| 1 | /* |
| 2 | * Copyright (C) 2020 Jonathan Rajotte <jonathan.rajotte-julien@efficios.com> |
| 3 | * |
| 4 | * SPDX-License-Identifier: LGPL-2.1-only |
| 5 | * |
| 6 | */ |
| 7 | |
| 8 | #include <assert.h> |
| 9 | #include <common/error.h> |
| 10 | #include <common/event-expr-to-bytecode.h> |
| 11 | #include <common/macros.h> |
| 12 | #include <inttypes.h> |
| 13 | #include <limits.h> |
| 14 | #include <lttng/condition/condition-internal.h> |
| 15 | #include <lttng/condition/on-event-internal.h> |
| 16 | #include <lttng/condition/on-event.h> |
| 17 | #include <lttng/event-expr-internal.h> |
| 18 | #include <lttng/event-expr.h> |
| 19 | #include <lttng/event-field-value-internal.h> |
| 20 | #include <lttng/event-rule/event-rule-internal.h> |
| 21 | #include <lttng/lttng-error.h> |
| 22 | #include <stdbool.h> |
| 23 | #include <stdint.h> |
| 24 | #include <vendor/msgpack/msgpack.h> |
| 25 | |
| 26 | #define IS_EVENT_RULE_CONDITION(condition) \ |
| 27 | (lttng_condition_get_type(condition) == \ |
| 28 | LTTNG_CONDITION_TYPE_ON_EVENT) |
| 29 | |
| 30 | static bool is_event_rule_evaluation(const struct lttng_evaluation *evaluation) |
| 31 | { |
| 32 | enum lttng_condition_type type = lttng_evaluation_get_type(evaluation); |
| 33 | |
| 34 | return type == LTTNG_CONDITION_TYPE_ON_EVENT; |
| 35 | } |
| 36 | |
| 37 | static bool lttng_condition_on_event_validate( |
| 38 | const struct lttng_condition *condition); |
| 39 | static int lttng_condition_on_event_serialize( |
| 40 | const struct lttng_condition *condition, |
| 41 | struct lttng_payload *payload); |
| 42 | static bool lttng_condition_on_event_is_equal( |
| 43 | const struct lttng_condition *_a, |
| 44 | const struct lttng_condition *_b); |
| 45 | static void lttng_condition_on_event_destroy( |
| 46 | struct lttng_condition *condition); |
| 47 | |
| 48 | static bool lttng_condition_on_event_validate( |
| 49 | const struct lttng_condition *condition) |
| 50 | { |
| 51 | bool valid = false; |
| 52 | struct lttng_condition_on_event *event_rule; |
| 53 | |
| 54 | if (!condition) { |
| 55 | goto end; |
| 56 | } |
| 57 | |
| 58 | event_rule = container_of( |
| 59 | condition, struct lttng_condition_on_event, parent); |
| 60 | if (!event_rule->rule) { |
| 61 | ERR("Invalid event rule condition: a rule must be set."); |
| 62 | goto end; |
| 63 | } |
| 64 | |
| 65 | valid = lttng_event_rule_validate(event_rule->rule); |
| 66 | end: |
| 67 | return valid; |
| 68 | } |
| 69 | |
| 70 | /* |
| 71 | * Serializes the C string `str` into `buf`. |
| 72 | * |
| 73 | * Encoding is the length of `str` plus one (for the null character), |
| 74 | * and then the string, including its null terminator. |
| 75 | */ |
| 76 | static |
| 77 | int serialize_cstr(const char *str, struct lttng_dynamic_buffer *buf) |
| 78 | { |
| 79 | int ret; |
| 80 | const uint32_t len = strlen(str) + 1; |
| 81 | |
| 82 | /* Serialize the length, including the null terminator. */ |
| 83 | DBG("Serializing C string's length (including null terminator): " |
| 84 | "%" PRIu32, len); |
| 85 | ret = lttng_dynamic_buffer_append(buf, &len, sizeof(len)); |
| 86 | if (ret) { |
| 87 | goto end; |
| 88 | } |
| 89 | |
| 90 | /* Serialize the string. */ |
| 91 | DBG("Serializing C string: '%s'", str); |
| 92 | ret = lttng_dynamic_buffer_append(buf, str, len); |
| 93 | if (ret) { |
| 94 | goto end; |
| 95 | } |
| 96 | |
| 97 | end: |
| 98 | return ret; |
| 99 | } |
| 100 | |
| 101 | /* |
| 102 | * Serializes the event expression `expr` into `buf`. |
| 103 | */ |
| 104 | static |
| 105 | int serialize_event_expr(const struct lttng_event_expr *expr, |
| 106 | struct lttng_payload *payload) |
| 107 | { |
| 108 | const uint8_t type = expr->type; |
| 109 | int ret; |
| 110 | |
| 111 | /* Serialize the expression's type. */ |
| 112 | DBG("Serializing event expression's type: %d", expr->type); |
| 113 | ret = lttng_dynamic_buffer_append(&payload->buffer, &type, sizeof(type)); |
| 114 | if (ret) { |
| 115 | goto end; |
| 116 | } |
| 117 | |
| 118 | /* Serialize the expression */ |
| 119 | switch (expr->type) { |
| 120 | case LTTNG_EVENT_EXPR_TYPE_EVENT_PAYLOAD_FIELD: |
| 121 | case LTTNG_EVENT_EXPR_TYPE_CHANNEL_CONTEXT_FIELD: |
| 122 | { |
| 123 | const struct lttng_event_expr_field *field_expr = |
| 124 | container_of(expr, |
| 125 | const struct lttng_event_expr_field, |
| 126 | parent); |
| 127 | |
| 128 | /* Serialize the field name. */ |
| 129 | DBG("Serializing field event expression's field name: '%s'", |
| 130 | field_expr->name); |
| 131 | ret = serialize_cstr(field_expr->name, &payload->buffer); |
| 132 | if (ret) { |
| 133 | goto end; |
| 134 | } |
| 135 | |
| 136 | break; |
| 137 | } |
| 138 | case LTTNG_EVENT_EXPR_TYPE_APP_SPECIFIC_CONTEXT_FIELD: |
| 139 | { |
| 140 | const struct lttng_event_expr_app_specific_context_field *field_expr = |
| 141 | container_of(expr, |
| 142 | const struct lttng_event_expr_app_specific_context_field, |
| 143 | parent); |
| 144 | |
| 145 | /* Serialize the provider name. */ |
| 146 | DBG("Serializing app-specific context field event expression's " |
| 147 | "provider name: '%s'", |
| 148 | field_expr->provider_name); |
| 149 | ret = serialize_cstr(field_expr->provider_name, &payload->buffer); |
| 150 | if (ret) { |
| 151 | goto end; |
| 152 | } |
| 153 | |
| 154 | /* Serialize the type name. */ |
| 155 | DBG("Serializing app-specific context field event expression's " |
| 156 | "type name: '%s'", |
| 157 | field_expr->provider_name); |
| 158 | ret = serialize_cstr(field_expr->type_name, &payload->buffer); |
| 159 | if (ret) { |
| 160 | goto end; |
| 161 | } |
| 162 | |
| 163 | break; |
| 164 | } |
| 165 | case LTTNG_EVENT_EXPR_TYPE_ARRAY_FIELD_ELEMENT: |
| 166 | { |
| 167 | const struct lttng_event_expr_array_field_element *elem_expr = |
| 168 | container_of(expr, |
| 169 | const struct lttng_event_expr_array_field_element, |
| 170 | parent); |
| 171 | const uint32_t index = elem_expr->index; |
| 172 | |
| 173 | /* Serialize the index. */ |
| 174 | DBG("Serializing array field element event expression's " |
| 175 | "index: %u", elem_expr->index); |
| 176 | ret = lttng_dynamic_buffer_append(&payload->buffer, &index, sizeof(index)); |
| 177 | if (ret) { |
| 178 | goto end; |
| 179 | } |
| 180 | |
| 181 | /* Serialize the parent array field expression. */ |
| 182 | DBG("Serializing array field element event expression's " |
