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- /*
- * Copyright (C) 1999-2001 Internet Software Consortium.
- *
- * Permission to use, copy, modify, and 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 INTERNET SOFTWARE CONSORTIUM
- * DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL
- * INTERNET SOFTWARE CONSORTIUM 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 1.67 2001/08/28 03:58:13 marka Exp $ */
- #ifndef DNS_DB_H
- #define DNS_DB_H 1
- /*****
- ***** Module Info
- *****/
- /*
- * DNS DB
- *
- * 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:
- * The module ensures appropriate synchronization of data structures it
- * creates and manipulates.
- *
- * Reliability:
- * No anticipated impact.
- *
- * Resources:
- * <TBS>
- *
- * Security:
- * No anticipated impact.
- *
- * Standards:
- * 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);
- 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);
- } 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.
- *
- * 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
- /*
- * 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:
- * 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.
- *
- * DB implementation-specific parameters are passed using argc and argv.
- *
- * Requires:
- *
- * dbp != NULL and *dbp == NULL
- *
- * 'origin' is a valid absolute domain name.
- *
- * mctx is a valid memory context
- *
- * Ensures:
- *
- * 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:
- *
- * ISC_R_SUCCESS
- * ISC_R_NOMEMORY
- * ISC_R_NOTFOUND db_type not found
- *
- * 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:
- *
- * 'source' is a valid database.
- *
- * 'targetp' points to a NULL dns_db_t *.
- *
- * Ensures:
- *
- * *targetp is attached to source.
- */
- void
- dns_db_detach(dns_db_t **dbp);
- /*
- * Detach *dbp from its database.
- *
- * Requires:
- *
- * 'dbp' points to a valid database.
- *
- * Ensures:
- *
- * *dbp is NULL.
- *
- * 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; ownrship 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:
- *
- * 'db' is a valid database.
- *
- * Returns:
- * ISC_TRUE 'db' has cache semantics
- * ISC_FALSE otherwise
- */
- isc_boolean_t
- dns_db_iszone(dns_db_t *db);
- /*
- * Does 'db' have zone semantics?
- *
- * Requires:
- *
- * 'db' is a valid database.
- *
- * Returns:
- * ISC_TRUE 'db' has zone semantics
- * ISC_FALSE otherwise
- */
- isc_boolean_t
- dns_db_isstub(dns_db_t *db);
- /*
- * Does 'db' have stub semantics?
- *
- * Requires:
- *
- * 'db' is a valid database.
- *
- * Returns:
- * ISC_TRUE 'db' has zone semantics
- * ISC_FALSE otherwise
- */
- isc_boolean_t
- dns_db_issecure(dns_db_t *db);
- /*
- * Is 'db' secure?
- *
- * Requires:
- *
- * 'db' is a valid database with zone semantics.
- *
- * Returns:
- * ISC_TRUE 'db' is secure.
- * 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:
- *
- * 'db' is a valid database.
- *
- * Returns:
- *
- * The origin of the database.
- */
- dns_rdataclass_t
- dns_db_class(dns_db_t *db);
- /*
- * The class of the database.
- *
- * Requires:
- *
- * 'db' is a valid database.
- *
- * Returns:
- *
- * 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:
- *
- * 'db' is a valid database.
- *
- * This is the first attempt to load 'db'.
- *
- * addp != NULL && *addp == NULL
- *
- * dbloadp != NULL && *dbloadp == NULL
- *
- * Ensures:
- *
- * 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:
- *
- * ISC_R_SUCCESS
- * ISC_R_NOMEMORY
- *
- * 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:
- *
- * 'db' is a valid database that is being loaded.
- *
- * dbloadp != NULL and *dbloadp is a valid database load context.
- *
- * Ensures:
- *
- * *dbloadp == NULL
- *
- * Returns:
- *
- * ISC_R_SUCCESS
- * ISC_R_NOMEMORY
- *
- * 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);
- /*
- * Load master file 'filename' into 'db'.
- *
- * Notes:
- * This routine is equivalent to calling
- *
- * dns_db_beginload();
- * dns_master_loadfile();
- * dns_db_endload();
- *
- * Requires:
- *
- * 'db' is a valid database.
- *
- * This is the first attempt to load 'db'.
- *
- * Returns:
- *
- * ISC_R_SUCCESS
- * ISC_R_NOMEMORY
- *
- * 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);
- /*
- * Dump version 'version' of 'db' to master file 'filename'.
- *
- * Requires:
- *
- * 'db' is a valid database.
- *
- * 'version' is a valid version.
- *
- * Returns:
- *
- * ISC_R_SUCCESS
- * ISC_R_NOMEMORY
- *
- * 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:
- *
- * 'db' is a valid database with zone semantics.
- *
- * versionp != NULL && *verisonp == NULL
- *
- * Ensures:
- *
- * 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:
- *
- * 'db' is a valid database with zone semantics.
- *
- * versionp != NULL && *verisonp == NULL
- *
- * Ensures:
- *
- * On success, '*versionp' is attached to the current version.
