diff options
Diffstat (limited to 'misc')
| -rw-r--r-- | misc/Makefile | 7 | ||||
| -rw-r--r-- | misc/tst-gethostid.c | 108 |
2 files changed, 115 insertions, 0 deletions
diff --git a/misc/Makefile b/misc/Makefile index 9a87e81ae5..30e0673c8a 100644 --- a/misc/Makefile +++ b/misc/Makefile @@ -86,6 +86,11 @@ tests := tst-dirname tst-tsearch tst-fdset tst-efgcvt tst-mntent tst-hsearch \ tst-preadvwritev tst-preadvwritev64 tst-makedev tst-empty \ tst-preadvwritev2 tst-preadvwritev64v2 tst-warn-wide +# Tests which need libdl. +ifeq (yes,$(build-shared)) +tests += tst-gethostid +endif + tests-internal := tst-atomic tst-atomic-long tst-allocate_once tests-static := tst-empty @@ -145,3 +150,5 @@ tst-allocate_once-ENV = MALLOC_TRACE=$(objpfx)tst-allocate_once.mtrace $(objpfx)tst-allocate_once-mem.out: $(objpfx)tst-allocate_once.out $(common-objpfx)malloc/mtrace $(objpfx)tst-allocate_once.mtrace > $@; \ $(evaluate-test) + +$(objpfx)tst-gethostid: $(libdl) diff --git a/misc/tst-gethostid.c b/misc/tst-gethostid.c new file mode 100644 index 0000000000..1490aaf3f5 --- /dev/null +++ b/misc/tst-gethostid.c @@ -0,0 +1,108 @@ +/* Basic test for gethostid. + Copyright (C) 2018 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 + <http://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> |