diff options
Diffstat (limited to 'contrib/bind9/lib/dns/rbtdb.c')
| -rw-r--r-- | contrib/bind9/lib/dns/rbtdb.c | 5723 |
1 files changed, 0 insertions, 5723 deletions
diff --git a/contrib/bind9/lib/dns/rbtdb.c b/contrib/bind9/lib/dns/rbtdb.c deleted file mode 100644 index f399dd17bcea..000000000000 --- a/contrib/bind9/lib/dns/rbtdb.c +++ /dev/null @@ -1,5723 +0,0 @@ -/* - * Copyright (C) 2004, 2005 Internet Systems Consortium, Inc. ("ISC") - * Copyright (C) 1999-2003 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 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: rbtdb.c,v 1.168.2.11.2.22 2005/10/14 01:38:48 marka Exp $ */ - -/* - * Principal Author: Bob Halley - */ - -#include <config.h> - -#include <isc/event.h> -#include <isc/mem.h> -#include <isc/print.h> -#include <isc/mutex.h> -#include <isc/random.h> -#include <isc/refcount.h> -#include <isc/rwlock.h> -#include <isc/string.h> -#include <isc/task.h> -#include <isc/util.h> - -#include <dns/db.h> -#include <dns/dbiterator.h> -#include <dns/events.h> -#include <dns/fixedname.h> -#include <dns/log.h> -#include <dns/masterdump.h> -#include <dns/rbt.h> -#include <dns/rdata.h> -#include <dns/rdataset.h> -#include <dns/rdatasetiter.h> -#include <dns/rdataslab.h> -#include <dns/result.h> -#include <dns/zonekey.h> - -#ifdef DNS_RBTDB_VERSION64 -#include "rbtdb64.h" -#else -#include "rbtdb.h" -#endif - -#ifdef DNS_RBTDB_VERSION64 -#define RBTDB_MAGIC ISC_MAGIC('R', 'B', 'D', '8') -#else -#define RBTDB_MAGIC ISC_MAGIC('R', 'B', 'D', '4') -#endif - -/* - * Note that "impmagic" is not the first four bytes of the struct, so - * ISC_MAGIC_VALID cannot be used. - */ -#define VALID_RBTDB(rbtdb) ((rbtdb) != NULL && \ - (rbtdb)->common.impmagic == RBTDB_MAGIC) - -#ifdef DNS_RBTDB_VERSION64 -typedef isc_uint64_t rbtdb_serial_t; -/* - * Make casting easier in symbolic debuggers by using different names - * for the 64 bit version. - */ -#define dns_rbtdb_t dns_rbtdb64_t -#define rdatasetheader_t rdatasetheader64_t -#define rbtdb_version_t rbtdb_version64_t -#else -typedef isc_uint32_t rbtdb_serial_t; -#endif - -typedef isc_uint32_t rbtdb_rdatatype_t; - -#define RBTDB_RDATATYPE_BASE(type) ((dns_rdatatype_t)((type) & 0xFFFF)) -#define RBTDB_RDATATYPE_EXT(type) ((dns_rdatatype_t)((type) >> 16)) -#define RBTDB_RDATATYPE_VALUE(b, e) (((e) << 16) | (b)) - -#define RBTDB_RDATATYPE_SIGNSEC \ - RBTDB_RDATATYPE_VALUE(dns_rdatatype_rrsig, dns_rdatatype_nsec) -#define RBTDB_RDATATYPE_SIGNS \ - RBTDB_RDATATYPE_VALUE(dns_rdatatype_rrsig, dns_rdatatype_ns) -#define RBTDB_RDATATYPE_SIGCNAME \ - RBTDB_RDATATYPE_VALUE(dns_rdatatype_rrsig, dns_rdatatype_cname) -#define RBTDB_RDATATYPE_SIGDNAME \ - RBTDB_RDATATYPE_VALUE(dns_rdatatype_rrsig, dns_rdatatype_dname) -#define RBTDB_RDATATYPE_NCACHEANY \ - RBTDB_RDATATYPE_VALUE(0, dns_rdatatype_any) - -/* - * Allow clients with a virtual time of upto 5 minutes in the past to see - * records that would have otherwise have expired. - */ -#define RBTDB_VIRTUAL 300 - -struct noqname { - dns_name_t name; - void * nsec; - void * nsecsig; -}; - -typedef struct rdatasetheader { - /* - * Locked by the owning node's lock. - */ - rbtdb_serial_t serial; - dns_ttl_t ttl; - rbtdb_rdatatype_t type; - isc_uint16_t attributes; - dns_trust_t trust; - struct noqname *noqname; - /* - * We don't use the LIST macros, because the LIST structure has - * both head and tail pointers, and is doubly linked. - */ - - struct rdatasetheader *next; - /* - * If this is the top header for an rdataset, 'next' points - * to the top header for the next rdataset (i.e., the next type). - * Otherwise, it points up to the header whose down pointer points - * at this header. - */ - - struct rdatasetheader *down; - /* - * Points to the header for the next older version of - * this rdataset. - */ - - isc_uint32_t count; - /* - * Monotonously increased every time this rdataset is bound so that - * it is used as the base of the starting point in DNS responses - * when the "cyclic" rrset-order is required. Since the ordering - * should not be so crucial, no lock is set for the counter for - * performance reasons. - */ -} rdatasetheader_t; - -#define RDATASET_ATTR_NONEXISTENT 0x0001 -#define RDATASET_ATTR_STALE 0x0002 -#define RDATASET_ATTR_IGNORE 0x0004 -#define RDATASET_ATTR_RETAIN 0x0008 -#define RDATASET_ATTR_NXDOMAIN 0x0010 - -/* - * XXX - * When the cache will pre-expire data (due to memory low or other - * situations) before the rdataset's TTL has expired, it MUST - * respect the RETAIN bit and not expire the data until its TTL is - * expired. - */ - -#undef IGNORE /* WIN32 winbase.h defines this. */ - -#define EXISTS(header) \ - (((header)->attributes & RDATASET_ATTR_NONEXISTENT) == 0) -#define NONEXISTENT(header) \ - (((header)->attributes & RDATASET_ATTR_NONEXISTENT) != 0) -#define IGNORE(header) \ - (((header)->attributes & RDATASET_ATTR_IGNORE) != 0) -#define RETAIN(header) \ - (((header)->attributes & RDATASET_ATTR_RETAIN) != 0) -#define NXDOMAIN(header) \ - (((header)->attributes & RDATASET_ATTR_NXDOMAIN) != 0) - -#define DEFAULT_NODE_LOCK_COUNT 7 /* Should be prime. */ - -typedef struct { - isc_mutex_t lock; - /* Locked by lock. */ - unsigned int references; - isc_boolean_t exiting; -} rbtdb_nodelock_t; - -typedef struct rbtdb_changed { - dns_rbtnode_t * node; - isc_boolean_t dirty; - ISC_LINK(struct rbtdb_changed) link; -} rbtdb_changed_t; - -typedef ISC_LIST(rbtdb_changed_t) rbtdb_changedlist_t; - -typedef struct rbtdb_version { - /* Not locked */ - rbtdb_serial_t serial; - /* Locked by database lock. */ - isc_boolean_t writer; - unsigned int references; - isc_boolean_t commit_ok; - rbtdb_changedlist_t changed_list; - ISC_LINK(struct rbtdb_version) link; -} rbtdb_version_t; - -typedef ISC_LIST(rbtdb_version_t) rbtdb_versionlist_t; - -typedef struct { - /* Unlocked. */ - dns_db_t common; - isc_mutex_t lock; - isc_rwlock_t tree_lock; - unsigned int node_lock_count; - rbtdb_nodelock_t * node_locks; - dns_rbtnode_t * origin_node; - /* Locked by lock. */ - unsigned int active; - isc_refcount_t references; - unsigned int attributes; - rbtdb_serial_t current_serial; - rbtdb_serial_t least_serial; - rbtdb_serial_t next_serial; - rbtdb_version_t * current_version; - rbtdb_version_t * future_version; - rbtdb_versionlist_t open_versions; - isc_boolean_t overmem; - isc_task_t * task; - /* Locked by tree_lock. */ - dns_rbt_t * tree; - isc_boolean_t secure; -} dns_rbtdb_t; - -#define RBTDB_ATTR_LOADED 0x01 -#define RBTDB_ATTR_LOADING 0x02 - -/* - * Search Context - */ -typedef struct { - dns_rbtdb_t * rbtdb; - rbtdb_version_t * rbtversion; - rbtdb_serial_t serial; - unsigned int options; - dns_rbtnodechain_t chain; - isc_boolean_t copy_name; - isc_boolean_t need_cleanup; - isc_boolean_t wild; - dns_rbtnode_t * zonecut; - rdatasetheader_t * zonecut_rdataset; - rdatasetheader_t * zonecut_sigrdataset; - dns_fixedname_t zonecut_name; - isc_stdtime_t now; -} rbtdb_search_t; - -/* - * Load Context - */ -typedef struct { - dns_rbtdb_t * rbtdb; - isc_stdtime_t now; -} rbtdb_load_t; - -static void rdataset_disassociate(dns_rdataset_t *rdataset); -static isc_result_t rdataset_first(dns_rdataset_t *rdataset); -static isc_result_t rdataset_next(dns_rdataset_t *rdataset); -static void rdataset_current(dns_rdataset_t *rdataset, dns_rdata_t *rdata); -static void rdataset_clone(dns_rdataset_t *source, dns_rdataset_t *target); -static unsigned int rdataset_count(dns_rdataset_t *rdataset); -static isc_result_t rdataset_getnoqname(dns_rdataset_t *rdataset, - dns_name_t *name, - dns_rdataset_t *nsec, - dns_rdataset_t *nsecsig); - -static dns_rdatasetmethods_t rdataset_methods = { - rdataset_disassociate, - rdataset_first, - rdataset_next, - rdataset_current, - rdataset_clone, - rdataset_count, - NULL, - rdataset_getnoqname -}; - -static void rdatasetiter_destroy(dns_rdatasetiter_t **iteratorp); -static isc_result_t rdatasetiter_first(dns_rdatasetiter_t *iterator); -static isc_result_t rdatasetiter_next(dns_rdatasetiter_t *iterator); -static void rdatasetiter_current(dns_rdatasetiter_t *iterator, - dns_rdataset_t *rdataset); - -static dns_rdatasetitermethods_t rdatasetiter_methods = { - rdatasetiter_destroy, - rdatasetiter_first, - rdatasetiter_next, - rdatasetiter_current -}; - -typedef struct rbtdb_rdatasetiter { - dns_rdatasetiter_t common; - rdatasetheader_t * current; -} rbtdb_rdatasetiter_t; - -static void dbiterator_destroy(dns_dbiterator_t **iteratorp); -static isc_result_t dbiterator_first(dns_dbiterator_t *iterator); -static isc_result_t dbiterator_last(dns_dbiterator_t *iterator); -static isc_result_t dbiterator_seek(dns_dbiterator_t *iterator, - dns_name_t *name); -static isc_result_t dbiterator_prev(dns_dbiterator_t *iterator); -static isc_result_t dbiterator_next(dns_dbiterator_t *iterator); -static isc_result_t dbiterator_current(dns_dbiterator_t *iterator, - dns_dbnode_t **nodep, - dns_name_t *name); -static isc_result_t dbiterator_pause(dns_dbiterator_t *iterator); -static isc_result_t dbiterator_origin(dns_dbiterator_t *iterator, - dns_name_t *name); - -static dns_dbiteratormethods_t dbiterator_methods = { - dbiterator_destroy, - dbiterator_first, - dbiterator_last, - dbiterator_seek, - dbiterator_prev, - dbiterator_next, - dbiterator_current, - dbiterator_pause, - dbiterator_origin -}; - -#define DELETION_BATCH_MAX 64 - -/* - * If 'paused' is ISC_TRUE, then the tree lock is not being held. - */ -typedef struct rbtdb_dbiterator { - dns_dbiterator_t common; - isc_boolean_t paused; - isc_boolean_t new_origin; - isc_rwlocktype_t tree_locked; - isc_result_t result; - dns_fixedname_t name; - dns_fixedname_t origin; - dns_rbtnodechain_t chain; - dns_rbtnode_t *node; - dns_rbtnode_t *deletions[DELETION_BATCH_MAX]; - int delete; -} rbtdb_dbiterator_t; - - -#define IS_STUB(rbtdb) (((rbtdb)->common.attributes & DNS_DBATTR_STUB) != 0) -#define IS_CACHE(rbtdb) (((rbtdb)->common.attributes & DNS_DBATTR_CACHE) != 0) - -static void free_rbtdb(dns_rbtdb_t *rbtdb, isc_boolean_t log, - isc_event_t *event); - -/* - * Locking - * - * If a routine is going to lock more than one lock in this module, then - * the locking must be done in the following order: - * - * Tree Lock - * - * Node Lock (Only one from the set may be locked at one time by - * any caller) - * - * Database Lock - * - * Failure to follow this hierarchy can result in deadlock. - */ - -/* - * Deleting Nodes - * - * Currently there is no deletion of nodes from the database, except when - * the database is being destroyed. - * - * If node deletion is added in the future, then for zone databases the node - * for the origin of the zone MUST NOT be deleted. - */ - - -/* - * DB Routines - */ - -static void -attach(dns_db_t *source, dns_db_t **targetp) { - dns_rbtdb_t *rbtdb = (dns_rbtdb_t *)source; - - REQUIRE(VALID_RBTDB(rbtdb)); - - isc_refcount_increment(&rbtdb->references, NULL); - - *targetp = source; -} - -static void -free_rbtdb_callback(isc_task_t *task, isc_event_t *event) { - dns_rbtdb_t *rbtdb = event->ev_arg; - - UNUSED(task); - - free_rbtdb(rbtdb, ISC_TRUE, event); -} - -static void -free_rbtdb(dns_rbtdb_t *rbtdb, isc_boolean_t log, isc_event_t *event) { - unsigned int i; - isc_ondestroy_t ondest; - isc_result_t result; - char buf[DNS_NAME_FORMATSIZE]; - - REQUIRE(EMPTY(rbtdb->open_versions)); - REQUIRE(rbtdb->future_version == NULL); - - if (rbtdb->current_version != NULL) - isc_mem_put(rbtdb->common.mctx, rbtdb->current_version, - sizeof(rbtdb_version_t)); - again: - if (rbtdb->tree != NULL) { - result = dns_rbt_destroy2(&rbtdb->tree, - (rbtdb->task != NULL) ? 1000 : 0); - if (result == ISC_R_QUOTA) { - INSIST(rbtdb->task != NULL); - if (event == NULL) - event = isc_event_allocate(rbtdb->common.mctx, - NULL, - DNS_EVENT_FREESTORAGE, - free_rbtdb_callback, - rbtdb, - sizeof(isc_event_t)); - if (event == NULL) - goto again; - isc_task_send(rbtdb->task, &event); - return; - } - INSIST(result == ISC_R_SUCCESS && rbtdb->tree == NULL); - } - if (event != NULL) - isc_event_free(&event); - if (log) { - if (dns_name_dynamic(&rbtdb->common.origin)) - dns_name_format(&rbtdb->common.origin, buf, - sizeof(buf)); - else - strcpy(buf, "<UNKNOWN>"); - isc_log_write(dns_lctx, DNS_LOGCATEGORY_DATABASE, - DNS_LOGMODULE_CACHE, ISC_LOG_DEBUG(1), - "done free_rbtdb(%s)", buf); - } - if (dns_name_dynamic(&rbtdb->common.origin)) - dns_name_free(&rbtdb->common.origin, rbtdb->common.mctx); - for (i = 0; i < rbtdb->node_lock_count; i++) - DESTROYLOCK(&rbtdb->node_locks[i].lock); - isc_mem_put(rbtdb->common.mctx, rbtdb->node_locks, - rbtdb->node_lock_count * sizeof(rbtdb_nodelock_t)); - isc_rwlock_destroy(&rbtdb->tree_lock); - isc_refcount_destroy(&rbtdb->references); - if (rbtdb->task != NULL) - isc_task_detach(&rbtdb->task); - DESTROYLOCK(&rbtdb->lock); - rbtdb->common.magic = 0; - rbtdb->common.impmagic = 0; - ondest = rbtdb->common.ondest; - isc_mem_putanddetach(&rbtdb->common.mctx, rbtdb, sizeof(*rbtdb)); - isc_ondestroy_notify(&ondest, rbtdb); -} - -static inline void -maybe_free_rbtdb(dns_rbtdb_t *rbtdb) { - isc_boolean_t want_free = ISC_FALSE; - unsigned int i; - unsigned int inactive = 0; - - /* XXX check for open versions here */ - - /* - * Even though there are no external direct references, there still - * may be nodes in use. - */ - for (i = 0; i < rbtdb->node_lock_count; i++) { - LOCK(&rbtdb->node_locks[i].lock); - rbtdb->node_locks[i].exiting = ISC_TRUE; - if (rbtdb->node_locks[i].references == 0) - inactive++; - UNLOCK(&rbtdb->node_locks[i].lock); - } - - if (inactive != 0) { - LOCK(&rbtdb->lock); - rbtdb->active -= inactive; - if (rbtdb->active == 0) - want_free = ISC_TRUE; - UNLOCK(&rbtdb->lock); - if (want_free) { - char buf[DNS_NAME_FORMATSIZE]; - if (dns_name_dynamic(&rbtdb->common.origin)) - dns_name_format(&rbtdb->common.origin, buf, - sizeof(buf)); - else - strcpy(buf, "<UNKNOWN>"); - isc_log_write(dns_lctx, DNS_LOGCATEGORY_DATABASE, - DNS_LOGMODULE_CACHE, ISC_LOG_DEBUG(1), - "calling free_rbtdb(%s)", buf); - free_rbtdb(rbtdb, ISC_TRUE, NULL); - } - } -} - -static void -detach(dns_db_t **dbp) { - dns_rbtdb_t *rbtdb = (dns_rbtdb_t *)(*dbp); - unsigned int refs; - - REQUIRE(VALID_RBTDB(rbtdb)); - - isc_refcount_decrement(&rbtdb->references, &refs); - - if (refs == 0) - maybe_free_rbtdb(rbtdb); - - *dbp = NULL; -} - -static void -currentversion(dns_db_t *db, dns_dbversion_t **versionp) { - dns_rbtdb_t *rbtdb = (dns_rbtdb_t *)db; - rbtdb_version_t *version; - - REQUIRE(VALID_RBTDB(rbtdb)); - - LOCK(&rbtdb->lock); - version = rbtdb->current_version; - if (version->references == 0) - PREPEND(rbtdb->open_versions, version, link); - version->references++; - UNLOCK(&rbtdb->lock); - - *versionp = (dns_dbversion_t *)version; -} - -static inline rbtdb_version_t * -allocate_version(isc_mem_t *mctx, rbtdb_serial_t serial, - unsigned int references, isc_boolean_t writer) -{ - rbtdb_version_t *version; - - version = isc_mem_get(mctx, sizeof(*version)); - if (version == NULL) - return (NULL); - version->serial = serial; - version->references = references; - version->writer = writer; - version->commit_ok = ISC_FALSE; - ISC_LIST_INIT(version->changed_list); - ISC_LINK_INIT(version, link); - - return (version); -} - -static isc_result_t -newversion(dns_db_t *db, dns_dbversion_t **versionp) { - dns_rbtdb_t *rbtdb = (dns_rbtdb_t *)db; - rbtdb_version_t *version; - - REQUIRE(VALID_RBTDB(rbtdb)); - REQUIRE(versionp != NULL && *versionp == NULL); - REQUIRE(rbtdb->future_version == NULL); - - LOCK(&rbtdb->lock); - RUNTIME_CHECK(rbtdb->next_serial != 0); /* XXX Error? */ - version = allocate_version(rbtdb->common.mctx, rbtdb->next_serial, 1, - ISC_TRUE); - if (version != NULL) { - version->commit_ok = ISC_TRUE; - rbtdb->next_serial++; - rbtdb->future_version = version; - } - UNLOCK(&rbtdb->lock); - - if (version == NULL) - return (ISC_R_NOMEMORY); - - *versionp = version; - - return (ISC_R_SUCCESS); -} - -static void -attachversion(dns_db_t *db, dns_dbversion_t *source, - dns_dbversion_t **targetp) -{ - dns_rbtdb_t *rbtdb = (dns_rbtdb_t *)db; - rbtdb_version_t *rbtversion = source; - - REQUIRE(VALID_RBTDB(rbtdb)); - - LOCK(&rbtdb->lock); - - INSIST(rbtversion->references > 0); - rbtversion->references++; - INSIST(rbtversion->references != 0); - - UNLOCK(&rbtdb->lock); - - *targetp = rbtversion; -} - -static rbtdb_changed_t * -add_changed(dns_rbtdb_t *rbtdb, rbtdb_version_t *version, - dns_rbtnode_t *node) -{ - rbtdb_changed_t *changed; - - /* - * Caller must be holding the node lock. - */ - - changed = isc_mem_get(rbtdb->common.mctx, sizeof(*changed)); - - LOCK(&rbtdb->lock); - - REQUIRE(version->writer); - - if (changed != NULL) { - INSIST(node->references > 0); - node->references++; - INSIST(node->references != 0); - changed->node = node; - changed->dirty = ISC_FALSE; - ISC_LIST_INITANDAPPEND(version->changed_list, changed, link); - } else - version->commit_ok = ISC_FALSE; - - UNLOCK(&rbtdb->lock); - - return (changed); -} - -static inline void -free_noqname(isc_mem_t *mctx, struct noqname **noqname) { - - if (dns_name_dynamic(&(*noqname)->name)) - dns_name_free(&(*noqname)->name, mctx); - if ((*noqname)->nsec != NULL) - isc_mem_put(mctx, (*noqname)->nsec, - dns_rdataslab_size((*noqname)->nsec, 0)); - if ((*noqname)->nsec != NULL) - isc_mem_put(mctx, (*noqname)->nsecsig, - dns_rdataslab_size((*noqname)->nsecsig, 0)); - isc_mem_put(mctx, *noqname, sizeof(**noqname)); - *noqname = NULL; -} - -static inline void -free_rdataset(isc_mem_t *mctx, rdatasetheader_t *rdataset) { - unsigned int size; - - if (rdataset->noqname != NULL) - free_noqname(mctx, &rdataset->noqname); - - if ((rdataset->attributes & RDATASET_ATTR_NONEXISTENT) != 0) - size = sizeof(*rdataset); - else - size = dns_rdataslab_size((unsigned char *)rdataset, - sizeof(*rdataset)); - isc_mem_put(mctx, rdataset, size); -} - -static inline void -rollback_node(dns_rbtnode_t *node, rbtdb_serial_t serial) { - rdatasetheader_t *header, *dcurrent; - isc_boolean_t make_dirty = ISC_FALSE; - - /* - * Caller must hold the node lock. - */ - - /* - * We set the IGNORE attribute on rdatasets with serial number - * 'serial'. When the reference count goes to zero, these rdatasets - * will be cleaned up; until that time, they will be ignored. - */ - for (header = node->data; header != NULL; header = header->next) { - if (header->serial == serial) { - header->attributes |= RDATASET_ATTR_IGNORE; - make_dirty = ISC_TRUE; - } - for (dcurrent = header->down; - dcurrent != NULL; - dcurrent = dcurrent->down) { - if (dcurrent->serial == serial) { - dcurrent->attributes |= RDATASET_ATTR_IGNORE; - make_dirty = ISC_TRUE; - } - } - } - if (make_dirty) - node->dirty = 1; -} - -static inline void -clean_cache_node(dns_rbtdb_t *rbtdb, dns_rbtnode_t *node) { - rdatasetheader_t *current, *dcurrent, *top_prev, *top_next, *down_next; - isc_mem_t *mctx = rbtdb->common.mctx; - - /* - * Caller must be holding the node lock. - */ - - top_prev = NULL; - for (current = node->data; current != NULL; current = top_next) { - top_next = current->next; - dcurrent = current->down; - if (dcurrent != NULL) { - do { - down_next = dcurrent->down; - free_rdataset(mctx, dcurrent); - dcurrent = down_next; - } while (dcurrent != NULL); - current->down = NULL; - } - /* - * If current is nonexistent or stale, we can clean it up. - */ - if ((current->attributes & - (RDATASET_ATTR_NONEXISTENT|RDATASET_ATTR_STALE)) != 0) { - if (top_prev != NULL) - top_prev->next = current->next; - else - node->data = current->next; - free_rdataset(mctx, current); - } else - top_prev = current; - } - node->dirty = 0; -} - -static inline void -clean_zone_node(dns_rbtdb_t *rbtdb, dns_rbtnode_t *node, - rbtdb_serial_t least_serial) -{ - rdatasetheader_t *current, *dcurrent, *down_next, *dparent; - rdatasetheader_t *top_prev, *top_next; - isc_mem_t *mctx = rbtdb->common.mctx; - isc_boolean_t still_dirty = ISC_FALSE; - - /* - * Caller must be holding the node lock. - */ - REQUIRE(least_serial != 0); - - top_prev = NULL; - for (current = node->data; current != NULL; current = top_next) { - top_next = current->next; - - /* - * First, we clean up any instances of multiple rdatasets - * with the same serial number, or that have the IGNORE - * attribute. - */ - dparent = current; - for (dcurrent = current->down; - dcurrent != NULL; - dcurrent = down_next) { - down_next = dcurrent->down; - INSIST(dcurrent->serial <= dparent->serial); - if (dcurrent->serial == dparent->serial || - IGNORE(dcurrent)) { - if (down_next != NULL) - down_next->next = dparent; - dparent->down = down_next; - free_rdataset(mctx, dcurrent); - } else - dparent = dcurrent; - } - - /* - * We've now eliminated all IGNORE datasets with the possible - * exception of current, which we now check. - */ - if (IGNORE(current)) { - down_next = current->down; - if (down_next == NULL) { - if (top_prev != NULL) - top_prev->next = current->next; - else - node->data = current->next; - free_rdataset(mctx, current); - /* - * current no longer exists, so we can - * just continue with the loop. - */ - continue; - } else { - /* - * Pull up current->down, making it the new - * current. - */ - if (top_prev != NULL) - top_prev->next = down_next; - else - node->data = down_next; - down_next->next = top_next; - free_rdataset(mctx, current); - current = down_next; - } - } - - /* - * We now try to find the first down node less than the - * least serial. - */ - dparent = current; - for (dcurrent = current->down; - dcurrent != NULL; - dcurrent = down_next) { - down_next = dcurrent->down; - if (dcurrent->serial < least_serial) - break; - dparent = dcurrent; - } - - /* - * If there is a such an rdataset, delete it and any older - * versions. - */ - if (dcurrent != NULL) { - do { - down_next = dcurrent->down; - INSIST(dcurrent->serial <= least_serial); - free_rdataset(mctx, dcurrent); - dcurrent = down_next; - } while (dcurrent != NULL); - dparent->down = NULL; - } - - /* - * Note. The serial number of 'current' might be less than - * least_serial too, but we cannot delete it because it is - * the most recent version, unless it is a NONEXISTENT - * rdataset. - */ - if (current->down != NULL) { - still_dirty = ISC_TRUE; - top_prev = current; - } else { - /* - * If this is a NONEXISTENT rdataset, we can delete it. - */ - if (NONEXISTENT(current)) { - if (top_prev != NULL) - top_prev->next = current->next; - else - node->data = current->next; - free_rdataset(mctx, current); - } else - top_prev = current; - } - } - if (!still_dirty) - node->dirty = 0; -} - -static inline void -new_reference(dns_rbtdb_t *rbtdb, dns_rbtnode_t *node) { - if (node->references == 0) { - rbtdb->node_locks[node->locknum].references++; - INSIST(rbtdb->node_locks[node->locknum].references != 0); - } - node->references++; - INSIST(node->references != 0); -} - -static void -no_references(dns_rbtdb_t *rbtdb, dns_rbtnode_t *node, - rbtdb_serial_t least_serial, isc_rwlocktype_t lock) -{ - isc_result_t result; - isc_boolean_t write_locked; - unsigned int locknum; - - /* - * Caller must be holding the node lock. - */ - - REQUIRE(node->references == 0); - - if (node->dirty) { - if (IS_CACHE(rbtdb)) - clean_cache_node(rbtdb, node); - else { - if (least_serial == 0) { - /* - * Caller doesn't know the least serial. - * Get it. - */ - LOCK(&rbtdb->lock); - least_serial = rbtdb->least_serial; - UNLOCK(&rbtdb->lock); - } - clean_zone_node(rbtdb, node, least_serial); - } - } - - locknum = node->locknum; - - INSIST(rbtdb->node_locks[locknum].references > 0); - rbtdb->node_locks[locknum].references--; - - /* - * XXXDCL should this only be done for cache zones? - */ - if (node->data != NULL || node->down != NULL) - return; - - /* - * XXXDCL need to add a deferred delete method for ISC_R_LOCKBUSY. - */ - if (lock != isc_rwlocktype_write) { - /* - * Locking hierarchy notwithstanding, we don't need to free - * the node lock before acquiring the tree write lock because - * we only do a trylock. - */ - if (lock == isc_rwlocktype_read) - result = isc_rwlock_tryupgrade(&rbtdb->tree_lock); - else - result = isc_rwlock_trylock(&rbtdb->tree_lock, - isc_rwlocktype_write); - RUNTIME_CHECK(result == ISC_R_SUCCESS || - result == ISC_R_LOCKBUSY); - - write_locked = ISC_TF(result == ISC_R_SUCCESS); - } else - write_locked = ISC_TRUE; - - if (write_locked) { - if (isc_log_wouldlog(dns_lctx, ISC_LOG_DEBUG(1))) { - char printname[DNS_NAME_FORMATSIZE]; - - isc_log_write(dns_lctx, DNS_LOGCATEGORY_DATABASE, - DNS_LOGMODULE_CACHE, ISC_LOG_DEBUG(1), - "no_references: delete from rbt: %p %s", - node, - dns_rbt_formatnodename(node, printname, - sizeof(printname))); - } - - result = dns_rbt_deletenode(rbtdb->tree, node, ISC_FALSE); - if (result != ISC_R_SUCCESS) - isc_log_write(dns_lctx, DNS_LOGCATEGORY_DATABASE, - DNS_LOGMODULE_CACHE, ISC_LOG_WARNING, - "no_references: dns_rbt_deletenode: %s", - isc_result_totext(result)); - } - - /* - * Relock a read lock, or unlock the write lock if no lock was held. - */ - if (lock == isc_rwlocktype_none) - if (write_locked) - RWUNLOCK(&rbtdb->tree_lock, isc_rwlocktype_write); - - if (lock == isc_rwlocktype_read) - if (write_locked) - isc_rwlock_downgrade(&rbtdb->tree_lock); -} - -static inline void -make_least_version(dns_rbtdb_t *rbtdb, rbtdb_version_t *version, - rbtdb_changedlist_t *cleanup_list) -{ - /* - * Caller must be holding the database lock. - */ - - rbtdb->least_serial = version->serial; - *cleanup_list = version->changed_list; - ISC_LIST_INIT(version->changed_list); -} - -static inline void -cleanup_nondirty(rbtdb_version_t *version, rbtdb_changedlist_t *cleanup_list) { - rbtdb_changed_t *changed, *next_changed; - - /* - * If the changed record is dirty, then - * an update created multiple versions of - * a given rdataset. We keep this list - * until we're the least open version, at - * which point it's safe to get rid of any - * older versions. - * - * If the changed record isn't dirty, then - * we don't need it anymore since we're - * committing and not rolling back. - * - * The caller must be holding the database lock. - */ - for (changed = HEAD(version->changed_list); - changed != NULL; - changed = next_changed) { - next_changed = NEXT(changed, link); - if (!changed->dirty) { - UNLINK(version->changed_list, - changed, link); - APPEND(*cleanup_list, - changed, link); - } - } -} - -static void -closeversion(dns_db_t *db, dns_dbversion_t **versionp, isc_boolean_t commit) { - dns_rbtdb_t *rbtdb = (dns_rbtdb_t *)db; - rbtdb_version_t *version, *cleanup_version, *least_greater; - isc_boolean_t rollback = ISC_FALSE; - rbtdb_changedlist_t cleanup_list; - rbtdb_changed_t *changed, *next_changed; - rbtdb_serial_t serial, least_serial; - dns_rbtnode_t *rbtnode; - isc_mutex_t *lock; - - REQUIRE(VALID_RBTDB(rbtdb)); - version = (rbtdb_version_t *)*versionp; - - cleanup_version = NULL; - ISC_LIST_INIT(cleanup_list); - - LOCK(&rbtdb->lock); - INSIST(version->references > 0); - INSIST(!version->writer || !(commit && version->references > 1)); - version->references--; - serial = version->serial; - if (version->references == 0) { - if (version->writer) { - if (commit) { - INSIST(version->commit_ok); - INSIST(version == rbtdb->future_version); - if (EMPTY(rbtdb->open_versions)) { - /* - * We're going to become the least open - * version. - */ - make_least_version(rbtdb, version, - &cleanup_list); - } else { - /* - * Some other open version is the - * least version. We can't cleanup - * records that were changed in this - * version because the older versions - * may still be in use by an open - * version. - * - * We can, however, discard the - * changed records for things that - * we've added that didn't exist in - * prior versions. - */ - cleanup_nondirty(version, - &cleanup_list); - } - /* - * If the (soon to be former) current version - * isn't being used by anyone, we can clean - * it up. - */ - if (rbtdb->current_version->references == 0) { - cleanup_version = - rbtdb->current_version; - APPENDLIST(version->changed_list, - cleanup_version->changed_list, - link); - } - /* - * Become the current version. - */ - version->writer = ISC_FALSE; - rbtdb->current_version = version; - rbtdb->current_serial = version->serial; - rbtdb->future_version = NULL; - } else { - /* - * We're rolling back this transaction. - */ - cleanup_list = version->changed_list; - ISC_LIST_INIT(version->changed_list); - rollback = ISC_TRUE; - cleanup_version = version; - rbtdb->future_version = NULL; - } - } else { - if (version != rbtdb->current_version) { - /* - * There are no external or internal references - * to this version and it can be cleaned up. - */ - cleanup_version = version; - - /* - * Find the version with the least serial - * number greater than ours. - */ - least_greater = PREV(version, link); - if (least_greater == NULL) - least_greater = rbtdb->current_version; - - INSIST(version->serial < least_greater->serial); - /* - * Is this the least open version? - */ - if (version->serial == rbtdb->least_serial) { - /* - * Yes. Install the new least open - * version. - */ - make_least_version(rbtdb, - least_greater, - &cleanup_list); - } else { - /* - * Add any unexecuted cleanups to - * those of the least greater version. - */ - APPENDLIST(least_greater->changed_list, - version->changed_list, - link); - } - } else if (version->serial == rbtdb->least_serial) - INSIST(EMPTY(version->changed_list)); - UNLINK(rbtdb->open_versions, version, link); - } - } - least_serial = rbtdb->least_serial; - UNLOCK(&rbtdb->lock); - - if (cleanup_version != NULL) { - INSIST(EMPTY(cleanup_version->changed_list)); - isc_mem_put(rbtdb->common.mctx, cleanup_version, - sizeof(*cleanup_version)); - } - - if (!EMPTY(cleanup_list)) { - for (changed = HEAD(cleanup_list); - changed != NULL; - changed = next_changed) { - next_changed = NEXT(changed, link); - rbtnode = changed->node; - lock = &rbtdb->node_locks[rbtnode->locknum].lock; - - LOCK(lock); - - INSIST(rbtnode->references > 0); - rbtnode->references--; - if (rollback) - rollback_node(rbtnode, serial); - - if (rbtnode->references == 0) - no_references(rbtdb, rbtnode, least_serial, - isc_rwlocktype_none); - - UNLOCK(lock); - - isc_mem_put(rbtdb->common.mctx, changed, - sizeof(*changed)); - } - } - - *versionp = NULL; -} - -/* - * Add the necessary magic for the wildcard name 'name' - * to be found in 'rbtdb'. - * - * In order for wildcard matching to work correctly in - * zone_find(), we must ensure that a node for the wildcarding - * level exists in the database, and has its 'find_callback' - * and 'wild' bits set. - * - * E.g. if the wildcard name is "*.sub.example." then we - * must ensure that "sub.example." exists and is marked as - * a wildcard level. - */ -static isc_result_t -add_wildcard_magic(dns_rbtdb_t *rbtdb, dns_name_t *name) { - isc_result_t result; - dns_name_t foundname; - dns_offsets_t offsets; - unsigned int n; - dns_rbtnode_t *node = NULL; - - dns_name_init(&foundname, offsets); - n = dns_name_countlabels(name); - INSIST(n >= 2); - n--; - dns_name_getlabelsequence(name, 1, n, &foundname); - result = dns_rbt_addnode(rbtdb->tree, &foundname, &node); - if (result != ISC_R_SUCCESS && result != ISC_R_EXISTS) - return (result); - node->find_callback = 1; - node->wild = 1; - return (ISC_R_SUCCESS); -} - -static isc_result_t -add_empty_wildcards(dns_rbtdb_t *rbtdb, dns_name_t *name) { - isc_result_t result; - dns_name_t foundname; - dns_offsets_t offsets; - unsigned int n, l, i; - - dns_name_init(&foundname, offsets); - n = dns_name_countlabels(name); - l = dns_name_countlabels(&rbtdb->common.origin); - i = l + 1; - while (i < n) { - dns_rbtnode_t *node = NULL; /* dummy */ - dns_name_getlabelsequence(name, n - i, i, &foundname); - if (dns_name_iswildcard(&foundname)) { - result = add_wildcard_magic(rbtdb, &foundname); - if (result != ISC_R_SUCCESS) - return (result); - result = dns_rbt_addnode(rbtdb->tree, &foundname, - &node); - if (result != ISC_R_SUCCESS && result != ISC_R_EXISTS) - return (result); - } - i++; - } - return (ISC_R_SUCCESS); -} - -static isc_result_t -findnode(dns_db_t *db, dns_name_t *name, isc_boolean_t create, - dns_dbnode_t **nodep) -{ - dns_rbtdb_t *rbtdb = (dns_rbtdb_t *)db; - dns_rbtnode_t *node = NULL; - dns_name_t nodename; - unsigned int locknum; - isc_result_t result; - isc_rwlocktype_t locktype = isc_rwlocktype_read; - - REQUIRE(VALID_RBTDB(rbtdb)); - - dns_name_init(&nodename, NULL); - RWLOCK(&rbtdb->tree_lock, locktype); - result = dns_rbt_findnode(rbtdb->tree, name, NULL, &node, NULL, - DNS_RBTFIND_EMPTYDATA, NULL, NULL); - if (result != ISC_R_SUCCESS) { - RWUNLOCK(&rbtdb->tree_lock, locktype); - if (!create) { - if (result == DNS_R_PARTIALMATCH) - result = ISC_R_NOTFOUND; - return (result); - } - /* - * It would be nice to try to upgrade the lock instead of - * unlocking then relocking. - */ - locktype = isc_rwlocktype_write; - RWLOCK(&rbtdb->tree_lock, locktype); - node = NULL; - result = dns_rbt_addnode(rbtdb->tree, name, &node); - if (result == ISC_R_SUCCESS) { - dns_rbt_namefromnode(node, &nodename); -#ifdef DNS_RBT_USEHASH - node->locknum = node->hashval % rbtdb->node_lock_count; -#else - node->locknum = dns_name_hash(&nodename, ISC_TRUE) % - rbtdb->node_lock_count; -#endif - add_empty_wildcards(rbtdb, name); - - if (dns_name_iswildcard(name)) { - result = add_wildcard_magic(rbtdb, name); - if (result != ISC_R_SUCCESS) { - RWUNLOCK(&rbtdb->tree_lock, locktype); - return (result); - } - } - } else if (result != ISC_R_EXISTS) { - RWUNLOCK(&rbtdb->tree_lock, locktype); - return (result); - } - } - locknum = node->locknum; - LOCK(&rbtdb->node_locks[locknum].lock); - new_reference(rbtdb, node); - UNLOCK(&rbtdb->node_locks[locknum].lock); - RWUNLOCK(&rbtdb->tree_lock, locktype); - - *nodep = (dns_dbnode_t *)node; - - return (ISC_R_SUCCESS); -} - -static isc_result_t -zone_zonecut_callback(dns_rbtnode_t *node, dns_name_t *name, void *arg) { - rbtdb_search_t *search = arg; - rdatasetheader_t *header, *header_next; - rdatasetheader_t *dname_header, *sigdname_header, *ns_header; - rdatasetheader_t *found; - isc_result_t result; - dns_rbtnode_t *onode; - - /* - * We only want to remember the topmost zone cut, since it's the one - * that counts, so we'll just continue if we've already found a - * zonecut. - */ - if (search->zonecut != NULL) - return (DNS_R_CONTINUE); - - found = NULL; - result = DNS_R_CONTINUE; - onode = search->rbtdb->origin_node; - - LOCK(&(search->rbtdb->node_locks[node->locknum].lock)); - - /* - * Look for an NS or DNAME rdataset active in our version. - */ - ns_header = NULL; - dname_header = NULL; - sigdname_header = NULL; - for (header = node->data; header != NULL; header = header_next) { - header_next = header->next; - if (header->type == dns_rdatatype_ns || - header->type == dns_rdatatype_dname || - header->type == RBTDB_RDATATYPE_SIGDNAME) { - do { - if (header->serial <= search->serial && - !IGNORE(header)) { - /* - * Is this a "this rdataset doesn't - * exist" record? - */ - if (NONEXISTENT(header)) - header = NULL; - break; - } else - header = header->down; - } while (header != NULL); - if (header != NULL) { - if (header->type == dns_rdatatype_dname) - dname_header = header; - else if (header->type == - RBTDB_RDATATYPE_SIGDNAME) - sigdname_header = header; - else if (node != onode || - IS_STUB(search->rbtdb)) { - /* - * We've found an NS rdataset that - * isn't at the origin node. We check - * that they're not at the origin node, - * because otherwise we'd erroneously - * treat the zone top as if it were - * a delegation. - */ - ns_header = header; - } - } - } - } - - /* - * Did we find anything? - */ - if (dname_header != NULL) { - /* - * Note that DNAME has precedence over NS if both exist. - */ - found = dname_header; - search->zonecut_sigrdataset = sigdname_header; - } else if (ns_header != NULL) { - found = ns_header; - search->zonecut_sigrdataset = NULL; - } - - if (found != NULL) { - /* - * We increment the reference count on node to ensure that - * search->zonecut_rdataset will still be valid later. - */ - new_reference(search->rbtdb, node); - search->zonecut = node; - search->zonecut_rdataset = found; - search->need_cleanup = ISC_TRUE; - /* - * Since we've found a zonecut, anything beneath it is - * glue and is not subject to wildcard matching, so we - * may clear search->wild. - */ - search->wild = ISC_FALSE; - if ((search->options & DNS_DBFIND_GLUEOK) == 0) { - /* - * If the caller does not want to find glue, then - * this is the best answer and the search should - * stop now. - */ - result = DNS_R_PARTIALMATCH; - } else { - dns_name_t *zcname; - - /* - * The search will continue beneath the zone cut. - * This may or may not be the best match. In