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 | ||
166fc586 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> |
166fc586 JR |
16 | #include <common/sessiond-comm/sessiond-comm.h> |
17 | #include <lttng/constant.h> | |
18 | #include <lttng/event-internal.h> | |
19 | #include <lttng/event.h> | |
20 | #include <lttng/userspace-probe-internal.h> | |
21 | #include <stdint.h> | |
22 | #include <string.h> | |
23 | ||
24 | struct event_list_element { | |
25 | struct lttng_event *event; | |
26 | struct lttng_event_exclusion *exclusions; | |
27 | char *filter_expression; | |
28 | }; | |
29 | ||
30 | static void event_list_destructor(void *ptr) | |
31 | { | |
32 | struct event_list_element *element = (struct event_list_element *) ptr; | |
33 | ||
34 | free(element->filter_expression); | |
35 | free(element->exclusions); | |
36 | lttng_event_destroy(element->event); | |
37 | free(element); | |
38 | } | |
76fcf151 JG |
39 | |
40 | LTTNG_HIDDEN | |
41 | struct lttng_event *lttng_event_copy(const struct lttng_event *event) | |
42 | { | |
43 | struct lttng_event *new_event; | |
44 | struct lttng_event_extended *new_event_extended; | |
45 | ||
46 | new_event = zmalloc(sizeof(*event)); | |
47 | if (!new_event) { | |
48 | PERROR("Error allocating event structure"); | |
49 | goto end; | |
50 | } | |
51 | ||
52 | /* Copy the content of the old event. */ | |
53 | memcpy(new_event, event, sizeof(*event)); | |
54 | ||
55 | /* | |
56 | * We need to create a new extended since the previous pointer is now | |
57 | * invalid. | |
58 | */ | |
59 | new_event_extended = zmalloc(sizeof(*new_event_extended)); | |
60 | if (!new_event_extended) { | |
61 | PERROR("Error allocating event extended structure"); | |
62 | goto error; | |
63 | } | |
64 | ||
65 | new_event->extended.ptr = new_event_extended; | |
66 | end: | |
67 | return new_event; | |
68 | error: | |
69 | free(new_event); | |
37750a61 | 70 | new_event = NULL; |
76fcf151 JG |
71 | goto end; |
72 | } | |
166fc586 JR |
73 | |
74 | static int lttng_event_probe_attr_serialize( | |
75 | const struct lttng_event_probe_attr *probe, | |
76 | struct lttng_dynamic_buffer *buf) | |
77 | { | |
78 | int ret; | |
79 | size_t symbol_name_len; | |
80 | struct lttng_event_probe_attr_comm comm = { 0 }; | |
81 | ||
82 | symbol_name_len = lttng_strnlen(probe->symbol_name, LTTNG_SYMBOL_NAME_LEN); | |
83 | if (symbol_name_len == LTTNG_SYMBOL_NAME_LEN) { | |
84 | /* Not null-termintated. */ | |
85 | ret = -1; | |
86 | goto end; | |
87 | } | |
88 | ||
89 | /* Include the null terminator. */ | |
90 | symbol_name_len += 1; | |
91 | ||
92 | comm.symbol_name_len = (uint32_t) symbol_name_len; | |
93 | comm.addr = probe->addr; | |
94 | comm.offset = probe->addr; | |
95 | ||
96 | ret = lttng_dynamic_buffer_append(buf, &comm, sizeof(comm)); | |
97 | if (ret < 0) { | |
98 | ret = -1; | |
99 | goto end; | |
100 | } | |
101 | ||
102 | ret = lttng_dynamic_buffer_append(buf, probe->symbol_name, symbol_name_len); | |
103 | ||
104 | end: | |
105 | return ret; | |
106 | } | |
107 | ||
108 | static int lttng_event_function_attr_serialize( | |
109 | const struct lttng_event_function_attr *function, | |
110 | struct lttng_dynamic_buffer *buf) | |
111 | { | |
112 | int ret; | |
113 | size_t symbol_name_len; | |
114 | struct lttng_event_function_attr_comm comm = { 0 }; | |
115 | ||
116 | symbol_name_len = lttng_strnlen(function->symbol_name, LTTNG_SYMBOL_NAME_LEN); | |
117 | if (symbol_name_len == LTTNG_SYMBOL_NAME_LEN) { | |
118 | /* Not null-termintated. */ | |
119 | ret = -1; | |
120 | goto end; | |
121 | } | |
122 | ||
123 | /* Include the null terminator. */ | |
124 | symbol_name_len += 1; | |
125 | ||
126 | comm.symbol_name_len = (uint32_t) symbol_name_len; | |
127 | ||
128 | ret = lttng_dynamic_buffer_append(buf, &comm, sizeof(comm)); | |
129 | if (ret < 0) { | |
130 | ret = -1; | |
131 | goto end; | |
132 | } | |
133 | ||
134 | ret = lttng_dynamic_buffer_append(buf, function->symbol_name, symbol_name_len); | |
135 | end: | |
136 | return ret; | |
137 | } | |
138 | ||
139 | static ssize_t lttng_event_probe_attr_create_from_buffer( | |
140 | const struct lttng_buffer_view *view, | |
141 | struct lttng_event_probe_attr **probe_attr) | |
142 | { | |
143 | ssize_t ret, offset = 0; | |
144 | const struct lttng_event_probe_attr_comm *comm; | |
145 | struct lttng_event_probe_attr *local_attr = NULL; | |
146 | const struct lttng_buffer_view comm_view = lttng_buffer_view_from_view( | |
147 | view, offset, sizeof(*comm)); | |
148 | ||
149 | if (!lttng_buffer_view_is_valid(&comm_view)) { | |
150 | ret = -1; | |
151 | goto end; | |
152 | } | |
153 | ||
154 | comm = (typeof(comm)) view->data; | |
155 | offset += sizeof(*comm); | |
156 | ||
157 | local_attr = zmalloc(sizeof(*local_attr)); | |
158 | if (local_attr == NULL) { | |
159 | ret = -1; | |
160 | goto end; | |
161 | } | |
162 | ||
163 | local_attr->addr = comm->addr; | |
164 | local_attr->offset = comm->offset; | |
165 | ||
166 | { | |
167 | const char *name; | |
168 | const struct lttng_buffer_view name_view = | |
169 | lttng_buffer_view_from_view(view, offset, | |
170 | comm->symbol_name_len); | |
171 | if (!lttng_buffer_view_is_valid(&name_view)) { | |
172 | ret = -1; | |
173 | goto end; | |
174 | } | |
175 | ||
176 | name = name_view.data; | |
177 | ||
178 | if (!lttng_buffer_view_contains_string( | |
179 | &name_view, name, comm->symbol_name_len)) { | |
180 | ret = -1; | |
181 | goto end; | |
182 | } | |
183 | ||
184 | ret = lttng_strncpy(local_attr->symbol_name, name, | |
185 | LTTNG_SYMBOL_NAME_LEN); | |
186 | if (ret) { | |
187 | ret = -1; | |
188 | goto end; | |
189 | } | |
190 | offset += comm->symbol_name_len; | |
191 | } | |
192 | ||
193 | *probe_attr = local_attr; | |
194 | local_attr = NULL; | |
195 | ret = offset; | |
196 | end: | |
197 | return ret; | |
198 | } | |
199 | ||
200 | static ssize_t lttng_event_function_attr_create_from_buffer( | |
201 | const struct lttng_buffer_view *view, | |
202 | struct lttng_event_function_attr **function_attr) | |
203 | { | |
204 | ssize_t ret, offset = 0; | |
205 | const struct lttng_event_function_attr_comm *comm; | |
206 | struct lttng_event_function_attr *local_attr = NULL; | |
207 | const struct lttng_buffer_view comm_view = lttng_buffer_view_from_view( | |
208 | view, offset, sizeof(*comm)); | |
209 | ||
210 | if (!lttng_buffer_view_is_valid(&comm_view)) { | |
211 | ret = -1; | |
212 | goto end; | |
213 | } | |
214 | ||
215 | comm = (typeof(comm)) view->data; | |
