Iterative Connection less Server in Computer Networks

Computer Network Lab Manual / Iterative Connection less Server in Computer Networks

Program Name

Write a C Program for Iterative Connection less Server 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


//vi s.c (server progrm)
// Iterative Connection Oriented Server Code Using Port No 7

#include<stdio.h>
#include<unistd.h>
#include<sys/types.h>
#include<sys/socket.h>
#include<netinet/in.h>
#include<stdlib.h>
#include<time.h>
#include<string.h>
main()
{
int sockfd,j,servlen;
char msg[20];
struct sockaddr_in sa;
time_t pt;
sockfd=socket(AF_INET,SOCK_DGRAM,0);
if(sockfd<0)
{
perror("socket not created");
exit(0);
}
sa.sin_family=AF_INET;
sa.sin_port=htons(7027);
sa.sin_addr.s_addr=inet_addr("10.2.0.7");
j=bind(sockfd,(struct sockaddr *)&sa,sizeof(sa));
if(j<0)
{
perror("bind error");
exit(0);
}
printf("%d\n",j);
servlen=sizeof(sa);
recvfrom(sockfd,msg,sizeof(msg),0,(struct sockaddr *)&sa,&servlen);
pt=time(NULL);
strcpy(msg,ctime(&pt));
sendto(sockfd,msg,sizeof(msg),0,(struct sockaddr *)&sa,sizeof(sa));
}




//vi c.c (Client progrm)
// Iterative Connection Oriented Client Code Using Port No 7

#include<stdio.h>
#include<sys/types.h>
#include<unistd.h>
#include<sys/socket.h>
#include<arpa/inet.h>
#include<netinet/in.h>
#include<stdlib.h>
main()
{
int sockfd,servlen;
char buff1[20],buff2[20];
struct sockaddr_in sa;
sockfd=socket(AF_INET,SOCK_DGRAM,0);
if(sockfd<0)
{
 perror("socket not created");
 exit(0);
}
sa.sin_family=AF_INET;
sa.sin_port=htons(7027);
sa.sin_addr.s_addr=inet_addr("10.2.0.7");
printf("enter a message: ");
scanf("%s",buff1);
sendto(sockfd,buff1,20,0,(struct sockaddr *)&sa,sizeof(sa));
servlen=sizeof(sa);
recvfrom(sockfd,buff2,20,0,(struct sockaddr *)&sa,&servlen);
printf("Date and Time is %s",buff2);
}

Input:
enter a message: globe
hello

Output:
Date and Time is Mon Mar 02 12:09:53

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