08d72c32158616a2dee6c374862d071ed0e9b608
[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 static int regdb_fetch_values_internal(struct db_context *db, const char* key,
37                                        struct regval_ctr *values);
38 static bool regdb_store_values_internal(struct db_context *db, const char *key,
39                                         struct regval_ctr *values);
40
41 /* List the deepest path into the registry.  All part components will be created.*/
42
43 /* If you want to have a part of the path controlled by the tdb and part by
44    a virtual registry db (e.g. printing), then you have to list the deepest path.
45    For example,"HKLM/SOFTWARE/Microsoft/Windows NT/CurrentVersion/Print" 
46    allows the reg_db backend to handle everything up to 
47    "HKLM/SOFTWARE/Microsoft/Windows NT/CurrentVersion" and then we'll hook 
48    the reg_printing backend onto the last component of the path (see 
49    KEY_PRINTING_2K in include/rpc_reg.h)   --jerry */
50
51 static const char *builtin_registry_paths[] = {
52         KEY_PRINTING_2K,
53         KEY_PRINTING_PORTS,
54         KEY_PRINTING,
55         KEY_SHARES,
56         KEY_EVENTLOG,
57         KEY_SMBCONF,
58         KEY_PERFLIB,
59         KEY_PERFLIB_009,
60         KEY_GROUP_POLICY,
61         KEY_SAMBA_GROUP_POLICY,
62         KEY_GP_MACHINE_POLICY,
63         KEY_GP_MACHINE_WIN_POLICY,
64         KEY_HKCU,
65         KEY_GP_USER_POLICY,
66         KEY_GP_USER_WIN_POLICY,
67         KEY_WINLOGON_GPEXT_PATH,
68         "HKLM\\SYSTEM\\CurrentControlSet\\Control\\Print\\Monitors",
69         KEY_PROD_OPTIONS,
70         "HKLM\\SYSTEM\\CurrentControlSet\\Control\\Terminal Server\\DefaultUserConfiguration",
71         KEY_TCPIP_PARAMS,
72         KEY_NETLOGON_PARAMS,
73         KEY_HKU,
74         KEY_HKCR,
75         KEY_HKPD,
76         KEY_HKPT,
77          NULL };
78
79 struct builtin_regkey_value {
80         const char *path;
81         const char *valuename;
82         uint32 type;
83         union {
84                 const char *string;
85                 uint32 dw_value;
86         } data;
87 };
88
89 static struct builtin_regkey_value builtin_registry_values[] = {
90         { KEY_PRINTING_PORTS,
91                 SAMBA_PRINTER_PORT_NAME, REG_SZ, { "" } },
92         { KEY_PRINTING_2K,
93                 "DefaultSpoolDirectory", REG_SZ, { "C:\\Windows\\System32\\Spool\\Printers" } },
94         { KEY_EVENTLOG,
95                 "DisplayName", REG_SZ, { "Event Log" } }, 
96         { KEY_EVENTLOG,
97                 "ErrorControl", REG_DWORD, { (char*)0x00000001 } },
98         { NULL, NULL, 0, { NULL } }
99 };
100
101 /**
102  * Initialize a key in the registry:
103  * create each component key of the specified path.
104  */
105 static WERROR init_registry_key_internal(struct db_context *db,
106                                          const char *add_path)
107 {
108         WERROR werr;
109         TALLOC_CTX *frame = talloc_stackframe();
110         char *path = NULL;
111         char *base = NULL;
112         char *remaining = NULL;
113         char *keyname;
114         char *subkeyname;
115         struct regsubkey_ctr *subkeys;
116         const char *p, *p2;
117
118         DEBUG(6, ("init_registry_key: Adding [%s]\n", add_path));
119
120         path = talloc_strdup(frame, add_path);
121         base = talloc_strdup(frame, "");
122         if (!path || !base) {
123                 werr = WERR_NOMEM;
124                 goto fail;
125         }
126         p = path;
127
128         while (next_token_talloc(frame, &p, &keyname, "\\")) {
129
130                 /* build up the registry path from the components */
131
132                 if (*base) {
133                         base = talloc_asprintf(frame, "%s\\", base);
134                         if (!base) {
135                                 werr = WERR_NOMEM;
136                                 goto fail;
137                         }
138                 }
139                 base = talloc_asprintf_append(base, "%s", keyname);
140                 if (!base) {
141                         werr = WERR_NOMEM;
142                         goto fail;
143                 }
144
145                 /* get the immediate subkeyname (if we have one ) */
146
147                 subkeyname = talloc_strdup(frame, "");
148                 if (!subkeyname) {
149                         werr = WERR_NOMEM;
150                         goto fail;
151                 }
152                 if (*p) {
153                         remaining = talloc_strdup(frame, p);
154                         if (!remaining) {
155                                 werr = WERR_NOMEM;
156                                 goto fail;
157                         }
158                         p2 = remaining;
159
160                         if (!next_token_talloc(frame, &p2,
161                                                 &subkeyname, "\\"))
162                         {
163                                 subkeyname = talloc_strdup(frame,p2);
164                                 if (!subkeyname) {
165                                         werr = WERR_NOMEM;
166                                         goto fail;
167                                 }
168                         }
169                 }
170
171                 DEBUG(10,("init_registry_key: Storing key [%s] with "
172                           "subkey [%s]\n", base,
173                           *subkeyname ? subkeyname : "NULL"));
174
175                 /* we don't really care if the lookup succeeds or not
176                  * since we are about to update the record.
177                  * We just want any subkeys already present */
178
179                 werr = regsubkey_ctr_init(frame, &subkeys);
180                 if (!W_ERROR_IS_OK(werr)) {
181                         DEBUG(0,("talloc() failure!\n"));
182                         goto fail;
183                 }
184
185                 regdb_fetch_keys_internal(db, base, subkeys);
186                 if (*subkeyname) {
187                         werr = regsubkey_ctr_addkey(subkeys, subkeyname);
188                         if (!W_ERROR_IS_OK(werr)) {
189                                 goto fail;
190                         }
191                 }
192                 if (!regdb_store_keys_internal(db, base, subkeys)) {
193                         werr = WERR_CAN_NOT_COMPLETE;
194                         goto fail;
195                 }
196         }
197
198         werr = WERR_OK;
199
200 fail:
201         TALLOC_FREE(frame);
202         return werr;
203 }
204
205 struct init_registry_key_context {
206         const char *add_path;
207 };
208
209 static NTSTATUS init_registry_key_action(struct db_context *db,
210                                          void *private_data)
211 {
212         struct init_registry_key_context *init_ctx =
213                 (struct init_registry_key_context *)private_data;
214
215         return werror_to_ntstatus(init_registry_key_internal(
216                                         db, init_ctx->add_path));
217 }
218
219 /**
220  * Initialize a key in the registry:
221  * create each component key of the specified path,
222  * wrapped in one db transaction.
