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Edit File: db.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_DB_H #define DNS_DB_H 1 /***** ***** Module Info *****/ /*! \file dns/db.h * \brief * The DNS DB interface allows named rdatasets to be stored and retrieved. * * The dns_db_t type is like a "virtual class". To actually use * DBs, an implementation of the class is required. * * XXX more XXX * * MP: * \li The module ensures appropriate synchronization of data structures it * creates and manipulates. * * Reliability: * \li No anticipated impact. * * Resources: * \li TBS * * Security: * \li No anticipated impact. * * Standards: * \li None. */ /***** ***** Imports *****/ #include <inttypes.h> #include <stdbool.h> #include <isc/deprecated.h> #include <isc/lang.h> #include <isc/magic.h> #include <isc/stats.h> #include <isc/stdtime.h> #include <dns/clientinfo.h> #include <dns/fixedname.h> #include <dns/name.h> #include <dns/rdata.h> #include <dns/rdataset.h> #include <dns/types.h> ISC_LANG_BEGINDECLS /***** ***** Types *****/ typedef struct dns_dbmethods { void (*attach)(dns_db_t *source, dns_db_t **targetp); void (*detach)(dns_db_t **dbp); isc_result_t (*beginload)(dns_db_t *db, dns_rdatacallbacks_t *callbacks); isc_result_t (*endload)(dns_db_t *db, dns_rdatacallbacks_t *callbacks); isc_result_t (*serialize)(dns_db_t *db, dns_dbversion_t *version, FILE *file); isc_result_t (*dump)(dns_db_t *db, dns_dbversion_t *version, const char *filename, dns_masterformat_t masterformat); void (*currentversion)(dns_db_t *db, dns_dbversion_t **versionp); isc_result_t (*newversion)(dns_db_t *db, dns_dbversion_t **versionp); void (*attachversion)(dns_db_t *db, dns_dbversion_t *source, dns_dbversion_t **targetp); void (*closeversion)(dns_db_t *db, dns_dbversion_t **versionp, bool commit); isc_result_t (*findnode)(dns_db_t *db, const dns_name_t *name, bool create, dns_dbnode_t **nodep); isc_result_t (*find)(dns_db_t *db, const dns_name_t *name, dns_dbversion_t *version, dns_rdatatype_t type, unsigned int options, isc_stdtime_t now, dns_dbnode_t **nodep, dns_name_t *foundname, dns_rdataset_t *rdataset, dns_rdataset_t *sigrdataset); isc_result_t (*findzonecut)(dns_db_t *db, const dns_name_t *name, unsigned int options, isc_stdtime_t now, dns_dbnode_t **nodep, dns_name_t *foundname, dns_name_t *dcname, dns_rdataset_t *rdataset, dns_rdataset_t *sigrdataset); void (*attachnode)(dns_db_t *db, dns_dbnode_t *source, dns_dbnode_t **targetp); void (*detachnode)(dns_db_t *db, dns_dbnode_t **targetp); isc_result_t (*expirenode)(dns_db_t *db, dns_dbnode_t *node, isc_stdtime_t now); void (*printnode)(dns_db_t *db, dns_dbnode_t *node, FILE *out); isc_result_t (*createiterator)(dns_db_t *db, unsigned int options, dns_dbiterator_t **iteratorp); isc_result_t (*findrdataset)(dns_db_t *db, dns_dbnode_t *node, dns_dbversion_t *version, dns_rdatatype_t type, dns_rdatatype_t covers, isc_stdtime_t now, dns_rdataset_t *rdataset, dns_rdataset_t *sigrdataset); isc_result_t (*allrdatasets)(dns_db_t *db, dns_dbnode_t *node, dns_dbversion_t *version, isc_stdtime_t now, dns_rdatasetiter_t **iteratorp); isc_result_t (*addrdataset)(dns_db_t *db, dns_dbnode_t *node, dns_dbversion_t *version, isc_stdtime_t now, dns_rdataset_t *rdataset, unsigned int options, dns_rdataset_t *addedrdataset); isc_result_t (*subtractrdataset)(dns_db_t *db, dns_dbnode_t *node, dns_dbversion_t *version, dns_rdataset_t *rdataset, unsigned int options, dns_rdataset_t *newrdataset); isc_result_t (*deleterdataset)(dns_db_t *db, dns_dbnode_t *node, dns_dbversion_t *version, dns_rdatatype_t type, dns_rdatatype_t covers); bool (*issecure)(dns_db_t *db); unsigned int (*nodecount)(dns_db_t *db); bool (*ispersistent)(dns_db_t *db); void (*overmem)(dns_db_t *db, bool overmem); void (*settask)(dns_db_t *db, isc_task_t *); isc_result_t (*getoriginnode)(dns_db_t *db, dns_dbnode_t **nodep); void (*transfernode)(dns_db_t *db, dns_dbnode_t **sourcep, dns_dbnode_t **targetp); isc_result_t (*getnsec3parameters)(dns_db_t *db, dns_dbversion_t *version, dns_hash_t *hash, uint8_t *flags, uint16_t *iterations, unsigned char *salt, size_t *salt_len); isc_result_t (*findnsec3node)(dns_db_t *db, const dns_name_t *name, bool create, dns_dbnode_t **nodep); isc_result_t (*setsigningtime)(dns_db_t *db, dns_rdataset_t *rdataset, isc_stdtime_t resign); isc_result_t (*getsigningtime)(dns_db_t *db, dns_rdataset_t *rdataset, dns_name_t *name); void (*resigned)(dns_db_t *db, dns_rdataset_t *rdataset, dns_dbversion_t *version); bool (*isdnssec)(dns_db_t *db); dns_stats_t *(*getrrsetstats)(dns_db_t *db); void (*rpz_attach)(dns_db_t *db, void *rpzs, uint8_t rpz_num); isc_result_t (*rpz_ready)(dns_db_t *db); isc_result_t (*findnodeext)(dns_db_t *db, const dns_name_t *name, bool create, dns_clientinfomethods_t *methods, dns_clientinfo_t *clientinfo, dns_dbnode_t **nodep); isc_result_t (*findext)(dns_db_t *db, const dns_name_t *name, dns_dbversion_t *version, dns_rdatatype_t type, unsigned int options, isc_stdtime_t now, dns_dbnode_t **nodep, dns_name_t *foundname, dns_clientinfomethods_t *methods, dns_clientinfo_t *clientinfo, dns_rdataset_t *rdataset, dns_rdataset_t *sigrdataset); isc_result_t (*setcachestats)(dns_db_t *db, isc_stats_t *stats); size_t (*hashsize)(dns_db_t *db); isc_result_t (*nodefullname)(dns_db_t *db, dns_dbnode_t *node, dns_name_t *name); isc_result_t (*getsize)(dns_db_t *db, dns_dbversion_t *version, uint64_t *records, uint64_t *bytes); isc_result_t (*setservestalettl)(dns_db_t *db, dns_ttl_t ttl); isc_result_t (*getservestalettl)(dns_db_t *db, dns_ttl_t *ttl); isc_result_t (*setservestalerefresh)(dns_db_t *db, uint32_t interval); isc_result_t (*getservestalerefresh)(dns_db_t *db, uint32_t *interval); isc_result_t (*setgluecachestats)(dns_db_t *db, isc_stats_t *stats); isc_result_t (*adjusthashsize)(dns_db_t *db, size_t size); void (*setmaxrrperset)(dns_db_t *db, uint32_t value); void (*setmaxtypepername)(dns_db_t *db, uint32_t value); } dns_dbmethods_t; typedef isc_result_t (*dns_dbcreatefunc_t)(isc_mem_t *mctx, const dns_name_t *name, dns_dbtype_t type, dns_rdataclass_t rdclass, unsigned int argc, char *argv[], void *driverarg, dns_db_t **dbp); typedef isc_result_t (*dns_dbupdate_callback_t)(dns_db_t *db, void *fn_arg); #define DNS_DB_MAGIC ISC_MAGIC('D', 'N', 'S', 'D') #define DNS_DB_VALID(db) ISC_MAGIC_VALID(db, DNS_DB_MAGIC) /*% * This structure is actually just the common prefix of a DNS db * implementation's version of a dns_db_t. * \brief * Direct use of this structure by clients is forbidden. DB implementations * may change the structure. 