Commit | Line | Data |
---|---|---|
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 | ||
6fb7c690 JR |
195 | static |
196 | struct lttng_capture_descriptor * | |
197 | lttng_condition_event_rule_get_internal_capture_descriptor_at_index( | |
198 | const struct lttng_condition *condition, unsigned int index) | |
199 | { | |
200 | const struct lttng_condition_event_rule *event_rule_cond = | |
201 | container_of(condition, | |
202 | const struct lttng_condition_event_rule, | |
203 | parent); | |
204 | struct lttng_capture_descriptor *desc = NULL; | |
205 | unsigned int count; | |
206 | enum lttng_condition_status status; | |
207 | ||
208 | if (!condition || !IS_EVENT_RULE_CONDITION(condition)) { | |
209 | goto end; | |
210 | } | |
211 | ||
212 | status = lttng_condition_event_rule_get_capture_descriptor_count( | |
213 | condition, &count); | |
214 | if (status != LTTNG_CONDITION_STATUS_OK) { | |
215 | goto end; | |
216 | } | |
217 | ||
218 | if (index >= count) { | |
219 | goto end; | |
220 | } | |
221 | ||
222 | desc = lttng_dynamic_pointer_array_get_pointer( | |
223 | &event_rule_cond->capture_descriptors, index); | |
224 | end: | |
225 | return desc; | |
226 | } | |
227 | ||
683d081a JR |
228 | static int lttng_condition_event_rule_serialize( |
229 | const struct lttng_condition *condition, | |
230 | struct lttng_payload *payload) | |
231 | { | |
232 | int ret; | |
683d081a | 233 | struct lttng_condition_event_rule *event_rule; |
0912b5ea | 234 | enum lttng_condition_status status; |
38114013 PP |
235 | /* Used for iteration and communication (size matters). */ |
236 | uint32_t i, capture_descr_count; | |
683d081a JR |
237 | |
238 | if (!condition || !IS_EVENT_RULE_CONDITION(condition)) { | |
239 | ret = -1; | |
240 | goto end; | |
241 | } | |
242 | ||
243 | DBG("Serializing event rule condition"); | |
244 | event_rule = container_of( | |
245 | condition, struct lttng_condition_event_rule, parent); | |
246 | ||
38114013 PP |
247 | DBG("Serializing event rule condition's event rule"); |
248 | ret = lttng_event_rule_serialize(event_rule->rule, payload); | |
683d081a JR |
249 | if (ret) { |
250 | goto end; | |
251 | } | |
252 | ||
0912b5ea JR |
253 | status = lttng_condition_event_rule_get_capture_descriptor_count( |
254 | condition, &capture_descr_count); | |
255 | if (status != LTTNG_CONDITION_STATUS_OK) { | |
256 | ret = -1; | |
257 | goto end; | |
258 | }; | |
259 | ||
38114013 PP |
260 | DBG("Serializing event rule condition's capture descriptor count: %" PRIu32, |
261 | capture_descr_count); | |
262 | ret = lttng_dynamic_buffer_append(&payload->buffer, &capture_descr_count, | |
263 | sizeof(capture_descr_count)); | |
683d081a JR |
264 | if (ret) { |
265 | goto end; | |
266 | } | |
267 | ||
38114013 | 268 | for (i = 0; i < capture_descr_count; i++) { |
6fb7c690 JR |
269 | const struct lttng_capture_descriptor *desc = |
270 | lttng_condition_event_rule_get_internal_capture_descriptor_at_index( | |
0912b5ea | 271 | condition, i); |
38114013 PP |
272 | |
273 | DBG("Serializing event rule condition's capture descriptor %" PRIu32, | |
274 | i); | |
6fb7c690 | 275 | ret = serialize_event_expr(desc->event_expression, payload); |
38114013 PP |
276 | if (ret) { |
277 | goto end; | |
278 | } | |
279 | } | |
683d081a JR |
280 | |
281 | end: | |
282 | return ret; | |
283 | } | |
284 | ||
38114013 PP |
285 | static |
286 | bool capture_descriptors_are_equal( | |
0912b5ea JR |
287 | const struct lttng_condition *condition_a, |
