| 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/event-rule-internal.h> |
| 16 | #include <lttng/condition/event-rule.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_EVENT_RULE_HIT) |
| 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_EVENT_RULE_HIT; |
| 35 | } |
| 36 | |
| 37 | static bool lttng_condition_event_rule_validate( |
| 38 | const struct lttng_condition *condition); |
| 39 | static int lttng_condition_event_rule_serialize( |
| 40 | const struct lttng_condition *condition, |
| 41 | struct lttng_payload *payload); |
| 42 | static bool lttng_condition_event_rule_is_equal( |
| 43 | const struct lttng_condition *_a, |
| 44 | const struct lttng_condition *_b); |
| 45 | static void lttng_condition_event_rule_destroy( |
| 46 | struct lttng_condition *condition); |
| 47 | |
| 48 | static bool lttng_condition_event_rule_validate( |
| 49 | const struct lttng_condition *condition) |
| 50 | { |
| 51 | bool valid = false; |
| 52 | struct lttng_condition_event_rule *event_rule; |
| 53 | |
| 54 | if (!condition) { |
| 55 | goto end; |
| 56 | } |
| 57 | |
| 58 | event_rule = container_of( |
| 59 | condition, struct lttng_condition_event_rule, parent); |
| 60 | if (!event_rule->rule) { |
| 61 | ERR("Invalid session 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 character. |
| 75 | */ |
| 76 | static |
| 77 | int serialize_cstr(const char *str, struct lttng_dynamic_buffer *buf) |
| 78 | { |
| 79 | int ret; |
| 80 | uint32_t len = strlen(str) + 1; |
| 81 | |
| 82 | /* Serialize the length, including the null character */ |
| 83 | DBG("Serializing C string's length (including null character): " |
| 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 | uint8_t type; |
| 109 | int ret; |
| 110 | |
| 111 | /* Serialize the expression's type */ |
| 112 | DBG("Serializing event expression's type: %d", expr->type); |
| 113 | type = expr->type; |
| 114 | ret = lttng_dynamic_buffer_append(&payload->buffer, &type, sizeof(type)); |
| 115 | if (ret) { |
| 116 | goto end; |
| 117 | } |
| 118 | |
| 119 | /* Serialize the expression */ |
| 120 | switch (expr->type) { |
| 121 | case LTTNG_EVENT_EXPR_TYPE_EVENT_PAYLOAD_FIELD: |
| 122 | case LTTNG_EVENT_EXPR_TYPE_CHANNEL_CONTEXT_FIELD: |
| 123 | { |
| 124 | const struct lttng_event_expr_field *field_expr = |
| 125 | container_of(expr, |
| 126 | const struct lttng_event_expr_field, |
| 127 | parent); |
| 128 | |
| 129 | /* Serialize the field name */ |
| 130 | DBG("Serializing field event expression's field name: \"%s\"", |
| 131 | field_expr->name); |
| 132 | ret = serialize_cstr(field_expr->name, &payload->buffer); |
| 133 | if (ret) { |
| 134 | goto end; |
| 135 | } |
| 136 | |
| 137 | break; |
| 138 | } |
| 139 | case LTTNG_EVENT_EXPR_TYPE_APP_SPECIFIC_CONTEXT_FIELD: |
| 140 | { |
| 141 | const struct lttng_event_expr_app_specific_context_field *field_expr = |
| 142 | container_of(expr, |
| 143 | const struct lttng_event_expr_app_specific_context_field, |
| 144 | parent); |
| 145 | |
| 146 | /* Serialize the provider name */ |
| 147 | DBG("Serializing app-specific context field event expression's " |
| 148 | "provider name: \"%s\"", |
| 149 | field_expr->provider_name); |
| 150 | ret = serialize_cstr(field_expr->provider_name, &payload->buffer); |
| 151 | if (ret) { |
| 152 | goto end; |
| 153 | } |
| 154 | |
| 155 | /* Serialize the type name */ |
| 156 | DBG("Serializing app-specific context field event expression's " |
| 157 | "type name: \"%s\"", |
| 158 | field_expr->provider_name); |
| 159 | ret = serialize_cstr(field_expr->type_name, &payload->buffer); |
| 160 | if (ret) { |
| 161 | goto end; |
| 162 | } |
| 163 | |
| 164 | break; |
| 165 | } |
| 166 | case LTTNG_EVENT_EXPR_TYPE_ARRAY_FIELD_ELEMENT: |
| 167 | { |
| 168 | const struct lttng_event_expr_array_field_element *elem_expr = |
| 169 | container_of(expr, |
| 170 | const struct lttng_event_expr_array_field_element, |
| 171 | parent); |
| 172 | uint32_t index = elem_expr->index; |
| 173 | |
| 174 | /* Serialize the index */ |
| 175 | DBG("Serializing array field element event expression's " |
| 176 | "index: %u", elem_expr->index); |
| 177 | ret = lttng_dynamic_buffer_append(&payload->buffer, &index, sizeof(index)); |
| 178 | if (ret) { |
| 179 | goto end; |
| 180 | } |
| 181 | |
| 182 | /* Serialize the parent array field expression */ |
| 183 | DBG("Serializing array field element event expression's " |
| 184 | "parent array field event expression."); |
| 185 | ret = serialize_event_expr(elem_expr->array_field_expr, payload); |
| 186 | if (ret) { |
| 187 | goto end; |
| 188 | } |
| 189 | |
| 190 | break; |
| 191 | } |
| 192 | default: |
| 193 | break; |
| 194 | } |
| 195 | |
| 196 | end: |
| 197 | return ret; |
| 198 | } |
| 199 | |
| 200 | LTTNG_HIDDEN |
| 201 | struct lttng_capture_descriptor * |
| 202 | lttng_condition_event_rule_get_internal_capture_descriptor_at_index( |
| 203 | const struct lttng_condition *condition, unsigned int index) |
| 204 | { |
| 205 | const struct lttng_condition_event_rule *event_rule_cond = |
| 206 | container_of(condition, |
| 207 | const struct lttng_condition_event_rule, |
| 208 | parent); |
| 209 | struct lttng_capture_descriptor *desc = NULL; |
| 210 | unsigned int count; |
| 211 | enum lttng_condition_status status; |
| 212 | |
| 213 | if (!condition || !IS_EVENT_RULE_CONDITION(condition)) { |
| 214 | goto end; |
| 215 | } |
| 216 | |
| 217 | status = lttng_condition_event_rule_get_capture_descriptor_count( |
| 218 | condition, &count); |
| 219 | if (status != LTTNG_CONDITION_STATUS_OK) { |
| 220 | goto end; |
| 221 | } |
| 222 | |
| 223 | if (index >= count) { |
| 224 | goto end; |
| 225 | } |
| 226 | |
| 227 | desc = lttng_dynamic_pointer_array_get_pointer( |
| 228 | &event_rule_cond->capture_descriptors, index); |
| 229 | end: |
| 230 | return desc; |
| 231 | } |
| 232 | |
| 233 | static int lttng_condition_event_rule_serialize( |
| 234 | const struct lttng_condition *condition, |
| 235 | struct lttng_payload *payload) |
| 236 | { |
| 237 | int ret; |
| 238 | struct lttng_condition_event_rule *event_rule; |
