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bind9/lib/dns/view.c
Aram Sargsyan fc24cfd71d Fix a race issue in dns_view_addzone() 
Views use two types of reference counting - regular and weak, and
when there are no more regular references, the view_flushanddetach()
function destroys or detaches some parts of the view, including
'view->zonetable', while other parts are freed by destroy() when
the last weak reference is detached. Since catalog zones use weak
references to attach a view, it's currently possible that during
shutdown catalog zone processing will try to add a new zone into
an otherwise unused view (because it's shutting down) which doesn't
have an attached zonetable any more. This could cause an assertion
failure. Fix this issue by modifying the dns_view_addzone() function
to expect that 'view->zonetable' can be NULL, and in that case just
return ISC_R_SHUTTINGDOWN.
2025-02-17 17:21:38 +00:00

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/*
* Copyright (C) Internet Systems Consortium, Inc. ("ISC")
*
* SPDX-License-Identifier: MPL-2.0
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, you can obtain one at https://mozilla.org/MPL/2.0/.
*
* See the COPYRIGHT file distributed with this work for additional
* information regarding copyright ownership.
*/
/*! \file */
#include <inttypes.h>
#include <limits.h>
#include <stdbool.h>
#ifdef HAVE_LMDB
#include <lmdb.h>
#endif /* ifdef HAVE_LMDB */
#include <isc/atomic.h>
#include <isc/dir.h>
#include <isc/file.h>
#include <isc/hash.h>
#include <isc/lex.h>
#include <isc/print.h>
#include <isc/result.h>
#include <isc/stats.h>
#include <isc/string.h> /* Required for HP/UX (and others?) */
#include <isc/task.h>
#include <isc/util.h>
#include <dns/acl.h>
#include <dns/adb.h>
#include <dns/badcache.h>
#include <dns/cache.h>
#include <dns/db.h>
#include <dns/dispatch.h>
#include <dns/dlz.h>
#include <dns/dns64.h>
#include <dns/dnssec.h>
#include <dns/events.h>
#include <dns/forward.h>
#include <dns/keytable.h>
#include <dns/keyvalues.h>
#include <dns/master.h>
#include <dns/masterdump.h>
#include <dns/nta.h>
#include <dns/order.h>
#include <dns/peer.h>
#include <dns/rbt.h>
#include <dns/rdataset.h>
#include <dns/request.h>
#include <dns/resolver.h>
#include <dns/rpz.h>
#include <dns/rrl.h>
#include <dns/stats.h>
#include <dns/time.h>
#include <dns/transport.h>
#include <dns/tsig.h>
#include <dns/zone.h>
#include <dns/zt.h>
#define CHECK(op) \
do { \
result = (op); \
if (result != ISC_R_SUCCESS) \
goto cleanup; \
} while (0)
#define RESSHUTDOWN(v) \
((atomic_load(&(v)->attributes) & DNS_VIEWATTR_RESSHUTDOWN) != 0)
#define ADBSHUTDOWN(v) \
((atomic_load(&(v)->attributes) & DNS_VIEWATTR_ADBSHUTDOWN) != 0)
#define REQSHUTDOWN(v) \
((atomic_load(&(v)->attributes) & DNS_VIEWATTR_REQSHUTDOWN) != 0)
#define DNS_VIEW_DELONLYHASH 111
#define DNS_VIEW_FAILCACHESIZE 1021
static void
resolver_shutdown(isc_task_t *task, isc_event_t *event);
static void
adb_shutdown(isc_task_t *task, isc_event_t *event);
static void
req_shutdown(isc_task_t *task, isc_event_t *event);
/*%
* Default maximum number of chained queries before we give up
* to prevent CNAME loops.
*/
#define DEFAULT_MAX_RESTARTS 11
isc_result_t
dns_view_create(isc_mem_t *mctx, dns_rdataclass_t rdclass, const char *name,
dns_view_t **viewp) {
dns_view_t *view;
isc_result_t result;
char buffer[1024];
/*
* Create a view.
*/
REQUIRE(name != NULL);
REQUIRE(viewp != NULL && *viewp == NULL);
view = isc_mem_get(mctx, sizeof(*view));
view->nta_file = NULL;
view->mctx = NULL;
isc_mem_attach(mctx, &view->mctx);
view->name = isc_mem_strdup(mctx, name);
result = isc_file_sanitize(NULL, view->name, "nta", buffer,
sizeof(buffer));
if (result != ISC_R_SUCCESS) {
goto cleanup_name;
}
view->nta_file = isc_mem_strdup(mctx, buffer);
isc_mutex_init(&view->lock);
isc_rwlock_init(&view->sfd_lock, 0, 0);
view->zonetable = NULL;
result = dns_zt_create(mctx, rdclass, &view->zonetable);
if (result != ISC_R_SUCCESS) {
UNEXPECTED_ERROR("dns_zt_create() failed: %s",
isc_result_totext(result));
result = ISC_R_UNEXPECTED;
goto cleanup_mutex;
}
view->secroots_priv = NULL;
view->ntatable_priv = NULL;
view->fwdtable = NULL;
result = dns_fwdtable_create(mctx, &view->fwdtable);
if (result != ISC_R_SUCCESS) {
UNEXPECTED_ERROR("dns_fwdtable_create() failed: %s",
isc_result_totext(result));
result = ISC_R_UNEXPECTED;
goto cleanup_zt;
}
view->cache = NULL;
view->cachedb = NULL;
ISC_LIST_INIT(view->dlz_searched);
ISC_LIST_INIT(view->dlz_unsearched);
view->hints = NULL;
view->resolver = NULL;
view->adb = NULL;
view->requestmgr = NULL;
view->rdclass = rdclass;
view->frozen = false;
view->task = NULL;
isc_refcount_init(&view->references, 1);
isc_refcount_init(&view->weakrefs, 1);
atomic_init(&view->attributes,
(DNS_VIEWATTR_RESSHUTDOWN | DNS_VIEWATTR_ADBSHUTDOWN |
DNS_VIEWATTR_REQSHUTDOWN));
view->transports = NULL;
view->statickeys = NULL;
view->dynamickeys = NULL;
view->matchclients = NULL;
view->matchdestinations = NULL;
view->matchrecursiveonly = false;
result = dns_tsigkeyring_create(view->mctx, &view->dynamickeys);
if (result != ISC_R_SUCCESS) {
goto cleanup_weakrefs;
}
view->peers = NULL;
view->order = NULL;
view->delonly = NULL;
view->rootdelonly = false;
view->rootexclude = NULL;
view->adbstats = NULL;
view->resstats = NULL;
view->resquerystats = NULL;
view->cacheshared = false;
ISC_LIST_INIT(view->dns64);
view->dns64cnt = 0;
/*
* Initialize configuration data with default values.
*/
view->recursion = true;
view->qminimization = false;
view->qmin_strict = false;
view->auth_nxdomain = false; /* Was true in BIND 8 */
view->enablevalidation = true;
view->acceptexpired = false;
view->use_glue_cache = false;
view->minimal_any = false;
view->minimalresponses = dns_minimal_no;
view->transfer_format = dns_one_answer;
view->cacheacl = NULL;
view->cacheonacl = NULL;
view->checknames = false;
view->queryacl = NULL;
view->queryonacl = NULL;
view->recursionacl = NULL;
view->recursiononacl = NULL;
view->sortlist = NULL;
view->transferacl = NULL;
view->notifyacl = NULL;
view->updateacl = NULL;
view->upfwdacl = NULL;
view->denyansweracl = NULL;
view->nocasecompress = NULL;
view->msgcompression = true;
view->answeracl_exclude = NULL;
view->denyanswernames = NULL;
view->answernames_exclude = NULL;
view->rrl = NULL;
view->sfd = NULL;
view->provideixfr = true;
view->maxcachettl = 7 * 24 * 3600;
view->maxncachettl = 3 * 3600;
view->mincachettl = 0;
view->minncachettl = 0;
view->nta_lifetime = 0;
view->nta_recheck = 0;
view->prefetch_eligible = 0;
view->prefetch_trigger = 0;
view->dstport = 53;
view->preferred_glue = 0;
view->flush = false;
view->maxudp = 0;
view->staleanswerttl = 1;
view->staleanswersok = dns_stale_answer_conf;
view->staleanswersenable = false;
view->nocookieudp = 0;
view->padding = 0;
view->pad_acl = NULL;
view->maxbits = 0;
view->rpzs = NULL;
view->catzs = NULL;
view->managed_keys = NULL;
view->redirect = NULL;
view->redirectzone = NULL;
dns_fixedname_init(&view->redirectfixed);
view->requestnsid = false;
view->sendcookie = true;
view->requireservercookie = false;
view->synthfromdnssec = true;
view->trust_anchor_telemetry = true;
view->root_key_sentinel = true;
view->new_zone_dir = NULL;
view->new_zone_file = NULL;
view->new_zone_db = NULL;
view->new_zone_dbenv = NULL;
view->new_zone_mapsize = 0ULL;
view->new_zone_config = NULL;
view->cfg_destroy = NULL;
view->fail_ttl = 0;
view->failcache = NULL;
result = dns_badcache_init(view->mctx, DNS_VIEW_FAILCACHESIZE,
&view->failcache);
if (result != ISC_R_SUCCESS) {
goto cleanup_dynkeys;
}
view->v6bias = 0;
view->dtenv = NULL;
view->dttypes = 0;
view->plugins = NULL;
view->plugins_free = NULL;
view->hooktable = NULL;
view->hooktable_free = NULL;
view->max_restarts = DEFAULT_MAX_RESTARTS;
isc_mutex_init(&view->new_zone_lock);
result = dns_order_create(view->mctx, &view->order);
if (result != ISC_R_SUCCESS) {
goto cleanup_new_zone_lock;
}
result = dns_peerlist_new(view->mctx, &view->peers);
if (result != ISC_R_SUCCESS) {
goto cleanup_order;
}
result = dns_aclenv_create(view->mctx, &view->aclenv);
if (result != ISC_R_SUCCESS) {
goto cleanup_peerlist;
}
ISC_LINK_INIT(view, link);
ISC_EVENT_INIT(&view->resevent, sizeof(view->resevent), 0, NULL,
DNS_EVENT_VIEWRESSHUTDOWN, resolver_shutdown, view, NULL,
NULL, NULL);
ISC_EVENT_INIT(&view->adbevent, sizeof(view->adbevent), 0, NULL,
DNS_EVENT_VIEWADBSHUTDOWN, adb_shutdown, view, NULL,
NULL, NULL);
ISC_EVENT_INIT(&view->reqevent, sizeof(view->reqevent), 0, NULL,
DNS_EVENT_VIEWREQSHUTDOWN, req_shutdown, view, NULL,
NULL, NULL);
view->viewlist = NULL;
view->magic = DNS_VIEW_MAGIC;
*viewp = view;
return ISC_R_SUCCESS;
cleanup_peerlist:
