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Wednesday, 27 July 2011

Program for Reverse Address Resolutuion Protocol (RARP) using UDP

Client:
import java.io.*;
import java.net.*;
import java.util.*;
class Clientrarp12
{
            public static void main(String args[])
            {
            try
            {
                        DatagramSocket client=new DatagramSocket();
                        InetAddress addr=InetAddress.getByName("127.0.0.1");
                        byte[] sendbyte=new byte[1024];
                        byte[] receivebyte=new byte[1024];
                        BufferedReader in=new BufferedReader(new InputStreamReader(System.in));
                        System.out.println("Enter the Physical address (MAC):");
                        String str=in.readLine();
                        sendbyte=str.getBytes();
                        DatagramPacket sender=new DatagramPacket(sendbyte,sendbyte.length,addr,1309);
                        client.send(sender);
                        DatagramPacket receiver=new DatagramPacket(receivebyte,receivebyte.length);
                        client.receive(receiver);
                        String s=new String(receiver.getData());
                        System.out.println("The Logical Address is(IP): "+s.trim());
                        client.close();
            }
            catch(Exception e)
            {
                        System.out.println(e);
            }
            }
}

Server:
import java.io.*;
import java.net.*;
import java.util.*;
class Serverrarp12
{
            public static void main(String args[])
            {
            try
            {
                        DatagramSocket server=new DatagramSocket(1309);
                        while(true)
                        {
                                    byte[] sendbyte=new byte[1024];
                                    byte[] receivebyte=new byte[1024];
                                    DatagramPacket receiver=new DatagramPacket(receivebyte,receivebyte.length);
                                    server.receive(receiver);
                                    String str=new String(receiver.getData());
                                    String s=str.trim();
                                    //System.out.println(s);
                                    InetAddress addr=receiver.getAddress();
                                    int port=receiver.getPort();
                                    String ip[]={"165.165.80.80","165.165.79.1"};
                                    String mac[]={"6A:08:AA:C2","8A:BC:E3:FA"};
                                    for(int i=0;i<ip.length;i++)
                                    {
                                                if(s.equals(mac[i]))
                                                {
                                                            sendbyte=ip[i].getBytes();
                                                            DatagramPacket sender=new DatagramPacket(sendbyte,sendbyte.length,addr,port);
                                                            server.send(sender);
                                                            break;
                                                }
                                    }
                                    break;


                        }
            }
            catch(Exception e)
            {
                        System.out.println(e);
            }
            }
}

Output:
I:\ex>java Serverrarp12
I:\ex>java Clientrarp12
Enter the Physical address (MAC):
6A:08:AA:C2
The Logical Address is(IP): 165.165.80.80

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