source/registry/reg_objects.c

   1 /*
   2  *  Unix SMB/CIFS implementation.
   3  *  Virtual Windows Registry Layer
   4  *  Copyright (C) Gerald Carter                     2002-2005
   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 frontend view functions. */
  21
  22 #include "includes.h"
  23
  24 #undef DBGC_CLASS
  25 #define DBGC_CLASS DBGC_REGISTRY
  26
  27 /**********************************************************************
  28
  29  Note that the REGSUB_CTR and REGVAL_CTR objects *must* be talloc()'d
  30  since the methods use the object pointer as the talloc context for
  31  internal private data.
  32
  33  There is no longer a regXXX_ctr_intit() and regXXX_ctr_destroy()
  34  pair of functions.  Simply TALLOC_ZERO_P() and TALLOC_FREE() the
  35  object.
  36
  37  **********************************************************************/
  38
  39 /***********************************************************************
  40  Add a new key to the array
  41  **********************************************************************/
  42
  43 WERROR regsubkey_ctr_addkey( REGSUBKEY_CTR *ctr, const char *keyname )
  44 {
  45         char **newkeys;
  46
  47         if ( !keyname ) {
  48                 return WERR_OK;
  49         }
  50
  51         /* make sure the keyname is not already there */
  52
  53         if ( regsubkey_ctr_key_exists( ctr, keyname ) ) {
  54                 return WERR_OK;
  55         }
  56
  57         if (!(newkeys = TALLOC_REALLOC_ARRAY(ctr, ctr->subkeys, char *,
  58                                              ctr->num_subkeys+1))) {
  59                 return WERR_NOMEM;
  60         }
  61
  62         ctr->subkeys = newkeys;
  63
  64         if (!(ctr->subkeys[ctr->num_subkeys] = talloc_strdup(ctr->subkeys,
  65                                                              keyname ))) {
  66                 /*
  67                  * Don't shrink the new array again, this wastes a pointer
  68                  */
  69                 return WERR_NOMEM;
  70         }
  71         ctr->num_subkeys++;
  72
  73         return WERR_OK;
  74 }
  75
  76  /***********************************************************************
  77  Delete a key from the array
  78  **********************************************************************/
  79
  80 int regsubkey_ctr_delkey( REGSUBKEY_CTR *ctr, const char *keyname )
  81 {
  82         int i;
  83
  84         if ( !keyname )
  85                 return ctr->num_subkeys;
  86
  87         /* make sure the keyname is actually already there */
  88
  89         for ( i=0; i<ctr->num_subkeys; i++ ) {
  90                 if ( strequal( ctr->subkeys[i], keyname ) )
  91                         break;
  92         }
  93
  94         if ( i == ctr->num_subkeys )
  95                 return ctr->num_subkeys;
  96
  97         /* update if we have any keys left */
  98         ctr->num_subkeys--;
  99         if ( i < ctr->num_subkeys )
 100                 memmove(&ctr->subkeys[i], &ctr->subkeys[i+1],
 101                         sizeof(char*) * (ctr->num_subkeys-i));
 102
 103         return ctr->num_subkeys;
 104 }
 105
 106 /***********************************************************************
 107  Check for the existance of a key
 108  **********************************************************************/
 109
 110 bool regsubkey_ctr_key_exists( REGSUBKEY_CTR *ctr, const char *keyname )
 111 {
 112         int     i;
 113
 114         if (!ctr->subkeys) {
 115                 return False;
 116         }
 117
 118         for ( i=0; i<ctr->num_subkeys; i++ ) {
 119                 if ( strequal( ctr->subkeys[i],keyname ) )
 120                         return True;
 121         }
 122
 123         return False;
 124 }
 125
 126 /***********************************************************************
 127  How many keys does the container hold ?
 128  **********************************************************************/
 129
 130 int regsubkey_ctr_numkeys( REGSUBKEY_CTR *ctr )
 131 {
 132         return ctr->num_subkeys;
 133 }
 134
 135 /***********************************************************************
 136  Retreive a specific key string
 137  **********************************************************************/
 138
 139 char* regsubkey_ctr_specific_key( REGSUBKEY_CTR *ctr, uint32 key_index )
 140 {
 141         if ( ! (key_index < ctr->num_subkeys) )
 142                 return NULL;
 143
 144         return ctr->subkeys[key_index];
 145 }
 146
 147 /*
 148  * Utility functions for REGVAL_CTR
 149  */
 150
 151 /***********************************************************************
 152  How many keys does the container hold ?
 153  **********************************************************************/
 154
 155 int regval_ctr_numvals( REGVAL_CTR *ctr )
 156 {
 157         return ctr->num_values;
 158 }
 159
 160 /***********************************************************************
 161  allocate memory for and duplicate a REGISTRY_VALUE.
