Commit | Line | Data |
---|---|---|
76fcf151 | 1 | /* |
ab5be9fa | 2 | * Copyright (C) 2018 Jérémie Galarneau <jeremie.galarneau@efficios.com> |
76fcf151 | 3 | * |
ab5be9fa | 4 | * SPDX-License-Identifier: LGPL-2.1-only |
76fcf151 | 5 | * |
76fcf151 JG |
6 | */ |
7 | ||
fe5e9e65 JR |
8 | #include "common/compat/string.h" |
9 | #include "common/macros.h" | |
10 | #include "lttng/lttng-error.h" | |
11 | #include <assert.h> | |
12 | #include <common/buffer-view.h> | |
13 | #include <common/dynamic-array.h> | |
14 | #include <common/dynamic-buffer.h> | |
76fcf151 | 15 | #include <common/error.h> |
fe5e9e65 JR |
16 | #include <common/sessiond-comm/sessiond-comm.h> |
17 | #include <common/align.h> | |
18 | #include <lttng/constant.h> | |
19 | #include <lttng/event-internal.h> | |
20 | #include <lttng/event.h> | |
21 | #include <lttng/userspace-probe-internal.h> | |
22 | #include <stdint.h> | |
23 | #include <string.h> | |
24 | ||
25 | struct event_list_element { | |
26 | struct lttng_event *event; | |
27 | struct lttng_event_exclusion *exclusions; | |
28 | char *filter_expression; | |
29 | }; | |
30 | ||
31 | static void event_list_destructor(void *ptr) | |
32 | { | |
33 | struct event_list_element *element = (struct event_list_element *) ptr; | |
34 | ||
35 | free(element->filter_expression); | |
36 | free(element->exclusions); | |
37 | lttng_event_destroy(element->event); | |
38 | free(element); | |
39 | } | |
76fcf151 JG |
40 | |
41 | LTTNG_HIDDEN | |
42 | struct lttng_event *lttng_event_copy(const struct lttng_event *event) | |
43 | { | |
44 | struct lttng_event *new_event; | |
45 | struct lttng_event_extended *new_event_extended; | |
46 | ||
47 | new_event = zmalloc(sizeof(*event)); | |
48 | if (!new_event) { | |
49 | PERROR("Error allocating event structure"); | |
50 | goto end; | |
51 | } | |
52 | ||
53 | /* Copy the content of the old event. */ | |
54 | memcpy(new_event, event, sizeof(*event)); | |
55 | ||
56 | /* | |
57 | * We need to create a new extended since the previous pointer is now | |
58 | * invalid. | |
59 | */ | |
60 | new_event_extended = zmalloc(sizeof(*new_event_extended)); | |
61 | if (!new_event_extended) { | |
62 | PERROR("Error allocating event extended structure"); | |
63 | goto error; | |
64 | } | |
65 | ||
66 | new_event->extended.ptr = new_event_extended; | |
67 | end: | |
68 | return new_event; | |
69 | error: | |
70 | free(new_event); | |
37750a61 | 71 | new_event = NULL; |
76fcf151 JG |
72 | goto end; |
73 | } | |
fe5e9e65 JR |
74 | |
75 | static int lttng_event_probe_attr_serialize( | |
76 | const struct lttng_event_probe_attr *probe, | |
77 | struct lttng_payload *payload) | |
78 | { | |
79 | int ret; | |
80 | size_t symbol_name_len; | |
81 | struct lttng_event_probe_attr_comm comm = { 0 }; | |
82 | ||
83 | symbol_name_len = lttng_strnlen(probe->symbol_name, LTTNG_SYMBOL_NAME_LEN); | |
84 | if (symbol_name_len == LTTNG_SYMBOL_NAME_LEN) { | |
85 | /* Not null-termintated. */ | |
86 | ret = -1; | |
87 | goto end; | |
88 | } | |
89 | ||
90 | /* Include the null terminator. */ | |
91 | symbol_name_len += 1; | |
92 | ||
93 | comm.symbol_name_len = (uint32_t) symbol_name_len; | |
94 | comm.addr = probe->addr; | |
95 | comm.offset = probe->addr; | |
96 | ||
97 | ret = lttng_dynamic_buffer_append( | |
98 | &payload->buffer, &comm, sizeof(comm)); | |
99 | if (ret < 0) { | |
100 | ret = -1; | |
101 | goto end; | |
102 | } | |
103 | ||
104 | ret = lttng_dynamic_buffer_append( | |
105 | &payload->buffer, probe->symbol_name, symbol_name_len); | |
106 | end: | |
107 | return ret; | |
108 | } | |
109 | ||
110 | static int lttng_event_function_attr_serialize( | |
111 | const struct lttng_event_function_attr *function, | |
112 | struct lttng_payload *payload) | |
113 | { | |
114 | int ret; | |
115 | size_t symbol_name_len; | |
116 | struct lttng_event_function_attr_comm comm = { 0 }; | |
117 | ||
118 | symbol_name_len = lttng_strnlen(function->symbol_name, LTTNG_SYMBOL_NAME_LEN); | |
119 | if (symbol_name_len == LTTNG_SYMBOL_NAME_LEN) { | |
120 | /* Not null-termintated. */ | |
121 | ret = -1; | |
122 | goto end; | |
123 | } | |
124 | ||
125 | /* Include the null terminator. */ | |
126 | symbol_name_len += 1; | |
127 | ||
128 | comm.symbol_name_len = (uint32_t) symbol_name_len; | |
129 | ||
130 | ret = lttng_dynamic_buffer_append( | |
131 | &payload->buffer, &comm, sizeof(comm)); | |
132 | if (ret < 0) { | |
133 | ret = -1; | |
134 | goto end; | |
135 | } | |
136 | ||
137 | ret = lttng_dynamic_buffer_append(&payload->buffer, | |
138 | function->symbol_name, symbol_name_len); | |
139 | end: | |
140 | return ret; | |
141 | } | |
142 | ||
143 | static ssize_t lttng_event_probe_attr_create_from_payload( | |
144 | struct lttng_payload_view *view, | |
145 | struct lttng_event_probe_attr **probe_attr) | |
146 | { | |
147 | ssize_t ret, offset = 0; | |
148 | const struct lttng_event_probe_attr_comm *comm; | |
149 | struct lttng_event_probe_attr *local_attr = NULL; | |
150 | struct lttng_payload_view comm_view = lttng_payload_view_from_view( | |
151 | view, offset, sizeof(*comm)); | |
152 | ||
153 | if (!lttng_payload_view_is_valid(&comm_view)) { | |
154 | ret = -1; | |
155 | goto end; | |
156 | } | |
157 | ||
158 | comm = (typeof(comm)) comm_view.buffer.data; | |
159 | offset += sizeof(*comm); | |
160 | ||
161 | local_attr = (struct lttng_event_probe_attr *) zmalloc( | |
162 | sizeof(*local_attr)); | |
163 | if (local_attr == NULL) { | |
164 | ret = -1; | |
165 | goto end; | |
166 | } | |
167 | ||
168 | local_attr->addr = comm->addr; | |
169 | local_attr->offset = comm->offset; | |
170 | ||
171 | { | |
172 | const char *name; | |
173 | struct lttng_payload_view name_view = | |
174 | lttng_payload_view_from_view(view, offset, | |
175 | comm->symbol_name_len); | |
176 | ||
177 | if (!lttng_payload_view_is_valid(&name_view)) { | |
178 | ret = -1; | |
179 | goto end; | |
180 | } | |
181 | ||
182 | name = name_view.buffer.data; | |
183 | ||
184 | if (!lttng_buffer_view_contains_string(&name_view.buffer, name, | |
185 | comm->symbol_name_len)) { | |
186 | ret = -1; | |
187 | goto end; | |
188 | } | |
189 | ||
190 | ret = lttng_strncpy(local_attr->symbol_name, name, | |
191 | LTTNG_SYMBOL_NAME_LEN); | |
192 | if (ret) { | |
193 | ret = -1; | |
194 | goto end; | |
195 | } | |
196 | ||
197 | offset += comm->symbol_name_len; | |
198 | } | |
199 | ||
200 | *probe_attr = local_attr; | |
201 | local_attr = NULL; | |
202 | ret = offset; | |
203 | end: | |
1c680610 | 204 | free(local_attr); |
fe5e9e65 JR |
205 | return ret; |
206 | } | |
207 | ||
208 | static ssize_t lttng_event_function_attr_create_from_payload( | |
209 | struct lttng_payload_view *view, | |
210 | struct lttng_event_function_attr **function_attr) | |
211 | { | |
212 | ssize_t ret, offset = 0; | |
213 | const struct lttng_event_function_attr_comm *comm; | |
214 | struct lttng_event_function_attr *local_attr = NULL; | |
215 | struct lttng_payload_view comm_view = lttng_payload_view_from_view( | |
216 | view, offset, sizeof(*comm)); | |
217 | ||
218 | if (!lttng_payload_view_is_valid(&comm_view)) { | |
219 | ret = -1; | |
220 | goto end; | |
221 | } | |
222 | ||
223 | comm = (typeof(comm)) view->buffer.data; | |
224 | offset += sizeof(*comm); | |
225 | ||
226 | local_attr = (struct lttng_event_function_attr *) zmalloc( | |
227 | sizeof(*local_attr)); | |
228 | if (local_attr == NULL) { | |
229 | ret = -1; | |
230 | goto end; | |
231 | } | |
232 | ||
233 | { | |
234 | const char *name; | |
235 | struct lttng_payload_view name_view = | |
236 | lttng_payload_view_from_view(view, offset, | |
237 | comm->symbol_name_len); | |
238 | ||
239 | if (!lttng_payload_view_is_valid(&name_view)) { | |
240 | ret = -1; | |
241 | goto end; | |
242 | } | |
243 | ||
244 | name = name_view.buffer.data; | |
245 | ||
246 | if (!lttng_buffer_view_contains_string(&name_view.buffer, name, | |
