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   ldb database library

   Copyright (C) Andrew Tridgell    2004
   Copyright (C) Stefan Metzmacher  2004
   Copyright (C) Simo Sorce         2004-2005

     ** NOTE! The following LGPL license applies to the ldb
     ** library. This does NOT imply that all of Samba is released
     ** under the LGPL
   This library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 3 of the License, or (at your option) any later version.

   This library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with this library; if not, see <http://www.gnu.org/licenses/>.

 *  Name: ldb
 *  Component: ldb private header
 *  Description: defines internal ldb structures used by the subsystem and modules
 *  Author: Andrew Tridgell
 *  Author: Stefan Metzmacher

#ifndef _LDB_PRIVATE_H_
#define _LDB_PRIVATE_H_ 1

struct ldb_context;

struct ldb_module_ops;

/* basic module structure */
struct ldb_module {
      struct ldb_module *prev, *next;
      struct ldb_context *ldb;
      void *private_data;
      const struct ldb_module_ops *ops;

   these function pointers define the operations that a ldb module must perform
   they correspond exactly to the ldb_*() interface 
struct ldb_module_ops {
      const char *name;
      int (*init_context) (struct ldb_module *);
      int (*search)(struct ldb_module *, struct ldb_request *); /* search */
      int (*add)(struct ldb_module *, struct ldb_request *); /* add */
      int (*modify)(struct ldb_module *, struct ldb_request *); /* modify */
      int (*del)(struct ldb_module *, struct ldb_request *); /* delete */
      int (*rename)(struct ldb_module *, struct ldb_request *); /* rename */
      int (*request)(struct ldb_module *, struct ldb_request *); /* match any other operation */
      int (*extended)(struct ldb_module *, struct ldb_request *); /* extended operations */
      int (*start_transaction)(struct ldb_module *);
      int (*end_transaction)(struct ldb_module *);
      int (*del_transaction)(struct ldb_module *);
      int (*wait)(struct ldb_handle *, enum ldb_wait_type);
      int (*sequence_number)(struct ldb_module *, struct ldb_request *);

typedef int (*ldb_connect_fn) (struct ldb_context *ldb, const char *url, unsigned int flags, const char *options[],
                         struct ldb_module **module);

  schema related information needed for matching rules
struct ldb_schema {
      /* attribute handling table */
      unsigned num_attrib_handlers;
      struct ldb_attrib_handler *attrib_handlers;

      /* objectclass information */
      unsigned num_classes;
      struct ldb_subclass {
            char *name;
            char **subclasses;
      } *classes;

  every ldb connection is started by establishing a ldb_context
struct ldb_context {
      /* the operations provided by the backend */
      struct ldb_module *modules;

      /* debugging operations */
      struct ldb_debug_ops debug_ops;

      /* custom utf8 functions */
      struct ldb_utf8_fns utf8_fns;

      /* backend specific opaque parameters */
      struct ldb_opaque {
            struct ldb_opaque *next;
            const char *name;
            void *value;
      } *opaque;

      struct ldb_schema schema;

      char *err_string;

      int transaction_active;

      int default_timeout;

      unsigned int flags;

      unsigned int create_perms;

#ifndef ARRAY_SIZE
#define ARRAY_SIZE(a) (sizeof(a)/sizeof(a[0]))

  simplify out of memory handling
#define ldb_oom(ldb) ldb_debug_set(ldb, LDB_DEBUG_FATAL, "ldb out of memory at %s:%d\n", __FILE__, __LINE__)

/* The following definitions come from lib/ldb/common/ldb.c  */

int ldb_connect_backend(struct ldb_context *ldb, const char *url, const char *options[],
                  struct ldb_module **backend_module);

