source: vendor/3.5.0/lib/smbconf/smbconf_txt.c

Last change on this file was 414, checked in by Herwig Bauernfeind, 16 years ago

Samba 3.5.0: Initial import
File size: 15.1 KB
Line 
1/*
2 * Unix SMB/CIFS implementation.
3 * libsmbconf - Samba configuration library, text backend
4 * Copyright (C) Michael Adam 2008
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/*
21 * This is a sample implementation of a libsmbconf text backend
22 * using the params.c parser.
23 *
24 * It is read only.
25 * Don't expect brilliant performance, since it is not hashing the lists.
26 */
27
28#include "includes.h"
29#include "smbconf_private.h"
30
31struct txt_cache {
32 uint32_t current_share;
33 uint32_t num_shares;
34 char **share_names;
35 uint32_t *num_params;
36 char ***param_names;
37 char ***param_values;
38};
39
40struct txt_private_data {
41 struct txt_cache *cache;
42 uint64_t csn;
43 bool verbatim;
44};
45
46/**********************************************************************
47 *
48 * helper functions
49 *
50 **********************************************************************/
51
52/**
53 * a convenience helper to cast the private data structure
54 */
55static struct txt_private_data *pd(struct smbconf_ctx *ctx)
56{
57 return (struct txt_private_data *)(ctx->data);
58}
59
60static bool smbconf_txt_do_section(const char *section, void *private_data)
61{
62 WERROR werr;
63 uint32_t idx;
64 struct txt_private_data *tpd = (struct txt_private_data *)private_data;
65 struct txt_cache *cache = tpd->cache;
66
67 if (smbconf_find_in_array(section, cache->share_names,
68 cache->num_shares, &idx))
69 {
70 cache->current_share = idx;
71 return true;
72 }
73
74 werr = smbconf_add_string_to_array(cache, &(cache->share_names),
75 cache->num_shares, section);
76 if (!W_ERROR_IS_OK(werr)) {
77 return false;
78 }
79 cache->current_share = cache->num_shares;
80 cache->num_shares++;
81
82 cache->param_names = talloc_realloc(cache,
83 cache->param_names,
84 char **,
85 cache->num_shares);
86 if (cache->param_names == NULL) {
87 return false;
88 }
89 cache->param_names[cache->current_share] = NULL;
90
91 cache->param_values = talloc_realloc(cache,
92 cache->param_values,
93 char **,
94 cache->num_shares);
95 if (cache->param_values == NULL) {
96 return false;
97 }
98 cache->param_values[cache->current_share] = NULL;
99
100 cache->num_params = talloc_realloc(cache,
101 cache->num_params,
102 uint32_t,
103 cache->num_shares);
104 if (cache->num_params == NULL) {
105 return false;
106 }
107 cache->num_params[cache->current_share] = 0;
108
109 return true;
110}
111
112static bool smbconf_txt_do_parameter(const char *param_name,
113 const char *param_value,
114 void *private_data)
115{
116 WERROR werr;
117 char **param_names, **param_values;
118 uint32_t num_params;
119 uint32_t idx;
120 struct txt_private_data *tpd = (struct txt_private_data *)private_data;
121 struct txt_cache *cache = tpd->cache;
122
123 if (cache->num_shares == 0) {
124 /*
125 * not in any share yet,
126 * initialize the "empty" section (NULL):
127 * parameters without a previous [section] are stored here.
