summaryrefslogtreecommitdiff
path: root/source3/utils/editreg.c
blob: 43cd14d57d4af75fb98fd8d2576ed8c51d118bed (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
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073
2074
2075
2076
2077
2078
2079
2080
2081
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096
2097
2098
2099
2100
2101
2102
2103
2104
2105
2106
2107
2108
2109
2110
2111
2112
2113
2114
2115
2116
2117
2118
2119
2120
2121
2122
2123
2124
2125
2126
2127
2128
2129
2130
2131
2132
2133
2134
2135
2136
2137
2138
2139
2140
2141
2142
2143
2144
2145
2146
2147
2148
2149
2150
2151
2152
2153
2154
2155
2156
2157
2158
2159
2160
2161
2162
2163
2164
2165
2166
2167
2168
2169
2170
2171
2172
2173
2174
2175
2176
2177
2178
2179
2180
2181
2182
2183
2184
2185
2186
2187
2188
2189
2190
2191
2192
2193
2194
2195
2196
2197
2198
2199
2200
2201
2202
2203
2204
2205
2206
2207
2208
2209
2210
2211
2212
2213
2214
2215
2216
2217
2218
2219
2220
2221
2222
2223
2224
2225
2226
2227
2228
2229
2230
2231
2232
2233
2234
2235
2236
2237
2238
2239
2240
2241
2242
2243
2244
2245
2246
2247
2248
2249
2250
2251
2252
2253
2254
2255
2256
2257
2258
2259
2260
2261
2262
2263
2264
2265
2266
2267
2268
2269
2270
2271
2272
2273
2274
2275
2276
2277
2278
2279
2280
2281
2282
2283
2284
2285
2286
2287
2288
2289
2290
2291
2292
2293
2294
2295
2296
2297
2298
2299
2300
2301
2302
2303
2304
2305
2306
2307
2308
2309
2310
2311
2312
2313
2314
2315
2316
2317
2318
2319
2320
2321
2322
2323
2324
2325
2326
2327
2328
2329
2330
2331
2332
2333
2334
2335
2336
2337
2338
2339
2340
2341
2342
2343
2344
2345
2346
2347
2348
2349
2350
2351
2352
2353
2354
2355
2356
2357
2358
2359
2360
2361
2362
2363
2364
2365
2366
2367
2368
2369
2370
2371
2372
2373
2374
2375
2376
2377
2378
2379
2380
2381
2382
2383
2384
2385
2386
2387
2388
2389
2390
2391
2392
2393
2394
2395
2396
2397
2398
2399
2400
2401
2402
2403
2404
2405
2406
2407
2408
2409
2410
2411
2412
2413
2414
2415
2416
2417
2418
2419
2420
2421
2422
2423
2424
2425
2426
2427
2428
2429
2430
2431
2432
2433
2434
2435
2436
2437
2438
2439
2440
2441
2442
2443
2444
2445
2446
2447
2448
2449
2450
2451
2452
2453
2454
2455
2456
2457
2458
2459
2460
2461
2462
2463
2464
2465
2466
2467
2468
2469
2470
2471
2472
2473
2474
2475
2476
2477
2478
2479
2480
2481
2482
2483
2484
2485
2486
2487
2488
2489
2490
2491
2492
2493
2494
2495
2496
2497
2498
2499
2500
2501
2502
2503
2504
2505
2506
2507
2508
2509
2510
2511
2512
2513
2514
2515
2516
2517
2518
2519
2520
2521
2522
2523
2524
2525
2526
2527
2528
2529
2530
2531
2532
2533
2534
2535
2536
2537
2538
2539
2540
2541
2542
2543
2544
2545
2546
2547
2548
2549
2550
2551
2552
2553
2554
2555
2556
2557
2558
2559
2560
2561
2562
2563
2564
2565
2566
2567
2568
2569
2570
2571
2572
2573
2574
2575
2576
2577
2578
2579
2580
2581
2582
2583
2584
2585
2586
2587
2588
2589
2590
2591
2592
2593
2594
2595
2596
2597
2598
2599
2600
2601
2602
2603
2604
2605
2606
2607
2608
2609
2610
2611
2612
2613
2614
2615
2616
2617
2618
2619
2620
2621
2622
2623
2624
2625
2626
2627
2628
2629
2630
2631
2632
2633
2634
2635
2636
2637
2638
2639
2640
2641
2642
2643
2644
2645
2646
2647
2648
2649
2650
2651
2652
2653
2654
2655
2656
2657
2658
2659
2660
2661
2662
2663
2664
2665
2666
2667
2668
2669
2670
2671
2672
2673
2674
2675
2676
2677
2678
2679
2680
2681
2682
2683
2684
2685
2686
2687
2688
2689
2690
2691
2692
2693
2694
2695
2696
2697
2698
2699
2700
2701
2702
2703
2704
2705
2706
2707
2708
2709
2710
2711
2712
2713
2714
2715
2716
2717
2718
2719
2720
2721
2722
2723
2724
2725
2726
2727
2728
2729
2730
2731
2732
2733
2734
2735
2736
2737
2738
2739
2740
2741
2742
2743
2744
2745
2746
2747
2748
2749
2750
2751
2752
2753
2754
2755
2756
2757
2758
2759
2760
2761
2762
2763
2764
2765
2766
2767
2768
2769
2770
2771
2772
2773
2774
2775
2776
2777
2778
2779
2780
2781
2782
2783
2784
2785
2786
2787
2788
2789
2790
2791
2792
2793
2794
2795
2796
2797
2798
2799
2800
2801
2802
2803
2804
2805
2806
2807
2808
2809
2810
2811
2812
2813
2814
2815
2816
2817
2818
2819
2820
2821
2822
2823
2824
2825
2826
2827
2828
2829
2830
2831
2832
2833
2834
2835
2836
2837
2838
2839
2840
2841
2842
2843
2844
2845
2846
2847
2848
2849
2850
2851
2852
2853
2854
2855
2856
2857
2858
2859
2860
2861
2862
2863
2864
2865
2866
2867
2868
2869
2870
2871
2872
2873
2874
2875
2876
2877
2878
2879
2880
2881
2882
2883
2884
2885
2886
2887
2888
2889
2890
2891
2892
2893
2894
2895
2896
2897
2898
2899
2900
2901
2902
2903
2904
2905
2906
2907
2908
2909
2910
2911
2912
2913
2914
2915
2916
2917
2918
2919
2920
2921
2922
2923
2924
2925
2926
2927
2928
2929
2930
2931
2932
2933
2934
2935
2936
2937
2938
2939
2940
2941
2942
2943
2944
2945
2946
2947
2948
2949
2950
2951
2952
2953
2954
2955
2956
2957
2958
2959
2960
2961
2962
2963
2964
2965
2966
2967
2968
2969
2970
2971
2972
2973
2974
2975
2976
2977
2978
2979
2980
2981
2982
2983
2984
2985
2986
2987
2988
2989
2990
2991
2992
2993
2994
2995
2996
2997
2998
2999
3000
3001
3002
3003
3004
3005
3006
3007
3008
3009
3010
3011
3012
3013
3014
3015
/*
   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>

