Android Open Source - networkScanner Pinger

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License

The source code is released under:

Apache License

Java Source Code

package com.unwind.netTools;
/* w ww .j a v  a2  s  .c  o  m*/

import com.unwind.netTools.model.Device;

import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;
import java.net.InetAddress;
import java.net.UnknownHostException;
import java.util.ArrayList;
import java.util.LinkedList;
import java.util.List;


public class Pinger {
  
  private static final int NUMTHREADS = 254; 

  
  public static List<Device> getDevicesOnNetwork(String subnet){
    LinkedList<InetAddress> resAddresses = new LinkedList<InetAddress>();
    DiscoverRunner[] tasks = new DiscoverRunner[NUMTHREADS];
    
    Thread[] threads = new Thread[NUMTHREADS];
    
    
    
    //Create Tasks and treads
    for(int i = 0; i < NUMTHREADS; i++){
      tasks[i] = new DiscoverRunner(subnet, 254/NUMTHREADS*i, 254/NUMTHREADS);
      threads[i] = new Thread(tasks[i]); 
    }
    //Starts threads
    for(int i = 0; i < NUMTHREADS; i++){
      threads[i].start(); 
    }
    
    for(int i = 0; i < NUMTHREADS; i++){
      try{
        threads[i].join();
      }catch(InterruptedException e){
        e.printStackTrace();
      }
    }
    
    for(int i = 0; i < NUMTHREADS; i++){
      for(InetAddress a: tasks[i].getResults()){
        try {
          a = InetAddress.getByName(a.getHostAddress());
        } catch (UnknownHostException e) {
          // TODO Auto-generated catch block
          e.printStackTrace();
        }
        resAddresses.add(a);
      }
    
    }

        ArrayList<Device> foundDev = new ArrayList<Device>(resAddresses.size());

        for (InetAddress a: resAddresses){
            foundDev.add(new Device(a.getHostAddress(), getMacFromArpCache(a.getHostAddress()), a.getCanonicalHostName()));
        }

    
    return foundDev;
  }
  
  /**
   * Try to extract a hardware MAC address from a given IP address using the
   * ARP cache (/proc/net/arp).<br>
   * <br>
   * We assume that the file has this structure:<br>
   * <br>
   * IP address       HW type     Flags       HW address            Mask     Device
   * 192.168.18.11    0x1         0x2         00:04:20:06:55:1a     *        eth0
   * 192.168.18.36    0x1         0x2         00:22:43:ab:2a:5b     *        eth0
   *
   * @param ip
   * @return the MAC from the ARP cache
   */
  public static String getMacFromArpCache(String ip) {
      if (ip == null)
          return null;
      BufferedReader br = null;
      try {
          br = new BufferedReader(new FileReader("/proc/net/arp"));
          String line;
          while ((line = br.readLine()) != null) {
              String[] splitted = line.split(" +");
              if (splitted != null && splitted.length >= 4 && ip.equals(splitted[0])) {
                  // Basic sanity check
                  String mac = splitted[3];
                  if (mac.matches("..:..:..:..:..:..")) {
                      return mac;
                  } else {
                      return null;
                  }
              }
          }
      } catch (Exception e) {
          e.printStackTrace();
      } finally {
          try {
            if(br!=null){
               br.close();
            }
             
          } catch (IOException e) {
              e.printStackTrace();
          }
      }
      return null;
  }
  
  

}

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