Concurrent Connection Oriented service in Computer Networks

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

Program Name

Write a C Program for Concurrent Connection Oriented 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


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

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

 serv.sin_family = AF_INET;
 serv.sin_addr.s_addr= inet_addr("10.2.0.7");
 serv.sin_port =  htons(56007); //convert to big-endian order

 bind(sockfd, (struct sockaddr *) &serv, sizeof(serv));
 listen(sockfd,5);

while(1)
{
 len=sizeof(serv);
 listenfd=accept(sockfd, (struct sockaddr *)&serv, &len);

 if (fork()==0)
{
 close(sockfd);
 recv(listenfd, msg1, sizeof(msg1), 0);
 send(listenfd, msg1, sizeof(msg1),0);
 exit(0);
}
 close(listenfd);
}
 close(sockfd);
 return 0;
}



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

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

 serv.sin_family = AF_INET;
 serv.sin_addr.s_addr= inet_addr("10.2.0.7");
 serv.sin_port =  htons(56007); //convert to big-endian order
	
 connect(sockfd, (struct sockaddr *) &serv, sizeof(serv));

 printf("\nEnter the string:\n");
 scanf("%s",msg1);
 send(sockfd, msg1, sizeof(msg1), 0);
 recv(sockfd, msg2, sizeof(msg2),0);
 printf("\nString received from the server:%s\n", msg2);
 close(sockfd);
 return 0;
 }

Input:
Enter the string:
hello

Output:
String received from the server:hello

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