s3:registry: add db_context argument to regdb_delete_subkeylist()
[kai/samba.git] / source3 / registry / reg_backend_db.c
1 /* 
2  *  Unix SMB/CIFS implementation.
3  *  Virtual Windows Registry Layer
4  *  Copyright (C) Gerald Carter                     2002-2005
5  *
6  *  This program is free software; you can redistribute it and/or modify
7  *  it under the terms of the GNU General Public License as published by
8  *  the Free Software Foundation; either version 3 of the License, or
9  *  (at your option) any later version.
10  *  
11  *  This program is distributed in the hope that it will be useful,
12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14  *  GNU General Public License for more details.
15  *  
16  *  You should have received a copy of the GNU General Public License
17  *  along with this program; if not, see <http://www.gnu.org/licenses/>.
18  */
19
20 /* Implementation of internal registry database functions. */
21
22 #include "includes.h"
23
24 #undef DBGC_CLASS
25 #define DBGC_CLASS DBGC_REGISTRY
26
27 static struct db_context *regdb = NULL;
28 static int regdb_refcount;
29
30 static bool regdb_key_exists(const char *key);
31 static bool regdb_key_is_base_key(const char *key);
32
33 /* List the deepest path into the registry.  All part components will be created.*/
34
35 /* If you want to have a part of the path controlled by the tdb and part by
36    a virtual registry db (e.g. printing), then you have to list the deepest path.
37    For example,"HKLM/SOFTWARE/Microsoft/Windows NT/CurrentVersion/Print" 
38    allows the reg_db backend to handle everything up to 
39    "HKLM/SOFTWARE/Microsoft/Windows NT/CurrentVersion" and then we'll hook 
40    the reg_printing backend onto the last component of the path (see 
41    KEY_PRINTING_2K in include/rpc_reg.h)   --jerry */
42
43 static const char *builtin_registry_paths[] = {
44         KEY_PRINTING_2K,
45         KEY_PRINTING_PORTS,
46         KEY_PRINTING,
47         KEY_SHARES,
48         KEY_EVENTLOG,
49         KEY_SMBCONF,
50         KEY_PERFLIB,
51         KEY_PERFLIB_009,
52         KEY_GROUP_POLICY,
53         KEY_SAMBA_GROUP_POLICY,
54         KEY_GP_MACHINE_POLICY,
55         KEY_GP_MACHINE_WIN_POLICY,
56         KEY_HKCU,
57         KEY_GP_USER_POLICY,
58         KEY_GP_USER_WIN_POLICY,
59         KEY_WINLOGON_GPEXT_PATH,
60         "HKLM\\SYSTEM\\CurrentControlSet\\Control\\Print\\Monitors",
61         KEY_PROD_OPTIONS,
62         "HKLM\\SYSTEM\\CurrentControlSet\\Control\\Terminal Server\\DefaultUserConfiguration",
63         KEY_TCPIP_PARAMS,
64         KEY_NETLOGON_PARAMS,
65         KEY_HKU,
66         KEY_HKCR,
67         KEY_HKPD,
68         KEY_HKPT,
69          NULL };
70
71 struct builtin_regkey_value {
72         const char *path;
73         const char *valuename;
74         uint32 type;
75         union {
76                 const char *string;
77                 uint32 dw_value;
78         } data;
79 };
80
81 static struct builtin_regkey_value builtin_registry_values[] = {
82         { KEY_PRINTING_PORTS,
83                 SAMBA_PRINTER_PORT_NAME, REG_SZ, { "" } },
84         { KEY_PRINTING_2K,
85                 "DefaultSpoolDirectory", REG_SZ, { "C:\\Windows\\System32\\Spool\\Printers" } },
86         { KEY_EVENTLOG,
87                 "DisplayName", REG_SZ, { "Event Log" } }, 
88         { KEY_EVENTLOG,
89                 "ErrorControl", REG_DWORD, { (char*)0x00000001 } },
90         { NULL, NULL, 0, { NULL } }
91 };
92
93 /**
94  * Initialize a key in the registry:
95  * create each component key of the specified path.
96  */
97 static WERROR init_registry_key_internal(const char *add_path)
98 {
99         WERROR werr;
100         TALLOC_CTX *frame = talloc_stackframe();
101         char *path = NULL;
102         char *base = NULL;
103         char *remaining = NULL;
104         char *keyname;
105         char *subkeyname;
106         struct regsubkey_ctr *subkeys;
107         const char *p, *p2;
108
109         DEBUG(6, ("init_registry_key: Adding [%s]\n", add_path));
110
111         path = talloc_strdup(frame, add_path);
112         base = talloc_strdup(frame, "");
113         if (!path || !base) {
114                 werr = WERR_NOMEM;
115                 goto fail;
116         }
117         p = path;
118
119         while (next_token_talloc(frame, &p, &keyname, "\\")) {
120
121                 /* build up the registry path from the components */
122
123                 if (*base) {
124                         base = talloc_asprintf(frame, "%s\\", base);
125                         if (!base) {
126                                 werr = WERR_NOMEM;
127                                 goto fail;
128                         }
129                 }
130                 base = talloc_asprintf_append(base, "%s", keyname);
131                 if (!base) {
132                         werr = WERR_NOMEM;
133                         goto fail;
134                 }
135
136                 /* get the immediate subkeyname (if we have one ) */
137
138                 subkeyname = talloc_strdup(frame, "");
139                 if (!subkeyname) {
140                         werr = WERR_NOMEM;
141                         goto fail;
142                 }
143                 if (*p) {
144                         remaining = talloc_strdup(frame, p);
145                         if (!remaining) {
146                                 werr = WERR_NOMEM;
147                                 goto fail;
148                         }
149                         p2 = remaining;
150
151                         if (!next_token_talloc(frame, &p2,
152                                                 &subkeyname, "\\"))
153                         {
154                                 subkeyname = talloc_strdup(frame,p2);
155                                 if (!subkeyname) {
156                                         werr = WERR_NOMEM;
157                                         goto fail;
158                                 }
159                         }
160                 }
161
162                 DEBUG(10,("init_registry_key: Storing key [%s] with "
163                           "subkey [%s]\n", base,
164                           *subkeyname ? subkeyname : "NULL"));
165
166                 /* we don't really care if the lookup succeeds or not
167                  * since we are about to update the record.
168                  * We just want any subkeys already present */
169
170                 werr = regsubkey_ctr_init(frame, &subkeys);
171                 if (!W_ERROR_IS_OK(werr)) {
172                         DEBUG(0,("talloc() failure!\n"));
173                         goto fail;
174                 }
175
176                 regdb_fetch_keys(base, subkeys);
177                 if (*subkeyname) {
178                         werr = regsubkey_ctr_addkey(subkeys, subkeyname);
179                         if (!W_ERROR_IS_OK(werr)) {
180                                 goto fail;
181                         }
182                 }
183                 if (!regdb_store_keys( base, subkeys)) {
184                         werr = WERR_CAN_NOT_COMPLETE;
185                         goto fail;
186                 }
187         }
188
189         werr = WERR_OK;
190
191 fail:
192         TALLOC_FREE(frame);
193         return werr;
194 }
195
196 /**
197  * Initialize a key in the registry:
198  * create each component key of the specified path,
199  * wrapped in one db transaction.
