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-rw-r--r--lib/dns/sdlz.c2108
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diff --git a/lib/dns/sdlz.c b/lib/dns/sdlz.c
new file mode 100644
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--- /dev/null
+++ b/lib/dns/sdlz.c
@@ -0,0 +1,2108 @@
+/*
+ * Copyright (C) Internet Systems Consortium, Inc. ("ISC")
+ *
+ * SPDX-License-Identifier: MPL-2.0 AND 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 https://mozilla.org/MPL/2.0/.
+ *
+ * See the COPYRIGHT file distributed with this work for additional
+ * information regarding copyright ownership.
+ */
+
+/*
+ * Copyright (C) 2002 Stichting NLnet, Netherlands, stichting@nlnet.nl.
+ *
+ * Permission to use, copy, modify, and 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 STICHTING NLNET
+ * DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL
+ * STICHTING NLNET 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.
+ *
+ * The development of Dynamically Loadable Zones (DLZ) for Bind 9 was
+ * conceived and contributed by Rob Butler.
+ *
+ * Permission to use, copy, modify, and 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 ROB BUTLER
+ * DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL
+ * ROB BUTLER 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 <inttypes.h>
+#include <stdbool.h>
+#include <string.h>
+
+#include <isc/buffer.h>
+#include <isc/lex.h>
+#include <isc/log.h>
+#include <isc/magic.h>
+#include <isc/mem.h>
+#include <isc/once.h>
+#include <isc/print.h>
+#include <isc/region.h>
+#include <isc/rwlock.h>
+#include <isc/string.h>
+#include <isc/util.h>
+
+#include <dns/callbacks.h>
+#include <dns/db.h>
+#include <dns/dbiterator.h>
+#include <dns/dlz.h>
+#include <dns/fixedname.h>
+#include <dns/log.h>
+#include <dns/master.h>
+#include <dns/rdata.h>
+#include <dns/rdatalist.h>
+#include <dns/rdataset.h>
+#include <dns/rdatasetiter.h>
+#include <dns/rdatatype.h>
+#include <dns/result.h>
+#include <dns/sdlz.h>
+#include <dns/types.h>
+
+#include "rdatalist_p.h"
+
+/*
+ * Private Types
+ */
+
+struct dns_sdlzimplementation {
+ const dns_sdlzmethods_t *methods;
+ isc_mem_t *mctx;
+ void *driverarg;
+ unsigned int flags;
+ isc_mutex_t driverlock;
+ dns_dlzimplementation_t *dlz_imp;
+};
+
+struct dns_sdlz_db {
+ /* Unlocked */
+ dns_db_t common;
+ void *dbdata;
+ dns_sdlzimplementation_t *dlzimp;
+
+ /* Atomic */
+ isc_refcount_t references;
+
+ /* Locked */
+ dns_dbversion_t *future_version;
+ int dummy_version;
+};
+
+struct dns_sdlzlookup {
+ /* Unlocked */
+ unsigned int magic;
+ dns_sdlz_db_t *sdlz;
+ ISC_LIST(dns_rdatalist_t) lists;
+ ISC_LIST(isc_buffer_t) buffers;
+ dns_name_t *name;
+ ISC_LINK(dns_sdlzlookup_t) link;
+ dns_rdatacallbacks_t callbacks;
+
+ /* Atomic */
+ isc_refcount_t references;
+};
+
+typedef struct dns_sdlzlookup dns_sdlznode_t;
+
+struct dns_sdlzallnodes {
+ dns_dbiterator_t common;
+ ISC_LIST(dns_sdlznode_t) nodelist;
+ dns_sdlznode_t *current;
+ dns_sdlznode_t *origin;
+};
+
+typedef dns_sdlzallnodes_t sdlz_dbiterator_t;
+
+typedef struct sdlz_rdatasetiter {
+ dns_rdatasetiter_t common;
+ dns_rdatalist_t *current;
+} sdlz_rdatasetiter_t;
+
+#define SDLZDB_MAGIC ISC_MAGIC('D', 'L', 'Z', 'S')
+
+/*
+ * Note that "impmagic" is not the first four bytes of the struct, so
+ * ISC_MAGIC_VALID cannot be used.
+ */
+
+#define VALID_SDLZDB(sdlzdb) \
+ ((sdlzdb) != NULL && (sdlzdb)->common.impmagic == SDLZDB_MAGIC)
+
+#define SDLZLOOKUP_MAGIC ISC_MAGIC('D', 'L', 'Z', 'L')
+#define VALID_SDLZLOOKUP(sdlzl) ISC_MAGIC_VALID(sdlzl, SDLZLOOKUP_MAGIC)
+#define VALID_SDLZNODE(sdlzn) VALID_SDLZLOOKUP(sdlzn)
+
+/* These values are taken from RFC 1537 */
+#define SDLZ_DEFAULT_REFRESH 28800U /* 8 hours */
+#define SDLZ_DEFAULT_RETRY 7200U /* 2 hours */
+#define SDLZ_DEFAULT_EXPIRE 604800U /* 7 days */
+#define SDLZ_DEFAULT_MINIMUM 86400U /* 1 day */
+
+/* This is a reasonable value */
+#define SDLZ_DEFAULT_TTL (60 * 60 * 24)
+
+#ifdef __COVERITY__
+#define MAYBE_LOCK(imp) LOCK(&imp->driverlock)
+#define MAYBE_UNLOCK(imp) UNLOCK(&imp->driverlock)
+#else /* ifdef __COVERITY__ */
+#define MAYBE_LOCK(imp) \
+ do { \
+ unsigned int flags = imp->flags; \
+ if ((flags & DNS_SDLZFLAG_THREADSAFE) == 0) \
+ LOCK(&imp->driverlock); \
+ } while (0)
+
+#define MAYBE_UNLOCK(imp) \
+ do { \
+ unsigned int flags = imp->flags; \
+ if ((flags & DNS_SDLZFLAG_THREADSAFE) == 0) \
+ UNLOCK(&imp->driverlock); \
+ } while (0)
+#endif /* ifdef __COVERITY__ */
+
+/*
+ * Forward references.
+ */
+static isc_result_t
+getnodedata(dns_db_t *db, const dns_name_t *name, bool create,
+ unsigned int options, dns_clientinfomethods_t *methods,
+ dns_clientinfo_t *clientinfo, dns_dbnode_t **nodep);
+
+static void
+list_tordataset(dns_rdatalist_t *rdatalist, dns_db_t *db, dns_dbnode_t *node,
+ dns_rdataset_t *rdataset);
+
+static void
+detachnode(dns_db_t *db, dns_dbnode_t **targetp);
+
+static void
+dbiterator_destroy(dns_dbiterator_t **iteratorp);
+static isc_result_t
+dbiterator_first(dns_dbiterator_t *iterator);
+static isc_result_t
+dbiterator_last(dns_dbiterator_t *iterator);
+static isc_result_t
+dbiterator_seek(dns_dbiterator_t *iterator, const dns_name_t *name);
+static isc_result_t
+dbiterator_prev(dns_dbiterator_t *iterator);
+static isc_result_t
+dbiterator_next(dns_dbiterator_t *iterator);
+static isc_result_t
+dbiterator_current(dns_dbiterator_t *iterator, dns_dbnode_t **nodep,
+ dns_name_t *name);
+static isc_result_t
+dbiterator_pause(dns_dbiterator_t *iterator);
+static isc_result_t
+dbiterator_origin(dns_dbiterator_t *iterator, dns_name_t *name);
+
+static dns_dbiteratormethods_t dbiterator_methods = {
+ dbiterator_destroy, dbiterator_first, dbiterator_last,
+ dbiterator_seek, dbiterator_prev, dbiterator_next,
+ dbiterator_current, dbiterator_pause, dbiterator_origin
+};
+
+/*
+ * Utility functions
+ */
+
+/*
+ * Log a message at the given level
+ */
+static void
+sdlz_log(int level, const char *fmt, ...) {
+ va_list ap;
+ va_start(ap, fmt);
+ isc_log_vwrite(dns_lctx, DNS_LOGCATEGORY_DATABASE, DNS_LOGMODULE_DLZ,
+ ISC_LOG_DEBUG(level), fmt, ap);
+ va_end(ap);
+}
+
+/*% Converts the input string to lowercase, in place. */
+static void
+dns_sdlz_tolower(char *str) {
+ unsigned int len = strlen(str);
+ unsigned int i;
+
+ for (i = 0; i < len; i++) {
+ if (str[i] >= 'A' && str[i] <= 'Z') {
+ str[i] += 32;
+ }
+ }
+}
+
+static unsigned int
+initial_size(const char *data) {
+ unsigned int len = (strlen(data) / 64) + 1;
+ return (len * 64 + 64);
+}
+
+/*
+ * Rdataset Iterator Methods. These methods were "borrowed" from the SDB
+ * driver interface. See the SDB driver interface documentation for more info.
