| 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 <common/align.h> |
| 18 | #include <lttng/constant.h> |
| 19 | #include <lttng/event-internal.h> |
| 20 | #include <lttng/event.h> |
| 21 | #include <lttng/userspace-probe-internal.h> |
| 22 | #include <stdint.h> |
| 23 | #include <string.h> |
| 24 | |
| 25 | struct event_list_element { |
| 26 | struct lttng_event *event; |
| 27 | struct lttng_event_exclusion *exclusions; |
| 28 | char *filter_expression; |
| 29 | }; |
| 30 | |
| 31 | static void event_list_destructor(void *ptr) |
| 32 | { |
| 33 | struct event_list_element *element = (struct event_list_element *) ptr; |
| 34 | |
| 35 | free(element->filter_expression); |
| 36 | free(element->exclusions); |
| 37 | lttng_event_destroy(element->event); |
| 38 | free(element); |
| 39 | } |
| 40 | |
| 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 = (lttng_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 = (lttng_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_payload *payload) |
| 77 | { |
| 78 | int ret; |
| 79 | size_t symbol_name_len; |
| 80 | struct lttng_event_probe_attr_comm comm = {}; |
| 81 | |
| 82 | symbol_name_len = lttng_strnlen( |
| 83 | probe->symbol_name, sizeof(probe->symbol_name)); |
| 84 | if (symbol_name_len == sizeof(probe->symbol_name)) { |
| 85 | /* Not null-termintated. */ |
| 86 | ret = -1; |
| 87 | goto end; |
| 88 | } |
| 89 | |
| 90 | /* Include the null terminator. */ |
| 91 | symbol_name_len += 1; |
| 92 | |
| 93 | comm.symbol_name_len = (uint32_t) symbol_name_len; |
| 94 | comm.addr = probe->addr; |
| 95 | comm.offset = probe->addr; |
| 96 | |
| 97 | ret = lttng_dynamic_buffer_append( |
| 98 | &payload->buffer, &comm, sizeof(comm)); |
| 99 | if (ret < 0) { |
| 100 | ret = -1; |
| 101 | goto end; |
| 102 | } |
| 103 | |
| 104 | ret = lttng_dynamic_buffer_append( |
| 105 | &payload->buffer, probe->symbol_name, symbol_name_len); |
| 106 | end: |
| 107 | return ret; |
| 108 | } |
| 109 | |
| 110 | static int lttng_event_function_attr_serialize( |
| 111 | const struct lttng_event_function_attr *function, |
| 112 | struct lttng_payload *payload) |
| 113 | { |
| 114 | int ret; |
| 115 | size_t symbol_name_len; |
| 116 | struct lttng_event_function_attr_comm comm = { 0 }; |
| 117 | |
| 118 | symbol_name_len = lttng_strnlen( |
| 119 | function->symbol_name, sizeof(function->symbol_name)); |
| 120 | if (symbol_name_len == sizeof(function->symbol_name)) { |
| 121 | /* Not null-termintated. */ |
| 122 | ret = -1; |
| 123 | goto end; |
| 124 | } |
| 125 | |
| 126 | /* Include the null terminator. */ |
| 127 | symbol_name_len += 1; |
| 128 | |
| 129 | comm.symbol_name_len = (uint32_t) symbol_name_len; |
| 130 | |
| 131 | ret = lttng_dynamic_buffer_append( |
| 132 | &payload->buffer, &comm, sizeof(comm)); |
| 133 | if (ret < 0) { |
| 134 | ret = -1; |
| 135 | goto end; |
| 136 | } |
| 137 | |
| 138 | ret = lttng_dynamic_buffer_append(&payload->buffer, |
| 139 | function->symbol_name, symbol_name_len); |
| 140 | end: |
| 141 | return ret; |
| 142 | } |
| 143 | |
| 144 | static ssize_t lttng_event_probe_attr_create_from_payload( |
| 145 | struct lttng_payload_view *view, |
| 146 | struct lttng_event_probe_attr **probe_attr) |
| 147 | { |
| 148 | ssize_t ret, offset = 0; |
| 149 | const struct lttng_event_probe_attr_comm *comm; |
| 150 | struct lttng_event_probe_attr *local_attr = NULL; |
| 151 | struct lttng_payload_view comm_view = lttng_payload_view_from_view( |
| 152 | view, offset, sizeof(*comm)); |
| 153 | |
| 154 | if (!lttng_payload_view_is_valid(&comm_view)) { |
| 155 | ret = -1; |
| 156 | goto end; |
| 157 | } |
| 158 | |
| 159 | comm = (typeof(comm)) comm_view.buffer.data; |
| 160 | offset += sizeof(*comm); |
| 161 | |
| 162 | local_attr = (struct lttng_event_probe_attr *) zmalloc( |
| 163 | sizeof(*local_attr)); |
| 164 | if (local_attr == NULL) { |
| 165 | ret = -1; |
| 166 | goto end; |
| 167 | } |
| 168 | |
| 169 | local_attr->addr = comm->addr; |
| 170 | local_attr->offset = comm->offset; |
| 171 | |
| 172 | { |
| 173 | const char *name; |
| 174 | struct lttng_payload_view name_view = |
| 175 | lttng_payload_view_from_view(view, offset, |
| 176 | comm->symbol_name_len); |
| 177 | |
| 178 | if (!lttng_payload_view_is_valid(&name_view)) { |
| 179 | ret = -1; |
| 180 | goto end; |
| 181 | } |
| 182 | |
| 183 | name = name_view.buffer.data; |
| 184 | |
| 185 | if (!lttng_buffer_view_contains_string(&name_view.buffer, name, |
| 186 | comm->symbol_name_len)) { |
| 187 | ret = -1; |
| 188 | goto end; |
| 189 | } |
| 190 | |
| 191 | ret = lttng_strncpy(local_attr->symbol_name, name, |
| 192 | sizeof(local_attr->symbol_name)); |
| 193 | if (ret) { |
| 194 | ret = -1; |
| 195 | goto end; |
| 196 | } |
| 197 | |
| 198 | offset += comm->symbol_name_len; |
| 199 | } |
| 200 | |
| 201 | *probe_attr = local_attr; |
| 202 | local_attr = NULL; |
| 203 | ret = offset; |
| 204 | end: |
| 205 | free(local_attr); |
| 206 | return ret; |
| 207 | } |
| 208 | |
| 209 | static ssize_t lttng_event_function_attr_create_from_payload( |
| 210 | struct lttng_payload_view *view, |
| 211 | struct lttng_event_function_attr **function_attr) |
| 212 | { |
| 213 | ssize_t ret, offset = 0; |
| 214 | const struct lttng_event_function_attr_comm *comm; |
| 215 | struct lttng_event_function_attr *local_attr = NULL; |
| 216 | struct lttng_payload_view comm_view = lttng_payload_view_from_view( |
| 217 | view, offset, sizeof(*comm)); |
| 218 | |
| 219 | if (!lttng_payload_view_is_valid(&comm_view)) { |
| 220 | ret = -1; |
| 221 | goto end; |
| 222 | } |
| 223 | |
| 224 | comm = (typeof(comm)) view->buffer.data; |
| 225 | offset += sizeof(*comm); |
| 226 | |
| 227 | local_attr = (struct lttng_event_function_attr *) zmalloc( |
| 228 | sizeof(*local_attr)); |
| 229 | if (local_attr == NULL) { |
| 230 | ret = -1; |
| 231 | goto end; |
| 232 | } |
| 233 | |
| 234 | { |
| 235 | const char *name; |
| 236 | struct lttng_payload_view name_view = |
| 237 | lttng_payload_view_from_view(view, offset, |
| 238 | comm->symbol_name_len); |
| 239 | |
| 240 | if (!lttng_payload_view_is_valid(&name_view)) { |
| 241 | ret = -1; |
| 242 | goto end; |
| 243 | } |
| 244 | |
| 245 | name = name_view.buffer.data; |
| 246 | |
| 247 | if (!lttng_buffer_view_contains_string(&name_view.buffer, name, |
| 248 | comm->symbol_name_len)) { |
| 249 | ret = -1; |
| 250 | goto end; |
| 251 | } |
| 252 | |
| 253 | ret = lttng_strncpy(local_attr->symbol_name, name, |
| 254 | sizeof(local_attr->symbol_name)); |
| 255 | if (ret) { |
| 256 | ret = -1; |
| 257 | goto end; |
| 258 | } |
| 259 | |
| 260 | offset += comm->symbol_name_len; |
| 261 | } |
| 262 | |
| 263 | *function_attr = local_attr; |
| 264 | local_attr = NULL; |
| 265 | ret = offset; |
| 266 | end: |
| 267 | free(local_attr); |
| 268 | return ret; |
| 269 | } |
| 270 | |
| 271 | static ssize_t lttng_event_exclusions_create_from_payload( |
| 272 | struct lttng_payload_view *view, |
| 273 | uint32_t count, |
| 274 | struct lttng_event_exclusion **exclusions) |
| 275 | { |
| 276 | ssize_t ret, offset = 0; |
| 277 | size_t size = (count * LTTNG_SYMBOL_NAME_LEN); |
| 278 | uint32_t i; |
| 279 | const struct lttng_event_exclusion_comm *comm; |
| 280 | struct lttng_event_exclusion *local_exclusions; |
| 281 | |
| 282 | local_exclusions = (struct lttng_event_exclusion *) zmalloc( |
| 283 | sizeof(struct lttng_event_exclusion) + size); |
| 284 | if (!local_exclusions) { |
| 285 | ret = -1; |
| 286 | goto end; |
| 287 | } |
| 288 | |
| 289 | local_exclusions->count = count; |
| 290 | |
| 291 | for (i = 0; i < count; i++) { |
| 292 | const char *string; |
| 293 | struct lttng_buffer_view string_view; |
| 294 | const struct lttng_buffer_view comm_view = |
