| 1 | /* |
| 2 | * Copyright (C) 2019 Jonathan Rajotte <jonathan.rajotte-julien@efficios.com> |
| 3 | * |
| 4 | * SPDX-License-Identifier: LGPL-2.1-only |
| 5 | * |
| 6 | */ |
| 7 | |
| 8 | #include <assert.h> |
| 9 | #include <common/credentials.h> |
| 10 | #include <common/error.h> |
| 11 | #include <common/macros.h> |
| 12 | #include <common/optional.h> |
| 13 | #include <common/payload.h> |
| 14 | #include <common/payload-view.h> |
| 15 | #include <common/runas.h> |
| 16 | #include <common/hashtable/hashtable.h> |
| 17 | #include <common/hashtable/utils.h> |
| 18 | #include <common/string-utils/string-utils.h> |
| 19 | #include <lttng/event-rule/event-rule-internal.h> |
| 20 | #include <lttng/event-rule/user-tracepoint-internal.h> |
| 21 | #include <lttng/log-level-rule.h> |
| 22 | #include <lttng/event.h> |
| 23 | |
| 24 | #define IS_USER_TRACEPOINT_EVENT_RULE(rule) \ |
| 25 | (lttng_event_rule_get_type(rule) == LTTNG_EVENT_RULE_TYPE_USER_TRACEPOINT) |
| 26 | |
| 27 | static void lttng_event_rule_user_tracepoint_destroy(struct lttng_event_rule *rule) |
| 28 | { |
| 29 | struct lttng_event_rule_user_tracepoint *tracepoint; |
| 30 | |
| 31 | if (rule == NULL) { |
| 32 | return; |
| 33 | } |
| 34 | |
| 35 | tracepoint = container_of( |
| 36 | rule, struct lttng_event_rule_user_tracepoint, parent); |
| 37 | |
| 38 | lttng_log_level_rule_destroy(tracepoint->log_level_rule); |
| 39 | lttng_dynamic_pointer_array_reset(&tracepoint->exclusions); |
| 40 | free(tracepoint->pattern); |
| 41 | free(tracepoint->filter_expression); |
| 42 | free(tracepoint->internal_filter.filter); |
| 43 | free(tracepoint->internal_filter.bytecode); |
| 44 | free(tracepoint); |
| 45 | } |
| 46 | |
| 47 | static bool lttng_event_rule_user_tracepoint_validate( |
| 48 | const struct lttng_event_rule *rule) |
| 49 | { |
| 50 | bool valid = false; |
| 51 | struct lttng_event_rule_user_tracepoint *tracepoint; |
| 52 | |
| 53 | if (!rule) { |
| 54 | goto end; |
| 55 | } |
| 56 | |
| 57 | tracepoint = container_of( |
| 58 | rule, struct lttng_event_rule_user_tracepoint, parent); |
| 59 | |
| 60 | /* Required field. */ |
| 61 | if (!tracepoint->pattern) { |
| 62 | ERR("Invalid user tracepoint event rule: a pattern must be set."); |
| 63 | goto end; |
| 64 | } |
| 65 | |
| 66 | valid = true; |
| 67 | end: |
| 68 | return valid; |
| 69 | } |
| 70 | |
| 71 | static int lttng_event_rule_user_tracepoint_serialize( |
| 72 | const struct lttng_event_rule *rule, |
| 73 | struct lttng_payload *payload) |
| 74 | { |
| 75 | int ret, i; |
| 76 | size_t pattern_len, filter_expression_len, exclusions_len, header_offset; |
| 77 | size_t size_before_log_level_rule; |
| 78 | struct lttng_event_rule_user_tracepoint *tracepoint; |
| 79 | struct lttng_event_rule_user_tracepoint_comm tracepoint_comm; |
| 80 | enum lttng_event_rule_status status; |
| 81 | unsigned int exclusion_count; |
| 82 | size_t exclusions_appended_len = 0; |
| 83 | struct lttng_event_rule_user_tracepoint_comm *header; |
| 84 | |
| 85 | if (!rule || !IS_USER_TRACEPOINT_EVENT_RULE(rule)) { |
| 86 | ret = -1; |
| 87 | goto end; |
| 88 | } |
| 89 | |
| 90 | header_offset = payload->buffer.size; |
| 91 | |
| 92 | DBG("Serializing user tracepoint event rule."); |
| 93 | tracepoint = container_of( |
| 94 | rule, struct lttng_event_rule_user_tracepoint, parent); |
| 95 | |
| 96 | status = lttng_event_rule_user_tracepoint_get_name_pattern_exclusion_count(rule, &exclusion_count); |
| 97 | assert(status == LTTNG_EVENT_RULE_STATUS_OK); |
| 98 | |
| 99 | pattern_len = strlen(tracepoint->pattern) + 1; |
| 100 | |
| 101 | if (tracepoint->filter_expression != NULL) { |
| 102 | filter_expression_len = |
| 103 | strlen(tracepoint->filter_expression) + 1; |
| 104 | } else { |
| 105 | filter_expression_len = 0; |
| 106 | } |
| 107 | |
| 108 | exclusions_len = 0; |
| 109 | for (i = 0; i < exclusion_count; i++) { |
| 110 | const char *exclusion; |
| 111 | |
| 112 | status = lttng_event_rule_user_tracepoint_get_name_pattern_exclusion_at_index( |
| 113 | rule, i, &exclusion); |
| 114 | assert(status == LTTNG_EVENT_RULE_STATUS_OK); |
| 115 | |
| 116 | /* Length field. */ |
| 117 | exclusions_len += sizeof(uint32_t); |
| 118 | /* Payload (null terminated). */ |
| 119 | exclusions_len += strlen(exclusion) + 1; |
