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-rw-r--r--lib/dns/nta.c722
1 files changed, 722 insertions, 0 deletions
diff --git a/lib/dns/nta.c b/lib/dns/nta.c
new file mode 100644
index 0000000..41e219b
--- /dev/null
+++ b/lib/dns/nta.c
@@ -0,0 +1,722 @@
+/*
+ * Copyright (C) Internet Systems Consortium, Inc. ("ISC")
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * See the COPYRIGHT file distributed with this work for additional
+ * information regarding copyright ownership.
+ */
+
+/*! \file */
+
+#include <config.h>
+
+#include <inttypes.h>
+#include <stdbool.h>
+
+#include <isc/buffer.h>
+#include <isc/log.h>
+#include <isc/mem.h>
+#include <isc/print.h>
+#include <isc/rwlock.h>
+#include <isc/string.h>
+#include <isc/task.h>
+#include <isc/time.h>
+#include <isc/timer.h>
+#include <isc/util.h>
+
+#include <dns/db.h>
+#include <dns/log.h>
+#include <dns/nta.h>
+#include <dns/fixedname.h>
+#include <dns/name.h>
+#include <dns/rbt.h>
+#include <dns/rdataset.h>
+#include <dns/resolver.h>
+#include <dns/result.h>
+#include <dns/time.h>
+
+struct dns_nta {
+ unsigned int magic;
+ isc_refcount_t refcount;
+ dns_ntatable_t *ntatable;
+ bool forced;
+ isc_timer_t *timer;
+ dns_fetch_t *fetch;
+ dns_rdataset_t rdataset;
+ dns_rdataset_t sigrdataset;
+ dns_fixedname_t fn;
+ dns_name_t *name;
+ isc_stdtime_t expiry;
+};
+
+#define NTA_MAGIC ISC_MAGIC('N', 'T', 'A', 'n')
+#define VALID_NTA(nn) ISC_MAGIC_VALID(nn, NTA_MAGIC)
+
+/*
+ * Obtain a reference to the nta object. Released by
+ * nta_detach.
+ */
+static void
+nta_ref(dns_nta_t *nta) {
+ isc_refcount_increment(&nta->refcount, NULL);
+}
+
+static void
+nta_detach(isc_mem_t *mctx, dns_nta_t **ntap) {
+ unsigned int refs;
+ dns_nta_t *nta = *ntap;
+
+ REQUIRE(VALID_NTA(nta));
+
+ *ntap = NULL;
+ isc_refcount_decrement(&nta->refcount, &refs);
+ if (refs == 0) {
+ nta->magic = 0;
+ if (nta->timer != NULL) {
+ (void) isc_timer_reset(nta->timer,
+ isc_timertype_inactive,
+ NULL, NULL, true);
+ isc_timer_detach(&nta->timer);
+ }
+ isc_refcount_destroy(&nta->refcount);
+ if (dns_rdataset_isassociated(&nta->rdataset))
+ dns_rdataset_disassociate(&nta->rdataset);
+ if (dns_rdataset_isassociated(&nta->sigrdataset))
+ dns_rdataset_disassociate(&nta->sigrdataset);
+ if (nta->fetch != NULL) {
+ dns_resolver_cancelfetch(nta->fetch);
+ dns_resolver_destroyfetch(&nta->fetch);
+ }
+ isc_mem_put(mctx, nta, sizeof(dns_nta_t));
+ }
+}
+
+static void
+free_nta(void *data, void *arg) {
+ dns_nta_t *nta = (dns_nta_t *) data;
+ isc_mem_t *mctx = (isc_mem_t *) arg;
+
+ nta_detach(mctx, &nta);
+}
+
+isc_result_t
+dns_ntatable_create(dns_view_t *view,
+ isc_taskmgr_t *taskmgr, isc_timermgr_t *timermgr,
+ dns_ntatable_t **ntatablep)
+{
+ dns_ntatable_t *ntatable;
+ isc_result_t result;
+
+ REQUIRE(ntatablep != NULL && *ntatablep == NULL);
+
+ ntatable = isc_mem_get(view->mctx, sizeof(*ntatable));
+ if (ntatable == NULL)
+ return (ISC_R_NOMEMORY);
+
+ ntatable->task = NULL;
+ result = isc_task_create(taskmgr, 0, &ntatable->task);
+ if (result != ISC_R_SUCCESS)
