| 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 | free(local_attr); |
| 198 | return ret; |
| 199 | } |
| 200 | |
| 201 | static ssize_t lttng_event_function_attr_create_from_buffer( |
| 202 | const struct lttng_buffer_view *view, |
| 203 | struct lttng_event_function_attr **function_attr) |
| 204 | { |
| 205 | ssize_t ret, offset = 0; |
| 206 | const struct lttng_event_function_attr_comm *comm; |
| 207 | struct lttng_event_function_attr *local_attr = NULL; |
| 208 | const struct lttng_buffer_view comm_view = lttng_buffer_view_from_view( |
| 209 | view, offset, sizeof(*comm)); |
| 210 | |
| 211 | if (!lttng_buffer_view_is_valid(&comm_view)) { |
| 212 | ret = -1; |
| 213 | goto end; |
| 214 | } |
| 215 | |
| 216 | comm = (typeof(comm)) view->data; |
| 217 | offset += sizeof(*comm); |
| 218 | |
| 219 | local_attr = zmalloc(sizeof(*local_attr)); |
| 220 | if (local_attr == NULL) { |
| 221 | ret = -1; |
| 222 | goto end; |
| 223 | } |
| 224 | |
| 225 | { |
| 226 | const char *name; |
| 227 | const struct lttng_buffer_view name_view = |
| 228 | lttng_buffer_view_from_view(view, offset, |
| 229 | comm->symbol_name_len); |
| 230 | if (!lttng_buffer_view_is_valid(&name_view)) { |
| 231 | ret = -1; |
| 232 | goto end; |
| 233 | } |
| 234 | |
| 235 | name = name_view.data; |
| 236 | |
| 237 | if (!lttng_buffer_view_contains_string( |
| 238 | &name_view, name, comm->symbol_name_len)) { |
| 239 | ret = -1; |
| 240 | goto end; |
| 241 | } |
| 242 | |
| 243 | ret = lttng_strncpy(local_attr->symbol_name, name, |
| 244 | LTTNG_SYMBOL_NAME_LEN); |
| 245 | if (ret) { |
| 246 | ret = -1; |
| 247 | goto end; |
| 248 | } |
| 249 | offset += comm->symbol_name_len; |
| 250 | } |
| 251 | |
| 252 | *function_attr = local_attr; |
| 253 | local_attr = NULL; |
| 254 | ret = offset; |
| 255 | end: |
| 256 | free(local_attr); |
| 257 | return ret; |
| 258 | } |
| 259 | |
| 260 | static ssize_t lttng_event_exclusions_create_from_buffer(const struct lttng_buffer_view *view, |
| 261 | uint32_t count, struct lttng_event_exclusion **exclusions) |
| 262 | { |
| 263 | ssize_t ret, offset = 0; |
| 264 | size_t size = (count * LTTNG_SYMBOL_NAME_LEN); |
| 265 | uint32_t i; |
| 266 | const struct lttng_event_exclusion_comm *comm; |
| 267 | struct lttng_event_exclusion *local_exclusions; |
| 268 | |
| 269 | |
| 270 | local_exclusions = zmalloc(sizeof(struct lttng_event_exclusion) + size); |
| 271 | if (!local_exclusions) { |
| 272 | ret = -1; |
| 273 | goto end; |
| 274 | } |
| 275 | local_exclusions->count = count; |
| 276 | |
| 277 | for (i = 0; i < count; i++) { |
| 278 | const char *string; |
| 279 | struct lttng_buffer_view string_view; |
| 280 | const struct lttng_buffer_view comm_view = |
| 281 | lttng_buffer_view_from_view( |
| 282 | view, offset, sizeof(*comm)); |
| 283 | |
| 284 | if (!lttng_buffer_view_is_valid(&comm_view)) { |
| 285 | ret = -1; |
| 286 | goto end; |
| 287 | } |
| 288 | |
| 289 | comm = (typeof(comm)) comm_view.data; |
| 290 | offset += sizeof(*comm); |
| 291 | |
| 292 | string_view = lttng_buffer_view_from_view( |
| 293 | view, offset, comm->len); |
| 294 | |
| 295 | if (!lttng_buffer_view_is_valid(&string_view)) { |
| 296 | ret = -1; |
| 297 | goto end; |
| 298 | } |
| 299 | |
| 300 | string = string_view.data; |
| 301 | |
| 302 | if (!lttng_buffer_view_contains_string( |
| 303 | &string_view, string, comm->len)) { |
| 304 | ret = -1; |
| 305 | goto end; |
| 306 | } |
| 307 | |
| 308 | ret = lttng_strncpy( |
| 309 | local_exclusions->names[i], |
| 310 | string, comm->len); |
| 311 | if (ret) { |
| 312 | ret = -1; |
| 313 | goto end; |
| 314 | } |
| 315 | offset += comm->len; |
| 316 | } |
| 317 | |
| 318 | *exclusions = local_exclusions; |
| 319 | local_exclusions = NULL; |
| 320 | ret = offset; |
| 321 | end: |
| 322 | free(local_exclusions); |
| 323 | return ret; |
| 324 | } |
| 325 | |
| 326 | |
| 327 | LTTNG_HIDDEN |
| 328 | ssize_t lttng_event_create_from_buffer(const struct lttng_buffer_view *view, |
| 329 | struct lttng_event **event, |
| 330 | struct lttng_event_exclusion **exclusion, |
| 331 | char **filter_expression, |
| 332 | struct lttng_filter_bytecode **bytecode, |
| 333 | int sock) |
| 334 | { |
| 335 | ssize_t ret, offset = 0; |
| 336 | struct lttng_event *local_event = NULL; |
| 337 | struct lttng_event_exclusion *local_exclusions = NULL; |
| 338 | struct lttng_filter_bytecode *local_bytecode = NULL; |
| 339 | char *local_filter_expression = NULL; |
| 340 | const struct lttng_event_comm *event_comm; |
| 341 | struct lttng_event_function_attr *local_function_attr = NULL; |
| 342 | struct lttng_event_probe_attr *local_probe_attr = NULL; |
| 343 | struct lttng_userspace_probe_location *local_userspace_probe_location = |
| 344 | NULL; |
| 345 | int received_fd = -1; |
| 346 | |
| 347 | /* |
| 348 | * Only event is obligatory, the other output argument are optional and |
| 349 | * depends on what the caller is interested in. |
| 350 | */ |
| 351 | assert(event); |
| 352 | assert(view); |
| 353 | |
| 354 | { |
| 355 | const struct lttng_buffer_view comm_view = |
| 356 | lttng_buffer_view_from_view(view, offset, |
| 357 | sizeof(*event_comm)); |
| 358 | |
| 359 | if (!lttng_buffer_view_is_valid(&comm_view)) { |
| 360 | ret = -1; |
| 361 | goto end; |
| 362 | } |
| 363 | |
| 364 | /* lttng_event_comm header */ |
| 365 | event_comm = (typeof(event_comm)) comm_view.data; |
| 366 | offset += sizeof(*event_comm); |
| 367 | } |
| 368 | |
| 369 | local_event = lttng_event_create(); |
| 370 | if (local_event == NULL) { |
| 371 | ret = -1; |
| 372 | goto end; |
| 373 | } |
| 374 | |
| 375 | local_event->type = event_comm->event_type; |
| 376 | local_event->loglevel_type = event_comm->loglevel_type; |
| 377 | local_event->loglevel = event_comm->loglevel; |
| 378 | local_event->enabled = event_comm->enabled; |
| 379 | local_event->pid = event_comm->pid; |
| 380 | local_event->flags = event_comm->flags; |
| 381 | |
| 382 | { |
| 383 | const char *name; |
| 384 | const struct lttng_buffer_view name_view = |
| 385 | lttng_buffer_view_from_view(view, offset, |
| 386 | event_comm->name_len); |
| 387 | if (!lttng_buffer_view_is_valid(&name_view)) { |
| 388 | ret = -1; |
| 389 | goto end; |
| 390 | } |
| 391 | |
| 392 | name = name_view.data; |
| 393 | |
| 394 | if (!lttng_buffer_view_contains_string( |
| 395 | &name_view, name, event_comm->name_len)) { |
| 396 | ret = -1; |
| 397 | goto end; |
| 398 | } |
| 399 | |
| 400 | ret = lttng_strncpy( |
| 401 | local_event->name, name, LTTNG_SYMBOL_NAME_LEN); |
| 402 | if (ret) { |
| 403 | ret = -1; |
| 404 | goto end; |
| 405 | } |
| 406 | offset += event_comm->name_len; |
| 407 | } |
| 408 | |
| 409 | /* Exclusions */ |
| 410 | if (event_comm->exclusion_count == 0) { |
| 411 | goto deserialize_filter_expression; |
| 412 | } |
| 413 | |
| 414 | { |
| 415 | |
| 416 | const struct lttng_buffer_view exclusions_view = |
| 417 | lttng_buffer_view_from_view( |
| 418 | view, offset, -1); |
| 419 | |
| 420 | if (!lttng_buffer_view_is_valid(&exclusions_view)) { |
| 421 | ret = -1; |
| 422 | goto end; |
| 423 | } |
| 424 | |
| 425 | ret = lttng_event_exclusions_create_from_buffer(&exclusions_view, |
| 426 | event_comm->exclusion_count, &local_exclusions); |
