Commit | Line | Data |
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683d081a JR |
1 | /* |
2 | * Copyright (C) 2020 Jonathan Rajotte <jonathan.rajotte-julien@efficios.com> | |
3 | * | |
4 | * SPDX-License-Identifier: LGPL-2.1-only | |
5 | * | |
6 | */ | |
7 | ||
8 | #include <assert.h> | |
9 | #include <common/error.h> | |
10 | #include <common/macros.h> | |
38114013 | 11 | #include <inttypes.h> |
683d081a JR |
12 | #include <lttng/condition/condition-internal.h> |
13 | #include <lttng/condition/event-rule-internal.h> | |
14 | #include <lttng/condition/event-rule.h> | |
38114013 PP |
15 | #include <lttng/event-expr-internal.h> |
16 | #include <lttng/event-expr.h> | |
683d081a JR |
17 | #include <lttng/event-rule/event-rule-internal.h> |
18 | #include <stdbool.h> | |
38114013 | 19 | #include <stdint.h> |
683d081a JR |
20 | |
21 | #define IS_EVENT_RULE_CONDITION(condition) \ | |
22 | (lttng_condition_get_type(condition) == \ | |
23 | LTTNG_CONDITION_TYPE_EVENT_RULE_HIT) | |
24 | ||
25 | static bool is_event_rule_evaluation(const struct lttng_evaluation *evaluation) | |
26 | { | |
27 | enum lttng_condition_type type = lttng_evaluation_get_type(evaluation); | |
28 | ||
29 | return type == LTTNG_CONDITION_TYPE_EVENT_RULE_HIT; | |
30 | } | |
31 | ||
32 | static bool lttng_condition_event_rule_validate( | |
33 | const struct lttng_condition *condition); | |
34 | static int lttng_condition_event_rule_serialize( | |
35 | const struct lttng_condition *condition, | |
36 | struct lttng_payload *payload); | |
37 | static bool lttng_condition_event_rule_is_equal( | |
38 | const struct lttng_condition *_a, | |
39 | const struct lttng_condition *_b); | |
40 | static void lttng_condition_event_rule_destroy( | |
41 | struct lttng_condition *condition); | |
42 | ||
43 | static bool lttng_condition_event_rule_validate( | |
44 | const struct lttng_condition *condition) | |
45 | { | |
46 | bool valid = false; | |
47 | struct lttng_condition_event_rule *event_rule; | |
48 | ||
49 | if (!condition) { | |
50 | goto end; | |
51 | } | |
52 | ||
53 | event_rule = container_of( | |
54 | condition, struct lttng_condition_event_rule, parent); | |
55 | if (!event_rule->rule) { | |
56 | ERR("Invalid event rule condition: a rule must be set."); | |
57 | goto end; | |
58 | } | |
59 | ||
60 | valid = lttng_event_rule_validate(event_rule->rule); | |
61 | end: | |
62 | return valid; | |
63 | } | |
64 | ||
38114013 PP |
65 | /* |
66 | * Serializes the C string `str` into `buf`. | |
67 | * | |
68 | * Encoding is the length of `str` plus one (for the null character), | |
69 | * and then the string, including its null terminator. | |
70 | */ | |
71 | static | |
72 | int serialize_cstr(const char *str, struct lttng_dynamic_buffer *buf) | |
73 | { | |
74 | int ret; | |
75 | const uint32_t len = strlen(str) + 1; | |
76 | ||
77 | /* Serialize the length, including the null terminator. */ | |
78 | DBG("Serializing C string's length (including null terminator): " | |
79 | "%" PRIu32, len); | |
80 | ret = lttng_dynamic_buffer_append(buf, &len, sizeof(len)); | |
81 | if (ret) { | |
82 | goto end; | |
83 | } | |
84 | ||
85 | /* Serialize the string. */ | |
86 | DBG("Serializing C string: '%s'", str); | |
87 | ret = lttng_dynamic_buffer_append(buf, str, len); | |
88 | if (ret) { | |
89 | goto end; | |
90 | } | |
91 | ||
92 | end: | |
93 | return ret; | |
94 | } | |
95 | ||
96 | /* | |
97 | * Serializes the event expression `expr` into `buf`. | |
98 | */ | |
99 | static | |
100 | int serialize_event_expr(const struct lttng_event_expr *expr, | |