+ */
+
+static void
+rdatasetiter_destroy(dns_rdatasetiter_t **iteratorp) {
+ sdlz_rdatasetiter_t *sdlziterator = (sdlz_rdatasetiter_t *)(*iteratorp);
+
+ detachnode(sdlziterator->common.db, &sdlziterator->common.node);
+ isc_mem_put(sdlziterator->common.db->mctx, sdlziterator,
+ sizeof(sdlz_rdatasetiter_t));
+ *iteratorp = NULL;
+}
+
+static isc_result_t
+rdatasetiter_first(dns_rdatasetiter_t *iterator) {
+ sdlz_rdatasetiter_t *sdlziterator = (sdlz_rdatasetiter_t *)iterator;
+ dns_sdlznode_t *sdlznode = (dns_sdlznode_t *)iterator->node;
+
+ if (ISC_LIST_EMPTY(sdlznode->lists)) {
+ return (ISC_R_NOMORE);
+ }
+ sdlziterator->current = ISC_LIST_HEAD(sdlznode->lists);
+ return (ISC_R_SUCCESS);
+}
+
+static isc_result_t
+rdatasetiter_next(dns_rdatasetiter_t *iterator) {
+ sdlz_rdatasetiter_t *sdlziterator = (sdlz_rdatasetiter_t *)iterator;
+
+ sdlziterator->current = ISC_LIST_NEXT(sdlziterator->current, link);
+ if (sdlziterator->current == NULL) {
+ return (ISC_R_NOMORE);
+ } else {
+ return (ISC_R_SUCCESS);
+ }
+}
+
+static void
+rdatasetiter_current(dns_rdatasetiter_t *iterator, dns_rdataset_t *rdataset) {
+ sdlz_rdatasetiter_t *sdlziterator = (sdlz_rdatasetiter_t *)iterator;
+
+ list_tordataset(sdlziterator->current, iterator->db, iterator->node,
+ rdataset);
+}
+
+static dns_rdatasetitermethods_t rdatasetiter_methods = {
+ rdatasetiter_destroy, rdatasetiter_first, rdatasetiter_next,
+ rdatasetiter_current
+};
+
+/*
+ * DB routines. These methods were "borrowed" from the SDB driver interface.
+ * See the SDB driver interface documentation for more info.
+ */
+
+static void
+attach(dns_db_t *source, dns_db_t **targetp) {
+ dns_sdlz_db_t *sdlz = (dns_sdlz_db_t *)source;
+
+ REQUIRE(VALID_SDLZDB(sdlz));
+
+ isc_refcount_increment(&sdlz->references);
+
+ *targetp = source;
+}
+
+static void
+destroy(dns_sdlz_db_t *sdlz) {
+ sdlz->common.magic = 0;
+ sdlz->common.impmagic = 0;
+
+ dns_name_free(&sdlz->common.origin, sdlz->common.mctx);
+
+ isc_refcount_destroy(&sdlz->references);
+ isc_mem_putanddetach(&sdlz->common.mctx, sdlz, sizeof(dns_sdlz_db_t));
+}
+
+static void
+detach(dns_db_t **dbp) {
+ dns_sdlz_db_t *sdlz = (dns_sdlz_db_t *)(*dbp);
+
+ REQUIRE(VALID_SDLZDB(sdlz));
+
+ *dbp = NULL;
+
+ if (isc_refcount_decrement(&sdlz->references) == 1) {
+ destroy(sdlz);
+ }
+}
+
+static isc_result_t
+beginload(dns_db_t *db, dns_rdatacallbacks_t *callbacks) {
+ UNUSED(db);
+ UNUSED(callbacks);
+ return (ISC_R_NOTIMPLEMENTED);
+}
+
+static isc_result_t
+endload(dns_db_t *db, dns_rdatacallbacks_t *callbacks) {
+ UNUSED(db);
+ UNUSED(callbacks);
+ return (ISC_R_NOTIMPLEMENTED);
+}
+
+static isc_result_t
+dump(dns_db_t *db, dns_dbversion_t *version, const char *filename,
+ dns_masterformat_t masterformat) {
+ UNUSED(db);
+ UNUSED(version);
+ UNUSED(filename);
+ UNUSED(masterformat);
+ return (ISC_R_NOTIMPLEMENTED);
+}
+
+static void
+currentversion(dns_db_t *db, dns_dbversion_t **versionp) {
+ dns_sdlz_db_t *sdlz = (dns_sdlz_db_t *)db;
+ REQUIRE(VALID_SDLZDB(sdlz));
+ REQUIRE(versionp != NULL && *versionp == NULL);
+
+ *versionp = (void *)&sdlz->dummy_version;
+ return;
+}
+
+static isc_result_t
+newversion(dns_db_t *db, dns_dbversion_t **versionp) {
+ dns_sdlz_db_t *sdlz = (dns_sdlz_db_t *)db;
+ char origin[DNS_NAME_MAXTEXT + 1];
+ isc_result_t result;
+
+ REQUIRE(VALID_SDLZDB(sdlz));
+
+ if (sdlz->dlzimp->methods->newversion == NULL) {
+ return (ISC_R_NOTIMPLEMENTED);
+ }
+
+ dns_name_format(&sdlz->common.origin, origin, sizeof(origin));
+
+ result = sdlz->dlzimp->methods->newversion(
+ origin, sdlz->dlzimp->driverarg, sdlz->dbdata, versionp);
+ if (result != ISC_R_SUCCESS) {
+ sdlz_log(ISC_LOG_ERROR,
+ "sdlz newversion on origin %s failed : %s", origin,
+ isc_result_totext(result));
+ return (result);
+ }
+
+ sdlz->future_version = *versionp;
+ return (ISC_R_SUCCESS);
+}
+
+static void
+attachversion(dns_db_t *db, dns_dbversion_t *source,
+ dns_dbversion_t **targetp) {
+ dns_sdlz_db_t *sdlz = (dns_sdlz_db_t *)db;
+
+ REQUIRE(VALID_SDLZDB(sdlz));
+ REQUIRE(source != NULL && source == (void *)&sdlz->dummy_version);
+
+ *targetp = source;
+}
+
+static void
+closeversion(dns_db_t *db, dns_dbversion_t **versionp, bool commit) {
+ dns_sdlz_db_t *sdlz = (dns_sdlz_db_t *)db;
+ char origin[DNS_NAME_MAXTEXT + 1];
+
+ REQUIRE(VALID_SDLZDB(sdlz));
+ REQUIRE(versionp != NULL);
+
+ if (*versionp == (void *)&sdlz->dummy_version) {
+ *versionp = NULL;
+ return;
+ }
+
+ REQUIRE(*versionp == sdlz->future_version);
+ REQUIRE(sdlz->dlzimp->methods->closeversion != NULL);
+
+ dns_name_format(&sdlz->common.origin, origin, sizeof(origin));
+
+ sdlz->dlzimp->methods->closeversion(origin, commit,
+ sdlz->dlzimp->driverarg,
+ sdlz->dbdata, versionp);
+ if (*versionp != NULL) {
+ sdlz_log(ISC_LOG_ERROR, "sdlz closeversion on origin %s failed",
+ origin);
+ }
+
+ sdlz->future_version = NULL;
+}
+
+static isc_result_t
+createnode(dns_sdlz_db_t *sdlz, dns_sdlznode_t **nodep) {
+ dns_sdlznode_t *node;
+
+ node = isc_mem_get(sdlz->common.mctx, sizeof(dns_sdlznode_t));
+
+ node->sdlz = NULL;
+ attach((dns_db_t *)sdlz, (dns_db_t **)&node->sdlz);
+ ISC_LIST_INIT(node->lists);
+ ISC_LIST_INIT(node->buffers);
+ ISC_LINK_INIT(node, link);
+ node->name = NULL;
+ dns_rdatacallbacks_init(&node->callbacks);
+
+ isc_refcount_init(&node->references, 1);
+ node->magic = SDLZLOOKUP_MAGIC;
+
+ *nodep = node;
+ return (ISC_R_SUCCESS);
+}
+
+static void
+destroynode(dns_sdlznode_t *node) {
+ dns_rdatalist_t *list;
+ dns_rdata_t *rdata;
+ isc_buffer_t *b;
+ dns_sdlz_db_t *sdlz;
+ dns_db_t *db;
+ isc_mem_t *mctx;
+
+ isc_refcount_destroy(&node->references);
+
+ sdlz = node->sdlz;
+ mctx = sdlz->common.mctx;
+
+ while (!ISC_LIST_EMPTY(node->lists)) {
+ list = ISC_LIST_HEAD(node->lists);
+ while (!ISC_LIST_EMPTY(list->rdata)) {
+ rdata = ISC_LIST_HEAD(list->rdata);
+ ISC_LIST_UNLINK(list->rdata, rdata, link);
+ isc_mem_put(mctx, rdata, sizeof(dns_rdata_t));
+ }
+ ISC_LIST_UNLINK(node->lists, list, link);
+ isc_mem_put(mctx, list, sizeof(dns_rdatalist_t));
+ }
+
+ while (!ISC_LIST_EMPTY(node->buffers)) {
+ b = ISC_LIST_HEAD(node->buffers);
+ ISC_LIST_UNLINK(node->buffers, b, link);
+ isc_buffer_free(&b);
+ }
+
+ if (node->name != NULL) {
+ dns_name_free(node->name, mctx);
+ isc_mem_put(mctx, node->name, sizeof(dns_name_t));
+ }
+
+ node->magic = 0;
+ isc_mem_put(mctx, node, sizeof(dns_sdlznode_t));
+ db = &sdlz->common;
+ detach(&db);
+}
+
+static isc_result_t
+getnodedata(dns_db_t *db, const dns_name_t *name, bool create,
+ unsigned int options, dns_clientinfomethods_t *methods,
+ dns_clientinfo_t *clientinfo, dns_dbnode_t **nodep) {
+ dns_sdlz_db_t *sdlz = (dns_sdlz_db_t *)db;
+ dns_sdlznode_t *node = NULL;
+ isc_result_t result;
+ isc_buffer_t b;
+ char namestr[DNS_NAME_MAXTEXT + 1];
+ isc_buffer_t b2;
+ char zonestr[DNS_NAME_MAXTEXT + 1];
+ bool isorigin;
+ dns_sdlzauthorityfunc_t authority;
+
+ REQUIRE(VALID_SDLZDB(sdlz));
+ REQUIRE(nodep != NULL && *nodep == NULL);
+
+ if (sdlz->dlzimp->methods->newversion == NULL) {
+ REQUIRE(!create);
+ }
+
+ isc_buffer_init(&b, namestr, sizeof(namestr));
+ if ((sdlz->dlzimp->flags & DNS_SDLZFLAG_RELATIVEOWNER) != 0) {
+ dns_name_t relname;
+ unsigned int labels;
+
+ labels = dns_name_countlabels(name) -
+ dns_name_countlabels(&sdlz->common.origin);
+ dns_name_init(&relname, NULL);
+ dns_name_getlabelsequence(name, 0, labels, &relname);
+ result = dns_name_totext(&relname, true, &b);
+ if (result != ISC_R_SUCCESS) {
+ return (result);
+ }
+ } else {
+ result = dns_name_totext(name, true, &b);
+ if (result != ISC_R_SUCCESS) {
+ return (result);
+ }
+ }
+ isc_buffer_putuint8(&b, 0);
+
+ isc_buffer_init(&b2, zonestr, sizeof(zonestr));
+ result = dns_name_totext(&sdlz->common.origin, true, &b2);
+ if (result != ISC_R_SUCCESS) {
+ return (result);
+ }
+ isc_buffer_putuint8(&b2, 0);
+
+ result = createnode(sdlz, &node);
+ if (result != ISC_R_SUCCESS) {
+ return (result);
+ }
+
+ isorigin = dns_name_equal(name, &sdlz->common.origin);
+
+ /* make sure strings are always lowercase */
+ dns_sdlz_tolower(zonestr);
+ dns_sdlz_tolower(namestr);
+
+ MAYBE_LOCK(sdlz->dlzimp);
+
+ /* try to lookup the host (namestr) */
+ result = sdlz->dlzimp->methods->lookup(
+ zonestr, namestr, sdlz->dlzimp->driverarg, sdlz->dbdata, node,
+ methods, clientinfo);
+
+ /*
+ * If the name was not found and DNS_DBFIND_NOWILD is not
+ * set, then we try to find a wildcard entry.
