/* Client program for Internet UDP sockets */
/* From the book of Haviland, pp. 270 - 271, modified */
/* Read more explanation in this book */
/* Client assumes that the server has  */
/* IP addr = 194.27.78.02   and port = 7000 */
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <netdb.h>
#include <arpa/inet.h>
#include <ctype.h>

#define PORT  7000 /* Port of this server */
#define SIZE sizeof(struct sockaddr_in)

int
main(void)
{
    char buf[1024];
    int n, s, ns, len;
    struct sockaddr_in cli = {AF_INET, INADDR_ANY, INADDR_ANY};
    struct sockaddr_in srv = {AF_INET, PORT}; /* For server's address */
     
    printf("CLIENT: starting ...\n");

    /* Convert and store IP address of the server: 194.27.78.05 (mesarya) */
    srv.sin_addr.s_addr = inet_addr("194.27.78.02");

    /*
     * Create the Internet socket, of SOCK_DGRAM type.
     */
    if ((s = socket(AF_INET, SOCK_DGRAM, 0)) < 0) 
        {
        perror("socket problem");
        exit(1);
        }


    /*
     * For simplicity, use the IP address as the OS selects.
     * It is more preferable to set a specific IP address
     * which must be known to all clients...
     */


    /*
     * Bind the socket to the the IP address of this host.
     */
    if (bind(s, (struct sockaddr *) &cli, SIZE) < 0) 
        {
        perror("bind problem");
        exit(1);
        }


    /*
     * Send a message to the socket s
     */
    n = sendto(s, "This is a request from client\n", 30, 0, 
               (struct sockaddr*)&srv, SIZE);
    if (n < 0) {perror("sendto problem"); exit(1);}

    
    printf ("CLIENT: sent a request...\n");
    
    /*
     * Close the socket and terminate.
     */

    close(s);
    printf ("... and terminated\n");
    exit(0);
}