src/common/conditions/event-rule-matches.cpp

   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 <common/error.hpp>
   9 #include <common/macros.hpp>
  10 #include <common/mi-lttng.hpp>
  11 #include <inttypes.h>
  12 #include <limits.h>
  13 #include <lttng/condition/condition-internal.hpp>
  14 #include <lttng/condition/event-rule-matches-internal.hpp>
  15 #include <lttng/condition/event-rule-matches.h>
  16 #include <lttng/event-expr-internal.hpp>
  17 #include <lttng/event-expr.h>
  18 #include <lttng/event-field-value-internal.hpp>
  19 #include <lttng/event-rule/event-rule-internal.hpp>
  20 #include <lttng/lttng-error.h>
  21 #include <stdbool.h>
  22 #include <stdint.h>
  23 #include <vendor/msgpack/msgpack.h>
  24
  25 #define IS_EVENT_RULE_MATCHES_CONDITION(condition) \
  26         (lttng_condition_get_type(condition) ==    \
  27                         LTTNG_CONDITION_TYPE_EVENT_RULE_MATCHES)
  28
  29 static bool is_event_rule_matches_evaluation(
  30                 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_MATCHES;
  35 }
  36
  37 static bool lttng_condition_event_rule_matches_validate(
  38                 const struct lttng_condition *condition);
  39 static int lttng_condition_event_rule_matches_serialize(
  40                 const struct lttng_condition *condition,
  41                 struct lttng_payload *payload);
  42 static bool lttng_condition_event_rule_matches_is_equal(
  43                 const struct lttng_condition *_a,
  44                 const struct lttng_condition *_b);
  45 static void lttng_condition_event_rule_matches_destroy(
  46                 struct lttng_condition *condition);
  47
  48 static bool lttng_condition_event_rule_matches_validate(
  49                 const struct lttng_condition *condition)
  50 {
  51         bool valid = false;
  52         struct lttng_condition_event_rule_matches *event_rule;
  53
  54         if (!condition) {
  55                 goto end;
  56         }
  57
  58         event_rule = container_of(condition,
  59                         struct lttng_condition_event_rule_matches, parent);
  60         if (!event_rule->rule) {
  61                 ERR("Invalid on event 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 static const char *msgpack_object_type_str(msgpack_object_type type)
  71 {
  72         const char *name;
  73
  74         switch (type) {
  75         case MSGPACK_OBJECT_NIL:
  76                 name = "MSGPACK_OBJECT_NIL";
  77                 break;
  78         case MSGPACK_OBJECT_BOOLEAN:
  79                 name = "MSGPACK_OBJECT_BOOLEAN";
  80                 break;
  81         case MSGPACK_OBJECT_POSITIVE_INTEGER:
  82                 name = "MSGPACK_OBJECT_POSITIVE_INTEGER";
  83                 break;
  84         case MSGPACK_OBJECT_NEGATIVE_INTEGER:
  85                 name = "MSGPACK_OBJECT_NEGATIVE_INTEGER";
  86                 break;
  87         case MSGPACK_OBJECT_FLOAT32:
  88                 name = "MSGPACK_OBJECT_FLOAT32";
  89                 break;
  90         case MSGPACK_OBJECT_FLOAT:
  91                 /* Same value as MSGPACK_OBJECT_FLOAT64 */
  92                 name = "MSGPACK_OBJECT_FLOAT(64)";
  93                 break;
  94         case MSGPACK_OBJECT_STR:
  95                 name = "MSGPACK_OBJECT_STR";
  96                 break;
  97         case MSGPACK_OBJECT_ARRAY:
  98                 name = "MSGPACK_OBJECT_ARRAY";
  99                 break;
 100         case MSGPACK_OBJECT_MAP:
 101                 name = "MSGPACK_OBJECT_MAP";
 102                 break;
 103         case MSGPACK_OBJECT_BIN:
 104                 name = "MSGPACK_OBJECT_BIN";
 105                 break;
 106         case MSGPACK_OBJECT_EXT:
 107                 name = "MSGPACK_OBJECT_EXT";
 108                 break;
 109         default:
 110                 abort();
 111         }
 112
 113         return name;
 114 }
 115
 116 /*
 117  * Serializes the C string `str` into `buf`.
 118  *
 119  * Encoding is the length of `str` plus one (for the null character),
 120  * and then the string, including its null terminator.
 121  */
 122 static
 123 int serialize_cstr(const char *str, struct lttng_dynamic_buffer *buf)
 124 {
 125         int ret;
 126         const uint32_t len = strlen(str) + 1;
 127
 128         /* Serialize the length, including the null terminator. */
 129         DBG("Serializing C string's length (including null terminator): "
 130                         "%" PRIu32, len);
 131         ret = lttng_dynamic_buffer_append(buf, &len, sizeof(len));
 132         if (ret) {
 133                 goto end;
 134         }
 135
 136         /* Serialize the string. */
 137         DBG("Serializing C string: '%s'", str);
 138         ret = lttng_dynamic_buffer_append(buf, str, len);
 139         if (ret) {
 140                 goto end;
 141         }
 142
 143 end:
 144         return ret;
 145 }
 146
 147 /*
 148  * Serializes the event expression `expr` into `buf`.