'magic' must be DNS_DB_MAGIC for any of the * dns_db_ routines to work. DB implementations must maintain all DB * invariants. */ struct dns_db { unsigned int magic; unsigned int impmagic; dns_dbmethods_t *methods; uint16_t attributes; dns_rdataclass_t rdclass; dns_name_t origin; isc_mem_t *mctx; ISC_LIST(dns_dbonupdatelistener_t) update_listeners; }; #define DNS_DBATTR_CACHE 0x01 #define DNS_DBATTR_STUB 0x02 struct dns_dbonupdatelistener { dns_dbupdate_callback_t onupdate; void *onupdate_arg; ISC_LINK(dns_dbonupdatelistener_t) link; }; /*@{*/ /*% * Options that can be specified for dns_db_find(). */ #define DNS_DBFIND_GLUEOK 0x0001 #define DNS_DBFIND_VALIDATEGLUE 0x0002 #define DNS_DBFIND_NOWILD 0x0004 #define DNS_DBFIND_PENDINGOK 0x0008 #define DNS_DBFIND_NOEXACT 0x0010 #define DNS_DBFIND_FORCENSEC 0x0020 #define DNS_DBFIND_COVERINGNSEC 0x0040 #define DNS_DBFIND_FORCENSEC3 0x0080 #define DNS_DBFIND_ADDITIONALOK 0x0100 #define DNS_DBFIND_NOZONECUT 0x0200 /* * DNS_DBFIND_STALEOK: This flag is set when BIND fails to refresh a RRset due * to timeout (resolver-query-timeout). Its intent is to try to look for stale * data in cache as a fallback, but only if stale answers are enabled in * configuration. */ #define DNS_DBFIND_STALEOK 0x0400 /* * DNS_DBFIND_STALEENABLED: This flag is used as a hint to the database that * it may use stale data. It is always set during query lookup if stale * answers are enabled, but only effectively used during stale-refresh-time * window. Also during this window, the resolver will not try to resolve the * query, in other words no attempt to refresh the data in cache is made when * the stale-refresh-time window is active. */ #define DNS_DBFIND_STALEENABLED 0x0800 /* * DNS_DBFIND_STALETIMEOUT: This flag is used when we want stale data from the * database, but not due to a failure in resolution, it also doesn't require * stale-refresh-time window timer to be active. As long as there is stale * data available, it should be returned. */ #define DNS_DBFIND_STALETIMEOUT 0x1000 /* * DNS_DBFIND_STALESTART: This flag is used to activate stale-refresh-time * window. */ #define DNS_DBFIND_STALESTART 0x2000 /*@}*/ /*@{*/ /*% * Options that can be specified for dns_db_addrdataset(). */ #define DNS_DBADD_MERGE 0x01 #define DNS_DBADD_FORCE 0x02 #define DNS_DBADD_EXACT 0x04 #define DNS_DBADD_EXACTTTL 0x08 #define DNS_DBADD_PREFETCH 0x10 /*@}*/ /*% * Options that can be specified for dns_db_subtractrdataset(). */ #define DNS_DBSUB_EXACT 0x01 #define DNS_DBSUB_WANTOLD 0x02 /*@{*/ /*% * Iterator options */ #define DNS_DB_RELATIVENAMES 0x1 #define DNS_DB_NSEC3ONLY 0x2 #define DNS_DB_NONSEC3 0x4 /*@}*/ /***** ***** Methods *****/ /*** *** Basic DB Methods ***/ isc_result_t dns_db_create(isc_mem_t *mctx, const char *db_type, const dns_name_t *origin, dns_dbtype_t type, dns_rdataclass_t rdclass, unsigned int argc, char *argv[], dns_db_t **dbp); /*%< * Create a new database using implementation 'db_type'. * * Notes: * \li All names in the database must be subdomains of 'origin' and in class * 'rdclass'. The database makes its own copy of the origin, so the * caller may do whatever they like with 'origin' and its storage once the * call returns. * * \li DB implementation-specific parameters are passed using argc and argv. * * Requires: * * \li dbp != NULL and *dbp == NULL * * \li 'origin' is a valid absolute domain name. * * \li mctx is a valid memory context * * Ensures: * * \li A copy of 'origin' has been made for the databases use, and the * caller is free to do whatever they want with the name and storage * associated with 'origin'. * * Returns: * * \li #ISC_R_SUCCESS * \li #ISC_R_NOMEMORY * \li #ISC_R_NOTFOUND db_type not found * * \li Many other errors are possible, depending on what db_type was * specified. */ void dns_db_attach(dns_db_t *source, dns_db_t **targetp); /*%< * Attach *targetp to source. * * Requires: * * \li 'source' is a valid database. * * \li 'targetp' points to a NULL dns_db_t *. * * Ensures: * * \li *targetp is attached to source. */ void dns_db_detach(dns_db_t **dbp); /*%< * Detach *dbp from its database. * * Requires: * * \li 'dbp' points to a valid database. * * Ensures: * * \li *dbp is NULL. * * \li If '*dbp' is the last reference to the database, * all resources used by the database will be freed */ bool dns_db_iscache(dns_db_t *db); /*%< * Does 'db' have cache semantics? * * Requires: * * \li 'db' is a valid database. * * Returns: * \li #true 'db' has cache semantics * \li #false otherwise */ bool dns_db_iszone(dns_db_t *db); /*%< * Does 'db' have zone semantics? * * Requires: * * \li 'db' is a valid database. * * Returns: * \li #true 'db' has zone semantics * \li #false otherwise */ bool dns_db_isstub(dns_db_t *db); /*%< * Does 'db' have stub semantics? * * Requires: * * \li 'db' is a valid database. * * Returns: * \li #true 'db' has zone semantics * \li #false otherwise */ bool dns_db_issecure(dns_db_t *db); /*%< * Is 'db' secure? * * Requires: * * \li 'db' is a valid database with zone semantics. * * Returns: * \li #true 'db' is secure. * \li #false 'db' is not secure. */ bool dns_db_isdnssec(dns_db_t *db); /*%< * Is 'db' secure or partially secure? * * Requires: * * \li 'db' is a valid database with zone semantics. * * Returns: * \li #true 