s3:registry: in regdb_delete_subkey(), panic if transaction_cancel fails
[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(struct db_context *db, const char *key);
31 static bool regdb_key_is_base_key(const char *key);
32 static int regdb_fetch_keys_internal(struct db_context *db, const char *key,
33                                      struct regsubkey_ctr *ctr);
34 static bool regdb_store_keys_internal(struct db_context *db, const char *key,
35                                       struct regsubkey_ctr *ctr);
36
37 /* List the deepest path into the registry.  All part components will be created.*/
38
39 /* If you want to have a part of the path controlled by the tdb and part by
40    a virtual registry db (e.g. printing), then you have to list the deepest path.
41    For example,"HKLM/SOFTWARE/Microsoft/Windows NT/CurrentVersion/Print" 
42    allows the reg_db backend to handle everything up to 
43    "HKLM/SOFTWARE/Microsoft/Windows NT/CurrentVersion" and then we'll hook 
44    the reg_printing backend onto the last component of the path (see 
45    KEY_PRINTING_2K in include/rpc_reg.h)   --jerry */
46
47 static const char *builtin_registry_paths[] = {
48         KEY_PRINTING_2K,
49         KEY_PRINTING_PORTS,
50         KEY_PRINTING,
51         KEY_SHARES,
52         KEY_EVENTLOG,
53         KEY_SMBCONF,
54         KEY_PERFLIB,
55         KEY_PERFLIB_009,
56         KEY_GROUP_POLICY,
57         KEY_SAMBA_GROUP_POLICY,
58         KEY_GP_MACHINE_POLICY,
59         KEY_GP_MACHINE_WIN_POLICY,
60         KEY_HKCU,
61         KEY_GP_USER_POLICY,
62         KEY_GP_USER_WIN_POLICY,
63         KEY_WINLOGON_GPEXT_PATH,
64         "HKLM\\SYSTEM\\CurrentControlSet\\Control\\Print\\Monitors",
65         KEY_PROD_OPTIONS,
66         "HKLM\\SYSTEM\\CurrentControlSet\\Control\\Terminal Server\\DefaultUserConfiguration",
67         KEY_TCPIP_PARAMS,
68         KEY_NETLOGON_PARAMS,
69         KEY_HKU,
70         KEY_HKCR,
71         KEY_HKPD,
72         KEY_HKPT,
73          NULL };
74
75 struct builtin_regkey_value {
76         const char *path;
77         const char *valuename;
78         uint32 type;
79         union {
80                 const char *string;
81                 uint32 dw_value;
82         } data;
83 };
84
85 static struct builtin_regkey_value builtin_registry_values[] = {
86         { KEY_PRINTING_PORTS,
87                 SAMBA_PRINTER_PORT_NAME, REG_SZ, { "" } },
88         { KEY_PRINTING_2K,
89                 "DefaultSpoolDirectory", REG_SZ, { "C:\\Windows\\System32\\Spool\\Printers" } },
90         { KEY_EVENTLOG,
91                 "DisplayName", REG_SZ, { "Event Log" } }, 
92         { KEY_EVENTLOG,
93                 "ErrorControl", REG_DWORD, { (char*)0x00000001 } },
94         { NULL, NULL, 0, { NULL } }
95 };
96
97 /**
98  * Initialize a key in the registry:
99  * create each component key of the specified path.
100  */
101 static WERROR init_registry_key_internal(const char *add_path)
102 {
103         WERROR werr;
104         TALLOC_CTX *frame = talloc_stackframe();
105         char *path = NULL;
106         char *base = NULL;
107         char *remaining = NULL;
108         char *keyname;
109         char *subkeyname;
110         struct regsubkey_ctr *subkeys;
111         const char *p, *p2;
112
113         DEBUG(6, ("init_registry_key: Adding [%s]\n", add_path));
114
115         path = talloc_strdup(frame, add_path);
116         base = talloc_strdup(frame, "");
117         if (!path || !base) {
118                 werr = WERR_NOMEM;
119                 goto fail;
120         }
121         p = path;
122
123         while (next_token_talloc(frame, &p, &keyname, "\\")) {
124
125                 /* build up the registry path from the components */
126
127                 if (*base) {
128                         base = talloc_asprintf(frame, "%s\\", base);
129                         if (!base) {
130                                 werr = WERR_NOMEM;
131                                 goto fail;
132                         }
133                 }
134                 base = talloc_asprintf_append(base, "%s", keyname);
135                 if (!base) {
136                         werr = WERR_NOMEM;
137                         goto fail;
138                 }
139
140                 /* get the immediate subkeyname (if we have one ) */
141
142                 subkeyname = talloc_strdup(frame, "");
143                 if (!subkeyname) {
144                         werr = WERR_NOMEM;
145                         goto fail;
146                 }
147                 if (*p) {
148                         remaining = talloc_strdup(frame, p);
149                         if (!remaining) {
150                                 werr = WERR_NOMEM;
151                                 goto fail;
152                         }
153                         p2 = remaining;
154
155                         if (!next_token_talloc(frame, &p2,
156                                                 &subkeyname, "\\"))
157                         {
158                                 subkeyname = talloc_strdup(frame,p2);
159                                 if (!subkeyname) {
160                                         werr = WERR_NOMEM;
161                                         goto fail;
162                                 }
163                         }
164                 }
165
166                 DEBUG(10,("init_registry_key: Storing key [%s] with "
167                           "subkey [%s]\n", base,
168                           *subkeyname ? subkeyname : "NULL"));
169
170                 /* we don't really care if the lookup succeeds or not
171                  * since we are about to update the record.
172                  * We just want any subkeys already present */
173
174                 werr = regsubkey_ctr_init(frame, &subkeys);
175                 if (!W_ERROR_IS_OK(werr)) {
176                         DEBUG(0,("talloc() failure!\n"));
177                         goto fail;
178                 }
179
180                 regdb_fetch_keys_internal(regdb, base, subkeys);
181                 if (*subkeyname) {
182                         werr = regsubkey_ctr_addkey(subkeys, subkeyname);
183                         if (!W_ERROR_IS_OK(werr)) {
184                                 goto fail;
185                         }
186                 }
187                 if (!regdb_store_keys_internal(regdb, base, subkeys)) {
188                         werr = WERR_CAN_NOT_COMPLETE;
189                         goto fail;
190                 }
191         }
192
193         werr = WERR_OK;
194
195 fail:
196         TALLOC_FREE(frame);
197         return werr;
198 }
199
200 /**
201  * Initialize a key in the registry:
202  * create each component key of the specified path,
203  * wrapped in one db transaction.