| 295 | lttng_buffer_view_from_view(&view->buffer, |
| 296 | offset, sizeof(*comm)); |
| 297 | |
| 298 | if (!lttng_buffer_view_is_valid(&comm_view)) { |
| 299 | ret = -1; |
| 300 | goto end; |
| 301 | } |
| 302 | |
| 303 | comm = (typeof(comm)) comm_view.data; |
| 304 | offset += sizeof(*comm); |
| 305 | |
| 306 | string_view = lttng_buffer_view_from_view( |
| 307 | &view->buffer, offset, comm->len); |
| 308 | |
| 309 | if (!lttng_buffer_view_is_valid(&string_view)) { |
| 310 | ret = -1; |
| 311 | goto end; |
| 312 | } |
| 313 | |
| 314 | string = string_view.data; |
| 315 | |
| 316 | if (!lttng_buffer_view_contains_string( |
| 317 | &string_view, string, comm->len)) { |
| 318 | ret = -1; |
| 319 | goto end; |
| 320 | } |
| 321 | |
| 322 | ret = lttng_strncpy(LTTNG_EVENT_EXCLUSION_NAME_AT(local_exclusions, i), string, |
| 323 | sizeof(LTTNG_EVENT_EXCLUSION_NAME_AT(local_exclusions, i))); |
| 324 | if (ret) { |
| 325 | ret = -1; |
| 326 | goto end; |
| 327 | } |
| 328 | |
| 329 | offset += comm->len; |
| 330 | } |
| 331 | |
| 332 | *exclusions = local_exclusions; |
| 333 | local_exclusions = NULL; |
| 334 | ret = offset; |
| 335 | end: |
| 336 | free(local_exclusions); |
| 337 | return ret; |
| 338 | } |
| 339 | |
| 340 | ssize_t lttng_event_create_from_payload(struct lttng_payload_view *view, |
| 341 | struct lttng_event **out_event, |
| 342 | struct lttng_event_exclusion **out_exclusion, |
| 343 | char **out_filter_expression, |
| 344 | struct lttng_bytecode **out_bytecode) |
| 345 | { |
| 346 | ssize_t ret, offset = 0; |
| 347 | struct lttng_event *local_event = NULL; |
| 348 | struct lttng_event_exclusion *local_exclusions = NULL; |
| 349 | struct lttng_bytecode *local_bytecode = NULL; |
| 350 | char *local_filter_expression = NULL; |
| 351 | const struct lttng_event_comm *event_comm; |
| 352 | struct lttng_event_function_attr *local_function_attr = NULL; |
| 353 | struct lttng_event_probe_attr *local_probe_attr = NULL; |
| 354 | struct lttng_userspace_probe_location *local_userspace_probe_location = |
| 355 | NULL; |
| 356 | |
| 357 | /* |
| 358 | * Only event is obligatory, the other output argument are optional and |
| 359 | * depends on what the caller is interested in. |
| 360 | */ |
| 361 | assert(out_event); |
| 362 | assert(view); |
| 363 | |
| 364 | { |
| 365 | struct lttng_payload_view comm_view = |
| 366 | lttng_payload_view_from_view(view, offset, |
| 367 | sizeof(*event_comm)); |
| 368 | |
| 369 | if (!lttng_payload_view_is_valid(&comm_view)) { |
| 370 | ret = -1; |
| 371 | goto end; |
| 372 | } |
| 373 | |
| 374 | /* lttng_event_comm header */ |
| 375 | event_comm = (typeof(event_comm)) comm_view.buffer.data; |
| 376 | offset += sizeof(*event_comm); |
| 377 | } |
| 378 | |
| 379 | local_event = lttng_event_create(); |
| 380 | if (local_event == NULL) { |
| 381 | ret = -1; |
| 382 | goto end; |
| 383 | } |
| 384 | |
| 385 | local_event->type = (enum lttng_event_type) event_comm->event_type; |
| 386 | local_event->loglevel_type = (enum lttng_loglevel_type) event_comm->loglevel_type; |
| 387 | local_event->loglevel = event_comm->loglevel; |
| 388 | local_event->enabled = event_comm->enabled; |
| 389 | local_event->pid = event_comm->pid; |
| 390 | local_event->flags = (enum lttng_event_flag) event_comm->flags; |
| 391 | |
| 392 | { |
| 393 | const char *name; |
| 394 | const struct lttng_buffer_view name_view = |
| 395 | lttng_buffer_view_from_view(&view->buffer, |
| 396 | offset, event_comm->name_len); |
| 397 | |
| 398 | if (!lttng_buffer_view_is_valid(&name_view)) { |
| 399 | ret = -1; |
| 400 | goto end; |
| 401 | } |
| 402 | |
| 403 | name = (const char *) name_view.data; |
| 404 | |
| 405 | if (!lttng_buffer_view_contains_string( |
| 406 | &name_view, name, event_comm->name_len)) { |
| 407 | ret = -1; |
| 408 | goto end; |
| 409 | } |
| 410 | |
| 411 | ret = lttng_strncpy(local_event->name, name, |
| 412 | sizeof(local_event->name)); |
| 413 | if (ret) { |
| 414 | ret = -1; |
| 415 | goto end; |
| 416 | } |
| 417 | |
| 418 | offset += event_comm->name_len; |
| 419 | } |
| 420 | |
| 421 | /* Exclusions */ |
| 422 | if (event_comm->exclusion_count == 0) { |
| 423 | goto deserialize_filter_expression; |
| 424 | } |
| 425 | |
| 426 | { |
| 427 | struct lttng_payload_view exclusions_view = |
| 428 | lttng_payload_view_from_view( |
| 429 | view, offset, -1); |
| 430 | |
| 431 | if (!lttng_payload_view_is_valid(&exclusions_view)) { |
| 432 | ret = -1; |
| 433 | goto end; |
| 434 | } |
| 435 | |
| 436 | ret = lttng_event_exclusions_create_from_payload(&exclusions_view, |
| 437 | event_comm->exclusion_count, &local_exclusions); |
| 438 | if (ret < 0) { |
| 439 | ret = -1; |
| 440 | goto end; |
| 441 | } |
| 442 | offset += ret; |
| 443 | |
| 444 | local_event->exclusion = 1; |
| 445 | } |
| 446 | |
| 447 | deserialize_filter_expression: |
| 448 | |
| 449 | if (event_comm->filter_expression_len == 0) { |
| 450 | if (event_comm->bytecode_len != 0) { |
| 451 | /* |
| 452 | * This is an invalid event payload. |
| 453 | * |
| 454 | * Filter expression without bytecode is possible but |
| 455 | * not the other way around. |
| 456 | * */ |
| 457 | ret = -1; |
| 458 | goto end; |
| 459 | } |
| 460 | goto deserialize_event_type_payload; |
| 461 | } |
| 462 | |
| 463 | { |
| 464 | const char *filter_expression_buffer; |
| 465 | struct lttng_buffer_view filter_expression_view = |
| 466 | lttng_buffer_view_from_view(&view->buffer, offset, |
| 467 | event_comm->filter_expression_len); |
| 468 | |
| 469 | if (!lttng_buffer_view_is_valid(&filter_expression_view)) { |
| 470 | ret = -1; |
| 471 | goto end; |
| 472 | } |
| 473 | |
| 474 | filter_expression_buffer = filter_expression_view.data; |
| 475 | |
| 476 | if (!lttng_buffer_view_contains_string(&filter_expression_view, |
| 477 | filter_expression_buffer, |
| 478 | event_comm->filter_expression_len)) { |
| 479 | ret = -1; |
| 480 | goto end; |
| 481 | } |
| 482 | |
| 483 | local_filter_expression = lttng_strndup( |
| 484 | filter_expression_buffer, |
| 485 | event_comm->filter_expression_len); |
| 486 | if (!local_filter_expression) { |
| 487 | ret = -1; |
| 488 | goto end; |
| 489 | } |
| 490 | |
| 491 | local_event->filter = 1; |
| 492 | |
| 493 | offset += event_comm->filter_expression_len; |
| 494 | } |
| 495 | |
| 496 | if (event_comm->bytecode_len == 0) { |
| 497 | /* |
| 498 | * Filter expression can be present but without bytecode |
| 499 | * when dealing with event listing. |
| 500 | */ |
| 501 | goto deserialize_event_type_payload; |
| 502 | } |
| 503 | |
| 504 | /* Bytecode */ |
| 505 | { |
| 506 | struct lttng_payload_view bytecode_view = |
| 507 | lttng_payload_view_from_view(view, offset, |
| 508 | event_comm->bytecode_len); |
| 509 | |
| 510 | if (!lttng_payload_view_is_valid(&bytecode_view)) { |
| 511 | ret = -1; |
| 512 | goto end; |
| 513 | } |
| 514 | |
| 515 | local_bytecode = (struct lttng_bytecode *) zmalloc( |
| 516 | event_comm->bytecode_len); |
| 517 | if (!local_bytecode) { |
| 518 | ret = -1; |
| 519 | goto end; |
| 520 | } |
| 521 | |
| 522 | memcpy(local_bytecode, bytecode_view.buffer.data, |
| 523 | event_comm->bytecode_len); |
| 524 | if ((local_bytecode->len + sizeof(*local_bytecode)) != |
| 525 | event_comm->bytecode_len) { |
| 526 | ret = -1; |
| 527 | goto end; |
| 528 | } |
| 529 | |
| 530 | offset += event_comm->bytecode_len; |
| 531 | } |
| 532 | |
| 533 | deserialize_event_type_payload: |
| 534 | /* Event type specific payload */ |
| 535 | switch (local_event->type) { |
| 536 | case LTTNG_EVENT_FUNCTION: |
| 537 | /* Fallthrough */ |
| 538 | case LTTNG_EVENT_PROBE: |
| 539 | { |
| 540 | struct lttng_payload_view probe_attr_view = |
