Current File : //usr/include/bind9/dns/rriterator.h
/*
* 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 https://mozilla.org/MPL/2.0/.
*
* See the COPYRIGHT file distributed with this work for additional
* information regarding copyright ownership.
*/
#ifndef DNS_RRITERATOR_H
#define DNS_RRITERATOR_H 1
/*****
***** Module Info
*****/
/*! \file dns/rriterator.h
* \brief
* Functions for "walking" a zone database, visiting each RR or RRset in turn.
*/
/*****
***** Imports
*****/
#include <inttypes.h>
#include <isc/lang.h>
#include <isc/magic.h>
#include <isc/ondestroy.h>
#include <isc/stdtime.h>
#include <dns/db.h>
#include <dns/dbiterator.h>
#include <dns/fixedname.h>
#include <dns/name.h>
#include <dns/rdata.h>
#include <dns/rdataset.h>
#include <dns/rdatasetiter.h>
#include <dns/types.h>
ISC_LANG_BEGINDECLS
/*****
***** Types
*****/
/*%
* A dns_rriterator_t is an iterator that iterates over an entire database,
* returning one RR at a time, in some arbitrary order.
*/
typedef struct dns_rriterator {
unsigned int magic;
isc_result_t result;
dns_db_t *db;
dns_dbiterator_t *dbit;
dns_dbversion_t *ver;
isc_stdtime_t now;
dns_dbnode_t *node;
dns_fixedname_t fixedname;
dns_rdatasetiter_t *rdatasetit;
dns_rdataset_t rdataset;
dns_rdata_t rdata;
} dns_rriterator_t;
#define RRITERATOR_MAGIC ISC_MAGIC('R', 'R', 'I', 't')
#define VALID_RRITERATOR(m) ISC_MAGIC_VALID(m, RRITERATOR_MAGIC)
isc_result_t
dns_rriterator_init(dns_rriterator_t *it, dns_db_t *db,
dns_dbversion_t *ver, isc_stdtime_t now);
/*%
* Initialize an rriterator; sets the cursor to the origin node
* of the database.
*
* Requires:
*
* \li 'db' is a valid database.
*
* Returns:
*
* \li #ISC_R_SUCCESS
* \li #ISC_R_NOMEMORY
*/
isc_result_t
dns_rriterator_first(dns_rriterator_t *it);
/*%<
* Move the rriterator cursor to the first rdata in the database.
*
* Requires:
*\li 'it' is a valid, initialized rriterator
*
* Returns:
*\li #ISC_R_SUCCESS
*\li #ISC_R_NOMORE There are no rdata in the set.
*/
isc_result_t
dns_rriterator_nextrrset(dns_rriterator_t *it);
/*%<
* Move the rriterator cursor to the next rrset in the database,
* skipping over any remaining records that have the same rdatatype
* as the current one.
*
* Requires:
*\li 'it' is a valid, initialized rriterator
*
* Returns:
*\li #ISC_R_SUCCESS
*\li #ISC_R_NOMORE No more rrsets in the database
*/
isc_result_t
dns_rriterator_next(dns_rriterator_t *it);
/*%<
* Move the rriterator cursor to the next rrset in the database,
* skipping over any remaining records that have the same rdatatype
* as the current one.
*
* Requires:
*\li 'it' is a valid, initialized rriterator
*
* Returns:
*\li #ISC_R_SUCCESS
*\li #ISC_R_NOMORE No more records in the database
*/
void
dns_rriterator_current(dns_rriterator_t *it, dns_name_t **name,
uint32_t *ttl, dns_rdataset_t **rdataset,
dns_rdata_t **rdata);
/*%<
* Make '*name' refer to the current name. If 'rdataset' is not NULL,
* make '*rdataset' refer to the current * rdataset. If '*rdata' is not
* NULL, make '*rdata' refer to the current record.
*
* Requires:
*\li '*name' is a valid name object
*\li 'rdataset' is NULL or '*rdataset' is NULL
*\li 'rdata' is NULL or '*rdata' is NULL
*
* Ensures:
*\li 'rdata' refers to the rdata at the rdata cursor location of
*\li 'rdataset'.
*/
void
dns_rriterator_pause(dns_rriterator_t *it);
/*%<
* Pause rriterator. Frees any locks held by the database iterator.
* Callers should use this routine any time they are not going to
* execute another rriterator method in the immediate future.
*
* Requires:
*\li 'it' is a valid iterator.
*
* Ensures:
*\li Any database locks being held for efficiency of iterator access are
* released.
*/
void
dns_rriterator_destroy(dns_rriterator_t *it);
/*%<
* Shut down and free resources in rriterator 'it'.
*
* Requires:
*
*\li 'it' is a valid iterator.
*
* Ensures:
*
*\li All resources used by the rriterator are freed.
*/
ISC_LANG_ENDDECLS
#endif /* DNS_RRITERATOR_H */
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