 149  */
 150 static
 151 int serialize_event_expr(const struct lttng_event_expr *expr,
 152                 struct lttng_payload *payload)
 153 {
 154         const uint8_t type = expr->type;
 155         int ret;
 156
 157         /* Serialize the expression's type. */
 158         DBG("Serializing event expression's type: %d", expr->type);
 159         ret = lttng_dynamic_buffer_append(&payload->buffer, &type, sizeof(type));
 160         if (ret) {
 161                 goto end;
 162         }
 163
 164         /* Serialize the expression */
 165         switch (expr->type) {
 166         case LTTNG_EVENT_EXPR_TYPE_EVENT_PAYLOAD_FIELD:
 167         case LTTNG_EVENT_EXPR_TYPE_CHANNEL_CONTEXT_FIELD:
 168         {
 169                 const struct lttng_event_expr_field *field_expr =
 170                                 container_of(expr,
 171                                         const struct lttng_event_expr_field,
 172                                         parent);
 173
 174                 /* Serialize the field name. */
 175                 DBG("Serializing field event expression's field name: '%s'",
 176                                 field_expr->name);
 177                 ret = serialize_cstr(field_expr->name, &payload->buffer);
 178                 if (ret) {
 179                         goto end;
 180                 }
 181
 182                 break;
 183         }
 184         case LTTNG_EVENT_EXPR_TYPE_APP_SPECIFIC_CONTEXT_FIELD:
 185         {
 186                 const struct lttng_event_expr_app_specific_context_field *field_expr =
 187                                 container_of(expr,
 188                                         const struct lttng_event_expr_app_specific_context_field,
 189                                         parent);
 190
 191                 /* Serialize the provider name. */
 192                 DBG("Serializing app-specific context field event expression's "
 193                                 "provider name: '%s'",
 194                                 field_expr->provider_name);
 195                 ret = serialize_cstr(field_expr->provider_name, &payload->buffer);
 196                 if (ret) {
 197                         goto end;
 198                 }
 199
 200                 /* Serialize the type name. */
 201                 DBG("Serializing app-specific context field event expression's "
 202                                 "type name: '%s'",
 203                                 field_expr->provider_name);
 204                 ret = serialize_cstr(field_expr->type_name, &payload->buffer);
 205                 if (ret) {
 206                         goto end;
 207                 }
 208
 209                 break;
 210         }
 211         case LTTNG_EVENT_EXPR_TYPE_ARRAY_FIELD_ELEMENT:
 212         {
 213                 const struct lttng_event_expr_array_field_element *elem_expr =
 214                                 container_of(expr,
 215                                         const struct lttng_event_expr_array_field_element,
 216                                         parent);
 217                 const uint32_t index = elem_expr->index;
 218
 219                 /* Serialize the index. */
 220                 DBG("Serializing array field element event expression's "
 221                                 "index: %u", elem_expr->index);
 222                 ret = lttng_dynamic_buffer_append(&payload->buffer, &index, sizeof(index));
 223                 if (ret) {
 224                         goto end;
 225                 }
 226
 227                 /* Serialize the parent array field expression. */
 228                 DBG("Serializing array field element event expression's "
 229                                 "parent array field event expression");
 230                 ret = serialize_event_expr(elem_expr->array_field_expr, payload);
 231                 if (ret) {
 232                         goto end;
 233                 }
 234
 235                 break;
 236         }
 237         default:
 238                 break;
 239         }
 240
 241 end:
 242         return ret;
 243 }
 244
 245 static struct lttng_capture_descriptor *
 246 lttng_condition_event_rule_matches_get_internal_capture_descriptor_at_index(
 247                 const struct lttng_condition *condition, unsigned int index)
 248 {
 249         const struct lttng_condition_event_rule_matches
 250                         *event_rule_matches_cond = container_of(condition,
 251                                         const struct lttng_condition_event_rule_matches,
 252                                         parent);
 253         struct lttng_capture_descriptor *desc = NULL;
 254         unsigned int count;
 255         enum lttng_condition_status status;
 256
 257         if (!condition || !IS_EVENT_RULE_MATCHES_CONDITION(condition)) {
 258                 goto end;
 259         }
 260
 261         status = lttng_condition_event_rule_matches_get_capture_descriptor_count(
 262                         condition, &count);
 263         if (status != LTTNG_CONDITION_STATUS_OK) {
 264                 goto end;
 265         }
 266
 267         if (index >= count) {
 268                 goto end;
 269         }
 270
 271         desc = (lttng_capture_descriptor *) lttng_dynamic_pointer_array_get_pointer(
 272                         &event_rule_matches_cond->capture_descriptors, index);
 273 end:
 274         return desc;
 275 }
 276
 277 static int lttng_condition_event_rule_matches_serialize(
 278                 const struct lttng_condition *condition,
 279                 struct lttng_payload *payload)
 280 {
 281         int ret;
 282         struct lttng_condition_event_rule_matches *event_rule_matches_condition;
 283         enum lttng_condition_status status;
 284         /* Used for iteration and communication (size matters). */
 285         uint32_t i, capture_descr_count;
 286
 287         if (!condition || !IS_EVENT_RULE_MATCHES_CONDITION(condition)) {
 288                 ret = -1;
 289                 goto end;
 290         }
 291
 292         DBG("Serializing on event condition");
 293         event_rule_matches_condition = container_of(condition,
 294                         struct lttng_condition_event_rule_matches, parent);
 295
 296         DBG("Serializing on event condition's event rule");
 297         ret = lttng_event_rule_serialize(
 298                         event_rule_matches_condition->rule, payload);
 299         if (ret) {
 300                 goto end;
 301         }
 302
 303         status = lttng_condition_event_rule_matches_get_capture_descriptor_count(
 304                         condition, &capture_descr_count);
 305         if (status != LTTNG_CONDITION_STATUS_OK) {
 306                 ret = -1;
 307                 goto end;
 308         };
 309
 310         DBG("Serializing on event condition's capture descriptor count: %" PRIu32,
 311                         capture_descr_count);
 312         ret = lttng_dynamic_buffer_append(&payload->buffer, &capture_descr_count,
 313                         sizeof(capture_descr_count));
 314         if (ret) {
 315                 goto end;
 316         }
 317
 318         for (i = 0; i < capture_descr_count; i++) {
 319                 const struct lttng_capture_descriptor *desc =
 320                                 lttng_condition_event_rule_matches_get_internal_capture_descriptor_at_index(
 321                                                 condition, i);
 322
 323                 DBG("Serializing on event condition's capture descriptor %" PRIu32,
 324                                 i);