204  */
205 WERROR init_registry_key(const char *add_path)
206 {
207         WERROR werr;
208
209         if (regdb_key_exists(regdb, add_path)) {
210                 return WERR_OK;
211         }
212
213         if (regdb->transaction_start(regdb) != 0) {
214                 DEBUG(0, ("init_registry_key: transaction_start failed\n"));
215                 return WERR_REG_IO_FAILURE;
216         }
217
218         werr = init_registry_key_internal(add_path);
219         if (!W_ERROR_IS_OK(werr)) {
220                 goto fail;
221         }
222
223         if (regdb->transaction_commit(regdb) != 0) {
224                 DEBUG(0, ("init_registry_key: Could not commit transaction\n"));
225                 return WERR_REG_IO_FAILURE;
226         }
227
228         return WERR_OK;
229
230 fail:
231         if (regdb->transaction_cancel(regdb) != 0) {
232                 smb_panic("init_registry_key: transaction_cancel failed\n");
233         }
234
235         return werr;
236 }
237
238 /***********************************************************************
239  Open the registry data in the tdb
240  ***********************************************************************/
241
242 WERROR init_registry_data(void)
243 {
244         WERROR werr;
245         TALLOC_CTX *frame = talloc_stackframe();
246         struct regval_ctr *values;
247         int i;
248         UNISTR2 data;
249
250         /*
251          * First, check for the existence of the needed keys and values.
252          * If all do already exist, we can save the writes.
253          */
254         for (i=0; builtin_registry_paths[i] != NULL; i++) {
255                 if (!regdb_key_exists(regdb, builtin_registry_paths[i])) {
256                         goto do_init;
257                 }
258         }
259
260         for (i=0; builtin_registry_values[i].path != NULL; i++) {
261                 values = TALLOC_ZERO_P(frame, struct regval_ctr);
262                 if (values == NULL) {
263                         werr = WERR_NOMEM;
264                         goto done;
265                 }
266
267                 regdb_fetch_values(builtin_registry_values[i].path, values);
268                 if (!regval_ctr_key_exists(values,
269                                         builtin_registry_values[i].valuename))
270                 {
271                         TALLOC_FREE(values);
272                         goto do_init;
273                 }
274
275                 TALLOC_FREE(values);
276         }
277
278         werr = WERR_OK;
279         goto done;
280
281 do_init:
282
283         /*
284          * There are potentially quite a few store operations which are all
285          * indiviually wrapped in tdb transactions. Wrapping them in a single
286          * transaction gives just a single transaction_commit() to actually do
287          * its fsync()s. See tdb/common/transaction.c for info about nested
288          * transaction behaviour.
289          */
290
291         if (regdb->transaction_start(regdb) != 0) {
292                 DEBUG(0, ("init_registry_data: tdb_transaction_start "
293                           "failed\n"));
294                 werr = WERR_REG_IO_FAILURE;
295                 goto done;
296         }
297
298         /* loop over all of the predefined paths and add each component */
299
300         for (i=0; builtin_registry_paths[i] != NULL; i++) {
301                 if (regdb_key_exists(regdb, builtin_registry_paths[i])) {
302                         continue;
303                 }
304                 werr = init_registry_key_internal(builtin_registry_paths[i]);
305                 if (!W_ERROR_IS_OK(werr)) {
306                         goto fail;
307                 }
308         }
309
310         /* loop over all of the predefined values and add each component */
311
312         for (i=0; builtin_registry_values[i].path != NULL; i++) {
313
314                 values = TALLOC_ZERO_P(frame, struct regval_ctr);
315                 if (values == NULL) {
316                         werr = WERR_NOMEM;
317                         goto fail;
318                 }
319
320                 regdb_fetch_values(builtin_registry_values[i].path, values);
321
322                 /* preserve existing values across restarts. Only add new ones */
323
324                 if (!regval_ctr_key_exists(values,
325                                         builtin_registry_values[i].valuename))
326                 {
327                         switch(builtin_registry_values[i].type) {
328                         case REG_DWORD:
329                                 regval_ctr_addvalue(values,
330                                         builtin_registry_values[i].valuename,
331                                         REG_DWORD,
332                                         (char*)&builtin_registry_values[i].data.dw_value,
333                                         sizeof(uint32));
334                                 break;
335
336                         case REG_SZ:
337                                 init_unistr2(&data,
338                                         builtin_registry_values[i].data.string,
339                                         UNI_STR_TERMINATE);
340                                 regval_ctr_addvalue(values,
341                                         builtin_registry_values[i].valuename,
342                                         REG_SZ,
343                                         (char*)data.buffer,
344                                         data.uni_str_len*sizeof(uint16));
345                                 break;
346
347                         default:
348                                 DEBUG(0, ("init_registry_data: invalid value "
349                                           "type in builtin_registry_values "
350                                           "[%d]\n",
351                                           builtin_registry_values[i].type));
352                         }
353                         regdb_store_values(builtin_registry_values[i].path,
354                                            values);
355                 }
356                 TALLOC_FREE(values);
357         }
358
359         if (regdb->transaction_commit(regdb) != 0) {
360                 DEBUG(0, ("init_registry_data: Could not commit "
361                           "transaction\n"));
362                 werr = WERR_REG_IO_FAILURE;
363         } else {
364                 werr = WERR_OK;
365         }
366
367         goto done;
368
369 fail:
370         if (regdb->transaction_cancel(regdb) != 0) {
371                 smb_panic("init_registry_data: tdb_transaction_cancel "
372                           "failed\n");
373         }
374
375 done:
376         TALLOC_FREE(frame);
377         return werr;
378 }
379
380 /***********************************************************************
381  Open the registry database
382  ***********************************************************************/
383  
384 WERROR regdb_init(void)
385 {
386         const char *vstring = "INFO/version";
387         uint32 vers_id;
388         WERROR werr;
389
390         if (regdb) {
391                 DEBUG(10, ("regdb_init: incrementing refcount (%d)\n",
392                           regdb_refcount));
393                 regdb_refcount++;
394                 return WERR_OK;
395         }
396
397         regdb = db_open(NULL, state_path("registry.tdb"), 0,
398                               REG_TDB_FLAGS, O_RDWR, 0600);
399         if (!regdb) {
400                 regdb = db_open(NULL, state_path("registry.tdb"), 0,
401                                       REG_TDB_FLAGS, O_RDWR|O_CREAT, 0600);
402                 if (!regdb) {
403                         werr = ntstatus_to_werror(map_nt_error_from_unix(errno));
404                         DEBUG(1,("regdb_init: Failed to open registry %s (%s)\n",
405                                 state_path("registry.tdb"), strerror(errno) ));
406                         return werr;
407                 }
408                 
409                 DEBUG(10,("regdb_init: Successfully created registry tdb\n"));
410         }
411
412         regdb_refcount = 1;
413
414         vers_id = dbwrap_fetch_int32(regdb, vstring);
415
416         if ( vers_id != REGVER_V1 ) {
417                 NTSTATUS status;
418                 /* any upgrade code here if needed */
419                 DEBUG(10, ("regdb_init: got %s = %d != %d\n", vstring,
420                            vers_id, REGVER_V1));
421                 status = dbwrap_trans_store_int32(regdb, vstring, REGVER_V1);
422                 if (!NT_STATUS_IS_OK(status)) {
423                         DEBUG(1, ("regdb_init: error storing %s = %d: %s\n",
424                                   vstring, REGVER_V1, nt_errstr(status)));
425                         return ntstatus_to_werror(status);
426                 } else {
427                         DEBUG(10, ("regdb_init: stored %s = %d\n",
428                                   vstring, REGVER_V1));
429                 }
430         }
431
432         return WERR_OK;
433 }
434
435 /***********************************************************************
436  Open the registry.  Must already have been initialized by regdb_init()
437  ***********************************************************************/
438
439 WERROR regdb_open( void )
440 {
441         WERROR result = WERR_OK;
442
443         if ( regdb ) {
444                 DEBUG(10,("regdb_open: incrementing refcount (%d)\n", regdb_refcount));
445                 regdb_refcount++;
446                 return WERR_OK;
447         }
448         
449         become_root();
450
451         regdb = db_open(NULL, state_path("registry.tdb"), 0,
452                               REG_TDB_FLAGS, O_RDWR, 0600);
453         if ( !regdb ) {
454                 result = ntstatus_to_werror( map_nt_error_from_unix( errno ) );
455                 DEBUG(0,("regdb_open: Failed to open %s! (%s)\n", 
456                         state_path("registry.tdb"), strerror(errno) ));
457         }
458
459         unbecome_root();
460
461         regdb_refcount = 1;
462         DEBUG(10,("regdb_open: refcount reset (%d)\n", regdb_refcount));
463
464         return result;
465 }
466
467 /***********************************************************************
468  ***********************************************************************/
469
470 int regdb_close( void )
471 {
472         if (regdb_refcount == 0) {
473                 return 0;
474         }
475
476         regdb_refcount--;
477
478         DEBUG(10,("regdb_close: decrementing refcount (%d)\n", regdb_refcount));
479
480         if ( regdb_refcount > 0 )
481                 return 0;
482
483         SMB_ASSERT( regdb_refcount >= 0 );
484
485         TALLOC_FREE(regdb);
486         return 0;
487 }
488
489 WERROR regdb_transaction_start(void)
490 {
491         return (regdb->transaction_start(regdb) == 0) ?
