test_gethostbyname.c revision 133a37ede3e955093c6004d94496e2cdc2cc1264 
1/*
2 * Copyright (C) 2008 The Android Open Source Project
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 *  * Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 *  * Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in
12 *    the documentation and/or other materials provided with the
13 *    distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
16 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
17 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
18 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
19 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
21 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
22 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
23 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
24 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
25 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28#define _GNU_SOURCE 1
29#include <unistd.h>
30#include <errno.h>
31#include <string.h>
32#include <stdio.h>
33#include <sys/types.h>
34#include <netdb.h>
35
36int  main( int  argc, char**  argv )
37{
38    char*            hostname = "localhost";
39    struct hostent*  hent;
40    int    i, ret;
41
42    if (argc > 1)
43        hostname = argv[1];
44
45    hent = gethostbyname(hostname);
46    if (hent == NULL) {
47        printf("gethostbyname(%s) returned NULL !!\n", hostname);
48        return 1;
49    }
50    printf( "gethostbyname(%s) returned:\n", hostname);
51    printf( "  name: %s\n", hent->h_name );
52    printf( "  aliases:" );
53    for (i = 0; hent->h_aliases[i] != NULL; i++)
54        printf( " %s", hent->h_aliases[i] );
55    printf( "\n" );
56    printf( "  address type: " );
57    switch (hent->h_addrtype) {
58        case AF_INET:  printf( "AF_INET\n"); break;
59        case AF_INET6: printf( "AF_INET6\n"); break;
60        default: printf("UNKNOWN (%d)\n", hent->h_addrtype);
61    }
62    printf( "  address: " );
63    switch (hent->h_addrtype) {
64        case AF_INET:
65            {
66                const char*  dot = "";
67                for (i = 0; i < hent->h_length; i++) {
68                    printf("%s%d", dot, ((unsigned char*)hent->h_addr)[i]);
69                    dot = ".";
70                }
71            }
72            break;
73
74        default:
75            for (i = 0; i < hent->h_length; i++) {
76                printf( "%02x", ((unsigned char*)hent->h_addr)[i] );
77            }
78    }
79    printf("\n");
80    return 0;
81}
82