summaryrefslogtreecommitdiff
path: root/source3/utils/editreg.c
blob: 944da3a9fad51ca627f2b25df29013d95e3eddde (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
/* 
   Samba Unix/Linux SMB client utility editreg.c 
   Copyright (C) 2002 Richard Sharpe, rsharpe@richardsharpe.com

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2 of the License, or
   (at your option) any later version.
   
   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.
   
   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  */
 
/*************************************************************************
                                                       
 A utility to edit a Windows NT/2K etc registry file.
                                     
 Many of the ideas in here come from other people and software. 
 I first looked in Wine in misc/registry.c and was also influenced by
 http://www.wednesday.demon.co.uk/dosreg.html

 Which seems to contain comments from someone else. I reproduce them here
 incase the site above disappears. It actually comes from 
 http://home.eunet.no/~pnordahl/ntpasswd/WinReg.txt. 

 The goal here is to read the registry into memory, manipulate it, and then
 write it out if it was changed by any actions of the user.

The windows NT registry has 2 different blocks, where one can occur many
times...

the "regf"-Block
================
 
"regf" is obviosly the abbreviation for "Registry file". "regf" is the
signature of the header-block which is always 4kb in size, although only
the first 64 bytes seem to be used and a checksum is calculated over
the first 0x200 bytes only!

Offset            Size      Contents
0x00000000      D-Word      ID: ASCII-"regf" = 0x66676572
0x00000004      D-Word      ???? //see struct REGF
0x00000008      D-Word      ???? Always the same value as at 0x00000004
0x0000000C      Q-Word      last modify date in WinNT date-format
0x00000014      D-Word      1
0x00000018      D-Word      3
0x0000001C      D-Word      0
0x00000020      D-Word      1
0x00000024      D-Word      Offset of 1st key record
0x00000028      D-Word      Size of the data-blocks (Filesize-4kb)
0x0000002C      D-Word      1
0x000001FC      D-Word      Sum of all D-Words from 0x00000000 to
0x000001FB  //XOR of all words. Nigel

I have analyzed more registry files (from multiple machines running
NT 4.0 german version) and could not find an explanation for the values
marked with ???? the rest of the first 4kb page is not important...

the "hbin"-Block
================
I don't know what "hbin" stands for, but this block is always a multiple
of 4kb in size.

Inside these hbin-blocks the different records are placed. The memory-
management looks like a C-compiler heap management to me...

hbin-Header
===========
Offset      Size      Contents
0x0000      D-Word      ID: ASCII-"hbin" = 0x6E696268
0x0004      D-Word      Offset from the 1st hbin-Block
0x0008      D-Word      Offset to the next hbin-Block
0x001C      D-Word      Block-size

The values in 0x0008 and 0x001C should be the same, so I don't know
if they are correct or swapped...

From offset 0x0020 inside a hbin-block data is stored with the following
format:

Offset      Size      Contents
0x0000      D-Word      Data-block size    //this size must be a
multiple of 8. Nigel
0x0004      ????      Data
 
If the size field is negative (bit 31 set), the corresponding block
is free and has a size of -blocksize!

That does not seem to be true. All block lengths seem to be negative! (Richard Sharpe) 

The data is stored as one record per block. Block size is a multiple
of 4 and the last block reaches the next hbin-block, leaving no room.

Records in the hbin-blocks
==========================

nk-Record

      The nk-record can be treated as a kombination of tree-record and
      key-record of the win 95 registry.

lf-Record

      The lf-record is the counterpart to the RGKN-record (the
      hash-function)

vk-Record

      The vk-record consists information to a single value.

sk-Record

      sk (? Security Key ?) is the ACL of the registry.

Value-Lists

      The value-lists contain information about which values are inside a
      sub-key and don't have a header.

Datas

      The datas of the registry are (like the value-list) stored without a
      header.

All offset-values are relative to the first hbin-block and point to the
block-size field of the record-entry. to get the file offset, you have to add
the header size (4kb) and the size field (4 bytes)...

the nk-Record
=============
Offset      Size      Contents
0x0000      Word      ID: ASCII-"nk" = 0x6B6E
0x0002      Word      for the root-key: 0x2C, otherwise 0x20  //key symbolic links 0x10. Nigel
0x0004      Q-Word      write-date/time in windows nt notation
0x0010      D-Word      Offset of Owner/Parent key
0x0014      D-Word      number of sub-Keys
0x001C      D-Word      Offset of the sub-key lf-Records
0x0024      D-Word      number of values
0x0028      D-Word      Offset of the Value-List
0x002C      D-Word      Offset of the sk-Record

0x0030      D-Word      Offset of the Class-Name //see NK structure for the use of these fields. Nigel
0x0044      D-Word      Unused (data-trash)  //some kind of run time index. Does not appear to be important. Nigel
0x0048      Word      name-length
0x004A      Word      class-name length
0x004C      ????      key-name

the Value-List
==============
Offset      Size      Contents
0x0000      D-Word      Offset 1st Value
0x0004      D-Word      Offset 2nd Value
0x????      D-Word      Offset nth Value

To determine the number of values, you have to look at the owner-nk-record!

