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> | |
834966af | 10 | #include <common/event-expr-to-bytecode.h> |
683d081a | 11 | #include <common/macros.h> |
38114013 | 12 | #include <inttypes.h> |
683d081a | 13 | #include <lttng/condition/condition-internal.h> |
834966af | 14 | #include <lttng/event-rule/event-rule-internal.h> |
683d081a JR |
15 | #include <lttng/condition/event-rule-internal.h> |
16 | #include <lttng/condition/event-rule.h> | |
38114013 PP |
17 | #include <lttng/event-expr-internal.h> |
18 | #include <lttng/event-expr.h> | |
834966af | 19 | #include <lttng/lttng-error.h> |
683d081a | 20 | #include <stdbool.h> |
38114013 | 21 | #include <stdint.h> |
116a02e3 | 22 | #include <vendor/msgpack/msgpack.h> |
683d081a JR |
23 | |
24 | #define IS_EVENT_RULE_CONDITION(condition) \ | |
25 | (lttng_condition_get_type(condition) == \ | |
26 | LTTNG_CONDITION_TYPE_EVENT_RULE_HIT) | |
27 | ||
28 | static bool is_event_rule_evaluation(const struct lttng_evaluation *evaluation) | |
29 | { | |
30 | enum lttng_condition_type type = lttng_evaluation_get_type(evaluation); | |
31 | ||
32 | return type == LTTNG_CONDITION_TYPE_EVENT_RULE_HIT; | |
33 | } | |
34 | ||
35 | static bool lttng_condition_event_rule_validate( | |
36 | const struct lttng_condition *condition); | |
37 | static int lttng_condition_event_rule_serialize( | |
38 | const struct lttng_condition *condition, | |
39 | struct lttng_payload *payload); | |
40 | static bool lttng_condition_event_rule_is_equal( | |
41 | const struct lttng_condition *_a, | |
42 | const struct lttng_condition *_b); | |
43 | static void lttng_condition_event_rule_destroy( | |
44 | struct lttng_condition *condition); | |
45 | ||
46 | static bool lttng_condition_event_rule_validate( | |
47 | const struct lttng_condition *condition) | |
48 | { | |
49 | bool valid = false; | |
50 | struct lttng_condition_event_rule *event_rule; | |
51 | ||
52 | if (!condition) { | |
53 | goto end; | |
54 | } | |
55 | ||
56 | event_rule = container_of( | |
57 | condition, struct lttng_condition_event_rule, parent); | |
58 | if (!event_rule->rule) { | |
59 | ERR("Invalid event rule condition: a rule must be set."); | |
60 | goto end; | |
61 | } | |
62 | ||
63 | valid = lttng_event_rule_validate(event_rule->rule); | |
64 | end: | |
65 | return valid; | |
66 | } | |
67 | ||
38114013 PP |
68 | /* |
69 | * Serializes the C string `str` into `buf`. | |
70 | * | |
71 | * Encoding is the length of `str` plus one (for the null character), | |
72 | * and then the string, including its null terminator. | |
73 | */ | |
74 | static | |
75 | int serialize_cstr(const char *str, struct lttng_dynamic_buffer *buf) | |
76 | { | |
77 | int ret; | |
78 | const uint32_t len = strlen(str) + 1; | |
79 | ||
80 | /* Serialize the length, including the null terminator. */ | |
81 | DBG("Serializing C string's length (including null terminator): " | |
82 | "%" PRIu32, len); | |
83 | ret = lttng_dynamic_buffer_append(buf, &len, sizeof(len)); | |
84 | if (ret) { | |
85 | goto end; | |
86 | } | |
87 | ||
88 | /* Serialize the string. */ | |
89 | DBG("Serializing C string: '%s'", str); | |
90 | ret = lttng_dynamic_buffer_append(buf, str, len); | |
91 | if (ret) { | |
92 | goto end; | |
93 | } | |
94 | ||
95 | end: | |
96 | return ret; | |
97 | } | |
98 | ||
99 | /* | |
100 | * Serializes the event expression `expr` into `buf`. | |
101 | */ | |
102 | static | |
103 | int serialize_event_expr(const struct lttng_event_expr *expr, | |
104 | struct lttng_payload *payload) | |
105 | { | |
106 | const uint8_t type = expr->type; | |
107 | int ret; | |
108 | ||
109 | /* Serialize the expression's type. */ | |
110 | DBG("Serializing event expression's type: %d", expr->type); | |
111 | ret = lttng_dynamic_buffer_append(&payload->buffer, &type, sizeof(type)); | |
112 | if (ret) { | |
113 | goto end; | |
114 | } | |
115 | ||
116 | /* Serialize the expression */ | |
117 | switch (expr->type) { | |
118 | case LTTNG_EVENT_EXPR_TYPE_EVENT_PAYLOAD_FIELD: | |
119 | case LTTNG_EVENT_EXPR_TYPE_CHANNEL_CONTEXT_FIELD: | |
120 | { | |
