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Diffstat (limited to '')
| -rw-r--r-- | lib/dns/db.c | 1121 |
1 files changed, 1121 insertions, 0 deletions
diff --git a/lib/dns/db.c b/lib/dns/db.c new file mode 100644 index 0000000..c95d19a --- /dev/null +++ b/lib/dns/db.c @@ -0,0 +1,1121 @@ +/* + * Copyright (C) Internet Systems Consortium, Inc. ("ISC") + * + * SPDX-License-Identifier: MPL-2.0 + * + * 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. + */ + +/*! \file */ + +/*** + *** Imports + ***/ + +#include <inttypes.h> +#include <stdbool.h> + +#include <isc/buffer.h> +#include <isc/mem.h> +#include <isc/once.h> +#include <isc/result.h> +#include <isc/rwlock.h> +#include <isc/string.h> +#include <isc/util.h> + +#include <dns/callbacks.h> +#include <dns/clientinfo.h> +#include <dns/db.h> +#include <dns/dbiterator.h> +#include <dns/log.h> +#include <dns/master.h> +#include <dns/rdata.h> +#include <dns/rdataset.h> +#include <dns/rdatasetiter.h> + +/*** + *** Private Types + ***/ + +struct dns_dbimplementation { + const char *name; + dns_dbcreatefunc_t create; + isc_mem_t *mctx; + void *driverarg; + ISC_LINK(dns_dbimplementation_t) link; +}; + +/*** + *** Supported DB Implementations Registry + ***/ + +/* + * Built in database implementations are registered here. + */ + +#include "rbtdb.h" + +unsigned int dns_pps = 0U; + +static ISC_LIST(dns_dbimplementation_t) implementations; +static isc_rwlock_t implock; +static isc_once_t once = ISC_ONCE_INIT; + +static dns_dbimplementation_t rbtimp; + +static void +initialize(void) { + isc_rwlock_init(&implock, 0, 0); + + rbtimp.name = "rbt"; + rbtimp.create = dns_rbtdb_create; + rbtimp.mctx = NULL; + rbtimp.driverarg = NULL; + ISC_LINK_INIT(&rbtimp, link); + + ISC_LIST_INIT(implementations); + ISC_LIST_APPEND(implementations, &rbtimp, link); +} + +static dns_dbimplementation_t * +impfind(const char *name) { + dns_dbimplementation_t *imp; + + for (imp = ISC_LIST_HEAD(implementations); imp != NULL; + imp = ISC_LIST_NEXT(imp, link)) + { + if (strcasecmp(name, imp->name) == 0) { + return (imp); + } + } + return (NULL); +} + +/*** + *** 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) { + dns_dbimplementation_t *impinfo; + + RUNTIME_CHECK(isc_once_do(&once, initialize) == ISC_R_SUCCESS); + + /* + * Create a new database using implementation 'db_type'. + */ + + REQUIRE(dbp != NULL && *dbp == NULL); + REQUIRE(dns_name_isabsolute(origin)); + + RWLOCK(&implock, isc_rwlocktype_read); + impinfo = impfind(db_type); + if (impinfo != NULL) { + isc_result_t result; + result = ((impinfo->create)(mctx, origin, type, rdclass, argc, + argv, impinfo->driverarg, dbp)); + RWUNLOCK(&implock, isc_rwlocktype_read); + return (result); + } + + RWUNLOCK(&implock, isc_rwlocktype_read); + + isc_log_write(dns_lctx, DNS_LOGCATEGORY_DATABASE, DNS_LOGMODULE_DB, + ISC_LOG_ERROR, "unsupported database type '%s'", db_type); + + return (ISC_R_NOTFOUND); +} + +void +dns_db_attach(dns_db_t *source, dns_db_t **targetp) { + /* + * Attach *targetp to source. + */ + + REQUIRE(DNS_DB_VALID(source)); + REQUIRE(targetp != NULL && *targetp == NULL); + + (source->methods->attach)(source, targetp); + + ENSURE(*targetp == source); +} + +void +dns_db_detach(dns_db_t **dbp) { + /* + * Detach *dbp from its database. + */ + + REQUIRE(dbp != NULL); + REQUIRE(DNS_DB_VALID(*dbp)); + + ((*dbp)->methods->detach)(dbp); + + ENSURE(*dbp == NULL); +} + +bool +dns_db_iscache(dns_db_t *db) { + /* + * Does 'db' have cache semantics? + */ + + REQUIRE(DNS_DB_VALID(db)); + + if ((db->attributes & DNS_DBATTR_CACHE) != 0) { + return (true); + } + + return (false); +} + +bool +dns_db_iszone(dns_db_t *db) { + /* + * Does 'db' have zone semantics? + */ + + REQUIRE(DNS_DB_VALID(db)); + + if ((db->attributes & (DNS_DBATTR_CACHE | DNS_DBATTR_STUB)) == 0) { + return (true); + } + + return (false); +} + +bool +dns_db_isstub(dns_db_t *db) { + /* + * Does 'db' have stub semantics? + */ + + REQUIRE(DNS_DB_VALID(db)); + + if ((db->attributes & DNS_DBATTR_STUB) != 0) { + return (true); + } + + return (false); +} + +bool +dns_db_isdnssec(dns_db_t *db) { + /* + * Is 'db' secure or partially secure? + */ + + REQUIRE(DNS_DB_VALID(db)); + REQUIRE((db->attributes & DNS_DBATTR_CACHE) == 0); + + if (db->methods->isdnssec != NULL) { + return ((db->methods->isdnssec)(db)); + } + return ((db->methods->issecure)(db)); +} + +bool +dns_db_issecure(dns_db_t *db) { + /* + * Is 'db' secure? + */ + + REQUIRE(DNS_DB_VALID(db)); + REQUIRE((db->attributes & DNS_DBATTR_CACHE) == 0); + + return ((db->methods->issecure)(db)); +} + +bool +dns_db_ispersistent(dns_db_t *db) { + /* + * Is 'db' persistent? + */ + + REQUIRE(DNS_DB_VALID(db)); + + return ((db->methods->ispersistent)(db)); +} + +dns_name_t * +dns_db_origin(dns_db_t *db) { + /* + * The origin of the database. + */ + + REQUIRE(DNS_DB_VALID(db)); + + return (&db->origin); +} + +dns_rdataclass_t +dns_db_class(dns_db_t *db) { + /* + * The class of the database. + */ + + REQUIRE(DNS_DB_VALID(db)); + + return (db->rdclass); +} + +isc_result_t +dns_db_beginload(dns_db_t *db, dns_rdatacallbacks_t *callbacks) { + /* + * Begin loading 'db'. + */ + + REQUIRE(DNS_DB_VALID(db)); + REQUIRE(DNS_CALLBACK_VALID(callbacks)); + + return ((db->methods->beginload)(db, callbacks)); +} + +isc_result_t +dns_db_endload(dns_db_t *db, dns_rdatacallbacks_t *callbacks) { + dns_dbonupdatelistener_t *listener; + + /* + * Finish loading 'db'. + */ + + REQUIRE(DNS_DB_VALID(db)); + REQUIRE(DNS_CALLBACK_VALID(callbacks)); + REQUIRE(callbacks->add_private != NULL); + + for (listener = ISC_LIST_HEAD(db->update_listeners); listener != NULL; + listener = ISC_LIST_NEXT(listener, link)) + { + listener->onupdate(db, listener->onupdate_arg); + } + + return ((db->methods->endload)(db, callbacks)); +} + +isc_result_t +dns_db_load(dns_db_t *db, const char *filename, dns_masterformat_t format, + unsigned int options) { + isc_result_t result, eresult; + dns_rdatacallbacks_t callbacks; + + /* + * Load master file 'filename' into 'db'. + */ + + REQUIRE(DNS_DB_VALID(db)); + + if ((db->attributes & DNS_DBATTR_CACHE) != 0) { + options |= DNS_MASTER_AGETTL; + } + + dns_rdatacallbacks_init(&callbacks); + result = dns_db_beginload(db, &callbacks); + if (result != ISC_R_SUCCESS) { + return (result); + } + result = dns_master_loadfile(filename, &db->origin, &db->origin, + db->rdclass, options, 