| 541 | lttng_payload_view_from_view(view, offset, |
| 542 | event_comm->lttng_event_probe_attr_len); |
| 543 | |
| 544 | if (event_comm->lttng_event_probe_attr_len == 0) { |
| 545 | ret = -1; |
| 546 | goto end; |
| 547 | } |
| 548 | |
| 549 | if (!lttng_payload_view_is_valid(&probe_attr_view)) { |
| 550 | ret = -1; |
| 551 | goto end; |
| 552 | } |
| 553 | |
| 554 | ret = lttng_event_probe_attr_create_from_payload( |
| 555 | &probe_attr_view, &local_probe_attr); |
| 556 | if (ret < 0 || ret != event_comm->lttng_event_probe_attr_len) { |
| 557 | ret = -1; |
| 558 | goto end; |
| 559 | } |
| 560 | |
| 561 | /* Copy to the local event. */ |
| 562 | memcpy(&local_event->attr.probe, local_probe_attr, |
| 563 | sizeof(local_event->attr.probe)); |
| 564 | |
| 565 | offset += ret; |
| 566 | break; |
| 567 | } |
| 568 | case LTTNG_EVENT_FUNCTION_ENTRY: |
| 569 | { |
| 570 | struct lttng_payload_view function_attr_view = |
| 571 | lttng_payload_view_from_view(view, offset, |
| 572 | event_comm->lttng_event_function_attr_len); |
| 573 | |
| 574 | if (event_comm->lttng_event_function_attr_len == 0) { |
| 575 | ret = -1; |
| 576 | goto end; |
| 577 | } |
| 578 | |
| 579 | if (!lttng_payload_view_is_valid(&function_attr_view)) { |
| 580 | ret = -1; |
| 581 | goto end; |
| 582 | } |
| 583 | |
| 584 | ret = lttng_event_function_attr_create_from_payload( |
| 585 | &function_attr_view, &local_function_attr); |
| 586 | if (ret < 0 || ret != event_comm->lttng_event_function_attr_len) { |
| 587 | ret = -1; |
| 588 | goto end; |
| 589 | } |
| 590 | |
| 591 | /* Copy to the local event. */ |
| 592 | memcpy(&local_event->attr.ftrace, local_function_attr, |
| 593 | sizeof(local_event->attr.ftrace)); |
| 594 | |
| 595 | offset += ret; |
| 596 | |
| 597 | break; |
| 598 | } |
| 599 | case LTTNG_EVENT_USERSPACE_PROBE: |
| 600 | { |
| 601 | struct lttng_payload_view userspace_probe_location_view = |
| 602 | lttng_payload_view_from_view(view, offset, |
| 603 | event_comm->userspace_probe_location_len); |
| 604 | |
| 605 | if (event_comm->userspace_probe_location_len == 0) { |
| 606 | ret = -1; |
| 607 | goto end; |
| 608 | } |
| 609 | |
| 610 | if (!lttng_payload_view_is_valid( |
| 611 | &userspace_probe_location_view)) { |
| 612 | ret = -1; |
| 613 | goto end; |
| 614 | } |
| 615 | |
| 616 | ret = lttng_userspace_probe_location_create_from_payload( |
| 617 | &userspace_probe_location_view, |
| 618 | &local_userspace_probe_location); |
| 619 | if (ret < 0) { |
| 620 | WARN("Failed to create a userspace probe location from the received buffer"); |
| 621 | ret = -1; |
| 622 | goto end; |
| 623 | } |
| 624 | |
| 625 | if (ret != event_comm->userspace_probe_location_len) { |
| 626 | WARN("Userspace probe location from the received buffer is not the advertised length: header length = %" PRIu32 ", payload length = %zd", event_comm->userspace_probe_location_len, ret); |
| 627 | ret = -1; |
| 628 | goto end; |
| 629 | } |
| 630 | |
| 631 | /* Attach the probe location to the event. */ |
| 632 | ret = lttng_event_set_userspace_probe_location( |
| 633 | local_event, local_userspace_probe_location); |
| 634 | if (ret) { |
| 635 | ret = LTTNG_ERR_PROBE_LOCATION_INVAL; |
| 636 | goto end; |
| 637 | } |
| 638 | |
| 639 | /* |
| 640 | * Userspace probe location object ownership transfered to the |
| 641 | * event object. |
| 642 | */ |
| 643 | local_userspace_probe_location = NULL; |
| 644 | offset += event_comm->userspace_probe_location_len; |
| 645 | break; |
| 646 | } |
| 647 | case LTTNG_EVENT_TRACEPOINT: |
| 648 | /* Fallthrough */ |
| 649 | case LTTNG_EVENT_ALL: |
| 650 | /* Fallthrough */ |
| 651 | case LTTNG_EVENT_SYSCALL: |
| 652 | /* Fallthrough */ |
| 653 | case LTTNG_EVENT_NOOP: |
| 654 | /* Nothing to do here */ |
| 655 | break; |
| 656 | default: |
| 657 | ret = LTTNG_ERR_UND; |
| 658 | goto end; |
| 659 | break; |
| 660 | } |
| 661 | |
| 662 | /* Transfer ownership to the caller. */ |
| 663 | *out_event = local_event; |
| 664 | local_event = NULL; |
| 665 | |
| 666 | if (out_bytecode) { |
| 667 | *out_bytecode = local_bytecode; |
| 668 | local_bytecode = NULL; |
| 669 | } |
| 670 | |
| 671 | if (out_exclusion) { |
| 672 | *out_exclusion = local_exclusions; |
| 673 | local_exclusions = NULL; |
| 674 | } |
| 675 | |
| 676 | if (out_filter_expression) { |
| 677 | *out_filter_expression = local_filter_expression; |
| 678 | local_filter_expression = NULL; |
| 679 | } |
| 680 | |
| 681 | ret = offset; |
| 682 | end: |
| 683 | lttng_event_destroy(local_event); |
| 684 | lttng_userspace_probe_location_destroy(local_userspace_probe_location); |
| 685 | free(local_filter_expression); |
| 686 | free(local_exclusions); |
| 687 | free(local_bytecode); |
| 688 | free(local_function_attr); |
| 689 | free(local_probe_attr); |
| 690 | return ret; |
| 691 | } |
| 692 | |
| 693 | int lttng_event_serialize(const struct lttng_event *event, |
| 694 | unsigned int exclusion_count, |
| 695 | char **exclusion_list, |
| 696 | char *filter_expression, |
| 697 | size_t bytecode_len, |
| 698 | struct lttng_bytecode *bytecode, |
| 699 | struct lttng_payload *payload) |
| 700 | { |
| 701 | int ret; |
| 702 | unsigned int i; |
| 703 | size_t header_offset, size_before_payload; |
| 704 | size_t name_len; |
| 705 | struct lttng_event_comm event_comm = {}; |
| 706 | struct lttng_event_comm *header; |
| 707 | |
| 708 | assert(event); |
| 709 | assert(payload); |
| 710 | assert(exclusion_count == 0 || exclusion_list); |
| 711 | |
| 712 | /* Save the header location for later in-place header update. */ |
| 713 | header_offset = payload->buffer.size; |
| 714 | |
| 715 | name_len = lttng_strnlen(event->name, sizeof(event->name)); |
| 716 | if (name_len == sizeof(event->name)) { |
| 717 | /* Event name is not NULL-terminated. */ |
| 718 | ret = -1; |
| 719 | goto end; |
| 720 | } |
| 721 | |
| 722 | /* Add null termination. */ |
| 723 | name_len += 1; |
| 724 | |
| 725 | if (exclusion_count > UINT32_MAX) { |
| 726 | /* Possible overflow. */ |
| 727 | ret = -1; |
| 728 | goto end; |
| 729 | } |
| 730 | |
| 731 | if (bytecode_len > UINT32_MAX) { |
| 732 | /* Possible overflow. */ |
| 733 | ret = -1; |
| 734 | goto end; |
| 735 | } |
| 736 | |
| 737 | event_comm.name_len = (uint32_t) name_len; |
| 738 | event_comm.event_type = (int8_t) event->type; |
| 739 | event_comm.loglevel_type = (int8_t) event->loglevel_type; |
| 740 | event_comm.loglevel = (int32_t) event->loglevel; |
| 741 | event_comm.enabled = (int8_t) event->enabled; |
| 742 | event_comm.pid = (int32_t) event->pid; |
| 743 | event_comm.exclusion_count = (uint32_t) exclusion_count; |
| 744 | event_comm.bytecode_len = (uint32_t) bytecode_len; |
| 745 | event_comm.flags = (int32_t) event->flags; |
| 746 | |
| 747 | if (filter_expression) { |
| 748 | event_comm.filter_expression_len = |
| 749 | strlen(filter_expression) + 1; |
| 750 | } |
| 751 | |
| 752 | /* Header */ |
| 753 | ret = lttng_dynamic_buffer_append( |
| 754 | &payload->buffer, &event_comm, sizeof(event_comm)); |
| 755 | if (ret) { |
| 756 | goto end; |
| 757 | } |
| 758 | |
| 759 | /* Event name */ |
| 760 | ret = lttng_dynamic_buffer_append( |
| 761 | &payload->buffer, event->name, name_len); |
| 762 | if (ret) { |
| 763 | goto end; |
| 764 | } |
| 765 | |
| 766 | /* Exclusions */ |
| 767 | for (i = 0; i < exclusion_count; i++) { |
| 768 | const size_t exclusion_len = lttng_strnlen( |
| 769 | *(exclusion_list + i), LTTNG_SYMBOL_NAME_LEN); |
| 770 | const struct lttng_event_exclusion_comm exclusion_header = { |
| 771 | .len = (uint32_t) exclusion_len + 1, |
| 772 | }; |
| 773 | |
| 774 | if (exclusion_len == LTTNG_SYMBOL_NAME_LEN) { |
| 775 | /* Exclusion is not NULL-terminated. */ |
