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> |
116a02e3 | 20 | #include <vendor/msgpack/msgpack.h> |
683d081a JR |
21 | |
22 | #define IS_EVENT_RULE_CONDITION(condition) \ | |
23 | (lttng_condition_get_type(condition) == \ | |
24 | LTTNG_CONDITION_TYPE_EVENT_RULE_HIT) | |
25 | ||
26 | static bool is_event_rule_evaluation(const struct lttng_evaluation *evaluation) | |
27 | { | |
28 | enum lttng_condition_type type = lttng_evaluation_get_type(evaluation); | |
29 | ||
30 | return type == LTTNG_CONDITION_TYPE_EVENT_RULE_HIT; | |
31 | } | |
32 | ||
33 | static bool lttng_condition_event_rule_validate( | |
34 | const struct lttng_condition *condition); | |
35 | static int lttng_condition_event_rule_serialize( | |
36 | const struct lttng_condition *condition, | |
37 | struct lttng_payload *payload); | |
38 | static bool lttng_condition_event_rule_is_equal( | |
39 | const struct lttng_condition *_a, | |
40 | const struct lttng_condition *_b); | |
41 | static void lttng_condition_event_rule_destroy( | |
42 | struct lttng_condition *condition); | |
43 | ||
44 | static bool lttng_condition_event_rule_validate( | |
45 | const struct lttng_condition *condition) | |
46 | { | |
47 | bool valid = false; | |
48 | struct lttng_condition_event_rule *event_rule; | |
49 | ||
50 | if (!condition) { | |
51 | goto end; | |
52 | } | |
53 | ||
54 | event_rule = container_of( | |
55 | condition, struct lttng_condition_event_rule, parent); | |
56 | if (!event_rule->rule) { | |
57 | ERR("Invalid event rule condition: a rule must be set."); | |
58 | goto end; | |
59 | } | |
60 | ||
61 | valid = lttng_event_rule_validate(event_rule->rule); | |
62 | end: | |
63 | return valid; | |
64 | } | |
65 | ||
38114013 PP |
66 | /* |
67 | * Serializes the C string `str` into `buf`. | |
68 | * | |
69 | * Encoding is the length of `str` plus one (for the null character), | |
70 | * and then the string, including its null terminator. | |
71 | */ | |
72 | static | |
73 | int serialize_cstr(const char *str, struct lttng_dynamic_buffer *buf) | |
74 | { | |
75 | int ret; | |
76 | const uint32_t len = strlen(str) + 1; | |
77 | ||
78 | /* Serialize the length, including the null terminator. */ | |
79 | DBG("Serializing C string's length (including null terminator): " | |
80 | "%" PRIu32, len); | |
81 | ret = lttng_dynamic_buffer_append(buf, &len, sizeof(len)); | |
82 | if (ret) { | |
83 | goto end; | |
84 | } | |
85 | ||
86 | /* Serialize the string. */ | |
87 | DBG("Serializing C string: '%s'", str); | |
88 | ret = lttng_dynamic_buffer_append(buf, str, len); | |
89 | if (ret) { | |
90 | goto end; | |
91 | } | |
92 | ||
93 | end: | |
94 | return ret; | |
95 | } | |
96 | ||
97 | /* | |
98 | * Serializes the event expression `expr` into `buf`. | |
99 | */ | |
100 | static | |
101 | int serialize_event_expr(const struct lttng_event_expr *expr, | |
102 | struct lttng_payload *payload) | |
103 | { | |
104 | const uint8_t type = expr->type; | |
105 | int ret; | |
106 | ||
107 | /* Serialize the expression's type. */ | |
108 | DBG("Serializing event expression's type: %d", expr->type); | |
109 | ret = lttng_dynamic_buffer_append(&payload->buffer, &type, sizeof(type)); | |
110 | if (ret) { | |
111 | goto end; | |
112 | } | |
113 | ||
114 | /* Serialize the expression */ | |
115 | switch (expr->type) { | |
116 | case LTTNG_EVENT_EXPR_TYPE_EVENT_PAYLOAD_FIELD: | |
117 | case LTTNG_EVENT_EXPR_TYPE_CHANNEL_CONTEXT_FIELD: | |
118 | { | |
119 | const struct lttng_event_expr_field *field_expr = | |
120 | container_of(expr, | |
121 | const struct lttng_event_expr_field, | |
122 | parent); | |
123 | ||
124 | /* Serialize the field name. */ | |
125 | DBG("Serializing field event expression's field name: '%s'", | |
