source3/registry/reg_cachehook.c

   1 /*
   2  *  Unix SMB/CIFS implementation.
   3  *  Virtual Windows Registry Layer
   4  *  Copyright (C) Gerald Carter                     2002.
   5  *  Copyright (C) Michael Adam                      2008
   6  *
   7  *  This program is free software; you can redistribute it and/or modify
   8  *  it under the terms of the GNU General Public License as published by
   9  *  the Free Software Foundation; either version 3 of the License, or
  10  *  (at your option) any later version.
  11  *
  12  *  This program is distributed in the hope that it will be useful,
  13  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  *  GNU General Public License for more details.
  16  *
  17  *  You should have received a copy of the GNU General Public License
  18  *  along with this program; if not, see <http://www.gnu.org/licenses/>.
  19  */
  20
  21 /* Implementation of registry hook cache tree */
  22
  23 #include "includes.h"
  24 #include "adt_tree.h"
  25 #include "registry.h"
  26 #include "reg_cachehook.h"
  27
  28 #undef DBGC_CLASS
  29 #define DBGC_CLASS DBGC_REGISTRY
  30
  31 static struct sorted_tree *cache_tree = NULL;
  32 extern struct registry_ops regdb_ops;           /* these are the default */
  33
  34 static WERROR keyname_to_path(TALLOC_CTX *mem_ctx, const char *keyname,
  35                               char **path)
  36 {
  37         char *tmp_path = NULL;
  38
  39         if ((keyname == NULL) || (path == NULL)) {
  40                 return WERR_INVALID_PARAMETER;
  41         }
  42
  43         tmp_path = talloc_asprintf(mem_ctx, "\\%s", keyname);
  44         if (tmp_path == NULL) {
  45                 DEBUG(0, ("talloc_asprintf failed!\n"));
  46                 return WERR_NOT_ENOUGH_MEMORY;
  47         }
  48
  49         *path = tmp_path;
  50
  51         return WERR_OK;
  52 }
  53
  54 /**********************************************************************
  55  Initialize the cache tree if it has not been initialized yet.
  56  *********************************************************************/
  57
  58 WERROR reghook_cache_init(void)
  59 {
  60         if (cache_tree != NULL) {
  61                 return WERR_OK;
  62         }
  63
  64         cache_tree = pathtree_init(&regdb_ops);
  65         if (cache_tree == NULL) {
  66                 return WERR_NOT_ENOUGH_MEMORY;
  67         }
  68         DEBUG(10, ("reghook_cache_init: new tree with default "
  69                    "ops %p for key [%s]\n", (void *)&regdb_ops,
  70                    KEY_TREE_ROOT));
  71         return WERR_OK;
  72 }
  73
  74 /**********************************************************************
  75  Add a new registry hook to the cache.  Note that the keyname
  76  is not in the exact format that a struct sorted_tree expects.
  77  *********************************************************************/
  78
  79 WERROR reghook_cache_add(const char *keyname, struct registry_ops *ops)
  80 {
  81         WERROR werr;
  82         char *key = NULL;
  83
  84         if ((keyname == NULL) || (ops == NULL)) {
  85                 return WERR_INVALID_PARAMETER;
  86         }
  87
  88         werr = keyname_to_path(talloc_tos(), keyname, &key);
  89         if (!W_ERROR_IS_OK(werr)) {
  90                 goto done;
  91         }
  92
  93         DEBUG(10, ("reghook_cache_add: Adding ops %p for key [%s]\n",
  94                    (void *)ops, key));
  95
  96         if (!pathtree_add(cache_tree, key, ops))
  97                 werr = WERR_NOT_ENOUGH_MEMORY;
  98         else
  99                 werr = WERR_OK;
 100
 101 done:
 102         TALLOC_FREE(key);
 103         return werr;
 104 }
 105
 106 /**********************************************************************
 107  Find a key in the cache.
 108  *********************************************************************/
 109
 110 struct registry_ops *reghook_cache_find(const char *keyname)
 111 {
 112         WERROR werr;
 113         char *key = NULL;
 114         struct registry_ops *ops = NULL;
 115
 116         if (keyname == NULL) {
 117                 return NULL;
 118         }
 119
 120         werr = keyname_to_path(talloc_tos(), keyname, &key);
 121         if (!W_ERROR_IS_OK(werr)) {
 122                 goto done;
 123         }
 124
 125         DEBUG(10,("reghook_cache_find: Searching for keyname [%s]\n", key));
 126
 127         ops = (struct registry_ops *)pathtree_find(cache_tree, key);
 128
 129         DEBUG(10, ("reghook_cache_find: found ops %p for key [%s]\n",
 130                    ops ? (void *)ops : 0, key));
 131
 132 done:
 133         TALLOC_FREE(key);
 134
 135         return ops;
 136 }
 137
 138 /**********************************************************************
 139  Print out the cache tree structure for debugging.
 140  *********************************************************************/
 141
 142 void reghook_dump_cache( int debuglevel )
 143 {
 144         DEBUG(debuglevel,("reghook_dump_cache: Starting cache dump now...\n"));
 145
 146         pathtree_print_keys( cache_tree, debuglevel );
 147 }