/* Modifikation unseres Timeservers,
 * 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 <sys/time.h>
#include <time.h>
#include <unistd.h>
#include <stdlib.h>
#define SERVPORT   11011
#define MAXLINE 256

int main() { 
   struct sockaddr_in addr, client_addr;
   size_t client_addr_len = sizeof(client_addr);
   char recvline[MAXLINE];
   int sfd;

   memset(&addr, 0, sizeof(addr));   // mit 0en fuellen

   addr.sin_family = AF_INET;   // UDP-Verbindung
   addr.sin_port = htons(SERVPORT);// Port eintragen, Network Byte Order
   addr.sin_addr.s_addr = htonl(INADDR_ANY);

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

   if (bind(sfd, (struct sockaddr *) &addr, sizeof(addr)) <0)
       perror("bind"), exit(2);

   while (1) {
      if ( (recvfrom(sfd, recvline,MAXLINE,0,
                 (struct sockaddr *) &client_addr, & client_addr_len)) < 0) {
         perror("Server -- recfrom"); exit(3);
      }
      time_t clock; char *tbuf;
      time(&clock);      // aktuelle Uhrzeit holen
      tbuf = ctime(&clock);   // in String schreiben
      if (sendto(sfd, tbuf, strlen(tbuf),0, (struct sockaddr *) & client_addr,
              sizeof(client_addr)) < strlen(tbuf) ) {
          perror("Server -- sendto"); exit(4);
      }
   }
   exit(0);         // seldomly reached
}