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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 http://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 <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, isc_boolean_t 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 ISC_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 isc_boolean_t (*dns_sdlzssumatch_t)(const char *signer, const char *name, const char *tcpaddr, const char *type, const char *key, isc_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 * ISC_TRUE to allow the update, and ISC_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, isc_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 */