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/*
* Portions Copyright (C) Internet Systems Consortium, Inc. ("ISC")
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, you can obtain one at 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 dns/sdlz.h */
#ifndef SDLZ_H
#define SDLZ_H 1
#include <inttypes.h>
#include <stdbool.h>
#include <dns/clientinfo.h>
#include <dns/dlz.h>
ISC_LANG_BEGINDECLS
#define DNS_SDLZFLAG_THREADSAFE 0x00000001U
#define DNS_SDLZFLAG_RELATIVEOWNER 0x00000002U
#define DNS_SDLZFLAG_RELATIVERDATA 0x00000004U
/* A simple DLZ database. */
typedef struct dns_sdlz_db dns_sdlz_db_t;
/* A simple DLZ database lookup in progress. */
typedef struct dns_sdlzlookup dns_sdlzlookup_t;
/* A simple DLZ database traversal in progress. */
typedef struct dns_sdlzallnodes dns_sdlzallnodes_t;
typedef isc_result_t (*dns_sdlzallnodesfunc_t)(const char *zone,
void *driverarg,
void *dbdata,
dns_sdlzallnodes_t *allnodes);
/*%<
* Method prototype. Drivers implementing the SDLZ interface may
* supply an all nodes method. This method is called when the DNS
* server is performing a zone transfer query, after the allow zone
* transfer method has been called. This method is only called if the
* allow zone transfer method returned ISC_R_SUCCESS. This method and
* the allow zone transfer method are both required for zone transfers
* to be supported. If the driver generates data dynamically (instead
* of searching in a database for it) it should not implement this
* function as a zone transfer would be meaningless. A SDLZ driver
* does not have to implement an all nodes method.
*/
typedef isc_result_t (*dns_sdlzallowzonexfr_t)(void *driverarg,
void *dbdata, const char *name,
const char *client);
/*%<
* Method prototype. Drivers implementing the SDLZ interface may
* supply an allow zone transfer method. This method is called when
* the DNS server is performing a zone transfer query, before the all
* nodes method can be called. This method and the all node method
* are both required for zone transfers to be supported. If the
* driver generates data dynamically (instead of searching in a
* database for it) it should not implement this function as a zone
* transfer would be meaningless. A SDLZ driver does not have to
* implement an allow zone transfer method.
*
* This method should return ISC_R_SUCCESS if the zone is supported by
* the database and a zone transfer is allowed for the specified
* client. If the zone is supported by the database, but zone
* transfers are not allowed for the specified client this method
* should return ISC_R_NOPERM.. Lastly the method should return
* ISC_R_NOTFOUND if the zone is not supported by the database. If an
* error occurs it should return a result code indicating the type of
* error.
*/
typedef isc_result_t (*dns_sdlzauthorityfunc_t)(const char *zone,
void *driverarg, void *dbdata,
dns_sdlzlookup_t *lookup);
/*%<
* Method prototype. Drivers implementing the SDLZ interface may
* supply an authority method. This method is called when the DNS
* server is performing a query, after both the find zone and lookup
* methods have been called. This method is required if the lookup
* function does not supply authority information for the dns
* record. A SDLZ driver does not have to implement an authority
* method.
*/
typedef isc_result_t (*dns_sdlzcreate_t)(const char *dlzname,
unsigned int argc, char *argv[],
void *driverarg, void **dbdata);
/*%<
* Method prototype. Drivers implementing the SDLZ interface may
* supply a create method. This method is called when the DNS server
* is starting up and creating drivers for use later. A SDLZ driver
* does not have to implement a create method.
*/
typedef void (*dns_sdlzdestroy_t)(void *driverarg, void *dbdata);
/*%<
* Method prototype. Drivers implementing the SDLZ interface may
* supply a destroy method. This method is called when the DNS server
* is shutting down and no longer needs the driver. A SDLZ driver does
* not have to implement a destroy method.