if (view->peers != NULL) {
dns_peerlist_detach(&view->peers);
}
cleanup_order:
if (view->order != NULL) {
dns_order_detach(&view->order);
}
cleanup_new_zone_lock:
isc_mutex_destroy(&view->new_zone_lock);
dns_badcache_destroy(&view->failcache);
cleanup_dynkeys:
if (view->dynamickeys != NULL) {
dns_tsigkeyring_detach(&view->dynamickeys);
}
cleanup_weakrefs:
isc_refcount_decrementz(&view->weakrefs);
isc_refcount_destroy(&view->weakrefs);
isc_refcount_decrementz(&view->references);
isc_refcount_destroy(&view->references);
if (view->fwdtable != NULL) {
dns_fwdtable_destroy(&view->fwdtable);
}
cleanup_zt:
if (view->zonetable != NULL) {
dns_zt_detach(&view->zonetable);
}
cleanup_mutex:
isc_rwlock_destroy(&view->sfd_lock);
isc_mutex_destroy(&view->lock);
if (view->nta_file != NULL) {
isc_mem_free(mctx, view->nta_file);
}
cleanup_name:
isc_mem_free(mctx, view->name);
isc_mem_putanddetach(&view->mctx, view, sizeof(*view));
return result;
}
static void
destroy(dns_view_t *view) {
dns_dns64_t *dns64;
dns_dlzdb_t *dlzdb;
REQUIRE(!ISC_LINK_LINKED(view, link));
REQUIRE(RESSHUTDOWN(view));
REQUIRE(ADBSHUTDOWN(view));
REQUIRE(REQSHUTDOWN(view));
isc_refcount_destroy(&view->references);
isc_refcount_destroy(&view->weakrefs);
if (view->order != NULL) {
dns_order_detach(&view->order);
}
if (view->peers != NULL) {
dns_peerlist_detach(&view->peers);
}
if (view->dynamickeys != NULL) {
isc_result_t result;
char template[PATH_MAX];
char keyfile[PATH_MAX];
FILE *fp = NULL;
result = isc_file_mktemplate(NULL, template, sizeof(template));
if (result == ISC_R_SUCCESS) {
(void)isc_file_openuniqueprivate(template, &fp);
}
if (fp == NULL) {
dns_tsigkeyring_detach(&view->dynamickeys);
} else {
result = dns_tsigkeyring_dumpanddetach(
&view->dynamickeys, fp);
if (result == ISC_R_SUCCESS) {
if (fclose(fp) == 0) {
result = isc_file_sanitize(
NULL, view->name, "tsigkeys",
keyfile, sizeof(keyfile));
if (result == ISC_R_SUCCESS) {
result = isc_file_rename(
template, keyfile);
}
}
if (result != ISC_R_SUCCESS) {
(void)remove(template);
}
} else {
(void)fclose(fp);
(void)remove(template);
}
}
}
if (view->transports != NULL) {
dns_transport_list_detach(&view->transports);
}
if (view->statickeys != NULL) {
dns_tsigkeyring_detach(&view->statickeys);
}
if (view->adb != NULL) {
dns_adb_detach(&view->adb);
}
if (view->resolver != NULL) {
dns_resolver_detach(&view->resolver);
}
dns_rrl_view_destroy(view);
if (view->rpzs != NULL) {
dns_rpz_shutdown_rpzs(view->rpzs);
dns_rpz_detach_rpzs(&view->rpzs);
}
if (view->catzs != NULL) {
dns_catz_shutdown_catzs(view->catzs);
dns_catz_detach_catzs(&view->catzs);
}
for (dlzdb = ISC_LIST_HEAD(view->dlz_searched); dlzdb != NULL;
dlzdb = ISC_LIST_HEAD(view->dlz_searched))
{
ISC_LIST_UNLINK(view->dlz_searched, dlzdb, link);
dns_dlzdestroy(&dlzdb);
}
for (dlzdb = ISC_LIST_HEAD(view->dlz_unsearched); dlzdb != NULL;
dlzdb = ISC_LIST_HEAD(view->dlz_unsearched))
{
ISC_LIST_UNLINK(view->dlz_unsearched, dlzdb, link);
dns_dlzdestroy(&dlzdb);
}
if (view->requestmgr != NULL) {
dns_requestmgr_detach(&view->requestmgr);
}
if (view->task != NULL) {
isc_task_detach(&view->task);
}
if (view->hints != NULL) {
dns_db_detach(&view->hints);
}
if (view->cachedb != NULL) {
dns_db_detach(&view->cachedb);
}
if (view->cache != NULL) {
dns_cache_detach(&view->cache);
}
if (view->nocasecompress != NULL) {
dns_acl_detach(&view->nocasecompress);
}
if (view->matchclients != NULL) {
dns_acl_detach(&view->matchclients);
}
if (view->matchdestinations != NULL) {
dns_acl_detach(&view->matchdestinations);
}
if (view->cacheacl != NULL) {
dns_acl_detach(&view->cacheacl);
}
if (view->cacheonacl != NULL) {
dns_acl_detach(&view->cacheonacl);
}
if (view->queryacl != NULL) {
dns_acl_detach(&view->queryacl);
}
if (view->queryonacl != NULL) {
dns_acl_detach(&view->queryonacl);
}
if (view->recursionacl != NULL) {
dns_acl_detach(&view->recursionacl);
}
if (view->recursiononacl != NULL) {
dns_acl_detach(&view->recursiononacl);
}
if (view->sortlist != NULL) {
dns_acl_detach(&view->sortlist);
}
if (view->transferacl != NULL) {
dns_acl_detach(&view->transferacl);
}
if (view->notifyacl != NULL) {
dns_acl_detach(&view->notifyacl);
}
if (view->updateacl != NULL) {
dns_acl_detach(&view->updateacl);
}
if (view->upfwdacl != NULL) {
dns_acl_detach(&view->upfwdacl);
}
if (view->denyansweracl != NULL) {
dns_acl_detach(&view->denyansweracl);
}
if (view->pad_acl != NULL) {
dns_acl_detach(&view->pad_acl);
}
if (view->answeracl_exclude != NULL) {
dns_rbt_destroy(&view->answeracl_exclude);
}
if (view->denyanswernames != NULL) {
dns_rbt_destroy(&view->denyanswernames);
}
if (view->answernames_exclude != NULL) {
dns_rbt_destroy(&view->answernames_exclude);
}
if (view->sfd != NULL) {
dns_rbt_destroy(&view->sfd);
}
if (view->delonly != NULL) {
dns_name_t *name;
int i;
for (i = 0; i < DNS_VIEW_DELONLYHASH; i++) {
name = ISC_LIST_HEAD(view->delonly[i]);
while (name != NULL) {
ISC_LIST_UNLINK(view->delonly[i], name, link);
dns_name_free(name, view->mctx);
isc_mem_put(view->mctx, name, sizeof(*name));
name = ISC_LIST_HEAD(view->delonly[i]);
}
}
isc_mem_put(view->mctx, view->delonly,
sizeof(dns_namelist_t) * DNS_VIEW_DELONLYHASH);
view->delonly = NULL;
}
if (view->rootexclude != NULL) {
dns_name_t *name;
int i;
for (i = 0; i < DNS_VIEW_DELONLYHASH; i++) {
name = ISC_LIST_HEAD(view->rootexclude[i]);
while (name != NULL) {
ISC_LIST_UNLINK(view->rootexclude[i], name,
link);
dns_name_free(name, view->mctx);
isc_mem_put(view->mctx, name, sizeof(*name));
name = ISC_LIST_HEAD(view->rootexclude[i]);
}
}
isc_mem_put(view->mctx, view->rootexclude,
sizeof(dns_namelist_t) * DNS_VIEW_DELONLYHASH);
view->rootexclude = NULL;
}
if (view->adbstats != NULL) {
isc_stats_detach(&view->adbstats);
}
if (view->resstats != NULL) {
isc_stats_detach(&view->resstats);
}
if (view->resquerystats != NULL) {
dns_stats_detach(&view->resquerystats);
}
if (view->secroots_priv != NULL) {
dns_keytable_detach(&view->secroots_priv);
}
if (view->ntatable_priv != NULL) {
dns_ntatable_detach(&view->ntatable_priv);
}
for (dns64 = ISC_LIST_HEAD(view->dns64); dns64 != NULL;
dns64 = ISC_LIST_HEAD(view->dns64))
{
dns_dns64_unlink(&view->dns64, dns64);
dns_dns64_destroy(&dns64);
}
if (view->managed_keys != NULL) {
dns_zone_detach(&view->managed_keys);
}
if (view->redirect != NULL) {
dns_zone_detach(&view->redirect);
}
#ifdef HAVE_DNSTAP
if (view->dtenv != NULL) {
dns_dt_detach(&view->dtenv);
}
#endif /* HAVE_DNSTAP */
dns_view_setnewzones(view, false, NULL, NULL, 0ULL);
if (view->new_zone_file != NULL) {
isc_mem_free(view->mctx, view->new_zone_file);
view->new_zone_file = NULL;
}
if (view->new_zone_dir != NULL) {
isc_mem_free(view->mctx, view->new_zone_dir);
view->new_zone_dir = NULL;
}
#ifdef HAVE_LMDB
if (view->new_zone_dbenv != NULL) {
mdb_env_close((MDB_env *)view->new_zone_dbenv);
view->new_zone_dbenv = NULL;
}
if (view->new_zone_db != NULL) {
isc_mem_free(view->mctx, view->new_zone_db);
view->new_zone_db = NULL;
}
#endif /* HAVE_LMDB */
dns_fwdtable_destroy(&view->fwdtable);
dns_aclenv_detach(&view->aclenv);
if (view->failcache != NULL) {
dns_badcache_destroy(&view->failcache);
}
isc_mutex_destroy(&view->new_zone_lock);
isc_rwlock_destroy(&view->sfd_lock);
isc_mutex_destroy(&view->lock);
isc_refcount_destroy(&view->references);
isc_refcount_destroy(&view->weakrefs);
isc_mem_free(view->mctx, view->nta_file);
isc_mem_free(view->mctx, view->name);
if (view->hooktable != NULL && view->hooktable_free != NULL) {
view->hooktable_free(view->mctx, &view->hooktable);
}
if (view->plugins != NULL && view->plugins_free != NULL) {
view->plugins_free(view->mctx, &view->plugins);
}
isc_mem_putanddetach(&view->mctx, view, sizeof(*view));
}
void
dns_view_attach(dns_view_t *source, dns_view_t **targetp) {
REQUIRE(DNS_VIEW_VALID(source));
REQUIRE(targetp != NULL && *targetp == NULL);
isc_refcount_increment(&source->references);
*targetp = source;
}
static void
view_flushanddetach(dns_view_t **viewp, bool flush) {
REQUIRE(viewp != NULL && DNS_VIEW_VALID(*viewp));
dns_view_t *view = *viewp;
*viewp = NULL;
if (flush) {
view->flush = flush;
}
if (isc_refcount_decrement(&view->references) == 1) {
dns_zone_t *mkzone = NULL, *rdzone = NULL;
dns_zt_t *zt = NULL;
isc_refcount_destroy(&view->references);
if (!RESSHUTDOWN(view)) {
dns_resolver_shutdown(view->resolver);
}
if (!ADBSHUTDOWN(view)) {
dns_adb_shutdown(view->adb);
}
if (!REQSHUTDOWN(view)) {
dns_requestmgr_shutdown(view->requestmgr);
}
LOCK(&view->lock);
if (view->zonetable != NULL) {
zt = view->zonetable;
view->zonetable = NULL;
if (view->flush) {
dns_zt_flush(zt);
}
}
if (view->managed_keys != NULL) {
mkzone = view->managed_keys;
view->managed_keys = NULL;
if (view->flush) {
dns_zone_flush(mkzone);