| 427 | if (ret < 0) { |
| 428 | ret = -1; |
| 429 | goto end; |
| 430 | } |
| 431 | offset += ret; |
| 432 | |
| 433 | local_event->exclusion = 1; |
| 434 | } |
| 435 | |
| 436 | deserialize_filter_expression: |
| 437 | |
| 438 | if (event_comm->filter_expression_len == 0) { |
| 439 | if (event_comm->bytecode_len != 0) { |
| 440 | /* |
| 441 | * This is an invalid event payload. |
| 442 | * |
| 443 | * Filter expression without bytecode is possible but |
| 444 | * not the other way around. |
| 445 | * */ |
| 446 | ret = -1; |
| 447 | goto end; |
| 448 | } |
| 449 | goto deserialize_event_type_payload; |
| 450 | } |
| 451 | |
| 452 | { |
| 453 | const char *filter_expression_buffer; |
| 454 | const struct lttng_buffer_view filter_expression_view = |
| 455 | lttng_buffer_view_from_view(view, offset, |
| 456 | event_comm->filter_expression_len); |
| 457 | |
| 458 | if (!lttng_buffer_view_is_valid(&filter_expression_view)) { |
| 459 | ret = -1; |
| 460 | goto end; |
| 461 | } |
| 462 | |
| 463 | filter_expression_buffer = filter_expression_view.data; |
| 464 | |
| 465 | if (!lttng_buffer_view_contains_string(&filter_expression_view, |
| 466 | filter_expression_buffer, |
| 467 | event_comm->filter_expression_len)) { |
| 468 | ret = -1; |
| 469 | goto end; |
| 470 | } |
| 471 | |
| 472 | local_filter_expression = lttng_strndup( |
| 473 | filter_expression_buffer, |
| 474 | event_comm->filter_expression_len); |
| 475 | if (!local_filter_expression) { |
| 476 | ret = -1; |
| 477 | goto end; |
| 478 | } |
| 479 | |
| 480 | local_event->filter = 1; |
| 481 | |
| 482 | offset += event_comm->filter_expression_len; |
| 483 | } |
| 484 | |
| 485 | if (event_comm->bytecode_len == 0) { |
| 486 | /* |
| 487 | * Filter expression can be present but without bytecode |
| 488 | * when dealing with event listing. |
| 489 | */ |
| 490 | goto deserialize_event_type_payload; |
| 491 | } |
| 492 | |
| 493 | /* Bytecode */ |
| 494 | { |
| 495 | const struct lttng_buffer_view bytecode_view = |
| 496 | lttng_buffer_view_from_view(view, offset, |
| 497 | event_comm->bytecode_len); |
| 498 | |
| 499 | if (!lttng_buffer_view_is_valid(&bytecode_view)) { |
| 500 | ret = -1; |
| 501 | goto end; |
| 502 | } |
| 503 | |
| 504 | local_bytecode = zmalloc(event_comm->bytecode_len); |
| 505 | if (!local_bytecode) { |
| 506 | ret = -1; |
| 507 | goto end; |
| 508 | } |
| 509 | |
| 510 | memcpy(local_bytecode, bytecode_view.data, |
| 511 | event_comm->bytecode_len); |
| 512 | if ((local_bytecode->len + sizeof(*local_bytecode)) != |
| 513 | event_comm->bytecode_len) { |
| 514 | ret = -1; |
| 515 | goto end; |
| 516 | } |
| 517 | |
| 518 | offset += event_comm->bytecode_len; |
| 519 | } |
| 520 | |
| 521 | deserialize_event_type_payload: |
| 522 | /* Event type specific payload */ |
| 523 | switch (local_event->type) { |
| 524 | case LTTNG_EVENT_FUNCTION: |
| 525 | /* Fallthrough */ |
| 526 | case LTTNG_EVENT_PROBE: |
| 527 | { |
| 528 | const struct lttng_buffer_view probe_attr_view = |
| 529 | lttng_buffer_view_from_view(view, offset, |
| 530 | event_comm->lttng_event_probe_attr_len); |
| 531 | |
| 532 | if (event_comm->lttng_event_probe_attr_len == 0) { |
| 533 | ret = -1; |
| 534 | goto end; |
| 535 | } |
| 536 | |
| 537 | if (!lttng_buffer_view_is_valid(&probe_attr_view)) { |
| 538 | ret = -1; |
| 539 | goto end; |
| 540 | } |
| 541 | |
| 542 | ret = lttng_event_probe_attr_create_from_buffer( |
| 543 | &probe_attr_view, &local_probe_attr); |
| 544 | if (ret < 0 || ret != event_comm->lttng_event_probe_attr_len) { |
| 545 | ret = -1; |
| 546 | goto end; |
| 547 | } |
| 548 | |
| 549 | /* Copy to the local event. */ |
| 550 | memcpy(&local_event->attr.probe, local_probe_attr, |
| 551 | sizeof(local_event->attr.probe)); |
| 552 | |
| 553 | offset += ret; |
| 554 | break; |
| 555 | } |
| 556 | case LTTNG_EVENT_FUNCTION_ENTRY: |
| 557 | { |
| 558 | const struct lttng_buffer_view function_attr_view = |
| 559 | lttng_buffer_view_from_view(view, offset, |
| 560 | event_comm->lttng_event_function_attr_len); |
| 561 | |
| 562 | if (event_comm->lttng_event_function_attr_len == 0) { |
| 563 | ret = -1; |
| 564 | goto end; |
| 565 | } |
| 566 | |
| 567 | if (!lttng_buffer_view_is_valid(&function_attr_view)) { |
| 568 | ret = -1; |
| 569 | goto end; |
| 570 | } |
| 571 | |
| 572 | ret = lttng_event_function_attr_create_from_buffer( |
| 573 | &function_attr_view, &local_function_attr); |
| 574 | if (ret < 0 || ret != event_comm->lttng_event_function_attr_len) { |
| 575 | ret = -1; |
| 576 | goto end; |
| 577 | } |
| 578 | |
| 579 | /* Copy to the local event. */ |
| 580 | memcpy(&local_event->attr.ftrace, local_function_attr, |
| 581 | sizeof(local_event->attr.ftrace)); |
| 582 | |
| 583 | offset += ret; |
| 584 | |
| 585 | break; |
| 586 | } |
| 587 | case LTTNG_EVENT_USERSPACE_PROBE: |
| 588 | { |
| 589 | const struct lttng_buffer_view userspace_probe_location_view = |
| 590 | lttng_buffer_view_from_view(view, offset, |
| 591 | event_comm->userspace_probe_location_len); |
| 592 | const struct lttng_userspace_probe_location_lookup_method |
| 593 | *lookup = NULL; |
| 594 | |
| 595 | if (event_comm->userspace_probe_location_len == 0) { |
| 596 | ret = -1; |
| 597 | goto end; |
| 598 | } |
| 599 | |
| 600 | if (!lttng_buffer_view_is_valid( |
| 601 | &userspace_probe_location_view)) { |
| 602 | ret = -1; |
| 603 | goto end; |
| 604 | } |
| 605 | |
| 606 | ret = lttng_userspace_probe_location_create_from_buffer( |
| 607 | &userspace_probe_location_view, |
| 608 | &local_userspace_probe_location); |
| 609 | if (ret < 0) { |
| 610 | WARN("Failed to create a userspace probe location from the received buffer"); |
| 611 | ret = -1; |
| 612 | goto end; |
| 613 | } |
| 614 | |
| 615 | if (ret != event_comm->userspace_probe_location_len) { |
| 616 | 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); |
| 617 | ret = -1; |
| 618 | goto end; |
| 619 | } |
| 620 | |
| 621 | if (sock < 0) { |
| 622 | /* |
| 623 | * The userspace FD is simply not sent and we do not |
| 624 | * care about it. This happens on listing. |
| 625 | */ |
| 626 | goto attach_userspace_probe_to_event; |
| 627 | } |
| 628 | |
| 629 | /* |
| 630 | * Receive the file descriptor to the target binary from the |
| 631 | * client. |
| 632 | */ |
| 633 | DBG("Receiving userspace probe target FD from client ..."); |
| 634 | ret = lttcomm_recv_fds_unix_sock(sock, &received_fd, 1); |
| 635 | if (ret <= 0) { |
| 636 | DBG("Nothing recv() from client userspace probe fd... continuing"); |
| 637 | ret = -1; |
| 638 | goto end; |
| 639 | } |
| 640 | /* |
| 641 | * Set the file descriptor received from the client through the |
| 642 | * unix socket in the probe location. |
| 643 | */ |
| 644 | lookup = lttng_userspace_probe_location_get_lookup_method( |
| 645 | local_userspace_probe_location); |
| 646 | if (!lookup) { |
| 647 | ret = LTTNG_ERR_PROBE_LOCATION_INVAL; |
| 648 | goto end; |
| 649 | } |
| 650 | |
| 651 | /* |
| 652 | * From the kernel tracer's perspective, all userspace probe |
| 653 | * event types are all the same: a file and an offset. |
| 654 | */ |
| 655 | switch (lttng_userspace_probe_location_lookup_method_get_type( |
| 656 | lookup)) { |
