| 1 | /* |
| 2 | * Copyright (C) 2019 - Jonathan Rajotte-Julien <jonathan.rajotte-julien@efficios.com> |
| 3 | * |
| 4 | * This library is free software; you can redistribute it and/or modify it |
| 5 | * under the terms of the GNU Lesser General Public License, version 2.1 only, |
| 6 | * as published by the Free Software Foundation. |
| 7 | * |
| 8 | * This library is distributed in the hope that it will be useful, but WITHOUT |
| 9 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 10 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License |
| 11 | * for more details. |
| 12 | * |
| 13 | * You should have received a copy of the GNU Lesser General Public License |
| 14 | * along with this library; if not, write to the Free Software Foundation, |
| 15 | * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| 16 | */ |
| 17 | |
| 18 | #include <lttng/event.h> |
| 19 | #include <lttng/event-rule/event-rule-internal.h> |
| 20 | #include <lttng/event-rule/tracepoint-internal.h> |
| 21 | #include <common/macros.h> |
| 22 | #include <common/error.h> |
| 23 | #include <common/runas.h> |
| 24 | #include <assert.h> |
| 25 | |
| 26 | #define IS_TRACEPOINT_EVENT_RULE(rule) ( \ |
| 27 | lttng_event_rule_get_type(rule) == LTTNG_EVENT_RULE_TYPE_TRACEPOINT \ |
| 28 | ) |
| 29 | |
| 30 | static |
| 31 | void lttng_event_rule_tracepoint_destroy(struct lttng_event_rule *rule) |
| 32 | { |
| 33 | struct lttng_event_rule_tracepoint *tracepoint; |
| 34 | |
| 35 | if (rule == NULL) { |
| 36 | return; |
| 37 | } |
| 38 | |
| 39 | tracepoint = container_of(rule, struct lttng_event_rule_tracepoint, |
| 40 | parent); |
| 41 | |
| 42 | free(tracepoint->pattern); |
| 43 | free(tracepoint->filter_expression); |
| 44 | for(int i = 0; i < tracepoint->exclusions.count; i++) { |
| 45 | free(tracepoint->exclusions.values[i]); |
| 46 | } |
| 47 | free(tracepoint->exclusions.values); |
| 48 | free(tracepoint->internal_filter.filter); |
| 49 | free(tracepoint->internal_filter.bytecode); |
| 50 | free(tracepoint); |
| 51 | } |
| 52 | |
| 53 | static |
| 54 | bool lttng_event_rule_tracepoint_validate( |
| 55 | const struct lttng_event_rule *rule) |
| 56 | { |
| 57 | bool valid = false; |
| 58 | struct lttng_event_rule_tracepoint *tracepoint; |
| 59 | |
| 60 | if (!rule) { |
| 61 | goto end; |
| 62 | } |
| 63 | |
| 64 | tracepoint = container_of(rule, struct lttng_event_rule_tracepoint, |
| 65 | parent); |
| 66 | |
| 67 | /* Required field */ |
| 68 | if (!tracepoint->pattern) { |
| 69 | ERR("Invalid tracepoint event rule: a pattern must be set."); |
| 70 | goto end; |
| 71 | } |
| 72 | if (tracepoint->domain == LTTNG_DOMAIN_NONE) { |
| 73 | ERR("Invalid tracepoint event rule: a domain must be set."); |
| 74 | goto end; |
| 75 | } |
| 76 | |
| 77 | /* QUESTION: do we validate inside state on validate or during set of |
| 78 | * each component */ |
| 79 | |
| 80 | valid = true; |
| 81 | end: |
| 82 | return valid; |
| 83 | } |
| 84 | |
| 85 | static |
| 86 | int lttng_event_rule_tracepoint_serialize( |
| 87 | const struct lttng_event_rule *rule, |
| 88 | struct lttng_dynamic_buffer *buf, |
| 89 | int *fd_to_send) |
| 90 | { |
| 91 | int ret; |
| 92 | size_t pattern_len, filter_expression_len, exclusions_len; |
| 93 | struct lttng_event_rule_tracepoint *tracepoint; |
| 94 | struct lttng_event_rule_tracepoint_comm tracepoint_comm; |
| 95 | |
| 96 | if (!rule || !IS_TRACEPOINT_EVENT_RULE(rule)) { |
| 97 | ret = -1; |
| 98 | goto end; |
| 99 | } |
| 100 | |
| 101 | DBG("Serializing tracepoint event rule"); |
| 102 | tracepoint = container_of( |
| 103 | rule, struct lttng_event_rule_tracepoint, parent); |
| 104 | |
| 105 | pattern_len = strlen(tracepoint->pattern) + 1; |
| 106 | |
| 107 | if (tracepoint->filter_expression != NULL) { |
| 108 | filter_expression_len = |
| 109 | strlen(tracepoint->filter_expression) + 1; |
| 110 | } else { |
| 111 | filter_expression_len = 0; |
| 112 | } |
| 113 | |
| 114 | exclusions_len = 0; |
| 115 | for (int i = 0; i < tracepoint->exclusions.count; i++) { |
| 116 | /* Payload */ |
| 117 | exclusions_len += strlen(tracepoint->exclusions.values[i]) + 1; |
| 118 | /* Bound check */ |
| 119 | exclusions_len += sizeof(uint32_t); |
| 120 | } |
| 121 | |
| 122 | tracepoint_comm.domain_type = (int8_t) tracepoint->domain; |
| 123 | tracepoint_comm.loglevel_type = (int8_t) tracepoint->loglevel.type; |
| 124 | tracepoint_comm.loglevel_value = tracepoint->loglevel.value; |
| 125 | tracepoint_comm.pattern_len = pattern_len; |
| 126 | tracepoint_comm.filter_expression_len = filter_expression_len; |
| 127 | tracepoint_comm.exclusions_count = tracepoint->exclusions.count; |
| 128 | tracepoint_comm.exclusions_len = exclusions_len; |
| 129 | |
| 130 | ret = lttng_dynamic_buffer_append( |
| 131 | buf, &tracepoint_comm, sizeof(tracepoint_comm)); |
| 132 | if (ret) { |
| 133 | goto end; |
| 134 | } |
