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af0818ef JR |
1 | /* |
2 | * Copyright (C) 2019 Jonathan Rajotte <jonathan.rajotte-julien@efficios.com> | |
3 | * | |
4 | * SPDX-License-Identifier: LGPL-2.1-only | |
5 | * | |
6 | */ | |
7 | ||
af0818ef JR |
8 | #include <common/credentials.h> |
9 | #include <common/error.h> | |
6a751b95 JR |
10 | #include <common/hashtable/hashtable.h> |
11 | #include <common/hashtable/utils.h> | |
af0818ef | 12 | #include <common/macros.h> |
6a751b95 | 13 | #include <common/mi-lttng.h> |
af0818ef | 14 | #include <common/optional.h> |
af0818ef | 15 | #include <common/payload-view.h> |
6a751b95 | 16 | #include <common/payload.h> |
af0818ef | 17 | #include <common/runas.h> |
af0818ef JR |
18 | #include <common/string-utils/string-utils.h> |
19 | #include <lttng/event-rule/event-rule-internal.h> | |
20 | #include <lttng/event-rule/kernel-tracepoint-internal.h> | |
21 | #include <lttng/event.h> | |
22 | ||
23 | #define IS_KERNEL_TRACEPOINT_EVENT_RULE(rule) \ | |
24 | (lttng_event_rule_get_type(rule) == LTTNG_EVENT_RULE_TYPE_KERNEL_TRACEPOINT) | |
25 | ||
26 | static void lttng_event_rule_kernel_tracepoint_destroy(struct lttng_event_rule *rule) | |
27 | { | |
28 | struct lttng_event_rule_kernel_tracepoint *tracepoint; | |
29 | ||
30 | if (rule == NULL) { | |
31 | return; | |
32 | } | |
33 | ||
34 | tracepoint = container_of( | |
35 | rule, struct lttng_event_rule_kernel_tracepoint, parent); | |
36 | ||
37 | free(tracepoint->pattern); | |
38 | free(tracepoint->filter_expression); | |
39 | free(tracepoint->internal_filter.filter); | |
40 | free(tracepoint->internal_filter.bytecode); | |
41 | free(tracepoint); | |
42 | } | |
43 | ||
44 | static bool lttng_event_rule_kernel_tracepoint_validate( | |
45 | const struct lttng_event_rule *rule) | |
46 | { | |
47 | bool valid = false; | |
48 | struct lttng_event_rule_kernel_tracepoint *tracepoint; | |
49 | ||
50 | if (!rule) { | |
51 | goto end; | |
52 | } | |
53 | ||
54 | tracepoint = container_of( | |
55 | rule, struct lttng_event_rule_kernel_tracepoint, parent); | |
56 | ||
57 | /* Required field. */ | |
58 | if (!tracepoint->pattern) { | |
59 | ERR("Invalid kernel tracepoint event rule: a pattern must be set."); | |
60 | goto end; | |
61 | } | |
62 | ||
63 | valid = true; | |
64 | end: | |
65 | return valid; | |
66 | } | |
67 | ||
68 | static int lttng_event_rule_kernel_tracepoint_serialize( | |
69 | const struct lttng_event_rule *rule, | |
70 | struct lttng_payload *payload) | |
71 | { | |
72 | int ret; | |
73 | size_t pattern_len, filter_expression_len; | |
74 | struct lttng_event_rule_kernel_tracepoint *tracepoint; | |
75 | struct lttng_event_rule_kernel_tracepoint_comm tracepoint_comm; | |
76 | ||
77 | if (!rule || !IS_KERNEL_TRACEPOINT_EVENT_RULE(rule)) { | |
78 | ret = -1; | |
79 | goto end; | |
80 | } | |
81 | ||
82 | DBG("Serializing kernel tracepoint event rule."); | |
83 | tracepoint = container_of( | |
84 | rule, struct lttng_event_rule_kernel_tracepoint, parent); | |