223  */
224 WERROR init_registry_key(const char *add_path)
225 {
226         struct init_registry_key_context init_ctx;
227
228         if (regdb_key_exists(regdb, add_path)) {
229                 return WERR_OK;
230         }
231
232         init_ctx.add_path = add_path;
233
234         return ntstatus_to_werror(dbwrap_trans_do(regdb,
235                                                   init_registry_key_action,
236                                                   &init_ctx));
237 }
238
239 /***********************************************************************
240  Open the registry data in the tdb
241  ***********************************************************************/
242
243 static void regdb_ctr_add_value(struct regval_ctr *ctr,
244                                 struct builtin_regkey_value *value)
245 {
246         UNISTR2 data;
247
248         switch(value->type) {
249         case REG_DWORD:
250                 regval_ctr_addvalue(ctr, value->valuename, REG_DWORD,
251                                     (char*)&value->data.dw_value,
252                                     sizeof(uint32));
253                 break;
254
255         case REG_SZ:
256                 init_unistr2(&data, value->data.string, UNI_STR_TERMINATE);
257                 regval_ctr_addvalue(ctr, value->valuename, REG_SZ,
258                                     (char*)data.buffer,
259                                     data.uni_str_len*sizeof(uint16));
260                 break;
261
262         default:
263                 DEBUG(0, ("regdb_ctr_add_value: invalid value type in "
264                           "registry values [%d]\n", value->type));
265         }
266 }
267
268 static NTSTATUS init_registry_data_action(struct db_context *db,
269                                           void *private_data)
270 {
271         NTSTATUS status;
272         TALLOC_CTX *frame = talloc_stackframe();
273         struct regval_ctr *values;
274         int i;
275
276         /* loop over all of the predefined paths and add each component */
277
278         for (i=0; builtin_registry_paths[i] != NULL; i++) {
279                 if (regdb_key_exists(db, builtin_registry_paths[i])) {
280                         continue;
281                 }
282                 status = werror_to_ntstatus(init_registry_key_internal(db,
283                                                   builtin_registry_paths[i]));
284                 if (!NT_STATUS_IS_OK(status)) {
285                         goto done;
286                 }
287         }
288
289         /* loop over all of the predefined values and add each component */
290
291         for (i=0; builtin_registry_values[i].path != NULL; i++) {
292
293                 values = TALLOC_ZERO_P(frame, struct regval_ctr);
294                 if (values == NULL) {
295                         status = NT_STATUS_NO_MEMORY;
296                         goto done;
297                 }
298
299                 regdb_fetch_values_internal(db,
300                                             builtin_registry_values[i].path,
301                                             values);
302
303                 /* preserve existing values across restarts. Only add new ones */
304
305                 if (!regval_ctr_key_exists(values,
306                                         builtin_registry_values[i].valuename))
307                 {
308                         regdb_ctr_add_value(values,
309                                             &builtin_registry_values[i]);
310                         regdb_store_values_internal(db,
311                                         builtin_registry_values[i].path,
312                                         values);
313                 }
314                 TALLOC_FREE(values);
315         }
316
317         status = NT_STATUS_OK;
318
319 done:
320
321         TALLOC_FREE(frame);
322         return status;
323 }
324
325 WERROR init_registry_data(void)
326 {
327         WERROR werr;
328         TALLOC_CTX *frame = talloc_stackframe();
329         struct regval_ctr *values;
330         int i;
331
332         /*
333          * First, check for the existence of the needed keys and values.
334          * If all do already exist, we can save the writes.
335          */
336         for (i=0; builtin_registry_paths[i] != NULL; i++) {
337                 if (!regdb_key_exists(regdb, builtin_registry_paths[i])) {
338                         goto do_init;
339                 }
340         }
341
342         for (i=0; builtin_registry_values[i].path != NULL; i++) {
343                 values = TALLOC_ZERO_P(frame, struct regval_ctr);
344                 if (values == NULL) {
345                         werr = WERR_NOMEM;
346                         goto done;
347                 }
348
349                 regdb_fetch_values_internal(regdb,
350                                             builtin_registry_values[i].path,
351                                             values);
352                 if (!regval_ctr_key_exists(values,
353                                         builtin_registry_values[i].valuename))
354                 {
355                         TALLOC_FREE(values);
356                         goto do_init;
357                 }
358
359                 TALLOC_FREE(values);
360         }
361
362         werr = WERR_OK;
363         goto done;
364
365 do_init:
366
367         /*
368          * There are potentially quite a few store operations which are all
369          * indiviually wrapped in tdb transactions. Wrapping them in a single
370          * transaction gives just a single transaction_commit() to actually do
371          * its fsync()s. See tdb/common/transaction.c for info about nested
372          * transaction behaviour.
373          */
374
375         werr = ntstatus_to_werror(dbwrap_trans_do(regdb,
376                                                   init_registry_data_action,
377                                                   NULL));
378
379 done:
380         TALLOC_FREE(frame);
381         return werr;
382 }
383
384 /***********************************************************************
385  Open the registry database
386  ***********************************************************************/
387  
388 WERROR regdb_init(void)
389 {
390         const char *vstring = "INFO/version";
391         uint32 vers_id;
392         WERROR werr;
393
394         if (regdb) {
395                 DEBUG(10, ("regdb_init: incrementing refcount (%d)\n",
396                           regdb_refcount));
397                 regdb_refcount++;
398                 return WERR_OK;
399         }
400
401         regdb = db_open(NULL, state_path("registry.tdb"), 0,
402                               REG_TDB_FLAGS, O_RDWR, 0600);
403         if (!regdb) {
404                 regdb = db_open(NULL, state_path("registry.tdb"), 0,
405                                       REG_TDB_FLAGS, O_RDWR|O_CREAT, 0600);
406                 if (!regdb) {
407                         werr = ntstatus_to_werror(map_nt_error_from_unix(errno));
408                         DEBUG(1,("regdb_init: Failed to open registry %s (%s)\n",
409                                 state_path("registry.tdb"), strerror(errno) ));
410                         return werr;
411                 }
412                 
413                 DEBUG(10,("regdb_init: Successfully created registry tdb\n"));
414         }
415
416         regdb_refcount = 1;
417
418         vers_id = dbwrap_fetch_int32(regdb, vstring);
419
420         if ( vers_id != REGVER_V1 ) {
421                 NTSTATUS status;
422                 /* any upgrade code here if needed */
423                 DEBUG(10, ("regdb_init: got %s = %d != %d\n", vstring,
424                            vers_id, REGVER_V1));
425                 status = dbwrap_trans_store_int32(regdb, vstring, REGVER_V1);
426                 if (!NT_STATUS_IS_OK(status)) {
427                         DEBUG(1, ("regdb_init: error storing %s = %d: %s\n",
428                                   vstring, REGVER_V1, nt_errstr(status)));
429                         return ntstatus_to_werror(status);
430                 } else {
431                         DEBUG(10, ("regdb_init: stored %s = %d\n",
432                                   vstring, REGVER_V1));
433                 }
434         }
435
436         return WERR_OK;
437 }
438
439 /***********************************************************************
440  Open the registry.  Must already have been initialized by regdb_init()
441  ***********************************************************************/
442
443 WERROR regdb_open( void )
444 {
445         WERROR result = WERR_OK;
446
447         if ( regdb ) {
448                 DEBUG(10,("regdb_open: incrementing refcount (%d)\n", regdb_refcount));
449                 regdb_refcount++;
450                 return WERR_OK;
451         }
452         
453         become_root();
454
455         regdb = db_open(NULL, state_path("registry.tdb"), 0,
456                               REG_TDB_FLAGS, O_RDWR, 0600);
457         if ( !regdb ) {
458                 result = ntstatus_to_werror( map_nt_error_from_unix( errno ) );
459                 DEBUG(0,("regdb_open: Failed to open %s! (%s)\n", 
460                         state_path("registry.tdb"), strerror(errno) ));
461         }
462
463         unbecome_root();
464
465         regdb_refcount = 1;
466         DEBUG(10,("regdb_open: refcount reset (%d)\n", regdb_refcount));
467
468         return result;
469 }
470
471 /***********************************************************************
472  ***********************************************************************/
473
474 int regdb_close( void )
475 {
476         if (regdb_refcount == 0) {
477                 return 0;
478         }
479
480         regdb_refcount--;
481
482         DEBUG(10,("regdb_close: decrementing refcount (%d)\n", regdb_refcount));
483
484         if ( regdb_refcount > 0 )
485                 return 0;
486
487         SMB_ASSERT( regdb_refcount >= 0 );
488
489         TALLOC_FREE(regdb);
490         return 0;
491 }
492
493 WERROR regdb_transaction_start(void)
494 {
495         return (regdb->transaction_start(regdb) == 0) ?
