contrib/bind9/lib/dns/rdata/generic/ptr_12.c

   1 /*
   2  * Copyright (C) 2004, 2007, 2009, 2015  Internet Systems Consortium, Inc. ("ISC")
   3  * Copyright (C) 1998-2001  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: ptr_12.c,v 1.45 2009/12/04 22:06:37 tbox Exp $ */
  19
  20 /* Reviewed: Thu Mar 16 14:05:12 PST 2000 by explorer */
  21
  22 #ifndef RDATA_GENERIC_PTR_12_C
  23 #define RDATA_GENERIC_PTR_12_C
  24
  25 #define RRTYPE_PTR_ATTRIBUTES (0)
  26
  27 static inline isc_result_t
  28 fromtext_ptr(ARGS_FROMTEXT) {
  29         isc_token_t token;
  30         dns_name_t name;
  31         isc_buffer_t buffer;
  32
  33         REQUIRE(type == dns_rdatatype_ptr);
  34
  35         UNUSED(type);
  36         UNUSED(rdclass);
  37         UNUSED(callbacks);
  38
  39         RETERR(isc_lex_getmastertoken(lexer, &token, isc_tokentype_string,
  40                                       ISC_FALSE));
  41
  42         dns_name_init(&name, NULL);
  43         buffer_fromregion(&buffer, &token.value.as_region);
  44         if (origin == NULL)
  45                 origin = dns_rootname;
  46         RETTOK(dns_name_fromtext(&name, &buffer, origin, options, target));
  47         if (rdclass == dns_rdataclass_in &&
  48             (options & DNS_RDATA_CHECKNAMES) != 0 &&
  49             (options & DNS_RDATA_CHECKREVERSE) != 0) {
  50                 isc_boolean_t ok;
  51                 ok = dns_name_ishostname(&name, ISC_FALSE);
  52                 if (!ok && (options & DNS_RDATA_CHECKNAMESFAIL) != 0)
  53                         RETTOK(DNS_R_BADNAME);
  54                 if (!ok && callbacks != NULL)
  55                         warn_badname(&name, lexer, callbacks);
  56         }
  57         return (ISC_R_SUCCESS);
  58 }
  59
  60 static inline isc_result_t
  61 totext_ptr(ARGS_TOTEXT) {
  62         isc_region_t region;
  63         dns_name_t name;
  64         dns_name_t prefix;
  65         isc_boolean_t sub;
  66
  67         REQUIRE(rdata->type == dns_rdatatype_ptr);
  68         REQUIRE(rdata->length != 0);
  69
  70         dns_name_init(&name, NULL);
  71         dns_name_init(&prefix, NULL);
  72
  73         dns_rdata_toregion(rdata, &region);
  74         dns_name_fromregion(&name, &region);
  75
  76         sub = name_prefix(&name, tctx->origin, &prefix);
  77
  78         return (dns_name_totext(&prefix, sub, target));
  79 }
  80
  81 static inline isc_result_t
  82 fromwire_ptr(ARGS_FROMWIRE) {
  83         dns_name_t name;
  84
  85         REQUIRE(type == dns_rdatatype_ptr);
  86
  87         UNUSED(type);
  88         UNUSED(rdclass);
  89
  90         dns_decompress_setmethods(dctx, DNS_COMPRESS_GLOBAL14);
  91
  92         dns_name_init(&name, NULL);
  93         return (dns_name_fromwire(&name, source, dctx, options, target));
  94 }
  95
  96 static inline isc_result_t
  97 towire_ptr(ARGS_TOWIRE) {
  98         dns_name_t name;
  99         dns_offsets_t offsets;
 100         isc_region_t region;
 101
 102         REQUIRE(rdata->type == dns_rdatatype_ptr);
 103         REQUIRE(rdata->length != 0);
 104
 105         dns_compress_setmethods(cctx, DNS_COMPRESS_GLOBAL14);
 106
 107         dns_name_init(&name, offsets);
 108         dns_rdata_toregion(rdata, &region);
 109         dns_name_fromregion(&name, &region);
 110
 111         return (dns_name_towire(&name, cctx, target));
 112 }
 113
 114 static inline int
 115 compare_ptr(ARGS_COMPARE) {
 116         dns_name_t name1;
 117         dns_name_t name2;
 118         isc_region_t region1;
 119         isc_region_t region2;
 120
 121         REQUIRE(rdata1->type == rdata2->type);
 122         REQUIRE(rdata1->rdclass == rdata2->rdclass);
 123         REQUIRE(rdata1->type == dns_rdatatype_ptr);
 124         REQUIRE(rdata1->length != 0);
 125         REQUIRE(rdata2->length != 0);
 126
 127         dns_name_init(&name1, NULL);
 128         dns_name_init(&name2, NULL);
 129
 130         dns_rdata_toregion(rdata1, &region1);
 131         dns_rdata_toregion(rdata2, &region2);
 132
 133         dns_name_fromregion(&name1, &region1);
 134         dns_name_fromregion(&name2, &region2);
 135
 136         return (dns_name_rdatacompare(&name1, &name2));
 137 }
 138
 139 static inline isc_result_t
 140 fromstruct_ptr(ARGS_FROMSTRUCT) {
 141         dns_rdata_ptr_t *ptr = source;
 142         isc_region_t region;
 143
 144         REQUIRE(type == dns_rdatatype_ptr);
 145         REQUIRE(source != NULL);
 146         REQUIRE(ptr->common.rdtype == type);
