| 1 | /* |
| 2 | * Copyright (C) 2017 Jérémie Galarneau <jeremie.galarneau@efficios.com> |
| 3 | * |
| 4 | * SPDX-License-Identifier: LGPL-2.1-only |
| 5 | * |
| 6 | */ |
| 7 | |
| 8 | #include <lttng/trigger/trigger-internal.h> |
| 9 | #include <lttng/condition/condition-internal.h> |
| 10 | #include <lttng/action/action-internal.h> |
| 11 | #include <common/credentials.h> |
| 12 | #include <common/payload.h> |
| 13 | #include <common/payload-view.h> |
| 14 | #include <common/error.h> |
| 15 | #include <common/dynamic-array.h> |
| 16 | #include <common/optional.h> |
| 17 | #include <assert.h> |
| 18 | #include <inttypes.h> |
| 19 | |
| 20 | LTTNG_HIDDEN |
| 21 | bool lttng_trigger_validate(struct lttng_trigger *trigger) |
| 22 | { |
| 23 | bool valid; |
| 24 | |
| 25 | if (!trigger) { |
| 26 | valid = false; |
| 27 | goto end; |
| 28 | } |
| 29 | |
| 30 | if (!trigger->creds.uid.is_set) { |
| 31 | valid = false; |
| 32 | goto end; |
| 33 | } |
| 34 | |
| 35 | valid = lttng_condition_validate(trigger->condition) && |
| 36 | lttng_action_validate(trigger->action); |
| 37 | end: |
| 38 | return valid; |
| 39 | } |
| 40 | |
| 41 | struct lttng_trigger *lttng_trigger_create( |
| 42 | struct lttng_condition *condition, |
| 43 | struct lttng_action *action) |
| 44 | { |
| 45 | struct lttng_trigger *trigger = NULL; |
| 46 | |
| 47 | if (!condition || !action) { |
| 48 | goto end; |
| 49 | } |
| 50 | |
| 51 | trigger = zmalloc(sizeof(struct lttng_trigger)); |
| 52 | if (!trigger) { |
| 53 | goto end; |
| 54 | } |
| 55 | |
| 56 | urcu_ref_init(&trigger->ref); |
| 57 | |
| 58 | lttng_condition_get(condition); |
| 59 | trigger->condition = condition; |
| 60 | |
| 61 | lttng_action_get(action); |
| 62 | trigger->action = action; |
| 63 | |
| 64 | end: |
| 65 | return trigger; |
| 66 | } |
| 67 | |
| 68 | /* |
| 69 | * Note: the lack of reference counting 'get' on the condition object is normal. |
| 70 | * This API was exposed as such in 2.11. The client is not expected to call |
| 71 | * lttng_condition_destroy on the returned object. |
| 72 | */ |
| 73 | struct lttng_condition *lttng_trigger_get_condition( |
| 74 | struct lttng_trigger *trigger) |
| 75 | { |
| 76 | return trigger ? trigger->condition : NULL; |
| 77 | } |
| 78 | |
| 79 | LTTNG_HIDDEN |
| 80 | const struct lttng_condition *lttng_trigger_get_const_condition( |
| 81 | const struct lttng_trigger *trigger) |
| 82 | { |
| 83 | return trigger->condition; |
| 84 | } |
| 85 | |
| 86 | |
| 87 | /* |
| 88 | * Note: the lack of reference counting 'get' on the action object is normal. |
| 89 | * This API was exposed as such in 2.11. The client is not expected to call |
| 90 | * lttng_action_destroy on the returned object. |
| 91 | */ |
| 92 | struct lttng_action *lttng_trigger_get_action( |
| 93 | struct lttng_trigger *trigger) |
| 94 | { |
| 95 | return trigger ? trigger->action : NULL; |
| 96 | } |
| 97 | |
| 98 | LTTNG_HIDDEN |
| 99 | const struct lttng_action *lttng_trigger_get_const_action( |
| 100 | const struct lttng_trigger *trigger) |
| 101 | { |
| 102 | return trigger->action; |
| 103 | } |
| 104 | |
