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-rw-r--r--lib/dns/rdatalist.c448
1 files changed, 448 insertions, 0 deletions
diff --git a/lib/dns/rdatalist.c b/lib/dns/rdatalist.c
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+++ b/lib/dns/rdatalist.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.
+ */
+
+/*! \file */
+
+#include <stddef.h>
+#include <string.h>
+
+#include <isc/util.h>
+
+#include <dns/name.h>
+#include <dns/nsec3.h>
+#include <dns/rdata.h>
+#include <dns/rdatalist.h>
+#include <dns/rdataset.h>
+
+#include "rdatalist_p.h"
+
+static dns_rdatasetmethods_t methods = {
+ isc__rdatalist_disassociate,
+ isc__rdatalist_first,
+ isc__rdatalist_next,
+ isc__rdatalist_current,
+ isc__rdatalist_clone,
+ isc__rdatalist_count,
+ isc__rdatalist_addnoqname,
+ isc__rdatalist_getnoqname,
+ isc__rdatalist_addclosest,
+ isc__rdatalist_getclosest,
+ NULL, /* settrust */
+ NULL, /* expire */
+ NULL, /* clearprefetch */
+ isc__rdatalist_setownercase,
+ isc__rdatalist_getownercase,
+ NULL /* addglue */
+};
+
+void
+dns_rdatalist_init(dns_rdatalist_t *rdatalist) {
+ REQUIRE(rdatalist != NULL);
+
+ /*
+ * Initialize rdatalist.
+ */
+
+ rdatalist->rdclass = 0;
+ rdatalist->type = 0;
+ rdatalist->covers = 0;
+ rdatalist->ttl = 0;
+ ISC_LIST_INIT(rdatalist->rdata);
+ ISC_LINK_INIT(rdatalist, link);
+ memset(rdatalist->upper, 0xeb, sizeof(rdatalist->upper));
+ /*
+ * Clear upper set bit.
+ */
+ rdatalist->upper[0] &= ~0x01;
+}
+
+isc_result_t
+dns_rdatalist_tordataset(dns_rdatalist_t *rdatalist, dns_rdataset_t *rdataset) {
+ /*
+ * Make 'rdataset' refer to the rdata in 'rdatalist'.
+ */
+
+ REQUIRE(rdatalist != NULL);
+ REQUIRE(DNS_RDATASET_VALID(rdataset));
+ REQUIRE(!dns_rdataset_isassociated(rdataset));
+
+ /* Check if dns_rdatalist_init has was called. */
+ REQUIRE(rdatalist->upper[0] == 0xea);
+
+ rdataset->methods = &methods;
+ rdataset->rdclass = rdatalist->rdclass;
+ rdataset->type = rdatalist->type;
+ rdataset->covers = rdatalist->covers;
+ rdataset->ttl = rdatalist->ttl;
+ rdataset->trust = 0;
+ rdataset->private1 = rdatalist;
+ rdataset->private2 = NULL;
+ rdataset->private3 = NULL;
+ rdataset->privateuint4 = 0;
+ rdataset->private5 = NULL;
+
+ return (ISC_R_SUCCESS);
+}
+
+isc_result_t
+dns_rdatalist_fromrdataset(dns_rdataset_t *rdataset,
+ dns_rdatalist_t **rdatalist) {
+ REQUIRE(rdatalist != NULL && rdataset != NULL);
+ *rdatalist = rdataset->private1;
+
+ return (ISC_R_SUCCESS);
+}
+
+void
+isc__rdatalist_disassociate(dns_rdataset_t *rdataset) {
+ UNUSED(rdataset);
+}
+
+isc_result_t
+isc__rdatalist_first(dns_rdataset_t *rdataset) {
+ dns_rdatalist_t *rdatalist;
+
+ rdatalist = rdataset->private1;
+ rdataset->private2 = ISC_LIST_HEAD(rdatalist->rdata);
+
+ if (rdataset->private2 == NULL) {
+ return (ISC_R_NOMORE);
+ }
+
+ return (ISC_R_SUCCESS);
+}
+
+isc_result_t
+isc__rdatalist_next(dns_rdataset_t *rdataset) {
+ dns_rdata_t *rdata;
+
+ REQUIRE(rdataset != NULL);
+
+ rdata = rdataset->private2;
+ if (rdata == NULL) {
+ return (ISC_R_NOMORE);
+ }
+
+ rdataset->private2 = ISC_LIST_NEXT(rdata, link);
+
+ if (rdataset->private2 == NULL) {
+ return (ISC_R_NOMORE);
+ }
+
+ return (ISC_R_SUCCESS);
+}
+
+void
+isc__rdatalist_current(dns_rdataset_t *rdataset, dns_rdata_t *rdata) {
+ dns_rdata_t *list_rdata;
+
+ REQUIRE(rdataset != NULL);
+
+ list_rdata = rdataset->private2;
+ INSIST(list_rdata != NULL);
+
+ dns_rdata_clone(list_rdata, rdata);
+}
+
+void
+isc__rdatalist_clone(dns_rdataset_t *source, dns_rdataset_t *target) {
+ REQUIRE(source != NULL);
+ REQUIRE(target != NULL);
+
+ *target = *source;
+
+ /*
+ * Reset iterator state.
