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2463b787 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/event-expr-to-bytecode.h> | |
11 | #include <common/macros.h> | |
12 | #include <inttypes.h> | |
13 | #include <limits.h> | |
14 | #include <lttng/condition/condition-internal.h> | |
15 | #include <lttng/condition/event-rule-internal.h> | |
16 | #include <lttng/condition/event-rule.h> | |
17 | #include <lttng/event-expr-internal.h> | |
18 | #include <lttng/event-expr.h> | |
19 | #include <lttng/event-field-value-internal.h> | |
20 | #include <lttng/event-rule/event-rule-internal.h> | |
21 | #include <lttng/lttng-error.h> | |
22 | #include <stdbool.h> | |
23 | #include <stdint.h> | |
24 | #include <vendor/msgpack/msgpack.h> | |
25 | ||
26 | #define IS_EVENT_RULE_CONDITION(condition) \ | |
27 | (lttng_condition_get_type(condition) == \ | |
28 | LTTNG_CONDITION_TYPE_EVENT_RULE_HIT) | |
29 | ||
30 | static bool is_event_rule_evaluation(const struct lttng_evaluation *evaluation) | |
31 | { | |
32 | enum lttng_condition_type type = lttng_evaluation_get_type(evaluation); | |
33 | ||
34 | return type == LTTNG_CONDITION_TYPE_EVENT_RULE_HIT; | |
35 | } | |
36 | ||
37 | static bool lttng_condition_event_rule_validate( | |
38 | const struct lttng_condition *condition); | |
39 | static int lttng_condition_event_rule_serialize( | |
40 | const struct lttng_condition *condition, | |
41 | struct lttng_payload *payload); | |
42 | static bool lttng_condition_event_rule_is_equal( | |
43 | const struct lttng_condition *_a, | |
44 | const struct lttng_condition *_b); | |
45 | static void lttng_condition_event_rule_destroy( | |
46 | struct lttng_condition *condition); | |
47 | ||
48 | static bool lttng_condition_event_rule_validate( | |
49 | const struct lttng_condition *condition) | |
50 | { | |
51 | bool valid = false; | |
52 | struct lttng_condition_event_rule *event_rule; | |
53 | ||
54 | if (!condition) { | |
55 | goto end; | |
56 | } | |
57 | ||
58 | event_rule = container_of( | |
59 | condition, struct lttng_condition_event_rule, parent); | |
60 | if (!event_rule->rule) { | |
61 | ERR("Invalid session event_rule condition: a rule must be set."); | |
62 | goto end; | |
63 | } | |
64 | ||
65 | valid = lttng_event_rule_validate(event_rule->rule); | |
66 | end: | |
67 | return valid; | |
68 | } | |
69 | ||
70 | /* | |
71 | * Serializes the C string `str` into `buf`. | |
72 | * | |
73 | * Encoding is the length of `str` plus one (for the null character), | |
74 | * and then the string, including its null character. | |
75 | */ | |
76 | static | |
77 | int serialize_cstr(const char *str, struct lttng_dynamic_buffer *buf) | |
78 | { | |
79 | int ret; | |
80 | uint32_t len = strlen(str) + 1; | |
81 | ||
82 | /* Serialize the length, including the null character */ | |
83 | DBG("Serializing C string's length (including null character): " | |
84 | "%" PRIu32, len); | |
85 | ret = lttng_dynamic_buffer_append(buf, &len, sizeof(len)); | |
86 | if (ret) { | |
87 | goto end; | |
88 | } | |
89 | ||
90 | /* Serialize the string */ | |
91 | DBG("Serializing C string: \"%s\"", str); | |
92 | ret = lttng_dynamic_buffer_append(buf, str, len); | |
93 | if (ret) { | |
94 | goto end; | |
95 | } | |
96 | ||
97 | end: | |
98 | return ret; | |
99 | } | |
100 | ||
101 | /* | |
102 | * Serializes the event expression `expr` into `buf`. | |
103 | */ | |
104 | static | |
105 | int serialize_event_expr(const struct lttng_event_expr *expr, | |
106 | struct lttng_payload *payload) | |
107 | { | |
108 | uint8_t type; | |
109 | int ret; | |
110 | ||
111 | /* Serialize the expression's type */ | |
112 | DBG("Serializing event expression's type: %d", expr->type); | |
113 | type = expr->type; | |
114 | ret = lttng_dynamic_buffer_append(&payload->buffer, &type, sizeof(type)); | |
115 | if (ret) { | |
116 | goto end; | |
117 | } | |
118 | ||
119 | /* Serialize the expression */ | |
120 | switch (expr->type) { | |
121 | case LTTNG_EVENT_EXPR_TYPE_EVENT_PAYLOAD_FIELD: | |
122 | case LTTNG_EVENT_EXPR_TYPE_CHANNEL_CONTEXT_FIELD: | |
123 | { | |
124 | const struct lttng_event_expr_field *field_expr = | |
125 | container_of(expr, | |
126 | const struct lttng_event_expr_field, | |
127 | parent); | |
128 | ||
129 | /* Serialize the field name */ | |
130 | DBG("Serializing field event expression's field name: \"%s\"", | |
131 | field_expr->name); | |
132 | ret = serialize_cstr(field_expr->name, &payload->buffer); | |
133 | if (ret) { | |
134 | goto end; | |
135 | } | |
136 | ||
137 | break; | |
138 | } | |
139 | case LTTNG_EVENT_EXPR_TYPE_APP_SPECIFIC_CONTEXT_FIELD: | |
140 | { | |
141 | const struct lttng_event_expr_app_specific_context_field *field_expr = | |
142 | container_of(expr, | |
143 | const struct lttng_event_expr_app_specific_context_field, | |
144 | parent); | |
145 | ||
146 | /* Serialize the provider name */ | |
147 | DBG("Serializing app-specific context field event expression's " | |
148 | "provider name: \"%s\"", | |
149 | field_expr->provider_name); | |
150 | ret = serialize_cstr(field_expr->provider_name, &payload->buffer); | |
151 | if (ret) { | |
152 | goto end; | |
153 | } | |
154 | ||
155 | /* Serialize the type name */ | |
156 | DBG("Serializing app-specific context field event expression's " | |
157 | "type name: \"%s\"", | |
158 | field_expr->provider_name); | |
159 | ret = serialize_cstr(field_expr->type_name, &payload->buffer); | |
160 | if (ret) { | |
161 | goto end; | |
162 | } | |
163 | ||
164 | break; | |
165 | } | |
166 | case LTTNG_EVENT_EXPR_TYPE_ARRAY_FIELD_ELEMENT: | |
167 | { | |
168 | const struct lttng_event_expr_array_field_element *elem_expr = | |
169 | container_of(expr, | |
170 | const struct lttng_event_expr_array_field_element, | |
171 | parent); | |
172 | uint32_t index = elem_expr->index; | |
173 | ||
174 | /* Serialize the index */ | |
175 | DBG("Serializing array field element event expression's " | |
176 | "index: %u", elem_expr->index); | |
177 | ret = lttng_dynamic_buffer_append(&payload->buffer, &index, sizeof(index)); | |
178 | if (ret) { | |
179 | goto end; | |
180 | } | |
181 | ||
182 | /* Serialize the parent array field expression */ | |
183 | DBG("Serializing array field element event expression's " | |
184 | "parent array field event expression."); | |
185 | ret = serialize_event_expr(elem_expr->array_field_expr, payload); | |
