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/* Determine protocol families for which interfaces exist. Generic version.
Copyright (C) 2003-2024 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include <ifaddrs.h>
#include <netdb.h>
#include <stdint.h>
void
attribute_hidden
__check_pf (bool *seen_ipv4, bool *seen_ipv6,
struct in6addrinfo **in6ai, size_t *in6ailen)
{
/* By default we have no way to determine information about
deprecated and temporary addresses. */
*in6ai = NULL;
*in6ailen = 0;
/* Get the interface list via getifaddrs. */
struct ifaddrs *ifa = NULL;
if (__getifaddrs (&ifa) != 0)
{
/* We cannot determine what interfaces are available. Be
pessimistic. */
*seen_ipv4 = true;
*seen_ipv6 = true;
return;
}
*seen_ipv4 = false;
*seen_ipv6 = false;
struct ifaddrs *runp;
for (runp = ifa; runp != NULL; runp = runp->ifa_next)
if (runp->ifa_addr->sa_family == PF_INET)
*seen_ipv4 = true;
else if (runp->ifa_addr->sa_family == PF_INET6)
*seen_ipv6 = true;
(void) __freeifaddrs (ifa);
}
void
__free_in6ai (struct in6addrinfo *in6ai)
{
/* Nothing to do. */
}
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