121 | const struct lttng_event_expr_field *field_expr = | |
122 | container_of(expr, | |
123 | const struct lttng_event_expr_field, | |
124 | parent); | |
125 | ||
126 | /* Serialize the field name. */ | |
127 | DBG("Serializing field event expression's field name: '%s'", | |
128 | field_expr->name); | |
129 | ret = serialize_cstr(field_expr->name, &payload->buffer); | |
130 | if (ret) { | |
131 | goto end; | |
132 | } | |
133 | ||
134 | break; | |
135 | } | |
136 | case LTTNG_EVENT_EXPR_TYPE_APP_SPECIFIC_CONTEXT_FIELD: | |
137 | { | |
138 | const struct lttng_event_expr_app_specific_context_field *field_expr = | |
139 | container_of(expr, | |
140 | const struct lttng_event_expr_app_specific_context_field, | |
141 | parent); | |
142 | ||
143 | /* Serialize the provider name. */ | |
144 | DBG("Serializing app-specific context field event expression's " | |
145 | "provider name: '%s'", | |
146 | field_expr->provider_name); | |
147 | ret = serialize_cstr(field_expr->provider_name, &payload->buffer); | |
148 | if (ret) { | |
149 | goto end; | |
150 | } | |
151 | ||
152 | /* Serialize the type name. */ | |
153 | DBG("Serializing app-specific context field event expression's " | |
154 | "type name: '%s'", | |
155 | field_expr->provider_name); | |
156 | ret = serialize_cstr(field_expr->type_name, &payload->buffer); | |
157 | if (ret) { | |
158 | goto end; | |
159 | } | |
160 | ||
161 | break; | |
162 | } | |
163 | case LTTNG_EVENT_EXPR_TYPE_ARRAY_FIELD_ELEMENT: | |
164 | { | |
165 | const struct lttng_event_expr_array_field_element *elem_expr = | |
166 | container_of(expr, | |
167 | const struct lttng_event_expr_array_field_element, | |
168 | parent); | |
169 | const uint32_t index = elem_expr->index; | |
170 | ||
171 | /* Serialize the index. */ | |
172 | DBG("Serializing array field element event expression's " | |
173 | "index: %u", elem_expr->index); | |
174 | ret = lttng_dynamic_buffer_append(&payload->buffer, &index, sizeof(index)); | |
175 | if (ret) { | |
176 | goto end; | |
177 | } | |
178 | ||
179 | /* Serialize the parent array field expression. */ | |
180 | DBG("Serializing array field element event expression's " | |
181 | "parent array field event expression."); | |
182 | ret = serialize_event_expr(elem_expr->array_field_expr, payload); | |
183 | if (ret) { | |
184 | goto end; | |
185 | } | |
186 | ||
187 | break; | |
188 | } | |
189 | default: | |
190 | break; | |
191 | } | |
192 | ||
193 | end: | |
194 | return ret; | |
195 | } | |
196 | ||
6fb7c690 JR |
197 | static |
198 | struct lttng_capture_descriptor * | |
199 | lttng_condition_event_rule_get_internal_capture_descriptor_at_index( | |
200 | const struct lttng_condition *condition, unsigned int index) | |
201 | { | |
202 | const struct lttng_condition_event_rule *event_rule_cond = | |
203 | container_of(condition, | |
204 | const struct lttng_condition_event_rule, | |
205 | parent); | |
206 | struct lttng_capture_descriptor *desc = NULL; | |
207 | unsigned int count; | |
208 | enum lttng_condition_status status; | |
209 | ||
210 | if (!condition || !IS_EVENT_RULE_CONDITION(condition)) { | |
211 | goto end; | |
212 | } | |
213 | ||
214 | status = lttng_condition_event_rule_get_capture_descriptor_count( | |
215 | condition, &count); | |
216 | if (status != LTTNG_CONDITION_STATUS_OK) { | |
217 | goto end; | |
218 | } | |
219 | ||
220 | if (index >= count) { | |
221 | goto end; | |
222 | } | |
223 | ||
224 | desc = lttng_dynamic_pointer_array_get_pointer( | |
225 | &event_rule_cond->capture_descriptors, index); | |
226 | end: | |
227 | return desc; | |
228 | } | |
229 | ||
683d081a JR |
230 | static int lttng_condition_event_rule_serialize( |
231 | const struct lttng_condition *condition, | |
232 | struct lttng_payload *payload) | |
233 | { | |
234 | int ret; | |
683d081a | 235 | struct lttng_condition_event_rule *event_rule; |
0912b5ea | 236 | enum lttng_condition_status status; |
38114013 PP |
237 | /* Used for iteration and communication (size matters). */ |
238 | uint32_t i, capture_descr_count; | |
683d081a JR |
239 | |