case it - * is, we need to remember the node name. - */ - zcname = dns_fixedname_name(&search->zonecut_name); - RUNTIME_CHECK(dns_name_copy(name, zcname, NULL) == - ISC_R_SUCCESS); - search->copy_name = ISC_TRUE; - } - } else { - /* - * There is no zonecut at this node which is active in this - * version. - * - * If this is a "wild" node and the caller hasn't disabled - * wildcard matching, remember that we've seen a wild node - * in case we need to go searching for wildcard matches - * later on. - */ - if (node->wild && (search->options & DNS_DBFIND_NOWILD) == 0) - search->wild = ISC_TRUE; - } - - UNLOCK(&(search->rbtdb->node_locks[node->locknum].lock)); - - return (result); -} - -static inline void -bind_rdataset(dns_rbtdb_t *rbtdb, dns_rbtnode_t *node, - rdatasetheader_t *header, isc_stdtime_t now, - dns_rdataset_t *rdataset) -{ - unsigned char *raw; - - /* - * Caller must be holding the node lock. - */ - - if (rdataset == NULL) - return; - - new_reference(rbtdb, node); - - INSIST(rdataset->methods == NULL); /* We must be disassociated. */ - - rdataset->methods = &rdataset_methods; - rdataset->rdclass = rbtdb->common.rdclass; - rdataset->type = RBTDB_RDATATYPE_BASE(header->type); - rdataset->covers = RBTDB_RDATATYPE_EXT(header->type); - rdataset->ttl = header->ttl - now; - rdataset->trust = header->trust; - if (NXDOMAIN(header)) - rdataset->attributes |= DNS_RDATASETATTR_NXDOMAIN; - rdataset->private1 = rbtdb; - rdataset->private2 = node; - raw = (unsigned char *)header + sizeof(*header); - rdataset->private3 = raw; - rdataset->count = header->count++; - if (header->count == ISC_UINT32_MAX) - header->count = 0; - - /* - * Reset iterator state. - */ - rdataset->privateuint4 = 0; - rdataset->private5 = NULL; - - /* - * Add noqname proof. - */ - rdataset->private6 = header->noqname; - if (rdataset->private6 != NULL) - rdataset->attributes |= DNS_RDATASETATTR_NOQNAME; -} - -static inline isc_result_t -setup_delegation(rbtdb_search_t *search, dns_dbnode_t **nodep, - dns_name_t *foundname, dns_rdataset_t *rdataset, - dns_rdataset_t *sigrdataset) -{ - isc_result_t result; - dns_name_t *zcname; - rbtdb_rdatatype_t type; - dns_rbtnode_t *node; - - /* - * The caller MUST NOT be holding any node locks. - */ - - node = search->zonecut; - type = search->zonecut_rdataset->type; - - /* - * If we have to set foundname, we do it before anything else. - * If we were to set foundname after we had set nodep or bound the - * rdataset, then we'd have to undo that work if dns_name_copy() - * failed. By setting foundname first, there's nothing to undo if - * we have trouble. - */ - if (foundname != NULL && search->copy_name) { - zcname = dns_fixedname_name(&search->zonecut_name); - result = dns_name_copy(zcname, foundname, NULL); - if (result != ISC_R_SUCCESS) - return (result); - } - if (nodep != NULL) { - /* - * Note that we don't have to increment the node's reference - * count here because we're going to use the reference we - * already have in the search block. - */ - *nodep = node; - search->need_cleanup = ISC_FALSE; - } - if (rdataset != NULL) { - LOCK(&(search->rbtdb->node_locks[node->locknum].lock)); - bind_rdataset(search->rbtdb, node, search->zonecut_rdataset, - search->now, rdataset); - if (sigrdataset != NULL && search->zonecut_sigrdataset != NULL) - bind_rdataset(search->rbtdb, node, - search->zonecut_sigrdataset, - search->now, sigrdataset); - UNLOCK(&(search->rbtdb->node_locks[node->locknum].lock)); - } - - if (type == dns_rdatatype_dname) - return (DNS_R_DNAME); - return (DNS_R_DELEGATION); -} - -static inline isc_boolean_t -valid_glue(rbtdb_search_t *search, dns_name_t *name, rbtdb_rdatatype_t type, - dns_rbtnode_t *node) -{ - unsigned char *raw; - unsigned int count, size; - dns_name_t ns_name; - isc_boolean_t valid = ISC_FALSE; - dns_offsets_t offsets; - isc_region_t region; - rdatasetheader_t *header; - - /* - * No additional locking is required. - */ - - /* - * Valid glue types are A, AAAA, A6. NS is also a valid glue type - * if it occurs at a zone cut, but is not valid below it. - */ - if (type == dns_rdatatype_ns) { - if (node != search->zonecut) { - return (ISC_FALSE); - } - } else if (type != dns_rdatatype_a && - type != dns_rdatatype_aaaa && - type != dns_rdatatype_a6) { - return (ISC_FALSE); - } - - header = search->zonecut_rdataset; - raw = (unsigned char *)header + sizeof(*header); - count = raw[0] * 256 + raw[1]; - raw += 2; - - while (count > 0) { - count--; - size = raw[0] * 256 + raw[1]; - raw += 2; - region.base = raw; - region.length = size; - raw += size; - /* - * XXX Until we have rdata structures, we have no choice but - * to directly access the rdata format. - */ - dns_name_init(&ns_name, offsets); - dns_name_fromregion(&ns_name, ®ion); - if (dns_name_compare(&ns_name, name) == 0) { - valid = ISC_TRUE; - break; - } - } - - return (valid); -} - -static inline isc_boolean_t -activeempty(rbtdb_search_t *search, dns_rbtnodechain_t *chain, - dns_name_t *name) -{ - dns_fixedname_t fnext; - dns_fixedname_t forigin; - dns_name_t *next; - dns_name_t *origin; - dns_name_t prefix; - dns_rbtdb_t *rbtdb; - dns_rbtnode_t *node; - isc_result_t result; - isc_boolean_t answer = ISC_FALSE; - rdatasetheader_t *header; - - rbtdb = search->rbtdb; - - dns_name_init(&prefix, NULL); - dns_fixedname_init(&fnext); - next = dns_fixedname_name(&fnext); - dns_fixedname_init(&forigin); - origin = dns_fixedname_name(&forigin); - - result = dns_rbtnodechain_next(chain, NULL, NULL); - while (result == ISC_R_SUCCESS || result == DNS_R_NEWORIGIN) { - node = NULL; - result = dns_rbtnodechain_current(chain, &prefix, - origin, &node); - if (result != ISC_R_SUCCESS) - break; - LOCK(&(rbtdb->node_locks[node->locknum].lock)); - for (header = node->data; - header != NULL; - header = header->next) { - if (header->serial <= search->serial && - !IGNORE(header) && EXISTS(header)) - break; - } - UNLOCK(&(rbtdb->node_locks[node->locknum].lock)); - if (header != NULL) - break; - result = dns_rbtnodechain_next(chain, NULL, NULL); - } - if (result == ISC_R_SUCCESS) - result = dns_name_concatenate(&prefix, origin, next, NULL); - if (result == ISC_R_SUCCESS && dns_name_issubdomain(next, name)) - answer = ISC_TRUE; - return (answer); -} - -static inline isc_boolean_t -activeemtpynode(rbtdb_search_t *search, dns_name_t *qname, dns_name_t *wname) { - dns_fixedname_t fnext; - dns_fixedname_t forigin; - dns_fixedname_t fprev; - dns_name_t *next; - dns_name_t *origin; - dns_name_t *prev; - dns_name_t name; - dns_name_t rname; - dns_name_t tname; - dns_rbtdb_t *rbtdb; - dns_rbtnode_t *node; - dns_rbtnodechain_t chain; - isc_boolean_t check_next = ISC_TRUE; - isc_boolean_t check_prev = ISC_TRUE; - isc_boolean_t answer = ISC_FALSE; - isc_result_t result; - rdatasetheader_t *header; - unsigned int n; - - rbtdb = search->rbtdb; - - dns_name_init(&name, NULL); - dns_name_init(&tname, NULL); - dns_name_init(&rname, NULL); - dns_fixedname_init(&fnext); - next = dns_fixedname_name(&fnext); - dns_fixedname_init(&fprev); - prev = dns_fixedname_name(&fprev); - dns_fixedname_init(&forigin); - origin = dns_fixedname_name(&forigin); - - /* - * Find if qname is at or below a empty node. - * Use our own copy of the chain. - */ - - chain = search->chain; - do { - node = NULL; - result = dns_rbtnodechain_current(&chain, &name, - origin, &node); - if (result != ISC_R_SUCCESS) - break; - LOCK(&(rbtdb->node_locks[node->locknum].lock)); - for (header = node->data; - header != NULL; - header = header->next) { - if (header->serial <= search->serial && - !IGNORE(header) && EXISTS(header)) - break; - } - UNLOCK(&(rbtdb->node_locks[node->locknum].lock)); - if (header != NULL) - break; - result = dns_rbtnodechain_prev(&chain, NULL, NULL); - } while (result == ISC_R_SUCCESS || result == DNS_R_NEWORIGIN); - if (result == ISC_R_SUCCESS) - result = dns_name_concatenate(&name, origin, prev, NULL); - if (result != ISC_R_SUCCESS) - check_prev = ISC_FALSE; - - result = dns_rbtnodechain_next(&chain, NULL, NULL); - while (result == ISC_R_SUCCESS || result == DNS_R_NEWORIGIN) { - node = NULL; - result = dns_rbtnodechain_current(&chain, &name, - origin, &node); - if (result != ISC_R_SUCCESS) - break; - LOCK(&(rbtdb->node_locks[node->locknum].lock)); - for (header = node->data; - header != NULL; - header = header->next) { - if (header->serial <= search->serial && - !IGNORE(header) && EXISTS(header)) - break; - } - UNLOCK(&(rbtdb->node_locks[node->locknum].lock)); - if (header != NULL) - break; - result = dns_rbtnodechain_next(&chain, NULL, NULL); - } - if (result == ISC_R_SUCCESS) - result = dns_name_concatenate(&name, origin, next, NULL); - if (result != ISC_R_SUCCESS) - check_next = ISC_FALSE; - - dns_name_clone(qname, &rname); - - /* - * Remove the wildcard label to find the terminal name. - */ - n = dns_name_countlabels(wname); - dns_name_getlabelsequence(wname, 1, n - 1, &tname); - - do { - if ((check_prev && dns_name_issubdomain(prev, &rname)) || - (check_next && dns_name_issubdomain(next, &rname))) { - answer = ISC_TRUE; - break; - } - /* - * Remove the left hand label. - */ - n = dns_name_countlabels(&rname); - dns_name_getlabelsequence(&rname, 1, n - 1, &rname); - } while (!dns_name_equal(&rname, &tname)); - return (answer); -} - -static inline isc_result_t -find_wildcard(rbtdb_search_t *search, dns_rbtnode_t **nodep, - dns_name_t *qname) -{ - unsigned int i, j; - dns_rbtnode_t *node, *level_node, *wnode; - rdatasetheader_t *header; - isc_result_t result = ISC_R_NOTFOUND; - dns_name_t name; - dns_name_t *wname; - dns_fixedname_t fwname; - dns_rbtdb_t *rbtdb; - isc_boolean_t done, wild, active; - dns_rbtnodechain_t wchain; - - /* - * Caller must be holding the tree lock and MUST NOT be holding - * any node locks. - */ - - /* - * Examine each ancestor level. If the level's wild bit - * is set, then construct the corresponding wildcard name and - * search for it. If the wildcard node exists, and is active in - * this version, we're done. If not, then we next check to see - * if the ancestor is active in this version. If so, then there - * can be no possible wildcard match and again we're done. If not, - * continue the search. - */ - - rbtdb = search->rbtdb; - i = search->chain.level_matches; - done = ISC_FALSE; - node = *nodep; - do { - LOCK(&(rbtdb->node_locks[node->locknum].lock)); - - /* - * First we try to figure out if this node is active in - * the search's version. We do this now, even though we - * may not need the information, because it simplifies the - * locking and code flow. - */ - for (header = node->data; - header != NULL; - header = header->next) { - if (header->serial <= search->serial && - !IGNORE(header) && EXISTS(header)) - break; - } - if (header != NULL) - active = ISC_TRUE; - else - active = ISC_FALSE; - - if (node->wild) - wild = ISC_TRUE; - else - wild = ISC_FALSE; - - UNLOCK(&(rbtdb->node_locks[node->locknum].lock)); - - if (wild) { - /* - * Construct the wildcard name for this level. - */ - dns_name_init(&name, NULL); - dns_rbt_namefromnode(node, &name); - dns_fixedname_init(&fwname); - wname = dns_fixedname_name(&fwname); - result = dns_name_concatenate(dns_wildcardname, &name, - wname, NULL); - j = i; - while (result == ISC_R_SUCCESS && j != 0) { - j--; - level_node = search->chain.levels[j]; - dns_name_init(&name, NULL); - dns_rbt_namefromnode(level_node, &name); - result = dns_name_concatenate(wname, - &name, - wname, - NULL); - } - if (result != ISC_R_SUCCESS) - break; - - wnode = NULL; - dns_rbtnodechain_init(&wchain, NULL); - result = dns_rbt_findnode(rbtdb->tree, wname, - NULL, &wnode, &wchain, - DNS_RBTFIND_EMPTYDATA, - NULL, NULL); - if (result == ISC_R_SUCCESS) { - /* - * We have found the wildcard node. If it - * is active in the search's version, we're - * done. - */ - LOCK(&(rbtdb->node_locks[wnode->locknum].lock)); - for (header = wnode->data; - header != NULL; - header = header->next) { - if (header->serial <= search->serial && - !IGNORE(header) && EXISTS(header)) - break; - } - UNLOCK(&(rbtdb->node_locks[wnode->locknum].lock)); - if (header != NULL || - activeempty(search, &wchain, wname)) { - if (activeemtpynode(search, qname, wname)) - return (ISC_R_NOTFOUND); - /* - * The wildcard node is active! - * - * Note: result is still ISC_R_SUCCESS - * so we don't have to set it. - */ - *nodep = wnode; - break; - } - } else if (result != ISC_R_NOTFOUND && - result != DNS_R_PARTIALMATCH) { - /* - * An error has occurred. Bail out. - */ - break; - } - } - - if (active) { - /* - * The level node is active. Any wildcarding - * present at higher levels has no - * effect and we're done. - */ - result = ISC_R_NOTFOUND; - break; - } - - if (i > 0) { - i--; - node = search->chain.levels[i]; - } else - done = ISC_TRUE; - } while (!done); - - return (result); -} - -static inline isc_result_t -find_closest_nsec(rbtdb_search_t *search, dns_dbnode_t **nodep, - dns_name_t *foundname, dns_rdataset_t *rdataset, - dns_rdataset_t *sigrdataset, isc_boolean_t need_sig) -{ - dns_rbtnode_t *node; - rdatasetheader_t *header, *header_next, *found, *foundsig; - isc_boolean_t empty_node; - isc_result_t result; - dns_fixedname_t fname, forigin; - dns_name_t *name, *origin; - - do { - node = NULL; - dns_fixedname_init(&fname); - name = dns_fixedname_name(&fname); - dns_fixedname_init(&forigin); - origin = dns_fixedname_name(&forigin); - result = dns_rbtnodechain_current(&search->chain, name, - origin, &node); - if (result != ISC_R_SUCCESS) - return (result); - LOCK(&(search->rbtdb->node_locks[node->locknum].lock)); - found = NULL; - foundsig = NULL; - empty_node = ISC_TRUE; - for (header = node->data; - header != NULL; - header = header_next) { - header_next = header->next; - /* - * Look for an active, extant NSEC or RRSIG NSEC. - */ - do { - if (header->serial <= search->serial && - !IGNORE(header)) { - /* - * Is this a "this rdataset doesn't - * exist" record? - */ - if (NONEXISTENT(header)) - header = NULL; - break; - } else - header = header->down; - } while (header != NULL); - if (header != NULL) { - /* - * We now know that there is at least one - * active rdataset at this node. - */ - empty_node = ISC_FALSE; - if (header->type == dns_rdatatype_nsec) { - found = header; - if (foundsig != NULL) - break; - } else if (header->type == - RBTDB_RDATATYPE_SIGNSEC) { - foundsig = header; - if (found != NULL) - break; - } - } - } - if (!empty_node) { - if (found != NULL && - (foundsig != NULL || !need_sig)) - { - /* - * We've found the right NSEC record. - * - * Note: for this to really be the right - * NSEC record, it's essential that the NSEC - * records of any nodes obscured by a zone - * cut have been removed; we assume this is - * the case. - */ - result = dns_name_concatenate(name, origin, - foundname, NULL); - if (result == ISC_R_SUCCESS) { - if (nodep != NULL) { - new_reference(search->rbtdb, - node); - *nodep = node; - } - bind_rdataset(search->rbtdb, node, - found, search->now, - rdataset); - if (foundsig != NULL) - bind_rdataset(search->rbtdb, - node, - foundsig, - search->now, - sigrdataset); - } - } else if (found == NULL && foundsig == NULL) { - /* - * This node is active, but has no NSEC or - * RRSIG NSEC. That means it's glue or - * other obscured zone data that isn't - * relevant for our search. Treat the - * node as if it were empty and keep looking. - */ - empty_node = ISC_TRUE; - result = dns_rbtnodechain_prev(&search->chain, - NULL, NULL); - } else { - /* - * We found an active node, but either the - * NSEC or the RRSIG NSEC is missing. This - * shouldn't happen. - */ - result = DNS_R_BADDB; - } - } else { - /* - * This node isn't active. We've got to keep - * looking. - */ - result = dns_rbtnodechain_prev(&search->chain, NULL, - NULL); - } - UNLOCK(&(search->rbtdb->node_locks[node->locknum].lock)); - } while (empty_node && result == ISC_R_SUCCESS); - - /* - * If the result is ISC_R_NOMORE, then we got to the beginning of - * the database and didn't find a NSEC record. This shouldn't - * happen. - */ - if (result == ISC_R_NOMORE) - result = DNS_R_BADDB; - - return (result); -} - -static isc_result_t -zone_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) -{ - dns_rbtnode_t *node = NULL; - isc_result_t result; - rbtdb_search_t search; - isc_boolean_t cname_ok = ISC_TRUE; - isc_boolean_t close_version = ISC_FALSE; - isc_boolean_t maybe_zonecut = ISC_FALSE; - isc_boolean_t at_zonecut = ISC_FALSE; - isc_boolean_t wild; - isc_boolean_t empty_node; - isc_mutex_t *lock; - rdatasetheader_t *header, *header_next, *found, *nsecheader; - rdatasetheader_t *foundsig, *cnamesig, *nsecsig; - rbtdb_rdatatype_t sigtype; - isc_boolean_t active; - dns_rbtnodechain_t chain; - - - search.rbtdb = (dns_rbtdb_t *)db; - - REQUIRE(VALID_RBTDB(search.rbtdb)); - - /* - * We don't care about 'now'. - */ - UNUSED(now); - - /* - * If the caller didn't supply a version, attach to the current - * version. - */ - if (version == NULL) { - currentversion(db, &version); - close_version = ISC_TRUE; - } - - search.rbtversion = version; - search.serial = search.rbtversion->serial; - search.options = options; - search.copy_name = ISC_FALSE; - search.need_cleanup = ISC_FALSE; - search.wild = ISC_FALSE; - search.zonecut = NULL; - dns_fixedname_init(&search.zonecut_name); - dns_rbtnodechain_init(&search.chain, search.rbtdb->common.mctx); - search.now = 0; - - /* - * 'wild' will be true iff. we've matched a wildcard. - */ - wild = ISC_FALSE; - - RWLOCK(&search.rbtdb->tree_lock, isc_rwlocktype_read); - - /* - * Search down from the root of the tree. If, while going down, we - * encounter a callback node, zone_zonecut_callback() will search the - * rdatasets at the zone cut for active DNAME or NS rdatasets. - */ - result = dns_rbt_findnode(search.rbtdb->tree, name, foundname, &node, - &search.chain, DNS_RBTFIND_EMPTYDATA, - zone_zonecut_callback, &search); - - if (result == DNS_R_PARTIALMATCH) { - partial_match: - if (search.zonecut != NULL) { - result = setup_delegation(&search, nodep, foundname, - rdataset, sigrdataset); - goto tree_exit; - } - - if (search.wild) { - /* - * At least one of the levels in the search chain - * potentially has a wildcard. For each such level, - * we must see if there's a matching wildcard active - * in the current version. - */ - result = find_wildcard(&search, &node, name); - if (result == ISC_R_SUCCESS) { - result = dns_name_copy(name, foundname, NULL); - if (result != ISC_R_SUCCESS) - goto tree_exit; - wild = ISC_TRUE; - goto found; - } - else if (result != ISC_R_NOTFOUND) - goto tree_exit; - } - - chain = search.chain; - active = activeempty(&search, &chain, name); - - /* - * If we're here, then the name does not exist, is not - * beneath a zonecut, and there's no matching wildcard. - */ - if (search.rbtdb->secure || - (search.options & DNS_DBFIND_FORCENSEC) != 0) - { - result = find_closest_nsec(&search, nodep, foundname, - rdataset, sigrdataset, - search.rbtdb->secure); - if (result == ISC_R_SUCCESS) - result = active ? DNS_R_EMPTYNAME : - DNS_R_NXDOMAIN; - } else - result = active ? DNS_R_EMPTYNAME : DNS_R_NXDOMAIN; - goto tree_exit; - } else if (result != ISC_R_SUCCESS) - goto tree_exit; - - found: - /* - * We have found a node whose name is the desired name, or we - * have matched a wildcard. - */ - - if (search.zonecut != NULL) { - /* - * If we're beneath a zone cut, we don't want to look for - * CNAMEs because they're not legitimate zone glue. - */ - cname_ok = ISC_FALSE; - } else { - /* - * The node may be a zone cut itself. If it might be one, - * make sure we check for it later. - */ - if (node->find_callback && - (node != search.rbtdb->origin_node || - IS_STUB(search.rbtdb)) && - !dns_rdatatype_atparent(type)) - maybe_zonecut = ISC_TRUE; - } - - /* - * Certain DNSSEC types are not subject to CNAME matching - * (RFC 2535, section 2.3.5). - * - * We don't check for RRSIG, because we don't store RRSIG records - * directly. - */ - if (type == dns_rdatatype_dnskey || type == dns_rdatatype_nsec) - cname_ok = ISC_FALSE; - - /* - * We now go looking for rdata... - */ - - LOCK(&(search.rbtdb->node_locks[node->locknum].lock)); - - found = NULL; - foundsig = NULL; - sigtype = RBTDB_RDATATYPE_VALUE(dns_rdatatype_rrsig, type); - nsecheader = NULL; - nsecsig = NULL; - cnamesig = NULL; - empty_node = ISC_TRUE; - for (header = node->data; header != NULL; header = header_next) { - header_next = header->next; - /* - * Look for an active, extant rdataset. - */ - do { - if (header->serial <= search.serial && - !IGNORE(header)) { - /* - * Is this a "this rdataset doesn't - * exist" record? - */ - if (NONEXISTENT(header)) - header = NULL; - break; - } else - header = header->down; - } while (header != NULL); - if (header != NULL) { - /* - * We now know that there is at least one active - * rdataset at this node. - */ - empty_node = ISC_FALSE; - - /* - * Do special zone cut handling, if requested. - */ - if (maybe_zonecut && - header->type == dns_rdatatype_ns) { - /* - * We increment the reference count on node to - * ensure that search->zonecut_rdataset will - * still be valid later. - */ - new_reference(search.rbtdb, node); - search.zonecut = node; - search.zonecut_rdataset = header; - search.zonecut_sigrdataset = NULL; - search.need_cleanup = ISC_TRUE; - maybe_zonecut = ISC_FALSE; - at_zonecut = ISC_TRUE; - if ((search.options & DNS_DBFIND_GLUEOK) == 0 - && type != dns_rdatatype_nsec - && type != dns_rdatatype_dnskey) { - /* - * Glue is not OK, but any answer we - * could return would be glue. Return - * the delegation. - */ - found = NULL; - break; - } - if (found != NULL && foundsig != NULL) - break; - } - - /* - * If we found a type we were looking for, - * remember it. - */ - if (header->type == type || - type == dns_rdatatype_any || - (header->type == dns_rdatatype_cname && - cname_ok)) { - /* - * We've found the answer! - */ - found = header; - if (header->type == dns_rdatatype_cname && - cname_ok) { - /* - * We may be finding a CNAME instead - * of the desired type. - * - * If we've already got the CNAME RRSIG, - * use it, otherwise change sigtype - * so that we find it. - */ - if (cnamesig != NULL) - foundsig = cnamesig; - else - sigtype = - RBTDB_RDATATYPE_SIGCNAME; - } - /* - * If we've got all we need, end the search. - */ - if (!maybe_zonecut && foundsig != NULL) - break; - } else if (header->type == sigtype) { - /* - * We've found the RRSIG rdataset for our - * target type. Remember it. - */ - foundsig = header; - /* - * If we've got all we need, end the search. - */ - if (!maybe_zonecut && found != NULL) - break; - } else if (header->type == dns_rdatatype_nsec) { - /* - * Remember a NSEC rdataset even if we're - * not specifically looking for it, because - * we might need it later. - */ - nsecheader = header; - } else if (header->type == RBTDB_RDATATYPE_SIGNSEC) { - /* - * If we need the NSEC rdataset, we'll also - * need its signature. - */ - nsecsig = header; - } else if (cname_ok && - header->type == RBTDB_RDATATYPE_SIGCNAME) { - /* - * If we get a CNAME match, we'll also need - * its signature. - */ - cnamesig = header; - } - } - } - - if (empty_node) { - /* - * We have an exact match for the name, but there are no - * active rdatasets in the desired version. That means that - * this node doesn't exist in the desired version, and that - * we really have a partial match. - */ - if (!wild) { - UNLOCK(&(search.rbtdb->node_locks[node->locknum].lock)); - goto partial_match; - } - } - - /* - * If we didn't find what we were looking for... - */ - if (found == NULL) { - if (search.zonecut != NULL) { - /* - * We were trying to find glue at a node beneath a - * zone cut, but didn't. - * - * Return the delegation. - */ - UNLOCK(&(search.rbtdb->node_locks[node->locknum].lock)); - result = setup_delegation(&search, nodep, foundname, - rdataset, sigrdataset); - goto tree_exit; - } - /* - * The desired type doesn't exist. - */ - result = DNS_R_NXRRSET; - if (search.rbtdb->secure && - (nsecheader == NULL || nsecsig == NULL)) { - /* - * The zone is secure but there's no NSEC, - * or the NSEC has no signature! - */ - if (!wild) { - result = DNS_R_BADDB; - goto node_exit; - } - - UNLOCK(&(search.rbtdb->node_locks[node->locknum].lock)); - result = find_closest_nsec(&search, nodep, foundname, - rdataset, sigrdataset, - search.rbtdb->secure); - if (result == ISC_R_SUCCESS) - result = DNS_R_EMPTYWILD; - goto tree_exit; - } - if ((search.options & DNS_DBFIND_FORCENSEC) != 0 && - nsecheader == NULL) - { - /* - * There's no NSEC record, and we were told - * to find one. - */ - result = DNS_R_BADDB; - goto node_exit; - } - if (nodep != NULL) { - new_reference(search.rbtdb, node); - *nodep = node; - } - if (search.rbtdb->secure || - (search.options & DNS_DBFIND_FORCENSEC) != 0) - { - bind_rdataset(search.rbtdb, node, nsecheader, - 0, rdataset); - if (nsecsig != NULL) - bind_rdataset(search.rbtdb, node, - nsecsig, 0, sigrdataset); - } - if (wild) - foundname->attributes |= DNS_NAMEATTR_WILDCARD; - goto node_exit; - } - - /* - * We found what we were looking for, or we found a CNAME. - */ - - if (type != found->type && - type != dns_rdatatype_any && - found->type == dns_rdatatype_cname) { - /* - * We weren't doing an ANY query and we found a CNAME instead - * of the type we were looking for, so we need to indicate - * that result to the caller. - */ - result = DNS_R_CNAME; - } else if (search.zonecut != NULL) { - /* - * If we're beneath a zone cut, we must indicate that the - * result is glue, unless we're actually at the zone cut - * and the type is NSEC or KEY. - */ - if (search.zonecut == node) { - if (type == dns_rdatatype_nsec || - type == dns_rdatatype_dnskey) - result = ISC_R_SUCCESS; - else if (type == dns_rdatatype_any) - result = DNS_R_ZONECUT; - else - result = DNS_R_GLUE; - } else - result = DNS_R_GLUE; - /* - * We might have found data that isn't glue, but was occluded - * by a dynamic update. If the caller cares about this, they - * will have told us to validate glue. - * - * XXX We should cache the glue validity state! - */ - if (result == DNS_R_GLUE && - (search.options & DNS_DBFIND_VALIDATEGLUE) != 0 && - !valid_glue(&search, foundname, type, node)) { - UNLOCK(&(search.rbtdb->node_locks[node->locknum].lock)); - result = setup_delegation(&search, nodep, foundname, - rdataset, sigrdataset); - goto tree_exit; - } - } else { - /* - * An ordinary successful query! - */ - result = ISC_R_SUCCESS; - } - - if (nodep != NULL) { - if (!at_zonecut) - new_reference(search.rbtdb, node); - else - search.need_cleanup = ISC_FALSE; - *nodep = node; - } - - if (type != dns_rdatatype_any) { - bind_rdataset(search.rbtdb, node, found, 0, rdataset); - if (foundsig != NULL) - bind_rdataset(search.rbtdb, node, foundsig, 0, - sigrdataset); - } - - if (wild) - foundname->attributes |= DNS_NAMEATTR_WILDCARD; - - node_exit: - UNLOCK(&(search.rbtdb->node_locks[node->locknum].lock)); - - tree_exit: - RWUNLOCK(&search.rbtdb->tree_lock, isc_rwlocktype_read); - - /* - * If we found a zonecut but aren't going to use it, we have to - * let go of it. - */ - if (search.need_cleanup) { - node = search.zonecut; - lock = &(search.rbtdb->node_locks[node->locknum].lock); - - LOCK(lock); - INSIST(node->references > 0); - node->references--; - if (node->references == 0) - no_references(search.rbtdb, node, 0, - isc_rwlocktype_none); - - UNLOCK(lock); - } - - if (close_version) - closeversion(db, &version, ISC_FALSE); - - dns_rbtnodechain_reset(&search.chain); - - return (result); -} - -static isc_result_t -zone_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) -{ - UNUSED(db); - UNUSED(name); - UNUSED(options); - UNUSED(now); - UNUSED(nodep); - UNUSED(foundname); - UNUSED(rdataset); - UNUSED(sigrdataset); - - FATAL_ERROR(__FILE__, __LINE__, "zone_findzonecut() called!"); - - return (ISC_R_NOTIMPLEMENTED); -} - -static isc_result_t -cache_zonecut_callback(dns_rbtnode_t *node, dns_name_t *name, void *arg) { - rbtdb_search_t *search = arg; - rdatasetheader_t *header, *header_prev, *header_next; - rdatasetheader_t *dname_header, *sigdname_header; - isc_result_t result; - - /* XXX comment */ - - REQUIRE(search->zonecut == NULL); - - /* - * Keep compiler silent. - */ - UNUSED(name); - - LOCK(&(search->rbtdb->node_locks[node->locknum].lock)); - - /* - * Look for a DNAME or RRSIG DNAME rdataset. - */ - dname_header = NULL; - sigdname_header = NULL; - header_prev = NULL; - for (header = node->data; header != NULL; header = header_next) { - header_next = header->next; - if (header->ttl <= search->now) { - /* - * This rdataset is stale. If no one else is - * using the node, we can clean it up right - * now, otherwise we mark it as stale, and - * the node as dirty, so it will get cleaned - * up later. - */ - if (node->references == 0) { - INSIST(header->down == NULL); - if (header_prev != NULL) - header_prev->next = - header->next; - else - node->data = header->next; - free_rdataset(search->rbtdb->common.mctx, - header); - } else { - header->attributes |= - RDATASET_ATTR_STALE; - node->dirty = 1; - header_prev = header; - } - } else if (header->type == dns_rdatatype_dname && - EXISTS(header)) { - dname_header = header; - header_prev = header; - } else if (header->type == RBTDB_RDATATYPE_SIGDNAME && - EXISTS(header)) { - sigdname_header = header; - header_prev = header; - } else - header_prev = header; - } - - if (dname_header != NULL && - (dname_header->trust != dns_trust_pending || - (search->options & DNS_DBFIND_PENDINGOK) != 0)) { - /* - * We increment the reference count on node to ensure that - * search->zonecut_rdataset will still be valid later. - */ - new_reference(search->rbtdb, node); - search->zonecut = node; - search->zonecut_rdataset = dname_header; - search->zonecut_sigrdataset = sigdname_header; - search->need_cleanup = ISC_TRUE; - result = DNS_R_PARTIALMATCH; - } else - result = DNS_R_CONTINUE; - - UNLOCK(&(search->rbtdb->node_locks[node->locknum].lock)); - - return (result); -} - -static inline isc_result_t -find_deepest_zonecut(rbtdb_search_t *search, dns_rbtnode_t *node, - dns_dbnode_t **nodep, dns_name_t *foundname, - dns_rdataset_t *rdataset, dns_rdataset_t *sigrdataset) -{ - unsigned int i; - dns_rbtnode_t *level_node; - rdatasetheader_t *header, *header_prev, *header_next; - rdatasetheader_t *found, *foundsig; - isc_result_t result = ISC_R_NOTFOUND; - dns_name_t name; - dns_rbtdb_t *rbtdb; - isc_boolean_t done; - - /* - * Caller must be holding the tree lock. - */ - - rbtdb = search->rbtdb; - i = search->chain.level_matches; - done = ISC_FALSE; - do { - LOCK(&(rbtdb->node_locks[node->locknum].lock)); - - /* - * Look for NS and RRSIG NS rdatasets. - */ - found = NULL; - foundsig = NULL; - header_prev = NULL; - for (header = node->data; - header != NULL; - header = header_next) { - header_next = header->next; - if (header->ttl <= search->now) { - /* - * This rdataset is stale. If no one else is - * using the node, we can clean it up right - * now, otherwise we mark it as stale, and - * the node as dirty, so it will get cleaned - * up later. - */ - if (node->references == 0) { - INSIST(header->down == NULL); - if (header_prev != NULL) - header_prev->next = - header->next; - else - node->data = header->next; - free_rdataset(rbtdb->common.mctx, - header); - } else { - header->attributes |= - RDATASET_ATTR_STALE; - node->dirty = 1; - header_prev = header; - } - } else if (EXISTS(header)) { - /* - * We've found an extant rdataset. See if - * we're interested in it. - */ - if (header->type == dns_rdatatype_ns) { - found = header; - if (foundsig != NULL) - break; - } else if (header->type == - RBTDB_RDATATYPE_SIGNS) { - foundsig = header; - if (found != NULL) - break; - } - header_prev = header; - } else - header_prev = header; - } - - if (found != NULL) { - /* - * If we have to set foundname, we do it before - * anything else. If we were to set foundname after - * we had set nodep or bound the rdataset, then we'd - * have to undo that work if dns_name_concatenate() - * failed. By setting foundname first, there's - * nothing to undo if we have trouble. - */ - if (foundname != NULL) { - dns_name_init(&name, NULL); - dns_rbt_namefromnode(node, &name); - result = dns_name_copy(&name, foundname, NULL); - while (result == ISC_R_SUCCESS && i > 0) { - i--; - level_node = search->chain.levels[i]; - dns_name_init(&name, NULL); - dns_rbt_namefromnode(level_node, - &name); - result = - dns_name_concatenate(foundname, - &name, - foundname, - NULL); - } - if (result != ISC_R_SUCCESS) { - *nodep = NULL; - goto node_exit; - } - } - result = DNS_R_DELEGATION; - if (nodep != NULL) { - new_reference(search->rbtdb, node); - *nodep = node; - } - bind_rdataset(search->rbtdb, node, found, search->now, - rdataset); - if (foundsig != NULL) - bind_rdataset(search->rbtdb, node, foundsig, - search->now, sigrdataset); - } - - node_exit: - UNLOCK(&(search->rbtdb->node_locks[node->locknum].lock)); - - if (found == NULL && i > 0) { - i--; - node = search->chain.levels[i]; - } else - done = ISC_TRUE; - - } while (!done); - - return (result); -} - -static isc_result_t -find_coveringnsec(rbtdb_search_t *search, dns_dbnode_t **nodep, - isc_stdtime_t now, dns_name_t *foundname, - dns_rdataset_t *rdataset, dns_rdataset_t *sigrdataset) -{ - dns_rbtnode_t *node; - rdatasetheader_t *header, *header_next, *header_prev; - rdatasetheader_t *found, *foundsig; - isc_boolean_t empty_node; - isc_result_t result; - dns_fixedname_t fname, forigin; - dns_name_t *name, *origin; - rbtdb_rdatatype_t matchtype, sigmatchtype; - - matchtype = RBTDB_RDATATYPE_VALUE(dns_rdatatype_nsec, 0); - sigmatchtype = RBTDB_RDATATYPE_VALUE(dns_rdatatype_rrsig, - dns_rdatatype_nsec); - - do { - node = NULL; - dns_fixedname_init(&fname); - name = dns_fixedname_name(&fname); - dns_fixedname_init(&forigin); - origin = dns_fixedname_name(&forigin); - result = dns_rbtnodechain_current(&search->chain, name, - origin, &node); - if (result != ISC_R_SUCCESS) - return (result); - LOCK(&(search->rbtdb->node_locks[node->locknum].lock)); - found = NULL; - foundsig = NULL; - empty_node = ISC_TRUE; - header_prev = NULL; - for (header = node->data; - header != NULL; - header = header_next) { - header_next = header->next; - if (header->ttl <= now) { - /* - * This rdataset is stale. If no one else is - * using the node, we can clean it up right - * now, otherwise we mark it as stale, and the - * node as dirty, so it will get cleaned up - * later. - */ - if (header->ttl > search->now - RBTDB_VIRTUAL) - header_prev = header; - else if (node->references == 0) { - INSIST(header->down == NULL); - if (header_prev != NULL) - header_prev->next = - header->next; - else - node->data = header->next; - free_rdataset(search->rbtdb->common.mctx, - header); - } else { - header->attributes |= - RDATASET_ATTR_STALE; - node->dirty = 1; - header_prev = header; - } - continue; - } - if (NONEXISTENT(header) || NXDOMAIN(header)) { - header_prev = header; - continue; - } - empty_node = ISC_FALSE; - if (header->type == matchtype) - found = header; - else if (header->type == sigmatchtype) - foundsig = header; - header_prev = header; - } - if (found != NULL) { - result = dns_name_concatenate(name, origin, - foundname, NULL); - if (result != ISC_R_SUCCESS) - goto unlock_node; - bind_rdataset(search->rbtdb, node, found, - now, rdataset); - if (foundsig != NULL) - bind_rdataset(search->rbtdb, node, foundsig, - now, sigrdataset); - new_reference(search->rbtdb, node); - *nodep = node; - result = DNS_R_COVERINGNSEC; - } else if (!empty_node) { - result = ISC_R_NOTFOUND; - }else - result = dns_rbtnodechain_prev(&search->chain, NULL, - NULL); - unlock_node: - UNLOCK(&(search->rbtdb->node_locks[node->locknum].lock)); - } while (empty_node && result == ISC_R_SUCCESS); - return (result); -} - -static isc_result_t -cache_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) -{ - dns_rbtnode_t *node = NULL; - isc_result_t result; - rbtdb_search_t search; - isc_boolean_t cname_ok = ISC_TRUE; - isc_boolean_t empty_node; - isc_mutex_t *lock; - rdatasetheader_t *header, *header_prev, *header_next; - rdatasetheader_t *found, *nsheader; - rdatasetheader_t *foundsig, *nssig, *cnamesig; - rbtdb_rdatatype_t sigtype, nsectype; - - UNUSED(version); - - search.rbtdb = (dns_rbtdb_t *)db; - - REQUIRE(VALID_RBTDB(search.rbtdb)); - REQUIRE(version == NULL); - - if (now == 0) - isc_stdtime_get(&now); - - search.rbtversion = NULL; - search.serial = 1; - search.options = options; - search.copy_name = ISC_FALSE; - search.need_cleanup = ISC_FALSE; - search.wild = ISC_FALSE; - search.zonecut = NULL; - dns_fixedname_init(&search.zonecut_name); - dns_rbtnodechain_init(&search.chain, search.rbtdb->common.mctx); - search.now = now; - - RWLOCK(&search.rbtdb->tree_lock, isc_rwlocktype_read); - - /* - * Search down from the root of the tree. If, while going down, we - * encounter a callback node, cache_zonecut_callback() will search the - * rdatasets at the zone cut for a DNAME rdataset. - */ - result = dns_rbt_findnode(search.rbtdb->tree, name, foundname, &node, - &search.chain, DNS_RBTFIND_EMPTYDATA, - cache_zonecut_callback, &search); - - if (result == DNS_R_PARTIALMATCH) { - if ((search.options & DNS_DBFIND_COVERINGNSEC) != 0) { - result = find_coveringnsec(&search, nodep, now, - foundname, rdataset, - sigrdataset); - if (result == DNS_R_COVERINGNSEC) - goto tree_exit; - } - if (search.zonecut != NULL) { - result = setup_delegation(&search, nodep, foundname, - rdataset, sigrdataset); - goto tree_exit; - } else { - find_ns: - result = find_deepest_zonecut(&search, node, nodep, - foundname, rdataset, - sigrdataset); - goto tree_exit; - } - } else if (result != ISC_R_SUCCESS) - goto tree_exit; - - /* - * Certain DNSSEC types are not subject to CNAME matching - * (RFC 2535, section 2.3.5). - * - * We don't check for RRSIG, because we don't store RRSIG records - * directly. - */ - if (type == dns_rdatatype_dnskey || type == dns_rdatatype_nsec) - cname_ok = ISC_FALSE; - - /* - * We now go looking for rdata... - */ - - LOCK(&(search.rbtdb->node_locks[node->locknum].lock)); - - found = NULL; - foundsig = NULL; - sigtype = RBTDB_RDATATYPE_VALUE(dns_rdatatype_rrsig, type); - nsectype = RBTDB_RDATATYPE_VALUE(0, type); - nsheader = NULL; - nssig = NULL; - cnamesig = NULL; - empty_node = ISC_TRUE; - header_prev = NULL; - for (header = node->data; header != NULL; header = header_next) { - header_next = header->next; - if (header->ttl <= now) { - /* - * This rdataset is stale. If no one else is using the - * node, we can clean it up right now, otherwise we - * mark it as stale, and the node as dirty, so it will - * get cleaned up later. - */ - if (header->ttl > now - RBTDB_VIRTUAL) - header_prev = header; - else if (node->references == 0) { - INSIST(header->down == NULL); - if (header_prev != NULL) - header_prev->next = header->next; - else - node->data = header->next; - free_rdataset(search.rbtdb->common.mctx, - header); - } else { - header->attributes |= RDATASET_ATTR_STALE; - node->dirty = 1; - header_prev = header; - } - } else if (EXISTS(header)) { - /* - * We now know that there is at least one active - * non-stale rdataset at this node. - */ - empty_node = ISC_FALSE; - - /* - * If we found a type we were looking for, remember - * it. - */ - if (header->type == type || - (type == dns_rdatatype_any && - RBTDB_RDATATYPE_BASE(header->type) != 0) || - (cname_ok && header->type == - dns_rdatatype_cname)) { - /* - * We've found the answer. - */ - found = header; - if (header->type == dns_rdatatype_cname && - cname_ok && - cnamesig != NULL) { - /* - * If we've already got the CNAME RRSIG, - * use it, otherwise change sigtype - * so that we find it. - */ - if (cnamesig != NULL) - foundsig = cnamesig; - else - sigtype = - RBTDB_RDATATYPE_SIGCNAME; - foundsig = cnamesig; - } - } else if (header->type == sigtype) { - /* - * We've found the RRSIG rdataset for our - * target type. Remember it. - */ - foundsig = header; - } else if (header->type == RBTDB_RDATATYPE_NCACHEANY || - header->type == nsectype) { - /* - * We've found a negative cache entry. - */ - found = header; - } else if (header->type == dns_rdatatype_ns) { - /* - * Remember a NS rdataset even if we're - * not specifically looking for it, because - * we might need it later. - */ - nsheader = header; - } else if (header->type == RBTDB_RDATATYPE_SIGNS) { - /* - * If we need the NS rdataset, we'll also - * need its signature. - */ - nssig = header; - } else if (cname_ok && - header->type == RBTDB_RDATATYPE_SIGCNAME) { - /* - * If we get a CNAME match, we'll also need - * its signature. - */ - cnamesig = header; - } - header_prev = header; - } else - header_prev = header; - } - - if (empty_node) { - /* - * We have an exact match for the name, but there are no - * extant rdatasets. That means that this node doesn't - * meaningfully exist, and that we really have a partial match. - */ - UNLOCK(&(search.rbtdb->node_locks[node->locknum].lock)); - goto find_ns; - } - - /* - * If we didn't find what we were looking for... - */ - if (found == NULL || - (found->trust == dns_trust_glue && - ((options & DNS_DBFIND_GLUEOK) == 0)) || - (found->trust == dns_trust_pending && - ((options & DNS_DBFIND_PENDINGOK) == 0))) { - /* - * If there is an NS rdataset at this node, then this is the - * deepest zone cut. - */ - if (nsheader != NULL) { - if (nodep != NULL) { - new_reference(search.rbtdb, node); - *nodep = node; - } - bind_rdataset(search.rbtdb, node, nsheader, search.now, - rdataset); - if (nssig != NULL) - bind_rdataset(search.rbtdb, node, nssig, - search.now, sigrdataset); - result = DNS_R_DELEGATION; - goto node_exit; - } - - /* - * Go find the deepest zone cut. - */ - UNLOCK(&(search.rbtdb->node_locks[node->locknum].lock)); - goto find_ns; - } - - /* - * We found what we were looking for, or we found a CNAME. - */ - - if (nodep != NULL) { - new_reference(search.rbtdb, node); - *nodep = node; - } - - if (RBTDB_RDATATYPE_BASE(found->type) == 0) { - /* - * We found a negative cache entry. - */ - if (NXDOMAIN(found)) - result = DNS_R_NCACHENXDOMAIN; - else - result = DNS_R_NCACHENXRRSET; - } else if (type != found->type && - type != dns_rdatatype_any && - found->type == dns_rdatatype_cname) { - /* - * We weren't doing an ANY query and we found a CNAME instead - * of the type we were looking for, so we need to indicate - * that result to the caller. - */ - result = DNS_R_CNAME; - } else { - /* - * An ordinary successful query! - */ - result = ISC_R_SUCCESS; - } - - if (type != dns_rdatatype_any || result == DNS_R_NCACHENXDOMAIN || - result == DNS_R_NCACHENXRRSET) { - bind_rdataset(search.rbtdb, node, found, search.now, - rdataset); - if (foundsig != NULL) - bind_rdataset(search.rbtdb, node, foundsig, search.now, - sigrdataset); - } - - node_exit: - UNLOCK(&(search.rbtdb->node_locks[node->locknum].lock)); - - tree_exit: - RWUNLOCK(&search.rbtdb->tree_lock, isc_rwlocktype_read); - - /* - * If we found a zonecut but aren't going to use it, we have to - * let go of it. - */ - if (search.need_cleanup) { - node = search.zonecut; - lock = &(search.rbtdb->node_locks[node->locknum].lock); - - LOCK(lock); - INSIST(node->references > 0); - node->references--; - if (node->references == 0) - no_references(search.rbtdb, node, 0, - isc_rwlocktype_none); - UNLOCK(lock); - } - - dns_rbtnodechain_reset(&search.chain); - - return (result); -} - -static isc_result_t -cache_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) -{ - dns_rbtnode_t *node = NULL; - isc_result_t result; - rbtdb_search_t search; - rdatasetheader_t *header, *header_prev, *header_next; - rdatasetheader_t *found, *foundsig; - unsigned int rbtoptions = DNS_RBTFIND_EMPTYDATA; - - search.rbtdb = (dns_rbtdb_t *)db; - - REQUIRE(VALID_RBTDB(search.rbtdb)); - - if (now == 0) - isc_stdtime_get(&now); - - search.rbtversion = NULL; - search.serial = 1; - search.options = options; - search.copy_name = ISC_FALSE; - search.need_cleanup = ISC_FALSE; - search.wild = ISC_FALSE; - search.zonecut = NULL; - dns_fixedname_init(&search.zonecut_name); - dns_rbtnodechain_init(&search.chain, search.rbtdb->common.mctx); - search.now = now; - - if ((options & DNS_DBFIND_NOEXACT) != 0) - rbtoptions |= DNS_RBTFIND_NOEXACT; - - RWLOCK(&search.rbtdb->tree_lock, isc_rwlocktype_read); - - /* - * Search down from the root of the tree. - */ - result = dns_rbt_findnode(search.rbtdb->tree, name, foundname, &node, - &search.chain, rbtoptions, NULL, &search); - - if (result == DNS_R_PARTIALMATCH) { - find_ns: - result = find_deepest_zonecut(&search, node, nodep, foundname, - rdataset, sigrdataset); - goto tree_exit; - } else if (result != ISC_R_SUCCESS) - goto tree_exit; - - /* - * We now go looking for an NS rdataset at the node. - */ - - LOCK(&(search.rbtdb->node_locks[node->locknum].lock)); - - found = NULL; - foundsig = NULL; - header_prev = NULL; - for (header = node->data; header != NULL; header = header_next) { - header_next = header->next; - if (header->ttl <= now) { - /* - * This rdataset is stale. If no one else is using the - * node, we can clean it up right now, otherwise we - * mark it as stale, and the node as dirty, so it will - * get cleaned up later. - */ - if (header->ttl > now - RBTDB_VIRTUAL) - header_prev = header; - else if (node->references == 0) { - INSIST(header->down == NULL); - if (header_prev != NULL) - header_prev->next = header->next; - else - node->data = header->next; - free_rdataset(search.rbtdb->common.mctx, - header); - } else { - header->attributes |= RDATASET_ATTR_STALE; - node->dirty = 1; - header_prev = header; - } - } else if (EXISTS(header)) { - /* - * If we found a type we were looking for, remember - * it. - */ - if (header->type == dns_rdatatype_ns) { - /* - * Remember a NS rdataset even if we're - * not specifically looking for it, because - * we might need it later. - */ - found = header; - } else if (header->type == RBTDB_RDATATYPE_SIGNS) { - /* - * If we need the NS rdataset, we'll also - * need its signature. - */ - foundsig = header; - } - header_prev = header; - } else - header_prev = header; - } - - if (found == NULL) { - /* - * No NS records here. - */ - UNLOCK(&(search.rbtdb->node_locks[node->locknum].lock)); - goto find_ns; - } - - if (nodep != NULL) { - new_reference(search.rbtdb, node); - *nodep = node; - } - - bind_rdataset(search.rbtdb, node, found, search.now, rdataset); - if (foundsig != NULL) - bind_rdataset(search.rbtdb, node, foundsig, search.now, - sigrdataset); - - UNLOCK(&(search.rbtdb->node_locks[node->locknum].lock)); - - tree_exit: - RWUNLOCK(&search.rbtdb->tree_lock, isc_rwlocktype_read); - - INSIST(!search.need_cleanup); - - dns_rbtnodechain_reset(&search.chain); - - if (result == DNS_R_DELEGATION) - result = ISC_R_SUCCESS; - - return (result); -} - -static void -attachnode(dns_db_t *db, dns_dbnode_t *source, dns_dbnode_t **targetp) { - dns_rbtdb_t *rbtdb = (dns_rbtdb_t *)db; - dns_rbtnode_t *node = (dns_rbtnode_t *)source; - - REQUIRE(VALID_RBTDB(rbtdb)); - REQUIRE(targetp != NULL && *targetp == NULL); - - LOCK(&rbtdb->node_locks[node->locknum].lock); - INSIST(node->references > 0); - node->references++; - INSIST(node->references != 0); /* Catch overflow. */ - UNLOCK(&rbtdb->node_locks[node->locknum].lock); - - *targetp = source; -} - -static void -detachnode(dns_db_t *db, dns_dbnode_t **targetp) { - dns_rbtdb_t *rbtdb = (dns_rbtdb_t *)db; - dns_rbtnode_t *node; - isc_boolean_t want_free = ISC_FALSE; - isc_boolean_t inactive = ISC_FALSE; - unsigned int locknum; - - REQUIRE(VALID_RBTDB(rbtdb)); - REQUIRE(targetp != NULL && *targetp != NULL); - - node = (dns_rbtnode_t *)(*targetp); - locknum = node->locknum; - - LOCK(&rbtdb->node_locks[locknum].lock); - - INSIST(node->references > 0); - node->references--; - if (node->references == 0) { - no_references(rbtdb, node, 0, isc_rwlocktype_none); - if (rbtdb->node_locks[locknum].references == 0 && - rbtdb->node_locks[locknum].exiting) - inactive = ISC_TRUE; - } - - UNLOCK(&rbtdb->node_locks[locknum].lock); - - *targetp = NULL; - - if (inactive) { - LOCK(&rbtdb->lock); - rbtdb->active--; - if (rbtdb->active == 0) - want_free = ISC_TRUE; - UNLOCK(&rbtdb->lock); - if (want_free) { - char buf[DNS_NAME_FORMATSIZE]; - if (dns_name_dynamic(&rbtdb->common.origin)) - dns_name_format(&rbtdb->common.origin, buf, - sizeof(buf)); - else - strcpy(buf, "<UNKNOWN>"); - isc_log_write(dns_lctx, DNS_LOGCATEGORY_DATABASE, - DNS_LOGMODULE_CACHE, ISC_LOG_DEBUG(1), - "calling free_rbtdb(%s)", buf); - free_rbtdb(rbtdb, ISC_TRUE, NULL); - } - } -} - -static isc_result_t -expirenode(dns_db_t *db, dns_dbnode_t *node, isc_stdtime_t now) { - dns_rbtdb_t *rbtdb = (dns_rbtdb_t *)db; - dns_rbtnode_t *rbtnode = node; - rdatasetheader_t *header; - isc_boolean_t force_expire = ISC_FALSE; - /* - * These are the category and module used by the cache cleaner. - */ - isc_boolean_t log = ISC_FALSE; - isc_logcategory_t *category = DNS_LOGCATEGORY_DATABASE; - isc_logmodule_t *module = DNS_LOGMODULE_CACHE; - int level = ISC_LOG_DEBUG(2); - char printname[DNS_NAME_FORMATSIZE]; - - REQUIRE(VALID_RBTDB(rbtdb)); - - /* - * Caller must hold a tree lock. - */ - - if (now == 0) - isc_stdtime_get(&now); - - if (rbtdb->overmem) { - isc_uint32_t val; - - isc_random_get(&val); - /* - * XXXDCL Could stand to have a better policy, like LRU. - */ - force_expire = ISC_TF(rbtnode->down == NULL && val % 4 == 0); - - /* - * Note that 'log' can be true IFF rbtdb->overmem is also true. - * rbtdb->ovemem can currently only be true for cache databases - * -- hence all of the "overmem cache" log strings. - */ - log = ISC_TF(isc_log_wouldlog(dns_lctx, level)); - if (log) - isc_log_write(dns_lctx, category, module, level, - "overmem cache: %s %s", - force_expire ? "FORCE" : "check", - dns_rbt_formatnodename(rbtnode, - printname, - sizeof(printname))); - } - - LOCK(&rbtdb->node_locks[rbtnode->locknum].lock); - - for (header = rbtnode->data; header != NULL; header = header->next) - if (header->ttl <= now - RBTDB_VIRTUAL) { - /* - * We don't check if rbtnode->references == 0 and try - * to free like we do in cache_find(), because - * rbtnode->references must be non-zero. This is so - * because 'node' is an argument to the function. - */ - header->attributes |= RDATASET_ATTR_STALE; - rbtnode->dirty = 1; - if (log) - isc_log_write(dns_lctx, category, module, - level, "overmem cache: stale %s", - printname); - } else if (force_expire) { - if (! RETAIN(header)) { - header->ttl = 0; - header->attributes |= RDATASET_ATTR_STALE; - rbtnode->dirty = 1; - } else if (log) { - isc_log_write(dns_lctx, category, module, - level, "overmem cache: " - "reprieve by RETAIN() %s", - printname); - } - } else if (rbtdb->overmem && log) - isc_log_write(dns_lctx, category, module, level, - "overmem cache: saved %s", printname); - - UNLOCK(&rbtdb->node_locks[rbtnode->locknum].lock); - - return (ISC_R_SUCCESS); -} - -static void -overmem(dns_db_t *db, isc_boolean_t overmem) { - dns_rbtdb_t *rbtdb = (dns_rbtdb_t *)db; - - if (IS_CACHE(rbtdb)) { - rbtdb->overmem = overmem; - } -} - -static void -printnode(dns_db_t *db, dns_dbnode_t *node, FILE *out) { - dns_rbtdb_t *rbtdb = (dns_rbtdb_t *)db; - dns_rbtnode_t *rbtnode = node; - isc_boolean_t first; - - REQUIRE(VALID_RBTDB(rbtdb)); - - LOCK(&rbtdb->node_locks[rbtnode->locknum].lock); - - fprintf(out, "node %p, %u references, locknum = %u\n", - rbtnode, rbtnode->references, rbtnode->locknum); - if (rbtnode->data != NULL) { - rdatasetheader_t *current, *top_next; - - for (current = rbtnode->data; current != NULL; - current = top_next) { - top_next = current->next; - first = ISC_TRUE; - fprintf(out, "\ttype %u", current->type); - do { - if (!first) - fprintf(out, "\t"); - first = ISC_FALSE; - fprintf(out, - "\tserial = %lu, ttl = %u, " - "trust = %u, attributes = %u\n", - (unsigned long)current->serial, - current->ttl, - current->trust, - current->attributes); - current = current->down; - } while (current != NULL); - } - } else - fprintf(out, "(empty)\n"); - - UNLOCK(&rbtdb->node_locks[rbtnode->locknum].lock); -} - -static isc_result_t -createiterator(dns_db_t *db, isc_boolean_t relative_names, - dns_dbiterator_t **iteratorp) -{ - dns_rbtdb_t *rbtdb = (dns_rbtdb_t *)db; - rbtdb_dbiterator_t *rbtdbiter; - - REQUIRE(VALID_RBTDB(rbtdb)); - - rbtdbiter = isc_mem_get(rbtdb->common.mctx, sizeof(*rbtdbiter)); - if (rbtdbiter == NULL) - return (ISC_R_NOMEMORY); - - rbtdbiter->common.methods = &dbiterator_methods; - rbtdbiter->common.db = NULL; - dns_db_attach(db, &rbtdbiter->common.db); - rbtdbiter->common.relative_names = relative_names; - rbtdbiter->common.magic = DNS_DBITERATOR_MAGIC; - rbtdbiter->common.cleaning = ISC_FALSE; - rbtdbiter->paused = ISC_TRUE; - rbtdbiter->tree_locked = isc_rwlocktype_none; - rbtdbiter->result = ISC_R_SUCCESS; - dns_fixedname_init(&rbtdbiter->name); - dns_fixedname_init(&rbtdbiter->origin); - rbtdbiter->node = NULL; - rbtdbiter->delete = 0; - memset(rbtdbiter->deletions, 0, sizeof(rbtdbiter->deletions)); - dns_rbtnodechain_init(&rbtdbiter->chain, db->mctx); - - *iteratorp = (dns_dbiterator_t *)rbtdbiter; - - return (ISC_R_SUCCESS); -} - -static isc_result_t -zone_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) -{ - dns_rbtdb_t *rbtdb = (dns_rbtdb_t *)db; - dns_rbtnode_t *rbtnode = (dns_rbtnode_t *)node; - rdatasetheader_t *header, *header_next, *found, *foundsig; - rbtdb_serial_t serial; - rbtdb_version_t *rbtversion = version; - isc_boolean_t close_version = ISC_FALSE; - rbtdb_rdatatype_t matchtype, sigmatchtype; - - REQUIRE(VALID_RBTDB(rbtdb)); - REQUIRE(type != dns_rdatatype_any); - - if (rbtversion == NULL) { - currentversion(db, (dns_dbversion_t **) (void *)(&rbtversion)); - close_version = ISC_TRUE; - } - serial = rbtversion->serial; - now = 0; - - LOCK(&rbtdb->node_locks[rbtnode->locknum].lock); - - found = NULL; - foundsig = NULL; - matchtype = RBTDB_RDATATYPE_VALUE(type, covers); - if (covers == 0) - sigmatchtype = RBTDB_RDATATYPE_VALUE(dns_rdatatype_rrsig, type); - else - sigmatchtype = 0; - - for (header = rbtnode->data; header != NULL; header = header_next) { - header_next = header->next; - do { - if (header->serial <= serial && - !IGNORE(header)) { - /* - * Is this a "this rdataset doesn't - * exist" record? - */ - if (NONEXISTENT(header)) - header = NULL; - break; - } else - header = header->down; - } while (header != NULL); - if (header != NULL) { - /* - * We have an active, extant rdataset. If it's a - * type we're looking for, remember it. - */ - if (header->type == matchtype) { - found = header; - if (foundsig != NULL) - break; - } else if (header->type == sigmatchtype) { - foundsig = header; - if (found != NULL) - break; - } - } - } - if (found != NULL) { - bind_rdataset(rbtdb, rbtnode, found, now, rdataset); - if (foundsig != NULL) - bind_rdataset(rbtdb, rbtnode, foundsig, now, - sigrdataset); - } - - UNLOCK(&rbtdb->node_locks[rbtnode->locknum].lock); - - if (close_version) - closeversion(db, (dns_dbversion_t **) (void *)(&rbtversion), - ISC_FALSE); - - if (found == NULL) - return (ISC_R_NOTFOUND); - - return (ISC_R_SUCCESS); -} - -static isc_result_t -cache_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) -{ - dns_rbtdb_t *rbtdb = (dns_rbtdb_t *)db; - dns_rbtnode_t *rbtnode = (dns_rbtnode_t *)node; - rdatasetheader_t *header, *header_next, *found, *foundsig; - rbtdb_rdatatype_t matchtype, sigmatchtype, nsectype; - isc_result_t result; - - REQUIRE(VALID_RBTDB(rbtdb)); - REQUIRE(type != dns_rdatatype_any); - - UNUSED(version); - - result = ISC_R_SUCCESS; - - if (now == 0) - isc_stdtime_get(&now); - - LOCK(&rbtdb->node_locks[rbtnode->locknum].lock); - - found = NULL; - foundsig = NULL; - matchtype = RBTDB_RDATATYPE_VALUE(type, covers); - nsectype = RBTDB_RDATATYPE_VALUE(0, type); - if (covers == 0) - sigmatchtype = RBTDB_RDATATYPE_VALUE(dns_rdatatype_rrsig, type); - else - sigmatchtype = 0; - - for (header = rbtnode->data; header != NULL; header = header_next) { - header_next = header->next; - if (header->ttl <= now) { - /* - * We don't check if rbtnode->references == 0 and try - * to free like we do in cache_find(), because - * rbtnode->references must be non-zero. This is so - * because 'node' is an argument to the function. - */ - if (header->ttl <= now - RBTDB_VIRTUAL) { - header->attributes |= RDATASET_ATTR_STALE; - rbtnode->dirty = 1; - } - } else if (EXISTS(header)) { - if (header->type == matchtype) - found = header; - else if (header->type == RBTDB_RDATATYPE_NCACHEANY || - header->type == nsectype) - found = header; - else if (header->type == sigmatchtype) - foundsig = header; - } - } - if (found != NULL) { - bind_rdataset(rbtdb, rbtnode, found, now, rdataset); - if (foundsig != NULL) - bind_rdataset(rbtdb, rbtnode, foundsig, now, - sigrdataset); - } - - UNLOCK(&rbtdb->node_locks[rbtnode->locknum].lock); - - if (found == NULL) - return (ISC_R_NOTFOUND); - - if (RBTDB_RDATATYPE_BASE(found->type) == 0) { - /* - * We found a negative cache entry. - */ - if (NXDOMAIN(found)) - result = DNS_R_NCACHENXDOMAIN; - else - result = DNS_R_NCACHENXRRSET; - } - - return (result); -} - -static isc_result_t -allrdatasets(dns_db_t *db, dns_dbnode_t *node, dns_dbversion_t *version, - isc_stdtime_t now, dns_rdatasetiter_t **iteratorp) -{ - dns_rbtdb_t *rbtdb = (dns_rbtdb_t *)db; - dns_rbtnode_t *rbtnode = (dns_rbtnode_t *)node; - rbtdb_version_t *rbtversion = version; - rbtdb_rdatasetiter_t *iterator; - - REQUIRE(VALID_RBTDB(rbtdb)); - - iterator = isc_mem_get(rbtdb->common.mctx, sizeof(*iterator)); - if (iterator == NULL) - return (ISC_R_NOMEMORY); - - if ((db->attributes & DNS_DBATTR_CACHE) == 0) { - now = 0; - if (rbtversion == NULL) - currentversion(db, - (dns_dbversion_t **) (void *)(&rbtversion)); - else { - LOCK(&rbtdb->lock); - INSIST(rbtversion->references > 0); - rbtversion->references++; - INSIST(rbtversion->references != 0); - UNLOCK(&rbtdb->lock); - } - } else { - if (now == 0) - isc_stdtime_get(&now); - rbtversion = NULL; - } - - iterator->common.magic = DNS_RDATASETITER_MAGIC; - iterator->common.methods = &rdatasetiter_methods; - iterator->common.db = db; - iterator->common.node = node; - iterator->common.version = (dns_dbversion_t *)rbtversion; - iterator->common.now = now; - - LOCK(&rbtdb->node_locks[rbtnode->locknum].lock); - - INSIST(rbtnode->references > 0); - rbtnode->references++; - INSIST(rbtnode->references != 0); - iterator->current = NULL; - - UNLOCK(&rbtdb->node_locks[rbtnode->locknum].lock); - - *iteratorp = (dns_rdatasetiter_t *)iterator; - - return (ISC_R_SUCCESS); -} - -static isc_boolean_t -cname_and_other_data(dns_rbtnode_t *node, rbtdb_serial_t serial) { - rdatasetheader_t *header, *header_next; - isc_boolean_t cname, other_data; - dns_rdatatype_t rdtype; - - /* - * The caller must hold the node lock. - */ - - /* - * Look for CNAME and "other data" rdatasets active in our version. - */ - cname = ISC_FALSE; - other_data = ISC_FALSE; - for (header = node->data; header != NULL; header = header_next) { - header_next = header->next; - if (header->type == dns_rdatatype_cname) { - /* - * Look for an active extant CNAME. - */ - do { - if (header->serial <= serial && - !IGNORE(header)) { - /* - * Is this a "this rdataset doesn't - * exist" record? - */ - if (NONEXISTENT(header)) - header = NULL; - break; - } else - header = header->down; - } while (header != NULL); - if (header != NULL) - cname = ISC_TRUE; - } else { - /* - * Look for active extant "other data". - * - * "Other data" is any rdataset whose type is not - * DNSKEY, RRSIG DNSKEY, NSEC, RRSIG NSEC, - * or RRSIG CNAME. - */ - rdtype = RBTDB_RDATATYPE_BASE(header->type); - if (rdtype == dns_rdatatype_rrsig || - rdtype == dns_rdatatype_sig) - rdtype = RBTDB_RDATATYPE_EXT(header->type); - if (rdtype != dns_rdatatype_nsec && - rdtype != dns_rdatatype_dnskey && - rdtype != dns_rdatatype_nxt && - rdtype != dns_rdatatype_key && - rdtype != dns_rdatatype_cname) { - /* - * We've found a type that isn't - * NSEC, KEY, CNAME, or one of their - * signatures. Is it active and extant? - */ - do { - if (header->serial <= serial && - !IGNORE(header)) { - /* - * Is this a "this rdataset - * doesn't exist" record? - */ - if (NONEXISTENT(header)) - header = NULL; - break; - } else - header = header->down; - } while (header != NULL); - if (header != NULL) - other_data = ISC_TRUE; - } - } - } - - if (cname && other_data) - return (ISC_TRUE); - - return (ISC_FALSE); -} - -static isc_result_t -add(dns_rbtdb_t *rbtdb, dns_rbtnode_t *rbtnode, rbtdb_version_t *rbtversion, - rdatasetheader_t *newheader, unsigned int options, isc_boolean_t loading, - dns_rdataset_t *addedrdataset, isc_stdtime_t now) -{ - rbtdb_changed_t *changed = NULL; - rdatasetheader_t *topheader, *topheader_prev, *header; - unsigned char *merged; - isc_result_t result; - isc_boolean_t header_nx; - isc_boolean_t newheader_nx; - isc_boolean_t merge; - dns_rdatatype_t nsectype, rdtype, covers; - dns_trust_t trust; - - /* - * Add an rdatasetheader_t to a node. - */ - - /* - * Caller must be holding the node lock. - */ - - if ((options & DNS_DBADD_MERGE) != 0) { - REQUIRE(rbtversion != NULL); - merge = ISC_TRUE; - } else - merge = ISC_FALSE; - - if ((options & DNS_DBADD_FORCE) != 0) - trust = dns_trust_ultimate; - else - trust = newheader->trust; - - if (rbtversion != NULL && !loading) { - /* - * We always add a changed record, even if no changes end up - * being made to this node, because it's harmless and - * simplifies the code. - */ - changed = add_changed(rbtdb, rbtversion, rbtnode); - if (changed == NULL) { - free_rdataset(rbtdb->common.mctx, newheader); - return (ISC_R_NOMEMORY); - } - } - - newheader_nx = NONEXISTENT(newheader) ? ISC_TRUE : ISC_FALSE; - topheader_prev = NULL; - - nsectype = 0; - if (rbtversion == NULL && !newheader_nx) { - rdtype = RBTDB_RDATATYPE_BASE(newheader->type); - if (rdtype == 0) { - /* - * We're adding a negative cache entry. - */ - covers = RBTDB_RDATATYPE_EXT(newheader->type); - if (covers == dns_rdatatype_any) { - /* - * We're adding an NXDOMAIN negative cache - * entry. - * - * We make all other data stale so that the - * only rdataset that can be found at this - * node is the NXDOMAIN negative cache entry. - */ - for (topheader = rbtnode->data; - topheader != NULL; - topheader = topheader->next) { - topheader->ttl = 0; - topheader->attributes |= - RDATASET_ATTR_STALE; - } - rbtnode->dirty = 1; - goto find_header; - } - nsectype = RBTDB_RDATATYPE_VALUE(covers, 0); - } else { - /* - * We're adding something that isn't a - * negative cache entry. Look for an extant - * non-stale NXDOMAIN negative cache entry. - */ - for (topheader = rbtnode->data; - topheader != NULL; - topheader = topheader->next) { - if (NXDOMAIN(topheader)) - break; - } - if (topheader != NULL && EXISTS(topheader) && - topheader->ttl > now) { - /* - * Found one. - */ - if (trust < topheader->trust) { - /* - * The NXDOMAIN is more trusted. - */ - free_rdataset(rbtdb->common.mctx, - newheader); - if (addedrdataset != NULL) - bind_rdataset(rbtdb, rbtnode, - topheader, now, - addedrdataset); - return (DNS_R_UNCHANGED); - } - /* - * The new rdataset is better. Expire the - * NXDOMAIN. - */ - topheader->ttl = 0; - topheader->attributes |= RDATASET_ATTR_STALE; - rbtnode->dirty = 1; - topheader = NULL; - goto find_header; - } - nsectype = RBTDB_RDATATYPE_VALUE(0, rdtype); - } - } - - for (topheader = rbtnode->data; - topheader != NULL; - topheader = topheader->next) { - if (topheader->type == newheader->type || - topheader->type == nsectype) - break; - topheader_prev = topheader; - } - - find_header: - /* - * If header isn't NULL, we've found the right type. There may be - * IGNORE rdatasets between the top of the chain and the first real - * data. We skip over them. - */ - header = topheader; - while (header != NULL && IGNORE(header)) - header = header->down; - if (header != NULL) { - header_nx = NONEXISTENT(header) ? ISC_TRUE : ISC_FALSE; - - /* - * Deleting an already non-existent rdataset has no effect. - */ - if (header_nx && newheader_nx) { - free_rdataset(rbtdb->common.mctx, newheader); - return (DNS_R_UNCHANGED); - } - - /* - * Trying to add an rdataset with lower trust to a cache DB - * has no effect, provided that the cache data isn't stale. - */ - if (rbtversion == NULL && trust < header->trust && - (header->ttl > now || header_nx)) { - free_rdataset(rbtdb->common.mctx, newheader); - if (addedrdataset != NULL) - bind_rdataset(rbtdb, rbtnode, header, now, - addedrdataset); - return (DNS_R_UNCHANGED); - } - - /* - * Don't merge if a nonexistent rdataset is involved. - */ - if (merge && (header_nx || newheader_nx)) - merge = ISC_FALSE; - - /* - * If 'merge' is ISC_TRUE, we'll try to create a new rdataset - * that is the union of 'newheader' and 'header'. - */ - if (merge) { - unsigned int flags = 0; - INSIST(rbtversion->serial >= header->serial); - merged = NULL; - result = ISC_R_SUCCESS; - - if ((options & DNS_DBADD_EXACT) != 0) - flags |= DNS_RDATASLAB_EXACT; - if ((options & DNS_DBADD_EXACTTTL) != 0 && - newheader->ttl != header->ttl) - result = DNS_R_NOTEXACT; - else if (newheader->ttl != header->ttl) - flags |= DNS_RDATASLAB_FORCE; - if (result == ISC_R_SUCCESS) - result = dns_rdataslab_merge( - (unsigned char *)header, - (unsigned char *)newheader, - (unsigned int)(sizeof(*newheader)), - rbtdb->common.mctx, - rbtdb->common.rdclass, - (dns_rdatatype_t)header->type, - flags, &merged); - if (result == ISC_R_SUCCESS) { - /* - * If 'header' has the same serial number as - * we do, we could clean it up now if we knew - * that our caller had no references to it. - * We don't know this, however, so we leave it - * alone. It will get cleaned up when - * clean_zone_node() runs. - */ - free_rdataset(rbtdb->common.mctx, newheader); - newheader = (rdatasetheader_t *)merged; - } else { - free_rdataset(rbtdb->common.mctx, newheader); - return (result); - } - } - /* - * Don't replace existing NS, A and AAAA RRsets - * in the cache if they are already exist. This - * prevents named being locked to old servers. - * Don't lower trust of existing record if the - * update is forced. - */ - if (IS_CACHE(rbtdb) && header->ttl > now && - header->type == dns_rdatatype_ns && - !header_nx && !newheader_nx && - header->trust >= newheader->trust && - dns_rdataslab_equalx((unsigned char *)header, - (unsigned char *)newheader, - (unsigned int)(sizeof(*newheader)), - rbtdb->common.rdclass, - (dns_rdatatype_t)header->type)) { - /* - * Honour the new ttl if it is less than the - * older one. - */ - if (header->ttl > newheader->ttl) - header->ttl = newheader->ttl; - if (header->noqname == NULL && - newheader->noqname != NULL) { - header->noqname = newheader->noqname; - newheader->noqname = NULL; - } - free_rdataset(rbtdb->common.mctx, newheader); - if (addedrdataset != NULL) - bind_rdataset(rbtdb, rbtnode, header, now, - addedrdataset); - return (ISC_R_SUCCESS); - } - if (IS_CACHE(rbtdb) && header->ttl > now && - (header->type == dns_rdatatype_a || - header->type == dns_rdatatype_aaaa) && - !header_nx && !newheader_nx && - header->trust >= newheader->trust && - dns_rdataslab_equal((unsigned char *)header, - (unsigned char *)newheader, - (unsigned int)(sizeof(*newheader)))) { - /* - * Honour the new ttl if it is less than the - * older one. - */ - if (header->ttl > newheader->ttl) - header->ttl = newheader->ttl; - if (header->noqname == NULL && - newheader->noqname != NULL) { - header->noqname = newheader->noqname; - newheader->noqname = NULL; - } - free_rdataset(rbtdb->common.mctx, newheader); - if (addedrdataset != NULL) - bind_rdataset(rbtdb, rbtnode, header, now, - addedrdataset); - return (ISC_R_SUCCESS); - } - INSIST(rbtversion == NULL || - rbtversion->serial >= topheader->serial); - if (topheader_prev != NULL) - topheader_prev->next = newheader; - else - rbtnode->data = newheader; - newheader->next = topheader->next; - if (loading) { - /* - * There are no other references to 'header' when - * loading, so we MAY clean up 'header' now. - * Since we don't generate changed records when - * loading, we MUST clean up 'header' now. - */ - newheader->down = NULL; - free_rdataset(rbtdb->common.mctx, header); - } else { - newheader->down = topheader; - topheader->next = newheader; - rbtnode->dirty = 1; - if (changed != NULL) - changed->dirty = ISC_TRUE; - } - } else { - /* - * No non-IGNORED rdatasets of the given type exist at - * this node. - */ - - /* - * If we're trying to delete the type, don't bother. - */ - if (newheader_nx) { - free_rdataset(rbtdb->common.mctx, newheader); - return (DNS_R_UNCHANGED); - } - - if (topheader != NULL) { - /* - * We have an list of rdatasets of the given type, - * but they're all marked IGNORE. We simply insert - * the new rdataset at the head of the list. - * - * Ignored rdatasets cannot occur during loading, so - * we INSIST on it. - */ - INSIST(!loading); - INSIST(rbtversion == NULL || - rbtversion->serial >= topheader->serial); - if (topheader_prev != NULL) - topheader_prev->next = newheader; - else - rbtnode->data = newheader; - newheader->next = topheader->next; - newheader->down = topheader; - topheader->next = newheader; - rbtnode->dirty = 1; - if (changed != NULL) - changed->dirty = ISC_TRUE; - } else { - /* - * No rdatasets of the given type exist at the node. - */ - newheader->next = rbtnode->data; - newheader->down = NULL; - rbtnode->data = newheader; - } - } - - /* - * Check if the node now contains CNAME and other data. - */ - if (rbtversion != NULL && - cname_and_other_data(rbtnode, rbtversion->serial)) - return (DNS_R_CNAMEANDOTHER); - - if (addedrdataset != NULL) - bind_rdataset(rbtdb, rbtnode, newheader, now, addedrdataset); - - return (ISC_R_SUCCESS); -} - -static inline isc_boolean_t -delegating_type(dns_rbtdb_t *rbtdb, dns_rbtnode_t *node, - rbtdb_rdatatype_t type) -{ - if (IS_CACHE(rbtdb)) { - if (type == dns_rdatatype_dname) - return (ISC_TRUE); - else - return (ISC_FALSE); - } else if (type == dns_rdatatype_dname || - (type == dns_rdatatype_ns && - (node != rbtdb->origin_node || IS_STUB(rbtdb)))) - return (ISC_TRUE); - return (ISC_FALSE); -} - -static inline isc_result_t -addnoqname(dns_rbtdb_t *rbtdb, rdatasetheader_t *newheader, - dns_rdataset_t *rdataset) -{ - struct noqname *noqname; - isc_mem_t *mctx = rbtdb->common.mctx; - dns_name_t name; - dns_rdataset_t nsec, nsecsig; - isc_result_t result; - isc_region_t r; - - dns_name_init(&name, NULL); - dns_rdataset_init(&nsec); - dns_rdataset_init(&nsecsig); - - result = dns_rdataset_getnoqname(rdataset, &name, &nsec, &nsecsig); - RUNTIME_CHECK(result == ISC_R_SUCCESS); - - noqname = isc_mem_get(mctx, sizeof(*noqname)); - if (noqname == NULL) { - result = ISC_R_NOMEMORY; - goto cleanup; - } - dns_name_init(&noqname->name, NULL); - noqname->nsec = NULL; - noqname->nsecsig = NULL; - result = dns_name_dup(&name, mctx, &noqname->name); - if (result != ISC_R_SUCCESS) - goto cleanup; - result = dns_rdataslab_fromrdataset(&nsec, mctx, &r, 0); - if (result != ISC_R_SUCCESS) - goto cleanup; - noqname->nsec = r.base; - result = dns_rdataslab_fromrdataset(&nsecsig, mctx, &r, 0); - if (result != ISC_R_SUCCESS) - goto cleanup; - noqname->nsecsig = r.base; - dns_rdataset_disassociate(&nsec); - dns_rdataset_disassociate(&nsecsig); - newheader->noqname = noqname; - return (ISC_R_SUCCESS); - -cleanup: - dns_rdataset_disassociate(&nsec); - dns_rdataset_disassociate(&nsecsig); - free_noqname(mctx, &noqname); - return(result); -} - -static 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) -{ - dns_rbtdb_t *rbtdb = (dns_rbtdb_t *)db; - dns_rbtnode_t *rbtnode = (dns_rbtnode_t *)node; - rbtdb_version_t *rbtversion = version; - isc_region_t region; - rdatasetheader_t *newheader; - isc_result_t result; - isc_boolean_t delegating; - - REQUIRE(VALID_RBTDB(rbtdb)); - - if (rbtversion == NULL) { - if (now == 0) - isc_stdtime_get(&now); - } else - now = 0; - - result = dns_rdataslab_fromrdataset(rdataset, rbtdb->common.mctx, - ®ion, - sizeof(rdatasetheader_t)); - if (result != ISC_R_SUCCESS) - return (result); - - newheader = (rdatasetheader_t *)region.base; - newheader->ttl = rdataset->ttl + now; - newheader->type = RBTDB_RDATATYPE_VALUE(rdataset->type, - rdataset->covers); - newheader->attributes = 0; - newheader->noqname = NULL; - newheader->count = 0; - newheader->trust = rdataset->trust; - if (rbtversion != NULL) { - newheader->serial = rbtversion->serial; - now = 0; - } else { - newheader->serial = 1; - if ((rdataset->attributes & DNS_RDATASETATTR_NXDOMAIN) != 0) - newheader->attributes |= RDATASET_ATTR_NXDOMAIN; - if ((rdataset->attributes & DNS_RDATASETATTR_NOQNAME) != 0) { - result = addnoqname(rbtdb, newheader, rdataset); - if (result != ISC_R_SUCCESS) { - free_rdataset(rbtdb->common.mctx, newheader); - return (result); - } - } - } - - /* - * If we're adding a delegation type (e.g. NS or DNAME for a zone, - * just DNAME for the cache), then we need to set the callback bit - * on the node, and to do that we must be holding an exclusive lock - * on the tree. - */ - if (delegating_type(rbtdb, rbtnode, rdataset->type)) { - delegating = ISC_TRUE; - RWLOCK(&rbtdb->tree_lock, isc_rwlocktype_write); - } else - delegating = ISC_FALSE; - - LOCK(&rbtdb->node_locks[rbtnode->locknum].lock); - - result = add(rbtdb, rbtnode, rbtversion, newheader, options, ISC_FALSE, - addedrdataset, now); - if (result == ISC_R_SUCCESS && delegating) - rbtnode->find_callback = 1; - - UNLOCK(&rbtdb->node_locks[rbtnode->locknum].lock); - - if (delegating) - RWUNLOCK(&rbtdb->tree_lock, isc_rwlocktype_write); - - return (result); -} - -static 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) -{ - dns_rbtdb_t *rbtdb = (dns_rbtdb_t *)db; - dns_rbtnode_t *rbtnode = (dns_rbtnode_t *)node; - rbtdb_version_t *rbtversion = version; - rdatasetheader_t *topheader, *topheader_prev, *header, *newheader; - unsigned char *subresult; - isc_region_t region; - isc_result_t result; - rbtdb_changed_t *changed; - - REQUIRE(VALID_RBTDB(rbtdb)); - - result = dns_rdataslab_fromrdataset(rdataset, rbtdb->common.mctx, - ®ion, - sizeof(rdatasetheader_t)); - if (result != ISC_R_SUCCESS) - return (result); - newheader = (rdatasetheader_t *)region.base; - newheader->ttl = rdataset->ttl; - newheader->type = RBTDB_RDATATYPE_VALUE(rdataset->type, - rdataset->covers); - newheader->attributes = 0; - newheader->serial = rbtversion->serial; - newheader->trust = 0; - newheader->noqname = NULL; - newheader->count = 0; - - LOCK(&rbtdb->node_locks[rbtnode->locknum].lock); - - changed = add_changed(rbtdb, rbtversion, rbtnode); - if (changed == NULL) { - free_rdataset(rbtdb->common.mctx, newheader); - UNLOCK(&rbtdb->node_locks[rbtnode->locknum].lock); - return (ISC_R_NOMEMORY); - } - - topheader_prev = NULL; - for (topheader = rbtnode->data; - topheader != NULL; - topheader = topheader->next) { - if (topheader->type == newheader->type) - break; - topheader_prev = topheader; - } - /* - * If header isn't NULL, we've found the right type. There may be - * IGNORE rdatasets between the top of the chain and the first real - * data. We skip over them. - */ - header = topheader; - while (header != NULL && IGNORE(header)) - header = header->down; - if (header != NULL && EXISTS(header)) { - unsigned int flags = 0; - subresult = NULL; - result = ISC_R_SUCCESS; - if ((options & DNS_DBSUB_EXACT) != 0) { - flags |= DNS_RDATASLAB_EXACT; - if (newheader->ttl != header->ttl) - result = DNS_R_NOTEXACT; - } - if (result == ISC_R_SUCCESS) - result = dns_rdataslab_subtract( - (unsigned char *)header, - (unsigned char *)newheader, - (unsigned int)(sizeof(*newheader)), - rbtdb->common.mctx, - rbtdb->common.rdclass, - (dns_rdatatype_t)header->type, - flags, &subresult); - if (result == ISC_R_SUCCESS) { - free_rdataset(rbtdb->common.mctx, newheader); - newheader = (rdatasetheader_t *)subresult; - /* - * We have to set the serial since the rdataslab - * subtraction routine copies the reserved portion of - * header, not newheader. - */ - newheader->serial = rbtversion->serial; - } else if (result == DNS_R_NXRRSET) { - /* - * This subtraction would remove all of the rdata; - * add a nonexistent header instead. - */ - free_rdataset(rbtdb->common.mctx, newheader); - newheader = isc_mem_get(rbtdb->common.mctx, - sizeof(*newheader)); - if (newheader == NULL) { - result = ISC_R_NOMEMORY; - goto unlock; - } - newheader->ttl = 0; - newheader->type = topheader->type; - newheader->attributes = RDATASET_ATTR_NONEXISTENT; - newheader->trust = 0; - newheader->serial = rbtversion->serial; - newheader->noqname = NULL; - newheader->count = 0; - } else { - free_rdataset(rbtdb->common.mctx, newheader); - goto unlock; - } - - /* - * If we're here, we want to link newheader in front of - * topheader. - */ - INSIST(rbtversion->serial >= topheader->serial); - if (topheader_prev != NULL) - topheader_prev->next = newheader; - else - rbtnode->data = newheader; - newheader->next = topheader->next; - newheader->down = topheader; - topheader->next = newheader; - rbtnode->dirty = 1; - changed->dirty = ISC_TRUE; - } else { - /* - * The rdataset doesn't exist, so we don't need to do anything - * to satisfy the deletion request. - */ - free_rdataset(rbtdb->common.mctx, newheader); - if ((options & DNS_DBSUB_EXACT) != 0) - result = DNS_R_NOTEXACT; - else - result = DNS_R_UNCHANGED; - } - - if (result == ISC_R_SUCCESS && newrdataset != NULL) - bind_rdataset(rbtdb, rbtnode, newheader, 0, newrdataset); - - unlock: - UNLOCK(&rbtdb->node_locks[rbtnode->locknum].lock); - - return (result); -} - -static isc_result_t -deleterdataset(dns_db_t *db, dns_dbnode_t *node, dns_dbversion_t *version, - dns_rdatatype_t type, dns_rdatatype_t covers) -{ - dns_rbtdb_t *rbtdb = (dns_rbtdb_t *)db; - dns_rbtnode_t *rbtnode = (dns_rbtnode_t *)node; - rbtdb_version_t *rbtversion = version; - isc_result_t result; - rdatasetheader_t *newheader; - - REQUIRE(VALID_RBTDB(rbtdb)); - - if (type == dns_rdatatype_any) - return (ISC_R_NOTIMPLEMENTED); - if (type == dns_rdatatype_rrsig && covers == 0) - return (ISC_R_NOTIMPLEMENTED); - - newheader = isc_mem_get(rbtdb->common.mctx, sizeof(*newheader)); - if (newheader == NULL) - return (ISC_R_NOMEMORY); - newheader->ttl = 0; - newheader->type = RBTDB_RDATATYPE_VALUE(type, covers); - newheader->attributes = RDATASET_ATTR_NONEXISTENT; - newheader->trust = 0; - newheader->noqname = NULL; - if (rbtversion != NULL) - newheader->serial = rbtversion->serial; - else - newheader->serial = 0; - newheader->count = 0; - - LOCK(&rbtdb->node_locks[rbtnode->locknum].lock); - - result = add(rbtdb, rbtnode, rbtversion, newheader, DNS_DBADD_FORCE, - ISC_FALSE, NULL, 0); - - UNLOCK(&rbtdb->node_locks[rbtnode->locknum].lock); - - return (result); -} - -static isc_result_t -loading_addrdataset(void *arg, dns_name_t *name, dns_rdataset_t *rdataset) { - rbtdb_load_t *loadctx = arg; - dns_rbtdb_t *rbtdb = loadctx->rbtdb; - dns_rbtnode_t *node; - isc_result_t result; - isc_region_t region; - rdatasetheader_t *newheader; - - /* - * This routine does no node locking. See comments in - * 'load' below for more information on loading and - * locking. - */ - - - /* - * SOA records are only allowed at top of zone. - */ - if (rdataset->type == dns_rdatatype_soa && - !IS_CACHE(rbtdb) && !dns_name_equal(name, &rbtdb->common.origin)) - return (DNS_R_NOTZONETOP); - - add_empty_wildcards(rbtdb, name); - - if (dns_name_iswildcard(name)) { - /* - * NS record owners cannot legally be wild cards. - */ - if (rdataset->type == dns_rdatatype_ns) - return (DNS_R_INVALIDNS); - result = add_wildcard_magic(rbtdb, name); - if (result != ISC_R_SUCCESS) - return (result); - } - - node = NULL; - result = dns_rbt_addnode(rbtdb->tree, name, &node); - if (result != ISC_R_SUCCESS && result != ISC_R_EXISTS) - return (result); - if (result != ISC_R_EXISTS) { - dns_name_t foundname; - dns_name_init(&foundname, NULL); - dns_rbt_namefromnode(node, &foundname); -#ifdef DNS_RBT_USEHASH - node->locknum = node->hashval % rbtdb->node_lock_count; -#else - node->locknum = dns_name_hash(&foundname, ISC_TRUE) % - rbtdb->node_lock_count; -#endif - } - - result = dns_rdataslab_fromrdataset(rdataset, rbtdb->common.mctx, - ®ion, - sizeof(rdatasetheader_t)); - if (result != ISC_R_SUCCESS) - return (result); - newheader = (rdatasetheader_t *)region.base; - newheader->ttl = rdataset->ttl + loadctx->now; /* XXX overflow check */ - newheader->type = RBTDB_RDATATYPE_VALUE(rdataset->type, - rdataset->covers); - newheader->attributes = 0; - newheader->trust = rdataset->trust; - newheader->serial = 1; - newheader->noqname = NULL; - newheader->count = 0; - - result = add(rbtdb, node, rbtdb->current_version, newheader, - DNS_DBADD_MERGE, ISC_TRUE, NULL, 0); - if (result == ISC_R_SUCCESS && - delegating_type(rbtdb, node, rdataset->type)) - node->find_callback = 1; - else if (result == DNS_R_UNCHANGED) - result = ISC_R_SUCCESS; - - return (result); -} - -static isc_result_t -beginload(dns_db_t *db, dns_addrdatasetfunc_t *addp, dns_dbload_t **dbloadp) { - rbtdb_load_t *loadctx; - dns_rbtdb_t *rbtdb; - - rbtdb = (dns_rbtdb_t *)db; - - REQUIRE(VALID_RBTDB(rbtdb)); - - loadctx = isc_mem_get(rbtdb->common.mctx, sizeof(*loadctx)); - if (loadctx == NULL) - return (ISC_R_NOMEMORY); - - loadctx->rbtdb = rbtdb; - if (IS_CACHE(rbtdb)) - isc_stdtime_get(&loadctx->now); - else - loadctx->now = 0; - - LOCK(&rbtdb->lock); - - REQUIRE((rbtdb->attributes & (RBTDB_ATTR_LOADED|RBTDB_ATTR_LOADING)) - == 0); - rbtdb->attributes |= RBTDB_ATTR_LOADING; - - UNLOCK(&rbtdb->lock); - - *addp = loading_addrdataset; - *dbloadp = loadctx; - - return (ISC_R_SUCCESS); -} - -static isc_boolean_t -iszonesecure(dns_db_t *db, dns_dbnode_t *origin) { - dns_rdataset_t keyset; - dns_rdataset_t nsecset, signsecset; - isc_boolean_t haszonekey = ISC_FALSE; - isc_boolean_t hasnsec = ISC_FALSE; - isc_result_t result; - - dns_rdataset_init(&keyset); - result = dns_db_findrdataset(db, origin, NULL, dns_rdatatype_dnskey, 0, - 0, &keyset, NULL); - if (result == ISC_R_SUCCESS) { - dns_rdata_t keyrdata = DNS_RDATA_INIT; - result = dns_rdataset_first(&keyset); - while (result == ISC_R_SUCCESS) { - dns_rdataset_current(&keyset, &keyrdata); - if (dns_zonekey_iszonekey(&keyrdata)) { - haszonekey = ISC_TRUE; - break; - } - result = dns_rdataset_next(&keyset); - } - dns_rdataset_disassociate(&keyset); - } - if (!haszonekey) - return (ISC_FALSE); - - dns_rdataset_init(&nsecset); - dns_rdataset_init(&signsecset); - result = dns_db_findrdataset(db, origin, NULL, dns_rdatatype_nsec, 0, - 0, &nsecset, &signsecset); - if (result == ISC_R_SUCCESS) { - if (dns_rdataset_isassociated(&signsecset)) { - hasnsec = ISC_TRUE; - dns_rdataset_disassociate(&signsecset); - } - dns_rdataset_disassociate(&nsecset); - } - return (hasnsec); - -} - -static isc_result_t -endload(dns_db_t *db, dns_dbload_t **dbloadp) { - rbtdb_load_t *loadctx; - dns_rbtdb_t *rbtdb = (dns_rbtdb_t *)db; - - REQUIRE(VALID_RBTDB(rbtdb)); - REQUIRE(dbloadp != NULL); - loadctx = *dbloadp; - REQUIRE(loadctx->rbtdb == rbtdb); - - LOCK(&rbtdb->lock); - - REQUIRE((rbtdb->attributes & RBTDB_ATTR_LOADING) != 0); - REQUIRE((rbtdb->attributes & RBTDB_ATTR_LOADED) == 0); - - rbtdb->attributes &= ~RBTDB_ATTR_LOADING; - rbtdb->attributes |= RBTDB_ATTR_LOADED; - - UNLOCK(&rbtdb->lock); - - /* - * If there's a KEY rdataset at the zone origin containing a - * zone key, we consider the zone secure. - */ - if (! IS_CACHE(rbtdb)) - rbtdb->secure = iszonesecure(db, rbtdb->origin_node); - - *dbloadp = NULL; - - isc_mem_put(rbtdb->common.mctx, loadctx, sizeof(*loadctx)); - - return (ISC_R_SUCCESS); -} - -static isc_result_t -dump(dns_db_t *db, dns_dbversion_t *version, const char *filename) { - dns_rbtdb_t *rbtdb; - - rbtdb = (dns_rbtdb_t *)db; - - REQUIRE(VALID_RBTDB(rbtdb)); - - return (dns_master_dump(rbtdb->common.mctx, db, version, - &dns_master_style_default, - filename)); -} - -static void -delete_callback(void *data, void *arg) { - dns_rbtdb_t *rbtdb = arg; - rdatasetheader_t *current, *next; - - for (current = data; current != NULL; current = next) { - next = current->next; - free_rdataset(rbtdb->common.mctx, current); - } -} - -static isc_boolean_t -issecure(dns_db_t *db) { - dns_rbtdb_t *rbtdb; - isc_boolean_t secure; - - rbtdb = (dns_rbtdb_t *)db; - - REQUIRE(VALID_RBTDB(rbtdb)); - - RWLOCK(&rbtdb->tree_lock, isc_rwlocktype_read); - secure = rbtdb->secure; - RWUNLOCK(&rbtdb->tree_lock, isc_rwlocktype_read); - - return (secure); -} - -static unsigned int -nodecount(dns_db_t *db) { - dns_rbtdb_t *rbtdb; - unsigned int count; - - rbtdb = (dns_rbtdb_t *)db; - - REQUIRE(VALID_RBTDB(rbtdb)); - - RWLOCK(&rbtdb->tree_lock, isc_rwlocktype_read); - count = dns_rbt_nodecount(rbtdb->tree); - RWUNLOCK(&rbtdb->tree_lock, isc_rwlocktype_read); - - return (count); -} - -static void -settask(dns_db_t *db, isc_task_t *task) { - dns_rbtdb_t *rbtdb; - - rbtdb = (dns_rbtdb_t *)db; - - REQUIRE(VALID_RBTDB(rbtdb)); - - LOCK(&rbtdb->lock); - if (rbtdb->task != NULL) - isc_task_detach(&rbtdb->task); - if (task != NULL) - isc_task_attach(task, &rbtdb->task); - UNLOCK(&rbtdb->lock); -} - -static isc_boolean_t -ispersistent(dns_db_t *db) { - UNUSED(db); - return (ISC_FALSE); -} - -static dns_dbmethods_t zone_methods = { - attach, - detach, - beginload, - endload, - dump, - currentversion, - newversion, - attachversion, - closeversion, - findnode, - zone_find, - zone_findzonecut, - attachnode, - detachnode, - expirenode, - printnode, - createiterator, - zone_findrdataset, - allrdatasets, - addrdataset, - subtractrdataset, - deleterdataset, - issecure, - nodecount, - ispersistent, - overmem, - settask -}; - -static dns_dbmethods_t cache_methods = { - attach, - detach, - beginload, - endload, - dump, - currentversion, - newversion, - attachversion, - closeversion, - findnode, - cache_find, - cache_findzonecut, - attachnode, - detachnode, - expirenode, - printnode, - createiterator, - cache_findrdataset, - allrdatasets, - addrdataset, - subtractrdataset, - deleterdataset, - issecure, - nodecount, - ispersistent, - overmem, - settask -}; - -isc_result_t -#ifdef DNS_RBTDB_VERSION64 -dns_rbtdb64_create -#else -dns_rbtdb_create -#endif - (isc_mem_t *mctx, dns_name_t *origin, dns_dbtype_t type, - dns_rdataclass_t rdclass, unsigned int argc, char *argv[], - void *driverarg, dns_db_t **dbp) -{ - dns_rbtdb_t *rbtdb; - isc_result_t result; - int i; - dns_name_t name; - - /* Keep the compiler happy. */ - UNUSED(argc); - UNUSED(argv); - UNUSED(driverarg); - - rbtdb = isc_mem_get(mctx, sizeof(*rbtdb)); - if (rbtdb == NULL) - return (ISC_R_NOMEMORY); - memset(rbtdb, '\0', sizeof(*rbtdb)); - dns_name_init(&rbtdb->common.origin, NULL); - rbtdb->common.attributes = 0; - if (type == dns_dbtype_cache) { - rbtdb->common.methods = &cache_methods; - rbtdb->common.attributes |= DNS_DBATTR_CACHE; - } else if (type == dns_dbtype_stub) { - rbtdb->common.methods = &zone_methods; - rbtdb->common.attributes |= DNS_DBATTR_STUB; - } else - rbtdb->common.methods = &zone_methods; - rbtdb->common.rdclass = rdclass; - rbtdb->common.mctx = NULL; - - result = isc_mutex_init(&rbtdb->lock); - if (result != ISC_R_SUCCESS) { - isc_mem_put(mctx, rbtdb, sizeof(*rbtdb)); - UNEXPECTED_ERROR(__FILE__, __LINE__, - "isc_mutex_init() failed: %s", - isc_result_totext(result)); - return (ISC_R_UNEXPECTED); - } - - result = isc_rwlock_init(&rbtdb->tree_lock, 0, 0); - if (result != ISC_R_SUCCESS) { - DESTROYLOCK(&rbtdb->lock); - isc_mem_put(mctx, rbtdb, sizeof(*rbtdb)); - UNEXPECTED_ERROR(__FILE__, __LINE__, - "isc_rwlock_init() failed: %s", - isc_result_totext(result)); - return (ISC_R_UNEXPECTED); - } - - INSIST(rbtdb->node_lock_count < (1 << DNS_RBT_LOCKLENGTH)); - - if (rbtdb->node_lock_count == 0) - rbtdb->node_lock_count = DEFAULT_NODE_LOCK_COUNT; - rbtdb->node_locks = isc_mem_get(mctx, rbtdb->node_lock_count * - sizeof(rbtdb_nodelock_t)); - rbtdb->active = rbtdb->node_lock_count; - for (i = 0; i < (int)(rbtdb->node_lock_count); i++) { - result = isc_mutex_init(&rbtdb->node_locks[i].lock); - if (result != ISC_R_SUCCESS) { - i--; - while (i >= 0) { - DESTROYLOCK(&rbtdb->node_locks[i].lock); - i--; - } - isc_mem_put(mctx, rbtdb->node_locks, - rbtdb->node_lock_count * - sizeof(rbtdb_nodelock_t)); - isc_rwlock_destroy(&rbtdb->tree_lock); - DESTROYLOCK(&rbtdb->lock); - isc_mem_put(mctx, rbtdb, sizeof(*rbtdb)); - UNEXPECTED_ERROR(__FILE__, __LINE__, - "isc_mutex_init() failed: %s", - isc_result_totext(result)); - return (ISC_R_UNEXPECTED); - } - rbtdb->node_locks[i].references = 0; - rbtdb->node_locks[i].exiting = ISC_FALSE; - } - - /* - * Attach to the mctx. The database will persist so long as there - * are references to it, and attaching to the mctx ensures that our - * mctx won't disappear out from under us. - */ - isc_mem_attach(mctx, &rbtdb->common.mctx); - - /* - * Must be initalized before free_rbtdb() is called. - */ - isc_ondestroy_init(&rbtdb->common.ondest); - - /* - * Make a copy of the origin name. - */ - result = dns_name_dupwithoffsets(origin, mctx, &rbtdb->common.origin); - if (result != ISC_R_SUCCESS) { - free_rbtdb(rbtdb, ISC_FALSE, NULL); - return (result); - } - - /* - * Make the Red-Black Tree. - */ - result = dns_rbt_create(mctx, delete_callback, rbtdb, &rbtdb->tree); - if (result != ISC_R_SUCCESS) { - free_rbtdb(rbtdb, ISC_FALSE, NULL); - return (result); - } - /* - * In order to set the node callback bit correctly in zone databases, - * we need to know if the node has the origin name of the zone. - * In loading_addrdataset() we could simply compare the new name - * to the origin name, but this is expensive. Also, we don't know the - * node name in addrdataset(), so we need another way of knowing the - * zone's top. - * - * We now explicitly create a node for the zone's origin, and then - * we simply remember the node's address. This is safe, because - * the top-of-zone node can never be deleted, nor can its address - * change. - */ - if (! IS_CACHE(rbtdb)) { - rbtdb->origin_node = NULL; - result = dns_rbt_addnode(rbtdb->tree, &rbtdb->common.origin, - &rbtdb->origin_node); - if (result != ISC_R_SUCCESS) { - INSIST(result != ISC_R_EXISTS); - free_rbtdb(rbtdb, ISC_FALSE, NULL); - return (result); - } - /* - * We need to give the origin node the right locknum. - */ - dns_name_init(&name, NULL); - dns_rbt_namefromnode(rbtdb->origin_node, &name); -#ifdef DNS_RBT_USEHASH - rbtdb->origin_node->locknum = - rbtdb->origin_node->hashval % - rbtdb->node_lock_count; -#else - rbtdb->origin_node->locknum = - dns_name_hash(&name, ISC_TRUE) % - rbtdb->node_lock_count; -#endif - } - - /* - * Misc. Initialization. - */ - isc_refcount_init(&rbtdb->references, 1); - rbtdb->attributes = 0; - rbtdb->secure = ISC_FALSE; - rbtdb->overmem = ISC_FALSE; - rbtdb->task = NULL; - - /* - * Version Initialization. - */ - rbtdb->current_serial = 1; - rbtdb->least_serial = 1; - rbtdb->next_serial = 2; - rbtdb->current_version = allocate_version(mctx, 1, 0, ISC_FALSE); - if (rbtdb->current_version == NULL) { - free_rbtdb(rbtdb, ISC_FALSE, NULL); - return (ISC_R_NOMEMORY); - } - rbtdb->future_version = NULL; - ISC_LIST_INIT(rbtdb->open_versions); - - rbtdb->common.magic = DNS_DB_MAGIC; - rbtdb->common.impmagic = RBTDB_MAGIC; - - *dbp = (dns_db_t *)rbtdb; - - return (ISC_R_SUCCESS); -} - - -/* - * Slabbed Rdataset Methods - */ - -static void -rdataset_disassociate(dns_rdataset_t *rdataset) { - dns_db_t *db = rdataset->private1; - dns_dbnode_t *node = rdataset->private2; - - detachnode(db, &node); -} - -static isc_result_t -rdataset_first(dns_rdataset_t *rdataset) { - unsigned char *raw = rdataset->private3; - unsigned int count; - - count = raw[0] * 256 + raw[1]; - if (count == 0) { - rdataset->private5 = NULL; - return (ISC_R_NOMORE); - } - raw += 2; - /* - * The privateuint4 field is the number of rdata beyond the cursor - * position, so we decrement the total count by one before storing - * it. - */ - count--; - rdataset->privateuint4 = count; - rdataset->private5 = raw; - - return (ISC_R_SUCCESS); -} - -static isc_result_t -rdataset_next(dns_rdataset_t *rdataset) { - unsigned int count; - unsigned int length; - unsigned char *raw; - - count = rdataset->privateuint4; - if (count == 0) - return (ISC_R_NOMORE); - count--; - rdataset->privateuint4 = count; - raw = rdataset->private5; - length = raw[0] * 256 + raw[1]; - raw += length + 2; - rdataset->private5 = raw; - - return (ISC_R_SUCCESS); -} - -static void -rdataset_current(dns_rdataset_t *rdataset, dns_rdata_t *rdata) { - unsigned char *raw = rdataset->private5; - isc_region_t r; - - REQUIRE(raw != NULL); - - r.length = raw[0] * 256 + raw[1]; - raw += 2; - r.base = raw; - dns_rdata_fromregion(rdata, rdataset->rdclass, rdataset->type, &r); -} - -static void -rdataset_clone(dns_rdataset_t *source, dns_rdataset_t *target) { - dns_db_t *db = source->private1; - dns_dbnode_t *node = source->private2; - dns_dbnode_t *cloned_node = NULL; - - attachnode(db, node, &cloned_node); - *target = *source; - - /* - * Reset iterator state. - */ - target->privateuint4 = 0; - target->private5 = NULL; -} - -static unsigned int -rdataset_count(dns_rdataset_t *rdataset) { - unsigned char *raw = rdataset->private3; - unsigned int count; - - count = raw[0] * 256 + raw[1]; - - return (count); -} - -static isc_result_t -rdataset_getnoqname(dns_rdataset_t *rdataset, dns_name_t *name, - dns_rdataset_t *nsec, dns_rdataset_t *nsecsig) -{ - dns_db_t *db = rdataset->private1; - dns_dbnode_t *node = rdataset->private2; - dns_dbnode_t *cloned_node; - struct noqname *noqname = rdataset->private6; - - cloned_node = NULL; - attachnode(db, node, &cloned_node); - nsec->methods = &rdataset_methods; - nsec->rdclass = db->rdclass; - nsec->type = dns_rdatatype_nsec; - nsec->covers = 0; - nsec->ttl = rdataset->ttl; - nsec->trust = rdataset->trust; - nsec->private1 = rdataset->private1; - nsec->private2 = rdataset->private2; - nsec->private3 = noqname->nsec; - nsec->privateuint4 = 0; - nsec->private5 = NULL; - nsec->private6 = NULL; - - cloned_node = NULL; - attachnode(db, node, &cloned_node); - nsecsig->methods = &rdataset_methods; - nsecsig->rdclass = db->rdclass; - nsecsig->type = dns_rdatatype_rrsig; - nsecsig->covers = dns_rdatatype_nsec; - nsecsig->ttl = rdataset->ttl; - nsecsig->trust = rdataset->trust; - nsecsig->private1 = rdataset->private1; - nsecsig->private2 = rdataset->private2; - nsecsig->private3 = noqname->nsecsig; - nsecsig->privateuint4 = 0; - nsecsig->private5 = NULL; - nsec->private6 = NULL; - - dns_name_clone(&noqname->name, name); - - return (ISC_R_SUCCESS); -} - -/* - * Rdataset Iterator Methods - */ - -static void -rdatasetiter_destroy(dns_rdatasetiter_t **iteratorp) { - rbtdb_rdatasetiter_t *rbtiterator; - - rbtiterator = (rbtdb_rdatasetiter_t *)(*iteratorp); - - if (rbtiterator->common.version != NULL) - closeversion(rbtiterator->common.db, - &rbtiterator->common.version, ISC_FALSE); - detachnode(rbtiterator->common.db, &rbtiterator->common.node); - isc_mem_put(rbtiterator->common.db->mctx, rbtiterator, - sizeof(*rbtiterator)); - - *iteratorp = NULL; -} - -static isc_result_t -rdatasetiter_first(dns_rdatasetiter_t *iterator) { - rbtdb_rdatasetiter_t *rbtiterator = (rbtdb_rdatasetiter_t *)iterator; - dns_rbtdb_t *rbtdb = (dns_rbtdb_t *)(rbtiterator->common.db); - dns_rbtnode_t *rbtnode = rbtiterator->common.node; - rbtdb_version_t *rbtversion = rbtiterator->common.version; - rdatasetheader_t *header, *top_next; - rbtdb_serial_t serial; - isc_stdtime_t now; - - if (IS_CACHE(rbtdb)) { - serial = 1; - now = rbtiterator->common.now; - } else { - serial = rbtversion->serial; - now = 0; - } - - LOCK(&rbtdb->node_locks[rbtnode->locknum].lock); - - for (header = rbtnode->data; header != NULL; header = top_next) { - top_next = header->next; - do { - if (header->serial <= serial && !IGNORE(header)) { - /* - * Is this a "this rdataset doesn't exist" - * record? Or is it too old in the cache? - * - * Note: unlike everywhere else, we - * check for now > header->ttl instead - * of now >= header->ttl. This allows - * ANY and RRSIG queries for 0 TTL - * rdatasets to work. - */ - if (NONEXISTENT(header) || - (now != 0 && now > header->ttl)) - header = NULL; - break; - } else - header = header->down; - } while (header != NULL); - if (header != NULL) - break; - } - - UNLOCK(&rbtdb->node_locks[rbtnode->locknum].lock); - - rbtiterator->current = header; - - if (header == NULL) - return (ISC_R_NOMORE); - - return (ISC_R_SUCCESS); -} - -static isc_result_t -rdatasetiter_next(dns_rdatasetiter_t *iterator) { - rbtdb_rdatasetiter_t *rbtiterator = (rbtdb_rdatasetiter_t *)iterator; - dns_rbtdb_t *rbtdb = (dns_rbtdb_t *)(rbtiterator->common.db); - dns_rbtnode_t *rbtnode = rbtiterator->common.node; - rbtdb_version_t *rbtversion = rbtiterator->common.version; - rdatasetheader_t *header, *top_next; - rbtdb_serial_t serial; - isc_stdtime_t now; - rbtdb_rdatatype_t type; - - header = rbtiterator->current; - if (header == NULL) - return (ISC_R_NOMORE); - - if (IS_CACHE(rbtdb)) { - serial = 1; - now = rbtiterator->common.now; - } else { - serial = rbtversion->serial; - now = 0; - } - - LOCK(&rbtdb->node_locks[rbtnode->locknum].lock); - - type = header->type; - for (header = header->next; header != NULL; header = top_next) { - top_next = header->next; - if (header->type != type) { - do { - if (header->serial <= serial && - !IGNORE(header)) { - /* - * Is this a "this rdataset doesn't - * exist" record? - * - * Note: unlike everywhere else, we - * check for now > header->ttl instead - * of now >= header->ttl. This allows - * ANY and RRSIG queries for 0 TTL - * rdatasets to work. - */ - if ((header->attributes & - RDATASET_ATTR_NONEXISTENT) != 0 || - (now != 0 && now > header->ttl)) - header = NULL; - break; - } else - header = header->down; - } while (header != NULL); - if (header != NULL) - break; - } - } - - UNLOCK(&rbtdb->node_locks[rbtnode->locknum].lock); - - rbtiterator->current = header; - - if (header == NULL) - return (ISC_R_NOMORE); - - return (ISC_R_SUCCESS); -} - -static void -rdatasetiter_current(dns_rdatasetiter_t *iterator, dns_rdataset_t *rdataset) { - rbtdb_rdatasetiter_t *rbtiterator = (rbtdb_rdatasetiter_t *)iterator; - dns_rbtdb_t *rbtdb = (dns_rbtdb_t *)(rbtiterator->common.db); - dns_rbtnode_t *rbtnode = rbtiterator->common.node; - rdatasetheader_t *header; - - header = rbtiterator->current; - REQUIRE(header != NULL); - - LOCK(&rbtdb->node_locks[rbtnode->locknum].lock); - - bind_rdataset(rbtdb, rbtnode, header, rbtiterator->common.now, - rdataset); - - UNLOCK(&rbtdb->node_locks[rbtnode->locknum].lock); -} - - -/* - * Database Iterator Methods - */ - -static inline void -reference_iter_node(rbtdb_dbiterator_t *rbtdbiter) { - dns_rbtdb_t *rbtdb = (dns_rbtdb_t *)rbtdbiter->common.db; - dns_rbtnode_t *node = rbtdbiter->node; - - if (node == NULL) - return; - - INSIST(rbtdbiter->tree_locked != isc_rwlocktype_none); - LOCK(&rbtdb->node_locks[node->locknum].lock); - new_reference(rbtdb, node); - UNLOCK(&rbtdb->node_locks[node->locknum].lock); -} - -static inline void -dereference_iter_node(rbtdb_dbiterator_t *rbtdbiter) { - dns_rbtdb_t *rbtdb = (dns_rbtdb_t *)rbtdbiter->common.db; - dns_rbtnode_t *node = rbtdbiter->node; - isc_mutex_t *lock; - - if (node == NULL) - return; - - lock = &rbtdb->node_locks[node->locknum].lock; - LOCK(lock); - INSIST(rbtdbiter->node->references > 0); - if (--node->references == 0) - no_references(rbtdb, node, 0, rbtdbiter->tree_locked); - UNLOCK(lock); - - rbtdbiter->node = NULL; -} - -static void -flush_deletions(rbtdb_dbiterator_t *rbtdbiter) { - dns_rbtnode_t *node; - dns_rbtdb_t *rbtdb = (dns_rbtdb_t *)rbtdbiter->common.db; - isc_boolean_t was_read_locked = ISC_FALSE; - isc_mutex_t *lock; - int i; - - if (rbtdbiter->delete != 0) { - /* - * Note that "%d node of %d in tree" can report things like - * "flush_deletions: 59 nodes of 41 in tree". This means - * That some nodes appear on the deletions list more than - * once. Only the last occurence will actually be deleted. - */ - isc_log_write(dns_lctx, DNS_LOGCATEGORY_DATABASE, - DNS_LOGMODULE_CACHE, ISC_LOG_DEBUG(1), - "flush_deletions: %d nodes of %d in tree", - rbtdbiter->delete, - dns_rbt_nodecount(rbtdb->tree)); - - if (rbtdbiter->tree_locked == isc_rwlocktype_read) { - RWUNLOCK(&rbtdb->tree_lock, isc_rwlocktype_read); - was_read_locked = ISC_TRUE; - } - RWLOCK(&rbtdb->tree_lock, isc_rwlocktype_write); - rbtdbiter->tree_locked = isc_rwlocktype_write; - - for (i = 0; i < rbtdbiter->delete; i++) { - node = rbtdbiter->deletions[i]; - lock = &rbtdb->node_locks[node->locknum].lock; - - LOCK(lock); - INSIST(node->references > 0); - node->references--; - if (node->references == 0) - no_references(rbtdb, node, 0, - rbtdbiter->tree_locked); - UNLOCK(lock); - } - - rbtdbiter->delete = 0; - - RWUNLOCK(&rbtdb->tree_lock, isc_rwlocktype_write); - if (was_read_locked) { - RWLOCK(&rbtdb->tree_lock, isc_rwlocktype_read); - rbtdbiter->tree_locked = isc_rwlocktype_read; - - } else { - rbtdbiter->tree_locked = isc_rwlocktype_none; - } - } -} - -static inline void -resume_iteration(rbtdb_dbiterator_t *rbtdbiter) { - dns_rbtdb_t *rbtdb = (dns_rbtdb_t *)rbtdbiter->common.db; - - REQUIRE(rbtdbiter->paused); - REQUIRE(rbtdbiter->tree_locked == isc_rwlocktype_none); - - RWLOCK(&rbtdb->tree_lock, isc_rwlocktype_read); - rbtdbiter->tree_locked = isc_rwlocktype_read; - - rbtdbiter->paused = ISC_FALSE; -} - -static void -dbiterator_destroy(dns_dbiterator_t **iteratorp) { - rbtdb_dbiterator_t *rbtdbiter = (rbtdb_dbiterator_t *)(*iteratorp); - dns_rbtdb_t *rbtdb = (dns_rbtdb_t *)rbtdbiter->common.db; - dns_db_t *db = NULL; - - if (rbtdbiter->tree_locked == isc_rwlocktype_read) { - RWUNLOCK(&rbtdb->tree_lock, isc_rwlocktype_read); - rbtdbiter->tree_locked = isc_rwlocktype_none; - } else - INSIST(rbtdbiter->tree_locked == isc_rwlocktype_none); - - dereference_iter_node(rbtdbiter); - - flush_deletions(rbtdbiter); - - dns_db_attach(rbtdbiter->common.db, &db); - dns_db_detach(&rbtdbiter->common.db); - - dns_rbtnodechain_reset(&rbtdbiter->chain); - isc_mem_put(db->mctx, rbtdbiter, sizeof(*rbtdbiter)); - dns_db_detach(&db); - - *iteratorp = NULL; -} - -static isc_result_t -dbiterator_first(dns_dbiterator_t *iterator) { - isc_result_t result; - rbtdb_dbiterator_t *rbtdbiter = (rbtdb_dbiterator_t *)iterator; - dns_rbtdb_t *rbtdb = (dns_rbtdb_t *)iterator->db; - dns_name_t *name, *origin; - - if (rbtdbiter->result != ISC_R_SUCCESS && - rbtdbiter->result != ISC_R_NOMORE) - return (rbtdbiter->result); - - if (rbtdbiter->paused) - resume_iteration(rbtdbiter); - - dereference_iter_node(rbtdbiter); - - name = dns_fixedname_name(&rbtdbiter->name); - origin = dns_fixedname_name(&rbtdbiter->origin); - dns_rbtnodechain_reset(&rbtdbiter->chain); - - result = dns_rbtnodechain_first(&rbtdbiter->chain, rbtdb->tree, name, - origin); - - if (result == ISC_R_SUCCESS || result == DNS_R_NEWORIGIN) { - result = dns_rbtnodechain_current(&rbtdbiter->chain, NULL, - NULL, &rbtdbiter->node); - if (result == ISC_R_SUCCESS) { - rbtdbiter->new_origin = ISC_TRUE; - reference_iter_node(rbtdbiter); - } - } else { - INSIST(result == ISC_R_NOTFOUND); - result = ISC_R_NOMORE; /* The tree is empty. */ - } - - rbtdbiter->result = result; - - return (result); -} - -static isc_result_t -dbiterator_last(dns_dbiterator_t *iterator) { - isc_result_t result; - rbtdb_dbiterator_t *rbtdbiter = (rbtdb_dbiterator_t *)iterator; - dns_rbtdb_t *rbtdb = (dns_rbtdb_t *)iterator->db; - dns_name_t *name, *origin; - - if (rbtdbiter->result != ISC_R_SUCCESS && - rbtdbiter->result != ISC_R_NOMORE) - return (rbtdbiter->result); - - if (rbtdbiter->paused) - resume_iteration(rbtdbiter); - - dereference_iter_node(rbtdbiter); - - name = dns_fixedname_name(&rbtdbiter->name); - origin = dns_fixedname_name(&rbtdbiter->origin); - dns_rbtnodechain_reset(&rbtdbiter->chain); - - result = dns_rbtnodechain_last(&rbtdbiter->chain, rbtdb->tree, name, - origin); - if (result == ISC_R_SUCCESS || result == DNS_R_NEWORIGIN) { - result = dns_rbtnodechain_current(&rbtdbiter->chain, NULL, - NULL, &rbtdbiter->node); - if (result == ISC_R_SUCCESS) { - rbtdbiter->new_origin = ISC_TRUE; - reference_iter_node(rbtdbiter); - } - } else { - INSIST(result == ISC_R_NOTFOUND); - result = ISC_R_NOMORE; /* The tree is empty. */ - } - - rbtdbiter->result = result; - - return (result); -} - -static isc_result_t -dbiterator_seek(dns_dbiterator_t *iterator, dns_name_t *name) { - isc_result_t result; - rbtdb_dbiterator_t *rbtdbiter = (rbtdb_dbiterator_t *)iterator; - dns_rbtdb_t *rbtdb = (dns_rbtdb_t *)iterator->db; - dns_name_t *iname, *origin; - - if (rbtdbiter->result != ISC_R_SUCCESS && - rbtdbiter->result != ISC_R_NOMORE) - return (rbtdbiter->result); - - if (rbtdbiter->paused) - resume_iteration(rbtdbiter); - - dereference_iter_node(rbtdbiter); - - iname = dns_fixedname_name(&rbtdbiter->name); - origin = dns_fixedname_name(&rbtdbiter->origin); - dns_rbtnodechain_reset(&rbtdbiter->chain); - - result = dns_rbt_findnode(rbtdb->tree, name, NULL, &rbtdbiter->node, - &rbtdbiter->chain, DNS_RBTFIND_EMPTYDATA, - NULL, NULL); - if (result == ISC_R_SUCCESS) { - result = dns_rbtnodechain_current(&rbtdbiter->chain, iname, - origin, NULL); - if (result == ISC_R_SUCCESS) { - rbtdbiter->new_origin = ISC_TRUE; - reference_iter_node(rbtdbiter); - } - - } else if (result == DNS_R_PARTIALMATCH) - result = ISC_R_NOTFOUND; - - rbtdbiter->result = result; - - return (result); -} - -static isc_result_t -dbiterator_prev(dns_dbiterator_t *iterator) { - isc_result_t result; - rbtdb_dbiterator_t *rbtdbiter = (rbtdb_dbiterator_t *)iterator; - dns_name_t *name, *origin; - - REQUIRE(rbtdbiter->node != NULL); - - if (rbtdbiter->result != ISC_R_SUCCESS) - return (rbtdbiter->result); - - if (rbtdbiter->paused) - resume_iteration(rbtdbiter); - - name = dns_fixedname_name(&rbtdbiter->name); - origin = dns_fixedname_name(&rbtdbiter->origin); - result = dns_rbtnodechain_prev(&rbtdbiter->chain, name, origin); - - dereference_iter_node(rbtdbiter); - - if (result == DNS_R_NEWORIGIN || result == ISC_R_SUCCESS) { - rbtdbiter->new_origin = ISC_TF(result == DNS_R_NEWORIGIN); - result = dns_rbtnodechain_current(&rbtdbiter->chain, NULL, - NULL, &rbtdbiter->node); - } - - if (result == ISC_R_SUCCESS) - reference_iter_node(rbtdbiter); - - rbtdbiter->result = result; - - return (result); -} - -static isc_result_t -dbiterator_next(dns_dbiterator_t *iterator) { - isc_result_t result; - rbtdb_dbiterator_t *rbtdbiter = (rbtdb_dbiterator_t *)iterator; - dns_name_t *name, *origin; - - REQUIRE(rbtdbiter->node != NULL); - - if (rbtdbiter->result != ISC_R_SUCCESS) - return (rbtdbiter->result); - - if (rbtdbiter->paused) - resume_iteration(rbtdbiter); - - name = dns_fixedname_name(&rbtdbiter->name); - origin = dns_fixedname_name(&rbtdbiter->origin); - result = dns_rbtnodechain_next(&rbtdbiter->chain, name, origin); - - dereference_iter_node(rbtdbiter); - - if (result == DNS_R_NEWORIGIN || result == ISC_R_SUCCESS) { - rbtdbiter->new_origin = ISC_TF(result == DNS_R_NEWORIGIN); - result = dns_rbtnodechain_current(&rbtdbiter->chain, NULL, - NULL, &rbtdbiter->node); - } - if (result == ISC_R_SUCCESS) - reference_iter_node(rbtdbiter); - - rbtdbiter->result = result; - - return (result); -} - -static isc_result_t -dbiterator_current(dns_dbiterator_t *iterator, dns_dbnode_t **nodep, - dns_name_t *name) -{ - dns_rbtdb_t *rbtdb = (dns_rbtdb_t *)iterator->db; - rbtdb_dbiterator_t *rbtdbiter = (rbtdb_dbiterator_t *)iterator; - dns_rbtnode_t *node = rbtdbiter->node; - isc_result_t result; - dns_name_t *nodename = dns_fixedname_name(&rbtdbiter->name); - dns_name_t *origin = dns_fixedname_name(&rbtdbiter->origin); - - REQUIRE(rbtdbiter->result == ISC_R_SUCCESS); - REQUIRE(rbtdbiter->node != NULL); - - if (rbtdbiter->paused) - resume_iteration(rbtdbiter); - - if (name != NULL) { - if (rbtdbiter->common.relative_names) - origin = NULL; - result = dns_name_concatenate(nodename, origin, name, NULL); - if (result != ISC_R_SUCCESS) - return (result); - if (rbtdbiter->common.relative_names && rbtdbiter->new_origin) - result = DNS_R_NEWORIGIN; - } else - result = ISC_R_SUCCESS; - - LOCK(&rbtdb->node_locks[node->locknum].lock); - new_reference(rbtdb, node); - UNLOCK(&rbtdb->node_locks[node->locknum].lock); - - *nodep = rbtdbiter->node; - - if (iterator->cleaning && result == ISC_R_SUCCESS) { - isc_result_t expire_result; - - /* - * If the deletion array is full, flush it before trying - * to expire the current node. The current node can't - * fully deleted while the iteration cursor is still on it. - */ - if (rbtdbiter->delete == DELETION_BATCH_MAX) - flush_deletions(rbtdbiter); - - expire_result = expirenode(iterator->db, *nodep, 0); - - /* - * expirenode() currently always returns success. - */ - if (expire_result == ISC_R_SUCCESS && node->down == NULL) { - rbtdbiter->deletions[rbtdbiter->delete++] = node; - LOCK(&rbtdb->node_locks[node->locknum].lock); - node->references++; - UNLOCK(&rbtdb->node_locks[node->locknum].lock); - } - } - - return (result); -} - -static isc_result_t -dbiterator_pause(dns_dbiterator_t *iterator) { - dns_rbtdb_t *rbtdb = (dns_rbtdb_t *)iterator->db; - rbtdb_dbiterator_t *rbtdbiter = (rbtdb_dbiterator_t *)iterator; - - if (rbtdbiter->result != ISC_R_SUCCESS && - rbtdbiter->result != ISC_R_NOMORE) - return (rbtdbiter->result); - - if (rbtdbiter->paused) - return (ISC_R_SUCCESS); - - rbtdbiter->paused = ISC_TRUE; - - if (rbtdbiter->tree_locked != isc_rwlocktype_none) { - INSIST(rbtdbiter->tree_locked == isc_rwlocktype_read); - RWUNLOCK(&rbtdb->tree_lock, isc_rwlocktype_read); - rbtdbiter->tree_locked = isc_rwlocktype_none; - } - - flush_deletions(rbtdbiter); - - return (ISC_R_SUCCESS); -} - -static isc_result_t -dbiterator_origin(dns_dbiterator_t *iterator, dns_name_t *name) { - rbtdb_dbiterator_t *rbtdbiter = (rbtdb_dbiterator_t *)iterator; - dns_name_t *origin = dns_fixedname_name(&rbtdbiter->origin); - - if (rbtdbiter->result != ISC_R_SUCCESS) - return (rbtdbiter->result); - - return (dns_name_copy(origin, name, NULL)); -} |