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 2 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, write to the Free Software
  18  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  19  */
  20
  21 #include "includes.h"
  22 #include "regfio.h"
  23
  24 /*******************************************************************
  25  *
  26  * TODO : Right now this code basically ignores classnames.
  27  *
  28  ******************************************************************/
  29
  30
  31 /*******************************************************************
  32 *******************************************************************/
  33
  34 static int write_block( REGF_FILE *file, prs_struct *ps, uint32 offset )
  35 {
  36         int bytes_written, returned;
  37         char *buffer = prs_data_p( ps );
  38         uint32 buffer_size = prs_data_size( ps );
  39         SMB_STRUCT_STAT sbuf;
  40
  41         if ( file->fd == -1 )
  42                 return -1;
  43
  44         /* check for end of file */
  45
  46         if ( sys_fstat( file->fd, &sbuf ) ) {
  47                 DEBUG(0,("write_block: stat() failed! (%s)\n", strerror(errno)));
  48                 return -1;
  49         }
  50
  51         if ( lseek( file->fd, offset, SEEK_SET ) == -1 ) {
  52                 DEBUG(0,("write_block: lseek() failed! (%s)\n", strerror(errno) ));
  53                 return -1;
  54         }
  55
  56         bytes_written = returned = 0;
  57         while ( bytes_written < buffer_size ) {
  58                 if ( (returned = write( file->fd, buffer+bytes_written, buffer_size-bytes_written )) == -1 ) {
  59                         DEBUG(0,("write_block: write() failed! (%s)\n", strerror(errno) ));
  60                         return False;
  61                 }
  62
  63                 bytes_written += returned;
  64         }
  65
  66         return bytes_written;
  67 }
  68
  69 /*******************************************************************
  70 *******************************************************************/
  71
  72 static int read_block( REGF_FILE *file, prs_struct *ps, uint32 file_offset, uint32 block_size )
  73 {
  74         int bytes_read, returned;
  75         char *buffer;
  76         SMB_STRUCT_STAT sbuf;
  77
  78         /* check for end of file */
  79
  80         if ( sys_fstat( file->fd, &sbuf ) ) {
  81                 DEBUG(0,("read_block: stat() failed! (%s)\n", strerror(errno)));
  82                 return -1;
  83         }
  84
  85         if ( (size_t)file_offset >= sbuf.st_size )
  86                 return -1;
  87
  88         /* if block_size == 0, we are parsnig HBIN records and need
  89            to read some of the header to get the block_size from there */
  90
  91         if ( block_size == 0 ) {
  92                 char hdr[0x20];
  93
  94                 if ( lseek( file->fd, file_offset, SEEK_SET ) == -1 ) {
  95                         DEBUG(0,("read_block: lseek() failed! (%s)\n", strerror(errno) ));
  96                         return -1;
  97                 }
  98
  99                 returned = read( file->fd, hdr, 0x20 );
 100                 if ( (returned == -1) || (returned < 0x20) ) {
 101                         DEBUG(0,("read_block: failed to read in HBIN header. Is the file corrupt?\n"));
 102                         return -1;
 103                 }
 104
 105                 /* make sure this is an hbin header */
 106
 107                 if ( strncmp( hdr, "hbin", HBIN_HDR_SIZE ) != 0 ) {
 108                         DEBUG(0,("read_block: invalid block header!\n"));
 109                         return -1;
 110                 }
 111
 112                 block_size = IVAL( hdr, 0x08 );
 113         }
 114
 115         DEBUG(10,("read_block: block_size == 0x%x\n", block_size ));
 116
 117         /* set the offset, initialize the buffer, and read the block from disk */
 118
 119         if ( lseek( file->fd, file_offset, SEEK_SET ) == -1 ) {
 120                 DEBUG(0,("read_block: lseek() failed! (%s)\n", strerror(errno) ));
 121                 return -1;
 122         }
 123
 124         prs_init( ps, block_size, file->mem_ctx, UNMARSHALL );
 125         buffer = prs_data_p( ps );
 126         bytes_read = returned = 0;
 127
 128         while ( bytes_read < block_size ) {
 129                 if ( (returned = read( file->fd, buffer+bytes_read, block_size-bytes_read )) == -1 ) {
 130                         DEBUG(0,("read_block: read() failed (%s)\n", strerror(errno) ));
 131                         return False;
 132                 }
 133                 if ( (returned == 0) && (bytes_read < block_size) ) {
 134                         DEBUG(0,("read_block: not a vald registry file ?\n" ));
 135                         return False;
 136                 }
 137
 138                 bytes_read += returned;
 139         }
 140
 141         return bytes_read;
 142 }
 143
 144 /*******************************************************************
 145 *******************************************************************/
 146
 147 static BOOL write_hbin_block( REGF_FILE *file, REGF_HBIN *hbin )
 148 {
 149         if ( !hbin->dirty )
 150                 return True;
 151
 152         /* write free space record if any is available */
 153
 154         if ( hbin->free_off != REGF_OFFSET_NONE ) {
 155                 uint32 header = 0xffffffff;
 156
 157                 if ( !prs_set_offset( &hbin->ps, hbin->free_off-sizeof(uint32) ) )
 158                         return False;
 159                 if ( !prs_uint32( "free_size", &hbin->ps, 0, &hbin->free_size ) )
 160                         return False;
 161                 if ( !prs_uint32( "free_header", &hbin->ps, 0, &header ) )
 162                         return False;
 163         }
 164
 165         hbin->dirty = (write_block( file, &hbin->ps, hbin->file_off ) != -1);
 166
 167         return hbin->dirty;
 168 }
 169
 170 /*******************************************************************
 171 *******************************************************************/
 172
 173 static BOOL hbin_block_close( REGF_FILE *file, REGF_HBIN *hbin )
 174 {
 175         REGF_HBIN *p;
 176
 177         /* remove the block from the open list and flush it to disk */
 178
 179         for ( p=file->block_list; p && p!=hbin; p=p->next )
 180                 ;;
 181
 182         if ( p == hbin ) {
 183                 DLIST_REMOVE( file->block_list, hbin );
 184         }
 185         else
 186                 DEBUG(0,("hbin_block_close: block not in open list!\n"));
 187
 188         if ( !write_hbin_block( file, hbin ) )
 189                 return False;
 190
 191         return True;
 192 }
 193
 194 /*******************************************************************
 195 *******************************************************************/
 196
 197 static BOOL prs_regf_block( const char *desc, prs_struct *ps, int depth, REGF_FILE *file )
 198 {
 199         prs_debug(ps, depth, desc, "prs_regf_block");
 200         depth++;
 201
 202         if ( !prs_uint8s( True, "header", ps, depth, file->header, sizeof( file->header )) )
 203                 return False;
 204
 205         /* yes, these values are always identical so store them only once */
 206
 207         if ( !prs_uint32( "unknown1", ps, depth, &file->unknown1 ))
 208                 return False;
 209         if ( !prs_uint32( "unknown1 (again)", ps, depth, &file->unknown1 ))
 210                 return False;
 211
 212         /* get the modtime */
 213
 214         if ( !prs_set_offset( ps, 0x0c ) )
 215                 return False;
 216         if ( !smb_io_time( "modtime", &file->mtime, ps, depth ) )
 217                 return False;
 218
 219         /* constants */
 220
 221         if ( !prs_uint32( "unknown2", ps, depth, &file->unknown2 ))
 222                 return False;
 223         if ( !prs_uint32( "unknown3", ps, depth, &file->unknown3 ))
 224                 return False;
 225         if ( !prs_uint32( "unknown4", ps, depth, &file->unknown4 ))
 226                 return False;
 227         if ( !prs_uint32( "unknown5", ps, depth, &file->unknown5 ))
 228                 return False;
 229
 230         /* get file offsets */
 231
 232         if ( !prs_set_offset( ps, 0x24 ) )
 233                 return False;
 234         if ( !prs_uint32( "data_offset", ps, depth, &file->data_offset ))
 235                 return False;
 236         if ( !prs_uint32( "last_block", ps, depth, &file->last_block ))
 237                 return False;
 238
 239         /* one more constant */
 240
 241         if ( !prs_uint32( "unknown6", ps, depth, &file->unknown6 ))
 242                 return False;
 243
 244         /* get the checksum */
 245
 246         if ( !prs_set_offset( ps, 0x01fc ) )
 247                 return False;
 248         if ( !prs_uint32( "checksum", ps, depth, &file->checksum ))
 249                 return False;
 250
 251         return True;
 252 }
 253
 254 /*******************************************************************
 255 *******************************************************************/
 256
 257 static BOOL prs_hbin_block( const char *desc, prs_struct *ps, int depth, REGF_HBIN *hbin )
 258 {
 259         uint32 block_size2;
 260
 261         prs_debug(ps, depth, desc, "prs_regf_block");
 262         depth++;
 263
 264         if ( !prs_uint8s( True, "header", ps, depth, hbin->header, sizeof( hbin->header )) )
 265                 return False;
 266
 267         if ( !prs_uint32( "first_hbin_off", ps, depth, &hbin->first_hbin_off ))
 268                 return False;
 269
 270         /* The dosreg.cpp comments say that the block size is at 0x1c.