| 135 | ret = lttng_dynamic_buffer_append(buf, tracepoint->pattern, |
| 136 | pattern_len); |
| 137 | if (ret) { |
| 138 | goto end; |
| 139 | } |
| 140 | ret = lttng_dynamic_buffer_append(buf, tracepoint->filter_expression, |
| 141 | filter_expression_len); |
| 142 | if (ret) { |
| 143 | goto end; |
| 144 | } |
| 145 | |
| 146 | size_t exclusions_appended = 0; |
| 147 | for (int i = 0; i < tracepoint->exclusions.count; i++) { |
| 148 | size_t len; |
| 149 | len = strlen(tracepoint->exclusions.values[i]) + 1; |
| 150 | /* Append bound check, does not include the '\0' */ |
| 151 | ret = lttng_dynamic_buffer_append(buf, &len, sizeof(uint32_t)); |
| 152 | if (ret) { |
| 153 | goto end; |
| 154 | } |
| 155 | exclusions_appended += sizeof(uint32_t); |
| 156 | |
| 157 | /* Include the '\0' in the payload */ |
| 158 | ret = lttng_dynamic_buffer_append(buf, tracepoint->exclusions.values[i], |
| 159 | len); |
| 160 | if (ret) { |
| 161 | goto end; |
| 162 | } |
| 163 | exclusions_appended += len; |
| 164 | } |
| 165 | |
| 166 | assert(exclusions_len == exclusions_appended); |
| 167 | |
| 168 | if (fd_to_send) { |
| 169 | /* No fd to send */ |
| 170 | *fd_to_send = -1; |
| 171 | } |
| 172 | |
| 173 | end: |
| 174 | return ret; |
| 175 | } |
| 176 | |
| 177 | static |
| 178 | bool lttng_event_rule_tracepoint_is_equal(const struct lttng_event_rule *_a, |
| 179 | const struct lttng_event_rule *_b) |
| 180 | { |
| 181 | bool is_equal = false; |
| 182 | struct lttng_event_rule_tracepoint *a, *b; |
| 183 | |
| 184 | a = container_of(_a, struct lttng_event_rule_tracepoint, parent); |
| 185 | b = container_of(_b, struct lttng_event_rule_tracepoint, parent); |
| 186 | |
| 187 | /* Quick checks */ |
| 188 | if (a->domain != b->domain) { |
| 189 | goto end; |
| 190 | } |
| 191 | |
| 192 | if (a->exclusions.count != b->exclusions.count) { |
| 193 | goto end; |
| 194 | } |
| 195 | |
| 196 | if (!!a->filter_expression != !!b->filter_expression) { |
| 197 | goto end; |
| 198 | } |
| 199 | |
| 200 | /* Long check */ |
| 201 | /* Tracepoint is invalid if this is not true */ |
| 202 | assert(a->pattern); |
| 203 | assert(b->pattern); |
| 204 | if (strcmp(a->pattern, b->pattern)) { |
| 205 | goto end; |
| 206 | } |
| 207 | |
| 208 | if (a->filter_expression && b->filter_expression) { |
| 209 | if (strcmp(a->filter_expression, b->filter_expression)) { |
| 210 | goto end; |
| 211 | } |
| 212 | } |
| 213 | |
| 214 | if (a->loglevel.type != b->loglevel.type) { |
| 215 | goto end; |
| 216 | } |
| 217 | |
| 218 | if (a->loglevel.value != b->loglevel.value) { |
| 219 | goto end; |
| 220 | } |
| 221 | |
| 222 | for (int i = 0; i < a->exclusions.count; i++) { |
| 223 | if (strcmp(a->exclusions.values[i], b->exclusions.values[i])) { |
| 224 | goto end; |
| 225 | } |
| 226 | } |
| 227 | |
| 228 | is_equal = true; |
| 229 | end: |
| 230 | return is_equal; |
| 231 | } |
| 232 | |
| 233 | /* |
| 234 | * On success ret is 0; |
| 235 | * |
| 236 | * On error ret is negative. |
| 237 | * |
| 238 | * An event with NO loglevel and the name is * will return NULL. |
| 239 | */ |
| 240 | static int generate_agent_filter( |
| 241 | const struct lttng_event_rule *rule, |
| 242 | char **_agent_filter) |
| 243 | { |
| 244 | int err; |
| 245 | int ret = 0; |
| 246 | char *agent_filter = NULL; |
| 247 | const char *pattern; |
| 248 | const char *filter; |
| 249 | enum lttng_loglevel_type loglevel_type; |
| 250 | enum lttng_event_rule_status status; |
| 251 | |
| 252 | assert(rule); |
| 253 | assert(_agent_filter); |
| 254 | |
| 255 | status = lttng_event_rule_tracepoint_get_pattern(rule, &pattern); |
| 256 | if (status != LTTNG_EVENT_RULE_STATUS_OK) { |
| 257 | ret = -1; |
| 258 | goto end; |
| 259 | } |
| 260 | |
| 261 | status = lttng_event_rule_tracepoint_get_filter(rule, &filter); |
| 262 | if (status == LTTNG_EVENT_RULE_STATUS_UNSET) { |
| 263 | filter = NULL; |
| 264 | } else if (status != LTTNG_EVENT_RULE_STATUS_OK) { |
| 265 | ret = -1; |
| 266 | goto end; |
| 267 | } |
| 268 | |
| 269 | status = lttng_event_rule_tracepoint_get_loglevel_type(rule, &loglevel_type); |
| 270 | if (status != LTTNG_EVENT_RULE_STATUS_OK) { |
| 271 | ret = -1; |
| 272 | goto end; |
| 273 | } |
| 274 | |
| 275 | /* Don't add filter for the '*' event. */ |
| 276 | if (strcmp(pattern, "*") != 0) { |
| 277 | if (filter) { |
| 278 | err = asprintf(&agent_filter, "(%s) && (logger_name == \"%s\")", filter, |
| 279 | pattern); |
| 280 | } else { |
| 281 | err = asprintf(&agent_filter, "logger_name == \"%s\"", pattern); |
| 282 | } |
| 283 | if (err < 0) { |
| 284 | PERROR("asprintf"); |
| 285 | ret = -1; |
| 286 | goto end; |
| 287 | } |
| 288 | } |
| 289 | |
| 290 | if (loglevel_type != LTTNG_EVENT_LOGLEVEL_ALL) { |
| 291 | const char *op; |
| 292 | int loglevel_value; |
| 293 | |
| 294 | status = lttng_event_rule_tracepoint_get_loglevel(rule, &loglevel_value); |
