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Viewing file:     common.js (2.53 KB)      -rw-r--r--

/*
 * common.js
 *
 * (C) 2011, Charlie Robbins, Paolo Fragomeni, & the Contributors.
 */

var fs = require('fs'),
    tls = require('tls'),
    net = require('net'),
    crypto = require('crypto');

exports.createSocket = function (options) {
  options = options || {};
  options.type = options.type || 'tcp4';

  return options.type === 'tls'
    ? exports.createTlsSocket(options)
    : new net.Socket(options);
};

//
// ### function createTlsSocket (options)
// #### @options {Object} Tls options like in tls.js
// #### Should behave like tls.connect, except it just creates the socket like net.Socket
// #### Also has a function called 'connect' that will allow` it to connect to a remote host
// this is a rip of tls.js's connect
//
exports.createTlsSocket = function(options) {
  var self = this;

  //
  // Setup the TLS connection over the existing TCP connection:
  //
  // 1. Create a new instance of `net.Socket`.
  // 2. Create a new set of credentials with `options`.
  // 3. Create the TLS pair
  // 4. Pipe the TLS pair to the TCP socket
  //
  var socket = new net.Stream({ type: 'tcp4' });

  function setupTlsPipe () {
    var sslcontext = crypto.createCredentials(options),
        pair = tls.createSecurePair(sslcontext, false),
        cleartext = pipe(pair, socket);

    pair.on('secure', function() {
      var verifyError = pair.ssl.verifyError();

      if (verifyError) {
        cleartext.authorized = false;
        cleartext.authorizationError = verifyError;
      }
      else {
        cleartext.authorized = true;
      }
    });

    //
    // Setup the cleartext stream to have a `.connect()` method
    // which passes through to the underlying TCP socket.
    //
    socket.cleartext = cleartext;
    cleartext._controlReleased = true;
  }

  socket.on('connect', setupTlsPipe);

  return socket;
};

//
// helper function for createTlsSocket
//
function pipe(pair, socket) {
  pair.encrypted.pipe(socket);
  socket.pipe(pair.encrypted);

  pair.fd = socket.fd;
  var cleartext = pair.cleartext;
  cleartext.socket = socket;
  cleartext.encrypted = pair.encrypted;
  cleartext.authorized = false;

  function onerror(e) {
    if (cleartext._controlReleased) {
      cleartext.emit('error', e);
    }
  }

  function onclose() {
    socket.removeListener('error', onerror);
    socket.removeListener('close', onclose);
    socket.removeListener('timeout', ontimeout);
  }

  function ontimeout() {
    cleartext.emit('timeout');
  }

  socket.on('error', onerror);
  socket.on('close', onclose);
  socket.on('timeout', ontimeout);

  return cleartext;
}