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                 uint8 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         curr_off = prs_offset( &hbin->ps );
 482         while ( header != 0xffffffff ) {
 483                 /* not done yet so reset the current offset to the
 484                    next record_size field */
 485
 486                 curr_off = curr_off+record_size;
 487
 488                 /* for some reason the record_size of the last record in
 489                    an hbin block can extend past the end of the block
 490                    even though the record fits within the remaining
 491                    space....aaarrrgggghhhhhh */
 492
 493                 if ( curr_off >= block_size ) {
 494                         record_size = -1;
 495                         curr_off = -1;
 496                         break;
 497                 }
 498
 499                 if ( !prs_set_offset( &hbin->ps, curr_off) )
 500                         return False;
 501
 502                 if ( !prs_uint32( "rec_size", &hbin->ps, 0, &record_size ) )
 503                         return False;
 504                 if ( !prs_uint32( "header", &hbin->ps, 0, &header ) )
 505                         return False;
 506
 507                 SMB_ASSERT( record_size != 0 );
 508
 509                 if ( record_size & 0x80000000 ) {
 510                         /* absolute_value(record_size) */
 511                         record_size = (record_size ^ 0xffffffff) + 1;
 512                 }
 513         }
 514
 515         /* save the free space offset */
 516
 517         if ( header == 0xffffffff ) {
 518
 519                 /* account for the fact that the curr_off is 4 bytes behind the actual
 520                    record header */
 521
 522                 hbin->free_off = curr_off + sizeof(uint32);
 523                 hbin->free_size = record_size;
 524         }
 525
 526         DEBUG(10,("read_hbin_block: free space offset == 0x%x\n", hbin->free_off));
 527
 528         if ( !prs_set_offset( &hbin->ps, file->data_offset+HBIN_HDR_SIZE )  )
 529                 return False;
 530
 531         return hbin;
 532 }
 533
 534 /*******************************************************************
 535  Input a randon offset and receive the correpsonding HBIN
 536  block for it
 537 *******************************************************************/
 538
 539 static BOOL hbin_contains_offset( REGF_HBIN *hbin, uint32 offset )
 540 {
 541         if ( !hbin )
 542                 return False;
 543
 544         if ( (offset > hbin->first_hbin_off) && (offset < (hbin->first_hbin_off+hbin->block_size)) )
 545                 return True;
 546
 547         return False;
 548 }
 549
 550 /*******************************************************************
 551  Input a randon offset and receive the correpsonding HBIN
 552  block for it
 553 *******************************************************************/
 554
 555 static REGF_HBIN* lookup_hbin_block( REGF_FILE *file, uint32 offset )
 556 {
 557         REGF_HBIN *hbin = NULL;
 558         uint32 block_off;
 559
 560         /* start with the open list */
 561
 562         for ( hbin=file->block_list; hbin; hbin=hbin->next ) {
 563                 DEBUG(10,("lookup_hbin_block: address = 0x%x [0x%x]\n", hbin->file_off, (uint32)hbin ));
 564                 if ( hbin_contains_offset( hbin, offset ) )
 565                         return hbin;
 566         }
 567
 568         if ( !hbin ) {
 569                 /* start at the beginning */
 570
 571                 block_off = REGF_BLOCKSIZE;
 572                 do {
 573                         /* cleanup before the next round */
 574                         if ( hbin )
 575                                 prs_mem_free( &hbin->ps );
 576
 577                         hbin = read_hbin_block( file, block_off );
 578
 579                         if ( hbin )
 580                                 block_off = hbin->file_off + hbin->block_size;
 581
 582                 } while ( hbin && !hbin_contains_offset( hbin, offset ) );
 583         }
 584
 585         if ( hbin )
 586                 DLIST_ADD( file->block_list, hbin );
 587
 588         return hbin;
 589 }
 590
 591 /*******************************************************************
 592 *******************************************************************/
 593
 594 static BOOL prs_hash_rec( const char *desc, prs_struct *ps, int depth, REGF_HASH_REC *hash )
 595 {
 596         prs_debug(ps, depth, desc, "prs_hash_rec");
 597         depth++;
 598
 599         if ( !prs_uint32( "nk_off", ps, depth, &hash->nk_off ))
 600                 return False;
 601         if ( !prs_uint8s( True, "keycheck", ps, depth, hash->keycheck, sizeof( hash->keycheck )) )
 602                 return False;
 603
 604         return True;
 605 }
 606
 607 /*******************************************************************
 608 *******************************************************************/
 609
 610 static BOOL hbin_prs_lf_records( const char *desc, REGF_HBIN *hbin, int depth, REGF_NK_REC *nk )
 611 {
 612         int i;
 613         REGF_LF_REC *lf = &nk->subkeys;
 614         uint32 data_size, start_off, end_off;
 615
 616         prs_debug(&hbin->ps, depth, desc, "prs_lf_records");
 617         depth++;
 618
 619         /* check if we have anything to do first */
 620
 621         if ( nk->num_subkeys == 0 )
 622                 return True;
 623
 624         /* move to the LF record */
 625
 626         if ( !prs_set_offset( &hbin->ps, nk->subkeys_off + HBIN_HDR_SIZE - hbin->first_hbin_off ) )
 627                 return False;
 628
 629         /* backup and get the data_size */
 630
 631         if ( !prs_set_offset( &hbin->ps, prs_offset(&hbin->ps)-sizeof(uint32)) )
 632                 return False;
 633         start_off = prs_offset( &hbin->ps );
 634         if ( !prs_uint32( "rec_size", &hbin->ps, depth, &lf->rec_size ))
 635                 return False;
 636
 637         if ( !prs_uint8s( True, "header", &hbin->ps, depth, lf->header, sizeof( lf->header )) )
 638                 return False;
 639
 640         if ( !prs_uint16( "num_keys", &hbin->ps, depth, &lf->num_keys))
 641                 return False;
 642
 643         if ( UNMARSHALLING(&hbin->ps) ) {
 644                 if ( !(lf->hashes = PRS_ALLOC_MEM( &hbin->ps, REGF_HASH_REC, lf->num_keys )) )
 645                         return False;
 646         }
 647
 648         for ( i=0; i<lf->num_keys; i++ ) {
 649                 if ( !prs_hash_rec( "hash_rec", &hbin->ps, depth, &lf->hashes[i] ) )
 650                         return False;
 651         }
 652
 653         end_off = prs_offset( &hbin->ps );
 654
 655         /* data_size must be divisible by 8 and large enough to hold the original record */
 656
 657         data_size = ((start_off - end_off) & 0xfffffff8 );
 658         if ( data_size > lf->rec_size )
 659                 DEBUG(10,("Encountered reused record (0x%x < 0x%x)\n", data_size, lf->rec_size));
 660
 661         if ( MARSHALLING(&hbin->ps) )
 662                 hbin->dirty = True;
 663
 664         return True;
 665 }
 666
 667 /*******************************************************************
 668 *******************************************************************/
