1 /* Test host lookup with double dots at the end, [BZ #16469].
2 Copyright (C) 2014-2022 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
9
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
14
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <https://www.gnu.org/licenses/>. */
18
19 #include <sys/types.h>
20 #include <sys/socket.h>
21 #include <netdb.h>
22 #include <stdio.h>
23 #include <string.h>
24
25 static int
test(void)26 test (void)
27 {
28 static char host1[] = "localhost..";
29 static char host2[] = "www.gnu.org..";
30 static char *hosts[] = { host1, host2 };
31 int i;
32 int pass = 0;
33
34 for (i = 0; i < sizeof (hosts) / sizeof (*hosts); i++)
35 {
36 char *host = hosts[i];
37 size_t len = strlen (host);
38 struct addrinfo *ai;
39
40 /* If the name doesn't resolve with a single dot at the
41 end, skip it. */
42 host[len-1] = 0;
43 if (getaddrinfo (host, NULL, NULL, &ai) != 0)
44 {
45 printf ("resolving \"%s\" failed, skipping this hostname\n", host);
46 continue;
47 }
48 printf ("resolving \"%s\" worked, proceeding to test\n", host);
49 freeaddrinfo (ai);
50
51 /* If it resolved with a single dot, check that it doesn't with
52 a second trailing dot. */
53 host[len-1] = '.';
54 if (getaddrinfo (host, NULL, NULL, &ai) == 0)
55 {
56 printf ("resolving \"%s\" worked, test failed\n", host);
57 return 1;
58 }
59 printf ("resolving \"%s\" failed, test passed\n", host);
60 pass = 1;
61 }
62
63 /* We want at least one successful name resolution for the test to
64 succeed. */
65 return pass ? 0 : 2;
66 }
67
68 #define TEST_FUNCTION test ()
69 #include "../test-skeleton.c"
70