| 239 | enum lttng_condition_status status; |
| 240 | uint32_t capture_descr_count; |
| 241 | uint32_t i; |
| 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_event_rule, 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 | status = lttng_condition_event_rule_get_capture_descriptor_count( |
| 259 | condition, &capture_descr_count); |
| 260 | if (status != LTTNG_CONDITION_STATUS_OK) { |
| 261 | ret = -1; |
| 262 | goto end; |
| 263 | }; |
| 264 | |
| 265 | DBG("Serializing event rule condition's capture descriptor count: %" PRIu32, |
| 266 | capture_descr_count); |
| 267 | ret = lttng_dynamic_buffer_append(&payload->buffer, &capture_descr_count, |
| 268 | sizeof(capture_descr_count)); |
| 269 | if (ret) { |
| 270 | goto end; |
| 271 | } |
| 272 | |
| 273 | for (i = 0; i < capture_descr_count; i++) { |
| 274 | const struct lttng_capture_descriptor *desc = |
| 275 | lttng_condition_event_rule_get_internal_capture_descriptor_at_index( |
| 276 | condition, i); |
| 277 | |
| 278 | DBG("Serializing event rule condition's capture descriptor %" PRIu32, |
| 279 | i); |
| 280 | ret = serialize_event_expr(desc->event_expression, payload); |
| 281 | if (ret) { |
| 282 | goto end; |
| 283 | } |
| 284 | |
| 285 | /* |
| 286 | * Appending the internal index payload linked with the |
| 287 | * descriptor. |
| 288 | * TODO: might want to move to an englobing object to describe a |
| 289 | * capture descriptor publicly. |
| 290 | */ |
| 291 | ret = lttng_dynamic_buffer_append(&payload->buffer, &desc->capture_index, |
| 292 | sizeof(desc->capture_index)); |
| 293 | if (ret) { |
| 294 | goto end; |
| 295 | } |
| 296 | } |
| 297 | |
| 298 | end: |
| 299 | return ret; |
| 300 | } |
| 301 | |
| 302 | static |
| 303 | bool capture_descriptors_are_equal( |
| 304 | const struct lttng_condition *condition_a, |
| 305 | const struct lttng_condition *condition_b) |
| 306 | { |
| 307 | bool is_equal = true; |
| 308 | unsigned int capture_descr_count_a; |
| 309 | unsigned int capture_descr_count_b; |
| 310 | size_t i; |
| 311 | enum lttng_condition_status status; |
| 312 | |
| 313 | status = lttng_condition_event_rule_get_capture_descriptor_count( |
| 314 | condition_a, &capture_descr_count_a); |
| 315 | if (status != LTTNG_CONDITION_STATUS_OK) { |
| 316 | goto not_equal; |
| 317 | } |
| 318 | |
| 319 | status = lttng_condition_event_rule_get_capture_descriptor_count( |
| 320 | condition_b, &capture_descr_count_b); |
| 321 | if (status != LTTNG_CONDITION_STATUS_OK) { |
| 322 | goto not_equal; |
| 323 | } |
| 324 | |
| 325 | if (capture_descr_count_a != capture_descr_count_b) { |
| 326 | goto not_equal; |
| 327 | } |
| 328 | |
| 329 | for (i = 0; i < capture_descr_count_a; i++) { |
| 330 | const struct lttng_event_expr *expr_a = |
| 331 | lttng_condition_event_rule_get_capture_descriptor_at_index( |
| 332 | condition_a, |
| 333 | i); |
| 334 | const struct lttng_event_expr *expr_b = |
| 335 | lttng_condition_event_rule_get_capture_descriptor_at_index( |
| 336 | condition_b, |
| 337 | i); |
| 338 | |
| 339 | if (!lttng_event_expr_is_equal(expr_a, expr_b)) { |
| 340 | goto not_equal; |
| 341 | } |
| 342 | } |
| 343 | |
| 344 | goto end; |
| 345 | |
| 346 | not_equal: |
| 347 | is_equal = false; |
| 348 | |
| 349 | end: |
| 350 | return is_equal; |
| 351 | } |
| 352 | |
| 353 | static bool lttng_condition_event_rule_is_equal( |
| 354 | const struct lttng_condition *_a, |
| 355 | const struct lttng_condition *_b) |
| 356 | { |
| 357 | bool is_equal = false; |
| 358 | struct lttng_condition_event_rule *a, *b; |
| 359 | |
| 360 | a = container_of(_a, struct lttng_condition_event_rule, parent); |
| 361 | b = container_of(_b, struct lttng_condition_event_rule, parent); |
| 362 | |
| 363 | /* Both session names must be set or both must be unset. */ |
| 364 | if ((a->rule && !b->rule) || (!a->rule && b->rule)) { |
| 365 | WARN("Comparing session event_rule conditions with uninitialized rule."); |
| 366 | goto end; |
| 367 | } |
| 368 | |
| 369 | is_equal = lttng_event_rule_is_equal(a->rule, b->rule); |
| 370 | if (!is_equal) { |
| 371 | goto end; |
| 372 | } |
| 373 | |
| 374 | is_equal = capture_descriptors_are_equal(_a, _b); |
| 375 | |
| 376 | end: |
| 377 | return is_equal; |
| 378 | } |
| 379 | |
| 380 | static void lttng_condition_event_rule_destroy( |
| 381 | struct lttng_condition *condition) |
| 382 | { |
| 383 | struct lttng_condition_event_rule *event_rule; |
| 384 | |
| 385 | event_rule = container_of( |
| 386 | condition, struct lttng_condition_event_rule, parent); |
| 387 | |
| 388 | lttng_event_rule_destroy(event_rule->rule); |
| 389 | lttng_dynamic_pointer_array_reset(&event_rule->capture_descriptors); |
| 390 | free(event_rule); |
| 391 | } |
| 392 | |
| 393 | static |
| 394 | void destroy_capture_descriptor(void *ptr) |
| 395 | { |
| 396 | struct lttng_capture_descriptor *desc = |
| 397 | (struct lttng_capture_descriptor *) ptr; |
| 398 | lttng_event_expr_destroy(desc->event_expression); |
| 399 | free(desc); |
| 400 | } |
| 401 | |
| 402 | struct lttng_condition *lttng_condition_event_rule_create( |
| 403 | struct lttng_event_rule *rule) |
| 404 | { |
| 405 | struct lttng_condition *parent = NULL; |
| 406 | struct lttng_condition_event_rule *condition = NULL; |
| 407 | |
| 408 | if (!rule) { |
| 409 | goto end; |
| 410 | } |
| 411 | |
| 412 | condition = zmalloc(sizeof(struct lttng_condition_event_rule)); |
| 413 | if (!condition) { |
| 414 | return NULL; |
| 415 | } |
| 416 | |
| 417 | lttng_condition_init(&condition->parent, |
| 418 | LTTNG_CONDITION_TYPE_EVENT_RULE_HIT); |
| 419 | condition->parent.validate = lttng_condition_event_rule_validate, |
| 420 | condition->parent.serialize = lttng_condition_event_rule_serialize, |
| 421 | condition->parent.equal = lttng_condition_event_rule_is_equal, |
| 422 | condition->parent.destroy = lttng_condition_event_rule_destroy, |
| 423 | |
| 424 | lttng_event_rule_get(rule); |
| 425 | |
| 426 | condition->rule = rule; |
| 427 | lttng_dynamic_pointer_array_init(&condition->capture_descriptors, |
| 428 | destroy_capture_descriptor); |
