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-rw-r--r--lib/dns/rbtdb.c10667
1 files changed, 10667 insertions, 0 deletions
diff --git a/lib/dns/rbtdb.c b/lib/dns/rbtdb.c
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@@ -0,0 +1,10667 @@
+/*
+ * Copyright (C) Internet Systems Consortium, Inc. ("ISC")
+ *
+ * SPDX-License-Identifier: MPL-2.0
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, you can obtain one at https://mozilla.org/MPL/2.0/.
+ *
+ * See the COPYRIGHT file distributed with this work for additional
+ * information regarding copyright ownership.
+ */
+
+/*! \file */
+
+#include <ctype.h>
+#include <inttypes.h>
+#include <stdbool.h>
+
+#include <isc/atomic.h>
+#include <isc/crc64.h>
+#include <isc/event.h>
+#include <isc/file.h>
+#include <isc/hash.h>
+#include <isc/heap.h>
+#include <isc/hex.h>
+#include <isc/mem.h>
+#include <isc/mutex.h>
+#include <isc/once.h>
+#include <isc/platform.h>
+#include <isc/print.h>
+#include <isc/random.h>
+#include <isc/refcount.h>
+#include <isc/rwlock.h>
+#include <isc/serial.h>
+#include <isc/socket.h>
+#include <isc/stdio.h>
+#include <isc/string.h>
+#include <isc/task.h>
+#include <isc/time.h>
+#include <isc/util.h>
+
+#include <dns/callbacks.h>
+#include <dns/db.h>
+#include <dns/dbiterator.h>
+#include <dns/events.h>
+#include <dns/fixedname.h>
+#include <dns/lib.h>
+#include <dns/log.h>
+#include <dns/masterdump.h>
+#include <dns/nsec.h>
+#include <dns/nsec3.h>
+#include <dns/rbt.h>
+#include <dns/rdata.h>
+#include <dns/rdataset.h>
+#include <dns/rdatasetiter.h>
+#include <dns/rdataslab.h>
+#include <dns/rdatastruct.h>
+#include <dns/result.h>
+#include <dns/stats.h>
+#include <dns/time.h>
+#include <dns/version.h>
+#include <dns/view.h>
+#include <dns/zone.h>
+#include <dns/zonekey.h>
+
+#ifndef WIN32
+#include <sys/mman.h>
+#else /* ifndef WIN32 */
+#define PROT_READ 0x01
+#define PROT_WRITE 0x02
+#define MAP_PRIVATE 0x0002
+#define MAP_FAILED ((void *)-1)
+#endif /* ifndef WIN32 */
+
+#include "rbtdb.h"
+
+#define RBTDB_MAGIC ISC_MAGIC('R', 'B', 'D', '4')
+
+#define CHECK(op) \
+ do { \
+ result = (op); \
+ if (result != ISC_R_SUCCESS) \
+ goto failure; \
+ } while (0)
+
+/*
+ * This is the map file header for RBTDB images. It is populated, and then
+ * written, as the LAST thing done to the file. Writing this last (with
+ * zeros in the header area initially) will ensure that the header is only
+ * valid when the RBTDB image is also valid.
+ */
+typedef struct rbtdb_file_header rbtdb_file_header_t;
+
+/* Header length, always the same size regardless of structure size */
+#define RBTDB_HEADER_LENGTH 1024
+
+struct rbtdb_file_header {
+ char version1[32];
+ uint32_t ptrsize;
+ unsigned int bigendian : 1;
+ uint64_t tree;
+ uint64_t nsec;
+ uint64_t nsec3;
+
+ char version2[32]; /* repeated; must match version1 */
+};
+
+/*%
+ * 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)
+
+typedef uint32_t rbtdb_serial_t;
+typedef 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(base, ext) \
+ ((rbtdb_rdatatype_t)(((uint32_t)ext) << 16) | \
+ (((uint32_t)base) & 0xffff))
+
+#define RBTDB_RDATATYPE_SIGNSEC \
+ RBTDB_RDATATYPE_VALUE(dns_rdatatype_rrsig, dns_rdatatype_nsec)
+#define RBTDB_RDATATYPE_SIGNSEC3 \
+ RBTDB_RDATATYPE_VALUE(dns_rdatatype_rrsig, dns_rdatatype_nsec3)
+#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_SIGDS \
+ RBTDB_RDATATYPE_VALUE(dns_rdatatype_rrsig, dns_rdatatype_ds)
+#define RBTDB_RDATATYPE_SIGSOA \
+ RBTDB_RDATATYPE_VALUE(dns_rdatatype_rrsig, dns_rdatatype_soa)
+#define RBTDB_RDATATYPE_NCACHEANY RBTDB_RDATATYPE_VALUE(0, dns_rdatatype_any)
+
+#define RBTDB_INITLOCK(l) isc_rwlock_init((l), 0, 0)
+#define RBTDB_DESTROYLOCK(l) isc_rwlock_destroy(l)
+#define RBTDB_LOCK(l, t) RWLOCK((l), (t))
+#define RBTDB_UNLOCK(l, t) RWUNLOCK((l), (t))
+
+/*
+ * Since node locking is sensitive to both performance and memory footprint,
+ * we need some trick here. If we have both high-performance rwlock and
+ * high performance and small-memory reference counters, we use rwlock for
+ * node lock and isc_refcount for node references. In this case, we don't have
+ * to protect the access to the counters by locks.
+ * Otherwise, we simply use ordinary mutex lock for node locking, and use
+ * simple integers as reference counters which is protected by the lock.
+ * In most cases, we can simply use wrapper macros such as NODE_LOCK and
+ * NODE_UNLOCK. In some other cases, however, we need to protect reference
+ * counters first and then protect other parts of a node as read-only data.
+ * Special additional macros, NODE_STRONGLOCK(), NODE_WEAKLOCK(), etc, are also
+ * provided for these special cases. When we can use the efficient backend
+ * routines, we should only protect the "other members" by NODE_WEAKLOCK(read).
+ * Otherwise, we should use NODE_STRONGLOCK() to protect the entire critical
+ * section including the access to the reference counter.
+ * Note that we cannot use NODE_LOCK()/NODE_UNLOCK() wherever the protected
+ * section is also protected by NODE_STRONGLOCK().
+ */
+typedef isc_rwlock_t nodelock_t;
+
+#define NODE_INITLOCK(l) isc_rwlock_init((l), 0, 0)
+#define NODE_DESTROYLOCK(l) isc_rwlock_destroy(l)
+#define NODE_LOCK(l, t) RWLOCK((l), (t))
+#define NODE_UNLOCK(l, t) RWUNLOCK((l), (t))
+#define NODE_TRYUPGRADE(l) isc_rwlock_tryupgrade(l)
+#define NODE_DOWNGRADE(l) isc_rwlock_downgrade(l)
+
+/*%
+ * Whether to rate-limit updating the LRU to avoid possible thread contention.
+ * Updating LRU requires write locking, so we don't do it every time the
+ * record is touched - only after some time passes.
+ */
+#ifndef DNS_RBTDB_LIMITLRUUPDATE
+#define DNS_RBTDB_LIMITLRUUPDATE 1
+#endif
+
+/*% Time after which we update LRU for glue records, 5 minutes */
+#define DNS_RBTDB_LRUUPDATE_GLUE 300
+/*% Time after which we update LRU for all other records, 10 minutes */
+#define DNS_RBTDB_LRUUPDATE_REGULAR 600
+
+/*
+ * Allow clients with a virtual time of up to 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 *neg;
+ void *negsig;
+ dns_rdatatype_t type;
+};
+
+typedef struct rdatasetheader {
+ /*%
+ * Locked by the owning node's lock.
+ */
+ rbtdb_serial_t serial;
+ dns_ttl_t rdh_ttl;
+ rbtdb_rdatatype_t type;
+ atomic_uint_least16_t attributes;
+ dns_trust_t trust;
+ atomic_uint_fast32_t last_refresh_fail_ts;
+ struct noqname *noqname;
+ struct noqname *closest;
+ unsigned int is_mmapped : 1;
+ unsigned int next_is_relative : 1;
+ unsigned int node_is_relative : 1;
+ unsigned int resign_lsb : 1;
+ /*%<
+ * 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.
+ */
+
+ atomic_uint_fast32_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.
+ */
+
+ dns_rbtnode_t *node;
+ isc_stdtime_t last_used;
+ ISC_LINK(struct rdatasetheader) link;
+
+ unsigned int heap_index;
+ /*%<
+ * Used for TTL-based cache cleaning.
+ */
+ isc_stdtime_t resign;
+ /*%<
+ * Case vector. If the bit is set then the corresponding
+ * character in the owner name needs to be AND'd with 0x20,
+ * rendering that character upper case.
+ */
+ unsigned char upper[32];
+} rdatasetheader_t;
+
+typedef ISC_LIST(rdatasetheader_t) rdatasetheaderlist_t;
+typedef ISC_LIST(dns_rbtnode_t) rbtnodelist_t;
+
+#define RDATASET_ATTR_NONEXISTENT 0x0001
+/*%< May be potentially served as stale data. */
+#define RDATASET_ATTR_STALE 0x0002
+#define RDATASET_ATTR_IGNORE 0x0004
+#define RDATASET_ATTR_RETAIN 0x0008
+#define RDATASET_ATTR_NXDOMAIN 0x0010
+#define RDATASET_ATTR_RESIGN 0x0020
+#define RDATASET_ATTR_STATCOUNT 0x0040
+#define RDATASET_ATTR_OPTOUT 0x0080
+#define RDATASET_ATTR_NEGATIVE 0x0100
+#define RDATASET_ATTR_PREFETCH 0x0200
+#define RDATASET_ATTR_CASESET 0x0400
+#define RDATASET_ATTR_ZEROTTL 0x0800
+#define RDATASET_ATTR_CASEFULLYLOWER 0x1000
+/*%< Ancient - awaiting cleanup. */
+#define RDATASET_ATTR_ANCIENT 0x2000
+#define RDATASET_ATTR_STALE_WINDOW 0x4000
+
+/*
+ * 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) \
+ ((atomic_load_acquire(&(header)->attributes) & \
+ RDATASET_ATTR_NONEXISTENT) == 0)
+#define NONEXISTENT(header) \
+ ((atomic_load_acquire(&(header)->attributes) & \
+ RDATASET_ATTR_NONEXISTENT) != 0)
+#define IGNORE(header) \
+ ((atomic_load_acquire(&(header)->attributes) & \
+ RDATASET_ATTR_IGNORE) != 0)
+#define RETAIN(header) \
+ ((atomic_load_acquire(&(header)->attributes) & \
+ RDATASET_ATTR_RETAIN) != 0)
+#define NXDOMAIN(header) \
+ ((atomic_load_acquire(&(header)->attributes) & \
+ RDATASET_ATTR_NXDOMAIN) != 0)
+#define STALE(header) \
+ ((atomic_load_acquire(&(header)->attributes) & RDATASET_ATTR_STALE) != \
+ 0)
+#define STALE_WINDOW(header) \
+ ((atomic_load_acquire(&(header)->attributes) & \
+ RDATASET_ATTR_STALE_WINDOW) != 0)
+#define RESIGN(header) \
+ ((atomic_load_acquire(&(header)->attributes) & \
+ RDATASET_ATTR_RESIGN) != 0)
+#define OPTOUT(header) \
+ ((atomic_load_acquire(&(header)->attributes) & \
+ RDATASET_ATTR_OPTOUT) != 0)
+#define NEGATIVE(header) \
+ ((atomic_load_acquire(&(header)->attributes) & \
+ RDATASET_ATTR_NEGATIVE) != 0)
+#define PREFETCH(header) \
+ ((atomic_load_acquire(&(header)->attributes) & \
+ RDATASET_ATTR_PREFETCH) != 0)
+#define CASESET(header) \
+ ((atomic_load_acquire(&(header)->attributes) & \
+ RDATASET_ATTR_CASESET) != 0)
+#define ZEROTTL(header) \
+ ((atomic_load_acquire(&(header)->attributes) & \
+ RDATASET_ATTR_ZEROTTL) != 0)
+#define CASEFULLYLOWER(header) \
+ ((atomic_load_acquire(&(header)->attributes) & \
+ RDATASET_ATTR_CASEFULLYLOWER) != 0)
+#define ANCIENT(header) \
+ ((atomic_load_acquire(&(header)->attributes) & \
+ RDATASET_ATTR_ANCIENT) != 0)
+#define STATCOUNT(header) \
+ ((atomic_load_acquire(&(header)->attributes) & \
+ RDATASET_ATTR_STATCOUNT) != 0)
+
+#define RDATASET_ATTR_GET(header, attribute) \
+ (atomic_load_acquire(&(header)->attributes) & attribute)
+#define RDATASET_ATTR_SET(header, attribute) \
+ atomic_fetch_or_release(&(header)->attributes, attribute)
+#define RDATASET_ATTR_CLR(header, attribute) \
+ atomic_fetch_and_release(&(header)->attributes, ~(attribute))
+
+#define ACTIVE(header, now) \
+ (((header)->rdh_ttl > (now)) || \
+ ((header)->rdh_ttl == (now) && ZEROTTL(header)))
+
+#define DEFAULT_NODE_LOCK_COUNT 7 /*%< Should be prime. */
+#define RBTDB_GLUE_TABLE_INIT_BITS 2U
+#define RBTDB_GLUE_TABLE_MAX_BITS 32U
+#define RBTDB_GLUE_TABLE_OVERCOMMIT 3
+
+#define GOLDEN_RATIO_32 0x61C88647
+#define HASHSIZE(bits) (UINT64_C(1) << (bits))
+
+static uint32_t
+hash_32(uint32_t val, unsigned int bits) {
+ REQUIRE(bits <= RBTDB_GLUE_TABLE_MAX_BITS);
+ /* High bits are more random. */
+ return (val * GOLDEN_RATIO_32 >> (32 - bits));
+}
+
+#define EXPIREDOK(rbtiterator) \
+ (((rbtiterator)->common.options & DNS_DB_EXPIREDOK) != 0)
+
+#define STALEOK(rbtiterator) \
+ (((rbtiterator)->common.options & DNS_DB_STALEOK) != 0)
+
+/*%
+ * Number of buckets for cache DB entries (locks, LRU lists, TTL heaps).
+ * There is a tradeoff issue about configuring this value: if this is too
+ * small, it may cause heavier contention between threads; if this is too large,
+ * LRU purge algorithm won't work well (entries tend to be purged prematurely).
+ * The default value should work well for most environments, but this can
+ * also be configurable at compilation time via the
+ * DNS_RBTDB_CACHE_NODE_LOCK_COUNT variable. This value must be larger than
+ * 1 due to the assumption of overmem_purge().
+ */
+#ifdef DNS_RBTDB_CACHE_NODE_LOCK_COUNT
+#if DNS_RBTDB_CACHE_NODE_LOCK_COUNT <= 1
+#error "DNS_RBTDB_CACHE_NODE_LOCK_COUNT must be larger than 1"
+#else /* if DNS_RBTDB_CACHE_NODE_LOCK_COUNT <= 1 */
+#define DEFAULT_CACHE_NODE_LOCK_COUNT DNS_RBTDB_CACHE_NODE_LOCK_COUNT
+#endif /* if DNS_RBTDB_CACHE_NODE_LOCK_COUNT <= 1 */
+#else /* ifdef DNS_RBTDB_CACHE_NODE_LOCK_COUNT */
+#define DEFAULT_CACHE_NODE_LOCK_COUNT 17
+#endif /* DNS_RBTDB_CACHE_NODE_LOCK_COUNT */
+
+typedef struct {
+ nodelock_t lock;
+ /* Protected in the refcount routines. */
+ isc_refcount_t references;
+ /* Locked by lock. */
+ bool exiting;
+} rbtdb_nodelock_t;
+
+typedef struct rbtdb_changed {
+ dns_rbtnode_t *node;
+ bool dirty;
+ ISC_LINK(struct rbtdb_changed) link;
+} rbtdb_changed_t;
+
+typedef ISC_LIST(rbtdb_changed_t) rbtdb_changedlist_t;
+
+typedef enum { dns_db_insecure, dns_db_partial, dns_db_secure } dns_db_secure_t;
+
+typedef struct dns_rbtdb dns_rbtdb_t;
+
+/* Reason for expiring a record from cache */
+typedef enum { expire_lru, expire_ttl, expire_flush } expire_t;
+
+typedef struct rbtdb_glue rbtdb_glue_t;
+
+typedef struct rbtdb_glue_table_node {
+ struct rbtdb_glue_table_node *next;
+ dns_rbtnode_t *node;
+ rbtdb_glue_t *glue_list;
+} rbtdb_glue_table_node_t;
+
+typedef enum {
+ rdataset_ttl_fresh,
+ rdataset_ttl_stale,
+ rdataset_ttl_ancient
+} rdataset_ttl_t;
+
+typedef struct rbtdb_version {
+ /* Not locked */
+ rbtdb_serial_t serial;
+ dns_rbtdb_t *rbtdb;
+ /*
+ * Protected in the refcount routines.
+ * XXXJT: should we change the lock policy based on the refcount
+ * performance?
+ */
+ isc_refcount_t references;
+ /* Locked by database lock. */
+ bool writer;
+ bool commit_ok;
+ rbtdb_changedlist_t changed_list;
+ rdatasetheaderlist_t resigned_list;
+ ISC_LINK(struct rbtdb_version) link;
+ dns_db_secure_t secure;
+ bool havensec3;
+ /* NSEC3 parameters */
+ dns_hash_t hash;
+ uint8_t flags;
+ uint16_t iterations;
+ uint8_t salt_length;
+ unsigned char salt[DNS_NSEC3_SALTSIZE];
+
+ /*
+ * records and xfrsize are covered by rwlock.
+ */
+ isc_rwlock_t rwlock;
+ uint64_t records;
+ uint64_t xfrsize;
+
+ isc_rwlock_t glue_rwlock;
+ size_t glue_table_bits;
+ size_t glue_table_nodecount;
+ rbtdb_glue_table_node_t **glue_table;
+} rbtdb_version_t;
+
+typedef ISC_LIST(rbtdb_version_t) rbtdb_versionlist_t;
+
+struct dns_rbtdb {
+ /* Unlocked. */
+ dns_db_t common;
+ /* Locks the data in this struct */
+ isc_rwlock_t lock;
+ /* Locks the tree structure (prevents nodes appearing/disappearing) */
+ isc_rwlock_t tree_lock;
+ /* Locks for individual tree nodes */
+ unsigned int node_lock_count;
+ rbtdb_nodelock_t *node_locks;
+ dns_rbtnode_t *origin_node;
+ dns_rbtnode_t *nsec3_origin_node;
+ dns_stats_t *rrsetstats; /* cache DB only */
+ isc_stats_t *cachestats; /* cache DB only */
+ isc_stats_t *gluecachestats; /* zone DB only */
+ /* 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_task_t *task;
+ dns_dbnode_t *soanode;
+ dns_dbnode_t *nsnode;
+
+ /*
+ * Maximum length of time to keep using a stale answer past its
+ * normal TTL expiry.
+ */
+ dns_ttl_t serve_stale_ttl;
+
+ /*
+ * The time after a failed lookup, where stale answers from cache
+ * may be used directly in a DNS response without attempting a
+ * new iterative lookup.
+ */
+ uint32_t serve_stale_refresh;
+
+ /*
+ * This is a linked list used to implement the LRU cache. There will
+ * be node_lock_count linked lists here. Nodes in bucket 1 will be
+ * placed on the linked list rdatasets[1].
+ */
+ rdatasetheaderlist_t *rdatasets;
+
+ /*%
+ * Temporary storage for stale cache nodes and dynamically deleted
+ * nodes that await being cleaned up.
+ */
+ rbtnodelist_t *deadnodes;
+
+ /*
+ * Heaps. These are used for TTL based expiry in a cache,
+ * or for zone resigning in a zone DB. hmctx is the memory
+ * context to use for the heap (which differs from the main
+ * database memory context in the case of a cache).
+ */
+ isc_mem_t *hmctx;
+ isc_heap_t **heaps;
+
+ /*
+ * Base values for the mmap() code.
+ */
+ void *mmap_location;
+ size_t mmap_size;
+
+ /* Locked by tree_lock. */
+ dns_rbt_t *tree;
+ dns_rbt_t *nsec;
+ dns_rbt_t *nsec3;
+
+ /* Unlocked */
+ unsigned int quantum;
+};
+
+#define RBTDB_ATTR_LOADED 0x01
+#define RBTDB_ATTR_LOADING 0x02
+
+#define KEEPSTALE(rbtdb) ((rbtdb)->serve_stale_ttl > 0)
+
+/*%
+ * Search Context
+ */
+typedef struct {
+ dns_rbtdb_t *rbtdb;
+ rbtdb_version_t *rbtversion;
+ rbtdb_serial_t serial;
+ unsigned int options;
+ dns_rbtnodechain_t chain;
+ bool copy_name;
+ bool need_cleanup;
+ bool 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
+delete_callback(void *data, void *arg);
+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 *neg, dns_rdataset_t *negsig);
+static isc_result_t
+rdataset_getclosest(dns_rdataset_t *rdataset, dns_name_t *name,
+ dns_rdataset_t *neg, dns_rdataset_t *negsig);
+static bool
+need_headerupdate(rdatasetheader_t *header, isc_stdtime_t now);
+static void
+update_header(dns_rbtdb_t *rbtdb, rdatasetheader_t *header, isc_stdtime_t now);
+static void
+expire_header(dns_rbtdb_t *rbtdb, rdatasetheader_t *header, bool tree_locked,
+ expire_t reason);
+static void
+overmem_purge(dns_rbtdb_t *rbtdb, unsigned int locknum_start, size_t purgesize,
+ bool tree_locked);
+static void
+resign_insert(dns_rbtdb_t *rbtdb, int idx, rdatasetheader_t *newheader);
+static void
+resign_delete(dns_rbtdb_t *rbtdb, rbtdb_version_t *version,
+ rdatasetheader_t *header);
+static void
+prune_tree(isc_task_t *task, isc_event_t *event);
+static void
+rdataset_settrust(dns_rdataset_t *rdataset, dns_trust_t trust);
+static void
+rdataset_expire(dns_rdataset_t *rdataset);
+static void
+rdataset_clearprefetch(dns_rdataset_t *rdataset);
+static void
+rdataset_setownercase(dns_rdataset_t *rdataset, const dns_name_t *name);
+static void
+rdataset_getownercase(const dns_rdataset_t *rdataset, dns_name_t *name);
+static isc_result_t
+rdataset_addglue(dns_rdataset_t *rdataset, dns_dbversion_t *version,
+ dns_message_t *msg);
+static void
+free_gluetable(rbtdb_version_t *version);
+static isc_result_t
+nodefullname(dns_db_t *db, dns_dbnode_t *node, dns_name_t *name);
+
+static dns_rdatasetmethods_t rdataset_methods = { rdataset_disassociate,
+ rdataset_first,
+ rdataset_next,
+ rdataset_current,
+ rdataset_clone,
+ rdataset_count,
+ NULL, /* addnoqname */
+ rdataset_getnoqname,
+ NULL, /* addclosest */
+ rdataset_getclosest,
+ rdataset_settrust,
+ rdataset_expire,
+ rdataset_clearprefetch,
+ rdataset_setownercase,
+ rdataset_getownercase,
+ rdataset_addglue };
+
+static dns_rdatasetmethods_t slab_methods = {
+ rdataset_disassociate,
+ rdataset_first,
+ rdataset_next,
+ rdataset_current,
+ rdataset_clone,
+ rdataset_count,
+ NULL, /* addnoqname */
+ NULL, /* getnoqname */
+ NULL, /* addclosest */
+ NULL, /* getclosest */
+ NULL, /* settrust */
+ NULL, /* expire */
+ NULL, /* clearprefetch */
+ NULL, /* setownercase */
+ NULL, /* getownercase */
+ NULL /* addglue */
+};
+
+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;
+
+/*
+ * Note that these iterators, unless created with either DNS_DB_NSEC3ONLY or
+ * DNS_DB_NONSEC3, will transparently move between the last node of the
+ * "regular" RBT ("chain" field) and the root node of the NSEC3 RBT
+ * ("nsec3chain" field) of the database in question, as if the latter was a
+ * successor to the former in lexical order. The "current" field always holds
+ * the address of either "chain" or "nsec3chain", depending on which RBT is
+ * being traversed at given time.
+ */
+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, const 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 true, then the tree lock is not being held.
+ */
+typedef struct rbtdb_dbiterator {
+ dns_dbiterator_t common;
+ bool paused;
+ bool new_origin;
+ isc_rwlocktype_t tree_locked;
+ isc_result_t result;
+ dns_fixedname_t name;
+ dns_fixedname_t origin;
+ dns_rbtnodechain_t chain;
+ dns_rbtnodechain_t nsec3chain;
+ dns_rbtnodechain_t *current;
+ dns_rbtnode_t *node;
+ dns_rbtnode_t *deletions[DELETION_BATCH_MAX];
+ int delcnt;
+ bool nsec3only;
+ bool nonsec3;
+} 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, bool log, isc_event_t *event);
+static void
+overmem(dns_db_t *db, bool over);
+static void
+setnsec3parameters(dns_db_t *db, rbtdb_version_t *version);
+static void
+setownercase(rdatasetheader_t *header, const dns_name_t *name);
+
+static bool
+match_header_version(rbtdb_file_header_t *header);
+
+/* Pad to 32 bytes */
+static char FILE_VERSION[32] = "\0";
+
+/*%
+ * 'init_count' is used to initialize 'newheader->count' which inturn
+ * is used to determine where in the cycle rrset-order cyclic starts.
+ * We don't lock this as we don't care about simultaneous updates.
+ *
+ * Note:
+ * Both init_count and header->count can be UINT32_MAX.
+ * The count on the returned rdataset however can't be as
+ * that indicates that the database does not implement cyclic
+ * processing.
+ */
+static atomic_uint_fast32_t init_count = 0;
+
+/*
+ * 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
+ *
+ * For zone databases the node for the origin of the zone MUST NOT be deleted.
+ */
+
+/*
+ * Debugging routines
+ */
+#ifdef DEBUG
+static void
+hexdump(const char *desc, unsigned char *data, size_t size) {
+ char hexdump[BUFSIZ * 2 + 1];
+ isc_buffer_t b;
+ isc_region_t r;
+ isc_result_t result;
+ size_t bytes;
+
+ fprintf(stderr, "%s: ", desc);
+ do {
+ isc_buffer_init(&b, hexdump, sizeof(hexdump));
+ r.base = data;
+ r.length = bytes = (size > BUFSIZ) ? BUFSIZ : size;
+ result = isc_hex_totext(&r, 0, "", &b);
+ RUNTIME_CHECK(result == ISC_R_SUCCESS);
+ isc_buffer_putuint8(&b, 0);
+ fprintf(stderr, "%s", hexdump);
+ data += bytes;
+ size -= bytes;
+ } while (size > 0);
+ fprintf(stderr, "\n");
+}
+#endif /* ifdef DEBUG */
+
+/* Fixed RRSet helper macros */
+
+#define DNS_RDATASET_LENGTH 2;
+
+#if DNS_RDATASET_FIXED
+#define DNS_RDATASET_ORDER 2
+#define DNS_RDATASET_COUNT (count * 4)
+#else /* !DNS_RDATASET_FIXED */
+#define DNS_RDATASET_ORDER 0
+#define DNS_RDATASET_COUNT 0
+#endif /* DNS_RDATASET_FIXED */
+
+/*
+ * 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);
+
+ *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, true, event);
+}
+
+static void
+update_cachestats(dns_rbtdb_t *rbtdb, isc_result_t result) {
+ INSIST(IS_CACHE(rbtdb));
+
+ if (rbtdb->cachestats == NULL) {
+ return;
+ }
+
+ switch (result) {
+ case ISC_R_SUCCESS:
+ case DNS_R_CNAME:
+ case DNS_R_DNAME:
+ case DNS_R_DELEGATION:
+ case DNS_R_NCACHENXDOMAIN:
+ case DNS_R_NCACHENXRRSET:
+ isc_stats_increment(rbtdb->cachestats,
+ dns_cachestatscounter_hits);
+ break;
+ default:
+ isc_stats_increment(rbtdb->cachestats,
+ dns_cachestatscounter_misses);
+ }
+}
+
+static bool
+do_stats(rdatasetheader_t *header) {
+ return (EXISTS(header) && STATCOUNT(header));
+}
+
+static void
+update_rrsetstats(dns_rbtdb_t *rbtdb, const rbtdb_rdatatype_t htype,
+ const uint_least16_t hattributes, const bool increment) {
+ dns_rdatastatstype_t statattributes = 0;
+ dns_rdatastatstype_t base = 0;
+ dns_rdatastatstype_t type;
+ rdatasetheader_t *header = &(rdatasetheader_t){
+ .type = htype,
+ .attributes = hattributes,
+ };
+
+ if (!do_stats(header)) {
+ return;
+ }
+
+ /* At the moment we count statistics only for cache DB */
+ INSIST(IS_CACHE(rbtdb));
+
+ if (NEGATIVE(header)) {
+ if (NXDOMAIN(header)) {
+ statattributes = DNS_RDATASTATSTYPE_ATTR_NXDOMAIN;
+ } else {
+ statattributes = DNS_RDATASTATSTYPE_ATTR_NXRRSET;
+ base = RBTDB_RDATATYPE_EXT(header->type);
+ }
+ } else {
+ base = RBTDB_RDATATYPE_BASE(header->type);
+ }
+
+ if (STALE(header)) {
+ statattributes |= DNS_RDATASTATSTYPE_ATTR_STALE;
+ }
+ if (ANCIENT(header)) {
+ statattributes |= DNS_RDATASTATSTYPE_ATTR_ANCIENT;
+ }
+
+ type = DNS_RDATASTATSTYPE_VALUE(base, statattributes);
+ if (increment) {
+ dns_rdatasetstats_increment(rbtdb->rrsetstats, type);
+ } else {
+ dns_rdatasetstats_decrement(rbtdb->rrsetstats, type);
+ }
+}
+
+static void
+set_ttl(dns_rbtdb_t *rbtdb, rdatasetheader_t *header, dns_ttl_t newttl) {
+ int idx;
+ isc_heap_t *heap;
+ dns_ttl_t oldttl;
+
+ if (!IS_CACHE(rbtdb)) {
+ header->rdh_ttl = newttl;
+ return;
+ }
+
+ oldttl = header->rdh_ttl;
+ header->rdh_ttl = newttl;
+
+ /*
+ * It's possible the rbtdb is not a cache. If this is the case,
+ * we will not have a heap, and we move on. If we do, though,
+ * we might need to adjust things.
+ */
+ if (header->heap_index == 0 || newttl == oldttl) {
+ return;
+ }
+ idx = header->node->locknum;
+ if (rbtdb->heaps == NULL || rbtdb->heaps[idx] == NULL) {
+ return;
+ }
+ heap = rbtdb->heaps[idx];
+
+ if (newttl < oldttl) {
+ isc_heap_increased(heap, header->heap_index);
+ } else {
+ isc_heap_decreased(heap, header->heap_index);
+ }
+}
+
+/*%
+ * These functions allow the heap code to rank the priority of each
+ * element. It returns true if v1 happens "sooner" than v2.
+ */
+static bool
+ttl_sooner(void *v1, void *v2) {
+ rdatasetheader_t *h1 = v1;
+ rdatasetheader_t *h2 = v2;
+
+ return (h1->rdh_ttl < h2->rdh_ttl);
+}
+
+/*%
+ * Return which RRset should be resigned sooner. If the RRsets have the
+ * same signing time, prefer the other RRset over the SOA RRset.
+ */
+static bool
+resign_sooner(void *v1, void *v2) {
+ rdatasetheader_t *h1 = v1;
+ rdatasetheader_t *h2 = v2;
+
+ return (h1->resign < h2->resign ||
+ (h1->resign == h2->resign && h1->resign_lsb < h2->resign_lsb) ||
+ (h1->resign == h2->resign && h1->resign_lsb == h2->resign_lsb &&
+ h2->type == RBTDB_RDATATYPE_SIGSOA));
+}
+
+/*%
+ * This function sets the heap index into the header.
+ */
+static void
+set_index(void *what, unsigned int idx) {
+ rdatasetheader_t *h = what;
+
+ h->heap_index = idx;
+}
+
+/*%
+ * Work out how many nodes can be deleted in the time between two
+ * requests to the nameserver. Smooth the resulting number and use it
+ * as a estimate for the number of nodes to be deleted in the next
+ * iteration.
+ */
+static unsigned int
+adjust_quantum(unsigned int old, isc_time_t *start) {
+ unsigned int pps = dns_pps; /* packets per second */
+ unsigned int interval;
+ uint64_t usecs;
+ isc_time_t end;
+ unsigned int nodes;
+
+ if (pps < 100) {
+ pps = 100;
+ }
+ isc_time_now(&end);
+
+ interval = 1000000 / pps; /* interval in usec */
+ if (interval == 0) {
+ interval = 1;
+ }
+ usecs = isc_time_microdiff(&end, start);
+ if (usecs == 0) {
+ /*
+ * We were unable to measure the amount of time taken.
+ * Double the nodes deleted next time.
+ */
+ old *= 2;
+ if (old > 1000) {
+ old = 1000;
+ }
+ return (old);
+ }
+ nodes = old * interval;
+ nodes /= (unsigned int)usecs;
+ if (nodes == 0) {
+ nodes = 1;
+ } else if (nodes > 1000) {
+ nodes = 1000;
+ }
+
+ /* Smooth */
+ nodes = (nodes + old * 3) / 4;
+
+ if (nodes != old) {
+ isc_log_write(dns_lctx, DNS_LOGCATEGORY_DATABASE,
+ DNS_LOGMODULE_CACHE, ISC_LOG_DEBUG(1),
+ "adjust_quantum: old=%d, new=%d", old, nodes);
+ }
+
+ return (nodes);
+}
+
+static void
+free_rbtdb(dns_rbtdb_t *rbtdb, bool log, isc_event_t *event) {
+ unsigned int i;
+ isc_result_t result;
+ char buf[DNS_NAME_FORMATSIZE];
+ dns_rbt_t **treep;
+ isc_time_t start;
+
+ if (IS_CACHE(rbtdb) && rbtdb->common.rdclass == dns_rdataclass_in) {
+ overmem((dns_db_t *)rbtdb, (bool)-1);
+ }
+
+ REQUIRE(rbtdb->current_version != NULL || EMPTY(rbtdb->open_versions));
+ REQUIRE(rbtdb->future_version == NULL);
+
+ if (rbtdb->current_version != NULL) {
+ isc_refcount_decrementz(&rbtdb->current_version->references);
+ UNLINK(rbtdb->open_versions, rbtdb->current_version, link);
+ isc_rwlock_destroy(&rbtdb->current_version->glue_rwlock);
+ isc_refcount_destroy(&rbtdb->current_version->references);
+ isc_rwlock_destroy(&rbtdb->current_version->rwlock);
+ isc_mem_put(rbtdb->common.mctx, rbtdb->current_version,
+ sizeof(rbtdb_version_t));
+ }
+
+ /*
+ * We assume the number of remaining dead nodes is reasonably small;
+ * the overhead of unlinking all nodes here should be negligible.
+ */
+ for (i = 0; i < rbtdb->node_lock_count; i++) {
+ dns_rbtnode_t *node;
+
+ node = ISC_LIST_HEAD(rbtdb->deadnodes[i]);
+ while (node != NULL) {
+ ISC_LIST_UNLINK(rbtdb->deadnodes[i], node, deadlink);
+ node = ISC_LIST_HEAD(rbtdb->deadnodes[i]);
+ }
+ }
+
+ if (event == NULL) {
+ rbtdb->quantum = (rbtdb->task != NULL) ? 100 : 0;
+ }
+
+ for (;;) {
+ /*
+ * pick the next tree to (start to) destroy
+ */
+ treep = &rbtdb->tree;
+ if (*treep == NULL) {
+ treep = &rbtdb->nsec;
+ if (*treep == NULL) {
+ treep = &rbtdb->nsec3;
+ /*
+ * we're finished after clear cutting
+ */
+ if (*treep == NULL) {
+ break;
+ }
+ }
+ }
+
+ isc_time_now(&start);
+ result = dns_rbt_destroy2(treep, rbtdb->quantum);
+ if (result == ISC_R_QUOTA) {
+ INSIST(rbtdb->task != NULL);
+ if (rbtdb->quantum != 0) {
+ rbtdb->quantum = adjust_quantum(rbtdb->quantum,
+ &start);
+ }
+ if (event == NULL) {
+ event = isc_event_allocate(
+ rbtdb->common.mctx, NULL,
+ DNS_EVENT_FREESTORAGE,
+ free_rbtdb_callback, rbtdb,
+ sizeof(isc_event_t));
+ }
+ isc_task_send(rbtdb->task, &event);
+ return;
+ }
+ INSIST(result == ISC_R_SUCCESS && *treep == 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 {
+ strlcpy(buf, "<UNKNOWN>", sizeof(buf));
+ }
+ 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++) {
+ isc_refcount_destroy(&rbtdb->node_locks[i].references);
+ NODE_DESTROYLOCK(&rbtdb->node_locks[i].lock);
+ }
+
+ /*
+ * Clean up LRU / re-signing order lists.
