sdlz.c revision ab381c1e22e0ed732170428937d20d13146d863a
/*
* Portions Copyright (C) 2005-2009 Internet Systems Consortium, Inc. ("ISC")
* Portions Copyright (C) 1999-2001 Internet Software Consortium.
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
* REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
* AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
* INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
* LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
* OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
* PERFORMANCE OF THIS SOFTWARE.
*/
/*
* 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.
*/
/* $Id: sdlz.c,v 1.20 2009/04/21 23:48:04 tbox Exp $ */
/*! \file */
#include <config.h>
#include <string.h>
#include <isc/buffer.h>
#include <isc/lex.h>
#include <isc/log.h>
#include <isc/rwlock.h>
#include <isc/string.h>
#include <isc/util.h>
#include <isc/magic.h>
#include <isc/mem.h>
#include <isc/once.h>
#include <isc/print.h>
#include <isc/region.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/rdata.h>
#include <dns/rdatalist.h>
#include <dns/rdataset.h>
#include <dns/rdatasetiter.h>
#include <dns/rdatatype.h>
#include <dns/result.h>
#include <dns/master.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;
isc_mutex_t refcnt_lock;
/* Locked */
unsigned int references;
};
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;
isc_mutex_t lock;
dns_rdatacallbacks_t callbacks;
/* Locked */
unsigned int 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 (60 * 60 * 8)
#define SDLZ_DEFAULT_RETRY (60 * 60 * 2)
#define SDLZ_DEFAULT_EXPIRE (60 * 60 * 24 * 7)
#define SDLZ_DEFAULT_MINIMUM (60 * 60 * 24)
/* This is a reasonable value */
#define SDLZ_DEFAULT_TTL (60 * 60 * 24)
static int dummy;
#ifdef __COVERITY__
#define MAYBE_LOCK(imp) LOCK(&imp->driverlock)
#define MAYBE_UNLOCK(imp) UNLOCK(&imp->driverlock)
#else
#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
/*
* Forward references. Try to keep these to a minimum.
*/
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,
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
*/
/*% 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 inline 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));
LOCK(&sdlz->refcnt_lock);
REQUIRE(sdlz->references > 0);
sdlz->references++;
UNLOCK(&sdlz->refcnt_lock);
*targetp = source;
}
static void
destroy(dns_sdlz_db_t *sdlz) {
isc_mem_t *mctx;
mctx = sdlz->common.mctx;
sdlz->common.magic = 0;
sdlz->common.impmagic = 0;
isc_mutex_destroy(&sdlz->refcnt_lock);
dns_name_free(&sdlz->common.origin, mctx);
isc_mem_put(mctx, sdlz, sizeof(dns_sdlz_db_t));
isc_mem_detach(&mctx);
}
static void
detach(dns_db_t **dbp) {
dns_sdlz_db_t *sdlz = (dns_sdlz_db_t *)(*dbp);
isc_boolean_t need_destroy = ISC_FALSE;
REQUIRE(VALID_SDLZDB(sdlz));
LOCK(&sdlz->refcnt_lock);
REQUIRE(sdlz->references > 0);
sdlz->references--;
if (sdlz->references == 0)
need_destroy = ISC_TRUE;
UNLOCK(&sdlz->refcnt_lock);
if (need_destroy)
destroy(sdlz);
*dbp = NULL;
}
static isc_result_t
beginload(dns_db_t *db, dns_addrdatasetfunc_t *addp, dns_dbload_t **dbloadp) {
UNUSED(db);
UNUSED(addp);
UNUSED(dbloadp);
return (ISC_R_NOTIMPLEMENTED);
}
static isc_result_t
endload(dns_db_t *db, dns_dbload_t **dbloadp) {
UNUSED(db);
UNUSED(dbloadp);
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);
UNUSED(db);
UNUSED(source);
UNUSED(targetp);
*targetp = source;
}
static void
closeversion(dns_db_t *db, dns_dbversion_t **versionp, isc_boolean_t commit) {
REQUIRE(versionp != NULL && *versionp == (void *) &dummy);
REQUIRE(commit == ISC_FALSE);
UNUSED(db);
UNUSED(commit);
*versionp = NULL;
}
static isc_result_t
createnode(dns_sdlz_db_t *sdlz, dns_sdlznode_t **nodep) {
dns_sdlznode_t *node;
isc_result_t result;
node = isc_mem_get(sdlz->common.mctx, sizeof(dns_sdlznode_t));
if (node == NULL)
return (ISC_R_NOMEMORY);
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;
result = isc_mutex_init(&node->lock);