 325                 ret = serialize_event_expr(desc->event_expression, payload);
 326                 if (ret) {
 327                         goto end;
 328                 }
 329         }
 330
 331 end:
 332         return ret;
 333 }
 334
 335 static
 336 bool capture_descriptors_are_equal(
 337                 const struct lttng_condition *condition_a,
 338                 const struct lttng_condition *condition_b)
 339 {
 340         bool is_equal = true;
 341         unsigned int capture_descr_count_a;
 342         unsigned int capture_descr_count_b;
 343         size_t i;
 344         enum lttng_condition_status status;
 345
 346         status = lttng_condition_event_rule_matches_get_capture_descriptor_count(
 347                         condition_a, &capture_descr_count_a);
 348         if (status != LTTNG_CONDITION_STATUS_OK) {
 349                 goto not_equal;
 350         }
 351
 352         status = lttng_condition_event_rule_matches_get_capture_descriptor_count(
 353                         condition_b, &capture_descr_count_b);
 354         if (status != LTTNG_CONDITION_STATUS_OK) {
 355                 goto not_equal;
 356         }
 357
 358         if (capture_descr_count_a != capture_descr_count_b) {
 359                 goto not_equal;
 360         }
 361
 362         for (i = 0; i < capture_descr_count_a; i++) {
 363                 const struct lttng_event_expr *expr_a =
 364                                 lttng_condition_event_rule_matches_get_capture_descriptor_at_index(
 365                                                 condition_a, i);
 366                 const struct lttng_event_expr *expr_b =
 367                                 lttng_condition_event_rule_matches_get_capture_descriptor_at_index(
 368                                                 condition_b, i);
 369
 370                 if (!lttng_event_expr_is_equal(expr_a, expr_b)) {
 371                         goto not_equal;
 372                 }
 373         }
 374
 375         goto end;
 376
 377 not_equal:
 378         is_equal = false;
 379
 380 end:
 381         return is_equal;
 382 }
 383
 384 static bool lttng_condition_event_rule_matches_is_equal(
 385                 const struct lttng_condition *_a,
 386                 const struct lttng_condition *_b)
 387 {
 388         bool is_equal = false;
 389         struct lttng_condition_event_rule_matches *a, *b;
 390
 391         a = container_of(_a, struct lttng_condition_event_rule_matches, parent);
 392         b = container_of(_b, struct lttng_condition_event_rule_matches, parent);
 393
 394         /* Both event rules must be set or both must be unset. */
 395         if ((a->rule && !b->rule) || (!a->rule && b->rule)) {
 396                 WARN("Comparing event_rule conditions with uninitialized rule");
 397                 goto end;
 398         }
 399
 400         is_equal = lttng_event_rule_is_equal(a->rule, b->rule);
 401         if (!is_equal) {
 402                 goto end;
 403         }
 404
 405         is_equal = capture_descriptors_are_equal(_a, _b);
 406
 407 end:
 408         return is_equal;
 409 }
 410
 411 static void lttng_condition_event_rule_matches_destroy(
 412                 struct lttng_condition *condition)
 413 {
 414         struct lttng_condition_event_rule_matches *event_rule_matches_condition;
 415
 416         event_rule_matches_condition = container_of(condition,
 417                         struct lttng_condition_event_rule_matches, parent);
 418
 419         lttng_event_rule_put(event_rule_matches_condition->rule);
 420         lttng_dynamic_pointer_array_reset(
 421                         &event_rule_matches_condition->capture_descriptors);
 422         free(event_rule_matches_condition);
 423 }
 424
 425 static
 426 void destroy_capture_descriptor(void *ptr)
 427 {
 428         struct lttng_capture_descriptor *desc =
 429                         (struct lttng_capture_descriptor *) ptr;
 430
 431         lttng_event_expr_destroy(desc->event_expression);
 432         free(desc->bytecode);
 433         free(desc);
 434 }
 435
 436 static enum lttng_error_code lttng_condition_event_rule_matches_mi_serialize(
 437                 const struct lttng_condition *condition,
 438                 struct mi_writer *writer)
 439 {
 440         int ret;
 441         enum lttng_error_code ret_code;
 442         enum lttng_condition_status status;
 443         const struct lttng_event_rule *rule = NULL;
 444         unsigned int capture_descriptor_count, i;
 445
 446         LTTNG_ASSERT(condition);
 447         LTTNG_ASSERT(writer);
 448         LTTNG_ASSERT(IS_EVENT_RULE_MATCHES_CONDITION(condition));
 449
 450         status = lttng_condition_event_rule_matches_get_rule(condition, &rule);
 451         LTTNG_ASSERT(status == LTTNG_CONDITION_STATUS_OK);
 452         LTTNG_ASSERT(rule != NULL);
 453
 454         status = lttng_condition_event_rule_matches_get_capture_descriptor_count(
 455                         condition, &capture_descriptor_count);
 456         LTTNG_ASSERT(status == LTTNG_CONDITION_STATUS_OK);
 457
 458         /* Open condition event rule matches element. */
 459         ret = mi_lttng_writer_open_element(
 460                         writer, mi_lttng_element_condition_event_rule_matches);
 461         if (ret) {
 462                 goto mi_error;
 463         }
 464
 465         /* Serialize the event rule. */
 466         ret_code = lttng_event_rule_mi_serialize(rule, writer);
 467         if (ret_code != LTTNG_OK) {
 468                 goto end;
 469         }
 470
 471         /* Open the capture descriptors element. */
 472         ret = mi_lttng_writer_open_element(
 473                         writer, mi_lttng_element_capture_descriptors);
 474         if (ret) {
 475                 goto mi_error;
 476         }
 477
 478         for (i = 0; i < capture_descriptor_count; i++) {
 479                 const struct lttng_event_expr *descriptor = NULL;
 480
 481                 descriptor = lttng_condition_event_rule_matches_get_capture_descriptor_at_index(
 482                                 condition, i);
 483                 LTTNG_ASSERT(descriptor);
 484
 485                 ret_code = lttng_event_expr_mi_serialize(descriptor, writer);
 486                 if (ret_code != LTTNG_OK) {
 487                         goto end;
 488                 }
 489         }
 490
 491         /* Close capture descriptors element. */
 492         ret = mi_lttng_writer_close_element(writer);
 493         if (ret) {
 494                 goto mi_error;
 495         }
 496
 497         /* Close condition_event_rule_matches. */
 498         ret = mi_lttng_writer_close_element(writer);
 499         if (ret) {
 500                 goto mi_error;
 501         }
 502         ret_code = LTTNG_OK;
 503         goto end;
 504
 505 mi_error:
 506         ret_code = LTTNG_ERR_MI_IO_FAIL;
 507 end:
 508         return ret_code;
 509 }
 510
 511 struct lttng_condition *lttng_condition_event_rule_matches_create(
 512                 struct lttng_event_rule *rule)
 513 {
 514         struct lttng_condition *parent = NULL;
 515         struct lttng_condition_event_rule_matches *condition = NULL;
 516
 517         if (!rule) {
 518                 goto end;
 519         }
 520
 521         condition = (lttng_condition_event_rule_matches *) zmalloc(sizeof(struct lttng_condition_event_rule_matches));
 522         if (!condition) {
 523                 return NULL;
 524         }
 525
 526         lttng_condition_init(&condition->parent,
 527                         LTTNG_CONDITION_TYPE_EVENT_RULE_MATCHES);
 528         condition->parent.validate =
 529                         lttng_condition_event_rule_matches_validate,
