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109 lines
3.2 KiB
C
109 lines
3.2 KiB
C
/* Basic test for gethostid.
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Copyright (C) 2018-2025 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <gnu/lib-names.h>
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#include <nss.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <support/namespace.h>
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#include <support/support.h>
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#include <support/temp_file.h>
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#include <support/xdlfcn.h>
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#include <support/xstdio.h>
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#include <support/xunistd.h>
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#include <unistd.h>
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/* Initial test is run outside a chroot, to increase the likelihood of
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success. */
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static void
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outside_chroot (void *closure)
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{
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long id = gethostid ();
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printf ("info: host ID outside chroot: 0x%lx\n", id);
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}
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/* The same, but this time perform a chroot operation. */
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static void
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in_chroot (void *closure)
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{
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const char *chroot_path = closure;
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xchroot (chroot_path);
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long id = gethostid ();
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printf ("info: host ID in chroot: 0x%lx\n", id);
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}
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static int
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do_test (void)
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{
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support_isolate_in_subprocess (outside_chroot, NULL);
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/* Now run the test inside a chroot. */
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support_become_root ();
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if (!support_can_chroot ())
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/* Cannot perform further tests. */
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return 0;
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/* Only use nss_files. */
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__nss_configure_lookup ("hosts", "files");
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/* Load the DSO outside of the chroot. */
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xdlopen (LIBNSS_FILES_SO, RTLD_LAZY);
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char *chroot_dir = support_create_temp_directory ("tst-gethostid-");
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support_isolate_in_subprocess (in_chroot, chroot_dir);
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/* Tests with /etc/hosts in the chroot. */
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{
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char *path = xasprintf ("%s/etc", chroot_dir);
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add_temp_file (path);
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xmkdir (path, 0777);
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free (path);
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path = xasprintf ("%s/etc/hosts", chroot_dir);
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add_temp_file (path);
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FILE *fp = xfopen (path, "w");
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xfclose (fp);
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printf ("info: chroot test with an empty /etc/hosts file\n");
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support_isolate_in_subprocess (in_chroot, chroot_dir);
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char hostname[1024];
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int ret = gethostname (hostname, sizeof (hostname));
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if (ret < 0)
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printf ("warning: invalid result from gethostname: %d\n", ret);
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else if (strlen (hostname) == 0)
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puts ("warning: gethostname returned empty string");
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else
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{
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printf ("info: chroot test with IPv6 address in /etc/hosts for: %s\n",
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hostname);
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fp = xfopen (path, "w");
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/* Use an IPv6 address to induce another lookup failure. */
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fprintf (fp, "2001:db8::1 %s\n", hostname);
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xfclose (fp);
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support_isolate_in_subprocess (in_chroot, chroot_dir);
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}
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free (path);
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}
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free (chroot_dir);
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return 0;
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}
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#include <support/test-driver.c>
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