source/registry/reg_cachehook.c

   1 /*
   2  *  Unix SMB/CIFS implementation.
   3  *  Virtual Windows Registry Layer
   4  *  Copyright (C) Gerald Carter                     2002.
   5  *
   6  *  This program is free software; you can redistribute it and/or modify
   7  *  it under the terms of the GNU General Public License as published by
   8  *  the Free Software Foundation; either version 3 of the License, or
   9  *  (at your option) any later version.
  10  *
  11  *  This program is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *  GNU General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU General Public License
  17  *  along with this program; if not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 /* Implementation of registry hook cache tree */
  21
  22 #include "includes.h"
  23 #include "adt_tree.h"
  24
  25 #undef DBGC_CLASS
  26 #define DBGC_CLASS DBGC_REGISTRY
  27
  28 static SORTED_TREE *cache_tree = NULL;
  29 extern REGISTRY_OPS regdb_ops;          /* these are the default */
  30 static REGISTRY_HOOK default_hook = { KEY_TREE_ROOT, &regdb_ops };
  31
  32 /**********************************************************************
  33  Initialize the cache tree if it has not been initialized yet.
  34  *********************************************************************/
  35
  36 bool reghook_cache_init( void )
  37 {
  38         if (cache_tree == NULL) {
  39                 cache_tree = pathtree_init(&default_hook, NULL);
  40         }
  41
  42         return (cache_tree != NULL);
  43 }
  44
  45 /**********************************************************************
  46  Add a new REGISTRY_HOOK to the cache.  Note that the keyname
  47  is not in the exact format that a SORTED_TREE expects.
  48  *********************************************************************/
  49
  50 bool reghook_cache_add( REGISTRY_HOOK *hook )
  51 {
  52         TALLOC_CTX *ctx = talloc_tos();
  53         char *key = NULL;
  54
  55         if (!hook) {
  56                 return false;
  57         }
  58
  59         key = talloc_asprintf(ctx, "//%s", hook->keyname);
  60         if (!key) {
  61                 return false;
  62         }
  63         key = talloc_string_sub(ctx, key, "\\", "/");
  64         if (!key) {
  65                 return false;
  66         }
  67
  68         DEBUG(10,("reghook_cache_add: Adding key [%s]\n", key));
  69
  70         return pathtree_add( cache_tree, key, hook );
  71 }
  72
  73 /**********************************************************************
  74  Initialize the cache tree
  75  *********************************************************************/
  76
  77 REGISTRY_HOOK* reghook_cache_find( const char *keyname )
  78 {
  79         char *key;
  80         int len;
  81         REGISTRY_HOOK *hook;
  82
  83         if ( !keyname )
  84                 return NULL;
  85
  86         /* prepend the string with a '\' character */
  87
  88         len = strlen( keyname );
  89         if ( !(key = (char *)SMB_MALLOC( len + 2 )) ) {
  90                 DEBUG(0,("reghook_cache_find: malloc failed for string [%s] !?!?!\n",
  91                         keyname));
  92                 return NULL;
  93         }
  94
  95         *key = '\\';
  96         strncpy( key+1, keyname, len+1);
  97
  98         /* swap to a form understood by the SORTED_TREE */
  99
 100         string_sub( key, "\\", "/", 0 );
 101
 102         DEBUG(10,("reghook_cache_find: Searching for keyname [%s]\n", key));
 103
 104         hook = (REGISTRY_HOOK *)pathtree_find( cache_tree, key ) ;
 105
 106         SAFE_FREE( key );
 107
 108         return hook;
 109 }
 110
 111 /**********************************************************************
 112  Initialize the cache tree
 113  *********************************************************************/
 114
 115 void reghook_dump_cache( int debuglevel )
 116 {
 117         DEBUG(debuglevel,("reghook_dump_cache: Starting cache dump now...\n"));
 118
 119         pathtree_print_keys( cache_tree, debuglevel );
 120 }