/**
   * Returns the result of applying XOR on the specified attribute's address. The method may be used
   * for both encoding and decoding XorMappedAddresses.
   *
   * @param address the address on which XOR should be applied
   * @param transactionID the transaction id to use for the XOR
   * @return the XOR-ed address.
   */
  public static TransportAddress applyXor(TransportAddress address, byte[] transactionID) {
    byte[] addressBytes = address.getAddressBytes();
    char port = (char) address.getPort();

    char portModifier =
        (char) ((transactionID[0] << 8 & 0x0000FF00) | (transactionID[1] & 0x000000FF));

    port ^= portModifier;

    for (int i = 0; i < addressBytes.length; i++) addressBytes[i] ^= transactionID[i];

    TransportAddress xoredAdd;
    try {
      xoredAdd = new TransportAddress(addressBytes, port, Transport.UDP);
    } catch (UnknownHostException e) {
      // shouldn't happen so just throw an illegal arg
      throw new IllegalArgumentException(e);
    }

    return xoredAdd;
  }
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  /** The listening thread's run method. */
  @Override
  public void run() {
    DatagramPacket packet = null;

    while (this.running) {
      try {
        IceSocketWrapper localSock;

        synchronized (sockLock) {
          if (!running) return;

          localSock = this.sock;
        }

        /*
         * Make sure localSock's receiveBufferSize is taken into
         * account including after it gets changed.
         */
        int receiveBufferSize = 1500;
        /*
        if(localSock.getTCPSocket() != null)
        {
            receiveBufferSize = localSock.getTCPSocket().
                getReceiveBufferSize();
        }
        else if(localSock.getUDPSocket() != null)
        {
            receiveBufferSize = localSock.getUDPSocket().
                getReceiveBufferSize();
        }
        */

        if (packet == null) {
          packet = new DatagramPacket(new byte[receiveBufferSize], receiveBufferSize);
        } else {
          byte[] packetData = packet.getData();

          if ((packetData == null) || (packetData.length < receiveBufferSize)) {
            packet.setData(new byte[receiveBufferSize], 0, receiveBufferSize);
          } else {
            /*
             * XXX Tell the packet it is large enough because the
             * socket will not look at the length of the data array
             * property and will just respect the length property.
             */
            packet.setLength(receiveBufferSize);
          }
        }

        localSock.receive(packet);

        // get lost if we are no longer running.
        if (!running) return;

        logger.finest("received datagram");

        RawMessage rawMessage =
            new RawMessage(
                packet.getData(),
                packet.getLength(),
                new TransportAddress(
                    packet.getAddress(), packet.getPort(), listenAddress.getTransport()),
                listenAddress);

        messageQueue.add(rawMessage);
      } catch (SocketException ex) {
        if (running) {
          logger.log(
              Level.WARNING, "Connector died: " + listenAddress + " -> " + remoteAddress, ex);

          stop();
          // Something wrong has happened
          errorHandler.handleFatalError(
              this, "A socket exception was thrown" + " while trying to receive a message.", ex);
        } else {
          // The exception was most probably caused by calling
          // this.stop().
        }
      } catch (ClosedChannelException cce) {
        logger.log(Level.WARNING, "A net access point has gone useless:", cce);

        stop();
        errorHandler.handleFatalError(
            this, "ClosedChannelException occurred while listening" + " for messages!", cce);
      } catch (IOException ex) {
        logger.log(Level.WARNING, "A net access point has gone useless:", ex);

        errorHandler.handleError(ex.getMessage(), ex);
        // do not stop the thread;
      } catch (Throwable ex) {
        logger.log(Level.WARNING, "A net access point has gone useless:", ex);

        stop();
        errorHandler.handleFatalError(
            this, "Unknown error occurred while listening for messages!", ex);
      }
    }
  }