+ */
+ if (rbtdb->rdatasets != NULL) {
+ for (i = 0; i < rbtdb->node_lock_count; i++) {
+ INSIST(ISC_LIST_EMPTY(rbtdb->rdatasets[i]));
+ }
+ isc_mem_put(rbtdb->common.mctx, rbtdb->rdatasets,
+ rbtdb->node_lock_count *
+ sizeof(rdatasetheaderlist_t));
+ }
+ /*
+ * Clean up dead node buckets.
+ */
+ if (rbtdb->deadnodes != NULL) {
+ for (i = 0; i < rbtdb->node_lock_count; i++) {
+ INSIST(ISC_LIST_EMPTY(rbtdb->deadnodes[i]));
+ }
+ isc_mem_put(rbtdb->common.mctx, rbtdb->deadnodes,
+ rbtdb->node_lock_count * sizeof(rbtnodelist_t));
+ }
+ /*
+ * Clean up heap objects.
+ */
+ if (rbtdb->heaps != NULL) {
+ for (i = 0; i < rbtdb->node_lock_count; i++) {
+ isc_heap_destroy(&rbtdb->heaps[i]);
+ }
+ isc_mem_put(rbtdb->hmctx, rbtdb->heaps,
+ rbtdb->node_lock_count * sizeof(isc_heap_t *));
+ }
+
+ if (rbtdb->rrsetstats != NULL) {
+ dns_stats_detach(&rbtdb->rrsetstats);
+ }
+ if (rbtdb->cachestats != NULL) {
+ isc_stats_detach(&rbtdb->cachestats);
+ }
+ if (rbtdb->gluecachestats != NULL) {
+ isc_stats_detach(&rbtdb->gluecachestats);
+ }
+
+ 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);
+ }
+
+ RBTDB_DESTROYLOCK(&rbtdb->lock);
+ rbtdb->common.magic = 0;
+ rbtdb->common.impmagic = 0;
+ isc_mem_detach(&rbtdb->hmctx);
+
+ if (rbtdb->mmap_location != NULL) {
+ isc_file_munmap(rbtdb->mmap_location, (size_t)rbtdb->mmap_size);
+ }
+
+ INSIST(ISC_LIST_EMPTY(rbtdb->common.update_listeners));
+
+ isc_mem_putanddetach(&rbtdb->common.mctx, rbtdb, sizeof(*rbtdb));
+}
+
+static void
+maybe_free_rbtdb(dns_rbtdb_t *rbtdb) {
+ bool want_free = false;
+ unsigned int i;
+ unsigned int inactive = 0;
+
+ /* XXX check for open versions here */
+
+ if (rbtdb->soanode != NULL) {
+ dns_db_detachnode((dns_db_t *)rbtdb, &rbtdb->soanode);
+ }
+ if (rbtdb->nsnode != NULL) {
+ dns_db_detachnode((dns_db_t *)rbtdb, &rbtdb->nsnode);
+ }
+
+ /*
+ * The current version's glue table needs to be freed early
+ * so the nodes are dereferenced before we check the active
+ * node count below.
+ */
+ if (rbtdb->current_version != NULL) {
+ free_gluetable(rbtdb->current_version);
+ }
+
+ /*
+ * Even though there are no external direct references, there still
+ * may be nodes in use.
+ */
+ for (i = 0; i < rbtdb->node_lock_count; i++) {
+ NODE_LOCK(&rbtdb->node_locks[i].lock, isc_rwlocktype_write);
+ rbtdb->node_locks[i].exiting = true;
+ if (isc_refcount_current(&rbtdb->node_locks[i].references) == 0)
+ {
+ inactive++;
+ }
+ NODE_UNLOCK(&rbtdb->node_locks[i].lock, isc_rwlocktype_write);
+ }
+
+ if (inactive != 0) {
+ RBTDB_LOCK(&rbtdb->lock, isc_rwlocktype_write);
+ rbtdb->active -= inactive;
+ if (rbtdb->active == 0) {
+ want_free = true;
+ }
+ RBTDB_UNLOCK(&rbtdb->lock, isc_rwlocktype_write);
+ 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 {
+ strlcpy(buf, "<UNKNOWN>", sizeof(buf));
+ }
+ isc_log_write(dns_lctx, DNS_LOGCATEGORY_DATABASE,
+ DNS_LOGMODULE_CACHE, ISC_LOG_DEBUG(1),
+ "calling free_rbtdb(%s)", buf);
+ free_rbtdb(rbtdb, true, NULL);
+ }
+ }
+}
+
+static void
+detach(dns_db_t **dbp) {
+ REQUIRE(dbp != NULL && VALID_RBTDB((dns_rbtdb_t *)(*dbp)));
+ dns_rbtdb_t *rbtdb = (dns_rbtdb_t *)(*dbp);
+ *dbp = NULL;
+
+ if (isc_refcount_decrement(&rbtdb->references) == 1) {
+ maybe_free_rbtdb(rbtdb);
+ }
+}
+
+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));
+
+ RBTDB_LOCK(&rbtdb->lock, isc_rwlocktype_read);
+ version = rbtdb->current_version;
+ isc_refcount_increment(&version->references);
+ RBTDB_UNLOCK(&rbtdb->lock, isc_rwlocktype_read);
+
+ *versionp = (dns_dbversion_t *)version;
+}
+
+static rbtdb_version_t *
+allocate_version(isc_mem_t *mctx, rbtdb_serial_t serial,
+ unsigned int references, bool writer) {
+ rbtdb_version_t *version;
+ size_t size;
+
+ version = isc_mem_get(mctx, sizeof(*version));
+ version->serial = serial;
+
+ isc_refcount_init(&version->references, references);
+ isc_rwlock_init(&version->glue_rwlock, 0, 0);
+
+ version->glue_table_bits = RBTDB_GLUE_TABLE_INIT_BITS;
+ version->glue_table_nodecount = 0U;
+
+ size = HASHSIZE(version->glue_table_bits) *
+ sizeof(version->glue_table[0]);
+ version->glue_table = isc_mem_get(mctx, size);
+ memset(version->glue_table, 0, size);
+
+ version->writer = writer;
+ version->commit_ok = false;
+ ISC_LIST_INIT(version->changed_list);
+ ISC_LIST_INIT(version->resigned_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);
+
+ RBTDB_LOCK(&rbtdb->lock, isc_rwlocktype_write);
+ RUNTIME_CHECK(rbtdb->next_serial != 0); /* XXX Error? */
+ version = allocate_version(rbtdb->common.mctx, rbtdb->next_serial, 1,
+ true);
+ version->rbtdb = rbtdb;
+ version->commit_ok = true;
+ version->secure = rbtdb->current_version->secure;
+ version->havensec3 = rbtdb->current_version->havensec3;
+ if (version->havensec3) {
+ version->flags = rbtdb->current_version->flags;
+ version->iterations = rbtdb->current_version->iterations;
+ version->hash = rbtdb->current_version->hash;
+ version->salt_length = rbtdb->current_version->salt_length;
+ memmove(version->salt, rbtdb->current_version->salt,
+ version->salt_length);
+ } else {
+ version->flags = 0;
+ version->iterations = 0;
+ version->hash = 0;
+ version->salt_length = 0;
+ memset(version->salt, 0, sizeof(version->salt));
+ }
+ isc_rwlock_init(&version->rwlock, 0, 0);
+ RWLOCK(&rbtdb->current_version->rwlock, isc_rwlocktype_read);
+ version->records = rbtdb->current_version->records;
+ version->xfrsize = rbtdb->current_version->xfrsize;
+ RWUNLOCK(&rbtdb->current_version->rwlock, isc_rwlocktype_read);
+ rbtdb->next_serial++;
+ rbtdb->future_version = version;
+ RBTDB_UNLOCK(&rbtdb->lock, isc_rwlocktype_write);
+
+ *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));
+ INSIST(rbtversion != NULL && rbtversion->rbtdb == rbtdb);
+
+ isc_refcount_increment(&rbtversion->references);
+
+ *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 if its reference must be
+ * protected by the lock.
+ */
+
+ changed = isc_mem_get(rbtdb->common.mctx, sizeof(*changed));
+
+ RBTDB_LOCK(&rbtdb->lock, isc_rwlocktype_write);
+
+ REQUIRE(version->writer);
+
+ if (changed != NULL) {
+ isc_refcount_increment(&node->references);
+ changed->node = node;
+ changed->dirty = false;
+ ISC_LIST_INITANDAPPEND(version->changed_list, changed, link);
+ } else {
+ version->commit_ok = false;
+ }
+
+ RBTDB_UNLOCK(&rbtdb->lock, isc_rwlocktype_write);
+
+ return (changed);
+}
+
+static void
+free_noqname(isc_mem_t *mctx, struct noqname **noqname) {
+ if (dns_name_dynamic(&(*noqname)->name)) {
+ dns_name_free(&(*noqname)->name, mctx);
+ }
+ if ((*noqname)->neg != NULL) {
+ isc_mem_put(mctx, (*noqname)->neg,
+ dns_rdataslab_size((*noqname)->neg, 0));
+ }
+ if ((*noqname)->negsig != NULL) {
+ isc_mem_put(mctx, (*noqname)->negsig,
+ dns_rdataslab_size((*noqname)->negsig, 0));
+ }
+ isc_mem_put(mctx, *noqname, sizeof(**noqname));
+ *noqname = NULL;
+}
+
+static void
+init_rdataset(dns_rbtdb_t *rbtdb, rdatasetheader_t *h) {
+ ISC_LINK_INIT(h, link);
+ h->heap_index = 0;
+ h->is_mmapped = 0;
+ h->next_is_relative = 0;
+ h->node_is_relative = 0;
+ atomic_init(&h->attributes, 0);
+ atomic_init(&h->last_refresh_fail_ts, 0);
+
+ STATIC_ASSERT((sizeof(h->attributes) == 2),
+ "The .attributes field of rdatasetheader_t needs to be "
+ "16-bit int type exactly.");
+
+#if TRACE_HEADER
+ if (IS_CACHE(rbtdb) && rbtdb->common.rdclass == dns_rdataclass_in) {
+ fprintf(stderr, "initialized header: %p\n", h);
+ }
+#else /* if TRACE_HEADER */
+ UNUSED(rbtdb);
+#endif /* if TRACE_HEADER */
+}
+
+/*
+ * Update the copied values of 'next' and 'node' if they are relative.
+ */
+static void
+update_newheader(rdatasetheader_t *newh, rdatasetheader_t *old) {
+ char *p;
+
+ if (old->next_is_relative) {
+ p = (char *)old;
+ p += (uintptr_t)old->next;
+ newh->next = (rdatasetheader_t *)p;
+ }
+ if (old->node_is_relative) {
+ p = (char *)old;
+ p += (uintptr_t)old->node;
+ newh->node = (dns_rbtnode_t *)p;
+ }
+ if (CASESET(old)) {
+ uint_least16_t attr = RDATASET_ATTR_GET(
+ old,
+ (RDATASET_ATTR_CASESET | RDATASET_ATTR_CASEFULLYLOWER));
+ RDATASET_ATTR_SET(newh, attr);
+ memmove(newh->upper, old->upper, sizeof(old->upper));
+ }
+}
+
+static rdatasetheader_t *
+new_rdataset(dns_rbtdb_t *rbtdb, isc_mem_t *mctx) {
+ rdatasetheader_t *h;
+
+ h = isc_mem_get(mctx, sizeof(*h));
+
+#if TRACE_HEADER
+ if (IS_CACHE(rbtdb) && rbtdb->common.rdclass == dns_rdataclass_in) {
+ fprintf(stderr, "allocated header: %p\n", h);
+ }
+#endif /* if TRACE_HEADER */
+ memset(h->upper, 0xeb, sizeof(h->upper));
+ init_rdataset(rbtdb, h);
+ h->rdh_ttl = 0;
+ return (h);
+}
+
+static void
+free_rdataset(dns_rbtdb_t *rbtdb, isc_mem_t *mctx, rdatasetheader_t *rdataset) {
+ unsigned int size;
+ int idx;
+
+ update_rrsetstats(rbtdb, rdataset->type,
+ atomic_load_acquire(&rdataset->attributes), false);
+
+ idx = rdataset->node->locknum;
+ if (ISC_LINK_LINKED(rdataset, link)) {
+ INSIST(IS_CACHE(rbtdb));
+ ISC_LIST_UNLINK(rbtdb->rdatasets[idx], rdataset, link);
+ }
+
+ if (rdataset->heap_index != 0) {
+ isc_heap_delete(rbtdb->heaps[idx], rdataset->heap_index);
+ }
+ rdataset->heap_index = 0;
+
+ if (rdataset->noqname != NULL) {
+ free_noqname(mctx, &rdataset->noqname);
+ }
+ if (rdataset->closest != NULL) {
+ free_noqname(mctx, &rdataset->closest);
+ }
+
+ if (NONEXISTENT(rdataset)) {
+ size = sizeof(*rdataset);
+ } else {
+ size = dns_rdataslab_size((unsigned char *)rdataset,
+ sizeof(*rdataset));
+ }
+
+ if (rdataset->is_mmapped == 1) {
+ return;
+ }
+
+ isc_mem_put(mctx, rdataset, size);
+}
+
+static void
+rollback_node(dns_rbtnode_t *node, rbtdb_serial_t serial) {
+ rdatasetheader_t *header, *dcurrent;
+ bool make_dirty = 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) {
+ RDATASET_ATTR_SET(header, RDATASET_ATTR_IGNORE);
+ make_dirty = true;
+ }
+ for (dcurrent = header->down; dcurrent != NULL;
+ dcurrent = dcurrent->down)
+ {
+ if (dcurrent->serial == serial) {
+ RDATASET_ATTR_SET(dcurrent,
+ RDATASET_ATTR_IGNORE);
+ make_dirty = true;
+ }
+ }
+ }
+ if (make_dirty) {
+ node->dirty = 1;
+ }
+}
+
+static void
+mark_header_ancient(dns_rbtdb_t *rbtdb, rdatasetheader_t *header) {
+ uint_least16_t attributes = atomic_load_acquire(&header->attributes);
+ uint_least16_t newattributes = 0;
+
+ /*
+ * If we are already ancient there is nothing to do.
+ */
+ do {
+ if ((attributes & RDATASET_ATTR_ANCIENT) != 0) {
+ return;
+ }
+ newattributes = attributes | RDATASET_ATTR_ANCIENT;
+ } while (!atomic_compare_exchange_weak_acq_rel(
+ &header->attributes, &attributes, newattributes));
+
+ /*
+ * Decrement the stats counter for the appropriate RRtype.
+ * If the STALE attribute is set, this will decrement the
+ * stale type counter, otherwise it decrements the active
+ * stats type counter.
+ */
+ update_rrsetstats(rbtdb, header->type, attributes, false);
+ header->node->dirty = 1;
+
+ /* Increment the stats counter for the ancient RRtype. */
+ update_rrsetstats(rbtdb, header->type, newattributes, true);
+}
+
+static void
+mark_header_stale(dns_rbtdb_t *rbtdb, rdatasetheader_t *header) {
+ uint_least16_t attributes = atomic_load_acquire(&header->attributes);
+ uint_least16_t newattributes = 0;
+
+ INSIST((attributes & RDATASET_ATTR_ZEROTTL) == 0);
+
+ /*
+ * If we are already stale there is nothing to do.
+ */
+ do {
+ if ((attributes & RDATASET_ATTR_STALE) != 0) {
+ return;
+ }
+ newattributes = attributes | RDATASET_ATTR_STALE;
+ } while (!atomic_compare_exchange_weak_acq_rel(
+ &header->attributes, &attributes, newattributes));
+
+ /* Decrement the stats counter for the appropriate RRtype.
+ * If the ANCIENT attribute is set (although it is very
+ * unlikely that an RRset goes from ANCIENT to STALE), this
+ * will decrement the ancient stale type counter, otherwise it
+ * decrements the active stats type counter.
+ */
+
+ update_rrsetstats(rbtdb, header->type, attributes, false);
+ update_rrsetstats(rbtdb, header->type, newattributes, true);
+}
+
+static void
+clean_stale_headers(dns_rbtdb_t *rbtdb, isc_mem_t *mctx,
+ rdatasetheader_t *top) {
+ rdatasetheader_t *d, *down_next;
+
+ for (d = top->down; d != NULL; d = down_next) {
+ down_next = d->down;
+ free_rdataset(rbtdb, mctx, d);
+ }
+ top->down = NULL;
+}
+
+static void
+clean_cache_node(dns_rbtdb_t *rbtdb, dns_rbtnode_t *node) {
+ rdatasetheader_t *current, *top_prev, *top_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;
+ clean_stale_headers(rbtdb, mctx, current);
+ /*
+ * If current is nonexistent, ancient, or stale and
+ * we are not keeping stale, we can clean it up.
+ */
+ if (NONEXISTENT(current) || ANCIENT(current) ||
+ (STALE(current) && !KEEPSTALE(rbtdb)))
+ {
+ if (top_prev != NULL) {
+ top_prev->next = current->next;
+ } else {
+ node->data = current->next;
+ }
+ free_rdataset(rbtdb, mctx, current);
+ } else {
+ top_prev = current;
+ }
+ }
+ node->dirty = 0;
+}
+
+static 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;
+ bool still_dirty = 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(rbtdb, 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(rbtdb, 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(rbtdb, 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(rbtdb, 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 = 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(rbtdb, mctx, current);
+ } else {
+ top_prev = current;
+ }
+ }
+ }
+ if (!still_dirty) {
+ node->dirty = 0;
+ }
+}
+
+/*
+ * tree_lock(write) must be held.
+ */
+static void
+delete_node(dns_rbtdb_t *rbtdb, dns_rbtnode_t *node) {
+ dns_rbtnode_t *nsecnode;
+ dns_fixedname_t fname;
+ dns_name_t *name;
+ isc_result_t result = ISC_R_UNEXPECTED;
+
+ INSIST(!ISC_LINK_LINKED(node, deadlink));
+
+ 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),
+ "delete_node(): %p %s (bucket %d)", node,
+ dns_rbt_formatnodename(node, printname,
+ sizeof(printname)),
+ node->locknum);
+ }
+
+ switch (node->nsec) {
+ case DNS_RBT_NSEC_NORMAL:
+ /*
+ * Though this may be wasteful, it has to be done before
+ * node is deleted.
+ */
+ name = dns_fixedname_initname(&fname);
+ dns_rbt_fullnamefromnode(node, name);
+
+ result = dns_rbt_deletenode(rbtdb->tree, node, false);
+ break;
+ case DNS_RBT_NSEC_HAS_NSEC:
+ name = dns_fixedname_initname(&fname);
+ dns_rbt_fullnamefromnode(node, name);
+ /*
+ * Delete the corresponding node from the auxiliary NSEC
+ * tree before deleting from the main tree.
+ */
+ nsecnode = NULL;
+ result = dns_rbt_findnode(rbtdb->nsec, name, NULL, &nsecnode,
+ NULL, DNS_RBTFIND_EMPTYDATA, NULL,
+ NULL);
+ if (result != ISC_R_SUCCESS) {
+ isc_log_write(dns_lctx, DNS_LOGCATEGORY_DATABASE,
+ DNS_LOGMODULE_CACHE, ISC_LOG_WARNING,
+ "delete_node: "
+ "dns_rbt_findnode(nsec): %s",
+ isc_result_totext(result));
+ } else {
+ result = dns_rbt_deletenode(rbtdb->nsec, nsecnode,
+ false);
+ if (result != ISC_R_SUCCESS) {
+ isc_log_write(
+ dns_lctx, DNS_LOGCATEGORY_DATABASE,
+ DNS_LOGMODULE_CACHE, ISC_LOG_WARNING,
+ "delete_node(): "
+ "dns_rbt_deletenode(nsecnode): %s",
+ isc_result_totext(result));
+ }
+ }
+ result = dns_rbt_deletenode(rbtdb->tree, node, false);
+ break;
+ case DNS_RBT_NSEC_NSEC:
+ result = dns_rbt_deletenode(rbtdb->nsec, node, false);
+ break;
+ case DNS_RBT_NSEC_NSEC3:
+ result = dns_rbt_deletenode(rbtdb->nsec3, node, false);
+ break;
+ }
+ if (result != ISC_R_SUCCESS) {
+ isc_log_write(dns_lctx, DNS_LOGCATEGORY_DATABASE,
+ DNS_LOGMODULE_CACHE, ISC_LOG_WARNING,
+ "delete_node(): "
+ "dns_rbt_deletenode: %s",
+ isc_result_totext(result));
+ }
+}
+
+/*
+ * Caller must be holding the node lock.
+ */
+static void
+new_reference(dns_rbtdb_t *rbtdb, dns_rbtnode_t *node,
+ isc_rwlocktype_t locktype) {
+ if (locktype == isc_rwlocktype_write && ISC_LINK_LINKED(node, deadlink))
+ {
+ ISC_LIST_UNLINK(rbtdb->deadnodes[node->locknum], node,
+ deadlink);
+ }
+ if (isc_refcount_increment0(&node->references) == 0) {
+ /* this is the first reference to the node */
+ isc_refcount_increment0(
+ &rbtdb->node_locks[node->locknum].references);
+ }
+}
+
+/*%
+ * The tree lock must be held for the result to be valid.
+ */
+static bool
+is_leaf(dns_rbtnode_t *node) {
+ return (node->parent != NULL && node->parent->down == node &&
+ node->left == NULL && node->right == NULL);
+}
+
+static void
+send_to_prune_tree(dns_rbtdb_t *rbtdb, dns_rbtnode_t *node,
+ isc_rwlocktype_t locktype) {
+ isc_event_t *ev;
+ dns_db_t *db;
+
+ ev = isc_event_allocate(rbtdb->common.mctx, NULL, DNS_EVENT_RBTPRUNE,
+ prune_tree, node, sizeof(isc_event_t));
+ new_reference(rbtdb, node, locktype);
+ db = NULL;
+ attach((dns_db_t *)rbtdb, &db);
+ ev->ev_sender = db;
+ isc_task_send(rbtdb->task, &ev);
+}
+
+/*%
+ * Clean up dead nodes. These are nodes which have no references, and
+ * have no data. They are dead but we could not or chose not to delete
+ * them when we deleted all the data at that node because we did not want
+ * to wait for the tree write lock.
+ *
+ * The caller must hold a tree write lock and bucketnum'th node (write) lock.
+ */
+static void
+cleanup_dead_nodes(dns_rbtdb_t *rbtdb, int bucketnum) {
+ dns_rbtnode_t *node;
+ int count = 10; /* XXXJT: should be adjustable */
+
+ node = ISC_LIST_HEAD(rbtdb->deadnodes[bucketnum]);
+ while (node != NULL && count > 0) {
+ ISC_LIST_UNLINK(rbtdb->deadnodes[bucketnum], node, deadlink);
+
+ /*
+ * We might have reactivated this node without a tree write
+ * lock, so we couldn't remove this node from deadnodes then
+ * and we have to do it now.
+ */
+ if (isc_refcount_current(&node->references) != 0 ||
+ node->data != NULL)
+ {
+ node = ISC_LIST_HEAD(rbtdb->deadnodes[bucketnum]);
+ count--;
+ continue;
+ }
+
+ if (is_leaf(node) && rbtdb->task != NULL) {
+ send_to_prune_tree(rbtdb, node, isc_rwlocktype_write);
+ } else if (node->down == NULL && node->data == NULL) {
+ /*
+ * Not a interior node and not needing to be
+ * reactivated.
+ */
+ delete_node(rbtdb, node);
+ } else if (node->data == NULL) {
+ /*
+ * A interior node without data. Leave linked to
+ * to be cleaned up when node->down becomes NULL.
+ */
+ ISC_LIST_APPEND(rbtdb->deadnodes[bucketnum], node,
+ deadlink);
+ }
+ node = ISC_LIST_HEAD(rbtdb->deadnodes[bucketnum]);
+ count--;
+ }
+}
+
+/*
+ * This function is assumed to be called when a node is newly referenced
+ * and can be in the deadnode list. In that case the node must be retrieved
+ * from the list because it is going to be used. In addition, if the caller
+ * happens to hold a write lock on the tree, it's a good chance to purge dead
+ * nodes.
+ * Note: while a new reference is gained in multiple places, there are only very
+ * few cases where the node can be in the deadnode list (only empty nodes can
+ * have been added to the list).
+ */
+static void
+reactivate_node(dns_rbtdb_t *rbtdb, dns_rbtnode_t *node,
+ isc_rwlocktype_t treelocktype) {
+ isc_rwlocktype_t locktype = isc_rwlocktype_read;
+ nodelock_t *nodelock = &rbtdb->node_locks[node->locknum].lock;
+ bool maybe_cleanup = false;
+
+ POST(locktype);
+
+ NODE_LOCK(nodelock, locktype);
+
+ /*
+ * Check if we can possibly cleanup the dead node. If so, upgrade
+ * the node lock below to perform the cleanup.
+ */
+ if (!ISC_LIST_EMPTY(rbtdb->deadnodes[node->locknum]) &&
+ treelocktype == isc_rwlocktype_write)
+ {
+ maybe_cleanup = true;
+ }
+
+ if (ISC_LINK_LINKED(node, deadlink) || maybe_cleanup) {
+ /*
+ * Upgrade the lock and test if we still need to unlink.
+ */
+ NODE_UNLOCK(nodelock, locktype);
+ locktype = isc_rwlocktype_write;
+ POST(locktype);
+ NODE_LOCK(nodelock, locktype);
+ if (ISC_LINK_LINKED(node, deadlink)) {
+ ISC_LIST_UNLINK(rbtdb->deadnodes[node->locknum], node,
+ deadlink);
+ }
+ if (maybe_cleanup) {
+ cleanup_dead_nodes(rbtdb, node->locknum);
+ }
+ }
+
+ new_reference(rbtdb, node, locktype);
+
+ NODE_UNLOCK(nodelock, locktype);
+}
+
+/*
+ * Caller must be holding the node lock; either the "strong", read or write
+ * lock. Note that the lock must be held even when node references are
+ * atomically modified; in that case the decrement operation itself does not
+ * have to be protected, but we must avoid a race condition where multiple
+ * threads are decreasing the reference to zero simultaneously and at least
+ * one of them is going to free the node.
+ *
+ * This function returns true if and only if the node reference decreases
+ * to zero.
+ *
+ * NOTE: Decrementing the reference count of a node to zero does not mean it
+ * will be immediately freed.
+ */
+static bool
+decrement_reference(dns_rbtdb_t *rbtdb, dns_rbtnode_t *node,
+ rbtdb_serial_t least_serial, isc_rwlocktype_t nlock,
+ isc_rwlocktype_t tlock, bool pruning) {
+ isc_result_t result;
+ bool write_locked;
+ bool locked = tlock != isc_rwlocktype_none;
+ rbtdb_nodelock_t *nodelock;
+ int bucket = node->locknum;
+ bool no_reference = true;
+ uint_fast32_t refs;
+
+ nodelock = &rbtdb->node_locks[bucket];
+
+#define KEEP_NODE(n, r, l) \
+ ((n)->data != NULL || ((l) && (n)->down != NULL) || \
+ (n) == (r)->origin_node || (n) == (r)->nsec3_origin_node)
+
+ /* Handle easy and typical case first. */
+ if (!node->dirty && KEEP_NODE(node, rbtdb, locked)) {
+ if (isc_refcount_decrement(&node->references) == 1) {
+ refs = isc_refcount_decrement(&nodelock->references);
+ INSIST(refs > 0);
+ return (true);
+ } else {
+ return (false);
+ }
+ }
+
+ /* Upgrade the lock? */
+ if (nlock == isc_rwlocktype_read) {
+ NODE_UNLOCK(&nodelock->lock, isc_rwlocktype_read);
+ NODE_LOCK(&nodelock->lock, isc_rwlocktype_write);
+ }
+
+ if (isc_refcount_decrement(&node->references) > 1) {
+ /* Restore the lock? */
+ if (nlock == isc_rwlocktype_read) {
+ NODE_DOWNGRADE(&nodelock->lock);
+ }
+ return (false);
+ }
+
+ 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.
+ */
+ RBTDB_LOCK(&rbtdb->lock, isc_rwlocktype_read);
+ least_serial = rbtdb->least_serial;
+ RBTDB_UNLOCK(&rbtdb->lock, isc_rwlocktype_read);
+ }
+ clean_zone_node(rbtdb, node, least_serial);
+ }
+ }
+
+ /*
+ * Attempt to switch to a write lock on the tree. If this fails,
+ * we will add this node to a linked list of nodes in this locking
+ * bucket which we will free later.
+ */
+ if (tlock != 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 (tlock == 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 = (result == ISC_R_SUCCESS);
+ } else {
+ write_locked = true;
+ }
+
+ refs = isc_refcount_decrement(&nodelock->references);
+ INSIST(refs > 0);
+
+ if (KEEP_NODE(node, rbtdb, locked || write_locked)) {
+ goto restore_locks;
+ }
+
+#undef KEEP_NODE
+
+ if (write_locked) {
+ /*
+ * We can now delete the node.
+ */
+
+ /*
+ * If this node is the only one in the level it's in, deleting
+ * this node may recursively make its parent the only node in
+ * the parent level; if so, and if no one is currently using
+ * the parent node, this is almost the only opportunity to
+ * clean it up. But the recursive cleanup is not that trivial
+ * since the child and parent may be in different lock buckets,
+ * which would cause a lock order reversal problem. To avoid
+ * the trouble, we'll dispatch a separate event for batch
+ * cleaning. We need to check whether we're deleting the node
+ * as a result of pruning to avoid infinite dispatching.
+ * Note: pruning happens only when a task has been set for the
+ * rbtdb. If the user of the rbtdb chooses not to set a task,
+ * it's their responsibility to purge stale leaves (e.g. by
+ * periodic walk-through).
+ */
+ if (!pruning && is_leaf(node) && rbtdb->task != NULL) {
+ send_to_prune_tree(rbtdb, node, isc_rwlocktype_write);
+ no_reference = false;
+ } else {
+ delete_node(rbtdb, node);
+ }
+ } else {
+ INSIST(node->data == NULL);
+ if (!ISC_LINK_LINKED(node, deadlink)) {
+ ISC_LIST_APPEND(rbtdb->deadnodes[bucket], node,
+ deadlink);
+ }
+ }
+
+restore_locks:
+ /* Restore the lock? */
+ if (nlock == isc_rwlocktype_read) {
+ NODE_DOWNGRADE(&nodelock->lock);
+ }
+
+ /*
+ * Relock a read lock, or unlock the write lock if no lock was held.
+ */
+ if (tlock == isc_rwlocktype_none) {
+ if (write_locked) {
+ RWUNLOCK(&rbtdb->tree_lock, isc_rwlocktype_write);
+ }
+ }
+
+ if (tlock == isc_rwlocktype_read) {
+ if (write_locked) {
+ isc_rwlock_downgrade(&rbtdb->tree_lock);
+ }
+ }
+
+ return (no_reference);
+}
+
+/*
+ * Prune the tree by recursively cleaning-up single leaves. In the worst
+ * case, the number of iteration is the number of tree levels, which is at
+ * most the maximum number of domain name labels, i.e, 127. In practice, this
+ * should be much smaller (only a few times), and even the worst case would be
+ * acceptable for a single event.
+ */
+static void
+prune_tree(isc_task_t *task, isc_event_t *event) {
+ dns_rbtdb_t *rbtdb = event->ev_sender;
+ dns_rbtnode_t *node = event->ev_arg;
+ dns_rbtnode_t *parent;
+ unsigned int locknum;
+
+ UNUSED(task);
+
+ isc_event_free(&event);
+
+ RWLOCK(&rbtdb->tree_lock, isc_rwlocktype_write);
+ locknum = node->locknum;
+ NODE_LOCK(&rbtdb->node_locks[locknum].lock, isc_rwlocktype_write);
+ do {
+ parent = node->parent;
+ decrement_reference(rbtdb, node, 0, isc_rwlocktype_write,
+ isc_rwlocktype_write, true);
+
+ if (parent != NULL && parent->down == NULL) {
+ /*
+ * node was the only down child of the parent and has
+ * just been removed. We'll then need to examine the
+ * parent. Keep the lock if possible; otherwise,
+ * release the old lock and acquire one for the parent.
+ */
+ if (parent->locknum != locknum) {
+ NODE_UNLOCK(&rbtdb->node_locks[locknum].lock,
+ isc_rwlocktype_write);
+ locknum = parent->locknum;
+ NODE_LOCK(&rbtdb->node_locks[locknum].lock,
+ isc_rwlocktype_write);
+ }
+
+ /*
+ * We need to gain a reference to the node before
+ * decrementing it in the next iteration.
+ */
+ if (ISC_LINK_LINKED(parent, deadlink)) {
+ ISC_LIST_UNLINK(rbtdb->deadnodes[locknum],
+ parent, deadlink);
+ }
+ new_reference(rbtdb, parent, isc_rwlocktype_write);
+ } else {
+ parent = NULL;
+ }
+
+ node = parent;
+ } while (node != NULL);
+ NODE_UNLOCK(&rbtdb->node_locks[locknum].lock, isc_rwlocktype_write);
+ RWUNLOCK(&rbtdb->tree_lock, isc_rwlocktype_write);
+
+ detach((dns_db_t **)&rbtdb);
+}
+
+static 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 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
+iszonesecure(dns_db_t *db, rbtdb_version_t *version, dns_dbnode_t *origin) {
+ dns_rdataset_t keyset;
+ dns_rdataset_t nsecset, signsecset;
+ bool haszonekey = false;
+ bool hasnsec = false;
+ isc_result_t result;
+
+ dns_rdataset_init(&keyset);
+ result = dns_db_findrdataset(db, origin, version, dns_rdatatype_dnskey,
+ 0, 0, &keyset, NULL);
+ if (result == ISC_R_SUCCESS) {
+ result = dns_rdataset_first(&keyset);
+ while (result == ISC_R_SUCCESS) {
+ dns_rdata_t keyrdata = DNS_RDATA_INIT;
+ dns_rdataset_current(&keyset, &keyrdata);
+ if (dns_zonekey_iszonekey(&keyrdata)) {
+ haszonekey = true;
+ break;
+ }
+ result = dns_rdataset_next(&keyset);
+ }
+ dns_rdataset_disassociate(&keyset);
+ }
+ if (!haszonekey) {
+ version->secure = dns_db_insecure;
+ version->havensec3 = false;
+ return;
+ }
+
+ dns_rdataset_init(&nsecset);
+ dns_rdataset_init(&signsecset);
+ result = dns_db_findrdataset(db, origin, version, dns_rdatatype_nsec, 0,
+ 0, &nsecset, &signsecset);
+ if (result == ISC_R_SUCCESS) {
+ if (dns_rdataset_isassociated(&signsecset)) {
+ hasnsec = true;
+ dns_rdataset_disassociate(&signsecset);
+ }
+ dns_rdataset_disassociate(&nsecset);
+ }
+
+ setnsec3parameters(db, version);
+
+ /*
+ * Do we have a valid NSEC/NSEC3 chain?
+ */
+ if (version->havensec3 || hasnsec) {
+ version->secure = dns_db_secure;
+ } else {
+ version->secure = dns_db_insecure;
+ }
+}
+
+/*%<
+ * Walk the origin node looking for NSEC3PARAM records.
+ * Cache the nsec3 parameters.
