nxt_30.c revision 1.8 
1/*	$NetBSD: nxt_30.c,v 1.8 2024/02/21 22:52:13 christos Exp $	*/
2
3/*
4 * Copyright (C) Internet Systems Consortium, Inc. ("ISC")
5 *
6 * SPDX-License-Identifier: MPL-2.0
7 *
8 * This Source Code Form is subject to the terms of the Mozilla Public
9 * License, v. 2.0. If a copy of the MPL was not distributed with this
10 * file, you can obtain one at https://mozilla.org/MPL/2.0/.
11 *
12 * See the COPYRIGHT file distributed with this work for additional
13 * information regarding copyright ownership.
14 */
15
16/* RFC2535 */
17
18#ifndef RDATA_GENERIC_NXT_30_C
19#define RDATA_GENERIC_NXT_30_C
20
21/*
22 * The attributes do not include DNS_RDATATYPEATTR_SINGLETON
23 * because we must be able to handle a parent/child NXT pair.
24 */
25#define RRTYPE_NXT_ATTRIBUTES (0)
26
27static isc_result_t
28fromtext_nxt(ARGS_FROMTEXT) {
29	isc_token_t token;
30	dns_name_t name;
31	isc_buffer_t buffer;
32	char *e;
33	unsigned char bm[8 * 1024]; /* 64k bits */
34	dns_rdatatype_t covered;
35	dns_rdatatype_t maxcovered = 0;
36	bool first = true;
37	long n;
38
39	REQUIRE(type == dns_rdatatype_nxt);
40
41	UNUSED(type);
42	UNUSED(rdclass);
43	UNUSED(callbacks);
44
45	/*
46	 * Next domain.
47	 */
48	RETERR(isc_lex_getmastertoken(lexer, &token, isc_tokentype_string,
49				      false));
50	dns_name_init(&name, NULL);
51	buffer_fromregion(&buffer, &token.value.as_region);
52	if (origin == NULL) {
53		origin = dns_rootname;
54	}
55	RETTOK(dns_name_fromtext(&name, &buffer, origin, options, target));
56
57	memset(bm, 0, sizeof(bm));
58	do {
59		RETERR(isc_lex_getmastertoken(lexer, &token,
60					      isc_tokentype_string, true));
61		if (token.type != isc_tokentype_string) {
62			break;
63		}
64		n = strtol(DNS_AS_STR(token), &e, 10);
65		if (e != DNS_AS_STR(token) && *e == '\0') {
66			covered = (dns_rdatatype_t)n;
67		} else if (dns_rdatatype_fromtext(&covered,
68						  &token.value.as_textregion) ==
69			   DNS_R_UNKNOWN)
70		{
71			RETTOK(DNS_R_UNKNOWN);
72		}
73		/*
74		 * NXT is only specified for types 1..127.
75		 */
76		if (covered < 1 || covered > 127) {
77			return (ISC_R_RANGE);
78		}
79		if (first || covered > maxcovered) {
80			maxcovered = covered;
81		}
82		first = false;
83		bm[covered / 8] |= (0x80 >> (covered % 8));
84	} while (1);
85	isc_lex_ungettoken(lexer, &token);
86	if (first) {
87		return (ISC_R_SUCCESS);
88	}
89	n = (maxcovered + 8) / 8;
90	return (mem_tobuffer(target, bm, n));
91}
92
93static isc_result_t
94totext_nxt(ARGS_TOTEXT) {
95	isc_region_t sr;
96	unsigned int i, j;
97	dns_name_t name;
98	dns_name_t prefix;
99	bool sub;
100
101	REQUIRE(rdata->type == dns_rdatatype_nxt);
102	REQUIRE(rdata->length != 0);
103
104	dns_name_init(&name, NULL);
105	dns_name_init(&prefix, NULL);
106	dns_rdata_toregion(rdata, &sr);
107	dns_name_fromregion(&name, &sr);
108	isc_region_consume(&sr, name_length(&name));
109	sub = name_prefix(&name, tctx->origin, &prefix);
110	RETERR(dns_name_totext(&prefix, sub, target));
111