| 776 | ret = -1; |
| 777 | goto end; |
| 778 | } |
| 779 | |
| 780 | ret = lttng_dynamic_buffer_append(&payload->buffer, |
| 781 | &exclusion_header, sizeof(exclusion_header)); |
| 782 | if (ret) { |
| 783 | goto end; |
| 784 | } |
| 785 | |
| 786 | ret = lttng_dynamic_buffer_append(&payload->buffer, |
| 787 | *(exclusion_list + i), exclusion_len + 1); |
| 788 | if (ret) { |
| 789 | goto end; |
| 790 | } |
| 791 | } |
| 792 | |
| 793 | /* Filter expression and its bytecode */ |
| 794 | if (filter_expression) { |
| 795 | ret = lttng_dynamic_buffer_append(&payload->buffer, |
| 796 | filter_expression, |
| 797 | event_comm.filter_expression_len); |
| 798 | if (ret) { |
| 799 | goto end; |
| 800 | } |
| 801 | |
| 802 | /* |
| 803 | * Bytecode can be absent when we serialize to the client |
| 804 | * for listing. |
| 805 | */ |
| 806 | if (bytecode) { |
| 807 | ret = lttng_dynamic_buffer_append(&payload->buffer, |
| 808 | bytecode, bytecode_len); |
| 809 | if (ret) { |
| 810 | goto end; |
| 811 | } |
| 812 | } |
| 813 | } |
| 814 | |
| 815 | size_before_payload = payload->buffer.size; |
| 816 | |
| 817 | /* Event type specific payload */ |
| 818 | switch (event->type) { |
| 819 | case LTTNG_EVENT_FUNCTION: |
| 820 | /* Fallthrough */ |
| 821 | case LTTNG_EVENT_PROBE: |
| 822 | ret = lttng_event_probe_attr_serialize(&event->attr.probe, payload); |
| 823 | if (ret) { |
| 824 | ret = -1; |
| 825 | goto end; |
| 826 | } |
| 827 | |
| 828 | header = (struct lttng_event_comm *) ((char *) payload->buffer.data + |
| 829 | header_offset); |
| 830 | header->lttng_event_probe_attr_len = |
| 831 | payload->buffer.size - size_before_payload; |
| 832 | |
| 833 | break; |
| 834 | case LTTNG_EVENT_FUNCTION_ENTRY: |
| 835 | ret = lttng_event_function_attr_serialize( |
| 836 | &event->attr.ftrace, payload); |
| 837 | if (ret) { |
| 838 | ret = -1; |
| 839 | goto end; |
| 840 | } |
| 841 | |
| 842 | /* Update the lttng_event_function_attr len. */ |
| 843 | header = (struct lttng_event_comm *) ((char *) payload->buffer.data + |
| 844 | header_offset); |
| 845 | header->lttng_event_function_attr_len = |
| 846 | payload->buffer.size - size_before_payload; |
| 847 | |
| 848 | break; |
| 849 | case LTTNG_EVENT_USERSPACE_PROBE: |
| 850 | { |
| 851 | const struct lttng_event_extended *ev_ext = |
| 852 | (const struct lttng_event_extended *) |
| 853 | event->extended.ptr; |
| 854 | |
| 855 | assert(event->extended.ptr); |
| 856 | assert(ev_ext->probe_location); |
| 857 | |
| 858 | size_before_payload = payload->buffer.size; |
| 859 | if (ev_ext->probe_location) { |
| 860 | /* |
| 861 | * lttng_userspace_probe_location_serialize returns the |
| 862 | * number of bytes that were appended to the buffer. |
| 863 | */ |
| 864 | ret = lttng_userspace_probe_location_serialize( |
| 865 | ev_ext->probe_location, payload); |
| 866 | if (ret < 0) { |
| 867 | goto end; |
| 868 | } |
| 869 | |
| 870 | ret = 0; |
| 871 | |
| 872 | /* Update the userspace probe location len. */ |
| 873 | header = (struct lttng_event_comm *) ((char *) payload->buffer.data + |
| 874 | header_offset); |
| 875 | header->userspace_probe_location_len = |
| 876 | payload->buffer.size - size_before_payload; |
| 877 | } |
| 878 | break; |
| 879 | } |
| 880 | case LTTNG_EVENT_TRACEPOINT: |
| 881 | /* Fallthrough */ |
| 882 | case LTTNG_EVENT_ALL: |
| 883 | /* Fallthrough */ |
| 884 | default: |
| 885 | /* Nothing to do here. */ |
| 886 | break; |
| 887 | } |
| 888 | |
| 889 | end: |
| 890 | return ret; |
| 891 | } |
| 892 | |
| 893 | static ssize_t lttng_event_context_app_populate_from_payload( |
| 894 | const struct lttng_payload_view *view, |
| 895 | struct lttng_event_context *event_ctx) |
| 896 | { |
| 897 | ssize_t ret, offset = 0; |
| 898 | const struct lttng_event_context_app_comm *comm; |
| 899 | char *provider_name = NULL, *context_name = NULL; |
| 900 | size_t provider_name_len, context_name_len; |
| 901 | const struct lttng_buffer_view comm_view = lttng_buffer_view_from_view( |
| 902 | &view->buffer, offset, sizeof(*comm)); |
| 903 | |
| 904 | assert(event_ctx->ctx == LTTNG_EVENT_CONTEXT_APP_CONTEXT); |
| 905 | |
| 906 | if (!lttng_buffer_view_is_valid(&comm_view)) { |
| 907 | ret = -1; |
| 908 | goto end; |
| 909 | } |
| 910 | |
| 911 | comm = (typeof(comm)) comm_view.data; |
| 912 | offset += sizeof(*comm); |
| 913 | |
| 914 | provider_name_len = comm->provider_name_len; |
| 915 | context_name_len = comm->ctx_name_len; |
| 916 | |
| 917 | if (provider_name_len == 0 || context_name_len == 0) { |
| 918 | /* |
| 919 | * Application provider and context names MUST |
| 920 | * be provided. |
| 921 | */ |
| 922 | ret = -1; |
| 923 | goto end; |
| 924 | } |
| 925 | |
| 926 | { |
| 927 | const char *name; |
| 928 | const struct lttng_buffer_view provider_name_view = |
| 929 | lttng_buffer_view_from_view(&view->buffer, |
| 930 | offset, |
| 931 | provider_name_len); |
| 932 | |
| 933 | if (!lttng_buffer_view_is_valid(&provider_name_view)) { |
| 934 | ret = -1; |
| 935 | goto end; |
| 936 | } |
| 937 | |
| 938 | name = provider_name_view.data; |
| 939 | |
| 940 | if (!lttng_buffer_view_contains_string(&provider_name_view, |
| 941 | name, provider_name_len)) { |
| 942 | ret = -1; |
| 943 | goto end; |
| 944 | } |
| 945 | |
| 946 | provider_name = lttng_strndup(name, provider_name_len); |
| 947 | if (!provider_name) { |
| 948 | ret = -1; |
| 949 | goto end; |
| 950 | } |
| 951 | |
| 952 | offset += provider_name_len; |
| 953 | } |
| 954 | |
| 955 | { |
| 956 | const char *name; |
| 957 | const struct lttng_buffer_view context_name_view = |
| 958 | lttng_buffer_view_from_view( |
| 959 | &view->buffer, offset, |
| 960 | context_name_len); |
| 961 | |
| 962 | if (!lttng_buffer_view_is_valid(&context_name_view)) { |
| 963 | ret = -1; |
| 964 | goto end; |
| 965 | } |
| 966 | |
| 967 | name = context_name_view.data; |
| 968 | |
| 969 | if (!lttng_buffer_view_contains_string(&context_name_view, name, |
| 970 | context_name_len)) { |
| 971 | ret = -1; |
| 972 | goto end; |
| 973 | } |
| 974 | |
| 975 | context_name = lttng_strndup(name, context_name_len); |
| 976 | if (!context_name) { |
| 977 | ret = -1; |
| 978 | goto end; |
| 979 | } |
| 980 | |
| 981 | offset += context_name_len; |
| 982 | } |
| 983 | |
| 984 | /* Transfer ownership of the strings */ |
| 985 | event_ctx->u.app_ctx.provider_name = provider_name; |
| 986 | event_ctx->u.app_ctx.ctx_name = context_name; |
| 987 | provider_name = NULL; |
| 988 | context_name = NULL; |
| 989 | |
| 990 | ret = offset; |
| 991 | end: |
| 992 | free(provider_name); |
| 993 | free(context_name); |
| 994 | |
| 995 | return ret; |
| 996 | } |
| 997 | |
| 998 | static ssize_t lttng_event_context_perf_counter_populate_from_payload( |
| 999 | const struct lttng_payload_view *view, |
| 1000 | struct lttng_event_context *event_ctx) |
| 1001 | { |
| 1002 | int ret; |
| 1003 | ssize_t consumed, offset = 0; |
| 1004 | const struct lttng_event_context_perf_counter_comm *comm; |
| 1005 | size_t name_len; |
| 1006 | const struct lttng_buffer_view comm_view = lttng_buffer_view_from_view( |
| 1007 | &view->buffer, offset, sizeof(*comm)); |
| 1008 | |
| 1009 | assert(event_ctx->ctx == LTTNG_EVENT_CONTEXT_PERF_COUNTER || |
| 1010 | event_ctx->ctx == |
| 1011 | LTTNG_EVENT_CONTEXT_PERF_THREAD_COUNTER || |
| 1012 | event_ctx->ctx == LTTNG_EVENT_CONTEXT_PERF_CPU_COUNTER); |
| 1013 | |
| 1014 | if (!lttng_buffer_view_is_valid(&comm_view)) { |
| 1015 | consumed = -1; |
| 1016 | goto end; |
| 1017 | } |
| 1018 | |
| 1019 | comm = (typeof(comm)) comm_view.data; |
| 1020 | offset += sizeof(*comm); |
| 1021 | |
| 1022 | name_len = comm->name_len; |
| 1023 | |
| 1024 | { |
| 1025 | const char *name; |