| 295 | if (status != LTTNG_EVENT_RULE_STATUS_OK) { |
| 296 | ret = -1; |
| 297 | goto end; |
| 298 | } |
| 299 | |
| 300 | if (loglevel_type == LTTNG_EVENT_LOGLEVEL_RANGE) { |
| 301 | op = ">="; |
| 302 | } else { |
| 303 | op = "=="; |
| 304 | } |
| 305 | |
| 306 | if (filter || agent_filter) { |
| 307 | char *new_filter; |
| 308 | |
| 309 | err = asprintf(&new_filter, "(%s) && (int_loglevel %s %d)", |
| 310 | agent_filter ? agent_filter : filter, op, |
| 311 | loglevel_value); |
| 312 | if (agent_filter) { |
| 313 | free(agent_filter); |
| 314 | } |
| 315 | agent_filter = new_filter; |
| 316 | } else { |
| 317 | err = asprintf(&agent_filter, "int_loglevel %s %d", op, |
| 318 | loglevel_value); |
| 319 | } |
| 320 | if (err < 0) { |
| 321 | PERROR("asprintf"); |
| 322 | ret = -1; |
| 323 | goto end; |
| 324 | } |
| 325 | } |
| 326 | |
| 327 | *_agent_filter = agent_filter; |
| 328 | agent_filter = NULL; |
| 329 | |
| 330 | end: |
| 331 | free(agent_filter); |
| 332 | return ret; |
| 333 | } |
| 334 | |
| 335 | static |
| 336 | enum lttng_error_code lttng_event_rule_tracepoint_populate(struct lttng_event_rule *rule, uid_t uid, gid_t gid) |
| 337 | { |
| 338 | int ret; |
| 339 | enum lttng_error_code ret_code; |
| 340 | struct lttng_event_rule_tracepoint *tracepoint; |
| 341 | enum lttng_domain_type domain_type; |
| 342 | enum lttng_event_rule_status status; |
| 343 | const char *filter; |
| 344 | struct lttng_filter_bytecode *bytecode = NULL; |
| 345 | |
| 346 | assert(rule); |
| 347 | |
| 348 | tracepoint = container_of(rule, struct lttng_event_rule_tracepoint, |
| 349 | parent); |
| 350 | |
| 351 | status = lttng_event_rule_tracepoint_get_filter(rule, &filter); |
| 352 | if (status == LTTNG_EVENT_RULE_STATUS_UNSET) { |
| 353 | filter = NULL; |
| 354 | } else if (status != LTTNG_EVENT_RULE_STATUS_OK) { |
| 355 | ret_code = LTTNG_ERR_FILTER_INVAL; |
| 356 | goto end; |
| 357 | } |
| 358 | |
| 359 | if (filter && filter[0] == '\0') { |
| 360 | ret_code = LTTNG_ERR_FILTER_INVAL; |
| 361 | goto error; |
| 362 | } |
| 363 | |
| 364 | status = lttng_event_rule_tracepoint_get_domain_type(rule, &domain_type); |
| 365 | if (status != LTTNG_EVENT_RULE_STATUS_OK) { |
| 366 | ret_code = LTTNG_ERR_UNK; |
| 367 | goto error; |
| 368 | } |
| 369 | |
| 370 | switch (domain_type) { |
| 371 | case LTTNG_DOMAIN_LOG4J: |
| 372 | case LTTNG_DOMAIN_JUL: |
| 373 | case LTTNG_DOMAIN_PYTHON: |
| 374 | { |
| 375 | char *agent_filter; |
| 376 | ret = generate_agent_filter(rule, &agent_filter); |
| 377 | if (ret) { |
| 378 | ret_code = LTTNG_ERR_FILTER_INVAL; |
| 379 | goto error; |
| 380 | } |
| 381 | tracepoint->internal_filter.filter = agent_filter; |
| 382 | break; |
| 383 | } |
| 384 | default: |
| 385 | { |
| 386 | if (filter) { |
| 387 | tracepoint->internal_filter.filter = strdup(filter); |
| 388 | if (tracepoint->internal_filter.filter == NULL) { |
| 389 | ret_code = LTTNG_ERR_NOMEM; |
| 390 | goto error; |
| 391 | } |
| 392 | } else { |
| 393 | tracepoint->internal_filter.filter = NULL; |
| 394 | } |
| 395 | break; |
| 396 | } |
| 397 | } |
| 398 | |
| 399 | if (tracepoint->internal_filter.filter == NULL) { |
| 400 | ret_code = LTTNG_OK; |
| 401 | goto end; |
| 402 | } |
| 403 | |
| 404 | ret = run_as_generate_filter_bytecode(tracepoint->internal_filter.filter, uid, gid, &bytecode); |
| 405 | if (ret) { |
| 406 | ret_code = LTTNG_ERR_FILTER_INVAL; |
| 407 | } |
| 408 | |
| 409 | tracepoint->internal_filter.bytecode = bytecode; |
| 410 | bytecode = NULL; |
| 411 | ret_code = LTTNG_OK; |
| 412 | |
| 413 | error: |
| 414 | end: |
| 415 | free(bytecode); |
| 416 | return ret_code; |
| 417 | |
| 418 | } |
| 419 | |
| 420 | static const char *lttng_event_rule_tracepoint_get_internal_filter( |
| 421 | const struct lttng_event_rule *rule) |
| 422 | { |
| 423 | struct lttng_event_rule_tracepoint *tracepoint; |
| 424 | assert(rule); |
| 425 | |
| 426 | tracepoint = container_of(rule, struct lttng_event_rule_tracepoint, |
| 427 | parent); |
| 428 | return tracepoint->internal_filter.filter; |
| 429 | } |
| 430 | |
| 431 | static const struct lttng_filter_bytecode * |
| 432 | lttng_event_rule_tracepoint_get_internal_filter_bytecode( |
| 433 | const struct lttng_event_rule *rule) |
| 434 | { |
| 435 | struct lttng_event_rule_tracepoint *tracepoint; |
| 436 | assert(rule); |
| 437 | |
| 438 | tracepoint = container_of(rule, struct lttng_event_rule_tracepoint, |
| 439 | parent); |
| 440 | return tracepoint->internal_filter.bytecode; |
| 441 | } |
| 442 | |
| 443 | /* TODO: review error handling, the function should be able to |
| 444 | * return error information. |
| 445 | */ |
| 446 | static struct lttng_event_exclusion * |
| 447 | lttng_event_rule_tracepoint_generate_exclusions(struct lttng_event_rule *rule) |
| 448 | { |
| 449 | enum lttng_domain_type domain_type = LTTNG_DOMAIN_NONE; |
| 450 | struct lttng_event_exclusion *local_exclusions = NULL; |
