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-rw-r--r--lib/dns/zt.c601
1 files changed, 601 insertions, 0 deletions
diff --git a/lib/dns/zt.c b/lib/dns/zt.c
new file mode 100644
index 0000000..c84da2f
--- /dev/null
+++ b/lib/dns/zt.c
@@ -0,0 +1,601 @@
+/*
+ * 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/file.h>
+#include <isc/magic.h>
+#include <isc/mem.h>
+#include <isc/string.h>
+#include <isc/task.h>
+#include <isc/util.h>
+
+#include <dns/log.h>
+#include <dns/name.h>
+#include <dns/rbt.h>
+#include <dns/rdataclass.h>
+#include <dns/result.h>
+#include <dns/view.h>
+#include <dns/zone.h>
+#include <dns/zt.h>
+
+struct dns_zt {
+ /* Unlocked. */
+ unsigned int magic;
+ isc_mem_t *mctx;
+ dns_rdataclass_t rdclass;
+ isc_rwlock_t rwlock;
+ dns_zt_allloaded_t loaddone;
+ void * loaddone_arg;
+ /* Locked by lock. */
+ bool flush;
+ uint32_t references;
+ unsigned int loads_pending;
+ dns_rbt_t *table;
+};
+
+#define ZTMAGIC ISC_MAGIC('Z', 'T', 'b', 'l')
+#define VALID_ZT(zt) ISC_MAGIC_VALID(zt, ZTMAGIC)
+
+struct zt_load_params {
+ dns_zt_zoneloaded_t dl;
+ bool newonly;
+ struct dns_zt* zt;
+};
+
+static void
+auto_detach(void *, void *);
+
+static isc_result_t
+load(dns_zone_t *zone, void *uap);
+
+static isc_result_t
+asyncload(dns_zone_t *zone, void *callback);
+
+static isc_result_t
+loadnew(dns_zone_t *zone, void *uap);
+
+static isc_result_t
+freezezones(dns_zone_t *zone, void *uap);
+
+static isc_result_t
+doneloading(dns_zt_t *zt, dns_zone_t *zone, isc_task_t *task);
+
+isc_result_t
+dns_zt_create(isc_mem_t *mctx, dns_rdataclass_t rdclass, dns_zt_t **ztp) {
+ dns_zt_t *zt;
+ isc_result_t result;
+
+ REQUIRE(ztp != NULL && *ztp == NULL);
+
+ zt = isc_mem_get(mctx, sizeof(*zt));
+ if (zt == NULL)
+ return (ISC_R_NOMEMORY);
+
+ zt->table = NULL;
+ result = dns_rbt_create(mctx, auto_detach, zt, &zt->table);
+ if (result != ISC_R_SUCCESS)
+ goto cleanup_zt;
+
+ result = isc_rwlock_init(&zt->rwlock, 0, 0);
+ if (result != ISC_R_SUCCESS)
+ goto cleanup_rbt;
+
+ zt->mctx = NULL;
+ isc_mem_attach(mctx, &zt->mctx);
+ zt->references = 1;
+ zt->flush = false;
+ zt->rdclass = rdclass;
+ zt->magic = ZTMAGIC;
+ zt->loaddone = NULL;
+ zt->loaddone_arg = NULL;
+ zt->loads_pending = 0;
+ *ztp = zt;
+
+ return (ISC_R_SUCCESS);
+
+ cleanup_rbt:
+ dns_rbt_destroy(&zt->table);
+
+ cleanup_zt:
+ isc_mem_put(mctx, zt, sizeof(*zt));
+
+ return (result);
+}
+
+isc_result_t
+dns_zt_mount(dns_zt_t *zt, dns_zone_t *zone) {
+ isc_result_t result;
+ dns_zone_t *dummy = NULL;
+ dns_name_t *name;
+
+ REQUIRE(VALID_ZT(zt));
+
+ name = dns_zone_getorigin(zone);
+
+ RWLOCK(&zt->rwlock, isc_rwlocktype_write);
+
+ result = dns_rbt_addname(zt->table, name, zone);
