external/bsd/bind/dist/lib/dns/rdata/generic/opt_41.c

   1 /*      $NetBSD: opt_41.c,v 1.8 2015/07/08 17:28:59 christos Exp $      */
   2
   3 /*
   4  * Copyright (C) 2004, 2005, 2007, 2009, 2011-2014  Internet Systems Consortium, Inc. ("ISC")
   5  * Copyright (C) 1998-2002  Internet Software Consortium.
   6  *
   7  * Permission to use, copy, modify, and/or distribute this software for any
   8  * purpose with or without fee is hereby granted, provided that the above
   9  * copyright notice and this permission notice appear in all copies.
  10  *
  11  * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
  12  * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
  13  * AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
  14  * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
  15  * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
  16  * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
  17  * PERFORMANCE OF THIS SOFTWARE.
  18  */
  19
  20 /* Id */
  21
  22 /* Reviewed: Thu Mar 16 14:06:44 PST 2000 by gson */
  23
  24 /* RFC2671 */
  25
  26 #ifndef RDATA_GENERIC_OPT_41_C
  27 #define RDATA_GENERIC_OPT_41_C
  28
  29 #define RRTYPE_OPT_ATTRIBUTES (DNS_RDATATYPEATTR_SINGLETON | \
  30                                DNS_RDATATYPEATTR_META | \
  31                                DNS_RDATATYPEATTR_NOTQUESTION)
  32
  33 static inline isc_result_t
  34 fromtext_opt(ARGS_FROMTEXT) {
  35         /*
  36          * OPT records do not have a text format.
  37          */
  38
  39         REQUIRE(type == 41);
  40
  41         UNUSED(type);
  42         UNUSED(rdclass);
  43         UNUSED(lexer);
  44         UNUSED(origin);
  45         UNUSED(options);
  46         UNUSED(target);
  47         UNUSED(callbacks);
  48
  49         return (ISC_R_NOTIMPLEMENTED);
  50 }
  51
  52 static inline isc_result_t
  53 totext_opt(ARGS_TOTEXT) {
  54         isc_region_t r;
  55         isc_region_t or;
  56         isc_uint16_t option;
  57         isc_uint16_t length;
  58         char buf[sizeof("64000 64000")];
  59
  60         /*
  61          * OPT records do not have a text format.
  62          */
  63
  64         REQUIRE(rdata->type == 41);
  65
  66         dns_rdata_toregion(rdata, &r);
  67         while (r.length > 0) {
  68                 option = uint16_fromregion(&r);
  69                 isc_region_consume(&r, 2);
  70                 length = uint16_fromregion(&r);
  71                 isc_region_consume(&r, 2);
  72                 sprintf(buf, "%u %u", option, length);
  73                 RETERR(str_totext(buf, target));
  74                 INSIST(r.length >= length);
  75                 if (length > 0) {
  76                         if ((tctx->flags & DNS_STYLEFLAG_MULTILINE) != 0)
  77                                 RETERR(str_totext(" (", target));
  78                         RETERR(str_totext(tctx->linebreak, target));
  79                         or = r;
  80                         or.length = length;
  81                         if (tctx->width == 0)   /* No splitting */
  82                                 RETERR(isc_base64_totext(&or, 60, "", target));
  83                         else
  84                                 RETERR(isc_base64_totext(&or, tctx->width - 2,
  85                                                          tctx->linebreak,
  86                                                          target));
  87                         isc_region_consume(&r, length);
  88                         if ((tctx->flags & DNS_STYLEFLAG_MULTILINE) != 0)
  89                                 RETERR(str_totext(" )", target));
  90                 }
  91                 if (r.length > 0)
  92                         RETERR(str_totext(" ", target));
  93         }
  94
  95         return (ISC_R_SUCCESS);
  96 }
  97
  98 static inline isc_result_t
  99 fromwire_opt(ARGS_FROMWIRE) {
 100         isc_region_t sregion;
 101         isc_region_t tregion;
 102         isc_uint16_t opt;
 103         isc_uint16_t length;
 104         unsigned int total;
 105
 106         REQUIRE(type == 41);
 107
 108         UNUSED(type);
 109         UNUSED(rdclass);
 110         UNUSED(dctx);
 111         UNUSED(options);
 112
 113         isc_buffer_activeregion(source, &sregion);
 114         total = 0;
 115         while (sregion.length != 0) {
 116                 if (sregion.length < 4)
 117                         return (ISC_R_UNEXPECTEDEND);
 118                 opt = uint16_fromregion(&sregion);
 119                 isc_region_consume(&sregion, 2);
 120                 length = uint16_fromregion(&sregion);
 121                 isc_region_consume(&sregion, 2);
 122                 total += 4;
 123                 if (sregion.length < length)
 124                         return (ISC_R_UNEXPECTEDEND);
 125                 switch (opt) {
 126                 case DNS_OPT_CLIENT_SUBNET: {
 127                         isc_uint16_t family;
 128                         isc_uint8_t addrlen;
 129                         isc_uint8_t scope;
 130                         isc_uint8_t addrbytes;
 131
 132                         if (length < 4)
 133                                 return (DNS_R_FORMERR);
 134                         family = uint16_fromregion(&sregion);
 135                         isc_region_consume(&sregion, 2);
 136                         addrlen = uint8_fromregion(&sregion);
 137                         isc_region_consume(&sregion, 1);
 138                         scope = uint8_fromregion(&sregion);
 139                         isc_region_consume(&sregion, 1);
 140                         switch (family) {
 141                         case 1:
 142                                 if (addrlen > 32U || scope > 32U)
 143                                         return (DNS_R_FORMERR);
 144                                 break;
 145                         case 2:
 146                                 if (addrlen > 128U || scope > 128U)
 147                                         return (DNS_R_FORMERR);
 148                                 break;
 149                         }
 150                         addrbytes = (addrlen + 7) / 8;
 151                         if (addrbytes + 4 != length)
 152                                 return (DNS_R_FORMERR);
 153                         isc_region_consume(&sregion, addrbytes);
 154                         break;
 155                 }
 156                 case DNS_OPT_EXPIRE:
 157                         /*
 158                          * Request has zero length.  Response is 32 bits.