| 183 | "parent array field event expression."); |
| 184 | ret = serialize_event_expr(elem_expr->array_field_expr, payload); |
| 185 | if (ret) { |
| 186 | goto end; |
| 187 | } |
| 188 | |
| 189 | break; |
| 190 | } |
| 191 | default: |
| 192 | break; |
| 193 | } |
| 194 | |
| 195 | end: |
| 196 | return ret; |
| 197 | } |
| 198 | |
| 199 | static |
| 200 | struct lttng_capture_descriptor * |
| 201 | lttng_condition_on_event_get_internal_capture_descriptor_at_index( |
| 202 | const struct lttng_condition *condition, unsigned int index) |
| 203 | { |
| 204 | const struct lttng_condition_on_event *event_rule_cond = |
| 205 | container_of(condition, |
| 206 | const struct lttng_condition_on_event, |
| 207 | parent); |
| 208 | struct lttng_capture_descriptor *desc = NULL; |
| 209 | unsigned int count; |
| 210 | enum lttng_condition_status status; |
| 211 | |
| 212 | if (!condition || !IS_EVENT_RULE_CONDITION(condition)) { |
| 213 | goto end; |
| 214 | } |
| 215 | |
| 216 | status = lttng_condition_on_event_get_capture_descriptor_count( |
| 217 | condition, &count); |
| 218 | if (status != LTTNG_CONDITION_STATUS_OK) { |
| 219 | goto end; |
| 220 | } |
| 221 | |
| 222 | if (index >= count) { |
| 223 | goto end; |
| 224 | } |
| 225 | |
| 226 | desc = lttng_dynamic_pointer_array_get_pointer( |
| 227 | &event_rule_cond->capture_descriptors, index); |
| 228 | end: |
| 229 | return desc; |
| 230 | } |
| 231 | |
| 232 | static int lttng_condition_on_event_serialize( |
| 233 | const struct lttng_condition *condition, |
| 234 | struct lttng_payload *payload) |
| 235 | { |
| 236 | int ret; |
| 237 | struct lttng_condition_on_event *event_rule; |
| 238 | enum lttng_condition_status status; |
| 239 | uint64_t error_count, error_counter_index; |
| 240 | /* Used for iteration and communication (size matters). */ |
| 241 | uint32_t i, capture_descr_count; |
| 242 | |
| 243 | if (!condition || !IS_EVENT_RULE_CONDITION(condition)) { |
| 244 | ret = -1; |
| 245 | goto end; |
| 246 | } |
| 247 | |
| 248 | DBG("Serializing event rule condition"); |
| 249 | event_rule = container_of( |
| 250 | condition, struct lttng_condition_on_event, parent); |
| 251 | |
| 252 | DBG("Serializing event rule condition's event rule"); |
| 253 | ret = lttng_event_rule_serialize(event_rule->rule, payload); |
| 254 | if (ret) { |
| 255 | goto end; |
| 256 | } |
| 257 | |
| 258 | error_counter_index = lttng_condition_on_event_get_error_counter_index( |
| 259 | condition); |
| 260 | DBG("Serializing event rule condition's error counter index: %" PRIu64, |
| 261 | error_counter_index); |
| 262 | ret = lttng_dynamic_buffer_append(&payload->buffer, &error_counter_index, |
| 263 | sizeof(error_counter_index)); |
| 264 | if (ret) { |
| 265 | goto end; |
| 266 | } |
| 267 | |
| 268 | error_count = lttng_condition_on_event_get_error_count( |
| 269 | condition); |
| 270 | DBG("Serializing event rule condition's error count: %" PRIu64, |
| 271 | error_count); |
| 272 | ret = lttng_dynamic_buffer_append(&payload->buffer, &error_count, |
| 273 | sizeof(error_count)); |
| 274 | if (ret) { |
| 275 | goto end; |
| 276 | } |
| 277 | |
| 278 | status = lttng_condition_on_event_get_capture_descriptor_count( |
| 279 | condition, &capture_descr_count); |
| 280 | if (status != LTTNG_CONDITION_STATUS_OK) { |
| 281 | ret = -1; |
| 282 | goto end; |
| 283 | }; |
| 284 | |
| 285 | DBG("Serializing event rule condition's capture descriptor count: %" PRIu32, |
| 286 | capture_descr_count); |
| 287 | ret = lttng_dynamic_buffer_append(&payload->buffer, &capture_descr_count, |
| 288 | sizeof(capture_descr_count)); |
| 289 | if (ret) { |
| 290 | goto end; |
| 291 | } |
| 292 | |
| 293 | for (i = 0; i < capture_descr_count; i++) { |
| 294 | const struct lttng_capture_descriptor *desc = |
| 295 | lttng_condition_on_event_get_internal_capture_descriptor_at_index( |
| 296 | condition, i); |
| 297 | |
| 298 | DBG("Serializing event rule condition's capture descriptor %" PRIu32, |
| 299 | i); |
| 300 | ret = serialize_event_expr(desc->event_expression, payload); |
| 301 | if (ret) { |
| 302 | goto end; |
| 303 | } |
| 304 | } |
| 305 | |
| 306 | end: |
| 307 | return ret; |
| 308 | } |
| 309 | |
| 310 | static |
| 311 | bool capture_descriptors_are_equal( |
| 312 | const struct lttng_condition *condition_a, |
| 313 | const struct lttng_condition *condition_b) |
| 314 | { |
| 315 | bool is_equal = true; |
| 316 | unsigned int capture_descr_count_a; |
| 317 | unsigned int capture_descr_count_b; |
| 318 | size_t i; |
| 319 | enum lttng_condition_status status; |
| 320 | |
| 321 | status = lttng_condition_on_event_get_capture_descriptor_count( |
| 322 | condition_a, &capture_descr_count_a); |
| 323 | if (status != LTTNG_CONDITION_STATUS_OK) { |
| 324 | goto not_equal; |
| 325 | } |
| 326 | |
| 327 | status = lttng_condition_on_event_get_capture_descriptor_count( |
| 328 | condition_b, &capture_descr_count_b); |
| 329 | if (status != LTTNG_CONDITION_STATUS_OK) { |
| 330 | goto not_equal; |
| 331 | } |
| 332 | |
| 333 | if (capture_descr_count_a != capture_descr_count_b) { |
| 334 | goto not_equal; |
| 335 | } |
| 336 | |
| 337 | for (i = 0; i < capture_descr_count_a; i++) { |
| 338 | const struct lttng_event_expr *expr_a = |
| 339 | lttng_condition_on_event_get_capture_descriptor_at_index( |
| 340 | condition_a, |
| 341 | i); |
| 342 | const struct lttng_event_expr *expr_b = |
| 343 | lttng_condition_on_event_get_capture_descriptor_at_index( |
| 344 | condition_b, |
| 345 | i); |
| 346 | |
| 347 | if (!lttng_event_expr_is_equal(expr_a, expr_b)) { |
| 348 | goto not_equal; |
| 349 | } |
| 350 | } |
| 351 | |
| 352 | goto end; |
| 353 | |
| 354 | not_equal: |
| 355 | is_equal = false; |
| 356 | |
| 357 | end: |
| 358 | return is_equal; |
| 359 | } |
| 360 | |
| 361 | static bool lttng_condition_on_event_is_equal( |
| 362 | const struct lttng_condition *_a, |
| 363 | const struct lttng_condition *_b) |
| 364 | { |
| 365 | bool is_equal = false; |
| 366 | struct lttng_condition_on_event *a, *b; |
| 367 | |
| 368 | a = container_of(_a, struct lttng_condition_on_event, parent); |
| 369 | b = container_of(_b, struct lttng_condition_on_event, parent); |
| 370 | |
| 371 | /* Both event rules must be set or both must be unset. */ |
| 372 | if ((a->rule && !b->rule) || (!a->rule && b->rule)) { |
| 373 | WARN("Comparing event_rule conditions with uninitialized rule"); |