+ */
+static void
+setnsec3parameters(dns_db_t *db, rbtdb_version_t *version) {
+ dns_rbtnode_t *node;
+ dns_rdata_nsec3param_t nsec3param;
+ dns_rdata_t rdata = DNS_RDATA_INIT;
+ isc_region_t region;
+ isc_result_t result;
+ rdatasetheader_t *header, *header_next;
+ unsigned char *raw; /* RDATASLAB */
+ unsigned int count, length;
+ dns_rbtdb_t *rbtdb = (dns_rbtdb_t *)db;
+
+ RWLOCK(&rbtdb->tree_lock, isc_rwlocktype_read);
+ version->havensec3 = false;
+ node = rbtdb->origin_node;
+ NODE_LOCK(&(rbtdb->node_locks[node->locknum].lock),
+ isc_rwlocktype_read);
+ for (header = node->data; header != NULL; header = header_next) {
+ header_next = header->next;
+ do {
+ if (header->serial <= version->serial &&
+ !IGNORE(header))
+ {
+ if (NONEXISTENT(header)) {
+ header = NULL;
+ }
+ break;
+ } else {
+ header = header->down;
+ }
+ } while (header != NULL);
+
+ if (header != NULL &&
+ (header->type == dns_rdatatype_nsec3param))
+ {
+ /*
+ * Find A NSEC3PARAM with a supported algorithm.
+ */
+ raw = (unsigned char *)header + sizeof(*header);
+ count = raw[0] * 256 + raw[1]; /* count */
+ raw += DNS_RDATASET_COUNT + DNS_RDATASET_LENGTH;
+ while (count-- > 0U) {
+ length = raw[0] * 256 + raw[1];
+ raw += DNS_RDATASET_ORDER + DNS_RDATASET_LENGTH;
+ region.base = raw;
+ region.length = length;
+ raw += length;
+ dns_rdata_fromregion(
+ &rdata, rbtdb->common.rdclass,
+ dns_rdatatype_nsec3param, &region);
+ result = dns_rdata_tostruct(&rdata, &nsec3param,
+ NULL);
+ INSIST(result == ISC_R_SUCCESS);
+ dns_rdata_reset(&rdata);
+
+ if (nsec3param.hash != DNS_NSEC3_UNKNOWNALG &&
+ !dns_nsec3_supportedhash(nsec3param.hash))
+ {
+ continue;
+ }
+
+ if (nsec3param.flags != 0) {
+ continue;
+ }
+
+ memmove(version->salt, nsec3param.salt,
+ nsec3param.salt_length);
+ version->hash = nsec3param.hash;
+ version->salt_length = nsec3param.salt_length;
+ version->iterations = nsec3param.iterations;
+ version->flags = nsec3param.flags;
+ version->havensec3 = true;
+ /*
+ * Look for a better algorithm than the
+ * unknown test algorithm.
+ */
+ if (nsec3param.hash != DNS_NSEC3_UNKNOWNALG) {
+ goto unlock;
+ }
+ }
+ }
+ }
+unlock:
+ NODE_UNLOCK(&(rbtdb->node_locks[node->locknum].lock),
+ isc_rwlocktype_read);
+ RWUNLOCK(&rbtdb->tree_lock, isc_rwlocktype_read);
+}
+
+static void
+cleanup_dead_nodes_callback(isc_task_t *task, isc_event_t *event) {
+ dns_rbtdb_t *rbtdb = event->ev_arg;
+ bool again = false;
+ unsigned int locknum;
+
+ RWLOCK(&rbtdb->tree_lock, isc_rwlocktype_write);
+ for (locknum = 0; locknum < rbtdb->node_lock_count; locknum++) {
+ NODE_LOCK(&rbtdb->node_locks[locknum].lock,
+ isc_rwlocktype_write);
+ cleanup_dead_nodes(rbtdb, locknum);
+ if (ISC_LIST_HEAD(rbtdb->deadnodes[locknum]) != NULL) {
+ again = true;
+ }
+ NODE_UNLOCK(&rbtdb->node_locks[locknum].lock,
+ isc_rwlocktype_write);
+ }
+ RWUNLOCK(&rbtdb->tree_lock, isc_rwlocktype_write);
+ if (again) {
+ isc_task_send(task, &event);
+ } else {
+ isc_event_free(&event);
+ if (isc_refcount_decrement(&rbtdb->references) == 1) {
+ (void)isc_refcount_current(&rbtdb->references);
+ maybe_free_rbtdb(rbtdb);
+ }
+ }
+}
+
+static void
+closeversion(dns_db_t *db, dns_dbversion_t **versionp, bool commit) {
+ dns_rbtdb_t *rbtdb = (dns_rbtdb_t *)db;
+ rbtdb_version_t *version, *cleanup_version, *least_greater;
+ bool rollback = false;
+ rbtdb_changedlist_t cleanup_list;
+ rdatasetheaderlist_t resigned_list;
+ rbtdb_changed_t *changed, *next_changed;
+ rbtdb_serial_t serial, least_serial;
+ dns_rbtnode_t *rbtnode;
+ rdatasetheader_t *header;
+
+ REQUIRE(VALID_RBTDB(rbtdb));
+ version = (rbtdb_version_t *)*versionp;
+ INSIST(version->rbtdb == rbtdb);
+
+ cleanup_version = NULL;
+ ISC_LIST_INIT(cleanup_list);
+ ISC_LIST_INIT(resigned_list);
+
+ if (isc_refcount_decrement(&version->references) > 1) {
+ /* typical and easy case first */
+ if (commit) {
+ RBTDB_LOCK(&rbtdb->lock, isc_rwlocktype_read);
+ INSIST(!version->writer);
+ RBTDB_UNLOCK(&rbtdb->lock, isc_rwlocktype_read);
+ }
+ goto end;
+ }
+
+ /*
+ * Update the zone's secure status in version before making
+ * it the current version.
+ */
+ if (version->writer && commit && !IS_CACHE(rbtdb)) {
+ iszonesecure(db, version, rbtdb->origin_node);
+ }
+
+ RBTDB_LOCK(&rbtdb->lock, isc_rwlocktype_write);
+ serial = version->serial;
+ if (version->writer) {
+ if (commit) {
+ unsigned cur_ref;
+ rbtdb_version_t *cur_version;
+
+ INSIST(version->commit_ok);
+ INSIST(version == rbtdb->future_version);
+ /*
+ * The current version is going to be replaced.
+ * Release the (likely last) reference to it from the
+ * DB itself and unlink it from the open list.
+ */
+ cur_version = rbtdb->current_version;
+ cur_ref = isc_refcount_decrement(
+ &cur_version->references);
+ if (cur_ref == 1) {
+ (void)isc_refcount_current(
+ &cur_version->references);
+ if (cur_version->serial == rbtdb->least_serial)
+ {
+ INSIST(EMPTY(
+ cur_version->changed_list));
+ }
+ UNLINK(rbtdb->open_versions, cur_version, link);
+ }
+ 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 (cur_ref == 1) {
+ cleanup_version = cur_version;
+ APPENDLIST(version->changed_list,
+ cleanup_version->changed_list, link);
+ }
+ /*
+ * Become the current version.
+ */
+ version->writer = false;
+ rbtdb->current_version = version;
+ rbtdb->current_serial = version->serial;
+ rbtdb->future_version = NULL;
+
+ /*
+ * Keep the current version in the open list, and
+ * gain a reference for the DB itself (see the DB
+ * creation function below). This must be the only
+ * case where we need to increment the counter from
+ * zero and need to use isc_refcount_increment0().
+ */
+ INSIST(isc_refcount_increment0(&version->references) ==
+ 0);
+ PREPEND(rbtdb->open_versions, rbtdb->current_version,
+ link);
+ resigned_list = version->resigned_list;
+ ISC_LIST_INIT(version->resigned_list);
+ } else {
+ /*
+ * We're rolling back this transaction.
+ */
+ cleanup_list = version->changed_list;
+ ISC_LIST_INIT(version->changed_list);
+ resigned_list = version->resigned_list;
+ ISC_LIST_INIT(version->resigned_list);
+ rollback = 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;
+ RBTDB_UNLOCK(&rbtdb->lock, isc_rwlocktype_write);
+
+ if (cleanup_version != NULL) {
+ INSIST(EMPTY(cleanup_version->changed_list));
+ free_gluetable(cleanup_version);
+ isc_rwlock_destroy(&cleanup_version->glue_rwlock);
+ isc_rwlock_destroy(&cleanup_version->rwlock);
+ isc_mem_put(rbtdb->common.mctx, cleanup_version,
+ sizeof(*cleanup_version));
+ }
+
+ /*
+ * Commit/rollback re-signed headers.
+ */
+ for (header = HEAD(resigned_list); header != NULL;
+ header = HEAD(resigned_list))
+ {
+ nodelock_t *lock;
+
+ ISC_LIST_UNLINK(resigned_list, header, link);
+
+ lock = &rbtdb->node_locks[header->node->locknum].lock;
+ NODE_LOCK(lock, isc_rwlocktype_write);
+ if (rollback && !IGNORE(header)) {
+ resign_insert(rbtdb, header->node->locknum, header);
+ }
+ decrement_reference(rbtdb, header->node, least_serial,
+ isc_rwlocktype_write, isc_rwlocktype_none,
+ false);
+ NODE_UNLOCK(lock, isc_rwlocktype_write);
+ }
+
+ if (!EMPTY(cleanup_list)) {
+ isc_event_t *event = NULL;
+ isc_rwlocktype_t tlock = isc_rwlocktype_none;
+
+ if (rbtdb->task != NULL) {
+ event = isc_event_allocate(rbtdb->common.mctx, NULL,
+ DNS_EVENT_RBTDEADNODES,
+ cleanup_dead_nodes_callback,
+ rbtdb, sizeof(isc_event_t));
+ }
+ if (event == NULL) {
+ /*
+ * We acquire a tree write lock here in order to make
+ * sure that stale nodes will be removed in
+ * decrement_reference(). If we didn't have the lock,
+ * those nodes could miss the chance to be removed
+ * until the server stops. The write lock is
+ * expensive, but this event should be rare enough
+ * to justify the cost.
+ */
+ RWLOCK(&rbtdb->tree_lock, isc_rwlocktype_write);
+ tlock = isc_rwlocktype_write;
+ }
+
+ for (changed = HEAD(cleanup_list); changed != NULL;
+ changed = next_changed)
+ {
+ nodelock_t *lock;
+
+ next_changed = NEXT(changed, link);
+ rbtnode = changed->node;
+ lock = &rbtdb->node_locks[rbtnode->locknum].lock;
+
+ NODE_LOCK(lock, isc_rwlocktype_write);
+ /*
+ * This is a good opportunity to purge any dead nodes,
+ * so use it.
+ */
+ if (event == NULL) {
+ cleanup_dead_nodes(rbtdb, rbtnode->locknum);
+ }
+
+ if (rollback) {
+ rollback_node(rbtnode, serial);
+ }
+ decrement_reference(rbtdb, rbtnode, least_serial,
+ isc_rwlocktype_write, tlock, false);
+
+ NODE_UNLOCK(lock, isc_rwlocktype_write);
+
+ isc_mem_put(rbtdb->common.mctx, changed,
+ sizeof(*changed));
+ }
+ if (event != NULL) {
+ isc_refcount_increment(&rbtdb->references);
+ isc_task_send(rbtdb->task, &event);
+ } else {
+ RWUNLOCK(&rbtdb->tree_lock, isc_rwlocktype_write);
+ }
+ }
+
+end:
+ *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.
+ *
+ * tree_lock(write) must be held.
+ */
+static isc_result_t
+add_wildcard_magic(dns_rbtdb_t *rbtdb, const dns_name_t *name, bool lock) {
+ 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);
+ }
+ if (result == ISC_R_SUCCESS) {
+ node->nsec = DNS_RBT_NSEC_NORMAL;
+ }
+ node->find_callback = 1;
+ if (lock) {
+ NODE_LOCK(&rbtdb->node_locks[node->locknum].lock,
+ isc_rwlocktype_write);
+ }
+ node->wild = 1;
+ if (lock) {
+ NODE_UNLOCK(&rbtdb->node_locks[node->locknum].lock,
+ isc_rwlocktype_write);
+ }
+ return (ISC_R_SUCCESS);
+}
+
+/*
+ * tree_lock(write) must be held.
+ */
+static isc_result_t
+add_empty_wildcards(dns_rbtdb_t *rbtdb, const dns_name_t *name, bool lock) {
+ 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, lock);
+ 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);
+ }
+ if (result == ISC_R_SUCCESS) {
+ node->nsec = DNS_RBT_NSEC_NORMAL;
+ }
+ }
+ i++;
+ }
+ return (ISC_R_SUCCESS);
+}
+
+static isc_result_t
+findnodeintree(dns_rbtdb_t *rbtdb, dns_rbt_t *tree, const dns_name_t *name,
+ bool create, dns_dbnode_t **nodep) {
+ dns_rbtnode_t *node = NULL;
+ dns_name_t nodename;
+ isc_result_t result;
+ isc_rwlocktype_t locktype = isc_rwlocktype_read;
+
+ INSIST(tree == rbtdb->tree || tree == rbtdb->nsec3);
+
+ dns_name_init(&nodename, NULL);
+ RWLOCK(&rbtdb->tree_lock, locktype);
+ result = dns_rbt_findnode(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(tree, name, &node);
+ if (result == ISC_R_SUCCESS) {
+ dns_rbt_namefromnode(node, &nodename);
+ node->locknum = node->hashval % rbtdb->node_lock_count;
+ if (tree == rbtdb->tree) {
+ add_empty_wildcards(rbtdb, name, true);
+
+ if (dns_name_iswildcard(name)) {
+ result = add_wildcard_magic(rbtdb, name,
+ true);
+ if (result != ISC_R_SUCCESS) {
+ RWUNLOCK(&rbtdb->tree_lock,
+ locktype);
+ return (result);
+ }
+ }
+ }
+ if (tree == rbtdb->nsec3) {
+ node->nsec = DNS_RBT_NSEC_NSEC3;
+ }
+ } else if (result != ISC_R_EXISTS) {
+ RWUNLOCK(&rbtdb->tree_lock, locktype);
+ return (result);
+ }
+ }
+
+ if (tree == rbtdb->nsec3) {
+ INSIST(node->nsec == DNS_RBT_NSEC_NSEC3);
+ }
+
+ reactivate_node(rbtdb, node, locktype);
+
+ RWUNLOCK(&rbtdb->tree_lock, locktype);
+
+ *nodep = (dns_dbnode_t *)node;
+
+ return (ISC_R_SUCCESS);
+}
+
+static isc_result_t
+findnode(dns_db_t *db, const dns_name_t *name, bool create,
+ dns_dbnode_t **nodep) {
+ dns_rbtdb_t *rbtdb = (dns_rbtdb_t *)db;
+
+ REQUIRE(VALID_RBTDB(rbtdb));
+
+ return (findnodeintree(rbtdb, rbtdb->tree, name, create, nodep));
+}
+
+static isc_result_t
+findnsec3node(dns_db_t *db, const dns_name_t *name, bool create,
+ dns_dbnode_t **nodep) {
+ dns_rbtdb_t *rbtdb = (dns_rbtdb_t *)db;
+
+ REQUIRE(VALID_RBTDB(rbtdb));
+
+ return (findnodeintree(rbtdb, rbtdb->nsec3, name, create, nodep));
+}
+
+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;
+
+ NODE_LOCK(&(search->rbtdb->node_locks[node->locknum].lock),
+ isc_rwlocktype_read);
+
+ /*
+ * 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 (!IS_CACHE(search->rbtdb) && !IS_STUB(search->rbtdb) &&
+ ns_header != NULL)
+ {
+ /*
+ * Note that NS has precedence over DNAME if both exist
+ * in a zone. Otherwise DNAME take precedence over NS.
+ */
+ found = ns_header;
+ search->zonecut_sigrdataset = NULL;
+ } else if (dname_header != NULL) {
+ 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, isc_rwlocktype_read);
+ search->zonecut = node;
+ search->zonecut_rdataset = found;
+ search->need_cleanup = 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 = 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);
+ dns_name_copynf(name, zcname);
+ search->copy_name = 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 = true;
+ }
+ }
+
+ NODE_UNLOCK(&(search->rbtdb->node_locks[node->locknum].lock),
+ isc_rwlocktype_read);
+
+ return (result);
+}
+
+static void
+bind_rdataset(dns_rbtdb_t *rbtdb, dns_rbtnode_t *node, rdatasetheader_t *header,
+ isc_stdtime_t now, isc_rwlocktype_t locktype,
+ dns_rdataset_t *rdataset) {
+ unsigned char *raw; /* RDATASLAB */
+ bool stale = STALE(header);
+ bool ancient = ANCIENT(header);
+
+ /*
+ * Caller must be holding the node reader lock.
+ * XXXJT: technically, we need a writer lock, since we'll increment
+ * the header count below. However, since the actual counter value
+ * doesn't matter, we prioritize performance here. (We may want to
+ * use atomic increment when available).
+ */
+
+ if (rdataset == NULL) {
+ return;
+ }
+
+ new_reference(rbtdb, node, locktype);
+
+ INSIST(rdataset->methods == NULL); /* We must be disassociated. */
+
+ /*
+ * Mark header stale or ancient if the RRset is no longer active.
+ */
+ if (!ACTIVE(header, now)) {
+ dns_ttl_t stale_ttl = header->rdh_ttl + rbtdb->serve_stale_ttl;
+ /*
+ * If this data is in the stale window keep it and if
+ * DNS_DBFIND_STALEOK is not set we tell the caller to
+ * skip this record. We skip the records with ZEROTTL
+ * (these records should not be cached anyway).
+ */
+
+ if (KEEPSTALE(rbtdb) && stale_ttl > now) {
+ stale = true;
+ } else {
+ /*
+ * We are not keeping stale, or it is outside the
+ * stale window. Mark ancient, i.e. ready for cleanup.
+ */
+ ancient = true;
+ }
+ }
+
+ 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->rdh_ttl - now;
+ rdataset->trust = header->trust;
+
+ if (NEGATIVE(header)) {
+ rdataset->attributes |= DNS_RDATASETATTR_NEGATIVE;
+ }
+ if (NXDOMAIN(header)) {
+ rdataset->attributes |= DNS_RDATASETATTR_NXDOMAIN;
+ }
+ if (OPTOUT(header)) {
+ rdataset->attributes |= DNS_RDATASETATTR_OPTOUT;
+ }
+ if (PREFETCH(header)) {
+ rdataset->attributes |= DNS_RDATASETATTR_PREFETCH;
+ }
+
+ if (stale && !ancient) {
+ dns_ttl_t stale_ttl = header->rdh_ttl + rbtdb->serve_stale_ttl;
+ if (stale_ttl > now) {
+ rdataset->ttl = stale_ttl - now;
+ } else {
+ rdataset->ttl = 0;
+ }
+ if (STALE_WINDOW(header)) {
+ rdataset->attributes |= DNS_RDATASETATTR_STALE_WINDOW;
+ }
+ rdataset->attributes |= DNS_RDATASETATTR_STALE;
+ } else if (IS_CACHE(rbtdb) && !ACTIVE(header, now)) {
+ rdataset->attributes |= DNS_RDATASETATTR_ANCIENT;
+ rdataset->ttl = header->rdh_ttl;
+ }
+
+ rdataset->private1 = rbtdb;
+ rdataset->private2 = node;
+ raw = (unsigned char *)header + sizeof(*header);
+ rdataset->private3 = raw;
+ rdataset->count = atomic_fetch_add_relaxed(&header->count, 1);
+ if (rdataset->count == UINT32_MAX) {
+ rdataset->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;
+ }
+ rdataset->private7 = header->closest;
+ if (rdataset->private7 != NULL) {
+ rdataset->attributes |= DNS_RDATASETATTR_CLOSEST;
+ }
+
+ /*
+ * Copy out re-signing information.
+ */
+ if (RESIGN(header)) {
+ rdataset->attributes |= DNS_RDATASETATTR_RESIGN;
+ rdataset->resign = (header->resign << 1) | header->resign_lsb;
+ } else {
+ rdataset->resign = 0;
+ }
+}
+
+static 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) {
+ 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);
+ dns_name_copynf(zcname, foundname);
+ }
+ 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 = false;
+ }
+ if (rdataset != NULL) {
+ NODE_LOCK(&(search->rbtdb->node_locks[node->locknum].lock),
+ isc_rwlocktype_read);
+ bind_rdataset(search->rbtdb, node, search->zonecut_rdataset,
+ search->now, isc_rwlocktype_read, rdataset);
+ if (sigrdataset != NULL && search->zonecut_sigrdataset != NULL)
+ {
+ bind_rdataset(search->rbtdb, node,
+ search->zonecut_sigrdataset, search->now,
+ isc_rwlocktype_read, sigrdataset);
+ }
+ NODE_UNLOCK(&(search->rbtdb->node_locks[node->locknum].lock),
+ isc_rwlocktype_read);
+ }
+
+ if (type == dns_rdatatype_dname) {
+ return (DNS_R_DNAME);
+ }
+ return (DNS_R_DELEGATION);
+}
+
+static bool
+valid_glue(rbtdb_search_t *search, dns_name_t *name, rbtdb_rdatatype_t type,
+ dns_rbtnode_t *node) {
+ unsigned char *raw; /* RDATASLAB */
+ unsigned int count, size;
+ dns_name_t ns_name;
+ bool valid = 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 (false);
+ }
+ } else if (type != dns_rdatatype_a && type != dns_rdatatype_aaaa &&
+ type != dns_rdatatype_a6)
+ {
+ return (false);
+ }
+
+ header = search->zonecut_rdataset;
+ raw = (unsigned char *)header + sizeof(*header);
+ count = raw[0] * 256 + raw[1];
+ raw += DNS_RDATASET_COUNT + DNS_RDATASET_LENGTH;
+
+ while (count > 0) {
+ count--;
+ size = raw[0] * 256 + raw[1];
+ raw += DNS_RDATASET_ORDER + DNS_RDATASET_LENGTH;
+ 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, &region);
+ if (dns_name_compare(&ns_name, name) == 0) {
+ valid = true;
+ break;
+ }
+ }
+
+ return (valid);
+}
+
+static bool
+activeempty(rbtdb_search_t *search, dns_rbtnodechain_t *chain,
+ const 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;
+ bool answer = false;
+ rdatasetheader_t *header;
+
+ rbtdb = search->rbtdb;
+
+ dns_name_init(&prefix, NULL);
+ next = dns_fixedname_initname(&fnext);
+ origin = dns_fixedname_initname(&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;
+ }
+ NODE_LOCK(&(rbtdb->node_locks[node->locknum].lock),
+ isc_rwlocktype_read);
+ for (header = node->data; header != NULL; header = header->next)
+ {
+ if (header->serial <= search->serial &&
+ !IGNORE(header) && EXISTS(header))
+ {
+ break;
+ }
+ }
+ NODE_UNLOCK(&(rbtdb->node_locks[node->locknum].lock),
+ isc_rwlocktype_read);
+ 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 = true;
+ }
+ return (answer);
+}
+
+static bool
+activeemptynode(rbtdb_search_t *search, const 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;
+ bool check_next = true;
+ bool check_prev = true;
+ bool answer = 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);
+ next = dns_fixedname_initname(&fnext);
+ prev = dns_fixedname_initname(&fprev);
+ origin = dns_fixedname_initname(&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;
+ }
+ NODE_LOCK(&(rbtdb->node_locks[node->locknum].lock),
+ isc_rwlocktype_read);
+ for (header = node->data; header != NULL; header = header->next)
+ {
+ if (header->serial <= search->serial &&
+ !IGNORE(header) && EXISTS(header))
+ {
+ break;
+ }
+ }
+ NODE_UNLOCK(&(rbtdb->node_locks[node->locknum].lock),
+ isc_rwlocktype_read);
+ 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 = 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;
+ }
+ NODE_LOCK(&(rbtdb->node_locks[node->locknum].lock),
+ isc_rwlocktype_read);
+ for (header = node->data; header != NULL; header = header->next)
+ {
+ if (header->serial <= search->serial &&
+ !IGNORE(header) && EXISTS(header))
+ {
+ break;
+ }
+ }
+ NODE_UNLOCK(&(rbtdb->node_locks[node->locknum].lock),
+ isc_rwlocktype_read);
+ 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 = 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 = 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 isc_result_t
+find_wildcard(rbtdb_search_t *search, dns_rbtnode_t **nodep,
+ const 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;
+ bool 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 = false;
+ node = *nodep;
+ do {
+ NODE_LOCK(&(rbtdb->node_locks[node->locknum].lock),
+ isc_rwlocktype_read);
+
+ /*
+ * 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) &&
+ !ANCIENT(header))
+ {
+ break;
+ }
+ }
+ if (header != NULL) {
+ active = true;
+ } else {
+ active = false;
+ }
+
+ if (node->wild) {
+ wild = true;
+ } else {
+ wild = false;
+ }
+
+ NODE_UNLOCK(&(rbtdb->node_locks[node->locknum].lock),
+ isc_rwlocktype_read);
+
+ if (wild) {
+ /*
+ * Construct the wildcard name for this level.
+ */
+ dns_name_init(&name, NULL);
+ dns_rbt_namefromnode(node, &name);
+ wname = dns_fixedname_initname(&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);
+ result = dns_rbt_findnode(
+ rbtdb->tree, wname, NULL, &wnode, &wchain,
+ DNS_RBTFIND_EMPTYDATA, NULL, NULL);
+ if (result == ISC_R_SUCCESS) {
+ nodelock_t *lock;
+
+ /*
+ * 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;
+ NODE_LOCK(lock, isc_rwlocktype_read);
+ for (header = wnode->data; header != NULL;
+ header = header->next)
+ {
+ if (header->serial <= search->serial &&
+ !IGNORE(header) && EXISTS(header) &&
+ !ANCIENT(header))
+ {
+ break;
+ }
+ }
+ NODE_UNLOCK(lock, isc_rwlocktype_read);
+ if (header != NULL ||
+ activeempty(search, &wchain, wname))
+ {
+ if (activeemptynode(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 = true;
+ }
+ } while (!done);
+
+ return (result);
+}
+
+static bool
+matchparams(rdatasetheader_t *header, rbtdb_search_t *search) {
+ dns_rdata_t rdata = DNS_RDATA_INIT;
+ dns_rdata_nsec3_t nsec3;
+ unsigned char *raw; /* RDATASLAB */
+ unsigned int rdlen, count;
+ isc_region_t region;
+ isc_result_t result;
+
+ REQUIRE(header->type == dns_rdatatype_nsec3);
+
+ raw = (unsigned char *)header + sizeof(*header);
+ count = raw[0] * 256 + raw[1]; /* count */
+ raw += DNS_RDATASET_COUNT + DNS_RDATASET_LENGTH;
+
+ while (count-- > 0) {
+ rdlen = raw[0] * 256 + raw[1];
+ raw += DNS_RDATASET_ORDER + DNS_RDATASET_LENGTH;
+ region.base = raw;
+ region.length = rdlen;
+ dns_rdata_fromregion(&rdata, search->rbtdb->common.rdclass,
+ dns_rdatatype_nsec3, &region);
+ raw += rdlen;
+ result = dns_rdata_tostruct(&rdata, &nsec3, NULL);
+ INSIST(result == ISC_R_SUCCESS);
+ if (nsec3.hash == search->rbtversion->hash &&
+ nsec3.iterations == search->rbtversion->iterations &&
+ nsec3.salt_length == search->rbtversion->salt_length &&
+ memcmp(nsec3.salt, search->rbtversion->salt,
+ nsec3.salt_length) == 0)
+ {
+ return (true);
+ }
+ dns_rdata_reset(&rdata);
+ }
+ return (false);
+}
+
+/*
+ * Find node of the NSEC/NSEC3 record that is 'name'.
+ */
+static isc_result_t
+previous_closest_nsec(dns_rdatatype_t type, rbtdb_search_t *search,
+ dns_name_t *name, dns_name_t *origin,
+ dns_rbtnode_t **nodep, dns_rbtnodechain_t *nsecchain,
+ bool *firstp) {
+ dns_fixedname_t ftarget;
+ dns_name_t *target;
+ dns_rbtnode_t *nsecnode;
+ isc_result_t result;
+
+ REQUIRE(nodep != NULL && *nodep == NULL);
+ REQUIRE(type == dns_rdatatype_nsec3 || firstp != NULL);
+
+ if (type == dns_rdatatype_nsec3) {
+ result = dns_rbtnodechain_prev(&search->chain, NULL, NULL);
+ if (result != ISC_R_SUCCESS && result != DNS_R_NEWORIGIN) {
+ return (result);
+ }
+ result = dns_rbtnodechain_current(&search->chain, name, origin,
+ nodep);
+ return (result);
+ }
+
+ target = dns_fixedname_initname(&ftarget);
+
+ for (;;) {
+ if (*firstp) {
+ /*
+ * Construct the name of the second node to check.
+ * It is the first node sought in the NSEC tree.
+ */
+ *firstp = false;
+ dns_rbtnodechain_init(nsecchain);
+ result = dns_name_concatenate(name, origin, target,
+ NULL);
+ if (result != ISC_R_SUCCESS) {
+ return (result);
+ }
+ nsecnode = NULL;
+ result = dns_rbt_findnode(
+ search->rbtdb->nsec, target, NULL, &nsecnode,
+ nsecchain, DNS_RBTFIND_EMPTYDATA, NULL, NULL);
+ if (result == ISC_R_SUCCESS) {
+ /*
+ * Since this was the first loop, finding the
+ * name in the NSEC tree implies that the first
+ * node checked in the main tree had an
+ * unacceptable NSEC record.
+ * Try the previous node in the NSEC tree.
+ */
+ result = dns_rbtnodechain_prev(nsecchain, name,
+ origin);
+ if (result == DNS_R_NEWORIGIN) {
+ result = ISC_R_SUCCESS;
+ }
+ } else if (result == ISC_R_NOTFOUND ||
+ result == DNS_R_PARTIALMATCH)
+ {
+ result = dns_rbtnodechain_current(
+ nsecchain, name, origin, NULL);
+ if (result == ISC_R_NOTFOUND) {
+ result = ISC_R_NOMORE;
+ }
+ }
+ } else {
+ /*
+ * This is a second or later trip through the auxiliary
+ * tree for the name of a third or earlier NSEC node in
+ * the main tree. Previous trips through the NSEC tree
+ * must have found nodes in the main tree with NSEC
+ * records. Perhaps they lacked signature records.
+ */
+ result = dns_rbtnodechain_prev(nsecchain, name, origin);
+ if (result == DNS_R_NEWORIGIN) {
+ result = ISC_R_SUCCESS;
+ }
+ }
+ if (result != ISC_R_SUCCESS) {
+ return (result);
+ }
+
+ /*
+ * Construct the name to seek in the main tree.
+ */
+ result = dns_name_concatenate(name, origin, target, NULL);
+ if (result != ISC_R_SUCCESS) {
+ return (result);
+ }
+
+ *nodep = NULL;
+ result = dns_rbt_findnode(search->rbtdb->tree, target, NULL,
+ nodep, &search->chain,
+ DNS_RBTFIND_EMPTYDATA, NULL, NULL);
+ if (result == ISC_R_SUCCESS) {
+ return (result);
+ }
+
+ /*
+ * There should always be a node in the main tree with the
+ * same name as the node in the auxiliary NSEC tree, except for
+ * nodes in the auxiliary tree that are awaiting deletion.
+ */
+ if (result != DNS_R_PARTIALMATCH && result != ISC_R_NOTFOUND) {
+ isc_log_write(dns_lctx, DNS_LOGCATEGORY_DATABASE,
+ DNS_LOGMODULE_CACHE, ISC_LOG_ERROR,
+ "previous_closest_nsec(): %s",
+ isc_result_totext(result));
+ return (DNS_R_BADDB);
+ }
+ }
+}
+
+/*
+ * Find the NSEC/NSEC3 which is or before the current point on the
+ * search chain. For NSEC3 records only NSEC3 records that match the
+ * current NSEC3PARAM record are considered.
+ */
+static 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, dns_rbt_t *tree,
+ dns_db_secure_t secure) {
+ dns_rbtnode_t *node, *prevnode;
+ rdatasetheader_t *header, *header_next, *found, *foundsig;
+ dns_rbtnodechain_t nsecchain;
+ bool empty_node;
+ isc_result_t result;
+ dns_fixedname_t fname, forigin;
+ dns_name_t *name, *origin;
+ dns_rdatatype_t type;
+ rbtdb_rdatatype_t sigtype;
+ bool wraps;
+ bool first = true;
+ bool need_sig = (secure == dns_db_secure);
+
+ if (tree == search->rbtdb->nsec3) {
+ type = dns_rdatatype_nsec3;
+ sigtype = RBTDB_RDATATYPE_SIGNSEC3;
+ wraps = true;
+ } else {
+ type = dns_rdatatype_nsec;
+ sigtype = RBTDB_RDATATYPE_SIGNSEC;
+ wraps = false;
+ }
+
+ /*
+ * Use the auxiliary tree only starting with the second node in the
+ * hope that the original node will be right much of the time.
+ */
+ name = dns_fixedname_initname(&fname);
+ origin = dns_fixedname_initname(&forigin);
+again:
+ node = NULL;
+ prevnode = NULL;
+ result = dns_rbtnodechain_current(&search->chain, name, origin, &node);
+ if (result != ISC_R_SUCCESS) {
+ return (result);
+ }
+ do {
+ NODE_LOCK(&(search->rbtdb->node_locks[node->locknum].lock),
+ isc_rwlocktype_read);
+ found = NULL;
+ foundsig = NULL;
+ empty_node = 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 = false;
+ if (header->type == type) {
+ found = header;
+ if (foundsig != NULL) {
+ break;
+ }
+ } else if (header->type == sigtype) {
+ foundsig = header;
+ if (found != NULL) {
+ break;
+ }
+ }
+ }
+ }
+ if (!empty_node) {
+ if (found != NULL && search->rbtversion->havensec3 &&
+ found->type == dns_rdatatype_nsec3 &&
+ !matchparams(found, search))
+ {
+ empty_node = true;
+ found = NULL;
+ foundsig = NULL;
+ result = previous_closest_nsec(
+ type, search, name, origin, &prevnode,
+ NULL, NULL);
+ } else if (found != NULL &&
+ (foundsig != NULL || !need_sig))
+ {
+ /*
+ * We've found the right NSEC/NSEC3 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,
+ isc_rwlocktype_read);
+ *nodep = node;
+ }
+ bind_rdataset(search->rbtdb, node,
+ found, search->now,
+ isc_rwlocktype_read,
+ rdataset);
+ if (foundsig != NULL) {
+ bind_rdataset(
+ search->rbtdb, node,
+ foundsig, search->now,
+ isc_rwlocktype_read,
+ 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 = true;
+ result = previous_closest_nsec(
+ type, search, name, origin, &prevnode,
+ &nsecchain, &first);
+ } 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 = previous_closest_nsec(type, search, name,
+ origin, &prevnode,
+ &nsecchain, &first);
+ }
+ NODE_UNLOCK(&(search->rbtdb->node_locks[node->locknum].lock),
+ isc_rwlocktype_read);
+ node = prevnode;
+ prevnode = NULL;
+ } while (empty_node && result == ISC_R_SUCCESS);
+
+ if (!first) {
+ dns_rbtnodechain_invalidate(&nsecchain);
+ }
+
+ if (result == ISC_R_NOMORE && wraps) {
+ result = dns_rbtnodechain_last(&search->chain, tree, NULL,
+ NULL);
+ if (result == ISC_R_SUCCESS || result == DNS_R_NEWORIGIN) {
+ wraps = false;
+ goto again;
+ }
+ }
+
+ /*
+ * 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, const dns_name_t *name, dns_dbversion_t *version,
+ dns_rdatatype_t type, unsigned int options, isc_stdtime_t now,
+ dns_dbnode_t **nodep, dns_name_t *foundname, dns_rdataset_t *rdataset,
+ dns_rdataset_t *sigrdataset) {
+ dns_rbtnode_t *node = NULL;
+ isc_result_t result;
+ rbtdb_search_t search;
+ bool cname_ok = true;
+ bool close_version = false;
+ bool maybe_zonecut = false;
+ bool at_zonecut = false;
+ bool wild;
+ bool empty_node;
+ rdatasetheader_t *header, *header_next, *found, *nsecheader;
+ rdatasetheader_t *foundsig, *cnamesig, *nsecsig;
+ rbtdb_rdatatype_t sigtype;
+ bool active;
+ nodelock_t *lock;
+ dns_rbt_t *tree;
+
+ search.rbtdb = (dns_rbtdb_t *)db;
+
+ REQUIRE(VALID_RBTDB(search.rbtdb));
+ INSIST(version == NULL ||
+ ((rbtdb_version_t *)version)->rbtdb == (dns_rbtdb_t *)db);
+
+ /*
+ * 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 = true;
+ }
+
+ search.rbtversion = version;
+ search.serial = search.rbtversion->serial;
+ search.options = options;
+ search.copy_name = false;
+ search.need_cleanup = false;
+ search.wild = false;
+ search.zonecut = NULL;
+ dns_fixedname_init(&search.zonecut_name);
+ dns_rbtnodechain_init(&search.chain);
+ search.now = 0;
+
+ /*
+ * 'wild' will be true iff. we've matched a wildcard.