240 | if (!condition || !IS_EVENT_RULE_CONDITION(condition)) { | |
241 | ret = -1; | |
242 | goto end; | |
243 | } | |
244 | ||
245 | DBG("Serializing event rule condition"); | |
246 | event_rule = container_of( | |
247 | condition, struct lttng_condition_event_rule, parent); | |
248 | ||
38114013 PP |
249 | DBG("Serializing event rule condition's event rule"); |
250 | ret = lttng_event_rule_serialize(event_rule->rule, payload); | |
683d081a JR |
251 | if (ret) { |
252 | goto end; | |
253 | } | |
254 | ||
0912b5ea JR |
255 | status = lttng_condition_event_rule_get_capture_descriptor_count( |
256 | condition, &capture_descr_count); | |
257 | if (status != LTTNG_CONDITION_STATUS_OK) { | |
258 | ret = -1; | |
259 | goto end; | |
260 | }; | |
261 | ||
38114013 PP |
262 | DBG("Serializing event rule condition's capture descriptor count: %" PRIu32, |
263 | capture_descr_count); | |
264 | ret = lttng_dynamic_buffer_append(&payload->buffer, &capture_descr_count, | |
265 | sizeof(capture_descr_count)); | |
683d081a JR |
266 | if (ret) { |
267 | goto end; | |
268 | } | |
269 | ||
38114013 | 270 | for (i = 0; i < capture_descr_count; i++) { |
6fb7c690 JR |
271 | const struct lttng_capture_descriptor *desc = |
272 | lttng_condition_event_rule_get_internal_capture_descriptor_at_index( | |
0912b5ea | 273 | condition, i); |
38114013 PP |
274 | |
275 | DBG("Serializing event rule condition's capture descriptor %" PRIu32, | |
276 | i); | |
6fb7c690 | 277 | ret = serialize_event_expr(desc->event_expression, payload); |
38114013 PP |
278 | if (ret) { |
279 | goto end; | |
280 | } | |
281 | } | |
683d081a JR |
282 | |
283 | end: | |
284 | return ret; | |
285 | } | |
286 | ||
38114013 PP |
287 | static |
288 | bool capture_descriptors_are_equal( | |
0912b5ea JR |
289 | const struct lttng_condition *condition_a, |
290 | const struct lttng_condition *condition_b) | |
38114013 PP |
291 | { |
292 | bool is_equal = true; | |
0912b5ea JR |
293 | unsigned int capture_descr_count_a; |
294 | unsigned int capture_descr_count_b; | |
38114013 | 295 | size_t i; |
0912b5ea | 296 | enum lttng_condition_status status; |
38114013 | 297 | |
0912b5ea JR |
298 | status = lttng_condition_event_rule_get_capture_descriptor_count( |
299 | condition_a, &capture_descr_count_a); | |
300 | if (status != LTTNG_CONDITION_STATUS_OK) { | |
301 | goto not_equal; | |
302 | } | |
303 | ||
304 | status = lttng_condition_event_rule_get_capture_descriptor_count( | |
305 | condition_b, &capture_descr_count_b); | |
306 | if (status != LTTNG_CONDITION_STATUS_OK) { | |
307 | goto not_equal; | |
308 | } | |
38114013 PP |
309 | |
310 | if (capture_descr_count_a != capture_descr_count_b) { | |
311 | goto not_equal; | |
312 | } | |
313 | ||
314 | for (i = 0; i < capture_descr_count_a; i++) { | |
315 | const struct lttng_event_expr *expr_a = | |
0912b5ea JR |
316 | lttng_condition_event_rule_get_capture_descriptor_at_index( |
317 | condition_a, | |
38114013 PP |
318 | i); |
319 | const struct lttng_event_expr *expr_b = | |
0912b5ea JR |
320 | lttng_condition_event_rule_get_capture_descriptor_at_index( |
321 | condition_b, | |
38114013 PP |
322 | i); |
323 | ||
324 | if (!lttng_event_expr_is_equal(expr_a, expr_b)) { | |
325 | goto not_equal; | |
326 | } | |
327 | } | |
328 | ||
329 | goto end; | |
330 | ||
331 | not_equal: | |
332 | is_equal = false; | |
333 | ||
334 | end: | |
335 | return is_equal; | |
336 | } | |
337 | ||
683d081a JR |
338 | static bool lttng_condition_event_rule_is_equal( |
339 | const struct lttng_condition *_a, | |
340 | const struct lttng_condition *_b) | |
341 | { | |
342 | bool is_equal = false; | |
343 | struct lttng_condition_event_rule *a, *b; | |
344 | ||
345 | a = container_of(_a, struct lttng_condition_event_rule, parent); | |
346 | b = container_of(_b, struct lttng_condition_event_rule, parent); | |
347 | ||
348 | /* Both event rules must be set or both must be unset. */ | |
349 | if ((a->rule && !b->rule) || (!a->rule && b->rule)) { | |
350 | WARN("Comparing event_rule conditions with uninitialized rule"); | |
351 | goto end; | |
352 | } | |
353 | ||
