/* $NetBSD: sdb.c,v 1.11 2023/01/25 21:43:30 christos Exp $ */
/*
* Copyright (C) Internet Systems Consortium, Inc. ("ISC")
*
* SPDX-License-Identifier: MPL-2.0
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, you can obtain one at https://mozilla.org/MPL/2.0/.
*
* See the COPYRIGHT file distributed with this work for additional
* information regarding copyright ownership.
*/
/*! \file */
#include <inttypes.h>
#include <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/refcount.h>
#include <isc/region.h>
#include <isc/util.h>
#include <dns/callbacks.h>
#include <dns/db.h>
#include <dns/dbiterator.h>
#include <dns/fixedname.h>
#include <dns/log.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/sdb.h>
#include <dns/types.h>
#include "rdatalist_p.h"
struct dns_sdbimplementation {
const dns_sdbmethods_t *methods;
void *driverdata;
unsigned int flags;
isc_mem_t *mctx;
isc_mutex_t driverlock;
dns_dbimplementation_t *dbimp;
};
struct dns_sdb {
/* Unlocked */
dns_db_t common;
char *zone;
dns_sdbimplementation_t *implementation;
void *dbdata;
/* Atomic */
isc_refcount_t references;
};
struct dns_sdblookup {
/* Unlocked */
unsigned int magic;
dns_sdb_t *sdb;
ISC_LIST(dns_rdatalist_t) lists;
ISC_LIST(isc_buffer_t) buffers;
dns_name_t *name;
ISC_LINK(dns_sdblookup_t) link;
dns_rdatacallbacks_t callbacks;
/* Atomic */
isc_refcount_t references;
};
typedef struct dns_sdblookup dns_sdbnode_t;
struct dns_sdballnodes {
dns_dbiterator_t common;
ISC_LIST(dns_sdbnode_t) nodelist;
dns_sdbnode_t *current;
dns_sdbnode_t *origin;
};
typedef dns_sdballnodes_t sdb_dbiterator_t;
typedef struct sdb_rdatasetiter {
dns_rdatasetiter_t common;
dns_rdatalist_t *current;
} sdb_rdatasetiter_t;
#define SDB_MAGIC ISC_MAGIC('S', 'D', 'B', '-')
/*%
* Note that "impmagic" is not the first four bytes of the struct, so
* ISC_MAGIC_VALID cannot be used.
*/
#define VALID_SDB(sdb) ((sdb) != NULL && (sdb)->common.impmagic == SDB_MAGIC)
#define SDBLOOKUP_MAGIC ISC_MAGIC('S', 'D', 'B', 'L')
#define VALID_SDBLOOKUP(sdbl) ISC_MAGIC_VALID(sdbl, SDBLOOKUP_MAGIC)
#define VALID_SDBNODE(sdbn) VALID_SDBLOOKUP(sdbn)
/* These values are taken from RFC1537 */
#define SDB_DEFAULT_REFRESH 28800U /* 8 hours */
#define SDB_DEFAULT_RETRY 7200U /* 2 hours */
#define SDB_DEFAULT_EXPIRE 604800U /* 7 days */
#define SDB_DEFAULT_MINIMUM 86400U /* 1 day */
/* This is a reasonable value */
#define SDB_DEFAULT_TTL (60 * 60 * 24)
#ifdef __COVERITY__
#define MAYBE_LOCK(sdb) LOCK(&sdb->implementation->driverlock)
#define MAYBE_UNLOCK(sdb) UNLOCK(&sdb->implementation->driverlock)
#else /* ifdef __COVERITY__ */
#define MAYBE_LOCK(sdb) \
do { \
unsigned int flags = sdb->implementation->flags; \
if ((flags & DNS_SDBFLAG_THREADSAFE) == 0) \
LOCK(&sdb->implementation->driverlock); \
} while (0)
#define MAYBE_UNLOCK(sdb) \
do { \
unsigned int flags = sdb->implementation->flags; \
if ((flags & DNS_SDBFLAG_THREADSAFE) == 0) \
UNLOCK(&sdb->implementation->driverlock); \
} while (0)
#endif /* ifdef __COVERITY__ */
static int dummy;
static isc_result_t
dns_sdb_create(isc_mem_t *mctx, const dns_name_t *origin, dns_dbtype_t type,
dns_rdataclass_t rdclass, unsigned int argc, char *argv[],
void *driverarg, dns_db_t **dbp);
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);
static isc_result_t
createnode(dns_sdb_t *sdb, dns_sdbnode_t **nodep);
