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> | |
10 | #include <lttng/action/action-internal.h> | |
3da864a9 | 11 | #include <common/credentials.h> |
9e620ea7 JG |
12 | #include <common/payload.h> |
13 | #include <common/payload-view.h> | |
a58c490f | 14 | #include <common/error.h> |
a02903c0 | 15 | #include <common/dynamic-array.h> |
3da864a9 | 16 | #include <common/optional.h> |
a58c490f | 17 | #include <assert.h> |
242388e4 | 18 | #include <inttypes.h> |
a58c490f JG |
19 | |
20 | LTTNG_HIDDEN | |
21 | bool lttng_trigger_validate(struct lttng_trigger *trigger) | |
22 | { | |
23 | bool valid; | |
24 | ||
25 | if (!trigger) { | |
26 | valid = false; | |
27 | goto end; | |
28 | } | |
29 | ||
64eafdf6 JR |
30 | if (!trigger->creds.uid.is_set) { |
31 | valid = false; | |
32 | goto end; | |
33 | } | |
34 | ||
a58c490f JG |
35 | valid = lttng_condition_validate(trigger->condition) && |
36 | lttng_action_validate(trigger->action); | |
37 | end: | |
38 | return valid; | |
39 | } | |
40 | ||
41 | struct lttng_trigger *lttng_trigger_create( | |
42 | struct lttng_condition *condition, | |
43 | struct lttng_action *action) | |
44 | { | |
45 | struct lttng_trigger *trigger = NULL; | |
46 | ||
47 | if (!condition || !action) { | |
48 | goto end; | |
49 | } | |
50 | ||
51 | trigger = zmalloc(sizeof(struct lttng_trigger)); | |
52 | if (!trigger) { | |
53 | goto end; | |
54 | } | |
55 | ||
f01d28b4 JR |
56 | urcu_ref_init(&trigger->ref); |
57 | ||
7ca172c1 | 58 | lttng_condition_get(condition); |
a58c490f | 59 | trigger->condition = condition; |
7ca172c1 JR |
60 | |
61 | lttng_action_get(action); | |
a58c490f | 62 | trigger->action = action; |
3da864a9 | 63 | |
a58c490f JG |
64 | end: |
65 | return trigger; | |
66 | } | |
67 | ||
7ca172c1 JR |
68 | /* |
69 | * Note: the lack of reference counting 'get' on the condition object is normal. | |
70 | * This API was exposed as such in 2.11. The client is not expected to call | |
71 | * lttng_condition_destroy on the returned object. | |
72 | */ | |
a58c490f JG |
73 | struct lttng_condition *lttng_trigger_get_condition( |
74 | struct lttng_trigger *trigger) | |
75 | { | |
76 | return trigger ? trigger->condition : NULL; | |
77 | } | |
78 | ||
9b63a4aa JG |
79 | LTTNG_HIDDEN |
80 | const struct lttng_condition *lttng_trigger_get_const_condition( | |
81 | const struct lttng_trigger *trigger) | |
82 | { | |
83 | return trigger->condition; | |
84 | } | |
85 | ||
7ca172c1 JR |
86 | |
87 | /* | |
88 | * Note: the lack of reference counting 'get' on the action object is normal. | |
89 | * This API was exposed as such in 2.11. The client is not expected to call | |
90 | * lttng_action_destroy on the returned object. | |
91 | */ | |
e2ba1c78 | 92 | struct lttng_action *lttng_trigger_get_action( |
a58c490f JG |
93 | struct lttng_trigger *trigger) |
94 | { | |
95 | return trigger ? trigger->action : NULL; | |
96 | } | |
97 | ||
9b63a4aa JG |
98 | LTTNG_HIDDEN |
99 | const struct lttng_action *lttng_trigger_get_const_action( | |
100 | const struct lttng_trigger *trigger) | |
101 | { | |
102 | return trigger->action; | |
103 | } | |
104 | ||
f01d28b4 | 105 | static void trigger_destroy_ref(struct urcu_ref *ref) |
a58c490f | 106 | { |
