source3/registry/regfio.c

   1 /*
   2  * Unix SMB/CIFS implementation.
   3  * Windows NT registry I/O library
   4  * Copyright (c) Gerald (Jerry) Carter               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 #include "includes.h"
  21 #include "regfio.h"
  22
  23 #undef DBGC_CLASS
  24 #define DBGC_CLASS DBGC_REGISTRY
  25
  26 /*******************************************************************
  27  *
  28  * TODO : Right now this code basically ignores classnames.
  29  *
  30  ******************************************************************/
  31
  32
  33 /*******************************************************************
  34 *******************************************************************/
  35
  36 static int write_block( REGF_FILE *file, prs_struct *ps, uint32 offset )
  37 {
  38         int bytes_written, returned;
  39         char *buffer = prs_data_p( ps );
  40         uint32 buffer_size = prs_data_size( ps );
  41         SMB_STRUCT_STAT sbuf;
  42
  43         if ( file->fd == -1 )
  44                 return -1;
  45
  46         /* check for end of file */
  47
  48         if ( sys_fstat( file->fd, &sbuf ) ) {
  49                 DEBUG(0,("write_block: stat() failed! (%s)\n", strerror(errno)));
  50                 return -1;
  51         }
  52
  53         if ( lseek( file->fd, offset, SEEK_SET ) == -1 ) {
  54                 DEBUG(0,("write_block: lseek() failed! (%s)\n", strerror(errno) ));
  55                 return -1;
  56         }
  57
  58         bytes_written = returned = 0;
  59         while ( bytes_written < buffer_size ) {
  60                 if ( (returned = write( file->fd, buffer+bytes_written, buffer_size-bytes_written )) == -1 ) {
  61                         DEBUG(0,("write_block: write() failed! (%s)\n", strerror(errno) ));
  62                         return False;
  63                 }
  64
  65                 bytes_written += returned;
  66         }
  67
  68         return bytes_written;
  69 }
  70
  71 /*******************************************************************
  72 *******************************************************************/
  73
  74 static int read_block( REGF_FILE *file, prs_struct *ps, uint32 file_offset, uint32 block_size )
  75 {
  76         int bytes_read, returned;
  77         char *buffer;
  78         SMB_STRUCT_STAT sbuf;
  79
  80         /* check for end of file */
  81
  82         if ( sys_fstat( file->fd, &sbuf ) ) {
  83                 DEBUG(0,("read_block: stat() failed! (%s)\n", strerror(errno)));
  84                 return -1;
  85         }
  86
  87         if ( (size_t)file_offset >= sbuf.st_size )
  88                 return -1;
  89
  90         /* if block_size == 0, we are parsing HBIN records and need
  91            to read some of the header to get the block_size from there */
  92
  93         if ( block_size == 0 ) {
  94                 char hdr[0x20];
  95
  96                 if ( lseek( file->fd, file_offset, SEEK_SET ) == -1 ) {
  97                         DEBUG(0,("read_block: lseek() failed! (%s)\n", strerror(errno) ));
  98                         return -1;
  99                 }
 100
 101                 returned = read( file->fd, hdr, 0x20 );
 102                 if ( (returned == -1) || (returned < 0x20) ) {
 103                         DEBUG(0,("read_block: failed to read in HBIN header. Is the file corrupt?\n"));
 104                         return -1;
 105                 }
 106
 107                 /* make sure this is an hbin header */
 108
 109                 if ( strncmp( hdr, "hbin", HBIN_HDR_SIZE ) != 0 ) {
 110                         DEBUG(0,("read_block: invalid block header!\n"));
 111                         return -1;
 112                 }
 113
 114                 block_size = IVAL( hdr, 0x08 );
 115         }
 116
 117         DEBUG(10,("read_block: block_size == 0x%x\n", block_size ));
 118
 119         /* set the offset, initialize the buffer, and read the block from disk */
 120
 121         if ( lseek( file->fd, file_offset, SEEK_SET ) == -1 ) {
 122                 DEBUG(0,("read_block: lseek() failed! (%s)\n", strerror(errno) ));
 123                 return -1;
 124         }
 125
 126         prs_init( ps, block_size, file->mem_ctx, UNMARSHALL );
 127         buffer = prs_data_p( ps );
 128         bytes_read = returned = 0;
 129
 130         while ( bytes_read < block_size ) {
 131                 if ( (returned = read( file->fd, buffer+bytes_read, block_size-bytes_read )) == -1 ) {
 132                         DEBUG(0,("read_block: read() failed (%s)\n", strerror(errno) ));
 133                         return False;
 134                 }
 135                 if ( (returned == 0) && (bytes_read < block_size) ) {
 136                         DEBUG(0,("read_block: not a vald registry file ?\n" ));
 137                         return False;
 138                 }
 139
 140                 bytes_read += returned;
 141         }
 142
 143         return bytes_read;
 144 }
 145
 146 /*******************************************************************
 147 *******************************************************************/
 148
 149 static bool write_hbin_block( REGF_FILE *file, REGF_HBIN *hbin )
 150 {
 151         if ( !hbin->dirty )
 152                 return True;
 153
 154         /* write free space record if any is available */
 155
 156         if ( hbin->free_off != REGF_OFFSET_NONE ) {
 157                 uint32 header = 0xffffffff;
 158
 159                 if ( !prs_set_offset( &hbin->ps, hbin->free_off-sizeof(uint32) ) )
 160                         return False;
 161                 if ( !prs_uint32( "free_size", &hbin->ps, 0, &hbin->free_size ) )
 162                         return False;
 163                 if ( !prs_uint32( "free_header", &hbin->ps, 0, &header ) )
 164                         return False;
 165         }
 166
 167         hbin->dirty = (write_block( file, &hbin->ps, hbin->file_off ) != -1);
 168
 169         return hbin->dirty;
 170 }
 171
 172 /*******************************************************************
 173 *******************************************************************/
 174
 175 static bool hbin_block_close( REGF_FILE *file, REGF_HBIN *hbin )
 176 {
 177         REGF_HBIN *p;
 178
 179         /* remove the block from the open list and flush it to disk */
 180
 181         for ( p=file->block_list; p && p!=hbin; p=p->next )
 182                 ;;
 183
 184         if ( p == hbin ) {
 185                 DLIST_REMOVE( file->block_list, hbin );
 186         }
 187         else
 188                 DEBUG(0,("hbin_block_close: block not in open list!\n"));
 189
 190         if ( !write_hbin_block( file, hbin ) )
 191                 return False;
 192
 193         return True;
 194 }
 195
 196 /*******************************************************************
 197 *******************************************************************/
 198
 199 static bool prs_regf_block( const char *desc, prs_struct *ps, int depth, REGF_FILE *file )
 200 {
 201         prs_debug(ps, depth, desc, "prs_regf_block");
 202         depth++;
 203
 204         if ( !prs_uint8s( True, "header", ps, depth, (uint8*)file->header, sizeof( file->header )) )
 205                 return False;
 206
 207         /* yes, these values are always identical so store them only once */
 208
 209         if ( !prs_uint32( "unknown1", ps, depth, &file->unknown1 ))
 210                 return False;
 211         if ( !prs_uint32( "unknown1 (again)", ps, depth, &file->unknown1 ))
 212                 return False;
 213
 214         /* get the modtime */
 215
 216         if ( !prs_set_offset( ps, 0x0c ) )
 217                 return False;
 218         if ( !smb_io_time( "modtime", &file->mtime, ps, depth ) )
 219                 return False;
 220
 221         /* constants */
 222
 223         if ( !prs_uint32( "unknown2", ps, depth, &file->unknown2 ))
 224                 return False;
 225         if ( !prs_uint32( "unknown3", ps, depth, &file->unknown3 ))
 226                 return False;
 227         if ( !prs_uint32( "unknown4", ps, depth, &file->unknown4 ))
 228                 return False;
 229         if ( !prs_uint32( "unknown5", ps, depth, &file->unknown5 ))
 230                 return False;
 231
 232         /* get file offsets */
 233
 234         if ( !prs_set_offset( ps, 0x24 ) )
 235                 return False;
 236         if ( !prs_uint32( "data_offset", ps, depth, &file->data_offset ))
 237                 return False;
 238         if ( !prs_uint32( "last_block", ps, depth, &file->last_block ))
 239                 return False;
 240
 241         /* one more constant */
 242
 243         if ( !prs_uint32( "unknown6", ps, depth, &file->unknown6 ))
 244                 return False;
 245
 246         /* get the checksum */
 247
 248         if ( !prs_set_offset( ps, 0x01fc ) )
 249                 return False;
 250         if ( !prs_uint32( "checksum", ps, depth, &file->checksum ))
 251                 return False;
 252
 253         return True;
 254 }
 255
 256 /*******************************************************************
 257 *******************************************************************/
 258
 259 static bool prs_hbin_block( const char *desc, prs_struct *ps, int depth, REGF_HBIN *hbin )
 260 {
 261         uint32 block_size2;
 262
 263         prs_debug(ps, depth, desc, "prs_regf_block");
 264         depth++;
 265
 266         if ( !prs_uint8s( True, "header", ps, depth, (uint8*)hbin->header, sizeof( hbin->header )) )
 267                 return False;
 268
 269         if ( !prs_uint32( "first_hbin_off", ps, depth, &hbin->first_hbin_off ))
 270                 return False;
 271
 272         /* The dosreg.cpp comments say that the block size is at 0x1c.
