/src/bind9/lib/dns/db_p.h

Source
/*
 * Copyright (C) Internet Systems Consortium, Inc. ("ISC")
 *
 * SPDX-License-Identifier: MPL-2.0
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, you can obtain one at https://mozilla.org/MPL/2.0/.
 *
 * See the COPYRIGHT file distributed with this work for additional
 * information regarding copyright ownership.
 */

#pragma once

#include <isc/heap.h>
#include <isc/urcu.h>

#include <dns/nsec3.h>
#include <dns/types.h>

#ifdef STRONG_RWLOCK_CHECK
#define STRONG_RWLOCK_CHECK(cond) REQUIRE(cond)
#else
#define STRONG_RWLOCK_CHECK(cond)
#endif

#define NODE_INITLOCK(l)    isc_rwlock_init((l))
#define NODE_DESTROYLOCK(l) isc_rwlock_destroy(l)
#define NODE_LOCK(l, t, tp)                                      \
  {                                                        \
    STRONG_RWLOCK_CHECK(*tp == isc_rwlocktype_none); \
    RWLOCK((l), (t));                                \
    *tp = t;                                         \
  }
#define NODE_UNLOCK(l, tp)                                       \
  {                                                        \
    STRONG_RWLOCK_CHECK(*tp != isc_rwlocktype_none); \
    RWUNLOCK(l, *tp);                                \
    *tp = isc_rwlocktype_none;                       \
  }
#define NODE_RDLOCK(l, tp) NODE_LOCK(l, isc_rwlocktype_read, tp);
#define NODE_WRLOCK(l, tp) NODE_LOCK(l, isc_rwlocktype_write, tp);
#define NODE_FORCEUPGRADE(l, tp)                                 \
  ({                                                       \
    STRONG_RWLOCK_CHECK(*tp == isc_rwlocktype_read); \
    isc_result_t _result = isc_rwlock_tryupgrade(l); \
    if (_result == ISC_R_SUCCESS) {                  \
      *tp = isc_rwlocktype_write;              \
    } else {                                         \
      NODE_UNLOCK(l, tp);                      \
      NODE_WRLOCK(l, tp);                      \
    };                                               \
  })

#define TREE_INITLOCK(l)    isc_rwlock_init(l)
#define TREE_DESTROYLOCK(l) isc_rwlock_destroy(l)
#define TREE_LOCK(l, t, tp)                                      \
  {                                                        \
    STRONG_RWLOCK_CHECK(*tp == isc_rwlocktype_none); \
    RWLOCK(l, t);                                    \
    *tp = t;                                         \
  }
#define TREE_UNLOCK(l, tp)                                       \
  {                                                        \
    STRONG_RWLOCK_CHECK(*tp != isc_rwlocktype_none); \
    RWUNLOCK(l, *tp);                                \
    *tp = isc_rwlocktype_none;                       \
  }
#define TREE_RDLOCK(l, tp) TREE_LOCK(l, isc_rwlocktype_read, tp);
#define TREE_WRLOCK(l, tp) TREE_LOCK(l, isc_rwlocktype_write, tp);
#define TREE_FORCEUPGRADE(l, tp)                                 \
  ({                                                       \
    STRONG_RWLOCK_CHECK(*tp == isc_rwlocktype_read); \
    isc_result_t _result = isc_rwlock_tryupgrade(l); \
    if (_result == ISC_R_SUCCESS) {                  \
      *tp = isc_rwlocktype_write;              \
    } else {                                         \
      TREE_UNLOCK(l, tp);                      \
      TREE_WRLOCK(l, tp);                      \
    };                                               \
  })

#define IS_STUB(db)  (((db)->common.attributes & DNS_DBATTR_STUB) != 0)
#define IS_CACHE(db) (((db)->common.attributes & DNS_DBATTR_CACHE) != 0)

static inline bool
prio_type(dns_typepair_t type) {
  switch (type) {
  case dns_rdatatype_soa:
  case DNS_SIGTYPEPAIR(dns_rdatatype_soa):
  case dns_rdatatype_a:
  case DNS_SIGTYPEPAIR(dns_rdatatype_a):
  case dns_rdatatype_mx:
  case DNS_SIGTYPEPAIR(dns_rdatatype_mx):
  case dns_rdatatype_aaaa:
  case DNS_SIGTYPEPAIR(dns_rdatatype_aaaa):
  case dns_rdatatype_nsec:
  case DNS_SIGTYPEPAIR(dns_rdatatype_nsec):
  case dns_rdatatype_nsec3:
  case DNS_SIGTYPEPAIR(dns_rdatatype_nsec3):
  case dns_rdatatype_ns:
  case DNS_SIGTYPEPAIR(dns_rdatatype_ns):
  case dns_rdatatype_ds:
  case DNS_SIGTYPEPAIR(dns_rdatatype_ds):
  case dns_rdatatype_cname:
  case DNS_SIGTYPEPAIR(dns_rdatatype_cname):
  case dns_rdatatype_dname:
  case DNS_SIGTYPEPAIR(dns_rdatatype_dname):
  case dns_rdatatype_svcb:
  case DNS_SIGTYPEPAIR(dns_rdatatype_svcb):
  case dns_rdatatype_https:
  case DNS_SIGTYPEPAIR(dns_rdatatype_https):
  case dns_rdatatype_dnskey:
  case DNS_SIGTYPEPAIR(dns_rdatatype_dnskey):
  case dns_rdatatype_srv:
  case DNS_SIGTYPEPAIR(dns_rdatatype_srv):
  case dns_rdatatype_txt:
  case DNS_SIGTYPEPAIR(dns_rdatatype_txt):
  case dns_rdatatype_ptr:
  case DNS_SIGTYPEPAIR(dns_rdatatype_ptr):
  case dns_rdatatype_naptr:
  case DNS_SIGTYPEPAIR(dns_rdatatype_naptr):
    return true;
  }
  return false;
}

void
dns__db_logtoomanyrecords(dns_db_t *db, const dns_name_t *name,
        dns_rdatatype_t type, const char *op, uint32_t limit);
/*
 * Emit a log message when adding an rdataset of name/type would exceed the
 * 'maxrrperset' limit. 'op' is 'adding' or 'updating' depending on whether
 * the addition is to create a new rdataset or to merge to an existing one.
 */

/*%
 * Internal dns_db constructor and destructor.
 */
void
dns__db_initialize(void);
void
dns__db_shutdown(void);

Coverage Report

Created: 2026-09-01 06:32