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[netbsd-mini2440.git] / external / bsd / bind / dist / lib / isc / netaddr.c
blob47a7d5458abf97b126e93bd82c970d70c0e8470b
1 /* $NetBSD$ */
2
3 /*
4 * Copyright (C) 2004, 2005, 2007 Internet Systems Consortium, Inc. ("ISC")
5 * Copyright (C) 1999-2002 Internet Software Consortium.
6 *
7 * Permission to use, copy, modify, and/or distribute this software for any
8 * purpose with or without fee is hereby granted, provided that the above
9 * copyright notice and this permission notice appear in all copies.
10 *
11 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
12 * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
13 * AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
14 * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
15 * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
16 * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
17 * PERFORMANCE OF THIS SOFTWARE.
18 */
19
20 /* Id: netaddr.c,v 1.38 2007/06/18 23:47:44 tbox Exp */
21
22 /*! \file */
23
24 #include <config.h>
25
26 #include <stdio.h>
27
28 #include <isc/buffer.h>
29 #include <isc/msgs.h>
30 #include <isc/net.h>
31 #include <isc/netaddr.h>
32 #include <isc/print.h>
33 #include <isc/sockaddr.h>
34 #include <isc/string.h>
35 #include <isc/util.h>
36
37 isc_boolean_t
38 isc_netaddr_equal(const isc_netaddr_t *a, const isc_netaddr_t *b) {
39 REQUIRE(a != NULL && b != NULL);
40
41 if (a->family != b->family)
42 return (ISC_FALSE);
43
44 if (a->zone != b->zone)
45 return (ISC_FALSE);
46
47 switch (a->family) {
48 case AF_INET:
49 if (a->type.in.s_addr != b->type.in.s_addr)
50 return (ISC_FALSE);
51 break;
52 case AF_INET6:
53 if (memcmp(&a->type.in6, &b->type.in6,
54 sizeof(a->type.in6)) != 0 ||
55 a->zone != b->zone)
56 return (ISC_FALSE);
57 break;
58 #ifdef ISC_PLATFORM_HAVESYSUNH
59 case AF_UNIX:
60 if (strcmp(a->type.un, b->type.un) != 0)
61 return (ISC_FALSE);
62 break;
63 #endif
64 default:
65 return (ISC_FALSE);
66 }
67 return (ISC_TRUE);
68 }
69
70 isc_boolean_t
71 isc_netaddr_eqprefix(const isc_netaddr_t *a, const isc_netaddr_t *b,
72 unsigned int prefixlen)
73 {
74 const unsigned char *pa, *pb;
75 unsigned int ipabytes; /* Length of whole IP address in bytes */
76 unsigned int nbytes; /* Number of significant whole bytes */
77 unsigned int nbits; /* Number of significant leftover bits */
78
79 REQUIRE(a != NULL && b != NULL);
80
81 if (a->family != b->family)
82 return (ISC_FALSE);
83
84 if (a->zone != b->zone && b->zone != 0)
85 return (ISC_FALSE);
86
87 switch (a->family) {
88 case AF_INET:
89 pa = (const unsigned char *) &a->type.in;
90 pb = (const unsigned char *) &b->type.in;
91 ipabytes = 4;
92 break;
93 case AF_INET6:
94 pa = (const unsigned char *) &a->type.in6;
95 pb = (const unsigned char *) &b->type.in6;
96 ipabytes = 16;
97 break;
98 default:
99 pa = pb = NULL; /* Avoid silly compiler warning. */
100 ipabytes = 0; /* Ditto. */
101 return (ISC_FALSE);
102 }
103
104 /*
105 * Don't crash if we get a pattern like 10.0.0.1/9999999.
