/*
* Copyright (C) Internet Systems Consortium, Inc. ("ISC")
*
* 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 http://mozilla.org/MPL/2.0/.
*
* See the COPYRIGHT file distributed with this work for additional
* information regarding copyright ownership.
*/
#ifndef DNS_VIEW_H
#define DNS_VIEW_H 1
/*****
***** Module Info
*****/
/*! \file dns/view.h
* \brief
* DNS View
*
* A "view" is a DNS namespace, together with an optional resolver and a
* forwarding policy. A "DNS namespace" is a (possibly empty) set of
* authoritative zones together with an optional cache and optional
* "hints" information.
*
* Views start out "unfrozen". In this state, core attributes like
* the cache, set of zones, and forwarding policy may be set. While
* "unfrozen", the caller (e.g. nameserver configuration loading
* code), must ensure exclusive access to the view. When the view is
* "frozen", the core attributes become immutable, and the view module
* will ensure synchronization. Freezing allows the view's core attributes
* to be accessed without locking.
*
* MP:
*\li Before the view is frozen, the caller must ensure synchronization.
*
*\li After the view is frozen, the module guarantees appropriate
* synchronization of any data structures it creates and manipulates.
*
* Reliability:
*\li No anticipated impact.
*
* Resources:
*\li TBS
*
* Security:
*\li No anticipated impact.
*
* Standards:
*\li None.
*/
#include <stdio.h>
#include <isc/lang.h>
#include <isc/magic.h>
#include <isc/event.h>
#include <isc/mutex.h>
#include <isc/net.h>
#include <isc/refcount.h>
#include <isc/rwlock.h>
#include <isc/stdtime.h>
#include <dns/acl.h>
#include <dns/catz.h>
#include <dns/clientinfo.h>
#include <dns/dnstap.h>
#include <dns/fixedname.h>
#include <dns/rrl.h>
#include <dns/rdatastruct.h>
#include <dns/rpz.h>
#include <dns/types.h>
#include <dns/zt.h>
ISC_LANG_BEGINDECLS
struct dns_view {
/* Unlocked. */
unsigned int magic;
isc_mem_t * mctx;
dns_rdataclass_t rdclass;
char * name;
dns_zt_t * zonetable;
dns_resolver_t * resolver;
dns_adb_t * adb;
dns_requestmgr_t * requestmgr;
dns_acache_t * acache;
dns_cache_t * cache;
dns_db_t * cachedb;
dns_db_t * hints;
/*
* security roots and negative trust anchors.
* internal use only; access via * dns_view_getsecroots()
*/
dns_keytable_t * secroots_priv;
dns_ntatable_t * ntatable_priv;
isc_mutex_t lock;
isc_boolean_t frozen;
isc_task_t * task;
isc_event_t resevent;
isc_event_t adbevent;
isc_event_t reqevent;
isc_stats_t * adbstats;
isc_stats_t * resstats;
dns_stats_t * resquerystats;
isc_boolean_t cacheshared;
/* Configurable data. */
dns_tsig_keyring_t * statickeys;
dns_tsig_keyring_t * dynamickeys;
dns_peerlist_t * peers;
dns_order_t * order;
dns_fwdtable_t * fwdtable;
isc_boolean_t recursion;
isc_boolean_t auth_nxdomain;
isc_boolean_t additionalfromcache;
isc_boolean_t additionalfromauth;
isc_boolean_t minimal_any;
dns_minimaltype_t minimalresponses;
isc_boolean_t enablednssec;
isc_boolean_t enablevalidation;
isc_boolean_t acceptexpired;
isc_boolean_t requireservercookie;
isc_boolean_t trust_anchor_telemetry;
isc_boolean_t root_key_sentinel;
dns_transfer_format_t transfer_format;
dns_acl_t * cacheacl;
dns_acl_t * cacheonacl;
dns_acl_t * queryacl;
dns_acl_t * queryonacl;
dns_acl_t * recursionacl;
dns_acl_t * recursiononacl;
dns_acl_t * sortlist;
dns_acl_t * notifyacl;
dns_acl_t * transferacl;
dns_acl_t * updateacl;
dns_acl_t * upfwdacl;
dns_acl_t * denyansweracl;
dns_acl_t * nocasecompress;
isc_boolean_t msgcompression;
dns_rbt_t * answeracl_exclude;
dns_rbt_t * denyanswernames;
dns_rbt_t * answernames_exclude;
dns_rrl_t * rrl;
isc_boolean_t provideixfr;
isc_boolean_t requestnsid;
isc_boolean_t sendcookie;
dns_ttl_t maxcachettl;
dns_ttl_t maxncachettl;
isc_uint32_t nta_lifetime;
isc_uint32_t nta_recheck;
char *nta_file;
dns_ttl_t prefetch_trigger;
dns_ttl_t prefetch_eligible;
in_port_t dstport;
dns_aclenv_t aclenv;
dns_rdatatype_t preferred_glue;
isc_boolean_t flush;
dns_namelist_t * delonly;
isc_boolean_t rootdelonly;
dns_namelist_t * rootexclude;
isc_boolean_t checknames;
dns_name_t * dlv;
dns_fixedname_t dlv_fixed;
isc_uint16_t maxudp;
isc_uint16_t nocookieudp;
unsigned int maxbits;
dns_aaaa_t v4_aaaa;
dns_aaaa_t v6_aaaa;
dns_acl_t * aaaa_acl;
dns_dns64list_t dns64;
unsigned int dns64cnt;
dns_rpz_zones_t *rpzs;
dns_catz_zones_t *catzs;
dns_dlzdblist_t dlz_searched;
dns_dlzdblist_t dlz_unsearched;
isc_uint32_t fail_ttl;
dns_badcache_t *failcache;
/*
* Configurable data for server use only,
* locked by server configuration lock.