| 451 | struct lttng_event_exclusion *ret_exclusions = NULL; |
| 452 | unsigned int nb_exclusions = 0; |
| 453 | |
| 454 | (void) lttng_event_rule_tracepoint_get_domain_type(rule, &domain_type); |
| 455 | |
| 456 | switch (domain_type) { |
| 457 | case LTTNG_DOMAIN_KERNEL: |
| 458 | case LTTNG_DOMAIN_JUL: |
| 459 | case LTTNG_DOMAIN_LOG4J: |
| 460 | case LTTNG_DOMAIN_PYTHON: |
| 461 | /* Not supported */ |
| 462 | ret_exclusions = NULL; |
| 463 | goto end; |
| 464 | case LTTNG_DOMAIN_UST: |
| 465 | /* Exclusions supported */ |
| 466 | break; |
| 467 | default: |
| 468 | assert(0); |
| 469 | } |
| 470 | |
| 471 | (void) lttng_event_rule_tracepoint_get_exclusions_count(rule, &nb_exclusions); |
| 472 | if (nb_exclusions == 0) { |
| 473 | /* Nothing to do */ |
| 474 | ret_exclusions = NULL; |
| 475 | goto end; |
| 476 | } |
| 477 | |
| 478 | local_exclusions = zmalloc(sizeof(struct lttng_event_exclusion) + (LTTNG_SYMBOL_NAME_LEN * nb_exclusions)); |
| 479 | if (!local_exclusions) { |
| 480 | ERR("local exclusion allocation"); |
| 481 | ret_exclusions = NULL; |
| 482 | goto end; |
| 483 | } |
| 484 | |
| 485 | local_exclusions->count = nb_exclusions; |
| 486 | for (unsigned int i = 0; i < nb_exclusions; i++) { |
| 487 | /* TODO: check for truncation. |
| 488 | * Part of this should be validated on set exclusion |
| 489 | */ |
| 490 | const char *tmp; |
| 491 | (void) lttng_event_rule_tracepoint_get_exclusion_at_index(rule, i, &tmp); |
| 492 | strncpy(local_exclusions->names[i], tmp, LTTNG_SYMBOL_NAME_LEN); |
| 493 | local_exclusions->names[i][LTTNG_SYMBOL_NAME_LEN-1] = '\0'; |
| 494 | } |
| 495 | |
| 496 | /* Pass ownership */ |
| 497 | ret_exclusions = local_exclusions; |
| 498 | local_exclusions = NULL; |
| 499 | end: |
| 500 | free(local_exclusions); |
| 501 | /* Not supported */ |
| 502 | return ret_exclusions; |
| 503 | } |
| 504 | |
| 505 | static struct lttng_event *lttng_event_rule_tracepoint_generate_lttng_event( |
| 506 | const struct lttng_event_rule *rule) |
| 507 | { |
| 508 | const struct lttng_event_rule_tracepoint *tracepoint; |
| 509 | struct lttng_event *local_event = NULL; |
| 510 | struct lttng_event *event = NULL; |
| 511 | |
| 512 | tracepoint = container_of( |
| 513 | rule, const struct lttng_event_rule_tracepoint, parent); |
| 514 | |
| 515 | local_event = zmalloc(sizeof(*local_event)); |
| 516 | if (!local_event) { |
| 517 | goto error; |
| 518 | } |
| 519 | |
| 520 | local_event->type = LTTNG_EVENT_TRACEPOINT; |
| 521 | (void) strncpy(local_event->name, tracepoint->pattern, |
| 522 | sizeof(local_event->name) - 1); |
| 523 | local_event->name[sizeof(local_event->name) - 1] = '\0'; |
| 524 | local_event->loglevel_type = tracepoint->loglevel.type; |
| 525 | local_event->loglevel = tracepoint->loglevel.value; |
| 526 | |
| 527 | event = local_event; |
| 528 | local_event = NULL; |
| 529 | error: |
| 530 | free(local_event); |
| 531 | return event; |
| 532 | } |
| 533 | |
| 534 | struct lttng_event_rule *lttng_event_rule_tracepoint_create(enum lttng_domain_type domain_type) |
| 535 | { |
| 536 | struct lttng_event_rule_tracepoint *rule; |
| 537 | |
| 538 | if (domain_type == LTTNG_DOMAIN_NONE) { |
| 539 | return NULL; |
| 540 | } |
| 541 | |
| 542 | rule = zmalloc(sizeof(struct lttng_event_rule_tracepoint)); |
| 543 | if (!rule) { |
| 544 | return NULL; |
| 545 | } |
| 546 | |
| 547 | lttng_event_rule_init(&rule->parent, LTTNG_EVENT_RULE_TYPE_TRACEPOINT); |
| 548 | rule->parent.validate = lttng_event_rule_tracepoint_validate; |
| 549 | rule->parent.serialize = lttng_event_rule_tracepoint_serialize; |
| 550 | rule->parent.equal = lttng_event_rule_tracepoint_is_equal; |
| 551 | rule->parent.destroy = lttng_event_rule_tracepoint_destroy; |
| 552 | rule->parent.populate = lttng_event_rule_tracepoint_populate; |
| 553 | rule->parent.get_filter = lttng_event_rule_tracepoint_get_internal_filter; |
| 554 | rule->parent.get_filter_bytecode = lttng_event_rule_tracepoint_get_internal_filter_bytecode; |
| 555 | rule->parent.generate_exclusions = lttng_event_rule_tracepoint_generate_exclusions; |
| 556 | rule->parent.generate_lttng_event = |
| 557 | lttng_event_rule_tracepoint_generate_lttng_event; |
| 558 | |
| 559 | rule->domain = domain_type; |
| 560 | rule->loglevel.type = LTTNG_EVENT_LOGLEVEL_ALL; |
| 561 | |
| 562 | return &rule->parent; |
| 563 | } |
| 564 | |
| 565 | LTTNG_HIDDEN |
| 566 | ssize_t lttng_event_rule_tracepoint_create_from_buffer( |
| 567 | const struct lttng_buffer_view *view, |
| 568 | struct lttng_event_rule **_event_rule) |
| 569 | { |
| 570 | ssize_t ret, offset = 0; |
| 571 | enum lttng_event_rule_status status; |
| 572 | enum lttng_domain_type domain_type; |
| 573 | enum lttng_loglevel_type loglevel_type; |
| 574 | const struct lttng_event_rule_tracepoint_comm *tracepoint_comm; |
| 575 | const char *pattern; |
| 576 | const char *filter_expression = NULL; |