if (result != ISC_R_SUCCESS) {
UNEXPECTED_ERROR(__FILE__, __LINE__,
"isc_mutex_init() failed: %s",
isc_result_totext(result));
isc_mem_put(sdlz->common.mctx, node, sizeof(dns_sdlznode_t));
return (ISC_R_UNEXPECTED);
}
dns_rdatacallbacks_init(&node->callbacks);
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;
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));
}
DESTROYLOCK(&node->lock);
node->magic = 0;
isc_mem_put(mctx, node, sizeof(dns_sdlznode_t));
db = &sdlz->common;
detach(&db);
}
static isc_result_t
findnode(dns_db_t *db, dns_name_t *name, isc_boolean_t create,
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];
isc_boolean_t isorigin;
dns_sdlzauthorityfunc_t authority;
REQUIRE(VALID_SDLZDB(sdlz));
REQUIRE(create == ISC_FALSE);
REQUIRE(nodep != NULL && *nodep == NULL);
UNUSED(name);
UNUSED(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(&db->origin);
dns_name_init(&relname, NULL);
dns_name_getlabelsequence(name, 0, labels, &relname);
result = dns_name_totext(&relname, ISC_TRUE, &b);
if (result != ISC_R_SUCCESS)
return (result);
} else {
result = dns_name_totext(name, ISC_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, ISC_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);
/*
* if the host (namestr) was not found, try to lookup a
* "wildcard" host.
*/
if (result != ISC_R_SUCCESS) {
result = sdlz->dlzimp->methods->lookup(zonestr, "*",
sdlz->dlzimp->driverarg,
sdlz->dbdata, node);
}
MAYBE_UNLOCK(sdlz->dlzimp);
if (result != ISC_R_SUCCESS && !isorigin) {
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) {
destroynode(node);
return (result);
}
}
*nodep = node;
return (ISC_R_SUCCESS);
}
static isc_result_t
findzonecut(dns_db_t *db, dns_name_t *name, unsigned int options,
isc_stdtime_t now, dns_dbnode_t **nodep, dns_name_t *foundname,
dns_rdataset_t *rdataset, dns_rdataset_t *sigrdataset)
{
UNUSED(db);
UNUSED(name);
UNUSED(options);
UNUSED(now);
UNUSED(nodep);
UNUSED(foundname);
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);
LOCK(&node->lock);
INSIST(node->references > 0);
node->references++;
INSIST(node->references != 0); /* Catch overflow. */
UNLOCK(&node->lock);
*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;
isc_boolean_t need_destroy = ISC_FALSE;
REQUIRE(VALID_SDLZDB(sdlz));
REQUIRE(targetp != NULL && *targetp != NULL);
UNUSED(sdlz);
node = (dns_sdlznode_t *)(*targetp);
LOCK(&node->lock);
INSIST(node->references > 0);
node->references--;
if (node->references == 0)
need_destroy = ISC_TRUE;
UNLOCK(&node->lock);
if (need_destroy)
destroynode(node);
*targetp = NULL;
}
static isc_result_t
expirenode(dns_db_t *db, dns_dbnode_t *node, isc_stdtime_t now) {
UNUSED(db);
UNUSED(node);
UNUSED(now);
INSIST(0);
return (ISC_R_UNEXPECTED);
}
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, ISC_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));
if (sdlziter == NULL)
return (ISC_R_NOMEMORY);
sdlziter->common.methods = &dbiterator_methods;
sdlziter->common.db = NULL;
dns_db_attach(db, &sdlziter->common.db);
sdlziter->common.relative_names = ISC_TF(options & DNS_DB_RELATIVENAMES);
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)
{
dns_rdatalist_t *list;
dns_sdlznode_t *sdlznode = (dns_sdlznode_t *)node;
REQUIRE(VALID_SDLZNODE(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
find(dns_db_t *db, 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)
{
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 *) &dummy);
UNUSED(options);
UNUSED(sdlz);
if (!dns_name_issubdomain(name, &db->origin))
return (DNS_R_NXDOMAIN);
olabels = dns_name_countlabels(&db->origin);
nlabels = dns_name_countlabels(name);
dns_fixedname_init(&fname);
xname = dns_fixedname_name(&fname);
if (rdataset == NULL) {
dns_rdataset_init(&xrdataset);
rdataset = &xrdataset;
}
result = DNS_R_NXDOMAIN;
for (i = olabels; i <= nlabels; i++) {
/*
* Unless this is an explicit lookup at the origin, don't
* look at the origin.
