/contrib/bind9/lib/dns/rdata/in_1/a6_38.c

  1/*
  2 * Copyright (C) 2004, 2007, 2009  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: a6_38.c,v 1.56 2009/12/04 22:06:37 tbox Exp $ */
 19
 20/* RFC2874 */
 21
 22#ifndef RDATA_IN_1_A6_28_C
 23#define RDATA_IN_1_A6_28_C
 24
 25#include <isc/net.h>
 26
 27#define RRTYPE_A6_ATTRIBUTES (0)
 28
 29static inline isc_result_t
 30fromtext_in_a6(ARGS_FROMTEXT) {
 31	isc_token_t token;
 32	unsigned char addr[16];
 33	unsigned char prefixlen;
 34	unsigned char octets;
 35	unsigned char mask;
 36	dns_name_t name;
 37	isc_buffer_t buffer;
 38	isc_boolean_t ok;
 39
 40	REQUIRE(type == 38);
 41	REQUIRE(rdclass == 1);
 42
 43	UNUSED(type);
 44	UNUSED(rdclass);
 45	UNUSED(callbacks);
 46
 47	/*
 48	 * Prefix length.
 49	 */
 50	RETERR(isc_lex_getmastertoken(lexer, &token, isc_tokentype_number,
 51				      ISC_FALSE));
 52	if (token.value.as_ulong > 128U)
 53		RETTOK(ISC_R_RANGE);
 54
 55	prefixlen = (unsigned char)token.value.as_ulong;
 56	RETERR(mem_tobuffer(target, &prefixlen, 1));
 57
 58	/*
 59	 * Suffix.
 60	 */
 61	if (prefixlen != 128) {
 62		/*
 63		 * Prefix 0..127.
 64		 */
 65		octets = prefixlen/8;
 66		/*
 67		 * Octets 0..15.
 68		 */
 69		RETERR(isc_lex_getmastertoken(lexer, &token,
 70					      isc_tokentype_string,
 71					      ISC_FALSE));
 72		if (inet_pton(AF_INET6, DNS_AS_STR(token), addr) != 1)
 73			RETTOK(DNS_R_BADAAAA);
 74		mask = 0xff >> (prefixlen % 8);
 75		addr[octets] &= mask;
 76		RETERR(mem_tobuffer(target, &addr[octets], 16 - octets));
 77	}
 78
 79	if (prefixlen == 0)
 80		return (ISC_R_SUCCESS);
 81
 82	RETERR(isc_lex_getmastertoken(lexer, &token, isc_tokentype_string,
 83				      ISC_FALSE));
 84	dns_name_init(&name, NULL);
 85	buffer_fromregion(&buffer, &token.value.as_region);
 86	origin = (origin != NULL) ? origin : dns_rootname;
 87	RETTOK(dns_name_fromtext(&name, &buffer, origin, options, target));
 88	ok = ISC_TRUE;
 89	if ((options & DNS_RDATA_CHECKNAMES) != 0)
 90		ok = dns_name_ishostname(&name, ISC_FALSE);
 91	if (!ok && (options & DNS_RDATA_CHECKNAMESFAIL) != 0)
 92		RETTOK(DNS_R_BADNAME);
 93	if (!ok && callbacks != NULL)
 94		warn_badname(&name, lexer, callbacks);
 95	return (ISC_R_SUCCESS);
 96}
 97
 98static inline isc_result_t
 99totext_in_a6(ARGS_TOTEXT) {
100	isc_region_t sr, ar;
101	unsigned char addr[16];
102	unsigned char prefixlen;
103	unsigned char octets;
104	unsigned char mask;
105	char buf[sizeof("128")];
106	dns_name_t name;
107	dns_name_t prefix;
108	isc_boolean_t sub;
109
110	REQUIRE(rdata->type == 38);
111	REQUIRE(rdata->rdclass == 1);
112	REQUIRE(rdata->length != 0);
113
114	dns_rdata_toregion(rdata, &sr);
115	prefixlen = sr.base[0];
116	INSIST(prefixlen <= 128);
117	isc_region_consume(&sr, 1);
118	sprintf(buf, "%u", prefixlen);
119	RETERR(str_totext(buf, target));
120	RETERR(str_totext(" ", target));
121
122	if (prefixlen != 128) {
123		octets = prefixlen/8;
124		memset(addr, 0, sizeof(addr));
125		memcpy(&addr[octets], sr.base, 16 - octets);
126		mask = 0xff >> (prefixlen % 8);
127		addr[octets] &= mask;
128		ar.base = addr;
129		ar.length = sizeof(addr);
130		RETERR(inet_totext(AF_INET6, &ar, target));