 669
 670 static BOOL hbin_prs_sk_rec( const char *desc, REGF_HBIN *hbin, int depth, REGF_SK_REC *sk )
 671 {
 672         prs_struct *ps = &hbin->ps;
 673         uint16 tag = 0xFFFF;
 674         uint32 data_size, start_off, end_off;
 675
 676
 677         prs_debug(ps, depth, desc, "hbin_prs_sk_rec");
 678         depth++;
 679
 680         if ( !prs_set_offset( &hbin->ps, sk->sk_off + HBIN_HDR_SIZE - hbin->first_hbin_off ) )
 681                 return False;
 682
 683         /* backup and get the data_size */
 684
 685         if ( !prs_set_offset( &hbin->ps, prs_offset(&hbin->ps)-sizeof(uint32)) )
 686                 return False;
 687         start_off = prs_offset( &hbin->ps );
 688         if ( !prs_uint32( "rec_size", &hbin->ps, depth, &sk->rec_size ))
 689                 return False;
 690
 691         if ( !prs_uint8s( True, "header", ps, depth, sk->header, sizeof( sk->header )) )
 692                 return False;
 693         if ( !prs_uint16( "tag", ps, depth, &tag))
 694                 return False;
 695
 696         if ( !prs_uint32( "prev_sk_off", ps, depth, &sk->prev_sk_off))
 697                 return False;
 698         if ( !prs_uint32( "next_sk_off", ps, depth, &sk->next_sk_off))
 699                 return False;
 700         if ( !prs_uint32( "ref_count", ps, depth, &sk->ref_count))
 701                 return False;
 702         if ( !prs_uint32( "size", ps, depth, &sk->size))
 703                 return False;
 704
 705         if ( !sec_io_desc( "sec_desc", &sk->sec_desc, ps, depth ))
 706                 return False;
 707
 708         end_off = prs_offset( &hbin->ps );
 709
 710         /* data_size must be divisible by 8 and large enough to hold the original record */
 711
 712         data_size = ((start_off - end_off) & 0xfffffff8 );
 713         if ( data_size > sk->rec_size )
 714                 DEBUG(10,("Encountered reused record (0x%x < 0x%x)\n", data_size, sk->rec_size));
 715
 716         if ( MARSHALLING(&hbin->ps) )
 717                 hbin->dirty = True;
 718
 719         return True;
 720 }
 721
 722 /*******************************************************************
 723 *******************************************************************/
 724
 725 static BOOL hbin_prs_vk_rec( const char *desc, REGF_HBIN *hbin, int depth, REGF_VK_REC *vk, REGF_FILE *file )
 726 {
 727         uint32 offset;
 728         uint16 name_length;
 729         prs_struct *ps = &hbin->ps;
 730         uint32 data_size, start_off, end_off;
 731
 732         prs_debug(ps, depth, desc, "prs_vk_rec");
 733         depth++;
 734
 735         /* backup and get the data_size */
 736
 737         if ( !prs_set_offset( &hbin->ps, prs_offset(&hbin->ps)-sizeof(uint32)) )
 738                 return False;
 739         start_off = prs_offset( &hbin->ps );
 740         if ( !prs_uint32( "rec_size", &hbin->ps, depth, &vk->rec_size ))
 741                 return False;
 742
 743         if ( !prs_uint8s( True, "header", ps, depth, vk->header, sizeof( vk->header )) )
 744                 return False;
 745
 746         if ( MARSHALLING(&hbin->ps) )
 747                 name_length = strlen(vk->valuename);
 748
 749         if ( !prs_uint16( "name_length", ps, depth, &name_length ))
 750                 return False;
 751         if ( !prs_uint32( "data_size", ps, depth, &vk->data_size ))
 752                 return False;
 753         if ( !prs_uint32( "data_off", ps, depth, &vk->data_off ))
 754                 return False;
 755         if ( !prs_uint32( "type", ps, depth, &vk->type))
 756                 return False;
 757         if ( !prs_uint16( "flag", ps, depth, &vk->flag))
 758                 return False;
 759
 760         offset = prs_offset( ps );
 761         offset += 2;    /* skip 2 bytes */
 762         prs_set_offset( ps, offset );
 763
 764         /* get the name */
 765
 766         if ( vk->flag&VK_FLAG_NAME_PRESENT ) {
 767
 768                 if ( UNMARSHALLING(&hbin->ps) ) {
 769                         if ( !(vk->valuename = PRS_ALLOC_MEM( ps, char, name_length+1 )))
 770                                 return False;
 771                 }
 772                 if ( !prs_uint8s( True, "name", ps, depth, vk->valuename, name_length ) )
 773                         return False;
 774         }
 775
 776         end_off = prs_offset( &hbin->ps );
 777
 778         /* get the data if necessary */
 779
 780         if ( vk->data_size != 0 ) {
 781                 BOOL charmode = False;
 782
 783                 if ( (vk->type == REG_SZ) || (vk->type == REG_MULTI_SZ) )
 784                         charmode = True;
 785
 786                 /* the data is stored in the offset if the size <= 4 */
 787
 788                 if ( !(vk->data_size & VK_DATA_IN_OFFSET) ) {
 789                         REGF_HBIN *hblock = hbin;
 790                         uint32 data_rec_size;
 791
 792                         if ( UNMARSHALLING(&hbin->ps) ) {
 793                                 if ( !(vk->data = PRS_ALLOC_MEM( ps, uint8, vk->data_size) ) )
 794                                         return False;
 795                         }
 796
 797                         /* this data can be in another hbin */
 798                         if ( !hbin_contains_offset( hbin, vk->data_off ) ) {
 799                                 if ( !(hblock = lookup_hbin_block( file, vk->data_off )) )
 800                                         return False;
 801                         }
 802                         if ( !(prs_set_offset( &hblock->ps, (vk->data_off+HBIN_HDR_SIZE-hblock->first_hbin_off)-sizeof(uint32) )) )
 803                                 return False;
 804
 805                         if ( MARSHALLING(&hblock->ps) ) {
 806                                 data_rec_size = ( (vk->data_size+sizeof(uint32)) & 0xfffffff8 ) + 8;
 807                                 data_rec_size = ( data_rec_size - 1 ) ^ 0xFFFFFFFF;
 808                         }
 809                         if ( !prs_uint32( "data_rec_size", &hblock->ps, depth, &data_rec_size ))
 810                                 return False;
 811                         if ( !prs_uint8s( charmode, "data", &hblock->ps, depth, vk->data, vk->data_size) )
 812                                 return False;
 813
 814                         if ( MARSHALLING(&hblock->ps) )
 815                                 hblock->dirty = True;
 816                 }
 817                 else {
 818                         if ( !(vk->data = PRS_ALLOC_MEM( ps, uint8, 4 ) ) )
 819                                 return False;
 820                         SIVAL( vk->data, 0, vk->data_off );
 821                 }
 822
 823         }
 824
 825         /* data_size must be divisible by 8 and large enough to hold the original record */
 826
 827         data_size = ((start_off - end_off ) & 0xfffffff8 );
 828         if ( data_size !=  vk->rec_size )
 829                 DEBUG(10,("prs_vk_rec: data_size check failed (0x%x < 0x%x)\n", data_size, vk->rec_size));
 830
 831         if ( MARSHALLING(&hbin->ps) )
 832                 hbin->dirty = True;
 833
 834         return True;
 835 }
 836
 837 /*******************************************************************
 838  read a VK record which is contained in the HBIN block stored
 839  in the prs_struct *ps.
