5d9734b15e0526ef9138d3199d70f82864f2db55
[ira/wip.git] / source3 / registry / regfio.c
1 /*
2  * Unix SMB/CIFS implementation.
3  * Windows NT registry I/O library
4  * Copyright (c) Gerald (Jerry) Carter               2005
5  *
6  * This program is free software; you can redistribute it and/or modify
7  * it under the terms of the GNU General Public License as published by
8  * the Free Software Foundation; either version 3 of the License, or
9  * (at your option) any later version.
10  *
11  * This program is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14  * GNU General Public License for more details.
15  *
16  * You should have received a copy of the GNU General Public License
17  * along with this program; if not, see <http://www.gnu.org/licenses/>.  
18  */
19
20 #include "includes.h"
21 #include "regfio.h"
22
23 #undef DBGC_CLASS
24 #define DBGC_CLASS DBGC_REGISTRY
25
26 /*******************************************************************
27  *
28  * TODO : Right now this code basically ignores classnames.
29  *
30  ******************************************************************/
31
32
33 /*******************************************************************
34 *******************************************************************/
35
36 static int write_block( REGF_FILE *file, prs_struct *ps, uint32 offset )
37 {
38         int bytes_written, returned;
39         char *buffer = prs_data_p( ps );
40         uint32 buffer_size = prs_data_size( ps );
41         SMB_STRUCT_STAT sbuf;
42
43         if ( file->fd == -1 )
44                 return -1;
45
46         /* check for end of file */
47
48         if (sys_fstat(file->fd, &sbuf, false)) {
49                 DEBUG(0,("write_block: stat() failed! (%s)\n", strerror(errno)));
50                 return -1;
51         }
52
53         if ( lseek( file->fd, offset, SEEK_SET ) == -1 ) {
54                 DEBUG(0,("write_block: lseek() failed! (%s)\n", strerror(errno) ));
55                 return -1;
56         }
57         
58         bytes_written = returned = 0;
59         while ( bytes_written < buffer_size ) {
60                 if ( (returned = write( file->fd, buffer+bytes_written, buffer_size-bytes_written )) == -1 ) {
61                         DEBUG(0,("write_block: write() failed! (%s)\n", strerror(errno) ));
62                         return False;
63                 }
64                                 
65                 bytes_written += returned;
66         }
67         
68         return bytes_written;
69 }
70
71 /*******************************************************************
72 *******************************************************************/
73
74 static int read_block( REGF_FILE *file, prs_struct *ps, uint32 file_offset, uint32 block_size )
75 {
76         int bytes_read, returned;
77         char *buffer;
78         SMB_STRUCT_STAT sbuf;
79
80         /* check for end of file */
81
82         if (sys_fstat(file->fd, &sbuf, false)) {
83                 DEBUG(0,("read_block: stat() failed! (%s)\n", strerror(errno)));
84                 return -1;
85         }
86
87         if ( (size_t)file_offset >= sbuf.st_ex_size )
88                 return -1;
89         
90         /* if block_size == 0, we are parsing HBIN records and need 
91            to read some of the header to get the block_size from there */
92            
93         if ( block_size == 0 ) {
94                 char hdr[0x20];
95
96                 if ( lseek( file->fd, file_offset, SEEK_SET ) == -1 ) {
97                         DEBUG(0,("read_block: lseek() failed! (%s)\n", strerror(errno) ));
98                         return -1;
99                 }
100
101                 returned = read( file->fd, hdr, 0x20 );
102                 if ( (returned == -1) || (returned < 0x20) ) {
103                         DEBUG(0,("read_block: failed to read in HBIN header. Is the file corrupt?\n"));
104                         return -1;
105                 }
106
107                 /* make sure this is an hbin header */
108
109                 if ( strncmp( hdr, "hbin", HBIN_HDR_SIZE ) != 0 ) {
110                         DEBUG(0,("read_block: invalid block header!\n"));
111                         return -1;
112                 }
113
114                 block_size = IVAL( hdr, 0x08 );
115         }
116
117         DEBUG(10,("read_block: block_size == 0x%x\n", block_size ));
118
119         /* set the offset, initialize the buffer, and read the block from disk */
120
121         if ( lseek( file->fd, file_offset, SEEK_SET ) == -1 ) {
122                 DEBUG(0,("read_block: lseek() failed! (%s)\n", strerror(errno) ));
123                 return -1;
124         }
125         
126         if (!prs_init( ps, block_size, file->mem_ctx, UNMARSHALL )) {
127                 DEBUG(0,("read_block: prs_init() failed! (%s)\n", strerror(errno) ));
128                 return -1;
129         }
130         buffer = prs_data_p( ps );
131         bytes_read = returned = 0;
132
133         while ( bytes_read < block_size ) {
134                 if ( (returned = read( file->fd, buffer+bytes_read, block_size-bytes_read )) == -1 ) {
135                         DEBUG(0,("read_block: read() failed (%s)\n", strerror(errno) ));
136                         return False;
137                 }
138                 if ( (returned == 0) && (bytes_read < block_size) ) {
139                         DEBUG(0,("read_block: not a vald registry file ?\n" ));
140                         return False;
141                 }       
142                 
143                 bytes_read += returned;
144         }
145         
146         return bytes_read;
147 }
148
149 /*******************************************************************
150 *******************************************************************/
151
152 static bool write_hbin_block( REGF_FILE *file, REGF_HBIN *hbin )
153 {
154         if ( !hbin->dirty )
155                 return True;
156
157         /* write free space record if any is available */
158
159         if ( hbin->free_off != REGF_OFFSET_NONE ) {
160                 uint32 header = 0xffffffff;
161
162                 if ( !prs_set_offset( &hbin->ps, hbin->free_off-sizeof(uint32) ) )
163                         return False;
164                 if ( !prs_uint32( "free_size", &hbin->ps, 0, &hbin->free_size ) )
165                         return False;
166                 if ( !prs_uint32( "free_header", &hbin->ps, 0, &header ) )
167                         return False;
168         }
169
170         hbin->dirty = (write_block( file, &hbin->ps, hbin->file_off ) != -1);
171
172         return hbin->dirty;
173 }
174
175 /*******************************************************************
176 *******************************************************************/
177
178 static bool hbin_block_close( REGF_FILE *file, REGF_HBIN *hbin )
179 {
180         REGF_HBIN *p;
181
182         /* remove the block from the open list and flush it to disk */
183
184         for ( p=file->block_list; p && p!=hbin; p=p->next )
185                 ;;
186
187         if ( p == hbin ) {
188                 DLIST_REMOVE( file->block_list, hbin );
189         }
190         else
191                 DEBUG(0,("hbin_block_close: block not in open list!\n"));
192
193         if ( !write_hbin_block( file, hbin ) )
194                 return False;
195
196         return True;
197 }
198
199 /*******************************************************************
200 *******************************************************************/
201
202 static bool prs_regf_block( const char *desc, prs_struct *ps, int depth, REGF_FILE *file )
203 {
204         prs_debug(ps, depth, desc, "prs_regf_block");
205         depth++;
206         
207         if ( !prs_uint8s( True, "header", ps, depth, (uint8*)file->header, sizeof( file->header )) )
208                 return False;
209         
210         /* yes, these values are always identical so store them only once */
211         
212         if ( !prs_uint32( "unknown1", ps, depth, &file->unknown1 ))
213                 return False;
214         if ( !prs_uint32( "unknown1 (again)", ps, depth, &file->unknown1 ))
215                 return False;
216
217         /* get the modtime */
218         
219         if ( !prs_set_offset( ps, 0x0c ) )
220                 return False;
221         if ( !smb_io_time( "modtime", &file->mtime, ps, depth ) )
222                 return False;
223
224         /* constants */
225         
226         if ( !prs_uint32( "unknown2", ps, depth, &file->unknown2 ))
227                 return False;
228         if ( !prs_uint32( "unknown3", ps, depth, &file->unknown3 ))
229                 return False;
230         if ( !prs_uint32( "unknown4", ps, depth, &file->unknown4 ))
231                 return False;
232         if ( !prs_uint32( "unknown5", ps, depth, &file->unknown5 ))
233                 return False;
234
235         /* get file offsets */
236         
237         if ( !prs_set_offset( ps, 0x24 ) )
238                 return False;
239         if ( !prs_uint32( "data_offset", ps, depth, &file->data_offset ))
240                 return False;
241         if ( !prs_uint32( "last_block", ps, depth, &file->last_block ))
242                 return False;
243                 
244         /* one more constant */
245         
246         if ( !prs_uint32( "unknown6", ps, depth, &file->unknown6 ))
247                 return False;
248                 
249         /* get the checksum */
250         
251         if ( !prs_set_offset( ps, 0x01fc ) )
252                 return False;
253         if ( !prs_uint32( "checksum", ps, depth, &file->checksum ))
254                 return False;
255         
256         return True;
257 }
258
259 /*******************************************************************
260 *******************************************************************/
261
262 static bool prs_hbin_block( const char *desc, prs_struct *ps, int depth, REGF_HBIN *hbin )
263 {
264         uint32 block_size2;
265
266         prs_debug(ps, depth, desc, "prs_regf_block");
267         depth++;
268         
269         if ( !prs_uint8s( True, "header", ps, depth, (uint8*)hbin->header, sizeof( hbin->header )) )
270                 return False;
271
272         if ( !prs_uint32( "first_hbin_off", ps, depth, &hbin->first_hbin_off ))
273                 return False;
274
275         /* The dosreg.cpp comments say that the block size is at 0x1c.