static void
destroynode(dns_sdbnode_t *node);
static void
detachnode(dns_db_t *db, dns_dbnode_t **targetp);
static void
list_tordataset(dns_rdatalist_t *rdatalist, dns_db_t *db, dns_dbnode_t *node,
dns_rdataset_t *rdataset);
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
};
static void
rdatasetiter_destroy(dns_rdatasetiter_t **iteratorp);
static isc_result_t
rdatasetiter_first(dns_rdatasetiter_t *iterator);
static isc_result_t
rdatasetiter_next(dns_rdatasetiter_t *iterator);
static void
rdatasetiter_current(dns_rdatasetiter_t *iterator, dns_rdataset_t *rdataset);
static dns_rdatasetitermethods_t rdatasetiter_methods = {
rdatasetiter_destroy, rdatasetiter_first, rdatasetiter_next,
rdatasetiter_current
};
/*
* Functions used by implementors of simple databases
*/
isc_result_t
dns_sdb_register(const char *drivername, const dns_sdbmethods_t *methods,
void *driverdata, unsigned int flags, isc_mem_t *mctx,
dns_sdbimplementation_t **sdbimp) {
dns_sdbimplementation_t *imp;
isc_result_t result;
REQUIRE(drivername != NULL);
REQUIRE(methods != NULL);
REQUIRE(methods->lookup != NULL || methods->lookup2 != NULL);
REQUIRE(mctx != NULL);
REQUIRE(sdbimp != NULL && *sdbimp == NULL);
REQUIRE((flags &
~(DNS_SDBFLAG_RELATIVEOWNER | DNS_SDBFLAG_RELATIVERDATA |
DNS_SDBFLAG_THREADSAFE | DNS_SDBFLAG_DNS64)) == 0);
imp = isc_mem_get(mctx, sizeof(dns_sdbimplementation_t));
imp->methods = methods;
imp->driverdata = driverdata;
imp->flags = flags;
imp->mctx = NULL;
isc_mem_attach(mctx, &imp->mctx);
isc_mutex_init(&imp->driverlock);
imp->dbimp = NULL;
result = dns_db_register(drivername, dns_sdb_create, imp, mctx,
&imp->dbimp);
if (result != ISC_R_SUCCESS) {
goto cleanup_mutex;
}
*sdbimp = imp;
return (ISC_R_SUCCESS);
cleanup_mutex:
isc_mutex_destroy(&imp->driverlock);
isc_mem_put(mctx, imp, sizeof(dns_sdbimplementation_t));
return (result);
}
void
dns_sdb_unregister(dns_sdbimplementation_t **sdbimp) {
dns_sdbimplementation_t *imp;
REQUIRE(sdbimp != NULL && *sdbimp != NULL);
imp = *sdbimp;
*sdbimp = NULL;
dns_db_unregister(&imp->dbimp);
isc_mutex_destroy(&imp->driverlock);
isc_mem_putanddetach(&imp->mctx, imp, sizeof(dns_sdbimplementation_t));
}
static unsigned int
initial_size(unsigned int len) {
unsigned int size;
for (size = 1024; size < (64 * 1024); size *= 2) {
if (len < size) {
return (size);
}
}
return (65535);
}
isc_result_t
dns_sdb_putrdata(dns_sdblookup_t *lookup, dns_rdatatype_t typeval,
dns_ttl_t ttl, const unsigned char *rdatap,
unsigned int rdlen) {
dns_rdatalist_t *rdatalist;
dns_rdata_t *rdata;
isc_buffer_t *rdatabuf = NULL;
isc_mem_t *mctx;
isc_region_t region;
mctx = lookup->sdb->common.mctx;
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->sdb->common.rdclass;
rdatalist->type = typeval;
rdatalist->ttl = ttl;
ISC_LIST_APPEND(lookup->lists, rdatalist, link);
} else if (rdatalist->ttl != ttl) {
return (DNS_R_BADTTL);
}
rdata = isc_mem_get(mctx, sizeof(dns_rdata_t));
isc_buffer_allocate(mctx, &rdatabuf, rdlen);
DE_CONST(rdatap, region.base);
region.length = rdlen;
isc_buffer_copyregion(rdatabuf, ®ion);
isc_buffer_usedregion(rdatabuf, ®ion);
dns_rdata_init(rdata);
dns_rdata_fromregion(rdata, rdatalist->rdclass, rdatalist->type,
®ion);
ISC_LIST_APPEND(rdatalist->rdata, rdata, link);
ISC_LIST_APPEND(lookup->buffers, rdatabuf, link);