'db' is secure or is partially. * \li #false 'db' is not secure. */ dns_name_t * dns_db_origin(dns_db_t *db); /*%< * The origin of the database. * * Note: caller must not try to change this name. * * Requires: * * \li 'db' is a valid database. * * Returns: * * \li The origin of the database. */ dns_rdataclass_t dns_db_class(dns_db_t *db); /*%< * The class of the database. * * Requires: * * \li 'db' is a valid database. * * Returns: * * \li The class of the database. */ isc_result_t dns_db_beginload(dns_db_t *db, dns_rdatacallbacks_t *callbacks); /*%< * Begin loading 'db'. * * Requires: * * \li 'db' is a valid database. * * \li This is the first attempt to load 'db'. * * \li 'callbacks' is a pointer to an initialized dns_rdatacallbacks_t * structure. * * Ensures: * * \li On success, callbacks->add will be a valid dns_addrdatasetfunc_t * suitable for loading records into 'db' from a raw or text zone * file. callbacks->add_private will be a valid DB load context * which should be used as 'arg' when callbacks->add is called. * callbacks->deserialize will be a valid dns_deserialize_func_t * suitable for loading 'db' from a map format zone file. * * Returns: * * \li #ISC_R_SUCCESS * \li #ISC_R_NOMEMORY * * \li Other results are possible, depending upon the database * implementation used, syntax errors in the master file, etc. */ isc_result_t dns_db_endload(dns_db_t *db, dns_rdatacallbacks_t *callbacks); /*%< * Finish loading 'db'. * * Requires: * * \li 'db' is a valid database that is being loaded. * * \li 'callbacks' is a valid dns_rdatacallbacks_t structure. * * \li callbacks->add_private is not NULL and is a valid database load context. * * Ensures: * * \li 'callbacks' is returned to its state prior to calling dns_db_beginload() * * Returns: * * \li #ISC_R_SUCCESS * \li #ISC_R_NOMEMORY * * \li Other results are possible, depending upon the database * implementation used, syntax errors in the master file, etc. */ isc_result_t dns_db_load(dns_db_t *db, const char *filename, dns_masterformat_t format, unsigned int options); /*%< * Load master file 'filename' into 'db'. * * Notes: * \li This routine is equivalent to calling * *\code * dns_db_beginload(); * dns_master_loadfile(); * dns_db_endload(); *\endcode * * Requires: * * \li 'db' is a valid database. * * \li This is the first attempt to load 'db'. * * Returns: * * \li #ISC_R_SUCCESS * \li #ISC_R_NOMEMORY * * \li Other results are possible, depending upon the database * implementation used, syntax errors in the master file, etc. */ isc_result_t dns_db_serialize(dns_db_t *db, dns_dbversion_t *version, FILE *rbtfile); /*%< * Dump version 'version' of 'db' to map-format file 'filename'. * * Requires: * * \li 'db' is a valid database. * * \li 'version' is a valid version. * * Returns: * * \li #ISC_R_SUCCESS * \li #ISC_R_NOMEMORY * * \li Other results are possible, depending upon the database * implementation used, OS file errors, etc. */ isc_result_t dns_db_dump(dns_db_t *db, dns_dbversion_t *version, const char *filename); /*%< * Dump version 'version' of 'db' to master file 'filename'. * * Requires: * * \li 'db' is a valid database. * * \li 'version' is a valid version. * * Returns: * * \li #ISC_R_SUCCESS * \li #ISC_R_NOMEMORY * * \li Other results are possible, depending upon the database * implementation used, OS file errors, etc. */ /*** *** Version Methods ***/ void dns_db_currentversion(dns_db_t *db, dns_dbversion_t **versionp); /*%< * Open the current version for reading. * * Requires: * * \li 'db' is a valid database with zone semantics. * * \li versionp != NULL && *verisonp == NULL * * Ensures: * * \li On success, '*versionp' is attached to the current version. * */ isc_result_t dns_db_newversion(dns_db_t *db, dns_dbversion_t **versionp); /*%< * Open a new version for reading and writing. * * Requires: * * \li 'db' is a valid database with zone semantics. * * \li versionp != NULL && *verisonp == NULL * * Ensures: * * \li On success, '*versionp' is attached to the current version. * * Returns: * * \li #ISC_R_SUCCESS * \li #ISC_R_NOMEMORY * * \li Other results are possible, depending upon the database * implementation used. */ void dns_db_attachversion(dns_db_t *db, dns_dbversion_t *source, dns_dbversion_t **targetp); /*%< * Attach '*targetp' to 'source'. * * Requires: * * \li 'db' is a valid database with zone semantics. * * \li source is a valid open version * * \li targetp != NULL && *targetp == NULL * * Ensures: * * \li '*targetp' is attached to source. */ void dns_db_closeversion(dns_db_t *db, dns_dbversion_t **versionp, bool commit); /*%< * Close version '*versionp'. * * Note: if '*versionp' is a read-write version and 'commit' is true, * then all changes made in the version will take effect, otherwise they * will be rolled back. The value of 'commit' is ignored for read-only * versions. * * Requires: * * \li 'db' is a valid database with zone semantics. * * \li '*versionp' refers to a valid version. * * \li If committing a writable version, then there must be no other * outstanding references to the version (e.g. an active rdataset * iterator). * * Ensures: * * \li *versionp == NULL * * \li If *versionp is a read-write version, and commit is true, then * the version will become the current version. If !commit, then all * changes made in the version will be undone, and the version will * not become the current version. */ /*** *** Node Methods ***/ isc_result_t dns_db_findnode(dns_db_t *db, const dns_name_t *name, bool create, dns_dbnode_t **nodep); isc_result_t dns_db_findnodeext(dns_db_t *db, const dns_name_t *name, bool create, dns_clientinfomethods_t *methods, dns_clientinfo_t *clientinfo, dns_dbnode_t **nodep); /*%< * Find the node with name 'name'. * * dns_db_findnodeext() (findnode extended) also accepts parameters * 'methods' and 'clientinfo', which, when provided, enable the database to * retrieve information about the client from the caller, and modify its * response on the basis of that information. * * Notes: * \li If 'create' is true and no node with name 'name' exists, then * such a node will be created. * * \li This routine is for finding or creating a node with the specified * name. There are no partial matches. It is not suitable for use * in building responses to ordinary DNS queries; clients which wish * to do that should use dns_db_find() instead. * * Requires: * * \li 'db' is a valid database. * * \li 'name' is a valid, non-empty, absolute name. * * \li nodep != NULL && *nodep == NULL * * Ensures: * * \li On success, *nodep is attached to the node with name 'name'. * * Returns: * * \li #ISC_R_SUCCESS * \li #ISC_R_NOTFOUND If !create and name not found. * \li #ISC_R_NOMEMORY Can only happen if create is true. * * \li Other results are possible, depending upon the database * implementation used. */ isc_result_t dns_db_find(dns_db_t *db, const dns_name_t *name, dns_dbversion_t *version, dns_rdatatype_t type, unsigned int options, isc_stdtime_t now, dns_dbnode_t **nodep, dns_name_t *foundname, dns_rdataset_t *rdataset, dns_rdataset_t *sigrdataset); isc_result_t dns_db_findext(dns_db_t *db, const dns_name_t *name, dns_dbversion_t *version, dns_rdatatype_t type, unsigned int options, isc_stdtime_t now, dns_dbnode_t **nodep, dns_name_t *foundname, dns_clientinfomethods_t *methods, dns_clientinfo_t *clientinfo, dns_rdataset_t *rdataset, dns_rdataset_t *sigrdataset); /*%< * Find the best match for 'name' and 'type' in version 'version' of 'db'. * * dns_db_findext() (find extended) also accepts parameters 'methods' * and 'clientinfo', which when provided enable the database to retrieve * information about the client from the caller, and modify its response * on the basis of this information. * * Notes: * * \li If type == dns_rdataset_any, then rdataset will not be bound. * * \li If 'options' does not have #DNS_DBFIND_GLUEOK set, then no glue will * be returned. For zone databases, glue is as defined in RFC2181. * For cache databases, glue is any rdataset with a trust of * dns_trust_glue. * * \li If 'options' does not have #DNS_DBFIND_ADDITIONALOK set, then no * additional records will be returned. Only caches can have * rdataset with trust dns_trust_additional. * * \li If 'options' does not have #DNS_DBFIND_PENDINGOK set, then no * pending data will be returned. This option is only meaningful for * cache databases. * * \li If the #DNS_DBFIND_NOWILD option is set, then wildcard matching will * be disabled. This option is only meaningful for zone databases. * * \li If the #DNS_DBFIND_NOZONECUT option is set, the database is * assumed to contain no zone cuts above 'name'. An implementation * may therefore choose to search for a match beginning at 'name' * rather than walking down the tree to check check for delegations. * If #DNS_DBFIND_NOWILD is not set, wildcard matching will be * attempted at each node starting at the direct ancestor of 'name' * and working up to the zone origin. This option is only meaningful * when querying redirect zones. * * \li If the #DNS_DBFIND_FORCENSEC option is set, the database is assumed to * have NSEC records, and these will be returned when appropriate. This * is only necessary when querying a database that was not secure * when created. * * \li If the DNS_DBFIND_COVERINGNSEC option is set, then look for a * NSEC record that potentially covers 'name' if a answer cannot * be found. Note the returned NSEC needs to be checked to ensure * that it is correct. This only affects answers returned from the * cache. * * \li If the #DNS_DBFIND_FORCENSEC3 option is set, then we are looking * in the NSEC3 tree and not the main tree. Without this option being * set NSEC3 records will not be found. * * \li To respond to a query for SIG records, the caller should create a * rdataset iterator and extract the signatures from each rdataset. * * \li Making queries of type ANY with #DNS_DBFIND_GLUEOK is not recommended, * because the burden of determining whether a given rdataset is valid * glue or not falls upon the caller. * * \li The 'now' field is ignored if 'db' is a zone database. If 'db' is a * cache database, an rdataset will not be found unless it expires after * 'now'. Any ANY query will not match unless at least one rdataset at * the node expires after 'now'. If 'now' is zero, then the current time * will be used. * * Requires: * * \li 'db' is a valid database. * * \li 'type' is not SIG, or a meta-RR type other than 'ANY' (e.g. 'OPT'). * * \li 'nodep' is NULL, or nodep is a valid pointer and *nodep == NULL. * * \li 'foundname' is a valid name with a dedicated buffer. * * \li 'rdataset' is NULL, or is a valid unassociated rdataset. * * Ensures, * on a non-error completion: * * \li If nodep != NULL, then it is bound to the found node. * * \li If foundname != NULL, then it contains the full name of the * found node. * * \li If rdataset != NULL and type != dns_rdatatype_any, then * rdataset is bound to the found rdataset. * * Non-error results are: * * \li #ISC_R_SUCCESS The desired node and type were * found. * * \li #DNS_R_GLUE The desired node and type were * found, but are glue. This * result can only occur if * the DNS_DBFIND_GLUEOK option * is set. This result can only * occur if 'db' is a zone * database. If type == * dns_rdatatype_any, then the * node returned may contain, or * consist entirely of invalid * glue (i.e. data occluded by a * zone cut). The caller must * take care not to return invalid * glue to a client. * * \li #DNS_R_DELEGATION The data requested is beneath * a zone cut. node, foundname, * and rdataset reference the * NS RRset of the zone cut. * If 'db' is a cache database, * then this is the deepest known * delegation. * * \li #DNS_R_ZONECUT type == dns_rdatatype_any, and * the desired node is a zonecut. * The caller must take care not * to return inappropriate glue * to a client. This result can * only occur if 'db' is a zone * database and DNS_DBFIND_GLUEOK * is set. * * \li #DNS_R_DNAME The data requested is beneath * a DNAME. node, foundname, * and rdataset reference the * DNAME RRset. * * \li #DNS_R_CNAME The rdataset requested was not * found, but there is a CNAME * at the desired name. node, * foundname, and rdataset * reference the CNAME RRset. * * \li #DNS_R_NXDOMAIN The desired name does not * exist. * * \li #DNS_R_NXRRSET The desired name exists, but * the desired type does not. * * \li #ISC_R_NOTFOUND The desired name does not * exist, and no delegation could * be found. This result can only * occur if 'db' is a cache * database. The caller should * use its nameserver(s) of last * resort (e.g. root hints). * * \li #DNS_R_NCACHENXDOMAIN The desired name does not * exist. 