| 1 | /*
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| 2 | Unix SMB/CIFS implementation.
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| 3 | return a list of network interfaces
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| 4 | Copyright (C) Andrew Tridgell 1998
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| 5 | Copyright (C) Jeremy Allison 2007
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| 6 |
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| 7 | This program is free software; you can redistribute it and/or modify
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| 8 | it under the terms of the GNU General Public License as published by
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| 9 | the Free Software Foundation; either version 3 of the License, or
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| 10 | (at your option) any later version.
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| 11 |
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| 12 | This program is distributed in the hope that it will be useful,
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| 13 | but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 15 | GNU General Public License for more details.
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| 16 |
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| 17 | You should have received a copy of the GNU General Public License
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| 18 | along with this program. If not, see <http://www.gnu.org/licenses/>.
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| 19 | */
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| 20 |
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| 21 | #include "includes.h"
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| 22 | #include "interfaces.h"
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| 23 |
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| 24 | /****************************************************************************
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| 25 | Create a struct sockaddr_storage with the netmask bits set to 1.
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| 26 | ****************************************************************************/
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| 27 |
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| 28 | bool make_netmask(struct sockaddr_storage *pss_out,
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| 29 | const struct sockaddr_storage *pss_in,
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| 30 | unsigned long masklen)
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| 31 | {
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| 32 | *pss_out = *pss_in;
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| 33 | /* Now apply masklen bits of mask. */
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| 34 | #if defined(HAVE_IPV6)
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| 35 | if (pss_in->ss_family == AF_INET6) {
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| 36 | char *p = (char *)&((struct sockaddr_in6 *)pss_out)->sin6_addr;
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| 37 | unsigned int i;
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| 38 |
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| 39 | if (masklen > 128) {
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| 40 | return false;
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| 41 | }
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| 42 | for (i = 0; masklen >= 8; masklen -= 8, i++) {
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| 43 | *p++ = 0xff;
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| 44 | }
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| 45 | /* Deal with the partial byte. */
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| 46 | *p++ &= (0xff & ~(0xff>>masklen));
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| 47 | i++;
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| 48 | for (;i < sizeof(struct in6_addr); i++) {
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| 49 | *p++ = '\0';
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| 50 | }
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| 51 | return true;
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| 52 | }
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| 53 | #endif
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| 54 | if (pss_in->ss_family == AF_INET) {
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| 55 | if (masklen > 32) {
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| 56 | return false;
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| 57 | }
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| 58 | ((struct sockaddr_in *)pss_out)->sin_addr.s_addr =
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| 59 | htonl(((0xFFFFFFFFL >> masklen) ^ 0xFFFFFFFFL));
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| 60 | return true;
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| 61 | }
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| 62 | return false;
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| 63 | }
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| 64 |
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| 65 | /****************************************************************************
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| 66 | Create a struct sockaddr_storage set to the broadcast or network adress from
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| 67 | an incoming sockaddr_storage.
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| 68 | ****************************************************************************/
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| 69 |
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| 70 | static void make_bcast_or_net(struct sockaddr_storage *pss_out,
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| 71 | const struct sockaddr_storage *pss_in,
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| 72 | const struct sockaddr_storage *nmask,
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| 73 | bool make_bcast_p)
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| 74 | {
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| 75 | unsigned int i = 0, len = 0;
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| 76 | char *pmask = NULL;
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| 77 | char *p = NULL;
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| 78 | *pss_out = *pss_in;
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| 79 |
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| 80 | /* Set all zero netmask bits to 1. */
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| 81 | #if defined(HAVE_IPV6)
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| 82 | if (pss_in->ss_family == AF_INET6) {
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| 83 | p = (char *)&((struct sockaddr_in6 *)pss_out)->sin6_addr;
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| 84 | pmask = (char *)&((struct sockaddr_in6 *)nmask)->sin6_addr;
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| 85 | len = 16;
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| 86 | }
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| 87 | #endif
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| 88 | if (pss_in->ss_family == AF_INET) {
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| 89 | p = (char *)&((struct sockaddr_in *)pss_out)->sin_addr;
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| 90 | pmask = (char *)&((struct sockaddr_in *)nmask)->sin_addr;
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| 91 | len = 4;
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| 92 | }
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| 93 |
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| 94 | for (i = 0; i < len; i++, p++, pmask++) {
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| 95 | if (make_bcast_p) {
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| 96 | *p = (*p & *pmask) | (*pmask ^ 0xff);
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| 97 | } else {
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| 98 | /* make_net */
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