| 374 | goto end; |
| 375 | } |
| 376 | |
| 377 | is_equal = lttng_event_rule_is_equal(a->rule, b->rule); |
| 378 | if (!is_equal) { |
| 379 | goto end; |
| 380 | } |
| 381 | |
| 382 | is_equal = capture_descriptors_are_equal(_a, _b); |
| 383 | |
| 384 | end: |
| 385 | return is_equal; |
| 386 | } |
| 387 | |
| 388 | static void lttng_condition_on_event_destroy( |
| 389 | struct lttng_condition *condition) |
| 390 | { |
| 391 | struct lttng_condition_on_event *event_rule; |
| 392 | |
| 393 | event_rule = container_of( |
| 394 | condition, struct lttng_condition_on_event, parent); |
| 395 | |
| 396 | lttng_event_rule_put(event_rule->rule); |
| 397 | lttng_dynamic_pointer_array_reset(&event_rule->capture_descriptors); |
| 398 | free(event_rule); |
| 399 | } |
| 400 | |
| 401 | static |
| 402 | void destroy_capture_descriptor(void *ptr) |
| 403 | { |
| 404 | struct lttng_capture_descriptor *desc = |
| 405 | (struct lttng_capture_descriptor *) ptr; |
| 406 | |
| 407 | lttng_event_expr_destroy(desc->event_expression); |
| 408 | free(desc->bytecode); |
| 409 | free(desc); |
| 410 | } |
| 411 | |
| 412 | struct lttng_condition *lttng_condition_on_event_create( |
| 413 | struct lttng_event_rule *rule) |
| 414 | { |
| 415 | struct lttng_condition *parent = NULL; |
| 416 | struct lttng_condition_on_event *condition = NULL; |
| 417 | |
| 418 | if (!rule) { |
| 419 | goto end; |
| 420 | } |
| 421 | |
| 422 | condition = zmalloc(sizeof(struct lttng_condition_on_event)); |
| 423 | if (!condition) { |
| 424 | return NULL; |
| 425 | } |
| 426 | |
| 427 | lttng_condition_init(&condition->parent, |
| 428 | LTTNG_CONDITION_TYPE_ON_EVENT); |
| 429 | condition->parent.validate = lttng_condition_on_event_validate, |
| 430 | condition->parent.serialize = lttng_condition_on_event_serialize, |
| 431 | condition->parent.equal = lttng_condition_on_event_is_equal, |
| 432 | condition->parent.destroy = lttng_condition_on_event_destroy, |
| 433 | |
| 434 | lttng_event_rule_get(rule); |
| 435 | condition->rule = rule; |
| 436 | rule = NULL; |
| 437 | |
| 438 | LTTNG_OPTIONAL_SET(&condition->error_count, 0); |
| 439 | LTTNG_OPTIONAL_SET(&condition->error_counter_index, 0); |
| 440 | |
| 441 | lttng_dynamic_pointer_array_init(&condition->capture_descriptors, |
| 442 | destroy_capture_descriptor); |
| 443 | |
| 444 | parent = &condition->parent; |
| 445 | end: |
| 446 | return parent; |
| 447 | } |
| 448 | |
| 449 | static |
| 450 | uint64_t uint_from_buffer(const struct lttng_buffer_view *view, size_t size, |
| 451 | size_t *offset) |
| 452 | { |
| 453 | uint64_t ret; |
| 454 | const struct lttng_buffer_view uint_view = |
| 455 | lttng_buffer_view_from_view(view, *offset, size); |
| 456 | |
| 457 | if (!lttng_buffer_view_is_valid(&uint_view)) { |
| 458 | ret = UINT64_C(-1); |
| 459 | goto end; |
| 460 | } |
| 461 | |
| 462 | switch (size) { |
| 463 | case 1: |
| 464 | ret = (uint64_t) *uint_view.data; |
| 465 | break; |
| 466 | case sizeof(uint32_t): |
| 467 | { |
| 468 | uint32_t u32; |
| 469 | |
| 470 | memcpy(&u32, uint_view.data, sizeof(u32)); |
| 471 | ret = (uint64_t) u32; |
| 472 | break; |
| 473 | } |
| 474 | case sizeof(ret): |
| 475 | memcpy(&ret, uint_view.data, sizeof(ret)); |
| 476 | break; |
| 477 | default: |
| 478 | abort(); |
| 479 | } |
| 480 | |
| 481 | *offset += size; |
| 482 | |
| 483 | end: |
| 484 | return ret; |
| 485 | } |
| 486 | |
| 487 | static |
| 488 | const char *str_from_buffer(const struct lttng_buffer_view *view, |
| 489 | size_t *offset) |
| 490 | { |
| 491 | uint64_t len; |
| 492 | const char *ret; |
| 493 | |
| 494 | len = uint_from_buffer(view, sizeof(uint32_t), offset); |
| 495 | if (len == UINT64_C(-1)) { |
| 496 | goto error; |
| 497 | } |
| 498 | |
| 499 | ret = &view->data[*offset]; |
| 500 | |
| 501 | if (!lttng_buffer_view_contains_string(view, ret, len)) { |
| 502 | goto error; |
| 503 | } |
| 504 | |
| 505 | *offset += len; |
| 506 | goto end; |
| 507 | |
| 508 | error: |
| 509 | ret = NULL; |
| 510 | |
| 511 | end: |
| 512 | return ret; |
| 513 | } |
| 514 | |
| 515 | static |
| 516 | struct lttng_event_expr *event_expr_from_payload( |
| 517 | struct lttng_payload_view *view, size_t *offset) |
| 518 | { |
| 519 | struct lttng_event_expr *expr = NULL; |
| 520 | const char *str; |
| 521 | uint64_t type; |
| 522 | |
| 523 | type = uint_from_buffer(&view->buffer, sizeof(uint8_t), offset); |
| 524 | if (type == UINT64_C(-1)) { |
| 525 | goto error; |
| 526 | } |
| 527 | |
| 528 | switch (type) { |
| 529 | case LTTNG_EVENT_EXPR_TYPE_EVENT_PAYLOAD_FIELD: |
| 530 | str = str_from_buffer(&view->buffer, offset); |
| 531 | if (!str) { |
| 532 | goto error; |
| 533 | } |
| 534 | |
| 535 | expr = lttng_event_expr_event_payload_field_create(str); |
| 536 | break; |
| 537 | case LTTNG_EVENT_EXPR_TYPE_CHANNEL_CONTEXT_FIELD: |
| 538 | str = str_from_buffer(&view->buffer, offset); |
| 539 | if (!str) { |
| 540 | goto error; |
| 541 | } |
| 542 | |
| 543 | expr = lttng_event_expr_channel_context_field_create(str); |
| 544 | break; |
| 545 | case LTTNG_EVENT_EXPR_TYPE_APP_SPECIFIC_CONTEXT_FIELD: |
| 546 | { |
| 547 | const char *provider_name; |
| 548 | const char *type_name; |
| 549 | |
| 550 | provider_name = str_from_buffer(&view->buffer, offset); |
| 551 | if (!provider_name) { |
| 552 | goto error; |
| 553 | } |
| 554 | |
| 555 | type_name = str_from_buffer(&view->buffer, offset); |
| 556 | if (!type_name) { |
| 557 | goto error; |
| 558 | } |
| 559 | |
| 560 | expr = lttng_event_expr_app_specific_context_field_create( |
| 561 | provider_name, type_name); |
| 562 | break; |
| 563 | } |
| 564 | case LTTNG_EVENT_EXPR_TYPE_ARRAY_FIELD_ELEMENT: |
| 565 | { |
| 566 | struct lttng_event_expr *array_field_expr; |
| 567 | const uint64_t index = uint_from_buffer( |
| 568 | &view->buffer, sizeof(uint32_t), offset); |
| 569 | |
| 570 | if (index == UINT64_C(-1)) { |
| 571 | goto error; |
| 572 | } |
| 573 | |
| 574 | /* Array field expression is the encoded after this. */ |
| 575 | array_field_expr = event_expr_from_payload(view, offset); |
| 576 | if (!array_field_expr) { |
| 577 | goto error; |
| 578 | } |
| 579 | |
| 580 | /* Move ownership of `array_field_expr` to new expression. */ |
| 581 | expr = lttng_event_expr_array_field_element_create( |
| 582 | array_field_expr, (unsigned int) index); |
| 583 | if (!expr) { |