216 | offset += sizeof(*comm); | |
217 | ||
218 | local_attr = zmalloc(sizeof(*local_attr)); | |
219 | if (local_attr == NULL) { | |
220 | ret = -1; | |
221 | goto end; | |
222 | } | |
223 | ||
224 | { | |
225 | const char *name; | |
226 | const struct lttng_buffer_view name_view = | |
227 | lttng_buffer_view_from_view(view, offset, | |
228 | comm->symbol_name_len); | |
229 | if (!lttng_buffer_view_is_valid(&name_view)) { | |
230 | ret = -1; | |
231 | goto end; | |
232 | } | |
233 | ||
234 | name = name_view.data; | |
235 | ||
236 | if (!lttng_buffer_view_contains_string( | |
237 | &name_view, name, comm->symbol_name_len)) { | |
238 | ret = -1; | |
239 | goto end; | |
240 | } | |
241 | ||
242 | ret = lttng_strncpy(local_attr->symbol_name, name, | |
243 | LTTNG_SYMBOL_NAME_LEN); | |
244 | if (ret) { | |
245 | ret = -1; | |
246 | goto end; | |
247 | } | |
248 | offset += comm->symbol_name_len; | |
249 | } | |
250 | ||
251 | *function_attr = local_attr; | |
252 | local_attr = NULL; | |
253 | ret = offset; | |
254 | end: | |
255 | return ret; | |
256 | } | |
257 | ||
258 | static ssize_t lttng_event_exclusions_create_from_buffer(const struct lttng_buffer_view *view, | |
259 | uint32_t count, struct lttng_event_exclusion **exclusions) | |
260 | { | |
261 | ssize_t ret, offset = 0; | |
262 | size_t size = (count * LTTNG_SYMBOL_NAME_LEN); | |
263 | uint32_t i; | |
264 | const struct lttng_event_exclusion_comm *comm; | |
265 | struct lttng_event_exclusion *local_exclusions; | |
266 | ||
267 | ||
268 | local_exclusions = zmalloc(sizeof(struct lttng_event_exclusion) + size); | |
269 | if (!local_exclusions) { | |
270 | ret = -1; | |
271 | goto end; | |
272 | } | |
273 | local_exclusions->count = count; | |
274 | ||
275 | for (i = 0; i < count; i++) { | |
276 | const char *string; | |
277 | struct lttng_buffer_view string_view; | |
278 | const struct lttng_buffer_view comm_view = | |
279 | lttng_buffer_view_from_view( | |
280 | view, offset, sizeof(*comm)); | |
281 | ||
282 | if (!lttng_buffer_view_is_valid(&comm_view)) { | |
283 | ret = -1; | |
284 | goto end; | |
285 | } | |
286 | ||
287 | comm = (typeof(comm)) comm_view.data; | |
288 | offset += sizeof(*comm); | |
289 | ||
290 | string_view = lttng_buffer_view_from_view( | |
291 | view, offset, comm->len); | |
292 | ||
293 | if (!lttng_buffer_view_is_valid(&string_view)) { | |
294 | ret = -1; | |
295 | goto end; | |
296 | } | |
297 | ||
298 | string = string_view.data; | |
299 | ||
300 | if (!lttng_buffer_view_contains_string( | |
301 | &string_view, string, comm->len)) { | |
302 | ret = -1; | |
303 | goto end; | |
304 | } | |
305 | ||
306 | ret = lttng_strncpy( | |
307 | local_exclusions->names[i], | |
308 | string, comm->len); | |
309 | if (ret) { | |
310 | ret = -1; | |
311 | goto end; | |
312 | } | |
313 | offset += comm->len; | |
314 | } | |
315 | ||
316 | *exclusions = local_exclusions; | |
317 | local_exclusions = NULL; | |
318 | ret = offset; | |
319 | end: | |
320 | free(local_exclusions); | |
321 | return ret; | |
322 | } | |
323 | ||
324 | ||
325 | LTTNG_HIDDEN | |
326 | ssize_t lttng_event_create_from_buffer(const struct lttng_buffer_view *view, | |
327 | struct lttng_event **event, | |
328 | struct lttng_event_exclusion **exclusion, | |
329 | char **filter_expression, | |
330 | struct lttng_filter_bytecode **bytecode, | |
331 | int sock) | |
332 | { | |
333 | ssize_t ret, offset = 0; | |
334 | struct lttng_event *local_event = NULL; | |
335 | struct lttng_event_exclusion *local_exclusions = NULL; | |
336 | struct lttng_filter_bytecode *local_bytecode = NULL; | |
337 | char *local_filter_expression = NULL; | |
338 | const struct lttng_event_comm *event_comm; | |
339 | struct lttng_event_function_attr *local_function_attr = NULL; | |
340 | struct lttng_event_probe_attr *local_probe_attr = NULL; | |
341 | struct lttng_userspace_probe_location *local_userspace_probe_location = | |
342 | NULL; | |
343 | int received_fd = -1; | |
344 | ||
345 | /* | |
346 | * Only event is obligatory, the other output argument are optional and | |
347 | * depends on what the caller is interested in. | |
348 | */ | |
349 | assert(event); | |
350 | assert(view); | |
351 | ||
352 | { | |
353 | const struct lttng_buffer_view comm_view = | |
354 | lttng_buffer_view_from_view(view, offset, | |
355 | sizeof(*event_comm)); | |
356 | ||
357 | if (!lttng_buffer_view_is_valid(&comm_view)) { | |
358 | ret = -1; | |
359 | goto end; | |
360 | } | |
361 | ||
362 | /* lttng_event_comm header */ | |
363 | event_comm = (typeof(event_comm)) comm_view.data; | |
364 | offset += sizeof(*event_comm); | |
365 | } | |
366 | ||
367 | local_event = lttng_event_create(); | |
368 | if (local_event == NULL) { | |
369 | ret = -1; | |
370 | goto end; | |
371 | } | |
372 | ||
373 | local_event->type = event_comm->event_type; | |
374 | local_event->loglevel_type = event_comm->loglevel_type; | |
375 | local_event->loglevel = event_comm->loglevel; | |
376 | local_event->enabled = event_comm->enabled; | |
377 | local_event->pid = event_comm->pid; | |
378 | local_event->flags = event_comm->flags; | |
379 | ||
380 | { | |
381 | const char *name; | |
382 | const struct lttng_buffer_view name_view = | |
383 | lttng_buffer_view_from_view(view, offset, | |
384 | event_comm->name_len); | |
385 | if (!lttng_buffer_view_is_valid(&name_view)) { | |
386 | ret = -1; | |
387 | goto end; | |
388 | } | |
389 | ||
390 | name = name_view.data; | |
391 | ||
392 | if (!lttng_buffer_view_contains_string( | |
393 | &name_view, name, event_comm->name_len)) { | |
394 | ret = -1; | |
395 | goto end; | |
396 | } | |
397 | ||
398 | ret = lttng_strncpy( | |
399 | local_event->name, name, LTTNG_SYMBOL_NAME_LEN); | |
400 | if (ret) { | |
401 | ret = -1; | |
402 | goto end; | |
403 | } | |
404 | offset += event_comm->name_len; | |
405 | } | |
406 | ||
407 | /* Exclusions */ | |
408 | if (event_comm->exclusion_count == 0) { | |
409 | goto deserialize_filter_expression; | |
410 | } | |
411 | ||
412 | { | |
413 | ||
414 | const struct lttng_buffer_view exclusions_view = | |
415 | lttng_buffer_view_from_view( | |
416 | view, offset, -1); | |
417 | ||
418 | if (!lttng_buffer_view_is_valid(&exclusions_view)) { | |
419 | ret = -1; | |
420 | goto end; | |
421 | } | |
422 | ||
423 | ret = lttng_event_exclusions_create_from_buffer(&exclusions_view, | |
424 | event_comm->exclusion_count, &local_exclusions); | |
425 | if (ret < 0) { | |
426 | ret = -1; | |
427 | goto end; | |
428 | } | |
429 | offset += ret; | |