101 | struct lttng_payload *payload) | |
102 | { | |
103 | const uint8_t type = expr->type; | |
104 | int ret; | |
105 | ||
106 | /* Serialize the expression's type. */ | |
107 | DBG("Serializing event expression's type: %d", expr->type); | |
108 | ret = lttng_dynamic_buffer_append(&payload->buffer, &type, sizeof(type)); | |
109 | if (ret) { | |
110 | goto end; | |
111 | } | |
112 | ||
113 | /* Serialize the expression */ | |
114 | switch (expr->type) { | |
115 | case LTTNG_EVENT_EXPR_TYPE_EVENT_PAYLOAD_FIELD: | |
116 | case LTTNG_EVENT_EXPR_TYPE_CHANNEL_CONTEXT_FIELD: | |
117 | { | |
118 | const struct lttng_event_expr_field *field_expr = | |
119 | container_of(expr, | |
120 | const struct lttng_event_expr_field, | |
121 | parent); | |
122 | ||
123 | /* Serialize the field name. */ | |
124 | DBG("Serializing field event expression's field name: '%s'", | |
125 | field_expr->name); | |
126 | ret = serialize_cstr(field_expr->name, &payload->buffer); | |
127 | if (ret) { | |
128 | goto end; | |
129 | } | |
130 | ||
131 | break; | |
132 | } | |
133 | case LTTNG_EVENT_EXPR_TYPE_APP_SPECIFIC_CONTEXT_FIELD: | |
134 | { | |
135 | const struct lttng_event_expr_app_specific_context_field *field_expr = | |
136 | container_of(expr, | |
137 | const struct lttng_event_expr_app_specific_context_field, | |
138 | parent); | |
139 | ||
140 | /* Serialize the provider name. */ | |
141 | DBG("Serializing app-specific context field event expression's " | |
142 | "provider name: '%s'", | |
143 | field_expr->provider_name); | |
144 | ret = serialize_cstr(field_expr->provider_name, &payload->buffer); | |
145 | if (ret) { | |
146 | goto end; | |
147 | } | |
148 | ||
149 | /* Serialize the type name. */ | |
150 | DBG("Serializing app-specific context field event expression's " | |
151 | "type name: '%s'", | |
152 | field_expr->provider_name); | |
153 | ret = serialize_cstr(field_expr->type_name, &payload->buffer); | |
154 | if (ret) { | |
155 | goto end; | |
156 | } | |
157 | ||
158 | break; | |
159 | } | |
160 | case LTTNG_EVENT_EXPR_TYPE_ARRAY_FIELD_ELEMENT: | |
161 | { | |
162 | const struct lttng_event_expr_array_field_element *elem_expr = | |
163 | container_of(expr, | |
164 | const struct lttng_event_expr_array_field_element, | |
165 | parent); | |
166 | const uint32_t index = elem_expr->index; | |
167 | ||
168 | /* Serialize the index. */ | |
169 | DBG("Serializing array field element event expression's " | |
170 | "index: %u", elem_expr->index); | |
171 | ret = lttng_dynamic_buffer_append(&payload->buffer, &index, sizeof(index)); | |
172 | if (ret) { | |
173 | goto end; | |
174 | } | |
175 | ||
176 | /* Serialize the parent array field expression. */ | |
177 | DBG("Serializing array field element event expression's " | |
178 | "parent array field event expression."); | |
179 | ret = serialize_event_expr(elem_expr->array_field_expr, payload); | |
180 | if (ret) { | |
181 | goto end; | |
182 | } | |
183 | ||
184 | break; | |
185 | } | |
186 | default: | |
187 | break; | |
188 | } | |
189 | ||
190 | end: | |
191 | return ret; | |
192 | } | |
193 | ||
683d081a JR |
194 | static int lttng_condition_event_rule_serialize( |
195 | const struct lttng_condition *condition, | |
196 | struct lttng_payload *payload) | |
197 | { | |
198 | int ret; | |
683d081a | 199 | struct lttng_condition_event_rule *event_rule; |
38114013 PP |
200 | /* Used for iteration and communication (size matters). */ |
201 | uint32_t i, capture_descr_count; | |
683d081a JR |
202 | |
203 | if (!condition || !IS_EVENT_RULE_CONDITION(condition)) { | |
204 | ret = -1; | |
205 | goto end; | |