+ goto cleanup_ntatable;
+ isc_task_setname(ntatable->task, "ntatable", ntatable);
+
+ ntatable->table = NULL;
+ result = dns_rbt_create(view->mctx, free_nta, view->mctx,
+ &ntatable->table);
+ if (result != ISC_R_SUCCESS)
+ goto cleanup_task;
+
+ result = isc_rwlock_init(&ntatable->rwlock, 0, 0);
+ if (result != ISC_R_SUCCESS)
+ goto cleanup_rbt;
+
+ ntatable->timermgr = timermgr;
+ ntatable->taskmgr = taskmgr;
+
+ ntatable->view = view;
+ ntatable->references = 1;
+
+ ntatable->magic = NTATABLE_MAGIC;
+ *ntatablep = ntatable;
+
+ return (ISC_R_SUCCESS);
+
+ cleanup_rbt:
+ dns_rbt_destroy(&ntatable->table);
+
+ cleanup_task:
+ isc_task_detach(&ntatable->task);
+
+ cleanup_ntatable:
+ isc_mem_put(ntatable->view->mctx, ntatable, sizeof(*ntatable));
+
+ return (result);
+}
+
+void
+dns_ntatable_attach(dns_ntatable_t *source, dns_ntatable_t **targetp) {
+ REQUIRE(VALID_NTATABLE(source));
+ REQUIRE(targetp != NULL && *targetp == NULL);
+
+ RWLOCK(&source->rwlock, isc_rwlocktype_write);
+
+ INSIST(source->references > 0);
+ source->references++;
+ INSIST(source->references != 0);
+
+ RWUNLOCK(&source->rwlock, isc_rwlocktype_write);
+
+ *targetp = source;
+}
+
+void
+dns_ntatable_detach(dns_ntatable_t **ntatablep) {
+ bool destroy = false;
+ dns_ntatable_t *ntatable;
+
+ REQUIRE(ntatablep != NULL && VALID_NTATABLE(*ntatablep));
+
+ ntatable = *ntatablep;
+ *ntatablep = NULL;
+
+ RWLOCK(&ntatable->rwlock, isc_rwlocktype_write);
+ INSIST(ntatable->references > 0);
+ ntatable->references--;
+ if (ntatable->references == 0)
+ destroy = true;
+ RWUNLOCK(&ntatable->rwlock, isc_rwlocktype_write);
+
+ if (destroy) {
+ dns_rbt_destroy(&ntatable->table);
+ isc_rwlock_destroy(&ntatable->rwlock);
+ if (ntatable->task != NULL)
+ isc_task_detach(&ntatable->task);
+ ntatable->timermgr = NULL;
+ ntatable->taskmgr = NULL;
+ ntatable->magic = 0;
+ isc_mem_put(ntatable->view->mctx, ntatable, sizeof(*ntatable));
+ }
+}
+
+static void
+fetch_done(isc_task_t *task, isc_event_t *event) {
+ dns_fetchevent_t *devent = (dns_fetchevent_t *)event;
+ dns_nta_t *nta = devent->ev_arg;
+ isc_result_t eresult = devent->result;
+ dns_ntatable_t *ntatable = nta->ntatable;
+ dns_view_t *view = ntatable->view;
+ isc_stdtime_t now;
+
+ UNUSED(task);
+
+ if (dns_rdataset_isassociated(&nta->rdataset))
+ dns_rdataset_disassociate(&nta->rdataset);
+ if (dns_rdataset_isassociated(&nta->sigrdataset))
+ dns_rdataset_disassociate(&nta->sigrdataset);
+ if (nta->fetch == devent->fetch)
+ nta->fetch = NULL;
+ dns_resolver_destroyfetch(&devent->fetch);
+
+ if (devent->node != NULL)
+ dns_db_detachnode(devent->db, &devent->node);
+ if (devent->db != NULL)
+ dns_db_detach(&devent->db);
+
+ isc_event_free(&event);
+ isc_stdtime_get(&now);
+
+ switch (eresult) {
+ case ISC_R_SUCCESS:
+ case DNS_R_NCACHENXDOMAIN:
+ case DNS_R_NXDOMAIN:
+ case DNS_R_NCACHENXRRSET:
+ case DNS_R_NXRRSET:
+ if (nta->expiry > now)
+ nta->expiry = now;
+ break;
+ default:
+ break;
+ }
+
+ /*
+ * If we're expiring before the next recheck, we might
+ * as well stop the timer now.
