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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: rriterator.h,v 1.4 2011/11/01 23:47:00 tbox Exp $ / #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 <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, isc_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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