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AJ ONeal
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83
client.js
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83
client.js
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'use strict';
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var net = require('net');
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var jwt = require('jsonwebtoken');
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var sni = require('sni');
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// TODO ask oauth3.org where to connect
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// TODO reconnect on disconnect
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function pack(address, data) {
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var version = 1;
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var header = /*servername + ',' +*/address.family + ',' + address.address + ',' + address.port + ',' + data.byteLength;
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var meta = [ 255 - version, header.length ];
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var buf = Buffer.alloc(meta.length + header.length + data.byteLength);
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buf.write(meta[0], 0);
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buf.write(meta[1], 1);
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buf.write(header, 2);
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buf.write(data, 2 + header.length);
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return buf;
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}
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// Assumption: will not get next tcp packet unless previous packet succeeded
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//var services = { 'ssh': 22, 'http': 80, 'https': 443 };
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var services = { 'ssh': 22, 'http': 4080, 'https': 8443 };
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var tunneler = net.connect({ port: 5443 , host: 'pokemap.hellabit.com' }, function () {
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var token = jwt.sign({ name: 'pokemap.hellabit.com' }, 'shhhhh');
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var clients = {};
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tunneler.write(token);
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// BaaS / Backendless / noBackend / horizon.io
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// user authentication
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// a place to store data
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// file management
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// Synergy Teamwork Paradigm = Jabberwocky
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var machine = require('./machine.js');
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machine.onMessage = function (opts) {
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var id = opts.family + ',' + opts.address + ',' + opts.port;
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var service = 'https';
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var port = services[service];
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var client;
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if (clients[id]) {
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clients[id].write(opts.data);
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return;
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}
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var servername = sni(opts.data);
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if (!servername) {
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console.warn("no servername found for '" + id + "'");
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tunneler.write(pack(opts, '|__ERROR__|'));
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return;
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}
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console.log("servername: '" + servername + "'");
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clients = clients[id] = net.createConnect({ port: port, host: servername }, function () {
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client.on('data', function (chunk) {
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console.error('client Data');
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tunneler.write(pack(opts, chunk));
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});
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client.on('error', function (err) {
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console.error('client Error');
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console.error(err);
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tunneler.write(pack(opts, '|__ERROR__|'));
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});
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client.on('end', function () {
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console.error('client End');
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tunneler.write(pack(opts, '|__END__|'));
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});
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client.write(opts.data);
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});
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};
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tunneler.on('data', machine.fns.addChunk);
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tunneler.on('end', function () {
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console.log('end');
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});
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});
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138
machine.js
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138
machine.js
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'use strict';
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var machine = {};
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machine._version = 1;
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machine.state = 0;
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machine.states = { 0: 'version', 1: 'headerLength', 2: 'header', 3: 'data'/*, 4: 'error'*/ };
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machine.states_length = Object.keys(machine.states).length;
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machine.chunkIndex = 0;
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machine.fns = {};
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function debug(chunk, i, len) {
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i = i || 0;
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len = len || chunk.length - i;
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console.log(chunk.slice(i, len)[0]);
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console.log(chunk);
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console.log('state:', machine.states[machine.state]);
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console.log('statei:', machine.state);
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console.log('index:', machine.chunkIndex);
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}
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machine.fns.version = function (chunk) {
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if ((255 - machine._version) !== chunk[machine.chunkIndex]) {
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console.error("not v" + machine._version + " (or data is corrupt)");
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// no idea how to fix this yet
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}
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machine.chunkIndex += 1;
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};
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machine.headerLen = 0;
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machine.fns.headerLength = function (chunk) {
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machine.headerLen = chunk[machine.chunkIndex];
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machine.chunkIndex += 1;
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};
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machine.buf = null;
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machine.bufIndex = 0;
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//var buf = Buffer.alloc(4096);
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machine.fns.header = function (chunk) {
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var curSize = machine.bufIndex + (chunk.length - machine.chunkIndex);
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var partLen = 0;
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var str = '';
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if (curSize < machine.headerLen) {
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// I still don't have the whole header,
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// so just create a large enough buffer,
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// write these bits, and wait for the next chunk.