276            According to a WINXP NTUSER.dat file, this is wrong.  The block_size
277            is at 0x08 */
278
279         if ( !prs_uint32( "block_size", ps, depth, &hbin->block_size ))
280                 return False;
281
282         block_size2 = hbin->block_size;
283         prs_set_offset( ps, 0x1c );
284         if ( !prs_uint32( "block_size2", ps, depth, &block_size2 ))
285                 return False;
286
287         if ( MARSHALLING(ps) )
288                 hbin->dirty = True;
289         
290
291         return True;
292 }
293
294 /*******************************************************************
295 *******************************************************************/
296
297 static bool prs_nk_rec( const char *desc, prs_struct *ps, int depth, REGF_NK_REC *nk )
298 {
299         uint16 class_length, name_length;
300         uint32 start;
301         uint32 data_size, start_off, end_off;
302         uint32 unknown_off = REGF_OFFSET_NONE;
303
304         nk->hbin_off = prs_offset( ps );
305         start = nk->hbin_off;
306         
307         prs_debug(ps, depth, desc, "prs_nk_rec");
308         depth++;
309         
310         /* back up and get the data_size */
311         
312         if ( !prs_set_offset( ps, prs_offset(ps)-sizeof(uint32)) )
313                 return False;
314         start_off = prs_offset( ps );
315         if ( !prs_uint32( "rec_size", ps, depth, &nk->rec_size ))
316                 return False;
317         
318         if ( !prs_uint8s( True, "header", ps, depth, (uint8*)nk->header, sizeof( nk->header )) )
319                 return False;
320                 
321         if ( !prs_uint16( "key_type", ps, depth, &nk->key_type ))
322                 return False;
323         if ( !smb_io_time( "mtime", &nk->mtime, ps, depth ))
324                 return False;
325                 
326         if ( !prs_set_offset( ps, start+0x0010 ) )
327                 return False;
328         if ( !prs_uint32( "parent_off", ps, depth, &nk->parent_off ))
329                 return False;
330         if ( !prs_uint32( "num_subkeys", ps, depth, &nk->num_subkeys ))
331                 return False;
332                 
333         if ( !prs_set_offset( ps, start+0x001c ) )
334                 return False;
335         if ( !prs_uint32( "subkeys_off", ps, depth, &nk->subkeys_off ))
336                 return False;
337         if ( !prs_uint32( "unknown_off", ps, depth, &unknown_off) )
338                 return False;
339                 
340         if ( !prs_set_offset( ps, start+0x0024 ) )
341                 return False;
342         if ( !prs_uint32( "num_values", ps, depth, &nk->num_values ))
343                 return False;
344         if ( !prs_uint32( "values_off", ps, depth, &nk->values_off ))
345                 return False;
346         if ( !prs_uint32( "sk_off", ps, depth, &nk->sk_off ))
347                 return False;
348         if ( !prs_uint32( "classname_off", ps, depth, &nk->classname_off ))
349                 return False;
350
351         if ( !prs_uint32( "max_bytes_subkeyname", ps, depth, &nk->max_bytes_subkeyname))
352                 return False;
353         if ( !prs_uint32( "max_bytes_subkeyclassname", ps, depth, &nk->max_bytes_subkeyclassname))
354                 return False;
355         if ( !prs_uint32( "max_bytes_valuename", ps, depth, &nk->max_bytes_valuename))
356                 return False;
357         if ( !prs_uint32( "max_bytes_value", ps, depth, &nk->max_bytes_value))
358                 return False;
359         if ( !prs_uint32( "unknown index", ps, depth, &nk->unk_index))
360                 return False;
361
362         name_length = nk->keyname ? strlen(nk->keyname) : 0 ;
363         class_length = nk->classname ? strlen(nk->classname) : 0 ;
364         if ( !prs_uint16( "name_length", ps, depth, &name_length ))
365                 return False;
366         if ( !prs_uint16( "class_length", ps, depth, &class_length ))
367                 return False;   
368                 
369         if ( class_length ) {
370                 ;;
371         }
372         
373         if ( name_length ) {
374                 if ( UNMARSHALLING(ps) ) {
375                         if ( !(nk->keyname = PRS_ALLOC_MEM( ps, char, name_length+1 )) )
376                                 return False;
377                 }
378
379                 if ( !prs_uint8s( True, "name", ps, depth, (uint8*)nk->keyname, name_length) )
380                         return False;
381
382                 if ( UNMARSHALLING(ps) ) 
383                         nk->keyname[name_length] = '\0';
384         }
385
386         end_off = prs_offset( ps );
387
388         /* data_size must be divisible by 8 and large enough to hold the original record */
389
390         data_size = ((start_off - end_off) & 0xfffffff8 );
391         if ( data_size > nk->rec_size )
392                 DEBUG(10,("Encountered reused record (0x%x < 0x%x)\n", data_size, nk->rec_size));
393
394         if ( MARSHALLING(ps) )
395                 nk->hbin->dirty = True;
396
397         return True;
398 }
399
400 /*******************************************************************
401 *******************************************************************/
402
403 static uint32 regf_block_checksum( prs_struct *ps )
404 {
405         char *buffer = prs_data_p( ps );
406         uint32 checksum, x;
407         int i;
408
409         /* XOR of all bytes 0x0000 - 0x01FB */
410                 
411         checksum = x = 0;
412         
413         for ( i=0; i<0x01FB; i+=4 ) {
414                 x = IVAL(buffer, i );
415                 checksum ^= x;
416         }
417         
418         return checksum;
419 }
420
421 /*******************************************************************
422 *******************************************************************/
423
424 static bool read_regf_block( REGF_FILE *file )
425 {
426         prs_struct ps;
427         uint32 checksum;
428         
429         /* grab the first block from the file */
430                 
431         if ( read_block( file, &ps, 0, REGF_BLOCKSIZE ) == -1 )
432                 return False;
433         
434         /* parse the block and verify the checksum */
435         
436         if ( !prs_regf_block( "regf_header", &ps, 0, file ) )
437                 return False;   
438                 
439         checksum = regf_block_checksum( &ps );
440         
441         prs_mem_free( &ps );
442         
443         if ( file->checksum !=  checksum ) {
444                 DEBUG(0,("read_regf_block: invalid checksum\n" ));
445                 return False;
446         }
447
448         return True;
449 }
450
451 /*******************************************************************
452 *******************************************************************/
453
454 static REGF_HBIN* read_hbin_block( REGF_FILE *file, off_t offset )
455 {
456         REGF_HBIN *hbin;
457         uint32 record_size, curr_off, block_size, header;
458         
459         if ( !(hbin = TALLOC_ZERO_P(file->mem_ctx, REGF_HBIN)) ) 
460                 return NULL;
461         hbin->file_off = offset;
462         hbin->free_off = -1;
463                 
464         if ( read_block( file, &hbin->ps, offset, 0 ) == -1 )
465                 return NULL;
466         
467         if ( !prs_hbin_block( "hbin", &hbin->ps, 0, hbin ) )
468                 return NULL;    
469
470         /* this should be the same thing as hbin->block_size but just in case */
471
472         block_size = prs_data_size( &hbin->ps );        
473
474         /* Find the available free space offset.  Always at the end,
475            so walk the record list and stop when you get to the end.