492                 WERR_OK : WERR_REG_IO_FAILURE;
493 }
494
495 WERROR regdb_transaction_commit(void)
496 {
497         return (regdb->transaction_commit(regdb) == 0) ?
498                 WERR_OK : WERR_REG_IO_FAILURE;
499 }
500
501 WERROR regdb_transaction_cancel(void)
502 {
503         return (regdb->transaction_cancel(regdb) == 0) ?
504                 WERR_OK : WERR_REG_IO_FAILURE;
505 }
506
507 /***********************************************************************
508  return the tdb sequence number of the registry tdb.
509  this is an indicator for the content of the registry
510  having changed. it will change upon regdb_init, too, though.
511  ***********************************************************************/
512 int regdb_get_seqnum(void)
513 {
514         return regdb->get_seqnum(regdb);
515 }
516
517
518 static WERROR regdb_delete_key_with_prefix(struct db_context *db,
519                                            const char *keyname,
520                                            const char *prefix)
521 {
522         char *path;
523         WERROR werr = WERR_NOMEM;
524         TALLOC_CTX *mem_ctx = talloc_stackframe();
525
526         if (keyname == NULL) {
527                 werr = WERR_INVALID_PARAM;
528                 goto done;
529         }
530
531         if (prefix == NULL) {
532                 path = discard_const_p(char, keyname);
533         } else {
534                 path = talloc_asprintf(mem_ctx, "%s/%s", prefix, keyname);
535                 if (path == NULL) {
536                         goto done;
537                 }
538         }
539
540         path = normalize_reg_path(mem_ctx, path);
541         if (path == NULL) {
542                 goto done;
543         }
544
545         werr = ntstatus_to_werror(dbwrap_delete_bystring(db, path));
546
547         /* treat "not" found" as ok */
548         if (W_ERROR_EQUAL(werr, WERR_NOT_FOUND)) {
549                 werr = WERR_OK;
550         }
551
552 done:
553         talloc_free(mem_ctx);
554         return werr;
555 }
556
557
558 static WERROR regdb_delete_values(struct db_context *db, const char *keyname)
559 {
560         return regdb_delete_key_with_prefix(db, keyname, REG_VALUE_PREFIX);
561 }
562
563 static WERROR regdb_delete_secdesc(struct db_context *db, const char *keyname)
564 {
565         return regdb_delete_key_with_prefix(db, keyname, REG_SECDESC_PREFIX);
566 }
567
568 static WERROR regdb_delete_subkeylist(struct db_context *db, const char *keyname)
569 {
570         return regdb_delete_key_with_prefix(db, keyname, NULL);
571 }
572
573 static WERROR regdb_delete_key_lists(struct db_context *db, const char *keyname)
574 {
575         WERROR werr;
576
577         werr = regdb_delete_values(db, keyname);
578         if (!W_ERROR_IS_OK(werr)) {
579                 DEBUG(1, (__location__ " Deleting %s/%s failed: %s\n",
580                           REG_VALUE_PREFIX, keyname, win_errstr(werr)));
581                 goto done;
582         }
583
584         werr = regdb_delete_secdesc(db, keyname);
585         if (!W_ERROR_IS_OK(werr)) {
586                 DEBUG(1, (__location__ " Deleting %s/%s failed: %s\n",
587                           REG_SECDESC_PREFIX, keyname, win_errstr(werr)));
588                 goto done;
589         }
590
591         werr = regdb_delete_subkeylist(db, keyname);
592         if (!W_ERROR_IS_OK(werr)) {
593                 DEBUG(1, (__location__ " Deleting %s failed: %s\n",
594                           keyname, win_errstr(werr)));
595                 goto done;
596         }
597
598 done:
599         return werr;
600 }
601
602 /***********************************************************************
603  Add subkey strings to the registry tdb under a defined key
604  fmt is the same format as tdb_pack except this function only supports
605  fstrings
606  ***********************************************************************/
607
608 static bool regdb_store_keys_internal2(struct db_context *db,
609                                        const char *key,
610                                        struct regsubkey_ctr *ctr)
611 {
612         TDB_DATA dbuf;
613         uint8 *buffer = NULL;
614         int i = 0;
615         uint32 len, buflen;
616         bool ret = true;
617         uint32 num_subkeys = regsubkey_ctr_numkeys(ctr);
618         char *keyname = NULL;
619         TALLOC_CTX *ctx = talloc_stackframe();
620         NTSTATUS status;
621
622         if (!key) {
623                 return false;
624         }
625
626         keyname = talloc_strdup(ctx, key);
627         if (!keyname) {
628                 return false;
629         }
630         keyname = normalize_reg_path(ctx, keyname);
631
632         /* allocate some initial memory */
633
634         buffer = (uint8 *)SMB_MALLOC(1024);
635         if (buffer == NULL) {
636                 return false;
637         }
638         buflen = 1024;
639         len = 0;
640
641         /* store the number of subkeys */
642
643         len += tdb_pack(buffer+len, buflen-len, "d", num_subkeys);
644
645         /* pack all the strings */
646
647         for (i=0; i<num_subkeys; i++) {
648                 size_t thistime;
649
650                 thistime = tdb_pack(buffer+len, buflen-len, "f",
651                                     regsubkey_ctr_specific_key(ctr, i));
652                 if (len+thistime > buflen) {
653                         size_t thistime2;
654                         /*
655                          * tdb_pack hasn't done anything because of the short
656                          * buffer, allocate extra space.