/* The following definitions come from lib/ldb/common/ldb_modules.c  */

const char **ldb_modules_list_from_string(struct ldb_context *ldb, TALLOC_CTX *mem_ctx, const char *string);
int ldb_load_modules_list(struct ldb_context *ldb, const char **module_list, struct ldb_module *backend, struct ldb_module **out);
int ldb_load_modules(struct ldb_context *ldb, const char *options[]);
int ldb_init_module_chain(struct ldb_context *ldb, struct ldb_module *module);
int ldb_next_request(struct ldb_module *module, struct ldb_request *request);
int ldb_next_start_trans(struct ldb_module *module);
int ldb_next_end_trans(struct ldb_module *module);
int ldb_next_del_trans(struct ldb_module *module);
int ldb_next_init(struct ldb_module *module);

void ldb_set_errstring(struct ldb_context *ldb, const char *err_string);
void ldb_asprintf_errstring(struct ldb_context *ldb, const char *format, ...) PRINTF_ATTRIBUTE(2,3);
void ldb_reset_err_string(struct ldb_context *ldb);

int ldb_register_module(const struct ldb_module_ops *);
int ldb_register_backend(const char *url_prefix, ldb_connect_fn);
int ldb_try_load_dso(struct ldb_context *ldb, const char *name);

/* The following definitions come from lib/ldb/common/ldb_debug.c  */
void ldb_debug(struct ldb_context *ldb, enum ldb_debug_level level, const char *fmt, ...) PRINTF_ATTRIBUTE(3, 4);
void ldb_debug_set(struct ldb_context *ldb, enum ldb_debug_level level, 
               const char *fmt, ...) PRINTF_ATTRIBUTE(3, 4);

/* The following definitions come from lib/ldb/common/ldb_ldif.c  */
int ldb_should_b64_encode(const struct ldb_val *val);

int ldb_objectclass_init(void);
int ldb_operational_init(void);
int ldb_paged_results_init(void);
int ldb_rdn_name_init(void);
int ldb_schema_init(void);
int ldb_asq_init(void);
int ldb_sort_init(void);
int ldb_ldap_init(void);
int ldb_ildap_init(void);
int ldb_tdb_init(void);
int ldb_sqlite3_init(void);

int ldb_match_msg(struct ldb_context *ldb,
              const struct ldb_message *msg,
              const struct ldb_parse_tree *tree,
              const struct ldb_dn *base,
              enum ldb_scope scope);

void ldb_remove_attrib_handler(struct ldb_context *ldb, const char *attrib);
const struct ldb_attrib_handler *ldb_attrib_handler_syntax(struct ldb_context *ldb,
                                             const char *syntax);
int ldb_set_attrib_handlers(struct ldb_context *ldb, 
                      const struct ldb_attrib_handler *handlers, 
                      unsigned num_handlers);
int ldb_setup_wellknown_attributes(struct ldb_context *ldb);
int ldb_set_attrib_handler_syntax(struct ldb_context *ldb, 
                          const char *attr, const char *syntax);

/* The following definitions come from lib/ldb/common/ldb_attributes.c  */
const char **ldb_subclass_list(struct ldb_context *ldb, const char *classname);
void ldb_subclass_remove(struct ldb_context *ldb, const char *classname);
int ldb_subclass_add(struct ldb_context *ldb, const char *classname, const char *subclass);

int ldb_handler_copy(struct ldb_context *ldb, void *mem_ctx,
                 const struct ldb_val *in, struct ldb_val *out);
int ldb_comparison_binary(struct ldb_context *ldb, void *mem_ctx,
                    const struct ldb_val *v1, const struct ldb_val *v2);

/* The following definitions come from lib/ldb/common/ldb_controls.c  */
struct ldb_control *get_control_from_list(struct ldb_control **controls, const char *oid);
int save_controls(struct ldb_control *exclude, struct ldb_request *req, struct ldb_control ***saver);
int check_critical_controls(struct ldb_control **controls);

/* The following definitions come from lib/ldb/common/ldb_utf8.c */
char *ldb_casefold_default(void *context, void *mem_ctx, const char *s);

void ldb_msg_remove_element(struct ldb_message *msg, struct ldb_message_element *el);

  Obtain current/next database sequence number
int ldb_sequence_number(struct ldb_context *ldb, enum ldb_sequence_type type, uint64_t *seq_num);



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