3a2c02424d
Whenever getaddrinfo needed network interface information it used the netlink interface to read the information every single time. The problem is that this information can change at any time. The patch implements monitoring of the network interfaces through nscd. If no change is detected the previously read information can be reused (which is the norm). This timestamp information is also made available to other processes using the shared memory segment between nscd and those processes.
73 lines
1.9 KiB
C
73 lines
1.9 KiB
C
/* Determine protocol families for which interfaces exist. Generic version.
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Copyright (C) 2003, 2006, 2011 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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#include <ifaddrs.h>
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#include <netdb.h>
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void
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attribute_hidden
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__check_pf (bool *seen_ipv4, bool *seen_ipv6,
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struct in6addrinfo **in6ai, size_t *in6ailen)
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{
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/* By default we have no way to determine information about
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deprecated and temporary addresses. */
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*in6ai = NULL;
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*in6ailen = 0;
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/* Get the interface list via getifaddrs. */
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struct ifaddrs *ifa = NULL;
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if (getifaddrs (&ifa) != 0)
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{
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/* We cannot determine what interfaces are available. Be
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pessimistic. */
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*seen_ipv4 = true;
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*seen_ipv6 = true;
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return;
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}
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*seen_ipv4 = false;
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*seen_ipv6 = false;
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struct ifaddrs *runp;
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for (runp = ifa; runp != NULL; runp = runp->ifa_next)
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if (runp->ifa_addr->sa_family == PF_INET)
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*seen_ipv4 = true;
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else if (runp->ifa_addr->sa_family == PF_INET6)
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*seen_ipv6 = true;
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(void) freeifaddrs (ifa);
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}
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void
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__free_in6ai (struct in6addrinfo *in6ai)
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{
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/* Nothing to do. */
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}
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#ifdef IS_IN_nscd
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uint32_t
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__bump_nl_timestamp (void)
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{
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return 0;
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}
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#endif
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