6761 lines
176 KiB
C
6761 lines
176 KiB
C
/*
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* Copyright (C) 2004-2008 Internet Systems Consortium, Inc. ("ISC")
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* Copyright (C) 1999-2003 Internet Software Consortium.
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*
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* Permission to use, copy, modify, and/or distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
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* REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
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* AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
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* INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
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* LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
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* OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
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* PERFORMANCE OF THIS SOFTWARE.
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*/
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/* $Id: rbtdb.c,v 1.196.18.53 2008/01/31 23:46:05 tbox Exp $ */
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/*! \file */
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/*
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* Principal Author: Bob Halley
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*/
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#include <config.h>
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#include <isc/event.h>
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#include <isc/mem.h>
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#include <isc/print.h>
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#include <isc/mutex.h>
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#include <isc/random.h>
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#include <isc/refcount.h>
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#include <isc/rwlock.h>
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#include <isc/string.h>
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#include <isc/task.h>
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#include <isc/time.h>
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#include <isc/util.h>
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#include <dns/acache.h>
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#include <dns/db.h>
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#include <dns/dbiterator.h>
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#include <dns/events.h>
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#include <dns/fixedname.h>
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#include <dns/lib.h>
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#include <dns/log.h>
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#include <dns/masterdump.h>
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#include <dns/rbt.h>
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#include <dns/rdata.h>
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#include <dns/rdataset.h>
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#include <dns/rdatasetiter.h>
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#include <dns/rdataslab.h>
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#include <dns/result.h>
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#include <dns/view.h>
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#include <dns/zone.h>
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#include <dns/zonekey.h>
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#ifdef DNS_RBTDB_VERSION64
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#include "rbtdb64.h"
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#else
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#include "rbtdb.h"
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#endif
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#ifdef DNS_RBTDB_VERSION64
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#define RBTDB_MAGIC ISC_MAGIC('R', 'B', 'D', '8')
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#else
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#define RBTDB_MAGIC ISC_MAGIC('R', 'B', 'D', '4')
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#endif
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/*%
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* Note that "impmagic" is not the first four bytes of the struct, so
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* ISC_MAGIC_VALID cannot be used.
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*/
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#define VALID_RBTDB(rbtdb) ((rbtdb) != NULL && \
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(rbtdb)->common.impmagic == RBTDB_MAGIC)
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#ifdef DNS_RBTDB_VERSION64
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typedef isc_uint64_t rbtdb_serial_t;
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/*%
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* Make casting easier in symbolic debuggers by using different names
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* for the 64 bit version.
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*/
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#define dns_rbtdb_t dns_rbtdb64_t
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#define rdatasetheader_t rdatasetheader64_t
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#define rbtdb_version_t rbtdb_version64_t
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#else
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typedef isc_uint32_t rbtdb_serial_t;
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#endif
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typedef isc_uint32_t rbtdb_rdatatype_t;
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#define RBTDB_RDATATYPE_BASE(type) ((dns_rdatatype_t)((type) & 0xFFFF))
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#define RBTDB_RDATATYPE_EXT(type) ((dns_rdatatype_t)((type) >> 16))
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#define RBTDB_RDATATYPE_VALUE(b, e) (((e) << 16) | (b))
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#define RBTDB_RDATATYPE_SIGNSEC \
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RBTDB_RDATATYPE_VALUE(dns_rdatatype_rrsig, dns_rdatatype_nsec)
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#define RBTDB_RDATATYPE_SIGNS \
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RBTDB_RDATATYPE_VALUE(dns_rdatatype_rrsig, dns_rdatatype_ns)
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#define RBTDB_RDATATYPE_SIGCNAME \
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RBTDB_RDATATYPE_VALUE(dns_rdatatype_rrsig, dns_rdatatype_cname)
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#define RBTDB_RDATATYPE_SIGDNAME \
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RBTDB_RDATATYPE_VALUE(dns_rdatatype_rrsig, dns_rdatatype_dname)
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#define RBTDB_RDATATYPE_NCACHEANY \
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RBTDB_RDATATYPE_VALUE(0, dns_rdatatype_any)
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/*
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* We use rwlock for DB lock only when ISC_RWLOCK_USEATOMIC is non 0.
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* Using rwlock is effective with regard to lookup performance only when
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* it is implemented in an efficient way.
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* Otherwise, it is generally wise to stick to the simple locking since rwlock
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* would require more memory or can even make lookups slower due to its own
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* overhead (when it internally calls mutex locks).
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*/
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#ifdef ISC_RWLOCK_USEATOMIC
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#define DNS_RBTDB_USERWLOCK 1
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#else
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#define DNS_RBTDB_USERWLOCK 0
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#endif
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#if DNS_RBTDB_USERWLOCK
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#define RBTDB_INITLOCK(l) isc_rwlock_init((l), 0, 0)
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#define RBTDB_DESTROYLOCK(l) isc_rwlock_destroy(l)
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#define RBTDB_LOCK(l, t) RWLOCK((l), (t))
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#define RBTDB_UNLOCK(l, t) RWUNLOCK((l), (t))
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#else
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#define RBTDB_INITLOCK(l) isc_mutex_init(l)
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#define RBTDB_DESTROYLOCK(l) DESTROYLOCK(l)
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#define RBTDB_LOCK(l, t) LOCK(l)
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#define RBTDB_UNLOCK(l, t) UNLOCK(l)
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#endif
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/*
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* Since node locking is sensitive to both performance and memory footprint,
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* we need some trick here. If we have both high-performance rwlock and
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* high performance and small-memory reference counters, we use rwlock for
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* node lock and isc_refcount for node references. In this case, we don't have
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* to protect the access to the counters by locks.
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* Otherwise, we simply use ordinary mutex lock for node locking, and use
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* simple integers as reference counters which is protected by the lock.
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* In most cases, we can simply use wrapper macros such as NODE_LOCK and
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* NODE_UNLOCK. In some other cases, however, we need to protect reference
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* counters first and then protect other parts of a node as read-only data.
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* Special additional macros, NODE_STRONGLOCK(), NODE_WEAKLOCK(), etc, are also
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* provided for these special cases. When we can use the efficient backend
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* routines, we should only protect the "other members" by NODE_WEAKLOCK(read).
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* Otherwise, we should use NODE_STRONGLOCK() to protect the entire critical
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* section including the access to the reference counter.
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* Note that we cannot use NODE_LOCK()/NODE_UNLOCK() wherever the protected
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* section is also protected by NODE_STRONGLOCK().
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*/
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#if defined(ISC_RWLOCK_USEATOMIC) && defined(DNS_RBT_USEISCREFCOUNT)
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typedef isc_rwlock_t nodelock_t;
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#define NODE_INITLOCK(l) isc_rwlock_init((l), 0, 0)
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#define NODE_DESTROYLOCK(l) isc_rwlock_destroy(l)
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#define NODE_LOCK(l, t) RWLOCK((l), (t))
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#define NODE_UNLOCK(l, t) RWUNLOCK((l), (t))
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#define NODE_TRYUPGRADE(l) isc_rwlock_tryupgrade(l)
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#define NODE_STRONGLOCK(l) ((void)0)
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#define NODE_STRONGUNLOCK(l) ((void)0)
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#define NODE_WEAKLOCK(l, t) NODE_LOCK(l, t)
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#define NODE_WEAKUNLOCK(l, t) NODE_UNLOCK(l, t)
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#define NODE_WEAKDOWNGRADE(l) isc_rwlock_downgrade(l)
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#else
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typedef isc_mutex_t nodelock_t;
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#define NODE_INITLOCK(l) isc_mutex_init(l)
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#define NODE_DESTROYLOCK(l) DESTROYLOCK(l)
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#define NODE_LOCK(l, t) LOCK(l)
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#define NODE_UNLOCK(l, t) UNLOCK(l)
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#define NODE_TRYUPGRADE(l) ISC_R_SUCCESS
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#define NODE_STRONGLOCK(l) LOCK(l)
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#define NODE_STRONGUNLOCK(l) UNLOCK(l)
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#define NODE_WEAKLOCK(l, t) ((void)0)
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#define NODE_WEAKUNLOCK(l, t) ((void)0)
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#define NODE_WEAKDOWNGRADE(l) ((void)0)
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#endif
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#ifndef DNS_RDATASET_FIXED
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#define DNS_RDATASET_FIXED 1
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#endif
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/*
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* Allow clients with a virtual time of upto 5 minutes in the past to see
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* records that would have otherwise have expired.
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*/
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#define RBTDB_VIRTUAL 300
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struct noqname {
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dns_name_t name;
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void * nsec;
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void * nsecsig;
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};
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typedef struct acachectl acachectl_t;
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typedef struct rdatasetheader {
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/*%
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* Locked by the owning node's lock.
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*/
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rbtdb_serial_t serial;
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dns_ttl_t ttl;
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rbtdb_rdatatype_t type;
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isc_uint16_t attributes;
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dns_trust_t trust;
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struct noqname *noqname;
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/*%<
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* We don't use the LIST macros, because the LIST structure has
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* both head and tail pointers, and is doubly linked.
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*/
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struct rdatasetheader *next;
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/*%<
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* If this is the top header for an rdataset, 'next' points
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* to the top header for the next rdataset (i.e., the next type).
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* Otherwise, it points up to the header whose down pointer points
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* at this header.
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*/
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struct rdatasetheader *down;
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/*%<
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* Points to the header for the next older version of
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* this rdataset.
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*/
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isc_uint32_t count;
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/*%<
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* Monotonously increased every time this rdataset is bound so that
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* it is used as the base of the starting point in DNS responses
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* when the "cyclic" rrset-order is required. Since the ordering
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* should not be so crucial, no lock is set for the counter for
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* performance reasons.
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*/
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acachectl_t *additional_auth;
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acachectl_t *additional_glue;
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} rdatasetheader_t;
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#define RDATASET_ATTR_NONEXISTENT 0x0001
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#define RDATASET_ATTR_STALE 0x0002
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#define RDATASET_ATTR_IGNORE 0x0004
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#define RDATASET_ATTR_RETAIN 0x0008
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#define RDATASET_ATTR_NXDOMAIN 0x0010
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typedef struct acache_cbarg {
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dns_rdatasetadditional_t type;
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unsigned int count;
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dns_db_t *db;
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dns_dbnode_t *node;
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rdatasetheader_t *header;
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} acache_cbarg_t;
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struct acachectl {
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dns_acacheentry_t *entry;
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acache_cbarg_t *cbarg;
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};
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/*
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* XXX
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* When the cache will pre-expire data (due to memory low or other
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* situations) before the rdataset's TTL has expired, it MUST
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* respect the RETAIN bit and not expire the data until its TTL is
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* expired.
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*/
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#undef IGNORE /* WIN32 winbase.h defines this. */
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#define EXISTS(header) \
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(((header)->attributes & RDATASET_ATTR_NONEXISTENT) == 0)
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#define NONEXISTENT(header) \
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(((header)->attributes & RDATASET_ATTR_NONEXISTENT) != 0)
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#define IGNORE(header) \
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(((header)->attributes & RDATASET_ATTR_IGNORE) != 0)
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#define RETAIN(header) \
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(((header)->attributes & RDATASET_ATTR_RETAIN) != 0)
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#define NXDOMAIN(header) \
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(((header)->attributes & RDATASET_ATTR_NXDOMAIN) != 0)
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#define DEFAULT_NODE_LOCK_COUNT 7 /*%< Should be prime. */
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#define DEFAULT_CACHE_NODE_LOCK_COUNT 1009 /*%< Should be prime. */
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typedef struct {
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nodelock_t lock;
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/* Protected in the refcount routines. */
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isc_refcount_t references;
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/* Locked by lock. */
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isc_boolean_t exiting;
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} rbtdb_nodelock_t;
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typedef struct rbtdb_changed {
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dns_rbtnode_t * node;
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isc_boolean_t dirty;
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ISC_LINK(struct rbtdb_changed) link;
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} rbtdb_changed_t;
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typedef ISC_LIST(rbtdb_changed_t) rbtdb_changedlist_t;
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typedef struct rbtdb_version {
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/* Not locked */
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rbtdb_serial_t serial;
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/*
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* Protected in the refcount routines.
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* XXXJT: should we change the lock policy based on the refcount
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* performance?
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*/
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isc_refcount_t references;
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/* Locked by database lock. */
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isc_boolean_t writer;
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isc_boolean_t commit_ok;
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rbtdb_changedlist_t changed_list;
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ISC_LINK(struct rbtdb_version) link;
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} rbtdb_version_t;
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typedef ISC_LIST(rbtdb_version_t) rbtdb_versionlist_t;
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typedef struct {
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/* Unlocked. */
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dns_db_t common;
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#if DNS_RBTDB_USERWLOCK
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isc_rwlock_t lock;
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#else
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isc_mutex_t lock;
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#endif
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isc_rwlock_t tree_lock;
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unsigned int node_lock_count;
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rbtdb_nodelock_t * node_locks;
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dns_rbtnode_t * origin_node;
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/* Locked by lock. */
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unsigned int active;
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isc_refcount_t references;
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unsigned int attributes;
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rbtdb_serial_t current_serial;
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rbtdb_serial_t least_serial;
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rbtdb_serial_t next_serial;
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rbtdb_version_t * current_version;
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rbtdb_version_t * future_version;
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rbtdb_versionlist_t open_versions;
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isc_boolean_t overmem;
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isc_task_t * task;
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dns_dbnode_t *soanode;
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dns_dbnode_t *nsnode;
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/* Locked by tree_lock. */
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dns_rbt_t * tree;
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isc_boolean_t secure;
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/* Unlocked */
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unsigned int quantum;
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} dns_rbtdb_t;
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#define RBTDB_ATTR_LOADED 0x01
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#define RBTDB_ATTR_LOADING 0x02
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/*%
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* Search Context
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*/
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typedef struct {
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dns_rbtdb_t * rbtdb;
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rbtdb_version_t * rbtversion;
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rbtdb_serial_t serial;
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unsigned int options;
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dns_rbtnodechain_t chain;
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isc_boolean_t copy_name;
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isc_boolean_t need_cleanup;
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isc_boolean_t wild;
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dns_rbtnode_t * zonecut;
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rdatasetheader_t * zonecut_rdataset;
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rdatasetheader_t * zonecut_sigrdataset;
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dns_fixedname_t zonecut_name;
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isc_stdtime_t now;
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} rbtdb_search_t;
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/*%
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* Load Context
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*/
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typedef struct {
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dns_rbtdb_t * rbtdb;
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isc_stdtime_t now;
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} rbtdb_load_t;
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static void rdataset_disassociate(dns_rdataset_t *rdataset);
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static isc_result_t rdataset_first(dns_rdataset_t *rdataset);
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static isc_result_t rdataset_next(dns_rdataset_t *rdataset);
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static void rdataset_current(dns_rdataset_t *rdataset, dns_rdata_t *rdata);
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static void rdataset_clone(dns_rdataset_t *source, dns_rdataset_t *target);
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static unsigned int rdataset_count(dns_rdataset_t *rdataset);
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static isc_result_t rdataset_getnoqname(dns_rdataset_t *rdataset,
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dns_name_t *name,
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dns_rdataset_t *nsec,
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dns_rdataset_t *nsecsig);
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static isc_result_t rdataset_getadditional(dns_rdataset_t *rdataset,
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dns_rdatasetadditional_t type,
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dns_rdatatype_t qtype,
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dns_acache_t *acache,
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dns_zone_t **zonep,
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dns_db_t **dbp,
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dns_dbversion_t **versionp,
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dns_dbnode_t **nodep,
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dns_name_t *fname,
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dns_message_t *msg,
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isc_stdtime_t now);
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static isc_result_t rdataset_setadditional(dns_rdataset_t *rdataset,
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dns_rdatasetadditional_t type,
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dns_rdatatype_t qtype,
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dns_acache_t *acache,
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dns_zone_t *zone,
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dns_db_t *db,
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dns_dbversion_t *version,
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dns_dbnode_t *node,
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dns_name_t *fname);
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static isc_result_t rdataset_putadditional(dns_acache_t *acache,
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dns_rdataset_t *rdataset,
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dns_rdatasetadditional_t type,
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dns_rdatatype_t qtype);
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static dns_rdatasetmethods_t rdataset_methods = {
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rdataset_disassociate,
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rdataset_first,
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rdataset_next,
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rdataset_current,
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rdataset_clone,
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rdataset_count,
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NULL,
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rdataset_getnoqname,
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rdataset_getadditional,
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rdataset_setadditional,
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rdataset_putadditional
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};
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static void rdatasetiter_destroy(dns_rdatasetiter_t **iteratorp);
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static isc_result_t rdatasetiter_first(dns_rdatasetiter_t *iterator);
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static isc_result_t rdatasetiter_next(dns_rdatasetiter_t *iterator);
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static void rdatasetiter_current(dns_rdatasetiter_t *iterator,
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dns_rdataset_t *rdataset);
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static dns_rdatasetitermethods_t rdatasetiter_methods = {
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rdatasetiter_destroy,
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rdatasetiter_first,
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rdatasetiter_next,
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rdatasetiter_current
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};
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typedef struct rbtdb_rdatasetiter {
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dns_rdatasetiter_t common;
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rdatasetheader_t * current;
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} rbtdb_rdatasetiter_t;
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static void dbiterator_destroy(dns_dbiterator_t **iteratorp);
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static isc_result_t dbiterator_first(dns_dbiterator_t *iterator);
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static isc_result_t dbiterator_last(dns_dbiterator_t *iterator);
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static isc_result_t dbiterator_seek(dns_dbiterator_t *iterator,
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|
dns_name_t *name);
|
|
static isc_result_t dbiterator_prev(dns_dbiterator_t *iterator);
|
|
static isc_result_t dbiterator_next(dns_dbiterator_t *iterator);
|
|
static isc_result_t dbiterator_current(dns_dbiterator_t *iterator,
|
|
dns_dbnode_t **nodep,
|
|
dns_name_t *name);
|
|
static isc_result_t dbiterator_pause(dns_dbiterator_t *iterator);
|
|
static isc_result_t dbiterator_origin(dns_dbiterator_t *iterator,
|
|
dns_name_t *name);
|
|
|
|
static dns_dbiteratormethods_t dbiterator_methods = {
|
|
dbiterator_destroy,
|
|
dbiterator_first,
|
|
dbiterator_last,
|
|
dbiterator_seek,
|
|
dbiterator_prev,
|
|
dbiterator_next,
|
|
dbiterator_current,
|
|
dbiterator_pause,
|
|
dbiterator_origin
|
|
};
|
|
|
|
#define DELETION_BATCH_MAX 64
|
|
|
|
/*
|
|
* If 'paused' is ISC_TRUE, then the tree lock is not being held.
|
|
*/
|
|
typedef struct rbtdb_dbiterator {
|
|
dns_dbiterator_t common;
|
|
isc_boolean_t paused;
|
|
isc_boolean_t new_origin;
|
|
isc_rwlocktype_t tree_locked;
|
|
isc_result_t result;
|
|
dns_fixedname_t name;
|
|
dns_fixedname_t origin;
|
|
dns_rbtnodechain_t chain;
|
|
dns_rbtnode_t *node;
|
|
dns_rbtnode_t *deletions[DELETION_BATCH_MAX];
|
|
int delete;
|
|
} rbtdb_dbiterator_t;
|
|
|
|
|
|
#define IS_STUB(rbtdb) (((rbtdb)->common.attributes & DNS_DBATTR_STUB) != 0)
|
|
#define IS_CACHE(rbtdb) (((rbtdb)->common.attributes & DNS_DBATTR_CACHE) != 0)
|
|
|
|
static void free_rbtdb(dns_rbtdb_t *rbtdb, isc_boolean_t log,
|
|
isc_event_t *event);
|
|
|
|
/*%
|
|
* '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 simultanious updates.
|
|
*
|
|
* Note:
|
|
* Both init_count and header->count can be ISC_UINT32_MAX.
|
|
* The count on the returned rdataset however can't be as
|
|
* that indicates that the database does not implement cyclic
|
|
* processing.
|
|
*/
|
|
static unsigned int init_count;
|
|
|
|
/*
|
|
* Locking
|
|
*
|
|
* If a routine is going to lock more than one lock in this module, then
|
|
* the locking must be done in the following order:
|
|
*
|
|
* Tree Lock
|
|
*
|
|
* Node Lock (Only one from the set may be locked at one time by
|
|
* any caller)
|
|
*
|
|
* Database Lock
|
|
*
|
|
* Failure to follow this hierarchy can result in deadlock.
|
|
*/
|
|
|
|
/*
|
|
* Deleting Nodes
|
|
*
|
|
* Currently there is no deletion of nodes from the database, except when
|
|
* the database is being destroyed.
|
|
*
|
|
* If node deletion is added in the future, then for zone databases the node
|
|
* for the origin of the zone MUST NOT be deleted.
|
|
*/
|
|
|
|
|
|
/*
|
|
* DB Routines
|
|
*/
|
|
|
|
static void
|
|
attach(dns_db_t *source, dns_db_t **targetp) {
|
|
dns_rbtdb_t *rbtdb = (dns_rbtdb_t *)source;
|
|
|
|
REQUIRE(VALID_RBTDB(rbtdb));
|
|
|
|
isc_refcount_increment(&rbtdb->references, NULL);
|
|
|
|
*targetp = source;
|
|
}
|
|
|
|
static void
|
|
free_rbtdb_callback(isc_task_t *task, isc_event_t *event) {
|
|
dns_rbtdb_t *rbtdb = event->ev_arg;
|
|
|
|
UNUSED(task);
|
|
|
|
free_rbtdb(rbtdb, ISC_TRUE, event);
|
|
}
|
|
|
|
/*%
|
|
* 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;
|
|
isc_uint64_t usecs;
|
|
isc_time_t end;
|
|
unsigned int new;
|
|
|
|
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);
|
|
}
|
|
new = old * interval;
|
|
new /= (unsigned int)usecs;
|
|
if (new == 0)
|
|
new = 1;
|
|
else if (new > 1000)
|
|
new = 1000;
|
|
|
|
/* Smooth */
|
|
new = (new + old * 3) / 4;
|
|
|
|
isc_log_write(dns_lctx, DNS_LOGCATEGORY_DATABASE, DNS_LOGMODULE_CACHE,
|
|
ISC_LOG_DEBUG(1), "adjust_quantum -> %d", new);
|
|
|
|
return (new);
|
|
}
|
|
|
|
static void
|
|
free_rbtdb(dns_rbtdb_t *rbtdb, isc_boolean_t log, isc_event_t *event) {
|
|
unsigned int i;
|
|
isc_ondestroy_t ondest;
|
|
isc_result_t result;
|
|
char buf[DNS_NAME_FORMATSIZE];
|
|
isc_time_t start;
|
|
|
|
REQUIRE(rbtdb->current_version != NULL || EMPTY(rbtdb->open_versions));
|
|
REQUIRE(rbtdb->future_version == NULL);
|
|
|
|
if (rbtdb->current_version != NULL) {
|
|
unsigned int refs;
|
|
|
|
isc_refcount_decrement(&rbtdb->current_version->references,
|
|
&refs);
|
|
INSIST(refs == 0);
|
|
UNLINK(rbtdb->open_versions, rbtdb->current_version, link);
|
|
isc_refcount_destroy(&rbtdb->current_version->references);
|
|
isc_mem_put(rbtdb->common.mctx, rbtdb->current_version,
|
|
sizeof(rbtdb_version_t));
|
|
}
|
|
if (event == NULL)
|
|
rbtdb->quantum = (rbtdb->task != NULL) ? 100 : 0;
|
|
again:
|
|
if (rbtdb->tree != NULL) {
|
|
isc_time_now(&start);
|
|
result = dns_rbt_destroy2(&rbtdb->tree, 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));
|
|
if (event == NULL)
|
|
goto again;
|
|
isc_task_send(rbtdb->task, &event);
|
|
return;
|
|
}
|
|
INSIST(result == ISC_R_SUCCESS && rbtdb->tree == NULL);
|
|
}
|
|
if (event != NULL)
|
|
isc_event_free(&event);
|
|
if (log) {
|
|
if (dns_name_dynamic(&rbtdb->common.origin))
|
|
dns_name_format(&rbtdb->common.origin, buf,
|
|
sizeof(buf));
|
|
else
|
|
strcpy(buf, "<UNKNOWN>");
|
|
isc_log_write(dns_lctx, DNS_LOGCATEGORY_DATABASE,
|
|
DNS_LOGMODULE_CACHE, ISC_LOG_DEBUG(1),
|
|
"done free_rbtdb(%s)", buf);
|
|
}
|
|
if (dns_name_dynamic(&rbtdb->common.origin))
|
|
dns_name_free(&rbtdb->common.origin, rbtdb->common.mctx);
|
|
for (i = 0; i < rbtdb->node_lock_count; i++) {
|
|
isc_refcount_destroy(&rbtdb->node_locks[i].references);
|
|
NODE_DESTROYLOCK(&rbtdb->node_locks[i].lock);
|
|
}
|
|
isc_mem_put(rbtdb->common.mctx, rbtdb->node_locks,
|
|
rbtdb->node_lock_count * sizeof(rbtdb_nodelock_t));
|
|
isc_rwlock_destroy(&rbtdb->tree_lock);
|
|
isc_refcount_destroy(&rbtdb->references);
|
|
if (rbtdb->task != NULL)
|
|
isc_task_detach(&rbtdb->task);
|
|
RBTDB_DESTROYLOCK(&rbtdb->lock);
|
|
rbtdb->common.magic = 0;
|
|
rbtdb->common.impmagic = 0;
|
|
ondest = rbtdb->common.ondest;
|
|
isc_mem_putanddetach(&rbtdb->common.mctx, rbtdb, sizeof(*rbtdb));
|
|
isc_ondestroy_notify(&ondest, rbtdb);
|
|
}
|
|
|
|
static inline void
|
|
maybe_free_rbtdb(dns_rbtdb_t *rbtdb) {
|
|
isc_boolean_t want_free = ISC_FALSE;
|
|
unsigned int i;
|
|
unsigned int inactive = 0;
|
|
|
|
/* XXX check for open versions here */
|
|
|
|
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);
|
|
|
|
/*
|
|
* 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 = ISC_TRUE;
|
|
NODE_UNLOCK(&rbtdb->node_locks[i].lock, isc_rwlocktype_write);
|
|
if (isc_refcount_current(&rbtdb->node_locks[i].references)
|
|
== 0) {
|
|
inactive++;
|
|
}
|
|
}
|
|
|
|
if (inactive != 0) {
|
|
RBTDB_LOCK(&rbtdb->lock, isc_rwlocktype_write);
|
|
rbtdb->active -= inactive;
|
|
if (rbtdb->active == 0)
|
|
want_free = ISC_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
|
|
strcpy(buf, "<UNKNOWN>");
|
|
isc_log_write(dns_lctx, DNS_LOGCATEGORY_DATABASE,
|
|
DNS_LOGMODULE_CACHE, ISC_LOG_DEBUG(1),
|
|
"calling free_rbtdb(%s)", buf);
|
|
free_rbtdb(rbtdb, ISC_TRUE, NULL);
|
|
}
|
|
}
|
|
}
|
|
|
|
static void
|
|
detach(dns_db_t **dbp) {
|
|
dns_rbtdb_t *rbtdb = (dns_rbtdb_t *)(*dbp);
|
|
unsigned int refs;
|
|
|
|
REQUIRE(VALID_RBTDB(rbtdb));
|
|
|
|
isc_refcount_decrement(&rbtdb->references, &refs);
|
|
|
|
if (refs == 0)
|
|
maybe_free_rbtdb(rbtdb);
|
|
|
|
*dbp = NULL;
|
|
}
|
|
|
|
static void
|
|
currentversion(dns_db_t *db, dns_dbversion_t **versionp) {
|
|
dns_rbtdb_t *rbtdb = (dns_rbtdb_t *)db;
|
|
rbtdb_version_t *version;
|
|
unsigned int refs;
|
|
|
|
REQUIRE(VALID_RBTDB(rbtdb));
|
|
|
|
RBTDB_LOCK(&rbtdb->lock, isc_rwlocktype_read);
|
|
version = rbtdb->current_version;
|
|
isc_refcount_increment(&version->references, &refs);
|
|
RBTDB_UNLOCK(&rbtdb->lock, isc_rwlocktype_read);
|
|
|
|
*versionp = (dns_dbversion_t *)version;
|
|
}
|
|
|
|
static inline rbtdb_version_t *
|
|
allocate_version(isc_mem_t *mctx, rbtdb_serial_t serial,
|
|
unsigned int references, isc_boolean_t writer)
|
|
{
|
|
isc_result_t result;
|
|
rbtdb_version_t *version;
|
|
|
|
version = isc_mem_get(mctx, sizeof(*version));
|
|
if (version == NULL)
|
|
return (NULL);
|
|
version->serial = serial;
|
|
result = isc_refcount_init(&version->references, references);
|
|
if (result != ISC_R_SUCCESS) {
|
|
isc_mem_put(mctx, version, sizeof(*version));
|
|
return (NULL);
|
|
}
|
|
version->writer = writer;
|
|
version->commit_ok = ISC_FALSE;
|
|
ISC_LIST_INIT(version->changed_list);
|
|
ISC_LINK_INIT(version, link);
|
|
|
|
return (version);
|
|
}
|
|
|
|
static isc_result_t
|
|
newversion(dns_db_t *db, dns_dbversion_t **versionp) {
|
|
dns_rbtdb_t *rbtdb = (dns_rbtdb_t *)db;
|
|
rbtdb_version_t *version;
|
|
|
|
REQUIRE(VALID_RBTDB(rbtdb));
|
|
REQUIRE(versionp != NULL && *versionp == NULL);
|
|
REQUIRE(rbtdb->future_version == NULL);
|
|
|
|
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,
|
|
ISC_TRUE);
|
|
if (version != NULL) {
|
|
version->commit_ok = ISC_TRUE;
|
|
rbtdb->next_serial++;
|
|
rbtdb->future_version = version;
|
|
}
|
|
RBTDB_UNLOCK(&rbtdb->lock, isc_rwlocktype_write);
|
|
|
|
if (version == NULL)
|
|
return (ISC_R_NOMEMORY);
|
|
|
|
*versionp = version;
|
|
|
|
return (ISC_R_SUCCESS);
|
|
}
|
|
|
|
static void
|
|
attachversion(dns_db_t *db, dns_dbversion_t *source,
|
|
dns_dbversion_t **targetp)
|
|
{
|
|
dns_rbtdb_t *rbtdb = (dns_rbtdb_t *)db;
|
|
rbtdb_version_t *rbtversion = source;
|
|
unsigned int refs;
|
|
|
|
REQUIRE(VALID_RBTDB(rbtdb));
|
|
|
|
isc_refcount_increment(&rbtversion->references, &refs);
|
|
INSIST(refs > 1);
|
|
|
|
*targetp = rbtversion;
|
|
}
|
|
|
|
static rbtdb_changed_t *
|
|
add_changed(dns_rbtdb_t *rbtdb, rbtdb_version_t *version,
|
|
dns_rbtnode_t *node)
|
|
{
|
|
rbtdb_changed_t *changed;
|
|
unsigned int refs;
|
|
|
|
/*
|
|
* 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) {
|
|
dns_rbtnode_refincrement(node, &refs);
|
|
INSIST(refs != 0);
|
|
changed->node = node;
|
|
changed->dirty = ISC_FALSE;
|
|
ISC_LIST_INITANDAPPEND(version->changed_list, changed, link);
|
|
} else
|
|
version->commit_ok = ISC_FALSE;
|
|
|
|
RBTDB_UNLOCK(&rbtdb->lock, isc_rwlocktype_write);
|
|
|
|
return (changed);
|
|
}
|
|
|
|
static void
|
|
free_acachearray(isc_mem_t *mctx, rdatasetheader_t *header,
|
|
acachectl_t *array)
|
|
{
|
|
unsigned int count;
|
|
unsigned int i;
|
|
unsigned char *raw; /* RDATASLAB */
|
|
|
|
/*
|
|
* The caller must be holding the corresponding node lock.