| 429 | |
| 430 | parent = &condition->parent; |
| 431 | end: |
| 432 | return parent; |
| 433 | } |
| 434 | |
| 435 | static |
| 436 | int64_t int_from_buffer(const struct lttng_buffer_view *view, size_t size, |
| 437 | size_t *offset) |
| 438 | { |
| 439 | int64_t ret; |
| 440 | |
| 441 | if (*offset + size > view->size) { |
| 442 | ret = -1; |
| 443 | goto end; |
| 444 | } |
| 445 | |
| 446 | switch (size) { |
| 447 | case 1: |
| 448 | ret = (int64_t) view->data[*offset]; |
| 449 | break; |
| 450 | case sizeof(int32_t): |
| 451 | { |
| 452 | int32_t s32; |
| 453 | |
| 454 | memcpy(&s32, &view->data[*offset], sizeof(s32)); |
| 455 | ret = (int64_t) s32; |
| 456 | break; |
| 457 | } |
| 458 | case sizeof(ret): |
| 459 | memcpy(&ret, &view->data[*offset], sizeof(ret)); |
| 460 | break; |
| 461 | default: |
| 462 | abort(); |
| 463 | } |
| 464 | |
| 465 | *offset += size; |
| 466 | |
| 467 | end: |
| 468 | return ret; |
| 469 | } |
| 470 | static |
| 471 | uint64_t uint_from_buffer(const struct lttng_buffer_view *view, size_t size, |
| 472 | size_t *offset) |
| 473 | { |
| 474 | uint64_t ret; |
| 475 | |
| 476 | if (*offset + size > view->size) { |
| 477 | ret = UINT64_C(-1); |
| 478 | goto end; |
| 479 | } |
| 480 | |
| 481 | switch (size) { |
| 482 | case 1: |
| 483 | ret = (uint64_t) view->data[*offset]; |
| 484 | break; |
| 485 | case sizeof(uint32_t): |
| 486 | { |
| 487 | uint32_t u32; |
| 488 | |
| 489 | memcpy(&u32, &view->data[*offset], sizeof(u32)); |
| 490 | ret = (uint64_t) u32; |
| 491 | break; |
| 492 | } |
| 493 | case sizeof(ret): |
| 494 | memcpy(&ret, &view->data[*offset], sizeof(ret)); |
| 495 | break; |
| 496 | default: |
| 497 | abort(); |
| 498 | } |
| 499 | |
| 500 | *offset += size; |
| 501 | |
| 502 | end: |
| 503 | return ret; |
| 504 | } |
| 505 | |
| 506 | static |
| 507 | const char *str_from_buffer(const struct lttng_buffer_view *view, |
| 508 | size_t *offset) |
| 509 | { |
| 510 | uint64_t len; |
| 511 | const char *ret; |
| 512 | |
| 513 | len = uint_from_buffer(view, sizeof(uint32_t), offset); |
| 514 | if (len == UINT64_C(-1)) { |
| 515 | goto error; |
| 516 | } |
| 517 | |
| 518 | ret = &view->data[*offset]; |
| 519 | |
| 520 | if (!lttng_buffer_view_contains_string(view, ret, len)) { |
| 521 | goto error; |
| 522 | } |
| 523 | |
| 524 | *offset += len; |
| 525 | goto end; |
| 526 | |
| 527 | error: |
| 528 | ret = NULL; |
| 529 | |
| 530 | end: |
| 531 | return ret; |
| 532 | } |
| 533 | |
| 534 | static |
| 535 | struct lttng_event_expr *event_expr_from_payload( |
| 536 | struct lttng_payload_view *view, size_t *offset) |
| 537 | { |
| 538 | struct lttng_event_expr *expr = NULL; |
| 539 | const char *str; |
| 540 | uint64_t type; |
| 541 | |
| 542 | type = uint_from_buffer(&view->buffer, sizeof(uint8_t), offset); |
| 543 | if (type == UINT64_C(-1)) { |
| 544 | goto error; |
| 545 | } |
| 546 | |
| 547 | switch (type) { |
| 548 | case LTTNG_EVENT_EXPR_TYPE_EVENT_PAYLOAD_FIELD: |
| 549 | str = str_from_buffer(&view->buffer, offset); |
| 550 | if (!str) { |
| 551 | goto error; |
| 552 | } |
| 553 | |
| 554 | expr = lttng_event_expr_event_payload_field_create(str); |
| 555 | break; |
| 556 | case LTTNG_EVENT_EXPR_TYPE_CHANNEL_CONTEXT_FIELD: |
| 557 | str = str_from_buffer(&view->buffer, offset); |
| 558 | if (!str) { |
| 559 | goto error; |
| 560 | } |
| 561 | |
| 562 | expr = lttng_event_expr_channel_context_field_create(str); |
| 563 | break; |
| 564 | case LTTNG_EVENT_EXPR_TYPE_APP_SPECIFIC_CONTEXT_FIELD: |
| 565 | { |
| 566 | const char *provider_name; |
| 567 | const char *type_name; |
| 568 | |
| 569 | provider_name = str_from_buffer(&view->buffer, offset); |
| 570 | if (!provider_name) { |
| 571 | goto error; |
| 572 | } |
| 573 | |
| 574 | type_name = str_from_buffer(&view->buffer, offset); |
| 575 | if (!type_name) { |
| 576 | goto error; |
| 577 | } |
| 578 | |
| 579 | expr = lttng_event_expr_app_specific_context_field_create( |
| 580 | provider_name, type_name); |
| 581 | break; |
| 582 | } |
| 583 | case LTTNG_EVENT_EXPR_TYPE_ARRAY_FIELD_ELEMENT: |
| 584 | { |
| 585 | struct lttng_event_expr *array_field_expr; |
| 586 | uint64_t index; |
| 587 | |
| 588 | index = uint_from_buffer(&view->buffer, sizeof(uint32_t), offset); |
| 589 | if (index == UINT64_C(-1)) { |
| 590 | goto error; |
| 591 | } |
| 592 | |
| 593 | /* Array field expression is the encoded after this */ |
| 594 | array_field_expr = event_expr_from_payload(view, offset); |
| 595 | if (!array_field_expr) { |
| 596 | goto error; |
| 597 | } |
| 598 | |
| 599 | /* Move ownership of `array_field_expr` to new expression */ |
| 600 | expr = lttng_event_expr_array_field_element_create( |
| 601 | array_field_expr, (unsigned int) index); |
| 602 | if (!expr) { |
| 603 | /* `array_field_expr` not moved: destroy it */ |
| 604 | lttng_event_expr_destroy(array_field_expr); |
| 605 | } |
| 606 | |
| 607 | break; |
| 608 | } |
| 609 | default: |
| 610 | abort(); |
| 611 | } |
| 612 | |
| 613 | goto end; |
| 614 | |
| 615 | error: |
| 616 | lttng_event_expr_destroy(expr); |
| 617 | expr = NULL; |
| 618 | |
| 619 | end: |
| 620 | return expr; |
| 621 | } |
| 622 | |
| 623 | LTTNG_HIDDEN |
| 624 | ssize_t lttng_condition_event_rule_create_from_payload( |
| 625 | struct lttng_payload_view *view, |
| 626 | struct lttng_condition **_condition) |
| 627 | { |
| 628 | ssize_t consumed_length; |
| 629 | size_t offset = 0; |
| 630 | ssize_t size; |
| 631 | uint64_t capture_descr_count; |
| 632 | uint64_t i; |
| 633 | struct lttng_condition *condition = NULL; |
| 634 | struct lttng_event_rule *event_rule = NULL; |
| 635 | |
| 636 | if (!view || !_condition) { |
| 637 | goto error; |
| 638 | } |
| 639 | |
| 640 | /* Struct lttng_event_rule */ |
| 641 | { |
| 642 | struct lttng_payload_view event_rule_view = |
| 643 | lttng_payload_view_from_view(view, offset, -1); |
| 644 | size = lttng_event_rule_create_from_payload( |
| 645 | &event_rule_view, &event_rule); |
| 646 | } |
| 647 | |
| 648 | if (size < 0 || !event_rule) { |
| 649 | goto error; |
| 650 | } |
| 651 | |