*/
dns_acl_t * matchclients;
dns_acl_t * matchdestinations;
isc_boolean_t matchrecursiveonly;
/* Locked by themselves. */
isc_refcount_t references;
isc_refcount_t weakrefs;
/* Locked by lock. */
unsigned int attributes;
/* Under owner's locking control. */
ISC_LINK(struct dns_view) link;
dns_viewlist_t * viewlist;
dns_zone_t * managed_keys;
dns_zone_t * redirect;
dns_name_t * redirectzone; /* points to
* redirectfixed
* when valid */
dns_fixedname_t redirectfixed;
/*
* File and configuration data for zones added at runtime
* (only used in BIND9).
*
* XXX: This should be a pointer to an opaque type that
* named implements.
*/
char * new_zone_file;
char * new_zone_db;
void * new_zone_dbenv;
isc_uint64_t new_zone_mapsize;
void * new_zone_config;
void (*cfg_destroy)(void **);
isc_mutex_t new_zone_lock;
unsigned char secret[32]; /* Client secret */
unsigned int v6bias;
dns_dtenv_t *dtenv; /* Dnstap environment */
dns_dtmsgtype_t dttypes; /* Dnstap message types
to log */
};
#define DNS_VIEW_MAGIC ISC_MAGIC('V','i','e','w')
#define DNS_VIEW_VALID(view) ISC_MAGIC_VALID(view, DNS_VIEW_MAGIC)
#define DNS_VIEWATTR_RESSHUTDOWN 0x01
#define DNS_VIEWATTR_ADBSHUTDOWN 0x02
#define DNS_VIEWATTR_REQSHUTDOWN 0x04
#ifdef HAVE_LMDB
#include <lmdb.h>
/*
* MDB_NOTLS is used to prevent problems after configuration is reloaded, due
* to the way LMDB's use of thread-local storage (TLS) interacts with the BIND9
* thread model.
*/
#define DNS_LMDB_COMMON_FLAGS (MDB_CREATE | MDB_NOSUBDIR | MDB_NOTLS)
#ifndef __OpenBSD__
#define DNS_LMDB_FLAGS (DNS_LMDB_COMMON_FLAGS)
#else /* __OpenBSD__ */
/*
* OpenBSD does not have a unified buffer cache, which requires both reads and
* writes to be performed using mmap().
*/
#define DNS_LMDB_FLAGS (DNS_LMDB_COMMON_FLAGS | MDB_WRITEMAP)
#endif /* __OpenBSD__ */
#endif /* HAVE_LMDB */
isc_result_t
dns_view_create(isc_mem_t *mctx, dns_rdataclass_t rdclass,
const char *name, dns_view_t **viewp);
/*%<
* Create a view.
*
* Notes:
*
*\li The newly created view has no cache, no resolver, and an empty
* zone table. The view is not frozen.
*
* Requires:
*
*\li 'mctx' is a valid memory context.
*
*\li 'rdclass' is a valid class.
*
*\li 'name' is a valid C string.
*
*\li viewp != NULL && *viewp == NULL
*
* Returns:
*
*\li #ISC_R_SUCCESS
*\li #ISC_R_NOMEMORY
*
*\li Other errors are possible.
*/
void
dns_view_attach(dns_view_t *source, dns_view_t **targetp);
/*%<
* Attach '*targetp' to 'source'.
*
* Requires:
*
*\li 'source' is a valid, frozen view.
*
*\li 'targetp' points to a NULL dns_view_t *.
*
* Ensures:
*
*\li *targetp is attached to source.
*
*\li While *targetp is attached, the view will not shut down.
*/
void
dns_view_detach(dns_view_t **viewp);
/*%<
* Detach '*viewp' from its view.
*
* Requires:
*
*\li 'viewp' points to a valid dns_view_t *
*
* Ensures:
*
*\li *viewp is NULL.
*/
void
dns_view_flushanddetach(dns_view_t **viewp);
/*%<
* Detach '*viewp' from its view. If this was the last reference
* uncommitted changed in zones will be flushed to disk.
*
* Requires:
*
*\li 'viewp' points to a valid dns_view_t *
*
* Ensures:
*
*\li *viewp is NULL.
*/
void
dns_view_weakattach(dns_view_t *source, dns_view_t **targetp);
/*%<
* Weakly attach '*targetp' to 'source'.
*
* Requires:
*
*\li 'source' is a valid, frozen view.