354 | is_equal = lttng_event_rule_is_equal(a->rule, b->rule); | |
38114013 PP |
355 | if (!is_equal) { |
356 | goto end; | |
357 | } | |
358 | ||
0912b5ea | 359 | is_equal = capture_descriptors_are_equal(_a, _b); |
38114013 | 360 | |
683d081a JR |
361 | end: |
362 | return is_equal; | |
363 | } | |
364 | ||
365 | static void lttng_condition_event_rule_destroy( | |
366 | struct lttng_condition *condition) | |
367 | { | |
368 | struct lttng_condition_event_rule *event_rule; | |
369 | ||
370 | event_rule = container_of( | |
371 | condition, struct lttng_condition_event_rule, parent); | |
372 | ||
373 | lttng_event_rule_put(event_rule->rule); | |
38114013 | 374 | lttng_dynamic_pointer_array_reset(&event_rule->capture_descriptors); |
683d081a JR |
375 | free(event_rule); |
376 | } | |
377 | ||
38114013 | 378 | static |
0912b5ea | 379 | void destroy_capture_descriptor(void *ptr) |
38114013 | 380 | { |
0912b5ea JR |
381 | struct lttng_capture_descriptor *desc = |
382 | (struct lttng_capture_descriptor *) ptr; | |
383 | ||
384 | lttng_event_expr_destroy(desc->event_expression); | |
385 | free(desc->bytecode); | |
386 | free(desc); | |
38114013 PP |
387 | } |
388 | ||
683d081a JR |
389 | struct lttng_condition *lttng_condition_event_rule_create( |
390 | struct lttng_event_rule *rule) | |
391 | { | |
392 | struct lttng_condition *parent = NULL; | |
393 | struct lttng_condition_event_rule *condition = NULL; | |
394 | ||
395 | if (!rule) { | |
396 | goto end; | |
397 | } | |
398 | ||
399 | condition = zmalloc(sizeof(struct lttng_condition_event_rule)); | |
400 | if (!condition) { | |
401 | return NULL; | |
402 | } | |
403 | ||
404 | lttng_condition_init(&condition->parent, | |
405 | LTTNG_CONDITION_TYPE_EVENT_RULE_HIT); | |
406 | condition->parent.validate = lttng_condition_event_rule_validate, | |
407 | condition->parent.serialize = lttng_condition_event_rule_serialize, | |
408 | condition->parent.equal = lttng_condition_event_rule_is_equal, | |
409 | condition->parent.destroy = lttng_condition_event_rule_destroy, | |
410 | ||
411 | lttng_event_rule_get(rule); | |
412 | condition->rule = rule; | |
413 | rule = NULL; | |
414 | ||
38114013 | 415 | lttng_dynamic_pointer_array_init(&condition->capture_descriptors, |
0912b5ea | 416 | destroy_capture_descriptor); |
38114013 | 417 | |
683d081a JR |
418 | parent = &condition->parent; |
419 | end: | |
420 | return parent; | |
421 | } | |
422 | ||
38114013 PP |
423 | static |
424 | uint64_t uint_from_buffer(const struct lttng_buffer_view *view, size_t size, | |
425 | size_t *offset) | |
426 | { | |
427 | uint64_t ret; | |
428 | const struct lttng_buffer_view uint_view = | |
429 | lttng_buffer_view_from_view(view, *offset, size); | |
430 | ||
431 | if (!lttng_buffer_view_is_valid(&uint_view)) { | |
432 | ret = UINT64_C(-1); | |
433 | goto end; | |
434 | } | |
435 | ||
436 | switch (size) { | |
437 | case 1: | |
438 | ret = (uint64_t) *uint_view.data; | |
439 | break; | |
440 | case sizeof(uint32_t): | |
441 | { | |
442 | uint32_t u32; | |
443 | ||
444 | memcpy(&u32, uint_view.data, sizeof(u32)); | |
445 | ret = (uint64_t) u32; | |
446 | break; | |
447 | } | |
448 | case sizeof(ret): | |
449 | memcpy(&ret, uint_view.data, sizeof(ret)); | |
450 | break; | |
451 | default: | |
452 | abort(); | |
453 | } | |
454 | ||
455 | *offset += size; | |
456 | ||
457 | end: | |
458 | return ret; | |
459 | } | |
460 | ||
461 | static | |
462 | const char *str_from_buffer(const struct lttng_buffer_view *view, | |
463 | size_t *offset) | |
464 | { | |
465 | uint64_t len; | |
466 | const char *ret; | |
467 | ||
468 | len = uint_from_buffer(view, sizeof(uint32_t), offset); | |
469 | if (len == UINT64_C(-1)) { | |
470 | goto error; | |
471 | } | |
472 | ||
473 | ret = &view->data[*offset]; | |
474 | ||
475 | if (!lttng_buffer_view_contains_string(view, ret, len)) { | |
476 | goto error; | |
477 | } | |
478 | ||
479 | *offset += len; | |
480 | goto end; | |
481 | ||
482 | error: | |
483 | ret = NULL; | |
484 | ||
485 | end: | |
486 | return ret; | |
487 | } | |
488 | ||
489 | static | |