496                 WERR_OK : WERR_REG_IO_FAILURE;
497 }
498
499 WERROR regdb_transaction_commit(void)
500 {
501         return (regdb->transaction_commit(regdb) == 0) ?
502                 WERR_OK : WERR_REG_IO_FAILURE;
503 }
504
505 WERROR regdb_transaction_cancel(void)
506 {
507         return (regdb->transaction_cancel(regdb) == 0) ?
508                 WERR_OK : WERR_REG_IO_FAILURE;
509 }
510
511 /***********************************************************************
512  return the tdb sequence number of the registry tdb.
513  this is an indicator for the content of the registry
514  having changed. it will change upon regdb_init, too, though.
515  ***********************************************************************/
516 int regdb_get_seqnum(void)
517 {
518         return regdb->get_seqnum(regdb);
519 }
520
521
522 static WERROR regdb_delete_key_with_prefix(struct db_context *db,
523                                            const char *keyname,
524                                            const char *prefix)
525 {
526         char *path;
527         WERROR werr = WERR_NOMEM;
528         TALLOC_CTX *mem_ctx = talloc_stackframe();
529
530         if (keyname == NULL) {
531                 werr = WERR_INVALID_PARAM;
532                 goto done;
533         }
534
535         if (prefix == NULL) {
536                 path = discard_const_p(char, keyname);
537         } else {
538                 path = talloc_asprintf(mem_ctx, "%s/%s", prefix, keyname);
539                 if (path == NULL) {
540                         goto done;
541                 }
542         }
543
544         path = normalize_reg_path(mem_ctx, path);
545         if (path == NULL) {
546                 goto done;
547         }
548
549         werr = ntstatus_to_werror(dbwrap_delete_bystring(db, path));
550
551         /* treat "not" found" as ok */
552         if (W_ERROR_EQUAL(werr, WERR_NOT_FOUND)) {
553                 werr = WERR_OK;
554         }
555
556 done:
557         talloc_free(mem_ctx);
558         return werr;
559 }
560
561
562 static WERROR regdb_delete_values(struct db_context *db, const char *keyname)
563 {
564         return regdb_delete_key_with_prefix(db, keyname, REG_VALUE_PREFIX);
565 }
566
567 static WERROR regdb_delete_secdesc(struct db_context *db, const char *keyname)
568 {
569         return regdb_delete_key_with_prefix(db, keyname, REG_SECDESC_PREFIX);
570 }
571
572 static WERROR regdb_delete_subkeylist(struct db_context *db, const char *keyname)
573 {
574         return regdb_delete_key_with_prefix(db, keyname, NULL);
575 }
576
577 static WERROR regdb_delete_key_lists(struct db_context *db, const char *keyname)
578 {
579         WERROR werr;
580
581         werr = regdb_delete_values(db, keyname);
582         if (!W_ERROR_IS_OK(werr)) {
583                 DEBUG(1, (__location__ " Deleting %s/%s failed: %s\n",
584                           REG_VALUE_PREFIX, keyname, win_errstr(werr)));
585                 goto done;
586         }
587
588         werr = regdb_delete_secdesc(db, keyname);
589         if (!W_ERROR_IS_OK(werr)) {
590                 DEBUG(1, (__location__ " Deleting %s/%s failed: %s\n",
591                           REG_SECDESC_PREFIX, keyname, win_errstr(werr)));
592                 goto done;
593         }
594
595         werr = regdb_delete_subkeylist(db, keyname);
596         if (!W_ERROR_IS_OK(werr)) {
597                 DEBUG(1, (__location__ " Deleting %s failed: %s\n",
598                           keyname, win_errstr(werr)));
599                 goto done;
600         }
601
602 done:
603         return werr;
604 }
605
606 /***********************************************************************
607  Add subkey strings to the registry tdb under a defined key
608  fmt is the same format as tdb_pack except this function only supports
609  fstrings
610  ***********************************************************************/
611
612 static WERROR regdb_store_keys_internal2(struct db_context *db,
613                                          const char *key,
614                                          struct regsubkey_ctr *ctr)
615 {
616         TDB_DATA dbuf;
617         uint8 *buffer = NULL;
618         int i = 0;
619         uint32 len, buflen;
620         uint32 num_subkeys = regsubkey_ctr_numkeys(ctr);
621         char *keyname = NULL;
622         TALLOC_CTX *ctx = talloc_stackframe();
623         WERROR werr;
624
625         if (!key) {
626                 werr = WERR_INVALID_PARAM;
627                 goto done;
628         }
629
630         keyname = talloc_strdup(ctx, key);
631         if (!keyname) {
632                 werr = WERR_NOMEM;
633                 goto done;
634         }
635
636         keyname = normalize_reg_path(ctx, keyname);
637         if (!keyname) {
638                 werr = WERR_NOMEM;
639                 goto done;
640         }
641
642         /* allocate some initial memory */
643
644         buffer = (uint8 *)SMB_MALLOC(1024);
645         if (buffer == NULL) {
646                 werr = WERR_NOMEM;
647                 goto done;
648         }
649         buflen = 1024;
650         len = 0;
651
652         /* store the number of subkeys */
653
654         len += tdb_pack(buffer+len, buflen-len, "d", num_subkeys);
655
656         /* pack all the strings */
657
658         for (i=0; i<num_subkeys; i++) {
659                 size_t thistime;
660
661                 thistime = tdb_pack(buffer+len, buflen-len, "f",
662                                     regsubkey_ctr_specific_key(ctr, i));
663                 if (len+thistime > buflen) {
664                         size_t thistime2;
665                         /*
666                          * tdb_pack hasn't done anything because of the short
667                          * buffer, allocate extra space.
