| 1 | /* Determine protocol families for which interfaces exist. Generic version. |
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| 2 | Copyright (C) 2003-2022 Free Software Foundation, Inc. |
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| 3 | This file is part of the GNU C Library. |
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| 4 | |
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| 5 | The GNU C Library is free software; you can redistribute it and/or |
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| 6 | modify it under the terms of the GNU Lesser General Public |
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| 7 | License as published by the Free Software Foundation; either |
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| 8 | version 2.1 of the License, or (at your option) any later version. |
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| 9 | |
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| 10 | The GNU C Library is distributed in the hope that it will be useful, |
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| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 13 | Lesser General Public License for more details. |
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| 14 | |
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| 15 | You should have received a copy of the GNU Lesser General Public |
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| 16 | License along with the GNU C Library; if not, see |
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| 17 | <https://www.gnu.org/licenses/>. */ |
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| 18 | |
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| 19 | #include <ifaddrs.h> |
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| 20 | #include <netdb.h> |
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| 21 | #include <stdint.h> |
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| 22 | |
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| 23 | void |
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| 24 | attribute_hidden |
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| 25 | __check_pf (bool *seen_ipv4, bool *seen_ipv6, |
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| 26 | struct in6addrinfo **in6ai, size_t *in6ailen) |
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| 27 | { |
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| 28 | /* By default we have no way to determine information about |
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| 29 | deprecated and temporary addresses. */ |
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| 30 | *in6ai = NULL; |
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| 31 | *in6ailen = 0; |
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| 32 | |
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| 33 | /* Get the interface list via getifaddrs. */ |
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| 34 | struct ifaddrs *ifa = NULL; |
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| 35 | if (__getifaddrs (&ifa) != 0) |
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| 36 | { |
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| 37 | /* We cannot determine what interfaces are available. Be |
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| 38 | pessimistic. */ |
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| 39 | *seen_ipv4 = true; |
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| 40 | *seen_ipv6 = true; |
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| 41 | return; |
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| 42 | } |
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| 43 | |
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| 44 | *seen_ipv4 = false; |
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| 45 | *seen_ipv6 = false; |
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| 46 | |
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| 47 | struct ifaddrs *runp; |
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| 48 | for (runp = ifa; runp != NULL; runp = runp->ifa_next) |
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| 49 | if (runp->ifa_addr->sa_family == PF_INET) |
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| 50 | *seen_ipv4 = true; |
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| 51 | else if (runp->ifa_addr->sa_family == PF_INET6) |
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| 52 | *seen_ipv6 = true; |
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| 53 | |
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| 54 | (void) __freeifaddrs (ifa); |
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| 55 | } |
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| 56 | |
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| 57 | |
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| 58 | void |
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| 59 | __free_in6ai (struct in6addrinfo *in6ai) |
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| 60 | { |
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| 61 | /* Nothing to do. */ |
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| 62 | } |
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| 63 | |
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| 64 | |
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| 65 | #if IS_IN (nscd) |
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| 66 | uint32_t |
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| 67 | __bump_nl_timestamp (void) |
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| 68 | { |
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| 69 | return 0; |
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| 70 | } |
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| 71 | #endif |
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| 72 | |
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