*/
typedef isc_result_t
(*dns_sdlzfindzone_t)(void *driverarg, void *dbdata, const char *name,
dns_clientinfomethods_t *methods,
dns_clientinfo_t *clientinfo);
/*%<
* Method prototype. Drivers implementing the SDLZ interface MUST
* supply a find zone method. This method is called when the DNS
* server is performing a query to to determine if 'name' is a
* supported dns zone. The find zone method will be called with the
* longest possible name first, and continue to be called with
* successively shorter domain names, until any of the following
* occur:
*
* \li 1) the function returns (ISC_R_SUCCESS) indicating a zone name
* match.
*
* \li 2) a problem occurs, and the functions returns anything other than
* (ISC_R_NOTFOUND)
*
* \li 3) we run out of domain name labels. I.E. we have tried the
* shortest domain name
*
* \li 4) the number of labels in the domain name is less than min_labels
* for dns_dlzfindzone
*
* The driver's find zone method should return ISC_R_SUCCESS if the
* zone is supported by the database. Otherwise it should return
* ISC_R_NOTFOUND, if the zone is not supported. If an error occurs
* it should return a result code indicating the type of error.
*/
typedef isc_result_t
(*dns_sdlzlookupfunc_t)(const char *zone, const char *name, void *driverarg,
void *dbdata, dns_sdlzlookup_t *lookup,
dns_clientinfomethods_t *methods,
dns_clientinfo_t *clientinfo);
/*%<
* Method prototype. Drivers implementing the SDLZ interface MUST
* supply a lookup method. This method is called when the
* DNS server is performing a query, after the find zone and before any
* other methods have been called. This function returns DNS record
* information using the dns_sdlz_putrr and dns_sdlz_putsoa functions.
* If this function supplies authority information for the DNS record
* the authority method is not required. If it does not, the
* authority function is required.
*
* The 'methods' and 'clientinfo' args allow an SDLZ driver to retrieve
* information about the querying client (such as source IP address)
* from the caller.
*/
typedef isc_result_t (*dns_sdlznewversion_t)(const char *zone,
void *driverarg, void *dbdata,
void **versionp);
/*%<
* Method prototype. Drivers implementing the SDLZ interface may
* supply a newversion method. This method is called to start a
* write transaction on a zone and should only be implemented by
* writeable backends.
* When implemented, the driver should create a new transaction, and
* fill *versionp with a pointer to the transaction state. The
* closeversion function will be called to close the transaction.
*/
typedef void (*dns_sdlzcloseversion_t)(const char *zone, bool commit,
void *driverarg, void *dbdata,
void **versionp);
/*%<
* Method prototype. Drivers implementing the SDLZ interface must
* supply a closeversion method if they supply a newversion method.
* When implemented, the driver should close the given transaction,
* committing changes if 'commit' is true. If 'commit' is not true
* then all changes should be discarded and the database rolled back.
* If the call is successful then *versionp should be set to NULL
*/
typedef isc_result_t (*dns_sdlzconfigure_t)(dns_view_t *view,
dns_dlzdb_t *dlzdb,
void *driverarg, void *dbdata);
/*%<
* Method prototype. Drivers implementing the SDLZ interface may
* supply a configure method. When supplied, it will be called
* immediately after the create method to give the driver a chance
* to configure writeable zones
*/
typedef bool (*dns_sdlzssumatch_t)(const char *signer,
const char *name,
const char *tcpaddr,
const char *type,
const char *key,
uint32_t keydatalen,
unsigned char *keydata,
void *driverarg,
void *dbdata);
/*%<
* Method prototype. Drivers implementing the SDLZ interface may
* supply a ssumatch method. If supplied, then ssumatch will be
* called to authorize any zone updates. The driver should return
* true to allow the update, and false to deny it. For a DLZ
* controlled zone, this is the only access control on updates.