| 652 | /* Create condition (no capture descriptors yet) at this point */ |
| 653 | condition = lttng_condition_event_rule_create(event_rule); |
| 654 | if (!condition) { |
| 655 | goto error; |
| 656 | } |
| 657 | |
| 658 | |
| 659 | /* Capture descriptor count */ |
| 660 | assert(size >= 0); |
| 661 | offset += (size_t) size; |
| 662 | capture_descr_count = uint_from_buffer(&view->buffer, sizeof(uint32_t), &offset); |
| 663 | if (capture_descr_count == UINT64_C(-1)) { |
| 664 | goto error; |
| 665 | } |
| 666 | |
| 667 | /* Capture descriptors */ |
| 668 | for (i = 0; i < capture_descr_count; i++) { |
| 669 | enum lttng_condition_status status; |
| 670 | struct lttng_capture_descriptor *desc; |
| 671 | struct lttng_event_expr *expr = event_expr_from_payload( |
| 672 | view, &offset); |
| 673 | int32_t payload_index = int_from_buffer(&view->buffer, sizeof(int32_t), |
| 674 | &offset); |
| 675 | |
| 676 | if (!expr) { |
| 677 | goto error; |
| 678 | } |
| 679 | |
| 680 | /* Move ownership of `expr` to `condition` */ |
| 681 | status = lttng_condition_event_rule_append_capture_descriptor( |
| 682 | condition, expr); |
| 683 | if (status != LTTNG_CONDITION_STATUS_OK) { |
| 684 | /* `expr` not moved: destroy it */ |
| 685 | lttng_event_expr_destroy(expr); |
| 686 | goto error; |
| 687 | } |
| 688 | |
| 689 | /* |
| 690 | * Set the internal payload object for the descriptor. This can |
| 691 | * be used by liblttng-ctl to access capture msgpack payload on |
| 692 | * the client side. |
| 693 | */ |
| 694 | desc = lttng_condition_event_rule_get_internal_capture_descriptor_at_index(condition, i); |
| 695 | if (desc == NULL) { |
| 696 | goto error; |
| 697 | } |
| 698 | desc->capture_index = payload_index; |
| 699 | } |
| 700 | |
| 701 | consumed_length = (ssize_t) offset; |
| 702 | *_condition = condition; |
| 703 | condition = NULL; |
| 704 | goto end; |
| 705 | |
| 706 | error: |
| 707 | consumed_length = -1; |
| 708 | |
| 709 | end: |
| 710 | lttng_event_rule_destroy(event_rule); |
| 711 | lttng_condition_destroy(condition); |
| 712 | return consumed_length; |
| 713 | } |
| 714 | |
| 715 | LTTNG_HIDDEN |
| 716 | enum lttng_condition_status lttng_condition_event_rule_get_rule_mutable( |
| 717 | const struct lttng_condition *condition, |
| 718 | struct lttng_event_rule **rule) |
| 719 | { |
| 720 | struct lttng_condition_event_rule *event_rule; |
| 721 | enum lttng_condition_status status = LTTNG_CONDITION_STATUS_OK; |
| 722 | |
| 723 | if (!condition || !IS_EVENT_RULE_CONDITION(condition) || !rule) { |
| 724 | status = LTTNG_CONDITION_STATUS_INVALID; |
| 725 | goto end; |
| 726 | } |
| 727 | |
| 728 | event_rule = container_of( |
| 729 | condition, struct lttng_condition_event_rule, parent); |
| 730 | if (!event_rule->rule) { |
| 731 | status = LTTNG_CONDITION_STATUS_UNSET; |
| 732 | goto end; |
| 733 | } |
| 734 | *rule = event_rule->rule; |
| 735 | end: |
| 736 | return status; |
| 737 | } |
| 738 | |
| 739 | enum lttng_condition_status lttng_condition_event_rule_get_rule( |
| 740 | const struct lttng_condition *condition, |
| 741 | const struct lttng_event_rule **rule) |
| 742 | { |
| 743 | struct lttng_event_rule *mutable_rule = NULL; |
| 744 | enum lttng_condition_status status; |
| 745 | |
| 746 | status = lttng_condition_event_rule_get_rule_mutable( |
| 747 | condition, &mutable_rule); |
| 748 | *rule = mutable_rule; |
| 749 | return status; |
| 750 | } |
| 751 | |
| 752 | enum lttng_condition_status |
| 753 | lttng_condition_event_rule_append_capture_descriptor( |
| 754 | struct lttng_condition *condition, |
| 755 | struct lttng_event_expr *expr) |
| 756 | { |
| 757 | enum lttng_condition_status status = LTTNG_CONDITION_STATUS_OK; |
| 758 | struct lttng_condition_event_rule *event_rule_cond = |
| 759 | container_of(condition, |
| 760 | struct lttng_condition_event_rule, parent); |
| 761 | int ret; |
| 762 | struct lttng_capture_descriptor *descriptor = NULL; |
| 763 | const struct lttng_event_rule *rule = NULL; |
| 764 | |
| 765 | /* Only accept l-values */ |
| 766 | if (!condition || !IS_EVENT_RULE_CONDITION(condition) || !expr || |
| 767 | !lttng_event_expr_is_lvalue(expr)) { |
| 768 | status = LTTNG_CONDITION_STATUS_INVALID; |
| 769 | goto end; |
| 770 | } |
| 771 | |
| 772 | status = lttng_condition_event_rule_get_rule(condition, &rule); |
| 773 | if (status != LTTNG_CONDITION_STATUS_OK) { |
| 774 | goto end; |
| 775 | } |
| 776 | |
| 777 | switch(lttng_event_rule_get_type(rule)) { |
| 778 | case LTTNG_EVENT_RULE_TYPE_TRACEPOINT: |
| 779 | case LTTNG_EVENT_RULE_TYPE_SYSCALL: |
| 780 | /* Supported */ |
| 781 | status = LTTNG_CONDITION_STATUS_OK; |
| 782 | break; |
| 783 | case LTTNG_EVENT_RULE_TYPE_UNKNOWN: |
| 784 | status = LTTNG_CONDITION_STATUS_INVALID; |
| 785 | break; |
| 786 | default: |
| 787 | status = LTTNG_CONDITION_STATUS_UNSUPPORTED; |
| 788 | break; |
| 789 | } |
| 790 | |
| 791 | if (status != LTTNG_CONDITION_STATUS_OK) { |
| 792 | goto end; |
| 793 | } |
| 794 | |
| 795 | descriptor = malloc(sizeof(*descriptor)); |
| 796 | if (descriptor == NULL) { |
| 797 | status = LTTNG_CONDITION_STATUS_ERROR; |
| 798 | goto end; |
| 799 | } |
| 800 | |
| 801 | descriptor->capture_index = -1; |
| 802 | descriptor->event_expression = expr; |
| 803 | |
| 804 | ret = lttng_dynamic_pointer_array_add_pointer( |
| 805 | &event_rule_cond->capture_descriptors, descriptor); |
| 806 | if (ret) { |
| 807 | status = LTTNG_CONDITION_STATUS_ERROR; |
| 808 | goto end; |
| 809 | } |
| 810 | |
| 811 | /* Ownership is transfered to the internal capture_descriptors array */ |
| 812 | descriptor = NULL; |
| 813 | end: |
| 814 | free(descriptor); |
| 815 | return status; |
| 816 | } |
| 817 | |
| 818 | enum lttng_condition_status |
| 819 | lttng_condition_event_rule_get_capture_descriptor_count( |
| 820 | const struct lttng_condition *condition, unsigned int *count) |
| 821 | { |
| 822 | enum lttng_condition_status status = LTTNG_CONDITION_STATUS_OK; |
| 823 | const struct lttng_condition_event_rule *event_rule_cond = |
| 824 | container_of(condition, |