 271            According to a WINXP NTUSER.dat file, this is wrong.  The block_size
 272            is at 0x08 */
 273
 274         if ( !prs_uint32( "block_size", ps, depth, &hbin->block_size ))
 275                 return False;
 276
 277         block_size2 = hbin->block_size;
 278         prs_set_offset( ps, 0x1c );
 279         if ( !prs_uint32( "block_size2", ps, depth, &block_size2 ))
 280                 return False;
 281
 282         if ( MARSHALLING(ps) )
 283                 hbin->dirty = True;
 284
 285
 286         return True;
 287 }
 288
 289 /*******************************************************************
 290 *******************************************************************/
 291
 292 static BOOL prs_nk_rec( const char *desc, prs_struct *ps, int depth, REGF_NK_REC *nk )
 293 {
 294         uint16 class_length, name_length;
 295         uint32 start;
 296         uint32 data_size, start_off, end_off;
 297         uint32 unknown_off = REGF_OFFSET_NONE;
 298
 299         nk->hbin_off = prs_offset( ps );
 300         start = nk->hbin_off;
 301
 302         prs_debug(ps, depth, desc, "prs_nk_rec");
 303         depth++;
 304
 305         /* back up and get the data_size */
 306
 307         if ( !prs_set_offset( ps, prs_offset(ps)-sizeof(uint32)) )
 308                 return False;
 309         start_off = prs_offset( ps );
 310         if ( !prs_uint32( "rec_size", ps, depth, &nk->rec_size ))
 311                 return False;
 312
 313         if ( !prs_uint8s( True, "header", ps, depth, nk->header, sizeof( nk->header )) )
 314                 return False;
 315
 316         if ( !prs_uint16( "key_type", ps, depth, &nk->key_type ))
 317                 return False;
 318         if ( !smb_io_time( "mtime", &nk->mtime, ps, depth ))
 319                 return False;
 320
 321         if ( !prs_set_offset( ps, start+0x0010 ) )
 322                 return False;
 323         if ( !prs_uint32( "parent_off", ps, depth, &nk->parent_off ))
 324                 return False;
 325         if ( !prs_uint32( "num_subkeys", ps, depth, &nk->num_subkeys ))
 326                 return False;
 327
 328         if ( !prs_set_offset( ps, start+0x001c ) )
 329                 return False;
 330         if ( !prs_uint32( "subkeys_off", ps, depth, &nk->subkeys_off ))
 331                 return False;
 332         if ( !prs_uint32( "unknown_off", ps, depth, &unknown_off) )
 333                 return False;
 334
 335         if ( !prs_set_offset( ps, start+0x0024 ) )
 336                 return False;
 337         if ( !prs_uint32( "num_values", ps, depth, &nk->num_values ))
 338                 return False;
 339         if ( !prs_uint32( "values_off", ps, depth, &nk->values_off ))
 340                 return False;
 341         if ( !prs_uint32( "sk_off", ps, depth, &nk->sk_off ))
 342                 return False;
 343         if ( !prs_uint32( "classname_off", ps, depth, &nk->classname_off ))
 344                 return False;
 345
 346         if ( !prs_uint32( "max_bytes_subkeyname", ps, depth, &nk->max_bytes_subkeyname))
 347                 return False;
 348         if ( !prs_uint32( "max_bytes_subkeyclassname", ps, depth, &nk->max_bytes_subkeyclassname))
 349                 return False;
 350         if ( !prs_uint32( "max_bytes_valuename", ps, depth, &nk->max_bytes_valuename))
 351                 return False;
 352         if ( !prs_uint32( "max_bytes_value", ps, depth, &nk->max_bytes_value))
 353                 return False;
 354         if ( !prs_uint32( "unknown index", ps, depth, &nk->unk_index))
 355                 return False;
 356
 357         name_length = nk->keyname ? strlen(nk->keyname) : 0 ;
 358         class_length = nk->classname ? strlen(nk->classname) : 0 ;
 359         if ( !prs_uint16( "name_length", ps, depth, &name_length ))
 360                 return False;
 361         if ( !prs_uint16( "class_length", ps, depth, &class_length ))
 362                 return False;
 363
 364         if ( class_length ) {
 365                 ;;
 366         }
 367
 368         if ( name_length ) {
 369                 if ( UNMARSHALLING(ps) ) {
 370                         if ( !(nk->keyname = PRS_ALLOC_MEM( ps, char, name_length+1 )) )
 371                                 return False;
 372                 }
 373
 374                 if ( !prs_uint8s( True, "name", ps, depth, nk->keyname, name_length) )
 375                         return False;
 376
 377                 if ( UNMARSHALLING(ps) )
 378                         nk->keyname[name_length] = '\0';
 379         }
 380
 381         end_off = prs_offset( ps );
 382
 383         /* data_size must be divisible by 8 and large enough to hold the original record */
 384
 385         data_size = ((start_off - end_off) & 0xfffffff8 );
 386         if ( data_size > nk->rec_size )
 387                 DEBUG(10,("Encountered reused record (0x%x < 0x%x)\n", data_size, nk->rec_size));
 388
 389         if ( MARSHALLING(ps) )
 390                 nk->hbin->dirty = True;
 391
 392         return True;
 393 }
 394
 395 /*******************************************************************
 396 *******************************************************************/
 397
 398 static uint32 regf_block_checksum( prs_struct *ps )
 399 {
 400         char *buffer = prs_data_p( ps );
 401         uint32 checksum, x;
 402         int i;
 403
 404         /* XOR of all bytes 0x0000 - 0x01FB */
 405
 406         checksum = x = 0;
 407
 408         for ( i=0; i<0x01FB; i+=4 ) {
 409                 x = IVAL(buffer, i );
 410                 checksum ^= x;
 411         }
 412
 413         return checksum;
 414 }
 415
 416 /*******************************************************************
 417 *******************************************************************/
 418
 419 static BOOL read_regf_block( REGF_FILE *file )
 420 {
 421         prs_struct ps;
 422         uint32 checksum;
 423
 424         /* grab the first block from the file */
 425
 426         if ( read_block( file, &ps, 0, REGF_BLOCKSIZE ) == -1 )
 427                 return False;
 428
 429         /* parse the block and verify the checksum */
 430
 431         if ( !prs_regf_block( "regf_header", &ps, 0, file ) )
 432                 return False;
 433
 434         checksum = regf_block_checksum( &ps );
 435
 436         prs_mem_free( &ps );
 437
 438         if ( file->checksum !=  checksum ) {
 439                 DEBUG(0,("read_regf_block: invalid checksum\n" ));
 440                 return False;
 441         }
 442
 443         return True;
 444 }
 445
 446 /*******************************************************************
 447 *******************************************************************/
 448
 449 static REGF_HBIN* read_hbin_block( REGF_FILE *file, off_t offset )
 450 {
 451         REGF_HBIN *hbin;
 452         uint32 record_size, curr_off, block_size, header;
 453
 454         if ( !(hbin = TALLOC_ZERO_P(file->mem_ctx, REGF_HBIN)) )
 455                 return NULL;
 456         hbin->file_off = offset;
 457         hbin->free_off = -1;
 458
 459         if ( read_block( file, &hbin->ps, offset, 0 ) == -1 )
 460                 return NULL;
 461
 462         if ( !prs_hbin_block( "hbin", &hbin->ps, 0, hbin ) )
 463                 return NULL;
 464
 465         /* this should be the same thing as hbin->block_size but just in case */
 466
 467         block_size = prs_data_size( &hbin->ps );
 468
 469         /* Find the available free space offset.  Always at the end,
 470            so walk the record list and stop when you get to the end.