*
*\li 'targetp' points to a NULL dns_view_t *.
*
* Ensures:
*
*\li *targetp is attached to source.
*
* \li While *targetp is attached, the view will not be freed.
*/
void
dns_view_weakdetach(dns_view_t **targetp);
/*%<
* Detach '*viewp' from its view.
*
* Requires:
*
*\li 'viewp' points to a valid dns_view_t *.
*
* Ensures:
*
*\li *viewp is NULL.
*/
isc_result_t
dns_view_createzonetable(dns_view_t *view);
/*%<
* Create a zonetable for the view.
*
* Requires:
*
*\li 'view' is a valid, unfrozen view.
*
*\li 'view' does not have a zonetable already.
*
* Returns:
*
*\li #ISC_R_SUCCESS
*
*\li Any error that dns_zt_create() can return.
*/
isc_result_t
dns_view_createresolver(dns_view_t *view,
isc_taskmgr_t *taskmgr,
unsigned int ntasks, unsigned int ndisp,
isc_socketmgr_t *socketmgr,
isc_timermgr_t *timermgr,
unsigned int options,
dns_dispatchmgr_t *dispatchmgr,
dns_dispatch_t *dispatchv4,
dns_dispatch_t *dispatchv6);
/*%<
* Create a resolver and address database for the view.
*
* Requires:
*
*\li 'view' is a valid, unfrozen view.
*
*\li 'view' does not have a resolver already.
*
*\li The requirements of dns_resolver_create() apply to 'taskmgr',
* 'ntasks', 'socketmgr', 'timermgr', 'options', 'dispatchv4', and
* 'dispatchv6'.
*
* Returns:
*
*\li #ISC_R_SUCCESS
*
*\li Any error that dns_resolver_create() can return.
*/
void
dns_view_setcache(dns_view_t *view, dns_cache_t *cache);
void
dns_view_setcache2(dns_view_t *view, dns_cache_t *cache, isc_boolean_t shared);
/*%<
* Set the view's cache database. If 'shared' is true, this means the cache
* is created by another view and is shared with that view. dns_view_setcache()
* is a backward compatible version equivalent to setcache2(..., ISC_FALSE).
*
* Requires:
*
*\li 'view' is a valid, unfrozen view.
*
*\li 'cache' is a valid cache.
*
* Ensures:
*
* \li The cache of 'view' is 'cached.
*
*\li If this is not the first call to dns_view_setcache() for this
* view, then previously set cache is detached.
*/
void
dns_view_sethints(dns_view_t *view, dns_db_t *hints);
/*%<
* Set the view's hints database.
*
* Requires:
*
*\li 'view' is a valid, unfrozen view, whose hints database has not been
* set.
*
*\li 'hints' is a valid zone database.
*
* Ensures:
*
* \li The hints database of 'view' is 'hints'.
*/
void
dns_view_setkeyring(dns_view_t *view, dns_tsig_keyring_t *ring);
void
dns_view_setdynamickeyring(dns_view_t *view, dns_tsig_keyring_t *ring);
/*%<
* Set the view's static TSIG keys
*
* Requires:
*
* \li 'view' is a valid, unfrozen view, whose static TSIG keyring has not
* been set.
*
*\li 'ring' is a valid TSIG keyring
*
* Ensures:
*
*\li The static TSIG keyring of 'view' is 'ring'.
*/
void
dns_view_getdynamickeyring(dns_view_t *view, dns_tsig_keyring_t **ringp);
/*%<
* Return the views dynamic keys.
*
* \li 'view' is a valid, unfrozen view.
* \li 'ringp' != NULL && ringp == NULL.
*/
void
dns_view_setdstport(dns_view_t *view, in_port_t dstport);
/*%<
* Set the view's destination port. This is the port to
* which outgoing queries are sent. The default is 53,
* the standard DNS port.
*
* Requires:
*
*\li 'view' is a valid view.
*
*\li 'dstport' is a valid TCP/UDP port number.
*
* Ensures:
*\li External name servers will be assumed to be listening
* on 'dstport'. For servers whose address has already
* obtained obtained at the time of the call, the view may
* continue to use the previously set port until the address
* times out from the view's address database.
*/
isc_result_t
dns_view_addzone(dns_view_t *view, dns_zone_t *zone);
/*%<
* Add zone 'zone' to 'view'.
*
* Requires:
*
*\li 'view' is a valid, unfrozen view.
*
*\li 'zone' is a valid zone.
*/
void
dns_view_freeze(dns_view_t *view);
/*%<
* Freeze view. No changes can be made to view configuration while frozen.
*
* Requires:
*
*\li 'view' is a valid, unfrozen view.
*
* Ensures:
*
*\li 'view' is frozen.
*/
void
dns_view_thaw(dns_view_t *view);
/*%<
* Thaw view. This allows zones to be added or removed at runtime. This is
* NOT thread-safe; the caller MUST have run isc_task_exclusive() prior to
* thawing the view.
*
* Requires:
*
*\li 'view' is a valid, frozen view.
*
* Ensures:
*
*\li 'view' is no longer frozen.