#define False 0
#define True 1
#define REG_KEY_LIST_SIZE 10

static int verbose = 0;
static int print_security = 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;
  int max_keys;
  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;

#define SEC_DESC_NON 0
#define SEC_DESC_RES 1
#define SEC_DESC_OCU 2

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

/* 
 * 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 ace_struct {
    unsigned char type;
    unsigned char flags;
    unsigned short length;
    unsigned int perms;
    DOM_SID trustee;
} REG_ACE;

typedef struct acl_struct {
  WORD rev;
  WORD size;
  DWORD num_aces;
  REG_ACE *aces;   /* One or more ACEs */
} REG_ACL;

typedef struct sec_desc_rec {
  WORD rev;
  WORD type;
  DWORD owner_off;
  DWORD group_off;
  DWORD sacl_off;
  DWORD dacl_off;
} REG_SEC_DESC;

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_NONE      0
#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;
  const char * str;
} VAL_STR;

/* 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;

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;
};

typedef struct regf_struct_s REGF;

/*
 * 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
 */

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

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

typedef int (*sec_print_f)(SEC_DESC *sec_desc);

int nt_key_iterator(REGF *regf, REG_KEY *key_tree, int bf, const char *path, 
		    key_print_f key_print, sec_print_f sec_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, 
			 const char *path,
			 key_print_f key_print, sec_print_f sec_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, 
			 sec_print, val_print)) {
      return 0;
    }
  }
  return 1;
}

int nt_key_iterator(REGF *regf, REG_KEY *key_tree, int bf, const char *path,
		    key_print_f key_print, sec_print_f sec_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;
  }

  /*
   * If we have a security print routine, call it
   * If the security print routine returns false, stop.
   */
  if (sec_print) {
    if (key_tree->security && !(*sec_print)(key_tree->security->sec_desc))
      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, key_tree->name);
  strcat(new_path, "\\");

  /*
   * 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, 
			    sec_print, val_print)) {
    free(new_path);
    return 0;
  } 

  free(new_path);
  return 1;
}

REG_KEY *nt_find_key_by_name(REG_KEY *tree, char *key);

/*
 * Find key by name in a list ...
 * Take the first component and search for that in the list
 */
REG_KEY *nt_find_key_in_list_by_name(KEY_LIST *list, char *key)
{
  int i;
  REG_KEY *res = NULL;

  if (!list || !key || !*key) return NULL;

  for (i = 0; i<= list->key_count; i++)
    if ((res = nt_find_key_by_name(list->keys[i], key)))
      return res;
  
  return NULL;
}

/* 
 * Find key by name in a tree ... We will assume absolute names here, but we
 * need the root of the tree ...
 */
REG_KEY *nt_find_key_by_name(REG_KEY *tree, char *key)
{
  char *lname = NULL, *c1, *c2;
  REG_KEY *tmp;

  if (!tree || !key || !*key) return NULL;

  lname = strdup(key);
  if (!lname) return NULL;

  /*
   * Make sure that the first component is correct ...
   */
  c1 = lname;
  c2 = strchr(c1, '\\');
  if (c2) { /* Split here ... */
    *c2 = 0;
    c2++;
  }
  if (strcmp(c1, tree->name) != 0) goto error; 

  if (c2) {
    tmp = nt_find_key_in_list_by_name(tree->sub_keys, c2);
    free(lname);
    return tmp;
  }
  else {
    if (lname) free(lname);
    return tree;
  }
 error:
  if (lname) free(lname);
  return NULL;
}

/* Make, delete keys */

int nt_delete_val_key(VAL_KEY *val_key)
{

  if (val_key) {
    if (val_key->data_blk) free(val_key->data_blk);
    free(val_key);
  };
  return 1;
}

int nt_delete_val_list(VAL_LIST *vl)
{
  int i;

  if (vl) {
    for (i=0; i<vl->val_count; i++)
      nt_delete_val_key(vl->vals[i]);
    free(vl);
  }
  return 1;
}

int nt_delete_reg_key(REG_KEY *key, int delete_name);
int nt_delete_key_list(KEY_LIST *key_list, int delete_name)
{
  int i;

  if (key_list) {
    for (i=0; i<key_list->key_count; i++) 
      nt_delete_reg_key(key_list->keys[i], False);
    free(key_list);
  }
  return 1;
}

/*
 * Find the key, and if it exists, delete it ...
 */
int nt_delete_key_by_name(REGF *regf, char *name)
{
  REG_KEY *key;

  if (!name || !*name) return 0;

  key = nt_find_key_by_name(regf->root, name);

  if (key) {
    return nt_delete_reg_key(key, True);
  }

  return 0;

}

int nt_delete_sid(DOM_SID *sid)
{

  if (sid) free(sid);
  return 1;

}

int nt_delete_ace(ACE *ace)
{

  if (ace) {
    nt_delete_sid(ace->trustee);
    free(ace);
  }
  return 1;

}

int nt_delete_acl(ACL *acl)
{

  if (acl) {
    int i;

    for (i=0; i<acl->num_aces; i++)
      nt_delete_ace(acl->aces[i]);

    free(acl);
  }
  return 1;
}

int nt_delete_sec_desc(SEC_DESC *sec_desc)
{

  if (sec_desc) {

    nt_delete_sid(sec_desc->owner);
    nt_delete_sid(sec_desc->group);
    nt_delete_acl(sec_desc->sacl);
    nt_delete_acl(sec_desc->dacl);
    free(sec_desc);

  }
  return 1;
}

int nt_delete_key_sec_desc(KEY_SEC_DESC *key_sec_desc)
{

  if (key_sec_desc) {
    key_sec_desc->ref_cnt--;
    if (key_sec_desc->ref_cnt<=0) {
      /*
       * There should always be a next and prev, even if they point to us 
       */
      key_sec_desc->next->prev = key_sec_desc->prev;
      key_sec_desc->prev->next = key_sec_desc->next;
      nt_delete_sec_desc(key_sec_desc->sec_desc);
    }
  }
  return 1;
}

int nt_delete_reg_key(REG_KEY *key, int delete_name)
{

  if (key) {
    if (key->name) free(key->name);
    if (key->class_name) free(key->class_name);

    /*
     * We will delete the owner if we are not the root and told to ...
     */

    if (key->owner && key->owner->sub_keys && delete_name) {
      REG_KEY *own;
      KEY_LIST *kl;
      int i;
      /* Find our owner, look in keylist for us and shuffle up */
      /* Perhaps should be a function                          */

      own = key->owner;
      kl = own->sub_keys;

      for (i=0; i < kl->key_count && kl->keys[i] != key ; i++) {
	/* Just find the entry ... */
      }

      if (i == kl->key_count) {
	fprintf(stderr, "Bad data structure. Key not found in key list of owner\n");
      }
      else {
	int j;

