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 | ||
c9e313bc SM |
8 | #include <common/align.hpp> |
9 | #include <common/buffer-view.hpp> | |
10 | #include <common/compat/string.hpp> | |
11 | #include <common/dynamic-array.hpp> | |
12 | #include <common/dynamic-buffer.hpp> | |
13 | #include <common/error.hpp> | |
14 | #include <common/macros.hpp> | |
15 | #include <common/sessiond-comm/sessiond-comm.hpp> | |
16 | ||
8ddd72ef | 17 | #include <lttng/constant.h> |
c9e313bc | 18 | #include <lttng/event-internal.hpp> |
8ddd72ef | 19 | #include <lttng/event.h> |
c9e313bc SM |
20 | #include <lttng/lttng-error.h> |
21 | #include <lttng/userspace-probe-internal.hpp> | |
8ddd72ef | 22 | |
f1494934 | 23 | namespace { |
8ddd72ef JR |
24 | struct event_list_element { |
25 | struct lttng_event *event; | |
26 | struct lttng_event_exclusion *exclusions; | |
27 | char *filter_expression; | |
28 | }; | |
f1494934 | 29 | } /* namespace */ |
8ddd72ef JR |
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 | 40 | |
76fcf151 JG |
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 | ||
64803277 | 46 | new_event = zmalloc<lttng_event>(); |
76fcf151 JG |
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 | */ | |
64803277 | 59 | new_event_extended = zmalloc<lttng_event_extended>(); |
76fcf151 JG |
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); | |
cd9adb8b | 70 | new_event = nullptr; |
76fcf151 JG |
71 | goto end; |
72 | } | |
8ddd72ef | 73 | |
28ab034a JG |
74 | static int lttng_event_probe_attr_serialize(const struct lttng_event_probe_attr *probe, |
75 | struct lttng_payload *payload) | |
8ddd72ef JR |
76 | { |
77 | int ret; | |
78 | size_t symbol_name_len; | |
1c9a0b0e | 79 | struct lttng_event_probe_attr_comm comm = {}; |
8ddd72ef | 80 | |
28ab034a | 81 | symbol_name_len = lttng_strnlen(probe->symbol_name, sizeof(probe->symbol_name)); |
2d6df81a | 82 | if (symbol_name_len == sizeof(probe->symbol_name)) { |
8ddd72ef JR |
83 | /* Not null-termintated. */ |
84 | ret = -1; | |
85 | goto end; | |
86 | } | |
87 | ||
88 | /* Include the null terminator. */ | |
89 | symbol_name_len += 1; | |
90 | ||
91 | comm.symbol_name_len = (uint32_t) symbol_name_len; | |
92 | comm.addr = probe->addr; | |
93 | comm.offset = probe->addr; | |
94 | ||
28ab034a | 95 | ret = lttng_dynamic_buffer_append(&payload->buffer, &comm, sizeof(comm)); |
8ddd72ef JR |
96 | if (ret < 0) { |
97 | ret = -1; | |
98 | goto end; | |
99 | } | |
100 | ||
28ab034a | 101 | ret = lttng_dynamic_buffer_append(&payload->buffer, probe->symbol_name, symbol_name_len); |
8ddd72ef JR |
102 | end: |
103 | return ret; | |
104 | } | |
105 | ||
28ab034a JG |
106 | static int lttng_event_function_attr_serialize(const struct lttng_event_function_attr *function, |
107 | struct lttng_payload *payload) | |
8ddd72ef JR |
108 | { |
109 | int ret; | |
110 | size_t symbol_name_len; | |
c58be5ff JG |
111 | struct lttng_event_function_attr_comm comm; |
112 | ||
113 | comm.symbol_name_len = 0; | |
8ddd72ef | 114 | |
28ab034a | 115 | symbol_name_len = lttng_strnlen(function->symbol_name, sizeof(function->symbol_name)); |
2d6df81a | 116 | if (symbol_name_len == sizeof(function->symbol_name)) { |
8ddd72ef JR |
117 | /* Not null-termintated. */ |
118 | ret = -1; | |
119 | goto end; | |
120 | } | |
121 | ||
122 | /* Include the null terminator. */ | |
123 | symbol_name_len += 1; | |
124 | ||
125 | comm.symbol_name_len = (uint32_t) symbol_name_len; | |
126 | ||
28ab034a | 127 | ret = lttng_dynamic_buffer_append(&payload->buffer, &comm, sizeof(comm)); |
8ddd72ef JR |
128 | if (ret < 0) { |
129 | ret = -1; | |
130 | goto end; | |
131 | } | |
132 | ||
28ab034a | 133 | ret = lttng_dynamic_buffer_append(&payload->buffer, function->symbol_name, symbol_name_len); |
8ddd72ef JR |
134 | end: |
135 | return ret; | |
136 | } | |
137 | ||
28ab034a JG |
138 | static ssize_t |
139 | lttng_event_probe_attr_create_from_payload(struct lttng_payload_view *view, | |
140 | struct lttng_event_probe_attr **probe_attr) | |
8ddd72ef JR |
141 | { |
142 | ssize_t ret, offset = 0; | |
143 | const struct lttng_event_probe_attr_comm *comm; | |
cd9adb8b | 144 | struct lttng_event_probe_attr *local_attr = nullptr; |
28ab034a JG |
145 | struct lttng_payload_view comm_view = |
146 | lttng_payload_view_from_view(view, offset, sizeof(*comm)); | |
8ddd72ef JR |
147 | |
148 | if (!lttng_payload_view_is_valid(&comm_view)) { | |
149 | ret = -1; | |
150 | goto end; | |
151 | } | |
152 | ||
153 | comm = (typeof(comm)) comm_view.buffer.data; | |
154 | offset += sizeof(*comm); | |
155 | ||
64803277 | 156 | local_attr = zmalloc<lttng_event_probe_attr>(); |
cd9adb8b | 157 | if (local_attr == nullptr) { |
8ddd72ef JR |
158 | ret = -1; |
159 | goto end; | |
160 | } | |
161 | ||
162 | local_attr->addr = comm->addr; | |
163 | local_attr->offset = comm->offset; | |
164 | ||
165 | { | |
166 | const char *name; | |
167 | struct lttng_payload_view name_view = | |
28ab034a | 168 | lttng_payload_view_from_view(view, offset, comm->symbol_name_len); |
8ddd72ef JR |
169 | |
170 | if (!lttng_payload_view_is_valid(&name_view)) { | |
171 | ret = -1; | |
172 | goto end; | |
173 | } | |
174 | ||
175 | name = name_view.buffer.data; | |
176 | ||
28ab034a JG |
177 | if (!lttng_buffer_view_contains_string( |
178 | &name_view.buffer, name, comm->symbol_name_len)) { | |
8ddd72ef JR |
179 | ret = -1; |
180 | goto end; | |
181 | } | |
182 | ||
28ab034a | 183 | ret = lttng_strncpy(local_attr->symbol_name, name, sizeof(local_attr->symbol_name)); |
8ddd72ef JR |
184 | if (ret) { |
185 | ret = -1; | |
186 | goto end; | |
187 | } | |
188 | ||
189 | offset += comm->symbol_name_len; | |
190 | } | |
191 | ||
192 | *probe_attr = local_attr; | |
cd9adb8b | 193 | local_attr = nullptr; |
8ddd72ef JR |
194 | ret = offset; |
195 | end: | |
9eb895d7 | 196 | free(local_attr); |
8ddd72ef JR |
197 | return ret; |
198 | } | |
199 | ||
28ab034a JG |
200 | static ssize_t |
201 | lttng_event_function_attr_create_from_payload(struct lttng_payload_view *view, | |
202 | struct lttng_event_function_attr **function_attr) | |
8ddd72ef JR |
203 | { |
204 | ssize_t ret, offset = 0; | |
205 | const struct lttng_event_function_attr_comm *comm; | |
cd9adb8b | 206 | struct lttng_event_function_attr *local_attr = nullptr; |
28ab034a JG |
207 | struct lttng_payload_view comm_view = |
208 | lttng_payload_view_from_view(view, offset, sizeof(*comm)); | |
8ddd72ef JR |
209 | |
210 | if (!lttng_payload_view_is_valid(&comm_view)) { | |
211 | ret = -1; | |
212 | goto end; | |
213 | } | |
214 | ||
215 | comm = (typeof(comm)) view->buffer.data; | |
216 | offset += sizeof(*comm); | |
217 | ||
64803277 | 218 | local_attr = zmalloc<lttng_event_function_attr>(); |
cd9adb8b | 219 | if (local_attr == nullptr) { |
8ddd72ef JR |
220 | ret = -1; |
221 | goto end; | |
222 | } | |
223 | ||
224 | { | |
225 | const char *name; | |
226 | struct lttng_payload_view name_view = | |
28ab034a | 227 | lttng_payload_view_from_view(view, offset, comm->symbol_name_len); |
8ddd72ef JR |
228 | |
229 | if (!lttng_payload_view_is_valid(&name_view)) { | |
230 | ret = -1; | |
231 | goto end; | |
232 | } | |
233 | ||
234 | name = name_view.buffer.data; | |
235 | ||
28ab034a JG |
236 | if (!lttng_buffer_view_contains_string( |
237 | &name_view.buffer, name, comm->symbol_name_len)) { | |
8ddd72ef JR |
238 | ret = -1; |
239 | goto end; | |
240 | } | |
241 | ||
28ab034a | 242 | ret = lttng_strncpy(local_attr->symbol_name, name, sizeof(local_attr->symbol_name)); |
8ddd72ef JR |
243 | if (ret) { |
244 | ret = -1; | |
245 | goto end; | |
246 | } | |
247 | ||
248 | offset += comm->symbol_name_len; | |
249 | } | |
250 | ||
251 | *function_attr = local_attr; | |
cd9adb8b | 252 | local_attr = nullptr; |
8ddd72ef JR |
253 | ret = offset; |
254 | end: | |
9eb895d7 | 255 | free(local_attr); |
8ddd72ef JR |
256 | return ret; |
257 | } | |
258 | ||
28ab034a JG |
259 | static ssize_t lttng_event_exclusions_create_from_payload(struct lttng_payload_view *view, |
260 | uint32_t count, | |
261 | struct lttng_event_exclusion **exclusions) | |
8ddd72ef JR |
262 | { |
263 | ssize_t ret, offset = 0; | |
64803277 | 264 | const size_t size = (count * LTTNG_SYMBOL_NAME_LEN); |