| 105 | static void trigger_destroy_ref(struct urcu_ref *ref) |
| 106 | { |
| 107 | struct lttng_trigger *trigger = |
| 108 | container_of(ref, struct lttng_trigger, ref); |
| 109 | struct lttng_action *action = lttng_trigger_get_action(trigger); |
| 110 | struct lttng_condition *condition = |
| 111 | lttng_trigger_get_condition(trigger); |
| 112 | |
| 113 | assert(action); |
| 114 | assert(condition); |
| 115 | |
| 116 | /* Release ownership. */ |
| 117 | lttng_action_put(action); |
| 118 | lttng_condition_put(condition); |
| 119 | |
| 120 | free(trigger->name); |
| 121 | free(trigger); |
| 122 | } |
| 123 | |
| 124 | void lttng_trigger_destroy(struct lttng_trigger *trigger) |
| 125 | { |
| 126 | lttng_trigger_put(trigger); |
| 127 | } |
| 128 | |
| 129 | LTTNG_HIDDEN |
| 130 | ssize_t lttng_trigger_create_from_payload( |
| 131 | struct lttng_payload_view *src_view, |
| 132 | struct lttng_trigger **trigger) |
| 133 | { |
| 134 | ssize_t ret, offset = 0, condition_size, action_size, name_size = 0; |
| 135 | struct lttng_condition *condition = NULL; |
| 136 | struct lttng_action *action = NULL; |
| 137 | const struct lttng_trigger_comm *trigger_comm; |
| 138 | const char *name = NULL; |
| 139 | struct lttng_credentials creds = { |
| 140 | .uid = LTTNG_OPTIONAL_INIT_UNSET, |
| 141 | .gid = LTTNG_OPTIONAL_INIT_UNSET, |
| 142 | }; |
| 143 | |
| 144 | if (!src_view || !trigger) { |
| 145 | ret = -1; |
| 146 | goto end; |
| 147 | } |
| 148 | |
| 149 | /* lttng_trigger_comm header */ |
| 150 | trigger_comm = (typeof(trigger_comm)) src_view->buffer.data; |
| 151 | |
| 152 | /* Set the trigger's creds. */ |
| 153 | if (trigger_comm->uid > (uint64_t) ((uid_t) -1)) { |
| 154 | /* UID out of range for this platform. */ |
| 155 | ret = -1; |
| 156 | goto end; |
| 157 | } |
| 158 | |
| 159 | LTTNG_OPTIONAL_SET(&creds.uid, trigger_comm->uid); |
| 160 | |
| 161 | offset += sizeof(*trigger_comm); |
| 162 | |
| 163 | if (trigger_comm->name_length != 0) { |
| 164 | /* Name. */ |
| 165 | const struct lttng_payload_view name_view = |
| 166 | lttng_payload_view_from_view( |
| 167 | src_view, offset, trigger_comm->name_length); |
| 168 | |
| 169 | name = name_view.buffer.data; |
| 170 | if (!lttng_buffer_view_contains_string(&name_view.buffer, name, |
| 171 | trigger_comm->name_length)) { |
| 172 | ret = -1; |
| 173 | goto end; |
| 174 | } |
| 175 | |
| 176 | offset += trigger_comm->name_length; |
| 177 | name_size = trigger_comm->name_length; |
| 178 | } |
| 179 | |
| 180 | { |
| 181 | /* struct lttng_condition */ |
| 182 | struct lttng_payload_view condition_view = |
| 183 | lttng_payload_view_from_view( |
| 184 | src_view, offset, -1); |
| 185 | |
| 186 | condition_size = lttng_condition_create_from_payload(&condition_view, |
| 187 | &condition); |
| 188 | } |
| 189 | |
| 190 | if (condition_size < 0) { |
| 191 | ret = condition_size; |
| 192 | goto end; |
| 193 | } |
| 194 | |
| 195 | offset += condition_size; |
| 196 | { |
| 197 | /* struct lttng_action */ |
| 198 | struct lttng_payload_view action_view = |
| 199 | lttng_payload_view_from_view( |
| 200 | src_view, offset, -1); |