657                          */
658                         buffer = SMB_REALLOC_ARRAY(buffer, uint8_t,
659                                                    (len+thistime)*2);
660                         if(buffer == NULL) {
661                                 DEBUG(0, ("regdb_store_keys: Failed to realloc "
662                                           "memory of size [%u]\n",
663                                           (unsigned int)(len+thistime)*2));
664                                 ret = false;
665                                 goto done;
666                         }
667                         buflen = (len+thistime)*2;
668                         thistime2 = tdb_pack(
669                                 buffer+len, buflen-len, "f",
670                                 regsubkey_ctr_specific_key(ctr, i));
671                         if (thistime2 != thistime) {
672                                 DEBUG(0, ("tdb_pack failed\n"));
673                                 ret = false;
674                                 goto done;
675                         }
676                 }
677                 len += thistime;
678         }
679
680         /* finally write out the data */
681
682         dbuf.dptr = buffer;
683         dbuf.dsize = len;
684         status = dbwrap_store_bystring(db, keyname, dbuf, TDB_REPLACE);
685         if (!NT_STATUS_IS_OK(status)) {
686                 ret = false;
687                 goto done;
688         }
689
690         /*
691          * Delete a sorted subkey cache for regdb_key_exists, will be
692          * recreated automatically
693          */
694         keyname = talloc_asprintf(ctx, "%s/%s", REG_SORTED_SUBKEYS_PREFIX,
695                                   keyname);
696         if (keyname != NULL) {
697                 dbwrap_delete_bystring(db, keyname);
698         }
699
700 done:
701         TALLOC_FREE(ctx);
702         SAFE_FREE(buffer);
703         return ret;
704 }
705
706 /***********************************************************************
707  Store the new subkey record and create any child key records that
708  do not currently exist
709  ***********************************************************************/
710
711 static bool regdb_store_keys_internal(struct db_context *db, const char *key,
712                                       struct regsubkey_ctr *ctr)
713 {
714         int num_subkeys, old_num_subkeys, i;
715         char *path = NULL;
716         struct regsubkey_ctr *subkeys = NULL, *old_subkeys = NULL;
717         char *oldkeyname = NULL;
718         TALLOC_CTX *ctx = talloc_stackframe();
719         WERROR werr;
720
721         if (!regdb_key_is_base_key(key) && !regdb_key_exists(db, key)) {
722                 goto fail;
723         }
724
725         /*
726          * fetch a list of the old subkeys so we can determine if anything has
727          * changed
728          */
729
730         werr = regsubkey_ctr_init(ctx, &old_subkeys);
731         if (!W_ERROR_IS_OK(werr)) {
732                 DEBUG(0,("regdb_store_keys: talloc() failure!\n"));
733                 return false;
734         }
735
736         regdb_fetch_keys_internal(db, key, old_subkeys);
737
738         num_subkeys = regsubkey_ctr_numkeys(ctr);
739         old_num_subkeys = regsubkey_ctr_numkeys(old_subkeys);
740         if ((num_subkeys && old_num_subkeys) &&
741             (num_subkeys == old_num_subkeys)) {
742
743                 for (i = 0; i < num_subkeys; i++) {
744                         if (strcmp(regsubkey_ctr_specific_key(ctr, i),
745                                    regsubkey_ctr_specific_key(old_subkeys, i))
746                             != 0)
747                         {
748                                 break;
749                         }
750                 }
751                 if (i == num_subkeys) {
752                         /*
753                          * Nothing changed, no point to even start a tdb
754                          * transaction
755                          */
756                         TALLOC_FREE(old_subkeys);
757                         return true;
758                 }
759         }
760
761         TALLOC_FREE(old_subkeys);
762
763         if (db->transaction_start(db) != 0) {
764                 DEBUG(0, ("regdb_store_keys: transaction_start failed\n"));
765                 goto fail;
766         }
767
768         /*
769          * Re-fetch the old keys inside the transaction
770          */
771
772         werr = regsubkey_ctr_init(ctx, &old_subkeys);
773         if (!W_ERROR_IS_OK(werr)) {
774                 DEBUG(0,("regdb_store_keys: talloc() failure!\n"));
775                 goto cancel;
776         }
777
778         regdb_fetch_keys_internal(db, key, old_subkeys);
779
780         /*
781          * Make the store operation as safe as possible without transactions:
782          *
783          * (1) For each subkey removed from ctr compared with old_subkeys:
784          *
785          *     (a) First delete the value db entry.
786          *
787          *     (b) Next delete the secdesc db record.
788          *
789          *     (c) Then delete the subkey list entry.
790          *
791          * (2) Now write the list of subkeys of the parent key,
792          *     deleting removed entries and adding new ones.
793          *
794          * (3) Finally create the subkey list entries for the added keys.
795          *
796          * This way if we crash half-way in between deleting the subkeys
797          * and storing the parent's list of subkeys, no old data can pop up
798          * out of the blue when re-adding keys later on.
799          */
800
801         /* (1) delete removed keys' lists (values/secdesc/subkeys) */
802
803         num_subkeys = regsubkey_ctr_numkeys(old_subkeys);
804         for (i=0; i<num_subkeys; i++) {
805                 oldkeyname = regsubkey_ctr_specific_key(old_subkeys, i);
806
807                 if (regsubkey_ctr_key_exists(ctr, oldkeyname)) {
808                         /*
809                          * It's still around, don't delete
810                          */
811
812                         continue;
813                 }
814
815                 path = talloc_asprintf(ctx, "%s/%s", key, oldkeyname);
816                 if (!path) {
817                         goto cancel;
818                 }
819
820                 werr = regdb_delete_key_lists(db, path);
821                 W_ERROR_NOT_OK_GOTO(werr, cancel);
822
823                 TALLOC_FREE(path);
824         }
825
826         TALLOC_FREE(old_subkeys);
827
828         /* (2) store the subkey list for the parent */
829
830         if (!regdb_store_keys_internal2(db, key, ctr)) {
831                 DEBUG(0,("regdb_store_keys: Failed to store new subkey list "
832                          "for parent [%s]\n", key));
833                 goto cancel;
834         }
835
836         /* (3) now create records for any subkeys that don't already exist */
837
838         num_subkeys = regsubkey_ctr_numkeys(ctr);
839
840         if (num_subkeys == 0) {
841                 werr = regsubkey_ctr_init(ctx, &subkeys);
842                 if (!W_ERROR_IS_OK(werr)) {
843                         DEBUG(0,("regdb_store_keys: talloc() failure!\n"));
844                         goto cancel;
845                 }
846
847                 if (!regdb_store_keys_internal2(db, key, subkeys)) {
848                         DEBUG(0,("regdb_store_keys: Failed to store "
849                                  "new record for key [%s]\n", key));
850                         goto cancel;
851                 }
852                 TALLOC_FREE(subkeys);
853
854         }
855
856         for (i=0; i<num_subkeys; i++) {