f01d28b4 JR |
107 | struct lttng_trigger *trigger = |
108 | container_of(ref, struct lttng_trigger, ref); | |
7ca172c1 JR |
109 | struct lttng_action *action = lttng_trigger_get_action(trigger); |
110 | struct lttng_condition *condition = | |
111 | lttng_trigger_get_condition(trigger); | |
112 | ||
7ca172c1 JR |
113 | assert(action); |
114 | assert(condition); | |
115 | ||
116 | /* Release ownership. */ | |
117 | lttng_action_put(action); | |
118 | lttng_condition_put(condition); | |
119 | ||
242388e4 | 120 | free(trigger->name); |
a58c490f JG |
121 | free(trigger); |
122 | } | |
123 | ||
f01d28b4 JR |
124 | void lttng_trigger_destroy(struct lttng_trigger *trigger) |
125 | { | |
126 | lttng_trigger_put(trigger); | |
127 | } | |
128 | ||
a58c490f | 129 | LTTNG_HIDDEN |
c0a66c84 JG |
130 | ssize_t lttng_trigger_create_from_payload( |
131 | struct lttng_payload_view *src_view, | |
a58c490f JG |
132 | struct lttng_trigger **trigger) |
133 | { | |
242388e4 | 134 | ssize_t ret, offset = 0, condition_size, action_size, name_size = 0; |
a58c490f JG |
135 | struct lttng_condition *condition = NULL; |
136 | struct lttng_action *action = NULL; | |
137 | const struct lttng_trigger_comm *trigger_comm; | |
242388e4 | 138 | const char *name = NULL; |
64eafdf6 JR |
139 | struct lttng_credentials creds = { |
140 | .uid = LTTNG_OPTIONAL_INIT_UNSET, | |
141 | .gid = LTTNG_OPTIONAL_INIT_UNSET, | |
142 | }; | |
a58c490f JG |
143 | |
144 | if (!src_view || !trigger) { | |
145 | ret = -1; | |
146 | goto end; | |
147 | } | |
148 | ||
149 | /* lttng_trigger_comm header */ | |
c0a66c84 | 150 | trigger_comm = (typeof(trigger_comm)) src_view->buffer.data; |
64eafdf6 JR |
151 | |
152 | /* Set the trigger's creds. */ | |
153 | if (trigger_comm->uid > (uint64_t) ((uid_t) -1)) { | |
154 | /* UID out of range for this platform. */ | |
155 | ret = -1; | |
156 | goto end; | |
157 | } | |
158 | ||
159 | LTTNG_OPTIONAL_SET(&creds.uid, trigger_comm->uid); | |
160 | ||
a58c490f | 161 | offset += sizeof(*trigger_comm); |
242388e4 JR |
162 | |
163 | if (trigger_comm->name_length != 0) { | |
164 | /* Name. */ | |
165 | const struct lttng_payload_view name_view = | |
166 | lttng_payload_view_from_view( | |
167 | src_view, offset, trigger_comm->name_length); | |
168 | ||
169 | name = name_view.buffer.data; | |
170 | if (!lttng_buffer_view_contains_string(&name_view.buffer, name, | |
171 | trigger_comm->name_length)) { | |
172 | ret = -1; | |
173 | goto end; | |
174 | } | |
175 | ||
176 | offset += trigger_comm->name_length; | |
177 | name_size = trigger_comm->name_length; | |
178 | } | |
179 | ||
c0a66c84 JG |
180 | { |
181 | /* struct lttng_condition */ | |
182 | struct lttng_payload_view condition_view = | |
183 | lttng_payload_view_from_view( | |
184 | src_view, offset, -1); | |
185 | ||
186 | condition_size = lttng_condition_create_from_payload(&condition_view, | |
187 | &condition); | |
188 | } | |
a58c490f | 189 | |
a58c490f JG |
190 | if (condition_size < 0) { |
191 | ret = condition_size; | |
192 | goto end; | |
193 | } | |
c0a66c84 | 194 | |
a58c490f | 195 | offset += condition_size; |
c0a66c84 JG |
196 | { |
197 | /* struct lttng_action */ | |
198 | struct lttng_payload_view action_view = | |