'node' is bound to the * cache node with the desired * name, and 'rdataset' contains * the negative caching proof. * * \li #DNS_R_NCACHENXRRSET The desired type does not * exist. 'node' is bound to the * cache node with the desired * name, and 'rdataset' contains * the negative caching proof. * * \li #DNS_R_EMPTYNAME The name exists but there is * no data at the name. * * \li #DNS_R_COVERINGNSEC The returned data is a NSEC * that potentially covers 'name'. * * \li #DNS_R_EMPTYWILD The name is a wildcard without * resource records. * * Error results: * * \li #ISC_R_NOMEMORY * * \li #DNS_R_BADDB Data that is required to be * present in the DB, e.g. an NSEC * record in a secure zone, is not * present. * * \li Other results are possible, and should all be treated as * errors. */ isc_result_t dns_db_findzonecut(dns_db_t *db, const dns_name_t *name, unsigned int options, isc_stdtime_t now, dns_dbnode_t **nodep, dns_name_t *foundname, dns_name_t *dcname, dns_rdataset_t *rdataset, dns_rdataset_t *sigrdataset); /*%< * Find the deepest known zonecut which encloses 'name' in 'db'. * * Notes: * * \li If the #DNS_DBFIND_NOEXACT option is set, then the zonecut returned * (if any) will be the deepest known ancestor of 'name'. * * \li If 'now' is zero, then the current time will be used. * * Requires: * * \li 'db' is a valid database with cache semantics. * * \li 'nodep' is NULL, or nodep is a valid pointer and *nodep == NULL. * * \li 'foundname' is a valid name with a dedicated buffer. * * \li 'dcname' is a valid name with a dedicated buffer. * * \li 'rdataset' is NULL, or is a valid unassociated rdataset. * * Ensures, on a non-error completion: * * \li If nodep != NULL, then it is bound to the found node. * * \li If foundname != NULL, then it contains the full name of the * found node. * * \li If dcname != NULL, then it contains the deepest cached name * that exists in the database. * * \li If rdataset != NULL and type != dns_rdatatype_any, then * rdataset is bound to the found rdataset. * * Non-error results are: * * \li #ISC_R_SUCCESS * * \li #ISC_R_NOTFOUND * * \li Other results are possible, and should all be treated as * errors. */ void dns_db_attachnode(dns_db_t *db, dns_dbnode_t *source, dns_dbnode_t **targetp); /*%< * Attach *targetp to source. * * Requires: * * \li 'db' is a valid database. * * \li 'source' is a valid node. * * \li 'targetp' points to a NULL dns_dbnode_t *. * * Ensures: * * \li *targetp is attached to source. */ void dns_db_detachnode(dns_db_t *db, dns_dbnode_t **nodep); /*%< * Detach *nodep from its node. * * Requires: * * \li 'db' is a valid database. * * \li 'nodep' points to a valid node. * * Ensures: * * \li *nodep is NULL. */ void dns_db_transfernode(dns_db_t *db, dns_dbnode_t **sourcep, dns_dbnode_t **targetp); /*%< * Transfer a node between pointer. * * This is equivalent to calling dns_db_attachnode() then dns_db_detachnode(). * * Requires: * * \li 'db' is a valid database. * * \li '*sourcep' is a valid node. * * \li 'targetp' points to a NULL dns_dbnode_t *. * * Ensures: * * \li '*sourcep' is NULL. */ isc_result_t dns_db_expirenode(dns_db_t *db, dns_dbnode_t *node, isc_stdtime_t now); /*%< * Mark as stale all records at 'node' which expire at or before 'now'. * * Note: if 'now' is zero, then the current time will be used. * * Requires: * * \li 'db' is a valid cache database. * * \li 'node' is a valid node. */ void dns_db_printnode(dns_db_t *db, dns_dbnode_t *node, FILE *out); /*%< * Print a textual representation of the contents of the node to * 'out'. * * Note: this function is intended for debugging, not general use. * * Requires: * * \li 'db' is a valid database. * * \li 'node' is a valid node. */ /*** *** DB Iterator Creation ***/ isc_result_t dns_db_createiterator(dns_db_t *db, unsigned int options, dns_dbiterator_t **iteratorp); /*%< * Create an iterator for version 'version' of 'db'. * * Notes: * * \li One or more of the following options can be set. * #DNS_DB_RELATIVENAMES * #DNS_DB_NSEC3ONLY * #DNS_DB_NONSEC3 * * Requires: * * \li 'db' is a valid database. * * \li iteratorp != NULL && *iteratorp == NULL * * Ensures: * * \li On success, *iteratorp will be a valid database iterator. * * Returns: * * \li #ISC_R_SUCCESS * \li #ISC_R_NOMEMORY */ /*** *** Rdataset Methods ***/ /* * XXXRTH Should we check for glue and pending data in dns_db_findrdataset()? */ isc_result_t dns_db_findrdataset(dns_db_t *db, dns_dbnode_t *node, dns_dbversion_t *version, dns_rdatatype_t type, dns_rdatatype_t covers, isc_stdtime_t now, dns_rdataset_t *rdataset, dns_rdataset_t *sigrdataset); /*%< * Search for an rdataset of type 'type' at 'node' that are in version * 'version' of 'db'. If found, make 'rdataset' refer to it. * * Notes: * * \li If 'version' is NULL, then the current version will be used. * * \li Care must be used when using this routine to build a DNS response: * 'node' should have been found with dns_db_find(), not * dns_db_findnode(). No glue checking is done. No checking for * pending data is done. * * \li The 'now' field is ignored if 'db' is a zone database. If 'db' is a * cache database, an rdataset will not be found unless it expires after * 'now'. If 