106 */
107 if (prefixlen > ipabytes * 8)
108 prefixlen = ipabytes * 8;
109
110 nbytes = prefixlen / 8;
111 nbits = prefixlen % 8;
112
113 if (nbytes > 0) {
114 if (memcmp(pa, pb, nbytes) != 0)
115 return (ISC_FALSE);
116 }
117 if (nbits > 0) {
118 unsigned int bytea, byteb, mask;
119 INSIST(nbytes < ipabytes);
120 INSIST(nbits < 8);
121 bytea = pa[nbytes];
122 byteb = pb[nbytes];
123 mask = (0xFF << (8-nbits)) & 0xFF;
124 if ((bytea & mask) != (byteb & mask))
125 return (ISC_FALSE);
126 }
127 return (ISC_TRUE);
128 }
129
130 isc_result_t
131 isc_netaddr_totext(const isc_netaddr_t *netaddr, isc_buffer_t *target) {
132 char abuf[sizeof("xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255")];
133 char zbuf[sizeof("%4294967295")];
134 unsigned int alen;
135 int zlen;
136 const char *r;
137 const void *type;
138
139 REQUIRE(netaddr != NULL);
140
141 switch (netaddr->family) {
142 case AF_INET:
143 type = &netaddr->type.in;
144 break;
145 case AF_INET6:
146 type = &netaddr->type.in6;
147 break;
148 #ifdef ISC_PLATFORM_HAVESYSUNH
149 case AF_UNIX:
150 alen = strlen(netaddr->type.un);
151 if (alen > isc_buffer_availablelength(target))
152 return (ISC_R_NOSPACE);
153 isc_buffer_putmem(target,
154 (const unsigned char *)(netaddr->type.un),
155 alen);
156 return (ISC_R_SUCCESS);
157 #endif
158 default:
159 return (ISC_R_FAILURE);
160 }
161 r = inet_ntop(netaddr->family, type, abuf, sizeof(abuf));
162 if (r == NULL)
163 return (ISC_R_FAILURE);
164
165 alen = strlen(abuf);
166 INSIST(alen < sizeof(abuf));
167
168 zlen = 0;
169 if (netaddr->family == AF_INET6 && netaddr->zone != 0) {
170 zlen = snprintf(zbuf, sizeof(zbuf), "%%%u", netaddr->zone);
171 if (zlen < 0)
172 return (ISC_R_FAILURE);
173 INSIST((unsigned int)zlen < sizeof(zbuf));
174 }
175
176 if (alen + zlen > isc_buffer_availablelength(target))
177 return (ISC_R_NOSPACE);
178
179 isc_buffer_putmem(target, (unsigned char *)abuf, alen);
180 isc_buffer_putmem(target, (unsigned char *)zbuf, zlen);
181
182 return (ISC_R_SUCCESS);
183 }
184
185 void
186 isc_netaddr_format(const isc_netaddr_t *na, char *array, unsigned int size) {
187 isc_result_t result;
188 isc_buffer_t buf;
189
190 isc_buffer_init(&buf, array, size);
191 result = isc_netaddr_totext(na, &buf);
192
193 /*
194 * Null terminate.