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if (!machine.buf) {
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machine.buf = Buffer.alloc(machine.headerLen);
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}
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partLen = machine.headerLen - machine.bufIndex;
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machine.buf.write(chunk.slice(machine.chunkIndex, machine.chunkIndex + partLen), machine.bufIndex);
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machine.chunkIndex += partLen; // this MUST be chunk.length
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machine.bufIndex += partLen;
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}
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else {
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// it's now ready to discover the whole header
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if (machine.buf) {
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str += machine.buf.slice(0, machine.bufIndex).toString();
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}
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partLen = machine.headerLen - str.length;
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str += chunk.slice(machine.chunkIndex, machine.chunkIndex + partLen).toString();
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machine.chunkIndex += partLen;
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// TODO maybe just use maxlen of buffer
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machine.buf = null; // back to null
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machine.bufIndex = 0; // back to 0
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machine._headers = str.split(/,/g);
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console.log(partLen);
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console.log('');
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console.log(chunk.toString());
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console.log('');
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console.log(str);
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console.log(machine._headers);
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machine.family = machine._headers[0];
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machine.address = machine._headers[1];
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machine.port = machine._headers[2];
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machine.bodyLen = machine._headers[3];
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}
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};
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machine.fns.data = function (chunk) {
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var curSize = machine.bufIndex + (chunk.length - machine.chunkIndex);
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var partLen = 0;
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var buf;
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if (curSize < machine.bodyLen) {
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// I still don't have the whole header,
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// so just create a large enough buffer,
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// write these bits, and wait for the next chunk.
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if (!machine.buf) {
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machine.buf = Buffer.alloc(machine.bodyLen);
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}
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partLen = machine.bodyLen - machine.bufIndex;
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machine.buf.write(chunk.slice(machine.chunkIndex, machine.chunkIndex + partLen), machine.bufIndex);
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//machine.chunkIndex += partLen; // this MUST be chunk.length
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machine.bufIndex += partLen;
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return;
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}
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// it's now ready to discover the whole header
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if (!machine.buf) {
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buf = chunk;
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machine.chunkIndex = chunk.length;
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}
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else {
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partLen = machine.bodyLen - machine.bufIndex;
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machine.buf.write(chunk.slice(machine.chunkIndex, machine.chunkIndex + partLen), machine.bufIndex);
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machine.chunkIndex += partLen;
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}
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machine.onMessage({
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family: machine.family
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, address: machine.address
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, port: machine.port
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, data: buf
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});
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// TODO maybe just use maxlen of buffer
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machine.buf = null; // back to null
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machine.bufIndex = 0; // back to 0
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};
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machine.fns.addChunk = function (chunk) {
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machine.chunkIndex = 0;
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while (machine.chunkIndex < chunk.length) {
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console.log(machine.state);
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machine.fns[machine.states[machine.state]](chunk);
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machine.state += 1;
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machine.state %= machine.states_length;
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}
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};
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module.exports = machine;
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process.on('uncaughtException', function () {
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debug(Buffer.from('0'));
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});
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27
package.json
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27
package.json
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{
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"name": "tunnel-client",
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"version": "1.0.0",
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"description": "A naive tunnel client",
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"main": "client.js",
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"scripts": {
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"test": "echo \"Error: no test specified\" && exit 1"
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},
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"repository": {
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"type": "git",
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"url": "git+ssh://git@github.com/Daplie/node-tunnel-client.git"
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},
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"keywords": [
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"tcp",
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"tunnel"
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],
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"author": "AJ ONeal <coolaj86@gmail.com> (https://coolaj86.com/)",
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"license": "(MIT OR Apache-2.0)",
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"bugs": {
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"url": "https://github.com/Daplie/node-tunnel-client/issues"
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},
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"homepage": "https://github.com/Daplie/node-tunnel-client#readme",
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"dependencies": {
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"jsonwebtoken": "^7.1.9",
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"sni": "^1.0.0"
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}
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}
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