}
}
if (view->redirect != NULL) {
rdzone = view->redirect;
view->redirect = NULL;
if (view->flush) {
dns_zone_flush(rdzone);
}
}
if (view->catzs != NULL) {
dns_catz_shutdown_catzs(view->catzs);
dns_catz_detach_catzs(&view->catzs);
}
if (view->ntatable_priv != NULL) {
dns_ntatable_shutdown(view->ntatable_priv);
}
UNLOCK(&view->lock);
/* Need to detach zt and zones outside view lock */
if (zt != NULL) {
dns_zt_detach(&zt);
}
if (mkzone != NULL) {
dns_zone_detach(&mkzone);
}
if (rdzone != NULL) {
dns_zone_detach(&rdzone);
}
dns_view_weakdetach(&view);
}
}
void
dns_view_flushanddetach(dns_view_t **viewp) {
view_flushanddetach(viewp, true);
}
void
dns_view_detach(dns_view_t **viewp) {
view_flushanddetach(viewp, false);
}
static isc_result_t
dialup(dns_zone_t *zone, void *dummy) {
UNUSED(dummy);
dns_zone_dialup(zone);
return ISC_R_SUCCESS;
}
void
dns_view_dialup(dns_view_t *view) {
REQUIRE(DNS_VIEW_VALID(view));
REQUIRE(view->zonetable != NULL);
(void)dns_zt_apply(view->zonetable, isc_rwlocktype_read, false, NULL,
dialup, NULL);
}
void
dns_view_weakattach(dns_view_t *source, dns_view_t **targetp) {
REQUIRE(DNS_VIEW_VALID(source));
REQUIRE(targetp != NULL && *targetp == NULL);
isc_refcount_increment(&source->weakrefs);
*targetp = source;
}
void
dns_view_weakdetach(dns_view_t **viewp) {
dns_view_t *view;
REQUIRE(viewp != NULL);
view = *viewp;
*viewp = NULL;
REQUIRE(DNS_VIEW_VALID(view));
if (isc_refcount_decrement(&view->weakrefs) == 1) {
destroy(view);
}
}
static void
resolver_shutdown(isc_task_t *task, isc_event_t *event) {
dns_view_t *view = event->ev_arg;
REQUIRE(event->ev_type == DNS_EVENT_VIEWRESSHUTDOWN);
REQUIRE(DNS_VIEW_VALID(view));
REQUIRE(view->task == task);
UNUSED(task);
isc_event_free(&event);
atomic_fetch_or(&view->attributes, DNS_VIEWATTR_RESSHUTDOWN);
dns_view_weakdetach(&view);
}
static void
adb_shutdown(isc_task_t *task, isc_event_t *event) {
dns_view_t *view = event->ev_arg;
REQUIRE(event->ev_type == DNS_EVENT_VIEWADBSHUTDOWN);
REQUIRE(DNS_VIEW_VALID(view));
REQUIRE(view->task == task);
UNUSED(task);
isc_event_free(&event);
atomic_fetch_or(&view->attributes, DNS_VIEWATTR_ADBSHUTDOWN);
dns_view_weakdetach(&view);
}
static void
req_shutdown(isc_task_t *task, isc_event_t *event) {
dns_view_t *view = event->ev_arg;
REQUIRE(event->ev_type == DNS_EVENT_VIEWREQSHUTDOWN);
REQUIRE(DNS_VIEW_VALID(view));
REQUIRE(view->task == task);
UNUSED(task);
isc_event_free(&event);
atomic_fetch_or(&view->attributes, DNS_VIEWATTR_REQSHUTDOWN);
dns_view_weakdetach(&view);
}
isc_result_t
dns_view_createzonetable(dns_view_t *view) {
REQUIRE(DNS_VIEW_VALID(view));
REQUIRE(!view->frozen);
REQUIRE(view->zonetable == NULL);
return dns_zt_create(view->mctx, view->rdclass, &view->zonetable);
}
isc_result_t
dns_view_createresolver(dns_view_t *view, isc_taskmgr_t *taskmgr,
unsigned int ntasks, unsigned int ndisp, isc_nm_t *nm,
isc_timermgr_t *timermgr, unsigned int options,
dns_dispatchmgr_t *dispatchmgr,
dns_dispatch_t *dispatchv4,
dns_dispatch_t *dispatchv6) {
isc_result_t result;
isc_event_t *event;
isc_mem_t *mctx = NULL;
REQUIRE(DNS_VIEW_VALID(view));
REQUIRE(!view->frozen);
REQUIRE(view->resolver == NULL);
result = isc_task_create(taskmgr, 0, &view->task);
if (result != ISC_R_SUCCESS) {
return result;
}
isc_task_setname(view->task, "view", view);
result = dns_resolver_create(view, taskmgr, ntasks, ndisp, nm, timermgr,
options, dispatchmgr, dispatchv4,
dispatchv6, &view->resolver);
if (result != ISC_R_SUCCESS) {
isc_task_detach(&view->task);
return result;
}
event = &view->resevent;
dns_resolver_whenshutdown(view->resolver, view->task, &event);
atomic_fetch_and(&view->attributes, ~DNS_VIEWATTR_RESSHUTDOWN);
isc_refcount_increment(&view->weakrefs);
isc_mem_create(&mctx);
isc_mem_setname(mctx, "ADB");
result = dns_adb_create(mctx, view, timermgr, taskmgr, &view->adb);
isc_mem_detach(&mctx);
if (result != ISC_R_SUCCESS) {
dns_resolver_shutdown(view->resolver);
return result;
}
event = &view->adbevent;
dns_adb_whenshutdown(view->adb, view->task, &event);
atomic_fetch_and(&view->attributes, ~DNS_VIEWATTR_ADBSHUTDOWN);
isc_refcount_increment(&view->weakrefs);
result = dns_requestmgr_create(
view->mctx, dns_resolver_taskmgr(view->resolver),
dns_resolver_dispatchmgr(view->resolver), dispatchv4,
dispatchv6, &view->requestmgr);
if (result != ISC_R_SUCCESS) {
dns_adb_shutdown(view->adb);
dns_resolver_shutdown(view->resolver);
return result;
}
event = &view->reqevent;
dns_requestmgr_whenshutdown(view->requestmgr, view->task, &event);
atomic_fetch_and(&view->attributes, ~DNS_VIEWATTR_REQSHUTDOWN);
isc_refcount_increment(&view->weakrefs);
return ISC_R_SUCCESS;
}
void
dns_view_setcache(dns_view_t *view, dns_cache_t *cache, bool shared) {
REQUIRE(DNS_VIEW_VALID(view));
REQUIRE(!view->frozen);
view->cacheshared = shared;
if (view->cache != NULL) {
dns_db_detach(&view->cachedb);
dns_cache_detach(&view->cache);
}
dns_cache_attach(cache, &view->cache);
dns_cache_attachdb(cache, &view->cachedb);
INSIST(DNS_DB_VALID(view->cachedb));
dns_cache_setmaxrrperset(view->cache, view->maxrrperset);
dns_cache_setmaxtypepername(view->cache, view->maxtypepername);
}
bool
dns_view_iscacheshared(dns_view_t *view) {
REQUIRE(DNS_VIEW_VALID(view));
return view->cacheshared;
}
void
dns_view_sethints(dns_view_t *view, dns_db_t *hints) {
REQUIRE(DNS_VIEW_VALID(view));
REQUIRE(!view->frozen);
REQUIRE(view->hints == NULL);
REQUIRE(dns_db_iszone(hints));
dns_db_attach(hints, &view->hints);
}
void
dns_view_settransports(dns_view_t *view, dns_transport_list_t *list) {
REQUIRE(DNS_VIEW_VALID(view));
REQUIRE(list != NULL);
if (view->transports != NULL) {
dns_transport_list_detach(&view->transports);
}
dns_transport_list_attach(list, &view->transports);
}
void
dns_view_setkeyring(dns_view_t *view, dns_tsig_keyring_t *ring) {
REQUIRE(DNS_VIEW_VALID(view));
REQUIRE(ring != NULL);
if (view->statickeys != NULL) {
dns_tsigkeyring_detach(&view->statickeys);
}
dns_tsigkeyring_attach(ring, &view->statickeys);
}
void
dns_view_setdynamickeyring(dns_view_t *view, dns_tsig_keyring_t *ring) {
REQUIRE(DNS_VIEW_VALID(view));
REQUIRE(ring != NULL);
if (view->dynamickeys != NULL) {
dns_tsigkeyring_detach(&view->dynamickeys);
}
dns_tsigkeyring_attach(ring, &view->dynamickeys);
}
void
dns_view_getdynamickeyring(dns_view_t *view, dns_tsig_keyring_t **ringp) {
REQUIRE(DNS_VIEW_VALID(view));
REQUIRE(ringp != NULL && *ringp == NULL);
if (view->dynamickeys != NULL) {
dns_tsigkeyring_attach(view->dynamickeys, ringp);
}
}
void
dns_view_restorekeyring(dns_view_t *view) {
FILE *fp;
char keyfile[PATH_MAX];
isc_result_t result;
REQUIRE(DNS_VIEW_VALID(view));
if (view->dynamickeys != NULL) {
result = isc_file_sanitize(NULL, view->name, "tsigkeys",
keyfile, sizeof(keyfile));
if (result == ISC_R_SUCCESS) {
fp = fopen(keyfile, "r");
if (fp != NULL) {
dns_keyring_restore(view->dynamickeys, fp);
(void)fclose(fp);
}
}
}
}
void
dns_view_setdstport(dns_view_t *view, in_port_t dstport) {
REQUIRE(DNS_VIEW_VALID(view));
view->dstport = dstport;
}
void
dns_view_freeze(dns_view_t *view) {
REQUIRE(DNS_VIEW_VALID(view));
REQUIRE(!view->frozen);
if (view->resolver != NULL) {
INSIST(view->cachedb != NULL);
dns_resolver_freeze(view->resolver);
}
view->frozen = true;
}
void
dns_view_thaw(dns_view_t *view) {
REQUIRE(DNS_VIEW_VALID(view));
REQUIRE(view->frozen);
view->frozen = false;
}
isc_result_t
dns_view_addzone(dns_view_t *view, dns_zone_t *zone) {
isc_result_t result = ISC_R_SHUTTINGDOWN;
dns_zt_t *zt = NULL;
REQUIRE(DNS_VIEW_VALID(view));
REQUIRE(!view->frozen);
LOCK(&view->lock);
if (view->zonetable != NULL) {
dns_zt_attach(view->zonetable, &zt);
}
UNLOCK(&view->lock);
if (zt != NULL) {
result = dns_zt_mount(zt, zone);
dns_zt_detach(&zt);
}
return result;
}
isc_result_t
dns_view_findzone(dns_view_t *view, const dns_name_t *name,
dns_zone_t **zonep) {
isc_result_t result;
REQUIRE(DNS_VIEW_VALID(view));
LOCK(&view->lock);
if (view->zonetable != NULL) {
result = dns_zt_find(view->zonetable, name, 0, NULL, zonep);
if (result == DNS_R_PARTIALMATCH) {
dns_zone_detach(zonep);
result = ISC_R_NOTFOUND;
}
} else {
result = ISC_R_NOTFOUND;
}
UNLOCK(&view->lock);
return result;
}
isc_result_t
dns_view_find(dns_view_t *view, const dns_name_t *name, dns_rdatatype_t type,
isc_stdtime_t now, unsigned int options, bool use_hints,
bool use_static_stub, dns_db_t **dbp, dns_dbnode_t **nodep,
dns_name_t *foundname, dns_rdataset_t *rdataset,
dns_rdataset_t *sigrdataset) {
isc_result_t result;
dns_db_t *db, *zdb;
dns_dbnode_t *node, *znode;
bool is_cache, is_staticstub_zone;
dns_rdataset_t zrdataset, zsigrdataset;
dns_zone_t *zone;
/*
* Find an rdataset whose owner name is 'name', and whose type is
* 'type'.
