/*
** modul_nadawczy.c -- datagram
** Piotr Niemojewski - -///- (R)
** wykonano na laboratorium QNX
** temat Komunikator Sieciowy
** v1.16
*/

#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 

int main(int argc, char *argv[])
{
   int sockfd;
   int PORT; /* ustalamy na ktorym porcie jest polaczenie */
		
   printf("Wpisz tresc wiadomosci. Koniec programu = Ctrl+Cnn");

   for(;;)
   {
      char tresc[255];
      struct sockaddr_in their_addr; /* adres lacznika */
      struct hostent *he;
	    
      int numbytes;
	    
     if (argc != 3) 
     {
        fprintf(stderr,"uzycie: %s nazwa_komputeranumer_portun",argv[0]);
        exit(1);
     }

      PORT = atoi(argv[2]);
		
      if ((he=gethostbyname(argv[1])) == NULL) 
      {
  	/* dns */
 	      
         perror("Nie moge odnalezc komputera");
         exit(1);
      }

      if ((sockfd = socket(AF_INET, SOCK_DGRAM, 0)) == -1) 
      {
          perror("socket");
          exit(1);
      }
      their_addr.sin_family = AF_INET;         /* host byte order */
      their_addr.sin_port = htons(PORT);     /* short, network byte order */
      their_addr.sin_addr = *((struct in_addr *)he->h_addr);
      bzero(&(their_addr.sin_zero), 8);
        			
	/* zero the rest of the struct */
      printf(">");

      scanf("%s",&tresc);
      printf("n");
 	
      if ((numbytes=sendto(sockfd,tresc,strlen(tresc),0,(struct sockaddr *)&their_addr, sizeof(struct sockaddr))) == -1) 
      {
          perror("recvfrom");
          exit(1);
      }
		
      printf("Wyslano na %s /Koniec = Ctrl+C/nn",inet_ntoa(their_addr.sin_addr));
      close(sockfd);
   }
   return 0;
}