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, | |
6808ef55 | 132 | struct lttng_trigger **_trigger) |
a58c490f | 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 | }; | |
6808ef55 | 143 | struct lttng_trigger *trigger = NULL; |
3e6e0df2 JG |
144 | const struct lttng_payload_view trigger_comm_view = |
145 | lttng_payload_view_from_view( | |
146 | src_view, 0, sizeof(*trigger_comm)); | |
a58c490f | 147 | |
6808ef55 | 148 | if (!src_view || !_trigger) { |
a58c490f JG |
149 | ret = -1; |
150 | goto end; | |
151 | } | |
152 | ||
3e6e0df2 JG |
153 | if (!lttng_payload_view_is_valid(&trigger_comm_view)) { |
154 | /* Payload not large enough to contain the header. */ | |
155 | ret = -1; | |
156 | goto end; | |
157 | } | |
158 | ||
a58c490f | 159 | /* lttng_trigger_comm header */ |
3e6e0df2 | 160 | trigger_comm = (typeof(trigger_comm)) trigger_comm_view.buffer.data; |
64eafdf6 JR |
161 | |
162 | /* Set the trigger's creds. */ | |
163 | if (trigger_comm->uid > (uint64_t) ((uid_t) -1)) { | |
164 | /* UID out of range for this platform. */ | |
165 | ret = -1; | |
166 | goto end; | |
167 | } | |
168 | ||
169 | LTTNG_OPTIONAL_SET(&creds.uid, trigger_comm->uid); | |
170 | ||
a58c490f | 171 | offset += sizeof(*trigger_comm); |
242388e4 JR |
172 | |
173 | if (trigger_comm->name_length != 0) { | |
174 | /* Name. */ | |
175 | const struct lttng_payload_view name_view = | |
176 | lttng_payload_view_from_view( | |
3e6e0df2 JG |
177 | src_view, offset, |
178 | trigger_comm->name_length); | |
179 | ||
180 | if (!lttng_payload_view_is_valid(&name_view)) { | |
181 | ret = -1; | |
182 | goto end; | |
183 | } | |
242388e4 JR |
184 | |
185 | name = name_view.buffer.data; | |
186 | if (!lttng_buffer_view_contains_string(&name_view.buffer, name, | |
187 | trigger_comm->name_length)) { | |
188 | ret = -1; | |
189 | goto end; | |
190 | } | |
191 | ||
192 | offset += trigger_comm->name_length; | |
193 | name_size = trigger_comm->name_length; | |
194 | } | |
195 | ||
c0a66c84 JG |
196 | { |
197 | /* struct lttng_condition */ | |
198 | struct lttng_payload_view condition_view = | |
199 | lttng_payload_view_from_view( | |
200 | src_view, offset, -1); | |
201 | ||
202 | condition_size = lttng_condition_create_from_payload(&condition_view, | |
203 | &condition); | |
204 | } | |
a58c490f | 205 | |
a58c490f JG |
206 | if (condition_size < 0) { |
207 | ret = condition_size; | |
208 | goto end; | |
209 | } | |
c0a66c84 | 210 | |
a58c490f | 211 | offset += condition_size; |
c0a66c84 JG |
212 | { |
213 | /* struct lttng_action */ | |
214 | struct lttng_payload_view action_view = | |
215 | lttng_payload_view_from_view( | |
216 | src_view, offset, -1); | |
217 | ||
218 | action_size = lttng_action_create_from_payload(&action_view, &action); | |
219 | } | |
a58c490f | 220 | |
a58c490f JG |
221 | if (action_size < 0) { |
222 | ret = action_size; | |
223 | goto end; | |
224 | } | |
225 | offset += action_size; | |
226 | ||
227 | /* Unexpected size of inner-elements; the buffer is corrupted. */ | |
242388e4 | 228 | if ((ssize_t) trigger_comm->length != condition_size + action_size + name_size) { |
a58c490f JG |
229 | ret = -1; |