200  */
201 WERROR init_registry_key(const char *add_path)
202 {
203         WERROR werr;
204
205         if (regdb_key_exists(add_path)) {
206                 return WERR_OK;
207         }
208
209         if (regdb->transaction_start(regdb) != 0) {
210                 DEBUG(0, ("init_registry_key: transaction_start failed\n"));
211                 return WERR_REG_IO_FAILURE;
212         }
213
214         werr = init_registry_key_internal(add_path);
215         if (!W_ERROR_IS_OK(werr)) {
216                 goto fail;
217         }
218
219         if (regdb->transaction_commit(regdb) != 0) {
220                 DEBUG(0, ("init_registry_key: Could not commit transaction\n"));
221                 return WERR_REG_IO_FAILURE;
222         }
223
224         return WERR_OK;
225
226 fail:
227         if (regdb->transaction_cancel(regdb) != 0) {
228                 smb_panic("init_registry_key: transaction_cancel failed\n");
229         }
230
231         return werr;
232 }
233
234 /***********************************************************************
235  Open the registry data in the tdb
236  ***********************************************************************/
237
238 WERROR init_registry_data(void)
239 {
240         WERROR werr;
241         TALLOC_CTX *frame = talloc_stackframe();
242         struct regval_ctr *values;
243         int i;
244         UNISTR2 data;
245
246         /*
247          * First, check for the existence of the needed keys and values.
248          * If all do already exist, we can save the writes.
249          */
250         for (i=0; builtin_registry_paths[i] != NULL; i++) {
251                 if (!regdb_key_exists(builtin_registry_paths[i])) {
252                         goto do_init;
253                 }
254         }
255
256         for (i=0; builtin_registry_values[i].path != NULL; i++) {
257                 values = TALLOC_ZERO_P(frame, struct regval_ctr);
258                 if (values == NULL) {
259                         werr = WERR_NOMEM;
260                         goto done;
261                 }
262
263                 regdb_fetch_values(builtin_registry_values[i].path, values);
264                 if (!regval_ctr_key_exists(values,
265                                         builtin_registry_values[i].valuename))
266                 {
267                         TALLOC_FREE(values);
268                         goto do_init;
269                 }
270
271                 TALLOC_FREE(values);
272         }
273
274         werr = WERR_OK;
275         goto done;
276
277 do_init:
278
279         /*
280          * There are potentially quite a few store operations which are all
281          * indiviually wrapped in tdb transactions. Wrapping them in a single
282          * transaction gives just a single transaction_commit() to actually do
283          * its fsync()s. See tdb/common/transaction.c for info about nested
284          * transaction behaviour.
285          */
286
287         if (regdb->transaction_start(regdb) != 0) {
288                 DEBUG(0, ("init_registry_data: tdb_transaction_start "
289                           "failed\n"));
290                 werr = WERR_REG_IO_FAILURE;
291                 goto done;
292         }
293
294         /* loop over all of the predefined paths and add each component */
295
296         for (i=0; builtin_registry_paths[i] != NULL; i++) {
297                 if (regdb_key_exists(builtin_registry_paths[i])) {
298                         continue;
299                 }
300                 werr = init_registry_key_internal(builtin_registry_paths[i]);
301                 if (!W_ERROR_IS_OK(werr)) {
302                         goto fail;
303                 }
304         }
305
306         /* loop over all of the predefined values and add each component */
307
308         for (i=0; builtin_registry_values[i].path != NULL; i++) {
309
310                 values = TALLOC_ZERO_P(frame, struct regval_ctr);
311                 if (values == NULL) {
312                         werr = WERR_NOMEM;
313                         goto fail;
314                 }
315
316                 regdb_fetch_values(builtin_registry_values[i].path, values);
317
318                 /* preserve existing values across restarts. Only add new ones */
319
320                 if (!regval_ctr_key_exists(values,
321                                         builtin_registry_values[i].valuename))
322                 {
323                         switch(builtin_registry_values[i].type) {
324                         case REG_DWORD:
325                                 regval_ctr_addvalue(values,
326                                         builtin_registry_values[i].valuename,
327                                         REG_DWORD,
328                                         (char*)&builtin_registry_values[i].data.dw_value,
329                                         sizeof(uint32));
330                                 break;
331
332                         case REG_SZ:
333                                 init_unistr2(&data,
334                                         builtin_registry_values[i].data.string,
335                                         UNI_STR_TERMINATE);
336                                 regval_ctr_addvalue(values,
337                                         builtin_registry_values[i].valuename,
338                                         REG_SZ,
339                                         (char*)data.buffer,
340                                         data.uni_str_len*sizeof(uint16));
341                                 break;
342
343                         default:
344                                 DEBUG(0, ("init_registry_data: invalid value "
345                                           "type in builtin_registry_values "
346                                           "[%d]\n",
347                                           builtin_registry_values[i].type));
348                         }
349                         regdb_store_values(builtin_registry_values[i].path,
350                                            values);
351                 }
352                 TALLOC_FREE(values);
353         }
354
355         if (regdb->transaction_commit(regdb) != 0) {
356                 DEBUG(0, ("init_registry_data: Could not commit "
357                           "transaction\n"));
358                 werr = WERR_REG_IO_FAILURE;
359         } else {
360                 werr = WERR_OK;
361         }
362
363         goto done;
364
365 fail:
366         if (regdb->transaction_cancel(regdb) != 0) {
367                 smb_panic("init_registry_data: tdb_transaction_cancel "
368                           "failed\n");
369         }
370
371 done:
372         TALLOC_FREE(frame);
373         return werr;
374 }
375
376 /***********************************************************************
377  Open the registry database
378  ***********************************************************************/
379  
380 WERROR regdb_init(void)
381 {
382         const char *vstring = "INFO/version";
383         uint32 vers_id;
384         WERROR werr;
385
386         if (regdb) {
387                 DEBUG(10, ("regdb_init: incrementing refcount (%d)\n",
388                           regdb_refcount));
389                 regdb_refcount++;
390                 return WERR_OK;
391         }
392
393         regdb = db_open(NULL, state_path("registry.tdb"), 0,
394                               REG_TDB_FLAGS, O_RDWR, 0600);
395         if (!regdb) {
396                 regdb = db_open(NULL, state_path("registry.tdb"), 0,
397                                       REG_TDB_FLAGS, O_RDWR|O_CREAT, 0600);
398                 if (!regdb) {
399                         werr = ntstatus_to_werror(map_nt_error_from_unix(errno));
400                         DEBUG(1,("regdb_init: Failed to open registry %s (%s)\n",
401                                 state_path("registry.tdb"), strerror(errno) ));
402                         return werr;
403                 }
404                 
405                 DEBUG(10,("regdb_init: Successfully created registry tdb\n"));
406         }
407
408         regdb_refcount = 1;
409
410         vers_id = dbwrap_fetch_int32(regdb, vstring);