126 | field_expr->name); | |
127 | ret = serialize_cstr(field_expr->name, &payload->buffer); | |
128 | if (ret) { | |
129 | goto end; | |
130 | } | |
131 | ||
132 | break; | |
133 | } | |
134 | case LTTNG_EVENT_EXPR_TYPE_APP_SPECIFIC_CONTEXT_FIELD: | |
135 | { | |
136 | const struct lttng_event_expr_app_specific_context_field *field_expr = | |
137 | container_of(expr, | |
138 | const struct lttng_event_expr_app_specific_context_field, | |
139 | parent); | |
140 | ||
141 | /* Serialize the provider name. */ | |
142 | DBG("Serializing app-specific context field event expression's " | |
143 | "provider name: '%s'", | |
144 | field_expr->provider_name); | |
145 | ret = serialize_cstr(field_expr->provider_name, &payload->buffer); | |
146 | if (ret) { | |
147 | goto end; | |
148 | } | |
149 | ||
150 | /* Serialize the type name. */ | |
151 | DBG("Serializing app-specific context field event expression's " | |
152 | "type name: '%s'", | |
153 | field_expr->provider_name); | |
154 | ret = serialize_cstr(field_expr->type_name, &payload->buffer); | |
155 | if (ret) { | |
156 | goto end; | |
157 | } | |
158 | ||
159 | break; | |
160 | } | |
161 | case LTTNG_EVENT_EXPR_TYPE_ARRAY_FIELD_ELEMENT: | |
162 | { | |
163 | const struct lttng_event_expr_array_field_element *elem_expr = | |
164 | container_of(expr, | |
165 | const struct lttng_event_expr_array_field_element, | |
166 | parent); | |
167 | const uint32_t index = elem_expr->index; | |
168 | ||
169 | /* Serialize the index. */ | |
170 | DBG("Serializing array field element event expression's " | |
171 | "index: %u", elem_expr->index); | |
172 | ret = lttng_dynamic_buffer_append(&payload->buffer, &index, sizeof(index)); | |
173 | if (ret) { | |
174 | goto end; | |
175 | } | |
176 | ||
177 | /* Serialize the parent array field expression. */ | |
178 | DBG("Serializing array field element event expression's " | |
179 | "parent array field event expression."); | |
180 | ret = serialize_event_expr(elem_expr->array_field_expr, payload); | |
181 | if (ret) { | |
182 | goto end; | |
183 | } | |
184 | ||
185 | break; | |
186 | } | |
187 | default: | |
188 | break; | |
189 | } | |
190 | ||
191 | end: | |
192 | return ret; | |
193 | } | |
194 | ||
683d081a JR |
195 | static int lttng_condition_event_rule_serialize( |
196 | const struct lttng_condition *condition, | |
197 | struct lttng_payload *payload) | |
198 | { | |
199 | int ret; | |
683d081a | 200 | struct lttng_condition_event_rule *event_rule; |
0912b5ea | 201 | enum lttng_condition_status status; |
38114013 PP |
202 | /* Used for iteration and communication (size matters). */ |
203 | uint32_t i, capture_descr_count; | |
683d081a JR |
204 | |
205 | if (!condition || !IS_EVENT_RULE_CONDITION(condition)) { | |
206 | ret = -1; | |
207 | goto end; | |
208 | } | |
209 | ||
210 | DBG("Serializing event rule condition"); | |
211 | event_rule = container_of( | |
212 | condition, struct lttng_condition_event_rule, parent); | |
213 | ||
38114013 PP |
214 | DBG("Serializing event rule condition's event rule"); |
215 | ret = lttng_event_rule_serialize(event_rule->rule, payload); | |
683d081a JR |
216 | if (ret) { |
217 | goto end; | |
218 | } | |
219 | ||
0912b5ea JR |
220 | status = lttng_condition_event_rule_get_capture_descriptor_count( |
221 | condition, &capture_descr_count); | |
222 | if (status != LTTNG_CONDITION_STATUS_OK) { | |
223 | ret = -1; | |
224 | goto end; | |
225 | }; | |
226 | ||
38114013 PP |
227 | DBG("Serializing event rule condition's capture descriptor count: %" PRIu32, |
228 | capture_descr_count); | |
229 | ret = lttng_dynamic_buffer_append(&payload->buffer, &capture_descr_count, | |
230 | sizeof(capture_descr_count)); | |
683d081a JR |
231 | if (ret) { |