| 120 | } |
| 121 | |
| 122 | tracepoint_comm.pattern_len = pattern_len; |
| 123 | tracepoint_comm.filter_expression_len = filter_expression_len; |
| 124 | tracepoint_comm.exclusions_count = exclusion_count; |
| 125 | tracepoint_comm.exclusions_len = exclusions_len; |
| 126 | |
| 127 | ret = lttng_dynamic_buffer_append(&payload->buffer, &tracepoint_comm, |
| 128 | sizeof(tracepoint_comm)); |
| 129 | if (ret) { |
| 130 | goto end; |
| 131 | } |
| 132 | |
| 133 | ret = lttng_dynamic_buffer_append( |
| 134 | &payload->buffer, tracepoint->pattern, pattern_len); |
| 135 | if (ret) { |
| 136 | goto end; |
| 137 | } |
| 138 | |
| 139 | ret = lttng_dynamic_buffer_append(&payload->buffer, tracepoint->filter_expression, |
| 140 | filter_expression_len); |
| 141 | if (ret) { |
| 142 | goto end; |
| 143 | } |
| 144 | |
| 145 | size_before_log_level_rule = payload->buffer.size; |
| 146 | |
| 147 | ret = lttng_log_level_rule_serialize(tracepoint->log_level_rule, payload); |
| 148 | if (ret < 0) { |
| 149 | goto end; |
| 150 | } |
| 151 | |
| 152 | header = (typeof(header)) ((char *) payload->buffer.data + header_offset); |
| 153 | header->log_level_rule_len = |
| 154 | payload->buffer.size - size_before_log_level_rule; |
| 155 | |
| 156 | for (i = 0; i < exclusion_count; i++) { |
| 157 | size_t len; |
| 158 | const char *exclusion; |
| 159 | |
| 160 | status = lttng_event_rule_user_tracepoint_get_name_pattern_exclusion_at_index( |
| 161 | rule, i, &exclusion); |
| 162 | assert(status == LTTNG_EVENT_RULE_STATUS_OK); |
| 163 | |
| 164 | len = strlen(exclusion) + 1; |
| 165 | /* Append exclusion length, includes the null terminator. */ |
| 166 | ret = lttng_dynamic_buffer_append( |
| 167 | &payload->buffer, &len, sizeof(uint32_t)); |
| 168 | if (ret) { |
| 169 | goto end; |
| 170 | } |
| 171 | |
| 172 | exclusions_appended_len += sizeof(uint32_t); |
| 173 | |
| 174 | /* Include the '\0' in the payload. */ |
| 175 | ret = lttng_dynamic_buffer_append( |
| 176 | &payload->buffer, exclusion, len); |
| 177 | if (ret) { |
| 178 | goto end; |
| 179 | } |
| 180 | |
| 181 | exclusions_appended_len += len; |
| 182 | } |
| 183 | |
| 184 | assert(exclusions_len == exclusions_appended_len); |
| 185 | |
| 186 | end: |
| 187 | return ret; |
| 188 | } |
| 189 | |
| 190 | static bool lttng_event_rule_user_tracepoint_is_equal( |
| 191 | const struct lttng_event_rule *_a, |
| 192 | const struct lttng_event_rule *_b) |
| 193 | { |
| 194 | int i; |
| 195 | bool is_equal = false; |
| 196 | struct lttng_event_rule_user_tracepoint *a, *b; |
| 197 | unsigned int count_a, count_b; |
| 198 | enum lttng_event_rule_status status; |
| 199 | |
| 200 | a = container_of(_a, struct lttng_event_rule_user_tracepoint, parent); |
| 201 | b = container_of(_b, struct lttng_event_rule_user_tracepoint, parent); |
| 202 | |
| 203 | status = lttng_event_rule_user_tracepoint_get_name_pattern_exclusion_count(_a, &count_a); |
| 204 | assert(status == LTTNG_EVENT_RULE_STATUS_OK); |
| 205 | status = lttng_event_rule_user_tracepoint_get_name_pattern_exclusion_count(_b, &count_b); |
| 206 | assert(status == LTTNG_EVENT_RULE_STATUS_OK); |
| 207 | |
| 208 | /* Quick checks. */ |
| 209 | if (count_a != count_b) { |
| 210 | goto end; |
| 211 | } |
| 212 | |
| 213 | if (!!a->filter_expression != !!b->filter_expression) { |
| 214 | goto end; |
| 215 | } |
| 216 | |
| 217 | /* Long check. */ |
| 218 | assert(a->pattern); |
| 219 | assert(b->pattern); |
| 220 | if (strcmp(a->pattern, b->pattern)) { |
| 221 | goto end; |
| 222 | } |
| 223 | |
| 224 | if (a->filter_expression && b->filter_expression) { |
| 225 | if (strcmp(a->filter_expression, b->filter_expression)) { |
| 226 | goto end; |
| 227 | } |
| 228 | } else if (!!a->filter_expression != !!b->filter_expression) { |
| 229 | /* One is set; not the other. */ |
| 230 | goto end; |
| 231 | } |
| 232 | |
| 233 | if (!lttng_log_level_rule_is_equal( |
| 234 | a->log_level_rule, b->log_level_rule)) { |
| 235 | goto end; |
| 236 | } |
| 237 | |
| 238 | for (i = 0; i < count_a; i++) { |
| 239 | const char *exclusion_a, *exclusion_b; |
| 240 | |
| 241 | status = lttng_event_rule_user_tracepoint_get_name_pattern_exclusion_at_index( |
| 242 | _a, i, &exclusion_a); |
