telebit.js/test-machine.js

'use strict';

var sni = require('sni');
var machine = require('./machine.js');
var hello = require('fs').readFileSync('./sni.hello.bin');
var version = 1;
var header = 'IPv4,127.0.1.1,443,' + hello.byteLength;
var buf = Buffer.concat([
  Buffer.from([ 255 - version, header.length ])
, Buffer.from(header)
, hello
]);
var services = { 'ssh': 22, 'http': 4080, 'https': 8443 };
var clients = {};

machine.onMessage = function (opts) {
  var id = opts.family + ',' + opts.address + ',' + opts.port;
  var service = 'https';
  var port = services[service];
  var servername = sni(opts.data);

  console.log('');
  console.log('[onMessage]');
  if (!opts.data.equals(hello)) {
    throw new Error("'data' packet is not equal to original 'hello' packet");
  }
  console.log('all ', opts.data.byteLength, 'bytes are equal');
  console.log('src:', opts.family, opts.address + ':' + opts.port);
  console.log('dst:', 'IPv4 127.0.0.1:' + port);

  if (!clients[id]) {
    clients[id] = true;
    if (!servername) {
      throw new Error("no servername found for '" + id + "'");
    }
    console.log("servername: '" + servername + "'");
  }
};


// full message in one go
// 223 = 2 + 22 + 199
console.log('');
console.log('[WHOLE BUFFER]', 2, header.length, hello.length, buf.byteLength);
clients = {};
machine.fns.addChunk(buf);


// messages one byte at a time
console.log('');
console.log('[BYTE-BY-BYTE BUFFER]', 1);
clients = {};
buf.forEach(function (byte) {
  machine.fns.addChunk(Buffer.from([ byte ]));
});


// split messages in overlapping thirds
// 0-2      (2)
// 2-24     (22)
// 24-223   (199)
// 223-225  (2)
// 225-247  (22)
// 247-446  (199)
buf = Buffer.concat([ buf, buf ]);
console.log('');
console.log('[OVERLAPPING BUFFERS]', buf.length);
clients = {};
[ buf.slice(0, 7)                 // version + header
, buf.slice(7, 14)                // header
, buf.slice(14, 21)               // header
, buf.slice(21, 28)               // header + body
, buf.slice(28, 217)              // body
, buf.slice(217, 224)             // body + version
, buf.slice(224, 238)             // version + header
, buf.slice(238, buf.byteLength)  // header + body
].forEach(function (buf) {
  machine.fns.addChunk(Buffer.from(buf));
});