| 657 | case LTTNG_USERSPACE_PROBE_LOCATION_LOOKUP_METHOD_TYPE_FUNCTION_ELF: |
| 658 | ret = lttng_userspace_probe_location_function_set_binary_fd( |
| 659 | local_userspace_probe_location, |
| 660 | received_fd); |
| 661 | break; |
| 662 | case LTTNG_USERSPACE_PROBE_LOCATION_LOOKUP_METHOD_TYPE_TRACEPOINT_SDT: |
| 663 | ret = lttng_userspace_probe_location_tracepoint_set_binary_fd( |
| 664 | local_userspace_probe_location, |
| 665 | received_fd); |
| 666 | break; |
| 667 | default: |
| 668 | ret = LTTNG_ERR_PROBE_LOCATION_INVAL; |
| 669 | goto end; |
| 670 | } |
| 671 | |
| 672 | if (ret) { |
| 673 | ret = LTTNG_ERR_PROBE_LOCATION_INVAL; |
| 674 | goto end; |
| 675 | } |
| 676 | |
| 677 | /* Fd transfered to the object. */ |
| 678 | received_fd = -1; |
| 679 | |
| 680 | attach_userspace_probe_to_event: |
| 681 | |
| 682 | /* Attach the probe location to the event. */ |
| 683 | ret = lttng_event_set_userspace_probe_location( |
| 684 | local_event, local_userspace_probe_location); |
| 685 | if (ret) { |
| 686 | ret = LTTNG_ERR_PROBE_LOCATION_INVAL; |
| 687 | goto end; |
| 688 | } |
| 689 | |
| 690 | /* |
| 691 | * Userspace probe location object ownership transfered to the |
| 692 | * event object |
| 693 | */ |
| 694 | local_userspace_probe_location = NULL; |
| 695 | offset += event_comm->userspace_probe_location_len; |
| 696 | break; |
| 697 | } |
| 698 | case LTTNG_EVENT_TRACEPOINT: |
| 699 | /* Fallthrough */ |
| 700 | case LTTNG_EVENT_ALL: |
| 701 | /* Fallthrough */ |
| 702 | case LTTNG_EVENT_SYSCALL: |
| 703 | /* Fallthrough */ |
| 704 | case LTTNG_EVENT_NOOP: |
| 705 | /* Nothing to do here */ |
| 706 | break; |
| 707 | default: |
| 708 | ret = LTTNG_ERR_UND; |
| 709 | goto end; |
| 710 | break; |
| 711 | } |
| 712 | |
| 713 | /* Transfer ownership to the caller. */ |
| 714 | *event = local_event; |
| 715 | local_event = NULL; |
| 716 | |
| 717 | if (bytecode) { |
| 718 | *bytecode = local_bytecode; |
| 719 | local_bytecode = NULL; |
| 720 | } |
| 721 | |
| 722 | if (exclusion) { |
| 723 | *exclusion = local_exclusions; |
| 724 | local_exclusions = NULL; |
| 725 | } |
| 726 | |
| 727 | if (filter_expression) { |
| 728 | *filter_expression = local_filter_expression; |
| 729 | local_filter_expression = NULL; |
| 730 | } |
| 731 | |
| 732 | ret = offset; |
| 733 | end: |
| 734 | lttng_event_destroy(local_event); |
| 735 | lttng_userspace_probe_location_destroy(local_userspace_probe_location); |
| 736 | free(local_filter_expression); |
| 737 | free(local_exclusions); |
| 738 | free(local_bytecode); |
| 739 | free(local_function_attr); |
| 740 | free(local_probe_attr); |
| 741 | if (received_fd > -1) { |
| 742 | if (close(received_fd)) { |
| 743 | PERROR("Failed to close received fd"); |
| 744 | }; |
| 745 | } |
| 746 | return ret; |
| 747 | } |
| 748 | |
| 749 | LTTNG_HIDDEN |
| 750 | int lttng_event_serialize(const struct lttng_event *event, |
| 751 | unsigned int exclusion_count, |
| 752 | char **exclusion_list, |
| 753 | char *filter_expression, |
| 754 | size_t bytecode_len, |
| 755 | void *bytecode, |
| 756 | struct lttng_dynamic_buffer *buf, |
| 757 | int *fd_to_send) |
| 758 | { |
| 759 | int ret; |
| 760 | unsigned int i; |
| 761 | size_t header_offset, size_before_payload; |
| 762 | size_t name_len; |
| 763 | struct lttng_event_comm event_comm = { 0 }; |
| 764 | struct lttng_event_comm *header; |
| 765 | |
| 766 | assert(event); |
| 767 | assert(buf); |
| 768 | |
| 769 | /* Save the header location for later in-place header update. */ |
| 770 | header_offset = buf->size; |
| 771 | |
| 772 | name_len = lttng_strnlen(event->name, LTTNG_SYMBOL_NAME_LEN); |
| 773 | if (name_len == LTTNG_SYMBOL_NAME_LEN) { |
| 774 | /* Event name is not NULL-terminated. */ |
| 775 | ret = -1; |
| 776 | goto end; |
| 777 | } |
| 778 | |
| 779 | /* Add null termination. */ |
| 780 | name_len += 1; |
| 781 | |
| 782 | if (exclusion_count > UINT32_MAX) { |
| 783 | /* Possible overflow. */ |
| 784 | ret = -1; |
| 785 | goto end; |
| 786 | } |
| 787 | |
| 788 | if (bytecode_len > UINT32_MAX) { |
| 789 | /* Possible overflow. */ |
| 790 | ret = -1; |
| 791 | goto end; |
| 792 | } |
| 793 | |
| 794 | event_comm.name_len = (uint32_t) name_len; |
| 795 | event_comm.event_type = (int8_t) event->type; |
| 796 | event_comm.loglevel_type = (int8_t) event->loglevel_type; |
| 797 | event_comm.loglevel = (int32_t) event->loglevel; |
| 798 | event_comm.enabled = (int8_t) event->enabled; |
| 799 | event_comm.pid = (int32_t) event->pid; |
| 800 | event_comm.exclusion_count = (uint32_t) exclusion_count; |
| 801 | event_comm.bytecode_len = (uint32_t) bytecode_len; |
| 802 | event_comm.flags = (int32_t) event->flags; |
| 803 | |
| 804 | if (filter_expression) { |
| 805 | event_comm.filter_expression_len = |
| 806 | strlen(filter_expression) + 1; |
| 807 | } |
| 808 | |
| 809 | /* Header */ |
| 810 | ret = lttng_dynamic_buffer_append(buf, &event_comm, sizeof(event_comm)); |
| 811 | if (ret) { |
| 812 | goto end; |
| 813 | } |
| 814 | |
| 815 | /* Event name */ |
| 816 | ret = lttng_dynamic_buffer_append(buf, event->name, name_len); |
| 817 | if (ret) { |
| 818 | goto end; |
| 819 | } |
| 820 | |
| 821 | /* Exclusions */ |
| 822 | for (i = 0; i < exclusion_count; i++) { |
| 823 | size_t exclusion_len; |
| 824 | struct lttng_event_exclusion_comm exclusion_comm = { 0 }; |
| 825 | |
| 826 | assert(exclusion_list); |
| 827 | |
| 828 | exclusion_len = lttng_strnlen( |
| 829 | *(exclusion_list + i), LTTNG_SYMBOL_NAME_LEN); |
| 830 | if (exclusion_len == LTTNG_SYMBOL_NAME_LEN) { |
| 831 | /* Exclusion is not NULL-terminated. */ |
| 832 | ret = -1; |
| 833 | goto end; |
| 834 | } |
| 835 | |
| 836 | /* Include null terminator '\0'. */ |
| 837 | exclusion_len += 1; |
| 838 | |
| 839 | exclusion_comm.len = exclusion_len; |
| 840 | |
| 841 | ret = lttng_dynamic_buffer_append(buf, &exclusion_comm, sizeof(exclusion_comm)); |
| 842 | if (ret) { |
| 843 | goto end; |
| 844 | } |
| 845 | |
| 846 | ret = lttng_dynamic_buffer_append(buf, *(exclusion_list + i), |
| 847 | exclusion_len); |
| 848 | if (ret) { |
| 849 | goto end; |
| 850 | } |
| 851 | } |
| 852 | |
| 853 | /* Filter expression and its bytecode */ |
| 854 | if (filter_expression) { |
| 855 | ret = lttng_dynamic_buffer_append(buf, filter_expression, |
| 856 | event_comm.filter_expression_len); |
| 857 | if (ret) { |
| 858 | goto end; |
| 859 | } |
| 860 | |
| 861 | /* |
| 862 | * Bytecode can be absent when we serialize to the client |
| 863 | * for listing. |
| 864 | */ |
| 865 | if (bytecode) { |
| 866 | ret = lttng_dynamic_buffer_append( |
| 867 | buf, bytecode, bytecode_len); |
| 868 | if (ret) { |
| 869 | goto end; |
| 870 | } |
| 871 | } |
| 872 | } |
| 873 | |
| 874 | size_before_payload = buf->size; |
| 875 | |
| 876 | /* Event type specific payload */ |
| 877 | switch (event->type) { |
| 878 | case LTTNG_EVENT_FUNCTION: |
| 879 | /* Fallthrough */ |
| 880 | case LTTNG_EVENT_PROBE: |
| 881 | ret = lttng_event_probe_attr_serialize(&event->attr.probe, buf); |
| 882 | if (ret) { |
| 883 | ret = -1; |
| 884 | goto end; |
| 885 | } |
| 886 | |
| 887 | header = (struct lttng_event_comm *) ((char *) buf->data + |
| 888 | header_offset); |