476            The end is defined by a record header of 0xffffffff.  The 
477            previous 4 bytes contains the amount of free space remaining 
478            in the hbin block. */
479
480         /* remember that the record_size is in the 4 bytes preceeding the record itself */
481
482         if ( !prs_set_offset( &hbin->ps, file->data_offset+HBIN_HDR_SIZE-sizeof(uint32) ) )
483                 return False;
484
485         record_size = 0;
486         header = 0;
487         curr_off = prs_offset( &hbin->ps );
488         while ( header != 0xffffffff ) {
489                 /* not done yet so reset the current offset to the 
490                    next record_size field */
491
492                 curr_off = curr_off+record_size;
493
494                 /* for some reason the record_size of the last record in
495                    an hbin block can extend past the end of the block
496                    even though the record fits within the remaining 
497                    space....aaarrrgggghhhhhh */
498
499                 if ( curr_off >= block_size ) {
500                         record_size = -1;
501                         curr_off = -1;
502                         break;
503                 }
504
505                 if ( !prs_set_offset( &hbin->ps, curr_off) )
506                         return False;
507
508                 if ( !prs_uint32( "rec_size", &hbin->ps, 0, &record_size ) )
509                         return False;
510                 if ( !prs_uint32( "header", &hbin->ps, 0, &header ) )
511                         return False;
512                 
513                 SMB_ASSERT( record_size != 0 );
514
515                 if ( record_size & 0x80000000 ) {
516                         /* absolute_value(record_size) */
517                         record_size = (record_size ^ 0xffffffff) + 1;
518                 }
519         }
520
521         /* save the free space offset */
522
523         if ( header == 0xffffffff ) {
524
525                 /* account for the fact that the curr_off is 4 bytes behind the actual 
526                    record header */
527
528                 hbin->free_off = curr_off + sizeof(uint32);
529                 hbin->free_size = record_size;
530         }
531
532         DEBUG(10,("read_hbin_block: free space offset == 0x%x\n", hbin->free_off));
533
534         if ( !prs_set_offset( &hbin->ps, file->data_offset+HBIN_HDR_SIZE )  )
535                 return False;
536         
537         return hbin;
538 }
539
540 /*******************************************************************
541  Input a random offset and receive the corresponding HBIN 
542  block for it
543 *******************************************************************/
544
545 static bool hbin_contains_offset( REGF_HBIN *hbin, uint32 offset )
546 {
547         if ( !hbin )
548                 return False;
549         
550         if ( (offset > hbin->first_hbin_off) && (offset < (hbin->first_hbin_off+hbin->block_size)) )
551                 return True;
552                 
553         return False;
554 }
555
556 /*******************************************************************
557  Input a random offset and receive the corresponding HBIN 
558  block for it
559 *******************************************************************/
560
561 static REGF_HBIN* lookup_hbin_block( REGF_FILE *file, uint32 offset )
562 {
563         REGF_HBIN *hbin = NULL;
564         uint32 block_off;
565
566         /* start with the open list */
567
568         for ( hbin=file->block_list; hbin; hbin=hbin->next ) {
569                 DEBUG(10,("lookup_hbin_block: address = 0x%x [0x%lx]\n", hbin->file_off, (unsigned long)hbin ));
570                 if ( hbin_contains_offset( hbin, offset ) )
571                         return hbin;
572         }
573         
574         if ( !hbin ) {
575                 /* start at the beginning */
576
577                 block_off = REGF_BLOCKSIZE;
578                 do {
579                         /* cleanup before the next round */
580                         if ( hbin )
581                                 prs_mem_free( &hbin->ps );
582
583                         hbin = read_hbin_block( file, block_off );
584
585                         if ( hbin ) 
586                                 block_off = hbin->file_off + hbin->block_size;
587
588                 } while ( hbin && !hbin_contains_offset( hbin, offset ) );
589         }
590
591         if ( hbin )
592                 DLIST_ADD( file->block_list, hbin );
593
594         return hbin;
595 }
596
597 /*******************************************************************
598 *******************************************************************/
599
600 static bool prs_hash_rec( const char *desc, prs_struct *ps, int depth, REGF_HASH_REC *hash )
601 {
602         prs_debug(ps, depth, desc, "prs_hash_rec");
603         depth++;
604
605         if ( !prs_uint32( "nk_off", ps, depth, &hash->nk_off ))
606                 return False;
607         if ( !prs_uint8s( True, "keycheck", ps, depth, hash->keycheck, sizeof( hash->keycheck )) )
608                 return False;
609         
610         return True;
611 }
612
613 /*******************************************************************
614 *******************************************************************/
615
616 static bool hbin_prs_lf_records( const char *desc, REGF_HBIN *hbin, int depth, REGF_NK_REC *nk )
617 {
618         int i;
619         REGF_LF_REC *lf = &nk->subkeys;
620         uint32 data_size, start_off, end_off;
621
622         prs_debug(&hbin->ps, depth, desc, "prs_lf_records");
623         depth++;
624
625         /* check if we have anything to do first */
626         
627         if ( nk->num_subkeys == 0 )
628                 return True;
629
630         /* move to the LF record */
631
632         if ( !prs_set_offset( &hbin->ps, nk->subkeys_off + HBIN_HDR_SIZE - hbin->first_hbin_off ) )
633                 return False;
634
635         /* backup and get the data_size */
636         
637         if ( !prs_set_offset( &hbin->ps, prs_offset(&hbin->ps)-sizeof(uint32)) )
638                 return False;
639         start_off = prs_offset( &hbin->ps );
640         if ( !prs_uint32( "rec_size", &hbin->ps, depth, &lf->rec_size ))
641                 return False;
642
643         if ( !prs_uint8s( True, "header", &hbin->ps, depth, (uint8*)lf->header, sizeof( lf->header )) )
644                 return False;
645                 
646         if ( !prs_uint16( "num_keys", &hbin->ps, depth, &lf->num_keys))
647                 return False;
648
649         if ( UNMARSHALLING(&hbin->ps) ) {
650                 if (lf->num_keys) {
651                         if ( !(lf->hashes = PRS_ALLOC_MEM( &hbin->ps, REGF_HASH_REC, lf->num_keys )) )
652                                 return False;
653                 } else {
654                         lf->hashes = NULL;
655                 }
656         }
657
658         for ( i=0; i<lf->num_keys; i++ ) {
659                 if ( !prs_hash_rec( "hash_rec", &hbin->ps, depth, &lf->hashes[i] ) )
660                         return False;
661         }
662
663         end_off = prs_offset( &hbin->ps );
664
665         /* data_size must be divisible by 8 and large enough to hold the original record */
666
667         data_size = ((start_off - end_off) & 0xfffffff8 );
668         if ( data_size > lf->rec_size )
669                 DEBUG(10,("Encountered reused record (0x%x < 0x%x)\n", data_size, lf->rec_size));
670
671         if ( MARSHALLING(&hbin->ps) )
672                 hbin->dirty = True;
673
674         return True;
675 }
676
677 /*******************************************************************
678 *******************************************************************/
679
680 static bool hbin_prs_sk_rec( const char *desc, REGF_HBIN *hbin, int depth, REGF_SK_REC *sk )
681 {
682         prs_struct *ps = &hbin->ps;
683         uint16 tag = 0xFFFF;
684         uint32 data_size, start_off, end_off;
685
686
687         prs_debug(ps, depth, desc, "hbin_prs_sk_rec");
688         depth++;
689
690         if ( !prs_set_offset( &hbin->ps, sk->sk_off + HBIN_HDR_SIZE - hbin->first_hbin_off ) )
691                 return False;
692
693         /* backup and get the data_size */
694         
695         if ( !prs_set_offset( &hbin->ps, prs_offset(&hbin->ps)-sizeof(uint32)) )
696                 return False;
697         start_off = prs_offset( &hbin->ps );
698         if ( !prs_uint32( "rec_size", &hbin->ps, depth, &sk->rec_size ))
699                 return False;
700
701         if ( !prs_uint8s( True, "header", ps, depth, (uint8*)sk->header, sizeof( sk->header )) )
702                 return False;
703         if ( !prs_uint16( "tag", ps, depth, &tag))
704                 return False;
705
706         if ( !prs_uint32( "prev_sk_off", ps, depth, &sk->prev_sk_off))
707                 return False;
708         if ( !prs_uint32( "next_sk_off", ps, depth, &sk->next_sk_off))
709                 return False;
710         if ( !prs_uint32( "ref_count", ps, depth, &sk->ref_count))
711                 return False;
712         if ( !prs_uint32( "size", ps, depth, &sk->size))
713                 return False;
714
715         {
716                 NTSTATUS status;
717                 TALLOC_CTX *mem_ctx = prs_get_mem_context(&hbin->ps);
718                 DATA_BLOB blob;
719
720                 if (MARSHALLING(&hbin->ps)) {
721                         status = marshall_sec_desc(mem_ctx,
722                                                    sk->sec_desc,