| 577 | const char **exclusions = NULL; |
| 578 | const uint32_t *exclusion_len; |
| 579 | const char *exclusion; |
| 580 | struct lttng_buffer_view current_view; |
| 581 | struct lttng_event_rule *rule = NULL; |
| 582 | |
| 583 | if (!_event_rule) { |
| 584 | ret = -1; |
| 585 | goto end; |
| 586 | } |
| 587 | |
| 588 | if (view->size < sizeof(*tracepoint_comm)) { |
| 589 | ERR("Failed to initialize from malformed event rule tracepoint: buffer too short to contain header"); |
| 590 | ret = -1; |
| 591 | goto end; |
| 592 | } |
| 593 | |
| 594 | current_view = lttng_buffer_view_from_view(view, offset, sizeof(*tracepoint_comm)); |
| 595 | tracepoint_comm = (typeof(tracepoint_comm)) current_view.data; |
| 596 | |
| 597 | if(!tracepoint_comm) { |
| 598 | ret = -1; |
| 599 | goto end; |
| 600 | } |
| 601 | |
| 602 | if (tracepoint_comm->domain_type <= LTTNG_DOMAIN_NONE || |
| 603 | tracepoint_comm->domain_type > LTTNG_DOMAIN_PYTHON) { |
| 604 | /* Invalid domain value. */ |
| 605 | ERR("Invalid domain type value (%i) found in tracepoint_comm buffer", |
| 606 | (int) tracepoint_comm->domain_type); |
| 607 | ret = -1; |
| 608 | goto end; |
| 609 | } |
| 610 | |
| 611 | domain_type = (enum lttng_domain_type) tracepoint_comm->domain_type; |
| 612 | rule = lttng_event_rule_tracepoint_create(domain_type); |
| 613 | if (!rule) { |
| 614 | ERR("Failed to create event rule tracepoint"); |
| 615 | ret = -1; |
| 616 | goto end; |
| 617 | } |
| 618 | |
| 619 | loglevel_type = (enum lttng_loglevel_type) |
| 620 | tracepoint_comm->loglevel_type; |
| 621 | switch (loglevel_type) { |
| 622 | case LTTNG_EVENT_LOGLEVEL_ALL: |
| 623 | status = lttng_event_rule_tracepoint_set_loglevel_all(rule); |
| 624 | break; |
| 625 | case LTTNG_EVENT_LOGLEVEL_RANGE: |
| 626 | status = lttng_event_rule_tracepoint_set_loglevel_range( |
| 627 | rule, (enum lttng_loglevel_type) tracepoint_comm |
| 628 | ->loglevel_value); |
| 629 | break; |
| 630 | case LTTNG_EVENT_LOGLEVEL_SINGLE: |
| 631 | status = lttng_event_rule_tracepoint_set_loglevel( |
| 632 | rule, (enum lttng_loglevel_type) tracepoint_comm |
| 633 | ->loglevel_value); |
| 634 | break; |
| 635 | default: |
| 636 | ERR("Failed to set event rule tracepoint loglevel: unknown loglevel type"); |
| 637 | ret = -1; |
| 638 | goto end; |
| 639 | } |
| 640 | if (status != LTTNG_EVENT_RULE_STATUS_OK) { |
| 641 | ERR("Failed to set event rule tracepoint loglevel"); |
| 642 | } |
| 643 | |
| 644 | /* Skip to payload */ |
| 645 | offset += current_view.size; |
| 646 | |
| 647 | /* Map the pattern */ |
| 648 | current_view = lttng_buffer_view_from_view(view, offset, tracepoint_comm->pattern_len); |
| 649 | pattern = current_view.data; |
| 650 | if (!pattern) { |
| 651 | ret = -1; |
| 652 | goto end; |
| 653 | } |
| 654 | |
| 655 | if (tracepoint_comm->pattern_len == 1 || |
| 656 | pattern[tracepoint_comm->pattern_len - 1] != '\0' || |
| 657 | strlen(pattern) != tracepoint_comm->pattern_len - 1) { |
| 658 | /* |
| 659 | * Check that the pattern is not NULL, is NULL-terminated, and |
| 660 | * does not contain a NULL before the last byte. |
| 661 | */ |
| 662 | ret = -1; |
| 663 | goto end; |
| 664 | } |
| 665 | |
| 666 | /* Skip after the pattern */ |
| 667 | offset += tracepoint_comm->pattern_len; |
| 668 | |
| 669 | if (!tracepoint_comm->filter_expression_len) { |
| 670 | goto skip_filter_expression; |
| 671 | } |
| 672 | |
| 673 | /* Map the filter_expression */ |
| 674 | current_view = lttng_buffer_view_from_view(view, offset, tracepoint_comm->filter_expression_len); |
| 675 | filter_expression = current_view.data; |
| 676 | if (!filter_expression) { |
| 677 | ret = -1; |
| 678 | goto end; |
| 679 | } |
| 680 | |
| 681 | if (tracepoint_comm->filter_expression_len == 1 || |
| 682 | filter_expression[tracepoint_comm->filter_expression_len - |
| 683 | 1] != '\0' || |
| 684 | strlen(filter_expression) != |
| 685 | tracepoint_comm->filter_expression_len - |
| 686 | 1) { |
| 687 | /* |
| 688 | * Check that the filter expression is not NULL, is |
| 689 | * NULL-terminated, and does not contain a NULL before the last |
| 690 | * byte. |
| 691 | */ |
| 692 | ret = -1; |
| 693 | goto end; |
| 694 | } |
| 695 | |
| 696 | /* Skip after the pattern */ |
| 697 | offset += tracepoint_comm->filter_expression_len; |
| 698 | |
| 699 | skip_filter_expression: |
| 700 | |
| 701 | if (!tracepoint_comm->exclusions_count) { |
| 702 | goto skip_exclusions; |
| 703 | } |
| 704 | |
| 705 | exclusions = zmalloc(sizeof(*exclusions) * tracepoint_comm->exclusions_count); |
| 706 | if (!exclusions) { |
| 707 | ret = -1; |
| 708 | goto end; |
| 709 | } |
| 710 | |
| 711 | for (int i = 0; i < tracepoint_comm->exclusions_count; i++) { |
| 712 | current_view = lttng_buffer_view_from_view(view, offset, sizeof(*exclusion_len)); |
| 713 | exclusion_len = (typeof(exclusion_len)) current_view.data; |