490 | struct lttng_event_expr *event_expr_from_payload( | |
491 | struct lttng_payload_view *view, size_t *offset) | |
492 | { | |
493 | struct lttng_event_expr *expr = NULL; | |
494 | const char *str; | |
495 | uint64_t type; | |
496 | ||
497 | type = uint_from_buffer(&view->buffer, sizeof(uint8_t), offset); | |
498 | if (type == UINT64_C(-1)) { | |
499 | goto error; | |
500 | } | |
501 | ||
502 | switch (type) { | |
503 | case LTTNG_EVENT_EXPR_TYPE_EVENT_PAYLOAD_FIELD: | |
504 | str = str_from_buffer(&view->buffer, offset); | |
505 | if (!str) { | |
506 | goto error; | |
507 | } | |
508 | ||
509 | expr = lttng_event_expr_event_payload_field_create(str); | |
510 | break; | |
511 | case LTTNG_EVENT_EXPR_TYPE_CHANNEL_CONTEXT_FIELD: | |
512 | str = str_from_buffer(&view->buffer, offset); | |
513 | if (!str) { | |
514 | goto error; | |
515 | } | |
516 | ||
517 | expr = lttng_event_expr_channel_context_field_create(str); | |
518 | break; | |
519 | case LTTNG_EVENT_EXPR_TYPE_APP_SPECIFIC_CONTEXT_FIELD: | |
520 | { | |
521 | const char *provider_name; | |
522 | const char *type_name; | |
523 | ||
524 | provider_name = str_from_buffer(&view->buffer, offset); | |
525 | if (!provider_name) { | |
526 | goto error; | |
527 | } | |
528 | ||
529 | type_name = str_from_buffer(&view->buffer, offset); | |
530 | if (!type_name) { | |
531 | goto error; | |
532 | } | |
533 | ||
534 | expr = lttng_event_expr_app_specific_context_field_create( | |
535 | provider_name, type_name); | |
536 | break; | |
537 | } | |
538 | case LTTNG_EVENT_EXPR_TYPE_ARRAY_FIELD_ELEMENT: | |
539 | { | |
540 | struct lttng_event_expr *array_field_expr; | |
541 | const uint64_t index = uint_from_buffer( | |
542 | &view->buffer, sizeof(uint32_t), offset); | |
543 | ||
544 | if (index == UINT64_C(-1)) { | |
545 | goto error; | |
546 | } | |
547 | ||
548 | /* Array field expression is the encoded after this. */ | |
549 | array_field_expr = event_expr_from_payload(view, offset); | |
550 | if (!array_field_expr) { | |
551 | goto error; | |
552 | } | |
553 | ||
554 | /* Move ownership of `array_field_expr` to new expression. */ | |
555 | expr = lttng_event_expr_array_field_element_create( | |
556 | array_field_expr, (unsigned int) index); | |
557 | if (!expr) { | |
558 | /* `array_field_expr` not moved: destroy it. */ | |
559 | lttng_event_expr_destroy(array_field_expr); | |
560 | } | |
561 | ||
562 | break; | |
563 | } | |
564 | default: | |
565 | abort(); | |
566 | } | |
567 | ||
568 | goto end; | |
569 | ||
570 | error: | |
571 | lttng_event_expr_destroy(expr); | |
572 | expr = NULL; | |
573 | ||
574 | end: | |
575 | return expr; | |
576 | } | |
577 | ||
683d081a JR |
578 | LTTNG_HIDDEN |
579 | ssize_t lttng_condition_event_rule_create_from_payload( | |
580 | struct lttng_payload_view *view, | |
581 | struct lttng_condition **_condition) | |
582 | { | |
38114013 PP |
583 | ssize_t consumed_length; |
584 | size_t offset = 0; | |
585 | ssize_t event_rule_length; | |
586 | uint32_t i, capture_descr_count; | |
683d081a JR |
587 | struct lttng_condition *condition = NULL; |
588 | struct lttng_event_rule *event_rule = NULL; | |
683d081a JR |
589 | |
590 | if (!view || !_condition) { | |
591 | goto error; | |
592 | } | |
593 | ||
38114013 | 594 | /* Struct lttng_event_rule. */ |
683d081a JR |
595 | { |
596 | struct lttng_payload_view event_rule_view = | |
597 | lttng_payload_view_from_view(view, offset, -1); | |
598 | ||
599 | event_rule_length = lttng_event_rule_create_from_payload( | |
600 | &event_rule_view, &event_rule); | |
601 | } | |
602 | ||
603 | if (event_rule_length < 0 || !event_rule) { | |
604 | goto error; | |
605 | } | |
606 | ||
38114013 PP |
607 | /* Create condition (no capture descriptors yet) at this point. */ |
608 | condition = lttng_condition_event_rule_create(event_rule); | |
609 | if (!condition) { | |
683d081a JR |
610 | goto error; |
611 | } | |
612 | ||
683d081a | 613 | |
38114013 PP |
614 | /* Capture descriptor count. */ |
615 | assert(event_rule_length >= 0); | |
616 | offset += (size_t) event_rule_length; | |