| 889 | header->lttng_event_probe_attr_len = |
| 890 | buf->size - size_before_payload; |
| 891 | |
| 892 | break; |
| 893 | case LTTNG_EVENT_FUNCTION_ENTRY: |
| 894 | ret = lttng_event_function_attr_serialize( |
| 895 | &event->attr.ftrace, buf); |
| 896 | if (ret) { |
| 897 | ret = -1; |
| 898 | goto end; |
| 899 | } |
| 900 | |
| 901 | /* Update the lttng_event_function_attr len. */ |
| 902 | header = (struct lttng_event_comm *) ((char *) buf->data + |
| 903 | header_offset); |
| 904 | header->lttng_event_function_attr_len = |
| 905 | buf->size - size_before_payload; |
| 906 | |
| 907 | break; |
| 908 | case LTTNG_EVENT_USERSPACE_PROBE: |
| 909 | { |
| 910 | struct lttng_event_extended *ev_ext = |
| 911 | (struct lttng_event_extended *) |
| 912 | event->extended.ptr; |
| 913 | assert(event->extended.ptr); |
| 914 | assert(ev_ext->probe_location); |
| 915 | |
| 916 | size_before_payload = buf->size; |
| 917 | if (ev_ext->probe_location) { |
| 918 | /* |
| 919 | * lttng_userspace_probe_location_serialize returns the |
| 920 | * number of bytes that were appended to the buffer. |
| 921 | */ |
| 922 | ret = lttng_userspace_probe_location_serialize( |
| 923 | ev_ext->probe_location, buf, |
| 924 | fd_to_send); |
| 925 | if (ret < 0) { |
| 926 | goto end; |
| 927 | } |
| 928 | ret = 0; |
| 929 | |
| 930 | /* Update the userspace probe location len. */ |
| 931 | header = (struct lttng_event_comm *) ((char *) buf->data + |
| 932 | header_offset); |
| 933 | header->userspace_probe_location_len = |
| 934 | buf->size - size_before_payload; |
| 935 | } |
| 936 | break; |
| 937 | } |
| 938 | case LTTNG_EVENT_TRACEPOINT: |
| 939 | /* Fallthrough */ |
| 940 | case LTTNG_EVENT_ALL: |
| 941 | /* Fallthrough */ |
| 942 | default: |
| 943 | /* Nothing to do here */ |
| 944 | break; |
| 945 | } |
| 946 | |
| 947 | end: |
| 948 | return ret; |
| 949 | } |
| 950 | |
| 951 | static ssize_t lttng_event_context_app_populate_from_buffer( |
| 952 | const struct lttng_buffer_view *view, |
| 953 | struct lttng_event_context *event_ctx) |
| 954 | { |
| 955 | ssize_t ret, offset = 0; |
| 956 | const struct lttng_event_context_app_comm *comm; |
| 957 | char *provider_name = NULL, *context_name = NULL; |
| 958 | size_t provider_name_len, context_name_len; |
| 959 | const struct lttng_buffer_view comm_view = lttng_buffer_view_from_view( |
| 960 | view, offset, sizeof(*comm)); |
| 961 | |
| 962 | assert(event_ctx->ctx == LTTNG_EVENT_CONTEXT_APP_CONTEXT); |
| 963 | |
| 964 | if (!lttng_buffer_view_is_valid(&comm_view)) { |
| 965 | ret = -1; |
| 966 | goto end; |
| 967 | } |
| 968 | |
| 969 | comm = (typeof(comm)) comm_view.data; |
| 970 | offset += sizeof(*comm); |
| 971 | |
| 972 | provider_name_len = comm->provider_name_len; |
| 973 | context_name_len = comm->ctx_name_len; |
| 974 | |
| 975 | if (provider_name_len == 0 || context_name_len == 0) { |
| 976 | /* |
| 977 | * Application provider and context names MUST |
| 978 | * be provided. |
| 979 | */ |
| 980 | ret = -1; |
| 981 | goto end; |
| 982 | } |
| 983 | |
| 984 | { |
| 985 | const char *name; |
| 986 | const struct lttng_buffer_view provider_name_view = |
| 987 | lttng_buffer_view_from_view(view, offset, |
| 988 | provider_name_len); |
| 989 | |
| 990 | if (!lttng_buffer_view_is_valid(&provider_name_view)) { |
| 991 | ret = -1; |
| 992 | goto end; |
| 993 | } |
| 994 | |
| 995 | name = provider_name_view.data; |
| 996 | |
| 997 | if (!lttng_buffer_view_contains_string(&provider_name_view, |
| 998 | name, provider_name_len)) { |
| 999 | ret = -1; |
| 1000 | goto end; |
| 1001 | } |
| 1002 | |
| 1003 | provider_name = lttng_strndup(name, provider_name_len); |
| 1004 | if (!provider_name) { |
| 1005 | ret = -1; |
| 1006 | goto end; |
| 1007 | } |
| 1008 | offset += provider_name_len; |
| 1009 | } |
| 1010 | |
| 1011 | { |
| 1012 | const char *name; |
| 1013 | const struct lttng_buffer_view context_name_view = |
| 1014 | lttng_buffer_view_from_view( |
| 1015 | view, offset, context_name_len); |
| 1016 | |
| 1017 | if (!lttng_buffer_view_is_valid(&context_name_view)) { |
| 1018 | ret = -1; |
| 1019 | goto end; |
| 1020 | } |
| 1021 | |
| 1022 | name = context_name_view.data; |
| 1023 | |
| 1024 | if (!lttng_buffer_view_contains_string(&context_name_view, name, |
| 1025 | context_name_len)) { |
| 1026 | ret = -1; |
| 1027 | goto end; |
| 1028 | } |
| 1029 | |
| 1030 | context_name = lttng_strndup(name, context_name_len); |
| 1031 | if (!context_name) { |
| 1032 | ret = -1; |
| 1033 | goto end; |
| 1034 | } |
| 1035 | |
| 1036 | offset += context_name_len; |
| 1037 | } |
| 1038 | |
| 1039 | /* Transfer ownership of the strings */ |
| 1040 | event_ctx->u.app_ctx.provider_name = provider_name; |
| 1041 | event_ctx->u.app_ctx.ctx_name = context_name; |
| 1042 | provider_name = NULL; |
| 1043 | context_name = NULL; |
| 1044 | |
| 1045 | ret = offset; |
| 1046 | end: |
| 1047 | free(provider_name); |
| 1048 | free(context_name); |
| 1049 | |
| 1050 | return ret; |
| 1051 | } |
| 1052 | |
| 1053 | static ssize_t lttng_event_context_perf_counter_populate_from_buffer( |
| 1054 | const struct lttng_buffer_view *view, |
| 1055 | struct lttng_event_context *event_ctx) |
| 1056 | { |
| 1057 | int ret; |
| 1058 | ssize_t consumed, offset = 0; |
| 1059 | const struct lttng_event_context_perf_counter_comm *comm; |
| 1060 | size_t name_len; |
| 1061 | const struct lttng_buffer_view comm_view = lttng_buffer_view_from_view( |
| 1062 | view, offset, sizeof(*comm)); |
| 1063 | |
| 1064 | assert(event_ctx->ctx == LTTNG_EVENT_CONTEXT_PERF_COUNTER || |
| 1065 | event_ctx->ctx == |
| 1066 | LTTNG_EVENT_CONTEXT_PERF_THREAD_COUNTER || |
| 1067 | event_ctx->ctx == LTTNG_EVENT_CONTEXT_PERF_CPU_COUNTER); |
| 1068 | |
| 1069 | if (!lttng_buffer_view_is_valid(&comm_view)) { |
| 1070 | consumed = -1; |
| 1071 | goto end; |
| 1072 | } |
| 1073 | |
| 1074 | comm = (typeof(comm)) comm_view.data; |
| 1075 | offset += sizeof(*comm); |
| 1076 | |
| 1077 | name_len = comm->name_len; |
| 1078 | { |
| 1079 | const char *name; |
| 1080 | const struct lttng_buffer_view provider_name_view = |
| 1081 | lttng_buffer_view_from_view( |
| 1082 | view, offset, name_len); |
| 1083 | if (!lttng_buffer_view_is_valid(&provider_name_view)) { |
| 1084 | consumed = -1; |
| 1085 | goto end; |
| 1086 | } |
| 1087 | |
| 1088 | name = provider_name_view.data; |
| 1089 | |
| 1090 | if (!lttng_buffer_view_contains_string( |
| 1091 | &provider_name_view, name, name_len)) { |
| 1092 | consumed = -1; |
| 1093 | goto end; |
| 1094 | } |
| 1095 | |
| 1096 | ret = lttng_strncpy(event_ctx->u.perf_counter.name, name, name_len); |
| 1097 | if (ret) { |
| 1098 | consumed = -1; |
| 1099 | goto end; |
| 1100 | } |
| 1101 | offset += name_len; |
| 1102 | } |
| 1103 | |
| 1104 | event_ctx->u.perf_counter.config = comm->config; |
| 1105 | event_ctx->u.perf_counter.type = comm->type; |
| 1106 | |
| 1107 | consumed = offset; |
| 1108 | |
| 1109 | end: |
| 1110 | return consumed; |
| 1111 | } |
| 1112 | |
| 1113 | LTTNG_HIDDEN |
| 1114 | ssize_t lttng_event_context_create_from_buffer( |
| 1115 | const struct lttng_buffer_view *view, |
| 1116 | struct lttng_event_context **event_ctx) |
| 1117 | { |
| 1118 | ssize_t ret, offset = 0; |
