tests/test-net_if.c

   1 /* Test of <net/if.h> functions.
   2    Copyright (C) 2010-2024 Free Software Foundation, Inc.
   3
   4    This program is free software: you can redistribute it and/or modify
   5    it under the terms of the GNU General Public License as published by
   6    the Free Software Foundation, either version 3 of the License, or
   7    (at your option) any later version.
   8
   9    This program is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12    GNU General Public License for more details.
  13
  14    You should have received a copy of the GNU General Public License
  15    along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
  16
  17 /* Written by Simon Josefsson <simon@josefsson.org>, 2010.  */
  18
  19 #include <config.h>
  20
  21 #include <net/if.h>
  22
  23 /* We do not yet have replacements for if_* functions on systems that
  24    lack a native <net/if.h>.  */
  25 #if HAVE_NET_IF_H && HAVE_IF_NAMEINDEX
  26 # include "signature.h"
  27 SIGNATURE_CHECK (if_freenameindex, void, (struct if_nameindex *));
  28 SIGNATURE_CHECK (if_indextoname, char *, (unsigned int, char *));
  29 SIGNATURE_CHECK (if_nameindex, struct if_nameindex *, (void));
  30 SIGNATURE_CHECK (if_nametoindex, unsigned int, (const char *));
  31 #endif
  32
  33 #include <stddef.h> /* NULL */
  34 #include <stdio.h> /* fprintf */
  35 #include <string.h> /* strcmp */
  36
  37 int
  38 main (int argc, char *argv[])
  39 {
  40 #if HAVE_NET_IF_H && HAVE_IF_NAMEINDEX
  41   struct if_nameindex *ifnp, *p;
  42
  43   p = ifnp = if_nameindex ();
  44   if (ifnp == NULL)
  45     {
  46       fputs ("if_nameindex returned NULL\n", stderr);
  47       return 1;
  48     }
  49
  50   while (p->if_index)
  51     {
  52       unsigned int idx;
  53       char buf[IF_NAMESIZE];
  54       char *q;
  55
  56       if (argc > 1)
  57         printf ("index %d name %s\n", p->if_index, p->if_name);
  58
  59       idx = if_nametoindex (p->if_name);
  60       if (idx != p->if_index)
  61         {
  62           fprintf (stderr, "if_nametoindex (%s) = %d != %d\n",
  63                    p->if_name, idx, p->if_index);
  64           return 1;
  65         }
  66
  67       q = if_indextoname (p->if_index, buf);
  68       if (q == NULL)
  69         {
  70           fprintf (stderr, "if_indextoname (%d) returned NULL\n", p->if_index);
  71           return 1;
  72         }
  73       if (q != buf)
  74         {
  75           fprintf (stderr, "if_indextoname (%d) buffer mismatch?\n",
  76                    p->if_index);
  77           return 1;
  78         }
  79       if (strcmp (p->if_name, q) != 0)
  80         {
  81           fprintf (stderr, "if_indextoname (%s) = %s ?!\n", p->if_name, q);
  82           return 1;
  83         }
  84
  85       p++;
  86     }
  87
  88   if_freenameindex (ifnp);
  89 #endif /* HAVE_NET_IF_H */
  90
  91 #if !HAVE_NET_IF_H || HAVE_IF_NAMEINDEX
  92   {
  93     static struct if_nameindex ni;
  94     return !IF_NAMESIZE + ni.if_index + !!ni.if_name;
  95   }
  96 #else
  97   return 0;
  98 #endif
  99 }