Der vk-Record
=============
Offset      Size      Contents
0x0000      Word      ID: ASCII-"vk" = 0x6B76
0x0002      Word      name length
0x0004      D-Word      length of the data   //if top bit is set when offset contains data. Nigel
0x0008      D-Word      Offset of Data
0x000C      D-Word      Type of value
0x0010      Word      Flag
0x0012      Word      Unused (data-trash)
0x0014      ????      Name

If bit 0 of the flag-word is set, a name is present, otherwise the value has no name (=default)

If the data-size is lower 5, the data-offset value is used to store the data itself!

The data-types
==============
Wert      Beteutung
0x0001      RegSZ:             character string (in UNICODE!)
0x0002      ExpandSZ:   string with "%var%" expanding (UNICODE!)
0x0003      RegBin:           raw-binary value
0x0004      RegDWord:   Dword
0x0007      RegMultiSZ:      multiple strings, seperated with 0
                  (UNICODE!)

The "lf"-record
===============
Offset      Size      Contents
0x0000      Word      ID: ASCII-"lf" = 0x666C
0x0002      Word      number of keys
0x0004      ????      Hash-Records

Hash-Record
===========
Offset      Size      Contents
0x0000      D-Word      Offset of corresponding "nk"-Record
0x0004      D-Word      ASCII: the first 4 characters of the key-name, padded with 0's. Case sensitiv!

Keep in mind, that the value at 0x0004 is used for checking the data-consistency! If you change the 
key-name you have to change the hash-value too!

//These hashrecords must be sorted low to high within the lf record. Nigel.

The "sk"-block
==============
(due to the complexity of the SAM-info, not clear jet)
(This is just a security descriptor in the data. R Sharpe.) 


Offset      Size      Contents
0x0000      Word      ID: ASCII-"sk" = 0x6B73
0x0002      Word      Unused
0x0004      D-Word      Offset of previous "sk"-Record
0x0008      D-Word      Offset of next "sk"-Record
0x000C      D-Word      usage-counter
0x0010      D-Word      Size of "sk"-record in bytes
????                                             //standard self
relative security desciptor. Nigel
????  ????      Security and auditing settings...
????

The usage counter counts the number of references to this
"sk"-record. You can use one "sk"-record for the entire registry!

Windows nt date/time format
===========================
The time-format is a 64-bit integer which is incremented every
0,0000001 seconds by 1 (I don't know how accurate it realy is!)
It starts with 0 at the 1st of january 1601 0:00! All values are
stored in GMT time! The time-zone is important to get the real
time!

Common values for win95 and win-nt
==================================
Offset values marking an "end of list", are either 0 or -1 (0xFFFFFFFF).
If a value has no name (length=0, flag(bit 0)=0), it is treated as the
"Default" entry...
If a value has no data (length=0), it is displayed as empty.

simplyfied win-3.?? registry:
=============================

+-----------+
| next rec. |---+                      +----->+------------+
| first sub |   |                      |      | Usage cnt. |
| name      |   |  +-->+------------+  |      | length     |
| value     |   |  |   | next rec.  |  |      | text       |------->+-------+
+-----------+   |  |   | name rec.  |--+      +------------+        | xxxxx |
   +------------+  |   | value rec. |-------->+------------+        +-------+
   v               |   +------------+         | Usage cnt. |
+-----------+      |                          | length     |
| next rec. |      |                          | text       |------->+-------+
| first sub |------+                          +------------+        | xxxxx |
| name      |                                                       +-------+
| value     |
+-----------+    

Greatly simplyfied structure of the nt-registry:
================================================
   
+---------------------------------------------------------------+
|                                                               |
v                                                               |
+---------+     +---------->+-----------+  +----->+---------+   |
| "nk"    |     |           | lf-rec.   |  |      | nk-rec. |   |
| ID      |     |           | # of keys |  |      | parent  |---+
| Date    |     |           | 1st key   |--+      | ....    |
| parent  |     |           +-----------+         +---------+
| suk-keys|-----+
| values  |--------------------->+----------+
| SK-rec. |---------------+      | 1. value |--> +----------+
| class   |--+            |      +----------+    | vk-rec.  |
+---------+  |            |                      | ....     |
             v            |                      | data     |--> +-------+
      +------------+      |                      +----------+    | xxxxx |
      | Class name |      |                                      +-------+
      +------------+      |
                          v
          +---------+    +---------+
   +----->| next sk |--->| Next sk |--+
   |  +---| prev sk |<---| prev sk |  |
   |  |   | ....    |    | ...     |  |
   |  |   +---------+    +---------+  |
   |  |                    ^          |
   |  |                    |          |
   |  +--------------------+          |
   +----------------------------------+

---------------------------------------------------------------------------

Hope this helps....  (Although it was "fun" for me to uncover this things,
                  it took me several sleepless nights ;)

            B.D.