	/*
	 * Shuffle up. Works for the last one also 
	 */
	for (j = i + 1; j < kl->key_count; j++) {
	  kl->keys[j - 1] = kl->keys[j];
	}

	kl->key_count--;
      }
    }

    if (key->sub_keys) nt_delete_key_list(key->sub_keys, False);
    if (key->values) nt_delete_val_list(key->values);
    if (key->security) nt_delete_key_sec_desc(key->security);
    free(key);
  }
  return 1;
}

/*
 * Add a value to the key specified ...
 */
REG_KEY *nt_add_reg_value(REG_KEY *key, char *name, int type, char *value)
{

  return NULL;
}

/*
 * Delete a value. Should perhaps return the value ...
 */
REG_KEY *nt_delete_reg_valye(REG_KEY *key, char *name)
{

  return NULL;
}

/* 
 * Add a key to the tree ... We walk down the components matching until
 * we don't find any. There must be a match on the first component ...
 * We return the key structure for the final component as that is 
 * often where we want to add values ...
 */

/*
 * Create a 1 component key name and set its parent to parent
 */
REG_KEY *nt_create_reg_key1(char *name, REG_KEY *parent)
{
  REG_KEY *tmp;

  if (!name || !*name) return NULL; /* A key's name cannot be empty */

  /* There should not be more than one component */
  if (strchr(name, '\\')) return NULL;

  if (!(tmp = (REG_KEY *)malloc(sizeof(REG_KEY)))) return NULL;

  bzero(tmp, sizeof(REG_KEY));

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



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

REG_KEY *nt_add_reg_key(REG_KEY *key, char *name, int create);
REG_KEY *nt_add_reg_key_list(REG_KEY *key, char * name, int create)
{
  int i;
  REG_KEY *ret;
  KEY_LIST *list;
  char *lname, *c1, *c2;

  if (!key || !name || !*name) return NULL;
  
  list = key->sub_keys;
  if (!list) { /* Create an empty list */

    list = (KEY_LIST *)malloc(sizeof(KEY_LIST) + (REG_KEY_LIST_SIZE - 1) * sizeof(REG_KEY *));
    list->key_count = list->max_keys = 0;

  }

  for (i = 0; i < list->key_count; i++) {
    if ((ret = nt_add_reg_key(list->keys[i], name, create)))
      return ret;
  }

  /*
   * If we reach here we could not find the the first component
   * so create it ...
   */

  lname = strdup(name);
  if (!lname) return NULL;

  c1 = lname;
  c2 = strchr(c1, '\\');
  if (c2) { /* Split here ... */
    *c2 = 0;
    c2++;
  }

  if (list->key_count < list->max_keys){
    list->key_count++;
  }
  else { /* Create more space in the list ... */
    if (!(list = (KEY_LIST *)realloc(list, sizeof(KEY_LIST) + 
				     (list->max_keys + REG_KEY_LIST_SIZE - 1) 
				     * sizeof(REG_KEY *))));
      goto error;

    list->max_keys += REG_KEY_LIST_SIZE;
    list->key_count++;
  }

  return NULL;
 error:
  if (lname) free(lname);
  return NULL;
}

REG_KEY *nt_add_reg_key(REG_KEY *key, char *name, int create)
{
  char *lname = NULL, *c1, *c2;
  REG_KEY * tmp;

  /*
   * Look until we hit the first component that does not exist, and
   * then add from there. However, if the first component does not 
   * match and the path we are given is the root, then it must match
   */
  if (!key || !name || !*name) return NULL;

  lname = strdup(name);
  if (!lname) return NULL;

  c1 = lname;
  c2 = strchr(c1, '\\');
  if (c2) { /* Split here ... */
    *c2 = 0;
    c2++;
  }

  /*
   * If we don't match, then we have to return error ...
   * If we do match on this component, check the next one in the
   * list, and if not found, add it ... short circuit, add all the
   * way down
   */

  if (strcmp(c1, key->name) != 0)
    goto error;
  
  tmp = nt_add_reg_key_list(key, c2, True);
  free(lname);
  return tmp;
  
 error:
  if (lname) free(lname);
  return NULL;
}

/*
 * 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 
 */

/* 
 * 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 

/*
 * 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 CVAL(buf) ((unsigned char)*((unsigned char *)(buf)))

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

const VAL_STR reg_type_names[] = {
   { REG_TYPE_REGSZ,    "REG_SZ" },
   { REG_TYPE_EXPANDSZ, "REG_EXPAND_SZ" },
   { REG_TYPE_BIN,      "REG_BIN" },
   { REG_TYPE_DWORD,    "REG_DWORD" },
   { REG_TYPE_MULTISZ,  "REG_MULTI_SZ" },
   { 0, NULL },
};

const char *val_to_str(unsigned int val, const 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;

}

/*
 * 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;
}

/*
 * Convert a data value to a string for display
 */
int data_to_ascii(unsigned char *datap, int len, int type, char *ascii, int ascii_max)
{ 
  unsigned char *asciip;
  int i;

  switch (type) {
  case REG_TYPE_REGSZ:
    if (verbose) fprintf(stderr, "Len: %d\n", len);
    return uni_to_ascii(datap, ascii, len, ascii_max);
    break;

  case REG_TYPE_EXPANDSZ:
    return uni_to_ascii(datap, ascii, len, ascii_max);
    break;

  case REG_TYPE_BIN:
    asciip = ascii;
    for (i=0; (i<len)&&(i+1)*3<ascii_max; i++) { 
      int str_rem = ascii_max - ((int)asciip - (int)ascii);
      asciip += snprintf(asciip, str_rem, "%02x", *(unsigned char *)(datap+i));
      if (i < len && str_rem > 0)
	*asciip = ' '; asciip++;	
    }
    *asciip = '\0';
    return ((int)asciip - (int)ascii);
    break;

  case REG_TYPE_DWORD:
    if (*(int *)datap == 0)
      return snprintf(ascii, ascii_max, "0");
    else
      return snprintf(ascii, ascii_max, "0x%x", *(int *)datap);
    break;

  case REG_TYPE_MULTISZ:

    break;

  default:
    return 0;
    break;
  } 

  return len;

}

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

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);

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

  free(regf);

  return 1;
}

/* 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 an SK header ...
 * Every time we see a new one, add it to the map. Otherwise, just look it up.
 * We will do a simple linear search for the moment, since many KEYs have the 
 * same security descriptor. 
 * We allocate the map in increments of 10 entries.
 */

/*
 * Create a new entry in the map, and increase the size of the map if needed
 */