'now' is zero, then the current time will be used. * * Requires: * * \li 'db' is a valid database. * * \li 'node' is a valid node. * * \li 'rdataset' is a valid, disassociated rdataset. * * \li 'sigrdataset' is a valid, disassociated rdataset, or it is NULL. * * \li If 'covers' != 0, 'type' must be RRSIG. * * \li 'type' is not a meta-RR type such as 'ANY' or 'OPT'. * * Ensures: * * \li On success, 'rdataset' is associated with the found rdataset. * * Returns: * * \li #ISC_R_SUCCESS * \li #ISC_R_NOTFOUND * * \li Other results are possible, depending upon the database * implementation used. */ isc_result_t dns_db_allrdatasets(dns_db_t *db, dns_dbnode_t *node, dns_dbversion_t *version, isc_stdtime_t now, dns_rdatasetiter_t **iteratorp); /*%< * Make '*iteratorp' an rdataset iterator for all rdatasets at 'node' in * version 'version' of 'db'. * * Notes: * * \li If 'version' is NULL, then the current version will be used. * * \li The 'now' field is ignored if 'db' is a zone database. If 'db' is a * cache database, an rdataset will not be found unless it expires after * 'now'. Any ANY query will not match unless at least one rdataset at * the node expires after 'now'. If 'now' is zero, then the current time * will be used. * * Requires: * * \li 'db' is a valid database. * * \li 'node' is a valid node. * * \li iteratorp != NULL && *iteratorp == NULL * * Ensures: * * \li On success, '*iteratorp' is a valid rdataset iterator. * * Returns: * * \li #ISC_R_SUCCESS * \li #ISC_R_NOTFOUND * * \li Other results are possible, depending upon the database * implementation used. */ isc_result_t dns_db_addrdataset(dns_db_t *db, dns_dbnode_t *node, dns_dbversion_t *version, isc_stdtime_t now, dns_rdataset_t *rdataset, unsigned int options, dns_rdataset_t *addedrdataset); /*%< * Add 'rdataset' to 'node' in version 'version' of 'db'. * * Notes: * * \li If the database has zone semantics, the #DNS_DBADD_MERGE option is set, * and an rdataset of the same type as 'rdataset' already exists at * 'node' then the contents of 'rdataset' will be merged with the existing * rdataset. If the option is not set, then rdataset will replace any * existing rdataset of the same type. If not merging and the * #DNS_DBADD_FORCE option is set, then the data will update the database * without regard to trust levels. If not forcing the data, then the * rdataset will only be added if its trust level is >= the trust level of * any existing rdataset. Forcing is only meaningful for cache databases. * If #DNS_DBADD_EXACT is set then there must be no rdata in common between * the old and new rdata sets. If #DNS_DBADD_EXACTTTL is set then both * the old and new rdata sets must have the same ttl. * * \li The 'now' field is ignored if 'db' is a zone database. If 'db' is * a cache database, then the added rdataset will expire no later than * now + rdataset->ttl. * * \li If 'addedrdataset' is not NULL, then it will be attached to the * resulting new rdataset in the database, or to the existing data if * the existing data was better. * * Requires: * * \li 'db' is a valid database. * * \li 'node' is a valid node. * * \li 'rdataset' is a valid, associated rdataset with the same class * as 'db'. * * \li 'addedrdataset' is NULL, or a valid, unassociated rdataset. * * \li The database has zone semantics and 'version' is a valid * read-write version, or the database has cache semantics * and version is NULL. * * \li If the database has cache semantics, the #DNS_DBADD_MERGE option must * not be set. * * Returns: * * \li #ISC_R_SUCCESS * \li #DNS_R_UNCHANGED The operation did not change * anything. \li #ISC_R_NOMEMORY \li #DNS_R_NOTEXACT * * \li Other results are possible, depending upon the database * implementation used. */ isc_result_t dns_db_subtractrdataset(dns_db_t *db, dns_dbnode_t *node, dns_dbversion_t *version, dns_rdataset_t *rdataset, unsigned int options, dns_rdataset_t *newrdataset); /*%< * Remove any rdata in 'rdataset' from 'node' in version 'version' of * 'db'. * * Notes: * * \li If 'newrdataset' is not NULL, then it will be attached to the * resulting new rdataset in the database, unless the rdataset has * become nonexistent. If DNS_DBSUB_EXACT is set then all elements * of 'rdataset' must exist at 'node'. * *\li If DNS_DBSUB_WANTOLD is set and the entire rdataset was deleted * then return the original rdatatset in newrdataset if that existed. * * Requires: * * \li 'db' is a valid database. * * \li 'node' is a valid node. * * \li 'rdataset' is a valid, associated rdataset with the same class * as 'db'. * * \li 'newrdataset' is NULL, or a valid, unassociated rdataset. * * \li The database has zone semantics and 'version' is a valid * read-write version. * * Returns: * * \li #ISC_R_SUCCESS * \li #DNS_R_UNCHANGED The operation did not change * anything. \li #DNS_R_NXRRSET All rdata of the same *type as * those in 'rdataset' have been deleted. \li #DNS_R_NOTEXACT * Some part of 'rdataset' did not exist and DNS_DBSUB_EXACT was set. * * \li Other results are possible, depending upon the database * implementation used. */ isc_result_t dns_db_deleterdataset(dns_db_t *db, dns_dbnode_t *node, dns_dbversion_t *version, dns_rdatatype_t type, dns_rdatatype_t covers); /*%< * Make it so that no rdataset of type 'type' exists at 'node' in version * version 'version' of 'db'. * * Notes: * * \li If 'type' is dns_rdatatype_any, then no rdatasets will exist in * 'version' (provided that the dns_db_deleterdataset() isn't followed * by one or more dns_db_addrdataset() calls). * * Requires: * * \li 'db' is a valid database. * * \li 'node' is a valid node. * * \li The database has zone semantics and 'version' is a valid * read-write version, or the database has cache semantics * and version is NULL. * * \li 'type' is not a meta-RR type, except for dns_rdatatype_any, which is * allowed. * * \li If 'covers' != 0, 'type' must be SIG. * * Returns: * * \li #ISC_R_SUCCESS * \li #DNS_R_UNCHANGED No