lib/dns/view.c

	view.c revision 132a57117978816eebf6f8c33b39bdcfcd62fd7a
/*
 * Copyright (C) 2004-2015  Internet Systems Consortium, Inc. ("ISC")
 * Copyright (C) 1999-2003  Internet Software Consortium.
 *
 * Permission to use, copy, modify, and/or distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
 * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
 * AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
 * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
 * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
 * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
 * PERFORMANCE OF THIS SOFTWARE.
 */

/*! \file */

#include <config.h>

#include <isc/file.h>
#include <isc/hash.h>
#include <isc/lex.h>
#include <isc/print.h>
#include <isc/sha2.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/acache.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/rrl.h>
#include <dns/rbt.h>
#include <dns/rdataset.h>
#include <dns/request.h>
#include <dns/resolver.h>
#include <dns/result.h>
#include <dns/rpz.h>
#include <dns/stats.h>
#include <dns/time.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)  (((v)->attributes & DNS_VIEWATTR_RESSHUTDOWN) != 0)
#define ADBSHUTDOWN(v)  (((v)->attributes & DNS_VIEWATTR_ADBSHUTDOWN) != 0)
#define REQSHUTDOWN(v)  (((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);

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));
    if (view == NULL)
        return (ISC_R_NOMEMORY);

    view->nta_file = NULL;
    view->mctx = NULL;
    isc_mem_attach(mctx, &view->mctx);
    view->name = isc_mem_strdup(mctx, name);
    if (view->name == NULL) {
        result = ISC_R_NOMEMORY;
        goto cleanup_view;
    }

    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);
    if (view->nta_file == NULL) {
        result = ISC_R_NOMEMORY;
        goto cleanup_name;
    }

    result = isc_mutex_init(&view->lock);
    if (result != ISC_R_SUCCESS)
        goto cleanup_name;

    view->zonetable = NULL;
    if (isc_bind9) {
        result = dns_zt_create(mctx, rdclass, &view->zonetable);
        if (result != ISC_R_SUCCESS) {
            UNEXPECTED_ERROR(__FILE__, __LINE__,
                     "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(__FILE__, __LINE__,
                 "dns_fwdtable_create() failed: %s",
                 isc_result_totext(result));
        result = ISC_R_UNEXPECTED;
        goto cleanup_zt;
    }

    view->acache = NULL;
    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 = ISC_FALSE;
    view->task = NULL;
    result = isc_refcount_init(&view->references, 1);
    if (result != ISC_R_SUCCESS)
        goto cleanup_fwdtable;
    view->weakrefs = 0;
    view->attributes = (DNS_VIEWATTR_RESSHUTDOWN|DNS_VIEWATTR_ADBSHUTDOWN|
                DNS_VIEWATTR_REQSHUTDOWN);
    view->statickeys = NULL;
    view->dynamickeys = NULL;
    view->matchclients = NULL;
    view->matchdestinations = NULL;
    view->matchrecursiveonly = ISC_FALSE;
    result = dns_tsigkeyring_create(view->mctx, &view->dynamickeys);
    if (result != ISC_R_SUCCESS)
        goto cleanup_references;
    view->peers = NULL;
    view->order = NULL;
    view->delonly = NULL;
    view->rootdelonly = ISC_FALSE;
    view->rootexclude = NULL;
    view->adbstats = NULL;
    view->resstats = NULL;
    view->resquerystats = NULL;
    view->cacheshared = ISC_FALSE;
    ISC_LIST_INIT(view->dns64);
    view->dns64cnt = 0;