85 | ||
86 | pattern_len = strlen(tracepoint->pattern) + 1; | |
87 | ||
88 | if (tracepoint->filter_expression != NULL) { | |
89 | filter_expression_len = | |
90 | strlen(tracepoint->filter_expression) + 1; | |
91 | } else { | |
92 | filter_expression_len = 0; | |
93 | } | |
94 | ||
95 | tracepoint_comm.pattern_len = pattern_len; | |
96 | tracepoint_comm.filter_expression_len = filter_expression_len; | |
97 | ||
98 | ret = lttng_dynamic_buffer_append(&payload->buffer, &tracepoint_comm, | |
99 | sizeof(tracepoint_comm)); | |
100 | if (ret) { | |
101 | goto end; | |
102 | } | |
103 | ||
104 | ret = lttng_dynamic_buffer_append( | |
105 | &payload->buffer, tracepoint->pattern, pattern_len); | |
106 | if (ret) { | |
107 | goto end; | |
108 | } | |
109 | ||
110 | ret = lttng_dynamic_buffer_append(&payload->buffer, tracepoint->filter_expression, | |
111 | filter_expression_len); | |
112 | if (ret) { | |
113 | goto end; | |
114 | } | |
115 | ||
116 | end: | |
117 | return ret; | |
118 | } | |
119 | ||
120 | static bool lttng_event_rule_kernel_tracepoint_is_equal( | |
121 | const struct lttng_event_rule *_a, | |
122 | const struct lttng_event_rule *_b) | |
123 | { | |
124 | bool is_equal = false; | |
125 | struct lttng_event_rule_kernel_tracepoint *a, *b; | |
126 | ||
127 | a = container_of(_a, struct lttng_event_rule_kernel_tracepoint, parent); | |
128 | b = container_of(_b, struct lttng_event_rule_kernel_tracepoint, parent); | |
129 | ||
130 | if (!!a->filter_expression != !!b->filter_expression) { | |
131 | goto end; | |
132 | } | |
133 | ||
134 | /* Long check. */ | |
a0377dfe FD |
135 | LTTNG_ASSERT(a->pattern); |
136 | LTTNG_ASSERT(b->pattern); | |
af0818ef JR |
137 | if (strcmp(a->pattern, b->pattern)) { |
138 | goto end; | |
139 | } | |
140 | ||
141 | if (a->filter_expression && b->filter_expression) { | |
142 | if (strcmp(a->filter_expression, b->filter_expression)) { | |
143 | goto end; | |
144 | } | |
145 | } else if (!!a->filter_expression != !!b->filter_expression) { | |
146 | /* One is set; not the other. */ | |
147 | goto end; | |
148 | } | |
149 | ||
150 | is_equal = true; | |
151 | end: | |
152 | return is_equal; | |
153 | } | |
154 | ||
155 | static enum lttng_error_code | |
156 | lttng_event_rule_kernel_tracepoint_generate_filter_bytecode( | |
157 | struct lttng_event_rule *rule, | |
158 | const struct lttng_credentials *creds) | |
159 | { | |
160 | int ret; | |
161 | enum lttng_error_code ret_code; | |
162 | struct lttng_event_rule_kernel_tracepoint *tracepoint; | |
163 | enum lttng_event_rule_status status; | |
164 | const char *filter; | |
165 | struct lttng_bytecode *bytecode = NULL; | |
166 | ||
a0377dfe | 167 | LTTNG_ASSERT(rule); |
af0818ef JR |
168 | |
169 | tracepoint = container_of( | |
170 | rule, struct lttng_event_rule_kernel_tracepoint, parent); | |
171 | ||
172 | status = lttng_event_rule_kernel_tracepoint_get_filter(rule, &filter); | |
173 | if (status == LTTNG_EVENT_RULE_STATUS_UNSET) { | |