 840 *******************************************************************/
 841
 842 static BOOL hbin_prs_vk_records( const char *desc, REGF_HBIN *hbin, int depth, REGF_NK_REC *nk, REGF_FILE *file )
 843 {
 844         int i;
 845         uint32 record_size;
 846
 847         prs_debug(&hbin->ps, depth, desc, "prs_vk_records");
 848         depth++;
 849
 850         /* check if we have anything to do first */
 851
 852         if ( nk->num_values == 0 )
 853                 return True;
 854
 855         if ( UNMARSHALLING(&hbin->ps) ) {
 856                 if ( !(nk->values = PRS_ALLOC_MEM( &hbin->ps, REGF_VK_REC, nk->num_values ) ) )
 857                         return False;
 858         }
 859
 860         /* convert the offset to something relative to this HBIN block */
 861
 862         if ( !prs_set_offset( &hbin->ps, nk->values_off+HBIN_HDR_SIZE-hbin->first_hbin_off-sizeof(uint32)) )
 863                 return False;
 864
 865         if ( MARSHALLING( &hbin->ps) ) {
 866                 record_size = ( ( nk->num_values * sizeof(uint32) ) & 0xfffffff8 ) + 8;
 867                 record_size = (record_size - 1) ^ 0xFFFFFFFF;
 868         }
 869
 870         if ( !prs_uint32( "record_size", &hbin->ps, depth, &record_size ) )
 871                 return False;
 872
 873         for ( i=0; i<nk->num_values; i++ ) {
 874                 if ( !prs_uint32( "vk_off", &hbin->ps, depth, &nk->values[i].rec_off ) )
 875                         return False;
 876         }
 877
 878         for ( i=0; i<nk->num_values; i++ ) {
 879                 REGF_HBIN *sub_hbin = hbin;
 880                 uint32 new_offset;
 881
 882                 if ( !hbin_contains_offset( hbin, nk->values[i].rec_off ) ) {
 883                         sub_hbin = lookup_hbin_block( file, nk->values[i].rec_off );
 884                         if ( !sub_hbin ) {
 885                                 DEBUG(0,("hbin_prs_vk_records: Failed to find HBIN block containing offset [0x%x]\n",
 886                                         nk->values[i].hbin_off));
 887                                 return False;
 888                         }
 889                 }
 890
 891                 new_offset = nk->values[i].rec_off + HBIN_HDR_SIZE - sub_hbin->first_hbin_off;
 892                 if ( !prs_set_offset( &sub_hbin->ps, new_offset ) )
 893                         return False;
 894                 if ( !hbin_prs_vk_rec( "vk_rec", sub_hbin, depth, &nk->values[i], file ) )
 895                         return False;
 896         }
 897
 898         if ( MARSHALLING(&hbin->ps) )
 899                 hbin->dirty = True;
 900
 901
 902         return True;
 903 }
 904
 905
 906 /*******************************************************************
 907 *******************************************************************/
 908
 909 static REGF_SK_REC* find_sk_record_by_offset( REGF_FILE *file, uint32 offset )
 910 {
 911         REGF_SK_REC *p_sk;
 912
 913         for ( p_sk=file->sec_desc_list; p_sk; p_sk=p_sk->next ) {
 914                 if ( p_sk->sk_off == offset )
 915                         return p_sk;
 916         }
 917
 918         return NULL;
 919 }
 920
 921 /*******************************************************************
 922 *******************************************************************/
 923
 924 static REGF_SK_REC* find_sk_record_by_sec_desc( REGF_FILE *file, SEC_DESC *sd )
 925 {
 926         REGF_SK_REC *p;
 927
 928         for ( p=file->sec_desc_list; p; p=p->next ) {
 929                 if ( sec_desc_equal( p->sec_desc, sd ) )
 930                         return p;
 931         }
 932
 933         /* failure */
 934
 935         return NULL;
 936 }
 937
 938 /*******************************************************************
 939 *******************************************************************/
 940
 941 static BOOL hbin_prs_key( REGF_FILE *file, REGF_HBIN *hbin, REGF_NK_REC *nk )
 942 {
 943         int depth = 0;
 944         REGF_HBIN *sub_hbin;
 945
 946         prs_debug(&hbin->ps, depth, "", "fetch_key");
 947         depth++;
 948
 949         /* get the initial nk record */
 950
 951         if ( !prs_nk_rec( "nk_rec", &hbin->ps, depth, nk ))
 952                 return False;
 953
 954         /* fill in values */
 955
 956         if ( nk->num_values && (nk->values_off!=REGF_OFFSET_NONE) ) {
 957                 sub_hbin = hbin;
 958                 if ( !hbin_contains_offset( hbin, nk->values_off ) ) {
 959                         sub_hbin = lookup_hbin_block( file, nk->values_off );
 960                         if ( !sub_hbin ) {
 961                                 DEBUG(0,("hbin_prs_key: Failed to find HBIN block containing value_list_offset [0x%x]\n",
 962                                         nk->values_off));
 963                                 return False;
 964                         }
 965                 }
 966
 967                 if ( !hbin_prs_vk_records( "vk_rec", sub_hbin, depth, nk, file ))
 968                         return False;
 969         }
 970
 971         /* now get subkeys */
 972
 973         if ( nk->num_subkeys && (nk->subkeys_off!=REGF_OFFSET_NONE) ) {
 974                 sub_hbin = hbin;
 975                 if ( !hbin_contains_offset( hbin, nk->subkeys_off ) ) {
 976                         sub_hbin = lookup_hbin_block( file, nk->subkeys_off );
 977                         if ( !sub_hbin ) {
 978                                 DEBUG(0,("hbin_prs_key: Failed to find HBIN block containing subkey_offset [0x%x]\n",
 979                                         nk->subkeys_off));
 980                                 return False;
 981                         }
 982                 }
 983
 984                 if ( !hbin_prs_lf_records( "lf_rec", sub_hbin, depth, nk ))
 985                         return False;
 986         }
 987
 988         /* get the to the security descriptor.  First look if we have already parsed it */
 989
