/**********************  Code below shows that on some  ********************/
/**********************  machines the array of address  ********************/
/**********************  pointers is a struct in_addr   ********************/
/**********************  on some architectures like SGI.********************/

#define MAXBUF 256       /*****  Demo of Important Functions  *****/
#include <sys/types.h>
#include <sys/socket.h>  /* for AF_INET constant */
#include <netdb.h>       /* for struct hostent   */
#include <netinet/in.h>  /* For struct in_addr */
#include <arpa/inet.h>   /* for inet_ntoa()    */
#include <stdio.h>
/* struct in_addr{ unsigned long s_addr}; */
main()
{
  struct hostent *hptr;
  char **ch_ptr, buf[100];
  struct in_addr **inaddr_ptr;
  struct sockaddr_in server;  
  int active;

  hptr = gethostbyname("columbia.atc.fhda.edu"); /* Get a hostent structure
                                                          from challenger */
  printf("h_name component is %s\n", hptr->h_name);
  ch_ptr = hptr->h_aliases;
  while (*ch_ptr)
  {
     printf("h_aliases list: %s\n", *ch_ptr);
     ch_ptr++;
  }
  
  inaddr_ptr = (struct in_addr **) hptr->h_addr_list;  
  while (*inaddr_ptr != NULL)
  {
     printf("h_addr_list raw: %lu\n", (*inaddr_ptr)->s_addr); 
     printf("h_addr_list: %s\n", inet_ntoa(**inaddr_ptr));
     inaddr_ptr++;
  }

  memset(&server, 0, sizeof(struct sockaddr_in));
  server.sin_family = AF_INET;
  server.sin_port   = htons(13);    /****  Daytime server port number  ****/

  /*********  IPv4 Conversion Functions  ***********/ 
  server.sin_addr.s_addr =  inet_addr("153.18.200.6");  /****  Deprecated! ****/
  printf("raw address is: %lu\n", server.sin_addr.s_addr);
  inet_aton("153.18.200.6", &server.sin_addr); 
  printf("raw address is: %lu\n", server.sin_addr.s_addr);

  if ((active = socket(AF_INET, SOCK_STREAM, 0)) < 0)
  {
      perror("Socket");
      exit(1);
  }
  if (connect(active, (struct sockaddr *) &server, sizeof(server)) < 0)
  {
      perror("Connect");
      exit(2);
  }
  write(active, "Hello", 5);
  memset(buf, 0, 10);
  read(active, buf, 100);  
  printf("Received \"%s\" from server.\n", buf);
}
/**************************  Program Output Below  ***************************/

h_name component is columbia.atc.fhda.edu
h_addr_list raw: 2568144904
h_addr_list: 153.18.200.8
raw address is: 2568144902
raw address is: 2568144902
Received "Wed Apr 12 14:58:40 2000
" from server.