8ddd72ef JR |
265 | uint32_t i; |
266 | const struct lttng_event_exclusion_comm *comm; | |
267 | struct lttng_event_exclusion *local_exclusions; | |
268 | ||
28ab034a JG |
269 | local_exclusions = |
270 | zmalloc<lttng_event_exclusion>(sizeof(struct lttng_event_exclusion) + size); | |
8ddd72ef JR |
271 | if (!local_exclusions) { |
272 | ret = -1; | |
273 | goto end; | |
274 | } | |
275 | ||
276 | local_exclusions->count = count; | |
277 | ||
278 | for (i = 0; i < count; i++) { | |
279 | const char *string; | |
280 | struct lttng_buffer_view string_view; | |
281 | const struct lttng_buffer_view comm_view = | |
28ab034a | 282 | lttng_buffer_view_from_view(&view->buffer, offset, sizeof(*comm)); |
8ddd72ef JR |
283 | |
284 | if (!lttng_buffer_view_is_valid(&comm_view)) { | |
285 | ret = -1; | |
286 | goto end; | |
287 | } | |
288 | ||
289 | comm = (typeof(comm)) comm_view.data; | |
290 | offset += sizeof(*comm); | |
291 | ||
28ab034a | 292 | string_view = lttng_buffer_view_from_view(&view->buffer, offset, comm->len); |
8ddd72ef JR |
293 | |
294 | if (!lttng_buffer_view_is_valid(&string_view)) { | |
295 | ret = -1; | |
296 | goto end; | |
297 | } | |
298 | ||
299 | string = string_view.data; | |
300 | ||
28ab034a | 301 | if (!lttng_buffer_view_contains_string(&string_view, string, comm->len)) { |
8ddd72ef JR |
302 | ret = -1; |
303 | goto end; | |
304 | } | |
305 | ||
28ab034a JG |
306 | ret = lttng_strncpy(LTTNG_EVENT_EXCLUSION_NAME_AT(local_exclusions, i), |
307 | string, | |
308 | sizeof(LTTNG_EVENT_EXCLUSION_NAME_AT(local_exclusions, i))); | |
8ddd72ef JR |
309 | if (ret) { |
310 | ret = -1; | |
311 | goto end; | |
312 | } | |
313 | ||
314 | offset += comm->len; | |
315 | } | |
316 | ||
317 | *exclusions = local_exclusions; | |
cd9adb8b | 318 | local_exclusions = nullptr; |
8ddd72ef JR |
319 | ret = offset; |
320 | end: | |
321 | free(local_exclusions); | |
322 | return ret; | |
323 | } | |
324 | ||
325 | ssize_t lttng_event_create_from_payload(struct lttng_payload_view *view, | |
28ab034a JG |
326 | struct lttng_event **out_event, |
327 | struct lttng_event_exclusion **out_exclusion, | |
328 | char **out_filter_expression, | |
329 | struct lttng_bytecode **out_bytecode) | |
8ddd72ef JR |
330 | { |
331 | ssize_t ret, offset = 0; | |
cd9adb8b JG |
332 | struct lttng_event *local_event = nullptr; |
333 | struct lttng_event_exclusion *local_exclusions = nullptr; | |
334 | struct lttng_bytecode *local_bytecode = nullptr; | |
335 | char *local_filter_expression = nullptr; | |
8ddd72ef | 336 | const struct lttng_event_comm *event_comm; |
cd9adb8b JG |
337 | struct lttng_event_function_attr *local_function_attr = nullptr; |
338 | struct lttng_event_probe_attr *local_probe_attr = nullptr; | |
339 | struct lttng_userspace_probe_location *local_userspace_probe_location = nullptr; | |
8ddd72ef JR |
340 | |
341 | /* | |
342 | * Only event is obligatory, the other output argument are optional and | |
343 | * depends on what the caller is interested in. | |
344 | */ | |
345 | assert(out_event); | |
346 | assert(view); | |
347 | ||
348 | { | |
349 | struct lttng_payload_view comm_view = | |
28ab034a | 350 | lttng_payload_view_from_view(view, offset, sizeof(*event_comm)); |
8ddd72ef JR |
351 | |
352 | if (!lttng_payload_view_is_valid(&comm_view)) { | |
353 | ret = -1; | |
354 | goto end; | |
355 | } | |
356 | ||
357 | /* lttng_event_comm header */ | |
358 | event_comm = (typeof(event_comm)) comm_view.buffer.data; | |
359 | offset += sizeof(*event_comm); | |
360 | } | |
361 | ||
362 | local_event = lttng_event_create(); | |
cd9adb8b | 363 | if (local_event == nullptr) { |
8ddd72ef JR |
364 | ret = -1; |
365 | goto end; | |
366 | } | |
367 | ||
368 | local_event->type = (enum lttng_event_type) event_comm->event_type; | |
369 | local_event->loglevel_type = (enum lttng_loglevel_type) event_comm->loglevel_type; | |
dcd24bbf JG |
370 | local_event->loglevel = |
371 | local_event->loglevel_type == LTTNG_EVENT_LOGLEVEL_ALL ? -1 : event_comm->loglevel; | |
5c7248cd | 372 | local_event->enabled = !!event_comm->enabled; |
8ddd72ef JR |
373 | local_event->pid = event_comm->pid; |
374 | local_event->flags = (enum lttng_event_flag) event_comm->flags; | |
375 | ||
376 | { | |
377 | const char *name; | |
378 | const struct lttng_buffer_view name_view = | |
28ab034a | 379 | lttng_buffer_view_from_view(&view->buffer, offset, event_comm->name_len); |
8ddd72ef JR |
380 | |
381 | if (!lttng_buffer_view_is_valid(&name_view)) { | |
382 | ret = -1; | |
383 | goto end; | |
384 | } | |
385 | ||
386 | name = (const char *) name_view.data; | |
387 | ||
28ab034a | 388 | if (!lttng_buffer_view_contains_string(&name_view, name, event_comm->name_len)) { |
8ddd72ef JR |
389 | ret = -1; |
390 | goto end; | |
391 | } | |
392 | ||
28ab034a | 393 | ret = lttng_strncpy(local_event->name, name, sizeof(local_event->name)); |
8ddd72ef JR |
394 | if (ret) { |
395 | ret = -1; | |
396 | goto end; | |
397 | } | |
398 | ||
399 | offset += event_comm->name_len; | |
400 | } | |
401 | ||
402 | /* Exclusions */ | |
403 | if (event_comm->exclusion_count == 0) { | |
404 | goto deserialize_filter_expression; | |
405 | } | |
406 | ||
407 | { | |
408 | struct lttng_payload_view exclusions_view = | |
28ab034a | 409 | lttng_payload_view_from_view(view, offset, -1); |
8ddd72ef JR |
410 | |
411 | if (!lttng_payload_view_is_valid(&exclusions_view)) { | |
412 | ret = -1; | |
413 | goto end; | |
414 | } | |
415 | ||
28ab034a JG |
416 | ret = lttng_event_exclusions_create_from_payload( |
417 | &exclusions_view, event_comm->exclusion_count, &local_exclusions); | |
8ddd72ef JR |
418 | if (ret < 0) { |
419 | ret = -1; | |
420 | goto end; | |
421 | } | |
422 | offset += ret; | |
423 | ||
424 | local_event->exclusion = 1; | |
425 | } | |
426 | ||
427 | deserialize_filter_expression: | |
428 | ||
429 | if (event_comm->filter_expression_len == 0) { | |
430 | if (event_comm->bytecode_len != 0) { | |
431 | /* | |
432 | * This is an invalid event payload. | |
433 | * | |
434 | * Filter expression without bytecode is possible but | |
435 | * not the other way around. | |
436 | * */ | |
437 | ret = -1; | |
438 | goto end; | |
439 | } | |
440 | goto deserialize_event_type_payload; | |
441 | } | |
442 | ||
443 | { | |
444 | const char *filter_expression_buffer; | |
28ab034a JG |
445 | struct lttng_buffer_view filter_expression_view = lttng_buffer_view_from_view( |
446 | &view->buffer, offset, event_comm->filter_expression_len); | |
8ddd72ef JR |
447 | |
448 | if (!lttng_buffer_view_is_valid(&filter_expression_view)) { | |
449 | ret = -1; | |
450 | goto end; | |
451 | } | |
452 | ||
453 | filter_expression_buffer = filter_expression_view.data; | |
454 | ||
455 | if (!lttng_buffer_view_contains_string(&filter_expression_view, | |
28ab034a JG |
456 | filter_expression_buffer, |
457 | event_comm->filter_expression_len)) { | |
8ddd72ef JR |
458 | ret = -1; |
459 | goto end; | |
460 | } | |
461 | ||
28ab034a JG |
462 | local_filter_expression = |
463 | lttng_strndup(filter_expression_buffer, event_comm->filter_expression_len); | |
8ddd72ef JR |
464 | if (!local_filter_expression) { |
465 | ret = -1; | |
466 | goto end; | |
467 | } | |
468 | ||
469 | local_event->filter = 1; | |
470 | ||
471 | offset += event_comm->filter_expression_len; | |
472 | } | |
473 | ||
474 | if (event_comm->bytecode_len == 0) { | |
475 | /* | |
476 | * Filter expression can be present but without bytecode | |
477 | * when dealing with event listing. | |
478 | */ | |
479 | goto deserialize_event_type_payload; | |
480 | } | |
481 | ||
482 | /* Bytecode */ | |
483 | { | |
484 | struct lttng_payload_view bytecode_view = | |
28ab034a | 485 | lttng_payload_view_from_view(view, offset, event_comm->bytecode_len); |
8ddd72ef JR |
486 | |
487 | if (!lttng_payload_view_is_valid(&bytecode_view)) { | |
488 | ret = -1; | |
489 | goto end; | |
490 | } | |
491 | ||
64803277 | 492 | local_bytecode = zmalloc<lttng_bytecode>(event_comm->bytecode_len); |
8ddd72ef JR |
493 | if (!local_bytecode) { |
494 | ret = -1; | |
495 | goto end; | |
496 | } | |
497 | ||
28ab034a JG |
498 | memcpy(local_bytecode, bytecode_view.buffer.data, event_comm->bytecode_len); |