174 | filter = NULL; | |
175 | } else if (status != LTTNG_EVENT_RULE_STATUS_OK) { | |
176 | ret_code = LTTNG_ERR_FILTER_INVAL; | |
177 | goto end; | |
178 | } | |
179 | ||
180 | if (filter && filter[0] == '\0') { | |
181 | ret_code = LTTNG_ERR_FILTER_INVAL; | |
182 | goto error; | |
183 | } | |
184 | ||
185 | if (filter) { | |
186 | tracepoint->internal_filter.filter = strdup(filter); | |
187 | if (tracepoint->internal_filter.filter == NULL) { | |
188 | ret_code = LTTNG_ERR_NOMEM; | |
189 | goto error; | |
190 | } | |
191 | } else { | |
192 | tracepoint->internal_filter.filter = NULL; | |
193 | } | |
194 | ||
195 | if (tracepoint->internal_filter.filter == NULL) { | |
196 | ret_code = LTTNG_OK; | |
197 | goto end; | |
198 | } | |
199 | ||
200 | ret = run_as_generate_filter_bytecode( | |
201 | tracepoint->internal_filter.filter, creds, | |
202 | &bytecode); | |
203 | if (ret) { | |
204 | ret_code = LTTNG_ERR_FILTER_INVAL; | |
205 | goto end; | |
206 | } | |
207 | ||
208 | tracepoint->internal_filter.bytecode = bytecode; | |
209 | bytecode = NULL; | |
210 | ret_code = LTTNG_OK; | |
211 | ||
212 | error: | |
213 | end: | |
214 | free(bytecode); | |
215 | return ret_code; | |
216 | } | |
217 | ||
218 | static const char *lttng_event_rule_kernel_tracepoint_get_internal_filter( | |
219 | const struct lttng_event_rule *rule) | |
220 | { | |
221 | struct lttng_event_rule_kernel_tracepoint *tracepoint; | |
222 | ||
a0377dfe | 223 | LTTNG_ASSERT(rule); |
af0818ef JR |
224 | tracepoint = container_of( |
225 | rule, struct lttng_event_rule_kernel_tracepoint, parent); | |
226 | return tracepoint->internal_filter.filter; | |
227 | } | |
228 | ||
229 | static const struct lttng_bytecode * | |
230 | lttng_event_rule_kernel_tracepoint_get_internal_filter_bytecode( | |
231 | const struct lttng_event_rule *rule) | |
232 | { | |
233 | struct lttng_event_rule_kernel_tracepoint *tracepoint; | |
234 | ||
a0377dfe | 235 | LTTNG_ASSERT(rule); |
af0818ef JR |
236 | tracepoint = container_of( |
237 | rule, struct lttng_event_rule_kernel_tracepoint, parent); | |
238 | return tracepoint->internal_filter.bytecode; | |
239 | } | |
240 | ||
241 | static enum lttng_event_rule_generate_exclusions_status | |
242 | lttng_event_rule_kernel_tracepoint_generate_exclusions( | |
243 | const struct lttng_event_rule *rule, | |
244 | struct lttng_event_exclusion **_exclusions) | |
245 | { | |
246 | /* Unsupported. */ | |
247 | *_exclusions = NULL; | |
248 | return LTTNG_EVENT_RULE_GENERATE_EXCLUSIONS_STATUS_NONE; | |
249 | } | |
250 | ||
251 | static unsigned long lttng_event_rule_kernel_tracepoint_hash( | |
252 | const struct lttng_event_rule *rule) | |
253 | { | |
254 | unsigned long hash; | |
255 | struct lttng_event_rule_kernel_tracepoint *tp_rule = | |
256 | container_of(rule, typeof(*tp_rule), parent); | |
257 | ||
258 | hash = hash_key_ulong((void *) LTTNG_EVENT_RULE_TYPE_KERNEL_TRACEPOINT, | |
259 | lttng_ht_seed); | |
