s3:registry: add a comment header for the delete_subkey set of commands.
[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 /**
938  * create a subkey of a given key
939  */
940
941 struct regdb_create_subkey_context {
942         const char *key;
943         const char *subkey;
944 };
945
946 static NTSTATUS regdb_create_subkey_action(struct db_context *db,
947                                            void *private_data)
948 {
949         WERROR werr;
950         struct regdb_create_subkey_context *create_ctx;
951         struct regsubkey_ctr *subkeys;
952         TALLOC_CTX *mem_ctx = talloc_stackframe();
953
954         create_ctx = (struct regdb_create_subkey_context *)private_data;
955
956         werr = regsubkey_ctr_init(mem_ctx, &subkeys);
957         W_ERROR_NOT_OK_GOTO_DONE(werr);
958
959         if (regdb_fetch_keys_internal(db, create_ctx->key, subkeys) < 0) {
960                 werr = WERR_REG_IO_FAILURE;
961                 goto done;
962         }
963
964         werr = regsubkey_ctr_addkey(subkeys, create_ctx->subkey);
965         W_ERROR_NOT_OK_GOTO_DONE(werr);
966
967         werr = regdb_store_keys_internal2(db, create_ctx->key, subkeys);
968         if (!W_ERROR_IS_OK(werr)) {
969                 DEBUG(0, (__location__ " failed to store new subkey list for "
970                          "parent key %s: %s\n", create_ctx->key,
971                          win_errstr(werr)));
972         }
973
974 done:
975         talloc_free(mem_ctx);
976         return werror_to_ntstatus(werr);
977 }
978
979 static WERROR regdb_create_subkey(const char *key, const char *subkey)
980 {
981         WERROR werr;
982         struct regsubkey_ctr *subkeys;
983         TALLOC_CTX *mem_ctx = talloc_stackframe();
984         struct regdb_create_subkey_context create_ctx;
985
986         if (!regdb_key_is_base_key(key) && !regdb_key_exists(regdb, key)) {
987                 werr = WERR_NOT_FOUND;
988                 goto done;
989         }
990
991         werr = regsubkey_ctr_init(mem_ctx, &subkeys);
992         W_ERROR_NOT_OK_GOTO_DONE(werr);
993
994         if (regdb_fetch_keys_internal(regdb, key, subkeys) < 0) {
995                 werr = WERR_REG_IO_FAILURE;
996                 goto done;
997         }
998
999         if (regsubkey_ctr_key_exists(subkeys, subkey)) {
1000                 werr = WERR_OK;
1001                 goto done;
1002         }
1003
1004         talloc_free(subkeys);
1005
1006         create_ctx.key = key;
1007         create_ctx.subkey = subkey;
1008
1009         werr = ntstatus_to_werror(dbwrap_trans_do(regdb,
1010                                                   regdb_create_subkey_action,
1011                                                   &create_ctx));
1012
1013 done:
1014         talloc_free(mem_ctx);
1015         return werr;
1016 }
1017
1018 /**
1019  * create a subkey of a given key
1020  */
1021
1022 static WERROR regdb_delete_subkey(const char *key, const char *subkey)
1023 {
1024         WERROR werr;
1025         struct regsubkey_ctr *subkeys;
1026         char *path;
1027         TALLOC_CTX *mem_ctx = talloc_stackframe();
1028
1029         if (!regdb_key_is_base_key(key) && !regdb_key_exists(regdb, key)) {
1030                 werr = WERR_NOT_FOUND;
1031                 goto done;
1032         }
1033
1034         path = talloc_asprintf(mem_ctx, "%s/%s", key, subkey);
1035         if (path == NULL) {
1036                 werr = WERR_NOMEM;
1037                 goto done;
1038         }
1039
1040         if (!regdb_key_exists(regdb, path)) {
1041                 werr = WERR_OK;
1042                 goto done;
1043         }
1044
1045         if (regdb->transaction_start(regdb) != 0) {
1046                 werr = WERR_REG_IO_FAILURE;
1047                 goto done;
1048         }
