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
  31 static WERROR keyname_to_path(TALLOC_CTX *mem_ctx, const char *keyname,
  32                               char **path)
  33 {
  34         char *tmp_path = NULL;
  35
  36         if ((keyname == NULL) || (path == NULL)) {
  37                 return WERR_INVALID_PARAM;
  38         }
  39
  40         tmp_path = talloc_asprintf(mem_ctx, "\\%s", keyname);
  41         if (tmp_path == NULL) {
  42                 DEBUG(0, ("talloc_asprintf failed!\n"));
  43                 return WERR_NOMEM;
  44         }
  45
  46         tmp_path = talloc_string_sub(mem_ctx, tmp_path, "\\", "/");
  47         if (tmp_path == NULL) {
  48                 DEBUG(0, ("talloc_string_sub_failed!\n"));
  49                 return WERR_NOMEM;
  50         }
  51
  52         *path = tmp_path;
  53
  54         return WERR_OK;
  55 }
  56
  57 /**********************************************************************
  58  Initialize the cache tree if it has not been initialized yet.
  59  *********************************************************************/
  60
  61 WERROR reghook_cache_init(void)
  62 {
  63         if (cache_tree != NULL) {
  64                 return WERR_OK;
  65         }
  66
  67         cache_tree = pathtree_init(&regdb_ops, NULL);
  68         if (cache_tree == NULL) {
  69                 return WERR_NOMEM;
  70         }
  71         DEBUG(10, ("reghook_cache_init: new tree with default "
  72                    "ops %p for key [%s]\n", (void *)&regdb_ops,
  73                    KEY_TREE_ROOT));
  74         return WERR_OK;
  75 }
  76
  77 /**********************************************************************
  78  Add a new registry hook to the cache.  Note that the keyname
  79  is not in the exact format that a SORTED_TREE expects.
  80  *********************************************************************/
  81
  82 WERROR reghook_cache_add(const char *keyname, REGISTRY_OPS *ops)
  83 {
  84         WERROR werr;
  85         char *key = NULL;
  86
  87         if ((keyname == NULL) || (ops == NULL)) {
  88                 return WERR_INVALID_PARAM;
  89         }
  90
  91         werr = keyname_to_path(talloc_tos(), keyname, &key);
  92         if (!W_ERROR_IS_OK(werr)) {
  93                 goto done;
  94         }
  95
  96         DEBUG(10, ("reghook_cache_add: Adding ops %p for key [%s]\n",
  97                    (void *)ops, key));
  98
  99         werr = pathtree_add(cache_tree, key, ops);
 100
 101 done:
 102         TALLOC_FREE(key);
 103         return werr;
 104 }
 105
 106 /**********************************************************************
 107  Find a key in the cache.
 108  *********************************************************************/
 109
 110 REGISTRY_OPS *reghook_cache_find(const char *keyname)
 111 {
 112         WERROR werr;
 113         char *key = NULL;
 114         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 = (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 }