1/*
2 * Copyright (c) 2000 - 2001 Kungliga Tekniska H�gskolan
3 * (Royal Institute of Technology, Stockholm, Sweden).
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 *
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 *
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 *
17 * 3. Neither the name of the Institute nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34#ifdef HAVE_CONFIG_H
35#include <config.h>
36RCSID("$Id: getifaddrs.c,v 1.7 2001/11/30 03:27:30 assar Exp $");
37#endif
38#include "roken.h"
39
40#ifdef __osf__
41/* hate */
42struct rtentry;
43struct mbuf;
44#endif
45#ifdef HAVE_NET_IF_H
46#include <net/if.h>
47#endif
48
49#ifdef HAVE_SYS_SOCKIO_H
50#include <sys/sockio.h>
51#endif /* HAVE_SYS_SOCKIO_H */
52
53#ifdef HAVE_NETINET_IN6_VAR_H
54#include <netinet/in6_var.h>
55#endif /* HAVE_NETINET_IN6_VAR_H */
56
57#include <ifaddrs.h>
58
59static int
60getifaddrs2(struct ifaddrs **ifap,
61 int af, int siocgifconf, int siocgifflags,
62 size_t ifreq_sz)
63{
64 int ret;
65 int fd;
66 size_t buf_size;
67 char *buf;
68 struct ifconf ifconf;
69 char *p;
70 size_t sz;
71 struct sockaddr sa_zero;
72 struct ifreq *ifr;
73 struct ifaddrs *start = NULL, **end = &start;
74
75 buf = NULL;
76
77 memset (&sa_zero, 0, sizeof(sa_zero));
78 fd = socket(af, SOCK_DGRAM, 0);
79 if (fd < 0)
80 return -1;
81
82 buf_size = 8192;
83 for (;;) {
84 buf = calloc(1, buf_size);
85 if (buf == NULL) {
86 ret = ENOMEM;
87 goto error_out;
88 }
89 ifconf.ifc_len = buf_size;
90 ifconf.ifc_buf = buf;
91
92 /*
93 * Solaris returns EINVAL when the buffer is too small.
94 */
95 if (ioctl (fd, siocgifconf, &ifconf) < 0 && errno != EINVAL) {
96 ret = errno;
97 goto error_out;
98 }
99 /*
100 * Can the difference between a full and a overfull buf
101 * be determined?
102 */
103
104 if (ifconf.ifc_len < buf_size)
105 break;
106 free (buf);
107 buf_size *= 2;
108 }
109
110 for (p = ifconf.ifc_buf;
111 p < ifconf.ifc_buf + ifconf.ifc_len;
112 p += sz) {
113 struct ifreq ifreq;
114 struct sockaddr *sa;
115 size_t salen;
116
117 ifr = (struct ifreq *)p;
118 sa = &ifr->ifr_addr;
119
120 sz = ifreq_sz;
121 salen = sizeof(struct sockaddr);
122#ifdef HAVE_STRUCT_SOCKADDR_SA_LEN
123 salen = sa->sa_len;
124 sz = max(sz, sizeof(ifr->ifr_name) + sa->sa_len);
125#endif
126#ifdef SA_LEN
127 salen = SA_LEN(sa);
128 sz = max(sz, sizeof(ifr->ifr_name) + SA_LEN(sa));
129#endif
130 memset (&ifreq, 0, sizeof(ifreq));
131 memcpy (ifreq.ifr_name, ifr->ifr_name, sizeof(ifr->ifr_name));
132
133 if (ioctl(fd, siocgifflags, &ifreq) < 0) {
134 ret = errno;
135 goto error_out;
136 }
137
138 *end = malloc(sizeof(**end));
139 if (*end == NULL) {
140 ret = ENOMEM;
141 goto error_out;
142 }
143
144 (*end)->ifa_next = NULL;
145 (*end)->ifa_name = strdup(ifr->ifr_name);
146 (*end)->ifa_flags = ifreq.ifr_flags;
147 (*end)->ifa_addr = malloc(salen);
148 memcpy((*end)->ifa_addr, sa, salen);
149 (*end)->ifa_netmask = NULL;
150
151#if 0
152 /* fix these when we actually need them */
153 if(ifreq.ifr_flags & IFF_BROADCAST) {
