UDP Time Server Program

tserver.c

#include "stdio.h"
#include "string.h"
#include "stdlib.h"
#include "sys/socket.h"
#include "sys/types.h"
#include "netinet/in.h"
#include "time.h>
int main()
{
int sfd,r,bi,port;
char buff[1024];
struct sockaddr_in servaddr,cliaddr;
socklen_t clilen;
sfd=socket(AF_INET,SOCK_DGRAM,0);
if(sfd==-1)
{
perror("Socket");
return 0;
}
memset(servaddr.sin_zero,'\0',sizeof(servaddr.sin_zero));
printf("\n Enter the port no:");
scanf("%d",&port);
printf("\n The port no is:%d",port);
servaddr.sin_family = AF_INET;
servaddr.sin_port = htons(port);
servaddr.sin_addr.s_addr = INADDR_ANY;
bi=bind(sfd,(struct sockaddr*)&servaddr,sizeof(servaddr));
if(bi==-1)
{
perror("Bind()");
return 0;
}
clilen = sizeof(cliaddr);
r=recvfrom(sfd,buff,sizeof(buff),0,(struct sockaddr*)&cliaddr,&clilen);
buff[r]=0;
time_t ticks;
ticks = time(NULL);
snprintf(buff,sizeof(buff),"%24s\r\n",ctime(&ticks));
sendto(sfd,buff,sizeof(buff),0,(struct sockaddr*)&cliaddr,sizeof(cliaddr));
exit(0);
return 0;
}

tclient.c

#include "stdio.h"
#include "string.h"
#include "stdlib.h"
#include "sys/socket.h"
#include "sys/types.h"
#include "netinet/in.h"
int main()
{
int listenfd,port,r;
char buff[1024];
struct sockaddr_in servaddr,cliaddr;
socklen_t servlen;
listenfd = socket(AF_INET,SOCK_DGRAM,0);
if(listenfd==-1)
{
perror("Socket");
return 0;
}
memset(servaddr.sin_zero,'\0',sizeof(servaddr.sin_zero));
printf("\n Enter the port no:");
scanf("%d",&port);
printf("\n The port no is:%d",port);
servaddr.sin_family = AF_INET;
servaddr.sin_port = htons(port);
servaddr.sin_addr.s_addr = INADDR_ANY;
sendto(listenfd,buff,sizeof(buff),0,(struct sockaddr*)&servaddr,sizeof(servaddr));
r=recvfrom(listenfd,buff,sizeof(buff),0,(struct sockaddr*)&servaddr,&servlen);
buff[r]=0;
printf("\n The time received from the server:%s",buff);
exit(0);
return 0;
}

Download Source Code

tserver.c

tclient.c