+ */
+ wild = 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.
+ */
+ tree = (options & DNS_DBFIND_FORCENSEC3) != 0 ? search.rbtdb->nsec3
+ : search.rbtdb->tree;
+ result = dns_rbt_findnode(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) {
+ dns_name_copynf(name, foundname);
+ wild = true;
+ goto found;
+ } else if (result != ISC_R_NOTFOUND) {
+ goto tree_exit;
+ }
+ }
+
+ active = false;
+ if ((options & DNS_DBFIND_FORCENSEC3) == 0) {
+ /*
+ * The NSEC3 tree won't have empty nodes,
+ * so it isn't necessary to check for them.
+ */
+ dns_rbtnodechain_t 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.rbtversion->secure == dns_db_secure &&
+ !search.rbtversion->havensec3) ||
+ (search.options & DNS_DBFIND_FORCENSEC) != 0 ||
+ (search.options & DNS_DBFIND_FORCENSEC3) != 0)
+ {
+ result = find_closest_nsec(&search, nodep, foundname,
+ rdataset, sigrdataset, tree,
+ search.rbtversion->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 = false;
+ } else {
+ /*
+ * The node may be a zone cut itself. If it might be one,
+ * make sure we check for it later.
+ *
+ * DS records live above the zone cut in ordinary zone so
+ * we want to ignore any referral.
+ *
+ * Stub zones don't have anything "above" the delegation so
+ * we always return a referral.
+ */
+ if (node->find_callback &&
+ ((node != search.rbtdb->origin_node &&
+ !dns_rdatatype_atparent(type)) ||
+ IS_STUB(search.rbtdb)))
+ {
+ maybe_zonecut = true;
+ }
+ }
+
+ /*
+ * Certain DNSSEC types are not subject to CNAME matching
+ * (RFC4035, section 2.5 and RFC3007).
+ *
+ * We don't check for RRSIG, because we don't store RRSIG records
+ * directly.
+ */
+ if (type == dns_rdatatype_key || type == dns_rdatatype_nsec) {
+ cname_ok = false;
+ }
+
+ /*
+ * We now go looking for rdata...
+ */
+
+ lock = &search.rbtdb->node_locks[node->locknum].lock;
+ NODE_LOCK(lock, isc_rwlocktype_read);
+
+ found = NULL;
+ foundsig = NULL;
+ sigtype = RBTDB_RDATATYPE_VALUE(dns_rdatatype_rrsig, type);
+ nsecheader = NULL;
+ nsecsig = NULL;
+ cnamesig = NULL;
+ empty_node = 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 = 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,
+ isc_rwlocktype_read);
+ search.zonecut = node;
+ search.zonecut_rdataset = header;
+ search.zonecut_sigrdataset = NULL;
+ search.need_cleanup = true;
+ maybe_zonecut = false;
+ at_zonecut = true;
+ /*
+ * It is not clear if KEY should still be
+ * allowed at the parent side of the zone
+ * cut or not. It is needed for RFC3007
+ * validated updates.
+ */
+ if ((search.options & DNS_DBFIND_GLUEOK) == 0 &&
+ type != dns_rdatatype_nsec &&
+ type != dns_rdatatype_key)
+ {
+ /*
+ * 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 the NSEC3 record doesn't match the chain
+ * we are using behave as if it isn't here.
+ */
+ if (header->type == dns_rdatatype_nsec3 &&
+ !matchparams(header, &search))
+ {
+ NODE_UNLOCK(lock, isc_rwlocktype_read);
+ goto partial_match;
+ }
+ /*
+ * 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 &&
+ !search.rbtversion->havensec3)
+ {
+ /*
+ * 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 &&
+ !search.rbtversion->havensec3)
+ {
+ /*
+ * 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) {
+ NODE_UNLOCK(lock, isc_rwlocktype_read);
+ 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.
+ */
+ NODE_UNLOCK(lock, isc_rwlocktype_read);
+ result = setup_delegation(&search, nodep, foundname,
+ rdataset, sigrdataset);
+ goto tree_exit;
+ }
+ /*
+ * The desired type doesn't exist.
+ */
+ result = DNS_R_NXRRSET;
+ if (search.rbtversion->secure == dns_db_secure &&
+ !search.rbtversion->havensec3 &&
+ (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;
+ }
+
+ NODE_UNLOCK(lock, isc_rwlocktype_read);
+ result = find_closest_nsec(&search, nodep, foundname,
+ rdataset, sigrdataset,
+ search.rbtdb->tree,
+ search.rbtversion->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, isc_rwlocktype_read);
+ *nodep = node;
+ }
+ if ((search.rbtversion->secure == dns_db_secure &&
+ !search.rbtversion->havensec3) ||
+ (search.options & DNS_DBFIND_FORCENSEC) != 0)
+ {
+ bind_rdataset(search.rbtdb, node, nsecheader, 0,
+ isc_rwlocktype_read, rdataset);
+ if (nsecsig != NULL) {
+ bind_rdataset(search.rbtdb, node, nsecsig, 0,
+ isc_rwlocktype_read, 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) {
+ /*
+ * It is not clear if KEY should still be
+ * allowed at the parent side of the zone
+ * cut or not. It is needed for RFC3007
+ * validated updates.
+ */
+ if (type == dns_rdatatype_nsec ||
+ type == dns_rdatatype_nsec3 ||
+ type == dns_rdatatype_key)
+ {
+ 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))
+ {
+ NODE_UNLOCK(lock, isc_rwlocktype_read);
+ 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, isc_rwlocktype_read);
+ } else {
+ search.need_cleanup = false;
+ }
+ *nodep = node;
+ }
+
+ if (type != dns_rdatatype_any) {
+ bind_rdataset(search.rbtdb, node, found, 0, isc_rwlocktype_read,
+ rdataset);
+ if (foundsig != NULL) {
+ bind_rdataset(search.rbtdb, node, foundsig, 0,
+ isc_rwlocktype_read, sigrdataset);
+ }
+ }
+
+ if (wild) {
+ foundname->attributes |= DNS_NAMEATTR_WILDCARD;
+ }
+
+node_exit:
+ NODE_UNLOCK(lock, isc_rwlocktype_read);
+
+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;
+ INSIST(node != NULL);
+ lock = &(search.rbtdb->node_locks[node->locknum].lock);
+
+ NODE_LOCK(lock, isc_rwlocktype_read);
+ decrement_reference(search.rbtdb, node, 0, isc_rwlocktype_read,
+ isc_rwlocktype_none, false);
+ NODE_UNLOCK(lock, isc_rwlocktype_read);
+ }
+
+ if (close_version) {
+ closeversion(db, &version, false);
+ }
+
+ dns_rbtnodechain_reset(&search.chain);
+
+ return (result);
+}
+
+static isc_result_t
+zone_findzonecut(dns_db_t *db, const dns_name_t *name, unsigned int options,
+ isc_stdtime_t now, dns_dbnode_t **nodep, dns_name_t *foundname,
+ dns_name_t *dcname, dns_rdataset_t *rdataset,
+ dns_rdataset_t *sigrdataset) {
+ UNUSED(db);
+ UNUSED(name);
+ UNUSED(options);
+ UNUSED(now);
+ UNUSED(nodep);
+ UNUSED(foundname);
+ UNUSED(dcname);
+ UNUSED(rdataset);
+ UNUSED(sigrdataset);
+
+ FATAL_ERROR(__FILE__, __LINE__, "zone_findzonecut() called!");
+
+ UNREACHABLE();
+ return (ISC_R_NOTIMPLEMENTED);
+}
+
+static bool
+check_stale_header(dns_rbtnode_t *node, rdatasetheader_t *header,
+ isc_rwlocktype_t *locktype, nodelock_t *lock,
+ rbtdb_search_t *search, rdatasetheader_t **header_prev) {
+ if (!ACTIVE(header, search->now)) {
+ dns_ttl_t stale = header->rdh_ttl +
+ search->rbtdb->serve_stale_ttl;
+ /*
+ * If this data is in the stale window keep it and if
+ * DNS_DBFIND_STALEOK is not set we tell the caller to
+ * skip this record. We skip the records with ZEROTTL
+ * (these records should not be cached anyway).
+ */
+
+ RDATASET_ATTR_CLR(header, RDATASET_ATTR_STALE_WINDOW);
+ if (!ZEROTTL(header) && KEEPSTALE(search->rbtdb) &&
+ stale > search->now)
+ {
+ mark_header_stale(search->rbtdb, header);
+ *header_prev = header;
+ /*
+ * If DNS_DBFIND_STALESTART is set then it means we
+ * failed to resolve the name during recursion, in
+ * this case we mark the time in which the refresh
+ * failed.
+ */
+ if ((search->options & DNS_DBFIND_STALESTART) != 0) {
+ atomic_store_release(
+ &header->last_refresh_fail_ts,
+ search->now);
+ } else if ((search->options &
+ DNS_DBFIND_STALEENABLED) != 0 &&
+ search->now <
+ (atomic_load_acquire(
+ &header->last_refresh_fail_ts) +
+ search->rbtdb->serve_stale_refresh))
+ {
+ /*
+ * If we are within interval between last
+ * refresh failure time + 'stale-refresh-time',
+ * then don't skip this stale entry but use it
+ * instead.
+ */
+ RDATASET_ATTR_SET(header,
+ RDATASET_ATTR_STALE_WINDOW);
+ return (false);
+ } else if ((search->options &
+ DNS_DBFIND_STALETIMEOUT) != 0)
+ {
+ /*
+ * We want stale RRset due to timeout, so we
+ * don't skip it.
+ */
+ return (false);
+ }
+ return ((search->options & DNS_DBFIND_STALEOK) == 0);
+ }
+
+ /*
+ * This rdataset is stale. If no one else is using the
+ * node, we can clean it up right now, otherwise we mark
+ * it as ancient, and the node as dirty, so it will get
+ * cleaned up later.
+ */
+ if ((header->rdh_ttl < search->now - RBTDB_VIRTUAL) &&
+ (*locktype == isc_rwlocktype_write ||
+ NODE_TRYUPGRADE(lock) == ISC_R_SUCCESS))
+ {
+ /*
+ * We update the node's status only when we can
+ * get write access; otherwise, we leave others
+ * to this work. Periodical cleaning will
+ * eventually take the job as the last resort.
+ * We won't downgrade the lock, since other
+ * rdatasets are probably stale, too.
+ */
+ *locktype = isc_rwlocktype_write;
+
+ if (isc_refcount_current(&node->references) == 0) {
+ isc_mem_t *mctx;
+
+ /*
+ * header->down can be non-NULL if the
+ * refcount has just decremented to 0
+ * but decrement_reference() has not
+ * performed clean_cache_node(), in
+ * which case we need to purge the stale
+ * headers first.
+ */
+ mctx = search->rbtdb->common.mctx;
+ clean_stale_headers(search->rbtdb, mctx,
+ header);
+ if (*header_prev != NULL) {
+ (*header_prev)->next = header->next;
+ } else {
+ node->data = header->next;
+ }
+ free_rdataset(search->rbtdb, mctx, header);
+ } else {
+ mark_header_ancient(search->rbtdb, header);
+ *header_prev = header;
+ }
+ } else {
+ *header_prev = header;
+ }
+ return (true);
+ }
+ return (false);
+}
+
+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;
+ nodelock_t *lock;
+ isc_rwlocktype_t locktype;
+
+ /* XXX comment */
+
+ REQUIRE(search->zonecut == NULL);
+
+ /*
+ * Keep compiler silent.
+ */
+ UNUSED(name);
+
+ lock = &(search->rbtdb->node_locks[node->locknum].lock);
+ locktype = isc_rwlocktype_read;
+ NODE_LOCK(lock, locktype);
+
+ /*
+ * 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 (check_stale_header(node, header, &locktype, lock, search,
+ &header_prev))
+ {
+ /* Do nothing. */
+ } else if (header->type == dns_rdatatype_dname &&
+ EXISTS(header) && !ANCIENT(header))
+ {
+ dname_header = header;
+ header_prev = header;
+ } else if (header->type == RBTDB_RDATATYPE_SIGDNAME &&
+ EXISTS(header) && !ANCIENT(header))
+ {
+ sigdname_header = header;
+ header_prev = header;
+ } else {
+ header_prev = header;
+ }
+ }
+
+ if (dname_header != NULL &&
+ (!DNS_TRUST_PENDING(dname_header->trust) ||
+ (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, locktype);
+ search->zonecut = node;
+ search->zonecut_rdataset = dname_header;
+ search->zonecut_sigrdataset = sigdname_header;
+ search->need_cleanup = true;
+ result = DNS_R_PARTIALMATCH;
+ } else {
+ result = DNS_R_CONTINUE;
+ }
+
+ NODE_UNLOCK(lock, locktype);
+
+ return (result);
+}
+
+static 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;
+ bool done;
+ nodelock_t *lock;
+ isc_rwlocktype_t locktype;
+
+ /*
+ * Caller must be holding the tree lock.
+ */
+
+ rbtdb = search->rbtdb;
+ i = search->chain.level_matches;
+ done = false;
+ do {
+ locktype = isc_rwlocktype_read;
+ lock = &rbtdb->node_locks[node->locknum].lock;
+ NODE_LOCK(lock, locktype);
+
+ /*
+ * 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 (check_stale_header(node, header, &locktype, lock,
+ search, &header_prev))
+ {
+ /* Do nothing. */
+ } else if (EXISTS(header) && !ANCIENT(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);
+ dns_name_copynf(&name, foundname);
+ while (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) {
+ if (nodep != NULL) {
+ *nodep = NULL;
+ }
+ goto node_exit;
+ }
+ }
+ }
+ result = DNS_R_DELEGATION;
+ if (nodep != NULL) {
+ new_reference(search->rbtdb, node, locktype);
+ *nodep = node;
+ }
+ bind_rdataset(search->rbtdb, node, found, search->now,
+ locktype, rdataset);
+ if (foundsig != NULL) {
+ bind_rdataset(search->rbtdb, node, foundsig,
+ search->now, locktype,
+ sigrdataset);
+ }
+ if (need_headerupdate(found, search->now) ||
+ (foundsig != NULL &&
+ need_headerupdate(foundsig, search->now)))
+ {
+ if (locktype != isc_rwlocktype_write) {
+ NODE_UNLOCK(lock, locktype);
+ NODE_LOCK(lock, isc_rwlocktype_write);
+ locktype = isc_rwlocktype_write;
+ POST(locktype);
+ }
+ if (need_headerupdate(found, search->now)) {
+ update_header(search->rbtdb, found,
+ search->now);
+ }
+ if (foundsig != NULL &&
+ need_headerupdate(foundsig, search->now))
+ {
+ update_header(search->rbtdb, foundsig,
+ search->now);
+ }
+ }
+ }
+
+ node_exit:
+ NODE_UNLOCK(lock, locktype);
+
+ if (found == NULL && i > 0) {
+ i--;
+ node = search->chain.levels[i];
+ } else {
+ done = 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;
+ bool empty_node;
+ isc_result_t result;
+ dns_fixedname_t fname, forigin;
+ dns_name_t *name, *origin;
+ rbtdb_rdatatype_t matchtype, sigmatchtype;
+ nodelock_t *lock;
+ isc_rwlocktype_t locktype;
+ dns_rbtnodechain_t chain;
+
+ chain = search->chain;
+
+ matchtype = RBTDB_RDATATYPE_VALUE(dns_rdatatype_nsec, 0);
+ sigmatchtype = RBTDB_RDATATYPE_VALUE(dns_rdatatype_rrsig,
+ dns_rdatatype_nsec);
+
+ do {
+ node = NULL;
+ name = dns_fixedname_initname(&fname);
+ origin = dns_fixedname_initname(&forigin);
+ result = dns_rbtnodechain_current(&chain, name, origin, &node);
+ if (result != ISC_R_SUCCESS) {
+ return (result);
+ }
+ locktype = isc_rwlocktype_read;
+ lock = &(search->rbtdb->node_locks[node->locknum].lock);
+ NODE_LOCK(lock, locktype);
+ found = NULL;
+ foundsig = NULL;
+ empty_node = true;
+ header_prev = NULL;
+ for (header = node->data; header != NULL; header = header_next)
+ {
+ header_next = header->next;
+ if (check_stale_header(node, header, &locktype, lock,
+ search, &header_prev))
+ {
+ continue;
+ }
+ if (NONEXISTENT(header) ||
+ RBTDB_RDATATYPE_BASE(header->type) == 0)
+ {
+ header_prev = header;
+ continue;
+ }
+ /*
+ * Don't stop on provable noqname / RRSIG.
+ */
+ if (header->noqname == NULL &&
+ RBTDB_RDATATYPE_BASE(header->type) !=
+ dns_rdatatype_rrsig)
+ {
+ empty_node = 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, locktype,
+ rdataset);
+ if (foundsig != NULL) {
+ bind_rdataset(search->rbtdb, node, foundsig,
+ now, locktype, sigrdataset);
+ }
+ new_reference(search->rbtdb, node, locktype);
+ *nodep = node;
+ result = DNS_R_COVERINGNSEC;
+ } else if (!empty_node) {
+ result = ISC_R_NOTFOUND;
+ } else {
+ result = dns_rbtnodechain_prev(&chain, NULL, NULL);
+ }
+ unlock_node:
+ NODE_UNLOCK(lock, locktype);
+ } while (empty_node && result == ISC_R_SUCCESS);
+ return (result);
+}
+
+static isc_result_t
+cache_find(dns_db_t *db, const dns_name_t *name, dns_dbversion_t *version,
+ dns_rdatatype_t type, unsigned int options, isc_stdtime_t now,
+ dns_dbnode_t **nodep, dns_name_t *foundname,
+ dns_rdataset_t *rdataset, dns_rdataset_t *sigrdataset) {
+ dns_rbtnode_t *node = NULL;
+ isc_result_t result;
+ rbtdb_search_t search;
+ bool cname_ok = true;
+ bool empty_node;
+ nodelock_t *lock;
+ isc_rwlocktype_t locktype;
+ rdatasetheader_t *header, *header_prev, *header_next;
+ rdatasetheader_t *found, *nsheader;
+ rdatasetheader_t *foundsig, *nssig, *cnamesig;
+ rdatasetheader_t *update, *updatesig;
+ rdatasetheader_t *nsecheader, *nsecsig;
+ rbtdb_rdatatype_t sigtype, negtype;
+
+ 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 = false;
+ search.need_cleanup = false;
+ search.wild = false;
+ search.zonecut = NULL;
+ dns_fixedname_init(&search.zonecut_name);
+ dns_rbtnodechain_init(&search.chain);
+ search.now = now;
+ update = NULL;
+ updatesig = NULL;
+
+ 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
+ * (RFC4035, section 2.5 and RFC3007).
+ *
+ * We don't check for RRSIG, because we don't store RRSIG records
+ * directly.
+ */
+ if (type == dns_rdatatype_key || type == dns_rdatatype_nsec) {
+ cname_ok = false;
+ }
+
+ /*
+ * We now go looking for rdata...
+ */
+
+ lock = &(search.rbtdb->node_locks[node->locknum].lock);
+ locktype = isc_rwlocktype_read;
+ NODE_LOCK(lock, locktype);
+
+ found = NULL;
+ foundsig = NULL;
+ sigtype = RBTDB_RDATATYPE_VALUE(dns_rdatatype_rrsig, type);
+ negtype = RBTDB_RDATATYPE_VALUE(0, type);
+ nsheader = NULL;
+ nsecheader = NULL;
+ nssig = NULL;
+ nsecsig = NULL;
+ cnamesig = NULL;
+ empty_node = true;
+ header_prev = NULL;
+ for (header = node->data; header != NULL; header = header_next) {
+ header_next = header->next;
+ if (check_stale_header(node, header, &locktype, lock, &search,
+ &header_prev))
+ {
+ /* Do nothing. */
+ } else if (EXISTS(header) && !ANCIENT(header)) {
+ /*
+ * We now know that there is at least one active
+ * non-stale rdataset at this node.
+ */
+ empty_node = 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.
+ */
+ 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 == negtype)
+ {
+ /*
+ * 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 (header->type == dns_rdatatype_nsec) {
+ nsecheader = header;
+ } else if (header->type == RBTDB_RDATATYPE_SIGNSEC) {
+ 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;
+ }
+ 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.
+ */
+ NODE_UNLOCK(lock, locktype);
+ goto find_ns;
+ }
+
+ /*
+ * If we didn't find what we were looking for...
+ */
+ if (found == NULL ||
+ (DNS_TRUST_ADDITIONAL(found->trust) &&
+ ((options & DNS_DBFIND_ADDITIONALOK) == 0)) ||
+ (found->trust == dns_trust_glue &&
+ ((options & DNS_DBFIND_GLUEOK) == 0)) ||
+ (DNS_TRUST_PENDING(found->trust) &&
+ ((options & DNS_DBFIND_PENDINGOK) == 0)))
+ {
+ /*
+ * Return covering NODATA NSEC record.
+ */
+ if ((search.options & DNS_DBFIND_COVERINGNSEC) != 0 &&
+ nsecheader != NULL)
+ {
+ if (nodep != NULL) {
+ new_reference(search.rbtdb, node, locktype);
+ *nodep = node;
+ }
+ bind_rdataset(search.rbtdb, node, nsecheader,
+ search.now, locktype, rdataset);
+ if (need_headerupdate(nsecheader, search.now)) {
+ update = nsecheader;
+ }
+ if (nsecsig != NULL) {
+ bind_rdataset(search.rbtdb, node, nsecsig,
+ search.now, locktype,
+ sigrdataset);
+ if (need_headerupdate(nsecsig, search.now)) {
+ updatesig = nsecsig;
+ }
+ }
+ result = DNS_R_COVERINGNSEC;
+ goto node_exit;
+ }
+
+ /*
+ * 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, locktype);
+ *nodep = node;
+ }
+ bind_rdataset(search.rbtdb, node, nsheader, search.now,
+ locktype, rdataset);
+ if (need_headerupdate(nsheader, search.now)) {
+ update = nsheader;
+ }
+ if (nssig != NULL) {
+ bind_rdataset(search.rbtdb, node, nssig,
+ search.now, locktype,
+ sigrdataset);
+ if (need_headerupdate(nssig, search.now)) {
+ updatesig = nssig;
+ }
+ }
+ result = DNS_R_DELEGATION;
+ goto node_exit;
+ }
+
+ /*
+ * Go find the deepest zone cut.
+ */
+ NODE_UNLOCK(lock, locktype);
+ goto find_ns;
+ }
+
+ /*
+ * We found what we were looking for, or we found a CNAME.
+ */
+
+ if (nodep != NULL) {
+ new_reference(search.rbtdb, node, locktype);
+ *nodep = node;
+ }
+
+ if (NEGATIVE(found)) {
+ /*
+ * 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, locktype,
+ rdataset);
+ if (need_headerupdate(found, search.now)) {
+ update = found;
+ }
+ if (!NEGATIVE(found) && foundsig != NULL) {
+ bind_rdataset(search.rbtdb, node, foundsig, search.now,
+ locktype, sigrdataset);
+ if (need_headerupdate(foundsig, search.now)) {
+ updatesig = foundsig;
+ }
+ }
+ }
+
+node_exit:
+ if ((update != NULL || updatesig != NULL) &&
+ locktype != isc_rwlocktype_write)
+ {
+ NODE_UNLOCK(lock, locktype);
+ NODE_LOCK(lock, isc_rwlocktype_write);
+ locktype = isc_rwlocktype_write;
+ POST(locktype);
+ }
+ if (update != NULL && need_headerupdate(update, search.now)) {
+ update_header(search.rbtdb, update, search.now);
+ }
+ if (updatesig != NULL && need_headerupdate(updatesig, search.now)) {
+ update_header(search.rbtdb, updatesig, search.now);
+ }
+
+ NODE_UNLOCK(lock, locktype);
+
+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;
+ INSIST(node != NULL);
+ lock = &(search.rbtdb->node_locks[node->locknum].lock);
+
+ NODE_LOCK(lock, isc_rwlocktype_read);
+ decrement_reference(search.rbtdb, node, 0, isc_rwlocktype_read,
+ isc_rwlocktype_none, false);
+ NODE_UNLOCK(lock, isc_rwlocktype_read);
+ }
+
+ dns_rbtnodechain_reset(&search.chain);
+
+ update_cachestats(search.rbtdb, result);
+ return (result);
+}
+
+static isc_result_t
+cache_findzonecut(dns_db_t *db, const dns_name_t *name, unsigned int options,
+ isc_stdtime_t now, dns_dbnode_t **nodep,
+ dns_name_t *foundname, dns_name_t *dcname,
+ dns_rdataset_t *rdataset, dns_rdataset_t *sigrdataset) {
+ dns_rbtnode_t *node = NULL;
+ nodelock_t *lock;
+ 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;
+ isc_rwlocktype_t locktype;
+ bool dcnull = (dcname == NULL);
+
+ 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 = false;
+ search.need_cleanup = false;
+ search.wild = false;
+ search.zonecut = NULL;
+ dns_fixedname_init(&search.zonecut_name);
+ dns_rbtnodechain_init(&search.chain);
+ search.now = now;
+
+ if (dcnull) {
+ dcname = foundname;
+ }
+
+ 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, dcname, &node,
+ &search.chain, rbtoptions, NULL, &search);
+
+ if (result == DNS_R_PARTIALMATCH) {
+ result = find_deepest_zonecut(&search, node, nodep, foundname,
+ rdataset, sigrdataset);
+ goto tree_exit;
+ } else if (result != ISC_R_SUCCESS) {
+ goto tree_exit;
+ } else if (!dcnull) {
+ dns_name_copynf(dcname, foundname);
+ }
+
+ /*
+ * We now go looking for an NS rdataset at the node.
+ */
+
+ lock = &(search.rbtdb->node_locks[node->locknum].lock);
+ locktype = isc_rwlocktype_read;
+ NODE_LOCK(lock, locktype);
+
+ found = NULL;
+ foundsig = NULL;
+ header_prev = NULL;
+ for (header = node->data; header != NULL; header = header_next) {
+ header_next = header->next;
+ if (check_stale_header(node, header, &locktype, lock, &search,
+ &header_prev))
+ {
+ /*
+ * The function dns_rbt_findnode found us the a matching
+ * node for 'name' and stored the result in 'dcname'.
+ * This is the deepest known zonecut in our database.
+ * However, this node may be stale and if serve-stale
+ * is not enabled (in other words 'stale-answer-enable'
+ * is set to no), this node may not be used as a
+ * zonecut we know about. If so, find the deepest
+ * zonecut from this node up and return that instead.
+ */
+ NODE_UNLOCK(lock, locktype);
+ result = find_deepest_zonecut(&search, node, nodep,
+ foundname, rdataset,
+ sigrdataset);
+ dns_name_copynf(foundname, dcname);
+ goto tree_exit;
+ } else if (EXISTS(header) && !ANCIENT(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.
+ */
+ NODE_UNLOCK(lock, locktype);
+ result = find_deepest_zonecut(&search, node, nodep, foundname,
+ rdataset, sigrdataset);
+ goto tree_exit;
+ }
+
+ if (nodep != NULL) {
+ new_reference(search.rbtdb, node, locktype);
+ *nodep = node;
+ }
+
+ bind_rdataset(search.rbtdb, node, found, search.now, locktype,
+ rdataset);
+ if (foundsig != NULL) {
+ bind_rdataset(search.rbtdb, node, foundsig, search.now,
+ locktype, sigrdataset);
+ }
+
+ if (need_headerupdate(found, search.now) ||
+ (foundsig != NULL && need_headerupdate(foundsig, search.now)))
+ {
+ if (locktype != isc_rwlocktype_write) {
+ NODE_UNLOCK(lock, locktype);
+ NODE_LOCK(lock, isc_rwlocktype_write);
+ locktype = isc_rwlocktype_write;
+ POST(locktype);
+ }
+ if (need_headerupdate(found, search.now)) {
+ update_header(search.rbtdb, found, search.now);
+ }
+ if (foundsig != NULL && need_headerupdate(foundsig, search.now))
+ {
+ update_header(search.rbtdb, foundsig, search.now);
+ }
+ }
+
+ NODE_UNLOCK(lock, locktype);
+
+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);
+
+ isc_refcount_increment(&node->references);
+
+ *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;
+ bool want_free = false;
+ bool inactive = false;
+ rbtdb_nodelock_t *nodelock;
+
+ REQUIRE(VALID_RBTDB(rbtdb));
+ REQUIRE(targetp != NULL && *targetp != NULL);
+
+ node = (dns_rbtnode_t *)(*targetp);
+ nodelock = &rbtdb->node_locks[node->locknum];
+
+ NODE_LOCK(&nodelock->lock, isc_rwlocktype_read);
+
+ if (decrement_reference(rbtdb, node, 0, isc_rwlocktype_read,
+ isc_rwlocktype_none, false))
+ {
+ if (isc_refcount_current(&nodelock->references) == 0 &&
+ nodelock->exiting)
+ {
+ inactive = true;
+ }
+ }
+
+ NODE_UNLOCK(&nodelock->lock, isc_rwlocktype_read);
+
+ *targetp = NULL;
+
+ if (inactive) {
+ RBTDB_LOCK(&rbtdb->lock, isc_rwlocktype_write);
+ rbtdb->active--;
+ if (rbtdb->active == 0) {
+ want_free = true;
+ }
+ RBTDB_UNLOCK(&rbtdb->lock, isc_rwlocktype_write);
+ 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 {
+ strlcpy(buf, "<UNKNOWN>", sizeof(buf));
+ }
+ isc_log_write(dns_lctx, DNS_LOGCATEGORY_DATABASE,
+ DNS_LOGMODULE_CACHE, ISC_LOG_DEBUG(1),
+ "calling free_rbtdb(%s)", buf);
+ free_rbtdb(rbtdb, 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;
+ bool force_expire = false;
+ /*
+ * These are the category and module used by the cache cleaner.
+ */
+ bool log = 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 (isc_mem_isovermem(rbtdb->common.mctx)) {
+ /*
+ * Force expire with 25% probability.
+ * XXXDCL Could stand to have a better policy, like LRU.
+ */
+ force_expire = (rbtnode->down == NULL &&
+ (isc_random32() % 4) == 0);
+
+ /*
+ * Note that 'log' can be true IFF overmem is also true.
+ * overmem can currently only be true for cache
+ * databases -- hence all of the "overmem cache" log strings.
+ */
+ log = 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)));
+ }
+ }
+
+ /*
+ * We may not need write access, but this code path is not performance
+ * sensitive, so it should be okay to always lock as a writer.
+ */
+ NODE_LOCK(&rbtdb->node_locks[rbtnode->locknum].lock,
+ isc_rwlocktype_write);
+
+ for (header = rbtnode->data; header != NULL; header = header->next) {
+ if (header->rdh_ttl + rbtdb->serve_stale_ttl <=
+ now - RBTDB_VIRTUAL)
+ {
+ /*
+ * We don't check if refcurrent(rbtnode) == 0 and try
+ * to free like we do in cache_find(), because
+ * refcurrent(rbtnode) must be non-zero. This is so
+ * because 'node' is an argument to the function.
+ */
+ mark_header_ancient(rbtdb, header);
+ if (log) {
+ isc_log_write(dns_lctx, category, module, level,
+ "overmem cache: ancient %s",
+ printname);
+ }
+ } else if (force_expire) {
+ if (!RETAIN(header)) {
+ set_ttl(rbtdb, header, 0);
+ mark_header_ancient(rbtdb, header);
+ } else if (log) {
+ isc_log_write(dns_lctx, category, module, level,
+ "overmem cache: "
+ "reprieve by RETAIN() %s",
+ printname);
+ }
+ } else if (isc_mem_isovermem(rbtdb->common.mctx) && log) {
+ isc_log_write(dns_lctx, category, module, level,
+ "overmem cache: saved %s", printname);
+ }
+ }
+
+ NODE_UNLOCK(&rbtdb->node_locks[rbtnode->locknum].lock,
+ isc_rwlocktype_write);
+
+ return (ISC_R_SUCCESS);
+}
+
+static void
+overmem(dns_db_t *db, bool over) {
+ /* This is an empty callback. See adb.c:water() */
+
+ UNUSED(db);
+ UNUSED(over);
+
+ return;
+}
+
+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;
+ bool first;
+ uint32_t refs;
+
+ REQUIRE(VALID_RBTDB(rbtdb));
+
+ NODE_LOCK(&rbtdb->node_locks[rbtnode->locknum].lock,
+ isc_rwlocktype_read);
+
+ refs = isc_refcount_current(&rbtnode->references);
+ fprintf(out, "node %p, %" PRIu32 " references, locknum = %u\n", rbtnode,
+ refs, 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 = true;
+ fprintf(out, "\ttype %u", current->type);
+ do {
+ uint_least16_t attributes = atomic_load_acquire(
+ &current->attributes);
+ if (!first) {
+ fprintf(out, "\t");
+ }
+ first = false;
+ fprintf(out,
+ "\tserial = %lu, ttl = %u, "
+ "trust = %u, attributes = %" PRIuLEAST16
+ ", "
+ "resign = %u\n",
+ (unsigned long)current->serial,
+ current->rdh_ttl, current->trust,
+ attributes,
+ (current->resign << 1) |
+ current->resign_lsb);
+ current = current->down;
+ } while (current != NULL);
+ }
+ } else {
+ fprintf(out, "(empty)\n");
+ }
+
+ NODE_UNLOCK(&rbtdb->node_locks[rbtnode->locknum].lock,
+ isc_rwlocktype_read);
+}
+
+static isc_result_t
+createiterator(dns_db_t *db, unsigned int options,
+ 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));
+
+ rbtdbiter->common.methods = &dbiterator_methods;
+ rbtdbiter->common.db = NULL;
+ dns_db_attach(db, &rbtdbiter->common.db);
+ rbtdbiter->common.relative_names = ((options & DNS_DB_RELATIVENAMES) !=
+ 0);
+ rbtdbiter->common.magic = DNS_DBITERATOR_MAGIC;
+ rbtdbiter->common.cleaning = false;
+ rbtdbiter->paused = 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->delcnt = 0;
+ rbtdbiter->nsec3only = ((options & DNS_DB_NSEC3ONLY) != 0);
+ rbtdbiter->nonsec3 = ((options & DNS_DB_NONSEC3) != 0);
+ memset(rbtdbiter->deletions, 0, sizeof(rbtdbiter->deletions));
+ dns_rbtnodechain_init(&rbtdbiter->chain);
+ dns_rbtnodechain_init(&rbtdbiter->nsec3chain);
+ if (rbtdbiter->nsec3only) {
+ rbtdbiter->current = &rbtdbiter->nsec3chain;
+ } else {
+ rbtdbiter->current = &rbtdbiter->chain;
+ }
+
+ *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;
+ bool close_version = false;
+ rbtdb_rdatatype_t matchtype, sigmatchtype;
+
+ REQUIRE(VALID_RBTDB(rbtdb));
+ REQUIRE(type != dns_rdatatype_any);
+ INSIST(rbtversion == NULL || rbtversion->rbtdb == rbtdb);
+
+ if (rbtversion == NULL) {
+ currentversion(db, (dns_dbversion_t **)(void *)(&rbtversion));
+ close_version = true;
+ }
+ serial = rbtversion->serial;
+ now = 0;
+
+ NODE_LOCK(&rbtdb->node_locks[rbtnode->locknum].lock,
+ isc_rwlocktype_read);
+
+ 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, isc_rwlocktype_read,
+ rdataset);
+ if (foundsig != NULL) {
+ bind_rdataset(rbtdb, rbtnode, foundsig, now,
+ isc_rwlocktype_read, sigrdataset);
+ }
+ }
+
+ NODE_UNLOCK(&rbtdb->node_locks[rbtnode->locknum].lock,
+ isc_rwlocktype_read);
+
+ if (close_version) {
+ closeversion(db, (dns_dbversion_t **)(void *)(&rbtversion),
+ 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, negtype;
+ isc_result_t result;
+ nodelock_t *lock;
+ isc_rwlocktype_t locktype;
+
+ 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;
+ locktype = isc_rwlocktype_read;
+ NODE_LOCK(lock, locktype);
+
+ found = NULL;
+ foundsig = NULL;
+ matchtype = RBTDB_RDATATYPE_VALUE(type, covers);
+ negtype = 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 (!ACTIVE(header, now)) {
+ if ((header->rdh_ttl + rbtdb->serve_stale_ttl <
+ now - RBTDB_VIRTUAL) &&
+ (locktype == isc_rwlocktype_write ||
+ NODE_TRYUPGRADE(lock) == ISC_R_SUCCESS))
+ {
+ /*
+ * We update the node's status only when we
+ * can get write access.