*************************************************************************/

#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <assert.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <sys/mman.h>
#include <string.h>
#include <fcntl.h>

static int verbose = 0;

/* 
 * These definitions are for the in-memory registry structure.
 * It is a tree structure that mimics what you see with tools like regedit
 */

/*
 * DateTime struct for Windows
 */

typedef struct date_time_s {
  unsigned int low, high;
} NTTIME;

/*
 * Definition of a Key. It has a name, classname, date/time last modified,
 * sub-keys, values, and a security descriptor
 */

#define REG_ROOT_KEY 1
#define REG_SUB_KEY  2
#define REG_SYM_LINK 3

typedef struct reg_key_s {
  char *name;         /* Name of the key                    */
  char *class_name;
  int type;           /* One of REG_ROOT_KEY or REG_SUB_KEY */
  NTTIME last_mod; /* Time last modified                 */
  struct reg_key_s *owner;
  struct key_list_s *sub_keys;
  struct val_list_s *values;
  struct key_sec_desc_s *security;
} REG_KEY;

/*
 * The KEY_LIST struct lists sub-keys.
 */

typedef struct key_list_s {
  int key_count;
  REG_KEY *keys[1];
} KEY_LIST;

typedef struct val_key_s {
  char *name;
  int has_name;
  int data_type;
  int data_len;
  void *data_blk;    /* Might want a separate block */
} VAL_KEY;

typedef struct val_list_s {
  int val_count;
  VAL_KEY *vals[1];
} VAL_LIST;

#ifndef MAXSUBAUTHS
#define MAXSUBAUTHS 15
#endif

typedef struct dom_sid_s {
  unsigned char ver, auths;
  unsigned char auth[6];
  unsigned int sub_auths[MAXSUBAUTHS];
} DOM_SID;

typedef struct ace_struct_s {
  unsigned char type, flags;
  unsigned int perms;   /* Perhaps a better def is in order */
  DOM_SID trustee;
} ACE; 

typedef struct acl_struct_s {
  unsigned short rev, refcnt;
  unsigned short num_aces;
  ACE *aces[1];
} ACL;

typedef struct sec_desc_s {
  unsigned int rev, type;
  DOM_SID *owner, *group;
  ACL *sacl, *dacl;
} SEC_DESC;

typedef struct key_sec_desc_s {
  struct key_sec_desc_s *prev, *next;
  int ref_cnt;
  SEC_DESC *sec_desc;
} KEY_SEC_DESC; 


/*
 * An API for accessing/creating/destroying items above
 */

/*
 * Iterate over the keys, depth first, calling a function for each key
 * and indicating if it is terminal or non-terminal and if it has values.
 *
 * In addition, for each value in the list, call a value list function
 */

/*
 * There should eventually be one to deal with security keys as well
 */

typedef int (*key_print_f)(char *path, char *key_name, char *class_name, 
			   int root, int terminal, int values);

typedef int (*val_print_f)(char *path, char *val_name, int val_type, 
			   int data_len, void *data_blk, int terminal,
			   int first, int last);

typedef struct regf_struct_s REGF;

int nt_key_iterator(REGF *regf, REG_KEY *key_tree, int bf, char *path, 
		    key_print_f key_print, val_print_f val_print);

int nt_val_list_iterator(REGF *regf, VAL_LIST *val_list, int bf, char *path,
			 int terminal, val_print_f val_print)
{
  int i;

  if (!val_list) return 1;

  if (!val_print) return 1;

  for (i=0; i<val_list->val_count; i++) {
    if (!val_print(path, val_list->vals[i]->name, val_list->vals[i]->data_type,
		   val_list->vals[i]->data_len, val_list->vals[i]->data_blk,
		   terminal,
		   (i == 0),
		   (i == val_list->val_count))) {

      return 0;

    }
  }

  return 1;
}

int nt_key_list_iterator(REGF *regf, KEY_LIST *key_list, int bf, char *path,
			 key_print_f key_print, val_print_f val_print)
{
  int i;

  if (!key_list) return 1;

  for (i=0; i< key_list->key_count; i++) {
    if (!nt_key_iterator(regf, key_list->keys[i], bf, path, key_print, 
			 val_print)) {
      return 0;
    }
  }
  return 1;
}

int nt_key_iterator(REGF *regf, REG_KEY *key_tree, int bf, char *path,
		    key_print_f key_print, val_print_f val_print)
{
  int path_len = strlen(path);
  char *new_path;

  if (!regf || !key_tree)
    return -1;

  /* List the key first, then the values, then the sub-keys */

  if (key_print) {

    if (!(*key_print)(path, key_tree->name, 
		      key_tree->class_name, 
		      (key_tree->type == REG_ROOT_KEY),
		      (key_tree->sub_keys == NULL),
		      (key_tree->values?(key_tree->values->val_count):0)))
      return 0;
  }

  new_path = (char *)malloc(path_len + 1 + strlen(key_tree->name) + 1);
  if (!new_path) return 0; /* Errors? */
  new_path[0] = '\0';
  strcat(new_path, path);
  strcat(new_path, "\\");
  strcat(new_path, key_tree->name);