112	for (i = 0; i < sr.length; i++) {
113		if (sr.base[i] != 0) {
114			for (j = 0; j < 8; j++) {
115				if ((sr.base[i] & (0x80 >> j)) != 0) {
116					{
117						dns_rdatatype_t t = i * 8 + j;
118						RETERR(str_totext(" ", target));
119						if (dns_rdatatype_isknown(t)) {
120							RETERR(dns_rdatatype_totext(
121								t, target));
122						} else {
123							char buf[sizeof("6553"
124									"5")];
125							snprintf(buf,
126								 sizeof(buf),
127								 "%u", t);
128							RETERR(str_totext(
129								buf, target));
130						}
131					}
132				}
133			}
134		}
135	}
136	return (ISC_R_SUCCESS);
137}
138
139static isc_result_t
140fromwire_nxt(ARGS_FROMWIRE) {
141	isc_region_t sr;
142	dns_name_t name;
143
144	REQUIRE(type == dns_rdatatype_nxt);
145
146	UNUSED(type);
147	UNUSED(rdclass);
148
149	dns_decompress_setmethods(dctx, DNS_COMPRESS_NONE);
150
151	dns_name_init(&name, NULL);
152	RETERR(dns_name_fromwire(&name, source, dctx, options, target));
153
154	isc_buffer_activeregion(source, &sr);
155	if (sr.length > 0 && ((sr.base[0] & 0x80) != 0 || sr.length > 16 ||
156			      sr.base[sr.length - 1] == 0))
157	{
158		return (DNS_R_BADBITMAP);
159	}
160	RETERR(mem_tobuffer(target, sr.base, sr.length));
161	isc_buffer_forward(source, sr.length);
162	return (ISC_R_SUCCESS);
163}
164
165static isc_result_t
166towire_nxt(ARGS_TOWIRE) {
167	isc_region_t sr;
168	dns_name_t name;
169	dns_offsets_t offsets;
170
171	REQUIRE(rdata->type == dns_rdatatype_nxt);
172	REQUIRE(rdata->length != 0);
173
174	dns_compress_setmethods(cctx, DNS_COMPRESS_NONE);
175	dns_name_init(&name, offsets);
176	dns_rdata_toregion(rdata, &sr);
177	dns_name_fromregion(&name, &sr);
178	isc_region_consume(&sr, name_length(&name));
179	RETERR(dns_name_towire(&name, cctx, target));
180
181	return (mem_tobuffer(target, sr.base, sr.length));
182}
183
184static int
185compare_nxt(ARGS_COMPARE) {
186	isc_region_t r1;
187	isc_region_t r2;
188	dns_name_t name1;
189	dns_name_t name2;
190	int order;
191
192	REQUIRE(rdata1->type == rdata2->type);
193	REQUIRE(rdata1->rdclass == rdata2->rdclass);
194	REQUIRE(rdata1->type == dns_rdatatype_nxt);
195	REQUIRE(rdata1->length != 0);
196	REQUIRE(rdata2->length != 0);
197
198	dns_name_init(&name1, NULL);
199	dns_name_init(&name2, NULL);
200	dns_rdata_toregion(rdata1, &r1);
201	dns_rdata_toregion(rdata2, &r2);
202	dns_name_fromregion(&name1, &r1);
203	dns_name_fromregion(&name2, &r2);
204	order = dns_name_rdatacompare(&name1, &name2);
205	if (order != 0) {
206		return (order);
207	}
208
209	isc_region_consume(&r1, name_length(&name1));
210	isc_region_consume(&r2, name_length(&name2));
211
212	return (isc_region_compare(&r1, &r2));
213}
214
215static isc_result_t
216fromstruct_nxt(ARGS_FROMSTRUCT) {
217	dns_rdata_nxt_t *nxt = source;
218	isc_region_t region;
219
220	REQUIRE(type == dns_rdatatype_nxt);
221	REQUIRE(nxt != NULL);
222	REQUIRE(nxt->common.rdtype == type);
223	REQUIRE(nxt->common.rdclass == rdclass);