+ */
+ target->private2 = NULL;
+}
+
+unsigned int
+isc__rdatalist_count(dns_rdataset_t *rdataset) {
+ dns_rdatalist_t *rdatalist;
+ dns_rdata_t *rdata;
+ unsigned int count;
+
+ REQUIRE(rdataset != NULL);
+
+ rdatalist = rdataset->private1;
+
+ count = 0;
+ for (rdata = ISC_LIST_HEAD(rdatalist->rdata); rdata != NULL;
+ rdata = ISC_LIST_NEXT(rdata, link))
+ {
+ count++;
+ }
+
+ return (count);
+}
+
+isc_result_t
+isc__rdatalist_addnoqname(dns_rdataset_t *rdataset, const dns_name_t *name) {
+ dns_rdataset_t *neg = NULL;
+ dns_rdataset_t *negsig = NULL;
+ dns_rdataset_t *rdset;
+ dns_ttl_t ttl;
+
+ REQUIRE(rdataset != NULL);
+
+ for (rdset = ISC_LIST_HEAD(name->list); rdset != NULL;
+ rdset = ISC_LIST_NEXT(rdset, link))
+ {
+ if (rdset->rdclass != rdataset->rdclass) {
+ continue;
+ }
+ if (rdset->type == dns_rdatatype_nsec ||
+ rdset->type == dns_rdatatype_nsec3)
+ {
+ neg = rdset;
+ }
+ }
+ if (neg == NULL) {
+ return (ISC_R_NOTFOUND);
+ }
+
+ for (rdset = ISC_LIST_HEAD(name->list); rdset != NULL;
+ rdset = ISC_LIST_NEXT(rdset, link))
+ {
+ if (rdset->type == dns_rdatatype_rrsig &&
+ rdset->covers == neg->type)
+ {
+ negsig = rdset;
+ }
+ }
+
+ if (negsig == NULL) {
+ return (ISC_R_NOTFOUND);
+ }
+ /*
+ * Minimise ttl.
+ */
+ ttl = rdataset->ttl;
+ if (neg->ttl < ttl) {
+ ttl = neg->ttl;
+ }
+ if (negsig->ttl < ttl) {
+ ttl = negsig->ttl;
+ }
+ rdataset->ttl = neg->ttl = negsig->ttl = ttl;
+ rdataset->attributes |= DNS_RDATASETATTR_NOQNAME;
+ rdataset->private6 = name;
+ return (ISC_R_SUCCESS);
+}
+
+isc_result_t
+isc__rdatalist_getnoqname(dns_rdataset_t *rdataset, dns_name_t *name,
+ dns_rdataset_t *neg, dns_rdataset_t *negsig) {
+ dns_rdataclass_t rdclass;
+ dns_rdataset_t *tneg = NULL;
+ dns_rdataset_t *tnegsig = NULL;
+ const dns_name_t *noqname;
+
+ REQUIRE(rdataset != NULL);
+ REQUIRE((rdataset->attributes & DNS_RDATASETATTR_NOQNAME) != 0);
+
+ rdclass = rdataset->rdclass;
+ noqname = rdataset->private6;
+
+ (void)dns_name_dynamic(noqname); /* Sanity Check. */
+
+ for (rdataset = ISC_LIST_HEAD(noqname->list); rdataset != NULL;
+ rdataset = ISC_LIST_NEXT(rdataset, link))
+ {
+ if (rdataset->rdclass != rdclass) {
+ continue;
+ }
+ if (rdataset->type == dns_rdatatype_nsec ||
+ rdataset->type == dns_rdatatype_nsec3)
+ {
+ tneg = rdataset;
+ }
+ }
+ if (tneg == NULL) {
+ return (ISC_R_NOTFOUND);
+ }
+
+ for (rdataset = ISC_LIST_HEAD(noqname->list); rdataset != NULL;
+ rdataset = ISC_LIST_NEXT(rdataset, link))
+ {
+ if (rdataset->type == dns_rdatatype_rrsig &&
+ rdataset->covers == tneg->type)
+ {
+ tnegsig = rdataset;
+ }
+ }
+ if (tnegsig == NULL) {
+ return (ISC_R_NOTFOUND);
+ }
+
+ dns_name_clone(noqname, name);
+ dns_rdataset_clone(tneg, neg);
+ dns_rdataset_clone(tnegsig, negsig);
+ return (ISC_R_SUCCESS);
+}
+
+isc_result_t
+isc__rdatalist_addclosest(dns_rdataset_t *rdataset, const dns_name_t *name) {
+ dns_rdataset_t *neg = NULL;
+ dns_rdataset_t *negsig = NULL;
+ dns_rdataset_t *rdset;
+ dns_ttl_t ttl;
+
+ REQUIRE(rdataset != NULL);
+
+ for (rdset = ISC_LIST_HEAD(name->list); rdset != NULL;
+ rdset = ISC_LIST_NEXT(rdset, link))
+ {
+ if (rdset->rdclass != rdataset->rdclass) {
+ continue;
+ }
+ if (rdset->type == dns_rdatatype_nsec ||
+ rdset->type == dns_rdatatype_nsec3)
+ {
+ neg = rdset;
+ }
+ }
+ if (neg == NULL) {
+ return (ISC_R_NOTFOUND);
+ }
+
+ for (rdset = ISC_LIST_HEAD(name->list); rdset != NULL;
+ rdset = ISC_LIST_NEXT(rdset, link))
+ {
+ if (rdset->type == dns_rdatatype_rrsig &&
+ rdset->covers == neg->type)
+ {
+ negsig = rdset;
+ }
+ }
+
+ if (negsig == NULL) {
+ return (ISC_R_NOTFOUND);
+ }
+ /*
+ * Minimise ttl.
