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/* Test long entries and truncated numbers in /etc/networks (bug 32573/32575).
Copyright (C) 2025 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 <netdb.h>
#include <gnu/lib-names.h>
#include <nss.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <support/check.h>
#include <support/check_nss.h>
#include <support/namespace.h>
#include <support/test-driver.h>
#include <support/xdlfcn.h>
#include <support/xunistd.h>
#include <sys/resource.h>
#define STACK_LIM 1048576
#define STRING_SIZE (2 * STACK_LIM)
struct support_chroot *chroot_env;
static void
prepare (int argc, char **argv)
{
int ret;
char *content;
char *entry = malloc (STRING_SIZE);
struct rlimit lim;
getrlimit (RLIMIT_STACK, &lim);
lim.rlim_cur = STACK_LIM;
setrlimit (RLIMIT_STACK, &lim);
if (entry == NULL)
{
puts ("malloc failed, cannot test");
exit (1);
}
memset (entry, 'A', STRING_SIZE);
entry[STRING_SIZE - 1] = 0;
ret = asprintf (&content, "%s\n%s\nnet3 %s\n",
"net1 x0000000000Ff.077", /* legal 255.63.0.0 */
"net2 xFF00000000.0.0.0", /* illegal */
entry /* illegal */);
if (ret == -1)
{
puts ("asprintf failed, cannot test");
exit (1);
}
free (entry);
chroot_env = support_chroot_create
((struct support_chroot_configuration)
{
.networks = content
});
}
static int
do_test (void)
{
support_become_root ();
if (!support_can_chroot ())
return EXIT_UNSUPPORTED;
__nss_configure_lookup ("networks", "files");
xdlopen (LIBNSS_FILES_SO, RTLD_NOW);
xchroot (chroot_env->path_chroot);
check_netent ("net1", getnetbyname ("net1"),
"name: net1\n"
"net: 0xff3f0000\n");
check_netent ("net2", getnetbyname ("net2"), "error: HOST_NOT_FOUND\n");
support_chroot_free (chroot_env);
return 0;
}
#define PREPARE prepare
#include <support/test-driver.c>
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