diff options
Diffstat (limited to 'REORG.TODO/sysdeps/unix/sysv/linux/getsourcefilter.c')
| -rw-r--r-- | REORG.TODO/sysdeps/unix/sysv/linux/getsourcefilter.c | 146 |
1 files changed, 146 insertions, 0 deletions
diff --git a/REORG.TODO/sysdeps/unix/sysv/linux/getsourcefilter.c b/REORG.TODO/sysdeps/unix/sysv/linux/getsourcefilter.c new file mode 100644 index 0000000000..806cb161e4 --- /dev/null +++ b/REORG.TODO/sysdeps/unix/sysv/linux/getsourcefilter.c @@ -0,0 +1,146 @@ +/* Get 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 <assert.h> +#include <errno.h> +#include <stdlib.h> +#include <string.h> +#include <stdint.h> +#include <netatalk/at.h> +#include <netax25/ax25.h> +#include <netinet/in.h> +#include <netipx/ipx.h> +#include <netpacket/packet.h> +#include <netrose/rose.h> +#include <sys/param.h> +#include <sys/socket.h> + + +static const struct +{ + int sol; + int af; + socklen_t size; +} sol_map[] = + { + /* Sort the array according to importance of the protocols. Add + more protocols when they become available. */ + { SOL_IP, AF_INET, sizeof (struct sockaddr_in) }, + { SOL_IPV6, AF_INET6, sizeof (struct sockaddr_in6) }, + { SOL_AX25, AF_AX25, sizeof (struct sockaddr_ax25) }, + { SOL_IPX, AF_IPX, sizeof (struct sockaddr_ipx) }, + { SOL_ATALK, AF_APPLETALK, sizeof (struct sockaddr_at) }, + { SOL_ROSE, AF_ROSE, sizeof (struct sockaddr_rose) }, + { SOL_PACKET, AF_PACKET, sizeof (struct sockaddr_ll) } + }; +#define NSOL_MAP (sizeof (sol_map) / sizeof (sol_map[0])) + + +/* Try to determine the socket level value. Ideally both side and + family are set. But sometimes only the size is correct and the + family value might be bogus. Loop over the array entries and look + for a perfect match or the first match based on size. */ +int +__get_sol (int af, socklen_t len) +{ + int first_size_sol = -1; + + for (size_t cnt = 0; cnt < NSOL_MAP; ++cnt) + { + /* Just a test so that we make sure the special value used to + signal the "we have so far no socket level value" is OK. */ + assert (sol_map[cnt].sol != -1); + + if (len == sol_map[cnt].size) + { + /* The size matches, which is a requirement. If the family + matches, too, we have a winner. Otherwise we remember the + socket level value for this protocol if it is the first + match. */ + if (af == sol_map[cnt].af) + /* Bingo! */ + return sol_map[cnt].sol; + + if (first_size_sol == -1) + first_size_sol = sol_map[cnt].sol; + } + } + + return first_size_sol; +} + + +int +getsourcefilter (int s, uint32_t interface, const struct sockaddr *group, + socklen_t grouplen, uint32_t *fmode, uint32_t *numsrc, + struct sockaddr_storage *slist) +{ + /* We have to create an struct ip_msfilter object which we can pass + to the kernel. */ + socklen_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_numsrc = *numsrc; + + /* 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 = __getsockopt (s, sol, MCAST_MSFILTER, gf, &needed); + + /* If successful, copy the results to the places the caller wants + them in. */ + if (result == 0) + { + *fmode = gf->gf_fmode; + memcpy (slist, gf->gf_slist, + MIN (*numsrc, gf->gf_numsrc) + * sizeof (struct sockaddr_storage)); + *numsrc = gf->gf_numsrc; + } + } + + if (! use_alloca) + { + int save_errno = errno; + free (gf); + __set_errno (save_errno); + } + + return result; +} |