Commit | Line | Data |
---|---|---|
a58c490f | 1 | /* |
ab5be9fa | 2 | * Copyright (C) 2017 Jérémie Galarneau <jeremie.galarneau@efficios.com> |
a58c490f | 3 | * |
ab5be9fa | 4 | * SPDX-License-Identifier: LGPL-2.1-only |
a58c490f | 5 | * |
a58c490f JG |
6 | */ |
7 | ||
8 | #include <lttng/trigger/trigger-internal.h> | |
9 | #include <lttng/condition/condition-internal.h> | |
e393070a JR |
10 | #include <lttng/condition/on-event-internal.h> |
11 | #include <lttng/condition/on-event.h> | |
12 | #include <lttng/condition/on-event-internal.h> | |
91c96f62 JR |
13 | #include <lttng/condition/buffer-usage.h> |
14 | #include <lttng/event-rule/event-rule-internal.h> | |
f2e97f59 | 15 | #include <lttng/event-expr-internal.h> |
a58c490f | 16 | #include <lttng/action/action-internal.h> |
3da864a9 | 17 | #include <common/credentials.h> |
9e620ea7 JG |
18 | #include <common/payload.h> |
19 | #include <common/payload-view.h> | |
91c96f62 | 20 | #include <lttng/domain.h> |
a58c490f | 21 | #include <common/error.h> |
a02903c0 | 22 | #include <common/dynamic-array.h> |
3da864a9 | 23 | #include <common/optional.h> |
a58c490f | 24 | #include <assert.h> |
242388e4 | 25 | #include <inttypes.h> |
a58c490f JG |
26 | |
27 | LTTNG_HIDDEN | |
b61776fb | 28 | bool lttng_trigger_validate(const struct lttng_trigger *trigger) |
a58c490f JG |
29 | { |
30 | bool valid; | |
31 | ||
32 | if (!trigger) { | |
33 | valid = false; | |
34 | goto end; | |
35 | } | |
36 | ||
64eafdf6 JR |
37 | if (!trigger->creds.uid.is_set) { |
38 | valid = false; | |
39 | goto end; | |
40 | } | |
41 | ||
a58c490f JG |
42 | valid = lttng_condition_validate(trigger->condition) && |
43 | lttng_action_validate(trigger->action); | |
44 | end: | |
45 | return valid; | |
46 | } | |
47 | ||
48 | struct lttng_trigger *lttng_trigger_create( | |
49 | struct lttng_condition *condition, | |
50 | struct lttng_action *action) | |
51 | { | |
52 | struct lttng_trigger *trigger = NULL; | |
53 | ||
54 | if (!condition || !action) { | |
55 | goto end; | |
56 | } | |
57 | ||
58 | trigger = zmalloc(sizeof(struct lttng_trigger)); | |
59 | if (!trigger) { | |
60 | goto end; | |
61 | } | |
62 | ||
f01d28b4 JR |
63 | urcu_ref_init(&trigger->ref); |
64 | ||
7ca172c1 | 65 | lttng_condition_get(condition); |
a58c490f | 66 | trigger->condition = condition; |
7ca172c1 JR |
67 | |
68 | lttng_action_get(action); | |
a58c490f | 69 | trigger->action = action; |
3da864a9 | 70 | |
a58c490f JG |
71 | end: |
72 | return trigger; | |
73 | } | |
74 | ||
7ca172c1 JR |
75 | /* |
76 | * Note: the lack of reference counting 'get' on the condition object is normal. | |
77 | * This API was exposed as such in 2.11. The client is not expected to call | |
78 | * lttng_condition_destroy on the returned object. | |
79 | */ | |
a58c490f JG |
80 | struct lttng_condition *lttng_trigger_get_condition( |
81 | struct lttng_trigger *trigger) | |
82 | { | |
83 | return trigger ? trigger->condition : NULL; | |
84 | } | |
85 | ||
9b63a4aa JG |
86 | const struct lttng_condition *lttng_trigger_get_const_condition( |
87 | const struct lttng_trigger *trigger) | |
88 | { | |
0de2479d | 89 | return trigger ? trigger->condition : NULL; |
9b63a4aa JG |
90 | } |
91 | ||
7ca172c1 JR |
92 | /* |
93 | * Note: the lack of reference counting 'get' on the action object is normal. | |
94 | * This API was exposed as such in 2.11. The client is not expected to call | |
95 | * lttng_action_destroy on the returned object. | |
96 | */ | |
e2ba1c78 | 97 | struct lttng_action *lttng_trigger_get_action( |
a58c490f JG |
98 | struct lttng_trigger *trigger) |
99 | { | |
100 | return trigger ? trigger->action : NULL; | |
101 | } | |
102 | ||
9b63a4aa JG |