499 | if ((local_bytecode->len + sizeof(*local_bytecode)) != event_comm->bytecode_len) { | |
8ddd72ef JR |
500 | ret = -1; |
501 | goto end; | |
502 | } | |
503 | ||
504 | offset += event_comm->bytecode_len; | |
505 | } | |
506 | ||
507 | deserialize_event_type_payload: | |
508 | /* Event type specific payload */ | |
509 | switch (local_event->type) { | |
510 | case LTTNG_EVENT_FUNCTION: | |
511 | /* Fallthrough */ | |
512 | case LTTNG_EVENT_PROBE: | |
513 | { | |
28ab034a JG |
514 | struct lttng_payload_view probe_attr_view = lttng_payload_view_from_view( |
515 | view, offset, event_comm->lttng_event_probe_attr_len); | |
8ddd72ef JR |
516 | |
517 | if (event_comm->lttng_event_probe_attr_len == 0) { | |
518 | ret = -1; | |
519 | goto end; | |
520 | } | |
521 | ||
522 | if (!lttng_payload_view_is_valid(&probe_attr_view)) { | |
523 | ret = -1; | |
524 | goto end; | |
525 | } | |
526 | ||
28ab034a JG |
527 | ret = lttng_event_probe_attr_create_from_payload(&probe_attr_view, |
528 | &local_probe_attr); | |
8ddd72ef JR |
529 | if (ret < 0 || ret != event_comm->lttng_event_probe_attr_len) { |
530 | ret = -1; | |
531 | goto end; | |
532 | } | |
533 | ||
534 | /* Copy to the local event. */ | |
28ab034a | 535 | memcpy(&local_event->attr.probe, local_probe_attr, sizeof(local_event->attr.probe)); |
8ddd72ef JR |
536 | |
537 | offset += ret; | |
538 | break; | |
539 | } | |
540 | case LTTNG_EVENT_FUNCTION_ENTRY: | |
541 | { | |
28ab034a JG |
542 | struct lttng_payload_view function_attr_view = lttng_payload_view_from_view( |
543 | view, offset, event_comm->lttng_event_function_attr_len); | |
8ddd72ef JR |
544 | |
545 | if (event_comm->lttng_event_function_attr_len == 0) { | |
546 | ret = -1; | |
547 | goto end; | |
548 | } | |
549 | ||
550 | if (!lttng_payload_view_is_valid(&function_attr_view)) { | |
551 | ret = -1; | |
552 | goto end; | |
553 | } | |
554 | ||
28ab034a JG |
555 | ret = lttng_event_function_attr_create_from_payload(&function_attr_view, |
556 | &local_function_attr); | |
8ddd72ef JR |
557 | if (ret < 0 || ret != event_comm->lttng_event_function_attr_len) { |
558 | ret = -1; | |
559 | goto end; | |
560 | } | |
561 | ||
562 | /* Copy to the local event. */ | |
28ab034a JG |
563 | memcpy(&local_event->attr.ftrace, |
564 | local_function_attr, | |
565 | sizeof(local_event->attr.ftrace)); | |
8ddd72ef JR |
566 | |
567 | offset += ret; | |
568 | ||
569 | break; | |
570 | } | |
571 | case LTTNG_EVENT_USERSPACE_PROBE: | |
572 | { | |
573 | struct lttng_payload_view userspace_probe_location_view = | |
28ab034a JG |
574 | lttng_payload_view_from_view( |
575 | view, offset, event_comm->userspace_probe_location_len); | |
8ddd72ef JR |
576 | |
577 | if (event_comm->userspace_probe_location_len == 0) { | |
578 | ret = -1; | |
579 | goto end; | |
580 | } | |
581 | ||
28ab034a | 582 | if (!lttng_payload_view_is_valid(&userspace_probe_location_view)) { |
8ddd72ef JR |
583 | ret = -1; |
584 | goto end; | |
585 | } | |
586 | ||
587 | ret = lttng_userspace_probe_location_create_from_payload( | |
28ab034a | 588 | &userspace_probe_location_view, &local_userspace_probe_location); |
8ddd72ef JR |
589 | if (ret < 0) { |
590 | WARN("Failed to create a userspace probe location from the received buffer"); | |
591 | ret = -1; | |
592 | goto end; | |
593 | } | |
594 | ||
595 | if (ret != event_comm->userspace_probe_location_len) { | |
28ab034a JG |
596 | WARN("Userspace probe location from the received buffer is not the advertised length: header length = %" PRIu32 |
597 | ", payload length = %zd", | |
598 | event_comm->userspace_probe_location_len, | |
599 | ret); | |
8ddd72ef JR |
600 | ret = -1; |
601 | goto end; | |
602 | } | |
603 | ||
604 | /* Attach the probe location to the event. */ | |
28ab034a JG |
605 | ret = lttng_event_set_userspace_probe_location(local_event, |
606 | local_userspace_probe_location); | |
8ddd72ef JR |
607 | if (ret) { |
608 | ret = LTTNG_ERR_PROBE_LOCATION_INVAL; | |
609 | goto end; | |
610 | } | |
611 | ||
612 | /* | |
613 | * Userspace probe location object ownership transfered to the | |
614 | * event object. | |
615 | */ | |
cd9adb8b | 616 | local_userspace_probe_location = nullptr; |
8ddd72ef JR |
617 | offset += event_comm->userspace_probe_location_len; |
618 | break; | |
619 | } | |
620 | case LTTNG_EVENT_TRACEPOINT: | |
621 | /* Fallthrough */ | |
622 | case LTTNG_EVENT_ALL: | |
623 | /* Fallthrough */ | |
624 | case LTTNG_EVENT_SYSCALL: | |
625 | /* Fallthrough */ | |
626 | case LTTNG_EVENT_NOOP: | |
627 | /* Nothing to do here */ | |
628 | break; | |
629 | default: | |
630 | ret = LTTNG_ERR_UND; | |
631 | goto end; | |
632 | break; | |
633 | } | |
634 | ||
635 | /* Transfer ownership to the caller. */ | |
636 | *out_event = local_event; | |
cd9adb8b | 637 | local_event = nullptr; |
8ddd72ef JR |
638 | |
639 | if (out_bytecode) { | |
640 | *out_bytecode = local_bytecode; | |
cd9adb8b | 641 | local_bytecode = nullptr; |
8ddd72ef JR |
642 | } |
643 | ||
644 | if (out_exclusion) { | |
645 | *out_exclusion = local_exclusions; | |
cd9adb8b | 646 | local_exclusions = nullptr; |
8ddd72ef JR |
647 | } |
648 | ||
649 | if (out_filter_expression) { | |
650 | *out_filter_expression = local_filter_expression; | |
cd9adb8b | 651 | local_filter_expression = nullptr; |
8ddd72ef JR |
652 | } |
653 | ||
654 | ret = offset; | |
655 | end: | |
656 | lttng_event_destroy(local_event); | |
657 | lttng_userspace_probe_location_destroy(local_userspace_probe_location); | |
658 | free(local_filter_expression); | |
659 | free(local_exclusions); | |
660 | free(local_bytecode); | |
661 | free(local_function_attr); | |
662 | free(local_probe_attr); | |
663 | return ret; | |
664 | } | |
665 | ||
666 | int lttng_event_serialize(const struct lttng_event *event, | |
28ab034a | 667 | unsigned int exclusion_count, |
1e0019bb | 668 | const char *const *exclusion_list, |
dd7ef124 | 669 | const char *filter_expression, |
28ab034a JG |
670 | size_t bytecode_len, |
671 | struct lttng_bytecode *bytecode, | |
672 | struct lttng_payload *payload) | |
8ddd72ef JR |
673 | { |
674 | int ret; | |
675 | unsigned int i; | |
676 | size_t header_offset, size_before_payload; | |
677 | size_t name_len; | |
1c9a0b0e | 678 | struct lttng_event_comm event_comm = {}; |
8ddd72ef JR |
679 | struct lttng_event_comm *header; |
680 | ||
681 | assert(event); | |
682 | assert(payload); | |
683 | assert(exclusion_count == 0 || exclusion_list); | |
684 | ||
685 | /* Save the header location for later in-place header update. */ | |
686 | header_offset = payload->buffer.size; | |
687 | ||
2d6df81a JG |
688 | name_len = lttng_strnlen(event->name, sizeof(event->name)); |
689 | if (name_len == sizeof(event->name)) { | |
8ddd72ef JR |
690 | /* Event name is not NULL-terminated. */ |
691 | ret = -1; | |
692 | goto end; | |
693 | } | |
694 | ||
695 | /* Add null termination. */ | |
696 | name_len += 1; | |
697 | ||
698 | if (exclusion_count > UINT32_MAX) { | |
699 | /* Possible overflow. */ | |
700 | ret = -1; | |
701 | goto end; | |
702 | } | |
703 | ||
704 | if (bytecode_len > UINT32_MAX) { | |
705 | /* Possible overflow. */ | |
706 | ret = -1; | |
707 | goto end; | |
708 | } | |
709 | ||
710 | event_comm.name_len = (uint32_t) name_len; | |
711 | event_comm.event_type = (int8_t) event->type; | |
712 | event_comm.loglevel_type = (int8_t) event->loglevel_type; | |
713 | event_comm.loglevel = (int32_t) event->loglevel; | |
714 | event_comm.enabled = (int8_t) event->enabled; | |
715 | event_comm.pid = (int32_t) event->pid; | |
716 | event_comm.exclusion_count = (uint32_t) exclusion_count; | |
717 | event_comm.bytecode_len = (uint32_t) bytecode_len; | |
718 | event_comm.flags = (int32_t) event->flags; | |
719 | ||
720 | if (filter_expression) { | |
28ab034a | 721 | event_comm.filter_expression_len = strlen(filter_expression) + 1; |
8ddd72ef JR |
722 | } |
723 | ||
724 | /* Header */ | |
28ab034a | 725 | ret = lttng_dynamic_buffer_append(&payload->buffer, &event_comm, sizeof(event_comm)); |
8ddd72ef JR |
726 | if (ret) { |
727 | goto end; | |
728 | } | |
729 | ||
730 | /* Event name */ | |
28ab034a | 731 | ret = lttng_dynamic_buffer_append(&payload->buffer, event->name, name_len); |