| 243 | assert(status == LTTNG_EVENT_RULE_STATUS_OK); |
| 244 | status = lttng_event_rule_user_tracepoint_get_name_pattern_exclusion_at_index( |
| 245 | _b, i, &exclusion_b); |
| 246 | assert(status == LTTNG_EVENT_RULE_STATUS_OK); |
| 247 | if (strcmp(exclusion_a, exclusion_b)) { |
| 248 | goto end; |
| 249 | } |
| 250 | } |
| 251 | |
| 252 | is_equal = true; |
| 253 | end: |
| 254 | return is_equal; |
| 255 | } |
| 256 | |
| 257 | static enum lttng_error_code |
| 258 | lttng_event_rule_user_tracepoint_generate_filter_bytecode( |
| 259 | struct lttng_event_rule *rule, |
| 260 | const struct lttng_credentials *creds) |
| 261 | { |
| 262 | int ret; |
| 263 | enum lttng_error_code ret_code; |
| 264 | struct lttng_event_rule_user_tracepoint *tracepoint; |
| 265 | enum lttng_event_rule_status status; |
| 266 | const char *filter; |
| 267 | struct lttng_bytecode *bytecode = NULL; |
| 268 | |
| 269 | assert(rule); |
| 270 | |
| 271 | tracepoint = container_of( |
| 272 | rule, struct lttng_event_rule_user_tracepoint, parent); |
| 273 | |
| 274 | status = lttng_event_rule_user_tracepoint_get_filter(rule, &filter); |
| 275 | if (status == LTTNG_EVENT_RULE_STATUS_UNSET) { |
| 276 | filter = NULL; |
| 277 | } else if (status != LTTNG_EVENT_RULE_STATUS_OK) { |
| 278 | ret_code = LTTNG_ERR_FILTER_INVAL; |
| 279 | goto end; |
| 280 | } |
| 281 | |
| 282 | if (filter && filter[0] == '\0') { |
| 283 | ret_code = LTTNG_ERR_FILTER_INVAL; |
| 284 | goto error; |
| 285 | } |
| 286 | |
| 287 | if (filter) { |
| 288 | tracepoint->internal_filter.filter = strdup(filter); |
| 289 | if (tracepoint->internal_filter.filter == NULL) { |
| 290 | ret_code = LTTNG_ERR_NOMEM; |
| 291 | goto error; |
| 292 | } |
| 293 | } else { |
| 294 | tracepoint->internal_filter.filter = NULL; |
| 295 | } |
| 296 | |
| 297 | if (tracepoint->internal_filter.filter == NULL) { |
| 298 | ret_code = LTTNG_OK; |
| 299 | goto end; |
| 300 | } |
| 301 | |
| 302 | ret = run_as_generate_filter_bytecode( |
| 303 | tracepoint->internal_filter.filter, creds, |
| 304 | &bytecode); |
| 305 | if (ret) { |
| 306 | ret_code = LTTNG_ERR_FILTER_INVAL; |
| 307 | goto end; |
| 308 | } |
| 309 | |
| 310 | tracepoint->internal_filter.bytecode = bytecode; |
| 311 | bytecode = NULL; |
| 312 | ret_code = LTTNG_OK; |
| 313 | |
| 314 | error: |
| 315 | end: |
| 316 | free(bytecode); |
| 317 | return ret_code; |
| 318 | } |
| 319 | |
| 320 | static const char *lttng_event_rule_user_tracepoint_get_internal_filter( |
| 321 | const struct lttng_event_rule *rule) |
| 322 | { |
| 323 | struct lttng_event_rule_user_tracepoint *tracepoint; |
| 324 | |
| 325 | assert(rule); |
| 326 | tracepoint = container_of( |
| 327 | rule, struct lttng_event_rule_user_tracepoint, parent); |
| 328 | return tracepoint->internal_filter.filter; |
| 329 | } |
| 330 | |
| 331 | static const struct lttng_bytecode * |
| 332 | lttng_event_rule_user_tracepoint_get_internal_filter_bytecode( |
| 333 | const struct lttng_event_rule *rule) |
| 334 | { |
| 335 | struct lttng_event_rule_user_tracepoint *tracepoint; |
| 336 | |
| 337 | assert(rule); |
| 338 | tracepoint = container_of( |
| 339 | rule, struct lttng_event_rule_user_tracepoint, parent); |
| 340 | return tracepoint->internal_filter.bytecode; |
| 341 | } |
| 342 | |
| 343 | static enum lttng_event_rule_generate_exclusions_status |
| 344 | lttng_event_rule_user_tracepoint_generate_exclusions( |
| 345 | const struct lttng_event_rule *rule, |
| 346 | struct lttng_event_exclusion **_exclusions) |
| 347 | { |
| 348 | unsigned int nb_exclusions = 0, i; |
| 349 | struct lttng_event_exclusion *exclusions; |
| 350 | enum lttng_event_rule_status event_rule_status; |
| 351 | enum lttng_event_rule_generate_exclusions_status ret_status; |
| 352 | |
| 353 | assert(_exclusions); |
| 354 | |
| 355 | event_rule_status = lttng_event_rule_user_tracepoint_get_name_pattern_exclusion_count( |
| 356 | rule, &nb_exclusions); |
| 357 | assert(event_rule_status == LTTNG_EVENT_RULE_STATUS_OK); |
| 358 | if (nb_exclusions == 0) { |
| 359 | /* Nothing to do. */ |
| 360 | exclusions = NULL; |
| 361 | ret_status = LTTNG_EVENT_RULE_GENERATE_EXCLUSIONS_STATUS_NONE; |
| 362 | goto end; |
| 363 | } |
| 364 | |
| 365 | exclusions = zmalloc(sizeof(struct lttng_event_exclusion) + |
