00001 #include <sys/types.h>
00002 #include <sys/socket.h>
00003 #include <netinet/in.h>
00004 #include <netdb.h>
00005 #include <stdio.h>
00006 #include <stdlib.h>
00007 #include <arpa/inet.h>
00008 
00009 void print_hostent_info(struct hostent * hp); //  cf listing /*@\ref{network::hostent}@*/
00010 
00011 int main( int argc, char* argv[]) 
00012 {
00013     extern int h_errno;
00014     struct hostent* hp;
00015     if ( argc != 2) {
00016         fprintf(stderr, "Usage: %s <host_name>|<host_addr>\n",argv[0]);
00017         return EXIT_FAILURE;
00018     }
00019     if (( hp = gethostbyname(argv[1])) == NULL) {
00020         fprintf(stderr, "[Erreur] gethostbyname : %s\n", hstrerror(h_errno));
00021         return EXIT_FAILURE;
00022     }
00023     print_hostent_info(hp);
00024     return EXIT_SUCCESS;
00025 }
00026 
00027 void print_hostent_info(struct hostent * hp) {
00028     unsigned int i,j;
00029 
00030          // Gestion du champ hp->h_name (nom officiel de l'hôte)
00031     printf("Champ h_name     : %s\n",
00032            (hp->h_name == NULL)?"NULL":hp->h_name);
00033          // Gestion du champ hp->h_aliases (liste d'alias)
00034     if (hp->h_aliases != NULL && *hp->h_aliases != NULL) {
00035         i = 0;
00036         printf( "Champ h_aliases  :");
00037         do {
00038             printf( " %s", hp->h_aliases[i]);
00039             i++;
00040         } while (hp->h_aliases[i] != NULL);
00041         printf("\n");
00042     }
00043          // Gestion du champ hp->h_addrtype (type d'adresse)
00044     printf( "Champ h_addrtype : %d (%s)\n",
00045             hp->h_addrtype, 
00046             (hp->h_addrtype == AF_INET)?"AF_INET":"!AF_INET");
00047          // Gestion du champ hp->h_length (longueur d'adresse- 4 pour IPv4)
00048     printf( "Champ h_length   : %d\n", hp->h_length);
00049          // Gestion du champ hp->h_addr_list (liste des adresses renvoyées)
00050     printf( "Champ h_addr_list: \n");
00051     for( i = 0 ; hp->h_addr_list[i] != NULL; i++) {
00052         printf("  [%d] ",i);
00053         for ( j = 0; j < hp->h_length; j++) 
00054             printf( "%02x", hp->h_addr_list[i][j]);
00055         printf( "(%s)\n", inet_ntoa( * (struct in_addr *)( hp->h_addr_list[i]) ));
00056     }
00057 }