232 | goto end; | |
233 | } | |
234 | ||
38114013 PP |
235 | for (i = 0; i < capture_descr_count; i++) { |
236 | const struct lttng_event_expr *expr = | |
0912b5ea JR |
237 | lttng_condition_event_rule_get_capture_descriptor_at_index( |
238 | condition, i); | |
38114013 PP |
239 | |
240 | DBG("Serializing event rule condition's capture descriptor %" PRIu32, | |
241 | i); | |
242 | ret = serialize_event_expr(expr, payload); | |
243 | if (ret) { | |
244 | goto end; | |
245 | } | |
246 | } | |
683d081a JR |
247 | |
248 | end: | |
249 | return ret; | |
250 | } | |
251 | ||
38114013 PP |
252 | static |
253 | bool capture_descriptors_are_equal( | |
0912b5ea JR |
254 | const struct lttng_condition *condition_a, |
255 | const struct lttng_condition *condition_b) | |
38114013 PP |
256 | { |
257 | bool is_equal = true; | |
0912b5ea JR |
258 | unsigned int capture_descr_count_a; |
259 | unsigned int capture_descr_count_b; | |
38114013 | 260 | size_t i; |
0912b5ea | 261 | enum lttng_condition_status status; |
38114013 | 262 | |
0912b5ea JR |
263 | status = lttng_condition_event_rule_get_capture_descriptor_count( |
264 | condition_a, &capture_descr_count_a); | |
265 | if (status != LTTNG_CONDITION_STATUS_OK) { | |
266 | goto not_equal; | |
267 | } | |
268 | ||
269 | status = lttng_condition_event_rule_get_capture_descriptor_count( | |
270 | condition_b, &capture_descr_count_b); | |
271 | if (status != LTTNG_CONDITION_STATUS_OK) { | |
272 | goto not_equal; | |
273 | } | |
38114013 PP |
274 | |
275 | if (capture_descr_count_a != capture_descr_count_b) { | |
276 | goto not_equal; | |
277 | } | |
278 | ||
279 | for (i = 0; i < capture_descr_count_a; i++) { | |
280 | const struct lttng_event_expr *expr_a = | |
0912b5ea JR |
281 | lttng_condition_event_rule_get_capture_descriptor_at_index( |
282 | condition_a, | |
38114013 PP |
283 | i); |
284 | const struct lttng_event_expr *expr_b = | |
0912b5ea JR |
285 | lttng_condition_event_rule_get_capture_descriptor_at_index( |
286 | condition_b, | |
38114013 PP |
287 | i); |
288 | ||
289 | if (!lttng_event_expr_is_equal(expr_a, expr_b)) { | |
290 | goto not_equal; | |
291 | } | |
292 | } | |
293 | ||
294 | goto end; | |
295 | ||
296 | not_equal: | |
297 | is_equal = false; | |
298 | ||
299 | end: | |
300 | return is_equal; | |
301 | } | |
302 | ||
683d081a JR |
303 | static bool lttng_condition_event_rule_is_equal( |
304 | const struct lttng_condition *_a, | |
305 | const struct lttng_condition *_b) | |
306 | { | |
307 | bool is_equal = false; | |
308 | struct lttng_condition_event_rule *a, *b; | |
309 | ||
310 | a = container_of(_a, struct lttng_condition_event_rule, parent); | |
311 | b = container_of(_b, struct lttng_condition_event_rule, parent); | |
312 | ||
313 | /* Both event rules must be set or both must be unset. */ | |
314 | if ((a->rule && !b->rule) || (!a->rule && b->rule)) { | |
315 | WARN("Comparing event_rule conditions with uninitialized rule"); | |
316 | goto end; | |
317 | } | |
318 | ||
319 | is_equal = lttng_event_rule_is_equal(a->rule, b->rule); | |
38114013 PP |
320 | if (!is_equal) { |
321 | goto end; | |
322 | } | |
323 | ||
0912b5ea | 324 | is_equal = capture_descriptors_are_equal(_a, _b); |
38114013 | 325 | |
683d081a JR |
326 | end: |
327 | return is_equal; | |
328 | } | |
329 | ||
330 | static void lttng_condition_event_rule_destroy( | |
331 | struct lttng_condition *condition) | |
332 | { | |
333 | struct lttng_condition_event_rule *event_rule; | |
334 | ||
335 | event_rule = container_of( | |
336 | condition, struct lttng_condition_event_rule, parent); | |
337 | ||
338 | lttng_event_rule_put(event_rule->rule); | |
38114013 | 339 | lttng_dynamic_pointer_array_reset(&event_rule->capture_descriptors); |