*/
isc_result_t
dns_view_find(dns_view_t *view, dns_name_t *name, dns_rdatatype_t type,
isc_stdtime_t now, unsigned int options, isc_boolean_t use_hints,
dns_db_t **dbp, dns_dbnode_t **nodep, dns_name_t *foundname,
dns_rdataset_t *rdataset, dns_rdataset_t *sigrdataset);
isc_result_t
dns_view_find2(dns_view_t *view, dns_name_t *name, dns_rdatatype_t type,
isc_stdtime_t now, unsigned int options,
isc_boolean_t use_hints, isc_boolean_t use_static_stub,
dns_db_t **dbp, dns_dbnode_t **nodep, dns_name_t *foundname,
dns_rdataset_t *rdataset, dns_rdataset_t *sigrdataset);
/*%<
* Find an rdataset whose owner name is 'name', and whose type is
* 'type'.
* In general, this function first searches view's zone and cache DBs for the
* best match data against 'name'. If nothing found there, and if 'use_hints'
* is ISC_TRUE, the view's hint DB (if configured) is searched.
* If the view is configured with a static-stub zone which gives the longest
* match for 'name' among the zones, however, the cache DB is not consulted
* unless 'use_static_stub' is ISC_FALSE (see below about this argument).
*
* dns_view_find() is a backward compatible version equivalent to
* dns_view_find2() with use_static_stub argument being ISC_FALSE.
*
* Notes:
*
*\li See the description of dns_db_find() for information about 'options'.
* If the caller sets #DNS_DBFIND_GLUEOK, it must ensure that 'name'
* and 'type' are appropriate for glue retrieval.
*
*\li If 'now' is zero, then the current time will be used.
*
*\li If 'use_hints' is ISC_TRUE, and the view has a hints database, then
* it will be searched last. If the answer is found in the hints
* database, the result code will be DNS_R_HINT. If the name is found
* in the hints database but not the type, the result code will be
* #DNS_R_HINTNXRRSET.
*
*\li If 'use_static_stub' is ISC_FALSE and the longest match zone for 'name'
* is a static-stub zone, it's ignored and the cache and/or hints will be
* searched. In the majority of the cases this argument should be
* ISC_FALSE. The only known usage of this argument being ISC_TRUE is
* if this search is for a "bailiwick" glue A or AAAA RRset that may
* best match a static-stub zone. Consider the following example:
* this view is configured with a static-stub zone "example.com",
* and an attempt of recursive resolution needs to send a query for the
* zone. In this case it's quite likely that the resolver is trying to
* find A/AAAA RRs for the apex name "example.com". And, to honor the
* static-stub configuration it needs to return the glue RRs in the
* static-stub zone even if that exact RRs coming from the authoritative
* zone has been cached.
* In other general cases, the requested data is better to be
* authoritative, either locally configured or retrieved from an external
* server, and the data in the static-stub zone should better be ignored.
*
*\li 'foundname' must meet the requirements of dns_db_find().
*
*\li If 'sigrdataset' is not NULL, and there is a SIG rdataset which
* covers 'type', then 'sigrdataset' will be bound to it.
*
* Requires:
*
*\li 'view' is a valid, frozen view.
*
*\li 'name' is valid name.
*
*\li 'type' is a valid dns_rdatatype_t, and is not a meta query type
* except dns_rdatatype_any.
*
*\li dbp == NULL || *dbp == NULL
*
*\li nodep == NULL || *nodep == NULL. If nodep != NULL, dbp != NULL.
*
*\li 'foundname' is a valid name with a dedicated buffer or NULL.
*
*\li 'rdataset' is a valid, disassociated rdataset.
*
*\li 'sigrdataset' is NULL, or is a valid, disassociated rdataset.
*
* Ensures:
*
*\li In successful cases, 'rdataset', and possibly 'sigrdataset', are
* bound to the found data.
*
*\li If dbp != NULL, it points to the database containing the data.
*
*\li If nodep != NULL, it points to the database node containing the data.
*
*\li If foundname != NULL, it contains the full name of the found data.
*
* Returns:
*
*\li Any result that dns_db_find() can return, with the exception of
* #DNS_R_DELEGATION.
*/
isc_result_t
dns_view_simplefind(dns_view_t *view, dns_name_t *name, dns_rdatatype_t type,
isc_stdtime_t now, unsigned int options,
isc_boolean_t use_hints,
dns_rdataset_t *rdataset, dns_rdataset_t *sigrdataset);
/*%<
* Find an rdataset whose owner name is 'name', and whose type is
* 'type'.
*
* Notes:
*
*\li This routine is appropriate for simple, exact-match queries of the
* view. 'name' must be a canonical name; there is no DNAME or CNAME
* processing.
*
*\li See the description of dns_db_find() for information about 'options'.
* If the caller sets DNS_DBFIND_GLUEOK, it must ensure that 'name'
* and 'type' are appropriate for glue retrieval.
*
*\li If 'now' is zero, then the current time will be used.
*
*\li If 'use_hints' is ISC_TRUE, and the view has a hints database, then
* it will be searched last. If the answer is found in the hints
* database, the result code will be DNS_R_HINT. If the name is found
* in the hints database but not the type, the result code will be
* DNS_R_HINTNXRRSET.