288 | const struct lttng_condition *condition_b) | |
38114013 PP |
289 | { |
290 | bool is_equal = true; | |
0912b5ea JR |
291 | unsigned int capture_descr_count_a; |
292 | unsigned int capture_descr_count_b; | |
38114013 | 293 | size_t i; |
0912b5ea | 294 | enum lttng_condition_status status; |
38114013 | 295 | |
0912b5ea JR |
296 | status = lttng_condition_event_rule_get_capture_descriptor_count( |
297 | condition_a, &capture_descr_count_a); | |
298 | if (status != LTTNG_CONDITION_STATUS_OK) { | |
299 | goto not_equal; | |
300 | } | |
301 | ||
302 | status = lttng_condition_event_rule_get_capture_descriptor_count( | |
303 | condition_b, &capture_descr_count_b); | |
304 | if (status != LTTNG_CONDITION_STATUS_OK) { | |
305 | goto not_equal; | |
306 | } | |
38114013 PP |
307 | |
308 | if (capture_descr_count_a != capture_descr_count_b) { | |
309 | goto not_equal; | |
310 | } | |
311 | ||
312 | for (i = 0; i < capture_descr_count_a; i++) { | |
313 | const struct lttng_event_expr *expr_a = | |
0912b5ea JR |
314 | lttng_condition_event_rule_get_capture_descriptor_at_index( |
315 | condition_a, | |
38114013 PP |
316 | i); |
317 | const struct lttng_event_expr *expr_b = | |
0912b5ea JR |
318 | lttng_condition_event_rule_get_capture_descriptor_at_index( |
319 | condition_b, | |
38114013 PP |
320 | i); |
321 | ||
322 | if (!lttng_event_expr_is_equal(expr_a, expr_b)) { | |
323 | goto not_equal; | |
324 | } | |
325 | } | |
326 | ||
327 | goto end; | |
328 | ||
329 | not_equal: | |
330 | is_equal = false; | |
331 | ||
332 | end: | |
333 | return is_equal; | |
334 | } | |
335 | ||
683d081a JR |
336 | static bool lttng_condition_event_rule_is_equal( |
337 | const struct lttng_condition *_a, | |
338 | const struct lttng_condition *_b) | |
339 | { | |
340 | bool is_equal = false; | |
341 | struct lttng_condition_event_rule *a, *b; | |
342 | ||
343 | a = container_of(_a, struct lttng_condition_event_rule, parent); | |
344 | b = container_of(_b, struct lttng_condition_event_rule, parent); | |
345 | ||
346 | /* Both event rules must be set or both must be unset. */ | |
347 | if ((a->rule && !b->rule) || (!a->rule && b->rule)) { | |
348 | WARN("Comparing event_rule conditions with uninitialized rule"); | |
349 | goto end; | |
350 | } | |
351 | ||
352 | is_equal = lttng_event_rule_is_equal(a->rule, b->rule); | |
38114013 PP |
353 | if (!is_equal) { |
354 | goto end; | |
355 | } | |
356 | ||
0912b5ea | 357 | is_equal = capture_descriptors_are_equal(_a, _b); |
38114013 | 358 | |
683d081a JR |
359 | end: |
360 | return is_equal; | |
361 | } | |
362 | ||
363 | static void lttng_condition_event_rule_destroy( | |
364 | struct lttng_condition *condition) | |
365 | { | |
366 | struct lttng_condition_event_rule *event_rule; | |
367 | ||
368 | event_rule = container_of( | |
369 | condition, struct lttng_condition_event_rule, parent); | |
370 | ||
371 | lttng_event_rule_put(event_rule->rule); | |
38114013 | 372 | lttng_dynamic_pointer_array_reset(&event_rule->capture_descriptors); |
683d081a JR |
373 | free(event_rule); |
374 | } | |
375 | ||
38114013 | 376 | static |
0912b5ea | 377 | void destroy_capture_descriptor(void *ptr) |
38114013 | 378 | { |
0912b5ea JR |
379 | struct lttng_capture_descriptor *desc = |
380 | (struct lttng_capture_descriptor *) ptr; | |
381 | ||
382 | lttng_event_expr_destroy(desc->event_expression); | |
383 | free(desc->bytecode); | |
384 | free(desc); | |
38114013 PP |
385 | } |
386 | ||
683d081a JR |
387 | struct lttng_condition *lttng_condition_event_rule_create( |
