source: trunk/server/lib/smbconf/smbconf_txt.c

Last change on this file was 745, checked in by Silvan Scherrer, 13 years ago

Samba Server: updated trunk to 3.6.0
File size: 15.8 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#include "lib/smbconf/smbconf_txt.h"
31
32struct txt_cache {
33 uint32_t current_share;
34 uint32_t num_shares;
35 char **share_names;
36 uint32_t *num_params;
37 char ***param_names;
38 char ***param_values;
39};
40
41struct txt_private_data {
42 struct txt_cache *cache;
43 uint64_t csn;
44 bool verbatim;
45};
46
47/**********************************************************************
48 *
49 * helper functions
50 *
51 **********************************************************************/
52
53/**
54 * a convenience helper to cast the private data structure
55 */
56static struct txt_private_data *pd(struct smbconf_ctx *ctx)
57{
58 return (struct txt_private_data *)(ctx->data);
59}
60
61static bool smbconf_txt_do_section(const char *section, void *private_data)
62{
63 sbcErr err;
64 uint32_t idx;
65 struct txt_private_data *tpd = (struct txt_private_data *)private_data;
66 struct txt_cache *cache = tpd->cache;
67
68 if (smbconf_find_in_array(section, cache->share_names,
69 cache->num_shares, &idx))
70 {
71 cache->current_share = idx;
72 return true;
73 }
74
75 err = smbconf_add_string_to_array(cache, &(cache->share_names),
76 cache->num_shares, section);
77 if (!SBC_ERROR_IS_OK(err)) {
78 return false;
79 }
80 cache->current_share = cache->num_shares;
81 cache->num_shares++;
82
83 cache->param_names = talloc_realloc(cache,
84 cache->param_names,
85 char **,
86 cache->num_shares);
87 if (cache->param_names == NULL) {
88 return false;
89 }
90 cache->param_names[cache->current_share] = NULL;
91
92 cache->param_values = talloc_realloc(cache,
93 cache->param_values,
94 char **,
95 cache->num_shares);
96 if (cache->param_values == NULL) {
97 return false;
98 }
99 cache->param_values[cache->current_share] = NULL;
100
101 cache->num_params = talloc_realloc(cache,
102 cache->num_params,
103 uint32_t,
104 cache->num_shares);
105 if (cache->num_params == NULL) {
106 return false;
107 }
108 cache->num_params[cache->current_share] = 0;
109
110 return true;
111}
112
113static bool smbconf_txt_do_parameter(const char *param_name,
114 const char *param_value,
115 void *private_data)
116{
117 sbcErr err;
118 char **param_names, **param_values;
119 uint32_t num_params;
120 uint32_t idx;
121 struct txt_private_data *tpd = (struct txt_private_data *)private_data;
122 struct txt_cache *cache = tpd->cache;
123
124 if (cache->num_shares == 0) {
125 /*
126 * not in any share yet,
127 * initialize the "empty" section (NULL):
128 * parameters without a previous [section] are stored here.
129 */
130 if (!smbconf_txt_do_section(NULL, private_data)) {
131 return false;
132 }
133 }
134
135 param_names = cache->param_names[cache->current_share];
136 param_values = cache->param_values[cache->current_share];
137 num_params = cache->num_params[cache->current_share];
138
139 if (!(tpd->verbatim) &&
140 smbconf_find_in_array(param_name, param_names, num_params, &idx))
141 {
142 talloc_free(param_values[idx]);
143 param_values[idx] = talloc_strdup(cache, param_value);
144 if (param_values[idx] == NULL) {
145 return false;
146 }
147 return true;
148 }
149 err = smbconf_add_string_to_array(cache,
150 &(cache->param_names[cache->current_share]),
151 num_params, param_name);
152 if (!SBC_ERROR_IS_OK(err)) {
153 return false;
154 }
155 err = smbconf_add_string_to_array(cache,
156 &(cache->param_values[cache->current_share]),
157 num_params, param_value);
158 cache->num_params[cache->current_share]++;
159 return SBC_ERROR_IS_OK(err);
160}
161
162static void smbconf_txt_flush_cache(struct smbconf_ctx *ctx)
163{
164 talloc_free(pd(ctx)->cache);
165 pd(ctx)->cache = NULL;
166}
167
168static sbcErr smbconf_txt_init_cache(struct smbconf_ctx *ctx)
169{
170 if (pd(ctx)->cache != NULL) {
171 smbconf_txt_flush_cache(ctx);
172 }
173
174 pd(ctx)->cache = talloc_zero(pd(ctx), struct txt_cache);
175
176 if (pd(ctx)->cache == NULL) {
177 return SBC_ERR_NOMEM;
178 }
179
