[GNUnet-developers] #1211

[Wolfgang Brehm]

I wrote a simple threaded portscanner in java.
I hope it will be usefull. It is my first projekt, sadly my C/C++ is too bad 
to contribute right now.
It shoul't be difficult for me, to integrate the wished HELLO, I will have to 
read the documentation If this is wished


/**
 * Scanner
 * @author (wolfgang brehm) 
 * @version (10.4.2009)
 */

import java.util.ArrayList;

public class Scanner
{
    String host;
    int lowerport;
    int upperport;
    static int j=0;
    static ArrayList ports = new ArrayList(16);
    public Scanner(String host, int lowerport, int upperport)
    {
        this.host=host;
        this.lowerport=lowerport;
        this.upperport=upperport;
    }
        
    /**
     * Scanning method: threaded
     * 
     * @param String host       The host, which ports will be scanned
     * @param int lowerport     the lowerport
     * @param int upperport     the upperport
     * @return ports[] ports    The ports, which responded
     */
    
    public Object[] main()
    {
        for (int i=lowerport; i<=upperport; i++) {
            scan current = new scan(host, i);
            Thread th = new Thread(current);
            th.start();
            try{
                th.sleep(1);
            }catch (InterruptedException e){}
        }
        return ports.toArray();
    }
}

-----------------------------------------------------------------------------


/**
 * 
 * Thread scan, that is actually scanning.
 * @author (wolfgang brehm) 
 * @version (10.4.2009)
 */

import java.io.IOException;
import java.net.Socket;
import java.net.UnknownHostException;

public class scan implements Runnable
{
    int port;
    String host;
    public scan(String host, int port)
    {
        this.host=host;
        this.port=port;
    }

    
    /**
     * THE run() method a Runnable must implement
     *  
     */
    public void run()
    {
        try {
            Socket target = new Socket(host, port);
            Scanner.ports.add(port);
            target.close();
        }catch(UnknownHostException e){
            System.out.println(host+" is unknown");
        }catch (IOException e){}
    }
}

Wolfgang Brehm aka Lykos