rdatasets of 'type' existed * before the operation was attempted. * * \li Other results are possible, depending upon the database * implementation used. */ isc_result_t dns_db_getsoaserial(dns_db_t *db, dns_dbversion_t *ver, uint32_t *serialp); /*%< * Get the current SOA serial number from a zone database. * * Requires: * \li 'db' is a valid database with zone semantics. * \li 'ver' is a valid version. */ void dns_db_overmem(dns_db_t *db, bool overmem); /*%< * Enable / disable aggressive cache cleaning. */ unsigned int dns_db_nodecount(dns_db_t *db); /*%< * Count the number of nodes in 'db'. * * Requires: * * \li 'db' is a valid database. * * Returns: * \li The number of nodes in the database */ size_t dns_db_hashsize(dns_db_t *db); /*%< * For database implementations using a hash table, report the * current number of buckets. * * Requires: * * \li 'db' is a valid database. * * Returns: * \li The number of buckets in the database's hash table, or * 0 if not implemented. */ isc_result_t dns_db_adjusthashsize(dns_db_t *db, size_t size); /*%< * For database implementations using a hash table, adjust the size of * the hash table to store objects with a maximum total memory footprint * of 'size' bytes. If 'size' is set to 0, it means no finite limit is * requested. * * Requires: * * \li 'db' is a valid database. * \li 'size' is maximum memory footprint of the database in bytes * * Returns: * \li #ISC_R_SUCCESS The registration succeeded * \li #ISC_R_NOMEMORY Out of memory */ void dns_db_settask(dns_db_t *db, isc_task_t *task); /*%< * If task is set then the final detach maybe performed asynchronously. * * Requires: * \li 'db' is a valid database. * \li 'task' to be valid or NULL. */ bool dns_db_ispersistent(dns_db_t *db); /*%< * Is 'db' persistent? A persistent database does not need to be loaded * from disk or written to disk. * * Requires: * * \li 'db' is a valid database. * * Returns: * \li #true 'db' is persistent. * \li #false 'db' is not persistent. */ isc_result_t dns_db_register(const char *name, dns_dbcreatefunc_t create, void *driverarg, isc_mem_t *mctx, dns_dbimplementation_t **dbimp); /*%< * Register a new database implementation and add it to the list of * supported implementations. * * Requires: * * \li 'name' is not NULL * \li 'order' is a valid function pointer * \li 'mctx' is a valid memory context * \li dbimp != NULL && *dbimp == NULL * * Returns: * \li #ISC_R_SUCCESS The registration succeeded * \li #ISC_R_NOMEMORY Out of memory * \li #ISC_R_EXISTS A database implementation with the same name exists * * Ensures: * * \li *dbimp points to an opaque structure which must be passed to * dns_db_unregister(). */ void dns_db_unregister(dns_dbimplementation_t **dbimp); /*%< * Remove a database implementation from the list of supported * implementations. No databases of this type can be active when this * is called. * * Requires: * \li dbimp != NULL && *dbimp == NULL * * Ensures: * * \li Any memory allocated in *dbimp will be freed. */ isc_result_t dns_db_getoriginnode(dns_db_t *db, dns_dbnode_t **nodep); /*%< * Get the origin DB node corresponding to the DB's zone. This function * should typically succeed unless the underlying DB implementation doesn't * support the feature. * * Requires: * * \li 'db' is a valid zone database. * \li 'nodep' != NULL && '*nodep' == NULL * * Ensures: * \li On success, '*nodep' will point to the DB node of the zone's origin. * * Returns: * \li #ISC_R_SUCCESS * \li #ISC_R_NOTFOUND - the DB implementation does not support this feature. */ isc_result_t dns_db_getnsec3parameters(dns_db_t *db, dns_dbversion_t *version, dns_hash_t *hash, uint8_t *flags, uint16_t *iterations, unsigned char *salt, size_t *salt_length); /*%< * Get the NSEC3 parameters that are associated with this zone. * * Requires: * \li 'db' is a valid zone database. * * Returns: * \li #ISC_R_SUCCESS * \li #ISC_R_NOTFOUND - the DB implementation does not support this feature * or this zone does not have NSEC3 records. */ isc_result_t dns_db_getsize(dns_db_t *db, dns_dbversion_t *version, uint64_t *records, uint64_t *xfrsize); /*%< * On success if 'records' is not NULL, it is set to the number of records * in the given version of the database. If 'xfrisize' is not NULL, it is * set to the approximate number of bytes needed to transfer the records, * counting name, TTL, type, class, and rdata for each RR. (This is meant * to be a rough approximation of the size of a full zone transfer, though * it does not take into account DNS message overhead or name compression.) * * Requires: * \li 'db' is a valid zone database. * \li 'version' is NULL or a valid version. * \li 'records' is NULL or a pointer to return the record count in. * \li 'xfrsize' is NULL or a pointer to return the byte count in. * * Returns: * \li #ISC_R_SUCCESS * \li #ISC_R_NOTIMPLEMENTED */ isc_result_t dns_db_findnsec3node(dns_db_t *db, const dns_name_t *name, bool create, dns_dbnode_t **nodep); /*%< * Find the NSEC3 node with name 'name'. * * Notes: * \li If 'create' is true and no node with name 'name' exists, then * such a node will be created. * * Requires: * * \li 'db' is a valid database. * * \li 'name' is a valid, non-empty, absolute name. * * \li nodep != NULL && *nodep == NULL * * Ensures: * * \li On success, *nodep is attached to the node with name 'name'. * * Returns: * * \li #ISC_R_SUCCESS * \li #ISC_R_NOTFOUND If !create and name not found. * \li #ISC_R_NOMEMORY Can only happen if create is true. * * \li Other results are possible, depending upon the database * implementation used. */ isc_result_t dns_db_setsigningtime(dns_db_t *db, dns_rdataset_t *rdataset, isc_stdtime_t resign); /*%< * Sets the re-signing time associated with 'rdataset' to 'resign'. * * Requires: * \li 'db' is a valid zone database. * \li 'rdataset' is or is to be associated with 'db'. * \li 'rdataset' is not pending removed from the heap via an * uncommitted call to