| 1026 | const struct lttng_buffer_view provider_name_view = |
| 1027 | lttng_buffer_view_from_view( |
| 1028 | &view->buffer, offset, |
| 1029 | name_len); |
| 1030 | |
| 1031 | if (!lttng_buffer_view_is_valid(&provider_name_view)) { |
| 1032 | consumed = -1; |
| 1033 | goto end; |
| 1034 | } |
| 1035 | |
| 1036 | name = provider_name_view.data; |
| 1037 | |
| 1038 | if (!lttng_buffer_view_contains_string( |
| 1039 | &provider_name_view, name, name_len)) { |
| 1040 | consumed = -1; |
| 1041 | goto end; |
| 1042 | } |
| 1043 | |
| 1044 | ret = lttng_strncpy(event_ctx->u.perf_counter.name, name, |
| 1045 | sizeof(event_ctx->u.perf_counter.name)); |
| 1046 | if (ret) { |
| 1047 | consumed = -1; |
| 1048 | goto end; |
| 1049 | } |
| 1050 | offset += name_len; |
| 1051 | } |
| 1052 | |
| 1053 | event_ctx->u.perf_counter.config = comm->config; |
| 1054 | event_ctx->u.perf_counter.type = comm->type; |
| 1055 | |
| 1056 | consumed = offset; |
| 1057 | |
| 1058 | end: |
| 1059 | return consumed; |
| 1060 | } |
| 1061 | |
| 1062 | ssize_t lttng_event_context_create_from_payload( |
| 1063 | struct lttng_payload_view *view, |
| 1064 | struct lttng_event_context **event_ctx) |
| 1065 | { |
| 1066 | ssize_t ret, offset = 0; |
| 1067 | const struct lttng_event_context_comm *comm; |
| 1068 | struct lttng_event_context *local_context = NULL; |
| 1069 | struct lttng_buffer_view comm_view = lttng_buffer_view_from_view( |
| 1070 | &view->buffer, offset, sizeof(*comm)); |
| 1071 | |
| 1072 | assert(event_ctx); |
| 1073 | assert(view); |
| 1074 | |
| 1075 | if (!lttng_buffer_view_is_valid(&comm_view)) { |
| 1076 | ret = -1; |
| 1077 | goto end; |
| 1078 | } |
| 1079 | |
| 1080 | comm = (typeof(comm)) comm_view.data; |
| 1081 | offset += sizeof(*comm); |
| 1082 | |
| 1083 | local_context = (struct lttng_event_context *) |
| 1084 | zmalloc(sizeof(*local_context)); |
| 1085 | if (!local_context) { |
| 1086 | ret = -1; |
| 1087 | goto end; |
| 1088 | } |
| 1089 | |
| 1090 | local_context->ctx = (lttng_event_context_type) comm->type; |
| 1091 | |
| 1092 | { |
| 1093 | struct lttng_payload_view subtype_view = |
| 1094 | lttng_payload_view_from_view(view, offset, -1); |
| 1095 | |
| 1096 | switch (local_context->ctx) { |
| 1097 | case LTTNG_EVENT_CONTEXT_APP_CONTEXT: |
| 1098 | ret = lttng_event_context_app_populate_from_payload( |
| 1099 | &subtype_view, local_context); |
| 1100 | break; |
| 1101 | case LTTNG_EVENT_CONTEXT_PERF_COUNTER: |
| 1102 | case LTTNG_EVENT_CONTEXT_PERF_THREAD_COUNTER: |
| 1103 | case LTTNG_EVENT_CONTEXT_PERF_CPU_COUNTER: |
| 1104 | ret = lttng_event_context_perf_counter_populate_from_payload( |
| 1105 | &subtype_view, local_context); |
| 1106 | break; |
| 1107 | default: |
| 1108 | /* Nothing else to deserialize. */ |
| 1109 | ret = 0; |
| 1110 | break; |
| 1111 | } |
| 1112 | } |
| 1113 | |
| 1114 | if (ret < 0) { |
| 1115 | goto end; |
| 1116 | } |
| 1117 | |
| 1118 | offset += ret; |
| 1119 | |
| 1120 | *event_ctx = local_context; |
| 1121 | local_context = NULL; |
| 1122 | ret = offset; |
| 1123 | |
| 1124 | end: |
| 1125 | free(local_context); |
| 1126 | return ret; |
| 1127 | } |
| 1128 | |
| 1129 | static int lttng_event_context_app_serialize( |
| 1130 | struct lttng_event_context *context, |
| 1131 | struct lttng_payload *payload) |
| 1132 | { |
| 1133 | int ret; |
| 1134 | struct lttng_event_context_app_comm comm = {}; |
| 1135 | size_t provider_len, ctx_len; |
| 1136 | const char *provider_name; |
| 1137 | const char *ctx_name; |
| 1138 | |
| 1139 | assert(payload); |
| 1140 | assert(context); |
| 1141 | assert(context->ctx == LTTNG_EVENT_CONTEXT_APP_CONTEXT); |
| 1142 | |
| 1143 | provider_name = context->u.app_ctx.provider_name; |
| 1144 | ctx_name = context->u.app_ctx.ctx_name; |
| 1145 | |
| 1146 | if (!provider_name || !ctx_name) { |
| 1147 | ret = -LTTNG_ERR_INVALID; |
| 1148 | goto end; |
| 1149 | } |
| 1150 | |
| 1151 | provider_len = strlen(provider_name); |
| 1152 | if (provider_len == 0) { |
| 1153 | ret = -LTTNG_ERR_INVALID; |
| 1154 | goto end; |
| 1155 | } |
| 1156 | |
| 1157 | /* Include the null terminator. */ |
| 1158 | provider_len += 1; |
| 1159 | comm.provider_name_len = provider_len; |
| 1160 | |
| 1161 | ctx_len = strlen(ctx_name); |
| 1162 | if (ctx_len == 0) { |
| 1163 | ret = -LTTNG_ERR_INVALID; |
| 1164 | goto end; |
| 1165 | } |
| 1166 | |
| 1167 | /* Include the null terminator. */ |
| 1168 | ctx_len += 1; |
| 1169 | comm.ctx_name_len = ctx_len; |
| 1170 | |
| 1171 | /* Header */ |
| 1172 | ret = lttng_dynamic_buffer_append(&payload->buffer, &comm, |
| 1173 | sizeof(comm)); |
| 1174 | if (ret) { |
| 1175 | ret = -1; |
| 1176 | goto end; |
| 1177 | } |
| 1178 | |
| 1179 | ret = lttng_dynamic_buffer_append(&payload->buffer, provider_name, |
| 1180 | provider_len); |
| 1181 | if (ret) { |
| 1182 | ret = -1; |
| 1183 | goto end; |
| 1184 | } |
| 1185 | |
| 1186 | ret = lttng_dynamic_buffer_append(&payload->buffer, ctx_name, |
| 1187 | ctx_len); |
| 1188 | if (ret) { |
| 1189 | ret = -1; |
| 1190 | goto end; |
| 1191 | } |
| 1192 | |
| 1193 | end: |
| 1194 | return ret; |
| 1195 | } |
| 1196 | |
| 1197 | static int lttng_event_context_perf_counter_serialize( |
| 1198 | struct lttng_event_perf_counter_ctx *context, |
| 1199 | struct lttng_payload *payload) |
| 1200 | { |
| 1201 | int ret; |
| 1202 | struct lttng_event_context_perf_counter_comm comm = {}; |
| 1203 | |
| 1204 | assert(payload); |
| 1205 | assert(context); |
| 1206 | |
| 1207 | comm.config = context->config; |
| 1208 | comm.type = context->type; |
| 1209 | comm.name_len = lttng_strnlen(context->name, sizeof(context->name)); |
| 1210 | |
| 1211 | if (comm.name_len == sizeof(context->name)) { |
| 1212 | ret = -1; |
| 1213 | goto end; |
| 1214 | } |
| 1215 | |
| 1216 | /* Include the null terminator. */ |
| 1217 | comm.name_len += 1; |
| 1218 | |
| 1219 | /* Header */ |
| 1220 | ret = lttng_dynamic_buffer_append(&payload->buffer, &comm, |
| 1221 | sizeof(comm)); |
| 1222 | if (ret) { |
| 1223 | ret = -1; |
| 1224 | goto end; |
| 1225 | } |
| 1226 | |
| 1227 | ret = lttng_dynamic_buffer_append(&payload->buffer, context->name, |
| 1228 | comm.name_len); |
| 1229 | if (ret) { |
| 1230 | ret = -1; |
| 1231 | goto end; |
| 1232 | } |
| 1233 | |
| 1234 | end: |
| 1235 | return ret; |
| 1236 | } |
| 1237 | |
| 1238 | int lttng_event_context_serialize(struct lttng_event_context *context, |
| 1239 | struct lttng_payload *payload) |
| 1240 | { |
| 1241 | int ret; |
| 1242 | struct lttng_event_context_comm context_comm = { 0 }; |
| 1243 | |
| 1244 | assert(context); |
| 1245 | assert(payload); |
| 1246 | |
| 1247 | context_comm.type = (uint32_t) context->ctx; |
| 1248 | |
| 1249 | /* Header */ |
| 1250 | ret = lttng_dynamic_buffer_append( |
| 1251 | &payload->buffer, &context_comm, sizeof(context_comm)); |
| 1252 | if (ret) { |
| 1253 | goto end; |
| 1254 | } |
| 1255 | |
| 1256 | switch (context->ctx) { |
| 1257 | case LTTNG_EVENT_CONTEXT_APP_CONTEXT: |
| 1258 | ret = lttng_event_context_app_serialize(context, payload); |
| 1259 | break; |
| 1260 | case LTTNG_EVENT_CONTEXT_PERF_COUNTER: |
| 1261 | case LTTNG_EVENT_CONTEXT_PERF_THREAD_COUNTER: |
| 1262 | case LTTNG_EVENT_CONTEXT_PERF_CPU_COUNTER: |
| 1263 | ret = lttng_event_context_perf_counter_serialize( |
| 1264 | &context->u.perf_counter, payload); |
| 1265 | break; |
| 1266 | default: |
| 1267 | /* Nothing else to serialize. */ |
| 1268 | break; |
| 1269 | } |
| 1270 | |
| 1271 | if (ret) { |
| 1272 | goto end; |
| 1273 | } |
| 1274 | |
| 1275 | end: |
| 1276 | return ret; |
| 1277 | } |
| 1278 | |
| 1279 | void lttng_event_context_destroy(struct lttng_event_context *context) |
| 1280 | { |
| 1281 | if (!context) { |