|
|
*/
|
|
|
|
if (array == NULL)
|
|
return;
|
|
|
|
raw = (unsigned char *)header + sizeof(*header);
|
|
count = raw[0] * 256 + raw[1];
|
|
|
|
/*
|
|
* Sanity check: since an additional cache entry has a reference to
|
|
* the original DB node (in the callback arg), there should be no
|
|
* acache entries when the node can be freed.
|
|
*/
|
|
for (i = 0; i < count; i++)
|
|
INSIST(array[i].entry == NULL && array[i].cbarg == NULL);
|
|
|
|
isc_mem_put(mctx, array, count * sizeof(acachectl_t));
|
|
}
|
|
|
|
static inline void
|
|
free_noqname(isc_mem_t *mctx, struct noqname **noqname) {
|
|
|
|
if (dns_name_dynamic(&(*noqname)->name))
|
|
dns_name_free(&(*noqname)->name, mctx);
|
|
if ((*noqname)->nsec != NULL)
|
|
isc_mem_put(mctx, (*noqname)->nsec,
|
|
dns_rdataslab_size((*noqname)->nsec, 0));
|
|
if ((*noqname)->nsecsig != NULL)
|
|
isc_mem_put(mctx, (*noqname)->nsecsig,
|
|
dns_rdataslab_size((*noqname)->nsecsig, 0));
|
|
isc_mem_put(mctx, *noqname, sizeof(**noqname));
|
|
*noqname = NULL;
|
|
}
|
|
|
|
static inline void
|
|
free_rdataset(isc_mem_t *mctx, rdatasetheader_t *rdataset) {
|
|
unsigned int size;
|
|
|
|
if (rdataset->noqname != NULL)
|
|
free_noqname(mctx, &rdataset->noqname);
|
|
|
|
free_acachearray(mctx, rdataset, rdataset->additional_auth);
|
|
free_acachearray(mctx, rdataset, rdataset->additional_glue);
|
|
|
|
if ((rdataset->attributes & RDATASET_ATTR_NONEXISTENT) != 0)
|
|
size = sizeof(*rdataset);
|
|
else
|
|
size = dns_rdataslab_size((unsigned char *)rdataset,
|
|
sizeof(*rdataset));
|
|
isc_mem_put(mctx, rdataset, size);
|
|
}
|
|
|
|
static inline void
|
|
rollback_node(dns_rbtnode_t *node, rbtdb_serial_t serial) {
|
|
rdatasetheader_t *header, *dcurrent;
|
|
isc_boolean_t make_dirty = ISC_FALSE;
|
|
|
|
/*
|
|
* Caller must hold the node lock.
|
|
*/
|
|
|
|
/*
|
|
* We set the IGNORE attribute on rdatasets with serial number
|
|
* 'serial'. When the reference count goes to zero, these rdatasets
|
|
* will be cleaned up; until that time, they will be ignored.
|
|
*/
|
|
for (header = node->data; header != NULL; header = header->next) {
|
|
if (header->serial == serial) {
|
|
header->attributes |= RDATASET_ATTR_IGNORE;
|
|
make_dirty = ISC_TRUE;
|
|
}
|
|
for (dcurrent = header->down;
|
|
dcurrent != NULL;
|
|
dcurrent = dcurrent->down) {
|
|
if (dcurrent->serial == serial) {
|
|
dcurrent->attributes |= RDATASET_ATTR_IGNORE;
|
|
make_dirty = ISC_TRUE;
|
|
}
|
|
}
|
|
}
|
|
if (make_dirty)
|
|
node->dirty = 1;
|
|
}
|
|
|
|
static inline void
|
|
clean_stale_headers(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(mctx, d);
|
|
}
|
|
top->down = NULL;
|
|
}
|
|
|
|
static inline 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(mctx, current);
|
|
/*
|
|
* If current is nonexistent or stale, we can clean it up.
|
|
*/
|
|
if ((current->attributes &
|
|
(RDATASET_ATTR_NONEXISTENT|RDATASET_ATTR_STALE)) != 0) {
|
|
if (top_prev != NULL)
|
|
top_prev->next = current->next;
|
|
else
|
|
node->data = current->next;
|
|
free_rdataset(mctx, current);
|
|
} else
|
|
top_prev = current;
|
|
}
|
|
node->dirty = 0;
|
|
}
|
|
|
|
static inline void
|
|
clean_zone_node(dns_rbtdb_t *rbtdb, dns_rbtnode_t *node,
|
|
rbtdb_serial_t least_serial)
|
|
{
|
|
rdatasetheader_t *current, *dcurrent, *down_next, *dparent;
|
|
rdatasetheader_t *top_prev, *top_next;
|
|
isc_mem_t *mctx = rbtdb->common.mctx;
|
|
isc_boolean_t still_dirty = ISC_FALSE;
|
|
|
|
/*
|
|
* Caller must be holding the node lock.
|
|
*/
|
|
REQUIRE(least_serial != 0);
|
|
|
|
top_prev = NULL;
|
|
for (current = node->data; current != NULL; current = top_next) {
|
|
top_next = current->next;
|
|
|
|
/*
|
|
* First, we clean up any instances of multiple rdatasets
|
|
* with the same serial number, or that have the IGNORE
|
|
* attribute.
|
|
*/
|
|
dparent = current;
|
|
for (dcurrent = current->down;
|
|
dcurrent != NULL;
|
|
dcurrent = down_next) {
|
|
down_next = dcurrent->down;
|
|
INSIST(dcurrent->serial <= dparent->serial);
|
|
if (dcurrent->serial == dparent->serial ||
|
|
IGNORE(dcurrent)) {
|
|
if (down_next != NULL)
|
|
down_next->next = dparent;
|
|
dparent->down = down_next;
|
|
free_rdataset(mctx, dcurrent);
|
|
} else
|
|
dparent = dcurrent;
|
|
}
|
|
|
|
/*
|
|
* We've now eliminated all IGNORE datasets with the possible
|
|
* exception of current, which we now check.
|
|
*/
|
|
if (IGNORE(current)) {
|
|
down_next = current->down;
|
|
if (down_next == NULL) {
|
|
if (top_prev != NULL)
|
|
top_prev->next = current->next;
|
|
else
|
|
node->data = current->next;
|
|
free_rdataset(mctx, current);
|
|
/*
|
|
* current no longer exists, so we can
|
|
* just continue with the loop.
|
|
*/
|
|
continue;
|
|
} else {
|
|
/*
|
|
* Pull up current->down, making it the new
|
|
* current.
|
|
*/
|
|
if (top_prev != NULL)
|
|
top_prev->next = down_next;
|
|
else
|
|
node->data = down_next;
|
|
down_next->next = top_next;
|
|
free_rdataset(mctx, current);
|
|
current = down_next;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* We now try to find the first down node less than the
|
|
* least serial.
|
|
*/
|
|
dparent = current;
|
|
for (dcurrent = current->down;
|
|
dcurrent != NULL;
|
|
dcurrent = down_next) {
|
|
down_next = dcurrent->down;
|
|
if (dcurrent->serial < least_serial)
|
|
break;
|
|
dparent = dcurrent;
|
|
}
|
|
|
|
/*
|
|
* If there is a such an rdataset, delete it and any older
|
|
* versions.
|
|
*/
|
|
if (dcurrent != NULL) {
|
|
do {
|
|
down_next = dcurrent->down;
|
|
INSIST(dcurrent->serial <= least_serial);
|
|
free_rdataset(mctx, dcurrent);
|
|
dcurrent = down_next;
|
|
} while (dcurrent != NULL);
|
|
dparent->down = NULL;
|
|
}
|
|
|
|
/*
|
|
* Note. The serial number of 'current' might be less than
|
|
* least_serial too, but we cannot delete it because it is
|
|
* the most recent version, unless it is a NONEXISTENT
|
|
* rdataset.
|
|
*/
|
|
if (current->down != NULL) {
|
|
still_dirty = ISC_TRUE;
|
|
top_prev = current;
|
|
} else {
|
|
/*
|
|
* If this is a NONEXISTENT rdataset, we can delete it.
|
|
*/
|
|
if (NONEXISTENT(current)) {
|
|
if (top_prev != NULL)
|
|
top_prev->next = current->next;
|
|
else
|
|
node->data = current->next;
|
|
free_rdataset(mctx, current);
|
|
} else
|
|
top_prev = current;
|
|
}
|
|
}
|
|
if (!still_dirty)
|
|
node->dirty = 0;
|
|
}
|
|
|
|
/*
|
|
* Caller must be holding the node lock if its reference must be protected
|
|
* by the lock.
|
|
*/
|
|
static inline void
|
|
new_reference(dns_rbtdb_t *rbtdb, dns_rbtnode_t *node) {
|
|
unsigned int lockrefs, noderefs;
|
|
isc_refcount_t *lockref;
|
|
|
|
dns_rbtnode_refincrement0(node, &noderefs);
|
|
if (noderefs == 1) { /* this is the first reference to the node */
|
|
lockref = &rbtdb->node_locks[node->locknum].references;
|
|
isc_refcount_increment0(lockref, &lockrefs);
|
|
INSIST(lockrefs != 0);
|
|
}
|
|
INSIST(noderefs != 0);
|
|
}
|
|
|
|
/*
|
|
* 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 ISC_TRUE if and only if the node reference decreases
|
|
* to zero.
|
|
*/
|
|
static isc_boolean_t
|
|
decrement_reference(dns_rbtdb_t *rbtdb, dns_rbtnode_t *node,
|
|
rbtdb_serial_t least_serial,
|
|
isc_rwlocktype_t nlock, isc_rwlocktype_t tlock)
|
|
{
|
|
isc_result_t result;
|
|
isc_boolean_t write_locked;
|
|
rbtdb_nodelock_t *nodelock;
|
|
unsigned int refs, nrefs;
|
|
|
|
nodelock = &rbtdb->node_locks[node->locknum];
|
|
|
|
/* Handle easy and typical case first. */
|
|
if (!node->dirty && (node->data != NULL || node->down != NULL)) {
|
|
dns_rbtnode_refdecrement(node, &nrefs);
|
|
INSIST((int)nrefs >= 0);
|
|
if (nrefs == 0) {
|
|
isc_refcount_decrement(&nodelock->references, &refs);
|
|
INSIST((int)refs >= 0);
|
|
}
|
|
return ((nrefs == 0) ? ISC_TRUE : ISC_FALSE);
|
|
}
|
|
|
|
/* Upgrade the lock? */
|
|
if (nlock == isc_rwlocktype_read) {
|
|
NODE_WEAKUNLOCK(&nodelock->lock, isc_rwlocktype_read);
|
|
NODE_WEAKLOCK(&nodelock->lock, isc_rwlocktype_write);
|
|
}
|
|
dns_rbtnode_refdecrement(node, &nrefs);
|
|
INSIST((int)nrefs >= 0);
|
|
if (nrefs > 0) {
|
|
/* Restore the lock? */
|
|
if (nlock == isc_rwlocktype_read)
|
|
NODE_WEAKDOWNGRADE(&nodelock->lock);
|
|
return (ISC_FALSE);
|
|
}
|
|
|
|
if (node->dirty && dns_rbtnode_refcurrent(node) == 0) {
|
|
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);
|
|
}
|
|
}
|
|
|
|
isc_refcount_decrement(&nodelock->references, &refs);
|
|
INSIST((int)refs >= 0);
|
|
|
|
/*
|
|
* XXXDCL should this only be done for cache zones?
|
|
*/
|
|
if (node->data != NULL || node->down != NULL) {
|
|
/* Restore the lock? */
|
|
if (nlock == isc_rwlocktype_read)
|
|
NODE_WEAKDOWNGRADE(&nodelock->lock);
|
|
return (ISC_TRUE);
|
|
}
|
|
|
|
/*
|
|
* XXXDCL need to add a deferred delete method for ISC_R_LOCKBUSY.
|
|
*/
|
|
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 = ISC_TF(result == ISC_R_SUCCESS);
|
|
} else
|
|
write_locked = ISC_TRUE;
|
|
|
|
if (write_locked && dns_rbtnode_refcurrent(node) == 0) {
|
|
/*
|
|
* We can now delete the node if the reference counter is
|
|
* zero. This should be typically the case, but a different
|
|
* thread may still gain a (new) reference just before the
|
|
* current thread locks the tree (e.g., in findnode()).
|
|
*/
|
|
|
|
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),
|
|
"decrement_reference: "
|
|
"delete from rbt: %p %s",
|
|
node,
|
|
dns_rbt_formatnodename(node, printname,
|
|
sizeof(printname)));
|
|
}
|
|
|
|
result = dns_rbt_deletenode(rbtdb->tree, node, ISC_FALSE);
|
|
if (result != ISC_R_SUCCESS)
|
|
isc_log_write(dns_lctx, DNS_LOGCATEGORY_DATABASE,
|
|
DNS_LOGMODULE_CACHE, ISC_LOG_WARNING,
|
|
"decrement_reference: "
|
|
"dns_rbt_deletenode: %s",
|
|
isc_result_totext(result));
|
|
}
|
|
|
|
/* Restore the lock? */
|
|
if (nlock == isc_rwlocktype_read)
|
|
NODE_WEAKDOWNGRADE(&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 (ISC_TRUE);
|
|
}
|
|
|
|
static inline void
|
|
make_least_version(dns_rbtdb_t *rbtdb, rbtdb_version_t *version,
|
|
rbtdb_changedlist_t *cleanup_list)
|
|
{
|
|
/*
|
|
* Caller must be holding the database lock.
|
|
*/
|
|
|
|
rbtdb->least_serial = version->serial;
|
|
*cleanup_list = version->changed_list;
|
|
ISC_LIST_INIT(version->changed_list);
|
|
}
|
|
|
|
static inline void
|
|
cleanup_nondirty(rbtdb_version_t *version, rbtdb_changedlist_t *cleanup_list) {
|
|
rbtdb_changed_t *changed, *next_changed;
|
|
|
|
/*
|
|
* If the changed record is dirty, then
|
|
* an update created multiple versions of
|
|
* a given rdataset. We keep this list
|
|
* until we're the least open version, at
|
|
* which point it's safe to get rid of any
|
|
* older versions.
|
|
*
|
|
* If the changed record isn't dirty, then
|
|
* we don't need it anymore since we're
|
|
* committing and not rolling back.
|
|
*
|
|
* The caller must be holding the database lock.
|
|
*/
|
|
for (changed = HEAD(version->changed_list);
|
|
changed != NULL;
|
|
changed = next_changed) {
|
|
next_changed = NEXT(changed, link);
|
|
if (!changed->dirty) {
|
|
UNLINK(version->changed_list,
|
|
changed, link);
|
|
APPEND(*cleanup_list,
|
|
changed, link);
|
|
}
|
|
}
|
|
}
|
|
|
|
static isc_boolean_t
|
|
iszonesecure(dns_db_t *db, dns_dbnode_t *origin) {
|
|
dns_rdataset_t keyset;
|
|
dns_rdataset_t nsecset, signsecset;
|
|
isc_boolean_t haszonekey = ISC_FALSE;
|
|
isc_boolean_t hasnsec = ISC_FALSE;
|
|
isc_result_t result;
|
|
|
|
dns_rdataset_init(&keyset);
|
|
result = dns_db_findrdataset(db, origin, NULL, dns_rdatatype_dnskey, 0,
|
|
0, &keyset, NULL);
|
|
if (result == ISC_R_SUCCESS) {
|
|
dns_rdata_t keyrdata = DNS_RDATA_INIT;
|
|
result = dns_rdataset_first(&keyset);
|
|
while (result == ISC_R_SUCCESS) {
|
|
dns_rdataset_current(&keyset, &keyrdata);
|
|
if (dns_zonekey_iszonekey(&keyrdata)) {
|
|
haszonekey = ISC_TRUE;
|
|
break;
|
|
}
|
|
result = dns_rdataset_next(&keyset);
|
|
}
|
|
dns_rdataset_disassociate(&keyset);
|
|
}
|
|
if (!haszonekey)
|
|
return (ISC_FALSE);
|
|
|
|
dns_rdataset_init(&nsecset);
|
|
dns_rdataset_init(&signsecset);
|
|
result = dns_db_findrdataset(db, origin, NULL, dns_rdatatype_nsec, 0,
|
|
0, &nsecset, &signsecset);
|
|
if (result == ISC_R_SUCCESS) {
|
|
if (dns_rdataset_isassociated(&signsecset)) {
|
|
hasnsec = ISC_TRUE;
|
|
dns_rdataset_disassociate(&signsecset);
|
|
}
|
|
dns_rdataset_disassociate(&nsecset);
|
|
}
|
|
return (hasnsec);
|
|
}
|
|
|
|
static void
|
|
closeversion(dns_db_t *db, dns_dbversion_t **versionp, isc_boolean_t commit) {
|
|
dns_rbtdb_t *rbtdb = (dns_rbtdb_t *)db;
|
|
rbtdb_version_t *version, *cleanup_version, *least_greater;
|
|
isc_boolean_t rollback = ISC_FALSE;
|
|
rbtdb_changedlist_t cleanup_list;
|
|
rbtdb_changed_t *changed, *next_changed;
|
|
rbtdb_serial_t serial, least_serial;
|
|
dns_rbtnode_t *rbtnode;
|
|
unsigned int refs;
|
|
isc_boolean_t writer;
|
|
|
|
REQUIRE(VALID_RBTDB(rbtdb));
|
|
version = (rbtdb_version_t *)*versionp;
|
|
|
|
cleanup_version = NULL;
|
|
ISC_LIST_INIT(cleanup_list);
|
|
|
|
isc_refcount_decrement(&version->references, &refs);
|
|
if (refs > 0) { /* 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;
|
|
}
|
|
|
|
RBTDB_LOCK(&rbtdb->lock, isc_rwlocktype_write);
|
|
serial = version->serial;
|
|
writer = version->writer;
|
|
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;
|
|
isc_refcount_decrement(&cur_version->references,
|
|
&cur_ref);
|
|
if (cur_ref == 0) {
|
|
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 == 0) {
|
|
cleanup_version = cur_version;
|
|
APPENDLIST(version->changed_list,
|
|
cleanup_version->changed_list,
|
|
link);
|
|
}
|
|
/*
|
|
* Become the current version.
|
|
*/
|
|
version->writer = ISC_FALSE;
|
|
rbtdb->current_version = version;
|
|
rbtdb->current_serial = version->serial;
|
|
rbtdb->future_version = NULL;
|
|
|
|
/*
|
|
* 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().
|
|
*/
|
|
isc_refcount_increment0(&version->references,
|
|
&cur_ref);
|
|
INSIST(cur_ref == 1);
|
|
PREPEND(rbtdb->open_versions,
|
|
rbtdb->current_version, link);
|
|
} else {
|
|
/*
|
|
* We're rolling back this transaction.
|
|
*/
|
|
cleanup_list = version->changed_list;
|
|
ISC_LIST_INIT(version->changed_list);
|
|
rollback = ISC_TRUE;
|
|
cleanup_version = version;
|
|
rbtdb->future_version = NULL;
|
|
}
|
|
} else {
|
|
if (version != rbtdb->current_version) {
|
|
/*
|
|
* There are no external or internal references
|
|
* to this version and it can be cleaned up.
|
|
*/
|
|
cleanup_version = version;
|
|
|
|
/*
|
|
* Find the version with the least serial
|
|
* number greater than ours.
|
|
*/
|
|
least_greater = PREV(version, link);
|
|
if (least_greater == NULL)
|
|
least_greater = rbtdb->current_version;
|
|
|
|
INSIST(version->serial < least_greater->serial);
|
|
/*
|
|
* Is this the least open version?
|
|
*/
|
|
if (version->serial == rbtdb->least_serial) {
|
|
/*
|
|
* Yes. Install the new least open
|
|
* version.
|
|
*/
|
|
make_least_version(rbtdb,
|
|
least_greater,
|
|
&cleanup_list);
|
|
} else {
|
|
/*
|
|
* Add any unexecuted cleanups to
|
|
* those of the least greater version.
|
|
*/
|
|
APPENDLIST(least_greater->changed_list,
|
|
version->changed_list,
|
|
link);
|
|
}
|
|
} else if (version->serial == rbtdb->least_serial)
|
|
INSIST(EMPTY(version->changed_list));
|
|
UNLINK(rbtdb->open_versions, version, link);
|
|
}
|
|
least_serial = rbtdb->least_serial;
|
|
RBTDB_UNLOCK(&rbtdb->lock, isc_rwlocktype_write);
|
|
|
|
/*
|
|
* Update the zone's secure status.
|
|
*/
|
|
if (writer && commit && !IS_CACHE(rbtdb))
|
|
rbtdb->secure = iszonesecure(db, rbtdb->origin_node);
|
|
|
|
if (cleanup_version != NULL) {
|
|
INSIST(EMPTY(cleanup_version->changed_list));
|
|
isc_mem_put(rbtdb->common.mctx, cleanup_version,
|
|
sizeof(*cleanup_version));
|
|
}
|
|
|
|
if (!EMPTY(cleanup_list)) {
|
|
for (changed = HEAD(cleanup_list);
|
|
changed != NULL;
|
|
changed = next_changed) {
|
|
nodelock_t *lock;
|
|
|
|
next_changed = NEXT(changed, link);
|
|
rbtnode = changed->node;
|
|
lock = &rbtdb->node_locks[rbtnode->locknum].lock;
|
|
|
|
NODE_LOCK(lock, isc_rwlocktype_write);
|
|
if (rollback)
|
|
rollback_node(rbtnode, serial);
|
|
decrement_reference(rbtdb, rbtnode, least_serial,
|
|
isc_rwlocktype_write,
|
|
isc_rwlocktype_none);
|
|
NODE_UNLOCK(lock, isc_rwlocktype_write);
|
|
|
|
isc_mem_put(rbtdb->common.mctx, changed,
|
|
sizeof(*changed));
|
|
}
|
|
}
|
|
|
|
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.
|
|
*/
|
|
static isc_result_t
|
|
add_wildcard_magic(dns_rbtdb_t *rbtdb, dns_name_t *name) {
|
|
isc_result_t result;
|
|
dns_name_t foundname;
|
|
dns_offsets_t offsets;
|
|
unsigned int n;
|
|
dns_rbtnode_t *node = NULL;
|
|
|
|
dns_name_init(&foundname, offsets);
|
|
n = dns_name_countlabels(name);
|
|
INSIST(n >= 2);
|
|
n--;
|
|
dns_name_getlabelsequence(name, 1, n, &foundname);
|
|
result = dns_rbt_addnode(rbtdb->tree, &foundname, &node);
|
|
if (result != ISC_R_SUCCESS && result != ISC_R_EXISTS)
|
|
return (result);
|
|
node->find_callback = 1;
|
|
node->wild = 1;
|
|
return (ISC_R_SUCCESS);
|
|
}
|
|
|
|
static isc_result_t
|
|
add_empty_wildcards(dns_rbtdb_t *rbtdb, dns_name_t *name) {
|
|
isc_result_t result;
|
|
dns_name_t foundname;
|
|
dns_offsets_t offsets;
|
|
unsigned int n, l, i;
|
|
|
|
dns_name_init(&foundname, offsets);
|
|
n = dns_name_countlabels(name);
|
|
l = dns_name_countlabels(&rbtdb->common.origin);
|
|
i = l + 1;
|
|
while (i < n) {
|
|
dns_rbtnode_t *node = NULL; /* dummy */
|
|
dns_name_getlabelsequence(name, n - i, i, &foundname);
|
|
if (dns_name_iswildcard(&foundname)) {
|
|
result = add_wildcard_magic(rbtdb, &foundname);
|
|
if (result != ISC_R_SUCCESS)
|
|
return (result);
|
|
result = dns_rbt_addnode(rbtdb->tree, &foundname,
|
|
&node);
|
|
if (result != ISC_R_SUCCESS && result != ISC_R_EXISTS)
|
|
return (result);
|
|
}
|
|
i++;
|
|
}
|
|
return (ISC_R_SUCCESS);
|
|
}
|
|
|
|
static isc_result_t
|
|
findnode(dns_db_t *db, dns_name_t *name, isc_boolean_t create,
|
|
dns_dbnode_t **nodep)
|
|
{
|
|
dns_rbtdb_t *rbtdb = (dns_rbtdb_t *)db;
|
|
dns_rbtnode_t *node = NULL;
|
|
dns_name_t nodename;
|
|
isc_result_t result;
|
|
isc_rwlocktype_t locktype = isc_rwlocktype_read;
|
|
|
|
REQUIRE(VALID_RBTDB(rbtdb));
|
|
|
|
dns_name_init(&nodename, NULL);
|
|
RWLOCK(&rbtdb->tree_lock, locktype);
|
|
result = dns_rbt_findnode(rbtdb->tree, name, NULL, &node, NULL,
|
|
DNS_RBTFIND_EMPTYDATA, NULL, NULL);
|
|
if (result != ISC_R_SUCCESS) {
|
|
RWUNLOCK(&rbtdb->tree_lock, locktype);
|
|
if (!create) {
|
|
if (result == DNS_R_PARTIALMATCH)
|
|
result = ISC_R_NOTFOUND;
|
|
return (result);
|
|
}
|
|
/*
|
|
* It would be nice to try to upgrade the lock instead of
|
|
* unlocking then relocking.