+ *
+ * If DNS_DBFIND_NOZONECUT is set and there are multiple
+ * levels between the host and the zone origin, we also look
+ * for wildcards at each level.
+ */
+ if (result == ISC_R_NOTFOUND && !create &&
+ (options & DNS_DBFIND_NOWILD) == 0)
+ {
+ unsigned int i, dlabels, nlabels;
+
+ nlabels = dns_name_countlabels(name);
+ dlabels = nlabels - dns_name_countlabels(&sdlz->common.origin);
+ for (i = 0; i < dlabels; i++) {
+ char wildstr[DNS_NAME_MAXTEXT + 1];
+ dns_fixedname_t fixed;
+ const dns_name_t *wild;
+
+ dns_fixedname_init(&fixed);
+ if (i == dlabels - 1) {
+ wild = dns_wildcardname;
+ } else {
+ dns_name_t *fname;
+ fname = dns_fixedname_name(&fixed);
+ dns_name_getlabelsequence(
+ name, i + 1, dlabels - i - 1, fname);
+ result = dns_name_concatenate(
+ dns_wildcardname, fname, fname, NULL);
+ if (result != ISC_R_SUCCESS) {
+ MAYBE_UNLOCK(sdlz->dlzimp);
+ return (result);
+ }
+ wild = fname;
+ }
+
+ isc_buffer_init(&b, wildstr, sizeof(wildstr));
+ result = dns_name_totext(wild, true, &b);
+ if (result != ISC_R_SUCCESS) {
+ MAYBE_UNLOCK(sdlz->dlzimp);
+ return (result);
+ }
+ isc_buffer_putuint8(&b, 0);
+
+ result = sdlz->dlzimp->methods->lookup(
+ zonestr, wildstr, sdlz->dlzimp->driverarg,
+ sdlz->dbdata, node, methods, clientinfo);
+ if (result == ISC_R_SUCCESS) {
+ break;
+ }
+ }
+ }
+
+ MAYBE_UNLOCK(sdlz->dlzimp);
+
+ if (result == ISC_R_NOTFOUND && (isorigin || create)) {
+ result = ISC_R_SUCCESS;
+ }
+
+ if (result != ISC_R_SUCCESS) {
+ isc_refcount_decrementz(&node->references);
+ destroynode(node);
+ return (result);
+ }
+
+ if (isorigin && sdlz->dlzimp->methods->authority != NULL) {
+ MAYBE_LOCK(sdlz->dlzimp);
+ authority = sdlz->dlzimp->methods->authority;
+ result = (*authority)(zonestr, sdlz->dlzimp->driverarg,
+ sdlz->dbdata, node);
+ MAYBE_UNLOCK(sdlz->dlzimp);
+ if (result != ISC_R_SUCCESS && result != ISC_R_NOTIMPLEMENTED) {
+ isc_refcount_decrementz(&node->references);
+ destroynode(node);
+ return (result);
+ }
+ }
+
+ if (node->name == NULL) {
+ node->name = isc_mem_get(sdlz->common.mctx, sizeof(dns_name_t));
+ dns_name_init(node->name, NULL);
+ dns_name_dup(name, sdlz->common.mctx, node->name);
+ }
+
+ *nodep = node;
+ return (ISC_R_SUCCESS);
+}
+
+static isc_result_t
+findnodeext(dns_db_t *db, const dns_name_t *name, bool create,
+ dns_clientinfomethods_t *methods, dns_clientinfo_t *clientinfo,
+ dns_dbnode_t **nodep) {
+ return (getnodedata(db, name, create, 0, methods, clientinfo, nodep));
+}
+
+static isc_result_t
+findnode(dns_db_t *db, const dns_name_t *name, bool create,
+ dns_dbnode_t **nodep) {
+ return (getnodedata(db, name, create, 0, NULL, NULL, nodep));
+}
+
+static isc_result_t
+findzonecut(dns_db_t *db, const dns_name_t *name, unsigned int options,
+ isc_stdtime_t now, dns_dbnode_t **nodep, dns_name_t *foundname,
+ dns_name_t *dcname, dns_rdataset_t *rdataset,
+ dns_rdataset_t *sigrdataset) {
+ UNUSED(db);
+ UNUSED(name);
+ UNUSED(options);
+ UNUSED(now);
+ UNUSED(nodep);
+ UNUSED(foundname);
+ UNUSED(dcname);
+ UNUSED(rdataset);
+ UNUSED(sigrdataset);
+
+ return (ISC_R_NOTIMPLEMENTED);
+}
+
+static void
+attachnode(dns_db_t *db, dns_dbnode_t *source, dns_dbnode_t **targetp) {
+ dns_sdlz_db_t *sdlz = (dns_sdlz_db_t *)db;
+ dns_sdlznode_t *node = (dns_sdlznode_t *)source;
+
+ REQUIRE(VALID_SDLZDB(sdlz));
+
+ UNUSED(sdlz);
+
+ isc_refcount_increment(&node->references);
+
+ *targetp = source;
+}
+
+static void
+detachnode(dns_db_t *db, dns_dbnode_t **targetp) {
+ dns_sdlz_db_t *sdlz = (dns_sdlz_db_t *)db;
+ dns_sdlznode_t *node;
+
+ REQUIRE(VALID_SDLZDB(sdlz));
+ REQUIRE(targetp != NULL && *targetp != NULL);
+
+ UNUSED(sdlz);
+
+ node = (dns_sdlznode_t *)(*targetp);
+ *targetp = NULL;
+
+ if (isc_refcount_decrement(&node->references) == 1) {
+ destroynode(node);
+ }
+}
+
+static isc_result_t
+expirenode(dns_db_t *db, dns_dbnode_t *node, isc_stdtime_t now) {
+ UNUSED(db);
+ UNUSED(node);
+ UNUSED(now);
+ UNREACHABLE();
+}
+
+static void
+printnode(dns_db_t *db, dns_dbnode_t *node, FILE *out) {
+ UNUSED(db);
+ UNUSED(node);
+ UNUSED(out);
+ return;
+}
+
+static isc_result_t
+createiterator(dns_db_t *db, unsigned int options,
+ dns_dbiterator_t **iteratorp) {
+ dns_sdlz_db_t *sdlz = (dns_sdlz_db_t *)db;
+ sdlz_dbiterator_t *sdlziter;
+ isc_result_t result;
+ isc_buffer_t b;
+ char zonestr[DNS_NAME_MAXTEXT + 1];
+
+ REQUIRE(VALID_SDLZDB(sdlz));
+
+ if (sdlz->dlzimp->methods->allnodes == NULL) {
+ return (ISC_R_NOTIMPLEMENTED);
+ }
+
+ if ((options & DNS_DB_NSEC3ONLY) != 0 ||
+ (options & DNS_DB_NONSEC3) != 0)
+ {
+ return (ISC_R_NOTIMPLEMENTED);
+ }
+
+ isc_buffer_init(&b, zonestr, sizeof(zonestr));
+ result = dns_name_totext(&sdlz->common.origin, true, &b);
+ if (result != ISC_R_SUCCESS) {
+ return (result);
+ }
+ isc_buffer_putuint8(&b, 0);
+
+ sdlziter = isc_mem_get(sdlz->common.mctx, sizeof(sdlz_dbiterator_t));
+
+ sdlziter->common.methods = &dbiterator_methods;
+ sdlziter->common.db = NULL;
+ dns_db_attach(db, &sdlziter->common.db);
+ sdlziter->common.relative_names = ((options & DNS_DB_RELATIVENAMES) !=
+ 0);
+ sdlziter->common.magic = DNS_DBITERATOR_MAGIC;
+ ISC_LIST_INIT(sdlziter->nodelist);
+ sdlziter->current = NULL;
+ sdlziter->origin = NULL;
+
+ /* make sure strings are always lowercase */
+ dns_sdlz_tolower(zonestr);
+
+ MAYBE_LOCK(sdlz->dlzimp);
+ result = sdlz->dlzimp->methods->allnodes(
+ zonestr, sdlz->dlzimp->driverarg, sdlz->dbdata, sdlziter);
+ MAYBE_UNLOCK(sdlz->dlzimp);
+ if (result != ISC_R_SUCCESS) {
+ dns_dbiterator_t *iter = &sdlziter->common;
+ dbiterator_destroy(&iter);
+ return (result);
+ }
+
+ if (sdlziter->origin != NULL) {
+ ISC_LIST_UNLINK(sdlziter->nodelist, sdlziter->origin, link);
+ ISC_LIST_PREPEND(sdlziter->nodelist, sdlziter->origin, link);
+ }
+