186 | if (ret) { | |
187 | goto end; | |
188 | } | |
189 | ||
190 | break; | |
191 | } | |
192 | default: | |
193 | break; | |
194 | } | |
195 | ||
196 | end: | |
197 | return ret; | |
198 | } | |
199 | ||
200 | LTTNG_HIDDEN | |
201 | struct lttng_capture_descriptor * | |
202 | lttng_condition_event_rule_get_internal_capture_descriptor_at_index( | |
203 | const struct lttng_condition *condition, unsigned int index) | |
204 | { | |
205 | const struct lttng_condition_event_rule *event_rule_cond = | |
206 | container_of(condition, | |
207 | const struct lttng_condition_event_rule, | |
208 | parent); | |
209 | struct lttng_capture_descriptor *desc = NULL; | |
210 | unsigned int count; | |
211 | enum lttng_condition_status status; | |
212 | ||
213 | if (!condition || !IS_EVENT_RULE_CONDITION(condition)) { | |
214 | goto end; | |
215 | } | |
216 | ||
217 | status = lttng_condition_event_rule_get_capture_descriptor_count( | |
218 | condition, &count); | |
219 | if (status != LTTNG_CONDITION_STATUS_OK) { | |
220 | goto end; | |
221 | } | |
222 | ||
223 | if (index >= count) { | |
224 | goto end; | |
225 | } | |
226 | ||
227 | desc = lttng_dynamic_pointer_array_get_pointer( | |
228 | &event_rule_cond->capture_descriptors, index); | |
229 | end: | |
230 | return desc; | |
231 | } | |
232 | ||
233 | static int lttng_condition_event_rule_serialize( | |
234 | const struct lttng_condition *condition, | |
235 | struct lttng_payload *payload) | |
236 | { | |
237 | int ret; | |
238 | struct lttng_condition_event_rule *event_rule; | |
239 | enum lttng_condition_status status; | |
240 | uint32_t capture_descr_count; | |
241 | uint32_t i; | |
242 | ||
243 | if (!condition || !IS_EVENT_RULE_CONDITION(condition)) { | |
244 | ret = -1; | |
245 | goto end; | |
246 | } | |
247 | ||
248 | DBG("Serializing event rule condition"); | |
249 | event_rule = container_of( | |
250 | condition, struct lttng_condition_event_rule, parent); | |
251 | ||
252 | DBG("Serializing event rule condition's event rule"); | |
253 | ret = lttng_event_rule_serialize(event_rule->rule, payload); | |
254 | if (ret) { | |
255 | goto end; | |
256 | } | |
257 | ||
258 | status = lttng_condition_event_rule_get_capture_descriptor_count( | |
259 | condition, &capture_descr_count); | |
260 | if (status != LTTNG_CONDITION_STATUS_OK) { | |
261 | ret = -1; | |
262 | goto end; | |
263 | }; | |
264 | ||
265 | DBG("Serializing event rule condition's capture descriptor count: %" PRIu32, | |
266 | capture_descr_count); | |
267 | ret = lttng_dynamic_buffer_append(&payload->buffer, &capture_descr_count, | |
268 | sizeof(capture_descr_count)); | |
269 | if (ret) { | |
270 | goto end; | |
271 | } | |
272 | ||
273 | for (i = 0; i < capture_descr_count; i++) { | |
274 | const struct lttng_capture_descriptor *desc = | |
275 | lttng_condition_event_rule_get_internal_capture_descriptor_at_index( | |
276 | condition, i); | |
277 | ||
278 | DBG("Serializing event rule condition's capture descriptor %" PRIu32, | |
279 | i); | |
280 | ret = serialize_event_expr(desc->event_expression, payload); | |
281 | if (ret) { | |
282 | goto end; | |
283 | } | |
284 | ||
285 | /* | |
286 | * Appending the internal index payload linked with the | |
287 | * descriptor. | |
288 | * TODO: might want to move to an englobing object to describe a | |
289 | * capture descriptor publicly. | |
290 | */ | |
291 | ret = lttng_dynamic_buffer_append(&payload->buffer, &desc->capture_index, | |
292 | sizeof(desc->capture_index)); | |
293 | if (ret) { | |
294 | goto end; | |
295 | } | |
296 | } | |
297 | ||
298 | end: | |
299 | return ret; | |
300 | } | |
301 | ||
302 | static | |
303 | bool capture_descriptors_are_equal( | |
304 | const struct lttng_condition *condition_a, | |
305 | const struct lttng_condition *condition_b) | |
306 | { | |
307 | bool is_equal = true; | |
308 | unsigned int capture_descr_count_a; | |
309 | unsigned int capture_descr_count_b; | |
310 | size_t i; | |
311 | enum lttng_condition_status status; | |
312 | ||
313 | status = lttng_condition_event_rule_get_capture_descriptor_count( | |
314 | condition_a, &capture_descr_count_a); | |
315 | if (status != LTTNG_CONDITION_STATUS_OK) { | |
316 | goto not_equal; | |
317 | } | |
318 | ||
319 | status = lttng_condition_event_rule_get_capture_descriptor_count( | |
320 | condition_b, &capture_descr_count_b); | |
321 | if (status != LTTNG_CONDITION_STATUS_OK) { | |
322 | goto not_equal; | |
323 | } | |
324 | ||
325 | if (capture_descr_count_a != capture_descr_count_b) { | |
326 | goto not_equal; | |
327 | } | |
328 | ||
329 | for (i = 0; i < capture_descr_count_a; i++) { | |
330 | const struct lttng_event_expr *expr_a = | |
331 | lttng_condition_event_rule_get_capture_descriptor_at_index( | |
332 | condition_a, | |
333 | i); | |
334 | const struct lttng_event_expr *expr_b = | |
335 | lttng_condition_event_rule_get_capture_descriptor_at_index( | |
336 | condition_b, | |
337 | i); | |
338 | ||
339 | if (!lttng_event_expr_is_equal(expr_a, expr_b)) { | |
340 | goto not_equal; | |
341 | } | |
342 | } | |
343 | ||
344 | goto end; | |
345 | ||
346 | not_equal: | |
347 | is_equal = false; | |
348 | ||
349 | end: | |
350 | return is_equal; | |
351 | } | |
352 | ||
353 | static bool lttng_condition_event_rule_is_equal( | |
354 | const struct lttng_condition *_a, | |
355 | const struct lttng_condition *_b) | |
356 | { | |
357 | bool is_equal = false; | |
358 | struct lttng_condition_event_rule *a, *b; | |
359 | ||
360 | a = container_of(_a, struct lttng_condition_event_rule, parent); | |
361 | b = container_of(_b, struct lttng_condition_event_rule, parent); | |
362 | ||
363 | /* Both session names must be set or both must be unset. */ | |
364 | if ((a->rule && !b->rule) || (!a->rule && b->rule)) { | |
365 | WARN("Comparing session event_rule conditions with uninitialized rule."); | |
366 | goto end; | |
367 | } | |
368 | ||
369 | is_equal = lttng_event_rule_is_equal(a->rule, b->rule); | |
370 | if (!is_equal) { | |
371 | goto end; | |
372 | } | |
373 | ||
374 | is_equal = capture_descriptors_are_equal(_a, _b); | |
375 | ||
376 | end: | |
377 | return is_equal; | |
378 | } | |
379 | ||
380 | static void lttng_condition_event_rule_destroy( | |
381 | struct lttng_condition *condition) | |
382 | { | |