| 366 | (LTTNG_SYMBOL_NAME_LEN * nb_exclusions)); |
| 367 | if (!exclusions) { |
| 368 | PERROR("Failed to allocate exclusions buffer"); |
| 369 | ret_status = LTTNG_EVENT_RULE_GENERATE_EXCLUSIONS_STATUS_OUT_OF_MEMORY; |
| 370 | goto end; |
| 371 | } |
| 372 | |
| 373 | exclusions->count = nb_exclusions; |
| 374 | for (i = 0; i < nb_exclusions; i++) { |
| 375 | int copy_ret; |
| 376 | const char *exclusion_str; |
| 377 | |
| 378 | event_rule_status = |
| 379 | lttng_event_rule_user_tracepoint_get_name_pattern_exclusion_at_index( |
| 380 | rule, i, &exclusion_str); |
| 381 | assert(event_rule_status == LTTNG_EVENT_RULE_STATUS_OK); |
| 382 | |
| 383 | copy_ret = lttng_strncpy(exclusions->names[i], exclusion_str, |
| 384 | LTTNG_SYMBOL_NAME_LEN); |
| 385 | if (copy_ret) { |
| 386 | free(exclusions); |
| 387 | exclusions = NULL; |
| 388 | ret_status = LTTNG_EVENT_RULE_GENERATE_EXCLUSIONS_STATUS_ERROR; |
| 389 | goto end; |
| 390 | } |
| 391 | } |
| 392 | |
| 393 | ret_status = LTTNG_EVENT_RULE_GENERATE_EXCLUSIONS_STATUS_OK; |
| 394 | |
| 395 | end: |
| 396 | *_exclusions = exclusions; |
| 397 | return ret_status; |
| 398 | } |
| 399 | |
| 400 | static void destroy_lttng_exclusions_element(void *ptr) |
| 401 | { |
| 402 | free(ptr); |
| 403 | } |
| 404 | |
| 405 | static unsigned long lttng_event_rule_user_tracepoint_hash( |
| 406 | const struct lttng_event_rule *rule) |
| 407 | { |
| 408 | unsigned long hash; |
| 409 | unsigned int i, exclusion_count; |
| 410 | enum lttng_event_rule_status status; |
| 411 | struct lttng_event_rule_user_tracepoint *tp_rule = |
| 412 | container_of(rule, typeof(*tp_rule), parent); |
| 413 | |
| 414 | hash = hash_key_ulong((void *) LTTNG_EVENT_RULE_TYPE_USER_TRACEPOINT, |
| 415 | lttng_ht_seed); |
| 416 | hash ^= hash_key_str(tp_rule->pattern, lttng_ht_seed); |
| 417 | |
| 418 | if (tp_rule->filter_expression) { |
| 419 | hash ^= hash_key_str(tp_rule->filter_expression, lttng_ht_seed); |
| 420 | } |
| 421 | |
| 422 | if (tp_rule->log_level_rule) { |
| 423 | hash ^= lttng_log_level_rule_hash(tp_rule->log_level_rule); |
| 424 | } |
| 425 | |
| 426 | status = lttng_event_rule_user_tracepoint_get_name_pattern_exclusion_count(rule, |
| 427 | &exclusion_count); |
| 428 | assert(status == LTTNG_EVENT_RULE_STATUS_OK); |
| 429 | |
| 430 | for (i = 0; i < exclusion_count; i++) { |
| 431 | const char *exclusion; |
| 432 | |
| 433 | status = lttng_event_rule_user_tracepoint_get_name_pattern_exclusion_at_index( |
| 434 | rule, i, &exclusion); |
| 435 | assert(status == LTTNG_EVENT_RULE_STATUS_OK); |
| 436 | hash ^= hash_key_str(exclusion, lttng_ht_seed); |
| 437 | } |
| 438 | |
| 439 | return hash; |
| 440 | } |
| 441 | |
| 442 | struct lttng_event_rule *lttng_event_rule_user_tracepoint_create(void) |
| 443 | { |
| 444 | struct lttng_event_rule *rule = NULL; |
| 445 | struct lttng_event_rule_user_tracepoint *tp_rule; |
| 446 | enum lttng_event_rule_status status; |
| 447 | |
| 448 | tp_rule = zmalloc(sizeof(struct lttng_event_rule_user_tracepoint)); |
| 449 | if (!tp_rule) { |
| 450 | goto end; |
| 451 | } |
| 452 | |
| 453 | rule = &tp_rule->parent; |
| 454 | lttng_event_rule_init(&tp_rule->parent, LTTNG_EVENT_RULE_TYPE_USER_TRACEPOINT); |
| 455 | tp_rule->parent.validate = lttng_event_rule_user_tracepoint_validate; |
| 456 | tp_rule->parent.serialize = lttng_event_rule_user_tracepoint_serialize; |
| 457 | tp_rule->parent.equal = lttng_event_rule_user_tracepoint_is_equal; |
| 458 | tp_rule->parent.destroy = lttng_event_rule_user_tracepoint_destroy; |
| 459 | tp_rule->parent.generate_filter_bytecode = |
| 460 | lttng_event_rule_user_tracepoint_generate_filter_bytecode; |
| 461 | tp_rule->parent.get_filter = |
| 462 | lttng_event_rule_user_tracepoint_get_internal_filter; |
| 463 | tp_rule->parent.get_filter_bytecode = |
| 464 | lttng_event_rule_user_tracepoint_get_internal_filter_bytecode; |
| 465 | tp_rule->parent.generate_exclusions = |
| 466 | lttng_event_rule_user_tracepoint_generate_exclusions; |
| 467 | tp_rule->parent.hash = lttng_event_rule_user_tracepoint_hash; |
| 468 | |
| 469 | /* Not necessary for now. */ |
| 470 | tp_rule->parent.generate_lttng_event = NULL; |
| 471 | |
| 472 | tp_rule->log_level_rule = NULL; |
| 473 | |
| 474 | lttng_dynamic_pointer_array_init(&tp_rule->exclusions, |
