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/* Basic test for gethostid.
Copyright (C) 2018-2021 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include <gnu/lib-names.h>
#include <nss.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <support/namespace.h>
#include <support/support.h>
#include <support/temp_file.h>
#include <support/xdlfcn.h>
#include <support/xstdio.h>
#include <support/xunistd.h>
#include <unistd.h>
/* Initial test is run outside a chroot, to increase the likelihood of
success. */
static void
outside_chroot (void *closure)
{
long id = gethostid ();
printf ("info: host ID outside chroot: 0x%lx\n", id);
}
/* The same, but this time perform a chroot operation. */
static void
in_chroot (void *closure)
{
const char *chroot_path = closure;
xchroot (chroot_path);
long id = gethostid ();
printf ("info: host ID in chroot: 0x%lx\n", id);
}
static int
do_test (void)
{
support_isolate_in_subprocess (outside_chroot, NULL);
/* Now run the test inside a chroot. */
support_become_root ();
if (!support_can_chroot ())
/* Cannot perform further tests. */
return 0;
/* Only use nss_files. */
__nss_configure_lookup ("hosts", "files");
/* Load the DSO outside of the chroot. */
xdlopen (LIBNSS_FILES_SO, RTLD_LAZY);
char *chroot_dir = support_create_temp_directory ("tst-gethostid-");
support_isolate_in_subprocess (in_chroot, chroot_dir);
/* Tests with /etc/hosts in the chroot. */
{
char *path = xasprintf ("%s/etc", chroot_dir);
add_temp_file (path);
xmkdir (path, 0777);
free (path);
path = xasprintf ("%s/etc/hosts", chroot_dir);
add_temp_file (path);
FILE *fp = xfopen (path, "w");
xfclose (fp);
printf ("info: chroot test with an empty /etc/hosts file\n");
support_isolate_in_subprocess (in_chroot, chroot_dir);
char hostname[1024];
int ret = gethostname (hostname, sizeof (hostname));
if (ret < 0)
printf ("warning: invalid result from gethostname: %d\n", ret);
else if (strlen (hostname) == 0)
puts ("warning: gethostname returned empty string");
else
{
printf ("info: chroot test with IPv6 address in /etc/hosts for: %s\n",
hostname);
fp = xfopen (path, "w");
/* Use an IPv6 address to induce another lookup failure. */
fprintf (fp, "2001:db8::1 %s\n", hostname);
xfclose (fp);
support_isolate_in_subprocess (in_chroot, chroot_dir);
}
free (path);
}
free (chroot_dir);
return 0;
}
#include <support/test-driver.c>
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