*/
if (i == olabels && i != nlabels)
continue;
/*
* Look up the next label.
*/
dns_name_getlabelsequence(name, nlabels - i, i, xname);
result = findnode(db, xname, ISC_FALSE, &node);
if (result != ISC_R_SUCCESS) {
result = DNS_R_NXDOMAIN;
continue;
}
/*
* 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;
}
/*
* 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) {
isc_result_t xresult;
xresult = dns_name_copy(xname, foundname, NULL);
if (xresult != ISC_R_SUCCESS) {
if (node != NULL)
destroynode(node);
if (dns_rdataset_isassociated(rdataset))
dns_rdataset_disassociate(rdataset);
return (DNS_R_BADDB);
}
}
if (nodep != NULL)
*nodep = node;
else if (node != NULL)
detachnode(db, &node);
return (result);
}
static isc_result_t
allrdatasets(dns_db_t *db, dns_dbnode_t *node, dns_dbversion_t *version,
isc_stdtime_t now, dns_rdatasetiter_t **iteratorp)
{
sdlz_rdatasetiter_t *iterator;
REQUIRE(version == NULL || version == &dummy);
UNUSED(version);
UNUSED(now);
iterator = isc_mem_get(db->mctx, sizeof(sdlz_rdatasetiter_t));
if (iterator == NULL)
return (ISC_R_NOMEMORY);
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.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 isc_boolean_t
issecure(dns_db_t *db) {
UNUSED(db);
return (ISC_FALSE);
}
static unsigned int
nodecount(dns_db_t *db) {
UNUSED(db);
return (0);
}
static isc_boolean_t
ispersistent(dns_db_t *db) {
UNUSED(db);
return (ISC_TRUE);
}
static void
overmem(dns_db_t *db, isc_boolean_t overmem) {
UNUSED(db);
UNUSED(overmem);
}
static void
settask(dns_db_t *db, isc_task_t *task) {
UNUSED(db);
UNUSED(task);
}
static dns_dbmethods_t sdlzdb_methods = {
attach,
detach,
beginload,
endload,
dump,
currentversion,
newversion,
attachversion,
closeversion,
findnode,
find,
findzonecut,
attachnode,
detachnode,
expirenode,
printnode,
createiterator,
findrdataset,
allrdatasets,
addrdataset,
subtractrdataset,
deleterdataset,
issecure,
nodecount,
ispersistent,
overmem,
settask,
NULL,
NULL,
NULL,
NULL,
NULL,
NULL,
NULL,
NULL,
NULL
};
/*
* 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);
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, 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);
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)
return (dns_name_copy(sdlziter->current->name, name, NULL));
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);
return (dns_name_copy(dns_rootname, name, NULL));
}
/*
* 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,
NULL,
NULL,
NULL,
NULL
};
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,
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));
if (sdlzdb == NULL)
return (ISC_R_NOMEMORY);
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;
/* initialize the reference count mutex */
result = isc_mutex_init(&sdlzdb->refcnt_lock);
if (result != ISC_R_SUCCESS)
goto name_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;
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);
/*
* reference count mutex could not be initialized, clean up
* name memory
*/
name_cleanup:
dns_name_free(&sdlzdb->common.origin, mctx);
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, dns_name_t *name,
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, ISC_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) {
MAYBE_LOCK(imp);
result = imp->methods->allowzonexfr(imp->driverarg, dbdata,
namestr, clientstr);
MAYBE_UNLOCK(imp);
/*
* if zone is supported and transfers allowed build a 'bind'
* database driver
*/
if (result == ISC_R_SUCCESS)
result = dns_sdlzcreateDBP(mctx, driverarg, dbdata,
name, rdclass, dbp);
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 */
isc_log_write(dns_lctx, DNS_LOGCATEGORY_DATABASE,
DNS_LOGMODULE_DLZ, 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) {
isc_log_write(dns_lctx, DNS_LOGCATEGORY_DATABASE,
DNS_LOGMODULE_DLZ, ISC_LOG_DEBUG(2),