*/
REQUIRE(DNS_VIEW_VALID(view));
REQUIRE(view->frozen);
REQUIRE(type != dns_rdatatype_rrsig);
REQUIRE(rdataset != NULL); /* XXXBEW - remove this */
REQUIRE(nodep == NULL || *nodep == NULL);
/*
* Initialize.
*/
dns_rdataset_init(&zrdataset);
dns_rdataset_init(&zsigrdataset);
zdb = NULL;
znode = NULL;
/*
* Find a database to answer the query.
*/
db = NULL;
node = NULL;
is_staticstub_zone = false;
zone = NULL;
LOCK(&view->lock);
if (view->zonetable != NULL) {
result = dns_zt_find(view->zonetable, name, DNS_ZTFIND_MIRROR,
NULL, &zone);
} else {
result = ISC_R_NOTFOUND;
}
UNLOCK(&view->lock);
if (zone != NULL && dns_zone_gettype(zone) == dns_zone_staticstub &&
!use_static_stub)
{
result = ISC_R_NOTFOUND;
}
if (result == ISC_R_SUCCESS || result == DNS_R_PARTIALMATCH) {
result = dns_zone_getdb(zone, &db);
if (result != ISC_R_SUCCESS && view->cachedb != NULL) {
dns_db_attach(view->cachedb, &db);
} else if (result != ISC_R_SUCCESS) {
goto cleanup;
}
if (dns_zone_gettype(zone) == dns_zone_staticstub &&
dns_name_equal(name, dns_zone_getorigin(zone)))
{
is_staticstub_zone = true;
}
} else if (result == ISC_R_NOTFOUND && view->cachedb != NULL) {
dns_db_attach(view->cachedb, &db);
} else {
goto cleanup;
}
is_cache = dns_db_iscache(db);
db_find:
/*
* Now look for an answer in the database.
*/
result = dns_db_find(db, name, NULL, type, options, now, &node,
foundname, rdataset, sigrdataset);
if (result == DNS_R_DELEGATION || result == ISC_R_NOTFOUND) {
if (dns_rdataset_isassociated(rdataset)) {
dns_rdataset_disassociate(rdataset);
}
if (sigrdataset != NULL &&
dns_rdataset_isassociated(sigrdataset))
{
dns_rdataset_disassociate(sigrdataset);
}
if (node != NULL) {
dns_db_detachnode(db, &node);
}
if (!is_cache) {
dns_db_detach(&db);
if (view->cachedb != NULL && !is_staticstub_zone) {
/*
* Either the answer is in the cache, or we
* don't know it.
* Note that if the result comes from a
* static-stub zone we stop the search here
* (see the function description in view.h).
*/
is_cache = true;
dns_db_attach(view->cachedb, &db);
goto db_find;
}
} else {
/*
* We don't have the data in the cache. If we've got
* glue from the zone, use it.
*/
if (dns_rdataset_isassociated(&zrdataset)) {
dns_rdataset_clone(&zrdataset, rdataset);
if (sigrdataset != NULL &&
dns_rdataset_isassociated(&zsigrdataset))
{
dns_rdataset_clone(&zsigrdataset,
sigrdataset);
}
result = DNS_R_GLUE;
if (db != NULL) {
dns_db_detach(&db);
}
dns_db_attach(zdb, &db);
dns_db_attachnode(db, znode, &node);
goto cleanup;
}
}
/*
* We don't know the answer.
*/
result = ISC_R_NOTFOUND;
} else if (result == DNS_R_GLUE) {
if (view->cachedb != NULL && !is_staticstub_zone) {
/*
* We found an answer, but the cache may be better.
* Remember what we've got and go look in the cache.
*/
is_cache = true;
dns_rdataset_clone(rdataset, &zrdataset);
dns_rdataset_disassociate(rdataset);
if (sigrdataset != NULL &&
dns_rdataset_isassociated(sigrdataset))
{
dns_rdataset_clone(sigrdataset, &zsigrdataset);
dns_rdataset_disassociate(sigrdataset);
}
dns_db_attach(db, &zdb);
dns_db_attachnode(zdb, node, &znode);
dns_db_detachnode(db, &node);
dns_db_detach(&db);
dns_db_attach(view->cachedb, &db);
goto db_find;
}
/*
* Otherwise, the glue is the best answer.
*/
result = ISC_R_SUCCESS;
}
if (result == ISC_R_NOTFOUND && !is_staticstub_zone && use_hints &&
view->hints != NULL)
{
if (dns_rdataset_isassociated(rdataset)) {
dns_rdataset_disassociate(rdataset);
}
if (sigrdataset != NULL &&
dns_rdataset_isassociated(sigrdataset))
{
dns_rdataset_disassociate(sigrdataset);
}
if (db != NULL) {
if (node != NULL) {
dns_db_detachnode(db, &node);
}
dns_db_detach(&db);
}
result = dns_db_find(view->hints, name, NULL, type, options,
now, &node, foundname, rdataset,
sigrdataset);
if (result == ISC_R_SUCCESS || result == DNS_R_GLUE) {
/*
* We just used a hint. Let the resolver know it
* should consider priming.
*/
dns_resolver_prime(view->resolver);
dns_db_attach(view->hints, &db);
result = DNS_R_HINT;
} else if (result == DNS_R_NXRRSET) {
dns_db_attach(view->hints, &db);
result = DNS_R_HINTNXRRSET;
} else if (result == DNS_R_NXDOMAIN) {
result = ISC_R_NOTFOUND;
}
/*
* Cleanup if non-standard hints are used.
*/
if (db == NULL && node != NULL) {
dns_db_detachnode(view->hints, &node);
}
}
cleanup:
if (dns_rdataset_isassociated(&zrdataset)) {
dns_rdataset_disassociate(&zrdataset);
if (dns_rdataset_isassociated(&zsigrdataset)) {
dns_rdataset_disassociate(&zsigrdataset);
}
}
if (zdb != NULL) {
if (znode != NULL) {
dns_db_detachnode(zdb, &znode);
}
dns_db_detach(&zdb);
}
if (db != NULL) {
if (node != NULL) {
if (nodep != NULL) {
*nodep = node;
} else {
dns_db_detachnode(db, &node);
}
}
if (dbp != NULL) {
*dbp = db;
} else {
dns_db_detach(&db);
}
} else {
INSIST(node == NULL);
}
if (zone != NULL) {
dns_zone_detach(&zone);
}
return result;
}
isc_result_t
dns_view_simplefind(dns_view_t *view, const dns_name_t *name,
dns_rdatatype_t type, isc_stdtime_t now,
unsigned int options, bool use_hints,
dns_rdataset_t *rdataset, dns_rdataset_t *sigrdataset) {
isc_result_t result;
dns_fixedname_t foundname;
dns_fixedname_init(&foundname);
result = dns_view_find(view, name, type, now, options, use_hints, false,
NULL, NULL, dns_fixedname_name(&foundname),
rdataset, sigrdataset);
if (result == DNS_R_NXDOMAIN) {
/*
* The rdataset and sigrdataset of the relevant NSEC record
* may be returned, but the caller cannot use them because
* foundname is not returned by this simplified API. We
* disassociate them here to prevent any misuse by the caller.
*/
if (dns_rdataset_isassociated(rdataset)) {
dns_rdataset_disassociate(rdataset);
}
if (sigrdataset != NULL &&
dns_rdataset_isassociated(sigrdataset))
{
dns_rdataset_disassociate(sigrdataset);
}
} else if (result != ISC_R_SUCCESS && result != DNS_R_GLUE &&
result != DNS_R_HINT && result != DNS_R_NCACHENXDOMAIN &&
result != DNS_R_NCACHENXRRSET && result != DNS_R_NXRRSET &&
result != DNS_R_HINTNXRRSET && result != ISC_R_NOTFOUND)
{
if (dns_rdataset_isassociated(rdataset)) {
dns_rdataset_disassociate(rdataset);
}
if (sigrdataset != NULL &&
dns_rdataset_isassociated(sigrdataset))
{
dns_rdataset_disassociate(sigrdataset);
}
result = ISC_R_NOTFOUND;
}
return result;
}
isc_result_t
dns_view_findzonecut(dns_view_t *view, const dns_name_t *name,
dns_name_t *fname, dns_name_t *dcname, isc_stdtime_t now,
unsigned int options, bool use_hints, bool use_cache,
dns_rdataset_t *rdataset, dns_rdataset_t *sigrdataset) {
isc_result_t result;
dns_db_t *db;
bool is_cache, use_zone, try_hints;
dns_zone_t *zone;
dns_name_t *zfname;
dns_rdataset_t zrdataset, zsigrdataset;
dns_fixedname_t zfixedname;
unsigned int ztoptions = DNS_ZTFIND_MIRROR;
REQUIRE(DNS_VIEW_VALID(view));
REQUIRE(view->frozen);
db = NULL;
use_zone = false;
try_hints = false;
zfname = NULL;
/*
* Initialize.