668                          */
669                         buffer = SMB_REALLOC_ARRAY(buffer, uint8_t,
670                                                    (len+thistime)*2);
671                         if(buffer == NULL) {
672                                 DEBUG(0, ("regdb_store_keys: Failed to realloc "
673                                           "memory of size [%u]\n",
674                                           (unsigned int)(len+thistime)*2));
675                                 werr = WERR_NOMEM;
676                                 goto done;
677                         }
678                         buflen = (len+thistime)*2;
679                         thistime2 = tdb_pack(
680                                 buffer+len, buflen-len, "f",
681                                 regsubkey_ctr_specific_key(ctr, i));
682                         if (thistime2 != thistime) {
683                                 DEBUG(0, ("tdb_pack failed\n"));
684                                 werr = WERR_CAN_NOT_COMPLETE;
685                                 goto done;
686                         }
687                 }
688                 len += thistime;
689         }
690
691         /* finally write out the data */
692
693         dbuf.dptr = buffer;
694         dbuf.dsize = len;
695         werr = ntstatus_to_werror(dbwrap_store_bystring(db, keyname, dbuf,
696                                                         TDB_REPLACE));
697         W_ERROR_NOT_OK_GOTO_DONE(werr);
698
699         /*
700          * Delete a sorted subkey cache for regdb_key_exists, will be
701          * recreated automatically
702          */
703         keyname = talloc_asprintf(ctx, "%s/%s", REG_SORTED_SUBKEYS_PREFIX,
704                                   keyname);
705         if (keyname == NULL) {
706                 werr = WERR_NOMEM;
707                 goto done;
708         }
709
710         werr = ntstatus_to_werror(dbwrap_delete_bystring(db, keyname));
711
712         /* don't treat WERR_NOT_FOUND as an error here */
713         if (W_ERROR_EQUAL(werr, WERR_NOT_FOUND)) {
714                 werr = WERR_OK;
715         }
716
717 done:
718         TALLOC_FREE(ctx);
719         SAFE_FREE(buffer);
720         return werr;
721 }
722
723 /***********************************************************************
724  Store the new subkey record and create any child key records that
725  do not currently exist
726  ***********************************************************************/
727
728 struct regdb_store_keys_context {
729         const char *key;
730         struct regsubkey_ctr *ctr;
731 };
732
733 static NTSTATUS regdb_store_keys_action(struct db_context *db,
734                                         void *private_data)
735 {
736         struct regdb_store_keys_context *store_ctx;
737         WERROR werr;
738         int num_subkeys, i;
739         char *path = NULL;
740         struct regsubkey_ctr *subkeys = NULL, *old_subkeys = NULL;
741         char *oldkeyname = NULL;
742         TALLOC_CTX *mem_ctx = talloc_stackframe();
743
744         store_ctx = (struct regdb_store_keys_context *)private_data;
745
746         /*
747          * Re-fetch the old keys inside the transaction
748          */
749
750         werr = regsubkey_ctr_init(mem_ctx, &old_subkeys);
751         W_ERROR_NOT_OK_GOTO_DONE(werr);
752
753         regdb_fetch_keys_internal(db, store_ctx->key, old_subkeys);
754
755         /*
756          * Make the store operation as safe as possible without transactions:
757          *
758          * (1) For each subkey removed from ctr compared with old_subkeys:
759          *
760          *     (a) First delete the value db entry.
761          *
762          *     (b) Next delete the secdesc db record.
763          *
764          *     (c) Then delete the subkey list entry.
765          *
766          * (2) Now write the list of subkeys of the parent key,
767          *     deleting removed entries and adding new ones.
768          *
769          * (3) Finally create the subkey list entries for the added keys.
770          *
771          * This way if we crash half-way in between deleting the subkeys
772          * and storing the parent's list of subkeys, no old data can pop up
773          * out of the blue when re-adding keys later on.
774          */
775
776         /* (1) delete removed keys' lists (values/secdesc/subkeys) */
777
778         num_subkeys = regsubkey_ctr_numkeys(old_subkeys);
779         for (i=0; i<num_subkeys; i++) {
780                 oldkeyname = regsubkey_ctr_specific_key(old_subkeys, i);
781
782                 if (regsubkey_ctr_key_exists(store_ctx->ctr, oldkeyname)) {
783                         /*
784                          * It's still around, don't delete
785                          */
786                         continue;
787                 }
788
789                 path = talloc_asprintf(mem_ctx, "%s/%s", store_ctx->key,
790                                        oldkeyname);
791                 if (!path) {
792                         werr = WERR_NOMEM;
793                         goto done;
794                 }
795
796                 werr = regdb_delete_key_lists(db, path);
797                 W_ERROR_NOT_OK_GOTO_DONE(werr);
798
799                 TALLOC_FREE(path);
800         }
801
802         TALLOC_FREE(old_subkeys);
803
804         /* (2) store the subkey list for the parent */
805
806         werr = regdb_store_keys_internal2(db, store_ctx->key, store_ctx->ctr);
807         if (!W_ERROR_IS_OK(werr)) {
808                 DEBUG(0,("regdb_store_keys: Failed to store new subkey list "
809                          "for parent [%s]: %s\n", store_ctx->key,
810                          win_errstr(werr)));
811                 goto done;
812         }
813
814         /* (3) now create records for any subkeys that don't already exist */
815
816         num_subkeys = regsubkey_ctr_numkeys(store_ctx->ctr);
817
818         if (num_subkeys == 0) {
819                 werr = regsubkey_ctr_init(mem_ctx, &subkeys);
820                 W_ERROR_NOT_OK_GOTO_DONE(werr);
821
822                 werr = regdb_store_keys_internal2(db, store_ctx->key, subkeys);
823                 if (!W_ERROR_IS_OK(werr)) {
824                         DEBUG(0,("regdb_store_keys: Failed to store "
825                                  "new record for key [%s]: %s\n",
826                                  store_ctx->key, win_errstr(werr)));
827                         goto done;
828                 }
829                 TALLOC_FREE(subkeys);
830         }
831
832         for (i=0; i<num_subkeys; i++) {
833                 path = talloc_asprintf(mem_ctx, "%s/%s", store_ctx->key,
834                                 regsubkey_ctr_specific_key(store_ctx->ctr, i));
835                 if (!path) {
836                         werr = WERR_NOMEM;
837                         goto done;
838                 }
839                 werr = regsubkey_ctr_init(mem_ctx, &subkeys);
840                 W_ERROR_NOT_OK_GOTO_DONE(werr);
841
842                 if (regdb_fetch_keys_internal(db, path, subkeys) == -1) {
843                         /* create a record with 0 subkeys */
844                         werr = regdb_store_keys_internal2(db, path, subkeys);
845                         if (!W_ERROR_IS_OK(werr)) {
846                                 DEBUG(0,("regdb_store_keys: Failed to store "
847                                          "new record for key [%s]: %s\n", path,
848                                          win_errstr(werr)));
849                                 goto done;
850                         }
851                 }
852
853                 TALLOC_FREE(subkeys);
854                 TALLOC_FREE(path);
855         }
856
857         werr = WERR_OK;
858
859 done:
860         talloc_free(mem_ctx);
861         return werror_to_ntstatus(werr);
862 }
863
864 static bool regdb_store_keys_internal(struct db_context *db, const char *key,
