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https://gitlab.isc.org/isc-projects/bind9
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750d8a61b6
RRset ordering is now an enum inside struct rdataset attributes. This was done to keep size to of the structure to its original value before this MR. I expect zero performance impact but it should be easier to deal with attributes in debuggers and language servers.
414 lines
8.8 KiB
C
414 lines
8.8 KiB
C
/*
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* Copyright (C) Internet Systems Consortium, Inc. ("ISC")
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*
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* SPDX-License-Identifier: MPL-2.0
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*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, you can obtain one at https://mozilla.org/MPL/2.0/.
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*
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* See the COPYRIGHT file distributed with this work for additional
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* information regarding copyright ownership.
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*/
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/*! \file */
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#include <stddef.h>
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#include <string.h>
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#include <isc/util.h>
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#include <dns/name.h>
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#include <dns/nsec3.h>
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#include <dns/rdata.h>
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#include <dns/rdatalist.h>
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#include <dns/rdataset.h>
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static dns_rdatasetmethods_t methods = {
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.disassociate = dns_rdatalist_disassociate,
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.first = dns_rdatalist_first,
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.next = dns_rdatalist_next,
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.current = dns_rdatalist_current,
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.clone = dns_rdatalist_clone,
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.count = dns_rdatalist_count,
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.addnoqname = dns_rdatalist_addnoqname,
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.getnoqname = dns_rdatalist_getnoqname,
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.addclosest = dns_rdatalist_addclosest,
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.getclosest = dns_rdatalist_getclosest,
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.setownercase = dns_rdatalist_setownercase,
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.getownercase = dns_rdatalist_getownercase,
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};
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void
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dns_rdatalist_init(dns_rdatalist_t *rdatalist) {
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REQUIRE(rdatalist != NULL);
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/*
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* Initialize rdatalist.
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*/
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*rdatalist = (dns_rdatalist_t){
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.rdata = ISC_LIST_INITIALIZER,
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.link = ISC_LINK_INITIALIZER,
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};
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memset(rdatalist->upper, 0xeb, sizeof(rdatalist->upper));
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/*
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* Clear upper set bit.
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*/
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rdatalist->upper[0] &= ~0x01;
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}
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void
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dns_rdatalist_tordataset(dns_rdatalist_t *rdatalist, dns_rdataset_t *rdataset) {
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/*
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* Make 'rdataset' refer to the rdata in 'rdatalist'.
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*/
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REQUIRE(rdatalist != NULL);
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REQUIRE(DNS_RDATASET_VALID(rdataset));
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REQUIRE(!dns_rdataset_isassociated(rdataset));
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/* Check if dns_rdatalist_init has was called. */
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REQUIRE(rdatalist->upper[0] == 0xea);
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*rdataset = (dns_rdataset_t){
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.methods = &methods,
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.rdclass = rdatalist->rdclass,
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.type = rdatalist->type,
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.covers = rdatalist->covers,
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.ttl = rdatalist->ttl,
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.rdlist.list = rdatalist,
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.link = rdataset->link,
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.count = rdataset->count,
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.attributes = rdataset->attributes,
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.magic = rdataset->magic,
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};
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}
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void
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dns_rdatalist_fromrdataset(dns_rdataset_t *rdataset,
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dns_rdatalist_t **rdatalist) {
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REQUIRE(rdatalist != NULL && rdataset != NULL);
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REQUIRE(rdataset->methods == &methods);
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*rdatalist = rdataset->rdlist.list;
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}
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void
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dns_rdatalist_disassociate(dns_rdataset_t *rdataset DNS__DB_FLARG) {
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UNUSED(rdataset);
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}
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isc_result_t
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dns_rdatalist_first(dns_rdataset_t *rdataset) {
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dns_rdatalist_t *rdatalist = NULL;
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rdatalist = rdataset->rdlist.list;
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rdataset->rdlist.iter = ISC_LIST_HEAD(rdatalist->rdata);
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if (rdataset->rdlist.iter == NULL) {
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return ISC_R_NOMORE;
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}
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return ISC_R_SUCCESS;
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}
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isc_result_t
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dns_rdatalist_next(dns_rdataset_t *rdataset) {
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dns_rdata_t *rdata;
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rdata = rdataset->rdlist.iter;
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if (rdata == NULL) {
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return ISC_R_NOMORE;
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}
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rdataset->rdlist.iter = ISC_LIST_NEXT(rdata, link);
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if (rdataset->rdlist.iter == NULL) {
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return ISC_R_NOMORE;
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}
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return ISC_R_SUCCESS;
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}
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void
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dns_rdatalist_current(dns_rdataset_t *rdataset, dns_rdata_t *rdata) {
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dns_rdata_t *list_rdata;
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list_rdata = rdataset->rdlist.iter;
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INSIST(list_rdata != NULL);
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dns_rdata_clone(list_rdata, rdata);
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}
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void
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dns_rdatalist_clone(dns_rdataset_t *source,
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dns_rdataset_t *target DNS__DB_FLARG) {
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REQUIRE(source != NULL);
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REQUIRE(target != NULL);