| 1119 | const struct lttng_event_context_comm *comm; |
| 1120 | struct lttng_event_context *local_context = NULL; |
| 1121 | struct lttng_buffer_view subtype_view; |
| 1122 | struct lttng_buffer_view comm_view = lttng_buffer_view_from_view( |
| 1123 | view, offset, sizeof(*comm)); |
| 1124 | |
| 1125 | assert(event_ctx); |
| 1126 | assert(view); |
| 1127 | |
| 1128 | if (!lttng_buffer_view_is_valid(&comm_view)) { |
| 1129 | ret = -1; |
| 1130 | goto end; |
| 1131 | } |
| 1132 | |
| 1133 | comm = (typeof(comm)) comm_view.data; |
| 1134 | offset += sizeof(*comm); |
| 1135 | |
| 1136 | local_context = zmalloc(sizeof(*local_context)); |
| 1137 | if (!local_context) { |
| 1138 | ret = -1; |
| 1139 | goto end; |
| 1140 | } |
| 1141 | |
| 1142 | local_context->ctx = comm->type; |
| 1143 | |
| 1144 | subtype_view = lttng_buffer_view_from_view(view, offset, -1); |
| 1145 | |
| 1146 | switch (local_context->ctx) { |
| 1147 | case LTTNG_EVENT_CONTEXT_APP_CONTEXT: |
| 1148 | ret = lttng_event_context_app_populate_from_buffer( |
| 1149 | &subtype_view, local_context); |
| 1150 | break; |
| 1151 | case LTTNG_EVENT_CONTEXT_PERF_COUNTER: |
| 1152 | case LTTNG_EVENT_CONTEXT_PERF_THREAD_COUNTER: |
| 1153 | case LTTNG_EVENT_CONTEXT_PERF_CPU_COUNTER: |
| 1154 | ret = lttng_event_context_perf_counter_populate_from_buffer( |
| 1155 | &subtype_view, local_context); |
| 1156 | break; |
| 1157 | default: |
| 1158 | /* Nothing else to deserialize. */ |
| 1159 | ret = 0; |
| 1160 | break; |
| 1161 | } |
| 1162 | |
| 1163 | if (ret < 0) { |
| 1164 | goto end; |
| 1165 | } |
| 1166 | |
| 1167 | offset += ret; |
| 1168 | |
| 1169 | *event_ctx = local_context; |
| 1170 | local_context = NULL; |
| 1171 | ret = offset; |
| 1172 | |
| 1173 | end: |
| 1174 | free(local_context); |
| 1175 | return ret; |
| 1176 | } |
| 1177 | |
| 1178 | static int lttng_event_context_app_serialize( |
| 1179 | struct lttng_event_context *context, |
| 1180 | struct lttng_dynamic_buffer *buffer) |
| 1181 | { |
| 1182 | int ret; |
| 1183 | struct lttng_event_context_app_comm comm = { 0 }; |
| 1184 | size_t provider_len, ctx_len; |
| 1185 | const char *provider_name; |
| 1186 | const char *ctx_name; |
| 1187 | |
| 1188 | assert(buffer); |
| 1189 | assert(context); |
| 1190 | assert(context->ctx == LTTNG_EVENT_CONTEXT_APP_CONTEXT); |
| 1191 | |
| 1192 | provider_name = context->u.app_ctx.provider_name; |
| 1193 | ctx_name = context->u.app_ctx.ctx_name; |
| 1194 | |
| 1195 | if (!provider_name || !ctx_name) { |
| 1196 | ret = -LTTNG_ERR_INVALID; |
| 1197 | goto end; |
| 1198 | } |
| 1199 | |
| 1200 | provider_len = strlen(provider_name); |
| 1201 | if (provider_len == 0) { |
| 1202 | ret = -LTTNG_ERR_INVALID; |
| 1203 | goto end; |
| 1204 | } |
| 1205 | |
| 1206 | /* Include the null terminator. */ |
| 1207 | provider_len += 1; |
| 1208 | comm.provider_name_len = provider_len; |
| 1209 | |
| 1210 | ctx_len = strlen(ctx_name); |
| 1211 | if (ctx_len == 0) { |
| 1212 | ret = -LTTNG_ERR_INVALID; |
| 1213 | goto end; |
| 1214 | } |
| 1215 | |
| 1216 | /* Include the null terminator. */ |
| 1217 | ctx_len += 1; |
| 1218 | comm.ctx_name_len = ctx_len; |
| 1219 | |
| 1220 | /* Header */ |
| 1221 | ret = lttng_dynamic_buffer_append(buffer, &comm, sizeof(comm)); |
| 1222 | if (ret) { |
| 1223 | ret = -1; |
| 1224 | goto end; |
| 1225 | } |
| 1226 | |
| 1227 | ret = lttng_dynamic_buffer_append(buffer, provider_name, provider_len); |
| 1228 | if (ret) { |
| 1229 | ret = -1; |
| 1230 | goto end; |
| 1231 | } |
| 1232 | ret = lttng_dynamic_buffer_append(buffer, ctx_name, ctx_len); |
| 1233 | if (ret) { |
| 1234 | ret = -1; |
| 1235 | goto end; |
| 1236 | } |
| 1237 | |
| 1238 | end: |
| 1239 | return ret; |
| 1240 | } |
| 1241 | |
| 1242 | static int lttng_event_context_perf_counter_serialize( |
| 1243 | struct lttng_event_perf_counter_ctx *context, |
| 1244 | struct lttng_dynamic_buffer *buffer) |
| 1245 | { |
| 1246 | int ret; |
| 1247 | struct lttng_event_context_perf_counter_comm comm = { 0 }; |
| 1248 | |
| 1249 | assert(buffer); |
| 1250 | assert(context); |
| 1251 | |
| 1252 | comm.config = context->config; |
| 1253 | comm.type = context->type; |
| 1254 | comm.name_len = lttng_strnlen(context->name, LTTNG_SYMBOL_NAME_LEN); |
| 1255 | |
| 1256 | if (comm.name_len == LTTNG_SYMBOL_NAME_LEN) { |
| 1257 | ret = -1; |
| 1258 | goto end; |
| 1259 | } |
| 1260 | |
| 1261 | /* Include the null terminator. */ |
| 1262 | comm.name_len += 1; |
| 1263 | |
| 1264 | /* Header */ |
| 1265 | ret = lttng_dynamic_buffer_append(buffer, &comm, sizeof(comm)); |
| 1266 | if (ret) { |
| 1267 | ret = -1; |
| 1268 | goto end; |
| 1269 | } |
| 1270 | |
| 1271 | ret = lttng_dynamic_buffer_append(buffer, context->name, comm.name_len); |
| 1272 | if (ret) { |
| 1273 | ret = -1; |
| 1274 | goto end; |
| 1275 | } |
| 1276 | |
| 1277 | end: |
| 1278 | return ret; |
| 1279 | } |
| 1280 | |
| 1281 | LTTNG_HIDDEN |
| 1282 | int lttng_event_context_serialize(struct lttng_event_context *context, |
| 1283 | struct lttng_dynamic_buffer *buf) |
| 1284 | { |
| 1285 | int ret; |
| 1286 | struct lttng_event_context_comm context_comm = { 0 }; |
| 1287 | |
| 1288 | assert(context); |
| 1289 | assert(buf); |
| 1290 | |
| 1291 | context_comm.type = (uint32_t) context->ctx; |
| 1292 | |
| 1293 | /* Header */ |
| 1294 | ret = lttng_dynamic_buffer_append( |
| 1295 | buf, &context_comm, sizeof(context_comm)); |
| 1296 | if (ret) { |
| 1297 | goto end; |
| 1298 | } |
| 1299 | |
| 1300 | switch (context->ctx) { |
| 1301 | case LTTNG_EVENT_CONTEXT_APP_CONTEXT: |
| 1302 | ret = lttng_event_context_app_serialize(context, buf); |
| 1303 | break; |
| 1304 | case LTTNG_EVENT_CONTEXT_PERF_COUNTER: |
| 1305 | case LTTNG_EVENT_CONTEXT_PERF_THREAD_COUNTER: |
| 1306 | case LTTNG_EVENT_CONTEXT_PERF_CPU_COUNTER: |
| 1307 | ret = lttng_event_context_perf_counter_serialize( |
| 1308 | &context->u.perf_counter, buf); |
| 1309 | break; |
| 1310 | default: |
| 1311 | /* Nothing else to serialize. */ |
| 1312 | break; |
| 1313 | } |
| 1314 | |
| 1315 | if (ret) { |
| 1316 | goto end; |
| 1317 | } |
| 1318 | |
| 1319 | end: |
| 1320 | return ret; |
| 1321 | } |
| 1322 | |
| 1323 | LTTNG_HIDDEN |
| 1324 | void lttng_event_context_destroy(struct lttng_event_context *context) |
| 1325 | { |
| 1326 | if (!context) { |
| 1327 | return; |
| 1328 | } |
| 1329 | |
| 1330 | if (context->ctx == LTTNG_EVENT_CONTEXT_APP_CONTEXT) { |
| 1331 | free(context->u.app_ctx.provider_name); |
| 1332 | free(context->u.app_ctx.ctx_name); |
| 1333 | } |
| 1334 | |
| 1335 | free(context); |
| 1336 | } |
| 1337 | |
| 1338 | /* |
| 1339 | * This is a specialized populate for lttng_event_field since it ignores |
| 1340 | * the extension field of the lttng_event struct and simply copies what it can |
| 1341 | * to the internal struct lttng_event of a lttng_event_field. |
| 1342 | */ |
| 1343 | static void lttng_event_field_populate_lttng_event_from_event( |
| 1344 | const struct lttng_event *src, struct lttng_event *destination) |
| 1345 | { |
| 1346 | memcpy(destination, src, sizeof(*destination)); |
| 1347 | |
| 1348 | /* Remove all possible dynamic data from the destination event rule. */ |
| 1349 | destination->extended.ptr = NULL; |
