1  /* Test listing of network interface addresses.
       2     Copyright (C) 2002-2023 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"