857                 path = talloc_asprintf(ctx, "%s/%s",
858                                         key,
859                                         regsubkey_ctr_specific_key(ctr, i));
860                 if (!path) {
861                         goto cancel;
862                 }
863                 werr = regsubkey_ctr_init(ctx, &subkeys);
864                 if (!W_ERROR_IS_OK(werr)) {
865                         DEBUG(0,("regdb_store_keys: talloc() failure!\n"));
866                         goto cancel;
867                 }
868
869                 if (regdb_fetch_keys_internal(db, path, subkeys) == -1) {
870                         /* create a record with 0 subkeys */
871                         if (!regdb_store_keys_internal2(db, path, subkeys)) {
872                                 DEBUG(0,("regdb_store_keys: Failed to store "
873                                          "new record for key [%s]\n", path));
874                                 goto cancel;
875                         }
876                 }
877
878                 TALLOC_FREE(subkeys);
879                 TALLOC_FREE(path);
880         }
881
882         if (db->transaction_commit(db) != 0) {
883                 DEBUG(0, ("regdb_store_keys: Could not commit transaction\n"));
884                 goto fail;
885         }
886
887         TALLOC_FREE(ctx);
888         return true;
889
890 cancel:
891         if (db->transaction_cancel(db) != 0) {
892                 smb_panic("regdb_store_keys: transaction_cancel failed\n");
893         }
894
895 fail:
896         TALLOC_FREE(ctx);
897
898         return false;
899 }
900
901 bool regdb_store_keys(const char *key, struct regsubkey_ctr *ctr)
902 {
903         return regdb_store_keys_internal(regdb, key, ctr);
904 }
905
906 static WERROR regdb_create_subkey(const char *key, const char *subkey)
907 {
908         WERROR werr;
909         struct regsubkey_ctr *subkeys;
910         TALLOC_CTX *mem_ctx = talloc_stackframe();
911
912         if (!regdb_key_is_base_key(key) && !regdb_key_exists(regdb, key)) {
913                 werr = WERR_NOT_FOUND;
914                 goto done;
915         }
916
917         werr = regsubkey_ctr_init(mem_ctx, &subkeys);
918         W_ERROR_NOT_OK_GOTO_DONE(werr);
919
920         if (regdb_fetch_keys_internal(regdb, key, subkeys) < 0) {
921                 werr = WERR_REG_IO_FAILURE;
922                 goto done;
923         }
924
925         if (regsubkey_ctr_key_exists(subkeys, subkey)) {
926                 werr = WERR_OK;
927                 goto done;
928         }
929
930         talloc_free(subkeys);
931
932         if (regdb->transaction_start(regdb) != 0) {
933                 werr = WERR_REG_IO_FAILURE;
934                 goto done;
935         }
936
937         werr = regsubkey_ctr_init(mem_ctx, &subkeys);
938         W_ERROR_NOT_OK_GOTO(werr, cancel);
939
940         if (regdb_fetch_keys_internal(regdb, key, subkeys) < 0) {
941                 werr = WERR_REG_IO_FAILURE;
942                 goto cancel;
943         }
944
945         werr = regsubkey_ctr_addkey(subkeys, subkey);
946         W_ERROR_NOT_OK_GOTO(werr, cancel);
947
948         if (!regdb_store_keys_internal2(regdb, key, subkeys)) {
949                 DEBUG(0, (__location__ " failed to store new subkey list for "
950                          "parent key %s\n", key));
951                 werr = WERR_REG_IO_FAILURE;
952                 goto cancel;
953         }
954
955         if (regdb->transaction_commit(regdb) != 0) {
956                 werr = WERR_REG_IO_FAILURE;
957                 DEBUG(0, (__location__ " failed to commit transaction\n"));
958         }
959
960         goto done;
961
962 cancel:
963         if (regdb->transaction_cancel(regdb) != 0) {
964                 smb_panic("regdb_create_subkey: transaction_cancel failed\n");
965         }
966
967 done:
968         talloc_free(mem_ctx);
969         return werr;
970 }
971
972 static WERROR regdb_delete_subkey(const char *key, const char *subkey)
973 {
974         WERROR werr, werr2;
975         struct regsubkey_ctr *subkeys;
976         char *path;
977         TALLOC_CTX *mem_ctx = talloc_stackframe();
978
979         if (!regdb_key_is_base_key(key) && !regdb_key_exists(regdb, key)) {
980                 werr = WERR_NOT_FOUND;
981                 goto done;
982         }
983
984         path = talloc_asprintf(mem_ctx, "%s/%s", key, subkey);
985         if (path == NULL) {
986                 werr = WERR_NOMEM;
987                 goto done;
988         }
989
990         if (!regdb_key_exists(regdb, path)) {
991                 werr = WERR_OK;
992                 goto done;
993         }
994
995         werr = regdb_transaction_start();
996         W_ERROR_NOT_OK_GOTO_DONE(werr);
997
998         werr = regdb_delete_key_lists(regdb, path);
999         W_ERROR_NOT_OK_GOTO(werr, cancel);
1000
1001         werr = regsubkey_ctr_init(mem_ctx, &subkeys);
1002         W_ERROR_NOT_OK_GOTO(werr, cancel);
1003
1004         if (regdb_fetch_keys_internal(regdb, key, subkeys) < 0) {
1005                 werr = WERR_REG_IO_FAILURE;
1006                 goto cancel;
1007         }
1008
1009         werr = regsubkey_ctr_delkey(subkeys, subkey);
1010         W_ERROR_NOT_OK_GOTO(werr, cancel);
1011
1012         if (!regdb_store_keys_internal2(regdb, key, subkeys)) {
1013                 DEBUG(0, (__location__ " failed to store new subkey_list for "
1014                          "parent key %s\n", key));
1015                 werr = WERR_REG_IO_FAILURE;
1016                 goto cancel;
1017         }
1018
1019         werr = regdb_transaction_commit();
1020         if (!W_ERROR_IS_OK(werr)) {
1021                 DEBUG(0, (__location__ " failed to commit transaction: %s\n",
1022                          win_errstr(werr)));
1023         }
1024
1025         goto done;
1026
1027 cancel:
1028         werr2 = regdb_transaction_cancel();
1029         if (!W_ERROR_IS_OK(werr2)) {
1030                 smb_panic("regdb_delete_subkey: transaction_cancel failed\n");
1031         }
1032
1033 done:
1034         talloc_free(mem_ctx);
1035         return werr;
1036 }
1037
1038 static TDB_DATA regdb_fetch_key_internal(struct db_context *db,
1039                                          TALLOC_CTX *mem_ctx, const char *key)
1040 {
1041         char *path = NULL;
1042         TDB_DATA data;
1043
1044         path = normalize_reg_path(mem_ctx, key);
1045         if (!path) {
1046                 return make_tdb_data(NULL, 0);
1047         }
1048
1049         data = dbwrap_fetch_bystring(db, mem_ctx, path);
1050
1051         TALLOC_FREE(path);
1052         return data;
1053 }
1054
1055
1056 /**
1057  * check whether a given key name represents a base key,
1058  * i.e one without a subkey separator ('/' or '\').
1059  */
1060 static bool regdb_key_is_base_key(const char *key)
1061 {
1062         TALLOC_CTX *mem_ctx = talloc_stackframe();
1063         bool ret = false;
1064         char *path;
1065
1066         if (key == NULL) {
1067                 goto done;
1068         }
1069
1070         path = normalize_reg_path(mem_ctx, key);
1071         if (path == NULL) {
1072                 DEBUG(0, ("out of memory! (talloc failed)\n"));
1073                 goto done;
1074         }
1075
1076         if (*path == '\0') {
1077                 goto done;
1078         }
1079
1080         ret = (strrchr(path, '/') == NULL);
1081
1082 done:
1083         TALLOC_FREE(mem_ctx);
1084         return ret;
1085 }
1086
1087 /*
1088  * regdb_key_exists() is a very frequent operation. It can be quite
1089  * time-consuming to fully fetch the parent's subkey list, talloc_strdup all
1090  * subkeys and then compare the keyname linearly to all the parent's subkeys.