*
*\li If 'sigrdataset' is not NULL, and there is a SIG rdataset which
* covers 'type', then 'sigrdataset' will be bound to it.
*
* Requires:
*
*\li 'view' is a valid, frozen view.
*
*\li 'name' is valid name.
*
*\li 'type' is a valid dns_rdatatype_t, and is not a meta query type
* (e.g. dns_rdatatype_any), or dns_rdatatype_rrsig.
*
*\li 'rdataset' is a valid, disassociated rdataset.
*
*\li 'sigrdataset' is NULL, or is a valid, disassociated rdataset.
*
* Ensures:
*
*\li In successful cases, 'rdataset', and possibly 'sigrdataset', are
* bound to the found data.
*
* Returns:
*
*\li #ISC_R_SUCCESS Success; result is desired type.
*\li DNS_R_GLUE Success; result is glue.
*\li DNS_R_HINT Success; result is a hint.
*\li DNS_R_NCACHENXDOMAIN Success; result is a ncache entry.
*\li DNS_R_NCACHENXRRSET Success; result is a ncache entry.
*\li DNS_R_NXDOMAIN The name does not exist.
*\li DNS_R_NXRRSET The rrset does not exist.
*\li #ISC_R_NOTFOUND No matching data found,
* or an error occurred.
*/
/*% See dns_view_findzonecut2() */
isc_result_t
dns_view_findzonecut(dns_view_t *view, dns_name_t *name, dns_name_t *fname,
isc_stdtime_t now, unsigned int options,
isc_boolean_t use_hints,
dns_rdataset_t *rdataset, dns_rdataset_t *sigrdataset);
isc_result_t
dns_view_findzonecut2(dns_view_t *view, dns_name_t *name, dns_name_t *fname,
isc_stdtime_t now, unsigned int options,
isc_boolean_t use_hints, isc_boolean_t use_cache,
dns_rdataset_t *rdataset, dns_rdataset_t *sigrdataset);
/*%<
* Find the best known zonecut containing 'name'.
*
* This uses local authority, cache, and optionally hints data.
* No external queries are performed.
*
* Notes:
*
*\li If 'now' is zero, then the current time will be used.
*
*\li If 'use_hints' is ISC_TRUE, and the view has a hints database, then
* it will be searched last.
*
*\li If 'use_cache' is ISC_TRUE, and the view has a cache, then it will be
* searched.
*
*\li If 'sigrdataset' is not NULL, and there is a SIG rdataset which
* covers 'type', then 'sigrdataset' will be bound to it.
*
*\li If the DNS_DBFIND_NOEXACT option is set, then the zonecut returned
* (if any) will be the deepest known ancestor of 'name'.
*
* Requires:
*
*\li 'view' is a valid, frozen view.
*
*\li 'name' is valid name.
*
*\li 'rdataset' is a valid, disassociated rdataset.
*
*\li 'sigrdataset' is NULL, or is a valid, disassociated rdataset.
*
* Returns:
*
*\li #ISC_R_SUCCESS Success.
*
*\li Many other results are possible.
*/
isc_result_t
dns_viewlist_find(dns_viewlist_t *list, const char *name,
dns_rdataclass_t rdclass, dns_view_t **viewp);
/*%<
* Search for a view with name 'name' and class 'rdclass' in 'list'.
* If found, '*viewp' is (strongly) attached to it.
*
* Requires:
*
*\li 'viewp' points to a NULL dns_view_t *.
*
* Returns:
*
*\li #ISC_R_SUCCESS A matching view was found.
*\li #ISC_R_NOTFOUND No matching view was found.
*/
isc_result_t
dns_viewlist_findzone(dns_viewlist_t *list, dns_name_t *name, isc_boolean_t allclasses,
dns_rdataclass_t rdclass, dns_zone_t **zonep);
/*%<
* Search zone with 'name' in view with 'rdclass' in viewlist 'list'
* If found, zone is returned in *zonep. If allclasses is set rdclass is ignored
*
* Returns:
*\li #ISC_R_SUCCESS A matching zone was found.
*\li #ISC_R_NOTFOUND No matching zone was found.
*\li #ISC_R_MULTIPLE Multiple zones with the same name were found.
*/
isc_result_t
dns_view_findzone(dns_view_t *view, dns_name_t *name, dns_zone_t **zonep);
/*%<
* Search for the zone 'name' in the zone table of 'view'.
* If found, 'zonep' is (strongly) attached to it. There
* are no partial matches.
*
* Requires:
*
*\li 'zonep' points to a NULL dns_zone_t *.
*
* Returns:
*\li #ISC_R_SUCCESS A matching zone was found.
*\li #ISC_R_NOTFOUND No matching zone was found.
*\li others An error occurred.
*/
isc_result_t
dns_view_load(dns_view_t *view, isc_boolean_t stop);
isc_result_t
dns_view_loadnew(dns_view_t *view, isc_boolean_t stop);
isc_result_t
dns_view_asyncload(dns_view_t *view, dns_zt_allloaded_t callback, void *arg);
/*%<
* Load zones attached to this view. dns_view_load() loads
* all zones whose master file has changed since the last
* load; dns_view_loadnew() loads only zones that have never
* been loaded.