1049
1050         werr = regdb_delete_key_lists(regdb, path);
1051         W_ERROR_NOT_OK_GOTO(werr, cancel);
1052
1053         werr = regsubkey_ctr_init(mem_ctx, &subkeys);
1054         W_ERROR_NOT_OK_GOTO(werr, cancel);
1055
1056         if (regdb_fetch_keys_internal(regdb, key, subkeys) < 0) {
1057                 werr = WERR_REG_IO_FAILURE;
1058                 goto cancel;
1059         }
1060
1061         werr = regsubkey_ctr_delkey(subkeys, subkey);
1062         W_ERROR_NOT_OK_GOTO(werr, cancel);
1063
1064         werr = regdb_store_keys_internal2(regdb, key, subkeys);
1065         if (!W_ERROR_IS_OK(werr)) {
1066                 DEBUG(0, (__location__ " failed to store new subkey_list for "
1067                          "parent key %s: %s\n", key, win_errstr(werr)));
1068                 goto cancel;
1069         }
1070
1071         if (regdb->transaction_commit(regdb) != 0) {
1072                 DEBUG(0, (__location__ " failed to commit transaction\n"));
1073                 werr = WERR_REG_IO_FAILURE;
1074         }
1075
1076         goto done;
1077
1078 cancel:
1079         if (regdb->transaction_cancel(regdb) != 0) {
1080                 smb_panic("regdb_delete_subkey: transaction_cancel failed\n");
1081         }
1082
1083 done:
1084         talloc_free(mem_ctx);
1085         return werr;
1086 }
1087
1088 static TDB_DATA regdb_fetch_key_internal(struct db_context *db,
1089                                          TALLOC_CTX *mem_ctx, const char *key)
1090 {
1091         char *path = NULL;
1092         TDB_DATA data;
1093
1094         path = normalize_reg_path(mem_ctx, key);
1095         if (!path) {
1096                 return make_tdb_data(NULL, 0);
1097         }
1098
1099         data = dbwrap_fetch_bystring(db, mem_ctx, path);
1100
1101         TALLOC_FREE(path);
1102         return data;
1103 }
1104
1105
1106 /**
1107  * check whether a given key name represents a base key,
1108  * i.e one without a subkey separator ('/' or '\').
1109  */
1110 static bool regdb_key_is_base_key(const char *key)
1111 {
1112         TALLOC_CTX *mem_ctx = talloc_stackframe();
1113         bool ret = false;
1114         char *path;
1115
1116         if (key == NULL) {
1117                 goto done;
1118         }
1119
1120         path = normalize_reg_path(mem_ctx, key);
1121         if (path == NULL) {
1122                 DEBUG(0, ("out of memory! (talloc failed)\n"));
1123                 goto done;
1124         }
1125
1126         if (*path == '\0') {
1127                 goto done;
1128         }
1129
1130         ret = (strrchr(path, '/') == NULL);
1131
1132 done:
1133         TALLOC_FREE(mem_ctx);
1134         return ret;
1135 }
1136
1137 /*
1138  * regdb_key_exists() is a very frequent operation. It can be quite
1139  * time-consuming to fully fetch the parent's subkey list, talloc_strdup all
1140  * subkeys and then compare the keyname linearly to all the parent's subkeys.
1141  *
1142  * The following code tries to make this operation as efficient as possible:
1143  * Per registry key we create a list of subkeys that is very efficient to
1144  * search for existence of a subkey. Its format is:
1145  *
1146  * 4 bytes num_subkeys
1147  * 4*num_subkey bytes offset into the string array
1148  * then follows a sorted list of subkeys in uppercase
1149  *
1150  * This record is created by create_sorted_subkeys() on demand if it does not
1151  * exist. scan_parent_subkeys() uses regdb->parse_record to search the sorted
1152  * list, the parsing code and the binary search can be found in
1153  * parent_subkey_scanner. The code uses parse_record() to avoid a memcpy of
1154  * the potentially large subkey record.
1155  *
1156  * The sorted subkey record is deleted in regdb_store_keys_internal2 and
1157  * recreated on demand.