    /*
     * Initialize configuration data with default values.
     */
    view->recursion = ISC_TRUE;
    view->auth_nxdomain = ISC_FALSE; /* Was true in BIND 8 */
    view->additionalfromcache = ISC_TRUE;
    view->additionalfromauth = ISC_TRUE;
    view->enablednssec = ISC_TRUE;
    view->enablevalidation = ISC_TRUE;
    view->acceptexpired = ISC_FALSE;
    view->minimalresponses = ISC_FALSE;
    view->transfer_format = dns_one_answer;
    view->cacheacl = NULL;
    view->cacheonacl = NULL;
    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 = ISC_TRUE;
    view->answeracl_exclude = NULL;
    view->denyanswernames = NULL;
    view->answernames_exclude = NULL;
    view->rrl = NULL;
    view->provideixfr = ISC_TRUE;
    view->maxcachettl = 7 * 24 * 3600;
    view->maxncachettl = 3 * 3600;
    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 = ISC_FALSE;
    view->dlv = NULL;
    view->maxudp = 0;
    view->nocookieudp = 0;
    view->maxbits = 0;
    view->v4_aaaa = dns_aaaa_ok;
    view->v6_aaaa = dns_aaaa_ok;
    view->aaaa_acl = NULL;
    view->rpzs = NULL;
    dns_fixedname_init(&view->dlv_fixed);
    view->managed_keys = NULL;
    view->redirect = NULL;
    view->redirectzone = NULL;
    dns_fixedname_init(&view->redirectfixed);
    view->requestnsid = ISC_FALSE;
    view->sendcookie = ISC_TRUE;
    view->requireservercookie = ISC_FALSE;
    view->new_zone_file = NULL;
    view->new_zone_config = NULL;
    view->cfg_destroy = NULL;
    view->fail_ttl = 0;
    view->failcache = NULL;
    view->v6bias = 0;
    dns_badcache_init(view->mctx, DNS_VIEW_FAILCACHESIZE, &view->failcache);
    view->dtenv = NULL;
    view->dttypes = 0;

    if (isc_bind9) {
        result = dns_order_create(view->mctx, &view->order);
        if (result != ISC_R_SUCCESS)
            goto cleanup_dynkeys;
    }

    result = dns_peerlist_new(view->mctx, &view->peers);
    if (result != ISC_R_SUCCESS)
        goto cleanup_order;

    result = dns_aclenv_init(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_dynkeys:
    if (view->dynamickeys != NULL)
        dns_tsigkeyring_detach(&view->dynamickeys);

 cleanup_references:
    isc_refcount_destroy(&view->references);

 cleanup_fwdtable:
    if (view->fwdtable != NULL)
        dns_fwdtable_destroy(&view->fwdtable);

 cleanup_zt:
    if (view->zonetable != NULL)
        dns_zt_detach(&view->zonetable);

 cleanup_mutex:
    DESTROYLOCK(&view->lock);

    if (view->nta_file != NULL)
        isc_mem_free(mctx, view->nta_file);

 cleanup_name:
    isc_mem_free(mctx, view->name);

 cleanup_view:
    isc_mem_putanddetach(&view->mctx, view, sizeof(*view));

    return (result);
}

static inline void
destroy(dns_view_t *view) {
    dns_dns64_t *dns64;
    dns_dlzdb_t *dlzdb;

    REQUIRE(!ISC_LINK_LINKED(view, link));
    REQUIRE(isc_refcount_current(&view->references) == 0);
    REQUIRE(view->weakrefs == 0);
    REQUIRE(RESSHUTDOWN(view));
    REQUIRE(ADBSHUTDOWN(view));
    REQUIRE(REQSHUTDOWN(view));

    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[20];
        char keyfile[20];
        FILE *fp = NULL;
        int n;

        n = snprintf(keyfile, sizeof(keyfile), "%s.tsigkeys",
                 view->name);
        if (n > 0 && (size_t)n < sizeof(keyfile)) {
            result = isc_file_mktemplate(keyfile, 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_rename(template,
                                 keyfile);
                if (result != ISC_R_SUCCESS)
                    (void)remove(template);
            } else {
                (void)fclose(fp);
                (void)remove(template);
            }
        }
    }
    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);
    if (view->acache != NULL) {
        if (view->cachedb != NULL)
            dns_acache_putdb(view->acache, view->cachedb);
        dns_acache_detach(&view->acache);
    }
    dns_rrl_view_destroy(view);
    if (view->rpzs != NULL)
        dns_rpz_detach_rpzs(&view->rpzs);
    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->aaaa_acl != NULL)
        dns_acl_detach(&view->aaaa_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->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, ISC_FALSE, NULL, NULL);
    dns_fwdtable_destroy(&view->fwdtable);
    dns_aclenv_destroy(&view->aclenv);
    dns_badcache_destroy(&view->failcache);
    DESTROYLOCK(&view->lock);
    isc_refcount_destroy(&view->references);
    isc_mem_free(view->mctx, view->nta_file);
    isc_mem_free(view->mctx, view->name);
    isc_mem_putanddetach(&view->mctx, view, sizeof(*view));
}

