inet/test_ifindex.c

   1 /* Test interface name <-> index conversions.
   2    Copyright (C) 1997-2023 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <https://www.gnu.org/licenses/>.  */
  18
  19 #include <errno.h>
  20 #include <stdio.h>
  21 #include <stdlib.h>
  22 #include <string.h>
  23 #include <net/if.h>
  24
  25 static int
  26 do_test (void)
  27 {
  28   int failures = 0;
  29   struct if_nameindex *idx = if_nameindex (), *p;
  30   if (idx == NULL)
  31     {
  32       if (errno != ENOSYS)
  33         {
  34           printf ("Couldn't get any interfaces.\n");
  35           exit (1);
  36         }
  37       /* The function is simply not implemented.  */
  38       exit (0);
  39     }
  40
  41   printf ("Idx            Name | Idx           Name\n");
  42
  43   for (p = idx; p->if_index || p->if_name; ++p)
  44     {
  45       char buf[IFNAMSIZ];
  46       unsigned int ni;
  47       int result;
  48       printf ("%3d %15s | ", p->if_index, p->if_name);
  49       printf ("%3d", ni = if_nametoindex (p->if_name));
  50       printf ("%15s", if_indextoname (p->if_index, buf));
  51       result = (ni != p->if_index || (strcmp (buf, p->if_name)));
  52       if (ni == p->if_index)
  53         /* We have to make sure that this is not an alias with the
  54            same interface number.  */
  55         if (p->if_index == if_nametoindex (buf))
  56           result = 0;
  57       printf ("%10s", result ? "fail" : "okay");
  58       printf ("\n");
  59       failures += result;
  60     }
  61   if_freenameindex (idx);
  62   return failures ? 1 : 0;
  63 }
  64
  65 #define TEST_FUNCTION do_test ()
  66 #include "../test-skeleton.c"