206 | } | |
207 | ||
208 | DBG("Serializing event rule condition"); | |
209 | event_rule = container_of( | |
210 | condition, struct lttng_condition_event_rule, parent); | |
211 | ||
38114013 PP |
212 | DBG("Serializing event rule condition's event rule"); |
213 | ret = lttng_event_rule_serialize(event_rule->rule, payload); | |
683d081a JR |
214 | if (ret) { |
215 | goto end; | |
216 | } | |
217 | ||
38114013 PP |
218 | capture_descr_count = lttng_dynamic_pointer_array_get_count( |
219 | &event_rule->capture_descriptors); | |
220 | DBG("Serializing event rule condition's capture descriptor count: %" PRIu32, | |
221 | capture_descr_count); | |
222 | ret = lttng_dynamic_buffer_append(&payload->buffer, &capture_descr_count, | |
223 | sizeof(capture_descr_count)); | |
683d081a JR |
224 | if (ret) { |
225 | goto end; | |
226 | } | |
227 | ||
38114013 PP |
228 | for (i = 0; i < capture_descr_count; i++) { |
229 | const struct lttng_event_expr *expr = | |
230 | lttng_dynamic_pointer_array_get_pointer( | |
231 | &event_rule->capture_descriptors, i); | |
232 | ||
233 | DBG("Serializing event rule condition's capture descriptor %" PRIu32, | |
234 | i); | |
235 | ret = serialize_event_expr(expr, payload); | |
236 | if (ret) { | |
237 | goto end; | |
238 | } | |
239 | } | |
683d081a JR |
240 | |
241 | end: | |
242 | return ret; | |
243 | } | |
244 | ||
38114013 PP |
245 | static |
246 | bool capture_descriptors_are_equal( | |
247 | const struct lttng_condition_event_rule *condition_a, | |
248 | const struct lttng_condition_event_rule *condition_b) | |
249 | { | |
250 | bool is_equal = true; | |
251 | size_t capture_descr_count_a; | |
252 | size_t capture_descr_count_b; | |
253 | size_t i; | |
254 | ||
255 | capture_descr_count_a = lttng_dynamic_pointer_array_get_count( | |
256 | &condition_a->capture_descriptors); | |
257 | capture_descr_count_b = lttng_dynamic_pointer_array_get_count( | |
258 | &condition_b->capture_descriptors); | |
259 | ||
260 | if (capture_descr_count_a != capture_descr_count_b) { | |
261 | goto not_equal; | |
262 | } | |
263 | ||
264 | for (i = 0; i < capture_descr_count_a; i++) { | |
265 | const struct lttng_event_expr *expr_a = | |
266 | lttng_dynamic_pointer_array_get_pointer( | |
267 | &condition_a->capture_descriptors, | |
268 | i); | |
269 | const struct lttng_event_expr *expr_b = | |
270 | lttng_dynamic_pointer_array_get_pointer( | |
271 | &condition_b->capture_descriptors, | |
272 | i); | |
273 | ||
274 | if (!lttng_event_expr_is_equal(expr_a, expr_b)) { | |
275 | goto not_equal; | |
276 | } | |
277 | } | |
278 | ||
279 | goto end; | |
280 | ||
281 | not_equal: | |
282 | is_equal = false; | |
283 | ||
284 | end: | |
285 | return is_equal; | |
286 | } | |
287 | ||
683d081a JR |
288 | static bool lttng_condition_event_rule_is_equal( |
289 | const struct lttng_condition *_a, | |
290 | const struct lttng_condition *_b) | |
291 | { | |
292 | bool is_equal = false; | |
293 | struct lttng_condition_event_rule *a, *b; | |
294 | ||
295 | a = container_of(_a, struct lttng_condition_event_rule, parent); | |
296 | b = container_of(_b, struct lttng_condition_event_rule, parent); | |
297 | ||
298 | /* Both event rules must be set or both must be unset. */ | |
299 | if ((a->rule && !b->rule) || (!a->rule && b->rule)) { | |
300 | WARN("Comparing event_rule conditions with uninitialized rule"); | |
301 | goto end; | |
302 | } | |
303 | ||
304 | is_equal = lttng_event_rule_is_equal(a->rule, b->rule); | |
38114013 PP |
305 | if (!is_equal) { |
306 | goto end; | |
307 | } | |
308 | ||