return (ISC_R_SUCCESS);
}
isc_result_t
dns_sdb_putrr(dns_sdblookup_t *lookup, const char *type, dns_ttl_t ttl,
const char *data) {
unsigned int datalen;
dns_rdatatype_t typeval;
isc_textregion_t r;
isc_lex_t *lex = NULL;
isc_result_t result;
unsigned char *p = NULL;
unsigned int size = 0; /* Init to suppress compiler warning */
isc_mem_t *mctx;
dns_sdbimplementation_t *imp;
const dns_name_t *origin;
isc_buffer_t b;
isc_buffer_t rb;
REQUIRE(VALID_SDBLOOKUP(lookup));
REQUIRE(type != NULL);
REQUIRE(data != NULL);
mctx = lookup->sdb->common.mctx;
DE_CONST(type, r.base);
r.length = strlen(type);
result = dns_rdatatype_fromtext(&typeval, &r);
if (result != ISC_R_SUCCESS) {
return (result);
}
imp = lookup->sdb->implementation;
if ((imp->flags & DNS_SDBFLAG_RELATIVERDATA) != 0) {
origin = &lookup->sdb->common.origin;
} else {
origin = dns_rootname;
}
result = isc_lex_create(mctx, 64, &lex);
if (result != ISC_R_SUCCESS) {
goto failure;
}
datalen = strlen(data);
size = initial_size(datalen);
do {
isc_buffer_constinit(&b, data, datalen);
isc_buffer_add(&b, datalen);
result = isc_lex_openbuffer(lex, &b);
if (result != ISC_R_SUCCESS) {
goto failure;
}
if (size >= 65535) {
size = 65535;
}
p = isc_mem_get(mctx, size);
isc_buffer_init(&rb, p, size);
result = dns_rdata_fromtext(NULL, lookup->sdb->common.rdclass,
typeval, lex, origin, 0, mctx, &rb,
&lookup->callbacks);
if (result != ISC_R_NOSPACE) {
break;
}
/*
* Is the RR too big?
*/
if (size >= 65535) {
break;
}
isc_mem_put(mctx, p, size);
p = NULL;
size *= 2;
} while (result == ISC_R_NOSPACE);
if (result != ISC_R_SUCCESS) {
goto failure;
}
result = dns_sdb_putrdata(lookup, typeval, ttl, isc_buffer_base(&rb),
isc_buffer_usedlength(&rb));
failure:
if (p != NULL) {
isc_mem_put(mctx, p, size);
}
if (lex != NULL) {
isc_lex_destroy(&lex);
}
return (result);
}
static isc_result_t
getnode(dns_sdballnodes_t *allnodes, const char *name, dns_sdbnode_t **nodep) {
dns_name_t *newname;
const dns_name_t *origin;
dns_fixedname_t fnewname;
dns_sdb_t *sdb = (dns_sdb_t *)allnodes->common.db;
dns_sdbimplementation_t *imp = sdb->implementation;
dns_sdbnode_t *sdbnode;
isc_mem_t *mctx = sdb->common.mctx;
isc_buffer_t b;
isc_result_t result;
newname = dns_fixedname_initname(&fnewname);
if ((imp->flags & DNS_SDBFLAG_RELATIVERDATA) != 0) {
origin = &sdb->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);
}
sdbnode = ISC_LIST_HEAD(allnodes->nodelist);
if (sdbnode == NULL || !dns_name_equal(sdbnode->name, newname)) {
sdbnode = NULL;
result = createnode(sdb, &sdbnode);
if (result != ISC_R_SUCCESS) {
return (result);
}
sdbnode->name = isc_mem_get(mctx, sizeof(dns_name_t));
dns_name_init(sdbnode->name, NULL);
dns_name_dup(newname, mctx, sdbnode->name);
ISC_LIST_PREPEND(allnodes->nodelist, sdbnode, link);
if (allnodes->origin == NULL &&
dns_name_equal(newname, &sdb->common.origin))
{
allnodes->origin = sdbnode;
}
}
*nodep = sdbnode;
return (ISC_R_SUCCESS);
}
isc_result_t
dns_sdb_putnamedrr(dns_sdballnodes_t *allnodes, const char *name,
const char *type, dns_ttl_t ttl, const char *data) {
isc_result_t result;
dns_sdbnode_t *sdbnode = NULL;
result = getnode(allnodes, name, &sdbnode);
if (result != ISC_R_SUCCESS) {
return (result);
}
return (dns_sdb_putrr(sdbnode, type, ttl, data));
}
isc_result_t
dns_sdb_putnamedrdata(dns_sdballnodes_t *allnodes, const char *name,