180 return SBC_ERR_OK;
181}
182
183static sbcErr smbconf_txt_load_file(struct smbconf_ctx *ctx)
184{
185 sbcErr err;
186 uint64_t new_csn;
187
188 if (!file_exist(ctx->path)) {
189 return SBC_ERR_BADFILE;
190 }
191
192 new_csn = (uint64_t)file_modtime(ctx->path);
193 if (new_csn == pd(ctx)->csn) {
194 return SBC_ERR_OK;
195 }
196
197 err = smbconf_txt_init_cache(ctx);
198 if (!SBC_ERROR_IS_OK(err)) {
199 return err;
200 }
201
202 if (!pm_process(ctx->path, smbconf_txt_do_section,
203 smbconf_txt_do_parameter, pd(ctx)))
204 {
205 return SBC_ERR_CAN_NOT_COMPLETE;
206 }
207
208 pd(ctx)->csn = new_csn;
209
210 return SBC_ERR_OK;
211}
212
213
214/**********************************************************************
215 *
216 * smbconf operations: text backend implementations
217 *
218 **********************************************************************/
219
220/**
221 * initialize the text based smbconf backend
222 */
223static sbcErr smbconf_txt_init(struct smbconf_ctx *ctx, const char *path)
224{
225 if (path == NULL) {
226 return SBC_ERR_BADFILE;
227 }
228 ctx->path = talloc_strdup(ctx, path);
229 if (ctx->path == NULL) {
230 return SBC_ERR_NOMEM;
231 }
232
233 ctx->data = talloc_zero(ctx, struct txt_private_data);
234 if (ctx->data == NULL) {
235 return SBC_ERR_NOMEM;
236 }
237
238 pd(ctx)->verbatim = true;
239
240 return SBC_ERR_OK;
241}
242
243static int smbconf_txt_shutdown(struct smbconf_ctx *ctx)
244{
245 return ctx->ops->close_conf(ctx);
246}
247
248static bool smbconf_txt_requires_messaging(struct smbconf_ctx *ctx)
249{
250 return false;
251}
252
253static bool smbconf_txt_is_writeable(struct smbconf_ctx *ctx)
254{
255 /* no write support in this backend yet... */
256 return false;
257}
258
259static sbcErr smbconf_txt_open(struct smbconf_ctx *ctx)
260{
261 return smbconf_txt_load_file(ctx);
262}
263
264static int smbconf_txt_close(struct smbconf_ctx *ctx)
265{
266 smbconf_txt_flush_cache(ctx);
267 return 0;
268}
269
270/**
271 * Get the change sequence number of the given service/parameter.
272 * service and parameter strings may be NULL.
273 */
274static void smbconf_txt_get_csn(struct smbconf_ctx *ctx,
275 struct smbconf_csn *csn,
276 const char *service, const char *param)
277{
278 if (csn == NULL) {
279 return;
280 }
281
282 csn->csn = (uint64_t)file_modtime(ctx->path);
283}
284
285/**
286 * Drop the whole configuration (restarting empty)
287 */
288static sbcErr smbconf_txt_drop(struct smbconf_ctx *ctx)
289{
290 return SBC_ERR_NOT_SUPPORTED;
291}
292
293/**
294 * get the list of share names defined in the configuration.
295 */
296static sbcErr smbconf_txt_get_share_names(struct smbconf_ctx *ctx,
297 TALLOC_CTX *mem_ctx,
298 uint32_t *num_shares,
299 char ***share_names)
300{
301 uint32_t count;
302 uint32_t added_count = 0;
303 TALLOC_CTX *tmp_ctx = NULL;
304 sbcErr err = SBC_ERR_OK;
305 char **tmp_share_names = NULL;
306
307 if ((num_shares == NULL) || (share_names == NULL)) {
308 return SBC_ERR_INVALID_PARAM;
309 }
310
311 err = smbconf_txt_load_file(ctx);
312 if (!SBC_ERROR_IS_OK(err)) {
313 return err;
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 err = smbconf_add_string_to_array(tmp_ctx, &tmp_share_names,
323 0, NULL);
324 if (!SBC_ERROR_IS_OK(err)) {
325 goto done;
326 }
327 added_count++;
328 }
329
330 if (smbconf_share_exists(ctx, GLOBAL_NAME)) {
331 err = smbconf_add_string_to_array(tmp_ctx, &tmp_share_names,
332 added_count, GLOBAL_NAME);
333 if (!SBC_ERROR_IS_OK(err)) {
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 err = smbconf_add_string_to_array(tmp_ctx, &tmp_share_names,
347 added_count,
348 pd(ctx)->cache->share_names[count]);
349 if (!SBC_ERROR_IS_OK(err)) {
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 err;
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 sbcErr err;
374
375 err = smbconf_txt_load_file(ctx);
376 if (!SBC_ERROR_IS_OK(err)) {
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 sbcErr smbconf_txt_create_share(struct smbconf_ctx *ctx,
389 const char *servicename)
390{
391 return SBC_ERR_NOT_SUPPORTED;
392}
393
394/**
395 * get a definition of a share (service) from configuration.
