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Thread: Help with newtwork packet sniffer

  1. #1
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    Default Help with newtwork packet sniffer

    Trying to write a network packet sniffer using jpcap in eclipse. At runtime i get this error:

    Exception in thread "main" java.lang.UnsatisfiedLinkError: jpcap.JpcapCaptor.getDeviceList()[Ljpcap/NetworkInterface;
    at jpcap.JpcapCaptor.getDeviceList(Native Method)
    at pktSniffer.main(pktSniffer.java:20)


    import jpcap.*;
    import jpcap.packet.Packet;
    import jpcap.PacketReceiver;
     
    public class pktSniffer implements PacketReceiver {
     
    public void receivePacket(Packet packet){
     
            System.out.println(packet);
    }
     
    public static void main(String[] args) throws java.io.IOException{
     
        NetworkInterface[] lists=jpcap.JpcapCaptor.getDeviceList();
     
        System.out.println("\n\t\t***Network Sniffer***\n");
     
        System.out.println("Found the following devices : ");
     
        for(NetworkInterface s: lists)
        {
            System.out.println("Name: " + s.name +" Description: " + s.description);
        }
     
        JpcapCaptor jpcap=JpcapCaptor.openDevice(JpcapCaptor.getDeviceList()[1],1000,false,20);
        jpcap.loopPacket(-1,new pktSniffer());
     
        }
    }


  2. #2
    Super Moderator Norm's Avatar
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    Default Re: Help with newtwork packet sniffer

    Have you looked up the definition of that error in the API doc?
    Look for the class: UnsatisfiedLinkError

  3. #3

    Default Re: Help with newtwork packet sniffer

    Why are you trying to sniff packets? Is it a Java exercise or is it just to see what packets are being transmitted?

    If your goal is just to sniff packets to see them, Wireshark is a great tool to use.

    Wireshark Go deep.
    Kenneth Walter
    Software Developer
    http://kennywalter.com

  4. #4
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    Default Re: Help with newtwork packet sniffer

    Actually was tyring to sniff packets so i could sniff out and save the packets (cookies)

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