260 | hash ^= hash_key_str(tp_rule->pattern, lttng_ht_seed); | |
261 | ||
262 | if (tp_rule->filter_expression) { | |
263 | hash ^= hash_key_str(tp_rule->filter_expression, lttng_ht_seed); | |
264 | } | |
265 | ||
266 | return hash; | |
267 | } | |
268 | ||
6a751b95 JR |
269 | static enum lttng_error_code lttng_event_rule_kernel_tracepoint_mi_serialize( |
270 | const struct lttng_event_rule *rule, struct mi_writer *writer) | |
271 | { | |
272 | int ret; | |
273 | enum lttng_error_code ret_code; | |
274 | enum lttng_event_rule_status status; | |
275 | const char *filter = NULL; | |
276 | const char *name_pattern = NULL; | |
277 | ||
a0377dfe FD |
278 | LTTNG_ASSERT(rule); |
279 | LTTNG_ASSERT(writer); | |
280 | LTTNG_ASSERT(IS_KERNEL_TRACEPOINT_EVENT_RULE(rule)); | |
6a751b95 JR |
281 | |
282 | status = lttng_event_rule_kernel_tracepoint_get_name_pattern( | |
283 | rule, &name_pattern); | |
a0377dfe FD |
284 | LTTNG_ASSERT(status == LTTNG_EVENT_RULE_STATUS_OK); |
285 | LTTNG_ASSERT(name_pattern); | |
6a751b95 JR |
286 | |
287 | status = lttng_event_rule_kernel_tracepoint_get_filter(rule, &filter); | |
a0377dfe | 288 | LTTNG_ASSERT(status == LTTNG_EVENT_RULE_STATUS_OK || |
6a751b95 JR |
289 | status == LTTNG_EVENT_RULE_STATUS_UNSET); |
290 | ||
291 | /* Open event rule kernel tracepoint element. */ | |
292 | ret = mi_lttng_writer_open_element( | |
293 | writer, mi_lttng_element_event_rule_kernel_tracepoint); | |
294 | if (ret) { | |
295 | goto mi_error; | |
296 | } | |
297 | ||
298 | /* Name pattern. */ | |
299 | ret = mi_lttng_writer_write_element_string(writer, | |
300 | mi_lttng_element_event_rule_name_pattern, name_pattern); | |
301 | if (ret) { | |
302 | goto mi_error; | |
303 | } | |
304 | ||
305 | /* Filter. */ | |
306 | if (filter != NULL) { | |
307 | ret = mi_lttng_writer_write_element_string(writer, | |
308 | mi_lttng_element_event_rule_filter_expression, | |
309 | filter); | |
310 | if (ret) { | |
311 | goto mi_error; | |
312 | } | |
313 | } | |
314 | ||
315 | /* Close event rule kernel tracepoint element. */ | |
316 | ret = mi_lttng_writer_close_element(writer); | |
317 | if (ret) { | |
318 | goto mi_error; | |
319 | } | |
320 | ||
321 | ret_code = LTTNG_OK; | |
322 | goto end; | |
323 | ||
324 | mi_error: | |
325 | ret_code = LTTNG_ERR_MI_IO_FAIL; | |
326 | end: | |
327 | return ret_code; | |
328 | } | |
329 | ||
af0818ef JR |
330 | struct lttng_event_rule *lttng_event_rule_kernel_tracepoint_create(void) |
331 | { | |
332 | struct lttng_event_rule *rule = NULL; | |
333 | struct lttng_event_rule_kernel_tracepoint *tp_rule; | |
334 | enum lttng_event_rule_status status; | |
335 | ||
a6bc4ca9 | 336 | tp_rule = (lttng_event_rule_kernel_tracepoint *) zmalloc(sizeof(struct lttng_event_rule_kernel_tracepoint)); |
af0818ef JR |
337 | if (!tp_rule) { |
338 | goto end; | |
339 | } | |
340 | ||
341 | rule = &tp_rule->parent; | |
342 | lttng_event_rule_init(&tp_rule->parent, LTTNG_EVENT_RULE_TYPE_KERNEL_TRACEPOINT); | |