*
* dns_view_asyncload() loads zones asynchronously. When all zones
* in the view have finished loading, 'callback' is called with argument
* 'arg' to inform the caller.
*
* If 'stop' is ISC_TRUE, stop on the first error and return it.
* If 'stop' is ISC_FALSE (or we are loading asynchronously), ignore errors.
*
* Requires:
*
*\li 'view' is valid.
*/
isc_result_t
dns_view_gettsig(dns_view_t *view, dns_name_t *keyname,
dns_tsigkey_t **keyp);
/*%<
* Find the TSIG key configured in 'view' with name 'keyname',
* if any.
*
* Requires:
*\li keyp points to a NULL dns_tsigkey_t *.
*
* Returns:
*\li #ISC_R_SUCCESS A key was found and '*keyp' now points to it.
*\li #ISC_R_NOTFOUND No key was found.
*\li others An error occurred.
*/
isc_result_t
dns_view_getpeertsig(dns_view_t *view, isc_netaddr_t *peeraddr,
dns_tsigkey_t **keyp);
/*%<
* Find the TSIG key configured in 'view' for the server whose
* address is 'peeraddr', if any.
*
* Requires:
* keyp points to a NULL dns_tsigkey_t *.
*
* Returns:
*\li #ISC_R_SUCCESS A key was found and '*keyp' now points to it.
*\li #ISC_R_NOTFOUND No key was found.
*\li others An error occurred.
*/
isc_result_t
dns_view_checksig(dns_view_t *view, isc_buffer_t *source, dns_message_t *msg);
/*%<
* Verifies the signature of a message.
*
* Requires:
*
*\li 'view' is a valid view.
*\li 'source' is a valid buffer containing the message
*\li 'msg' is a valid message
*
* Returns:
*\li see dns_tsig_verify()
*/
void
dns_view_dialup(dns_view_t *view);
/*%<
* Perform dialup-time maintenance on the zones of 'view'.
*/
isc_result_t
dns_view_dumpdbtostream(dns_view_t *view, FILE *fp);
/*%<
* Dump the current state of the view 'view' to the stream 'fp'
* for purposes of analysis or debugging.
*
* Currently the dumped state includes the view's cache; in the future
* it may also include other state such as the address database.
* It will not not include authoritative data since it is voluminous and
* easily obtainable by other means.
*
* Requires:
*
*\li 'view' is valid.
*
*\li 'fp' refers to a file open for writing.
*
* Returns:
* \li ISC_R_SUCCESS The cache was successfully dumped.
* \li others An error occurred (see dns_master_dump)
*/
isc_result_t
dns_view_flushcache(dns_view_t *view);
isc_result_t
dns_view_flushcache2(dns_view_t *view, isc_boolean_t fixuponly);
/*%<
* Flush the view's cache (and ADB). If 'fixuponly' is true, it only updates
* the internal reference to the cache DB with omitting actual flush operation.
* 'fixuponly' is intended to be used for a view that shares a cache with
* a different view. dns_view_flushcache() is a backward compatible version
* that always sets fixuponly to false.
*
* Requires:
* 'view' is valid.
*
* No other tasks are executing.
*
* Returns:
*\li #ISC_R_SUCCESS
*\li #ISC_R_NOMEMORY
*/
isc_result_t
dns_view_flushnode(dns_view_t *view, dns_name_t *name, isc_boolean_t tree);
/*%<
* Flush the given name from the view's cache (and optionally ADB/badcache).
*
* Flush the given name from the cache, ADB, and bad cache. If 'tree'
* is true, also flush all subdomains of 'name'.
*
* Requires:
*\li 'view' is valid.
*\li 'name' is valid.
*
* Returns:
*\li #ISC_R_SUCCESS
* other returns are failures.
*/
isc_result_t
dns_view_flushname(dns_view_t *view, dns_name_t *name);
/*%<
* Flush the given name from the view's cache, ADB and badcache.
* Equivalent to dns_view_flushnode(view, name, ISC_FALSE).
*
*
* Requires:
*\li 'view' is valid.
*\li 'name' is valid.
*
* Returns:
*\li #ISC_R_SUCCESS
* other returns are failures.
*/
isc_result_t
dns_view_adddelegationonly(dns_view_t *view, dns_name_t *name);
/*%<
* Add the given name to the delegation only table.
*
* Requires:
*\li 'view' is valid.
*\li 'name' is valid.
*
* Returns:
*\li #ISC_R_SUCCESS
*\li #ISC_R_NOMEMORY
*/
isc_result_t
dns_view_excludedelegationonly(dns_view_t *view, dns_name_t *name);
/*%<
* Add the given name to be excluded from the root-delegation-only.
*
*
* Requires:
*\li 'view' is valid.
*\li 'name' is valid.