247 | comm->symbol_name_len)) { | |
248 | ret = -1; | |
249 | goto end; | |
250 | } | |
251 | ||
252 | ret = lttng_strncpy(local_attr->symbol_name, name, | |
253 | LTTNG_SYMBOL_NAME_LEN); | |
254 | if (ret) { | |
255 | ret = -1; | |
256 | goto end; | |
257 | } | |
258 | ||
259 | offset += comm->symbol_name_len; | |
260 | } | |
261 | ||
262 | *function_attr = local_attr; | |
263 | local_attr = NULL; | |
264 | ret = offset; | |
265 | end: | |
1c680610 | 266 | free(local_attr); |
fe5e9e65 JR |
267 | return ret; |
268 | } | |
269 | ||
270 | static ssize_t lttng_event_exclusions_create_from_payload( | |
271 | struct lttng_payload_view *view, | |
272 | uint32_t count, | |
273 | struct lttng_event_exclusion **exclusions) | |
274 | { | |
275 | ssize_t ret, offset = 0; | |
276 | size_t size = (count * LTTNG_SYMBOL_NAME_LEN); | |
277 | uint32_t i; | |
278 | const struct lttng_event_exclusion_comm *comm; | |
279 | struct lttng_event_exclusion *local_exclusions; | |
280 | ||
281 | local_exclusions = (struct lttng_event_exclusion *) zmalloc( | |
282 | sizeof(struct lttng_event_exclusion) + size); | |
283 | if (!local_exclusions) { | |
284 | ret = -1; | |
285 | goto end; | |
286 | } | |
287 | ||
288 | local_exclusions->count = count; | |
289 | ||
290 | for (i = 0; i < count; i++) { | |
291 | const char *string; | |
292 | struct lttng_buffer_view string_view; | |
293 | const struct lttng_buffer_view comm_view = | |
294 | lttng_buffer_view_from_view(&view->buffer, | |
295 | offset, sizeof(*comm)); | |
296 | ||
297 | if (!lttng_buffer_view_is_valid(&comm_view)) { | |
298 | ret = -1; | |
299 | goto end; | |
300 | } | |
301 | ||
302 | comm = (typeof(comm)) comm_view.data; | |
303 | offset += sizeof(*comm); | |
304 | ||
305 | string_view = lttng_buffer_view_from_view( | |
306 | &view->buffer, offset, comm->len); | |
307 | ||
308 | if (!lttng_buffer_view_is_valid(&string_view)) { | |
309 | ret = -1; | |
310 | goto end; | |
311 | } | |
312 | ||
313 | string = string_view.data; | |
314 | ||
315 | if (!lttng_buffer_view_contains_string( | |
316 | &string_view, string, comm->len)) { | |
317 | ret = -1; | |
318 | goto end; | |
319 | } | |
320 | ||
321 | ret = lttng_strncpy(local_exclusions->names[i], | |
322 | string, LTTNG_SYMBOL_NAME_LEN); | |
323 | if (ret) { | |
324 | ret = -1; | |
325 | goto end; | |
326 | } | |
327 | ||
328 | offset += comm->len; | |
329 | } | |
330 | ||
331 | *exclusions = local_exclusions; | |
332 | local_exclusions = NULL; | |
333 | ret = offset; | |
334 | end: | |
335 | free(local_exclusions); | |
336 | return ret; | |
337 | } | |
338 | ||
339 | ssize_t lttng_event_create_from_payload(struct lttng_payload_view *view, | |
340 | struct lttng_event **out_event, | |
341 | struct lttng_event_exclusion **out_exclusion, | |
342 | char **out_filter_expression, | |
343 | struct lttng_bytecode **out_bytecode) | |
344 | { | |
345 | ssize_t ret, offset = 0; | |
346 | struct lttng_event *local_event = NULL; | |
347 | struct lttng_event_exclusion *local_exclusions = NULL; | |
348 | struct lttng_bytecode *local_bytecode = NULL; | |
349 | char *local_filter_expression = NULL; | |
350 | const struct lttng_event_comm *event_comm; | |
351 | struct lttng_event_function_attr *local_function_attr = NULL; | |
352 | struct lttng_event_probe_attr *local_probe_attr = NULL; | |
353 | struct lttng_userspace_probe_location *local_userspace_probe_location = | |
354 | NULL; | |
355 | ||
356 | /* | |
357 | * Only event is obligatory, the other output argument are optional and | |
358 | * depends on what the caller is interested in. | |
359 | */ | |
360 | assert(out_event); | |
361 | assert(view); | |
362 | ||
363 | { | |
364 | struct lttng_payload_view comm_view = | |
365 | lttng_payload_view_from_view(view, offset, | |
366 | sizeof(*event_comm)); | |
367 | ||
368 | if (!lttng_payload_view_is_valid(&comm_view)) { | |
369 | ret = -1; | |
370 | goto end; | |
371 | } | |
372 | ||
373 | /* lttng_event_comm header */ | |
374 | event_comm = (typeof(event_comm)) comm_view.buffer.data; | |
375 | offset += sizeof(*event_comm); | |
376 | } | |
377 | ||
378 | local_event = lttng_event_create(); | |
379 | if (local_event == NULL) { | |
380 | ret = -1; | |
381 | goto end; | |
382 | } | |
383 | ||
384 | local_event->type = (enum lttng_event_type) event_comm->event_type; | |
385 | local_event->loglevel_type = (enum lttng_loglevel_type) event_comm->loglevel_type; | |
386 | local_event->loglevel = event_comm->loglevel; | |
387 | local_event->enabled = event_comm->enabled; | |
388 | local_event->pid = event_comm->pid; | |
389 | local_event->flags = (enum lttng_event_flag) event_comm->flags; | |
390 | ||
391 | { | |
392 | const char *name; | |
393 | const struct lttng_buffer_view name_view = | |
394 | lttng_buffer_view_from_view(&view->buffer, | |
395 | offset, event_comm->name_len); | |
396 | ||
397 | if (!lttng_buffer_view_is_valid(&name_view)) { | |
398 | ret = -1; | |
399 | goto end; | |
400 | } | |
401 | ||
402 | name = (const char *) name_view.data; | |
403 | ||
404 | if (!lttng_buffer_view_contains_string( | |
405 | &name_view, name, event_comm->name_len)) { | |
406 | ret = -1; | |
407 | goto end; | |
408 | } | |
409 | ||
410 | ret = lttng_strncpy( | |
411 | local_event->name, name, LTTNG_SYMBOL_NAME_LEN); | |
412 | if (ret) { | |
413 | ret = -1; | |
414 | goto end; | |
415 | } | |
416 | ||
417 | offset += event_comm->name_len; | |
418 | } | |
419 | ||
420 | /* Exclusions */ | |
421 | if (event_comm->exclusion_count == 0) { | |
422 | goto deserialize_filter_expression; | |
423 | } | |
424 | ||
425 | { | |
426 | struct lttng_payload_view exclusions_view = | |
427 | lttng_payload_view_from_view( | |
428 | view, offset, -1); | |
429 | ||
430 | if (!lttng_payload_view_is_valid(&exclusions_view)) { | |
431 | ret = -1; | |
432 | goto end; | |
433 | } | |
434 | ||
435 | ret = lttng_event_exclusions_create_from_payload(&exclusions_view, | |
436 | event_comm->exclusion_count, &local_exclusions); | |
437 | if (ret < 0) { | |
438 | ret = -1; | |
439 | goto end; | |
440 | } | |
441 | offset += ret; | |
442 | ||
443 | local_event->exclusion = 1; | |
444 | } | |
445 | ||
446 | deserialize_filter_expression: | |
447 | ||
448 | if (event_comm->filter_expression_len == 0) { | |
449 | if (event_comm->bytecode_len != 0) { | |
450 | /* | |
451 | * This is an invalid event payload. | |
452 | * | |
453 | * Filter expression without bytecode is possible but | |
454 | * not the other way around. | |
455 | * */ | |
456 | ret = -1; | |
457 | goto end; | |
458 | } | |
459 | goto deserialize_event_type_payload; | |
460 | } | |
461 | ||
462 | { | |
463 | const char *filter_expression_buffer; | |
464 | struct lttng_buffer_view filter_expression_view = | |
465 | lttng_buffer_view_from_view(&view->buffer, offset, | |
466 | event_comm->filter_expression_len); | |
467 | ||
468 | if (!lttng_buffer_view_is_valid(&filter_expression_view)) { | |
469 | ret = -1; | |
470 | goto end; | |
471 | } | |
472 | ||
473 | filter_expression_buffer = filter_expression_view.data; | |
474 | ||
475 | if (!lttng_buffer_view_contains_string(&filter_expression_view, | |
476 | filter_expression_buffer, | |
477 | event_comm->filter_expression_len)) { | |
478 | ret = -1; | |
479 | goto end; | |
480 | } | |
481 | ||
482 | local_filter_expression = lttng_strndup( | |
483 | filter_expression_buffer, | |
484 | event_comm->filter_expression_len); | |
485 | if (!local_filter_expression) { | |
486 | ret = -1; | |
487 | goto end; | |
488 | } | |
489 | ||
490 | local_event->filter = 1; | |
491 | ||
492 | offset += event_comm->filter_expression_len; | |
493 | } | |
494 | ||
495 | if (event_comm->bytecode_len == 0) { | |
496 | /* | |
497 | * Filter expression can be present but without bytecode | |
498 | * when dealing with event listing. | |
499 | */ | |
500 | goto deserialize_event_type_payload; | |
501 | } | |
502 | ||
503 | /* Bytecode */ | |
504 | { | |