 471            The end is defined by a record header of 0xffffffff.  The
 472            previous 4 bytes contains the amount of free space remaining
 473            in the hbin block. */
 474
 475         /* remember that the record_size is in the 4 bytes preceeding the record itself */
 476
 477         if ( !prs_set_offset( &hbin->ps, file->data_offset+HBIN_HDR_SIZE-sizeof(uint32) ) )
 478                 return False;
 479
 480         record_size = 0;
 481         header = 0;
 482         curr_off = prs_offset( &hbin->ps );
 483         while ( header != 0xffffffff ) {
 484                 /* not done yet so reset the current offset to the
 485                    next record_size field */
 486
 487                 curr_off = curr_off+record_size;
 488
 489                 /* for some reason the record_size of the last record in
 490                    an hbin block can extend past the end of the block
 491                    even though the record fits within the remaining
 492                    space....aaarrrgggghhhhhh */
 493
 494                 if ( curr_off >= block_size ) {
 495                         record_size = -1;
 496                         curr_off = -1;
 497                         break;
 498                 }
 499
 500                 if ( !prs_set_offset( &hbin->ps, curr_off) )
 501                         return False;
 502
 503                 if ( !prs_uint32( "rec_size", &hbin->ps, 0, &record_size ) )
 504                         return False;
 505                 if ( !prs_uint32( "header", &hbin->ps, 0, &header ) )
 506                         return False;
 507
 508                 SMB_ASSERT( record_size != 0 );
 509
 510                 if ( record_size & 0x80000000 ) {
 511                         /* absolute_value(record_size) */
 512                         record_size = (record_size ^ 0xffffffff) + 1;
 513                 }
 514         }
 515
 516         /* save the free space offset */
 517
 518         if ( header == 0xffffffff ) {
 519
 520                 /* account for the fact that the curr_off is 4 bytes behind the actual
 521                    record header */
 522
 523                 hbin->free_off = curr_off + sizeof(uint32);
 524                 hbin->free_size = record_size;
 525         }
 526
 527         DEBUG(10,("read_hbin_block: free space offset == 0x%x\n", hbin->free_off));
 528
 529         if ( !prs_set_offset( &hbin->ps, file->data_offset+HBIN_HDR_SIZE )  )
 530                 return False;
 531
 532         return hbin;
 533 }
 534
 535 /*******************************************************************
 536  Input a randon offset and receive the correpsonding HBIN
 537  block for it
 538 *******************************************************************/
 539
 540 static BOOL hbin_contains_offset( REGF_HBIN *hbin, uint32 offset )
 541 {
 542         if ( !hbin )
 543                 return False;
 544
 545         if ( (offset > hbin->first_hbin_off) && (offset < (hbin->first_hbin_off+hbin->block_size)) )
 546                 return True;
 547
 548         return False;
 549 }
 550
 551 /*******************************************************************
 552  Input a randon offset and receive the correpsonding HBIN
 553  block for it
 554 *******************************************************************/
 555
 556 static REGF_HBIN* lookup_hbin_block( REGF_FILE *file, uint32 offset )
 557 {
 558         REGF_HBIN *hbin = NULL;
 559         uint32 block_off;
 560
 561         /* start with the open list */
 562
 563         for ( hbin=file->block_list; hbin; hbin=hbin->next ) {
 564                 DEBUG(10,("lookup_hbin_block: address = 0x%x [0x%x]\n", hbin->file_off, (uint32)hbin ));
 565                 if ( hbin_contains_offset( hbin, offset ) )
 566                         return hbin;
 567         }
 568
 569         if ( !hbin ) {
 570                 /* start at the beginning */
 571
 572                 block_off = REGF_BLOCKSIZE;
 573                 do {
 574                         /* cleanup before the next round */
 575                         if ( hbin )
 576                                 prs_mem_free( &hbin->ps );
 577
 578                         hbin = read_hbin_block( file, block_off );
 579
 580                         if ( hbin )
 581                                 block_off = hbin->file_off + hbin->block_size;
 582
 583                 } while ( hbin && !hbin_contains_offset( hbin, offset ) );
 584         }
 585
 586         if ( hbin )
 587                 DLIST_ADD( file->block_list, hbin );
 588
 589         return hbin;
 590 }
 591
 592 /*******************************************************************
 593 *******************************************************************/
 594
 595 static BOOL prs_hash_rec( const char *desc, prs_struct *ps, int depth, REGF_HASH_REC *hash )
 596 {
 597         prs_debug(ps, depth, desc, "prs_hash_rec");
 598         depth++;
 599
 600         if ( !prs_uint32( "nk_off", ps, depth, &hash->nk_off ))
 601                 return False;
 602         if ( !prs_uint8s( True, "keycheck", ps, depth, hash->keycheck, sizeof( hash->keycheck )) )
 603                 return False;
 604
 605         return True;
 606 }
 607
 608 /*******************************************************************
 609 *******************************************************************/
 610
 611 static BOOL hbin_prs_lf_records( const char *desc, REGF_HBIN *hbin, int depth, REGF_NK_REC *nk )
 612 {
 613         int i;
 614         REGF_LF_REC *lf = &nk->subkeys;
 615         uint32 data_size, start_off, end_off;
 616
 617         prs_debug(&hbin->ps, depth, desc, "prs_lf_records");
 618         depth++;
 619
 620         /* check if we have anything to do first */
 621
 622         if ( nk->num_subkeys == 0 )
 623                 return True;
 624
 625         /* move to the LF record */
 626
 627         if ( !prs_set_offset( &hbin->ps, nk->subkeys_off + HBIN_HDR_SIZE - hbin->first_hbin_off ) )
 628                 return False;
 629
 630         /* backup and get the data_size */
 631
 632         if ( !prs_set_offset( &hbin->ps, prs_offset(&hbin->ps)-sizeof(uint32)) )
 633                 return False;
 634         start_off = prs_offset( &hbin->ps );
 635         if ( !prs_uint32( "rec_size", &hbin->ps, depth, &lf->rec_size ))
 636                 return False;
 637
 638         if ( !prs_uint8s( True, "header", &hbin->ps, depth, lf->header, sizeof( lf->header )) )
 639                 return False;
 640
 641         if ( !prs_uint16( "num_keys", &hbin->ps, depth, &lf->num_keys))
 642                 return False;
 643
 644         if ( UNMARSHALLING(&hbin->ps) ) {
 645                 if ( !(lf->hashes = PRS_ALLOC_MEM( &hbin->ps, REGF_HASH_REC, lf->num_keys )) )
 646                         return False;
 647         }
 648
 649         for ( i=0; i<lf->num_keys; i++ ) {
 650                 if ( !prs_hash_rec( "hash_rec", &hbin->ps, depth, &lf->hashes[i] ) )
 651                         return False;
 652         }
 653
 654         end_off = prs_offset( &hbin->ps );
 655
 656         /* data_size must be divisible by 8 and large enough to hold the original record */
 657
 658         data_size = ((start_off - end_off) & 0xfffffff8 );
 659         if ( data_size > lf->rec_size )
 660                 DEBUG(10,("Encountered reused record (0x%x < 0x%x)\n", data_size, lf->rec_size));
 661
 662         if ( MARSHALLING(&hbin->ps) )
 663                 hbin->dirty = True;
 664
 665         return True;
 666 }
 667
 668 /*******************************************************************
 669 *******************************************************************/
 670
 671 static BOOL hbin_prs_sk_rec( const char *desc, REGF_HBIN *hbin, int depth, REGF_SK_REC *sk )
 672 {
 673         prs_struct *ps = &hbin->ps;
 674         uint16 tag = 0xFFFF;
 675         uint32 data_size, start_off, end_off;
 676
 677
 678         prs_debug(ps, depth, desc, "hbin_prs_sk_rec");
 679         depth++;
 680
 681         if ( !prs_set_offset( &hbin->ps, sk->sk_off + HBIN_HDR_SIZE - hbin->first_hbin_off ) )
 682                 return False;
 683
 684         /* backup and get the data_size */
 685
 686         if ( !prs_set_offset( &hbin->ps, prs_offset(&hbin->ps)-sizeof(uint32)) )
 687                 return False;
 688         start_off = prs_offset( &hbin->ps );
 689         if ( !prs_uint32( "rec_size", &hbin->ps, depth, &sk->rec_size ))
 690                 return False;
 691
 692         if ( !prs_uint8s( True, "header", ps, depth, sk->header, sizeof( sk->header )) )
 693                 return False;
 694         if ( !prs_uint16( "tag", ps, depth, &tag))
 695                 return False;
 696
 697         if ( !prs_uint32( "prev_sk_off", ps, depth, &sk->prev_sk_off))
 698                 return False;
 699         if ( !prs_uint32( "next_sk_off", ps, depth, &sk->next_sk_off))
 700                 return False;
 701         if ( !prs_uint32( "ref_count", ps, depth, &sk->ref_count))