 990         if ( (nk->sk_off!=REGF_OFFSET_NONE) && !( nk->sec_desc = find_sk_record_by_offset( file, nk->sk_off )) ) {
 991
 992                 sub_hbin = hbin;
 993                 if ( !hbin_contains_offset( hbin, nk->sk_off ) ) {
 994                         sub_hbin = lookup_hbin_block( file, nk->sk_off );
 995                         if ( !sub_hbin ) {
 996                                 DEBUG(0,("hbin_prs_key: Failed to find HBIN block containing sk_offset [0x%x]\n",
 997                                         nk->subkeys_off));
 998                                 return False;
 999                         }
1000                 }
1001
1002                 if ( !(nk->sec_desc = TALLOC_ZERO_P( file->mem_ctx, REGF_SK_REC )) )
1003                         return False;
1004                 nk->sec_desc->sk_off = nk->sk_off;
1005                 if ( !hbin_prs_sk_rec( "sk_rec", sub_hbin, depth, nk->sec_desc ))
1006                         return False;
1007
1008                 /* add to the list of security descriptors (ref_count has been read from the files) */
1009
1010                 nk->sec_desc->sk_off = nk->sk_off;
1011                 DLIST_ADD( file->sec_desc_list, nk->sec_desc );
1012         }
1013
1014         return True;
1015 }
1016
1017 /*******************************************************************
1018 *******************************************************************/
1019
1020 static BOOL next_record( REGF_HBIN *hbin, const char *hdr, BOOL *eob )
1021 {
1022         char header[REC_HDR_SIZE] = "";
1023         uint32 record_size;
1024         uint32 curr_off, block_size;
1025         BOOL found = False;
1026         prs_struct *ps = &hbin->ps;
1027
1028         curr_off = prs_offset( ps );
1029         if ( curr_off == 0 )
1030                 prs_set_offset( ps, HBIN_HEADER_REC_SIZE );
1031
1032         /* assume that the current offset is at the reacord header
1033            and we need to backup to read the record size */
1034
1035         curr_off -= sizeof(uint32);
1036
1037         block_size = prs_data_size( ps );
1038         record_size = 0;
1039         while ( !found ) {
1040
1041                 curr_off = curr_off+record_size;
1042                 if ( curr_off >= block_size )
1043                         break;
1044
1045                 if ( !prs_set_offset( &hbin->ps, curr_off) )
1046                         return False;
1047
1048                 if ( !prs_uint32( "record_size", ps, 0, &record_size ) )
1049                         return False;
1050                 if ( !prs_uint8s( True, "header", ps, 0, header, REC_HDR_SIZE ) )
1051                         return False;
1052
1053                 if ( record_size & 0x80000000 ) {
1054                         /* absolute_value(record_size) */
1055                         record_size = (record_size ^ 0xffffffff) + 1;
1056                 }
1057
1058                 if ( memcmp( header, hdr, REC_HDR_SIZE ) == 0 ) {
1059                         found = True;
1060                         curr_off += sizeof(uint32);
1061                 }
1062         }
1063
1064         /* mark prs_struct as done ( at end ) if no more SK records */
1065         /* mark end-of-block as True */
1066
1067         if ( !found ) {
1068                 prs_set_offset( &hbin->ps, prs_data_size(&hbin->ps) );
1069                 *eob = True;
1070                 return False;
1071         }
1072
1073         if ( !prs_set_offset( ps, curr_off ) )
1074                 return False;
1075
1076         return True;
1077 }
1078
1079 /*******************************************************************
1080 *******************************************************************/
1081
1082 static BOOL next_nk_record( REGF_FILE *file, REGF_HBIN *hbin, REGF_NK_REC *nk, BOOL *eob )
1083 {
1084         if ( next_record( hbin, "nk", eob ) && hbin_prs_key( file, hbin, nk ) )
1085                 return True;
1086
1087         return False;
1088 }
1089
1090 /*******************************************************************
1091  Intialize the newly created REGF_BLOCK in *file and write the
1092  block header to disk
1093 *******************************************************************/
1094
1095 static BOOL init_regf_block( REGF_FILE *file )
1096 {
1097         prs_struct ps;
1098         BOOL result = True;
1099
1100         if ( !prs_init( &ps, REGF_BLOCKSIZE, file->mem_ctx, MARSHALL ) )
1101                 return False;
1102
1103         memcpy( file->header, "regf", REGF_HDR_SIZE );
1104         file->data_offset = 0x20;
1105         file->last_block  = 0x1000;
1106
1107         /* set mod time */
1108
1109         unix_to_nt_time( &file->mtime, time(NULL) );
1110
1111         /* hard coded values...no diea what these are ... maybe in time */
1112
1113         file->unknown1 = 0x2;
1114         file->unknown2 = 0x1;
1115         file->unknown3 = 0x3;
1116         file->unknown4 = 0x0;
1117         file->unknown5 = 0x1;
1118         file->unknown6 = 0x1;
1119
1120         /* write header to the buffer */
1121
1122         if ( !prs_regf_block( "regf_header", &ps, 0, file ) ) {
1123                 result = False;
1124                 goto out;
1125         }
1126
1127         /* calculate the checksum, re-marshall data (to include the checksum)
1128            and write to disk */
1129
1130         file->checksum = regf_block_checksum( &ps );
1131         prs_set_offset( &ps, 0 );
1132         if ( !prs_regf_block( "regf_header", &ps, 0, file ) ) {
1133                 result = False;
1134                 goto out;
1135         }
1136
1137         if ( write_block( file, &ps, 0 ) == -1 ) {
1138                 DEBUG(0,("init_regf_block: Failed to initialize registry header block!\n"));
1139                 result = False;
1140                 goto out;
1141         }
1142
1143 out:
1144         prs_mem_free( &ps );
1145
1146         return result;
1147 }
1148 /*******************************************************************
1149  Open the registry file and then read in the REGF block to get the
1150  first hbin offset.
