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

   1 /*      $NetBSD$        */
   2
   3 /*
   4  * Copyright (C) 2004, 2005, 2007, 2009  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: opt_41.c,v 1.35 2009/12/04 22:06:37 tbox Exp */
  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                         RETERR(isc_base64_totext(&or, tctx->width - 2,
  82                                                  tctx->linebreak, target));
  83                         isc_region_consume(&r, length);
  84                         if ((tctx->flags & DNS_STYLEFLAG_MULTILINE) != 0)
  85                                 RETERR(str_totext(" )", target));
  86                 }
  87                 if (r.length > 0)
  88                         RETERR(str_totext(" ", target));
  89         }
  90
  91         return (ISC_R_SUCCESS);
  92 }
  93
  94 static inline isc_result_t
  95 fromwire_opt(ARGS_FROMWIRE) {
  96         isc_region_t sregion;
  97         isc_region_t tregion;
  98         isc_uint16_t length;
  99         unsigned int total;
 100
 101         REQUIRE(type == 41);
 102
 103         UNUSED(type);
 104         UNUSED(rdclass);
 105         UNUSED(dctx);
 106         UNUSED(options);
 107
 108         isc_buffer_activeregion(source, &sregion);
 109         total = 0;
 110         while (sregion.length != 0) {
 111                 if (sregion.length < 4)
 112                         return (ISC_R_UNEXPECTEDEND);
 113                 /*
 114                  * Eat the 16bit option code.  There is nothing to
 115                  * be done with it currently.
 116                  */
 117                 isc_region_consume(&sregion, 2);
 118                 length = uint16_fromregion(&sregion);
 119                 isc_region_consume(&sregion, 2);
 120                 total += 4;
 121                 if (sregion.length < length)
 122                         return (ISC_R_UNEXPECTEDEND);
 123                 isc_region_consume(&sregion, length);
 124                 total += length;
 125         }
 126
 127         isc_buffer_activeregion(source, &sregion);
 128         isc_buffer_availableregion(target, &tregion);
 129         if (tregion.length < total)
 130                 return (ISC_R_NOSPACE);
 131         memcpy(tregion.base, sregion.base, total);
 132         isc_buffer_forward(source, total);
 133         isc_buffer_add(target, total);
 134
 135         return (ISC_R_SUCCESS);
 136 }
 137
 138 static inline isc_result_t
 139 towire_opt(ARGS_TOWIRE) {
 140
 141         REQUIRE(rdata->type == 41);
 142
 143         UNUSED(cctx);
 144
 145         return (mem_tobuffer(target, rdata->data, rdata->length));
 146 }
 147
 148 static inline int
 149 compare_opt(ARGS_COMPARE) {
 150         isc_region_t r1;
 151         isc_region_t r2;
 152
 153         REQUIRE(rdata1->type == rdata2->type);
 154         REQUIRE(rdata1->rdclass == rdata2->rdclass);
 155         REQUIRE(rdata1->type == 41);
 156
 157         dns_rdata_toregion(rdata1, &r1);
 158         dns_rdata_toregion(rdata2, &r2);
 159         return (isc_region_compare(&r1, &r2));
 160 }
 161
 162 static inline isc_result_t
 163 fromstruct_opt(ARGS_FROMSTRUCT) {
 164         dns_rdata_opt_t *opt = source;
 165         isc_region_t region;
 166         isc_uint16_t length;
 167
 168         REQUIRE(type == 41);
 169         REQUIRE(source != NULL);
 170         REQUIRE(opt->common.rdtype == type);
 171         REQUIRE(opt->common.rdclass == rdclass);
 172         REQUIRE(opt->options != NULL || opt->length == 0);
 173
 174         UNUSED(type);
 175         UNUSED(rdclass);
 176
 177         region.base = opt->options;
 178         region.length = opt->length;
 179         while (region.length >= 4) {
 180                 isc_region_consume(&region, 2); /* opt */
 181                 length = uint16_fromregion(&region);
 182                 isc_region_consume(&region, 2);
 183                 if (region.length < length)
 184                         return (ISC_R_UNEXPECTEDEND);
 185                 isc_region_consume(&region, length);
 186         }
 187         if (region.length != 0)
 188                 return (ISC_R_UNEXPECTEDEND);
 189
 190         return (mem_tobuffer(target, opt->options, opt->length));
 191 }
 192
 193 static inline isc_result_t
 194 tostruct_opt(ARGS_TOSTRUCT) {
 195         dns_rdata_opt_t *opt = target;
 196         isc_region_t r;
 197
 198         REQUIRE(rdata->type == 41);
 199         REQUIRE(target != NULL);
 200
 201         opt->common.rdclass = rdata->rdclass;
 202         opt->common.rdtype = rdata->type;
 203         ISC_LINK_INIT(&opt->common, link);
 204
 205         dns_rdata_toregion(rdata, &r);
 206         opt->length = r.length;
 207         opt->options = mem_maybedup(mctx, r.base, r.length);
 208         if (opt->options == NULL)
 209                 return (ISC_R_NOMEMORY);
 210
 211         opt->offset = 0;
 212         opt->mctx = mctx;
 213         return (ISC_R_SUCCESS);
 214 }
 215
 216 static inline void
 217 freestruct_opt(ARGS_FREESTRUCT) {
 218         dns_rdata_opt_t *opt = source;
 219
 220         REQUIRE(source != NULL);
 221         REQUIRE(opt->common.rdtype == 41);
 222
 223         if (opt->mctx == NULL)
 224                 return;
 225
 226         if (opt->options != NULL)
 227                 isc_mem_free(opt->mctx, opt->options);
 228         opt->mctx = NULL;
 229 }
 230
 231 static inline isc_result_t
 232 additionaldata_opt(ARGS_ADDLDATA) {
 233         REQUIRE(rdata->type == 41);
 234
 235         UNUSED(rdata);
 236         UNUSED(add);
 237         UNUSED(arg);
 238
 239         return (ISC_R_SUCCESS);
 240 }
 241
 242 static inline isc_result_t
 243 digest_opt(ARGS_DIGEST) {
 244
 245         /*
 246          * OPT records are not digested.
 247          */
 248
 249         REQUIRE(rdata->type == 41);
 250
 251         UNUSED(rdata);
 252         UNUSED(digest);
 253         UNUSED(arg);
 254
 255         return (ISC_R_NOTIMPLEMENTED);
 256 }
 257
 258 static inline isc_boolean_t
 259 checkowner_opt(ARGS_CHECKOWNER) {
 260
 261         REQUIRE(type == 41);
 262
 263         UNUSED(type);
 264         UNUSED(rdclass);
 265         UNUSED(wildcard);
 266
 267         return (dns_name_equal(name, dns_rootname));
 268 }
 269
 270 static inline isc_boolean_t
 271 checknames_opt(ARGS_CHECKNAMES) {
 272
 273         REQUIRE(rdata->type == 41);
 274
 275         UNUSED(rdata);
 276         UNUSED(owner);
 277         UNUSED(bad);
 278
 279         return (ISC_TRUE);
 280 }
 281
 282 static inline int
 283 casecompare_opt(ARGS_COMPARE) {
 284         return (compare_opt(rdata1, rdata2));
 285 }
 286
 287 #endif  /* RDATA_GENERIC_OPT_41_C */