Program for Domain Name System (DNS) using TCP
Client:
import java.io.*;
import java.net.*;
import java.util.*;
class Clientdns
{
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 Address (IP or DOMAIN NAME):");
String str1=in.readLine();
dout.writeBytes(str1+'\n');
String str=din.readLine();
System.out.println("DOMAIN NAME or IP: "+str);
clsct.close();
}
catch (Exception e)
{
System.out.println(e);
}
}
}
Server:
import java.io.*;
import java.net.*;
import java.util.*;
class Serverdns
{
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"};
String name[]={"www.skcet.ac.in","www.skcetlib.ac.in"};
for(int i=0;i<ip.length;i++)
{
if(str.equals(ip[i]))
{
dout.writeBytes(name[i]+'\n');
break;
}
else if(str.equals(name[i]))
{
dout.writeBytes(ip[i]+'\n');
break;
}
}
obj.close();
}
}
catch(Exception e)
{
System.out.println(e);
}
}
}
Output:
E:\networks>java Clientdns
Enter the Address (IP or DOMAIN NAME):
www.skcet.ac.in
DOMAIN NAME or IP: 165.165.80.80
E:\networks>java Clientdns
Enter the Address (IP or DOMAIN NAME):
165.165.79.1
DOMAIN NAME or IP: www.skcetlib.ac.in
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