383 | struct lttng_condition_event_rule *event_rule; | |
384 | ||
385 | event_rule = container_of( | |
386 | condition, struct lttng_condition_event_rule, parent); | |
387 | ||
388 | lttng_event_rule_destroy(event_rule->rule); | |
389 | lttng_dynamic_pointer_array_reset(&event_rule->capture_descriptors); | |
390 | free(event_rule); | |
391 | } | |
392 | ||
393 | static | |
394 | void destroy_capture_descriptor(void *ptr) | |
395 | { | |
396 | struct lttng_capture_descriptor *desc = | |
397 | (struct lttng_capture_descriptor *) ptr; | |
398 | lttng_event_expr_destroy(desc->event_expression); | |
399 | free(desc); | |
400 | } | |
401 | ||
402 | struct lttng_condition *lttng_condition_event_rule_create( | |
403 | struct lttng_event_rule *rule) | |
404 | { | |
405 | struct lttng_condition *parent = NULL; | |
406 | struct lttng_condition_event_rule *condition = NULL; | |
407 | ||
408 | if (!rule) { | |
409 | goto end; | |
410 | } | |
411 | ||
412 | condition = zmalloc(sizeof(struct lttng_condition_event_rule)); | |
413 | if (!condition) { | |
414 | return NULL; | |
415 | } | |
416 | ||
417 | lttng_condition_init(&condition->parent, | |
418 | LTTNG_CONDITION_TYPE_EVENT_RULE_HIT); | |
419 | condition->parent.validate = lttng_condition_event_rule_validate, | |
420 | condition->parent.serialize = lttng_condition_event_rule_serialize, | |
421 | condition->parent.equal = lttng_condition_event_rule_is_equal, | |
422 | condition->parent.destroy = lttng_condition_event_rule_destroy, | |
423 | ||
424 | lttng_event_rule_get(rule); | |
425 | ||
426 | condition->rule = rule; | |
427 | lttng_dynamic_pointer_array_init(&condition->capture_descriptors, | |
428 | destroy_capture_descriptor); | |
429 | ||
430 | parent = &condition->parent; | |
431 | end: | |
432 | return parent; | |
433 | } | |
434 | ||
435 | static | |
436 | int64_t int_from_buffer(const struct lttng_buffer_view *view, size_t size, | |
437 | size_t *offset) | |
438 | { | |
439 | int64_t ret; | |
440 | ||
441 | if (*offset + size > view->size) { | |
442 | ret = -1; | |
443 | goto end; | |
444 | } | |
445 | ||
446 | switch (size) { | |
447 | case 1: | |
448 | ret = (int64_t) view->data[*offset]; | |
449 | break; | |
450 | case sizeof(int32_t): | |
451 | { | |
452 | int32_t s32; | |
453 | ||
454 | memcpy(&s32, &view->data[*offset], sizeof(s32)); | |
455 | ret = (int64_t) s32; | |
456 | break; | |
457 | } | |
458 | case sizeof(ret): | |
459 | memcpy(&ret, &view->data[*offset], sizeof(ret)); | |
460 | break; | |
461 | default: | |
462 | abort(); | |
463 | } | |
464 | ||
465 | *offset += size; | |
466 | ||
467 | end: | |
468 | return ret; | |
469 | } | |
470 | static | |
471 | uint64_t uint_from_buffer(const struct lttng_buffer_view *view, size_t size, | |
472 | size_t *offset) | |
473 | { | |
474 | uint64_t ret; | |
475 | ||
476 | if (*offset + size > view->size) { | |
477 | ret = UINT64_C(-1); | |
478 | goto end; | |
479 | } | |
480 | ||
481 | switch (size) { | |
482 | case 1: | |
483 | ret = (uint64_t) view->data[*offset]; | |
484 | break; | |
485 | case sizeof(uint32_t): | |
486 | { | |
487 | uint32_t u32; | |
488 | ||
489 | memcpy(&u32, &view->data[*offset], sizeof(u32)); | |
490 | ret = (uint64_t) u32; | |
491 | break; | |
492 | } | |
493 | case sizeof(ret): | |
494 | memcpy(&ret, &view->data[*offset], sizeof(ret)); | |
495 | break; | |
496 | default: | |
497 | abort(); | |
498 | } | |
499 | ||
500 | *offset += size; | |
501 | ||
502 | end: | |
503 | return ret; | |
504 | } | |
505 | ||
506 | static | |
507 | const char *str_from_buffer(const struct lttng_buffer_view *view, | |
508 | size_t *offset) | |
509 | { | |
510 | uint64_t len; | |
511 | const char *ret; | |
512 | ||
513 | len = uint_from_buffer(view, sizeof(uint32_t), offset); | |
514 | if (len == UINT64_C(-1)) { | |
515 | goto error; | |
516 | } | |
517 | ||
518 | ret = &view->data[*offset]; | |
519 | ||
520 | if (!lttng_buffer_view_contains_string(view, ret, len)) { | |
521 | goto error; | |
522 | } | |
523 | ||
524 | *offset += len; | |
525 | goto end; | |
526 | ||
527 | error: | |
528 | ret = NULL; | |
529 | ||
530 | end: | |
531 | return ret; | |
532 | } | |
533 | ||
534 | static | |
535 | struct lttng_event_expr *event_expr_from_payload( | |
536 | struct lttng_payload_view *view, size_t *offset) | |
537 | { | |
538 | struct lttng_event_expr *expr = NULL; | |
539 | const char *str; | |
540 | uint64_t type; | |
541 | ||
542 | type = uint_from_buffer(&view->buffer, sizeof(uint8_t), offset); | |
543 | if (type == UINT64_C(-1)) { | |
544 | goto error; | |
545 | } | |
546 | ||
547 | switch (type) { | |
548 | case LTTNG_EVENT_EXPR_TYPE_EVENT_PAYLOAD_FIELD: | |
549 | str = str_from_buffer(&view->buffer, offset); | |
550 | if (!str) { | |
551 | goto error; | |
552 | } | |
553 | ||
554 | expr = lttng_event_expr_event_payload_field_create(str); | |
555 | break; | |
556 | case LTTNG_EVENT_EXPR_TYPE_CHANNEL_CONTEXT_FIELD: | |
557 | str = str_from_buffer(&view->buffer, offset); | |
558 | if (!str) { | |
559 | goto error; | |
560 | } | |
561 | ||
562 | expr = lttng_event_expr_channel_context_field_create(str); | |
563 | break; | |
564 | case LTTNG_EVENT_EXPR_TYPE_APP_SPECIFIC_CONTEXT_FIELD: | |
565 | { | |
566 | const char *provider_name; | |
567 | const char *type_name; | |
568 | ||
569 | provider_name = str_from_buffer(&view->buffer, offset); | |
570 | if (!provider_name) { | |
571 | goto error; | |
572 | } | |
573 | ||
574 | type_name = str_from_buffer(&view->buffer, offset); | |
575 | if (!type_name) { | |
576 | goto error; | |
577 | } | |
578 | ||
579 | expr = lttng_event_expr_app_specific_context_field_create( | |
580 | provider_name, type_name); | |
581 | break; | |
582 | } | |
583 | case LTTNG_EVENT_EXPR_TYPE_ARRAY_FIELD_ELEMENT: | |
584 | { | |
585 | struct lttng_event_expr *array_field_expr; | |
586 | uint64_t index; | |
587 | ||
588 | index = uint_from_buffer(&view->buffer, sizeof(uint32_t), offset); | |
589 | if (index == UINT64_C(-1)) { | |
590 | goto error; | |
591 | } | |
592 | ||
593 | /* Array field expression is the encoded after this */ | |
594 | array_field_expr = event_expr_from_payload(view, offset); | |
595 | if (!array_field_expr) { | |
596 | goto error; | |
597 | } | |
598 | ||
599 | /* Move ownership of `array_field_expr` to new expression */ | |
600 | expr = lttng_event_expr_array_field_element_create( | |
