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rriterator.h
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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 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 */