SOURCE CODE. //Socket Programming using TCP Sockets. Server.java

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1 SOURCE CODE //Socket Programming using TCP Sockets Server.java import java.io.*; import java.net.*; public class Server public static void main (String args[]) throws Exception ServerSocket sersock=new ServerSocket (3000); System.out.println ("Server ready for chatting"); Socket sock= sersock.accept (); BufferedReader KeyRead= new BufferedReader (new InputStreamReader (System.in)); OutputStream ofstream=sock.getoutputstream (); PrintWriter pwrite=new PrintWriter (ofstream, true); InputStream istream=sock.getinputstream (); BufferedReader receivedread=new BufferedReader (new InputStreamReader (istream)); String receivemessage, sendmessage; while (true) if ((receivemessage=receivedread.readline ())! =null) System.out.println (receivemessage); sendmessage=keyread.readline(); pwrite.println (sendmessage); System.out.flush ();

2 Client.java import java.io.*; import java.net.*; public class Client public static void main (String args[]) throws Exception Socket sock=new Socket (" ", 3000); BufferedReader KeyRead= new BufferedReader (new InputStreamReader (System.in)); OutputStream ofstream=sock.getoutputstream (); PrintWriter pwrite=new PrintWriter (ofstream, true); InputStream istream=sock.getinputstream (); BufferedReader receivedread=new BufferedReader (new InputStreamReader (istream)); System.out.println ("client ready for chatting"); String receivemessage, sendmessage; while (true) sendmessage=keyread.readline (); pwrite.println (sendmessage); System.out.flush (); if ((receivemessage=receivedread.readline ())! =null) System.out.println (receivemessage);

3 OUTPUT SERVER CLIENT

4 SOURCE CODE // Socket Programming using UDP Sockets UDPServer.java import java.io.*; import java.net.*; class UDPServer public static void main(string args[]) throws Exception DatagramSocket serversocket = new DatagramSocket(9876); byte[] receivedata = new byte[1024]; byte[] senddata = new byte[1024]; while(true) DatagramPacket receivepacket = new DatagramPacket(receiveData, receivedata.length); serversocket.receive(receivepacket); String sentence = new String( receivepacket.getdata()); System.out.println("RECEIVED: " + sentence); InetAddress IPAddress = receivepacket.getaddress(); int port = receivepacket.getport(); String capitalizedsentence = sentence.touppercase(); senddata = capitalizedsentence.getbytes(); DatagramPacket sendpacket =new DatagramPacket(sendData, senddata.length, IPAddress, port); serversocket.send(sendpacket);

5 UDPClient.java import java.io.*; import java.net.*; class UDPClient public static void main(string args[])throws Exception BufferedReader informuser= new BufferedReader(new InputStreamReader(System.in)); DatagramSocket clientsocket= new DatagramSocket(); InetAddress IpAddress=InetAddress.getByName("localhost"); byte[] senddata= new byte[1024]; byte[] recedata= new byte[1024]; String sen=informuser.readline(); senddata=sen.getbytes(); DatagramPacket sendpacket= new DatagramPacket(senddata,senddata.length,IpAddress,9876); clientsocket.send(sendpacket); DatagramPacket receivepacket = new DatagramPacket(recedata, recedata.length); clientsocket.receive(receivepacket); String uppersen = new String(receivepacket.getData()); System.out.println("FROM SERVER:\n" + uppersen); clientsocket.close();

6 OUTPUT SERVER CLIENT

7 SOURCE CODE //Applications using SOCKET Serverapp.java import java.io.*; import java.net.*; public class Serverapp public static void main (String args []) throws Exception String rmess, rmess1; ServerSocket sersock=new ServerSocket (3000); Socket sock=sersock.accept (); OutputStream ostream=sock.getoutputstream (); PrintWriter pwrite=new PrintWriter (ostream, true); InputStream istream=sock.getinputstream (); BufferedReader receivedread=new BufferedReader (new InputStreamReader (istream)); rmess =receivedread.readline (); rmess1=receivedread.readline (); System.out.println ("The two strings are: "+rmess+"\n"+rmess1); System.out.println ("After concatenating: "+rmess+rmess1);

8 Clientapp.java import java.io.*; import java.net.*; public class Clientapp public static void main (String args[]) throws Exception String rmess1, rmess2; Socket sock=new Socket (" ", 3000); BufferedReader keyread=new BufferedReader (new InputStreamReader (System.in)); OutputStream ostream=sock.getoutputstream (); PrintWriter pwrite=new PrintWriter (ostream, true); System.out.println ("Enter the string1:"); rmess1=keyread.readline (); System.out.println ("Enter the string2:"); rmess2=keyread.readline (); pwrite.println (rmess1); pwrite.println (rmess2); System.out.flush ();