430 | ||
431 | local_event->exclusion = 1; | |
432 | } | |
433 | ||
434 | deserialize_filter_expression: | |
435 | ||
436 | if (event_comm->filter_expression_len == 0) { | |
437 | if (event_comm->bytecode_len != 0) { | |
438 | /* | |
439 | * This is an invalid event payload. | |
440 | * | |
441 | * Filter expression without bytecode is possible but | |
442 | * not the other way around. | |
443 | * */ | |
444 | ret = -1; | |
445 | goto end; | |
446 | } | |
447 | goto deserialize_event_type_payload; | |
448 | } | |
449 | ||
450 | { | |
451 | const char *filter_expression_buffer; | |
452 | const struct lttng_buffer_view filter_expression_view = | |
453 | lttng_buffer_view_from_view(view, offset, | |
454 | event_comm->filter_expression_len); | |
455 | ||
456 | if (!lttng_buffer_view_is_valid(&filter_expression_view)) { | |
457 | ret = -1; | |
458 | goto end; | |
459 | } | |
460 | ||
461 | filter_expression_buffer = filter_expression_view.data; | |
462 | ||
463 | if (!lttng_buffer_view_contains_string(&filter_expression_view, | |
464 | filter_expression_buffer, | |
465 | event_comm->filter_expression_len)) { | |
466 | ret = -1; | |
467 | goto end; | |
468 | } | |
469 | ||
470 | local_filter_expression = lttng_strndup( | |
471 | filter_expression_buffer, | |
472 | event_comm->filter_expression_len); | |
473 | if (!local_filter_expression) { | |
474 | ret = -1; | |
475 | goto end; | |
476 | } | |
477 | ||
478 | local_event->filter = 1; | |
479 | ||
480 | offset += event_comm->filter_expression_len; | |
481 | } | |
482 | ||
483 | if (event_comm->bytecode_len == 0) { | |
484 | /* | |
485 | * Filter expression can be present but without bytecode | |
486 | * when dealing with event listing. | |
487 | */ | |
488 | goto deserialize_event_type_payload; | |
489 | } | |
490 | ||
491 | /* Bytecode */ | |
492 | { | |
493 | const struct lttng_buffer_view bytecode_view = | |
494 | lttng_buffer_view_from_view(view, offset, | |
495 | event_comm->bytecode_len); | |
496 | ||
497 | if (!lttng_buffer_view_is_valid(&bytecode_view)) { | |
498 | ret = -1; | |
499 | goto end; | |
500 | } | |
501 | ||
502 | local_bytecode = zmalloc(event_comm->bytecode_len); | |
503 | if (!local_bytecode) { | |
504 | ret = -1; | |
505 | goto end; | |
506 | } | |
507 | ||
508 | memcpy(local_bytecode, bytecode_view.data, | |
509 | event_comm->bytecode_len); | |
510 | if ((local_bytecode->len + sizeof(*local_bytecode)) != | |
511 | event_comm->bytecode_len) { | |
512 | ret = -1; | |
513 | goto end; | |
514 | } | |
515 | ||
516 | offset += event_comm->bytecode_len; | |
517 | } | |
518 | ||
519 | deserialize_event_type_payload: | |
520 | /* Event type specific payload */ | |
521 | switch (local_event->type) { | |
522 | case LTTNG_EVENT_FUNCTION: | |
523 | /* Fallthrough */ | |
524 | case LTTNG_EVENT_PROBE: | |
525 | { | |
526 | const struct lttng_buffer_view probe_attr_view = | |
527 | lttng_buffer_view_from_view(view, offset, | |
528 | event_comm->lttng_event_probe_attr_len); | |
529 | ||
530 | if (event_comm->lttng_event_probe_attr_len == 0) { | |
531 | ret = -1; | |
532 | goto end; | |
533 | } | |
534 | ||
535 | if (!lttng_buffer_view_is_valid(&probe_attr_view)) { | |
536 | ret = -1; | |
537 | goto end; | |
538 | } | |
539 | ||
540 | ret = lttng_event_probe_attr_create_from_buffer( | |
541 | &probe_attr_view, &local_probe_attr); | |
542 | if (ret < 0 || ret != event_comm->lttng_event_probe_attr_len) { | |
543 | ret = -1; | |
544 | goto end; | |
545 | } | |
546 | ||
547 | /* Copy to the local event. */ | |
548 | memcpy(&local_event->attr.probe, local_probe_attr, | |
549 | sizeof(local_event->attr.probe)); | |
550 | ||
551 | offset += ret; | |
552 | break; | |
553 | } | |
554 | case LTTNG_EVENT_FUNCTION_ENTRY: | |
555 | { | |
556 | const struct lttng_buffer_view function_attr_view = | |
557 | lttng_buffer_view_from_view(view, offset, | |
558 | event_comm->lttng_event_function_attr_len); | |
559 | ||
560 | if (event_comm->lttng_event_function_attr_len == 0) { | |
561 | ret = -1; | |
562 | goto end; | |
563 | } | |
564 | ||
565 | if (!lttng_buffer_view_is_valid(&function_attr_view)) { | |
566 | ret = -1; | |
567 | goto end; | |
568 | } | |
569 | ||
570 | ret = lttng_event_function_attr_create_from_buffer( | |
571 | &function_attr_view, &local_function_attr); | |
572 | if (ret < 0 || ret != event_comm->lttng_event_function_attr_len) { | |
573 | ret = -1; | |
574 | goto end; | |
575 | } | |
576 | ||
577 | /* Copy to the local event. */ | |
578 | memcpy(&local_event->attr.ftrace, local_function_attr, | |
579 | sizeof(local_event->attr.ftrace)); | |
580 | ||
581 | offset += ret; | |
582 | ||
583 | break; | |
584 | } | |
585 | case LTTNG_EVENT_USERSPACE_PROBE: | |
586 | { | |
587 | const struct lttng_buffer_view userspace_probe_location_view = | |
588 | lttng_buffer_view_from_view(view, offset, | |
589 | event_comm->userspace_probe_location_len); | |
590 | const struct lttng_userspace_probe_location_lookup_method | |
591 | *lookup = NULL; | |
592 | ||
593 | if (event_comm->userspace_probe_location_len == 0) { | |
594 | ret = -1; | |
595 | goto end; | |
596 | } | |
597 | ||
598 | if (!lttng_buffer_view_is_valid( | |
599 | &userspace_probe_location_view)) { | |
600 | ret = -1; | |
601 | goto end; | |
602 | } | |
603 | ||
604 | ret = lttng_userspace_probe_location_create_from_buffer( | |
605 | &userspace_probe_location_view, | |
606 | &local_userspace_probe_location); | |
607 | if (ret < 0) { | |
608 | WARN("Failed to create a userspace probe location from the received buffer"); | |
609 | ret = -1; | |
610 | goto end; | |
611 | } | |
612 | ||
613 | if (ret != event_comm->userspace_probe_location_len) { | |
614 | WARN("Userspace probe location from the received buffer is not the advertised length: header length = %" PRIu32 ", payload length = %lu", event_comm->userspace_probe_location_len, ret); | |
615 | ret = -1; | |
616 | goto end; | |
617 | } | |
618 | ||
619 | if (sock < 0) { | |
620 | /* | |
621 | * The userspace FD is simply not sent and we do not | |
622 | * care about it. This happens on listing. | |
623 | */ | |
624 | goto attach_userspace_probe_to_event; | |
625 | } | |
626 | ||
627 | /* | |
628 | * Receive the file descriptor to the target binary from the | |
629 | * client. | |
630 | */ | |
631 | DBG("Receiving userspace probe target FD from client ..."); | |
632 | ret = lttcomm_recv_fds_unix_sock(sock, &received_fd, 1); | |
633 | if (ret <= 0) { | |
634 | DBG("Nothing recv() from client userspace probe fd... continuing"); | |