 702                 return False;
 703         if ( !prs_uint32( "size", ps, depth, &sk->size))
 704                 return False;
 705
 706         if ( !sec_io_desc( "sec_desc", &sk->sec_desc, ps, depth ))
 707                 return False;
 708
 709         end_off = prs_offset( &hbin->ps );
 710
 711         /* data_size must be divisible by 8 and large enough to hold the original record */
 712
 713         data_size = ((start_off - end_off) & 0xfffffff8 );
 714         if ( data_size > sk->rec_size )
 715                 DEBUG(10,("Encountered reused record (0x%x < 0x%x)\n", data_size, sk->rec_size));
 716
 717         if ( MARSHALLING(&hbin->ps) )
 718                 hbin->dirty = True;
 719
 720         return True;
 721 }
 722
 723 /*******************************************************************
 724 *******************************************************************/
 725
 726 static BOOL hbin_prs_vk_rec( const char *desc, REGF_HBIN *hbin, int depth, REGF_VK_REC *vk, REGF_FILE *file )
 727 {
 728         uint32 offset;
 729         uint16 name_length;
 730         prs_struct *ps = &hbin->ps;
 731         uint32 data_size, start_off, end_off;
 732
 733         prs_debug(ps, depth, desc, "prs_vk_rec");
 734         depth++;
 735
 736         /* backup and get the data_size */
 737
 738         if ( !prs_set_offset( &hbin->ps, prs_offset(&hbin->ps)-sizeof(uint32)) )
 739                 return False;
 740         start_off = prs_offset( &hbin->ps );
 741         if ( !prs_uint32( "rec_size", &hbin->ps, depth, &vk->rec_size ))
 742                 return False;
 743
 744         if ( !prs_uint8s( True, "header", ps, depth, vk->header, sizeof( vk->header )) )
 745                 return False;
 746
 747         if ( MARSHALLING(&hbin->ps) )
 748                 name_length = strlen(vk->valuename);
 749
 750         if ( !prs_uint16( "name_length", ps, depth, &name_length ))
 751                 return False;
 752         if ( !prs_uint32( "data_size", ps, depth, &vk->data_size ))
 753                 return False;
 754         if ( !prs_uint32( "data_off", ps, depth, &vk->data_off ))
 755                 return False;
 756         if ( !prs_uint32( "type", ps, depth, &vk->type))
 757                 return False;
 758         if ( !prs_uint16( "flag", ps, depth, &vk->flag))
 759                 return False;
 760
 761         offset = prs_offset( ps );
 762         offset += 2;    /* skip 2 bytes */
 763         prs_set_offset( ps, offset );
 764
 765         /* get the name */
 766
 767         if ( vk->flag&VK_FLAG_NAME_PRESENT ) {
 768
 769                 if ( UNMARSHALLING(&hbin->ps) ) {
 770                         if ( !(vk->valuename = PRS_ALLOC_MEM( ps, char, name_length+1 )))
 771                                 return False;
 772                 }
 773                 if ( !prs_uint8s( True, "name", ps, depth, vk->valuename, name_length ) )
 774                         return False;
 775         }
 776
 777         end_off = prs_offset( &hbin->ps );
 778
 779         /* get the data if necessary */
 780
 781         if ( vk->data_size != 0 ) {
 782                 BOOL charmode = False;
 783
 784                 if ( (vk->type == REG_SZ) || (vk->type == REG_MULTI_SZ) )
 785                         charmode = True;
 786
 787                 /* the data is stored in the offset if the size <= 4 */
 788
 789                 if ( !(vk->data_size & VK_DATA_IN_OFFSET) ) {
 790                         REGF_HBIN *hblock = hbin;
 791                         uint32 data_rec_size;
 792
 793                         if ( UNMARSHALLING(&hbin->ps) ) {
 794                                 if ( !(vk->data = PRS_ALLOC_MEM( ps, uint8, vk->data_size) ) )
 795                                         return False;
 796                         }
 797
 798                         /* this data can be in another hbin */
 799                         if ( !hbin_contains_offset( hbin, vk->data_off ) ) {
 800                                 if ( !(hblock = lookup_hbin_block( file, vk->data_off )) )
 801                                         return False;
 802                         }
 803                         if ( !(prs_set_offset( &hblock->ps, (vk->data_off+HBIN_HDR_SIZE-hblock->first_hbin_off)-sizeof(uint32) )) )
 804                                 return False;
 805
 806                         if ( MARSHALLING(&hblock->ps) ) {
 807                                 data_rec_size = ( (vk->data_size+sizeof(uint32)) & 0xfffffff8 ) + 8;
 808                                 data_rec_size = ( data_rec_size - 1 ) ^ 0xFFFFFFFF;
 809                         }
 810                         if ( !prs_uint32( "data_rec_size", &hblock->ps, depth, &data_rec_size ))
 811                                 return False;
 812                         if ( !prs_uint8s( charmode, "data", &hblock->ps, depth, vk->data, vk->data_size) )
 813                                 return False;
 814
 815                         if ( MARSHALLING(&hblock->ps) )
 816                                 hblock->dirty = True;
 817                 }
 818                 else {
 819                         if ( !(vk->data = PRS_ALLOC_MEM( ps, uint8, 4 ) ) )
 820                                 return False;
 821                         SIVAL( vk->data, 0, vk->data_off );
 822                 }
 823
 824         }
 825
 826         /* data_size must be divisible by 8 and large enough to hold the original record */
 827
 828         data_size = ((start_off - end_off ) & 0xfffffff8 );
 829         if ( data_size !=  vk->rec_size )
 830                 DEBUG(10,("prs_vk_rec: data_size check failed (0x%x < 0x%x)\n", data_size, vk->rec_size));
 831
 832         if ( MARSHALLING(&hbin->ps) )
 833                 hbin->dirty = True;
 834
 835         return True;
 836 }
 837
 838 /*******************************************************************
 839  read a VK record which is contained in the HBIN block stored
 840  in the prs_struct *ps.
 841 *******************************************************************/
 842
 843 static BOOL hbin_prs_vk_records( const char *desc, REGF_HBIN *hbin, int depth, REGF_NK_REC *nk, REGF_FILE *file )
 844 {
 845         int i;
 846         uint32 record_size;
 847
 848         prs_debug(&hbin->ps, depth, desc, "prs_vk_records");
 849         depth++;
 850
 851         /* check if we have anything to do first */
 852
 853         if ( nk->num_values == 0 )
 854                 return True;
 855
 856         if ( UNMARSHALLING(&hbin->ps) ) {
 857                 if ( !(nk->values = PRS_ALLOC_MEM( &hbin->ps, REGF_VK_REC, nk->num_values ) ) )
 858                         return False;
 859         }
 860
 861         /* convert the offset to something relative to this HBIN block */
 862
 863         if ( !prs_set_offset( &hbin->ps, nk->values_off+HBIN_HDR_SIZE-hbin->first_hbin_off-sizeof(uint32)) )
 864                 return False;
 865
 866         if ( MARSHALLING( &hbin->ps) ) {
 867                 record_size = ( ( nk->num_values * sizeof(uint32) ) & 0xfffffff8 ) + 8;
 868                 record_size = (record_size - 1) ^ 0xFFFFFFFF;
 869         }
 870
 871         if ( !prs_uint32( "record_size", &hbin->ps, depth, &record_size ) )
 872                 return False;
 873
 874         for ( i=0; i<nk->num_values; i++ ) {
 875                 if ( !prs_uint32( "vk_off", &hbin->ps, depth, &nk->values[i].rec_off ) )
 876                         return False;
 877         }
 878
 879         for ( i=0; i<nk->num_values; i++ ) {
 880                 REGF_HBIN *sub_hbin = hbin;
 881                 uint32 new_offset;
 882
 883                 if ( !hbin_contains_offset( hbin, nk->values[i].rec_off ) ) {
 884                         sub_hbin = lookup_hbin_block( file, nk->values[i].rec_off );
 885                         if ( !sub_hbin ) {
 886                                 DEBUG(0,("hbin_prs_vk_records: Failed to find HBIN block containing offset [0x%x]\n",
 887                                         nk->values[i].hbin_off));
 888                                 return False;
 889                         }
 890                 }
 891
 892                 new_offset = nk->values[i].rec_off + HBIN_HDR_SIZE - sub_hbin->first_hbin_off;
 893                 if ( !prs_set_offset( &sub_hbin->ps, new_offset ) )
 894                         return False;
 895                 if ( !hbin_prs_vk_rec( "vk_rec", sub_hbin, depth, &nk->values[i], file ) )
 896                         return False;
 897         }
 898
 899         if ( MARSHALLING(&hbin->ps) )
 900                 hbin->dirty = True;
 901
 902
 903         return True;
 904 }
 905
 906
 907 /*******************************************************************
 908 *******************************************************************/
 909
 910 static REGF_SK_REC* find_sk_record_by_offset( REGF_FILE *file, uint32 offset )
 911 {
 912         REGF_SK_REC *p_sk;
 913
 914         for ( p_sk=file->sec_desc_list; p_sk; p_sk=p_sk->next ) {
