mirror of
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.
141 lines
3.4 KiB
C
141 lines
3.4 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 <stdbool.h>
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#include <isc/magic.h>
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#include <isc/mem.h>
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#include <isc/refcount.h>
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#include <isc/types.h>
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#include <isc/util.h>
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#include <dns/fixedname.h>
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#include <dns/name.h>
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#include <dns/order.h>
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#include <dns/rdataset.h>
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#include <dns/types.h>
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typedef struct dns_order_ent dns_order_ent_t;
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struct dns_order_ent {
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dns_fixedname_t name;
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dns_rdataclass_t rdclass;
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dns_rdatatype_t rdtype;
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dns_orderopt_t mode;
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ISC_LINK(dns_order_ent_t) link;
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};
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struct dns_order {
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unsigned int magic;
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isc_refcount_t references;
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ISC_LIST(dns_order_ent_t) ents;
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isc_mem_t *mctx;
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};
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#define DNS_ORDER_MAGIC ISC_MAGIC('O', 'r', 'd', 'r')
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#define DNS_ORDER_VALID(order) ISC_MAGIC_VALID(order, DNS_ORDER_MAGIC)
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void
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dns_order_create(isc_mem_t *mctx, dns_order_t **orderp) {
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dns_order_t *order = NULL;
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REQUIRE(orderp != NULL && *orderp == NULL);
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order = isc_mem_get(mctx, sizeof(*order));
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*order = (dns_order_t){
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.ents = ISC_LIST_INITIALIZER,
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.references = ISC_REFCOUNT_INITIALIZER(1),
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.magic = DNS_ORDER_MAGIC,
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};
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isc_mem_attach(mctx, &order->mctx);
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*orderp = order;
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}
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void
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dns_order_add(dns_order_t *order, const dns_name_t *name,
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dns_rdatatype_t rdtype, dns_rdataclass_t rdclass,
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dns_orderopt_t mode) {
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dns_order_ent_t *ent = NULL;
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REQUIRE(DNS_ORDER_VALID(order));
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ent = isc_mem_get(order->mctx, sizeof(*ent));
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*ent = (dns_order_ent_t){
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.rdtype = rdtype,
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.rdclass = rdclass,
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.mode = mode,
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.link = ISC_LINK_INITIALIZER,
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};
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dns_fixedname_init(&ent->name);
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dns_name_copy(name, dns_fixedname_name(&ent->name));
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ISC_LIST_INITANDAPPEND(order->ents, ent, link);
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}
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static bool
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match(const dns_name_t *name1, const dns_name_t *name2) {
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if (dns_name_iswildcard(name2)) {
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return dns_name_matcheswildcard(name1, name2);
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}
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return dns_name_equal(name1, name2);
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}
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dns_orderopt_t
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dns_order_find(dns_order_t *order, const dns_name_t *name,
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dns_rdatatype_t rdtype, dns_rdataclass_t rdclass) {
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REQUIRE(DNS_ORDER_VALID(order));
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ISC_LIST_FOREACH (order->ents, ent, link) {
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if (ent->rdtype != rdtype && ent->rdtype != dns_rdatatype_any) {
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continue;
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}
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if (ent->rdclass != rdclass &&
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ent->rdclass != dns_rdataclass_any)
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{
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continue;
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}
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if (match(name, dns_fixedname_name(&ent->name))) {
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return ent->mode;
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}
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}
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return dns_order_none;
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}
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void
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dns_order_attach(dns_order_t *source, dns_order_t **target) {
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REQUIRE(DNS_ORDER_VALID(source));
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REQUIRE(target != NULL && *target == NULL);
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isc_refcount_increment(&source->references);
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*target = source;
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}
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void
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dns_order_detach(dns_order_t **orderp) {
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REQUIRE(orderp != NULL && DNS_ORDER_VALID(*orderp));
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dns_order_t *order = *orderp;
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*orderp = NULL;
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if (isc_refcount_decrement(&order->references) == 1) {
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isc_refcount_destroy(&order->references);
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order->magic = 0;
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ISC_LIST_FOREACH (order->ents, ent, link) {
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ISC_LIST_UNLINK(order->ents, ent, link);
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isc_mem_put(order->mctx, ent, sizeof(*ent));
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}
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isc_mem_putanddetach(&order->mctx, order, sizeof(*order));
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}
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}
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