// Counting the number of packets in pcap files.

// User defined package
package jnt;

import java.io.File;
import org.jnetpcap.Pcap;
import org.jnetpcap.packet.JPacket;
import org.jnetpcap.packet.JPacketHandler;

public class PacketCounter {

    // Path of the folder having pcap files
    // generated by Wireshark(change accordingly)
    static String folderpath
        = "/home/folder_where_you_have_pcap_files";

    static double count = 0;
    static double globalcount = 0;

    // main function starts here
    public static void main(String[] args)
    {

        // Making the object of a file
        // and giving that object address
        // of the pcap folder
        File file = new File(folderpath);

        // Making file array which is used
        // to access each file
        // inside the folder one-by-one
        File[] files = file.listFiles();

        // Accessing each file
        // one-by-one of files array
        for (File f : files) {

            // Getting each pcap file name
            String FILENAME
                = folderpath + f.getName();

            // StringBuilder is used to get
            // error messages in case
            // if any error occurs
            StringBuilder errbuf = new StringBuilder();

            // Making Pcap object an opening pcap file
            // in offline mode and passing pcap filename
            // and StringBuilder object to the function
            Pcap pcap = Pcap.openOffline(FILENAME, errbuf);

            // Here pcap object is used to start a loop
            // for capturing each  packet of an
            // each pcap file(as a pcap file can
            // have many packets) one at a time, here -1
            // indicates eof(end of file) i.e
            // until every packet is captured execute the
            // loop, we can also give some value
            // instead of -1 which will indicate the
            // number of packets to execute
            // in each pcap file

            pcap.loop(-1, new JPacketHandler() {

                // nextPacket is override function
                // of JPacketHandler( Handler which is
                // use to receive fully decoded packets)
                public void nextPacket(JPacket packet,
                                       StringBuilder errbuf)
                {

                    // counter to count the number of packet
                    // in each pcap file
                    count++;
                }
            }, errbuf);

            System.out.println("File : " + f.getName()
                               + " Number of Packets : "
                               + count);

            // Global counter to count the total number
            // of packets in all pcap file
            globalcount = globalcount + count;

            count = 0;
        }

        System.out.println("Total Packets in folder : "
                           + globalcount);
    }
}