309 | is_equal = capture_descriptors_are_equal(a, b); | |
310 | ||
683d081a JR |
311 | end: |
312 | return is_equal; | |
313 | } | |
314 | ||
315 | static void lttng_condition_event_rule_destroy( | |
316 | struct lttng_condition *condition) | |
317 | { | |
318 | struct lttng_condition_event_rule *event_rule; | |
319 | ||
320 | event_rule = container_of( | |
321 | condition, struct lttng_condition_event_rule, parent); | |
322 | ||
323 | lttng_event_rule_put(event_rule->rule); | |
38114013 | 324 | lttng_dynamic_pointer_array_reset(&event_rule->capture_descriptors); |
683d081a JR |
325 | free(event_rule); |
326 | } | |
327 | ||
38114013 PP |
328 | static |
329 | void destroy_event_expr(void *ptr) | |
330 | { | |
331 | lttng_event_expr_destroy(ptr); | |
332 | } | |
333 | ||
683d081a JR |
334 | struct lttng_condition *lttng_condition_event_rule_create( |
335 | struct lttng_event_rule *rule) | |
336 | { | |
337 | struct lttng_condition *parent = NULL; | |
338 | struct lttng_condition_event_rule *condition = NULL; | |
339 | ||
340 | if (!rule) { | |
341 | goto end; | |
342 | } | |
343 | ||
344 | condition = zmalloc(sizeof(struct lttng_condition_event_rule)); | |
345 | if (!condition) { | |
346 | return NULL; | |
347 | } | |
348 | ||
349 | lttng_condition_init(&condition->parent, | |
350 | LTTNG_CONDITION_TYPE_EVENT_RULE_HIT); | |
351 | condition->parent.validate = lttng_condition_event_rule_validate, | |
352 | condition->parent.serialize = lttng_condition_event_rule_serialize, | |
353 | condition->parent.equal = lttng_condition_event_rule_is_equal, | |
354 | condition->parent.destroy = lttng_condition_event_rule_destroy, | |
355 | ||
356 | lttng_event_rule_get(rule); | |
357 | condition->rule = rule; | |
358 | rule = NULL; | |
359 | ||
38114013 PP |
360 | lttng_dynamic_pointer_array_init(&condition->capture_descriptors, |
361 | destroy_event_expr); | |
362 | ||
683d081a JR |
363 | parent = &condition->parent; |
364 | end: | |
365 | return parent; | |
366 | } | |
367 | ||
38114013 PP |
368 | static |
369 | uint64_t uint_from_buffer(const struct lttng_buffer_view *view, size_t size, | |
370 | size_t *offset) | |
371 | { | |
372 | uint64_t ret; | |
373 | const struct lttng_buffer_view uint_view = | |
374 | lttng_buffer_view_from_view(view, *offset, size); | |
375 | ||
376 | if (!lttng_buffer_view_is_valid(&uint_view)) { | |
377 | ret = UINT64_C(-1); | |
378 | goto end; | |
379 | } | |
380 | ||
381 | switch (size) { | |
382 | case 1: | |
383 | ret = (uint64_t) *uint_view.data; | |
384 | break; | |
385 | case sizeof(uint32_t): | |
386 | { | |
387 | uint32_t u32; | |
388 | ||
389 | memcpy(&u32, uint_view.data, sizeof(u32)); | |
390 | ret = (uint64_t) u32; | |
391 | break; | |
392 | } | |
393 | case sizeof(ret): | |
394 | memcpy(&ret, uint_view.data, sizeof(ret)); | |
395 | break; | |
396 | default: | |
397 | abort(); | |
398 | } | |
399 | ||
400 | *offset += size; | |
401 | ||
402 | end: | |
403 | return ret; | |
404 | } | |
405 | ||
406 | static | |
407 | const char *str_from_buffer(const struct lttng_buffer_view *view, | |
408 | size_t *offset) | |
409 | { | |
410 | uint64_t len; | |
411 | const char *ret; | |
412 | ||
413 | len = uint_from_buffer(view, sizeof(uint32_t), offset); | |
414 | if (len == UINT64_C(-1)) { | |
415 | goto error; | |
416 | } | |
417 | ||
418 | ret = &view->data[*offset]; | |
419 | ||
420 | if (!lttng_buffer_view_contains_string(view, ret, len)) { | |
421 | goto error; | |
422 | } | |
423 | ||
424 | *offset += len; | |
425 | goto end; | |
426 | ||
427 | error: | |
428 | ret = NULL; | |
429 | ||
430 | end: | |
431 | return ret; | |