9 OUTPUT SERVER CLIENT

10 SOURCE CODE // Simulation of Sliding Window Protocol Server.java: import java.io.*; import java.net.*; public class Server public static void main (String args []) throws Exception int [] rm=new int [100]; int lost, n, i, rlost; ServerSocket sersock=new ServerSocket (3000); Socket sock=sersock.accept (); BufferedReader keyread=new BufferedReader (new InputStreamReader (System.in)); OutputStream ofstream=sock.getoutputstream (); PrintWriter pwrite=new PrintWriter (ofstream, true); InputStream istream=sock.getinputstream (); BufferedReader receivedread=new BufferedReader (new InputStreamReader (istream)); n=integer.parseint (receivedread.readline ()); System.out.println ("the frames are:"); for (i=1; i<=n; i++) rm [i] =Integer.parseInt (receivedread.readline ()); System.out.println (rm [i]); System.out.println ("\n Enter the frame to be retransmitted :"); lost=integer.parseint (keyread.readline ()); pwrite.println (lost); rlost=integer.parseint (receivedread.readline ()); System.out.println ("\n The lost frame "+rlost+"is successfully transmitted");

11 Client.java import java.io.*; import java.net.*; public class Client public static void main (String args []) throws Exception int [] f=new int [100]; int receivemessage, n, lf; Socket sock=new Socket (" ", 3000); BufferedReader keyread=new BufferedReader (new InputStreamReader(System.in)); OutputStream ostream=sock.getoutputstream (); PrintWriter pwrite=new PrintWriter (ostream, true); InputStream istream=sock.getinputstream (); BufferedReader receivedread=new BufferedReader (new InputStreamReader (istream)); System.out.println ("enter the number of frames are:"); n=integer.parseint (keyread.readline ()); pwrite.println (n); for (int i=1; i<=n; i++) System.out.println ("enter the frames are:"+i+":"); f[i]=integer.parseint (keyread.readline ()); pwrite.println (f[i]); System.out.println ("\n the frames are:\n"); for (int i=1; i<=n; i++) System.out.println (f[i]); receivemessage =Integer.parseInt (receivedread.readline ()); lf=f [receivemessage]; pwrite.println (lf);

12 SERVER OUTPUT CLIENT

13 SOURCE CODE // Simulation of Routing Protocols #include<stdio.h> struct node unsigned dist[20]; unsigned from[20]; rt[10]; int main() int dmat [20] [20]; int n, i, j, k, count=0; printf ("\nenter the number of nodes: "); scanf ("%d", &n); printf ("\nenter the cost matrix: \n"); for (i=0; i<n; i++) for (j=0; j<n; j++) scanf ("%d", &dmat [i] [j]); dmat[i] [i]=0; rt[i].dist[j]=dmat[i][j]; rt[i].from[j]=j; do count=0; for (i=0; i<n; i++) for (j=0; j<n; j++) for(k=0; k<n; k++) if(rt[i].dist[j]>dmat[i][k]+rt[k].dist[j]) rt [i].dist [j]=rt [i].dist [k]+rt [k].dist [j];

14 rt [i].from[j]=k; count++; while (count! =0); for(i=0; i<n; i++) Printf ("\n\n State value for router %d is \n",i+1); For (j=0; j<n; j++) printf ("\t\n node %d via %d Distance%d", j+1,rt[i].from[j]+1,rt[i].dist [j]); Printf ("\n\n");

15 OUTPUT cc Router.c Enter the number of nodes: 4 Enter the cost matrix: State value for Router 1 is Node 1 via 1 Distance 0 Node 2 via 2 Distance 1 Node 3 via 3 Distance 2 Node 4 via 4 Distance 4 State value for Router 2 is Node 1 via 1 Distance 1 Node 2 via 2 Distance 0 Node 3 via 3 Distance 2 Node 4 via 4 Distance 3 State value for Router 3 is Node 1 via 1 Distance 3 Node 2 via 2 Distance 2 Node 3 via 3 Distance 0 Node 4 via 4 Distance 5 State value for Router 4 is Node 1 via 1 Distance 4 Node 2 via 2 Distance 3 Node 3 via 3 Distance 3 Node 4 via 4 Distance 0