+ */
+ if (nta->timer != NULL && nta->expiry - now < view->nta_recheck)
+ (void) isc_timer_reset(nta->timer, isc_timertype_inactive,
+ NULL, NULL, true);
+ nta_detach(view->mctx, &nta);
+}
+
+static void
+checkbogus(isc_task_t *task, isc_event_t *event) {
+ dns_nta_t *nta = event->ev_arg;
+ dns_ntatable_t *ntatable = nta->ntatable;
+ dns_view_t *view = ntatable->view;
+ isc_result_t result;
+
+ if (nta->fetch != NULL) {
+ dns_resolver_cancelfetch(nta->fetch);
+ nta->fetch = NULL;
+ }
+ if (dns_rdataset_isassociated(&nta->rdataset))
+ dns_rdataset_disassociate(&nta->rdataset);
+ if (dns_rdataset_isassociated(&nta->sigrdataset))
+ dns_rdataset_disassociate(&nta->sigrdataset);
+
+ isc_event_free(&event);
+
+ nta_ref(nta);
+ result = dns_resolver_createfetch(view->resolver, nta->name,
+ dns_rdatatype_nsec,
+ NULL, NULL, NULL,
+ DNS_FETCHOPT_NONTA,
+ task, fetch_done, nta,
+ &nta->rdataset,
+ &nta->sigrdataset,
+ &nta->fetch);
+ if (result != ISC_R_SUCCESS)
+ nta_detach(view->mctx, &nta);
+}
+
+static isc_result_t
+settimer(dns_ntatable_t *ntatable, dns_nta_t *nta, uint32_t lifetime) {
+ isc_result_t result;
+ isc_interval_t interval;
+ dns_view_t *view;
+
+ REQUIRE(VALID_NTATABLE(ntatable));
+ REQUIRE(VALID_NTA(nta));
+
+ if (ntatable->timermgr == NULL)
+ return (ISC_R_SUCCESS);
+
+ view = ntatable->view;
+ if (view->nta_recheck == 0 || lifetime <= view->nta_recheck)
+ return (ISC_R_SUCCESS);
+
+ isc_interval_set(&interval, view->nta_recheck, 0);
+ result = isc_timer_create(ntatable->timermgr, isc_timertype_ticker,
+ NULL, &interval, ntatable->task,
+ checkbogus, nta, &nta->timer);
+ return (result);
+}
+
+static isc_result_t
+nta_create(dns_ntatable_t *ntatable, dns_name_t *name, dns_nta_t **target) {
+ isc_result_t result;
+ dns_nta_t *nta = NULL;
+ dns_view_t *view;
+
+ REQUIRE(VALID_NTATABLE(ntatable));
+ REQUIRE(target != NULL && *target == NULL);
+
+ view = ntatable->view;
+
+ nta = isc_mem_get(view->mctx, sizeof(dns_nta_t));
+ if (nta == NULL)
+ return (ISC_R_NOMEMORY);
+
+ nta->ntatable = ntatable;
+ nta->expiry = 0;
+ nta->timer = NULL;
+ nta->fetch = NULL;
+ dns_rdataset_init(&nta->rdataset);
+ dns_rdataset_init(&nta->sigrdataset);
+
+ result = isc_refcount_init(&nta->refcount, 1);
+ if (result != ISC_R_SUCCESS) {
+ isc_mem_put(view->mctx, nta, sizeof(dns_nta_t));
+ return (result);
+ }
+
+ nta->name = dns_fixedname_initname(&nta->fn);
+ dns_name_copy(name, nta->name, NULL);
+
+ nta->magic = NTA_MAGIC;
+
+ *target = nta;
+ return (ISC_R_SUCCESS);
+}
+
+isc_result_t
+dns_ntatable_add(dns_ntatable_t *ntatable, dns_name_t *name,
+ bool force, isc_stdtime_t now,
+ uint32_t lifetime)
+{
+ isc_result_t result;
+ dns_nta_t *nta = NULL;
+ dns_rbtnode_t *node;
+ dns_view_t *view;
+
+ REQUIRE(VALID_NTATABLE(ntatable));
+
+ view = ntatable->view;
+
+ result = nta_create(ntatable, name, &nta);
+ if (result != ISC_R_SUCCESS)
+ return (result);
+
+ nta->expiry = now + lifetime;
+ nta->forced = force;
+
+ RWLOCK(&ntatable->rwlock, isc_rwlocktype_write);
+
+ node = NULL;
+ result = dns_rbt_addnode(ntatable->table, name, &node);
+ if (result == ISC_R_SUCCESS) {
+ if (!force)
+ (void)settimer(ntatable, nta, lifetime);
+ node->data = nta;
+ nta = NULL;
+ } else if (result == ISC_R_EXISTS) {
+ dns_nta_t *n = node->data;
+ if (n == NULL) {
+ if (!force)
+ (void)settimer(ntatable, nta, lifetime);
+ node->data = nta;
+ nta = NULL;
+ } else {
+ n->expiry = nta->expiry;
+ nta_detach(view->mctx, &nta);
+ }
+ result = ISC_R_SUCCESS;
+ }
+
+ RWUNLOCK(&ntatable->rwlock, isc_rwlocktype_write);
+
+ if (nta != NULL)
+ nta_detach(view->mctx, &nta);
+
+ return (result);
+}
+
+/*
+ * Caller must hold a write lock on rwlock.