432 | } | |
433 | ||
434 | static | |
435 | struct lttng_event_expr *event_expr_from_payload( | |
436 | struct lttng_payload_view *view, size_t *offset) | |
437 | { | |
438 | struct lttng_event_expr *expr = NULL; | |
439 | const char *str; | |
440 | uint64_t type; | |
441 | ||
442 | type = uint_from_buffer(&view->buffer, sizeof(uint8_t), offset); | |
443 | if (type == UINT64_C(-1)) { | |
444 | goto error; | |
445 | } | |
446 | ||
447 | switch (type) { | |
448 | case LTTNG_EVENT_EXPR_TYPE_EVENT_PAYLOAD_FIELD: | |
449 | str = str_from_buffer(&view->buffer, offset); | |
450 | if (!str) { | |
451 | goto error; | |
452 | } | |
453 | ||
454 | expr = lttng_event_expr_event_payload_field_create(str); | |
455 | break; | |
456 | case LTTNG_EVENT_EXPR_TYPE_CHANNEL_CONTEXT_FIELD: | |
457 | str = str_from_buffer(&view->buffer, offset); | |
458 | if (!str) { | |
459 | goto error; | |
460 | } | |
461 | ||
462 | expr = lttng_event_expr_channel_context_field_create(str); | |
463 | break; | |
464 | case LTTNG_EVENT_EXPR_TYPE_APP_SPECIFIC_CONTEXT_FIELD: | |
465 | { | |
466 | const char *provider_name; | |
467 | const char *type_name; | |
468 | ||
469 | provider_name = str_from_buffer(&view->buffer, offset); | |
470 | if (!provider_name) { | |
471 | goto error; | |
472 | } | |
473 | ||
474 | type_name = str_from_buffer(&view->buffer, offset); | |
475 | if (!type_name) { | |
476 | goto error; | |
477 | } | |
478 | ||
479 | expr = lttng_event_expr_app_specific_context_field_create( | |
480 | provider_name, type_name); | |
481 | break; | |
482 | } | |
483 | case LTTNG_EVENT_EXPR_TYPE_ARRAY_FIELD_ELEMENT: | |
484 | { | |
485 | struct lttng_event_expr *array_field_expr; | |
486 | const uint64_t index = uint_from_buffer( | |
487 | &view->buffer, sizeof(uint32_t), offset); | |
488 | ||
489 | if (index == UINT64_C(-1)) { | |
490 | goto error; | |
491 | } | |
492 | ||
493 | /* Array field expression is the encoded after this. */ | |
494 | array_field_expr = event_expr_from_payload(view, offset); | |
495 | if (!array_field_expr) { | |
496 | goto error; | |
497 | } | |
498 | ||
499 | /* Move ownership of `array_field_expr` to new expression. */ | |
500 | expr = lttng_event_expr_array_field_element_create( | |
501 | array_field_expr, (unsigned int) index); | |
502 | if (!expr) { | |
503 | /* `array_field_expr` not moved: destroy it. */ | |
504 | lttng_event_expr_destroy(array_field_expr); | |
505 | } | |
506 | ||
507 | break; | |
508 | } | |
509 | default: | |
510 | abort(); | |
511 | } | |
512 | ||
513 | goto end; | |
514 | ||
515 | error: | |
516 | lttng_event_expr_destroy(expr); | |
517 | expr = NULL; | |
518 | ||
519 | end: | |
520 | return expr; | |
521 | } | |
522 | ||
683d081a JR |
523 | LTTNG_HIDDEN |
524 | ssize_t lttng_condition_event_rule_create_from_payload( | |
525 | struct lttng_payload_view *view, | |
526 | struct lttng_condition **_condition) | |
527 | { | |
38114013 PP |
528 | ssize_t consumed_length; |
529 | size_t offset = 0; | |
530 | ssize_t event_rule_length; | |
531 | uint32_t i, capture_descr_count; | |
683d081a JR |
532 | struct lttng_condition *condition = NULL; |
533 | struct lttng_event_rule *event_rule = NULL; | |
683d081a JR |
534 | |
535 | if (!view || !_condition) { | |
536 | goto error; | |
537 | } | |
538 | ||
38114013 | 539 | /* Struct lttng_event_rule. */ |
683d081a JR |
540 | { |
541 | struct lttng_payload_view event_rule_view = | |
542 | lttng_payload_view_from_view(view, offset, -1); | |
543 | ||
544 | event_rule_length = lttng_event_rule_create_from_payload( | |
545 | &event_rule_view, &event_rule); | |
