/* Modifikation unseres Time-Clients -- nur zur
 * Demo, so nicht sinnvoll
 */

#include <netdb.h>
#include <netinet/in.h>
#include <stdio.h>
#include <strings.h>
#include <string.h>
#include <sys/socket.h>
#include <unistd.h>
#include <stdlib.h>
# include <arpa/inet.h>

#define SERVPORT    11011
#define CLIPORT    11012

int main(int argc, char **argv)
{    struct sockaddr_in serv_addr, cli_addr;
    struct hostent *hp;
    int fd;
    int n;
    char buf[BUFSIZ];

    if (argc!=2)
        printf("usage: %s hostname\n", argv[0]),
        exit(1);

    if (!(hp = gethostbyname(argv[1])))    // IP-Adresse des Servers holen
        fprintf(stderr, "unknown host: %s\n", argv[1]),
        exit(1);

    memset(&serv_addr,0, sizeof(serv_addr));    // mit 0en fuellen
    serv_addr.sin_family = AF_INET;    // TCP/IP-Verbindung
    serv_addr.sin_port = htons(SERVPORT);// Port eintragen, Network Byte Order
                    // Serveraddresse eintragen
    memcpy(&serv_addr.sin_addr.s_addr,hp->h_addr, hp->h_length); 
    
    memset(&cli_addr,0, sizeof(cli_addr));    // mit 0en fuellen
    cli_addr.sin_family = AF_INET;    // TCP/IP-Verbindung
    cli_addr.sin_port = htons(0);// Port eintragen, Network Byte Order
    cli_addr.sin_addr.s_addr = htonl(INADDR_ANY);


    if ((fd = socket(AF_INET, SOCK_DGRAM, 0)) <0)
         perror("socket"),    // Socket erzeugen
        exit(1);


    if (bind(fd, (struct sockaddr *) &cli_addr, sizeof(cli_addr)) <0)
        perror("bind"),    // lokale Adresse binden
        exit(1);        

     if ( sendto(fd, "TIME", 5, 0, (struct sockaddr *) & serv_addr,
          sizeof(serv_addr)) < 0) {
        perror("Client: sendto"); exit(2);
     }

     shutdown(fd,1);

     if (( n = recvfrom(fd, buf, sizeof(buf),0, (struct sockaddr *) 0,
           (int *) 0)) < 0 ) {
        perror("Client: recvfrom"); exit(3);
     }
     buf[n] = '\0';
     printf("%.*s", n, buf);

    close(fd);
    exit(0);
}