411
412         if ( vers_id != REGVER_V1 ) {
413                 NTSTATUS status;
414                 /* any upgrade code here if needed */
415                 DEBUG(10, ("regdb_init: got %s = %d != %d\n", vstring,
416                            vers_id, REGVER_V1));
417                 status = dbwrap_trans_store_int32(regdb, vstring, REGVER_V1);
418                 if (!NT_STATUS_IS_OK(status)) {
419                         DEBUG(1, ("regdb_init: error storing %s = %d: %s\n",
420                                   vstring, REGVER_V1, nt_errstr(status)));
421                         return ntstatus_to_werror(status);
422                 } else {
423                         DEBUG(10, ("regdb_init: stored %s = %d\n",
424                                   vstring, REGVER_V1));
425                 }
426         }
427
428         return WERR_OK;
429 }
430
431 /***********************************************************************
432  Open the registry.  Must already have been initialized by regdb_init()
433  ***********************************************************************/
434
435 WERROR regdb_open( void )
436 {
437         WERROR result = WERR_OK;
438
439         if ( regdb ) {
440                 DEBUG(10,("regdb_open: incrementing refcount (%d)\n", regdb_refcount));
441                 regdb_refcount++;
442                 return WERR_OK;
443         }
444         
445         become_root();
446
447         regdb = db_open(NULL, state_path("registry.tdb"), 0,
448                               REG_TDB_FLAGS, O_RDWR, 0600);
449         if ( !regdb ) {
450                 result = ntstatus_to_werror( map_nt_error_from_unix( errno ) );
451                 DEBUG(0,("regdb_open: Failed to open %s! (%s)\n", 
452                         state_path("registry.tdb"), strerror(errno) ));
453         }
454
455         unbecome_root();
456
457         regdb_refcount = 1;
458         DEBUG(10,("regdb_open: refcount reset (%d)\n", regdb_refcount));
459
460         return result;
461 }
462
463 /***********************************************************************
464  ***********************************************************************/
465
466 int regdb_close( void )
467 {
468         if (regdb_refcount == 0) {
469                 return 0;
470         }
471
472         regdb_refcount--;
473
474         DEBUG(10,("regdb_close: decrementing refcount (%d)\n", regdb_refcount));
475
476         if ( regdb_refcount > 0 )
477                 return 0;
478
479         SMB_ASSERT( regdb_refcount >= 0 );
480
481         TALLOC_FREE(regdb);
482         return 0;
483 }
484
485 WERROR regdb_transaction_start(void)
486 {
487         return (regdb->transaction_start(regdb) == 0) ?
488                 WERR_OK : WERR_REG_IO_FAILURE;
489 }
490
491 WERROR regdb_transaction_commit(void)
492 {
493         return (regdb->transaction_commit(regdb) == 0) ?
494                 WERR_OK : WERR_REG_IO_FAILURE;
495 }
496
497 WERROR regdb_transaction_cancel(void)
498 {
499         return (regdb->transaction_cancel(regdb) == 0) ?
500                 WERR_OK : WERR_REG_IO_FAILURE;
501 }
502
503 /***********************************************************************
504  return the tdb sequence number of the registry tdb.
505  this is an indicator for the content of the registry
506  having changed. it will change upon regdb_init, too, though.
507  ***********************************************************************/
508 int regdb_get_seqnum(void)
509 {
510         return regdb->get_seqnum(regdb);
511 }
512
513
514 static WERROR regdb_delete_key_with_prefix(struct db_context *db,
515                                            const char *keyname,
516                                            const char *prefix)
517 {
518         char *path;
519         WERROR werr = WERR_NOMEM;
520         TALLOC_CTX *mem_ctx = talloc_stackframe();
521
522         if (keyname == NULL) {
523                 werr = WERR_INVALID_PARAM;
524                 goto done;
525         }
526
527         if (prefix == NULL) {
528                 path = discard_const_p(char, keyname);
529         } else {
530                 path = talloc_asprintf(mem_ctx, "%s/%s", prefix, keyname);
531                 if (path == NULL) {
532                         goto done;
533                 }
534         }
535
536         path = normalize_reg_path(mem_ctx, path);
537         if (path == NULL) {
538                 goto done;
539         }
540
541         werr = ntstatus_to_werror(dbwrap_delete_bystring(db, path));
542
543         /* treat "not" found" as ok */
544         if (W_ERROR_EQUAL(werr, WERR_NOT_FOUND)) {
545                 werr = WERR_OK;
546         }
547
548 done:
549         talloc_free(mem_ctx);
550         return werr;
551 }
552
553
554 static WERROR regdb_delete_values(struct db_context *db, const char *keyname)
555 {
556         return regdb_delete_key_with_prefix(db, keyname, REG_VALUE_PREFIX);
557 }
558
559 static WERROR regdb_delete_secdesc(struct db_context *db, const char *keyname)
560 {
561         return regdb_delete_key_with_prefix(db, keyname, REG_SECDESC_PREFIX);
562 }
563
564 static WERROR regdb_delete_subkeylist(struct db_context *db, const char *keyname)
565 {
566         return regdb_delete_key_with_prefix(db, keyname, NULL);
567 }
568
569 static WERROR regdb_delete_key_lists(const char *keyname)
570 {
571         WERROR werr;
572
573         werr = regdb_delete_values(regdb, keyname);
574         if (!W_ERROR_IS_OK(werr)) {
575                 DEBUG(1, (__location__ " Deleting %s/%s failed: %s\n",
576                           REG_VALUE_PREFIX, keyname, win_errstr(werr)));
577                 goto done;
578         }
579
580         werr = regdb_delete_secdesc(regdb, keyname);
581         if (!W_ERROR_IS_OK(werr)) {
582                 DEBUG(1, (__location__ " Deleting %s/%s failed: %s\n",
583                           REG_SECDESC_PREFIX, keyname, win_errstr(werr)));
584                 goto done;
585         }
586
587         werr = regdb_delete_subkeylist(regdb, keyname);
588         if (!W_ERROR_IS_OK(werr)) {
589                 DEBUG(1, (__location__ " Deleting %s failed: %s\n",
590                           keyname, win_errstr(werr)));
591                 goto done;
592         }
593
594 done:
595         return werr;
596 }
597
598 /***********************************************************************
599  Add subkey strings to the registry tdb under a defined key
600  fmt is the same format as tdb_pack except this function only supports
601  fstrings
602  ***********************************************************************/
603
604 static bool regdb_store_keys_internal(const char *key, struct regsubkey_ctr *ctr)
605 {
606         TDB_DATA dbuf;
607         uint8 *buffer = NULL;
608         int i = 0;
609         uint32 len, buflen;
610         bool ret = true;
611         uint32 num_subkeys = regsubkey_ctr_numkeys(ctr);
612         char *keyname = NULL;
613         TALLOC_CTX *ctx = talloc_stackframe();
614         NTSTATUS status;
615
616         if (!key) {
617                 return false;
618         }
619
620         keyname = talloc_strdup(ctx, key);
621         if (!keyname) {
622                 return false;
623         }
624         keyname = normalize_reg_path(ctx, keyname);
625
626         /* allocate some initial memory */
627
628         buffer = (uint8 *)SMB_MALLOC(1024);
629         if (buffer == NULL) {
630                 return false;
631         }
632         buflen = 1024;
633         len = 0;
634
635         /* store the number of subkeys */
636
637         len += tdb_pack(buffer+len, buflen-len, "d", num_subkeys);
638
639         /* pack all the strings */
640
641         for (i=0; i<num_subkeys; i++) {
642                 size_t thistime;
643
644                 thistime = tdb_pack(buffer+len, buflen-len, "f",
645                                     regsubkey_ctr_specific_key(ctr, i));
646                 if (len+thistime > buflen) {
647                         size_t thistime2;
648                         /*
649                          * tdb_pack hasn't done anything because of the short
650                          * buffer, allocate extra space.
