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