" + tun.serviceport + "' "
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+ "(" + clientHandlers.count() + " clients)");
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conn.tunnelCid = cid;
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conn.tunnelRead = tun.data.byteLength;
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conn.tunnelWritten = 0;
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conn.on('data', function onLocalData(chunk) {
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if (conn.tunnelClosing) {
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console.warn("[onLocalData] received data for '"+cid+"' over socket after connection was ended");
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return;
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}
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// This value is bytes written to the tunnel (ie read from the local connection)
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conn.tunnelWritten += chunk.byteLength;
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// If we have a lot of buffered data waiting to be sent over the websocket we want to slow
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// down the data we are getting to send over. We also want to pause all active connections
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// if any connections are paused to make things more fair so one connection doesn't get
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// stuff waiting for all other connections to finish because it tried writing near the border.
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var bufSize = wsHandlers.sendMessage(Packer.pack(tun, chunk));
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if (pausedClients.length || bufSize > 1024*1024) {
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// console.log('[onLocalData] paused connection', cid, 'to allow websocket to catch up');
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conn.pause();
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pausedClients.push(conn);
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}
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});
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var sentEnd = false;
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conn.on('end', function onLocalEnd() {
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console.info("[onLocalEnd] connection '" + cid + "' ended, will probably close soon");
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conn.tunnelClosing = true;
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if (!sentEnd) {
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wsHandlers.sendMessage(Packer.pack(tun, null, 'end'));
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sentEnd = true;
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}
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});
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conn.on('error', function onLocalError(err) {
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console.info("[onLocalError] connection '" + cid + "' errored:", err);
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if (!sentEnd) {
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wsHandlers.sendMessage(Packer.pack(tun, {message: err.message, code: err.code}, 'error'));
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sentEnd = true;
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}
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});
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conn.on('close', function onLocalClose(hadErr) {
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delete localclients[cid];
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console.log('[onLocalClose] closed "' + cid + '" read:'+conn.tunnelRead+', wrote:'+conn.tunnelWritten+' (' + clientHandlers.count() + ' clients)');
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if (!sentEnd) {
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wsHandlers.sendMessage(Packer.pack(tun, null, hadErr && 'error' || 'end'));
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sentEnd = true;
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}
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});
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}
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, write: function (cid, opts) {
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var conn = localclients[cid];
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if (!conn) {
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return false;
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}
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//console.log("[=>] received data from '" + cid + "' =>", opts.data.byteLength);
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if (conn.tunnelClosing) {
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console.warn("[onmessage] received data for '"+cid+"' over socket after connection was ended");
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return true;
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}
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conn.write(opts.data);
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// It might seem weird to increase the "read" value in a function named `write`, but this
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// is bytes read from the tunnel and written to the local connection.
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conn.tunnelRead += opts.data.byteLength;
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if (!conn.remotePaused && conn.bufferSize > 1024*1024) {
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wsHandlers.sendMessage(Packer.pack(opts, conn.tunnelRead, 'pause'));
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conn.remotePaused = true;
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conn.once('drain', function () {
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wsHandlers.sendMessage(Packer.pack(opts, conn.tunnelRead, 'resume'));
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conn.remotePaused = false;
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});
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}
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return true;
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}
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, closeSingle: function (cid) {
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if (!localclients[cid]) {
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return;
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}
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console.log('[closeSingle]', cid);
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PromiseA.resolve().then(function () {
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var conn = localclients[cid];
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conn.tunnelClosing = true;
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conn.end();
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// If no data is buffered for writing then we don't need to wait for it to drain.
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if (!conn.bufferSize) {
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return timeoutPromise(500);
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}
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// Otherwise we want the connection to be able to finish, but we also want to impose
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// a time limit for it to drain, since it shouldn't have more than 1MB buffered.