 273            According to a WINXP NTUSER.dat file, this is wrong.  The block_size
 274            is at 0x08 */
 275
 276         if ( !prs_uint32( "block_size", ps, depth, &hbin->block_size ))
 277                 return False;
 278
 279         block_size2 = hbin->block_size;
 280         prs_set_offset( ps, 0x1c );
 281         if ( !prs_uint32( "block_size2", ps, depth, &block_size2 ))
 282                 return False;
 283
 284         if ( MARSHALLING(ps) )
 285                 hbin->dirty = True;
 286
 287
 288         return True;
 289 }
 290
 291 /*******************************************************************
 292 *******************************************************************/
 293
 294 static bool prs_nk_rec( const char *desc, prs_struct *ps, int depth, REGF_NK_REC *nk )
 295 {
 296         uint16 class_length, name_length;
 297         uint32 start;
 298         uint32 data_size, start_off, end_off;
 299         uint32 unknown_off = REGF_OFFSET_NONE;
 300
 301         nk->hbin_off = prs_offset( ps );
 302         start = nk->hbin_off;
 303
 304         prs_debug(ps, depth, desc, "prs_nk_rec");
 305         depth++;
 306
 307         /* back up and get the data_size */
 308
 309         if ( !prs_set_offset( ps, prs_offset(ps)-sizeof(uint32)) )
 310                 return False;
 311         start_off = prs_offset( ps );
 312         if ( !prs_uint32( "rec_size", ps, depth, &nk->rec_size ))
 313                 return False;
 314
 315         if ( !prs_uint8s( True, "header", ps, depth, (uint8*)nk->header, sizeof( nk->header )) )
 316                 return False;
 317
 318         if ( !prs_uint16( "key_type", ps, depth, &nk->key_type ))
 319                 return False;
 320         if ( !smb_io_time( "mtime", &nk->mtime, ps, depth ))
 321                 return False;
 322
 323         if ( !prs_set_offset( ps, start+0x0010 ) )
 324                 return False;
 325         if ( !prs_uint32( "parent_off", ps, depth, &nk->parent_off ))
 326                 return False;
 327         if ( !prs_uint32( "num_subkeys", ps, depth, &nk->num_subkeys ))
 328                 return False;
 329
 330         if ( !prs_set_offset( ps, start+0x001c ) )
 331                 return False;
 332         if ( !prs_uint32( "subkeys_off", ps, depth, &nk->subkeys_off ))
 333                 return False;
 334         if ( !prs_uint32( "unknown_off", ps, depth, &unknown_off) )
 335                 return False;
 336
 337         if ( !prs_set_offset( ps, start+0x0024 ) )
 338                 return False;
 339         if ( !prs_uint32( "num_values", ps, depth, &nk->num_values ))
 340                 return False;
 341         if ( !prs_uint32( "values_off", ps, depth, &nk->values_off ))
 342                 return False;
 343         if ( !prs_uint32( "sk_off", ps, depth, &nk->sk_off ))
 344                 return False;
 345         if ( !prs_uint32( "classname_off", ps, depth, &nk->classname_off ))
 346                 return False;
 347
 348         if ( !prs_uint32( "max_bytes_subkeyname", ps, depth, &nk->max_bytes_subkeyname))
 349                 return False;
 350         if ( !prs_uint32( "max_bytes_subkeyclassname", ps, depth, &nk->max_bytes_subkeyclassname))
 351                 return False;
 352         if ( !prs_uint32( "max_bytes_valuename", ps, depth, &nk->max_bytes_valuename))
 353                 return False;
 354         if ( !prs_uint32( "max_bytes_value", ps, depth, &nk->max_bytes_value))
 355                 return False;
 356         if ( !prs_uint32( "unknown index", ps, depth, &nk->unk_index))
 357                 return False;
 358
 359         name_length = nk->keyname ? strlen(nk->keyname) : 0 ;
 360         class_length = nk->classname ? strlen(nk->classname) : 0 ;
 361         if ( !prs_uint16( "name_length", ps, depth, &name_length ))
 362                 return False;
 363         if ( !prs_uint16( "class_length", ps, depth, &class_length ))
 364                 return False;
 365
 366         if ( class_length ) {
 367                 ;;
 368         }
 369
 370         if ( name_length ) {
 371                 if ( UNMARSHALLING(ps) ) {
 372                         if ( !(nk->keyname = PRS_ALLOC_MEM( ps, char, name_length+1 )) )
 373                                 return False;
 374                 }
 375
 376                 if ( !prs_uint8s( True, "name", ps, depth, (uint8*)nk->keyname, name_length) )
 377                         return False;
 378
 379                 if ( UNMARSHALLING(ps) )
 380                         nk->keyname[name_length] = '\0';
 381         }
 382
 383         end_off = prs_offset( ps );
 384
 385         /* data_size must be divisible by 8 and large enough to hold the original record */
 386
 387         data_size = ((start_off - end_off) & 0xfffffff8 );
 388         if ( data_size > nk->rec_size )
 389                 DEBUG(10,("Encountered reused record (0x%x < 0x%x)\n", data_size, nk->rec_size));
 390
 391         if ( MARSHALLING(ps) )
 392                 nk->hbin->dirty = True;
 393
 394         return True;
 395 }
 396
 397 /*******************************************************************
 398 *******************************************************************/
 399
 400 static uint32 regf_block_checksum( prs_struct *ps )
 401 {
 402         char *buffer = prs_data_p( ps );
 403         uint32 checksum, x;
 404         int i;
 405
 406         /* XOR of all bytes 0x0000 - 0x01FB */
 407
 408         checksum = x = 0;
 409
 410         for ( i=0; i<0x01FB; i+=4 ) {
 411                 x = IVAL(buffer, i );
 412                 checksum ^= x;
 413         }
 414
 415         return checksum;
 416 }
 417
 418 /*******************************************************************
 419 *******************************************************************/
 420
 421 static bool read_regf_block( REGF_FILE *file )
 422 {
 423         prs_struct ps;
 424         uint32 checksum;
 425
 426         /* grab the first block from the file */
 427
 428         if ( read_block( file, &ps, 0, REGF_BLOCKSIZE ) == -1 )
 429                 return False;
 430
 431         /* parse the block and verify the checksum */
 432
 433         if ( !prs_regf_block( "regf_header", &ps, 0, file ) )
 434                 return False;
 435
 436         checksum = regf_block_checksum( &ps );
 437
 438         prs_mem_free( &ps );
 439
 440         if ( file->checksum !=  checksum ) {
 441                 DEBUG(0,("read_regf_block: invalid checksum\n" ));
 442                 return False;
 443         }
 444
 445         return True;
 446 }
 447
 448 /*******************************************************************
 449 *******************************************************************/
 450
 451 static REGF_HBIN* read_hbin_block( REGF_FILE *file, off_t offset )
 452 {
 453         REGF_HBIN *hbin;
 454         uint32 record_size, curr_off, block_size, header;
 455
 456         if ( !(hbin = TALLOC_ZERO_P(file->mem_ctx, REGF_HBIN)) )
 457                 return NULL;
 458         hbin->file_off = offset;
 459         hbin->free_off = -1;
 460
 461         if ( read_block( file, &hbin->ps, offset, 0 ) == -1 )
 462                 return NULL;
 463
 464         if ( !prs_hbin_block( "hbin", &hbin->ps, 0, hbin ) )
 465                 return NULL;
 466
 467         /* this should be the same thing as hbin->block_size but just in case */
 468
 469         block_size = prs_data_size( &hbin->ps );
 470
 471         /* Find the available free space offset.  Always at the end,
 472            so walk the record list and stop when you get to the end.
