/* Check for descriptor leak in if_nametoindex with a long interface name.

   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/>.  */

/* This test checks for a descriptor leak in case of a long interface

   name (CVE-2018-19591, bug 23927).  */

#include <errno.h>

#include <net/if.h>

#include <netdb.h>

#include <string.h>

#include <support/check.h>

#include <support/descriptors.h>

#include <support/support.h>

static int

do_test (void)

{

  struct support_descriptors *descrs = support_descriptors_list ();

  /* Prepare a name which is just as long as required for trigging the

     bug.  */

  char name[IFNAMSIZ + 1];

  memset (name, 'A', IFNAMSIZ);

  name[IFNAMSIZ] = '\0';

  TEST_COMPARE (strlen (name), IFNAMSIZ);

  struct ifreq ifr;

  TEST_COMPARE (strlen (name), sizeof (ifr.ifr_name));

  /* Test directly via if_nametoindex.  */

  TEST_COMPARE (if_nametoindex (name), 0);

  TEST_COMPARE (errno, ENODEV);

  support_descriptors_check (descrs);

  /* Same test via getaddrinfo.  */

  char *host = xasprintf ("fea0::%%%s", name);

  struct addrinfo hints = { .ai_flags = AI_NUMERICHOST, };

  struct addrinfo *ai;

  TEST_COMPARE (getaddrinfo (host, NULL, &hints, &ai), EAI_NONAME);

  support_descriptors_check (descrs);

  support_descriptors_free (descrs);

  return 0;

}

#include <support/test-driver.c>