546 | } | |
547 | ||
548 | if (event_rule_length < 0 || !event_rule) { | |
549 | goto error; | |
550 | } | |
551 | ||
38114013 PP |
552 | /* Create condition (no capture descriptors yet) at this point. */ |
553 | condition = lttng_condition_event_rule_create(event_rule); | |
554 | if (!condition) { | |
683d081a JR |
555 | goto error; |
556 | } | |
557 | ||
683d081a | 558 | |
38114013 PP |
559 | /* Capture descriptor count. */ |
560 | assert(event_rule_length >= 0); | |
561 | offset += (size_t) event_rule_length; | |
562 | capture_descr_count = uint_from_buffer(&view->buffer, sizeof(uint32_t), &offset); | |
563 | if (capture_descr_count == UINT32_C(-1)) { | |
683d081a JR |
564 | goto error; |
565 | } | |
566 | ||
38114013 PP |
567 | /* Capture descriptors. */ |
568 | for (i = 0; i < capture_descr_count; i++) { | |
569 | struct lttng_event_expr *expr = event_expr_from_payload( | |
570 | view, &offset); | |
571 | enum lttng_condition_status status; | |
572 | ||
573 | if (!expr) { | |
574 | goto error; | |
575 | } | |
576 | ||
577 | /* Move ownership of `expr` to `condition`. */ | |
578 | status = lttng_condition_event_rule_append_capture_descriptor( | |
579 | condition, expr); | |
580 | if (status != LTTNG_CONDITION_STATUS_OK) { | |
581 | /* `expr` not moved: destroy it. */ | |
582 | lttng_event_expr_destroy(expr); | |
583 | goto error; | |
584 | } | |
585 | } | |
586 | ||
587 | consumed_length = (ssize_t) offset; | |
683d081a JR |
588 | *_condition = condition; |
589 | condition = NULL; | |
590 | goto end; | |
591 | ||
592 | error: | |
38114013 | 593 | consumed_length = -1; |
683d081a JR |
594 | |
595 | end: | |
596 | lttng_event_rule_put(event_rule); | |
597 | lttng_condition_put(condition); | |
38114013 | 598 | return consumed_length; |
683d081a JR |
599 | } |
600 | ||
601 | LTTNG_HIDDEN | |
602 | enum lttng_condition_status lttng_condition_event_rule_borrow_rule_mutable( | |
603 | const struct lttng_condition *condition, | |
604 | struct lttng_event_rule **rule) | |
605 | { | |
606 | struct lttng_condition_event_rule *event_rule; | |
607 | enum lttng_condition_status status = LTTNG_CONDITION_STATUS_OK; | |
608 | ||
609 | if (!condition || !IS_EVENT_RULE_CONDITION(condition) || !rule) { | |
610 | status = LTTNG_CONDITION_STATUS_INVALID; | |
611 | goto end; | |
612 | } | |
613 | ||
614 | event_rule = container_of( | |
615 | condition, struct lttng_condition_event_rule, parent); | |
616 | if (!event_rule->rule) { | |
617 | status = LTTNG_CONDITION_STATUS_UNSET; | |
618 | goto end; | |
619 | } | |
620 | ||
621 | *rule = event_rule->rule; | |
622 | end: | |
623 | return status; | |
624 | } | |
625 | ||
626 | enum lttng_condition_status lttng_condition_event_rule_get_rule( | |
627 | const struct lttng_condition *condition, | |
628 | const struct lttng_event_rule **rule) | |
629 | { | |
630 | struct lttng_event_rule *mutable_rule = NULL; | |
631 | const enum lttng_condition_status status = | |
632 | lttng_condition_event_rule_borrow_rule_mutable( | |
633 | condition, &mutable_rule); | |
634 | ||
635 | *rule = mutable_rule; | |
636 | return status; | |
637 | } | |
638 | ||
38114013 PP |
639 | enum lttng_condition_status |
640 | lttng_condition_event_rule_append_capture_descriptor( | |
641 | struct lttng_condition *condition, | |
642 | struct lttng_event_expr *expr) | |
643 | { | |
644 | int ret; | |
645 | enum lttng_condition_status status = LTTNG_CONDITION_STATUS_OK; | |
646 | struct lttng_condition_event_rule *event_rule_cond = | |
647 | container_of(condition, | |
648 | struct lttng_condition_event_rule, parent); | |