230 | goto error; | |
231 | } | |
232 | ||
6808ef55 JG |
233 | trigger = lttng_trigger_create(condition, action); |
234 | if (!trigger) { | |
a58c490f JG |
235 | ret = -1; |
236 | goto error; | |
237 | } | |
c0a66c84 | 238 | |
6808ef55 | 239 | lttng_trigger_set_credentials(trigger, &creds); |
64eafdf6 | 240 | |
7ca172c1 JR |
241 | /* |
242 | * The trigger object owns references to the action and condition | |
243 | * objects. | |
244 | */ | |
245 | lttng_condition_put(condition); | |
246 | condition = NULL; | |
247 | ||
248 | lttng_action_put(action); | |
249 | action = NULL; | |
250 | ||
242388e4 JR |
251 | if (name) { |
252 | const enum lttng_trigger_status status = | |
6808ef55 | 253 | lttng_trigger_set_name(trigger, name); |
242388e4 JR |
254 | |
255 | if (status != LTTNG_TRIGGER_STATUS_OK) { | |
256 | ret = -1; | |
257 | goto end; | |
258 | } | |
259 | } | |
260 | ||
a58c490f | 261 | ret = offset; |
7ca172c1 | 262 | |
a58c490f | 263 | error: |
1065801b JG |
264 | lttng_condition_put(condition); |
265 | lttng_action_put(action); | |
7ca172c1 | 266 | end: |
6808ef55 JG |
267 | if (ret == 0) { |
268 | *_trigger = trigger; | |
269 | } else { | |
270 | lttng_trigger_put(trigger); | |
271 | } | |
272 | ||
a58c490f JG |
273 | return ret; |
274 | } | |
275 | ||
276 | /* | |
a58c490f JG |
277 | * Both elements are stored contiguously, see their "*_comm" structure |
278 | * for the detailed format. | |
279 | */ | |
280 | LTTNG_HIDDEN | |
a02903c0 | 281 | int lttng_trigger_serialize(const struct lttng_trigger *trigger, |
c0a66c84 | 282 | struct lttng_payload *payload) |
a58c490f | 283 | { |
3647288f | 284 | int ret; |
242388e4 | 285 | size_t header_offset, size_before_payload, size_name; |
c0a66c84 | 286 | struct lttng_trigger_comm trigger_comm = {}; |
3647288f | 287 | struct lttng_trigger_comm *header; |
64eafdf6 JR |
288 | const struct lttng_credentials *creds = NULL; |
289 | ||
290 | creds = lttng_trigger_get_credentials(trigger); | |
291 | assert(creds); | |
292 | ||
293 | trigger_comm.uid = LTTNG_OPTIONAL_GET(creds->uid); | |
a58c490f | 294 | |
242388e4 JR |
295 | if (trigger->name != NULL) { |
296 | size_name = strlen(trigger->name) + 1; | |
297 | } else { | |
298 | size_name = 0; | |
299 | } | |
300 | ||
301 | trigger_comm.name_length = size_name; | |
302 | ||
c0a66c84 JG |
303 | header_offset = payload->buffer.size; |
304 | ret = lttng_dynamic_buffer_append(&payload->buffer, &trigger_comm, | |
3647288f JG |
305 | sizeof(trigger_comm)); |
306 | if (ret) { | |
a58c490f JG |
307 | goto end; |
308 | } | |
309 | ||
c0a66c84 | 310 | size_before_payload = payload->buffer.size; |
242388e4 JR |
311 | |
312 | /* Trigger name. */ | |
313 | ret = lttng_dynamic_buffer_append( | |
314 | &payload->buffer, trigger->name, size_name); | |
315 | if (ret) { | |
316 | goto end; | |
317 | } | |
318 | ||
c0a66c84 | 319 | ret = lttng_condition_serialize(trigger->condition, payload); |
3647288f | 320 | if (ret) { |
a58c490f JG |
321 | goto end; |
322 | } | |
a58c490f | 323 | |
c0a66c84 | 324 | ret = lttng_action_serialize(trigger->action, payload); |
3647288f | 325 | if (ret) { |
a58c490f JG |
326 | goto end; |