 473            The end is defined by a record header of 0xffffffff.  The
 474            previous 4 bytes contains the amount of free space remaining
 475            in the hbin block. */
 476
 477         /* remember that the record_size is in the 4 bytes preceeding the record itself */
 478
 479         if ( !prs_set_offset( &hbin->ps, file->data_offset+HBIN_HDR_SIZE-sizeof(uint32) ) )
 480                 return False;
 481
 482         record_size = 0;
 483         header = 0;
 484         curr_off = prs_offset( &hbin->ps );
 485         while ( header != 0xffffffff ) {
 486                 /* not done yet so reset the current offset to the
 487                    next record_size field */
 488
 489                 curr_off = curr_off+record_size;
 490
 491                 /* for some reason the record_size of the last record in
 492                    an hbin block can extend past the end of the block
 493                    even though the record fits within the remaining
 494                    space....aaarrrgggghhhhhh */
 495
 496                 if ( curr_off >= block_size ) {
 497                         record_size = -1;
 498                         curr_off = -1;
 499                         break;
 500                 }
 501
 502                 if ( !prs_set_offset( &hbin->ps, curr_off) )
 503                         return False;
 504
 505                 if ( !prs_uint32( "rec_size", &hbin->ps, 0, &record_size ) )
 506                         return False;
 507                 if ( !prs_uint32( "header", &hbin->ps, 0, &header ) )
 508                         return False;
 509
 510                 SMB_ASSERT( record_size != 0 );
 511
 512                 if ( record_size & 0x80000000 ) {
 513                         /* absolute_value(record_size) */
 514                         record_size = (record_size ^ 0xffffffff) + 1;
 515                 }
 516         }
 517
 518         /* save the free space offset */
 519
 520         if ( header == 0xffffffff ) {
 521
 522                 /* account for the fact that the curr_off is 4 bytes behind the actual
 523                    record header */
 524
 525                 hbin->free_off = curr_off + sizeof(uint32);
 526                 hbin->free_size = record_size;
 527         }
 528
 529         DEBUG(10,("read_hbin_block: free space offset == 0x%x\n", hbin->free_off));
 530
 531         if ( !prs_set_offset( &hbin->ps, file->data_offset+HBIN_HDR_SIZE )  )
 532                 return False;
 533
 534         return hbin;
 535 }
 536
 537 /*******************************************************************
 538  Input a random offset and receive the corresponding HBIN
 539  block for it
 540 *******************************************************************/
 541
 542 static bool hbin_contains_offset( REGF_HBIN *hbin, uint32 offset )
 543 {
 544         if ( !hbin )
 545                 return False;
 546
 547         if ( (offset > hbin->first_hbin_off) && (offset < (hbin->first_hbin_off+hbin->block_size)) )
 548                 return True;
 549
 550         return False;
 551 }
 552
 553 /*******************************************************************
 554  Input a random offset and receive the corresponding HBIN
 555  block for it
 556 *******************************************************************/
 557
 558 static REGF_HBIN* lookup_hbin_block( REGF_FILE *file, uint32 offset )
 559 {
 560         REGF_HBIN *hbin = NULL;
 561         uint32 block_off;
 562
 563         /* start with the open list */
 564
 565         for ( hbin=file->block_list; hbin; hbin=hbin->next ) {
 566                 DEBUG(10,("lookup_hbin_block: address = 0x%x [0x%lx]\n", hbin->file_off, (unsigned long)hbin ));
 567                 if ( hbin_contains_offset( hbin, offset ) )
 568                         return hbin;
 569         }
 570
 571         if ( !hbin ) {
 572                 /* start at the beginning */
 573
 574                 block_off = REGF_BLOCKSIZE;
 575                 do {
 576                         /* cleanup before the next round */
 577                         if ( hbin )
 578                                 prs_mem_free( &hbin->ps );
 579
 580                         hbin = read_hbin_block( file, block_off );
 581
 582                         if ( hbin )
 583                                 block_off = hbin->file_off + hbin->block_size;
 584
 585                 } while ( hbin && !hbin_contains_offset( hbin, offset ) );
 586         }
 587
 588         if ( hbin )
 589                 DLIST_ADD( file->block_list, hbin );
 590
 591         return hbin;
 592 }
 593
 594 /*******************************************************************
 595 *******************************************************************/
 596
 597 static bool prs_hash_rec( const char *desc, prs_struct *ps, int depth, REGF_HASH_REC *hash )
 598 {
 599         prs_debug(ps, depth, desc, "prs_hash_rec");
 600         depth++;
 601
 602         if ( !prs_uint32( "nk_off", ps, depth, &hash->nk_off ))
 603                 return False;
 604         if ( !prs_uint8s( True, "keycheck", ps, depth, hash->keycheck, sizeof( hash->keycheck )) )
 605                 return False;
 606
 607         return True;
 608 }
 609
 610 /*******************************************************************
 611 *******************************************************************/
 612
 613 static bool hbin_prs_lf_records( const char *desc, REGF_HBIN *hbin, int depth, REGF_NK_REC *nk )
 614 {
 615         int i;
 616         REGF_LF_REC *lf = &nk->subkeys;
 617         uint32 data_size, start_off, end_off;
 618
 619         prs_debug(&hbin->ps, depth, desc, "prs_lf_records");
 620         depth++;
 621
 622         /* check if we have anything to do first */
 623
 624         if ( nk->num_subkeys == 0 )
 625                 return True;
 626
 627         /* move to the LF record */
 628
 629         if ( !prs_set_offset( &hbin->ps, nk->subkeys_off + HBIN_HDR_SIZE - hbin->first_hbin_off ) )
 630                 return False;
 631
 632         /* backup and get the data_size */
 633
 634         if ( !prs_set_offset( &hbin->ps, prs_offset(&hbin->ps)-sizeof(uint32)) )
 635                 return False;
 636         start_off = prs_offset( &hbin->ps );
 637         if ( !prs_uint32( "rec_size", &hbin->ps, depth, &lf->rec_size ))
 638                 return False;
 639
 640         if ( !prs_uint8s( True, "header", &hbin->ps, depth, (uint8*)lf->header, sizeof( lf->header )) )
 641                 return False;
 642
 643         if ( !prs_uint16( "num_keys", &hbin->ps, depth, &lf->num_keys))
 644                 return False;
 645
 646         if ( UNMARSHALLING(&hbin->ps) ) {
 647                 if (lf->num_keys) {
 648                         if ( !(lf->hashes = PRS_ALLOC_MEM( &hbin->ps, REGF_HASH_REC, lf->num_keys )) )
 649                                 return False;
 650                 } else {
 651                         lf->hashes = NULL;
 652                 }
 653         }
 654
 655         for ( i=0; i<lf->num_keys; i++ ) {
 656                 if ( !prs_hash_rec( "hash_rec", &hbin->ps, depth, &lf->hashes[i] ) )
 657                         return False;
 658         }
 659
 660         end_off = prs_offset( &hbin->ps );
 661
 662         /* data_size must be divisible by 8 and large enough to hold the original record */
 663
 664         data_size = ((start_off - end_off) & 0xfffffff8 );
 665         if ( data_size > lf->rec_size )
 666                 DEBUG(10,("Encountered reused record (0x%x < 0x%x)\n", data_size, lf->rec_size));
 667
 668         if ( MARSHALLING(&hbin->ps) )
 669                 hbin->dirty = True;
 670
 671         return True;
 672 }
 673
 674 /*******************************************************************
 675 *******************************************************************/
 676
 677 static bool hbin_prs_sk_rec( const char *desc, REGF_HBIN *hbin, int depth, REGF_SK_REC *sk )
 678 {
 679         prs_struct *ps = &hbin->ps;
 680         uint16 tag = 0xFFFF;
 681         uint32 data_size, start_off, end_off;
 682
 683
 684         prs_debug(ps, depth, desc, "hbin_prs_sk_rec");
 685         depth++;
 686
 687         if ( !prs_set_offset( &hbin->ps, sk->sk_off + HBIN_HDR_SIZE - hbin->first_hbin_off ) )
 688                 return False;
 689
 690         /* backup and get the data_size */
 691
 692         if ( !prs_set_offset( &hbin->ps, prs_offset(&hbin->ps)-sizeof(uint32)) )
 693                 return False;
 694         start_off = prs_offset( &hbin->ps );
 695         if ( !prs_uint32( "rec_size", &hbin->ps, depth, &sk->rec_size ))
 696                 return False;
 697
 698         if ( !prs_uint8s( True, "header", ps, depth, (uint8*)sk->header, sizeof( sk->header )) )
 699                 return False;
 700         if ( !prs_uint16( "tag", ps, depth, &tag))
 701                 return False;
 702
 703         if ( !prs_uint32( "prev_sk_off", ps, depth, &sk->prev_sk_off))
 704                 return False;
 705         if ( !prs_uint32( "next_sk_off", ps, depth, &sk->next_sk_off))
