7 Nov '14

Anupa Manipal

A professional Software Developer in VB.NET - SQL Server and learner of PHP. Expertise in implementation of various projects including designing, development, coding and implementation of software applications.

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UDP Program – DNS CLIENT-SERVER

UDP Program (DNS CLIENT-SERVER)

AIM : To create a client server program to Domain Name System using the UDP protocol client server.

ALGORITHM

Server

  • Declare the necessary arrays and variables.
  • Set server port address using socket().
  • Get the current message.
  • Connect to the client.
  • Stop the process.

Client

  • Set the client machine address.
  • Connect to the server.
  • Read from the server the current message.
  • Display the current message.
  • Close the connection.

PROGRAM:

UDPclient

import java .io.*;

import java.net.*;

classUDPclient

{

public static DatagramSocket ds;

public static intclientport=789,serverport=790;

public static void main(String args[])throws Exception

{

byte buffer[]=new byte[1024];

ds=new DatagramSocket(serverport);

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

System.out.println(“server waiting”);

InetAddressia=InetAddress.getLocalHost();

while(true)

{

System.out.println(“Client:”);

String str=dis.readLine();

if(str.equals(“end”))

break;

buffer=str.getBytes();

ds.send(new DatagramPacket(buffer,str.length(),ia,clientport));

DatagramPacket p=new DatagramPacket(buffer,buffer.length);

ds.receive(p);

String psx=new String(p.getData(),0,p.getLength());

System.out.println(“Server:” + psx);

}

}

}

UDP server

import java.io.*;

import java.net.*;

classUDPserver

{

public static DatagramSocket ds;

public static byte buffer[]=new byte[1024];

public static intclientport=789,serverport=790;

public static void main(String args[])throws Exception

{

ds=new DatagramSocket(clientport);

System.out.println(“press ctrl+c to quit the program”);

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

InetAddressia=InetAddress.getLocalHost();

while(true)

{

DatagramPacket p=new DatagramPacket(buffer,buffer.length);

ds.receive(p);

String psx=new String(p.getData(),0,p.getLength());

System.out.println(“Client:” + psx);

InetAddressib=InetAddress.getByName(psx);

System.out.println(“Server output:”+ib);

String str=dis.readLine();

if(str.equals(“end”))

break;

buffer=str.getBytes();

ds.send(new DatagramPacket(buffer,str.length(),ia,serverport));

}

}

}

OUTPUT:

UDPclient

C:\Program Files\Java\jdk1.6.0\bin>javac UDPclient.java

C:\Program Files\Java\jdk1.6.0\bin>java UDPclient

Server waiting

Client:www.yahoo.com

UDPserver

C:\Program Files\Java\jdk1.6.0\bin>javac UDPserver.java

C:\Program Files\Java\jdk1.6.0\bin>java UDPserver

Press ctrl+c to quit the program

Client:www.yahoo.com

Server output:www.yahoo.com/106.10.170.115

RESULT:

Thus client server program to Domain Name System using the UDP protocol client server has been executed and verified successfully.

About Anupa Manipal

A professional Software Developer in VB.NET - SQL Server and learner of PHP. Expertise in implementation of various projects including designing, development, coding and implementation of software applications.

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