8ddd72ef JR |
732 | if (ret) { |
733 | goto end; | |
734 | } | |
735 | ||
736 | /* Exclusions */ | |
737 | for (i = 0; i < exclusion_count; i++) { | |
28ab034a JG |
738 | const size_t exclusion_len = |
739 | lttng_strnlen(*(exclusion_list + i), LTTNG_SYMBOL_NAME_LEN); | |
29784e23 | 740 | struct lttng_event_exclusion_comm exclusion_header = {}; |
85eb6b83 JG |
741 | |
742 | exclusion_header.len = (uint32_t) exclusion_len + 1; | |
8ddd72ef JR |
743 | |
744 | if (exclusion_len == LTTNG_SYMBOL_NAME_LEN) { | |
745 | /* Exclusion is not NULL-terminated. */ | |
746 | ret = -1; | |
747 | goto end; | |
748 | } | |
749 | ||
28ab034a JG |
750 | ret = lttng_dynamic_buffer_append( |
751 | &payload->buffer, &exclusion_header, sizeof(exclusion_header)); | |
8ddd72ef JR |
752 | if (ret) { |
753 | goto end; | |
754 | } | |
755 | ||
28ab034a JG |
756 | ret = lttng_dynamic_buffer_append( |
757 | &payload->buffer, *(exclusion_list + i), exclusion_len + 1); | |
8ddd72ef JR |
758 | if (ret) { |
759 | goto end; | |
760 | } | |
761 | } | |
762 | ||
763 | /* Filter expression and its bytecode */ | |
764 | if (filter_expression) { | |
28ab034a JG |
765 | ret = lttng_dynamic_buffer_append( |
766 | &payload->buffer, filter_expression, event_comm.filter_expression_len); | |
8ddd72ef JR |
767 | if (ret) { |
768 | goto end; | |
769 | } | |
770 | ||
771 | /* | |
772 | * Bytecode can be absent when we serialize to the client | |
773 | * for listing. | |
774 | */ | |
775 | if (bytecode) { | |
28ab034a | 776 | ret = lttng_dynamic_buffer_append(&payload->buffer, bytecode, bytecode_len); |
8ddd72ef JR |
777 | if (ret) { |
778 | goto end; | |
779 | } | |
780 | } | |
781 | } | |
782 | ||
783 | size_before_payload = payload->buffer.size; | |
784 | ||
785 | /* Event type specific payload */ | |
786 | switch (event->type) { | |
787 | case LTTNG_EVENT_FUNCTION: | |
788 | /* Fallthrough */ | |
789 | case LTTNG_EVENT_PROBE: | |
790 | ret = lttng_event_probe_attr_serialize(&event->attr.probe, payload); | |
791 | if (ret) { | |
792 | ret = -1; | |
793 | goto end; | |
794 | } | |
795 | ||
28ab034a JG |
796 | header = |
797 | (struct lttng_event_comm *) ((char *) payload->buffer.data + header_offset); | |
798 | header->lttng_event_probe_attr_len = payload->buffer.size - size_before_payload; | |
8ddd72ef JR |
799 | |
800 | break; | |
801 | case LTTNG_EVENT_FUNCTION_ENTRY: | |
28ab034a | 802 | ret = lttng_event_function_attr_serialize(&event->attr.ftrace, payload); |
8ddd72ef JR |
803 | if (ret) { |
804 | ret = -1; | |
805 | goto end; | |
806 | } | |
807 | ||
808 | /* Update the lttng_event_function_attr len. */ | |
28ab034a JG |
809 | header = |
810 | (struct lttng_event_comm *) ((char *) payload->buffer.data + header_offset); | |
811 | header->lttng_event_function_attr_len = payload->buffer.size - size_before_payload; | |
8ddd72ef JR |
812 | |
813 | break; | |
814 | case LTTNG_EVENT_USERSPACE_PROBE: | |
815 | { | |
816 | const struct lttng_event_extended *ev_ext = | |
28ab034a | 817 | (const struct lttng_event_extended *) event->extended.ptr; |
8ddd72ef JR |
818 | |
819 | assert(event->extended.ptr); | |
820 | assert(ev_ext->probe_location); | |
821 | ||
822 | size_before_payload = payload->buffer.size; | |
823 | if (ev_ext->probe_location) { | |
824 | /* | |
825 | * lttng_userspace_probe_location_serialize returns the | |
826 | * number of bytes that were appended to the buffer. | |
827 | */ | |
28ab034a JG |
828 | ret = lttng_userspace_probe_location_serialize(ev_ext->probe_location, |
829 | payload); | |
8ddd72ef JR |
830 | if (ret < 0) { |
831 | goto end; | |
832 | } | |
833 | ||
834 | ret = 0; | |
835 | ||
836 | /* Update the userspace probe location len. */ | |
837 | header = (struct lttng_event_comm *) ((char *) payload->buffer.data + | |
838 | header_offset); | |
839 | header->userspace_probe_location_len = | |
28ab034a | 840 | payload->buffer.size - size_before_payload; |
8ddd72ef JR |
841 | } |
842 | break; | |
843 | } | |
844 | case LTTNG_EVENT_TRACEPOINT: | |
845 | /* Fallthrough */ | |
846 | case LTTNG_EVENT_ALL: | |
847 | /* Fallthrough */ | |
848 | default: | |
849 | /* Nothing to do here. */ | |
850 | break; | |
851 | } | |
852 | ||
853 | end: | |
854 | return ret; | |
855 | } | |
856 | ||
28ab034a JG |
857 | static ssize_t lttng_event_context_app_populate_from_payload(const struct lttng_payload_view *view, |
858 | struct lttng_event_context *event_ctx) | |
26e1c61f JR |
859 | { |
860 | ssize_t ret, offset = 0; | |
861 | const struct lttng_event_context_app_comm *comm; | |
cd9adb8b | 862 | char *provider_name = nullptr, *context_name = nullptr; |
26e1c61f | 863 | size_t provider_name_len, context_name_len; |
28ab034a JG |
864 | const struct lttng_buffer_view comm_view = |
865 | lttng_buffer_view_from_view(&view->buffer, offset, sizeof(*comm)); | |
26e1c61f JR |
866 | |
867 | assert(event_ctx->ctx == LTTNG_EVENT_CONTEXT_APP_CONTEXT); | |
868 | ||
869 | if (!lttng_buffer_view_is_valid(&comm_view)) { | |
870 | ret = -1; | |
871 | goto end; | |
872 | } | |
873 | ||
874 | comm = (typeof(comm)) comm_view.data; | |
875 | offset += sizeof(*comm); | |
876 | ||
877 | provider_name_len = comm->provider_name_len; | |
878 | context_name_len = comm->ctx_name_len; | |
879 | ||
880 | if (provider_name_len == 0 || context_name_len == 0) { | |
881 | /* | |
882 | * Application provider and context names MUST | |
883 | * be provided. | |
884 | */ | |
885 | ret = -1; | |
886 | goto end; | |
887 | } | |
888 | ||
889 | { | |
890 | const char *name; | |
891 | const struct lttng_buffer_view provider_name_view = | |
28ab034a | 892 | lttng_buffer_view_from_view(&view->buffer, offset, provider_name_len); |
26e1c61f JR |
893 | |
894 | if (!lttng_buffer_view_is_valid(&provider_name_view)) { | |
895 | ret = -1; | |
896 | goto end; | |
897 | } | |
898 | ||
899 | name = provider_name_view.data; | |
900 | ||
28ab034a JG |
901 | if (!lttng_buffer_view_contains_string( |
902 | &provider_name_view, name, provider_name_len)) { | |
26e1c61f JR |
903 | ret = -1; |
904 | goto end; | |
905 | } | |
906 | ||
907 | provider_name = lttng_strndup(name, provider_name_len); | |
908 | if (!provider_name) { | |
909 | ret = -1; | |
910 | goto end; | |
911 | } | |
912 | ||
913 | offset += provider_name_len; | |
914 | } | |
915 | ||
916 | { | |
917 | const char *name; | |
918 | const struct lttng_buffer_view context_name_view = | |
28ab034a | 919 | lttng_buffer_view_from_view(&view->buffer, offset, context_name_len); |
26e1c61f JR |
920 | |
921 | if (!lttng_buffer_view_is_valid(&context_name_view)) { | |
922 | ret = -1; | |
923 | goto end; | |
924 | } | |
925 | ||
926 | name = context_name_view.data; | |
927 | ||
28ab034a | 928 | if (!lttng_buffer_view_contains_string(&context_name_view, name, context_name_len)) { |
26e1c61f JR |
929 | ret = -1; |
930 | goto end; | |
931 | } | |
932 | ||
933 | context_name = lttng_strndup(name, context_name_len); | |
934 | if (!context_name) { | |
935 | ret = -1; | |
936 | goto end; | |
937 | } | |
938 | ||
939 | offset += context_name_len; | |
940 | } | |
941 | ||
942 | /* Transfer ownership of the strings */ | |
943 | event_ctx->u.app_ctx.provider_name = provider_name; | |
944 | event_ctx->u.app_ctx.ctx_name = context_name; | |
cd9adb8b JG |
945 | provider_name = nullptr; |
946 | context_name = nullptr; | |
26e1c61f JR |
947 | |
948 | ret = offset; | |
949 | end: | |
950 | free(provider_name); | |
951 | free(context_name); | |
952 | ||
953 | return ret; | |
954 | } | |
955 | ||
28ab034a JG |
956 | static ssize_t |
957 | lttng_event_context_perf_counter_populate_from_payload(const struct lttng_payload_view *view, | |
958 | struct lttng_event_context *event_ctx) | |
26e1c61f | 959 | { |
531e96a7 JR |
960 | int ret; |
961 | ssize_t consumed, offset = 0; | |
26e1c61f JR |
962 | const struct lttng_event_context_perf_counter_comm *comm; |
963 | size_t name_len; | |
28ab034a JG |
964 | const struct lttng_buffer_view comm_view = |
965 | lttng_buffer_view_from_view(&view->buffer, offset, sizeof(*comm)); | |
26e1c61f JR |
966 | |
967 | assert(event_ctx->ctx == LTTNG_EVENT_CONTEXT_PERF_COUNTER || | |
28ab034a JG |