327 | } | |
a58c490f | 328 | |
3647288f | 329 | /* Update payload size. */ |
c0a66c84 JG |
330 | header = (typeof(header)) (payload->buffer.data + header_offset); |
331 | header->length = payload->buffer.size - size_before_payload; | |
a58c490f JG |
332 | end: |
333 | return ret; | |
334 | } | |
3da864a9 | 335 | |
85c06c44 JR |
336 | LTTNG_HIDDEN |
337 | bool lttng_trigger_is_equal( | |
338 | const struct lttng_trigger *a, const struct lttng_trigger *b) | |
339 | { | |
340 | /* | |
341 | * Name is not taken into account since it is cosmetic only. | |
342 | */ | |
343 | if (!lttng_condition_is_equal(a->condition, b->condition)) { | |
344 | return false; | |
345 | } | |
346 | ||
347 | if (!lttng_action_is_equal(a->action, b->action)) { | |
348 | return false; | |
349 | } | |
350 | ||
351 | if (!lttng_credentials_is_equal(lttng_trigger_get_credentials(a), | |
352 | lttng_trigger_get_credentials(b))) { | |
353 | return false; | |
354 | } | |
355 | ||
356 | return true; | |
357 | } | |
358 | ||
242388e4 JR |
359 | enum lttng_trigger_status lttng_trigger_set_name(struct lttng_trigger *trigger, |
360 | const char* name) | |
361 | { | |
362 | char *name_copy = NULL; | |
363 | enum lttng_trigger_status status = LTTNG_TRIGGER_STATUS_OK; | |
364 | ||
365 | if (!trigger || !name || | |
366 | strlen(name) == 0) { | |
367 | status = LTTNG_TRIGGER_STATUS_INVALID; | |
368 | goto end; | |
369 | } | |
370 | ||
371 | name_copy = strdup(name); | |
372 | if (!name_copy) { | |
373 | status = LTTNG_TRIGGER_STATUS_ERROR; | |
374 | goto end; | |
375 | } | |
376 | ||
377 | free(trigger->name); | |
378 | ||
379 | trigger->name = name_copy; | |
380 | name_copy = NULL; | |
381 | end: | |
382 | return status; | |
383 | } | |
384 | ||
385 | enum lttng_trigger_status lttng_trigger_get_name( | |
386 | const struct lttng_trigger *trigger, const char **name) | |
387 | { | |
388 | enum lttng_trigger_status status = LTTNG_TRIGGER_STATUS_OK; | |
389 | ||
390 | if (!trigger || !name) { | |
391 | status = LTTNG_TRIGGER_STATUS_INVALID; | |
392 | goto end; | |
393 | } | |
394 | ||
395 | if (!trigger->name) { | |
396 | status = LTTNG_TRIGGER_STATUS_UNSET; | |
397 | } | |
398 | ||
399 | *name = trigger->name; | |
400 | end: | |
401 | return status; | |
402 | } | |
403 | ||
404 | LTTNG_HIDDEN | |
405 | int lttng_trigger_assign_name(struct lttng_trigger *dst, | |
406 | const struct lttng_trigger *src) | |
407 | { | |
408 | int ret = 0; | |
409 | enum lttng_trigger_status status; | |
410 | ||
411 | status = lttng_trigger_set_name(dst, src->name); | |
412 | if (status != LTTNG_TRIGGER_STATUS_OK) { | |
413 | ret = -1; | |
414 | ERR("Failed to set name for trigger"); | |
415 | goto end; | |
416 | } | |
417 | end: | |
418 | return ret; | |
419 | } | |
420 | ||
e6887944 JR |
421 | LTTNG_HIDDEN |
422 | void lttng_trigger_set_tracer_token(struct lttng_trigger *trigger, | |
423 | uint64_t token) | |
424 | { | |
425 | assert(trigger); | |
426 | LTTNG_OPTIONAL_SET(&trigger->tracer_token, token); | |
427 | } | |
428 | ||
429 | LTTNG_HIDDEN | |
430 | uint64_t lttng_trigger_get_tracer_token(const struct lttng_trigger *trigger) | |
431 | { | |