1158  */
1159
1160 static int cmp_keynames(const void *p1, const void *p2)
1161 {
1162         return StrCaseCmp(*((char **)p1), *((char **)p2));
1163 }
1164
1165 static bool create_sorted_subkeys(const char *key, const char *sorted_keyname)
1166 {
1167         char **sorted_subkeys;
1168         struct regsubkey_ctr *ctr;
1169         bool result = false;
1170         NTSTATUS status;
1171         char *buf;
1172         char *p;
1173         int i, res;
1174         size_t len;
1175         int num_subkeys;
1176         WERROR werr;
1177
1178         if (regdb->transaction_start(regdb) != 0) {
1179                 DEBUG(0, ("create_sorted_subkeys: transaction_start "
1180                           "failed\n"));
1181                 return false;
1182         }
1183
1184         werr = regsubkey_ctr_init(talloc_tos(), &ctr);
1185         if (!W_ERROR_IS_OK(werr)) {
1186                 goto fail;
1187         }
1188
1189         res = regdb_fetch_keys_internal(regdb, key, ctr);
1190         if (res == -1) {
1191                 goto fail;
1192         }
1193
1194         num_subkeys = regsubkey_ctr_numkeys(ctr);
1195         sorted_subkeys = talloc_array(ctr, char *, num_subkeys);
1196         if (sorted_subkeys == NULL) {
1197                 goto fail;
1198         }
1199
1200         len = 4 + 4*num_subkeys;
1201
1202         for (i = 0; i < num_subkeys; i++) {
1203                 sorted_subkeys[i] = talloc_strdup_upper(sorted_subkeys,
1204                                         regsubkey_ctr_specific_key(ctr, i));
1205                 if (sorted_subkeys[i] == NULL) {
1206                         goto fail;
1207                 }
1208                 len += strlen(sorted_subkeys[i])+1;
1209         }
1210
1211         qsort(sorted_subkeys, num_subkeys, sizeof(char *), cmp_keynames);
1212
1213         buf = talloc_array(ctr, char, len);
1214         if (buf == NULL) {
1215                 goto fail;
1216         }
1217         p = buf + 4 + 4*num_subkeys;
1218
1219         SIVAL(buf, 0, num_subkeys);
1220
1221         for (i=0; i < num_subkeys; i++) {
1222                 ptrdiff_t offset = p - buf;
1223                 SIVAL(buf, 4 + 4*i, offset);
1224                 strlcpy(p, sorted_subkeys[i], len-offset);
1225                 p += strlen(sorted_subkeys[i]) + 1;
1226         }
1227
1228         status = dbwrap_store_bystring(
1229                 regdb, sorted_keyname, make_tdb_data((uint8_t *)buf, len),
1230                 TDB_REPLACE);
1231         if (!NT_STATUS_IS_OK(status)) {
1232                 /*
1233                  * Don't use a "goto fail;" here, this would commit the broken
1234                  * transaction. See below for an explanation.
1235                  */
1236                 if (regdb->transaction_cancel(regdb) == -1) {
1237                         smb_panic("create_sorted_subkeys: transaction_cancel "
1238                                   "failed\n");
1239                 }
1240                 TALLOC_FREE(ctr);
1241                 return false;
1242         }
1243
1244         result = true;
1245  fail:
1246         /*
1247          * We only get here via the "goto fail" when we did not write anything
1248          * yet. Using transaction_commit even in a failure case is necessary
1249          * because this (disposable) call might be nested in other
1250          * transactions. Doing a cancel here would destroy the possibility of
1251          * a transaction_commit for transactions that we might be wrapped in.