*/
dns_fixedname_init(&zfixedname);
dns_rdataset_init(&zrdataset);
dns_rdataset_init(&zsigrdataset);
/*
* Find the right database.
*/
zone = NULL;
LOCK(&view->lock);
if (view->zonetable != NULL) {
if ((options & DNS_DBFIND_NOEXACT) != 0) {
ztoptions |= DNS_ZTFIND_NOEXACT;
}
result = dns_zt_find(view->zonetable, name, ztoptions, NULL,
&zone);
} else {
result = ISC_R_NOTFOUND;
}
UNLOCK(&view->lock);
if (result == ISC_R_SUCCESS || result == DNS_R_PARTIALMATCH) {
result = dns_zone_getdb(zone, &db);
}
if (result == ISC_R_NOTFOUND) {
/*
* We're not directly authoritative for this query name, nor
* is it a subdomain of any zone for which we're
* authoritative.
*/
if (use_cache && view->cachedb != NULL) {
/*
* We have a cache; try it.
*/
dns_db_attach(view->cachedb, &db);
} else if (use_hints && view->hints != NULL) {
/*
* Maybe we have hints...
*/
try_hints = true;
goto finish;
} else {
result = DNS_R_NXDOMAIN;
goto cleanup;
}
} else if (result != ISC_R_SUCCESS) {
/*
* Something is broken.
*/
goto cleanup;
}
is_cache = dns_db_iscache(db);
db_find:
/*
* Look for the zonecut.
*/
if (!is_cache) {
result = dns_db_find(db, name, NULL, dns_rdatatype_ns, options,
now, NULL, fname, rdataset, sigrdataset);
if (result == DNS_R_DELEGATION) {
result = ISC_R_SUCCESS;
} else if (result != ISC_R_SUCCESS) {
goto cleanup;
}
/*
* Tag static stub NS RRset so that when we look for
* addresses we use the configured server addresses.
*/
if (dns_zone_gettype(zone) == dns_zone_staticstub) {
rdataset->attributes |= DNS_RDATASETATTR_STATICSTUB;
}
if (use_cache && view->cachedb != NULL && db != view->hints) {
/*
* We found an answer, but the cache may be better.
*/
zfname = dns_fixedname_name(&zfixedname);
dns_name_copy(fname, zfname);
dns_rdataset_clone(rdataset, &zrdataset);
dns_rdataset_disassociate(rdataset);
if (sigrdataset != NULL &&
dns_rdataset_isassociated(sigrdataset))
{
dns_rdataset_clone(sigrdataset, &zsigrdataset);
dns_rdataset_disassociate(sigrdataset);
}
dns_db_detach(&db);
dns_db_attach(view->cachedb, &db);
is_cache = true;
goto db_find;
}
} else {
result = dns_db_findzonecut(db, name, options, now, NULL, fname,
dcname, rdataset, sigrdataset);
if (result == ISC_R_SUCCESS) {
if (zfname != NULL &&
(!dns_name_issubdomain(fname, zfname) ||
(dns_zone_gettype(zone) == dns_zone_staticstub &&
dns_name_equal(fname, zfname))))
{
/*
* We found a zonecut in the cache, but our
* zone delegation is better.
*/
use_zone = true;
}
} else if (result == ISC_R_NOTFOUND) {
if (zfname != NULL) {
/*
* We didn't find anything in the cache, but we
* have a zone delegation, so use it.
*/
use_zone = true;
result = ISC_R_SUCCESS;
} else if (use_hints && view->hints != NULL) {
/*
* Maybe we have hints...
*/
try_hints = true;
result = ISC_R_SUCCESS;
} else {
result = DNS_R_NXDOMAIN;
}
} else {
/*
* Something bad happened.
*/
goto cleanup;
}
}
finish:
if (use_zone) {
if (dns_rdataset_isassociated(rdataset)) {
dns_rdataset_disassociate(rdataset);
if (sigrdataset != NULL &&
dns_rdataset_isassociated(sigrdataset))
{
dns_rdataset_disassociate(sigrdataset);
}
}
dns_name_copy(zfname, fname);
if (dcname != NULL) {
dns_name_copy(zfname, dcname);
}
dns_rdataset_clone(&zrdataset, rdataset);
if (sigrdataset != NULL &&
dns_rdataset_isassociated(&zrdataset))
{
dns_rdataset_clone(&zsigrdataset, sigrdataset);
}
} else if (try_hints) {
/*
* We've found nothing so far, but we have hints.
*/
result = dns_db_find(view->hints, dns_rootname, NULL,
dns_rdatatype_ns, 0, now, NULL, fname,
rdataset, NULL);
if (result != ISC_R_SUCCESS) {
/*
* We can't even find the hints for the root
* nameservers!
*/
if (dns_rdataset_isassociated(rdataset)) {
dns_rdataset_disassociate(rdataset);
}
result = ISC_R_NOTFOUND;
} else if (dcname != NULL) {
dns_name_copy(fname, dcname);
}
}
cleanup:
if (dns_rdataset_isassociated(&zrdataset)) {
dns_rdataset_disassociate(&zrdataset);
if (dns_rdataset_isassociated(&zsigrdataset)) {
dns_rdataset_disassociate(&zsigrdataset);
}
}
if (db != NULL) {
dns_db_detach(&db);
}
if (zone != NULL) {
dns_zone_detach(&zone);
}
return result;
}
isc_result_t
dns_viewlist_find(dns_viewlist_t *list, const char *name,
dns_rdataclass_t rdclass, dns_view_t **viewp) {
dns_view_t *view;
REQUIRE(list != NULL);
for (view = ISC_LIST_HEAD(*list); view != NULL;
view = ISC_LIST_NEXT(view, link))
{
if (strcmp(view->name, name) == 0 && view->rdclass == rdclass) {
break;
}
}
if (view == NULL) {
return ISC_R_NOTFOUND;
}
dns_view_attach(view, viewp);
return ISC_R_SUCCESS;
}
isc_result_t
dns_viewlist_findzone(dns_viewlist_t *list, const dns_name_t *name,
bool allclasses, dns_rdataclass_t rdclass,
dns_zone_t **zonep) {
dns_view_t *view;
isc_result_t result;
dns_zone_t *zone1 = NULL, *zone2 = NULL;
dns_zone_t **zp = NULL;
REQUIRE(list != NULL);
REQUIRE(zonep != NULL && *zonep == NULL);
for (view = ISC_LIST_HEAD(*list); view != NULL;
view = ISC_LIST_NEXT(view, link))
{
if (!allclasses && view->rdclass != rdclass) {
continue;
}
/*
* If the zone is defined in more than one view,
* treat it as not found.
*/
zp = (zone1 == NULL) ? &zone1 : &zone2;
LOCK(&view->lock);
if (view->zonetable != NULL) {
result = dns_zt_find(view->zonetable, name, 0, NULL,
zp);
} else {
result = ISC_R_NOTFOUND;
}
UNLOCK(&view->lock);
INSIST(result == ISC_R_SUCCESS || result == ISC_R_NOTFOUND ||
result == DNS_R_PARTIALMATCH);
/* Treat a partial match as no match */
if (result == DNS_R_PARTIALMATCH) {
dns_zone_detach(zp);
result = ISC_R_NOTFOUND;
POST(result);
}
if (zone2 != NULL) {
dns_zone_detach(&zone1);
dns_zone_detach(&zone2);
return ISC_R_MULTIPLE;
}
}
if (zone1 != NULL) {
dns_zone_attach(zone1, zonep);
dns_zone_detach(&zone1);
return ISC_R_SUCCESS;
}
return ISC_R_NOTFOUND;
}
isc_result_t
dns_view_load(dns_view_t *view, bool stop, bool newonly) {
REQUIRE(DNS_VIEW_VALID(view));
REQUIRE(view->zonetable != NULL);
return dns_zt_load(view->zonetable, stop, newonly);
}
isc_result_t
dns_view_asyncload(dns_view_t *view, bool newonly, dns_zt_allloaded_t callback,
void *arg) {
REQUIRE(DNS_VIEW_VALID(view));
REQUIRE(view->zonetable != NULL);
return dns_zt_asyncload(view->zonetable, newonly, callback, arg);
}
isc_result_t
dns_view_gettsig(dns_view_t *view, const dns_name_t *keyname,
dns_tsigkey_t **keyp) {
isc_result_t result;
REQUIRE(keyp != NULL && *keyp == NULL);
result = dns_tsigkey_find(keyp, keyname, NULL, view->statickeys);
if (result == ISC_R_NOTFOUND) {
result = dns_tsigkey_find(keyp, keyname, NULL,
view->dynamickeys);
}
return result;
}
isc_result_t
dns_view_gettransport(dns_view_t *view, const dns_transport_type_t type,
const dns_name_t *name, dns_transport_t **transportp) {
REQUIRE(DNS_VIEW_VALID(view));
REQUIRE(transportp != NULL && *transportp == NULL);
dns_transport_t *transport = dns_transport_find(type, name,
view->transports);
if (transport == NULL) {
return ISC_R_NOTFOUND;
}
*transportp = transport;
return ISC_R_SUCCESS;
}
isc_result_t
dns_view_getpeertsig(dns_view_t *view, const isc_netaddr_t *peeraddr,
dns_tsigkey_t **keyp) {
isc_result_t result;
dns_name_t *keyname = NULL;
dns_peer_t *peer = NULL;
result = dns_peerlist_peerbyaddr(view->peers, peeraddr, &peer);
if (result != ISC_R_SUCCESS) {
return result;
}
result = dns_peer_getkey(peer, &keyname);
if (result != ISC_R_SUCCESS) {
return result;
}
result = dns_view_gettsig(view, keyname, keyp);
return (result == ISC_R_NOTFOUND) ? ISC_R_FAILURE : result;
}
isc_result_t
dns_view_checksig(dns_view_t *view, isc_buffer_t *source, dns_message_t *msg) {
REQUIRE(DNS_VIEW_VALID(view));
REQUIRE(source != NULL);
return dns_tsig_verify(source, msg, view->statickeys,
view->dynamickeys);
}
isc_result_t
dns_view_dumpdbtostream(dns_view_t *view, FILE *fp) {
isc_result_t result;
REQUIRE(DNS_VIEW_VALID(view));
(void)fprintf(fp, ";\n; Cache dump of view '%s'\n;\n", view->name);
result = dns_master_dumptostream(view->mctx, view->cachedb, NULL,
&dns_master_style_cache,
dns_masterformat_text, NULL, fp);
if (result != ISC_R_SUCCESS) {
return result;
}
dns_adb_dump(view->adb, fp);
dns_resolver_printbadcache(view->resolver, fp);
dns_badcache_print(view->failcache, "SERVFAIL cache", fp);
return ISC_R_SUCCESS;
}
isc_result_t
dns_view_flushcache(dns_view_t *view, bool fixuponly) {
isc_result_t result;