  /*
   * Now, iterate through the values in the val_list 
   */

  if (key_tree->values &&
      !nt_val_list_iterator(regf, key_tree->values, bf, new_path, 
			    (key_tree->values!=NULL),
			    val_print)) {

    free(new_path);
    return 0;
  } 

  /* 
   * Now, iterate through the keys in the key list
   */

  if (key_tree->sub_keys && 
      !nt_key_list_iterator(regf, key_tree->sub_keys, bf, new_path, key_print, 
			    val_print)) {
    free(new_path);
    return 0;
  } 

  free(new_path);
  return 1;
}

/* Make, delete keys */

int nt_delete_val_list(VAL_LIST *vl)
{

  return 1;
}

int nt_delete_reg_key(REG_KEY *key)
{

  return 1;
}

/* 
 * Create/delete key lists and add delete keys to/from a list, count the keys 
 */


/*
 * Create/delete value lists, add/delete values, count them
 */


/*
 * Create/delete security descriptors, add/delete SIDS, count SIDS, etc.
 * We reference count the security descriptors. Any new reference increments 
 * the ref count. If we modify an SD, we copy the old one, dec the ref count
 * and make the change. We also want to be able to check for equality so
 * we can reduce the number of SDs in use.
 */


/*
 * Load and unload a registry file.
 *
 * Load, loads it into memory as a tree, while unload sealizes/flattens it
 */

/*
 * Get the starting record for NT Registry file 
 */

/* A map of sk offsets in the regf to KEY_SEC_DESCs for quick lookup etc */
typedef struct sk_map_s {
  int sk_off;
  KEY_SEC_DESC *key_sec_desc;
} SK_MAP;

/* 
 * Where we keep all the regf stuff for one registry.
 * This is the structure that we use to tie the in memory tree etc 
 * together. By keeping separate structs, we can operate on different
 * registries at the same time.
 * Currently, the SK_MAP is an array of mapping structure.
 * Since we only need this on input and output, we fill in the structure
 * as we go on input. On output, we know how many SK items we have, so
 * we can allocate the structure as we need to.
 * If you add stuff here that is dynamically allocated, add the 
 * appropriate free statements below.
 */

#define REGF_REGTYPE_NONE 0
#define REGF_REGTYPE_NT   1
#define REGF_REGTYPE_W9X  2

#define TTTONTTIME(r, t1, t2) (r)->last_mod_time.low = (t1); \
                              (r)->last_mod_time.high = (t2);

#define REGF_HDR_BLKSIZ 0x1000 

struct regf_struct_s {
  int reg_type;
  char *regfile_name, *outfile_name;
  int fd;
  struct stat sbuf;
  char *base;
  int modified;
  NTTIME last_mod_time;
  REG_KEY *root;  /* Root of the tree for this file */
  int sk_count, sk_map_size;
  SK_MAP **sk_map;
};

/*
 * Structures for dealing with the on-disk format of the registry
 */

#define IVAL(buf) ((unsigned int) \
                   (unsigned int)*((unsigned char *)(buf)+3)<<24| \
                   (unsigned int)*((unsigned char *)(buf)+2)<<16| \
                   (unsigned int)*((unsigned char *)(buf)+1)<<8| \
                   (unsigned int)*((unsigned char *)(buf)+0)) 

#define SVAL(buf) ((unsigned short) \
                   (unsigned short)*((unsigned char *)(buf)+1)<<8| \
                   (unsigned short)*((unsigned char *)(buf)+0)) 

#define OFF(f) ((f) + REGF_HDR_BLKSIZ + 4) 
#define LOCN(base, f) ((base) + OFF(f))

/* 
 * All of the structures below actually have a four-byte lenght before them
 * which always seems to be negative. The following macro retrieves that
 * size as an integer
 */

#define BLK_SIZE(b) ((int)*(int *)(((int *)b)-1))

typedef unsigned int DWORD;
typedef unsigned short WORD;

#define REG_REGF_ID 0x66676572

typedef struct regf_block {
  DWORD REGF_ID;     /* regf */
  DWORD uk1;
  DWORD uk2;
  DWORD tim1, tim2;
  DWORD uk3;             /* 1 */
  DWORD uk4;             /* 3 */
  DWORD uk5;             /* 0 */
  DWORD uk6;             /* 1 */
  DWORD first_key;       /* offset */
  unsigned int dblk_size;
  DWORD uk7[116];        /* 1 */
  DWORD chksum;
} REGF_HDR;

typedef struct hbin_sub_struct {
  DWORD dblocksize;
  char data[1];
} HBIN_SUB_HDR;

#define REG_HBIN_ID 0x6E696268

typedef struct hbin_struct {
  DWORD HBIN_ID; /* hbin */
  DWORD next_off;
  DWORD prev_off;
  DWORD uk1;
  DWORD uk2;
  DWORD uk3;
  DWORD uk4;
  DWORD blk_size;
  HBIN_SUB_HDR hbin_sub_hdr;
} HBIN_HDR;