103 | const struct lttng_action *lttng_trigger_get_const_action( |
104 | const struct lttng_trigger *trigger) | |
105 | { | |
0de2479d | 106 | return trigger ? trigger->action : NULL; |
9b63a4aa JG |
107 | } |
108 | ||
f01d28b4 | 109 | static void trigger_destroy_ref(struct urcu_ref *ref) |
a58c490f | 110 | { |
f01d28b4 JR |
111 | struct lttng_trigger *trigger = |
112 | container_of(ref, struct lttng_trigger, ref); | |
7ca172c1 JR |
113 | struct lttng_action *action = lttng_trigger_get_action(trigger); |
114 | struct lttng_condition *condition = | |
115 | lttng_trigger_get_condition(trigger); | |
116 | ||
7ca172c1 JR |
117 | assert(action); |
118 | assert(condition); | |
119 | ||
120 | /* Release ownership. */ | |
121 | lttng_action_put(action); | |
122 | lttng_condition_put(condition); | |
123 | ||
242388e4 | 124 | free(trigger->name); |
a58c490f JG |
125 | free(trigger); |
126 | } | |
127 | ||
f01d28b4 JR |
128 | void lttng_trigger_destroy(struct lttng_trigger *trigger) |
129 | { | |
130 | lttng_trigger_put(trigger); | |
131 | } | |
132 | ||
a58c490f | 133 | LTTNG_HIDDEN |
c0a66c84 JG |
134 | ssize_t lttng_trigger_create_from_payload( |
135 | struct lttng_payload_view *src_view, | |
6808ef55 | 136 | struct lttng_trigger **_trigger) |
a58c490f | 137 | { |
242388e4 | 138 | ssize_t ret, offset = 0, condition_size, action_size, name_size = 0; |
a58c490f JG |
139 | struct lttng_condition *condition = NULL; |
140 | struct lttng_action *action = NULL; | |
141 | const struct lttng_trigger_comm *trigger_comm; | |
242388e4 | 142 | const char *name = NULL; |
64eafdf6 JR |
143 | struct lttng_credentials creds = { |
144 | .uid = LTTNG_OPTIONAL_INIT_UNSET, | |
145 | .gid = LTTNG_OPTIONAL_INIT_UNSET, | |
146 | }; | |
6808ef55 | 147 | struct lttng_trigger *trigger = NULL; |
3e6e0df2 JG |
148 | const struct lttng_payload_view trigger_comm_view = |
149 | lttng_payload_view_from_view( | |
150 | src_view, 0, sizeof(*trigger_comm)); | |
a58c490f | 151 | |
6808ef55 | 152 | if (!src_view || !_trigger) { |
a58c490f JG |
153 | ret = -1; |
154 | goto end; | |
155 | } | |
156 | ||
3e6e0df2 JG |
157 | if (!lttng_payload_view_is_valid(&trigger_comm_view)) { |
158 | /* Payload not large enough to contain the header. */ | |
159 | ret = -1; | |
160 | goto end; | |
161 | } | |
162 | ||
a58c490f | 163 | /* lttng_trigger_comm header */ |
3e6e0df2 | 164 | trigger_comm = (typeof(trigger_comm)) trigger_comm_view.buffer.data; |
64eafdf6 JR |
165 | |
166 | /* Set the trigger's creds. */ | |
167 | if (trigger_comm->uid > (uint64_t) ((uid_t) -1)) { | |
168 | /* UID out of range for this platform. */ | |
169 | ret = -1; | |
170 | goto end; | |
171 | } | |
172 | ||
173 | LTTNG_OPTIONAL_SET(&creds.uid, trigger_comm->uid); | |
174 | ||
a58c490f | 175 | offset += sizeof(*trigger_comm); |
242388e4 JR |
176 | |
177 | if (trigger_comm->name_length != 0) { | |
178 | /* Name. */ | |
179 | const struct lttng_payload_view name_view = | |
180 | lttng_payload_view_from_view( | |
3e6e0df2 JG |
181 | src_view, offset, |
182 | trigger_comm->name_length); | |
183 | ||
184 | if (!lttng_payload_view_is_valid(&name_view)) { | |
185 | ret = -1; | |
186 | goto end; | |
187 | } | |
242388e4 JR |
188 | |
189 | name = name_view.buffer.data; | |
190 | if (!lttng_buffer_view_contains_string(&name_view.buffer, name, | |
191 | trigger_comm->name_length)) { | |
192 | ret = -1; | |
193 | goto end; | |
194 | } | |
195 | ||
196 | offset += trigger_comm->name_length; | |
197 | name_size = trigger_comm->name_length; | |
198 | } | |
199 | ||
c0a66c84 JG |
200 | { |
201 | /* struct lttng_condition */ | |
202 | struct lttng_payload_view condition_view = | |
203 | lttng_payload_view_from_view( | |