865                                       struct regsubkey_ctr *ctr)
866 {
867         int num_subkeys, old_num_subkeys, i;
868         struct regsubkey_ctr *old_subkeys = NULL;
869         TALLOC_CTX *ctx = talloc_stackframe();
870         WERROR werr;
871         bool ret = false;
872         struct regdb_store_keys_context store_ctx;
873
874         if (!regdb_key_is_base_key(key) && !regdb_key_exists(db, key)) {
875                 goto done;
876         }
877
878         /*
879          * fetch a list of the old subkeys so we can determine if anything has
880          * changed
881          */
882
883         werr = regsubkey_ctr_init(ctx, &old_subkeys);
884         if (!W_ERROR_IS_OK(werr)) {
885                 DEBUG(0,("regdb_store_keys: talloc() failure!\n"));
886                 goto done;
887         }
888
889         regdb_fetch_keys_internal(db, key, old_subkeys);
890
891         num_subkeys = regsubkey_ctr_numkeys(ctr);
892         old_num_subkeys = regsubkey_ctr_numkeys(old_subkeys);
893         if ((num_subkeys && old_num_subkeys) &&
894             (num_subkeys == old_num_subkeys)) {
895
896                 for (i = 0; i < num_subkeys; i++) {
897                         if (strcmp(regsubkey_ctr_specific_key(ctr, i),
898                                    regsubkey_ctr_specific_key(old_subkeys, i))
899                             != 0)
900                         {
901                                 break;
902                         }
903                 }
904                 if (i == num_subkeys) {
905                         /*
906                          * Nothing changed, no point to even start a tdb
907                          * transaction
908                          */
909
910                         ret = true;
911                         goto done;
912                 }
913         }
914
915         TALLOC_FREE(old_subkeys);
916
917         store_ctx.key = key;
918         store_ctx.ctr = ctr;
919
920         werr = ntstatus_to_werror(dbwrap_trans_do(db,
921                                                   regdb_store_keys_action,
922                                                   &store_ctx));
923
924         ret = W_ERROR_IS_OK(werr);
925
926 done:
927         TALLOC_FREE(ctx);
928
929         return ret;
930 }
931
932 bool regdb_store_keys(const char *key, struct regsubkey_ctr *ctr)
933 {
934         return regdb_store_keys_internal(regdb, key, ctr);
935 }
936
937 struct regdb_create_subkey_context {
938         const char *key;
939         const char *subkey;
940 };
941
942 static NTSTATUS regdb_create_subkey_action(struct db_context *db,
943                                            void *private_data)
944 {
945         WERROR werr;
946         struct regdb_create_subkey_context *create_ctx;
947         struct regsubkey_ctr *subkeys;
948         TALLOC_CTX *mem_ctx = talloc_stackframe();
949
950         create_ctx = (struct regdb_create_subkey_context *)private_data;
951
952         werr = regsubkey_ctr_init(mem_ctx, &subkeys);
953         W_ERROR_NOT_OK_GOTO_DONE(werr);
954
955         if (regdb_fetch_keys_internal(db, create_ctx->key, subkeys) < 0) {
956                 werr = WERR_REG_IO_FAILURE;
957                 goto done;
958         }
959
960         werr = regsubkey_ctr_addkey(subkeys, create_ctx->subkey);
961         W_ERROR_NOT_OK_GOTO_DONE(werr);
962
963         werr = regdb_store_keys_internal2(db, create_ctx->key, subkeys);
964         if (!W_ERROR_IS_OK(werr)) {
965                 DEBUG(0, (__location__ " failed to store new subkey list for "
966                          "parent key %s: %s\n", create_ctx->key,
967                          win_errstr(werr)));
968         }
969
970 done:
971         talloc_free(mem_ctx);
972         return werror_to_ntstatus(werr);
973 }
974
975 static WERROR regdb_create_subkey(const char *key, const char *subkey)
976 {
977         WERROR werr;
978         struct regsubkey_ctr *subkeys;
979         TALLOC_CTX *mem_ctx = talloc_stackframe();
980         struct regdb_create_subkey_context create_ctx;
981
982         if (!regdb_key_is_base_key(key) && !regdb_key_exists(regdb, key)) {
983                 werr = WERR_NOT_FOUND;
984                 goto done;
985         }
986
987         werr = regsubkey_ctr_init(mem_ctx, &subkeys);
988         W_ERROR_NOT_OK_GOTO_DONE(werr);
989
990         if (regdb_fetch_keys_internal(regdb, key, subkeys) < 0) {
991                 werr = WERR_REG_IO_FAILURE;
992                 goto done;
993         }
994
995         if (regsubkey_ctr_key_exists(subkeys, subkey)) {
996                 werr = WERR_OK;
997                 goto done;
998         }
999
1000         talloc_free(subkeys);
1001
1002         create_ctx.key = key;
1003         create_ctx.subkey = subkey;
1004
1005         werr = ntstatus_to_werror(dbwrap_trans_do(regdb,
1006                                                   regdb_create_subkey_action,
1007                                                   &create_ctx));
1008
1009 done:
1010         talloc_free(mem_ctx);
1011         return werr;
1012 }
1013
1014 static WERROR regdb_delete_subkey(const char *key, const char *subkey)
1015 {
1016         WERROR werr;
1017         struct regsubkey_ctr *subkeys;
1018         char *path;
1019         TALLOC_CTX *mem_ctx = talloc_stackframe();
1020
1021         if (!regdb_key_is_base_key(key) && !regdb_key_exists(regdb, key)) {
1022                 werr = WERR_NOT_FOUND;
1023                 goto done;
1024         }
1025
1026         path = talloc_asprintf(mem_ctx, "%s/%s", key, subkey);
1027         if (path == NULL) {
1028                 werr = WERR_NOMEM;
1029                 goto done;
1030         }
1031
1032         if (!regdb_key_exists(regdb, path)) {
1033                 werr = WERR_OK;
1034                 goto done;
1035         }
1036
1037         if (regdb->transaction_start(regdb) != 0) {
1038                 werr = WERR_REG_IO_FAILURE;
1039                 goto done;
1040         }
1041
1042         werr = regdb_delete_key_lists(regdb, path);
1043         W_ERROR_NOT_OK_GOTO(werr, cancel);
1044
1045         werr = regsubkey_ctr_init(mem_ctx, &subkeys);
1046         W_ERROR_NOT_OK_GOTO(werr, cancel);
1047
1048         if (regdb_fetch_keys_internal(regdb, key, subkeys) < 0) {
1049                 werr = WERR_REG_IO_FAILURE;
1050                 goto cancel;
1051         }
1052
1053         werr = regsubkey_ctr_delkey(subkeys, subkey);
1054         W_ERROR_NOT_OK_GOTO(werr, cancel);
1055
1056         werr = regdb_store_keys_internal2(regdb, key, subkeys);
1057         if (!W_ERROR_IS_OK(werr)) {
1058                 DEBUG(0, (__location__ " failed to store new subkey_list for "
1059                          "parent key %s: %s\n", key, win_errstr(werr)));
1060                 goto cancel;
1061         }
1062
1063         if (regdb->transaction_commit(regdb) != 0) {
1064                 DEBUG(0, (__location__ " failed to commit transaction\n"));
1065                 werr = WERR_REG_IO_FAILURE;
1066         }
1067
1068         goto done;
1069
1070 cancel:
1071         if (regdb->transaction_cancel(regdb) != 0) {
1072                 smb_panic("regdb_delete_subkey: transaction_cancel failed\n");
1073         }
1074
1075 done:
1076         talloc_free(mem_ctx);
1077         return werr;
1078 }
1079
1080 static TDB_DATA regdb_fetch_key_internal(struct db_context *db,
1081                                          TALLOC_CTX *mem_ctx, const char *key)
1082 {
1083         char *path = NULL;
1084         TDB_DATA data;
1085
1086         path = normalize_reg_path(mem_ctx, key);
1087         if (!path) {
1088                 return make_tdb_data(NULL, 0);
1089         }
1090
1091         data = dbwrap_fetch_bystring(db, mem_ctx, path);
1092
1093         TALLOC_FREE(path);
1094         return data;
1095 }
1096
1097
1098 /**
1099  * check whether a given key name represents a base key,
1100  * i.e one without a subkey separator ('/' or '\').