1151 *******************************************************************/
1152
1153  REGF_FILE* regfio_open( const char *filename, int flags, int mode )
1154 {
1155         REGF_FILE *rb;
1156
1157         if ( !(rb = SMB_MALLOC_P(REGF_FILE)) ) {
1158                 DEBUG(0,("ERROR allocating memory\n"));
1159                 return NULL;
1160         }
1161         ZERO_STRUCTP( rb );
1162         rb->fd = -1;
1163
1164         if ( !(rb->mem_ctx = talloc_init( "read_regf_block" )) ) {
1165                 regfio_close( rb );
1166                 return NULL;
1167         }
1168
1169         rb->open_flags = flags;
1170
1171         /* open and existing file */
1172
1173         if ( (rb->fd = open(filename, flags, mode)) == -1 ) {
1174                 DEBUG(0,("regfio_open: failure to open %s (%s)\n", filename, strerror(errno)));
1175                 regfio_close( rb );
1176                 return NULL;
1177         }
1178
1179         /* check if we are creating a new file or overwriting an existing one */
1180
1181         if ( flags & (O_CREAT|O_TRUNC) ) {
1182                 if ( !init_regf_block( rb ) ) {
1183                         DEBUG(0,("regfio_open: Failed to read initial REGF block\n"));
1184                         regfio_close( rb );
1185                         return NULL;
1186                 }
1187
1188                 /* success */
1189                 return rb;
1190         }
1191
1192         /* read in an existing file */
1193
1194         if ( !read_regf_block( rb ) ) {
1195                 DEBUG(0,("regfio_open: Failed to read initial REGF block\n"));
1196                 regfio_close( rb );
1197                 return NULL;
1198         }
1199
1200         /* success */
1201
1202         return rb;
1203 }
1204
1205 /*******************************************************************
1206 *******************************************************************/
1207
1208 static void regfio_mem_free( REGF_FILE *file )
1209 {
1210         /* free any talloc()'d memory */
1211
1212         if ( file && file->mem_ctx )
1213                 talloc_destroy( file->mem_ctx );
1214 }
1215
1216 /*******************************************************************
1217 *******************************************************************/
1218
1219  int regfio_close( REGF_FILE *file )
1220 {
1221         int fd;
1222
1223         /* cleanup for a file opened for write */
1224
1225         if ( file->open_flags & (O_WRONLY|O_RDWR) ) {
1226                 prs_struct ps;
1227                 REGF_SK_REC *sk;
1228
1229                 /* write of sd list */
1230
1231                 for ( sk=file->sec_desc_list; sk; sk=sk->next ) {
1232                         hbin_prs_sk_rec( "sk_rec", sk->hbin, 0, sk );
1233                 }
1234
1235                 /* flush any dirty blocks */
1236
1237                 while ( file->block_list ) {
1238                         hbin_block_close( file, file->block_list );
1239                 }
1240
1241                 ZERO_STRUCT( ps );
1242
1243                 unix_to_nt_time( &file->mtime, time(NULL) );
1244
1245                 if ( read_block( file, &ps, 0, REGF_BLOCKSIZE ) != -1 ) {
1246                         /* now use for writing */
1247                         prs_switch_type( &ps, MARSHALL );
1248
1249                         /* stream the block once, generate the checksum,
1250                            and stream it again */
1251                         prs_set_offset( &ps, 0 );
1252                         prs_regf_block( "regf_blocK", &ps, 0, file );
1253                         file->checksum = regf_block_checksum( &ps );
1254                         prs_set_offset( &ps, 0 );
1255                         prs_regf_block( "regf_blocK", &ps, 0, file );
1256
1257                         /* now we are ready to write it to disk */
1258                         if ( write_block( file, &ps, 0 ) == -1 )
1259                                 DEBUG(0,("regfio_close: failed to update the regf header block!\n"));
1260                 }
1261
1262                 prs_mem_free( &ps );
1263         }
1264
1265         regfio_mem_free( file );
1266
1267         /* nothing tdo do if there is no open file */
1268
1269         if ( !file || (file->fd == -1) )
1270                 return 0;
1271
1272         fd = file->fd;
1273         file->fd = -1;
1274         SAFE_FREE( file );
1275
1276         return close( fd );
1277 }
1278
1279 /*******************************************************************
1280 *******************************************************************/
1281
1282 static void regfio_flush( REGF_FILE *file )
1283 {
1284         REGF_HBIN *hbin;
1285
1286         for ( hbin=file->block_list; hbin; hbin=hbin->next ) {
1287                 write_hbin_block( file, hbin );
1288         }
1289 }
1290
1291 /*******************************************************************
1292  There should be only *one* root key in the registry file based
1293  on my experience.  --jerry
1294 *******************************************************************/
1295
1296 REGF_NK_REC* regfio_rootkey( REGF_FILE *file )
1297 {
1298         REGF_NK_REC *nk;
1299         REGF_HBIN   *hbin;
1300         uint32      offset = REGF_BLOCKSIZE;
1301         BOOL        found = False;
1302         BOOL        eob;
1303
1304         if ( !file )
1305                 return NULL;
1306
1307         if ( !(nk = TALLOC_ZERO_P( file->mem_ctx, REGF_NK_REC )) ) {
1308                 DEBUG(0,("regfio_rootkey: talloc() failed!\n"));
1309                 return NULL;
1310         }
1311
1312         /* scan through the file on HBIN block at a time looking
1313            for an NK record with a type == 0x002c.
1314            Normally this is the first nk record in the first hbin
1315            block (but I'm not assuming that for now) */
1316
1317         while ( (hbin = read_hbin_block( file, offset )) ) {
1318                 eob = False;
1319
1320                 while ( !eob) {
1321                         if ( next_nk_record( file, hbin, nk, &eob ) ) {
1322                                 if ( nk->key_type == NK_TYPE_ROOTKEY ) {
1323                                         found = True;
1324                                         break;
1325                                 }
1326                         }
1327                         prs_mem_free( &hbin->ps );
1328                 }
1329
1330                 if ( found )
1331                         break;
1332
1333                 offset += hbin->block_size;
1334         }
1335
1336         if ( !found ) {
1337                 DEBUG(0,("regfio_rootkey: corrupt registry file ?  No root key record located\n"));
1338                 return NULL;
1339         }
1340
1341         DLIST_ADD( file->block_list, hbin );
1342
1343         return nk;