968 | event_ctx->ctx == LTTNG_EVENT_CONTEXT_PERF_THREAD_COUNTER || |
969 | event_ctx->ctx == LTTNG_EVENT_CONTEXT_PERF_CPU_COUNTER); | |
26e1c61f JR |
970 | |
971 | if (!lttng_buffer_view_is_valid(&comm_view)) { | |
531e96a7 | 972 | consumed = -1; |
26e1c61f JR |
973 | goto end; |
974 | } | |
975 | ||
976 | comm = (typeof(comm)) comm_view.data; | |
977 | offset += sizeof(*comm); | |
978 | ||
979 | name_len = comm->name_len; | |
980 | ||
981 | { | |
982 | const char *name; | |
983 | const struct lttng_buffer_view provider_name_view = | |
28ab034a | 984 | lttng_buffer_view_from_view(&view->buffer, offset, name_len); |
26e1c61f JR |
985 | |
986 | if (!lttng_buffer_view_is_valid(&provider_name_view)) { | |
531e96a7 | 987 | consumed = -1; |
26e1c61f JR |
988 | goto end; |
989 | } | |
990 | ||
991 | name = provider_name_view.data; | |
992 | ||
28ab034a | 993 | if (!lttng_buffer_view_contains_string(&provider_name_view, name, name_len)) { |
531e96a7 | 994 | consumed = -1; |
26e1c61f JR |
995 | goto end; |
996 | } | |
997 | ||
28ab034a JG |
998 | ret = lttng_strncpy(event_ctx->u.perf_counter.name, |
999 | name, | |
1000 | sizeof(event_ctx->u.perf_counter.name)); | |
531e96a7 JR |
1001 | if (ret) { |
1002 | consumed = -1; | |
1003 | goto end; | |
1004 | } | |
26e1c61f JR |
1005 | offset += name_len; |
1006 | } | |
1007 | ||
1008 | event_ctx->u.perf_counter.config = comm->config; | |
1009 | event_ctx->u.perf_counter.type = comm->type; | |
1010 | ||
531e96a7 | 1011 | consumed = offset; |
26e1c61f JR |
1012 | |
1013 | end: | |
531e96a7 | 1014 | return consumed; |
26e1c61f JR |
1015 | } |
1016 | ||
28ab034a JG |
1017 | ssize_t lttng_event_context_create_from_payload(struct lttng_payload_view *view, |
1018 | struct lttng_event_context **event_ctx) | |
26e1c61f JR |
1019 | { |
1020 | ssize_t ret, offset = 0; | |
1021 | const struct lttng_event_context_comm *comm; | |
cd9adb8b | 1022 | struct lttng_event_context *local_context = nullptr; |
28ab034a JG |
1023 | struct lttng_buffer_view comm_view = |
1024 | lttng_buffer_view_from_view(&view->buffer, offset, sizeof(*comm)); | |
26e1c61f JR |
1025 | |
1026 | assert(event_ctx); | |
1027 | assert(view); | |
1028 | ||
1029 | if (!lttng_buffer_view_is_valid(&comm_view)) { | |
1030 | ret = -1; | |
1031 | goto end; | |
1032 | } | |
1033 | ||
1034 | comm = (typeof(comm)) comm_view.data; | |
1035 | offset += sizeof(*comm); | |
1036 | ||
64803277 | 1037 | local_context = zmalloc<lttng_event_context>(); |
26e1c61f JR |
1038 | if (!local_context) { |
1039 | ret = -1; | |
1040 | goto end; | |
1041 | } | |
1042 | ||
1043 | local_context->ctx = (lttng_event_context_type) comm->type; | |
1044 | ||
1045 | { | |
1046 | struct lttng_payload_view subtype_view = | |
28ab034a | 1047 | lttng_payload_view_from_view(view, offset, -1); |
26e1c61f JR |
1048 | |
1049 | switch (local_context->ctx) { | |
1050 | case LTTNG_EVENT_CONTEXT_APP_CONTEXT: | |
28ab034a JG |
1051 | ret = lttng_event_context_app_populate_from_payload(&subtype_view, |
1052 | local_context); | |
26e1c61f JR |
1053 | break; |
1054 | case LTTNG_EVENT_CONTEXT_PERF_COUNTER: | |
1055 | case LTTNG_EVENT_CONTEXT_PERF_THREAD_COUNTER: | |
1056 | case LTTNG_EVENT_CONTEXT_PERF_CPU_COUNTER: | |
28ab034a JG |
1057 | ret = lttng_event_context_perf_counter_populate_from_payload(&subtype_view, |
1058 | local_context); | |
26e1c61f JR |
1059 | break; |
1060 | default: | |
1061 | /* Nothing else to deserialize. */ | |
1062 | ret = 0; | |
1063 | break; | |
1064 | } | |
1065 | } | |
1066 | ||
1067 | if (ret < 0) { | |
1068 | goto end; | |
1069 | } | |
1070 | ||
1071 | offset += ret; | |
1072 | ||
1073 | *event_ctx = local_context; | |
cd9adb8b | 1074 | local_context = nullptr; |
26e1c61f JR |
1075 | ret = offset; |
1076 | ||
1077 | end: | |
1078 | free(local_context); | |
1079 | return ret; | |
1080 | } | |
1081 | ||
28ab034a JG |
1082 | static int lttng_event_context_app_serialize(struct lttng_event_context *context, |
1083 | struct lttng_payload *payload) | |
26e1c61f JR |
1084 | { |
1085 | int ret; | |
1c9a0b0e | 1086 | struct lttng_event_context_app_comm comm = {}; |
26e1c61f JR |
1087 | size_t provider_len, ctx_len; |
1088 | const char *provider_name; | |
1089 | const char *ctx_name; | |
1090 | ||
1091 | assert(payload); | |
1092 | assert(context); | |
1093 | assert(context->ctx == LTTNG_EVENT_CONTEXT_APP_CONTEXT); | |
1094 | ||
1095 | provider_name = context->u.app_ctx.provider_name; | |
1096 | ctx_name = context->u.app_ctx.ctx_name; | |
1097 | ||
1098 | if (!provider_name || !ctx_name) { | |
1099 | ret = -LTTNG_ERR_INVALID; | |
1100 | goto end; | |
1101 | } | |
1102 | ||
1103 | provider_len = strlen(provider_name); | |
1104 | if (provider_len == 0) { | |
1105 | ret = -LTTNG_ERR_INVALID; | |
1106 | goto end; | |
1107 | } | |
1108 | ||
1109 | /* Include the null terminator. */ | |
f4f239b3 JR |
1110 | provider_len += 1; |
1111 | comm.provider_name_len = provider_len; | |
26e1c61f JR |
1112 | |
1113 | ctx_len = strlen(ctx_name); | |
1114 | if (ctx_len == 0) { | |
1115 | ret = -LTTNG_ERR_INVALID; | |
1116 | goto end; | |
1117 | } | |
1118 | ||
1119 | /* Include the null terminator. */ | |
f4f239b3 JR |
1120 | ctx_len += 1; |
1121 | comm.ctx_name_len = ctx_len; | |
26e1c61f JR |
1122 | |
1123 | /* Header */ | |
28ab034a | 1124 | ret = lttng_dynamic_buffer_append(&payload->buffer, &comm, sizeof(comm)); |
26e1c61f JR |
1125 | if (ret) { |
1126 | ret = -1; | |
1127 | goto end; | |
1128 | } | |
1129 | ||
28ab034a | 1130 | ret = lttng_dynamic_buffer_append(&payload->buffer, provider_name, provider_len); |
26e1c61f JR |
1131 | if (ret) { |
1132 | ret = -1; | |
1133 | goto end; | |
1134 | } | |
1135 | ||
28ab034a | 1136 | ret = lttng_dynamic_buffer_append(&payload->buffer, ctx_name, ctx_len); |
26e1c61f JR |
1137 | if (ret) { |
1138 | ret = -1; | |
1139 | goto end; | |
1140 | } | |
1141 | ||
1142 | end: | |
1143 | return ret; | |
1144 | } | |
1145 | ||
28ab034a JG |
1146 | static int lttng_event_context_perf_counter_serialize(struct lttng_event_perf_counter_ctx *context, |
1147 | struct lttng_payload *payload) | |
26e1c61f JR |
1148 | { |
1149 | int ret; | |
1c9a0b0e | 1150 | struct lttng_event_context_perf_counter_comm comm = {}; |
26e1c61f JR |
1151 | |
1152 | assert(payload); | |
1153 | assert(context); | |
1154 | ||
1155 | comm.config = context->config; | |
1156 | comm.type = context->type; | |
2d6df81a | 1157 | comm.name_len = lttng_strnlen(context->name, sizeof(context->name)); |
26e1c61f | 1158 | |
2d6df81a | 1159 | if (comm.name_len == sizeof(context->name)) { |
26e1c61f JR |
1160 | ret = -1; |
1161 | goto end; | |
1162 | } | |
1163 | ||
1164 | /* Include the null terminator. */ | |
1165 | comm.name_len += 1; | |
1166 | ||
1167 | /* Header */ | |
28ab034a | 1168 | ret = lttng_dynamic_buffer_append(&payload->buffer, &comm, sizeof(comm)); |
26e1c61f JR |
1169 | if (ret) { |
1170 | ret = -1; | |
1171 | goto end; | |
1172 | } | |
1173 | ||
28ab034a | 1174 | ret = lttng_dynamic_buffer_append(&payload->buffer, context->name, comm.name_len); |
26e1c61f JR |
1175 | if (ret) { |
1176 | ret = -1; | |
1177 | goto end; | |
1178 | } | |
1179 | ||
1180 | end: | |
1181 | return ret; | |
1182 | } | |
1183 | ||
1184 | int lttng_event_context_serialize(struct lttng_event_context *context, | |
28ab034a | 1185 | struct lttng_payload *payload) |
26e1c61f JR |
1186 | { |
1187 | int ret; | |
fa9870ce JG |
1188 | struct lttng_event_context_comm context_comm; |
1189 | ||
1190 | context_comm.type = 0; | |
26e1c61f JR |
1191 | |
1192 | assert(context); | |
1193 | assert(payload); | |
1194 | ||
1195 | context_comm.type = (uint32_t) context->ctx; | |
1196 | ||
1197 | /* Header */ | |
28ab034a | 1198 | ret = lttng_dynamic_buffer_append(&payload->buffer, &context_comm, sizeof(context_comm)); |
26e1c61f JR |
1199 | if (ret) { |
1200 | goto end; | |
1201 | } | |
1202 | ||
1203 | switch (context->ctx) { | |
1204 | case LTTNG_EVENT_CONTEXT_APP_CONTEXT: | |
1205 | ret = lttng_event_context_app_serialize(context, payload); | |
1206 | break; | |
1207 | case LTTNG_EVENT_CONTEXT_PERF_COUNTER: | |
1208 | case LTTNG_EVENT_CONTEXT_PERF_THREAD_COUNTER: | |
1209 | case LTTNG_EVENT_CONTEXT_PERF_CPU_COUNTER: | |