199 | lttng_payload_view_from_view( | |
200 | src_view, offset, -1); | |
201 | ||
202 | action_size = lttng_action_create_from_payload(&action_view, &action); | |
203 | } | |
a58c490f | 204 | |
a58c490f JG |
205 | if (action_size < 0) { |
206 | ret = action_size; | |
207 | goto end; | |
208 | } | |
209 | offset += action_size; | |
210 | ||
211 | /* Unexpected size of inner-elements; the buffer is corrupted. */ | |
242388e4 | 212 | if ((ssize_t) trigger_comm->length != condition_size + action_size + name_size) { |
a58c490f JG |
213 | ret = -1; |
214 | goto error; | |
215 | } | |
216 | ||
217 | *trigger = lttng_trigger_create(condition, action); | |
218 | if (!*trigger) { | |
219 | ret = -1; | |
220 | goto error; | |
221 | } | |
c0a66c84 | 222 | |
64eafdf6 JR |
223 | lttng_trigger_set_credentials(*trigger, &creds); |
224 | ||
7ca172c1 JR |
225 | /* |
226 | * The trigger object owns references to the action and condition | |
227 | * objects. | |
228 | */ | |
229 | lttng_condition_put(condition); | |
230 | condition = NULL; | |
231 | ||
232 | lttng_action_put(action); | |
233 | action = NULL; | |
234 | ||
242388e4 JR |
235 | if (name) { |
236 | const enum lttng_trigger_status status = | |
237 | lttng_trigger_set_name(*trigger, name); | |
238 | ||
239 | if (status != LTTNG_TRIGGER_STATUS_OK) { | |
240 | ret = -1; | |
241 | goto end; | |
242 | } | |
243 | } | |
244 | ||
a58c490f | 245 | ret = offset; |
7ca172c1 | 246 | |
a58c490f JG |
247 | error: |
248 | lttng_condition_destroy(condition); | |
249 | lttng_action_destroy(action); | |
7ca172c1 | 250 | end: |
a58c490f JG |
251 | return ret; |
252 | } | |
253 | ||
254 | /* | |
a58c490f JG |
255 | * Both elements are stored contiguously, see their "*_comm" structure |
256 | * for the detailed format. | |
257 | */ | |
258 | LTTNG_HIDDEN | |
a02903c0 | 259 | int lttng_trigger_serialize(const struct lttng_trigger *trigger, |
c0a66c84 | 260 | struct lttng_payload *payload) |
a58c490f | 261 | { |
3647288f | 262 | int ret; |
242388e4 | 263 | size_t header_offset, size_before_payload, size_name; |
c0a66c84 | 264 | struct lttng_trigger_comm trigger_comm = {}; |
3647288f | 265 | struct lttng_trigger_comm *header; |
64eafdf6 JR |
266 | const struct lttng_credentials *creds = NULL; |
267 | ||
268 | creds = lttng_trigger_get_credentials(trigger); | |
269 | assert(creds); | |
270 | ||
271 | trigger_comm.uid = LTTNG_OPTIONAL_GET(creds->uid); | |
a58c490f | 272 | |
242388e4 JR |
273 | if (trigger->name != NULL) { |
274 | size_name = strlen(trigger->name) + 1; | |
275 | } else { | |
276 | size_name = 0; | |
277 | } | |
278 | ||
279 | trigger_comm.name_length = size_name; | |
280 | ||
c0a66c84 JG |
281 | header_offset = payload->buffer.size; |
282 | ret = lttng_dynamic_buffer_append(&payload->buffer, &trigger_comm, | |
3647288f JG |
283 | sizeof(trigger_comm)); |
284 | if (ret) { | |
a58c490f JG |
285 | goto end; |
286 | } | |
287 | ||
c0a66c84 | 288 | size_before_payload = payload->buffer.size; |
242388e4 JR |
289 | |
290 | /* Trigger name. */ | |
291 | ret = lttng_dynamic_buffer_append( | |
292 | &payload->buffer, trigger->name, size_name); | |
293 | if (ret) { | |
294 | goto end; | |
295 | } | |
296 | ||