+ *iteratorp = (dns_dbiterator_t *)sdlziter;
+
+ return (ISC_R_SUCCESS);
+}
+
+static isc_result_t
+findrdataset(dns_db_t *db, dns_dbnode_t *node, dns_dbversion_t *version,
+ dns_rdatatype_t type, dns_rdatatype_t covers, isc_stdtime_t now,
+ dns_rdataset_t *rdataset, dns_rdataset_t *sigrdataset) {
+ REQUIRE(VALID_SDLZNODE(node));
+ dns_rdatalist_t *list;
+ dns_sdlznode_t *sdlznode = (dns_sdlznode_t *)node;
+
+ UNUSED(db);
+ UNUSED(version);
+ UNUSED(covers);
+ UNUSED(now);
+ UNUSED(sigrdataset);
+
+ if (type == dns_rdatatype_sig || type == dns_rdatatype_rrsig) {
+ return (ISC_R_NOTIMPLEMENTED);
+ }
+
+ list = ISC_LIST_HEAD(sdlznode->lists);
+ while (list != NULL) {
+ if (list->type == type) {
+ break;
+ }
+ list = ISC_LIST_NEXT(list, link);
+ }
+ if (list == NULL) {
+ return (ISC_R_NOTFOUND);
+ }
+
+ list_tordataset(list, db, node, rdataset);
+
+ return (ISC_R_SUCCESS);
+}
+
+static isc_result_t
+findext(dns_db_t *db, const dns_name_t *name, dns_dbversion_t *version,
+ dns_rdatatype_t type, unsigned int options, isc_stdtime_t now,
+ dns_dbnode_t **nodep, dns_name_t *foundname,
+ dns_clientinfomethods_t *methods, dns_clientinfo_t *clientinfo,
+ dns_rdataset_t *rdataset, dns_rdataset_t *sigrdataset) {
+ dns_sdlz_db_t *sdlz = (dns_sdlz_db_t *)db;
+ dns_dbnode_t *node = NULL;
+ dns_fixedname_t fname;
+ dns_rdataset_t xrdataset;
+ dns_name_t *xname;
+ unsigned int nlabels, olabels;
+ isc_result_t result;
+ unsigned int i;
+
+ REQUIRE(VALID_SDLZDB(sdlz));
+ REQUIRE(nodep == NULL || *nodep == NULL);
+ REQUIRE(version == NULL || version == (void *)&sdlz->dummy_version ||
+ version == sdlz->future_version);
+
+ UNUSED(sdlz);
+
+ if (!dns_name_issubdomain(name, &db->origin)) {
+ return (DNS_R_NXDOMAIN);
+ }
+
+ olabels = dns_name_countlabels(&db->origin);
+ nlabels = dns_name_countlabels(name);
+
+ xname = dns_fixedname_initname(&fname);
+
+ if (rdataset == NULL) {
+ dns_rdataset_init(&xrdataset);
+ rdataset = &xrdataset;
+ }
+
+ result = DNS_R_NXDOMAIN;
+
+ /*
+ * If we're not walking down searching for zone
+ * cuts, we can cut straight to the chase
+ */
+ if ((options & DNS_DBFIND_NOZONECUT) != 0) {
+ i = nlabels;
+ goto search;
+ }
+
+ for (i = olabels; i <= nlabels; i++) {
+ search:
+ /*
+ * Look up the next label.
+ */
+ dns_name_getlabelsequence(name, nlabels - i, i, xname);
+ result = getnodedata(db, xname, false, options, methods,
+ clientinfo, &node);
+ if (result == ISC_R_NOTFOUND) {
+ result = DNS_R_NXDOMAIN;
+ continue;
+ } else if (result != ISC_R_SUCCESS) {
+ break;
+ }
+
+ /*
+ * Look for a DNAME at the current label, unless this is
+ * the qname.
+ */
+ if (i < nlabels) {
+ result = findrdataset(db, node, version,
+ dns_rdatatype_dname, 0, now,
+ rdataset, sigrdataset);
+ if (result == ISC_R_SUCCESS) {
+ result = DNS_R_DNAME;
+ break;
+ }
+ }
+
+ /*
+ * Look for an NS at the current label, unless this is the
+ * origin, glue is ok, or there are known to be no zone cuts.
+ */
+ if (i != olabels && (options & DNS_DBFIND_GLUEOK) == 0 &&
+ (options & DNS_DBFIND_NOZONECUT) == 0)
+ {
+ result = findrdataset(db, node, version,
+ dns_rdatatype_ns, 0, now,
+ rdataset, sigrdataset);
+
+ if (result == ISC_R_SUCCESS && i == nlabels &&
+ type == dns_rdatatype_any)
+ {
+ result = DNS_R_ZONECUT;
+ dns_rdataset_disassociate(rdataset);
+ if (sigrdataset != NULL &&
+ dns_rdataset_isassociated(sigrdataset))
+ {
+ dns_rdataset_disassociate(sigrdataset);
+ }
+ break;
+ } else if (result == ISC_R_SUCCESS) {
+ result = DNS_R_DELEGATION;
+ break;
+ }
+ }
+
+ /*
+ * If the current name is not the qname, add another label
+ * and try again.
+ */
+ if (i < nlabels) {
+ detachnode(db, &node);
+ node = NULL;
+ continue;
+ }
+
+ /*
+ * If we're looking for ANY, we're done.
+ */
+ if (type == dns_rdatatype_any) {
+ result = ISC_R_SUCCESS;
+ break;
+ }
+
+ /*
+ * Look for the qtype.
+ */
+ result = findrdataset(db, node, version, type, 0, now, rdataset,
+ sigrdataset);
+ if (result == ISC_R_SUCCESS) {
+ break;
+ }
+
+ /*
+ * Look for a CNAME
+ */
+ if (type != dns_rdatatype_cname) {
+ result = findrdataset(db, node, version,
+ dns_rdatatype_cname, 0, now,
+ rdataset, sigrdataset);
+ if (result == ISC_R_SUCCESS) {
+ result = DNS_R_CNAME;
+ break;
+ }
+ }
+
+ result = DNS_R_NXRRSET;
+ break;
+ }
+
+ if (rdataset == &xrdataset && dns_rdataset_isassociated(rdataset)) {
+ dns_rdataset_disassociate(rdataset);
+ }
+
+ if (foundname != NULL) {
+ dns_name_copynf(xname, foundname);
+ }
+
+ if (nodep != NULL) {
+ *nodep = node;
+ } else if (node != NULL) {
+ detachnode(db, &node);
+ }
+
+ return (result);
+}
+
+static isc_result_t
+find(dns_db_t *db, const dns_name_t *name, dns_dbversion_t *version,
+ dns_rdatatype_t type, unsigned int options, isc_stdtime_t now,
+ dns_dbnode_t **nodep, dns_name_t *foundname, dns_rdataset_t *rdataset,
+ dns_rdataset_t *sigrdataset) {
+ return (findext(db, name, version, type, options, now, nodep, foundname,
+ NULL, NULL, rdataset, sigrdataset));
+}
+
+static isc_result_t
+allrdatasets(dns_db_t *db, dns_dbnode_t *node, dns_dbversion_t *version,
+ unsigned int options, isc_stdtime_t now,
+ dns_rdatasetiter_t **iteratorp) {
+ dns_sdlz_db_t *sdlz = (dns_sdlz_db_t *)db;
+ sdlz_rdatasetiter_t *iterator;
+
+ REQUIRE(VALID_SDLZDB(sdlz));
+
+ REQUIRE(version == NULL || version == (void *)&sdlz->dummy_version ||
+ version == sdlz->future_version);
+
+ UNUSED(version);
+ UNUSED(now);
+
+ iterator = isc_mem_get(db->mctx, sizeof(sdlz_rdatasetiter_t));
+
+ iterator->common.magic = DNS_RDATASETITER_MAGIC;
+ iterator->common.methods = &rdatasetiter_methods;
+ iterator->common.db = db;
+ iterator->common.node = NULL;
+ attachnode(db, node, &iterator->common.node);
+ iterator->common.version = version;
+ iterator->common.options = options;
+ iterator->common.now = now;
+