131		isc_region_consume(&sr, 16 - octets);
132	}
133
134	if (prefixlen == 0)
135		return (ISC_R_SUCCESS);
136
137	RETERR(str_totext(" ", target));
138	dns_name_init(&name, NULL);
139	dns_name_init(&prefix, NULL);
140	dns_name_fromregion(&name, &sr);
141	sub = name_prefix(&name, tctx->origin, &prefix);
142	return (dns_name_totext(&prefix, sub, target));
143}
144
145static inline isc_result_t
146fromwire_in_a6(ARGS_FROMWIRE) {
147	isc_region_t sr;
148	unsigned char prefixlen;
149	unsigned char octets;
150	unsigned char mask;
151	dns_name_t name;
152
153	REQUIRE(type == 38);
154	REQUIRE(rdclass == 1);
155
156	UNUSED(type);
157	UNUSED(rdclass);
158
159	dns_decompress_setmethods(dctx, DNS_COMPRESS_NONE);
160
161	isc_buffer_activeregion(source, &sr);
162	/*
163	 * Prefix length.
164	 */
165	if (sr.length < 1)
166		return (ISC_R_UNEXPECTEDEND);
167	prefixlen = sr.base[0];
168	if (prefixlen > 128)
169		return (ISC_R_RANGE);
170	isc_region_consume(&sr, 1);
171	RETERR(mem_tobuffer(target, &prefixlen, 1));
172	isc_buffer_forward(source, 1);
173
174	/*
175	 * Suffix.
176	 */
177	if (prefixlen != 128) {
178		octets = 16 - prefixlen / 8;
179		if (sr.length < octets)
180			return (ISC_R_UNEXPECTEDEND);
181		mask = 0xff >> (prefixlen % 8);
182		sr.base[0] &= mask;	/* Ensure pad bits are zero. */
183		RETERR(mem_tobuffer(target, sr.base, octets));
184		isc_buffer_forward(source, octets);
185	}
186
187	if (prefixlen == 0)
188		return (ISC_R_SUCCESS);
189
190	dns_name_init(&name, NULL);
191	return (dns_name_fromwire(&name, source, dctx, options, target));
192}
193
194static inline isc_result_t
195towire_in_a6(ARGS_TOWIRE) {
196	isc_region_t sr;
197	dns_name_t name;
198	dns_offsets_t offsets;
199	unsigned char prefixlen;
200	unsigned char octets;
201
202	REQUIRE(rdata->type == 38);
203	REQUIRE(rdata->rdclass == 1);
204	REQUIRE(rdata->length != 0);
205
206	dns_compress_setmethods(cctx, DNS_COMPRESS_NONE);
207	dns_rdata_toregion(rdata, &sr);
208	prefixlen = sr.base[0];
209	INSIST(prefixlen <= 128);
210
211	octets = 1 + 16 - prefixlen / 8;
212	RETERR(mem_tobuffer(target, sr.base, octets));
213	isc_region_consume(&sr, octets);
214
215	if (prefixlen == 0)
216		return (ISC_R_SUCCESS);
217
218	dns_name_init(&name, offsets);
219	dns_name_fromregion(&name, &sr);
220	return (dns_name_towire(&name, cctx, target));
221}
222
223static inline int
224compare_in_a6(ARGS_COMPARE) {
225	int order;
226	unsigned char prefixlen1, prefixlen2;
227	unsigned char octets;
228	dns_name_t name1;
229	dns_name_t name2;
230	isc_region_t region1;
231	isc_region_t region2;
232
233	REQUIRE(rdata1->type == rdata2->type);
234	REQUIRE(rdata1->rdclass == rdata2->rdclass);
235	REQUIRE(rdata1->type == 38);
236	REQUIRE(rdata1->rdclass == 1);
237	REQUIRE(rdata1->length != 0);
238	REQUIRE(rdata2->length != 0);
239
240	dns_rdata_toregion(rdata1, &region1);
241	dns_rdata_toregion(rdata2, &region2);
242	prefixlen1 = region1.base[0];
243	prefixlen2 = region2.base[0];
244	isc_region_consume(&region1, 1);
245	isc_region_consume(&region2, 1);
246	if (prefixlen1 < prefixlen2)
247		return (-1);
248	else if (prefixlen1 > prefixlen2)
249		return (1);
250	/*
251	 * Prefix lengths are equal.