c0a66c84 | 297 | ret = lttng_condition_serialize(trigger->condition, payload); |
3647288f | 298 | if (ret) { |
a58c490f JG |
299 | goto end; |
300 | } | |
a58c490f | 301 | |
c0a66c84 | 302 | ret = lttng_action_serialize(trigger->action, payload); |
3647288f | 303 | if (ret) { |
a58c490f JG |
304 | goto end; |
305 | } | |
a58c490f | 306 | |
3647288f | 307 | /* Update payload size. */ |
c0a66c84 JG |
308 | header = (typeof(header)) (payload->buffer.data + header_offset); |
309 | header->length = payload->buffer.size - size_before_payload; | |
a58c490f JG |
310 | end: |
311 | return ret; | |
312 | } | |
3da864a9 | 313 | |
85c06c44 JR |
314 | LTTNG_HIDDEN |
315 | bool lttng_trigger_is_equal( | |
316 | const struct lttng_trigger *a, const struct lttng_trigger *b) | |
317 | { | |
318 | /* | |
319 | * Name is not taken into account since it is cosmetic only. | |
320 | */ | |
321 | if (!lttng_condition_is_equal(a->condition, b->condition)) { | |
322 | return false; | |
323 | } | |
324 | ||
325 | if (!lttng_action_is_equal(a->action, b->action)) { | |
326 | return false; | |
327 | } | |
328 | ||
329 | if (!lttng_credentials_is_equal(lttng_trigger_get_credentials(a), | |
330 | lttng_trigger_get_credentials(b))) { | |
331 | return false; | |
332 | } | |
333 | ||
334 | return true; | |
335 | } | |
336 | ||
242388e4 JR |
337 | enum lttng_trigger_status lttng_trigger_set_name(struct lttng_trigger *trigger, |
338 | const char* name) | |
339 | { | |
340 | char *name_copy = NULL; | |
341 | enum lttng_trigger_status status = LTTNG_TRIGGER_STATUS_OK; | |
342 | ||
343 | if (!trigger || !name || | |
344 | strlen(name) == 0) { | |
345 | status = LTTNG_TRIGGER_STATUS_INVALID; | |
346 | goto end; | |
347 | } | |
348 | ||
349 | name_copy = strdup(name); | |
350 | if (!name_copy) { | |
351 | status = LTTNG_TRIGGER_STATUS_ERROR; | |
352 | goto end; | |
353 | } | |
354 | ||
355 | free(trigger->name); | |
356 | ||
357 | trigger->name = name_copy; | |
358 | name_copy = NULL; | |
359 | end: | |
360 | return status; | |
361 | } | |
362 | ||
363 | enum lttng_trigger_status lttng_trigger_get_name( | |
364 | const struct lttng_trigger *trigger, const char **name) | |
365 | { | |
366 | enum lttng_trigger_status status = LTTNG_TRIGGER_STATUS_OK; | |
367 | ||
368 | if (!trigger || !name) { | |
369 | status = LTTNG_TRIGGER_STATUS_INVALID; | |
370 | goto end; | |
371 | } | |
372 | ||
373 | if (!trigger->name) { | |
374 | status = LTTNG_TRIGGER_STATUS_UNSET; | |
375 | } | |
376 | ||
377 | *name = trigger->name; | |
378 | end: | |
379 | return status; | |
380 | } | |
381 | ||
382 | LTTNG_HIDDEN | |
383 | int lttng_trigger_assign_name(struct lttng_trigger *dst, | |
384 | const struct lttng_trigger *src) | |
385 | { | |
386 | int ret = 0; | |
387 | enum lttng_trigger_status status; | |
388 | ||
389 | status = lttng_trigger_set_name(dst, src->name); | |
390 | if (status != LTTNG_TRIGGER_STATUS_OK) { | |
391 | ret = -1; | |
392 | ERR("Failed to set name for trigger"); | |
393 | goto end; | |
394 | } | |
395 | end: | |
396 | return ret; | |
397 | } | |
398 | ||
e6887944 JR |
399 | LTTNG_HIDDEN |
400 | void lttng_trigger_set_tracer_token(struct lttng_trigger *trigger, | |
401 | uint64_t token) | |
402 | { | |
403 | assert(trigger); | |