0, &callbacks, NULL, + NULL, db->mctx, format, 0); + eresult = dns_db_endload(db, &callbacks); + /* + * We always call dns_db_endload(), but we only want to return its + * result if dns_master_loadfile() succeeded. If dns_master_loadfile() + * failed, we want to return the result code it gave us. + */ + if (eresult != ISC_R_SUCCESS && + (result == ISC_R_SUCCESS || result == DNS_R_SEENINCLUDE)) + { + result = eresult; + } + + return (result); +} + +isc_result_t +dns_db_dump(dns_db_t *db, dns_dbversion_t *version, const char *filename) { + return ((db->methods->dump)(db, version, filename, + dns_masterformat_text)); +} + +/*** + *** Version Methods + ***/ + +void +dns_db_currentversion(dns_db_t *db, dns_dbversion_t **versionp) { + /* + * Open the current version for reading. + */ + + REQUIRE(DNS_DB_VALID(db)); + REQUIRE((db->attributes & DNS_DBATTR_CACHE) == 0); + REQUIRE(versionp != NULL && *versionp == NULL); + + (db->methods->currentversion)(db, versionp); +} + +isc_result_t +dns_db_newversion(dns_db_t *db, dns_dbversion_t **versionp) { + /* + * Open a new version for reading and writing. + */ + + REQUIRE(DNS_DB_VALID(db)); + REQUIRE((db->attributes & DNS_DBATTR_CACHE) == 0); + REQUIRE(versionp != NULL && *versionp == NULL); + + return ((db->methods->newversion)(db, versionp)); +} + +void +dns_db_attachversion(dns_db_t *db, dns_dbversion_t *source, + dns_dbversion_t **targetp) { + /* + * Attach '*targetp' to 'source'. + */ + + REQUIRE(DNS_DB_VALID(db)); + REQUIRE((db->attributes & DNS_DBATTR_CACHE) == 0); + REQUIRE(source != NULL); + REQUIRE(targetp != NULL && *targetp == NULL); + + (db->methods->attachversion)(db, source, targetp); + + ENSURE(*targetp != NULL); +} + +void +dns_db_closeversion(dns_db_t *db, dns_dbversion_t **versionp, bool commit) { + dns_dbonupdatelistener_t *listener; + + /* + * Close version '*versionp'. + */ + + REQUIRE(DNS_DB_VALID(db)); + REQUIRE((db->attributes & DNS_DBATTR_CACHE) == 0); + REQUIRE(versionp != NULL && *versionp != NULL); + + (db->methods->closeversion)(db, versionp, commit); + + if (commit) { + for (listener = ISC_LIST_HEAD(db->update_listeners); + listener != NULL; listener = ISC_LIST_NEXT(listener, link)) + { + listener->onupdate(db, listener->onupdate_arg); + } + } + + ENSURE(*versionp == NULL); +} + +/*** + *** Node Methods + ***/ + +isc_result_t +dns_db_findnode(dns_db_t *db, const dns_name_t *name, bool create, + dns_dbnode_t **nodep) { + /* + * Find the node with name 'name'. + */ + + REQUIRE(DNS_DB_VALID(db)); + REQUIRE(nodep != NULL && *nodep == NULL); + + if (db->methods->findnode != NULL) { + return ((db->methods->findnode)(db, name, create, nodep)); + } else { + return ((db->methods->findnodeext)(db, name, create, NULL, NULL, + 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', passing 'arg' to the database + * implementation. + */ + + REQUIRE(DNS_DB_VALID(db)); + REQUIRE(nodep != NULL && *nodep == NULL); + + if (db->methods->findnodeext != NULL) { + return ((db->methods->findnodeext)(db, name, create, methods, + clientinfo, nodep)); + } else { + return ((db->methods->findnode)(db, name, create, nodep)); + } +} + +isc_result_t +dns_db_findnsec3node(dns_db_t *db, const dns_name_t *name, bool create, + dns_dbnode_t **nodep) { + /* + * Find the node with name 'name'. + */ + + REQUIRE(DNS_DB_VALID(db)); + REQUIRE(nodep != NULL && *nodep == NULL); + + return ((db->methods->findnsec3node)(db, name, create, nodep)); +} + +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) { + /* + * Find the best match for 'name' and 'type' in version 'version' + * of 'db'. + */ + + REQUIRE(DNS_DB_VALID(db)); + REQUIRE(type != dns_rdatatype_rrsig); + REQUIRE(nodep == NULL || *nodep == NULL); + REQUIRE(dns_name_hasbuffer(foundname)); + REQUIRE(rdataset == NULL || (DNS_RDATASET_VALID(rdataset) && + !dns_rdataset_isassociated(rdataset))); + REQUIRE(sigrdataset == NULL || + (DNS_RDATASET_VALID(sigrdataset) && + !dns_rdataset_isassociated(sigrdataset))); + + if (db->methods->find != NULL) { + return ((db->methods->find)(db, name, version, type, options, + now, nodep, foundname, rdataset, + sigrdataset)); + } else { + return ((db->methods->findext)(db, name, version, type, options, + now, nodep, foundname, NULL, + NULL, rdataset, 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', passing in 'arg'. + */ + + REQUIRE(DNS_DB_VALID(db)); + REQUIRE(type != dns_rdatatype_rrsig); + REQUIRE(nodep == NULL || *nodep == NULL); + REQUIRE(dns_name_hasbuffer(foundname)); + REQUIRE(rdataset == NULL || (DNS_RDATASET_VALID(rdataset) && + !dns_rdataset_isassociated(rdataset))); + REQUIRE(sigrdataset == NULL || + (DNS_RDATASET_VALID(sigrdataset) && + !dns_rdataset_isassociated(sigrdataset))); + + if (db->methods->findext != NULL) { + return ((db->methods->findext)( + db, name, version, type, options, now, nodep, foundname, + methods, clientinfo, rdataset, sigrdataset)); + } else { + return ((db->methods->find)(db, name, version, type, options, + now, nodep, foundname, rdataset, + sigrdataset)); + } +} + +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'. + * foundname is the zonecut, dcname is the deepest name we have + * in database that is part of queried name. + */ + + REQUIRE(DNS_DB_VALID(db)); + REQUIRE((db->attributes & DNS_DBATTR_CACHE) != 0); + REQUIRE(nodep == NULL || *nodep == NULL); + REQUIRE(dns_name_hasbuffer(foundname)); + REQUIRE(sigrdataset == NULL || + (DNS_RDATASET_VALID(sigrdataset) && + !dns_rdataset_isassociated(sigrdataset))); + + return ((db->methods->findzonecut)(db, name, options, now, nodep, + foundname, dcname, rdataset, + sigrdataset)); +} + +void +dns_db_attachnode(dns_db_t *db, dns_dbnode_t *source, dns_dbnode_t **targetp) { + /* + * Attach *targetp to source. + */ + + REQUIRE(DNS_DB_VALID(db)); + REQUIRE(source != NULL); + REQUIRE(targetp != NULL && *targetp == NULL); + + (db->methods->attachnode)(db, source, targetp); +} + +void +dns_db_detachnode(dns_db_t *db, dns_dbnode_t **nodep) { + /* + * Detach *nodep from its node. + */ + + REQUIRE(DNS_DB_VALID(db)); + REQUIRE(nodep != NULL && *nodep != NULL); + + (db->methods->detachnode)(db, nodep); + + ENSURE(*nodep == NULL); +} + +void +dns_db_transfernode(dns_db_t *db, dns_dbnode_t **sourcep, + dns_dbnode_t **targetp) { + REQUIRE(DNS_DB_VALID(db)); + REQUIRE(targetp != NULL && *targetp == NULL); + /* + * This doesn't check the implementation magic. If we find that + * we need such checks in future then this will be done in the + * method. + */ + REQUIRE(sourcep != NULL && *sourcep != NULL); + + UNUSED(db); + + if (db->methods->transfernode == NULL) { + *targetp = *sourcep; + *sourcep = NULL; + } else { + (db->methods->transfernode)(db, sourcep, targetp); + } + + ENSURE(*sourcep == 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'. + */ + + REQUIRE(DNS_DB_VALID(db)); + REQUIRE((db->attributes & DNS_DBATTR_CACHE) != 0); + REQUIRE(node != NULL); + + return ((db->methods->expirenode)(db, node, now)); +} + +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'. + */ + + REQUIRE(DNS_DB_VALID(db)); + REQUIRE(node != NULL); + + (db->methods->printnode)(db, node, out); +} + +/*** + *** DB Iterator Creation + ***/ + +isc_result_t +dns_db_createiterator(dns_db_t *db, unsigned int flags, + dns_dbiterator_t **iteratorp) { + /* + * Create an iterator for version 'version' of 'db'. + */ + + REQUIRE(DNS_DB_VALID(db)); + REQUIRE(iteratorp != NULL && *iteratorp == NULL); + + return (db->methods->createiterator(db, flags, iteratorp)); +} + +/*** + *** Rdataset Methods + ***/ + +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) { + REQUIRE(DNS_DB_VALID(db)); + REQUIRE(node != NULL); + REQUIRE(DNS_RDATASET_VALID(rdataset)); + REQUIRE(!dns_rdataset_isassociated(rdataset)); + REQUIRE(covers == 0 || type == dns_rdatatype_rrsig); + REQUIRE(type != dns_rdatatype_any); + REQUIRE(sigrdataset == NULL || + (DNS_RDATASET_VALID(sigrdataset) && + !dns_rdataset_isassociated(sigrdataset))); + + return ((db->methods->findrdataset)(db, node, version, type, covers, + now, rdataset, sigrdataset)); +} + +isc_result_t +dns_db_allrdatasets(dns_db_t *db, dns_dbnode_t *node, dns_dbversion_t *version, + unsigned int options, isc_stdtime_t now, + dns_rdatasetiter_t **iteratorp) { + /* + * Make '*iteratorp' an rdataset iteratator for all rdatasets at + * 'node' in version 'version' of 'db'. + */ + + REQUIRE(DNS_DB_VALID(db)); + REQUIRE(iteratorp != NULL && *iteratorp == NULL); + + return ((db->methods->allrdatasets)(db, node, version, options, now, + iteratorp)); +} + +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'. + */ + + REQUIRE(DNS_DB_VALID(db)); + REQUIRE(node != NULL); + REQUIRE(((db->attributes & DNS_DBATTR_CACHE) == 0 && version != NULL) || + ((db->attributes & DNS_DBATTR_CACHE) != 0 && version == NULL && + (options & DNS_DBADD_MERGE) == 0)); + REQUIRE((options & DNS_DBADD_EXACT) == 0 || + (options & DNS_DBADD_MERGE) != 0); + REQUIRE(DNS_RDATASET_VALID(rdataset)); + REQUIRE(dns_rdataset_isassociated(rdataset)); + REQUIRE(rdataset->rdclass == db->rdclass); + REQUIRE(addedrdataset == NULL || + (DNS_RDATASET_VALID(addedrdataset) && + !dns_rdataset_isassociated(addedrdataset))); + + return ((db->methods->addrdataset)(db, node, version, now, rdataset, + options, addedrdataset)); +} + +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'. + */ + + REQUIRE(DNS_DB_VALID(db)); + REQUIRE(node != NULL); + REQUIRE((db->attributes & DNS_DBATTR_CACHE) == 0 && version != NULL); + REQUIRE(DNS_RDATASET_VALID(rdataset)); + REQUIRE(dns_rdataset_isassociated(rdataset)); + REQUIRE(rdataset->rdclass == db->rdclass); + REQUIRE(newrdataset == NULL || + (DNS_RDATASET_VALID(newrdataset) && + !dns_rdataset_isassociated(newrdataset))); + + return ((db->methods->subtractrdataset)(db, node, version, rdataset, + options, newrdataset)); +} + +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'. + */ + + REQUIRE(DNS_DB_VALID(db)); + REQUIRE(node != NULL); + REQUIRE(((db->attributes & DNS_DBATTR_CACHE) == 0 && version != NULL) || + ((db->attributes & DNS_DBATTR_CACHE) != 0 && version == NULL)); + + return ((db->methods->deleterdataset)(db, node, version, type, covers)); +} + +void +dns_db_overmem(dns_db_t *db, bool overmem) { + REQUIRE(DNS_DB_VALID(db)); + + (db->methods->overmem)(db, overmem); +} + +isc_result_t +dns_db_getsoaserial(dns_db_t *db, dns_dbversion_t *ver, uint32_t *serialp) { + isc_result_t result; + dns_dbnode_t *node = NULL; + dns_rdataset_t rdataset; + dns_rdata_t rdata = DNS_RDATA_INIT; + isc_buffer_t buffer; + + REQUIRE(dns_db_iszone(db) || dns_db_isstub(db)); + + result = dns_db_findnode(db, dns_db_origin(db), false, &node); + if (result != ISC_R_SUCCESS) { + return (result); + } + + dns_rdataset_init(&rdataset); + result = dns_db_findrdataset(db, node, ver, dns_rdatatype_soa, 0, + (isc_stdtime_t)0, &rdataset, NULL); + if (result != ISC_R_SUCCESS) { + goto freenode; + } + + result = dns_rdataset_first(&rdataset); + if (result != ISC_R_SUCCESS) { + goto freerdataset; + } + dns_rdataset_current(&rdataset, &rdata); + result = dns_rdataset_next(&rdataset); + INSIST(result == ISC_R_NOMORE); + + INSIST(rdata.length > 20); + isc_buffer_init(&buffer, rdata.data, rdata.length); + isc_buffer_add(&buffer, rdata.length); + isc_buffer_forward(&buffer, rdata.length - 20); + *serialp = isc_buffer_getuint32(&buffer); + + result = ISC_R_SUCCESS; + +freerdataset: + dns_rdataset_disassociate(&rdataset); + +freenode: + dns_db_detachnode(db, &node); + return (result); +} + +unsigned int +dns_db_nodecount(dns_db_t *db, dns_dbtree_t tree) { + REQUIRE(DNS_DB_VALID(db)); + + return ((db->methods->nodecount)(db, tree)); +} + +size_t +dns_db_hashsize(dns_db_t *db) { + REQUIRE(DNS_DB_VALID(db)); + + if (db->methods->hashsize == NULL) { + return (0); + } + + return ((db->methods->hashsize)(db)); +} + +void +dns_db_settask(dns_db_t *db, isc_task_t *task) { + REQUIRE(DNS_DB_VALID(db)); + + (db->methods->settask)(db, task); +} + +isc_result_t +dns_db_register(const char *name, dns_dbcreatefunc_t create, void *driverarg, + isc_mem_t *mctx, dns_dbimplementation_t **dbimp) { + dns_dbimplementation_t *imp; + + REQUIRE(name != NULL); + REQUIRE(dbimp != NULL && *dbimp == NULL); + + RUNTIME_CHECK(isc_once_do(&once, initialize) == ISC_R_SUCCESS); + + RWLOCK(&implock, isc_rwlocktype_write); + imp = impfind(name); + if (imp != NULL) { + RWUNLOCK(&implock, isc_rwlocktype_write); + return (ISC_R_EXISTS); + } + + imp = isc_mem_get(mctx, sizeof(dns_dbimplementation_t)); + imp->name = name; + imp->create = create; + imp->mctx = NULL; + imp->driverarg = driverarg; + isc_mem_attach(mctx, &imp->mctx); + ISC_LINK_INIT(imp, link); + ISC_LIST_APPEND(implementations, imp, link); + RWUNLOCK(&implock, isc_rwlocktype_write); + + *dbimp = imp; + + return (ISC_R_SUCCESS); +} + +void +dns_db_unregister(dns_dbimplementation_t **dbimp) { + dns_dbimplementation_t *imp; + + REQUIRE(dbimp != NULL && *dbimp != NULL); + + RUNTIME_CHECK(isc_once_do(&once, initialize) == ISC_R_SUCCESS); + + imp = *dbimp; + *dbimp = NULL; + RWLOCK(&implock, isc_rwlocktype_write); + ISC_LIST_UNLINK(implementations, imp, link); + isc_mem_putanddetach(&imp->mctx, imp, sizeof(dns_dbimplementation_t)); + RWUNLOCK(&implock, isc_rwlocktype_write); + ENSURE(*dbimp == NULL); +} + +isc_result_t +dns_db_getoriginnode(dns_db_t *db, dns_dbnode_t **nodep) { + REQUIRE(DNS_DB_VALID(db)); + REQUIRE(dns_db_iszone(db)); + REQUIRE(nodep != NULL && *nodep == NULL); + + if (db->methods->getoriginnode != NULL) { + return ((db->methods->getoriginnode)(db, nodep)); + } + + return (ISC_R_NOTFOUND); +} + +dns_stats_t * +dns_db_getrrsetstats(dns_db_t *db) { + REQUIRE(DNS_DB_VALID(db)); + + if (db->methods->getrrsetstats != NULL) { + return ((db->methods->getrrsetstats)(db)); + } + + return (NULL); +} + +isc_result_t +dns_db_setcachestats(dns_db_t *db, isc_stats_t *stats) { + REQUIRE(DNS_DB_VALID(db)); + + if (db->methods->setcachestats != NULL) { + return ((db->methods->setcachestats)(db, stats)); + } + + return (ISC_R_NOTIMPLEMENTED); +} + +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) { + REQUIRE(DNS_DB_VALID(db)); + REQUIRE(dns_db_iszone(db)); + + if (db->methods->getnsec3parameters != NULL) { + return ((db->methods->getnsec3parameters)(db, version, hash, + flags, iterations, + salt, salt_length)); + } + + return (ISC_R_NOTFOUND); +} + +isc_result_t +dns_db_getsize(dns_db_t *db, dns_dbversion_t *version, uint64_t *records, + uint64_t *bytes) { + REQUIRE(DNS_DB_VALID(db)); + REQUIRE(dns_db_iszone(db)); + + if (db->methods->getsize != NULL) { + return ((db->methods->getsize)(db, version, records, bytes)); + } + + return (ISC_R_NOTFOUND); +} + +isc_result_t +dns_db_setsigningtime(dns_db_t *db, dns_rdataset_t *rdataset, + isc_stdtime_t resign) { + if (db->methods->setsigningtime != NULL) { + return ((db->methods->setsigningtime)(db, rdataset, resign)); + } + return (ISC_R_NOTIMPLEMENTED); +} + +isc_result_t +dns_db_getsigningtime(dns_db_t *db, dns_rdataset_t *rdataset, + dns_name_t *name) { + if (db->methods->getsigningtime != NULL) { + return ((db->methods->getsigningtime)(db, rdataset, name)); + } + return (ISC_R_NOTFOUND); +} + +void +dns_db_resigned(dns_db_t *db, dns_rdataset_t *rdataset, + dns_dbversion_t *version) { + if (db->methods->resigned != NULL) { + (db->methods->resigned)(db, rdataset, version); + } +} + +/* + * Attach a database to policy zone databases. + * This should only happen when the caller has already ensured that + * it is dealing with a database that understands response policy zones. + */ +void +dns_db_rpz_attach(dns_db_t *db, void *rpzs, uint8_t rpz_num) { + REQUIRE(db->methods->rpz_attach != NULL); + (db->methods->rpz_attach)(db, rpzs, rpz_num); +} + +/* + * Finish loading a response policy zone. + */ +isc_result_t +dns_db_rpz_ready(dns_db_t *db) { + if (db->methods->rpz_ready == NULL) { + return (ISC_R_SUCCESS); + } + return ((db->methods->rpz_ready)(db)); +} + +/* + * Attach a notify-on-update function the database + */ +isc_result_t +dns_db_updatenotify_register(dns_db_t *db, dns_dbupdate_callback_t fn, + void *fn_arg) { + dns_dbonupdatelistener_t *listener; + + REQUIRE(db != NULL); + REQUIRE(fn != NULL); + + for (listener = ISC_LIST_HEAD(db->update_listeners); listener != NULL; + listener = ISC_LIST_NEXT(listener, link)) + { + if ((listener->onupdate == fn) && + (listener->onupdate_arg == fn_arg)) + { + return (ISC_R_SUCCESS); + } + } + + listener = isc_mem_get(db->mctx, sizeof(dns_dbonupdatelistener_t)); + + listener->onupdate = fn; + listener->onupdate_arg = fn_arg; + + ISC_LINK_INIT(listener, link); + ISC_LIST_APPEND(db->update_listeners, listener, link); + + return (ISC_R_SUCCESS); +} + +isc_result_t +dns_db_updatenotify_unregister(dns_db_t *db, dns_dbupdate_callback_t fn, + void *fn_arg) { + dns_dbonupdatelistener_t *listener; + + REQUIRE(db != NULL); + + for (listener = ISC_LIST_HEAD(db->update_listeners); listener != NULL; + listener = ISC_LIST_NEXT(listener, link)) + { + if ((listener->onupdate == fn) && + (listener->onupdate_arg == fn_arg)) + { + ISC_LIST_UNLINK(db->update_listeners, listener, link); + isc_mem_put(db->mctx, listener, + sizeof(dns_dbonupdatelistener_t)); + return (ISC_R_SUCCESS); + } + } + + return (ISC_R_NOTFOUND); +} + +isc_result_t +dns_db_nodefullname(dns_db_t *db, dns_dbnode_t *node, dns_name_t *name) { + REQUIRE(db != NULL); + REQUIRE(node != NULL); + REQUIRE(name != NULL); + + if (db->methods->nodefullname == NULL) { + return (ISC_R_NOTIMPLEMENTED); + } + return ((db->methods->nodefullname)(db, node, name)); +} + +isc_result_t +dns_db_setservestalettl(dns_db_t *db, dns_ttl_t ttl) { + REQUIRE(DNS_DB_VALID(db)); + REQUIRE((db->attributes & DNS_DBATTR_CACHE) != 0); + + if (db->methods->setservestalettl != NULL) { + return ((db->methods->setservestalettl)(db, ttl)); + } + return (ISC_R_NOTIMPLEMENTED); +} + +isc_result_t +dns_db_getservestalettl(dns_db_t *db, dns_ttl_t *ttl) { + REQUIRE(DNS_DB_VALID(db)); + REQUIRE((db->attributes & DNS_DBATTR_CACHE) != 0); + + if (db->methods->getservestalettl != NULL) { + return ((db->methods->getservestalettl)(db, ttl)); + } + return (ISC_R_NOTIMPLEMENTED); +} + +isc_result_t +dns_db_setservestalerefresh(dns_db_t *db, uint32_t interval) { + REQUIRE(DNS_DB_VALID(db)); + REQUIRE((db->attributes & DNS_DBATTR_CACHE) != 0); + + if (db->methods->setservestalerefresh != NULL) { + return ((db->methods->setservestalerefresh)(db, interval)); + } + return (ISC_R_NOTIMPLEMENTED); +} + +isc_result_t +dns_db_getservestalerefresh(dns_db_t *db, uint32_t *interval) { + REQUIRE(DNS_DB_VALID(db)); + REQUIRE((db->attributes & DNS_DBATTR_CACHE) != 0); + + if (db->methods->getservestalerefresh != NULL) { + return ((db->methods->getservestalerefresh)(db, interval)); + } + return (ISC_R_NOTIMPLEMENTED); +} + +isc_result_t +dns_db_setgluecachestats(dns_db_t *db, isc_stats_t *stats) { + REQUIRE(dns_db_iszone(db)); + REQUIRE(stats != NULL); + + if (db->methods->setgluecachestats != NULL) { + return ((db->methods->setgluecachestats)(db, stats)); + } + + return (ISC_R_NOTIMPLEMENTED); +} |