| 201 | |
| 202 | action_size = lttng_action_create_from_payload(&action_view, &action); |
| 203 | } |
| 204 | |
| 205 | if (action_size < 0) { |
| 206 | ret = action_size; |
| 207 | goto end; |
| 208 | } |
| 209 | offset += action_size; |
| 210 | |
| 211 | /* Unexpected size of inner-elements; the buffer is corrupted. */ |
| 212 | if ((ssize_t) trigger_comm->length != condition_size + action_size + name_size) { |
| 213 | ret = -1; |
| 214 | goto error; |
| 215 | } |
| 216 | |
| 217 | *trigger = lttng_trigger_create(condition, action); |
| 218 | if (!*trigger) { |
| 219 | ret = -1; |
| 220 | goto error; |
| 221 | } |
| 222 | |
| 223 | lttng_trigger_set_credentials(*trigger, &creds); |
| 224 | |
| 225 | /* |
| 226 | * The trigger object owns references to the action and condition |
| 227 | * objects. |
| 228 | */ |
| 229 | lttng_condition_put(condition); |
| 230 | condition = NULL; |
| 231 | |
| 232 | lttng_action_put(action); |
| 233 | action = NULL; |
| 234 | |
| 235 | if (name) { |
| 236 | const enum lttng_trigger_status status = |
| 237 | lttng_trigger_set_name(*trigger, name); |
| 238 | |
| 239 | if (status != LTTNG_TRIGGER_STATUS_OK) { |
| 240 | ret = -1; |
| 241 | goto end; |
| 242 | } |
| 243 | } |
| 244 | |
| 245 | ret = offset; |
| 246 | |
| 247 | error: |
| 248 | lttng_condition_destroy(condition); |
| 249 | lttng_action_destroy(action); |
| 250 | end: |
| 251 | return ret; |
| 252 | } |
| 253 | |
| 254 | /* |
| 255 | * Both elements are stored contiguously, see their "*_comm" structure |
| 256 | * for the detailed format. |
| 257 | */ |
| 258 | LTTNG_HIDDEN |
| 259 | int lttng_trigger_serialize(const struct lttng_trigger *trigger, |
| 260 | struct lttng_payload *payload) |
| 261 | { |
| 262 | int ret; |
| 263 | size_t header_offset, size_before_payload, size_name; |
| 264 | struct lttng_trigger_comm trigger_comm = {}; |
| 265 | struct lttng_trigger_comm *header; |
| 266 | const struct lttng_credentials *creds = NULL; |
| 267 | |
| 268 | creds = lttng_trigger_get_credentials(trigger); |
| 269 | assert(creds); |
| 270 | |
| 271 | trigger_comm.uid = LTTNG_OPTIONAL_GET(creds->uid); |
| 272 | |
| 273 | if (trigger->name != NULL) { |
| 274 | size_name = strlen(trigger->name) + 1; |
| 275 | } else { |
| 276 | size_name = 0; |
| 277 | } |
| 278 | |
| 279 | trigger_comm.name_length = size_name; |
| 280 | |
| 281 | header_offset = payload->buffer.size; |
| 282 | ret = lttng_dynamic_buffer_append(&payload->buffer, &trigger_comm, |
| 283 | sizeof(trigger_comm)); |
| 284 | if (ret) { |
| 285 | goto end; |
| 286 | } |
| 287 | |
| 288 | size_before_payload = payload->buffer.size; |
| 289 | |
| 290 | /* Trigger name. */ |
| 291 | ret = lttng_dynamic_buffer_append( |
| 292 | &payload->buffer, trigger->name, size_name); |
| 293 | if (ret) { |
| 294 | goto end; |
| 295 | } |
| 296 | |
| 297 | ret = lttng_condition_serialize(trigger->condition, payload); |
| 298 | if (ret) { |
| 299 | goto end; |
| 300 | } |
| 301 | |
| 302 | ret = lttng_action_serialize(trigger->action, payload); |
| 303 | if (ret) { |
| 304 | goto end; |
| 305 | } |
| 306 | |