dns_rdatatype_t type, dns_ttl_t ttl, const void *rdata,
unsigned int rdlen) {
isc_result_t result;
dns_sdbnode_t *sdbnode = NULL;
result = getnode(allnodes, name, &sdbnode);
if (result != ISC_R_SUCCESS) {
return (result);
}
return (dns_sdb_putrdata(sdbnode, type, ttl, rdata, rdlen));
}
isc_result_t
dns_sdb_putsoa(dns_sdblookup_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, SDB_DEFAULT_REFRESH, SDB_DEFAULT_RETRY,
SDB_DEFAULT_EXPIRE, SDB_DEFAULT_MINIMUM);
if (n >= (int)sizeof(str) || n < 0) {
return (ISC_R_NOSPACE);
}
return (dns_sdb_putrr(lookup, "SOA", SDB_DEFAULT_TTL, str));
}
/*
* DB routines
*/
static void
attach(dns_db_t *source, dns_db_t **targetp) {
dns_sdb_t *sdb = (dns_sdb_t *)source;
REQUIRE(VALID_SDB(sdb));
isc_refcount_increment(&sdb->references);
*targetp = source;
}
static void
destroy(dns_sdb_t *sdb) {
dns_sdbimplementation_t *imp = sdb->implementation;
isc_refcount_destroy(&sdb->references);
if (imp->methods->destroy != NULL) {
MAYBE_LOCK(sdb);
imp->methods->destroy(sdb->zone, imp->driverdata, &sdb->dbdata);
MAYBE_UNLOCK(sdb);
}
isc_mem_free(sdb->common.mctx, sdb->zone);
sdb->common.magic = 0;
sdb->common.impmagic = 0;
dns_name_free(&sdb->common.origin, sdb->common.mctx);
isc_mem_putanddetach(&sdb->common.mctx, sdb, sizeof(dns_sdb_t));
}
static void
detach(dns_db_t **dbp) {
dns_sdb_t *sdb = (dns_sdb_t *)(*dbp);
REQUIRE(VALID_SDB(sdb));
*dbp = NULL;
if (isc_refcount_decrement(&sdb->references) == 1) {
destroy(sdb);
}
}
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) {
REQUIRE(versionp != NULL && *versionp == NULL);
UNUSED(db);
*versionp = (void *)&dummy;
return;
}
static isc_result_t
newversion(dns_db_t *db, dns_dbversion_t **versionp) {
UNUSED(db);
UNUSED(versionp);
return (ISC_R_NOTIMPLEMENTED);
}
static void
attachversion(dns_db_t *db, dns_dbversion_t *source,
dns_dbversion_t **targetp) {
REQUIRE(source != NULL && source == (void *)&dummy);
REQUIRE(targetp != NULL && *targetp == NULL);
UNUSED(db);
*targetp = source;
return;
}
static void
closeversion(dns_db_t *db, dns_dbversion_t **versionp, bool commit) {
REQUIRE(versionp != NULL && *versionp == (void *)&dummy);
REQUIRE(!commit);
UNUSED(db);
UNUSED(commit);
*versionp = NULL;
}
static isc_result_t
createnode(dns_sdb_t *sdb, dns_sdbnode_t **nodep) {
dns_sdbnode_t *node;
node = isc_mem_get(sdb->common.mctx, sizeof(dns_sdbnode_t));
node->sdb = NULL;
attach((dns_db_t *)sdb, (dns_db_t **)(void *)&node->sdb);
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 = SDBLOOKUP_MAGIC;
*nodep = node;
return (ISC_R_SUCCESS);
}
static void
destroynode(dns_sdbnode_t *node) {
dns_rdatalist_t *list;
dns_rdata_t *rdata;
isc_buffer_t *b;
dns_sdb_t *sdb;
isc_mem_t *mctx;
sdb = node->sdb;
mctx = sdb->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_sdbnode_t));
detach((dns_db_t **)(void *)&sdb);
}
static isc_result_t
getoriginnode(dns_db_t *db, dns_dbnode_t **nodep) {
dns_sdb_t *sdb = (dns_sdb_t *)db;
dns_sdbnode_t *node = NULL;
isc_result_t result;
isc_buffer_t b;
char namestr[DNS_NAME_MAXTEXT + 1];
dns_sdbimplementation_t *imp;
dns_name_t relname;
dns_name_t *name;
REQUIRE(VALID_SDB(sdb));
REQUIRE(nodep != NULL && *nodep == NULL);
imp = sdb->implementation;
name = &sdb->common.origin;
if (imp->methods->lookup2 != NULL) {
if ((imp->flags & DNS_SDBFLAG_RELATIVEOWNER) != 0) {