723                                                    &blob.data, &blob.length);
724                         if (!NT_STATUS_IS_OK(status))
725                                 return False;
726                         if (!prs_copy_data_in(&hbin->ps, (const char *)blob.data, blob.length))
727                                 return False;
728                 } else {
729                         blob = data_blob_const(prs_data_p(&hbin->ps),
730                                                prs_data_size(&hbin->ps));
731                         status = unmarshall_sec_desc(mem_ctx,
732                                                      blob.data, blob.length,
733                                                      &sk->sec_desc);
734                         if (!NT_STATUS_IS_OK(status))
735                                 return False;
736                         prs_set_offset(&hbin->ps, blob.length);
737                 }
738         }
739
740         end_off = prs_offset( &hbin->ps );
741
742         /* data_size must be divisible by 8 and large enough to hold the original record */
743
744         data_size = ((start_off - end_off) & 0xfffffff8 );
745         if ( data_size > sk->rec_size )
746                 DEBUG(10,("Encountered reused record (0x%x < 0x%x)\n", data_size, sk->rec_size));
747
748         if ( MARSHALLING(&hbin->ps) )
749                 hbin->dirty = True;
750
751         return True;
752 }
753
754 /*******************************************************************
755 *******************************************************************/
756
757 static bool hbin_prs_vk_rec( const char *desc, REGF_HBIN *hbin, int depth, REGF_VK_REC *vk, REGF_FILE *file )
758 {
759         uint32 offset;
760         uint16 name_length;
761         prs_struct *ps = &hbin->ps;
762         uint32 data_size, start_off, end_off;
763
764         prs_debug(ps, depth, desc, "prs_vk_rec");
765         depth++;
766
767         /* backup and get the data_size */
768         
769         if ( !prs_set_offset( &hbin->ps, prs_offset(&hbin->ps)-sizeof(uint32)) )
770                 return False;
771         start_off = prs_offset( &hbin->ps );
772         if ( !prs_uint32( "rec_size", &hbin->ps, depth, &vk->rec_size ))
773                 return False;
774
775         if ( !prs_uint8s( True, "header", ps, depth, (uint8*)vk->header, sizeof( vk->header )) )
776                 return False;
777
778         if ( MARSHALLING(&hbin->ps) )
779                 name_length = strlen(vk->valuename);
780
781         if ( !prs_uint16( "name_length", ps, depth, &name_length ))
782                 return False;
783         if ( !prs_uint32( "data_size", ps, depth, &vk->data_size ))
784                 return False;
785         if ( !prs_uint32( "data_off", ps, depth, &vk->data_off ))
786                 return False;
787         if ( !prs_uint32( "type", ps, depth, &vk->type))
788                 return False;
789         if ( !prs_uint16( "flag", ps, depth, &vk->flag))
790                 return False;
791
792         offset = prs_offset( ps );
793         offset += 2;    /* skip 2 bytes */
794         prs_set_offset( ps, offset );
795
796         /* get the name */
797
798         if ( vk->flag&VK_FLAG_NAME_PRESENT ) {
799
800                 if ( UNMARSHALLING(&hbin->ps) ) {
801                         if ( !(vk->valuename = PRS_ALLOC_MEM( ps, char, name_length+1 )))
802                                 return False;
803                 }
804                 if ( !prs_uint8s( True, "name", ps, depth, (uint8*)vk->valuename, name_length ) )
805                         return False;
806         }
807
808         end_off = prs_offset( &hbin->ps );
809
810         /* get the data if necessary */
811
812         if ( vk->data_size != 0 ) {
813                 bool charmode = False;
814
815                 if ( (vk->type == REG_SZ) || (vk->type == REG_MULTI_SZ) )
816                         charmode = True;
817
818                 /* the data is stored in the offset if the size <= 4 */
819
820                 if ( !(vk->data_size & VK_DATA_IN_OFFSET) ) {
821                         REGF_HBIN *hblock = hbin;
822                         uint32 data_rec_size;
823
824                         if ( UNMARSHALLING(&hbin->ps) ) {
825                                 if ( !(vk->data = PRS_ALLOC_MEM( ps, uint8, vk->data_size) ) )
826                                         return False;
827                         }
828
829                         /* this data can be in another hbin */
830                         if ( !hbin_contains_offset( hbin, vk->data_off ) ) {
831                                 if ( !(hblock = lookup_hbin_block( file, vk->data_off )) )
832                                         return False;
833                         }
834                         if ( !(prs_set_offset( &hblock->ps, (vk->data_off+HBIN_HDR_SIZE-hblock->first_hbin_off)-sizeof(uint32) )) )
835                                 return False;
836
837                         if ( MARSHALLING(&hblock->ps) ) {
838                                 data_rec_size = ( (vk->data_size+sizeof(uint32)) & 0xfffffff8 ) + 8;
839                                 data_rec_size = ( data_rec_size - 1 ) ^ 0xFFFFFFFF;
840                         }
841                         if ( !prs_uint32( "data_rec_size", &hblock->ps, depth, &data_rec_size ))
842                                 return False;
843                         if ( !prs_uint8s( charmode, "data", &hblock->ps, depth, vk->data, vk->data_size) )
844                                 return False;
845
846                         if ( MARSHALLING(&hblock->ps) )
847                                 hblock->dirty = True;
848                 }
849                 else {
850                         if ( !(vk->data = PRS_ALLOC_MEM( ps, uint8, 4 ) ) )
851                                 return False;
852                         SIVAL( vk->data, 0, vk->data_off );
853                 }
854                 
855         }
856
857         /* data_size must be divisible by 8 and large enough to hold the original record */
858
859         data_size = ((start_off - end_off ) & 0xfffffff8 );
860         if ( data_size !=  vk->rec_size )
861                 DEBUG(10,("prs_vk_rec: data_size check failed (0x%x < 0x%x)\n", data_size, vk->rec_size));
862
863         if ( MARSHALLING(&hbin->ps) )
864                 hbin->dirty = True;
865
866         return True;
867 }
868
869 /*******************************************************************
870  read a VK record which is contained in the HBIN block stored 
871  in the prs_struct *ps.
872 *******************************************************************/
873
874 static bool hbin_prs_vk_records( const char *desc, REGF_HBIN *hbin, int depth, REGF_NK_REC *nk, REGF_FILE *file )
875 {
876         int i;
877         uint32 record_size;
878
879         prs_debug(&hbin->ps, depth, desc, "prs_vk_records");
880         depth++;
881         
882         /* check if we have anything to do first */
883         
884         if ( nk->num_values == 0 )
885                 return True;
886                 
887         if ( UNMARSHALLING(&hbin->ps) ) {
888                 if ( !(nk->values = PRS_ALLOC_MEM( &hbin->ps, REGF_VK_REC, nk->num_values ) ) )
889                         return False;
890         }
891         
892         /* convert the offset to something relative to this HBIN block */
893         
894         if ( !prs_set_offset( &hbin->ps, nk->values_off+HBIN_HDR_SIZE-hbin->first_hbin_off-sizeof(uint32)) )
895                 return False;
896
897         if ( MARSHALLING( &hbin->ps) ) { 
898                 record_size = ( ( nk->num_values * sizeof(uint32) ) & 0xfffffff8 ) + 8;
899                 record_size = (record_size - 1) ^ 0xFFFFFFFF;
900         }
901
902         if ( !prs_uint32( "record_size", &hbin->ps, depth, &record_size ) )
903                 return False;
904                 
905         for ( i=0; i<nk->num_values; i++ ) {
906                 if ( !prs_uint32( "vk_off", &hbin->ps, depth, &nk->values[i].rec_off ) )
907                         return False;
908         }
909
910         for ( i=0; i<nk->num_values; i++ ) {
911                 REGF_HBIN *sub_hbin = hbin;
912                 uint32 new_offset;
913         
914                 if ( !hbin_contains_offset( hbin, nk->values[i].rec_off ) ) {
915                         sub_hbin = lookup_hbin_block( file, nk->values[i].rec_off );
916                         if ( !sub_hbin ) {
917                                 DEBUG(0,("hbin_prs_vk_records: Failed to find HBIN block containing offset [0x%x]\n", 
918                                         nk->values[i].hbin_off));
919                                 return False;
920                         }
921                 }
922                 
923                 new_offset = nk->values[i].rec_off + HBIN_HDR_SIZE - sub_hbin->first_hbin_off;
924                 if ( !prs_set_offset( &sub_hbin->ps, new_offset ) )
925                         return False;
926                 if ( !hbin_prs_vk_rec( "vk_rec", sub_hbin, depth, &nk->values[i], file ) )
927                         return False;
928         }
929
930         if ( MARSHALLING(&hbin->ps) )
931                 hbin->dirty = True;
932
933
934         return True;
935 }
936
937
938 /*******************************************************************
939 *******************************************************************/
940
941 static REGF_SK_REC* find_sk_record_by_offset( REGF_FILE *file, uint32 offset )