617 | capture_descr_count = uint_from_buffer(&view->buffer, sizeof(uint32_t), &offset); | |
618 | if (capture_descr_count == UINT32_C(-1)) { | |
683d081a JR |
619 | goto error; |
620 | } | |
621 | ||
38114013 PP |
622 | /* Capture descriptors. */ |
623 | for (i = 0; i < capture_descr_count; i++) { | |
6fb7c690 | 624 | enum lttng_condition_status status; |
38114013 PP |
625 | struct lttng_event_expr *expr = event_expr_from_payload( |
626 | view, &offset); | |
38114013 PP |
627 | |
628 | if (!expr) { | |
629 | goto error; | |
630 | } | |
631 | ||
632 | /* Move ownership of `expr` to `condition`. */ | |
633 | status = lttng_condition_event_rule_append_capture_descriptor( | |
634 | condition, expr); | |
635 | if (status != LTTNG_CONDITION_STATUS_OK) { | |
636 | /* `expr` not moved: destroy it. */ | |
637 | lttng_event_expr_destroy(expr); | |
638 | goto error; | |
639 | } | |
640 | } | |
641 | ||
642 | consumed_length = (ssize_t) offset; | |
683d081a JR |
643 | *_condition = condition; |
644 | condition = NULL; | |
645 | goto end; | |
646 | ||
647 | error: | |
38114013 | 648 | consumed_length = -1; |
683d081a JR |
649 | |
650 | end: | |
651 | lttng_event_rule_put(event_rule); | |
652 | lttng_condition_put(condition); | |
38114013 | 653 | return consumed_length; |
683d081a JR |
654 | } |
655 | ||
656 | LTTNG_HIDDEN | |
657 | enum lttng_condition_status lttng_condition_event_rule_borrow_rule_mutable( | |
658 | const struct lttng_condition *condition, | |
659 | struct lttng_event_rule **rule) | |
660 | { | |
661 | struct lttng_condition_event_rule *event_rule; | |
662 | enum lttng_condition_status status = LTTNG_CONDITION_STATUS_OK; | |
663 | ||
664 | if (!condition || !IS_EVENT_RULE_CONDITION(condition) || !rule) { | |
665 | status = LTTNG_CONDITION_STATUS_INVALID; | |
666 | goto end; | |
667 | } | |
668 | ||
669 | event_rule = container_of( | |
670 | condition, struct lttng_condition_event_rule, parent); | |
671 | if (!event_rule->rule) { | |
672 | status = LTTNG_CONDITION_STATUS_UNSET; | |
673 | goto end; | |
674 | } | |
675 | ||
676 | *rule = event_rule->rule; | |
677 | end: | |
678 | return status; | |
679 | } | |
680 | ||
681 | enum lttng_condition_status lttng_condition_event_rule_get_rule( | |
682 | const struct lttng_condition *condition, | |
683 | const struct lttng_event_rule **rule) | |
684 | { | |
685 | struct lttng_event_rule *mutable_rule = NULL; | |
686 | const enum lttng_condition_status status = | |
687 | lttng_condition_event_rule_borrow_rule_mutable( | |
688 | condition, &mutable_rule); | |
689 | ||
690 | *rule = mutable_rule; | |
691 | return status; | |
692 | } | |
693 | ||
38114013 PP |
694 | enum lttng_condition_status |
695 | lttng_condition_event_rule_append_capture_descriptor( | |
696 | struct lttng_condition *condition, | |
697 | struct lttng_event_expr *expr) | |
698 | { | |
699 | int ret; | |
700 | enum lttng_condition_status status = LTTNG_CONDITION_STATUS_OK; | |
701 | struct lttng_condition_event_rule *event_rule_cond = | |
702 | container_of(condition, | |
703 | struct lttng_condition_event_rule, parent); | |
0912b5ea | 704 | struct lttng_capture_descriptor *descriptor = NULL; |
38114013 PP |
705 | |
706 | /* Only accept l-values. */ | |
707 | if (!condition || !IS_EVENT_RULE_CONDITION(condition) || !expr || | |
708 | !lttng_event_expr_is_lvalue(expr)) { | |
709 | status = LTTNG_CONDITION_STATUS_INVALID; | |
710 | goto end; | |
711 | } | |
712 | ||
0912b5ea JR |
713 | descriptor = malloc(sizeof(*descriptor)); |
714 | if (descriptor == NULL) { | |
715 | status = LTTNG_CONDITION_STATUS_ERROR; | |
716 | goto end; | |
717 | } | |
718 | ||
719 | descriptor->event_expression = expr; | |
720 | descriptor->bytecode = NULL; | |
721 | ||
38114013 | 722 | ret = lttng_dynamic_pointer_array_add_pointer( |
0912b5ea | 723 | &event_rule_cond->capture_descriptors, descriptor); |
38114013 PP |
724 | if (ret) { |
725 | status = LTTNG_CONDITION_STATUS_ERROR; | |
726 | goto end; | |
727 | } | |
728 | ||
0912b5ea JR |
729 | /* Ownership is transfered to the internal capture_descriptors array */ |