#define REG_NK_ID 0x6B6E

typedef struct nk_struct {
  WORD NK_ID;
  WORD type;
  DWORD t1, t2;
  DWORD uk1;
  DWORD own_off;
  DWORD subk_num;
  DWORD uk2;
  DWORD lf_off;
  DWORD uk3;
  DWORD val_cnt;
  DWORD val_off;
  DWORD sk_off;
  DWORD clsnam_off;
  DWORD unk4[4];
  DWORD unk5;
  WORD nam_len;
  WORD clsnam_len;
  char key_nam[1];  /* Actual length determined by nam_len */
} NK_HDR;

#define REG_SK_ID 0x6B73

typedef struct sk_struct {
  WORD SK_ID;
  WORD uk1;
  DWORD prev_off;
  DWORD next_off;
  DWORD ref_cnt;
  DWORD rec_size;
  char sec_desc[1];
} SK_HDR;

typedef struct hash_struct {
  DWORD nk_off;
  char hash[4];
} HASH_REC;

#define REG_LF_ID 0x666C

typedef struct lf_struct {
  WORD LF_ID;
  WORD key_count;
  struct hash_struct hr[1];  /* Array of hash records, depending on key_count */
} LF_HDR;

typedef DWORD VL_TYPE[1];  /* Value list is an array of vk rec offsets */

#define REG_VK_ID 0x6B76

typedef struct vk_struct {
  WORD VK_ID;
  WORD nam_len;
  DWORD dat_len;    /* If top-bit set, offset contains the data */
  DWORD dat_off;   
  DWORD dat_type;
  WORD flag;        /* =1, has name, else no name (=Default). */
  WORD unk1;
  char dat_name[1]; /* Name starts here ... */
} VK_HDR;

#define REG_TYPE_REGSZ     1
#define REG_TYPE_EXPANDSZ  2
#define REG_TYPE_BIN       3  
#define REG_TYPE_DWORD     4
#define REG_TYPE_MULTISZ   7

typedef struct _val_str { 
  unsigned int val;
  char * str;
} VAL_STR;

VAL_STR reg_type_names[] = {
   { 1, "REG_SZ" },
   { 2, "REG_EXPAND_SZ" },
   { 3, "REG_BIN" },
   { 4, "REG_DWORD" },
   { 7, "REG_MULTI_SZ" },
   { 0, NULL },
};

char *val_to_str(unsigned int val, VAL_STR *val_array)
{
  int i = 0;

  if (!val_array) return NULL;

  while (val_array[i].val && val_array[i].str) {

    if (val_array[i].val == val) return val_array[i].str;
    i++;

  }

  return NULL;

}

REG_KEY *nt_get_key_tree(REGF *regf, NK_HDR *nk_hdr, int size);

int nt_set_regf_input_file(REGF *regf, char *filename)
{
  return ((regf->regfile_name = strdup(filename)) != NULL); 
}

int nt_set_regf_output_file(REGF *regf, char *filename)
{
  return ((regf->outfile_name = strdup(filename)) != NULL); 
}

/* Create a regf structure and init it */

REGF *nt_create_regf(void)
{
  REGF *tmp = (REGF *)malloc(sizeof(REGF));
  if (!tmp) return tmp;
  bzero(tmp, sizeof(REGF));
  return tmp;
} 

/* Free all the bits and pieces ... Assumes regf was malloc'd */
/* If you add stuff to REGF, add the relevant free bits here  */
int nt_free_regf(REGF *regf)
{
  if (!regf) return 0;

  if (regf->regfile_name) free(regf->regfile_name);
  if (regf->outfile_name) free(regf->outfile_name);

  /* Free the mmap'd area */

  if (regf->base) munmap(regf->base, regf->sbuf.st_size);
  regf->base = NULL;
  close(regf->fd);    /* Ignore the error :-) */

  nt_delete_reg_key(regf->root); /* Free the tree */
  free(regf->sk_map);
  regf->sk_count = regf->sk_map_size = 0;

  free(regf);

  return 1;
}

/*
 * Convert from UniCode to Ascii ... Does not take into account other lang
 * Restrict by ascii_max if > 0
 */
int uni_to_ascii(unsigned char *uni, unsigned char *ascii, int ascii_max, 
		 int uni_max)
{
  int i = 0; 

  while (i < ascii_max && !(!uni[i*2] && !uni[i*2+1])) {
    if (uni_max > 0 && (i*2) >= uni_max) break;
    ascii[i] = uni[i*2];
    i++;