649 | ||
650 | /* Only accept l-values. */ | |
651 | if (!condition || !IS_EVENT_RULE_CONDITION(condition) || !expr || | |
652 | !lttng_event_expr_is_lvalue(expr)) { | |
653 | status = LTTNG_CONDITION_STATUS_INVALID; | |
654 | goto end; | |
655 | } | |
656 | ||
657 | ret = lttng_dynamic_pointer_array_add_pointer( | |
658 | &event_rule_cond->capture_descriptors, expr); | |
659 | if (ret) { | |
660 | status = LTTNG_CONDITION_STATUS_ERROR; | |
661 | goto end; | |
662 | } | |
663 | ||
664 | end: | |
665 | return status; | |
666 | } | |
667 | ||
668 | enum lttng_condition_status | |
669 | lttng_condition_event_rule_get_capture_descriptor_count( | |
670 | const struct lttng_condition *condition, unsigned int *count) | |
671 | { | |
672 | enum lttng_condition_status status = LTTNG_CONDITION_STATUS_OK; | |
673 | const struct lttng_condition_event_rule *event_rule_cond = | |
674 | container_of(condition, | |
675 | const struct lttng_condition_event_rule, | |
676 | parent); | |
677 | ||
678 | if (!condition || !IS_EVENT_RULE_CONDITION(condition) || !count) { | |
679 | status = LTTNG_CONDITION_STATUS_INVALID; | |
680 | goto end; | |
681 | } | |
682 | ||
683 | *count = lttng_dynamic_pointer_array_get_count( | |
684 | &event_rule_cond->capture_descriptors); | |
685 | ||
686 | end: | |
687 | return status; | |
688 | } | |
689 | ||
690 | const struct lttng_event_expr * | |
691 | lttng_condition_event_rule_get_capture_descriptor_at_index( | |
692 | const struct lttng_condition *condition, unsigned int index) | |
693 | { | |
694 | const struct lttng_condition_event_rule *event_rule_cond = | |
695 | container_of(condition, | |
696 | const struct lttng_condition_event_rule, | |
697 | parent); | |
698 | const struct lttng_event_expr *expr = NULL; | |
699 | ||
700 | if (!condition || !IS_EVENT_RULE_CONDITION(condition) || | |
701 | index >= lttng_dynamic_pointer_array_get_count( | |
702 | &event_rule_cond->capture_descriptors)) { | |
703 | goto end; | |
704 | } | |
705 | ||
706 | expr = lttng_dynamic_pointer_array_get_pointer( | |
707 | &event_rule_cond->capture_descriptors, index); | |
708 | ||
709 | end: | |
710 | return expr; | |
711 | } | |
712 | ||
683d081a JR |
713 | LTTNG_HIDDEN |
714 | ssize_t lttng_evaluation_event_rule_create_from_payload( | |
715 | struct lttng_payload_view *view, | |
716 | struct lttng_evaluation **_evaluation) | |
717 | { | |
718 | ssize_t ret, offset = 0; | |
719 | const char *trigger_name; | |
720 | struct lttng_evaluation *evaluation = NULL; | |
721 | const struct lttng_evaluation_event_rule_comm *header; | |
722 | const struct lttng_payload_view header_view = | |
723 | lttng_payload_view_from_view( | |
724 | view, 0, sizeof(*header)); | |
725 | ||
726 | if (!_evaluation) { | |
727 | ret = -1; | |
728 | goto error; | |
729 | } | |
730 | ||
731 | if (!lttng_payload_view_is_valid(&header_view)) { | |
732 | ERR("Failed to initialize from malformed event rule evaluation: buffer too short to contain header"); | |
733 | ret = -1; | |
734 | goto error; | |
735 | } | |
736 | ||
737 | header = (typeof(header)) header_view.buffer.data; | |
738 | ||
739 | /* Map the originating trigger's name. */ | |
740 | offset += sizeof(*header); | |
741 | { | |
742 | struct lttng_payload_view current_view = | |
743 | lttng_payload_view_from_view(view, offset, | |
744 | header->trigger_name_length); | |
745 | ||
746 | if (!lttng_payload_view_is_valid(¤t_view)) { | |
747 | ERR("Failed to initialize from malformed event rule evaluation: buffer too short to contain trigger name"); | |
748 | ret = -1; | |
749 | goto error; | |
