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Diffstat (limited to 'src/lib/libc/net/getifaddrs.c')
-rw-r--r--src/lib/libc/net/getifaddrs.c284
1 files changed, 284 insertions, 0 deletions
diff --git a/src/lib/libc/net/getifaddrs.c b/src/lib/libc/net/getifaddrs.c
new file mode 100644
index 0000000000..6f7ea15721
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+++ b/src/lib/libc/net/getifaddrs.c
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1/* $OpenBSD: getifaddrs.c,v 1.10 2008/11/24 20:08:49 claudio Exp $ */
2
3/*
4 * Copyright (c) 1995, 1999
5 * Berkeley Software Design, Inc. All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 *
13 * THIS SOFTWARE IS PROVIDED BY Berkeley Software Design, Inc. ``AS IS'' AND
14 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
16 * ARE DISCLAIMED. IN NO EVENT SHALL Berkeley Software Design, Inc. BE LIABLE
17 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
18 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
19 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
20 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
21 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
22 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
23 * SUCH DAMAGE.
24 *
25 * BSDI getifaddrs.c,v 2.12 2000/02/23 14:51:59 dab Exp
26 */
27
28#include <sys/types.h>
29#include <sys/ioctl.h>
30#include <sys/socket.h>
31#include <net/if.h>
32#include <sys/param.h>
33#include <net/route.h>
34#include <sys/sysctl.h>
35#include <net/if_dl.h>
36
37#include <errno.h>
38#include <ifaddrs.h>
39#include <stddef.h>
40#include <stdlib.h>
41#include <string.h>
42#include <unistd.h>
43
44#define SALIGN (sizeof(long) - 1)
45#define SA_RLEN(sa) ((sa)->sa_len ? (((sa)->sa_len + SALIGN) & ~SALIGN) : (SALIGN + 1))
46
47int
48getifaddrs(struct ifaddrs **pif)
49{
50 int icnt = 1;
51 int dcnt = 0;
52 int ncnt = 0;
53 int mib[6];
54 size_t needed;
55 char *buf;
56 char *next;
57 struct ifaddrs *cif = 0;
58 char *p, *p0;
59 struct rt_msghdr *rtm;
60 struct if_msghdr *ifm;
61 struct ifa_msghdr *ifam;
62 struct sockaddr_dl *dl;
63 struct sockaddr *sa;
64 u_short index = 0;
65 size_t len, alen, dlen;
66 struct ifaddrs *ifa, *ift;
67 int i;
68 char *data;
69 char *names;
70
71 mib[0] = CTL_NET;
72 mib[1] = PF_ROUTE;
73 mib[2] = 0; /* protocol */
74 mib[3] = 0; /* wildcard address family */
75 mib[4] = NET_RT_IFLIST;
76 mib[5] = 0; /* no flags */
77 if (sysctl(mib, 6, NULL, &needed, NULL, 0) < 0)
78 return (-1);
79 if ((buf = malloc(needed)) == NULL)
80 return (-1);
81 if (sysctl(mib, 6, buf, &needed, NULL, 0) < 0) {
82 free(buf);
83 return (-1);
84 }
85
86 for (next = buf; next < buf + needed; next += rtm->rtm_msglen) {
87 rtm = (struct rt_msghdr *)next;
88 if (rtm->rtm_version != RTM_VERSION)
89 continue;
90 switch (rtm->rtm_type) {
91 case RTM_IFINFO:
92 ifm = (struct if_msghdr *)rtm;
93 if (ifm->ifm_addrs & RTA_IFP) {
94 index = ifm->ifm_index;
95 ++icnt;
96 dl = (struct sockaddr_dl *)(next +
97 rtm->rtm_hdrlen);
98 dcnt += SA_RLEN((struct sockaddr *)dl) +
99 ALIGNBYTES;
100 dcnt += sizeof(ifm->ifm_data);
101 ncnt += dl->sdl_nlen + 1;
102 } else
103 index = 0;
104 break;
105
106 case RTM_NEWADDR:
107 ifam = (struct ifa_msghdr *)rtm;
108 if (index && ifam->ifam_index != index)
109 abort(); /* XXX abort illegal in library */
110
111#define RTA_MASKS (RTA_NETMASK | RTA_IFA | RTA_BRD)
112 if (index == 0 || (ifam->ifam_addrs & RTA_MASKS) == 0)
113 break;
114 p = next + rtm->rtm_hdrlen;
115 ++icnt;
116 /* Scan to look for length of address */
117 alen = 0;
118 for (p0 = p, i = 0; i < RTAX_MAX; i++) {
119 if ((RTA_MASKS & ifam->ifam_addrs & (1 << i))
120 == 0)
121 continue;