 159                          */
 160                         if (length != 0 && length != 4)
 161                                 return (DNS_R_FORMERR);
 162                         isc_region_consume(&sregion, length);
 163                         break;
 164                 default:
 165                         isc_region_consume(&sregion, length);
 166                         break;
 167                 }
 168                 total += length;
 169         }
 170
 171         isc_buffer_activeregion(source, &sregion);
 172         isc_buffer_availableregion(target, &tregion);
 173         if (tregion.length < total)
 174                 return (ISC_R_NOSPACE);
 175         memmove(tregion.base, sregion.base, total);
 176         isc_buffer_forward(source, total);
 177         isc_buffer_add(target, total);
 178
 179         return (ISC_R_SUCCESS);
 180 }
 181
 182 static inline isc_result_t
 183 towire_opt(ARGS_TOWIRE) {
 184
 185         REQUIRE(rdata->type == 41);
 186
 187         UNUSED(cctx);
 188
 189         return (mem_tobuffer(target, rdata->data, rdata->length));
 190 }
 191
 192 static inline int
 193 compare_opt(ARGS_COMPARE) {
 194         isc_region_t r1;
 195         isc_region_t r2;
 196
 197         REQUIRE(rdata1->type == rdata2->type);
 198         REQUIRE(rdata1->rdclass == rdata2->rdclass);
 199         REQUIRE(rdata1->type == 41);
 200
 201         dns_rdata_toregion(rdata1, &r1);
 202         dns_rdata_toregion(rdata2, &r2);
 203         return (isc_region_compare(&r1, &r2));
 204 }
 205
 206 static inline isc_result_t
 207 fromstruct_opt(ARGS_FROMSTRUCT) {
 208         dns_rdata_opt_t *opt = source;
 209         isc_region_t region;
 210         isc_uint16_t length;
 211
 212         REQUIRE(type == 41);
 213         REQUIRE(source != NULL);
 214         REQUIRE(opt->common.rdtype == type);
 215         REQUIRE(opt->common.rdclass == rdclass);
 216         REQUIRE(opt->options != NULL || opt->length == 0);
 217
 218         UNUSED(type);
 219         UNUSED(rdclass);
 220
 221         region.base = opt->options;
 222         region.length = opt->length;
 223         while (region.length >= 4) {
 224                 isc_region_consume(&region, 2); /* opt */
 225                 length = uint16_fromregion(&region);
 226                 isc_region_consume(&region, 2);
 227                 if (region.length < length)
 228                         return (ISC_R_UNEXPECTEDEND);
 229                 isc_region_consume(&region, length);
 230         }
 231         if (region.length != 0)
 232                 return (ISC_R_UNEXPECTEDEND);
 233
 234         return (mem_tobuffer(target, opt->options, opt->length));
 235 }
 236
 237 static inline isc_result_t
 238 tostruct_opt(ARGS_TOSTRUCT) {
 239         dns_rdata_opt_t *opt = target;
 240         isc_region_t r;
 241
 242         REQUIRE(rdata->type == 41);
 243         REQUIRE(target != NULL);
 244
 245         opt->common.rdclass = rdata->rdclass;
 246         opt->common.rdtype = rdata->type;
 247         ISC_LINK_INIT(&opt->common, link);
 248
 249         dns_rdata_toregion(rdata, &r);
 250         opt->length = r.length;
 251         opt->options = mem_maybedup(mctx, r.base, r.length);
 252         if (opt->options == NULL)
 253                 return (ISC_R_NOMEMORY);
 254
 255         opt->offset = 0;
 256         opt->mctx = mctx;
 257         return (ISC_R_SUCCESS);
 258 }
 259
 260 static inline void
 261 freestruct_opt(ARGS_FREESTRUCT) {
 262         dns_rdata_opt_t *opt = source;
 263
 264         REQUIRE(source != NULL);
 265         REQUIRE(opt->common.rdtype == 41);
 266
 267         if (opt->mctx == NULL)
 268                 return;
 269
 270         if (opt->options != NULL)
 271                 isc_mem_free(opt->mctx, opt->options);
 272         opt->mctx = NULL;
 273 }
 274
 275 static inline isc_result_t
 276 additionaldata_opt(ARGS_ADDLDATA) {
 277         REQUIRE(rdata->type == 41);
 278
 279         UNUSED(rdata);
 280         UNUSED(add);
 281         UNUSED(arg);
 282
 283         return (ISC_R_SUCCESS);
 284 }
 285
 286 static inline isc_result_t
 287 digest_opt(ARGS_DIGEST) {
 288
 289         /*
 290          * OPT records are not digested.