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return new PromiseA(function (resolve) {
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var timeoutId = setTimeout(resolve, 60*1000);
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conn.once('drain', function () {
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clearTimeout(timeoutId);
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setTimeout(resolve, 500);
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});
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});
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}).then(function () {
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if (localclients[cid]) {
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console.warn('[closeSingle]', cid, 'connection still present after calling `end`');
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localclients[cid].destroy();
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return timeoutPromise(500);
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}
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}).then(function () {
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if (localclients[cid]) {
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console.error('[closeSingle]', cid, 'connection still present after calling `destroy`');
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delete localclients[cid];
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}
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}).catch(function (err) {
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console.error('[closeSingle] failed to close connection', cid, err.toString());
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delete localclients[cid];
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});
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}
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, closeAll: function () {
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console.log('[closeAll]');
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Object.keys(localclients).forEach(function (cid) {
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clientHandlers.closeSingle(cid);
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});
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}
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, count: function () {
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return Object.keys(localclients).length;
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}
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};
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var pendingCommands = {};
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function sendCommand(name) {
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var id = Math.ceil(1e9 * Math.random());
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var cmd = [id, name].concat(Array.prototype.slice.call(arguments, 1));
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if (state.debug) { console.log('[DEBUG] command sending', cmd); }
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wsHandlers.sendMessage(Packer.pack(null, cmd, 'control'));
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setTimeout(function () {
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if (pendingCommands[id]) {
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console.warn('command', name, id, 'timed out');
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pendingCommands[id]({
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message: 'response not received in time'
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, code: 'E_TIMEOUT'
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});
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}
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}, pongTimeout);
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return new PromiseA(function (resolve, reject) {
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pendingCommands[id] = function (err, result) {
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delete pendingCommands[id];
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if (err) {
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reject(err);
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} else {
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resolve(result);
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}
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};
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});
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}
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function sendAllTokens() {
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if (auth) {
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authsent = true;
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sendCommand('auth', auth).catch(function (err) { console.error('1', err); });
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}
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tokens.forEach(function (jwtoken) {
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if (state.debug) { console.log('[DEBUG] send token'); }
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authsent = true;
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sendCommand('add_token', jwtoken)
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.catch(function (err) {
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console.error('failed re-adding token', jwtoken, 'after reconnect', err);
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// Not sure if we should do something like remove the token here. It worked
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// once or it shouldn't have stayed in the list, so it's less certain why
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// it would have failed here.
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});
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});
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}
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function noHandler(cmd) {
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console.warn("[telebit] state.handlers['" + cmd[1] + "'] not set");
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console.warn(cmd[2]);
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}
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var connCallback;
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var packerHandlers = {
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oncontrol: function (opts) {
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var cmd, err;
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try {
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cmd = JSON.parse(opts.data.toString());
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} catch (err) {}
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if (!Array.isArray(cmd) || typeof cmd[0] !== 'number') {
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console.warn('received bad command "' + opts.data.toString() + '"');
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return;
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}
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if (cmd[0] < 0) {
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var cb = pendingCommands[-cmd[0]];
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if (!cb) {
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console.warn('received response for unknown request:', cmd);
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} else {
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cb.apply(null, cmd.slice(1));
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}
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return;
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}
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if (cmd[0] === 0) {
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console.warn('received dis-associated error from server', cmd[1]);
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if (connCallback) {
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connCallback(cmd[1]);
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}
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return;
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}
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if (cmd[1] === 'hello') {
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if (state.debug) { console.log('[DEBUG] hello received'); }
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sendAllTokens();
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if (connCallback) {
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connCallback();
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}
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// TODO: handle the versions and commands provided by 'hello' - isn't super important
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// yet since there is only one version and set of commands.