| 1282 | return; |
| 1283 | } |
| 1284 | |
| 1285 | if (context->ctx == LTTNG_EVENT_CONTEXT_APP_CONTEXT) { |
| 1286 | free(context->u.app_ctx.provider_name); |
| 1287 | free(context->u.app_ctx.ctx_name); |
| 1288 | } |
| 1289 | |
| 1290 | free(context); |
| 1291 | } |
| 1292 | |
| 1293 | /* |
| 1294 | * This is a specialized populate for lttng_event_field since it ignores |
| 1295 | * the extension field of the lttng_event struct and simply copies what it can |
| 1296 | * to the internal struct lttng_event of a lttng_event_field. |
| 1297 | */ |
| 1298 | static void lttng_event_field_populate_lttng_event_from_event( |
| 1299 | const struct lttng_event *src, struct lttng_event *destination) |
| 1300 | { |
| 1301 | memcpy(destination, src, sizeof(*destination)); |
| 1302 | |
| 1303 | /* Remove all possible dynamic data from the destination event rule. */ |
| 1304 | destination->extended.ptr = NULL; |
| 1305 | } |
| 1306 | |
| 1307 | ssize_t lttng_event_field_create_from_payload( |
| 1308 | struct lttng_payload_view *view, |
| 1309 | struct lttng_event_field **field) |
| 1310 | { |
| 1311 | ssize_t ret, offset = 0; |
| 1312 | struct lttng_event_field *local_event_field = NULL; |
| 1313 | struct lttng_event *event = NULL; |
| 1314 | const struct lttng_event_field_comm *comm; |
| 1315 | const char* name = NULL; |
| 1316 | |
| 1317 | assert(field); |
| 1318 | assert(view); |
| 1319 | |
| 1320 | { |
| 1321 | const struct lttng_buffer_view comm_view = |
| 1322 | lttng_buffer_view_from_view( |
| 1323 | &view->buffer, offset, |
| 1324 | sizeof(*comm)); |
| 1325 | |
| 1326 | if (!lttng_buffer_view_is_valid(&comm_view)) { |
| 1327 | ret = -1; |
| 1328 | goto end; |
| 1329 | } |
| 1330 | |
| 1331 | /* lttng_event_field_comm header */ |
| 1332 | comm = (const lttng_event_field_comm *) comm_view.data; |
| 1333 | offset += sizeof(*comm); |
| 1334 | } |
| 1335 | |
| 1336 | local_event_field = (struct lttng_event_field *) |
| 1337 | zmalloc(sizeof(*local_event_field)); |
| 1338 | if (!local_event_field) { |
| 1339 | ret = -1; |
| 1340 | goto end; |
| 1341 | } |
| 1342 | |
| 1343 | local_event_field->type = (lttng_event_field_type) comm->type; |
| 1344 | local_event_field->nowrite = comm->nowrite; |
| 1345 | |
| 1346 | /* Field name */ |
| 1347 | { |
| 1348 | const struct lttng_buffer_view name_view = |
| 1349 | lttng_buffer_view_from_view( |
| 1350 | &view->buffer, offset, |
| 1351 | comm->name_len); |
| 1352 | |
| 1353 | if (!lttng_buffer_view_is_valid(&name_view)) { |
| 1354 | ret = -1; |
| 1355 | goto end; |
| 1356 | } |
| 1357 | |
| 1358 | name = name_view.data; |
| 1359 | |
| 1360 | if (!lttng_buffer_view_contains_string(&name_view, |
| 1361 | name_view.data, comm->name_len)) { |
| 1362 | ret = -1; |
| 1363 | goto end; |
| 1364 | } |
| 1365 | |
| 1366 | if (comm->name_len > LTTNG_SYMBOL_NAME_LEN - 1) { |
| 1367 | /* Name is too long.*/ |
| 1368 | ret = -1; |
| 1369 | goto end; |
| 1370 | } |
| 1371 | |
| 1372 | offset += comm->name_len; |
| 1373 | } |
| 1374 | |
| 1375 | /* Event */ |
| 1376 | { |
| 1377 | struct lttng_payload_view event_view = |
| 1378 | lttng_payload_view_from_view( |
| 1379 | view, offset, |
| 1380 | comm->event_len); |
| 1381 | |
| 1382 | if (!lttng_payload_view_is_valid(&event_view)) { |
| 1383 | ret = -1; |
| 1384 | goto end; |
| 1385 | } |
| 1386 | |
| 1387 | ret = lttng_event_create_from_payload(&event_view, &event, NULL, |
| 1388 | NULL, NULL); |
| 1389 | if (ret != comm->event_len) { |
| 1390 | ret = -1; |
| 1391 | goto end; |
| 1392 | } |
| 1393 | |
| 1394 | offset += ret; |
| 1395 | } |
| 1396 | |
| 1397 | assert(name); |
| 1398 | assert(event); |
| 1399 | |
| 1400 | if (lttng_strncpy(local_event_field->field_name, name, |
| 1401 | sizeof(local_event_field->field_name))) { |
| 1402 | ret = -1; |
| 1403 | goto end; |
| 1404 | } |
| 1405 | |
| 1406 | lttng_event_field_populate_lttng_event_from_event( |
| 1407 | event, &local_event_field->event); |
| 1408 | |
| 1409 | *field = local_event_field; |
| 1410 | local_event_field = NULL; |
| 1411 | ret = offset; |
| 1412 | end: |
| 1413 | lttng_event_destroy(event); |
| 1414 | free(local_event_field); |
| 1415 | return ret; |
| 1416 | } |
| 1417 | |
| 1418 | int lttng_event_field_serialize(const struct lttng_event_field *field, |
| 1419 | struct lttng_payload *payload) |
| 1420 | { |
| 1421 | int ret; |
| 1422 | size_t header_offset, size_before_event; |
| 1423 | size_t name_len; |
| 1424 | struct lttng_event_field_comm event_field_comm = {}; |
| 1425 | struct lttng_event_field_comm *header; |
| 1426 | |
| 1427 | assert(field); |
| 1428 | assert(payload); |
| 1429 | |
| 1430 | /* Save the header location for later in-place header update. */ |
| 1431 | header_offset = payload->buffer.size; |
| 1432 | |
| 1433 | name_len = strnlen(field->field_name, sizeof(field->field_name)); |
| 1434 | if (name_len == sizeof(field->field_name)) { |
| 1435 | /* Event name is not NULL-terminated. */ |
| 1436 | ret = -1; |
| 1437 | goto end; |
| 1438 | } |
| 1439 | |
| 1440 | /* Add null termination. */ |
| 1441 | name_len += 1; |
| 1442 | |
| 1443 | event_field_comm.type = field->type; |
| 1444 | event_field_comm.nowrite = (uint8_t)field->nowrite; |
| 1445 | event_field_comm.name_len = name_len; |
| 1446 | |
| 1447 | /* Header */ |
| 1448 | ret = lttng_dynamic_buffer_append( |
| 1449 | &payload->buffer, &event_field_comm, |
| 1450 | sizeof(event_field_comm)); |
| 1451 | if (ret) { |
| 1452 | goto end; |
| 1453 | } |
| 1454 | |
| 1455 | /* Field name */ |
| 1456 | ret = lttng_dynamic_buffer_append(&payload->buffer, field->field_name, |
| 1457 | name_len); |
| 1458 | if (ret) { |
| 1459 | goto end; |
| 1460 | } |
| 1461 | |
| 1462 | size_before_event = payload->buffer.size; |
| 1463 | ret = lttng_event_serialize( |
| 1464 | &field->event, 0, NULL, NULL, 0, 0, payload); |
| 1465 | if (ret) { |
| 1466 | ret = -1; |
| 1467 | goto end; |
| 1468 | } |
| 1469 | |
| 1470 | /* Update the event len. */ |
| 1471 | header = (struct lttng_event_field_comm *) |
| 1472 | ((char *) payload->buffer.data + |
| 1473 | header_offset); |
| 1474 | header->event_len = payload->buffer.size - size_before_event; |
| 1475 | |
| 1476 | end: |
| 1477 | return ret; |
| 1478 | } |
| 1479 | |
| 1480 | static enum lttng_error_code compute_flattened_size( |
| 1481 | struct lttng_dynamic_pointer_array *events, size_t *size) |
| 1482 | { |
| 1483 | enum lttng_error_code ret_code; |
| 1484 | int ret = 0; |
| 1485 | size_t storage_req, event_count, i; |
| 1486 | |
| 1487 | assert(size); |
| 1488 | assert(events); |
| 1489 | |
| 1490 | event_count = lttng_dynamic_pointer_array_get_count(events); |
| 1491 | |
| 1492 | /* The basic struct lttng_event */ |
| 1493 | storage_req = event_count * sizeof(struct lttng_event); |
| 1494 | |
| 1495 | /* The struct·lttng_event_extended */ |
| 1496 | storage_req += event_count * sizeof(struct lttng_event_extended); |
| 1497 | |
| 1498 | for (i = 0; i < event_count; i++) { |
| 1499 | int probe_storage_req = 0; |
| 1500 | const struct event_list_element *element = (const struct event_list_element *) |
| 1501 | lttng_dynamic_pointer_array_get_pointer( |
| 1502 | events, i); |
| 1503 | const struct lttng_userspace_probe_location *location = NULL; |
| 1504 | |
| 1505 | location = lttng_event_get_userspace_probe_location( |
| 1506 | element->event); |
| 1507 | if (location) { |
| 1508 | ret = lttng_userspace_probe_location_flatten( |
| 1509 | location, NULL); |
| 1510 | if (ret < 0) { |
| 1511 | ret_code = LTTNG_ERR_PROBE_LOCATION_INVAL; |
| 1512 | goto end; |
| 1513 | } |
| 1514 | |
| 1515 | probe_storage_req = ret; |
| 1516 | } |
| 1517 | |
| 1518 | if (element->filter_expression) { |
