| 1 | /* |
| 2 | * Copyright (C) 2018 Jérémie Galarneau <jeremie.galarneau@efficios.com> |
| 3 | * |
| 4 | * SPDX-License-Identifier: LGPL-2.1-only |
| 5 | * |
| 6 | */ |
| 7 | |
| 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> |
| 15 | #include <common/error.h> |
| 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 | } |
| 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); |
| 70 | new_event = NULL; |
| 71 | goto end; |
| 72 | } |
| 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 | |
| 949 | static enum lttng_error_code compute_flattened_size( |
| 950 | struct lttng_dynamic_pointer_array *events, size_t *size) |
| 951 | { |
| 952 | enum lttng_error_code ret_code; |
| 953 | int ret = 0; |
| 954 | size_t storage_req, event_count, i; |
| 955 | |
| 956 | assert(size); |
| 957 | assert(events); |
| 958 | |
| 959 | event_count = lttng_dynamic_pointer_array_get_count(events); |
| 960 | |
| 961 | /* The basic struct lttng_event */ |
| 962 | storage_req = event_count * sizeof(struct lttng_event); |
| 963 | |
| 964 | for (i = 0; i < event_count; i++) { |
| 965 | int probe_storage_req = 0; |
| 966 | const struct event_list_element *element = |
| 967 | lttng_dynamic_pointer_array_get_pointer( |
| 968 | events, i); |
| 969 | const struct lttng_userspace_probe_location *location = NULL; |
| 970 | |
| 971 | location = lttng_event_get_userspace_probe_location( |
| 972 | element->event); |
| 973 | if (location) { |
| 974 | ret = lttng_userspace_probe_location_flatten( |
| 975 | location, NULL); |
| 976 | if (ret < 0) { |
| 977 | ret_code = LTTNG_ERR_PROBE_LOCATION_INVAL; |
| 978 | goto end; |
| 979 | } |
| 980 | |
| 981 | probe_storage_req = ret; |
| 982 | } |
| 983 | |
| 984 | /* The struct·lttng_event_extended */ |
| 985 | storage_req += event_count * |
| 986 | sizeof(struct lttng_event_extended); |
| 987 | |
| 988 | if (element->filter_expression) { |
| 989 | storage_req += strlen(element->filter_expression) + 1; |
| 990 | } |
| 991 | |
| 992 | if (element->exclusions) { |
| 993 | storage_req += element->exclusions->count * |
| 994 | LTTNG_SYMBOL_NAME_LEN; |
| 995 | } |
| 996 | |
| 997 | /* Padding to ensure the flat probe is aligned. */ |
| 998 | storage_req = ALIGN_TO(storage_req, sizeof(uint64_t)); |
| 999 | storage_req += probe_storage_req; |
| 1000 | } |
| 1001 | |
| 1002 | *size = storage_req; |
| 1003 | ret_code = LTTNG_OK; |
| 1004 | |
| 1005 | end: |
| 1006 | return ret_code; |
| 1007 | } |
| 1008 | |
| 1009 | /* |
| 1010 | * Flatten a list of struct lttng_event. |
| 1011 | * |
| 1012 | * The buffer that is returned to the API client must contain a "flat" version |
| 1013 | * of the events that are returned. In other words, all pointers within an |
| 1014 | * lttng_event must point to a location within the returned buffer so that the |
| 1015 | * user may free everything by simply calling free() on the returned buffer. |
| 1016 | * This is needed in order to maintain API compatibility. |
| 1017 | * |
| 1018 | * A first pass is performed to compute the size of the buffer that must be |
| 1019 | * allocated. A second pass is then performed to setup the returned events so |
| 1020 | * that their members always point within the buffer. |
| 1021 | * |
| 1022 | * The layout of the returned buffer is as follows: |
| 1023 | * - struct lttng_event[nb_events], |
| 1024 | * - nb_events times the following: |
| 1025 | * - struct lttng_event_extended, |
| 1026 | * - filter_expression |
| 1027 | * - exclusions |
| 1028 | * - padding to align to 64-bits |
| 1029 | * - flattened version of userspace_probe_location |
| 1030 | */ |
| 1031 | static enum lttng_error_code flatten_lttng_events( |
| 1032 | struct lttng_dynamic_pointer_array *events, |
| 1033 | struct lttng_event **flattened_events) |
| 1034 | { |
| 1035 | enum lttng_error_code ret_code; |
| 1036 | int ret, i; |