dns_name_init(&relname, NULL);
name = &relname;
}
} else {
isc_buffer_init(&b, namestr, sizeof(namestr));
if ((imp->flags & DNS_SDBFLAG_RELATIVEOWNER) != 0) {
dns_name_init(&relname, NULL);
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);
}
result = createnode(sdb, &node);
if (result != ISC_R_SUCCESS) {
return (result);
}
MAYBE_LOCK(sdb);
if (imp->methods->lookup2 != NULL) {
result = imp->methods->lookup2(&sdb->common.origin, name,
sdb->dbdata, node, NULL, NULL);
} else {
result = imp->methods->lookup(sdb->zone, namestr, sdb->dbdata,
node, NULL, NULL);
}
MAYBE_UNLOCK(sdb);
if (result != ISC_R_SUCCESS &&
!(result == ISC_R_NOTFOUND && imp->methods->authority != NULL))
{
destroynode(node);
return (result);
}
if (imp->methods->authority != NULL) {
MAYBE_LOCK(sdb);
result = imp->methods->authority(sdb->zone, sdb->dbdata, node);
MAYBE_UNLOCK(sdb);
if (result != ISC_R_SUCCESS) {
destroynode(node);
return (result);
}
}
*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) {
dns_sdb_t *sdb = (dns_sdb_t *)db;
dns_sdbnode_t *node = NULL;
isc_result_t result;
isc_buffer_t b;
char namestr[DNS_NAME_MAXTEXT + 1];
bool isorigin;
dns_sdbimplementation_t *imp;
dns_name_t relname;
unsigned int labels;
REQUIRE(VALID_SDB(sdb));
REQUIRE(nodep != NULL && *nodep == NULL);
UNUSED(name);
UNUSED(create);
imp = sdb->implementation;
isorigin = dns_name_equal(name, &sdb->common.origin);
if (imp->methods->lookup2 != NULL) {
if ((imp->flags & DNS_SDBFLAG_RELATIVEOWNER) != 0) {
labels = dns_name_countlabels(name) -
dns_name_countlabels(&db->origin);
dns_name_init(&relname, NULL);
dns_name_getlabelsequence(name, 0, labels, &relname);
name = &relname;
}
} else {
isc_buffer_init(&b, namestr, sizeof(namestr));
if ((imp->flags & DNS_SDBFLAG_RELATIVEOWNER) != 0) {
labels = dns_name_countlabels(name) -
dns_name_countlabels(&db->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);
}
result = createnode(sdb, &node);
if (result != ISC_R_SUCCESS) {
return (result);
}
MAYBE_LOCK(sdb);
if (imp->methods->lookup2 != NULL) {
result = imp->methods->lookup2(&sdb->common.origin, name,
sdb->dbdata, node, methods,
clientinfo);
} else {
result = imp->methods->lookup(sdb->zone, namestr, sdb->dbdata,
node, methods, clientinfo);
}
MAYBE_UNLOCK(sdb);
if (result != ISC_R_SUCCESS && !(result == ISC_R_NOTFOUND && isorigin &&
imp->methods->authority != NULL))
{
destroynode(node);
return (result);
}
if (isorigin && imp->methods->authority != NULL) {
MAYBE_LOCK(sdb);
result = imp->methods->authority(sdb->zone, sdb->dbdata, node);
MAYBE_UNLOCK(sdb);
if (result != ISC_R_SUCCESS) {
destroynode(node);
return (result);
}
}
*nodep = node;
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_sdb_t *sdb = (dns_sdb_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;
unsigned int flags;
REQUIRE(VALID_SDB(sdb));
REQUIRE(nodep == NULL || *nodep == NULL);
REQUIRE(version == NULL || version == (void *)&dummy);
UNUSED(options);
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;
flags = sdb->implementation->flags;
i = (flags & DNS_SDBFLAG_DNS64) != 0 ? nlabels : olabels;
for (; i <= nlabels; i++) {
/*
* Look up the next label.
*/
dns_name_getlabelsequence(name, nlabels - i, i, xname);
result = findnodeext(db, xname, false, methods, clientinfo,
&node);
if (result == ISC_R_NOTFOUND) {
/*
* No data at zone apex?