 706                 return False;
 707         if ( !prs_uint32( "ref_count", ps, depth, &sk->ref_count))
 708                 return False;
 709         if ( !prs_uint32( "size", ps, depth, &sk->size))
 710                 return False;
 711
 712         if ( !sec_io_desc( "sec_desc", &sk->sec_desc, ps, depth ))
 713                 return False;
 714
 715         end_off = prs_offset( &hbin->ps );
 716
 717         /* data_size must be divisible by 8 and large enough to hold the original record */
 718
 719         data_size = ((start_off - end_off) & 0xfffffff8 );
 720         if ( data_size > sk->rec_size )
 721                 DEBUG(10,("Encountered reused record (0x%x < 0x%x)\n", data_size, sk->rec_size));
 722
 723         if ( MARSHALLING(&hbin->ps) )
 724                 hbin->dirty = True;
 725
 726         return True;
 727 }
 728
 729 /*******************************************************************
 730 *******************************************************************/
 731
 732 static bool hbin_prs_vk_rec( const char *desc, REGF_HBIN *hbin, int depth, REGF_VK_REC *vk, REGF_FILE *file )
 733 {
 734         uint32 offset;
 735         uint16 name_length;
 736         prs_struct *ps = &hbin->ps;
 737         uint32 data_size, start_off, end_off;
 738
 739         prs_debug(ps, depth, desc, "prs_vk_rec");
 740         depth++;
 741
 742         /* backup and get the data_size */
 743
 744         if ( !prs_set_offset( &hbin->ps, prs_offset(&hbin->ps)-sizeof(uint32)) )
 745                 return False;
 746         start_off = prs_offset( &hbin->ps );
 747         if ( !prs_uint32( "rec_size", &hbin->ps, depth, &vk->rec_size ))
 748                 return False;
 749
 750         if ( !prs_uint8s( True, "header", ps, depth, (uint8*)vk->header, sizeof( vk->header )) )
 751                 return False;
 752
 753         if ( MARSHALLING(&hbin->ps) )
 754                 name_length = strlen(vk->valuename);
 755
 756         if ( !prs_uint16( "name_length", ps, depth, &name_length ))
 757                 return False;
 758         if ( !prs_uint32( "data_size", ps, depth, &vk->data_size ))
 759                 return False;
 760         if ( !prs_uint32( "data_off", ps, depth, &vk->data_off ))
 761                 return False;
 762         if ( !prs_uint32( "type", ps, depth, &vk->type))
 763                 return False;
 764         if ( !prs_uint16( "flag", ps, depth, &vk->flag))
 765                 return False;
 766
 767         offset = prs_offset( ps );
 768         offset += 2;    /* skip 2 bytes */
 769         prs_set_offset( ps, offset );
 770
 771         /* get the name */
 772
 773         if ( vk->flag&VK_FLAG_NAME_PRESENT ) {
 774
 775                 if ( UNMARSHALLING(&hbin->ps) ) {
 776                         if ( !(vk->valuename = PRS_ALLOC_MEM( ps, char, name_length+1 )))
 777                                 return False;
 778                 }
 779                 if ( !prs_uint8s( True, "name", ps, depth, (uint8*)vk->valuename, name_length ) )
 780                         return False;
 781         }
 782
 783         end_off = prs_offset( &hbin->ps );
 784
 785         /* get the data if necessary */
 786
 787         if ( vk->data_size != 0 ) {
 788                 bool charmode = False;
 789
 790                 if ( (vk->type == REG_SZ) || (vk->type == REG_MULTI_SZ) )
 791                         charmode = True;
 792
 793                 /* the data is stored in the offset if the size <= 4 */
 794
 795                 if ( !(vk->data_size & VK_DATA_IN_OFFSET) ) {
 796                         REGF_HBIN *hblock = hbin;
 797                         uint32 data_rec_size;
 798
 799                         if ( UNMARSHALLING(&hbin->ps) ) {
 800                                 if ( !(vk->data = PRS_ALLOC_MEM( ps, uint8, vk->data_size) ) )
 801                                         return False;
 802                         }
 803
 804                         /* this data can be in another hbin */
 805                         if ( !hbin_contains_offset( hbin, vk->data_off ) ) {
 806                                 if ( !(hblock = lookup_hbin_block( file, vk->data_off )) )
 807                                         return False;
 808                         }
 809                         if ( !(prs_set_offset( &hblock->ps, (vk->data_off+HBIN_HDR_SIZE-hblock->first_hbin_off)-sizeof(uint32) )) )
 810                                 return False;
 811
 812                         if ( MARSHALLING(&hblock->ps) ) {
 813                                 data_rec_size = ( (vk->data_size+sizeof(uint32)) & 0xfffffff8 ) + 8;
 814                                 data_rec_size = ( data_rec_size - 1 ) ^ 0xFFFFFFFF;
 815                         }
 816                         if ( !prs_uint32( "data_rec_size", &hblock->ps, depth, &data_rec_size ))
 817                                 return False;
 818                         if ( !prs_uint8s( charmode, "data", &hblock->ps, depth, vk->data, vk->data_size) )
 819                                 return False;
 820
 821                         if ( MARSHALLING(&hblock->ps) )
 822                                 hblock->dirty = True;
 823                 }
 824                 else {
 825                         if ( !(vk->data = PRS_ALLOC_MEM( ps, uint8, 4 ) ) )
 826                                 return False;
 827                         SIVAL( vk->data, 0, vk->data_off );
 828                 }
 829
 830         }
 831
 832         /* data_size must be divisible by 8 and large enough to hold the original record */
 833
 834         data_size = ((start_off - end_off ) & 0xfffffff8 );
 835         if ( data_size !=  vk->rec_size )
 836                 DEBUG(10,("prs_vk_rec: data_size check failed (0x%x < 0x%x)\n", data_size, vk->rec_size));
 837
 838         if ( MARSHALLING(&hbin->ps) )
 839                 hbin->dirty = True;
 840
 841         return True;
 842 }
 843
 844 /*******************************************************************
 845  read a VK record which is contained in the HBIN block stored
 846  in the prs_struct *ps.
 847 *******************************************************************/
 848
 849 static bool hbin_prs_vk_records( const char *desc, REGF_HBIN *hbin, int depth, REGF_NK_REC *nk, REGF_FILE *file )
 850 {
 851         int i;
 852         uint32 record_size;
 853
 854         prs_debug(&hbin->ps, depth, desc, "prs_vk_records");
 855         depth++;
 856
 857         /* check if we have anything to do first */
 858
 859         if ( nk->num_values == 0 )
 860                 return True;
 861
 862         if ( UNMARSHALLING(&hbin->ps) ) {
 863                 if ( !(nk->values = PRS_ALLOC_MEM( &hbin->ps, REGF_VK_REC, nk->num_values ) ) )
 864                         return False;
 865         }
 866
 867         /* convert the offset to something relative to this HBIN block */
 868
 869         if ( !prs_set_offset( &hbin->ps, nk->values_off+HBIN_HDR_SIZE-hbin->first_hbin_off-sizeof(uint32)) )
 870                 return False;
 871
 872         if ( MARSHALLING( &hbin->ps) ) {
 873                 record_size = ( ( nk->num_values * sizeof(uint32) ) & 0xfffffff8 ) + 8;
 874                 record_size = (record_size - 1) ^ 0xFFFFFFFF;
 875         }
 876
 877         if ( !prs_uint32( "record_size", &hbin->ps, depth, &record_size ) )
 878                 return False;
 879
 880         for ( i=0; i<nk->num_values; i++ ) {
 881                 if ( !prs_uint32( "vk_off", &hbin->ps, depth, &nk->values[i].rec_off ) )
 882                         return False;
 883         }
 884
 885         for ( i=0; i<nk->num_values; i++ ) {
 886                 REGF_HBIN *sub_hbin = hbin;
 887                 uint32 new_offset;
 888
 889                 if ( !hbin_contains_offset( hbin, nk->values[i].rec_off ) ) {
 890                         sub_hbin = lookup_hbin_block( file, nk->values[i].rec_off );
 891                         if ( !sub_hbin ) {
 892                                 DEBUG(0,("hbin_prs_vk_records: Failed to find HBIN block containing offset [0x%x]\n",
 893                                         nk->values[i].hbin_off));
 894                                 return False;
 895                         }
 896                 }
 897
 898                 new_offset = nk->values[i].rec_off + HBIN_HDR_SIZE - sub_hbin->first_hbin_off;
 899                 if ( !prs_set_offset( &sub_hbin->ps, new_offset ) )
 900                         return False;
 901                 if ( !hbin_prs_vk_rec( "vk_rec", sub_hbin, depth, &nk->values[i], file ) )
 902                         return False;
 903         }
 904
 905         if ( MARSHALLING(&hbin->ps) )
 906                 hbin->dirty = True;
 907
 908
 909         return True;
 910 }
 911
 912
 913 /*******************************************************************
 914 *******************************************************************/
 915
 916 static REGF_SK_REC* find_sk_record_by_offset( REGF_FILE *file, uint32 offset )
 917 {
 918         REGF_SK_REC *p_sk;
 919
 920         for ( p_sk=file->sec_desc_list; p_sk; p_sk=p_sk->next ) {