SK_MAP *alloc_sk_map_entry(REGF *regf, KEY_SEC_DESC *tmp, int sk_off)
{
 if (!regf->sk_map) { /* Allocate a block of 10 */
    regf->sk_map = (SK_MAP *)malloc(sizeof(SK_MAP) * 10);
    if (!regf->sk_map) {
      free(tmp);
      return NULL;
    }
    regf->sk_map_size = 10;
    regf->sk_count = 1;
    (regf->sk_map)[0].sk_off = sk_off;
    (regf->sk_map)[0].key_sec_desc = tmp;
  }
  else { /* Simply allocate a new slot, unless we have to expand the list */ 
    int ndx = regf->sk_count;
    if (regf->sk_count >= regf->sk_map_size) {
      regf->sk_map = (SK_MAP *)realloc(regf->sk_map, 
				       (regf->sk_map_size + 10)*sizeof(SK_MAP));
      if (!regf->sk_map) {
	free(tmp);
	return NULL;
      }
      /*
       * ndx already points at the first entry of the new block
       */
      regf->sk_map_size += 10;
    }
    (regf->sk_map)[ndx].sk_off = sk_off;
    (regf->sk_map)[ndx].key_sec_desc = tmp;
    regf->sk_count++;
  }
 return regf->sk_map;
}

/*
 * Search for a KEY_SEC_DESC in the sk_map, but don't create one if not
 * found
 */

KEY_SEC_DESC *lookup_sec_key(SK_MAP *sk_map, int count, int sk_off)
{
  int i;

  if (!sk_map) return NULL;

  for (i = 0; i < count; i++) {

    if (sk_map[i].sk_off == sk_off)
      return sk_map[i].key_sec_desc;

  }

  return NULL;

}

/*
 * Allocate a KEY_SEC_DESC if we can't find one in the map
 */

KEY_SEC_DESC *lookup_create_sec_key(REGF *regf, SK_MAP *sk_map, int sk_off)
{
  KEY_SEC_DESC *tmp = lookup_sec_key(regf->sk_map, regf->sk_count, sk_off);

  if (tmp) {
    return tmp;
  }
  else { /* Allocate a new one */
    tmp = (KEY_SEC_DESC *)malloc(sizeof(KEY_SEC_DESC));
    if (!tmp) {
      return NULL;
    }
    tmp->state = SEC_DESC_RES;
    if (!alloc_sk_map_entry(regf, tmp, sk_off)) {
      return NULL;
    }
    return tmp;
  }
}

/*
 * Allocate storage and duplicate a SID 
 * We could allocate the SID to be only the size needed, but I am too lazy. 
 */
DOM_SID *dup_sid(DOM_SID *sid)
{
  DOM_SID *tmp = (DOM_SID *)malloc(sizeof(DOM_SID));
  int i;
  
  if (!tmp) return NULL;
  tmp->ver = sid->ver;
  tmp->auths = sid->auths;
  for (i=0; i<6; i++) {
    tmp->auth[i] = sid->auth[i];
  }
  for (i=0; i<tmp->auths&&i<MAXSUBAUTHS; i++) {
    tmp->sub_auths[i] = sid->sub_auths[i];
  }
  return tmp;
}

/*
 * Allocate space for an ACE and duplicate the registry encoded one passed in
 */
ACE *dup_ace(REG_ACE *ace)
{
  ACE *tmp = NULL; 

  tmp = (ACE *)malloc(sizeof(ACE));

  if (!tmp) return NULL;

  tmp->type = CVAL(&ace->type);
  tmp->flags = CVAL(&ace->flags);
  tmp->perms = IVAL(&ace->perms);
  tmp->trustee = dup_sid(&ace->trustee);
  return tmp;
}

/*
 * Allocate space for an ACL and duplicate the registry encoded one passed in 
 */
ACL *dup_acl(REG_ACL *acl)
{
  ACL *tmp = NULL;
  REG_ACE* ace;
  int i, num_aces;

  num_aces = IVAL(&acl->num_aces);

  tmp = (ACL *)malloc(sizeof(ACL) + (num_aces - 1)*sizeof(ACE *));
  if (!tmp) return NULL;

  tmp->num_aces = num_aces;
  tmp->refcnt = 1;
  tmp->rev = SVAL(&acl->rev);
  ace = (REG_ACE *)&acl->aces;
  for (i=0; i<num_aces; i++) {
    tmp->aces[i] = dup_ace(ace);
    ace = (REG_ACE *)((char *)ace + SVAL(&ace->length));
    /* XXX: FIXME, should handle malloc errors */
  }

  return tmp;
}

SEC_DESC *process_sec_desc(REGF *regf, REG_SEC_DESC *sec_desc)
{
  SEC_DESC *tmp = NULL;
  
  tmp = (SEC_DESC *)malloc(sizeof(SEC_DESC));

  if (!tmp) {
    return NULL;
  }
  
  tmp->rev = SVAL(&sec_desc->rev);
  tmp->type = SVAL(&sec_desc->type);
  tmp->owner = dup_sid((DOM_SID *)((char *)sec_desc + IVAL(&sec_desc->owner_off)));
  if (!tmp->owner) {
    free(tmp);
    return NULL;
  }
  tmp->group = dup_sid((DOM_SID *)((char *)sec_desc + IVAL(&sec_desc->group_off)));
  if (!tmp->group) {
    free(tmp);
    return NULL;
  }

  /* Now pick up the SACL and DACL */

  if (sec_desc->sacl_off)
    tmp->sacl = dup_acl((REG_ACL *)((char *)sec_desc + IVAL(&sec_desc->sacl_off)));
  else
    tmp->sacl = NULL;

  if (sec_desc->dacl_off)
    tmp->dacl = dup_acl((REG_ACL *)((char *)sec_desc + IVAL(&sec_desc->dacl_off)));
  else
    tmp->dacl = NULL;

  return tmp;
}

KEY_SEC_DESC *process_sk(REGF *regf, SK_HDR *sk_hdr, int sk_off, int size)
{
  KEY_SEC_DESC *tmp = NULL;
  int sk_next_off, sk_prev_off, sk_size;
  REG_SEC_DESC *sec_desc;

  if (!sk_hdr) return NULL;

  if (SVAL(&sk_hdr->SK_ID) != REG_SK_ID) {
    fprintf(stderr, "Unrecognized SK Header ID: %08X, %s\n", (int)sk_hdr,
	    regf->regfile_name);
    return NULL;
  }

  if (-size < (sk_size = IVAL(&sk_hdr->rec_size))) {
    fprintf(stderr, "Incorrect SK record size: %d vs %d. %s\n",
	    -size, sk_size, regf->regfile_name);
    return NULL;
  }

  /* 
   * Now, we need to look up the SK Record in the map, and return it
   * Since the map contains the SK_OFF mapped to KEY_SEC_DESC, we can
   * use that
   */

  if (regf->sk_map &&
      ((tmp = lookup_sec_key(regf->sk_map, regf->sk_count, sk_off)) != NULL)
      && (tmp->state == SEC_DESC_OCU)) {
    tmp->ref_cnt++;
    return tmp;
  }