683d081a JR |
340 | free(event_rule); |
341 | } | |
342 | ||
38114013 | 343 | static |
0912b5ea | 344 | void destroy_capture_descriptor(void *ptr) |
38114013 | 345 | { |
0912b5ea JR |
346 | struct lttng_capture_descriptor *desc = |
347 | (struct lttng_capture_descriptor *) ptr; | |
348 | ||
349 | lttng_event_expr_destroy(desc->event_expression); | |
350 | free(desc->bytecode); | |
351 | free(desc); | |
38114013 PP |
352 | } |
353 | ||
683d081a JR |
354 | struct lttng_condition *lttng_condition_event_rule_create( |
355 | struct lttng_event_rule *rule) | |
356 | { | |
357 | struct lttng_condition *parent = NULL; | |
358 | struct lttng_condition_event_rule *condition = NULL; | |
359 | ||
360 | if (!rule) { | |
361 | goto end; | |
362 | } | |
363 | ||
364 | condition = zmalloc(sizeof(struct lttng_condition_event_rule)); | |
365 | if (!condition) { | |
366 | return NULL; | |
367 | } | |
368 | ||
369 | lttng_condition_init(&condition->parent, | |
370 | LTTNG_CONDITION_TYPE_EVENT_RULE_HIT); | |
371 | condition->parent.validate = lttng_condition_event_rule_validate, | |
372 | condition->parent.serialize = lttng_condition_event_rule_serialize, | |
373 | condition->parent.equal = lttng_condition_event_rule_is_equal, | |
374 | condition->parent.destroy = lttng_condition_event_rule_destroy, | |
375 | ||
376 | lttng_event_rule_get(rule); | |
377 | condition->rule = rule; | |
378 | rule = NULL; | |
379 | ||
38114013 | 380 | lttng_dynamic_pointer_array_init(&condition->capture_descriptors, |
0912b5ea | 381 | destroy_capture_descriptor); |
38114013 | 382 | |
683d081a JR |
383 | parent = &condition->parent; |
384 | end: | |
385 | return parent; | |
386 | } | |
387 | ||
38114013 PP |
388 | static |
389 | uint64_t uint_from_buffer(const struct lttng_buffer_view *view, size_t size, | |
390 | size_t *offset) | |
391 | { | |
392 | uint64_t ret; | |
393 | const struct lttng_buffer_view uint_view = | |
394 | lttng_buffer_view_from_view(view, *offset, size); | |
395 | ||
396 | if (!lttng_buffer_view_is_valid(&uint_view)) { | |
397 | ret = UINT64_C(-1); | |
398 | goto end; | |
399 | } | |
400 | ||
401 | switch (size) { | |
402 | case 1: | |
403 | ret = (uint64_t) *uint_view.data; | |
404 | break; | |
405 | case sizeof(uint32_t): | |
406 | { | |
407 | uint32_t u32; | |
408 | ||
409 | memcpy(&u32, uint_view.data, sizeof(u32)); | |
410 | ret = (uint64_t) u32; | |
411 | break; | |
412 | } | |
413 | case sizeof(ret): | |
414 | memcpy(&ret, uint_view.data, sizeof(ret)); | |
415 | break; | |
416 | default: | |
417 | abort(); | |
418 | } | |
419 | ||
420 | *offset += size; | |
421 | ||
422 | end: | |
423 | return ret; | |
424 | } | |
425 | ||
426 | static | |
427 | const char *str_from_buffer(const struct lttng_buffer_view *view, | |
428 | size_t *offset) | |
429 | { | |
430 | uint64_t len; | |
431 | const char *ret; | |
432 | ||
433 | len = uint_from_buffer(view, sizeof(uint32_t), offset); | |
434 | if (len == UINT64_C(-1)) { | |
435 | goto error; | |
436 | } | |
437 | ||
438 | ret = &view->data[*offset]; | |
439 | ||
440 | if (!lttng_buffer_view_contains_string(view, ret, len)) { | |
441 | goto error; | |
442 | } | |
443 | ||
444 | *offset += len; | |
445 | goto end; | |
446 | ||
447 | error: | |
448 | ret = NULL; | |
449 | ||
450 | end: | |
451 | return ret; | |
452 | } | |
453 | ||
454 | static | |
455 | struct lttng_event_expr *event_expr_from_payload( | |
456 | struct lttng_payload_view *view, size_t *offset) | |
457 | { | |
458 | struct lttng_event_expr *expr = NULL; | |
459 | const char *str; | |
460 | uint64_t type; | |
461 | ||
462 | type = uint_from_buffer(&view->buffer, sizeof(uint8_t), offset); | |
463 | if (type == UINT64_C(-1)) { | |
464 | goto error; | |
465 | } | |