28ab034a | 1210 | ret = lttng_event_context_perf_counter_serialize(&context->u.perf_counter, payload); |
26e1c61f JR |
1211 | break; |
1212 | default: | |
1213 | /* Nothing else to serialize. */ | |
1214 | break; | |
1215 | } | |
1216 | ||
1217 | if (ret) { | |
1218 | goto end; | |
1219 | } | |
1220 | ||
1221 | end: | |
1222 | return ret; | |
1223 | } | |
1224 | ||
1225 | void lttng_event_context_destroy(struct lttng_event_context *context) | |
1226 | { | |
1227 | if (!context) { | |
1228 | return; | |
1229 | } | |
1230 | ||
1231 | if (context->ctx == LTTNG_EVENT_CONTEXT_APP_CONTEXT) { | |
1232 | free(context->u.app_ctx.provider_name); | |
1233 | free(context->u.app_ctx.ctx_name); | |
1234 | } | |
1235 | ||
1236 | free(context); | |
1237 | } | |
1238 | ||
b2d68839 JR |
1239 | /* |
1240 | * This is a specialized populate for lttng_event_field since it ignores | |
1241 | * the extension field of the lttng_event struct and simply copies what it can | |
1242 | * to the internal struct lttng_event of a lttng_event_field. | |
1243 | */ | |
28ab034a JG |
1244 | static void lttng_event_field_populate_lttng_event_from_event(const struct lttng_event *src, |
1245 | struct lttng_event *destination) | |
b2d68839 JR |
1246 | { |
1247 | memcpy(destination, src, sizeof(*destination)); | |
1248 | ||
1249 | /* Remove all possible dynamic data from the destination event rule. */ | |
cd9adb8b | 1250 | destination->extended.ptr = nullptr; |
b2d68839 JR |
1251 | } |
1252 | ||
28ab034a JG |
1253 | ssize_t lttng_event_field_create_from_payload(struct lttng_payload_view *view, |
1254 | struct lttng_event_field **field) | |
b2d68839 JR |
1255 | { |
1256 | ssize_t ret, offset = 0; | |
cd9adb8b JG |
1257 | struct lttng_event_field *local_event_field = nullptr; |
1258 | struct lttng_event *event = nullptr; | |
b2d68839 | 1259 | const struct lttng_event_field_comm *comm; |
cd9adb8b | 1260 | const char *name = nullptr; |
b2d68839 JR |
1261 | |
1262 | assert(field); | |
1263 | assert(view); | |
1264 | ||
1265 | { | |
1266 | const struct lttng_buffer_view comm_view = | |
28ab034a | 1267 | lttng_buffer_view_from_view(&view->buffer, offset, sizeof(*comm)); |
b2d68839 JR |
1268 | |
1269 | if (!lttng_buffer_view_is_valid(&comm_view)) { | |
1270 | ret = -1; | |
1271 | goto end; | |
1272 | } | |
1273 | ||
1274 | /* lttng_event_field_comm header */ | |
1275 | comm = (const lttng_event_field_comm *) comm_view.data; | |
1276 | offset += sizeof(*comm); | |
1277 | } | |
1278 | ||
64803277 | 1279 | local_event_field = zmalloc<lttng_event_field>(); |
b2d68839 JR |
1280 | if (!local_event_field) { |
1281 | ret = -1; | |
1282 | goto end; | |
1283 | } | |
1284 | ||
1285 | local_event_field->type = (lttng_event_field_type) comm->type; | |
1286 | local_event_field->nowrite = comm->nowrite; | |
1287 | ||
1288 | /* Field name */ | |
1289 | { | |
1290 | const struct lttng_buffer_view name_view = | |
28ab034a | 1291 | lttng_buffer_view_from_view(&view->buffer, offset, comm->name_len); |
b2d68839 JR |
1292 | |
1293 | if (!lttng_buffer_view_is_valid(&name_view)) { | |
1294 | ret = -1; | |
1295 | goto end; | |
1296 | } | |
1297 | ||
1298 | name = name_view.data; | |
1299 | ||
28ab034a | 1300 | if (!lttng_buffer_view_contains_string(&name_view, name_view.data, comm->name_len)) { |
b2d68839 JR |
1301 | ret = -1; |
1302 | goto end; | |
1303 | } | |
1304 | ||
1305 | if (comm->name_len > LTTNG_SYMBOL_NAME_LEN - 1) { | |
1306 | /* Name is too long.*/ | |
1307 | ret = -1; | |
1308 | goto end; | |
1309 | } | |
1310 | ||
1311 | offset += comm->name_len; | |
1312 | } | |
1313 | ||
1314 | /* Event */ | |
1315 | { | |
1316 | struct lttng_payload_view event_view = | |
28ab034a | 1317 | lttng_payload_view_from_view(view, offset, comm->event_len); |
b2d68839 JR |
1318 | |
1319 | if (!lttng_payload_view_is_valid(&event_view)) { | |
1320 | ret = -1; | |
1321 | goto end; | |
1322 | } | |
1323 | ||
cd9adb8b JG |
1324 | ret = lttng_event_create_from_payload( |
1325 | &event_view, &event, nullptr, nullptr, nullptr); | |
b2d68839 JR |
1326 | if (ret != comm->event_len) { |
1327 | ret = -1; | |
1328 | goto end; | |
1329 | } | |
1330 | ||
1331 | offset += ret; | |
1332 | } | |
1333 | ||
1334 | assert(name); | |
1335 | assert(event); | |
1336 | ||
28ab034a JG |
1337 | if (lttng_strncpy( |
1338 | local_event_field->field_name, name, sizeof(local_event_field->field_name))) { | |
b2d68839 JR |
1339 | ret = -1; |
1340 | goto end; | |
1341 | } | |
1342 | ||
28ab034a | 1343 | lttng_event_field_populate_lttng_event_from_event(event, &local_event_field->event); |
b2d68839 JR |
1344 | |
1345 | *field = local_event_field; | |
cd9adb8b | 1346 | local_event_field = nullptr; |
b2d68839 JR |
1347 | ret = offset; |
1348 | end: | |
1349 | lttng_event_destroy(event); | |
1350 | free(local_event_field); | |
1351 | return ret; | |
1352 | } | |
1353 | ||
1354 | int lttng_event_field_serialize(const struct lttng_event_field *field, | |
28ab034a | 1355 | struct lttng_payload *payload) |
b2d68839 JR |
1356 | { |
1357 | int ret; | |
1358 | size_t header_offset, size_before_event; | |
1359 | size_t name_len; | |
1c9a0b0e | 1360 | struct lttng_event_field_comm event_field_comm = {}; |
b2d68839 JR |
1361 | struct lttng_event_field_comm *header; |
1362 | ||
1363 | assert(field); | |
1364 | assert(payload); | |
1365 | ||
1366 | /* Save the header location for later in-place header update. */ | |
1367 | header_offset = payload->buffer.size; | |
1368 | ||
2d6df81a JG |
1369 | name_len = strnlen(field->field_name, sizeof(field->field_name)); |
1370 | if (name_len == sizeof(field->field_name)) { | |
b2d68839 JR |
1371 | /* Event name is not NULL-terminated. */ |
1372 | ret = -1; | |
1373 | goto end; | |
1374 | } | |
1375 | ||
1376 | /* Add null termination. */ | |
1377 | name_len += 1; | |
1378 | ||
1379 | event_field_comm.type = field->type; | |
28ab034a | 1380 | event_field_comm.nowrite = (uint8_t) field->nowrite; |
b2d68839 JR |
1381 | event_field_comm.name_len = name_len; |
1382 | ||
1383 | /* Header */ | |
1384 | ret = lttng_dynamic_buffer_append( | |
28ab034a | 1385 | &payload->buffer, &event_field_comm, sizeof(event_field_comm)); |
b2d68839 JR |
1386 | if (ret) { |
1387 | goto end; | |
1388 | } | |
1389 | ||
1390 | /* Field name */ | |
28ab034a | 1391 | ret = lttng_dynamic_buffer_append(&payload->buffer, field->field_name, name_len); |
b2d68839 JR |
1392 | if (ret) { |
1393 | goto end; | |
1394 | } | |
1395 | ||
1396 | size_before_event = payload->buffer.size; | |
cd9adb8b | 1397 | ret = lttng_event_serialize(&field->event, 0, nullptr, nullptr, 0, nullptr, payload); |
b2d68839 JR |
1398 | if (ret) { |
1399 | ret = -1; | |
1400 | goto end; | |
1401 | } | |
1402 | ||
1403 | /* Update the event len. */ | |
28ab034a | 1404 | header = (struct lttng_event_field_comm *) ((char *) payload->buffer.data + header_offset); |
b2d68839 JR |
1405 | header->event_len = payload->buffer.size - size_before_event; |
1406 | ||
1407 | end: | |
1408 | return ret; | |
1409 | } | |
1410 | ||
28ab034a JG |
1411 | static enum lttng_error_code compute_flattened_size(struct lttng_dynamic_pointer_array *events, |
1412 | size_t *size) | |
8ddd72ef JR |
1413 | { |
1414 | enum lttng_error_code ret_code; | |
1415 | int ret = 0; | |
1416 | size_t storage_req, event_count, i; | |
1417 | ||
1418 | assert(size); | |
1419 | assert(events); | |
1420 | ||
1421 | event_count = lttng_dynamic_pointer_array_get_count(events); | |
1422 | ||
1423 | /* The basic struct lttng_event */ | |
1424 | storage_req = event_count * sizeof(struct lttng_event); | |
1425 | ||
fc33156e JG |
1426 | /* The struct·lttng_event_extended */ |
1427 | storage_req += event_count * sizeof(struct lttng_event_extended); | |
1428 | ||
8ddd72ef JR |
1429 | for (i = 0; i < event_count; i++) { |
1430 | int probe_storage_req = 0; | |
28ab034a JG |
1431 | const struct event_list_element *element = |
1432 | (const struct event_list_element *) lttng_dynamic_pointer_array_get_pointer( | |
1433 | events, i); | |
cd9adb8b | 1434 | const struct lttng_userspace_probe_location *location = nullptr; |
8ddd72ef | 1435 | |
28ab034a | 1436 | location = lttng_event_get_userspace_probe_location(element->event); |
