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db9a8ad4 | 1 | /* Basic test for gethostid. |
2b778ceb | 2 | Copyright (C) 2018-2021 Free Software Foundation, Inc. |
db9a8ad4 FW |
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 | |
5a82c748 | 17 | <https://www.gnu.org/licenses/>. */ |
db9a8ad4 FW |
18 | |
19 | #include <gnu/lib-names.h> | |
20 | #include <nss.h> | |
21 | #include <stdio.h> | |
22 | #include <stdlib.h> | |
23 | #include <string.h> | |
24 | #include <support/namespace.h> | |
25 | #include <support/support.h> | |
26 | #include <support/temp_file.h> | |
27 | #include <support/xdlfcn.h> | |
28 | #include <support/xstdio.h> | |
29 | #include <support/xunistd.h> | |
30 | #include <unistd.h> | |
31 | ||
32 | /* Initial test is run outside a chroot, to increase the likelihood of | |
33 | success. */ | |
34 | static void | |
35 | outside_chroot (void *closure) | |
36 | { | |
37 | long id = gethostid (); | |
38 | printf ("info: host ID outside chroot: 0x%lx\n", id); | |
39 | } | |
40 | ||
41 | /* The same, but this time perform a chroot operation. */ | |
42 | static void | |
43 | in_chroot (void *closure) | |
44 | { | |
45 | const char *chroot_path = closure; | |
46 | xchroot (chroot_path); | |
47 | long id = gethostid (); | |
48 | printf ("info: host ID in chroot: 0x%lx\n", id); | |
49 | } | |
50 | ||
51 | static int | |
52 | do_test (void) | |
53 | { | |
54 | support_isolate_in_subprocess (outside_chroot, NULL); | |
55 | ||
56 | /* Now run the test inside a chroot. */ | |
57 | support_become_root (); | |
58 | if (!support_can_chroot ()) | |
59 | /* Cannot perform further tests. */ | |
60 | return 0; | |
61 | ||
62 | /* Only use nss_files. */ | |
63 | __nss_configure_lookup ("hosts", "files"); | |
64 | ||
65 | /* Load the DSO outside of the chroot. */ | |
66 | xdlopen (LIBNSS_FILES_SO, RTLD_LAZY); | |
67 | ||
68 | char *chroot_dir = support_create_temp_directory ("tst-gethostid-"); | |
69 | support_isolate_in_subprocess (in_chroot, chroot_dir); | |
70 | ||
71 | /* Tests with /etc/hosts in the chroot. */ | |
72 | { | |
73 | char *path = xasprintf ("%s/etc", chroot_dir); | |
74 | add_temp_file (path); | |
75 | xmkdir (path, 0777); | |
76 | free (path); | |
77 | path = xasprintf ("%s/etc/hosts", chroot_dir); | |
78 | add_temp_file (path); | |
79 | ||
80 | FILE *fp = xfopen (path, "w"); | |
81 | xfclose (fp); | |
82 | printf ("info: chroot test with an empty /etc/hosts file\n"); | |
83 | support_isolate_in_subprocess (in_chroot, chroot_dir); | |
84 | ||
85 | char hostname[1024]; | |
86 | int ret = gethostname (hostname, sizeof (hostname)); | |
87 | if (ret < 0) | |
88 | printf ("warning: invalid result from gethostname: %d\n", ret); | |
89 | else if (strlen (hostname) == 0) | |
90 | puts ("warning: gethostname returned empty string"); | |
91 | else | |
92 | { | |
93 | printf ("info: chroot test with IPv6 address in /etc/hosts for: %s\n", | |
94 | hostname); | |
95 | fp = xfopen (path, "w"); | |
96 | /* Use an IPv6 address to induce another lookup failure. */ | |
97 | fprintf (fp, "2001:db8::1 %s\n", hostname); | |
98 | xfclose (fp); | |
99 | support_isolate_in_subprocess (in_chroot, chroot_dir); | |
100 | } | |
101 | free (path); | |
102 | } | |
103 | free (chroot_dir); | |
104 | ||
105 | return 0; | |
106 | } | |
107 | ||
108 | #include <support/test-driver.c> |