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/* Get IPv4 source filter. Linux version.
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Copyright (C) 2004-2018 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Ulrich Drepper <drepper@redhat.com>, 2004.
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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, see
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<http://www.gnu.org/licenses/>. */
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#include <alloca.h>
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#include <errno.h>
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#include <stdlib.h>
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#include <string.h>
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#include <stdint.h>
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#include <netinet/in.h>
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#include <sys/param.h>
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#include <sys/socket.h>
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int
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getipv4sourcefilter (int s, struct in_addr interface, struct in_addr group,
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uint32_t *fmode, uint32_t *numsrc, struct in_addr *slist)
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{
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/* We have to create an struct ip_msfilter object which we can pass
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to the kernel. */
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socklen_t needed = IP_MSFILTER_SIZE (*numsrc);
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int use_alloca = __libc_use_alloca (needed);
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struct ip_msfilter *imsf;
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if (use_alloca)
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imsf = (struct ip_msfilter *) alloca (needed);
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else
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{
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imsf = (struct ip_msfilter *) malloc (needed);
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if (imsf == NULL)
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return -1;
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}
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imsf->imsf_multiaddr = group;
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imsf->imsf_interface = interface;
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imsf->imsf_numsrc = *numsrc;
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int result = __getsockopt (s, SOL_IP, IP_MSFILTER, imsf, &needed);
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/* If successful, copy the results to the places the caller wants
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them in. */
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if (result == 0)
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{
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*fmode = imsf->imsf_fmode;
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memcpy (slist, imsf->imsf_slist,
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MIN (*numsrc, imsf->imsf_numsrc) * sizeof (struct in_addr));
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*numsrc = imsf->imsf_numsrc;
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}
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if (! use_alloca)
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{
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int save_errno = errno;
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free (imsf);
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__set_errno (save_errno);
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}
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return result;
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}
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