| 584 | /* `array_field_expr` not moved: destroy it. */ |
| 585 | lttng_event_expr_destroy(array_field_expr); |
| 586 | } |
| 587 | |
| 588 | break; |
| 589 | } |
| 590 | default: |
| 591 | abort(); |
| 592 | } |
| 593 | |
| 594 | goto end; |
| 595 | |
| 596 | error: |
| 597 | lttng_event_expr_destroy(expr); |
| 598 | expr = NULL; |
| 599 | |
| 600 | end: |
| 601 | return expr; |
| 602 | } |
| 603 | |
| 604 | LTTNG_HIDDEN |
| 605 | ssize_t lttng_condition_on_event_create_from_payload( |
| 606 | struct lttng_payload_view *view, |
| 607 | struct lttng_condition **_condition) |
| 608 | { |
| 609 | ssize_t consumed_length; |
| 610 | size_t offset = 0; |
| 611 | ssize_t event_rule_length; |
| 612 | uint32_t i, capture_descr_count; |
| 613 | uint64_t error_counter_index, error_count; |
| 614 | struct lttng_condition *condition = NULL; |
| 615 | struct lttng_event_rule *event_rule = NULL; |
| 616 | |
| 617 | if (!view || !_condition) { |
| 618 | goto error; |
| 619 | } |
| 620 | |
| 621 | /* Struct lttng_event_rule. */ |
| 622 | { |
| 623 | struct lttng_payload_view event_rule_view = |
| 624 | lttng_payload_view_from_view(view, offset, -1); |
| 625 | |
| 626 | event_rule_length = lttng_event_rule_create_from_payload( |
| 627 | &event_rule_view, &event_rule); |
| 628 | } |
| 629 | |
| 630 | if (event_rule_length < 0 || !event_rule) { |
| 631 | goto error; |
| 632 | } |
| 633 | |
| 634 | offset += event_rule_length; |
| 635 | |
| 636 | /* Error counter index. */ |
| 637 | error_counter_index = uint_from_buffer(&view->buffer, sizeof(uint64_t), |
| 638 | &offset); |
| 639 | if (error_counter_index == UINT64_C(-1)) { |
| 640 | goto error; |
| 641 | } |
| 642 | |
| 643 | /* Error count. */ |
| 644 | error_count = uint_from_buffer(&view->buffer, sizeof(uint64_t), &offset); |
| 645 | if (error_count == UINT64_C(-1)) { |
| 646 | goto error; |
| 647 | } |
| 648 | |
| 649 | /* Create condition (no capture descriptors yet) at this point */ |
| 650 | condition = lttng_condition_on_event_create(event_rule); |
| 651 | if (!condition) { |
| 652 | goto error; |
| 653 | } |
| 654 | |
| 655 | lttng_condition_on_event_set_error_count(condition, error_count); |
| 656 | lttng_condition_on_event_set_error_counter_index(condition, |
| 657 | error_counter_index); |
| 658 | |
| 659 | /* Capture descriptor count. */ |
| 660 | assert(event_rule_length >= 0); |
| 661 | capture_descr_count = uint_from_buffer(&view->buffer, sizeof(uint32_t), &offset); |
| 662 | if (capture_descr_count == UINT32_C(-1)) { |
| 663 | goto error; |
| 664 | } |
| 665 | |
| 666 | /* Capture descriptors. */ |
| 667 | for (i = 0; i < capture_descr_count; i++) { |
| 668 | enum lttng_condition_status status; |
| 669 | struct lttng_event_expr *expr = event_expr_from_payload( |
| 670 | view, &offset); |
| 671 | |
| 672 | if (!expr) { |
| 673 | goto error; |
| 674 | } |
| 675 | |
| 676 | /* Move ownership of `expr` to `condition`. */ |
| 677 | status = lttng_condition_on_event_append_capture_descriptor( |
| 678 | condition, expr); |
| 679 | if (status != LTTNG_CONDITION_STATUS_OK) { |
| 680 | /* `expr` not moved: destroy it. */ |
| 681 | lttng_event_expr_destroy(expr); |
| 682 | goto error; |
| 683 | } |
| 684 | } |
| 685 | |
| 686 | consumed_length = (ssize_t) offset; |
| 687 | *_condition = condition; |
| 688 | condition = NULL; |
| 689 | goto end; |
| 690 | |
| 691 | error: |
| 692 | consumed_length = -1; |
| 693 | |
| 694 | end: |
| 695 | lttng_event_rule_put(event_rule); |
| 696 | lttng_condition_put(condition); |
| 697 | return consumed_length; |
| 698 | } |
| 699 | |
| 700 | LTTNG_HIDDEN |
| 701 | enum lttng_condition_status lttng_condition_on_event_borrow_rule_mutable( |
| 702 | const struct lttng_condition *condition, |
| 703 | struct lttng_event_rule **rule) |
| 704 | { |
| 705 | struct lttng_condition_on_event *event_rule; |
| 706 | enum lttng_condition_status status = LTTNG_CONDITION_STATUS_OK; |
| 707 | |
| 708 | if (!condition || !IS_EVENT_RULE_CONDITION(condition) || !rule) { |
| 709 | status = LTTNG_CONDITION_STATUS_INVALID; |
| 710 | goto end; |
| 711 | } |
| 712 | |
| 713 | event_rule = container_of( |
| 714 | condition, struct lttng_condition_on_event, parent); |
| 715 | if (!event_rule->rule) { |
| 716 | status = LTTNG_CONDITION_STATUS_UNSET; |
| 717 | goto end; |
| 718 | } |
| 719 | |
| 720 | *rule = event_rule->rule; |
| 721 | end: |
| 722 | return status; |
| 723 | } |
| 724 | |
| 725 | enum lttng_condition_status lttng_condition_on_event_get_rule( |
| 726 | const struct lttng_condition *condition, |
| 727 | const struct lttng_event_rule **rule) |
| 728 | { |
| 729 | struct lttng_event_rule *mutable_rule = NULL; |
| 730 | const enum lttng_condition_status status = |
| 731 | lttng_condition_on_event_borrow_rule_mutable( |
| 732 | condition, &mutable_rule); |
| 733 | |
| 734 | *rule = mutable_rule; |
| 735 | return status; |
| 736 | } |
| 737 | |
| 738 | void lttng_condition_on_event_set_error_counter_index( |
| 739 | struct lttng_condition *condition, uint64_t error_counter_index) |
| 740 | { |
| 741 | struct lttng_condition_on_event *on_event_cond = |
| 742 | container_of(condition, |
| 743 | struct lttng_condition_on_event, parent); |
| 744 | |
| 745 | LTTNG_OPTIONAL_SET(&on_event_cond->error_counter_index, error_counter_index); |
| 746 | } |
| 747 | |
| 748 | uint64_t lttng_condition_on_event_get_error_counter_index( |
| 749 | const struct lttng_condition *condition) |
| 750 | { |
| 751 | struct lttng_condition_on_event *on_event_cond = |
| 752 | container_of(condition, |
| 753 | struct lttng_condition_on_event, parent); |
| 754 | |
| 755 | return LTTNG_OPTIONAL_GET(on_event_cond->error_counter_index); |
| 756 | } |
| 757 | |
| 758 | void lttng_condition_on_event_set_error_count(struct lttng_condition *condition, |
| 759 | uint64_t error_count) |
| 760 | { |
| 761 | struct lttng_condition_on_event *on_event_cond = |
| 762 | container_of(condition, |
| 763 | struct lttng_condition_on_event, parent); |
| 764 | |
| 765 | LTTNG_OPTIONAL_SET(&on_event_cond->error_count, error_count); |
| 766 | } |
| 767 | |
| 768 | uint64_t lttng_condition_on_event_get_error_count( |
| 769 | const struct lttng_condition *condition) |
| 770 | { |
| 771 | struct lttng_condition_on_event *on_event_cond = |
| 772 | container_of(condition, |
| 773 | struct lttng_condition_on_event, parent); |
| 774 | |
| 775 | return LTTNG_OPTIONAL_GET(on_event_cond->error_count); |