+ */
+static isc_result_t
+deletenode(dns_ntatable_t *ntatable, const dns_name_t *name) {
+ isc_result_t result;
+ dns_rbtnode_t *node = NULL;
+
+ REQUIRE(VALID_NTATABLE(ntatable));
+ REQUIRE(name != NULL);
+
+ result = dns_rbt_findnode(ntatable->table, name, NULL, &node, NULL,
+ DNS_RBTFIND_NOOPTIONS, NULL, NULL);
+ if (result == ISC_R_SUCCESS) {
+ if (node->data != NULL)
+ result = dns_rbt_deletenode(ntatable->table,
+ node, false);
+ else
+ result = ISC_R_NOTFOUND;
+ } else if (result == DNS_R_PARTIALMATCH)
+ result = ISC_R_NOTFOUND;
+
+ return (result);
+}
+
+isc_result_t
+dns_ntatable_delete(dns_ntatable_t *ntatable, dns_name_t *name) {
+ isc_result_t result;
+
+ RWLOCK(&ntatable->rwlock, isc_rwlocktype_write);
+ result = deletenode(ntatable, name);
+ RWUNLOCK(&ntatable->rwlock, isc_rwlocktype_write);
+
+ return (result);
+}
+
+bool
+dns_ntatable_covered(dns_ntatable_t *ntatable, isc_stdtime_t now,
+ dns_name_t *name, dns_name_t *anchor)
+{
+ isc_result_t result;
+ dns_fixedname_t fn;
+ dns_rbtnode_t *node;
+ dns_name_t *foundname;
+ dns_nta_t *nta = NULL;
+ bool answer = false;
+ isc_rwlocktype_t locktype = isc_rwlocktype_read;
+
+ REQUIRE(ntatable == NULL || VALID_NTATABLE(ntatable));
+ REQUIRE(dns_name_isabsolute(name));
+
+ if (ntatable == NULL)
+ return (false);
+
+ foundname = dns_fixedname_initname(&fn);
+
+ relock:
+ RWLOCK(&ntatable->rwlock, locktype);
+ again:
+ node = NULL;
+ result = dns_rbt_findnode(ntatable->table, name, foundname, &node, NULL,
+ DNS_RBTFIND_NOOPTIONS, NULL, NULL);
+ if (result == DNS_R_PARTIALMATCH) {
+ if (dns_name_issubdomain(foundname, anchor))
+ result = ISC_R_SUCCESS;
+ }
+ if (result == ISC_R_SUCCESS) {
+ nta = (dns_nta_t *) node->data;
+ answer = (nta->expiry > now);
+ }
+
+ /* Deal with expired NTA */
+ if (result == ISC_R_SUCCESS && !answer) {
+ char nb[DNS_NAME_FORMATSIZE];
+
+ if (locktype == isc_rwlocktype_read) {
+ RWUNLOCK(&ntatable->rwlock, locktype);
+ locktype = isc_rwlocktype_write;
+ goto relock;
+ }
+
+ dns_name_format(foundname, nb, sizeof(nb));
+ isc_log_write(dns_lctx, DNS_LOGCATEGORY_DNSSEC,
+ DNS_LOGMODULE_NTA, ISC_LOG_INFO,
+ "deleting expired NTA at %s", nb);
+
+ if (nta->timer != NULL) {
+ (void) isc_timer_reset(nta->timer,
+ isc_timertype_inactive,
+ NULL, NULL, true);
+ isc_timer_detach(&nta->timer);
+ }
+
+ result = deletenode(ntatable, foundname);
+ if (result != ISC_R_SUCCESS) {
+ isc_log_write(dns_lctx, DNS_LOGCATEGORY_DNSSEC,
+ DNS_LOGMODULE_NTA, ISC_LOG_INFO,
+ "deleting NTA failed: %s",
+ isc_result_totext(result));
+ }
+ goto again;
+ }
+ RWUNLOCK(&ntatable->rwlock, locktype);
+
+ return (answer);
+}
+
+static isc_result_t
+putstr(isc_buffer_t **b, const char *str) {
+ isc_result_t result;
+
+ result = isc_buffer_reserve(b, strlen(str));
+ if (result != ISC_R_SUCCESS)
