2 * Copyright (C) 2004, 2005, 2007, 2009, 2011-2015 Internet Systems Consortium, Inc. ("ISC")
3 * Copyright (C) 1998-2002 Internet Software Consortium.
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.
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.
20 /* Reviewed: Thu Mar 16 14:06:44 PST 2000 by gson */
24 #ifndef RDATA_GENERIC_OPT_41_C
25 #define RDATA_GENERIC_OPT_41_C
27 #define RRTYPE_OPT_ATTRIBUTES (DNS_RDATATYPEATTR_SINGLETON | \
28 DNS_RDATATYPEATTR_META | \
29 DNS_RDATATYPEATTR_NOTQUESTION)
31 static inline isc_result_t
32 fromtext_opt(ARGS_FROMTEXT) {
34 * OPT records do not have a text format.
37 REQUIRE(type == dns_rdatatype_opt);
47 return (ISC_R_NOTIMPLEMENTED);
50 static inline isc_result_t
51 totext_opt(ARGS_TOTEXT) {
56 char buf[sizeof("64000 64000")];
59 * OPT records do not have a text format.
62 REQUIRE(rdata->type == dns_rdatatype_opt);
64 dns_rdata_toregion(rdata, &r);
65 while (r.length > 0) {
66 option = uint16_fromregion(&r);
67 isc_region_consume(&r, 2);
68 length = uint16_fromregion(&r);
69 isc_region_consume(&r, 2);
70 sprintf(buf, "%u %u", option, length);
71 RETERR(str_totext(buf, target));
72 INSIST(r.length >= length);
74 if ((tctx->flags & DNS_STYLEFLAG_MULTILINE) != 0)
75 RETERR(str_totext(" (", target));
76 RETERR(str_totext(tctx->linebreak, target));
79 if (tctx->width == 0) /* No splitting */
80 RETERR(isc_base64_totext(&or, 60, "", target));
82 RETERR(isc_base64_totext(&or, tctx->width - 2,
85 isc_region_consume(&r, length);
86 if ((tctx->flags & DNS_STYLEFLAG_MULTILINE) != 0)
87 RETERR(str_totext(" )", target));
90 RETERR(str_totext(" ", target));
93 return (ISC_R_SUCCESS);
96 static inline isc_result_t
97 fromwire_opt(ARGS_FROMWIRE) {
104 REQUIRE(type == dns_rdatatype_opt);
111 isc_buffer_activeregion(source, &sregion);
113 while (sregion.length != 0) {
114 if (sregion.length < 4)
115 return (ISC_R_UNEXPECTEDEND);
116 opt = uint16_fromregion(&sregion);
117 isc_region_consume(&sregion, 2);
118 length = uint16_fromregion(&sregion);
119 isc_region_consume(&sregion, 2);
121 if (sregion.length < length)
122 return (ISC_R_UNEXPECTEDEND);
124 case DNS_OPT_CLIENT_SUBNET: {
128 isc_uint8_t addrbytes;
131 return (DNS_R_OPTERR);
132 family = uint16_fromregion(&sregion);
133 isc_region_consume(&sregion, 2);
134 addrlen = uint8_fromregion(&sregion);
135 isc_region_consume(&sregion, 1);
136 scope = uint8_fromregion(&sregion);
137 isc_region_consume(&sregion, 1);
140 if (addrlen > 32U || scope > 32U)
141 return (DNS_R_OPTERR);
144 if (addrlen > 128U || scope > 128U)
145 return (DNS_R_OPTERR);
148 return (DNS_R_OPTERR);
150 addrbytes = (addrlen + 7) / 8;
151 if (addrbytes + 4 != length)
152 return (DNS_R_OPTERR);
154 if (addrbytes != 0U && (addrlen % 8) != 0) {
155 isc_uint8_t bits = ~0 << (8 - (addrlen % 8));
156 bits &= sregion.base[addrbytes - 1];
157 if (bits != sregion.base[addrbytes - 1])
158 return (DNS_R_OPTERR);
160 isc_region_consume(&sregion, addrbytes);
165 * Request has zero length. Response is 32 bits.