| 714 | if (!exclusion_len) { |
| 715 | ret = -1; |
| 716 | goto end; |
| 717 | } |
| 718 | |
| 719 | offset += sizeof(*exclusion_len); |
| 720 | current_view = lttng_buffer_view_from_view(view, offset, *exclusion_len); |
| 721 | exclusion = current_view.data; |
| 722 | if (*exclusion_len == 1 || |
| 723 | exclusion[*exclusion_len - 1] != '\0' || |
| 724 | strlen(exclusion) != *exclusion_len - 1) { |
| 725 | /* |
| 726 | * Check that the exclusion is not NULL, is |
| 727 | * NULL-terminated, and does not contain a NULL before |
| 728 | * the last byte. |
| 729 | */ |
| 730 | ret = -1; |
| 731 | goto end; |
| 732 | } |
| 733 | exclusions[i] = exclusion; |
| 734 | /* Skip to next exclusion */ |
| 735 | offset += *exclusion_len; |
| 736 | } |
| 737 | |
| 738 | skip_exclusions: |
| 739 | status = lttng_event_rule_tracepoint_set_pattern(rule, pattern); |
| 740 | if (status != LTTNG_EVENT_RULE_STATUS_OK) { |
| 741 | ERR("Failed to set event rule tracepoint pattern"); |
| 742 | ret = -1; |
| 743 | goto end; |
| 744 | } |
| 745 | |
| 746 | if (filter_expression) { |
| 747 | status = lttng_event_rule_tracepoint_set_filter( |
| 748 | rule, filter_expression); |
| 749 | if (status != LTTNG_EVENT_RULE_STATUS_OK) { |
| 750 | ERR("Failed to set event rule tracepoint pattern"); |
| 751 | ret = -1; |
| 752 | goto end; |
| 753 | } |
| 754 | } |
| 755 | |
| 756 | if (exclusions) { |
| 757 | status = lttng_event_rule_tracepoint_set_exclusions(rule, |
| 758 | tracepoint_comm->exclusions_count, exclusions); |
| 759 | if (status != LTTNG_EVENT_RULE_STATUS_OK) { |
| 760 | ERR("Failed to set event rule tracepoint exclusions"); |
| 761 | ret = -1; |
| 762 | goto end; |
| 763 | } |
| 764 | } |
| 765 | |
| 766 | *_event_rule = rule; |
| 767 | rule = NULL; |
| 768 | ret = offset; |
| 769 | end: |
| 770 | free(exclusions); |
| 771 | lttng_event_rule_destroy(rule); |
| 772 | return ret; |
| 773 | } |
| 774 | |
| 775 | enum lttng_event_rule_status lttng_event_rule_tracepoint_set_pattern( |
| 776 | struct lttng_event_rule *rule, const char *pattern) |
| 777 | { |
| 778 | char *pattern_copy = NULL; |
| 779 | struct lttng_event_rule_tracepoint *tracepoint; |
| 780 | enum lttng_event_rule_status status = LTTNG_EVENT_RULE_STATUS_OK; |
| 781 | |
| 782 | if (!rule || !IS_TRACEPOINT_EVENT_RULE(rule) || !pattern || |
| 783 | strlen(pattern) == 0) { |
| 784 | status = LTTNG_EVENT_RULE_STATUS_INVALID; |
| 785 | goto end; |
| 786 | } |
| 787 | |
| 788 | tracepoint = container_of(rule, struct lttng_event_rule_tracepoint, |
| 789 | parent); |
| 790 | pattern_copy = strdup(pattern); |
| 791 | if (!pattern_copy) { |
| 792 | status = LTTNG_EVENT_RULE_STATUS_ERROR; |
| 793 | goto end; |
| 794 | } |
| 795 | |
| 796 | if (tracepoint->pattern) { |
| 797 | free(tracepoint->pattern); |
| 798 | } |
| 799 | |
| 800 | tracepoint->pattern = pattern_copy; |
| 801 | pattern_copy = NULL; |
| 802 | end: |
| 803 | return status; |
| 804 | } |
| 805 | |
| 806 | enum lttng_event_rule_status lttng_event_rule_tracepoint_get_pattern( |
| 807 | const struct lttng_event_rule *rule, const char **pattern) |
| 808 | { |
| 809 | struct lttng_event_rule_tracepoint *tracepoint; |
| 810 | enum lttng_event_rule_status status = LTTNG_EVENT_RULE_STATUS_OK; |
| 811 | |
| 812 | if (!rule || !IS_TRACEPOINT_EVENT_RULE(rule) || !pattern) { |
| 813 | status = LTTNG_EVENT_RULE_STATUS_INVALID; |
| 814 | goto end; |
| 815 | } |
| 816 | |
| 817 | tracepoint = container_of(rule, struct lttng_event_rule_tracepoint, |
| 818 | parent); |
| 819 | if (!tracepoint->pattern) { |
| 820 | status = LTTNG_EVENT_RULE_STATUS_UNSET; |
| 821 | goto end; |
| 822 | } |
| 823 | |
| 824 | *pattern = tracepoint->pattern; |
| 825 | end: |
| 826 | return status; |
| 827 | } |
| 828 | |
| 829 | enum lttng_event_rule_status lttng_event_rule_tracepoint_get_domain_type( |
| 830 | const struct lttng_event_rule *rule, |
| 831 | enum lttng_domain_type *type) |
| 832 | { |
| 833 | struct lttng_event_rule_tracepoint *tracepoint; |
| 834 | enum lttng_event_rule_status status = LTTNG_EVENT_RULE_STATUS_OK; |
| 835 | |
| 836 | if (!rule || !IS_TRACEPOINT_EVENT_RULE(rule) || !type) { |
| 837 | status = LTTNG_EVENT_RULE_STATUS_INVALID; |
| 838 | goto end; |
| 839 | } |
| 840 | |
| 841 | tracepoint = container_of(rule, struct lttng_event_rule_tracepoint, |
| 842 | parent); |
| 843 | *type = tracepoint->domain; |
| 844 | end: |
| 845 | return status; |
| 846 | } |
| 847 | |
| 848 | enum lttng_event_rule_status lttng_event_rule_tracepoint_set_filter( |
| 849 | struct lttng_event_rule *rule, const char *expression) |
| 850 | { |
| 851 | char *expression_copy = NULL; |
| 852 | struct lttng_event_rule_tracepoint *tracepoint; |
| 853 | enum lttng_event_rule_status status = LTTNG_EVENT_RULE_STATUS_OK; |
| 854 | |
| 855 | /* TODO: validate that the passed expression is valid */ |
| 856 | |
| 857 | if (!rule || !IS_TRACEPOINT_EVENT_RULE(rule) || !expression || |