432 | assert(trigger); | |
433 | ||
434 | return LTTNG_OPTIONAL_GET(trigger->tracer_token); | |
435 | } | |
436 | ||
242388e4 JR |
437 | LTTNG_HIDDEN |
438 | int lttng_trigger_generate_name(struct lttng_trigger *trigger, | |
439 | uint64_t unique_id) | |
440 | { | |
441 | int ret = 0; | |
442 | char *generated_name = NULL; | |
443 | ||
444 | ret = asprintf(&generated_name, "T%" PRIu64 "", unique_id); | |
445 | if (ret < 0) { | |
446 | ERR("Failed to generate trigger name"); | |
447 | ret = -1; | |
448 | goto end; | |
449 | } | |
450 | ||
451 | ret = 0; | |
452 | free(trigger->name); | |
453 | trigger->name = generated_name; | |
454 | end: | |
455 | return ret; | |
456 | } | |
457 | ||
f01d28b4 JR |
458 | LTTNG_HIDDEN |
459 | void lttng_trigger_get(struct lttng_trigger *trigger) | |
460 | { | |
461 | urcu_ref_get(&trigger->ref); | |
462 | } | |
463 | ||
464 | LTTNG_HIDDEN | |
465 | void lttng_trigger_put(struct lttng_trigger *trigger) | |
466 | { | |
467 | if (!trigger) { | |
468 | return; | |
469 | } | |
470 | ||
471 | urcu_ref_put(&trigger->ref , trigger_destroy_ref); | |
472 | } | |
473 | ||
a02903c0 JR |
474 | static void delete_trigger_array_element(void *ptr) |
475 | { | |
476 | struct lttng_trigger *trigger = ptr; | |
477 | ||
478 | lttng_trigger_put(trigger); | |
479 | } | |
480 | ||
481 | LTTNG_HIDDEN | |
482 | struct lttng_triggers *lttng_triggers_create(void) | |
483 | { | |
484 | struct lttng_triggers *triggers = NULL; | |
485 | ||
486 | triggers = zmalloc(sizeof(*triggers)); | |
487 | if (!triggers) { | |
488 | goto end; | |
489 | } | |
490 | ||
491 | lttng_dynamic_pointer_array_init(&triggers->array, delete_trigger_array_element); | |
492 | ||
493 | end: | |
494 | return triggers; | |
495 | } | |
496 | ||
497 | LTTNG_HIDDEN | |
498 | struct lttng_trigger *lttng_triggers_borrow_mutable_at_index( | |
499 | const struct lttng_triggers *triggers, unsigned int index) | |
500 | { | |
501 | struct lttng_trigger *trigger = NULL; | |
502 | ||
503 | assert(triggers); | |
504 | if (index >= lttng_dynamic_pointer_array_get_count(&triggers->array)) { | |
505 | goto end; | |
506 | } | |
507 | ||
508 | trigger = (struct lttng_trigger *) | |
509 | lttng_dynamic_pointer_array_get_pointer( | |
510 | &triggers->array, index); | |
511 | end: | |
512 | return trigger; | |
513 | } | |
514 | ||
515 | LTTNG_HIDDEN | |
516 | int lttng_triggers_add( | |
517 | struct lttng_triggers *triggers, struct lttng_trigger *trigger) | |
518 | { | |
519 | int ret; | |
520 | ||
521 | assert(triggers); | |
522 | assert(trigger); | |
523 | ||
524 | lttng_trigger_get(trigger); | |
525 | ||
526 | ret = lttng_dynamic_pointer_array_add_pointer(&triggers->array, trigger); | |
527 | if (ret) { | |
528 | lttng_trigger_put(trigger); | |
529 | } | |
530 | ||
531 | return ret; | |
532 | } | |
533 | ||
534 | const struct lttng_trigger *lttng_triggers_get_at_index( | |
535 | const struct lttng_triggers *triggers, unsigned int index) | |
536 | { | |
537 | return lttng_triggers_borrow_mutable_at_index(triggers, index); | |
538 | } | |
539 | ||
540 | enum lttng_trigger_status lttng_triggers_get_count(const struct lttng_triggers *triggers, unsigned int *count) | |