343 | tp_rule->parent.validate = lttng_event_rule_kernel_tracepoint_validate; | |
344 | tp_rule->parent.serialize = lttng_event_rule_kernel_tracepoint_serialize; | |
345 | tp_rule->parent.equal = lttng_event_rule_kernel_tracepoint_is_equal; | |
346 | tp_rule->parent.destroy = lttng_event_rule_kernel_tracepoint_destroy; | |
347 | tp_rule->parent.generate_filter_bytecode = | |
348 | lttng_event_rule_kernel_tracepoint_generate_filter_bytecode; | |
349 | tp_rule->parent.get_filter = | |
350 | lttng_event_rule_kernel_tracepoint_get_internal_filter; | |
351 | tp_rule->parent.get_filter_bytecode = | |
352 | lttng_event_rule_kernel_tracepoint_get_internal_filter_bytecode; | |
353 | tp_rule->parent.generate_exclusions = | |
354 | lttng_event_rule_kernel_tracepoint_generate_exclusions; | |
355 | tp_rule->parent.hash = lttng_event_rule_kernel_tracepoint_hash; | |
6a751b95 | 356 | tp_rule->parent.mi_serialize = lttng_event_rule_kernel_tracepoint_mi_serialize; |
af0818ef JR |
357 | |
358 | /* Not necessary for now. */ | |
359 | tp_rule->parent.generate_lttng_event = NULL; | |
360 | ||
361 | /* Default pattern is '*'. */ | |
362 | status = lttng_event_rule_kernel_tracepoint_set_name_pattern(rule, "*"); | |
363 | if (status != LTTNG_EVENT_RULE_STATUS_OK) { | |
364 | lttng_event_rule_destroy(rule); | |
365 | rule = NULL; | |
366 | } | |
367 | ||
368 | end: | |
369 | return rule; | |
370 | } | |
371 | ||
af0818ef JR |
372 | ssize_t lttng_event_rule_kernel_tracepoint_create_from_payload( |
373 | struct lttng_payload_view *view, | |
374 | struct lttng_event_rule **_event_rule) | |
375 | { | |
376 | ssize_t ret, offset = 0; | |
377 | enum lttng_event_rule_status status; | |
378 | const struct lttng_event_rule_kernel_tracepoint_comm *tracepoint_comm; | |
379 | const char *pattern; | |
380 | const char *filter_expression = NULL; | |
381 | struct lttng_buffer_view current_buffer_view; | |
382 | struct lttng_event_rule *rule = NULL; | |
383 | ||
384 | if (!_event_rule) { | |
385 | ret = -1; | |
386 | goto end; | |
387 | } | |
388 | ||
389 | current_buffer_view = lttng_buffer_view_from_view( | |
390 | &view->buffer, offset, sizeof(*tracepoint_comm)); | |
391 | if (!lttng_buffer_view_is_valid(¤t_buffer_view)) { | |
392 | ERR("Failed to initialize from malformed event rule kernel tracepoint: buffer too short to contain header."); | |
393 | ret = -1; | |
394 | goto end; | |
395 | } | |
396 | ||
397 | tracepoint_comm = (typeof(tracepoint_comm)) current_buffer_view.data; | |
398 | ||
399 | /* Skip to payload. */ | |
400 | offset += current_buffer_view.size; | |
401 | ||
402 | /* Map the pattern. */ | |
403 | current_buffer_view = lttng_buffer_view_from_view( | |
404 | &view->buffer, offset, tracepoint_comm->pattern_len); | |
405 | ||
406 | if (!lttng_buffer_view_is_valid(¤t_buffer_view)) { | |
407 | ret = -1; | |
408 | goto end; | |
409 | } | |
410 | ||
411 | pattern = current_buffer_view.data; | |
412 | if (!lttng_buffer_view_contains_string(¤t_buffer_view, pattern, | |
413 | tracepoint_comm->pattern_len)) { | |