466 | ||
467 | switch (type) { | |
468 | case LTTNG_EVENT_EXPR_TYPE_EVENT_PAYLOAD_FIELD: | |
469 | str = str_from_buffer(&view->buffer, offset); | |
470 | if (!str) { | |
471 | goto error; | |
472 | } | |
473 | ||
474 | expr = lttng_event_expr_event_payload_field_create(str); | |
475 | break; | |
476 | case LTTNG_EVENT_EXPR_TYPE_CHANNEL_CONTEXT_FIELD: | |
477 | str = str_from_buffer(&view->buffer, offset); | |
478 | if (!str) { | |
479 | goto error; | |
480 | } | |
481 | ||
482 | expr = lttng_event_expr_channel_context_field_create(str); | |
483 | break; | |
484 | case LTTNG_EVENT_EXPR_TYPE_APP_SPECIFIC_CONTEXT_FIELD: | |
485 | { | |
486 | const char *provider_name; | |
487 | const char *type_name; | |
488 | ||
489 | provider_name = str_from_buffer(&view->buffer, offset); | |
490 | if (!provider_name) { | |
491 | goto error; | |
492 | } | |
493 | ||
494 | type_name = str_from_buffer(&view->buffer, offset); | |
495 | if (!type_name) { | |
496 | goto error; | |
497 | } | |
498 | ||
499 | expr = lttng_event_expr_app_specific_context_field_create( | |
500 | provider_name, type_name); | |
501 | break; | |
502 | } | |
503 | case LTTNG_EVENT_EXPR_TYPE_ARRAY_FIELD_ELEMENT: | |
504 | { | |
505 | struct lttng_event_expr *array_field_expr; | |
506 | const uint64_t index = uint_from_buffer( | |
507 | &view->buffer, sizeof(uint32_t), offset); | |
508 | ||
509 | if (index == UINT64_C(-1)) { | |
510 | goto error; | |
511 | } | |
512 | ||
513 | /* Array field expression is the encoded after this. */ | |
514 | array_field_expr = event_expr_from_payload(view, offset); | |
515 | if (!array_field_expr) { | |
516 | goto error; | |
517 | } | |
518 | ||
519 | /* Move ownership of `array_field_expr` to new expression. */ | |
520 | expr = lttng_event_expr_array_field_element_create( | |
521 | array_field_expr, (unsigned int) index); | |
522 | if (!expr) { | |
523 | /* `array_field_expr` not moved: destroy it. */ | |
524 | lttng_event_expr_destroy(array_field_expr); | |
525 | } | |
526 | ||
527 | break; | |
528 | } | |
529 | default: | |
530 | abort(); | |
531 | } | |
532 | ||
533 | goto end; | |
534 | ||
535 | error: | |
536 | lttng_event_expr_destroy(expr); | |
537 | expr = NULL; | |
538 | ||
539 | end: | |
540 | return expr; | |
541 | } | |
542 | ||
683d081a JR |
543 | LTTNG_HIDDEN |
544 | ssize_t lttng_condition_event_rule_create_from_payload( | |
545 | struct lttng_payload_view *view, | |
546 | struct lttng_condition **_condition) | |
547 | { | |
38114013 PP |
548 | ssize_t consumed_length; |
549 | size_t offset = 0; | |
550 | ssize_t event_rule_length; | |
551 | uint32_t i, capture_descr_count; | |
683d081a JR |
552 | struct lttng_condition *condition = NULL; |
553 | struct lttng_event_rule *event_rule = NULL; | |
683d081a JR |
554 | |
555 | if (!view || !_condition) { | |
556 | goto error; | |
557 | } | |
558 | ||
38114013 | 559 | /* Struct lttng_event_rule. */ |
683d081a JR |
560 | { |
561 | struct lttng_payload_view event_rule_view = | |
562 | lttng_payload_view_from_view(view, offset, -1); | |
563 | ||
564 | event_rule_length = lttng_event_rule_create_from_payload( | |
565 | &event_rule_view, &event_rule); | |
566 | } | |
567 | ||
568 | if (event_rule_length < 0 || !event_rule) { | |
569 | goto error; | |
570 | } | |
571 | ||
38114013 PP |
572 | /* Create condition (no capture descriptors yet) at this point. */ |
573 | condition = lttng_condition_event_rule_create(event_rule); | |
574 | if (!condition) { | |
683d081a JR |
575 | goto error; |
576 | } | |
577 | ||
683d081a | 578 | |
38114013 PP |
579 | /* Capture descriptor count. */ |
580 | assert(event_rule_length >= 0); | |
581 | offset += (size_t) event_rule_length; | |