dns_db_resigned(). * * Returns: * \li #ISC_R_SUCCESS * \li #ISC_R_NOMEMORY * \li #ISC_R_NOTIMPLEMENTED - Not supported by this DB implementation. */ isc_result_t dns_db_getsigningtime(dns_db_t *db, dns_rdataset_t *rdataset, dns_name_t *name); /*%< * Return the rdataset with the earliest signing time in the zone. * Note: the rdataset is version agnostic. * * Requires: * \li 'db' is a valid zone database. * \li 'rdataset' to be initialized but not associated. * \li 'name' to be NULL or have a buffer associated with it. * * Returns: * \li #ISC_R_SUCCESS * \li #ISC_R_NOTFOUND - No dataset exists. */ void dns_db_resigned(dns_db_t *db, dns_rdataset_t *rdataset, dns_dbversion_t *version); /*%< * Mark 'rdataset' as not being available to be returned by * dns_db_getsigningtime(). If the changes associated with 'version' * are committed this will be permanent. If the version is not committed * this change will be rolled back when the version is closed. Until * 'version' is either committed or rolled back, 'rdataset' can no longer * be acted upon by dns_db_setsigningtime(). * * Requires: * \li 'db' is a valid zone database. * \li 'rdataset' to be associated with 'db'. * \li 'version' to be open for writing. */ dns_stats_t * dns_db_getrrsetstats(dns_db_t *db); /*%< * Get statistics information counting RRsets stored in the DB, when available. * The statistics may not be available depending on the DB implementation. * * Requires: * * \li 'db' is a valid database (cache only). * * Returns: * \li when available, a pointer to a statistics object created by * dns_rdatasetstats_create(); otherwise NULL. */ isc_result_t dns_db_setcachestats(dns_db_t *db, isc_stats_t *stats); /*%< * Set the location in which to collect cache statistics. * This option may not exist depending on the DB implementation. * * Requires: * * \li 'db' is a valid database (cache only). * * Returns: * \li when available, a pointer to a statistics object created by * dns_rdatasetstats_create(); otherwise NULL. */ void dns_db_rpz_attach(dns_db_t *db, void *rpzs, uint8_t rpz_num) ISC_DEPRECATED; /*%< * Attach the response policy information for a view to a database for a * zone for the view. */ isc_result_t dns_db_rpz_ready(dns_db_t *db) ISC_DEPRECATED; /*%< * Finish loading a response policy zone. */ isc_result_t dns_db_updatenotify_register(dns_db_t *db, dns_dbupdate_callback_t fn, void *fn_arg); /*%< * Register a notify-on-update callback function to a database. * * Requires: * * \li 'db' is a valid database * \li 'db' does not have an update callback registered * \li 'fn' is not NULL * */ isc_result_t dns_db_updatenotify_unregister(dns_db_t *db, dns_dbupdate_callback_t fn, void *fn_arg); /*%< * Unregister a notify-on-update callback. * * Requires: * * \li 'db' is a valid database * \li 'db' has update callback registered * */ isc_result_t dns_db_nodefullname(dns_db_t *db, dns_dbnode_t *node, dns_name_t *name); /*%< * Get the name associated with a database node. * * Requires: * * \li 'db' is a valid database * \li 'node' and 'name' are not NULL */ isc_result_t dns_db_setservestalettl(dns_db_t *db, dns_ttl_t ttl); /*%< * Sets the maximum length of time that cached answers may be retained * past their normal TTL. Default value for the library is 0, disabling * the use of stale data. * * Requires: * \li 'db' is a valid cache database. * \li 'ttl' is the number of seconds to retain data past its normal expiry. * * Returns: * \li #ISC_R_SUCCESS * \li #ISC_R_NOTIMPLEMENTED - Not supported by this DB implementation. */ isc_result_t dns_db_getservestalettl(dns_db_t *db, dns_ttl_t *ttl); /*%< * Gets maximum length of time that cached answers may be kept past * normal TTL expiration. * * Requires: * \li 'db' is a valid cache database. * \li 'ttl' is the number of seconds to retain data past its normal expiry. * * Returns: * \li #ISC_R_SUCCESS * \li #ISC_R_NOTIMPLEMENTED - Not supported by this DB implementation. */ isc_result_t dns_db_setservestalerefresh(dns_db_t *db, uint32_t interval); /*%< * Sets the length of time to wait before attempting to refresh a rrset * if a previous attempt in doing so has failed. * During this time window if stale rrset are available in cache they * will be directly returned to client. * * Requires: * \li 'db' is a valid cache database. * \li 'interval' is number of seconds before attempting to refresh data. * * Returns: * \li #ISC_R_SUCCESS * \li #ISC_R_NOTIMPLEMENTED - Not supported by this DB implementation. */ isc_result_t dns_db_getservestalerefresh(dns_db_t *db, uint32_t *interval); /*%< * Gets the length of time in which stale answers are directly returned from * cache before attempting to refresh them, in case a previous attempt in * doing so has failed. * * Requires: * \li 'db' is a valid cache database. * \li 'interval' is number of seconds before attempting to refresh data. * * Returns: * \li #ISC_R_SUCCESS * \li #ISC_R_NOTIMPLEMENTED - Not supported by this DB implementation. */ isc_result_t dns_db_setgluecachestats(dns_db_t *db, isc_stats_t *stats); /*%< * Set the location in which to collect glue cache statistics. * This option may not exist depending on the DB implementation. * * Requires: * * \li 'db' is a valid database (cache only). * * Returns: * \li when available, a pointer to a statistics object created by * dns_rdatasetstats_create(); otherwise NULL. */ void dns_db_setmaxrrperset(dns_db_t *db, uint32_t value); /*%< * Set the maximum permissible number of RRs per RRset. If 'value' * is nonzero, then any subsequent attempt to add an rdataset with * more than 'value' RRs will return ISC_R_NOSPACE. */ void dns_db_setmaxtypepername(dns_db_t *db, uint32_t value); /*%< * Set the maximum permissible number of RR types per owner name. * * If 'value' is nonzero, then any subsequent attempt to add an rdataset with a * RR type that would exceed the number of already stored RR types will return * ISC_R_NOSPACE. */ ISC_LANG_ENDDECLS #endif /* DNS_DB_H */