inet/test-ifaddrs.c

   1 /* Test listing of network interface addresses.
   2    Copyright (C) 2002, 2004 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, write to the Free
  17    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  18    02111-1307 USA.  */
  19
  20 #include <errno.h>
  21 #include <stdio.h>
  22 #include <stdlib.h>
  23 #include <string.h>
  24 #include <ifaddrs.h>
  25 #include <netinet/in.h>
  26 #include <arpa/inet.h>
  27
  28 static int failures;
  29
  30 static const char *
  31 addr_string (struct sockaddr *sa, char *buf, size_t size)
  32 {
  33   if (sa == NULL)
  34     return "<none>";
  35
  36   switch (sa->sa_family)
  37     {
  38     case AF_INET:
  39       return inet_ntop (AF_INET, &((struct sockaddr_in *) sa)->sin_addr,
  40                         buf, size);
  41     case AF_INET6:
  42       return inet_ntop (AF_INET6, &((struct sockaddr_in6 *) sa)->sin6_addr,
  43                         buf, size);
  44 #ifdef AF_LINK
  45     case AF_LINK:
  46       return "<link>";
  47 #endif
  48     case AF_UNSPEC:
  49       return "---";
  50
  51     case AF_PACKET:
  52       return "<packet>";
  53
  54     default:
  55       ++failures;
  56       printf ("sa_family=%d %08x\n", sa->sa_family,
  57               *(int*)&((struct sockaddr_in *) sa)->sin_addr.s_addr);
  58       return "<unexpected sockaddr family>";
  59     }
  60 }
  61
  62
  63 int
  64 main (void)
  65 {
  66   struct ifaddrs *ifaces, *ifa;
  67
  68   if (getifaddrs (&ifaces) < 0)
  69     {
  70       if (errno != ENOSYS)
  71         {
  72           printf ("Couldn't get any interfaces: %s.\n", strerror (errno));
  73           exit (1);
  74         }
  75       /* The function is simply not implemented.  */
  76       exit (0);
  77     }
  78
  79   puts ("\
  80 Name           Flags   Address         Netmask         Broadcast/Destination");
  81
  82   for (ifa = ifaces; ifa != NULL; ifa = ifa->ifa_next)
  83     {
  84       char abuf[64], mbuf[64], dbuf[64];
  85       printf ("%-15s%#.4x  %-15s %-15s %-15s\n",
  86               ifa->ifa_name, ifa->ifa_flags,
  87               addr_string (ifa->ifa_addr, abuf, sizeof (abuf)),
  88               addr_string (ifa->ifa_netmask, mbuf, sizeof (mbuf)),
  89               addr_string (ifa->ifa_broadaddr, dbuf, sizeof (dbuf)));
  90     }
  91
  92   freeifaddrs (ifaces);
  93
  94   return failures ? 1 : 0;
  95 }