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/*
* Copyright (C) Internet Systems Consortium, Inc. ("ISC")
*
* 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 http://mozilla.org/MPL/2.0/.
*
* See the COPYRIGHT file distributed with this work for additional
* information regarding copyright ownership.
*/
/* $Id: order.c,v 1.10 2007/06/19 23:47:16 tbox Exp $ */
/*! \file */
#include <config.h>
#include <stdbool.h>
#include <isc/magic.h>
#include <isc/mem.h>
#include <isc/types.h>
#include <isc/util.h>
#include <isc/refcount.h>
#include <dns/fixedname.h>
#include <dns/name.h>
#include <dns/order.h>
#include <dns/rdataset.h>
#include <dns/types.h>
typedef struct dns_order_ent dns_order_ent_t;
struct dns_order_ent {
dns_fixedname_t name;
dns_rdataclass_t rdclass;
dns_rdatatype_t rdtype;
unsigned int mode;
ISC_LINK(dns_order_ent_t) link;
};
struct dns_order {
unsigned int magic;
isc_refcount_t references;
ISC_LIST(dns_order_ent_t) ents;
isc_mem_t *mctx;
};
#define DNS_ORDER_MAGIC ISC_MAGIC('O','r','d','r')
#define DNS_ORDER_VALID(order) ISC_MAGIC_VALID(order, DNS_ORDER_MAGIC)
isc_result_t
dns_order_create(isc_mem_t *mctx, dns_order_t **orderp) {
dns_order_t *order;
isc_result_t result;
REQUIRE(orderp != NULL && *orderp == NULL);
order = isc_mem_get(mctx, sizeof(*order));
if (order == NULL)
return (ISC_R_NOMEMORY);
ISC_LIST_INIT(order->ents);
/* Implicit attach. */
result = isc_refcount_init(&order->references, 1);
if (result != ISC_R_SUCCESS) {
isc_mem_put(mctx, order, sizeof(*order));
return (result);
}
order->mctx = NULL;
isc_mem_attach(mctx, &order->mctx);
order->magic = DNS_ORDER_MAGIC;
*orderp = order;
return (ISC_R_SUCCESS);
}
isc_result_t
dns_order_add(dns_order_t *order, dns_name_t *name,
dns_rdatatype_t rdtype, dns_rdataclass_t rdclass,
unsigned int mode)
{
dns_order_ent_t *ent;
REQUIRE(DNS_ORDER_VALID(order));
REQUIRE(mode == DNS_RDATASETATTR_RANDOMIZE ||
mode == DNS_RDATASETATTR_FIXEDORDER ||
mode == 0 /* DNS_RDATASETATTR_CYCLIC */ );
ent = isc_mem_get(order->mctx, sizeof(*ent));
if (ent == NULL)
return (ISC_R_NOMEMORY);
dns_fixedname_init(&ent->name);
RUNTIME_CHECK(dns_name_copy(name, dns_fixedname_name(&ent->name), NULL)
== ISC_R_SUCCESS);
ent->rdtype = rdtype;
ent->rdclass = rdclass;
ent->mode = mode;
ISC_LINK_INIT(ent, link);
ISC_LIST_INITANDAPPEND(order->ents, ent, link);
return (ISC_R_SUCCESS);
}
static inline bool
match(dns_name_t *name1, dns_name_t *name2) {
if (dns_name_iswildcard(name2))
return(dns_name_matcheswildcard(name1, name2));
return (dns_name_equal(name1, name2));
}
unsigned int
dns_order_find(dns_order_t *order, dns_name_t *name,
dns_rdatatype_t rdtype, dns_rdataclass_t rdclass)
{
dns_order_ent_t *ent;
REQUIRE(DNS_ORDER_VALID(order));
for (ent = ISC_LIST_HEAD(order->ents);
ent != NULL;
ent = ISC_LIST_NEXT(ent, link)) {
if (ent->rdtype != rdtype && ent->rdtype != dns_rdatatype_any)
continue;
if (ent->rdclass != rdclass &&
ent->rdclass != dns_rdataclass_any)
continue;
if (match(name, dns_fixedname_name(&ent->name)))
return (ent->mode);
}
return (DNS_RDATASETATTR_RANDOMIZE);
}
void
dns_order_attach(dns_order_t *source, dns_order_t **target) {
REQUIRE(DNS_ORDER_VALID(source));
REQUIRE(target != NULL && *target == NULL);
isc_refcount_increment(&source->references, NULL);
*target = source;
}
void
dns_order_detach(dns_order_t **orderp) {
dns_order_t *order;
dns_order_ent_t *ent;
unsigned int references;
REQUIRE(orderp != NULL);
order = *orderp;
REQUIRE(DNS_ORDER_VALID(order));
isc_refcount_decrement(&order->references, &references);
*orderp = NULL;
if (references != 0)
return;
order->magic = 0;
while ((ent = ISC_LIST_HEAD(order->ents)) != NULL) {
ISC_LIST_UNLINK(order->ents, ent, link);
isc_mem_put(order->mctx, ent, sizeof(*ent));
}
isc_refcount_destroy(&order->references);
isc_mem_putanddetach(&order->mctx, order, sizeof(*order));
}
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