505 | struct lttng_payload_view bytecode_view = | |
506 | lttng_payload_view_from_view(view, offset, | |
507 | event_comm->bytecode_len); | |
508 | ||
509 | if (!lttng_payload_view_is_valid(&bytecode_view)) { | |
510 | ret = -1; | |
511 | goto end; | |
512 | } | |
513 | ||
514 | local_bytecode = (struct lttng_bytecode *) zmalloc( | |
515 | event_comm->bytecode_len); | |
516 | if (!local_bytecode) { | |
517 | ret = -1; | |
518 | goto end; | |
519 | } | |
520 | ||
521 | memcpy(local_bytecode, bytecode_view.buffer.data, | |
522 | event_comm->bytecode_len); | |
523 | if ((local_bytecode->len + sizeof(*local_bytecode)) != | |
524 | event_comm->bytecode_len) { | |
525 | ret = -1; | |
526 | goto end; | |
527 | } | |
528 | ||
529 | offset += event_comm->bytecode_len; | |
530 | } | |
531 | ||
532 | deserialize_event_type_payload: | |
533 | /* Event type specific payload */ | |
534 | switch (local_event->type) { | |
535 | case LTTNG_EVENT_FUNCTION: | |
536 | /* Fallthrough */ | |
537 | case LTTNG_EVENT_PROBE: | |
538 | { | |
539 | struct lttng_payload_view probe_attr_view = | |
540 | lttng_payload_view_from_view(view, offset, | |
541 | event_comm->lttng_event_probe_attr_len); | |
542 | ||
543 | if (event_comm->lttng_event_probe_attr_len == 0) { | |
544 | ret = -1; | |
545 | goto end; | |
546 | } | |
547 | ||
548 | if (!lttng_payload_view_is_valid(&probe_attr_view)) { | |
549 | ret = -1; | |
550 | goto end; | |
551 | } | |
552 | ||
553 | ret = lttng_event_probe_attr_create_from_payload( | |
554 | &probe_attr_view, &local_probe_attr); | |
555 | if (ret < 0 || ret != event_comm->lttng_event_probe_attr_len) { | |
556 | ret = -1; | |
557 | goto end; | |
558 | } | |
559 | ||
560 | /* Copy to the local event. */ | |
561 | memcpy(&local_event->attr.probe, local_probe_attr, | |
562 | sizeof(local_event->attr.probe)); | |
563 | ||
564 | offset += ret; | |
565 | break; | |
566 | } | |
567 | case LTTNG_EVENT_FUNCTION_ENTRY: | |
568 | { | |
569 | struct lttng_payload_view function_attr_view = | |
570 | lttng_payload_view_from_view(view, offset, | |
571 | event_comm->lttng_event_function_attr_len); | |
572 | ||
573 | if (event_comm->lttng_event_function_attr_len == 0) { | |
574 | ret = -1; | |
575 | goto end; | |
576 | } | |
577 | ||
578 | if (!lttng_payload_view_is_valid(&function_attr_view)) { | |
579 | ret = -1; | |
580 | goto end; | |
581 | } | |
582 | ||
583 | ret = lttng_event_function_attr_create_from_payload( | |
584 | &function_attr_view, &local_function_attr); | |
585 | if (ret < 0 || ret != event_comm->lttng_event_function_attr_len) { | |
586 | ret = -1; | |
587 | goto end; | |
588 | } | |
589 | ||
590 | /* Copy to the local event. */ | |
591 | memcpy(&local_event->attr.ftrace, local_function_attr, | |
592 | sizeof(local_event->attr.ftrace)); | |
593 | ||
594 | offset += ret; | |
595 | ||
596 | break; | |
597 | } | |
598 | case LTTNG_EVENT_USERSPACE_PROBE: | |
599 | { | |
600 | struct lttng_payload_view userspace_probe_location_view = | |
601 | lttng_payload_view_from_view(view, offset, | |
602 | event_comm->userspace_probe_location_len); | |
603 | ||
604 | if (event_comm->userspace_probe_location_len == 0) { | |
605 | ret = -1; | |
606 | goto end; | |
607 | } | |
608 | ||
609 | if (!lttng_payload_view_is_valid( | |
610 | &userspace_probe_location_view)) { | |
611 | ret = -1; | |
612 | goto end; | |
613 | } | |
614 | ||
615 | ret = lttng_userspace_probe_location_create_from_payload( | |
616 | &userspace_probe_location_view, | |
617 | &local_userspace_probe_location); | |
618 | if (ret < 0) { | |
619 | WARN("Failed to create a userspace probe location from the received buffer"); | |
620 | ret = -1; | |
621 | goto end; | |
622 | } | |
623 | ||
624 | if (ret != event_comm->userspace_probe_location_len) { | |
5c1268e6 | 625 | WARN("Userspace probe location from the received buffer is not the advertised length: header length = %" PRIu32 ", payload length = %zd", event_comm->userspace_probe_location_len, ret); |
fe5e9e65 JR |
626 | ret = -1; |
627 | goto end; | |
628 | } | |
629 | ||
630 | /* Attach the probe location to the event. */ | |
631 | ret = lttng_event_set_userspace_probe_location( | |
632 | local_event, local_userspace_probe_location); | |
633 | if (ret) { | |
634 | ret = LTTNG_ERR_PROBE_LOCATION_INVAL; | |
635 | goto end; | |
636 | } | |
637 | ||
638 | /* | |
639 | * Userspace probe location object ownership transfered to the | |
640 | * event object. | |
641 | */ | |
642 | local_userspace_probe_location = NULL; | |
643 | offset += event_comm->userspace_probe_location_len; | |
644 | break; | |
645 | } | |
646 | case LTTNG_EVENT_TRACEPOINT: | |
647 | /* Fallthrough */ | |
648 | case LTTNG_EVENT_ALL: | |
649 | /* Fallthrough */ | |
650 | case LTTNG_EVENT_SYSCALL: | |
651 | /* Fallthrough */ | |
652 | case LTTNG_EVENT_NOOP: | |
653 | /* Nothing to do here */ | |
654 | break; | |
655 | default: | |
656 | ret = LTTNG_ERR_UND; | |
657 | goto end; | |
658 | break; | |
659 | } | |
660 | ||
661 | /* Transfer ownership to the caller. */ | |
662 | *out_event = local_event; | |
663 | local_event = NULL; | |
664 | ||
665 | if (out_bytecode) { | |
666 | *out_bytecode = local_bytecode; | |
667 | local_bytecode = NULL; | |
668 | } | |
669 | ||
670 | if (out_exclusion) { | |
671 | *out_exclusion = local_exclusions; | |
672 | local_exclusions = NULL; | |
673 | } | |
674 | ||
675 | if (out_filter_expression) { | |
676 | *out_filter_expression = local_filter_expression; | |
677 | local_filter_expression = NULL; | |
678 | } | |
679 | ||
680 | ret = offset; | |
681 | end: | |
682 | lttng_event_destroy(local_event); | |
683 | lttng_userspace_probe_location_destroy(local_userspace_probe_location); | |
684 | free(local_filter_expression); | |
685 | free(local_exclusions); | |
686 | free(local_bytecode); | |
687 | free(local_function_attr); | |
688 | free(local_probe_attr); | |
689 | return ret; | |
690 | } | |
691 | ||
692 | int lttng_event_serialize(const struct lttng_event *event, | |
693 | unsigned int exclusion_count, | |
694 | char **exclusion_list, | |
695 | char *filter_expression, | |
696 | size_t bytecode_len, | |
697 | struct lttng_bytecode *bytecode, | |
698 | struct lttng_payload *payload) | |
699 | { | |
700 | int ret; | |
701 | unsigned int i; | |
702 | size_t header_offset, size_before_payload; | |
703 | size_t name_len; | |
704 | struct lttng_event_comm event_comm = { 0 }; | |
705 | struct lttng_event_comm *header; | |
706 | ||
707 | assert(event); | |
708 | assert(payload); | |
709 | assert(exclusion_count == 0 || exclusion_list); | |
710 | ||
711 | /* Save the header location for later in-place header update. */ | |
712 | header_offset = payload->buffer.size; | |
713 | ||
714 | name_len = lttng_strnlen(event->name, LTTNG_SYMBOL_NAME_LEN); | |
715 | if (name_len == LTTNG_SYMBOL_NAME_LEN) { | |
716 | /* Event name is not NULL-terminated. */ | |
717 | ret = -1; | |
718 | goto end; | |
719 | } | |
720 | ||
721 | /* Add null termination. */ | |
722 | name_len += 1; | |
723 | ||
724 | if (exclusion_count > UINT32_MAX) { | |
725 | /* Possible overflow. */ | |
726 | ret = -1; | |
727 | goto end; | |
728 | } | |
729 | ||
730 | if (bytecode_len > UINT32_MAX) { | |
731 | /* Possible overflow. */ | |
732 | ret = -1; | |
733 | goto end; | |
734 | } | |
735 | ||
736 | event_comm.name_len = (uint32_t) name_len; | |
737 | event_comm.event_type = (int8_t) event->type; | |
738 | event_comm.loglevel_type = (int8_t) event->loglevel_type; | |
739 | event_comm.loglevel = (int32_t) event->loglevel; | |
740 | event_comm.enabled = (int8_t) event->enabled; | |
741 | event_comm.pid = (int32_t) event->pid; | |
742 | event_comm.exclusion_count = (uint32_t) exclusion_count; | |
743 | event_comm.bytecode_len = (uint32_t) bytecode_len; | |
744 | event_comm.flags = (int32_t) event->flags; | |
745 | ||
746 | if (filter_expression) { | |
747 | event_comm.filter_expression_len = | |
