diff options
Diffstat (limited to 'REORG.TODO/sysdeps/unix/sysv/linux/setsourcefilter.c')
-rw-r--r-- | REORG.TODO/sysdeps/unix/sysv/linux/setsourcefilter.c | 78 |
1 files changed, 78 insertions, 0 deletions
diff --git a/REORG.TODO/sysdeps/unix/sysv/linux/setsourcefilter.c b/REORG.TODO/sysdeps/unix/sysv/linux/setsourcefilter.c new file mode 100644 index 0000000000..b4160ff4d8 --- /dev/null +++ b/REORG.TODO/sysdeps/unix/sysv/linux/setsourcefilter.c @@ -0,0 +1,78 @@ +/* Set source filter. Linux version. + Copyright (C) 2004-2017 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Contributed by Ulrich Drepper <drepper@redhat.com>, 2004. + + 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 + <http://www.gnu.org/licenses/>. */ + +#include <alloca.h> +#include <errno.h> +#include <stdlib.h> +#include <string.h> +#include <stdint.h> +#include <netinet/in.h> +#include <sys/socket.h> + + +/* Defined in getsourcefilter.c. */ +extern int __get_sol (int af, socklen_t len); + + +int +setsourcefilter (int s, uint32_t interface, const struct sockaddr *group, + socklen_t grouplen, uint32_t fmode, uint32_t numsrc, + const struct sockaddr_storage *slist) +{ + /* We have to create an struct ip_msfilter object which we can pass + to the kernel. */ + size_t needed = GROUP_FILTER_SIZE (numsrc); + int use_alloca = __libc_use_alloca (needed); + + struct group_filter *gf; + if (use_alloca) + gf = (struct group_filter *) alloca (needed); + else + { + gf = (struct group_filter *) malloc (needed); + if (gf == NULL) + return -1; + } + + gf->gf_interface = interface; + memcpy (&gf->gf_group, group, grouplen); + gf->gf_fmode = fmode; + gf->gf_numsrc = numsrc; + memcpy (gf->gf_slist, slist, numsrc * sizeof (struct sockaddr_storage)); + + /* We need to provide the appropriate socket level value. */ + int result; + int sol = __get_sol (group->sa_family, grouplen); + if (sol == -1) + { + __set_errno (EINVAL); + result = -1; + } + else + result = __setsockopt (s, sol, MCAST_MSFILTER, gf, needed); + + if (! use_alloca) + { + int save_errno = errno; + free (gf); + __set_errno (save_errno); + } + + return result; +} |