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
main(int argc,char ** argv)36 int 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