748 | strlen(filter_expression) + 1; | |
749 | } | |
750 | ||
751 | /* Header */ | |
752 | ret = lttng_dynamic_buffer_append( | |
753 | &payload->buffer, &event_comm, sizeof(event_comm)); | |
754 | if (ret) { | |
755 | goto end; | |
756 | } | |
757 | ||
758 | /* Event name */ | |
759 | ret = lttng_dynamic_buffer_append( | |
760 | &payload->buffer, event->name, name_len); | |
761 | if (ret) { | |
762 | goto end; | |
763 | } | |
764 | ||
765 | /* Exclusions */ | |
766 | for (i = 0; i < exclusion_count; i++) { | |
767 | const size_t exclusion_len = lttng_strnlen( | |
768 | *(exclusion_list + i), LTTNG_SYMBOL_NAME_LEN); | |
769 | const struct lttng_event_exclusion_comm exclusion_header = { | |
770 | .len = (uint32_t) exclusion_len + 1, | |
771 | }; | |
772 | ||
773 | if (exclusion_len == LTTNG_SYMBOL_NAME_LEN) { | |
774 | /* Exclusion is not NULL-terminated. */ | |
775 | ret = -1; | |
776 | goto end; | |
777 | } | |
778 | ||
779 | ret = lttng_dynamic_buffer_append(&payload->buffer, | |
780 | &exclusion_header, sizeof(exclusion_header)); | |
781 | if (ret) { | |
782 | goto end; | |
783 | } | |
784 | ||
785 | ret = lttng_dynamic_buffer_append(&payload->buffer, | |
786 | *(exclusion_list + i), exclusion_len + 1); | |
787 | if (ret) { | |
788 | goto end; | |
789 | } | |
790 | } | |
791 | ||
792 | /* Filter expression and its bytecode */ | |
793 | if (filter_expression) { | |
794 | ret = lttng_dynamic_buffer_append(&payload->buffer, | |
795 | filter_expression, | |
796 | event_comm.filter_expression_len); | |
797 | if (ret) { | |
798 | goto end; | |
799 | } | |
800 | ||
801 | /* | |
802 | * Bytecode can be absent when we serialize to the client | |
803 | * for listing. | |
804 | */ | |
805 | if (bytecode) { | |
806 | ret = lttng_dynamic_buffer_append(&payload->buffer, | |
807 | bytecode, bytecode_len); | |
808 | if (ret) { | |
809 | goto end; | |
810 | } | |
811 | } | |
812 | } | |
813 | ||
814 | size_before_payload = payload->buffer.size; | |
815 | ||
816 | /* Event type specific payload */ | |
817 | switch (event->type) { | |
818 | case LTTNG_EVENT_FUNCTION: | |
819 | /* Fallthrough */ | |
820 | case LTTNG_EVENT_PROBE: | |
821 | ret = lttng_event_probe_attr_serialize(&event->attr.probe, payload); | |
822 | if (ret) { | |
823 | ret = -1; | |
824 | goto end; | |
825 | } | |
826 | ||
827 | header = (struct lttng_event_comm *) ((char *) payload->buffer.data + | |
828 | header_offset); | |
829 | header->lttng_event_probe_attr_len = | |
830 | payload->buffer.size - size_before_payload; | |
831 | ||
832 | break; | |
833 | case LTTNG_EVENT_FUNCTION_ENTRY: | |
834 | ret = lttng_event_function_attr_serialize( | |
835 | &event->attr.ftrace, payload); | |
836 | if (ret) { | |
837 | ret = -1; | |
838 | goto end; | |
839 | } | |
840 | ||
841 | /* Update the lttng_event_function_attr len. */ | |
842 | header = (struct lttng_event_comm *) ((char *) payload->buffer.data + | |
843 | header_offset); | |
844 | header->lttng_event_function_attr_len = | |
845 | payload->buffer.size - size_before_payload; | |
846 | ||
847 | break; | |
848 | case LTTNG_EVENT_USERSPACE_PROBE: | |
849 | { | |
850 | const struct lttng_event_extended *ev_ext = | |
851 | (const struct lttng_event_extended *) | |
852 | event->extended.ptr; | |
853 | ||
854 | assert(event->extended.ptr); | |
855 | assert(ev_ext->probe_location); | |
856 | ||
857 | size_before_payload = payload->buffer.size; | |
858 | if (ev_ext->probe_location) { | |
859 | /* | |
860 | * lttng_userspace_probe_location_serialize returns the | |
861 | * number of bytes that were appended to the buffer. | |
862 | */ | |
863 | ret = lttng_userspace_probe_location_serialize( | |
864 | ev_ext->probe_location, payload); | |
865 | if (ret < 0) { | |
866 | goto end; | |
867 | } | |
868 | ||
869 | ret = 0; | |
870 | ||
871 | /* Update the userspace probe location len. */ | |
872 | header = (struct lttng_event_comm *) ((char *) payload->buffer.data + | |
873 | header_offset); | |
874 | header->userspace_probe_location_len = | |
875 | payload->buffer.size - size_before_payload; | |
876 | } | |
877 | break; | |
878 | } | |
879 | case LTTNG_EVENT_TRACEPOINT: | |
880 | /* Fallthrough */ | |
881 | case LTTNG_EVENT_ALL: | |
882 | /* Fallthrough */ | |
883 | default: | |
884 | /* Nothing to do here. */ | |
885 | break; | |
886 | } | |
887 | ||
888 | end: | |
889 | return ret; | |
890 | } | |
891 | ||
a4a3d6bd JR |
892 | static ssize_t lttng_event_context_app_populate_from_payload( |
893 | const struct lttng_payload_view *view, | |
894 | struct lttng_event_context *event_ctx) | |
895 | { | |
896 | ssize_t ret, offset = 0; | |
897 | const struct lttng_event_context_app_comm *comm; | |
898 | char *provider_name = NULL, *context_name = NULL; | |
899 | size_t provider_name_len, context_name_len; | |
900 | const struct lttng_buffer_view comm_view = lttng_buffer_view_from_view( | |
901 | &view->buffer, offset, sizeof(*comm)); | |
902 | ||
903 | assert(event_ctx->ctx == LTTNG_EVENT_CONTEXT_APP_CONTEXT); | |
904 | ||
905 | if (!lttng_buffer_view_is_valid(&comm_view)) { | |
906 | ret = -1; | |
907 | goto end; | |
908 | } | |
909 | ||
910 | comm = (typeof(comm)) comm_view.data; | |
911 | offset += sizeof(*comm); | |
912 | ||
913 | provider_name_len = comm->provider_name_len; | |
914 | context_name_len = comm->ctx_name_len; | |
915 | ||
916 | if (provider_name_len == 0 || context_name_len == 0) { | |
917 | /* | |
918 | * Application provider and context names MUST | |
919 | * be provided. | |
920 | */ | |
921 | ret = -1; | |
922 | goto end; | |
923 | } | |
924 | ||
925 | { | |
926 | const char *name; | |
927 | const struct lttng_buffer_view provider_name_view = | |
928 | lttng_buffer_view_from_view(&view->buffer, | |
929 | offset, | |
930 | provider_name_len); | |
931 | ||
932 | if (!lttng_buffer_view_is_valid(&provider_name_view)) { | |
933 | ret = -1; | |
934 | goto end; | |
935 | } | |
936 | ||
937 | name = provider_name_view.data; | |
938 | ||
939 | if (!lttng_buffer_view_contains_string(&provider_name_view, | |
940 | name, provider_name_len)) { | |
941 | ret = -1; | |
942 | goto end; | |
943 | } | |
944 | ||
945 | provider_name = lttng_strndup(name, provider_name_len); | |
946 | if (!provider_name) { | |
947 | ret = -1; | |
948 | goto end; | |
949 | } | |
950 | ||
951 | offset += provider_name_len; | |
952 | } | |
953 | ||
954 | { | |
955 | const char *name; | |
956 | const struct lttng_buffer_view context_name_view = | |
957 | lttng_buffer_view_from_view( | |
958 | &view->buffer, offset, | |
959 | context_name_len); | |
960 | ||
961 | if (!lttng_buffer_view_is_valid(&context_name_view)) { | |
962 | ret = -1; | |
963 | goto end; | |
964 | } | |
965 | ||
966 | name = context_name_view.data; | |
967 | ||
968 | if (!lttng_buffer_view_contains_string(&context_name_view, name, | |
969 | context_name_len)) { | |
970 | ret = -1; | |
971 | goto end; | |
972 | } | |
973 | ||
974 | context_name = lttng_strndup(name, context_name_len); | |
975 | if (!context_name) { | |
976 | ret = -1; | |
977 | goto end; | |
978 | } | |
979 | ||
980 | offset += context_name_len; | |
981 | } | |
982 | ||
983 | /* Transfer ownership of the strings */ | |
984 | event_ctx->u.app_ctx.provider_name = provider_name; | |
985 | event_ctx->u.app_ctx.ctx_name = context_name; | |
986 | provider_name = NULL; | |
987 | context_name = NULL; | |
988 | ||
989 | ret = offset; | |
990 | end: | |
991 | free(provider_name); | |
992 | free(context_name); | |
993 | ||
994 | return ret; | |
995 | } | |
996 | ||
997 | static ssize_t lttng_event_context_perf_counter_populate_from_payload( | |
998 | const struct lttng_payload_view *view, | |
999 | struct lttng_event_context *event_ctx) | |
1000 | { | |
5a1367e4 JR |
1001 | int ret; |
1002 | ssize_t consumed, offset = 0; | |
a4a3d6bd JR |
1003 | const struct lttng_event_context_perf_counter_comm *comm; |
1004 | size_t name_len; | |