+ if (result == ISC_R_SUCCESS)
+ dns_zone_attach(zone, &dummy);
+
+ RWUNLOCK(&zt->rwlock, isc_rwlocktype_write);
+
+ return (result);
+}
+
+isc_result_t
+dns_zt_unmount(dns_zt_t *zt, dns_zone_t *zone) {
+ isc_result_t result;
+ dns_name_t *name;
+
+ REQUIRE(VALID_ZT(zt));
+
+ name = dns_zone_getorigin(zone);
+
+ RWLOCK(&zt->rwlock, isc_rwlocktype_write);
+
+ result = dns_rbt_deletename(zt->table, name, false);
+
+ RWUNLOCK(&zt->rwlock, isc_rwlocktype_write);
+
+ return (result);
+}
+
+isc_result_t
+dns_zt_find(dns_zt_t *zt, const dns_name_t *name, unsigned int options,
+ dns_name_t *foundname, dns_zone_t **zonep)
+{
+ isc_result_t result;
+ dns_zone_t *dummy = NULL;
+ unsigned int rbtoptions = 0;
+
+ REQUIRE(VALID_ZT(zt));
+
+ if ((options & DNS_ZTFIND_NOEXACT) != 0)
+ rbtoptions |= DNS_RBTFIND_NOEXACT;
+
+ RWLOCK(&zt->rwlock, isc_rwlocktype_read);
+
+ result = dns_rbt_findname(zt->table, name, rbtoptions, foundname,
+ (void **) (void*)&dummy);
+ if (result == ISC_R_SUCCESS || result == DNS_R_PARTIALMATCH)
+ dns_zone_attach(dummy, zonep);
+
+ RWUNLOCK(&zt->rwlock, isc_rwlocktype_read);
+
+ return (result);
+}
+
+void
+dns_zt_attach(dns_zt_t *zt, dns_zt_t **ztp) {
+
+ REQUIRE(VALID_ZT(zt));
+ REQUIRE(ztp != NULL && *ztp == NULL);
+
+ RWLOCK(&zt->rwlock, isc_rwlocktype_write);
+
+ INSIST(zt->references > 0);
+ zt->references++;
+ INSIST(zt->references != 0);
+
+ RWUNLOCK(&zt->rwlock, isc_rwlocktype_write);
+
+ *ztp = zt;
+}
+
+static isc_result_t
+flush(dns_zone_t *zone, void *uap) {
+ UNUSED(uap);
+ return (dns_zone_flush(zone));
+}
+
+static void
+zt_destroy(dns_zt_t *zt) {
+ if (zt->flush)
+ (void)dns_zt_apply(zt, false, flush, NULL);
+ dns_rbt_destroy(&zt->table);
+ isc_rwlock_destroy(&zt->rwlock);
+ zt->magic = 0;
+ isc_mem_putanddetach(&zt->mctx, zt, sizeof(*zt));
+}
+
+static void
+zt_flushanddetach(dns_zt_t **ztp, bool need_flush) {
+ bool destroy = false;
+ dns_zt_t *zt;
+
+ REQUIRE(ztp != NULL && VALID_ZT(*ztp));
+
+ zt = *ztp;
+
+ RWLOCK(&zt->rwlock, isc_rwlocktype_write);
+
+ INSIST(zt->references > 0);
+ zt->references--;
+ if (zt->references == 0)
+ destroy = true;
+ if (need_flush)
+ zt->flush = true;
+
+ RWUNLOCK(&zt->rwlock, isc_rwlocktype_write);
+
+ if (destroy)
+ zt_destroy(zt);
+
+ *ztp = NULL;
+}
+
+void
+dns_zt_flushanddetach(dns_zt_t **ztp) {
+ zt_flushanddetach(ztp, true);
+}
+
+void
+dns_zt_detach(dns_zt_t **ztp) {
+ zt_flushanddetach(ztp, false);
+}
+
+isc_result_t
+dns_zt_load(dns_zt_t *zt, bool stop) {
+ isc_result_t result;
+
+ REQUIRE(VALID_ZT(zt));
+
+ RWLOCK(&zt->rwlock, isc_rwlocktype_read);
+ result = dns_zt_apply(zt, stop, load, NULL);
+ RWUNLOCK(&zt->rwlock, isc_rwlocktype_read);
+ return (result);
