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C/C++ Source or Header | 2008-09-17 | 33.7 KB | 1,300 lines

/* * Copyright (C) 2004, 2005, 2007 Internet Systems Consortium, Inc. ("ISC") * Copyright (C) 1999-2003 Internet Software Consortium. * * Permission to use, copy, modify, and/or distribute this software for any * purpose with or without fee is hereby granted, provided that the above * copyright notice and this permission notice appear in all copies. * * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY * AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT, * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR * PERFORMANCE OF THIS SOFTWARE. */ /* $Id: db.h,v 1.76.18.10 2007/08/28 07:20:05 tbox Exp $ */ #ifndef DNS_DB_H #define DNS_DB_H 1 /***** ***** Module Info *****/ /*! \file * \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 <isc/lang.h> #include <isc/magic.h> #include <isc/ondestroy.h> #include <isc/stdtime.h> #include <dns/name.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_addrdatasetfunc_t *addp, dns_dbload_t **dbloadp); isc_result_t (*endload)(dns_db_t *db, dns_dbload_t **dbloadp); 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, isc_boolean_t commit); isc_result_t (*findnode)(dns_db_t *db, dns_name_t *name, isc_boolean_t create, dns_dbnode_t **nodep); isc_result_t (*find)(dns_db_t *db, 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, dns_name_t *name, unsigned int options, isc_stdtime_t now, dns_dbnode_t **nodep, dns_name_t *foundname, 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, isc_boolean_t relative_names, 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); isc_boolean_t (*issecure)(dns_db_t *db); unsigned int (*nodecount)(dns_db_t *db); isc_boolean_t (*ispersistent)(dns_db_t *db); void (*overmem)(dns_db_t *db, isc_boolean_t overmem); void (*settask)(dns_db_t *db, isc_task_t *); isc_result_t (*getoriginnode)(dns_db_t *db, dns_dbnode_t **nodep); } dns_dbmethods_t; typedef isc_result_t (*dns_dbcreatefunc_t)(isc_mem_t *mctx, dns_name_t *name, dns_dbtype_t type, dns_rdataclass_t rdclass, unsigned int argc, char *argv[], void *driverarg, dns_db_t **dbp); #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; isc_uint16_t attributes; dns_rdataclass_t rdclass; dns_name_t origin; isc_ondestroy_t ondest; isc_mem_t * mctx; }; #define DNS_DBATTR_CACHE 0x01 #define DNS_DBATTR_STUB 0x02 /*@{*/ /*% * Options that can be specified for dns_db_find(). */ #define DNS_DBFIND_GLUEOK 0x01 #define DNS_DBFIND_VALIDATEGLUE 0x02 #define DNS_DBFIND_NOWILD 0x04 #define DNS_DBFIND_PENDINGOK 0x08 #define DNS_DBFIND_NOEXACT 0x10 #define DNS_DBFIND_FORCENSEC 0x20 #define DNS_DBFIND_COVERINGNSEC 0x40 /*@}*/ /*@{*/ /*% * 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 /*@}*/ /*% * Options that can be specified for dns_db_subtractrdataset(). */ #define DNS_DBSUB_EXACT 0x01 /***** ***** Methods *****/ /*** *** Basic DB Methods ***/ isc_result_t dns_db_create(isc_mem_t *mctx, const char *db_type, 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 */ isc_result_t dns_db_ondestroy(dns_db_t *db, isc_task_t *task, isc_event_t **eventp); /*%< * Causes 'eventp' to be sent to be sent to 'task' when the database is * destroyed. * * Note; ownership of the eventp is taken from the caller (and *eventp is * set to NULL). The sender field of the event is set to 'db' before it is * sent to the task. */ isc_boolean_t dns_db_iscache(dns_db_t *db); /*%< * Does 'db' have cache semantics? * * Requires: * * \li 'db' is a valid database. * * Returns: * \li #ISC_TRUE 'db' has cache semantics * \li #ISC_FALSE otherwise */ isc_boolean_t dns_db_iszone(dns_db_t *db); /*%< * Does 'db' have zone semantics? * * Requires: * * \li 'db' is a valid database. * * Returns: * \li #ISC_TRUE 'db' has zone semantics * \li #ISC_FALSE otherwise */ isc_boolean_t dns_db_isstub(dns_db_t *db); /*%< * Does 'db' have stub semantics? * * Requires: * * \li 'db' is a valid database. * * Returns: * \li #ISC_TRUE 'db' has zone semantics * \li #ISC_FALSE otherwise */ isc_boolean_t dns_db_issecure(dns_db_t *db); /*%< * Is 'db' secure? * * Requires: * * \li 'db' is a valid database with zone semantics. * * Returns: * \li #ISC_TRUE 'db' is secure. * \li #ISC_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_addrdatasetfunc_t *addp, dns_dbload_t **dbloadp); /*%< * Begin loading 'db'. * * Requires: * * \li 'db' is a valid database. * * \li This is the first attempt to load 'db'. * * \li addp != NULL && *addp == NULL * * \li dbloadp != NULL && *dbloadp == NULL * * Ensures: * * \li On success, *addp will be a valid dns_addrdatasetfunc_t suitable * for loading 'db'. *dbloadp will be a valid DB load context which * should be used as 'arg' when *addp is called. * * 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_dbload_t **dbloadp); /*%< * Finish loading 'db'. * * Requires: * * \li 'db' is a valid database that is being loaded. * * \li dbloadp != NULL and *dbloadp is a valid database load context. * * Ensures: * * \li *dbloadp == NULL * * 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); isc_result_t dns_db_load2(dns_db_t *db, const char *filename, dns_masterformat_t format); /*%< * 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_dump(dns_db_t *db, dns_dbversion_t *version, const char *filename); isc_result_t dns_db_dump2(dns_db_t *db, dns_dbversion_t *version, const char *filename, dns_masterformat_t masterformat); /*%< * 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, isc_boolean_t commit); /*%< * Close version '*versionp'. * * Note: if '*versionp' is a read-write version and 'commit' is ISC_TRUE, * then all changes made in the version will take effect, otherwise they * will be rolled back. The value if '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 ISC_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, dns_name_t *name, isc_boolean_t create, dns_dbnode_t **nodep); /*%< * Find the node with name 'name'. * * Notes: * \li If 'create' is ISC_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 ISC_TRUE. * * \li Other results are possible, depending upon the database * implementation used. */ isc_result_t dns_db_find(dns_db_t *db, 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); /*%< * Find the best match for 'name' and 'type' in version 'version' of 'db'. * * 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_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_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 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_WILDCARD The desired node and type were * found after performing * wildcard matching. This is * only returned if the * #DNS_DBFIND_INDICATEWILD * option is set; otherwise * #ISC_R_SUCCESS is returned. * * \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'. * * 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, dns_name_t *name, unsigned int options, isc_stdtime_t now, dns_dbnode_t **nodep, dns_name_t *foundname, 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 '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 * * \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. */ 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, isc_boolean_t relative_names, dns_dbiterator_t **iteratorp); /*%< * Create an iterator for version 'version' of 'db'. * * Notes: * * \li If 'relative_names' is ISC_TRUE, then node names returned by the * iterator will be relative to the iterator's current origin. If * #ISC_FALSE, then the node names will be absolute. * * 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 SIG. * * \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 iteratator 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'. * * 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, isc_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, isc_boolean_t overmem); /*%< * Enable / disable agressive 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 */ 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. */ isc_boolean_t 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 #ISC_TRUE 'db' is persistent. * \li #ISC_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 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_LANG_ENDDECLS #endif /* DNS_DB_H */