*/
if (i == olabels) {
return (DNS_R_BADDB);
}
result = DNS_R_NXDOMAIN;
continue;
}
if (result != ISC_R_SUCCESS) {
return (result);
}
/*
* DNS64 zone's don't have DNAME or NS records.
*/
if ((flags & DNS_SDBFLAG_DNS64) != 0) {
goto skip;
}
/*
* DNS64 zone's don't have DNAME or NS records.
*/
if ((flags & DNS_SDBFLAG_DNS64) != 0) {
goto skip;
}
/*
* 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 or glue is ok.
*/
if (i != olabels && (options & DNS_DBFIND_GLUEOK) == 0) {
result = findrdataset(db, node, version,
dns_rdatatype_ns, 0, now,
rdataset, sigrdataset);
if (result == ISC_R_SUCCESS) {
if (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);
}
} else {
result = DNS_R_DELEGATION;
}
break;
}
}
/*
* If the current name is not the qname, add another label
* and try again.
*/
if (i < nlabels) {
destroynode(node);
node = NULL;
continue;
}
skip:
/*
* 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
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_sdb_t *sdb = (dns_sdb_t *)db;
dns_sdbnode_t *node = (dns_sdbnode_t *)source;
REQUIRE(VALID_SDB(sdb));
UNUSED(sdb);
isc_refcount_increment(&node->references);
*targetp = source;
}
static void
detachnode(dns_db_t *db, dns_dbnode_t **targetp) {
dns_sdb_t *sdb = (dns_sdb_t *)db;
dns_sdbnode_t *node;
REQUIRE(VALID_SDB(sdb));
REQUIRE(targetp != NULL && *targetp != NULL);
UNUSED(sdb);
node = (dns_sdbnode_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_sdb_t *sdb = (dns_sdb_t *)db;
REQUIRE(VALID_SDB(sdb));
sdb_dbiterator_t *sdbiter;
isc_result_t result;
dns_sdbimplementation_t *imp = sdb->implementation;
if (imp->methods->allnodes == NULL) {
return (ISC_R_NOTIMPLEMENTED);
}
if ((options & DNS_DB_NSEC3ONLY) != 0 ||
(options & DNS_DB_NONSEC3) != 0)
{
return (ISC_R_NOTIMPLEMENTED);
}
sdbiter = isc_mem_get(sdb->common.mctx, sizeof(sdb_dbiterator_t));
sdbiter->common.methods = &dbiterator_methods;
sdbiter->common.db = NULL;
dns_db_attach(db, &sdbiter->common.db);
sdbiter->common.relative_names = ((options & DNS_DB_RELATIVENAMES) !=
0);
sdbiter->common.magic = DNS_DBITERATOR_MAGIC;
ISC_LIST_INIT(sdbiter->nodelist);
sdbiter->current = NULL;
sdbiter->origin = NULL;
MAYBE_LOCK(sdb);
result = imp->methods->allnodes(sdb->zone, sdb->dbdata, sdbiter);
MAYBE_UNLOCK(sdb);
if (result != ISC_R_SUCCESS) {
dbiterator_destroy((dns_dbiterator_t **)(void *)&sdbiter);
return (result);
}
if (sdbiter->origin != NULL) {
ISC_LIST_UNLINK(sdbiter->nodelist, sdbiter->origin, link);
ISC_LIST_PREPEND(sdbiter->nodelist, sdbiter->origin, link);
}
*iteratorp = (dns_dbiterator_t *)sdbiter;
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_SDBNODE(node));
dns_rdatalist_t *list;
dns_sdbnode_t *sdbnode = (dns_sdbnode_t *)node;
UNUSED(db);
UNUSED(version);
UNUSED(covers);
UNUSED(now);
UNUSED(sigrdataset);
if (type == dns_rdatatype_rrsig) {
return (ISC_R_NOTIMPLEMENTED);
}
list = ISC_LIST_HEAD(sdbnode->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
allrdatasets(dns_db_t *db, dns_dbnode_t *node, dns_dbversion_t *version,
unsigned int options, isc_stdtime_t now,
dns_rdatasetiter_t **iteratorp) {
sdb_rdatasetiter_t *iterator;
REQUIRE(version == NULL || version == &dummy);
UNUSED(version);
UNUSED(now);
iterator = isc_mem_get(db->mctx, sizeof(sdb_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
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) {