| 825 | const struct lttng_condition_event_rule, |
| 826 | parent); |
| 827 | |
| 828 | if (!condition || !IS_EVENT_RULE_CONDITION(condition) || !count) { |
| 829 | status = LTTNG_CONDITION_STATUS_INVALID; |
| 830 | goto end; |
| 831 | } |
| 832 | |
| 833 | *count = lttng_dynamic_pointer_array_get_count( |
| 834 | &event_rule_cond->capture_descriptors); |
| 835 | |
| 836 | end: |
| 837 | return status; |
| 838 | } |
| 839 | |
| 840 | const struct lttng_event_expr * |
| 841 | lttng_condition_event_rule_get_capture_descriptor_at_index( |
| 842 | const struct lttng_condition *condition, unsigned int index) |
| 843 | { |
| 844 | const struct lttng_event_expr *expr = NULL; |
| 845 | const struct lttng_capture_descriptor *desc = NULL; |
| 846 | |
| 847 | desc = lttng_condition_event_rule_get_internal_capture_descriptor_at_index( |
| 848 | condition, index); |
| 849 | if (desc == NULL) { |
| 850 | goto end; |
| 851 | } |
| 852 | expr = desc->event_expression; |
| 853 | |
| 854 | end: |
| 855 | return expr; |
| 856 | } |
| 857 | |
| 858 | LTTNG_HIDDEN |
| 859 | ssize_t lttng_evaluation_event_rule_create_from_payload( |
| 860 | const struct lttng_condition_event_rule *condition, |
| 861 | struct lttng_payload_view *view, |
| 862 | struct lttng_evaluation **_evaluation) |
| 863 | { |
| 864 | ssize_t ret, offset = 0; |
| 865 | const char *name; |
| 866 | struct lttng_evaluation *evaluation = NULL; |
| 867 | const struct lttng_evaluation_event_rule_comm *comm = |
| 868 | (const struct lttng_evaluation_event_rule_comm *) |
| 869 | view->buffer.data; |
| 870 | uint32_t capture_payload_size; |
| 871 | const char *capture_payload = NULL; |
| 872 | |
| 873 | if (!_evaluation) { |
| 874 | ret = -1; |
| 875 | goto error; |
| 876 | } |
| 877 | |
| 878 | if (view->buffer.size < sizeof(*comm)) { |
| 879 | ret = -1; |
| 880 | goto error; |
| 881 | } |
| 882 | |
| 883 | /* Map the name, view of the payload */ |
| 884 | offset += sizeof(*comm); |
| 885 | { |
| 886 | struct lttng_payload_view current_view = |
| 887 | lttng_payload_view_from_view(view, offset, |
| 888 | comm->trigger_name_length); |
| 889 | name = current_view.buffer.data; |
| 890 | if (!name) { |
| 891 | ret = -1; |
| 892 | goto error; |
| 893 | } |
| 894 | |
| 895 | if (!lttng_buffer_view_contains_string(¤t_view.buffer, |
| 896 | name, comm->trigger_name_length)) { |
| 897 | ret = -1; |
| 898 | goto error; |
| 899 | } |
| 900 | } |
| 901 | |
| 902 | offset += comm->trigger_name_length; |
| 903 | { |
| 904 | struct lttng_payload_view current_view = lttng_payload_view_from_view(view, offset, -1); |
| 905 | |
| 906 | if (current_view.buffer.size < sizeof(capture_payload_size)) { |
| 907 | ret = -1; |
| 908 | goto error; |
| 909 | } |
| 910 | |
| 911 | memcpy(&capture_payload_size, current_view.buffer.data, |
| 912 | sizeof(capture_payload_size)); |
| 913 | } |
| 914 | offset += sizeof(capture_payload_size); |
| 915 | |
| 916 | if (capture_payload_size > 0) { |
| 917 | struct lttng_payload_view current_view = lttng_payload_view_from_view(view, offset, -1); |
| 918 | |
| 919 | if (current_view.buffer.size < capture_payload_size) { |
| 920 | ret = -1; |
| 921 | goto error; |
| 922 | } |
| 923 | |
| 924 | capture_payload = current_view.buffer.data; |
| 925 | } |
| 926 | |
| 927 | evaluation = lttng_evaluation_event_rule_create(condition, name, |
| 928 | capture_payload, capture_payload_size, true); |
| 929 | if (!evaluation) { |
| 930 | ret = -1; |
| 931 | goto error; |
| 932 | } |
| 933 | |
| 934 | offset += capture_payload_size; |
| 935 | *_evaluation = evaluation; |
| 936 | evaluation = NULL; |
| 937 | ret = offset; |
| 938 | |
| 939 | error: |
| 940 | lttng_evaluation_destroy(evaluation); |
| 941 | return ret; |
| 942 | } |
| 943 | |
| 944 | static int lttng_evaluation_event_rule_serialize( |
| 945 | const struct lttng_evaluation *evaluation, |
| 946 | struct lttng_payload *payload) |
| 947 | { |
| 948 | int ret = 0; |
| 949 | struct lttng_evaluation_event_rule *hit; |
| 950 | struct lttng_evaluation_event_rule_comm comm; |
| 951 | uint32_t capture_payload_size; |
| 952 | |
| 953 | hit = container_of( |
| 954 | evaluation, struct lttng_evaluation_event_rule, parent); |
| 955 | comm.trigger_name_length = strlen(hit->name) + 1; |
| 956 | ret = lttng_dynamic_buffer_append( |
| 957 | &payload->buffer, &comm, sizeof(comm)); |
| 958 | if (ret) { |
| 959 | goto end; |
| 960 | } |
| 961 | ret = lttng_dynamic_buffer_append( |
| 962 | &payload->buffer, hit->name, comm.trigger_name_length); |
| 963 | if (ret) { |
| 964 | goto end; |
| 965 | } |
| 966 | |
| 967 | capture_payload_size = (uint32_t) hit->capture_payload.size; |
| 968 | ret = lttng_dynamic_buffer_append(&payload->buffer, &capture_payload_size, |
| 969 | sizeof(capture_payload_size)); |
| 970 | if (ret) { |
| 971 | goto end; |
| 972 | } |
| 973 | |
| 974 | ret = lttng_dynamic_buffer_append(&payload->buffer, hit->capture_payload.data, |
| 975 | hit->capture_payload.size); |
| 976 | if (ret) { |
| 977 | goto end; |
| 978 | } |
| 979 | |
| 980 | end: |
| 981 | return ret; |
| 982 | } |
| 983 | |
| 984 | static |
| 985 | bool msgpack_str_is_equal(const struct msgpack_object *obj, const char *str) |
| 986 | { |
| 987 | bool is_equal = true; |
| 988 | |
| 989 | assert(obj->type == MSGPACK_OBJECT_STR); |
| 990 | |
| 991 | if (obj->via.str.size != strlen(str)) { |
| 992 | is_equal = false; |
| 993 | goto end; |
| 994 | } |
| 995 | |
| 996 | if (strncmp(obj->via.str.ptr, str, obj->via.str.size) != 0) { |
| 997 | is_equal = false; |
| 998 | goto end; |
| 999 | } |
| 1000 | |
| 1001 | end: |
| 1002 | return is_equal; |
| 1003 | } |
| 1004 | |
| 1005 | static |
| 1006 | const msgpack_object *get_msgpack_map_obj(const struct msgpack_object *map_obj, |
| 1007 | const char *name) |
| 1008 | { |
| 1009 | const msgpack_object *ret = NULL; |
| 1010 | size_t i; |
| 1011 | |
| 1012 | assert(map_obj->type == MSGPACK_OBJECT_MAP); |
| 1013 | |
| 1014 | for (i = 0; i < map_obj->via.map.size; i++) { |
| 1015 | const struct msgpack_object_kv *kv = &map_obj->via.map.ptr[i]; |
| 1016 | |