1344 }
1345
1346 /*******************************************************************
1347  This acts as an interator over the subkeys defined for a given
1348  NK record.  Remember that offsets are from the *first* HBIN block.
1349 *******************************************************************/
1350
1351  REGF_NK_REC* regfio_fetch_subkey( REGF_FILE *file, REGF_NK_REC *nk )
1352 {
1353         REGF_NK_REC *subkey;
1354         REGF_HBIN   *hbin;
1355         uint32      nk_offset;
1356
1357         /* see if there is anything left to report */
1358
1359         if ( !nk || (nk->subkeys_off==REGF_OFFSET_NONE) || (nk->subkey_index >= nk->num_subkeys) )
1360                 return NULL;
1361
1362         /* find the HBIN block which should contain the nk record */
1363
1364         if ( !(hbin = lookup_hbin_block( file, nk->subkeys.hashes[nk->subkey_index].nk_off )) ) {
1365                 DEBUG(0,("hbin_prs_key: Failed to find HBIN block containing offset [0x%x]\n",
1366                         nk->subkeys.hashes[nk->subkey_index].nk_off));
1367                 return NULL;
1368         }
1369
1370         nk_offset = nk->subkeys.hashes[nk->subkey_index].nk_off;
1371         if ( !prs_set_offset( &hbin->ps, (HBIN_HDR_SIZE + nk_offset - hbin->first_hbin_off) ) )
1372                 return NULL;
1373
1374         nk->subkey_index++;
1375         if ( !(subkey = TALLOC_ZERO_P( file->mem_ctx, REGF_NK_REC )) )
1376                 return NULL;
1377
1378         if ( !hbin_prs_key( file, hbin, subkey ) )
1379                 return NULL;
1380
1381         return subkey;
1382 }
1383
1384
1385 /*******************************************************************
1386 *******************************************************************/
1387
1388 static REGF_HBIN* regf_hbin_allocate( REGF_FILE *file, uint32 block_size )
1389 {
1390         REGF_HBIN *hbin;
1391         SMB_STRUCT_STAT sbuf;
1392
1393         if ( !(hbin = TALLOC_ZERO_P( file->mem_ctx, REGF_HBIN )) )
1394                 return NULL;
1395
1396         memcpy( hbin->header, "hbin", sizeof(HBIN_HDR_SIZE) );
1397
1398
1399         if ( sys_fstat( file->fd, &sbuf ) ) {
1400                 DEBUG(0,("regf_hbin_allocate: stat() failed! (%s)\n", strerror(errno)));
1401                 return NULL;
1402         }
1403
1404         hbin->file_off       = sbuf.st_size;
1405
1406         hbin->free_off       = HBIN_HEADER_REC_SIZE;
1407         hbin->free_size      = block_size - hbin->free_off + sizeof(uint32);;
1408
1409         hbin->block_size     = block_size;
1410         hbin->first_hbin_off = hbin->file_off - REGF_BLOCKSIZE;
1411
1412         if ( !prs_init( &hbin->ps, block_size, file->mem_ctx, MARSHALL ) )
1413                 return NULL;
1414
1415         if ( !prs_hbin_block( "new_hbin", &hbin->ps, 0, hbin ) )
1416                 return NULL;
1417
1418         if ( !write_hbin_block( file, hbin ) )
1419                 return NULL;
1420
1421         file->last_block = hbin->file_off;
1422
1423         return hbin;
1424 }
1425
1426 /*******************************************************************
1427 *******************************************************************/
1428
1429 static void update_free_space( REGF_HBIN *hbin, uint32 size_used )
1430 {
1431         hbin->free_off  += size_used;
1432         hbin->free_size -= size_used;
1433
1434         if ( hbin->free_off >= hbin->block_size ) {
1435                 hbin->free_off = REGF_OFFSET_NONE;
1436         }
1437
1438         return;
1439 }
1440
1441 /*******************************************************************
1442 *******************************************************************/
1443
1444 static REGF_HBIN* find_free_space( REGF_FILE *file, uint32 size )
1445 {
1446         REGF_HBIN *hbin, *p_hbin;
1447         uint32 block_off;
1448         BOOL cached;
1449
1450         /* check open block list */
1451
1452         for ( hbin=file->block_list; hbin!=NULL; hbin=hbin->next ) {
1453                 /* only check blocks that actually have available space */
1454
1455                 if ( hbin->free_off == REGF_OFFSET_NONE )
1456                         continue;
1457
1458                 /* check for a large enough available chunk */
1459
1460                 if ( (hbin->block_size - hbin->free_off) >= size ) {
1461                         DLIST_PROMOTE( file->block_list, hbin );
1462                         goto done;
1463                 }
1464         }
1465
1466         /* parse the file until we find a block with
1467            enough free space; save the last non-filled hbin */
1468
1469         block_off = REGF_BLOCKSIZE;
1470         do {
1471                 /* cleanup before the next round */
1472                 cached = False;
1473                 if ( hbin )
1474                         prs_mem_free( &hbin->ps );
1475
1476                 hbin = read_hbin_block( file, block_off );
1477
1478                 if ( hbin ) {
1479
1480                         /* make sure that we don't already have this block in memory */
1481
1482                         for ( p_hbin=file->block_list; p_hbin!=NULL; p_hbin=p_hbin->next ) {
1483                                 if ( p_hbin->file_off == hbin->file_off ) {
1484                                         cached = True;
1485                                         break;
1486                                 }
1487                         }
1488
1489                         block_off = hbin->file_off + hbin->block_size;
1490
1491                         if ( cached ) {
1492                                 prs_mem_free( &hbin->ps );
1493                                 hbin = NULL;
1494                                 continue;
1495                         }
1496                 }
1497         /* if (cached block or (new block and not enough free space)) then continue looping */
1498         } while ( cached || (hbin && (hbin->free_size < size)) );
1499
1500         /* no free space; allocate a new one */
1501
1502         if ( !hbin ) {
1503                 uint32 alloc_size;
1504
1505                 /* allocate in multiples of REGF_ALLOC_BLOCK; make sure (size + hbin_header) fits */
1506
1507                 alloc_size = ((size+HBIN_HEADER_REC_SIZE) / REGF_ALLOC_BLOCK ) + REGF_ALLOC_BLOCK;
1508
1509                 if ( !(hbin = regf_hbin_allocate( file, alloc_size )) ) {
1510                         DEBUG(0,("find_free_space: regf_hbin_allocate() failed!\n"));
1511                         return NULL;
1512                 }
1513                 DLIST_ADD( file->block_list, hbin );
1514         }
1515
1516 done:
1517         /* set the offset to be ready to write */
1518
1519         if ( !prs_set_offset( &hbin->ps, hbin->free_off-sizeof(uint32) ) )
1520                 return NULL;
1521
1522         /* write the record size as a placeholder for now, it should be
1523            probably updated by the caller once it all of the data necessary
1524            for the record */
1525
1526         if ( !prs_uint32("allocated_size", &hbin->ps, 0, &size) )