541 | { | |
542 | enum lttng_trigger_status status = LTTNG_TRIGGER_STATUS_OK; | |
543 | ||
544 | if (!triggers || !count) { | |
545 | status = LTTNG_TRIGGER_STATUS_INVALID; | |
546 | goto end; | |
547 | } | |
548 | ||
549 | *count = lttng_dynamic_pointer_array_get_count(&triggers->array); | |
550 | end: | |
551 | return status; | |
552 | } | |
553 | ||
554 | void lttng_triggers_destroy(struct lttng_triggers *triggers) | |
555 | { | |
556 | if (!triggers) { | |
557 | return; | |
558 | } | |
559 | ||
560 | lttng_dynamic_pointer_array_reset(&triggers->array); | |
561 | free(triggers); | |
562 | } | |
563 | ||
564 | int lttng_triggers_serialize(const struct lttng_triggers *triggers, | |
565 | struct lttng_payload *payload) | |
566 | { | |
567 | int ret; | |
568 | unsigned int i, count; | |
569 | size_t size_before_payload; | |
570 | struct lttng_triggers_comm triggers_comm = {}; | |
571 | struct lttng_triggers_comm *header; | |
572 | enum lttng_trigger_status status; | |
573 | const size_t header_offset = payload->buffer.size; | |
574 | ||
575 | status = lttng_triggers_get_count(triggers, &count); | |
576 | if (status != LTTNG_TRIGGER_STATUS_OK) { | |
577 | ret = LTTNG_ERR_INVALID; | |
578 | goto end; | |
579 | } | |
580 | ||
581 | triggers_comm.count = count; | |
582 | ||
583 | /* Placeholder header; updated at the end. */ | |
584 | ret = lttng_dynamic_buffer_append(&payload->buffer, &triggers_comm, | |
585 | sizeof(triggers_comm)); | |
586 | if (ret) { | |
587 | goto end; | |
588 | } | |
589 | ||
590 | size_before_payload = payload->buffer.size; | |
591 | ||
592 | for (i = 0; i < count; i++) { | |
593 | const struct lttng_trigger *trigger = | |
594 | lttng_triggers_get_at_index(triggers, i); | |
595 | ||
596 | assert(trigger); | |
597 | ||
598 | ret = lttng_trigger_serialize(trigger, payload); | |
599 | if (ret) { | |
600 | goto end; | |
601 | } | |
602 | } | |
603 | ||
604 | /* Update payload size. */ | |
605 | header = (struct lttng_triggers_comm *) ((char *) payload->buffer.data + header_offset); | |
606 | header->length = payload->buffer.size - size_before_payload; | |
607 | end: | |
608 | return ret; | |
609 | } | |
610 | ||
611 | LTTNG_HIDDEN | |
612 | ssize_t lttng_triggers_create_from_payload( | |
613 | struct lttng_payload_view *src_view, | |
614 | struct lttng_triggers **triggers) | |
615 | { | |
616 | ssize_t ret, offset = 0, triggers_size = 0; | |
617 | unsigned int i; | |
618 | const struct lttng_triggers_comm *triggers_comm; | |
619 | struct lttng_triggers *local_triggers = NULL; | |
620 | ||
621 | if (!src_view || !triggers) { | |
622 | ret = -1; | |
623 | goto error; | |
624 | } | |
625 | ||
626 | /* lttng_trigger_comms header */ | |
627 | triggers_comm = (const struct lttng_triggers_comm *) src_view->buffer.data; | |
628 | offset += sizeof(*triggers_comm); | |
629 | ||
630 | local_triggers = lttng_triggers_create(); | |
631 | if (!local_triggers) { | |
632 | ret = -1; | |
633 | goto error; | |
634 | } | |
635 | ||
636 | for (i = 0; i < triggers_comm->count; i++) { | |
637 | struct lttng_trigger *trigger = NULL; | |
638 | struct lttng_payload_view trigger_view = | |