| 1350 | } |
| 1351 | |
| 1352 | LTTNG_HIDDEN |
| 1353 | ssize_t lttng_event_field_create_from_buffer( |
| 1354 | const struct lttng_buffer_view *view, |
| 1355 | struct lttng_event_field **field) |
| 1356 | { |
| 1357 | ssize_t ret, offset = 0; |
| 1358 | struct lttng_event_field *local_event_field = NULL; |
| 1359 | struct lttng_event *event = NULL; |
| 1360 | const struct lttng_event_field_comm *comm; |
| 1361 | const char* name = NULL; |
| 1362 | |
| 1363 | assert(field); |
| 1364 | assert(view); |
| 1365 | |
| 1366 | { |
| 1367 | const struct lttng_buffer_view comm_view = |
| 1368 | lttng_buffer_view_from_view( |
| 1369 | view, offset, sizeof(*comm)); |
| 1370 | |
| 1371 | if (!lttng_buffer_view_is_valid(&comm_view)) { |
| 1372 | ret = -1; |
| 1373 | goto end; |
| 1374 | } |
| 1375 | /* lttng_event_field_comm header */ |
| 1376 | comm = (const struct lttng_event_field_comm *) view->data; |
| 1377 | offset += sizeof(*comm); |
| 1378 | } |
| 1379 | |
| 1380 | local_event_field = zmalloc(sizeof(*local_event_field)); |
| 1381 | if (!local_event_field) { |
| 1382 | ret = -1; |
| 1383 | goto end; |
| 1384 | } |
| 1385 | |
| 1386 | local_event_field->type = comm->type; |
| 1387 | local_event_field->nowrite = comm->nowrite; |
| 1388 | |
| 1389 | /* Field name */ |
| 1390 | { |
| 1391 | const struct lttng_buffer_view name_view = |
| 1392 | lttng_buffer_view_from_view( |
| 1393 | view, offset, comm->name_len); |
| 1394 | |
| 1395 | if (!lttng_buffer_view_is_valid(&name_view)) { |
| 1396 | ret = -1; |
| 1397 | goto end; |
| 1398 | } |
| 1399 | |
| 1400 | name = name_view.data; |
| 1401 | |
| 1402 | if (!lttng_buffer_view_contains_string(&name_view, name_view.data, comm->name_len)) { |
| 1403 | ret = -1; |
| 1404 | goto end; |
| 1405 | } |
| 1406 | |
| 1407 | if (comm->name_len > LTTNG_SYMBOL_NAME_LEN - 1) { |
| 1408 | /* Name is too long.*/ |
| 1409 | ret = -1; |
| 1410 | goto end; |
| 1411 | } |
| 1412 | offset += comm->name_len; |
| 1413 | } |
| 1414 | |
| 1415 | /* Event */ |
| 1416 | { |
| 1417 | const struct lttng_buffer_view event_view = |
| 1418 | lttng_buffer_view_from_view( |
| 1419 | view, offset, comm->event_len); |
| 1420 | |
| 1421 | if (!lttng_buffer_view_is_valid(&event_view)) { |
| 1422 | ret = -1; |
| 1423 | goto end; |
| 1424 | } |
| 1425 | ret = lttng_event_create_from_buffer(&event_view, &event, NULL, |
| 1426 | NULL, NULL, -1); |
| 1427 | if (ret != comm->event_len) { |
| 1428 | abort(); |
| 1429 | } |
| 1430 | offset += ret; |
| 1431 | } |
| 1432 | |
| 1433 | assert(name); |
| 1434 | assert(event); |
| 1435 | |
| 1436 | if (lttng_strncpy(local_event_field->field_name, name , LTTNG_SYMBOL_NAME_LEN)) { |
| 1437 | ret = -1; |
| 1438 | goto end; |
| 1439 | } |
| 1440 | |
| 1441 | lttng_event_field_populate_lttng_event_from_event( |
| 1442 | event, &local_event_field->event); |
| 1443 | |
| 1444 | *field = local_event_field; |
| 1445 | local_event_field = NULL; |
| 1446 | ret = offset; |
| 1447 | end: |
| 1448 | lttng_event_destroy(event); |
| 1449 | free(local_event_field); |
| 1450 | return ret; |
| 1451 | } |
| 1452 | |
| 1453 | LTTNG_HIDDEN |
| 1454 | int lttng_event_field_serialize(const struct lttng_event_field *field, |
| 1455 | struct lttng_dynamic_buffer *buffer) |
| 1456 | { |
| 1457 | int ret; |
| 1458 | size_t header_offset, size_before_event; |
| 1459 | size_t name_len; |
| 1460 | struct lttng_event_field_comm event_field_comm = { 0 }; |
| 1461 | struct lttng_event_field_comm *header; |
| 1462 | |
| 1463 | assert(field); |
| 1464 | assert(buffer); |
| 1465 | |
| 1466 | /* Save the header location for later in-place header update. */ |
| 1467 | header_offset = buffer->size; |
| 1468 | |
| 1469 | name_len = strnlen(field->field_name, LTTNG_SYMBOL_NAME_LEN); |
| 1470 | if (name_len == LTTNG_SYMBOL_NAME_LEN) { |
| 1471 | /* Event name is not NULL-terminated. */ |
| 1472 | ret = -1; |
| 1473 | goto end; |
| 1474 | } |
| 1475 | |
| 1476 | /* Add null termination. */ |
| 1477 | name_len += 1; |
| 1478 | |
| 1479 | event_field_comm.type = field->type; |
| 1480 | event_field_comm.nowrite = (uint8_t)field->nowrite; |
| 1481 | event_field_comm.name_len = name_len; |
| 1482 | |
| 1483 | /* Header */ |
| 1484 | ret = lttng_dynamic_buffer_append( |
| 1485 | buffer, &event_field_comm, sizeof(event_field_comm)); |
| 1486 | if (ret) { |
| 1487 | goto end; |
| 1488 | } |
| 1489 | |
| 1490 | /* Field name */ |
| 1491 | ret = lttng_dynamic_buffer_append(buffer, field->field_name, name_len); |
| 1492 | if (ret) { |
| 1493 | goto end; |
| 1494 | } |
| 1495 | |
| 1496 | size_before_event = buffer->size; |
| 1497 | ret = lttng_event_serialize( |
| 1498 | &field->event, 0, NULL, NULL, 0, 0, buffer, NULL); |
| 1499 | if (ret) { |
| 1500 | ret = -1; |
| 1501 | goto end; |
| 1502 | } |
| 1503 | |
| 1504 | /* Update the event len. */ |
| 1505 | header = (struct lttng_event_field_comm *) ((char *) buffer->data + |
| 1506 | header_offset); |
| 1507 | header->event_len = buffer->size - size_before_event; |
| 1508 | |
| 1509 | end: |
| 1510 | return ret; |
| 1511 | } |
| 1512 | |
| 1513 | static enum lttng_error_code compute_flattened_size( |
| 1514 | struct lttng_dynamic_pointer_array *events, size_t *size) |
| 1515 | { |
| 1516 | enum lttng_error_code ret_code; |
| 1517 | int ret = 0; |
| 1518 | size_t storage_req, event_count, i; |
| 1519 | |
| 1520 | assert(size); |
| 1521 | assert(events); |
| 1522 | |
| 1523 | event_count = lttng_dynamic_pointer_array_get_count(events); |
| 1524 | |
| 1525 | /* The basic struct lttng_event */ |
| 1526 | storage_req = event_count * sizeof(struct lttng_event); |
| 1527 | |
| 1528 | /* The struct lttng_event_extended */ |
| 1529 | storage_req += event_count * sizeof(struct lttng_event_extended); |
| 1530 | |
| 1531 | for (i = 0; i < event_count; i++) { |
| 1532 | int probe_storage_req = 0; |
| 1533 | const struct event_list_element *element = |
| 1534 | lttng_dynamic_pointer_array_get_pointer( |
| 1535 | events, i); |
| 1536 | const struct lttng_userspace_probe_location *location = NULL; |
| 1537 | |
| 1538 | location = lttng_event_get_userspace_probe_location( |
| 1539 | element->event); |
| 1540 | if (location) { |
| 1541 | ret = lttng_userspace_probe_location_flatten( |
| 1542 | location, NULL); |
| 1543 | if (ret < 0) { |
| 1544 | ret_code = LTTNG_ERR_PROBE_LOCATION_INVAL; |
| 1545 | goto end; |
| 1546 | } |
| 1547 | |
| 1548 | probe_storage_req = ret; |
| 1549 | } |
| 1550 | |
| 1551 | if (element->filter_expression) { |
| 1552 | storage_req += strlen(element->filter_expression) + 1; |
| 1553 | } |
| 1554 | |
| 1555 | if (element->exclusions) { |
| 1556 | storage_req += element->exclusions->count * |
| 1557 | LTTNG_SYMBOL_NAME_LEN; |
| 1558 | } |
| 1559 | |
| 1560 | /* Padding to ensure the flat probe is aligned. */ |
| 1561 | storage_req = ALIGN_TO(storage_req, sizeof(uint64_t)); |
| 1562 | storage_req += probe_storage_req; |
| 1563 | } |
| 1564 | |
| 1565 | *size = storage_req; |
| 1566 | ret_code = LTTNG_OK; |
| 1567 | |
| 1568 | end: |
| 1569 | return ret_code; |
| 1570 | } |
| 1571 | |
| 1572 | /* |
| 1573 | * Flatten a list of struct lttng_event. |
| 1574 | * |
| 1575 | * The buffer that is returned to the API client must contain a "flat" version |