128 */
129 if (!smbconf_txt_do_section(NULL, private_data)) {
130 return false;
131 }
132 }
133
134 param_names = cache->param_names[cache->current_share];
135 param_values = cache->param_values[cache->current_share];
136 num_params = cache->num_params[cache->current_share];
137
138 if (!(tpd->verbatim) &&
139 smbconf_find_in_array(param_name, param_names, num_params, &idx))
140 {
141 talloc_free(param_values[idx]);
142 param_values[idx] = talloc_strdup(cache, param_value);
143 if (param_values[idx] == NULL) {
144 return false;
145 }
146 return true;
147 }
148 werr = smbconf_add_string_to_array(cache,
149 &(cache->param_names[cache->current_share]),
150 num_params, param_name);
151 if (!W_ERROR_IS_OK(werr)) {
152 return false;
153 }
154 werr = smbconf_add_string_to_array(cache,
155 &(cache->param_values[cache->current_share]),
156 num_params, param_value);
157 cache->num_params[cache->current_share]++;
158 return W_ERROR_IS_OK(werr);
159}
160
161static void smbconf_txt_flush_cache(struct smbconf_ctx *ctx)
162{
163 talloc_free(pd(ctx)->cache);
164 pd(ctx)->cache = NULL;
165}
166
167static WERROR smbconf_txt_init_cache(struct smbconf_ctx *ctx)
168{
169 if (pd(ctx)->cache != NULL) {
170 smbconf_txt_flush_cache(ctx);
171 }
172
173 pd(ctx)->cache = talloc_zero(pd(ctx), struct txt_cache);
174
175 if (pd(ctx)->cache == NULL) {
176 return WERR_NOMEM;
177 }
178
179 return WERR_OK;
180}
181
182static WERROR smbconf_txt_load_file(struct smbconf_ctx *ctx)
183{
184 WERROR werr;
185 uint64_t new_csn;
186
187 if (!file_exist(ctx->path)) {
188 return WERR_BADFILE;
189 }
190
191 new_csn = (uint64_t)file_modtime(ctx->path);
192 if (new_csn == pd(ctx)->csn) {
193 return WERR_OK;
194 }
195
196 werr = smbconf_txt_init_cache(ctx);
197 if (!W_ERROR_IS_OK(werr)) {
198 return werr;
199 }
200
201 if (!pm_process(ctx->path, smbconf_txt_do_section,
202 smbconf_txt_do_parameter, pd(ctx)))
203 {
204 return WERR_CAN_NOT_COMPLETE;
205 }
206
207 pd(ctx)->csn = new_csn;
208
209 return WERR_OK;
210}
211
212
213/**********************************************************************
214 *
215 * smbconf operations: text backend implementations
216 *
217 **********************************************************************/
218
219/**
220 * initialize the text based smbconf backend
221 */
222static WERROR smbconf_txt_init(struct smbconf_ctx *ctx, const char *path)
223{
224 if (path == NULL) {
225 return WERR_BADFILE;
226 }
227 ctx->path = talloc_strdup(ctx, path);
228 if (ctx->path == NULL) {
229 return WERR_NOMEM;
230 }
231
232 ctx->data = talloc_zero(ctx, struct txt_private_data);
233 if (ctx->data == NULL) {
234 return WERR_NOMEM;
235 }
236
237 pd(ctx)->verbatim = true;
238
239 return WERR_OK;
240}
241
242static int smbconf_txt_shutdown(struct smbconf_ctx *ctx)
243{
244 return ctx->ops->close_conf(ctx);
245}
246
247static bool smbconf_txt_requires_messaging(struct smbconf_ctx *ctx)
248{
249 return false;
250}
251
252static bool smbconf_txt_is_writeable(struct smbconf_ctx *ctx)
253{
254 /* no write support in this backend yet... */
255 return false;
256}
257
258static WERROR smbconf_txt_open(struct smbconf_ctx *ctx)
259{
260 return smbconf_txt_load_file(ctx);
261}
262
263static int smbconf_txt_close(struct smbconf_ctx *ctx)
264{
265 smbconf_txt_flush_cache(ctx);
266 return 0;
267}
268
269/**
270 * Get the change sequence number of the given service/parameter.
271 * service and parameter strings may be NULL.
272 */
273static void smbconf_txt_get_csn(struct smbconf_ctx *ctx,
274 struct smbconf_csn *csn,
275 const char *service, const char *param)
276{
277 if (csn == NULL) {
278 return;
279 }
280
281 csn->csn = (uint64_t)file_modtime(ctx->path);
282}
283
284/**
285 * Drop the whole configuration (restarting empty)
286 */
287static WERROR smbconf_txt_drop(struct smbconf_ctx *ctx)
288{
289 return WERR_NOT_SUPPORTED;
290}
291
292/**
293 * get the list of share names defined in the configuration.