195 */
196 if (result == ISC_R_SUCCESS) {
197 if (isc_buffer_availablelength(&buf) >= 1)
198 isc_buffer_putuint8(&buf, 0);
199 else
200 result = ISC_R_NOSPACE;
201 }
202
203 if (result != ISC_R_SUCCESS) {
204 snprintf(array, size,
205 isc_msgcat_get(isc_msgcat, ISC_MSGSET_NETADDR,
206 ISC_MSG_UNKNOWNADDR,
207 "<unknown address, family %u>"),
208 na->family);
209 array[size - 1] = '\0';
210 }
211 }
212
213
214 isc_result_t
215 isc_netaddr_prefixok(const isc_netaddr_t *na, unsigned int prefixlen) {
216 static const unsigned char zeros[16];
217 unsigned int nbits, nbytes, ipbytes;
218 const unsigned char *p;
219
220 switch (na->family) {
221 case AF_INET:
222 p = (const unsigned char *) &na->type.in;
223 ipbytes = 4;
224 if (prefixlen > 32)
225 return (ISC_R_RANGE);
226 break;
227 case AF_INET6:
228 p = (const unsigned char *) &na->type.in6;
229 ipbytes = 16;
230 if (prefixlen > 128)
231 return (ISC_R_RANGE);
232 break;
233 default:
234 ipbytes = 0;
235 return (ISC_R_NOTIMPLEMENTED);
236 }
237 nbytes = prefixlen / 8;
238 nbits = prefixlen % 8;
239 if (nbits != 0) {
240 if ((p[nbytes] & (0xff>>nbits)) != 0U)
241 return (ISC_R_FAILURE);
242 nbytes++;
243 }
244 if (memcmp(p + nbytes, zeros, ipbytes - nbytes) != 0)
245 return (ISC_R_FAILURE);
246 return (ISC_R_SUCCESS);
247 }
248
249 isc_result_t
250 isc_netaddr_masktoprefixlen(const isc_netaddr_t *s, unsigned int *lenp) {
251 unsigned int nbits, nbytes, ipbytes, i;
252 const unsigned char *p;
253
254 switch (s->family) {
255 case AF_INET:
256 p = (const unsigned char *) &s->type.in;
257 ipbytes = 4;
258 break;
259 case AF_INET6:
260 p = (const unsigned char *) &s->type.in6;
261 ipbytes = 16;
262 break;
263 default:
264 ipbytes = 0;
265 return (ISC_R_NOTIMPLEMENTED);
266 }
267 nbytes = nbits = 0;
268 for (i = 0; i < ipbytes; i++) {
269 if (p[i] != 0xFF)
270 break;
271 }
272 nbytes = i;
273 if (i < ipbytes) {
274 unsigned int c = p[nbytes];
275 while ((c & 0x80) != 0 && nbits < 8) {
276 c <<= 1; nbits++;
277 }
278 if ((c & 0xFF) != 0)
279 return (ISC_R_MASKNONCONTIG);
280 i++;
281 }
282 for (; i < ipbytes; i++) {
283 if (p[i] != 0)
284 return (ISC_R_MASKNONCONTIG);
285 i++;
286 }
287 *lenp = nbytes * 8 + nbits;
288 return (ISC_R_SUCCESS);
289 }
290
291 void
292 isc_netaddr_fromin(isc_netaddr_t *netaddr, const struct in_addr *ina) {
293 memset(netaddr, 0, sizeof(*netaddr));
294 netaddr->family = AF_INET;
295 netaddr->type.in = *ina;
296 }
297
298 void
299 isc_netaddr_fromin6(isc_netaddr_t *netaddr, const struct in6_addr *ina6) {
300 memset(netaddr, 0, sizeof(*netaddr));
301 netaddr->family = AF_INET6;
302 netaddr->type.in6 = *ina6;
303 }
304
305 isc_result_t
306 isc_netaddr_frompath(isc_netaddr_t *netaddr, const char *path) {
307 #ifdef ISC_PLATFORM_HAVESYSUNH
308 if (strlen(path) > sizeof(netaddr->type.un) - 1)
309 return (ISC_R_NOSPACE);
310
311 memset(netaddr, 0, sizeof(*netaddr));
312 netaddr->family = AF_UNIX;
313 strcpy(netaddr->type.un, path);
314 netaddr->zone = 0;
315 return (ISC_R_SUCCESS);