| 1017 | assert(kv->key.type == MSGPACK_OBJECT_STR); |
| 1018 | |
| 1019 | if (msgpack_str_is_equal(&kv->key, name)) { |
| 1020 | ret = &kv->val; |
| 1021 | goto end; |
| 1022 | } |
| 1023 | } |
| 1024 | |
| 1025 | end: |
| 1026 | return ret; |
| 1027 | } |
| 1028 | |
| 1029 | static void lttng_evaluation_event_rule_destroy( |
| 1030 | struct lttng_evaluation *evaluation) |
| 1031 | { |
| 1032 | struct lttng_evaluation_event_rule *hit; |
| 1033 | |
| 1034 | hit = container_of( |
| 1035 | evaluation, struct lttng_evaluation_event_rule, parent); |
| 1036 | free(hit->name); |
| 1037 | lttng_dynamic_buffer_reset(&hit->capture_payload); |
| 1038 | if (hit->captured_values) { |
| 1039 | lttng_event_field_value_destroy(hit->captured_values); |
| 1040 | } |
| 1041 | free(hit); |
| 1042 | } |
| 1043 | |
| 1044 | static |
| 1045 | int event_field_value_from_obj(const msgpack_object *obj, |
| 1046 | struct lttng_event_field_value **field_val) |
| 1047 | { |
| 1048 | assert(obj); |
| 1049 | assert(field_val); |
| 1050 | int ret = 0; |
| 1051 | |
| 1052 | switch (obj->type) { |
| 1053 | case MSGPACK_OBJECT_NIL: |
| 1054 | /* Unavailable */ |
| 1055 | *field_val = NULL; |
| 1056 | goto end; |
| 1057 | case MSGPACK_OBJECT_POSITIVE_INTEGER: |
| 1058 | *field_val = lttng_event_field_value_uint_create( |
| 1059 | obj->via.u64); |
| 1060 | break; |
| 1061 | case MSGPACK_OBJECT_NEGATIVE_INTEGER: |
| 1062 | *field_val = lttng_event_field_value_int_create( |
| 1063 | obj->via.i64); |
| 1064 | break; |
| 1065 | case MSGPACK_OBJECT_FLOAT32: |
| 1066 | case MSGPACK_OBJECT_FLOAT64: |
| 1067 | *field_val = lttng_event_field_value_real_create( |
| 1068 | obj->via.f64); |
| 1069 | break; |
| 1070 | case MSGPACK_OBJECT_STR: |
| 1071 | *field_val = lttng_event_field_value_string_create_with_size( |
| 1072 | obj->via.str.ptr, obj->via.str.size); |
| 1073 | break; |
| 1074 | case MSGPACK_OBJECT_ARRAY: |
| 1075 | { |
| 1076 | size_t i; |
| 1077 | |
| 1078 | *field_val = lttng_event_field_value_array_create(); |
| 1079 | if (!*field_val) { |
| 1080 | goto error; |
| 1081 | } |
| 1082 | |
| 1083 | for (i = 0; i < obj->via.array.size; i++) { |
| 1084 | const msgpack_object *elem_obj = &obj->via.array.ptr[i]; |
| 1085 | struct lttng_event_field_value *elem_field_val; |
| 1086 | |
| 1087 | ret = event_field_value_from_obj(elem_obj, |
| 1088 | &elem_field_val); |
| 1089 | |
| 1090 | if (ret) { |
| 1091 | goto error; |
| 1092 | } |
| 1093 | |
| 1094 | if (elem_field_val) { |
| 1095 | ret = lttng_event_field_value_array_append( |
| 1096 | *field_val, elem_field_val); |
| 1097 | } else { |
| 1098 | ret = lttng_event_field_value_array_append_unavailable( |
| 1099 | *field_val); |
| 1100 | } |
| 1101 | |
| 1102 | if (ret) { |
| 1103 | lttng_event_field_value_destroy(elem_field_val); |
| 1104 | goto error; |
| 1105 | } |
| 1106 | } |
| 1107 | |
| 1108 | break; |
| 1109 | } |
| 1110 | case MSGPACK_OBJECT_MAP: |
| 1111 | { |
| 1112 | /* |
| 1113 | * As of this version, the only valid map object is |
| 1114 | * for an enumeration value, for example: |
| 1115 | * |
| 1116 | * type: enum |
| 1117 | * value: 177 |
| 1118 | * labels: |
| 1119 | * - Labatt 50 |
| 1120 | * - Molson Dry |
| 1121 | * - Carling Black Label |
| 1122 | */ |
| 1123 | const msgpack_object *inner_obj; |
| 1124 | size_t label_i; |
| 1125 | |
| 1126 | inner_obj = get_msgpack_map_obj(obj, "type"); |
| 1127 | if (!inner_obj) { |
| 1128 | ERR("Missing `type` entry in map object."); |
| 1129 | goto error; |
| 1130 | } |
| 1131 | |
| 1132 | if (inner_obj->type != MSGPACK_OBJECT_STR) { |
| 1133 | ERR("Map object's `type` entry is not a string (it's a %d).", |
| 1134 | inner_obj->type); |
| 1135 | goto error; |
| 1136 | } |
| 1137 | |
| 1138 | if (!msgpack_str_is_equal(inner_obj, "enum")) { |
| 1139 | ERR("Map object's `type` entry: expecting `enum`."); |
| 1140 | goto error; |
| 1141 | } |
| 1142 | |
| 1143 | inner_obj = get_msgpack_map_obj(obj, "value"); |
| 1144 | if (!inner_obj) { |
| 1145 | ERR("Missing `value` entry in map object."); |
| 1146 | goto error; |
| 1147 | } |
| 1148 | |
| 1149 | if (inner_obj->type == MSGPACK_OBJECT_POSITIVE_INTEGER) { |
| 1150 | *field_val = lttng_event_field_value_enum_uint_create( |
| 1151 | inner_obj->via.u64); |
| 1152 | } else if (inner_obj->type == MSGPACK_OBJECT_NEGATIVE_INTEGER) { |
| 1153 | *field_val = lttng_event_field_value_enum_int_create( |
| 1154 | inner_obj->via.i64); |
| 1155 | } else { |
| 1156 | ERR("Map object's `value` entry is not an integer (it's a %d).", |
| 1157 | inner_obj->type); |
| 1158 | goto error; |
| 1159 | } |
| 1160 | |
| 1161 | if (!*field_val) { |
| 1162 | goto error; |
| 1163 | } |
| 1164 | |
| 1165 | inner_obj = get_msgpack_map_obj(obj, "labels"); |
| 1166 | if (!inner_obj) { |
| 1167 | /* No labels */ |
| 1168 | goto end; |
| 1169 | } |
| 1170 | |
| 1171 | if (inner_obj->type != MSGPACK_OBJECT_ARRAY) { |
| 1172 | ERR("Map object's `labels` entry is not an array (it's a %d).", |
| 1173 | inner_obj->type); |
| 1174 | goto error; |
| 1175 | } |
| 1176 | |
| 1177 | for (label_i = 0; label_i < inner_obj->via.array.size; |
| 1178 | label_i++) { |
| 1179 | int iret; |
| 1180 | const msgpack_object *elem_obj = |
| 1181 | &inner_obj->via.array.ptr[label_i]; |
| 1182 | |
| 1183 | if (elem_obj->type != MSGPACK_OBJECT_STR) { |
| 1184 | ERR("Map object's `labels` entry's type is not a string (it's a %d).", |
| 1185 | elem_obj->type); |
| 1186 | goto error; |
| 1187 | } |
| 1188 | |
| 1189 | iret = lttng_event_field_value_enum_append_label_with_size( |
| 1190 | *field_val, elem_obj->via.str.ptr, |
| 1191 | elem_obj->via.str.size); |
| 1192 | if (iret) { |
| 1193 | goto error; |
| 1194 | } |
| 1195 | } |
| 1196 | |
| 1197 | break; |
| 1198 | } |
| 1199 | default: |
| 1200 | ERR("Unexpected object type %d.", obj->type); |
| 1201 | goto error; |
| 1202 | } |
| 1203 | |
| 1204 | if (!*field_val) { |
| 1205 | goto error; |
| 1206 | } |
| 1207 | |
| 1208 | goto end; |
| 1209 | |
| 1210 | error: |
| 1211 | lttng_event_field_value_destroy(*field_val); |
| 1212 | *field_val = NULL; |
| 1213 | ret = -1; |
| 1214 | |