UNUSED(db);
UNUSED(node);
UNUSED(version);
UNUSED(now);
UNUSED(rdataset);
UNUSED(options);
UNUSED(addedrdataset);
return (ISC_R_NOTIMPLEMENTED);
}
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) {
UNUSED(db);
UNUSED(node);
UNUSED(version);
UNUSED(rdataset);
UNUSED(options);
UNUSED(newrdataset);
return (ISC_R_NOTIMPLEMENTED);
}
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) {
UNUSED(db);
UNUSED(node);
UNUSED(version);
UNUSED(type);
UNUSED(covers);
return (ISC_R_NOTIMPLEMENTED);
}
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);
}
static dns_dbmethods_t sdb_methods = {
attach,
detach,
beginload,
endload,
NULL, /* serialize */
dump,
currentversion,
newversion,
attachversion,
closeversion,
NULL, /* findnode */
NULL, /* find */
findzonecut,
attachnode,
detachnode,
expirenode,
printnode,
createiterator,
findrdataset,
allrdatasets,
addrdataset,
subtractrdataset,
deleterdataset,
issecure,
nodecount,
ispersistent,
overmem,
settask,
getoriginnode, /* 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 */
};
static isc_result_t
dns_sdb_create(isc_mem_t *mctx, const dns_name_t *origin, dns_dbtype_t type,
dns_rdataclass_t rdclass, unsigned int argc, char *argv[],
void *driverarg, dns_db_t **dbp) {
dns_sdb_t *sdb;
isc_result_t result;
char zonestr[DNS_NAME_MAXTEXT + 1];
isc_buffer_t b;
dns_sdbimplementation_t *imp;
REQUIRE(driverarg != NULL);
imp = driverarg;
if (type != dns_dbtype_zone) {
return (ISC_R_NOTIMPLEMENTED);
}
sdb = isc_mem_get(mctx, sizeof(dns_sdb_t));
memset(sdb, 0, sizeof(dns_sdb_t));
dns_name_init(&sdb->common.origin, NULL);
sdb->common.attributes = 0;
sdb->common.methods = &sdb_methods;
sdb->common.rdclass = rdclass;
sdb->common.mctx = NULL;
sdb->implementation = imp;
isc_mem_attach(mctx, &sdb->common.mctx);
result = dns_name_dupwithoffsets(origin, mctx, &sdb->common.origin);
if (result != ISC_R_SUCCESS) {
goto cleanup_lock;
}
isc_buffer_init(&b, zonestr, sizeof(zonestr));
result = dns_name_totext(origin, true, &b);
if (result != ISC_R_SUCCESS) {
goto cleanup_origin;
}
isc_buffer_putuint8(&b, 0);
sdb->zone = isc_mem_strdup(mctx, zonestr);
sdb->dbdata = NULL;
if (imp->methods->create != NULL) {
MAYBE_LOCK(sdb);
result = imp->methods->create(sdb->zone, argc, argv,
imp->driverdata, &sdb->dbdata);
MAYBE_UNLOCK(sdb);
if (result != ISC_R_SUCCESS) {
goto cleanup_zonestr;
}
}
isc_refcount_init(&sdb->references, 1);
sdb->common.magic = DNS_DB_MAGIC;
sdb->common.impmagic = SDB_MAGIC;
*dbp = (dns_db_t *)sdb;
return (ISC_R_SUCCESS);
cleanup_zonestr:
isc_mem_free(mctx, sdb->zone);
cleanup_origin:
dns_name_free(&sdb->common.origin, mctx);
cleanup_lock:
isc_mem_putanddetach(&mctx, sdb, sizeof(dns_sdb_t));
return (result);
}
/*
* Rdataset Methods
*/
static void
disassociate(dns_rdataset_t *rdataset) {
dns_dbnode_t *node = rdataset->private5;
dns_sdbnode_t *sdbnode = (dns_sdbnode_t *)node;
dns_db_t *db = (dns_db_t *)sdbnode->sdb;
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_sdbnode_t *sdbnode = (dns_sdbnode_t *)node;
dns_db_t *db = (dns_db_t *)sdbnode->sdb;
dns_dbnode_t *tempdb = NULL;
isc__rdatalist_clone(source, target);
attachnode(db, node, &tempdb);
source->private5 = tempdb;
}
static dns_rdatasetmethods_t sdb_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 sdb 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 = &sdb_rdataset_methods;