| 307 | /* Update payload size. */ |
| 308 | header = (typeof(header)) (payload->buffer.data + header_offset); |
| 309 | header->length = payload->buffer.size - size_before_payload; |
| 310 | end: |
| 311 | return ret; |
| 312 | } |
| 313 | |
| 314 | LTTNG_HIDDEN |
| 315 | bool lttng_trigger_is_equal( |
| 316 | const struct lttng_trigger *a, const struct lttng_trigger *b) |
| 317 | { |
| 318 | /* |
| 319 | * Name is not taken into account since it is cosmetic only. |
| 320 | */ |
| 321 | if (!lttng_condition_is_equal(a->condition, b->condition)) { |
| 322 | return false; |
| 323 | } |
| 324 | |
| 325 | if (!lttng_action_is_equal(a->action, b->action)) { |
| 326 | return false; |
| 327 | } |
| 328 | |
| 329 | if (!lttng_credentials_is_equal(lttng_trigger_get_credentials(a), |
| 330 | lttng_trigger_get_credentials(b))) { |
| 331 | return false; |
| 332 | } |
| 333 | |
| 334 | return true; |
| 335 | } |
| 336 | |
| 337 | enum lttng_trigger_status lttng_trigger_set_name(struct lttng_trigger *trigger, |
| 338 | const char* name) |
| 339 | { |
| 340 | char *name_copy = NULL; |
| 341 | enum lttng_trigger_status status = LTTNG_TRIGGER_STATUS_OK; |
| 342 | |
| 343 | if (!trigger || !name || |
| 344 | strlen(name) == 0) { |
| 345 | status = LTTNG_TRIGGER_STATUS_INVALID; |
| 346 | goto end; |
| 347 | } |
| 348 | |
| 349 | name_copy = strdup(name); |
| 350 | if (!name_copy) { |
| 351 | status = LTTNG_TRIGGER_STATUS_ERROR; |
| 352 | goto end; |
| 353 | } |
| 354 | |
| 355 | free(trigger->name); |
| 356 | |
| 357 | trigger->name = name_copy; |
| 358 | name_copy = NULL; |
| 359 | end: |
| 360 | return status; |
| 361 | } |
| 362 | |
| 363 | enum lttng_trigger_status lttng_trigger_get_name( |
| 364 | const struct lttng_trigger *trigger, const char **name) |
| 365 | { |
| 366 | enum lttng_trigger_status status = LTTNG_TRIGGER_STATUS_OK; |
| 367 | |
| 368 | if (!trigger || !name) { |
| 369 | status = LTTNG_TRIGGER_STATUS_INVALID; |
| 370 | goto end; |
| 371 | } |
| 372 | |
| 373 | if (!trigger->name) { |
| 374 | status = LTTNG_TRIGGER_STATUS_UNSET; |
| 375 | } |
| 376 | |
| 377 | *name = trigger->name; |
| 378 | end: |
| 379 | return status; |
| 380 | } |
| 381 | |
| 382 | LTTNG_HIDDEN |
| 383 | int lttng_trigger_assign_name(struct lttng_trigger *dst, |
| 384 | const struct lttng_trigger *src) |
| 385 | { |
| 386 | int ret = 0; |
| 387 | enum lttng_trigger_status status; |
| 388 | |
| 389 | status = lttng_trigger_set_name(dst, src->name); |
| 390 | if (status != LTTNG_TRIGGER_STATUS_OK) { |
| 391 | ret = -1; |
| 392 | ERR("Failed to set name for trigger"); |
| 393 | goto end; |
| 394 | } |
| 395 | end: |
| 396 | return ret; |
| 397 | } |
| 398 | |
| 399 | LTTNG_HIDDEN |
| 400 | void lttng_trigger_set_tracer_token(struct lttng_trigger *trigger, |
| 401 | uint64_t token) |
| 402 | { |
| 403 | assert(trigger); |
| 404 | LTTNG_OPTIONAL_SET(&trigger->tracer_token, token); |
| 405 | } |
| 406 | |
| 407 | LTTNG_HIDDEN |
| 408 | uint64_t lttng_trigger_get_tracer_token(const struct lttng_trigger *trigger) |
| 409 | { |
| 410 | assert(trigger); |
| 411 | |
| 412 | return LTTNG_OPTIONAL_GET(trigger->tracer_token); |