388 | struct lttng_event_rule *rule) | |
389 | { | |
390 | struct lttng_condition *parent = NULL; | |
391 | struct lttng_condition_event_rule *condition = NULL; | |
392 | ||
393 | if (!rule) { | |
394 | goto end; | |
395 | } | |
396 | ||
397 | condition = zmalloc(sizeof(struct lttng_condition_event_rule)); | |
398 | if (!condition) { | |
399 | return NULL; | |
400 | } | |
401 | ||
402 | lttng_condition_init(&condition->parent, | |
403 | LTTNG_CONDITION_TYPE_EVENT_RULE_HIT); | |
404 | condition->parent.validate = lttng_condition_event_rule_validate, | |
405 | condition->parent.serialize = lttng_condition_event_rule_serialize, | |
406 | condition->parent.equal = lttng_condition_event_rule_is_equal, | |
407 | condition->parent.destroy = lttng_condition_event_rule_destroy, | |
408 | ||
409 | lttng_event_rule_get(rule); | |
410 | condition->rule = rule; | |
411 | rule = NULL; | |
412 | ||
38114013 | 413 | lttng_dynamic_pointer_array_init(&condition->capture_descriptors, |
0912b5ea | 414 | destroy_capture_descriptor); |
38114013 | 415 | |
683d081a JR |
416 | parent = &condition->parent; |
417 | end: | |
418 | return parent; | |
419 | } | |
420 | ||
38114013 PP |
421 | static |
422 | uint64_t uint_from_buffer(const struct lttng_buffer_view *view, size_t size, | |
423 | size_t *offset) | |
424 | { | |
425 | uint64_t ret; | |
426 | const struct lttng_buffer_view uint_view = | |
427 | lttng_buffer_view_from_view(view, *offset, size); | |
428 | ||
429 | if (!lttng_buffer_view_is_valid(&uint_view)) { | |
430 | ret = UINT64_C(-1); | |
431 | goto end; | |
432 | } | |
433 | ||
434 | switch (size) { | |
435 | case 1: | |
436 | ret = (uint64_t) *uint_view.data; | |
437 | break; | |
438 | case sizeof(uint32_t): | |
439 | { | |
440 | uint32_t u32; | |
441 | ||
442 | memcpy(&u32, uint_view.data, sizeof(u32)); | |
443 | ret = (uint64_t) u32; | |
444 | break; | |
445 | } | |
446 | case sizeof(ret): | |
447 | memcpy(&ret, uint_view.data, sizeof(ret)); | |
448 | break; | |
449 | default: | |
450 | abort(); | |
451 | } | |
452 | ||
453 | *offset += size; | |
454 | ||
455 | end: | |
456 | return ret; | |
457 | } | |
458 | ||
459 | static | |
460 | const char *str_from_buffer(const struct lttng_buffer_view *view, | |
461 | size_t *offset) | |
462 | { | |
463 | uint64_t len; | |
464 | const char *ret; | |
465 | ||
466 | len = uint_from_buffer(view, sizeof(uint32_t), offset); | |
467 | if (len == UINT64_C(-1)) { | |
468 | goto error; | |
469 | } | |
470 | ||
471 | ret = &view->data[*offset]; | |
472 | ||
473 | if (!lttng_buffer_view_contains_string(view, ret, len)) { | |
474 | goto error; | |
475 | } | |
476 | ||
477 | *offset += len; | |
478 | goto end; | |
479 | ||
480 | error: | |
481 | ret = NULL; | |
482 | ||
483 | end: | |
484 | return ret; | |
485 | } | |
486 | ||
487 | static | |
488 | struct lttng_event_expr *event_expr_from_payload( | |
489 | struct lttng_payload_view *view, size_t *offset) | |
490 | { | |
491 | struct lttng_event_expr *expr = NULL; | |
492 | const char *str; | |
493 | uint64_t type; | |
494 | ||
495 | type = uint_from_buffer(&view->buffer, sizeof(uint8_t), offset); | |
496 | if (type == UINT64_C(-1)) { | |
497 | goto error; | |
498 | } | |
499 | ||
500 | switch (type) { | |
501 | case LTTNG_EVENT_EXPR_TYPE_EVENT_PAYLOAD_FIELD: | |
502 | str = str_from_buffer(&view->buffer, offset); | |
503 | if (!str) { | |
504 | goto error; | |
505 | } | |
506 | ||
507 | expr = lttng_event_expr_event_payload_field_create(str); | |
508 | break; | |
