Socket with proxy

Question

guys, I have a raw socket server on a local computer communicating with its client on the same machine. Unfortunately, I can not use Wireshark or Ethereal because they will only works from the local TCP point to the outside world. In my case, all is taken place locally and I want to capture those data between the local raw socket server and its client. I was told that there might be a possibility with using proxy class. Is this possible? If so, could you tell me how?
btw, there is a really cool software that does what I need:
http://www.sstinc.com/winsock.html
Unfortunately, this is only for windows :-), I need a universal solution where I can deploy my tools on any OS. Java is my answer.
Also, I can not split up the client and raw socket server onto separate machines either so I can use Wireshark. This is the way they're developed.
Oh another thing, I'd tried creating a java raw socket client which works but I can only attach to one socket port at a time at 1 TCP port. 1 TCP port is fine but I want to be able to sniff every socket ports, capturing every data packets going back and forward between the server and client. I don't know if proxy class works because I don't have a proxy anywhere installed.
Thanks in advance.

Answer 1

Something like this. Note I haven't even tried to compile it, it's a 2-minute hack. (You really shouldn't use this directly.)
class portlogger {
     public static void main(String[] args) throws Exception {
          int source = Integer.parseInt(args[0]); // client's target port
          int target = Integer.parseInt(args[1]);  // server's actual port
          ServerSocket ss = new ServerSocket(source);
          final Socket src = ss.listen();
          final Socket tgt = new Socket("127.0.0.1", target);
          (new Thread(){
               public void run(){
                    BufferedInputStream br = new BufferedInputStream(src.getInputStream());
                    byte[] buffer = new byte[1024];
                    int bytes;
                    while((bytes = br.read(buffer)) > 0){
                         // log the client's output here, pref. in a threaded way
                         tgt.getOutputStream().write(buffer, 0, bytes);
          }).start();
          (new Thread(){
               public void run(){
                    BufferedInputStream br = new BufferedInputStream(tgt.getInputStream());
                    byte[] buffer = new byte[1024];
                    int bytes;
                    while((bytes = br.read(buffer)) > 0){
                         // log the server's output here, pref. in a threaded way
                         src.getOutputStream().write(buffer, 0, bytes);
          }).start();
}