|
|
*/
|
|
locktype = isc_rwlocktype_write;
|
|
RWLOCK(&rbtdb->tree_lock, locktype);
|
|
node = NULL;
|
|
result = dns_rbt_addnode(rbtdb->tree, name, &node);
|
|
if (result == ISC_R_SUCCESS) {
|
|
dns_rbt_namefromnode(node, &nodename);
|
|
#ifdef DNS_RBT_USEHASH
|
|
node->locknum = node->hashval % rbtdb->node_lock_count;
|
|
#else
|
|
node->locknum = dns_name_hash(&nodename, ISC_TRUE) %
|
|
rbtdb->node_lock_count;
|
|
#endif
|
|
add_empty_wildcards(rbtdb, name);
|
|
|
|
if (dns_name_iswildcard(name)) {
|
|
result = add_wildcard_magic(rbtdb, name);
|
|
if (result != ISC_R_SUCCESS) {
|
|
RWUNLOCK(&rbtdb->tree_lock, locktype);
|
|
return (result);
|
|
}
|
|
}
|
|
} else if (result != ISC_R_EXISTS) {
|
|
RWUNLOCK(&rbtdb->tree_lock, locktype);
|
|
return (result);
|
|
}
|
|
}
|
|
NODE_STRONGLOCK(&rbtdb->node_locks[node->locknum].lock);
|
|
new_reference(rbtdb, node);
|
|
NODE_STRONGUNLOCK(&rbtdb->node_locks[node->locknum].lock);
|
|
RWUNLOCK(&rbtdb->tree_lock, locktype);
|
|
|
|
*nodep = (dns_dbnode_t *)node;
|
|
|
|
return (ISC_R_SUCCESS);
|
|
}
|
|
|
|
static isc_result_t
|
|
zone_zonecut_callback(dns_rbtnode_t *node, dns_name_t *name, void *arg) {
|
|
rbtdb_search_t *search = arg;
|
|
rdatasetheader_t *header, *header_next;
|
|
rdatasetheader_t *dname_header, *sigdname_header, *ns_header;
|
|
rdatasetheader_t *found;
|
|
isc_result_t result;
|
|
dns_rbtnode_t *onode;
|
|
|
|
/*
|
|
* We only want to remember the topmost zone cut, since it's the one
|
|
* that counts, so we'll just continue if we've already found a
|
|
* zonecut.
|
|
*/
|
|
if (search->zonecut != NULL)
|
|
return (DNS_R_CONTINUE);
|
|
|
|
found = NULL;
|
|
result = DNS_R_CONTINUE;
|
|
onode = search->rbtdb->origin_node;
|
|
|
|
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 (dname_header != NULL) {
|
|
/*
|
|
* Note that DNAME has precedence over NS if both exist.
|
|
*/
|
|
found = dname_header;
|
|
search->zonecut_sigrdataset = sigdname_header;
|
|
} else if (ns_header != NULL) {
|
|
found = ns_header;
|
|
search->zonecut_sigrdataset = NULL;
|
|
}
|
|
|
|
if (found != NULL) {
|
|
/*
|
|
* We increment the reference count on node to ensure that
|
|
* search->zonecut_rdataset will still be valid later.
|
|
*/
|
|
new_reference(search->rbtdb, node);
|
|
search->zonecut = node;
|
|
search->zonecut_rdataset = found;
|
|
search->need_cleanup = ISC_TRUE;
|
|
/*
|
|
* Since we've found a zonecut, anything beneath it is
|
|
* glue and is not subject to wildcard matching, so we
|
|
* may clear search->wild.
|
|
*/
|
|
search->wild = ISC_FALSE;
|
|
if ((search->options & DNS_DBFIND_GLUEOK) == 0) {
|
|
/*
|
|
* If the caller does not want to find glue, then
|
|
* this is the best answer and the search should
|
|
* stop now.
|
|
*/
|
|
result = DNS_R_PARTIALMATCH;
|
|
} else {
|
|
dns_name_t *zcname;
|
|
|
|
/*
|
|
* The search will continue beneath the zone cut.
|
|
* This may or may not be the best match. In case it
|
|
* is, we need to remember the node name.
|
|
*/
|
|
zcname = dns_fixedname_name(&search->zonecut_name);
|
|
RUNTIME_CHECK(dns_name_copy(name, zcname, NULL) ==
|
|
ISC_R_SUCCESS);
|
|
search->copy_name = ISC_TRUE;
|
|
}
|
|
} else {
|
|
/*
|
|
* There is no zonecut at this node which is active in this
|
|
* version.
|
|
*
|
|
* If this is a "wild" node and the caller hasn't disabled
|
|
* wildcard matching, remember that we've seen a wild node
|
|
* in case we need to go searching for wildcard matches
|
|
* later on.
|
|
*/
|
|
if (node->wild && (search->options & DNS_DBFIND_NOWILD) == 0)
|
|
search->wild = ISC_TRUE;
|
|
}
|
|
|
|
NODE_UNLOCK(&(search->rbtdb->node_locks[node->locknum].lock),
|
|
isc_rwlocktype_read);
|
|
|
|
return (result);
|
|
}
|
|
|
|
static inline void
|
|
bind_rdataset(dns_rbtdb_t *rbtdb, dns_rbtnode_t *node,
|
|
rdatasetheader_t *header, isc_stdtime_t now,
|
|
dns_rdataset_t *rdataset)
|
|
{
|
|
unsigned char *raw; /* RDATASLAB */
|
|
|
|
/*
|
|
* 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);
|
|
|
|
INSIST(rdataset->methods == NULL); /* We must be disassociated. */
|
|
|
|
rdataset->methods = &rdataset_methods;
|
|
rdataset->rdclass = rbtdb->common.rdclass;
|
|
rdataset->type = RBTDB_RDATATYPE_BASE(header->type);
|
|
rdataset->covers = RBTDB_RDATATYPE_EXT(header->type);
|
|
rdataset->ttl = header->ttl - now;
|
|
rdataset->trust = header->trust;
|
|
if (NXDOMAIN(header))
|
|
rdataset->attributes |= DNS_RDATASETATTR_NXDOMAIN;
|
|
rdataset->private1 = rbtdb;
|
|
rdataset->private2 = node;
|
|
raw = (unsigned char *)header + sizeof(*header);
|
|
rdataset->private3 = raw;
|
|
rdataset->count = header->count++;
|
|
if (rdataset->count == ISC_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;
|
|
}
|
|
|
|
static inline isc_result_t
|
|
setup_delegation(rbtdb_search_t *search, dns_dbnode_t **nodep,
|
|
dns_name_t *foundname, dns_rdataset_t *rdataset,
|
|
dns_rdataset_t *sigrdataset)
|
|
{
|
|
isc_result_t result;
|
|
dns_name_t *zcname;
|
|
rbtdb_rdatatype_t type;
|
|
dns_rbtnode_t *node;
|
|
|
|
/*
|
|
* The caller MUST NOT be holding any node locks.
|
|
*/
|
|
|
|
node = search->zonecut;
|
|
type = search->zonecut_rdataset->type;
|
|
|
|
/*
|
|
* If we have to set foundname, we do it before anything else.
|
|
* If we were to set foundname after we had set nodep or bound the
|
|
* rdataset, then we'd have to undo that work if dns_name_copy()
|
|
* failed. By setting foundname first, there's nothing to undo if
|
|
* we have trouble.
|
|
*/
|
|
if (foundname != NULL && search->copy_name) {
|
|
zcname = dns_fixedname_name(&search->zonecut_name);
|
|
result = dns_name_copy(zcname, foundname, NULL);
|
|
if (result != ISC_R_SUCCESS)
|
|
return (result);
|
|
}
|
|
if (nodep != NULL) {
|
|
/*
|
|
* Note that we don't have to increment the node's reference
|
|
* count here because we're going to use the reference we
|
|
* already have in the search block.
|
|
*/
|
|
*nodep = node;
|
|
search->need_cleanup = ISC_FALSE;
|
|
}
|
|
if (rdataset != NULL) {
|
|
NODE_LOCK(&(search->rbtdb->node_locks[node->locknum].lock),
|
|
isc_rwlocktype_read);
|
|
bind_rdataset(search->rbtdb, node, search->zonecut_rdataset,
|
|
search->now, rdataset);
|
|
if (sigrdataset != NULL && search->zonecut_sigrdataset != NULL)
|
|
bind_rdataset(search->rbtdb, node,
|
|
search->zonecut_sigrdataset,
|
|
search->now, sigrdataset);
|
|
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 inline isc_boolean_t
|
|
valid_glue(rbtdb_search_t *search, dns_name_t *name, rbtdb_rdatatype_t type,
|
|
dns_rbtnode_t *node)
|
|
{
|
|
unsigned char *raw; /* RDATASLAB */
|
|
unsigned int count, size;
|
|
dns_name_t ns_name;
|
|
isc_boolean_t valid = ISC_FALSE;
|
|
dns_offsets_t offsets;
|
|
isc_region_t region;
|
|
rdatasetheader_t *header;
|
|
|
|
/*
|
|
* No additional locking is required.
|
|
*/
|
|
|
|
/*
|
|
* Valid glue types are A, AAAA, A6. NS is also a valid glue type
|
|
* if it occurs at a zone cut, but is not valid below it.
|
|
*/
|
|
if (type == dns_rdatatype_ns) {
|
|
if (node != search->zonecut) {
|
|
return (ISC_FALSE);
|
|
}
|
|
} else if (type != dns_rdatatype_a &&
|
|
type != dns_rdatatype_aaaa &&
|
|
type != dns_rdatatype_a6) {
|
|
return (ISC_FALSE);
|
|
}
|
|
|
|
header = search->zonecut_rdataset;
|
|
raw = (unsigned char *)header + sizeof(*header);
|
|
count = raw[0] * 256 + raw[1];
|
|
#if DNS_RDATASET_FIXED
|
|
raw += 2 + (4 * count);
|
|
#else
|
|
raw += 2;
|
|
#endif
|
|
|
|
while (count > 0) {
|
|
count--;
|
|
size = raw[0] * 256 + raw[1];
|
|
#if DNS_RDATASET_FIXED
|
|
raw += 4;
|
|
#else
|
|
raw += 2;
|
|
#endif
|
|
region.base = raw;
|
|
region.length = size;
|
|
raw += size;
|
|
/*
|
|
* XXX Until we have rdata structures, we have no choice but
|
|
* to directly access the rdata format.
|
|
*/
|
|
dns_name_init(&ns_name, offsets);
|
|
dns_name_fromregion(&ns_name, ®ion);
|
|
if (dns_name_compare(&ns_name, name) == 0) {
|
|
valid = ISC_TRUE;
|
|
break;
|
|
}
|
|
}
|
|
|
|
return (valid);
|
|
}
|
|
|
|
static inline isc_boolean_t
|
|
activeempty(rbtdb_search_t *search, dns_rbtnodechain_t *chain,
|
|
dns_name_t *name)
|
|
{
|
|
dns_fixedname_t fnext;
|
|
dns_fixedname_t forigin;
|
|
dns_name_t *next;
|
|
dns_name_t *origin;
|
|
dns_name_t prefix;
|
|
dns_rbtdb_t *rbtdb;
|
|
dns_rbtnode_t *node;
|
|
isc_result_t result;
|
|
isc_boolean_t answer = ISC_FALSE;
|
|
rdatasetheader_t *header;
|
|
|
|
rbtdb = search->rbtdb;
|
|
|
|
dns_name_init(&prefix, NULL);
|
|
dns_fixedname_init(&fnext);
|
|
next = dns_fixedname_name(&fnext);
|
|
dns_fixedname_init(&forigin);
|
|
origin = dns_fixedname_name(&forigin);
|
|
|
|
result = dns_rbtnodechain_next(chain, NULL, NULL);
|
|
while (result == ISC_R_SUCCESS || result == DNS_R_NEWORIGIN) {
|
|
node = NULL;
|
|
result = dns_rbtnodechain_current(chain, &prefix,
|
|
origin, &node);
|
|
if (result != ISC_R_SUCCESS)
|
|
break;
|
|
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 = ISC_TRUE;
|
|
return (answer);
|
|
}
|
|
|
|
static inline isc_boolean_t
|
|
activeemtpynode(rbtdb_search_t *search, dns_name_t *qname, dns_name_t *wname) {
|
|
dns_fixedname_t fnext;
|
|
dns_fixedname_t forigin;
|
|
dns_fixedname_t fprev;
|
|
dns_name_t *next;
|
|
dns_name_t *origin;
|
|
dns_name_t *prev;
|
|
dns_name_t name;
|
|
dns_name_t rname;
|
|
dns_name_t tname;
|
|
dns_rbtdb_t *rbtdb;
|
|
dns_rbtnode_t *node;
|
|
dns_rbtnodechain_t chain;
|
|
isc_boolean_t check_next = ISC_TRUE;
|
|
isc_boolean_t check_prev = ISC_TRUE;
|
|
isc_boolean_t answer = ISC_FALSE;
|
|
isc_result_t result;
|
|
rdatasetheader_t *header;
|
|
unsigned int n;
|
|
|
|
rbtdb = search->rbtdb;
|
|
|
|
dns_name_init(&name, NULL);
|
|
dns_name_init(&tname, NULL);
|
|
dns_name_init(&rname, NULL);
|
|
dns_fixedname_init(&fnext);
|
|
next = dns_fixedname_name(&fnext);
|
|
dns_fixedname_init(&fprev);
|
|
prev = dns_fixedname_name(&fprev);
|
|
dns_fixedname_init(&forigin);
|
|
origin = dns_fixedname_name(&forigin);
|
|
|
|
/*
|
|
* Find if qname is at or below a empty node.
|
|
* Use our own copy of the chain.
|
|
*/
|
|
|
|
chain = search->chain;
|
|
do {
|
|
node = NULL;
|
|
result = dns_rbtnodechain_current(&chain, &name,
|
|
origin, &node);
|
|
if (result != ISC_R_SUCCESS)
|
|
break;
|
|
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 = ISC_FALSE;
|
|
|
|
result = dns_rbtnodechain_next(&chain, NULL, NULL);
|
|
while (result == ISC_R_SUCCESS || result == DNS_R_NEWORIGIN) {
|
|
node = NULL;
|
|
result = dns_rbtnodechain_current(&chain, &name,
|
|
origin, &node);
|
|
if (result != ISC_R_SUCCESS)
|
|
break;
|
|
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 = ISC_FALSE;
|
|
|
|
dns_name_clone(qname, &rname);
|
|
|
|
/*
|
|
* Remove the wildcard label to find the terminal name.
|
|
*/
|
|
n = dns_name_countlabels(wname);
|
|
dns_name_getlabelsequence(wname, 1, n - 1, &tname);
|
|
|
|
do {
|
|
if ((check_prev && dns_name_issubdomain(prev, &rname)) ||
|
|
(check_next && dns_name_issubdomain(next, &rname))) {
|
|
answer = ISC_TRUE;
|
|
break;
|
|
}
|
|
/*
|
|
* Remove the left hand label.
|
|
*/
|
|
n = dns_name_countlabels(&rname);
|
|
dns_name_getlabelsequence(&rname, 1, n - 1, &rname);
|
|
} while (!dns_name_equal(&rname, &tname));
|
|
return (answer);
|
|
}
|
|
|
|
static inline isc_result_t
|
|
find_wildcard(rbtdb_search_t *search, dns_rbtnode_t **nodep,
|
|
dns_name_t *qname)
|
|
{
|
|
unsigned int i, j;
|
|
dns_rbtnode_t *node, *level_node, *wnode;
|
|
rdatasetheader_t *header;
|
|
isc_result_t result = ISC_R_NOTFOUND;
|
|
dns_name_t name;
|
|
dns_name_t *wname;
|
|
dns_fixedname_t fwname;
|
|
dns_rbtdb_t *rbtdb;
|
|
isc_boolean_t done, wild, active;
|
|
dns_rbtnodechain_t wchain;
|
|
|
|
/*
|
|
* Caller must be holding the tree lock and MUST NOT be holding
|
|
* any node locks.
|
|
*/
|
|
|
|
/*
|
|
* Examine each ancestor level. If the level's wild bit
|
|
* is set, then construct the corresponding wildcard name and
|
|
* search for it. If the wildcard node exists, and is active in
|
|
* this version, we're done. If not, then we next check to see
|
|
* if the ancestor is active in this version. If so, then there
|
|
* can be no possible wildcard match and again we're done. If not,
|
|
* continue the search.
|
|
*/
|
|
|
|
rbtdb = search->rbtdb;
|
|
i = search->chain.level_matches;
|
|
done = ISC_FALSE;
|
|
node = *nodep;
|
|
do {
|
|
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))
|
|
break;
|
|
}
|
|
if (header != NULL)
|
|
active = ISC_TRUE;
|
|
else
|
|
active = ISC_FALSE;
|
|
|
|
if (node->wild)
|
|
wild = ISC_TRUE;
|
|
else
|
|
wild = ISC_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);
|
|
dns_fixedname_init(&fwname);
|
|
wname = dns_fixedname_name(&fwname);
|
|
result = dns_name_concatenate(dns_wildcardname, &name,
|
|
wname, NULL);
|
|
j = i;
|
|
while (result == ISC_R_SUCCESS && j != 0) {
|
|
j--;
|
|
level_node = search->chain.levels[j];
|
|
dns_name_init(&name, NULL);
|
|
dns_rbt_namefromnode(level_node, &name);
|
|
result = dns_name_concatenate(wname,
|
|
&name,
|
|
wname,
|
|
NULL);
|
|
}
|
|
if (result != ISC_R_SUCCESS)
|
|
break;
|
|
|
|
wnode = NULL;
|
|
dns_rbtnodechain_init(&wchain, NULL);
|
|
result = dns_rbt_findnode(rbtdb->tree, wname,
|
|
NULL, &wnode, &wchain,
|
|
DNS_RBTFIND_EMPTYDATA,
|
|
NULL, NULL);
|
|
if (result == ISC_R_SUCCESS) {
|
|
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))
|
|
break;
|
|
}
|
|
NODE_UNLOCK(lock, isc_rwlocktype_read);
|
|
if (header != NULL ||
|
|
activeempty(search, &wchain, wname)) {
|
|
if (activeemtpynode(search, qname,
|
|
wname)) {
|
|
return (ISC_R_NOTFOUND);
|
|
}
|
|
/*
|
|
* The wildcard node is active!
|
|
*
|
|
* Note: result is still ISC_R_SUCCESS
|
|
* so we don't have to set it.
|
|
*/
|
|
*nodep = wnode;
|
|
break;
|
|
}
|
|
} else if (result != ISC_R_NOTFOUND &&
|
|
result != DNS_R_PARTIALMATCH) {
|
|
/*
|
|
* An error has occurred. Bail out.
|
|
*/
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (active) {
|
|
/*
|
|
* The level node is active. Any wildcarding
|
|
* present at higher levels has no
|
|
* effect and we're done.
|
|
*/
|
|
result = ISC_R_NOTFOUND;
|
|
break;
|
|
}
|
|
|
|
if (i > 0) {
|
|
i--;
|
|
node = search->chain.levels[i];
|
|
} else
|
|
done = ISC_TRUE;
|
|
} while (!done);
|
|
|
|
return (result);
|
|
}
|
|
|
|
static inline isc_result_t
|
|
find_closest_nsec(rbtdb_search_t *search, dns_dbnode_t **nodep,
|
|
dns_name_t *foundname, dns_rdataset_t *rdataset,
|
|
dns_rdataset_t *sigrdataset, isc_boolean_t need_sig)
|
|
{
|
|
dns_rbtnode_t *node;
|
|
rdatasetheader_t *header, *header_next, *found, *foundsig;
|
|
isc_boolean_t empty_node;
|
|
isc_result_t result;
|
|
dns_fixedname_t fname, forigin;
|
|
dns_name_t *name, *origin;
|
|
|
|
do {
|
|
node = NULL;
|
|
dns_fixedname_init(&fname);
|
|
name = dns_fixedname_name(&fname);
|
|
dns_fixedname_init(&forigin);
|
|
origin = dns_fixedname_name(&forigin);
|
|
result = dns_rbtnodechain_current(&search->chain, name,
|
|
origin, &node);
|
|
if (result != ISC_R_SUCCESS)
|
|
return (result);
|
|
NODE_LOCK(&(search->rbtdb->node_locks[node->locknum].lock),
|
|
isc_rwlocktype_read);
|
|
found = NULL;
|
|
foundsig = NULL;
|
|
empty_node = ISC_TRUE;
|
|
for (header = node->data;
|
|
header != NULL;
|
|
header = header_next) {
|
|
header_next = header->next;
|
|
/*
|
|
* Look for an active, extant NSEC or RRSIG NSEC.
|
|
*/
|
|
do {
|
|
if (header->serial <= search->serial &&
|
|
!IGNORE(header)) {
|
|
/*
|
|
* Is this a "this rdataset doesn't
|
|
* exist" record?
|
|
*/
|
|
if (NONEXISTENT(header))
|
|
header = NULL;
|
|
break;
|
|
} else
|
|
header = header->down;
|
|
} while (header != NULL);
|
|
if (header != NULL) {
|
|
/*
|
|
* We now know that there is at least one
|
|
* active rdataset at this node.
|
|
*/
|
|
empty_node = ISC_FALSE;
|
|
if (header->type == dns_rdatatype_nsec) {
|
|
found = header;
|
|
if (foundsig != NULL)
|
|
break;
|
|
} else if (header->type ==
|
|
RBTDB_RDATATYPE_SIGNSEC) {
|
|
foundsig = header;
|
|
if (found != NULL)
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
if (!empty_node) {
|
|
if (found != NULL &&
|
|
(foundsig != NULL || !need_sig))
|
|
{
|
|
/*
|
|
* We've found the right NSEC record.
|
|
*
|
|
* Note: for this to really be the right
|
|
* NSEC record, it's essential that the NSEC
|
|
* records of any nodes obscured by a zone
|
|
* cut have been removed; we assume this is
|
|
* the case.
|
|
*/
|
|
result = dns_name_concatenate(name, origin,
|
|
foundname, NULL);
|
|
if (result == ISC_R_SUCCESS) {
|
|
if (nodep != NULL) {
|
|
new_reference(search->rbtdb,
|
|
node);
|
|
*nodep = node;
|
|
}
|
|
bind_rdataset(search->rbtdb, node,
|
|
found, search->now,
|
|
rdataset);
|
|
if (foundsig != NULL)
|
|
bind_rdataset(search->rbtdb,
|
|
node,
|
|
foundsig,
|
|
search->now,
|
|
sigrdataset);
|
|
}
|
|
} else if (found == NULL && foundsig == NULL) {
|
|
/*
|
|
* This node is active, but has no NSEC or
|
|
* RRSIG NSEC. That means it's glue or
|
|
* other obscured zone data that isn't
|
|
* relevant for our search. Treat the
|
|
* node as if it were empty and keep looking.
|
|
*/
|
|
empty_node = ISC_TRUE;
|
|
result = dns_rbtnodechain_prev(&search->chain,
|
|
NULL, NULL);
|
|
} else {
|
|
/*
|
|
* We found an active node, but either the
|
|
* NSEC or the RRSIG NSEC is missing. This
|
|
* shouldn't happen.
|
|
*/
|
|
result = DNS_R_BADDB;
|
|
}
|
|
} else {
|
|
/*
|
|
* This node isn't active. We've got to keep
|
|
* looking.
|
|
*/
|
|
result = dns_rbtnodechain_prev(&search->chain, NULL,
|
|
NULL);
|
|
}
|
|
NODE_UNLOCK(&(search->rbtdb->node_locks[node->locknum].lock),
|
|
isc_rwlocktype_read);
|
|
} while (empty_node && result == ISC_R_SUCCESS);
|
|
|
|
/*
|
|
* If the result is ISC_R_NOMORE, then we got to the beginning of
|
|
* the database and didn't find a NSEC record. This shouldn't
|
|
* happen.
|
|
*/
|
|
if (result == ISC_R_NOMORE)
|
|
result = DNS_R_BADDB;
|
|
|
|
return (result);
|
|
}
|
|
|
|
static isc_result_t
|
|
zone_find(dns_db_t *db, dns_name_t *name, dns_dbversion_t *version,
|
|
dns_rdatatype_t type, unsigned int options, isc_stdtime_t now,
|
|
dns_dbnode_t **nodep, dns_name_t *foundname,
|
|
dns_rdataset_t *rdataset, dns_rdataset_t *sigrdataset)
|
|
{
|
|
dns_rbtnode_t *node = NULL;
|
|
isc_result_t result;
|
|
rbtdb_search_t search;
|
|
isc_boolean_t cname_ok = ISC_TRUE;
|
|
isc_boolean_t close_version = ISC_FALSE;
|
|
isc_boolean_t maybe_zonecut = ISC_FALSE;
|
|
isc_boolean_t at_zonecut = ISC_FALSE;
|
|
isc_boolean_t wild;
|
|
isc_boolean_t empty_node;
|
|
rdatasetheader_t *header, *header_next, *found, *nsecheader;
|
|
rdatasetheader_t *foundsig, *cnamesig, *nsecsig;
|
|
rbtdb_rdatatype_t sigtype;
|
|
isc_boolean_t active;
|
|
dns_rbtnodechain_t chain;
|
|
nodelock_t *lock;
|
|
|
|
|
|
search.rbtdb = (dns_rbtdb_t *)db;
|
|
|
|
REQUIRE(VALID_RBTDB(search.rbtdb));
|
|
|
|
/*
|
|
* We don't care about 'now'.
|
|
*/
|
|
UNUSED(now);
|
|
|
|
/*
|
|
* If the caller didn't supply a version, attach to the current
|
|
* version.
|
|
*/
|
|
if (version == NULL) {
|
|
currentversion(db, &version);
|
|
close_version = ISC_TRUE;
|
|
}
|
|
|
|
search.rbtversion = version;
|
|
search.serial = search.rbtversion->serial;
|
|
search.options = options;
|
|
search.copy_name = ISC_FALSE;
|
|
search.need_cleanup = ISC_FALSE;
|
|
search.wild = ISC_FALSE;
|
|
search.zonecut = NULL;
|
|
dns_fixedname_init(&search.zonecut_name);
|
|
dns_rbtnodechain_init(&search.chain, search.rbtdb->common.mctx);
|
|
search.now = 0;
|
|
|
|
/*
|
|
* 'wild' will be true iff. we've matched a wildcard.
|
|
*/
|
|
wild = ISC_FALSE;
|
|
|
|
RWLOCK(&search.rbtdb->tree_lock, isc_rwlocktype_read);
|
|
|
|
/*
|
|
* Search down from the root of the tree. If, while going down, we
|
|
* encounter a callback node, zone_zonecut_callback() will search the
|
|
* rdatasets at the zone cut for active DNAME or NS rdatasets.