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*target = *source;
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target->rdlist.iter = NULL;
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}
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unsigned int
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dns_rdatalist_count(dns_rdataset_t *rdataset) {
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dns_rdatalist_t *rdatalist = NULL;
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unsigned int count;
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REQUIRE(rdataset != NULL);
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rdatalist = rdataset->rdlist.list;
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count = 0;
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ISC_LIST_FOREACH (rdatalist->rdata, rdata, link) {
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count++;
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}
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return count;
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}
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isc_result_t
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dns_rdatalist_addnoqname(dns_rdataset_t *rdataset, dns_name_t *name) {
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dns_rdataset_t *neg = NULL;
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dns_rdataset_t *negsig = NULL;
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dns_ttl_t ttl;
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REQUIRE(rdataset != NULL);
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ISC_LIST_FOREACH (name->list, rdset, link) {
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if (rdset->rdclass != rdataset->rdclass) {
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continue;
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}
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if (rdset->type == dns_rdatatype_nsec ||
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rdset->type == dns_rdatatype_nsec3)
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{
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neg = rdset;
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}
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}
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if (neg == NULL) {
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return ISC_R_NOTFOUND;
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}
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ISC_LIST_FOREACH (name->list, rdset, link) {
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if (rdset->type == dns_rdatatype_rrsig &&
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rdset->covers == neg->type)
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{
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negsig = rdset;
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}
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}
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if (negsig == NULL) {
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return ISC_R_NOTFOUND;
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}
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/*
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* Minimise ttl.
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*/
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ttl = rdataset->ttl;
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if (neg->ttl < ttl) {
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ttl = neg->ttl;
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}
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if (negsig->ttl < ttl) {
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ttl = negsig->ttl;
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}
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rdataset->ttl = neg->ttl = negsig->ttl = ttl;
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rdataset->attributes.noqname = true;
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rdataset->rdlist.noqname = name;
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return ISC_R_SUCCESS;
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}
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isc_result_t
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dns_rdatalist_getnoqname(dns_rdataset_t *rdataset, dns_name_t *name,
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dns_rdataset_t *neg,
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dns_rdataset_t *negsig DNS__DB_FLARG) {
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dns_rdataclass_t rdclass;
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dns_rdataset_t *tneg = NULL;
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dns_rdataset_t *tnegsig = NULL;
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dns_name_t *noqname = NULL;
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REQUIRE(rdataset != NULL);
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REQUIRE(rdataset->attributes.noqname);
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rdclass = rdataset->rdclass;
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noqname = rdataset->rdlist.noqname;
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(void)dns_name_dynamic(noqname); /* Sanity Check. */
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ISC_LIST_FOREACH (noqname->list, rdset, link) {
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if (rdset->rdclass != rdclass) {
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continue;
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}
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if (rdset->type == dns_rdatatype_nsec ||
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rdset->type == dns_rdatatype_nsec3)
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{
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tneg = rdset;
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}
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}
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if (tneg == NULL) {
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return ISC_R_NOTFOUND;
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}
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ISC_LIST_FOREACH (noqname->list, rdset, link) {
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if (rdset->type == dns_rdatatype_rrsig &&
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rdset->covers == tneg->type)
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{
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tnegsig = rdset;
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}
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}
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if (tnegsig == NULL) {
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return ISC_R_NOTFOUND;
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}
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dns_name_clone(noqname, name);
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dns_rdataset_clone(tneg, neg);
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dns_rdataset_clone(tnegsig, negsig);
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return ISC_R_SUCCESS;
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}
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isc_result_t
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dns_rdatalist_addclosest(dns_rdataset_t *rdataset, dns_name_t *name) {
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dns_rdataset_t *neg = NULL;
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dns_rdataset_t *negsig = NULL;
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dns_ttl_t ttl;
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REQUIRE(rdataset != NULL);
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ISC_LIST_FOREACH (name->list, rdset, link) {
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if (rdset->rdclass != rdataset->rdclass) {
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continue;
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}
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if (rdset->type == dns_rdatatype_nsec ||
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rdset->type == dns_rdatatype_nsec3)
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{
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neg = rdset;
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}
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}
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if (neg == NULL) {
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return ISC_R_NOTFOUND;
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}
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ISC_LIST_FOREACH (name->list, rdset, link) {
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if (rdset->type == dns_rdatatype_rrsig &&
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rdset->covers == neg->type)
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{
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negsig = rdset;
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}
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}
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if (negsig == NULL) {
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return ISC_R_NOTFOUND;
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}
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/*
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* Minimise ttl.
