source: branches/samba-3.5.x/source3/lib/interfaces.c@ 739

Last change on this file since 739 was 414, checked in by Herwig Bauernfeind, 15 years ago

Samba 3.5.0: Initial import
File size: 7.5 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(TALLOC_CTX *mem_ctx, struct iface_struct **pifaces)
127{
128 struct iface_struct *ifaces;
129 struct ifaddrs *iflist = NULL;
130 struct ifaddrs *ifptr = NULL;
131 int count;
132 int total = 0;
133 size_t copy_size;
134
135 if (getifaddrs(&iflist) < 0) {
136 return -1;
137 }
138
139 count = 0;
140 for (ifptr = iflist; ifptr != NULL; ifptr = ifptr->ifa_next) {
141 if (!ifptr->ifa_addr || !ifptr->ifa_netmask) {
142 continue;
143 }
144 if (!(ifptr->ifa_flags & IFF_UP)) {
145 continue;
146 }
147 count += 1;
148 }
149
150 ifaces = talloc_array(mem_ctx, struct iface_struct, count);
151 if (ifaces == NULL) {
152 errno = ENOMEM;
153 return -1;
154 }
155
156 /* Loop through interfaces, looking for given IP address */
157 for (ifptr = iflist; ifptr != NULL; ifptr = ifptr->ifa_next) {
158
159 if (!ifptr->ifa_addr || !ifptr->ifa_netmask) {
160 continue;
161 }
162
163 /* Check the interface is up. */
164 if (!(ifptr->ifa_flags & IFF_UP)) {
165 continue;
166 }
167
168 memset(&ifaces[total], '\0', sizeof(ifaces[total]));
169
170 copy_size = sizeof(struct sockaddr_in);
171
172 ifaces[total].flags = ifptr->ifa_flags;
173
174#if defined(HAVE_IPV6)
175 if (ifptr->ifa_addr->sa_family == AF_INET6) {
176 copy_size = sizeof(struct sockaddr_in6);
177 }
178#endif
179
180 memcpy(&ifaces[total].ip, ifptr->ifa_addr, copy_size);
181 memcpy(&ifaces[total].netmask, ifptr->ifa_netmask, copy_size);
182
183 if (ifaces[total].flags & (IFF_BROADCAST|IFF_LOOPBACK)) {
184 make_bcast(&ifaces[total].bcast,
185 &ifaces[total].ip,
186 &ifaces[total].netmask);
187 } else if ((ifaces[total].flags & IFF_POINTOPOINT) &&
188 ifptr->ifa_dstaddr ) {
189 memcpy(&ifaces[total].bcast,
190 ifptr->ifa_dstaddr,
191 copy_size);
192 } else {
193 continue;
194 }
195
196 strlcpy(ifaces[total].name, ifptr->ifa_name,
197 sizeof(ifaces[total].name));
198 total++;
199 }
200
201 freeifaddrs(iflist);
202
203 *pifaces = ifaces;
204 return total;
205}
206
207static int iface_comp(struct iface_struct *i1, struct iface_struct *i2)
208{
209 int r;
210
211#if defined(HAVE_IPV6)
212 /*
213 * If we have IPv6 - sort these interfaces lower
214 * than any IPv4 ones.
215 */
216 if (i1->ip.ss_family == AF_INET6 &&
217 i2->ip.ss_family == AF_INET) {
218 return -1;
219 } else if (i1->ip.ss_family == AF_INET &&
220 i2->ip.ss_family == AF_INET6) {
221 return 1;
222 }
223
224 if (i1->ip.ss_family == AF_INET6) {
225 struct sockaddr_in6 *s1 = (struct sockaddr_in6 *)&i1->ip;
226 struct sockaddr_in6 *s2 = (struct sockaddr_in6 *)&i2->ip;
227
228 r = memcmp(&s1->sin6_addr,
229 &s2->sin6_addr,
230 sizeof(struct in6_addr));
231 if (r) {
232 return r;
233 }
234
235 s1 = (struct sockaddr_in6 *)&i1->netmask;
236 s2 = (struct sockaddr_in6 *)&i2->netmask;
237
238 r = memcmp(&s1->sin6_addr,
239 &s2->sin6_addr,
240 sizeof(struct in6_addr));
241 if (r) {
242 return r;
243 }
244 }
245#endif
246
247 /* AIX uses __ss_family instead of ss_family inside of
248 sockaddr_storage. Instead of trying to figure out which field to
249 use, we can just cast it to a sockaddr.
250 */
251
252 if (((struct sockaddr *)&i1->ip)->sa_family == AF_INET) {
253 struct sockaddr_in *s1 = (struct sockaddr_in *)&i1->ip;
254 struct sockaddr_in *s2 = (struct sockaddr_in *)&i2->ip;
255
256 r = ntohl(s1->sin_addr.s_addr) -
257 ntohl(s2->sin_addr.s_addr);
258 if (r) {
259 return r;
260 }
261
262 s1 = (struct sockaddr_in *)&i1->netmask;
263 s2 = (struct sockaddr_in *)&i2->netmask;
264
265 return ntohl(s1->sin_addr.s_addr) -
266 ntohl(s2->sin_addr.s_addr);
267 }
268 return 0;
269}
270
271/* this wrapper is used to remove duplicates from the interface list generated
272 above */
273int get_interfaces(TALLOC_CTX *mem_ctx, struct iface_struct **pifaces)
274{
275 struct iface_struct *ifaces;
276 int total, i, j;
277
278 total = _get_interfaces(mem_ctx, &ifaces);
279 if (total <= 0) return total;
280
281 /* now we need to remove duplicates */
282 qsort(ifaces, total, sizeof(ifaces[0]), QSORT_CAST iface_comp);
283
284 for (i=1;i<total;) {
285 if (iface_comp(&ifaces[i-1], &ifaces[i]) == 0) {
286 for (j=i-1;j<total-1;j++) {
287 ifaces[j] = ifaces[j+1];
288 }
289 total--;
290 } else {
291 i++;
292 }
293 }
294
295 *pifaces = ifaces;
296 return total;
297}
298
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