 915                 if ( p_sk->sk_off == offset )
 916                         return p_sk;
 917         }
 918
 919         return NULL;
 920 }
 921
 922 /*******************************************************************
 923 *******************************************************************/
 924
 925 static REGF_SK_REC* find_sk_record_by_sec_desc( REGF_FILE *file, SEC_DESC *sd )
 926 {
 927         REGF_SK_REC *p;
 928
 929         for ( p=file->sec_desc_list; p; p=p->next ) {
 930                 if ( sec_desc_equal( p->sec_desc, sd ) )
 931                         return p;
 932         }
 933
 934         /* failure */
 935
 936         return NULL;
 937 }
 938
 939 /*******************************************************************
 940 *******************************************************************/
 941
 942 static BOOL hbin_prs_key( REGF_FILE *file, REGF_HBIN *hbin, REGF_NK_REC *nk )
 943 {
 944         int depth = 0;
 945         REGF_HBIN *sub_hbin;
 946
 947         prs_debug(&hbin->ps, depth, "", "fetch_key");
 948         depth++;
 949
 950         /* get the initial nk record */
 951
 952         if ( !prs_nk_rec( "nk_rec", &hbin->ps, depth, nk ))
 953                 return False;
 954
 955         /* fill in values */
 956
 957         if ( nk->num_values && (nk->values_off!=REGF_OFFSET_NONE) ) {
 958                 sub_hbin = hbin;
 959                 if ( !hbin_contains_offset( hbin, nk->values_off ) ) {
 960                         sub_hbin = lookup_hbin_block( file, nk->values_off );
 961                         if ( !sub_hbin ) {
 962                                 DEBUG(0,("hbin_prs_key: Failed to find HBIN block containing value_list_offset [0x%x]\n",
 963                                         nk->values_off));
 964                                 return False;
 965                         }
 966                 }
 967
 968                 if ( !hbin_prs_vk_records( "vk_rec", sub_hbin, depth, nk, file ))
 969                         return False;
 970         }
 971
 972         /* now get subkeys */
 973
 974         if ( nk->num_subkeys && (nk->subkeys_off!=REGF_OFFSET_NONE) ) {
 975                 sub_hbin = hbin;
 976                 if ( !hbin_contains_offset( hbin, nk->subkeys_off ) ) {
 977                         sub_hbin = lookup_hbin_block( file, nk->subkeys_off );
 978                         if ( !sub_hbin ) {
 979                                 DEBUG(0,("hbin_prs_key: Failed to find HBIN block containing subkey_offset [0x%x]\n",
 980                                         nk->subkeys_off));
 981                                 return False;
 982                         }
 983                 }
 984
 985                 if ( !hbin_prs_lf_records( "lf_rec", sub_hbin, depth, nk ))
 986                         return False;
 987         }
 988
 989         /* get the to the security descriptor.  First look if we have already parsed it */
 990
 991         if ( (nk->sk_off!=REGF_OFFSET_NONE) && !( nk->sec_desc = find_sk_record_by_offset( file, nk->sk_off )) ) {
 992
 993                 sub_hbin = hbin;
 994                 if ( !hbin_contains_offset( hbin, nk->sk_off ) ) {
 995                         sub_hbin = lookup_hbin_block( file, nk->sk_off );
 996                         if ( !sub_hbin ) {
 997                                 DEBUG(0,("hbin_prs_key: Failed to find HBIN block containing sk_offset [0x%x]\n",
 998                                         nk->subkeys_off));
 999                                 return False;
1000                         }
1001                 }
1002
1003                 if ( !(nk->sec_desc = TALLOC_ZERO_P( file->mem_ctx, REGF_SK_REC )) )
1004                         return False;
1005                 nk->sec_desc->sk_off = nk->sk_off;
1006                 if ( !hbin_prs_sk_rec( "sk_rec", sub_hbin, depth, nk->sec_desc ))
1007                         return False;
1008
1009                 /* add to the list of security descriptors (ref_count has been read from the files) */
1010
1011                 nk->sec_desc->sk_off = nk->sk_off;
1012                 DLIST_ADD( file->sec_desc_list, nk->sec_desc );
1013         }
1014
1015         return True;
1016 }
1017
1018 /*******************************************************************
1019 *******************************************************************/
1020
1021 static BOOL next_record( REGF_HBIN *hbin, const char *hdr, BOOL *eob )
1022 {
1023         char header[REC_HDR_SIZE] = "";
1024         uint32 record_size;
1025         uint32 curr_off, block_size;
1026         BOOL found = False;
1027         prs_struct *ps = &hbin->ps;
1028
1029         curr_off = prs_offset( ps );
1030         if ( curr_off == 0 )
1031                 prs_set_offset( ps, HBIN_HEADER_REC_SIZE );
1032
1033         /* assume that the current offset is at the reacord header
1034            and we need to backup to read the record size */
1035
1036         curr_off -= sizeof(uint32);
1037
1038         block_size = prs_data_size( ps );
1039         record_size = 0;
1040         while ( !found ) {
1041
1042                 curr_off = curr_off+record_size;
1043                 if ( curr_off >= block_size )
1044                         break;
1045
1046                 if ( !prs_set_offset( &hbin->ps, curr_off) )
1047                         return False;
1048
1049                 if ( !prs_uint32( "record_size", ps, 0, &record_size ) )
1050                         return False;
1051                 if ( !prs_uint8s( True, "header", ps, 0, header, REC_HDR_SIZE ) )
1052                         return False;
1053
1054                 if ( record_size & 0x80000000 ) {
1055                         /* absolute_value(record_size) */
1056                         record_size = (record_size ^ 0xffffffff) + 1;
1057                 }
1058
1059                 if ( memcmp( header, hdr, REC_HDR_SIZE ) == 0 ) {
1060                         found = True;
1061                         curr_off += sizeof(uint32);
1062                 }
1063         }
1064
1065         /* mark prs_struct as done ( at end ) if no more SK records */
1066         /* mark end-of-block as True */
1067
1068         if ( !found ) {
1069                 prs_set_offset( &hbin->ps, prs_data_size(&hbin->ps) );
1070                 *eob = True;
1071                 return False;
1072         }
1073
1074         if ( !prs_set_offset( ps, curr_off ) )
1075                 return False;
1076
1077         return True;
1078 }
1079
1080 /*******************************************************************
1081 *******************************************************************/
1082
1083 static BOOL next_nk_record( REGF_FILE *file, REGF_HBIN *hbin, REGF_NK_REC *nk, BOOL *eob )
1084 {
1085         if ( next_record( hbin, "nk", eob ) && hbin_prs_key( file, hbin, nk ) )
1086                 return True;
1087
1088         return False;
1089 }
1090
1091 /*******************************************************************
1092  Intialize the newly created REGF_BLOCK in *file and write the
1093  block header to disk
1094 *******************************************************************/
1095
1096 static BOOL init_regf_block( REGF_FILE *file )
1097 {
1098         prs_struct ps;
1099         BOOL result = True;
1100
1101         if ( !prs_init( &ps, REGF_BLOCKSIZE, file->mem_ctx, MARSHALL ) )
1102                 return False;
1103
1104         memcpy( file->header, "regf", REGF_HDR_SIZE );
1105         file->data_offset = 0x20;
1106         file->last_block  = 0x1000;
1107
1108         /* set mod time */
1109
1110         unix_to_nt_time( &file->mtime, time(NULL) );
1111
1112         /* hard coded values...no diea what these are ... maybe in time */
1113
1114         file->unknown1 = 0x2;
1115         file->unknown2 = 0x1;
1116         file->unknown3 = 0x3;
1117         file->unknown4 = 0x0;
1118         file->unknown5 = 0x1;
1119         file->unknown6 = 0x1;
1120
1121         /* write header to the buffer */
1122
1123         if ( !prs_regf_block( "regf_header", &ps, 0, file ) ) {
1124                 result = False;
1125                 goto out;
1126         }
1127
1128         /* calculate the checksum, re-marshall data (to include the checksum)
1129            and write to disk */
1130
1131         file->checksum = regf_block_checksum( &ps );
1132         prs_set_offset( &ps, 0 );
1133         if ( !prs_regf_block( "regf_header", &ps, 0, file ) ) {
1134                 result = False;
1135                 goto out;
1136         }
1137
1138         if ( write_block( file, &ps, 0 ) == -1 ) {
1139                 DEBUG(0,("init_regf_block: Failed to initialize registry header block!\n"));
1140                 result = False;
1141                 goto out;
1142         }
1143
1144 out:
1145         prs_mem_free( &ps );
1146
1147         return result;
1148 }
1149 /*******************************************************************
1150  Open the registry file and then read in the REGF block to get the
1151  first hbin offset.