635 | ret = -1; | |
636 | goto end; | |
637 | } | |
638 | /* | |
639 | * Set the file descriptor received from the client through the | |
640 | * unix socket in the probe location. | |
641 | */ | |
642 | lookup = lttng_userspace_probe_location_get_lookup_method( | |
643 | local_userspace_probe_location); | |
644 | if (!lookup) { | |
645 | ret = LTTNG_ERR_PROBE_LOCATION_INVAL; | |
646 | goto end; | |
647 | } | |
648 | ||
649 | /* | |
650 | * From the kernel tracer's perspective, all userspace probe | |
651 | * event types are all the same: a file and an offset. | |
652 | */ | |
653 | switch (lttng_userspace_probe_location_lookup_method_get_type( | |
654 | lookup)) { | |
655 | case LTTNG_USERSPACE_PROBE_LOCATION_LOOKUP_METHOD_TYPE_FUNCTION_ELF: | |
656 | ret = lttng_userspace_probe_location_function_set_binary_fd( | |
657 | local_userspace_probe_location, | |
658 | received_fd); | |
659 | break; | |
660 | case LTTNG_USERSPACE_PROBE_LOCATION_LOOKUP_METHOD_TYPE_TRACEPOINT_SDT: | |
661 | ret = lttng_userspace_probe_location_tracepoint_set_binary_fd( | |
662 | local_userspace_probe_location, | |
663 | received_fd); | |
664 | break; | |
665 | default: | |
666 | ret = LTTNG_ERR_PROBE_LOCATION_INVAL; | |
667 | goto end; | |
668 | } | |
669 | ||
670 | if (ret) { | |
671 | ret = LTTNG_ERR_PROBE_LOCATION_INVAL; | |
672 | goto end; | |
673 | } | |
674 | ||
675 | /* Fd transfered to the object. */ | |
676 | received_fd = -1; | |
677 | ||
678 | attach_userspace_probe_to_event: | |
679 | ||
680 | /* Attach the probe location to the event. */ | |
681 | ret = lttng_event_set_userspace_probe_location( | |
682 | local_event, local_userspace_probe_location); | |
683 | if (ret) { | |
684 | ret = LTTNG_ERR_PROBE_LOCATION_INVAL; | |
685 | goto end; | |
686 | } | |
687 | ||
688 | /* | |
689 | * Userspace probe location object ownership transfered to the | |
690 | * event object | |
691 | */ | |
692 | local_userspace_probe_location = NULL; | |
693 | offset += event_comm->userspace_probe_location_len; | |
694 | break; | |
695 | } | |
696 | case LTTNG_EVENT_TRACEPOINT: | |
697 | /* Fallthrough */ | |
698 | case LTTNG_EVENT_ALL: | |
699 | /* Fallthrough */ | |
700 | case LTTNG_EVENT_SYSCALL: | |
701 | /* Fallthrough */ | |
702 | case LTTNG_EVENT_NOOP: | |
703 | /* Nothing to do here */ | |
704 | break; | |
705 | default: | |
706 | ret = LTTNG_ERR_UND; | |
707 | goto end; | |
708 | break; | |
709 | } | |
710 | ||
711 | /* Transfer ownership to the caller. */ | |
712 | *event = local_event; | |
713 | local_event = NULL; | |
714 | ||
715 | if (bytecode) { | |
716 | *bytecode = local_bytecode; | |
717 | local_bytecode = NULL; | |
718 | } | |
719 | ||
720 | if (exclusion) { | |
721 | *exclusion = local_exclusions; | |
722 | local_exclusions = NULL; | |
723 | } | |
724 | ||
725 | if (filter_expression) { | |
726 | *filter_expression = local_filter_expression; | |
727 | local_filter_expression = NULL; | |
728 | } | |
729 | ||
730 | ret = offset; | |
731 | end: | |
732 | lttng_event_destroy(local_event); | |
733 | lttng_userspace_probe_location_destroy(local_userspace_probe_location); | |
734 | free(local_filter_expression); | |
735 | free(local_exclusions); | |
736 | free(local_bytecode); | |
737 | free(local_function_attr); | |
738 | free(local_probe_attr); | |
739 | if (received_fd > -1) { | |
740 | if (close(received_fd)) { | |
741 | PERROR("Failed to close received fd"); | |
742 | }; | |
743 | } | |
744 | return ret; | |
745 | } | |
746 | ||
747 | LTTNG_HIDDEN | |
748 | int lttng_event_serialize(const struct lttng_event *event, | |
749 | unsigned int exclusion_count, | |
750 | char **exclusion_list, | |
751 | char *filter_expression, | |
752 | size_t bytecode_len, | |
753 | void *bytecode, | |
754 | struct lttng_dynamic_buffer *buf, | |
755 | int *fd_to_send) | |
756 | { | |
757 | int ret; | |
758 | unsigned int i; | |
759 | size_t header_offset, size_before_payload; | |
760 | size_t name_len; | |
761 | struct lttng_event_comm event_comm = { 0 }; | |
762 | struct lttng_event_comm *header; | |
763 | ||
764 | assert(event); | |
765 | assert(buf); | |
766 | ||
767 | /* Save the header location for later in-place header update. */ | |
768 | header_offset = buf->size; | |
769 | ||
770 | name_len = lttng_strnlen(event->name, LTTNG_SYMBOL_NAME_LEN); | |
771 | if (name_len == LTTNG_SYMBOL_NAME_LEN) { | |
772 | /* Event name is not NULL-terminated. */ | |
773 | ret = -1; | |
774 | goto end; | |
775 | } | |
776 | ||
777 | /* Add null termination. */ | |
778 | name_len += 1; | |
779 | ||
780 | if (exclusion_count > UINT32_MAX) { | |
781 | /* Possible overflow. */ | |
782 | ret = -1; | |
783 | goto end; | |
784 | } | |
785 | ||
786 | if (bytecode_len > UINT32_MAX) { | |
787 | /* Possible overflow. */ | |
788 | ret = -1; | |
789 | goto end; | |
790 | } | |
791 | ||
792 | event_comm.name_len = (uint32_t) name_len; | |
793 | event_comm.event_type = (int8_t) event->type; | |
794 | event_comm.loglevel_type = (int8_t) event->loglevel_type; | |
795 | event_comm.loglevel = (int32_t) event->loglevel; | |
796 | event_comm.enabled = (int8_t) event->enabled; | |
797 | event_comm.pid = (int32_t) event->pid; | |
798 | event_comm.exclusion_count = (uint32_t) exclusion_count; | |
799 | event_comm.bytecode_len = (uint32_t) bytecode_len; | |
800 | event_comm.flags = (int32_t) event->flags; | |
801 | ||
802 | if (filter_expression) { | |
803 | event_comm.filter_expression_len = | |
804 | strlen(filter_expression) + 1; | |
805 | } | |
806 | ||
807 | /* Header */ | |
808 | ret = lttng_dynamic_buffer_append(buf, &event_comm, sizeof(event_comm)); | |
809 | if (ret) { | |
810 | goto end; | |
811 | } | |
812 | ||
813 | /* Event name */ | |
814 | ret = lttng_dynamic_buffer_append(buf, event->name, name_len); | |
815 | if (ret) { | |
816 | goto end; | |
817 | } | |
818 | ||
819 | /* Exclusions */ | |
820 | for (i = 0; i < exclusion_count; i++) { | |
821 | size_t exclusion_len; | |
822 | struct lttng_event_exclusion_comm exclusion_comm = { 0 }; | |
823 | ||
824 | assert(exclusion_list); | |
825 | ||
826 | exclusion_len = lttng_strnlen( | |
827 | *(exclusion_list + i), LTTNG_SYMBOL_NAME_LEN); | |
828 | if (exclusion_len == LTTNG_SYMBOL_NAME_LEN) { | |
829 | /* Exclusion is not NULL-terminated. */ | |
830 | ret = -1; | |
831 | goto end; | |
832 | } | |
833 | ||
834 | /* Include null terminator '\0'. */ | |
835 | exclusion_len += 1; | |
836 | ||
837 | exclusion_comm.len = exclusion_len; | |
838 | ||