"SDLZ driver loaded successfully.");
} else {
isc_log_write(dns_lctx, DNS_LOGCATEGORY_DATABASE,
DNS_LOGMODULE_DLZ, 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 */
isc_log_write(dns_lctx, DNS_LOGCATEGORY_DATABASE,
DNS_LOGMODULE_DLZ, 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, dns_name_t *name, 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, ISC_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);
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 dns_dlzmethods_t sdlzmethods = {
dns_sdlzcreate,
dns_sdlzdestroy,
dns_sdlzfindzone,
dns_sdlzallowzonexfr
};
/*
* 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;
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));
if (rdatalist == NULL)
return (ISC_R_NOMEMORY);
rdatalist->rdclass = lookup->sdlz->common.rdclass;
rdatalist->type = typeval;
rdatalist->covers = 0;
rdatalist->ttl = ttl;
ISC_LIST_INIT(rdatalist->rdata);
ISC_LINK_INIT(rdatalist, link);
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));
if (rdata == NULL)
return (ISC_R_NOMEMORY);
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_init(&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;
result = isc_buffer_allocate(mctx, &rdatabuf, size);
if (result != ISC_R_SUCCESS)
goto failure;
result = dns_rdata_fromtext(rdata, rdatalist->rdclass,
rdatalist->type, lex,
origin, ISC_FALSE,
mctx, rdatabuf,
&lookup->callbacks);
if (result != ISC_R_SUCCESS)
isc_buffer_free(&rdatabuf);
size *= 2;
} while (result == ISC_R_NOSPACE);
if (result != ISC_R_SUCCESS)
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, *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;
dns_fixedname_init(&fnewname);
newname = dns_fixedname_name(&fnewname);
if ((sdlz->dlzimp->flags & DNS_SDLZFLAG_RELATIVERDATA) != 0)
origin = &sdlz->common.origin;
else
origin = dns_rootname;
isc_buffer_init(&b, name, strlen(name));
isc_buffer_add(&b, strlen(name));
result = dns_name_fromtext(newname, &b, origin, ISC_FALSE, 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));
if (sdlznode->name == NULL) {
destroynode(sdlznode);
return (ISC_R_NOMEMORY);
}
dns_name_init(sdlznode->name, NULL);
result = dns_name_dup(newname, mctx, sdlznode->name);
if (result != ISC_R_SUCCESS) {
isc_mem_put(mctx, sdlznode->name, sizeof(dns_name_t));
destroynode(sdlznode);
return (result);
}
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,
isc_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 */
isc_log_write(dns_lctx, DNS_LOGCATEGORY_DATABASE,
DNS_LOGMODULE_DLZ, 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));
if (imp == NULL)
return (ISC_R_NOMEMORY);
/* 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)
*/
result = isc_mutex_init(&imp->driverlock);
if (result != ISC_R_SUCCESS) {
UNEXPECTED_ERROR(__FILE__, __LINE__,
"isc_mutex_init() failed: %s",
isc_result_totext(result));
goto cleanup_mctx;
}
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 */
DESTROYLOCK(&imp->driverlock);
cleanup_mctx:
/*
* return the memory back to the available memory pool and
* remove it from the memory context.
*/
isc_mem_put(mctx, imp, sizeof(dns_sdlzimplementation_t));
isc_mem_detach(&mctx);
return (result);
}
void
dns_sdlzunregister(dns_sdlzimplementation_t **sdlzimp) {
dns_sdlzimplementation_t *imp;
isc_mem_t *mctx;
/* Write debugging message to log */
isc_log_write(dns_lctx, DNS_LOGCATEGORY_DATABASE,
DNS_LOGMODULE_DLZ, 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;
/* Unregister the DLZ driver implementation */
dns_dlzunregister(&imp->dlz_imp);
/* destroy the driver lock, we don't need it anymore */
DESTROYLOCK(&imp->driverlock);
mctx = imp->mctx;
/*
* return the memory back to the available memory pool and
* remove it from the memory context.
*/
isc_mem_put(mctx, imp, sizeof(dns_sdlzimplementation_t));
isc_mem_detach(&mctx);
*sdlzimp = NULL;
}