| 1519 | storage_req += strlen(element->filter_expression) + 1; |
| 1520 | } |
| 1521 | |
| 1522 | if (element->exclusions) { |
| 1523 | storage_req += element->exclusions->count * |
| 1524 | LTTNG_SYMBOL_NAME_LEN; |
| 1525 | } |
| 1526 | |
| 1527 | /* Padding to ensure the flat probe is aligned. */ |
| 1528 | storage_req = lttng_align_ceil(storage_req, sizeof(uint64_t)); |
| 1529 | storage_req += probe_storage_req; |
| 1530 | } |
| 1531 | |
| 1532 | *size = storage_req; |
| 1533 | ret_code = LTTNG_OK; |
| 1534 | |
| 1535 | end: |
| 1536 | return ret_code; |
| 1537 | } |
| 1538 | |
| 1539 | /* |
| 1540 | * Flatten a list of struct lttng_event. |
| 1541 | * |
| 1542 | * The buffer that is returned to the API client must contain a "flat" version |
| 1543 | * of the events that are returned. In other words, all pointers within an |
| 1544 | * lttng_event must point to a location within the returned buffer so that the |
| 1545 | * user may free everything by simply calling free() on the returned buffer. |
| 1546 | * This is needed in order to maintain API compatibility. |
| 1547 | * |
| 1548 | * A first pass is performed to compute the size of the buffer that must be |
| 1549 | * allocated. A second pass is then performed to setup the returned events so |
| 1550 | * that their members always point within the buffer. |
| 1551 | * |
| 1552 | * The layout of the returned buffer is as follows: |
| 1553 | * - struct lttng_event[nb_events], |
| 1554 | * - nb_events times the following: |
| 1555 | * - struct lttng_event_extended, |
| 1556 | * - filter_expression |
| 1557 | * - exclusions |
| 1558 | * - padding to align to 64-bits |
| 1559 | * - flattened version of userspace_probe_location |
| 1560 | */ |
| 1561 | static enum lttng_error_code flatten_lttng_events( |
| 1562 | struct lttng_dynamic_pointer_array *events, |
| 1563 | struct lttng_event **flattened_events) |
| 1564 | { |
| 1565 | enum lttng_error_code ret_code; |
| 1566 | int ret, i; |
| 1567 | size_t storage_req; |
| 1568 | struct lttng_dynamic_buffer local_flattened_events; |
| 1569 | int nb_events; |
| 1570 | |
| 1571 | assert(events); |
| 1572 | assert(flattened_events); |
| 1573 | |
| 1574 | lttng_dynamic_buffer_init(&local_flattened_events); |
| 1575 | nb_events = lttng_dynamic_pointer_array_get_count(events); |
| 1576 | |
| 1577 | ret_code = compute_flattened_size(events, &storage_req); |
| 1578 | if (ret_code != LTTNG_OK) { |
| 1579 | goto end; |
| 1580 | } |
| 1581 | |
| 1582 | /* |
| 1583 | * We must ensure that "local_flattened_events" is never resized so as |
| 1584 | * to preserve the validity of the flattened objects. |
| 1585 | */ |
| 1586 | ret = lttng_dynamic_buffer_set_capacity( |
| 1587 | &local_flattened_events, storage_req); |
| 1588 | if (ret) { |
| 1589 | ret_code = LTTNG_ERR_NOMEM; |
| 1590 | goto end; |
| 1591 | } |
| 1592 | |
| 1593 | /* Start by laying the struct lttng_event */ |
| 1594 | for (i = 0; i < nb_events; i++) { |
| 1595 | const struct event_list_element *element = (const struct event_list_element *) |
| 1596 | lttng_dynamic_pointer_array_get_pointer( |
| 1597 | events, i); |
| 1598 | |
| 1599 | if (!element) { |
| 1600 | ret_code = LTTNG_ERR_FATAL; |
| 1601 | goto end; |
| 1602 | } |
| 1603 | |
| 1604 | ret = lttng_dynamic_buffer_append(&local_flattened_events, |
| 1605 | element->event, sizeof(struct lttng_event)); |
| 1606 | if (ret) { |
| 1607 | ret_code = LTTNG_ERR_NOMEM; |
| 1608 | goto end; |
| 1609 | } |
| 1610 | } |
| 1611 | |
| 1612 | for (i = 0; i < nb_events; i++) { |
| 1613 | const struct event_list_element *element = (const struct event_list_element *) |
| 1614 | lttng_dynamic_pointer_array_get_pointer(events, i); |
| 1615 | struct lttng_event *event = (struct lttng_event *) |
| 1616 | (local_flattened_events.data + (sizeof(struct lttng_event) * i)); |
| 1617 | struct lttng_event_extended *event_extended = |
| 1618 | (struct lttng_event_extended *) |
| 1619 | (local_flattened_events.data + local_flattened_events.size); |
| 1620 | const struct lttng_userspace_probe_location *location = NULL; |
| 1621 | |
| 1622 | assert(element); |
| 1623 | |
| 1624 | /* Insert struct lttng_event_extended. */ |
| 1625 | ret = lttng_dynamic_buffer_set_size(&local_flattened_events, |
| 1626 | local_flattened_events.size + |
| 1627 | sizeof(*event_extended)); |
| 1628 | if (ret) { |
| 1629 | ret_code = LTTNG_ERR_NOMEM; |
| 1630 | goto end; |
| 1631 | } |
| 1632 | event->extended.ptr = event_extended; |
| 1633 | |
| 1634 | /* Insert filter expression. */ |
| 1635 | if (element->filter_expression) { |
| 1636 | const size_t len = strlen(element->filter_expression) + 1; |
| 1637 | |
| 1638 | event_extended->filter_expression = |
| 1639 | local_flattened_events.data + |
| 1640 | local_flattened_events.size; |
| 1641 | ret = lttng_dynamic_buffer_append( |
| 1642 | &local_flattened_events, |
| 1643 | element->filter_expression, len); |
| 1644 | if (ret) { |
| 1645 | ret_code = LTTNG_ERR_NOMEM; |
| 1646 | goto end; |
| 1647 | } |
| 1648 | } |
| 1649 | |
| 1650 | /* Insert exclusions. */ |
| 1651 | if (element->exclusions) { |
| 1652 | event_extended->exclusions.count = |
| 1653 | element->exclusions->count; |
| 1654 | event_extended->exclusions.strings = |
| 1655 | local_flattened_events.data + |
| 1656 | local_flattened_events.size; |
| 1657 | |
| 1658 | ret = lttng_dynamic_buffer_append( |
| 1659 | &local_flattened_events, |
| 1660 | element->exclusions->names, |
| 1661 | element->exclusions->count * |
| 1662 | LTTNG_SYMBOL_NAME_LEN); |
| 1663 | if (ret) { |
| 1664 | ret_code = LTTNG_ERR_NOMEM; |
| 1665 | goto end; |
| 1666 | } |
| 1667 | } |
| 1668 | |
| 1669 | /* Insert padding to align to 64-bits. */ |
| 1670 | ret = lttng_dynamic_buffer_set_size(&local_flattened_events, |
| 1671 | lttng_align_ceil(local_flattened_events.size, |
| 1672 | sizeof(uint64_t))); |
| 1673 | if (ret) { |
| 1674 | ret_code = LTTNG_ERR_NOMEM; |
| 1675 | goto end; |
| 1676 | } |
| 1677 | |
| 1678 | location = lttng_event_get_userspace_probe_location( |
| 1679 | element->event); |
| 1680 | if (location) { |
| 1681 | event_extended->probe_location = (struct lttng_userspace_probe_location *) |
| 1682 | (local_flattened_events.data + local_flattened_events.size); |
| 1683 | ret = lttng_userspace_probe_location_flatten( |
| 1684 | location, &local_flattened_events); |
| 1685 | if (ret < 0) { |
| 1686 | ret_code = LTTNG_ERR_PROBE_LOCATION_INVAL; |
| 1687 | goto end; |
| 1688 | } |
| 1689 | } |
| 1690 | } |
| 1691 | |
| 1692 | /* Don't reset local_flattened_events buffer as we return its content. */ |
| 1693 | *flattened_events = (struct lttng_event *) local_flattened_events.data; |
| 1694 | lttng_dynamic_buffer_init(&local_flattened_events); |
| 1695 | ret_code = LTTNG_OK; |
| 1696 | end: |
| 1697 | lttng_dynamic_buffer_reset(&local_flattened_events); |
| 1698 | return ret_code; |
| 1699 | } |
| 1700 | |
| 1701 | static enum lttng_error_code event_list_create_from_payload( |
| 1702 | struct lttng_payload_view *view, |
| 1703 | unsigned int count, |
| 1704 | struct lttng_dynamic_pointer_array *event_list) |
| 1705 | { |
| 1706 | enum lttng_error_code ret_code; |
| 1707 | int ret; |
| 1708 | unsigned int i; |
| 1709 | int offset = 0; |
| 1710 | |
| 1711 | assert(view); |
| 1712 | assert(event_list); |
| 1713 | |
| 1714 | for (i = 0; i < count; i++) { |
| 1715 | ssize_t event_size; |
| 1716 | struct lttng_payload_view event_view = |
| 1717 | lttng_payload_view_from_view(view, offset, -1); |
| 1718 | struct event_list_element *element = |
| 1719 | (struct event_list_element *) zmalloc(sizeof(*element)); |
| 1720 | |
| 1721 | if (!element) { |
| 1722 | ret_code = LTTNG_ERR_NOMEM; |
| 1723 | goto end; |
| 1724 | } |
| 1725 | |
| 1726 | /* |