/*
 * Return true iff 'view' may be freed.
 * The caller must be holding the view lock.
 */
static isc_boolean_t
all_done(dns_view_t *view) {

    if (isc_refcount_current(&view->references) == 0 &&
        view->weakrefs == 0 &&
        RESSHUTDOWN(view) && ADBSHUTDOWN(view) && REQSHUTDOWN(view))
        return (ISC_TRUE);

    return (ISC_FALSE);
}

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, NULL);

    *targetp = source;
}

static void
view_flushanddetach(dns_view_t **viewp, isc_boolean_t flush) {
    dns_view_t *view;
    unsigned int refs;
    isc_boolean_t done = ISC_FALSE;

    REQUIRE(viewp != NULL);
    view = *viewp;
    REQUIRE(DNS_VIEW_VALID(view));

    if (flush)
        view->flush = ISC_TRUE;
    isc_refcount_decrement(&view->references, &refs);
    if (refs == 0) {
        dns_zone_t *mkzone = NULL, *rdzone = NULL;

        LOCK(&view->lock);
        if (!RESSHUTDOWN(view))
            dns_resolver_shutdown(view->resolver);
        if (!ADBSHUTDOWN(view))
            dns_adb_shutdown(view->adb);
        if (!REQSHUTDOWN(view))
            dns_requestmgr_shutdown(view->requestmgr);
        if (view->acache != NULL)
            dns_acache_shutdown(view->acache);
        if (view->zonetable != NULL) {
            if (view->flush)
                dns_zt_flushanddetach(&view->zonetable);
            else
                dns_zt_detach(&view->zonetable);
        }
        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);
        }
        done = all_done(view);
        UNLOCK(&view->lock);

        /* Need to detach zones outside view lock */
        if (mkzone != NULL)
            dns_zone_detach(&mkzone);

        if (rdzone != NULL)
            dns_zone_detach(&rdzone);
    }

    *viewp = NULL;

    if (done)
        destroy(view);
}

void
dns_view_flushanddetach(dns_view_t **viewp) {
    view_flushanddetach(viewp, ISC_TRUE);
}

void
dns_view_detach(dns_view_t **viewp) {
    view_flushanddetach(viewp, ISC_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_FALSE, dialup, NULL);
}

void
dns_view_weakattach(dns_view_t *source, dns_view_t **targetp) {

    REQUIRE(DNS_VIEW_VALID(source));
    REQUIRE(targetp != NULL && *targetp == NULL);

    LOCK(&source->lock);
    source->weakrefs++;
    UNLOCK(&source->lock);

    *targetp = source;
}

void
dns_view_weakdetach(dns_view_t **viewp) {
    dns_view_t *view;
    isc_boolean_t done = ISC_FALSE;

    REQUIRE(viewp != NULL);
    view = *viewp;
    REQUIRE(DNS_VIEW_VALID(view));

    LOCK(&view->lock);

    INSIST(view->weakrefs > 0);
    view->weakrefs--;
    done = all_done(view);

    UNLOCK(&view->lock);

    *viewp = NULL;

    if (done)
        destroy(view);
}

static void
resolver_shutdown(isc_task_t *task, isc_event_t *event) {
    dns_view_t *view = event->ev_arg;
    isc_boolean_t done;

    REQUIRE(event->ev_type == DNS_EVENT_VIEWRESSHUTDOWN);
    REQUIRE(DNS_VIEW_VALID(view));
    REQUIRE(view->task == task);

    UNUSED(task);

    isc_event_free(&event);

    LOCK(&view->lock);

    view->attributes |= DNS_VIEWATTR_RESSHUTDOWN;
    done = all_done(view);

    UNLOCK(&view->lock);

    if (done)
        destroy(view);
}

static void
adb_shutdown(isc_task_t *task, isc_event_t *event) {
    dns_view_t *view = event->ev_arg;
    isc_boolean_t done;