+}
+
+static isc_result_t
+load(dns_zone_t *zone, void *uap) {
+ isc_result_t result;
+ UNUSED(uap);
+
+ result = dns_zone_load(zone);
+ if (result == DNS_R_CONTINUE || result == DNS_R_UPTODATE)
+ result = ISC_R_SUCCESS;
+
+ return (result);
+}
+
+isc_result_t
+dns_zt_asyncload(dns_zt_t *zt, dns_zt_allloaded_t alldone, void *arg) {
+ return (dns_zt_asyncload2(zt, alldone, arg, false));
+}
+
+isc_result_t
+dns_zt_asyncload2(dns_zt_t *zt, dns_zt_allloaded_t alldone, void *arg,
+ bool newonly)
+{
+ isc_result_t result;
+ struct zt_load_params params;
+ params.dl = doneloading;
+ params.newonly = newonly;
+ params.zt = zt;
+ int pending;
+
+ REQUIRE(VALID_ZT(zt));
+
+ RWLOCK(&zt->rwlock, isc_rwlocktype_write);
+
+ INSIST(zt->loads_pending == 0);
+ result = dns_zt_apply2(zt, false, NULL, asyncload, &params);
+
+ pending = zt->loads_pending;
+ if (pending != 0) {
+ zt->loaddone = alldone;
+ zt->loaddone_arg = arg;
+ }
+
+ RWUNLOCK(&zt->rwlock, isc_rwlocktype_write);
+
+ if (pending == 0)
+ alldone(arg);
+
+ return (result);
+}
+
+/*
+ * Initiates asynchronous loading of zone 'zone'. 'callback' is a
+ * pointer to a function which will be used to inform the caller when
+ * the zone loading is complete.
+ */
+static isc_result_t
+asyncload(dns_zone_t *zone, void *paramsv) {
+ isc_result_t result;
+ struct zt_load_params * params = (struct zt_load_params*) paramsv;
+
+ dns_zt_t *zt = params->zt;
+
+ REQUIRE(zone != NULL);
+ zt = dns_zone_getview(zone)->zonetable;
+ INSIST(VALID_ZT(zt));
+
+ INSIST(zt->references > 0);
+ zt->references++;
+ zt->loads_pending++;
+
+ result = dns_zone_asyncload2(zone, *params->dl, zt, params->newonly);
+ if (result != ISC_R_SUCCESS) {
+ zt->references--;
+ zt->loads_pending--;
+ INSIST(zt->references > 0);
+ }
+ return (ISC_R_SUCCESS);
+}
+
+isc_result_t
+dns_zt_loadnew(dns_zt_t *zt, bool stop) {
+ isc_result_t result;
+
+ REQUIRE(VALID_ZT(zt));
+
+ RWLOCK(&zt->rwlock, isc_rwlocktype_read);
+ result = dns_zt_apply(zt, stop, loadnew, NULL);
+ RWUNLOCK(&zt->rwlock, isc_rwlocktype_read);
+ return (result);
+}
+
+static isc_result_t
+loadnew(dns_zone_t *zone, void *uap) {
+ isc_result_t result;
+ UNUSED(uap);
+
+ result = dns_zone_loadnew(zone);
+ if (result == DNS_R_CONTINUE || result == DNS_R_UPTODATE ||
+ result == DNS_R_DYNAMIC)
+ result = ISC_R_SUCCESS;
+ return (result);
+}
+
+isc_result_t
+dns_zt_freezezones(dns_zt_t *zt, bool freeze) {
+ isc_result_t result, tresult;
+
+ REQUIRE(VALID_ZT(zt));
+
+ RWLOCK(&zt->rwlock, isc_rwlocktype_read);
+ result = dns_zt_apply2(zt, false, &tresult, freezezones, &freeze);
+ RWUNLOCK(&zt->rwlock, isc_rwlocktype_read);
+ if (tresult == ISC_R_NOTFOUND)
+ tresult = ISC_R_SUCCESS;