730 | descriptor = NULL; | |
38114013 | 731 | end: |
0912b5ea | 732 | free(descriptor); |
38114013 PP |
733 | return status; |
734 | } | |
735 | ||
736 | enum lttng_condition_status | |
737 | lttng_condition_event_rule_get_capture_descriptor_count( | |
738 | const struct lttng_condition *condition, unsigned int *count) | |
739 | { | |
740 | enum lttng_condition_status status = LTTNG_CONDITION_STATUS_OK; | |
741 | const struct lttng_condition_event_rule *event_rule_cond = | |
742 | container_of(condition, | |
743 | const struct lttng_condition_event_rule, | |
744 | parent); | |
745 | ||
746 | if (!condition || !IS_EVENT_RULE_CONDITION(condition) || !count) { | |
747 | status = LTTNG_CONDITION_STATUS_INVALID; | |
748 | goto end; | |
749 | } | |
750 | ||
751 | *count = lttng_dynamic_pointer_array_get_count( | |
752 | &event_rule_cond->capture_descriptors); | |
753 | ||
754 | end: | |
755 | return status; | |
756 | } | |
757 | ||
758 | const struct lttng_event_expr * | |
759 | lttng_condition_event_rule_get_capture_descriptor_at_index( | |
760 | const struct lttng_condition *condition, unsigned int index) | |
761 | { | |
38114013 | 762 | const struct lttng_event_expr *expr = NULL; |
6fb7c690 | 763 | const struct lttng_capture_descriptor *desc = NULL; |
0912b5ea | 764 | |
6fb7c690 JR |
765 | desc = lttng_condition_event_rule_get_internal_capture_descriptor_at_index( |
766 | condition, index); | |
767 | if (desc == NULL) { | |
38114013 PP |
768 | goto end; |
769 | } | |
0912b5ea | 770 | expr = desc->event_expression; |
38114013 PP |
771 | |
772 | end: | |
773 | return expr; | |
774 | } | |
775 | ||
683d081a JR |
776 | LTTNG_HIDDEN |
777 | ssize_t lttng_evaluation_event_rule_create_from_payload( | |
778 | struct lttng_payload_view *view, | |
779 | struct lttng_evaluation **_evaluation) | |
780 | { | |
781 | ssize_t ret, offset = 0; | |
782 | const char *trigger_name; | |
783 | struct lttng_evaluation *evaluation = NULL; | |
784 | const struct lttng_evaluation_event_rule_comm *header; | |
785 | const struct lttng_payload_view header_view = | |
786 | lttng_payload_view_from_view( | |
787 | view, 0, sizeof(*header)); | |
788 | ||
789 | if (!_evaluation) { | |
790 | ret = -1; | |
791 | goto error; | |
792 | } | |
793 | ||
794 | if (!lttng_payload_view_is_valid(&header_view)) { | |
795 | ERR("Failed to initialize from malformed event rule evaluation: buffer too short to contain header"); | |
796 | ret = -1; | |
797 | goto error; | |
798 | } | |
799 | ||
800 | header = (typeof(header)) header_view.buffer.data; | |
801 | ||
802 | /* Map the originating trigger's name. */ | |
803 | offset += sizeof(*header); | |
804 | { | |
805 | struct lttng_payload_view current_view = | |
806 | lttng_payload_view_from_view(view, offset, | |
807 | header->trigger_name_length); | |
808 | ||
809 | if (!lttng_payload_view_is_valid(¤t_view)) { | |
810 | ERR("Failed to initialize from malformed event rule evaluation: buffer too short to contain trigger name"); | |
811 | ret = -1; | |
812 | goto error; | |
813 | } | |
814 | ||
815 | trigger_name = current_view.buffer.data; | |
816 | if (!lttng_buffer_view_contains_string(¤t_view.buffer, | |
817 | trigger_name, header->trigger_name_length)) { | |
818 | ERR("Failed to initialize from malformed event rule evaluation: invalid trigger name"); | |
819 | ret = -1; | |
820 | goto error; | |
821 | } | |
822 | } | |
823 | ||
824 | offset += header->trigger_name_length; | |
825 | ||
826 | evaluation = lttng_evaluation_event_rule_create(trigger_name); | |
827 | if (!evaluation) { | |
828 | ret = -1; | |
829 | goto error; | |
830 | } | |
831 | ||
832 | *_evaluation = evaluation; | |
833 | evaluation = NULL; | |
834 | ret = offset; | |
835 | ||
836 | error: | |
837 | lttng_evaluation_destroy(evaluation); | |
838 | return ret; | |
839 | } | |
840 | ||
841 | static int lttng_evaluation_event_rule_serialize( | |
842 | const struct lttng_evaluation *evaluation, | |
843 | struct lttng_payload *payload) | |
844 | { | |
845 | int ret = 0; | |
846 | struct lttng_evaluation_event_rule *hit; | |