294 */
295static WERROR smbconf_txt_get_share_names(struct smbconf_ctx *ctx,
296 TALLOC_CTX *mem_ctx,
297 uint32_t *num_shares,
298 char ***share_names)
299{
300 uint32_t count;
301 uint32_t added_count = 0;
302 TALLOC_CTX *tmp_ctx = NULL;
303 WERROR werr = WERR_OK;
304 char **tmp_share_names = NULL;
305
306 if ((num_shares == NULL) || (share_names == NULL)) {
307 werr = WERR_INVALID_PARAM;
308 goto done;
309 }
310
311 werr = smbconf_txt_load_file(ctx);
312 if (!W_ERROR_IS_OK(werr)) {
313 return werr;
314 }
315
316 tmp_ctx = talloc_stackframe();
317
318 /* make sure "global" is always listed first,
319 * possibly after NULL section */
320
321 if (smbconf_share_exists(ctx, NULL)) {
322 werr = smbconf_add_string_to_array(tmp_ctx, &tmp_share_names,
323 0, NULL);
324 if (!W_ERROR_IS_OK(werr)) {
325 goto done;
326 }
327 added_count++;
328 }
329
330 if (smbconf_share_exists(ctx, GLOBAL_NAME)) {
331 werr = smbconf_add_string_to_array(tmp_ctx, &tmp_share_names,
332 added_count, GLOBAL_NAME);
333 if (!W_ERROR_IS_OK(werr)) {
334 goto done;
335 }
336 added_count++;
337 }
338
339 for (count = 0; count < pd(ctx)->cache->num_shares; count++) {
340 if (strequal(pd(ctx)->cache->share_names[count], GLOBAL_NAME) ||
341 (pd(ctx)->cache->share_names[count] == NULL))
342 {
343 continue;
344 }
345
346 werr = smbconf_add_string_to_array(tmp_ctx, &tmp_share_names,
347 added_count,
348 pd(ctx)->cache->share_names[count]);
349 if (!W_ERROR_IS_OK(werr)) {
350 goto done;
351 }
352 added_count++;
353 }
354
355 *num_shares = added_count;
356 if (added_count > 0) {
357 *share_names = talloc_move(mem_ctx, &tmp_share_names);
358 } else {
359 *share_names = NULL;
360 }
361
362done:
363 talloc_free(tmp_ctx);
364 return werr;
365}
366
367/**
368 * check if a share/service of a given name exists
369 */
370static bool smbconf_txt_share_exists(struct smbconf_ctx *ctx,
371 const char *servicename)
372{
373 WERROR werr;
374
375 werr = smbconf_txt_load_file(ctx);
376 if (!W_ERROR_IS_OK(werr)) {
377 return false;
378 }
379
380 return smbconf_find_in_array(servicename,
381 pd(ctx)->cache->share_names,
382 pd(ctx)->cache->num_shares, NULL);
383}
384
385/**
386 * Add a service if it does not already exist
387 */
388static WERROR smbconf_txt_create_share(struct smbconf_ctx *ctx,
389 const char *servicename)
390{
391 return WERR_NOT_SUPPORTED;
392}
393
394/**
395 * get a definition of a share (service) from configuration.