|
|
*/
|
|
result = dns_rbt_findnode(search.rbtdb->tree, name, foundname, &node,
|
|
&search.chain, DNS_RBTFIND_EMPTYDATA,
|
|
zone_zonecut_callback, &search);
|
|
|
|
if (result == DNS_R_PARTIALMATCH) {
|
|
partial_match:
|
|
if (search.zonecut != NULL) {
|
|
result = setup_delegation(&search, nodep, foundname,
|
|
rdataset, sigrdataset);
|
|
goto tree_exit;
|
|
}
|
|
|
|
if (search.wild) {
|
|
/*
|
|
* At least one of the levels in the search chain
|
|
* potentially has a wildcard. For each such level,
|
|
* we must see if there's a matching wildcard active
|
|
* in the current version.
|
|
*/
|
|
result = find_wildcard(&search, &node, name);
|
|
if (result == ISC_R_SUCCESS) {
|
|
result = dns_name_copy(name, foundname, NULL);
|
|
if (result != ISC_R_SUCCESS)
|
|
goto tree_exit;
|
|
wild = ISC_TRUE;
|
|
goto found;
|
|
}
|
|
else if (result != ISC_R_NOTFOUND)
|
|
goto tree_exit;
|
|
}
|
|
|
|
chain = search.chain;
|
|
active = activeempty(&search, &chain, name);
|
|
|
|
/*
|
|
* If we're here, then the name does not exist, is not
|
|
* beneath a zonecut, and there's no matching wildcard.
|
|
*/
|
|
if (search.rbtdb->secure ||
|
|
(search.options & DNS_DBFIND_FORCENSEC) != 0)
|
|
{
|
|
result = find_closest_nsec(&search, nodep, foundname,
|
|
rdataset, sigrdataset,
|
|
search.rbtdb->secure);
|
|
if (result == ISC_R_SUCCESS)
|
|
result = active ? DNS_R_EMPTYNAME :
|
|
DNS_R_NXDOMAIN;
|
|
} else
|
|
result = active ? DNS_R_EMPTYNAME : DNS_R_NXDOMAIN;
|
|
goto tree_exit;
|
|
} else if (result != ISC_R_SUCCESS)
|
|
goto tree_exit;
|
|
|
|
found:
|
|
/*
|
|
* We have found a node whose name is the desired name, or we
|
|
* have matched a wildcard.
|
|
*/
|
|
|
|
if (search.zonecut != NULL) {
|
|
/*
|
|
* If we're beneath a zone cut, we don't want to look for
|
|
* CNAMEs because they're not legitimate zone glue.
|
|
*/
|
|
cname_ok = ISC_FALSE;
|
|
} else {
|
|
/*
|
|
* The node may be a zone cut itself. If it might be one,
|
|
* make sure we check for it later.
|
|
*/
|
|
if (node->find_callback &&
|
|
(node != search.rbtdb->origin_node ||
|
|
IS_STUB(search.rbtdb)) &&
|
|
!dns_rdatatype_atparent(type))
|
|
maybe_zonecut = ISC_TRUE;
|
|
}
|
|
|
|
/*
|
|
* Certain DNSSEC types are not subject to CNAME matching
|
|
* (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 = ISC_FALSE;
|
|
|
|
/*
|
|
* We now go looking for rdata...
|
|
*/
|
|
|
|
NODE_LOCK(&(search.rbtdb->node_locks[node->locknum].lock),
|
|
isc_rwlocktype_read);
|
|
|
|
found = NULL;
|
|
foundsig = NULL;
|
|
sigtype = RBTDB_RDATATYPE_VALUE(dns_rdatatype_rrsig, type);
|
|
nsecheader = NULL;
|
|
nsecsig = NULL;
|
|
cnamesig = NULL;
|
|
empty_node = ISC_TRUE;
|
|
for (header = node->data; header != NULL; header = header_next) {
|
|
header_next = header->next;
|
|
/*
|
|
* Look for an active, extant rdataset.
|
|
*/
|
|
do {
|
|
if (header->serial <= search.serial &&
|
|
!IGNORE(header)) {
|
|
/*
|
|
* Is this a "this rdataset doesn't
|
|
* exist" record?
|
|
*/
|
|
if (NONEXISTENT(header))
|
|
header = NULL;
|
|
break;
|
|
} else
|
|
header = header->down;
|
|
} while (header != NULL);
|
|
if (header != NULL) {
|
|
/*
|
|
* We now know that there is at least one active
|
|
* rdataset at this node.
|
|
*/
|
|
empty_node = ISC_FALSE;
|
|
|
|
/*
|
|
* Do special zone cut handling, if requested.
|
|
*/
|
|
if (maybe_zonecut &&
|
|
header->type == dns_rdatatype_ns) {
|
|
/*
|
|
* We increment the reference count on node to
|
|
* ensure that search->zonecut_rdataset will
|
|
* still be valid later.
|
|
*/
|
|
new_reference(search.rbtdb, node);
|
|
search.zonecut = node;
|
|
search.zonecut_rdataset = header;
|
|
search.zonecut_sigrdataset = NULL;
|
|
search.need_cleanup = ISC_TRUE;
|
|
maybe_zonecut = ISC_FALSE;
|
|
at_zonecut = ISC_TRUE;
|
|
/*
|
|
* 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 we found a type we were looking for,
|
|
* remember it.
|
|
*/
|
|
if (header->type == type ||
|
|
type == dns_rdatatype_any ||
|
|
(header->type == dns_rdatatype_cname &&
|
|
cname_ok)) {
|
|
/*
|
|
* We've found the answer!
|
|
*/
|
|
found = header;
|
|
if (header->type == dns_rdatatype_cname &&
|
|
cname_ok) {
|
|
/*
|
|
* We may be finding a CNAME instead
|
|
* of the desired type.
|
|
*
|
|
* If we've already got the CNAME RRSIG,
|
|
* use it, otherwise change sigtype
|
|
* so that we find it.
|
|
*/
|
|
if (cnamesig != NULL)
|
|
foundsig = cnamesig;
|
|
else
|
|
sigtype =
|
|
RBTDB_RDATATYPE_SIGCNAME;
|
|
}
|
|
/*
|
|
* If we've got all we need, end the search.
|
|
*/
|
|
if (!maybe_zonecut && foundsig != NULL)
|
|
break;
|
|
} else if (header->type == sigtype) {
|
|
/*
|
|
* We've found the RRSIG rdataset for our
|
|
* target type. Remember it.
|
|
*/
|
|
foundsig = header;
|
|
/*
|
|
* If we've got all we need, end the search.
|
|
*/
|
|
if (!maybe_zonecut && found != NULL)
|
|
break;
|
|
} else if (header->type == dns_rdatatype_nsec) {
|
|
/*
|
|
* Remember a NSEC rdataset even if we're
|
|
* not specifically looking for it, because
|
|
* we might need it later.
|
|
*/
|
|
nsecheader = header;
|
|
} else if (header->type == RBTDB_RDATATYPE_SIGNSEC) {
|
|
/*
|
|
* If we need the NSEC rdataset, we'll also
|
|
* need its signature.
|
|
*/
|
|
nsecsig = header;
|
|
} else if (cname_ok &&
|
|
header->type == RBTDB_RDATATYPE_SIGCNAME) {
|
|
/*
|
|
* If we get a CNAME match, we'll also need
|
|
* its signature.
|
|
*/
|
|
cnamesig = header;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (empty_node) {
|
|
/*
|
|
* We have an exact match for the name, but there are no
|
|
* active rdatasets in the desired version. That means that
|
|
* this node doesn't exist in the desired version, and that
|
|
* we really have a partial match.
|
|
*/
|
|
if (!wild) {
|
|
lock = &search.rbtdb->node_locks[node->locknum].lock;
|
|
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.
|
|
*/
|
|
lock = &search.rbtdb->node_locks[node->locknum].lock;
|
|
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.rbtdb->secure &&
|
|
(nsecheader == NULL || nsecsig == NULL)) {
|
|
/*
|
|
* The zone is secure but there's no NSEC,
|
|
* or the NSEC has no signature!
|
|
*/
|
|
if (!wild) {
|
|
result = DNS_R_BADDB;
|
|
goto node_exit;
|
|
}
|
|
|
|
lock = &search.rbtdb->node_locks[node->locknum].lock;
|
|
NODE_UNLOCK(lock, isc_rwlocktype_read);
|
|
result = find_closest_nsec(&search, nodep, foundname,
|
|
rdataset, sigrdataset,
|
|
search.rbtdb->secure);
|
|
if (result == ISC_R_SUCCESS)
|
|
result = DNS_R_EMPTYWILD;
|
|
goto tree_exit;
|
|
}
|
|
if ((search.options & DNS_DBFIND_FORCENSEC) != 0 &&
|
|
nsecheader == NULL)
|
|
{
|
|
/*
|
|
* There's no NSEC record, and we were told
|
|
* to find one.
|
|
*/
|
|
result = DNS_R_BADDB;
|
|
goto node_exit;
|
|
}
|
|
if (nodep != NULL) {
|
|
new_reference(search.rbtdb, node);
|
|
*nodep = node;
|
|
}
|
|
if (search.rbtdb->secure ||
|
|
(search.options & DNS_DBFIND_FORCENSEC) != 0)
|
|
{
|
|
bind_rdataset(search.rbtdb, node, nsecheader,
|
|
0, rdataset);
|
|
if (nsecsig != NULL)
|
|
bind_rdataset(search.rbtdb, node,
|
|
nsecsig, 0, sigrdataset);
|
|
}
|
|
if (wild)
|
|
foundname->attributes |= DNS_NAMEATTR_WILDCARD;
|
|
goto node_exit;
|
|
}
|
|
|
|
/*
|
|
* We found what we were looking for, or we found a CNAME.
|
|
*/
|
|
|
|
if (type != found->type &&
|
|
type != dns_rdatatype_any &&
|
|
found->type == dns_rdatatype_cname) {
|
|
/*
|
|
* We weren't doing an ANY query and we found a CNAME instead
|
|
* of the type we were looking for, so we need to indicate
|
|
* that result to the caller.
|
|
*/
|
|
result = DNS_R_CNAME;
|
|
} else if (search.zonecut != NULL) {
|
|
/*
|
|
* If we're beneath a zone cut, we must indicate that the
|
|
* result is glue, unless we're actually at the zone cut
|
|
* and the type is NSEC or KEY.
|
|
*/
|
|
if (search.zonecut == node) {
|
|
/*
|
|
* 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_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)) {
|
|
lock = &search.rbtdb->node_locks[node->locknum].lock;
|
|
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);
|
|
else
|
|
search.need_cleanup = ISC_FALSE;
|
|
*nodep = node;
|
|
}
|
|
|
|
if (type != dns_rdatatype_any) {
|
|
bind_rdataset(search.rbtdb, node, found, 0, rdataset);
|
|
if (foundsig != NULL)
|
|
bind_rdataset(search.rbtdb, node, foundsig, 0,
|
|
sigrdataset);
|
|
}
|
|
|
|
if (wild)
|
|
foundname->attributes |= DNS_NAMEATTR_WILDCARD;
|
|
|
|
node_exit:
|
|
NODE_UNLOCK(&(search.rbtdb->node_locks[node->locknum].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;
|
|
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);
|
|
NODE_UNLOCK(lock, isc_rwlocktype_read);
|
|
}
|
|
|
|
if (close_version)
|
|
closeversion(db, &version, ISC_FALSE);
|
|
|
|
dns_rbtnodechain_reset(&search.chain);
|
|
|
|
return (result);
|
|
}
|
|
|
|
static isc_result_t
|
|
zone_findzonecut(dns_db_t *db, dns_name_t *name, unsigned int options,
|
|
isc_stdtime_t now, dns_dbnode_t **nodep,
|
|
dns_name_t *foundname,
|
|
dns_rdataset_t *rdataset, dns_rdataset_t *sigrdataset)
|
|
{
|
|
UNUSED(db);
|
|
UNUSED(name);
|
|
UNUSED(options);
|
|
UNUSED(now);
|
|
UNUSED(nodep);
|
|
UNUSED(foundname);
|
|
UNUSED(rdataset);
|
|
UNUSED(sigrdataset);
|
|
|
|
FATAL_ERROR(__FILE__, __LINE__, "zone_findzonecut() called!");
|
|
|
|
return (ISC_R_NOTIMPLEMENTED);
|
|
}
|
|
|
|
static isc_result_t
|
|
cache_zonecut_callback(dns_rbtnode_t *node, dns_name_t *name, void *arg) {
|
|
rbtdb_search_t *search = arg;
|
|
rdatasetheader_t *header, *header_prev, *header_next;
|
|
rdatasetheader_t *dname_header, *sigdname_header;
|
|
isc_result_t result;
|
|
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 (header->ttl <= search->now) {
|
|
/*
|
|
* This rdataset is stale. If no one else is
|
|
* using the node, we can clean it up right
|
|
* now, otherwise we mark it as stale, and
|
|
* the node as dirty, so it will get cleaned
|
|
* up later.
|
|
*/
|
|
if ((header->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 (dns_rbtnode_refcurrent(node) == 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(mctx, header);
|
|
if (header_prev != NULL)
|
|
header_prev->next =
|
|
header->next;
|
|
else
|
|
node->data = header->next;
|
|
free_rdataset(mctx, header);
|
|
} else {
|
|
header->attributes |=
|
|
RDATASET_ATTR_STALE;
|
|
node->dirty = 1;
|
|
header_prev = header;
|
|
}
|
|
} else
|
|
header_prev = header;
|
|
} else if (header->type == dns_rdatatype_dname &&
|
|
EXISTS(header)) {
|
|
dname_header = header;
|
|
header_prev = header;
|
|
} else if (header->type == RBTDB_RDATATYPE_SIGDNAME &&
|
|
EXISTS(header)) {
|
|
sigdname_header = header;
|
|
header_prev = header;
|
|
} else
|
|
header_prev = header;
|
|
}
|
|
|
|
if (dname_header != NULL &&
|
|
(dname_header->trust != dns_trust_pending ||
|
|
(search->options & DNS_DBFIND_PENDINGOK) != 0)) {
|
|
/*
|
|
* We increment the reference count on node to ensure that
|
|
* search->zonecut_rdataset will still be valid later.
|
|
*/
|
|
new_reference(search->rbtdb, node);
|
|
search->zonecut = node;
|
|
search->zonecut_rdataset = dname_header;
|
|
search->zonecut_sigrdataset = sigdname_header;
|
|
search->need_cleanup = ISC_TRUE;
|
|
result = DNS_R_PARTIALMATCH;
|
|
} else
|
|
result = DNS_R_CONTINUE;
|
|
|
|
NODE_UNLOCK(lock, locktype);
|
|
|
|
return (result);
|
|
}
|
|
|
|
static inline isc_result_t
|
|
find_deepest_zonecut(rbtdb_search_t *search, dns_rbtnode_t *node,
|
|
dns_dbnode_t **nodep, dns_name_t *foundname,
|
|
dns_rdataset_t *rdataset, dns_rdataset_t *sigrdataset)
|
|
{
|
|
unsigned int i;
|
|
dns_rbtnode_t *level_node;
|
|
rdatasetheader_t *header, *header_prev, *header_next;
|
|
rdatasetheader_t *found, *foundsig;
|
|
isc_result_t result = ISC_R_NOTFOUND;
|
|
dns_name_t name;
|
|
dns_rbtdb_t *rbtdb;
|
|
isc_boolean_t done;
|
|
nodelock_t *lock;
|
|
isc_rwlocktype_t locktype;
|
|
|
|
/*
|
|
* Caller must be holding the tree lock.
|
|
*/
|
|
|
|
rbtdb = search->rbtdb;
|
|
i = search->chain.level_matches;
|
|
done = ISC_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 (header->ttl <= search->now) {
|
|
/*
|
|
* This rdataset is stale. If no one else is
|
|
* using the node, we can clean it up right
|
|
* now, otherwise we mark it as stale, and
|
|
* the node as dirty, so it will get cleaned
|
|
* up later.
|
|
*/
|
|
if ((header->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.
|
|
*/
|
|
locktype = isc_rwlocktype_write;
|
|
|
|
if (dns_rbtnode_refcurrent(node)
|
|
== 0) {
|
|
isc_mem_t *m;
|
|
|
|
m = search->rbtdb->common.mctx;
|
|
clean_stale_headers(m, header);
|
|
if (header_prev != NULL)
|
|
header_prev->next =
|
|
header->next;
|
|
else
|
|
node->data =
|
|
header->next;
|
|
free_rdataset(m, header);
|
|
} else {
|
|
header->attributes |=
|
|
RDATASET_ATTR_STALE;
|
|
node->dirty = 1;
|
|
header_prev = header;
|
|
}
|
|
} else
|
|
header_prev = header;
|
|
} else if (EXISTS(header)) {
|
|
/*
|
|
* We've found an extant rdataset. See if
|
|
* we're interested in it.
|
|
*/
|
|
if (header->type == dns_rdatatype_ns) {
|
|
found = header;
|
|
if (foundsig != NULL)
|
|
break;
|
|
} else if (header->type ==
|
|
RBTDB_RDATATYPE_SIGNS) {
|
|
foundsig = header;
|
|
if (found != NULL)
|
|
break;
|
|
}
|
|
header_prev = header;
|
|
} else
|
|
header_prev = header;
|
|
}
|
|
|
|
if (found != NULL) {
|
|
/*
|
|
* If we have to set foundname, we do it before
|
|
* anything else. If we were to set foundname after
|
|
* we had set nodep or bound the rdataset, then we'd
|
|
* have to undo that work if dns_name_concatenate()
|
|
* failed. By setting foundname first, there's
|
|
* nothing to undo if we have trouble.
|
|
*/
|
|
if (foundname != NULL) {
|
|
dns_name_init(&name, NULL);
|
|
dns_rbt_namefromnode(node, &name);
|
|
result = dns_name_copy(&name, foundname, NULL);
|
|
while (result == ISC_R_SUCCESS && i > 0) {
|
|
i--;
|
|
level_node = search->chain.levels[i];
|
|
dns_name_init(&name, NULL);
|
|
dns_rbt_namefromnode(level_node,
|
|
&name);
|
|
result =
|
|
dns_name_concatenate(foundname,
|
|
&name,
|
|
foundname,
|
|
NULL);
|
|
}
|
|
if (result != ISC_R_SUCCESS) {
|
|
*nodep = NULL;
|
|
goto node_exit;
|
|
}
|
|
}
|
|
result = DNS_R_DELEGATION;
|
|
if (nodep != NULL) {
|
|
new_reference(search->rbtdb, node);
|
|
*nodep = node;
|
|
}
|
|
bind_rdataset(search->rbtdb, node, found, search->now,
|
|
rdataset);
|
|
if (foundsig != NULL)
|
|
bind_rdataset(search->rbtdb, node, foundsig,
|
|
search->now, sigrdataset);
|
|
}
|
|
|
|
node_exit:
|
|
NODE_UNLOCK(lock, locktype);
|
|
|
|
if (found == NULL && i > 0) {
|
|
i--;
|
|
node = search->chain.levels[i];
|
|
} else
|
|
done = ISC_TRUE;
|
|
|
|
} while (!done);
|
|
|
|
return (result);
|
|
}
|
|
|
|
static isc_result_t
|
|
find_coveringnsec(rbtdb_search_t *search, dns_dbnode_t **nodep,
|
|
isc_stdtime_t now, dns_name_t *foundname,
|
|
dns_rdataset_t *rdataset, dns_rdataset_t *sigrdataset)
|
|
{
|
|
dns_rbtnode_t *node;
|
|
rdatasetheader_t *header, *header_next, *header_prev;
|
|
rdatasetheader_t *found, *foundsig;
|
|
isc_boolean_t empty_node;
|
|
isc_result_t result;
|
|
dns_fixedname_t fname, forigin;
|
|
dns_name_t *name, *origin;
|
|
rbtdb_rdatatype_t matchtype, sigmatchtype;
|
|
nodelock_t *lock;
|
|
isc_rwlocktype_t locktype;
|
|
|
|
matchtype = RBTDB_RDATATYPE_VALUE(dns_rdatatype_nsec, 0);
|
|
sigmatchtype = RBTDB_RDATATYPE_VALUE(dns_rdatatype_rrsig,
|
|
dns_rdatatype_nsec);
|
|
|
|
do {
|
|
node = NULL;
|
|
dns_fixedname_init(&fname);
|
|
name = dns_fixedname_name(&fname);
|
|
dns_fixedname_init(&forigin);
|
|
origin = dns_fixedname_name(&forigin);
|
|
result = dns_rbtnodechain_current(&search->chain, name,
|
|
origin, &node);
|
|
if (result != ISC_R_SUCCESS)
|
|
return (result);
|
|
locktype = isc_rwlocktype_read;
|
|
lock = &(search->rbtdb->node_locks[node->locknum].lock);
|
|
NODE_LOCK(lock, locktype);
|
|
found = NULL;
|
|
foundsig = NULL;
|
|
empty_node = ISC_TRUE;
|
|
header_prev = NULL;
|
|
for (header = node->data;
|
|
header != NULL;
|
|
header = header_next) {
|
|
header_next = header->next;
|
|
if (header->ttl <= now) {
|
|
/*
|
|
* This rdataset is stale. If no one else is
|
|
* using the node, we can clean it up right
|
|
* now, otherwise we mark it as stale, and the
|
|
* node as dirty, so it will get cleaned up
|
|
* later.
|
|
*/
|
|
if ((header->ttl <= 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;
|
|
|
|
if (dns_rbtnode_refcurrent(node)
|
|
== 0) {
|
|
isc_mem_t *m;
|
|
|
|
m = search->rbtdb->common.mctx;
|
|
clean_stale_headers(m, header);
|
|
if (header_prev != NULL)
|
|
header_prev->next =
|
|
header->next;
|
|
else
|
|
node->data = header->next;
|
|
free_rdataset(m, header);
|
|
} else {
|
|
header->attributes |=
|
|
RDATASET_ATTR_STALE;
|
|
node->dirty = 1;
|
|
header_prev = header;
|
|
}
|
|
} else
|
|
header_prev = header;
|
|
continue;
|
|
}
|
|
if (NONEXISTENT(header) ||
|
|
RBTDB_RDATATYPE_BASE(header->type) == 0) {
|
|
header_prev = header;
|
|
continue;
|
|
}
|
|
empty_node = ISC_FALSE;
|
|
if (header->type == matchtype)
|
|
found = header;
|
|
else if (header->type == sigmatchtype)
|
|
foundsig = header;
|
|
header_prev = header;
|
|
}
|
|
if (found != NULL) {
|
|
result = dns_name_concatenate(name, origin,
|
|
foundname, NULL);
|
|
if (result != ISC_R_SUCCESS)
|
|
goto unlock_node;
|
|
bind_rdataset(search->rbtdb, node, found,
|
|
now, rdataset);
|
|
if (foundsig != NULL)
|
|
bind_rdataset(search->rbtdb, node, foundsig,
|
|
now, sigrdataset);
|
|
new_reference(search->rbtdb, node);
|
|
*nodep = node;
|
|
result = DNS_R_COVERINGNSEC;
|
|
} else if (!empty_node) {
|
|
result = ISC_R_NOTFOUND;
|
|
} else
|
|
result = dns_rbtnodechain_prev(&search->chain, NULL,
|
|
NULL);
|
|
unlock_node:
|
|
NODE_UNLOCK(lock, locktype);
|
|
} while (empty_node && result == ISC_R_SUCCESS);
|
|
return (result);
|
|
}
|
|
|
|
static isc_result_t
|
|
cache_find(dns_db_t *db, dns_name_t *name, dns_dbversion_t *version,
|
|
dns_rdatatype_t type, unsigned int options, isc_stdtime_t now,
|
|
dns_dbnode_t **nodep, dns_name_t *foundname,
|
|
dns_rdataset_t *rdataset, dns_rdataset_t *sigrdataset)
|
|
{
|
|
dns_rbtnode_t *node = NULL;
|
|
isc_result_t result;
|
|
rbtdb_search_t search;
|
|
isc_boolean_t cname_ok = ISC_TRUE;
|
|
isc_boolean_t empty_node;
|
|
nodelock_t *lock;
|
|
isc_rwlocktype_t locktype;
|
|
rdatasetheader_t *header, *header_prev, *header_next;
|
|
rdatasetheader_t *found, *nsheader;
|
|
rdatasetheader_t *foundsig, *nssig, *cnamesig;
|
|
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 = ISC_FALSE;
|
|
search.need_cleanup = ISC_FALSE;
|
|
search.wild = ISC_FALSE;
|
|
search.zonecut = NULL;
|
|
dns_fixedname_init(&search.zonecut_name);
|
|
dns_rbtnodechain_init(&search.chain, search.rbtdb->common.mctx);
|
|
search.now = now;
|
|
|
|
RWLOCK(&search.rbtdb->tree_lock, isc_rwlocktype_read);
|
|
|
|
/*
|
|
* Search down from the root of the tree. If, while going down, we
|
|
* encounter a callback node, cache_zonecut_callback() will search the
|
|
* rdatasets at the zone cut for a DNAME rdataset.
|
|
*/
|
|
result = dns_rbt_findnode(search.rbtdb->tree, name, foundname, &node,
|
|
&search.chain, DNS_RBTFIND_EMPTYDATA,
|
|
cache_zonecut_callback, &search);
|
|
|
|
if (result == DNS_R_PARTIALMATCH) {
|
|
if ((search.options & DNS_DBFIND_COVERINGNSEC) != 0) {
|
|
result = find_coveringnsec(&search, nodep, now,
|
|
foundname, rdataset,
|
|
sigrdataset);
|
|
if (result == DNS_R_COVERINGNSEC)
|
|
goto tree_exit;
|
|
}
|
|
if (search.zonecut != NULL) {
|
|
result = setup_delegation(&search, nodep, foundname,
|
|
rdataset, sigrdataset);
|
|
goto tree_exit;
|
|
} else {
|
|
find_ns:
|
|
result = find_deepest_zonecut(&search, node, nodep,
|
|
foundname, rdataset,
|
|
sigrdataset);
|
|
goto tree_exit;
|
|
}
|
|
} else if (result != ISC_R_SUCCESS)
|
|
goto tree_exit;
|
|
|
|
/*
|
|
* Certain DNSSEC types are not subject to CNAME matching
|
|
* (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 = ISC_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;
|
|
nssig = NULL;
|
|
cnamesig = NULL;
|
|
empty_node = ISC_TRUE;
|
|
header_prev = NULL;
|
|
for (header = node->data; header != NULL; header = header_next) {
|
|
header_next = header->next;
|
|
if (header->ttl <= now) {
|
|
/*
|
|
* This rdataset is stale. If no one else is using the
|
|
* node, we can clean it up right now, otherwise we
|
|
* mark it as stale, and the node as dirty, so it will
|
|
* get cleaned up later.
|
|
*/
|
|
if ((header->ttl <= now - RBTDB_VIRTUAL) &&
|
|
(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;
|
|
|
|
if (dns_rbtnode_refcurrent(node) == 0) {
|
|
isc_mem_t *mctx;
|
|
|
|
mctx = search.rbtdb->common.mctx;
|
|
clean_stale_headers(mctx, header);
|
|
if (header_prev != NULL)
|
|
header_prev->next =
|
|
header->next;
|
|
else
|
|
node->data = header->next;
|
|
free_rdataset(mctx, header);
|
|
} else {
|
|
header->attributes |=
|
|
RDATASET_ATTR_STALE;
|
|
node->dirty = 1;
|
|
header_prev = header;
|
|
}
|
|
} else
|
|
header_prev = header;
|
|
} else if (EXISTS(header)) {
|
|
/*
|
|
* We now know that there is at least one active
|
|
* non-stale rdataset at this node.
|
|
*/
|
|
empty_node = ISC_FALSE;
|
|
|
|
/*
|
|
* If we found a type we were looking for, remember
|
|
* it.
