telebit.js/wsclient.js

307 lines
9.3 KiB
JavaScript

(function () {
'use strict';
var WebSocket = require('ws');
var sni = require('sni');
var Packer = require('tunnel-packer');
function run(copts) {
var tunnelUrl = copts.stunneld.replace(/\/$/, '') + '/?access_token=' + copts.token;
var activityTimeout = copts.activityTimeout || 2*60*1000;
var pongTimeout = copts.pongTimeout || 10*1000;
var wstunneler;
var authenticated = false;
var localclients = {};
var clientHandlers = {
onClose: function (cid, opts, err) {
wsHandlers.sendMessage(Packer.pack(opts, null, err && 'error' || 'end'));
delete localclients[cid];
console.log('[local onClose] closed "' + cid + '" (' + clientHandlers.count() + ' clients)');
}
, onError: function(cid, opts, err) {
console.info("[local onError] closing '" + cid + "' because '" + err.message + "'");
clientHandlers.onClose(cid, opts, err);
}
, closeSingle: function (cid) {
if (!localclients[cid]) {
return;
}
console.log('[closeSingle]', cid);
try {
localclients[cid].end();
setTimeout(function () {
if (localclients[cid]) {
console.warn('[closeSingle]', cid, 'connection still present');
delete localclients[cid];
}
}, 500);
} catch (err) {
console.warn('[closeSingle] failed to close connection', cid, err);
delete localclients[cid];
}
}
, closeAll: function () {
console.log('[closeAll]');
Object.keys(localclients).forEach(function (cid) {
try {
localclients[cid].end();
} catch (err) {
console.warn('[closeAll] failed to close connection', cid, err);
}
});
setTimeout(function () {
Object.keys(localclients).forEach(function (cid) {
if (localclients[cid]) {
console.warn('[closeAll]', cid, 'connection still present');
delete localclients[cid];
}
});
}, 500);
}
, count: function () {
return Object.keys(localclients).length;
}
};
var packerHandlers = {
onmessage: function (opts) {
var net = copts.net || require('net');
var cid = Packer.addrToId(opts);
var service = opts.service.toLowerCase();
var portList = copts.services[service];
var servername;
var port;
var str;
var m;
authenticated = true;
if (localclients[cid]) {
//console.log("[=>] received data from '" + cid + "' =>", opts.data.byteLength);
localclients[cid].write(opts.data);
return;
}
if (!portList) {
packerHandlers._onConnectError(cid, opts, new Error("unsupported service '" + service + "'"));
return;
}
if ('http' === service) {
str = opts.data.toString();
m = str.match(/(?:^|[\r\n])Host: ([^\r\n]+)[\r\n]*/im);
servername = (m && m[1].toLowerCase() || '').split(':')[0];
}
else if ('https' === service) {
servername = sni(opts.data);
}
else {
servername = '*';
}
if (!servername) {
//console.warn(opts.data.toString());
packerHandlers._onConnectError(cid, opts, new Error("missing servername for '" + cid + "' " + opts.data.byteLength));
return;
}
port = portList[servername] || portList['*'];
var createOpts = {
port: port
, host: '127.0.0.1'
, servername: servername
, data: opts.data
, remoteFamily: opts.family
, remoteAddress: opts.address
, remotePort: opts.port
};
localclients[cid] = net.createConnection(createOpts, function () {
// this will happen before 'data' or 'readable' is triggered
// We use the data from the createOpts object so that the createConnection function has
// the oppurtunity of removing/changing it if it wants/needs to handle it differently.
if (createOpts.data) {
localclients[cid].write(createOpts.data);
}
});
console.info("[connect] new client '" + cid + "' for '" + servername + "' (" + clientHandlers.count() + " clients)");
localclients[cid].on('readable', function (size) {
var chunk;
if (!localclients[cid]) {
console.error("[error] localclients[cid]", cid);
return;
}
if (!localclients[cid].read) {
console.error("[error] localclients[cid].read", cid);
console.log(localclients[cid]);
return;
}
do {
chunk = localclients[cid].read(size);
if (chunk) {
wsHandlers.sendMessage(Packer.pack(opts, chunk));
}
} while (chunk);
});
localclients[cid].on('error', clientHandlers.onError.bind(null, cid, opts));
localclients[cid].on('end', clientHandlers.onClose.bind(null, cid, opts));
}
, onend: function (opts) {
var cid = Packer.addrToId(opts);
//console.log("[end] '" + cid + "'");
clientHandlers.closeSingle(cid);
}
, onerror: function (opts) {
var cid = Packer.addrToId(opts);
//console.log("[error] '" + cid + "'", opts.code || '', opts.message);
clientHandlers.closeSingle(cid);
}
, _onConnectError: function (cid, opts, err) {
console.info("[_onConnectError] opening '" + cid + "' failed because " + err.message);
wsHandlers.sendMessage(Packer.pack(opts, null, 'error'));
}
};
var retry = true;
var lastActivity;
var timeoutId;
var wsHandlers = {
refreshTimeout: function () {
lastActivity = Date.now();
}
, checkTimeout: function () {
if (!wstunneler) {
console.warn('checkTimeout called when websocket already closed');
return;
}
// Determine how long the connection has been "silent", ie no activity.
var silent = Date.now() - lastActivity;
// If we have had activity within the last activityTimeout then all we need to do is
// call this function again at the soonest time when the connection could be timed out.
if (silent < activityTimeout) {
timeoutId = setTimeout(wsHandlers.checkTimeout, activityTimeout-silent);
}
// Otherwise we check to see if the pong has also timed out, and if not we send a ping
// and call this function again when the pong will have timed out.
else if (silent < activityTimeout + pongTimeout) {
console.log('pinging tunnel server');
try {
wstunneler.ping();
} catch (err) {
console.warn('failed to ping tunnel server', err);
}
timeoutId = setTimeout(wsHandlers.checkTimeout, pongTimeout);
}
// Last case means the ping we sent before didn't get a response soon enough, so we
// need to close the websocket connection.
else {
console.log('connection timed out');
wstunneler.close(1000, 'connection timeout');
}
}
, onOpen: function () {
console.info("[open] connected to '" + copts.stunneld + "'");
wsHandlers.refreshTimeout();
timeoutId = setTimeout(wsHandlers.checkTimeout, activityTimeout);
}
, onClose: function () {
console.log('ON CLOSE');
clearTimeout(timeoutId);
wstunneler = null;
clientHandlers.closeAll();
if (!authenticated) {
console.info('[close] failed on first attempt... check authentication.');
timeoutId = null;
}
else if (retry) {
console.info('[retry] disconnected and waiting...');
timeoutId = setTimeout(connect, 5000);
}
}
, onError: function (err) {
console.error("[tunnel error] " + err.message);
console.error(err);
}
, sendMessage: function (msg) {
if (wstunneler) {
try {
wstunneler.send(msg, {binary: true});
} catch (err) {
// 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 (!retry) {
return;
}
timeoutId = null;
var machine = require('tunnel-packer').create(packerHandlers);
console.info("[connect] '" + copts.stunneld + "'");
wstunneler = new WebSocket(tunnelUrl, { rejectUnauthorized: !copts.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();
return {
end: function() {
retry = false;
if (timeoutId) {
clearTimeout(timeoutId);
timeoutId = null;
}
if (wstunneler) {
try {
wstunneler.close();
} catch(e) {
console.error("[error] wstunneler.close()");
console.error(e);
}
}
}
};
}
module.exports.connect = run;
module.exports.createConnection = run;
}());