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 #ifdef AF_PACKET
  52     case AF_PACKET:
  53       return "<packet>";
  54 #endif
  55
  56     default:
  57       ++failures;
  58       printf ("sa_family=%d %08x\n", sa->sa_family,
  59               *(int*)&((struct sockaddr_in *) sa)->sin_addr.s_addr);
  60       return "<unexpected sockaddr family>";
  61     }
  62 }
  63
  64
  65 int
  66 main (void)
  67 {
  68   struct ifaddrs *ifaces, *ifa;
  69
  70   if (getifaddrs (&ifaces) < 0)
  71     {
  72       if (errno != ENOSYS)
  73         {
  74           printf ("Couldn't get any interfaces: %s.\n", strerror (errno));
  75           exit (1);
  76         }
  77       /* The function is simply not implemented.  */
  78       exit (0);
  79     }
  80
  81   puts ("\
  82 Name           Flags   Address         Netmask         Broadcast/Destination");
  83
  84   for (ifa = ifaces; ifa != NULL; ifa = ifa->ifa_next)
  85     {
  86       char abuf[64], mbuf[64], dbuf[64];
  87       printf ("%-15s%#.4x  %-15s %-15s %-15s\n",
  88               ifa->ifa_name, ifa->ifa_flags,
  89               addr_string (ifa->ifa_addr, abuf, sizeof (abuf)),
  90               addr_string (ifa->ifa_netmask, mbuf, sizeof (mbuf)),
  91               addr_string (ifa->ifa_broadaddr, dbuf, sizeof (dbuf)));
  92     }
  93
  94   freeifaddrs (ifaces);
  95
  96   return failures ? 1 : 0;
  97 }