/*	$NetBSD: proto-sql.h,v 1.3 2021/08/14 16:15:01 christos Exp $	*/

/* $OpenLDAP$ */
/* This work is part of OpenLDAP Software <http://www.openldap.org/>.
 *
 * Copyright 1999-2021 The OpenLDAP Foundation.
 * Portions Copyright 1999 Dmitry Kovalev.
 * Portions Copyright 2002 Pierangelo Mararati.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted only as authorized by the OpenLDAP
 * Public License.
 *
 * A copy of this license is available in the file LICENSE in the
 * top-level directory of the distribution or, alternatively, at
 * <http://www.OpenLDAP.org/license.html>.
 */
/* ACKNOWLEDGEMENTS:
 * This work was initially developed by Dmitry Kovalev for inclusion
 * by OpenLDAP Software.  Additional significant contributors include
 * Pierangelo Masarati
 */

/*
 * The following changes have been addressed:
 *	 
 * Enhancements:
 *   - re-styled code for better readability
 *   - upgraded backend API to reflect recent changes
 *   - LDAP schema is checked when loading SQL/LDAP mapping
 *   - AttributeDescription/ObjectClass pointers used for more efficient
 *     mapping lookup
 *   - bervals used where string length is required often
 *   - atomized write operations by committing at the end of each operation
 *     and defaulting connection closure to rollback
 *   - added LDAP access control to write operations
 *   - fully implemented modrdn (with rdn attrs change, deleteoldrdn,
 *     access check, parent/children check and more)
 *   - added parent access control, children control to delete operation
 *   - added structuralObjectClass operational attribute check and
 *     value return on search
 *   - added hasSubordinate operational attribute on demand
 *   - search limits are appropriately enforced
 *   - function backsql_strcat() has been made more efficient
 *   - concat function has been made configurable by means of a pattern
 *   - added config switches:
 *       - fail_if_no_mapping	write operations fail if there is no mapping
 *       - has_ldapinfo_dn_ru	overrides autodetect
 *       - concat_pattern	a string containing two '?' is used
 * 				(note that "?||?" should be more portable
 * 				than builtin function "CONCAT(?,?)")
 *       - strcast_func		cast of string constants in "SELECT DISTINCT
 *				statements (needed by PostgreSQL)
 *       - upper_needs_cast	cast the argument of upper when required
 * 				(basically when building dn substring queries)
 *   - added noop control
 *   - added values return filter control
 *   - hasSubordinate can be used in search filters (with limitations)
 *   - eliminated oc->name; use oc->oc->soc_cname instead
 * 
 * Todo:
 *   - add security checks for SQL statements that can be injected (?)
 *   - re-test with previously supported RDBMs
 *   - replace dn_ru and so with normalized dn (no need for upper() and so
 *     in dn match)
 *   - implement a backsql_normalize() function to replace the upper()
 *     conversion routines
 *   - note that subtree deletion, subtree renaming and so could be easily
 *     implemented (rollback and consistency checks are available :)
 *   - implement "lastmod" and other operational stuff (ldap_entries table ?)
 *   - check how to allow multiple operations with one statement, to remove
 *     BACKSQL_REALLOC_STMT from modify.c (a more recent unixODBC lib?)
 */

#ifndef PROTO_SQL_H
#define PROTO_SQL_H

#include "back-sql.h"

/*
 * add.c
 */
int backsql_modify_delete_all_values(
	Operation 		*op,
	SlapReply		*rs,
	SQLHDBC			dbh, 
	backsql_entryID		*e_id,
	backsql_at_map_rec	*at );

int backsql_modify_internal(
	Operation 		*op,
	SlapReply		*rs,
	SQLHDBC			dbh, 
	backsql_oc_map_rec	*oc,
	backsql_entryID		*e_id,
	Modifications		*modlist );

/*
 * api.c
 */
int backsql_api_config( backsql_info *bi, const char *name,
		int argc, char *argv[] );
int backsql_api_destroy( backsql_info *bi );
int backsql_api_register( backsql_api *ba );
int backsql_api_dn2odbc( Operation *op, SlapReply *rs, struct berval *dn );
int backsql_api_odbc2dn( Operation *op, SlapReply *rs, struct berval *dn );