1252          */
1253         if (regdb->transaction_commit(regdb) == -1) {
1254                 DEBUG(0, ("create_sorted_subkeys: transaction_commit "
1255                           "failed\n"));
1256                 result = false;
1257         }
1258
1259         TALLOC_FREE(ctr);
1260         return result;
1261 }
1262
1263 struct scan_subkey_state {
1264         char *name;
1265         bool scanned;
1266         bool found;
1267 };
1268
1269 static int parent_subkey_scanner(TDB_DATA key, TDB_DATA data,
1270                                  void *private_data)
1271 {
1272         struct scan_subkey_state *state =
1273                 (struct scan_subkey_state *)private_data;
1274         uint32_t num_subkeys;
1275         uint32_t l, u;
1276
1277         if (data.dsize < sizeof(uint32_t)) {
1278                 return -1;
1279         }
1280
1281         state->scanned = true;
1282         state->found = false;
1283
1284         tdb_unpack(data.dptr, data.dsize, "d", &num_subkeys);
1285
1286         l = 0;
1287         u = num_subkeys;
1288
1289         while (l < u) {
1290                 uint32_t idx = (l+u)/2;
1291                 char *s = (char *)data.dptr + IVAL(data.dptr, 4 + 4*idx);
1292                 int comparison = strcmp(state->name, s);
1293
1294                 if (comparison < 0) {
1295                         u = idx;
1296                 } else if (comparison > 0) {
1297                         l = idx + 1;
1298                 } else {
1299                         state->found = true;
1300                         return 0;
1301                 }
1302         }
1303         return 0;
1304 }
1305
1306 static bool scan_parent_subkeys(struct db_context *db, const char *parent,
1307                                 const char *name)
1308 {
1309         char *path = NULL;
1310         char *key = NULL;
1311         struct scan_subkey_state state = { 0, };
1312         bool result = false;
1313         int res;
1314
1315         state.name = NULL;
1316
1317         path = normalize_reg_path(talloc_tos(), parent);
1318         if (path == NULL) {
1319                 goto fail;
1320         }
1321
1322         key = talloc_asprintf(talloc_tos(), "%s/%s",
1323                               REG_SORTED_SUBKEYS_PREFIX, path);
1324         if (key == NULL) {
1325                 goto fail;
1326         }
1327
1328         state.name = talloc_strdup_upper(talloc_tos(), name);
1329         if (state.name == NULL) {
1330                 goto fail;
1331         }
1332         state.scanned = false;
1333
1334         res = db->parse_record(db, string_term_tdb_data(key),
1335                                parent_subkey_scanner, &state);
1336
1337         if (state.scanned) {
1338                 result = state.found;
1339         } else {
1340                 if (!create_sorted_subkeys(path, key)) {
1341                         goto fail;
1342                 }
1343                 res = db->parse_record(db, string_term_tdb_data(key),
1344                                        parent_subkey_scanner, &state);
1345                 if ((res == 0) && (state.scanned)) {
1346                         result = state.found;
1347                 }
1348         }
1349
1350  fail:
1351         TALLOC_FREE(path);
1352         TALLOC_FREE(state.name);
1353         return result;
1354 }
1355
1356 /**
1357  * Check for the existence of a key.
1358  *
1359  * Existence of a key is authoritatively defined by its
1360  * existence in the list of subkeys of its parent key.
1361  * The exeption of this are keys without a parent key,
1362  * i.e. the "base" keys (HKLM, HKCU, ...).
1363  */
1364 static bool regdb_key_exists(struct db_context *db, const char *key)
1365 {
1366         TALLOC_CTX *mem_ctx = talloc_stackframe();
1367         TDB_DATA value;
1368         bool ret = false;
1369         char *path, *p;
1370
1371         if (key == NULL) {
1372                 goto done;
1373         }
1374
1375         path = normalize_reg_path(mem_ctx, key);
1376         if (path == NULL) {
1377                 DEBUG(0, ("out of memory! (talloc failed)\n"));
1378                 goto done;
1379         }
1380
1381         if (*path == '\0') {
1382                 goto done;
1383         }
1384
1385         p = strrchr(path, '/');
1386         if (p == NULL) {
1387                 /* this is a base key */
1388                 value = regdb_fetch_key_internal(db, mem_ctx, path);
1389                 ret = (value.dptr != NULL);
1390         } else {
1391                 *p = '\0';
1392                 ret = scan_parent_subkeys(db, path, p+1);
1393         }
1394
1395 done:
1396         TALLOC_FREE(mem_ctx);
1397         return ret;
1398 }
1399
1400
1401 /***********************************************************************
1402  Retrieve an array of strings containing subkeys.  Memory should be
1403  released by the caller.