 530         condition->parent.serialize =
 531                         lttng_condition_event_rule_matches_serialize,
 532         condition->parent.equal = lttng_condition_event_rule_matches_is_equal,
 533         condition->parent.destroy = lttng_condition_event_rule_matches_destroy,
 534         condition->parent.mi_serialize = lttng_condition_event_rule_matches_mi_serialize,
 535
 536         lttng_event_rule_get(rule);
 537         condition->rule = rule;
 538         rule = NULL;
 539
 540         lttng_dynamic_pointer_array_init(&condition->capture_descriptors,
 541                         destroy_capture_descriptor);
 542
 543         parent = &condition->parent;
 544 end:
 545         return parent;
 546 }
 547
 548 static
 549 uint64_t uint_from_buffer(const struct lttng_buffer_view *view, size_t size,
 550                 size_t *offset)
 551 {
 552         uint64_t ret;
 553         const struct lttng_buffer_view uint_view =
 554                         lttng_buffer_view_from_view(view, *offset, size);
 555
 556         if (!lttng_buffer_view_is_valid(&uint_view)) {
 557                 ret = UINT64_C(-1);
 558                 goto end;
 559         }
 560
 561         switch (size) {
 562         case 1:
 563                 ret = (uint64_t) *uint_view.data;
 564                 break;
 565         case sizeof(uint32_t):
 566         {
 567                 uint32_t u32;
 568
 569                 memcpy(&u32, uint_view.data, sizeof(u32));
 570                 ret = (uint64_t) u32;
 571                 break;
 572         }
 573         case sizeof(ret):
 574                 memcpy(&ret, uint_view.data, sizeof(ret));
 575                 break;
 576         default:
 577                 abort();
 578         }
 579
 580         *offset += size;
 581
 582 end:
 583         return ret;
 584 }
 585
 586 static
 587 const char *str_from_buffer(const struct lttng_buffer_view *view,
 588                 size_t *offset)
 589 {
 590         uint64_t len;
 591         const char *ret;
 592
 593         len = uint_from_buffer(view, sizeof(uint32_t), offset);
 594         if (len == UINT64_C(-1)) {
 595                 goto error;
 596         }
 597
 598         ret = &view->data[*offset];
 599
 600         if (!lttng_buffer_view_contains_string(view, ret, len)) {
 601                 goto error;
 602         }
 603
 604         *offset += len;
 605         goto end;
 606
 607 error:
 608         ret = NULL;
 609
 610 end:
 611         return ret;
 612 }
 613
 614 static
 615 struct lttng_event_expr *event_expr_from_payload(
 616                 struct lttng_payload_view *view, size_t *offset)
 617 {
 618         struct lttng_event_expr *expr = NULL;
 619         const char *str;
 620         uint64_t type;
 621
 622         type = uint_from_buffer(&view->buffer, sizeof(uint8_t), offset);
 623         if (type == UINT64_C(-1)) {
 624                 goto error;
 625         }
 626
 627         switch (type) {
 628         case LTTNG_EVENT_EXPR_TYPE_EVENT_PAYLOAD_FIELD:
 629                 str = str_from_buffer(&view->buffer, offset);
 630                 if (!str) {
 631                         goto error;
 632                 }
 633
 634                 expr = lttng_event_expr_event_payload_field_create(str);
 635                 break;
 636         case LTTNG_EVENT_EXPR_TYPE_CHANNEL_CONTEXT_FIELD:
 637                 str = str_from_buffer(&view->buffer, offset);
 638                 if (!str) {
 639                         goto error;
 640                 }
 641
 642                 expr = lttng_event_expr_channel_context_field_create(str);
 643                 break;
 644         case LTTNG_EVENT_EXPR_TYPE_APP_SPECIFIC_CONTEXT_FIELD:
 645         {
 646                 const char *provider_name;
 647                 const char *type_name;
 648
 649                 provider_name = str_from_buffer(&view->buffer, offset);
 650                 if (!provider_name) {
 651                         goto error;
 652                 }
 653
 654                 type_name = str_from_buffer(&view->buffer, offset);
 655                 if (!type_name) {
 656                         goto error;
 657                 }
 658
 659                 expr = lttng_event_expr_app_specific_context_field_create(
 660                                 provider_name, type_name);
 661                 break;
 662         }
 663         case LTTNG_EVENT_EXPR_TYPE_ARRAY_FIELD_ELEMENT:
 664         {
 665                 struct lttng_event_expr *array_field_expr;
 666                 const uint64_t index = uint_from_buffer(
 667                                 &view->buffer, sizeof(uint32_t), offset);
 668
 669                 if (index == UINT64_C(-1)) {
 670                         goto error;
 671                 }
 672
 673                 /* Array field expression is the encoded after this. */
 674                 array_field_expr = event_expr_from_payload(view, offset);
 675                 if (!array_field_expr) {
 676                         goto error;
 677                 }
 678
 679                 /* Move ownership of `array_field_expr` to new expression. */
 680                 expr = lttng_event_expr_array_field_element_create(
 681                                 array_field_expr, (unsigned int) index);
 682                 if (!expr) {
 683                         /* `array_field_expr` not moved: destroy it. */
 684                         lttng_event_expr_destroy(array_field_expr);
 685                 }
 686
 687                 break;
 688         }
 689         default:
 690                 ERR("Invalid event expression type encoutered while deserializing event expression: type = %" PRIu64,
 691                                 type);
 692                 goto error;
 693         }
 694
 695         goto end;
 696
 697 error:
 698         lttng_event_expr_destroy(expr);
 699         expr = NULL;
 700
 701 end:
 702         return expr;
 703 }
 704
 705 ssize_t lttng_condition_event_rule_matches_create_from_payload(
 706                 struct lttng_payload_view *view,
 707                 struct lttng_condition **_condition)
 708 {
 709         ssize_t consumed_length;
 710         size_t offset = 0;
 711         ssize_t event_rule_length;
 712         uint32_t i, capture_descr_count;
 713         struct lttng_condition *condition = NULL;
 714         struct lttng_event_rule *event_rule = NULL;
 715
 716         if (!view || !_condition) {
 717                 goto error;
 718         }
 719
 720         /* Struct lttng_event_rule. */
 721         {
 722                 struct lttng_payload_view event_rule_view =
 723                                 lttng_payload_view_from_view(view, offset, -1);
 724
 725                 event_rule_length = lttng_event_rule_create_from_payload(
 726                                 &event_rule_view, &event_rule);
 727         }
 728
 729         if (event_rule_length < 0 || !event_rule) {
 730                 goto error;
 731         }
 732
 733         offset += event_rule_length;
 734
 735         /* Create condition (no capture descriptors yet) at this point */
 736         condition = lttng_condition_event_rule_matches_create(event_rule);
 737         if (!condition) {
 738                 goto error;
 739         }
 740
 741         /* Capture descriptor count. */
 742         LTTNG_ASSERT(event_rule_length >= 0);
 743         capture_descr_count = uint_from_buffer(&view->buffer, sizeof(uint32_t), &offset);
 744         if (capture_descr_count == UINT32_C(-1)) {
 745                 goto error;
 746         }
 747
 748         /* Capture descriptors. */
 749         for (i = 0; i < capture_descr_count; i++) {
