source: branches/samba-3.3.x/source/lib/interfaces.c@ 432

Last change on this file since 432 was 222, checked in by Herwig Bauernfeind, 16 years ago

Update Samba 3.3 branch to 3.3.2
File size: 7.4 KB
Line 
1/*
2 Unix SMB/CIFS implementation.
3 return a list of network interfaces
4 Copyright (C) Andrew Tridgell 1998
5 Copyright (C) Jeremy Allison 2007
6
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.
11
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.
16
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/>.
19*/
20
21#include "includes.h"
22
23/****************************************************************************
24 Create a struct sockaddr_storage with the netmask bits set to 1.
25****************************************************************************/
26
27bool make_netmask(struct sockaddr_storage *pss_out,
28 const struct sockaddr_storage *pss_in,
29 unsigned long masklen)
30{
31 *pss_out = *pss_in;
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;
36 unsigned int i;
37
38 if (masklen > 128) {
39 return false;
40 }
41 for (i = 0; masklen >= 8; masklen -= 8, i++) {
42 *p++ = 0xff;
43 }
44 /* Deal with the partial byte. */
45 *p++ &= (0xff & ~(0xff>>masklen));
46 i++;
47 for (;i < sizeof(struct in6_addr); i++) {
48 *p++ = '\0';
49 }
50 return true;
51 }
52#endif
53 if (pss_in->ss_family == AF_INET) {
54 if (masklen > 32) {
55 return false;
56 }
57 ((struct sockaddr_in *)pss_out)->sin_addr.s_addr =
58 htonl(((0xFFFFFFFFL >> masklen) ^ 0xFFFFFFFFL));
59 return true;
60 }
61 return false;
62}
63
64/****************************************************************************
65 Create a struct sockaddr_storage set to the broadcast or network adress from
66 an incoming sockaddr_storage.
67****************************************************************************/
68
69static void make_bcast_or_net(struct sockaddr_storage *pss_out,
70 const struct sockaddr_storage *pss_in,
71 const struct sockaddr_storage *nmask,
72 bool make_bcast_p)
73{
74 unsigned int i = 0, len = 0;
75 char *pmask = NULL;
76 char *p = NULL;
77 *pss_out = *pss_in;
78
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;
84 len = 16;
85 }
86#endif
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;
90 len = 4;
91 }
92
93 for (i = 0; i < len; i++, p++, pmask++) {
94 if (make_bcast_p) {
95 *p = (*p & *pmask) | (*pmask ^ 0xff);
96 } else {
97 /* make_net */
98 *p = (*p & *pmask);
99 }
100 }
101}
102
103void make_bcast(struct sockaddr_storage *pss_out,
104 const struct sockaddr_storage *pss_in,
105 const struct sockaddr_storage *nmask)
106{
107 make_bcast_or_net(pss_out, pss_in, nmask, true);
108}
109
110void make_net(struct sockaddr_storage *pss_out,
111 const struct sockaddr_storage *pss_in,
112 const struct sockaddr_storage *nmask)
113{
114 make_bcast_or_net(pss_out, pss_in, nmask, false);
115}
116
117/****************************************************************************
118 Try the "standard" getifaddrs/freeifaddrs interfaces.
119 Also gets IPv6 interfaces.
120****************************************************************************/
121
122/****************************************************************************
123 Get the netmask address for a local interface.
124****************************************************************************/
125
126static int _get_interfaces(struct iface_struct *ifaces, int max_interfaces)
127{
128 struct ifaddrs *iflist = NULL;
129 struct ifaddrs *ifptr = NULL;
130 int total = 0;
131 size_t copy_size;
132
133 if (getifaddrs(&iflist) < 0) {
134 return -1;
135 }
136
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) {
141
142 memset(&ifaces[total], '\0', sizeof(ifaces[total]));
143
144 copy_size = sizeof(struct sockaddr_in);
145
146 if (!ifptr->ifa_addr || !ifptr->ifa_netmask) {
147 continue;
148 }
149
150 ifaces[total].flags = ifptr->ifa_flags;
151
152 /* Check the interface is up. */
153 if (!(ifaces[total].flags & IFF_UP)) {
154 continue;
155 }
156
157#if defined(HAVE_IPV6)
158 if (ifptr->ifa_addr->sa_family == AF_INET6) {
159 copy_size = sizeof(struct sockaddr_in6);
160 }
161#endif
162
163 memcpy(&ifaces[total].ip, ifptr->ifa_addr, copy_size);
164 memcpy(&ifaces[total].netmask, ifptr->ifa_netmask, copy_size);
165
166 if (ifaces[total].flags & (IFF_BROADCAST|IFF_LOOPBACK)) {
167 make_bcast(&ifaces[total].bcast,
168 &ifaces[total].ip,
169 &ifaces[total].netmask);
170 } else if ((ifaces[total].flags & IFF_POINTOPOINT) &&
171 ifptr->ifa_dstaddr ) {
172 memcpy(&ifaces[total].bcast,
173 ifptr->ifa_dstaddr,
174 copy_size);
175 } else {
176 continue;
177 }
178
179 strlcpy(ifaces[total].name, ifptr->ifa_name,
180 sizeof(ifaces[total].name));
181 total++;
182 }
183
184 freeifaddrs(iflist);
185
186 return total;
187}
188
189static int iface_comp(struct iface_struct *i1, struct iface_struct *i2)
190{
191 int r;
192
193#if defined(HAVE_IPV6)
194 /*
195 * If we have IPv6 - sort these interfaces lower
196 * than any IPv4 ones.
197 */
198 if (i1->ip.ss_family == AF_INET6 &&
199 i2->ip.ss_family == AF_INET) {
200 return -1;
201 } else if (i1->ip.ss_family == AF_INET &&
202 i2->ip.ss_family == AF_INET6) {
203 return 1;
204 }
205
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;
209
210 r = memcmp(&s1->sin6_addr,
211 &s2->sin6_addr,
212 sizeof(struct in6_addr));
213 if (r) {
214 return r;
215 }
216
217 s1 = (struct sockaddr_in6 *)&i1->netmask;
218 s2 = (struct sockaddr_in6 *)&i2->netmask;
219
220 r = memcmp(&s1->sin6_addr,
221 &s2->sin6_addr,
222 sizeof(struct in6_addr));
223 if (r) {
224 return r;
225 }
226 }
227#endif
228
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.
232 */
233
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;
237
238 r = ntohl(s1->sin_addr.s_addr) -
239 ntohl(s2->sin_addr.s_addr);
240 if (r) {
241 return r;
242 }
243
244 s1 = (struct sockaddr_in *)&i1->netmask;
245 s2 = (struct sockaddr_in *)&i2->netmask;
246
247 return ntohl(s1->sin_addr.s_addr) -
248 ntohl(s2->sin_addr.s_addr);
249 }
250 return 0;
251}
252
253int get_interfaces(struct iface_struct *ifaces, int max_interfaces);
254/* this wrapper is used to remove duplicates from the interface list generated
255 above */
256int get_interfaces(struct iface_struct *ifaces, int max_interfaces)
257{
258 int total, i, j;
259
260 total = _get_interfaces(ifaces, max_interfaces);
261 if (total <= 0) return total;
262
263 /* now we need to remove duplicates */
264 qsort(ifaces, total, sizeof(ifaces[0]), QSORT_CAST iface_comp);
265
266 for (i=1;i<total;) {
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];
270 }
271 total--;
272 } else {
273 i++;
274 }
275 }
276
277 return total;
278}
279
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