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489aa29d | 1 | /* Get IPv4 source filter. Linux version. |
d4697bc9 | 2 | Copyright (C) 2004-2014 Free Software Foundation, Inc. |
489aa29d UD |
3 | This file is part of the GNU C Library. |
4 | Contributed by Ulrich Drepper <drepper@redhat.com>, 2004. | |
5 | ||
6 | The GNU C Library is free software; you can redistribute it and/or | |
7 | modify it under the terms of the GNU Lesser General Public | |
8 | License as published by the Free Software Foundation; either | |
9 | version 2.1 of the License, or (at your option) any later version. | |
10 | ||
11 | The GNU C Library is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 | Lesser General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU Lesser General Public | |
59ba27a6 PE |
17 | License along with the GNU C Library; if not, see |
18 | <http://www.gnu.org/licenses/>. */ | |
489aa29d UD |
19 | |
20 | #include <alloca.h> | |
21 | #include <errno.h> | |
22 | #include <stdlib.h> | |
23 | #include <string.h> | |
e054f494 | 24 | #include <stdint.h> |
489aa29d | 25 | #include <netinet/in.h> |
9030e7c4 | 26 | #include <sys/param.h> |
489aa29d UD |
27 | #include <sys/socket.h> |
28 | ||
29 | ||
30 | int | |
31 | getipv4sourcefilter (int s, struct in_addr interface, struct in_addr group, | |
32 | uint32_t *fmode, uint32_t *numsrc, struct in_addr *slist) | |
33 | { | |
34 | /* We have to create an struct ip_msfilter object which we can pass | |
35 | to the kernel. */ | |
36 | socklen_t needed = IP_MSFILTER_SIZE (*numsrc); | |
9030e7c4 | 37 | int use_alloca = __libc_use_alloca (needed); |
489aa29d UD |
38 | |
39 | struct ip_msfilter *imsf; | |
9030e7c4 UD |
40 | if (use_alloca) |
41 | imsf = (struct ip_msfilter *) alloca (needed); | |
42 | else | |
489aa29d UD |
43 | { |
44 | imsf = (struct ip_msfilter *) malloc (needed); | |
45 | if (imsf == NULL) | |
46 | return -1; | |
47 | } | |
489aa29d UD |
48 | |
49 | imsf->imsf_multiaddr = group; | |
50 | imsf->imsf_interface = interface; | |
9030e7c4 | 51 | imsf->imsf_numsrc = *numsrc; |
489aa29d UD |
52 | |
53 | int result = __getsockopt (s, SOL_IP, IP_MSFILTER, imsf, &needed); | |
54 | ||
55 | /* If successful, copy the results to the places the caller wants | |
56 | them in. */ | |
57 | if (result == 0) | |
58 | { | |
59 | *fmode = imsf->imsf_fmode; | |
489aa29d | 60 | memcpy (slist, imsf->imsf_slist, |
9030e7c4 UD |
61 | MIN (*numsrc, imsf->imsf_numsrc) * sizeof (struct in_addr)); |
62 | *numsrc = imsf->imsf_numsrc; | |
489aa29d UD |
63 | } |
64 | ||
9030e7c4 | 65 | if (! use_alloca) |
489aa29d UD |
66 | { |
67 | int save_errno = errno; | |
68 | free (imsf); | |
69 | __set_errno (save_errno); | |
70 | } | |
71 | ||
72 | return result; | |
73 | } |