    REQUIRE(event->ev_type == DNS_EVENT_VIEWADBSHUTDOWN);
    REQUIRE(DNS_VIEW_VALID(view));
    REQUIRE(view->task == task);

    UNUSED(task);

    isc_event_free(&event);

    LOCK(&view->lock);

    view->attributes |= DNS_VIEWATTR_ADBSHUTDOWN;
    done = all_done(view);

    UNLOCK(&view->lock);

    if (done)
        destroy(view);
}

static void
req_shutdown(isc_task_t *task, isc_event_t *event) {
    dns_view_t *view = event->ev_arg;
    isc_boolean_t done;

    REQUIRE(event->ev_type == DNS_EVENT_VIEWREQSHUTDOWN);
    REQUIRE(DNS_VIEW_VALID(view));
    REQUIRE(view->task == task);

    UNUSED(task);

    isc_event_free(&event);

    LOCK(&view->lock);

    view->attributes |= DNS_VIEWATTR_REQSHUTDOWN;
    done = all_done(view);

    UNLOCK(&view->lock);

    if (done)
        destroy(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_socketmgr_t *socketmgr,
            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, socketmgr,
                     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);
    view->attributes &= ~DNS_VIEWATTR_RESSHUTDOWN;

    result = isc_mem_create(0, 0, &mctx);
    if (result != ISC_R_SUCCESS) {
        dns_resolver_shutdown(view->resolver);
        return (result);
    }

    result = dns_adb_create(mctx, view, timermgr, taskmgr, &view->adb);
    isc_mem_setname(mctx, "ADB", NULL);
    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);
    view->attributes &= ~DNS_VIEWATTR_ADBSHUTDOWN;

    result = dns_requestmgr_create(view->mctx, timermgr, socketmgr,
                      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);
    view->attributes &= ~DNS_VIEWATTR_REQSHUTDOWN;

    return (ISC_R_SUCCESS);
}

void
dns_view_setcache(dns_view_t *view, dns_cache_t *cache) {
    dns_view_setcache2(view, cache, ISC_FALSE);
}

void
dns_view_setcache2(dns_view_t *view, dns_cache_t *cache, isc_boolean_t shared) {
    REQUIRE(DNS_VIEW_VALID(view));
    REQUIRE(!view->frozen);

    view->cacheshared = shared;
    if (view->cache != NULL) {
        if (view->acache != NULL)
            dns_acache_putdb(view->acache, view->cachedb);
        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));

    if (view->acache != NULL)
        dns_acache_setdb(view->acache, view->cachedb);
}

isc_boolean_t
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_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[20];
    int n;

    REQUIRE(DNS_VIEW_VALID(view));

    if (view->dynamickeys != NULL) {
        n = snprintf(keyfile, sizeof(keyfile), "%s.tsigkeys",
                 view->name);
        if (n > 0 && (size_t)n < sizeof(keyfile)) {
            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 = ISC_TRUE;
}

void
dns_view_thaw(dns_view_t *view) {
    REQUIRE(DNS_VIEW_VALID(view));
    REQUIRE(view->frozen);

    view->frozen = ISC_FALSE;
}

isc_result_t
dns_view_addzone(dns_view_t *view, dns_zone_t *zone) {
    isc_result_t result;

    REQUIRE(DNS_VIEW_VALID(view));
    REQUIRE(!view->frozen);
    REQUIRE(view->zonetable != NULL);

    result = dns_zt_mount(view->zonetable, zone);

    return (result);
}

isc_result_t
dns_view_findzone(dns_view_t *view, 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, 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) {
    return (dns_view_find2(view, name, type, now, options, use_hints,
                   ISC_FALSE, dbp, nodep, foundname, rdataset,
                   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)
{
    isc_result_t result;
    dns_db_t *db, *zdb;
    dns_dbnode_t *node, *znode;
    isc_boolean_t 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 = ISC_FALSE;
    zone = NULL;
    LOCK(&view->lock);
    if (view->zonetable != NULL)
        result = dns_zt_find(view->zonetable, name, 0, 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 = ISC_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 = ISC_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 = ISC_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 && 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, 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)
{
    isc_result_t result;
    dns_fixedname_t foundname;

    dns_fixedname_init(&foundname);
    result = dns_view_find(view, name, type, now, options, use_hints,
                   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, 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)
{
    return(dns_view_findzonecut2(view, name, fname, now, options,
                     use_hints, ISC_TRUE,
                     rdataset, 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)
{
    isc_result_t result;
    dns_db_t *db;
    isc_boolean_t 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 = 0;