1404  ***********************************************************************/
1405
1406 static int regdb_fetch_keys_internal(struct db_context *db, const char *key,
1407                                      struct regsubkey_ctr *ctr)
1408 {
1409         WERROR werr;
1410         uint32 num_items;
1411         uint8 *buf;
1412         uint32 buflen, len;
1413         int i;
1414         fstring subkeyname;
1415         int ret = -1;
1416         TALLOC_CTX *frame = talloc_stackframe();
1417         TDB_DATA value;
1418
1419         DEBUG(11,("regdb_fetch_keys: Enter key => [%s]\n", key ? key : "NULL"));
1420
1421         if (!regdb_key_exists(db, key)) {
1422                 goto done;
1423         }
1424
1425         werr = regsubkey_ctr_set_seqnum(ctr, db->get_seqnum(db));
1426         if (!W_ERROR_IS_OK(werr)) {
1427                 goto done;
1428         }
1429
1430         value = regdb_fetch_key_internal(db, frame, key);
1431
1432         if (value.dptr == NULL) {
1433                 DEBUG(10, ("regdb_fetch_keys: no subkeys found for key [%s]\n",
1434                            key));
1435                 ret = 0;
1436                 goto done;
1437         }
1438
1439         buf = value.dptr;
1440         buflen = value.dsize;
1441         len = tdb_unpack( buf, buflen, "d", &num_items);
1442
1443         for (i=0; i<num_items; i++) {
1444                 len += tdb_unpack(buf+len, buflen-len, "f", subkeyname);
1445                 werr = regsubkey_ctr_addkey(ctr, subkeyname);
1446                 if (!W_ERROR_IS_OK(werr)) {
1447                         DEBUG(5, ("regdb_fetch_keys: regsubkey_ctr_addkey "
1448                                   "failed: %s\n", win_errstr(werr)));
1449                         goto done;
1450                 }
1451         }
1452
1453         DEBUG(11,("regdb_fetch_keys: Exit [%d] items\n", num_items));
1454
1455         ret = num_items;
1456 done:
1457         TALLOC_FREE(frame);
1458         return ret;
1459 }
1460
1461 int regdb_fetch_keys(const char *key, struct regsubkey_ctr *ctr)
1462 {
1463         return regdb_fetch_keys_internal(regdb, key, ctr);
1464 }
1465
1466 /****************************************************************************
1467  Unpack a list of registry values frem the TDB
1468  ***************************************************************************/
1469
1470 static int regdb_unpack_values(struct regval_ctr *values, uint8 *buf, int buflen)
1471 {
1472         int             len = 0;
1473         uint32          type;
1474         fstring valuename;
1475         uint32          size;
1476         uint8           *data_p;
1477         uint32          num_values = 0;
1478         int             i;
1479
1480         /* loop and unpack the rest of the registry values */
1481
1482         len += tdb_unpack(buf+len, buflen-len, "d", &num_values);
1483
1484         for ( i=0; i<num_values; i++ ) {
1485                 /* unpack the next regval */
1486
1487                 type = REG_NONE;
1488                 size = 0;
1489                 data_p = NULL;
1490                 valuename[0] = '\0';
1491                 len += tdb_unpack(buf+len, buflen-len, "fdB",
1492                                   valuename,
1493                                   &type,
1494                                   &size,
1495                                   &data_p);
1496
1497                 /* add the new value. Paranoid protective code -- make sure data_p is valid */
1498
1499                 if (*valuename && size && data_p) {
1500                         regval_ctr_addvalue(values, valuename, type,
1501                                         (const char *)data_p, size);
1502                 }
1503                 SAFE_FREE(data_p); /* 'B' option to tdb_unpack does a malloc() */
1504
1505                 DEBUG(8,("specific: [%s], len: %d\n", valuename, size));
1506         }
1507
1508         return len;
1509 }
1510
1511 /****************************************************************************
1512  Pack all values in all printer keys
1513  ***************************************************************************/
1514
1515 static int regdb_pack_values(struct regval_ctr *values, uint8 *buf, int buflen)
1516 {
1517         int             len = 0;
1518         int             i;
1519         struct regval_blob      *val;
1520         int             num_values;
1521
1522         if ( !values )
1523                 return 0;
1524
1525         num_values = regval_ctr_numvals( values );
1526
1527         /* pack the number of values first */
1528
1529         len += tdb_pack( buf+len, buflen-len, "d", num_values );
1530
1531         /* loop over all values */
1532
1533         for ( i=0; i<num_values; i++ ) {
1534                 val = regval_ctr_specific_value( values, i );
1535                 len += tdb_pack(buf+len, buflen-len, "fdB",
1536                                 regval_name(val),
1537                                 regval_type(val),
1538                                 regval_size(val),
1539                                 regval_data_p(val) );
1540         }
1541
1542         return len;
1543 }
1544
1545 /***********************************************************************
1546  Retrieve an array of strings containing subkeys.  Memory should be
1547  released by the caller.
