BIND: update vendor tree to 9.5.2-P2
[dragonfly.git] / contrib / bind / lib / isc / unix / ifiter_sysctl.c
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1/*
2 * Copyright (C) 2004, 2005, 2007 Internet Systems Consortium, Inc. ("ISC")
3 * Copyright (C) 1999-2003 Internet Software Consortium.
4 *
5 * Permission to use, copy, modify, and/or distribute this software for any
6 * purpose with or without fee is hereby granted, provided that the above
7 * copyright notice and this permission notice appear in all copies.
8 *
9 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
10 * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
11 * AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
12 * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
13 * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
14 * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
15 * PERFORMANCE OF THIS SOFTWARE.
16 */
17
18/* $Id: ifiter_sysctl.c,v 1.25 2007/06/19 23:47:18 tbox Exp $ */
19
20/*! \file
21 * \brief
22 * Obtain the list of network interfaces using sysctl.
23 * See TCP/IP Illustrated Volume 2, sections 19.8, 19.14,
24 * and 19.16.
25 */
26
27#include <sys/param.h>
28#include <sys/sysctl.h>
29
30#include <net/route.h>
31#include <net/if_dl.h>
32
33/* XXX what about Alpha? */
34#ifdef sgi
35#define ROUNDUP(a) ((a) > 0 ? \
36 (1 + (((a) - 1) | (sizeof(__uint64_t) - 1))) : \
37 sizeof(__uint64_t))
38#else
39#define ROUNDUP(a) ((a) > 0 ? (1 + (((a) - 1) | (sizeof(long) - 1))) \
40 : sizeof(long))
41#endif
42
43#define IFITER_MAGIC ISC_MAGIC('I', 'F', 'I', 'S')
44#define VALID_IFITER(t) ISC_MAGIC_VALID(t, IFITER_MAGIC)
45
46struct isc_interfaceiter {
47 unsigned int magic; /* Magic number. */
48 isc_mem_t *mctx;
49 void *buf; /* Buffer for sysctl data. */
50 unsigned int bufsize; /* Bytes allocated. */
51 unsigned int bufused; /* Bytes used. */
52 unsigned int pos; /* Current offset in
53 sysctl data. */
54 isc_interface_t current; /* Current interface data. */
55 isc_result_t result; /* Last result code. */
56};
57
58static int mib[6] = {
59 CTL_NET,
60 PF_ROUTE,
61 0,
62 0, /* Any address family. */
63 NET_RT_IFLIST,
64 0 /* Flags. */
65};
66
67isc_result_t
68isc_interfaceiter_create(isc_mem_t *mctx, isc_interfaceiter_t **iterp) {
69 isc_interfaceiter_t *iter;
70 isc_result_t result;
71 size_t bufsize;
72 size_t bufused;
73 char strbuf[ISC_STRERRORSIZE];
74
75 REQUIRE(mctx != NULL);
76 REQUIRE(iterp != NULL);
77 REQUIRE(*iterp == NULL);
78
79 iter = isc_mem_get(mctx, sizeof(*iter));
80 if (iter == NULL)
81 return (ISC_R_NOMEMORY);
82
83 iter->mctx = mctx;
84 iter->buf = 0;
85
86 /*
87 * Determine the amount of memory needed.
88 */
89 bufsize = 0;
90 if (sysctl(mib, 6, NULL, &bufsize, NULL, (size_t) 0) < 0) {
91 isc__strerror(errno, strbuf, sizeof(strbuf));
92 UNEXPECTED_ERROR(__FILE__, __LINE__,
93 isc_msgcat_get(isc_msgcat,
94 ISC_MSGSET_IFITERSYSCTL,
95 ISC_MSG_GETIFLISTSIZE,
96 "getting interface "
97 "list size: sysctl: %s"),
98 strbuf);
99 result = ISC_R_UNEXPECTED;
100 goto failure;
101 }
102 iter->bufsize = bufsize;
103
104 iter->buf = isc_mem_get(iter->mctx, iter->bufsize);
105 if (iter->buf == NULL) {
106 result = ISC_R_NOMEMORY;
107 goto failure;
108 }
109
110 bufused = bufsize;
111 if (sysctl(mib, 6, iter->buf, &bufused, NULL, (size_t) 0) < 0) {
112 isc__strerror(errno, strbuf, sizeof(strbuf));
113 UNEXPECTED_ERROR(__FILE__, __LINE__,
114 isc_msgcat_get(isc_msgcat,
115 ISC_MSGSET_IFITERSYSCTL,
116 ISC_MSG_GETIFLIST,
117 "getting interface list: "
118 "sysctl: %s"),
119 strbuf);
120 result = ISC_R_UNEXPECTED;
121 goto failure;
122 }
123 iter->bufused = bufused;
124 INSIST(iter->bufused <= iter->bufsize);
125
126 /*
127 * A newly created iterator has an undefined position
128 * until isc_interfaceiter_first() is called.
129 */
130 iter->pos = (unsigned int) -1;
131 iter->result = ISC_R_FAILURE;
132
133 iter->magic = IFITER_MAGIC;
134 *iterp = iter;
135 return (ISC_R_SUCCESS);
136
137 failure:
138 if (iter->buf != NULL)
139 isc_mem_put(mctx, iter->buf, iter->bufsize);
140 isc_mem_put(mctx, iter, sizeof(*iter));
141 return (result);
142}
143
144/*
145 * Get information about the current interface to iter->current.
146 * If successful, return ISC_R_SUCCESS.
147 * If the interface has an unsupported address family,
148 * return ISC_R_IGNORE. In case of other failure,
149 * return ISC_R_UNEXPECTED.