1101  */
1102 static bool regdb_key_is_base_key(const char *key)
1103 {
1104         TALLOC_CTX *mem_ctx = talloc_stackframe();
1105         bool ret = false;
1106         char *path;
1107
1108         if (key == NULL) {
1109                 goto done;
1110         }
1111
1112         path = normalize_reg_path(mem_ctx, key);
1113         if (path == NULL) {
1114                 DEBUG(0, ("out of memory! (talloc failed)\n"));
1115                 goto done;
1116         }
1117
1118         if (*path == '\0') {
1119                 goto done;
1120         }
1121
1122         ret = (strrchr(path, '/') == NULL);
1123
1124 done:
1125         TALLOC_FREE(mem_ctx);
1126         return ret;
1127 }
1128
1129 /*
1130  * regdb_key_exists() is a very frequent operation. It can be quite
1131  * time-consuming to fully fetch the parent's subkey list, talloc_strdup all
1132  * subkeys and then compare the keyname linearly to all the parent's subkeys.
1133  *
1134  * The following code tries to make this operation as efficient as possible:
1135  * Per registry key we create a list of subkeys that is very efficient to
1136  * search for existence of a subkey. Its format is:
1137  *
1138  * 4 bytes num_subkeys
1139  * 4*num_subkey bytes offset into the string array
1140  * then follows a sorted list of subkeys in uppercase
1141  *
1142  * This record is created by create_sorted_subkeys() on demand if it does not
1143  * exist. scan_parent_subkeys() uses regdb->parse_record to search the sorted
1144  * list, the parsing code and the binary search can be found in
1145  * parent_subkey_scanner. The code uses parse_record() to avoid a memcpy of
1146  * the potentially large subkey record.
1147  *
1148  * The sorted subkey record is deleted in regdb_store_keys_internal2 and
1149  * recreated on demand.
1150  */
1151
1152 static int cmp_keynames(const void *p1, const void *p2)
1153 {
1154         return StrCaseCmp(*((char **)p1), *((char **)p2));
1155 }
1156
1157 static bool create_sorted_subkeys(const char *key, const char *sorted_keyname)
1158 {
1159         char **sorted_subkeys;
1160         struct regsubkey_ctr *ctr;
1161         bool result = false;
1162         NTSTATUS status;
1163         char *buf;
1164         char *p;
1165         int i, res;
1166         size_t len;
1167         int num_subkeys;
1168         WERROR werr;
1169
1170         if (regdb->transaction_start(regdb) != 0) {
1171                 DEBUG(0, ("create_sorted_subkeys: transaction_start "
1172                           "failed\n"));
1173                 return false;
1174         }
1175
1176         werr = regsubkey_ctr_init(talloc_tos(), &ctr);
1177         if (!W_ERROR_IS_OK(werr)) {
1178                 goto fail;
1179         }
1180
1181         res = regdb_fetch_keys_internal(regdb, key, ctr);
1182         if (res == -1) {
1183                 goto fail;
1184         }
1185
1186         num_subkeys = regsubkey_ctr_numkeys(ctr);
1187         sorted_subkeys = talloc_array(ctr, char *, num_subkeys);
1188         if (sorted_subkeys == NULL) {
1189                 goto fail;
1190         }
1191
1192         len = 4 + 4*num_subkeys;
1193
1194         for (i = 0; i < num_subkeys; i++) {
1195                 sorted_subkeys[i] = talloc_strdup_upper(sorted_subkeys,
1196                                         regsubkey_ctr_specific_key(ctr, i));
1197                 if (sorted_subkeys[i] == NULL) {
1198                         goto fail;
1199                 }
1200                 len += strlen(sorted_subkeys[i])+1;
1201         }
1202
1203         qsort(sorted_subkeys, num_subkeys, sizeof(char *), cmp_keynames);
1204
1205         buf = talloc_array(ctr, char, len);
1206         if (buf == NULL) {
1207                 goto fail;
1208         }
1209         p = buf + 4 + 4*num_subkeys;
1210
1211         SIVAL(buf, 0, num_subkeys);
1212
1213         for (i=0; i < num_subkeys; i++) {
1214                 ptrdiff_t offset = p - buf;
1215                 SIVAL(buf, 4 + 4*i, offset);
1216                 strlcpy(p, sorted_subkeys[i], len-offset);
1217                 p += strlen(sorted_subkeys[i]) + 1;
1218         }
1219
1220         status = dbwrap_store_bystring(
1221                 regdb, sorted_keyname, make_tdb_data((uint8_t *)buf, len),
1222                 TDB_REPLACE);
1223         if (!NT_STATUS_IS_OK(status)) {
1224                 /*
1225                  * Don't use a "goto fail;" here, this would commit the broken
1226                  * transaction. See below for an explanation.
1227                  */
1228                 if (regdb->transaction_cancel(regdb) == -1) {
1229                         smb_panic("create_sorted_subkeys: transaction_cancel "
1230                                   "failed\n");
1231                 }
1232                 TALLOC_FREE(ctr);
1233                 return false;
1234         }
1235
1236         result = true;
1237  fail:
1238         /*
1239          * We only get here via the "goto fail" when we did not write anything
1240          * yet. Using transaction_commit even in a failure case is necessary
1241          * because this (disposable) call might be nested in other
1242          * transactions. Doing a cancel here would destroy the possibility of
1243          * a transaction_commit for transactions that we might be wrapped in.
1244          */
1245         if (regdb->transaction_commit(regdb) == -1) {
1246                 DEBUG(0, ("create_sorted_subkeys: transaction_commit "
1247                           "failed\n"));
1248                 result = false;
1249         }
1250
1251         TALLOC_FREE(ctr);
1252         return result;
1253 }
1254
1255 struct scan_subkey_state {
1256         char *name;
1257         bool scanned;
1258         bool found;
1259 };
1260
1261 static int parent_subkey_scanner(TDB_DATA key, TDB_DATA data,
1262                                  void *private_data)
1263 {
1264         struct scan_subkey_state *state =
1265                 (struct scan_subkey_state *)private_data;
1266         uint32_t num_subkeys;
1267         uint32_t l, u;
1268
1269         if (data.dsize < sizeof(uint32_t)) {
1270                 return -1;
1271         }
1272
1273         state->scanned = true;
1274         state->found = false;
1275
1276         tdb_unpack(data.dptr, data.dsize, "d", &num_subkeys);
1277
1278         l = 0;
1279         u = num_subkeys;
1280
1281         while (l < u) {
1282                 uint32_t idx = (l+u)/2;
1283                 char *s = (char *)data.dptr + IVAL(data.dptr, 4 + 4*idx);
1284                 int comparison = strcmp(state->name, s);
1285
1286                 if (comparison < 0) {
1287                         u = idx;
1288                 } else if (comparison > 0) {
1289                         l = idx + 1;
1290                 } else {
1291                         state->found = true;
1292                         return 0;
1293                 }
1294         }
1295         return 0;
1296 }
1297
1298 static bool scan_parent_subkeys(struct db_context *db, const char *parent,
1299                                 const char *name)
1300 {
1301         char *path = NULL;
1302         char *key = NULL;
1303         struct scan_subkey_state state = { 0, };
1304         bool result = false;
1305         int res;
1306
1307         state.name = NULL;
1308
1309         path = normalize_reg_path(talloc_tos(), parent);
1310         if (path == NULL) {
1311                 goto fail;
1312         }
1313
1314         key = talloc_asprintf(talloc_tos(), "%s/%s",
1315                               REG_SORTED_SUBKEYS_PREFIX, path);
1316         if (key == NULL) {
1317                 goto fail;
1318         }
1319
1320         state.name = talloc_strdup_upper(talloc_tos(), name);
1321         if (state.name == NULL) {
1322                 goto fail;
1323         }
1324         state.scanned = false;
1325
1326         res = db->parse_record(db, string_term_tdb_data(key),
1327                                parent_subkey_scanner, &state);
1328
1329         if (state.scanned) {
1330                 result = state.found;
1331         } else {
1332                 if (!create_sorted_subkeys(path, key)) {
1333                         goto fail;
1334                 }
1335                 res = db->parse_record(db, string_term_tdb_data(key),
1336                                        parent_subkey_scanner, &state);
1337                 if ((res == 0) && (state.scanned)) {
1338                         result = state.found;
1339                 }
1340         }
1341
1342  fail:
1343         TALLOC_FREE(path);
1344         TALLOC_FREE(state.name);
1345         return result;
1346 }
1347
1348 /**
1349  * Check for the existence of a key.