+ return (result);
+
+ isc_buffer_putstr(*b, str);
+ return (ISC_R_SUCCESS);
+}
+
+isc_result_t
+dns_ntatable_totext(dns_ntatable_t *ntatable, isc_buffer_t **buf) {
+ isc_result_t result;
+ dns_rbtnode_t *node;
+ dns_rbtnodechain_t chain;
+ bool first = true;
+ isc_stdtime_t now;
+
+ REQUIRE(VALID_NTATABLE(ntatable));
+
+ isc_stdtime_get(&now);
+
+ RWLOCK(&ntatable->rwlock, isc_rwlocktype_read);
+ dns_rbtnodechain_init(&chain, ntatable->view->mctx);
+ result = dns_rbtnodechain_first(&chain, ntatable->table, NULL, NULL);
+ if (result != ISC_R_SUCCESS && result != DNS_R_NEWORIGIN) {
+ if (result == ISC_R_NOTFOUND)
+ result = ISC_R_SUCCESS;
+ goto cleanup;
+ }
+ for (;;) {
+ dns_rbtnodechain_current(&chain, NULL, NULL, &node);
+ if (node->data != NULL) {
+ dns_nta_t *n = (dns_nta_t *) node->data;
+ char nbuf[DNS_NAME_FORMATSIZE];
+ char tbuf[ISC_FORMATHTTPTIMESTAMP_SIZE];
+ char obuf[DNS_NAME_FORMATSIZE +
+ ISC_FORMATHTTPTIMESTAMP_SIZE +
+ sizeof("expired: \n")];
+ dns_fixedname_t fn;
+ dns_name_t *name;
+ isc_time_t t;
+
+ name = dns_fixedname_initname(&fn);
+ dns_rbt_fullnamefromnode(node, name);
+ dns_name_format(name, nbuf, sizeof(nbuf));
+ isc_time_set(&t, n->expiry, 0);
+ isc_time_formattimestamp(&t, tbuf, sizeof(tbuf));
+
+ snprintf(obuf, sizeof(obuf), "%s%s: %s %s",
+ first ? "" : "\n", nbuf,
+ n->expiry <= now ? "expired" : "expiry",
+ tbuf);
+ first = false;
+ result = putstr(buf, obuf);
+ if (result != ISC_R_SUCCESS)
+ goto cleanup;
+ }
+ result = dns_rbtnodechain_next(&chain, NULL, NULL);
+ if (result != ISC_R_SUCCESS && result != DNS_R_NEWORIGIN) {
+ if (result == ISC_R_NOMORE)
+ result = ISC_R_SUCCESS;
+ break;
+ }
+ }
+
+ cleanup:
+ dns_rbtnodechain_invalidate(&chain);
+ RWUNLOCK(&ntatable->rwlock, isc_rwlocktype_read);
+ return (result);
+}
+
+#if 0
+isc_result_t
+dns_ntatable_dump(dns_ntatable_t *ntatable, FILE *fp) {
+ isc_result_t result;
+ dns_rbtnode_t *node;
+ dns_rbtnodechain_t chain;
+ isc_stdtime_t now;
+
+ REQUIRE(VALID_NTATABLE(ntatable));
+
+ isc_stdtime_get(&now);
+
+ RWLOCK(&ntatable->rwlock, isc_rwlocktype_read);
+ dns_rbtnodechain_init(&chain, ntatable->view->mctx);
+ result = dns_rbtnodechain_first(&chain, ntatable->table, NULL, NULL);
+ if (result != ISC_R_SUCCESS && result != DNS_R_NEWORIGIN)
+ goto cleanup;
+ for (;;) {
+ dns_rbtnodechain_current(&chain, NULL, NULL, &node);
+ if (node->data != NULL) {
+ dns_nta_t *n = (dns_nta_t *) node->data;
+ char nbuf[DNS_NAME_FORMATSIZE], tbuf[80];
+ dns_fixedname_t fn;
+ dns_name_t *name;
+ isc_time_t t;
+
+ name = dns_fixedname_initname(&fn);
+ dns_rbt_fullnamefromnode(node, name);
+ dns_name_format(name, nbuf, sizeof(nbuf));
+ isc_time_set(&t, n->expiry, 0);
+ isc_time_formattimestamp(&t, tbuf, sizeof(tbuf));
+ fprintf(fp, "%s: %s %s\n", nbuf,
+ n->expiry <= now ? "expired" : "expiry",