REQUIRE(DNS_VIEW_VALID(view));
if (view->cachedb == NULL) {
return ISC_R_SUCCESS;
}
if (!fixuponly) {
result = dns_cache_flush(view->cache);
if (result != ISC_R_SUCCESS) {
return result;
}
}
dns_db_detach(&view->cachedb);
dns_cache_attachdb(view->cache, &view->cachedb);
if (view->resolver != NULL) {
dns_resolver_flushbadcache(view->resolver, NULL);
}
if (view->failcache != NULL) {
dns_badcache_flush(view->failcache);
}
dns_adb_flush(view->adb);
return ISC_R_SUCCESS;
}
isc_result_t
dns_view_flushname(dns_view_t *view, const dns_name_t *name) {
return dns_view_flushnode(view, name, false);
}
isc_result_t
dns_view_flushnode(dns_view_t *view, const dns_name_t *name, bool tree) {
isc_result_t result = ISC_R_SUCCESS;
REQUIRE(DNS_VIEW_VALID(view));
if (tree) {
if (view->adb != NULL) {
dns_adb_flushnames(view->adb, name);
}
if (view->resolver != NULL) {
dns_resolver_flushbadnames(view->resolver, name);
}
if (view->failcache != NULL) {
dns_badcache_flushtree(view->failcache, name);
}
} else {
if (view->adb != NULL) {
dns_adb_flushname(view->adb, name);
}
if (view->resolver != NULL) {
dns_resolver_flushbadcache(view->resolver, name);
}
if (view->failcache != NULL) {
dns_badcache_flushname(view->failcache, name);
}
}
if (view->cache != NULL) {
result = dns_cache_flushnode(view->cache, name, tree);
}
return result;
}
void
dns_view_adddelegationonly(dns_view_t *view, const dns_name_t *name) {
dns_name_t *item;
unsigned int hash;
REQUIRE(DNS_VIEW_VALID(view));
if (view->delonly == NULL) {
view->delonly = isc_mem_get(view->mctx,
sizeof(dns_namelist_t) *
DNS_VIEW_DELONLYHASH);
for (hash = 0; hash < DNS_VIEW_DELONLYHASH; hash++) {
ISC_LIST_INIT(view->delonly[hash]);
}
}
hash = dns_name_hash(name, false) % DNS_VIEW_DELONLYHASH;
item = ISC_LIST_HEAD(view->delonly[hash]);
while (item != NULL && !dns_name_equal(item, name)) {
item = ISC_LIST_NEXT(item, link);
}
if (item != NULL) {
return;
}
item = isc_mem_get(view->mctx, sizeof(*item));
dns_name_init(item, NULL);
dns_name_dup(name, view->mctx, item);
ISC_LIST_APPEND(view->delonly[hash], item, link);
}
void
dns_view_excludedelegationonly(dns_view_t *view, const dns_name_t *name) {
dns_name_t *item;
unsigned int hash;
REQUIRE(DNS_VIEW_VALID(view));
if (view->rootexclude == NULL) {
view->rootexclude = isc_mem_get(view->mctx,
sizeof(dns_namelist_t) *
DNS_VIEW_DELONLYHASH);
for (hash = 0; hash < DNS_VIEW_DELONLYHASH; hash++) {
ISC_LIST_INIT(view->rootexclude[hash]);
}
}
hash = dns_name_hash(name, false) % DNS_VIEW_DELONLYHASH;
item = ISC_LIST_HEAD(view->rootexclude[hash]);
while (item != NULL && !dns_name_equal(item, name)) {
item = ISC_LIST_NEXT(item, link);
}
if (item != NULL) {
return;
}
item = isc_mem_get(view->mctx, sizeof(*item));
dns_name_init(item, NULL);
dns_name_dup(name, view->mctx, item);
ISC_LIST_APPEND(view->rootexclude[hash], item, link);
}
bool
dns_view_isdelegationonly(dns_view_t *view, const dns_name_t *name) {
dns_name_t *item;
unsigned int hash;
REQUIRE(DNS_VIEW_VALID(view));
if (!view->rootdelonly && view->delonly == NULL) {
return false;
}
hash = dns_name_hash(name, false) % DNS_VIEW_DELONLYHASH;
if (view->rootdelonly && dns_name_countlabels(name) <= 2) {
if (view->rootexclude == NULL) {
return true;
}
item = ISC_LIST_HEAD(view->rootexclude[hash]);
while (item != NULL && !dns_name_equal(item, name)) {
item = ISC_LIST_NEXT(item, link);
}
if (item == NULL) {
return true;
}
}
if (view->delonly == NULL) {
return false;
}
item = ISC_LIST_HEAD(view->delonly[hash]);
while (item != NULL && !dns_name_equal(item, name)) {
item = ISC_LIST_NEXT(item, link);
}
if (item == NULL) {
return false;
}
return true;
}
void
dns_view_setrootdelonly(dns_view_t *view, bool value) {
REQUIRE(DNS_VIEW_VALID(view));
view->rootdelonly = value;
}
bool
dns_view_getrootdelonly(dns_view_t *view) {
REQUIRE(DNS_VIEW_VALID(view));
return view->rootdelonly;
}
isc_result_t
dns_view_freezezones(dns_view_t *view, bool value) {
REQUIRE(DNS_VIEW_VALID(view));
REQUIRE(view->zonetable != NULL);
return dns_zt_freezezones(view->zonetable, view, value);
}
void
dns_view_setadbstats(dns_view_t *view, isc_stats_t *stats) {
REQUIRE(DNS_VIEW_VALID(view));
REQUIRE(!view->frozen);
REQUIRE(view->adbstats == NULL);
isc_stats_attach(stats, &view->adbstats);
}
void
dns_view_getadbstats(dns_view_t *view, isc_stats_t **statsp) {
REQUIRE(DNS_VIEW_VALID(view));
REQUIRE(statsp != NULL && *statsp == NULL);
if (view->adbstats != NULL) {
isc_stats_attach(view->adbstats, statsp);
}
}
void
dns_view_setresstats(dns_view_t *view, isc_stats_t *stats) {
REQUIRE(DNS_VIEW_VALID(view));
REQUIRE(!view->frozen);
REQUIRE(view->resstats == NULL);
isc_stats_attach(stats, &view->resstats);
}
void
dns_view_getresstats(dns_view_t *view, isc_stats_t **statsp) {
REQUIRE(DNS_VIEW_VALID(view));
REQUIRE(statsp != NULL && *statsp == NULL);
if (view->resstats != NULL) {
isc_stats_attach(view->resstats, statsp);
}
}
void
dns_view_setresquerystats(dns_view_t *view, dns_stats_t *stats) {
REQUIRE(DNS_VIEW_VALID(view));
REQUIRE(!view->frozen);
REQUIRE(view->resquerystats == NULL);
dns_stats_attach(stats, &view->resquerystats);
}
void
dns_view_getresquerystats(dns_view_t *view, dns_stats_t **statsp) {
REQUIRE(DNS_VIEW_VALID(view));
REQUIRE(statsp != NULL && *statsp == NULL);
if (view->resquerystats != NULL) {
dns_stats_attach(view->resquerystats, statsp);
}
}
isc_result_t
dns_view_initntatable(dns_view_t *view, isc_taskmgr_t *taskmgr,
isc_timermgr_t *timermgr) {
REQUIRE(DNS_VIEW_VALID(view));
if (view->ntatable_priv != NULL) {
dns_ntatable_detach(&view->ntatable_priv);
}
return dns_ntatable_create(view, taskmgr, timermgr,
&view->ntatable_priv);
}
isc_result_t
dns_view_getntatable(dns_view_t *view, dns_ntatable_t **ntp) {
REQUIRE(DNS_VIEW_VALID(view));
REQUIRE(ntp != NULL && *ntp == NULL);
if (view->ntatable_priv == NULL) {
return ISC_R_NOTFOUND;
}
dns_ntatable_attach(view->ntatable_priv, ntp);
return ISC_R_SUCCESS;
}
isc_result_t
dns_view_initsecroots(dns_view_t *view, isc_mem_t *mctx) {
REQUIRE(DNS_VIEW_VALID(view));
if (view->secroots_priv != NULL) {
dns_keytable_detach(&view->secroots_priv);
}
return dns_keytable_create(mctx, &view->secroots_priv);
}
isc_result_t
dns_view_getsecroots(dns_view_t *view, dns_keytable_t **ktp) {
REQUIRE(DNS_VIEW_VALID(view));
REQUIRE(ktp != NULL && *ktp == NULL);
if (view->secroots_priv == NULL) {
return ISC_R_NOTFOUND;
}
dns_keytable_attach(view->secroots_priv, ktp);
return ISC_R_SUCCESS;
}
bool
dns_view_ntacovers(dns_view_t *view, isc_stdtime_t now, const dns_name_t *name,
const dns_name_t *anchor) {
REQUIRE(DNS_VIEW_VALID(view));
if (view->ntatable_priv == NULL) {
return false;
}
return dns_ntatable_covered(view->ntatable_priv, now, name, anchor);
}
isc_result_t
dns_view_issecuredomain(dns_view_t *view, const dns_name_t *name,
isc_stdtime_t now, bool checknta, bool *ntap,
bool *secure_domain) {
isc_result_t result;
bool secure = false;
dns_fixedname_t fn;
dns_name_t *anchor;
REQUIRE(DNS_VIEW_VALID(view));
if (view->secroots_priv == NULL) {
return ISC_R_NOTFOUND;
}
anchor = dns_fixedname_initname(&fn);
result = dns_keytable_issecuredomain(view->secroots_priv, name, anchor,
&secure);
if (result != ISC_R_SUCCESS) {
return result;
}
if (ntap != NULL) {
*ntap = false;
}
if (checknta && secure && view->ntatable_priv != NULL &&
dns_ntatable_covered(view->ntatable_priv, now, name, anchor))
{
if (ntap != NULL) {
*ntap = true;
}
secure = false;
}
*secure_domain = secure;
return ISC_R_SUCCESS;
}
void
dns_view_untrust(dns_view_t *view, const dns_name_t *keyname,
const dns_rdata_dnskey_t *dnskey) {
isc_result_t result;
dns_keytable_t *sr = NULL;
dns_rdata_dnskey_t tmpkey;
REQUIRE(DNS_VIEW_VALID(view));
REQUIRE(keyname != NULL);
REQUIRE(dnskey != NULL);
result = dns_view_getsecroots(view, &sr);
if (result != ISC_R_SUCCESS) {
return;
}
/*
* Clear the revoke bit, if set, so that the key will match what's
* in secroots now.
*/
tmpkey = *dnskey;
tmpkey.flags &= ~DNS_KEYFLAG_REVOKE;
result = dns_keytable_deletekey(sr, keyname, &tmpkey);
if (result == ISC_R_SUCCESS) {
/*
* If key was found in secroots, then it was a
* configured trust anchor, and we want to fail
* secure. If there are no other configured keys,
* then leave a null key so that we can't validate
* anymore.