1152 *******************************************************************/
1153
1154  REGF_FILE* regfio_open( const char *filename, int flags, int mode )
1155 {
1156         REGF_FILE *rb;
1157
1158         if ( !(rb = SMB_MALLOC_P(REGF_FILE)) ) {
1159                 DEBUG(0,("ERROR allocating memory\n"));
1160                 return NULL;
1161         }
1162         ZERO_STRUCTP( rb );
1163         rb->fd = -1;
1164
1165         if ( !(rb->mem_ctx = talloc_init( "read_regf_block" )) ) {
1166                 regfio_close( rb );
1167                 return NULL;
1168         }
1169
1170         rb->open_flags = flags;
1171
1172         /* open and existing file */
1173
1174         if ( (rb->fd = open(filename, flags, mode)) == -1 ) {
1175                 DEBUG(0,("regfio_open: failure to open %s (%s)\n", filename, strerror(errno)));
1176                 regfio_close( rb );
1177                 return NULL;
1178         }
1179
1180         /* check if we are creating a new file or overwriting an existing one */
1181
1182         if ( flags & (O_CREAT|O_TRUNC) ) {
1183                 if ( !init_regf_block( rb ) ) {
1184                         DEBUG(0,("regfio_open: Failed to read initial REGF block\n"));
1185                         regfio_close( rb );
1186                         return NULL;
1187                 }
1188
1189                 /* success */
1190                 return rb;
1191         }
1192
1193         /* read in an existing file */
1194
1195         if ( !read_regf_block( rb ) ) {
1196                 DEBUG(0,("regfio_open: Failed to read initial REGF block\n"));
1197                 regfio_close( rb );
1198                 return NULL;
1199         }
1200
1201         /* success */
1202
1203         return rb;
1204 }
1205
1206 /*******************************************************************
1207 *******************************************************************/
1208
1209 static void regfio_mem_free( REGF_FILE *file )
1210 {
1211         /* free any talloc()'d memory */
1212
1213         if ( file && file->mem_ctx )
1214                 talloc_destroy( file->mem_ctx );
1215 }
1216
1217 /*******************************************************************
1218 *******************************************************************/
1219
1220  int regfio_close( REGF_FILE *file )
1221 {
1222         int fd;
1223
1224         /* cleanup for a file opened for write */
1225
1226         if ( file->open_flags & (O_WRONLY|O_RDWR) ) {
1227                 prs_struct ps;
1228                 REGF_SK_REC *sk;
1229
1230                 /* write of sd list */
1231
1232                 for ( sk=file->sec_desc_list; sk; sk=sk->next ) {
1233                         hbin_prs_sk_rec( "sk_rec", sk->hbin, 0, sk );
1234                 }
1235
1236                 /* flush any dirty blocks */
1237
1238                 while ( file->block_list ) {
1239                         hbin_block_close( file, file->block_list );
1240                 }
1241
1242                 ZERO_STRUCT( ps );
1243
1244                 unix_to_nt_time( &file->mtime, time(NULL) );
1245
1246                 if ( read_block( file, &ps, 0, REGF_BLOCKSIZE ) != -1 ) {
1247                         /* now use for writing */
1248                         prs_switch_type( &ps, MARSHALL );
1249
1250                         /* stream the block once, generate the checksum,
1251                            and stream it again */
1252                         prs_set_offset( &ps, 0 );
1253                         prs_regf_block( "regf_blocK", &ps, 0, file );
1254                         file->checksum = regf_block_checksum( &ps );
1255                         prs_set_offset( &ps, 0 );
1256                         prs_regf_block( "regf_blocK", &ps, 0, file );
1257
1258                         /* now we are ready to write it to disk */
1259                         if ( write_block( file, &ps, 0 ) == -1 )
1260                                 DEBUG(0,("regfio_close: failed to update the regf header block!\n"));
1261                 }
1262
1263                 prs_mem_free( &ps );
1264         }
1265
1266         regfio_mem_free( file );
1267
1268         /* nothing tdo do if there is no open file */
1269
1270         if ( !file || (file->fd == -1) )
1271                 return 0;
1272
1273         fd = file->fd;
1274         file->fd = -1;
1275         SAFE_FREE( file );
1276
1277         return close( fd );
1278 }
1279
1280 /*******************************************************************
1281 *******************************************************************/
1282
1283 static void regfio_flush( REGF_FILE *file )
1284 {
1285         REGF_HBIN *hbin;
1286
1287         for ( hbin=file->block_list; hbin; hbin=hbin->next ) {
1288                 write_hbin_block( file, hbin );
1289         }
1290 }
1291
1292 /*******************************************************************
1293  There should be only *one* root key in the registry file based
1294  on my experience.  --jerry
1295 *******************************************************************/
1296
1297 REGF_NK_REC* regfio_rootkey( REGF_FILE *file )
1298 {
1299         REGF_NK_REC *nk;
1300         REGF_HBIN   *hbin;
1301         uint32      offset = REGF_BLOCKSIZE;
1302         BOOL        found = False;
1303         BOOL        eob;
1304
1305         if ( !file )
1306                 return NULL;
1307
1308         if ( !(nk = TALLOC_ZERO_P( file->mem_ctx, REGF_NK_REC )) ) {
1309                 DEBUG(0,("regfio_rootkey: talloc() failed!\n"));
1310                 return NULL;
1311         }
1312
1313         /* scan through the file on HBIN block at a time looking
1314            for an NK record with a type == 0x002c.
1315            Normally this is the first nk record in the first hbin
1316            block (but I'm not assuming that for now) */
1317
1318         while ( (hbin = read_hbin_block( file, offset )) ) {
1319                 eob = False;
1320
1321                 while ( !eob) {
1322                         if ( next_nk_record( file, hbin, nk, &eob ) ) {
1323                                 if ( nk->key_type == NK_TYPE_ROOTKEY ) {
1324                                         found = True;
1325                                         break;
1326                                 }
1327                         }
1328                         prs_mem_free( &hbin->ps );
1329                 }
1330
1331                 if ( found )
1332                         break;
1333
1334                 offset += hbin->block_size;
1335         }
1336
1337         if ( !found ) {
1338                 DEBUG(0,("regfio_rootkey: corrupt registry file ?  No root key record located\n"));
1339                 return NULL;
1340         }
1341
1342         DLIST_ADD( file->block_list, hbin );
1343
1344         return nk;
1345 }
1346
1347 /*******************************************************************
1348  This acts as an interator over the subkeys defined for a given
1349  NK record.  Remember that offsets are from the *first* HBIN block.
1350 *******************************************************************/
1351
1352  REGF_NK_REC* regfio_fetch_subkey( REGF_FILE *file, REGF_NK_REC *nk )
1353 {
1354         REGF_NK_REC *subkey;
1355         REGF_HBIN   *hbin;
1356         uint32      nk_offset;
1357
1358         /* see if there is anything left to report */
1359
1360         if ( !nk || (nk->subkeys_off==REGF_OFFSET_NONE) || (nk->subkey_index >= nk->num_subkeys) )
1361                 return NULL;
1362
1363         /* find the HBIN block which should contain the nk record */
1364
1365         if ( !(hbin = lookup_hbin_block( file, nk->subkeys.hashes[nk->subkey_index].nk_off )) ) {
1366                 DEBUG(0,("hbin_prs_key: Failed to find HBIN block containing offset [0x%x]\n",
1367                         nk->subkeys.hashes[nk->subkey_index].nk_off));
1368                 return NULL;
1369         }
1370
1371         nk_offset = nk->subkeys.hashes[nk->subkey_index].nk_off;
1372         if ( !prs_set_offset( &hbin->ps, (HBIN_HDR_SIZE + nk_offset - hbin->first_hbin_off) ) )
1373                 return NULL;
1374
1375         nk->subkey_index++;
1376         if ( !(subkey = TALLOC_ZERO_P( file->mem_ctx, REGF_NK_REC )) )
1377                 return NULL;
1378
1379         if ( !hbin_prs_key( file, hbin, subkey ) )
1380                 return NULL;
1381
1382         return subkey;
1383 }
1384
1385
1386 /*******************************************************************
1387 *******************************************************************/
1388
1389 static REGF_HBIN* regf_hbin_allocate( REGF_FILE *file, uint32 block_size )
1390 {
1391         REGF_HBIN *hbin;
1392         SMB_STRUCT_STAT sbuf;
1393
1394         if ( !(hbin = TALLOC_ZERO_P( file->mem_ctx, REGF_HBIN )) )
1395                 return NULL;
1396
1397         memcpy( hbin->header, "hbin", sizeof(HBIN_HDR_SIZE) );
1398
1399
1400         if ( sys_fstat( file->fd, &sbuf ) ) {
1401                 DEBUG(0,("regf_hbin_allocate: stat() failed! (%s)\n", strerror(errno)));
1402                 return NULL;
1403         }
1404
1405         hbin->file_off       = sbuf.st_size;
1406
1407         hbin->free_off       = HBIN_HEADER_REC_SIZE;
1408         hbin->free_size      = block_size - hbin->free_off + sizeof(uint32);;