651                          */
652                         buffer = SMB_REALLOC_ARRAY(buffer, uint8_t,
653                                                    (len+thistime)*2);
654                         if(buffer == NULL) {
655                                 DEBUG(0, ("regdb_store_keys: Failed to realloc "
656                                           "memory of size [%u]\n",
657                                           (unsigned int)(len+thistime)*2));
658                                 ret = false;
659                                 goto done;
660                         }
661                         buflen = (len+thistime)*2;
662                         thistime2 = tdb_pack(
663                                 buffer+len, buflen-len, "f",
664                                 regsubkey_ctr_specific_key(ctr, i));
665                         if (thistime2 != thistime) {
666                                 DEBUG(0, ("tdb_pack failed\n"));
667                                 ret = false;
668                                 goto done;
669                         }
670                 }
671                 len += thistime;
672         }
673
674         /* finally write out the data */
675
676         dbuf.dptr = buffer;
677         dbuf.dsize = len;
678         status = dbwrap_store_bystring(regdb, keyname, dbuf, TDB_REPLACE);
679         if (!NT_STATUS_IS_OK(status)) {
680                 ret = false;
681                 goto done;
682         }
683
684         /*
685          * Delete a sorted subkey cache for regdb_key_exists, will be
686          * recreated automatically
687          */
688         keyname = talloc_asprintf(ctx, "%s/%s", REG_SORTED_SUBKEYS_PREFIX,
689                                   keyname);
690         if (keyname != NULL) {
691                 dbwrap_delete_bystring(regdb, keyname);
692         }
693
694 done:
695         TALLOC_FREE(ctx);
696         SAFE_FREE(buffer);
697         return ret;
698 }
699
700 /***********************************************************************
701  Store the new subkey record and create any child key records that
702  do not currently exist
703  ***********************************************************************/
704
705 bool regdb_store_keys(const char *key, struct regsubkey_ctr *ctr)
706 {
707         int num_subkeys, old_num_subkeys, i;
708         char *path = NULL;
709         struct regsubkey_ctr *subkeys = NULL, *old_subkeys = NULL;
710         char *oldkeyname = NULL;
711         TALLOC_CTX *ctx = talloc_stackframe();
712         WERROR werr;
713
714         if (!regdb_key_is_base_key(key) && !regdb_key_exists(key)) {
715                 goto fail;
716         }
717
718         /*
719          * fetch a list of the old subkeys so we can determine if anything has
720          * changed
721          */
722
723         werr = regsubkey_ctr_init(ctx, &old_subkeys);
724         if (!W_ERROR_IS_OK(werr)) {
725                 DEBUG(0,("regdb_store_keys: talloc() failure!\n"));
726                 return false;
727         }
728
729         regdb_fetch_keys(key, old_subkeys);
730
731         num_subkeys = regsubkey_ctr_numkeys(ctr);
732         old_num_subkeys = regsubkey_ctr_numkeys(old_subkeys);
733         if ((num_subkeys && old_num_subkeys) &&
734             (num_subkeys == old_num_subkeys)) {
735
736                 for (i = 0; i < num_subkeys; i++) {
737                         if (strcmp(regsubkey_ctr_specific_key(ctr, i),
738                                    regsubkey_ctr_specific_key(old_subkeys, i))
739                             != 0)
740                         {
741                                 break;
742                         }
743                 }
744                 if (i == num_subkeys) {
745                         /*
746                          * Nothing changed, no point to even start a tdb
747                          * transaction
748                          */
749                         TALLOC_FREE(old_subkeys);
750                         return true;
751                 }
752         }
753
754         TALLOC_FREE(old_subkeys);
755
756         if (regdb->transaction_start(regdb) != 0) {
757                 DEBUG(0, ("regdb_store_keys: transaction_start failed\n"));
758                 goto fail;
759         }
760
761         /*
762          * Re-fetch the old keys inside the transaction
763          */
764
765         werr = regsubkey_ctr_init(ctx, &old_subkeys);
766         if (!W_ERROR_IS_OK(werr)) {
767                 DEBUG(0,("regdb_store_keys: talloc() failure!\n"));
768                 goto cancel;
769         }
770
771         regdb_fetch_keys(key, old_subkeys);
772
773         /*
774          * Make the store operation as safe as possible without transactions:
775          *
776          * (1) For each subkey removed from ctr compared with old_subkeys:
777          *
778          *     (a) First delete the value db entry.
779          *
780          *     (b) Next delete the secdesc db record.
781          *
782          *     (c) Then delete the subkey list entry.
783          *
784          * (2) Now write the list of subkeys of the parent key,
785          *     deleting removed entries and adding new ones.
786          *
787          * (3) Finally create the subkey list entries for the added keys.
788          *
789          * This way if we crash half-way in between deleting the subkeys
790          * and storing the parent's list of subkeys, no old data can pop up
791          * out of the blue when re-adding keys later on.
