Concurrent Connection less service in Computer Networks

Computer Network Lab Manual / Concurrent Connection less service in Computer Networks

Program Name

Write a C Program for Concurrent Connection less service in Computer Networks.

Theory


Server	Compiling	cc s.c -o sobj
Server	Running		./ sobj &
Client	Compiling	cc c.c
Client	Running		./a.out

Program Code


//Udpserver.c
#include <stdlib.h>
#include <stdio.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <netinet/in.h>

int main() 
{
 int sockfd, len;
 struct sockaddr_in serv, cli;
 char msg[40];
	
 sockfd = socket (AF_INET, SOCK_DGRAM, 0);

 serv.sin_family = AF_INET;
 serv.sin_addr.s_addr= inet_addr("10.2.0.7");
 serv.sin_port =  htons(51007); //convert to big-endian order
 
 bind(sockfd, (struct sockaddr *) &serv, sizeof(serv));

while(1)
{
 len=sizeof(cli);	
 recvfrom(sockfd, msg, sizeof(msg),0, (struct sockaddr *) &cli, &len);
 if (fork()==0)
 {
 sendto(sockfd, msg, sizeof(msg), 0, (struct sockaddr *) &cli, sizeof(cli));
 exit(0);
 }
}
 close(sockfd);
 return 0;
}



//Udpc.c
#include <stdlib.h>
#include <stdio.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <netinet/in.h>

int main() 
{
 int sockfd, len;
 struct sockaddr_in serv;
 char msg1[40], msg2[40];
	
 sockfd = socket (AF_INET, SOCK_DGRAM, 0);

 serv.sin_family = AF_INET;
 serv.sin_addr.s_addr= inet_addr("10.2.0.7");
 serv.sin_port =  htons(7); //convert to big-endian order
 len=sizeof(serv);	
 printf("\n Enter the string:\n");
 scanf("%s",msg1);
 sendto(sockfd, msg1, sizeof(msg1), 0, (struct sockaddr *) &serv, sizeof(serv));
 recvfrom(sockfd, msg2, sizeof(msg2),0, (struct sockaddr *) &serv, &len);
 printf("\n String received from the server:%s\n", msg2);
 close(sockfd);
 return 0;
 }

Input and Output:

Input
Enter the string:
hello

Output
String received from the server:hello

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