 750                 enum lttng_condition_status status;
 751                 struct lttng_event_expr *expr = event_expr_from_payload(
 752                                 view, &offset);
 753
 754                 if (!expr) {
 755                         goto error;
 756                 }
 757
 758                 /* Move ownership of `expr` to `condition`. */
 759                 status = lttng_condition_event_rule_matches_append_capture_descriptor(
 760                                 condition, expr);
 761                 if (status != LTTNG_CONDITION_STATUS_OK) {
 762                         /* `expr` not moved: destroy it. */
 763                         lttng_event_expr_destroy(expr);
 764                         goto error;
 765                 }
 766         }
 767
 768         consumed_length = (ssize_t) offset;
 769         *_condition = condition;
 770         condition = NULL;
 771         goto end;
 772
 773 error:
 774         consumed_length = -1;
 775
 776 end:
 777         lttng_event_rule_put(event_rule);
 778         lttng_condition_put(condition);
 779         return consumed_length;
 780 }
 781
 782 enum lttng_condition_status
 783 lttng_condition_event_rule_matches_borrow_rule_mutable(
 784                 const struct lttng_condition *condition,
 785                 struct lttng_event_rule **rule)
 786 {
 787         struct lttng_condition_event_rule_matches *event_rule;
 788         enum lttng_condition_status status = LTTNG_CONDITION_STATUS_OK;
 789
 790         if (!condition || !IS_EVENT_RULE_MATCHES_CONDITION(condition) ||
 791                         !rule) {
 792                 status = LTTNG_CONDITION_STATUS_INVALID;
 793                 goto end;
 794         }
 795
 796         event_rule = container_of(condition,
 797                         struct lttng_condition_event_rule_matches, parent);
 798         if (!event_rule->rule) {
 799                 status = LTTNG_CONDITION_STATUS_UNSET;
 800                 goto end;
 801         }
 802
 803         *rule = event_rule->rule;
 804 end:
 805         return status;
 806 }
 807
 808 enum lttng_condition_status lttng_condition_event_rule_matches_get_rule(
 809                 const struct lttng_condition *condition,
 810                 const struct lttng_event_rule **rule)
 811 {
 812         struct lttng_event_rule *mutable_rule = NULL;
 813         const enum lttng_condition_status status =
 814                         lttng_condition_event_rule_matches_borrow_rule_mutable(
 815                                         condition, &mutable_rule);
 816
 817         *rule = mutable_rule;
 818         return status;
 819 }
 820
 821 void lttng_condition_event_rule_matches_set_error_counter_index(
 822                 struct lttng_condition *condition, uint64_t error_counter_index)
 823 {
 824         struct lttng_condition_event_rule_matches *event_rule_matches_cond =
 825                         container_of(condition,
 826                                         struct lttng_condition_event_rule_matches,
 827                                         parent);
 828
 829         LTTNG_OPTIONAL_SET(&event_rule_matches_cond->error_counter_index,
 830                         error_counter_index);
 831 }
 832
 833 uint64_t lttng_condition_event_rule_matches_get_error_counter_index(
 834                 const struct lttng_condition *condition)
 835 {
 836         const struct lttng_condition_event_rule_matches
 837                         *event_rule_matches_cond = container_of(condition,
 838                                         const struct lttng_condition_event_rule_matches,
 839                                         parent);
 840
 841         return LTTNG_OPTIONAL_GET(event_rule_matches_cond->error_counter_index);
 842 }
 843
 844 enum lttng_condition_status
 845 lttng_condition_event_rule_matches_append_capture_descriptor(
 846                 struct lttng_condition *condition,
 847                 struct lttng_event_expr *expr)
 848 {
 849         int ret;
 850         enum lttng_condition_status status = LTTNG_CONDITION_STATUS_OK;
 851         struct lttng_condition_event_rule_matches *event_rule_matches_cond =
 852                         container_of(condition,
 853                                         struct lttng_condition_event_rule_matches,
 854                                         parent);
 855         struct lttng_capture_descriptor *descriptor = NULL;
 856         const struct lttng_event_rule *rule = NULL;
 857
 858         /* Only accept l-values. */
 859         if (!condition || !IS_EVENT_RULE_MATCHES_CONDITION(condition) ||
 860                         !expr || !lttng_event_expr_is_lvalue(expr)) {
 861                 status = LTTNG_CONDITION_STATUS_INVALID;
 862                 goto end;
 863         }
 864
 865         status = lttng_condition_event_rule_matches_get_rule(condition, &rule);
 866         if (status != LTTNG_CONDITION_STATUS_OK) {
 867                 goto end;
 868         }
 869
 870         switch(lttng_event_rule_get_type(rule)) {
 871         case LTTNG_EVENT_RULE_TYPE_USER_TRACEPOINT:
 872         case LTTNG_EVENT_RULE_TYPE_KERNEL_TRACEPOINT:
 873         case LTTNG_EVENT_RULE_TYPE_JUL_LOGGING:
 874         case LTTNG_EVENT_RULE_TYPE_LOG4J_LOGGING:
 875         case LTTNG_EVENT_RULE_TYPE_PYTHON_LOGGING:
 876         case LTTNG_EVENT_RULE_TYPE_KERNEL_SYSCALL:
 877                 /* Supported. */
 878                 status = LTTNG_CONDITION_STATUS_OK;
 879                 break;
 880         case LTTNG_EVENT_RULE_TYPE_UNKNOWN:
 881                 status = LTTNG_CONDITION_STATUS_INVALID;
 882                 break;
 883         default:
 884                 status = LTTNG_CONDITION_STATUS_UNSUPPORTED;
 885                 break;
 886         }
 887
 888         if (status != LTTNG_CONDITION_STATUS_OK) {
 889                 goto end;
 890         }
 891
 892         descriptor = (lttng_capture_descriptor *) malloc(sizeof(*descriptor));
 893         if (descriptor == NULL) {
 894                 status = LTTNG_CONDITION_STATUS_ERROR;
 895                 goto end;
 896         }
 897
 898         descriptor->event_expression = expr;
 899         descriptor->bytecode = NULL;
 900
 901         ret = lttng_dynamic_pointer_array_add_pointer(
 902                         &event_rule_matches_cond->capture_descriptors,
 903                         descriptor);
 904         if (ret) {
 905                 status = LTTNG_CONDITION_STATUS_ERROR;
 906                 goto end;
 907         }
 908
 909         /* Ownership is transfered to the internal capture_descriptors array */
 910         descriptor = NULL;
 911 end:
 912         free(descriptor);
 913         return status;
 914 }
 915
 916 enum lttng_condition_status
 917 lttng_condition_event_rule_matches_get_capture_descriptor_count(
 918                 const struct lttng_condition *condition, unsigned int *count)
 919 {
 920         enum lttng_condition_status status = LTTNG_CONDITION_STATUS_OK;
 921         const struct lttng_condition_event_rule_matches
 922                         *event_rule_matches_condition = container_of(condition,
 923                                         const struct lttng_condition_event_rule_matches,
 924                                         parent);
 925
 926         if (!condition || !IS_EVENT_RULE_MATCHES_CONDITION(condition) ||
 927                         !count) {
 928                 status = LTTNG_CONDITION_STATUS_INVALID;
 929                 goto end;
 930         }
 931
 932         *count = lttng_dynamic_pointer_array_get_count(
 933                         &event_rule_matches_condition->capture_descriptors);
 934