  }

  ascii[i] = '\0';

  return i;
}

/* Get the header of the registry. Return a pointer to the structure 
 * If the mmap'd area has not been allocated, then mmap the input file
 */
REGF_HDR *nt_get_regf_hdr(REGF *regf)
{
  if (!regf)
    return NULL; /* What about errors */

  if (!regf->regfile_name)
    return NULL; /* What about errors */

  if (!regf->base) { /* Try to mmap etc the file */

    if ((regf->fd = open(regf->regfile_name, O_RDONLY, 0000)) <0) {
      return NULL; /* What about errors? */
    }

    if (fstat(regf->fd, &regf->sbuf) < 0) {
      return NULL;
    }

    regf->base = mmap(0, regf->sbuf.st_size, PROT_READ, MAP_SHARED, regf->fd, 0);

    if ((int)regf->base == 1) {
      fprintf(stderr, "Could not mmap file: %s, %s\n", regf->regfile_name,
	      strerror(errno));
      return NULL;
    }
  }

  /* 
   * At this point, regf->base != NULL, and we should be able to read the 
   * header 
   */

  assert(regf->base != NULL);

  return (REGF_HDR *)regf->base;
}

/*
 * Validate a regf header
 * For now, do nothing, but we should check the checksum
 */
int valid_regf_hdr(REGF_HDR *regf_hdr)
{
  if (!regf_hdr) return 0;

  return 1;
}

/*
 * Process a VK header and return a value
 */
VAL_KEY *process_vk(REGF *regf, VK_HDR *vk_hdr, int size)
{
  char val_name[1024];
  int nam_len, dat_len, flag, dat_type, dat_off, vk_id;
  char *val_type;
  VAL_KEY *tmp = NULL; 

  if (!vk_hdr) return NULL;

  if ((vk_id = SVAL(&vk_hdr->VK_ID)) != REG_VK_ID) {
    fprintf(stderr, "Unrecognized VK header ID: %0X, block: %0X, %s\n",
	    vk_id, (int)vk_hdr, regf->regfile_name);
    return NULL;
  }

  nam_len = SVAL(&vk_hdr->nam_len);
  val_name[nam_len] = '\0';
  flag = SVAL(&vk_hdr->flag);
  dat_type = IVAL(&vk_hdr->dat_type);
  dat_len = IVAL(&vk_hdr->dat_len);  /* If top bit, offset contains data */
  dat_off = IVAL(&vk_hdr->dat_off);

  tmp = (VAL_KEY *)malloc(sizeof(VAL_KEY));
  if (!tmp) {
    goto error;
  }
  bzero(tmp, sizeof(VAL_KEY));
  tmp->has_name = flag;
  tmp->data_type = dat_type;

  if (flag & 0x01) {
    strncpy(val_name, vk_hdr->dat_name, nam_len);
    tmp->name = strdup(val_name);
    if (!tmp->name) {
      goto error;
    }
  }
  else
    strncpy(val_name, "<No Name>", 10);

  /*
   * Allocate space and copy the data as a BLOB
   */

  if (dat_len) {
    
    char *dtmp = (char *)malloc(dat_len&0x7FFFFFFF);
    
    if (!dtmp) {
      goto error;
    }

    tmp->data_blk = dtmp;

    if ((dat_len&0x80000000) == 0) { /* The data is pointed to by the offset */
      char *dat_ptr = LOCN(regf->base, dat_off);
      bcopy(dat_ptr, dtmp, dat_len);
    }
    else { /* The data is in the offset */
      dat_len = dat_len & 0x7FFFFFFF;
      bcopy(&dat_off, dtmp, dat_len);
    }

  }

  val_type = val_to_str(dat_type, reg_type_names);

  /*
   * We need to save the data area as well
   */

  if (verbose) fprintf(stdout, "  %s : %s : \n", val_name, val_type);

  return tmp;

 error:
  /* XXX: FIXME, free the partially allocated struct */
  return NULL;

}

/*
 * Process a VL Header and return a list of values
 */
VAL_LIST *process_vl(REGF *regf, VL_TYPE vl, int count, int size)
{
  int i, vk_off;
  VK_HDR *vk_hdr;
  VAL_LIST *tmp = NULL;

  if (-size < (count+1)*sizeof(int)){
    fprintf(stderr, "Error in VL header format. Size less than space required. %d\n", -size);
    return NULL;
  }

  tmp = (VAL_LIST *)malloc(sizeof(VAL_LIST) + (count - 1) * sizeof(VAL_KEY *));
  if (!tmp) {
    goto error;
  }

  for (i=0; i<count; i++) {
    vk_off = IVAL(&vl[i]);
    vk_hdr = (VK_HDR *)LOCN(regf->base, vk_off);
    tmp->vals[i] = process_vk(regf, vk_hdr, BLK_SIZE(vk_hdr));
    if (!tmp->vals[i]){
      goto error;
    }
  }

  tmp->val_count = count;

  return tmp;

 error:
  /* XXX: FIXME, free the partially allocated structure */
  return NULL;
} 

