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sdb.h
/* * 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. */ #ifndef DNS_SDB_H #define DNS_SDB_H 1 /***** ***** Module Info *****/ /*! \file dns/sdb.h * \brief * Simple database API. */ /*** *** Imports ***/ #include <inttypes.h> #include <isc/lang.h> #include <dns/clientinfo.h> #include <dns/types.h> /*** *** Types ***/ /*% * A simple database. This is an opaque type. */ typedef struct dns_sdb dns_sdb_t; /*% * A simple database lookup in progress. This is an opaque type. */ typedef struct dns_sdblookup dns_sdblookup_t; /*% * A simple database traversal in progress. This is an opaque type. */ typedef struct dns_sdballnodes dns_sdballnodes_t; typedef isc_result_t (*dns_sdblookupfunc_t)(const char *zone, const char *name, void *dbdata, dns_sdblookup_t *lookup, dns_clientinfomethods_t *methods, dns_clientinfo_t *clientinfo); typedef isc_result_t (*dns_sdblookup2func_t)(const dns_name_t *zone, const dns_name_t *name, void *dbdata, dns_sdblookup_t *lookup, dns_clientinfomethods_t *methods, dns_clientinfo_t *clientinfo); typedef isc_result_t (*dns_sdbauthorityfunc_t)(const char *zone, void *dbdata, dns_sdblookup_t *); typedef isc_result_t (*dns_sdballnodesfunc_t)(const char *zone, void *dbdata, dns_sdballnodes_t *allnodes); typedef isc_result_t (*dns_sdbcreatefunc_t)(const char *zone, int argc, char **argv, void *driverdata, void **dbdata); typedef void (*dns_sdbdestroyfunc_t)(const char *zone, void *driverdata, void **dbdata); typedef struct dns_sdbmethods { dns_sdblookupfunc_t lookup; dns_sdbauthorityfunc_t authority; dns_sdballnodesfunc_t allnodes; dns_sdbcreatefunc_t create; dns_sdbdestroyfunc_t destroy; dns_sdblookup2func_t lookup2; } dns_sdbmethods_t; /*** *** Functions ***/ ISC_LANG_BEGINDECLS #define DNS_SDBFLAG_RELATIVEOWNER 0x00000001U #define DNS_SDBFLAG_RELATIVERDATA 0x00000002U #define DNS_SDBFLAG_THREADSAFE 0x00000004U #define DNS_SDBFLAG_DNS64 0x00000008U 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); /*%< * Register a simple database driver for the database type 'drivername', * implemented by the functions in '*methods'. * * sdbimp must point to a NULL dns_sdbimplementation_t pointer. That is, * sdbimp != NULL && *sdbimp == NULL. It will be assigned a value that * will later be used to identify the driver when deregistering it. * * The name server will perform lookups in the database by calling the * function 'lookup', passing it a printable zone name 'zone', a printable * domain name 'name', and a copy of the argument 'dbdata' that * was potentially returned by the create function. The 'dns_sdblookup_t' * argument to 'lookup' and 'authority' is an opaque pointer to be passed to * ns_sdb_putrr(). * * The lookup function returns the lookup results to the name server * by calling ns_sdb_putrr() once for each record found. On success, * the return value of the lookup function should be ISC_R_SUCCESS. * If the domain name 'name' does not exist, the lookup function should * ISC_R_NOTFOUND. Any other return value is treated as an error. * * Lookups at the zone apex will cause the server to also call the * function 'authority' (if non-NULL), which must provide an SOA record * and NS records for the zone by calling ns_sdb_putrr() once for each of * these records. The 'authority' function may be NULL if invoking * the 'lookup' function on the zone apex will return SOA and NS records. * * The allnodes function, if non-NULL, fills in an opaque structure to be * used by a database iterator. This allows the zone to be transferred. * This may use a considerable amount of memory for large zones, and the * zone transfer may not be fully RFC1035 compliant if the zone is * frequently changed. * * The create function will be called for each zone configured * into the name server using this database type. It can be used * to create a "database object" containing zone specific data, * which can make use of the database arguments specified in the * name server configuration. * * The destroy function will be called to free the database object * when its zone is destroyed. * * The create and destroy functions may be NULL. * * If flags includes DNS_SDBFLAG_RELATIVEOWNER, the lookup and authority * functions will be called with relative names rather than absolute names. * The string "@" represents the zone apex in this case. * * If flags includes DNS_SDBFLAG_RELATIVERDATA, the rdata strings may * include relative names. Otherwise, all names in the rdata string must * be absolute. Be aware that if relative names are allowed, any * absolute names must contain a trailing dot. * * If flags includes DNS_SDBFLAG_THREADSAFE, the driver must be able to * handle multiple lookups in parallel. Otherwise, calls into the driver * are serialized. */ void dns_sdb_unregister(dns_sdbimplementation_t **sdbimp); /*%< * Removes the simple database driver from the list of registered database * types. There must be no active databases of this type when this function * is called. */ /*% See dns_sdb_putradata() */ isc_result_t dns_sdb_putrr(dns_sdblookup_t *lookup, const char *type, dns_ttl_t ttl, const char *data); isc_result_t dns_sdb_putrdata(dns_sdblookup_t *lookup, dns_rdatatype_t type, dns_ttl_t ttl, const unsigned char *rdata, unsigned int rdlen); /*%< * Add a single resource record to the lookup structure to be * returned in the query response. dns_sdb_putrr() takes the * resource record in master file text format as a null-terminated * string, and dns_sdb_putrdata() takes the raw RDATA in * uncompressed wire format. */ /*% See dns_sdb_putnamerdata() */ 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 dns_sdb_putnamedrdata(dns_sdballnodes_t *allnodes, const char *name, dns_rdatatype_t type, dns_ttl_t ttl, const void *rdata, unsigned int rdlen); /*%< * Add a single resource record to the allnodes structure to be * included in a zone transfer response, in text or wire * format as above. */ isc_result_t dns_sdb_putsoa(dns_sdblookup_t *lookup, const char *mname, const char *rname, uint32_t serial); /*%< * 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. */ ISC_LANG_ENDDECLS #endif /* DNS_SDB_H */
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