inet/check_pf.c

   1 /* Determine protocol families for which interfaces exist.  Generic version.
   2    Copyright (C) 2003-2022 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 <ifaddrs.h>
  20 #include <netdb.h>
  21 #include <stdint.h>
  22
  23 void
  24 attribute_hidden
  25 __check_pf (bool *seen_ipv4, bool *seen_ipv6,
  26             struct in6addrinfo **in6ai, size_t *in6ailen)
  27 {
  28   /* By default we have no way to determine information about
  29      deprecated and temporary addresses.  */
  30   *in6ai = NULL;
  31   *in6ailen = 0;
  32
  33   /* Get the interface list via getifaddrs.  */
  34   struct ifaddrs *ifa = NULL;
  35   if (__getifaddrs (&ifa) != 0)
  36     {
  37       /* We cannot determine what interfaces are available.  Be
  38          pessimistic.  */
  39       *seen_ipv4 = true;
  40       *seen_ipv6 = true;
  41       return;
  42     }
  43
  44   *seen_ipv4 = false;
  45   *seen_ipv6 = false;
  46
  47   struct ifaddrs *runp;
  48   for (runp = ifa; runp != NULL; runp = runp->ifa_next)
  49     if (runp->ifa_addr->sa_family == PF_INET)
  50       *seen_ipv4 = true;
  51     else if (runp->ifa_addr->sa_family == PF_INET6)
  52       *seen_ipv6 = true;
  53
  54   (void) __freeifaddrs (ifa);
  55 }
  56
  57
  58 void
  59 __free_in6ai (struct in6addrinfo *in6ai)
  60 {
  61   /* Nothing to do.  */
  62 }
  63
  64
  65 #if IS_IN (nscd)
  66 uint32_t
  67 __bump_nl_timestamp (void)
  68 {
  69   return 0;
  70 }
  71 #endif