Is there anybody that have jpcap ( rawsocket ) examples Thanks

Question

I'am an Italian programmers, sorry i speak a little English.
I downloaded from http://www.goto.info.waseda.ac.jp/~fujii/jpcap/index.html , jpcap pakage.
By it i can read and send packet/rawsocket.
When i capturing packet it's all ok.
When i want send packet i have an exception: java.io.IOException: sendto error
probably i have not setting any field.
Is there anybody that can help-me.
Is there anybody that have some examples that explain how to send packet ( ICMP,TCP,UDP )
In the pakage documentation i dont find nothing.
In the pakage documentation there is only a tcpdump examples.
Thanks you ulisse640
p.s. Below there is the code that give the error.
package progetto10;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import jpcap.*;
public class Frame1 extends JFrame {
JPanel contentPane;
JButton jButton1 = new JButton();
String device = "\\Device\\Packet_{6B0E8DE3-8F46-41E3-B3BD-673C59BB0028}";
BorderLayout borderLayout1 = new BorderLayout();
/**Construct the frame*/
public Frame1() {
enableEvents(AWTEvent.WINDOW_EVENT_MASK);
try
jbInit();
catch(Exception e)
e.printStackTrace();
/**Component initialization*/
private void jbInit() throws Exception {
//setIconImage(Toolkit.getDefaultToolkit().createImage(Frame1.class.getResource("[Your Icon]")));
contentPane = (JPanel) this.getContentPane();
contentPane.setLayout(borderLayout1);
this.setSize(new Dimension(400, 300));
this.setTitle("Frame Title");
jButton1.setText("Bottone");
jButton1.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(ActionEvent e) {
jButton1_actionPerformed(e);
contentPane.add(jButton1, BorderLayout.CENTER);
/**Overridden so we can exit when window is closed*/
protected void processWindowEvent(WindowEvent e) {
super.processWindowEvent(e);
if (e.getID() == WindowEvent.WINDOW_CLOSING) {
System.exit(0);
void jButton1_actionPerformed(ActionEvent e) {
try
Jpcap jpcap = null;
IPAddress.setAddressConvert(true);
String[] devices = Jpcap.getDeviceList();
for( int i=0; i<devices.length; i++ )
System.out.println( devices[i] );
jpcap = new Jpcap(device,1500,true ,200);
UDPPacket pack = createUDP(); //TCPPacket pack = createTCP();
System.out.println("");
System.out.println("openRawSocket");
jpcap.openRawSocket();
jpcap.sendPacket( pack );
jpcap.close();
catch(Exception ex)
ex.printStackTrace();
public EthernetPacket createEthernetPacket() throws Exception {
EthernetPacket ep = new EthernetPacket();
ep.frametype = 2048;
String strdst = new String("00:50:ba:49:6c:9b");
ep.dst_mac = strdst.getBytes();
String strsrc = new String("00:00:e2:44:b8:dd");
ep.src_mac = strsrc.getBytes();
return ep;
public UDPPacket createUDP() throws Exception {
UDPPacket up = new UDPPacket( 80,333 );
//up.setIPv4Parameter(0,false,false,false,false,false,false,0,1,255,17,new IPAddress("100.100.100.1"),new IPAddress("100.100.100.2"));
up.src_ip = new IPAddress("100.100.100.1");
up.dst_ip = new IPAddress("100.100.100.2");
up.dont_frag = true;
up.protocol = 17;
up.ident = 1;
up.offset = 0;
up.version = 4;
up.data = "".getBytes();
up.hop_limit = 128;
up.length = 48;
displayUDP( up );
return up;
public TCPPacket createTCP() throws Exception {
TCPPacket tp = new TCPPacket(80,333,5215133,0,false,false,false,false,true,false,8192,0);
//tp.setIPv4Parameter(0,false,false,false,false,false,false,0,1,255, 6,new IPAddress("100.100.100.1"),new IPAddress("100.100.100.2"));
tp.src_ip = new IPAddress("100.100.100.1");
tp.dst_ip = new IPAddress("100.100.100.2");
tp.dont_frag = true;
tp.protocol = 6;
tp.ident = 1;
tp.offset = 0;
tp.version = 4;
tp.data = "".getBytes();
tp.hop_limit = 128;
tp.length = 48;
displayTCP( tp );
return tp;
public void displayUDP(UDPPacket packet) {
System.out.println( "UDP Packet");
System.out.println("-----------------");
System.out.println("caplen:" +packet.caplen        );