204 | src_view, offset, -1); | |
205 | ||
206 | condition_size = lttng_condition_create_from_payload(&condition_view, | |
207 | &condition); | |
208 | } | |
a58c490f | 209 | |
a58c490f JG |
210 | if (condition_size < 0) { |
211 | ret = condition_size; | |
212 | goto end; | |
213 | } | |
c0a66c84 | 214 | |
a58c490f | 215 | offset += condition_size; |
c0a66c84 JG |
216 | { |
217 | /* struct lttng_action */ | |
218 | struct lttng_payload_view action_view = | |
219 | lttng_payload_view_from_view( | |
220 | src_view, offset, -1); | |
221 | ||
222 | action_size = lttng_action_create_from_payload(&action_view, &action); | |
223 | } | |
a58c490f | 224 | |
a58c490f JG |
225 | if (action_size < 0) { |
226 | ret = action_size; | |
227 | goto end; | |
228 | } | |
229 | offset += action_size; | |
230 | ||
231 | /* Unexpected size of inner-elements; the buffer is corrupted. */ | |
242388e4 | 232 | if ((ssize_t) trigger_comm->length != condition_size + action_size + name_size) { |
a58c490f JG |
233 | ret = -1; |
234 | goto error; | |
235 | } | |
236 | ||
6808ef55 JG |
237 | trigger = lttng_trigger_create(condition, action); |
238 | if (!trigger) { | |
a58c490f JG |
239 | ret = -1; |
240 | goto error; | |
241 | } | |
c0a66c84 | 242 | |
6808ef55 | 243 | lttng_trigger_set_credentials(trigger, &creds); |
64eafdf6 | 244 | |
7ca172c1 JR |
245 | /* |
246 | * The trigger object owns references to the action and condition | |
247 | * objects. | |
248 | */ | |
249 | lttng_condition_put(condition); | |
250 | condition = NULL; | |
251 | ||
252 | lttng_action_put(action); | |
253 | action = NULL; | |
254 | ||
242388e4 JR |
255 | if (name) { |
256 | const enum lttng_trigger_status status = | |
6808ef55 | 257 | lttng_trigger_set_name(trigger, name); |
242388e4 JR |
258 | |
259 | if (status != LTTNG_TRIGGER_STATUS_OK) { | |
260 | ret = -1; | |
261 | goto end; | |
262 | } | |
263 | } | |
264 | ||
a58c490f | 265 | ret = offset; |
7ca172c1 | 266 | |
a58c490f | 267 | error: |
1065801b JG |
268 | lttng_condition_put(condition); |
269 | lttng_action_put(action); | |
7ca172c1 | 270 | end: |
f5d98ed9 | 271 | if (ret >= 0) { |
6808ef55 JG |
272 | *_trigger = trigger; |
273 | } else { | |
274 | lttng_trigger_put(trigger); | |
275 | } | |
276 | ||
a58c490f JG |
277 | return ret; |
278 | } | |
279 | ||
280 | /* | |
a58c490f JG |
281 | * Both elements are stored contiguously, see their "*_comm" structure |
282 | * for the detailed format. | |
283 | */ | |
284 | LTTNG_HIDDEN | |
a02903c0 | 285 | int lttng_trigger_serialize(const struct lttng_trigger *trigger, |
c0a66c84 | 286 | struct lttng_payload *payload) |
a58c490f | 287 | { |
3647288f | 288 | int ret; |
242388e4 | 289 | size_t header_offset, size_before_payload, size_name; |
c0a66c84 | 290 | struct lttng_trigger_comm trigger_comm = {}; |
3647288f | 291 | struct lttng_trigger_comm *header; |
64eafdf6 JR |
292 | const struct lttng_credentials *creds = NULL; |
293 | ||
294 | creds = lttng_trigger_get_credentials(trigger); | |
295 | assert(creds); | |
296 | ||
297 | trigger_comm.uid = LTTNG_OPTIONAL_GET(creds->uid); | |
a58c490f | 298 | |
242388e4 JR |
299 | if (trigger->name != NULL) { |
300 | size_name = strlen(trigger->name) + 1; | |
301 | } else { | |
302 | size_name = 0; | |
303 | } | |
304 | ||
305 | trigger_comm.name_length = size_name; | |
306 | ||
c0a66c84 JG |
307 | header_offset = payload->buffer.size; |
308 | ret = lttng_dynamic_buffer_append(&payload->buffer, &trigger_comm, | |
3647288f JG |
309 | sizeof(trigger_comm)); |
310 | if (ret) { | |
a58c490f JG |
311 | goto end; |
312 | } | |
313 | ||
c0a66c84 | 314 | size_before_payload = payload->buffer.size; |
242388e4 JR |
315 | |
