Write a program for client server using point to point connection.

Aim :Write a program for client  server using point to point connection.

Client 
   
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
 #include <string.h>
 #include <sys/types.h>
 #include <sys/socket.h>
 #include <netinet/in.h>
 #include <arpa/inet.h>
 #include <netdb.h>
    /* the port users will be connecting to */
    #define MYPORT 8888
    int main(int argc, char *argv[ ])
    {
    int sockfd;
   /* connector’s address information */
    struct sockaddr_in their_addr;
    struct hostent *he;
    int numbytes;
    /*i get the host info */
    he = gethostbyname(argv[1]);
        sockfd = socket(AF_INET, SOCK_DGRAM, 0);
    /* host byte order */
    their_addr.sin_family = AF_INET;
    /* short, network byte order */
    printf("Using port: 8888\n");
    their_addr.sin_port = htons(MYPORT);
    their_addr.sin_addr = *((struct in_addr *)he->h_addr);
    /* zero the rest of the struct */
    memset(&(their_addr.sin_zero), '\0', 8);
    numbytes = sendto(sockfd, argv[2], strlen(argv[2]), 0, (struct sockaddr *)&their_addr,                sizeof(struct sockaddr));
if (close(sockfd) != 0)
printf("Your Messege is not sent...sorry\n");
else
printf("Your Messege is successfully sent.\n");
    return 0;
    }



Server

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#define MYPORT 8888
#define MAXBUFLEN 500
int main(int argc, char *argv[])
{
     int sockfd;
    /* my address information */
     struct sockaddr_in my_addr;
   /* connector’s address information */
     struct sockaddr_in their_addr;
     int addr_len, numbytes;
     char buf[MAXBUFLEN];
     sockfd = socket(AF_INET, SOCK_DGRAM, 0);
     printf("Server-socket() sockfd is OK...\n");
    /* host byte order */
     my_addr.sin_family = AF_INET;
   /* short, network byte order */
     my_addr.sin_port = htons(MYPORT);
   /* automatically fill with my IP */
    my_addr.sin_addr.s_addr = INADDR_ANY;
   /* zero the rest of the struct */
    memset(&(my_addr.sin_zero), '\0', 8);
    bind(sockfd, (struct sockaddr *)&my_addr, sizeof(struct sockaddr));
    addr_len = sizeof(struct sockaddr);
     numbytes = recvfrom(sockfd, buf, MAXBUFLEN-1, 0, (struct sockaddr *)&their_addr,   &addr_len);
     buf[numbytes] = '\0';
printf("THIS MSG SEND BY  CLIENT TO SERVER ::> \"%s\"\n", buf);
 close(sockfd);
 return 0;
 }