 162  This is malloc'd memory so the caller should free it when done
 163  **********************************************************************/
 164
 165 REGISTRY_VALUE* dup_registry_value( REGISTRY_VALUE *val )
 166 {
 167         REGISTRY_VALUE  *copy = NULL;
 168
 169         if ( !val )
 170                 return NULL;
 171
 172         if ( !(copy = SMB_MALLOC_P( REGISTRY_VALUE)) ) {
 173                 DEBUG(0,("dup_registry_value: malloc() failed!\n"));
 174                 return NULL;
 175         }
 176
 177         /* copy all the non-pointer initial data */
 178
 179         memcpy( copy, val, sizeof(REGISTRY_VALUE) );
 180
 181         copy->size = 0;
 182         copy->data_p = NULL;
 183
 184         if ( val->data_p && val->size )
 185         {
 186                 if ( !(copy->data_p = (uint8 *)memdup( val->data_p,
 187                                                        val->size )) ) {
 188                         DEBUG(0,("dup_registry_value: memdup() failed for [%d] "
 189                                  "bytes!\n", val->size));
 190                         SAFE_FREE( copy );
 191                         return NULL;
 192                 }
 193                 copy->size = val->size;
 194         }
 195
 196         return copy;
 197 }
 198
 199 /**********************************************************************
 200  free the memory allocated to a REGISTRY_VALUE
 201  *********************************************************************/
 202
 203 void free_registry_value( REGISTRY_VALUE *val )
 204 {
 205         if ( !val )
 206                 return;
 207
 208         SAFE_FREE( val->data_p );
 209         SAFE_FREE( val );
 210
 211         return;
 212 }
 213
 214 /**********************************************************************
 215  *********************************************************************/
 216
 217 uint8* regval_data_p( REGISTRY_VALUE *val )
 218 {
 219         return val->data_p;
 220 }
 221
 222 /**********************************************************************
 223  *********************************************************************/
 224
 225 uint32 regval_size( REGISTRY_VALUE *val )
 226 {
 227         return val->size;
 228 }
 229
 230 /**********************************************************************
 231  *********************************************************************/
 232
 233 char* regval_name( REGISTRY_VALUE *val )
 234 {
 235         return val->valuename;
 236 }
 237
 238 /**********************************************************************
 239  *********************************************************************/
 240
 241 uint32 regval_type( REGISTRY_VALUE *val )
 242 {
 243         return val->type;
 244 }
 245
 246 /***********************************************************************
 247  Retreive a pointer to a specific value.  Caller shoud dup the structure
 248  since this memory will go away when the ctr is free()'d
 249  **********************************************************************/
 250
 251 REGISTRY_VALUE* regval_ctr_specific_value( REGVAL_CTR *ctr, uint32 idx )
 252 {
 253         if ( !(idx < ctr->num_values) )
 254                 return NULL;
 255
 256         return ctr->values[idx];
 257 }
 258
 259 /***********************************************************************
 260  Check for the existance of a value
 261  **********************************************************************/
 262
 263 bool regval_ctr_key_exists( REGVAL_CTR *ctr, const char *value )
 264 {
 265         int     i;
 266
 267         for ( i=0; i<ctr->num_values; i++ ) {
 268                 if ( strequal( ctr->values[i]->valuename, value) )
 269                         return True;
 270         }
 271
 272         return False;
 273 }
 274
 275 /***********************************************************************
 276  * compose a REGISTRY_VALUE from input data
 277  **********************************************************************/
 278
 279 REGISTRY_VALUE *regval_compose(TALLOC_CTX *ctx, const char *name, uint16 type,
 280                                const char *data_p, size_t size)
 281 {
 282         REGISTRY_VALUE *regval = TALLOC_P(ctx, REGISTRY_VALUE);
 283
 284         if (regval == NULL) {
 285                 return NULL;
 286         }
 287
 288         fstrcpy(regval->valuename, name);
 289         regval->type = type;
 290         if (size) {
 291                 regval->data_p = (uint8 *)TALLOC_MEMDUP(regval, data_p, size);
 292                 if (!regval->data_p) {
 293                         TALLOC_FREE(regval);
 294                         return NULL;
 295                 }
 296         } else {
 297                 regval->data_p = NULL;