1005 | const struct lttng_buffer_view comm_view = lttng_buffer_view_from_view( | |
1006 | &view->buffer, offset, sizeof(*comm)); | |
1007 | ||
1008 | assert(event_ctx->ctx == LTTNG_EVENT_CONTEXT_PERF_COUNTER || | |
1009 | event_ctx->ctx == | |
1010 | LTTNG_EVENT_CONTEXT_PERF_THREAD_COUNTER || | |
1011 | event_ctx->ctx == LTTNG_EVENT_CONTEXT_PERF_CPU_COUNTER); | |
1012 | ||
1013 | if (!lttng_buffer_view_is_valid(&comm_view)) { | |
5a1367e4 | 1014 | consumed = -1; |
a4a3d6bd JR |
1015 | goto end; |
1016 | } | |
1017 | ||
1018 | comm = (typeof(comm)) comm_view.data; | |
1019 | offset += sizeof(*comm); | |
1020 | ||
1021 | name_len = comm->name_len; | |
1022 | ||
1023 | { | |
1024 | const char *name; | |
1025 | const struct lttng_buffer_view provider_name_view = | |
1026 | lttng_buffer_view_from_view( | |
1027 | &view->buffer, offset, | |
1028 | name_len); | |
1029 | ||
1030 | if (!lttng_buffer_view_is_valid(&provider_name_view)) { | |
5a1367e4 | 1031 | consumed = -1; |
a4a3d6bd JR |
1032 | goto end; |
1033 | } | |
1034 | ||
1035 | name = provider_name_view.data; | |
1036 | ||
1037 | if (!lttng_buffer_view_contains_string( | |
1038 | &provider_name_view, name, name_len)) { | |
5a1367e4 | 1039 | consumed = -1; |
a4a3d6bd JR |
1040 | goto end; |
1041 | } | |
1042 | ||
856b414b JG |
1043 | ret = lttng_strncpy(event_ctx->u.perf_counter.name, name, |
1044 | sizeof(event_ctx->u.perf_counter.name)); | |
5a1367e4 JR |
1045 | if (ret) { |
1046 | consumed = -1; | |
1047 | goto end; | |
1048 | } | |
a4a3d6bd JR |
1049 | offset += name_len; |
1050 | } | |
1051 | ||
1052 | event_ctx->u.perf_counter.config = comm->config; | |
1053 | event_ctx->u.perf_counter.type = comm->type; | |
1054 | ||
5a1367e4 | 1055 | consumed = offset; |
a4a3d6bd JR |
1056 | |
1057 | end: | |
5a1367e4 | 1058 | return consumed; |
a4a3d6bd JR |
1059 | } |
1060 | ||
1061 | ssize_t lttng_event_context_create_from_payload( | |
1062 | struct lttng_payload_view *view, | |
1063 | struct lttng_event_context **event_ctx) | |
1064 | { | |
1065 | ssize_t ret, offset = 0; | |
1066 | const struct lttng_event_context_comm *comm; | |
1067 | struct lttng_event_context *local_context = NULL; | |
1068 | struct lttng_buffer_view comm_view = lttng_buffer_view_from_view( | |
1069 | &view->buffer, offset, sizeof(*comm)); | |
1070 | ||
1071 | assert(event_ctx); | |
1072 | assert(view); | |
1073 | ||
1074 | if (!lttng_buffer_view_is_valid(&comm_view)) { | |
1075 | ret = -1; | |
1076 | goto end; | |
1077 | } | |
1078 | ||
1079 | comm = (typeof(comm)) comm_view.data; | |
1080 | offset += sizeof(*comm); | |
1081 | ||
1082 | local_context = (struct lttng_event_context *) | |
1083 | zmalloc(sizeof(*local_context)); | |
1084 | if (!local_context) { | |
1085 | ret = -1; | |
1086 | goto end; | |
1087 | } | |
1088 | ||
1089 | local_context->ctx = (enum lttng_event_context_type) comm->type; | |
1090 | ||
1091 | { | |
1092 | struct lttng_payload_view subtype_view = | |
1093 | lttng_payload_view_from_view(view, offset, -1); | |
1094 | ||
1095 | switch (local_context->ctx) { | |
1096 | case LTTNG_EVENT_CONTEXT_APP_CONTEXT: | |
1097 | ret = lttng_event_context_app_populate_from_payload( | |
1098 | &subtype_view, local_context); | |
1099 | break; | |
1100 | case LTTNG_EVENT_CONTEXT_PERF_COUNTER: | |
1101 | case LTTNG_EVENT_CONTEXT_PERF_THREAD_COUNTER: | |
1102 | case LTTNG_EVENT_CONTEXT_PERF_CPU_COUNTER: | |
1103 | ret = lttng_event_context_perf_counter_populate_from_payload( | |
1104 | &subtype_view, local_context); | |
1105 | break; | |
1106 | default: | |
1107 | /* Nothing else to deserialize. */ | |
1108 | ret = 0; | |
1109 | break; | |
1110 | } | |
1111 | } | |
1112 | ||
1113 | if (ret < 0) { | |
1114 | goto end; | |
1115 | } | |
1116 | ||
1117 | offset += ret; | |
1118 | ||
1119 | *event_ctx = local_context; | |
1120 | local_context = NULL; | |
1121 | ret = offset; | |
1122 | ||
1123 | end: | |
1124 | free(local_context); | |
1125 | return ret; | |
1126 | } | |
1127 | ||
1128 | static int lttng_event_context_app_serialize( | |
1129 | struct lttng_event_context *context, | |
1130 | struct lttng_payload *payload) | |
1131 | { | |
1132 | int ret; | |
1133 | struct lttng_event_context_app_comm comm = { 0 }; | |
1134 | size_t provider_len, ctx_len; | |
1135 | const char *provider_name; | |
1136 | const char *ctx_name; | |
1137 | ||
1138 | assert(payload); | |
1139 | assert(context); | |
1140 | assert(context->ctx == LTTNG_EVENT_CONTEXT_APP_CONTEXT); | |
1141 | ||
1142 | provider_name = context->u.app_ctx.provider_name; | |
1143 | ctx_name = context->u.app_ctx.ctx_name; | |
1144 | ||
1145 | if (!provider_name || !ctx_name) { | |
1146 | ret = -LTTNG_ERR_INVALID; | |
1147 | goto end; | |
1148 | } | |
1149 | ||
1150 | provider_len = strlen(provider_name); | |
1151 | if (provider_len == 0) { | |
1152 | ret = -LTTNG_ERR_INVALID; | |
1153 | goto end; | |
1154 | } | |
1155 | ||
1156 | /* Include the null terminator. */ | |
aca0a945 JR |
1157 | provider_len += 1; |
1158 | comm.provider_name_len = provider_len; | |
a4a3d6bd JR |
1159 | |
1160 | ctx_len = strlen(ctx_name); | |
1161 | if (ctx_len == 0) { | |
1162 | ret = -LTTNG_ERR_INVALID; | |
1163 | goto end; | |
1164 | } | |
1165 | ||
1166 | /* Include the null terminator. */ | |
aca0a945 JR |
1167 | ctx_len += 1; |
1168 | comm.ctx_name_len = ctx_len; | |
a4a3d6bd JR |
1169 | |
1170 | /* Header */ | |
1171 | ret = lttng_dynamic_buffer_append(&payload->buffer, &comm, | |
1172 | sizeof(comm)); | |
1173 | if (ret) { | |
1174 | ret = -1; | |
1175 | goto end; | |
1176 | } | |
1177 | ||
1178 | ret = lttng_dynamic_buffer_append(&payload->buffer, provider_name, | |
1179 | provider_len); | |
1180 | if (ret) { | |
1181 | ret = -1; | |
1182 | goto end; | |
1183 | } | |
1184 | ||
1185 | ret = lttng_dynamic_buffer_append(&payload->buffer, ctx_name, | |
1186 | ctx_len); | |
1187 | if (ret) { | |
1188 | ret = -1; | |
1189 | goto end; | |
1190 | } | |
1191 | ||
1192 | end: | |
1193 | return ret; | |
1194 | } | |
1195 | ||
1196 | static int lttng_event_context_perf_counter_serialize( | |
1197 | struct lttng_event_perf_counter_ctx *context, | |
1198 | struct lttng_payload *payload) | |
1199 | { | |
1200 | int ret; | |
1201 | struct lttng_event_context_perf_counter_comm comm = { 0 }; | |
1202 | ||
1203 | assert(payload); | |
1204 | assert(context); | |
1205 | ||
1206 | comm.config = context->config; | |
1207 | comm.type = context->type; | |
1208 | comm.name_len = lttng_strnlen(context->name, LTTNG_SYMBOL_NAME_LEN); | |
1209 | ||
1210 | if (comm.name_len == LTTNG_SYMBOL_NAME_LEN) { | |
1211 | ret = -1; | |
1212 | goto end; | |
1213 | } | |
1214 | ||
1215 | /* Include the null terminator. */ | |
1216 | comm.name_len += 1; | |
1217 | ||
1218 | /* Header */ | |
1219 | ret = lttng_dynamic_buffer_append(&payload->buffer, &comm, | |
1220 | sizeof(comm)); | |
1221 | if (ret) { | |
1222 | ret = -1; | |
1223 | goto end; | |
1224 | } | |
1225 | ||
1226 | ret = lttng_dynamic_buffer_append(&payload->buffer, context->name, | |
1227 | comm.name_len); | |
1228 | if (ret) { | |
1229 | ret = -1; | |
1230 | goto end; | |
1231 | } | |
1232 | ||
1233 | end: | |
1234 | return ret; | |
1235 | } | |
1236 | ||
1237 | int lttng_event_context_serialize(struct lttng_event_context *context, | |
1238 | struct lttng_payload *payload) | |
1239 | { | |
1240 | int ret; | |
1241 | struct lttng_event_context_comm context_comm = { 0 }; | |
1242 | ||
1243 | assert(context); | |
1244 | assert(payload); | |
1245 | ||
1246 | context_comm.type = (uint32_t) context->ctx; | |
1247 | ||
1248 | /* Header */ | |
1249 | ret = lttng_dynamic_buffer_append( | |
1250 | &payload->buffer, &context_comm, sizeof(context_comm)); | |
1251 | if (ret) { | |
1252 | goto end; | |
1253 | } | |
1254 | ||
1255 | switch (context->ctx) { | |
1256 | case LTTNG_EVENT_CONTEXT_APP_CONTEXT: | |
1257 | ret = lttng_event_context_app_serialize(context, payload); | |
1258 | break; | |