*/
dns_keytable_marksecure(sr, keyname);
}
dns_keytable_detach(&sr);
}
bool
dns_view_istrusted(dns_view_t *view, const dns_name_t *keyname,
const dns_rdata_dnskey_t *dnskey) {
isc_result_t result;
dns_keytable_t *sr = NULL;
dns_keynode_t *knode = NULL;
bool answer = false;
dns_rdataset_t dsset;
REQUIRE(DNS_VIEW_VALID(view));
REQUIRE(keyname != NULL);
REQUIRE(dnskey != NULL);
result = dns_view_getsecroots(view, &sr);
if (result != ISC_R_SUCCESS) {
return false;
}
dns_rdataset_init(&dsset);
result = dns_keytable_find(sr, keyname, &knode);
if (result == ISC_R_SUCCESS) {
if (dns_keynode_dsset(knode, &dsset)) {
dns_rdata_t rdata = DNS_RDATA_INIT;
unsigned char data[4096], digest[DNS_DS_BUFFERSIZE];
dns_rdata_dnskey_t tmpkey = *dnskey;
dns_rdata_ds_t ds;
isc_buffer_t b;
dns_rdataclass_t rdclass = tmpkey.common.rdclass;
/*
* Clear the revoke bit, if set, so that the key
* will match what's in secroots now.
*/
tmpkey.flags &= ~DNS_KEYFLAG_REVOKE;
isc_buffer_init(&b, data, sizeof(data));
result = dns_rdata_fromstruct(&rdata, rdclass,
dns_rdatatype_dnskey,
&tmpkey, &b);
if (result != ISC_R_SUCCESS) {
goto finish;
}
result = dns_ds_fromkeyrdata(keyname, &rdata,
DNS_DSDIGEST_SHA256,
digest, &ds);
if (result != ISC_R_SUCCESS) {
goto finish;
}
dns_rdata_reset(&rdata);
isc_buffer_init(&b, data, sizeof(data));
result = dns_rdata_fromstruct(
&rdata, rdclass, dns_rdatatype_ds, &ds, &b);
if (result != ISC_R_SUCCESS) {
goto finish;
}
result = dns_rdataset_first(&dsset);
while (result == ISC_R_SUCCESS) {
dns_rdata_t this = DNS_RDATA_INIT;
dns_rdataset_current(&dsset, &this);
if (dns_rdata_compare(&rdata, &this) == 0) {
answer = true;
break;
}
result = dns_rdataset_next(&dsset);
}
}
}
finish:
if (dns_rdataset_isassociated(&dsset)) {
dns_rdataset_disassociate(&dsset);
}
if (knode != NULL) {
dns_keytable_detachkeynode(sr, &knode);
}
dns_keytable_detach(&sr);
return answer;
}
/*
* Create path to a directory and a filename constructed from viewname.
* This is a front-end to isc_file_sanitize(), allowing backward
* compatibility to older versions when a file couldn't be expected
* to be in the specified directory but might be in the current working
* directory instead.
*
* It first tests for the existence of a file <viewname>.<suffix> in
* 'directory'. If the file does not exist, it checks again in the
* current working directory. If it does not exist there either,
* return the path inside the directory.
*
* Returns ISC_R_SUCCESS if a path to an existing file is found or
* a new path is created; returns ISC_R_NOSPACE if the path won't
* fit in 'buflen'.
*/
static isc_result_t
nz_legacy(const char *directory, const char *viewname, const char *suffix,
char *buffer, size_t buflen) {
isc_result_t result;
char newbuf[PATH_MAX];
result = isc_file_sanitize(directory, viewname, suffix, buffer, buflen);
if (result != ISC_R_SUCCESS) {
return result;
} else if (directory == NULL || isc_file_exists(buffer)) {
return ISC_R_SUCCESS;
} else {
/* Save buffer */
strlcpy(newbuf, buffer, sizeof(newbuf));
}
/*
* It isn't in the specified directory; check CWD.
*/
result = isc_file_sanitize(NULL, viewname, suffix, buffer, buflen);
if (result != ISC_R_SUCCESS || isc_file_exists(buffer)) {
return result;
}
/*
* File does not exist in either 'directory' or CWD,
* so use the path in 'directory'.
*/
strlcpy(buffer, newbuf, buflen);
return ISC_R_SUCCESS;
}
isc_result_t
dns_view_setnewzones(dns_view_t *view, bool allow, void *cfgctx,
void (*cfg_destroy)(void **), uint64_t mapsize) {
isc_result_t result = ISC_R_SUCCESS;
char buffer[1024];
#ifdef HAVE_LMDB
MDB_env *env = NULL;
int status;
#endif /* ifdef HAVE_LMDB */
#ifndef HAVE_LMDB
UNUSED(mapsize);
#endif /* ifndef HAVE_LMDB */
REQUIRE(DNS_VIEW_VALID(view));
REQUIRE((cfgctx != NULL && cfg_destroy != NULL) || !allow);
if (view->new_zone_file != NULL) {
isc_mem_free(view->mctx, view->new_zone_file);
view->new_zone_file = NULL;
}
#ifdef HAVE_LMDB
if (view->new_zone_dbenv != NULL) {
mdb_env_close((MDB_env *)view->new_zone_dbenv);
view->new_zone_dbenv = NULL;
}
if (view->new_zone_db != NULL) {
isc_mem_free(view->mctx, view->new_zone_db);
view->new_zone_db = NULL;
}
#endif /* HAVE_LMDB */
if (view->new_zone_config != NULL) {
view->cfg_destroy(&view->new_zone_config);
view->cfg_destroy = NULL;
}
if (!allow) {
return ISC_R_SUCCESS;
}
CHECK(nz_legacy(view->new_zone_dir, view->name, "nzf", buffer,
sizeof(buffer)));
view->new_zone_file = isc_mem_strdup(view->mctx, buffer);
#ifdef HAVE_LMDB
CHECK(nz_legacy(view->new_zone_dir, view->name, "nzd", buffer,
sizeof(buffer)));
view->new_zone_db = isc_mem_strdup(view->mctx, buffer);
status = mdb_env_create(&env);
if (status != MDB_SUCCESS) {
isc_log_write(dns_lctx, DNS_LOGCATEGORY_GENERAL,
ISC_LOGMODULE_OTHER, ISC_LOG_ERROR,
"mdb_env_create failed: %s",
mdb_strerror(status));
CHECK(ISC_R_FAILURE);
}
if (mapsize != 0ULL) {
status = mdb_env_set_mapsize(env, mapsize);
if (status != MDB_SUCCESS) {
isc_log_write(dns_lctx, DNS_LOGCATEGORY_GENERAL,
ISC_LOGMODULE_OTHER, ISC_LOG_ERROR,
"mdb_env_set_mapsize failed: %s",
mdb_strerror(status));
CHECK(ISC_R_FAILURE);
}
view->new_zone_mapsize = mapsize;
}
status = mdb_env_open(env, view->new_zone_db, DNS_LMDB_FLAGS, 0600);
if (status != MDB_SUCCESS) {
isc_log_write(dns_lctx, DNS_LOGCATEGORY_GENERAL,
ISC_LOGMODULE_OTHER, ISC_LOG_ERROR,
"mdb_env_open of '%s' failed: %s",
view->new_zone_db, mdb_strerror(status));
CHECK(ISC_R_FAILURE);
}
view->new_zone_dbenv = env;
env = NULL;
#endif /* HAVE_LMDB */
view->new_zone_config = cfgctx;
view->cfg_destroy = cfg_destroy;
cleanup:
if (result != ISC_R_SUCCESS) {
if (view->new_zone_file != NULL) {
isc_mem_free(view->mctx, view->new_zone_file);
view->new_zone_file = NULL;
}
#ifdef HAVE_LMDB
if (view->new_zone_db != NULL) {
isc_mem_free(view->mctx, view->new_zone_db);
view->new_zone_db = NULL;
}
if (env != NULL) {
mdb_env_close(env);
}
#endif /* HAVE_LMDB */
view->new_zone_config = NULL;
view->cfg_destroy = NULL;
}
return result;
}
void
dns_view_setnewzonedir(dns_view_t *view, const char *dir) {
REQUIRE(DNS_VIEW_VALID(view));
if (view->new_zone_dir != NULL) {
isc_mem_free(view->mctx, view->new_zone_dir);
view->new_zone_dir = NULL;
}
if (dir == NULL) {
return;
}
view->new_zone_dir = isc_mem_strdup(view->mctx, dir);
}
const char *
dns_view_getnewzonedir(dns_view_t *view) {
REQUIRE(DNS_VIEW_VALID(view));
return view->new_zone_dir;
}
isc_result_t
dns_view_searchdlz(dns_view_t *view, const dns_name_t *name,
unsigned int minlabels, dns_clientinfomethods_t *methods,
dns_clientinfo_t *clientinfo, dns_db_t **dbp) {
dns_fixedname_t fname;
dns_name_t *zonename;
unsigned int namelabels;
unsigned int i;
isc_result_t result;
dns_dlzfindzone_t findzone;
dns_dlzdb_t *dlzdb;
dns_db_t *db, *best = NULL;
/*
* Performs checks to make sure data is as we expect it to be.
*/
REQUIRE(DNS_VIEW_VALID(view));
REQUIRE(name != NULL);
REQUIRE(dbp != NULL && *dbp == NULL);
/* setup a "fixed" dns name */
zonename = dns_fixedname_initname(&fname);
/* count the number of labels in the name */
namelabels = dns_name_countlabels(name);
for (dlzdb = ISC_LIST_HEAD(view->dlz_searched); dlzdb != NULL;
dlzdb = ISC_LIST_NEXT(dlzdb, link))
{
REQUIRE(DNS_DLZ_VALID(dlzdb));
/*
* loop through starting with the longest domain name and
* trying shorter names portions of the name until we find a
* match, have an error, or are below the 'minlabels'
* threshold. minlabels is 0, if neither the standard
* database nor any previous DLZ database had a zone name
* match. Otherwise minlabels is the number of labels
* in that name. We need to beat that for a "better"
* match for this DLZ database to be authoritative.