 298         }
 299         regval->size = size;
 300
 301         return regval;
 302 }
 303
 304 /***********************************************************************
 305  Add a new registry value to the array
 306  **********************************************************************/
 307
 308 int regval_ctr_addvalue( REGVAL_CTR *ctr, const char *name, uint16 type,
 309                          const char *data_p, size_t size )
 310 {
 311         if ( !name )
 312                 return ctr->num_values;
 313
 314         /* Delete the current value (if it exists) and add the new one */
 315
 316         regval_ctr_delvalue( ctr, name );
 317
 318         /* allocate a slot in the array of pointers */
 319
 320         if (  ctr->num_values == 0 ) {
 321                 ctr->values = TALLOC_P( ctr, REGISTRY_VALUE *);
 322         } else {
 323                 ctr->values = TALLOC_REALLOC_ARRAY(ctr, ctr->values,
 324                                                    REGISTRY_VALUE *,
 325                                                    ctr->num_values+1);
 326         }
 327
 328         if (!ctr->values) {
 329                 ctr->num_values = 0;
 330                 return 0;
 331         }
 332
 333         /* allocate a new value and store the pointer in the arrya */
 334
 335         ctr->values[ctr->num_values] = regval_compose(ctr, name, type, data_p,
 336                                                       size);
 337         if (ctr->values[ctr->num_values] == NULL) {
 338                 ctr->num_values = 0;
 339                 return 0;
 340         }
 341         ctr->num_values++;
 342
 343         return ctr->num_values;
 344 }
 345
 346 /***********************************************************************
 347  Add a new registry value to the array
 348  **********************************************************************/
 349
 350 int regval_ctr_copyvalue( REGVAL_CTR *ctr, REGISTRY_VALUE *val )
 351 {
 352         if ( val ) {
 353                 regval_ctr_addvalue(ctr, val->valuename, val->type,
 354                                     (char *)val->data_p, val->size);
 355         }
 356
 357         return ctr->num_values;
 358 }
 359
 360 /***********************************************************************
 361  Delete a single value from the registry container.
 362  No need to free memory since it is talloc'd.
 363  **********************************************************************/
 364
 365 int regval_ctr_delvalue( REGVAL_CTR *ctr, const char *name )
 366 {
 367         int     i;
 368
 369         for ( i=0; i<ctr->num_values; i++ ) {
 370                 if ( strequal( ctr->values[i]->valuename, name ) )
 371                         break;
 372         }
 373
 374         /* just return if we don't find it */
 375
 376         if ( i == ctr->num_values )
 377                 return ctr->num_values;
 378
 379         /* If 'i' was not the last element, just shift everything down one */
 380         ctr->num_values--;
 381         if ( i < ctr->num_values )
 382                 memmove(&ctr->values[i], &ctr->values[i+1],
 383                         sizeof(REGISTRY_VALUE*)*(ctr->num_values-i));
 384
 385         return ctr->num_values;
 386 }
 387
 388 /***********************************************************************
 389  Retrieve single value from the registry container.
 390  No need to free memory since it is talloc'd.
 391  **********************************************************************/
 392
 393 REGISTRY_VALUE* regval_ctr_getvalue( REGVAL_CTR *ctr, const char *name )
 394 {
 395         int     i;
 396
 397         /* search for the value */
 398
 399         for ( i=0; i<ctr->num_values; i++ ) {
 400                 if ( strequal( ctr->values[i]->valuename, name ) )
 401                         return ctr->values[i];
 402         }
 403
 404         return NULL;
 405 }
 406
 407 /***********************************************************************
 408  return the data_p as a uint32
 409  **********************************************************************/
 410
 411 uint32 regval_dword( REGISTRY_VALUE *val )
 412 {
 413         uint32 data;
 414
 415         data = IVAL( regval_data_p(val), 0 );
 416
 417         return data;
 418 }
 419
 420 /***********************************************************************
 421  return the data_p as a character string
 422  **********************************************************************/
 423
 424 char *regval_sz(REGISTRY_VALUE *val)
 425 {
 426         char *data = NULL;
 427
 428         rpcstr_pull_talloc(talloc_tos(), &data,
 429                         regval_data_p(val), regval_size(val),0);
 430         return data;
 431 }