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err = null;
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} else if (cmd[1] === 'grant') {
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authenticated = true;
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if (state.handlers[cmd[1]]) {
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state.handlers[cmd[1]](cmd[2]);
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} else {
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noHandler(cmd);
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}
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return;
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} else if (cmd[1] === 'access_token') {
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authenticated = true;
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if (state.handlers[cmd[1]]) {
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state.handlers[cmd[1]](cmd[2]);
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} else {
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noHandler(cmd);
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}
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return;
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} else {
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err = { message: 'unknown command "'+cmd[1]+'"', code: 'E_UNKNOWN_COMMAND' };
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}
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wsHandlers.sendMessage(Packer.pack(null, [-cmd[0], err], 'control'));
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}
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, onmessage: function (tun) {
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var cid = tun._id = Packer.addrToId(tun);
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var str;
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var m;
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if ('http' === tun.service) {
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str = tun.data.toString();
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m = str.match(/(?:^|[\r\n])Host: ([^\r\n]+)[\r\n]*/im);
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tun._name = tun._hostname = (m && m[1].toLowerCase() || '').split(':')[0];
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}
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else if ('https' === tun.service || 'tls' === tun.service) {
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tun._name = tun._servername = sni(tun.data);
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} else {
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tun._name = '';
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}
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if (clientHandlers.write(cid, tun)) { return; }
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wstunneler.pause();
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require(state.sortingHat).assign(state, tun, function (err, conn) {
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if (err) {
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err.message = err.message.replace(/:tun_id/, tun._id);
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packerHandlers._onConnectError(cid, tun, err);
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return;
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}
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clientHandlers.add(conn, cid, tun);
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if (tun.data) { conn.write(tun.data); }
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wstunneler.resume();
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});
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}
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, onpause: function (opts) {
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var cid = Packer.addrToId(opts);
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if (localclients[cid]) {
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console.log("[TunnelPause] pausing '"+cid+"', remote received", opts.data.toString(), 'of', localclients[cid].tunnelWritten, 'sent');
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localclients[cid].manualPause = true;
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localclients[cid].pause();
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} else {
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console.log('[TunnelPause] remote tried pausing finished connection', cid);
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// Often we have enough latency that we've finished sending before we're told to pause, so
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// don't worry about sending back errors, since we won't be sending data over anyway.
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// wsHandlers.sendMessage(Packer.pack(opts, {message: 'no matching connection', code: 'E_NO_CONN'}, 'error'));
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}
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}
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, onresume: function (opts) {
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var cid = Packer.addrToId(opts);
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if (localclients[cid]) {
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console.log("[TunnelResume] resuming '"+cid+"', remote received", opts.data.toString(), 'of', localclients[cid].tunnelWritten, 'sent');
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localclients[cid].manualPause = false;
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localclients[cid].resume();
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} else {
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console.log('[TunnelResume] remote tried resuming finished connection', cid);
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// wsHandlers.sendMessage(Packer.pack(opts, {message: 'no matching connection', code: 'E_NO_CONN'}, 'error'));
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}
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}
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, onend: function (opts) {
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var cid = Packer.addrToId(opts);
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//console.log("[end] '" + cid + "'");
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clientHandlers.closeSingle(cid);
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}
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, onerror: function (opts) {
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var cid = Packer.addrToId(opts);
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//console.log("[error] '" + cid + "'", opts.code || '', opts.message);
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clientHandlers.closeSingle(cid);
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}
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, _onConnectError: function (cid, opts, err) {
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console.info("[_onConnectError] opening '" + cid + "' failed because " + err.message);
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wsHandlers.sendMessage(Packer.pack(opts, null, 'error'));
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}
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};
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var lastActivity;
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var timeoutId;
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var wsHandlers = {
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refreshTimeout: function () {
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lastActivity = Date.now();
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}
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, checkTimeout: function () {
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if (!wstunneler) {
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console.warn('checkTimeout called when websocket already closed');
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return;
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}
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// Determine how long the connection has been "silent", ie no activity.
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var silent = Date.now() - lastActivity;
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// If we have had activity within the last activityTimeout then all we need to do is
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// call this function again at the soonest time when the connection could be timed out.
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if (silent < activityTimeout) {
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timeoutId = setTimeout(wsHandlers.checkTimeout, activityTimeout-silent);
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}
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// Otherwise we check to see if the pong has also timed out, and if not we send a ping
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// and call this function again when the pong will have timed out.
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else if (silent < activityTimeout + pongTimeout) {
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console.log('pinging tunnel server');
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try {
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wstunneler.ping();
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} catch (err) {
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console.warn('failed to ping tunnel server', err);
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}
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timeoutId = setTimeout(wsHandlers.checkTimeout, pongTimeout);
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}
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// Last case means the ping we sent before didn't get a response soon enough, so we
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// need to close the websocket connection.