1548  ***********************************************************************/
1549
1550 static int regdb_fetch_values_internal(struct db_context *db, const char* key,
1551                                        struct regval_ctr *values)
1552 {
1553         char *keystr = NULL;
1554         TALLOC_CTX *ctx = talloc_stackframe();
1555         int ret = 0;
1556         TDB_DATA value;
1557
1558         DEBUG(10,("regdb_fetch_values: Looking for value of key [%s] \n", key));
1559
1560         if (!regdb_key_exists(db, key)) {
1561                 goto done;
1562         }
1563
1564         keystr = talloc_asprintf(ctx, "%s/%s", REG_VALUE_PREFIX, key);
1565         if (!keystr) {
1566                 goto done;
1567         }
1568
1569         values->seqnum = db->get_seqnum(db);
1570
1571         value = regdb_fetch_key_internal(db, ctx, keystr);
1572
1573         if (!value.dptr) {
1574                 /* all keys have zero values by default */
1575                 goto done;
1576         }
1577
1578         regdb_unpack_values(values, value.dptr, value.dsize);
1579         ret = regval_ctr_numvals(values);
1580
1581 done:
1582         TALLOC_FREE(ctx);
1583         return ret;
1584 }
1585
1586 int regdb_fetch_values(const char* key, struct regval_ctr *values)
1587 {
1588         return regdb_fetch_values_internal(regdb, key, values);
1589 }
1590
1591 static bool regdb_store_values_internal(struct db_context *db, const char *key,
1592                                         struct regval_ctr *values)
1593 {
1594         TDB_DATA old_data, data;
1595         char *keystr = NULL;
1596         TALLOC_CTX *ctx = talloc_stackframe();
1597         int len;
1598         NTSTATUS status;
1599         bool result = false;
1600
1601         DEBUG(10,("regdb_store_values: Looking for value of key [%s] \n", key));
1602
1603         if (!regdb_key_exists(db, key)) {
1604                 goto done;
1605         }
1606
1607         ZERO_STRUCT(data);
1608
1609         len = regdb_pack_values(values, data.dptr, data.dsize);
1610         if (len <= 0) {
1611                 DEBUG(0,("regdb_store_values: unable to pack values. len <= 0\n"));
1612                 goto done;
1613         }
1614
1615         data.dptr = TALLOC_ARRAY(ctx, uint8, len);
1616         data.dsize = len;
1617
1618         len = regdb_pack_values(values, data.dptr, data.dsize);
1619
1620         SMB_ASSERT( len == data.dsize );
1621
1622         keystr = talloc_asprintf(ctx, "%s/%s", REG_VALUE_PREFIX, key );
1623         if (!keystr) {
1624                 goto done;
1625         }
1626         keystr = normalize_reg_path(ctx, keystr);
1627         if (!keystr) {
1628                 goto done;
1629         }
1630
1631         old_data = dbwrap_fetch_bystring(db, ctx, keystr);
1632
1633         if ((old_data.dptr != NULL)
1634             && (old_data.dsize == data.dsize)
1635             && (memcmp(old_data.dptr, data.dptr, data.dsize) == 0))
1636         {
1637                 result = true;
1638                 goto done;
1639         }
1640
1641         status = dbwrap_trans_store_bystring(db, keystr, data, TDB_REPLACE);
1642
1643         result = NT_STATUS_IS_OK(status);
1644
1645 done:
1646         TALLOC_FREE(ctx);
1647         return result;
1648 }
1649
1650 bool regdb_store_values(const char *key, struct regval_ctr *values)
1651 {
1652         return regdb_store_values_internal(regdb, key, values);
1653 }
1654
1655 static WERROR regdb_get_secdesc(TALLOC_CTX *mem_ctx, const char *key,
1656                                 struct security_descriptor **psecdesc)
1657 {
1658         char *tdbkey;
1659         TDB_DATA data;