509 | case LTTNG_EVENT_EXPR_TYPE_CHANNEL_CONTEXT_FIELD: | |
510 | str = str_from_buffer(&view->buffer, offset); | |
511 | if (!str) { | |
512 | goto error; | |
513 | } | |
514 | ||
515 | expr = lttng_event_expr_channel_context_field_create(str); | |
516 | break; | |
517 | case LTTNG_EVENT_EXPR_TYPE_APP_SPECIFIC_CONTEXT_FIELD: | |
518 | { | |
519 | const char *provider_name; | |
520 | const char *type_name; | |
521 | ||
522 | provider_name = str_from_buffer(&view->buffer, offset); | |
523 | if (!provider_name) { | |
524 | goto error; | |
525 | } | |
526 | ||
527 | type_name = str_from_buffer(&view->buffer, offset); | |
528 | if (!type_name) { | |
529 | goto error; | |
530 | } | |
531 | ||
532 | expr = lttng_event_expr_app_specific_context_field_create( | |
533 | provider_name, type_name); | |
534 | break; | |
535 | } | |
536 | case LTTNG_EVENT_EXPR_TYPE_ARRAY_FIELD_ELEMENT: | |
537 | { | |
538 | struct lttng_event_expr *array_field_expr; | |
539 | const uint64_t index = uint_from_buffer( | |
540 | &view->buffer, sizeof(uint32_t), offset); | |
541 | ||
542 | if (index == UINT64_C(-1)) { | |
543 | goto error; | |
544 | } | |
545 | ||
546 | /* Array field expression is the encoded after this. */ | |
547 | array_field_expr = event_expr_from_payload(view, offset); | |
548 | if (!array_field_expr) { | |
549 | goto error; | |
550 | } | |
551 | ||
552 | /* Move ownership of `array_field_expr` to new expression. */ | |
553 | expr = lttng_event_expr_array_field_element_create( | |
554 | array_field_expr, (unsigned int) index); | |
555 | if (!expr) { | |
556 | /* `array_field_expr` not moved: destroy it. */ | |
557 | lttng_event_expr_destroy(array_field_expr); | |
558 | } | |
559 | ||
560 | break; | |
561 | } | |
562 | default: | |
563 | abort(); | |
564 | } | |
565 | ||
566 | goto end; | |
567 | ||
568 | error: | |
569 | lttng_event_expr_destroy(expr); | |
570 | expr = NULL; | |
571 | ||
572 | end: | |
573 | return expr; | |
574 | } | |
575 | ||
683d081a JR |
576 | LTTNG_HIDDEN |
577 | ssize_t lttng_condition_event_rule_create_from_payload( | |
578 | struct lttng_payload_view *view, | |
579 | struct lttng_condition **_condition) | |
580 | { | |
38114013 PP |
581 | ssize_t consumed_length; |
582 | size_t offset = 0; | |
583 | ssize_t event_rule_length; | |
584 | uint32_t i, capture_descr_count; | |
683d081a JR |
585 | struct lttng_condition *condition = NULL; |
586 | struct lttng_event_rule *event_rule = NULL; | |
683d081a JR |
587 | |
588 | if (!view || !_condition) { | |
589 | goto error; | |
590 | } | |
591 | ||
38114013 | 592 | /* Struct lttng_event_rule. */ |
683d081a JR |
593 | { |
594 | struct lttng_payload_view event_rule_view = | |
595 | lttng_payload_view_from_view(view, offset, -1); | |
596 | ||
597 | event_rule_length = lttng_event_rule_create_from_payload( | |
598 | &event_rule_view, &event_rule); | |
599 | } | |
600 | ||
601 | if (event_rule_length < 0 || !event_rule) { | |
602 | goto error; | |
603 | } | |
604 | ||
38114013 PP |
605 | /* Create condition (no capture descriptors yet) at this point. */ |
606 | condition = lttng_condition_event_rule_create(event_rule); | |
607 | if (!condition) { | |
683d081a JR |
608 | goto error; |
609 | } | |
610 | ||
683d081a | 611 | |
38114013 PP |
612 | /* Capture descriptor count. */ |
613 | assert(event_rule_length >= 0); | |
614 | offset += (size_t) event_rule_length; | |
615 | capture_descr_count = uint_from_buffer(&view->buffer, sizeof(uint32_t), &offset); | |
616 | if (capture_descr_count == UINT32_C(-1)) { | |
683d081a JR |