| 475 | destroy_lttng_exclusions_element); |
| 476 | |
| 477 | /* Default pattern is '*'. */ |
| 478 | status = lttng_event_rule_user_tracepoint_set_name_pattern(rule, "*"); |
| 479 | if (status != LTTNG_EVENT_RULE_STATUS_OK) { |
| 480 | lttng_event_rule_destroy(rule); |
| 481 | rule = NULL; |
| 482 | } |
| 483 | |
| 484 | end: |
| 485 | return rule; |
| 486 | } |
| 487 | |
| 488 | LTTNG_HIDDEN |
| 489 | ssize_t lttng_event_rule_user_tracepoint_create_from_payload( |
| 490 | struct lttng_payload_view *view, |
| 491 | struct lttng_event_rule **_event_rule) |
| 492 | { |
| 493 | ssize_t ret, offset = 0; |
| 494 | int i; |
| 495 | enum lttng_event_rule_status status; |
| 496 | const struct lttng_event_rule_user_tracepoint_comm *tracepoint_comm; |
| 497 | const char *pattern; |
| 498 | const char *filter_expression = NULL; |
| 499 | const char **exclusions = NULL; |
| 500 | const uint32_t *exclusion_len; |
| 501 | const char *exclusion; |
| 502 | struct lttng_buffer_view current_buffer_view; |
| 503 | struct lttng_event_rule *rule = NULL; |
| 504 | struct lttng_log_level_rule *log_level_rule = NULL; |
| 505 | |
| 506 | if (!_event_rule) { |
| 507 | ret = -1; |
| 508 | goto end; |
| 509 | } |
| 510 | |
| 511 | current_buffer_view = lttng_buffer_view_from_view( |
| 512 | &view->buffer, offset, sizeof(*tracepoint_comm)); |
| 513 | if (!lttng_buffer_view_is_valid(¤t_buffer_view)) { |
| 514 | ERR("Failed to initialize from malformed event rule tracepoint: buffer too short to contain header."); |
| 515 | ret = -1; |
| 516 | goto end; |
| 517 | } |
| 518 | |
| 519 | tracepoint_comm = (typeof(tracepoint_comm)) current_buffer_view.data; |
| 520 | |
| 521 | rule = lttng_event_rule_user_tracepoint_create(); |
| 522 | if (!rule) { |
| 523 | ERR("Failed to create event rule user tracepoint."); |
| 524 | ret = -1; |
| 525 | goto end; |
| 526 | } |
| 527 | |
| 528 | /* Skip to payload. */ |
| 529 | offset += current_buffer_view.size; |
| 530 | |
| 531 | /* Map the pattern. */ |
| 532 | current_buffer_view = lttng_buffer_view_from_view( |
| 533 | &view->buffer, offset, tracepoint_comm->pattern_len); |
| 534 | |
| 535 | if (!lttng_buffer_view_is_valid(¤t_buffer_view)) { |
| 536 | ret = -1; |
| 537 | goto end; |
| 538 | } |
| 539 | |
| 540 | pattern = current_buffer_view.data; |
| 541 | if (!lttng_buffer_view_contains_string(¤t_buffer_view, pattern, |
| 542 | tracepoint_comm->pattern_len)) { |
| 543 | ret = -1; |
| 544 | goto end; |
| 545 | } |
| 546 | |
| 547 | /* Skip after the pattern. */ |
| 548 | offset += tracepoint_comm->pattern_len; |
| 549 | |
| 550 | if (!tracepoint_comm->filter_expression_len) { |
| 551 | goto skip_filter_expression; |
| 552 | } |
| 553 | |
| 554 | /* Map the filter_expression. */ |
| 555 | current_buffer_view = lttng_buffer_view_from_view(&view->buffer, offset, |
| 556 | tracepoint_comm->filter_expression_len); |
| 557 | if (!lttng_buffer_view_is_valid(¤t_buffer_view)) { |
| 558 | ret = -1; |
| 559 | goto end; |
| 560 | } |
| 561 | |
| 562 | filter_expression = current_buffer_view.data; |
| 563 | if (!lttng_buffer_view_contains_string(¤t_buffer_view, |
| 564 | filter_expression, |
| 565 | tracepoint_comm->filter_expression_len)) { |
| 566 | ret = -1; |
| 567 | goto end; |
| 568 | } |
| 569 | |
| 570 | /* Skip after the pattern. */ |
| 571 | offset += tracepoint_comm->filter_expression_len; |
| 572 | |
| 573 | skip_filter_expression: |
| 574 | if (!tracepoint_comm->log_level_rule_len) { |
| 575 | goto skip_log_level_rule; |
| 576 | } |
| 577 | |
| 578 | { |
| 579 | /* Map the log level rule. */ |
| 580 | struct lttng_payload_view current_payload_view = |
| 581 | lttng_payload_view_from_view(view, offset, |
| 582 | tracepoint_comm->log_level_rule_len); |
| 583 | |
| 584 | ret = lttng_log_level_rule_create_from_payload( |
| 585 | ¤t_payload_view, &log_level_rule); |
| 586 | if (ret < 0) { |
| 587 | ret = -1; |
| 588 | goto end; |
| 589 | } |
| 590 | |
| 591 | assert(ret == tracepoint_comm->log_level_rule_len); |
| 592 | } |
| 593 | |
| 594 | /* Skip after the log level rule. */ |
| 595 | offset += tracepoint_comm->log_level_rule_len; |
| 596 | |
| 597 | skip_log_level_rule: |
| 598 | for (i = 0; i < tracepoint_comm->exclusions_count; i++) { |