- *
- * Returns:
- *
- * ISC_R_SUCCESS
- * ISC_R_NOMEMORY
- *
- * 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:
- *
- * 'db' is a valid database with zone semantics.
- *
- * source is a valid open version
- *
- * targetp != NULL && *targetp == NULL
- *
- * Ensures:
- *
- * '*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:
- *
- * 'db' is a valid database with zone semantics.
- *
- * '*versionp' refers to a valid version.
- *
- * If committing a writable version, then there must be no other
- * outstanding references to the version (e.g. an active rdataset
- * iterator).
- *
- * Ensures:
- *
- * *versionp == NULL
- *
- * 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:
- * If 'create' is ISC_TRUE and no node with name 'name' exists, then
- * such a node will be created.
- *
- * 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:
- *
- * 'db' is a valid database.
- *
- * 'name' is a valid, non-empty, absolute name that is a subdomain of
- * the database's origin. (It need not be a proper subdomain.)
- *
- * nodep != NULL && *nodep == NULL
- *
- * Ensures:
- *
- * On success, *nodep is attached to the node with name 'name'.
- *
- * Returns:
- *
- * ISC_R_SUCCESS
- * ISC_R_NOTFOUND If !create and name not found.
- * ISC_R_NOMEMORY Can only happen if create is ISC_TRUE.
- *
- * 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:
- *
- * If type == dns_rdataset_any, then rdataset will not be bound.
- *
- * If 'options' does not have DNS_DBFIND_GLUEOK set, then no glue will
- * be returned. For zone databases, glue is as defined in RFC 2181.
- * For cache databases, glue is any rdataset with a trust of
- * dns_trust_glue.
- *
- * If 'options' does not have DNS_DBFIND_PENDINGOK set, then no
- * pending data will be returned. This option is only meaningful for
- * cache databases.
- *
- * If the DNS_DBFIND_NOWILD option is set, then wildcard matching will
- * be disabled. This option is only meaningful for zone databases.
- *
- * To respond to a query for SIG records, the caller should create a
- * rdataset iterator and extract the signatures from each rdataset.
- *
- * 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.
- *
- * 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:
- *
- * 'db' is a valid database.
- *
- * 'type' is not SIG, or a meta-RR type other than 'ANY' (e.g. 'OPT').
- *
- * 'nodep' is NULL, or nodep is a valid pointer and *nodep == NULL.
- *
- * 'foundname' is a valid name with a dedicated buffer.
- *
- * 'rdataset' is NULL, or is a valid unassociated rdataset.
- *
- * Ensures:
- * On a non-error completion:
- *
- * If nodep != NULL, then it is bound to the found node.
- *
- * If foundname != NULL, then it contains the full name of the
- * found node.
- *
- * If rdataset != NULL and type != dns_rdatatype_any, then
- * rdataset is bound to the found rdataset.
- *
- * Returns:
- *
- * Non-error results are:
- *
- * ISC_R_SUCCESS The desired node and type were
- * found.
- *
- * 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.
- *
- * 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.
- *
- * 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.
- *
- * DNS_R_DNAME The data requested is beneath
- * a DNAME. node, foundname,
- * and rdataset reference the
- * DNAME RRset.
- *
- * 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.
- *
- * DNS_R_NXDOMAIN The desired name does not
- * exist.
- *
- * DNS_R_NXRRSET The desired name exists, but
- * the desired type does not.
- *
- * 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).
- *
- * 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.
- *
- * 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.
- *
- * Error results:
- *
- * ISC_R_NOMEMORY
- *
- * DNS_R_BADDB Data that is required to be
- * present in the DB, e.g. an NXT
- * record in a secure zone, is not
- * present.
- *
- * 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:
- *
- * If the DNS_DBFIND_NOEXACT option is set, then the zonecut returned
- * (if any) will be the deepest known ancestor of 'name'.
- *
- * If 'now' is zero, then the current time will be used.
- *
- * Requires:
- *
- * 'db' is a valid database with cache semantics.
- *
- * 'nodep' is NULL, or nodep is a valid pointer and *nodep == NULL.
- *
- * 'foundname' is a valid name with a dedicated buffer.
- *
- * 'rdataset' is NULL, or is a valid unassociated rdataset.
- *
- * Ensures:
- * On a non-error completion:
- *
- * If nodep != NULL, then it is bound to the found node.
- *
- * If foundname != NULL, then it contains the full name of the
- * found node.
- *
- * If rdataset != NULL and type != dns_rdatatype_any, then
- * rdataset is bound to the found rdataset.
- *
- * Returns:
- *
- * Non-error results are:
- *
- * ISC_R_SUCCESS
- *
- * ISC_R_NOTFOUND
- *
- * 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:
- *
- * 'db' is a valid database.
- *
- * 'source' is a valid node.
- *
- * 'targetp' points to a NULL dns_node_t *.
- *
- * Ensures:
- *
- * *targetp is attached to source.