  /* Here, we have an item in the map that has been reserved, or tmp==NULL. */

  assert(tmp == NULL || (tmp && tmp->state != SEC_DESC_NON));

  /*
   * Now, allocate a KEY_SEC_DESC, and parse the structure here, and add the
   * new KEY_SEC_DESC to the mapping structure, since the offset supplied is 
   * the actual offset of structure. The same offset will be used by
   * all future references to this structure
   * We could put all this unpleasantness in a function.
   */

  if (!tmp) {
    tmp = (KEY_SEC_DESC *)malloc(sizeof(KEY_SEC_DESC));
    if (!tmp) return NULL;
    bzero(tmp, sizeof(KEY_SEC_DESC));
    
    /*
     * Allocate an entry in the SK_MAP ...
     * We don't need to free tmp, because that is done for us if the
     * sm_map entry can't be expanded when we need more space in the map.
     */
    
    if (!alloc_sk_map_entry(regf, tmp, sk_off)) {
      return NULL;
    }
  }

  tmp->ref_cnt++;
  tmp->state = SEC_DESC_OCU;

  /*
   * Now, process the actual sec desc and plug the values in
   */

  sec_desc = (REG_SEC_DESC *)&sk_hdr->sec_desc[0];
  tmp->sec_desc = process_sec_desc(regf, sec_desc);

  /*
   * Now forward and back links. Here we allocate an entry in the sk_map
   * if it does not exist, and mark it reserved
   */

  sk_prev_off = IVAL(&sk_hdr->prev_off);
  tmp->prev = lookup_create_sec_key(regf, regf->sk_map, sk_prev_off);
  assert(tmp->prev != NULL);
  sk_next_off = IVAL(&sk_hdr->next_off);
  tmp->next = lookup_create_sec_key(regf, regf->sk_map, sk_next_off);
  assert(tmp->next != NULL);

  return tmp;
}

/*
 * 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;
  const 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);
    }

    tmp->data_len = 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 (!vl) return 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, REG_KEY *parent)
{
  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;
  tmp->max_keys = 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), parent);
    if (!tmp->keys[i]) {
      goto error;
    }
  }

  return tmp;

 error:
  if (tmp) nt_delete_key_list(tmp, False);
  return NULL;
}

/*
 * This routine is passed an NK_HDR pointer and retrieves the entire tree
 * from there down. It returns a REG_KEY *.
 */
REG_KEY *nt_get_key_tree(REGF *regf, NK_HDR *nk_hdr, int size, REG_KEY *parent)
{
  REG_KEY *tmp = NULL, *own;
  int name_len, clsname_len, lf_off, val_off, val_count, sk_off, own_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.
     * It will also piss off people who need Unicode/UTF-8 strings. Sorry. 
     * XXX: FIXME
     */

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

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

  }

  /*
   * Process the owner offset ...
   */

  own_off = IVAL(&nk_hdr->own_off);
  own = (REG_KEY *)LOCN(regf->base, own_off);

  if (verbose) fprintf(stdout, "  Owner offset: %0X, Our Offset: %0X\n", 
		       (unsigned int)own, (unsigned int)nk_hdr);

  /* 
   * We should verify that the owner field is correct ...
   * for now, we don't worry ...
   */

  tmp->owner = parent;

  /*
   * 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) {

    tmp->security = process_sk(regf, sk_hdr, sk_off, BLK_SIZE(sk_hdr));

  } 

  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), tmp);
    if (!tmp->sub_keys){
      goto error;
    }

  }

  return tmp;

 error:
  if (tmp) nt_delete_reg_key(tmp, False);
  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), NULL);

  assert(regf->root != NULL);

  /*
   * Unmap the registry file, as we might want to read in another
   * tree etc.
   */

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

  return 1;
}

/*
 * Story the registry in the output file
 */
int nt_store_registry(REGF *regf)
{

  return 1;
}

/*
 * Routines to parse a REGEDIT4 file
 * 
 * The file consists of:
 * 
 * REGEDIT4
 * \[[-]key-path\]\n
 * <value-spec>*
 *
 * Format:
 * [cmd:]name=type:value
 *
 * cmd = a|d|c|add|delete|change|as|ds|cs
 *
 * There can be more than one key-path and value-spec.
 *
 * Since we want to support more than one type of file format, we
 * construct a command-file structure that keeps info about the command file
 */

#define FMT_UNREC -1
#define FMT_REGEDIT4 0
#define FMT_EDITREG1_1 1

#define FMT_STRING_REGEDIT4 "REGEDIT4"
#define FMT_STRING_EDITREG1_0 "EDITREG1.0"

#define CMD_NONE     0
#define CMD_ADD_KEY  1
#define CMD_DEL_KEY  2

#define CMD_KEY 1
#define CMD_VAL 2

typedef struct val_spec_list {
  struct val_spec_list *next;
  char *name;
  int type;
  char *val;    /* Kept as a char string, really? */
} VAL_SPEC_LIST;

typedef struct command_s {
  int cmd;
  char *key;
  int val_count;
  VAL_SPEC_LIST *val_spec_list, *val_spec_last;
} CMD;

typedef struct cmd_line {
  int len, line_len;
  char *line;
} CMD_LINE;

/* 
 * Some routines to handle lines of info in the command files
 */
void skip_to_eol(int fd)
{
  int rc;
  char ch = 0;

  while ((rc = read(fd, &ch, 1)) == 1) {
    if (ch == 0x0A) return;
  }
  if (rc < 0) {
    fprintf(stderr, "Could not read file descriptor: %d, %s\n",
	    fd, strerror(errno));
    exit(1);
  }
}

void free_cmd(CMD *cmd)
{
  if (!cmd) return;

  while (cmd->val_spec_list) {
    VAL_SPEC_LIST *tmp;

    tmp = cmd->val_spec_list;
    cmd->val_spec_list = tmp->next;
    free(tmp);
  }

  free(cmd);

}

void free_cmd_line(CMD_LINE *cmd_line)
{
  if (cmd_line) {
    if (cmd_line->line) free(cmd_line->line);
    free(cmd_line);
  }
}

void print_line(struct cmd_line *cl)
{
  char *pl;

  if (!cl) return;

  if ((pl = malloc(cl->line_len + 1)) == NULL) {
    fprintf(stderr, "Unable to allocate space to print line: %s\n",
	    strerror(errno));
    exit(1);
  }

  strncpy(pl, cl->line, cl->line_len);
  pl[cl->line_len] = 0;

  fprintf(stdout, "%s\n", pl);
  free(pl);
}

#define INIT_ALLOC 10 

/*
 * Read a line from the input file.
 * NULL returned when EOF and no chars read
 * Otherwise we return a cmd_line *
 * Exit if other errors
 */
struct cmd_line *get_cmd_line(int fd)
{
  struct cmd_line *cl = (CMD_LINE *)malloc(sizeof(CMD_LINE));
  int i = 0, rc;
  unsigned char ch;

  if (!cl) {
    fprintf(stderr, "Unable to allocate structure for command line: %s\n",
	    strerror(errno));
    exit(1);
  }

  cl->len = INIT_ALLOC;