316 | /* Trigger name. */ | |
317 | ret = lttng_dynamic_buffer_append( | |
318 | &payload->buffer, trigger->name, size_name); | |
319 | if (ret) { | |
320 | goto end; | |
321 | } | |
322 | ||
c0a66c84 | 323 | ret = lttng_condition_serialize(trigger->condition, payload); |
3647288f | 324 | if (ret) { |
a58c490f JG |
325 | goto end; |
326 | } | |
a58c490f | 327 | |
c0a66c84 | 328 | ret = lttng_action_serialize(trigger->action, payload); |
3647288f | 329 | if (ret) { |
a58c490f JG |
330 | goto end; |
331 | } | |
a58c490f | 332 | |
3647288f | 333 | /* Update payload size. */ |
c0a66c84 JG |
334 | header = (typeof(header)) (payload->buffer.data + header_offset); |
335 | header->length = payload->buffer.size - size_before_payload; | |
a58c490f JG |
336 | end: |
337 | return ret; | |
338 | } | |
3da864a9 | 339 | |
85c06c44 JR |
340 | LTTNG_HIDDEN |
341 | bool lttng_trigger_is_equal( | |
342 | const struct lttng_trigger *a, const struct lttng_trigger *b) | |
343 | { | |
1ca78886 FD |
344 | if (strcmp(a->name, b->name) != 0) { |
345 | return false; | |
346 | } | |
347 | ||
85c06c44 JR |
348 | if (!lttng_condition_is_equal(a->condition, b->condition)) { |
349 | return false; | |
350 | } | |
351 | ||
352 | if (!lttng_action_is_equal(a->action, b->action)) { | |
353 | return false; | |
354 | } | |
355 | ||
356 | if (!lttng_credentials_is_equal(lttng_trigger_get_credentials(a), | |
357 | lttng_trigger_get_credentials(b))) { | |
358 | return false; | |
359 | } | |
360 | ||
361 | return true; | |
362 | } | |
363 | ||
242388e4 JR |
364 | enum lttng_trigger_status lttng_trigger_set_name(struct lttng_trigger *trigger, |
365 | const char* name) | |
366 | { | |
367 | char *name_copy = NULL; | |
368 | enum lttng_trigger_status status = LTTNG_TRIGGER_STATUS_OK; | |
369 | ||
370 | if (!trigger || !name || | |
371 | strlen(name) == 0) { | |
372 | status = LTTNG_TRIGGER_STATUS_INVALID; | |
373 | goto end; | |
374 | } | |
375 | ||
376 | name_copy = strdup(name); | |
377 | if (!name_copy) { | |
378 | status = LTTNG_TRIGGER_STATUS_ERROR; | |
379 | goto end; | |
380 | } | |
381 | ||
382 | free(trigger->name); | |
383 | ||
384 | trigger->name = name_copy; | |
385 | name_copy = NULL; | |
386 | end: | |
387 | return status; | |
388 | } | |
389 | ||
390 | enum lttng_trigger_status lttng_trigger_get_name( | |
391 | const struct lttng_trigger *trigger, const char **name) | |
392 | { | |
393 | enum lttng_trigger_status status = LTTNG_TRIGGER_STATUS_OK; | |
394 | ||
395 | if (!trigger || !name) { | |
396 | status = LTTNG_TRIGGER_STATUS_INVALID; | |
397 | goto end; | |
398 | } | |
399 | ||
400 | if (!trigger->name) { | |
401 | status = LTTNG_TRIGGER_STATUS_UNSET; | |
402 | } | |
403 | ||
404 | *name = trigger->name; | |
405 | end: | |
406 | return status; | |
407 | } | |
408 | ||
409 | LTTNG_HIDDEN | |
410 | int lttng_trigger_assign_name(struct lttng_trigger *dst, | |
411 | const struct lttng_trigger *src) | |
412 | { | |
413 | int ret = 0; | |
414 | enum lttng_trigger_status status; | |
415 | ||
416 | status = lttng_trigger_set_name(dst, src->name); | |
417 | if (status != LTTNG_TRIGGER_STATUS_OK) { | |
418 | ret = -1; | |
419 | ERR("Failed to set name for trigger"); | |
420 | goto end; | |
421 | } | |
422 | end: | |
423 | return ret; | |
424 | } | |
425 | ||
e6887944 JR |
426 | LTTNG_HIDDEN |
427 | void lttng_trigger_set_tracer_token(struct lttng_trigger *trigger, | |
428 | uint64_t token) | |
429 | { | |
430 | assert(trigger); | |
431 | LTTNG_OPTIONAL_SET(&trigger->tracer_token, token); | |
432 | } | |
433 | ||
434 | LTTNG_HIDDEN | |
435 | uint64_t lttng_trigger_get_tracer_token(const struct lttng_trigger *trigger) | |
436 | { | |
437 | assert(trigger); | |