1409
1410         hbin->block_size     = block_size;
1411         hbin->first_hbin_off = hbin->file_off - REGF_BLOCKSIZE;
1412
1413         if ( !prs_init( &hbin->ps, block_size, file->mem_ctx, MARSHALL ) )
1414                 return NULL;
1415
1416         if ( !prs_hbin_block( "new_hbin", &hbin->ps, 0, hbin ) )
1417                 return NULL;
1418
1419         if ( !write_hbin_block( file, hbin ) )
1420                 return NULL;
1421
1422         file->last_block = hbin->file_off;
1423
1424         return hbin;
1425 }
1426
1427 /*******************************************************************
1428 *******************************************************************/
1429
1430 static void update_free_space( REGF_HBIN *hbin, uint32 size_used )
1431 {
1432         hbin->free_off  += size_used;
1433         hbin->free_size -= size_used;
1434
1435         if ( hbin->free_off >= hbin->block_size ) {
1436                 hbin->free_off = REGF_OFFSET_NONE;
1437         }
1438
1439         return;
1440 }
1441
1442 /*******************************************************************
1443 *******************************************************************/
1444
1445 static REGF_HBIN* find_free_space( REGF_FILE *file, uint32 size )
1446 {
1447         REGF_HBIN *hbin, *p_hbin;
1448         uint32 block_off;
1449         BOOL cached;
1450
1451         /* check open block list */
1452
1453         for ( hbin=file->block_list; hbin!=NULL; hbin=hbin->next ) {
1454                 /* only check blocks that actually have available space */
1455
1456                 if ( hbin->free_off == REGF_OFFSET_NONE )
1457                         continue;
1458
1459                 /* check for a large enough available chunk */
1460
1461                 if ( (hbin->block_size - hbin->free_off) >= size ) {
1462                         DLIST_PROMOTE( file->block_list, hbin );
1463                         goto done;
1464                 }
1465         }
1466
1467         /* parse the file until we find a block with
1468            enough free space; save the last non-filled hbin */
1469
1470         block_off = REGF_BLOCKSIZE;
1471         do {
1472                 /* cleanup before the next round */
1473                 cached = False;
1474                 if ( hbin )
1475                         prs_mem_free( &hbin->ps );
1476
1477                 hbin = read_hbin_block( file, block_off );
1478
1479                 if ( hbin ) {
1480
1481                         /* make sure that we don't already have this block in memory */
1482
1483                         for ( p_hbin=file->block_list; p_hbin!=NULL; p_hbin=p_hbin->next ) {
1484                                 if ( p_hbin->file_off == hbin->file_off ) {
1485                                         cached = True;
1486                                         break;
1487                                 }
1488                         }
1489
1490                         block_off = hbin->file_off + hbin->block_size;
1491
1492                         if ( cached ) {
1493                                 prs_mem_free( &hbin->ps );
1494                                 hbin = NULL;
1495                                 continue;
1496                         }
1497                 }
1498         /* if (cached block or (new block and not enough free space)) then continue looping */
1499         } while ( cached || (hbin && (hbin->free_size < size)) );
1500
1501         /* no free space; allocate a new one */
1502
1503         if ( !hbin ) {
1504                 uint32 alloc_size;
1505
1506                 /* allocate in multiples of REGF_ALLOC_BLOCK; make sure (size + hbin_header) fits */
1507
1508                 alloc_size = (((size+HBIN_HEADER_REC_SIZE) / REGF_ALLOC_BLOCK ) + 1 ) * REGF_ALLOC_BLOCK;
1509
1510                 if ( !(hbin = regf_hbin_allocate( file, alloc_size )) ) {
1511                         DEBUG(0,("find_free_space: regf_hbin_allocate() failed!\n"));
1512                         return NULL;
1513                 }
1514                 DLIST_ADD( file->block_list, hbin );
1515         }
1516
1517 done:
1518         /* set the offset to be ready to write */
1519
1520         if ( !prs_set_offset( &hbin->ps, hbin->free_off-sizeof(uint32) ) )
1521                 return NULL;
1522
1523         /* write the record size as a placeholder for now, it should be
1524            probably updated by the caller once it all of the data necessary
1525            for the record */
1526
1527         if ( !prs_uint32("allocated_size", &hbin->ps, 0, &size) )
1528                 return False;
1529
1530         update_free_space( hbin, size );
1531
1532         return hbin;
1533 }
1534
1535 /*******************************************************************
1536 *******************************************************************/
1537
1538 static uint32 sk_record_data_size( SEC_DESC * sd )
1539 {
1540         uint32 size, size_mod8;
1541
1542         size_mod8 = 0;
1543
1544         /* the record size is sizeof(hdr) + name + static members + data_size_field */
1545
1546         size = sizeof(uint32)*5 + sec_desc_size( sd ) + sizeof(uint32);
1547
1548         /* multiple of 8 */
1549         size_mod8 = size & 0xfffffff8;
1550         if ( size_mod8 < size )
1551                 size_mod8 += 8;
1552
1553         return size_mod8;
1554 }
1555
1556 /*******************************************************************
1557 *******************************************************************/
1558
1559 static uint32 vk_record_data_size( REGF_VK_REC *vk )
1560 {
1561         uint32 size, size_mod8;
1562
1563         size_mod8 = 0;
1564
1565         /* the record size is sizeof(hdr) + name + static members + data_size_field */
1566
1567         size = REC_HDR_SIZE + (sizeof(uint16)*3) + (sizeof(uint32)*3) + sizeof(uint32);
1568
1569         if ( vk->valuename )
1570                 size += strlen(vk->valuename);
1571
1572         /* multiple of 8 */
1573         size_mod8 = size & 0xfffffff8;
1574         if ( size_mod8 < size )
1575                 size_mod8 += 8;
1576
1577         return size_mod8;
1578 }
1579
1580 /*******************************************************************
1581 *******************************************************************/
1582
1583 static uint32 lf_record_data_size( uint32 num_keys )
1584 {
1585         uint32 size, size_mod8;
1586
1587         size_mod8 = 0;
1588
1589         /* the record size is sizeof(hdr) + num_keys + sizeof of hash_array + data_size_uint32 */
1590
1591         size = REC_HDR_SIZE + sizeof(uint16) + (sizeof(REGF_HASH_REC) * num_keys) + sizeof(uint32);
1592
1593         /* multiple of 8 */
1594         size_mod8 = size & 0xfffffff8;
1595         if ( size_mod8 < size )
1596                 size_mod8 += 8;
1597
1598         return size_mod8;
1599 }
1600
1601 /*******************************************************************
1602 *******************************************************************/
1603
1604 static uint32 nk_record_data_size( REGF_NK_REC *nk )
1605 {
1606         uint32 size, size_mod8;
1607
1608         size_mod8 = 0;
1609
1610         /* the record size is static + length_of_keyname + length_of_classname + data_size_uint32 */
1611
1612         size = 0x4c + strlen(nk->keyname) + sizeof(uint32);
1613
1614         if ( nk->classname )
1615                 size += strlen( nk->classname );
1616
1617         /* multiple of 8 */
1618         size_mod8 = size & 0xfffffff8;
1619         if ( size_mod8 < size )
1620                 size_mod8 += 8;
1621
1622         return size_mod8;
1623 }
1624
1625 /*******************************************************************
1626 *******************************************************************/
1627
1628 static BOOL create_vk_record( REGF_FILE *file, REGF_VK_REC *vk, REGISTRY_VALUE *value )
1629 {
1630         char *name = regval_name(value);
1631         REGF_HBIN *data_hbin;
1632
1633         ZERO_STRUCTP( vk );
1634
1635         memcpy( vk->header, "vk", REC_HDR_SIZE );
1636
1637         if ( name ) {
1638                 vk->valuename = talloc_strdup( file->mem_ctx, regval_name(value) );
1639                 vk->flag = VK_FLAG_NAME_PRESENT;
1640         }
1641
1642         vk->data_size = regval_size( value );
1643         vk->type      = regval_type( value );
1644
1645         if ( vk->data_size > sizeof(uint32) ) {
1646                 uint32 data_size = ( (vk->data_size+sizeof(uint32)) & 0xfffffff8 ) + 8;
1647
1648                 vk->data = TALLOC_MEMDUP( file->mem_ctx, regval_data_p(value), vk->data_size );
1649
1650                 /* go ahead and store the offset....we'll pick this hbin block back up when
1651                    we stream the data */
1652
1653                 data_hbin = find_free_space(file, data_size );
1654                 vk->data_off = prs_offset( &data_hbin->ps ) + data_hbin->first_hbin_off - HBIN_HDR_SIZE;
1655         }
1656         else {
1657                 /* make sure we don't try to copy from a NULL value pointer */
1658
1659                 if ( vk->data_size != 0 )
1660                         memcpy( &vk->data_off, regval_data_p(value), sizeof(uint32) );
1661                 vk->data_size |= VK_DATA_IN_OFFSET;
1662         }
1663
1664         return True;
1665 }
1666