847 | struct lttng_evaluation_event_rule_comm comm; | |
848 | ||
849 | hit = container_of( | |
850 | evaluation, struct lttng_evaluation_event_rule, parent); | |
851 | ||
852 | assert(hit->name); | |
853 | comm.trigger_name_length = strlen(hit->name) + 1; | |
854 | ||
855 | ret = lttng_dynamic_buffer_append( | |
856 | &payload->buffer, &comm, sizeof(comm)); | |
857 | if (ret) { | |
858 | goto end; | |
859 | } | |
860 | ||
861 | ret = lttng_dynamic_buffer_append( | |
862 | &payload->buffer, hit->name, comm.trigger_name_length); | |
863 | end: | |
864 | return ret; | |
865 | } | |
866 | ||
867 | static void lttng_evaluation_event_rule_destroy( | |
868 | struct lttng_evaluation *evaluation) | |
869 | { | |
870 | struct lttng_evaluation_event_rule *hit; | |
871 | ||
872 | hit = container_of( | |
873 | evaluation, struct lttng_evaluation_event_rule, parent); | |
874 | free(hit->name); | |
875 | free(hit); | |
876 | } | |
877 | ||
878 | LTTNG_HIDDEN | |
879 | struct lttng_evaluation *lttng_evaluation_event_rule_create( | |
880 | const char *trigger_name) | |
881 | { | |
882 | struct lttng_evaluation_event_rule *hit; | |
883 | struct lttng_evaluation *evaluation = NULL; | |
884 | ||
885 | hit = zmalloc(sizeof(struct lttng_evaluation_event_rule)); | |
886 | if (!hit) { | |
887 | goto end; | |
888 | } | |
889 | ||
890 | hit->name = strdup(trigger_name); | |
891 | if (!hit->name) { | |
892 | goto end; | |
893 | } | |
894 | ||
895 | hit->parent.type = LTTNG_CONDITION_TYPE_EVENT_RULE_HIT; | |
896 | hit->parent.serialize = lttng_evaluation_event_rule_serialize; | |
897 | hit->parent.destroy = lttng_evaluation_event_rule_destroy; | |
898 | ||
899 | evaluation = &hit->parent; | |
900 | hit = NULL; | |
901 | ||
902 | end: | |
903 | if (hit) { | |
904 | lttng_evaluation_event_rule_destroy(&hit->parent); | |
905 | } | |
906 | ||
907 | return evaluation; | |
908 | } | |
909 | ||
910 | enum lttng_evaluation_status lttng_evaluation_event_rule_get_trigger_name( | |
911 | const struct lttng_evaluation *evaluation, const char **name) | |
912 | { | |
913 | struct lttng_evaluation_event_rule *hit; | |
914 | enum lttng_evaluation_status status = LTTNG_EVALUATION_STATUS_OK; | |
915 | ||
916 | if (!evaluation || !is_event_rule_evaluation(evaluation) || !name) { | |
917 | status = LTTNG_EVALUATION_STATUS_INVALID; | |
918 | goto end; | |
919 | } | |
920 | ||
921 | hit = container_of( | |
922 | evaluation, struct lttng_evaluation_event_rule, parent); | |
923 | *name = hit->name; | |
924 | end: | |
925 | return status; | |
926 | } | |
834966af JR |
927 | |
928 | LTTNG_HIDDEN | |
929 | enum lttng_error_code | |
930 | lttng_condition_event_rule_generate_capture_descriptor_bytecode( | |
931 | struct lttng_condition *condition) | |
932 | { | |
933 | enum lttng_error_code ret; | |
934 | enum lttng_condition_status status; | |
935 | unsigned int capture_count, i; | |
936 | ||
937 | if (!condition || !IS_EVENT_RULE_CONDITION(condition)) { | |
938 | ret = LTTNG_ERR_FATAL; | |
939 | goto end; | |
940 | } | |
941 | ||
942 | status = lttng_condition_event_rule_get_capture_descriptor_count( | |
943 | condition, &capture_count); | |
944 | if (status != LTTNG_CONDITION_STATUS_OK) { | |
945 | ret = LTTNG_ERR_FATAL; | |
946 | goto end; | |
947 | } | |
948 | ||
949 | for (i = 0; i < capture_count; i++) { | |
950 | struct lttng_capture_descriptor *local_capture_desc = | |
951 | lttng_condition_event_rule_get_internal_capture_descriptor_at_index( | |
952 | condition, i); | |
953 | ||
954 | if (local_capture_desc == NULL) { | |
955 | ret = LTTNG_ERR_FATAL; | |
956 | goto end; | |
957 | } | |
958 | ||
959 | /* Generate the bytecode. */ | |
960 | status = lttng_event_expr_to_bytecode( | |
961 | local_capture_desc->event_expression, | |
962 | &local_capture_desc->bytecode); | |
963 | if (status < 0 || local_capture_desc->bytecode == NULL) { | |
964 | ret = LTTNG_ERR_INVALID_CAPTURE_EXPRESSION; | |
965 | goto end; | |
966 | } | |
967 | } | |
968 | ||
969 | /* Everything went better than expected */ | |
970 | ret = LTTNG_OK; | |
971 | ||
972 | end: | |
973 | return ret; | |
974 | } |