438 | ||
439 | return LTTNG_OPTIONAL_GET(trigger->tracer_token); | |
440 | } | |
441 | ||
242388e4 JR |
442 | LTTNG_HIDDEN |
443 | int lttng_trigger_generate_name(struct lttng_trigger *trigger, | |
444 | uint64_t unique_id) | |
445 | { | |
446 | int ret = 0; | |
447 | char *generated_name = NULL; | |
448 | ||
449 | ret = asprintf(&generated_name, "T%" PRIu64 "", unique_id); | |
450 | if (ret < 0) { | |
451 | ERR("Failed to generate trigger name"); | |
452 | ret = -1; | |
453 | goto end; | |
454 | } | |
455 | ||
456 | ret = 0; | |
457 | free(trigger->name); | |
458 | trigger->name = generated_name; | |
459 | end: | |
460 | return ret; | |
461 | } | |
462 | ||
f01d28b4 JR |
463 | LTTNG_HIDDEN |
464 | void lttng_trigger_get(struct lttng_trigger *trigger) | |
465 | { | |
466 | urcu_ref_get(&trigger->ref); | |
467 | } | |
468 | ||
469 | LTTNG_HIDDEN | |
470 | void lttng_trigger_put(struct lttng_trigger *trigger) | |
471 | { | |
472 | if (!trigger) { | |
473 | return; | |
474 | } | |
475 | ||
476 | urcu_ref_put(&trigger->ref , trigger_destroy_ref); | |
477 | } | |
478 | ||
a02903c0 JR |
479 | static void delete_trigger_array_element(void *ptr) |
480 | { | |
481 | struct lttng_trigger *trigger = ptr; | |
482 | ||
483 | lttng_trigger_put(trigger); | |
484 | } | |
485 | ||
486 | LTTNG_HIDDEN | |
487 | struct lttng_triggers *lttng_triggers_create(void) | |
488 | { | |
489 | struct lttng_triggers *triggers = NULL; | |
490 | ||
491 | triggers = zmalloc(sizeof(*triggers)); | |
492 | if (!triggers) { | |
493 | goto end; | |
494 | } | |
495 | ||
496 | lttng_dynamic_pointer_array_init(&triggers->array, delete_trigger_array_element); | |
497 | ||
498 | end: | |
499 | return triggers; | |
500 | } | |
501 | ||
502 | LTTNG_HIDDEN | |
503 | struct lttng_trigger *lttng_triggers_borrow_mutable_at_index( | |
504 | const struct lttng_triggers *triggers, unsigned int index) | |
505 | { | |
506 | struct lttng_trigger *trigger = NULL; | |
507 | ||
508 | assert(triggers); | |
509 | if (index >= lttng_dynamic_pointer_array_get_count(&triggers->array)) { | |
510 | goto end; | |
511 | } | |
512 | ||
513 | trigger = (struct lttng_trigger *) | |
514 | lttng_dynamic_pointer_array_get_pointer( | |
515 | &triggers->array, index); | |
516 | end: | |
517 | return trigger; | |
518 | } | |
519 | ||
520 | LTTNG_HIDDEN | |
521 | int lttng_triggers_add( | |
522 | struct lttng_triggers *triggers, struct lttng_trigger *trigger) | |
523 | { | |
524 | int ret; | |
525 | ||
526 | assert(triggers); | |
527 | assert(trigger); | |
528 | ||
529 | lttng_trigger_get(trigger); | |
530 | ||
531 | ret = lttng_dynamic_pointer_array_add_pointer(&triggers->array, trigger); | |
532 | if (ret) { | |
533 | lttng_trigger_put(trigger); | |
534 | } | |
535 | ||
536 | return ret; | |
537 | } | |
538 | ||
539 | const struct lttng_trigger *lttng_triggers_get_at_index( | |
540 | const struct lttng_triggers *triggers, unsigned int index) | |
541 | { | |
542 | return lttng_triggers_borrow_mutable_at_index(triggers, index); | |
543 | } | |
544 | ||
545 | enum lttng_trigger_status lttng_triggers_get_count(const struct lttng_triggers *triggers, unsigned int *count) | |
546 | { | |
547 | enum lttng_trigger_status status = LTTNG_TRIGGER_STATUS_OK; | |
548 | ||
549 | if (!triggers || !count) { | |
550 | status = LTTNG_TRIGGER_STATUS_INVALID; | |
551 | goto end; | |
552 | } | |
553 | ||
554 | *count = lttng_dynamic_pointer_array_get_count(&triggers->array); | |
555 | end: | |
556 | return status; | |
557 | } | |
558 | ||
559 | void lttng_triggers_destroy(struct lttng_triggers *triggers) | |
560 | { | |
561 | if (!triggers) { | |
562 | return; | |
563 | } | |
564 | ||