 935 end:
 936         return status;
 937 }
 938
 939 const struct lttng_event_expr *
 940 lttng_condition_event_rule_matches_get_capture_descriptor_at_index(
 941                 const struct lttng_condition *condition, unsigned int index)
 942 {
 943         const struct lttng_event_expr *expr = NULL;
 944         const struct lttng_capture_descriptor *desc = NULL;
 945
 946         desc = lttng_condition_event_rule_matches_get_internal_capture_descriptor_at_index(
 947                         condition, index);
 948         if (desc == NULL) {
 949                 goto end;
 950         }
 951         expr = desc->event_expression;
 952
 953 end:
 954         return expr;
 955 }
 956
 957 ssize_t lttng_evaluation_event_rule_matches_create_from_payload(
 958                 const struct lttng_condition_event_rule_matches *condition,
 959                 struct lttng_payload_view *view,
 960                 struct lttng_evaluation **_evaluation)
 961 {
 962         ssize_t ret, offset = 0;
 963         struct lttng_evaluation *evaluation = NULL;
 964         uint32_t capture_payload_size;
 965         const char *capture_payload = NULL;
 966
 967         if (!_evaluation) {
 968                 ret = -1;
 969                 goto error;
 970         }
 971
 972         {
 973                 const struct lttng_payload_view current_view =
 974                                 lttng_payload_view_from_view(view, offset, -1);
 975
 976                 if (current_view.buffer.size < sizeof(capture_payload_size)) {
 977                         ret = -1;
 978                         goto error;
 979                 }
 980
 981                 memcpy(&capture_payload_size, current_view.buffer.data,
 982                                 sizeof(capture_payload_size));
 983         }
 984         offset += sizeof(capture_payload_size);
 985
 986         if (capture_payload_size > 0) {
 987                 const struct lttng_payload_view current_view =
 988                                 lttng_payload_view_from_view(view, offset, -1);
 989
 990                 if (current_view.buffer.size < capture_payload_size) {
 991                         ret = -1;
 992                         goto error;
 993                 }
 994
 995                 capture_payload = current_view.buffer.data;
 996         }
 997
 998         evaluation = lttng_evaluation_event_rule_matches_create(
 999                         condition, capture_payload, capture_payload_size, true);
1000         if (!evaluation) {
1001                 ret = -1;
1002                 goto error;
1003         }
1004
1005         offset += capture_payload_size;
1006         *_evaluation = evaluation;
1007         evaluation = NULL;
1008         ret = offset;
1009
1010 error:
1011         lttng_evaluation_destroy(evaluation);
1012         return ret;
1013 }
1014
1015 static int lttng_evaluation_event_rule_matches_serialize(
1016                 const struct lttng_evaluation *evaluation,
1017                 struct lttng_payload *payload)
1018 {
1019         int ret = 0;
1020         struct lttng_evaluation_event_rule_matches *hit;
1021         uint32_t capture_payload_size;
1022
1023         hit = container_of(evaluation,
1024                         struct lttng_evaluation_event_rule_matches, parent);
1025
1026         capture_payload_size = (uint32_t) hit->capture_payload.size;
1027         ret = lttng_dynamic_buffer_append(&payload->buffer, &capture_payload_size,
1028                         sizeof(capture_payload_size));
1029         if (ret) {
1030                 goto end;
1031         }
1032
1033         ret = lttng_dynamic_buffer_append(&payload->buffer, hit->capture_payload.data,
1034                         hit->capture_payload.size);
1035         if (ret) {
1036                 goto end;
1037         }
1038
1039 end:
1040         return ret;
1041 }
1042
1043 static
1044 bool msgpack_str_is_equal(const struct msgpack_object *obj, const char *str)
1045 {
1046         bool is_equal = true;
1047
1048         LTTNG_ASSERT(obj->type == MSGPACK_OBJECT_STR);
1049
1050         if (obj->via.str.size != strlen(str)) {
1051                 is_equal = false;
1052                 goto end;
1053         }
1054
1055         if (strncmp(obj->via.str.ptr, str, obj->via.str.size) != 0) {
1056                 is_equal = false;
1057                 goto end;
1058         }
1059
1060 end:
1061         return is_equal;
1062 }
1063
1064 static
1065 const msgpack_object *get_msgpack_map_obj(const struct msgpack_object *map_obj,
1066                 const char *name)
1067 {
1068         const msgpack_object *ret = NULL;
1069         size_t i;
1070
1071         LTTNG_ASSERT(map_obj->type == MSGPACK_OBJECT_MAP);
1072
1073         for (i = 0; i < map_obj->via.map.size; i++) {
1074                 const struct msgpack_object_kv *kv = &map_obj->via.map.ptr[i];
1075
1076                 LTTNG_ASSERT(kv->key.type == MSGPACK_OBJECT_STR);
1077
1078                 if (msgpack_str_is_equal(&kv->key, name)) {
1079                         ret = &kv->val;
1080                         goto end;
1081                 }
1082         }
1083
1084 end:
1085         return ret;
1086 }
1087
1088 static void lttng_evaluation_event_rule_matches_destroy(
1089                 struct lttng_evaluation *evaluation)
1090 {
1091         struct lttng_evaluation_event_rule_matches *hit;
1092
1093         hit = container_of(evaluation,
1094                         struct lttng_evaluation_event_rule_matches, parent);
1095         lttng_dynamic_buffer_reset(&hit->capture_payload);
1096         lttng_event_field_value_destroy(hit->captured_values);
1097         free(hit);
1098 }
1099
1100 static
1101 int event_field_value_from_obj(const msgpack_object *obj,
1102                 struct lttng_event_field_value **field_val)
1103 {
1104         int ret = 0;
1105
1106         LTTNG_ASSERT(obj);
1107         LTTNG_ASSERT(field_val);
1108
1109         switch (obj->type) {
1110         case MSGPACK_OBJECT_NIL:
1111                 /* Unavailable. */
1112                 *field_val = NULL;
1113                 goto end;
1114         case MSGPACK_OBJECT_POSITIVE_INTEGER:
1115                 *field_val = lttng_event_field_value_uint_create(
1116                                 obj->via.u64);
1117                 break;
1118         case MSGPACK_OBJECT_NEGATIVE_INTEGER:
1119                 *field_val = lttng_event_field_value_int_create(
1120                                 obj->via.i64);
1121                 break;
1122         case MSGPACK_OBJECT_FLOAT32:
1123         case MSGPACK_OBJECT_FLOAT64:
1124                 *field_val = lttng_event_field_value_real_create(
1125                                 obj->via.f64);
1126                 break;
1127         case MSGPACK_OBJECT_STR:
1128                 *field_val = lttng_event_field_value_string_create_with_size(
1129                                 obj->via.str.ptr, obj->via.str.size);
1130                 break;
1131         case MSGPACK_OBJECT_ARRAY:
1132         {
1133                 size_t i;
1134
1135                 *field_val = lttng_event_field_value_array_create();
1136                 if (!*field_val) {
1137                         goto error;
1138                 }
1139
1140                 for (i = 0; i < obj->via.array.size; i++) {
1141                         const msgpack_object *elem_obj = &obj->via.array.ptr[i];
1142                         struct lttng_event_field_value *elem_field_val;
1143
1144                         ret = event_field_value_from_obj(elem_obj,
1145                                         &elem_field_val);
1146                         if (ret) {
1147                                 goto error;