582 | capture_descr_count = uint_from_buffer(&view->buffer, sizeof(uint32_t), &offset); | |
583 | if (capture_descr_count == UINT32_C(-1)) { | |
683d081a JR |
584 | goto error; |
585 | } | |
586 | ||
38114013 PP |
587 | /* Capture descriptors. */ |
588 | for (i = 0; i < capture_descr_count; i++) { | |
589 | struct lttng_event_expr *expr = event_expr_from_payload( | |
590 | view, &offset); | |
591 | enum lttng_condition_status status; | |
592 | ||
593 | if (!expr) { | |
594 | goto error; | |
595 | } | |
596 | ||
597 | /* Move ownership of `expr` to `condition`. */ | |
598 | status = lttng_condition_event_rule_append_capture_descriptor( | |
599 | condition, expr); | |
600 | if (status != LTTNG_CONDITION_STATUS_OK) { | |
601 | /* `expr` not moved: destroy it. */ | |
602 | lttng_event_expr_destroy(expr); | |
603 | goto error; | |
604 | } | |
605 | } | |
606 | ||
607 | consumed_length = (ssize_t) offset; | |
683d081a JR |
608 | *_condition = condition; |
609 | condition = NULL; | |
610 | goto end; | |
611 | ||
612 | error: | |
38114013 | 613 | consumed_length = -1; |
683d081a JR |
614 | |
615 | end: | |
616 | lttng_event_rule_put(event_rule); | |
617 | lttng_condition_put(condition); | |
38114013 | 618 | return consumed_length; |
683d081a JR |
619 | } |
620 | ||
621 | LTTNG_HIDDEN | |
622 | enum lttng_condition_status lttng_condition_event_rule_borrow_rule_mutable( | |
623 | const struct lttng_condition *condition, | |
624 | struct lttng_event_rule **rule) | |
625 | { | |
626 | struct lttng_condition_event_rule *event_rule; | |
627 | enum lttng_condition_status status = LTTNG_CONDITION_STATUS_OK; | |
628 | ||
629 | if (!condition || !IS_EVENT_RULE_CONDITION(condition) || !rule) { | |
630 | status = LTTNG_CONDITION_STATUS_INVALID; | |
631 | goto end; | |
632 | } | |
633 | ||
634 | event_rule = container_of( | |
635 | condition, struct lttng_condition_event_rule, parent); | |
636 | if (!event_rule->rule) { | |
637 | status = LTTNG_CONDITION_STATUS_UNSET; | |
638 | goto end; | |
639 | } | |
640 | ||
641 | *rule = event_rule->rule; | |
642 | end: | |
643 | return status; | |
644 | } | |
645 | ||
646 | enum lttng_condition_status lttng_condition_event_rule_get_rule( | |
647 | const struct lttng_condition *condition, | |
648 | const struct lttng_event_rule **rule) | |
649 | { | |
650 | struct lttng_event_rule *mutable_rule = NULL; | |
651 | const enum lttng_condition_status status = | |
652 | lttng_condition_event_rule_borrow_rule_mutable( | |
653 | condition, &mutable_rule); | |
654 | ||
655 | *rule = mutable_rule; | |
656 | return status; | |
657 | } | |
658 | ||
38114013 PP |
659 | enum lttng_condition_status |
660 | lttng_condition_event_rule_append_capture_descriptor( | |
661 | struct lttng_condition *condition, | |
662 | struct lttng_event_expr *expr) | |
663 | { | |
664 | int ret; | |
665 | enum lttng_condition_status status = LTTNG_CONDITION_STATUS_OK; | |
666 | struct lttng_condition_event_rule *event_rule_cond = | |
667 | container_of(condition, | |
668 | struct lttng_condition_event_rule, parent); | |
0912b5ea | 669 | struct lttng_capture_descriptor *descriptor = NULL; |
38114013 PP |
670 | |
671 | /* Only accept l-values. */ | |
672 | if (!condition || !IS_EVENT_RULE_CONDITION(condition) || !expr || | |
673 | !lttng_event_expr_is_lvalue(expr)) { | |
674 | status = LTTNG_CONDITION_STATUS_INVALID; | |
675 | goto end; | |
676 | } | |
677 | ||
0912b5ea JR |
678 | descriptor = malloc(sizeof(*descriptor)); |
679 | if (descriptor == NULL) { | |
680 | status = LTTNG_CONDITION_STATUS_ERROR; | |
681 | goto end; | |
682 | } | |
683 | ||
684 | descriptor->event_expression = expr; | |
685 | descriptor->bytecode = NULL; | |
686 | ||
38114013 | 687 | ret = lttng_dynamic_pointer_array_add_pointer( |