| 776 | } |
| 777 | |
| 778 | enum lttng_condition_status |
| 779 | lttng_condition_on_event_append_capture_descriptor( |
| 780 | struct lttng_condition *condition, |
| 781 | struct lttng_event_expr *expr) |
| 782 | { |
| 783 | int ret; |
| 784 | enum lttng_condition_status status = LTTNG_CONDITION_STATUS_OK; |
| 785 | struct lttng_condition_on_event *on_event_cond = |
| 786 | container_of(condition, |
| 787 | struct lttng_condition_on_event, parent); |
| 788 | struct lttng_capture_descriptor *descriptor = NULL; |
| 789 | const struct lttng_event_rule *rule = NULL; |
| 790 | |
| 791 | /* Only accept l-values. */ |
| 792 | if (!condition || !IS_EVENT_RULE_CONDITION(condition) || !expr || |
| 793 | !lttng_event_expr_is_lvalue(expr)) { |
| 794 | status = LTTNG_CONDITION_STATUS_INVALID; |
| 795 | goto end; |
| 796 | } |
| 797 | |
| 798 | status = lttng_condition_on_event_get_rule(condition, &rule); |
| 799 | if (status != LTTNG_CONDITION_STATUS_OK) { |
| 800 | goto end; |
| 801 | } |
| 802 | |
| 803 | switch(lttng_event_rule_get_type(rule)) { |
| 804 | case LTTNG_EVENT_RULE_TYPE_TRACEPOINT: |
| 805 | case LTTNG_EVENT_RULE_TYPE_SYSCALL: |
| 806 | /* Supported */ |
| 807 | status = LTTNG_CONDITION_STATUS_OK; |
| 808 | break; |
| 809 | case LTTNG_EVENT_RULE_TYPE_UNKNOWN: |
| 810 | status = LTTNG_CONDITION_STATUS_INVALID; |
| 811 | break; |
| 812 | default: |
| 813 | status = LTTNG_CONDITION_STATUS_UNSUPPORTED; |
| 814 | break; |
| 815 | } |
| 816 | |
| 817 | if (status != LTTNG_CONDITION_STATUS_OK) { |
| 818 | goto end; |
| 819 | } |
| 820 | |
| 821 | descriptor = malloc(sizeof(*descriptor)); |
| 822 | if (descriptor == NULL) { |
| 823 | status = LTTNG_CONDITION_STATUS_ERROR; |
| 824 | goto end; |
| 825 | } |
| 826 | |
| 827 | descriptor->event_expression = expr; |
| 828 | descriptor->bytecode = NULL; |
| 829 | |
| 830 | ret = lttng_dynamic_pointer_array_add_pointer( |
| 831 | &on_event_cond->capture_descriptors, descriptor); |
| 832 | if (ret) { |
| 833 | status = LTTNG_CONDITION_STATUS_ERROR; |
| 834 | goto end; |
| 835 | } |
| 836 | |
| 837 | /* Ownership is transfered to the internal capture_descriptors array */ |
| 838 | descriptor = NULL; |
| 839 | end: |
| 840 | free(descriptor); |
| 841 | return status; |
| 842 | } |
| 843 | |
| 844 | enum lttng_condition_status |
| 845 | lttng_condition_on_event_get_capture_descriptor_count( |
| 846 | const struct lttng_condition *condition, unsigned int *count) |
| 847 | { |
| 848 | enum lttng_condition_status status = LTTNG_CONDITION_STATUS_OK; |
| 849 | const struct lttng_condition_on_event *event_rule_cond = |
| 850 | container_of(condition, |
| 851 | const struct lttng_condition_on_event, |
| 852 | parent); |
| 853 | |
| 854 | if (!condition || !IS_EVENT_RULE_CONDITION(condition) || !count) { |
| 855 | status = LTTNG_CONDITION_STATUS_INVALID; |
| 856 | goto end; |
| 857 | } |
| 858 | |
| 859 | *count = lttng_dynamic_pointer_array_get_count( |
| 860 | &event_rule_cond->capture_descriptors); |
| 861 | |
| 862 | end: |
| 863 | return status; |
| 864 | } |
| 865 | |
| 866 | const struct lttng_event_expr * |
| 867 | lttng_condition_on_event_get_capture_descriptor_at_index( |
| 868 | const struct lttng_condition *condition, unsigned int index) |
| 869 | { |
| 870 | const struct lttng_event_expr *expr = NULL; |
| 871 | const struct lttng_capture_descriptor *desc = NULL; |
| 872 | |
| 873 | desc = lttng_condition_on_event_get_internal_capture_descriptor_at_index( |
| 874 | condition, index); |
| 875 | if (desc == NULL) { |
| 876 | goto end; |
| 877 | } |
| 878 | expr = desc->event_expression; |
| 879 | |
| 880 | end: |
| 881 | return expr; |
| 882 | } |
| 883 | |
| 884 | LTTNG_HIDDEN |
| 885 | ssize_t lttng_evaluation_event_rule_create_from_payload( |
| 886 | const struct lttng_condition_on_event *condition, |
| 887 | struct lttng_payload_view *view, |
| 888 | struct lttng_evaluation **_evaluation) |
| 889 | { |
| 890 | ssize_t ret, offset = 0; |
| 891 | const char *trigger_name; |
| 892 | struct lttng_evaluation *evaluation = NULL; |
| 893 | const struct lttng_evaluation_event_rule_comm *header; |
| 894 | const struct lttng_payload_view header_view = |
| 895 | lttng_payload_view_from_view( |
| 896 | view, 0, sizeof(*header)); |
| 897 | uint32_t capture_payload_size; |
| 898 | const char *capture_payload = NULL; |
| 899 | |
| 900 | if (!_evaluation) { |
| 901 | ret = -1; |
| 902 | goto error; |
| 903 | } |
| 904 | |
| 905 | if (!lttng_payload_view_is_valid(&header_view)) { |
| 906 | ERR("Failed to initialize from malformed event rule evaluation: buffer too short to contain header"); |
| 907 | ret = -1; |
| 908 | goto error; |
| 909 | } |
| 910 | |
| 911 | header = (typeof(header)) header_view.buffer.data; |
| 912 | |
| 913 | /* Map the originating trigger's name. */ |
| 914 | offset += sizeof(*header); |
| 915 | { |
| 916 | const struct lttng_payload_view current_view = |
| 917 | lttng_payload_view_from_view(view, offset, |
| 918 | header->trigger_name_length); |
| 919 | |
| 920 | if (!lttng_payload_view_is_valid(¤t_view)) { |
| 921 | ERR("Failed to initialize from malformed event rule evaluation: buffer too short to contain trigger name"); |
| 922 | ret = -1; |
| 923 | goto error; |
| 924 | } |
| 925 | |
| 926 | trigger_name = current_view.buffer.data; |
| 927 | if (!lttng_buffer_view_contains_string(¤t_view.buffer, |
| 928 | trigger_name, header->trigger_name_length)) { |
| 929 | ERR("Failed to initialize from malformed event rule evaluation: invalid trigger name"); |
| 930 | ret = -1; |
| 931 | goto error; |
| 932 | } |
| 933 | } |
| 934 | |
| 935 | offset += header->trigger_name_length; |
| 936 | { |
| 937 | const struct lttng_payload_view current_view = |
| 938 | lttng_payload_view_from_view(view, offset, -1); |
| 939 | |
| 940 | if (current_view.buffer.size < sizeof(capture_payload_size)) { |
| 941 | ret = -1; |
| 942 | goto error; |
| 943 | } |
| 944 | |
| 945 | memcpy(&capture_payload_size, current_view.buffer.data, |
| 946 | sizeof(capture_payload_size)); |
| 947 | } |
| 948 | offset += sizeof(capture_payload_size); |
| 949 | |
| 950 | if (capture_payload_size > 0) { |
| 951 | const struct lttng_payload_view current_view = |
| 952 | lttng_payload_view_from_view(view, offset, -1); |
| 953 | |
| 954 | if (current_view.buffer.size < capture_payload_size) { |
| 955 | ret = -1; |