601 | array_field_expr, (unsigned int) index); | |
602 | if (!expr) { | |
603 | /* `array_field_expr` not moved: destroy it */ | |
604 | lttng_event_expr_destroy(array_field_expr); | |
605 | } | |
606 | ||
607 | break; | |
608 | } | |
609 | default: | |
610 | abort(); | |
611 | } | |
612 | ||
613 | goto end; | |
614 | ||
615 | error: | |
616 | lttng_event_expr_destroy(expr); | |
617 | expr = NULL; | |
618 | ||
619 | end: | |
620 | return expr; | |
621 | } | |
622 | ||
623 | LTTNG_HIDDEN | |
624 | ssize_t lttng_condition_event_rule_create_from_payload( | |
625 | struct lttng_payload_view *view, | |
626 | struct lttng_condition **_condition) | |
627 | { | |
628 | ssize_t consumed_length; | |
629 | size_t offset = 0; | |
630 | ssize_t size; | |
631 | uint64_t capture_descr_count; | |
632 | uint64_t i; | |
633 | struct lttng_condition *condition = NULL; | |
634 | struct lttng_event_rule *event_rule = NULL; | |
635 | ||
636 | if (!view || !_condition) { | |
637 | goto error; | |
638 | } | |
639 | ||
640 | /* Struct lttng_event_rule */ | |
641 | { | |
642 | struct lttng_payload_view event_rule_view = | |
643 | lttng_payload_view_from_view(view, offset, -1); | |
644 | size = lttng_event_rule_create_from_payload( | |
645 | &event_rule_view, &event_rule); | |
646 | } | |
647 | ||
648 | if (size < 0 || !event_rule) { | |
649 | goto error; | |
650 | } | |
651 | ||
652 | /* Create condition (no capture descriptors yet) at this point */ | |
653 | condition = lttng_condition_event_rule_create(event_rule); | |
654 | if (!condition) { | |
655 | goto error; | |
656 | } | |
657 | ||
658 | ||
659 | /* Capture descriptor count */ | |
660 | assert(size >= 0); | |
661 | offset += (size_t) size; | |
662 | capture_descr_count = uint_from_buffer(&view->buffer, sizeof(uint32_t), &offset); | |
663 | if (capture_descr_count == UINT64_C(-1)) { | |
664 | goto error; | |
665 | } | |
666 | ||
667 | /* Capture descriptors */ | |
668 | for (i = 0; i < capture_descr_count; i++) { | |
669 | enum lttng_condition_status status; | |
670 | struct lttng_capture_descriptor *desc; | |
671 | struct lttng_event_expr *expr = event_expr_from_payload( | |
672 | view, &offset); | |
673 | int32_t payload_index = int_from_buffer(&view->buffer, sizeof(int32_t), | |
674 | &offset); | |
675 | ||
676 | if (!expr) { | |
677 | goto error; | |
678 | } | |
679 | ||
680 | /* Move ownership of `expr` to `condition` */ | |
681 | status = lttng_condition_event_rule_append_capture_descriptor( | |
682 | condition, expr); | |
683 | if (status != LTTNG_CONDITION_STATUS_OK) { | |
684 | /* `expr` not moved: destroy it */ | |
685 | lttng_event_expr_destroy(expr); | |
686 | goto error; | |
687 | } | |
688 | ||
689 | /* | |
690 | * Set the internal payload object for the descriptor. This can | |
691 | * be used by liblttng-ctl to access capture msgpack payload on | |
692 | * the client side. | |
693 | */ | |
694 | desc = lttng_condition_event_rule_get_internal_capture_descriptor_at_index(condition, i); | |
695 | if (desc == NULL) { | |
696 | goto error; | |
697 | } | |
698 | desc->capture_index = payload_index; | |
699 | } | |
700 | ||
701 | consumed_length = (ssize_t) offset; | |
702 | *_condition = condition; | |
703 | condition = NULL; | |
704 | goto end; | |
705 | ||
706 | error: | |
707 | consumed_length = -1; | |
708 | ||
709 | end: | |
710 | lttng_event_rule_destroy(event_rule); | |
711 | lttng_condition_destroy(condition); | |
712 | return consumed_length; | |
713 | } | |
714 | ||
715 | LTTNG_HIDDEN | |
716 | enum lttng_condition_status lttng_condition_event_rule_get_rule_mutable( | |
717 | const struct lttng_condition *condition, | |
718 | struct lttng_event_rule **rule) | |
719 | { | |
720 | struct lttng_condition_event_rule *event_rule; | |
721 | enum lttng_condition_status status = LTTNG_CONDITION_STATUS_OK; | |
722 | ||
723 | if (!condition || !IS_EVENT_RULE_CONDITION(condition) || !rule) { | |
724 | status = LTTNG_CONDITION_STATUS_INVALID; | |
725 | goto end; | |
726 | } | |
727 | ||
728 | event_rule = container_of( | |
729 | condition, struct lttng_condition_event_rule, parent); | |
730 | if (!event_rule->rule) { | |
731 | status = LTTNG_CONDITION_STATUS_UNSET; | |
732 | goto end; | |
733 | } | |
734 | *rule = event_rule->rule; | |
735 | end: | |
736 | return status; | |
737 | } | |
738 | ||
739 | enum lttng_condition_status lttng_condition_event_rule_get_rule( | |
740 | const struct lttng_condition *condition, | |
741 | const struct lttng_event_rule **rule) | |
742 | { | |
743 | struct lttng_event_rule *mutable_rule = NULL; | |
744 | enum lttng_condition_status status; | |
745 | ||
746 | status = lttng_condition_event_rule_get_rule_mutable( | |
747 | condition, &mutable_rule); | |
748 | *rule = mutable_rule; | |
749 | return status; | |
750 | } | |
751 | ||
752 | enum lttng_condition_status | |
753 | lttng_condition_event_rule_append_capture_descriptor( | |
754 | struct lttng_condition *condition, | |
755 | struct lttng_event_expr *expr) | |
756 | { | |
757 | enum lttng_condition_status status = LTTNG_CONDITION_STATUS_OK; | |
758 | struct lttng_condition_event_rule *event_rule_cond = | |
759 | container_of(condition, | |
760 | struct lttng_condition_event_rule, parent); | |
761 | int ret; | |
762 | struct lttng_capture_descriptor *descriptor = NULL; | |
763 | const struct lttng_event_rule *rule = NULL; | |
764 | ||
765 | /* Only accept l-values */ | |
766 | if (!condition || !IS_EVENT_RULE_CONDITION(condition) || !expr || | |
767 | !lttng_event_expr_is_lvalue(expr)) { | |
768 | status = LTTNG_CONDITION_STATUS_INVALID; | |
769 | goto end; | |
770 | } | |
771 | ||
772 | status = lttng_condition_event_rule_get_rule(condition, &rule); | |
773 | if (status != LTTNG_CONDITION_STATUS_OK) { | |
774 | goto end; | |
775 | } | |
776 | ||
777 | switch(lttng_event_rule_get_type(rule)) { | |
778 | case LTTNG_EVENT_RULE_TYPE_TRACEPOINT: | |
779 | case LTTNG_EVENT_RULE_TYPE_SYSCALL: | |
780 | /* Supported */ | |
781 | status = LTTNG_CONDITION_STATUS_OK; | |
782 | break; | |
783 | case LTTNG_EVENT_RULE_TYPE_UNKNOWN: | |
784 | status = LTTNG_CONDITION_STATUS_INVALID; | |
785 | break; | |
786 | default: | |
787 | status = LTTNG_CONDITION_STATUS_UNSUPPORTED; | |
788 | break; | |
789 | } | |
790 | ||
791 | if (status != LTTNG_CONDITION_STATUS_OK) { | |
792 | goto end; | |