8ddd72ef | 1437 | if (location) { |
cd9adb8b | 1438 | ret = lttng_userspace_probe_location_flatten(location, nullptr); |
8ddd72ef JR |
1439 | if (ret < 0) { |
1440 | ret_code = LTTNG_ERR_PROBE_LOCATION_INVAL; | |
1441 | goto end; | |
1442 | } | |
1443 | ||
1444 | probe_storage_req = ret; | |
1445 | } | |
1446 | ||
8ddd72ef JR |
1447 | if (element->filter_expression) { |
1448 | storage_req += strlen(element->filter_expression) + 1; | |
1449 | } | |
1450 | ||
1451 | if (element->exclusions) { | |
28ab034a | 1452 | storage_req += element->exclusions->count * LTTNG_SYMBOL_NAME_LEN; |
8ddd72ef JR |
1453 | } |
1454 | ||
1455 | /* Padding to ensure the flat probe is aligned. */ | |
1456 | storage_req = lttng_align_ceil(storage_req, sizeof(uint64_t)); | |
1457 | storage_req += probe_storage_req; | |
1458 | } | |
1459 | ||
1460 | *size = storage_req; | |
1461 | ret_code = LTTNG_OK; | |
1462 | ||
1463 | end: | |
1464 | return ret_code; | |
1465 | } | |
1466 | ||
1467 | /* | |
1468 | * Flatten a list of struct lttng_event. | |
1469 | * | |
1470 | * The buffer that is returned to the API client must contain a "flat" version | |
1471 | * of the events that are returned. In other words, all pointers within an | |
1472 | * lttng_event must point to a location within the returned buffer so that the | |
1473 | * user may free everything by simply calling free() on the returned buffer. | |
1474 | * This is needed in order to maintain API compatibility. | |
1475 | * | |
1476 | * A first pass is performed to compute the size of the buffer that must be | |
1477 | * allocated. A second pass is then performed to setup the returned events so | |
1478 | * that their members always point within the buffer. | |
1479 | * | |
1480 | * The layout of the returned buffer is as follows: | |
1481 | * - struct lttng_event[nb_events], | |
1482 | * - nb_events times the following: | |
1483 | * - struct lttng_event_extended, | |
1484 | * - filter_expression | |
1485 | * - exclusions | |
1486 | * - padding to align to 64-bits | |
1487 | * - flattened version of userspace_probe_location | |
1488 | */ | |
28ab034a JG |
1489 | static enum lttng_error_code flatten_lttng_events(struct lttng_dynamic_pointer_array *events, |
1490 | struct lttng_event **flattened_events) | |
8ddd72ef JR |
1491 | { |
1492 | enum lttng_error_code ret_code; | |
1493 | int ret, i; | |
1494 | size_t storage_req; | |
1495 | struct lttng_dynamic_buffer local_flattened_events; | |
1496 | int nb_events; | |
1497 | ||
1498 | assert(events); | |
1499 | assert(flattened_events); | |
1500 | ||
1501 | lttng_dynamic_buffer_init(&local_flattened_events); | |
1502 | nb_events = lttng_dynamic_pointer_array_get_count(events); | |
1503 | ||
1504 | ret_code = compute_flattened_size(events, &storage_req); | |
1505 | if (ret_code != LTTNG_OK) { | |
1506 | goto end; | |
1507 | } | |
1508 | ||
1509 | /* | |
1510 | * We must ensure that "local_flattened_events" is never resized so as | |
1511 | * to preserve the validity of the flattened objects. | |
1512 | */ | |
28ab034a | 1513 | ret = lttng_dynamic_buffer_set_capacity(&local_flattened_events, storage_req); |
8ddd72ef JR |
1514 | if (ret) { |
1515 | ret_code = LTTNG_ERR_NOMEM; | |
1516 | goto end; | |
1517 | } | |
1518 | ||
1519 | /* Start by laying the struct lttng_event */ | |
1520 | for (i = 0; i < nb_events; i++) { | |
28ab034a JG |
1521 | const struct event_list_element *element = |
1522 | (const struct event_list_element *) lttng_dynamic_pointer_array_get_pointer( | |
1523 | events, i); | |
8ddd72ef JR |
1524 | |
1525 | if (!element) { | |
1526 | ret_code = LTTNG_ERR_FATAL; | |
1527 | goto end; | |
1528 | } | |
1529 | ||
28ab034a JG |
1530 | ret = lttng_dynamic_buffer_append( |
1531 | &local_flattened_events, element->event, sizeof(struct lttng_event)); | |
8ddd72ef JR |
1532 | if (ret) { |
1533 | ret_code = LTTNG_ERR_NOMEM; | |
1534 | goto end; | |
1535 | } | |
1536 | } | |
1537 | ||
1538 | for (i = 0; i < nb_events; i++) { | |
28ab034a JG |
1539 | const struct event_list_element *element = |
1540 | (const struct event_list_element *) lttng_dynamic_pointer_array_get_pointer( | |
1541 | events, i); | |
1542 | struct lttng_event *event = | |
1543 | (struct lttng_event *) (local_flattened_events.data + | |
1544 | (sizeof(struct lttng_event) * i)); | |
8ddd72ef | 1545 | struct lttng_event_extended *event_extended = |
28ab034a JG |
1546 | (struct lttng_event_extended *) (local_flattened_events.data + |
1547 | local_flattened_events.size); | |
cd9adb8b | 1548 | const struct lttng_userspace_probe_location *location = nullptr; |
8ddd72ef JR |
1549 | |
1550 | assert(element); | |
1551 | ||
1552 | /* Insert struct lttng_event_extended. */ | |
1553 | ret = lttng_dynamic_buffer_set_size(&local_flattened_events, | |
28ab034a JG |
1554 | local_flattened_events.size + |
1555 | sizeof(*event_extended)); | |
8ddd72ef JR |
1556 | if (ret) { |
1557 | ret_code = LTTNG_ERR_NOMEM; | |
1558 | goto end; | |
1559 | } | |
1560 | event->extended.ptr = event_extended; | |
1561 | ||
1562 | /* Insert filter expression. */ | |
1563 | if (element->filter_expression) { | |
1564 | const size_t len = strlen(element->filter_expression) + 1; | |
1565 | ||
1566 | event_extended->filter_expression = | |
28ab034a | 1567 | local_flattened_events.data + local_flattened_events.size; |
8ddd72ef | 1568 | ret = lttng_dynamic_buffer_append( |
28ab034a | 1569 | &local_flattened_events, element->filter_expression, len); |
8ddd72ef JR |
1570 | if (ret) { |
1571 | ret_code = LTTNG_ERR_NOMEM; | |
1572 | goto end; | |
1573 | } | |
1574 | } | |
1575 | ||
1576 | /* Insert exclusions. */ | |
1577 | if (element->exclusions) { | |
28ab034a | 1578 | event_extended->exclusions.count = element->exclusions->count; |
8ddd72ef | 1579 | event_extended->exclusions.strings = |
28ab034a | 1580 | local_flattened_events.data + local_flattened_events.size; |
8ddd72ef | 1581 | |
28ab034a JG |
1582 | ret = lttng_dynamic_buffer_append(&local_flattened_events, |
1583 | element->exclusions->names, | |
1584 | element->exclusions->count * | |
1585 | LTTNG_SYMBOL_NAME_LEN); | |
8ddd72ef JR |
1586 | if (ret) { |
1587 | ret_code = LTTNG_ERR_NOMEM; | |
1588 | goto end; | |
1589 | } | |
1590 | } | |
1591 | ||
1592 | /* Insert padding to align to 64-bits. */ | |
1593 | ret = lttng_dynamic_buffer_set_size(&local_flattened_events, | |
28ab034a JG |
1594 | lttng_align_ceil(local_flattened_events.size, |
1595 | sizeof(uint64_t))); | |
8ddd72ef JR |
1596 | if (ret) { |
1597 | ret_code = LTTNG_ERR_NOMEM; | |
1598 | goto end; | |
1599 | } | |
1600 | ||
28ab034a | 1601 | location = lttng_event_get_userspace_probe_location(element->event); |
8ddd72ef | 1602 | if (location) { |
28ab034a JG |
1603 | event_extended->probe_location = (struct lttng_userspace_probe_location |
1604 | *) (local_flattened_events.data + | |
1605 | local_flattened_events.size); | |
1606 | ret = lttng_userspace_probe_location_flatten(location, | |
1607 | &local_flattened_events); | |
8ddd72ef JR |
1608 | if (ret < 0) { |
1609 | ret_code = LTTNG_ERR_PROBE_LOCATION_INVAL; | |
1610 | goto end; | |
1611 | } | |
1612 | } | |
1613 | } | |
1614 | ||
1615 | /* Don't reset local_flattened_events buffer as we return its content. */ | |
1616 | *flattened_events = (struct lttng_event *) local_flattened_events.data; | |
1617 | lttng_dynamic_buffer_init(&local_flattened_events); | |
1618 | ret_code = LTTNG_OK; | |
1619 | end: | |
1620 | lttng_dynamic_buffer_reset(&local_flattened_events); | |
1621 | return ret_code; | |
1622 | } | |
1623 | ||
28ab034a JG |
1624 | static enum lttng_error_code |
1625 | event_list_create_from_payload(struct lttng_payload_view *view, | |
1626 | unsigned int count, | |
1627 | struct lttng_dynamic_pointer_array *event_list) | |
8ddd72ef JR |
1628 | { |
1629 | enum lttng_error_code ret_code; | |
1630 | int ret; | |
1631 | unsigned int i; | |
1632 | int offset = 0; | |
1633 | ||
1634 | assert(view); | |
1635 | assert(event_list); | |
1636 | ||
1637 | for (i = 0; i < count; i++) { | |
1638 | ssize_t event_size; | |
1639 | struct lttng_payload_view event_view = | |
28ab034a | 1640 | lttng_payload_view_from_view(view, offset, -1); |