*/
for (i = namelabels; i > minlabels && i > 1; i--) {
if (i == namelabels) {
dns_name_copy(name, zonename);
} else {
dns_name_split(name, i, NULL, zonename);
}
/* ask SDLZ driver if the zone is supported */
db = NULL;
findzone = dlzdb->implementation->methods->findzone;
result = (*findzone)(dlzdb->implementation->driverarg,
dlzdb->dbdata, dlzdb->mctx,
view->rdclass, zonename, methods,
clientinfo, &db);
if (result != ISC_R_NOTFOUND) {
if (best != NULL) {
dns_db_detach(&best);
}
if (result == ISC_R_SUCCESS) {
INSIST(db != NULL);
dns_db_attach(db, &best);
dns_db_detach(&db);
minlabels = i;
} else {
if (db != NULL) {
dns_db_detach(&db);
}
break;
}
} else if (db != NULL) {
dns_db_detach(&db);
}
}
}
if (best != NULL) {
dns_db_attach(best, dbp);
dns_db_detach(&best);
return ISC_R_SUCCESS;
}
return ISC_R_NOTFOUND;
}
uint32_t
dns_view_getfailttl(dns_view_t *view) {
REQUIRE(DNS_VIEW_VALID(view));
return view->fail_ttl;
}
void
dns_view_setfailttl(dns_view_t *view, uint32_t fail_ttl) {
REQUIRE(DNS_VIEW_VALID(view));
view->fail_ttl = fail_ttl;
}
isc_result_t
dns_view_saventa(dns_view_t *view) {
isc_result_t result;
bool removefile = false;
dns_ntatable_t *ntatable = NULL;
FILE *fp = NULL;
REQUIRE(DNS_VIEW_VALID(view));
if (view->nta_lifetime == 0) {
return ISC_R_SUCCESS;
}
/* Open NTA save file for overwrite. */
CHECK(isc_stdio_open(view->nta_file, "w", &fp));
result = dns_view_getntatable(view, &ntatable);
if (result == ISC_R_NOTFOUND) {
removefile = true;
result = ISC_R_SUCCESS;
goto cleanup;
} else {
CHECK(result);
}
result = dns_ntatable_save(ntatable, fp);
if (result == ISC_R_NOTFOUND) {
removefile = true;
result = ISC_R_SUCCESS;
} else if (result == ISC_R_SUCCESS) {
result = isc_stdio_close(fp);
fp = NULL;
}
cleanup:
if (ntatable != NULL) {
dns_ntatable_detach(&ntatable);
}
if (fp != NULL) {
(void)isc_stdio_close(fp);
}
/* Don't leave half-baked NTA save files lying around. */
if (result != ISC_R_SUCCESS || removefile) {
(void)isc_file_remove(view->nta_file);
}
return result;
}
#define TSTR(t) ((t).value.as_textregion.base)
#define TLEN(t) ((t).value.as_textregion.length)
isc_result_t
dns_view_loadnta(dns_view_t *view) {
isc_result_t result;
dns_ntatable_t *ntatable = NULL;
isc_lex_t *lex = NULL;
isc_token_t token;
isc_stdtime_t now;
REQUIRE(DNS_VIEW_VALID(view));
if (view->nta_lifetime == 0) {
return ISC_R_SUCCESS;
}
CHECK(isc_lex_create(view->mctx, 1025, &lex));
CHECK(isc_lex_openfile(lex, view->nta_file));
CHECK(dns_view_getntatable(view, &ntatable));
isc_stdtime_get(&now);
for (;;) {
int options = (ISC_LEXOPT_EOL | ISC_LEXOPT_EOF);
char *name, *type, *timestamp;
size_t len;
dns_fixedname_t fn;
const dns_name_t *ntaname;
isc_buffer_t b;
isc_stdtime_t t;
bool forced;
CHECK(isc_lex_gettoken(lex, options, &token));
if (token.type == isc_tokentype_eof) {
break;
} else if (token.type != isc_tokentype_string) {
CHECK(ISC_R_UNEXPECTEDTOKEN);
}
name = TSTR(token);
len = TLEN(token);
if (strcmp(name, ".") == 0) {
ntaname = dns_rootname;
} else {
dns_name_t *fname;
fname = dns_fixedname_initname(&fn);
isc_buffer_init(&b, name, (unsigned int)len);
isc_buffer_add(&b, (unsigned int)len);
CHECK(dns_name_fromtext(fname, &b, dns_rootname, 0,
NULL));
ntaname = fname;
}
CHECK(isc_lex_gettoken(lex, options, &token));
if (token.type != isc_tokentype_string) {
CHECK(ISC_R_UNEXPECTEDTOKEN);
}
type = TSTR(token);
if (strcmp(type, "regular") == 0) {
forced = false;
} else if (strcmp(type, "forced") == 0) {
forced = true;
} else {
CHECK(ISC_R_UNEXPECTEDTOKEN);
}
CHECK(isc_lex_gettoken(lex, options, &token));
if (token.type != isc_tokentype_string) {
CHECK(ISC_R_UNEXPECTEDTOKEN);
}
timestamp = TSTR(token);
CHECK(dns_time32_fromtext(timestamp, &t));
CHECK(isc_lex_gettoken(lex, options, &token));
if (token.type != isc_tokentype_eol &&
token.type != isc_tokentype_eof)
{
CHECK(ISC_R_UNEXPECTEDTOKEN);
}
if (now <= t) {
if (t > (now + 604800)) {
t = now + 604800;
}
(void)dns_ntatable_add(ntatable, ntaname, forced, 0, t);
} else {
char nb[DNS_NAME_FORMATSIZE];
dns_name_format(ntaname, nb, sizeof(nb));
isc_log_write(dns_lctx, DNS_LOGCATEGORY_DNSSEC,
DNS_LOGMODULE_NTA, ISC_LOG_INFO,
"ignoring expired NTA at %s", nb);
}
}
cleanup:
if (ntatable != NULL) {
dns_ntatable_detach(&ntatable);
}
if (lex != NULL) {
isc_lex_close(lex);
isc_lex_destroy(&lex);
}
return result;
}
void
dns_view_setviewcommit(dns_view_t *view) {
dns_zone_t *redirect = NULL, *managed_keys = NULL;
REQUIRE(DNS_VIEW_VALID(view));
LOCK(&view->lock);
if (view->redirect != NULL) {
dns_zone_attach(view->redirect, &redirect);
}
if (view->managed_keys != NULL) {
dns_zone_attach(view->managed_keys, &managed_keys);
}
UNLOCK(&view->lock);
if (view->zonetable != NULL) {
dns_zt_setviewcommit(view->zonetable);
}
if (redirect != NULL) {
dns_zone_setviewcommit(redirect);
dns_zone_detach(&redirect);
}
if (managed_keys != NULL) {
dns_zone_setviewcommit(managed_keys);
dns_zone_detach(&managed_keys);
}
}
void
dns_view_setviewrevert(dns_view_t *view) {
dns_zone_t *redirect = NULL, *managed_keys = NULL;
dns_zt_t *zonetable;
REQUIRE(DNS_VIEW_VALID(view));
/*
* dns_zt_setviewrevert() attempts to lock this view, so we must
* release the lock.
*/
LOCK(&view->lock);
if (view->redirect != NULL) {
dns_zone_attach(view->redirect, &redirect);
}
if (view->managed_keys != NULL) {
dns_zone_attach(view->managed_keys, &managed_keys);
}
zonetable = view->zonetable;
UNLOCK(&view->lock);
if (redirect != NULL) {
dns_zone_setviewrevert(redirect);
dns_zone_detach(&redirect);
}
if (managed_keys != NULL) {
dns_zone_setviewrevert(managed_keys);
dns_zone_detach(&managed_keys);
}
if (zonetable != NULL) {
dns_zt_setviewrevert(zonetable);
}
}
bool
dns_view_staleanswerenabled(dns_view_t *view) {
uint32_t stale_ttl = 0;
bool result = false;
REQUIRE(DNS_VIEW_VALID(view));
if (dns_db_getservestalettl(view->cachedb, &stale_ttl) != ISC_R_SUCCESS)
{
return false;
}
if (stale_ttl > 0) {
if (view->staleanswersok == dns_stale_answer_yes) {
result = true;
} else if (view->staleanswersok == dns_stale_answer_conf) {
result = view->staleanswersenable;
}
}
return result;
}
static void
free_sfd(void *data, void *arg) {
isc_mem_put(arg, data, sizeof(unsigned int));
}
void
dns_view_sfd_add(dns_view_t *view, const dns_name_t *name) {
isc_result_t result;
dns_rbtnode_t *node = NULL;
REQUIRE(DNS_VIEW_VALID(view));
RWLOCK(&view->sfd_lock, isc_rwlocktype_write);
if (view->sfd == NULL) {
result = dns_rbt_create(view->mctx, free_sfd, view->mctx,
&view->sfd);
RUNTIME_CHECK(result == ISC_R_SUCCESS);
}
result = dns_rbt_addnode(view->sfd, name, &node);
RUNTIME_CHECK(result == ISC_R_SUCCESS || result == ISC_R_EXISTS);
if (node->data != NULL) {
unsigned int *count = node->data;
(*count)++;
} else {
unsigned int *count = isc_mem_get(view->mctx,
sizeof(unsigned int));
*count = 1;
node->data = count;
}
RWUNLOCK(&view->sfd_lock, isc_rwlocktype_write);
}
void
dns_view_sfd_del(dns_view_t *view, const dns_name_t *name) {
isc_result_t result;
void *data = NULL;
REQUIRE(DNS_VIEW_VALID(view));
RWLOCK(&view->sfd_lock, isc_rwlocktype_write);
INSIST(view->sfd != NULL);
result = dns_rbt_findname(view->sfd, name, 0, NULL, &data);
if (result == ISC_R_SUCCESS) {
unsigned int *count = data;
INSIST(count != NULL);
if (--(*count) == 0U) {
result = dns_rbt_deletename(view->sfd, name, false);
RUNTIME_CHECK(result == ISC_R_SUCCESS);
}
}
RWUNLOCK(&view->sfd_lock, isc_rwlocktype_write);
}
void
dns_view_sfd_find(dns_view_t *view, const dns_name_t *name,
dns_name_t *foundname) {
REQUIRE(DNS_VIEW_VALID(view));
if (view->sfd != NULL) {
isc_result_t result;
void *data = NULL;
RWLOCK(&view->sfd_lock, isc_rwlocktype_read);
result = dns_rbt_findname(view->sfd, name, 0, foundname, &data);
RWUNLOCK(&view->sfd_lock, isc_rwlocktype_read);
if (result != ISC_R_SUCCESS && result != DNS_R_PARTIALMATCH) {
dns_name_copy(dns_rootname, foundname);
}
} else {
dns_name_copy(dns_rootname, foundname);
}
}
void
dns_view_setmaxrrperset(dns_view_t *view, uint32_t value) {
REQUIRE(DNS_VIEW_VALID(view));
view->maxrrperset = value;
if (view->cache != NULL) {
dns_cache_setmaxrrperset(view->cache, value);
}
}
void
dns_view_setmaxtypepername(dns_view_t *view, uint32_t value) {
REQUIRE(DNS_VIEW_VALID(view));
view->maxtypepername = value;
if (view->cache != NULL) {
dns_cache_setmaxtypepername(view->cache, value);
}
}
void
dns_view_setmaxrestarts(dns_view_t *view, uint8_t max_restarts) {
REQUIRE(DNS_VIEW_VALID(view));
REQUIRE(max_restarts > 0);
view->max_restarts = max_restarts;
}
void
dns_view_setmaxqueries(dns_view_t *view, uint16_t max_queries) {
REQUIRE(DNS_VIEW_VALID(view));
REQUIRE(max_queries > 0);
view->max_queries = max_queries;
}
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