414 | ret = -1; | |
415 | goto end; | |
416 | } | |
417 | ||
418 | /* Skip after the pattern. */ | |
419 | offset += tracepoint_comm->pattern_len; | |
420 | ||
421 | if (!tracepoint_comm->filter_expression_len) { | |
422 | goto skip_filter_expression; | |
423 | } | |
424 | ||
425 | /* Map the filter_expression. */ | |
426 | current_buffer_view = lttng_buffer_view_from_view(&view->buffer, offset, | |
427 | tracepoint_comm->filter_expression_len); | |
428 | if (!lttng_buffer_view_is_valid(¤t_buffer_view)) { | |
429 | ret = -1; | |
430 | goto end; | |
431 | } | |
432 | ||
433 | filter_expression = current_buffer_view.data; | |
434 | if (!lttng_buffer_view_contains_string(¤t_buffer_view, | |
435 | filter_expression, | |
436 | tracepoint_comm->filter_expression_len)) { | |
437 | ret = -1; | |
438 | goto end; | |
439 | } | |
440 | ||
441 | /* Skip after the pattern. */ | |
442 | offset += tracepoint_comm->filter_expression_len; | |
443 | ||
444 | skip_filter_expression: | |
445 | ||
446 | rule = lttng_event_rule_kernel_tracepoint_create(); | |
447 | if (!rule) { | |
448 | ERR("Failed to create event rule kernel tracepoint."); | |
449 | ret = -1; | |
450 | goto end; | |
451 | } | |
452 | ||
453 | status = lttng_event_rule_kernel_tracepoint_set_name_pattern(rule, pattern); | |
454 | if (status != LTTNG_EVENT_RULE_STATUS_OK) { | |
455 | ERR("Failed to set event rule kernel tracepoint pattern."); | |
456 | ret = -1; | |
457 | goto end; | |
458 | } | |
459 | ||
460 | if (filter_expression) { | |
461 | status = lttng_event_rule_kernel_tracepoint_set_filter( | |
462 | rule, filter_expression); | |
463 | if (status != LTTNG_EVENT_RULE_STATUS_OK) { | |
464 | ERR("Failed to set event rule kernel tracepoint pattern."); | |
465 | ret = -1; | |
466 | goto end; | |
467 | } | |
468 | } | |
469 | ||
470 | *_event_rule = rule; | |
471 | rule = NULL; | |
472 | ret = offset; | |
473 | end: | |
474 | lttng_event_rule_destroy(rule); | |
475 | return ret; | |
476 | } | |
477 | ||
478 | enum lttng_event_rule_status lttng_event_rule_kernel_tracepoint_set_name_pattern( | |
479 | struct lttng_event_rule *rule, const char *pattern) | |
480 | { | |
481 | char *pattern_copy = NULL; | |
482 | struct lttng_event_rule_kernel_tracepoint *tracepoint; | |
483 | enum lttng_event_rule_status status = LTTNG_EVENT_RULE_STATUS_OK; | |
484 | ||
485 | if (!rule || !IS_KERNEL_TRACEPOINT_EVENT_RULE(rule) || !pattern || | |
486 | strlen(pattern) == 0) { | |
487 | status = LTTNG_EVENT_RULE_STATUS_INVALID; | |
488 | goto end; | |
489 | } | |
490 | ||
491 | tracepoint = container_of( | |
492 | rule, struct lttng_event_rule_kernel_tracepoint, parent); | |
493 | pattern_copy = strdup(pattern); | |
494 | if (!pattern_copy) { | |
495 | status = LTTNG_EVENT_RULE_STATUS_ERROR; | |
496 | goto end; | |
497 | } | |
498 | ||
499 | /* Normalize the pattern. */ | |
500 | strutils_normalize_star_glob_pattern(pattern_copy); | |
501 | ||
502 | free(tracepoint->pattern); | |