| 1037 | size_t storage_req; |
| 1038 | struct lttng_dynamic_buffer local_flattened_events; |
| 1039 | int nb_events; |
| 1040 | |
| 1041 | assert(events); |
| 1042 | assert(flattened_events); |
| 1043 | |
| 1044 | lttng_dynamic_buffer_init(&local_flattened_events); |
| 1045 | nb_events = lttng_dynamic_pointer_array_get_count(events); |
| 1046 | |
| 1047 | ret_code = compute_flattened_size(events, &storage_req); |
| 1048 | if (ret_code != LTTNG_OK) { |
| 1049 | goto end; |
| 1050 | } |
| 1051 | |
| 1052 | /* |
| 1053 | * We must ensure that "local_flattened_events" is never resized so as |
| 1054 | * to preserve the validity of the flattened objects. |
| 1055 | */ |
| 1056 | ret = lttng_dynamic_buffer_set_capacity( |
| 1057 | &local_flattened_events, storage_req); |
| 1058 | if (ret) { |
| 1059 | ret_code = LTTNG_ERR_NOMEM; |
| 1060 | goto end; |
| 1061 | } |
| 1062 | |
| 1063 | /* Start by laying the struct lttng_event */ |
| 1064 | for (i = 0; i < nb_events; i++) { |
| 1065 | struct event_list_element *element = |
| 1066 | lttng_dynamic_pointer_array_get_pointer( |
| 1067 | events, i); |
| 1068 | |
| 1069 | if (!element) { |
| 1070 | ret_code = LTTNG_ERR_FATAL; |
| 1071 | goto end; |
| 1072 | } |
| 1073 | ret = lttng_dynamic_buffer_append(&local_flattened_events, |
| 1074 | element->event, sizeof(struct lttng_event)); |
| 1075 | if (ret) { |
| 1076 | ret_code = LTTNG_ERR_NOMEM; |
| 1077 | goto end; |
| 1078 | } |
| 1079 | } |
| 1080 | |
| 1081 | for (i = 0; i < nb_events; i++) { |
| 1082 | struct event_list_element *element = lttng_dynamic_pointer_array_get_pointer(events, i); |
| 1083 | struct lttng_event *event = (struct lttng_event *) |
| 1084 | (local_flattened_events.data + (sizeof(struct lttng_event) * i)); |
| 1085 | struct lttng_event_extended *event_extended = |
| 1086 | (struct lttng_event_extended *) |
| 1087 | (local_flattened_events.data + local_flattened_events.size); |
| 1088 | const struct lttng_userspace_probe_location *location = NULL; |
| 1089 | |
| 1090 | assert(element); |
| 1091 | |
| 1092 | /* Insert struct lttng_event_extended. */ |
| 1093 | ret = lttng_dynamic_buffer_set_size(&local_flattened_events, |
| 1094 | local_flattened_events.size + |
| 1095 | sizeof(*event_extended)); |
| 1096 | if (ret) { |
| 1097 | ret_code = LTTNG_ERR_NOMEM; |
| 1098 | goto end; |
| 1099 | } |
| 1100 | event->extended.ptr = event_extended; |
| 1101 | |
| 1102 | /* Insert filter expression. */ |
| 1103 | if (element->filter_expression) { |
| 1104 | size_t len = strlen(element->filter_expression) + 1; |
| 1105 | |
| 1106 | event_extended->filter_expression = |
| 1107 | local_flattened_events.data + |
| 1108 | local_flattened_events.size; |
| 1109 | ret = lttng_dynamic_buffer_append( |
| 1110 | &local_flattened_events, |
| 1111 | element->filter_expression, len); |
| 1112 | if (ret) { |
| 1113 | ret_code = LTTNG_ERR_NOMEM; |
| 1114 | goto end; |
| 1115 | } |
| 1116 | } |
| 1117 | |
| 1118 | /* Insert exclusions. */ |
| 1119 | if (element->exclusions) { |
| 1120 | event_extended->exclusions.count = |
| 1121 | element->exclusions->count; |
| 1122 | event_extended->exclusions.strings = |
| 1123 | local_flattened_events.data + |
| 1124 | local_flattened_events.size; |
| 1125 | |
| 1126 | ret = lttng_dynamic_buffer_append( |
| 1127 | &local_flattened_events, |
| 1128 | element->exclusions->names, |
| 1129 | element->exclusions->count * |
| 1130 | LTTNG_SYMBOL_NAME_LEN); |
| 1131 | if (ret) { |
| 1132 | ret_code = LTTNG_ERR_NOMEM; |
| 1133 | goto end; |
| 1134 | } |
| 1135 | } |
| 1136 | |
| 1137 | /* Insert padding to align to 64-bits. */ |
| 1138 | ret = lttng_dynamic_buffer_set_size(&local_flattened_events, |
| 1139 | ALIGN_TO(local_flattened_events.size, |
| 1140 | sizeof(uint64_t))); |
| 1141 | if (ret) { |
| 1142 | ret_code = LTTNG_ERR_NOMEM; |
| 1143 | goto end; |
| 1144 | } |
| 1145 | |
