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

/* Port fuer die Requests */
#define PORT 7777

/* Puffergroesse */
#define BUFSIZE 16384

int main(int argc, char **argv)
  {
  int sockfd;
  struct sockaddr_in remote_addr;
  struct hostent *host_addr;

  if (argc != 3)
    {
    fprintf(stderr, "Usage: %s <HOST> <MESSAGE>\n", argv[0]);
    }

  if ((host_addr = gethostbyname(argv[1])) == NULL)
    {
    fprintf(stderr, "Cannot resolv hostname: %s\n", argv[1]);
    exit(1);
    }

  if ((sockfd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP)) < 0)
    {
    fprintf(stderr, "Error: socket()\n");
    exit(1);
    }

  bzero((char *) &remote_addr, sizeof(remote_addr));
  remote_addr.sin_family = AF_INET;
  remote_addr.sin_addr   = *((struct in_addr *) host_addr->h_addr);
  remote_addr.sin_port   = htons(PORT);

  if (sendto(sockfd, argv[2], strlen(argv[2]) + 1, 0,
	     (struct sockaddr *)&remote_addr, sizeof(remote_addr)) > 0)
    {
    printf("Message sent\n");
    } 
  else
    {
    fprintf(stderr, "Error while sending data\n");
    }
  close(sockfd);
  return(0);
  }