    REQUIRE(DNS_VIEW_VALID(view));
    REQUIRE(view->frozen);

    db = NULL;
    use_zone = ISC_FALSE;
    try_hints = ISC_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 {
            /*
             * Maybe we have hints...
             */
            try_hints = ISC_TRUE;
            goto finish;
        }
    } 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;
        if (use_cache && view->cachedb != NULL && db != view->hints) {
            /*
             * We found an answer, but the cache may be better.
             */
            zfname = dns_fixedname_name(&zfixedname);
            result = dns_name_copy(fname, zfname, NULL);
            if (result != ISC_R_SUCCESS)
                goto cleanup;
            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 = ISC_TRUE;
            goto db_find;
        }
    } else {
        result = dns_db_findzonecut(db, name, options, now, NULL,
                        fname, 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 = ISC_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 = ISC_TRUE;
            } else {
                /*
                 * Maybe we have hints...
                 */
                try_hints = ISC_TRUE;
            }
        } 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);
        }
        result = dns_name_copy(zfname, fname, NULL);
        if (result != ISC_R_SUCCESS)
            goto cleanup;
        dns_rdataset_clone(&zrdataset, rdataset);
        if (sigrdataset != NULL &&
            dns_rdataset_isassociated(&zrdataset))
            dns_rdataset_clone(&zsigrdataset, sigrdataset);
    } else if (try_hints && use_hints && view->hints != NULL) {
        /*
         * 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;
        }
    }

 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, dns_name_t *name,
              isc_boolean_t 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 == ISC_FALSE && 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, isc_boolean_t stop) {

    REQUIRE(DNS_VIEW_VALID(view));
    REQUIRE(view->zonetable != NULL);

    return (dns_zt_load(view->zonetable, stop));
}

isc_result_t
dns_view_loadnew(dns_view_t *view, isc_boolean_t stop) {

    REQUIRE(DNS_VIEW_VALID(view));
    REQUIRE(view->zonetable != NULL);

    return (dns_zt_loadnew(view->zonetable, stop));
}

isc_result_t
dns_view_asyncload(dns_view_t *view, dns_zt_allloaded_t callback, void *arg) {
    REQUIRE(DNS_VIEW_VALID(view));
    REQUIRE(view->zonetable != NULL);

    return (dns_zt_asyncload(view->zonetable, callback, arg));
}

isc_result_t
dns_view_gettsig(dns_view_t *view, 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_getpeertsig(dns_view_t *view, 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, 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) {
    return (dns_view_flushcache2(view, ISC_FALSE));
}

isc_result_t
dns_view_flushcache2(dns_view_t *view, isc_boolean_t 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);
    }
    if (view->acache != NULL)
        dns_acache_putdb(view->acache, view->cachedb);
    dns_db_detach(&view->cachedb);
    dns_cache_attachdb(view->cache, &view->cachedb);
    if (view->acache != NULL)
        dns_acache_setdb(view->acache, 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, dns_name_t *name) {
    return (dns_view_flushnode(view, name, ISC_FALSE));
}

isc_result_t
dns_view_flushnode(dns_view_t *view, dns_name_t *name, isc_boolean_t 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);
}

isc_result_t
dns_view_adddelegationonly(dns_view_t *view, dns_name_t *name) {
    isc_result_t result;
    dns_name_t *new;
    isc_uint32_t hash;