- */
- void
- dns_db_detachnode(dns_db_t *db, dns_dbnode_t **nodep);
- /*
- * Detach *nodep from its node.
- *
- * Requires:
- *
- * 'db' is a valid database.
- *
- * 'nodep' points to a valid node.
- *
- * Ensures:
- *
- * *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:
- *
- * 'db' is a valid cache database.
- *
- * '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:
- *
- * 'db' is a valid database.
- *
- * '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:
- *
- * 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:
- *
- * 'db' is a valid database.
- *
- * iteratorp != NULL && *iteratorp == NULL
- *
- * Ensures:
- *
- * On success, *iteratorp will be a valid database iterator.
- *
- * Returns:
- *
- * ISC_R_SUCCESS
- * 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:
- *
- * If 'version' is NULL, then the current version will be used.
- *
- * 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.
- *
- * 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:
- *
- * 'db' is a valid database.
- *
- * 'node' is a valid node.
- *
- * 'rdataset' is a valid, disassociated rdataset.
- *
- * 'sigrdataset' is a valid, disassociated rdataset, or it is NULL.
- *
- * If 'covers' != 0, 'type' must be SIG.
- *
- * 'type' is not a meta-RR type such as 'ANY' or 'OPT'.
- *
- * Ensures:
- *
- * On success, 'rdataset' is associated with the found rdataset.
- *
- * Returns:
- *
- * ISC_R_SUCCESS
- * ISC_R_NOTFOUND
- *
- * 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:
- *
- * If 'version' is NULL, then the current version will be used.
- *
- * 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:
- *
- * 'db' is a valid database.
- *
- * 'node' is a valid node.
- *
- * iteratorp != NULL && *iteratorp == NULL
- *
- * Ensures:
- *
- * On success, '*iteratorp' is a valid rdataset iterator.
- *
- * Returns:
- *
- * ISC_R_SUCCESS
- * ISC_R_NOTFOUND
- *
- * 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:
- *
- * 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.
- *
- * 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.
- *
- * 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:
- *
- * 'db' is a valid database.
- *
- * 'node' is a valid node.
- *
- * 'rdataset' is a valid, associated rdataset with the same class
- * as 'db'.
- *
- * 'addedrdataset' is NULL, or a valid, unassociated rdataset.
- *
- * The database has zone semantics and 'version' is a valid
- * read-write version, or the database has cache semantics
- * and version is NULL.
- *
- * If the database has cache semantics, the DNS_DBADD_MERGE option must
- * not be set.
- *
- * Returns:
- *
- * ISC_R_SUCCESS
- * DNS_R_UNCHANGED The operation did not change anything.
- * ISC_R_NOMEMORY
- * DNS_R_NOTEXACT
- *
- * 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:
- *
- * 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:
- *
- * 'db' is a valid database.
- *
- * 'node' is a valid node.
- *
- * 'rdataset' is a valid, associated rdataset with the same class
- * as 'db'.
- *
- * 'newrdataset' is NULL, or a valid, unassociated rdataset.
- *
- * The database has zone semantics and 'version' is a valid
- * read-write version.
- *
- * Returns:
- *
- * ISC_R_SUCCESS
- * DNS_R_UNCHANGED The operation did not change anything.
- * DNS_R_NXRRSET All rdata of the same type as those
- * in 'rdataset' have been deleted.
- * DNS_R_NOTEXACT Some part of 'rdataset' did not
- * exist and DNS_DBSUB_EXACT was set.
- *
- * 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:
- *
- * 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:
- *
- * 'db' is a valid database.
- *
- * 'node' is a valid node.
- *
- * The database has zone semantics and 'version' is a valid
- * read-write version, or the database has cache semantics
- * and version is NULL.
- *
- * 'type' is not a meta-RR type, except for dns_rdatatype_any, which is
- * allowed.
- *
- * If 'covers' != 0, 'type' must be SIG.
- *
- * Returns:
- *
- * ISC_R_SUCCESS
- * DNS_R_UNCHANGED No rdatasets of 'type' existed before
- * the operation was attempted.
- *
- * 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:
- * 'db' is a valid database with zone semantics.
- * '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:
- *
- * 'db' is a valid database.
- *
- * Returns:
- * The number of nodes in the database
- */
- 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:
- *
- * 'db' is a valid database.
- *
- * Returns:
- * ISC_TRUE 'db' is persistent.
- * 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:
- *
- * 'name' is not NULL
- * 'order' is a valid function pointer
- * 'mctx' is a valid memory context
- * dbimp != NULL && *dbimp == NULL
- *
- * Returns:
- * ISC_R_SUCCESS The registration succeeded
- * ISC_R_NOMEMORY Out of memory
- * ISC_R_EXISTS A database implementation with the same name exists
- *
- * Ensures:
- *
- * *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:
- * dbimp != NULL && *dbimp == NULL
- *
- * Ensures:
- *
- * Any memory allocated in *dbimp will be freed.
- */
- ISC_LANG_ENDDECLS
- #endif /* DNS_DB_H */
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