404 | LTTNG_OPTIONAL_SET(&trigger->tracer_token, token); | |
405 | } | |
406 | ||
407 | LTTNG_HIDDEN | |
408 | uint64_t lttng_trigger_get_tracer_token(const struct lttng_trigger *trigger) | |
409 | { | |
410 | assert(trigger); | |
411 | ||
412 | return LTTNG_OPTIONAL_GET(trigger->tracer_token); | |
413 | } | |
414 | ||
242388e4 JR |
415 | LTTNG_HIDDEN |
416 | int lttng_trigger_generate_name(struct lttng_trigger *trigger, | |
417 | uint64_t unique_id) | |
418 | { | |
419 | int ret = 0; | |
420 | char *generated_name = NULL; | |
421 | ||
422 | ret = asprintf(&generated_name, "T%" PRIu64 "", unique_id); | |
423 | if (ret < 0) { | |
424 | ERR("Failed to generate trigger name"); | |
425 | ret = -1; | |
426 | goto end; | |
427 | } | |
428 | ||
429 | ret = 0; | |
430 | free(trigger->name); | |
431 | trigger->name = generated_name; | |
432 | end: | |
433 | return ret; | |
434 | } | |
435 | ||
f01d28b4 JR |
436 | LTTNG_HIDDEN |
437 | void lttng_trigger_get(struct lttng_trigger *trigger) | |
438 | { | |
439 | urcu_ref_get(&trigger->ref); | |
440 | } | |
441 | ||
442 | LTTNG_HIDDEN | |
443 | void lttng_trigger_put(struct lttng_trigger *trigger) | |
444 | { | |
445 | if (!trigger) { | |
446 | return; | |
447 | } | |
448 | ||
449 | urcu_ref_put(&trigger->ref , trigger_destroy_ref); | |
450 | } | |
451 | ||
a02903c0 JR |
452 | static void delete_trigger_array_element(void *ptr) |
453 | { | |
454 | struct lttng_trigger *trigger = ptr; | |
455 | ||
456 | lttng_trigger_put(trigger); | |
457 | } | |
458 | ||
459 | LTTNG_HIDDEN | |
460 | struct lttng_triggers *lttng_triggers_create(void) | |
461 | { | |
462 | struct lttng_triggers *triggers = NULL; | |
463 | ||
464 | triggers = zmalloc(sizeof(*triggers)); | |
465 | if (!triggers) { | |
466 | goto end; | |
467 | } | |
468 | ||
469 | lttng_dynamic_pointer_array_init(&triggers->array, delete_trigger_array_element); | |
470 | ||
471 | end: | |
472 | return triggers; | |
473 | } | |
474 | ||
475 | LTTNG_HIDDEN | |
476 | struct lttng_trigger *lttng_triggers_borrow_mutable_at_index( | |
477 | const struct lttng_triggers *triggers, unsigned int index) | |
478 | { | |
479 | struct lttng_trigger *trigger = NULL; | |
480 | ||
481 | assert(triggers); | |
482 | if (index >= lttng_dynamic_pointer_array_get_count(&triggers->array)) { | |
483 | goto end; | |
484 | } | |
485 | ||
486 | trigger = (struct lttng_trigger *) | |
487 | lttng_dynamic_pointer_array_get_pointer( | |
488 | &triggers->array, index); | |
489 | end: | |
490 | return trigger; | |
491 | } | |
492 | ||
493 | LTTNG_HIDDEN | |
494 | int lttng_triggers_add( | |
495 | struct lttng_triggers *triggers, struct lttng_trigger *trigger) | |
496 | { | |
497 | int ret; | |
498 | ||
499 | assert(triggers); | |
500 | assert(trigger); | |
501 | ||
502 | lttng_trigger_get(trigger); | |
503 | ||
504 | ret = lttng_dynamic_pointer_array_add_pointer(&triggers->array, trigger); | |
505 | if (ret) { | |
506 | lttng_trigger_put(trigger); | |
507 | } | |
508 | ||
509 | return ret; | |
510 | } | |
511 | ||
512 | const struct lttng_trigger *lttng_triggers_get_at_index( | |
513 | const struct lttng_triggers *triggers, unsigned int index) | |
514 | { | |
515 | return lttng_triggers_borrow_mutable_at_index(triggers, index); | |