639 | lttng_payload_view_from_view(src_view, offset, -1); | |
640 | ssize_t trigger_size; | |
641 | ||
642 | trigger_size = lttng_trigger_create_from_payload( | |
643 | &trigger_view, &trigger); | |
644 | if (trigger_size < 0) { | |
645 | ret = trigger_size; | |
646 | goto error; | |
647 | } | |
648 | ||
649 | /* Transfer ownership of the trigger to the collection. */ | |
650 | ret = lttng_triggers_add(local_triggers, trigger); | |
651 | lttng_trigger_put(trigger); | |
652 | if (ret < 0) { | |
653 | ret = -1; | |
654 | goto error; | |
655 | } | |
656 | ||
657 | offset += trigger_size; | |
658 | triggers_size += trigger_size; | |
659 | } | |
660 | ||
661 | /* Unexpected size of inner-elements; the buffer is corrupted. */ | |
662 | if ((ssize_t) triggers_comm->length != triggers_size) { | |
663 | ret = -1; | |
664 | goto error; | |
665 | } | |
666 | ||
667 | /* Pass ownership to caller. */ | |
668 | *triggers = local_triggers; | |
669 | local_triggers = NULL; | |
670 | ||
671 | ret = offset; | |
672 | error: | |
673 | ||
674 | lttng_triggers_destroy(local_triggers); | |
675 | return ret; | |
676 | } | |
677 | ||
3da864a9 JR |
678 | LTTNG_HIDDEN |
679 | const struct lttng_credentials *lttng_trigger_get_credentials( | |
680 | const struct lttng_trigger *trigger) | |
681 | { | |
64eafdf6 | 682 | return &trigger->creds; |
3da864a9 JR |
683 | } |
684 | ||
685 | LTTNG_HIDDEN | |
64eafdf6 | 686 | void lttng_trigger_set_credentials(struct lttng_trigger *trigger, |
3da864a9 JR |
687 | const struct lttng_credentials *creds) |
688 | { | |
689 | assert(creds); | |
64eafdf6 JR |
690 | trigger->creds = *creds; |
691 | } | |
692 | ||
693 | enum lttng_trigger_status lttng_trigger_set_owner_uid( | |
694 | struct lttng_trigger *trigger, uid_t uid) | |
695 | { | |
696 | enum lttng_trigger_status ret = LTTNG_TRIGGER_STATUS_OK; | |
697 | const struct lttng_credentials creds = { | |
698 | .uid = LTTNG_OPTIONAL_INIT_VALUE(uid), | |
699 | .gid = LTTNG_OPTIONAL_INIT_UNSET, | |
700 | }; | |
701 | ||
702 | if (!trigger) { | |
703 | ret = LTTNG_TRIGGER_STATUS_INVALID; | |
704 | goto end; | |
705 | } | |
706 | ||
707 | /* Client-side validation only to report a clearer error. */ | |
708 | if (geteuid() != 0) { | |
709 | ret = LTTNG_TRIGGER_STATUS_PERMISSION_DENIED; | |
710 | goto end; | |
711 | } | |
712 | ||
713 | lttng_trigger_set_credentials(trigger, &creds); | |
714 | ||
715 | end: | |
716 | return ret; | |
717 | } | |
718 | ||
719 | enum lttng_trigger_status lttng_trigger_get_owner_uid( | |
720 | const struct lttng_trigger *trigger, uid_t *uid) | |
721 | { | |
722 | enum lttng_trigger_status ret = LTTNG_TRIGGER_STATUS_OK; | |
723 | const struct lttng_credentials *creds = NULL; | |
724 | ||
725 | if (!trigger || !uid ) { | |
726 | ret = LTTNG_TRIGGER_STATUS_INVALID; | |
727 | goto end; | |
728 | } | |
729 | ||
730 | if (!trigger->creds.uid.is_set ) { | |
731 | ret = LTTNG_TRIGGER_STATUS_UNSET; | |
732 | goto end; | |
733 | } | |
734 | ||
735 | creds = lttng_trigger_get_credentials(trigger); | |
736 | *uid = lttng_credentials_get_uid(creds); | |
737 | ||
738 | end: | |
739 | return ret; | |
3da864a9 | 740 | } |