16 SOURCE CODE //Domain Name Service- DNS DNSServer.java import java.io.*; import java.net.*; import java.util.*; class DNSServer public static void main (String args[]) throws Exception 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 (); InetAddress addr=receiver.getaddress (); int port=receiver.getport (); String ip[]=" "," "; String name[]=" for (int i=0; i<=ip.length; i++) if(s.equals(ip[i])) sendbyte=name[i].getbytes (); DatagramPacket sender=new DatagramPacket (sendbyte, sendbyte.length, addr, port); server.send (sender); break; else if (s.equals (name[i])) sendbyte=ip[i].getbytes ();

17 DatagramPacket sender=new DatagramPacket (sendbyte, sendbyte.length, addr, port); server.send (sender); break; break; DNSClient.java import java.io.*; import java.net.*; import java.util.*; class DNSClient public static void main (String args[]) throws Exception DatagramSocket client=new DatagramSocket (); InetAddress addr=inetaddress.getbyname (" "); byte[] sendbyte=new byte[1024]; byte[] receivebyte=new byte[1024]; BufferedReader in=new BufferedReader (new InputStreamReader (System.in)); System.out.println ("Enter domain name:"); String str=in.readline (); sendbyte=str.getbytes (); DatagramPacket sender=new DatagramPacket (sendbyte, sendbyte.length, addr, 1309); client.send (sender); DatagramPacket receiver=new DatagramPacket (receivebyte, sendbyte.length); client.receive (receiver); String s=new String (receiver.getdata ()); System.out.println ("IP ADDRESS or DOMAIN NAME "+s.trim ());

18 SERVER OUTPUT CLIENT

19 SOURCE CODE //MULTIUSER CHAT ChatServer.java import java.io.*; import java.net.*; public class ChatServer public static void main (String args[]) throws Exception int i; String smess, rmess, b="bye"; ServerSocket sersock=new ServerSocket (3000); System.out.println ("Server ready to chat :"); do System.out.println ("Client no :"); DataInputStream din=new DataInputStream (System.in); i=integer.parseint(din.readline()); if (i==0) System.out.println("client" +i+"is connected :"); Socket sock=sersock.accept(); do BufferedReader kread=new BufferedReader (new InputStreamReader (System.in)); OutputStream os=sock.getoutputstream(); PrintWriter pw=new PrintWriter (os, true); InputStream ist=sock.getinputstream(); BufferedReader br=new BufferedReader(new InputStreamReader(ist)); rmess=br.readline(); System.out.println(rmess); smess=kread.readline(); pw.println(smess);

20 System.out.flush(); while((rmess.comparetoignorecase(b))!=0); while(i!=0); ChatClient1.java import java.io.*; import java.net.*; public class ChatClient1 public static void main(string args[]) throws Exception Socket sock=new Socket(" ", 3000); BufferedReader keyread=new BufferedReader(new InputStreamReader(System.in)); OutputStream ostream=sock.getoutputstream(); PrintWriter pwrite=new PrintWriter(ostream, true); InputStream istream=sock.getinputstream(); BufferedReader receivedread=new BufferedReader(new InputStreamReader(istream)); System.out.println("client is ready for chat"); String rmess, smess, b="bye"; do smess=keyread.readline(); pwrite.println(smess); System.out.flush(); rmess=receivedread.readline(); System.out.println(rmess); while(smess.comparetoignorecase(b)!=0);

21 ChatClient2.java import java.io.*; import java.net.*; public class ChatClient2 public static void main(string args[]) throws Exception Socket sock=new Socket(" ", 3000); BufferedReader keyread=new BufferedReader(new InputStreamReader(System.in)); OutputStream ostream=sock.getoutputstream(); PrintWriter pwrite=new PrintWriter(ostream, true); InputStream istream=sock.getinputstream(); BufferedReader receivedread=new BufferedReader(new InputStreamReader(istream)); System.out.println("client is ready for chat"); String rmess, smess, b="bye"; do smess=keyread.readline(); pwrite.println(smess); System.out.flush(); rmess=receivedread.readline(); System.out.println(rmess); while(smess.comparetoignorecase(b)!=0);