|
|
*/
|
|
if (header->type == type ||
|
|
(type == dns_rdatatype_any &&
|
|
RBTDB_RDATATYPE_BASE(header->type) != 0) ||
|
|
(cname_ok && header->type ==
|
|
dns_rdatatype_cname)) {
|
|
/*
|
|
* We've found the answer.
|
|
*/
|
|
found = header;
|
|
if (header->type == dns_rdatatype_cname &&
|
|
cname_ok &&
|
|
cnamesig != NULL) {
|
|
/*
|
|
* If we've already got the CNAME RRSIG,
|
|
* use it, otherwise change sigtype
|
|
* so that we find it.
|
|
*/
|
|
if (cnamesig != NULL)
|
|
foundsig = cnamesig;
|
|
else
|
|
sigtype =
|
|
RBTDB_RDATATYPE_SIGCNAME;
|
|
foundsig = cnamesig;
|
|
}
|
|
} else if (header->type == sigtype) {
|
|
/*
|
|
* We've found the RRSIG rdataset for our
|
|
* target type. Remember it.
|
|
*/
|
|
foundsig = header;
|
|
} else if (header->type == RBTDB_RDATATYPE_NCACHEANY ||
|
|
header->type == 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 (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 ||
|
|
(found->trust == dns_trust_glue &&
|
|
((options & DNS_DBFIND_GLUEOK) == 0)) ||
|
|
(found->trust == dns_trust_pending &&
|
|
((options & DNS_DBFIND_PENDINGOK) == 0))) {
|
|
/*
|
|
* If there is an NS rdataset at this node, then this is the
|
|
* deepest zone cut.
|
|
*/
|
|
if (nsheader != NULL) {
|
|
if (nodep != NULL) {
|
|
new_reference(search.rbtdb, node);
|
|
*nodep = node;
|
|
}
|
|
bind_rdataset(search.rbtdb, node, nsheader, search.now,
|
|
rdataset);
|
|
if (nssig != NULL)
|
|
bind_rdataset(search.rbtdb, node, nssig,
|
|
search.now, sigrdataset);
|
|
result = DNS_R_DELEGATION;
|
|
goto node_exit;
|
|
}
|
|
|
|
/*
|
|
* Go find the deepest zone cut.
|
|
*/
|
|
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);
|
|
*nodep = node;
|
|
}
|
|
|
|
if (RBTDB_RDATATYPE_BASE(found->type) == 0) {
|
|
/*
|
|
* We found a negative cache entry.
|
|
*/
|
|
if (NXDOMAIN(found))
|
|
result = DNS_R_NCACHENXDOMAIN;
|
|
else
|
|
result = DNS_R_NCACHENXRRSET;
|
|
} else if (type != found->type &&
|
|
type != dns_rdatatype_any &&
|
|
found->type == dns_rdatatype_cname) {
|
|
/*
|
|
* We weren't doing an ANY query and we found a CNAME instead
|
|
* of the type we were looking for, so we need to indicate
|
|
* that result to the caller.
|
|
*/
|
|
result = DNS_R_CNAME;
|
|
} else {
|
|
/*
|
|
* An ordinary successful query!
|
|
*/
|
|
result = ISC_R_SUCCESS;
|
|
}
|
|
|
|
if (type != dns_rdatatype_any || result == DNS_R_NCACHENXDOMAIN ||
|
|
result == DNS_R_NCACHENXRRSET) {
|
|
bind_rdataset(search.rbtdb, node, found, search.now,
|
|
rdataset);
|
|
if (foundsig != NULL)
|
|
bind_rdataset(search.rbtdb, node, foundsig, search.now,
|
|
sigrdataset);
|
|
}
|
|
|
|
node_exit:
|
|
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;
|
|
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);
|
|
NODE_UNLOCK(lock, isc_rwlocktype_read);
|
|
}
|
|
|
|
dns_rbtnodechain_reset(&search.chain);
|
|
|
|
return (result);
|
|
}
|
|
|
|
static isc_result_t
|
|
cache_findzonecut(dns_db_t *db, dns_name_t *name, unsigned int options,
|
|
isc_stdtime_t now, dns_dbnode_t **nodep,
|
|
dns_name_t *foundname,
|
|
dns_rdataset_t *rdataset, dns_rdataset_t *sigrdataset)
|
|
{
|
|
dns_rbtnode_t *node = NULL;
|
|
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;
|
|
|
|
search.rbtdb = (dns_rbtdb_t *)db;
|
|
|
|
REQUIRE(VALID_RBTDB(search.rbtdb));
|
|
|
|
if (now == 0)
|
|
isc_stdtime_get(&now);
|
|
|
|
search.rbtversion = NULL;
|
|
search.serial = 1;
|
|
search.options = options;
|
|
search.copy_name = ISC_FALSE;
|
|
search.need_cleanup = ISC_FALSE;
|
|
search.wild = ISC_FALSE;
|
|
search.zonecut = NULL;
|
|
dns_fixedname_init(&search.zonecut_name);
|
|
dns_rbtnodechain_init(&search.chain, search.rbtdb->common.mctx);
|
|
search.now = now;
|
|
|
|
if ((options & DNS_DBFIND_NOEXACT) != 0)
|
|
rbtoptions |= DNS_RBTFIND_NOEXACT;
|
|
|
|
RWLOCK(&search.rbtdb->tree_lock, isc_rwlocktype_read);
|
|
|
|
/*
|
|
* Search down from the root of the tree.
|
|
*/
|
|
result = dns_rbt_findnode(search.rbtdb->tree, name, foundname, &node,
|
|
&search.chain, rbtoptions, NULL, &search);
|
|
|
|
if (result == DNS_R_PARTIALMATCH) {
|
|
find_ns:
|
|
result = find_deepest_zonecut(&search, node, nodep, foundname,
|
|
rdataset, sigrdataset);
|
|
goto tree_exit;
|
|
} else if (result != ISC_R_SUCCESS)
|
|
goto tree_exit;
|
|
|
|
/*
|
|
* We now go looking for an NS rdataset at the node.
|
|
*/
|
|
|
|
lock = &(search.rbtdb->node_locks[node->locknum].lock);
|
|
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 (header->ttl <= now) {
|
|
/*
|
|
* This rdataset is stale. If no one else is using the
|
|
* node, we can clean it up right now, otherwise we
|
|
* mark it as stale, and the node as dirty, so it will
|
|
* get cleaned up later.
|
|
*/
|
|
if ((header->ttl <= now - RBTDB_VIRTUAL) &&
|
|
(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;
|
|
|
|
if (dns_rbtnode_refcurrent(node) == 0) {
|
|
isc_mem_t *mctx;
|
|
|
|
mctx = search.rbtdb->common.mctx;
|
|
clean_stale_headers(mctx, header);
|
|
if (header_prev != NULL)
|
|
header_prev->next =
|
|
header->next;
|
|
else
|
|
node->data = header->next;
|
|
free_rdataset(mctx, header);
|
|
} else {
|
|
header->attributes |=
|
|
RDATASET_ATTR_STALE;
|
|
node->dirty = 1;
|
|
header_prev = header;
|
|
}
|
|
} else
|
|
header_prev = header;
|
|
} else if (EXISTS(header)) {
|
|
/*
|
|
* If we found a type we were looking for, remember
|
|
* it.
|
|
*/
|
|
if (header->type == dns_rdatatype_ns) {
|
|
/*
|
|
* Remember a NS rdataset even if we're
|
|
* not specifically looking for it, because
|
|
* we might need it later.
|
|
*/
|
|
found = header;
|
|
} else if (header->type == RBTDB_RDATATYPE_SIGNS) {
|
|
/*
|
|
* If we need the NS rdataset, we'll also
|
|
* need its signature.
|
|
*/
|
|
foundsig = header;
|
|
}
|
|
header_prev = header;
|
|
} else
|
|
header_prev = header;
|
|
}
|
|
|
|
if (found == NULL) {
|
|
/*
|
|
* No NS records here.
|
|
*/
|
|
NODE_UNLOCK(lock, locktype);
|
|
goto find_ns;
|
|
}
|
|
|
|
if (nodep != NULL) {
|
|
new_reference(search.rbtdb, node);
|
|
*nodep = node;
|
|
}
|
|
|
|
bind_rdataset(search.rbtdb, node, found, search.now, rdataset);
|
|
if (foundsig != NULL)
|
|
bind_rdataset(search.rbtdb, node, foundsig, search.now,
|
|
sigrdataset);
|
|
|
|
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;
|
|
unsigned int refs;
|
|
|
|
REQUIRE(VALID_RBTDB(rbtdb));
|
|
REQUIRE(targetp != NULL && *targetp == NULL);
|
|
|
|
NODE_STRONGLOCK(&rbtdb->node_locks[node->locknum].lock);
|
|
dns_rbtnode_refincrement(node, &refs);
|
|
INSIST(refs != 0);
|
|
NODE_STRONGUNLOCK(&rbtdb->node_locks[node->locknum].lock);
|
|
|
|
*targetp = source;
|
|
}
|
|
|
|
static void
|
|
detachnode(dns_db_t *db, dns_dbnode_t **targetp) {
|
|
dns_rbtdb_t *rbtdb = (dns_rbtdb_t *)db;
|
|
dns_rbtnode_t *node;
|
|
isc_boolean_t want_free = ISC_FALSE;
|
|
isc_boolean_t inactive = ISC_FALSE;
|
|
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)) {
|
|
if (isc_refcount_current(&nodelock->references) == 0 &&
|
|
nodelock->exiting) {
|
|
inactive = ISC_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 = ISC_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
|
|
strcpy(buf, "<UNKNOWN>");
|
|
isc_log_write(dns_lctx, DNS_LOGCATEGORY_DATABASE,
|
|
DNS_LOGMODULE_CACHE, ISC_LOG_DEBUG(1),
|
|
"calling free_rbtdb(%s)", buf);
|
|
free_rbtdb(rbtdb, ISC_TRUE, NULL);
|
|
}
|
|
}
|
|
}
|
|
|
|
static isc_result_t
|
|
expirenode(dns_db_t *db, dns_dbnode_t *node, isc_stdtime_t now) {
|
|
dns_rbtdb_t *rbtdb = (dns_rbtdb_t *)db;
|
|
dns_rbtnode_t *rbtnode = node;
|
|
rdatasetheader_t *header;
|
|
isc_boolean_t force_expire = ISC_FALSE;
|
|
/*
|
|
* These are the category and module used by the cache cleaner.
|
|
*/
|
|
isc_boolean_t log = ISC_FALSE;
|
|
isc_logcategory_t *category = DNS_LOGCATEGORY_DATABASE;
|
|
isc_logmodule_t *module = DNS_LOGMODULE_CACHE;
|
|
int level = ISC_LOG_DEBUG(2);
|
|
char printname[DNS_NAME_FORMATSIZE];
|
|
|
|
REQUIRE(VALID_RBTDB(rbtdb));
|
|
|
|
/*
|
|
* Caller must hold a tree lock.
|
|
*/
|
|
|
|
if (now == 0)
|
|
isc_stdtime_get(&now);
|
|
|
|
if (rbtdb->overmem) {
|
|
isc_uint32_t val;
|
|
|
|
isc_random_get(&val);
|
|
/*
|
|
* XXXDCL Could stand to have a better policy, like LRU.
|
|
*/
|
|
force_expire = ISC_TF(rbtnode->down == NULL && val % 4 == 0);
|
|
|
|
/*
|
|
* Note that 'log' can be true IFF rbtdb->overmem is also true.
|
|
* rbtdb->ovemem can currently only be true for cache databases
|
|
* -- hence all of the "overmem cache" log strings.
|
|
*/
|
|
log = ISC_TF(isc_log_wouldlog(dns_lctx, level));
|
|
if (log)
|
|
isc_log_write(dns_lctx, category, module, level,
|
|
"overmem cache: %s %s",
|
|
force_expire ? "FORCE" : "check",
|
|
dns_rbt_formatnodename(rbtnode,
|
|
printname,
|
|
sizeof(printname)));
|
|
}
|
|
|
|
/*
|
|
* 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->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.
|
|
*/
|
|
header->attributes |= RDATASET_ATTR_STALE;
|
|
rbtnode->dirty = 1;
|
|
if (log)
|
|
isc_log_write(dns_lctx, category, module,
|
|
level, "overmem cache: stale %s",
|
|
printname);
|
|
} else if (force_expire) {
|
|
if (! RETAIN(header)) {
|
|
header->ttl = 0;
|
|
header->attributes |= RDATASET_ATTR_STALE;
|
|
rbtnode->dirty = 1;
|
|
} else if (log) {
|
|
isc_log_write(dns_lctx, category, module,
|
|
level, "overmem cache: "
|
|
"reprieve by RETAIN() %s",
|
|
printname);
|
|
}
|
|
} else if (rbtdb->overmem && log)
|
|
isc_log_write(dns_lctx, category, module, level,
|
|
"overmem cache: saved %s", printname);
|
|
|
|
NODE_UNLOCK(&rbtdb->node_locks[rbtnode->locknum].lock,
|
|
isc_rwlocktype_write);
|
|
|
|
return (ISC_R_SUCCESS);
|
|
}
|
|
|
|
static void
|
|
overmem(dns_db_t *db, isc_boolean_t overmem) {
|
|
dns_rbtdb_t *rbtdb = (dns_rbtdb_t *)db;
|
|
|
|
if (IS_CACHE(rbtdb)) {
|
|
rbtdb->overmem = overmem;
|
|
}
|
|
}
|
|
|
|
static void
|
|
printnode(dns_db_t *db, dns_dbnode_t *node, FILE *out) {
|
|
dns_rbtdb_t *rbtdb = (dns_rbtdb_t *)db;
|
|
dns_rbtnode_t *rbtnode = node;
|
|
isc_boolean_t first;
|
|
|
|
REQUIRE(VALID_RBTDB(rbtdb));
|
|
|
|
NODE_LOCK(&rbtdb->node_locks[rbtnode->locknum].lock,
|
|
isc_rwlocktype_read);
|
|
|
|
fprintf(out, "node %p, %u references, locknum = %u\n",
|
|
rbtnode, dns_rbtnode_refcurrent(rbtnode),
|
|
rbtnode->locknum);
|
|
if (rbtnode->data != NULL) {
|
|
rdatasetheader_t *current, *top_next;
|
|
|
|
for (current = rbtnode->data; current != NULL;
|
|
current = top_next) {
|
|
top_next = current->next;
|
|
first = ISC_TRUE;
|
|
fprintf(out, "\ttype %u", current->type);
|
|
do {
|
|
if (!first)
|
|
fprintf(out, "\t");
|
|
first = ISC_FALSE;
|
|
fprintf(out,
|
|
"\tserial = %lu, ttl = %u, "
|
|
"trust = %u, attributes = %u\n",
|
|
(unsigned long)current->serial,
|
|
current->ttl,
|
|
current->trust,
|
|
current->attributes);
|
|
current = current->down;
|
|
} while (current != NULL);
|
|
}
|
|
} else
|
|
fprintf(out, "(empty)\n");
|
|
|
|
NODE_UNLOCK(&rbtdb->node_locks[rbtnode->locknum].lock,
|
|
isc_rwlocktype_read);
|
|
}
|
|
|
|
static isc_result_t
|
|
createiterator(dns_db_t *db, isc_boolean_t relative_names,
|
|
dns_dbiterator_t **iteratorp)
|
|
{
|
|
dns_rbtdb_t *rbtdb = (dns_rbtdb_t *)db;
|
|
rbtdb_dbiterator_t *rbtdbiter;
|
|
|
|
REQUIRE(VALID_RBTDB(rbtdb));
|
|
|
|
rbtdbiter = isc_mem_get(rbtdb->common.mctx, sizeof(*rbtdbiter));
|
|
if (rbtdbiter == NULL)
|
|
return (ISC_R_NOMEMORY);
|
|
|
|
rbtdbiter->common.methods = &dbiterator_methods;
|
|
rbtdbiter->common.db = NULL;
|
|
dns_db_attach(db, &rbtdbiter->common.db);
|
|
rbtdbiter->common.relative_names = relative_names;
|
|
rbtdbiter->common.magic = DNS_DBITERATOR_MAGIC;
|
|
rbtdbiter->common.cleaning = ISC_FALSE;
|
|
rbtdbiter->paused = ISC_TRUE;
|
|
rbtdbiter->tree_locked = isc_rwlocktype_none;
|
|
rbtdbiter->result = ISC_R_SUCCESS;
|
|
dns_fixedname_init(&rbtdbiter->name);
|
|
dns_fixedname_init(&rbtdbiter->origin);
|
|
rbtdbiter->node = NULL;
|
|
rbtdbiter->delete = 0;
|
|
memset(rbtdbiter->deletions, 0, sizeof(rbtdbiter->deletions));
|
|
dns_rbtnodechain_init(&rbtdbiter->chain, db->mctx);
|
|
|
|
*iteratorp = (dns_dbiterator_t *)rbtdbiter;
|
|
|
|
return (ISC_R_SUCCESS);
|
|
}
|
|
|
|
static isc_result_t
|
|
zone_findrdataset(dns_db_t *db, dns_dbnode_t *node, dns_dbversion_t *version,
|
|
dns_rdatatype_t type, dns_rdatatype_t covers,
|
|
isc_stdtime_t now, dns_rdataset_t *rdataset,
|
|
dns_rdataset_t *sigrdataset)
|
|
{
|
|
dns_rbtdb_t *rbtdb = (dns_rbtdb_t *)db;
|
|
dns_rbtnode_t *rbtnode = (dns_rbtnode_t *)node;
|
|
rdatasetheader_t *header, *header_next, *found, *foundsig;
|
|
rbtdb_serial_t serial;
|
|
rbtdb_version_t *rbtversion = version;
|
|
isc_boolean_t close_version = ISC_FALSE;
|
|
rbtdb_rdatatype_t matchtype, sigmatchtype;
|
|
|
|
REQUIRE(VALID_RBTDB(rbtdb));
|
|
REQUIRE(type != dns_rdatatype_any);
|
|
|
|
if (rbtversion == NULL) {
|
|
currentversion(db, (dns_dbversion_t **) (void *)(&rbtversion));
|
|
close_version = ISC_TRUE;
|
|
}
|
|
serial = rbtversion->serial;
|
|
now = 0;
|
|
|
|
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, rdataset);
|
|
if (foundsig != NULL)
|
|
bind_rdataset(rbtdb, rbtnode, foundsig, now,
|
|
sigrdataset);
|
|
}
|
|
|
|
NODE_UNLOCK(&rbtdb->node_locks[rbtnode->locknum].lock,
|
|
isc_rwlocktype_read);
|
|
|
|
if (close_version)
|
|
closeversion(db, (dns_dbversion_t **) (void *)(&rbtversion),
|
|
ISC_FALSE);
|
|
|
|
if (found == NULL)
|
|
return (ISC_R_NOTFOUND);
|
|
|
|
return (ISC_R_SUCCESS);
|
|
}
|
|
|
|
static isc_result_t
|
|
cache_findrdataset(dns_db_t *db, dns_dbnode_t *node, dns_dbversion_t *version,
|
|
dns_rdatatype_t type, dns_rdatatype_t covers,
|
|
isc_stdtime_t now, dns_rdataset_t *rdataset,
|
|
dns_rdataset_t *sigrdataset)
|
|
{
|
|
dns_rbtdb_t *rbtdb = (dns_rbtdb_t *)db;
|
|
dns_rbtnode_t *rbtnode = (dns_rbtnode_t *)node;
|
|
rdatasetheader_t *header, *header_next, *found, *foundsig;
|
|
rbtdb_rdatatype_t matchtype, sigmatchtype, 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 (header->ttl <= now) {
|
|
if ((header->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.
|
|
*/
|
|
header->attributes |= RDATASET_ATTR_STALE;
|
|
rbtnode->dirty = 1;
|
|
}
|
|
} else if (EXISTS(header)) {
|
|
if (header->type == matchtype)
|
|
found = header;
|
|
else if (header->type == RBTDB_RDATATYPE_NCACHEANY ||
|
|
header->type == negtype)
|
|
found = header;
|
|
else if (header->type == sigmatchtype)
|
|
foundsig = header;
|
|
}
|
|
}
|
|
if (found != NULL) {
|
|
bind_rdataset(rbtdb, rbtnode, found, now, rdataset);
|
|
if (foundsig != NULL)
|
|
bind_rdataset(rbtdb, rbtnode, foundsig, now,
|
|
sigrdataset);
|
|
}
|
|
|
|
NODE_UNLOCK(lock, locktype);
|
|
|
|
if (found == NULL)
|
|
return (ISC_R_NOTFOUND);
|
|
|
|
if (RBTDB_RDATATYPE_BASE(found->type) == 0) {
|
|
/*
|
|
* We found a negative cache entry.
|
|
*/
|
|
if (NXDOMAIN(found))
|
|
result = DNS_R_NCACHENXDOMAIN;
|
|
else
|
|
result = DNS_R_NCACHENXRRSET;
|
|
}
|
|
|
|
return (result);
|
|
}
|
|
|
|
static isc_result_t
|
|
allrdatasets(dns_db_t *db, dns_dbnode_t *node, dns_dbversion_t *version,
|
|
isc_stdtime_t now, dns_rdatasetiter_t **iteratorp)
|
|
{
|
|
dns_rbtdb_t *rbtdb = (dns_rbtdb_t *)db;
|
|
dns_rbtnode_t *rbtnode = (dns_rbtnode_t *)node;
|
|
rbtdb_version_t *rbtversion = version;
|
|
rbtdb_rdatasetiter_t *iterator;
|
|
unsigned int refs;
|
|
|
|
REQUIRE(VALID_RBTDB(rbtdb));
|
|
|
|
iterator = isc_mem_get(rbtdb->common.mctx, sizeof(*iterator));
|
|
if (iterator == NULL)
|
|
return (ISC_R_NOMEMORY);
|
|
|
|
if ((db->attributes & DNS_DBATTR_CACHE) == 0) {
|
|
now = 0;
|
|
if (rbtversion == NULL)
|
|
currentversion(db,
|
|
(dns_dbversion_t **) (void *)(&rbtversion));
|
|
else {
|
|
unsigned int refs;
|
|
|
|
isc_refcount_increment(&rbtversion->references,
|
|
&refs);
|
|
INSIST(refs > 1);
|
|
}
|
|
} else {
|
|
if (now == 0)
|
|
isc_stdtime_get(&now);
|
|
rbtversion = NULL;
|
|
}
|
|
|
|
iterator->common.magic = DNS_RDATASETITER_MAGIC;
|
|
iterator->common.methods = &rdatasetiter_methods;
|
|
iterator->common.db = db;
|
|
iterator->common.node = node;
|
|
iterator->common.version = (dns_dbversion_t *)rbtversion;
|
|
iterator->common.now = now;
|
|
|
|
NODE_STRONGLOCK(&rbtdb->node_locks[rbtnode->locknum].lock);
|
|
|
|
dns_rbtnode_refincrement(rbtnode, &refs);
|
|
INSIST(refs != 0);
|
|
|
|
iterator->current = NULL;
|
|
|
|
NODE_STRONGUNLOCK(&rbtdb->node_locks[rbtnode->locknum].lock);
|
|
|
|
*iteratorp = (dns_rdatasetiter_t *)iterator;
|
|
|
|
return (ISC_R_SUCCESS);
|
|
}
|
|
|
|
static isc_boolean_t
|
|
cname_and_other_data(dns_rbtnode_t *node, rbtdb_serial_t serial) {
|
|
rdatasetheader_t *header, *header_next;
|
|
isc_boolean_t cname, other_data;
|
|
dns_rdatatype_t rdtype;
|
|
|
|
/*
|
|
* The caller must hold the node lock.
|
|
*/
|
|
|
|
/*
|
|
* Look for CNAME and "other data" rdatasets active in our version.
|
|
*/
|
|
cname = ISC_FALSE;
|
|
other_data = ISC_FALSE;
|
|
for (header = node->data; header != NULL; header = header_next) {
|
|
header_next = header->next;
|
|
if (header->type == dns_rdatatype_cname) {
|
|
/*
|
|
* Look for an active extant CNAME.
|
|
*/
|
|
do {
|
|
if (header->serial <= serial &&
|
|
!IGNORE(header)) {
|
|
/*
|
|
* Is this a "this rdataset doesn't
|
|
* exist" record?
|
|
*/
|
|
if (NONEXISTENT(header))
|
|
header = NULL;
|
|
break;
|
|
} else
|
|
header = header->down;
|
|
} while (header != NULL);
|
|
if (header != NULL)
|
|
cname = ISC_TRUE;
|
|
} else {
|
|
/*
|
|
* Look for active extant "other data".
|
|
*
|
|
* "Other data" is any rdataset whose type is not
|
|
* KEY, RRSIG KEY, NSEC, RRSIG NSEC or RRSIG CNAME.
|
|
*/
|
|
rdtype = RBTDB_RDATATYPE_BASE(header->type);
|
|
if (rdtype == dns_rdatatype_rrsig ||
|
|
rdtype == dns_rdatatype_sig)
|
|
rdtype = RBTDB_RDATATYPE_EXT(header->type);
|
|
if (rdtype != dns_rdatatype_nsec &&
|
|
rdtype != dns_rdatatype_key &&
|
|
rdtype != dns_rdatatype_cname) {
|
|
/*
|
|
* We've found a type that isn't
|
|
* NSEC, KEY, CNAME, or one of their
|
|
* signatures. Is it active and extant?
|
|
*/
|
|
do {
|
|
if (header->serial <= serial &&
|
|
!IGNORE(header)) {
|
|
/*
|
|
* Is this a "this rdataset
|
|
* doesn't exist" record?
|
|
*/
|
|
if (NONEXISTENT(header))
|
|
header = NULL;
|
|
break;
|
|
} else
|
|
header = header->down;
|
|
} while (header != NULL);
|
|
if (header != NULL)
|
|
other_data = ISC_TRUE;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (cname && other_data)
|
|
return (ISC_TRUE);
|
|
|
|
return (ISC_FALSE);
|
|
}
|
|
|
|
static isc_result_t
|
|
add(dns_rbtdb_t *rbtdb, dns_rbtnode_t *rbtnode, rbtdb_version_t *rbtversion,
|
|
rdatasetheader_t *newheader, unsigned int options, isc_boolean_t loading,
|
|
dns_rdataset_t *addedrdataset, isc_stdtime_t now)
|
|
{
|
|
rbtdb_changed_t *changed = NULL;
|
|
rdatasetheader_t *topheader, *topheader_prev, *header;
|
|
unsigned char *merged;
|
|
isc_result_t result;
|
|
isc_boolean_t header_nx;
|
|
isc_boolean_t newheader_nx;
|
|
isc_boolean_t merge;
|
|
dns_rdatatype_t rdtype, covers;
|
|
rbtdb_rdatatype_t negtype;
|
|
dns_trust_t trust;
|
|
|
|
/*
|
|
* Add an rdatasetheader_t to a node.
|
|
*/
|
|
|
|
/*
|
|
* Caller must be holding the node lock.
|
|
*/
|
|
|
|
if ((options & DNS_DBADD_MERGE) != 0) {
|
|
REQUIRE(rbtversion != NULL);
|
|
merge = ISC_TRUE;
|
|
} else
|
|
merge = ISC_FALSE;
|
|
|
|
if ((options & DNS_DBADD_FORCE) != 0)
|
|
trust = dns_trust_ultimate;
|
|
else
|
|
trust = newheader->trust;
|
|
|
|
if (rbtversion != NULL && !loading) {
|
|
/*
|
|
* We always add a changed record, even if no changes end up
|
|
* being made to this node, because it's harmless and
|
|
* simplifies the code.
|
|
*/
|
|
changed = add_changed(rbtdb, rbtversion, rbtnode);
|
|
if (changed == NULL) {
|
|
free_rdataset(rbtdb->common.mctx, newheader);
|
|
return (ISC_R_NOMEMORY);
|
|
}
|
|
}
|
|
|
|
newheader_nx = NONEXISTENT(newheader) ? ISC_TRUE : ISC_FALSE;
|
|
topheader_prev = NULL;
|
|
|
|
negtype = 0;
|
|
if (rbtversion == NULL && !newheader_nx) {
|
|
rdtype = RBTDB_RDATATYPE_BASE(newheader->type);
|
|
if (rdtype == 0) {
|
|
/*
|
|
* We're adding a negative cache entry.