  /*
   * Allocate some space for the line. We extend later if needed.
   */

  if ((cl->line = (char *)malloc(INIT_ALLOC)) == NULL) {
    fprintf(stderr, "Unable to allocate initial space for line: %s\n",
	    strerror(errno));
    exit(1);
  }

  /*
   * Now read in the chars to EOL. Don't store the EOL in the 
   * line. What about CR?
   */

  while ((rc = read(fd, &ch, 1)) == 1 && ch != '\n') {
    if (ch == '\r') continue; /* skip CR */
    if (i == cl->len) {
      /*
       * Allocate some more memory
       */
      if ((cl->line = realloc(cl->line, cl->len + INIT_ALLOC)) == NULL) {
	fprintf(stderr, "Unable to realloc space for line: %s\n",
		strerror(errno));
	exit(1);
      }
      cl->len += INIT_ALLOC;
    }
    cl->line[i] = ch;
    i++;
  }

  /* read 0 and we were at loc'n 0, return NULL */
  if (rc == 0 && i == 0) {
    free_cmd_line(cl);
    return NULL;
  }

  cl->line_len = i;

  return cl;

}

/*
 * parse_value: parse out a value. We pull it apart as:
 *
 * <value> ::= <value-name>=<type>:<value-string>
 *
 * <value-name> ::= char-string-without-spaces | '"' char-string '"'
 *
 * If it parsed OK, return the <value-name> as a string, and the
 * value type and value-string in parameters.
 *
 * The value name can be empty. There can only be one empty name in 
 * a list of values. A value of - removes the value entirely.  
 */

char *dup_str(char *s, int len) 
{ 
  char *nstr; 
  nstr = (char *)malloc(len + 1);
  if (nstr) {
    memcpy(nstr, s, len);
    nstr[len] = 0;
  }
  return nstr;
}

char *parse_name(char *nstr)
{
  int len = 0, start = 0;
  if (!nstr) return NULL;

  len = strlen(nstr);

  while (len && nstr[len - 1] == ' ') len--;

  nstr[len] = 0; /* Trim any spaces ... if there were none, doesn't matter */

  /*
   * Beginning and end should be '"' or neither should be so
   */
  if ((nstr[0] == '"' && nstr[len - 1] != '"') ||
      (nstr[0] != '"' && nstr[len - 1] == '"'))
    return NULL;

  if (nstr[0] == '"') {
    start = 1;
    len -= 2;
  }

  return dup_str(&nstr[start], len);
}

int parse_value_type(char *tstr)
{
  int len = strlen(tstr);
  
  while (len && tstr[len - 1] == ' ') len--;
  tstr[len] = 0;

  if (strcmp(tstr, "REG_DWORD") == 0)
    return REG_TYPE_DWORD;
  else if (strcmp(tstr, "dword") == 0)
    return REG_TYPE_DWORD;
  else if (strcmp(tstr, "REG_EXPAND_SZ") == 0)
    return REG_TYPE_EXPANDSZ;
  else if (strcmp(tstr, "REG_BIN") == 0)
    return REG_TYPE_BIN;
  else if (strcmp(tstr, "REG_SZ") == 0)
    return REG_TYPE_REGSZ;
  else if (strcmp(tstr, "REG_MULTI_SZ") == 0)
    return REG_TYPE_MULTISZ;

  return 0;
}

char *parse_val_str(char *vstr)
{
  
  return dup_str(vstr, strlen(vstr));

}

char *parse_value(struct cmd_line *cl, int *vtype, char **val)
{
  char *p1 = NULL, *p2 = NULL, *nstr = NULL, *tstr = NULL, *vstr = NULL;
  
  if (!cl || !vtype || !val) return NULL;
  if (!cl->line_len) return NULL;

  p1 = dup_str(cl->line, cl->line_len);
  /* FIXME: Better return codes etc ... */
  if (!p1) return NULL;
  p2 = strchr(p1, '=');
  if (!p2) return NULL;

  *p2 = 0; p2++; /* Split into two strings at p2 */

  /* Now, parse the name ... */

  nstr = parse_name(p1);
  if (!nstr) goto error;

  /* Now, split the remainder and parse on type and val ... */

  tstr = p2;
  while (*tstr == ' ') tstr++; /* Skip leading white space */
  p2 = strchr(p2, ':');

  if (!p2) goto error;

  *p2 = 0; p2++; /* split on the : */

  *vtype = parse_value_type(tstr);

  if (!vtype) goto error;

  /* Now, parse the value string. It should return a newly malloc'd string */
  
  while (*p2 == ' ') p2++; /* Skip leading space */
  vstr = parse_val_str(p2);

  if (!vstr) goto error;

  *val = vstr;

  return nstr;

 error:
  if (p1) free(p1);
  if (nstr) free(nstr);
  if (vstr) free(vstr);
  return NULL;
}

/*
 * Parse out a key. Look for a correctly formatted key [...] 
 * and whether it is a delete or add? A delete is signalled 
 * by a - in front of the key.
 * Assumes that there are no leading and trailing spaces
 */

char *parse_key(struct cmd_line *cl, int *cmd)
{
  int start = 1;
  char *tmp;

  if (cl->line[0] != '[' ||
      cl->line[cl->line_len - 1] != ']') return NULL;
  if (cl->line_len == 2) return NULL;
  *cmd = CMD_ADD_KEY;
  if (cl->line[1] == '-') {
    if (cl->line_len == 3) return NULL;
    start = 2;
    *cmd = CMD_DEL_KEY;
  }
  tmp = malloc(cl->line_len - 1 - start + 1);
  if (!tmp) return tmp; /* Bail out on no mem ... FIXME */
  strncpy(tmp, &cl->line[start], cl->line_len - 1 - start);
  tmp[cl->line_len - 1 - start] = 0;
  return tmp;
}

/*
 * Parse a line to determine if we have a key or a value
 * We only check for key or val ...
 */

int parse_line(struct cmd_line *cl)
{

  if (!cl || cl->len == 0) return 0;

  if (cl->line[0] == '[')  /* No further checking for now */
    return CMD_KEY;
  else 
    return CMD_VAL;
}

