inet/test_ifindex.c

   1 /* Test interface name <-> index conversions.
   2    Copyright (C) 1997-2019 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4    Contributed by Philip Blundell <Philip.Blundell@pobox.com>.
   5
   6    The GNU C Library is free software; you can redistribute it and/or
   7    modify it under the terms of the GNU Lesser General Public
   8    License as published by the Free Software Foundation; either
   9    version 2.1 of the License, or (at your option) any later version.
  10
  11    The GNU C Library is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14    Lesser General Public License for more details.
  15
  16    You should have received a copy of the GNU Lesser General Public
  17    License along with the GNU C Library; if not, see
  18    <http://www.gnu.org/licenses/>.  */
  19
  20 #include <errno.h>
  21 #include <stdio.h>
  22 #include <stdlib.h>
  23 #include <string.h>
  24 #include <net/if.h>
  25
  26 static int
  27 do_test (void)
  28 {
  29   int failures = 0;
  30   struct if_nameindex *idx = if_nameindex (), *p;
  31   if (idx == NULL)
  32     {
  33       if (errno != ENOSYS)
  34         {
  35           printf ("Couldn't get any interfaces.\n");
  36           exit (1);
  37         }
  38       /* The function is simply not implemented.  */
  39       exit (0);
  40     }
  41
  42   printf ("Idx            Name | Idx           Name\n");
  43
  44   for (p = idx; p->if_index || p->if_name; ++p)
  45     {
  46       char buf[IFNAMSIZ];
  47       unsigned int ni;
  48       int result;
  49       printf ("%3d %15s | ", p->if_index, p->if_name);
  50       printf ("%3d", ni = if_nametoindex (p->if_name));
  51       printf ("%15s", if_indextoname (p->if_index, buf));
  52       result = (ni != p->if_index || (strcmp (buf, p->if_name)));
  53       if (ni == p->if_index)
  54         /* We have to make sure that this is not an alias with the
  55            same interface number.  */
  56         if (p->if_index == if_nametoindex (buf))
  57           result = 0;
  58       printf ("%10s", result ? "fail" : "okay");
  59       printf ("\n");
  60       failures += result;
  61     }
  62   if_freenameindex (idx);
  63   return failures ? 1 : 0;
  64 }
  65
  66 #define TEST_FUNCTION do_test ()
  67 #include "../test-skeleton.c"