793 | } | |
794 | ||
795 | descriptor = malloc(sizeof(*descriptor)); | |
796 | if (descriptor == NULL) { | |
797 | status = LTTNG_CONDITION_STATUS_ERROR; | |
798 | goto end; | |
799 | } | |
800 | ||
801 | descriptor->capture_index = -1; | |
802 | descriptor->event_expression = expr; | |
803 | ||
804 | ret = lttng_dynamic_pointer_array_add_pointer( | |
805 | &event_rule_cond->capture_descriptors, descriptor); | |
806 | if (ret) { | |
807 | status = LTTNG_CONDITION_STATUS_ERROR; | |
808 | goto end; | |
809 | } | |
810 | ||
811 | /* Ownership is transfered to the internal capture_descriptors array */ | |
812 | descriptor = NULL; | |
813 | end: | |
814 | free(descriptor); | |
815 | return status; | |
816 | } | |
817 | ||
818 | enum lttng_condition_status | |
819 | lttng_condition_event_rule_get_capture_descriptor_count( | |
820 | const struct lttng_condition *condition, unsigned int *count) | |
821 | { | |
822 | enum lttng_condition_status status = LTTNG_CONDITION_STATUS_OK; | |
823 | const struct lttng_condition_event_rule *event_rule_cond = | |
824 | container_of(condition, | |
825 | const struct lttng_condition_event_rule, | |
826 | parent); | |
827 | ||
828 | if (!condition || !IS_EVENT_RULE_CONDITION(condition) || !count) { | |
829 | status = LTTNG_CONDITION_STATUS_INVALID; | |
830 | goto end; | |
831 | } | |
832 | ||
833 | *count = lttng_dynamic_pointer_array_get_count( | |
834 | &event_rule_cond->capture_descriptors); | |
835 | ||
836 | end: | |
837 | return status; | |
838 | } | |
839 | ||
840 | const struct lttng_event_expr * | |
841 | lttng_condition_event_rule_get_capture_descriptor_at_index( | |
842 | const struct lttng_condition *condition, unsigned int index) | |
843 | { | |
844 | const struct lttng_event_expr *expr = NULL; | |
845 | const struct lttng_capture_descriptor *desc = NULL; | |
846 | ||
847 | desc = lttng_condition_event_rule_get_internal_capture_descriptor_at_index( | |
848 | condition, index); | |
849 | if (desc == NULL) { | |
850 | goto end; | |
851 | } | |
852 | expr = desc->event_expression; | |
853 | ||
854 | end: | |
855 | return expr; | |
856 | } | |
857 | ||
858 | LTTNG_HIDDEN | |
859 | ssize_t lttng_evaluation_event_rule_create_from_payload( | |
860 | const struct lttng_condition_event_rule *condition, | |
861 | struct lttng_payload_view *view, | |
862 | struct lttng_evaluation **_evaluation) | |
863 | { | |
864 | ssize_t ret, offset = 0; | |
865 | const char *name; | |
866 | struct lttng_evaluation *evaluation = NULL; | |
867 | const struct lttng_evaluation_event_rule_comm *comm = | |
868 | (const struct lttng_evaluation_event_rule_comm *) | |
869 | view->buffer.data; | |
870 | uint32_t capture_payload_size; | |
871 | const char *capture_payload = NULL; | |
872 | ||
873 | if (!_evaluation) { | |
874 | ret = -1; | |
875 | goto error; | |
876 | } | |
877 | ||
878 | if (view->buffer.size < sizeof(*comm)) { | |
879 | ret = -1; | |
880 | goto error; | |
881 | } | |
882 | ||
883 | /* Map the name, view of the payload */ | |
884 | offset += sizeof(*comm); | |
885 | { | |
886 | struct lttng_payload_view current_view = | |
887 | lttng_payload_view_from_view(view, offset, | |
888 | comm->trigger_name_length); | |
889 | name = current_view.buffer.data; | |
890 | if (!name) { | |
891 | ret = -1; | |
892 | goto error; | |
893 | } | |
894 | ||
895 | if (!lttng_buffer_view_contains_string(¤t_view.buffer, | |
896 | name, comm->trigger_name_length)) { | |
897 | ret = -1; | |
898 | goto error; | |
899 | } | |
900 | } | |
901 | ||
902 | offset += comm->trigger_name_length; | |
903 | { | |
904 | struct lttng_payload_view current_view = lttng_payload_view_from_view(view, offset, -1); | |
905 | ||
906 | if (current_view.buffer.size < sizeof(capture_payload_size)) { | |
907 | ret = -1; | |
908 | goto error; | |
909 | } | |
910 | ||
911 | memcpy(&capture_payload_size, current_view.buffer.data, | |
912 | sizeof(capture_payload_size)); | |
913 | } | |
914 | offset += sizeof(capture_payload_size); | |
915 | ||
916 | if (capture_payload_size > 0) { | |
917 | struct lttng_payload_view current_view = lttng_payload_view_from_view(view, offset, -1); | |
918 | ||
919 | if (current_view.buffer.size < capture_payload_size) { | |
920 | ret = -1; | |
921 | goto error; | |
922 | } | |
923 | ||
924 | capture_payload = current_view.buffer.data; | |
925 | } | |
926 | ||
927 | evaluation = lttng_evaluation_event_rule_create(condition, name, | |
928 | capture_payload, capture_payload_size, true); | |
929 | if (!evaluation) { | |
930 | ret = -1; | |
931 | goto error; | |
932 | } | |
933 | ||
934 | offset += capture_payload_size; | |
935 | *_evaluation = evaluation; | |
936 | evaluation = NULL; | |
937 | ret = offset; | |
938 | ||
939 | error: | |
940 | lttng_evaluation_destroy(evaluation); | |
941 | return ret; | |
942 | } | |
943 | ||
944 | static int lttng_evaluation_event_rule_serialize( | |
945 | const struct lttng_evaluation *evaluation, | |
946 | struct lttng_payload *payload) | |
947 | { | |
948 | int ret = 0; | |
949 | struct lttng_evaluation_event_rule *hit; | |
950 | struct lttng_evaluation_event_rule_comm comm; | |
951 | uint32_t capture_payload_size; | |
952 | ||
953 | hit = container_of( | |
954 | evaluation, struct lttng_evaluation_event_rule, parent); | |
955 | comm.trigger_name_length = strlen(hit->name) + 1; | |
956 | ret = lttng_dynamic_buffer_append( | |
957 | &payload->buffer, &comm, sizeof(comm)); | |
958 | if (ret) { | |
959 | goto end; | |
960 | } | |
961 | ret = lttng_dynamic_buffer_append( | |
962 | &payload->buffer, hit->name, comm.trigger_name_length); | |
963 | if (ret) { | |
964 | goto end; | |
965 | } | |
966 | ||
967 | capture_payload_size = (uint32_t) hit->capture_payload.size; | |
968 | ret = lttng_dynamic_buffer_append(&payload->buffer, &capture_payload_size, | |
969 | sizeof(capture_payload_size)); | |
970 | if (ret) { | |
971 | goto end; | |
972 | } | |
973 | ||
974 | ret = lttng_dynamic_buffer_append(&payload->buffer, hit->capture_payload.data, | |
975 | hit->capture_payload.size); | |
976 | if (ret) { | |
977 | goto end; | |
978 | } | |
979 | ||
980 | end: | |
981 | return ret; | |
982 | } | |
983 | ||
984 | static | |
985 | bool msgpack_str_is_equal(const struct msgpack_object *obj, const char *str) | |
986 | { | |
987 | bool is_equal = true; | |
988 | ||