316 #else
317 UNUSED(netaddr);
318 UNUSED(path);
319 return (ISC_R_NOTIMPLEMENTED);
320 #endif
321 }
322
323
324 void
325 isc_netaddr_setzone(isc_netaddr_t *netaddr, isc_uint32_t zone) {
326 /* we currently only support AF_INET6. */
327 REQUIRE(netaddr->family == AF_INET6);
328
329 netaddr->zone = zone;
330 }
331
332 isc_uint32_t
333 isc_netaddr_getzone(const isc_netaddr_t *netaddr) {
334 return (netaddr->zone);
335 }
336
337 void
338 isc_netaddr_fromsockaddr(isc_netaddr_t *t, const isc_sockaddr_t *s) {
339 int family = s->type.sa.sa_family;
340 t->family = family;
341 switch (family) {
342 case AF_INET:
343 t->type.in = s->type.sin.sin_addr;
344 t->zone = 0;
345 break;
346 case AF_INET6:
347 memcpy(&t->type.in6, &s->type.sin6.sin6_addr, 16);
348 #ifdef ISC_PLATFORM_HAVESCOPEID
349 t->zone = s->type.sin6.sin6_scope_id;
350 #else
351 t->zone = 0;
352 #endif
353 break;
354 #ifdef ISC_PLATFORM_HAVESYSUNH
355 case AF_UNIX:
356 memcpy(t->type.un, s->type.sunix.sun_path, sizeof(t->type.un));
357 t->zone = 0;
358 break;
359 #endif
360 default:
361 INSIST(0);
362 }
363 }
364
365 void
366 isc_netaddr_any(isc_netaddr_t *netaddr) {
367 memset(netaddr, 0, sizeof(*netaddr));
368 netaddr->family = AF_INET;
369 netaddr->type.in.s_addr = INADDR_ANY;
370 }
371
372 void
373 isc_netaddr_any6(isc_netaddr_t *netaddr) {
374 memset(netaddr, 0, sizeof(*netaddr));
375 netaddr->family = AF_INET6;
376 netaddr->type.in6 = in6addr_any;
377 }
378
379 isc_boolean_t
380 isc_netaddr_ismulticast(isc_netaddr_t *na) {
381 switch (na->family) {
382 case AF_INET:
383 return (ISC_TF(ISC_IPADDR_ISMULTICAST(na->type.in.s_addr)));
384 case AF_INET6:
385 return (ISC_TF(IN6_IS_ADDR_MULTICAST(&na->type.in6)));
386 default:
387 return (ISC_FALSE); /* XXXMLG ? */
388 }
389 }
390
391 isc_boolean_t
392 isc_netaddr_isexperimental(isc_netaddr_t *na) {
393 switch (na->family) {
394 case AF_INET:
395 return (ISC_TF(ISC_IPADDR_ISEXPERIMENTAL(na->type.in.s_addr)));
396 default:
397 return (ISC_FALSE); /* XXXMLG ? */
398 }
399 }
400
401 isc_boolean_t
402 isc_netaddr_islinklocal(isc_netaddr_t *na) {
403 switch (na->family) {
404 case AF_INET:
405 return (ISC_FALSE);
406 case AF_INET6:
407 return (ISC_TF(IN6_IS_ADDR_LINKLOCAL(&na->type.in6)));
408 default:
409 return (ISC_FALSE);
410 }
411 }
412
413 isc_boolean_t
414 isc_netaddr_issitelocal(isc_netaddr_t *na) {
415 switch (na->family) {
416 case AF_INET:
417 return (ISC_FALSE);
418 case AF_INET6:
419 return (ISC_TF(IN6_IS_ADDR_SITELOCAL(&na->type.in6)));
420 default:
421 return (ISC_FALSE);
422 }
423 }
424
425 void
426 isc_netaddr_fromv4mapped(isc_netaddr_t *t, const isc_netaddr_t *s) {
427 isc_netaddr_t *src;
428
429 DE_CONST(s, src); /* Must come before IN6_IS_ADDR_V4MAPPED. */
430
431 REQUIRE(s->family == AF_INET6);
432 REQUIRE(IN6_IS_ADDR_V4MAPPED(&src->type.in6));
433
434 memset(t, 0, sizeof(*t));
435 t->family = AF_INET;
436 memcpy(&t->type.in, (char *)&src->type.in6 + 12, 4);
437 return;
438 }
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