*
* Returns:
*\li #ISC_R_SUCCESS
*\li #ISC_R_NOMEMORY
*/
isc_boolean_t
dns_view_isdelegationonly(dns_view_t *view, dns_name_t *name);
/*%<
* Check if 'name' is in the delegation only table or if
* rootdelonly is set that name is not being excluded.
*
* Requires:
*\li 'view' is valid.
*\li 'name' is valid.
*
* Returns:
*\li #ISC_TRUE if the name is the table.
*\li #ISC_FALSE otherwise.
*/
void
dns_view_setrootdelonly(dns_view_t *view, isc_boolean_t value);
/*%<
* Set the root delegation only flag.
*
* Requires:
*\li 'view' is valid.
*/
isc_boolean_t
dns_view_getrootdelonly(dns_view_t *view);
/*%<
* Get the root delegation only flag.
*
* Requires:
*\li 'view' is valid.
*/
isc_result_t
dns_view_freezezones(dns_view_t *view, isc_boolean_t freeze);
/*%<
* Freeze/thaw updates to master zones.
*
* Requires:
* \li 'view' is valid.
*/
void
dns_view_setadbstats(dns_view_t *view, isc_stats_t *stats);
/*%<
* Set a adb statistics set 'stats' for 'view'.
*
* Requires:
* \li 'view' is valid and is not frozen.
*
*\li stats is a valid statistics supporting adb statistics
* (see dns/stats.h).
*/
void
dns_view_getadbstats(dns_view_t *view, isc_stats_t **statsp);
/*%<
* Get the adb statistics counter set for 'view'. If a statistics set is
* set '*statsp' will be attached to the set; otherwise, '*statsp' will be
* untouched.
*
* Requires:
* \li 'view' is valid and is not frozen.
*
*\li 'statsp' != NULL && '*statsp' != NULL
*/
void
dns_view_setresstats(dns_view_t *view, isc_stats_t *stats);
/*%<
* Set a general resolver statistics counter set 'stats' for 'view'.
*
* Requires:
* \li 'view' is valid and is not frozen.
*
*\li stats is a valid statistics supporting resolver statistics counters
* (see dns/stats.h).
*/
void
dns_view_getresstats(dns_view_t *view, isc_stats_t **statsp);
/*%<
* Get the general statistics counter set for 'view'. If a statistics set is
* set '*statsp' will be attached to the set; otherwise, '*statsp' will be
* untouched.
*
* Requires:
* \li 'view' is valid and is not frozen.
*
*\li 'statsp' != NULL && '*statsp' != NULL
*/
void
dns_view_setresquerystats(dns_view_t *view, dns_stats_t *stats);
/*%<
* Set a statistics counter set of rdata type, 'stats', for 'view'. Once the
* statistic set is installed, view's resolver will count outgoing queries
* per rdata type.
*
* Requires:
* \li 'view' is valid and is not frozen.
*
*\li stats is a valid statistics created by dns_rdatatypestats_create().
*/
void
dns_view_getresquerystats(dns_view_t *view, dns_stats_t **statsp);
/*%<
* Get the rdatatype statistics counter set for 'view'. If a statistics set is
* set '*statsp' will be attached to the set; otherwise, '*statsp' will be
* untouched.
*
* Requires:
* \li 'view' is valid and is not frozen.
*
*\li 'statsp' != NULL && '*statsp' != NULL
*/
isc_boolean_t
dns_view_iscacheshared(dns_view_t *view);
/*%<
* Check if the view shares the cache created by another view.
*
* Requires:
* \li 'view' is valid.
*
* Returns:
*\li #ISC_TRUE if the cache is shared.
*\li #ISC_FALSE otherwise.
*/
isc_result_t
dns_view_initntatable(dns_view_t *view,
isc_taskmgr_t *taskmgr, isc_timermgr_t *timermgr);
/*%<
* Initialize the negative trust anchor table for the view.
*
* Requires:
* \li 'view' is valid.
*
* Returns:
*\li ISC_R_SUCCESS
*\li Any other result indicates failure
*/
isc_result_t
dns_view_getntatable(dns_view_t *view, dns_ntatable_t **ntp);
/*%<
* Get the negative trust anchor table for this view. Returns
* ISC_R_NOTFOUND if the table not been initialized for the view.
*
* '*ntp' is attached on success; the caller is responsible for
* detaching it with dns_ntatable_detach().
*
* Requires:
* \li 'view' is valid.
* \li 'nta' is not NULL and '*nta' is NULL.
*
* Returns:
*\li ISC_R_SUCCESS
*\li ISC_R_NOTFOUND
*/
isc_result_t
dns_view_initsecroots(dns_view_t *view, isc_mem_t *mctx);
/*%<
* Initialize security roots for the view, detaching any previously
* existing security roots first. (Note that secroots_priv is
* NULL until this function is called, so any function using
* security roots must check that they have been initialized first.
* One way to do this is use dns_view_getsecroots() and check its
* return value.)
*
* Requires:
* \li 'view' is valid.
*
* Returns:
*\li ISC_R_SUCCESS
*\li Any other result indicates failure
*/
isc_result_t
dns_view_getsecroots(dns_view_t *view, dns_keytable_t **ktp);
/*%<
* Get the security roots for this view. Returns ISC_R_NOTFOUND if
* the security roots keytable has not been initialized for the view.