|
|
*/
|
|
covers = RBTDB_RDATATYPE_EXT(newheader->type);
|
|
if (covers == dns_rdatatype_any) {
|
|
/*
|
|
* We're adding an negative cache entry
|
|
* which covers all types (NXDOMAIN,
|
|
* NODATA(QTYPE=ANY)).
|
|
*
|
|
* We make all other data stale 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) {
|
|
topheader->ttl = 0;
|
|
topheader->attributes |=
|
|
RDATASET_ATTR_STALE;
|
|
}
|
|
rbtnode->dirty = 1;
|
|
goto find_header;
|
|
}
|
|
negtype = RBTDB_RDATATYPE_VALUE(covers, 0);
|
|
} else {
|
|
/*
|
|
* We're adding something that isn't a
|
|
* negative cache entry. Look for an extant
|
|
* non-stale NXDOMAIN/NODATA(QTYPE=ANY) negative
|
|
* cache entry.
|
|
*/
|
|
for (topheader = rbtnode->data;
|
|
topheader != NULL;
|
|
topheader = topheader->next) {
|
|
if (topheader->type ==
|
|
RBTDB_RDATATYPE_NCACHEANY)
|
|
break;
|
|
}
|
|
if (topheader != NULL && EXISTS(topheader) &&
|
|
topheader->ttl > now) {
|
|
/*
|
|
* Found one.
|
|
*/
|
|
if (trust < topheader->trust) {
|
|
/*
|
|
* The NXDOMAIN/NODATA(QTYPE=ANY)
|
|
* is more trusted.
|
|
*/
|
|
|
|
free_rdataset(rbtdb->common.mctx,
|
|
newheader);
|
|
if (addedrdataset != NULL)
|
|
bind_rdataset(rbtdb, rbtnode,
|
|
topheader, now,
|
|
addedrdataset);
|
|
return (DNS_R_UNCHANGED);
|
|
}
|
|
/*
|
|
* The new rdataset is better. Expire the
|
|
* NXDOMAIN/NODATA(QTYPE=ANY).
|
|
*/
|
|
topheader->ttl = 0;
|
|
topheader->attributes |= RDATASET_ATTR_STALE;
|
|
rbtnode->dirty = 1;
|
|
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) ? ISC_TRUE : ISC_FALSE;
|
|
|
|
/*
|
|
* Deleting an already non-existent rdataset has no effect.
|
|
*/
|
|
if (header_nx && newheader_nx) {
|
|
free_rdataset(rbtdb->common.mctx, newheader);
|
|
return (DNS_R_UNCHANGED);
|
|
}
|
|
|
|
/*
|
|
* Trying to add an rdataset with lower trust to a cache DB
|
|
* has no effect, provided that the cache data isn't stale.
|
|
*/
|
|
if (rbtversion == NULL && trust < header->trust &&
|
|
(header->ttl > now || header_nx)) {
|
|
free_rdataset(rbtdb->common.mctx, newheader);
|
|
if (addedrdataset != NULL)
|
|
bind_rdataset(rbtdb, rbtnode, header, now,
|
|
addedrdataset);
|
|
return (DNS_R_UNCHANGED);
|
|
}
|
|
|
|
/*
|
|
* Don't merge if a nonexistent rdataset is involved.
|
|
*/
|
|
if (merge && (header_nx || newheader_nx))
|
|
merge = ISC_FALSE;
|
|
|
|
/*
|
|
* If 'merge' is ISC_TRUE, we'll try to create a new rdataset
|
|
* that is the union of 'newheader' and 'header'.
|
|
*/
|
|
if (merge) {
|
|
unsigned int flags = 0;
|
|
INSIST(rbtversion->serial >= header->serial);
|
|
merged = NULL;
|
|
result = ISC_R_SUCCESS;
|
|
|
|
if ((options & DNS_DBADD_EXACT) != 0)
|
|
flags |= DNS_RDATASLAB_EXACT;
|
|
if ((options & DNS_DBADD_EXACTTTL) != 0 &&
|
|
newheader->ttl != header->ttl)
|
|
result = DNS_R_NOTEXACT;
|
|
else if (newheader->ttl != header->ttl)
|
|
flags |= DNS_RDATASLAB_FORCE;
|
|
if (result == ISC_R_SUCCESS)
|
|
result = dns_rdataslab_merge(
|
|
(unsigned char *)header,
|
|
(unsigned char *)newheader,
|
|
(unsigned int)(sizeof(*newheader)),
|
|
rbtdb->common.mctx,
|
|
rbtdb->common.rdclass,
|
|
(dns_rdatatype_t)header->type,
|
|
flags, &merged);
|
|
if (result == ISC_R_SUCCESS) {
|
|
/*
|
|
* If 'header' has the same serial number as
|
|
* we do, we could clean it up now if we knew
|
|
* that our caller had no references to it.
|
|
* We don't know this, however, so we leave it
|
|
* alone. It will get cleaned up when
|
|
* clean_zone_node() runs.
|
|
*/
|
|
free_rdataset(rbtdb->common.mctx, newheader);
|
|
newheader = (rdatasetheader_t *)merged;
|
|
} else {
|
|
free_rdataset(rbtdb->common.mctx, newheader);
|
|
return (result);
|
|
}
|
|
}
|
|
/*
|
|
* Don't replace existing NS, A and AAAA RRsets
|
|
* in the cache if they are already exist. This
|
|
* prevents named being locked to old servers.
|
|
* Don't lower trust of existing record if the
|
|
* update is forced.
|
|
*/
|
|
if (IS_CACHE(rbtdb) && header->ttl > now &&
|
|
header->type == dns_rdatatype_ns &&
|
|
!header_nx && !newheader_nx &&
|
|
header->trust >= newheader->trust &&
|
|
dns_rdataslab_equalx((unsigned char *)header,
|
|
(unsigned char *)newheader,
|
|
(unsigned int)(sizeof(*newheader)),
|
|
rbtdb->common.rdclass,
|
|
(dns_rdatatype_t)header->type)) {
|
|
/*
|
|
* Honour the new ttl if it is less than the
|
|
* older one.
|
|
*/
|
|
if (header->ttl > newheader->ttl)
|
|
header->ttl = newheader->ttl;
|
|
if (header->noqname == NULL &&
|
|
newheader->noqname != NULL) {
|
|
header->noqname = newheader->noqname;
|
|
newheader->noqname = NULL;
|
|
}
|
|
free_rdataset(rbtdb->common.mctx, newheader);
|
|
if (addedrdataset != NULL)
|
|
bind_rdataset(rbtdb, rbtnode, header, now,
|
|
addedrdataset);
|
|
return (ISC_R_SUCCESS);
|
|
}
|
|
if (IS_CACHE(rbtdb) && header->ttl > now &&
|
|
(header->type == dns_rdatatype_a ||
|
|
header->type == dns_rdatatype_aaaa) &&
|
|
!header_nx && !newheader_nx &&
|
|
header->trust >= newheader->trust &&
|
|
dns_rdataslab_equal((unsigned char *)header,
|
|
(unsigned char *)newheader,
|
|
(unsigned int)(sizeof(*newheader)))) {
|
|
/*
|
|
* Honour the new ttl if it is less than the
|
|
* older one.
|
|
*/
|
|
if (header->ttl > newheader->ttl)
|
|
header->ttl = newheader->ttl;
|
|
if (header->noqname == NULL &&
|
|
newheader->noqname != NULL) {
|
|
header->noqname = newheader->noqname;
|
|
newheader->noqname = NULL;
|
|
}
|
|
free_rdataset(rbtdb->common.mctx, newheader);
|
|
if (addedrdataset != NULL)
|
|
bind_rdataset(rbtdb, rbtnode, header, now,
|
|
addedrdataset);
|
|
return (ISC_R_SUCCESS);
|
|
}
|
|
INSIST(rbtversion == NULL ||
|
|
rbtversion->serial >= topheader->serial);
|
|
if (topheader_prev != NULL)
|
|
topheader_prev->next = newheader;
|
|
else
|
|
rbtnode->data = newheader;
|
|
newheader->next = topheader->next;
|
|
if (loading) {
|
|
/*
|
|
* There are no other references to 'header' when
|
|
* loading, so we MAY clean up 'header' now.
|
|
* Since we don't generate changed records when
|
|
* loading, we MUST clean up 'header' now.
|
|
*/
|
|
newheader->down = NULL;
|
|
free_rdataset(rbtdb->common.mctx, header);
|
|
} else {
|
|
newheader->down = topheader;
|
|
topheader->next = newheader;
|
|
rbtnode->dirty = 1;
|
|
if (changed != NULL)
|
|
changed->dirty = ISC_TRUE;
|
|
if (rbtversion == NULL) {
|
|
header->ttl = 0;
|
|
header->attributes |= RDATASET_ATTR_STALE;
|
|
}
|
|
}
|
|
} else {
|
|
/*
|
|
* No non-IGNORED rdatasets of the given type exist at
|
|
* this node.
|
|
*/
|
|
|
|
/*
|
|
* If we're trying to delete the type, don't bother.
|
|
*/
|
|
if (newheader_nx) {
|
|
free_rdataset(rbtdb->common.mctx, newheader);
|
|
return (DNS_R_UNCHANGED);
|
|
}
|
|
|
|
if (topheader != NULL) {
|
|
/*
|
|
* We have an list of rdatasets of the given type,
|
|
* but they're all marked IGNORE. We simply insert
|
|
* the new rdataset at the head of the list.
|
|
*
|
|
* Ignored rdatasets cannot occur during loading, so
|
|
* we INSIST on it.
|
|
*/
|
|
INSIST(!loading);
|
|
INSIST(rbtversion == NULL ||
|
|
rbtversion->serial >= topheader->serial);
|
|
if (topheader_prev != NULL)
|
|
topheader_prev->next = newheader;
|
|
else
|
|
rbtnode->data = newheader;
|
|
newheader->next = topheader->next;
|
|
newheader->down = topheader;
|
|
topheader->next = newheader;
|
|
rbtnode->dirty = 1;
|
|
if (changed != NULL)
|
|
changed->dirty = ISC_TRUE;
|
|
} else {
|
|
/*
|
|
* No rdatasets of the given type exist at the node.
|
|
*/
|
|
newheader->next = rbtnode->data;
|
|
newheader->down = NULL;
|
|
rbtnode->data = newheader;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Check if the node now contains CNAME and other data.
|
|
*/
|
|
if (rbtversion != NULL &&
|
|
cname_and_other_data(rbtnode, rbtversion->serial))
|
|
return (DNS_R_CNAMEANDOTHER);
|
|
|
|
if (addedrdataset != NULL)
|
|
bind_rdataset(rbtdb, rbtnode, newheader, now, addedrdataset);
|
|
|
|
return (ISC_R_SUCCESS);
|
|
}
|
|
|
|
static inline isc_boolean_t
|
|
delegating_type(dns_rbtdb_t *rbtdb, dns_rbtnode_t *node,
|
|
rbtdb_rdatatype_t type)
|
|
{
|
|
if (IS_CACHE(rbtdb)) {
|
|
if (type == dns_rdatatype_dname)
|
|
return (ISC_TRUE);
|
|
else
|
|
return (ISC_FALSE);
|
|
} else if (type == dns_rdatatype_dname ||
|
|
(type == dns_rdatatype_ns &&
|
|
(node != rbtdb->origin_node || IS_STUB(rbtdb))))
|
|
return (ISC_TRUE);
|
|
return (ISC_FALSE);
|
|
}
|
|
|
|
static inline isc_result_t
|
|
addnoqname(dns_rbtdb_t *rbtdb, rdatasetheader_t *newheader,
|
|
dns_rdataset_t *rdataset)
|
|
{
|
|
struct noqname *noqname;
|
|
isc_mem_t *mctx = rbtdb->common.mctx;
|
|
dns_name_t name;
|
|
dns_rdataset_t nsec, nsecsig;
|
|
isc_result_t result;
|
|
isc_region_t r;
|
|
|
|
dns_name_init(&name, NULL);
|
|
dns_rdataset_init(&nsec);
|
|
dns_rdataset_init(&nsecsig);
|
|
|
|
result = dns_rdataset_getnoqname(rdataset, &name, &nsec, &nsecsig);
|
|
RUNTIME_CHECK(result == ISC_R_SUCCESS);
|
|
|
|
noqname = isc_mem_get(mctx, sizeof(*noqname));
|
|
if (noqname == NULL) {
|
|
result = ISC_R_NOMEMORY;
|
|
goto cleanup;
|
|
}
|
|
dns_name_init(&noqname->name, NULL);
|
|
noqname->nsec = NULL;
|
|
noqname->nsecsig = NULL;
|
|
result = dns_name_dup(&name, mctx, &noqname->name);
|
|
if (result != ISC_R_SUCCESS)
|
|
goto cleanup;
|
|
result = dns_rdataslab_fromrdataset(&nsec, mctx, &r, 0);
|
|
if (result != ISC_R_SUCCESS)
|
|
goto cleanup;
|
|
noqname->nsec = r.base;
|
|
result = dns_rdataslab_fromrdataset(&nsecsig, mctx, &r, 0);
|
|
if (result != ISC_R_SUCCESS)
|
|
goto cleanup;
|
|
noqname->nsecsig = r.base;
|
|
dns_rdataset_disassociate(&nsec);
|
|
dns_rdataset_disassociate(&nsecsig);
|
|
newheader->noqname = noqname;
|
|
return (ISC_R_SUCCESS);
|
|
|
|
cleanup:
|
|
dns_rdataset_disassociate(&nsec);
|
|
dns_rdataset_disassociate(&nsecsig);
|
|
free_noqname(mctx, &noqname);
|
|
return(result);
|
|
}
|
|
|
|
static isc_result_t
|
|
addrdataset(dns_db_t *db, dns_dbnode_t *node, dns_dbversion_t *version,
|
|
isc_stdtime_t now, dns_rdataset_t *rdataset, unsigned int options,
|
|
dns_rdataset_t *addedrdataset)
|
|
{
|
|
dns_rbtdb_t *rbtdb = (dns_rbtdb_t *)db;
|
|
dns_rbtnode_t *rbtnode = (dns_rbtnode_t *)node;
|
|
rbtdb_version_t *rbtversion = version;
|
|
isc_region_t region;
|
|
rdatasetheader_t *newheader;
|
|
isc_result_t result;
|
|
isc_boolean_t delegating;
|
|
|
|
REQUIRE(VALID_RBTDB(rbtdb));
|
|
|
|
if (rbtversion == NULL) {
|
|
if (now == 0)
|
|
isc_stdtime_get(&now);
|
|
} else
|
|
now = 0;
|
|
|
|
result = dns_rdataslab_fromrdataset(rdataset, rbtdb->common.mctx,
|
|
®ion,
|
|
sizeof(rdatasetheader_t));
|
|
if (result != ISC_R_SUCCESS)
|
|
return (result);
|
|
|
|
newheader = (rdatasetheader_t *)region.base;
|
|
newheader->ttl = rdataset->ttl + now;
|
|
newheader->type = RBTDB_RDATATYPE_VALUE(rdataset->type,
|
|
rdataset->covers);
|
|
newheader->attributes = 0;
|
|
newheader->noqname = NULL;
|
|
newheader->count = init_count++;
|
|
newheader->trust = rdataset->trust;
|
|
newheader->additional_auth = NULL;
|
|
newheader->additional_glue = NULL;
|
|
if (rbtversion != NULL) {
|
|
newheader->serial = rbtversion->serial;
|
|
now = 0;
|
|
} else {
|
|
newheader->serial = 1;
|
|
if ((rdataset->attributes & DNS_RDATASETATTR_NXDOMAIN) != 0)
|
|
newheader->attributes |= RDATASET_ATTR_NXDOMAIN;
|
|
if ((rdataset->attributes & DNS_RDATASETATTR_NOQNAME) != 0) {
|
|
result = addnoqname(rbtdb, newheader, rdataset);
|
|
if (result != ISC_R_SUCCESS) {
|
|
free_rdataset(rbtdb->common.mctx, newheader);
|
|
return (result);
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* If we're adding a delegation type (e.g. NS or DNAME for a zone,
|
|
* just DNAME for the cache), then we need to set the callback bit
|
|
* on the node, and to do that we must be holding an exclusive lock
|
|
* on the tree.
|
|
*/
|
|
if (delegating_type(rbtdb, rbtnode, rdataset->type)) {
|
|
delegating = ISC_TRUE;
|
|
RWLOCK(&rbtdb->tree_lock, isc_rwlocktype_write);
|
|
} else
|
|
delegating = ISC_FALSE;
|
|
|
|
NODE_LOCK(&rbtdb->node_locks[rbtnode->locknum].lock,
|
|
isc_rwlocktype_write);
|
|
|
|
result = add(rbtdb, rbtnode, rbtversion, newheader, options, ISC_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 (delegating)
|
|
RWUNLOCK(&rbtdb->tree_lock, isc_rwlocktype_write);
|
|
|
|
/*
|
|
* Update the zone's secure status. If version is non-NULL
|
|
* this is defered until closeversion() is called.
|
|
*/
|
|
if (result == ISC_R_SUCCESS && version == NULL && !IS_CACHE(rbtdb))
|
|
rbtdb->secure = iszonesecure(db, 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;
|
|
rdatasetheader_t *topheader, *topheader_prev, *header, *newheader;
|
|
unsigned char *subresult;
|
|
isc_region_t region;
|
|
isc_result_t result;
|
|
rbtdb_changed_t *changed;
|
|
|
|
REQUIRE(VALID_RBTDB(rbtdb));
|
|
|
|
result = dns_rdataslab_fromrdataset(rdataset, rbtdb->common.mctx,
|
|
®ion,
|
|
sizeof(rdatasetheader_t));
|
|
if (result != ISC_R_SUCCESS)
|
|
return (result);
|
|
newheader = (rdatasetheader_t *)region.base;
|
|
newheader->ttl = rdataset->ttl;
|
|
newheader->type = RBTDB_RDATATYPE_VALUE(rdataset->type,
|
|
rdataset->covers);
|
|
newheader->attributes = 0;
|
|
newheader->serial = rbtversion->serial;
|
|
newheader->trust = 0;
|
|
newheader->noqname = NULL;
|
|
newheader->count = init_count++;
|
|
newheader->additional_auth = NULL;
|
|
newheader->additional_glue = NULL;
|
|
|
|
NODE_LOCK(&rbtdb->node_locks[rbtnode->locknum].lock,
|
|
isc_rwlocktype_write);
|
|
|
|
changed = add_changed(rbtdb, rbtversion, rbtnode);
|
|
if (changed == NULL) {
|
|
free_rdataset(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->ttl != header->ttl)
|
|
result = DNS_R_NOTEXACT;
|
|
}
|
|
if (result == ISC_R_SUCCESS)
|
|
result = dns_rdataslab_subtract(
|
|
(unsigned char *)header,
|
|
(unsigned char *)newheader,
|
|
(unsigned int)(sizeof(*newheader)),
|
|
rbtdb->common.mctx,
|
|
rbtdb->common.rdclass,
|
|
(dns_rdatatype_t)header->type,
|
|
flags, &subresult);
|
|
if (result == ISC_R_SUCCESS) {
|
|
free_rdataset(rbtdb->common.mctx, newheader);
|
|
newheader = (rdatasetheader_t *)subresult;
|
|
/*
|
|
* We have to set the serial since the rdataslab
|
|
* subtraction routine copies the reserved portion of
|
|
* header, not newheader.
|
|
*/
|
|
newheader->serial = rbtversion->serial;
|
|
/*
|
|
* XXXJT: dns_rdataslab_subtract() copied the pointers
|
|
* to additional info. We need to clear these fields
|
|
* to avoid having duplicated references.
|
|
*/
|
|
newheader->additional_auth = NULL;
|
|
newheader->additional_glue = NULL;
|
|
} else if (result == DNS_R_NXRRSET) {
|
|
/*
|
|
* This subtraction would remove all of the rdata;
|
|
* add a nonexistent header instead.
|
|
*/
|
|
free_rdataset(rbtdb->common.mctx, newheader);
|
|
newheader = isc_mem_get(rbtdb->common.mctx,
|
|
sizeof(*newheader));
|
|
if (newheader == NULL) {
|
|
result = ISC_R_NOMEMORY;
|
|
goto unlock;
|
|
}
|
|
newheader->ttl = 0;
|
|
newheader->type = topheader->type;
|
|
newheader->attributes = RDATASET_ATTR_NONEXISTENT;
|
|
newheader->trust = 0;
|
|
newheader->serial = rbtversion->serial;
|
|
newheader->noqname = NULL;
|
|
newheader->count = 0;
|
|
newheader->additional_auth = NULL;
|
|
newheader->additional_glue = NULL;
|
|
} else {
|
|
free_rdataset(rbtdb->common.mctx, newheader);
|
|
goto unlock;
|
|
}
|
|
|
|
/*
|
|
* If we're here, we want to link newheader in front of
|
|
* topheader.
|
|
*/
|
|
INSIST(rbtversion->serial >= topheader->serial);
|
|
if (topheader_prev != NULL)
|
|
topheader_prev->next = newheader;
|
|
else
|
|
rbtnode->data = newheader;
|
|
newheader->next = topheader->next;
|
|
newheader->down = topheader;
|
|
topheader->next = newheader;
|
|
rbtnode->dirty = 1;
|
|
changed->dirty = ISC_TRUE;
|
|
} else {
|
|
/*
|
|
* The rdataset doesn't exist, so we don't need to do anything
|
|
* to satisfy the deletion request.
|
|
*/
|
|
free_rdataset(rbtdb->common.mctx, newheader);
|
|
if ((options & DNS_DBSUB_EXACT) != 0)
|
|
result = DNS_R_NOTEXACT;
|
|
else
|
|
result = DNS_R_UNCHANGED;
|
|
}
|
|
|
|
if (result == ISC_R_SUCCESS && newrdataset != NULL)
|
|
bind_rdataset(rbtdb, rbtnode, newheader, 0, newrdataset);
|
|
|
|
unlock:
|
|
NODE_UNLOCK(&rbtdb->node_locks[rbtnode->locknum].lock,
|
|
isc_rwlocktype_write);
|
|
|
|
/*
|
|
* Update the zone's secure status. If version is non-NULL
|
|
* this is defered until closeversion() is called.
|
|
*/
|
|
if (result == ISC_R_SUCCESS && version == NULL && !IS_CACHE(rbtdb))
|
|
rbtdb->secure = iszonesecure(db, 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;
|
|
isc_result_t result;
|
|
rdatasetheader_t *newheader;
|
|
|
|
REQUIRE(VALID_RBTDB(rbtdb));
|
|
|
|
if (type == dns_rdatatype_any)
|
|
return (ISC_R_NOTIMPLEMENTED);
|
|
if (type == dns_rdatatype_rrsig && covers == 0)
|
|
return (ISC_R_NOTIMPLEMENTED);
|
|
|
|
newheader = isc_mem_get(rbtdb->common.mctx, sizeof(*newheader));
|
|
if (newheader == NULL)
|
|
return (ISC_R_NOMEMORY);
|
|
newheader->ttl = 0;
|
|
newheader->type = RBTDB_RDATATYPE_VALUE(type, covers);
|
|
newheader->attributes = RDATASET_ATTR_NONEXISTENT;
|
|
newheader->trust = 0;
|
|
newheader->noqname = NULL;
|
|
newheader->additional_auth = NULL;
|
|
newheader->additional_glue = NULL;
|
|
if (rbtversion != NULL)
|
|
newheader->serial = rbtversion->serial;
|
|
else
|
|
newheader->serial = 0;
|
|
newheader->count = 0;
|
|
|
|
NODE_LOCK(&rbtdb->node_locks[rbtnode->locknum].lock,
|
|
isc_rwlocktype_write);
|
|
|
|
result = add(rbtdb, rbtnode, rbtversion, newheader, DNS_DBADD_FORCE,
|
|
ISC_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 defered until closeversion() is called.
|
|
*/
|
|
if (result == ISC_R_SUCCESS && version == NULL && !IS_CACHE(rbtdb))
|
|
rbtdb->secure = iszonesecure(db, rbtdb->origin_node);
|
|
|
|
return (result);
|
|
}
|
|
|
|
static isc_result_t
|
|
loading_addrdataset(void *arg, dns_name_t *name, dns_rdataset_t *rdataset) {
|
|
rbtdb_load_t *loadctx = arg;
|
|
dns_rbtdb_t *rbtdb = loadctx->rbtdb;
|
|
dns_rbtnode_t *node;
|
|
isc_result_t result;
|
|
isc_region_t region;
|
|
rdatasetheader_t *newheader;
|
|
|
|
/*
|
|
* This routine does no node locking. See comments in
|
|
* 'load' below for more information on loading and
|
|
* locking.
|
|
*/
|
|
|
|
|
|
/*
|
|
* SOA records are only allowed at top of zone.
|
|
*/
|
|
if (rdataset->type == dns_rdatatype_soa &&
|
|
!IS_CACHE(rbtdb) && !dns_name_equal(name, &rbtdb->common.origin))
|
|
return (DNS_R_NOTZONETOP);
|
|
|
|
add_empty_wildcards(rbtdb, name);
|
|
|
|
if (dns_name_iswildcard(name)) {
|
|
/*
|
|
* NS record owners cannot legally be wild cards.
|
|
*/
|
|
if (rdataset->type == dns_rdatatype_ns)
|
|
return (DNS_R_INVALIDNS);
|
|
result = add_wildcard_magic(rbtdb, name);
|
|
if (result != ISC_R_SUCCESS)
|
|
return (result);
|
|
}
|
|
|
|
node = NULL;
|
|
result = dns_rbt_addnode(rbtdb->tree, name, &node);
|
|
if (result != ISC_R_SUCCESS && result != ISC_R_EXISTS)
|
|
return (result);
|
|
if (result != ISC_R_EXISTS) {
|
|
dns_name_t foundname;
|
|
dns_name_init(&foundname, NULL);
|
|
dns_rbt_namefromnode(node, &foundname);
|
|
#ifdef DNS_RBT_USEHASH
|
|
node->locknum = node->hashval % rbtdb->node_lock_count;
|
|
#else
|
|
node->locknum = dns_name_hash(&foundname, ISC_TRUE) %
|
|
rbtdb->node_lock_count;
|
|
#endif
|
|
}
|
|
|
|
result = dns_rdataslab_fromrdataset(rdataset, rbtdb->common.mctx,
|
|
®ion,
|
|
sizeof(rdatasetheader_t));
|
|
if (result != ISC_R_SUCCESS)
|
|
return (result);
|
|
newheader = (rdatasetheader_t *)region.base;
|
|
newheader->ttl = rdataset->ttl + loadctx->now; /* XXX overflow check */
|
|
newheader->type = RBTDB_RDATATYPE_VALUE(rdataset->type,
|
|
rdataset->covers);
|
|
newheader->attributes = 0;
|
|
newheader->trust = rdataset->trust;
|
|
newheader->serial = 1;
|
|
newheader->noqname = NULL;
|
|
newheader->count = init_count++;
|
|
newheader->additional_auth = NULL;
|
|
newheader->additional_glue = NULL;
|
|
|
|
result = add(rbtdb, node, rbtdb->current_version, newheader,
|
|
DNS_DBADD_MERGE, ISC_TRUE, NULL, 0);
|
|
if (result == ISC_R_SUCCESS &&
|
|
delegating_type(rbtdb, node, rdataset->type))
|
|
node->find_callback = 1;
|
|
else if (result == DNS_R_UNCHANGED)
|
|
result = ISC_R_SUCCESS;
|
|
|
|
return (result);
|
|
}
|
|
|
|
static isc_result_t
|
|
beginload(dns_db_t *db, dns_addrdatasetfunc_t *addp, dns_dbload_t **dbloadp) {
|
|
rbtdb_load_t *loadctx;
|
|
dns_rbtdb_t *rbtdb;
|
|
|
|
rbtdb = (dns_rbtdb_t *)db;
|
|
|
|
REQUIRE(VALID_RBTDB(rbtdb));
|
|
|
|
loadctx = isc_mem_get(rbtdb->common.mctx, sizeof(*loadctx));
|
|
if (loadctx == NULL)
|
|
return (ISC_R_NOMEMORY);
|
|
|
|
loadctx->rbtdb = rbtdb;
|
|
if (IS_CACHE(rbtdb))
|
|
isc_stdtime_get(&loadctx->now);
|
|
else
|
|
loadctx->now = 0;
|
|
|
|
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);
|
|
|
|
*addp = loading_addrdataset;
|
|
*dbloadp = loadctx;
|
|
|
|
return (ISC_R_SUCCESS);
|
|
}
|
|
|
|
static isc_result_t
|
|
endload(dns_db_t *db, dns_dbload_t **dbloadp) {
|
|
rbtdb_load_t *loadctx;
|
|
dns_rbtdb_t *rbtdb = (dns_rbtdb_t *)db;
|
|
|
|
REQUIRE(VALID_RBTDB(rbtdb));
|
|
REQUIRE(dbloadp != NULL);
|
|
loadctx = *dbloadp;
|
|
REQUIRE(loadctx->rbtdb == rbtdb);
|
|
|
|
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;
|
|
|
|
RBTDB_UNLOCK(&rbtdb->lock, isc_rwlocktype_write);
|
|
|
|
/*
|
|
* If there's a KEY rdataset at the zone origin containing a
|
|
* zone key, we consider the zone secure.