989 | assert(obj->type == MSGPACK_OBJECT_STR); | |
990 | ||
991 | if (obj->via.str.size != strlen(str)) { | |
992 | is_equal = false; | |
993 | goto end; | |
994 | } | |
995 | ||
996 | if (strncmp(obj->via.str.ptr, str, obj->via.str.size) != 0) { | |
997 | is_equal = false; | |
998 | goto end; | |
999 | } | |
1000 | ||
1001 | end: | |
1002 | return is_equal; | |
1003 | } | |
1004 | ||
1005 | static | |
1006 | const msgpack_object *get_msgpack_map_obj(const struct msgpack_object *map_obj, | |
1007 | const char *name) | |
1008 | { | |
1009 | const msgpack_object *ret = NULL; | |
1010 | size_t i; | |
1011 | ||
1012 | assert(map_obj->type == MSGPACK_OBJECT_MAP); | |
1013 | ||
1014 | for (i = 0; i < map_obj->via.map.size; i++) { | |
1015 | const struct msgpack_object_kv *kv = &map_obj->via.map.ptr[i]; | |
1016 | ||
1017 | assert(kv->key.type == MSGPACK_OBJECT_STR); | |
1018 | ||
1019 | if (msgpack_str_is_equal(&kv->key, name)) { | |
1020 | ret = &kv->val; | |
1021 | goto end; | |
1022 | } | |
1023 | } | |
1024 | ||
1025 | end: | |
1026 | return ret; | |
1027 | } | |
1028 | ||
1029 | static void lttng_evaluation_event_rule_destroy( | |
1030 | struct lttng_evaluation *evaluation) | |
1031 | { | |
1032 | struct lttng_evaluation_event_rule *hit; | |
1033 | ||
1034 | hit = container_of( | |
1035 | evaluation, struct lttng_evaluation_event_rule, parent); | |
1036 | free(hit->name); | |
1037 | lttng_dynamic_buffer_reset(&hit->capture_payload); | |
1038 | if (hit->captured_values) { | |
1039 | lttng_event_field_value_destroy(hit->captured_values); | |
1040 | } | |
1041 | free(hit); | |
1042 | } | |
1043 | ||
1044 | static | |
1045 | int event_field_value_from_obj(const msgpack_object *obj, | |
1046 | struct lttng_event_field_value **field_val) | |
1047 | { | |
1048 | assert(obj); | |
1049 | assert(field_val); | |
1050 | int ret = 0; | |
1051 | ||
1052 | switch (obj->type) { | |
1053 | case MSGPACK_OBJECT_NIL: | |
1054 | /* Unavailable */ | |
1055 | *field_val = NULL; | |
1056 | goto end; | |
1057 | case MSGPACK_OBJECT_POSITIVE_INTEGER: | |
1058 | *field_val = lttng_event_field_value_uint_create( | |
1059 | obj->via.u64); | |
1060 | break; | |
1061 | case MSGPACK_OBJECT_NEGATIVE_INTEGER: | |
1062 | *field_val = lttng_event_field_value_int_create( | |
1063 | obj->via.i64); | |
1064 | break; | |
1065 | case MSGPACK_OBJECT_FLOAT32: | |
1066 | case MSGPACK_OBJECT_FLOAT64: | |
1067 | *field_val = lttng_event_field_value_real_create( | |
1068 | obj->via.f64); | |
1069 | break; | |
1070 | case MSGPACK_OBJECT_STR: | |
1071 | *field_val = lttng_event_field_value_string_create_with_size( | |
1072 | obj->via.str.ptr, obj->via.str.size); | |
1073 | break; | |
1074 | case MSGPACK_OBJECT_ARRAY: | |
1075 | { | |
1076 | size_t i; | |
1077 | ||
1078 | *field_val = lttng_event_field_value_array_create(); | |
1079 | if (!*field_val) { | |
1080 | goto error; | |
1081 | } | |
1082 | ||
1083 | for (i = 0; i < obj->via.array.size; i++) { | |
1084 | const msgpack_object *elem_obj = &obj->via.array.ptr[i]; | |
1085 | struct lttng_event_field_value *elem_field_val; | |
1086 | ||
1087 | ret = event_field_value_from_obj(elem_obj, | |
1088 | &elem_field_val); | |
1089 | ||
1090 | if (ret) { | |
1091 | goto error; | |
1092 | } | |
1093 | ||
1094 | if (elem_field_val) { | |
1095 | ret = lttng_event_field_value_array_append( | |
1096 | *field_val, elem_field_val); | |
1097 | } else { | |
1098 | ret = lttng_event_field_value_array_append_unavailable( | |
1099 | *field_val); | |
1100 | } | |
1101 | ||
1102 | if (ret) { | |
1103 | lttng_event_field_value_destroy(elem_field_val); | |
1104 | goto error; | |
1105 | } | |
1106 | } | |
1107 | ||
1108 | break; | |
1109 | } | |
1110 | case MSGPACK_OBJECT_MAP: | |
1111 | { | |
1112 | /* | |
1113 | * As of this version, the only valid map object is | |
1114 | * for an enumeration value, for example: | |
1115 | * | |
1116 | * type: enum | |
1117 | * value: 177 | |
1118 | * labels: | |
1119 | * - Labatt 50 | |
1120 | * - Molson Dry | |
1121 | * - Carling Black Label | |
1122 | */ | |
1123 | const msgpack_object *inner_obj; | |
1124 | size_t label_i; | |
1125 | ||
1126 | inner_obj = get_msgpack_map_obj(obj, "type"); | |
1127 | if (!inner_obj) { | |
1128 | ERR("Missing `type` entry in map object."); | |
1129 | goto error; | |
1130 | } | |
1131 | ||
1132 | if (inner_obj->type != MSGPACK_OBJECT_STR) { | |
1133 | ERR("Map object's `type` entry is not a string (it's a %d).", | |
1134 | inner_obj->type); | |
1135 | goto error; | |
1136 | } | |
1137 | ||
1138 | if (!msgpack_str_is_equal(inner_obj, "enum")) { | |
1139 | ERR("Map object's `type` entry: expecting `enum`."); | |
1140 | goto error; | |
1141 | } | |
1142 | ||
1143 | inner_obj = get_msgpack_map_obj(obj, "value"); | |
1144 | if (!inner_obj) { | |
1145 | ERR("Missing `value` entry in map object."); | |
1146 | goto error; | |
1147 | } | |
1148 | ||
1149 | if (inner_obj->type == MSGPACK_OBJECT_POSITIVE_INTEGER) { | |
1150 | *field_val = lttng_event_field_value_enum_uint_create( | |
1151 | inner_obj->via.u64); | |
1152 | } else if (inner_obj->type == MSGPACK_OBJECT_NEGATIVE_INTEGER) { | |
1153 | *field_val = lttng_event_field_value_enum_int_create( | |
1154 | inner_obj->via.i64); | |
1155 | } else { | |
1156 | ERR("Map object's `value` entry is not an integer (it's a %d).", | |
1157 | inner_obj->type); | |
1158 | goto error; | |
1159 | } | |
1160 | ||
1161 | if (!*field_val) { | |
1162 | goto error; | |
1163 | } | |
1164 | ||
1165 | inner_obj = get_msgpack_map_obj(obj, "labels"); | |
1166 | if (!inner_obj) { | |
1167 | /* No labels */ | |
1168 | goto end; | |
1169 | } | |
1170 | ||
1171 | if (inner_obj->type != MSGPACK_OBJECT_ARRAY) { | |
1172 | ERR("Map object's `labels` entry is not an array (it's a %d).", | |
1173 | inner_obj->type); | |
1174 | goto error; | |
1175 | } | |
1176 | ||
1177 | for (label_i = 0; label_i < inner_obj->via.array.size; | |
1178 | label_i++) { | |
1179 | int iret; | |
1180 | const msgpack_object *elem_obj = | |
1181 | &inner_obj->via.array.ptr[label_i]; | |
1182 | ||
1183 | if (elem_obj->type != MSGPACK_OBJECT_STR) { | |
1184 | ERR("Map object's `labels` entry's type is not a string (it's a %d).", | |
1185 | elem_obj->type); | |
1186 | goto error; | |
1187 | } | |
1188 | ||
1189 | iret = lttng_event_field_value_enum_append_label_with_size( | |