/*
 * We seek to offset 0, read in the required number of bytes, 
 * and compare to the correct value.
 * We then seek back to the original location
 */
int regedit4_file_type(int fd)
{
  int cur_ofs = 0;
  char desc[9];

  cur_ofs = lseek(fd, 0, SEEK_CUR); /* Get current offset */
  if (cur_ofs < 0) {
    fprintf(stderr, "Unable to get current offset: %s\n", strerror(errno));
    exit(1);  /* FIXME */
  }

  if (cur_ofs) {
    lseek(fd, 0, SEEK_SET);
  }

  if (read(fd, desc, 8) < 8) {
    fprintf(stderr, "Unable to read command file format\n"); 
    exit(2);  /* FIXME */
  }

  desc[8] = 0;

  if (strcmp(desc, FMT_STRING_REGEDIT4) == 0) {
    if (cur_ofs) {
      lseek(fd, cur_ofs, SEEK_SET);
    }
    else {
      skip_to_eol(fd);
    }
    return FMT_REGEDIT4;
  }

  return FMT_UNREC;
}

/*
 * Run though the data in the line and strip anything after a comment
 * char.
 */
void strip_comment(struct cmd_line *cl)
{
  int i;

  if (!cl) return;

  for (i = 0; i < cl->line_len; i++) {
    if (cl->line[i] == ';') {
      cl->line_len = i;
      return;
    }
  }
}

/* 
 * trim leading space
 */

void trim_leading_spaces(struct cmd_line *cl)
{
  int i;

  if (!cl) return;

  for (i = 0; i < cl->line_len; i++) {
    if (cl->line[i] != ' '){
      if (i) memcpy(cl->line, &cl->line[i], cl->line_len - i);
      return;
    }
  }
}

/* 
 * trim trailing spaces
 */
void trim_trailing_spaces(struct cmd_line *cl)
{
  int i;

  if (!cl) return;

  for (i = cl->line_len; i == 0; i--) {
    if (cl->line[i-1] != ' ' &&
	cl->line[i-1] != '\t') {
      cl->line_len = i;
    }
  }
}

/* 
 * Get a command ... This consists of possibly multiple lines:
 * [key]
 * values*
 * possibly Empty line
 *
 * value ::= <value-name>=<value-type>':'<value-string>
 * <value-name> is some path, possibly enclosed in quotes ...
 * We alctually look for the next key to terminate a previous key
 */
CMD *regedit4_get_cmd(int fd)
{
  struct command_s *cmd = NULL;
  struct cmd_line *cl = NULL;
  struct val_spec_list *vl = NULL;

  if ((cmd = (struct command_s *)malloc(sizeof(struct command_s))) == NULL) {
    fprintf(stderr, "Unable to malloc space for command: %s\n",
	    strerror(errno));
    exit(1);
  }

  cmd->cmd = CMD_NONE;
  cmd->key = NULL;
  cmd->val_spec_list = cmd->val_spec_last = NULL;
  while ((cl = get_cmd_line(fd))) {

    strip_comment(cl);     /* remove anything beyond a comment char */
    trim_trailing_spaces(cl);
    trim_leading_spaces(cl);

    if (cl->line_len == 0) {    /* An empty line */
      free_cmd_line(cl);
    }
    else {                 /* Else, non-empty ... */
      /* 
       * Parse out the bits ... 
       */
      switch (parse_line(cl)) {
      case CMD_KEY:
	if ((cmd->key = parse_key(cl, &cmd->cmd)) == NULL) {
	  fprintf(stderr, "Error parsing key from line: ");
	  print_line(cl);
	  fprintf(stderr, "\n");
	}
	break;

      case CMD_VAL:
	/*
	 * We need to add the value stuff to the list
	 * There could be a \ on the end which we need to 
	 * handle at some time
	 */
	vl = (struct val_spec_list *)malloc(sizeof(struct val_spec_list));
	if (!vl) goto error;
	vl->next = NULL;
	vl->name = parse_value(cl, &vl->type, &vl->val);
	if (!vl->name) goto error;
	if (cmd->val_spec_list == NULL) {
	  cmd->val_spec_list = cmd->val_spec_last = vl;
	}
	else {
	  cmd->val_spec_last->next = vl;
	  cmd->val_spec_last = vl;
	}
	cmd->val_count++;
	break;

      default:
	fprintf(stderr, "Unrecognized line in command file: \n");
	print_line(cl);
	break;
      }
    }

  }
  if (!cmd->cmd) goto error; /* End of file ... */

  return cmd;

 error:
  if (vl) free(vl);
  if (cmd) free_cmd(cmd);
  return NULL;
}

int regedit4_exec_cmd(CMD *cmd)
{

  return 0;
}

int editreg_1_0_file_type(int fd)
{
  int cur_ofs = 0;
  char desc[11];

  cur_ofs = lseek(fd, 0, SEEK_CUR); /* Get current offset */
  if (cur_ofs < 0) {
    fprintf(stderr, "Unable to get current offset: %s\n", strerror(errno));
    exit(1);  /* FIXME */
  }

  if (cur_ofs) {
    lseek(fd, 0, SEEK_SET);
  }

  if (read(fd, desc, 10) < 10) {
    fprintf(stderr, "Unable to read command file format\n"); 
    exit(2);  /* FIXME */
  }

  desc[10] = 0;

  if (strcmp(desc, FMT_STRING_EDITREG1_0) == 0) {
    lseek(fd, cur_ofs, SEEK_SET);
    return FMT_REGEDIT4;
  }

  return FMT_UNREC;
}

CMD *editreg_1_0_get_cmd(int fd)
{
  return NULL;
}

int editreg_1_0_exec_cmd(CMD *cmd)
{

  return -1;
}

typedef struct command_ops_s {
  int type;
  int (*file_type)(int fd);
  CMD *(*get_cmd)(int fd);
  int (*exec_cmd)(CMD *cmd);
} CMD_OPS;

CMD_OPS default_cmd_ops[] = {
  {0, regedit4_file_type, regedit4_get_cmd, regedit4_exec_cmd},
  {1, editreg_1_0_file_type, editreg_1_0_get_cmd, editreg_1_0_exec_cmd},
  {-1,  NULL, NULL, NULL}
}; 

typedef struct command_file_s {
  char *name;
  int type, fd;
  CMD_OPS cmd_ops;
} CMD_FILE;

/*
 * Create a new command file structure
 */

CMD_FILE *cmd_file_create(char *file)
{
  CMD_FILE *tmp;
  struct stat sbuf;
  int i = 0;

  /*
   * Let's check if the file exists ...
   * No use creating the cmd_file structure if the file does not exist
   */

  if (stat(file, &sbuf) < 0) { /* Not able to access file */

    return NULL;
  }

  tmp = (CMD_FILE *)malloc(sizeof(CMD_FILE)); 
  if (!tmp) {
    return NULL;
  }

  /*
   * Let's fill in some of the fields;
   */

  tmp->name = strdup(file);

  if ((tmp->fd = open(file, O_RDONLY, 666)) < 0) {
    free(tmp);
    return NULL;
  }

  /*
   * Now, try to find the format by indexing through the table
   */
  while (default_cmd_ops[i].type != -1) {
    if ((tmp->type = default_cmd_ops[i].file_type(tmp->fd)) >= 0) {
      tmp->cmd_ops = default_cmd_ops[i];
      return tmp;
    }
    i++;
  }