942 {
943         REGF_SK_REC *p_sk;
944         
945         for ( p_sk=file->sec_desc_list; p_sk; p_sk=p_sk->next ) {
946                 if ( p_sk->sk_off == offset ) 
947                         return p_sk;
948         }
949         
950         return NULL;
951 }
952
953 /*******************************************************************
954 *******************************************************************/
955
956 static REGF_SK_REC* find_sk_record_by_sec_desc( REGF_FILE *file, SEC_DESC *sd )
957 {
958         REGF_SK_REC *p;
959
960         for ( p=file->sec_desc_list; p; p=p->next ) {
961                 if ( security_descriptor_equal( p->sec_desc, sd ) )
962                         return p;
963         }
964
965         /* failure */
966
967         return NULL;
968 }
969
970 /*******************************************************************
971 *******************************************************************/
972
973 static bool hbin_prs_key( REGF_FILE *file, REGF_HBIN *hbin, REGF_NK_REC *nk )
974 {
975         int depth = 0;
976         REGF_HBIN *sub_hbin;
977         
978         prs_debug(&hbin->ps, depth, "", "fetch_key");
979         depth++;
980
981         /* get the initial nk record */
982         
983         if ( !prs_nk_rec( "nk_rec", &hbin->ps, depth, nk ))
984                 return False;
985
986         /* fill in values */
987         
988         if ( nk->num_values && (nk->values_off!=REGF_OFFSET_NONE) ) {
989                 sub_hbin = hbin;
990                 if ( !hbin_contains_offset( hbin, nk->values_off ) ) {
991                         sub_hbin = lookup_hbin_block( file, nk->values_off );
992                         if ( !sub_hbin ) {
993                                 DEBUG(0,("hbin_prs_key: Failed to find HBIN block containing value_list_offset [0x%x]\n", 
994                                         nk->values_off));
995                                 return False;
996                         }
997                 }
998                 
999                 if ( !hbin_prs_vk_records( "vk_rec", sub_hbin, depth, nk, file ))
1000                         return False;
1001         }
1002                 
1003         /* now get subkeys */
1004         
1005         if ( nk->num_subkeys && (nk->subkeys_off!=REGF_OFFSET_NONE) ) {
1006                 sub_hbin = hbin;
1007                 if ( !hbin_contains_offset( hbin, nk->subkeys_off ) ) {
1008                         sub_hbin = lookup_hbin_block( file, nk->subkeys_off );
1009                         if ( !sub_hbin ) {
1010                                 DEBUG(0,("hbin_prs_key: Failed to find HBIN block containing subkey_offset [0x%x]\n", 
1011                                         nk->subkeys_off));
1012                                 return False;
1013                         }
1014                 }
1015                 
1016                 if ( !hbin_prs_lf_records( "lf_rec", sub_hbin, depth, nk ))
1017                         return False;
1018         }
1019
1020         /* get the to the security descriptor.  First look if we have already parsed it */
1021         
1022         if ( (nk->sk_off!=REGF_OFFSET_NONE) && !( nk->sec_desc = find_sk_record_by_offset( file, nk->sk_off )) ) {
1023
1024                 sub_hbin = hbin;
1025                 if ( !hbin_contains_offset( hbin, nk->sk_off ) ) {
1026                         sub_hbin = lookup_hbin_block( file, nk->sk_off );
1027                         if ( !sub_hbin ) {
1028                                 DEBUG(0,("hbin_prs_key: Failed to find HBIN block containing sk_offset [0x%x]\n", 
1029                                         nk->subkeys_off));
1030                                 return False;
1031                         }
1032                 }
1033                 
1034                 if ( !(nk->sec_desc = TALLOC_ZERO_P( file->mem_ctx, REGF_SK_REC )) )
1035                         return False;
1036                 nk->sec_desc->sk_off = nk->sk_off;
1037                 if ( !hbin_prs_sk_rec( "sk_rec", sub_hbin, depth, nk->sec_desc ))
1038                         return False;
1039                         
1040                 /* add to the list of security descriptors (ref_count has been read from the files) */
1041
1042                 nk->sec_desc->sk_off = nk->sk_off;
1043                 DLIST_ADD( file->sec_desc_list, nk->sec_desc );
1044         }
1045                 
1046         return True;
1047 }
1048
1049 /*******************************************************************
1050 *******************************************************************/
1051
1052 static bool next_record( REGF_HBIN *hbin, const char *hdr, bool *eob )
1053 {
1054         uint8 header[REC_HDR_SIZE];
1055         uint32 record_size;
1056         uint32 curr_off, block_size;
1057         bool found = False;
1058         prs_struct *ps = &hbin->ps;
1059         
1060         curr_off = prs_offset( ps );
1061         if ( curr_off == 0 )
1062                 prs_set_offset( ps, HBIN_HEADER_REC_SIZE );
1063
1064         /* assume that the current offset is at the record header 
1065            and we need to backup to read the record size */
1066
1067         curr_off -= sizeof(uint32);
1068
1069         block_size = prs_data_size( ps );
1070         record_size = 0;
1071         memset( header, 0x0, sizeof(uint8)*REC_HDR_SIZE );
1072         while ( !found ) {
1073
1074                 curr_off = curr_off+record_size;
1075                 if ( curr_off >= block_size ) 
1076                         break;
1077
1078                 if ( !prs_set_offset( &hbin->ps, curr_off) )
1079                         return False;
1080
1081                 if ( !prs_uint32( "record_size", ps, 0, &record_size ) )
1082                         return False;
1083                 if ( !prs_uint8s( True, "header", ps, 0, header, REC_HDR_SIZE ) )
1084                         return False;
1085
1086                 if ( record_size & 0x80000000 ) {
1087                         /* absolute_value(record_size) */
1088                         record_size = (record_size ^ 0xffffffff) + 1;
1089                 }
1090
1091                 if ( memcmp( header, hdr, REC_HDR_SIZE ) == 0 ) {
1092                         found = True;
1093                         curr_off += sizeof(uint32);
1094                 }
1095         } 
1096
1097         /* mark prs_struct as done ( at end ) if no more SK records */
1098         /* mark end-of-block as True */
1099         
1100         if ( !found ) {
1101                 prs_set_offset( &hbin->ps, prs_data_size(&hbin->ps) );
1102                 *eob = True;
1103                 return False;
1104         }
1105                 
1106         if ( !prs_set_offset( ps, curr_off ) )
1107                 return False;
1108
1109         return True;
1110 }
1111
1112 /*******************************************************************
1113 *******************************************************************/
1114
1115 static bool next_nk_record( REGF_FILE *file, REGF_HBIN *hbin, REGF_NK_REC *nk, bool *eob )
1116 {
1117         if ( next_record( hbin, "nk", eob ) && hbin_prs_key( file, hbin, nk ) )
1118                 return True;
1119         
1120         return False;
1121 }
1122
1123 /*******************************************************************
1124  Intialize the newly created REGF_BLOCK in *file and write the 
1125  block header to disk 
1126 *******************************************************************/
1127
1128 static bool init_regf_block( REGF_FILE *file )
1129 {       
1130         prs_struct ps;
1131         bool result = True;
1132         
1133         if ( !prs_init( &ps, REGF_BLOCKSIZE, file->mem_ctx, MARSHALL ) )
1134                 return False;
1135                 
1136         memcpy( file->header, "regf", REGF_HDR_SIZE );
1137         file->data_offset = 0x20;
1138         file->last_block  = 0x1000;
1139         
1140         /* set mod time */
1141         
1142         unix_to_nt_time( &file->mtime, time(NULL) );
1143         
1144         /* hard coded values...no diea what these are ... maybe in time */
1145         
1146         file->unknown1 = 0x2;
1147         file->unknown2 = 0x1;
1148         file->unknown3 = 0x3;
1149         file->unknown4 = 0x0;
1150         file->unknown5 = 0x1;
1151         file->unknown6 = 0x1;
1152         
1153         /* write header to the buffer */
1154         
1155         if ( !prs_regf_block( "regf_header", &ps, 0, file ) ) {
1156                 result = False;
1157                 goto out;
1158         }
1159         
1160         /* calculate the checksum, re-marshall data (to include the checksum) 
1161            and write to disk */
1162         
1163         file->checksum = regf_block_checksum( &ps );
1164         prs_set_offset( &ps, 0 );
1165         if ( !prs_regf_block( "regf_header", &ps, 0, file ) ) {
1166                 result = False;
1167                 goto out;
1168         }
1169                 
1170         if ( write_block( file, &ps, 0 ) == -1 ) {
1171                 DEBUG(0,("init_regf_block: Failed to initialize registry header block!\n"));
1172                 result = False;
1173                 goto out;
1174         }
1175         
1176 out:
1177         prs_mem_free( &ps );
1178
1179         return result;
1180 }
1181 /*******************************************************************
1182  Open the registry file and then read in the REGF block to get the 
1183  first hbin offset.
