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-rw-r--r--lib/dns/rdata/generic/opt_41.c472
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diff --git a/lib/dns/rdata/generic/opt_41.c b/lib/dns/rdata/generic/opt_41.c
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+++ b/lib/dns/rdata/generic/opt_41.c
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+/*
+ * 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(&region, 2); /* opt */
+ length = uint16_fromregion(&region);
+ isc_region_consume(&region, 2);
+ if (region.length < length) {
+ return (ISC_R_UNEXPECTEDEND);
+ }
+ isc_region_consume(&region, 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 */