| 956 | goto error; |
| 957 | } |
| 958 | |
| 959 | capture_payload = current_view.buffer.data; |
| 960 | } |
| 961 | |
| 962 | evaluation = lttng_evaluation_event_rule_create(condition, trigger_name, |
| 963 | capture_payload, capture_payload_size, true); |
| 964 | if (!evaluation) { |
| 965 | ret = -1; |
| 966 | goto error; |
| 967 | } |
| 968 | |
| 969 | offset += capture_payload_size; |
| 970 | *_evaluation = evaluation; |
| 971 | evaluation = NULL; |
| 972 | ret = offset; |
| 973 | |
| 974 | error: |
| 975 | lttng_evaluation_destroy(evaluation); |
| 976 | return ret; |
| 977 | } |
| 978 | |
| 979 | static int lttng_evaluation_event_rule_serialize( |
| 980 | const struct lttng_evaluation *evaluation, |
| 981 | struct lttng_payload *payload) |
| 982 | { |
| 983 | int ret = 0; |
| 984 | struct lttng_evaluation_event_rule *hit; |
| 985 | struct lttng_evaluation_event_rule_comm comm; |
| 986 | uint32_t capture_payload_size; |
| 987 | |
| 988 | hit = container_of( |
| 989 | evaluation, struct lttng_evaluation_event_rule, parent); |
| 990 | |
| 991 | assert(hit->name); |
| 992 | comm.trigger_name_length = strlen(hit->name) + 1; |
| 993 | |
| 994 | ret = lttng_dynamic_buffer_append( |
| 995 | &payload->buffer, &comm, sizeof(comm)); |
| 996 | if (ret) { |
| 997 | goto end; |
| 998 | } |
| 999 | |
| 1000 | ret = lttng_dynamic_buffer_append( |
| 1001 | &payload->buffer, hit->name, comm.trigger_name_length); |
| 1002 | if (ret) { |
| 1003 | goto end; |
| 1004 | } |
| 1005 | |
| 1006 | capture_payload_size = (uint32_t) hit->capture_payload.size; |
| 1007 | ret = lttng_dynamic_buffer_append(&payload->buffer, &capture_payload_size, |
| 1008 | sizeof(capture_payload_size)); |
| 1009 | if (ret) { |
| 1010 | goto end; |
| 1011 | } |
| 1012 | |
| 1013 | ret = lttng_dynamic_buffer_append(&payload->buffer, hit->capture_payload.data, |
| 1014 | hit->capture_payload.size); |
| 1015 | if (ret) { |
| 1016 | goto end; |
| 1017 | } |
| 1018 | |
| 1019 | end: |
| 1020 | return ret; |
| 1021 | } |
| 1022 | |
| 1023 | static |
| 1024 | bool msgpack_str_is_equal(const struct msgpack_object *obj, const char *str) |
| 1025 | { |
| 1026 | bool is_equal = true; |
| 1027 | |
| 1028 | assert(obj->type == MSGPACK_OBJECT_STR); |
| 1029 | |
| 1030 | if (obj->via.str.size != strlen(str)) { |
| 1031 | is_equal = false; |
| 1032 | goto end; |
| 1033 | } |
| 1034 | |
| 1035 | if (strncmp(obj->via.str.ptr, str, obj->via.str.size) != 0) { |
| 1036 | is_equal = false; |
| 1037 | goto end; |
| 1038 | } |
| 1039 | |
| 1040 | end: |
| 1041 | return is_equal; |
| 1042 | } |
| 1043 | |
| 1044 | static |
| 1045 | const msgpack_object *get_msgpack_map_obj(const struct msgpack_object *map_obj, |
| 1046 | const char *name) |
| 1047 | { |
| 1048 | const msgpack_object *ret = NULL; |
| 1049 | size_t i; |
| 1050 | |
| 1051 | assert(map_obj->type == MSGPACK_OBJECT_MAP); |
| 1052 | |
| 1053 | for (i = 0; i < map_obj->via.map.size; i++) { |
| 1054 | const struct msgpack_object_kv *kv = &map_obj->via.map.ptr[i]; |
| 1055 | |
| 1056 | assert(kv->key.type == MSGPACK_OBJECT_STR); |
| 1057 | |
| 1058 | if (msgpack_str_is_equal(&kv->key, name)) { |
| 1059 | ret = &kv->val; |
| 1060 | goto end; |
| 1061 | } |
| 1062 | } |
| 1063 | |
| 1064 | end: |
| 1065 | return ret; |
| 1066 | } |
| 1067 | |
| 1068 | static void lttng_evaluation_event_rule_destroy( |
| 1069 | struct lttng_evaluation *evaluation) |
| 1070 | { |
| 1071 | struct lttng_evaluation_event_rule *hit; |
| 1072 | |
| 1073 | hit = container_of( |
| 1074 | evaluation, struct lttng_evaluation_event_rule, parent); |
| 1075 | free(hit->name); |
| 1076 | lttng_dynamic_buffer_reset(&hit->capture_payload); |
| 1077 | lttng_event_field_value_destroy(hit->captured_values); |
| 1078 | free(hit); |
| 1079 | } |
| 1080 | |
| 1081 | static |
| 1082 | int event_field_value_from_obj(const msgpack_object *obj, |
| 1083 | struct lttng_event_field_value **field_val) |
| 1084 | { |
| 1085 | int ret = 0; |
| 1086 | |
| 1087 | assert(obj); |
| 1088 | assert(field_val); |
| 1089 | |
| 1090 | switch (obj->type) { |
| 1091 | case MSGPACK_OBJECT_NIL: |
| 1092 | /* Unavailable. */ |
| 1093 | *field_val = NULL; |
| 1094 | goto end; |
| 1095 | case MSGPACK_OBJECT_POSITIVE_INTEGER: |
| 1096 | *field_val = lttng_event_field_value_uint_create( |
| 1097 | obj->via.u64); |
| 1098 | break; |
| 1099 | case MSGPACK_OBJECT_NEGATIVE_INTEGER: |
| 1100 | *field_val = lttng_event_field_value_int_create( |
| 1101 | obj->via.i64); |
| 1102 | break; |
| 1103 | case MSGPACK_OBJECT_FLOAT32: |
| 1104 | case MSGPACK_OBJECT_FLOAT64: |
| 1105 | *field_val = lttng_event_field_value_real_create( |
| 1106 | obj->via.f64); |
| 1107 | break; |
| 1108 | case MSGPACK_OBJECT_STR: |
| 1109 | *field_val = lttng_event_field_value_string_create_with_size( |
| 1110 | obj->via.str.ptr, obj->via.str.size); |
| 1111 | break; |
| 1112 | case MSGPACK_OBJECT_ARRAY: |
| 1113 | { |
| 1114 | size_t i; |
| 1115 | |
| 1116 | *field_val = lttng_event_field_value_array_create(); |
| 1117 | if (!*field_val) { |
| 1118 | goto error; |
| 1119 | } |
| 1120 | |
| 1121 | for (i = 0; i < obj->via.array.size; i++) { |
| 1122 | const msgpack_object *elem_obj = &obj->via.array.ptr[i]; |
| 1123 | struct lttng_event_field_value *elem_field_val; |
| 1124 | |
| 1125 | ret = event_field_value_from_obj(elem_obj, |
| 1126 | &elem_field_val); |
| 1127 | if (ret) { |
| 1128 | goto error; |
| 1129 | } |
| 1130 | |
| 1131 | if (elem_field_val) { |
| 1132 | ret = lttng_event_field_value_array_append( |
| 1133 | *field_val, elem_field_val); |
| 1134 | } else { |
| 1135 | ret = lttng_event_field_value_array_append_unavailable( |
| 1136 | *field_val); |
| 1137 | } |
| 1138 | |
| 1139 | if (ret) { |
| 1140 | lttng_event_field_value_destroy(elem_field_val); |
| 1141 | goto error; |
| 1142 | } |
| 1143 | } |
| 1144 | |
| 1145 | break; |
| 1146 | } |
| 1147 | case MSGPACK_OBJECT_MAP: |
| 1148 | { |
| 1149 | /* |
| 1150 | * As of this version, the only valid map object is |
| 1151 | * for an enumeration value, for example: |
| 1152 | * |
| 1153 | * type: enum |
| 1154 | * value: 177 |
| 1155 | * labels: |
| 1156 | * - Labatt 50 |
| 1157 | * - Molson Dry |
| 1158 | * - Carling Black Label |
| 1159 | */ |
| 1160 | const msgpack_object *inner_obj; |
| 1161 | size_t label_i; |
| 1162 | |
| 1163 | inner_obj = get_msgpack_map_obj(obj, "type"); |
| 1164 | if (!inner_obj) { |