1259 | case LTTNG_EVENT_CONTEXT_PERF_COUNTER: | |
1260 | case LTTNG_EVENT_CONTEXT_PERF_THREAD_COUNTER: | |
1261 | case LTTNG_EVENT_CONTEXT_PERF_CPU_COUNTER: | |
1262 | ret = lttng_event_context_perf_counter_serialize( | |
1263 | &context->u.perf_counter, payload); | |
1264 | break; | |
1265 | default: | |
1266 | /* Nothing else to serialize. */ | |
1267 | break; | |
1268 | } | |
1269 | ||
1270 | if (ret) { | |
1271 | goto end; | |
1272 | } | |
1273 | ||
1274 | end: | |
1275 | return ret; | |
1276 | } | |
1277 | ||
1278 | void lttng_event_context_destroy(struct lttng_event_context *context) | |
1279 | { | |
1280 | if (!context) { | |
1281 | return; | |
1282 | } | |
1283 | ||
1284 | if (context->ctx == LTTNG_EVENT_CONTEXT_APP_CONTEXT) { | |
1285 | free(context->u.app_ctx.provider_name); | |
1286 | free(context->u.app_ctx.ctx_name); | |
1287 | } | |
1288 | ||
1289 | free(context); | |
1290 | } | |
1291 | ||
997edb99 JR |
1292 | /* |
1293 | * This is a specialized populate for lttng_event_field since it ignores | |
1294 | * the extension field of the lttng_event struct and simply copies what it can | |
1295 | * to the internal struct lttng_event of a lttng_event_field. | |
1296 | */ | |
1297 | static void lttng_event_field_populate_lttng_event_from_event( | |
1298 | const struct lttng_event *src, struct lttng_event *destination) | |
1299 | { | |
1300 | memcpy(destination, src, sizeof(*destination)); | |
1301 | ||
1302 | /* Remove all possible dynamic data from the destination event rule. */ | |
1303 | destination->extended.ptr = NULL; | |
1304 | } | |
1305 | ||
1306 | ssize_t lttng_event_field_create_from_payload( | |
1307 | struct lttng_payload_view *view, | |
1308 | struct lttng_event_field **field) | |
1309 | { | |
1310 | ssize_t ret, offset = 0; | |
1311 | struct lttng_event_field *local_event_field = NULL; | |
1312 | struct lttng_event *event = NULL; | |
1313 | const struct lttng_event_field_comm *comm; | |
1314 | const char* name = NULL; | |
1315 | ||
1316 | assert(field); | |
1317 | assert(view); | |
1318 | ||
1319 | { | |
1320 | const struct lttng_buffer_view comm_view = | |
1321 | lttng_buffer_view_from_view( | |
1322 | &view->buffer, offset, | |
1323 | sizeof(*comm)); | |
1324 | ||
1325 | if (!lttng_buffer_view_is_valid(&comm_view)) { | |
1326 | ret = -1; | |
1327 | goto end; | |
1328 | } | |
1329 | ||
1330 | /* lttng_event_field_comm header */ | |
1331 | comm = (const struct lttng_event_field_comm *) comm_view.data; | |
1332 | offset += sizeof(*comm); | |
1333 | } | |
1334 | ||
1335 | local_event_field = (struct lttng_event_field *) | |
1336 | zmalloc(sizeof(*local_event_field)); | |
1337 | if (!local_event_field) { | |
1338 | ret = -1; | |
1339 | goto end; | |
1340 | } | |
1341 | ||
1342 | local_event_field->type = (enum lttng_event_field_type) comm->type; | |
1343 | local_event_field->nowrite = comm->nowrite; | |
1344 | ||
1345 | /* Field name */ | |
1346 | { | |
1347 | const struct lttng_buffer_view name_view = | |
1348 | lttng_buffer_view_from_view( | |
1349 | &view->buffer, offset, | |
1350 | comm->name_len); | |
1351 | ||
1352 | if (!lttng_buffer_view_is_valid(&name_view)) { | |
1353 | ret = -1; | |
1354 | goto end; | |
1355 | } | |
1356 | ||
1357 | name = name_view.data; | |
1358 | ||
1359 | if (!lttng_buffer_view_contains_string(&name_view, | |
1360 | name_view.data, comm->name_len)) { | |
1361 | ret = -1; | |
1362 | goto end; | |
1363 | } | |
1364 | ||
1365 | if (comm->name_len > LTTNG_SYMBOL_NAME_LEN - 1) { | |
1366 | /* Name is too long.*/ | |
1367 | ret = -1; | |
1368 | goto end; | |
1369 | } | |
1370 | ||
1371 | offset += comm->name_len; | |
1372 | } | |
1373 | ||
1374 | /* Event */ | |
1375 | { | |
1376 | struct lttng_payload_view event_view = | |
1377 | lttng_payload_view_from_view( | |
1378 | view, offset, | |
1379 | comm->event_len); | |
1380 | ||
1381 | if (!lttng_payload_view_is_valid(&event_view)) { | |
1382 | ret = -1; | |
1383 | goto end; | |
1384 | } | |
1385 | ||
1386 | ret = lttng_event_create_from_payload(&event_view, &event, NULL, | |
1387 | NULL, NULL); | |
1388 | if (ret != comm->event_len) { | |
1389 | ret = -1; | |
1390 | goto end; | |
1391 | } | |
1392 | ||
1393 | offset += ret; | |
1394 | } | |
1395 | ||
1396 | assert(name); | |
1397 | assert(event); | |
1398 | ||
1399 | if (lttng_strncpy(local_event_field->field_name, name , LTTNG_SYMBOL_NAME_LEN)) { | |
1400 | ret = -1; | |
1401 | goto end; | |
1402 | } | |
1403 | ||
1404 | lttng_event_field_populate_lttng_event_from_event( | |
1405 | event, &local_event_field->event); | |
1406 | ||
1407 | *field = local_event_field; | |
1408 | local_event_field = NULL; | |
1409 | ret = offset; | |
1410 | end: | |
1411 | lttng_event_destroy(event); | |
1412 | free(local_event_field); | |
1413 | return ret; | |
1414 | } | |
1415 | ||
1416 | int lttng_event_field_serialize(const struct lttng_event_field *field, | |
1417 | struct lttng_payload *payload) | |
1418 | { | |
1419 | int ret; | |
1420 | size_t header_offset, size_before_event; | |
1421 | size_t name_len; | |
1422 | struct lttng_event_field_comm event_field_comm = { 0 }; | |
1423 | struct lttng_event_field_comm *header; | |
1424 | ||
1425 | assert(field); | |
1426 | assert(payload); | |
1427 | ||
1428 | /* Save the header location for later in-place header update. */ | |
1429 | header_offset = payload->buffer.size; | |
1430 | ||
1431 | name_len = strnlen(field->field_name, LTTNG_SYMBOL_NAME_LEN); | |
1432 | if (name_len == LTTNG_SYMBOL_NAME_LEN) { | |
1433 | /* Event name is not NULL-terminated. */ | |
1434 | ret = -1; | |
1435 | goto end; | |
1436 | } | |
1437 | ||
1438 | /* Add null termination. */ | |
1439 | name_len += 1; | |
1440 | ||
1441 | event_field_comm.type = field->type; | |
1442 | event_field_comm.nowrite = (uint8_t)field->nowrite; | |
1443 | event_field_comm.name_len = name_len; | |
1444 | ||
1445 | /* Header */ | |
1446 | ret = lttng_dynamic_buffer_append( | |
1447 | &payload->buffer, &event_field_comm, | |
1448 | sizeof(event_field_comm)); | |
1449 | if (ret) { | |
1450 | goto end; | |
1451 | } | |
1452 | ||
1453 | /* Field name */ | |
1454 | ret = lttng_dynamic_buffer_append(&payload->buffer, field->field_name, | |
1455 | name_len); | |
1456 | if (ret) { | |
1457 | goto end; | |
1458 | } | |
1459 | ||
1460 | size_before_event = payload->buffer.size; | |
1461 | ret = lttng_event_serialize( | |
1462 | &field->event, 0, NULL, NULL, 0, 0, payload); | |
1463 | if (ret) { | |
1464 | ret = -1; | |
1465 | goto end; | |
1466 | } | |
1467 | ||
1468 | /* Update the event len. */ | |
1469 | header = (struct lttng_event_field_comm *) | |
1470 | ((char *) payload->buffer.data + | |
1471 | header_offset); | |
1472 | header->event_len = payload->buffer.size - size_before_event; | |
1473 | ||
1474 | end: | |
1475 | return ret; | |
1476 | } | |
1477 | ||
fe5e9e65 JR |
1478 | static enum lttng_error_code compute_flattened_size( |
1479 | struct lttng_dynamic_pointer_array *events, size_t *size) | |
1480 | { | |
1481 | enum lttng_error_code ret_code; | |
1482 | int ret = 0; | |
1483 | size_t storage_req, event_count, i; | |
1484 | ||
1485 | assert(size); | |
1486 | assert(events); | |
1487 | ||
1488 | event_count = lttng_dynamic_pointer_array_get_count(events); | |
1489 | ||
1490 | /* The basic struct lttng_event */ | |
1491 | storage_req = event_count * sizeof(struct lttng_event); | |
1492 | ||
09c640ad JG |
1493 | /* The struct·lttng_event_extended */ |
1494 | storage_req += event_count * sizeof(struct lttng_event_extended); | |
1495 | ||
fe5e9e65 JR |
1496 | for (i = 0; i < event_count; i++) { |
1497 | int probe_storage_req = 0; | |
1498 | const struct event_list_element *element = (const struct event_list_element *) | |
1499 | lttng_dynamic_pointer_array_get_pointer( | |
1500 | events, i); | |
1501 | const struct lttng_userspace_probe_location *location = NULL; | |
1502 | ||