+ return ((result == ISC_R_SUCCESS) ? tresult : result);
+}
+
+static isc_result_t
+freezezones(dns_zone_t *zone, void *uap) {
+ bool freeze = *(bool *)uap;
+ bool frozen;
+ isc_result_t result = ISC_R_SUCCESS;
+ char classstr[DNS_RDATACLASS_FORMATSIZE];
+ char zonename[DNS_NAME_FORMATSIZE];
+ dns_zone_t *raw = NULL;
+ dns_view_t *view;
+ const char *vname;
+ const char *sep;
+ int level;
+
+ dns_zone_getraw(zone, &raw);
+ if (raw != NULL)
+ zone = raw;
+ if (dns_zone_gettype(zone) != dns_zone_master) {
+ if (raw != NULL)
+ dns_zone_detach(&raw);
+ return (ISC_R_SUCCESS);
+ }
+ if (!dns_zone_isdynamic(zone, true)) {
+ if (raw != NULL)
+ dns_zone_detach(&raw);
+ return (ISC_R_SUCCESS);
+ }
+
+ frozen = dns_zone_getupdatedisabled(zone);
+ if (freeze) {
+ if (frozen)
+ result = DNS_R_FROZEN;
+ if (result == ISC_R_SUCCESS)
+ result = dns_zone_flush(zone);
+ if (result == ISC_R_SUCCESS)
+ dns_zone_setupdatedisabled(zone, freeze);
+ } else {
+ if (frozen) {
+ result = dns_zone_loadandthaw(zone);
+ if (result == DNS_R_CONTINUE ||
+ result == DNS_R_UPTODATE)
+ result = ISC_R_SUCCESS;
+ }
+ }
+ view = dns_zone_getview(zone);
+ if (strcmp(view->name, "_bind") == 0 ||
+ strcmp(view->name, "_default") == 0)
+ {
+ vname = "";
+ sep = "";
+ } else {
+ vname = view->name;
+ sep = " ";
+ }
+ dns_rdataclass_format(dns_zone_getclass(zone), classstr,
+ sizeof(classstr));
+ dns_name_format(dns_zone_getorigin(zone), zonename, sizeof(zonename));
+ level = (result != ISC_R_SUCCESS) ? ISC_LOG_ERROR : ISC_LOG_DEBUG(1);
+ isc_log_write(dns_lctx, DNS_LOGCATEGORY_GENERAL, DNS_LOGMODULE_ZONE,
+ level, "%s zone '%s/%s'%s%s: %s",
+ freeze ? "freezing" : "thawing",
+ zonename, classstr, sep, vname,
+ isc_result_totext(result));
+ if (raw != NULL)
+ dns_zone_detach(&raw);
+ return (result);
+}
+
+void
+dns_zt_setviewcommit(dns_zt_t *zt) {
+ dns_rbtnode_t *node;
+ dns_rbtnodechain_t chain;
+ isc_result_t result;
+
+ REQUIRE(VALID_ZT(zt));
+
+ dns_rbtnodechain_init(&chain, zt->mctx);
+
+ result = dns_rbtnodechain_first(&chain, zt->table, NULL, NULL);
+ while (result == DNS_R_NEWORIGIN || result == ISC_R_SUCCESS) {
+ result = dns_rbtnodechain_current(&chain, NULL, NULL,
+ &node);
+ if (result == ISC_R_SUCCESS && node->data != NULL) {
+ dns_zone_setviewcommit(node->data);
+ }
+
+ result = dns_rbtnodechain_next(&chain, NULL, NULL);
+ }
+
+ dns_rbtnodechain_invalidate(&chain);
+}
+
+void
+dns_zt_setviewrevert(dns_zt_t *zt) {
+ dns_rbtnode_t *node;
+ dns_rbtnodechain_t chain;
+ isc_result_t result;
+
+ REQUIRE(VALID_ZT(zt));
+
+ dns_rbtnodechain_init(&chain, zt->mctx);
+
+ result = dns_rbtnodechain_first(&chain, zt->table, NULL, NULL);
+ while (result == DNS_R_NEWORIGIN || result == ISC_R_SUCCESS) {