+ */
+ locktype = isc_rwlocktype_write;
+
+ /*
+ * We don't check if refcurrent(rbtnode) == 0
+ * and try to free like we do in cache_find(),
+ * because refcurrent(rbtnode) must be
+ * non-zero. This is so because 'node' is an
+ * argument to the function.
+ */
+ mark_header_ancient(rbtdb, header);
+ }
+ } else if (EXISTS(header) && !ANCIENT(header)) {
+ if (header->type == matchtype) {
+ found = header;
+ } else if (header->type == RBTDB_RDATATYPE_NCACHEANY ||
+ header->type == negtype)
+ {
+ found = header;
+ } else if (header->type == sigmatchtype) {
+ foundsig = header;
+ }
+ }
+ }
+ if (found != NULL) {
+ bind_rdataset(rbtdb, rbtnode, found, now, locktype, rdataset);
+ if (!NEGATIVE(found) && foundsig != NULL) {
+ bind_rdataset(rbtdb, rbtnode, foundsig, now, locktype,
+ sigrdataset);
+ }
+ }
+
+ NODE_UNLOCK(lock, locktype);
+
+ if (found == NULL) {
+ return (ISC_R_NOTFOUND);
+ }
+
+ if (NEGATIVE(found)) {
+ /*
+ * We found a negative cache entry.
+ */
+ if (NXDOMAIN(found)) {
+ result = DNS_R_NCACHENXDOMAIN;
+ } else {
+ result = DNS_R_NCACHENXRRSET;
+ }
+ }
+
+ update_cachestats(rbtdb, result);
+
+ return (result);
+}
+
+static isc_result_t
+allrdatasets(dns_db_t *db, dns_dbnode_t *node, dns_dbversion_t *version,
+ unsigned int options, 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 ((db->attributes & DNS_DBATTR_CACHE) == 0) {
+ now = 0;
+ if (rbtversion == NULL) {
+ currentversion(
+ db, (dns_dbversion_t **)(void *)(&rbtversion));
+ } else {
+ INSIST(rbtversion->rbtdb == rbtdb);
+
+ (void)isc_refcount_increment(&rbtversion->references);
+ }
+ } 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.options = options;
+ iterator->common.now = now;
+
+ isc_refcount_increment(&rbtnode->references);
+
+ iterator->current = NULL;
+
+ *iteratorp = (dns_rdatasetiter_t *)iterator;
+
+ return (ISC_R_SUCCESS);
+}
+
+static bool
+cname_and_other_data(dns_rbtnode_t *node, rbtdb_serial_t serial) {
+ rdatasetheader_t *header, *header_next;
+ bool 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 = false;
+ other_data = 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 = true;
+ }
+ } else {
+ /*
+ * Look for active extant "other data".
+ *
+ * "Other data" is any rdataset whose type is not
+ * KEY, NSEC, SIG or RRSIG.
+ */
+ rdtype = RBTDB_RDATATYPE_BASE(header->type);
+ if (rdtype != dns_rdatatype_key &&
+ rdtype != dns_rdatatype_sig &&
+ rdtype != dns_rdatatype_nsec &&
+ rdtype != dns_rdatatype_rrsig)
+ {
+ /*
+ * 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 = true;
+ }
+ }
+ }
+ }
+
+ if (cname && other_data) {
+ return (true);
+ }
+
+ return (false);
+}
+
+static void
+resign_insert(dns_rbtdb_t *rbtdb, int idx, rdatasetheader_t *newheader) {
+ INSIST(!IS_CACHE(rbtdb));
+ INSIST(newheader->heap_index == 0);
+ INSIST(!ISC_LINK_LINKED(newheader, link));
+
+ isc_heap_insert(rbtdb->heaps[idx], newheader);
+}
+
+/*
+ * node write lock must be held.
+ */
+static void
+resign_delete(dns_rbtdb_t *rbtdb, rbtdb_version_t *version,
+ rdatasetheader_t *header) {
+ /*
+ * Remove the old header from the heap
+ */
+ if (header != NULL && header->heap_index != 0) {
+ isc_heap_delete(rbtdb->heaps[header->node->locknum],
+ header->heap_index);
+ header->heap_index = 0;
+ if (version != NULL) {
+ new_reference(rbtdb, header->node,
+ isc_rwlocktype_write);
+ ISC_LIST_APPEND(version->resigned_list, header, link);
+ }
+ }
+}
+
+static uint64_t
+recordsize(rdatasetheader_t *header, unsigned int namelen) {
+ return (dns_rdataslab_rdatasize((unsigned char *)header,
+ sizeof(*header)) +
+ sizeof(dns_ttl_t) + sizeof(dns_rdatatype_t) +
+ sizeof(dns_rdataclass_t) + namelen);
+}
+
+static void
+update_recordsandxfrsize(bool add, rbtdb_version_t *rbtversion,
+ rdatasetheader_t *header, unsigned int namelen) {
+ unsigned char *hdr = (unsigned char *)header;
+ size_t hdrsize = sizeof(*header);
+
+ RWLOCK(&rbtversion->rwlock, isc_rwlocktype_write);
+ if (add) {
+ rbtversion->records += dns_rdataslab_count(hdr, hdrsize);
+ rbtversion->xfrsize += recordsize(header, namelen);
+ } else {
+ rbtversion->records -= dns_rdataslab_count(hdr, hdrsize);
+ rbtversion->xfrsize -= recordsize(header, namelen);
+ }
+ RWUNLOCK(&rbtversion->rwlock, isc_rwlocktype_write);
+}
+
+/*
+ * write lock on rbtnode must be held.
+ */
+static isc_result_t
+add32(dns_rbtdb_t *rbtdb, dns_rbtnode_t *rbtnode, const dns_name_t *nodename,
+ rbtdb_version_t *rbtversion, rdatasetheader_t *newheader,
+ unsigned int options, bool loading, dns_rdataset_t *addedrdataset,
+ isc_stdtime_t now) {
+ rbtdb_changed_t *changed = NULL;
+ rdatasetheader_t *topheader = NULL, *topheader_prev = NULL;
+ rdatasetheader_t *header = NULL, *sigheader = NULL;
+ unsigned char *merged = NULL;
+ isc_result_t result;
+ bool header_nx;
+ bool newheader_nx;
+ bool merge;
+ dns_rdatatype_t rdtype, covers;
+ rbtdb_rdatatype_t negtype, sigtype;
+ dns_trust_t trust;
+ int idx;
+
+ /*
+ * Add an rdatasetheader_t to a node.
+ */
+
+ /*
+ * Caller must be holding the node lock.
+ */
+
+ if ((options & DNS_DBADD_MERGE) != 0) {
+ REQUIRE(rbtversion != NULL);
+ merge = true;
+ } else {
+ merge = 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, rbtdb->common.mctx, newheader);
+ return (ISC_R_NOMEMORY);
+ }
+ }
+
+ newheader_nx = NONEXISTENT(newheader) ? true : false;
+ topheader_prev = NULL;
+ sigheader = NULL;
+ negtype = 0;
+ if (rbtversion == NULL && !newheader_nx) {
+ rdtype = RBTDB_RDATATYPE_BASE(newheader->type);
+ covers = RBTDB_RDATATYPE_EXT(newheader->type);
+ sigtype = RBTDB_RDATATYPE_VALUE(dns_rdatatype_rrsig, covers);
+ if (NEGATIVE(newheader)) {
+ /*
+ * We're adding a negative cache entry.
+ */
+ if (covers == dns_rdatatype_any) {
+ /*
+ * If we're adding an negative cache entry
+ * which covers all types (NXDOMAIN,
+ * NODATA(QTYPE=ANY)),
+ *
+ * We make all other data ancient so that the
+ * only rdataset that can be found at this
+ * node is the negative cache entry.
+ */
+ for (topheader = rbtnode->data;
+ topheader != NULL;
+ topheader = topheader->next)
+ {
+ set_ttl(rbtdb, topheader, 0);
+ mark_header_ancient(rbtdb, topheader);
+ }
+ goto find_header;
+ }
+ /*
+ * Otherwise look for any RRSIGs of the given
+ * type so they can be marked ancient later.
+ */
+ for (topheader = rbtnode->data; topheader != NULL;
+ topheader = topheader->next)
+ {
+ if (topheader->type == sigtype) {
+ sigheader = topheader;
+ }
+ }
+ negtype = RBTDB_RDATATYPE_VALUE(covers, 0);
+ } else {
+ /*
+ * We're adding something that isn't a
+ * negative cache entry. Look for an extant
+ * non-ancient NXDOMAIN/NODATA(QTYPE=ANY) negative
+ * cache entry. If we're adding an RRSIG, also
+ * check for an extant non-ancient NODATA ncache
+ * entry which covers the same type as the RRSIG.
+ */
+ for (topheader = rbtnode->data; topheader != NULL;
+ topheader = topheader->next)
+ {
+ if ((topheader->type ==
+ RBTDB_RDATATYPE_NCACHEANY) ||
+ (newheader->type == sigtype &&
+ topheader->type ==
+ RBTDB_RDATATYPE_VALUE(0, covers)))
+ {
+ break;
+ }
+ }
+ if (topheader != NULL && EXISTS(topheader) &&
+ ACTIVE(topheader, now))
+ {
+ /*
+ * Found one.
+ */
+ if (trust < topheader->trust) {
+ /*
+ * The NXDOMAIN/NODATA(QTYPE=ANY)
+ * is more trusted.
+ */
+ free_rdataset(rbtdb, rbtdb->common.mctx,
+ newheader);
+ if (addedrdataset != NULL) {
+ bind_rdataset(
+ rbtdb, rbtnode,
+ topheader, now,
+ isc_rwlocktype_write,
+ addedrdataset);
+ }
+ return (DNS_R_UNCHANGED);
+ }
+ /*
+ * The new rdataset is better. Expire the
+ * ncache entry.
+ */
+ set_ttl(rbtdb, topheader, 0);
+ mark_header_ancient(rbtdb, topheader);
+ topheader = NULL;
+ goto find_header;
+ }
+ negtype = RBTDB_RDATATYPE_VALUE(0, rdtype);
+ }
+ }
+
+ for (topheader = rbtnode->data; topheader != NULL;
+ topheader = topheader->next)
+ {
+ if (topheader->type == newheader->type ||
+ topheader->type == negtype)
+ {
+ 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) ? true : false;
+
+ /*
+ * Deleting an already non-existent rdataset has no effect.
+ */
+ if (header_nx && newheader_nx) {
+ free_rdataset(rbtdb, 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 the cache data is stale, new lower trust
+ * data will supersede it below. Unclear what the best
+ * policy is here.
+ */
+ if (rbtversion == NULL && trust < header->trust &&
+ (ACTIVE(header, now) || header_nx))
+ {
+ free_rdataset(rbtdb, rbtdb->common.mctx, newheader);
+ if (addedrdataset != NULL) {
+ bind_rdataset(rbtdb, rbtnode, header, now,
+ isc_rwlocktype_write,
+ addedrdataset);
+ }
+ return (DNS_R_UNCHANGED);
+ }
+
+ /*
+ * Don't merge if a nonexistent rdataset is involved.
+ */
+ if (merge && (header_nx || newheader_nx)) {
+ merge = false;
+ }
+
+ /*
+ * If 'merge' is 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;
+ }
+ /*
+ * TTL use here is irrelevant to the cache;
+ * merge is only done with zonedbs.
+ */
+ if ((options & DNS_DBADD_EXACTTTL) != 0 &&
+ newheader->rdh_ttl != header->rdh_ttl)
+ {
+ result = DNS_R_NOTEXACT;
+ } else if (newheader->rdh_ttl != header->rdh_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, rbtdb->common.mctx,
+ newheader);
+ newheader = (rdatasetheader_t *)merged;
+ init_rdataset(rbtdb, newheader);
+ update_newheader(newheader, header);
+ if (loading && RESIGN(newheader) &&
+ RESIGN(header) &&
+ resign_sooner(header, newheader))
+ {
+ newheader->resign = header->resign;
+ newheader->resign_lsb =
+ header->resign_lsb;
+ }
+ } else {
+ free_rdataset(rbtdb, 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. Nothing
+ * special to be done w.r.t stale data; it gets replaced
+ * normally further down.
+ */
+ if (IS_CACHE(rbtdb) && ACTIVE(header, 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->rdh_ttl > newheader->rdh_ttl) {
+ set_ttl(rbtdb, header, newheader->rdh_ttl);
+ }
+ if (header->noqname == NULL &&
+ newheader->noqname != NULL)
+ {
+ header->noqname = newheader->noqname;
+ newheader->noqname = NULL;
+ }
+ if (header->closest == NULL &&
+ newheader->closest != NULL)
+ {
+ header->closest = newheader->closest;
+ newheader->closest = NULL;
+ }
+ free_rdataset(rbtdb, rbtdb->common.mctx, newheader);
+ if (addedrdataset != NULL) {
+ bind_rdataset(rbtdb, rbtnode, header, now,
+ isc_rwlocktype_write,
+ addedrdataset);
+ }
+ return (ISC_R_SUCCESS);
+ }
+ /*
+ * If we have will be replacing a NS RRset force its TTL
+ * to be no more than the current NS RRset's TTL. This
+ * ensures the delegations that are withdrawn are honoured.
+ */
+ if (IS_CACHE(rbtdb) && ACTIVE(header, now) &&
+ header->type == dns_rdatatype_ns && !header_nx &&
+ !newheader_nx && header->trust <= newheader->trust)
+ {
+ if (newheader->rdh_ttl > header->rdh_ttl) {
+ newheader->rdh_ttl = header->rdh_ttl;
+ }
+ }
+ if (IS_CACHE(rbtdb) && ACTIVE(header, now) &&
+ (options & DNS_DBADD_PREFETCH) == 0 &&
+ (header->type == dns_rdatatype_a ||
+ header->type == dns_rdatatype_aaaa ||
+ header->type == dns_rdatatype_ds ||
+ header->type == RBTDB_RDATATYPE_SIGDS) &&
+ !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->rdh_ttl > newheader->rdh_ttl) {
+ set_ttl(rbtdb, header, newheader->rdh_ttl);
+ }
+ if (header->noqname == NULL &&
+ newheader->noqname != NULL)
+ {
+ header->noqname = newheader->noqname;
+ newheader->noqname = NULL;
+ }
+ if (header->closest == NULL &&
+ newheader->closest != NULL)
+ {
+ header->closest = newheader->closest;
+ newheader->closest = NULL;
+ }
+ free_rdataset(rbtdb, rbtdb->common.mctx, newheader);
+ if (addedrdataset != NULL) {
+ bind_rdataset(rbtdb, rbtnode, header, now,
+ isc_rwlocktype_write,
+ addedrdataset);
+ }
+ return (ISC_R_SUCCESS);
+ }
+ INSIST(rbtversion == NULL ||
+ rbtversion->serial >= topheader->serial);
+ if (loading) {
+ newheader->down = NULL;
+ idx = newheader->node->locknum;
+ if (IS_CACHE(rbtdb)) {
+ if (ZEROTTL(newheader)) {
+ ISC_LIST_APPEND(rbtdb->rdatasets[idx],
+ newheader, link);
+ } else {
+ ISC_LIST_PREPEND(rbtdb->rdatasets[idx],
+ newheader, link);
+ }
+ INSIST(rbtdb->heaps != NULL);
+ isc_heap_insert(rbtdb->heaps[idx], newheader);
+ } else if (RESIGN(newheader)) {
+ resign_insert(rbtdb, idx, newheader);
+ /*
+ * Don't call resign_delete as we don't need
+ * to reverse the delete. The free_rdataset
+ * call below will clean up the heap entry.
+ */
+ }
+
+ /*
+ * 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.
+ */
+ if (topheader_prev != NULL) {
+ topheader_prev->next = newheader;
+ } else {
+ rbtnode->data = newheader;
+ }
+ newheader->next = topheader->next;
+ if (rbtversion != NULL && !header_nx) {
+ update_recordsandxfrsize(false, rbtversion,
+ header,
+ nodename->length);
+ }
+ free_rdataset(rbtdb, rbtdb->common.mctx, header);
+ } else {
+ idx = newheader->node->locknum;
+ if (IS_CACHE(rbtdb)) {
+ INSIST(rbtdb->heaps != NULL);
+ isc_heap_insert(rbtdb->heaps[idx], newheader);
+ if (ZEROTTL(newheader)) {
+ ISC_LIST_APPEND(rbtdb->rdatasets[idx],
+ newheader, link);
+ } else {
+ ISC_LIST_PREPEND(rbtdb->rdatasets[idx],
+ newheader, link);
+ }
+ } else if (RESIGN(newheader)) {
+ resign_insert(rbtdb, idx, newheader);
+ resign_delete(rbtdb, rbtversion, header);
+ }
+ 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 = true;
+ }
+ if (rbtversion == NULL) {
+ set_ttl(rbtdb, header, 0);
+ mark_header_ancient(rbtdb, header);
+ if (sigheader != NULL) {
+ set_ttl(rbtdb, sigheader, 0);
+ mark_header_ancient(rbtdb, sigheader);
+ }
+ }
+ if (rbtversion != NULL && !header_nx) {
+ update_recordsandxfrsize(false, rbtversion,
+ header,
+ nodename->length);
+ }
+ }
+ } 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, rbtdb->common.mctx, newheader);
+ return (DNS_R_UNCHANGED);
+ }
+
+ idx = newheader->node->locknum;
+ if (IS_CACHE(rbtdb)) {
+ isc_heap_insert(rbtdb->heaps[idx], newheader);
+ if (ZEROTTL(newheader)) {
+ ISC_LIST_APPEND(rbtdb->rdatasets[idx],
+ newheader, link);
+ } else {
+ ISC_LIST_PREPEND(rbtdb->rdatasets[idx],
+ newheader, link);
+ }
+ } else if (RESIGN(newheader)) {
+ resign_insert(rbtdb, idx, newheader);
+ resign_delete(rbtdb, rbtversion, header);
+ }
+
+ 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 = true;
+ }
+ } else {
+ /*
+ * No rdatasets of the given type exist at the node.
+ */
+ newheader->next = rbtnode->data;
+ newheader->down = NULL;
+ rbtnode->data = newheader;
+ }
+ }
+
+ if (rbtversion != NULL && !newheader_nx) {
+ update_recordsandxfrsize(true, rbtversion, newheader,
+ nodename->length);
+ }
+
+ /*
+ * 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,
+ isc_rwlocktype_write, addedrdataset);
+ }
+
+ return (ISC_R_SUCCESS);
+}
+
+static bool
+delegating_type(dns_rbtdb_t *rbtdb, dns_rbtnode_t *node,
+ rbtdb_rdatatype_t type) {
+ if (IS_CACHE(rbtdb)) {
+ if (type == dns_rdatatype_dname) {
+ return (true);
+ } else {
+ return (false);
+ }
+ } else if (type == dns_rdatatype_dname ||
+ (type == dns_rdatatype_ns &&
+ (node != rbtdb->origin_node || IS_STUB(rbtdb))))
+ {
+ return (true);
+ }
+ return (false);
+}
+
+static 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 neg, negsig;
+ isc_result_t result;
+ isc_region_t r;
+
+ dns_name_init(&name, NULL);
+ dns_rdataset_init(&neg);
+ dns_rdataset_init(&negsig);
+
+ result = dns_rdataset_getnoqname(rdataset, &name, &neg, &negsig);
+ RUNTIME_CHECK(result == ISC_R_SUCCESS);
+
+ noqname = isc_mem_get(mctx, sizeof(*noqname));
+ dns_name_init(&noqname->name, NULL);
+ noqname->neg = NULL;
+ noqname->negsig = NULL;
+ noqname->type = neg.type;
+ dns_name_dup(&name, mctx, &noqname->name);
+ result = dns_rdataslab_fromrdataset(&neg, mctx, &r, 0);
+ if (result != ISC_R_SUCCESS) {
+ goto cleanup;
+ }
+ noqname->neg = r.base;
+ result = dns_rdataslab_fromrdataset(&negsig, mctx, &r, 0);
+ if (result != ISC_R_SUCCESS) {
+ goto cleanup;
+ }
+ noqname->negsig = r.base;
+ dns_rdataset_disassociate(&neg);
+ dns_rdataset_disassociate(&negsig);
+ newheader->noqname = noqname;
+ return (ISC_R_SUCCESS);
+
+cleanup:
+ dns_rdataset_disassociate(&neg);
+ dns_rdataset_disassociate(&negsig);
+ free_noqname(mctx, &noqname);
+ return (result);
+}
+
+static isc_result_t
+addclosest(dns_rbtdb_t *rbtdb, rdatasetheader_t *newheader,
+ dns_rdataset_t *rdataset) {
+ struct noqname *closest;
+ isc_mem_t *mctx = rbtdb->common.mctx;
+ dns_name_t name;
+ dns_rdataset_t neg, negsig;
+ isc_result_t result;
+ isc_region_t r;
+
+ dns_name_init(&name, NULL);
+ dns_rdataset_init(&neg);
+ dns_rdataset_init(&negsig);
+
+ result = dns_rdataset_getclosest(rdataset, &name, &neg, &negsig);
+ RUNTIME_CHECK(result == ISC_R_SUCCESS);
+
+ closest = isc_mem_get(mctx, sizeof(*closest));
+ dns_name_init(&closest->name, NULL);
+ closest->neg = NULL;
+ closest->negsig = NULL;
+ closest->type = neg.type;
+ dns_name_dup(&name, mctx, &closest->name);
+ result = dns_rdataslab_fromrdataset(&neg, mctx, &r, 0);
+ if (result != ISC_R_SUCCESS) {
+ goto cleanup;
+ }
+ closest->neg = r.base;
+ result = dns_rdataslab_fromrdataset(&negsig, mctx, &r, 0);
+ if (result != ISC_R_SUCCESS) {
+ goto cleanup;
+ }
+ closest->negsig = r.base;
+ dns_rdataset_disassociate(&neg);
+ dns_rdataset_disassociate(&negsig);
+ newheader->closest = closest;
+ return (ISC_R_SUCCESS);
+
+cleanup:
+ dns_rdataset_disassociate(&neg);
+ dns_rdataset_disassociate(&negsig);
+ free_noqname(mctx, &closest);
+ return (result);
+}
+
+static dns_dbmethods_t zone_methods;
+
+static size_t
+rdataset_size(rdatasetheader_t *header) {
+ if (!NONEXISTENT(header)) {
+ return (dns_rdataslab_size((unsigned char *)header,
+ sizeof(*header)));
+ }
+
+ return (sizeof(*header));
+}
+
+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;
+ rdatasetheader_t *header;
+ isc_result_t result;
+ bool delegating;
+ bool newnsec;
+ bool tree_locked = false;
+ bool cache_is_overmem = false;
+ dns_fixedname_t fixed;
+ dns_name_t *name;
+
+ REQUIRE(VALID_RBTDB(rbtdb));
+ INSIST(rbtversion == NULL || rbtversion->rbtdb == rbtdb);
+
+ if (rbtdb->common.methods == &zone_methods) {
+ /*
+ * SOA records are only allowed at top of zone.
+ */
+ if (rdataset->type == dns_rdatatype_soa &&
+ node != rbtdb->origin_node)
+ {
+ return (DNS_R_NOTZONETOP);
+ }
+ RWLOCK(&rbtdb->tree_lock, isc_rwlocktype_read);
+ REQUIRE(((rbtnode->nsec == DNS_RBT_NSEC_NSEC3 &&
+ (rdataset->type == dns_rdatatype_nsec3 ||
+ rdataset->covers == dns_rdatatype_nsec3)) ||
+ (rbtnode->nsec != DNS_RBT_NSEC_NSEC3 &&
+ rdataset->type != dns_rdatatype_nsec3 &&
+ rdataset->covers != dns_rdatatype_nsec3)));
+ RWUNLOCK(&rbtdb->tree_lock, isc_rwlocktype_read);
+ }
+
+ if (rbtversion == NULL) {
+ if (now == 0) {
+ isc_stdtime_get(&now);
+ }
+ } else {
+ now = 0;
+ }
+
+ result = dns_rdataslab_fromrdataset(rdataset, rbtdb->common.mctx,
+ &region, sizeof(rdatasetheader_t));
+ if (result != ISC_R_SUCCESS) {
+ return (result);
+ }
+
+ name = dns_fixedname_initname(&fixed);
+ nodefullname(db, node, name);
+ dns_rdataset_getownercase(rdataset, name);
+
+ newheader = (rdatasetheader_t *)region.base;
+ init_rdataset(rbtdb, newheader);
+ setownercase(newheader, name);
+ set_ttl(rbtdb, newheader, rdataset->ttl + now);
+ newheader->type = RBTDB_RDATATYPE_VALUE(rdataset->type,
+ rdataset->covers);
+ atomic_init(&newheader->attributes, 0);
+ if (rdataset->ttl == 0U) {
+ RDATASET_ATTR_SET(newheader, RDATASET_ATTR_ZEROTTL);
+ }
+ newheader->noqname = NULL;
+ newheader->closest = NULL;
+ atomic_init(&newheader->count,
+ atomic_fetch_add_relaxed(&init_count, 1));
+ newheader->trust = rdataset->trust;
+ newheader->last_used = now;
+ newheader->node = rbtnode;
+ if (rbtversion != NULL) {
+ newheader->serial = rbtversion->serial;
+ now = 0;
+
+ if ((rdataset->attributes & DNS_RDATASETATTR_RESIGN) != 0) {
+ RDATASET_ATTR_SET(newheader, RDATASET_ATTR_RESIGN);
+ newheader->resign =
+ (isc_stdtime_t)(dns_time64_from32(
+ rdataset->resign) >>
+ 1);
+ newheader->resign_lsb = rdataset->resign & 0x1;
+ } else {
+ newheader->resign = 0;
+ newheader->resign_lsb = 0;
+ }
+ } else {
+ newheader->serial = 1;
+ newheader->resign = 0;
+ newheader->resign_lsb = 0;
+ if ((rdataset->attributes & DNS_RDATASETATTR_PREFETCH) != 0) {
+ RDATASET_ATTR_SET(newheader, RDATASET_ATTR_PREFETCH);
+ }
+ if ((rdataset->attributes & DNS_RDATASETATTR_NEGATIVE) != 0) {
+ RDATASET_ATTR_SET(newheader, RDATASET_ATTR_NEGATIVE);
+ }
+ if ((rdataset->attributes & DNS_RDATASETATTR_NXDOMAIN) != 0) {
+ RDATASET_ATTR_SET(newheader, RDATASET_ATTR_NXDOMAIN);
+ }
+ if ((rdataset->attributes & DNS_RDATASETATTR_OPTOUT) != 0) {
+ RDATASET_ATTR_SET(newheader, RDATASET_ATTR_OPTOUT);
+ }
+ if ((rdataset->attributes & DNS_RDATASETATTR_NOQNAME) != 0) {
+ result = addnoqname(rbtdb, newheader, rdataset);
+ if (result != ISC_R_SUCCESS) {
+ free_rdataset(rbtdb, rbtdb->common.mctx,
+ newheader);
+ return (result);
+ }
+ }
+ if ((rdataset->attributes & DNS_RDATASETATTR_CLOSEST) != 0) {
+ result = addclosest(rbtdb, newheader, rdataset);
+ if (result != ISC_R_SUCCESS) {
+ free_rdataset(rbtdb, 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.
+ */
+ if (delegating_type(rbtdb, rbtnode, rdataset->type)) {
+ delegating = true;
+ } else {
+ delegating = false;
+ }
+
+ /*
+ * Add to the auxiliary NSEC tree if we're adding an NSEC record.
+ */
+ RWLOCK(&rbtdb->tree_lock, isc_rwlocktype_read);
+ if (rbtnode->nsec != DNS_RBT_NSEC_HAS_NSEC &&
+ rdataset->type == dns_rdatatype_nsec)
+ {
+ newnsec = true;
+ } else {
+ newnsec = false;
+ }
+ RWUNLOCK(&rbtdb->tree_lock, isc_rwlocktype_read);
+
+ /*
+ * If we're adding a delegation type, adding to the auxiliary NSEC
+ * tree, or the DB is a cache in an overmem state, hold an
+ * exclusive lock on the tree. In the latter case the lock does
+ * not necessarily have to be acquired but it will help purge
+ * ancient entries more effectively.
+ */
+ if (IS_CACHE(rbtdb) && isc_mem_isovermem(rbtdb->common.mctx)) {
+ cache_is_overmem = true;
+ }
+ if (delegating || newnsec || cache_is_overmem) {
+ tree_locked = true;
+ RWLOCK(&rbtdb->tree_lock, isc_rwlocktype_write);
+ }
+
+ if (cache_is_overmem) {
+ overmem_purge(rbtdb, rbtnode->locknum, rdataset_size(newheader),
+ tree_locked);
+ }
+
+ NODE_LOCK(&rbtdb->node_locks[rbtnode->locknum].lock,
+ isc_rwlocktype_write);
+
+ if (rbtdb->rrsetstats != NULL) {
+ RDATASET_ATTR_SET(newheader, RDATASET_ATTR_STATCOUNT);
+ update_rrsetstats(rbtdb, newheader->type,
+ atomic_load_acquire(&newheader->attributes),
+ true);
+ }
+
+ if (IS_CACHE(rbtdb)) {
+ if (tree_locked) {
+ cleanup_dead_nodes(rbtdb, rbtnode->locknum);
+ }
+
+ header = isc_heap_element(rbtdb->heaps[rbtnode->locknum], 1);
+ if (header != NULL) {
+ dns_ttl_t rdh_ttl = header->rdh_ttl;
+
+ /* Only account for stale TTL if cache is not overmem */
+ if (!cache_is_overmem) {
+ rdh_ttl += rbtdb->serve_stale_ttl;
+ }
+
+ if (rdh_ttl < now - RBTDB_VIRTUAL) {
+ expire_header(rbtdb, header, tree_locked,
+ expire_ttl);
+ }
+ }
+
+ /*
+ * If we've been holding a write lock on the tree just for
+ * cleaning, we can release it now. However, we still need the
+ * node lock.
+ */
+ if (tree_locked && !delegating && !newnsec) {
+ RWUNLOCK(&rbtdb->tree_lock, isc_rwlocktype_write);
+ tree_locked = false;
+ }
+ }
+
+ result = ISC_R_SUCCESS;
+ if (newnsec) {
+ dns_rbtnode_t *nsecnode;
+
+ nsecnode = NULL;
+ result = dns_rbt_addnode(rbtdb->nsec, name, &nsecnode);
+ if (result == ISC_R_SUCCESS) {
+ nsecnode->nsec = DNS_RBT_NSEC_NSEC;
+ rbtnode->nsec = DNS_RBT_NSEC_HAS_NSEC;
+ } else if (result == ISC_R_EXISTS) {
+ rbtnode->nsec = DNS_RBT_NSEC_HAS_NSEC;
+ result = ISC_R_SUCCESS;
+ }
+ }
+
+ if (result == ISC_R_SUCCESS) {
+ result = add32(rbtdb, rbtnode, name, rbtversion, newheader,
+ options, false, addedrdataset, now);
+ }
+ if (result == ISC_R_SUCCESS && delegating) {
+ rbtnode->find_callback = 1;
+ }
+
+ NODE_UNLOCK(&rbtdb->node_locks[rbtnode->locknum].lock,
+ isc_rwlocktype_write);
+
+ if (tree_locked) {
+ RWUNLOCK(&rbtdb->tree_lock, isc_rwlocktype_write);
+ }
+
+ /*
+ * Update the zone's secure status. If version is non-NULL
+ * this is deferred until closeversion() is called.
+ */
+ if (result == ISC_R_SUCCESS && version == NULL && !IS_CACHE(rbtdb)) {
+ iszonesecure(db, version, rbtdb->origin_node);
+ }
+
+ 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;
+ dns_fixedname_t fname;
+ dns_name_t *nodename = dns_fixedname_initname(&fname);
+ 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));
+ REQUIRE(rbtversion != NULL && rbtversion->rbtdb == rbtdb);
+
+ if (rbtdb->common.methods == &zone_methods) {
+ RWLOCK(&rbtdb->tree_lock, isc_rwlocktype_read);
+ REQUIRE(((rbtnode->nsec == DNS_RBT_NSEC_NSEC3 &&
+ (rdataset->type == dns_rdatatype_nsec3 ||
+ rdataset->covers == dns_rdatatype_nsec3)) ||
+ (rbtnode->nsec != DNS_RBT_NSEC_NSEC3 &&
+ rdataset->type != dns_rdatatype_nsec3 &&
+ rdataset->covers != dns_rdatatype_nsec3)));
+ RWUNLOCK(&rbtdb->tree_lock, isc_rwlocktype_read);
+ }
+
+ nodefullname(db, node, nodename);
+
+ result = dns_rdataslab_fromrdataset(rdataset, rbtdb->common.mctx,
+ &region, sizeof(rdatasetheader_t));
+ if (result != ISC_R_SUCCESS) {
+ return (result);
+ }
+ newheader = (rdatasetheader_t *)region.base;
+ init_rdataset(rbtdb, newheader);
+ set_ttl(rbtdb, newheader, rdataset->ttl);
+ newheader->type = RBTDB_RDATATYPE_VALUE(rdataset->type,
+ rdataset->covers);
+ atomic_init(&newheader->attributes, 0);
+ newheader->serial = rbtversion->serial;
+ newheader->trust = 0;
+ newheader->noqname = NULL;
+ newheader->closest = NULL;
+ atomic_init(&newheader->count,
+ atomic_fetch_add_relaxed(&init_count, 1));
+ newheader->last_used = 0;
+ newheader->node = rbtnode;
+ if ((rdataset->attributes & DNS_RDATASETATTR_RESIGN) != 0) {
+ RDATASET_ATTR_SET(newheader, RDATASET_ATTR_RESIGN);
+ newheader->resign =
+ (isc_stdtime_t)(dns_time64_from32(rdataset->resign) >>
+ 1);
+ newheader->resign_lsb = rdataset->resign & 0x1;
+ } else {
+ newheader->resign = 0;
+ newheader->resign_lsb = 0;
+ }
+
+ NODE_LOCK(&rbtdb->node_locks[rbtnode->locknum].lock,
+ isc_rwlocktype_write);
+
+ changed = add_changed(rbtdb, rbtversion, rbtnode);
+ if (changed == NULL) {
+ free_rdataset(rbtdb, rbtdb->common.mctx, newheader);
+ NODE_UNLOCK(&rbtdb->node_locks[rbtnode->locknum].lock,
+ isc_rwlocktype_write);
+ 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->rdh_ttl != header->rdh_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, rbtdb->common.mctx, newheader);
+ newheader = (rdatasetheader_t *)subresult;
+ init_rdataset(rbtdb, newheader);
+ update_newheader(newheader, header);
+ if (RESIGN(header)) {
+ RDATASET_ATTR_SET(newheader,
+ RDATASET_ATTR_RESIGN);
+ newheader->resign = header->resign;
+ newheader->resign_lsb = header->resign_lsb;
+ resign_insert(rbtdb, rbtnode->locknum,
+ newheader);
+ }
+ /*
+ * We have to set the serial since the rdataslab
+ * subtraction routine copies the reserved portion of
+ * header, not newheader.
+ */
+ newheader->serial = rbtversion->serial;
+ /*
+ * XXXJT: dns_rdataslab_subtract() copied the pointers
+ * to additional info. We need to clear these fields
+ * to avoid having duplicated references.