| 1215 | end: |
| 1216 | return ret; |
| 1217 | } |
| 1218 | |
| 1219 | static |
| 1220 | struct lttng_event_field_value *event_field_value_from_capture_payload( |
| 1221 | const struct lttng_condition_event_rule *condition, |
| 1222 | const char *capture_payload, size_t capture_payload_size) |
| 1223 | { |
| 1224 | struct lttng_event_field_value *ret = NULL; |
| 1225 | msgpack_unpacked unpacked; |
| 1226 | msgpack_unpack_return unpack_return; |
| 1227 | const msgpack_object *root_obj; |
| 1228 | const msgpack_object_array *root_array_obj; |
| 1229 | size_t i; |
| 1230 | size_t count; |
| 1231 | |
| 1232 | assert(condition); |
| 1233 | assert(capture_payload); |
| 1234 | |
| 1235 | /* Initialize value */ |
| 1236 | msgpack_unpacked_init(&unpacked); |
| 1237 | |
| 1238 | /* Decode */ |
| 1239 | unpack_return = msgpack_unpack_next(&unpacked, capture_payload, |
| 1240 | capture_payload_size, NULL); |
| 1241 | if (unpack_return != MSGPACK_UNPACK_SUCCESS) { |
| 1242 | ERR("msgpack_unpack_next() failed to decode the " |
| 1243 | "MessagePack-encoded capture payload " |
| 1244 | "(size %zu); returned %d.", |
| 1245 | capture_payload_size, unpack_return); |
| 1246 | goto error; |
| 1247 | } |
| 1248 | |
| 1249 | /* Get root array */ |
| 1250 | root_obj = &unpacked.data; |
| 1251 | |
| 1252 | if (root_obj->type != MSGPACK_OBJECT_ARRAY) { |
| 1253 | ERR("Expecting an array as the root object; got type %d.", |
| 1254 | root_obj->type); |
| 1255 | goto error; |
| 1256 | } |
| 1257 | |
| 1258 | root_array_obj = &root_obj->via.array; |
| 1259 | |
| 1260 | /* Create an empty root array event field value */ |
| 1261 | ret = lttng_event_field_value_array_create(); |
| 1262 | if (!ret) { |
| 1263 | goto error; |
| 1264 | } |
| 1265 | |
| 1266 | /* |
| 1267 | * For each capture descriptor in the condition object: |
| 1268 | * |
| 1269 | * 1. Get its corresponding captured field value MessagePack |
| 1270 | * object. |
| 1271 | * |
| 1272 | * 2. Create a corresponding event field value. |
| 1273 | * |
| 1274 | * 3. Append it to `ret` (the root array event field value). |
| 1275 | */ |
| 1276 | count = lttng_dynamic_pointer_array_get_count( |
| 1277 | &condition->capture_descriptors); |
| 1278 | assert(count > 0); |
| 1279 | |
| 1280 | for (i = 0; i < count; i++) { |
| 1281 | const struct lttng_capture_descriptor *capture_descriptor = |
| 1282 | lttng_condition_event_rule_get_internal_capture_descriptor_at_index( |
| 1283 | &condition->parent, i); |
| 1284 | const msgpack_object *elem_obj; |
| 1285 | struct lttng_event_field_value *elem_field_val; |
| 1286 | int iret; |
| 1287 | |
| 1288 | assert(capture_descriptor); |
| 1289 | assert(capture_descriptor->capture_index >= 0); |
| 1290 | |
| 1291 | if (capture_descriptor->capture_index >= root_array_obj->size) { |
| 1292 | ERR("Root array object of size %u does not have enough " |
| 1293 | "elements for the capture index %u " |
| 1294 | "(for capture descriptor #%zu).", |
| 1295 | (unsigned int) root_array_obj->size, |
| 1296 | (unsigned int) capture_descriptor->capture_index, |
| 1297 | i); |
| 1298 | goto error; |
| 1299 | } |
| 1300 | |
| 1301 | elem_obj = &root_array_obj->ptr[(size_t) capture_descriptor->capture_index]; |
| 1302 | iret = event_field_value_from_obj(elem_obj, |
| 1303 | &elem_field_val); |
| 1304 | if (iret) { |
| 1305 | goto error; |
| 1306 | } |
| 1307 | |
| 1308 | if (elem_field_val) { |
| 1309 | iret = lttng_event_field_value_array_append(ret, |
| 1310 | elem_field_val); |
| 1311 | } else { |
| 1312 | iret = lttng_event_field_value_array_append_unavailable( |
| 1313 | ret); |
| 1314 | } |
| 1315 | |
| 1316 | if (iret) { |
| 1317 | lttng_event_field_value_destroy(elem_field_val); |
| 1318 | goto error; |
| 1319 | } |
| 1320 | } |
| 1321 | |
| 1322 | goto end; |
| 1323 | |
| 1324 | error: |
| 1325 | lttng_event_field_value_destroy(ret); |
| 1326 | ret = NULL; |
| 1327 | |
| 1328 | end: |
| 1329 | msgpack_unpacked_destroy(&unpacked); |
| 1330 | return ret; |
| 1331 | } |
| 1332 | |
| 1333 | LTTNG_HIDDEN |
| 1334 | struct lttng_evaluation *lttng_evaluation_event_rule_create( |
| 1335 | const struct lttng_condition_event_rule *condition, |
| 1336 | const char *trigger_name, |
| 1337 | const char *capture_payload, size_t capture_payload_size, |
| 1338 | bool decode_capture_payload) |
| 1339 | { |
| 1340 | struct lttng_evaluation_event_rule *hit; |
| 1341 | struct lttng_evaluation *evaluation = NULL; |
| 1342 | |
| 1343 | hit = zmalloc(sizeof(struct lttng_evaluation_event_rule)); |
| 1344 | if (!hit) { |
| 1345 | goto error; |
| 1346 | } |
| 1347 | |
| 1348 | hit->name = strdup(trigger_name); |
| 1349 | if (!hit->name) { |
| 1350 | goto error; |
| 1351 | } |
| 1352 | |
| 1353 | lttng_dynamic_buffer_init(&hit->capture_payload); |
| 1354 | |
| 1355 | if (capture_payload) { |
| 1356 | lttng_dynamic_buffer_append(&hit->capture_payload, |
| 1357 | capture_payload, capture_payload_size); |
| 1358 | |
| 1359 | if (decode_capture_payload) { |
| 1360 | hit->captured_values = |
| 1361 | event_field_value_from_capture_payload( |
| 1362 | condition, |
| 1363 | capture_payload, |
| 1364 | capture_payload_size); |
| 1365 | if (!hit->captured_values) { |
| 1366 | ERR("Failed to decode the capture payload (size %zu).", |
| 1367 | capture_payload_size); |
| 1368 | goto error; |
| 1369 | } |
| 1370 | } |
| 1371 | } |
| 1372 | |
| 1373 | hit->parent.type = LTTNG_CONDITION_TYPE_EVENT_RULE_HIT; |
| 1374 | hit->parent.serialize = lttng_evaluation_event_rule_serialize; |
| 1375 | hit->parent.destroy = lttng_evaluation_event_rule_destroy; |
| 1376 | |
| 1377 | evaluation = &hit->parent; |
| 1378 | hit = NULL; |
| 1379 | |
| 1380 | error: |
| 1381 | if (hit) { |
| 1382 | lttng_evaluation_event_rule_destroy(&hit->parent); |
| 1383 | } |
| 1384 | |
| 1385 | return evaluation; |
| 1386 | } |
| 1387 | |
| 1388 | enum lttng_evaluation_status lttng_evaluation_get_captured_values( |
| 1389 | const struct lttng_evaluation *evaluation, |
| 1390 | const struct lttng_event_field_value **field_val) |
| 1391 | { |
| 1392 | struct lttng_evaluation_event_rule *hit; |