| 599 | current_buffer_view = lttng_buffer_view_from_view( |
| 600 | &view->buffer, offset, sizeof(*exclusion_len)); |
| 601 | if (!lttng_buffer_view_is_valid(¤t_buffer_view)) { |
| 602 | ret = -1; |
| 603 | goto end; |
| 604 | } |
| 605 | |
| 606 | exclusion_len = (typeof(exclusion_len)) current_buffer_view.data; |
| 607 | offset += sizeof(*exclusion_len); |
| 608 | |
| 609 | current_buffer_view = lttng_buffer_view_from_view( |
| 610 | &view->buffer, offset, *exclusion_len); |
| 611 | if (!lttng_buffer_view_is_valid(¤t_buffer_view)) { |
| 612 | ret = -1; |
| 613 | goto end; |
| 614 | } |
| 615 | |
| 616 | exclusion = current_buffer_view.data; |
| 617 | if (!lttng_buffer_view_contains_string(¤t_buffer_view, |
| 618 | exclusion, *exclusion_len)) { |
| 619 | ret = -1; |
| 620 | goto end; |
| 621 | } |
| 622 | |
| 623 | status = lttng_event_rule_user_tracepoint_add_name_pattern_exclusion(rule, exclusion); |
| 624 | if (status != LTTNG_EVENT_RULE_STATUS_OK) { |
| 625 | ERR("Failed to add event rule user tracepoint exclusion \"%s\".", |
| 626 | exclusion); |
| 627 | ret = -1; |
| 628 | goto end; |
| 629 | } |
| 630 | |
| 631 | /* Skip to next exclusion. */ |
| 632 | offset += *exclusion_len; |
| 633 | } |
| 634 | |
| 635 | status = lttng_event_rule_user_tracepoint_set_name_pattern(rule, pattern); |
| 636 | if (status != LTTNG_EVENT_RULE_STATUS_OK) { |
| 637 | ERR("Failed to set event rule user tracepoint pattern."); |
| 638 | ret = -1; |
| 639 | goto end; |
| 640 | } |
| 641 | |
| 642 | if (filter_expression) { |
| 643 | status = lttng_event_rule_user_tracepoint_set_filter( |
| 644 | rule, filter_expression); |
| 645 | if (status != LTTNG_EVENT_RULE_STATUS_OK) { |
| 646 | ERR("Failed to set event rule user tracepoint pattern."); |
| 647 | ret = -1; |
| 648 | goto end; |
| 649 | } |
| 650 | } |
| 651 | |
| 652 | if (log_level_rule) { |
| 653 | status = lttng_event_rule_user_tracepoint_set_log_level_rule( |
| 654 | rule, log_level_rule); |
| 655 | if (status != LTTNG_EVENT_RULE_STATUS_OK) { |
| 656 | ERR("Failed to set event rule user tracepoint log level rule."); |
| 657 | ret = -1; |
| 658 | goto end; |
| 659 | } |
| 660 | } |
| 661 | |
| 662 | *_event_rule = rule; |
| 663 | rule = NULL; |
| 664 | ret = offset; |
| 665 | end: |
| 666 | free(exclusions); |
| 667 | lttng_log_level_rule_destroy(log_level_rule); |
| 668 | lttng_event_rule_destroy(rule); |
| 669 | return ret; |
| 670 | } |
| 671 | |
| 672 | enum lttng_event_rule_status lttng_event_rule_user_tracepoint_set_name_pattern( |
| 673 | struct lttng_event_rule *rule, const char *pattern) |
| 674 | { |
| 675 | char *pattern_copy = NULL; |
| 676 | struct lttng_event_rule_user_tracepoint *tracepoint; |
| 677 | enum lttng_event_rule_status status = LTTNG_EVENT_RULE_STATUS_OK; |
| 678 | |
| 679 | if (!rule || !IS_USER_TRACEPOINT_EVENT_RULE(rule) || !pattern || |
| 680 | strlen(pattern) == 0) { |
| 681 | status = LTTNG_EVENT_RULE_STATUS_INVALID; |
| 682 | goto end; |
| 683 | } |
| 684 | |
| 685 | tracepoint = container_of( |
| 686 | rule, struct lttng_event_rule_user_tracepoint, parent); |
| 687 | pattern_copy = strdup(pattern); |
| 688 | if (!pattern_copy) { |
| 689 | status = LTTNG_EVENT_RULE_STATUS_ERROR; |
| 690 | goto end; |
| 691 | } |
| 692 | |
| 693 | /* Normalize the pattern. */ |
| 694 | strutils_normalize_star_glob_pattern(pattern_copy); |
| 695 | |
| 696 | free(tracepoint->pattern); |
| 697 | |
| 698 | tracepoint->pattern = pattern_copy; |
| 699 | pattern_copy = NULL; |
| 700 | end: |
| 701 | return status; |
| 702 | } |
| 703 | |
| 704 | enum lttng_event_rule_status lttng_event_rule_user_tracepoint_get_name_pattern( |
| 705 | const struct lttng_event_rule *rule, const char **pattern) |
| 706 | { |
| 707 | struct lttng_event_rule_user_tracepoint *tracepoint; |
| 708 | enum lttng_event_rule_status status = LTTNG_EVENT_RULE_STATUS_OK; |
| 709 | |
| 710 | if (!rule || !IS_USER_TRACEPOINT_EVENT_RULE(rule) || !pattern) { |
| 711 | status = LTTNG_EVENT_RULE_STATUS_INVALID; |
| 712 | goto end; |
| 713 | } |
| 714 | |
| 715 | tracepoint = container_of( |
| 716 | rule, struct lttng_event_rule_user_tracepoint, parent); |
| 717 | if (!tracepoint->pattern) { |
| 718 | status = LTTNG_EVENT_RULE_STATUS_UNSET; |
| 719 | goto end; |
| 720 | } |
| 721 | |