792          */
793
794         /* (1) delete removed keys' lists (values/secdesc/subkeys) */
795
796         num_subkeys = regsubkey_ctr_numkeys(old_subkeys);
797         for (i=0; i<num_subkeys; i++) {
798                 oldkeyname = regsubkey_ctr_specific_key(old_subkeys, i);
799
800                 if (regsubkey_ctr_key_exists(ctr, oldkeyname)) {
801                         /*
802                          * It's still around, don't delete
803                          */
804
805                         continue;
806                 }
807
808                 path = talloc_asprintf(ctx, "%s/%s", key, oldkeyname);
809                 if (!path) {
810                         goto cancel;
811                 }
812
813                 werr = regdb_delete_key_lists(path);
814                 W_ERROR_NOT_OK_GOTO(werr, cancel);
815
816                 TALLOC_FREE(path);
817         }
818
819         TALLOC_FREE(old_subkeys);
820
821         /* (2) store the subkey list for the parent */
822
823         if (!regdb_store_keys_internal(key, ctr) ) {
824                 DEBUG(0,("regdb_store_keys: Failed to store new subkey list "
825                          "for parent [%s]\n", key));
826                 goto cancel;
827         }
828
829         /* (3) now create records for any subkeys that don't already exist */
830
831         num_subkeys = regsubkey_ctr_numkeys(ctr);
832
833         if (num_subkeys == 0) {
834                 werr = regsubkey_ctr_init(ctx, &subkeys);
835                 if (!W_ERROR_IS_OK(werr)) {
836                         DEBUG(0,("regdb_store_keys: talloc() failure!\n"));
837                         goto cancel;
838                 }
839
840                 if (!regdb_store_keys_internal(key, subkeys)) {
841                         DEBUG(0,("regdb_store_keys: Failed to store "
842                                  "new record for key [%s]\n", key));
843                         goto cancel;
844                 }
845                 TALLOC_FREE(subkeys);
846
847         }
848
849         for (i=0; i<num_subkeys; i++) {
850                 path = talloc_asprintf(ctx, "%s/%s",
851                                         key,
852                                         regsubkey_ctr_specific_key(ctr, i));
853                 if (!path) {
854                         goto cancel;
855                 }
856                 werr = regsubkey_ctr_init(ctx, &subkeys);
857                 if (!W_ERROR_IS_OK(werr)) {
858                         DEBUG(0,("regdb_store_keys: talloc() failure!\n"));
859                         goto cancel;
860                 }
861
862                 if (regdb_fetch_keys( path, subkeys ) == -1) {
863                         /* create a record with 0 subkeys */
864                         if (!regdb_store_keys_internal(path, subkeys)) {
865                                 DEBUG(0,("regdb_store_keys: Failed to store "
866                                          "new record for key [%s]\n", path));
867                                 goto cancel;
868                         }
869                 }
870
871                 TALLOC_FREE(subkeys);
872                 TALLOC_FREE(path);
873         }
874
875         if (regdb->transaction_commit(regdb) != 0) {
876                 DEBUG(0, ("regdb_store_keys: Could not commit transaction\n"));
877                 goto fail;
878         }
879
880         TALLOC_FREE(ctx);
881         return true;
882
883 cancel:
884         if (regdb->transaction_cancel(regdb) != 0) {
885                 smb_panic("regdb_store_keys: transaction_cancel failed\n");
886         }
887
888 fail:
889         TALLOC_FREE(ctx);
890
891         return false;
892 }
893
894 static WERROR regdb_create_subkey(const char *key, const char *subkey)
895 {
896         WERROR werr;
897         struct regsubkey_ctr *subkeys;
898         TALLOC_CTX *mem_ctx = talloc_stackframe();
899
900         if (!regdb_key_is_base_key(key) && !regdb_key_exists(key)) {
901                 werr = WERR_NOT_FOUND;
902                 goto done;
903         }
904
905         werr = regsubkey_ctr_init(mem_ctx, &subkeys);
906         W_ERROR_NOT_OK_GOTO_DONE(werr);
907
908         if (regdb_fetch_keys(key, subkeys) < 0) {
909                 werr = WERR_REG_IO_FAILURE;
910                 goto done;
911         }
912
913         if (regsubkey_ctr_key_exists(subkeys, subkey)) {
914                 werr = WERR_OK;
915                 goto done;
916         }
917
918         talloc_free(subkeys);
919
920         werr = regdb_transaction_start();
921         W_ERROR_NOT_OK_GOTO_DONE(werr);
922
923         werr = regsubkey_ctr_init(mem_ctx, &subkeys);
924         W_ERROR_NOT_OK_GOTO(werr, cancel);
925
926         if (regdb_fetch_keys(key, subkeys) < 0) {
927                 werr = WERR_REG_IO_FAILURE;
928                 goto cancel;
929         }
930
931         werr = regsubkey_ctr_addkey(subkeys, subkey);
932         W_ERROR_NOT_OK_GOTO(werr, cancel);
933
934         if (!regdb_store_keys_internal(key, subkeys)) {
935                 DEBUG(0, (__location__ " failed to store new subkey list for "
936                          "parent key %s\n", key));
937                 werr = WERR_REG_IO_FAILURE;
938                 goto cancel;
939         }
940
941         werr = regdb_transaction_commit();
942         if (!W_ERROR_IS_OK(werr)) {
943                 DEBUG(0, (__location__ " failed to commit transaction: %s\n",
944                          win_errstr(werr)));
945         }
946
947         goto done;
948
949 cancel:
950         werr = regdb_transaction_cancel();
951         if (!W_ERROR_IS_OK(werr)) {
952                 DEBUG(0, (__location__ " failed to cancel transaction: %s\n",
953                          win_errstr(werr)));
954         }
955
956 done:
957         talloc_free(mem_ctx);
958         return werr;
959 }
960
961 static WERROR regdb_delete_subkey(const char *key, const char *subkey)
962 {
963         WERROR werr, werr2;
964         struct regsubkey_ctr *subkeys;
965         char *path;
966         TALLOC_CTX *mem_ctx = talloc_stackframe();
967
968         if (!regdb_key_is_base_key(key) && !regdb_key_exists(key)) {
969                 werr = WERR_NOT_FOUND;
970                 goto done;
971         }
972
973         path = talloc_asprintf(mem_ctx, "%s/%s", key, subkey);
974         if (path == NULL) {
975                 werr = WERR_NOMEM;
976                 goto done;
977         }
978
979         if (!regdb_key_exists(path)) {
980                 werr = WERR_OK;
981                 goto done;
982         }
983
984         werr = regdb_transaction_start();
985         W_ERROR_NOT_OK_GOTO_DONE(werr);
986
987         werr = regdb_delete_key_lists(path);
988         W_ERROR_NOT_OK_GOTO(werr, cancel);
989
990         werr = regsubkey_ctr_init(mem_ctx, &subkeys);
991         W_ERROR_NOT_OK_GOTO(werr, cancel);
992
993         if (regdb_fetch_keys(key, subkeys) < 0) {
994                 werr = WERR_REG_IO_FAILURE;
995                 goto cancel;
996         }
997
998         werr = regsubkey_ctr_delkey(subkeys, subkey);
999         W_ERROR_NOT_OK_GOTO(werr, cancel);
1000
1001         if (!regdb_store_keys_internal(key, subkeys)) {
1002                 DEBUG(0, (__location__ " failed to store new subkey_list for "
1003                          "parent key %s\n", key));
1004                 werr = WERR_REG_IO_FAILURE;
1005                 goto cancel;
1006         }
1007
1008         werr = regdb_transaction_commit();
1009         if (!W_ERROR_IS_OK(werr)) {
1010                 DEBUG(0, (__location__ " failed to commit transaction: %s\n",
1011                          win_errstr(werr)));
1012         }
1013
1014         goto done;
1015
1016 cancel:
1017         werr2 = regdb_transaction_cancel();
1018         if (!W_ERROR_IS_OK(werr2)) {
1019                 DEBUG(0, (__location__ " failed to cancel transaction: %s\n",
1020                          win_errstr(werr2)));
1021         }
1022
1023 done:
1024         talloc_free(mem_ctx);
1025         return werr;
1026 }
1027
1028 static TDB_DATA regdb_fetch_key_internal(TALLOC_CTX *mem_ctx, const char *key)
1029 {
1030         char *path = NULL;
1031         TDB_DATA data;
1032
1033         path = normalize_reg_path(mem_ctx, key);
1034         if (!path) {
1035                 return make_tdb_data(NULL, 0);
1036         }
1037
1038         data = dbwrap_fetch_bystring(regdb, mem_ctx, path);
1039
1040         TALLOC_FREE(path);
1041         return data;
1042 }
1043
1044
1045 /**
1046  * check whether a given key name represents a base key,
1047  * i.e one without a subkey separator ('/' or '\').