1527                 return False;
1528
1529         update_free_space( hbin, size );
1530
1531         return hbin;
1532 }
1533
1534 /*******************************************************************
1535 *******************************************************************/
1536
1537 static uint32 sk_record_data_size( SEC_DESC * sd )
1538 {
1539         uint32 size, size_mod8;
1540
1541         size_mod8 = 0;
1542
1543         /* the record size is sizeof(hdr) + name + static members + data_size_field */
1544
1545         size = sizeof(uint32)*5 + sec_desc_size( sd ) + sizeof(uint32);
1546
1547         /* multiple of 8 */
1548         size_mod8 = size & 0xfffffff8;
1549         if ( size_mod8 < size )
1550                 size_mod8 += 8;
1551
1552         return size_mod8;
1553 }
1554
1555 /*******************************************************************
1556 *******************************************************************/
1557
1558 static uint32 vk_record_data_size( REGF_VK_REC *vk )
1559 {
1560         uint32 size, size_mod8;
1561
1562         size_mod8 = 0;
1563
1564         /* the record size is sizeof(hdr) + name + static members + data_size_field */
1565
1566         size = REC_HDR_SIZE + (sizeof(uint16)*3) + (sizeof(uint32)*3) + sizeof(uint32);
1567
1568         if ( vk->valuename )
1569                 size += strlen(vk->valuename);
1570
1571         /* multiple of 8 */
1572         size_mod8 = size & 0xfffffff8;
1573         if ( size_mod8 < size )
1574                 size_mod8 += 8;
1575
1576         return size_mod8;
1577 }
1578
1579 /*******************************************************************
1580 *******************************************************************/
1581
1582 static uint32 lf_record_data_size( uint32 num_keys )
1583 {
1584         uint32 size, size_mod8;
1585
1586         size_mod8 = 0;
1587
1588         /* the record size is sizeof(hdr) + num_keys + sizeof of hash_array + data_size_uint32 */
1589
1590         size = REC_HDR_SIZE + sizeof(uint16) + (sizeof(REGF_HASH_REC) * num_keys) + sizeof(uint32);
1591
1592         /* multiple of 8 */
1593         size_mod8 = size & 0xfffffff8;
1594         if ( size_mod8 < size )
1595                 size_mod8 += 8;
1596
1597         return size_mod8;
1598 }
1599
1600 /*******************************************************************
1601 *******************************************************************/
1602
1603 static uint32 nk_record_data_size( REGF_NK_REC *nk )
1604 {
1605         uint32 size, size_mod8;
1606
1607         size_mod8 = 0;
1608
1609         /* the record size is static + length_of_keyname + length_of_classname + data_size_uint32 */
1610
1611         size = 0x4c + strlen(nk->keyname) + sizeof(uint32);
1612
1613         if ( nk->classname )
1614                 size += strlen( nk->classname );
1615
1616         /* multiple of 8 */
1617         size_mod8 = size & 0xfffffff8;
1618         if ( size_mod8 < size )
1619                 size_mod8 += 8;
1620
1621         return size_mod8;
1622 }
1623
1624 /*******************************************************************
1625 *******************************************************************/
1626
1627 static BOOL create_vk_record( REGF_FILE *file, REGF_VK_REC *vk, REGISTRY_VALUE *value )
1628 {
1629         char *name = regval_name(value);
1630         REGF_HBIN *data_hbin;
1631
1632         ZERO_STRUCTP( vk );
1633
1634         memcpy( vk->header, "vk", REC_HDR_SIZE );
1635
1636         if ( name ) {
1637                 vk->valuename = talloc_strdup( file->mem_ctx, regval_name(value) );
1638                 vk->flag = VK_FLAG_NAME_PRESENT;
1639         }
1640
1641         vk->data_size = regval_size( value );
1642         vk->type      = regval_type( value );
1643
1644         if ( vk->data_size > sizeof(uint32) ) {
1645                 uint32 data_size = ( (vk->data_size+sizeof(uint32)) & 0xfffffff8 ) + 8;
1646
1647                 vk->data = TALLOC_MEMDUP( file->mem_ctx, regval_data_p(value), vk->data_size );
1648
1649                 /* go ahead and store the offset....we'll pick this hbin block back up when
1650                    we stream the data */
1651
1652                 data_hbin = find_free_space(file, data_size );
1653                 vk->data_off = prs_offset( &data_hbin->ps ) + data_hbin->first_hbin_off - HBIN_HDR_SIZE;
1654         }
1655         else {
1656                 /* make sure we don't try to copy from a NULL value pointer */
1657
1658                 if ( vk->data_size != 0 )
1659                         memcpy( &vk->data_off, regval_data_p(value), sizeof(uint32) );
1660                 vk->data_size |= VK_DATA_IN_OFFSET;
1661         }
1662
1663         return True;
1664 }
1665
1666 /*******************************************************************
1667 *******************************************************************/
1668
1669 static int hashrec_cmp( REGF_HASH_REC *h1, REGF_HASH_REC *h2 )
1670 {
1671         return StrnCaseCmp( h1->keycheck, h2->keycheck, sizeof(uint32) );
1672 }
1673
1674 /*******************************************************************
1675 *******************************************************************/
1676
1677  REGF_NK_REC* regfio_write_key( REGF_FILE *file, const char *name,
1678                                REGVAL_CTR *values, REGSUBKEY_CTR *subkeys,
1679                                SEC_DESC *sec_desc, REGF_NK_REC *parent )
1680 {
1681         REGF_NK_REC *nk;
1682         REGF_HBIN *vlist_hbin = NULL;
1683         uint32 size;
1684
1685         if ( !(nk = TALLOC_ZERO_P( file->mem_ctx, REGF_NK_REC )) )
1686                 return NULL;
1687
1688         memcpy( nk->header, "nk", REC_HDR_SIZE );
1689
1690         if ( !parent )
1691                 nk->key_type = NK_TYPE_ROOTKEY;
1692         else
1693                 nk->key_type = NK_TYPE_NORMALKEY;
1694
1695         /* store the parent offset (or -1 if a the root key */
1696
1697         nk->parent_off = parent ? (parent->hbin_off + parent->hbin->file_off - REGF_BLOCKSIZE - HBIN_HDR_SIZE ) : REGF_OFFSET_NONE;
1698
1699         /* no classname currently */
1700
1701         nk->classname_off = REGF_OFFSET_NONE;
1702         nk->classname = NULL;
1703         nk->keyname = talloc_strdup( file->mem_ctx, name );
1704
1705         /* current modification time */
1706
1707         unix_to_nt_time( &nk->mtime, time(NULL) );
1708
1709         /* allocate the record on disk */
1710
1711         size = nk_record_data_size( nk );
1712         nk->rec_size = ( size - 1 ) ^ 0XFFFFFFFF;
1713         nk->hbin = find_free_space( file, size );
1714         nk->hbin_off = prs_offset( &nk->hbin->ps );
1715
1716         /* Update the hash record in the parent */
1717
1718         if ( parent ) {
1719                 REGF_HASH_REC *hash = &parent->subkeys.hashes[parent->subkey_index];
1720
1721                 hash->nk_off = prs_offset( &nk->hbin->ps ) + nk->hbin->first_hbin_off - HBIN_HDR_SIZE;
1722                 memcpy( hash->keycheck, name, sizeof(uint32) );