*/
typedef isc_result_t (*dns_sdlzmodrdataset_t)(const char *name,
const char *rdatastr,
void *driverarg, void *dbdata,
void *version);
/*%<
* Method prototype. Drivers implementing the SDLZ interface may
* supply addrdataset and subtractrdataset methods. If supplied, then these
* will be called when rdatasets are added/subtracted during
* updates. The version parameter comes from a call to the sdlz
* newversion() method from the driver. The rdataset parameter is a
* linearise string representation of the rdataset change. The format
* is the same as used by dig when displaying records. The fields are
* tab delimited.
*/
typedef isc_result_t (*dns_sdlzdelrdataset_t)(const char *name,
const char *type,
void *driverarg, void *dbdata,
void *version);
/*%<
* Method prototype. Drivers implementing the SDLZ interface may
* supply a delrdataset method. If supplied, then this
* function will be called when rdatasets are deleted during
* updates. The call should remove all rdatasets of the given type for
* the specified name.
*/
typedef struct dns_sdlzmethods {
dns_sdlzcreate_t create;
dns_sdlzdestroy_t destroy;
dns_sdlzfindzone_t findzone;
dns_sdlzlookupfunc_t lookup;
dns_sdlzauthorityfunc_t authority;
dns_sdlzallnodesfunc_t allnodes;
dns_sdlzallowzonexfr_t allowzonexfr;
dns_sdlznewversion_t newversion;
dns_sdlzcloseversion_t closeversion;
dns_sdlzconfigure_t configure;
dns_sdlzssumatch_t ssumatch;
dns_sdlzmodrdataset_t addrdataset;
dns_sdlzmodrdataset_t subtractrdataset;
dns_sdlzdelrdataset_t delrdataset;
} dns_sdlzmethods_t;
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);
/*%<
* Register a dynamically loadable zones (dlz) driver for the database
* type 'drivername', implemented by the functions in '*methods'.
*
* sdlzimp must point to a NULL dns_sdlzimplementation_t pointer.
* That is, sdlzimp != NULL && *sdlzimp == NULL. It will be assigned
* a value that will later be used to identify the driver when
* deregistering it.
*/
void
dns_sdlzunregister(dns_sdlzimplementation_t **sdlzimp);
/*%<
* Removes the sdlz driver from the list of registered sdlz drivers.
* There must be no active sdlz drivers of this type when this
* function is called.
*/
typedef isc_result_t dns_sdlz_putnamedrr_t(dns_sdlzallnodes_t *allnodes,
const char *name,
const char *type,
dns_ttl_t ttl,
const char *data);
dns_sdlz_putnamedrr_t dns_sdlz_putnamedrr;
/*%<
* Add a single resource record to the allnodes structure to be later
* parsed into a zone transfer response.
*/
typedef isc_result_t dns_sdlz_putrr_t(dns_sdlzlookup_t *lookup,
const char *type,
dns_ttl_t ttl,
const char *data);
dns_sdlz_putrr_t dns_sdlz_putrr;
/*%<
* Add a single resource record to the lookup structure to be later
* parsed into a query response.
*/
typedef isc_result_t dns_sdlz_putsoa_t(dns_sdlzlookup_t *lookup,
const char *mname,
const char *rname,
uint32_t serial);
dns_sdlz_putsoa_t dns_sdlz_putsoa;
/*%<
* This function may optionally be called from the 'authority'
* callback to simplify construction of the SOA record for 'zone'. It
* will provide a SOA listing 'mname' as as the master server and
* 'rname' as the responsible person mailbox. It is the
* responsibility of the driver to increment the serial number between
* responses if necessary. All other SOA fields will have reasonable
* default values.
*/
typedef isc_result_t dns_sdlz_setdb_t(dns_dlzdb_t *dlzdatabase,
dns_rdataclass_t rdclass,
dns_name_t *name,
dns_db_t **dbp);
dns_sdlz_setdb_t dns_sdlz_setdb;
/*%<
* Create the database pointers for a writeable SDLZ zone
*/
ISC_LANG_ENDDECLS
#endif /* SDLZ_H */