|
|
*/
|
|
if (! IS_CACHE(rbtdb))
|
|
rbtdb->secure = iszonesecure(db, rbtdb->origin_node);
|
|
|
|
*dbloadp = NULL;
|
|
|
|
isc_mem_put(rbtdb->common.mctx, loadctx, sizeof(*loadctx));
|
|
|
|
return (ISC_R_SUCCESS);
|
|
}
|
|
|
|
static isc_result_t
|
|
dump(dns_db_t *db, dns_dbversion_t *version, const char *filename,
|
|
dns_masterformat_t masterformat) {
|
|
dns_rbtdb_t *rbtdb;
|
|
|
|
rbtdb = (dns_rbtdb_t *)db;
|
|
|
|
REQUIRE(VALID_RBTDB(rbtdb));
|
|
|
|
return (dns_master_dump2(rbtdb->common.mctx, db, version,
|
|
&dns_master_style_default,
|
|
filename, masterformat));
|
|
}
|
|
|
|
static void
|
|
delete_callback(void *data, void *arg) {
|
|
dns_rbtdb_t *rbtdb = arg;
|
|
rdatasetheader_t *current, *next;
|
|
|
|
for (current = data; current != NULL; current = next) {
|
|
next = current->next;
|
|
free_rdataset(rbtdb->common.mctx, current);
|
|
}
|
|
}
|
|
|
|
static isc_boolean_t
|
|
issecure(dns_db_t *db) {
|
|
dns_rbtdb_t *rbtdb;
|
|
isc_boolean_t secure;
|
|
|
|
rbtdb = (dns_rbtdb_t *)db;
|
|
|
|
REQUIRE(VALID_RBTDB(rbtdb));
|
|
|
|
RWLOCK(&rbtdb->tree_lock, isc_rwlocktype_read);
|
|
secure = rbtdb->secure;
|
|
RWUNLOCK(&rbtdb->tree_lock, isc_rwlocktype_read);
|
|
|
|
return (secure);
|
|
}
|
|
|
|
static unsigned int
|
|
nodecount(dns_db_t *db) {
|
|
dns_rbtdb_t *rbtdb;
|
|
unsigned int count;
|
|
|
|
rbtdb = (dns_rbtdb_t *)db;
|
|
|
|
REQUIRE(VALID_RBTDB(rbtdb));
|
|
|
|
RWLOCK(&rbtdb->tree_lock, isc_rwlocktype_read);
|
|
count = dns_rbt_nodecount(rbtdb->tree);
|
|
RWUNLOCK(&rbtdb->tree_lock, isc_rwlocktype_read);
|
|
|
|
return (count);
|
|
}
|
|
|
|
static void
|
|
settask(dns_db_t *db, isc_task_t *task) {
|
|
dns_rbtdb_t *rbtdb;
|
|
|
|
rbtdb = (dns_rbtdb_t *)db;
|
|
|
|
REQUIRE(VALID_RBTDB(rbtdb));
|
|
|
|
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 isc_boolean_t
|
|
ispersistent(dns_db_t *db) {
|
|
UNUSED(db);
|
|
return (ISC_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) {
|
|
NODE_STRONGLOCK(&rbtdb->node_locks[onode->locknum].lock);
|
|
new_reference(rbtdb, onode);
|
|
NODE_STRONGUNLOCK(&rbtdb->node_locks[onode->locknum].lock);
|
|
|
|
*nodep = rbtdb->origin_node;
|
|
} else {
|
|
INSIST(!IS_CACHE(rbtdb));
|
|
result = ISC_R_NOTFOUND;
|
|
}
|
|
|
|
return (result);
|
|
}
|
|
|
|
static dns_dbmethods_t zone_methods = {
|
|
attach,
|
|
detach,
|
|
beginload,
|
|
endload,
|
|
dump,
|
|
currentversion,
|
|
newversion,
|
|
attachversion,
|
|
closeversion,
|
|
findnode,
|
|
zone_find,
|
|
zone_findzonecut,
|
|
attachnode,
|
|
detachnode,
|
|
expirenode,
|
|
printnode,
|
|
createiterator,
|
|
zone_findrdataset,
|
|
allrdatasets,
|
|
addrdataset,
|
|
subtractrdataset,
|
|
deleterdataset,
|
|
issecure,
|
|
nodecount,
|
|
ispersistent,
|
|
overmem,
|
|
settask,
|
|
getoriginnode
|
|
};
|
|
|
|
static dns_dbmethods_t cache_methods = {
|
|
attach,
|
|
detach,
|
|
beginload,
|
|
endload,
|
|
dump,
|
|
currentversion,
|
|
newversion,
|
|
attachversion,
|
|
closeversion,
|
|
findnode,
|
|
cache_find,
|
|
cache_findzonecut,
|
|
attachnode,
|
|
detachnode,
|
|
expirenode,
|
|
printnode,
|
|
createiterator,
|
|
cache_findrdataset,
|
|
allrdatasets,
|
|
addrdataset,
|
|
subtractrdataset,
|
|
deleterdataset,
|
|
issecure,
|
|
nodecount,
|
|
ispersistent,
|
|
overmem,
|
|
settask,
|
|
getoriginnode
|
|
};
|
|
|
|
isc_result_t
|
|
#ifdef DNS_RBTDB_VERSION64
|
|
dns_rbtdb64_create
|
|
#else
|
|
dns_rbtdb_create
|
|
#endif
|
|
(isc_mem_t *mctx, dns_name_t *origin, dns_dbtype_t type,
|
|
dns_rdataclass_t rdclass, unsigned int argc, char *argv[],
|
|
void *driverarg, dns_db_t **dbp)
|
|
{
|
|
dns_rbtdb_t *rbtdb;
|
|
isc_result_t result;
|
|
int i;
|
|
dns_name_t name;
|
|
|
|
/* Keep the compiler happy. */
|
|
UNUSED(argc);
|
|
UNUSED(argv);
|
|
UNUSED(driverarg);
|
|
|
|
rbtdb = isc_mem_get(mctx, sizeof(*rbtdb));
|
|
if (rbtdb == NULL)
|
|
return (ISC_R_NOMEMORY);
|
|
|
|
memset(rbtdb, '\0', sizeof(*rbtdb));
|
|
dns_name_init(&rbtdb->common.origin, NULL);
|
|
rbtdb->common.attributes = 0;
|
|
if (type == dns_dbtype_cache) {
|
|
rbtdb->common.methods = &cache_methods;
|
|
rbtdb->common.attributes |= DNS_DBATTR_CACHE;
|
|
} else if (type == dns_dbtype_stub) {
|
|
rbtdb->common.methods = &zone_methods;
|
|
rbtdb->common.attributes |= DNS_DBATTR_STUB;
|
|
} else
|
|
rbtdb->common.methods = &zone_methods;
|
|
rbtdb->common.rdclass = rdclass;
|
|
rbtdb->common.mctx = NULL;
|
|
|
|
result = RBTDB_INITLOCK(&rbtdb->lock);
|
|
if (result != ISC_R_SUCCESS)
|
|
goto cleanup_rbtdb;
|
|
|
|
result = isc_rwlock_init(&rbtdb->tree_lock, 0, 0);
|
|
if (result != ISC_R_SUCCESS)
|
|
goto cleanup_lock;
|
|
|
|
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;
|
|
}
|
|
INSIST(rbtdb->node_lock_count < (1 << DNS_RBT_LOCKLENGTH));
|
|
rbtdb->node_locks = isc_mem_get(mctx, rbtdb->node_lock_count *
|
|
sizeof(rbtdb_nodelock_t));
|
|
if (rbtdb->node_locks == NULL) {
|
|
result = ISC_R_NOMEMORY;
|
|
goto cleanup_tree_lock;
|
|
}
|
|
|
|
rbtdb->active = rbtdb->node_lock_count;
|
|
|
|
for (i = 0; i < (int)(rbtdb->node_lock_count); i++) {
|
|
result = NODE_INITLOCK(&rbtdb->node_locks[i].lock);
|
|
if (result == ISC_R_SUCCESS) {
|
|
result = isc_refcount_init(&rbtdb->node_locks[i].references, 0);
|
|
if (result != ISC_R_SUCCESS)
|
|
NODE_DESTROYLOCK(&rbtdb->node_locks[i].lock);
|
|
}
|
|
if (result != ISC_R_SUCCESS) {
|
|
while (i-- > 0) {
|
|
NODE_DESTROYLOCK(&rbtdb->node_locks[i].lock);
|
|
isc_refcount_decrement(&rbtdb->node_locks[i].references, NULL);
|
|
isc_refcount_destroy(&rbtdb->node_locks[i].references);
|
|
}
|
|
goto cleanup_node_locks;
|
|
}
|
|
rbtdb->node_locks[i].exiting = ISC_FALSE;
|
|
}
|
|
|
|
/*
|
|
* Attach to the mctx. The database will persist so long as there
|
|
* are references to it, and attaching to the mctx ensures that our
|
|
* mctx won't disappear out from under us.
|
|
*/
|
|
isc_mem_attach(mctx, &rbtdb->common.mctx);
|
|
|
|
/*
|
|
* Must be initalized before free_rbtdb() is called.
|
|
*/
|
|
isc_ondestroy_init(&rbtdb->common.ondest);
|
|
|
|
/*
|
|
* Make a copy of the origin name.
|
|
*/
|
|
result = dns_name_dupwithoffsets(origin, mctx, &rbtdb->common.origin);
|
|
if (result != ISC_R_SUCCESS) {
|
|
free_rbtdb(rbtdb, ISC_FALSE, NULL);
|
|
return (result);
|
|
}
|
|
|
|
/*
|
|
* Make the Red-Black Tree.
|
|
*/
|
|
result = dns_rbt_create(mctx, delete_callback, rbtdb, &rbtdb->tree);
|
|
if (result != ISC_R_SUCCESS) {
|
|
free_rbtdb(rbtdb, ISC_FALSE, NULL);
|
|
return (result);
|
|
}
|
|
/*
|
|
* In order to set the node callback bit correctly in zone databases,
|
|
* we need to know if the node has the origin name of the zone.
|
|
* In loading_addrdataset() we could simply compare the new name
|
|
* to the origin name, but this is expensive. Also, we don't know the
|
|
* node name in addrdataset(), so we need another way of knowing the
|
|
* zone's top.
|
|
*
|
|
* We now explicitly create a node for the zone's origin, and then
|
|
* we simply remember the node's address. This is safe, because
|
|
* the top-of-zone node can never be deleted, nor can its address
|
|
* change.
|
|
*/
|
|
if (!IS_CACHE(rbtdb)) {
|
|
rbtdb->origin_node = NULL;
|
|
result = dns_rbt_addnode(rbtdb->tree, &rbtdb->common.origin,
|
|
&rbtdb->origin_node);
|
|
if (result != ISC_R_SUCCESS) {
|
|
INSIST(result != ISC_R_EXISTS);
|
|
free_rbtdb(rbtdb, ISC_FALSE, NULL);
|
|
return (result);
|
|
}
|
|
/*
|
|
* We need to give the origin node the right locknum.
|
|
*/
|
|
dns_name_init(&name, NULL);
|
|
dns_rbt_namefromnode(rbtdb->origin_node, &name);
|
|
#ifdef DNS_RBT_USEHASH
|
|
rbtdb->origin_node->locknum =
|
|
rbtdb->origin_node->hashval %
|
|
rbtdb->node_lock_count;
|
|
#else
|
|
rbtdb->origin_node->locknum =
|
|
dns_name_hash(&name, ISC_TRUE) %
|
|
rbtdb->node_lock_count;
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* Misc. Initialization.
|
|
*/
|
|
result = isc_refcount_init(&rbtdb->references, 1);
|
|
if (result != ISC_R_SUCCESS) {
|
|
free_rbtdb(rbtdb, ISC_FALSE, NULL);
|
|
return (result);
|
|
}
|
|
rbtdb->attributes = 0;
|
|
rbtdb->secure = ISC_FALSE;
|
|
rbtdb->overmem = ISC_FALSE;
|
|
rbtdb->task = NULL;
|
|
|
|
/*
|
|
* Version Initialization.
|
|
*/
|
|
rbtdb->current_serial = 1;
|
|
rbtdb->least_serial = 1;
|
|
rbtdb->next_serial = 2;
|
|
rbtdb->current_version = allocate_version(mctx, 1, 1, ISC_FALSE);
|
|
if (rbtdb->current_version == NULL) {
|
|
isc_refcount_decrement(&rbtdb->references, NULL);
|
|
isc_refcount_destroy(&rbtdb->references);
|
|
free_rbtdb(rbtdb, ISC_FALSE, NULL);
|
|
return (ISC_R_NOMEMORY);
|
|
}
|
|
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);
|
|
|
|
cleanup_lock:
|
|
RBTDB_DESTROYLOCK(&rbtdb->lock);
|
|
|
|
cleanup_rbtdb:
|
|
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 DNS_RDATASET_FIXED
|
|
if ((rdataset->attributes & DNS_RDATASETATTR_LOADORDER) == 0)
|
|
raw += 2 + (4 * count);
|
|
else
|
|
#endif
|
|
raw += 2;
|
|
|
|
/*
|
|
* The privateuint4 field is the number of rdata beyond the
|
|
* cursor position, so we decrement the total count by one
|
|
* before storing it.
|
|
*
|
|
* 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
|
|
length = raw[0] * 256 + raw[1];
|
|
raw += length;
|
|
#if DNS_RDATASET_FIXED
|
|
}
|
|
rdataset->private5 = raw + 4; /* length(2) + order(2) */
|
|
#else
|
|
rdataset->private5 = raw + 2; /* length(2) */
|
|
#endif
|
|
|
|
return (ISC_R_SUCCESS);
|
|
}
|
|
|
|
static void
|
|
rdataset_current(dns_rdataset_t *rdataset, dns_rdata_t *rdata) {
|
|
unsigned char *raw = rdataset->private5; /* RDATASLAB */
|
|
#if DNS_RDATASET_FIXED
|
|
unsigned int offset;
|
|
#endif
|
|
isc_region_t r;
|
|
|
|
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) {
|
|
offset = (raw[0] << 24) + (raw[1] << 16) +
|
|
(raw[2] << 8) + raw[3];
|
|
raw = rdataset->private3;
|
|
raw += offset;
|
|
}
|
|
#endif
|
|
r.length = raw[0] * 256 + raw[1];
|
|
|
|
#if DNS_RDATASET_FIXED
|
|
raw += 4;
|
|
#else
|
|
raw += 2;
|
|
#endif
|
|
r.base = raw;
|
|
dns_rdata_fromregion(rdata, rdataset->rdclass, rdataset->type, &r);
|
|
}
|
|
|
|
static void
|
|
rdataset_clone(dns_rdataset_t *source, dns_rdataset_t *target) {
|
|
dns_db_t *db = source->private1;
|
|
dns_dbnode_t *node = source->private2;
|
|
dns_dbnode_t *cloned_node = NULL;
|
|
|
|
attachnode(db, node, &cloned_node);
|
|
*target = *source;
|
|
|
|
/*
|
|
* Reset iterator state.
|
|
*/
|
|
target->privateuint4 = 0;
|
|
target->private5 = NULL;
|
|
}
|
|
|
|
static unsigned int
|
|
rdataset_count(dns_rdataset_t *rdataset) {
|
|
unsigned char *raw = rdataset->private3; /* 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;
|
|
struct noqname *noqname = rdataset->private6;
|
|
|
|
cloned_node = NULL;
|
|
attachnode(db, node, &cloned_node);
|
|
nsec->methods = &rdataset_methods;
|
|
nsec->rdclass = db->rdclass;
|
|
nsec->type = dns_rdatatype_nsec;
|
|
nsec->covers = 0;
|
|
nsec->ttl = rdataset->ttl;
|
|
nsec->trust = rdataset->trust;
|
|
nsec->private1 = rdataset->private1;
|
|
nsec->private2 = rdataset->private2;
|
|
nsec->private3 = noqname->nsec;
|
|
nsec->privateuint4 = 0;
|
|
nsec->private5 = NULL;
|
|
nsec->private6 = NULL;
|
|
|
|
cloned_node = NULL;
|
|
attachnode(db, node, &cloned_node);
|
|
nsecsig->methods = &rdataset_methods;
|
|
nsecsig->rdclass = db->rdclass;
|
|
nsecsig->type = dns_rdatatype_rrsig;
|
|
nsecsig->covers = dns_rdatatype_nsec;
|
|
nsecsig->ttl = rdataset->ttl;
|
|
nsecsig->trust = rdataset->trust;
|
|
nsecsig->private1 = rdataset->private1;
|
|
nsecsig->private2 = rdataset->private2;
|
|
nsecsig->private3 = noqname->nsecsig;
|
|
nsecsig->privateuint4 = 0;
|
|
nsecsig->private5 = NULL;
|
|
nsec->private6 = NULL;
|
|
|
|
dns_name_clone(&noqname->name, name);
|
|
|
|
return (ISC_R_SUCCESS);
|
|
}
|
|
|
|
/*
|
|
* Rdataset Iterator Methods
|
|
*/
|
|
|
|
static void
|
|
rdatasetiter_destroy(dns_rdatasetiter_t **iteratorp) {
|
|
rbtdb_rdatasetiter_t *rbtiterator;
|
|
|
|
rbtiterator = (rbtdb_rdatasetiter_t *)(*iteratorp);
|
|
|
|
if (rbtiterator->common.version != NULL)
|
|
closeversion(rbtiterator->common.db,
|
|
&rbtiterator->common.version, ISC_FALSE);
|
|
detachnode(rbtiterator->common.db, &rbtiterator->common.node);
|
|
isc_mem_put(rbtiterator->common.db->mctx, rbtiterator,
|
|
sizeof(*rbtiterator));
|
|
|
|
*iteratorp = NULL;
|
|
}
|
|
|
|
static isc_result_t
|
|
rdatasetiter_first(dns_rdatasetiter_t *iterator) {
|
|
rbtdb_rdatasetiter_t *rbtiterator = (rbtdb_rdatasetiter_t *)iterator;
|
|
dns_rbtdb_t *rbtdb = (dns_rbtdb_t *)(rbtiterator->common.db);
|
|
dns_rbtnode_t *rbtnode = rbtiterator->common.node;
|
|
rbtdb_version_t *rbtversion = rbtiterator->common.version;
|
|
rdatasetheader_t *header, *top_next;
|
|
rbtdb_serial_t serial;
|
|
isc_stdtime_t now;
|
|
|
|
if (IS_CACHE(rbtdb)) {
|
|
serial = 1;
|
|
now = rbtiterator->common.now;
|
|
} else {
|
|
serial = rbtversion->serial;
|
|
now = 0;
|
|
}
|
|
|
|
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 (header->serial <= serial && !IGNORE(header)) {
|
|
/*
|
|
* Is this a "this rdataset doesn't exist"
|
|
* record? Or is it too old in the cache?
|
|
*
|
|
* Note: unlike everywhere else, we
|
|
* check for now > header->ttl instead
|
|
* of now >= header->ttl. This allows
|
|
* ANY and RRSIG queries for 0 TTL
|
|
* rdatasets to work.
|
|
*/
|
|
if (NONEXISTENT(header) ||
|
|
(now != 0 && now > header->ttl))
|
|
header = NULL;
|
|
break;
|
|
} else
|
|
header = header->down;
|
|
} while (header != NULL);
|
|
if (header != NULL)
|
|
break;
|
|
}
|
|
|
|
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;
|
|
isc_stdtime_t now;
|
|
rbtdb_rdatatype_t type, negtype;
|
|
dns_rdatatype_t rdtype, covers;
|
|
|
|
header = rbtiterator->current;
|
|
if (header == NULL)
|
|
return (ISC_R_NOMORE);
|
|
|
|
if (IS_CACHE(rbtdb)) {
|
|
serial = 1;
|
|
now = rbtiterator->common.now;
|
|
} else {
|
|
serial = rbtversion->serial;
|
|
now = 0;
|
|
}
|
|
|
|
NODE_LOCK(&rbtdb->node_locks[rbtnode->locknum].lock,
|
|
isc_rwlocktype_read);
|
|
|
|
type = header->type;
|
|
rdtype = RBTDB_RDATATYPE_BASE(header->type);
|
|
if (rdtype == 0) {
|
|
covers = RBTDB_RDATATYPE_EXT(header->type);
|
|
negtype = RBTDB_RDATATYPE_VALUE(covers, 0);
|
|
} else
|
|
negtype = RBTDB_RDATATYPE_VALUE(0, rdtype);
|
|
for (header = header->next; header != NULL; header = top_next) {
|
|
top_next = header->next;
|
|
/*
|
|
* If not walking back up the down list.
|
|
*/
|
|
if (header->type != type && header->type != negtype) {
|
|
do {
|
|
if (header->serial <= serial &&
|
|
!IGNORE(header)) {
|
|
/*
|
|
* Is this a "this rdataset doesn't
|
|
* exist" record?
|
|
*
|
|
* Note: unlike everywhere else, we
|
|
* check for now > header->ttl instead
|
|
* of now >= header->ttl. This allows
|
|
* ANY and RRSIG queries for 0 TTL
|
|
* rdatasets to work.
|
|
*/
|
|
if ((header->attributes &
|
|
RDATASET_ATTR_NONEXISTENT) != 0 ||
|
|
(now != 0 && now > header->ttl))
|
|
header = NULL;
|
|
break;
|
|
} else
|
|
header = header->down;
|
|
} while (header != NULL);
|
|
if (header != NULL)
|
|
break;
|
|
}
|
|
}
|
|
|
|
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,
|
|
rdataset);
|
|
|
|
NODE_UNLOCK(&rbtdb->node_locks[rbtnode->locknum].lock,
|
|
isc_rwlocktype_read);
|
|
}
|
|
|
|
|
|
/*
|
|
* Database Iterator Methods
|
|
*/
|
|
|
|
static inline void
|
|
reference_iter_node(rbtdb_dbiterator_t *rbtdbiter) {
|
|
dns_rbtdb_t *rbtdb = (dns_rbtdb_t *)rbtdbiter->common.db;
|
|
dns_rbtnode_t *node = rbtdbiter->node;
|
|
|
|
if (node == NULL)
|
|
return;
|
|
|
|
INSIST(rbtdbiter->tree_locked != isc_rwlocktype_none);
|
|
NODE_STRONGLOCK(&rbtdb->node_locks[node->locknum].lock);
|
|
new_reference(rbtdb, node);
|
|
NODE_STRONGUNLOCK(&rbtdb->node_locks[node->locknum].lock);
|
|
}
|
|
|
|
static inline void
|
|
dereference_iter_node(rbtdb_dbiterator_t *rbtdbiter) {
|
|
dns_rbtdb_t *rbtdb = (dns_rbtdb_t *)rbtdbiter->common.db;
|
|
dns_rbtnode_t *node = rbtdbiter->node;
|
|
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);
|
|
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;
|
|
isc_boolean_t was_read_locked = ISC_FALSE;
|
|
nodelock_t *lock;
|
|
int i;
|
|
|
|
if (rbtdbiter->delete != 0) {
|
|
/*
|
|
* Note that "%d node of %d in tree" can report things like
|
|
* "flush_deletions: 59 nodes of 41 in tree". This means
|
|
* That some nodes appear on the deletions list more than
|
|
* once. Only the last occurence will actually be deleted.
