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Diffstat (limited to '')
| -rw-r--r-- | lib/dns/rdata/generic/opt_41.c | 472 |
1 files changed, 472 insertions, 0 deletions
diff --git a/lib/dns/rdata/generic/opt_41.c b/lib/dns/rdata/generic/opt_41.c new file mode 100644 index 0000000..8aa7b52 --- /dev/null +++ b/lib/dns/rdata/generic/opt_41.c @@ -0,0 +1,472 @@ +/* + * Copyright (C) Internet Systems Consortium, Inc. ("ISC") + * + * SPDX-License-Identifier: MPL-2.0 + * + * This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, you can obtain one at https://mozilla.org/MPL/2.0/. + * + * See the COPYRIGHT file distributed with this work for additional + * information regarding copyright ownership. + */ + +/* RFC2671 */ + +#ifndef RDATA_GENERIC_OPT_41_C +#define RDATA_GENERIC_OPT_41_C + +#define RRTYPE_OPT_ATTRIBUTES \ + (DNS_RDATATYPEATTR_SINGLETON | DNS_RDATATYPEATTR_META | \ + DNS_RDATATYPEATTR_NOTQUESTION) + +#include <isc/utf8.h> + +static isc_result_t +fromtext_opt(ARGS_FROMTEXT) { + /* + * OPT records do not have a text format. + */ + + REQUIRE(type == dns_rdatatype_opt); + + UNUSED(type); + UNUSED(rdclass); + UNUSED(lexer); + UNUSED(origin); + UNUSED(options); + UNUSED(target); + UNUSED(callbacks); + + return (ISC_R_NOTIMPLEMENTED); +} + +static isc_result_t +totext_opt(ARGS_TOTEXT) { + isc_region_t r; + isc_region_t or ; + uint16_t option; + uint16_t length; + char buf[sizeof("64000 64000")]; + + /* + * OPT records do not have a text format. + */ + + REQUIRE(rdata->type == dns_rdatatype_opt); + + dns_rdata_toregion(rdata, &r); + while (r.length > 0) { + option = uint16_fromregion(&r); + isc_region_consume(&r, 2); + length = uint16_fromregion(&r); + isc_region_consume(&r, 2); + snprintf(buf, sizeof(buf), "%u %u", option, length); + RETERR(str_totext(buf, target)); + INSIST(r.length >= length); + if (length > 0) { + if ((tctx->flags & DNS_STYLEFLAG_MULTILINE) != 0) { + RETERR(str_totext(" (", target)); + } + RETERR(str_totext(tctx->linebreak, target)); + or = r; + or.length = length; + if (tctx->width == 0) { /* No splitting */ + RETERR(isc_base64_totext(& or, 60, "", target)); + } else { + RETERR(isc_base64_totext(& or, tctx->width - 2, + tctx->linebreak, + target)); + } + isc_region_consume(&r, length); + if ((tctx->flags & DNS_STYLEFLAG_MULTILINE) != 0) { + RETERR(str_totext(" )", target)); + } + } + if (r.length > 0) { + RETERR(str_totext(" ", target)); + } + } + + return (ISC_R_SUCCESS); +} + +static isc_result_t +fromwire_opt(ARGS_FROMWIRE) { + isc_region_t sregion; + isc_region_t tregion; + uint16_t opt; + uint16_t length; + unsigned int total; + + REQUIRE(type == dns_rdatatype_opt); + + UNUSED(type); + UNUSED(rdclass); + UNUSED(dctx); + UNUSED(options); + + isc_buffer_activeregion(source, &sregion); + if (sregion.length == 0) { + return (ISC_R_SUCCESS); + } + total = 0; + while (sregion.length != 0) { + if (sregion.length < 4) { + return (ISC_R_UNEXPECTEDEND); + } + opt = uint16_fromregion(&sregion); + isc_region_consume(&sregion, 2); + length = uint16_fromregion(&sregion); + isc_region_consume(&sregion, 2); + total += 4; + if (sregion.length < length) { + return (ISC_R_UNEXPECTEDEND); + } + switch (opt) { + case DNS_OPT_LLQ: + if (length != 18U) { + return (DNS_R_OPTERR); + } + isc_region_consume(&sregion, length); + break; + case DNS_OPT_CLIENT_SUBNET: { + uint16_t family; + uint8_t addrlen; + uint8_t scope; + uint8_t addrbytes; + + if (length < 4) { + return (DNS_R_OPTERR); + } + family = uint16_fromregion(&sregion); + isc_region_consume(&sregion, 2); + addrlen = uint8_fromregion(&sregion); + isc_region_consume(&sregion, 1); + scope = uint8_fromregion(&sregion); + isc_region_consume(&sregion, 1); + + switch (family) { + case 0: + /* + * XXXMUKS: In queries and replies, if + * FAMILY is set to 0, SOURCE + * PREFIX-LENGTH and SCOPE PREFIX-LENGTH + * must be 0 and ADDRESS should not be + * present as the address and prefix + * lengths don't make sense because the + * family is unknown. + */ + if (addrlen != 0U || scope != 0U) { + return (DNS_R_OPTERR); + } + break; + case 1: + if (addrlen > 32U || scope > 32U) { + return (DNS_R_OPTERR); + } + break; + case 2: + if (addrlen > 128U || scope > 128U) { + return (DNS_R_OPTERR); + } + break; + default: + return (DNS_R_OPTERR); + } + addrbytes = (addrlen + 7) / 8; + if (addrbytes + 4 != length) { + return (DNS_R_OPTERR); + } + + if (addrbytes != 0U && (addrlen % 8) != 0) { + uint8_t bits = ~0U << (8 - (addrlen % 8)); + bits &= sregion.base[addrbytes - 1]; + if (bits != sregion.base[addrbytes - 1]) { + return (DNS_R_OPTERR); + } + } + isc_region_consume(&sregion, addrbytes); + break; + } + case DNS_OPT_EXPIRE: + /* + * Request has zero length. Response is 32 bits. + */ + if (length != 0 && length != 4) { + return (DNS_R_OPTERR); + } + isc_region_consume(&sregion, length); + break; + case DNS_OPT_COOKIE: + /* + * Client cookie alone has length 8. + * Client + server cookie is 8 + [8..32]. + */ + if (length != 8 && (length < 16 || length > 40)) { + return (DNS_R_OPTERR); + } + isc_region_consume(&sregion, length); + break; + case DNS_OPT_KEY_TAG: + if (length == 0 || (length % 2) != 0) { + return (DNS_R_OPTERR); + } + isc_region_consume(&sregion, length); + break; + case DNS_OPT_EDE: + if (length < 2) { + return (DNS_R_OPTERR); + } + /* UTF-8 Byte Order Mark is not permitted. RFC 5198 */ + if (isc_utf8_bom(sregion.base + 2, length - 2)) { + return (DNS_R_OPTERR); + } + /* + * The EXTRA-TEXT field is specified as UTF-8, and + * therefore must be validated for correctness + * according to RFC 3269 security considerations. + */ + if (!isc_utf8_valid(sregion.base + 2, length - 2)) { + return (DNS_R_OPTERR); + } + isc_region_consume(&sregion, length); + break; + case DNS_OPT_CLIENT_TAG: + FALLTHROUGH; + case DNS_OPT_SERVER_TAG: + if (length != 2) { + return (DNS_R_OPTERR); + } + isc_region_consume(&sregion, length); + break; + default: + isc_region_consume(&sregion, length); + break; + } + total += length; + } + + isc_buffer_activeregion(source, &sregion); + isc_buffer_availableregion(target, &tregion); + if (tregion.length < total) { + return (ISC_R_NOSPACE); + } + memmove(tregion.base, sregion.base, total); + isc_buffer_forward(source, total); + isc_buffer_add(target, total); + + return (ISC_R_SUCCESS); +} + +static isc_result_t +towire_opt(ARGS_TOWIRE) { + REQUIRE(rdata->type == dns_rdatatype_opt); + + UNUSED(cctx); + + return (mem_tobuffer(target, rdata->data, rdata->length)); +} + +static int +compare_opt(ARGS_COMPARE) { + isc_region_t r1; + isc_region_t r2; + + REQUIRE(rdata1->type == rdata2->type); + REQUIRE(rdata1->rdclass == rdata2->rdclass); + REQUIRE(rdata1->type == dns_rdatatype_opt); + + dns_rdata_toregion(rdata1, &r1); + dns_rdata_toregion(rdata2, &r2); + return (isc_region_compare(&r1, &r2)); +} + +static isc_result_t +fromstruct_opt(ARGS_FROMSTRUCT) { + dns_rdata_opt_t *opt = source; + isc_region_t region; + uint16_t length; + + REQUIRE(type == dns_rdatatype_opt); + REQUIRE(opt != NULL); + REQUIRE(opt->common.rdtype == type); + REQUIRE(opt->common.rdclass == rdclass); + REQUIRE(opt->options != NULL || opt->length == 0); + + UNUSED(type); + UNUSED(rdclass); + + region.base = opt->options; + region.length = opt->length; + while (region.length >= 4) { + isc_region_consume(®ion, 2); /* opt */ + length = uint16_fromregion(®ion); + isc_region_consume(®ion, 2); + if (region.length < length) { + return (ISC_R_UNEXPECTEDEND); + } + isc_region_consume(®ion, length); + } + if (region.length != 0) { + return (ISC_R_UNEXPECTEDEND); + } + + return (mem_tobuffer(target, opt->options, opt->length)); +} + +static isc_result_t +tostruct_opt(ARGS_TOSTRUCT) { + dns_rdata_opt_t *opt = target; + isc_region_t r; + + REQUIRE(rdata->type == dns_rdatatype_opt); + REQUIRE(opt != NULL); + + opt->common.rdclass = rdata->rdclass; + opt->common.rdtype = rdata->type; + ISC_LINK_INIT(&opt->common, link); + + dns_rdata_toregion(rdata, &r); + opt->length = r.length; + opt->options = mem_maybedup(mctx, r.base, r.length); + if (opt->options == NULL) { + return (ISC_R_NOMEMORY); + } + + opt->offset = 0; + opt->mctx = mctx; + return (ISC_R_SUCCESS); +} + +static void +freestruct_opt(ARGS_FREESTRUCT) { + dns_rdata_opt_t *opt = source; + + REQUIRE(opt != NULL); + REQUIRE(opt->common.rdtype == dns_rdatatype_opt); + + if (opt->mctx == NULL) { + return; + } + + if (opt->options != NULL) { + isc_mem_free(opt->mctx, opt->options); + } + opt->mctx = NULL; +} + +static isc_result_t +additionaldata_opt(ARGS_ADDLDATA) { + REQUIRE(rdata->type == dns_rdatatype_opt); + + UNUSED(rdata); + UNUSED(add); + UNUSED(arg); + + return (ISC_R_SUCCESS); +} + +static isc_result_t +digest_opt(ARGS_DIGEST) { + /* + * OPT records are not digested. + */ + + REQUIRE(rdata->type == dns_rdatatype_opt); + + UNUSED(rdata); + UNUSED(digest); + UNUSED(arg); + + return (ISC_R_NOTIMPLEMENTED); +} + +static bool +checkowner_opt(ARGS_CHECKOWNER) { + REQUIRE(type == dns_rdatatype_opt); + + UNUSED(type); + UNUSED(rdclass); + UNUSED(wildcard); + + return (dns_name_equal(name, dns_rootname)); +} + +static bool +checknames_opt(ARGS_CHECKNAMES) { + REQUIRE(rdata->type == dns_rdatatype_opt); + + UNUSED(rdata); + UNUSED(owner); + UNUSED(bad); + + return (true); +} + +static int +casecompare_opt(ARGS_COMPARE) { + return (compare_opt(rdata1, rdata2)); +} + +isc_result_t +dns_rdata_opt_first(dns_rdata_opt_t *opt) { + REQUIRE(opt != NULL); + REQUIRE(opt->common.rdtype == dns_rdatatype_opt); + REQUIRE(opt->options != NULL || opt->length == 0); + + if (opt->length == 0) { + return (ISC_R_NOMORE); + } + + opt->offset = 0; + return (ISC_R_SUCCESS); +} + +isc_result_t +dns_rdata_opt_next(dns_rdata_opt_t *opt) { + isc_region_t r; + uint16_t length; + + REQUIRE(opt != NULL); + REQUIRE(opt->common.rdtype == dns_rdatatype_opt); + REQUIRE(opt->options != NULL && opt->length != 0); + REQUIRE(opt->offset < opt->length); + + INSIST(opt->offset + 4 <= opt->length); + r.base = opt->options + opt->offset + 2; + r.length = opt->length - opt->offset - 2; + length = uint16_fromregion(&r); + INSIST(opt->offset + 4 + length <= opt->length); + opt->offset = opt->offset + 4 + length; + if (opt->offset == opt->length) { + return (ISC_R_NOMORE); + } + return (ISC_R_SUCCESS); +} + +isc_result_t +dns_rdata_opt_current(dns_rdata_opt_t *opt, dns_rdata_opt_opcode_t *opcode) { + isc_region_t r; + + REQUIRE(opt != NULL); + REQUIRE(opcode != NULL); + REQUIRE(opt->common.rdtype == dns_rdatatype_opt); + REQUIRE(opt->options != NULL); + REQUIRE(opt->offset < opt->length); + + INSIST(opt->offset + 4 <= opt->length); + r.base = opt->options + opt->offset; + r.length = opt->length - opt->offset; + + opcode->opcode = uint16_fromregion(&r); + isc_region_consume(&r, 2); + opcode->length = uint16_fromregion(&r); + isc_region_consume(&r, 2); + opcode->data = r.base; + INSIST(opt->offset + 4 + opcode->length <= opt->length); + + return (ISC_R_SUCCESS); +} + +#endif /* RDATA_GENERIC_OPT_41_C */ |