1091  *
1092  * The following code tries to make this operation as efficient as possible:
1093  * Per registry key we create a list of subkeys that is very efficient to
1094  * search for existence of a subkey. Its format is:
1095  *
1096  * 4 bytes num_subkeys
1097  * 4*num_subkey bytes offset into the string array
1098  * then follows a sorted list of subkeys in uppercase
1099  *
1100  * This record is created by create_sorted_subkeys() on demand if it does not
1101  * exist. scan_parent_subkeys() uses regdb->parse_record to search the sorted
1102  * list, the parsing code and the binary search can be found in
1103  * parent_subkey_scanner. The code uses parse_record() to avoid a memcpy of
1104  * the potentially large subkey record.
1105  *
1106  * The sorted subkey record is deleted in regdb_store_keys_internal2 and
1107  * recreated on demand.
1108  */
1109
1110 static int cmp_keynames(const void *p1, const void *p2)
1111 {
1112         return StrCaseCmp(*((char **)p1), *((char **)p2));
1113 }
1114
1115 static bool create_sorted_subkeys(const char *key, const char *sorted_keyname)
1116 {
1117         char **sorted_subkeys;
1118         struct regsubkey_ctr *ctr;
1119         bool result = false;
1120         NTSTATUS status;
1121         char *buf;
1122         char *p;
1123         int i, res;
1124         size_t len;
1125         int num_subkeys;
1126         WERROR werr;
1127
1128         if (regdb->transaction_start(regdb) != 0) {
1129                 DEBUG(0, ("create_sorted_subkeys: transaction_start "
1130                           "failed\n"));
1131                 return false;
1132         }
1133
1134         werr = regsubkey_ctr_init(talloc_tos(), &ctr);
1135         if (!W_ERROR_IS_OK(werr)) {
1136                 goto fail;
1137         }
1138
1139         res = regdb_fetch_keys_internal(regdb, key, ctr);
1140         if (res == -1) {
1141                 goto fail;
1142         }
1143
1144         num_subkeys = regsubkey_ctr_numkeys(ctr);
1145         sorted_subkeys = talloc_array(ctr, char *, num_subkeys);
1146         if (sorted_subkeys == NULL) {
1147                 goto fail;
1148         }
1149
1150         len = 4 + 4*num_subkeys;
1151
1152         for (i = 0; i < num_subkeys; i++) {
1153                 sorted_subkeys[i] = talloc_strdup_upper(sorted_subkeys,
1154                                         regsubkey_ctr_specific_key(ctr, i));
1155                 if (sorted_subkeys[i] == NULL) {
1156                         goto fail;
1157                 }
1158                 len += strlen(sorted_subkeys[i])+1;
1159         }
1160
1161         qsort(sorted_subkeys, num_subkeys, sizeof(char *), cmp_keynames);
1162
1163         buf = talloc_array(ctr, char, len);
1164         if (buf == NULL) {
1165                 goto fail;
1166         }
1167         p = buf + 4 + 4*num_subkeys;
1168
1169         SIVAL(buf, 0, num_subkeys);
1170
1171         for (i=0; i < num_subkeys; i++) {
1172                 ptrdiff_t offset = p - buf;
1173                 SIVAL(buf, 4 + 4*i, offset);
1174                 strlcpy(p, sorted_subkeys[i], len-offset);
1175                 p += strlen(sorted_subkeys[i]) + 1;
1176         }
1177
1178         status = dbwrap_store_bystring(
1179                 regdb, sorted_keyname, make_tdb_data((uint8_t *)buf, len),
1180                 TDB_REPLACE);
1181         if (!NT_STATUS_IS_OK(status)) {
1182                 /*
1183                  * Don't use a "goto fail;" here, this would commit the broken
1184                  * transaction. See below for an explanation.
1185                  */
1186                 if (regdb->transaction_cancel(regdb) == -1) {
1187                         DEBUG(0, ("create_sorted_subkeys: transaction_cancel "
1188                                   "failed\n"));
1189                 }
1190                 TALLOC_FREE(ctr);
1191                 return false;
1192         }
1193
1194         result = true;
1195  fail:
1196         /*
1197          * We only get here via the "goto fail" when we did not write anything
1198          * yet. Using transaction_commit even in a failure case is necessary
1199          * because this (disposable) call might be nested in other
1200          * transactions. Doing a cancel here would destroy the possibility of
1201          * a transaction_commit for transactions that we might be wrapped in.
1202          */
1203         if (regdb->transaction_commit(regdb) == -1) {
1204                 DEBUG(0, ("create_sorted_subkeys: transaction_start "
1205                           "failed\n"));
1206                 goto fail;
1207         }
1208
1209         TALLOC_FREE(ctr);
1210         return result;
1211 }
1212
1213 struct scan_subkey_state {
1214         char *name;
1215         bool scanned;
1216         bool found;
1217 };
1218
1219 static int parent_subkey_scanner(TDB_DATA key, TDB_DATA data,
1220                                  void *private_data)
1221 {
1222         struct scan_subkey_state *state =
1223                 (struct scan_subkey_state *)private_data;
1224         uint32_t num_subkeys;
1225         uint32_t l, u;
1226
1227         if (data.dsize < sizeof(uint32_t)) {
1228                 return -1;
1229         }
1230
1231         state->scanned = true;
1232         state->found = false;
1233
1234         tdb_unpack(data.dptr, data.dsize, "d", &num_subkeys);
1235
1236         l = 0;
1237         u = num_subkeys;
1238
1239         while (l < u) {
1240                 uint32_t idx = (l+u)/2;
1241                 char *s = (char *)data.dptr + IVAL(data.dptr, 4 + 4*idx);
1242                 int comparison = strcmp(state->name, s);
1243
1244                 if (comparison < 0) {
1245                         u = idx;
1246                 } else if (comparison > 0) {
1247                         l = idx + 1;
1248                 } else {
1249                         state->found = true;
1250                         return 0;
1251                 }
1252         }
1253         return 0;
1254 }
1255
1256 static bool scan_parent_subkeys(struct db_context *db, const char *parent,
1257                                 const char *name)
1258 {
1259         char *path = NULL;
1260         char *key = NULL;
1261         struct scan_subkey_state state = { 0, };
1262         bool result = false;
1263         int res;
1264
1265         state.name = NULL;
1266
1267         path = normalize_reg_path(talloc_tos(), parent);
1268         if (path == NULL) {
1269                 goto fail;
1270         }
1271
1272         key = talloc_asprintf(talloc_tos(), "%s/%s",
1273                               REG_SORTED_SUBKEYS_PREFIX, path);
1274         if (key == NULL) {
1275                 goto fail;
1276         }
1277
1278         state.name = talloc_strdup_upper(talloc_tos(), name);
1279         if (state.name == NULL) {
1280                 goto fail;
1281         }
1282         state.scanned = false;
1283
1284         res = db->parse_record(db, string_term_tdb_data(key),
1285                                parent_subkey_scanner, &state);
1286
1287         if (state.scanned) {
1288                 result = state.found;
1289         } else {
1290                 if (!create_sorted_subkeys(path, key)) {
1291                         goto fail;
1292                 }
1293                 res = db->parse_record(db, string_term_tdb_data(key),
1294                                        parent_subkey_scanner, &state);
1295                 if ((res == 0) && (state.scanned)) {
1296                         result = state.found;
1297                 }
1298         }
1299
1300  fail:
1301         TALLOC_FREE(path);
1302         TALLOC_FREE(state.name);
1303         return result;
1304 }
1305
1306 /**
1307  * Check for the existence of a key.