0912b5ea | 688 | &event_rule_cond->capture_descriptors, descriptor); |
38114013 PP |
689 | if (ret) { |
690 | status = LTTNG_CONDITION_STATUS_ERROR; | |
691 | goto end; | |
692 | } | |
693 | ||
0912b5ea JR |
694 | /* Ownership is transfered to the internal capture_descriptors array */ |
695 | descriptor = NULL; | |
38114013 | 696 | end: |
0912b5ea | 697 | free(descriptor); |
38114013 PP |
698 | return status; |
699 | } | |
700 | ||
701 | enum lttng_condition_status | |
702 | lttng_condition_event_rule_get_capture_descriptor_count( | |
703 | const struct lttng_condition *condition, unsigned int *count) | |
704 | { | |
705 | enum lttng_condition_status status = LTTNG_CONDITION_STATUS_OK; | |
706 | const struct lttng_condition_event_rule *event_rule_cond = | |
707 | container_of(condition, | |
708 | const struct lttng_condition_event_rule, | |
709 | parent); | |
710 | ||
711 | if (!condition || !IS_EVENT_RULE_CONDITION(condition) || !count) { | |
712 | status = LTTNG_CONDITION_STATUS_INVALID; | |
713 | goto end; | |
714 | } | |
715 | ||
716 | *count = lttng_dynamic_pointer_array_get_count( | |
717 | &event_rule_cond->capture_descriptors); | |
718 | ||
719 | end: | |
720 | return status; | |
721 | } | |
722 | ||
723 | const struct lttng_event_expr * | |
724 | lttng_condition_event_rule_get_capture_descriptor_at_index( | |
725 | const struct lttng_condition *condition, unsigned int index) | |
726 | { | |
727 | const struct lttng_condition_event_rule *event_rule_cond = | |
728 | container_of(condition, | |
729 | const struct lttng_condition_event_rule, | |
730 | parent); | |
731 | const struct lttng_event_expr *expr = NULL; | |
0912b5ea JR |
732 | struct lttng_capture_descriptor *desc = NULL; |
733 | unsigned int count; | |
734 | enum lttng_condition_status status; | |
735 | ||
736 | if (!condition || !IS_EVENT_RULE_CONDITION(condition)) { | |
737 | goto end; | |
738 | } | |
739 | ||
740 | status = lttng_condition_event_rule_get_capture_descriptor_count(condition, &count); | |
741 | if (status != LTTNG_CONDITION_STATUS_OK) { | |
742 | goto end; | |
743 | } | |
38114013 | 744 | |
0912b5ea | 745 | if (index >= count) { |
38114013 PP |
746 | goto end; |
747 | } | |
748 | ||
0912b5ea | 749 | desc = lttng_dynamic_pointer_array_get_pointer( |
38114013 | 750 | &event_rule_cond->capture_descriptors, index); |
0912b5ea | 751 | expr = desc->event_expression; |
38114013 PP |
752 | |
753 | end: | |
754 | return expr; | |
755 | } | |
756 | ||
683d081a JR |
757 | LTTNG_HIDDEN |
758 | ssize_t lttng_evaluation_event_rule_create_from_payload( | |
759 | struct lttng_payload_view *view, | |
760 | struct lttng_evaluation **_evaluation) | |
761 | { | |
762 | ssize_t ret, offset = 0; | |
763 | const char *trigger_name; | |
764 | struct lttng_evaluation *evaluation = NULL; | |
765 | const struct lttng_evaluation_event_rule_comm *header; | |
766 | const struct lttng_payload_view header_view = | |
767 | lttng_payload_view_from_view( | |
768 | view, 0, sizeof(*header)); | |
769 | ||
770 | if (!_evaluation) { | |
771 | ret = -1; | |
772 | goto error; | |
773 | } | |
774 | ||
775 | if (!lttng_payload_view_is_valid(&header_view)) { | |
776 | ERR("Failed to initialize from malformed event rule evaluation: buffer too short to contain header"); | |
777 | ret = -1; | |
778 | goto error; | |
779 | } | |
780 | ||
781 | header = (typeof(header)) header_view.buffer.data; | |
782 | ||
783 | /* Map the originating trigger's name. */ | |
784 | offset += sizeof(*header); | |
785 | { | |
786 | struct lttng_payload_view current_view = | |
787 | lttng_payload_view_from_view(view, offset, | |
788 | header->trigger_name_length); | |
789 | ||
790 | if (!lttng_payload_view_is_valid(¤t_view)) { | |
