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/* Set 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/socket.h>
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#include "getsourcefilter.h"
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int
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setsourcefilter (int s, uint32_t interface, const struct sockaddr *group,
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socklen_t grouplen, uint32_t fmode, uint32_t numsrc,
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const struct sockaddr_storage *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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size_t needed = GROUP_FILTER_SIZE (numsrc);
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int use_alloca = __libc_use_alloca (needed);
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struct group_filter *gf;
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if (use_alloca)
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gf = (struct group_filter *) alloca (needed);
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else
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{
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gf = (struct group_filter *) malloc (needed);
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if (gf == NULL)
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return -1;
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}
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gf->gf_interface = interface;
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memcpy (&gf->gf_group, group, grouplen);
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gf->gf_fmode = fmode;
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gf->gf_numsrc = numsrc;
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memcpy (gf->gf_slist, slist, numsrc * sizeof (struct sockaddr_storage));
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/* We need to provide the appropriate socket level value. */
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int result;
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int sol = __get_sol (group->sa_family, grouplen);
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if (sol == -1)
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{
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__set_errno (EINVAL);
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result = -1;
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}
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else
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result = __setsockopt (s, sol, MCAST_MSFILTER, gf, needed);
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if (! use_alloca)
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{
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int save_errno = errno;
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free (gf);
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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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