1 /* $NetBSD: dname_39.c,v 1.9 2025/01/26 16:25:30 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 /* RFC2672 */ 17 18 #ifndef RDATA_GENERIC_DNAME_39_C 19 #define RDATA_GENERIC_DNAME_39_C 20 21 #define RRTYPE_DNAME_ATTRIBUTES (DNS_RDATATYPEATTR_SINGLETON) 22 23 static isc_result_t 24 fromtext_dname(ARGS_FROMTEXT) { 25 isc_token_t token; 26 dns_name_t name; 27 isc_buffer_t buffer; 28 29 REQUIRE(type == dns_rdatatype_dname); 30 31 UNUSED(type); 32 UNUSED(rdclass); 33 UNUSED(callbacks); 34 35 RETERR(isc_lex_getmastertoken(lexer, &token, isc_tokentype_string, 36 false)); 37 38 dns_name_init(&name, NULL); 39 buffer_fromregion(&buffer, &token.value.as_region); 40 if (origin == NULL) { 41 origin = dns_rootname; 42 } 43 RETTOK(dns_name_fromtext(&name, &buffer, origin, options, target)); 44 return ISC_R_SUCCESS; 45 } 46 47 static isc_result_t 48 totext_dname(ARGS_TOTEXT) { 49 isc_region_t region; 50 dns_name_t name; 51 dns_name_t prefix; 52 unsigned int opts; 53 54 REQUIRE(rdata->type == dns_rdatatype_dname); 55 REQUIRE(rdata->length != 0); 56 57 dns_name_init(&name, NULL); 58 dns_name_init(&prefix, NULL); 59 60 dns_rdata_toregion(rdata, ®ion); 61 dns_name_fromregion(&name, ®ion); 62 63 opts = name_prefix(&name, tctx->origin, &prefix) ? DNS_NAME_OMITFINALDOT 64 : 0; 65 return dns_name_totext(&prefix, opts, target); 66 } 67 68 static isc_result_t 69 fromwire_dname(ARGS_FROMWIRE) { 70 dns_name_t name; 71 72 REQUIRE(type == dns_rdatatype_dname); 73 74 UNUSED(type); 75 UNUSED(rdclass); 76 77 dctx = dns_decompress_setpermitted(dctx, false); 78 79 dns_name_init(&name, NULL); 80 return dns_name_fromwire(&name, source, dctx, target); 81 } 82 83 static isc_result_t 84 towire_dname(ARGS_TOWIRE) { 85 dns_name_t name; 86 dns_offsets_t offsets; 87 isc_region_t region; 88 89 REQUIRE(rdata->type == dns_rdatatype_dname); 90 REQUIRE(rdata->length != 0); 91 92 dns_compress_setpermitted(cctx, false); 93 dns_name_init(&name, offsets); 94 dns_rdata_toregion(rdata, ®ion); 95 dns_name_fromregion(&name, ®ion); 96 97 return dns_name_towire(&name, cctx, target, NULL); 98 } 99 100 static int 101 compare_dname(ARGS_COMPARE) { 102 dns_name_t name1; 103 dns_name_t name2; 104 isc_region_t region1; 105 isc_region_t region2; 106 107 REQUIRE(rdata1->type == rdata2->type); 108 REQUIRE(rdata1->rdclass == rdata2->rdclass); 109 REQUIRE(rdata1->type == dns_rdatatype_dname); 110 REQUIRE(rdata1->length != 0); 111 REQUIRE(rdata2->length != 0); 112 113 dns_name_init(&name1, NULL); 114 dns_name_init(&name2, NULL); 115 116 dns_rdata_toregion(rdata1, ®ion1); 117 dns_rdata_toregion(rdata2, ®ion2); 118 119 dns_name_fromregion(&name1, ®ion1); 120 dns_name_fromregion(&name2, ®ion2); 121 122 return dns_name_rdatacompare(&name1, &name2); 123 } 124 125 static isc_result_t 126 fromstruct_dname(ARGS_FROMSTRUCT) { 127 dns_rdata_dname_t *dname = source; 128 isc_region_t region; 129 130 REQUIRE(type == dns_rdatatype_dname); 131 REQUIRE(dname != NULL); 132 REQUIRE(dname->common.rdtype == type); 133 REQUIRE(dname->common.rdclass == rdclass); 134 135 UNUSED(type); 136 UNUSED(rdclass); 137 138 dns_name_toregion(&dname->dname, ®ion); 139 return isc_buffer_copyregion(target, ®ion); 140 } 141 142 static isc_result_t 143 tostruct_dname(ARGS_TOSTRUCT) { 144 isc_region_t region; 145 dns_rdata_dname_t *dname = target; 146 dns_name_t name; 147 148 REQUIRE(rdata->type == dns_rdatatype_dname); 149 REQUIRE(dname != NULL); 150 REQUIRE(rdata->length != 0); 151 152 dname->common.rdclass = rdata->rdclass; 153 dname->common.rdtype = rdata->type; 154 ISC_LINK_INIT(&dname->common, link); 155 156 dns_name_init(&name, NULL); 157 dns_rdata_toregion(rdata, ®ion); 158 dns_name_fromregion(&name, ®ion); 159 dns_name_init(&dname->dname, NULL); 160 name_duporclone(&name, mctx, &dname->dname); 161 dname->mctx = mctx; 162 return ISC_R_SUCCESS; 163 } 164 165 static void 166 freestruct_dname(ARGS_FREESTRUCT) { 167 dns_rdata_dname_t *dname = source; 168 169 REQUIRE(dname != NULL); 170 REQUIRE(dname->common.rdtype == dns_rdatatype_dname); 171 172 if (dname->mctx == NULL) { 173 return; 174 } 175 176 dns_name_free(&dname->dname, dname->mctx); 177 dname->mctx = NULL; 178 } 179 180 static isc_result_t 181 additionaldata_dname(ARGS_ADDLDATA) { 182 REQUIRE(rdata->type == dns_rdatatype_dname); 183 184 UNUSED(rdata); 185 UNUSED(owner); 186 UNUSED(add); 187 UNUSED(arg); 188 189 return ISC_R_SUCCESS; 190 } 191 192 static isc_result_t 193 digest_dname(ARGS_DIGEST) { 194 isc_region_t r; 195 dns_name_t name; 196 197 REQUIRE(rdata->type == dns_rdatatype_dname); 198 199 dns_rdata_toregion(rdata, &r); 200 dns_name_init(&name, NULL); 201 dns_name_fromregion(&name, &r); 202 203 return dns_name_digest(&name, digest, arg); 204 } 205 206 static bool 207 checkowner_dname(ARGS_CHECKOWNER) { 208 REQUIRE(type == dns_rdatatype_dname); 209 210 UNUSED(name); 211 UNUSED(type); 212 UNUSED(rdclass); 213 UNUSED(wildcard); 214 215 return true; 216 } 217 218 static bool 219 checknames_dname(ARGS_CHECKNAMES) { 220 REQUIRE(rdata->type == dns_rdatatype_dname); 221 222 UNUSED(rdata); 223 UNUSED(owner); 224 UNUSED(bad); 225 226 return true; 227 } 228 229 static int 230 casecompare_dname(ARGS_COMPARE) { 231 return compare_dname(rdata1, rdata2); 232 } 233 #endif /* RDATA_GENERIC_DNAME_39_C */ 234