[sdnog] sniffing the network by using JNetPcap

[Khadiga Elhassan]

Dear Aya:
good morning ,
 there is another tool for sniffing network is called WIRESHARK and it is
very easy to use and can be adjusted  according to your need ,you can try
it if you wish

khadiga

On Sat, Oct 15, 2016 at 2:23 PM, AYA FATHI <faya862 at gmail.com> wrote:

> Hi all :)
>
> Am trying to write  code sniffing the network by using JNetPcap lib on
> eclipse
>
> while running the code their is no error but its not capturing any thing
>
> any help
>
> the code as show below
>
>
>
> import java.util.ArrayList;
>
> import java.util.Date;
>
> import java.util.List;
>
> import java.util.Queue;
>
> import java.util.concurrent.ArrayBlockingQueue;
>
>
>
> import org.jnetpcap.ByteBufferHandler;
>
> import org.jnetpcap.Pcap;
>
> import org.jnetpcap.PcapHeader;
>
> import org.jnetpcap.PcapIf;
>
> import org.jnetpcap.packet.PcapPacket;
>
> import org.jnetpcap.packet.PcapPacketHandler;
>
>
>
>
>
> public class  wer {
>
>
>
>
>
>     public static void main(String[] args) {
>
>         List<PcapIf> alldevs = new ArrayList<PcapIf>(); // Will be filled
> with NICs
>
>         StringBuilder errbuf = new StringBuilder(); // For any error msgs
>
>
>
>         int r = Pcap.findAllDevs(alldevs, errbuf);
>
>
>
>         if (r == Pcap.NOT_OK || alldevs.isEmpty()) {
>
>             System.err.printf("Can't read list of devices, error is %s",
> errbuf
>
>                 .toString());
>
>             return;
>
>         }
>
>
>
>         System.out.println("Network devices found:");
>
>
>
>         int i = 0;
>
>         for (PcapIf device : alldevs) {
>
>             String description = (device.getDescription() != null) ?
> device.getDescription() : "No description available";
>
>             System.out.printf("#%d: %s [%s]\n", i++, device.getName(),
> description);
>
>         }
>
>
>
>         PcapIf device = alldevs.get(3); // We know we have atleast 1
> device
>
>
>
>         System.out.printf("\nChoosing '%s' on your behalf:\n",
> (device.getDescription() != null) ? device.getDescription()  :
> device.getName());
>
>
>
>         /***********************************************************
> ****************
>
>          * Second we open up the selected device
>
>          **************************************************************************/
>
>
>         int snaplen =  2048;           // Capture all packets, no
> trucation
>
>         int flags =  Pcap.MODE_PROMISCUOUS; // capture all packets
>
>         int timeout = 60 * 10000;           // 10 seconds in millis
>
>
>
>          Pcap pcap = Pcap.openLive(device.getName(), snaplen, flags,
> timeout, errbuf);
>
>          if (pcap == null) {
>
>              System.err.printf("Error while opening device for capture: "
>
>                  + errbuf.toString());
>
>              return;
>
>          }
>
>
>
>
>
>
>
>
>
>         PcapPacketHandler<String> jpacketHandler = new
> PcapPacketHandler<String>() {
>
>
>
>             public void nextPacket(PcapPacket packet, String user) {
>
>
>
>                 System.out.printf("Received packet at %s caplen=%-4d
> len=%-4d %s\n",
>
>                     new Date(packet.getCaptureHeader().timestampInMillis()),
>
>
>                     packet.getCaptureHeader().caplen(),  // Length
> actually captured
>
>                     packet.getCaptureHeader().wirelen(), // Original
> length
>
>                     user                                 // User supplied
> object
>
>                     );
>
>            System.out.print("\n fine"); }
>
>         };
>
>
>
>         pcap.loop(10, jpacketHandler, "jNetPcap rocks!");
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>        pcap.close();
>
>
>
>
>
>
>
>
>
>     }
>
>
>
>
> }
>
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>
>


-- 
Khadiga
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