 921                 if ( p_sk->sk_off == offset )
 922                         return p_sk;
 923         }
 924
 925         return NULL;
 926 }
 927
 928 /*******************************************************************
 929 *******************************************************************/
 930
 931 static REGF_SK_REC* find_sk_record_by_sec_desc( REGF_FILE *file, SEC_DESC *sd )
 932 {
 933         REGF_SK_REC *p;
 934
 935         for ( p=file->sec_desc_list; p; p=p->next ) {
 936                 if ( sec_desc_equal( p->sec_desc, sd ) )
 937                         return p;
 938         }
 939
 940         /* failure */
 941
 942         return NULL;
 943 }
 944
 945 /*******************************************************************
 946 *******************************************************************/
 947
 948 static bool hbin_prs_key( REGF_FILE *file, REGF_HBIN *hbin, REGF_NK_REC *nk )
 949 {
 950         int depth = 0;
 951         REGF_HBIN *sub_hbin;
 952
 953         prs_debug(&hbin->ps, depth, "", "fetch_key");
 954         depth++;
 955
 956         /* get the initial nk record */
 957
 958         if ( !prs_nk_rec( "nk_rec", &hbin->ps, depth, nk ))
 959                 return False;
 960
 961         /* fill in values */
 962
 963         if ( nk->num_values && (nk->values_off!=REGF_OFFSET_NONE) ) {
 964                 sub_hbin = hbin;
 965                 if ( !hbin_contains_offset( hbin, nk->values_off ) ) {
 966                         sub_hbin = lookup_hbin_block( file, nk->values_off );
 967                         if ( !sub_hbin ) {
 968                                 DEBUG(0,("hbin_prs_key: Failed to find HBIN block containing value_list_offset [0x%x]\n",
 969                                         nk->values_off));
 970                                 return False;
 971                         }
 972                 }
 973
 974                 if ( !hbin_prs_vk_records( "vk_rec", sub_hbin, depth, nk, file ))
 975                         return False;
 976         }
 977
 978         /* now get subkeys */
 979
 980         if ( nk->num_subkeys && (nk->subkeys_off!=REGF_OFFSET_NONE) ) {
 981                 sub_hbin = hbin;
 982                 if ( !hbin_contains_offset( hbin, nk->subkeys_off ) ) {
 983                         sub_hbin = lookup_hbin_block( file, nk->subkeys_off );
 984                         if ( !sub_hbin ) {
 985                                 DEBUG(0,("hbin_prs_key: Failed to find HBIN block containing subkey_offset [0x%x]\n",
 986                                         nk->subkeys_off));
 987                                 return False;
 988                         }
 989                 }
 990
 991                 if ( !hbin_prs_lf_records( "lf_rec", sub_hbin, depth, nk ))
 992                         return False;
 993         }
 994
 995         /* get the to the security descriptor.  First look if we have already parsed it */
 996
 997         if ( (nk->sk_off!=REGF_OFFSET_NONE) && !( nk->sec_desc = find_sk_record_by_offset( file, nk->sk_off )) ) {
 998
 999                 sub_hbin = hbin;
1000                 if ( !hbin_contains_offset( hbin, nk->sk_off ) ) {
1001                         sub_hbin = lookup_hbin_block( file, nk->sk_off );
1002                         if ( !sub_hbin ) {
1003                                 DEBUG(0,("hbin_prs_key: Failed to find HBIN block containing sk_offset [0x%x]\n",
1004                                         nk->subkeys_off));
1005                                 return False;
1006                         }
1007                 }
1008
1009                 if ( !(nk->sec_desc = TALLOC_ZERO_P( file->mem_ctx, REGF_SK_REC )) )
1010                         return False;
1011                 nk->sec_desc->sk_off = nk->sk_off;
1012                 if ( !hbin_prs_sk_rec( "sk_rec", sub_hbin, depth, nk->sec_desc ))
1013                         return False;
1014
1015                 /* add to the list of security descriptors (ref_count has been read from the files) */
1016
1017                 nk->sec_desc->sk_off = nk->sk_off;
1018                 DLIST_ADD( file->sec_desc_list, nk->sec_desc );
1019         }
1020
1021         return True;
1022 }
1023
1024 /*******************************************************************
1025 *******************************************************************/
1026
1027 static bool next_record( REGF_HBIN *hbin, const char *hdr, bool *eob )
1028 {
1029         uint8 header[REC_HDR_SIZE];
1030         uint32 record_size;
1031         uint32 curr_off, block_size;
1032         bool found = False;
1033         prs_struct *ps = &hbin->ps;
1034
1035         curr_off = prs_offset( ps );
1036         if ( curr_off == 0 )
1037                 prs_set_offset( ps, HBIN_HEADER_REC_SIZE );
1038
1039         /* assume that the current offset is at the record header
1040            and we need to backup to read the record size */
1041
1042         curr_off -= sizeof(uint32);
1043
1044         block_size = prs_data_size( ps );
1045         record_size = 0;
1046         memset( header, 0x0, sizeof(uint8)*REC_HDR_SIZE );
1047         while ( !found ) {
1048
1049                 curr_off = curr_off+record_size;
1050                 if ( curr_off >= block_size )
1051                         break;
1052
1053                 if ( !prs_set_offset( &hbin->ps, curr_off) )
1054                         return False;
1055
1056                 if ( !prs_uint32( "record_size", ps, 0, &record_size ) )
1057                         return False;
1058                 if ( !prs_uint8s( True, "header", ps, 0, header, REC_HDR_SIZE ) )
1059                         return False;
1060
1061                 if ( record_size & 0x80000000 ) {
1062                         /* absolute_value(record_size) */
1063                         record_size = (record_size ^ 0xffffffff) + 1;
1064                 }
1065
1066                 if ( memcmp( header, hdr, REC_HDR_SIZE ) == 0 ) {
1067                         found = True;
1068                         curr_off += sizeof(uint32);
1069                 }
1070         }
1071
1072         /* mark prs_struct as done ( at end ) if no more SK records */
1073         /* mark end-of-block as True */
1074
1075         if ( !found ) {
1076                 prs_set_offset( &hbin->ps, prs_data_size(&hbin->ps) );
1077                 *eob = True;
1078                 return False;
1079         }
1080
1081         if ( !prs_set_offset( ps, curr_off ) )
1082                 return False;
1083
1084         return True;
1085 }
1086
1087 /*******************************************************************
1088 *******************************************************************/
1089
1090 static bool next_nk_record( REGF_FILE *file, REGF_HBIN *hbin, REGF_NK_REC *nk, bool *eob )
1091 {
1092         if ( next_record( hbin, "nk", eob ) && hbin_prs_key( file, hbin, nk ) )
1093                 return True;
1094
1095         return False;
1096 }
1097
1098 /*******************************************************************
1099  Intialize the newly created REGF_BLOCK in *file and write the
1100  block header to disk
1101 *******************************************************************/
1102
1103 static bool init_regf_block( REGF_FILE *file )
1104 {
1105         prs_struct ps;
1106         bool result = True;
1107
1108         if ( !prs_init( &ps, REGF_BLOCKSIZE, file->mem_ctx, MARSHALL ) )
1109                 return False;
1110
1111         memcpy( file->header, "regf", REGF_HDR_SIZE );
1112         file->data_offset = 0x20;
1113         file->last_block  = 0x1000;
1114
1115         /* set mod time */
1116
1117         unix_to_nt_time( &file->mtime, time(NULL) );
1118
1119         /* hard coded values...no diea what these are ... maybe in time */
1120
1121         file->unknown1 = 0x2;
1122         file->unknown2 = 0x1;
1123         file->unknown3 = 0x3;
1124         file->unknown4 = 0x0;
1125         file->unknown5 = 0x1;
1126         file->unknown6 = 0x1;
1127
1128         /* write header to the buffer */
1129
1130         if ( !prs_regf_block( "regf_header", &ps, 0, file ) ) {
1131                 result = False;
1132                 goto out;
1133         }
1134
1135         /* calculate the checksum, re-marshall data (to include the checksum)
1136            and write to disk */
1137
1138         file->checksum = regf_block_checksum( &ps );
1139         prs_set_offset( &ps, 0 );
1140         if ( !prs_regf_block( "regf_header", &ps, 0, file ) ) {
1141                 result = False;
1142                 goto out;
1143         }
1144
1145         if ( write_block( file, &ps, 0 ) == -1 ) {
1146                 DEBUG(0,("init_regf_block: Failed to initialize registry header block!\n"));
1147                 result = False;
1148                 goto out;
1149         }
1150
1151 out:
1152         prs_mem_free( &ps );
1153
1154         return result;
1155 }
1156 /*******************************************************************
1157  Open the registry file and then read in the REGF block to get the
1158  first hbin offset.
