2 Unix SMB/CIFS implementation.
3 return a list of network interfaces
4 Copyright (C) Andrew Tridgell 1998
5 Copyright (C) Jeremy Allison 2007
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program. If not, see <http://www.gnu.org/licenses/>.
23 /****************************************************************************
24 Create a struct sockaddr_storage with the netmask bits set to 1.
25 ****************************************************************************/
27 bool make_netmask(struct sockaddr_storage *pss_out,
28 const struct sockaddr_storage *pss_in,
29 unsigned long masklen)
32 /* Now apply masklen bits of mask. */
33 #if defined(HAVE_IPV6)
34 if (pss_in->ss_family == AF_INET6) {
35 char *p = (char *)&((struct sockaddr_in6 *)pss_out)->sin6_addr;
41 for (i = 0; masklen >= 8; masklen -= 8, i++) {
44 /* Deal with the partial byte. */
45 *p++ &= (0xff & ~(0xff>>masklen));
47 for (;i < sizeof(struct in6_addr); i++) {
53 if (pss_in->ss_family == AF_INET) {
57 ((struct sockaddr_in *)pss_out)->sin_addr.s_addr =
58 htonl(((0xFFFFFFFFL >> masklen) ^ 0xFFFFFFFFL));
64 /****************************************************************************
65 Create a struct sockaddr_storage set to the broadcast or network adress from
66 an incoming sockaddr_storage.
67 ****************************************************************************/
69 static void make_bcast_or_net(struct sockaddr_storage *pss_out,
70 const struct sockaddr_storage *pss_in,
71 const struct sockaddr_storage *nmask,
74 unsigned int i = 0, len = 0;
79 /* Set all zero netmask bits to 1. */
80 #if defined(HAVE_IPV6)
81 if (pss_in->ss_family == AF_INET6) {
82 p = (char *)&((struct sockaddr_in6 *)pss_out)->sin6_addr;
83 pmask = (char *)&((struct sockaddr_in6 *)nmask)->sin6_addr;
87 if (pss_in->ss_family == AF_INET) {
88 p = (char *)&((struct sockaddr_in *)pss_out)->sin_addr;
89 pmask = (char *)&((struct sockaddr_in *)nmask)->sin_addr;
93 for (i = 0; i < len; i++, p++, pmask++) {
95 *p = (*p & *pmask) | (*pmask ^ 0xff);
103 void make_bcast(struct sockaddr_storage *pss_out,
104 const struct sockaddr_storage *pss_in,
105 const struct sockaddr_storage *nmask)
107 make_bcast_or_net(pss_out, pss_in, nmask, true);
110 void make_net(struct sockaddr_storage *pss_out,
111 const struct sockaddr_storage *pss_in,
112 const struct sockaddr_storage *nmask)
114 make_bcast_or_net(pss_out, pss_in, nmask, false);
117 /****************************************************************************
118 Try the "standard" getifaddrs/freeifaddrs interfaces.
119 Also gets IPv6 interfaces.
120 ****************************************************************************/
122 /****************************************************************************
123 Get the netmask address for a local interface.
124 ****************************************************************************/
126 static int _get_interfaces(struct iface_struct *ifaces, int max_interfaces)
128 struct ifaddrs *iflist = NULL;
129 struct ifaddrs *ifptr = NULL;
133 if (getifaddrs(&iflist) < 0) {
137 /* Loop through interfaces, looking for given IP address */
138 for (ifptr = iflist, total = 0;
139 ifptr != NULL && total < max_interfaces;
140 ifptr = ifptr->ifa_next) {
142 memset(&ifaces[total], '\0', sizeof(ifaces[total]));
144 copy_size = sizeof(struct sockaddr_in);
146 if (!ifptr->ifa_addr || !ifptr->ifa_netmask) {
150 ifaces[total].flags = ifptr->ifa_flags;
152 /* Check the interface is up. */
153 if (!(ifaces[total].flags & IFF_UP)) {
157 #if defined(HAVE_IPV6)
158 if (ifptr->ifa_addr->sa_family == AF_INET6) {
159 copy_size = sizeof(struct sockaddr_in6);
163 memcpy(&ifaces[total].ip, ifptr->ifa_addr, copy_size);
164 memcpy(&ifaces[total].netmask, ifptr->ifa_netmask, copy_size);
166 if (ifaces[total].flags & (IFF_BROADCAST|IFF_LOOPBACK)) {
167 make_bcast(&ifaces[total].bcast,
169 &ifaces[total].netmask);
170 } else if ((ifaces[total].flags & IFF_POINTOPOINT) &&
171 ifptr->ifa_dstaddr ) {
172 memcpy(&ifaces[total].bcast,
179 strlcpy(ifaces[total].name, ifptr->ifa_name,
180 sizeof(ifaces[total].name));
189 static int iface_comp(struct iface_struct *i1, struct iface_struct *i2)
193 #if defined(HAVE_IPV6)
195 * If we have IPv6 - sort these interfaces lower
196 * than any IPv4 ones.
198 if (i1->ip.ss_family == AF_INET6 &&
199 i2->ip.ss_family == AF_INET) {
201 } else if (i1->ip.ss_family == AF_INET &&
202 i2->ip.ss_family == AF_INET6) {
206 if (i1->ip.ss_family == AF_INET6) {
207 struct sockaddr_in6 *s1 = (struct sockaddr_in6 *)&i1->ip;
208 struct sockaddr_in6 *s2 = (struct sockaddr_in6 *)&i2->ip;
210 r = memcmp(&s1->sin6_addr,
212 sizeof(struct in6_addr));
217 s1 = (struct sockaddr_in6 *)&i1->netmask;
218 s2 = (struct sockaddr_in6 *)&i2->netmask;
220 r = memcmp(&s1->sin6_addr,
222 sizeof(struct in6_addr));
229 /* AIX uses __ss_family instead of ss_family inside of
230 sockaddr_storage. Instead of trying to figure out which field to
231 use, we can just cast it to a sockaddr.
234 if (((struct sockaddr *)&i1->ip)->sa_family == AF_INET) {
235 struct sockaddr_in *s1 = (struct sockaddr_in *)&i1->ip;
236 struct sockaddr_in *s2 = (struct sockaddr_in *)&i2->ip;
238 r = ntohl(s1->sin_addr.s_addr) -
239 ntohl(s2->sin_addr.s_addr);
244 s1 = (struct sockaddr_in *)&i1->netmask;
245 s2 = (struct sockaddr_in *)&i2->netmask;
247 return ntohl(s1->sin_addr.s_addr) -
248 ntohl(s2->sin_addr.s_addr);
253 int get_interfaces(struct iface_struct *ifaces, int max_interfaces);
254 /* this wrapper is used to remove duplicates from the interface list generated
256 int get_interfaces(struct iface_struct *ifaces, int max_interfaces)
260 total = _get_interfaces(ifaces, max_interfaces);
261 if (total <= 0) return total;
263 /* now we need to remove duplicates */
264 qsort(ifaces, total, sizeof(ifaces[0]), QSORT_CAST iface_comp);
267 if (iface_comp(&ifaces[i-1], &ifaces[i]) == 0) {
268 for (j=i-1;j<total-1;j++) {
269 ifaces[j] = ifaces[j+1];