+ */
+ update_recordsandxfrsize(true, rbtversion, newheader,
+ nodename->length);
+ } else if (result == DNS_R_NXRRSET) {
+ /*
+ * This subtraction would remove all of the rdata;
+ * add a nonexistent header instead.
+ */
+ free_rdataset(rbtdb, rbtdb->common.mctx, newheader);
+ newheader = new_rdataset(rbtdb, rbtdb->common.mctx);
+ if (newheader == NULL) {
+ result = ISC_R_NOMEMORY;
+ goto unlock;
+ }
+ init_rdataset(rbtdb, newheader);
+ set_ttl(rbtdb, newheader, 0);
+ newheader->type = topheader->type;
+ atomic_init(&newheader->attributes,
+ RDATASET_ATTR_NONEXISTENT);
+ newheader->trust = 0;
+ newheader->serial = rbtversion->serial;
+ newheader->noqname = NULL;
+ newheader->closest = NULL;
+ atomic_init(&newheader->count, 0);
+ newheader->node = rbtnode;
+ newheader->resign = 0;
+ newheader->resign_lsb = 0;
+ newheader->last_used = 0;
+ } else {
+ free_rdataset(rbtdb, rbtdb->common.mctx, newheader);
+ goto unlock;
+ }
+
+ /*
+ * If we're here, we want to link newheader in front of
+ * topheader.
+ */
+ INSIST(rbtversion->serial >= topheader->serial);
+ update_recordsandxfrsize(false, rbtversion, header,
+ nodename->length);
+ 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 = true;
+ resign_delete(rbtdb, rbtversion, header);
+ } else {
+ /*
+ * The rdataset doesn't exist, so we don't need to do anything
+ * to satisfy the deletion request.
+ */
+ free_rdataset(rbtdb, 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,
+ isc_rwlocktype_write, newrdataset);
+ }
+
+ if (result == DNS_R_NXRRSET && newrdataset != NULL &&
+ (options & DNS_DBSUB_WANTOLD) != 0)
+ {
+ bind_rdataset(rbtdb, rbtnode, header, 0, isc_rwlocktype_write,
+ newrdataset);
+ }
+
+unlock:
+ NODE_UNLOCK(&rbtdb->node_locks[rbtnode->locknum].lock,
+ isc_rwlocktype_write);
+
+ /*
+ * Update the zone's secure status. If version is non-NULL
+ * this is deferred until closeversion() is called.
+ */
+ if (result == ISC_R_SUCCESS && version == NULL && !IS_CACHE(rbtdb)) {
+ RBTDB_LOCK(&rbtdb->lock, isc_rwlocktype_read);
+ version = rbtdb->current_version;
+ RBTDB_UNLOCK(&rbtdb->lock, isc_rwlocktype_read);
+ iszonesecure(db, version, rbtdb->origin_node);
+ }
+
+ 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;
+ dns_fixedname_t fname;
+ dns_name_t *nodename = dns_fixedname_initname(&fname);
+ isc_result_t result;
+ rdatasetheader_t *newheader;
+
+ REQUIRE(VALID_RBTDB(rbtdb));
+ INSIST(rbtversion == NULL || rbtversion->rbtdb == rbtdb);
+
+ if (type == dns_rdatatype_any) {
+ return (ISC_R_NOTIMPLEMENTED);
+ }
+ if (type == dns_rdatatype_rrsig && covers == 0) {
+ return (ISC_R_NOTIMPLEMENTED);
+ }
+
+ newheader = new_rdataset(rbtdb, rbtdb->common.mctx);
+ if (newheader == NULL) {
+ return (ISC_R_NOMEMORY);
+ }
+ init_rdataset(rbtdb, newheader);
+ set_ttl(rbtdb, newheader, 0);
+ newheader->type = RBTDB_RDATATYPE_VALUE(type, covers);
+ atomic_init(&newheader->attributes, RDATASET_ATTR_NONEXISTENT);
+ newheader->trust = 0;
+ newheader->noqname = NULL;
+ newheader->closest = NULL;
+ if (rbtversion != NULL) {
+ newheader->serial = rbtversion->serial;
+ } else {
+ newheader->serial = 0;
+ }
+ atomic_init(&newheader->count, 0);
+ newheader->last_used = 0;
+ newheader->node = rbtnode;
+
+ nodefullname(db, node, nodename);
+
+ NODE_LOCK(&rbtdb->node_locks[rbtnode->locknum].lock,
+ isc_rwlocktype_write);
+ result = add32(rbtdb, rbtnode, nodename, rbtversion, newheader,
+ DNS_DBADD_FORCE, false, NULL, 0);
+ NODE_UNLOCK(&rbtdb->node_locks[rbtnode->locknum].lock,
+ isc_rwlocktype_write);
+
+ /*
+ * Update the zone's secure status. If version is non-NULL
+ * this is deferred until closeversion() is called.
+ */
+ if (result == ISC_R_SUCCESS && version == NULL && !IS_CACHE(rbtdb)) {
+ RBTDB_LOCK(&rbtdb->lock, isc_rwlocktype_read);
+ version = rbtdb->current_version;
+ RBTDB_UNLOCK(&rbtdb->lock, isc_rwlocktype_read);
+ iszonesecure(db, version, rbtdb->origin_node);
+ }
+
+ return (result);
+}
+
+/*
+ * load a non-NSEC3 node in the main tree and optionally to the auxiliary NSEC
+ */
+static isc_result_t
+loadnode(dns_rbtdb_t *rbtdb, const dns_name_t *name, dns_rbtnode_t **nodep,
+ bool hasnsec) {
+ isc_result_t noderesult, nsecresult, tmpresult;
+ dns_rbtnode_t *nsecnode = NULL, *node = NULL;
+
+ noderesult = dns_rbt_addnode(rbtdb->tree, name, &node);
+ if (!hasnsec) {
+ goto done;
+ }
+ if (noderesult == ISC_R_EXISTS) {
+ /*
+ * Add a node to the auxiliary NSEC tree for an old node
+ * just now getting an NSEC record.
+ */
+ if (node->nsec == DNS_RBT_NSEC_HAS_NSEC) {
+ goto done;
+ }
+ } else if (noderesult != ISC_R_SUCCESS) {
+ goto done;
+ }
+
+ /*
+ * Build the auxiliary tree for NSECs as we go.
+ * This tree speeds searches for closest NSECs that would otherwise
+ * need to examine many irrelevant nodes in large TLDs.
+ *
+ * Add nodes to the auxiliary tree after corresponding nodes have
+ * been added to the main tree.
+ */
+ nsecresult = dns_rbt_addnode(rbtdb->nsec, name, &nsecnode);
+ if (nsecresult == ISC_R_SUCCESS) {
+ nsecnode->nsec = DNS_RBT_NSEC_NSEC;
+ node->nsec = DNS_RBT_NSEC_HAS_NSEC;
+ goto done;
+ }
+
+ if (nsecresult == ISC_R_EXISTS) {
+#if 1 /* 0 */
+ isc_log_write(dns_lctx, DNS_LOGCATEGORY_DATABASE,
+ DNS_LOGMODULE_CACHE, ISC_LOG_WARNING,
+ "addnode: NSEC node already exists");
+#endif /* if 1 */
+ node->nsec = DNS_RBT_NSEC_HAS_NSEC;
+ goto done;
+ }
+
+ if (noderesult == ISC_R_SUCCESS) {
+ /*
+ * Remove the node we just added above.
+ */
+ tmpresult = dns_rbt_deletenode(rbtdb->tree, node, false);
+ if (tmpresult != ISC_R_SUCCESS) {
+ isc_log_write(dns_lctx, DNS_LOGCATEGORY_DATABASE,
+ DNS_LOGMODULE_CACHE, ISC_LOG_WARNING,
+ "loading_addrdataset: "
+ "dns_rbt_deletenode: %s after "
+ "dns_rbt_addnode(NSEC): %s",
+ isc_result_totext(tmpresult),
+ isc_result_totext(noderesult));
+ }
+ }
+
+ /*
+ * Set the error condition to be returned.
+ */
+ noderesult = nsecresult;
+
+done:
+ if (noderesult == ISC_R_SUCCESS || noderesult == ISC_R_EXISTS) {
+ *nodep = node;
+ }
+
+ return (noderesult);
+}
+
+static isc_result_t
+loading_addrdataset(void *arg, const 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;
+
+ REQUIRE(rdataset->rdclass == rbtdb->common.rdclass);
+
+ /*
+ * 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);
+ }
+
+ if (rdataset->type != dns_rdatatype_nsec3 &&
+ rdataset->covers != dns_rdatatype_nsec3)
+ {
+ add_empty_wildcards(rbtdb, name, false);
+ }
+
+ if (dns_name_iswildcard(name)) {
+ /*
+ * NS record owners cannot legally be wild cards.
+ */
+ if (rdataset->type == dns_rdatatype_ns) {
+ return (DNS_R_INVALIDNS);
+ }
+ /*
+ * NSEC3 record owners cannot legally be wild cards.
+ */
+ if (rdataset->type == dns_rdatatype_nsec3) {
+ return (DNS_R_INVALIDNSEC3);
+ }
+ result = add_wildcard_magic(rbtdb, name, false);
+ if (result != ISC_R_SUCCESS) {
+ return (result);
+ }
+ }
+
+ node = NULL;
+ if (rdataset->type == dns_rdatatype_nsec3 ||
+ rdataset->covers == dns_rdatatype_nsec3)
+ {
+ result = dns_rbt_addnode(rbtdb->nsec3, name, &node);
+ if (result == ISC_R_SUCCESS) {
+ node->nsec = DNS_RBT_NSEC_NSEC3;
+ }
+ } else if (rdataset->type == dns_rdatatype_nsec) {
+ result = loadnode(rbtdb, name, &node, true);
+ } else {
+ result = loadnode(rbtdb, name, &node, false);
+ }
+ if (result != ISC_R_SUCCESS && result != ISC_R_EXISTS) {
+ return (result);
+ }
+ if (result == ISC_R_SUCCESS) {
+ node->locknum = node->hashval % rbtdb->node_lock_count;
+ }
+
+ result = dns_rdataslab_fromrdataset(rdataset, rbtdb->common.mctx,
+ &region, sizeof(rdatasetheader_t));
+ if (result != ISC_R_SUCCESS) {
+ return (result);
+ }
+ newheader = (rdatasetheader_t *)region.base;
+ init_rdataset(rbtdb, newheader);
+ set_ttl(rbtdb, newheader, rdataset->ttl + loadctx->now); /* XXX overflow
+ * check */
+ newheader->type = RBTDB_RDATATYPE_VALUE(rdataset->type,
+ rdataset->covers);
+ atomic_init(&newheader->attributes, 0);
+ newheader->trust = rdataset->trust;
+ newheader->serial = 1;
+ newheader->noqname = NULL;
+ newheader->closest = NULL;
+ atomic_init(&newheader->count,
+ atomic_fetch_add_relaxed(&init_count, 1));
+ newheader->last_used = 0;
+ newheader->node = node;
+ setownercase(newheader, name);
+
+ if ((rdataset->attributes & DNS_RDATASETATTR_RESIGN) != 0) {
+ RDATASET_ATTR_SET(newheader, RDATASET_ATTR_RESIGN);
+ newheader->resign =
+ (isc_stdtime_t)(dns_time64_from32(rdataset->resign) >>
+ 1);
+ newheader->resign_lsb = rdataset->resign & 0x1;
+ } else {
+ newheader->resign = 0;
+ newheader->resign_lsb = 0;
+ }
+
+ NODE_LOCK(&rbtdb->node_locks[node->locknum].lock, isc_rwlocktype_write);
+ result = add32(rbtdb, node, name, rbtdb->current_version, newheader,
+ DNS_DBADD_MERGE, true, NULL, 0);
+ NODE_UNLOCK(&rbtdb->node_locks[node->locknum].lock,
+ isc_rwlocktype_write);
+
+ 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
+rbt_datafixer(dns_rbtnode_t *rbtnode, void *base, size_t filesize, void *arg,
+ uint64_t *crc) {
+ dns_rbtdb_t *rbtdb = (dns_rbtdb_t *)arg;
+ rdatasetheader_t *header;
+ unsigned char *limit = ((unsigned char *)base) + filesize;
+
+ REQUIRE(rbtnode != NULL);
+ REQUIRE(VALID_RBTDB(rbtdb));
+
+ for (header = rbtnode->data; header != NULL; header = header->next) {
+ unsigned char *p = (unsigned char *)header;
+ size_t size = dns_rdataslab_size(p, sizeof(*header));
+ isc_crc64_update(crc, p, size);
+#ifdef DEBUG
+ hexdump("hashing header", p, sizeof(rdatasetheader_t));
+ hexdump("hashing slab", p + sizeof(rdatasetheader_t),
+ size - sizeof(rdatasetheader_t));
+#endif /* ifdef DEBUG */
+ header->serial = 1;
+ header->is_mmapped = 1;
+ header->node = rbtnode;
+ header->node_is_relative = 0;
+
+ if (RESIGN(header) &&
+ (header->resign != 0 || header->resign_lsb != 0))
+ {
+ int idx = header->node->locknum;
+ isc_heap_insert(rbtdb->heaps[idx], header);
+ }
+
+ if (header->next != NULL) {
+ size_t cooked = dns_rbt_serialize_align(size);
+ if ((uintptr_t)header->next !=
+ (p - (unsigned char *)base) + cooked)
+ {
+ return (ISC_R_INVALIDFILE);
+ }
+ header->next = (rdatasetheader_t *)(p + cooked);
+ header->next_is_relative = 0;
+ if ((header->next < (rdatasetheader_t *)base) ||
+ (header->next > (rdatasetheader_t *)limit))
+ {
+ return (ISC_R_INVALIDFILE);
+ }
+ }
+
+ update_recordsandxfrsize(true, rbtdb->current_version, header,
+ rbtnode->fullnamelen);
+ }
+
+ /* We're done deserializing; clear fullnamelen */
+ rbtnode->fullnamelen = 0;
+
+ return (ISC_R_SUCCESS);
+}
+
+/*
+ * Load the RBT database from the image in 'f'
+ */
+static isc_result_t
+deserialize(void *arg, FILE *f, off_t offset) {
+ isc_result_t result;
+ rbtdb_load_t *loadctx = arg;
+ dns_rbtdb_t *rbtdb = loadctx->rbtdb;
+ rbtdb_file_header_t *header;
+ int fd;
+ off_t filesize = 0;
+ char *base;
+ dns_rbt_t *tree = NULL, *nsec = NULL, *nsec3 = NULL;
+ int protect, flags;
+ dns_rbtnode_t *origin_node = NULL;
+
+ REQUIRE(VALID_RBTDB(rbtdb));
+
+ /*
+ * TODO CKB: since this is read-write (had to be to add nodes later)
+ * we will need to lock the file or the nodes in it before modifying
+ * the nodes in the file.
+ */
+
+ /* Map in the whole file in one go */
+ fd = fileno(f);
+ isc_file_getsizefd(fd, &filesize);
+ protect = PROT_READ | PROT_WRITE;
+ flags = MAP_PRIVATE;
+#ifdef MAP_FILE
+ flags |= MAP_FILE;
+#endif /* ifdef MAP_FILE */
+
+ base = isc_file_mmap(NULL, filesize, protect, flags, fd, 0);
+ if (base == NULL || base == MAP_FAILED) {
+ return (ISC_R_FAILURE);
+ }
+
+ header = (rbtdb_file_header_t *)(base + offset);
+ if (!match_header_version(header)) {
+ result = ISC_R_INVALIDFILE;
+ goto cleanup;
+ }
+
+ if (header->tree != 0) {
+ result = dns_rbt_deserialize_tree(
+ base, filesize, (off_t)header->tree, rbtdb->common.mctx,
+ delete_callback, rbtdb, rbt_datafixer, rbtdb, NULL,
+ &tree);
+ if (result != ISC_R_SUCCESS) {
+ goto cleanup;
+ }
+
+ result = dns_rbt_findnode(tree, &rbtdb->common.origin, NULL,
+ &origin_node, NULL,
+ DNS_RBTFIND_EMPTYDATA, NULL, NULL);
+ if (result != ISC_R_SUCCESS) {
+ goto cleanup;
+ }
+ }
+
+ if (header->nsec != 0) {
+ result = dns_rbt_deserialize_tree(
+ base, filesize, (off_t)header->nsec, rbtdb->common.mctx,
+ delete_callback, rbtdb, rbt_datafixer, rbtdb, NULL,
+ &nsec);
+ if (result != ISC_R_SUCCESS) {
+ goto cleanup;
+ }
+ }
+
+ if (header->nsec3 != 0) {
+ result = dns_rbt_deserialize_tree(
+ base, filesize, (off_t)header->nsec3,
+ rbtdb->common.mctx, delete_callback, rbtdb,
+ rbt_datafixer, rbtdb, NULL, &nsec3);
+ if (result != ISC_R_SUCCESS) {
+ goto cleanup;
+ }
+ }
+
+ /*
+ * We have a successfully loaded all the rbt trees now update
+ * rbtdb to use them.
+ */
+
+ rbtdb->mmap_location = base;
+ rbtdb->mmap_size = (size_t)filesize;
+
+ if (tree != NULL) {
+ dns_rbt_destroy(&rbtdb->tree);
+ rbtdb->tree = tree;
+ rbtdb->origin_node = origin_node;
+ }
+
+ if (nsec != NULL) {
+ dns_rbt_destroy(&rbtdb->nsec);
+ rbtdb->nsec = nsec;
+ }
+
+ if (nsec3 != NULL) {
+ dns_rbt_destroy(&rbtdb->nsec3);
+ rbtdb->nsec3 = nsec3;
+ }
+
+ return (ISC_R_SUCCESS);
+
+cleanup:
+ if (tree != NULL) {
+ dns_rbt_destroy(&tree);
+ }
+ if (nsec != NULL) {
+ dns_rbt_destroy(&nsec);
+ }
+ if (nsec3 != NULL) {
+ dns_rbt_destroy(&nsec3);
+ }
+ isc_file_munmap(base, (size_t)filesize);
+ return (result);
+}
+
+static isc_result_t
+beginload(dns_db_t *db, dns_rdatacallbacks_t *callbacks) {
+ rbtdb_load_t *loadctx;
+ dns_rbtdb_t *rbtdb;
+ rbtdb = (dns_rbtdb_t *)db;
+
+ REQUIRE(DNS_CALLBACK_VALID(callbacks));
+ REQUIRE(VALID_RBTDB(rbtdb));
+
+ loadctx = isc_mem_get(rbtdb->common.mctx, sizeof(*loadctx));
+
+ loadctx->rbtdb = rbtdb;
+ if (IS_CACHE(rbtdb)) {
+ isc_stdtime_get(&loadctx->now);
+ } else {
+ loadctx->now = 0;
+ }
+
+ RBTDB_LOCK(&rbtdb->lock, isc_rwlocktype_write);
+
+ REQUIRE((rbtdb->attributes &
+ (RBTDB_ATTR_LOADED | RBTDB_ATTR_LOADING)) == 0);
+ rbtdb->attributes |= RBTDB_ATTR_LOADING;
+
+ RBTDB_UNLOCK(&rbtdb->lock, isc_rwlocktype_write);
+
+ callbacks->add = loading_addrdataset;
+ callbacks->add_private = loadctx;
+ callbacks->deserialize = deserialize;
+ callbacks->deserialize_private = loadctx;
+
+ return (ISC_R_SUCCESS);
+}
+
+static isc_result_t
+endload(dns_db_t *db, dns_rdatacallbacks_t *callbacks) {
+ rbtdb_load_t *loadctx;
+ dns_rbtdb_t *rbtdb = (dns_rbtdb_t *)db;
+
+ REQUIRE(VALID_RBTDB(rbtdb));
+ REQUIRE(DNS_CALLBACK_VALID(callbacks));
+ loadctx = callbacks->add_private;
+ REQUIRE(loadctx != NULL);
+ REQUIRE(loadctx->rbtdb == rbtdb);
+
+ RBTDB_LOCK(&rbtdb->lock, isc_rwlocktype_write);
+
+ REQUIRE((rbtdb->attributes & RBTDB_ATTR_LOADING) != 0);
+ REQUIRE((rbtdb->attributes & RBTDB_ATTR_LOADED) == 0);
+
+ rbtdb->attributes &= ~RBTDB_ATTR_LOADING;
+ rbtdb->attributes |= RBTDB_ATTR_LOADED;
+
+ /*
+ * If there's a KEY rdataset at the zone origin containing a
+ * zone key, we consider the zone secure.
+ */
+ if (!IS_CACHE(rbtdb) && rbtdb->origin_node != NULL) {
+ dns_dbversion_t *version = rbtdb->current_version;
+ RBTDB_UNLOCK(&rbtdb->lock, isc_rwlocktype_write);
+ iszonesecure(db, version, rbtdb->origin_node);
+ } else {
+ RBTDB_UNLOCK(&rbtdb->lock, isc_rwlocktype_write);
+ }
+
+ callbacks->add = NULL;
+ callbacks->add_private = NULL;
+ callbacks->deserialize = NULL;
+ callbacks->deserialize_private = NULL;
+
+ isc_mem_put(rbtdb->common.mctx, loadctx, sizeof(*loadctx));
+
+ return (ISC_R_SUCCESS);
+}
+
+/*
+ * helper function to handle writing out the rdataset data pointed to
+ * by the void *data pointer in the dns_rbtnode
+ */
+static isc_result_t
+rbt_datawriter(FILE *rbtfile, unsigned char *data, void *arg, uint64_t *crc) {
+ rbtdb_version_t *version = (rbtdb_version_t *)arg;
+ rbtdb_serial_t serial;
+ rdatasetheader_t newheader;
+ rdatasetheader_t *header = (rdatasetheader_t *)data, *next;
+ off_t where;
+ size_t cooked, size;
+ unsigned char *p;
+ isc_result_t result = ISC_R_SUCCESS;
+ char pad[sizeof(char *)];
+ uintptr_t off;
+
+ REQUIRE(rbtfile != NULL);
+ REQUIRE(data != NULL);
+ REQUIRE(version != NULL);
+
+ serial = version->serial;
+
+ for (; header != NULL; header = next) {
+ next = header->next;
+ do {
+ if (header->serial <= serial && !IGNORE(header)) {
+ if (NONEXISTENT(header)) {
+ header = NULL;
+ }
+ break;
+ } else {
+ header = header->down;
+ }
+ } while (header != NULL);
+
+ if (header == NULL) {
+ continue;
+ }
+
+ CHECK(isc_stdio_tell(rbtfile, &where));
+ size = dns_rdataslab_size((unsigned char *)header,
+ sizeof(rdatasetheader_t));
+
+ p = (unsigned char *)header;
+ memmove(&newheader, p, sizeof(rdatasetheader_t));
+ newheader.down = NULL;
+ newheader.next = NULL;
+ off = where;
+ if ((off_t)off != where) {
+ return (ISC_R_RANGE);
+ }
+ newheader.node = (dns_rbtnode_t *)off;
+ newheader.node_is_relative = 1;
+ newheader.serial = 1;
+
+ /*
+ * Round size up to the next pointer sized offset so it
+ * will be properly aligned when read back in.
+ */
+ cooked = dns_rbt_serialize_align(size);
+ if (next != NULL) {
+ newheader.next = (rdatasetheader_t *)(off + cooked);
+ newheader.next_is_relative = 1;
+ }
+
+#ifdef DEBUG
+ hexdump("writing header", (unsigned char *)&newheader,
+ sizeof(rdatasetheader_t));
+ hexdump("writing slab", p + sizeof(rdatasetheader_t),
+ size - sizeof(rdatasetheader_t));
+#endif /* ifdef DEBUG */
+ isc_crc64_update(crc, (unsigned char *)&newheader,
+ sizeof(rdatasetheader_t));
+ CHECK(isc_stdio_write(&newheader, sizeof(rdatasetheader_t), 1,
+ rbtfile, NULL));
+
+ isc_crc64_update(crc, p + sizeof(rdatasetheader_t),
+ size - sizeof(rdatasetheader_t));
+ CHECK(isc_stdio_write(p + sizeof(rdatasetheader_t),
+ size - sizeof(rdatasetheader_t), 1,
+ rbtfile, NULL));
+ /*
+ * Pad to force alignment.
+ */
+ if (size != (size_t)cooked) {
+ memset(pad, 0, sizeof(pad));
+ CHECK(isc_stdio_write(pad, cooked - size, 1, rbtfile,
+ NULL));
+ }
+ }
+
+failure:
+ return (result);
+}
+
+/*
+ * Write out a zeroed header as a placeholder. Doing this ensures
+ * that the file will not read while it is partially written, should
+ * writing fail or be interrupted.
+ */
+static isc_result_t
+rbtdb_zero_header(FILE *rbtfile) {
+ char buffer[RBTDB_HEADER_LENGTH];
+ isc_result_t result;
+
+ memset(buffer, 0, RBTDB_HEADER_LENGTH);
+ result = isc_stdio_write(buffer, 1, RBTDB_HEADER_LENGTH, rbtfile, NULL);
+ fflush(rbtfile);
+
+ return (result);
+}
+
+static isc_once_t once = ISC_ONCE_INIT;
+
+static void
+init_file_version(void) {
+ int n;
+
+ memset(FILE_VERSION, 0, sizeof(FILE_VERSION));
+ n = snprintf(FILE_VERSION, sizeof(FILE_VERSION), "RBTDB Image %s %s",
+ dns_major, dns_mapapi);
+ INSIST(n > 0 && (unsigned int)n < sizeof(FILE_VERSION));
+}
+
+/*
+ * Write the file header out, recording the locations of the three
+ * RBT's used in the rbtdb: tree, nsec, and nsec3, and including NodeDump
+ * version information and any information stored in the rbtdb object
+ * itself that should be stored here.
+ */
+static isc_result_t
+rbtdb_write_header(FILE *rbtfile, off_t tree_location, off_t nsec_location,
+ off_t nsec3_location) {
+ rbtdb_file_header_t header;
+ isc_result_t result;
+
+ RUNTIME_CHECK(isc_once_do(&once, init_file_version) == ISC_R_SUCCESS);
+
+ memset(&header, 0, sizeof(rbtdb_file_header_t));
+ memmove(header.version1, FILE_VERSION, sizeof(header.version1));
+ memmove(header.version2, FILE_VERSION, sizeof(header.version2));
+ header.ptrsize = (uint32_t)sizeof(void *);
+ header.bigendian = (1 == htonl(1)) ? 1 : 0;
+ header.tree = (uint64_t)tree_location;
+ header.nsec = (uint64_t)nsec_location;
+ header.nsec3 = (uint64_t)nsec3_location;
+ result = isc_stdio_write(&header, 1, sizeof(rbtdb_file_header_t),
+ rbtfile, NULL);
+ fflush(rbtfile);
+
+ return (result);
+}
+
+static bool
+match_header_version(rbtdb_file_header_t *header) {
+ RUNTIME_CHECK(isc_once_do(&once, init_file_version) == ISC_R_SUCCESS);
+
+ if (memcmp(header->version1, FILE_VERSION, sizeof(header->version1)) !=
+ 0 ||
+ memcmp(header->version2, FILE_VERSION, sizeof(header->version1)) !=
+ 0)
+ {
+ return (false);
+ }
+
+ return (true);
+}
+
+static isc_result_t
+serialize(dns_db_t *db, dns_dbversion_t *ver, FILE *rbtfile) {
+ rbtdb_version_t *version = (rbtdb_version_t *)ver;
+ dns_rbtdb_t *rbtdb;
+ isc_result_t result;
+ off_t tree_location, nsec_location, nsec3_location, header_location;
+
+ rbtdb = (dns_rbtdb_t *)db;
+
+ REQUIRE(VALID_RBTDB(rbtdb));
+ REQUIRE(rbtfile != NULL);
+
+ /* Ensure we're writing to a plain file */
+ CHECK(isc_file_isplainfilefd(fileno(rbtfile)));
+
+ /*
+ * first, write out a zeroed header to store rbtdb information
+ *
+ * then for each of the three trees, store the current position
+ * in the file and call dns_rbt_serialize_tree
+ *
+ * finally, write out the rbtdb header, storing the locations of the
+ * rbtheaders
+ *
+ * NOTE: need to do something better with the return codes, &= will
+ * not work.
+ */
+ CHECK(isc_stdio_tell(rbtfile, &header_location));
+ CHECK(rbtdb_zero_header(rbtfile));
+ CHECK(dns_rbt_serialize_tree(rbtfile, rbtdb->tree, rbt_datawriter,
+ version, &tree_location));
+ CHECK(dns_rbt_serialize_tree(rbtfile, rbtdb->nsec, rbt_datawriter,
+ version, &nsec_location));
+ CHECK(dns_rbt_serialize_tree(rbtfile, rbtdb->nsec3, rbt_datawriter,
+ version, &nsec3_location));
+
+ CHECK(isc_stdio_seek(rbtfile, header_location, SEEK_SET));
+ CHECK(rbtdb_write_header(rbtfile, tree_location, nsec_location,
+ nsec3_location));
+failure:
+ return (result);
+}
+
+static isc_result_t
+dump(dns_db_t *db, dns_dbversion_t *version, const char *filename,
+ dns_masterformat_t masterformat) {
+ dns_rbtdb_t *rbtdb;
+ rbtdb_version_t *rbtversion = version;
+
+ rbtdb = (dns_rbtdb_t *)db;
+
+ REQUIRE(VALID_RBTDB(rbtdb));
+ INSIST(rbtversion == NULL || rbtversion->rbtdb == rbtdb);
+
+ return (dns_master_dump(rbtdb->common.mctx, db, version,
+ &dns_master_style_default, filename,
+ masterformat, NULL));
+}
+
+static void
+delete_callback(void *data, void *arg) {
+ dns_rbtdb_t *rbtdb = arg;
+ rdatasetheader_t *current, *next;
+ unsigned int locknum;
+
+ current = data;
+ locknum = current->node->locknum;
+ NODE_LOCK(&rbtdb->node_locks[locknum].lock, isc_rwlocktype_write);
+ while (current != NULL) {
+ next = current->next;
+ free_rdataset(rbtdb, rbtdb->common.mctx, current);
+ current = next;
+ }
+ NODE_UNLOCK(&rbtdb->node_locks[locknum].lock, isc_rwlocktype_write);
+}
+
+static bool
+issecure(dns_db_t *db) {
+ dns_rbtdb_t *rbtdb;
+ bool secure;
+
+ rbtdb = (dns_rbtdb_t *)db;
+
+ REQUIRE(VALID_RBTDB(rbtdb));
+
+ RBTDB_LOCK(&rbtdb->lock, isc_rwlocktype_read);
+ secure = (rbtdb->current_version->secure == dns_db_secure);
+ RBTDB_UNLOCK(&rbtdb->lock, isc_rwlocktype_read);
+
+ return (secure);
+}
+
+static bool
+isdnssec(dns_db_t *db) {
+ dns_rbtdb_t *rbtdb;
+ bool dnssec;
+
+ rbtdb = (dns_rbtdb_t *)db;
+
+ REQUIRE(VALID_RBTDB(rbtdb));
+
+ RBTDB_LOCK(&rbtdb->lock, isc_rwlocktype_read);
+ dnssec = (rbtdb->current_version->secure != dns_db_insecure);
+ RBTDB_UNLOCK(&rbtdb->lock, isc_rwlocktype_read);
+
+ return (dnssec);
+}
+
+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 size_t
+hashsize(dns_db_t *db) {
+ dns_rbtdb_t *rbtdb;
+ size_t size;
+
+ rbtdb = (dns_rbtdb_t *)db;
+
+ REQUIRE(VALID_RBTDB(rbtdb));
+
+ RWLOCK(&rbtdb->tree_lock, isc_rwlocktype_read);
+ size = dns_rbt_hashsize(rbtdb->tree);
+ RWUNLOCK(&rbtdb->tree_lock, isc_rwlocktype_read);
+
+ return (size);
+}
+
+static isc_result_t
+adjusthashsize(dns_db_t *db, size_t size) {
+ isc_result_t result;
+ dns_rbtdb_t *rbtdb;
+
+ rbtdb = (dns_rbtdb_t *)db;
+
+ REQUIRE(VALID_RBTDB(rbtdb));
+
+ RWLOCK(&rbtdb->tree_lock, isc_rwlocktype_write);
+ result = dns_rbt_adjusthashsize(rbtdb->tree, size);
+ RWUNLOCK(&rbtdb->tree_lock, isc_rwlocktype_write);
+
+ return (result);
+}
+
+static void
+settask(dns_db_t *db, isc_task_t *task) {
+ dns_rbtdb_t *rbtdb;
+
+ rbtdb = (dns_rbtdb_t *)db;
+
+ REQUIRE(VALID_RBTDB(rbtdb));
+
+ RBTDB_LOCK(&rbtdb->lock, isc_rwlocktype_write);
+ if (rbtdb->task != NULL) {
+ isc_task_detach(&rbtdb->task);
+ }
+ if (task != NULL) {
+ isc_task_attach(task, &rbtdb->task);
+ }
+ RBTDB_UNLOCK(&rbtdb->lock, isc_rwlocktype_write);
+}
+
+static bool
+ispersistent(dns_db_t *db) {
+ UNUSED(db);
+ return (false);
+}
+
+static isc_result_t
+getoriginnode(dns_db_t *db, dns_dbnode_t **nodep) {
+ dns_rbtdb_t *rbtdb = (dns_rbtdb_t *)db;
+ dns_rbtnode_t *onode;
+ isc_result_t result = ISC_R_SUCCESS;
+
+ REQUIRE(VALID_RBTDB(rbtdb));
+ REQUIRE(nodep != NULL && *nodep == NULL);
+
+ /* Note that the access to origin_node doesn't require a DB lock */
+ onode = (dns_rbtnode_t *)rbtdb->origin_node;
+ if (onode != NULL) {
+ new_reference(rbtdb, onode, isc_rwlocktype_none);
+ *nodep = rbtdb->origin_node;
+ } else {
+ INSIST(IS_CACHE(rbtdb));
+ result = ISC_R_NOTFOUND;
+ }
+
+ return (result);
+}
+
+static isc_result_t
+getnsec3parameters(dns_db_t *db, dns_dbversion_t *version, dns_hash_t *hash,
+ uint8_t *flags, uint16_t *iterations, unsigned char *salt,
+ size_t *salt_length) {
+ dns_rbtdb_t *rbtdb;
+ isc_result_t result = ISC_R_NOTFOUND;
+ rbtdb_version_t *rbtversion = version;
+
+ rbtdb = (dns_rbtdb_t *)db;
+
+ REQUIRE(VALID_RBTDB(rbtdb));
+ INSIST(rbtversion == NULL || rbtversion->rbtdb == rbtdb);
+
+ RBTDB_LOCK(&rbtdb->lock, isc_rwlocktype_read);
+ if (rbtversion == NULL) {
+ rbtversion = rbtdb->current_version;
+ }
+
+ if (rbtversion->havensec3) {
+ if (hash != NULL) {
+ *hash = rbtversion->hash;
+ }
+ if (salt != NULL && salt_length != NULL) {
+ REQUIRE(*salt_length >= rbtversion->salt_length);
+ memmove(salt, rbtversion->salt,
+ rbtversion->salt_length);
+ }
+ if (salt_length != NULL) {
+ *salt_length = rbtversion->salt_length;
+ }
+ if (iterations != NULL) {
+ *iterations = rbtversion->iterations;
+ }
+ if (flags != NULL) {
+ *flags = rbtversion->flags;
+ }
+ result = ISC_R_SUCCESS;
+ }
+ RBTDB_UNLOCK(&rbtdb->lock, isc_rwlocktype_read);
+
+ return (result);
+}
+
+static isc_result_t
+getsize(dns_db_t *db, dns_dbversion_t *version, uint64_t *records,
+ uint64_t *xfrsize) {
+ dns_rbtdb_t *rbtdb;
+ isc_result_t result = ISC_R_SUCCESS;
+ rbtdb_version_t *rbtversion = version;
+
+ rbtdb = (dns_rbtdb_t *)db;
+
+ REQUIRE(VALID_RBTDB(rbtdb));
+ INSIST(rbtversion == NULL || rbtversion->rbtdb == rbtdb);
+
+ RBTDB_LOCK(&rbtdb->lock, isc_rwlocktype_read);
+ if (rbtversion == NULL) {
+ rbtversion = rbtdb->current_version;
+ }
+
+ RWLOCK(&rbtversion->rwlock, isc_rwlocktype_read);
+ if (records != NULL) {
+ *records = rbtversion->records;
+ }
+
+ if (xfrsize != NULL) {
+ *xfrsize = rbtversion->xfrsize;
+ }
+ RWUNLOCK(&rbtversion->rwlock, isc_rwlocktype_read);
+ RBTDB_UNLOCK(&rbtdb->lock, isc_rwlocktype_read);
+
+ return (result);
+}
+
+static isc_result_t
+setsigningtime(dns_db_t *db, dns_rdataset_t *rdataset, isc_stdtime_t resign) {
+ dns_rbtdb_t *rbtdb = (dns_rbtdb_t *)db;
+ rdatasetheader_t *header, oldheader;
+
+ REQUIRE(VALID_RBTDB(rbtdb));
+ REQUIRE(!IS_CACHE(rbtdb));
+ REQUIRE(rdataset != NULL);
+
+ header = rdataset->private3;
+ header--;
+
+ NODE_LOCK(&rbtdb->node_locks[header->node->locknum].lock,
+ isc_rwlocktype_write);
+
+ oldheader = *header;
+ /*
+ * Only break the heap invariant (by adjusting resign and resign_lsb)
+ * if we are going to be restoring it by calling isc_heap_increased
+ * or isc_heap_decreased.