 291          */
 292
 293         REQUIRE(rdata->type == 41);
 294
 295         UNUSED(rdata);
 296         UNUSED(digest);
 297         UNUSED(arg);
 298
 299         return (ISC_R_NOTIMPLEMENTED);
 300 }
 301
 302 static inline isc_boolean_t
 303 checkowner_opt(ARGS_CHECKOWNER) {
 304
 305         REQUIRE(type == 41);
 306
 307         UNUSED(type);
 308         UNUSED(rdclass);
 309         UNUSED(wildcard);
 310
 311         return (dns_name_equal(name, dns_rootname));
 312 }
 313
 314 static inline isc_boolean_t
 315 checknames_opt(ARGS_CHECKNAMES) {
 316
 317         REQUIRE(rdata->type == 41);
 318
 319         UNUSED(rdata);
 320         UNUSED(owner);
 321         UNUSED(bad);
 322
 323         return (ISC_TRUE);
 324 }
 325
 326 static inline int
 327 casecompare_opt(ARGS_COMPARE) {
 328         return (compare_opt(rdata1, rdata2));
 329 }
 330
 331 isc_result_t
 332 dns_rdata_opt_first(dns_rdata_opt_t *opt) {
 333
 334         REQUIRE(opt != NULL);
 335         REQUIRE(opt->common.rdtype == 41);
 336         REQUIRE(opt->options != NULL || opt->length == 0);
 337
 338         if (opt->length == 0)
 339                 return (ISC_R_NOMORE);
 340
 341         opt->offset = 0;
 342         return (ISC_R_SUCCESS);
 343 }
 344
 345 isc_result_t
 346 dns_rdata_opt_next(dns_rdata_opt_t *opt) {
 347         isc_region_t r;
 348         isc_uint16_t length;
 349
 350         REQUIRE(opt != NULL);
 351         REQUIRE(opt->common.rdtype == 41);
 352         REQUIRE(opt->options != NULL && opt->length != 0);
 353         REQUIRE(opt->offset < opt->length);
 354
 355         INSIST(opt->offset + 4 <= opt->length);
 356         r.base = opt->options + opt->offset + 2;
 357         r.length = opt->length - opt->offset - 2;
 358         length = uint16_fromregion(&r);
 359         INSIST(opt->offset + 4 + length <= opt->length);
 360         opt->offset = opt->offset + 4 + length;
 361         if (opt->offset == opt->length)
 362                 return (ISC_R_NOMORE);
 363         return (ISC_R_SUCCESS);
 364 }
 365
 366 isc_result_t
 367 dns_rdata_opt_current(dns_rdata_opt_t *opt, dns_rdata_opt_opcode_t *opcode) {
 368         isc_region_t r;
 369
 370         REQUIRE(opt != NULL);
 371         REQUIRE(opcode != NULL);
 372         REQUIRE(opt->common.rdtype == 41);
 373         REQUIRE(opt->options != NULL);
 374         REQUIRE(opt->offset < opt->length);
 375
 376         INSIST(opt->offset + 4 <= opt->length);
 377         r.base = opt->options + opt->offset;
 378         r.length = opt->length - opt->offset;
 379
 380         opcode->opcode = uint16_fromregion(&r);
 381         isc_region_consume(&r, 2);
 382         opcode->length = uint16_fromregion(&r);
 383         isc_region_consume(&r, 2);
 384         opcode->data = r.base;
 385         INSIST(opt->offset + 4 + opcode->length <= opt->length);
 386
 387         return (ISC_R_SUCCESS);
 388 }
 389
 390 #endif  /* RDATA_GENERIC_OPT_41_C */