| 1576 | * of the events that are returned. In other words, all pointers within an |
| 1577 | * lttng_event must point to a location within the returned buffer so that the |
| 1578 | * user may free everything by simply calling free() on the returned buffer. |
| 1579 | * This is needed in order to maintain API compatibility. |
| 1580 | * |
| 1581 | * A first pass is performed to compute the size of the buffer that must be |
| 1582 | * allocated. A second pass is then performed to setup the returned events so |
| 1583 | * that their members always point within the buffer. |
| 1584 | * |
| 1585 | * The layout of the returned buffer is as follows: |
| 1586 | * - struct lttng_event[nb_events], |
| 1587 | * - nb_events times the following: |
| 1588 | * - struct lttng_event_extended, |
| 1589 | * - filter_expression |
| 1590 | * - exclusions |
| 1591 | * - padding to align to 64-bits |
| 1592 | * - flattened version of userspace_probe_location |
| 1593 | */ |
| 1594 | static enum lttng_error_code flatten_lttng_events( |
| 1595 | struct lttng_dynamic_pointer_array *events, |
| 1596 | struct lttng_event **flattened_events) |
| 1597 | { |
| 1598 | enum lttng_error_code ret_code; |
| 1599 | int ret, i; |
| 1600 | size_t storage_req; |
| 1601 | struct lttng_dynamic_buffer local_flattened_events; |
| 1602 | int nb_events; |
| 1603 | |
| 1604 | assert(events); |
| 1605 | assert(flattened_events); |
| 1606 | |
| 1607 | lttng_dynamic_buffer_init(&local_flattened_events); |
| 1608 | nb_events = lttng_dynamic_pointer_array_get_count(events); |
| 1609 | |
| 1610 | ret_code = compute_flattened_size(events, &storage_req); |
| 1611 | if (ret_code != LTTNG_OK) { |
| 1612 | goto end; |
| 1613 | } |
| 1614 | |
| 1615 | /* |
| 1616 | * We must ensure that "local_flattened_events" is never resized so as |
| 1617 | * to preserve the validity of the flattened objects. |
| 1618 | */ |
| 1619 | ret = lttng_dynamic_buffer_set_capacity( |
| 1620 | &local_flattened_events, storage_req); |
| 1621 | if (ret) { |
| 1622 | ret_code = LTTNG_ERR_NOMEM; |
| 1623 | goto end; |
| 1624 | } |
| 1625 | |
| 1626 | /* Start by laying the struct lttng_event */ |
| 1627 | for (i = 0; i < nb_events; i++) { |
| 1628 | struct event_list_element *element = |
| 1629 | lttng_dynamic_pointer_array_get_pointer( |
| 1630 | events, i); |
| 1631 | |
| 1632 | if (!element) { |
| 1633 | ret_code = LTTNG_ERR_FATAL; |
| 1634 | goto end; |
| 1635 | } |
| 1636 | ret = lttng_dynamic_buffer_append(&local_flattened_events, |
| 1637 | element->event, sizeof(struct lttng_event)); |
| 1638 | if (ret) { |
| 1639 | ret_code = LTTNG_ERR_NOMEM; |
| 1640 | goto end; |
| 1641 | } |
| 1642 | } |
| 1643 | |
| 1644 | for (i = 0; i < nb_events; i++) { |
| 1645 | struct event_list_element *element = lttng_dynamic_pointer_array_get_pointer(events, i); |
| 1646 | struct lttng_event *event = (struct lttng_event *) |
| 1647 | (local_flattened_events.data + (sizeof(struct lttng_event) * i)); |
| 1648 | struct lttng_event_extended *event_extended = |
| 1649 | (struct lttng_event_extended *) |
| 1650 | (local_flattened_events.data + local_flattened_events.size); |
| 1651 | const struct lttng_userspace_probe_location *location = NULL; |
| 1652 | |
| 1653 | assert(element); |
| 1654 | |
| 1655 | /* Insert struct lttng_event_extended. */ |
| 1656 | ret = lttng_dynamic_buffer_set_size(&local_flattened_events, |
| 1657 | local_flattened_events.size + |
| 1658 | sizeof(*event_extended)); |
| 1659 | if (ret) { |
| 1660 | ret_code = LTTNG_ERR_NOMEM; |
| 1661 | goto end; |
| 1662 | } |
| 1663 | event->extended.ptr = event_extended; |
| 1664 | |
| 1665 | /* Insert filter expression. */ |
| 1666 | if (element->filter_expression) { |
| 1667 | size_t len = strlen(element->filter_expression) + 1; |
| 1668 | |
| 1669 | event_extended->filter_expression = |
| 1670 | local_flattened_events.data + |
| 1671 | local_flattened_events.size; |
| 1672 | ret = lttng_dynamic_buffer_append( |
| 1673 | &local_flattened_events, |
| 1674 | element->filter_expression, len); |
| 1675 | if (ret) { |
| 1676 | ret_code = LTTNG_ERR_NOMEM; |
| 1677 | goto end; |
| 1678 | } |
| 1679 | } |
| 1680 | |
| 1681 | /* Insert exclusions. */ |
| 1682 | if (element->exclusions) { |
| 1683 | event_extended->exclusions.count = |
| 1684 | element->exclusions->count; |
| 1685 | event_extended->exclusions.strings = |
| 1686 | local_flattened_events.data + |
| 1687 | local_flattened_events.size; |
| 1688 | |
| 1689 | ret = lttng_dynamic_buffer_append( |
| 1690 | &local_flattened_events, |
| 1691 | element->exclusions->names, |
| 1692 | element->exclusions->count * |
| 1693 | LTTNG_SYMBOL_NAME_LEN); |
| 1694 | if (ret) { |
| 1695 | ret_code = LTTNG_ERR_NOMEM; |
| 1696 | goto end; |
| 1697 | } |
| 1698 | } |
| 1699 | |
| 1700 | /* Insert padding to align to 64-bits. */ |
| 1701 | ret = lttng_dynamic_buffer_set_size(&local_flattened_events, |
| 1702 | ALIGN_TO(local_flattened_events.size, |
| 1703 | sizeof(uint64_t))); |
| 1704 | if (ret) { |
| 1705 | ret_code = LTTNG_ERR_NOMEM; |
| 1706 | goto end; |
| 1707 | } |
| 1708 | |
| 1709 | location = lttng_event_get_userspace_probe_location( |
| 1710 | element->event); |
| 1711 | if (location) { |
| 1712 | event_extended->probe_location = (struct lttng_userspace_probe_location *) |
| 1713 | (local_flattened_events.data + local_flattened_events.size); |
| 1714 | ret = lttng_userspace_probe_location_flatten( |
| 1715 | location, &local_flattened_events); |
| 1716 | if (ret < 0) { |
| 1717 | ret_code = LTTNG_ERR_PROBE_LOCATION_INVAL; |
| 1718 | goto end; |
| 1719 | } |
| 1720 | } |
| 1721 | } |
| 1722 | |
| 1723 | /* Don't reset local_flattened_events buffer as we return its content. */ |
| 1724 | *flattened_events = (struct lttng_event *) local_flattened_events.data; |
| 1725 | lttng_dynamic_buffer_init(&local_flattened_events); |
| 1726 | ret_code = LTTNG_OK; |
| 1727 | end: |
| 1728 | lttng_dynamic_buffer_reset(&local_flattened_events); |
| 1729 | return ret_code; |
| 1730 | } |
| 1731 | |
| 1732 | static enum lttng_error_code event_list_create_from_buffer( |
| 1733 | const struct lttng_buffer_view *view, |
| 1734 | unsigned int count, |
| 1735 | struct lttng_dynamic_pointer_array *event_list) |
| 1736 | { |
| 1737 | enum lttng_error_code ret_code; |
| 1738 | int ret; |
| 1739 | unsigned int i; |
| 1740 | int offset = 0; |
| 1741 | |
| 1742 | assert(view); |
| 1743 | assert(event_list); |
| 1744 | |
| 1745 | for (i = 0; i < count; i++) { |
| 1746 | ssize_t event_size; |
| 1747 | const struct lttng_buffer_view event_view = |
| 1748 | lttng_buffer_view_from_view(view, offset, -1); |
| 1749 | struct event_list_element *element = zmalloc(sizeof(*element)); |
| 1750 | |
| 1751 | if (!element) { |
| 1752 | ret_code = LTTNG_ERR_NOMEM; |
| 1753 | goto end; |
| 1754 | } |
| 1755 | |
| 1756 | /* |
| 1757 | * Lifetime and management of the object is now bound to the |
| 1758 | * array. |
| 1759 | */ |
| 1760 | ret = lttng_dynamic_pointer_array_add_pointer( |
| 1761 | event_list, element); |
| 1762 | if (ret) { |
| 1763 | event_list_destructor(element); |
| 1764 | ret_code = LTTNG_ERR_NOMEM; |
| 1765 | goto end; |
| 1766 | } |
| 1767 | |
| 1768 | /* |