224	REQUIRE(nxt->typebits != NULL || nxt->len == 0);
225	if (nxt->typebits != NULL && (nxt->typebits[0] & 0x80) == 0) {
226		REQUIRE(nxt->len <= 16);
227		REQUIRE(nxt->typebits[nxt->len - 1] != 0);
228	}
229
230	UNUSED(type);
231	UNUSED(rdclass);
232
233	dns_name_toregion(&nxt->next, &region);
234	RETERR(isc_buffer_copyregion(target, &region));
235
236	return (mem_tobuffer(target, nxt->typebits, nxt->len));
237}
238
239static isc_result_t
240tostruct_nxt(ARGS_TOSTRUCT) {
241	isc_region_t region;
242	dns_rdata_nxt_t *nxt = target;
243	dns_name_t name;
244
245	REQUIRE(rdata->type == dns_rdatatype_nxt);
246	REQUIRE(nxt != NULL);
247	REQUIRE(rdata->length != 0);
248
249	nxt->common.rdclass = rdata->rdclass;
250	nxt->common.rdtype = rdata->type;
251	ISC_LINK_INIT(&nxt->common, link);
252
253	dns_name_init(&name, NULL);
254	dns_rdata_toregion(rdata, &region);
255	dns_name_fromregion(&name, &region);
256	isc_region_consume(&region, name_length(&name));
257	dns_name_init(&nxt->next, NULL);
258	name_duporclone(&name, mctx, &nxt->next);
259
260	nxt->len = region.length;
261	nxt->typebits = mem_maybedup(mctx, region.base, region.length);
262	if (nxt->typebits == NULL) {
263		goto cleanup;
264	}
265
266	nxt->mctx = mctx;
267	return (ISC_R_SUCCESS);
268
269cleanup:
270	if (mctx != NULL) {
271		dns_name_free(&nxt->next, mctx);
272	}
273	return (ISC_R_NOMEMORY);
274}
275
276static void
277freestruct_nxt(ARGS_FREESTRUCT) {
278	dns_rdata_nxt_t *nxt = source;
279
280	REQUIRE(nxt != NULL);
281	REQUIRE(nxt->common.rdtype == dns_rdatatype_nxt);
282
283	if (nxt->mctx == NULL) {
284		return;
285	}
286
287	dns_name_free(&nxt->next, nxt->mctx);
288	if (nxt->typebits != NULL) {
289		isc_mem_free(nxt->mctx, nxt->typebits);
290	}
291	nxt->mctx = NULL;
292}
293
294static isc_result_t
295additionaldata_nxt(ARGS_ADDLDATA) {
296	REQUIRE(rdata->type == dns_rdatatype_nxt);
297
298	UNUSED(rdata);
299	UNUSED(owner);
300	UNUSED(add);
301	UNUSED(arg);
302
303	return (ISC_R_SUCCESS);
304}
305
306static isc_result_t
307digest_nxt(ARGS_DIGEST) {
308	isc_region_t r;
309	dns_name_t name;
310	isc_result_t result;
311
312	REQUIRE(rdata->type == dns_rdatatype_nxt);
313
314	dns_rdata_toregion(rdata, &r);
315	dns_name_init(&name, NULL);
316	dns_name_fromregion(&name, &r);
317	result = dns_name_digest(&name, digest, arg);
318	if (result != ISC_R_SUCCESS) {
319		return (result);
320	}
321	isc_region_consume(&r, name_length(&name));
322
323	return ((digest)(arg, &r));
324}
325
326static bool
327checkowner_nxt(ARGS_CHECKOWNER) {
328	REQUIRE(type == dns_rdatatype_nxt);
329
330	UNUSED(name);
331	UNUSED(type);
332	UNUSED(rdclass);
333	UNUSED(wildcard);
334
335	return (true);
336}
337
338static bool
339checknames_nxt(ARGS_CHECKNAMES) {
340	REQUIRE(rdata->type == dns_rdatatype_nxt);
341
342	UNUSED(rdata);
343	UNUSED(owner);
344	UNUSED(bad);
345
346	return (true);
347}
348
349static int
350casecompare_nxt(ARGS_COMPARE) {
351	return (compare_nxt(rdata1, rdata2));
352}
353#endif /* RDATA_GENERIC_NXT_30_C */
354