396 */
397static sbcErr smbconf_txt_get_share(struct smbconf_ctx *ctx,
398 TALLOC_CTX *mem_ctx,
399 const char *servicename,
400 struct smbconf_service **service)
401{
402 sbcErr err;
403 uint32_t sidx, count;
404 bool found;
405 TALLOC_CTX *tmp_ctx = NULL;
406 struct smbconf_service *tmp_service = NULL;
407
408 err = smbconf_txt_load_file(ctx);
409 if (!SBC_ERROR_IS_OK(err)) {
410 return err;
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 SBC_ERR_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 err = SBC_ERR_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 err = SBC_ERR_NOMEM;
433 goto done;
434 }
435 }
436
437 for (count = 0; count < pd(ctx)->cache->num_params[sidx]; count++) {
438 err = smbconf_add_string_to_array(tmp_service,
439 &(tmp_service->param_names),
440 count,
441 pd(ctx)->cache->param_names[sidx][count]);
442 if (!SBC_ERROR_IS_OK(err)) {
443 goto done;
444 }
445 err = smbconf_add_string_to_array(tmp_service,
446 &(tmp_service->param_values),
447 count,
448 pd(ctx)->cache->param_values[sidx][count]);
449 if (!SBC_ERROR_IS_OK(err)) {
450 goto done;
451 }
452 }
453
454 tmp_service->num_params = count;
455 *service = talloc_move(mem_ctx, &tmp_service);
456
457done:
458 talloc_free(tmp_ctx);
459 return err;
460}
461
462/**
463 * delete a service from configuration
464 */
465static sbcErr smbconf_txt_delete_share(struct smbconf_ctx *ctx,
466 const char *servicename)
467{
468 return SBC_ERR_NOT_SUPPORTED;
469}
470
471/**
472 * set a configuration parameter to the value provided.
473 */
474static sbcErr smbconf_txt_set_parameter(struct smbconf_ctx *ctx,
475 const char *service,
476 const char *param,
477 const char *valstr)
478{
479 return SBC_ERR_NOT_SUPPORTED;
480}
481
482/**
483 * get the value of a configuration parameter as a string
484 */
485static sbcErr smbconf_txt_get_parameter(struct smbconf_ctx *ctx,
486 TALLOC_CTX *mem_ctx,
487 const char *service,
488 const char *param,
489 char **valstr)
490{
491 sbcErr err;
492 bool found;
493 uint32_t share_index, param_index;
494
495 err = smbconf_txt_load_file(ctx);
496 if (!SBC_ERROR_IS_OK(err)) {
497 return err;
498 }
499
500 found = smbconf_find_in_array(service,
501 pd(ctx)->cache->share_names,
502 pd(ctx)->cache->num_shares,
503 &share_index);
504 if (!found) {
505 return SBC_ERR_NO_SUCH_SERVICE;
506 }
507
508 found = smbconf_reverse_find_in_array(param,
509 pd(ctx)->cache->param_names[share_index],
510 pd(ctx)->cache->num_params[share_index],
511 &param_index);
512 if (!found) {
513 return SBC_ERR_INVALID_PARAM;
514 }
515
516 *valstr = talloc_strdup(mem_ctx,
517 pd(ctx)->cache->param_values[share_index][param_index]);
518
519 if (*valstr == NULL) {
520 return SBC_ERR_NOMEM;
521 }
522
523 return SBC_ERR_OK;
524}
525
526/**
527 * delete a parameter from configuration
528 */
529static sbcErr smbconf_txt_delete_parameter(struct smbconf_ctx *ctx,
530 const char *service,
531 const char *param)
532{
533 return SBC_ERR_NOT_SUPPORTED;
534}
535
536static sbcErr smbconf_txt_get_includes(struct smbconf_ctx *ctx,
537 TALLOC_CTX *mem_ctx,
538 const char *service,
539 uint32_t *num_includes,
540 char ***includes)
541{
542 sbcErr err;
543 bool found;
544 uint32_t sidx, count;
545 TALLOC_CTX *tmp_ctx = NULL;
546 uint32_t tmp_num_includes = 0;