 147         REQUIRE(ptr->common.rdclass == rdclass);
 148
 149         UNUSED(type);
 150         UNUSED(rdclass);
 151
 152         dns_name_toregion(&ptr->ptr, &region);
 153         return (isc_buffer_copyregion(target, &region));
 154 }
 155
 156 static inline isc_result_t
 157 tostruct_ptr(ARGS_TOSTRUCT) {
 158         isc_region_t region;
 159         dns_rdata_ptr_t *ptr = target;
 160         dns_name_t name;
 161
 162         REQUIRE(rdata->type == dns_rdatatype_ptr);
 163         REQUIRE(target != NULL);
 164         REQUIRE(rdata->length != 0);
 165
 166         ptr->common.rdclass = rdata->rdclass;
 167         ptr->common.rdtype = rdata->type;
 168         ISC_LINK_INIT(&ptr->common, link);
 169
 170         dns_name_init(&name, NULL);
 171         dns_rdata_toregion(rdata, &region);
 172         dns_name_fromregion(&name, &region);
 173         dns_name_init(&ptr->ptr, NULL);
 174         RETERR(name_duporclone(&name, mctx, &ptr->ptr));
 175         ptr->mctx = mctx;
 176         return (ISC_R_SUCCESS);
 177 }
 178
 179 static inline void
 180 freestruct_ptr(ARGS_FREESTRUCT) {
 181         dns_rdata_ptr_t *ptr = source;
 182
 183         REQUIRE(source != NULL);
 184         REQUIRE(ptr->common.rdtype == dns_rdatatype_ptr);
 185
 186         if (ptr->mctx == NULL)
 187                 return;
 188
 189         dns_name_free(&ptr->ptr, ptr->mctx);
 190         ptr->mctx = NULL;
 191 }
 192
 193 static inline isc_result_t
 194 additionaldata_ptr(ARGS_ADDLDATA) {
 195         REQUIRE(rdata->type == dns_rdatatype_ptr);
 196
 197         UNUSED(rdata);
 198         UNUSED(add);
 199         UNUSED(arg);
 200
 201         return (ISC_R_SUCCESS);
 202 }
 203
 204 static inline isc_result_t
 205 digest_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
 218 static inline isc_boolean_t
 219 checkowner_ptr(ARGS_CHECKOWNER) {
 220
 221         REQUIRE(type == dns_rdatatype_ptr);
 222
 223         UNUSED(name);
 224         UNUSED(type);
 225         UNUSED(rdclass);
 226         UNUSED(wildcard);
 227
 228         return (ISC_TRUE);
 229 }
 230
 231 static unsigned char ip6_arpa_data[]  = "\003IP6\004ARPA";
 232 static unsigned char ip6_arpa_offsets[] = { 0, 4, 9 };
 233 static const dns_name_t ip6_arpa =
 234 {
 235         DNS_NAME_MAGIC,
 236         ip6_arpa_data, 10, 3,
 237         DNS_NAMEATTR_READONLY | DNS_NAMEATTR_ABSOLUTE,
 238         ip6_arpa_offsets, NULL,
 239         {(void *)-1, (void *)-1},
 240         {NULL, NULL}
 241 };
 242
 243 static unsigned char ip6_int_data[]  = "\003IP6\003INT";
 244 static unsigned char ip6_int_offsets[] = { 0, 4, 8 };
 245 static const dns_name_t ip6_int =
 246 {
 247         DNS_NAME_MAGIC,
 248         ip6_int_data, 9, 3,
 249         DNS_NAMEATTR_READONLY | DNS_NAMEATTR_ABSOLUTE,
 250         ip6_int_offsets, NULL,
 251         {(void *)-1, (void *)-1},
 252         {NULL, NULL}
 253 };
 254
 255 static unsigned char in_addr_arpa_data[]  = "\007IN-ADDR\004ARPA";
 256 static unsigned char in_addr_arpa_offsets[] = { 0, 8, 13 };
 257 static const dns_name_t in_addr_arpa =
 258 {
 259         DNS_NAME_MAGIC,
 260         in_addr_arpa_data, 14, 3,
 261         DNS_NAMEATTR_READONLY | DNS_NAMEATTR_ABSOLUTE,
 262         in_addr_arpa_offsets, NULL,
 263         {(void *)-1, (void *)-1},
 264         {NULL, NULL}
 265 };
 266
 267 static inline isc_boolean_t
 268 checknames_ptr(ARGS_CHECKNAMES) {
 269         isc_region_t region;
 270         dns_name_t name;
 271
 272         REQUIRE(rdata->type == dns_rdatatype_ptr);
 273
 274         if (rdata->rdclass != dns_rdataclass_in)
 275             return (ISC_TRUE);
 276
 277         if (dns_name_isdnssd(owner))
 278                 return (ISC_TRUE);
 279
 280         if (dns_name_issubdomain(owner, &in_addr_arpa) ||
 281             dns_name_issubdomain(owner, &ip6_arpa) ||
 282             dns_name_issubdomain(owner, &ip6_int)) {
 283                 dns_rdata_toregion(rdata, &region);
 284                 dns_name_init(&name, NULL);
 285                 dns_name_fromregion(&name, &region);
 286                 if (!dns_name_ishostname(&name, ISC_FALSE)) {
 287                         if (bad != NULL)
 288                                 dns_name_clone(&name, bad);
 289                         return (ISC_FALSE);
 290                 }
 291         }
 292         return (ISC_TRUE);
 293 }
 294
 295 static inline int
 296 casecompare_ptr(ARGS_COMPARE) {
 297         return (compare_ptr(rdata1, rdata2));
 298 }
 299 #endif  /* RDATA_GENERIC_PTR_12_C */