+ */
+ if (resign != 0) {
+ header->resign = (isc_stdtime_t)(dns_time64_from32(resign) >>
+ 1);
+ header->resign_lsb = resign & 0x1;
+ }
+ if (header->heap_index != 0) {
+ INSIST(RESIGN(header));
+ if (resign == 0) {
+ isc_heap_delete(rbtdb->heaps[header->node->locknum],
+ header->heap_index);
+ header->heap_index = 0;
+ } else if (resign_sooner(header, &oldheader)) {
+ isc_heap_increased(rbtdb->heaps[header->node->locknum],
+ header->heap_index);
+ } else if (resign_sooner(&oldheader, header)) {
+ isc_heap_decreased(rbtdb->heaps[header->node->locknum],
+ header->heap_index);
+ }
+ } else if (resign != 0) {
+ RDATASET_ATTR_SET(header, RDATASET_ATTR_RESIGN);
+ resign_insert(rbtdb, header->node->locknum, header);
+ }
+ NODE_UNLOCK(&rbtdb->node_locks[header->node->locknum].lock,
+ isc_rwlocktype_write);
+ return (ISC_R_SUCCESS);
+}
+
+static isc_result_t
+getsigningtime(dns_db_t *db, dns_rdataset_t *rdataset, dns_name_t *foundname) {
+ dns_rbtdb_t *rbtdb = (dns_rbtdb_t *)db;
+ rdatasetheader_t *header = NULL, *this;
+ unsigned int i;
+ isc_result_t result = ISC_R_NOTFOUND;
+ unsigned int locknum = 0;
+
+ REQUIRE(VALID_RBTDB(rbtdb));
+
+ RWLOCK(&rbtdb->tree_lock, isc_rwlocktype_read);
+
+ for (i = 0; i < rbtdb->node_lock_count; i++) {
+ NODE_LOCK(&rbtdb->node_locks[i].lock, isc_rwlocktype_read);
+
+ /*
+ * Find for the earliest signing time among all of the
+ * heaps, each of which is covered by a different bucket
+ * lock.
+ */
+ this = isc_heap_element(rbtdb->heaps[i], 1);
+ if (this == NULL) {
+ /* Nothing found; unlock and try the next heap. */
+ NODE_UNLOCK(&rbtdb->node_locks[i].lock,
+ isc_rwlocktype_read);
+ continue;
+ }
+
+ if (header == NULL) {
+ /*
+ * Found a signing time: retain the bucket lock and
+ * preserve the lock number so we can unlock it
+ * later.
+ */
+ header = this;
+ locknum = i;
+ } else if (resign_sooner(this, header)) {
+ /*
+ * Found an earlier signing time; release the
+ * previous bucket lock and retain this one instead.
+ */
+ NODE_UNLOCK(&rbtdb->node_locks[locknum].lock,
+ isc_rwlocktype_read);
+ header = this;
+ locknum = i;
+ } else {
+ /*
+ * Earliest signing time in this heap isn't
+ * an improvement; unlock and try the next heap.
+ */
+ NODE_UNLOCK(&rbtdb->node_locks[i].lock,
+ isc_rwlocktype_read);
+ }
+ }
+
+ if (header != NULL) {
+ /*
+ * Found something; pass back the answer and unlock
+ * the bucket.
+ */
+ bind_rdataset(rbtdb, header->node, header, 0,
+ isc_rwlocktype_read, rdataset);
+
+ if (foundname != NULL) {
+ dns_rbt_fullnamefromnode(header->node, foundname);
+ }
+
+ NODE_UNLOCK(&rbtdb->node_locks[locknum].lock,
+ isc_rwlocktype_read);
+
+ result = ISC_R_SUCCESS;
+ }
+
+ RWUNLOCK(&rbtdb->tree_lock, isc_rwlocktype_read);
+
+ return (result);
+}
+
+static void
+resigned(dns_db_t *db, dns_rdataset_t *rdataset, dns_dbversion_t *version) {
+ rbtdb_version_t *rbtversion = (rbtdb_version_t *)version;
+ dns_rbtdb_t *rbtdb = (dns_rbtdb_t *)db;
+ dns_rbtnode_t *node;
+ rdatasetheader_t *header;
+
+ REQUIRE(VALID_RBTDB(rbtdb));
+ REQUIRE(rdataset != NULL);
+ REQUIRE(rdataset->methods == &rdataset_methods);
+ REQUIRE(rbtdb->future_version == rbtversion);
+ REQUIRE(rbtversion != NULL);
+ REQUIRE(rbtversion->writer);
+ REQUIRE(rbtversion->rbtdb == rbtdb);
+
+ node = rdataset->private2;
+ INSIST(node != NULL);
+ header = rdataset->private3;
+ INSIST(header != NULL);
+ header--;
+
+ if (header->heap_index == 0) {
+ return;
+ }
+
+ RWLOCK(&rbtdb->tree_lock, isc_rwlocktype_write);
+ NODE_LOCK(&rbtdb->node_locks[node->locknum].lock, isc_rwlocktype_write);
+ /*
+ * Delete from heap and save to re-signed list so that it can
+ * be restored if we backout of this change.
+ */
+ resign_delete(rbtdb, rbtversion, header);
+ NODE_UNLOCK(&rbtdb->node_locks[node->locknum].lock,
+ isc_rwlocktype_write);
+ RWUNLOCK(&rbtdb->tree_lock, isc_rwlocktype_write);
+}
+
+static isc_result_t
+setcachestats(dns_db_t *db, isc_stats_t *stats) {
+ dns_rbtdb_t *rbtdb = (dns_rbtdb_t *)db;
+
+ REQUIRE(VALID_RBTDB(rbtdb));
+ REQUIRE(IS_CACHE(rbtdb)); /* current restriction */
+ REQUIRE(stats != NULL);
+
+ isc_stats_attach(stats, &rbtdb->cachestats);
+ return (ISC_R_SUCCESS);
+}
+
+static isc_result_t
+setgluecachestats(dns_db_t *db, isc_stats_t *stats) {
+ dns_rbtdb_t *rbtdb = (dns_rbtdb_t *)db;
+
+ REQUIRE(VALID_RBTDB(rbtdb));
+ REQUIRE(!IS_CACHE(rbtdb) && !IS_STUB(rbtdb));
+ REQUIRE(stats != NULL);
+
+ isc_stats_attach(stats, &rbtdb->gluecachestats);
+ return (ISC_R_SUCCESS);
+}
+
+static dns_stats_t *
+getrrsetstats(dns_db_t *db) {
+ dns_rbtdb_t *rbtdb = (dns_rbtdb_t *)db;
+
+ REQUIRE(VALID_RBTDB(rbtdb));
+ REQUIRE(IS_CACHE(rbtdb)); /* current restriction */
+
+ return (rbtdb->rrsetstats);
+}
+
+static isc_result_t
+nodefullname(dns_db_t *db, dns_dbnode_t *node, dns_name_t *name) {
+ dns_rbtdb_t *rbtdb = (dns_rbtdb_t *)db;
+ dns_rbtnode_t *rbtnode = (dns_rbtnode_t *)node;
+ isc_result_t result;
+
+ REQUIRE(VALID_RBTDB(rbtdb));
+ REQUIRE(node != NULL);
+ REQUIRE(name != NULL);
+
+ RWLOCK(&rbtdb->tree_lock, isc_rwlocktype_read);
+ result = dns_rbt_fullnamefromnode(rbtnode, name);
+ RWUNLOCK(&rbtdb->tree_lock, isc_rwlocktype_read);
+
+ return (result);
+}
+
+static isc_result_t
+setservestalettl(dns_db_t *db, dns_ttl_t ttl) {
+ dns_rbtdb_t *rbtdb = (dns_rbtdb_t *)db;
+
+ REQUIRE(VALID_RBTDB(rbtdb));
+ REQUIRE(IS_CACHE(rbtdb));
+
+ /* currently no bounds checking. 0 means disable. */
+ rbtdb->serve_stale_ttl = ttl;
+ return (ISC_R_SUCCESS);
+}
+
+static isc_result_t
+getservestalettl(dns_db_t *db, dns_ttl_t *ttl) {
+ dns_rbtdb_t *rbtdb = (dns_rbtdb_t *)db;
+
+ REQUIRE(VALID_RBTDB(rbtdb));
+ REQUIRE(IS_CACHE(rbtdb));
+
+ *ttl = rbtdb->serve_stale_ttl;
+ return (ISC_R_SUCCESS);
+}
+
+static isc_result_t
+setservestalerefresh(dns_db_t *db, uint32_t interval) {
+ dns_rbtdb_t *rbtdb = (dns_rbtdb_t *)db;
+
+ REQUIRE(VALID_RBTDB(rbtdb));
+ REQUIRE(IS_CACHE(rbtdb));
+
+ /* currently no bounds checking. 0 means disable. */
+ rbtdb->serve_stale_refresh = interval;
+ return (ISC_R_SUCCESS);
+}
+
+static isc_result_t
+getservestalerefresh(dns_db_t *db, uint32_t *interval) {
+ dns_rbtdb_t *rbtdb = (dns_rbtdb_t *)db;
+
+ REQUIRE(VALID_RBTDB(rbtdb));
+ REQUIRE(IS_CACHE(rbtdb));
+
+ *interval = rbtdb->serve_stale_refresh;
+ return (ISC_R_SUCCESS);
+}
+
+static dns_dbmethods_t zone_methods = { attach,
+ detach,
+ beginload,
+ endload,
+ serialize,
+ 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,
+ getoriginnode,
+ NULL, /* transfernode */
+ getnsec3parameters,
+ findnsec3node,
+ setsigningtime,
+ getsigningtime,
+ resigned,
+ isdnssec,
+ NULL, /* getrrsetstats */
+ NULL, /* rpz_attach */
+ NULL, /* rpz_ready */
+ NULL, /* findnodeext */
+ NULL, /* findext */
+ NULL, /* setcachestats */
+ hashsize,
+ nodefullname,
+ getsize,
+ NULL, /* setservestalettl */
+ NULL, /* getservestalettl */
+ NULL, /* setservestalerefresh */
+ NULL, /* getservestalerefresh */
+ setgluecachestats,
+ adjusthashsize };
+
+static dns_dbmethods_t cache_methods = { attach,
+ detach,
+ beginload,
+ endload,
+ NULL, /* serialize */
+ 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,
+ getoriginnode,
+ NULL, /* transfernode */
+ NULL, /* getnsec3parameters */
+ NULL, /* findnsec3node */
+ NULL, /* setsigningtime */
+ NULL, /* getsigningtime */
+ NULL, /* resigned */
+ isdnssec,
+ getrrsetstats,
+ NULL, /* rpz_attach */
+ NULL, /* rpz_ready */
+ NULL, /* findnodeext */
+ NULL, /* findext */
+ setcachestats,
+ hashsize,
+ nodefullname,
+ NULL, /* getsize */
+ setservestalettl,
+ getservestalettl,
+ setservestalerefresh,
+ getservestalerefresh,
+ NULL,
+ adjusthashsize };
+
+isc_result_t
+dns_rbtdb_create(isc_mem_t *mctx, const 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;
+ bool (*sooner)(void *, void *);
+ isc_mem_t *hmctx = mctx;
+
+ /* Keep the compiler happy. */
+ UNUSED(driverarg);
+
+ rbtdb = isc_mem_get(mctx, sizeof(*rbtdb));
+
+ /*
+ * If argv[0] exists, it points to a memory context to use for heap
+ */
+ if (argc != 0) {
+ hmctx = (isc_mem_t *)argv[0];
+ }
+
+ 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;
+
+ ISC_LIST_INIT(rbtdb->common.update_listeners);
+
+ RBTDB_INITLOCK(&rbtdb->lock);
+
+ isc_rwlock_init(&rbtdb->tree_lock, 0, 0);
+
+ /*
+ * Initialize node_lock_count in a generic way to support future
+ * extension which allows the user to specify this value on creation.
+ * Note that when specified for a cache DB it must be larger than 1
+ * as commented with the definition of DEFAULT_CACHE_NODE_LOCK_COUNT.
+ */
+ if (rbtdb->node_lock_count == 0) {
+ if (IS_CACHE(rbtdb)) {
+ rbtdb->node_lock_count = DEFAULT_CACHE_NODE_LOCK_COUNT;
+ } else {
+ rbtdb->node_lock_count = DEFAULT_NODE_LOCK_COUNT;
+ }
+ } else if (rbtdb->node_lock_count < 2 && IS_CACHE(rbtdb)) {
+ result = ISC_R_RANGE;
+ goto cleanup_tree_lock;
+ }
+ INSIST(rbtdb->node_lock_count < (1 << DNS_RBT_LOCKLENGTH));
+ rbtdb->node_locks = isc_mem_get(mctx, rbtdb->node_lock_count *
+ sizeof(rbtdb_nodelock_t));
+
+ rbtdb->cachestats = NULL;
+ rbtdb->gluecachestats = NULL;
+
+ rbtdb->rrsetstats = NULL;
+ if (IS_CACHE(rbtdb)) {
+ result = dns_rdatasetstats_create(mctx, &rbtdb->rrsetstats);
+ if (result != ISC_R_SUCCESS) {
+ goto cleanup_node_locks;
+ }
+ rbtdb->rdatasets = isc_mem_get(
+ mctx,
+ rbtdb->node_lock_count * sizeof(rdatasetheaderlist_t));
+ for (i = 0; i < (int)rbtdb->node_lock_count; i++) {
+ ISC_LIST_INIT(rbtdb->rdatasets[i]);
+ }
+ } else {
+ rbtdb->rdatasets = NULL;
+ }
+
+ /*
+ * Create the heaps.
+ */
+ rbtdb->heaps = isc_mem_get(hmctx, rbtdb->node_lock_count *
+ sizeof(isc_heap_t *));
+ for (i = 0; i < (int)rbtdb->node_lock_count; i++) {
+ rbtdb->heaps[i] = NULL;
+ }
+ sooner = IS_CACHE(rbtdb) ? ttl_sooner : resign_sooner;
+ for (i = 0; i < (int)rbtdb->node_lock_count; i++) {
+ isc_heap_create(hmctx, sooner, set_index, 0, &rbtdb->heaps[i]);
+ }
+
+ /*
+ * Create deadnode lists.
+ */
+ rbtdb->deadnodes = isc_mem_get(mctx, rbtdb->node_lock_count *
+ sizeof(rbtnodelist_t));
+ for (i = 0; i < (int)rbtdb->node_lock_count; i++) {
+ ISC_LIST_INIT(rbtdb->deadnodes[i]);
+ }
+
+ rbtdb->active = rbtdb->node_lock_count;
+
+ for (i = 0; i < (int)(rbtdb->node_lock_count); i++) {
+ NODE_INITLOCK(&rbtdb->node_locks[i].lock);
+ isc_refcount_init(&rbtdb->node_locks[i].references, 0);
+ rbtdb->node_locks[i].exiting = 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);
+ isc_mem_attach(hmctx, &rbtdb->hmctx);
+
+ /*
+ * Make a copy of the origin name.
+ */
+ result = dns_name_dupwithoffsets(origin, mctx, &rbtdb->common.origin);
+ if (result != ISC_R_SUCCESS) {
+ free_rbtdb(rbtdb, false, NULL);
+ return (result);
+ }
+
+ /*
+ * Make the Red-Black Trees.
+ */
+ result = dns_rbt_create(mctx, delete_callback, rbtdb, &rbtdb->tree);
+ if (result != ISC_R_SUCCESS) {
+ free_rbtdb(rbtdb, false, NULL);
+ return (result);
+ }
+
+ result = dns_rbt_create(mctx, delete_callback, rbtdb, &rbtdb->nsec);
+ if (result != ISC_R_SUCCESS) {
+ free_rbtdb(rbtdb, false, NULL);
+ return (result);
+ }
+
+ result = dns_rbt_create(mctx, delete_callback, rbtdb, &rbtdb->nsec3);
+ if (result != ISC_R_SUCCESS) {
+ free_rbtdb(rbtdb, 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, false, NULL);
+ return (result);
+ }
+ INSIST(rbtdb->origin_node != NULL);
+ rbtdb->origin_node->nsec = DNS_RBT_NSEC_NORMAL;
+ /*
+ * We need to give the origin node the right locknum.
+ */
+ dns_name_init(&name, NULL);
+ dns_rbt_namefromnode(rbtdb->origin_node, &name);
+ rbtdb->origin_node->locknum = rbtdb->origin_node->hashval %
+ rbtdb->node_lock_count;
+ /*
+ * Add an apex node to the NSEC3 tree so that NSEC3 searches
+ * return partial matches when there is only a single NSEC3
+ * record in the tree.
+ */
+ rbtdb->nsec3_origin_node = NULL;
+ result = dns_rbt_addnode(rbtdb->nsec3, &rbtdb->common.origin,
+ &rbtdb->nsec3_origin_node);
+ if (result != ISC_R_SUCCESS) {
+ INSIST(result != ISC_R_EXISTS);
+ free_rbtdb(rbtdb, false, NULL);
+ return (result);
+ }
+ rbtdb->nsec3_origin_node->nsec = DNS_RBT_NSEC_NSEC3;
+ /*
+ * We need to give the nsec3 origin node the right locknum.
+ */
+ dns_name_init(&name, NULL);
+ dns_rbt_namefromnode(rbtdb->nsec3_origin_node, &name);
+ rbtdb->nsec3_origin_node->locknum =
+ rbtdb->nsec3_origin_node->hashval %
+ rbtdb->node_lock_count;
+ }
+
+ /*
+ * Misc. Initialization.
+ */
+ isc_refcount_init(&rbtdb->references, 1);
+ rbtdb->attributes = 0;
+ rbtdb->task = NULL;
+ rbtdb->serve_stale_ttl = 0;
+
+ /*
+ * Version Initialization.
+ */
+ rbtdb->current_serial = 1;
+ rbtdb->least_serial = 1;
+ rbtdb->next_serial = 2;
+ rbtdb->current_version = allocate_version(mctx, 1, 1, false);
+ rbtdb->current_version->rbtdb = rbtdb;
+ rbtdb->current_version->secure = dns_db_insecure;
+ rbtdb->current_version->havensec3 = false;
+ rbtdb->current_version->flags = 0;
+ rbtdb->current_version->iterations = 0;
+ rbtdb->current_version->hash = 0;
+ rbtdb->current_version->salt_length = 0;
+ memset(rbtdb->current_version->salt, 0,
+ sizeof(rbtdb->current_version->salt));
+ isc_rwlock_init(&rbtdb->current_version->rwlock, 0, 0);
+ rbtdb->current_version->records = 0;
+ rbtdb->current_version->xfrsize = 0;
+ rbtdb->future_version = NULL;
+ ISC_LIST_INIT(rbtdb->open_versions);
+ /*
+ * Keep the current version in the open list so that list operation
+ * won't happen in normal lookup operations.
+ */
+ PREPEND(rbtdb->open_versions, rbtdb->current_version, link);
+
+ rbtdb->common.magic = DNS_DB_MAGIC;
+ rbtdb->common.impmagic = RBTDB_MAGIC;
+
+ *dbp = (dns_db_t *)rbtdb;
+
+ return (ISC_R_SUCCESS);
+
+cleanup_node_locks:
+ isc_mem_put(mctx, rbtdb->node_locks,
+ rbtdb->node_lock_count * sizeof(rbtdb_nodelock_t));
+
+cleanup_tree_lock:
+ isc_rwlock_destroy(&rbtdb->tree_lock);
+ RBTDB_DESTROYLOCK(&rbtdb->lock);
+ isc_mem_put(mctx, rbtdb, sizeof(*rbtdb));
+ return (result);
+}
+
+/*
+ * 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; /* RDATASLAB */
+ unsigned int count;
+
+ count = raw[0] * 256 + raw[1];
+ if (count == 0) {
+ rdataset->private5 = NULL;
+ return (ISC_R_NOMORE);
+ }
+
+ if ((rdataset->attributes & DNS_RDATASETATTR_LOADORDER) == 0) {
+ raw += DNS_RDATASET_COUNT;
+ }
+
+ raw += DNS_RDATASET_LENGTH;
+
+ /*
+ * The privateuint4 field is the number of rdata beyond the
+ * cursor position, so we decrement the total count by one
+ * before storing it.
+ *
+ * If DNS_RDATASETATTR_LOADORDER is not set 'raw' points to the
+ * first record. If DNS_RDATASETATTR_LOADORDER is set 'raw' points
+ * to the first entry in the offset table.
+ */
+ 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; /* RDATASLAB */
+
+ count = rdataset->privateuint4;
+ if (count == 0) {
+ return (ISC_R_NOMORE);
+ }
+ count--;
+ rdataset->privateuint4 = count;
+
+ /*
+ * Skip forward one record (length + 4) or one offset (4).
+ */
+ raw = rdataset->private5;
+#if DNS_RDATASET_FIXED
+ if ((rdataset->attributes & DNS_RDATASETATTR_LOADORDER) == 0)
+#endif /* DNS_RDATASET_FIXED */
+ {
+ length = raw[0] * 256 + raw[1];
+ raw += length;
+ }
+
+ rdataset->private5 = raw + DNS_RDATASET_ORDER + DNS_RDATASET_LENGTH;
+
+ return (ISC_R_SUCCESS);
+}
+
+static void
+rdataset_current(dns_rdataset_t *rdataset, dns_rdata_t *rdata) {
+ unsigned char *raw = rdataset->private5; /* RDATASLAB */
+ unsigned int length;
+ isc_region_t r;
+ unsigned int flags = 0;
+
+ REQUIRE(raw != NULL);
+
+ /*
+ * Find the start of the record if not already in private5
+ * then skip the length and order fields.
+ */
+#if DNS_RDATASET_FIXED
+ if ((rdataset->attributes & DNS_RDATASETATTR_LOADORDER) != 0) {
+ unsigned int offset;
+ offset = ((unsigned int)raw[0] << 24) +
+ ((unsigned int)raw[1] << 16) +
+ ((unsigned int)raw[2] << 8) + (unsigned int)raw[3];
+ raw = rdataset->private3;
+ raw += offset;
+ }
+#endif /* if DNS_RDATASET_FIXED */
+
+ length = raw[0] * 256 + raw[1];
+
+ raw += DNS_RDATASET_ORDER + DNS_RDATASET_LENGTH;
+
+ if (rdataset->type == dns_rdatatype_rrsig) {
+ if (*raw & DNS_RDATASLAB_OFFLINE) {
+ flags |= DNS_RDATA_OFFLINE;
+ }
+ length--;
+ raw++;
+ }
+ r.length = length;
+ r.base = raw;
+ dns_rdata_fromregion(rdata, rdataset->rdclass, rdataset->type, &r);
+ rdata->flags |= flags;
+}
+
+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);
+ INSIST(!ISC_LINK_LINKED(target, link));
+ *target = *source;
+ ISC_LINK_INIT(target, link);
+
+ /*
+ * Reset iterator state.
+ */
+ target->privateuint4 = 0;
+ target->private5 = NULL;
+}
+
+static unsigned int
+rdataset_count(dns_rdataset_t *rdataset) {
+ unsigned char *raw = rdataset->private3; /* RDATASLAB */
+ 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;
+ const struct noqname *noqname = rdataset->private6;
+
+ cloned_node = NULL;
+ attachnode(db, node, &cloned_node);
+ nsec->methods = &slab_methods;
+ nsec->rdclass = db->rdclass;
+ nsec->type = noqname->type;
+ nsec->covers = 0;
+ nsec->ttl = rdataset->ttl;
+ nsec->trust = rdataset->trust;
+ nsec->private1 = rdataset->private1;
+ nsec->private2 = rdataset->private2;
+ nsec->private3 = noqname->neg;
+ nsec->privateuint4 = 0;
+ nsec->private5 = NULL;
+ nsec->private6 = NULL;
+ nsec->private7 = NULL;
+
+ cloned_node = NULL;
+ attachnode(db, node, &cloned_node);
+ nsecsig->methods = &slab_methods;
+ nsecsig->rdclass = db->rdclass;
+ nsecsig->type = dns_rdatatype_rrsig;
+ nsecsig->covers = noqname->type;
+ nsecsig->ttl = rdataset->ttl;
+ nsecsig->trust = rdataset->trust;
+ nsecsig->private1 = rdataset->private1;
+ nsecsig->private2 = rdataset->private2;
+ nsecsig->private3 = noqname->negsig;
+ nsecsig->privateuint4 = 0;
+ nsecsig->private5 = NULL;
+ nsec->private6 = NULL;
+ nsec->private7 = NULL;
+
+ dns_name_clone(&noqname->name, name);
+
+ return (ISC_R_SUCCESS);
+}
+
+static isc_result_t
+rdataset_getclosest(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;
+ const struct noqname *closest = rdataset->private7;
+
+ cloned_node = NULL;
+ attachnode(db, node, &cloned_node);
+ nsec->methods = &slab_methods;
+ nsec->rdclass = db->rdclass;
+ nsec->type = closest->type;
+ nsec->covers = 0;
+ nsec->ttl = rdataset->ttl;
+ nsec->trust = rdataset->trust;
+ nsec->private1 = rdataset->private1;
+ nsec->private2 = rdataset->private2;
+ nsec->private3 = closest->neg;
+ nsec->privateuint4 = 0;
+ nsec->private5 = NULL;
+ nsec->private6 = NULL;
+ nsec->private7 = NULL;
+
+ cloned_node = NULL;
+ attachnode(db, node, &cloned_node);
+ nsecsig->methods = &slab_methods;
+ nsecsig->rdclass = db->rdclass;
+ nsecsig->type = dns_rdatatype_rrsig;
+ nsecsig->covers = closest->type;
+ nsecsig->ttl = rdataset->ttl;
+ nsecsig->trust = rdataset->trust;
+ nsecsig->private1 = rdataset->private1;
+ nsecsig->private2 = rdataset->private2;
+ nsecsig->private3 = closest->negsig;
+ nsecsig->privateuint4 = 0;
+ nsecsig->private5 = NULL;
+ nsec->private6 = NULL;
+ nsec->private7 = NULL;
+
+ dns_name_clone(&closest->name, name);
+
+ return (ISC_R_SUCCESS);
+}
+
+static void
+rdataset_settrust(dns_rdataset_t *rdataset, dns_trust_t trust) {
+ dns_rbtdb_t *rbtdb = rdataset->private1;
+ dns_rbtnode_t *rbtnode = rdataset->private2;
+ rdatasetheader_t *header = rdataset->private3;
+
+ header--;
+ NODE_LOCK(&rbtdb->node_locks[rbtnode->locknum].lock,
+ isc_rwlocktype_write);
+ header->trust = rdataset->trust = trust;
+ NODE_UNLOCK(&rbtdb->node_locks[rbtnode->locknum].lock,
+ isc_rwlocktype_write);
+}
+
+static void
+rdataset_expire(dns_rdataset_t *rdataset) {
+ dns_rbtdb_t *rbtdb = rdataset->private1;
+ dns_rbtnode_t *rbtnode = rdataset->private2;
+ rdatasetheader_t *header = rdataset->private3;
+
+ header--;
+ NODE_LOCK(&rbtdb->node_locks[rbtnode->locknum].lock,
+ isc_rwlocktype_write);
+ expire_header(rbtdb, header, false, expire_flush);
+ NODE_UNLOCK(&rbtdb->node_locks[rbtnode->locknum].lock,
+ isc_rwlocktype_write);
+}
+
+static void
+rdataset_clearprefetch(dns_rdataset_t *rdataset) {
+ dns_rbtdb_t *rbtdb = rdataset->private1;
+ dns_rbtnode_t *rbtnode = rdataset->private2;
+ rdatasetheader_t *header = rdataset->private3;
+
+ header--;
+ NODE_LOCK(&rbtdb->node_locks[rbtnode->locknum].lock,
+ isc_rwlocktype_write);
+ RDATASET_ATTR_CLR(header, RDATASET_ATTR_PREFETCH);
+ NODE_UNLOCK(&rbtdb->node_locks[rbtnode->locknum].lock,
+ isc_rwlocktype_write);
+}
+
+/*
+ * 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, false);
+ }
+ detachnode(rbtiterator->common.db, &rbtiterator->common.node);
+ isc_mem_put(rbtiterator->common.db->mctx, rbtiterator,
+ sizeof(*rbtiterator));
+
+ *iteratorp = NULL;
+}
+
+static bool
+iterator_active(dns_rbtdb_t *rbtdb, rbtdb_rdatasetiter_t *rbtiterator,
+ rdatasetheader_t *header) {
+ dns_ttl_t stale_ttl = header->rdh_ttl + rbtdb->serve_stale_ttl;
+
+ /*
+ * Is this a "this rdataset doesn't exist" record?
+ */
+ if (NONEXISTENT(header)) {
+ return (false);
+ }
+
+ /*
+ * If this is a zone or this header still active then return it.
+ */
+ if (!IS_CACHE(rbtdb) || ACTIVE(header, rbtiterator->common.now)) {
+ return (true);
+ }
+
+ /*
+ * If we are not returning stale records or the rdataset is
+ * too old don't return it.
+ */
+ if (!STALEOK(rbtiterator) || (rbtiterator->common.now > stale_ttl)) {
+ return (false);
+ }
+ return (true);
+}
+
+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 = IS_CACHE(rbtdb) ? 1 : rbtversion->serial;
+
+ NODE_LOCK(&rbtdb->node_locks[rbtnode->locknum].lock,
+ isc_rwlocktype_read);
+
+ for (header = rbtnode->data; header != NULL; header = top_next) {
+ top_next = header->next;
+ do {
+ if (EXPIREDOK(rbtiterator)) {
+ if (!NONEXISTENT(header)) {
+ break;
+ }
+ header = header->down;
+ } else if (header->serial <= serial && !IGNORE(header))
+ {
+ if (!iterator_active(rbtdb, rbtiterator,
+ header))
+ {
+ header = NULL;
+ }
+ break;
+ } else {
+ header = header->down;
+ }
+ } while (header != NULL);
+ if (header != NULL) {
+ break;
+ }
+ }
+
+ NODE_UNLOCK(&rbtdb->node_locks[rbtnode->locknum].lock,
+ isc_rwlocktype_read);
+
+ 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 = IS_CACHE(rbtdb) ? 1 : rbtversion->serial;
+ rbtdb_rdatatype_t type, negtype;
+ dns_rdatatype_t rdtype, covers;
+ bool expiredok = EXPIREDOK(rbtiterator);
+
+ header = rbtiterator->current;
+ if (header == NULL) {
+ return (ISC_R_NOMORE);
+ }
+
+ NODE_LOCK(&rbtdb->node_locks[rbtnode->locknum].lock,
+ isc_rwlocktype_read);
+
+ type = header->type;
+ rdtype = RBTDB_RDATATYPE_BASE(header->type);
+ if (NEGATIVE(header)) {
+ covers = RBTDB_RDATATYPE_EXT(header->type);
+ negtype = RBTDB_RDATATYPE_VALUE(covers, 0);
+ } else {
+ negtype = RBTDB_RDATATYPE_VALUE(0, rdtype);
+ }
+
+ /*
+ * Find the start of the header chain for the next type
+ * by walking back up the list.
+ */
+ top_next = header->next;
+ while (top_next != NULL &&
+ (top_next->type == type || top_next->type == negtype))
+ {
+ top_next = top_next->next;
+ }
+ if (expiredok) {
+ /*
+ * Keep walking down the list if possible or
+ * start the next type.
+ */
+ header = header->down != NULL ? header->down : top_next;
+ } else {
+ header = top_next;
+ }
+ for (; header != NULL; header = top_next) {
+ top_next = header->next;
+ do {
+ if (expiredok) {
+ if (!NONEXISTENT(header)) {
+ break;
+ }
+ header = header->down;
+ } else if (header->serial <= serial && !IGNORE(header))
+ {
+ if (!iterator_active(rbtdb, rbtiterator,
+ header))
+ {
+ header = NULL;
+ }
+ break;
+ } else {
+ header = header->down;
+ }
+ } while (header != NULL);
+ if (header != NULL) {
+ break;
+ }
+ /*
+ * Find the start of the header chain for the next type
+ * by walking back up the list.