/*
 * Process an LF Header and return a list of sub-keys
 */
KEY_LIST *process_lf(REGF *regf, LF_HDR *lf_hdr, int size)
{
  int count, i, nk_off;
  unsigned int lf_id;
  KEY_LIST *tmp;

  if (!lf_hdr) return NULL;

  if ((lf_id = SVAL(&lf_hdr->LF_ID)) != REG_LF_ID) {
    fprintf(stderr, "Unrecognized LF Header format: %0X, Block: %0X, %s.\n",
	    lf_id, (int)lf_hdr, regf->regfile_name);
    return NULL;
  }

  assert(size < 0);

  count = SVAL(&lf_hdr->key_count);

  if (count <= 0) return NULL;

  /* Now, we should allocate a KEY_LIST struct and fill it in ... */

  tmp = (KEY_LIST *)malloc(sizeof(KEY_LIST) + (count - 1) * sizeof(REG_KEY *));
  if (!tmp) {
    goto error;
  }

  tmp->key_count = count;

  for (i=0; i<count; i++) {
    NK_HDR *nk_hdr;

    nk_off = IVAL(&lf_hdr->hr[i].nk_off);
    nk_hdr = (NK_HDR *)LOCN(regf->base, nk_off);
    tmp->keys[i] = nt_get_key_tree(regf, nk_hdr, BLK_SIZE(nk_hdr));
    if (!tmp->keys[i]) {
      goto error;
    }
  }

  return tmp;

 error:
  /* XXX: FIXME, free the partially allocated structure */
  return NULL;
}

/*
 * This routine is passed a NK_HDR pointer and retrieves the entire tree
 * from there down. It return a REG_KEY *.
 */
REG_KEY *nt_get_key_tree(REGF *regf, NK_HDR *nk_hdr, int size)
{
  REG_KEY *tmp = NULL;
  int name_len, clsname_len, lf_off, val_off, val_count, sk_off;
  unsigned int nk_id;
  LF_HDR *lf_hdr;
  VL_TYPE *vl;
  SK_HDR *sk_hdr;
  char key_name[1024], cls_name[1024];

  if (!nk_hdr) return NULL;

  if ((nk_id = SVAL(&nk_hdr->NK_ID)) != REG_NK_ID) {
    fprintf(stderr, "Unrecognized NK Header format: %08X, Block: %0X. %s\n", 
	    nk_id, (int)nk_hdr, regf->regfile_name);
    return NULL;
  }

  assert(size < 0);

  name_len = SVAL(&nk_hdr->nam_len);
  clsname_len = SVAL(&nk_hdr->clsnam_len);

  /*
   * The value of -size should be ge 
   * (sizeof(NK_HDR) - 1 + name_len)
   * The -1 accounts for the fact that we included the first byte of 
   * the name in the structure. clsname_len is the length of the thing 
   * pointed to by clsnam_off
   */

  if (-size < (sizeof(NK_HDR) - 1 + name_len)) {
    fprintf(stderr, "Incorrect NK_HDR size: %d, %0X\n", -size, (int)nk_hdr);
    fprintf(stderr, "Sizeof NK_HDR: %d, name_len %d, clsname_len %d\n",
	    sizeof(NK_HDR), name_len, clsname_len);
    /*return NULL;*/
  }

  if (verbose) fprintf(stdout, "NK HDR: Name len: %d, class name len: %d\n", 
		       name_len, clsname_len);

  /* Fish out the key name and process the LF list */

  assert(name_len < sizeof(key_name));

  /* Allocate the key struct now */
  tmp = (REG_KEY *)malloc(sizeof(REG_KEY));
  if (!tmp) return tmp;
  bzero(tmp, sizeof(REG_KEY));

  tmp->type = (SVAL(&nk_hdr->type)==0x2C?REG_ROOT_KEY:REG_SUB_KEY);
  
  strncpy(key_name, nk_hdr->key_nam, name_len);
  key_name[name_len] = '\0';

  if (verbose) fprintf(stdout, "Key name: %s\n", key_name);

  tmp->name = strdup(key_name);
  if (!tmp->name) {
    goto error;
  }

  /*
   * Fish out the class name, it is in UNICODE, while the key name is 
   * ASCII :-)
   */

  if (clsname_len) { /* Just print in Ascii for now */
    char *clsnamep;
    int clsnam_off;

    clsnam_off = IVAL(&nk_hdr->clsnam_off);
    clsnamep = LOCN(regf->base, clsnam_off);
 
    bzero(cls_name, clsname_len);
    uni_to_ascii(clsnamep, cls_name, sizeof(cls_name), clsname_len);
    
    /*
     * I am keeping class name as an ascii string for the moment.
     * That means it needs to be converted on output.
     * XXX: FIXME
     */

    tmp->class_name = strdup(cls_name);
    if (!tmp->class_name) {
      goto error;
    }

    if (verbose) fprintf(stdout, "  Class Name: %s\n", cls_name);

  }

  /*
   * If there are any values, process them here
   */

  val_count = IVAL(&nk_hdr->val_cnt);

  if (val_count) {

    val_off = IVAL(&nk_hdr->val_off);
    vl = (VL_TYPE *)LOCN(regf->base, val_off);

    tmp->values = process_vl(regf, *vl, val_count, BLK_SIZE(vl));
    if (!tmp->values) {
      goto error;
    }