64803277 | 1641 | struct event_list_element *element = zmalloc<event_list_element>(); |
8ddd72ef JR |
1642 | |
1643 | if (!element) { | |
1644 | ret_code = LTTNG_ERR_NOMEM; | |
1645 | goto end; | |
1646 | } | |
1647 | ||
1648 | /* | |
1649 | * Lifetime and management of the object is now bound to the | |
1650 | * array. | |
1651 | */ | |
28ab034a | 1652 | ret = lttng_dynamic_pointer_array_add_pointer(event_list, element); |
8ddd72ef JR |
1653 | if (ret) { |
1654 | event_list_destructor(element); | |
1655 | ret_code = LTTNG_ERR_NOMEM; | |
1656 | goto end; | |
1657 | } | |
1658 | ||
1659 | /* | |
1660 | * Bytecode is not transmitted on listing in any case we do not | |
1661 | * care about it. | |
1662 | */ | |
1663 | event_size = lttng_event_create_from_payload(&event_view, | |
28ab034a JG |
1664 | &element->event, |
1665 | &element->exclusions, | |
1666 | &element->filter_expression, | |
cd9adb8b | 1667 | nullptr); |
8ddd72ef JR |
1668 | if (event_size < 0) { |
1669 | ret_code = LTTNG_ERR_INVALID; | |
1670 | goto end; | |
1671 | } | |
1672 | ||
1673 | offset += event_size; | |
1674 | } | |
1675 | ||
1676 | if (view->buffer.size != offset) { | |
1677 | ret_code = LTTNG_ERR_INVALID_PROTOCOL; | |
1678 | goto end; | |
1679 | } | |
1680 | ||
1681 | ret_code = LTTNG_OK; | |
1682 | ||
1683 | end: | |
1684 | return ret_code; | |
1685 | } | |
1686 | ||
1687 | enum lttng_error_code lttng_events_create_and_flatten_from_payload( | |
28ab034a | 1688 | struct lttng_payload_view *payload, unsigned int count, struct lttng_event **events) |
8ddd72ef JR |
1689 | { |
1690 | enum lttng_error_code ret = LTTNG_OK; | |
1691 | struct lttng_dynamic_pointer_array local_events; | |
1692 | ||
1693 | lttng_dynamic_pointer_array_init(&local_events, event_list_destructor); | |
1694 | ||
1695 | /* Deserialize the events. */ | |
1696 | { | |
1697 | struct lttng_payload_view events_view = | |
28ab034a | 1698 | lttng_payload_view_from_view(payload, 0, -1); |
8ddd72ef | 1699 | |
28ab034a | 1700 | ret = event_list_create_from_payload(&events_view, count, &local_events); |
8ddd72ef JR |
1701 | if (ret != LTTNG_OK) { |
1702 | goto end; | |
1703 | } | |
1704 | } | |
1705 | ||
1706 | ret = flatten_lttng_events(&local_events, events); | |
1707 | if (ret != LTTNG_OK) { | |
1708 | goto end; | |
1709 | } | |
1710 | ||
1711 | end: | |
1712 | lttng_dynamic_pointer_array_reset(&local_events); | |
1713 | return ret; | |
1714 | } | |
b2d68839 | 1715 | |
28ab034a JG |
1716 | static enum lttng_error_code |
1717 | flatten_lttng_event_fields(struct lttng_dynamic_pointer_array *event_fields, | |
1718 | struct lttng_event_field **flattened_event_fields) | |
b2d68839 JR |
1719 | { |
1720 | int ret, i; | |
1721 | enum lttng_error_code ret_code; | |
1722 | size_t storage_req = 0; | |
1723 | struct lttng_dynamic_buffer local_flattened_event_fields; | |
1724 | int nb_event_field; | |
1725 | ||
1726 | assert(event_fields); | |
1727 | assert(flattened_event_fields); | |
1728 | ||
1729 | lttng_dynamic_buffer_init(&local_flattened_event_fields); | |
1730 | nb_event_field = lttng_dynamic_pointer_array_get_count(event_fields); | |
1731 | ||
1732 | /* | |
1733 | * Here even if the event field contains a `struct lttng_event` that | |
1734 | * could contain dynamic data, in reality it is not the case. | |
1735 | * Dynamic data is not present. Here the flattening is mostly a direct | |
1736 | * memcpy. This is less than ideal but this code is still better than | |
1737 | * direct usage of an unpacked lttng_event_field array. | |
1738 | */ | |
1739 | storage_req += sizeof(struct lttng_event_field) * nb_event_field; | |
1740 | ||
1741 | lttng_dynamic_buffer_init(&local_flattened_event_fields); | |
1742 | ||
1743 | /* | |
1744 | * We must ensure that "local_flattened_event_fields" is never resized | |
1745 | * so as to preserve the validity of the flattened objects. | |
1746 | */ | |
28ab034a | 1747 | ret = lttng_dynamic_buffer_set_capacity(&local_flattened_event_fields, storage_req); |
b2d68839 JR |
1748 | if (ret) { |
1749 | ret_code = LTTNG_ERR_NOMEM; | |
1750 | goto end; | |
1751 | } | |
1752 | ||
1753 | for (i = 0; i < nb_event_field; i++) { | |
1754 | const struct lttng_event_field *element = | |
28ab034a JG |
1755 | (const struct lttng_event_field *) lttng_dynamic_pointer_array_get_pointer( |
1756 | event_fields, i); | |
b2d68839 JR |
1757 | |
1758 | if (!element) { | |
1759 | ret_code = LTTNG_ERR_FATAL; | |
1760 | goto end; | |
1761 | } | |
28ab034a JG |
1762 | ret = lttng_dynamic_buffer_append( |
1763 | &local_flattened_event_fields, element, sizeof(struct lttng_event_field)); | |
b2d68839 JR |
1764 | if (ret) { |
1765 | ret_code = LTTNG_ERR_NOMEM; | |
1766 | goto end; | |
1767 | } | |
1768 | } | |
1769 | ||
1770 | /* Don't reset local_flattened_channels buffer as we return its content. */ | |
1771 | *flattened_event_fields = (struct lttng_event_field *) local_flattened_event_fields.data; | |
1772 | lttng_dynamic_buffer_init(&local_flattened_event_fields); | |
1773 | ret_code = LTTNG_OK; | |
1774 | end: | |
1775 | lttng_dynamic_buffer_reset(&local_flattened_event_fields); | |
1776 | return ret_code; | |
1777 | } | |
1778 | ||
28ab034a JG |
1779 | static enum lttng_error_code |
1780 | event_field_list_create_from_payload(struct lttng_payload_view *view, | |
1781 | unsigned int count, | |
1782 | struct lttng_dynamic_pointer_array **event_field_list) | |
b2d68839 JR |
1783 | { |
1784 | enum lttng_error_code ret_code; | |
1785 | int ret, offset = 0; | |
1786 | unsigned int i; | |
cd9adb8b | 1787 | struct lttng_dynamic_pointer_array *list = nullptr; |
b2d68839 JR |
1788 | |
1789 | assert(view); | |
1790 | assert(event_field_list); | |
1791 | ||
64803277 | 1792 | list = zmalloc<lttng_dynamic_pointer_array>(); |
b2d68839 JR |
1793 | if (!list) { |
1794 | ret_code = LTTNG_ERR_NOMEM; | |
1795 | goto end; | |
1796 | } | |
1797 | ||
1798 | lttng_dynamic_pointer_array_init(list, free); | |
1799 | ||
1800 | for (i = 0; i < count; i++) { | |
1801 | ssize_t event_field_size; | |
cd9adb8b | 1802 | struct lttng_event_field *field = nullptr; |
b2d68839 | 1803 | struct lttng_payload_view event_field_view = |
28ab034a | 1804 | lttng_payload_view_from_view(view, offset, -1); |
b2d68839 | 1805 | |
28ab034a | 1806 | event_field_size = lttng_event_field_create_from_payload(&event_field_view, &field); |
b2d68839 JR |
1807 | if (event_field_size < 0) { |
1808 | ret_code = LTTNG_ERR_INVALID; | |
1809 | goto end; | |
1810 | } | |
1811 | ||
1812 | /* Lifetime and management of the object is now bound to the array. */ | |
1813 | ret = lttng_dynamic_pointer_array_add_pointer(list, field); | |
1814 | if (ret) { | |
1815 | free(field); | |
1816 | ret_code = LTTNG_ERR_NOMEM; | |
1817 | goto end; | |
1818 | } | |
1819 | ||
1820 | offset += event_field_size; | |
1821 | } | |
1822 | ||
1823 | if (view->buffer.size != offset) { | |
1824 | ret_code = LTTNG_ERR_INVALID; | |
1825 | goto end; | |
1826 | } | |
1827 | ||
1828 | *event_field_list = list; | |
cd9adb8b | 1829 | list = nullptr; |
b2d68839 JR |
1830 | ret_code = LTTNG_OK; |
1831 | ||
1832 | end: | |
1833 | if (list) { | |
1834 | lttng_dynamic_pointer_array_reset(list); | |
1835 | free(list); | |
1836 | } | |
1837 | ||
1838 | return ret_code; | |
1839 | } | |
1840 | ||
1841 | enum lttng_error_code lttng_event_fields_create_and_flatten_from_payload( | |
28ab034a | 1842 | struct lttng_payload_view *view, unsigned int count, struct lttng_event_field **fields) |
b2d68839 JR |
1843 | { |
1844 | enum lttng_error_code ret_code; | |
cd9adb8b | 1845 | struct lttng_dynamic_pointer_array *local_event_fields = nullptr; |
b2d68839 | 1846 | |
28ab034a | 1847 | ret_code = event_field_list_create_from_payload(view, count, &local_event_fields); |
b2d68839 JR |
1848 | if (ret_code != LTTNG_OK) { |
1849 | goto end; | |
1850 | } | |
1851 | ||
1852 | ret_code = flatten_lttng_event_fields(local_event_fields, fields); | |
1853 | if (ret_code != LTTNG_OK) { | |
1854 | goto end; | |
1855 | } | |
1856 | end: | |
1857 | if (local_event_fields) { | |
1858 | lttng_dynamic_pointer_array_reset(local_event_fields); | |
1859 | free(local_event_fields); | |
1860 | } | |
1861 | ||
1862 | return ret_code; | |
1863 | } |