|
|
*/
|
|
isc_log_write(dns_lctx, DNS_LOGCATEGORY_DATABASE,
|
|
DNS_LOGMODULE_CACHE, ISC_LOG_DEBUG(1),
|
|
"flush_deletions: %d nodes of %d in tree",
|
|
rbtdbiter->delete,
|
|
dns_rbt_nodecount(rbtdb->tree));
|
|
|
|
if (rbtdbiter->tree_locked == isc_rwlocktype_read) {
|
|
RWUNLOCK(&rbtdb->tree_lock, isc_rwlocktype_read);
|
|
was_read_locked = ISC_TRUE;
|
|
}
|
|
RWLOCK(&rbtdb->tree_lock, isc_rwlocktype_write);
|
|
rbtdbiter->tree_locked = isc_rwlocktype_write;
|
|
|
|
for (i = 0; i < rbtdbiter->delete; i++) {
|
|
node = rbtdbiter->deletions[i];
|
|
lock = &rbtdb->node_locks[node->locknum].lock;
|
|
|
|
NODE_LOCK(lock, isc_rwlocktype_read);
|
|
decrement_reference(rbtdb, node, 0,
|
|
isc_rwlocktype_read,
|
|
rbtdbiter->tree_locked);
|
|
NODE_UNLOCK(lock, isc_rwlocktype_read);
|
|
}
|
|
|
|
rbtdbiter->delete = 0;
|
|
|
|
RWUNLOCK(&rbtdb->tree_lock, isc_rwlocktype_write);
|
|
if (was_read_locked) {
|
|
RWLOCK(&rbtdb->tree_lock, isc_rwlocktype_read);
|
|
rbtdbiter->tree_locked = isc_rwlocktype_read;
|
|
|
|
} else {
|
|
rbtdbiter->tree_locked = isc_rwlocktype_none;
|
|
}
|
|
}
|
|
}
|
|
|
|
static inline void
|
|
resume_iteration(rbtdb_dbiterator_t *rbtdbiter) {
|
|
dns_rbtdb_t *rbtdb = (dns_rbtdb_t *)rbtdbiter->common.db;
|
|
|
|
REQUIRE(rbtdbiter->paused);
|
|
REQUIRE(rbtdbiter->tree_locked == isc_rwlocktype_none);
|
|
|
|
RWLOCK(&rbtdb->tree_lock, isc_rwlocktype_read);
|
|
rbtdbiter->tree_locked = isc_rwlocktype_read;
|
|
|
|
rbtdbiter->paused = ISC_FALSE;
|
|
}
|
|
|
|
static void
|
|
dbiterator_destroy(dns_dbiterator_t **iteratorp) {
|
|
rbtdb_dbiterator_t *rbtdbiter = (rbtdb_dbiterator_t *)(*iteratorp);
|
|
dns_rbtdb_t *rbtdb = (dns_rbtdb_t *)rbtdbiter->common.db;
|
|
dns_db_t *db = NULL;
|
|
|
|
if (rbtdbiter->tree_locked == isc_rwlocktype_read) {
|
|
RWUNLOCK(&rbtdb->tree_lock, isc_rwlocktype_read);
|
|
rbtdbiter->tree_locked = isc_rwlocktype_none;
|
|
} else
|
|
INSIST(rbtdbiter->tree_locked == isc_rwlocktype_none);
|
|
|
|
dereference_iter_node(rbtdbiter);
|
|
|
|
flush_deletions(rbtdbiter);
|
|
|
|
dns_db_attach(rbtdbiter->common.db, &db);
|
|
dns_db_detach(&rbtdbiter->common.db);
|
|
|
|
dns_rbtnodechain_reset(&rbtdbiter->chain);
|
|
isc_mem_put(db->mctx, rbtdbiter, sizeof(*rbtdbiter));
|
|
dns_db_detach(&db);
|
|
|
|
*iteratorp = NULL;
|
|
}
|
|
|
|
static isc_result_t
|
|
dbiterator_first(dns_dbiterator_t *iterator) {
|
|
isc_result_t result;
|
|
rbtdb_dbiterator_t *rbtdbiter = (rbtdb_dbiterator_t *)iterator;
|
|
dns_rbtdb_t *rbtdb = (dns_rbtdb_t *)iterator->db;
|
|
dns_name_t *name, *origin;
|
|
|
|
if (rbtdbiter->result != ISC_R_SUCCESS &&
|
|
rbtdbiter->result != ISC_R_NOMORE)
|
|
return (rbtdbiter->result);
|
|
|
|
if (rbtdbiter->paused)
|
|
resume_iteration(rbtdbiter);
|
|
|
|
dereference_iter_node(rbtdbiter);
|
|
|
|
name = dns_fixedname_name(&rbtdbiter->name);
|
|
origin = dns_fixedname_name(&rbtdbiter->origin);
|
|
dns_rbtnodechain_reset(&rbtdbiter->chain);
|
|
|
|
result = dns_rbtnodechain_first(&rbtdbiter->chain, rbtdb->tree, name,
|
|
origin);
|
|
|
|
if (result == ISC_R_SUCCESS || result == DNS_R_NEWORIGIN) {
|
|
result = dns_rbtnodechain_current(&rbtdbiter->chain, NULL,
|
|
NULL, &rbtdbiter->node);
|
|
if (result == ISC_R_SUCCESS) {
|
|
rbtdbiter->new_origin = ISC_TRUE;
|
|
reference_iter_node(rbtdbiter);
|
|
}
|
|
} else {
|
|
INSIST(result == ISC_R_NOTFOUND);
|
|
result = ISC_R_NOMORE; /* The tree is empty. */
|
|
}
|
|
|
|
rbtdbiter->result = result;
|
|
|
|
return (result);
|
|
}
|
|
|
|
static isc_result_t
|
|
dbiterator_last(dns_dbiterator_t *iterator) {
|
|
isc_result_t result;
|
|
rbtdb_dbiterator_t *rbtdbiter = (rbtdb_dbiterator_t *)iterator;
|
|
dns_rbtdb_t *rbtdb = (dns_rbtdb_t *)iterator->db;
|
|
dns_name_t *name, *origin;
|
|
|
|
if (rbtdbiter->result != ISC_R_SUCCESS &&
|
|
rbtdbiter->result != ISC_R_NOMORE)
|
|
return (rbtdbiter->result);
|
|
|
|
if (rbtdbiter->paused)
|
|
resume_iteration(rbtdbiter);
|
|
|
|
dereference_iter_node(rbtdbiter);
|
|
|
|
name = dns_fixedname_name(&rbtdbiter->name);
|
|
origin = dns_fixedname_name(&rbtdbiter->origin);
|
|
dns_rbtnodechain_reset(&rbtdbiter->chain);
|
|
|
|
result = dns_rbtnodechain_last(&rbtdbiter->chain, rbtdb->tree, name,
|
|
origin);
|
|
if (result == ISC_R_SUCCESS || result == DNS_R_NEWORIGIN) {
|
|
result = dns_rbtnodechain_current(&rbtdbiter->chain, NULL,
|
|
NULL, &rbtdbiter->node);
|
|
if (result == ISC_R_SUCCESS) {
|
|
rbtdbiter->new_origin = ISC_TRUE;
|
|
reference_iter_node(rbtdbiter);
|
|
}
|
|
} else {
|
|
INSIST(result == ISC_R_NOTFOUND);
|
|
result = ISC_R_NOMORE; /* The tree is empty. */
|
|
}
|
|
|
|
rbtdbiter->result = result;
|
|
|
|
return (result);
|
|
}
|
|
|
|
static isc_result_t
|
|
dbiterator_seek(dns_dbiterator_t *iterator, dns_name_t *name) {
|
|
isc_result_t result;
|
|
rbtdb_dbiterator_t *rbtdbiter = (rbtdb_dbiterator_t *)iterator;
|
|
dns_rbtdb_t *rbtdb = (dns_rbtdb_t *)iterator->db;
|
|
dns_name_t *iname, *origin;
|
|
|
|
if (rbtdbiter->result != ISC_R_SUCCESS &&
|
|
rbtdbiter->result != ISC_R_NOMORE)
|
|
return (rbtdbiter->result);
|
|
|
|
if (rbtdbiter->paused)
|
|
resume_iteration(rbtdbiter);
|
|
|
|
dereference_iter_node(rbtdbiter);
|
|
|
|
iname = dns_fixedname_name(&rbtdbiter->name);
|
|
origin = dns_fixedname_name(&rbtdbiter->origin);
|
|
dns_rbtnodechain_reset(&rbtdbiter->chain);
|
|
|
|
result = dns_rbt_findnode(rbtdb->tree, name, NULL, &rbtdbiter->node,
|
|
&rbtdbiter->chain, DNS_RBTFIND_EMPTYDATA,
|
|
NULL, NULL);
|
|
if (result == ISC_R_SUCCESS) {
|
|
result = dns_rbtnodechain_current(&rbtdbiter->chain, iname,
|
|
origin, NULL);
|
|
if (result == ISC_R_SUCCESS) {
|
|
rbtdbiter->new_origin = ISC_TRUE;
|
|
reference_iter_node(rbtdbiter);
|
|
}
|
|
|
|
} else if (result == DNS_R_PARTIALMATCH)
|
|
result = ISC_R_NOTFOUND;
|
|
|
|
rbtdbiter->result = result;
|
|
|
|
return (result);
|
|
}
|
|
|
|
static isc_result_t
|
|
dbiterator_prev(dns_dbiterator_t *iterator) {
|
|
isc_result_t result;
|
|
rbtdb_dbiterator_t *rbtdbiter = (rbtdb_dbiterator_t *)iterator;
|
|
dns_name_t *name, *origin;
|
|
|
|
REQUIRE(rbtdbiter->node != NULL);
|
|
|
|
if (rbtdbiter->result != ISC_R_SUCCESS)
|
|
return (rbtdbiter->result);
|
|
|
|
if (rbtdbiter->paused)
|
|
resume_iteration(rbtdbiter);
|
|
|
|
name = dns_fixedname_name(&rbtdbiter->name);
|
|
origin = dns_fixedname_name(&rbtdbiter->origin);
|
|
result = dns_rbtnodechain_prev(&rbtdbiter->chain, name, origin);
|
|
|
|
dereference_iter_node(rbtdbiter);
|
|
|
|
if (result == DNS_R_NEWORIGIN || result == ISC_R_SUCCESS) {
|
|
rbtdbiter->new_origin = ISC_TF(result == DNS_R_NEWORIGIN);
|
|
result = dns_rbtnodechain_current(&rbtdbiter->chain, NULL,
|
|
NULL, &rbtdbiter->node);
|
|
}
|
|
|
|
if (result == ISC_R_SUCCESS)
|
|
reference_iter_node(rbtdbiter);
|
|
|
|
rbtdbiter->result = result;
|
|
|
|
return (result);
|
|
}
|
|
|
|
static isc_result_t
|
|
dbiterator_next(dns_dbiterator_t *iterator) {
|
|
isc_result_t result;
|
|
rbtdb_dbiterator_t *rbtdbiter = (rbtdb_dbiterator_t *)iterator;
|
|
dns_name_t *name, *origin;
|
|
|
|
REQUIRE(rbtdbiter->node != NULL);
|
|
|
|
if (rbtdbiter->result != ISC_R_SUCCESS)
|
|
return (rbtdbiter->result);
|
|
|
|
if (rbtdbiter->paused)
|
|
resume_iteration(rbtdbiter);
|
|
|
|
name = dns_fixedname_name(&rbtdbiter->name);
|
|
origin = dns_fixedname_name(&rbtdbiter->origin);
|
|
result = dns_rbtnodechain_next(&rbtdbiter->chain, name, origin);
|
|
|
|
dereference_iter_node(rbtdbiter);
|
|
|
|
if (result == DNS_R_NEWORIGIN || result == ISC_R_SUCCESS) {
|
|
rbtdbiter->new_origin = ISC_TF(result == DNS_R_NEWORIGIN);
|
|
result = dns_rbtnodechain_current(&rbtdbiter->chain, NULL,
|
|
NULL, &rbtdbiter->node);
|
|
}
|
|
if (result == ISC_R_SUCCESS)
|
|
reference_iter_node(rbtdbiter);
|
|
|
|
rbtdbiter->result = result;
|
|
|
|
return (result);
|
|
}
|
|
|
|
static isc_result_t
|
|
dbiterator_current(dns_dbiterator_t *iterator, dns_dbnode_t **nodep,
|
|
dns_name_t *name)
|
|
{
|
|
dns_rbtdb_t *rbtdb = (dns_rbtdb_t *)iterator->db;
|
|
rbtdb_dbiterator_t *rbtdbiter = (rbtdb_dbiterator_t *)iterator;
|
|
dns_rbtnode_t *node = rbtdbiter->node;
|
|
isc_result_t result;
|
|
dns_name_t *nodename = dns_fixedname_name(&rbtdbiter->name);
|
|
dns_name_t *origin = dns_fixedname_name(&rbtdbiter->origin);
|
|
|
|
REQUIRE(rbtdbiter->result == ISC_R_SUCCESS);
|
|
REQUIRE(rbtdbiter->node != NULL);
|
|
|
|
if (rbtdbiter->paused)
|
|
resume_iteration(rbtdbiter);
|
|
|
|
if (name != NULL) {
|
|
if (rbtdbiter->common.relative_names)
|
|
origin = NULL;
|
|
result = dns_name_concatenate(nodename, origin, name, NULL);
|
|
if (result != ISC_R_SUCCESS)
|
|
return (result);
|
|
if (rbtdbiter->common.relative_names && rbtdbiter->new_origin)
|
|
result = DNS_R_NEWORIGIN;
|
|
} else
|
|
result = ISC_R_SUCCESS;
|
|
|
|
NODE_STRONGLOCK(&rbtdb->node_locks[node->locknum].lock);
|
|
new_reference(rbtdb, node);
|
|
NODE_STRONGUNLOCK(&rbtdb->node_locks[node->locknum].lock);
|
|
|
|
*nodep = rbtdbiter->node;
|
|
|
|
if (iterator->cleaning && result == ISC_R_SUCCESS) {
|
|
isc_result_t expire_result;
|
|
|
|
/*
|
|
* If the deletion array is full, flush it before trying
|
|
* to expire the current node. The current node can't
|
|
* fully deleted while the iteration cursor is still on it.
|
|
*/
|
|
if (rbtdbiter->delete == DELETION_BATCH_MAX)
|
|
flush_deletions(rbtdbiter);
|
|
|
|
expire_result = expirenode(iterator->db, *nodep, 0);
|
|
|
|
/*
|
|
* expirenode() currently always returns success.
|
|
*/
|
|
if (expire_result == ISC_R_SUCCESS && node->down == NULL) {
|
|
unsigned int refs;
|
|
|
|
rbtdbiter->deletions[rbtdbiter->delete++] = node;
|
|
NODE_STRONGLOCK(&rbtdb->node_locks[node->locknum].lock);
|
|
dns_rbtnode_refincrement(node, &refs);
|
|
INSIST(refs != 0);
|
|
NODE_STRONGUNLOCK(&rbtdb->node_locks[node->locknum].lock);
|
|
}
|
|
}
|
|
|
|
return (result);
|
|
}
|
|
|
|
static isc_result_t
|
|
dbiterator_pause(dns_dbiterator_t *iterator) {
|
|
dns_rbtdb_t *rbtdb = (dns_rbtdb_t *)iterator->db;
|
|
rbtdb_dbiterator_t *rbtdbiter = (rbtdb_dbiterator_t *)iterator;
|
|
|
|
if (rbtdbiter->result != ISC_R_SUCCESS &&
|
|
rbtdbiter->result != ISC_R_NOMORE)
|
|
return (rbtdbiter->result);
|
|
|
|
if (rbtdbiter->paused)
|
|
return (ISC_R_SUCCESS);
|
|
|
|
rbtdbiter->paused = ISC_TRUE;
|
|
|
|
if (rbtdbiter->tree_locked != isc_rwlocktype_none) {
|
|
INSIST(rbtdbiter->tree_locked == isc_rwlocktype_read);
|
|
RWUNLOCK(&rbtdb->tree_lock, isc_rwlocktype_read);
|
|
rbtdbiter->tree_locked = isc_rwlocktype_none;
|
|
}
|
|
|
|
flush_deletions(rbtdbiter);
|
|
|
|
return (ISC_R_SUCCESS);
|
|
}
|
|
|
|
static isc_result_t
|
|
dbiterator_origin(dns_dbiterator_t *iterator, dns_name_t *name) {
|
|
rbtdb_dbiterator_t *rbtdbiter = (rbtdb_dbiterator_t *)iterator;
|
|
dns_name_t *origin = dns_fixedname_name(&rbtdbiter->origin);
|
|
|
|
if (rbtdbiter->result != ISC_R_SUCCESS)
|
|
return (rbtdbiter->result);
|
|
|
|
return (dns_name_copy(origin, name, NULL));
|
|
}
|
|
|
|
/*%
|
|
* Additional cache routines.
|
|
*/
|
|
static isc_result_t
|
|
rdataset_getadditional(dns_rdataset_t *rdataset, dns_rdatasetadditional_t type,
|
|
dns_rdatatype_t qtype, dns_acache_t *acache,
|
|
dns_zone_t **zonep, dns_db_t **dbp,
|
|
dns_dbversion_t **versionp, dns_dbnode_t **nodep,
|
|
dns_name_t *fname, dns_message_t *msg,
|
|
isc_stdtime_t now)
|
|
{
|
|
dns_rbtdb_t *rbtdb = rdataset->private1;
|
|
dns_rbtnode_t *rbtnode = rdataset->private2;
|
|
unsigned char *raw = rdataset->private3; /* RDATASLAB */
|
|
unsigned int current_count = rdataset->privateuint4;
|
|
unsigned int count;
|
|
rdatasetheader_t *header;
|
|
nodelock_t *nodelock;
|
|
unsigned int total_count;
|
|
acachectl_t *acarray;
|
|
dns_acacheentry_t *entry;
|
|
isc_result_t result;
|
|
|
|
UNUSED(qtype); /* we do not use this value at least for now */
|
|
UNUSED(acache);
|
|
|
|
header = (struct rdatasetheader *)(raw - sizeof(*header));
|
|
|
|
total_count = raw[0] * 256 + raw[1];
|
|
INSIST(total_count > current_count);
|
|
count = total_count - current_count - 1;
|
|
|
|
acarray = NULL;
|
|
|
|
nodelock = &rbtdb->node_locks[rbtnode->locknum].lock;
|
|
NODE_LOCK(nodelock, isc_rwlocktype_read);
|
|
|
|
switch (type) {
|
|
case dns_rdatasetadditional_fromauth:
|
|
acarray = header->additional_auth;
|
|
break;
|
|
case dns_rdatasetadditional_fromcache:
|
|
acarray = NULL;
|
|
break;
|
|
case dns_rdatasetadditional_fromglue:
|
|
acarray = header->additional_glue;
|
|
break;
|
|
default:
|
|
INSIST(0);
|
|
}
|
|
|
|
if (acarray == NULL) {
|
|
if (type != dns_rdatasetadditional_fromcache)
|
|
dns_acache_countquerymiss(acache);
|
|
NODE_UNLOCK(nodelock, isc_rwlocktype_read);
|
|
return (ISC_R_NOTFOUND);
|
|
}
|
|
|
|
if (acarray[count].entry == NULL) {
|
|
dns_acache_countquerymiss(acache);
|
|
NODE_UNLOCK(nodelock, isc_rwlocktype_read);
|
|
return (ISC_R_NOTFOUND);
|
|
}
|
|
|
|
entry = NULL;
|
|
dns_acache_attachentry(acarray[count].entry, &entry);
|
|
|
|
NODE_UNLOCK(nodelock, isc_rwlocktype_read);
|
|
|
|
result = dns_acache_getentry(entry, zonep, dbp, versionp,
|
|
nodep, fname, msg, now);
|
|
|
|
dns_acache_detachentry(&entry);
|
|
|
|
return (result);
|
|
}
|
|
|
|
static void
|
|
acache_callback(dns_acacheentry_t *entry, void **arg) {
|
|
dns_rbtdb_t *rbtdb;
|
|
dns_rbtnode_t *rbtnode;
|
|
nodelock_t *nodelock;
|
|
acachectl_t *acarray = NULL;
|
|
acache_cbarg_t *cbarg;
|
|
unsigned int count;
|
|
|
|
REQUIRE(arg != NULL);
|
|
cbarg = *arg;
|
|
|
|
/*
|
|
* The caller must hold the entry lock.
|
|
*/
|
|
|
|
rbtdb = (dns_rbtdb_t *)cbarg->db;
|
|
rbtnode = (dns_rbtnode_t *)cbarg->node;
|
|
|
|
nodelock = &rbtdb->node_locks[rbtnode->locknum].lock;
|
|
NODE_LOCK(nodelock, isc_rwlocktype_write);
|
|
|
|
switch (cbarg->type) {
|
|
case dns_rdatasetadditional_fromauth:
|
|
acarray = cbarg->header->additional_auth;
|
|
break;
|
|
case dns_rdatasetadditional_fromglue:
|
|
acarray = cbarg->header->additional_glue;
|
|
break;
|
|
default:
|
|
INSIST(0);
|
|
}
|
|
|
|
count = cbarg->count;
|
|
if (acarray != NULL && acarray[count].entry == entry) {
|
|
acarray[count].entry = NULL;
|
|
INSIST(acarray[count].cbarg == cbarg);
|
|
isc_mem_put(rbtdb->common.mctx, cbarg, sizeof(acache_cbarg_t));
|
|
acarray[count].cbarg = NULL;
|
|
} else
|
|
isc_mem_put(rbtdb->common.mctx, cbarg, sizeof(acache_cbarg_t));
|
|
|
|
dns_acache_detachentry(&entry);
|
|
|
|
NODE_UNLOCK(nodelock, isc_rwlocktype_write);
|
|
|
|
dns_db_detachnode((dns_db_t *)rbtdb, (dns_dbnode_t **)(void*)&rbtnode);
|
|
dns_db_detach((dns_db_t **)(void*)&rbtdb);
|
|
|
|
*arg = NULL;
|
|
}
|
|
|
|
static void
|
|
acache_cancelentry(isc_mem_t *mctx, dns_acacheentry_t *entry,
|
|
acache_cbarg_t **cbargp)
|
|
{
|
|
acache_cbarg_t *cbarg;
|
|
|
|
REQUIRE(mctx != NULL);
|
|
REQUIRE(entry != NULL);
|
|
REQUIRE(cbargp != NULL && *cbargp != NULL);
|
|
|
|
cbarg = *cbargp;
|
|
|
|
dns_acache_cancelentry(entry);
|
|
dns_db_detachnode(cbarg->db, &cbarg->node);
|
|
dns_db_detach(&cbarg->db);
|
|
|
|
isc_mem_put(mctx, cbarg, sizeof(acache_cbarg_t));
|
|
|
|
*cbargp = NULL;
|
|
}
|
|
|
|
static isc_result_t
|
|
rdataset_setadditional(dns_rdataset_t *rdataset, dns_rdatasetadditional_t type,
|
|
dns_rdatatype_t qtype, dns_acache_t *acache,
|
|
dns_zone_t *zone, dns_db_t *db,
|
|
dns_dbversion_t *version, dns_dbnode_t *node,
|
|
dns_name_t *fname)
|
|
{
|
|
dns_rbtdb_t *rbtdb = rdataset->private1;
|
|
dns_rbtnode_t *rbtnode = rdataset->private2;
|
|
unsigned char *raw = rdataset->private3; /* RDATASLAB */
|
|
unsigned int current_count = rdataset->privateuint4;
|
|
rdatasetheader_t *header;
|
|
unsigned int total_count, count;
|
|
nodelock_t *nodelock;
|
|
isc_result_t result;
|
|
acachectl_t *acarray;
|
|
dns_acacheentry_t *newentry, *oldentry = NULL;
|
|
acache_cbarg_t *newcbarg, *oldcbarg = NULL;
|
|
|
|
UNUSED(qtype);
|
|
|
|
if (type == dns_rdatasetadditional_fromcache)
|
|
return (ISC_R_SUCCESS);
|
|
|
|
header = (struct rdatasetheader *)(raw - sizeof(*header));
|
|
|
|
total_count = raw[0] * 256 + raw[1];
|
|
INSIST(total_count > current_count);
|
|
count = total_count - current_count - 1; /* should be private data */
|
|
|
|
newcbarg = isc_mem_get(rbtdb->common.mctx, sizeof(*newcbarg));
|
|
if (newcbarg == NULL)
|
|
return (ISC_R_NOMEMORY);
|
|
newcbarg->type = type;
|
|
newcbarg->count = count;
|
|
newcbarg->header = header;
|
|
newcbarg->db = NULL;
|
|
dns_db_attach((dns_db_t *)rbtdb, &newcbarg->db);
|
|
newcbarg->node = NULL;
|
|
dns_db_attachnode((dns_db_t *)rbtdb, (dns_dbnode_t *)rbtnode,
|
|
&newcbarg->node);
|
|
newentry = NULL;
|
|
result = dns_acache_createentry(acache, (dns_db_t *)rbtdb,
|
|
acache_callback, newcbarg, &newentry);
|
|
if (result != ISC_R_SUCCESS)
|
|
goto fail;
|
|
/* Set cache data in the new entry. */
|
|
result = dns_acache_setentry(acache, newentry, zone, db,
|
|
version, node, fname);
|
|
if (result != ISC_R_SUCCESS)
|
|
goto fail;
|
|
|
|
nodelock = &rbtdb->node_locks[rbtnode->locknum].lock;
|
|
NODE_LOCK(nodelock, isc_rwlocktype_write);
|
|
|
|
acarray = NULL;
|
|
switch (type) {
|
|
case dns_rdatasetadditional_fromauth:
|
|
acarray = header->additional_auth;
|
|
break;
|
|
case dns_rdatasetadditional_fromglue:
|
|
acarray = header->additional_glue;
|
|
break;
|
|
default:
|
|
INSIST(0);
|
|
}
|
|
|
|
if (acarray == NULL) {
|
|
unsigned int i;
|
|
|
|
acarray = isc_mem_get(rbtdb->common.mctx, total_count *
|
|
sizeof(acachectl_t));
|
|
|
|
if (acarray == NULL) {
|
|
NODE_UNLOCK(nodelock, isc_rwlocktype_write);
|
|
goto fail;
|
|
}
|
|
|
|
for (i = 0; i < total_count; i++) {
|
|
acarray[i].entry = NULL;
|
|
acarray[i].cbarg = NULL;
|
|
}
|
|
}
|
|
switch (type) {
|
|
case dns_rdatasetadditional_fromauth:
|
|
header->additional_auth = acarray;
|
|
break;
|
|
case dns_rdatasetadditional_fromglue:
|
|
header->additional_glue = acarray;
|
|
break;
|
|
default:
|
|
INSIST(0);
|
|
}
|
|
|
|
if (acarray[count].entry != NULL) {
|
|
/*
|
|
* Swap the entry. Delay cleaning-up the old entry since
|
|
* it would require a node lock.
|
|
*/
|
|
oldentry = acarray[count].entry;
|
|
INSIST(acarray[count].cbarg != NULL);
|
|
oldcbarg = acarray[count].cbarg;
|
|
}
|
|
acarray[count].entry = newentry;
|
|
acarray[count].cbarg = newcbarg;
|
|
|
|
NODE_UNLOCK(nodelock, isc_rwlocktype_write);
|
|
|
|
if (oldentry != NULL) {
|
|
acache_cancelentry(rbtdb->common.mctx, oldentry, &oldcbarg);
|
|
dns_acache_detachentry(&oldentry);
|
|
}
|
|
|
|
return (ISC_R_SUCCESS);
|
|
|
|
fail:
|
|
if (newcbarg != NULL) {
|
|
if (newentry != NULL) {
|
|
acache_cancelentry(rbtdb->common.mctx, newentry,
|
|
&newcbarg);
|
|
dns_acache_detachentry(&newentry);
|
|
} else {
|
|
dns_db_detachnode((dns_db_t *)rbtdb, &newcbarg->node);
|
|
dns_db_detach(&newcbarg->db);
|
|
isc_mem_put(rbtdb->common.mctx, newcbarg,
|
|
sizeof(*newcbarg));
|
|
}
|
|
}
|
|
|
|
return (result);
|
|
}
|
|
|
|
static isc_result_t
|
|
rdataset_putadditional(dns_acache_t *acache, dns_rdataset_t *rdataset,
|
|
dns_rdatasetadditional_t type, dns_rdatatype_t qtype)
|
|
{
|
|
dns_rbtdb_t *rbtdb = rdataset->private1;
|
|
dns_rbtnode_t *rbtnode = rdataset->private2;
|
|
unsigned char *raw = rdataset->private3; /* RDATASLAB */
|
|
unsigned int current_count = rdataset->privateuint4;
|
|
rdatasetheader_t *header;
|
|
nodelock_t *nodelock;
|
|
unsigned int total_count, count;
|
|
acachectl_t *acarray;
|
|
dns_acacheentry_t *entry;
|
|
acache_cbarg_t *cbarg;
|
|
|
|
UNUSED(qtype); /* we do not use this value at least for now */
|
|
UNUSED(acache);
|
|
|
|
if (type == dns_rdatasetadditional_fromcache)
|
|
return (ISC_R_SUCCESS);
|
|
|
|
header = (struct rdatasetheader *)(raw - sizeof(*header));
|
|
|
|
total_count = raw[0] * 256 + raw[1];
|
|
INSIST(total_count > current_count);
|
|
count = total_count - current_count - 1;
|
|
|
|
acarray = NULL;
|
|
entry = NULL;
|
|
|
|
nodelock = &rbtdb->node_locks[rbtnode->locknum].lock;
|
|
NODE_LOCK(nodelock, isc_rwlocktype_write);
|
|
|
|
switch (type) {
|
|
case dns_rdatasetadditional_fromauth:
|
|
acarray = header->additional_auth;
|
|
break;
|
|
case dns_rdatasetadditional_fromglue:
|
|
acarray = header->additional_glue;
|
|
break;
|
|
default:
|
|
INSIST(0);
|
|
}
|
|
|
|
if (acarray == NULL) {
|
|
NODE_UNLOCK(nodelock, isc_rwlocktype_write);
|
|
return (ISC_R_NOTFOUND);
|
|
}
|
|
|
|
entry = acarray[count].entry;
|
|
if (entry == NULL) {
|
|
NODE_UNLOCK(nodelock, isc_rwlocktype_write);
|
|
return (ISC_R_NOTFOUND);
|
|
}
|
|
|
|
acarray[count].entry = NULL;
|
|
cbarg = acarray[count].cbarg;
|
|
acarray[count].cbarg = NULL;
|
|
|
|
NODE_UNLOCK(nodelock, isc_rwlocktype_write);
|
|
|
|
if (entry != NULL) {
|
|
acache_cancelentry(rbtdb->common.mctx, entry, &cbarg);
|
|
dns_acache_detachentry(&entry);
|
|
}
|
|
|
|
return (ISC_R_SUCCESS);
|
|
}
|