| 1165 | ERR("Missing `type` entry in map object."); |
| 1166 | goto error; |
| 1167 | } |
| 1168 | |
| 1169 | if (inner_obj->type != MSGPACK_OBJECT_STR) { |
| 1170 | ERR("Map object's `type` entry is not a string (it's a %d).", |
| 1171 | inner_obj->type); |
| 1172 | goto error; |
| 1173 | } |
| 1174 | |
| 1175 | if (!msgpack_str_is_equal(inner_obj, "enum")) { |
| 1176 | ERR("Map object's `type` entry: expecting `enum`."); |
| 1177 | goto error; |
| 1178 | } |
| 1179 | |
| 1180 | inner_obj = get_msgpack_map_obj(obj, "value"); |
| 1181 | if (!inner_obj) { |
| 1182 | ERR("Missing `value` entry in map object."); |
| 1183 | goto error; |
| 1184 | } |
| 1185 | |
| 1186 | if (inner_obj->type == MSGPACK_OBJECT_POSITIVE_INTEGER) { |
| 1187 | *field_val = lttng_event_field_value_enum_uint_create( |
| 1188 | inner_obj->via.u64); |
| 1189 | } else if (inner_obj->type == MSGPACK_OBJECT_NEGATIVE_INTEGER) { |
| 1190 | *field_val = lttng_event_field_value_enum_int_create( |
| 1191 | inner_obj->via.i64); |
| 1192 | } else { |
| 1193 | ERR("Map object's `value` entry is not an integer (it's a %d).", |
| 1194 | inner_obj->type); |
| 1195 | goto error; |
| 1196 | } |
| 1197 | |
| 1198 | if (!*field_val) { |
| 1199 | goto error; |
| 1200 | } |
| 1201 | |
| 1202 | inner_obj = get_msgpack_map_obj(obj, "labels"); |
| 1203 | if (!inner_obj) { |
| 1204 | /* No labels */ |
| 1205 | goto end; |
| 1206 | } |
| 1207 | |
| 1208 | if (inner_obj->type != MSGPACK_OBJECT_ARRAY) { |
| 1209 | ERR("Map object's `labels` entry is not an array (it's a %d).", |
| 1210 | inner_obj->type); |
| 1211 | goto error; |
| 1212 | } |
| 1213 | |
| 1214 | for (label_i = 0; label_i < inner_obj->via.array.size; |
| 1215 | label_i++) { |
| 1216 | int iret; |
| 1217 | const msgpack_object *elem_obj = |
| 1218 | &inner_obj->via.array.ptr[label_i]; |
| 1219 | |
| 1220 | if (elem_obj->type != MSGPACK_OBJECT_STR) { |
| 1221 | ERR("Map object's `labels` entry's type is not a string (it's a %d).", |
| 1222 | elem_obj->type); |
| 1223 | goto error; |
| 1224 | } |
| 1225 | |
| 1226 | iret = lttng_event_field_value_enum_append_label_with_size( |
| 1227 | *field_val, elem_obj->via.str.ptr, |
| 1228 | elem_obj->via.str.size); |
| 1229 | if (iret) { |
| 1230 | goto error; |
| 1231 | } |
| 1232 | } |
| 1233 | |
| 1234 | break; |
| 1235 | } |
| 1236 | default: |
| 1237 | ERR("Unexpected object type %d.", obj->type); |
| 1238 | goto error; |
| 1239 | } |
| 1240 | |
| 1241 | if (!*field_val) { |
| 1242 | goto error; |
| 1243 | } |
| 1244 | |
| 1245 | goto end; |
| 1246 | |
| 1247 | error: |
| 1248 | lttng_event_field_value_destroy(*field_val); |
| 1249 | *field_val = NULL; |
| 1250 | ret = -1; |
| 1251 | |
| 1252 | end: |
| 1253 | return ret; |
| 1254 | } |
| 1255 | |
| 1256 | static |
| 1257 | struct lttng_event_field_value *event_field_value_from_capture_payload( |
| 1258 | const struct lttng_condition_on_event *condition, |
| 1259 | const char *capture_payload, size_t capture_payload_size) |
| 1260 | { |
| 1261 | struct lttng_event_field_value *ret = NULL; |
| 1262 | msgpack_unpacked unpacked; |
| 1263 | msgpack_unpack_return unpack_return; |
| 1264 | const msgpack_object *root_obj; |
| 1265 | const msgpack_object_array *root_array_obj; |
| 1266 | size_t i; |
| 1267 | size_t count; |
| 1268 | |
| 1269 | assert(condition); |
| 1270 | assert(capture_payload); |
| 1271 | |
| 1272 | /* Initialize value. */ |
| 1273 | msgpack_unpacked_init(&unpacked); |
| 1274 | |
| 1275 | /* Decode. */ |
| 1276 | unpack_return = msgpack_unpack_next(&unpacked, capture_payload, |
| 1277 | capture_payload_size, NULL); |
| 1278 | if (unpack_return != MSGPACK_UNPACK_SUCCESS) { |
| 1279 | ERR("msgpack_unpack_next() failed to decode the " |
| 1280 | "MessagePack-encoded capture payload " |
| 1281 | "(size %zu); returned %d.", |
| 1282 | capture_payload_size, unpack_return); |
| 1283 | goto error; |
| 1284 | } |
| 1285 | |
| 1286 | /* Get root array. */ |
| 1287 | root_obj = &unpacked.data; |
| 1288 | |
| 1289 | if (root_obj->type != MSGPACK_OBJECT_ARRAY) { |
| 1290 | ERR("Expecting an array as the root object; got type %d.", |
| 1291 | root_obj->type); |
| 1292 | goto error; |
| 1293 | } |
| 1294 | |
| 1295 | root_array_obj = &root_obj->via.array; |
| 1296 | |
| 1297 | /* Create an empty root array event field value. */ |
| 1298 | ret = lttng_event_field_value_array_create(); |
| 1299 | if (!ret) { |
| 1300 | goto error; |
| 1301 | } |
| 1302 | |
| 1303 | /* |
| 1304 | * For each capture descriptor in the condition object: |
| 1305 | * |
| 1306 | * 1. Get its corresponding captured field value MessagePack |
| 1307 | * object. |
| 1308 | * |
| 1309 | * 2. Create a corresponding event field value. |
| 1310 | * |
| 1311 | * 3. Append it to `ret` (the root array event field value). |
| 1312 | */ |
| 1313 | count = lttng_dynamic_pointer_array_get_count( |
| 1314 | &condition->capture_descriptors); |
| 1315 | assert(count > 0); |
| 1316 | |
| 1317 | for (i = 0; i < count; i++) { |
| 1318 | const struct lttng_capture_descriptor *capture_descriptor = |
| 1319 | lttng_condition_on_event_get_internal_capture_descriptor_at_index( |
| 1320 | &condition->parent, i); |
| 1321 | const msgpack_object *elem_obj; |
| 1322 | struct lttng_event_field_value *elem_field_val; |
| 1323 | int iret; |
| 1324 | |
| 1325 | assert(capture_descriptor); |
| 1326 | |
| 1327 | elem_obj = &root_array_obj->ptr[i]; |
| 1328 | iret = event_field_value_from_obj(elem_obj, |
| 1329 | &elem_field_val); |
| 1330 | if (iret) { |
| 1331 | goto error; |
| 1332 | } |
| 1333 | |
| 1334 | if (elem_field_val) { |
| 1335 | iret = lttng_event_field_value_array_append(ret, |
| 1336 | elem_field_val); |
| 1337 | } else { |
| 1338 | iret = lttng_event_field_value_array_append_unavailable( |
| 1339 | ret); |
| 1340 | } |
| 1341 | |
| 1342 | if (iret) { |
| 1343 | lttng_event_field_value_destroy(elem_field_val); |
| 1344 | goto error; |
| 1345 | } |
| 1346 | } |
| 1347 | |
| 1348 | goto end; |
| 1349 | |
| 1350 | error: |
| 1351 | lttng_event_field_value_destroy(ret); |
| 1352 | ret = NULL; |
| 1353 | |
| 1354 | end: |
| 1355 | msgpack_unpacked_destroy(&unpacked); |
| 1356 | return ret; |
| 1357 | } |
| 1358 | |
| 1359 | LTTNG_HIDDEN |
| 1360 | struct lttng_evaluation *lttng_evaluation_event_rule_create( |
| 1361 | const struct lttng_condition_on_event *condition, |
| 1362 | const char *trigger_name, |