396 */
397static WERROR smbconf_txt_get_share(struct smbconf_ctx *ctx,
398 TALLOC_CTX *mem_ctx,
399 const char *servicename,
400 struct smbconf_service **service)
401{
402 WERROR werr;
403 uint32_t sidx, count;
404 bool found;
405 TALLOC_CTX *tmp_ctx = NULL;
406 struct smbconf_service *tmp_service = NULL;
407
408 werr = smbconf_txt_load_file(ctx);
409 if (!W_ERROR_IS_OK(werr)) {
410 return werr;
411 }
412
413 found = smbconf_find_in_array(servicename,
414 pd(ctx)->cache->share_names,
415 pd(ctx)->cache->num_shares,
416 &sidx);
417 if (!found) {
418 return WERR_NO_SUCH_SERVICE;
419 }
420
421 tmp_ctx = talloc_stackframe();
422
423 tmp_service = talloc_zero(tmp_ctx, struct smbconf_service);
424 if (tmp_service == NULL) {
425 werr = WERR_NOMEM;
426 goto done;
427 }
428
429 if (servicename != NULL) {
430 tmp_service->name = talloc_strdup(tmp_service, servicename);
431 if (tmp_service->name == NULL) {
432 werr = WERR_NOMEM;
433 goto done;
434 }
435 }
436
437 for (count = 0; count < pd(ctx)->cache->num_params[sidx]; count++) {
438 werr = smbconf_add_string_to_array(tmp_service,
439 &(tmp_service->param_names),
440 count,
441 pd(ctx)->cache->param_names[sidx][count]);
442 if (!W_ERROR_IS_OK(werr)) {
443 goto done;
444 }
445 werr = smbconf_add_string_to_array(tmp_service,
446 &(tmp_service->param_values),
447 count,
448 pd(ctx)->cache->param_values[sidx][count]);
449 if (!W_ERROR_IS_OK(werr)) {
450 goto done;
451 }
452 }
453
454 tmp_service->num_params = count;
455 if (count > 0) {
456 *service = talloc_move(mem_ctx, &tmp_service);
457 } else {
458 *service = NULL;
459 }
460
461done:
462 talloc_free(tmp_ctx);
463 return werr;
464}
465
466/**
467 * delete a service from configuration
468 */
469static WERROR smbconf_txt_delete_share(struct smbconf_ctx *ctx,
470 const char *servicename)
471{
472 return WERR_NOT_SUPPORTED;
473}
474
475/**
476 * set a configuration parameter to the value provided.
477 */
478static WERROR smbconf_txt_set_parameter(struct smbconf_ctx *ctx,
479 const char *service,
480 const char *param,
481 const char *valstr)
482{
483 return WERR_NOT_SUPPORTED;
484}
485
486/**
487 * get the value of a configuration parameter as a string
488 */
489static WERROR smbconf_txt_get_parameter(struct smbconf_ctx *ctx,
490 TALLOC_CTX *mem_ctx,
491 const char *service,
492 const char *param,
493 char **valstr)
494{
495 WERROR werr;
496 bool found;
497 uint32_t share_index, param_index;
498
499 werr = smbconf_txt_load_file(ctx);
500 if (!W_ERROR_IS_OK(werr)) {
501 return werr;
502 }
503
504 found = smbconf_find_in_array(service,
505 pd(ctx)->cache->share_names,
506 pd(ctx)->cache->num_shares,
507 &share_index);
508 if (!found) {
509 return WERR_NO_SUCH_SERVICE;
510 }
511
512 found = smbconf_reverse_find_in_array(param,
513 pd(ctx)->cache->param_names[share_index],
514 pd(ctx)->cache->num_params[share_index],
515 &param_index);
516 if (!found) {
517 return WERR_INVALID_PARAM;
518 }
519
520 *valstr = talloc_strdup(mem_ctx,
521 pd(ctx)->cache->param_values[share_index][param_index]);
522
523 if (*valstr == NULL) {
524 return WERR_NOMEM;
525 }
526
527 return WERR_OK;
528}
529
530/**
531 * delete a parameter from configuration
532 */
533static WERROR smbconf_txt_delete_parameter(struct smbconf_ctx *ctx,
534 const char *service,
535 const char *param)
536{
537 return WERR_NOT_SUPPORTED;
538}
539
540static WERROR smbconf_txt_get_includes(struct smbconf_ctx *ctx,
541 TALLOC_CTX *mem_ctx,
542 const char *service,