839 | ret = lttng_dynamic_buffer_append(buf, &exclusion_comm, sizeof(exclusion_comm)); | |
840 | if (ret) { | |
841 | goto end; | |
842 | } | |
843 | ||
844 | ret = lttng_dynamic_buffer_append(buf, *(exclusion_list + i), | |
845 | exclusion_len); | |
846 | if (ret) { | |
847 | goto end; | |
848 | } | |
849 | } | |
850 | ||
851 | /* Filter expression and its bytecode */ | |
852 | if (filter_expression) { | |
853 | ret = lttng_dynamic_buffer_append(buf, filter_expression, | |
854 | event_comm.filter_expression_len); | |
855 | if (ret) { | |
856 | goto end; | |
857 | } | |
858 | ||
859 | /* | |
860 | * Bytecode can be absent when we serialize to the client | |
861 | * for listing. | |
862 | */ | |
863 | if (bytecode) { | |
864 | ret = lttng_dynamic_buffer_append( | |
865 | buf, bytecode, bytecode_len); | |
866 | if (ret) { | |
867 | goto end; | |
868 | } | |
869 | } | |
870 | } | |
871 | ||
872 | size_before_payload = buf->size; | |
873 | ||
874 | /* Event type specific payload */ | |
875 | switch (event->type) { | |
876 | case LTTNG_EVENT_FUNCTION: | |
877 | /* Fallthrough */ | |
878 | case LTTNG_EVENT_PROBE: | |
879 | ret = lttng_event_probe_attr_serialize(&event->attr.probe, buf); | |
880 | if (ret) { | |
881 | ret = -1; | |
882 | goto end; | |
883 | } | |
884 | ||
885 | header = (struct lttng_event_comm *) ((char *) buf->data + | |
886 | header_offset); | |
887 | header->lttng_event_probe_attr_len = | |
888 | buf->size - size_before_payload; | |
889 | ||
890 | break; | |
891 | case LTTNG_EVENT_FUNCTION_ENTRY: | |
892 | ret = lttng_event_function_attr_serialize( | |
893 | &event->attr.ftrace, buf); | |
894 | if (ret) { | |
895 | ret = -1; | |
896 | goto end; | |
897 | } | |
898 | ||
899 | /* Update the lttng_event_function_attr len. */ | |
900 | header = (struct lttng_event_comm *) ((char *) buf->data + | |
901 | header_offset); | |
902 | header->lttng_event_function_attr_len = | |
903 | buf->size - size_before_payload; | |
904 | ||
905 | break; | |
906 | case LTTNG_EVENT_USERSPACE_PROBE: | |
907 | { | |
908 | struct lttng_event_extended *ev_ext = | |
909 | (struct lttng_event_extended *) | |
910 | event->extended.ptr; | |
911 | assert(event->extended.ptr); | |
912 | assert(ev_ext->probe_location); | |
913 | ||
914 | size_before_payload = buf->size; | |
915 | if (ev_ext->probe_location) { | |
916 | /* | |
917 | * lttng_userspace_probe_location_serialize returns the | |
918 | * number of bytes that were appended to the buffer. | |
919 | */ | |
920 | ret = lttng_userspace_probe_location_serialize( | |
921 | ev_ext->probe_location, buf, | |
922 | fd_to_send); | |
923 | if (ret < 0) { | |
924 | goto end; | |
925 | } | |
926 | ret = 0; | |
927 | ||
928 | /* Update the userspace probe location len. */ | |
929 | header = (struct lttng_event_comm *) ((char *) buf->data + | |
930 | header_offset); | |
931 | header->userspace_probe_location_len = | |
932 | buf->size - size_before_payload; | |
933 | } | |
934 | break; | |
935 | } | |
936 | case LTTNG_EVENT_TRACEPOINT: | |
937 | /* Fallthrough */ | |
938 | case LTTNG_EVENT_ALL: | |
939 | /* Fallthrough */ | |
940 | default: | |
941 | /* Nothing to do here */ | |
942 | break; | |
943 | } | |
944 | ||
945 | end: | |
946 | return ret; | |
947 | } | |
948 | ||
b583ad83 JR |
949 | static ssize_t lttng_event_context_app_populate_from_buffer( |
950 | const struct lttng_buffer_view *view, | |
951 | struct lttng_event_context *event_ctx) | |
952 | { | |
953 | ssize_t ret, offset = 0; | |
954 | const struct lttng_event_context_app_comm *comm; | |
955 | char *provider_name = NULL, *context_name = NULL; | |
956 | size_t provider_name_len, context_name_len; | |
957 | const struct lttng_buffer_view comm_view = lttng_buffer_view_from_view( | |
958 | view, offset, sizeof(*comm)); | |
959 | ||
960 | assert(event_ctx->ctx == LTTNG_EVENT_CONTEXT_APP_CONTEXT); | |
961 | ||
962 | if (!lttng_buffer_view_is_valid(&comm_view)) { | |
963 | ret = -1; | |
964 | goto end; | |
965 | } | |
966 | ||
967 | comm = (typeof(comm)) comm_view.data; | |
968 | offset += sizeof(*comm); | |
969 | ||
970 | provider_name_len = comm->provider_name_len; | |
971 | context_name_len = comm->ctx_name_len; | |
972 | ||
973 | if (provider_name_len == 0 || context_name_len == 0) { | |
974 | /* | |
975 | * Application provider and context names MUST | |
976 | * be provided. | |
977 | */ | |
978 | ret = -1; | |
979 | goto end; | |
980 | } | |
981 | ||
982 | { | |
983 | const char *name; | |
984 | const struct lttng_buffer_view provider_name_view = | |
985 | lttng_buffer_view_from_view(view, offset, | |
986 | provider_name_len); | |
987 | ||
988 | if (!lttng_buffer_view_is_valid(&provider_name_view)) { | |
989 | ret = -1; | |
990 | goto end; | |
991 | } | |
992 | ||
993 | name = provider_name_view.data; | |
994 | ||
995 | if (!lttng_buffer_view_contains_string(&provider_name_view, | |
996 | name, provider_name_len)) { | |
997 | ret = -1; | |
998 | goto end; | |
999 | } | |
1000 | ||
1001 | provider_name = lttng_strndup(name, provider_name_len); | |
1002 | if (!provider_name) { | |
1003 | ret = -1; | |
1004 | goto end; | |
1005 | } | |
1006 | offset += provider_name_len; | |
1007 | } | |
1008 | ||
1009 | { | |
1010 | const char *name; | |
1011 | const struct lttng_buffer_view context_name_view = | |
1012 | lttng_buffer_view_from_view( | |
1013 | view, offset, context_name_len); | |
1014 | ||
1015 | if (!lttng_buffer_view_is_valid(&context_name_view)) { | |
1016 | ret = -1; | |
1017 | goto end; | |
1018 | } | |
1019 | ||
1020 | name = context_name_view.data; | |
1021 | ||
1022 | if (!lttng_buffer_view_contains_string(&context_name_view, name, | |
1023 | context_name_len)) { | |
1024 | ret = -1; | |
1025 | goto end; | |
1026 | } | |
1027 | ||
1028 | context_name = lttng_strndup(name, context_name_len); | |
1029 | if (!context_name) { | |
1030 | ret = -1; | |
1031 | goto end; | |
1032 | } | |
1033 | ||
1034 | offset += context_name_len; | |
1035 | } | |
1036 | ||
1037 | /* Transfer ownership of the strings */ | |
1038 | event_ctx->u.app_ctx.provider_name = provider_name; | |
1039 | event_ctx->u.app_ctx.ctx_name = context_name; | |
1040 | provider_name = NULL; | |
1041 | context_name = NULL; | |
1042 | ||
1043 | ret = offset; | |
1044 | end: | |
1045 | free(provider_name); | |
1046 | free(context_name); | |
1047 | ||
1048 | return ret; | |
1049 | } | |
1050 | ||
1051 | static ssize_t lttng_event_context_perf_counter_populate_from_buffer( | |
1052 | const struct lttng_buffer_view *view, | |
1053 | struct lttng_event_context *event_ctx) | |
