1/*	$NetBSD: ptr_12.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#ifndef RDATA_GENERIC_PTR_12_C
17#define RDATA_GENERIC_PTR_12_C
18
19#define RRTYPE_PTR_ATTRIBUTES (0)
20
21static isc_result_t
22fromtext_ptr(ARGS_FROMTEXT) {
23	isc_token_t token;
24	dns_name_t name;
25	isc_buffer_t buffer;
26
27	REQUIRE(type == dns_rdatatype_ptr);
28
29	UNUSED(type);
30	UNUSED(rdclass);
31	UNUSED(callbacks);
32
33	RETERR(isc_lex_getmastertoken(lexer, &token, isc_tokentype_string,
34				      false));
35
36	dns_name_init(&name, NULL);
37	buffer_fromregion(&buffer, &token.value.as_region);
38	if (origin == NULL) {
39		origin = dns_rootname;
40	}
41	RETTOK(dns_name_fromtext(&name, &buffer, origin, options, target));
42	if (rdclass == dns_rdataclass_in &&
43	    (options & DNS_RDATA_CHECKNAMES) != 0 &&
44	    (options & DNS_RDATA_CHECKREVERSE) != 0)
45	{
46		bool ok;
47		ok = dns_name_ishostname(&name, false);
48		if (!ok && (options & DNS_RDATA_CHECKNAMESFAIL) != 0) {
49			RETTOK(DNS_R_BADNAME);
50		}
51		if (!ok && callbacks != NULL) {
52			warn_badname(&name, lexer, callbacks);
53		}
54	}
55	return (ISC_R_SUCCESS);
56}
57
58static isc_result_t
59totext_ptr(ARGS_TOTEXT) {
60	isc_region_t region;
61	dns_name_t name;
62	dns_name_t prefix;
63	bool sub;
64
65	REQUIRE(rdata->type == dns_rdatatype_ptr);
66	REQUIRE(rdata->length != 0);
67
68	dns_name_init(&name, NULL);
69	dns_name_init(&prefix, NULL);
70
71	dns_rdata_toregion(rdata, &region);
72	dns_name_fromregion(&name, &region);
73
74	sub = name_prefix(&name, tctx->origin, &prefix);
75
76	return (dns_name_totext(&prefix, sub, target));
77}
78
79static isc_result_t
80fromwire_ptr(ARGS_FROMWIRE) {
81	dns_name_t name;
82
83	REQUIRE(type == dns_rdatatype_ptr);
84
85	UNUSED(type);
86	UNUSED(rdclass);
87
88	dns_decompress_setmethods(dctx, DNS_COMPRESS_GLOBAL14);
89
90	dns_name_init(&name, NULL);
91	return (dns_name_fromwire(&name, source, dctx, options, target));
92}
93
94static isc_result_t
95towire_ptr(ARGS_TOWIRE) {
96	dns_name_t name;
97	dns_offsets_t offsets;
98	isc_region_t region;
99
100	REQUIRE(rdata->type == dns_rdatatype_ptr);
101	REQUIRE(rdata->length != 0);
102
103	dns_compress_setmethods(cctx, DNS_COMPRESS_GLOBAL14);
104
105	dns_name_init(&name, offsets);
106	dns_rdata_toregion(rdata, &region);
107	dns_name_fromregion(&name, &region);
108
109	return (dns_name_towire(&name, cctx, target));
110}
111
112static int
113compare_ptr(ARGS_COMPARE) {
114	dns_name_t name1;
115	dns_name_t name2;
116	isc_region_t region1;
117	isc_region_t region2;
118
119	REQUIRE(rdata1->type == rdata2->type);
120	REQUIRE(rdata1->rdclass == rdata2->rdclass);
121	REQUIRE(rdata1->type == dns_rdatatype_ptr);
122	REQUIRE(rdata1->length != 0);
123	REQUIRE(rdata2->length != 0);
124
125	dns_name_init(&name1, NULL);
126	dns_name_init(&name2, NULL);
127
128	dns_rdata_toregion(rdata1, &region1);
129	dns_rdata_toregion(rdata2, &region2);
130
131	dns_name_fromregion(&name1, &region1);
132	dns_name_fromregion(&name2, &region2);
133
134	return (dns_name_rdatacompare(&name1, &name2));
135}
136
137static isc_result_t
138fromstruct_ptr(ARGS_FROMSTRUCT) {
139	dns_rdata_ptr_t *ptr = source;
140	isc_region_t region;
141
142	REQUIRE(type == dns_rdatatype_ptr);
143	REQUIRE(ptr != NULL);
144	REQUIRE(ptr->common.rdtype == type);
145	REQUIRE(ptr->common.rdclass == rdclass);
146
147	UNUSED(type);
148	UNUSED(rdclass);