617 | goto error; |
618 | } | |
619 | ||
38114013 PP |
620 | /* Capture descriptors. */ |
621 | for (i = 0; i < capture_descr_count; i++) { | |
6fb7c690 | 622 | enum lttng_condition_status status; |
38114013 PP |
623 | struct lttng_event_expr *expr = event_expr_from_payload( |
624 | view, &offset); | |
38114013 PP |
625 | |
626 | if (!expr) { | |
627 | goto error; | |
628 | } | |
629 | ||
630 | /* Move ownership of `expr` to `condition`. */ | |
631 | status = lttng_condition_event_rule_append_capture_descriptor( | |
632 | condition, expr); | |
633 | if (status != LTTNG_CONDITION_STATUS_OK) { | |
634 | /* `expr` not moved: destroy it. */ | |
635 | lttng_event_expr_destroy(expr); | |
636 | goto error; | |
637 | } | |
638 | } | |
639 | ||
640 | consumed_length = (ssize_t) offset; | |
683d081a JR |
641 | *_condition = condition; |
642 | condition = NULL; | |
643 | goto end; | |
644 | ||
645 | error: | |
38114013 | 646 | consumed_length = -1; |
683d081a JR |
647 | |
648 | end: | |
649 | lttng_event_rule_put(event_rule); | |
650 | lttng_condition_put(condition); | |
38114013 | 651 | return consumed_length; |
683d081a JR |
652 | } |
653 | ||
654 | LTTNG_HIDDEN | |
655 | enum lttng_condition_status lttng_condition_event_rule_borrow_rule_mutable( | |
656 | const struct lttng_condition *condition, | |
657 | struct lttng_event_rule **rule) | |
658 | { | |
659 | struct lttng_condition_event_rule *event_rule; | |
660 | enum lttng_condition_status status = LTTNG_CONDITION_STATUS_OK; | |
661 | ||
662 | if (!condition || !IS_EVENT_RULE_CONDITION(condition) || !rule) { | |
663 | status = LTTNG_CONDITION_STATUS_INVALID; | |
664 | goto end; | |
665 | } | |
666 | ||
667 | event_rule = container_of( | |
668 | condition, struct lttng_condition_event_rule, parent); | |
669 | if (!event_rule->rule) { | |
670 | status = LTTNG_CONDITION_STATUS_UNSET; | |
671 | goto end; | |
672 | } | |
673 | ||
674 | *rule = event_rule->rule; | |
675 | end: | |
676 | return status; | |
677 | } | |
678 | ||
679 | enum lttng_condition_status lttng_condition_event_rule_get_rule( | |
680 | const struct lttng_condition *condition, | |
681 | const struct lttng_event_rule **rule) | |
682 | { | |
683 | struct lttng_event_rule *mutable_rule = NULL; | |
684 | const enum lttng_condition_status status = | |
685 | lttng_condition_event_rule_borrow_rule_mutable( | |
686 | condition, &mutable_rule); | |
687 | ||
688 | *rule = mutable_rule; | |
689 | return status; | |
690 | } | |
691 | ||
38114013 PP |
692 | enum lttng_condition_status |
693 | lttng_condition_event_rule_append_capture_descriptor( | |
694 | struct lttng_condition *condition, | |
695 | struct lttng_event_expr *expr) | |
696 | { | |
697 | int ret; | |
698 | enum lttng_condition_status status = LTTNG_CONDITION_STATUS_OK; | |
699 | struct lttng_condition_event_rule *event_rule_cond = | |
700 | container_of(condition, | |
701 | struct lttng_condition_event_rule, parent); | |
0912b5ea | 702 | struct lttng_capture_descriptor *descriptor = NULL; |
38114013 PP |
703 | |
704 | /* Only accept l-values. */ | |
705 | if (!condition || !IS_EVENT_RULE_CONDITION(condition) || !expr || | |
706 | !lttng_event_expr_is_lvalue(expr)) { | |
707 | status = LTTNG_CONDITION_STATUS_INVALID; | |
708 | goto end; | |
709 | } | |
710 | ||
0912b5ea JR |
711 | descriptor = malloc(sizeof(*descriptor)); |
712 | if (descriptor == NULL) { | |
713 | status = LTTNG_CONDITION_STATUS_ERROR; | |
714 | goto end; | |
715 | } | |
716 | ||
717 | descriptor->event_expression = expr; | |