| 858 | strlen(expression) == 0) { |
| 859 | status = LTTNG_EVENT_RULE_STATUS_INVALID; |
| 860 | goto end; |
| 861 | } |
| 862 | |
| 863 | tracepoint = container_of( |
| 864 | rule, struct lttng_event_rule_tracepoint, parent); |
| 865 | expression_copy = strdup(expression); |
| 866 | if (!expression_copy) { |
| 867 | status = LTTNG_EVENT_RULE_STATUS_ERROR; |
| 868 | goto end; |
| 869 | } |
| 870 | |
| 871 | if (tracepoint->filter_expression) { |
| 872 | free(tracepoint->filter_expression); |
| 873 | } |
| 874 | |
| 875 | tracepoint->filter_expression = expression_copy; |
| 876 | expression_copy = NULL; |
| 877 | end: |
| 878 | return status; |
| 879 | } |
| 880 | |
| 881 | enum lttng_event_rule_status lttng_event_rule_tracepoint_get_filter( |
| 882 | const struct lttng_event_rule *rule, const char **expression) |
| 883 | { |
| 884 | struct lttng_event_rule_tracepoint *tracepoint; |
| 885 | enum lttng_event_rule_status status = LTTNG_EVENT_RULE_STATUS_OK; |
| 886 | |
| 887 | if (!rule || !IS_TRACEPOINT_EVENT_RULE(rule) || !expression) { |
| 888 | status = LTTNG_EVENT_RULE_STATUS_INVALID; |
| 889 | goto end; |
| 890 | } |
| 891 | |
| 892 | tracepoint = container_of(rule, struct lttng_event_rule_tracepoint, |
| 893 | parent); |
| 894 | if (!tracepoint->filter_expression) { |
| 895 | status = LTTNG_EVENT_RULE_STATUS_UNSET; |
| 896 | goto end; |
| 897 | } |
| 898 | |
| 899 | *expression = tracepoint->filter_expression; |
| 900 | end: |
| 901 | return status; |
| 902 | } |
| 903 | |
| 904 | enum lttng_event_rule_status lttng_event_rule_tracepoint_set_loglevel( |
| 905 | struct lttng_event_rule *rule, int level) |
| 906 | { |
| 907 | struct lttng_event_rule_tracepoint *tracepoint; |
| 908 | enum lttng_event_rule_status status = LTTNG_EVENT_RULE_STATUS_OK; |
| 909 | |
| 910 | /* |
| 911 | * TODO/QUESTION: do we validate the passed level based on the domain? |
| 912 | * What if no domain is set yet? Should we move the domain to the |
| 913 | * "create" api call to enforce the domain type? |
| 914 | */ |
| 915 | if (!rule || !IS_TRACEPOINT_EVENT_RULE(rule)) { |
| 916 | status = LTTNG_EVENT_RULE_STATUS_INVALID; |
| 917 | goto end; |
| 918 | } |
| 919 | |
| 920 | tracepoint = container_of(rule, struct lttng_event_rule_tracepoint, |
| 921 | parent); |
| 922 | tracepoint->loglevel.value = level; |
| 923 | tracepoint->loglevel.type = LTTNG_EVENT_LOGLEVEL_SINGLE; |
| 924 | end: |
| 925 | return status; |
| 926 | } |
| 927 | |
| 928 | enum lttng_event_rule_status lttng_event_rule_tracepoint_set_loglevel_range( |
| 929 | struct lttng_event_rule *rule, int level) |
| 930 | { |
| 931 | struct lttng_event_rule_tracepoint *tracepoint; |
| 932 | enum lttng_event_rule_status status = LTTNG_EVENT_RULE_STATUS_OK; |
| 933 | |
| 934 | /* |
| 935 | * TODO/QUESTION: do we validate the passed level based on the domain? |
| 936 | * What if no domain is set yet? Should we move the domain to the |
| 937 | * "create" api call to enforce the domain type? |
| 938 | */ |
| 939 | if (!rule || !IS_TRACEPOINT_EVENT_RULE(rule)) { |
| 940 | status = LTTNG_EVENT_RULE_STATUS_INVALID; |
| 941 | goto end; |
| 942 | } |
| 943 | |
| 944 | tracepoint = container_of(rule, struct lttng_event_rule_tracepoint, |
| 945 | parent); |
| 946 | tracepoint->loglevel.value = level; |
| 947 | tracepoint->loglevel.type = LTTNG_EVENT_LOGLEVEL_RANGE; |
| 948 | end: |
| 949 | return status; |
| 950 | } |
| 951 | |
| 952 | enum lttng_event_rule_status lttng_event_rule_tracepoint_set_loglevel_all( |
| 953 | struct lttng_event_rule *rule) |
| 954 | { |
| 955 | struct lttng_event_rule_tracepoint *tracepoint; |
| 956 | enum lttng_event_rule_status status = LTTNG_EVENT_RULE_STATUS_OK; |
| 957 | |
| 958 | if (!rule || !IS_TRACEPOINT_EVENT_RULE(rule)) { |
| 959 | status = LTTNG_EVENT_RULE_STATUS_INVALID; |
| 960 | goto end; |
| 961 | } |
| 962 | |
| 963 | tracepoint = container_of(rule, struct lttng_event_rule_tracepoint, |
| 964 | parent); |
| 965 | tracepoint->loglevel.type = LTTNG_EVENT_LOGLEVEL_ALL; |
| 966 | end: |
| 967 | return status; |
| 968 | } |
| 969 | |
| 970 | enum lttng_event_rule_status lttng_event_rule_tracepoint_get_loglevel_type( |
| 971 | const struct lttng_event_rule *rule, enum lttng_loglevel_type *type) |
| 972 | { |
| 973 | struct lttng_event_rule_tracepoint *tracepoint; |
| 974 | enum lttng_event_rule_status status = LTTNG_EVENT_RULE_STATUS_OK; |
| 975 | |
| 976 | if (!rule || !IS_TRACEPOINT_EVENT_RULE(rule) || !type) { |
| 977 | status = LTTNG_EVENT_RULE_STATUS_INVALID; |
| 978 | goto end; |
| 979 | } |
| 980 | |
| 981 | tracepoint = container_of(rule, struct lttng_event_rule_tracepoint, |
| 982 | parent); |
| 983 | *type = tracepoint->loglevel.type; |
| 984 | end: |
| 985 | return status; |
| 986 | } |
| 987 | |
| 988 | enum lttng_event_rule_status lttng_event_rule_tracepoint_get_loglevel( |