dns_db_attachnode(db, node, &rdataset->private5);
}
/*
* Database Iterator Methods
*/
static void
dbiterator_destroy(dns_dbiterator_t **iteratorp) {
sdb_dbiterator_t *sdbiter = (sdb_dbiterator_t *)(*iteratorp);
dns_sdb_t *sdb = (dns_sdb_t *)sdbiter->common.db;
while (!ISC_LIST_EMPTY(sdbiter->nodelist)) {
dns_sdbnode_t *node;
node = ISC_LIST_HEAD(sdbiter->nodelist);
ISC_LIST_UNLINK(sdbiter->nodelist, node, link);
destroynode(node);
}
dns_db_detach(&sdbiter->common.db);
isc_mem_put(sdb->common.mctx, sdbiter, sizeof(sdb_dbiterator_t));
*iteratorp = NULL;
}
static isc_result_t
dbiterator_first(dns_dbiterator_t *iterator) {
sdb_dbiterator_t *sdbiter = (sdb_dbiterator_t *)iterator;
sdbiter->current = ISC_LIST_HEAD(sdbiter->nodelist);
if (sdbiter->current == NULL) {
return (ISC_R_NOMORE);
} else {
return (ISC_R_SUCCESS);
}
}
static isc_result_t
dbiterator_last(dns_dbiterator_t *iterator) {
sdb_dbiterator_t *sdbiter = (sdb_dbiterator_t *)iterator;
sdbiter->current = ISC_LIST_TAIL(sdbiter->nodelist);
if (sdbiter->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) {
sdb_dbiterator_t *sdbiter = (sdb_dbiterator_t *)iterator;
sdbiter->current = ISC_LIST_HEAD(sdbiter->nodelist);
while (sdbiter->current != NULL) {
if (dns_name_equal(sdbiter->current->name, name)) {
return (ISC_R_SUCCESS);
}
sdbiter->current = ISC_LIST_NEXT(sdbiter->current, link);
}
return (ISC_R_NOTFOUND);
}
static isc_result_t
dbiterator_prev(dns_dbiterator_t *iterator) {
sdb_dbiterator_t *sdbiter = (sdb_dbiterator_t *)iterator;
sdbiter->current = ISC_LIST_PREV(sdbiter->current, link);
if (sdbiter->current == NULL) {
return (ISC_R_NOMORE);
} else {
return (ISC_R_SUCCESS);
}
}
static isc_result_t
dbiterator_next(dns_dbiterator_t *iterator) {
sdb_dbiterator_t *sdbiter = (sdb_dbiterator_t *)iterator;
sdbiter->current = ISC_LIST_NEXT(sdbiter->current, link);
if (sdbiter->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) {
sdb_dbiterator_t *sdbiter = (sdb_dbiterator_t *)iterator;
attachnode(iterator->db, sdbiter->current, nodep);
if (name != NULL) {
dns_name_copynf(sdbiter->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 Iterator Methods
*/
static void
rdatasetiter_destroy(dns_rdatasetiter_t **iteratorp) {
sdb_rdatasetiter_t *sdbiterator = (sdb_rdatasetiter_t *)(*iteratorp);
detachnode(sdbiterator->common.db, &sdbiterator->common.node);
isc_mem_put(sdbiterator->common.db->mctx, sdbiterator,
sizeof(sdb_rdatasetiter_t));
*iteratorp = NULL;
}
static isc_result_t
rdatasetiter_first(dns_rdatasetiter_t *iterator) {
sdb_rdatasetiter_t *sdbiterator = (sdb_rdatasetiter_t *)iterator;
dns_sdbnode_t *sdbnode = (dns_sdbnode_t *)iterator->node;
if (ISC_LIST_EMPTY(sdbnode->lists)) {
return (ISC_R_NOMORE);
}
sdbiterator->current = ISC_LIST_HEAD(sdbnode->lists);
return (ISC_R_SUCCESS);
}
static isc_result_t
rdatasetiter_next(dns_rdatasetiter_t *iterator) {
sdb_rdatasetiter_t *sdbiterator = (sdb_rdatasetiter_t *)iterator;
sdbiterator->current = ISC_LIST_NEXT(sdbiterator->current, link);
if (sdbiterator->current == NULL) {
return (ISC_R_NOMORE);
} else {
return (ISC_R_SUCCESS);
}
}
static void
rdatasetiter_current(dns_rdatasetiter_t *iterator, dns_rdataset_t *rdataset) {
sdb_rdatasetiter_t *sdbiterator = (sdb_rdatasetiter_t *)iterator;
list_tordataset(sdbiterator->current, iterator->db, iterator->node,
rdataset);
}