547 char **tmp_includes = NULL;
548
549 err = smbconf_txt_load_file(ctx);
550 if (!SBC_ERROR_IS_OK(err)) {
551 return err;
552 }
553
554 found = smbconf_find_in_array(service,
555 pd(ctx)->cache->share_names,
556 pd(ctx)->cache->num_shares,
557 &sidx);
558 if (!found) {
559 return SBC_ERR_NO_SUCH_SERVICE;
560 }
561
562 tmp_ctx = talloc_stackframe();
563
564 for (count = 0; count < pd(ctx)->cache->num_params[sidx]; count++) {
565 if (strequal(pd(ctx)->cache->param_names[sidx][count],
566 "include"))
567 {
568 err = smbconf_add_string_to_array(tmp_ctx,
569 &tmp_includes,
570 tmp_num_includes,
571 pd(ctx)->cache->param_values[sidx][count]);
572 if (!SBC_ERROR_IS_OK(err)) {
573 goto done;
574 }
575 tmp_num_includes++;
576 }
577 }
578
579 *num_includes = tmp_num_includes;
580 if (*num_includes > 0) {
581 *includes = talloc_move(mem_ctx, &tmp_includes);
582 if (*includes == NULL) {
583 err = SBC_ERR_NOMEM;
584 goto done;
585 }
586 } else {
587 *includes = NULL;
588 }
589
590 err = SBC_ERR_OK;
591
592done:
593 talloc_free(tmp_ctx);
594 return err;
595}
596
597static sbcErr smbconf_txt_set_includes(struct smbconf_ctx *ctx,
598 const char *service,
599 uint32_t num_includes,
600 const char **includes)
601{
602 return SBC_ERR_NOT_SUPPORTED;
603}
604
605static sbcErr smbconf_txt_delete_includes(struct smbconf_ctx *ctx,
606 const char *service)
607{
608 return SBC_ERR_NOT_SUPPORTED;
609}
610
611static sbcErr smbconf_txt_transaction_start(struct smbconf_ctx *ctx)
612{
613 return SBC_ERR_OK;
614}
615
616static sbcErr smbconf_txt_transaction_commit(struct smbconf_ctx *ctx)
617{
618 return SBC_ERR_OK;
619}
620
621static sbcErr smbconf_txt_transaction_cancel(struct smbconf_ctx *ctx)
622{
623 return SBC_ERR_OK;
624}
625
626static struct smbconf_ops smbconf_ops_txt = {
627 .init = smbconf_txt_init,
628 .shutdown = smbconf_txt_shutdown,
629 .requires_messaging = smbconf_txt_requires_messaging,
630 .is_writeable = smbconf_txt_is_writeable,
631 .open_conf = smbconf_txt_open,
632 .close_conf = smbconf_txt_close,
633 .get_csn = smbconf_txt_get_csn,
634 .drop = smbconf_txt_drop,
635 .get_share_names = smbconf_txt_get_share_names,
636 .share_exists = smbconf_txt_share_exists,
637 .create_share = smbconf_txt_create_share,
638 .get_share = smbconf_txt_get_share,
639 .delete_share = smbconf_txt_delete_share,
640 .set_parameter = smbconf_txt_set_parameter,
641 .get_parameter = smbconf_txt_get_parameter,
642 .delete_parameter = smbconf_txt_delete_parameter,
643 .get_includes = smbconf_txt_get_includes,
644 .set_includes = smbconf_txt_set_includes,
645 .delete_includes = smbconf_txt_delete_includes,
646 .transaction_start = smbconf_txt_transaction_start,
647 .transaction_commit = smbconf_txt_transaction_commit,
648 .transaction_cancel = smbconf_txt_transaction_cancel,
649};
650
651
652/**
653 * initialize the smbconf text backend
654 * the only function that is exported from this module
655 */
656sbcErr smbconf_init_txt(TALLOC_CTX *mem_ctx,
657 struct smbconf_ctx **conf_ctx,
658 const char *path)
659{
660 sbcErr err;
661
662 err = smbconf_init_internal(mem_ctx, conf_ctx, path, &smbconf_ops_txt);
663 if (!SBC_ERROR_IS_OK(err)) {
664 return err;
665 }
666
667 return smbconf_txt_load_file(*conf_ctx);
668}
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