1159 *******************************************************************/
1160
1161  REGF_FILE* regfio_open( const char *filename, int flags, int mode )
1162 {
1163         REGF_FILE *rb;
1164
1165         if ( !(rb = SMB_MALLOC_P(REGF_FILE)) ) {
1166                 DEBUG(0,("ERROR allocating memory\n"));
1167                 return NULL;
1168         }
1169         ZERO_STRUCTP( rb );
1170         rb->fd = -1;
1171
1172         if ( !(rb->mem_ctx = talloc_init( "read_regf_block" )) ) {
1173                 regfio_close( rb );
1174                 return NULL;
1175         }
1176
1177         rb->open_flags = flags;
1178
1179         /* open and existing file */
1180
1181         if ( (rb->fd = open(filename, flags, mode)) == -1 ) {
1182                 DEBUG(0,("regfio_open: failure to open %s (%s)\n", filename, strerror(errno)));
1183                 regfio_close( rb );
1184                 return NULL;
1185         }
1186
1187         /* check if we are creating a new file or overwriting an existing one */
1188
1189         if ( flags & (O_CREAT|O_TRUNC) ) {
1190                 if ( !init_regf_block( rb ) ) {
1191                         DEBUG(0,("regfio_open: Failed to read initial REGF block\n"));
1192                         regfio_close( rb );
1193                         return NULL;
1194                 }
1195
1196                 /* success */
1197                 return rb;
1198         }
1199
1200         /* read in an existing file */
1201
1202         if ( !read_regf_block( rb ) ) {
1203                 DEBUG(0,("regfio_open: Failed to read initial REGF block\n"));
1204                 regfio_close( rb );
1205                 return NULL;
1206         }
1207
1208         /* success */
1209
1210         return rb;
1211 }
1212
1213 /*******************************************************************
1214 *******************************************************************/
1215
1216 static void regfio_mem_free( REGF_FILE *file )
1217 {
1218         /* free any talloc()'d memory */
1219
1220         if ( file && file->mem_ctx )
1221                 talloc_destroy( file->mem_ctx );
1222 }
1223
1224 /*******************************************************************
1225 *******************************************************************/
1226
1227  int regfio_close( REGF_FILE *file )
1228 {
1229         int fd;
1230
1231         /* cleanup for a file opened for write */
1232
1233         if ((file->fd != -1) && (file->open_flags & (O_WRONLY|O_RDWR))) {
1234                 prs_struct ps;
1235                 REGF_SK_REC *sk;
1236
1237                 /* write of sd list */
1238
1239                 for ( sk=file->sec_desc_list; sk; sk=sk->next ) {
1240                         hbin_prs_sk_rec( "sk_rec", sk->hbin, 0, sk );
1241                 }
1242
1243                 /* flush any dirty blocks */
1244
1245                 while ( file->block_list ) {
1246                         hbin_block_close( file, file->block_list );
1247                 }
1248
1249                 ZERO_STRUCT( ps );
1250
1251                 unix_to_nt_time( &file->mtime, time(NULL) );
1252
1253                 if ( read_block( file, &ps, 0, REGF_BLOCKSIZE ) != -1 ) {
1254                         /* now use for writing */
1255                         prs_switch_type( &ps, MARSHALL );
1256
1257                         /* stream the block once, generate the checksum,
1258                            and stream it again */
1259                         prs_set_offset( &ps, 0 );
1260                         prs_regf_block( "regf_blocK", &ps, 0, file );
1261                         file->checksum = regf_block_checksum( &ps );
1262                         prs_set_offset( &ps, 0 );
1263                         prs_regf_block( "regf_blocK", &ps, 0, file );
1264
1265                         /* now we are ready to write it to disk */
1266                         if ( write_block( file, &ps, 0 ) == -1 )
1267                                 DEBUG(0,("regfio_close: failed to update the regf header block!\n"));
1268                 }
1269
1270                 prs_mem_free( &ps );
1271         }
1272
1273         regfio_mem_free( file );
1274
1275         /* nothing tdo do if there is no open file */
1276
1277         if ( !file || (file->fd == -1) )
1278                 return 0;
1279
1280         fd = file->fd;
1281         file->fd = -1;
1282         SAFE_FREE( file );
1283
1284         return close( fd );
1285 }
1286
1287 /*******************************************************************
1288 *******************************************************************/
1289
1290 static void regfio_flush( REGF_FILE *file )
1291 {
1292         REGF_HBIN *hbin;
1293
1294         for ( hbin=file->block_list; hbin; hbin=hbin->next ) {
1295                 write_hbin_block( file, hbin );
1296         }
1297 }
1298
1299 /*******************************************************************
1300  There should be only *one* root key in the registry file based
1301  on my experience.  --jerry
1302 *******************************************************************/
1303
1304 REGF_NK_REC* regfio_rootkey( REGF_FILE *file )
1305 {
1306         REGF_NK_REC *nk;
1307         REGF_HBIN   *hbin;
1308         uint32      offset = REGF_BLOCKSIZE;
1309         bool        found = False;
1310         bool        eob;
1311
1312         if ( !file )
1313                 return NULL;
1314
1315         if ( !(nk = TALLOC_ZERO_P( file->mem_ctx, REGF_NK_REC )) ) {
1316                 DEBUG(0,("regfio_rootkey: talloc() failed!\n"));
1317                 return NULL;
1318         }
1319
1320         /* scan through the file on HBIN block at a time looking
1321            for an NK record with a type == 0x002c.
1322            Normally this is the first nk record in the first hbin
1323            block (but I'm not assuming that for now) */
1324
1325         while ( (hbin = read_hbin_block( file, offset )) ) {
1326                 eob = False;
1327
1328                 while ( !eob) {
1329                         if ( next_nk_record( file, hbin, nk, &eob ) ) {
1330                                 if ( nk->key_type == NK_TYPE_ROOTKEY ) {
1331                                         found = True;
1332                                         break;
1333                                 }
1334                         }
1335                         prs_mem_free( &hbin->ps );
1336                 }
1337
1338                 if ( found )
1339                         break;
1340
1341                 offset += hbin->block_size;
1342         }
1343
1344         if ( !found ) {
1345                 DEBUG(0,("regfio_rootkey: corrupt registry file ?  No root key record located\n"));
1346                 return NULL;
1347         }
1348
1349         DLIST_ADD( file->block_list, hbin );
1350
1351         return nk;
1352 }
1353
1354 /*******************************************************************
1355  This acts as an interator over the subkeys defined for a given
1356  NK record.  Remember that offsets are from the *first* HBIN block.
1357 *******************************************************************/
1358
1359  REGF_NK_REC* regfio_fetch_subkey( REGF_FILE *file, REGF_NK_REC *nk )
1360 {
1361         REGF_NK_REC *subkey;
1362         REGF_HBIN   *hbin;
1363         uint32      nk_offset;
1364
1365         /* see if there is anything left to report */
1366
1367         if ( !nk || (nk->subkeys_off==REGF_OFFSET_NONE) || (nk->subkey_index >= nk->num_subkeys) )
1368                 return NULL;
1369
1370         /* find the HBIN block which should contain the nk record */
1371
1372         if ( !(hbin = lookup_hbin_block( file, nk->subkeys.hashes[nk->subkey_index].nk_off )) ) {
1373                 DEBUG(0,("hbin_prs_key: Failed to find HBIN block containing offset [0x%x]\n",
1374                         nk->subkeys.hashes[nk->subkey_index].nk_off));
1375                 return NULL;
1376         }
1377
1378         nk_offset = nk->subkeys.hashes[nk->subkey_index].nk_off;
1379         if ( !prs_set_offset( &hbin->ps, (HBIN_HDR_SIZE + nk_offset - hbin->first_hbin_off) ) )
1380                 return NULL;
1381
1382         nk->subkey_index++;
1383         if ( !(subkey = TALLOC_ZERO_P( file->mem_ctx, REGF_NK_REC )) )
1384                 return NULL;
1385
1386         if ( !hbin_prs_key( file, hbin, subkey ) )
1387                 return NULL;
1388
1389         return subkey;
1390 }
1391
1392
1393 /*******************************************************************
1394 *******************************************************************/
1395
1396 static REGF_HBIN* regf_hbin_allocate( REGF_FILE *file, uint32 block_size )
1397 {
1398         REGF_HBIN *hbin;
1399         SMB_STRUCT_STAT sbuf;
1400
1401         if ( !(hbin = TALLOC_ZERO_P( file->mem_ctx, REGF_HBIN )) )
1402                 return NULL;
1403
1404         memcpy( hbin->header, "hbin", sizeof(HBIN_HDR_SIZE) );
1405
1406
1407         if ( sys_fstat( file->fd, &sbuf ) ) {
1408                 DEBUG(0,("regf_hbin_allocate: stat() failed! (%s)\n", strerror(errno)));
1409                 return NULL;
1410         }
1411
1412         hbin->file_off       = sbuf.st_size;
1413
1414         hbin->free_off       = HBIN_HEADER_REC_SIZE;
1415         hbin->free_size      = block_size - hbin->free_off + sizeof(uint32);;
1416
1417         hbin->block_size     = block_size;
1418         hbin->first_hbin_off = hbin->file_off - REGF_BLOCKSIZE;
1419
1420         if ( !prs_init( &hbin->ps, block_size, file->mem_ctx, MARSHALL ) )
1421                 return NULL;
1422
1423         if ( !prs_hbin_block( "new_hbin", &hbin->ps, 0, hbin ) )
1424                 return NULL;
1425
1426         if ( !write_hbin_block( file, hbin ) )
1427                 return NULL;
1428
1429         file->last_block = hbin->file_off;
1430