+ *iteratorp = (dns_rdatasetiter_t *)iterator;
+
+ return (ISC_R_SUCCESS);
+}
+
+static isc_result_t
+modrdataset(dns_db_t *db, dns_dbnode_t *node, dns_dbversion_t *version,
+ dns_rdataset_t *rdataset, unsigned int options,
+ dns_sdlzmodrdataset_t mod_function) {
+ dns_sdlz_db_t *sdlz = (dns_sdlz_db_t *)db;
+ dns_master_style_t *style = NULL;
+ isc_result_t result;
+ isc_buffer_t *buffer = NULL;
+ isc_mem_t *mctx;
+ dns_sdlznode_t *sdlznode;
+ char *rdatastr = NULL;
+ char name[DNS_NAME_MAXTEXT + 1];
+
+ REQUIRE(VALID_SDLZDB(sdlz));
+
+ if (mod_function == NULL) {
+ return (ISC_R_NOTIMPLEMENTED);
+ }
+
+ sdlznode = (dns_sdlznode_t *)node;
+
+ UNUSED(options);
+
+ dns_name_format(sdlznode->name, name, sizeof(name));
+
+ mctx = sdlz->common.mctx;
+
+ isc_buffer_allocate(mctx, &buffer, 1024);
+
+ result = dns_master_stylecreate(&style, 0, 0, 0, 0, 0, 0, 1, 0xffffffff,
+ mctx);
+ if (result != ISC_R_SUCCESS) {
+ goto cleanup;
+ }
+
+ result = dns_master_rdatasettotext(sdlznode->name, rdataset, style,
+ NULL, buffer);
+ if (result != ISC_R_SUCCESS) {
+ goto cleanup;
+ }
+
+ if (isc_buffer_usedlength(buffer) < 1) {
+ result = ISC_R_BADADDRESSFORM;
+ goto cleanup;
+ }
+
+ rdatastr = isc_buffer_base(buffer);
+ if (rdatastr == NULL) {
+ result = ISC_R_NOMEMORY;
+ goto cleanup;
+ }
+ rdatastr[isc_buffer_usedlength(buffer) - 1] = 0;
+
+ MAYBE_LOCK(sdlz->dlzimp);
+ result = mod_function(name, rdatastr, sdlz->dlzimp->driverarg,
+ sdlz->dbdata, version);
+ MAYBE_UNLOCK(sdlz->dlzimp);
+
+cleanup:
+ isc_buffer_free(&buffer);
+ if (style != NULL) {
+ dns_master_styledestroy(&style, mctx);
+ }
+
+ return (result);
+}
+
+static isc_result_t
+addrdataset(dns_db_t *db, dns_dbnode_t *node, dns_dbversion_t *version,
+ isc_stdtime_t now, dns_rdataset_t *rdataset, unsigned int options,
+ dns_rdataset_t *addedrdataset) {
+ dns_sdlz_db_t *sdlz = (dns_sdlz_db_t *)db;
+ isc_result_t result;
+
+ UNUSED(now);
+ UNUSED(addedrdataset);
+ REQUIRE(VALID_SDLZDB(sdlz));
+
+ if (sdlz->dlzimp->methods->addrdataset == NULL) {
+ return (ISC_R_NOTIMPLEMENTED);
+ }
+
+ result = modrdataset(db, node, version, rdataset, options,
+ sdlz->dlzimp->methods->addrdataset);
+ return (result);
+}
+
+static isc_result_t
+subtractrdataset(dns_db_t *db, dns_dbnode_t *node, dns_dbversion_t *version,
+ dns_rdataset_t *rdataset, unsigned int options,
+ dns_rdataset_t *newrdataset) {
+ dns_sdlz_db_t *sdlz = (dns_sdlz_db_t *)db;
+ isc_result_t result;
+
+ UNUSED(newrdataset);
+ REQUIRE(VALID_SDLZDB(sdlz));
+
+ if (sdlz->dlzimp->methods->subtractrdataset == NULL) {
+ return (ISC_R_NOTIMPLEMENTED);
+ }
+
+ result = modrdataset(db, node, version, rdataset, options,
+ sdlz->dlzimp->methods->subtractrdataset);
+ return (result);
+}
+
+static isc_result_t
+deleterdataset(dns_db_t *db, dns_dbnode_t *node, dns_dbversion_t *version,
+ dns_rdatatype_t type, dns_rdatatype_t covers) {
+ dns_sdlz_db_t *sdlz = (dns_sdlz_db_t *)db;
+ char name[DNS_NAME_MAXTEXT + 1];
+ char b_type[DNS_RDATATYPE_FORMATSIZE];
+ dns_sdlznode_t *sdlznode;
+ isc_result_t result;
+
+ UNUSED(covers);
+
+ REQUIRE(VALID_SDLZDB(sdlz));
+
+ if (sdlz->dlzimp->methods->delrdataset == NULL) {
+ return (ISC_R_NOTIMPLEMENTED);
+ }
+
+ sdlznode = (dns_sdlznode_t *)node;
+ dns_name_format(sdlznode->name, name, sizeof(name));
+ dns_rdatatype_format(type, b_type, sizeof(b_type));
+
+ MAYBE_LOCK(sdlz->dlzimp);
+ result = sdlz->dlzimp->methods->delrdataset(
+ name, b_type, sdlz->dlzimp->driverarg, sdlz->dbdata, version);
+ MAYBE_UNLOCK(sdlz->dlzimp);
+
+ return (result);
+}
+
+static bool
+issecure(dns_db_t *db) {
+ UNUSED(db);
+
+ return (false);
+}
+
+static unsigned int
+nodecount(dns_db_t *db) {
+ UNUSED(db);
+
+ return (0);
+}
+
+static bool
+ispersistent(dns_db_t *db) {
+ UNUSED(db);
+ return (true);
+}
+
+static void
+overmem(dns_db_t *db, bool over) {
+ UNUSED(db);
+ UNUSED(over);
+}
+
+static void
+settask(dns_db_t *db, isc_task_t *task) {
+ UNUSED(db);
+ UNUSED(task);
+}
+
+/*
+ * getoriginnode() is used by the update code to find the
+ * dns_rdatatype_dnskey record for a zone
+ */
+static isc_result_t
+getoriginnode(dns_db_t *db, dns_dbnode_t **nodep) {
+ dns_sdlz_db_t *sdlz = (dns_sdlz_db_t *)db;
+ isc_result_t result;
+
+ REQUIRE(VALID_SDLZDB(sdlz));
+ if (sdlz->dlzimp->methods->newversion == NULL) {
+ return (ISC_R_NOTIMPLEMENTED);
+ }
+
+ result = getnodedata(db, &sdlz->common.origin, false, 0, NULL, NULL,
+ nodep);
+ if (result != ISC_R_SUCCESS) {
+ sdlz_log(ISC_LOG_ERROR, "sdlz getoriginnode failed: %s",
+ isc_result_totext(result));
+ }
+ return (result);
+}
+
+static dns_dbmethods_t sdlzdb_methods = {
+ attach,
+ detach,
+ beginload,
+ endload,
+ NULL, /* serialize */
+ dump,
+ currentversion,
+ newversion,
+ attachversion,
+ closeversion,
+ findnode,
+ find,
+ findzonecut,
+ attachnode,
+ detachnode,
+ expirenode,
+ printnode,
+ createiterator,
+ findrdataset,
+ allrdatasets,
+ addrdataset,
+ subtractrdataset,
+ deleterdataset,
+ issecure,
+ nodecount,
+ ispersistent,
+ overmem,
+ settask,
+ getoriginnode,
+ NULL, /* transfernode */
+ NULL, /* getnsec3parameters */
+ NULL, /* findnsec3node */
+ NULL, /* setsigningtime */
+ NULL, /* getsigningtime */
+ NULL, /* resigned */
+ NULL, /* isdnssec */
+ NULL, /* getrrsetstats */
+ NULL, /* rpz_attach */
+ NULL, /* rpz_ready */
+ findnodeext,
+ findext,
+ NULL, /* setcachestats */
+ NULL, /* hashsize */
+ NULL, /* nodefullname */
+ NULL, /* getsize */
+ NULL, /* setservestalettl */
+ NULL, /* getservestalettl */
+ NULL, /* setservestalerefresh */
+ NULL, /* getservestalerefresh */
+ NULL, /* setgluecachestats */
+ NULL /* adjusthashsize */
+};
+
+/*
+ * Database Iterator Methods. These methods were "borrowed" from the SDB
+ * driver interface. See the SDB driver interface documentation for more info.