1723                 parent->subkey_index++;
1724
1725                 /* sort the list by keyname */
1726
1727                 qsort( parent->subkeys.hashes, parent->subkey_index, sizeof(REGF_HASH_REC), QSORT_CAST hashrec_cmp );
1728
1729                 if ( !hbin_prs_lf_records( "lf_rec", parent->subkeys.hbin, 0, parent ) )
1730                         return False;
1731         }
1732
1733         /* write the security descriptor */
1734
1735         nk->sk_off = REGF_OFFSET_NONE;
1736         if ( sec_desc ) {
1737                 uint32 sk_size = sk_record_data_size( sec_desc );
1738                 REGF_HBIN *sk_hbin;
1739                 REGF_SK_REC *tmp = NULL;
1740
1741                 /* search for it in the existing list of sd's */
1742
1743                 if ( (nk->sec_desc = find_sk_record_by_sec_desc( file, sec_desc )) == NULL ) {
1744                         /* not found so add it to the list */
1745
1746                         sk_hbin = find_free_space( file, sk_size );
1747
1748                         if ( !(nk->sec_desc = TALLOC_ZERO_P( file->mem_ctx, REGF_SK_REC )) )
1749                                 return NULL;
1750
1751                         /* now we have to store the security descriptor in the list and
1752                            update the offsets */
1753
1754                         memcpy( nk->sec_desc->header, "sk", REC_HDR_SIZE );
1755                         nk->sec_desc->hbin      = sk_hbin;
1756                         nk->sec_desc->hbin_off  = prs_offset( &sk_hbin->ps );
1757                         nk->sec_desc->sk_off    = prs_offset( &sk_hbin->ps ) + sk_hbin->first_hbin_off - HBIN_HDR_SIZE;
1758                         nk->sec_desc->rec_size  = (sk_size-1)  ^ 0xFFFFFFFF;
1759
1760                         nk->sec_desc->sec_desc  = sec_desc;
1761                         nk->sec_desc->ref_count = 0;
1762
1763                         /* size value must be self-inclusive */
1764                         nk->sec_desc->size      = sec_desc_size(sec_desc) + sizeof(uint32);
1765
1766                         DLIST_ADD_END( file->sec_desc_list, nk->sec_desc, tmp );
1767
1768                         /* initialize offsets */
1769
1770                         nk->sec_desc->prev_sk_off = nk->sec_desc->sk_off;
1771                         nk->sec_desc->next_sk_off = nk->sec_desc->sk_off;
1772
1773                         /* now update the offsets for us and the previous sd in the list */
1774
1775                         if ( nk->sec_desc->prev ) {
1776                                 REGF_SK_REC *prev = nk->sec_desc->prev;
1777
1778                                 nk->sec_desc->prev_sk_off = prev->hbin_off + prev->hbin->first_hbin_off - HBIN_HDR_SIZE;
1779                                 prev->next_sk_off = nk->sk_off;
1780                         }
1781                 }
1782
1783                 /* dump the reference count */
1784
1785                 nk->sk_off = nk->sec_desc->sk_off;
1786                 nk->sec_desc->ref_count++;
1787         }
1788
1789         /* write the subkeys */
1790
1791         nk->subkeys_off = REGF_OFFSET_NONE;
1792         if ( (nk->num_subkeys = regsubkey_ctr_numkeys( subkeys )) != 0 ) {
1793                 uint32 lf_size = lf_record_data_size( nk->num_subkeys );
1794                 uint32 namelen;
1795                 int i;
1796
1797                 nk->subkeys.hbin = find_free_space( file, lf_size );
1798                 nk->subkeys.hbin_off = prs_offset( &nk->subkeys.hbin->ps );
1799                 nk->subkeys.rec_size = (lf_size-1) ^ 0xFFFFFFFF;
1800                 nk->subkeys_off = prs_offset( &nk->subkeys.hbin->ps ) + nk->subkeys.hbin->first_hbin_off - HBIN_HDR_SIZE;
1801
1802                 memcpy( nk->subkeys.header, "lf", REC_HDR_SIZE );
1803
1804                 nk->subkeys.num_keys = nk->num_subkeys;
1805                 if ( !(nk->subkeys.hashes = TALLOC_ZERO_ARRAY( file->mem_ctx, REGF_HASH_REC, nk->subkeys.num_keys )) )
1806                         return NULL;
1807                 nk->subkey_index = 0;
1808
1809                 /* update the max_bytes_subkey{name,classname} fields */
1810                 for ( i=0; i<nk->num_subkeys; i++ ) {
1811                         namelen = strlen( regsubkey_ctr_specific_key(subkeys, i) );
1812                         if ( namelen*2 > nk->max_bytes_subkeyname )
1813                                 nk->max_bytes_subkeyname = namelen * 2;
1814                 }
1815         }
1816
1817         /* write the values */
1818
1819         nk->values_off = REGF_OFFSET_NONE;
1820         if ( (nk->num_values = regval_ctr_numvals( values )) != 0 ) {
1821                 uint32 vlist_size = ( ( nk->num_values * sizeof(uint32) ) & 0xfffffff8 ) + 8;
1822                 int i;
1823
1824                 vlist_hbin = find_free_space( file, vlist_size );
1825                 nk->values_off = prs_offset( &vlist_hbin->ps ) + vlist_hbin->first_hbin_off - HBIN_HDR_SIZE;
1826
1827                 if ( !(nk->values = TALLOC_ARRAY( file->mem_ctx, REGF_VK_REC, nk->num_values )) )
1828                         return NULL;
1829
1830                 /* create the vk records */
1831
1832                 for ( i=0; i<nk->num_values; i++ ) {
1833                         uint32 vk_size, namelen, datalen;
1834                         REGISTRY_VALUE *r;
1835
1836                         r = regval_ctr_specific_value( values, i );
1837                         create_vk_record( file, &nk->values[i], r );
1838                         vk_size = vk_record_data_size( &nk->values[i] );
1839                         nk->values[i].hbin = find_free_space( file, vk_size );
1840                         nk->values[i].hbin_off = prs_offset( &nk->values[i].hbin->ps );
1841                         nk->values[i].rec_size = ( vk_size - 1 ) ^ 0xFFFFFFFF;
1842                         nk->values[i].rec_off = prs_offset( &nk->values[i].hbin->ps )
1843                                 + nk->values[i].hbin->first_hbin_off
1844                                 - HBIN_HDR_SIZE;
1845
1846                         /* update the max bytes fields if necessary */
1847
1848                         namelen = strlen( regval_name(r) );
1849                         if ( namelen*2 > nk->max_bytes_valuename )
1850                                 nk->max_bytes_valuename = namelen * 2;
1851
1852                         datalen = regval_size( r );
1853                         if ( datalen*2 > nk->max_bytes_value )
1854                                 nk->max_bytes_value = datalen * 2;
1855                 }
1856         }
1857
1858         /* stream the records */
1859
1860         prs_set_offset( &nk->hbin->ps, nk->hbin_off );
1861         if ( !prs_nk_rec( "nk_rec", &nk->hbin->ps, 0, nk ) )
1862                 return False;
1863
1864         if ( nk->num_values ) {
1865                 if ( !hbin_prs_vk_records( "vk_records", vlist_hbin, 0, nk, file ) )
1866                         return False;
1867         }
1868
1869
1870         regfio_flush( file );
1871
1872         return nk;
1873 }
1874