Program for Reverse Address Resolutuion Protocol (RARP) using TCP

Client:

import java.io.*;

import java.net.*;

import java.util.*;

class Clientrarp

{

            public static void main(String args[])

            {

            try

            {         

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

                        Socket clsct=new Socket("127.0.0.1",139);

                        DataInputStream din=new DataInputStream(clsct.getInputStream());

                        DataOutputStream dout=new DataOutputStream(clsct.getOutputStream());

                        System.out.println("Enter the Physical Addres (MAC):");

                        String str1=in.readLine();

                        dout.writeBytes(str1+'\n');

                        String str=din.readLine();

                        System.out.println("The Logical address is(IP): "+str);                     

                        clsct.close();

            }

            catch (Exception e)

            {

            System.out.println(e);

            }

            }

}

Server:

import java.io.*;

import java.net.*;

import java.util.*;

class Serverrarp

{

            public static void main(String args[])

            {

            try

            {

                        ServerSocket obj=new ServerSocket(139);

                        Socket obj1=obj.accept();

                        while(true)

                        {

                                    DataInputStream din=new DataInputStream(obj1.getInputStream());

                                    DataOutputStream dout=new DataOutputStream(obj1.getOutputStream());

                                    String str=din.readLine();

                                    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<mac.length;i++)

                                    {

                                                if(str.equals(mac[i]))

                                                {

                                                            dout.writeBytes(ip[i]+'\n');

                                                            break;

                                                }

                                    }                     

                                    obj.close();

                        }

                       

            }

            catch(Exception e)

            {

                        System.out.println(e);

            }

            }

}

Output:

E:\networks>java Serverrarp

E:\networks>java Clientrarp

Enter the Physical Address (MAC):

6A:08:AA:C2

The  is Logical address(IP): 165.165.80.80