565 | lttng_dynamic_pointer_array_reset(&triggers->array); | |
566 | free(triggers); | |
567 | } | |
568 | ||
569 | int lttng_triggers_serialize(const struct lttng_triggers *triggers, | |
570 | struct lttng_payload *payload) | |
571 | { | |
572 | int ret; | |
573 | unsigned int i, count; | |
574 | size_t size_before_payload; | |
575 | struct lttng_triggers_comm triggers_comm = {}; | |
576 | struct lttng_triggers_comm *header; | |
577 | enum lttng_trigger_status status; | |
578 | const size_t header_offset = payload->buffer.size; | |
579 | ||
580 | status = lttng_triggers_get_count(triggers, &count); | |
581 | if (status != LTTNG_TRIGGER_STATUS_OK) { | |
582 | ret = LTTNG_ERR_INVALID; | |
583 | goto end; | |
584 | } | |
585 | ||
586 | triggers_comm.count = count; | |
587 | ||
588 | /* Placeholder header; updated at the end. */ | |
589 | ret = lttng_dynamic_buffer_append(&payload->buffer, &triggers_comm, | |
590 | sizeof(triggers_comm)); | |
591 | if (ret) { | |
592 | goto end; | |
593 | } | |
594 | ||
595 | size_before_payload = payload->buffer.size; | |
596 | ||
597 | for (i = 0; i < count; i++) { | |
598 | const struct lttng_trigger *trigger = | |
599 | lttng_triggers_get_at_index(triggers, i); | |
600 | ||
601 | assert(trigger); | |
602 | ||
603 | ret = lttng_trigger_serialize(trigger, payload); | |
604 | if (ret) { | |
605 | goto end; | |
606 | } | |
607 | } | |
608 | ||
609 | /* Update payload size. */ | |
610 | header = (struct lttng_triggers_comm *) ((char *) payload->buffer.data + header_offset); | |
611 | header->length = payload->buffer.size - size_before_payload; | |
612 | end: | |
613 | return ret; | |
614 | } | |
615 | ||
616 | LTTNG_HIDDEN | |
617 | ssize_t lttng_triggers_create_from_payload( | |
618 | struct lttng_payload_view *src_view, | |
619 | struct lttng_triggers **triggers) | |
620 | { | |
621 | ssize_t ret, offset = 0, triggers_size = 0; | |
622 | unsigned int i; | |
623 | const struct lttng_triggers_comm *triggers_comm; | |
624 | struct lttng_triggers *local_triggers = NULL; | |
625 | ||
626 | if (!src_view || !triggers) { | |
627 | ret = -1; | |
628 | goto error; | |
629 | } | |
630 | ||
631 | /* lttng_trigger_comms header */ | |
632 | triggers_comm = (const struct lttng_triggers_comm *) src_view->buffer.data; | |
633 | offset += sizeof(*triggers_comm); | |
634 | ||
635 | local_triggers = lttng_triggers_create(); | |
636 | if (!local_triggers) { | |
637 | ret = -1; | |
638 | goto error; | |
639 | } | |
640 | ||
641 | for (i = 0; i < triggers_comm->count; i++) { | |
642 | struct lttng_trigger *trigger = NULL; | |
643 | struct lttng_payload_view trigger_view = | |
644 | lttng_payload_view_from_view(src_view, offset, -1); | |
645 | ssize_t trigger_size; | |
646 | ||
647 | trigger_size = lttng_trigger_create_from_payload( | |
648 | &trigger_view, &trigger); | |
649 | if (trigger_size < 0) { | |
650 | ret = trigger_size; | |
651 | goto error; | |
652 | } | |
653 | ||
654 | /* Transfer ownership of the trigger to the collection. */ | |
655 | ret = lttng_triggers_add(local_triggers, trigger); | |
656 | lttng_trigger_put(trigger); | |
657 | if (ret < 0) { | |
658 | ret = -1; | |
659 | goto error; | |
660 | } | |
661 | ||
662 | offset += trigger_size; | |
663 | triggers_size += trigger_size; | |
664 | } | |
665 | ||
666 | /* Unexpected size of inner-elements; the buffer is corrupted. */ | |
667 | if ((ssize_t) triggers_comm->length != triggers_size) { | |
668 | ret = -1; | |
669 | goto error; | |
670 | } | |
671 | ||
672 | /* Pass ownership to caller. */ | |
673 | *triggers = local_triggers; | |
674 | local_triggers = NULL; | |
675 | ||
676 | ret = offset; | |
677 | error: | |
678 | ||
679 | lttng_triggers_destroy(local_triggers); | |