| 413 | } |
| 414 | |
| 415 | LTTNG_HIDDEN |
| 416 | int lttng_trigger_generate_name(struct lttng_trigger *trigger, |
| 417 | uint64_t unique_id) |
| 418 | { |
| 419 | int ret = 0; |
| 420 | char *generated_name = NULL; |
| 421 | |
| 422 | ret = asprintf(&generated_name, "T%" PRIu64 "", unique_id); |
| 423 | if (ret < 0) { |
| 424 | ERR("Failed to generate trigger name"); |
| 425 | ret = -1; |
| 426 | goto end; |
| 427 | } |
| 428 | |
| 429 | ret = 0; |
| 430 | free(trigger->name); |
| 431 | trigger->name = generated_name; |
| 432 | end: |
| 433 | return ret; |
| 434 | } |
| 435 | |
| 436 | LTTNG_HIDDEN |
| 437 | void lttng_trigger_get(struct lttng_trigger *trigger) |
| 438 | { |
| 439 | urcu_ref_get(&trigger->ref); |
| 440 | } |
| 441 | |
| 442 | LTTNG_HIDDEN |
| 443 | void lttng_trigger_put(struct lttng_trigger *trigger) |
| 444 | { |
| 445 | if (!trigger) { |
| 446 | return; |
| 447 | } |
| 448 | |
| 449 | urcu_ref_put(&trigger->ref , trigger_destroy_ref); |
| 450 | } |
| 451 | |
| 452 | static void delete_trigger_array_element(void *ptr) |
| 453 | { |
| 454 | struct lttng_trigger *trigger = ptr; |
| 455 | |
| 456 | lttng_trigger_put(trigger); |
| 457 | } |
| 458 | |
| 459 | LTTNG_HIDDEN |
| 460 | struct lttng_triggers *lttng_triggers_create(void) |
| 461 | { |
| 462 | struct lttng_triggers *triggers = NULL; |
| 463 | |
| 464 | triggers = zmalloc(sizeof(*triggers)); |
| 465 | if (!triggers) { |
| 466 | goto end; |
| 467 | } |
| 468 | |
| 469 | lttng_dynamic_pointer_array_init(&triggers->array, delete_trigger_array_element); |
| 470 | |
| 471 | end: |
| 472 | return triggers; |
| 473 | } |
| 474 | |
| 475 | LTTNG_HIDDEN |
| 476 | struct lttng_trigger *lttng_triggers_borrow_mutable_at_index( |
| 477 | const struct lttng_triggers *triggers, unsigned int index) |
| 478 | { |
| 479 | struct lttng_trigger *trigger = NULL; |
| 480 | |
| 481 | assert(triggers); |
| 482 | if (index >= lttng_dynamic_pointer_array_get_count(&triggers->array)) { |
| 483 | goto end; |
| 484 | } |
| 485 | |
| 486 | trigger = (struct lttng_trigger *) |
| 487 | lttng_dynamic_pointer_array_get_pointer( |
| 488 | &triggers->array, index); |
| 489 | end: |
| 490 | return trigger; |
| 491 | } |
| 492 | |
| 493 | LTTNG_HIDDEN |
| 494 | int lttng_triggers_add( |
| 495 | struct lttng_triggers *triggers, struct lttng_trigger *trigger) |
| 496 | { |
| 497 | int ret; |
| 498 | |
| 499 | assert(triggers); |
| 500 | assert(trigger); |
| 501 | |
| 502 | lttng_trigger_get(trigger); |
| 503 | |
| 504 | ret = lttng_dynamic_pointer_array_add_pointer(&triggers->array, trigger); |
| 505 | if (ret) { |
| 506 | lttng_trigger_put(trigger); |
| 507 | } |
| 508 | |
| 509 | return ret; |
| 510 | } |
| 511 | |
| 512 | const struct lttng_trigger *lttng_triggers_get_at_index( |
| 513 | const struct lttng_triggers *triggers, unsigned int index) |
| 514 | { |
| 515 | return lttng_triggers_borrow_mutable_at_index(triggers, index); |
| 516 | } |
| 517 | |
| 518 | enum lttng_trigger_status lttng_triggers_get_count(const struct lttng_triggers *triggers, unsigned int *count) |
| 519 | { |