1184 *******************************************************************/
1185
1186  REGF_FILE* regfio_open( const char *filename, int flags, int mode )
1187 {
1188         REGF_FILE *rb;
1189         
1190         if ( !(rb = SMB_MALLOC_P(REGF_FILE)) ) {
1191                 DEBUG(0,("ERROR allocating memory\n"));
1192                 return NULL;
1193         }
1194         ZERO_STRUCTP( rb );
1195         rb->fd = -1;
1196         
1197         if ( !(rb->mem_ctx = talloc_init( "read_regf_block" )) ) {
1198                 regfio_close( rb );
1199                 return NULL;
1200         }
1201
1202         rb->open_flags = flags;
1203         
1204         /* open and existing file */
1205
1206         if ( (rb->fd = open(filename, flags, mode)) == -1 ) {
1207                 DEBUG(0,("regfio_open: failure to open %s (%s)\n", filename, strerror(errno)));
1208                 regfio_close( rb );
1209                 return NULL;
1210         }
1211         
1212         /* check if we are creating a new file or overwriting an existing one */
1213                 
1214         if ( flags & (O_CREAT|O_TRUNC) ) {
1215                 if ( !init_regf_block( rb ) ) {
1216                         DEBUG(0,("regfio_open: Failed to read initial REGF block\n"));
1217                         regfio_close( rb );
1218                         return NULL;
1219                 }
1220                 
1221                 /* success */
1222                 return rb;
1223         }
1224         
1225         /* read in an existing file */
1226         
1227         if ( !read_regf_block( rb ) ) {
1228                 DEBUG(0,("regfio_open: Failed to read initial REGF block\n"));
1229                 regfio_close( rb );
1230                 return NULL;
1231         }
1232         
1233         /* success */
1234         
1235         return rb;
1236 }
1237
1238 /*******************************************************************
1239 *******************************************************************/
1240
1241 static void regfio_mem_free( REGF_FILE *file )
1242 {
1243         /* free any talloc()'d memory */
1244         
1245         if ( file && file->mem_ctx )
1246                 talloc_destroy( file->mem_ctx );        
1247 }
1248
1249 /*******************************************************************
1250 *******************************************************************/
1251
1252  int regfio_close( REGF_FILE *file )
1253 {
1254         int fd;
1255
1256         /* cleanup for a file opened for write */
1257
1258         if ((file->fd != -1) && (file->open_flags & (O_WRONLY|O_RDWR))) {
1259                 prs_struct ps;
1260                 REGF_SK_REC *sk;
1261
1262                 /* write of sd list */
1263
1264                 for ( sk=file->sec_desc_list; sk; sk=sk->next ) {
1265                         hbin_prs_sk_rec( "sk_rec", sk->hbin, 0, sk );
1266                 }
1267
1268                 /* flush any dirty blocks */
1269
1270                 while ( file->block_list ) {
1271                         hbin_block_close( file, file->block_list );
1272                 } 
1273
1274                 ZERO_STRUCT( ps );
1275
1276                 unix_to_nt_time( &file->mtime, time(NULL) );
1277
1278                 if ( read_block( file, &ps, 0, REGF_BLOCKSIZE ) != -1 ) {
1279                         /* now use for writing */
1280                         prs_switch_type( &ps, MARSHALL );
1281
1282                         /* stream the block once, generate the checksum, 
1283                            and stream it again */
1284                         prs_set_offset( &ps, 0 );
1285                         prs_regf_block( "regf_blocK", &ps, 0, file );
1286                         file->checksum = regf_block_checksum( &ps );
1287                         prs_set_offset( &ps, 0 );
1288                         prs_regf_block( "regf_blocK", &ps, 0, file );
1289
1290                         /* now we are ready to write it to disk */
1291                         if ( write_block( file, &ps, 0 ) == -1 )
1292                                 DEBUG(0,("regfio_close: failed to update the regf header block!\n"));
1293                 }
1294
1295                 prs_mem_free( &ps );
1296         }
1297         
1298         regfio_mem_free( file );
1299
1300         /* nothing tdo do if there is no open file */
1301
1302         if (file->fd == -1)
1303                 return 0;
1304                 
1305         fd = file->fd;
1306         file->fd = -1;
1307         SAFE_FREE( file );
1308
1309         return close( fd );
1310 }
1311
1312 /*******************************************************************
1313 *******************************************************************/
1314
1315 static void regfio_flush( REGF_FILE *file )
1316 {
1317         REGF_HBIN *hbin;
1318
1319         for ( hbin=file->block_list; hbin; hbin=hbin->next ) {
1320                 write_hbin_block( file, hbin );
1321         }
1322 }
1323
1324 /*******************************************************************
1325  There should be only *one* root key in the registry file based 
1326  on my experience.  --jerry
1327 *******************************************************************/
1328
1329 REGF_NK_REC* regfio_rootkey( REGF_FILE *file )
1330 {
1331         REGF_NK_REC *nk;
1332         REGF_HBIN   *hbin;
1333         uint32      offset = REGF_BLOCKSIZE;
1334         bool        found = False;
1335         bool        eob;
1336         
1337         if ( !file )
1338                 return NULL;
1339                 
1340         if ( !(nk = TALLOC_ZERO_P( file->mem_ctx, REGF_NK_REC )) ) {
1341                 DEBUG(0,("regfio_rootkey: talloc() failed!\n"));
1342                 return NULL;
1343         }
1344         
1345         /* scan through the file on HBIN block at a time looking 
1346            for an NK record with a type == 0x002c.
1347            Normally this is the first nk record in the first hbin 
1348            block (but I'm not assuming that for now) */
1349         
1350         while ( (hbin = read_hbin_block( file, offset )) ) {
1351                 eob = False;
1352
1353                 while ( !eob) {
1354                         if ( next_nk_record( file, hbin, nk, &eob ) ) {
1355                                 if ( nk->key_type == NK_TYPE_ROOTKEY ) {
1356                                         found = True;
1357                                         break;
1358                                 }
1359                         }
1360                         prs_mem_free( &hbin->ps );
1361                 }
1362                 
1363                 if ( found ) 
1364                         break;
1365
1366                 offset += hbin->block_size;
1367         }
1368         
1369         if ( !found ) {
1370                 DEBUG(0,("regfio_rootkey: corrupt registry file ?  No root key record located\n"));
1371                 return NULL;
1372         }
1373
1374         DLIST_ADD( file->block_list, hbin );
1375
1376         return nk;              
1377 }
1378
1379 /*******************************************************************
1380  This acts as an interator over the subkeys defined for a given 
1381  NK record.  Remember that offsets are from the *first* HBIN block.
1382 *******************************************************************/
1383
1384  REGF_NK_REC* regfio_fetch_subkey( REGF_FILE *file, REGF_NK_REC *nk )
1385 {
1386         REGF_NK_REC *subkey;
1387         REGF_HBIN   *hbin;
1388         uint32      nk_offset;
1389
1390         /* see if there is anything left to report */
1391         
1392         if ( !nk || (nk->subkeys_off==REGF_OFFSET_NONE) || (nk->subkey_index >= nk->num_subkeys) )
1393                 return NULL;
1394
1395         /* find the HBIN block which should contain the nk record */
1396         
1397         if ( !(hbin = lookup_hbin_block( file, nk->subkeys.hashes[nk->subkey_index].nk_off )) ) {
1398                 DEBUG(0,("hbin_prs_key: Failed to find HBIN block containing offset [0x%x]\n", 
1399                         nk->subkeys.hashes[nk->subkey_index].nk_off));
1400                 return NULL;
1401         }
1402         
1403         nk_offset = nk->subkeys.hashes[nk->subkey_index].nk_off;
1404         if ( !prs_set_offset( &hbin->ps, (HBIN_HDR_SIZE + nk_offset - hbin->first_hbin_off) ) )
1405                 return NULL;
1406                 
1407         nk->subkey_index++;
1408         if ( !(subkey = TALLOC_ZERO_P( file->mem_ctx, REGF_NK_REC )) )
1409                 return NULL;
1410                 
1411         if ( !hbin_prs_key( file, hbin, subkey ) )
1412                 return NULL;
1413         
1414         return subkey;
1415 }
1416
1417
1418 /*******************************************************************
1419 *******************************************************************/
1420
1421 static REGF_HBIN* regf_hbin_allocate( REGF_FILE *file, uint32 block_size )
1422 {
1423         REGF_HBIN *hbin;
1424         SMB_STRUCT_STAT sbuf;
1425
1426         if ( !(hbin = TALLOC_ZERO_P( file->mem_ctx, REGF_HBIN )) )
1427                 return NULL;
1428
1429         memcpy( hbin->header, "hbin", sizeof(HBIN_HDR_SIZE) );
1430
1431
1432         if (sys_fstat(file->fd, &sbuf, false)) {
1433                 DEBUG(0,("regf_hbin_allocate: stat() failed! (%s)\n", strerror(errno)));
1434                 return NULL;
1435         }
1436
1437         hbin->file_off       = sbuf.st_ex_size;
1438
1439         hbin->free_off       = HBIN_HEADER_REC_SIZE;
1440         hbin->free_size      = block_size - hbin->free_off + sizeof(uint32);;
1441
1442         hbin->block_size     = block_size;
1443         hbin->first_hbin_off = hbin->file_off - REGF_BLOCKSIZE;
1444
1445         if ( !prs_init( &hbin->ps, block_size, file->mem_ctx, MARSHALL ) )
1446                 return NULL;
1447
1448         if ( !prs_hbin_block( "new_hbin", &hbin->ps, 0, hbin ) )
1449                 return NULL;
1450