1350  *
1351  * Existence of a key is authoritatively defined by its
1352  * existence in the list of subkeys of its parent key.
1353  * The exeption of this are keys without a parent key,
1354  * i.e. the "base" keys (HKLM, HKCU, ...).
1355  */
1356 static bool regdb_key_exists(struct db_context *db, const char *key)
1357 {
1358         TALLOC_CTX *mem_ctx = talloc_stackframe();
1359         TDB_DATA value;
1360         bool ret = false;
1361         char *path, *p;
1362
1363         if (key == NULL) {
1364                 goto done;
1365         }
1366
1367         path = normalize_reg_path(mem_ctx, key);
1368         if (path == NULL) {
1369                 DEBUG(0, ("out of memory! (talloc failed)\n"));
1370                 goto done;
1371         }
1372
1373         if (*path == '\0') {
1374                 goto done;
1375         }
1376
1377         p = strrchr(path, '/');
1378         if (p == NULL) {
1379                 /* this is a base key */
1380                 value = regdb_fetch_key_internal(db, mem_ctx, path);
1381                 ret = (value.dptr != NULL);
1382         } else {
1383                 *p = '\0';
1384                 ret = scan_parent_subkeys(db, path, p+1);
1385         }
1386
1387 done:
1388         TALLOC_FREE(mem_ctx);
1389         return ret;
1390 }
1391
1392
1393 /***********************************************************************
1394  Retrieve an array of strings containing subkeys.  Memory should be
1395  released by the caller.
1396  ***********************************************************************/
1397
1398 static int regdb_fetch_keys_internal(struct db_context *db, const char *key,
1399                                      struct regsubkey_ctr *ctr)
1400 {
1401         WERROR werr;
1402         uint32 num_items;
1403         uint8 *buf;
1404         uint32 buflen, len;
1405         int i;
1406         fstring subkeyname;
1407         int ret = -1;
1408         TALLOC_CTX *frame = talloc_stackframe();
1409         TDB_DATA value;
1410
1411         DEBUG(11,("regdb_fetch_keys: Enter key => [%s]\n", key ? key : "NULL"));
1412
1413         if (!regdb_key_exists(db, key)) {
1414                 goto done;
1415         }
1416
1417         werr = regsubkey_ctr_set_seqnum(ctr, db->get_seqnum(db));
1418         if (!W_ERROR_IS_OK(werr)) {
1419                 goto done;
1420         }
1421
1422         value = regdb_fetch_key_internal(db, frame, key);
1423
1424         if (value.dptr == NULL) {
1425                 DEBUG(10, ("regdb_fetch_keys: no subkeys found for key [%s]\n",
1426                            key));
1427                 ret = 0;
1428                 goto done;
1429         }
1430
1431         buf = value.dptr;
1432         buflen = value.dsize;
1433         len = tdb_unpack( buf, buflen, "d", &num_items);
1434
1435         for (i=0; i<num_items; i++) {
1436                 len += tdb_unpack(buf+len, buflen-len, "f", subkeyname);
1437                 werr = regsubkey_ctr_addkey(ctr, subkeyname);
1438                 if (!W_ERROR_IS_OK(werr)) {
1439                         DEBUG(5, ("regdb_fetch_keys: regsubkey_ctr_addkey "
1440                                   "failed: %s\n", win_errstr(werr)));
1441                         goto done;
1442                 }
1443         }
1444
1445         DEBUG(11,("regdb_fetch_keys: Exit [%d] items\n", num_items));
1446
1447         ret = num_items;
1448 done:
1449         TALLOC_FREE(frame);
1450         return ret;
1451 }
1452
1453 int regdb_fetch_keys(const char *key, struct regsubkey_ctr *ctr)
1454 {
1455         return regdb_fetch_keys_internal(regdb, key, ctr);
1456 }
1457
1458 /****************************************************************************
1459  Unpack a list of registry values frem the TDB
1460  ***************************************************************************/
1461
1462 static int regdb_unpack_values(struct regval_ctr *values, uint8 *buf, int buflen)
1463 {
1464         int             len = 0;
1465         uint32          type;
1466         fstring valuename;
1467         uint32          size;
1468         uint8           *data_p;
1469         uint32          num_values = 0;
1470         int             i;
1471
1472         /* loop and unpack the rest of the registry values */
1473
1474         len += tdb_unpack(buf+len, buflen-len, "d", &num_values);
1475
1476         for ( i=0; i<num_values; i++ ) {
1477                 /* unpack the next regval */
1478
1479                 type = REG_NONE;
1480                 size = 0;
1481                 data_p = NULL;
1482                 valuename[0] = '\0';
1483                 len += tdb_unpack(buf+len, buflen-len, "fdB",
1484                                   valuename,
1485                                   &type,
1486                                   &size,
1487                                   &data_p);
1488
1489                 /* add the new value. Paranoid protective code -- make sure data_p is valid */
1490
1491                 if (*valuename && size && data_p) {
1492                         regval_ctr_addvalue(values, valuename, type,
1493                                         (const char *)data_p, size);
1494                 }
1495                 SAFE_FREE(data_p); /* 'B' option to tdb_unpack does a malloc() */
1496
1497                 DEBUG(8,("specific: [%s], len: %d\n", valuename, size));
1498         }
1499
1500         return len;
1501 }
1502
1503 /****************************************************************************
1504  Pack all values in all printer keys
1505  ***************************************************************************/
1506
1507 static int regdb_pack_values(struct regval_ctr *values, uint8 *buf, int buflen)
1508 {
1509         int             len = 0;
1510         int             i;
1511         struct regval_blob      *val;
1512         int             num_values;
1513
1514         if ( !values )
1515                 return 0;
1516
1517         num_values = regval_ctr_numvals( values );
1518
1519         /* pack the number of values first */
1520
1521         len += tdb_pack( buf+len, buflen-len, "d", num_values );
1522
1523         /* loop over all values */
1524
1525         for ( i=0; i<num_values; i++ ) {
1526                 val = regval_ctr_specific_value( values, i );
1527                 len += tdb_pack(buf+len, buflen-len, "fdB",
1528                                 regval_name(val),
1529                                 regval_type(val),
1530                                 regval_size(val),
1531                                 regval_data_p(val) );
1532         }
1533
1534         return len;
1535 }
1536
1537 /***********************************************************************
1538  Retrieve an array of strings containing subkeys.  Memory should be
1539  released by the caller.
