package capture;

import net.sourceforge.jpcap.capture.PacketCapture;
import net.sourceforge.jpcap.capture.CaptureDeviceLookupException;

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.IOException;

/**
 * Simple packet capture framework.
 *
 * This class is free to use, but please leave the header intact.
 * See www.remoteroot.co.uk for more information.
 *
 * User: joe.hancock@gmail.com
 * Date: 29-Nov-2005
 * Time: 23:23:24
 */
class Monitor {
    private String filter = "";

    public static void main (String Args[]) {
        Monitor mon = new Monitor();
        mon.captureMenu();
    }

    private void captureMenu()   {
        System.out.println("Please enter a BPF filter.");

        BufferedReader buf = new BufferedReader(new InputStreamReader(System.in));

        try {
            filter = buf.readLine();
        }
        catch (IOException e)   {
            e.printStackTrace();
        }

        this.selectDevice(filter);
    }

    private void selectDevice(String filter)   {
        BufferedReader buf = new BufferedReader(new InputStreamReader(System.in));
        String device = "";

        try {
            String[] devs = PacketCapture.lookupDevices();
            for(int i = 0; i < devs.length ; i++) {
	            System.out.println(i + "\t" + devs[i]);
            }
        }
        catch(CaptureDeviceLookupException e)   {
            e.printStackTrace();
        }

        System.out.println("Enter devicename: ");

        try {
            device = buf.readLine();
        }
        catch (IOException e)   {
            e.printStackTrace();
        }

        this.init(filter, device);
    }

    private static void init(String filter, String device) {
       MainCapture sniffer = new MainCapture(device, filter);
        try {
            System.out.println("Monitering network for \"" + filter + "\"");
            sniffer.initCapture();
        }
        catch (Exception e) {
            e.printStackTrace();
        }
    }
}