+ tbuf);
+ }
+ result = dns_rbtnodechain_next(&chain, NULL, NULL);
+ if (result != ISC_R_SUCCESS && result != DNS_R_NEWORIGIN) {
+ if (result == ISC_R_NOMORE)
+ result = ISC_R_SUCCESS;
+ break;
+ }
+ }
+
+ cleanup:
+ dns_rbtnodechain_invalidate(&chain);
+ RWUNLOCK(&ntatable->rwlock, isc_rwlocktype_read);
+ return (result);
+}
+#endif
+
+isc_result_t
+dns_ntatable_dump(dns_ntatable_t *ntatable, FILE *fp) {
+ isc_result_t result;
+ isc_buffer_t *text = NULL;
+ int len = 4096;
+
+ result = isc_buffer_allocate(ntatable->view->mctx, &text, len);
+ if (result != ISC_R_SUCCESS)
+ return (result);
+
+ result = dns_ntatable_totext(ntatable, &text);
+
+ if (isc_buffer_usedlength(text) != 0) {
+ (void) putstr(&text, "\n");
+ } else if (result == ISC_R_SUCCESS) {
+ (void) putstr(&text, "none");
+ } else {
+ (void) putstr(&text, "could not dump NTA table: ");
+ (void) putstr(&text, isc_result_totext(result));
+ }
+
+ fprintf(fp, "%.*s", (int) isc_buffer_usedlength(text),
+ (char *) isc_buffer_base(text));
+ isc_buffer_free(&text);
+ return (result);
+}
+
+isc_result_t
+dns_ntatable_save(dns_ntatable_t *ntatable, FILE *fp) {
+ isc_result_t result;
+ dns_rbtnode_t *node;
+ dns_rbtnodechain_t chain;
+ isc_stdtime_t now;
+ bool written = false;
+
+ REQUIRE(VALID_NTATABLE(ntatable));
+
+ isc_stdtime_get(&now);
+
+ RWLOCK(&ntatable->rwlock, isc_rwlocktype_read);
+ dns_rbtnodechain_init(&chain, ntatable->view->mctx);
+ result = dns_rbtnodechain_first(&chain, ntatable->table, NULL, NULL);
+ if (result != ISC_R_SUCCESS && result != DNS_R_NEWORIGIN)
+ goto cleanup;
+
+ for (;;) {
+ dns_rbtnodechain_current(&chain, NULL, NULL, &node);
+ if (node->data != NULL) {
+ dns_nta_t *n = (dns_nta_t *) node->data;
+ if (n->expiry > now) {
+ isc_buffer_t b;
+ char nbuf[DNS_NAME_FORMATSIZE + 1], tbuf[80];
+ dns_fixedname_t fn;
+ dns_name_t *name;
+
+ name = dns_fixedname_initname(&fn);
+ dns_rbt_fullnamefromnode(node, name);
+
+ isc_buffer_init(&b, nbuf, sizeof(nbuf));
+ result = dns_name_totext(name, false, &b);
+ if (result != ISC_R_SUCCESS)
+ goto skip;
+
+ /* Zero terminate. */
+ isc_buffer_putuint8(&b, 0);
+
+ isc_buffer_init(&b, tbuf, sizeof(tbuf));
+ dns_time32_totext(n->expiry, &b);
+
+ /* Zero terminate. */
+ isc_buffer_putuint8(&b, 0);
+
+ fprintf(fp, "%s %s %s\n", nbuf,
+ n->forced ? "forced" : "regular",
+ tbuf);
+ written = true;
+ }
+ }
+ skip:
+ result = dns_rbtnodechain_next(&chain, NULL, NULL);
+ if (result != ISC_R_SUCCESS && result != DNS_R_NEWORIGIN) {
+ if (result == ISC_R_NOMORE)
+ result = ISC_R_SUCCESS;
+ break;
+ }
+ }
+
+ cleanup:
+ dns_rbtnodechain_invalidate(&chain);
+ RWUNLOCK(&ntatable->rwlock, isc_rwlocktype_read);
+
+ if (result != ISC_R_SUCCESS)
+ return (result);
+ else
+ return (written ? ISC_R_SUCCESS : ISC_R_NOTFOUND);
+}