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*/
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ttl = rdataset->ttl;
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if (neg->ttl < ttl) {
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ttl = neg->ttl;
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}
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if (negsig->ttl < ttl) {
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ttl = negsig->ttl;
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}
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rdataset->ttl = neg->ttl = negsig->ttl = ttl;
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rdataset->attributes.closest = true;
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rdataset->rdlist.closest = name;
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return ISC_R_SUCCESS;
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}
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isc_result_t
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dns_rdatalist_getclosest(dns_rdataset_t *rdataset, dns_name_t *name,
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dns_rdataset_t *neg,
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dns_rdataset_t *negsig DNS__DB_FLARG) {
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dns_rdataclass_t rdclass;
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dns_rdataset_t *tneg = NULL;
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dns_rdataset_t *tnegsig = NULL;
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dns_name_t *closest = NULL;
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REQUIRE(rdataset != NULL);
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REQUIRE(rdataset->attributes.closest);
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rdclass = rdataset->rdclass;
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closest = rdataset->rdlist.closest;
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(void)dns_name_dynamic(closest); /* Sanity Check. */
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ISC_LIST_FOREACH (closest->list, rdset, link) {
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if (rdset->rdclass != rdclass) {
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continue;
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}
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if (rdset->type == dns_rdatatype_nsec ||
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rdset->type == dns_rdatatype_nsec3)
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{
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tneg = rdset;
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}
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}
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if (tneg == NULL) {
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return ISC_R_NOTFOUND;
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}
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ISC_LIST_FOREACH (closest->list, rdset, link) {
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if (rdset->type == dns_rdatatype_rrsig &&
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rdset->covers == tneg->type)
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{
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tnegsig = rdset;
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}
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}
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if (tnegsig == NULL) {
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return ISC_R_NOTFOUND;
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}
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dns_name_clone(closest, name);
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dns_rdataset_clone(tneg, neg);
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dns_rdataset_clone(tnegsig, negsig);
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return ISC_R_SUCCESS;
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}
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void
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dns_rdatalist_setownercase(dns_rdataset_t *rdataset, const dns_name_t *name) {
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dns_rdatalist_t *rdatalist;
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unsigned int i;
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/*
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* We do not need to worry about label lengths as they are all
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* less than or equal to 63.
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*/
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rdatalist = rdataset->rdlist.list;
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memset(rdatalist->upper, 0, sizeof(rdatalist->upper));
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for (i = 1; i < name->length; i++) {
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if (name->ndata[i] >= 0x41 && name->ndata[i] <= 0x5a) {
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rdatalist->upper[i / 8] |= 1 << (i % 8);
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}
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}
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/*
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* Record that upper has been set.
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*/
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rdatalist->upper[0] |= 0x01;
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}
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void
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dns_rdatalist_getownercase(const dns_rdataset_t *rdataset, dns_name_t *name) {
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dns_rdatalist_t *rdatalist;
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unsigned int i;
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rdatalist = rdataset->rdlist.list;
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if ((rdatalist->upper[0] & 0x01) == 0) {
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return;
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}
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for (i = 0; i < name->length; i++) {
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/*
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* Set the case bit if it does not match the recorded bit.
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*/
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if (name->ndata[i] >= 0x61 && name->ndata[i] <= 0x7a &&
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(rdatalist->upper[i / 8] & (1 << (i % 8))) != 0)
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{
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name->ndata[i] &= ~0x20; /* clear the lower case bit */
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} else if (name->ndata[i] >= 0x41 && name->ndata[i] <= 0x5a &&
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(rdatalist->upper[i / 8] & (1 << (i % 8))) == 0)
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{
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name->ndata[i] |= 0x20; /* set the lower case bit */
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}
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}
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}
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