    REQUIRE(DNS_VIEW_VALID(view));

    if (view->delonly == NULL) {
        view->delonly = isc_mem_get(view->mctx,
                        sizeof(dns_namelist_t) *
                        DNS_VIEW_DELONLYHASH);
        if (view->delonly == NULL)
            return (ISC_R_NOMEMORY);
        for (hash = 0; hash < DNS_VIEW_DELONLYHASH; hash++)
            ISC_LIST_INIT(view->delonly[hash]);
    }
    hash = dns_name_hash(name, ISC_FALSE) % DNS_VIEW_DELONLYHASH;
    new = ISC_LIST_HEAD(view->delonly[hash]);
    while (new != NULL && !dns_name_equal(new, name))
        new = ISC_LIST_NEXT(new, link);
    if (new != NULL)
        return (ISC_R_SUCCESS);
    new = isc_mem_get(view->mctx, sizeof(*new));
    if (new == NULL)
        return (ISC_R_NOMEMORY);
    dns_name_init(new, NULL);
    result = dns_name_dup(name, view->mctx, new);
    if (result == ISC_R_SUCCESS)
        ISC_LIST_APPEND(view->delonly[hash], new, link);
    else
        isc_mem_put(view->mctx, new, sizeof(*new));
    return (result);
}

isc_result_t
dns_view_excludedelegationonly(dns_view_t *view, dns_name_t *name) {
    isc_result_t result;
    dns_name_t *new;
    isc_uint32_t hash;

    REQUIRE(DNS_VIEW_VALID(view));

    if (view->rootexclude == NULL) {
        view->rootexclude = isc_mem_get(view->mctx,
                        sizeof(dns_namelist_t) *
                        DNS_VIEW_DELONLYHASH);
        if (view->rootexclude == NULL)
            return (ISC_R_NOMEMORY);
        for (hash = 0; hash < DNS_VIEW_DELONLYHASH; hash++)
            ISC_LIST_INIT(view->rootexclude[hash]);
    }
    hash = dns_name_hash(name, ISC_FALSE) % DNS_VIEW_DELONLYHASH;
    new = ISC_LIST_HEAD(view->rootexclude[hash]);
    while (new != NULL && !dns_name_equal(new, name))
        new = ISC_LIST_NEXT(new, link);
    if (new != NULL)
        return (ISC_R_SUCCESS);
    new = isc_mem_get(view->mctx, sizeof(*new));
    if (new == NULL)
        return (ISC_R_NOMEMORY);
    dns_name_init(new, NULL);
    result = dns_name_dup(name, view->mctx, new);
    if (result == ISC_R_SUCCESS)
        ISC_LIST_APPEND(view->rootexclude[hash], new, link);
    else
        isc_mem_put(view->mctx, new, sizeof(*new));
    return (result);
}

isc_boolean_t
dns_view_isdelegationonly(dns_view_t *view, dns_name_t *name) {
    dns_name_t *new;
    isc_uint32_t hash;

    REQUIRE(DNS_VIEW_VALID(view));

    if (!view->rootdelonly && view->delonly == NULL)
        return (ISC_FALSE);

    hash = dns_name_hash(name, ISC_FALSE) % DNS_VIEW_DELONLYHASH;
    if (view->rootdelonly && dns_name_countlabels(name) <= 2) {
        if (view->rootexclude == NULL)
            return (ISC_TRUE);
        new = ISC_LIST_HEAD(view->rootexclude[hash]);
        while (new != NULL && !dns_name_equal(new, name))
            new = ISC_LIST_NEXT(new, link);
        if (new == NULL)
            return (ISC_TRUE);
    }

    if (view->delonly == NULL)
        return (ISC_FALSE);

    new = ISC_LIST_HEAD(view->delonly[hash]);
    while (new != NULL && !dns_name_equal(new, name))
        new = ISC_LIST_NEXT(new, link);
    if (new == NULL)
        return (ISC_FALSE);
    return (ISC_TRUE);
}

void
dns_view_setrootdelonly(dns_view_t *view, isc_boolean_t value) {
    REQUIRE(DNS_VIEW_VALID(view));
    view->rootdelonly = value;
}

isc_boolean_t
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, isc_boolean_t value) {

    REQUIRE(DNS_VIEW_VALID(view));
    REQUIRE(view->zonetable != NULL);

    return (dns_zt_freezezones(view->zonetable, 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);
}

isc_boolean_t
dns_view_ntacovers(dns_view_t *view, isc_stdtime_t now,
           dns_name_t *name, dns_name_t *anchor)
{
    REQUIRE(DNS_VIEW_VALID(view));

    if (view->ntatable_priv == NULL)
        return (ISC_FALSE);

    return (dns_ntatable_covered(view->ntatable_priv, now, name, anchor));
}

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)
{
    isc_result_t result;
    isc_boolean_t secure = ISC_FALSE;
    dns_fixedname_t fn;
    dns_name_t *anchor;