149
150	dns_name_toregion(&ptr->ptr, &region);
151	return (isc_buffer_copyregion(target, &region));
152}
153
154static isc_result_t
155tostruct_ptr(ARGS_TOSTRUCT) {
156	isc_region_t region;
157	dns_rdata_ptr_t *ptr = target;
158	dns_name_t name;
159
160	REQUIRE(rdata->type == dns_rdatatype_ptr);
161	REQUIRE(ptr != NULL);
162	REQUIRE(rdata->length != 0);
163
164	ptr->common.rdclass = rdata->rdclass;
165	ptr->common.rdtype = rdata->type;
166	ISC_LINK_INIT(&ptr->common, link);
167
168	dns_name_init(&name, NULL);
169	dns_rdata_toregion(rdata, &region);
170	dns_name_fromregion(&name, &region);
171	dns_name_init(&ptr->ptr, NULL);
172	name_duporclone(&name, mctx, &ptr->ptr);
173	ptr->mctx = mctx;
174	return (ISC_R_SUCCESS);
175}
176
177static void
178freestruct_ptr(ARGS_FREESTRUCT) {
179	dns_rdata_ptr_t *ptr = source;
180
181	REQUIRE(ptr != NULL);
182	REQUIRE(ptr->common.rdtype == dns_rdatatype_ptr);
183
184	if (ptr->mctx == NULL) {
185		return;
186	}
187
188	dns_name_free(&ptr->ptr, ptr->mctx);
189	ptr->mctx = NULL;
190}
191
192static isc_result_t
193additionaldata_ptr(ARGS_ADDLDATA) {
194	REQUIRE(rdata->type == dns_rdatatype_ptr);
195
196	UNUSED(rdata);
197	UNUSED(owner);
198	UNUSED(add);
199	UNUSED(arg);
200
201	return (ISC_R_SUCCESS);
202}
203
204static isc_result_t
205digest_ptr(ARGS_DIGEST) {
206	isc_region_t r;
207	dns_name_t name;
208
209	REQUIRE(rdata->type == dns_rdatatype_ptr);
210
211	dns_rdata_toregion(rdata, &r);
212	dns_name_init(&name, NULL);
213	dns_name_fromregion(&name, &r);
214
215	return (dns_name_digest(&name, digest, arg));
216}
217
218static bool
219checkowner_ptr(ARGS_CHECKOWNER) {
220	REQUIRE(type == dns_rdatatype_ptr);
221
222	UNUSED(name);
223	UNUSED(type);
224	UNUSED(rdclass);
225	UNUSED(wildcard);
226
227	return (true);
228}
229
230static unsigned char ip6_arpa_data[] = "\003IP6\004ARPA";
231static unsigned char ip6_arpa_offsets[] = { 0, 4, 9 };
232static const dns_name_t ip6_arpa = DNS_NAME_INITABSOLUTE(ip6_arpa_data,
233							 ip6_arpa_offsets);
234
235static unsigned char ip6_int_data[] = "\003IP6\003INT";
236static unsigned char ip6_int_offsets[] = { 0, 4, 8 };
237static const dns_name_t ip6_int = DNS_NAME_INITABSOLUTE(ip6_int_data,
238							ip6_int_offsets);
239
240static unsigned char in_addr_arpa_data[] = "\007IN-ADDR\004ARPA";
241static unsigned char in_addr_arpa_offsets[] = { 0, 8, 13 };
242static const dns_name_t in_addr_arpa =
243	DNS_NAME_INITABSOLUTE(in_addr_arpa_data, in_addr_arpa_offsets);
244
245static bool
246checknames_ptr(ARGS_CHECKNAMES) {
247	isc_region_t region;
248	dns_name_t name;
249
250	REQUIRE(rdata->type == dns_rdatatype_ptr);
251
252	if (rdata->rdclass != dns_rdataclass_in) {
253		return (true);
254	}
255
256	if (dns_name_isdnssd(owner)) {
257		return (true);
258	}
259
260	if (dns_name_issubdomain(owner, &in_addr_arpa) ||
261	    dns_name_issubdomain(owner, &ip6_arpa) ||
262	    dns_name_issubdomain(owner, &ip6_int))
263	{
264		dns_rdata_toregion(rdata, &region);
265		dns_name_init(&name, NULL);
266		dns_name_fromregion(&name, &region);
267		if (!dns_name_ishostname(&name, false)) {
268			if (bad != NULL) {
269				dns_name_clone(&name, bad);
270			}
271			return (false);
272		}
273	}
274	return (true);
275}
276
277static int
278casecompare_ptr(ARGS_COMPARE) {
279	return (compare_ptr(rdata1, rdata2));
280}
281#endif /* RDATA_GENERIC_PTR_12_C */
282