1667 /*******************************************************************
1668 *******************************************************************/
1669
1670 static int hashrec_cmp( REGF_HASH_REC *h1, REGF_HASH_REC *h2 )
1671 {
1672         return StrnCaseCmp( h1->keycheck, h2->keycheck, sizeof(uint32) );
1673 }
1674
1675 /*******************************************************************
1676 *******************************************************************/
1677
1678  REGF_NK_REC* regfio_write_key( REGF_FILE *file, const char *name,
1679                                REGVAL_CTR *values, REGSUBKEY_CTR *subkeys,
1680                                SEC_DESC *sec_desc, REGF_NK_REC *parent )
1681 {
1682         REGF_NK_REC *nk;
1683         REGF_HBIN *vlist_hbin = NULL;
1684         uint32 size;
1685
1686         if ( !(nk = TALLOC_ZERO_P( file->mem_ctx, REGF_NK_REC )) )
1687                 return NULL;
1688
1689         memcpy( nk->header, "nk", REC_HDR_SIZE );
1690
1691         if ( !parent )
1692                 nk->key_type = NK_TYPE_ROOTKEY;
1693         else
1694                 nk->key_type = NK_TYPE_NORMALKEY;
1695
1696         /* store the parent offset (or -1 if a the root key */
1697
1698         nk->parent_off = parent ? (parent->hbin_off + parent->hbin->file_off - REGF_BLOCKSIZE - HBIN_HDR_SIZE ) : REGF_OFFSET_NONE;
1699
1700         /* no classname currently */
1701
1702         nk->classname_off = REGF_OFFSET_NONE;
1703         nk->classname = NULL;
1704         nk->keyname = talloc_strdup( file->mem_ctx, name );
1705
1706         /* current modification time */
1707
1708         unix_to_nt_time( &nk->mtime, time(NULL) );
1709
1710         /* allocate the record on disk */
1711
1712         size = nk_record_data_size( nk );
1713         nk->rec_size = ( size - 1 ) ^ 0XFFFFFFFF;
1714         nk->hbin = find_free_space( file, size );
1715         nk->hbin_off = prs_offset( &nk->hbin->ps );
1716
1717         /* Update the hash record in the parent */
1718
1719         if ( parent ) {
1720                 REGF_HASH_REC *hash = &parent->subkeys.hashes[parent->subkey_index];
1721
1722                 hash->nk_off = prs_offset( &nk->hbin->ps ) + nk->hbin->first_hbin_off - HBIN_HDR_SIZE;
1723                 memcpy( hash->keycheck, name, sizeof(uint32) );
1724                 parent->subkey_index++;
1725
1726                 /* sort the list by keyname */
1727
1728                 qsort( parent->subkeys.hashes, parent->subkey_index, sizeof(REGF_HASH_REC), QSORT_CAST hashrec_cmp );
1729
1730                 if ( !hbin_prs_lf_records( "lf_rec", parent->subkeys.hbin, 0, parent ) )
1731                         return False;
1732         }
1733
1734         /* write the security descriptor */
1735
1736         nk->sk_off = REGF_OFFSET_NONE;
1737         if ( sec_desc ) {
1738                 uint32 sk_size = sk_record_data_size( sec_desc );
1739                 REGF_HBIN *sk_hbin;
1740                 REGF_SK_REC *tmp = NULL;
1741
1742                 /* search for it in the existing list of sd's */
1743
1744                 if ( (nk->sec_desc = find_sk_record_by_sec_desc( file, sec_desc )) == NULL ) {
1745                         /* not found so add it to the list */
1746
1747                         sk_hbin = find_free_space( file, sk_size );
1748
1749                         if ( !(nk->sec_desc = TALLOC_ZERO_P( file->mem_ctx, REGF_SK_REC )) )
1750                                 return NULL;
1751
1752                         /* now we have to store the security descriptor in the list and
1753                            update the offsets */
1754
1755                         memcpy( nk->sec_desc->header, "sk", REC_HDR_SIZE );
1756                         nk->sec_desc->hbin      = sk_hbin;
1757                         nk->sec_desc->hbin_off  = prs_offset( &sk_hbin->ps );
1758                         nk->sec_desc->sk_off    = prs_offset( &sk_hbin->ps ) + sk_hbin->first_hbin_off - HBIN_HDR_SIZE;
1759                         nk->sec_desc->rec_size  = (sk_size-1)  ^ 0xFFFFFFFF;
1760
1761                         nk->sec_desc->sec_desc  = sec_desc;
1762                         nk->sec_desc->ref_count = 0;
1763
1764                         /* size value must be self-inclusive */
1765                         nk->sec_desc->size      = sec_desc_size(sec_desc) + sizeof(uint32);
1766
1767                         DLIST_ADD_END( file->sec_desc_list, nk->sec_desc, tmp );
1768
1769                         /* initialize offsets */
1770
1771                         nk->sec_desc->prev_sk_off = nk->sec_desc->sk_off;
1772                         nk->sec_desc->next_sk_off = nk->sec_desc->sk_off;
1773
1774                         /* now update the offsets for us and the previous sd in the list */
1775
1776                         if ( nk->sec_desc->prev ) {
1777                                 REGF_SK_REC *prev = nk->sec_desc->prev;
1778
1779                                 nk->sec_desc->prev_sk_off = prev->hbin_off + prev->hbin->first_hbin_off - HBIN_HDR_SIZE;
1780                                 prev->next_sk_off = nk->sk_off;
1781                         }
1782                 }
1783
1784                 /* dump the reference count */
1785
1786                 nk->sk_off = nk->sec_desc->sk_off;
1787                 nk->sec_desc->ref_count++;
1788         }
1789
1790         /* write the subkeys */
1791
1792         nk->subkeys_off = REGF_OFFSET_NONE;
1793         if ( (nk->num_subkeys = regsubkey_ctr_numkeys( subkeys )) != 0 ) {
1794                 uint32 lf_size = lf_record_data_size( nk->num_subkeys );
1795                 uint32 namelen;
1796                 int i;
1797
1798                 nk->subkeys.hbin = find_free_space( file, lf_size );
1799                 nk->subkeys.hbin_off = prs_offset( &nk->subkeys.hbin->ps );
1800                 nk->subkeys.rec_size = (lf_size-1) ^ 0xFFFFFFFF;
1801                 nk->subkeys_off = prs_offset( &nk->subkeys.hbin->ps ) + nk->subkeys.hbin->first_hbin_off - HBIN_HDR_SIZE;
1802
1803                 memcpy( nk->subkeys.header, "lf", REC_HDR_SIZE );
1804
1805                 nk->subkeys.num_keys = nk->num_subkeys;
1806                 if ( !(nk->subkeys.hashes = TALLOC_ZERO_ARRAY( file->mem_ctx, REGF_HASH_REC, nk->subkeys.num_keys )) )
1807                         return NULL;
1808                 nk->subkey_index = 0;
1809
1810                 /* update the max_bytes_subkey{name,classname} fields */
1811                 for ( i=0; i<nk->num_subkeys; i++ ) {
1812                         namelen = strlen( regsubkey_ctr_specific_key(subkeys, i) );
1813                         if ( namelen*2 > nk->max_bytes_subkeyname )
1814                                 nk->max_bytes_subkeyname = namelen * 2;
1815                 }
1816         }
1817
1818         /* write the values */
1819
1820         nk->values_off = REGF_OFFSET_NONE;
1821         if ( (nk->num_values = regval_ctr_numvals( values )) != 0 ) {
1822                 uint32 vlist_size = ( ( nk->num_values * sizeof(uint32) ) & 0xfffffff8 ) + 8;
1823                 int i;
1824
1825                 vlist_hbin = find_free_space( file, vlist_size );
1826                 nk->values_off = prs_offset( &vlist_hbin->ps ) + vlist_hbin->first_hbin_off - HBIN_HDR_SIZE;
1827
1828                 if ( !(nk->values = TALLOC_ARRAY( file->mem_ctx, REGF_VK_REC, nk->num_values )) )
1829                         return NULL;
1830
1831                 /* create the vk records */
1832
1833                 for ( i=0; i<nk->num_values; i++ ) {
1834                         uint32 vk_size, namelen, datalen;
1835                         REGISTRY_VALUE *r;
1836
1837                         r = regval_ctr_specific_value( values, i );
1838                         create_vk_record( file, &nk->values[i], r );
1839                         vk_size = vk_record_data_size( &nk->values[i] );
1840                         nk->values[i].hbin = find_free_space( file, vk_size );
1841                         nk->values[i].hbin_off = prs_offset( &nk->values[i].hbin->ps );
1842                         nk->values[i].rec_size = ( vk_size - 1 ) ^ 0xFFFFFFFF;
1843                         nk->values[i].rec_off = prs_offset( &nk->values[i].hbin->ps )
1844                                 + nk->values[i].hbin->first_hbin_off
1845                                 - HBIN_HDR_SIZE;
1846
1847                         /* update the max bytes fields if necessary */
1848
1849                         namelen = strlen( regval_name(r) );
1850                         if ( namelen*2 > nk->max_bytes_valuename )
1851                                 nk->max_bytes_valuename = namelen * 2;
1852
1853                         datalen = regval_size( r );
1854                         if ( datalen*2 > nk->max_bytes_value )
1855                                 nk->max_bytes_value = datalen * 2;
1856                 }
1857         }
1858
1859         /* stream the records */
1860
1861         prs_set_offset( &nk->hbin->ps, nk->hbin_off );
1862         if ( !prs_nk_rec( "nk_rec", &nk->hbin->ps, 0, nk ) )
1863                 return False;
1864
1865         if ( nk->num_values ) {
1866                 if ( !hbin_prs_vk_records( "vk_records", vlist_hbin, 0, nk, file ) )
1867                         return False;
1868         }
1869
1870
1871         regfio_flush( file );
1872
1873         return nk;
1874 }
1875