+ */
+ while (top_next != NULL &&
+ (top_next->type == type || top_next->type == negtype))
+ {
+ top_next = top_next->next;
+ }
+ }
+
+ NODE_UNLOCK(&rbtdb->node_locks[rbtnode->locknum].lock,
+ isc_rwlocktype_read);
+
+ 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);
+
+ NODE_LOCK(&rbtdb->node_locks[rbtnode->locknum].lock,
+ isc_rwlocktype_read);
+
+ bind_rdataset(rbtdb, rbtnode, header, rbtiterator->common.now,
+ isc_rwlocktype_read, rdataset);
+
+ NODE_UNLOCK(&rbtdb->node_locks[rbtnode->locknum].lock,
+ isc_rwlocktype_read);
+}
+
+/*
+ * Database Iterator Methods
+ */
+
+static 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);
+ reactivate_node(rbtdb, node, rbtdbiter->tree_locked);
+}
+
+static void
+dereference_iter_node(rbtdb_dbiterator_t *rbtdbiter) {
+ dns_rbtdb_t *rbtdb = (dns_rbtdb_t *)rbtdbiter->common.db;
+ dns_rbtnode_t *node = rbtdbiter->node;
+ nodelock_t *lock;
+
+ if (node == NULL) {
+ return;
+ }
+
+ lock = &rbtdb->node_locks[node->locknum].lock;
+ NODE_LOCK(lock, isc_rwlocktype_read);
+ decrement_reference(rbtdb, node, 0, isc_rwlocktype_read,
+ rbtdbiter->tree_locked, false);
+ NODE_UNLOCK(lock, isc_rwlocktype_read);
+
+ 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;
+ bool was_read_locked = false;
+ nodelock_t *lock;
+ int i;
+
+ if (rbtdbiter->delcnt != 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 occurrence 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->delcnt,
+ dns_rbt_nodecount(rbtdb->tree));
+
+ if (rbtdbiter->tree_locked == isc_rwlocktype_read) {
+ RWUNLOCK(&rbtdb->tree_lock, isc_rwlocktype_read);
+ was_read_locked = true;
+ }
+ RWLOCK(&rbtdb->tree_lock, isc_rwlocktype_write);
+ rbtdbiter->tree_locked = isc_rwlocktype_write;
+
+ for (i = 0; i < rbtdbiter->delcnt; i++) {
+ node = rbtdbiter->deletions[i];
+ lock = &rbtdb->node_locks[node->locknum].lock;
+
+ NODE_LOCK(lock, isc_rwlocktype_read);
+ decrement_reference(rbtdb, node, 0, isc_rwlocktype_read,
+ rbtdbiter->tree_locked, false);
+ NODE_UNLOCK(lock, isc_rwlocktype_read);
+ }
+
+ rbtdbiter->delcnt = 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 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 = 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);
+ dns_rbtnodechain_reset(&rbtdbiter->nsec3chain);
+ 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_NOTFOUND &&
+ rbtdbiter->result != DNS_R_PARTIALMATCH &&
+ 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);
+ dns_rbtnodechain_reset(&rbtdbiter->nsec3chain);
+
+ if (rbtdbiter->nsec3only) {
+ rbtdbiter->current = &rbtdbiter->nsec3chain;
+ result = dns_rbtnodechain_first(rbtdbiter->current,
+ rbtdb->nsec3, name, origin);
+ } else {
+ rbtdbiter->current = &rbtdbiter->chain;
+ result = dns_rbtnodechain_first(rbtdbiter->current, rbtdb->tree,
+ name, origin);
+ if (!rbtdbiter->nonsec3 && result == ISC_R_NOTFOUND) {
+ rbtdbiter->current = &rbtdbiter->nsec3chain;
+ result = dns_rbtnodechain_first(
+ rbtdbiter->current, rbtdb->nsec3, name, origin);
+ }
+ }
+ if (result == ISC_R_SUCCESS || result == DNS_R_NEWORIGIN) {
+ result = dns_rbtnodechain_current(rbtdbiter->current, NULL,
+ NULL, &rbtdbiter->node);
+ if (result == ISC_R_SUCCESS) {
+ rbtdbiter->new_origin = true;
+ reference_iter_node(rbtdbiter);
+ }
+ } else {
+ INSIST(result == ISC_R_NOTFOUND);
+ result = ISC_R_NOMORE; /* The tree is empty. */
+ }
+
+ rbtdbiter->result = result;
+
+ if (result != ISC_R_SUCCESS) {
+ ENSURE(!rbtdbiter->paused);
+ }
+
+ 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_NOTFOUND &&
+ rbtdbiter->result != DNS_R_PARTIALMATCH &&
+ 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);
+ dns_rbtnodechain_reset(&rbtdbiter->nsec3chain);
+
+ result = ISC_R_NOTFOUND;
+ if (rbtdbiter->nsec3only && !rbtdbiter->nonsec3) {
+ rbtdbiter->current = &rbtdbiter->nsec3chain;
+ result = dns_rbtnodechain_last(rbtdbiter->current, rbtdb->nsec3,
+ name, origin);
+ }
+ if (!rbtdbiter->nsec3only && result == ISC_R_NOTFOUND) {
+ rbtdbiter->current = &rbtdbiter->chain;
+ result = dns_rbtnodechain_last(rbtdbiter->current, rbtdb->tree,
+ name, origin);
+ }
+ if (result == ISC_R_SUCCESS || result == DNS_R_NEWORIGIN) {
+ result = dns_rbtnodechain_current(rbtdbiter->current, NULL,
+ NULL, &rbtdbiter->node);
+ if (result == ISC_R_SUCCESS) {
+ rbtdbiter->new_origin = 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, const dns_name_t *name) {
+ isc_result_t result, tresult;
+ 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_NOTFOUND &&
+ rbtdbiter->result != DNS_R_PARTIALMATCH &&
+ 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);
+ dns_rbtnodechain_reset(&rbtdbiter->nsec3chain);
+
+ if (rbtdbiter->nsec3only) {
+ rbtdbiter->current = &rbtdbiter->nsec3chain;
+ result = dns_rbt_findnode(rbtdb->nsec3, name, NULL,
+ &rbtdbiter->node, rbtdbiter->current,
+ DNS_RBTFIND_EMPTYDATA, NULL, NULL);
+ } else if (rbtdbiter->nonsec3) {
+ rbtdbiter->current = &rbtdbiter->chain;
+ result = dns_rbt_findnode(rbtdb->tree, name, NULL,
+ &rbtdbiter->node, rbtdbiter->current,
+ DNS_RBTFIND_EMPTYDATA, NULL, NULL);
+ } else {
+ /*
+ * Stay on main chain if not found on either chain.
+ */
+ rbtdbiter->current = &rbtdbiter->chain;
+ result = dns_rbt_findnode(rbtdb->tree, name, NULL,
+ &rbtdbiter->node, rbtdbiter->current,
+ DNS_RBTFIND_EMPTYDATA, NULL, NULL);
+ if (result == DNS_R_PARTIALMATCH) {
+ dns_rbtnode_t *node = NULL;
+ tresult = dns_rbt_findnode(
+ rbtdb->nsec3, name, NULL, &node,
+ &rbtdbiter->nsec3chain, DNS_RBTFIND_EMPTYDATA,
+ NULL, NULL);
+ if (tresult == ISC_R_SUCCESS) {
+ rbtdbiter->node = node;
+ rbtdbiter->current = &rbtdbiter->nsec3chain;
+ result = tresult;
+ }
+ }
+ }
+
+ if (result == ISC_R_SUCCESS || result == DNS_R_PARTIALMATCH) {
+ tresult = dns_rbtnodechain_current(rbtdbiter->current, iname,
+ origin, NULL);
+ if (tresult == ISC_R_SUCCESS) {
+ rbtdbiter->new_origin = true;
+ reference_iter_node(rbtdbiter);
+ } else {
+ result = tresult;
+ rbtdbiter->node = NULL;
+ }
+ } else {
+ rbtdbiter->node = NULL;
+ }
+
+ rbtdbiter->result = (result == DNS_R_PARTIALMATCH) ? ISC_R_SUCCESS
+ : 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;
+ dns_rbtdb_t *rbtdb = (dns_rbtdb_t *)iterator->db;
+
+ 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->current, name, origin);
+ if (result == ISC_R_NOMORE && !rbtdbiter->nsec3only &&
+ !rbtdbiter->nonsec3 && &rbtdbiter->nsec3chain == rbtdbiter->current)
+ {
+ rbtdbiter->current = &rbtdbiter->chain;
+ dns_rbtnodechain_reset(rbtdbiter->current);
+ result = dns_rbtnodechain_last(rbtdbiter->current, rbtdb->tree,
+ name, origin);
+ if (result == ISC_R_NOTFOUND) {
+ result = ISC_R_NOMORE;
+ }
+ }
+
+ dereference_iter_node(rbtdbiter);
+
+ if (result == DNS_R_NEWORIGIN || result == ISC_R_SUCCESS) {
+ rbtdbiter->new_origin = (result == DNS_R_NEWORIGIN);
+ result = dns_rbtnodechain_current(rbtdbiter->current, 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;
+ dns_rbtdb_t *rbtdb = (dns_rbtdb_t *)iterator->db;
+
+ 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->current, name, origin);
+ if (result == ISC_R_NOMORE && !rbtdbiter->nsec3only &&
+ !rbtdbiter->nonsec3 && &rbtdbiter->chain == rbtdbiter->current)
+ {
+ rbtdbiter->current = &rbtdbiter->nsec3chain;
+ dns_rbtnodechain_reset(rbtdbiter->current);
+ result = dns_rbtnodechain_first(rbtdbiter->current,
+ rbtdb->nsec3, name, origin);
+ if (result == ISC_R_NOTFOUND) {
+ result = ISC_R_NOMORE;
+ }
+ }
+
+ dereference_iter_node(rbtdbiter);
+
+ if (result == DNS_R_NEWORIGIN || result == ISC_R_SUCCESS) {
+ rbtdbiter->new_origin = (result == DNS_R_NEWORIGIN);
+ result = dns_rbtnodechain_current(rbtdbiter->current, 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;
+ }
+
+ new_reference(rbtdb, node, isc_rwlocktype_none);
+
+ *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->delcnt == 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->delcnt++] = node;
+ isc_refcount_increment(&node->references);
+ }
+ }
+
+ 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_NOTFOUND &&
+ rbtdbiter->result != DNS_R_PARTIALMATCH &&
+ rbtdbiter->result != ISC_R_NOMORE)
+ {
+ return (rbtdbiter->result);
+ }
+
+ if (rbtdbiter->paused) {
+ return (ISC_R_SUCCESS);
+ }
+
+ rbtdbiter->paused = 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);
+ }
+
+ dns_name_copynf(origin, name);
+ return (ISC_R_SUCCESS);
+}
+
+static void
+setownercase(rdatasetheader_t *header, const dns_name_t *name) {
+ unsigned int i;
+ bool fully_lower;
+
+ /*
+ * We do not need to worry about label lengths as they are all
+ * less than or equal to 63.
+ */
+ memset(header->upper, 0, sizeof(header->upper));
+ fully_lower = true;
+ for (i = 0; i < name->length; i++) {
+ if (isupper(name->ndata[i])) {
+ header->upper[i / 8] |= 1 << (i % 8);
+ fully_lower = false;
+ }
+ }
+ RDATASET_ATTR_SET(header, RDATASET_ATTR_CASESET);
+ if (ISC_LIKELY(fully_lower)) {
+ RDATASET_ATTR_SET(header, RDATASET_ATTR_CASEFULLYLOWER);
+ }
+}
+
+static void
+rdataset_setownercase(dns_rdataset_t *rdataset, const dns_name_t *name) {
+ dns_rbtdb_t *rbtdb = rdataset->private1;
+ dns_rbtnode_t *rbtnode = rdataset->private2;
+ unsigned char *raw = rdataset->private3; /* RDATASLAB */
+ rdatasetheader_t *header;
+
+ header = (struct rdatasetheader *)(raw - sizeof(*header));
+
+ NODE_LOCK(&rbtdb->node_locks[rbtnode->locknum].lock,
+ isc_rwlocktype_write);
+ setownercase(header, name);
+ NODE_UNLOCK(&rbtdb->node_locks[rbtnode->locknum].lock,
+ isc_rwlocktype_write);
+}
+
+static void
+rdataset_getownercase(const dns_rdataset_t *rdataset, dns_name_t *name) {
+ dns_rbtdb_t *rbtdb = rdataset->private1;
+ dns_rbtnode_t *rbtnode = rdataset->private2;
+ unsigned char *raw = rdataset->private3; /* RDATASLAB */
+ rdatasetheader_t *header = NULL;
+ uint8_t mask = (1 << 7);
+ uint8_t bits = 0;
+
+ header = (struct rdatasetheader *)(raw - sizeof(*header));
+
+ NODE_LOCK(&rbtdb->node_locks[rbtnode->locknum].lock,
+ isc_rwlocktype_read);
+
+ if (!CASESET(header)) {
+ goto unlock;
+ }
+
+ if (ISC_LIKELY(CASEFULLYLOWER(header))) {
+ for (size_t i = 0; i < name->length; i++) {
+ name->ndata[i] = tolower(name->ndata[i]);
+ }
+ } else {
+ for (size_t i = 0; i < name->length; i++) {
+ if (mask == (1 << 7)) {
+ bits = header->upper[i / 8];
+ mask = 1;
+ } else {
+ mask <<= 1;
+ }
+
+ name->ndata[i] = ((bits & mask) != 0)
+ ? toupper(name->ndata[i])
+ : tolower(name->ndata[i]);
+ }
+ }
+
+unlock:
+ NODE_UNLOCK(&rbtdb->node_locks[rbtnode->locknum].lock,
+ isc_rwlocktype_read);
+}
+
+struct rbtdb_glue {
+ struct rbtdb_glue *next;
+ dns_fixedname_t fixedname;
+ dns_rdataset_t rdataset_a;
+ dns_rdataset_t sigrdataset_a;
+ dns_rdataset_t rdataset_aaaa;
+ dns_rdataset_t sigrdataset_aaaa;
+};
+
+typedef struct {
+ rbtdb_glue_t *glue_list;
+ dns_rbtdb_t *rbtdb;
+ rbtdb_version_t *rbtversion;
+} rbtdb_glue_additionaldata_ctx_t;
+
+static void
+free_gluelist(rbtdb_glue_t *glue_list, dns_rbtdb_t *rbtdb) {
+ rbtdb_glue_t *cur, *cur_next;
+
+ if (glue_list == (void *)-1) {
+ return;
+ }
+
+ cur = glue_list;
+ while (cur != NULL) {
+ cur_next = cur->next;
+
+ if (dns_rdataset_isassociated(&cur->rdataset_a)) {
+ dns_rdataset_disassociate(&cur->rdataset_a);
+ }
+ if (dns_rdataset_isassociated(&cur->sigrdataset_a)) {
+ dns_rdataset_disassociate(&cur->sigrdataset_a);
+ }
+
+ if (dns_rdataset_isassociated(&cur->rdataset_aaaa)) {
+ dns_rdataset_disassociate(&cur->rdataset_aaaa);
+ }
+ if (dns_rdataset_isassociated(&cur->sigrdataset_aaaa)) {
+ dns_rdataset_disassociate(&cur->sigrdataset_aaaa);
+ }
+
+ dns_rdataset_invalidate(&cur->rdataset_a);
+ dns_rdataset_invalidate(&cur->sigrdataset_a);
+ dns_rdataset_invalidate(&cur->rdataset_aaaa);
+ dns_rdataset_invalidate(&cur->sigrdataset_aaaa);
+
+ isc_mem_put(rbtdb->common.mctx, cur, sizeof(*cur));
+ cur = cur_next;
+ }
+}
+
+static void
+free_gluetable(rbtdb_version_t *version) {
+ dns_rbtdb_t *rbtdb;
+ size_t size, i;
+
+ RWLOCK(&version->glue_rwlock, isc_rwlocktype_write);
+
+ rbtdb = version->rbtdb;
+
+ for (i = 0; i < HASHSIZE(version->glue_table_bits); i++) {
+ rbtdb_glue_table_node_t *cur, *cur_next;
+
+ cur = version->glue_table[i];
+ while (cur != NULL) {
+ cur_next = cur->next;
+ /* isc_refcount_decrement(&cur->node->references); */
+ cur->node = NULL;
+ free_gluelist(cur->glue_list, rbtdb);
+ cur->glue_list = NULL;
+ isc_mem_put(rbtdb->common.mctx, cur, sizeof(*cur));
+ cur = cur_next;
+ }
+ version->glue_table[i] = NULL;
+ }
+
+ size = HASHSIZE(version->glue_table_bits) *
+ sizeof(*version->glue_table);
+ isc_mem_put(rbtdb->common.mctx, version->glue_table, size);
+
+ RWUNLOCK(&version->glue_rwlock, isc_rwlocktype_write);
+}
+
+static uint32_t
+rehash_bits(rbtdb_version_t *version, size_t newcount) {
+ uint32_t oldbits = version->glue_table_bits;
+ uint32_t newbits = oldbits;
+
+ while (newcount >= HASHSIZE(newbits) &&
+ newbits <= RBTDB_GLUE_TABLE_MAX_BITS)
+ {
+ newbits += 1;
+ }
+
+ return (newbits);
+}
+
+/*%
+ * Write lock (version->glue_rwlock) must be held.
+ */
+static void
+rehash_gluetable(rbtdb_version_t *version) {
+ uint32_t oldbits, newbits;
+ size_t newsize, oldcount, i;
+ rbtdb_glue_table_node_t **oldtable;
+
+ oldbits = version->glue_table_bits;
+ oldcount = HASHSIZE(oldbits);
+ oldtable = version->glue_table;
+
+ newbits = rehash_bits(version, version->glue_table_nodecount);
+ newsize = HASHSIZE(newbits) * sizeof(version->glue_table[0]);
+
+ version->glue_table = isc_mem_get(version->rbtdb->common.mctx, newsize);
+ version->glue_table_bits = newbits;
+ memset(version->glue_table, 0, newsize);
+
+ for (i = 0; i < oldcount; i++) {
+ rbtdb_glue_table_node_t *gluenode;
+ rbtdb_glue_table_node_t *nextgluenode;
+ for (gluenode = oldtable[i]; gluenode != NULL;
+ gluenode = nextgluenode)
+ {
+ uint32_t hash = isc_hash32(
+ &gluenode->node, sizeof(gluenode->node), true);
+ uint32_t idx = hash_32(hash, newbits);
+ nextgluenode = gluenode->next;
+ gluenode->next = version->glue_table[idx];
+ version->glue_table[idx] = gluenode;
+ }
+ }
+
+ isc_mem_put(version->rbtdb->common.mctx, oldtable,
+ oldcount * sizeof(*version->glue_table));
+
+ isc_log_write(dns_lctx, DNS_LOGCATEGORY_DATABASE, DNS_LOGMODULE_ZONE,
+ ISC_LOG_DEBUG(3),
+ "rehash_gluetable(): "
+ "resized glue table from %zu to "
+ "%zu",
+ oldcount, newsize / sizeof(version->glue_table[0]));
+}
+
+static void
+maybe_rehash_gluetable(rbtdb_version_t *version) {
+ size_t overcommit = HASHSIZE(version->glue_table_bits) *
+ RBTDB_GLUE_TABLE_OVERCOMMIT;
+ if (ISC_LIKELY(version->glue_table_nodecount < overcommit)) {
+ return;
+ }
+
+ rehash_gluetable(version);
+}
+
+static isc_result_t
+glue_nsdname_cb(void *arg, const dns_name_t *name, dns_rdatatype_t qtype) {
+ rbtdb_glue_additionaldata_ctx_t *ctx;
+ isc_result_t result;
+ dns_fixedname_t fixedname_a;
+ dns_name_t *name_a = NULL;
+ dns_rdataset_t rdataset_a, sigrdataset_a;
+ dns_rbtnode_t *node_a = NULL;
+ dns_fixedname_t fixedname_aaaa;
+ dns_name_t *name_aaaa = NULL;
+ dns_rdataset_t rdataset_aaaa, sigrdataset_aaaa;
+ dns_rbtnode_t *node_aaaa = NULL;
+ rbtdb_glue_t *glue = NULL;
+ dns_name_t *gluename = NULL;
+
+ /*
+ * NS records want addresses in additional records.
+ */
+ INSIST(qtype == dns_rdatatype_a);
+
+ ctx = (rbtdb_glue_additionaldata_ctx_t *)arg;
+
+ name_a = dns_fixedname_initname(&fixedname_a);
+ dns_rdataset_init(&rdataset_a);
+ dns_rdataset_init(&sigrdataset_a);
+
+ name_aaaa = dns_fixedname_initname(&fixedname_aaaa);
+ dns_rdataset_init(&rdataset_aaaa);
+ dns_rdataset_init(&sigrdataset_aaaa);
+
+ result = zone_find((dns_db_t *)ctx->rbtdb, name, ctx->rbtversion,
+ dns_rdatatype_a, DNS_DBFIND_GLUEOK, 0,
+ (dns_dbnode_t **)&node_a, name_a, &rdataset_a,
+ &sigrdataset_a);
+ if (result == DNS_R_GLUE) {
+ glue = isc_mem_get(ctx->rbtdb->common.mctx, sizeof(*glue));
+
+ gluename = dns_fixedname_initname(&glue->fixedname);
+ dns_name_copynf(name_a, gluename);
+
+ dns_rdataset_init(&glue->rdataset_a);
+ dns_rdataset_init(&glue->sigrdataset_a);
+ dns_rdataset_init(&glue->rdataset_aaaa);
+ dns_rdataset_init(&glue->sigrdataset_aaaa);
+
+ dns_rdataset_clone(&rdataset_a, &glue->rdataset_a);
+ if (dns_rdataset_isassociated(&sigrdataset_a)) {
+ dns_rdataset_clone(&sigrdataset_a,
+ &glue->sigrdataset_a);
+ }
+ }
+
+ result = zone_find((dns_db_t *)ctx->rbtdb, name, ctx->rbtversion,
+ dns_rdatatype_aaaa, DNS_DBFIND_GLUEOK, 0,
+ (dns_dbnode_t **)&node_aaaa, name_aaaa,
+ &rdataset_aaaa, &sigrdataset_aaaa);
+ if (result == DNS_R_GLUE) {
+ if (glue == NULL) {
+ glue = isc_mem_get(ctx->rbtdb->common.mctx,
+ sizeof(*glue));
+
+ gluename = dns_fixedname_initname(&glue->fixedname);
+ dns_name_copynf(name_aaaa, gluename);
+
+ dns_rdataset_init(&glue->rdataset_a);
+ dns_rdataset_init(&glue->sigrdataset_a);
+ dns_rdataset_init(&glue->rdataset_aaaa);
+ dns_rdataset_init(&glue->sigrdataset_aaaa);
+ } else {
+ INSIST(node_a == node_aaaa);
+ INSIST(dns_name_equal(name_a, name_aaaa));
+ }
+
+ dns_rdataset_clone(&rdataset_aaaa, &glue->rdataset_aaaa);
+ if (dns_rdataset_isassociated(&sigrdataset_aaaa)) {
+ dns_rdataset_clone(&sigrdataset_aaaa,
+ &glue->sigrdataset_aaaa);
+ }
+ }
+
+ if (glue != NULL) {
+ glue->next = ctx->glue_list;
+ ctx->glue_list = glue;
+ }
+
+ result = ISC_R_SUCCESS;
+
+ if (dns_rdataset_isassociated(&rdataset_a)) {
+ rdataset_disassociate(&rdataset_a);
+ }
+ if (dns_rdataset_isassociated(&sigrdataset_a)) {
+ rdataset_disassociate(&sigrdataset_a);
+ }
+
+ if (dns_rdataset_isassociated(&rdataset_aaaa)) {
+ rdataset_disassociate(&rdataset_aaaa);
+ }
+ if (dns_rdataset_isassociated(&sigrdataset_aaaa)) {
+ rdataset_disassociate(&sigrdataset_aaaa);
+ }
+
+ if (node_a != NULL) {
+ detachnode((dns_db_t *)ctx->rbtdb, (dns_dbnode_t *)&node_a);
+ }
+ if (node_aaaa != NULL) {
+ detachnode((dns_db_t *)ctx->rbtdb, (dns_dbnode_t *)&node_aaaa);
+ }
+
+ return (result);
+}
+
+static isc_result_t
+rdataset_addglue(dns_rdataset_t *rdataset, dns_dbversion_t *version,
+ dns_message_t *msg) {
+ dns_rbtdb_t *rbtdb = rdataset->private1;
+ dns_rbtnode_t *node = rdataset->private2;
+ rbtdb_version_t *rbtversion = version;
+ uint32_t idx;
+ rbtdb_glue_table_node_t *cur;
+ bool found = false;
+ bool restarted = false;
+ rbtdb_glue_t *ge;
+ rbtdb_glue_additionaldata_ctx_t ctx;
+ isc_result_t result;
+ uint64_t hash;
+
+ REQUIRE(rdataset->type == dns_rdatatype_ns);
+ REQUIRE(rbtdb == rbtversion->rbtdb);
+ REQUIRE(!IS_CACHE(rbtdb) && !IS_STUB(rbtdb));
+
+ /*
+ * The glue table cache that forms a part of the DB version
+ * structure is not explicitly bounded and there's no cache
+ * cleaning. The zone data size itself is an implicit bound.
+ *
+ * The key into the glue hashtable is the node pointer. This is
+ * because the glue hashtable is a property of the DB version,
+ * and the glue is keyed for the ownername/NS tuple. We don't
+ * bother with using an expensive dns_name_t comparison here as
+ * the node pointer is a fixed value that won't change for a DB
+ * version and can be compared directly.
+ */
+ hash = isc_hash_function(&node, sizeof(node), true);
+
+restart:
+ /*
+ * First, check if we have the additional entries already cached
+ * in the glue table.
+ */
+ RWLOCK(&rbtversion->glue_rwlock, isc_rwlocktype_read);
+
+ idx = hash_32(hash, rbtversion->glue_table_bits);
+
+ for (cur = rbtversion->glue_table[idx]; cur != NULL; cur = cur->next) {
+ if (cur->node == node) {
+ break;
+ }
+ }
+
+ if (cur == NULL) {
+ goto no_glue;
+ }
+ /*
+ * We found a cached result. Add it to the message and
+ * return.
+ */
+ found = true;
+ ge = cur->glue_list;
+
+ /*
+ * (void *) -1 is a special value that means no glue is
+ * present in the zone.
+ */
+ if (ge == (void *)-1) {
+ if (!restarted && (rbtdb->gluecachestats != NULL)) {
+ isc_stats_increment(
+ rbtdb->gluecachestats,
+ dns_gluecachestatscounter_hits_absent);
+ }
+ goto no_glue;
+ } else {
+ if (!restarted && (rbtdb->gluecachestats != NULL)) {
+ isc_stats_increment(
+ rbtdb->gluecachestats,
+ dns_gluecachestatscounter_hits_present);
+ }
+ }
+
+ for (; ge != NULL; ge = ge->next) {
+ dns_name_t *name = NULL;
+ dns_rdataset_t *rdataset_a = NULL;
+ dns_rdataset_t *sigrdataset_a = NULL;
+ dns_rdataset_t *rdataset_aaaa = NULL;
+ dns_rdataset_t *sigrdataset_aaaa = NULL;
+ dns_name_t *gluename = dns_fixedname_name(&ge->fixedname);
+
+ result = dns_message_gettempname(msg, &name);
+ if (ISC_UNLIKELY(result != ISC_R_SUCCESS)) {
+ goto no_glue;
+ }
+
+ dns_name_copynf(gluename, name);
+
+ if (dns_rdataset_isassociated(&ge->rdataset_a)) {
+ result = dns_message_gettemprdataset(msg, &rdataset_a);
+ if (ISC_UNLIKELY(result != ISC_R_SUCCESS)) {
+ dns_message_puttempname(msg, &name);
+ goto no_glue;
+ }
+ }
+
+ if (dns_rdataset_isassociated(&ge->sigrdataset_a)) {
+ result = dns_message_gettemprdataset(msg,
+ &sigrdataset_a);
+ if (ISC_UNLIKELY(result != ISC_R_SUCCESS)) {
+ if (rdataset_a != NULL) {
+ dns_message_puttemprdataset(
+ msg, &rdataset_a);
+ }
+ dns_message_puttempname(msg, &name);
+ goto no_glue;
+ }
+ }
+
+ if (dns_rdataset_isassociated(&ge->rdataset_aaaa)) {
+ result = dns_message_gettemprdataset(msg,
+ &rdataset_aaaa);
+ if (ISC_UNLIKELY(result != ISC_R_SUCCESS)) {
+ dns_message_puttempname(msg, &name);
+ if (rdataset_a != NULL) {
+ dns_message_puttemprdataset(
+ msg, &rdataset_a);
+ }
+ if (sigrdataset_a != NULL) {
+ dns_message_puttemprdataset(
+ msg, &sigrdataset_a);
+ }
+ goto no_glue;
+ }
+ }
+
+ if (dns_rdataset_isassociated(&ge->sigrdataset_aaaa)) {
+ result = dns_message_gettemprdataset(msg,
+ &sigrdataset_aaaa);
+ if (ISC_UNLIKELY(result != ISC_R_SUCCESS)) {
+ dns_message_puttempname(msg, &name);
+ if (rdataset_a != NULL) {
+ dns_message_puttemprdataset(
+ msg, &rdataset_a);
+ }
+ if (sigrdataset_a != NULL) {
+ dns_message_puttemprdataset(
+ msg, &sigrdataset_a);
+ }
+ if (rdataset_aaaa != NULL) {
+ dns_message_puttemprdataset(
+ msg, &rdataset_aaaa);
+ }
+ goto no_glue;
+ }
+ }
+
+ if (ISC_LIKELY(rdataset_a != NULL)) {
+ dns_rdataset_clone(&ge->rdataset_a, rdataset_a);
+ ISC_LIST_APPEND(name->list, rdataset_a, link);
+ }
+
+ if (sigrdataset_a != NULL) {
+ dns_rdataset_clone(&ge->sigrdataset_a, sigrdataset_a);
+ ISC_LIST_APPEND(name->list, sigrdataset_a, link);
+ }
+
+ if (rdataset_aaaa != NULL) {
+ dns_rdataset_clone(&ge->rdataset_aaaa, rdataset_aaaa);
+ ISC_LIST_APPEND(name->list, rdataset_aaaa, link);
+ }
+ if (sigrdataset_aaaa != NULL) {
+ dns_rdataset_clone(&ge->sigrdataset_aaaa,
+ sigrdataset_aaaa);
+ ISC_LIST_APPEND(name->list, sigrdataset_aaaa, link);
+ }
+
+ dns_message_addname(msg, name, DNS_SECTION_ADDITIONAL);
+ }
+
+no_glue:
+ RWUNLOCK(&rbtversion->glue_rwlock, isc_rwlocktype_read);
+
+ if (found) {
+ return (ISC_R_SUCCESS);
+ }
+
+ if (restarted) {
+ return (ISC_R_FAILURE);
+ }
+
+ /*
+ * No cached glue was found in the table. Cache it and restart
+ * this function.
+ *
+ * Due to the gap between the read lock and the write lock, it's
+ * possible that we may cache a duplicate glue table entry, but
+ * we don't care.
+ */
+
+ ctx.glue_list = NULL;
+ ctx.rbtdb = rbtdb;
+ ctx.rbtversion = rbtversion;
+
+ RWLOCK(&rbtversion->glue_rwlock, isc_rwlocktype_write);
+
+ maybe_rehash_gluetable(rbtversion);
+ idx = hash_32(hash, rbtversion->glue_table_bits);
+
+ (void)dns_rdataset_additionaldata(rdataset, glue_nsdname_cb, &ctx);
+
+ cur = isc_mem_get(rbtdb->common.mctx, sizeof(*cur));
+
+ /*
+ * XXXMUKS: it looks like the dns_dbversion is not destroyed
+ * when named is terminated by a keyboard break. This doesn't
+ * cleanup the node reference and keeps the process dangling.
+ */
+ /* isc_refcount_increment0(&node->references); */
+ cur->node = node;
+
+ if (ctx.glue_list == NULL) {
+ /*
+ * No glue was found. Cache it so.
+ */
+ cur->glue_list = (void *)-1;
+ if (rbtdb->gluecachestats != NULL) {
+ isc_stats_increment(
+ rbtdb->gluecachestats,
+ dns_gluecachestatscounter_inserts_absent);
+ }
+ } else {
+ cur->glue_list = ctx.glue_list;
+ if (rbtdb->gluecachestats != NULL) {
+ isc_stats_increment(
+ rbtdb->gluecachestats,
+ dns_gluecachestatscounter_inserts_present);
+ }
+ }
+
+ cur->next = rbtversion->glue_table[idx];
+ rbtversion->glue_table[idx] = cur;
+ rbtversion->glue_table_nodecount++;
+
+ RWUNLOCK(&rbtversion->glue_rwlock, isc_rwlocktype_write);
+
+ restarted = true;
+ goto restart;
+
+ /* UNREACHABLE */
+}
+
+/*%
+ * Routines for LRU-based cache management.
+ */
+
+/*%
+ * See if a given cache entry that is being reused needs to be updated
+ * in the LRU-list. From the LRU management point of view, this function is
+ * expected to return true for almost all cases. When used with threads,
+ * however, this may cause a non-negligible performance penalty because a
+ * writer lock will have to be acquired before updating the list.
+ * If DNS_RBTDB_LIMITLRUUPDATE is defined to be non 0 at compilation time, this
+ * function returns true if the entry has not been updated for some period of
+ * time. We differentiate the NS or glue address case and the others since
+ * experiments have shown that the former tends to be accessed relatively
+ * infrequently and the cost of cache miss is higher (e.g., a missing NS records
+ * may cause external queries at a higher level zone, involving more
+ * transactions).
+ *
+ * Caller must hold the node (read or write) lock.
+ */
+static bool
+need_headerupdate(rdatasetheader_t *header, isc_stdtime_t now) {
+ if (RDATASET_ATTR_GET(header, (RDATASET_ATTR_NONEXISTENT |
+ RDATASET_ATTR_ANCIENT |
+ RDATASET_ATTR_ZEROTTL)) != 0)
+ {
+ return (false);
+ }
+
+#if DNS_RBTDB_LIMITLRUUPDATE
+ if (header->type == dns_rdatatype_ns ||
+ (header->trust == dns_trust_glue &&
+ (header->type == dns_rdatatype_a ||
+ header->type == dns_rdatatype_aaaa)))
+ {
+ /*
+ * Glue records are updated if at least DNS_RBTDB_LRUUPDATE_GLUE
+ * seconds have passed since the previous update time.
+ */
+ return (header->last_used + DNS_RBTDB_LRUUPDATE_GLUE <= now);
+ }
+
+ /*
+ * Other records are updated if DNS_RBTDB_LRUUPDATE_REGULAR seconds
+ * have passed.
+ */
+ return (header->last_used + DNS_RBTDB_LRUUPDATE_REGULAR <= now);
+#else
+ UNUSED(now);
+
+ return (true);
+#endif /* if DNS_RBTDB_LIMITLRUUPDATE */
+}
+
+/*%
+ * Update the timestamp of a given cache entry and move it to the head
+ * of the corresponding LRU list.
+ *
+ * Caller must hold the node (write) lock.
+ *
+ * Note that the we do NOT touch the heap here, as the TTL has not changed.
+ */
+static void
+update_header(dns_rbtdb_t *rbtdb, rdatasetheader_t *header, isc_stdtime_t now) {
+ INSIST(IS_CACHE(rbtdb));
+
+ /* To be checked: can we really assume this? XXXMLG */
+ INSIST(ISC_LINK_LINKED(header, link));
+
+ ISC_LIST_UNLINK(rbtdb->rdatasets[header->node->locknum], header, link);
+ header->last_used = now;
+ ISC_LIST_PREPEND(rbtdb->rdatasets[header->node->locknum], header, link);
+}
+
+static size_t
+expire_lru_headers(dns_rbtdb_t *rbtdb, unsigned int locknum, size_t purgesize,
+ bool tree_locked) {
+ rdatasetheader_t *header, *header_prev;
+ size_t purged = 0;
+
+ for (header = ISC_LIST_TAIL(rbtdb->rdatasets[locknum]);
+ header != NULL && purged <= purgesize; header = header_prev)
+ {
+ header_prev = ISC_LIST_PREV(header, link);
+ /*
+ * Unlink the entry at this point to avoid checking it
+ * again even if it's currently used someone else and
+ * cannot be purged at this moment. This entry won't be
+ * referenced any more (so unlinking is safe) since the
+ * TTL was reset to 0.
+ */
+ ISC_LIST_UNLINK(rbtdb->rdatasets[locknum], header, link);
+ size_t header_size = rdataset_size(header);
+ expire_header(rbtdb, header, tree_locked, expire_lru);
+ purged += header_size;
+ }
+
+ return (purged);
+}
+
+/*%
+ * Purge some stale (i.e. unused for some period - LRU based cleaning) cache
+ * entries under the overmem condition. To recover from this condition quickly,
+ * we cleanup entries up to the size of newly added rdata (passed as purgesize).
+ *
+ * This process is triggered while adding a new entry, and we specifically avoid
+ * purging entries in the same LRU bucket as the one to which the new entry will
+ * belong. Otherwise, we might purge entries of the same name of different RR
+ * types while adding RRsets from a single response (consider the case where
+ * we're adding A and AAAA glue records of the same NS name).
+ */
+static void
+overmem_purge(dns_rbtdb_t *rbtdb, unsigned int locknum_start, size_t purgesize,
+ bool tree_locked) {
+ unsigned int locknum;
+ size_t purged = 0;
+
+ for (locknum = (locknum_start + 1) % rbtdb->node_lock_count;
+ locknum != locknum_start && purged <= purgesize;
+ locknum = (locknum + 1) % rbtdb->node_lock_count)
+ {
+ NODE_LOCK(&rbtdb->node_locks[locknum].lock,
+ isc_rwlocktype_write);
+
+ purged += expire_lru_headers(rbtdb, locknum, purgesize - purged,
+ tree_locked);
+
+ NODE_UNLOCK(&rbtdb->node_locks[locknum].lock,
+ isc_rwlocktype_write);
+ }
+}
+
+static void
+expire_header(dns_rbtdb_t *rbtdb, rdatasetheader_t *header, bool tree_locked,
+ expire_t reason) {
+ set_ttl(rbtdb, header, 0);
+ mark_header_ancient(rbtdb, header);
+
+ /*
+ * Caller must hold the node (write) lock.
+ */
+
+ if (isc_refcount_current(&header->node->references) == 0) {
+ /*
+ * If no one else is using the node, we can clean it up now.
+ * We first need to gain a new reference to the node to meet a
+ * requirement of decrement_reference().
+ */
+ new_reference(rbtdb, header->node, isc_rwlocktype_write);
+ decrement_reference(rbtdb, header->node, 0,
+ isc_rwlocktype_write,
+ tree_locked ? isc_rwlocktype_write
+ : isc_rwlocktype_none,
+ false);
+
+ if (rbtdb->cachestats == NULL) {
+ return;
+ }
+
+ switch (reason) {
+ case expire_ttl:
+ isc_stats_increment(rbtdb->cachestats,
+ dns_cachestatscounter_deletettl);
+ break;
+ case expire_lru:
+ isc_stats_increment(rbtdb->cachestats,
+ dns_cachestatscounter_deletelru);
+ break;
+ default:
+ break;
+ }
+ }
+}