1  /* Determine protocol families for which interfaces exist.  Generic version.
       2     Copyright (C) 2003-2023 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 <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