Network Pgm(1 5)

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1. PROGRAMS USING TCP SOCKETS

PROGRAM:

ECHO SERVER

import java.net.*;

import java.io.*;public class echoserver

{

public static void main(String args[])throws IOException{

ServerSocket serverSocket=null;

try

{

serverSocket=new ServerSocket(10007);}

catch(IOException e){

System.err.println("could not listen on port:10007");

System.exit(1);}

Socket clientSocket=null;

System.out.println("Waiting for connection...");

try{

clientSocket=serverSocket.accept();}catch(IOException e)

{

System.err.println("Accept failed");System.exit(1);

}

System.out.println("connection successful");System.out.println("waiting for input...");

PrintWriter out=new PrintWriter(clientSocket.getOutputStream(),true);

BufferedReader in=new BufferedReader(new

InputStreamReader(clientSocket.getInputStream()));String inputLine;

while((inputLine=in.readLine())!=null)

{System.out.println("Server=" + inputLine);

out.println(inputLine);

if(inputLine.equals("Bye"))break;

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}

out.close();

in.close();clientSocket.close();

serverSocket.close();

}}

ECHO CLIENT

import java.io.*;

import java.net.*;public class echoclient

{

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

{String serverHostname=new String("127.0.0.1");

if(args.length>0)serverHostname=args[0];

System.out.println("Attempting to connect to host" + serverHostname+"onport 10007");

Socket echoSocket=null;PrintWriter out=null;

BufferedReader in=null;

try

{//echoSocket=new Socket("taranis",7);

echoSocket=new Socket(serverHostname,10007);

out=new PrintWriter(echoSocket.getOutputStream(),true);in=new BufferedReader(new InputStreamReader(echoSocket.getInputStream()));

}

catch(UnknownHostException e){

System.err.println("Don't know about host:"+serverHostname);

System.exit(1);

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

String userInput;

System.out.print("input:");while((userInput=stdIn.readLine())!=null)

{

out.println(userInput);System.out.println("echo:"+ in.readLine());

System.out.println("input");

}

out.close();

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in.close();

stdIn.close();

echoSocket.close();} }

DATE AND TIME SERVER

import java.io.*;

import java.net.*;

import java.util.*;import java.lang.*;

class Tserver

{

public static void main(String as[ ])throws Exception{

Date d=new Date();

String s1=d.toString();

ServerSocket ss =new ServerSocket(1080);Socket s=ss.accept();

PrintWriter out=new PrintWriter(newOutputStreamWriter(s.getOutputStream()),true);

out.println(s1);

s.close();}

}

DATE AND TIME CLIENT

import java.net.*;

import java.io.*;

class Tclient{

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

{

InetAddress a=InetAddress.getLocalHost();Socket s=new Socket(a,1080);

BufferedReader in=new BufferedReader(new

InputStreamReader(s.getInputStream()));System.out.println(in.readLine());

s.close();

}}

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OUTPUT :

DATE AND TIME SERVER & CLIENT

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ECHO SERVER AND CLIENT

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2. PROGRAM USING UDP SOCKETS

PROGRAM :

import javax.naming.directory.Attributes;

import javax.naming.directory.InitialDirContext;

import javax.naming.NamingEnumeration;

import javax.naming.NamingException;

import java.net.InetAddress;

import java.net.UnknownHostException;

public class DNSLookup

{

public static void main(String args[])

{

if(args.length!=1)

{

System.err.println("print out DNS Record for an Internet Addresss");

System.err.println("USAGE:java DNSLookup domain Name/domain Address");

System.exit(-1);}

try

{

InetAddress inetAddress;

if(Character.isDigit(args[0].charAt(0)))

{

byte[]b=new byte[4];

String[]bytes=args[0].split("[.]");

for(int i=0;i

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inetAddress=InetAddress.getByAddress(b);

}

else

{

inetAddress=InetAddress.getByName(args[0]);

}

System.out.println(inetAddress.getHostName()+"/"+inetAddress.getHostAddress());

InitialDirContext iDirC=new InitialDirContext();

Attributes attributes=iDirC.getAttributes("dns:/"+inetAddress.getHostName());

NamingEnumeration attributeEnumeration=attributes.getAll();

System.out.println("--DNS Information--");

while(attributeEnumeration.hasMore())

{

System.out.println(""+attributeEnumeration.next());

}

attributeEnumeration.close();

}

catch(UnknownHostException exception)

