telebit.js/wsclient.js

221 lines
6.4 KiB
JavaScript

(function () {
'use strict';
var net = require('net');
var WebSocket = require('ws');
var jwt = require('jsonwebtoken');
var sni = require('sni');
// TODO ask oauth3.org where to connect
// TODO reconnect on disconnect
// Assumption: will not get next tcp packet unless previous packet succeeded
//var services = { 'ssh': 22, 'http': 80, 'https': 443 };
var services = { 'ssh': 22, 'http': 4080, 'https': 8443 };
var hostname = 'aj.daplie.me'; // 'pokemap.hellabit.com'
function addrToId(address) {
return address.family + ',' + address.address + ',' + address.port;
}
/*
function socketToAddr(socket) {
return { family: socket.remoteFamily, address: socket.remoteAddress, port: socket.remotePort };
}
function socketToId(socket) {
return addrToId(socketToAddr(socket));
}
*/
var token = jwt.sign({ name: hostname }, 'shhhhh');
/*
var request = require('request');
request.get('https://pokemap.hellabit.com:3000?access_token=' + token, { rejectUnauthorized: false }, function (err, resp) {
console.log('resp.body');
console.log(resp.body);
});
return;
//*/
var tunnelUrl = 'wss://pokemap.hellabit.com:3000/?access_token=' + token;
var wstunneler;
function run() {
var retry = true;
var localclients = {};
wstunneler = new WebSocket(tunnelUrl, { rejectUnauthorized: false });
function onOpen() {
console.log('[open] tunneler connected');
/*
setInterval(function () {
console.log('');
console.log('localclients.length:', Object.keys(localclients).length);
console.log('');
}, 5000);
*/
//wstunneler.send(token);
// BaaS / Backendless / noBackend / horizon.io
// user authentication
// a place to store data
// file management
// Synergy Teamwork Paradigm = Jabberwocky
var pack = require('tunnel-packer').pack;
var handlers = {
onmessage: function (opts) {
var cid = addrToId(opts);
console.log('[wsclient] onMessage:', cid, opts);
var service = opts.service;
var port = services[service];
var lclient;
var servername;
var str;
var m;
if (opts.data.byteLength < 20) {
if ('|__ERROR__|' === opts.data.toString('ascii')) {
handlers.onerror(opts);
return;
}
else if ('|__END__|' === opts.data.toString('ascii')) {
handlers.onend(opts);
return;
}
}
function endWithError() {
try {
wstunneler.send(pack(opts, null, 'error'), { binary: true });
} catch(e) {
// ignore
}
}
if (localclients[cid]) {
console.log("[=>] received data from '" + cid + "' =>", opts.data.byteLength);
localclients[cid].write(opts.data);
return;
}
else 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 {
endWithError();
return;
}
if (!servername) {
console.warn("|__ERROR__| no servername found for '" + cid + "'");
console.warn(opts.data.toString());
wstunneler.send(pack(opts, null, 'error'), { binary: true });
return;
}
console.log("servername: '" + servername + "'");
lclient = localclients[cid] = net.createConnection({ port: port, host: '127.0.0.1' }, function () {
console.log("[=>] first packet from tunneler to '" + cid + "' as '" + opts.service + "'", opts.data.byteLength);
lclient.write(opts.data);
});
lclient.on('data', function (chunk) {
console.log("[<=] local '" + opts.service + "' sent to '" + cid + "' <= ", chunk.byteLength, "bytes");
console.log(JSON.stringify(chunk.toString()));
wstunneler.send(pack(opts, chunk), { binary: true });
});
lclient.on('error', function (err) {
console.error("[error] local '" + opts.service + "' '" + cid + "'");
console.error(err);
delete localclients[cid];
try {
wstunneler.send(pack(opts, null, 'error'), { binary: true });
} catch(e) {
// ignore
}
});
lclient.on('end', function () {
console.log("[end] local '" + opts.service + "' '" + cid + "'");
delete localclients[cid];
try {
wstunneler.send(pack(opts, null, 'end'), { binary: true });
} catch(e) {
// ignore
}
});
}
, onend: function (opts) {
var cid = addrToId(opts);
console.log("[end] '" + cid + "'");
handlers._onend(cid, opts);
}
, onerror: function (opts) {
var cid = addrToId(opts);
console.log("[error] '" + cid + "'", opts.code || '', opts.message);
handlers._onend(cid);
}
, _onend: function (cid) {
if (localclients[cid]) {
localclients[cid].end();
}
delete localclients[cid];
}
};
var machine = require('tunnel-packer').create(handlers);
wstunneler.on('message', machine.fns.addChunk);
}
wstunneler.on('open', onOpen);
wstunneler.on('close', function () {
console.log('closing tunnel...');
process.removeListener('exit', onExit);
process.removeListener('SIGINT', onExit);
Object.keys(localclients).forEach(function (cid) {
try {
localclients[cid].end();
} catch(e) {
// ignore
}
delete localclients[cid];
});
if (retry) {
console.log('retry on close');
setTimeout(run, 5000);
}
});
wstunneler.on('error', function (err) {
console.error("[error] will retry on 'close'");
console.error(err);
});
function onExit() {
retry = false;
console.log('on exit...');
try {
wstunneler.close();
} catch(e) {
console.error(e);
// ignore
}
}
process.on('exit', onExit);
process.on('SIGINT', onExit);
}
run();
}());