503 | ||
504 | tracepoint->pattern = pattern_copy; | |
505 | pattern_copy = NULL; | |
506 | end: | |
507 | return status; | |
508 | } | |
509 | ||
510 | enum lttng_event_rule_status lttng_event_rule_kernel_tracepoint_get_name_pattern( | |
511 | const struct lttng_event_rule *rule, const char **pattern) | |
512 | { | |
513 | struct lttng_event_rule_kernel_tracepoint *tracepoint; | |
514 | enum lttng_event_rule_status status = LTTNG_EVENT_RULE_STATUS_OK; | |
515 | ||
516 | if (!rule || !IS_KERNEL_TRACEPOINT_EVENT_RULE(rule) || !pattern) { | |
517 | status = LTTNG_EVENT_RULE_STATUS_INVALID; | |
518 | goto end; | |
519 | } | |
520 | ||
521 | tracepoint = container_of( | |
522 | rule, struct lttng_event_rule_kernel_tracepoint, parent); | |
523 | if (!tracepoint->pattern) { | |
524 | status = LTTNG_EVENT_RULE_STATUS_UNSET; | |
525 | goto end; | |
526 | } | |
527 | ||
528 | *pattern = tracepoint->pattern; | |
529 | end: | |
530 | return status; | |
531 | } | |
532 | ||
533 | enum lttng_event_rule_status lttng_event_rule_kernel_tracepoint_set_filter( | |
534 | struct lttng_event_rule *rule, const char *expression) | |
535 | { | |
536 | char *expression_copy = NULL; | |
537 | struct lttng_event_rule_kernel_tracepoint *tracepoint; | |
538 | enum lttng_event_rule_status status = LTTNG_EVENT_RULE_STATUS_OK; | |
539 | ||
540 | if (!rule || !IS_KERNEL_TRACEPOINT_EVENT_RULE(rule) || !expression || | |
541 | strlen(expression) == 0) { | |
542 | status = LTTNG_EVENT_RULE_STATUS_INVALID; | |
543 | goto end; | |
544 | } | |
545 | ||
546 | tracepoint = container_of( | |
547 | rule, struct lttng_event_rule_kernel_tracepoint, parent); | |
548 | expression_copy = strdup(expression); | |
549 | if (!expression_copy) { | |
550 | PERROR("Failed to copy filter expression"); | |
551 | status = LTTNG_EVENT_RULE_STATUS_ERROR; | |
552 | goto end; | |
553 | } | |
554 | ||
555 | if (tracepoint->filter_expression) { | |
556 | free(tracepoint->filter_expression); | |
557 | } | |
558 | ||
559 | tracepoint->filter_expression = expression_copy; | |
560 | expression_copy = NULL; | |
561 | end: | |
562 | return status; | |
563 | } | |
564 | ||
565 | enum lttng_event_rule_status lttng_event_rule_kernel_tracepoint_get_filter( | |
566 | const struct lttng_event_rule *rule, const char **expression) | |
567 | { | |
568 | struct lttng_event_rule_kernel_tracepoint *tracepoint; | |
569 | enum lttng_event_rule_status status = LTTNG_EVENT_RULE_STATUS_OK; | |
570 | ||
571 | if (!rule || !IS_KERNEL_TRACEPOINT_EVENT_RULE(rule) || !expression) { | |
572 | status = LTTNG_EVENT_RULE_STATUS_INVALID; | |
573 | goto end; | |
574 | } | |
575 | ||
576 | tracepoint = container_of( | |
577 | rule, struct lttng_event_rule_kernel_tracepoint, parent); | |
578 | if (!tracepoint->filter_expression) { | |
579 | status = LTTNG_EVENT_RULE_STATUS_UNSET; | |
580 | goto end; | |
581 | } | |
582 | ||
583 | *expression = tracepoint->filter_expression; | |
584 | end: | |
585 | return status; | |
586 | } |