543 uint32_t *num_includes,
544 char ***includes)
545{
546 WERROR werr;
547 bool found;
548 uint32_t sidx, count;
549 TALLOC_CTX *tmp_ctx = NULL;
550 uint32_t tmp_num_includes = 0;
551 char **tmp_includes = NULL;
552
553 werr = smbconf_txt_load_file(ctx);
554 if (!W_ERROR_IS_OK(werr)) {
555 return werr;
556 }
557
558 found = smbconf_find_in_array(service,
559 pd(ctx)->cache->share_names,
560 pd(ctx)->cache->num_shares,
561 &sidx);
562 if (!found) {
563 return WERR_NO_SUCH_SERVICE;
564 }
565
566 tmp_ctx = talloc_stackframe();
567
568 for (count = 0; count < pd(ctx)->cache->num_params[sidx]; count++) {
569 if (strequal(pd(ctx)->cache->param_names[sidx][count],
570 "include"))
571 {
572 werr = smbconf_add_string_to_array(tmp_ctx,
573 &tmp_includes,
574 tmp_num_includes,
575 pd(ctx)->cache->param_values[sidx][count]);
576 if (!W_ERROR_IS_OK(werr)) {
577 goto done;
578 }
579 tmp_num_includes++;
580 }
581 }
582
583 *num_includes = tmp_num_includes;
584 if (*num_includes > 0) {
585 *includes = talloc_move(mem_ctx, &tmp_includes);
586 if (*includes == NULL) {
587 werr = WERR_NOMEM;
588 goto done;
589 }
590 } else {
591 *includes = NULL;
592 }
593
594 werr = WERR_OK;
595
596done:
597 talloc_free(tmp_ctx);
598 return werr;
599}
600
601static WERROR smbconf_txt_set_includes(struct smbconf_ctx *ctx,
602 const char *service,
603 uint32_t num_includes,
604 const char **includes)
605{
606 return WERR_NOT_SUPPORTED;
607}
608
609static WERROR smbconf_txt_delete_includes(struct smbconf_ctx *ctx,
610 const char *service)
611{
612 return WERR_NOT_SUPPORTED;
613}
614
615static WERROR smbconf_txt_transaction_start(struct smbconf_ctx *ctx)
616{
617 return WERR_OK;
618}
619
620static WERROR smbconf_txt_transaction_commit(struct smbconf_ctx *ctx)
621{
622 return WERR_OK;
623}
624
625static WERROR smbconf_txt_transaction_cancel(struct smbconf_ctx *ctx)
626{
627 return WERR_OK;
628}
629
630static struct smbconf_ops smbconf_ops_txt = {
631 .init = smbconf_txt_init,
632 .shutdown = smbconf_txt_shutdown,
633 .requires_messaging = smbconf_txt_requires_messaging,
634 .is_writeable = smbconf_txt_is_writeable,
635 .open_conf = smbconf_txt_open,
636 .close_conf = smbconf_txt_close,
637 .get_csn = smbconf_txt_get_csn,
638 .drop = smbconf_txt_drop,
639 .get_share_names = smbconf_txt_get_share_names,
640 .share_exists = smbconf_txt_share_exists,
641 .create_share = smbconf_txt_create_share,
642 .get_share = smbconf_txt_get_share,
643 .delete_share = smbconf_txt_delete_share,
644 .set_parameter = smbconf_txt_set_parameter,
645 .get_parameter = smbconf_txt_get_parameter,
646 .delete_parameter = smbconf_txt_delete_parameter,
647 .get_includes = smbconf_txt_get_includes,
648 .set_includes = smbconf_txt_set_includes,
649 .delete_includes = smbconf_txt_delete_includes,
650 .transaction_start = smbconf_txt_transaction_start,
651 .transaction_commit = smbconf_txt_transaction_commit,
652 .transaction_cancel = smbconf_txt_transaction_cancel,
653};
654
655
656/**
657 * initialize the smbconf text backend
658 * the only function that is exported from this module
659 */
660WERROR smbconf_init_txt(TALLOC_CTX *mem_ctx,
661 struct smbconf_ctx **conf_ctx,
662 const char *path)
663{
664 WERROR werr;
665
666 werr = smbconf_init_internal(mem_ctx, conf_ctx, path, &smbconf_ops_txt);
667 if (!W_ERROR_IS_OK(werr)) {
668 return werr;
669 }
670
671 return smbconf_txt_load_file(*conf_ctx);
672}
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