680 | return ret; | |
681 | } | |
682 | ||
3da864a9 JR |
683 | LTTNG_HIDDEN |
684 | const struct lttng_credentials *lttng_trigger_get_credentials( | |
685 | const struct lttng_trigger *trigger) | |
686 | { | |
64eafdf6 | 687 | return &trigger->creds; |
3da864a9 JR |
688 | } |
689 | ||
690 | LTTNG_HIDDEN | |
64eafdf6 | 691 | void lttng_trigger_set_credentials(struct lttng_trigger *trigger, |
3da864a9 JR |
692 | const struct lttng_credentials *creds) |
693 | { | |
694 | assert(creds); | |
64eafdf6 JR |
695 | trigger->creds = *creds; |
696 | } | |
697 | ||
698 | enum lttng_trigger_status lttng_trigger_set_owner_uid( | |
699 | struct lttng_trigger *trigger, uid_t uid) | |
700 | { | |
701 | enum lttng_trigger_status ret = LTTNG_TRIGGER_STATUS_OK; | |
702 | const struct lttng_credentials creds = { | |
703 | .uid = LTTNG_OPTIONAL_INIT_VALUE(uid), | |
704 | .gid = LTTNG_OPTIONAL_INIT_UNSET, | |
705 | }; | |
706 | ||
707 | if (!trigger) { | |
708 | ret = LTTNG_TRIGGER_STATUS_INVALID; | |
709 | goto end; | |
710 | } | |
711 | ||
712 | /* Client-side validation only to report a clearer error. */ | |
713 | if (geteuid() != 0) { | |
714 | ret = LTTNG_TRIGGER_STATUS_PERMISSION_DENIED; | |
715 | goto end; | |
716 | } | |
717 | ||
718 | lttng_trigger_set_credentials(trigger, &creds); | |
719 | ||
720 | end: | |
721 | return ret; | |
722 | } | |
723 | ||
724 | enum lttng_trigger_status lttng_trigger_get_owner_uid( | |
725 | const struct lttng_trigger *trigger, uid_t *uid) | |
726 | { | |
727 | enum lttng_trigger_status ret = LTTNG_TRIGGER_STATUS_OK; | |
728 | const struct lttng_credentials *creds = NULL; | |
729 | ||
730 | if (!trigger || !uid ) { | |
731 | ret = LTTNG_TRIGGER_STATUS_INVALID; | |
732 | goto end; | |
733 | } | |
734 | ||
735 | if (!trigger->creds.uid.is_set ) { | |
736 | ret = LTTNG_TRIGGER_STATUS_UNSET; | |
737 | goto end; | |
738 | } | |
739 | ||
740 | creds = lttng_trigger_get_credentials(trigger); | |
741 | *uid = lttng_credentials_get_uid(creds); | |
742 | ||
743 | end: | |
744 | return ret; | |
3da864a9 | 745 | } |
5c504c41 | 746 | |
91c96f62 JR |
747 | LTTNG_HIDDEN |
748 | enum lttng_domain_type lttng_trigger_get_underlying_domain_type_restriction( | |
749 | const struct lttng_trigger *trigger) | |
750 | { | |
751 | enum lttng_domain_type type = LTTNG_DOMAIN_NONE; | |
752 | const struct lttng_event_rule *event_rule; | |
753 | enum lttng_condition_status c_status; | |
754 | enum lttng_condition_type c_type; | |
755 | ||
756 | assert(trigger); | |
757 | assert(trigger->condition); | |
758 | ||
759 | c_type = lttng_condition_get_type(trigger->condition); | |
760 | assert (c_type != LTTNG_CONDITION_TYPE_UNKNOWN); | |
761 | ||
762 | switch (c_type) { | |
763 | case LTTNG_CONDITION_TYPE_SESSION_CONSUMED_SIZE: | |
764 | case LTTNG_CONDITION_TYPE_SESSION_ROTATION_ONGOING: | |
765 | case LTTNG_CONDITION_TYPE_SESSION_ROTATION_COMPLETED: | |
766 | /* Apply to any domain. */ | |
767 | type = LTTNG_DOMAIN_NONE; | |
768 | break; | |
d602bd6a | 769 | case LTTNG_CONDITION_TYPE_ON_EVENT: |
91c96f62 | 770 | /* Return the domain of the event rule. */ |
d602bd6a | 771 | c_status = lttng_condition_on_event_get_rule( |
91c96f62 JR |
772 | trigger->condition, &event_rule); |
773 | assert(c_status == LTTNG_CONDITION_STATUS_OK); | |
774 | type = lttng_event_rule_get_domain_type(event_rule); | |
775 | break; | |
776 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_HIGH: | |
777 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_LOW: | |
778 | /* Return the domain of the channel being monitored. */ | |
779 | c_status = lttng_condition_buffer_usage_get_domain_type( | |
780 | trigger->condition, &type); | |