  }

  /* 
   * Also handle the SK header ...
   */

  sk_off = IVAL(&nk_hdr->sk_off);
  sk_hdr = (SK_HDR *)LOCN(regf->base, sk_off);

  if (sk_off != -1) {

    /* To be coded */  

  } 

  lf_off = IVAL(&nk_hdr->lf_off);

  /*
   * No more subkeys if lf_off == -1
   */

  if (lf_off != -1) {

    lf_hdr = (LF_HDR *)LOCN(regf->base, lf_off);
    
    tmp->sub_keys = process_lf(regf, lf_hdr, BLK_SIZE(lf_hdr));
    if (!tmp->sub_keys){
      goto error;
    }

  }

  return tmp;

 error:
  if (tmp) nt_delete_reg_key(tmp);
  return NULL;
}

int nt_load_registry(REGF *regf)
{
  REGF_HDR *regf_hdr;
  unsigned int regf_id, hbin_id;
  HBIN_HDR *hbin_hdr;
  NK_HDR *first_key;

  /* Get the header */

  if ((regf_hdr = nt_get_regf_hdr(regf)) == NULL) {
    return -1;
  }

  /* Now process that header and start to read the rest in */

  if ((regf_id = IVAL(&regf_hdr->REGF_ID)) != REG_REGF_ID) {
    fprintf(stderr, "Unrecognized NT registry header id: %0X, %s\n",
	    regf_id, regf->regfile_name);
    return -1;
  }

  /*
   * Validate the header ...
   */
  if (!valid_regf_hdr(regf_hdr)) {
    fprintf(stderr, "Registry file header does not validate: %s\n",
	    regf->regfile_name);
    return -1;
  }

  /* Update the last mod date, and then go get the first NK record and on */

  TTTONTTIME(regf, IVAL(&regf_hdr->tim1), IVAL(&regf_hdr->tim2));

  /* 
   * The hbin hdr seems to be just uninteresting garbage. Check that
   * it is there, but that is all.
   */

  hbin_hdr = (HBIN_HDR *)(regf->base + REGF_HDR_BLKSIZ);

  if ((hbin_id = IVAL(&hbin_hdr->HBIN_ID)) != REG_HBIN_ID) {
    fprintf(stderr, "Unrecognized registry hbin hdr ID: %0X, %s\n", 
	    hbin_id, regf->regfile_name);
    return -1;
  } 

  /*
   * Get a pointer to the first key from the hreg_hdr
   */

  first_key = (NK_HDR *)LOCN(regf->base, IVAL(&regf_hdr->first_key));

  /*
   * Now, get the registry tree by processing that NK recursively
   */

  regf->root = nt_get_key_tree(regf, first_key, BLK_SIZE(first_key));

  assert(regf->root != NULL);

  return 1;
}

/*
 * Main code from here on ...
 */

/*
 * key print function here ...
 */

int print_key(char *path, char *name, char *class_name, int root, 
	      int terminal, int vals)
{

  if (terminal) fprintf(stdout, "%s\\%s\n", path, name);

  return 1;
}

/*
 * Value print function here ...
 */
int print_val(char *path, char *val_name, int val_type, int data_len, 
	      void *data_blk, int terminal, int first, int last)
{
  if (!terminal && first)
    fprintf(stdout, "%s\n", path);
  fprintf(stdout, "  %s : %s : \n", (val_name?val_name:"<No Name>"), 
		   val_to_str(val_type, reg_type_names));
  return 1;
}

void usage(void)
{
  fprintf(stderr, "Usage: editreg [-v] [-k] <registryfile>\n");
  fprintf(stderr, "Version: 0.1\n\n");
  fprintf(stderr, "\n\t-v\t sets verbose mode");
}

int main(int argc, char *argv[])
{
  REGF *regf;
  extern char *optarg;
  extern int optind;
  int opt;

  if (argc < 2) {
    usage();
    exit(1);
  }
  
  /* 
   * Now, process the arguments
   */

  while ((opt = getopt(argc, argv, "vk")) != EOF) {
    switch (opt) {
    case 'v':
      verbose++;
      break;

    case 'k':
      break;

    default:
      usage();
      exit(1);
      break;
    }
  }

  if ((regf = nt_create_regf()) == NULL) {
    fprintf(stderr, "Could not create registry object: %s\n", strerror(errno));
    exit(2);
  }

  if (!nt_set_regf_input_file(regf, argv[optind])) {
    fprintf(stderr, "Could not set name of registry file: %s, %s\n", 
	    argv[1], strerror(errno));
    exit(3);
  }

  /* Now, open it, and bring it into memory :-) */

  if (nt_load_registry(regf) < 0) {
    fprintf(stderr, "Could not load registry: %s\n", argv[1]);
    exit(4);
  }

  /*
   * At this point, we should have a registry in memory and should be able
   * to iterate over it.
   */

  nt_key_iterator(regf, regf->root, 0, "", print_key, print_val);
  return 0;
}