+ */
+
+static void
+dbiterator_destroy(dns_dbiterator_t **iteratorp) {
+ sdlz_dbiterator_t *sdlziter = (sdlz_dbiterator_t *)(*iteratorp);
+ dns_sdlz_db_t *sdlz = (dns_sdlz_db_t *)sdlziter->common.db;
+
+ while (!ISC_LIST_EMPTY(sdlziter->nodelist)) {
+ dns_sdlznode_t *node;
+ node = ISC_LIST_HEAD(sdlziter->nodelist);
+ ISC_LIST_UNLINK(sdlziter->nodelist, node, link);
+ isc_refcount_decrementz(&node->references);
+ destroynode(node);
+ }
+
+ dns_db_detach(&sdlziter->common.db);
+ isc_mem_put(sdlz->common.mctx, sdlziter, sizeof(sdlz_dbiterator_t));
+
+ *iteratorp = NULL;
+}
+
+static isc_result_t
+dbiterator_first(dns_dbiterator_t *iterator) {
+ sdlz_dbiterator_t *sdlziter = (sdlz_dbiterator_t *)iterator;
+
+ sdlziter->current = ISC_LIST_HEAD(sdlziter->nodelist);
+ if (sdlziter->current == NULL) {
+ return (ISC_R_NOMORE);
+ } else {
+ return (ISC_R_SUCCESS);
+ }
+}
+
+static isc_result_t
+dbiterator_last(dns_dbiterator_t *iterator) {
+ sdlz_dbiterator_t *sdlziter = (sdlz_dbiterator_t *)iterator;
+
+ sdlziter->current = ISC_LIST_TAIL(sdlziter->nodelist);
+ if (sdlziter->current == NULL) {
+ return (ISC_R_NOMORE);
+ } else {
+ return (ISC_R_SUCCESS);
+ }
+}
+
+static isc_result_t
+dbiterator_seek(dns_dbiterator_t *iterator, const dns_name_t *name) {
+ sdlz_dbiterator_t *sdlziter = (sdlz_dbiterator_t *)iterator;
+
+ sdlziter->current = ISC_LIST_HEAD(sdlziter->nodelist);
+ while (sdlziter->current != NULL) {
+ if (dns_name_equal(sdlziter->current->name, name)) {
+ return (ISC_R_SUCCESS);
+ }
+ sdlziter->current = ISC_LIST_NEXT(sdlziter->current, link);
+ }
+ return (ISC_R_NOTFOUND);
+}
+
+static isc_result_t
+dbiterator_prev(dns_dbiterator_t *iterator) {
+ sdlz_dbiterator_t *sdlziter = (sdlz_dbiterator_t *)iterator;
+
+ sdlziter->current = ISC_LIST_PREV(sdlziter->current, link);
+ if (sdlziter->current == NULL) {
+ return (ISC_R_NOMORE);
+ } else {
+ return (ISC_R_SUCCESS);
+ }
+}
+
+static isc_result_t
+dbiterator_next(dns_dbiterator_t *iterator) {
+ sdlz_dbiterator_t *sdlziter = (sdlz_dbiterator_t *)iterator;
+
+ sdlziter->current = ISC_LIST_NEXT(sdlziter->current, link);
+ if (sdlziter->current == NULL) {
+ return (ISC_R_NOMORE);
+ } else {
+ return (ISC_R_SUCCESS);
+ }
+}
+
+static isc_result_t
+dbiterator_current(dns_dbiterator_t *iterator, dns_dbnode_t **nodep,
+ dns_name_t *name) {
+ sdlz_dbiterator_t *sdlziter = (sdlz_dbiterator_t *)iterator;
+
+ attachnode(iterator->db, sdlziter->current, nodep);
+ if (name != NULL) {
+ dns_name_copynf(sdlziter->current->name, name);
+ return (ISC_R_SUCCESS);
+ }
+ return (ISC_R_SUCCESS);
+}
+
+static isc_result_t
+dbiterator_pause(dns_dbiterator_t *iterator) {
+ UNUSED(iterator);
+ return (ISC_R_SUCCESS);
+}
+
+static isc_result_t
+dbiterator_origin(dns_dbiterator_t *iterator, dns_name_t *name) {
+ UNUSED(iterator);
+ dns_name_copynf(dns_rootname, name);
+ return (ISC_R_SUCCESS);
+}
+
+/*
+ * Rdataset Methods. These methods were "borrowed" from the SDB driver
+ * interface. See the SDB driver interface documentation for more info.
+ */
+
+static void
+disassociate(dns_rdataset_t *rdataset) {
+ dns_dbnode_t *node = rdataset->private5;
+ dns_sdlznode_t *sdlznode = (dns_sdlznode_t *)node;
+ dns_db_t *db = (dns_db_t *)sdlznode->sdlz;
+
+ detachnode(db, &node);
+ isc__rdatalist_disassociate(rdataset);
+}
+
+static void
+rdataset_clone(dns_rdataset_t *source, dns_rdataset_t *target) {
+ dns_dbnode_t *node = source->private5;
+ dns_sdlznode_t *sdlznode = (dns_sdlznode_t *)node;
+ dns_db_t *db = (dns_db_t *)sdlznode->sdlz;
+ dns_dbnode_t *tempdb = NULL;
+
+ isc__rdatalist_clone(source, target);
+ attachnode(db, node, &tempdb);
+ source->private5 = tempdb;
+}
+
+static dns_rdatasetmethods_t rdataset_methods = {
+ disassociate,
+ isc__rdatalist_first,
+ isc__rdatalist_next,
+ isc__rdatalist_current,
+ rdataset_clone,
+ isc__rdatalist_count,
+ isc__rdatalist_addnoqname,
+ isc__rdatalist_getnoqname,
+ NULL, /* addclosest */
+ NULL, /* getclosest */
+ NULL, /* settrust */
+ NULL, /* expire */
+ NULL, /* clearprefetch */
+ NULL, /* setownercase */
+ NULL, /* getownercase */
+ NULL /* addglue */
+};
+
+static void
+list_tordataset(dns_rdatalist_t *rdatalist, dns_db_t *db, dns_dbnode_t *node,
+ dns_rdataset_t *rdataset) {
+ /*
+ * The sdlz rdataset is an rdatalist with some additions.
+ * - private1 & private2 are used by the rdatalist.
+ * - private3 & private 4 are unused.
+ * - private5 is the node.
+ */
+
+ /* This should never fail. */
+ RUNTIME_CHECK(dns_rdatalist_tordataset(rdatalist, rdataset) ==
+ ISC_R_SUCCESS);
+
+ rdataset->methods = &rdataset_methods;
+ dns_db_attachnode(db, node, &rdataset->private5);
+}
+
+/*
+ * SDLZ core methods. This is the core of the new DLZ functionality.
+ */
+
+/*%
+ * Build a 'bind' database driver structure to be returned by
+ * either the find zone or the allow zone transfer method.
+ * This method is only available in this source file, it is
+ * not made available anywhere else.
+ */
+
+static isc_result_t
+dns_sdlzcreateDBP(isc_mem_t *mctx, void *driverarg, void *dbdata,
+ const dns_name_t *name, dns_rdataclass_t rdclass,
+ dns_db_t **dbp) {
+ isc_result_t result;
+ dns_sdlz_db_t *sdlzdb;
+ dns_sdlzimplementation_t *imp;
+
+ /* check that things are as we expect */
+ REQUIRE(dbp != NULL && *dbp == NULL);
+ REQUIRE(name != NULL);
+
+ imp = (dns_sdlzimplementation_t *)driverarg;
+
+ /* allocate and zero memory for driver structure */
+ sdlzdb = isc_mem_get(mctx, sizeof(dns_sdlz_db_t));
+ memset(sdlzdb, 0, sizeof(dns_sdlz_db_t));
+
+ /* initialize and set origin */
+ dns_name_init(&sdlzdb->common.origin, NULL);
+ result = dns_name_dupwithoffsets(name, mctx, &sdlzdb->common.origin);
+ if (result != ISC_R_SUCCESS) {
+ goto mem_cleanup;
+ }
+
+ /* set the rest of the database structure attributes */
+ sdlzdb->dlzimp = imp;
+ sdlzdb->common.methods = &sdlzdb_methods;
+ sdlzdb->common.attributes = 0;
+ sdlzdb->common.rdclass = rdclass;
+ sdlzdb->common.mctx = NULL;
+ sdlzdb->dbdata = dbdata;
+ isc_refcount_init(&sdlzdb->references, 1);
+
+ /* attach to the memory context */
+ isc_mem_attach(mctx, &sdlzdb->common.mctx);
+
+ /* mark structure as valid */
+ sdlzdb->common.magic = DNS_DB_MAGIC;
+ sdlzdb->common.impmagic = SDLZDB_MAGIC;
+ *dbp = (dns_db_t *)sdlzdb;
+
+ return (result);
+mem_cleanup:
+ isc_mem_put(mctx, sdlzdb, sizeof(dns_sdlz_db_t));
+ return (result);
+}
+
+static isc_result_t
+dns_sdlzallowzonexfr(void *driverarg, void *dbdata, isc_mem_t *mctx,
+ dns_rdataclass_t rdclass, const dns_name_t *name,
+ const isc_sockaddr_t *clientaddr, dns_db_t **dbp) {
+ isc_buffer_t b;
+ isc_buffer_t b2;
+ char namestr[DNS_NAME_MAXTEXT + 1];
+ char clientstr[(sizeof "xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255."
+ "255") +
+ 1];
+ isc_netaddr_t netaddr;
+ isc_result_t result;
+ dns_sdlzimplementation_t *imp;
+
+ /*
+ * Perform checks to make sure data is as we expect it to be.
+ */
+ REQUIRE(driverarg != NULL);
+ REQUIRE(name != NULL);
+ REQUIRE(clientaddr != NULL);
+ REQUIRE(dbp != NULL && *dbp == NULL);
+
+ imp = (dns_sdlzimplementation_t *)driverarg;
+
+ /* Convert DNS name to ascii text */
+ isc_buffer_init(&b, namestr, sizeof(namestr));
+ result = dns_name_totext(name, true, &b);
+ if (result != ISC_R_SUCCESS) {
+ return (result);
+ }
+ isc_buffer_putuint8(&b, 0);
+
+ /* convert client address to ascii text */
+ isc_buffer_init(&b2, clientstr, sizeof(clientstr));
+ isc_netaddr_fromsockaddr(&netaddr, clientaddr);
+ result = isc_netaddr_totext(&netaddr, &b2);
+ if (result != ISC_R_SUCCESS) {
+ return (result);
+ }
+ isc_buffer_putuint8(&b2, 0);
+
+ /* make sure strings are always lowercase */
+ dns_sdlz_tolower(namestr);
+ dns_sdlz_tolower(clientstr);
+
+ /* Call SDLZ driver's find zone method */
+ if (imp->methods->allowzonexfr != NULL) {
+ isc_result_t rresult = ISC_R_SUCCESS;
+
+ MAYBE_LOCK(imp);
+ result = imp->methods->allowzonexfr(imp->driverarg, dbdata,
+ namestr, clientstr);
+ MAYBE_UNLOCK(imp);
+ /*
+ * if zone is supported and transfers are (or might be)
+ * allowed, build a 'bind' database driver
+ */
+ if (result == ISC_R_SUCCESS || result == ISC_R_DEFAULT) {
+ rresult = dns_sdlzcreateDBP(mctx, driverarg, dbdata,
+ name, rdclass, dbp);
+ }
+ if (rresult != ISC_R_SUCCESS) {
+ result = rresult;
+ }
+ return (result);
+ }
+
+ return (ISC_R_NOTIMPLEMENTED);
+}
+
+static isc_result_t
+dns_sdlzcreate(isc_mem_t *mctx, const char *dlzname, unsigned int argc,
+ char *argv[], void *driverarg, void **dbdata) {
+ dns_sdlzimplementation_t *imp;
+ isc_result_t result = ISC_R_NOTFOUND;
+
+ /* Write debugging message to log */
+ sdlz_log(ISC_LOG_DEBUG(2), "Loading SDLZ driver.");
+
+ /*
+ * Performs checks to make sure data is as we expect it to be.