| 1146 | location = lttng_event_get_userspace_probe_location( |
| 1147 | element->event); |
| 1148 | if (location) { |
| 1149 | event_extended->probe_location = (struct lttng_userspace_probe_location *) |
| 1150 | (local_flattened_events.data + local_flattened_events.size); |
| 1151 | ret = lttng_userspace_probe_location_flatten( |
| 1152 | location, &local_flattened_events); |
| 1153 | if (ret < 0) { |
| 1154 | ret_code = LTTNG_ERR_PROBE_LOCATION_INVAL; |
| 1155 | goto end; |
| 1156 | } |
| 1157 | } |
| 1158 | } |
| 1159 | |
| 1160 | /* Don't reset local_flattened_events buffer as we return its content. */ |
| 1161 | *flattened_events = (struct lttng_event *) local_flattened_events.data; |
| 1162 | lttng_dynamic_buffer_init(&local_flattened_events); |
| 1163 | ret_code = LTTNG_OK; |
| 1164 | end: |
| 1165 | lttng_dynamic_buffer_reset(&local_flattened_events); |
| 1166 | return ret_code; |
| 1167 | } |
| 1168 | |
| 1169 | static enum lttng_error_code event_list_create_from_buffer( |
| 1170 | const struct lttng_buffer_view *view, |
| 1171 | unsigned int count, |
| 1172 | struct lttng_dynamic_pointer_array *event_list) |
| 1173 | { |
| 1174 | enum lttng_error_code ret_code; |
| 1175 | int ret; |
| 1176 | unsigned int i; |
| 1177 | int offset = 0; |
| 1178 | |
| 1179 | assert(view); |
| 1180 | assert(event_list); |
| 1181 | |
| 1182 | for (i = 0; i < count; i++) { |
| 1183 | ssize_t event_size; |
| 1184 | const struct lttng_buffer_view event_view = |
| 1185 | lttng_buffer_view_from_view(view, offset, -1); |
| 1186 | struct event_list_element *element = zmalloc(sizeof(*element)); |
| 1187 | |
| 1188 | if (!element) { |
| 1189 | ret_code = LTTNG_ERR_NOMEM; |
| 1190 | goto end; |
| 1191 | } |
| 1192 | |
| 1193 | /* |
| 1194 | * Lifetime and management of the object is now bound to the |
| 1195 | * array. |
| 1196 | */ |
| 1197 | ret = lttng_dynamic_pointer_array_add_pointer( |
| 1198 | event_list, element); |
| 1199 | if (ret) { |
| 1200 | event_list_destructor(element); |
| 1201 | ret_code = LTTNG_ERR_NOMEM; |
| 1202 | goto end; |
| 1203 | } |
| 1204 | |
| 1205 | /* |
| 1206 | * Bytecode is not transmitted on listing in any case we do not |
| 1207 | * care about it. |
| 1208 | */ |
| 1209 | event_size = lttng_event_create_from_buffer(&event_view, |
| 1210 | &element->event, |
| 1211 | &element->exclusions, |
| 1212 | &element->filter_expression, NULL, -1); |
| 1213 | if (event_size < 0) { |
| 1214 | ret_code = LTTNG_ERR_INVALID; |
| 1215 | goto end; |
| 1216 | } |
| 1217 | |
| 1218 | offset += event_size; |
| 1219 | } |
| 1220 | |
| 1221 | if (view->size != offset) { |
| 1222 | ret_code = LTTNG_ERR_INVALID; |
| 1223 | goto end; |
| 1224 | } |
| 1225 | |
| 1226 | ret_code = LTTNG_OK; |
| 1227 | |
| 1228 | end: |
| 1229 | return ret_code; |
| 1230 | } |
| 1231 | |
| 1232 | LTTNG_HIDDEN |
| 1233 | enum lttng_error_code lttng_events_create_and_flatten_from_buffer( |
| 1234 | const struct lttng_buffer_view *view, |
| 1235 | unsigned int count, |
| 1236 | struct lttng_event **events) |
| 1237 | { |
| 1238 | enum lttng_error_code ret = LTTNG_OK; |
| 1239 | struct lttng_dynamic_pointer_array local_events; |
| 1240 | |
| 1241 | lttng_dynamic_pointer_array_init(&local_events, event_list_destructor); |
| 1242 | |
| 1243 | /* Deserialize the events */ |
| 1244 | { |
| 1245 | const struct lttng_buffer_view events_view = |
| 1246 | lttng_buffer_view_from_view(view, 0, -1); |
| 1247 | |
| 1248 | ret = event_list_create_from_buffer( |
| 1249 | &events_view, count, &local_events); |
| 1250 | if (ret != LTTNG_OK) { |
| 1251 | goto end; |
| 1252 | } |
| 1253 | } |
| 1254 | |
| 1255 | ret = flatten_lttng_events(&local_events, events); |
| 1256 | if (ret != LTTNG_OK) { |
| 1257 | goto end; |
| 1258 | } |
| 1259 | |
| 1260 | end: |
| 1261 | lttng_dynamic_pointer_array_reset(&local_events); |
| 1262 | return ret; |
| 1263 | } |