750 | } | |
751 | ||
752 | trigger_name = current_view.buffer.data; | |
753 | if (!lttng_buffer_view_contains_string(¤t_view.buffer, | |
754 | trigger_name, header->trigger_name_length)) { | |
755 | ERR("Failed to initialize from malformed event rule evaluation: invalid trigger name"); | |
756 | ret = -1; | |
757 | goto error; | |
758 | } | |
759 | } | |
760 | ||
761 | offset += header->trigger_name_length; | |
762 | ||
763 | evaluation = lttng_evaluation_event_rule_create(trigger_name); | |
764 | if (!evaluation) { | |
765 | ret = -1; | |
766 | goto error; | |
767 | } | |
768 | ||
769 | *_evaluation = evaluation; | |
770 | evaluation = NULL; | |
771 | ret = offset; | |
772 | ||
773 | error: | |
774 | lttng_evaluation_destroy(evaluation); | |
775 | return ret; | |
776 | } | |
777 | ||
778 | static int lttng_evaluation_event_rule_serialize( | |
779 | const struct lttng_evaluation *evaluation, | |
780 | struct lttng_payload *payload) | |
781 | { | |
782 | int ret = 0; | |
783 | struct lttng_evaluation_event_rule *hit; | |
784 | struct lttng_evaluation_event_rule_comm comm; | |
785 | ||
786 | hit = container_of( | |
787 | evaluation, struct lttng_evaluation_event_rule, parent); | |
788 | ||
789 | assert(hit->name); | |
790 | comm.trigger_name_length = strlen(hit->name) + 1; | |
791 | ||
792 | ret = lttng_dynamic_buffer_append( | |
793 | &payload->buffer, &comm, sizeof(comm)); | |
794 | if (ret) { | |
795 | goto end; | |
796 | } | |
797 | ||
798 | ret = lttng_dynamic_buffer_append( | |
799 | &payload->buffer, hit->name, comm.trigger_name_length); | |
800 | end: | |
801 | return ret; | |
802 | } | |
803 | ||
804 | static void lttng_evaluation_event_rule_destroy( | |
805 | struct lttng_evaluation *evaluation) | |
806 | { | |
807 | struct lttng_evaluation_event_rule *hit; | |
808 | ||
809 | hit = container_of( | |
810 | evaluation, struct lttng_evaluation_event_rule, parent); | |
811 | free(hit->name); | |
812 | free(hit); | |
813 | } | |
814 | ||
815 | LTTNG_HIDDEN | |
816 | struct lttng_evaluation *lttng_evaluation_event_rule_create( | |
817 | const char *trigger_name) | |
818 | { | |
819 | struct lttng_evaluation_event_rule *hit; | |
820 | struct lttng_evaluation *evaluation = NULL; | |
821 | ||
822 | hit = zmalloc(sizeof(struct lttng_evaluation_event_rule)); | |
823 | if (!hit) { | |
824 | goto end; | |
825 | } | |
826 | ||
827 | hit->name = strdup(trigger_name); | |
828 | if (!hit->name) { | |
829 | goto end; | |
830 | } | |
831 | ||
832 | hit->parent.type = LTTNG_CONDITION_TYPE_EVENT_RULE_HIT; | |
833 | hit->parent.serialize = lttng_evaluation_event_rule_serialize; | |
834 | hit->parent.destroy = lttng_evaluation_event_rule_destroy; | |
835 | ||
836 | evaluation = &hit->parent; | |
837 | hit = NULL; | |
838 | ||
839 | end: | |
840 | if (hit) { | |
841 | lttng_evaluation_event_rule_destroy(&hit->parent); | |
842 | } | |
843 | ||
844 | return evaluation; | |
845 | } | |
846 | ||
847 | enum lttng_evaluation_status lttng_evaluation_event_rule_get_trigger_name( | |
848 | const struct lttng_evaluation *evaluation, const char **name) | |
849 | { | |
850 | struct lttng_evaluation_event_rule *hit; | |
851 | enum lttng_evaluation_status status = LTTNG_EVALUATION_STATUS_OK; | |
852 | ||
853 | if (!evaluation || !is_event_rule_evaluation(evaluation) || !name) { | |
854 | status = LTTNG_EVALUATION_STATUS_INVALID; | |
855 | goto end; | |
856 | } | |
857 | ||
858 | hit = container_of( | |
859 | evaluation, struct lttng_evaluation_event_rule, parent); | |
860 | *name = hit->name; | |
861 | end: | |
862 | return status; | |
863 | } |