1048  */
1049 static bool regdb_key_is_base_key(const char *key)
1050 {
1051         TALLOC_CTX *mem_ctx = talloc_stackframe();
1052         bool ret = false;
1053         char *path;
1054
1055         if (key == NULL) {
1056                 goto done;
1057         }
1058
1059         path = normalize_reg_path(mem_ctx, key);
1060         if (path == NULL) {
1061                 DEBUG(0, ("out of memory! (talloc failed)\n"));
1062                 goto done;
1063         }
1064
1065         if (*path == '\0') {
1066                 goto done;
1067         }
1068
1069         ret = (strrchr(path, '/') == NULL);
1070
1071 done:
1072         TALLOC_FREE(mem_ctx);
1073         return ret;
1074 }
1075
1076 /*
1077  * regdb_key_exists() is a very frequent operation. It can be quite
1078  * time-consuming to fully fetch the parent's subkey list, talloc_strdup all
1079  * subkeys and then compare the keyname linearly to all the parent's subkeys.
1080  *
1081  * The following code tries to make this operation as efficient as possible:
1082  * Per registry key we create a list of subkeys that is very efficient to
1083  * search for existence of a subkey. Its format is:
1084  *
1085  * 4 bytes num_subkeys
1086  * 4*num_subkey bytes offset into the string array
1087  * then follows a sorted list of subkeys in uppercase
1088  *
1089  * This record is created by create_sorted_subkeys() on demand if it does not
1090  * exist. scan_parent_subkeys() uses regdb->parse_record to search the sorted
1091  * list, the parsing code and the binary search can be found in
1092  * parent_subkey_scanner. The code uses parse_record() to avoid a memcpy of
1093  * the potentially large subkey record.
1094  *
1095  * The sorted subkey record is deleted in regdb_store_keys_internal and
1096  * recreated on demand.
1097  */
1098
1099 static int cmp_keynames(const void *p1, const void *p2)
1100 {
1101         return StrCaseCmp(*((char **)p1), *((char **)p2));
1102 }
1103
1104 static bool create_sorted_subkeys(const char *key, const char *sorted_keyname)
1105 {
1106         char **sorted_subkeys;
1107         struct regsubkey_ctr *ctr;
1108         bool result = false;
1109         NTSTATUS status;
1110         char *buf;
1111         char *p;
1112         int i, res;
1113         size_t len;
1114         int num_subkeys;
1115         WERROR werr;
1116
1117         if (regdb->transaction_start(regdb) != 0) {
1118                 DEBUG(0, ("create_sorted_subkeys: transaction_start "
1119                           "failed\n"));
1120                 return false;
1121         }
1122
1123         werr = regsubkey_ctr_init(talloc_tos(), &ctr);
1124         if (!W_ERROR_IS_OK(werr)) {
1125                 goto fail;
1126         }
1127
1128         res = regdb_fetch_keys(key, ctr);
1129         if (res == -1) {
1130                 goto fail;
1131         }
1132
1133         num_subkeys = regsubkey_ctr_numkeys(ctr);
1134         sorted_subkeys = talloc_array(ctr, char *, num_subkeys);
1135         if (sorted_subkeys == NULL) {
1136                 goto fail;
1137         }
1138
1139         len = 4 + 4*num_subkeys;
1140
1141         for (i = 0; i < num_subkeys; i++) {
1142                 sorted_subkeys[i] = talloc_strdup_upper(sorted_subkeys,
1143                                         regsubkey_ctr_specific_key(ctr, i));
1144                 if (sorted_subkeys[i] == NULL) {
1145                         goto fail;
1146                 }
1147                 len += strlen(sorted_subkeys[i])+1;
1148         }
1149
1150         qsort(sorted_subkeys, num_subkeys, sizeof(char *), cmp_keynames);
1151
1152         buf = talloc_array(ctr, char, len);
1153         if (buf == NULL) {
1154                 goto fail;
1155         }
1156         p = buf + 4 + 4*num_subkeys;
1157
1158         SIVAL(buf, 0, num_subkeys);
1159
1160         for (i=0; i < num_subkeys; i++) {
1161                 ptrdiff_t offset = p - buf;
1162                 SIVAL(buf, 4 + 4*i, offset);
1163                 strlcpy(p, sorted_subkeys[i], len-offset);
1164                 p += strlen(sorted_subkeys[i]) + 1;
1165         }
1166
1167         status = dbwrap_store_bystring(
1168                 regdb, sorted_keyname, make_tdb_data((uint8_t *)buf, len),
1169                 TDB_REPLACE);
1170         if (!NT_STATUS_IS_OK(status)) {
1171                 /*
1172                  * Don't use a "goto fail;" here, this would commit the broken
1173                  * transaction. See below for an explanation.
1174                  */
1175                 if (regdb->transaction_cancel(regdb) == -1) {
1176                         DEBUG(0, ("create_sorted_subkeys: transaction_cancel "
1177                                   "failed\n"));
1178                 }
1179                 TALLOC_FREE(ctr);
1180                 return false;
1181         }
1182
1183         result = true;
1184  fail:
1185         /*
1186          * We only get here via the "goto fail" when we did not write anything
1187          * yet. Using transaction_commit even in a failure case is necessary
1188          * because this (disposable) call might be nested in other
1189          * transactions. Doing a cancel here would destroy the possibility of
1190          * a transaction_commit for transactions that we might be wrapped in.
1191          */
1192         if (regdb->transaction_commit(regdb) == -1) {
1193                 DEBUG(0, ("create_sorted_subkeys: transaction_start "
1194                           "failed\n"));
1195                 goto fail;
1196         }
1197
1198         TALLOC_FREE(ctr);
1199         return result;
1200 }
1201
1202 struct scan_subkey_state {
1203         char *name;
1204         bool scanned;
1205         bool found;
1206 };
1207
1208 static int parent_subkey_scanner(TDB_DATA key, TDB_DATA data,
1209                                  void *private_data)
1210 {
1211         struct scan_subkey_state *state =
1212                 (struct scan_subkey_state *)private_data;
1213         uint32_t num_subkeys;
1214         uint32_t l, u;
1215
1216         if (data.dsize < sizeof(uint32_t)) {
1217                 return -1;
1218         }
1219
1220         state->scanned = true;
1221         state->found = false;
1222
1223         tdb_unpack(data.dptr, data.dsize, "d", &num_subkeys);
1224
1225         l = 0;
1226         u = num_subkeys;
1227
1228         while (l < u) {
1229                 uint32_t idx = (l+u)/2;
1230                 char *s = (char *)data.dptr + IVAL(data.dptr, 4 + 4*idx);
1231                 int comparison = strcmp(state->name, s);
1232
1233                 if (comparison < 0) {
1234                         u = idx;
1235                 } else if (comparison > 0) {
1236                         l = idx + 1;
1237                 } else {
1238                         state->found = true;
1239                         return 0;
1240                 }
1241         }
1242         return 0;
1243 }
1244
1245 static bool scan_parent_subkeys(const char *parent, const char *name)
1246 {
1247         char *path = NULL;
1248         char *key = NULL;
1249         struct scan_subkey_state state = { 0, };
1250         bool result = false;
1251         int res;
1252
1253         state.name = NULL;
1254
1255         path = normalize_reg_path(talloc_tos(), parent);
1256         if (path == NULL) {
1257                 goto fail;
1258         }
1259
1260         key = talloc_asprintf(talloc_tos(), "%s/%s",
1261                               REG_SORTED_SUBKEYS_PREFIX, path);
1262         if (key == NULL) {
1263                 goto fail;
1264         }
1265
1266         state.name = talloc_strdup_upper(talloc_tos(), name);
1267         if (state.name == NULL) {
1268                 goto fail;
1269         }
1270         state.scanned = false;
1271
1272         res = regdb->parse_record(regdb, string_term_tdb_data(key),
1273                                   parent_subkey_scanner, &state);
1274
1275         if (state.scanned) {
1276                 result = state.found;
1277         } else {
1278                 if (!create_sorted_subkeys(path, key)) {
1279                         goto fail;
1280                 }
1281                 res = regdb->parse_record(regdb, string_term_tdb_data(key),
1282                                           parent_subkey_scanner, &state);
1283                 if ((res == 0) && (state.scanned)) {
1284                         result = state.found;
1285                 }
1286         }
1287
1288  fail:
1289         TALLOC_FREE(path);
1290         TALLOC_FREE(state.name);
1291         return result;
1292 }
1293
1294 /**
1295  * Check for the existence of a key.
