inet/test_ifindex.c

   1 /* Test interface name <-> index conversions.
   2    Copyright (C) 1997, 2000 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, write to the Free
  18    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  19    02111-1307 USA.  */
  20
  21 #include <errno.h>
  22 #include <stdio.h>
  23 #include <stdlib.h>
  24 #include <string.h>
  25 #include <net/if.h>
  26
  27 int
  28 main (void)
  29 {
  30   int failures = 0;
  31   struct if_nameindex *idx = if_nameindex (), *p;
  32   if (idx == NULL)
  33     {
  34       if (errno != ENOSYS)
  35         {
  36           printf ("Couldn't get any interfaces.\n");
  37           exit (1);
  38         }
  39       /* The function is simply not implemented.  */
  40       exit (0);
  41     }
  42
  43   printf ("Idx            Name | Idx           Name\n");
  44
  45   for (p = idx; p->if_index || p->if_name; ++p)
  46     {
  47       char buf[IFNAMSIZ];
  48       unsigned int ni;
  49       int result;
  50       printf ("%3d %15s | ", p->if_index, p->if_name);
  51       printf ("%3d", ni = if_nametoindex (p->if_name));
  52       printf ("%15s", if_indextoname (p->if_index, buf));
  53       result = (ni != p->if_index || (strcmp (buf, p->if_name)));
  54       if (ni == p->if_index)
  55         /* We have to make sure that this is not an alias with the
  56            same interface number.  */
  57         if (p->if_index == if_nametoindex (buf))
  58           result = 0;
  59       printf ("%10s", result ? "fail" : "okay");
  60       printf ("\n");
  61       failures += result;
  62     }
  63   if_freenameindex (idx);
  64   return failures ? 1 : 0;
  65 }