| 722 | *pattern = tracepoint->pattern; |
| 723 | end: |
| 724 | return status; |
| 725 | } |
| 726 | |
| 727 | enum lttng_event_rule_status lttng_event_rule_user_tracepoint_set_filter( |
| 728 | struct lttng_event_rule *rule, const char *expression) |
| 729 | { |
| 730 | char *expression_copy = NULL; |
| 731 | struct lttng_event_rule_user_tracepoint *tracepoint; |
| 732 | enum lttng_event_rule_status status = LTTNG_EVENT_RULE_STATUS_OK; |
| 733 | |
| 734 | if (!rule || !IS_USER_TRACEPOINT_EVENT_RULE(rule) || !expression || |
| 735 | strlen(expression) == 0) { |
| 736 | status = LTTNG_EVENT_RULE_STATUS_INVALID; |
| 737 | goto end; |
| 738 | } |
| 739 | |
| 740 | tracepoint = container_of( |
| 741 | rule, struct lttng_event_rule_user_tracepoint, parent); |
| 742 | expression_copy = strdup(expression); |
| 743 | if (!expression_copy) { |
| 744 | PERROR("Failed to copy filter expression"); |
| 745 | status = LTTNG_EVENT_RULE_STATUS_ERROR; |
| 746 | goto end; |
| 747 | } |
| 748 | |
| 749 | if (tracepoint->filter_expression) { |
| 750 | free(tracepoint->filter_expression); |
| 751 | } |
| 752 | |
| 753 | tracepoint->filter_expression = expression_copy; |
| 754 | expression_copy = NULL; |
| 755 | end: |
| 756 | return status; |
| 757 | } |
| 758 | |
| 759 | enum lttng_event_rule_status lttng_event_rule_user_tracepoint_get_filter( |
| 760 | const struct lttng_event_rule *rule, const char **expression) |
| 761 | { |
| 762 | struct lttng_event_rule_user_tracepoint *tracepoint; |
| 763 | enum lttng_event_rule_status status = LTTNG_EVENT_RULE_STATUS_OK; |
| 764 | |
| 765 | if (!rule || !IS_USER_TRACEPOINT_EVENT_RULE(rule) || !expression) { |
| 766 | status = LTTNG_EVENT_RULE_STATUS_INVALID; |
| 767 | goto end; |
| 768 | } |
| 769 | |
| 770 | tracepoint = container_of( |
| 771 | rule, struct lttng_event_rule_user_tracepoint, parent); |
| 772 | if (!tracepoint->filter_expression) { |
| 773 | status = LTTNG_EVENT_RULE_STATUS_UNSET; |
| 774 | goto end; |
| 775 | } |
| 776 | |
| 777 | *expression = tracepoint->filter_expression; |
| 778 | end: |
| 779 | return status; |
| 780 | } |
| 781 | |
| 782 | static bool log_level_rule_valid(const struct lttng_log_level_rule *rule) |
| 783 | { |
| 784 | bool valid = false; |
| 785 | enum lttng_log_level_rule_status status; |
| 786 | int level; |
| 787 | |
| 788 | switch (lttng_log_level_rule_get_type(rule)) { |
| 789 | case LTTNG_LOG_LEVEL_RULE_TYPE_EXACTLY: |
| 790 | status = lttng_log_level_rule_exactly_get_level(rule, &level); |
| 791 | break; |
| 792 | case LTTNG_LOG_LEVEL_RULE_TYPE_AT_LEAST_AS_SEVERE_AS: |
| 793 | status = lttng_log_level_rule_at_least_as_severe_as_get_level( |
| 794 | rule, &level); |
| 795 | break; |
| 796 | default: |
| 797 | abort(); |
| 798 | } |
| 799 | |
| 800 | assert(status == LTTNG_LOG_LEVEL_RULE_STATUS_OK); |
| 801 | |
| 802 | if (level < LTTNG_LOGLEVEL_EMERG) { |
| 803 | /* Invalid. */ |
| 804 | goto end; |
| 805 | } |
| 806 | if (level > LTTNG_LOGLEVEL_DEBUG) { |
| 807 | /* Invalid. */ |
| 808 | goto end; |
| 809 | } |
| 810 | |
| 811 | valid = true; |
| 812 | |
| 813 | end: |
| 814 | return valid; |
| 815 | } |
| 816 | |
| 817 | enum lttng_event_rule_status lttng_event_rule_user_tracepoint_set_log_level_rule( |
| 818 | struct lttng_event_rule *rule, |
| 819 | const struct lttng_log_level_rule *log_level_rule) |
| 820 | { |
| 821 | struct lttng_event_rule_user_tracepoint *tracepoint; |
| 822 | enum lttng_event_rule_status status = LTTNG_EVENT_RULE_STATUS_OK; |
| 823 | struct lttng_log_level_rule *copy = NULL; |
| 824 | |
| 825 | if (!rule || !IS_USER_TRACEPOINT_EVENT_RULE(rule)) { |
| 826 | status = LTTNG_EVENT_RULE_STATUS_INVALID; |
| 827 | goto end; |
| 828 | } |
| 829 | |
| 830 | tracepoint = container_of( |
| 831 | rule, struct lttng_event_rule_user_tracepoint, parent); |
| 832 | |
| 833 | if (!log_level_rule_valid(log_level_rule)) { |
| 834 | status = LTTNG_EVENT_RULE_STATUS_INVALID; |
| 835 | goto end; |
| 836 | } |
| 837 | |
| 838 | copy = lttng_log_level_rule_copy(log_level_rule); |
| 839 | if (copy == NULL) { |
| 840 | status = LTTNG_EVENT_RULE_STATUS_ERROR; |
| 841 | goto end; |
| 842 | } |
| 843 | |
| 844 | if (tracepoint->log_level_rule) { |
| 845 | lttng_log_level_rule_destroy(tracepoint->log_level_rule); |