718 | descriptor->bytecode = NULL; | |
719 | ||
38114013 | 720 | ret = lttng_dynamic_pointer_array_add_pointer( |
0912b5ea | 721 | &event_rule_cond->capture_descriptors, descriptor); |
38114013 PP |
722 | if (ret) { |
723 | status = LTTNG_CONDITION_STATUS_ERROR; | |
724 | goto end; | |
725 | } | |
726 | ||
0912b5ea JR |
727 | /* Ownership is transfered to the internal capture_descriptors array */ |
728 | descriptor = NULL; | |
38114013 | 729 | end: |
0912b5ea | 730 | free(descriptor); |
38114013 PP |
731 | return status; |
732 | } | |
733 | ||
734 | enum lttng_condition_status | |
735 | lttng_condition_event_rule_get_capture_descriptor_count( | |
736 | const struct lttng_condition *condition, unsigned int *count) | |
737 | { | |
738 | enum lttng_condition_status status = LTTNG_CONDITION_STATUS_OK; | |
739 | const struct lttng_condition_event_rule *event_rule_cond = | |
740 | container_of(condition, | |
741 | const struct lttng_condition_event_rule, | |
742 | parent); | |
743 | ||
744 | if (!condition || !IS_EVENT_RULE_CONDITION(condition) || !count) { | |
745 | status = LTTNG_CONDITION_STATUS_INVALID; | |
746 | goto end; | |
747 | } | |
748 | ||
749 | *count = lttng_dynamic_pointer_array_get_count( | |
750 | &event_rule_cond->capture_descriptors); | |
751 | ||
752 | end: | |
753 | return status; | |
754 | } | |
755 | ||
756 | const struct lttng_event_expr * | |
757 | lttng_condition_event_rule_get_capture_descriptor_at_index( | |
758 | const struct lttng_condition *condition, unsigned int index) | |
759 | { | |
38114013 | 760 | const struct lttng_event_expr *expr = NULL; |
6fb7c690 | 761 | const struct lttng_capture_descriptor *desc = NULL; |
0912b5ea | 762 | |
6fb7c690 JR |
763 | desc = lttng_condition_event_rule_get_internal_capture_descriptor_at_index( |
764 | condition, index); | |
765 | if (desc == NULL) { | |
38114013 PP |
766 | goto end; |
767 | } | |
0912b5ea | 768 | expr = desc->event_expression; |
38114013 PP |
769 | |
770 | end: | |
771 | return expr; | |
772 | } | |
773 | ||
683d081a JR |
774 | LTTNG_HIDDEN |
775 | ssize_t lttng_evaluation_event_rule_create_from_payload( | |
776 | struct lttng_payload_view *view, | |
777 | struct lttng_evaluation **_evaluation) | |
778 | { | |
779 | ssize_t ret, offset = 0; | |
780 | const char *trigger_name; | |
781 | struct lttng_evaluation *evaluation = NULL; | |
782 | const struct lttng_evaluation_event_rule_comm *header; | |
783 | const struct lttng_payload_view header_view = | |
784 | lttng_payload_view_from_view( | |
785 | view, 0, sizeof(*header)); | |
786 | ||
787 | if (!_evaluation) { | |
788 | ret = -1; | |
789 | goto error; | |
790 | } | |
791 | ||
792 | if (!lttng_payload_view_is_valid(&header_view)) { | |
793 | ERR("Failed to initialize from malformed event rule evaluation: buffer too short to contain header"); | |
794 | ret = -1; | |
795 | goto error; | |
796 | } | |
797 | ||
798 | header = (typeof(header)) header_view.buffer.data; | |
799 | ||
800 | /* Map the originating trigger's name. */ | |
801 | offset += sizeof(*header); | |
802 | { | |
803 | struct lttng_payload_view current_view = | |
804 | lttng_payload_view_from_view(view, offset, | |
805 | header->trigger_name_length); | |
806 | ||
807 | if (!lttng_payload_view_is_valid(¤t_view)) { | |
808 | ERR("Failed to initialize from malformed event rule evaluation: buffer too short to contain trigger name"); | |
809 | ret = -1; | |
810 | goto error; | |
811 | } | |
812 | ||
813 | trigger_name = current_view.buffer.data; | |