| 1769 | * Bytecode is not transmitted on listing in any case we do not |
| 1770 | * care about it. |
| 1771 | */ |
| 1772 | event_size = lttng_event_create_from_buffer(&event_view, |
| 1773 | &element->event, |
| 1774 | &element->exclusions, |
| 1775 | &element->filter_expression, NULL, -1); |
| 1776 | if (event_size < 0) { |
| 1777 | ret_code = LTTNG_ERR_INVALID; |
| 1778 | goto end; |
| 1779 | } |
| 1780 | |
| 1781 | offset += event_size; |
| 1782 | } |
| 1783 | |
| 1784 | if (view->size != offset) { |
| 1785 | ret_code = LTTNG_ERR_INVALID; |
| 1786 | goto end; |
| 1787 | } |
| 1788 | |
| 1789 | ret_code = LTTNG_OK; |
| 1790 | |
| 1791 | end: |
| 1792 | return ret_code; |
| 1793 | } |
| 1794 | |
| 1795 | LTTNG_HIDDEN |
| 1796 | enum lttng_error_code lttng_events_create_and_flatten_from_buffer( |
| 1797 | const struct lttng_buffer_view *view, |
| 1798 | unsigned int count, |
| 1799 | struct lttng_event **events) |
| 1800 | { |
| 1801 | enum lttng_error_code ret = LTTNG_OK; |
| 1802 | struct lttng_dynamic_pointer_array local_events; |
| 1803 | |
| 1804 | lttng_dynamic_pointer_array_init(&local_events, event_list_destructor); |
| 1805 | |
| 1806 | /* Deserialize the events */ |
| 1807 | { |
| 1808 | const struct lttng_buffer_view events_view = |
| 1809 | lttng_buffer_view_from_view(view, 0, -1); |
| 1810 | |
| 1811 | ret = event_list_create_from_buffer( |
| 1812 | &events_view, count, &local_events); |
| 1813 | if (ret != LTTNG_OK) { |
| 1814 | goto end; |
| 1815 | } |
| 1816 | } |
| 1817 | |
| 1818 | ret = flatten_lttng_events(&local_events, events); |
| 1819 | if (ret != LTTNG_OK) { |
| 1820 | goto end; |
| 1821 | } |
| 1822 | |
| 1823 | end: |
| 1824 | lttng_dynamic_pointer_array_reset(&local_events); |
| 1825 | return ret; |
| 1826 | } |
| 1827 | |
| 1828 | static enum lttng_error_code flatten_lttng_event_fields( |
| 1829 | struct lttng_dynamic_pointer_array *event_fields, |
| 1830 | struct lttng_event_field **flattened_event_fields) |
| 1831 | { |
| 1832 | int ret, i; |
| 1833 | enum lttng_error_code ret_code; |
| 1834 | size_t storage_req = 0; |
| 1835 | struct lttng_dynamic_buffer local_flattened_event_fields; |
| 1836 | int nb_event_field; |
| 1837 | |
| 1838 | assert(event_fields); |
| 1839 | assert(flattened_event_fields); |
| 1840 | |
| 1841 | lttng_dynamic_buffer_init(&local_flattened_event_fields); |
| 1842 | nb_event_field = lttng_dynamic_pointer_array_get_count(event_fields); |
| 1843 | |
| 1844 | /* |
| 1845 | * Here even if the event field contains a `struct lttng_event` that |
| 1846 | * could contain dynamic data, in reality it is not the case. |
| 1847 | * Dynamic data is not present. Here the flattening is mostly a direct |
| 1848 | * memcpy. This is less than ideal but this code is still better than |
| 1849 | * direct usage of an unpacked lttng_event_field array. |
| 1850 | */ |
| 1851 | storage_req += sizeof(struct lttng_event_field) * nb_event_field; |
| 1852 | |
| 1853 | lttng_dynamic_buffer_init(&local_flattened_event_fields); |
| 1854 | |
| 1855 | /* |
| 1856 | * We must ensure that "local_flattened_event_fields" is never resized |
| 1857 | * so as to preserve the validity of the flattened objects. |
| 1858 | */ |
| 1859 | ret = lttng_dynamic_buffer_set_capacity( |
| 1860 | &local_flattened_event_fields, storage_req); |
| 1861 | if (ret) { |
| 1862 | ret_code = LTTNG_ERR_NOMEM; |
| 1863 | goto end; |
| 1864 | } |
| 1865 | |
| 1866 | for (i = 0; i < nb_event_field; i++) { |
| 1867 | const struct lttng_event_field *element = |
| 1868 | lttng_dynamic_pointer_array_get_pointer( |
| 1869 | event_fields, i); |
| 1870 | |
| 1871 | if (!element) { |
| 1872 | ret_code = LTTNG_ERR_FATAL; |
| 1873 | goto end; |
| 1874 | } |
| 1875 | ret = lttng_dynamic_buffer_append(&local_flattened_event_fields, |
| 1876 | element, sizeof(struct lttng_event_field)); |
| 1877 | if (ret) { |
| 1878 | ret_code = LTTNG_ERR_NOMEM; |
| 1879 | goto end; |
| 1880 | } |
| 1881 | } |
| 1882 | |
| 1883 | /* Don't reset local_flattened_channels buffer as we return its content. */ |
| 1884 | *flattened_event_fields = (struct lttng_event_field *) local_flattened_event_fields.data; |
| 1885 | lttng_dynamic_buffer_init(&local_flattened_event_fields); |
| 1886 | ret_code = LTTNG_OK; |
| 1887 | end: |
| 1888 | lttng_dynamic_buffer_reset(&local_flattened_event_fields); |
| 1889 | return ret_code; |
| 1890 | } |
| 1891 | |
| 1892 | static enum lttng_error_code event_field_list_create_from_buffer( |
| 1893 | const struct lttng_buffer_view *view, |
| 1894 | unsigned int count, |
| 1895 | struct lttng_dynamic_pointer_array **event_field_list) |
| 1896 | { |
| 1897 | enum lttng_error_code ret_code; |
| 1898 | int ret, offset = 0; |
| 1899 | unsigned int i; |
| 1900 | struct lttng_dynamic_pointer_array *list = NULL; |
| 1901 | |
| 1902 | assert(view); |
| 1903 | assert(event_field_list); |
| 1904 | |
| 1905 | list = zmalloc(sizeof(*list)); |
| 1906 | if (!list) { |
| 1907 | ret_code = LTTNG_ERR_NOMEM; |
| 1908 | goto end; |
| 1909 | } |
| 1910 | |
| 1911 | lttng_dynamic_pointer_array_init(list, free); |
| 1912 | |
| 1913 | for (i = 0; i < count; i++) { |
| 1914 | ssize_t event_field_size; |
| 1915 | struct lttng_event_field *field = NULL; |
| 1916 | const struct lttng_buffer_view event_field_view = |
| 1917 | lttng_buffer_view_from_view(view, offset, -1); |
| 1918 | |
| 1919 | event_field_size = lttng_event_field_create_from_buffer( |
| 1920 | &event_field_view, &field); |
| 1921 | if (event_field_size < 0) { |
| 1922 | ret_code = LTTNG_ERR_INVALID; |
| 1923 | goto end; |
| 1924 | } |
| 1925 | |
| 1926 | /* Lifetime and management of the object is now bound to the array. */ |
| 1927 | ret = lttng_dynamic_pointer_array_add_pointer(list, field); |
| 1928 | if (ret) { |
| 1929 | free(field); |
| 1930 | ret_code = LTTNG_ERR_NOMEM; |
| 1931 | goto end; |
| 1932 | } |
| 1933 | offset += event_field_size; |
| 1934 | } |
| 1935 | |
| 1936 | if (view->size != offset) { |
| 1937 | ret_code = LTTNG_ERR_INVALID; |
| 1938 | goto end; |
| 1939 | } |
| 1940 | |
| 1941 | *event_field_list = list; |
| 1942 | list = NULL; |
| 1943 | ret_code = LTTNG_OK; |
| 1944 | |
| 1945 | end: |
| 1946 | if (list) { |
| 1947 | lttng_dynamic_pointer_array_reset(list); |
| 1948 | free(list); |
| 1949 | } |
| 1950 | return ret_code; |
| 1951 | } |
| 1952 | |
| 1953 | LTTNG_HIDDEN |
| 1954 | enum lttng_error_code lttng_event_fields_create_and_flatten_from_buffer( |
| 1955 | const struct lttng_buffer_view *view, |
| 1956 | unsigned int count, |
| 1957 | struct lttng_event_field **fields) |
| 1958 | { |
| 1959 | enum lttng_error_code ret; |
| 1960 | struct lttng_dynamic_pointer_array *local_event_fields = NULL; |
| 1961 | |
| 1962 | ret = event_field_list_create_from_buffer( |
| 1963 | view, count, &local_event_fields); |
| 1964 | if (ret != LTTNG_OK) { |
| 1965 | goto end; |
| 1966 | } |
| 1967 | |
| 1968 | ret = flatten_lttng_event_fields(local_event_fields, fields); |
| 1969 | if (ret != LTTNG_OK) { |
| 1970 | goto end; |
| 1971 | } |
| 1972 | end: |
| 1973 | if (local_event_fields) { |
| 1974 | lttng_dynamic_pointer_array_reset(local_event_fields); |
| 1975 | free(local_event_fields); |
| 1976 | } |
| 1977 | return ret; |
| 1978 | } |