1054 | { | |
1055 | ssize_t ret, offset = 0; | |
1056 | const struct lttng_event_context_perf_counter_comm *comm; | |
1057 | size_t name_len; | |
1058 | const struct lttng_buffer_view comm_view = lttng_buffer_view_from_view( | |
1059 | view, offset, sizeof(*comm)); | |
1060 | ||
1061 | assert(event_ctx->ctx == LTTNG_EVENT_CONTEXT_PERF_COUNTER || | |
1062 | event_ctx->ctx == | |
1063 | LTTNG_EVENT_CONTEXT_PERF_THREAD_COUNTER || | |
1064 | event_ctx->ctx == LTTNG_EVENT_CONTEXT_PERF_CPU_COUNTER); | |
1065 | ||
1066 | if (!lttng_buffer_view_is_valid(&comm_view)) { | |
1067 | ret = -1; | |
1068 | goto end; | |
1069 | } | |
1070 | ||
1071 | comm = (typeof(comm)) comm_view.data; | |
1072 | offset += sizeof(*comm); | |
1073 | ||
1074 | name_len = comm->name_len; | |
1075 | { | |
1076 | const char *name; | |
1077 | const struct lttng_buffer_view provider_name_view = | |
1078 | lttng_buffer_view_from_view( | |
1079 | view, offset, name_len); | |
1080 | if (!lttng_buffer_view_is_valid(&provider_name_view)) { | |
1081 | ret = -1; | |
1082 | goto end; | |
1083 | } | |
1084 | ||
1085 | name = provider_name_view.data; | |
1086 | ||
1087 | if (!lttng_buffer_view_contains_string( | |
1088 | &provider_name_view, name, name_len)) { | |
1089 | ret = -1; | |
1090 | goto end; | |
1091 | } | |
1092 | ||
1093 | lttng_strncpy(event_ctx->u.perf_counter.name, name, name_len); | |
1094 | offset += name_len; | |
1095 | } | |
1096 | ||
1097 | event_ctx->u.perf_counter.config = comm->config; | |
1098 | event_ctx->u.perf_counter.type = comm->type; | |
1099 | ||
1100 | ret = offset; | |
1101 | ||
1102 | end: | |
1103 | return ret; | |
1104 | } | |
1105 | ||
1106 | LTTNG_HIDDEN | |
1107 | ssize_t lttng_event_context_create_from_buffer( | |
1108 | const struct lttng_buffer_view *view, | |
1109 | struct lttng_event_context **event_ctx) | |
1110 | { | |
1111 | ssize_t ret, offset = 0; | |
1112 | const struct lttng_event_context_comm *comm; | |
1113 | struct lttng_event_context *local_context = NULL; | |
1114 | struct lttng_buffer_view subtype_view; | |
1115 | struct lttng_buffer_view comm_view = lttng_buffer_view_from_view( | |
1116 | view, offset, sizeof(*comm)); | |
1117 | ||
1118 | assert(event_ctx); | |
1119 | assert(view); | |
1120 | ||
1121 | if (!lttng_buffer_view_is_valid(&comm_view)) { | |
1122 | ret = -1; | |
1123 | goto end; | |
1124 | } | |
1125 | ||
1126 | comm = (typeof(comm)) comm_view.data; | |
1127 | offset += sizeof(*comm); | |
1128 | ||
1129 | local_context = zmalloc(sizeof(*local_context)); | |
1130 | if (!local_context) { | |
1131 | ret = -1; | |
1132 | goto end; | |
1133 | } | |
1134 | ||
1135 | local_context->ctx = comm->type; | |
1136 | ||
1137 | subtype_view = lttng_buffer_view_from_view(view, offset, -1); | |
1138 | ||
1139 | switch (local_context->ctx) { | |
1140 | case LTTNG_EVENT_CONTEXT_APP_CONTEXT: | |
1141 | ret = lttng_event_context_app_populate_from_buffer( | |
1142 | &subtype_view, local_context); | |
1143 | break; | |
1144 | case LTTNG_EVENT_CONTEXT_PERF_COUNTER: | |
1145 | case LTTNG_EVENT_CONTEXT_PERF_THREAD_COUNTER: | |
1146 | case LTTNG_EVENT_CONTEXT_PERF_CPU_COUNTER: | |
1147 | ret = lttng_event_context_perf_counter_populate_from_buffer( | |
1148 | &subtype_view, local_context); | |
1149 | break; | |
1150 | default: | |
1151 | /* Nothing else to deserialize. */ | |
1152 | ret = 0; | |
1153 | break; | |
1154 | } | |
1155 | ||
1156 | if (ret < 0) { | |
1157 | goto end; | |
1158 | } | |
1159 | ||
1160 | offset += ret; | |
1161 | ||
1162 | *event_ctx = local_context; | |
1163 | local_context = NULL; | |
1164 | ret = offset; | |
1165 | ||
1166 | end: | |
1167 | free(local_context); | |
1168 | return ret; | |
1169 | } | |
1170 | ||
1171 | static int lttng_event_context_app_serialize( | |
1172 | struct lttng_event_context *context, | |
1173 | struct lttng_dynamic_buffer *buffer) | |
1174 | { | |
1175 | int ret; | |
1176 | struct lttng_event_context_app_comm comm = { 0 }; | |
1177 | size_t provider_len, ctx_len; | |
1178 | const char *provider_name; | |
1179 | const char *ctx_name; | |
1180 | ||
1181 | assert(buffer); | |
1182 | assert(context); | |
1183 | assert(context->ctx == LTTNG_EVENT_CONTEXT_APP_CONTEXT); | |
1184 | ||
1185 | provider_name = context->u.app_ctx.provider_name; | |
1186 | ctx_name = context->u.app_ctx.ctx_name; | |
1187 | ||
1188 | if (!provider_name || !ctx_name) { | |
1189 | ret = -LTTNG_ERR_INVALID; | |
1190 | goto end; | |
1191 | } | |
1192 | ||
1193 | provider_len = strlen(provider_name); | |
1194 | if (provider_len == 0) { | |
1195 | ret = -LTTNG_ERR_INVALID; | |
1196 | goto end; | |
1197 | } | |
1198 | ||
1199 | /* Include the null terminator. */ | |
1200 | comm.provider_name_len = provider_len + 1; | |
1201 | ||
1202 | ctx_len = strlen(ctx_name); | |
1203 | if (ctx_len == 0) { | |
1204 | ret = -LTTNG_ERR_INVALID; | |
1205 | goto end; | |
1206 | } | |
1207 | ||
1208 | /* Include the null terminator. */ | |
1209 | comm.ctx_name_len = ctx_len + 1; | |
1210 | ||
1211 | /* Header */ | |
1212 | ret = lttng_dynamic_buffer_append(buffer, &comm, sizeof(comm)); | |
1213 | if (ret) { | |
1214 | ret = -1; | |
1215 | goto end; | |
1216 | } | |
1217 | ||
1218 | ret = lttng_dynamic_buffer_append(buffer, provider_name, provider_len); | |
1219 | if (ret) { | |
1220 | ret = -1; | |
1221 | goto end; | |
1222 | } | |
1223 | ret = lttng_dynamic_buffer_append(buffer, ctx_name, ctx_len); | |
1224 | if (ret) { | |
1225 | ret = -1; | |
1226 | goto end; | |
1227 | } | |
1228 | ||
1229 | end: | |
1230 | return ret; | |
1231 | } | |
1232 | ||
1233 | static int lttng_event_context_perf_counter_serialize( | |
1234 | struct lttng_event_perf_counter_ctx *context, | |
1235 | struct lttng_dynamic_buffer *buffer) | |
1236 | { | |
1237 | int ret; | |
1238 | struct lttng_event_context_perf_counter_comm comm = { 0 }; | |
1239 | ||
1240 | assert(buffer); | |
1241 | assert(context); | |
1242 | ||
1243 | comm.config = context->config; | |
1244 | comm.type = context->type; | |
1245 | comm.name_len = lttng_strnlen(context->name, LTTNG_SYMBOL_NAME_LEN); | |
1246 | ||
1247 | if (comm.name_len == LTTNG_SYMBOL_NAME_LEN) { | |
1248 | ret = -1; | |
1249 | goto end; | |
1250 | } | |
1251 | ||
1252 | /* Include the null terminator. */ | |
1253 | comm.name_len += 1; | |
1254 | ||
1255 | /* Header */ | |
1256 | ret = lttng_dynamic_buffer_append(buffer, &comm, sizeof(comm)); | |
1257 | if (ret) { | |
1258 | ret = -1; | |
1259 | goto end; | |
1260 | } | |
1261 | ||
