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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 */
/***
*** Imports
***/
#include <inttypes.h>
#include <isc/result.h>
#include <isc/string.h>
#include <isc/util.h>
#include <dns/db.h>
#include <dns/dbiterator.h>
#include <dns/rdata.h>
#include <dns/rdataset.h>
#include <dns/rdatasetiter.h>
#include <dns/rriterator.h>
/***
*** RRiterator methods
***/
isc_result_t
dns_rriterator_init(dns_rriterator_t *it, dns_db_t *db, dns_dbversion_t *ver,
isc_stdtime_t now) {
isc_result_t result;
it->magic = RRITERATOR_MAGIC;
it->db = db;
it->dbit = NULL;
it->ver = ver;
it->now = now;
it->node = NULL;
result = dns_db_createiterator(it->db, 0, &it->dbit);
if (result != ISC_R_SUCCESS) {
return (result);
}
it->rdatasetit = NULL;
dns_rdata_init(&it->rdata);
dns_rdataset_init(&it->rdataset);
dns_fixedname_init(&it->fixedname);
INSIST(!dns_rdataset_isassociated(&it->rdataset));
it->result = ISC_R_SUCCESS;
return (it->result);
}
isc_result_t
dns_rriterator_first(dns_rriterator_t *it) {
REQUIRE(VALID_RRITERATOR(it));
/* Reset state */
if (dns_rdataset_isassociated(&it->rdataset)) {
dns_rdataset_disassociate(&it->rdataset);
}
if (it->rdatasetit != NULL) {
dns_rdatasetiter_destroy(&it->rdatasetit);
}
if (it->node != NULL) {
dns_db_detachnode(it->db, &it->node);
}
it->result = dns_dbiterator_first(it->dbit);
/*
* The top node may be empty when out of zone glue exists.
* Walk the tree to find the first node with data.
*/
while (it->result == ISC_R_SUCCESS) {
it->result = dns_dbiterator_current(
it->dbit, &it->node,
dns_fixedname_name(&it->fixedname));
if (it->result != ISC_R_SUCCESS) {
return (it->result);
}
it->result = dns_db_allrdatasets(it->db, it->node, it->ver, 0,
it->now, &it->rdatasetit);
if (it->result != ISC_R_SUCCESS) {
return (it->result);
}
it->result = dns_rdatasetiter_first(it->rdatasetit);
if (it->result != ISC_R_SUCCESS) {
/*
* This node is empty. Try next node.
*/
dns_rdatasetiter_destroy(&it->rdatasetit);
dns_db_detachnode(it->db, &it->node);
it->result = dns_dbiterator_next(it->dbit);
continue;
}
dns_rdatasetiter_current(it->rdatasetit, &it->rdataset);
dns_rdataset_getownercase(&it->rdataset,
dns_fixedname_name(&it->fixedname));
it->rdataset.attributes |= DNS_RDATASETATTR_LOADORDER;
it->result = dns_rdataset_first(&it->rdataset);
return (it->result);
}
return (it->result);
}
isc_result_t
dns_rriterator_nextrrset(dns_rriterator_t *it) {
REQUIRE(VALID_RRITERATOR(it));
if (dns_rdataset_isassociated(&it->rdataset)) {
dns_rdataset_disassociate(&it->rdataset);
}
it->result = dns_rdatasetiter_next(it->rdatasetit);
/*
* The while loop body is executed more than once
* only when an empty dbnode needs to be skipped.
*/
while (it->result == ISC_R_NOMORE) {
dns_rdatasetiter_destroy(&it->rdatasetit);
dns_db_detachnode(it->db, &it->node);
it->result = dns_dbiterator_next(it->dbit);
if (it->result == ISC_R_NOMORE) {
/* We are at the end of the entire database. */
return (it->result);
}
if (it->result != ISC_R_SUCCESS) {
return (it->result);
}
it->result = dns_dbiterator_current(
it->dbit, &it->node,
dns_fixedname_name(&it->fixedname));
if (it->result != ISC_R_SUCCESS) {
return (it->result);
}
it->result = dns_db_allrdatasets(it->db, it->node, it->ver, 0,
it->now, &it->rdatasetit);
if (it->result != ISC_R_SUCCESS) {
return (it->result);
}
it->result = dns_rdatasetiter_first(it->rdatasetit);
}
if (it->result != ISC_R_SUCCESS) {
return (it->result);
}
dns_rdatasetiter_current(it->rdatasetit, &it->rdataset);
dns_rdataset_getownercase(&it->rdataset,
dns_fixedname_name(&it->fixedname));
it->rdataset.attributes |= DNS_RDATASETATTR_LOADORDER;
it->result = dns_rdataset_first(&it->rdataset);
return (it->result);
}
isc_result_t
dns_rriterator_next(dns_rriterator_t *it) {
REQUIRE(VALID_RRITERATOR(it));
if (it->result != ISC_R_SUCCESS) {
return (it->result);
}
INSIST(it->dbit != NULL);
INSIST(it->node != NULL);
INSIST(it->rdatasetit != NULL);
it->result = dns_rdataset_next(&it->rdataset);
if (it->result == ISC_R_NOMORE) {
return (dns_rriterator_nextrrset(it));
}
return (it->result);
}
void
dns_rriterator_pause(dns_rriterator_t *it) {
REQUIRE(VALID_RRITERATOR(it));
RUNTIME_CHECK(dns_dbiterator_pause(it->dbit) == ISC_R_SUCCESS);
}
void
dns_rriterator_destroy(dns_rriterator_t *it) {
REQUIRE(VALID_RRITERATOR(it));
if (dns_rdataset_isassociated(&it->rdataset)) {
dns_rdataset_disassociate(&it->rdataset);
}
if (it->rdatasetit != NULL) {
dns_rdatasetiter_destroy(&it->rdatasetit);
}
if (it->node != NULL) {
dns_db_detachnode(it->db, &it->node);
}
dns_dbiterator_destroy(&it->dbit);
}
void
dns_rriterator_current(dns_rriterator_t *it, dns_name_t **name, uint32_t *ttl,
dns_rdataset_t **rdataset, dns_rdata_t **rdata) {
REQUIRE(name != NULL && *name == NULL);
REQUIRE(VALID_RRITERATOR(it));
REQUIRE(it->result == ISC_R_SUCCESS);
REQUIRE(rdataset == NULL || *rdataset == NULL);
REQUIRE(rdata == NULL || *rdata == NULL);
*name = dns_fixedname_name(&it->fixedname);
*ttl = it->rdataset.ttl;
dns_rdata_reset(&it->rdata);
dns_rdataset_current(&it->rdataset, &it->rdata);
if (rdataset != NULL) {
*rdataset = &it->rdataset;
}
if (rdata != NULL) {
*rdata = &it->rdata;
}
}
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