| 520 | enum lttng_trigger_status status = LTTNG_TRIGGER_STATUS_OK; |
| 521 | |
| 522 | if (!triggers || !count) { |
| 523 | status = LTTNG_TRIGGER_STATUS_INVALID; |
| 524 | goto end; |
| 525 | } |
| 526 | |
| 527 | *count = lttng_dynamic_pointer_array_get_count(&triggers->array); |
| 528 | end: |
| 529 | return status; |
| 530 | } |
| 531 | |
| 532 | void lttng_triggers_destroy(struct lttng_triggers *triggers) |
| 533 | { |
| 534 | if (!triggers) { |
| 535 | return; |
| 536 | } |
| 537 | |
| 538 | lttng_dynamic_pointer_array_reset(&triggers->array); |
| 539 | free(triggers); |
| 540 | } |
| 541 | |
| 542 | int lttng_triggers_serialize(const struct lttng_triggers *triggers, |
| 543 | struct lttng_payload *payload) |
| 544 | { |
| 545 | int ret; |
| 546 | unsigned int i, count; |
| 547 | size_t size_before_payload; |
| 548 | struct lttng_triggers_comm triggers_comm = {}; |
| 549 | struct lttng_triggers_comm *header; |
| 550 | enum lttng_trigger_status status; |
| 551 | const size_t header_offset = payload->buffer.size; |
| 552 | |
| 553 | status = lttng_triggers_get_count(triggers, &count); |
| 554 | if (status != LTTNG_TRIGGER_STATUS_OK) { |
| 555 | ret = LTTNG_ERR_INVALID; |
| 556 | goto end; |
| 557 | } |
| 558 | |
| 559 | triggers_comm.count = count; |
| 560 | |
| 561 | /* Placeholder header; updated at the end. */ |
| 562 | ret = lttng_dynamic_buffer_append(&payload->buffer, &triggers_comm, |
| 563 | sizeof(triggers_comm)); |
| 564 | if (ret) { |
| 565 | goto end; |
| 566 | } |
| 567 | |
| 568 | size_before_payload = payload->buffer.size; |
| 569 | |
| 570 | for (i = 0; i < count; i++) { |
| 571 | const struct lttng_trigger *trigger = |
| 572 | lttng_triggers_get_at_index(triggers, i); |
| 573 | |
| 574 | assert(trigger); |
| 575 | |
| 576 | ret = lttng_trigger_serialize(trigger, payload); |
| 577 | if (ret) { |
| 578 | goto end; |
| 579 | } |
| 580 | } |
| 581 | |
| 582 | /* Update payload size. */ |
| 583 | header = (struct lttng_triggers_comm *) ((char *) payload->buffer.data + header_offset); |
| 584 | header->length = payload->buffer.size - size_before_payload; |
| 585 | end: |
| 586 | return ret; |
| 587 | } |
| 588 | |
| 589 | LTTNG_HIDDEN |
| 590 | ssize_t lttng_triggers_create_from_payload( |
| 591 | struct lttng_payload_view *src_view, |
| 592 | struct lttng_triggers **triggers) |
| 593 | { |
| 594 | ssize_t ret, offset = 0, triggers_size = 0; |
| 595 | unsigned int i; |
| 596 | const struct lttng_triggers_comm *triggers_comm; |
| 597 | struct lttng_triggers *local_triggers = NULL; |
| 598 | |
| 599 | if (!src_view || !triggers) { |
| 600 | ret = -1; |
| 601 | goto error; |
| 602 | } |
| 603 | |
| 604 | /* lttng_trigger_comms header */ |
| 605 | triggers_comm = (const struct lttng_triggers_comm *) src_view->buffer.data; |
| 606 | offset += sizeof(*triggers_comm); |
| 607 | |
| 608 | local_triggers = lttng_triggers_create(); |
| 609 | if (!local_triggers) { |
| 610 | ret = -1; |
| 611 | goto error; |
| 612 | } |
| 613 | |
| 614 | for (i = 0; i < triggers_comm->count; i++) { |
| 615 | struct lttng_trigger *trigger = NULL; |