1262 | ret = lttng_dynamic_buffer_append(buffer, context->name, comm.name_len); | |
1263 | if (ret) { | |
1264 | ret = -1; | |
1265 | goto end; | |
1266 | } | |
1267 | ||
1268 | end: | |
1269 | return ret; | |
1270 | } | |
1271 | ||
1272 | LTTNG_HIDDEN | |
1273 | int lttng_event_context_serialize(struct lttng_event_context *context, | |
1274 | struct lttng_dynamic_buffer *buf) | |
1275 | { | |
1276 | int ret; | |
1277 | struct lttng_event_context_comm context_comm = { 0 }; | |
1278 | ||
1279 | assert(context); | |
1280 | assert(buf); | |
1281 | ||
1282 | context_comm.type = (uint32_t) context->ctx; | |
1283 | ||
1284 | /* Header */ | |
1285 | ret = lttng_dynamic_buffer_append( | |
1286 | buf, &context_comm, sizeof(context_comm)); | |
1287 | if (ret) { | |
1288 | goto end; | |
1289 | } | |
1290 | ||
1291 | switch (context->ctx) { | |
1292 | case LTTNG_EVENT_CONTEXT_APP_CONTEXT: | |
1293 | ret = lttng_event_context_app_serialize(context, buf); | |
1294 | break; | |
1295 | case LTTNG_EVENT_CONTEXT_PERF_COUNTER: | |
1296 | case LTTNG_EVENT_CONTEXT_PERF_THREAD_COUNTER: | |
1297 | case LTTNG_EVENT_CONTEXT_PERF_CPU_COUNTER: | |
1298 | ret = lttng_event_context_perf_counter_serialize( | |
1299 | &context->u.perf_counter, buf); | |
1300 | break; | |
1301 | default: | |
1302 | /* Nothing else to serialize. */ | |
1303 | break; | |
1304 | } | |
1305 | ||
1306 | if (ret) { | |
1307 | goto end; | |
1308 | } | |
1309 | ||
1310 | end: | |
1311 | return ret; | |
1312 | } | |
1313 | ||
1314 | LTTNG_HIDDEN | |
1315 | void lttng_event_context_destroy(struct lttng_event_context *context) | |
1316 | { | |
1317 | if (!context) { | |
1318 | return; | |
1319 | } | |
1320 | ||
1321 | if (context->ctx == LTTNG_EVENT_CONTEXT_APP_CONTEXT) { | |
1322 | free(context->u.app_ctx.provider_name); | |
1323 | free(context->u.app_ctx.ctx_name); | |
1324 | } | |
1325 | ||
1326 | free(context); | |
1327 | } | |
166fc586 JR |
1328 | static enum lttng_error_code compute_flattened_size( |
1329 | struct lttng_dynamic_pointer_array *events, size_t *size) | |
1330 | { | |
1331 | enum lttng_error_code ret_code; | |
1332 | int ret = 0; | |
1333 | size_t storage_req, event_count, i; | |
1334 | ||
1335 | assert(size); | |
1336 | assert(events); | |
1337 | ||
1338 | event_count = lttng_dynamic_pointer_array_get_count(events); | |
1339 | ||
1340 | /* The basic struct lttng_event */ | |
1341 | storage_req = event_count * sizeof(struct lttng_event); | |
1342 | ||
1343 | for (i = 0; i < event_count; i++) { | |
1344 | int probe_storage_req = 0; | |
1345 | const struct event_list_element *element = | |
1346 | lttng_dynamic_pointer_array_get_pointer( | |
1347 | events, i); | |
1348 | const struct lttng_userspace_probe_location *location = NULL; | |
1349 | ||
1350 | location = lttng_event_get_userspace_probe_location( | |
1351 | element->event); | |
1352 | if (location) { | |
1353 | ret = lttng_userspace_probe_location_flatten( | |
1354 | location, NULL); | |
1355 | if (ret < 0) { | |
1356 | ret_code = LTTNG_ERR_PROBE_LOCATION_INVAL; | |
1357 | goto end; | |
1358 | } | |
1359 | ||
1360 | probe_storage_req = ret; | |
1361 | } | |
1362 | ||
1363 | /* The struct·lttng_event_extended */ | |
1364 | storage_req += event_count * | |
1365 | sizeof(struct lttng_event_extended); | |
1366 | ||
1367 | if (element->filter_expression) { | |
1368 | storage_req += strlen(element->filter_expression) + 1; | |
1369 | } | |
1370 | ||
1371 | if (element->exclusions) { | |
1372 | storage_req += element->exclusions->count * | |
1373 | LTTNG_SYMBOL_NAME_LEN; | |
1374 | } | |
1375 | ||
1376 | /* Padding to ensure the flat probe is aligned. */ | |
1377 | storage_req = ALIGN_TO(storage_req, sizeof(uint64_t)); | |
1378 | storage_req += probe_storage_req; | |
1379 | } | |
1380 | ||
1381 | *size = storage_req; | |
1382 | ret_code = LTTNG_OK; | |
1383 | ||
1384 | end: | |
1385 | return ret_code; | |
1386 | } | |
1387 | ||
1388 | /* | |
1389 | * Flatten a list of struct lttng_event. | |
1390 | * | |
1391 | * The buffer that is returned to the API client must contain a "flat" version | |
1392 | * of the events that are returned. In other words, all pointers within an | |
1393 | * lttng_event must point to a location within the returned buffer so that the | |
1394 | * user may free everything by simply calling free() on the returned buffer. | |
1395 | * This is needed in order to maintain API compatibility. | |
1396 | * | |
1397 | * A first pass is performed to compute the size of the buffer that must be | |
1398 | * allocated. A second pass is then performed to setup the returned events so | |
1399 | * that their members always point within the buffer. | |
1400 | * | |
1401 | * The layout of the returned buffer is as follows: | |
1402 | * - struct lttng_event[nb_events], | |
1403 | * - nb_events times the following: | |
1404 | * - struct lttng_event_extended, | |
1405 | * - filter_expression | |
1406 | * - exclusions | |
1407 | * - padding to align to 64-bits | |
1408 | * - flattened version of userspace_probe_location | |
1409 | */ | |
1410 | static enum lttng_error_code flatten_lttng_events( | |
1411 | struct lttng_dynamic_pointer_array *events, | |
1412 | struct lttng_event **flattened_events) | |
1413 | { | |
1414 | enum lttng_error_code ret_code; | |
1415 | int ret, i; | |
1416 | size_t storage_req; | |
1417 | struct lttng_dynamic_buffer local_flattened_events; | |
1418 | int nb_events; | |
1419 | ||
1420 | assert(events); | |
1421 | assert(flattened_events); | |
1422 | ||
1423 | lttng_dynamic_buffer_init(&local_flattened_events); | |
1424 | nb_events = lttng_dynamic_pointer_array_get_count(events); | |
1425 | ||
1426 | ret_code = compute_flattened_size(events, &storage_req); | |
1427 | if (ret_code != LTTNG_OK) { | |
1428 | goto end; | |
1429 | } | |
1430 | ||
1431 | /* | |
1432 | * We must ensure that "local_flattened_events" is never resized so as | |
1433 | * to preserve the validity of the flattened objects. | |
1434 | */ | |
1435 | ret = lttng_dynamic_buffer_set_capacity( | |
1436 | &local_flattened_events, storage_req); | |
1437 | if (ret) { | |
1438 | ret_code = LTTNG_ERR_NOMEM; | |
1439 | goto end; | |
1440 | } | |
1441 | ||
1442 | /* Start by laying the struct lttng_event */ | |
1443 | for (i = 0; i < nb_events; i++) { | |
1444 | struct event_list_element *element = | |
1445 | lttng_dynamic_pointer_array_get_pointer( | |
1446 | events, i); | |
1447 | ||
1448 | if (!element) { | |
1449 | ret_code = LTTNG_ERR_FATAL; | |
1450 | goto end; | |
1451 | } | |