1296  *
1297  * Existence of a key is authoritatively defined by its
1298  * existence in the list of subkeys of its parent key.
1299  * The exeption of this are keys without a parent key,
1300  * i.e. the "base" keys (HKLM, HKCU, ...).
1301  */
1302 static bool regdb_key_exists(const char *key)
1303 {
1304         TALLOC_CTX *mem_ctx = talloc_stackframe();
1305         TDB_DATA value;
1306         bool ret = false;
1307         char *path, *p;
1308
1309         if (key == NULL) {
1310                 goto done;
1311         }
1312
1313         path = normalize_reg_path(mem_ctx, key);
1314         if (path == NULL) {
1315                 DEBUG(0, ("out of memory! (talloc failed)\n"));
1316                 goto done;
1317         }
1318
1319         if (*path == '\0') {
1320                 goto done;
1321         }
1322
1323         p = strrchr(path, '/');
1324         if (p == NULL) {
1325                 /* this is a base key */
1326                 value = regdb_fetch_key_internal(mem_ctx, path);
1327                 ret = (value.dptr != NULL);
1328         } else {
1329                 *p = '\0';
1330                 ret = scan_parent_subkeys(path, p+1);
1331         }
1332
1333 done:
1334         TALLOC_FREE(mem_ctx);
1335         return ret;
1336 }
1337
1338
1339 /***********************************************************************
1340  Retrieve an array of strings containing subkeys.  Memory should be
1341  released by the caller.
1342  ***********************************************************************/
1343
1344 int regdb_fetch_keys(const char *key, struct regsubkey_ctr *ctr)
1345 {
1346         WERROR werr;
1347         uint32 num_items;
1348         uint8 *buf;
1349         uint32 buflen, len;
1350         int i;
1351         fstring subkeyname;
1352         int ret = -1;
1353         TALLOC_CTX *frame = talloc_stackframe();
1354         TDB_DATA value;
1355
1356         DEBUG(11,("regdb_fetch_keys: Enter key => [%s]\n", key ? key : "NULL"));
1357
1358         if (!regdb_key_exists(key)) {
1359                 goto done;
1360         }
1361
1362         werr = regsubkey_ctr_set_seqnum(ctr, regdb_get_seqnum());
1363         if (!W_ERROR_IS_OK(werr)) {
1364                 goto done;
1365         }
1366
1367         value = regdb_fetch_key_internal(frame, key);
1368
1369         if (value.dptr == NULL) {
1370                 DEBUG(10, ("regdb_fetch_keys: no subkeys found for key [%s]\n",
1371                            key));
1372                 ret = 0;
1373                 goto done;
1374         }
1375
1376         buf = value.dptr;
1377         buflen = value.dsize;
1378         len = tdb_unpack( buf, buflen, "d", &num_items);
1379
1380         for (i=0; i<num_items; i++) {
1381                 len += tdb_unpack(buf+len, buflen-len, "f", subkeyname);
1382                 werr = regsubkey_ctr_addkey(ctr, subkeyname);
1383                 if (!W_ERROR_IS_OK(werr)) {
1384                         DEBUG(5, ("regdb_fetch_keys: regsubkey_ctr_addkey "
1385                                   "failed: %s\n", win_errstr(werr)));
1386                         goto done;
1387                 }
1388         }
1389
1390         DEBUG(11,("regdb_fetch_keys: Exit [%d] items\n", num_items));
1391
1392         ret = num_items;
1393 done:
1394         TALLOC_FREE(frame);
1395         return ret;
1396 }
1397
1398 /****************************************************************************
1399  Unpack a list of registry values frem the TDB
1400  ***************************************************************************/
1401
1402 static int regdb_unpack_values(struct regval_ctr *values, uint8 *buf, int buflen)
1403 {
1404         int             len = 0;
1405         uint32          type;
1406         fstring valuename;
1407         uint32          size;
1408         uint8           *data_p;
1409         uint32          num_values = 0;
1410         int             i;
1411
1412         /* loop and unpack the rest of the registry values */
1413
1414         len += tdb_unpack(buf+len, buflen-len, "d", &num_values);
1415
1416         for ( i=0; i<num_values; i++ ) {
1417                 /* unpack the next regval */
1418
1419                 type = REG_NONE;
1420                 size = 0;
1421                 data_p = NULL;
1422                 valuename[0] = '\0';
1423                 len += tdb_unpack(buf+len, buflen-len, "fdB",
1424                                   valuename,
1425                                   &type,
1426                                   &size,
1427                                   &data_p);
1428
1429                 /* add the new value. Paranoid protective code -- make sure data_p is valid */
1430
1431                 if (*valuename && size && data_p) {
1432                         regval_ctr_addvalue(values, valuename, type,
1433                                         (const char *)data_p, size);
1434                 }
1435                 SAFE_FREE(data_p); /* 'B' option to tdb_unpack does a malloc() */
1436
1437                 DEBUG(8,("specific: [%s], len: %d\n", valuename, size));
1438         }
1439
1440         return len;
1441 }
1442
1443 /****************************************************************************
1444  Pack all values in all printer keys
1445  ***************************************************************************/
1446
1447 static int regdb_pack_values(struct regval_ctr *values, uint8 *buf, int buflen)
1448 {
1449         int             len = 0;
1450         int             i;
1451         struct regval_blob      *val;
1452         int             num_values;
1453
1454         if ( !values )
1455                 return 0;
1456
1457         num_values = regval_ctr_numvals( values );
1458
1459         /* pack the number of values first */
1460
1461         len += tdb_pack( buf+len, buflen-len, "d", num_values );
1462
1463         /* loop over all values */
1464
1465         for ( i=0; i<num_values; i++ ) {
1466                 val = regval_ctr_specific_value( values, i );
1467                 len += tdb_pack(buf+len, buflen-len, "fdB",
1468                                 regval_name(val),
1469                                 regval_type(val),
1470                                 regval_size(val),
1471                                 regval_data_p(val) );
1472         }
1473
1474         return len;
1475 }
1476
1477 /***********************************************************************
1478  Retrieve an array of strings containing subkeys.  Memory should be
1479  released by the caller.