1503 | location = lttng_event_get_userspace_probe_location( | |
1504 | element->event); | |
1505 | if (location) { | |
1506 | ret = lttng_userspace_probe_location_flatten( | |
1507 | location, NULL); | |
1508 | if (ret < 0) { | |
1509 | ret_code = LTTNG_ERR_PROBE_LOCATION_INVAL; | |
1510 | goto end; | |
1511 | } | |
1512 | ||
1513 | probe_storage_req = ret; | |
1514 | } | |
1515 | ||
fe5e9e65 JR |
1516 | if (element->filter_expression) { |
1517 | storage_req += strlen(element->filter_expression) + 1; | |
1518 | } | |
1519 | ||
1520 | if (element->exclusions) { | |
1521 | storage_req += element->exclusions->count * | |
1522 | LTTNG_SYMBOL_NAME_LEN; | |
1523 | } | |
1524 | ||
1525 | /* Padding to ensure the flat probe is aligned. */ | |
1526 | storage_req = ALIGN_TO(storage_req, sizeof(uint64_t)); | |
1527 | storage_req += probe_storage_req; | |
1528 | } | |
1529 | ||
1530 | *size = storage_req; | |
1531 | ret_code = LTTNG_OK; | |
1532 | ||
1533 | end: | |
1534 | return ret_code; | |
1535 | } | |
1536 | ||
1537 | /* | |
1538 | * Flatten a list of struct lttng_event. | |
1539 | * | |
1540 | * The buffer that is returned to the API client must contain a "flat" version | |
1541 | * of the events that are returned. In other words, all pointers within an | |
1542 | * lttng_event must point to a location within the returned buffer so that the | |
1543 | * user may free everything by simply calling free() on the returned buffer. | |
1544 | * This is needed in order to maintain API compatibility. | |
1545 | * | |
1546 | * A first pass is performed to compute the size of the buffer that must be | |
1547 | * allocated. A second pass is then performed to setup the returned events so | |
1548 | * that their members always point within the buffer. | |
1549 | * | |
1550 | * The layout of the returned buffer is as follows: | |
1551 | * - struct lttng_event[nb_events], | |
1552 | * - nb_events times the following: | |
1553 | * - struct lttng_event_extended, | |
1554 | * - filter_expression | |
1555 | * - exclusions | |
1556 | * - padding to align to 64-bits | |
1557 | * - flattened version of userspace_probe_location | |
1558 | */ | |
1559 | static enum lttng_error_code flatten_lttng_events( | |
1560 | struct lttng_dynamic_pointer_array *events, | |
1561 | struct lttng_event **flattened_events) | |
1562 | { | |
1563 | enum lttng_error_code ret_code; | |
1564 | int ret, i; | |
1565 | size_t storage_req; | |
1566 | struct lttng_dynamic_buffer local_flattened_events; | |
1567 | int nb_events; | |
1568 | ||
1569 | assert(events); | |
1570 | assert(flattened_events); | |
1571 | ||
1572 | lttng_dynamic_buffer_init(&local_flattened_events); | |
1573 | nb_events = lttng_dynamic_pointer_array_get_count(events); | |
1574 | ||
1575 | ret_code = compute_flattened_size(events, &storage_req); | |
1576 | if (ret_code != LTTNG_OK) { | |
1577 | goto end; | |
1578 | } | |
1579 | ||
1580 | /* | |
1581 | * We must ensure that "local_flattened_events" is never resized so as | |
1582 | * to preserve the validity of the flattened objects. | |
1583 | */ | |
1584 | ret = lttng_dynamic_buffer_set_capacity( | |
1585 | &local_flattened_events, storage_req); | |
1586 | if (ret) { | |
1587 | ret_code = LTTNG_ERR_NOMEM; | |
1588 | goto end; | |
1589 | } | |
1590 | ||
1591 | /* Start by laying the struct lttng_event */ | |
1592 | for (i = 0; i < nb_events; i++) { | |
1593 | const struct event_list_element *element = (const struct event_list_element *) | |
1594 | lttng_dynamic_pointer_array_get_pointer( | |
1595 | events, i); | |
1596 | ||
1597 | if (!element) { | |
1598 | ret_code = LTTNG_ERR_FATAL; | |
1599 | goto end; | |
1600 | } | |
1601 | ||
1602 | ret = lttng_dynamic_buffer_append(&local_flattened_events, | |
1603 | element->event, sizeof(struct lttng_event)); | |
1604 | if (ret) { | |
1605 | ret_code = LTTNG_ERR_NOMEM; | |
1606 | goto end; | |
1607 | } | |
1608 | } | |
1609 | ||
1610 | for (i = 0; i < nb_events; i++) { | |
1611 | const struct event_list_element *element = (const struct event_list_element *) | |
1612 | lttng_dynamic_pointer_array_get_pointer(events, i); | |
1613 | struct lttng_event *event = (struct lttng_event *) | |
1614 | (local_flattened_events.data + (sizeof(struct lttng_event) * i)); | |
1615 | struct lttng_event_extended *event_extended = | |
1616 | (struct lttng_event_extended *) | |
1617 | (local_flattened_events.data + local_flattened_events.size); | |
1618 | const struct lttng_userspace_probe_location *location = NULL; | |
1619 | ||
1620 | assert(element); | |
1621 | ||
1622 | /* Insert struct lttng_event_extended. */ | |
1623 | ret = lttng_dynamic_buffer_set_size(&local_flattened_events, | |
1624 | local_flattened_events.size + | |
1625 | sizeof(*event_extended)); | |
1626 | if (ret) { | |
1627 | ret_code = LTTNG_ERR_NOMEM; | |
1628 | goto end; | |
1629 | } | |
1630 | event->extended.ptr = event_extended; | |
1631 | ||
1632 | /* Insert filter expression. */ | |
1633 | if (element->filter_expression) { | |
1634 | const size_t len = strlen(element->filter_expression) + 1; | |
1635 | ||
1636 | event_extended->filter_expression = | |
1637 | local_flattened_events.data + | |
1638 | local_flattened_events.size; | |
1639 | ret = lttng_dynamic_buffer_append( | |
1640 | &local_flattened_events, | |
1641 | element->filter_expression, len); | |
1642 | if (ret) { | |
1643 | ret_code = LTTNG_ERR_NOMEM; | |
1644 | goto end; | |
1645 | } | |
1646 | } | |
1647 | ||
1648 | /* Insert exclusions. */ | |
1649 | if (element->exclusions) { | |
1650 | event_extended->exclusions.count = | |
1651 | element->exclusions->count; | |
1652 | event_extended->exclusions.strings = | |
1653 | local_flattened_events.data + | |
1654 | local_flattened_events.size; | |
1655 | ||
1656 | ret = lttng_dynamic_buffer_append( | |
1657 | &local_flattened_events, | |
1658 | element->exclusions->names, | |
1659 | element->exclusions->count * | |
1660 | LTTNG_SYMBOL_NAME_LEN); | |
1661 | if (ret) { | |
1662 | ret_code = LTTNG_ERR_NOMEM; | |
1663 | goto end; | |
1664 | } | |
1665 | } | |
1666 | ||
1667 | /* Insert padding to align to 64-bits. */ | |
1668 | ret = lttng_dynamic_buffer_set_size(&local_flattened_events, | |
1669 | ALIGN_TO(local_flattened_events.size, | |
1670 | sizeof(uint64_t))); | |
1671 | if (ret) { | |
1672 | ret_code = LTTNG_ERR_NOMEM; | |
1673 | goto end; | |
1674 | } | |
1675 | ||
1676 | location = lttng_event_get_userspace_probe_location( | |
1677 | element->event); | |
1678 | if (location) { | |
1679 | event_extended->probe_location = (struct lttng_userspace_probe_location *) | |
1680 | (local_flattened_events.data + local_flattened_events.size); | |
1681 | ret = lttng_userspace_probe_location_flatten( | |
1682 | location, &local_flattened_events); | |
1683 | if (ret < 0) { | |
1684 | ret_code = LTTNG_ERR_PROBE_LOCATION_INVAL; | |
1685 | goto end; | |
1686 | } | |
1687 | } | |
1688 | } | |
1689 | ||
1690 | /* Don't reset local_flattened_events buffer as we return its content. */ | |
1691 | *flattened_events = (struct lttng_event *) local_flattened_events.data; | |
1692 | lttng_dynamic_buffer_init(&local_flattened_events); | |
1693 | ret_code = LTTNG_OK; | |
1694 | end: | |
1695 | lttng_dynamic_buffer_reset(&local_flattened_events); | |
1696 | return ret_code; | |
1697 | } | |
1698 | ||
1699 | static enum lttng_error_code event_list_create_from_payload( | |
1700 | struct lttng_payload_view *view, | |
1701 | unsigned int count, | |
1702 | struct lttng_dynamic_pointer_array *event_list) | |
1703 | { | |
1704 | enum lttng_error_code ret_code; | |
1705 | int ret; | |
1706 | unsigned int i; | |
1707 | int offset = 0; | |
1708 | ||
1709 | assert(view); | |
1710 | assert(event_list); | |
1711 | ||
1712 | for (i = 0; i < count; i++) { | |
1713 | ssize_t event_size; | |
1714 | struct lttng_payload_view event_view = | |
1715 | lttng_payload_view_from_view(view, offset, -1); | |
1716 | struct event_list_element *element = | |