1540  ***********************************************************************/
1541
1542 static int regdb_fetch_values_internal(struct db_context *db, const char* key,
1543                                        struct regval_ctr *values)
1544 {
1545         char *keystr = NULL;
1546         TALLOC_CTX *ctx = talloc_stackframe();
1547         int ret = 0;
1548         TDB_DATA value;
1549
1550         DEBUG(10,("regdb_fetch_values: Looking for value of key [%s] \n", key));
1551
1552         if (!regdb_key_exists(db, key)) {
1553                 goto done;
1554         }
1555
1556         keystr = talloc_asprintf(ctx, "%s/%s", REG_VALUE_PREFIX, key);
1557         if (!keystr) {
1558                 goto done;
1559         }
1560
1561         values->seqnum = db->get_seqnum(db);
1562
1563         value = regdb_fetch_key_internal(db, ctx, keystr);
1564
1565         if (!value.dptr) {
1566                 /* all keys have zero values by default */
1567                 goto done;
1568         }
1569
1570         regdb_unpack_values(values, value.dptr, value.dsize);
1571         ret = regval_ctr_numvals(values);
1572
1573 done:
1574         TALLOC_FREE(ctx);
1575         return ret;
1576 }
1577
1578 int regdb_fetch_values(const char* key, struct regval_ctr *values)
1579 {
1580         return regdb_fetch_values_internal(regdb, key, values);
1581 }
1582
1583 static bool regdb_store_values_internal(struct db_context *db, const char *key,
1584                                         struct regval_ctr *values)
1585 {
1586         TDB_DATA old_data, data;
1587         char *keystr = NULL;
1588         TALLOC_CTX *ctx = talloc_stackframe();
1589         int len;
1590         NTSTATUS status;
1591         bool result = false;
1592
1593         DEBUG(10,("regdb_store_values: Looking for value of key [%s] \n", key));
1594
1595         if (!regdb_key_exists(db, key)) {
1596                 goto done;
1597         }
1598
1599         ZERO_STRUCT(data);
1600
1601         len = regdb_pack_values(values, data.dptr, data.dsize);
1602         if (len <= 0) {
1603                 DEBUG(0,("regdb_store_values: unable to pack values. len <= 0\n"));
1604                 goto done;
1605         }
1606
1607         data.dptr = TALLOC_ARRAY(ctx, uint8, len);
1608         data.dsize = len;
1609
1610         len = regdb_pack_values(values, data.dptr, data.dsize);
1611
1612         SMB_ASSERT( len == data.dsize );
1613
1614         keystr = talloc_asprintf(ctx, "%s/%s", REG_VALUE_PREFIX, key );
1615         if (!keystr) {
1616                 goto done;
1617         }
1618         keystr = normalize_reg_path(ctx, keystr);
1619         if (!keystr) {
1620                 goto done;
1621         }
1622
1623         old_data = dbwrap_fetch_bystring(db, ctx, keystr);
1624
1625         if ((old_data.dptr != NULL)
1626             && (old_data.dsize == data.dsize)
1627             && (memcmp(old_data.dptr, data.dptr, data.dsize) == 0))
1628         {
1629                 result = true;
1630                 goto done;
1631         }
1632
1633         status = dbwrap_trans_store_bystring(db, keystr, data, TDB_REPLACE);
1634
1635         result = NT_STATUS_IS_OK(status);
1636
1637 done:
1638         TALLOC_FREE(ctx);
1639         return result;
1640 }
1641
1642 bool regdb_store_values(const char *key, struct regval_ctr *values)
1643 {
1644         return regdb_store_values_internal(regdb, key, values);
1645 }
1646
1647 static WERROR regdb_get_secdesc(TALLOC_CTX *mem_ctx, const char *key,
1648                                 struct security_descriptor **psecdesc)
1649 {
1650         char *tdbkey;
1651         TDB_DATA data;
1652         NTSTATUS status;
1653         TALLOC_CTX *tmp_ctx = talloc_stackframe();
1654         WERROR err = WERR_OK;
1655
1656         DEBUG(10, ("regdb_get_secdesc: Getting secdesc of key [%s]\n", key));
1657
1658         if (!regdb_key_exists(regdb, key)) {
1659                 err = WERR_BADFILE;
1660                 goto done;
1661         }
1662
1663         tdbkey = talloc_asprintf(tmp_ctx, "%s/%s", REG_SECDESC_PREFIX, key);
1664         if (tdbkey == NULL) {
1665                 err = WERR_NOMEM;
1666                 goto done;
1667         }
1668         normalize_dbkey(tdbkey);
1669
1670         data = dbwrap_fetch_bystring(regdb, tmp_ctx, tdbkey);
1671         if (data.dptr == NULL) {
1672                 err = WERR_BADFILE;
1673                 goto done;
1674         }
1675
1676         status = unmarshall_sec_desc(mem_ctx, (uint8 *)data.dptr, data.dsize,
1677                                      psecdesc);
1678
1679         if (NT_STATUS_EQUAL(status, NT_STATUS_NO_MEMORY)) {
1680                 err = WERR_NOMEM;
1681         } else if (!NT_STATUS_IS_OK(status)) {
1682                 err = WERR_REG_CORRUPT;
1683         }
1684
1685 done:
1686         TALLOC_FREE(tmp_ctx);
1687         return err;
1688 }
1689
1690 static WERROR regdb_set_secdesc(const char *key,
1691                                 struct security_descriptor *secdesc)
1692 {
1693         TALLOC_CTX *mem_ctx = talloc_stackframe();
1694         char *tdbkey;
1695         WERROR err = WERR_NOMEM;
1696         TDB_DATA tdbdata;
1697
1698         if (!regdb_key_exists(regdb, key)) {
1699                 err = WERR_BADFILE;
1700                 goto done;
1701         }
1702
1703         tdbkey = talloc_asprintf(mem_ctx, "%s/%s", REG_SECDESC_PREFIX, key);
1704         if (tdbkey == NULL) {
1705                 goto done;
1706         }
1707         normalize_dbkey(tdbkey);
1708
1709         if (secdesc == NULL) {
1710                 /* assuming a delete */
1711                 err = ntstatus_to_werror(dbwrap_trans_delete_bystring(regdb,
1712                                                                       tdbkey));
1713                 goto done;
1714         }
1715
1716         err = ntstatus_to_werror(marshall_sec_desc(mem_ctx, secdesc,
1717                                                    &tdbdata.dptr,
1718                                                    &tdbdata.dsize));
1719         W_ERROR_NOT_OK_GOTO_DONE(err);
1720
1721         err = ntstatus_to_werror(dbwrap_trans_store_bystring(regdb, tdbkey,
1722                                                              tdbdata, 0));
1723
1724  done:
1725         TALLOC_FREE(mem_ctx);
1726         return err;
1727 }
1728
1729 bool regdb_subkeys_need_update(struct regsubkey_ctr *subkeys)
1730 {
1731         return (regdb_get_seqnum() != regsubkey_ctr_get_seqnum(subkeys));
1732 }
1733
1734 bool regdb_values_need_update(struct regval_ctr *values)
1735 {
1736         return (regdb_get_seqnum() != values->seqnum);
1737 }
1738
1739 /* 
1740  * Table of function pointers for default access
1741  */
1742  
1743 struct registry_ops regdb_ops = {
1744         .fetch_subkeys = regdb_fetch_keys,
1745         .fetch_values = regdb_fetch_values,
1746         .store_subkeys = regdb_store_keys,
1747         .store_values = regdb_store_values,
1748         .create_subkey = regdb_create_subkey,
1749         .delete_subkey = regdb_delete_subkey,
1750         .get_secdesc = regdb_get_secdesc,
1751         .set_secdesc = regdb_set_secdesc,
1752         .subkeys_need_update = regdb_subkeys_need_update,
1753         .values_need_update = regdb_values_need_update
1754 };