| 1393 | enum lttng_evaluation_status status = LTTNG_EVALUATION_STATUS_OK; |
| 1394 | |
| 1395 | if (!evaluation || !is_event_rule_evaluation(evaluation) || |
| 1396 | !field_val) { |
| 1397 | status = LTTNG_EVALUATION_STATUS_INVALID; |
| 1398 | goto end; |
| 1399 | } |
| 1400 | |
| 1401 | hit = container_of(evaluation, struct lttng_evaluation_event_rule, |
| 1402 | parent); |
| 1403 | if (!hit->captured_values) { |
| 1404 | status = LTTNG_EVALUATION_STATUS_INVALID; |
| 1405 | goto end; |
| 1406 | } |
| 1407 | |
| 1408 | *field_val = hit->captured_values; |
| 1409 | |
| 1410 | end: |
| 1411 | return status; |
| 1412 | } |
| 1413 | |
| 1414 | enum lttng_evaluation_status lttng_evaluation_event_rule_get_trigger_name( |
| 1415 | const struct lttng_evaluation *evaluation, const char **name) |
| 1416 | { |
| 1417 | struct lttng_evaluation_event_rule *hit; |
| 1418 | enum lttng_evaluation_status status = LTTNG_EVALUATION_STATUS_OK; |
| 1419 | |
| 1420 | if (!evaluation || !is_event_rule_evaluation(evaluation) || !name) { |
| 1421 | status = LTTNG_EVALUATION_STATUS_INVALID; |
| 1422 | goto end; |
| 1423 | } |
| 1424 | |
| 1425 | hit = container_of( |
| 1426 | evaluation, struct lttng_evaluation_event_rule, parent); |
| 1427 | *name = hit->name; |
| 1428 | end: |
| 1429 | return status; |
| 1430 | } |
| 1431 | |
| 1432 | LTTNG_HIDDEN |
| 1433 | enum lttng_error_code |
| 1434 | lttng_condition_event_rule_generate_capture_descriptor_bytecode_set( |
| 1435 | struct lttng_condition *condition, |
| 1436 | struct lttng_dynamic_pointer_array *bytecode_set) |
| 1437 | { |
| 1438 | enum lttng_error_code ret; |
| 1439 | enum lttng_condition_status status; |
| 1440 | unsigned int capture_count; |
| 1441 | const struct lttng_condition_event_rule_capture_bytecode_element *set_element; |
| 1442 | struct lttng_capture_descriptor *local_capture_desc; |
| 1443 | ssize_t set_count; |
| 1444 | struct lttng_condition_event_rule_capture_bytecode_element *set_element_to_append = |
| 1445 | NULL; |
| 1446 | struct lttng_bytecode *bytecode = NULL; |
| 1447 | |
| 1448 | if (!condition || !IS_EVENT_RULE_CONDITION(condition) || |
| 1449 | !bytecode_set) { |
| 1450 | ret = LTTNG_ERR_FATAL; |
| 1451 | goto end; |
| 1452 | } |
| 1453 | |
| 1454 | status = lttng_condition_event_rule_get_capture_descriptor_count( |
| 1455 | condition, &capture_count); |
| 1456 | if (status != LTTNG_CONDITION_STATUS_OK) { |
| 1457 | ret = LTTNG_ERR_FATAL; |
| 1458 | goto end; |
| 1459 | } |
| 1460 | |
| 1461 | /* |
| 1462 | * O(n^2), don't care. This code path is not hot. |
| 1463 | * Before inserting into the set, validate that the expression is not |
| 1464 | * already present in it. |
| 1465 | */ |
| 1466 | for (unsigned int i = 0; i < capture_count; i++) { |
| 1467 | int found_in_set = false; |
| 1468 | |
| 1469 | set_count = lttng_dynamic_pointer_array_get_count(bytecode_set); |
| 1470 | |
| 1471 | local_capture_desc = |
| 1472 | lttng_condition_event_rule_get_internal_capture_descriptor_at_index( |
| 1473 | condition, i); |
| 1474 | if (local_capture_desc == NULL) { |
| 1475 | ret = LTTNG_ERR_FATAL; |
| 1476 | goto end; |
| 1477 | } |
| 1478 | |
| 1479 | /* |
| 1480 | * Iterate over the set to check if already present in the set. |
| 1481 | */ |
| 1482 | for (ssize_t j = 0; j < set_count; j++) { |
| 1483 | set_element = (struct lttng_condition_event_rule_capture_bytecode_element |
| 1484 | *) |
| 1485 | lttng_dynamic_pointer_array_get_pointer( |
| 1486 | bytecode_set, j); |
| 1487 | if (set_element == NULL) { |
| 1488 | ret = LTTNG_ERR_FATAL; |
| 1489 | goto end; |
| 1490 | } |
| 1491 | |
| 1492 | if (!lttng_event_expr_is_equal( |
| 1493 | local_capture_desc->event_expression, |
| 1494 | set_element->expression)) { |
| 1495 | /* Check against next set element */ |
| 1496 | continue; |
| 1497 | } |
| 1498 | |
| 1499 | /* |
| 1500 | * Already present in the set, assign the |
| 1501 | * capture index of the capture descriptor for |
| 1502 | * future use. |
| 1503 | */ |
| 1504 | found_in_set = true; |
| 1505 | local_capture_desc->capture_index = j; |
| 1506 | /* Exit inner loop */ |
| 1507 | break; |
| 1508 | } |
| 1509 | |
| 1510 | if (found_in_set) { |
| 1511 | /* Process next local capture descriptor */ |
| 1512 | continue; |
| 1513 | } |
| 1514 | |
| 1515 | /* |
| 1516 | * Not found in the set. |
| 1517 | * Insert the capture descriptor in the set. |
| 1518 | */ |
| 1519 | set_element_to_append = malloc(sizeof(*set_element_to_append)); |
| 1520 | if (set_element_to_append == NULL) { |
| 1521 | ret = LTTNG_ERR_NOMEM; |
| 1522 | goto end; |
| 1523 | } |
| 1524 | |
| 1525 | /* Generate the bytecode */ |
| 1526 | status = lttng_event_expr_to_bytecode( |
| 1527 | local_capture_desc->event_expression, |
| 1528 | &bytecode); |
| 1529 | if (status < 0 || bytecode == NULL) { |
| 1530 | /* TODO: return pertinent capture related error code */ |
| 1531 | ret = LTTNG_ERR_FILTER_INVAL; |
| 1532 | goto end; |
| 1533 | } |
| 1534 | |
| 1535 | set_element_to_append->bytecode = bytecode; |
| 1536 | |
| 1537 | /* |
| 1538 | * Ensure the lifetime of the event expression. |
| 1539 | * Our reference will be put on condition destroy. |
| 1540 | */ |
| 1541 | lttng_event_expr_get(local_capture_desc->event_expression); |
| 1542 | set_element_to_append->expression = |
| 1543 | local_capture_desc->event_expression; |
| 1544 | |
| 1545 | ret = lttng_dynamic_pointer_array_add_pointer( |
| 1546 | bytecode_set, set_element_to_append); |
| 1547 | if (ret < 0) { |
| 1548 | ret = LTTNG_ERR_NOMEM; |
| 1549 | goto end; |
| 1550 | } |
| 1551 | |
| 1552 | /* Ownership tranfered to the bytecode set */ |
| 1553 | set_element_to_append = NULL; |
| 1554 | bytecode = NULL; |
| 1555 | |
| 1556 | /* Assign the capture descriptor for future use */ |
| 1557 | local_capture_desc->capture_index = set_count; |
| 1558 | } |
| 1559 | |
| 1560 | /* Everything went better than expected */ |
| 1561 | ret = LTTNG_OK; |
| 1562 | |
| 1563 | end: |
| 1564 | free(set_element_to_append); |
| 1565 | free(bytecode); |
| 1566 | return ret; |
| 1567 | } |