1660         NTSTATUS status;
1661         TALLOC_CTX *tmp_ctx = talloc_stackframe();
1662         WERROR err = WERR_OK;
1663
1664         DEBUG(10, ("regdb_get_secdesc: Getting secdesc of key [%s]\n", key));
1665
1666         if (!regdb_key_exists(regdb, key)) {
1667                 err = WERR_BADFILE;
1668                 goto done;
1669         }
1670
1671         tdbkey = talloc_asprintf(tmp_ctx, "%s/%s", REG_SECDESC_PREFIX, key);
1672         if (tdbkey == NULL) {
1673                 err = WERR_NOMEM;
1674                 goto done;
1675         }
1676         normalize_dbkey(tdbkey);
1677
1678         data = dbwrap_fetch_bystring(regdb, tmp_ctx, tdbkey);
1679         if (data.dptr == NULL) {
1680                 err = WERR_BADFILE;
1681                 goto done;
1682         }
1683
1684         status = unmarshall_sec_desc(mem_ctx, (uint8 *)data.dptr, data.dsize,
1685                                      psecdesc);
1686
1687         if (NT_STATUS_EQUAL(status, NT_STATUS_NO_MEMORY)) {
1688                 err = WERR_NOMEM;
1689         } else if (!NT_STATUS_IS_OK(status)) {
1690                 err = WERR_REG_CORRUPT;
1691         }
1692
1693 done:
1694         TALLOC_FREE(tmp_ctx);
1695         return err;
1696 }
1697
1698 static WERROR regdb_set_secdesc(const char *key,
1699                                 struct security_descriptor *secdesc)
1700 {
1701         TALLOC_CTX *mem_ctx = talloc_stackframe();
1702         char *tdbkey;
1703         WERROR err = WERR_NOMEM;
1704         TDB_DATA tdbdata;
1705
1706         if (!regdb_key_exists(regdb, key)) {
1707                 err = WERR_BADFILE;
1708                 goto done;
1709         }
1710
1711         tdbkey = talloc_asprintf(mem_ctx, "%s/%s", REG_SECDESC_PREFIX, key);
1712         if (tdbkey == NULL) {
1713                 goto done;
1714         }
1715         normalize_dbkey(tdbkey);
1716
1717         if (secdesc == NULL) {
1718                 /* assuming a delete */
1719                 err = ntstatus_to_werror(dbwrap_trans_delete_bystring(regdb,
1720                                                                       tdbkey));
1721                 goto done;
1722         }
1723
1724         err = ntstatus_to_werror(marshall_sec_desc(mem_ctx, secdesc,
1725                                                    &tdbdata.dptr,
1726                                                    &tdbdata.dsize));
1727         W_ERROR_NOT_OK_GOTO_DONE(err);
1728
1729         err = ntstatus_to_werror(dbwrap_trans_store_bystring(regdb, tdbkey,
1730                                                              tdbdata, 0));
1731
1732  done:
1733         TALLOC_FREE(mem_ctx);
1734         return err;
1735 }
1736
1737 bool regdb_subkeys_need_update(struct regsubkey_ctr *subkeys)
1738 {
1739         return (regdb_get_seqnum() != regsubkey_ctr_get_seqnum(subkeys));
1740 }
1741
1742 bool regdb_values_need_update(struct regval_ctr *values)
1743 {
1744         return (regdb_get_seqnum() != values->seqnum);
1745 }
1746
1747 /* 
1748  * Table of function pointers for default access
1749  */
1750  
1751 struct registry_ops regdb_ops = {
1752         .fetch_subkeys = regdb_fetch_keys,
1753         .fetch_values = regdb_fetch_values,
1754         .store_subkeys = regdb_store_keys,
1755         .store_values = regdb_store_values,
1756         .create_subkey = regdb_create_subkey,
1757         .delete_subkey = regdb_delete_subkey,
1758         .get_secdesc = regdb_get_secdesc,
1759         .set_secdesc = regdb_set_secdesc,
1760         .subkeys_need_update = regdb_subkeys_need_update,
1761         .values_need_update = regdb_values_need_update
1762 };