1308  *
1309  * Existence of a key is authoritatively defined by its
1310  * existence in the list of subkeys of its parent key.
1311  * The exeption of this are keys without a parent key,
1312  * i.e. the "base" keys (HKLM, HKCU, ...).
1313  */
1314 static bool regdb_key_exists(struct db_context *db, const char *key)
1315 {
1316         TALLOC_CTX *mem_ctx = talloc_stackframe();
1317         TDB_DATA value;
1318         bool ret = false;
1319         char *path, *p;
1320
1321         if (key == NULL) {
1322                 goto done;
1323         }
1324
1325         path = normalize_reg_path(mem_ctx, key);
1326         if (path == NULL) {
1327                 DEBUG(0, ("out of memory! (talloc failed)\n"));
1328                 goto done;
1329         }
1330
1331         if (*path == '\0') {
1332                 goto done;
1333         }
1334
1335         p = strrchr(path, '/');
1336         if (p == NULL) {
1337                 /* this is a base key */
1338                 value = regdb_fetch_key_internal(db, mem_ctx, path);
1339                 ret = (value.dptr != NULL);
1340         } else {
1341                 *p = '\0';
1342                 ret = scan_parent_subkeys(db, path, p+1);
1343         }
1344
1345 done:
1346         TALLOC_FREE(mem_ctx);
1347         return ret;
1348 }
1349
1350
1351 /***********************************************************************
1352  Retrieve an array of strings containing subkeys.  Memory should be
1353  released by the caller.
1354  ***********************************************************************/
1355
1356 static int regdb_fetch_keys_internal(struct db_context *db, const char *key,
1357                                      struct regsubkey_ctr *ctr)
1358 {
1359         WERROR werr;
1360         uint32 num_items;
1361         uint8 *buf;
1362         uint32 buflen, len;
1363         int i;
1364         fstring subkeyname;
1365         int ret = -1;
1366         TALLOC_CTX *frame = talloc_stackframe();
1367         TDB_DATA value;
1368
1369         DEBUG(11,("regdb_fetch_keys: Enter key => [%s]\n", key ? key : "NULL"));
1370
1371         if (!regdb_key_exists(db, key)) {
1372                 goto done;
1373         }
1374
1375         werr = regsubkey_ctr_set_seqnum(ctr, db->get_seqnum(db));
1376         if (!W_ERROR_IS_OK(werr)) {
1377                 goto done;
1378         }
1379
1380         value = regdb_fetch_key_internal(db, frame, key);
1381
1382         if (value.dptr == NULL) {
1383                 DEBUG(10, ("regdb_fetch_keys: no subkeys found for key [%s]\n",
1384                            key));
1385                 ret = 0;
1386                 goto done;
1387         }
1388
1389         buf = value.dptr;
1390         buflen = value.dsize;
1391         len = tdb_unpack( buf, buflen, "d", &num_items);
1392
1393         for (i=0; i<num_items; i++) {
1394                 len += tdb_unpack(buf+len, buflen-len, "f", subkeyname);
1395                 werr = regsubkey_ctr_addkey(ctr, subkeyname);
1396                 if (!W_ERROR_IS_OK(werr)) {
1397                         DEBUG(5, ("regdb_fetch_keys: regsubkey_ctr_addkey "
1398                                   "failed: %s\n", win_errstr(werr)));
1399                         goto done;
1400                 }
1401         }
1402
1403         DEBUG(11,("regdb_fetch_keys: Exit [%d] items\n", num_items));
1404
1405         ret = num_items;
1406 done:
1407         TALLOC_FREE(frame);
1408         return ret;
1409 }
1410
1411 int regdb_fetch_keys(const char *key, struct regsubkey_ctr *ctr)
1412 {
1413         return regdb_fetch_keys_internal(regdb, key, ctr);
1414 }
1415
1416 /****************************************************************************
1417  Unpack a list of registry values frem the TDB
1418  ***************************************************************************/
1419
1420 static int regdb_unpack_values(struct regval_ctr *values, uint8 *buf, int buflen)
1421 {
1422         int             len = 0;
1423         uint32          type;
1424         fstring valuename;
1425         uint32          size;
1426         uint8           *data_p;
1427         uint32          num_values = 0;
1428         int             i;
1429
1430         /* loop and unpack the rest of the registry values */
1431
1432         len += tdb_unpack(buf+len, buflen-len, "d", &num_values);
1433
1434         for ( i=0; i<num_values; i++ ) {
1435                 /* unpack the next regval */
1436
1437                 type = REG_NONE;
1438                 size = 0;
1439                 data_p = NULL;
1440                 valuename[0] = '\0';
1441                 len += tdb_unpack(buf+len, buflen-len, "fdB",
1442                                   valuename,
1443                                   &type,
1444                                   &size,
1445                                   &data_p);
1446
1447                 /* add the new value. Paranoid protective code -- make sure data_p is valid */
1448
1449                 if (*valuename && size && data_p) {
1450                         regval_ctr_addvalue(values, valuename, type,
1451                                         (const char *)data_p, size);
1452                 }
1453                 SAFE_FREE(data_p); /* 'B' option to tdb_unpack does a malloc() */
1454
1455                 DEBUG(8,("specific: [%s], len: %d\n", valuename, size));
1456         }
1457
1458         return len;
1459 }
1460
1461 /****************************************************************************
1462  Pack all values in all printer keys
1463  ***************************************************************************/
1464
1465 static int regdb_pack_values(struct regval_ctr *values, uint8 *buf, int buflen)
1466 {
1467         int             len = 0;
1468         int             i;
1469         struct regval_blob      *val;
1470         int             num_values;
1471
1472         if ( !values )
1473                 return 0;
1474
1475         num_values = regval_ctr_numvals( values );
1476
1477         /* pack the number of values first */
1478
1479         len += tdb_pack( buf+len, buflen-len, "d", num_values );
1480
1481         /* loop over all values */
1482
1483         for ( i=0; i<num_values; i++ ) {
1484                 val = regval_ctr_specific_value( values, i );
1485                 len += tdb_pack(buf+len, buflen-len, "fdB",
1486                                 regval_name(val),
1487                                 regval_type(val),
1488                                 regval_size(val),
1489                                 regval_data_p(val) );
1490         }
1491
1492         return len;
1493 }
1494
1495 /***********************************************************************
1496  Retrieve an array of strings containing subkeys.  Memory should be
1497  released by the caller.