252	 */
253	octets = 16 - prefixlen1 / 8;
254
255	if (octets > 0) {
256		order = memcmp(region1.base, region2.base, octets);
257		if (order < 0)
258			return (-1);
259		else if (order > 0)
260			return (1);
261		/*
262		 * Address suffixes are equal.
263		 */
264		if (prefixlen1 == 0)
265			return (order);
266		isc_region_consume(&region1, octets);
267		isc_region_consume(&region2, octets);
268	}
269
270	dns_name_init(&name1, NULL);
271	dns_name_init(&name2, NULL);
272	dns_name_fromregion(&name1, &region1);
273	dns_name_fromregion(&name2, &region2);
274	return (dns_name_rdatacompare(&name1, &name2));
275}
276
277static inline isc_result_t
278fromstruct_in_a6(ARGS_FROMSTRUCT) {
279	dns_rdata_in_a6_t *a6 = source;
280	isc_region_t region;
281	int octets;
282	isc_uint8_t bits;
283	isc_uint8_t first;
284	isc_uint8_t mask;
285
286	REQUIRE(type == 38);
287	REQUIRE(rdclass == 1);
288	REQUIRE(source != NULL);
289	REQUIRE(a6->common.rdtype == type);
290	REQUIRE(a6->common.rdclass == rdclass);
291
292	UNUSED(type);
293	UNUSED(rdclass);
294
295	if (a6->prefixlen > 128)
296		return (ISC_R_RANGE);
297
298	RETERR(uint8_tobuffer(a6->prefixlen, target));
299
300	/* Suffix */
301	if (a6->prefixlen != 128) {
302		octets = 16 - a6->prefixlen / 8;
303		bits = a6->prefixlen % 8;
304		if (bits != 0) {
305			mask = 0xffU >> bits;
306			first = a6->in6_addr.s6_addr[16 - octets] & mask;
307			RETERR(uint8_tobuffer(first, target));
308			octets--;
309		}
310		if (octets > 0)
311			RETERR(mem_tobuffer(target,
312					    a6->in6_addr.s6_addr + 16 - octets,
313					    octets));
314	}
315
316	if (a6->prefixlen == 0)
317		return (ISC_R_SUCCESS);
318	dns_name_toregion(&a6->prefix, &region);
319	return (isc_buffer_copyregion(target, &region));
320}
321
322static inline isc_result_t
323tostruct_in_a6(ARGS_TOSTRUCT) {
324	dns_rdata_in_a6_t *a6 = target;
325	unsigned char octets;
326	dns_name_t name;
327	isc_region_t r;
328
329	REQUIRE(rdata->type == 38);
330	REQUIRE(rdata->rdclass == 1);
331	REQUIRE(target != NULL);
332	REQUIRE(rdata->length != 0);
333
334	a6->common.rdclass = rdata->rdclass;
335	a6->common.rdtype = rdata->type;
336	ISC_LINK_INIT(&a6->common, link);
337
338	dns_rdata_toregion(rdata, &r);
339
340	a6->prefixlen = uint8_fromregion(&r);
341	isc_region_consume(&r, 1);
342	memset(a6->in6_addr.s6_addr, 0, sizeof(a6->in6_addr.s6_addr));
343
344	/*
345	 * Suffix.