| 1363 | const char *capture_payload, size_t capture_payload_size, |
| 1364 | bool decode_capture_payload) |
| 1365 | { |
| 1366 | struct lttng_evaluation_event_rule *hit; |
| 1367 | struct lttng_evaluation *evaluation = NULL; |
| 1368 | |
| 1369 | hit = zmalloc(sizeof(struct lttng_evaluation_event_rule)); |
| 1370 | if (!hit) { |
| 1371 | goto error; |
| 1372 | } |
| 1373 | |
| 1374 | hit->name = strdup(trigger_name); |
| 1375 | if (!hit->name) { |
| 1376 | goto error; |
| 1377 | } |
| 1378 | |
| 1379 | lttng_dynamic_buffer_init(&hit->capture_payload); |
| 1380 | |
| 1381 | if (capture_payload) { |
| 1382 | const int ret = lttng_dynamic_buffer_append( |
| 1383 | &hit->capture_payload, capture_payload, |
| 1384 | capture_payload_size); |
| 1385 | if (ret) { |
| 1386 | ERR("Failed to initialize capture payload of event rule evaluation"); |
| 1387 | goto error; |
| 1388 | } |
| 1389 | |
| 1390 | if (decode_capture_payload) { |
| 1391 | hit->captured_values = |
| 1392 | event_field_value_from_capture_payload( |
| 1393 | condition, |
| 1394 | capture_payload, |
| 1395 | capture_payload_size); |
| 1396 | if (!hit->captured_values) { |
| 1397 | ERR("Failed to decode the capture payload: size = %zu", |
| 1398 | capture_payload_size); |
| 1399 | goto error; |
| 1400 | } |
| 1401 | } |
| 1402 | } |
| 1403 | |
| 1404 | hit->parent.type = LTTNG_CONDITION_TYPE_ON_EVENT; |
| 1405 | hit->parent.serialize = lttng_evaluation_event_rule_serialize; |
| 1406 | hit->parent.destroy = lttng_evaluation_event_rule_destroy; |
| 1407 | |
| 1408 | evaluation = &hit->parent; |
| 1409 | hit = NULL; |
| 1410 | |
| 1411 | error: |
| 1412 | if (hit) { |
| 1413 | lttng_evaluation_event_rule_destroy(&hit->parent); |
| 1414 | } |
| 1415 | |
| 1416 | return evaluation; |
| 1417 | } |
| 1418 | |
| 1419 | enum lttng_evaluation_status lttng_evaluation_get_captured_values( |
| 1420 | const struct lttng_evaluation *evaluation, |
| 1421 | const struct lttng_event_field_value **field_val) |
| 1422 | { |
| 1423 | struct lttng_evaluation_event_rule *hit; |
| 1424 | enum lttng_evaluation_status status = LTTNG_EVALUATION_STATUS_OK; |
| 1425 | |
| 1426 | /* |
| 1427 | * Event rule is currently the only type that can provide captured |
| 1428 | * values. |
| 1429 | */ |
| 1430 | if (!evaluation || !is_event_rule_evaluation(evaluation) || |
| 1431 | !field_val) { |
| 1432 | status = LTTNG_EVALUATION_STATUS_INVALID; |
| 1433 | goto end; |
| 1434 | } |
| 1435 | |
| 1436 | hit = container_of(evaluation, struct lttng_evaluation_event_rule, |
| 1437 | parent); |
| 1438 | if (!hit->captured_values) { |
| 1439 | status = LTTNG_EVALUATION_STATUS_INVALID; |
| 1440 | goto end; |
| 1441 | } |
| 1442 | |
| 1443 | *field_val = hit->captured_values; |
| 1444 | |
| 1445 | end: |
| 1446 | return status; |
| 1447 | } |
| 1448 | |
| 1449 | enum lttng_evaluation_status lttng_evaluation_event_rule_get_trigger_name( |
| 1450 | const struct lttng_evaluation *evaluation, const char **name) |
| 1451 | { |
| 1452 | struct lttng_evaluation_event_rule *hit; |
| 1453 | enum lttng_evaluation_status status = LTTNG_EVALUATION_STATUS_OK; |
| 1454 | |
| 1455 | if (!evaluation || !is_event_rule_evaluation(evaluation) || !name) { |
| 1456 | status = LTTNG_EVALUATION_STATUS_INVALID; |
| 1457 | goto end; |
| 1458 | } |
| 1459 | |
| 1460 | hit = container_of( |
| 1461 | evaluation, struct lttng_evaluation_event_rule, parent); |
| 1462 | *name = hit->name; |
| 1463 | end: |
| 1464 | return status; |
| 1465 | } |
| 1466 | |
| 1467 | LTTNG_HIDDEN |
| 1468 | enum lttng_error_code |
| 1469 | lttng_condition_on_event_generate_capture_descriptor_bytecode( |
| 1470 | struct lttng_condition *condition) |
| 1471 | { |
| 1472 | enum lttng_error_code ret; |
| 1473 | enum lttng_condition_status status; |
| 1474 | unsigned int capture_count, i; |
| 1475 | |
| 1476 | if (!condition || !IS_EVENT_RULE_CONDITION(condition)) { |
| 1477 | ret = LTTNG_ERR_FATAL; |
| 1478 | goto end; |
| 1479 | } |
| 1480 | |
| 1481 | status = lttng_condition_on_event_get_capture_descriptor_count( |
| 1482 | condition, &capture_count); |
| 1483 | if (status != LTTNG_CONDITION_STATUS_OK) { |
| 1484 | ret = LTTNG_ERR_FATAL; |
| 1485 | goto end; |
| 1486 | } |
| 1487 | |
| 1488 | for (i = 0; i < capture_count; i++) { |
| 1489 | struct lttng_capture_descriptor *local_capture_desc = |
| 1490 | lttng_condition_on_event_get_internal_capture_descriptor_at_index( |
| 1491 | condition, i); |
| 1492 | |
| 1493 | if (local_capture_desc == NULL) { |
| 1494 | ret = LTTNG_ERR_FATAL; |
| 1495 | goto end; |
| 1496 | } |
| 1497 | |
| 1498 | /* Generate the bytecode. */ |
| 1499 | status = lttng_event_expr_to_bytecode( |
| 1500 | local_capture_desc->event_expression, |
| 1501 | &local_capture_desc->bytecode); |
| 1502 | if (status < 0 || local_capture_desc->bytecode == NULL) { |
| 1503 | ret = LTTNG_ERR_INVALID_CAPTURE_EXPRESSION; |
| 1504 | goto end; |
| 1505 | } |
| 1506 | } |
| 1507 | |
| 1508 | /* Everything went better than expected */ |
| 1509 | ret = LTTNG_OK; |
| 1510 | |
| 1511 | end: |
| 1512 | return ret; |
| 1513 | } |
| 1514 | |
| 1515 | LTTNG_HIDDEN |
| 1516 | const struct lttng_bytecode * |
| 1517 | lttng_condition_on_event_get_capture_bytecode_at_index( |
| 1518 | const struct lttng_condition *condition, unsigned int index) |
| 1519 | { |
| 1520 | const struct lttng_condition_on_event *on_event_cond = |
| 1521 | container_of(condition, |
| 1522 | const struct lttng_condition_on_event, |
| 1523 | parent); |
| 1524 | struct lttng_capture_descriptor *desc = NULL; |
| 1525 | struct lttng_bytecode *bytecode = NULL; |
| 1526 | unsigned int count; |
| 1527 | enum lttng_condition_status status; |
| 1528 | |
| 1529 | if (!condition || !IS_EVENT_RULE_CONDITION(condition)) { |
| 1530 | goto end; |
| 1531 | } |
| 1532 | |
| 1533 | status = lttng_condition_on_event_get_capture_descriptor_count( |
| 1534 | condition, &count); |
| 1535 | if (status != LTTNG_CONDITION_STATUS_OK) { |
| 1536 | goto end; |
| 1537 | } |
| 1538 | |
| 1539 | if (index >= count) { |
| 1540 | goto end; |
| 1541 | } |
| 1542 | |
| 1543 | desc = lttng_dynamic_pointer_array_get_pointer( |
| 1544 | &on_event_cond->capture_descriptors, index); |
| 1545 | if (desc == NULL) { |
| 1546 | goto end; |
| 1547 | } |
| 1548 | |
| 1549 | bytecode = desc->bytecode; |
| 1550 | end: |
| 1551 | return bytecode; |
| 1552 | } |