*
* '*ktp' is attached on success; the caller is responsible for
* detaching it with dns_keytable_detach().
*
* Requires:
* \li 'view' is valid.
* \li 'ktp' is not NULL and '*ktp' is NULL.
*
* Returns:
*\li ISC_R_SUCCESS
*\li ISC_R_NOTFOUND
*/
isc_result_t
dns_view_issecuredomain(dns_view_t *view, dns_name_t *name,
isc_stdtime_t now, isc_boolean_t checknta,
isc_boolean_t *secure_domain);
/*%<
* Is 'name' at or beneath a trusted key, and not covered by a valid
* negative trust anchor? Put answer in '*secure_domain'.
*
* If 'checknta' is ISC_FALSE, ignore the NTA table in determining
* whether this is a secure domain.
*
* Requires:
* \li 'view' is valid.
*
* Returns:
*\li ISC_R_SUCCESS
*\li Any other value indicates failure
*/
isc_boolean_t
dns_view_ntacovers(dns_view_t *view, isc_stdtime_t now,
dns_name_t *name, dns_name_t *anchor);
/*%<
* Is there a current negative trust anchor above 'name' and below 'anchor'?
*
* Requires:
* \li 'view' is valid.
*
* Returns:
*\li ISC_R_TRUE
*\li ISC_R_FALSE
*/
void
dns_view_untrust(dns_view_t *view, dns_name_t *keyname,
dns_rdata_dnskey_t *dnskey, isc_mem_t *mctx);
/*%<
* Remove keys that match 'keyname' and 'dnskey' from the views trust
* anchors.
*
* (NOTE: If the configuration specifies that there should be a
* trust anchor at 'keyname', but no keys are left after this
* operation, that is an error. We fail closed, inserting a NULL
* key so as to prevent validation until a legimitate key has been
* provided.)
*
* Requires:
* \li 'view' is valid.
* \li 'keyname' is valid.
* \li 'mctx' is valid.
* \li 'dnskey' is valid.
*/
isc_result_t
dns_view_setnewzones(dns_view_t *view, isc_boolean_t allow, void *cfgctx,
void (*cfg_destroy)(void **), isc_uint64_t mapsize);
/*%<
* Set whether or not to allow zones to be created or deleted at runtime.
*
* If 'allow' is ISC_TRUE, determines the filename into which new zone
* configuration will be written. Preserves the configuration context
* (a pointer to which is passed in 'cfgctx') for use when parsing new
* zone configuration. 'cfg_destroy' points to a callback routine to
* destroy the configuration context when the view is destroyed. (This
* roundabout method is used in order to avoid libdns having a dependency
* on libisccfg and libbind9.)
*
* If 'allow' is ISC_FALSE, removes any existing references to
* configuration context and frees any memory.
*
* Requires:
* \li 'view' is valid.
*
* Returns:
* \li ISC_R_SUCCESS
* \li ISC_R_NOSPACE
*/
void
dns_view_restorekeyring(dns_view_t *view);
isc_result_t
dns_view_searchdlz(dns_view_t *view, dns_name_t *name,
unsigned int minlabels,
dns_clientinfomethods_t *methods,
dns_clientinfo_t *clientinfo,
dns_db_t **dbp);
/*%<
* Search through the DLZ database(s) in view->dlz_searched to find
* one that can answer a query for 'name', using the DLZ driver's
* findzone method. If successful, '*dbp' is set to point to the
* DLZ database.
*
* Returns:
* \li ISC_R_SUCCESS
* \li ISC_R_NOTFOUND
*
* Requires:
* \li 'view' is valid.
* \li 'name' is not NULL.
* \li 'dbp' is not NULL and *dbp is NULL.
*/
isc_uint32_t
dns_view_getfailttl(dns_view_t *view);
/*%<
* Get the view's servfail-ttl. zero => no servfail caching.
*
* Requires:
*\li 'view' to be valid.
*/
void
dns_view_setfailttl(dns_view_t *view, isc_uint32_t failttl);
/*%<
* Set the view's servfail-ttl. zero => no servfail caching.
*
* Requires:
*\li 'view' to be valid.
*/
isc_result_t
dns_view_saventa(dns_view_t *view);
/*%<
* Save NTA for names in this view to a file.
*
* Requires:
*\li 'view' to be valid.
*/
isc_result_t
dns_view_loadnta(dns_view_t *view);
/*%<
* Loads NTA for names in this view from a file.
*
* Requires:
*\li 'view' to be valid.
*/
void
dns_view_setviewcommit(dns_view_t *view);
/*%<
* Commit dns_zone_setview() calls previously made for all zones in this
* view.
*
* Requires:
*\li 'view' to be valid.
*/
void
dns_view_setviewrevert(dns_view_t *view);
/*%<
* Revert dns_zone_setview() calls previously made for all zones in this
* view.
*
* Requires:
*\li 'view' to be valid.
*/
ISC_LANG_ENDDECLS
#endif /* DNS_VIEW_H */