  /* 
   * If we got here, return NULL, as we could not figure out the type
   * of command file.
   *
   * What about errors? 
   */

  free(tmp);
  return NULL;
}

/*
 * Extract commands from the command file, and execute them.
 * We pass a table of command callbacks for that 
 */

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

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

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

  /*if (terminal)*/ fprintf(stdout, "[%s%s]\n", path, name);

  return 1;
}

/*
 * Sec Desc print functions 
 */

void print_type(unsigned char type)
{
  switch (type) {
  case 0x00:
    fprintf(stdout, "    ALLOW");
    break;
  case 0x01:
    fprintf(stdout, "     DENY");
    break;
  case 0x02:
    fprintf(stdout, "    AUDIT");
    break;
  case 0x03:
    fprintf(stdout, "    ALARM");
    break;
  case 0x04:
    fprintf(stdout, "ALLOW CPD");
    break;
  case 0x05:
    fprintf(stdout, "OBJ ALLOW");
    break;
  case 0x06:
    fprintf(stdout, " OBJ DENY");
  default:
    fprintf(stdout, "  UNKNOWN");
    break;
  }
}

void print_flags(unsigned char flags)
{
  char flg_output[21];
  int some = 0;

  flg_output[0] = 0;
  if (!flags) {
    fprintf(stdout, "         ");
    return;
  }
  if (flags & 0x01) {
    if (some) strcat(flg_output, ",");
    some = 1;
    strcat(flg_output, "OI");
  }
  if (flags & 0x02) {
    if (some) strcat(flg_output, ",");
    some = 1;
    strcat(flg_output, "CI");
  }
  if (flags & 0x04) {
    if (some) strcat(flg_output, ",");
    some = 1;
    strcat(flg_output, "NP");
  }
  if (flags & 0x08) {
    if (some) strcat(flg_output, ",");
    some = 1;
    strcat(flg_output, "IO");
  }
  if (flags & 0x10) {
    if (some) strcat(flg_output, ",");
    some = 1;
    strcat(flg_output, "IA");
  }
  if (flags == 0xF) {
    if (some) strcat(flg_output, ",");
    some = 1;
    strcat(flg_output, "VI");
  }
  fprintf(stdout, " %s", flg_output);
}

void print_perms(int perms)
{
  fprintf(stdout, " %8X", perms);
}

void print_sid(DOM_SID *sid)
{
  int i, comps = sid->auths;
  fprintf(stdout, "S-%u-%u", sid->ver, sid->auth[5]);

  for (i = 0; i < comps; i++) {

    fprintf(stdout, "-%u", sid->sub_auths[i]);

  }
  fprintf(stdout, "\n");
}

void print_acl(ACL *acl, char *prefix)
{
  int i;

  for (i = 0; i < acl->num_aces; i++) {
    fprintf(stdout, ";;%s", prefix);
    print_type(acl->aces[i]->type);
    print_flags(acl->aces[i]->flags);
    print_perms(acl->aces[i]->perms);
    fprintf(stdout, " ");
    print_sid(acl->aces[i]->trustee);
  }
}

int print_sec(SEC_DESC *sec_desc)
{
  if (!print_security) return 1;
  fprintf(stdout, ";;  SECURITY\n");
  fprintf(stdout, ";;   Owner: ");
  print_sid(sec_desc->owner);
  fprintf(stdout, ";;   Group: ");
  print_sid(sec_desc->group);
  if (sec_desc->sacl) {
    fprintf(stdout, ";;    SACL:\n");
    print_acl(sec_desc->sacl, " ");
  }
  if (sec_desc->dacl) {
    fprintf(stdout, ";;    DACL:\n");
    print_acl(sec_desc->dacl, " ");
  }
  return 1;
}

/*
 * Value print function here ...
 */
int print_val(const char *path, char *val_name, int val_type, int data_len, 
	      void *data_blk, int terminal, int first, int last)
{
  char data_asc[1024];

  bzero(data_asc, sizeof(data_asc));
  if (!terminal && first)
    fprintf(stdout, "%s\n", path);
  data_to_ascii((unsigned char *)data_blk, data_len, val_type, data_asc, 
		sizeof(data_asc) - 1);
  fprintf(stdout, "  %s = %s : %s\n", (val_name?val_name:"<No Name>"), 
		   val_to_str(val_type, reg_type_names), data_asc);
  return 1;
}

void usage(void)
{
  fprintf(stderr, "Usage: editreg [-v] [-p] [-k] [-s] [-c <command-file>] <registryfile>\n");
  fprintf(stderr, "Version: 0.1\n\n");
  fprintf(stderr, "\n\t-v\t sets verbose mode");
  fprintf(stderr, "\n\t-p\t prints the registry");
  fprintf(stderr, "\n\t-s\t prints security descriptors");
  fprintf(stderr, "\n\t-c <command-file>\t specifies a command file");
  fprintf(stderr, "\n");
}

int main(int argc, char *argv[])
{
  REGF *regf;
  extern char *optarg;
  extern int optind;
  int opt, print_keys = 0;
  int regf_opt = 1; /* Command name */
  int commands = 0;
  char *cmd_file_name = NULL;
  char *out_file_name = NULL;
  CMD_FILE *cmd_file = NULL;

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

  while ((opt = getopt(argc, argv, "spvko:c:")) != EOF) {
    switch (opt) {
    case 'c':
      commands = 1;
      cmd_file_name = optarg;
      regf_opt += 2;
      break;

    case 'o':
      out_file_name = optarg;
      regf_opt += 2;
      break;

    case 'p':
      print_keys++;
      regf_opt++;
      break;

    case 's':
      print_security++;
      regf_opt++;
      break;

    case 'v':
      verbose++;
      regf_opt++;
      break;

    case 'k':
      regf_opt++;
      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 (regf_opt < argc) { /* We have a registry file */
    if (!nt_set_regf_input_file(regf, argv[regf_opt])) {
      fprintf(stderr, "Could not set name of registry file: %s, %s\n", 
	      argv[regf_opt], 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);
    }
  }

  if (out_file_name) {
    if (!nt_set_regf_output_file(regf, out_file_name)) {
      fprintf(stderr, "Could not set name of output registry file: %s, %s\n", 
	      out_file_name, strerror(errno));
      exit(3);
    }

  }

  if (commands) {
    CMD *cmd;

    cmd_file = cmd_file_create(cmd_file_name);

    while ((cmd = cmd_file->cmd_ops.get_cmd(cmd_file->fd)) != NULL) {

      /*
       * Now, apply the requests to the tree ...
       */
      switch (cmd->cmd) {
      case CMD_ADD_KEY:

	break;

      case CMD_DEL_KEY:
	/* 
	 * Any value does not matter ...
	 * Find the key if it exists, and delete it ...
	 */
	
	nt_delete_key_by_name(regf, cmd->key);
	break;
      }
    }
    free_cmd(cmd);
  }

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

  if (print_keys) {
    nt_key_iterator(regf, regf->root, 0, "", print_key, print_sec, print_val);
  }

  return 0;
}