+ result = dns_rbtnodechain_current(&chain, NULL, NULL,
+ &node);
+ if (result == ISC_R_SUCCESS && node->data != NULL) {
+ dns_zone_setviewrevert(node->data);
+ }
+
+ result = dns_rbtnodechain_next(&chain, NULL, NULL);
+ }
+
+ dns_rbtnodechain_invalidate(&chain);
+}
+
+isc_result_t
+dns_zt_apply(dns_zt_t *zt, bool stop,
+ isc_result_t (*action)(dns_zone_t *, void *), void *uap)
+{
+ return (dns_zt_apply2(zt, stop, NULL, action, uap));
+}
+
+isc_result_t
+dns_zt_apply2(dns_zt_t *zt, bool stop, isc_result_t *sub,
+ isc_result_t (*action)(dns_zone_t *, void *), void *uap)
+{
+ dns_rbtnode_t *node;
+ dns_rbtnodechain_t chain;
+ isc_result_t result, tresult = ISC_R_SUCCESS;
+ dns_zone_t *zone;
+
+ REQUIRE(VALID_ZT(zt));
+ REQUIRE(action != NULL);
+
+ dns_rbtnodechain_init(&chain, zt->mctx);
+ result = dns_rbtnodechain_first(&chain, zt->table, NULL, NULL);
+ if (result == ISC_R_NOTFOUND) {
+ /*
+ * The tree is empty.
+ */
+ tresult = result;
+ result = ISC_R_NOMORE;
+ }
+ while (result == DNS_R_NEWORIGIN || result == ISC_R_SUCCESS) {
+ result = dns_rbtnodechain_current(&chain, NULL, NULL,
+ &node);
+ if (result == ISC_R_SUCCESS) {
+ zone = node->data;
+ if (zone != NULL)
+ result = (action)(zone, uap);
+ if (result != ISC_R_SUCCESS && stop) {
+ tresult = result;
+ goto cleanup; /* don't break */
+ } else if (result != ISC_R_SUCCESS &&
+ tresult == ISC_R_SUCCESS)
+ tresult = result;
+ }
+ result = dns_rbtnodechain_next(&chain, NULL, NULL);
+ }
+ if (result == ISC_R_NOMORE)
+ result = ISC_R_SUCCESS;
+
+ cleanup:
+ dns_rbtnodechain_invalidate(&chain);
+ if (sub != NULL)
+ *sub = tresult;
+
+ return (result);
+}
+
+/*
+ * Decrement the loads_pending counter; when counter reaches
+ * zero, call the loaddone callback that was initially set by
+ * dns_zt_asyncload().
+ */
+static isc_result_t
+doneloading(dns_zt_t *zt, dns_zone_t *zone, isc_task_t *task) {
+ bool destroy = false;
+ dns_zt_allloaded_t alldone = NULL;
+ void *arg = NULL;
+
+ UNUSED(zone);
+ UNUSED(task);
+
+ REQUIRE(VALID_ZT(zt));
+
+ RWLOCK(&zt->rwlock, isc_rwlocktype_write);
+ INSIST(zt->loads_pending != 0);
+ INSIST(zt->references != 0);
+ zt->references--;
+ if (zt->references == 0)
+ destroy = true;
+ zt->loads_pending--;
+ if (zt->loads_pending == 0) {
+ alldone = zt->loaddone;
+ arg = zt->loaddone_arg;
+ zt->loaddone = NULL;
+ zt->loaddone_arg = NULL;
+ }
+ RWUNLOCK(&zt->rwlock, isc_rwlocktype_write);
+
+ if (alldone != NULL)
+ alldone(arg);
+
+ if (destroy)
+ zt_destroy(zt);
+
+ return (ISC_R_SUCCESS);
+}
+
+/***
+ *** Private
+ ***/
+
+static void
+auto_detach(void *data, void *arg) {
+ dns_zone_t *zone = data;
+
+ UNUSED(arg);
+ dns_zone_detach(&zone);
+}