122 sa = (struct sockaddr *)p;
123 len = SA_RLEN(sa);
124 if (i == RTAX_IFA) {
125 alen = len;
126 break;
127 }
128 p += len;
129 }
130 for (p = p0, i = 0; i < RTAX_MAX; i++) {
131 if ((RTA_MASKS & ifam->ifam_addrs & (1 << i))
132 == 0)
133 continue;
134 sa = (struct sockaddr *)p;
135 len = SA_RLEN(sa);
136 if (i == RTAX_NETMASK && sa->sa_len == 0)
137 dcnt += alen;
138 else
139 dcnt += len;
140 p += len;
141 }
142 break;
143 }
144 }
145
146 if (icnt + dcnt + ncnt == 1) {
147 *pif = NULL;
148 free(buf);
149 return (0);
150 }
151 data = malloc(sizeof(struct ifaddrs) * icnt + dcnt + ncnt);
152 if (data == NULL) {
153 free(buf);
154 return(-1);
155 }
156
157 ifa = (struct ifaddrs *)data;
158 data += sizeof(struct ifaddrs) * icnt;
159 names = data + dcnt;
160
161 memset(ifa, 0, sizeof(struct ifaddrs) * icnt);
162 ift = ifa;
163
164 index = 0;
165 for (next = buf; next < buf + needed; next += rtm->rtm_msglen) {
166 rtm = (struct rt_msghdr *)next;
167 if (rtm->rtm_version != RTM_VERSION)
168 continue;
169 switch (rtm->rtm_type) {
170 case RTM_IFINFO:
171 ifm = (struct if_msghdr *)rtm;
172 if (ifm->ifm_addrs & RTA_IFP) {
173 index = ifm->ifm_index;
174 dl = (struct sockaddr_dl *)(next +
175 rtm->rtm_hdrlen);
176
177 cif = ift;
178 ift->ifa_name = names;
179 ift->ifa_flags = (int)ifm->ifm_flags;
180 memcpy(names, dl->sdl_data, dl->sdl_nlen);
181 names[dl->sdl_nlen] = 0;
182 names += dl->sdl_nlen + 1;
183
184 ift->ifa_addr = (struct sockaddr *)data;
185 memcpy(data, dl,
186 ((struct sockaddr *)dl)->sa_len);
187 data += SA_RLEN((struct sockaddr *)dl);
188
189 /* ifm_data needs to be aligned */
190 ift->ifa_data = data = (void *)ALIGN(data);
191 dlen = rtm->rtm_hdrlen -
192 offsetof(struct if_msghdr, ifm_data);
193 if (dlen > sizeof(ifm->ifm_data))
194 dlen = sizeof(ifm->ifm_data);
195 memcpy(data, &ifm->ifm_data, dlen);
196 data += sizeof(ifm->ifm_data);
197
198 ift = (ift->ifa_next = ift + 1);
199 } else
200 index = 0;
201 break;
202
203 case RTM_NEWADDR:
204 ifam = (struct ifa_msghdr *)rtm;
205 if (index && ifam->ifam_index != index)
206 abort(); /* XXX abort illegal in library */
207
208 if (index == 0 || (ifam->ifam_addrs & RTA_MASKS) == 0)
209 break;
210 ift->ifa_name = cif->ifa_name;
211 ift->ifa_flags = cif->ifa_flags;
212 ift->ifa_data = NULL;
213 p = next + rtm->rtm_hdrlen;
214 /* Scan to look for length of address */
215 alen = 0;
216 for (p0 = p, i = 0; i < RTAX_MAX; i++) {
217 if ((RTA_MASKS & ifam->ifam_addrs & (1 << i))
218 == 0)
219 continue;
220 sa = (struct sockaddr *)p;
221 len = SA_RLEN(sa);
222 if (i == RTAX_IFA) {
223 alen = len;
224 break;
225 }
226 p += len;
227 }
228 for (p = p0, i = 0; i < RTAX_MAX; i++) {
229 if ((RTA_MASKS & ifam->ifam_addrs & (1 << i))
230 == 0)
231 continue;
232 sa = (struct sockaddr *)p;
233 len = SA_RLEN(sa);
234 switch (i) {
235 case RTAX_IFA:
236 ift->ifa_addr = (struct sockaddr *)data;
237 memcpy(data, p, len);
238 data += len;
239 break;
240
241 case RTAX_NETMASK:
242 ift->ifa_netmask =
243 (struct sockaddr *)data;
244 if (sa->sa_len == 0) {
245 memset(data, 0, alen);
246 data += alen;
247 break;
248 }
249 memcpy(data, p, len);
250 data += len;
251 break;
252
253 case RTAX_BRD:
254 ift->ifa_broadaddr =
255 (struct sockaddr *)data;
256 memcpy(data, p, len);
257 data += len;
258 break;
259 }
260 p += len;
261 }
262
263
264 ift = (ift->ifa_next = ift + 1);
265 break;
266 }
267 }
268
269 free(buf);
270 if (--ift >= ifa) {
271 ift->ifa_next = NULL;
272 *pif = ifa;
273 } else {
274 *pif = NULL;
275 free(ifa);
276 }
277 return (0);
278}
279
280void
281freeifaddrs(struct ifaddrs *ifp)
282{
283 free(ifp);
284}
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