| 989 | const struct lttng_event_rule *rule, int *level) |
| 990 | { |
| 991 | struct lttng_event_rule_tracepoint *tracepoint; |
| 992 | enum lttng_event_rule_status status = LTTNG_EVENT_RULE_STATUS_OK; |
| 993 | |
| 994 | if (!rule || !IS_TRACEPOINT_EVENT_RULE(rule) || !level) { |
| 995 | status = LTTNG_EVENT_RULE_STATUS_INVALID; |
| 996 | goto end; |
| 997 | } |
| 998 | |
| 999 | tracepoint = container_of(rule, struct lttng_event_rule_tracepoint, |
| 1000 | parent); |
| 1001 | if (tracepoint->loglevel.type == LTTNG_EVENT_LOGLEVEL_ALL) { |
| 1002 | status = LTTNG_EVENT_RULE_STATUS_UNSET; |
| 1003 | goto end; |
| 1004 | } |
| 1005 | *level = tracepoint->loglevel.value; |
| 1006 | end: |
| 1007 | return status; |
| 1008 | } |
| 1009 | |
| 1010 | enum lttng_event_rule_status lttng_event_rule_tracepoint_set_exclusions( |
| 1011 | struct lttng_event_rule *rule, |
| 1012 | unsigned int count, |
| 1013 | const char **exclusions) |
| 1014 | { |
| 1015 | char **exclusions_copy = NULL; |
| 1016 | struct lttng_event_rule_tracepoint *tracepoint; |
| 1017 | enum lttng_event_rule_status status = LTTNG_EVENT_RULE_STATUS_OK; |
| 1018 | enum lttng_domain_type domain_type; |
| 1019 | |
| 1020 | /* TODO: validate that the passed exclusions are valid? */ |
| 1021 | |
| 1022 | if (!rule || !IS_TRACEPOINT_EVENT_RULE(rule) || count == 0 || |
| 1023 | !exclusions) { |
| 1024 | status = LTTNG_EVENT_RULE_STATUS_INVALID; |
| 1025 | goto end; |
| 1026 | } |
| 1027 | |
| 1028 | tracepoint = container_of( |
| 1029 | rule, struct lttng_event_rule_tracepoint, parent); |
| 1030 | |
| 1031 | status = lttng_event_rule_tracepoint_get_domain_type(rule, &domain_type); |
| 1032 | if (status != LTTNG_EVENT_RULE_STATUS_OK) { |
| 1033 | goto end; |
| 1034 | } |
| 1035 | |
| 1036 | switch (domain_type) { |
| 1037 | case LTTNG_DOMAIN_KERNEL: |
| 1038 | case LTTNG_DOMAIN_JUL: |
| 1039 | case LTTNG_DOMAIN_LOG4J: |
| 1040 | case LTTNG_DOMAIN_PYTHON: |
| 1041 | status = LTTNG_EVENT_RULE_STATUS_UNSUPPORTED; |
| 1042 | goto end; |
| 1043 | case LTTNG_DOMAIN_UST: |
| 1044 | /* Exclusions supported */ |
| 1045 | break; |
| 1046 | default: |
| 1047 | assert(0); |
| 1048 | } |
| 1049 | |
| 1050 | exclusions_copy = zmalloc(sizeof(char *) * count); |
| 1051 | if (!exclusions_copy) { |
| 1052 | status = LTTNG_EVENT_RULE_STATUS_ERROR; |
| 1053 | goto end; |
| 1054 | } |
| 1055 | |
| 1056 | /* Perform the copy locally */ |
| 1057 | for (int i = 0; i < count; i++) { |
| 1058 | exclusions_copy[i] = strdup(exclusions[i]); |
| 1059 | if (!exclusions_copy[i]) { |
| 1060 | status = LTTNG_EVENT_RULE_STATUS_ERROR; |
| 1061 | goto end; |
| 1062 | } |
| 1063 | } |
| 1064 | |
| 1065 | if (tracepoint->exclusions.count != 0) { |
| 1066 | for (int i = 0; i < tracepoint->exclusions.count; i++) { |
| 1067 | free(tracepoint->exclusions.values[i]); |
| 1068 | } |
| 1069 | free(tracepoint->exclusions.values); |
| 1070 | } |
| 1071 | |
| 1072 | tracepoint->exclusions.values = exclusions_copy; |
| 1073 | tracepoint->exclusions.count = count; |
| 1074 | exclusions_copy = NULL; |
| 1075 | end: |
| 1076 | if (exclusions_copy) { |
| 1077 | for (int i = 0; i < count; i++) { |
| 1078 | free(exclusions_copy[i]); |
| 1079 | } |
| 1080 | free(exclusions_copy); |
| 1081 | } |
| 1082 | return status; |
| 1083 | } |
| 1084 | |
| 1085 | enum lttng_event_rule_status lttng_event_rule_tracepoint_get_exclusions_count( |
| 1086 | const struct lttng_event_rule *rule, unsigned int *count) |
| 1087 | { |
| 1088 | struct lttng_event_rule_tracepoint *tracepoint; |
| 1089 | enum lttng_event_rule_status status = LTTNG_EVENT_RULE_STATUS_OK; |
| 1090 | |
| 1091 | if (!rule || !IS_TRACEPOINT_EVENT_RULE(rule) || !count) { |
| 1092 | status = LTTNG_EVENT_RULE_STATUS_INVALID; |
| 1093 | goto end; |
| 1094 | } |
| 1095 | |
| 1096 | tracepoint = container_of(rule, struct lttng_event_rule_tracepoint, |
| 1097 | parent); |
| 1098 | *count = tracepoint->exclusions.count; |
| 1099 | end: |
| 1100 | return status; |
| 1101 | } |
| 1102 | |
| 1103 | enum lttng_event_rule_status lttng_event_rule_tracepoint_get_exclusion_at_index( |
| 1104 | const struct lttng_event_rule *rule, |
| 1105 | unsigned int index, |
| 1106 | const char **exclusion) |
| 1107 | { |
| 1108 | struct lttng_event_rule_tracepoint *tracepoint; |
| 1109 | enum lttng_event_rule_status status = LTTNG_EVENT_RULE_STATUS_OK; |
| 1110 | |
| 1111 | if (!rule || !IS_TRACEPOINT_EVENT_RULE(rule) || !exclusion) { |
| 1112 | status = LTTNG_EVENT_RULE_STATUS_INVALID; |
| 1113 | goto end; |
| 1114 | } |
| 1115 | |
| 1116 | tracepoint = container_of(rule, struct lttng_event_rule_tracepoint, |
| 1117 | parent); |
| 1118 | if (index >= tracepoint->exclusions.count) { |
| 1119 | status = LTTNG_EVENT_RULE_STATUS_INVALID; |
| 1120 | goto end; |
| 1121 | } |
| 1122 | *exclusion = tracepoint->exclusions.values[index]; |
| 1123 | end: |
| 1124 | return status; |
| 1125 | } |