1190 | *field_val, elem_obj->via.str.ptr, | |
1191 | elem_obj->via.str.size); | |
1192 | if (iret) { | |
1193 | goto error; | |
1194 | } | |
1195 | } | |
1196 | ||
1197 | break; | |
1198 | } | |
1199 | default: | |
1200 | ERR("Unexpected object type %d.", obj->type); | |
1201 | goto error; | |
1202 | } | |
1203 | ||
1204 | if (!*field_val) { | |
1205 | goto error; | |
1206 | } | |
1207 | ||
1208 | goto end; | |
1209 | ||
1210 | error: | |
1211 | lttng_event_field_value_destroy(*field_val); | |
1212 | *field_val = NULL; | |
1213 | ret = -1; | |
1214 | ||
1215 | end: | |
1216 | return ret; | |
1217 | } | |
1218 | ||
1219 | static | |
1220 | struct lttng_event_field_value *event_field_value_from_capture_payload( | |
1221 | const struct lttng_condition_event_rule *condition, | |
1222 | const char *capture_payload, size_t capture_payload_size) | |
1223 | { | |
1224 | struct lttng_event_field_value *ret = NULL; | |
1225 | msgpack_unpacked unpacked; | |
1226 | msgpack_unpack_return unpack_return; | |
1227 | const msgpack_object *root_obj; | |
1228 | const msgpack_object_array *root_array_obj; | |
1229 | size_t i; | |
1230 | size_t count; | |
1231 | ||
1232 | assert(condition); | |
1233 | assert(capture_payload); | |
1234 | ||
1235 | /* Initialize value */ | |
1236 | msgpack_unpacked_init(&unpacked); | |
1237 | ||
1238 | /* Decode */ | |
1239 | unpack_return = msgpack_unpack_next(&unpacked, capture_payload, | |
1240 | capture_payload_size, NULL); | |
1241 | if (unpack_return != MSGPACK_UNPACK_SUCCESS) { | |
1242 | ERR("msgpack_unpack_next() failed to decode the " | |
1243 | "MessagePack-encoded capture payload " | |
1244 | "(size %zu); returned %d.", | |
1245 | capture_payload_size, unpack_return); | |
1246 | goto error; | |
1247 | } | |
1248 | ||
1249 | /* Get root array */ | |
1250 | root_obj = &unpacked.data; | |
1251 | ||
1252 | if (root_obj->type != MSGPACK_OBJECT_ARRAY) { | |
1253 | ERR("Expecting an array as the root object; got type %d.", | |
1254 | root_obj->type); | |
1255 | goto error; | |
1256 | } | |
1257 | ||
1258 | root_array_obj = &root_obj->via.array; | |
1259 | ||
1260 | /* Create an empty root array event field value */ | |
1261 | ret = lttng_event_field_value_array_create(); | |
1262 | if (!ret) { | |
1263 | goto error; | |
1264 | } | |
1265 | ||
1266 | /* | |
1267 | * For each capture descriptor in the condition object: | |
1268 | * | |
1269 | * 1. Get its corresponding captured field value MessagePack | |
1270 | * object. | |
1271 | * | |
1272 | * 2. Create a corresponding event field value. | |
1273 | * | |
1274 | * 3. Append it to `ret` (the root array event field value). | |
1275 | */ | |
1276 | count = lttng_dynamic_pointer_array_get_count( | |
1277 | &condition->capture_descriptors); | |
1278 | assert(count > 0); | |
1279 | ||
1280 | for (i = 0; i < count; i++) { | |
1281 | const struct lttng_capture_descriptor *capture_descriptor = | |
1282 | lttng_condition_event_rule_get_internal_capture_descriptor_at_index( | |
1283 | &condition->parent, i); | |
1284 | const msgpack_object *elem_obj; | |
1285 | struct lttng_event_field_value *elem_field_val; | |
1286 | int iret; | |
1287 | ||
1288 | assert(capture_descriptor); | |
1289 | assert(capture_descriptor->capture_index >= 0); | |
1290 | ||
1291 | if (capture_descriptor->capture_index >= root_array_obj->size) { | |
1292 | ERR("Root array object of size %u does not have enough " | |
1293 | "elements for the capture index %u " | |
1294 | "(for capture descriptor #%zu).", | |
1295 | (unsigned int) root_array_obj->size, | |
1296 | (unsigned int) capture_descriptor->capture_index, | |
1297 | i); | |
1298 | goto error; | |
1299 | } | |
1300 | ||
1301 | elem_obj = &root_array_obj->ptr[(size_t) capture_descriptor->capture_index]; | |
1302 | iret = event_field_value_from_obj(elem_obj, | |
1303 | &elem_field_val); | |
1304 | if (iret) { | |
1305 | goto error; | |
1306 | } | |
1307 | ||
1308 | if (elem_field_val) { | |
1309 | iret = lttng_event_field_value_array_append(ret, | |
1310 | elem_field_val); | |
1311 | } else { | |
1312 | iret = lttng_event_field_value_array_append_unavailable( | |
1313 | ret); | |
1314 | } | |
1315 | ||
1316 | if (iret) { | |
1317 | lttng_event_field_value_destroy(elem_field_val); | |
1318 | goto error; | |
1319 | } | |
1320 | } | |
1321 | ||
1322 | goto end; | |
1323 | ||
1324 | error: | |
1325 | lttng_event_field_value_destroy(ret); | |
1326 | ret = NULL; | |
1327 | ||
1328 | end: | |
1329 | msgpack_unpacked_destroy(&unpacked); | |
1330 | return ret; | |
1331 | } | |
1332 | ||
1333 | LTTNG_HIDDEN | |
1334 | struct lttng_evaluation *lttng_evaluation_event_rule_create( | |
1335 | const struct lttng_condition_event_rule *condition, | |
1336 | const char *trigger_name, | |
1337 | const char *capture_payload, size_t capture_payload_size, | |
1338 | bool decode_capture_payload) | |
1339 | { | |
1340 | struct lttng_evaluation_event_rule *hit; | |
1341 | struct lttng_evaluation *evaluation = NULL; | |
1342 | ||
1343 | hit = zmalloc(sizeof(struct lttng_evaluation_event_rule)); | |
1344 | if (!hit) { | |
1345 | goto error; | |
1346 | } | |
1347 | ||
1348 | hit->name = strdup(trigger_name); | |
1349 | if (!hit->name) { | |
1350 | goto error; | |
1351 | } | |
1352 | ||
1353 | lttng_dynamic_buffer_init(&hit->capture_payload); | |
1354 | ||
1355 | if (capture_payload) { | |
1356 | lttng_dynamic_buffer_append(&hit->capture_payload, | |
1357 | capture_payload, capture_payload_size); | |
1358 | ||
1359 | if (decode_capture_payload) { | |
1360 | hit->captured_values = | |
1361 | event_field_value_from_capture_payload( | |
1362 | condition, | |
1363 | capture_payload, | |
1364 | capture_payload_size); | |
1365 | if (!hit->captured_values) { | |
1366 | ERR("Failed to decode the capture payload (size %zu).", | |
1367 | capture_payload_size); | |
1368 | goto error; | |
1369 | } | |
1370 | } | |
1371 | } | |
1372 | ||
1373 | hit->parent.type = LTTNG_CONDITION_TYPE_EVENT_RULE_HIT; | |
1374 | hit->parent.serialize = lttng_evaluation_event_rule_serialize; | |
1375 | hit->parent.destroy = lttng_evaluation_event_rule_destroy; | |
1376 | ||
1377 | evaluation = &hit->parent; | |
1378 | hit = NULL; | |
1379 | ||
1380 | error: | |
1381 | if (hit) { | |
1382 | lttng_evaluation_event_rule_destroy(&hit->parent); | |
1383 | } | |
1384 | ||
1385 | return evaluation; | |