{

System.err.println("ERROR:NO INTERNET Address for "+args[0]+"`");

}

catch(NamingException exception)

{

System.err.println("ERROR:NO DNS record for `"+args[0]+"`");

}

}

}

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OUTPUT :

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3. PROGRAM USING RPC

PROGRAM :

ADDSERVER

import java.net.*;

import java.rmi.*;

public class AddServer

{


{

try

{AddServerImpl addServerImpl=new AddServerImpl();

Naming.rebind("AddServer",addServerImpl);

}

catch(Exception e)

{

System.out.println("Exception :"+e);

}

}

}

ADDCLIENT

import java.rmi.*;

public class AddClient

{


{

try{

String addServerURL="rmi://"+args[0]+"/AddServer";

AddServerIntf addServerIntf=(AddServerIntf)Naming.lookup(addServerURL);

System.out.println("the first number is"+args[1]);

double d1=Double.valueOf(args[1]).doubleValue( );

System.out.println("the Second numberis"+args[2]);

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double d2=Double.valueOf(args[2]).doubleValue();

System.out.println("the sum is"+addServerIntf.add(d1,d2));

}

catch(Exception e)

{

System.out.println("Exception:"+e);

}

}

}

ADDSERVERIMPL

import java.rmi.*;

import java.rmi.server.*;

public class AddServerImpl extends UnicastRemoteObject implements AddServerIntf

{

public AddServerImpl()throws RemoteException

{}

public double add(double d1,double d2)throws RemoteException

{

return d1+d2;

}

}

ADDSERVERINTF

import java.rmi.*;

public interface AddServerIntf extends Remote

{

double add(double d1,double d2)throws RemoteException;

}

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OUTPUT :

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4. SLIDING WINDOW PROTOCOL

PROGRAM :

import java.io.*;

class p11sldwnd

{

int len;

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

{

p11sldwnd pvar = new p11sldwnd();

int a[] = new int[50];

int b[] = new int[50];

int n, wsz, i, j, k, t, v, ch, sdch, rvch;DataInputStream dis = new DataInputStream(System.in);

String st;

j = t = v = wsz = 0;

while(true)

{

System.out.println("\n\t\t\tSLIDING WINDOW PROTOCOL");

System.out.println("\t\t\t*************************\n");

System.out.println("\t\t1. Sender");

System.out.println("\t\t2. Receiver");

System.out.println("\t\t3. Exit");

System.out.print("\t\t Enter Your Choice : ");

st = dis.readLine();

ch = Integer.parseInt(st);

switch(ch)

{

case 1 :

bk1: while(true)

{

System.out.println("\n\t\tData Senders Menu");System.out.println("\t\t-----------------");

System.out.println("\t\t1. Store");

System.out.println("\t\t2. Window Size Set");

System.out.println("\t\t3. Transit");

System.out.println("\t\t4. Curret Window Items");


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sdch = Integer.parseInt(st);

switch(sdch)

{

case 1:

System.out.print("\n\t\t How many Data want to Store - n : ");


n = Integer.parseInt(st);

for(i=0; i

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}

break;

case 2:

bk2: while(true)

{

System.out.println("\n\t\tData Receivers Menu");

System.out.println("\t\t-------------------");

System.out.println("\t\t1. Receive");

System.out.println("\t\t2. Acknowledge");




rvch = Integer.parseInt(st);

switch(rvch)

{case 1:

System.out.println("\n\t\t The number of data Reveived ");

for(i=0; i < pvar.len; ++i)

System.out.println(b[i]);

break;

case 2:

System.out.print("\n\t\t Enter the number of data Acknowledged: ");


j = Integer.parseInt(st);

break;case 3:

break bk2;

}

}

break;

case 3:

System.exit(1);

}

}

}

}

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OUTPUT :

5. ROUTING PROTOCOLS

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PROGRAM :

#include

#includeint main()

{

int n;

int i,j,k;

int a[10][10],b[10][10];

printf("\n Enter the number of nodes:");

scanf("%d",&n);

for(i=0;i

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}

for(i=0;i

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OUTPUT :

Enter the number of nodes:4

Enter the distance between the host 1 - 1: 5
















5 9 6 4

2 1 8 3

6 1 4 2

5 1 8 2

THE OUTPUT MATRIX :

0 5 6 4

2 0 8 3

3 1 0 2

3 1 8 0

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Network Pgm(1 5)