| 846 | } |
| 847 | |
| 848 | tracepoint->log_level_rule = copy; |
| 849 | |
| 850 | end: |
| 851 | return status; |
| 852 | } |
| 853 | |
| 854 | enum lttng_event_rule_status lttng_event_rule_user_tracepoint_get_log_level_rule( |
| 855 | const struct lttng_event_rule *rule, |
| 856 | const struct lttng_log_level_rule **log_level_rule |
| 857 | ) |
| 858 | { |
| 859 | struct lttng_event_rule_user_tracepoint *tracepoint; |
| 860 | enum lttng_event_rule_status status = LTTNG_EVENT_RULE_STATUS_OK; |
| 861 | |
| 862 | if (!rule || !IS_USER_TRACEPOINT_EVENT_RULE(rule) || !log_level_rule) { |
| 863 | status = LTTNG_EVENT_RULE_STATUS_INVALID; |
| 864 | goto end; |
| 865 | } |
| 866 | |
| 867 | tracepoint = container_of( |
| 868 | rule, struct lttng_event_rule_user_tracepoint, parent); |
| 869 | if (tracepoint->log_level_rule == NULL) { |
| 870 | status = LTTNG_EVENT_RULE_STATUS_UNSET; |
| 871 | goto end; |
| 872 | } |
| 873 | |
| 874 | *log_level_rule = tracepoint->log_level_rule; |
| 875 | end: |
| 876 | return status; |
| 877 | } |
| 878 | |
| 879 | enum lttng_event_rule_status lttng_event_rule_user_tracepoint_add_name_pattern_exclusion( |
| 880 | struct lttng_event_rule *rule, |
| 881 | const char *exclusion) |
| 882 | { |
| 883 | int ret; |
| 884 | char *exclusion_copy = NULL; |
| 885 | struct lttng_event_rule_user_tracepoint *tracepoint; |
| 886 | enum lttng_event_rule_status status = LTTNG_EVENT_RULE_STATUS_OK; |
| 887 | |
| 888 | if (!rule || !IS_USER_TRACEPOINT_EVENT_RULE(rule) || |
| 889 | !exclusion) { |
| 890 | status = LTTNG_EVENT_RULE_STATUS_INVALID; |
| 891 | goto end; |
| 892 | } |
| 893 | |
| 894 | tracepoint = container_of( |
| 895 | rule, struct lttng_event_rule_user_tracepoint, parent); |
| 896 | |
| 897 | if (strlen(exclusion) >= LTTNG_SYMBOL_NAME_LEN) { |
| 898 | status = LTTNG_EVENT_RULE_STATUS_INVALID; |
| 899 | goto end; |
| 900 | } |
| 901 | |
| 902 | exclusion_copy = strdup(exclusion); |
| 903 | if (!exclusion_copy) { |
| 904 | status = LTTNG_EVENT_RULE_STATUS_ERROR; |
| 905 | goto end; |
| 906 | } |
| 907 | |
| 908 | ret = lttng_dynamic_pointer_array_add_pointer(&tracepoint->exclusions, |
| 909 | exclusion_copy); |
| 910 | if (ret < 0) { |
| 911 | status = LTTNG_EVENT_RULE_STATUS_ERROR; |
| 912 | goto end; |
| 913 | } |
| 914 | |
| 915 | exclusion_copy = NULL; |
| 916 | end: |
| 917 | free(exclusion_copy); |
| 918 | return status; |
| 919 | } |
| 920 | |
| 921 | enum lttng_event_rule_status lttng_event_rule_user_tracepoint_get_name_pattern_exclusion_count( |
| 922 | const struct lttng_event_rule *rule, unsigned int *count) |
| 923 | { |
| 924 | struct lttng_event_rule_user_tracepoint *tracepoint; |
| 925 | enum lttng_event_rule_status status = LTTNG_EVENT_RULE_STATUS_OK; |
| 926 | |
| 927 | if (!rule || !IS_USER_TRACEPOINT_EVENT_RULE(rule) || !count) { |
| 928 | status = LTTNG_EVENT_RULE_STATUS_INVALID; |
| 929 | goto end; |
| 930 | } |
| 931 | |
| 932 | tracepoint = container_of( |
| 933 | rule, struct lttng_event_rule_user_tracepoint, parent); |
| 934 | *count = lttng_dynamic_pointer_array_get_count(&tracepoint->exclusions); |
| 935 | end: |
| 936 | return status; |
| 937 | } |
| 938 | |
| 939 | enum lttng_event_rule_status lttng_event_rule_user_tracepoint_get_name_pattern_exclusion_at_index( |
| 940 | const struct lttng_event_rule *rule, |
| 941 | unsigned int index, |
| 942 | const char **exclusion) |
| 943 | { |
| 944 | unsigned int count; |
| 945 | struct lttng_event_rule_user_tracepoint *tracepoint; |
| 946 | enum lttng_event_rule_status status = LTTNG_EVENT_RULE_STATUS_OK; |
| 947 | |
| 948 | if (!rule || !IS_USER_TRACEPOINT_EVENT_RULE(rule) || !exclusion) { |
| 949 | status = LTTNG_EVENT_RULE_STATUS_INVALID; |
| 950 | goto end; |
| 951 | } |
| 952 | |
| 953 | tracepoint = container_of( |
| 954 | rule, struct lttng_event_rule_user_tracepoint, parent); |
| 955 | if (lttng_event_rule_user_tracepoint_get_name_pattern_exclusion_count(rule, &count) != |
| 956 | LTTNG_EVENT_RULE_STATUS_OK) { |
| 957 | goto end; |
| 958 | } |
| 959 | |
| 960 | if (index >= count) { |
| 961 | goto end; |
| 962 | } |
| 963 | |
| 964 | *exclusion = lttng_dynamic_pointer_array_get_pointer( |
| 965 | &tracepoint->exclusions, index); |
| 966 | end: |
| 967 | return status; |
| 968 | } |