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Escher is a collection of libraries for X Window System written purely in Java.

The newest version!

package gnu.app;

import gnu.x11.Data;
import java.net.Socket;
import java.io.InputStream;
import java.io.OutputStream;


/**
 * A network middle-layer sniffer.
 *
 * Useful for debugging x11 protocol. Highly un-optimizied.
 * 
 * @see 
 * help output
 */
public class Sniff extends Application {
  public Sniff (String [] args) throws java.io.IOException, 
    java.net.UnknownHostException, InterruptedException {

    super (args);

    int listen_port = option.intt ("listen-port",
      "port number to listen to", 6001);
    int talk_port = option.intt ("talk-port",
      "port number to talk to", 6000);

    about ("0.1", "network middle-layer sniffer",
      "Stephen Tse ",
      "http://escher.sourceforge.net/");

    if (help_option) return;    

    Socket listen_socket = new java.net.ServerSocket (
      listen_port).accept ();
    InputStream listen_is = listen_socket.getInputStream ();
    OutputStream listen_os = listen_socket.getOutputStream ();

    Socket talk_socket = new Socket ("127.0.0.1", talk_port);
    InputStream talk_is = talk_socket.getInputStream ();
    OutputStream talk_os = talk_socket.getOutputStream ();
    
    while (true) {
      boolean something = false;

      while (listen_is.available () > 0) {
        something = true;
        int data = listen_is.read ();
        talk_os.write (data);
        System.out.println ("> " + Data.byte_to_string (data));
      }

      while (talk_is.available () > 0) {
        something = true;
        int data = talk_is.read ();
        listen_os.write (data);
        System.out.println ("< " + Data.byte_to_string (data));
      }

      if (!something) gnu.util.Misc.sleep (100);
    }
  }

  
  public static void main (String [] args) throws Exception {
    new Sniff (args);
  }
}