1451         if ( !write_hbin_block( file, hbin ) )
1452                 return NULL;
1453
1454         file->last_block = hbin->file_off;
1455
1456         return hbin;
1457 }
1458
1459 /*******************************************************************
1460 *******************************************************************/
1461
1462 static void update_free_space( REGF_HBIN *hbin, uint32 size_used )
1463 {
1464         hbin->free_off  += size_used;
1465         hbin->free_size -= size_used;
1466
1467         if ( hbin->free_off >= hbin->block_size ) {
1468                 hbin->free_off = REGF_OFFSET_NONE;
1469         }
1470
1471         return;
1472 }
1473
1474 /*******************************************************************
1475 *******************************************************************/
1476
1477 static REGF_HBIN* find_free_space( REGF_FILE *file, uint32 size )
1478 {
1479         REGF_HBIN *hbin, *p_hbin;
1480         uint32 block_off;
1481         bool cached;
1482
1483         /* check open block list */
1484
1485         for ( hbin=file->block_list; hbin!=NULL; hbin=hbin->next ) {
1486                 /* only check blocks that actually have available space */
1487
1488                 if ( hbin->free_off == REGF_OFFSET_NONE )
1489                         continue;
1490
1491                 /* check for a large enough available chunk */
1492
1493                 if ( (hbin->block_size - hbin->free_off) >= size ) {
1494                         DLIST_PROMOTE( file->block_list, hbin );
1495                         goto done;                      
1496                 }
1497         }
1498
1499         /* parse the file until we find a block with 
1500            enough free space; save the last non-filled hbin */
1501
1502         block_off = REGF_BLOCKSIZE;
1503         do {
1504                 /* cleanup before the next round */
1505                 cached = False;
1506                 if ( hbin )
1507                         prs_mem_free( &hbin->ps );
1508
1509                 hbin = read_hbin_block( file, block_off );
1510
1511                 if ( hbin ) {
1512
1513                         /* make sure that we don't already have this block in memory */
1514
1515                         for ( p_hbin=file->block_list; p_hbin!=NULL; p_hbin=p_hbin->next ) {
1516                                 if ( p_hbin->file_off == hbin->file_off ) {
1517                                         cached = True;  
1518                                         break;
1519                                 }
1520                         }
1521
1522                         block_off = hbin->file_off + hbin->block_size;
1523
1524                         if ( cached ) {
1525                                 prs_mem_free( &hbin->ps );
1526                                 hbin = NULL;
1527                                 continue;
1528                         }
1529                 }
1530         /* if (cached block or (new block and not enough free space)) then continue looping */
1531         } while ( cached || (hbin && (hbin->free_size < size)) );
1532         
1533         /* no free space; allocate a new one */
1534
1535         if ( !hbin ) {
1536                 uint32 alloc_size;
1537
1538                 /* allocate in multiples of REGF_ALLOC_BLOCK; make sure (size + hbin_header) fits */
1539
1540                 alloc_size = (((size+HBIN_HEADER_REC_SIZE) / REGF_ALLOC_BLOCK ) + 1 ) * REGF_ALLOC_BLOCK;
1541
1542                 if ( !(hbin = regf_hbin_allocate( file, alloc_size )) ) {
1543                         DEBUG(0,("find_free_space: regf_hbin_allocate() failed!\n"));
1544                         return NULL;
1545                 }
1546                 DLIST_ADD( file->block_list, hbin );
1547         }
1548
1549 done:
1550         /* set the offset to be ready to write */
1551
1552         if ( !prs_set_offset( &hbin->ps, hbin->free_off-sizeof(uint32) ) )
1553                 return NULL;
1554
1555         /* write the record size as a placeholder for now, it should be
1556            probably updated by the caller once it all of the data necessary 
1557            for the record */
1558
1559         if ( !prs_uint32("allocated_size", &hbin->ps, 0, &size) )
1560                 return False;
1561
1562         update_free_space( hbin, size );
1563         
1564         return hbin;
1565 }
1566
1567 /*******************************************************************
1568 *******************************************************************/
1569
1570 static uint32 sk_record_data_size( SEC_DESC * sd )
1571 {
1572         uint32 size, size_mod8;
1573
1574         size_mod8 = 0;
1575
1576         /* the record size is sizeof(hdr) + name + static members + data_size_field */
1577
1578         size = sizeof(uint32)*5 + ndr_size_security_descriptor(sd, NULL, 0) + sizeof(uint32);
1579
1580         /* multiple of 8 */
1581         size_mod8 = size & 0xfffffff8;
1582         if ( size_mod8 < size )
1583                 size_mod8 += 8;
1584
1585         return size_mod8;
1586 }
1587
1588 /*******************************************************************
1589 *******************************************************************/
1590
1591 static uint32 vk_record_data_size( REGF_VK_REC *vk )
1592 {
1593         uint32 size, size_mod8;
1594
1595         size_mod8 = 0;
1596
1597         /* the record size is sizeof(hdr) + name + static members + data_size_field */
1598
1599         size = REC_HDR_SIZE + (sizeof(uint16)*3) + (sizeof(uint32)*3) + sizeof(uint32);
1600
1601         if ( vk->valuename )
1602                 size += strlen(vk->valuename);
1603
1604         /* multiple of 8 */
1605         size_mod8 = size & 0xfffffff8;
1606         if ( size_mod8 < size )
1607                 size_mod8 += 8;
1608
1609         return size_mod8;
1610 }
1611
1612 /*******************************************************************
1613 *******************************************************************/
1614
1615 static uint32 lf_record_data_size( uint32 num_keys )
1616 {
1617         uint32 size, size_mod8;
1618
1619         size_mod8 = 0;
1620
1621         /* the record size is sizeof(hdr) + num_keys + sizeof of hash_array + data_size_uint32 */
1622
1623         size = REC_HDR_SIZE + sizeof(uint16) + (sizeof(REGF_HASH_REC) * num_keys) + sizeof(uint32);
1624
1625         /* multiple of 8 */
1626         size_mod8 = size & 0xfffffff8;
1627         if ( size_mod8 < size )
1628                 size_mod8 += 8;
1629
1630         return size_mod8;
1631 }
1632
1633 /*******************************************************************
1634 *******************************************************************/
1635
1636 static uint32 nk_record_data_size( REGF_NK_REC *nk )
1637 {
1638         uint32 size, size_mod8;
1639
1640         size_mod8 = 0;
1641
1642         /* the record size is static + length_of_keyname + length_of_classname + data_size_uint32 */
1643
1644         size = 0x4c + strlen(nk->keyname) + sizeof(uint32);
1645
1646         if ( nk->classname )
1647                 size += strlen( nk->classname );
1648
1649         /* multiple of 8 */
1650         size_mod8 = size & 0xfffffff8;
1651         if ( size_mod8 < size )
1652                 size_mod8 += 8;
1653
1654         return size_mod8;
1655 }
1656
1657 /*******************************************************************
1658 *******************************************************************/
1659
1660 static bool create_vk_record(REGF_FILE *file, REGF_VK_REC *vk,
1661                              struct regval_blob *value)
1662 {
1663         char *name = regval_name(value);
1664         REGF_HBIN *data_hbin;
1665
1666         ZERO_STRUCTP( vk );
1667
1668         memcpy( vk->header, "vk", REC_HDR_SIZE );
1669
1670         if ( name ) {
1671                 vk->valuename = talloc_strdup( file->mem_ctx, regval_name(value) );
1672                 vk->flag = VK_FLAG_NAME_PRESENT;
1673         }
1674
1675         vk->data_size = regval_size( value );
1676         vk->type      = regval_type( value );
1677
1678         if ( vk->data_size > sizeof(uint32) ) {
1679                 uint32 data_size = ( (vk->data_size+sizeof(uint32)) & 0xfffffff8 ) + 8;
1680
1681                 vk->data = (uint8 *)TALLOC_MEMDUP( file->mem_ctx,
1682                                                    regval_data_p(value),
1683                                                    vk->data_size );
1684                 if (vk->data == NULL) {
1685                         return False;
1686                 }
1687
1688                 /* go ahead and store the offset....we'll pick this hbin block back up when 
1689                    we stream the data */
1690
1691                 if ((data_hbin = find_free_space(file, data_size )) == NULL) {
1692                         return False;
1693                 }
1694                 vk->data_off = prs_offset( &data_hbin->ps ) + data_hbin->first_hbin_off - HBIN_HDR_SIZE;
1695         }
1696         else {
1697                 /* make sure we don't try to copy from a NULL value pointer */
1698
1699                 if ( vk->data_size != 0 ) 
1700                         memcpy( &vk->data_off, regval_data_p(value), sizeof(uint32) );
1701                 vk->data_size |= VK_DATA_IN_OFFSET;             
1702         }
1703
1704         return True;
1705 }
1706
1707 /*******************************************************************
1708 *******************************************************************/
1709
1710 static int hashrec_cmp( REGF_HASH_REC *h1, REGF_HASH_REC *h2 )
1711 {
1712         return StrCaseCmp( h1->fullname, h2->fullname );
1713 }
1714
1715 /*******************************************************************
1716 *******************************************************************/
1717
1718  REGF_NK_REC* regfio_write_key( REGF_FILE *file, const char *name,
1719                                struct regval_ctr *values, struct regsubkey_ctr *subkeys,
1720                                SEC_DESC *sec_desc, REGF_NK_REC *parent )