150 */
151
152static isc_result_t
153internal_current(isc_interfaceiter_t *iter) {
154 struct ifa_msghdr *ifam, *ifam_end;
155
156 REQUIRE(VALID_IFITER(iter));
157 REQUIRE (iter->pos < (unsigned int) iter->bufused);
158
159 ifam = (struct ifa_msghdr *) ((char *) iter->buf + iter->pos);
160 ifam_end = (struct ifa_msghdr *) ((char *) iter->buf + iter->bufused);
161
162 if (ifam->ifam_type == RTM_IFINFO) {
163 struct if_msghdr *ifm = (struct if_msghdr *) ifam;
164 struct sockaddr_dl *sdl = (struct sockaddr_dl *) (ifm + 1);
165 unsigned int namelen;
166
167 memset(&iter->current, 0, sizeof(iter->current));
168
169 namelen = sdl->sdl_nlen;
170 if (namelen > sizeof(iter->current.name) - 1)
171 namelen = sizeof(iter->current.name) - 1;
172
173 memset(iter->current.name, 0, sizeof(iter->current.name));
174 memcpy(iter->current.name, sdl->sdl_data, namelen);
175
176 iter->current.flags = 0;
177
178 if ((ifam->ifam_flags & IFF_UP) != 0)
179 iter->current.flags |= INTERFACE_F_UP;
180
181 if ((ifam->ifam_flags & IFF_POINTOPOINT) != 0)
182 iter->current.flags |= INTERFACE_F_POINTTOPOINT;
183
184 if ((ifam->ifam_flags & IFF_LOOPBACK) != 0)
185 iter->current.flags |= INTERFACE_F_LOOPBACK;
186
187 /*
188 * This is not an interface address.
189 * Force another iteration.
190 */
191 return (ISC_R_IGNORE);
192 } else if (ifam->ifam_type == RTM_NEWADDR) {
193 int i;
194 int family;
195 struct sockaddr *mask_sa = NULL;
196 struct sockaddr *addr_sa = NULL;
197 struct sockaddr *dst_sa = NULL;
198
199 struct sockaddr *sa = (struct sockaddr *)(ifam + 1);
200 family = sa->sa_family;
201
202 for (i = 0; i < RTAX_MAX; i++)
203 {
204 if ((ifam->ifam_addrs & (1 << i)) == 0)
205 continue;
206
207 INSIST(sa < (struct sockaddr *) ifam_end);
208
209 switch (i) {
210 case RTAX_NETMASK: /* Netmask */
211 mask_sa = sa;
212 break;
213 case RTAX_IFA: /* Interface address */
214 addr_sa = sa;
215 break;
216 case RTAX_BRD: /* Broadcast or destination address */
217 dst_sa = sa;
218 break;
219 }
220#ifdef ISC_PLATFORM_HAVESALEN
221 sa = (struct sockaddr *)((char*)(sa)
222 + ROUNDUP(sa->sa_len));
223#else
224#ifdef sgi
225 /*
226 * Do as the contributed SGI code does.
227 */
228 sa = (struct sockaddr *)((char*)(sa)
229 + ROUNDUP(_FAKE_SA_LEN_DST(sa)));
230#else
231 /* XXX untested. */
232 sa = (struct sockaddr *)((char*)(sa)
233 + ROUNDUP(sizeof(struct sockaddr)));
234#endif
235#endif
236 }
237
238 if (addr_sa == NULL)
239 return (ISC_R_IGNORE);
240
241 family = addr_sa->sa_family;
242 if (family != AF_INET && family != AF_INET6)
243 return (ISC_R_IGNORE);
244
245 iter->current.af = family;
246
247 get_addr(family, &iter->current.address, addr_sa,
248 iter->current.name);
249
250 if (mask_sa != NULL)
251 get_addr(family, &iter->current.netmask, mask_sa,
252 iter->current.name);
253
254 if (dst_sa != NULL &&
255 (iter->current.flags & INTERFACE_F_POINTTOPOINT) != 0)
256 get_addr(family, &iter->current.dstaddress, dst_sa,
257 iter->current.name);
258
259 return (ISC_R_SUCCESS);
260 } else {
261 printf(isc_msgcat_get(isc_msgcat, ISC_MSGSET_IFITERSYSCTL,
262 ISC_MSG_UNEXPECTEDTYPE,
263 "warning: unexpected interface list "
264 "message type\n"));
265 return (ISC_R_IGNORE);
266 }
267}
268
269/*
270 * Step the iterator to the next interface. Unlike
271 * isc_interfaceiter_next(), this may leave the iterator
272 * positioned on an interface that will ultimately
273 * be ignored. Return ISC_R_NOMORE if there are no more
274 * interfaces, otherwise ISC_R_SUCCESS.
275 */
276static isc_result_t
277internal_next(isc_interfaceiter_t *iter) {
278 struct ifa_msghdr *ifam;
279 REQUIRE (iter->pos < (unsigned int) iter->bufused);
280
281 ifam = (struct ifa_msghdr *) ((char *) iter->buf + iter->pos);
282
283 iter->pos += ifam->ifam_msglen;
284
285 if (iter->pos >= iter->bufused)
286 return (ISC_R_NOMORE);
287
288 return (ISC_R_SUCCESS);
289}
290
291static void
292internal_destroy(isc_interfaceiter_t *iter) {
293 UNUSED(iter); /* Unused. */
294 /*
295 * Do nothing.
296 */
297}
298
299static
300void internal_first(isc_interfaceiter_t *iter) {
301 iter->pos = 0;
302}