System.out.println("sec:" +packet.sec           );
System.out.println("usec:" +packet.usec          );
System.out.println("datalink:" +packet.datalink      );
System.out.println("data:" +packet.data.length   );
System.out.println("-----------------");
System.out.println("priority:" +packet.priority      );
System.out.println("d_flag:" +packet.d_flag        );
System.out.println("t_flag:" +packet.t_flag        );
System.out.println("r_flag:" +packet.r_flag        );
System.out.println("rsv_frag:" +packet.rsv_frag      );
System.out.println("dont_frag:"+packet.dont_frag );
System.out.println("more_frag:"+packet.more_frag );
System.out.println("offset:" +packet.offset        );
System.out.println("ident:" +packet.ident         );
System.out.println("ttl: ** not found **" );
System.out.println("protocol:" +packet.protocol      );
System.out.println("src_ip:" +packet.src_ip        );
System.out.println("dst_ip:" +packet.dst_ip        );
System.out.println("length:" +packet.length        );
System.out.println("version:" +packet.version       );
System.out.println("hop_limit:"+packet.hop_limit );
System.out.println("-----------------");
System.out.println("src_port:" +packet.src_port      );
System.out.println("dst_port:" +packet.dst_port      );
public void displayTCP(TCPPacket packet) {
System.out.println( "TCP Packet");
System.out.println("-----------------");
System.out.println("caplen:" +packet.caplen        );
System.out.println("sec:" +packet.sec           );
System.out.println("usec:" +packet.usec          );
System.out.println("datalink:" +packet.datalink      );
System.out.println("data:" +packet.data.length   );
System.out.println("-----------------");
System.out.println("priority:" +packet.priority      );
System.out.println("d_flag:" +packet.d_flag        );
System.out.println("t_flag:" +packet.t_flag        );
System.out.println("r_flag:" +packet.r_flag        );
System.out.println("rsv_frag:" +packet.rsv_frag      );
System.out.println("dont_frag:"+packet.dont_frag );
System.out.println("more_frag:"+packet.more_frag );
System.out.println("offset:" +packet.offset        );
System.out.println("ident:" +packet.ident         );
System.out.println("ttl: ** not found **" );
System.out.println("protocol:" +packet.protocol      );
System.out.println("src_ip:" +packet.src_ip        );
System.out.println("dst_ip:" +packet.dst_ip        );
System.out.println("length:" +packet.length        );
System.out.println("version:" +packet.version       );
System.out.println("hop_limit:"+packet.hop_limit );
System.out.println("-----------------");
System.out.println("src_port:" +packet.src_port      );
System.out.println("dst_port:" +packet.dst_port      );
System.out.println("sequence:" +packet.sequence      );
System.out.println("ack_num:" +packet.ack_num       );
System.out.println("urg:" +packet.urg           );
System.out.println("ack:" +packet.ack           );
System.out.println("psh:" +packet.psh           );
System.out.println("rst:" +packet.rst           );
System.out.println("syn:" +packet.syn           );
System.out.println("fin:" +packet.fin           );
System.out.println("window:" +packet.window        );
System.out.println("urgent:" +packet.urgent_pointer);
}

Answer 1

I have done quite a bit of work with the jpcap software. The tcp dump functionality works fine but as you stated there are problems with the send. I hope you are fimilar with C programming because there are bugs in the native implementation that you will unfortunutely need to work out.
I have the source code that I worked on at work or I would send it to you now. If you would like a copy of my updated version of the C code then send me an email. It's not perfect but its a start. BTW -- what operating system are you attempting to run this on? I only have patched the code for windows.
[email protected]