+ */
+ REQUIRE(driverarg != NULL);
+ REQUIRE(dlzname != NULL);
+ REQUIRE(dbdata != NULL);
+ UNUSED(mctx);
+
+ imp = driverarg;
+
+ /* If the create method exists, call it. */
+ if (imp->methods->create != NULL) {
+ MAYBE_LOCK(imp);
+ result = imp->methods->create(dlzname, argc, argv,
+ imp->driverarg, dbdata);
+ MAYBE_UNLOCK(imp);
+ }
+
+ /* Write debugging message to log */
+ if (result == ISC_R_SUCCESS) {
+ sdlz_log(ISC_LOG_DEBUG(2), "SDLZ driver loaded successfully.");
+ } else {
+ sdlz_log(ISC_LOG_ERROR, "SDLZ driver failed to load.");
+ }
+
+ return (result);
+}
+
+static void
+dns_sdlzdestroy(void *driverdata, void **dbdata) {
+ dns_sdlzimplementation_t *imp;
+
+ /* Write debugging message to log */
+ sdlz_log(ISC_LOG_DEBUG(2), "Unloading SDLZ driver.");
+
+ imp = driverdata;
+
+ /* If the destroy method exists, call it. */
+ if (imp->methods->destroy != NULL) {
+ MAYBE_LOCK(imp);
+ imp->methods->destroy(imp->driverarg, dbdata);
+ MAYBE_UNLOCK(imp);
+ }
+}
+
+static isc_result_t
+dns_sdlzfindzone(void *driverarg, void *dbdata, isc_mem_t *mctx,
+ dns_rdataclass_t rdclass, const dns_name_t *name,
+ dns_clientinfomethods_t *methods, dns_clientinfo_t *clientinfo,
+ dns_db_t **dbp) {
+ isc_buffer_t b;
+ char namestr[DNS_NAME_MAXTEXT + 1];
+ isc_result_t result;
+ dns_sdlzimplementation_t *imp;
+
+ /*
+ * Perform checks to make sure data is as we expect it to be.
+ */
+ REQUIRE(driverarg != NULL);
+ REQUIRE(name != NULL);
+ REQUIRE(dbp != NULL && *dbp == NULL);
+
+ imp = (dns_sdlzimplementation_t *)driverarg;
+
+ /* Convert DNS name to ascii text */
+ isc_buffer_init(&b, namestr, sizeof(namestr));
+ result = dns_name_totext(name, true, &b);
+ if (result != ISC_R_SUCCESS) {
+ return (result);
+ }
+ isc_buffer_putuint8(&b, 0);
+
+ /* make sure strings are always lowercase */
+ dns_sdlz_tolower(namestr);
+
+ /* Call SDLZ driver's find zone method */
+ MAYBE_LOCK(imp);
+ result = imp->methods->findzone(imp->driverarg, dbdata, namestr,
+ methods, clientinfo);
+ MAYBE_UNLOCK(imp);
+
+ /*
+ * if zone is supported build a 'bind' database driver
+ * structure to return
+ */
+ if (result == ISC_R_SUCCESS) {
+ result = dns_sdlzcreateDBP(mctx, driverarg, dbdata, name,
+ rdclass, dbp);
+ }
+
+ return (result);
+}
+
+static isc_result_t
+dns_sdlzconfigure(void *driverarg, void *dbdata, dns_view_t *view,
+ dns_dlzdb_t *dlzdb) {
+ isc_result_t result;
+ dns_sdlzimplementation_t *imp;
+
+ REQUIRE(driverarg != NULL);
+
+ imp = (dns_sdlzimplementation_t *)driverarg;
+
+ /* Call SDLZ driver's configure method */
+ if (imp->methods->configure != NULL) {
+ MAYBE_LOCK(imp);
+ result = imp->methods->configure(view, dlzdb, imp->driverarg,
+ dbdata);
+ MAYBE_UNLOCK(imp);
+ } else {
+ result = ISC_R_SUCCESS;
+ }
+
+ return (result);
+}
+
+static bool
+dns_sdlzssumatch(const dns_name_t *signer, const dns_name_t *name,
+ const isc_netaddr_t *tcpaddr, dns_rdatatype_t type,
+ const dst_key_t *key, void *driverarg, void *dbdata) {
+ dns_sdlzimplementation_t *imp;
+ char b_signer[DNS_NAME_FORMATSIZE];
+ char b_name[DNS_NAME_FORMATSIZE];
+ char b_addr[ISC_NETADDR_FORMATSIZE];
+ char b_type[DNS_RDATATYPE_FORMATSIZE];
+ char b_key[DST_KEY_FORMATSIZE];
+ isc_buffer_t *tkey_token = NULL;
+ isc_region_t token_region = { NULL, 0 };
+ uint32_t token_len = 0;
+ bool ret;
+
+ REQUIRE(driverarg != NULL);
+
+ imp = (dns_sdlzimplementation_t *)driverarg;
+ if (imp->methods->ssumatch == NULL) {
+ return (false);
+ }
+
+ /*
+ * Format the request elements. sdlz operates on strings, not
+ * structures
+ */
+ if (signer != NULL) {
+ dns_name_format(signer, b_signer, sizeof(b_signer));
+ } else {
+ b_signer[0] = 0;
+ }
+
+ dns_name_format(name, b_name, sizeof(b_name));
+
+ if (tcpaddr != NULL) {
+ isc_netaddr_format(tcpaddr, b_addr, sizeof(b_addr));
+ } else {
+ b_addr[0] = 0;
+ }
+
+ dns_rdatatype_format(type, b_type, sizeof(b_type));
+
+ if (key != NULL) {
+ dst_key_format(key, b_key, sizeof(b_key));
+ tkey_token = dst_key_tkeytoken(key);
+ } else {
+ b_key[0] = 0;
+ }
+
+ if (tkey_token != NULL) {
+ isc_buffer_region(tkey_token, &token_region);
+ token_len = token_region.length;
+ }
+
+ MAYBE_LOCK(imp);
+ ret = imp->methods->ssumatch(b_signer, b_name, b_addr, b_type, b_key,
+ token_len,
+ token_len != 0 ? token_region.base : NULL,
+ imp->driverarg, dbdata);
+ MAYBE_UNLOCK(imp);
+ return (ret);
+}
+
+static dns_dlzmethods_t sdlzmethods = { dns_sdlzcreate, dns_sdlzdestroy,
+ dns_sdlzfindzone, dns_sdlzallowzonexfr,
+ dns_sdlzconfigure, dns_sdlzssumatch };
+
+/*
+ * Public functions.
+ */
+
+isc_result_t
+dns_sdlz_putrr(dns_sdlzlookup_t *lookup, const char *type, dns_ttl_t ttl,
+ const char *data) {
+ dns_rdatalist_t *rdatalist;
+ dns_rdata_t *rdata;
+ dns_rdatatype_t typeval;
+ isc_consttextregion_t r;
+ isc_buffer_t b;
+ isc_buffer_t *rdatabuf = NULL;
+ isc_lex_t *lex;
+ isc_result_t result;
+ unsigned int size;
+ isc_mem_t *mctx;
+ const dns_name_t *origin;
+
+ REQUIRE(VALID_SDLZLOOKUP(lookup));
+ REQUIRE(type != NULL);
+ REQUIRE(data != NULL);
+
+ mctx = lookup->sdlz->common.mctx;
+
+ r.base = type;
+ r.length = strlen(type);
+ result = dns_rdatatype_fromtext(&typeval, (void *)&r);
+ if (result != ISC_R_SUCCESS) {
+ return (result);
+ }
+
+ rdatalist = ISC_LIST_HEAD(lookup->lists);
+ while (rdatalist != NULL) {
+ if (rdatalist->type == typeval) {
+ break;
+ }
+ rdatalist = ISC_LIST_NEXT(rdatalist, link);
+ }
+
+ if (rdatalist == NULL) {
+ rdatalist = isc_mem_get(mctx, sizeof(dns_rdatalist_t));
+ dns_rdatalist_init(rdatalist);
+ rdatalist->rdclass = lookup->sdlz->common.rdclass;
+ rdatalist->type = typeval;
+ rdatalist->ttl = ttl;
+ ISC_LIST_APPEND(lookup->lists, rdatalist, link);
+ } else if (rdatalist->ttl > ttl) {
+ /*
+ * BIND9 doesn't enforce all RRs in an RRset
+ * having the same TTL, as per RFC 2136,
+ * section 7.12. If a DLZ backend has
+ * different TTLs, then the best
+ * we can do is return the lowest.