1431         return hbin;
1432 }
1433
1434 /*******************************************************************
1435 *******************************************************************/
1436
1437 static void update_free_space( REGF_HBIN *hbin, uint32 size_used )
1438 {
1439         hbin->free_off  += size_used;
1440         hbin->free_size -= size_used;
1441
1442         if ( hbin->free_off >= hbin->block_size ) {
1443                 hbin->free_off = REGF_OFFSET_NONE;
1444         }
1445
1446         return;
1447 }
1448
1449 /*******************************************************************
1450 *******************************************************************/
1451
1452 static REGF_HBIN* find_free_space( REGF_FILE *file, uint32 size )
1453 {
1454         REGF_HBIN *hbin, *p_hbin;
1455         uint32 block_off;
1456         bool cached;
1457
1458         /* check open block list */
1459
1460         for ( hbin=file->block_list; hbin!=NULL; hbin=hbin->next ) {
1461                 /* only check blocks that actually have available space */
1462
1463                 if ( hbin->free_off == REGF_OFFSET_NONE )
1464                         continue;
1465
1466                 /* check for a large enough available chunk */
1467
1468                 if ( (hbin->block_size - hbin->free_off) >= size ) {
1469                         DLIST_PROMOTE( file->block_list, hbin );
1470                         goto done;
1471                 }
1472         }
1473
1474         /* parse the file until we find a block with
1475            enough free space; save the last non-filled hbin */
1476
1477         block_off = REGF_BLOCKSIZE;
1478         do {
1479                 /* cleanup before the next round */
1480                 cached = False;
1481                 if ( hbin )
1482                         prs_mem_free( &hbin->ps );
1483
1484                 hbin = read_hbin_block( file, block_off );
1485
1486                 if ( hbin ) {
1487
1488                         /* make sure that we don't already have this block in memory */
1489
1490                         for ( p_hbin=file->block_list; p_hbin!=NULL; p_hbin=p_hbin->next ) {
1491                                 if ( p_hbin->file_off == hbin->file_off ) {
1492                                         cached = True;
1493                                         break;
1494                                 }
1495                         }
1496
1497                         block_off = hbin->file_off + hbin->block_size;
1498
1499                         if ( cached ) {
1500                                 prs_mem_free( &hbin->ps );
1501                                 hbin = NULL;
1502                                 continue;
1503                         }
1504                 }
1505         /* if (cached block or (new block and not enough free space)) then continue looping */
1506         } while ( cached || (hbin && (hbin->free_size < size)) );
1507
1508         /* no free space; allocate a new one */
1509
1510         if ( !hbin ) {
1511                 uint32 alloc_size;
1512
1513                 /* allocate in multiples of REGF_ALLOC_BLOCK; make sure (size + hbin_header) fits */
1514
1515                 alloc_size = (((size+HBIN_HEADER_REC_SIZE) / REGF_ALLOC_BLOCK ) + 1 ) * REGF_ALLOC_BLOCK;
1516
1517                 if ( !(hbin = regf_hbin_allocate( file, alloc_size )) ) {
1518                         DEBUG(0,("find_free_space: regf_hbin_allocate() failed!\n"));
1519                         return NULL;
1520                 }
1521                 DLIST_ADD( file->block_list, hbin );
1522         }
1523
1524 done:
1525         /* set the offset to be ready to write */
1526
1527         if ( !prs_set_offset( &hbin->ps, hbin->free_off-sizeof(uint32) ) )
1528                 return NULL;
1529
1530         /* write the record size as a placeholder for now, it should be
1531            probably updated by the caller once it all of the data necessary
1532            for the record */
1533
1534         if ( !prs_uint32("allocated_size", &hbin->ps, 0, &size) )
1535                 return False;
1536
1537         update_free_space( hbin, size );
1538
1539         return hbin;
1540 }
1541
1542 /*******************************************************************
1543 *******************************************************************/
1544
1545 static uint32 sk_record_data_size( SEC_DESC * sd )
1546 {
1547         uint32 size, size_mod8;
1548
1549         size_mod8 = 0;
1550
1551         /* the record size is sizeof(hdr) + name + static members + data_size_field */
1552
1553         size = sizeof(uint32)*5 + ndr_size_security_descriptor(sd, 0) + sizeof(uint32);
1554
1555         /* multiple of 8 */
1556         size_mod8 = size & 0xfffffff8;
1557         if ( size_mod8 < size )
1558                 size_mod8 += 8;
1559
1560         return size_mod8;
1561 }
1562
1563 /*******************************************************************
1564 *******************************************************************/
1565
1566 static uint32 vk_record_data_size( REGF_VK_REC *vk )
1567 {
1568         uint32 size, size_mod8;
1569
1570         size_mod8 = 0;
1571
1572         /* the record size is sizeof(hdr) + name + static members + data_size_field */
1573
1574         size = REC_HDR_SIZE + (sizeof(uint16)*3) + (sizeof(uint32)*3) + sizeof(uint32);
1575
1576         if ( vk->valuename )
1577                 size += strlen(vk->valuename);
1578
1579         /* multiple of 8 */
1580         size_mod8 = size & 0xfffffff8;
1581         if ( size_mod8 < size )
1582                 size_mod8 += 8;
1583
1584         return size_mod8;
1585 }
1586
1587 /*******************************************************************
1588 *******************************************************************/
1589
1590 static uint32 lf_record_data_size( uint32 num_keys )
1591 {
1592         uint32 size, size_mod8;
1593
1594         size_mod8 = 0;
1595
1596         /* the record size is sizeof(hdr) + num_keys + sizeof of hash_array + data_size_uint32 */
1597
1598         size = REC_HDR_SIZE + sizeof(uint16) + (sizeof(REGF_HASH_REC) * num_keys) + sizeof(uint32);
1599
1600         /* multiple of 8 */
1601         size_mod8 = size & 0xfffffff8;
1602         if ( size_mod8 < size )
1603                 size_mod8 += 8;
1604
1605         return size_mod8;
1606 }
1607
1608 /*******************************************************************
1609 *******************************************************************/
1610
1611 static uint32 nk_record_data_size( REGF_NK_REC *nk )
1612 {
1613         uint32 size, size_mod8;
1614
1615         size_mod8 = 0;
1616
1617         /* the record size is static + length_of_keyname + length_of_classname + data_size_uint32 */
1618
1619         size = 0x4c + strlen(nk->keyname) + sizeof(uint32);
1620
1621         if ( nk->classname )
1622                 size += strlen( nk->classname );
1623
1624         /* multiple of 8 */
1625         size_mod8 = size & 0xfffffff8;
1626         if ( size_mod8 < size )
1627                 size_mod8 += 8;
1628
1629         return size_mod8;
1630 }
1631
1632 /*******************************************************************
1633 *******************************************************************/
1634
1635 static bool create_vk_record( REGF_FILE *file, REGF_VK_REC *vk, REGISTRY_VALUE *value )
1636 {
1637         char *name = regval_name(value);
1638         REGF_HBIN *data_hbin;
1639
1640         ZERO_STRUCTP( vk );
1641
1642         memcpy( vk->header, "vk", REC_HDR_SIZE );
1643
1644         if ( name ) {
1645                 vk->valuename = talloc_strdup( file->mem_ctx, regval_name(value) );
1646                 vk->flag = VK_FLAG_NAME_PRESENT;
1647         }
1648
1649         vk->data_size = regval_size( value );
1650         vk->type      = regval_type( value );
1651
1652         if ( vk->data_size > sizeof(uint32) ) {
1653                 uint32 data_size = ( (vk->data_size+sizeof(uint32)) & 0xfffffff8 ) + 8;
1654
1655                 vk->data = (uint8 *)TALLOC_MEMDUP( file->mem_ctx,
1656                                                    regval_data_p(value),
1657                                                    vk->data_size );
1658                 if (vk->data == NULL) {
1659                         return False;
1660                 }
1661
1662                 /* go ahead and store the offset....we'll pick this hbin block back up when
1663                    we stream the data */
1664
1665                 if ((data_hbin = find_free_space(file, data_size )) == NULL) {
1666                         return False;
1667                 }
1668                 vk->data_off = prs_offset( &data_hbin->ps ) + data_hbin->first_hbin_off - HBIN_HDR_SIZE;
1669         }
1670         else {
1671                 /* make sure we don't try to copy from a NULL value pointer */
1672
1673                 if ( vk->data_size != 0 )
1674                         memcpy( &vk->data_off, regval_data_p(value), sizeof(uint32) );
1675                 vk->data_size |= VK_DATA_IN_OFFSET;
1676         }
1677
1678         return True;
1679 }
1680
1681 /*******************************************************************
1682 *******************************************************************/
1683
1684 static int hashrec_cmp( REGF_HASH_REC *h1, REGF_HASH_REC *h2 )
1685 {
1686         return StrCaseCmp( h1->fullname, h2->fullname );
1687 }
1688
1689 /*******************************************************************
1690 *******************************************************************/
1691
1692  REGF_NK_REC* regfio_write_key( REGF_FILE *file, const char *name,
1693                                REGVAL_CTR *values, REGSUBKEY_CTR *subkeys,
1694                                SEC_DESC *sec_desc, REGF_NK_REC *parent )
1695 {
1696         REGF_NK_REC *nk;