1480  ***********************************************************************/
1481
1482 int regdb_fetch_values(const char* key, struct regval_ctr *values)
1483 {
1484         char *keystr = NULL;
1485         TALLOC_CTX *ctx = talloc_stackframe();
1486         int ret = 0;
1487         TDB_DATA value;
1488
1489         DEBUG(10,("regdb_fetch_values: Looking for value of key [%s] \n", key));
1490
1491         if (!regdb_key_exists(key)) {
1492                 goto done;
1493         }
1494
1495         keystr = talloc_asprintf(ctx, "%s/%s", REG_VALUE_PREFIX, key);
1496         if (!keystr) {
1497                 goto done;
1498         }
1499
1500         values->seqnum = regdb_get_seqnum();
1501
1502         value = regdb_fetch_key_internal(ctx, keystr);
1503
1504         if (!value.dptr) {
1505                 /* all keys have zero values by default */
1506                 goto done;
1507         }
1508
1509         regdb_unpack_values(values, value.dptr, value.dsize);
1510         ret = regval_ctr_numvals(values);
1511
1512 done:
1513         TALLOC_FREE(ctx);
1514         return ret;
1515 }
1516
1517 bool regdb_store_values(const char *key, struct regval_ctr *values)
1518 {
1519         TDB_DATA old_data, data;
1520         char *keystr = NULL;
1521         TALLOC_CTX *ctx = talloc_stackframe();
1522         int len;
1523         NTSTATUS status;
1524         bool result = false;
1525
1526         DEBUG(10,("regdb_store_values: Looking for value of key [%s] \n", key));
1527
1528         if (!regdb_key_exists(key)) {
1529                 goto done;
1530         }
1531
1532         ZERO_STRUCT(data);
1533
1534         len = regdb_pack_values(values, data.dptr, data.dsize);
1535         if (len <= 0) {
1536                 DEBUG(0,("regdb_store_values: unable to pack values. len <= 0\n"));
1537                 goto done;
1538         }
1539
1540         data.dptr = TALLOC_ARRAY(ctx, uint8, len);
1541         data.dsize = len;
1542
1543         len = regdb_pack_values(values, data.dptr, data.dsize);
1544
1545         SMB_ASSERT( len == data.dsize );
1546
1547         keystr = talloc_asprintf(ctx, "%s/%s", REG_VALUE_PREFIX, key );
1548         if (!keystr) {
1549                 goto done;
1550         }
1551         keystr = normalize_reg_path(ctx, keystr);
1552         if (!keystr) {
1553                 goto done;
1554         }
1555
1556         old_data = dbwrap_fetch_bystring(regdb, ctx, keystr);
1557
1558         if ((old_data.dptr != NULL)
1559             && (old_data.dsize == data.dsize)
1560             && (memcmp(old_data.dptr, data.dptr, data.dsize) == 0))
1561         {
1562                 result = true;
1563                 goto done;
1564         }
1565
1566         status = dbwrap_trans_store_bystring(regdb, keystr, data, TDB_REPLACE);
1567
1568         result = NT_STATUS_IS_OK(status);
1569
1570 done:
1571         TALLOC_FREE(ctx);
1572         return result;
1573 }
1574
1575 static WERROR regdb_get_secdesc(TALLOC_CTX *mem_ctx, const char *key,
1576                                 struct security_descriptor **psecdesc)
1577 {
1578         char *tdbkey;
1579         TDB_DATA data;
1580         NTSTATUS status;
1581         TALLOC_CTX *tmp_ctx = talloc_stackframe();
1582         WERROR err = WERR_OK;
1583
1584         DEBUG(10, ("regdb_get_secdesc: Getting secdesc of key [%s]\n", key));
1585
1586         if (!regdb_key_exists(key)) {
1587                 err = WERR_BADFILE;
1588                 goto done;
1589         }
1590
1591         tdbkey = talloc_asprintf(tmp_ctx, "%s/%s", REG_SECDESC_PREFIX, key);
1592         if (tdbkey == NULL) {
1593                 err = WERR_NOMEM;
1594                 goto done;
1595         }
1596         normalize_dbkey(tdbkey);
1597
1598         data = dbwrap_fetch_bystring(regdb, tmp_ctx, tdbkey);
1599         if (data.dptr == NULL) {
1600                 err = WERR_BADFILE;
1601                 goto done;
1602         }
1603
1604         status = unmarshall_sec_desc(mem_ctx, (uint8 *)data.dptr, data.dsize,
1605                                      psecdesc);
1606
1607         if (NT_STATUS_EQUAL(status, NT_STATUS_NO_MEMORY)) {
1608                 err = WERR_NOMEM;
1609         } else if (!NT_STATUS_IS_OK(status)) {
1610                 err = WERR_REG_CORRUPT;
1611         }
1612
1613 done:
1614         TALLOC_FREE(tmp_ctx);
1615         return err;
1616 }
1617
1618 static WERROR regdb_set_secdesc(const char *key,
1619                                 struct security_descriptor *secdesc)
1620 {
1621         TALLOC_CTX *mem_ctx = talloc_stackframe();
1622         char *tdbkey;
1623         WERROR err = WERR_NOMEM;
1624         TDB_DATA tdbdata;
1625
1626         if (!regdb_key_exists(key)) {
1627                 err = WERR_BADFILE;
1628                 goto done;
1629         }
1630
1631         tdbkey = talloc_asprintf(mem_ctx, "%s/%s", REG_SECDESC_PREFIX, key);
1632         if (tdbkey == NULL) {
1633                 goto done;
1634         }
1635         normalize_dbkey(tdbkey);
1636
1637         if (secdesc == NULL) {
1638                 /* assuming a delete */
1639                 err = ntstatus_to_werror(dbwrap_trans_delete_bystring(regdb,
1640                                                                       tdbkey));
1641                 goto done;
1642         }
1643
1644         err = ntstatus_to_werror(marshall_sec_desc(mem_ctx, secdesc,
1645                                                    &tdbdata.dptr,
1646                                                    &tdbdata.dsize));
1647         W_ERROR_NOT_OK_GOTO_DONE(err);
1648
1649         err = ntstatus_to_werror(dbwrap_trans_store_bystring(regdb, tdbkey,
1650                                                              tdbdata, 0));
1651
1652  done:
1653         TALLOC_FREE(mem_ctx);
1654         return err;
1655 }
1656
1657 bool regdb_subkeys_need_update(struct regsubkey_ctr *subkeys)
1658 {
1659         return (regdb_get_seqnum() != regsubkey_ctr_get_seqnum(subkeys));
1660 }
1661
1662 bool regdb_values_need_update(struct regval_ctr *values)
1663 {
1664         return (regdb_get_seqnum() != values->seqnum);
1665 }
1666
1667 /* 
1668  * Table of function pointers for default access
1669  */
1670  
1671 struct registry_ops regdb_ops = {
1672         .fetch_subkeys = regdb_fetch_keys,
1673         .fetch_values = regdb_fetch_values,
1674         .store_subkeys = regdb_store_keys,
1675         .store_values = regdb_store_values,
1676         .create_subkey = regdb_create_subkey,
1677         .delete_subkey = regdb_delete_subkey,
1678         .get_secdesc = regdb_get_secdesc,
1679         .set_secdesc = regdb_set_secdesc,
1680         .subkeys_need_update = regdb_subkeys_need_update,
1681         .values_need_update = regdb_values_need_update
1682 };