/*
 * entry-id.c
 */
#ifdef BACKSQL_ARBITRARY_KEY
extern struct berval	backsql_baseObject_bv;
#endif /* BACKSQL_ARBITRARY_KEY */

/* stores in *id the ID in table ldap_entries corresponding to DN, if any */
extern int
backsql_dn2id( Operation *op, SlapReply *rs, SQLHDBC dbh,
		struct berval *ndn, backsql_entryID *id,
		int matched, int muck );

/* stores in *nchildren the count of children for an entry */
extern int
backsql_count_children( Operation *op, SQLHDBC dbh,
		struct berval *dn, unsigned long *nchildren );

/* returns LDAP_COMPARE_TRUE/LDAP_COMPARE_FALSE if the entry corresponding
 * to DN has/has not children */
extern int
backsql_has_children( Operation *op, SQLHDBC dbh, struct berval *dn );

/* free *id and return next in list */
extern backsql_entryID *
backsql_free_entryID( backsql_entryID *id, int freeit, void *ctx );

/* turn an ID into an entry */
extern int
backsql_id2entry( backsql_srch_info *bsi, backsql_entryID *id );

/* duplicate an entryID */
extern backsql_entryID *
backsql_entryID_dup( backsql_entryID *eid, void *ctx );

/*
 * operational.c
 */

Attribute *backsql_operational_entryUUID( backsql_info *bi, backsql_entryID *id );

Attribute *backsql_operational_entryCSN( Operation *op );

/*
 * schema-map.c
 */

int backsql_load_schema_map( backsql_info *si, SQLHDBC dbh );

backsql_oc_map_rec *backsql_oc2oc( backsql_info *si, ObjectClass *oc );

backsql_oc_map_rec *backsql_id2oc( backsql_info *si, unsigned long id );

backsql_oc_map_rec * backsql_name2oc( backsql_info *si,
		struct berval *oc_name );

backsql_at_map_rec *backsql_ad2at( backsql_oc_map_rec *objclass,
		AttributeDescription *ad );

int backsql_supad2at( backsql_oc_map_rec *objclass,
		AttributeDescription *supad, backsql_at_map_rec ***pret );

int backsql_destroy_schema_map( backsql_info *si );

/*
 * search.c
 */

int backsql_init_search( backsql_srch_info *bsi, 
		struct berval *nbase, int scope,
		time_t stoptime, Filter *filter, SQLHDBC dbh,
		Operation *op, SlapReply *rs, AttributeName *attrs,
		unsigned flags );

void backsql_entry_clean( Operation *op, Entry *e );

/*
 * sql-wrap.h
 */

RETCODE backsql_Prepare( SQLHDBC dbh, SQLHSTMT *sth, const char* query, int timeout );

#define backsql_BindParamStr( sth, par_ind, io, str, maxlen ) 		\
	SQLBindParameter( (sth), (SQLUSMALLINT)(par_ind), 		\
			(io), SQL_C_CHAR, SQL_VARCHAR,			\
         		(SQLULEN)(maxlen), 0, (SQLPOINTER)(str),	\
			(SQLLEN)(maxlen), NULL )

#define backsql_BindParamBerVal( sth, par_ind, io, bv ) 		\
	SQLBindParameter( (sth), (SQLUSMALLINT)(par_ind), 		\
			(io), SQL_C_CHAR, SQL_VARCHAR,			\
         		(SQLULEN)(bv)->bv_len, 0,			\
			(SQLPOINTER)(bv)->bv_val,			\
			(SQLLEN)(bv)->bv_len, NULL )

#define backsql_BindParamInt( sth, par_ind, io, val )			\
	SQLBindParameter( (sth), (SQLUSMALLINT)(par_ind),		\
			(io), SQL_C_ULONG, SQL_INTEGER,			\
			0, 0, (SQLPOINTER)(val), 0, (SQLLEN*)NULL )

#define backsql_BindParamNumID( sth, par_ind, io, val )			\
	SQLBindParameter( (sth), (SQLUSMALLINT)(par_ind),		\
			(io), BACKSQL_C_NUMID, SQL_INTEGER,		\
			0, 0, (SQLPOINTER)(val), 0, (SQLLEN*)NULL )