1148                         }
1149
1150                         if (elem_field_val) {
1151                                 ret = lttng_event_field_value_array_append(
1152                                                 *field_val, elem_field_val);
1153                         } else {
1154                                 ret = lttng_event_field_value_array_append_unavailable(
1155                                                 *field_val);
1156                         }
1157
1158                         if (ret) {
1159                                 lttng_event_field_value_destroy(elem_field_val);
1160                                 goto error;
1161                         }
1162                 }
1163
1164                 break;
1165         }
1166         case MSGPACK_OBJECT_MAP:
1167         {
1168                 /*
1169                  * As of this version, the only valid map object is
1170                  * for an enumeration value, for example:
1171                  *
1172                  *     type: enum
1173                  *     value: 177
1174                  *     labels:
1175                  *     - Labatt 50
1176                  *     - Molson Dry
1177                  *     - Carling Black Label
1178                  */
1179                 const msgpack_object *inner_obj;
1180                 size_t label_i;
1181
1182                 inner_obj = get_msgpack_map_obj(obj, "type");
1183                 if (!inner_obj) {
1184                         ERR("Missing `type` entry in map object");
1185                         goto error;
1186                 }
1187
1188                 if (inner_obj->type != MSGPACK_OBJECT_STR) {
1189                         ERR("Map object's `type` entry is not a string: type = %s",
1190                                         msgpack_object_type_str(inner_obj->type));
1191                         goto error;
1192                 }
1193
1194                 if (!msgpack_str_is_equal(inner_obj, "enum")) {
1195                         ERR("Map object's `type` entry: expecting `enum`");
1196                         goto error;
1197                 }
1198
1199                 inner_obj = get_msgpack_map_obj(obj, "value");
1200                 if (!inner_obj) {
1201                         ERR("Missing `value` entry in map object");
1202                         goto error;
1203                 }
1204
1205                 if (inner_obj->type == MSGPACK_OBJECT_POSITIVE_INTEGER) {
1206                         *field_val = lttng_event_field_value_enum_uint_create(
1207                                         inner_obj->via.u64);
1208                 } else if (inner_obj->type == MSGPACK_OBJECT_NEGATIVE_INTEGER) {
1209                         *field_val = lttng_event_field_value_enum_int_create(
1210                                         inner_obj->via.i64);
1211                 } else {
1212                         ERR("Map object's `value` entry is not an integer: type = %s",
1213                                         msgpack_object_type_str(inner_obj->type));
1214                         goto error;
1215                 }
1216
1217                 if (!*field_val) {
1218                         goto error;
1219                 }
1220
1221                 inner_obj = get_msgpack_map_obj(obj, "labels");
1222                 if (!inner_obj) {
1223                         /* No labels */
1224                         goto end;
1225                 }
1226
1227                 if (inner_obj->type != MSGPACK_OBJECT_ARRAY) {
1228                         ERR("Map object's `labels` entry is not an array: type = %s",
1229                                         msgpack_object_type_str(inner_obj->type));
1230                         goto error;
1231                 }
1232
1233                 for (label_i = 0; label_i < inner_obj->via.array.size;
1234                                 label_i++) {
1235                         int iret;
1236                         const msgpack_object *elem_obj =
1237                                         &inner_obj->via.array.ptr[label_i];
1238
1239                         if (elem_obj->type != MSGPACK_OBJECT_STR) {
1240                                 ERR("Map object's `labels` entry's type is not a string: type = %s",
1241                                                 msgpack_object_type_str(elem_obj->type));
1242                                 goto error;
1243                         }
1244
1245                         iret = lttng_event_field_value_enum_append_label_with_size(
1246                                         *field_val, elem_obj->via.str.ptr,
1247                                         elem_obj->via.str.size);
1248                         if (iret) {
1249                                 goto error;
1250                         }
1251                 }
1252
1253                 break;
1254         }
1255         default:
1256                 ERR("Unexpected object type: type = %s",
1257                                 msgpack_object_type_str(obj->type));
1258                 goto error;
1259         }
1260
1261         if (!*field_val) {
1262                 goto error;
1263         }
1264
1265         goto end;
1266
1267 error:
1268         lttng_event_field_value_destroy(*field_val);
1269         *field_val = NULL;
1270         ret = -1;
1271
1272 end:
1273         return ret;
1274 }
1275
1276 static struct lttng_event_field_value *event_field_value_from_capture_payload(
1277                 const struct lttng_condition_event_rule_matches *condition,
1278                 const char *capture_payload,
1279                 size_t capture_payload_size)
1280 {
1281         struct lttng_event_field_value *ret = NULL;
1282         msgpack_unpacked unpacked;
1283         msgpack_unpack_return unpack_return;
1284         const msgpack_object *root_obj;
1285         const msgpack_object_array *root_array_obj;
1286         size_t i;
1287         size_t count;
1288
1289         LTTNG_ASSERT(condition);
1290         LTTNG_ASSERT(capture_payload);
1291
1292         /* Initialize value. */
1293         msgpack_unpacked_init(&unpacked);
1294
1295         /* Decode. */
1296         unpack_return = msgpack_unpack_next(&unpacked, capture_payload,
1297                         capture_payload_size, NULL);
1298         if (unpack_return != MSGPACK_UNPACK_SUCCESS) {
1299                 ERR("msgpack_unpack_next() failed to decode the "
1300                                 "MessagePack-encoded capture payload: "
1301                                 "size = %zu, ret = %d",
1302                                 capture_payload_size, unpack_return);
1303                 goto error;
1304         }
1305
1306         /* Get root array. */
1307         root_obj = &unpacked.data;
1308
1309         if (root_obj->type != MSGPACK_OBJECT_ARRAY) {
1310                 ERR("Expecting an array as the root object: type = %s",
1311                                 msgpack_object_type_str(root_obj->type));
1312                 goto error;
1313         }
1314
1315         root_array_obj = &root_obj->via.array;
1316
1317         /* Create an empty root array event field value. */
1318         ret = lttng_event_field_value_array_create();
1319         if (!ret) {
1320                 goto error;
1321         }
1322
1323         /*
1324          * For each capture descriptor in the condition object:
1325          *
1326          * 1. Get its corresponding captured field value MessagePack
1327          *    object.
1328          *
1329          * 2. Create a corresponding event field value.
1330          *
1331          * 3. Append it to `ret` (the root array event field value).
