307 lines
9.3 KiB
JavaScript
307 lines
9.3 KiB
JavaScript
(function () {
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'use strict';
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var WebSocket = require('ws');
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var sni = require('sni');
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var Packer = require('tunnel-packer');
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function run(copts) {
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var tunnelUrl = copts.stunneld.replace(/\/$/, '') + '/?access_token=' + copts.token;
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var activityTimeout = copts.activityTimeout || 2*60*1000;
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var pongTimeout = copts.pongTimeout || 10*1000;
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var wstunneler;
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var authenticated = false;
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var localclients = {};
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var clientHandlers = {
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onClose: function (cid, opts, err) {
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wsHandlers.sendMessage(Packer.pack(opts, null, err && 'error' || 'end'));
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delete localclients[cid];
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console.log('[local onClose] closed "' + cid + '" (' + clientHandlers.count() + ' clients)');
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}
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, onError: function(cid, opts, err) {
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console.info("[local onError] closing '" + cid + "' because '" + err.message + "'");
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clientHandlers.onClose(cid, opts, err);
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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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try {
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localclients[cid].end();
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setTimeout(function () {
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if (localclients[cid]) {
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console.warn('[closeSingle]', cid, 'connection still present');
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delete localclients[cid];
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}
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}, 500);
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} catch (err) {
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console.warn('[closeSingle] failed to close connection', cid, err);
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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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try {
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localclients[cid].end();
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} catch (err) {
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console.warn('[closeAll] failed to close connection', cid, err);
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}
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});
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setTimeout(function () {
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Object.keys(localclients).forEach(function (cid) {
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if (localclients[cid]) {
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console.warn('[closeAll]', cid, 'connection still present');
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delete localclients[cid];
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}
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});
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}, 500);
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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 packerHandlers = {
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onmessage: function (opts) {
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var net = copts.net || require('net');
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var cid = Packer.addrToId(opts);
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var service = opts.service.toLowerCase();
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var portList = copts.services[service];
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var servername;
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var port;
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var str;
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var m;
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authenticated = true;
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if (localclients[cid]) {
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//console.log("[=>] received data from '" + cid + "' =>", opts.data.byteLength);
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localclients[cid].write(opts.data);
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return;
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}
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if (!portList) {
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packerHandlers._onConnectError(cid, opts, new Error("unsupported service '" + service + "'"));
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return;
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}
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if ('http' === service) {
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str = opts.data.toString();
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m = str.match(/(?:^|[\r\n])Host: ([^\r\n]+)[\r\n]*/im);
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servername = (m && m[1].toLowerCase() || '').split(':')[0];
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}
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else if ('https' === service) {
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servername = sni(opts.data);
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}
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else {
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servername = '*';
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}
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if (!servername) {
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//console.warn(opts.data.toString());
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packerHandlers._onConnectError(cid, opts, new Error("missing servername for '" + cid + "' " + opts.data.byteLength));
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return;
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}
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port = portList[servername] || portList['*'];
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var createOpts = {
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port: port
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, host: '127.0.0.1'
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, servername: servername
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, data: opts.data
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, remoteFamily: opts.family
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, remoteAddress: opts.address
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, remotePort: opts.port
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};
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localclients[cid] = net.createConnection(createOpts, function () {
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// this will happen before 'data' or 'readable' is triggered
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// We use the data from the createOpts object so that the createConnection function has
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// the oppurtunity of removing/changing it if it wants/needs to handle it differently.
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if (createOpts.data) {
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localclients[cid].write(createOpts.data);
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}
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});
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console.info("[connect] new client '" + cid + "' for '" + servername + "' (" + clientHandlers.count() + " clients)");
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localclients[cid].on('readable', function (size) {
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var chunk;
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if (!localclients[cid]) {
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console.error("[error] localclients[cid]", cid);
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return;
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}
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if (!localclients[cid].read) {
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console.error("[error] localclients[cid].read", cid);
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console.log(localclients[cid]);
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return;
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}
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do {
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chunk = localclients[cid].read(size);
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if (chunk) {
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wsHandlers.sendMessage(Packer.pack(opts, chunk));
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}
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} while (chunk);
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});
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localclients[cid].on('error', clientHandlers.onError.bind(null, cid, opts));
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localclients[cid].on('end', clientHandlers.onClose.bind(null, cid, opts));
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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 retry = true;
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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 '" + copts.stunneld + "'");
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wsHandlers.refreshTimeout();
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timeoutId = setTimeout(wsHandlers.checkTimeout, activityTimeout);
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}
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, onClose: function () {
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console.log('ON CLOSE');
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clearTimeout(timeoutId);
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wstunneler = null;
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clientHandlers.closeAll();
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if (!authenticated) {
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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 (retry) {
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console.info('[retry] disconnected and waiting...');
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timeoutId = setTimeout(connect, 5000);
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}
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}
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, onError: function (err) {
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console.error("[tunnel error] " + err.message);
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console.error(err);
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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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} catch (err) {
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// There is a chance that this occurred after the websocket was told to close
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// and before it finished, in which case we don't need to log the error.
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if (wstunneler.readyState !== wstunneler.CLOSING) {
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console.warn('[sendMessage] error sending websocket message', err);
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}
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}
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}
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}
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};
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function connect() {
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if (!retry) {
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return;
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}
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timeoutId = null;
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var machine = require('tunnel-packer').create(packerHandlers);
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console.info("[connect] '" + copts.stunneld + "'");
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wstunneler = new WebSocket(tunnelUrl, { rejectUnauthorized: !copts.insecure });
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wstunneler.on('open', wsHandlers.onOpen);
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wstunneler.on('close', wsHandlers.onClose);
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wstunneler.on('error', wsHandlers.onError);
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// Our library will automatically handle sending the pong respose to ping requests.
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wstunneler.on('ping', wsHandlers.refreshTimeout);
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wstunneler.on('pong', wsHandlers.refreshTimeout);
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wstunneler.on('message', function (data, flags) {
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wsHandlers.refreshTimeout();
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if (data.error || '{' === data[0]) {
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console.log(data);
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return;
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}
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machine.fns.addChunk(data, flags);
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});
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}
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connect();
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return {
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end: function() {
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retry = false;
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if (timeoutId) {
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clearTimeout(timeoutId);
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timeoutId = null;
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}
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if (wstunneler) {
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try {
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wstunneler.close();
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} catch(e) {
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console.error("[error] wstunneler.close()");
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console.error(e);
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}
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}
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}
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};
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}
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module.exports.connect = run;
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module.exports.createConnection = run;
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}());
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