516 | } | |
517 | ||
518 | enum lttng_trigger_status lttng_triggers_get_count(const struct lttng_triggers *triggers, unsigned int *count) | |
519 | { | |
520 | enum lttng_trigger_status status = LTTNG_TRIGGER_STATUS_OK; | |
521 | ||
522 | if (!triggers || !count) { | |
523 | status = LTTNG_TRIGGER_STATUS_INVALID; | |
524 | goto end; | |
525 | } | |
526 | ||
527 | *count = lttng_dynamic_pointer_array_get_count(&triggers->array); | |
528 | end: | |
529 | return status; | |
530 | } | |
531 | ||
532 | void lttng_triggers_destroy(struct lttng_triggers *triggers) | |
533 | { | |
534 | if (!triggers) { | |
535 | return; | |
536 | } | |
537 | ||
538 | lttng_dynamic_pointer_array_reset(&triggers->array); | |
539 | free(triggers); | |
540 | } | |
541 | ||
542 | int lttng_triggers_serialize(const struct lttng_triggers *triggers, | |
543 | struct lttng_payload *payload) | |
544 | { | |
545 | int ret; | |
546 | unsigned int i, count; | |
547 | size_t size_before_payload; | |
548 | struct lttng_triggers_comm triggers_comm = {}; | |
549 | struct lttng_triggers_comm *header; | |
550 | enum lttng_trigger_status status; | |
551 | const size_t header_offset = payload->buffer.size; | |
552 | ||
553 | status = lttng_triggers_get_count(triggers, &count); | |
554 | if (status != LTTNG_TRIGGER_STATUS_OK) { | |
555 | ret = LTTNG_ERR_INVALID; | |
556 | goto end; | |
557 | } | |
558 | ||
559 | triggers_comm.count = count; | |
560 | ||
561 | /* Placeholder header; updated at the end. */ | |
562 | ret = lttng_dynamic_buffer_append(&payload->buffer, &triggers_comm, | |
563 | sizeof(triggers_comm)); | |
564 | if (ret) { | |
565 | goto end; | |
566 | } | |
567 | ||
568 | size_before_payload = payload->buffer.size; | |
569 | ||
570 | for (i = 0; i < count; i++) { | |
571 | const struct lttng_trigger *trigger = | |
572 | lttng_triggers_get_at_index(triggers, i); | |
573 | ||
574 | assert(trigger); | |
575 | ||
576 | ret = lttng_trigger_serialize(trigger, payload); | |
577 | if (ret) { | |
578 | goto end; | |
579 | } | |
580 | } | |
581 | ||
582 | /* Update payload size. */ | |
583 | header = (struct lttng_triggers_comm *) ((char *) payload->buffer.data + header_offset); | |
584 | header->length = payload->buffer.size - size_before_payload; | |
585 | end: | |
586 | return ret; | |
587 | } | |
588 | ||
589 | LTTNG_HIDDEN | |
590 | ssize_t lttng_triggers_create_from_payload( | |
591 | struct lttng_payload_view *src_view, | |
592 | struct lttng_triggers **triggers) | |
593 | { | |
594 | ssize_t ret, offset = 0, triggers_size = 0; | |
595 | unsigned int i; | |
596 | const struct lttng_triggers_comm *triggers_comm; | |
597 | struct lttng_triggers *local_triggers = NULL; | |
598 | ||
599 | if (!src_view || !triggers) { | |
600 | ret = -1; | |
601 | goto error; | |
602 | } | |
603 | ||
604 | /* lttng_trigger_comms header */ | |
605 | triggers_comm = (const struct lttng_triggers_comm *) src_view->buffer.data; | |
606 | offset += sizeof(*triggers_comm); | |
607 | ||
608 | local_triggers = lttng_triggers_create(); | |
609 | if (!local_triggers) { | |
610 | ret = -1; | |
611 | goto error; | |
612 | } | |
613 | ||
614 | for (i = 0; i < triggers_comm->count; i++) { | |