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else {
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console.log('connection timed out');
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wstunneler.close(1000, 'connection timeout');
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}
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}
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, onOpen: function () {
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console.info("[open] connected to '" + (state.wss || state.relay) + "'");
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wsHandlers.refreshTimeout();
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timeoutId = setTimeout(wsHandlers.checkTimeout, activityTimeout);
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wstunneler._socket.on('drain', function () {
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// the websocket library has it's own buffer apart from node's socket buffer, but that one
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// is much more difficult to watch, so we watch for the lower level buffer to drain and
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// then check to see if the upper level buffer is still too full to write to. Note that
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// the websocket library buffer has something to do with compression, so I'm not requiring
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// that to be 0 before we start up again.
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if (wstunneler.bufferedAmount > 128*1024) {
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return;
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}
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pausedClients.forEach(function (conn) {
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if (!conn.manualPause) {
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// console.log('resuming connection', conn.tunnelCid, 'now the websocket has caught up');
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conn.resume();
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}
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});
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pausedClients.length = 0;
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});
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//Call either Open or Reconnect handlers.
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if(state.handlers.onOpen && initialConnect) {
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state.handlers.onOpen();
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} else if (state.handlers.onReconnect && !initialConnect) {
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state.handlers.onReconnect();
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}
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initialConnect = false;
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}
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, onClose: function () {
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clearTimeout(timeoutId);
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wstunneler = null;
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clientHandlers.closeAll();
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var error = new Error('websocket connection closed before response');
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error.code = 'E_CONN_CLOSED';
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Object.keys(pendingCommands).forEach(function (id) {
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pendingCommands[id](error);
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});
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if (connCallback) {
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connCallback(error);
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}
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if (!authenticated) {
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if(state.handlers.onError) {
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var err = new Error('Failed to connect on first attempt... check authentication');
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state.handlers.onError(err);
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}
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if(state.handlers.onClose) {
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state.handlers.onClose();
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}
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console.info('[close] failed on first attempt... check authentication.');
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timeoutId = null;
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}
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else if (tokens.length) {
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if(state.handlers.onDisconnect) {
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state.handlers.onDisconnect();
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}
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console.info('[retry] disconnected and waiting...');
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timeoutId = setTimeout(connect, 5000);
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} else {
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if(state.handlers.onClose) {
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state.handlers.onClose();
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}
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}
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}
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, onError: function (err) {
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if ('ENOTFOUND' === err.code) {
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// DNS issue, probably network is disconnected
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timeoutId = setTimeout(connect, 90 * 1000);
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return;
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}
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console.error("[tunnel error] " + err.message);
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console.error(err);
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if (connCallback) {
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connCallback(err);
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}
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}
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, sendMessage: function (msg) {
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if (wstunneler) {
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try {
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wstunneler.send(msg, {binary: true});
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return wstunneler.bufferedAmount;
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} catch (err) {
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// There is a chance that this occurred after the websocket was told to close
|
|
// and before it finished, in which case we don't need to log the error.
|
|
if (wstunneler.readyState !== wstunneler.CLOSING) {
|
|
console.warn('[sendMessage] error sending websocket message', err);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
};
|
|
|
|
function connect() {
|
|
if (wstunneler) {
|
|
console.warn('attempted to connect with connection already active');
|
|
return;
|
|
}
|
|
if (!tokens.length) {
|
|
if (state.config.email) {
|
|
auth = {
|
|
subject: state.config.email
|
|
, subject_scheme: 'mailto'
|
|
// TODO create domains list earlier
|
|
, scope: Object.keys(state.config.servernames || {}).join(',')
|
|
, otp: state.otp
|
|
, hostname: os.hostname()
|
|
// Used for User-Agent
|
|
, os_type: os.type()
|
|
, os_platform: os.platform()
|
|
, os_release: os.release()
|
|
, os_arch: os.arch()
|
|
};
|
|
}
|
|
}
|
|
timeoutId = null;
|
|
var machine = Packer.create(packerHandlers);
|
|
|
|
console.info("[connect] '" + (state.wss || state.relay) + "'");
|
|
var tunnelUrl = (state.wss || state.relay).replace(/\/$/, '') + '/'; // + auth;
|
|
wstunneler = new WebSocket(tunnelUrl, { rejectUnauthorized: !state.insecure });
|
|
wstunneler.on('open', wsHandlers.onOpen);
|
|
wstunneler.on('close', wsHandlers.onClose);
|
|
wstunneler.on('error', wsHandlers.onError);
|
|
|
|
// Our library will automatically handle sending the pong respose to ping requests.