346	 */
347	if (a6->prefixlen != 128) {
348		octets = 16 - a6->prefixlen / 8;
349		INSIST(r.length >= octets);
350		memcpy(a6->in6_addr.s6_addr + 16 - octets, r.base, octets);
351		isc_region_consume(&r, octets);
352	}
353
354	/*
355	 * Prefix.
356	 */
357	dns_name_init(&a6->prefix, NULL);
358	if (a6->prefixlen != 0) {
359		dns_name_init(&name, NULL);
360		dns_name_fromregion(&name, &r);
361		RETERR(name_duporclone(&name, mctx, &a6->prefix));
362	}
363	a6->mctx = mctx;
364	return (ISC_R_SUCCESS);
365}
366
367static inline void
368freestruct_in_a6(ARGS_FREESTRUCT) {
369	dns_rdata_in_a6_t *a6 = source;
370
371	REQUIRE(source != NULL);
372	REQUIRE(a6->common.rdclass == 1);
373	REQUIRE(a6->common.rdtype == 38);
374
375	if (a6->mctx == NULL)
376		return;
377
378	if (dns_name_dynamic(&a6->prefix))
379		dns_name_free(&a6->prefix, a6->mctx);
380	a6->mctx = NULL;
381}
382
383static inline isc_result_t
384additionaldata_in_a6(ARGS_ADDLDATA) {
385	REQUIRE(rdata->type == 38);
386	REQUIRE(rdata->rdclass == 1);
387
388	UNUSED(rdata);
389	UNUSED(add);
390	UNUSED(arg);
391
392	return (ISC_R_SUCCESS);
393}
394
395static inline isc_result_t
396digest_in_a6(ARGS_DIGEST) {
397	isc_region_t r1, r2;
398	unsigned char prefixlen, octets;
399	isc_result_t result;
400	dns_name_t name;
401
402	REQUIRE(rdata->type == 38);
403	REQUIRE(rdata->rdclass == 1);
404
405	dns_rdata_toregion(rdata, &r1);
406	r2 = r1;
407	prefixlen = r1.base[0];
408	octets = 1 + 16 - prefixlen / 8;
409
410	r1.length = octets;
411	result = (digest)(arg, &r1);
412	if (result != ISC_R_SUCCESS)
413		return (result);
414	if (prefixlen == 0)
415		return (ISC_R_SUCCESS);
416
417	isc_region_consume(&r2, octets);
418	dns_name_init(&name, NULL);
419	dns_name_fromregion(&name, &r2);
420	return (dns_name_digest(&name, digest, arg));
421}
422
423static inline isc_boolean_t
424checkowner_in_a6(ARGS_CHECKOWNER) {
425
426	REQUIRE(type == 38);
427	REQUIRE(rdclass == 1);
428
429	UNUSED(type);
430	UNUSED(rdclass);
431
432	return (dns_name_ishostname(name, wildcard));
433}
434
435static inline isc_boolean_t
436checknames_in_a6(ARGS_CHECKNAMES) {
437	isc_region_t region;
438	dns_name_t name;
439	unsigned int prefixlen;
440
441	REQUIRE(rdata->type == 38);
442	REQUIRE(rdata->rdclass == 1);
443
444	UNUSED(owner);
445
446	dns_rdata_toregion(rdata, &region);
447	prefixlen = uint8_fromregion(&region);
448	if (prefixlen == 0)
449		return (ISC_TRUE);
450	isc_region_consume(&region, 1 + 16 - prefixlen / 8);
451	dns_name_init(&name, NULL);
452	dns_name_fromregion(&name, &region);
453	if (!dns_name_ishostname(&name, ISC_FALSE)) {
454		if (bad != NULL)
455			dns_name_clone(&name, bad);
456		return (ISC_FALSE);
457	}
458	return (ISC_TRUE);
459}
460
461static inline int
462casecompare_in_a6(ARGS_COMPARE) {
463	return (compare_in_a6(rdata1, rdata2));
464}
465
466#endif	/* RDATA_IN_1_A6_38_C */