1452 | ret = lttng_dynamic_buffer_append(&local_flattened_events, | |
1453 | element->event, sizeof(struct lttng_event)); | |
1454 | if (ret) { | |
1455 | ret_code = LTTNG_ERR_NOMEM; | |
1456 | goto end; | |
1457 | } | |
1458 | } | |
1459 | ||
1460 | for (i = 0; i < nb_events; i++) { | |
1461 | struct event_list_element *element = lttng_dynamic_pointer_array_get_pointer(events, i); | |
1462 | struct lttng_event *event = (struct lttng_event *) | |
1463 | (local_flattened_events.data + (sizeof(struct lttng_event) * i)); | |
1464 | struct lttng_event_extended *event_extended = | |
1465 | (struct lttng_event_extended *) | |
1466 | (local_flattened_events.data + local_flattened_events.size); | |
1467 | const struct lttng_userspace_probe_location *location = NULL; | |
1468 | ||
1469 | assert(element); | |
1470 | ||
1471 | /* Insert struct lttng_event_extended. */ | |
1472 | ret = lttng_dynamic_buffer_set_size(&local_flattened_events, | |
1473 | local_flattened_events.size + | |
1474 | sizeof(*event_extended)); | |
1475 | if (ret) { | |
1476 | ret_code = LTTNG_ERR_NOMEM; | |
1477 | goto end; | |
1478 | } | |
1479 | event->extended.ptr = event_extended; | |
1480 | ||
1481 | /* Insert filter expression. */ | |
1482 | if (element->filter_expression) { | |
1483 | size_t len = strlen(element->filter_expression) + 1; | |
1484 | ||
1485 | event_extended->filter_expression = | |
1486 | local_flattened_events.data + | |
1487 | local_flattened_events.size; | |
1488 | ret = lttng_dynamic_buffer_append( | |
1489 | &local_flattened_events, | |
1490 | element->filter_expression, len); | |
1491 | if (ret) { | |
1492 | ret_code = LTTNG_ERR_NOMEM; | |
1493 | goto end; | |
1494 | } | |
1495 | } | |
1496 | ||
1497 | /* Insert exclusions. */ | |
1498 | if (element->exclusions) { | |
1499 | event_extended->exclusions.count = | |
1500 | element->exclusions->count; | |
1501 | event_extended->exclusions.strings = | |
1502 | local_flattened_events.data + | |
1503 | local_flattened_events.size; | |
1504 | ||
1505 | ret = lttng_dynamic_buffer_append( | |
1506 | &local_flattened_events, | |
1507 | element->exclusions->names, | |
1508 | element->exclusions->count * | |
1509 | LTTNG_SYMBOL_NAME_LEN); | |
1510 | if (ret) { | |
1511 | ret_code = LTTNG_ERR_NOMEM; | |
1512 | goto end; | |
1513 | } | |
1514 | } | |
1515 | ||
1516 | /* Insert padding to align to 64-bits. */ | |
1517 | ret = lttng_dynamic_buffer_set_size(&local_flattened_events, | |
1518 | ALIGN_TO(local_flattened_events.size, | |
1519 | sizeof(uint64_t))); | |
1520 | if (ret) { | |
1521 | ret_code = LTTNG_ERR_NOMEM; | |
1522 | goto end; | |
1523 | } | |
1524 | ||
1525 | location = lttng_event_get_userspace_probe_location( | |
1526 | element->event); | |
1527 | if (location) { | |
1528 | event_extended->probe_location = (struct lttng_userspace_probe_location *) | |
1529 | (local_flattened_events.data + local_flattened_events.size); | |
1530 | ret = lttng_userspace_probe_location_flatten( | |
1531 | location, &local_flattened_events); | |
1532 | if (ret < 0) { | |
1533 | ret_code = LTTNG_ERR_PROBE_LOCATION_INVAL; | |
1534 | goto end; | |
1535 | } | |
1536 | } | |
1537 | } | |
1538 | ||
1539 | /* Don't reset local_flattened_events buffer as we return its content. */ | |
1540 | *flattened_events = (struct lttng_event *) local_flattened_events.data; | |
1541 | lttng_dynamic_buffer_init(&local_flattened_events); | |
1542 | ret_code = LTTNG_OK; | |
1543 | end: | |
1544 | lttng_dynamic_buffer_reset(&local_flattened_events); | |
1545 | return ret_code; | |
1546 | } | |
1547 | ||
1548 | static enum lttng_error_code event_list_create_from_buffer( | |
1549 | const struct lttng_buffer_view *view, | |
1550 | unsigned int count, | |
1551 | struct lttng_dynamic_pointer_array *event_list) | |
1552 | { | |
1553 | enum lttng_error_code ret_code; | |
1554 | int ret; | |
1555 | unsigned int i; | |
1556 | int offset = 0; | |
1557 | ||
1558 | assert(view); | |
1559 | assert(event_list); | |
1560 | ||
1561 | for (i = 0; i < count; i++) { | |
1562 | ssize_t event_size; | |
1563 | const struct lttng_buffer_view event_view = | |
1564 | lttng_buffer_view_from_view(view, offset, -1); | |
1565 | struct event_list_element *element = zmalloc(sizeof(*element)); | |
1566 | ||
1567 | if (!element) { | |
1568 | ret_code = LTTNG_ERR_NOMEM; | |
1569 | goto end; | |
1570 | } | |
1571 | ||
1572 | /* | |
1573 | * Lifetime and management of the object is now bound to the | |
1574 | * array. | |
1575 | */ | |
1576 | ret = lttng_dynamic_pointer_array_add_pointer( | |
1577 | event_list, element); | |
1578 | if (ret) { | |
1579 | event_list_destructor(element); | |
1580 | ret_code = LTTNG_ERR_NOMEM; | |
1581 | goto end; | |
1582 | } | |
1583 | ||
1584 | /* | |
1585 | * Bytecode is not transmitted on listing in any case we do not | |
1586 | * care about it. | |
1587 | */ | |
1588 | event_size = lttng_event_create_from_buffer(&event_view, | |
1589 | &element->event, | |
1590 | &element->exclusions, | |
1591 | &element->filter_expression, NULL, -1); | |
1592 | if (event_size < 0) { | |
1593 | ret_code = LTTNG_ERR_INVALID; | |
1594 | goto end; | |
1595 | } | |
1596 | ||
1597 | offset += event_size; | |
1598 | } | |
1599 | ||
1600 | if (view->size != offset) { | |
1601 | ret_code = LTTNG_ERR_INVALID; | |
1602 | goto end; | |
1603 | } | |
1604 | ||
1605 | ret_code = LTTNG_OK; | |
1606 | ||
1607 | end: | |
1608 | return ret_code; | |
1609 | } | |
1610 | ||
1611 | LTTNG_HIDDEN | |
1612 | enum lttng_error_code lttng_events_create_and_flatten_from_buffer( | |
1613 | const struct lttng_buffer_view *view, | |
1614 | unsigned int count, | |
1615 | struct lttng_event **events) | |
1616 | { | |
1617 | enum lttng_error_code ret = LTTNG_OK; | |
1618 | struct lttng_dynamic_pointer_array local_events; | |
1619 | ||
1620 | lttng_dynamic_pointer_array_init(&local_events, event_list_destructor); | |
1621 | ||
1622 | /* Deserialize the events */ | |
1623 | { | |
1624 | const struct lttng_buffer_view events_view = | |
1625 | lttng_buffer_view_from_view(view, 0, -1); | |
1626 | ||
1627 | ret = event_list_create_from_buffer( | |
1628 | &events_view, count, &local_events); | |
1629 | if (ret != LTTNG_OK) { | |
1630 | goto end; | |
1631 | } | |
1632 | } | |
1633 | ||
1634 | ret = flatten_lttng_events(&local_events, events); | |
1635 | if (ret != LTTNG_OK) { | |
1636 | goto end; | |
1637 | } | |
1638 | ||
1639 | end: | |
1640 | lttng_dynamic_pointer_array_reset(&local_events); | |
1641 | return ret; | |
1642 | } |