1697         REGF_HBIN *vlist_hbin = NULL;
1698         uint32 size;
1699
1700         if ( !(nk = TALLOC_ZERO_P( file->mem_ctx, REGF_NK_REC )) )
1701                 return NULL;
1702
1703         memcpy( nk->header, "nk", REC_HDR_SIZE );
1704
1705         if ( !parent )
1706                 nk->key_type = NK_TYPE_ROOTKEY;
1707         else
1708                 nk->key_type = NK_TYPE_NORMALKEY;
1709
1710         /* store the parent offset (or -1 if a the root key */
1711
1712         nk->parent_off = parent ? (parent->hbin_off + parent->hbin->file_off - REGF_BLOCKSIZE - HBIN_HDR_SIZE ) : REGF_OFFSET_NONE;
1713
1714         /* no classname currently */
1715
1716         nk->classname_off = REGF_OFFSET_NONE;
1717         nk->classname = NULL;
1718         nk->keyname = talloc_strdup( file->mem_ctx, name );
1719
1720         /* current modification time */
1721
1722         unix_to_nt_time( &nk->mtime, time(NULL) );
1723
1724         /* allocate the record on disk */
1725
1726         size = nk_record_data_size( nk );
1727         nk->rec_size = ( size - 1 ) ^ 0XFFFFFFFF;
1728         if ((nk->hbin = find_free_space( file, size )) == NULL) {
1729                 return NULL;
1730         }
1731         nk->hbin_off = prs_offset( &nk->hbin->ps );
1732
1733         /* Update the hash record in the parent */
1734
1735         if ( parent ) {
1736                 REGF_HASH_REC *hash = &parent->subkeys.hashes[parent->subkey_index];
1737
1738                 hash->nk_off = prs_offset( &nk->hbin->ps ) + nk->hbin->first_hbin_off - HBIN_HDR_SIZE;
1739                 memcpy( hash->keycheck, name, sizeof(uint32) );
1740                 hash->fullname = talloc_strdup( file->mem_ctx, name );
1741                 parent->subkey_index++;
1742
1743                 /* sort the list by keyname */
1744
1745                 qsort( parent->subkeys.hashes, parent->subkey_index, sizeof(REGF_HASH_REC), QSORT_CAST hashrec_cmp );
1746
1747                 if ( !hbin_prs_lf_records( "lf_rec", parent->subkeys.hbin, 0, parent ) )
1748                         return False;
1749         }
1750
1751         /* write the security descriptor */
1752
1753         nk->sk_off = REGF_OFFSET_NONE;
1754         if ( sec_desc ) {
1755                 uint32 sk_size = sk_record_data_size( sec_desc );
1756                 REGF_HBIN *sk_hbin;
1757
1758                 /* search for it in the existing list of sd's */
1759
1760                 if ( (nk->sec_desc = find_sk_record_by_sec_desc( file, sec_desc )) == NULL ) {
1761                         /* not found so add it to the list */
1762
1763                         if (!(sk_hbin = find_free_space( file, sk_size ))) {
1764                                 return NULL;
1765                         }
1766
1767                         if ( !(nk->sec_desc = TALLOC_ZERO_P( file->mem_ctx, REGF_SK_REC )) )
1768                                 return NULL;
1769
1770                         /* now we have to store the security descriptor in the list and
1771                            update the offsets */
1772
1773                         memcpy( nk->sec_desc->header, "sk", REC_HDR_SIZE );
1774                         nk->sec_desc->hbin      = sk_hbin;
1775                         nk->sec_desc->hbin_off  = prs_offset( &sk_hbin->ps );
1776                         nk->sec_desc->sk_off    = prs_offset( &sk_hbin->ps ) + sk_hbin->first_hbin_off - HBIN_HDR_SIZE;
1777                         nk->sec_desc->rec_size  = (sk_size-1)  ^ 0xFFFFFFFF;
1778
1779                         nk->sec_desc->sec_desc  = sec_desc;
1780                         nk->sec_desc->ref_count = 0;
1781
1782                         /* size value must be self-inclusive */
1783                         nk->sec_desc->size      = ndr_size_security_descriptor(sec_desc, 0)
1784                                 + sizeof(uint32);
1785
1786                         DLIST_ADD_END( file->sec_desc_list, nk->sec_desc, REGF_SK_REC *);
1787
1788                         /* update the offsets for us and the previous sd in the list.
1789                            if this is the first record, then just set the next and prev
1790                            offsets to ourself. */
1791
1792                         if ( nk->sec_desc->prev ) {
1793                                 REGF_SK_REC *prev = nk->sec_desc->prev;
1794
1795                                 nk->sec_desc->prev_sk_off = prev->hbin_off + prev->hbin->first_hbin_off - HBIN_HDR_SIZE;
1796                                 prev->next_sk_off = nk->sec_desc->sk_off;
1797
1798                                 /* the end must loop around to the front */
1799                                 nk->sec_desc->next_sk_off = file->sec_desc_list->sk_off;
1800
1801                                 /* and first must loop around to the tail */
1802                                 file->sec_desc_list->prev_sk_off = nk->sec_desc->sk_off;
1803                         } else {
1804                                 nk->sec_desc->prev_sk_off = nk->sec_desc->sk_off;
1805                                 nk->sec_desc->next_sk_off = nk->sec_desc->sk_off;
1806                         }
1807                 }
1808
1809                 /* bump the reference count +1 */
1810
1811                 nk->sk_off = nk->sec_desc->sk_off;
1812                 nk->sec_desc->ref_count++;
1813         }
1814
1815         /* write the subkeys */
1816
1817         nk->subkeys_off = REGF_OFFSET_NONE;
1818         if ( (nk->num_subkeys = regsubkey_ctr_numkeys( subkeys )) != 0 ) {
1819                 uint32 lf_size = lf_record_data_size( nk->num_subkeys );
1820                 uint32 namelen;
1821                 int i;
1822
1823                 if (!(nk->subkeys.hbin = find_free_space( file, lf_size ))) {
1824                         return NULL;
1825                 }
1826                 nk->subkeys.hbin_off = prs_offset( &nk->subkeys.hbin->ps );
1827                 nk->subkeys.rec_size = (lf_size-1) ^ 0xFFFFFFFF;
1828                 nk->subkeys_off = prs_offset( &nk->subkeys.hbin->ps ) + nk->subkeys.hbin->first_hbin_off - HBIN_HDR_SIZE;
1829
1830                 memcpy( nk->subkeys.header, "lf", REC_HDR_SIZE );
1831
1832                 nk->subkeys.num_keys = nk->num_subkeys;
1833                 if (nk->subkeys.num_keys) {
1834                         if ( !(nk->subkeys.hashes = TALLOC_ZERO_ARRAY( file->mem_ctx, REGF_HASH_REC, nk->subkeys.num_keys )) )
1835                                 return NULL;
1836                 } else {
1837                         nk->subkeys.hashes = NULL;
1838                 }
1839                 nk->subkey_index = 0;
1840
1841                 /* update the max_bytes_subkey{name,classname} fields */
1842                 for ( i=0; i<nk->num_subkeys; i++ ) {
1843                         namelen = strlen( regsubkey_ctr_specific_key(subkeys, i) );
1844                         if ( namelen*2 > nk->max_bytes_subkeyname )
1845                                 nk->max_bytes_subkeyname = namelen * 2;
1846                 }
1847         }
1848
1849         /* write the values */
1850
1851         nk->values_off = REGF_OFFSET_NONE;
1852         if ( (nk->num_values = regval_ctr_numvals( values )) != 0 ) {
1853                 uint32 vlist_size = ( ( nk->num_values * sizeof(uint32) ) & 0xfffffff8 ) + 8;
1854                 int i;
1855
1856                 if (!(vlist_hbin = find_free_space( file, vlist_size ))) {
1857                         return NULL;
1858                 }
1859                 nk->values_off = prs_offset( &vlist_hbin->ps ) + vlist_hbin->first_hbin_off - HBIN_HDR_SIZE;
1860
1861                 if (nk->num_values) {
1862                         if ( !(nk->values = TALLOC_ARRAY( file->mem_ctx, REGF_VK_REC, nk->num_values )) )
1863                                 return NULL;
1864                 } else {
1865                         nk->values = NULL;
1866                 }
1867
1868                 /* create the vk records */
1869
1870                 for ( i=0; i<nk->num_values; i++ ) {
1871                         uint32 vk_size, namelen, datalen;
1872                         REGISTRY_VALUE *r;
1873
1874                         r = regval_ctr_specific_value( values, i );
1875                         create_vk_record( file, &nk->values[i], r );
1876                         vk_size = vk_record_data_size( &nk->values[i] );
1877                         nk->values[i].hbin = find_free_space( file, vk_size );
1878                         nk->values[i].hbin_off = prs_offset( &nk->values[i].hbin->ps );
1879                         nk->values[i].rec_size = ( vk_size - 1 ) ^ 0xFFFFFFFF;
1880                         nk->values[i].rec_off = prs_offset( &nk->values[i].hbin->ps )
1881                                 + nk->values[i].hbin->first_hbin_off
1882                                 - HBIN_HDR_SIZE;
1883
1884                         /* update the max bytes fields if necessary */
1885
1886                         namelen = strlen( regval_name(r) );
1887                         if ( namelen*2 > nk->max_bytes_valuename )
1888                                 nk->max_bytes_valuename = namelen * 2;
1889
1890                         datalen = regval_size( r );
1891                         if ( datalen > nk->max_bytes_value )
1892                                 nk->max_bytes_value = datalen;
1893                 }
1894         }
1895
1896         /* stream the records */
1897
1898         prs_set_offset( &nk->hbin->ps, nk->hbin_off );
1899         if ( !prs_nk_rec( "nk_rec", &nk->hbin->ps, 0, nk ) )
1900                 return False;
1901
1902         if ( nk->num_values ) {
1903                 if ( !hbin_prs_vk_records( "vk_records", vlist_hbin, 0, nk, file ) )
1904                         return False;
1905         }
1906
1907
1908         regfio_flush( file );
1909
1910         return nk;
1911 }
1912