#ifdef BACKSQL_ARBITRARY_KEY
#define backsql_BindParamID( sth, par_ind, io, id )			\
	backsql_BindParamBerVal( (sth), (par_ind), (io), (id) )
#else /* ! BACKSQL_ARBITRARY_KEY */
#define backsql_BindParamID( sth, par_ind, io, id )			\
	backsql_BindParamNumID( (sth), (par_ind), (io), (id) )
#endif /* ! BACKSQL_ARBITRARY_KEY */

RETCODE backsql_BindRowAsStrings_x( SQLHSTMT sth, BACKSQL_ROW_NTS *row, void *ctx );

RETCODE backsql_BindRowAsStrings( SQLHSTMT sth, BACKSQL_ROW_NTS *row );

RETCODE backsql_FreeRow_x( BACKSQL_ROW_NTS *row, void *ctx );

RETCODE backsql_FreeRow( BACKSQL_ROW_NTS *row );

void backsql_PrintErrors( SQLHENV henv, SQLHDBC hdbc, SQLHSTMT sth, int rc );

int backsql_conn_destroy( backsql_info *bi );

int backsql_init_db_env( backsql_info *si );

int backsql_free_db_env( backsql_info *si );

int backsql_get_db_conn( Operation *op, SQLHDBC	*dbh );

int backsql_free_db_conn( Operation *op, SQLHDBC dbh );

/*
 * util.c
 */

extern const char 
	backsql_def_oc_query[],
	backsql_def_needs_select_oc_query[],
	backsql_def_at_query[],
	backsql_def_delentry_stmt[],
	backsql_def_renentry_stmt[],
	backsql_def_insentry_stmt[],
	backsql_def_delobjclasses_stmt[],
	backsql_def_subtree_cond[],
	backsql_def_upper_subtree_cond[],
	backsql_id_query[],
	backsql_def_concat_func[],
	backsql_check_dn_ru_query[];

struct berbuf * backsql_strcat_x( struct berbuf *dest, void *memctx, ... );
struct berbuf * backsql_strfcat_x( struct berbuf *dest, void *memctx, const char *fmt, ... );

int backsql_entry_addattr( Entry *e, AttributeDescription *ad, 
		struct berval *at_val, void *memctx );

int backsql_merge_from_clause( backsql_info *bi, struct berbuf *dest_from, 
		struct berval *src_from );

int backsql_split_pattern( const char *pattern, BerVarray *split_pattern,
		int expected );

int backsql_prepare_pattern( BerVarray split_pattern, BerVarray values,
		struct berval *res );

int backsql_entryUUID( backsql_info *bi, backsql_entryID *id,
		struct berval *entryUUID, void *memctx );
int backsql_entryUUID_decode( struct berval *entryUUID, unsigned long *oc_id,
#ifdef BACKSQL_ARBITRARY_KEY
	struct berval	*keyval
#else /* ! BACKSQL_ARBITRARY_KEY */
	unsigned long	*keyval
#endif /* ! BACKSQL_ARBITRARY_KEY */
	);

/*
 * former external.h
 */

extern BI_init			sql_back_initialize;

extern BI_destroy		backsql_destroy;

extern BI_db_init		backsql_db_init;
extern BI_db_open		backsql_db_open;
extern BI_db_close		backsql_db_close;
extern BI_db_destroy		backsql_db_destroy;
extern BI_db_config		backsql_db_config;

extern BI_op_bind		backsql_bind;
extern BI_op_search		backsql_search;
extern BI_op_compare		backsql_compare;
extern BI_op_modify		backsql_modify;
extern BI_op_modrdn		backsql_modrdn;
extern BI_op_add		backsql_add;
extern BI_op_delete		backsql_delete;

extern BI_operational		backsql_operational;
extern BI_entry_get_rw		backsql_entry_get;
extern BI_entry_release_rw	backsql_entry_release;

extern BI_connection_destroy	backsql_connection_destroy;

int backsql_init_cf( BackendInfo * bi );

#endif /* PROTO_SQL_H */