781 | assert(c_status == LTTNG_CONDITION_STATUS_OK); | |
782 | break; | |
783 | default: | |
784 | abort(); | |
785 | } | |
786 | ||
787 | return type; | |
788 | } | |
58daac01 JR |
789 | |
790 | /* | |
791 | * Generate bytecode related to the trigger. | |
792 | * On success LTTNG_OK. On error, returns lttng_error code. | |
793 | */ | |
794 | LTTNG_HIDDEN | |
795 | enum lttng_error_code lttng_trigger_generate_bytecode( | |
796 | struct lttng_trigger *trigger, | |
797 | const struct lttng_credentials *creds) | |
798 | { | |
799 | enum lttng_error_code ret; | |
800 | struct lttng_condition *condition = NULL; | |
801 | ||
802 | condition = lttng_trigger_get_condition(trigger); | |
803 | if (!condition) { | |
804 | ret = LTTNG_ERR_INVALID_TRIGGER; | |
805 | goto end; | |
806 | } | |
807 | ||
808 | switch (lttng_condition_get_type(condition)) { | |
d602bd6a | 809 | case LTTNG_CONDITION_TYPE_ON_EVENT: |
58daac01 JR |
810 | { |
811 | struct lttng_event_rule *event_rule; | |
812 | const enum lttng_condition_status condition_status = | |
d602bd6a | 813 | lttng_condition_on_event_borrow_rule_mutable( |
58daac01 JR |
814 | condition, &event_rule); |
815 | ||
816 | assert(condition_status == LTTNG_CONDITION_STATUS_OK); | |
f2e97f59 JR |
817 | |
818 | /* Generate the filter bytecode. */ | |
58daac01 JR |
819 | ret = lttng_event_rule_generate_filter_bytecode( |
820 | event_rule, creds); | |
821 | if (ret != LTTNG_OK) { | |
822 | goto end; | |
823 | } | |
824 | ||
f2e97f59 | 825 | /* Generate the capture bytecode. */ |
d602bd6a | 826 | ret = lttng_condition_on_event_generate_capture_descriptor_bytecode( |
f2e97f59 JR |
827 | condition); |
828 | if (ret != LTTNG_OK) { | |
829 | goto end; | |
830 | } | |
831 | ||
58daac01 JR |
832 | ret = LTTNG_OK; |
833 | break; | |
834 | } | |
835 | default: | |
836 | ret = LTTNG_OK; | |
837 | break; | |
838 | } | |
839 | end: | |
840 | return ret; | |
841 | } | |
b61776fb SM |
842 | |
843 | LTTNG_HIDDEN | |
844 | struct lttng_trigger *lttng_trigger_copy(const struct lttng_trigger *trigger) | |
845 | { | |
846 | int ret; | |
847 | struct lttng_payload copy_buffer; | |
848 | struct lttng_trigger *copy = NULL; | |
849 | ||
850 | lttng_payload_init(©_buffer); | |
851 | ||
852 | ret = lttng_trigger_serialize(trigger, ©_buffer); | |
853 | if (ret < 0) { | |
854 | goto end; | |
855 | } | |
856 | ||
857 | { | |
858 | struct lttng_payload_view view = | |
859 | lttng_payload_view_from_payload( | |
860 | ©_buffer, 0, -1); | |
861 | ret = lttng_trigger_create_from_payload( | |
862 | &view, ©); | |
863 | if (ret < 0) { | |
864 | copy = NULL; | |
865 | goto end; | |
866 | } | |
867 | } | |
868 | ||
869 | end: | |
870 | lttng_payload_reset(©_buffer); | |
871 | return copy; | |
872 | } | |
c738df17 FD |
873 | |
874 | LTTNG_HIDDEN | |
875 | bool lttng_trigger_needs_tracer_notifier(const struct lttng_trigger *trigger) | |
876 | { | |
877 | bool needs_tracer_notifier = false; | |
878 | const struct lttng_condition *condition = | |
879 | lttng_trigger_get_const_condition(trigger); | |
880 | ||
881 | switch (lttng_condition_get_type(condition)) { | |
882 | case LTTNG_CONDITION_TYPE_ON_EVENT: | |
883 | needs_tracer_notifier = true; | |
884 | goto end; | |
885 | case LTTNG_CONDITION_TYPE_SESSION_CONSUMED_SIZE: | |
886 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_HIGH: | |
887 | case LTTNG_CONDITION_TYPE_BUFFER_USAGE_LOW: | |
888 | case LTTNG_CONDITION_TYPE_SESSION_ROTATION_ONGOING: | |
889 | case LTTNG_CONDITION_TYPE_SESSION_ROTATION_COMPLETED: | |
890 | goto end; | |
891 | case LTTNG_CONDITION_TYPE_UNKNOWN: | |
892 | default: | |
893 | abort(); | |
894 | } | |
895 | end: | |
896 | return needs_tracer_notifier; | |
897 | } |