615 | struct lttng_trigger *trigger = NULL; | |
616 | struct lttng_payload_view trigger_view = | |
617 | lttng_payload_view_from_view(src_view, offset, -1); | |
618 | ssize_t trigger_size; | |
619 | ||
620 | trigger_size = lttng_trigger_create_from_payload( | |
621 | &trigger_view, &trigger); | |
622 | if (trigger_size < 0) { | |
623 | ret = trigger_size; | |
624 | goto error; | |
625 | } | |
626 | ||
627 | /* Transfer ownership of the trigger to the collection. */ | |
628 | ret = lttng_triggers_add(local_triggers, trigger); | |
629 | lttng_trigger_put(trigger); | |
630 | if (ret < 0) { | |
631 | ret = -1; | |
632 | goto error; | |
633 | } | |
634 | ||
635 | offset += trigger_size; | |
636 | triggers_size += trigger_size; | |
637 | } | |
638 | ||
639 | /* Unexpected size of inner-elements; the buffer is corrupted. */ | |
640 | if ((ssize_t) triggers_comm->length != triggers_size) { | |
641 | ret = -1; | |
642 | goto error; | |
643 | } | |
644 | ||
645 | /* Pass ownership to caller. */ | |
646 | *triggers = local_triggers; | |
647 | local_triggers = NULL; | |
648 | ||
649 | ret = offset; | |
650 | error: | |
651 | ||
652 | lttng_triggers_destroy(local_triggers); | |
653 | return ret; | |
654 | } | |
655 | ||
3da864a9 JR |
656 | LTTNG_HIDDEN |
657 | const struct lttng_credentials *lttng_trigger_get_credentials( | |
658 | const struct lttng_trigger *trigger) | |
659 | { | |
64eafdf6 | 660 | return &trigger->creds; |
3da864a9 JR |
661 | } |
662 | ||
663 | LTTNG_HIDDEN | |
64eafdf6 | 664 | void lttng_trigger_set_credentials(struct lttng_trigger *trigger, |
3da864a9 JR |
665 | const struct lttng_credentials *creds) |
666 | { | |
667 | assert(creds); | |
64eafdf6 JR |
668 | trigger->creds = *creds; |
669 | } | |
670 | ||
671 | enum lttng_trigger_status lttng_trigger_set_owner_uid( | |
672 | struct lttng_trigger *trigger, uid_t uid) | |
673 | { | |
674 | enum lttng_trigger_status ret = LTTNG_TRIGGER_STATUS_OK; | |
675 | const struct lttng_credentials creds = { | |
676 | .uid = LTTNG_OPTIONAL_INIT_VALUE(uid), | |
677 | .gid = LTTNG_OPTIONAL_INIT_UNSET, | |
678 | }; | |
679 | ||
680 | if (!trigger) { | |
681 | ret = LTTNG_TRIGGER_STATUS_INVALID; | |
682 | goto end; | |
683 | } | |
684 | ||
685 | /* Client-side validation only to report a clearer error. */ | |
686 | if (geteuid() != 0) { | |
687 | ret = LTTNG_TRIGGER_STATUS_PERMISSION_DENIED; | |
688 | goto end; | |
689 | } | |
690 | ||
691 | lttng_trigger_set_credentials(trigger, &creds); | |
692 | ||
693 | end: | |
694 | return ret; | |
695 | } | |
696 | ||
697 | enum lttng_trigger_status lttng_trigger_get_owner_uid( | |
698 | const struct lttng_trigger *trigger, uid_t *uid) | |
699 | { | |
700 | enum lttng_trigger_status ret = LTTNG_TRIGGER_STATUS_OK; | |
701 | const struct lttng_credentials *creds = NULL; | |
702 | ||
703 | if (!trigger || !uid ) { | |
704 | ret = LTTNG_TRIGGER_STATUS_INVALID; | |
705 | goto end; | |
706 | } | |
707 | ||
708 | if (!trigger->creds.uid.is_set ) { | |
709 | ret = LTTNG_TRIGGER_STATUS_UNSET; | |
710 | goto end; | |
711 | } | |
712 | ||
713 | creds = lttng_trigger_get_credentials(trigger); | |
714 | *uid = lttng_credentials_get_uid(creds); | |
715 | ||
716 | end: | |
717 | return ret; | |
3da864a9 | 718 | } |