Adding upstream version 1:9.16.44.upstream/1%9.16.44upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

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(&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 */