167 if (length != 0 && length != 4)
168 return (DNS_R_OPTERR);
169 isc_region_consume(&sregion, length);
172 if (length != 8 && (length < 16 || length > 40))
173 return (DNS_R_OPTERR);
174 isc_region_consume(&sregion, length);
177 isc_region_consume(&sregion, length);
183 isc_buffer_activeregion(source, &sregion);
184 isc_buffer_availableregion(target, &tregion);
185 if (tregion.length < total)
186 return (ISC_R_NOSPACE);
187 memmove(tregion.base, sregion.base, total);
188 isc_buffer_forward(source, total);
189 isc_buffer_add(target, total);
191 return (ISC_R_SUCCESS);
194 static inline isc_result_t
195 towire_opt(ARGS_TOWIRE) {
197 REQUIRE(rdata->type == dns_rdatatype_opt);
201 return (mem_tobuffer(target, rdata->data, rdata->length));
205 compare_opt(ARGS_COMPARE) {
209 REQUIRE(rdata1->type == rdata2->type);
210 REQUIRE(rdata1->rdclass == rdata2->rdclass);
211 REQUIRE(rdata1->type == dns_rdatatype_opt);
213 dns_rdata_toregion(rdata1, &r1);
214 dns_rdata_toregion(rdata2, &r2);
215 return (isc_region_compare(&r1, &r2));
218 static inline isc_result_t
219 fromstruct_opt(ARGS_FROMSTRUCT) {
220 dns_rdata_opt_t *opt = source;
224 REQUIRE(type == dns_rdatatype_opt);
225 REQUIRE(source != NULL);
226 REQUIRE(opt->common.rdtype == type);
227 REQUIRE(opt->common.rdclass == rdclass);
228 REQUIRE(opt->options != NULL || opt->length == 0);
233 region.base = opt->options;
234 region.length = opt->length;
235 while (region.length >= 4) {
236 isc_region_consume(®ion, 2); /* opt */
237 length = uint16_fromregion(®ion);
238 isc_region_consume(®ion, 2);
239 if (region.length < length)
240 return (ISC_R_UNEXPECTEDEND);
241 isc_region_consume(®ion, length);
243 if (region.length != 0)
244 return (ISC_R_UNEXPECTEDEND);
246 return (mem_tobuffer(target, opt->options, opt->length));
249 static inline isc_result_t
250 tostruct_opt(ARGS_TOSTRUCT) {
251 dns_rdata_opt_t *opt = target;
254 REQUIRE(rdata->type == dns_rdatatype_opt);
255 REQUIRE(target != NULL);
257 opt->common.rdclass = rdata->rdclass;
258 opt->common.rdtype = rdata->type;
259 ISC_LINK_INIT(&opt->common, link);
261 dns_rdata_toregion(rdata, &r);
262 opt->length = r.length;
263 opt->options = mem_maybedup(mctx, r.base, r.length);
264 if (opt->options == NULL)
265 return (ISC_R_NOMEMORY);
269 return (ISC_R_SUCCESS);
273 freestruct_opt(ARGS_FREESTRUCT) {
274 dns_rdata_opt_t *opt = source;
276 REQUIRE(source != NULL);
277 REQUIRE(opt->common.rdtype == dns_rdatatype_opt);
279 if (opt->mctx == NULL)
282 if (opt->options != NULL)
283 isc_mem_free(opt->mctx, opt->options);
287 static inline isc_result_t
288 additionaldata_opt(ARGS_ADDLDATA) {
289 REQUIRE(rdata->type == dns_rdatatype_opt);
295 return (ISC_R_SUCCESS);
298 static inline isc_result_t
299 digest_opt(ARGS_DIGEST) {
302 * OPT records are not digested.
305 REQUIRE(rdata->type == dns_rdatatype_opt);
311 return (ISC_R_NOTIMPLEMENTED);
314 static inline isc_boolean_t
315 checkowner_opt(ARGS_CHECKOWNER) {
317 REQUIRE(type == dns_rdatatype_opt);
323 return (dns_name_equal(name, dns_rootname));
326 static inline isc_boolean_t
327 checknames_opt(ARGS_CHECKNAMES) {
329 REQUIRE(rdata->type == dns_rdatatype_opt);
339 casecompare_opt(ARGS_COMPARE) {
340 return (compare_opt(rdata1, rdata2));
344 dns_rdata_opt_first(dns_rdata_opt_t *opt) {
346 REQUIRE(opt != NULL);
347 REQUIRE(opt->common.rdtype == dns_rdatatype_opt);
348 REQUIRE(opt->options != NULL || opt->length == 0);
350 if (opt->length == 0)
351 return (ISC_R_NOMORE);
354 return (ISC_R_SUCCESS);
358 dns_rdata_opt_next(dns_rdata_opt_t *opt) {
362 REQUIRE(opt != NULL);
363 REQUIRE(opt->common.rdtype == dns_rdatatype_opt);
364 REQUIRE(opt->options != NULL && opt->length != 0);
365 REQUIRE(opt->offset < opt->length);
367 INSIST(opt->offset + 4 <= opt->length);
368 r.base = opt->options + opt->offset + 2;
369 r.length = opt->length - opt->offset - 2;
370 length = uint16_fromregion(&r);
371 INSIST(opt->offset + 4 + length <= opt->length);
372 opt->offset = opt->offset + 4 + length;
373 if (opt->offset == opt->length)
374 return (ISC_R_NOMORE);
375 return (ISC_R_SUCCESS);
379 dns_rdata_opt_current(dns_rdata_opt_t *opt, dns_rdata_opt_opcode_t *opcode) {
382 REQUIRE(opt != NULL);
383 REQUIRE(opcode != NULL);
384 REQUIRE(opt->common.rdtype == dns_rdatatype_opt);
385 REQUIRE(opt->options != NULL);
386 REQUIRE(opt->offset < opt->length);
388 INSIST(opt->offset + 4 <= opt->length);
389 r.base = opt->options + opt->offset;
390 r.length = opt->length - opt->offset;
392 opcode->opcode = uint16_fromregion(&r);
393 isc_region_consume(&r, 2);
394 opcode->length = uint16_fromregion(&r);
395 isc_region_consume(&r, 2);
396 opcode->data = r.base;
397 INSIST(opt->offset + 4 + opcode->length <= opt->length);
399 return (ISC_R_SUCCESS);
402 #endif /* RDATA_GENERIC_OPT_41_C */