814 | if (!lttng_buffer_view_contains_string(¤t_view.buffer, | |
815 | trigger_name, header->trigger_name_length)) { | |
816 | ERR("Failed to initialize from malformed event rule evaluation: invalid trigger name"); | |
817 | ret = -1; | |
818 | goto error; | |
819 | } | |
820 | } | |
821 | ||
822 | offset += header->trigger_name_length; | |
823 | ||
824 | evaluation = lttng_evaluation_event_rule_create(trigger_name); | |
825 | if (!evaluation) { | |
826 | ret = -1; | |
827 | goto error; | |
828 | } | |
829 | ||
830 | *_evaluation = evaluation; | |
831 | evaluation = NULL; | |
832 | ret = offset; | |
833 | ||
834 | error: | |
835 | lttng_evaluation_destroy(evaluation); | |
836 | return ret; | |
837 | } | |
838 | ||
839 | static int lttng_evaluation_event_rule_serialize( | |
840 | const struct lttng_evaluation *evaluation, | |
841 | struct lttng_payload *payload) | |
842 | { | |
843 | int ret = 0; | |
844 | struct lttng_evaluation_event_rule *hit; | |
845 | struct lttng_evaluation_event_rule_comm comm; | |
846 | ||
847 | hit = container_of( | |
848 | evaluation, struct lttng_evaluation_event_rule, parent); | |
849 | ||
850 | assert(hit->name); | |
851 | comm.trigger_name_length = strlen(hit->name) + 1; | |
852 | ||
853 | ret = lttng_dynamic_buffer_append( | |
854 | &payload->buffer, &comm, sizeof(comm)); | |
855 | if (ret) { | |
856 | goto end; | |
857 | } | |
858 | ||
859 | ret = lttng_dynamic_buffer_append( | |
860 | &payload->buffer, hit->name, comm.trigger_name_length); | |
861 | end: | |
862 | return ret; | |
863 | } | |
864 | ||
865 | static void lttng_evaluation_event_rule_destroy( | |
866 | struct lttng_evaluation *evaluation) | |
867 | { | |
868 | struct lttng_evaluation_event_rule *hit; | |
869 | ||
870 | hit = container_of( | |
871 | evaluation, struct lttng_evaluation_event_rule, parent); | |
872 | free(hit->name); | |
873 | free(hit); | |
874 | } | |
875 | ||
876 | LTTNG_HIDDEN | |
877 | struct lttng_evaluation *lttng_evaluation_event_rule_create( | |
878 | const char *trigger_name) | |
879 | { | |
880 | struct lttng_evaluation_event_rule *hit; | |
881 | struct lttng_evaluation *evaluation = NULL; | |
882 | ||
883 | hit = zmalloc(sizeof(struct lttng_evaluation_event_rule)); | |
884 | if (!hit) { | |
885 | goto end; | |
886 | } | |
887 | ||
888 | hit->name = strdup(trigger_name); | |
889 | if (!hit->name) { | |
890 | goto end; | |
891 | } | |
892 | ||
893 | hit->parent.type = LTTNG_CONDITION_TYPE_EVENT_RULE_HIT; | |
894 | hit->parent.serialize = lttng_evaluation_event_rule_serialize; | |
895 | hit->parent.destroy = lttng_evaluation_event_rule_destroy; | |
896 | ||
897 | evaluation = &hit->parent; | |
898 | hit = NULL; | |
899 | ||
900 | end: | |
901 | if (hit) { | |
902 | lttng_evaluation_event_rule_destroy(&hit->parent); | |
903 | } | |
904 | ||
905 | return evaluation; | |
906 | } | |
907 | ||
908 | enum lttng_evaluation_status lttng_evaluation_event_rule_get_trigger_name( | |
909 | const struct lttng_evaluation *evaluation, const char **name) | |
910 | { | |
911 | struct lttng_evaluation_event_rule *hit; | |
912 | enum lttng_evaluation_status status = LTTNG_EVALUATION_STATUS_OK; | |
913 | ||
914 | if (!evaluation || !is_event_rule_evaluation(evaluation) || !name) { | |
915 | status = LTTNG_EVALUATION_STATUS_INVALID; | |
916 | goto end; | |
917 | } | |
918 | ||
919 | hit = container_of( | |
920 | evaluation, struct lttng_evaluation_event_rule, parent); | |
921 | *name = hit->name; | |
922 | end: | |
923 | return status; | |
924 | } |