1498  ***********************************************************************/
1499
1500 int regdb_fetch_values(const char* key, struct regval_ctr *values)
1501 {
1502         char *keystr = NULL;
1503         TALLOC_CTX *ctx = talloc_stackframe();
1504         int ret = 0;
1505         TDB_DATA value;
1506
1507         DEBUG(10,("regdb_fetch_values: Looking for value of key [%s] \n", key));
1508
1509         if (!regdb_key_exists(regdb, key)) {
1510                 goto done;
1511         }
1512
1513         keystr = talloc_asprintf(ctx, "%s/%s", REG_VALUE_PREFIX, key);
1514         if (!keystr) {
1515                 goto done;
1516         }
1517
1518         values->seqnum = regdb_get_seqnum();
1519
1520         value = regdb_fetch_key_internal(regdb, ctx, keystr);
1521
1522         if (!value.dptr) {
1523                 /* all keys have zero values by default */
1524                 goto done;
1525         }
1526
1527         regdb_unpack_values(values, value.dptr, value.dsize);
1528         ret = regval_ctr_numvals(values);
1529
1530 done:
1531         TALLOC_FREE(ctx);
1532         return ret;
1533 }
1534
1535 bool regdb_store_values(const char *key, struct regval_ctr *values)
1536 {
1537         TDB_DATA old_data, data;
1538         char *keystr = NULL;
1539         TALLOC_CTX *ctx = talloc_stackframe();
1540         int len;
1541         NTSTATUS status;
1542         bool result = false;
1543
1544         DEBUG(10,("regdb_store_values: Looking for value of key [%s] \n", key));
1545
1546         if (!regdb_key_exists(regdb, key)) {
1547                 goto done;
1548         }
1549
1550         ZERO_STRUCT(data);
1551
1552         len = regdb_pack_values(values, data.dptr, data.dsize);
1553         if (len <= 0) {
1554                 DEBUG(0,("regdb_store_values: unable to pack values. len <= 0\n"));
1555                 goto done;
1556         }
1557
1558         data.dptr = TALLOC_ARRAY(ctx, uint8, len);
1559         data.dsize = len;
1560
1561         len = regdb_pack_values(values, data.dptr, data.dsize);
1562
1563         SMB_ASSERT( len == data.dsize );
1564
1565         keystr = talloc_asprintf(ctx, "%s/%s", REG_VALUE_PREFIX, key );
1566         if (!keystr) {
1567                 goto done;
1568         }
1569         keystr = normalize_reg_path(ctx, keystr);
1570         if (!keystr) {
1571                 goto done;
1572         }
1573
1574         old_data = dbwrap_fetch_bystring(regdb, ctx, keystr);
1575
1576         if ((old_data.dptr != NULL)
1577             && (old_data.dsize == data.dsize)
1578             && (memcmp(old_data.dptr, data.dptr, data.dsize) == 0))
1579         {
1580                 result = true;
1581                 goto done;
1582         }
1583
1584         status = dbwrap_trans_store_bystring(regdb, keystr, data, TDB_REPLACE);
1585
1586         result = NT_STATUS_IS_OK(status);
1587
1588 done:
1589         TALLOC_FREE(ctx);
1590         return result;
1591 }
1592
1593 static WERROR regdb_get_secdesc(TALLOC_CTX *mem_ctx, const char *key,
1594                                 struct security_descriptor **psecdesc)
1595 {
1596         char *tdbkey;
1597         TDB_DATA data;
1598         NTSTATUS status;
1599         TALLOC_CTX *tmp_ctx = talloc_stackframe();
1600         WERROR err = WERR_OK;
1601
1602         DEBUG(10, ("regdb_get_secdesc: Getting secdesc of key [%s]\n", key));
1603
1604         if (!regdb_key_exists(regdb, key)) {
1605                 err = WERR_BADFILE;
1606                 goto done;
1607         }
1608
1609         tdbkey = talloc_asprintf(tmp_ctx, "%s/%s", REG_SECDESC_PREFIX, key);
1610         if (tdbkey == NULL) {
1611                 err = WERR_NOMEM;
1612                 goto done;
1613         }
1614         normalize_dbkey(tdbkey);
1615
1616         data = dbwrap_fetch_bystring(regdb, tmp_ctx, tdbkey);
1617         if (data.dptr == NULL) {
1618                 err = WERR_BADFILE;
1619                 goto done;
1620         }
1621
1622         status = unmarshall_sec_desc(mem_ctx, (uint8 *)data.dptr, data.dsize,
1623                                      psecdesc);
1624
1625         if (NT_STATUS_EQUAL(status, NT_STATUS_NO_MEMORY)) {
1626                 err = WERR_NOMEM;
1627         } else if (!NT_STATUS_IS_OK(status)) {
1628                 err = WERR_REG_CORRUPT;
1629         }
1630
1631 done:
1632         TALLOC_FREE(tmp_ctx);
1633         return err;
1634 }
1635
1636 static WERROR regdb_set_secdesc(const char *key,
1637                                 struct security_descriptor *secdesc)
1638 {
1639         TALLOC_CTX *mem_ctx = talloc_stackframe();
1640         char *tdbkey;
1641         WERROR err = WERR_NOMEM;
1642         TDB_DATA tdbdata;
1643
1644         if (!regdb_key_exists(regdb, key)) {
1645                 err = WERR_BADFILE;
1646                 goto done;
1647         }
1648
1649         tdbkey = talloc_asprintf(mem_ctx, "%s/%s", REG_SECDESC_PREFIX, key);
1650         if (tdbkey == NULL) {
1651                 goto done;
1652         }
1653         normalize_dbkey(tdbkey);
1654
1655         if (secdesc == NULL) {
1656                 /* assuming a delete */
1657                 err = ntstatus_to_werror(dbwrap_trans_delete_bystring(regdb,
1658                                                                       tdbkey));
1659                 goto done;
1660         }
1661
1662         err = ntstatus_to_werror(marshall_sec_desc(mem_ctx, secdesc,
1663                                                    &tdbdata.dptr,
1664                                                    &tdbdata.dsize));
1665         W_ERROR_NOT_OK_GOTO_DONE(err);
1666
1667         err = ntstatus_to_werror(dbwrap_trans_store_bystring(regdb, tdbkey,
1668                                                              tdbdata, 0));
1669
1670  done:
1671         TALLOC_FREE(mem_ctx);
1672         return err;
1673 }
1674
1675 bool regdb_subkeys_need_update(struct regsubkey_ctr *subkeys)
1676 {
1677         return (regdb_get_seqnum() != regsubkey_ctr_get_seqnum(subkeys));
1678 }
1679
1680 bool regdb_values_need_update(struct regval_ctr *values)
1681 {
1682         return (regdb_get_seqnum() != values->seqnum);
1683 }
1684
1685 /* 
1686  * Table of function pointers for default access
1687  */
1688  
1689 struct registry_ops regdb_ops = {
1690         .fetch_subkeys = regdb_fetch_keys,
1691         .fetch_values = regdb_fetch_values,
1692         .store_subkeys = regdb_store_keys,
1693         .store_values = regdb_store_values,
1694         .create_subkey = regdb_create_subkey,
1695         .delete_subkey = regdb_delete_subkey,
1696         .get_secdesc = regdb_get_secdesc,
1697         .set_secdesc = regdb_set_secdesc,
1698         .subkeys_need_update = regdb_subkeys_need_update,
1699         .values_need_update = regdb_values_need_update
1700 };