1332          */
1333         count = lttng_dynamic_pointer_array_get_count(
1334                         &condition->capture_descriptors);
1335         LTTNG_ASSERT(count > 0);
1336
1337         for (i = 0; i < count; i++) {
1338                 const struct lttng_capture_descriptor *capture_descriptor =
1339                                 lttng_condition_event_rule_matches_get_internal_capture_descriptor_at_index(
1340                                                 &condition->parent, i);
1341                 const msgpack_object *elem_obj;
1342                 struct lttng_event_field_value *elem_field_val;
1343                 int iret;
1344
1345                 LTTNG_ASSERT(capture_descriptor);
1346
1347                 elem_obj = &root_array_obj->ptr[i];
1348                 iret = event_field_value_from_obj(elem_obj,
1349                                 &elem_field_val);
1350                 if (iret) {
1351                         goto error;
1352                 }
1353
1354                 if (elem_field_val) {
1355                         iret = lttng_event_field_value_array_append(ret,
1356                                         elem_field_val);
1357                 } else {
1358                         iret = lttng_event_field_value_array_append_unavailable(
1359                                         ret);
1360                 }
1361
1362                 if (iret) {
1363                         lttng_event_field_value_destroy(elem_field_val);
1364                         goto error;
1365                 }
1366         }
1367
1368         goto end;
1369
1370 error:
1371         lttng_event_field_value_destroy(ret);
1372         ret = NULL;
1373
1374 end:
1375         msgpack_unpacked_destroy(&unpacked);
1376         return ret;
1377 }
1378
1379 struct lttng_evaluation *lttng_evaluation_event_rule_matches_create(
1380                 const struct lttng_condition_event_rule_matches *condition,
1381                 const char *capture_payload,
1382                 size_t capture_payload_size,
1383                 bool decode_capture_payload)
1384 {
1385         struct lttng_evaluation_event_rule_matches *hit;
1386         struct lttng_evaluation *evaluation = NULL;
1387
1388         hit = (lttng_evaluation_event_rule_matches *) zmalloc(sizeof(struct lttng_evaluation_event_rule_matches));
1389         if (!hit) {
1390                 goto error;
1391         }
1392
1393         lttng_dynamic_buffer_init(&hit->capture_payload);
1394
1395         if (capture_payload) {
1396                 const int ret = lttng_dynamic_buffer_append(
1397                                 &hit->capture_payload, capture_payload,
1398                                 capture_payload_size);
1399                 if (ret) {
1400                         ERR("Failed to initialize capture payload of event rule evaluation");
1401                         goto error;
1402                 }
1403
1404                 if (decode_capture_payload) {
1405                         hit->captured_values =
1406                                         event_field_value_from_capture_payload(
1407                                                 condition,
1408                                                 capture_payload,
1409                                                 capture_payload_size);
1410                         if (!hit->captured_values) {
1411                                 ERR("Failed to decode the capture payload: size = %zu",
1412                                                 capture_payload_size);
1413                                 goto error;
1414                         }
1415                 }
1416         }
1417
1418         hit->parent.type = LTTNG_CONDITION_TYPE_EVENT_RULE_MATCHES;
1419         hit->parent.serialize = lttng_evaluation_event_rule_matches_serialize;
1420         hit->parent.destroy = lttng_evaluation_event_rule_matches_destroy;
1421
1422         evaluation = &hit->parent;
1423         hit = NULL;
1424
1425 error:
1426         if (hit) {
1427                 lttng_evaluation_event_rule_matches_destroy(&hit->parent);
1428         }
1429
1430         return evaluation;
1431 }
1432
1433 enum lttng_evaluation_event_rule_matches_status
1434 lttng_evaluation_event_rule_matches_get_captured_values(
1435                 const struct lttng_evaluation *evaluation,
1436                 const struct lttng_event_field_value **field_val)
1437 {
1438         struct lttng_evaluation_event_rule_matches *hit;
1439         enum lttng_evaluation_event_rule_matches_status status =
1440                         LTTNG_EVALUATION_EVENT_RULE_MATCHES_STATUS_OK;
1441
1442         if (!evaluation || !is_event_rule_matches_evaluation(evaluation) ||
1443                         !field_val) {
1444                 status = LTTNG_EVALUATION_EVENT_RULE_MATCHES_STATUS_INVALID;
1445                 goto end;
1446         }
1447
1448         hit = container_of(evaluation,
1449                         struct lttng_evaluation_event_rule_matches, parent);
1450         if (!hit->captured_values) {
1451                 status = LTTNG_EVALUATION_EVENT_RULE_MATCHES_STATUS_NONE;
1452                 goto end;
1453         }
1454
1455         *field_val = hit->captured_values;
1456
1457 end:
1458         return status;
1459 }
1460
1461 enum lttng_error_code
1462 lttng_condition_event_rule_matches_generate_capture_descriptor_bytecode(
1463                 struct lttng_condition *condition)
1464 {
1465         enum lttng_error_code ret;
1466         enum lttng_condition_status status;
1467         unsigned int capture_count, i;
1468
1469         if (!condition || !IS_EVENT_RULE_MATCHES_CONDITION(condition)) {
1470                 ret = LTTNG_ERR_FATAL;
1471                 goto end;
1472         }
1473
1474         status = lttng_condition_event_rule_matches_get_capture_descriptor_count(
1475                         condition, &capture_count);
1476         if (status != LTTNG_CONDITION_STATUS_OK) {
1477                 ret = LTTNG_ERR_FATAL;
1478                 goto end;
1479         }
1480
1481         for (i = 0; i < capture_count; i++) {
1482                 struct lttng_capture_descriptor *local_capture_desc =
1483                                 lttng_condition_event_rule_matches_get_internal_capture_descriptor_at_index(
1484                                                 condition, i);
1485                 int bytecode_ret;
1486
1487                 if (local_capture_desc == NULL) {
1488                         ret = LTTNG_ERR_FATAL;
1489                         goto end;
1490                 }
1491
1492                 /* Generate the bytecode. */
1493                 bytecode_ret = lttng_event_expr_to_bytecode(
1494                                 local_capture_desc->event_expression,
1495                                 &local_capture_desc->bytecode);
1496                 if (bytecode_ret < 0 || local_capture_desc->bytecode == NULL) {
1497                         ret = LTTNG_ERR_INVALID_CAPTURE_EXPRESSION;
1498                         goto end;
1499                 }
1500         }
1501
1502         /* Everything went better than expected */
1503         ret = LTTNG_OK;
1504
1505 end:
1506         return ret;
1507 }
1508
1509 const struct lttng_bytecode *
1510 lttng_condition_event_rule_matches_get_capture_bytecode_at_index(
1511                 const struct lttng_condition *condition, unsigned int index)
1512 {
1513         const struct lttng_condition_event_rule_matches
1514                         *event_rule_matches_cond = container_of(condition,
1515                                         const struct lttng_condition_event_rule_matches,
1516                                         parent);
1517         struct lttng_capture_descriptor *desc = NULL;
1518         struct lttng_bytecode *bytecode = NULL;
1519         unsigned int count;
1520         enum lttng_condition_status status;
1521
1522         if (!condition || !IS_EVENT_RULE_MATCHES_CONDITION(condition)) {
1523                 goto end;
1524         }
1525
1526         status = lttng_condition_event_rule_matches_get_capture_descriptor_count(
1527                         condition, &count);
1528         if (status != LTTNG_CONDITION_STATUS_OK) {
1529                 goto end;
1530         }
1531
1532         if (index >= count) {
1533                 goto end;
1534         }
1535
1536         desc = (lttng_capture_descriptor *) lttng_dynamic_pointer_array_get_pointer(
1537                         &event_rule_matches_cond->capture_descriptors, index);
1538         if (desc == NULL) {
1539                 goto end;
1540         }
1541
1542         bytecode = desc->bytecode;
1543 end:
1544         return bytecode;
1545 }