22 OUTPUT SERVER CLIENT-1

23 CLIENT-2 ME -Networking Lab

24 SOURCE CODE // #include <stdlib.h> #include <string.h> #define cknull(x) if((x)==null) perror(""); exit(exit_failure); #define cknltz(x) if((x)<0) perror(""); exit(exit_failure); #define LIST_LEN 4 void _it(char *filename); main() char fname[15]; printf("enter the filename\n"); scanf("%s",fname); _it(fname); void _it(char *filename) char tmp[256]=0x0; char fpbuffer[400]=0x0; char _list[list_len][256]="mecse3@localhost.localdomain",0x0; int i=0; for(i=0;* _list[i]>0x0;i++) cknull(strcpy(tmp, _list[i])); cknltz(sprintf (fpbuffer,"mail -s '%s %s' %s < %s","please Review:", filename, tmp, filename)); if(system (fpbuffer)==(-1)) perror(" failure"); exit(exit_failure);

25 OUTPUT Enter the file name: sample.c /home/1me1/dead.letter.saved message in /home/1me1/dead.letter..

26 SOURCE CODE //Download a file using HTTP <html> <title>mca</title> <body background="file:///z:/user/perisonal/images/light%20work.jpg"/><center> <blink>wellcome TO CCET </blink> your APPLICATION SUBMITED SUCCESFULLY<a href=" CCET</a> <a href="file:///z:/add%20on%20course/html/syll11.docx"> Download File</a> </center> </body> </html>

27 OUTPUT ME -Networking Lab

28 SOURCE CODE //Simulation of Network Management Protocol Manager.java import java.io.*; import java.net.*; public class Manager public static void main(string args[])throws Exception String rmess1, smess, rmess2; int ch=0; Socket sock=new Socket(" ", 3000); BufferedReader keyread=new BufferedReader(new InputStreamReader(System.in)); OutputStream ostream=sock.getoutputstream(); PrintWriter pwrite=new PrintWriter(ostream, true); InputStream istream=sock.getinputstream(); BufferedReader receivedread=new BufferedReader(new InputStreamReader(istream)); System.out.println("Manager\n1.TCP CONNECTION\n2.SYSTEM DETAILS\nEnter your choice:"); ch=integer.parseint(keyread.readline()); if(ch==1) System.out.println("Enter the object ID for client:"); smess=keyread.readline(); pwrite.println(smess); rmess1=receivedread.readline(); System.out.println("The window size of "+smess+" for TCP connection is "+rmess1); else if(ch==2) System.out.println("Enter the object ID for System:"); smess=keyread.readline(); pwrite.println(smess);

29 System.out.flush(); rmess1=receivedread.readline(); rmess2=receivedread.readline(); System.out.println("The manufacturing date for "+smess+" is "+rmess1+"\n The time of last utilization for "+smess+" is "+rmess2); Agent1.java import java.io.*; import java.net.*; public class Agent1 public static void main(string args[])throws Exception String rmess, smess; String oid[]="client1","client2","client3","client4","client5"; String wsize[]="5","10","15","20","25"; ServerSocket sersock=new ServerSocket(3000); Socket sock=sersock.accept(); System.out.println("Agent1:\nAgen1 is ready!!"); OutputStream ostream=sock.getoutputstream(); PrintWriter pwrite=new PrintWriter(ostream, true); InputStream istream=sock.getinputstream(); BufferedReader receivedread=new BufferedReader(new InputStreamReader(istream)); rmess=receivedread.readline(); for(int i=0;i<5;i++) if(rmess.equals(oid[i])) pwrite.println(wsize[i]); break;

30 Agent2.java import java.io.*; import java.net.*; public class Agent2 public static void main(string args[])throws Exception String rmess; String oid[]="system1","system2","system3","system4","system5"; String mdate[]=" "," "," "," "," "; String time[]="9.a.m","10.a.m","11.a.m","10.p.m","12.p.m"; ServerSocket sersock=new ServerSocket(3000); Socket sock=sersock.accept(); System.out.println("Agent2:\n Agent2 is ready!"); OutputStream ostream=sock.getoutputstream(); PrintWriter pwrite=new PrintWriter(ostream, true); InputStream istream=sock.getinputstream(); BufferedReader receivedread=new BufferedReader(new InputStreamReader(istream)); rmess=receivedread.readline(); for(int i=0; i<5; i++) if(rmess.equals(oid[i])) pwrite.println(mdate[i]); pwrite.println(time[i]); break;

31 MANAGER - TCP CONNECTION OUTPUT AGENT 1

32 MANAGER SYSTEM DETAILS AGENT2

CPSC 441 UDP Socket Programming. Department of Computer Science University of Calgary

CPSC 441 UDP Socket Programming Department of Computer Science University of Calgary Socket programming using UDP (vs TCP) UDP: no connection between client and server vno handshaking vsender explicitly