inet/test-ifaddrs.c

   1 /* Test listing of network interface addresses.
   2    Copyright (C) 2002-2024 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 <ifaddrs.h>
  24 #include <netinet/in.h>
  25 #include <arpa/inet.h>
  26
  27 static int failures;
  28
  29 static const char *
  30 addr_string (struct sockaddr *sa, char *buf, size_t size)
  31 {
  32   if (sa == NULL)
  33     return "<none>";
  34
  35   switch (sa->sa_family)
  36     {
  37     case AF_INET:
  38       return inet_ntop (AF_INET, &((struct sockaddr_in *) sa)->sin_addr,
  39                         buf, size);
  40     case AF_INET6:
  41       return inet_ntop (AF_INET6, &((struct sockaddr_in6 *) sa)->sin6_addr,
  42                         buf, size);
  43 #ifdef AF_LINK
  44     case AF_LINK:
  45       return "<link>";
  46 #endif
  47     case AF_UNSPEC:
  48       return "---";
  49
  50 #ifdef AF_PACKET
  51     case AF_PACKET:
  52       return "<packet>";
  53 #endif
  54
  55     default:
  56       ++failures;
  57       printf ("sa_family=%d %08x\n", sa->sa_family,
  58               *(int*)&((struct sockaddr_in *) sa)->sin_addr.s_addr);
  59       return "<unexpected sockaddr family>";
  60     }
  61 }
  62
  63
  64 static int
  65 do_test (void)
  66 {
  67   struct ifaddrs *ifaces, *ifa;
  68
  69   if (getifaddrs (&ifaces) < 0)
  70     {
  71       if (errno != ENOSYS)
  72         {
  73           printf ("Couldn't get any interfaces: %s.\n", strerror (errno));
  74           exit (1);
  75         }
  76       /* The function is simply not implemented.  */
  77       exit (0);
  78     }
  79
  80   puts ("\
  81 Name           Flags   Address         Netmask         Broadcast/Destination");
  82
  83   for (ifa = ifaces; ifa != NULL; ifa = ifa->ifa_next)
  84     {
  85       char abuf[64], mbuf[64], dbuf[64];
  86       printf ("%-15s%#.4x  %-15s %-15s %-15s\n",
  87               ifa->ifa_name, ifa->ifa_flags,
  88               addr_string (ifa->ifa_addr, abuf, sizeof (abuf)),
  89               addr_string (ifa->ifa_netmask, mbuf, sizeof (mbuf)),
  90               addr_string (ifa->ifa_broadaddr, dbuf, sizeof (dbuf)));
  91     }
  92
  93   freeifaddrs (ifaces);
  94
  95   return failures ? 1 : 0;
  96 }
  97
  98 #define TEST_FUNCTION do_test ()
  99 #include "../test-skeleton.c"