    REQUIRE(DNS_VIEW_VALID(view));

    if (view->secroots_priv == NULL)
        return (ISC_R_NOTFOUND);

    dns_fixedname_init(&fn);
    anchor = dns_fixedname_name(&fn);

    result = dns_keytable_issecuredomain(view->secroots_priv, name,
                         anchor, &secure);
    if (result != ISC_R_SUCCESS)
        return (result);

    if (checknta && secure && view->ntatable_priv != NULL &&
        dns_ntatable_covered(view->ntatable_priv, now, name, anchor))
        secure = ISC_FALSE;

    *secure_domain = secure;
    return (ISC_R_SUCCESS);
}

void
dns_view_untrust(dns_view_t *view, dns_name_t *keyname,
         dns_rdata_dnskey_t *dnskey, isc_mem_t *mctx)
{
    isc_result_t result;
    unsigned char data[4096];
    dns_rdata_t rdata = DNS_RDATA_INIT;
    isc_buffer_t buffer;
    dst_key_t *key = NULL;
    dns_keytable_t *sr = NULL;

    /*
     * Clear the revoke bit, if set, so that the key will match what's
     * in secroots now.
     */
    dnskey->flags &= ~DNS_KEYFLAG_REVOKE;

    /* Convert dnskey to DST key. */
    isc_buffer_init(&buffer, data, sizeof(data));
    dns_rdata_fromstruct(&rdata, dnskey->common.rdclass,
                 dns_rdatatype_dnskey, dnskey, &buffer);
    result = dns_dnssec_keyfromrdata(keyname, &rdata, mctx, &key);
    if (result != ISC_R_SUCCESS)
        return;
    result = dns_view_getsecroots(view, &sr);
    if (result == ISC_R_SUCCESS) {
        dns_keytable_deletekeynode(sr, key);
        dns_keytable_marksecure(sr, keyname);
        dns_keytable_detach(&sr);
    }
    dst_key_free(&key);
}

void
dns_view_setnewzones(dns_view_t *view, isc_boolean_t allow, void *cfgctx,
             void (*cfg_destroy)(void **))
{
    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;
    }

    if (view->new_zone_config != NULL) {
        view->cfg_destroy(&view->new_zone_config);
        view->cfg_destroy = NULL;
    }

    if (allow) {
        isc_result_t result;
        char buffer[1024];

        result = isc_file_sanitize(NULL, view->name, "nzf",
                       buffer, sizeof(buffer));
        if (result == ISC_R_SUCCESS) {
            view->new_zone_file = isc_mem_strdup(view->mctx,
                                 buffer);
            view->new_zone_config = cfgctx;
            view->cfg_destroy = cfg_destroy;
        }
    }
}

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)
{
    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 */
    dns_fixedname_init(&fname);
    zonename = dns_fixedname_name(&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) {
                result = dns_name_copy(name, zonename, NULL);
                if (result != ISC_R_SUCCESS)
                    return (result);
            } 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);
}

isc_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, isc_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;
    isc_boolean_t removefile = ISC_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 = ISC_TRUE;
        result = ISC_R_SUCCESS;
        goto cleanup;
    } else
        CHECK(result);

    result = dns_ntatable_save(ntatable, fp);
    if (result == ISC_R_NOTFOUND) {
        removefile = ISC_TRUE;
        result = ISC_R_SUCCESS;
    }

 cleanup:
    if (ntatable != NULL)
        dns_ntatable_detach(&ntatable);

    if (fp != NULL)
        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;
        dns_name_t *ntaname;
        isc_buffer_t b;
        isc_stdtime_t t;
        isc_boolean_t 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_fixedname_init(&fn);
            ntaname = dns_fixedname_name(&fn);

            isc_buffer_init(&b, name, (unsigned int)len);
            isc_buffer_add(&b, (unsigned int)len);
            CHECK(dns_name_fromtext(ntaname, &b, dns_rootname,
                        0, NULL));
        }

        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 = ISC_FALSE;
        else if (strcmp(type, "forced") == 0)
            forced = ISC_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);
}