source3/lib/tdb_validate.h

   1 /*
   2  * Unix SMB/CIFS implementation.
   3  *
   4  * A general tdb content validation mechanism
   5  *
   6  * Copyright (C) Michael Adam      2007
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 3 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  20  */
  21
  22 #ifndef __TDB_VALIDATE_H__
  23 #define __TDB_VALIDATE_H__
  24
  25 #include "lib/replace/replace.h"
  26 #include "tdb_compat.h"
  27
  28 /**
  29  * Flag field for keeping track of the status of a validation.
  30  */
  31 struct tdb_validation_status {
  32         bool tdb_error;
  33         bool bad_freelist;
  34         bool bad_entry;
  35         bool unknown_key;
  36         bool success;
  37 };
  38
  39 /**
  40  * Callback function type for the validation mechanism.
  41  */
  42 typedef int (*tdb_validate_data_func)(TDB_CONTEXT *the_tdb, TDB_DATA kbuf,
  43                                       TDB_DATA dbuf, void *state);
  44
  45 /**
  46  * tdb validation function.
  47  * returns 0 if tdb is ok, != 0 if it isn't.
  48  * this function expects an opened tdb.
  49  */
  50 int tdb_validate(struct tdb_context *tdb,
  51                  tdb_validate_data_func validate_fn);
  52
  53 /**
  54  * tdb validation function.
  55  * returns 0 if tdb is ok, != 0 if it isn't.
  56  * This is a wrapper around the actual validation function that
  57  * opens and closes the tdb.
  58  */
  59 int tdb_validate_open(const char *tdb_path,
  60                       tdb_validate_data_func validate_fn);
  61
  62 /**
  63  * validation function with backup handling:
  64  *
  65  *  - calls tdb_validate
  66  *  - if the tdb is ok, create a backup "name.bak", possibly moving
  67  *    existing backup to name.bak.old,
  68  *    return 0 (success) even if the backup fails
  69  *  - if the tdb is corrupt:
  70  *    - move the tdb to "name.corrupt"
  71  *    - check if there is valid backup.
  72  *      if so, restore the backup.
  73  *      if restore is successful, return 0 (success),
  74  *    - otherwise return -1 (failure)
  75  */
  76 int tdb_validate_and_backup(const char *tdb_path,
  77                             tdb_validate_data_func validate_fn);
  78
  79 #endif /* __TDB_VALIDATE_H__ */