| 616 | struct lttng_payload_view trigger_view = |
| 617 | lttng_payload_view_from_view(src_view, offset, -1); |
| 618 | ssize_t trigger_size; |
| 619 | |
| 620 | trigger_size = lttng_trigger_create_from_payload( |
| 621 | &trigger_view, &trigger); |
| 622 | if (trigger_size < 0) { |
| 623 | ret = trigger_size; |
| 624 | goto error; |
| 625 | } |
| 626 | |
| 627 | /* Transfer ownership of the trigger to the collection. */ |
| 628 | ret = lttng_triggers_add(local_triggers, trigger); |
| 629 | lttng_trigger_put(trigger); |
| 630 | if (ret < 0) { |
| 631 | ret = -1; |
| 632 | goto error; |
| 633 | } |
| 634 | |
| 635 | offset += trigger_size; |
| 636 | triggers_size += trigger_size; |
| 637 | } |
| 638 | |
| 639 | /* Unexpected size of inner-elements; the buffer is corrupted. */ |
| 640 | if ((ssize_t) triggers_comm->length != triggers_size) { |
| 641 | ret = -1; |
| 642 | goto error; |
| 643 | } |
| 644 | |
| 645 | /* Pass ownership to caller. */ |
| 646 | *triggers = local_triggers; |
| 647 | local_triggers = NULL; |
| 648 | |
| 649 | ret = offset; |
| 650 | error: |
| 651 | |
| 652 | lttng_triggers_destroy(local_triggers); |
| 653 | return ret; |
| 654 | } |
| 655 | |
| 656 | LTTNG_HIDDEN |
| 657 | const struct lttng_credentials *lttng_trigger_get_credentials( |
| 658 | const struct lttng_trigger *trigger) |
| 659 | { |
| 660 | return &trigger->creds; |
| 661 | } |
| 662 | |
| 663 | LTTNG_HIDDEN |
| 664 | void lttng_trigger_set_credentials(struct lttng_trigger *trigger, |
| 665 | const struct lttng_credentials *creds) |
| 666 | { |
| 667 | assert(creds); |
| 668 | trigger->creds = *creds; |
| 669 | } |
| 670 | |
| 671 | enum lttng_trigger_status lttng_trigger_set_owner_uid( |
| 672 | struct lttng_trigger *trigger, uid_t uid) |
| 673 | { |
| 674 | enum lttng_trigger_status ret = LTTNG_TRIGGER_STATUS_OK; |
| 675 | const struct lttng_credentials creds = { |
| 676 | .uid = LTTNG_OPTIONAL_INIT_VALUE(uid), |
| 677 | .gid = LTTNG_OPTIONAL_INIT_UNSET, |
| 678 | }; |
| 679 | |
| 680 | if (!trigger) { |
| 681 | ret = LTTNG_TRIGGER_STATUS_INVALID; |
| 682 | goto end; |
| 683 | } |
| 684 | |
| 685 | /* Client-side validation only to report a clearer error. */ |
| 686 | if (geteuid() != 0) { |
| 687 | ret = LTTNG_TRIGGER_STATUS_PERMISSION_DENIED; |
| 688 | goto end; |
| 689 | } |
| 690 | |
| 691 | lttng_trigger_set_credentials(trigger, &creds); |
| 692 | |
| 693 | end: |
| 694 | return ret; |
| 695 | } |
| 696 | |
| 697 | enum lttng_trigger_status lttng_trigger_get_owner_uid( |
| 698 | const struct lttng_trigger *trigger, uid_t *uid) |
| 699 | { |
| 700 | enum lttng_trigger_status ret = LTTNG_TRIGGER_STATUS_OK; |
| 701 | const struct lttng_credentials *creds = NULL; |
| 702 | |
| 703 | if (!trigger || !uid ) { |
| 704 | ret = LTTNG_TRIGGER_STATUS_INVALID; |
| 705 | goto end; |
| 706 | } |
| 707 | |
| 708 | if (!trigger->creds.uid.is_set ) { |
| 709 | ret = LTTNG_TRIGGER_STATUS_UNSET; |
| 710 | goto end; |
| 711 | } |
| 712 | |
| 713 | creds = lttng_trigger_get_credentials(trigger); |
| 714 | *uid = lttng_credentials_get_uid(creds); |
| 715 | |
| 716 | end: |
| 717 | return ret; |
| 718 | } |