+ */
+ rdatalist->ttl = ttl;
+ }
+
+ rdata = isc_mem_get(mctx, sizeof(dns_rdata_t));
+ dns_rdata_init(rdata);
+
+ if ((lookup->sdlz->dlzimp->flags & DNS_SDLZFLAG_RELATIVERDATA) != 0) {
+ origin = &lookup->sdlz->common.origin;
+ } else {
+ origin = dns_rootname;
+ }
+
+ lex = NULL;
+ result = isc_lex_create(mctx, 64, &lex);
+ if (result != ISC_R_SUCCESS) {
+ goto failure;
+ }
+
+ size = initial_size(data);
+ do {
+ isc_buffer_constinit(&b, data, strlen(data));
+ isc_buffer_add(&b, strlen(data));
+
+ result = isc_lex_openbuffer(lex, &b);
+ if (result != ISC_R_SUCCESS) {
+ goto failure;
+ }
+
+ rdatabuf = NULL;
+ isc_buffer_allocate(mctx, &rdatabuf, size);
+
+ result = dns_rdata_fromtext(rdata, rdatalist->rdclass,
+ rdatalist->type, lex, origin, false,
+ mctx, rdatabuf, &lookup->callbacks);
+ if (result != ISC_R_SUCCESS) {
+ isc_buffer_free(&rdatabuf);
+ }
+ if (size >= 65535) {
+ break;
+ }
+ size *= 2;
+ if (size >= 65535) {
+ size = 65535;
+ }
+ } while (result == ISC_R_NOSPACE);
+
+ if (result != ISC_R_SUCCESS) {
+ result = DNS_R_SERVFAIL;
+ goto failure;
+ }
+
+ ISC_LIST_APPEND(rdatalist->rdata, rdata, link);
+ ISC_LIST_APPEND(lookup->buffers, rdatabuf, link);
+
+ if (lex != NULL) {
+ isc_lex_destroy(&lex);
+ }
+
+ return (ISC_R_SUCCESS);
+
+failure:
+ if (rdatabuf != NULL) {
+ isc_buffer_free(&rdatabuf);
+ }
+ if (lex != NULL) {
+ isc_lex_destroy(&lex);
+ }
+ isc_mem_put(mctx, rdata, sizeof(dns_rdata_t));
+
+ return (result);
+}
+
+isc_result_t
+dns_sdlz_putnamedrr(dns_sdlzallnodes_t *allnodes, const char *name,
+ const char *type, dns_ttl_t ttl, const char *data) {
+ dns_name_t *newname;
+ const dns_name_t *origin;
+ dns_fixedname_t fnewname;
+ dns_sdlz_db_t *sdlz = (dns_sdlz_db_t *)allnodes->common.db;
+ dns_sdlznode_t *sdlznode;
+ isc_mem_t *mctx = sdlz->common.mctx;
+ isc_buffer_t b;
+ isc_result_t result;
+
+ newname = dns_fixedname_initname(&fnewname);
+
+ if ((sdlz->dlzimp->flags & DNS_SDLZFLAG_RELATIVERDATA) != 0) {
+ origin = &sdlz->common.origin;
+ } else {
+ origin = dns_rootname;
+ }
+ isc_buffer_constinit(&b, name, strlen(name));
+ isc_buffer_add(&b, strlen(name));
+
+ result = dns_name_fromtext(newname, &b, origin, 0, NULL);
+ if (result != ISC_R_SUCCESS) {
+ return (result);
+ }
+
+ if (allnodes->common.relative_names) {
+ /* All names are relative to the root */
+ unsigned int nlabels = dns_name_countlabels(newname);
+ dns_name_getlabelsequence(newname, 0, nlabels - 1, newname);
+ }
+
+ sdlznode = ISC_LIST_HEAD(allnodes->nodelist);
+ if (sdlznode == NULL || !dns_name_equal(sdlznode->name, newname)) {
+ sdlznode = NULL;
+ result = createnode(sdlz, &sdlznode);
+ if (result != ISC_R_SUCCESS) {
+ return (result);
+ }
+ sdlznode->name = isc_mem_get(mctx, sizeof(dns_name_t));
+ dns_name_init(sdlznode->name, NULL);
+ dns_name_dup(newname, mctx, sdlznode->name);
+ ISC_LIST_PREPEND(allnodes->nodelist, sdlznode, link);
+ if (allnodes->origin == NULL &&
+ dns_name_equal(newname, &sdlz->common.origin))
+ {
+ allnodes->origin = sdlznode;
+ }
+ }
+ return (dns_sdlz_putrr(sdlznode, type, ttl, data));
+}
+
+isc_result_t
+dns_sdlz_putsoa(dns_sdlzlookup_t *lookup, const char *mname, const char *rname,
+ uint32_t serial) {
+ char str[2 * DNS_NAME_MAXTEXT + 5 * (sizeof("2147483647")) + 7];
+ int n;
+
+ REQUIRE(mname != NULL);
+ REQUIRE(rname != NULL);
+
+ n = snprintf(str, sizeof str, "%s %s %u %u %u %u %u", mname, rname,
+ serial, SDLZ_DEFAULT_REFRESH, SDLZ_DEFAULT_RETRY,
+ SDLZ_DEFAULT_EXPIRE, SDLZ_DEFAULT_MINIMUM);
+ if (n >= (int)sizeof(str) || n < 0) {
+ return (ISC_R_NOSPACE);
+ }
+ return (dns_sdlz_putrr(lookup, "SOA", SDLZ_DEFAULT_TTL, str));
+}
+
+isc_result_t
+dns_sdlzregister(const char *drivername, const dns_sdlzmethods_t *methods,
+ void *driverarg, unsigned int flags, isc_mem_t *mctx,
+ dns_sdlzimplementation_t **sdlzimp) {
+ dns_sdlzimplementation_t *imp;
+ isc_result_t result;
+
+ /*
+ * Performs checks to make sure data is as we expect it to be.
+ */
+ REQUIRE(drivername != NULL);
+ REQUIRE(methods != NULL);
+ REQUIRE(methods->findzone != NULL);
+ REQUIRE(methods->lookup != NULL);
+ REQUIRE(mctx != NULL);
+ REQUIRE(sdlzimp != NULL && *sdlzimp == NULL);
+ REQUIRE((flags &
+ ~(DNS_SDLZFLAG_RELATIVEOWNER | DNS_SDLZFLAG_RELATIVERDATA |
+ DNS_SDLZFLAG_THREADSAFE)) == 0);
+
+ /* Write debugging message to log */
+ sdlz_log(ISC_LOG_DEBUG(2), "Registering SDLZ driver '%s'", drivername);
+
+ /*
+ * Allocate memory for a sdlz_implementation object. Error if
+ * we cannot.
+ */
+ imp = isc_mem_get(mctx, sizeof(dns_sdlzimplementation_t));
+
+ /* Make sure memory region is set to all 0's */
+ memset(imp, 0, sizeof(dns_sdlzimplementation_t));
+
+ /* Store the data passed into this method */
+ imp->methods = methods;
+ imp->driverarg = driverarg;
+ imp->flags = flags;
+ imp->mctx = NULL;
+
+ /* attach the new sdlz_implementation object to a memory context */
+ isc_mem_attach(mctx, &imp->mctx);
+
+ /*
+ * initialize the driver lock, error if we cannot
+ * (used if a driver does not support multiple threads)
+ */
+ isc_mutex_init(&imp->driverlock);
+
+ imp->dlz_imp = NULL;
+
+ /*
+ * register the DLZ driver. Pass in our "extra" sdlz information as
+ * a driverarg. (that's why we stored the passed in driver arg in our
+ * sdlz_implementation structure) Also, store the dlz_implementation
+ * structure in our sdlz_implementation.
+ */
+ result = dns_dlzregister(drivername, &sdlzmethods, imp, mctx,
+ &imp->dlz_imp);
+
+ /* if registration fails, cleanup and get outta here. */
+ if (result != ISC_R_SUCCESS) {
+ goto cleanup_mutex;
+ }
+
+ *sdlzimp = imp;
+
+ return (ISC_R_SUCCESS);
+
+cleanup_mutex:
+ /* destroy the driver lock, we don't need it anymore */
+ isc_mutex_destroy(&imp->driverlock);
+
+ /*
+ * return the memory back to the available memory pool and
+ * remove it from the memory context.
+ */
+ isc_mem_putanddetach(&imp->mctx, imp, sizeof(dns_sdlzimplementation_t));
+ return (result);
+}
+
+void
+dns_sdlzunregister(dns_sdlzimplementation_t **sdlzimp) {
+ dns_sdlzimplementation_t *imp;
+
+ /* Write debugging message to log */
+ sdlz_log(ISC_LOG_DEBUG(2), "Unregistering SDLZ driver.");
+
+ /*
+ * Performs checks to make sure data is as we expect it to be.
+ */
+ REQUIRE(sdlzimp != NULL && *sdlzimp != NULL);
+
+ imp = *sdlzimp;
+ *sdlzimp = NULL;
+
+ /* Unregister the DLZ driver implementation */
+ dns_dlzunregister(&imp->dlz_imp);
+
+ /* destroy the driver lock, we don't need it anymore */
+ isc_mutex_destroy(&imp->driverlock);
+
+ /*
+ * return the memory back to the available memory pool and
+ * remove it from the memory context.
+ */
+ isc_mem_putanddetach(&imp->mctx, imp, sizeof(dns_sdlzimplementation_t));
+}
+
+isc_result_t
+dns_sdlz_setdb(dns_dlzdb_t *dlzdatabase, dns_rdataclass_t rdclass,
+ const dns_name_t *name, dns_db_t **dbp) {
+ isc_result_t result;
+
+ result = dns_sdlzcreateDBP(dlzdatabase->mctx,
+ dlzdatabase->implementation->driverarg,
+ dlzdatabase->dbdata, name, rdclass, dbp);
+ return (result);
+}