+ */
+ ttl = rdataset->ttl;
+ if (neg->ttl < ttl) {
+ ttl = neg->ttl;
+ }
+ if (negsig->ttl < ttl) {
+ ttl = negsig->ttl;
+ }
+ rdataset->ttl = neg->ttl = negsig->ttl = ttl;
+ rdataset->attributes |= DNS_RDATASETATTR_CLOSEST;
+ rdataset->private7 = name;
+ return (ISC_R_SUCCESS);
+}
+
+isc_result_t
+isc__rdatalist_getclosest(dns_rdataset_t *rdataset, dns_name_t *name,
+ dns_rdataset_t *neg, dns_rdataset_t *negsig) {
+ dns_rdataclass_t rdclass;
+ dns_rdataset_t *tneg = NULL;
+ dns_rdataset_t *tnegsig = NULL;
+ const dns_name_t *closest;
+
+ REQUIRE(rdataset != NULL);
+ REQUIRE((rdataset->attributes & DNS_RDATASETATTR_CLOSEST) != 0);
+
+ rdclass = rdataset->rdclass;
+ closest = rdataset->private7;
+
+ (void)dns_name_dynamic(closest); /* Sanity Check. */
+
+ for (rdataset = ISC_LIST_HEAD(closest->list); rdataset != NULL;
+ rdataset = ISC_LIST_NEXT(rdataset, link))
+ {
+ if (rdataset->rdclass != rdclass) {
+ continue;
+ }
+ if (rdataset->type == dns_rdatatype_nsec ||
+ rdataset->type == dns_rdatatype_nsec3)
+ {
+ tneg = rdataset;
+ }
+ }
+ if (tneg == NULL) {
+ return (ISC_R_NOTFOUND);
+ }
+
+ for (rdataset = ISC_LIST_HEAD(closest->list); rdataset != NULL;
+ rdataset = ISC_LIST_NEXT(rdataset, link))
+ {
+ if (rdataset->type == dns_rdatatype_rrsig &&
+ rdataset->covers == tneg->type)
+ {
+ tnegsig = rdataset;
+ }
+ }
+ if (tnegsig == NULL) {
+ return (ISC_R_NOTFOUND);
+ }
+
+ dns_name_clone(closest, name);
+ dns_rdataset_clone(tneg, neg);
+ dns_rdataset_clone(tnegsig, negsig);
+ return (ISC_R_SUCCESS);
+}
+
+void
+isc__rdatalist_setownercase(dns_rdataset_t *rdataset, const dns_name_t *name) {
+ dns_rdatalist_t *rdatalist;
+ unsigned int i;
+
+ /*
+ * We do not need to worry about label lengths as they are all
+ * less than or equal to 63.
+ */
+ rdatalist = rdataset->private1;
+ memset(rdatalist->upper, 0, sizeof(rdatalist->upper));
+ for (i = 1; i < name->length; i++) {
+ if (name->ndata[i] >= 0x41 && name->ndata[i] <= 0x5a) {
+ rdatalist->upper[i / 8] |= 1 << (i % 8);
+ /*
+ * Record that upper has been set.
+ */
+ }
+ }
+ /*
+ * Record that upper has been set.
+ */
+ rdatalist->upper[0] |= 0x01;
+}
+
+void
+isc__rdatalist_getownercase(const dns_rdataset_t *rdataset, dns_name_t *name) {
+ dns_rdatalist_t *rdatalist;
+ unsigned int i;
+
+ rdatalist = rdataset->private1;
+ if ((rdatalist->upper[0] & 0x01) == 0) {
+ return;
+ }
+ for (i = 0; i < name->length; i++) {
+ /*
+ * Set the case bit if it does not match the recorded bit.
+ */
+ if (name->ndata[i] >= 0x61 && name->ndata[i] <= 0x7a &&
+ (rdatalist->upper[i / 8] & (1 << (i % 8))) != 0)
+ {
+ name->ndata[i] &= ~0x20; /* clear the lower case bit */
+ } else if (name->ndata[i] >= 0x41 && name->ndata[i] <= 0x5a &&
+ (rdatalist->upper[i / 8] & (1 << (i % 8))) == 0)
+ {
+ name->ndata[i] |= 0x20; /* set the lower case bit */
+ }
+ }
+}
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