1717 | (struct event_list_element *) zmalloc(sizeof(*element)); | |
1718 | ||
1719 | if (!element) { | |
1720 | ret_code = LTTNG_ERR_NOMEM; | |
1721 | goto end; | |
1722 | } | |
1723 | ||
1724 | /* | |
1725 | * Lifetime and management of the object is now bound to the | |
1726 | * array. | |
1727 | */ | |
1728 | ret = lttng_dynamic_pointer_array_add_pointer( | |
1729 | event_list, element); | |
1730 | if (ret) { | |
1731 | event_list_destructor(element); | |
1732 | ret_code = LTTNG_ERR_NOMEM; | |
1733 | goto end; | |
1734 | } | |
1735 | ||
1736 | /* | |
1737 | * Bytecode is not transmitted on listing in any case we do not | |
1738 | * care about it. | |
1739 | */ | |
1740 | event_size = lttng_event_create_from_payload(&event_view, | |
1741 | &element->event, | |
1742 | &element->exclusions, | |
1743 | &element->filter_expression, NULL); | |
1744 | if (event_size < 0) { | |
1745 | ret_code = LTTNG_ERR_INVALID; | |
1746 | goto end; | |
1747 | } | |
1748 | ||
1749 | offset += event_size; | |
1750 | } | |
1751 | ||
1752 | if (view->buffer.size != offset) { | |
1753 | ret_code = LTTNG_ERR_INVALID_PROTOCOL; | |
1754 | goto end; | |
1755 | } | |
1756 | ||
1757 | ret_code = LTTNG_OK; | |
1758 | ||
1759 | end: | |
1760 | return ret_code; | |
1761 | } | |
1762 | ||
1763 | enum lttng_error_code lttng_events_create_and_flatten_from_payload( | |
1764 | struct lttng_payload_view *payload, | |
1765 | unsigned int count, | |
1766 | struct lttng_event **events) | |
1767 | { | |
1768 | enum lttng_error_code ret = LTTNG_OK; | |
1769 | struct lttng_dynamic_pointer_array local_events; | |
1770 | ||
1771 | lttng_dynamic_pointer_array_init(&local_events, event_list_destructor); | |
1772 | ||
1773 | /* Deserialize the events. */ | |
1774 | { | |
1775 | struct lttng_payload_view events_view = | |
1776 | lttng_payload_view_from_view(payload, 0, -1); | |
1777 | ||
1778 | ret = event_list_create_from_payload( | |
1779 | &events_view, count, &local_events); | |
1780 | if (ret != LTTNG_OK) { | |
1781 | goto end; | |
1782 | } | |
1783 | } | |
1784 | ||
1785 | ret = flatten_lttng_events(&local_events, events); | |
1786 | if (ret != LTTNG_OK) { | |
1787 | goto end; | |
1788 | } | |
1789 | ||
1790 | end: | |
1791 | lttng_dynamic_pointer_array_reset(&local_events); | |
1792 | return ret; | |
1793 | } | |
997edb99 JR |
1794 | |
1795 | static enum lttng_error_code flatten_lttng_event_fields( | |
1796 | struct lttng_dynamic_pointer_array *event_fields, | |
1797 | struct lttng_event_field **flattened_event_fields) | |
1798 | { | |
1799 | int ret, i; | |
1800 | enum lttng_error_code ret_code; | |
1801 | size_t storage_req = 0; | |
1802 | struct lttng_dynamic_buffer local_flattened_event_fields; | |
1803 | int nb_event_field; | |
1804 | ||
1805 | assert(event_fields); | |
1806 | assert(flattened_event_fields); | |
1807 | ||
1808 | lttng_dynamic_buffer_init(&local_flattened_event_fields); | |
1809 | nb_event_field = lttng_dynamic_pointer_array_get_count(event_fields); | |
1810 | ||
1811 | /* | |
1812 | * Here even if the event field contains a `struct lttng_event` that | |
1813 | * could contain dynamic data, in reality it is not the case. | |
1814 | * Dynamic data is not present. Here the flattening is mostly a direct | |
1815 | * memcpy. This is less than ideal but this code is still better than | |
1816 | * direct usage of an unpacked lttng_event_field array. | |
1817 | */ | |
1818 | storage_req += sizeof(struct lttng_event_field) * nb_event_field; | |
1819 | ||
1820 | lttng_dynamic_buffer_init(&local_flattened_event_fields); | |
1821 | ||
1822 | /* | |
1823 | * We must ensure that "local_flattened_event_fields" is never resized | |
1824 | * so as to preserve the validity of the flattened objects. | |
1825 | */ | |
1826 | ret = lttng_dynamic_buffer_set_capacity( | |
1827 | &local_flattened_event_fields, storage_req); | |
1828 | if (ret) { | |
1829 | ret_code = LTTNG_ERR_NOMEM; | |
1830 | goto end; | |
1831 | } | |
1832 | ||
1833 | for (i = 0; i < nb_event_field; i++) { | |
1834 | const struct lttng_event_field *element = | |
1835 | (const struct lttng_event_field *) | |
1836 | lttng_dynamic_pointer_array_get_pointer( | |
1837 | event_fields, i); | |
1838 | ||
1839 | if (!element) { | |
1840 | ret_code = LTTNG_ERR_FATAL; | |
1841 | goto end; | |
1842 | } | |
1843 | ret = lttng_dynamic_buffer_append(&local_flattened_event_fields, | |
1844 | element, sizeof(struct lttng_event_field)); | |
1845 | if (ret) { | |
1846 | ret_code = LTTNG_ERR_NOMEM; | |
1847 | goto end; | |
1848 | } | |
1849 | } | |
1850 | ||
1851 | /* Don't reset local_flattened_channels buffer as we return its content. */ | |
1852 | *flattened_event_fields = (struct lttng_event_field *) local_flattened_event_fields.data; | |
1853 | lttng_dynamic_buffer_init(&local_flattened_event_fields); | |
1854 | ret_code = LTTNG_OK; | |
1855 | end: | |
1856 | lttng_dynamic_buffer_reset(&local_flattened_event_fields); | |
1857 | return ret_code; | |
1858 | } | |
1859 | ||
1860 | static enum lttng_error_code event_field_list_create_from_payload( | |
1861 | struct lttng_payload_view *view, | |
1862 | unsigned int count, | |
1863 | struct lttng_dynamic_pointer_array **event_field_list) | |
1864 | { | |
1865 | enum lttng_error_code ret_code; | |
1866 | int ret, offset = 0; | |
1867 | unsigned int i; | |
1868 | struct lttng_dynamic_pointer_array *list = NULL; | |
1869 | ||
1870 | assert(view); | |
1871 | assert(event_field_list); | |
1872 | ||
1873 | list = (struct lttng_dynamic_pointer_array *) zmalloc(sizeof(*list)); | |
1874 | if (!list) { | |
1875 | ret_code = LTTNG_ERR_NOMEM; | |
1876 | goto end; | |
1877 | } | |
1878 | ||
1879 | lttng_dynamic_pointer_array_init(list, free); | |
1880 | ||
1881 | for (i = 0; i < count; i++) { | |
1882 | ssize_t event_field_size; | |
1883 | struct lttng_event_field *field = NULL; | |
1884 | struct lttng_payload_view event_field_view = | |
1885 | lttng_payload_view_from_view(view, offset, -1); | |
1886 | ||
1887 | event_field_size = lttng_event_field_create_from_payload( | |
1888 | &event_field_view, &field); | |
1889 | if (event_field_size < 0) { | |
1890 | ret_code = LTTNG_ERR_INVALID; | |
1891 | goto end; | |
1892 | } | |
1893 | ||
1894 | /* Lifetime and management of the object is now bound to the array. */ | |
1895 | ret = lttng_dynamic_pointer_array_add_pointer(list, field); | |
1896 | if (ret) { | |
1897 | free(field); | |
1898 | ret_code = LTTNG_ERR_NOMEM; | |
1899 | goto end; | |
1900 | } | |
1901 | ||
1902 | offset += event_field_size; | |
1903 | } | |
1904 | ||
1905 | if (view->buffer.size != offset) { | |
1906 | ret_code = LTTNG_ERR_INVALID; | |
1907 | goto end; | |
1908 | } | |
1909 | ||
1910 | *event_field_list = list; | |
1911 | list = NULL; | |
1912 | ret_code = LTTNG_OK; | |
1913 | ||
1914 | end: | |
1915 | if (list) { | |
1916 | lttng_dynamic_pointer_array_reset(list); | |
1917 | free(list); | |
1918 | } | |
1919 | ||
1920 | return ret_code; | |
1921 | } | |
1922 | ||
1923 | enum lttng_error_code lttng_event_fields_create_and_flatten_from_payload( | |
1924 | struct lttng_payload_view *view, | |
1925 | unsigned int count, | |
1926 | struct lttng_event_field **fields) | |
1927 | { | |
1928 | enum lttng_error_code ret_code; | |
1929 | struct lttng_dynamic_pointer_array *local_event_fields = NULL; | |
1930 | ||
1931 | ret_code = event_field_list_create_from_payload( | |
1932 | view, count, &local_event_fields); | |
1933 | if (ret_code != LTTNG_OK) { | |
1934 | goto end; | |
1935 | } | |
1936 | ||
1937 | ret_code = flatten_lttng_event_fields(local_event_fields, fields); | |
1938 | if (ret_code != LTTNG_OK) { | |
1939 | goto end; | |
1940 | } | |
1941 | end: | |
1942 | if (local_event_fields) { | |
1943 | lttng_dynamic_pointer_array_reset(local_event_fields); | |
1944 | free(local_event_fields); | |
1945 | } | |
1946 | ||
1947 | return ret_code; | |
1948 | } |