|
|
wstunneler.on('ping', wsHandlers.refreshTimeout);
|
|
wstunneler.on('pong', wsHandlers.refreshTimeout);
|
|
wstunneler.on('message', function (data, flags) {
|
|
wsHandlers.refreshTimeout();
|
|
if (data.error || '{' === data[0]) {
|
|
console.log(data);
|
|
return;
|
|
}
|
|
machine.fns.addChunk(data, flags);
|
|
});
|
|
}
|
|
connect();
|
|
|
|
var connPromise;
|
|
return {
|
|
end: function(cb) {
|
|
tokens.length = 0;
|
|
if (timeoutId) {
|
|
clearTimeout(timeoutId);
|
|
timeoutId = null;
|
|
}
|
|
|
|
if (wstunneler) {
|
|
try {
|
|
wstunneler.close(cb);
|
|
} catch(e) {
|
|
console.error("[error] wstunneler.close()");
|
|
console.error(e);
|
|
}
|
|
}
|
|
}
|
|
, append: function (token) {
|
|
if (!token) {
|
|
throw new Error("attempted to append empty token");
|
|
}
|
|
if ('undefined' === token) {
|
|
throw new Error("attempted to append token as the string 'undefined'");
|
|
}
|
|
if (tokens.indexOf(token) >= 0) {
|
|
return PromiseA.resolve();
|
|
}
|
|
tokens.push(token);
|
|
var prom;
|
|
if (tokens.length === 1 && !wstunneler) {
|
|
// We just added the only token in the list, and the websocket connection isn't up
|
|
// so we need to restart the connection.
|
|
if (timeoutId) {
|
|
// Handle the case were the last token was removed and this token added between
|
|
// reconnect attempts to make sure we don't try openning multiple connections.
|
|
clearTimeout(timeoutId);
|
|
timeoutId = null;
|
|
}
|
|
|
|
// We want this case to behave as much like the other case as we can, but we don't have
|
|
// the same kind of reponses when we open brand new connections, so we have to rely on
|
|
// the 'hello' and the 'un-associated' error commands to determine if the token is good.
|
|
prom = connPromise = new PromiseA(function (resolve, reject) {
|
|
connCallback = function (err) {
|
|
connCallback = null;
|
|
connPromise = null;
|
|
if (err) {
|
|
reject(err);
|
|
} else {
|
|
resolve();
|
|
}
|
|
};
|
|
});
|
|
connect();
|
|
}
|
|
else if (connPromise) {
|
|
prom = connPromise.then(function () {
|
|
return sendCommand('add_token', token);
|
|
});
|
|
}
|
|
else {
|
|
prom = sendCommand('add_token', token);
|
|
}
|
|
|
|
prom.catch(function (err) {
|
|
console.error('adding token', token, 'failed:', err);
|
|
// Most probably an invalid token of some kind, so we don't really want to keep it.
|
|
tokens.splice(tokens.indexOf(token), 1);
|
|
});
|
|
|
|
return prom;
|
|
}
|
|
, clear: function (token) {
|
|
if (typeof token === 'undefined') {
|
|
token = '*';
|
|
}
|
|
|
|
if (token === '*') {
|
|
tokens.length = 0;
|
|
} else {
|
|
var index = tokens.indexOf(token);
|
|
if (index < 0) {
|
|
return PromiseA.resolve();
|
|
}
|
|
tokens.splice(index);
|
|
}
|
|
|
|
var prom = sendCommand('delete_token', token);
|
|
prom.catch(function (err) {
|
|
console.error('clearing token', token, 'failed:', err);
|
|
});
|
|
|
|
return prom;
|
|
}
|
|
};
|
|
}
|
|
|
|
module.exports.connect = _connect;
|
|
module.exports.createConnection = _connect;
|
|
|
|
}());
|