154 (*end)->ifa_broadaddr = malloc(sizeof(ifr->ifr_broadaddr));
155 memcpy((*end)->ifa_broadaddr, &ifr->ifr_broadaddr,
156 sizeof(ifr->ifr_broadaddr));
157 } else if(ifreq.ifr_flags & IFF_POINTOPOINT) {
158 (*end)->ifa_dstaddr = malloc(sizeof(ifr->ifr_dstaddr));
159 memcpy((*end)->ifa_dstaddr, &ifr->ifr_dstaddr,
160 sizeof(ifr->ifr_dstaddr));
161 } else
162 (*end)->ifa_dstaddr = NULL;
163#else
164 (*end)->ifa_dstaddr = NULL;
165#endif
166
167 (*end)->ifa_data = NULL;
168
169 end = &(*end)->ifa_next;
170
171 }
172 *ifap = start;
173 close(fd);
174 free(buf);
175 return 0;
176 error_out:
177 freeifaddrs(start);
178 close(fd);
179 free(buf);
180 errno = ret;
181 return -1;
182}
183
184#if defined(HAVE_IPV6) && defined(SIOCGLIFCONF) && defined(SIOCGLIFFLAGS)
185static int
186getlifaddrs2(struct ifaddrs **ifap,
187 int af, int siocgifconf, int siocgifflags,
188 size_t ifreq_sz)
189{
190 int ret;
191 int fd;
192 size_t buf_size;
193 char *buf;
194 struct lifconf ifconf;
195 char *p;
196 size_t sz;
197 struct sockaddr sa_zero;
198 struct lifreq *ifr;
199 struct ifaddrs *start = NULL, **end = &start;
200
201 buf = NULL;
202
203 memset (&sa_zero, 0, sizeof(sa_zero));
204 fd = socket(af, SOCK_DGRAM, 0);
205 if (fd < 0)
206 return -1;
207
208 buf_size = 8192;
209 for (;;) {
210 buf = calloc(1, buf_size);
211 if (buf == NULL) {
212 ret = ENOMEM;
213 goto error_out;
214 }
215 ifconf.lifc_family = AF_UNSPEC;
216 ifconf.lifc_flags = 0;
217 ifconf.lifc_len = buf_size;
218 ifconf.lifc_buf = buf;
219
220 /*
221 * Solaris returns EINVAL when the buffer is too small.
222 */
223 if (ioctl (fd, siocgifconf, &ifconf) < 0 && errno != EINVAL) {
224 ret = errno;
225 goto error_out;
226 }
227 /*
228 * Can the difference between a full and a overfull buf
229 * be determined?
230 */
231
232 if (ifconf.lifc_len < buf_size)
233 break;
234 free (buf);
235 buf_size *= 2;
236 }
237
238 for (p = ifconf.lifc_buf;
239 p < ifconf.lifc_buf + ifconf.lifc_len;
240 p += sz) {
241 struct lifreq ifreq;
242 struct sockaddr_storage *sa;
243 size_t salen;
244
245 ifr = (struct lifreq *)p;
246 sa = &ifr->lifr_addr;
247
248 sz = ifreq_sz;
249 salen = sizeof(struct sockaddr_storage);
250#ifdef HAVE_STRUCT_SOCKADDR_SA_LEN
251 salen = sa->sa_len;
252 sz = max(sz, sizeof(ifr->ifr_name) + sa->sa_len);
253#endif
254#ifdef SA_LEN
255 salen = SA_LEN(sa);
256 sz = max(sz, sizeof(ifr->ifr_name) + SA_LEN(sa));
257#endif
258 memset (&ifreq, 0, sizeof(ifreq));
259 memcpy (ifreq.lifr_name, ifr->lifr_name, sizeof(ifr->lifr_name));
260
261 if (ioctl(fd, siocgifflags, &ifreq) < 0) {
262 ret = errno;
263 goto error_out;
264 }
265
266 *end = malloc(sizeof(**end));
267
268 (*end)->ifa_next = NULL;
269 (*end)->ifa_name = strdup(ifr->lifr_name);
270 (*end)->ifa_flags = ifreq.lifr_flags;
271 (*end)->ifa_addr = malloc(salen);
272 memcpy((*end)->ifa_addr, sa, salen);
273 (*end)->ifa_netmask = NULL;
274
275#if 0
276 /* fix these when we actually need them */
277 if(ifreq.ifr_flags & IFF_BROADCAST) {
278 (*end)->ifa_broadaddr = malloc(sizeof(ifr->ifr_broadaddr));
