File: sdlz_helper.h

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/*
 * 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.
 */

#ifndef SDLZHELPER_H
#define SDLZHELPER_H

/*
 * Types
 */
#define SDLZH_REQUIRE_CLIENT	0x01
#define SDLZH_REQUIRE_QUERY	0x02
#define SDLZH_REQUIRE_RECORD	0x04
#define SDLZH_REQUIRE_ZONE	0x08

typedef struct query_segment query_segment_t;
typedef ISC_LIST(query_segment_t) query_list_t;
typedef struct dbinstance dbinstance_t;
typedef ISC_LIST(dbinstance_t) db_list_t;
typedef struct driverinstance driverinstance_t;

/*%
 * a query segment is all the text between our special tokens
 * special tokens are %zone%, %record%, %client%
 */
struct query_segment {
	void				*sql;
	unsigned int			strlen;
	isc_boolean_t			direct;
	ISC_LINK(query_segment_t)	link;
};

/*%
 * a database instance contains everything we need for running
 * a query against the database.  Using it each separate thread
 * can dynamically construct a query and execute it against the
 * database.  The "instance_lock" and locking code in the driver's
 * make sure no two threads try to use the same DBI at a time.
 */
struct dbinstance {
	void			*dbconn;
	query_list_t		*allnodes_q;
	query_list_t		*allowxfr_q;
	query_list_t		*authority_q;
	query_list_t		*findzone_q;
	query_list_t		*lookup_q;
	query_list_t		*countzone_q;
	char			*query_buf;
	char			*zone;
	char			*record;
	char			*client;
	isc_mem_t		*mctx;
	isc_mutex_t		instance_lock;
	ISC_LINK(dbinstance_t)	link;
};

/*
 * Method declarations
 */

/* see the code in sdlz_helper.c for more information on these methods */

char *
sdlzh_build_querystring(isc_mem_t *mctx, query_list_t *querylist);

isc_result_t
sdlzh_build_sqldbinstance(isc_mem_t *mctx, const char *allnodes_str,
			  const char *allowxfr_str, const char *authority_str,
			  const char *findzone_str, const char *lookup_str,
			  const char *countzone_str, dbinstance_t **dbi);

void
sdlzh_destroy_sqldbinstance(dbinstance_t *dbi);

char *
sdlzh_get_parameter_value(isc_mem_t *mctx, const char *input, const char* key);

/* Compatability with existing DLZ drivers */

#define	build_querystring	sdlzh_build_querystring
#define	build_sqldbinstance	sdlzh_build_sqldbinstance
#define	destroy_sqldbinstance	sdlzh_destroy_sqldbinstance

#define	getParameterValue(x,y)  sdlzh_get_parameter_value(ns_g_mctx, (x), (y))

#endif /* SDLZHELPER_H */