| 1727 | * Lifetime and management of the object is now bound to the |
| 1728 | * array. |
| 1729 | */ |
| 1730 | ret = lttng_dynamic_pointer_array_add_pointer( |
| 1731 | event_list, element); |
| 1732 | if (ret) { |
| 1733 | event_list_destructor(element); |
| 1734 | ret_code = LTTNG_ERR_NOMEM; |
| 1735 | goto end; |
| 1736 | } |
| 1737 | |
| 1738 | /* |
| 1739 | * Bytecode is not transmitted on listing in any case we do not |
| 1740 | * care about it. |
| 1741 | */ |
| 1742 | event_size = lttng_event_create_from_payload(&event_view, |
| 1743 | &element->event, |
| 1744 | &element->exclusions, |
| 1745 | &element->filter_expression, NULL); |
| 1746 | if (event_size < 0) { |
| 1747 | ret_code = LTTNG_ERR_INVALID; |
| 1748 | goto end; |
| 1749 | } |
| 1750 | |
| 1751 | offset += event_size; |
| 1752 | } |
| 1753 | |
| 1754 | if (view->buffer.size != offset) { |
| 1755 | ret_code = LTTNG_ERR_INVALID_PROTOCOL; |
| 1756 | goto end; |
| 1757 | } |
| 1758 | |
| 1759 | ret_code = LTTNG_OK; |
| 1760 | |
| 1761 | end: |
| 1762 | return ret_code; |
| 1763 | } |
| 1764 | |
| 1765 | enum lttng_error_code lttng_events_create_and_flatten_from_payload( |
| 1766 | struct lttng_payload_view *payload, |
| 1767 | unsigned int count, |
| 1768 | struct lttng_event **events) |
| 1769 | { |
| 1770 | enum lttng_error_code ret = LTTNG_OK; |
| 1771 | struct lttng_dynamic_pointer_array local_events; |
| 1772 | |
| 1773 | lttng_dynamic_pointer_array_init(&local_events, event_list_destructor); |
| 1774 | |
| 1775 | /* Deserialize the events. */ |
| 1776 | { |
| 1777 | struct lttng_payload_view events_view = |
| 1778 | lttng_payload_view_from_view(payload, 0, -1); |
| 1779 | |
| 1780 | ret = event_list_create_from_payload( |
| 1781 | &events_view, count, &local_events); |
| 1782 | if (ret != LTTNG_OK) { |
| 1783 | goto end; |
| 1784 | } |
| 1785 | } |
| 1786 | |
| 1787 | ret = flatten_lttng_events(&local_events, events); |
| 1788 | if (ret != LTTNG_OK) { |
| 1789 | goto end; |
| 1790 | } |
| 1791 | |
| 1792 | end: |
| 1793 | lttng_dynamic_pointer_array_reset(&local_events); |
| 1794 | return ret; |
| 1795 | } |
| 1796 | |
| 1797 | static enum lttng_error_code flatten_lttng_event_fields( |
| 1798 | struct lttng_dynamic_pointer_array *event_fields, |
| 1799 | struct lttng_event_field **flattened_event_fields) |
| 1800 | { |
| 1801 | int ret, i; |
| 1802 | enum lttng_error_code ret_code; |
| 1803 | size_t storage_req = 0; |
| 1804 | struct lttng_dynamic_buffer local_flattened_event_fields; |
| 1805 | int nb_event_field; |
| 1806 | |
| 1807 | assert(event_fields); |
| 1808 | assert(flattened_event_fields); |
| 1809 | |
| 1810 | lttng_dynamic_buffer_init(&local_flattened_event_fields); |
| 1811 | nb_event_field = lttng_dynamic_pointer_array_get_count(event_fields); |
| 1812 | |
| 1813 | /* |
| 1814 | * Here even if the event field contains a `struct lttng_event` that |
| 1815 | * could contain dynamic data, in reality it is not the case. |
| 1816 | * Dynamic data is not present. Here the flattening is mostly a direct |
| 1817 | * memcpy. This is less than ideal but this code is still better than |
| 1818 | * direct usage of an unpacked lttng_event_field array. |
| 1819 | */ |
| 1820 | storage_req += sizeof(struct lttng_event_field) * nb_event_field; |
| 1821 | |
| 1822 | lttng_dynamic_buffer_init(&local_flattened_event_fields); |
| 1823 | |
| 1824 | /* |
| 1825 | * We must ensure that "local_flattened_event_fields" is never resized |
| 1826 | * so as to preserve the validity of the flattened objects. |
| 1827 | */ |
| 1828 | ret = lttng_dynamic_buffer_set_capacity( |
| 1829 | &local_flattened_event_fields, storage_req); |
| 1830 | if (ret) { |
| 1831 | ret_code = LTTNG_ERR_NOMEM; |
| 1832 | goto end; |
| 1833 | } |
| 1834 | |
| 1835 | for (i = 0; i < nb_event_field; i++) { |
| 1836 | const struct lttng_event_field *element = |
| 1837 | (const struct lttng_event_field *) |
| 1838 | lttng_dynamic_pointer_array_get_pointer( |
| 1839 | event_fields, i); |
| 1840 | |
| 1841 | if (!element) { |
| 1842 | ret_code = LTTNG_ERR_FATAL; |
| 1843 | goto end; |
| 1844 | } |
| 1845 | ret = lttng_dynamic_buffer_append(&local_flattened_event_fields, |
| 1846 | element, sizeof(struct lttng_event_field)); |
| 1847 | if (ret) { |
| 1848 | ret_code = LTTNG_ERR_NOMEM; |
| 1849 | goto end; |
| 1850 | } |
| 1851 | } |
| 1852 | |
| 1853 | /* Don't reset local_flattened_channels buffer as we return its content. */ |
| 1854 | *flattened_event_fields = (struct lttng_event_field *) local_flattened_event_fields.data; |
| 1855 | lttng_dynamic_buffer_init(&local_flattened_event_fields); |
| 1856 | ret_code = LTTNG_OK; |
| 1857 | end: |
| 1858 | lttng_dynamic_buffer_reset(&local_flattened_event_fields); |
| 1859 | return ret_code; |
| 1860 | } |
| 1861 | |
| 1862 | static enum lttng_error_code event_field_list_create_from_payload( |
| 1863 | struct lttng_payload_view *view, |
| 1864 | unsigned int count, |
| 1865 | struct lttng_dynamic_pointer_array **event_field_list) |
| 1866 | { |
| 1867 | enum lttng_error_code ret_code; |
| 1868 | int ret, offset = 0; |
| 1869 | unsigned int i; |
| 1870 | struct lttng_dynamic_pointer_array *list = NULL; |
| 1871 | |
| 1872 | assert(view); |
| 1873 | assert(event_field_list); |
| 1874 | |
| 1875 | list = (struct lttng_dynamic_pointer_array *) zmalloc(sizeof(*list)); |
| 1876 | if (!list) { |
| 1877 | ret_code = LTTNG_ERR_NOMEM; |
| 1878 | goto end; |
| 1879 | } |
| 1880 | |
| 1881 | lttng_dynamic_pointer_array_init(list, free); |
| 1882 | |
| 1883 | for (i = 0; i < count; i++) { |
| 1884 | ssize_t event_field_size; |
| 1885 | struct lttng_event_field *field = NULL; |
| 1886 | struct lttng_payload_view event_field_view = |
| 1887 | lttng_payload_view_from_view(view, offset, -1); |
| 1888 | |
| 1889 | event_field_size = lttng_event_field_create_from_payload( |
| 1890 | &event_field_view, &field); |
| 1891 | if (event_field_size < 0) { |
| 1892 | ret_code = LTTNG_ERR_INVALID; |
| 1893 | goto end; |
| 1894 | } |
| 1895 | |
| 1896 | /* Lifetime and management of the object is now bound to the array. */ |
| 1897 | ret = lttng_dynamic_pointer_array_add_pointer(list, field); |
| 1898 | if (ret) { |
| 1899 | free(field); |
| 1900 | ret_code = LTTNG_ERR_NOMEM; |
| 1901 | goto end; |
| 1902 | } |
| 1903 | |
| 1904 | offset += event_field_size; |
| 1905 | } |
| 1906 | |
| 1907 | if (view->buffer.size != offset) { |
| 1908 | ret_code = LTTNG_ERR_INVALID; |
| 1909 | goto end; |
| 1910 | } |
| 1911 | |
| 1912 | *event_field_list = list; |
| 1913 | list = NULL; |
| 1914 | ret_code = LTTNG_OK; |
| 1915 | |
| 1916 | end: |
| 1917 | if (list) { |
| 1918 | lttng_dynamic_pointer_array_reset(list); |
| 1919 | free(list); |
| 1920 | } |
| 1921 | |
| 1922 | return ret_code; |
| 1923 | } |
| 1924 | |
| 1925 | enum lttng_error_code lttng_event_fields_create_and_flatten_from_payload( |
| 1926 | struct lttng_payload_view *view, |
| 1927 | unsigned int count, |
| 1928 | struct lttng_event_field **fields) |
| 1929 | { |
| 1930 | enum lttng_error_code ret_code; |
| 1931 | struct lttng_dynamic_pointer_array *local_event_fields = NULL; |
| 1932 | |
| 1933 | ret_code = event_field_list_create_from_payload( |
| 1934 | view, count, &local_event_fields); |
| 1935 | if (ret_code != LTTNG_OK) { |
| 1936 | goto end; |
| 1937 | } |
| 1938 | |
| 1939 | ret_code = flatten_lttng_event_fields(local_event_fields, fields); |
| 1940 | if (ret_code != LTTNG_OK) { |
| 1941 | goto end; |
| 1942 | } |
| 1943 | end: |
| 1944 | if (local_event_fields) { |
| 1945 | lttng_dynamic_pointer_array_reset(local_event_fields); |
| 1946 | free(local_event_fields); |
| 1947 | } |
| 1948 | |
| 1949 | return ret_code; |
| 1950 | } |