1721 {
1722         REGF_NK_REC *nk;
1723         REGF_HBIN *vlist_hbin = NULL;
1724         uint32 size;
1725
1726         if ( !(nk = TALLOC_ZERO_P( file->mem_ctx, REGF_NK_REC )) )
1727                 return NULL;
1728
1729         memcpy( nk->header, "nk", REC_HDR_SIZE );
1730
1731         if ( !parent )
1732                 nk->key_type = NK_TYPE_ROOTKEY;
1733         else
1734                 nk->key_type = NK_TYPE_NORMALKEY;
1735
1736         /* store the parent offset (or -1 if a the root key */
1737
1738         nk->parent_off = parent ? (parent->hbin_off + parent->hbin->file_off - REGF_BLOCKSIZE - HBIN_HDR_SIZE ) : REGF_OFFSET_NONE;
1739
1740         /* no classname currently */
1741
1742         nk->classname_off = REGF_OFFSET_NONE;
1743         nk->classname = NULL;
1744         nk->keyname = talloc_strdup( file->mem_ctx, name );
1745
1746         /* current modification time */
1747
1748         unix_to_nt_time( &nk->mtime, time(NULL) );
1749
1750         /* allocate the record on disk */
1751
1752         size = nk_record_data_size( nk );
1753         nk->rec_size = ( size - 1 ) ^ 0XFFFFFFFF;
1754         if ((nk->hbin = find_free_space( file, size )) == NULL) {
1755                 return NULL;
1756         }
1757         nk->hbin_off = prs_offset( &nk->hbin->ps );
1758
1759         /* Update the hash record in the parent */
1760         
1761         if ( parent ) {
1762                 REGF_HASH_REC *hash = &parent->subkeys.hashes[parent->subkey_index];
1763
1764                 hash->nk_off = prs_offset( &nk->hbin->ps ) + nk->hbin->first_hbin_off - HBIN_HDR_SIZE;
1765                 memcpy( hash->keycheck, name, sizeof(uint32) );
1766                 hash->fullname = talloc_strdup( file->mem_ctx, name );
1767                 parent->subkey_index++;
1768
1769                 /* sort the list by keyname */
1770
1771                 qsort( parent->subkeys.hashes, parent->subkey_index, sizeof(REGF_HASH_REC), QSORT_CAST hashrec_cmp );
1772
1773                 if ( !hbin_prs_lf_records( "lf_rec", parent->subkeys.hbin, 0, parent ) )
1774                         return False;
1775         }
1776
1777         /* write the security descriptor */
1778
1779         nk->sk_off = REGF_OFFSET_NONE;
1780         if ( sec_desc ) {
1781                 uint32 sk_size = sk_record_data_size( sec_desc );
1782                 REGF_HBIN *sk_hbin;
1783
1784                 /* search for it in the existing list of sd's */
1785
1786                 if ( (nk->sec_desc = find_sk_record_by_sec_desc( file, sec_desc )) == NULL ) {
1787                         /* not found so add it to the list */
1788
1789                         if (!(sk_hbin = find_free_space( file, sk_size ))) {
1790                                 return NULL;
1791                         }
1792
1793                         if ( !(nk->sec_desc = TALLOC_ZERO_P( file->mem_ctx, REGF_SK_REC )) )
1794                                 return NULL;
1795         
1796                         /* now we have to store the security descriptor in the list and 
1797                            update the offsets */
1798
1799                         memcpy( nk->sec_desc->header, "sk", REC_HDR_SIZE );
1800                         nk->sec_desc->hbin      = sk_hbin;
1801                         nk->sec_desc->hbin_off  = prs_offset( &sk_hbin->ps );
1802                         nk->sec_desc->sk_off    = prs_offset( &sk_hbin->ps ) + sk_hbin->first_hbin_off - HBIN_HDR_SIZE;
1803                         nk->sec_desc->rec_size  = (sk_size-1)  ^ 0xFFFFFFFF;
1804
1805                         nk->sec_desc->sec_desc  = sec_desc;
1806                         nk->sec_desc->ref_count = 0;
1807                         
1808                         /* size value must be self-inclusive */
1809                         nk->sec_desc->size      = ndr_size_security_descriptor(sec_desc, NULL, 0)
1810                                 + sizeof(uint32);
1811
1812                         DLIST_ADD_END( file->sec_desc_list, nk->sec_desc, REGF_SK_REC *);
1813
1814                         /* update the offsets for us and the previous sd in the list.
1815                            if this is the first record, then just set the next and prev
1816                            offsets to ourself. */
1817
1818                         if ( nk->sec_desc->prev ) {
1819                                 REGF_SK_REC *prev = nk->sec_desc->prev;
1820
1821                                 nk->sec_desc->prev_sk_off = prev->hbin_off + prev->hbin->first_hbin_off - HBIN_HDR_SIZE;
1822                                 prev->next_sk_off = nk->sec_desc->sk_off;
1823
1824                                 /* the end must loop around to the front */
1825                                 nk->sec_desc->next_sk_off = file->sec_desc_list->sk_off;
1826
1827                                 /* and first must loop around to the tail */
1828                                 file->sec_desc_list->prev_sk_off = nk->sec_desc->sk_off;
1829                         } else {
1830                                 nk->sec_desc->prev_sk_off = nk->sec_desc->sk_off;
1831                                 nk->sec_desc->next_sk_off = nk->sec_desc->sk_off;
1832                         }
1833                 }
1834
1835                 /* bump the reference count +1 */
1836
1837                 nk->sk_off = nk->sec_desc->sk_off;
1838                 nk->sec_desc->ref_count++;
1839         }
1840
1841         /* write the subkeys */
1842
1843         nk->subkeys_off = REGF_OFFSET_NONE;
1844         if ( (nk->num_subkeys = regsubkey_ctr_numkeys( subkeys )) != 0 ) {
1845                 uint32 lf_size = lf_record_data_size( nk->num_subkeys );
1846                 uint32 namelen;
1847                 int i;
1848                 
1849                 if (!(nk->subkeys.hbin = find_free_space( file, lf_size ))) {
1850                         return NULL;
1851                 }
1852                 nk->subkeys.hbin_off = prs_offset( &nk->subkeys.hbin->ps );
1853                 nk->subkeys.rec_size = (lf_size-1) ^ 0xFFFFFFFF;
1854                 nk->subkeys_off = prs_offset( &nk->subkeys.hbin->ps ) + nk->subkeys.hbin->first_hbin_off - HBIN_HDR_SIZE;
1855
1856                 memcpy( nk->subkeys.header, "lf", REC_HDR_SIZE );
1857                 
1858                 nk->subkeys.num_keys = nk->num_subkeys;
1859                 if (nk->subkeys.num_keys) {
1860                         if ( !(nk->subkeys.hashes = TALLOC_ZERO_ARRAY( file->mem_ctx, REGF_HASH_REC, nk->subkeys.num_keys )) )
1861                                 return NULL;
1862                 } else {
1863                         nk->subkeys.hashes = NULL;
1864                 }
1865                 nk->subkey_index = 0;
1866
1867                 /* update the max_bytes_subkey{name,classname} fields */
1868                 for ( i=0; i<nk->num_subkeys; i++ ) {
1869                         namelen = strlen( regsubkey_ctr_specific_key(subkeys, i) );
1870                         if ( namelen*2 > nk->max_bytes_subkeyname )
1871                                 nk->max_bytes_subkeyname = namelen * 2;
1872                 }
1873         }
1874
1875         /* write the values */
1876
1877         nk->values_off = REGF_OFFSET_NONE;
1878         if ( (nk->num_values = regval_ctr_numvals( values )) != 0 ) {
1879                 uint32 vlist_size = ( ( nk->num_values * sizeof(uint32) ) & 0xfffffff8 ) + 8;
1880                 int i;
1881                 
1882                 if (!(vlist_hbin = find_free_space( file, vlist_size ))) {
1883                         return NULL;
1884                 }
1885                 nk->values_off = prs_offset( &vlist_hbin->ps ) + vlist_hbin->first_hbin_off - HBIN_HDR_SIZE;
1886         
1887                 if (nk->num_values) {
1888                         if ( !(nk->values = TALLOC_ARRAY( file->mem_ctx, REGF_VK_REC, nk->num_values )) )
1889                                 return NULL;
1890                 } else {
1891                         nk->values = NULL;
1892                 }
1893
1894                 /* create the vk records */
1895
1896                 for ( i=0; i<nk->num_values; i++ ) {
1897                         uint32 vk_size, namelen, datalen;
1898                         struct regval_blob *r;
1899
1900                         r = regval_ctr_specific_value( values, i );
1901                         create_vk_record( file, &nk->values[i], r );
1902                         vk_size = vk_record_data_size( &nk->values[i] );
1903                         nk->values[i].hbin = find_free_space( file, vk_size );
1904                         nk->values[i].hbin_off = prs_offset( &nk->values[i].hbin->ps );
1905                         nk->values[i].rec_size = ( vk_size - 1 ) ^ 0xFFFFFFFF;
1906                         nk->values[i].rec_off = prs_offset( &nk->values[i].hbin->ps ) 
1907                                 + nk->values[i].hbin->first_hbin_off 
1908                                 - HBIN_HDR_SIZE;
1909
1910                         /* update the max bytes fields if necessary */
1911
1912                         namelen = strlen( regval_name(r) );
1913                         if ( namelen*2 > nk->max_bytes_valuename )
1914                                 nk->max_bytes_valuename = namelen * 2;
1915
1916                         datalen = regval_size( r );
1917                         if ( datalen > nk->max_bytes_value )
1918                                 nk->max_bytes_value = datalen;
1919                 }
1920         }
1921
1922         /* stream the records */        
1923         
1924         prs_set_offset( &nk->hbin->ps, nk->hbin_off );
1925         if ( !prs_nk_rec( "nk_rec", &nk->hbin->ps, 0, nk ) )
1926                 return False;
1927
1928         if ( nk->num_values ) {
1929                 if ( !hbin_prs_vk_records( "vk_records", vlist_hbin, 0, nk, file ) )
1930                         return False;
1931         }
1932
1933
1934         regfio_flush( file );
1935
1936         return nk;
1937 }
1938