279 memcpy((*end)->ifa_broadaddr, &ifr->ifr_broadaddr,
280 sizeof(ifr->ifr_broadaddr));
281 } else if(ifreq.ifr_flags & IFF_POINTOPOINT) {
282 (*end)->ifa_dstaddr = malloc(sizeof(ifr->ifr_dstaddr));
283 memcpy((*end)->ifa_dstaddr, &ifr->ifr_dstaddr,
284 sizeof(ifr->ifr_dstaddr));
285 } else
286 (*end)->ifa_dstaddr = NULL;
287#else
288 (*end)->ifa_dstaddr = NULL;
289#endif
290
291 (*end)->ifa_data = NULL;
292
293 end = &(*end)->ifa_next;
294
295 }
296 *ifap = start;
297 close(fd);
298 free(buf);
299 return 0;
300 error_out:
301 freeifaddrs(start);
302 close(fd);
303 free(buf);
304 errno = ret;
305 return -1;
306}
307#endif /* defined(HAVE_IPV6) && defined(SIOCGLIFCONF) && defined(SIOCGLIFFLAGS) */
308
309int
310getifaddrs(struct ifaddrs **ifap)
311{
312 int ret = -1;
313 errno = ENXIO;
314#if defined(AF_INET6) && defined(SIOCGIF6CONF) && defined(SIOCGIF6FLAGS)
315 if (ret)
316 ret = getifaddrs2 (ifap, AF_INET6, SIOCGIF6CONF, SIOCGIF6FLAGS,
317 sizeof(struct in6_ifreq));
318#endif
319#if defined(HAVE_IPV6) && defined(SIOCGLIFCONF) && defined(SIOCGLIFFLAGS)
320 if (ret)
321 ret = getlifaddrs2 (ifap, AF_INET6, SIOCGLIFCONF, SIOCGLIFFLAGS,
322 sizeof(struct lifreq));
323#endif
324#if defined(HAVE_IPV6) && defined(SIOCGIFCONF)
325 if (ret)
326 ret = getifaddrs2 (ifap, AF_INET6, SIOCGIFCONF, SIOCGIFFLAGS,
327 sizeof(struct ifreq));
328#endif
329#if defined(AF_INET) && defined(SIOCGIFCONF) && defined(SIOCGIFFLAGS)
330 if (ret)
331 ret = getifaddrs2 (ifap, AF_INET, SIOCGIFCONF, SIOCGIFFLAGS,
332 sizeof(struct ifreq));
333#endif
334 return ret;
335}
336
337void
338freeifaddrs(struct ifaddrs *ifp)
339{
340 struct ifaddrs *p, *q;
341
342 for(p = ifp; p; ) {
343 free(p->ifa_name);
344 if(p->ifa_addr)
345 free(p->ifa_addr);
346 if(p->ifa_dstaddr)
347 free(p->ifa_dstaddr);
348 if(p->ifa_netmask)
349 free(p->ifa_netmask);
350 if(p->ifa_data)
351 free(p->ifa_data);
352 q = p;
353 p = p->ifa_next;
354 free(q);
355 }
356}
357
358#ifdef TEST
359
360void
361print_addr(const char *s, struct sockaddr *sa)
362{
363 int i;
364 printf(" %s=%d/", s, sa->sa_family);
365#ifdef HAVE_STRUCT_SOCKADDR_SA_LEN
366 for(i = 0; i < sa->sa_len - ((long)sa->sa_data - (long)&sa->sa_family); i++)
367 printf("%02x", ((unsigned char*)sa->sa_data)[i]);
368#else
369 for(i = 0; i < sizeof(sa->sa_data); i++)
370 printf("%02x", ((unsigned char*)sa->sa_data)[i]);
371#endif
372 printf("\n");
373}
374
375void
376print_ifaddrs(struct ifaddrs *x)
377{
378 struct ifaddrs *p;
379
380 for(p = x; p; p = p->ifa_next) {
381 printf("%s\n", p->ifa_name);
382 printf(" flags=%x\n", p->ifa_flags);
383 if(p->ifa_addr)
384 print_addr("addr", p->ifa_addr);
385 if(p->ifa_dstaddr)
386 print_addr("dstaddr", p->ifa_dstaddr);
387 if(p->ifa_netmask)
388 print_addr("netmask", p->ifa_netmask);
389 printf(" %p\n", p->ifa_data);
390 }
391}
392
393int
394main()
395{
396 struct ifaddrs *a = NULL, *b;
397 getifaddrs2(&a, AF_INET, SIOCGIFCONF, SIOCGIFFLAGS, sizeof(struct ifreq));
398 print_ifaddrs(a);
399 printf("---\n");
400 getifaddrs(&b);
401 print_ifaddrs(b);
402 return 0;
403}
404#endif