791 | ERR("Failed to initialize from malformed event rule evaluation: buffer too short to contain trigger name"); | |
792 | ret = -1; | |
793 | goto error; | |
794 | } | |
795 | ||
796 | trigger_name = current_view.buffer.data; | |
797 | if (!lttng_buffer_view_contains_string(¤t_view.buffer, | |
798 | trigger_name, header->trigger_name_length)) { | |
799 | ERR("Failed to initialize from malformed event rule evaluation: invalid trigger name"); | |
800 | ret = -1; | |
801 | goto error; | |
802 | } | |
803 | } | |
804 | ||
805 | offset += header->trigger_name_length; | |
806 | ||
807 | evaluation = lttng_evaluation_event_rule_create(trigger_name); | |
808 | if (!evaluation) { | |
809 | ret = -1; | |
810 | goto error; | |
811 | } | |
812 | ||
813 | *_evaluation = evaluation; | |
814 | evaluation = NULL; | |
815 | ret = offset; | |
816 | ||
817 | error: | |
818 | lttng_evaluation_destroy(evaluation); | |
819 | return ret; | |
820 | } | |
821 | ||
822 | static int lttng_evaluation_event_rule_serialize( | |
823 | const struct lttng_evaluation *evaluation, | |
824 | struct lttng_payload *payload) | |
825 | { | |
826 | int ret = 0; | |
827 | struct lttng_evaluation_event_rule *hit; | |
828 | struct lttng_evaluation_event_rule_comm comm; | |
829 | ||
830 | hit = container_of( | |
831 | evaluation, struct lttng_evaluation_event_rule, parent); | |
832 | ||
833 | assert(hit->name); | |
834 | comm.trigger_name_length = strlen(hit->name) + 1; | |
835 | ||
836 | ret = lttng_dynamic_buffer_append( | |
837 | &payload->buffer, &comm, sizeof(comm)); | |
838 | if (ret) { | |
839 | goto end; | |
840 | } | |
841 | ||
842 | ret = lttng_dynamic_buffer_append( | |
843 | &payload->buffer, hit->name, comm.trigger_name_length); | |
844 | end: | |
845 | return ret; | |
846 | } | |
847 | ||
848 | static void lttng_evaluation_event_rule_destroy( | |
849 | struct lttng_evaluation *evaluation) | |
850 | { | |
851 | struct lttng_evaluation_event_rule *hit; | |
852 | ||
853 | hit = container_of( | |
854 | evaluation, struct lttng_evaluation_event_rule, parent); | |
855 | free(hit->name); | |
856 | free(hit); | |
857 | } | |
858 | ||
859 | LTTNG_HIDDEN | |
860 | struct lttng_evaluation *lttng_evaluation_event_rule_create( | |
861 | const char *trigger_name) | |
862 | { | |
863 | struct lttng_evaluation_event_rule *hit; | |
864 | struct lttng_evaluation *evaluation = NULL; | |
865 | ||
866 | hit = zmalloc(sizeof(struct lttng_evaluation_event_rule)); | |
867 | if (!hit) { | |
868 | goto end; | |
869 | } | |
870 | ||
871 | hit->name = strdup(trigger_name); | |
872 | if (!hit->name) { | |
873 | goto end; | |
874 | } | |
875 | ||
876 | hit->parent.type = LTTNG_CONDITION_TYPE_EVENT_RULE_HIT; | |
877 | hit->parent.serialize = lttng_evaluation_event_rule_serialize; | |
878 | hit->parent.destroy = lttng_evaluation_event_rule_destroy; | |
879 | ||
880 | evaluation = &hit->parent; | |
881 | hit = NULL; | |
882 | ||
883 | end: | |
884 | if (hit) { | |
885 | lttng_evaluation_event_rule_destroy(&hit->parent); | |
886 | } | |
887 | ||
888 | return evaluation; | |
889 | } | |
890 | ||
891 | enum lttng_evaluation_status lttng_evaluation_event_rule_get_trigger_name( | |
892 | const struct lttng_evaluation *evaluation, const char **name) | |
893 | { | |
894 | struct lttng_evaluation_event_rule *hit; | |
895 | enum lttng_evaluation_status status = LTTNG_EVALUATION_STATUS_OK; | |
896 | ||
897 | if (!evaluation || !is_event_rule_evaluation(evaluation) || !name) { | |
898 | status = LTTNG_EVALUATION_STATUS_INVALID; | |
899 | goto end; | |
900 | } | |
901 | ||
902 | hit = container_of( | |
903 | evaluation, struct lttng_evaluation_event_rule, parent); | |
904 | *name = hit->name; | |
905 | end: | |
906 | return status; | |
907 | } |