diff options
Diffstat (limited to 'REORG.TODO/sysdeps/unix/sysv/linux/getipv4sourcefilter.c')
-rw-r--r-- | REORG.TODO/sysdeps/unix/sysv/linux/getipv4sourcefilter.c | 73 |
1 files changed, 73 insertions, 0 deletions
diff --git a/REORG.TODO/sysdeps/unix/sysv/linux/getipv4sourcefilter.c b/REORG.TODO/sysdeps/unix/sysv/linux/getipv4sourcefilter.c new file mode 100644 index 0000000000..004c83e916 --- /dev/null +++ b/REORG.TODO/sysdeps/unix/sysv/linux/getipv4sourcefilter.c @@ -0,0 +1,73 @@ +/* Get IPv4 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/param.h> +#include <sys/socket.h> + + +int +getipv4sourcefilter (int s, struct in_addr interface, struct in_addr group, + uint32_t *fmode, uint32_t *numsrc, struct in_addr *slist) +{ + /* We have to create an struct ip_msfilter object which we can pass + to the kernel. */ + socklen_t needed = IP_MSFILTER_SIZE (*numsrc); + int use_alloca = __libc_use_alloca (needed); + + struct ip_msfilter *imsf; + if (use_alloca) + imsf = (struct ip_msfilter *) alloca (needed); + else + { + imsf = (struct ip_msfilter *) malloc (needed); + if (imsf == NULL) + return -1; + } + + imsf->imsf_multiaddr = group; + imsf->imsf_interface = interface; + imsf->imsf_numsrc = *numsrc; + + int result = __getsockopt (s, SOL_IP, IP_MSFILTER, imsf, &needed); + + /* If successful, copy the results to the places the caller wants + them in. */ + if (result == 0) + { + *fmode = imsf->imsf_fmode; + memcpy (slist, imsf->imsf_slist, + MIN (*numsrc, imsf->imsf_numsrc) * sizeof (struct in_addr)); + *numsrc = imsf->imsf_numsrc; + } + + if (! use_alloca) + { + int save_errno = errno; + free (imsf); + __set_errno (save_errno); + } + + return result; +} |