1386 | } | |
1387 | ||
1388 | enum lttng_evaluation_status lttng_evaluation_get_captured_values( | |
1389 | const struct lttng_evaluation *evaluation, | |
1390 | const struct lttng_event_field_value **field_val) | |
1391 | { | |
1392 | struct lttng_evaluation_event_rule *hit; | |
1393 | enum lttng_evaluation_status status = LTTNG_EVALUATION_STATUS_OK; | |
1394 | ||
1395 | if (!evaluation || !is_event_rule_evaluation(evaluation) || | |
1396 | !field_val) { | |
1397 | status = LTTNG_EVALUATION_STATUS_INVALID; | |
1398 | goto end; | |
1399 | } | |
1400 | ||
1401 | hit = container_of(evaluation, struct lttng_evaluation_event_rule, | |
1402 | parent); | |
1403 | if (!hit->captured_values) { | |
1404 | status = LTTNG_EVALUATION_STATUS_INVALID; | |
1405 | goto end; | |
1406 | } | |
1407 | ||
1408 | *field_val = hit->captured_values; | |
1409 | ||
1410 | end: | |
1411 | return status; | |
1412 | } | |
1413 | ||
1414 | enum lttng_evaluation_status lttng_evaluation_event_rule_get_trigger_name( | |
1415 | const struct lttng_evaluation *evaluation, const char **name) | |
1416 | { | |
1417 | struct lttng_evaluation_event_rule *hit; | |
1418 | enum lttng_evaluation_status status = LTTNG_EVALUATION_STATUS_OK; | |
1419 | ||
1420 | if (!evaluation || !is_event_rule_evaluation(evaluation) || !name) { | |
1421 | status = LTTNG_EVALUATION_STATUS_INVALID; | |
1422 | goto end; | |
1423 | } | |
1424 | ||
1425 | hit = container_of( | |
1426 | evaluation, struct lttng_evaluation_event_rule, parent); | |
1427 | *name = hit->name; | |
1428 | end: | |
1429 | return status; | |
1430 | } | |
1431 | ||
1432 | LTTNG_HIDDEN | |
1433 | enum lttng_error_code | |
1434 | lttng_condition_event_rule_generate_capture_descriptor_bytecode_set( | |
1435 | struct lttng_condition *condition, | |
1436 | struct lttng_dynamic_pointer_array *bytecode_set) | |
1437 | { | |
1438 | enum lttng_error_code ret; | |
1439 | enum lttng_condition_status status; | |
1440 | unsigned int capture_count; | |
1441 | const struct lttng_condition_event_rule_capture_bytecode_element *set_element; | |
1442 | struct lttng_capture_descriptor *local_capture_desc; | |
1443 | ssize_t set_count; | |
1444 | struct lttng_condition_event_rule_capture_bytecode_element *set_element_to_append = | |
1445 | NULL; | |
1446 | struct lttng_bytecode *bytecode = NULL; | |
1447 | ||
1448 | if (!condition || !IS_EVENT_RULE_CONDITION(condition) || | |
1449 | !bytecode_set) { | |
1450 | ret = LTTNG_ERR_FATAL; | |
1451 | goto end; | |
1452 | } | |
1453 | ||
1454 | status = lttng_condition_event_rule_get_capture_descriptor_count( | |
1455 | condition, &capture_count); | |
1456 | if (status != LTTNG_CONDITION_STATUS_OK) { | |
1457 | ret = LTTNG_ERR_FATAL; | |
1458 | goto end; | |
1459 | } | |
1460 | ||
1461 | /* | |
1462 | * O(n^2), don't care. This code path is not hot. | |
1463 | * Before inserting into the set, validate that the expression is not | |
1464 | * already present in it. | |
1465 | */ | |
1466 | for (unsigned int i = 0; i < capture_count; i++) { | |
1467 | int found_in_set = false; | |
1468 | ||
1469 | set_count = lttng_dynamic_pointer_array_get_count(bytecode_set); | |
1470 | ||
1471 | local_capture_desc = | |
1472 | lttng_condition_event_rule_get_internal_capture_descriptor_at_index( | |
1473 | condition, i); | |
1474 | if (local_capture_desc == NULL) { | |
1475 | ret = LTTNG_ERR_FATAL; | |
1476 | goto end; | |
1477 | } | |
1478 | ||
1479 | /* | |
1480 | * Iterate over the set to check if already present in the set. | |
1481 | */ | |
1482 | for (ssize_t j = 0; j < set_count; j++) { | |
1483 | set_element = (struct lttng_condition_event_rule_capture_bytecode_element | |
1484 | *) | |
1485 | lttng_dynamic_pointer_array_get_pointer( | |
1486 | bytecode_set, j); | |
1487 | if (set_element == NULL) { | |
1488 | ret = LTTNG_ERR_FATAL; | |
1489 | goto end; | |
1490 | } | |
1491 | ||
1492 | if (!lttng_event_expr_is_equal( | |
1493 | local_capture_desc->event_expression, | |
1494 | set_element->expression)) { | |
1495 | /* Check against next set element */ | |
1496 | continue; | |
1497 | } | |
1498 | ||
1499 | /* | |
1500 | * Already present in the set, assign the | |
1501 | * capture index of the capture descriptor for | |
1502 | * future use. | |
1503 | */ | |
1504 | found_in_set = true; | |
1505 | local_capture_desc->capture_index = j; | |
1506 | /* Exit inner loop */ | |
1507 | break; | |
1508 | } | |
1509 | ||
1510 | if (found_in_set) { | |
1511 | /* Process next local capture descriptor */ | |
1512 | continue; | |
1513 | } | |
1514 | ||
1515 | /* | |
1516 | * Not found in the set. | |
1517 | * Insert the capture descriptor in the set. | |
1518 | */ | |
1519 | set_element_to_append = malloc(sizeof(*set_element_to_append)); | |
1520 | if (set_element_to_append == NULL) { | |
1521 | ret = LTTNG_ERR_NOMEM; | |
1522 | goto end; | |
1523 | } | |
1524 | ||
1525 | /* Generate the bytecode */ | |
1526 | status = lttng_event_expr_to_bytecode( | |
1527 | local_capture_desc->event_expression, | |
1528 | &bytecode); | |
1529 | if (status < 0 || bytecode == NULL) { | |
1530 | /* TODO: return pertinent capture related error code */ | |
1531 | ret = LTTNG_ERR_FILTER_INVAL; | |
1532 | goto end; | |
1533 | } | |
1534 | ||
1535 | set_element_to_append->bytecode = bytecode; | |
1536 | ||
1537 | /* | |
1538 | * Ensure the lifetime of the event expression. | |
1539 | * Our reference will be put on condition destroy. | |
1540 | */ | |
1541 | lttng_event_expr_get(local_capture_desc->event_expression); | |
1542 | set_element_to_append->expression = | |
1543 | local_capture_desc->event_expression; | |
1544 | ||
1545 | ret = lttng_dynamic_pointer_array_add_pointer( | |
1546 | bytecode_set, set_element_to_append); | |
1547 | if (ret < 0) { | |
1548 | ret = LTTNG_ERR_NOMEM; | |
1549 | goto end; | |
1550 | } | |
1551 | ||
1552 | /* Ownership tranfered to the bytecode set */ | |
1553 | set_element_to_append = NULL; | |
1554 | bytecode = NULL; | |
1555 | ||
1556 | /* Assign the capture descriptor for future use */ | |
1557 | local_capture_desc->capture_index = set_count; | |
1558 | } | |
1559 | ||
1560 | /* Everything went better than expected */ | |
1561 | ret = LTTNG_OK; | |
1562 | ||
1563 | end: | |
1564 | free(set_element_to_append); | |
1565 | free(bytecode); | |
1566 | return ret; | |
1567 | } |