| 1 | /* |
| 2 | * Copyright (C) 2011 David Goulet <david.goulet@polymtl.ca> |
| 3 | * Copyright (C) 2016 Jérémie Galarneau <jeremie.galarneau@efficios.com> |
| 4 | * |
| 5 | * SPDX-License-Identifier: GPL-2.0-only |
| 6 | * |
| 7 | */ |
| 8 | |
| 9 | #define _LGPL_SOURCE |
| 10 | #include <urcu/list.h> |
| 11 | #include <string.h> |
| 12 | |
| 13 | #include <common/compat/errno.h> |
| 14 | #include <lttng/lttng.h> |
| 15 | #include <lttng/condition/condition.h> |
| 16 | #include <lttng/condition/event-rule-matches.h> |
| 17 | #include <lttng/event-rule/event-rule.h> |
| 18 | #include <lttng/event-rule/event-rule-internal.h> |
| 19 | #include <common/bytecode/bytecode.h> |
| 20 | #include <common/error.h> |
| 21 | #include <common/sessiond-comm/sessiond-comm.h> |
| 22 | #include <common/filter.h> |
| 23 | #include <common/context.h> |
| 24 | |
| 25 | #include "channel.h" |
| 26 | #include "event.h" |
| 27 | #include "kernel.h" |
| 28 | #include "lttng-sessiond.h" |
| 29 | #include "lttng-ust-ctl.h" |
| 30 | #include "lttng-ust-error.h" |
| 31 | #include "ust-app.h" |
| 32 | #include "trace-kernel.h" |
| 33 | #include "trace-ust.h" |
| 34 | #include "agent.h" |
| 35 | #include "utils.h" |
| 36 | |
| 37 | /* |
| 38 | * Add unique UST event based on the event name, filter bytecode and loglevel. |
| 39 | */ |
| 40 | static void add_unique_ust_event(struct lttng_ht *ht, |
| 41 | struct ltt_ust_event *event) |
| 42 | { |
| 43 | struct cds_lfht_node *node_ptr; |
| 44 | struct ltt_ust_ht_key key; |
| 45 | |
| 46 | assert(ht); |
| 47 | assert(ht->ht); |
| 48 | assert(event); |
| 49 | |
| 50 | key.name = event->attr.name; |
| 51 | key.filter = (struct lttng_bytecode *) event->filter; |
| 52 | key.loglevel_type = event->attr.loglevel_type; |
| 53 | key.loglevel_value = event->attr.loglevel; |
| 54 | key.exclusion = event->exclusion; |
| 55 | |
| 56 | node_ptr = cds_lfht_add_unique(ht->ht, |
| 57 | ht->hash_fct(event->node.key, lttng_ht_seed), |
| 58 | trace_ust_ht_match_event, &key, &event->node.node); |
| 59 | assert(node_ptr == &event->node.node); |
| 60 | } |
| 61 | |
| 62 | /* |
| 63 | * Disable kernel tracepoint events for a channel from the kernel session of |
| 64 | * a specified event_name and event type. |
| 65 | * On type LTTNG_EVENT_ALL all events with event_name are disabled. |
| 66 | * If event_name is NULL all events of the specified type are disabled. |
| 67 | */ |
| 68 | int event_kernel_disable_event(struct ltt_kernel_channel *kchan, |
| 69 | const char *event_name, enum lttng_event_type type) |
| 70 | { |
| 71 | int ret, error = 0, found = 0; |
| 72 | struct ltt_kernel_event *kevent; |
| 73 | |
| 74 | assert(kchan); |
| 75 | |
| 76 | /* For each event in the kernel session */ |
| 77 | cds_list_for_each_entry(kevent, &kchan->events_list.head, list) { |
| 78 | if (type != LTTNG_EVENT_ALL && kevent->type != type) |
| 79 | continue; |
| 80 | if (event_name != NULL && strcmp(event_name, kevent->event->name)) { |
| 81 | continue; |
| 82 | } |
| 83 | found++; |
| 84 | ret = kernel_disable_event(kevent); |
| 85 | if (ret < 0) { |
| 86 | error = 1; |
| 87 | continue; |
| 88 | } |
| 89 | } |
| 90 | DBG("Disable kernel event: found %d events with name: %s and type: %d", |
| 91 | found, event_name ? event_name : "NULL", type); |
| 92 | |
| 93 | if (event_name != NULL && !found) { |
| 94 | ret = LTTNG_ERR_NO_EVENT; |
| 95 | } else { |
| 96 | ret = error ? LTTNG_ERR_KERN_DISABLE_FAIL : LTTNG_OK; |
| 97 | } |
| 98 | |
| 99 | return ret; |
| 100 | } |
| 101 | |
| 102 | /* |
| 103 | * Enable kernel tracepoint event for a channel from the kernel session. |
| 104 | * We own filter_expression and filter. |
| 105 | */ |
| 106 | int event_kernel_enable_event(struct ltt_kernel_channel *kchan, |
| 107 | struct lttng_event *event, char *filter_expression, |
| 108 | struct lttng_bytecode *filter) |
| 109 | { |
| 110 | int ret; |
| 111 | struct ltt_kernel_event *kevent; |
| 112 | |
| 113 | assert(kchan); |
| 114 | assert(event); |
| 115 | |
| 116 | kevent = trace_kernel_find_event(event->name, kchan, |
| 117 | event->type, filter); |
| 118 | if (kevent == NULL) { |
| 119 | ret = kernel_create_event(event, kchan, filter_expression, filter); |
| 120 | /* We have passed ownership */ |
| 121 | filter_expression = NULL; |
| 122 | filter = NULL; |
| 123 | if (ret) { |
| 124 | goto end; |
| 125 | } |
| 126 | } else if (kevent->enabled == 0) { |
| 127 | ret = kernel_enable_event(kevent); |
| 128 | if (ret < 0) { |
| 129 | ret = LTTNG_ERR_KERN_ENABLE_FAIL; |
| 130 | goto end; |
| 131 | } |
| 132 | } else { |
| 133 | /* At this point, the event is considered enabled */ |
| 134 | ret = LTTNG_ERR_KERN_EVENT_EXIST; |
| 135 | goto end; |
| 136 | } |
| 137 | |
| 138 | ret = LTTNG_OK; |
| 139 | end: |
| 140 | free(filter_expression); |
| 141 | free(filter); |
| 142 | return ret; |
| 143 | } |
| 144 | |
| 145 | /* |
| 146 | * ============================ |
| 147 | * UST : The Ultimate Frontier! |
| 148 | * ============================ |
| 149 | */ |
| 150 | |
| 151 | /* |
| 152 | * Enable UST tracepoint event for a channel from a UST session. |
| 153 | * We own filter_expression, filter, and exclusion. |
| 154 | */ |
| 155 | int event_ust_enable_tracepoint(struct ltt_ust_session *usess, |
| 156 | struct ltt_ust_channel *uchan, struct lttng_event *event, |
| 157 | char *filter_expression, |
| 158 | struct lttng_bytecode *filter, |
| 159 | struct lttng_event_exclusion *exclusion, |
| 160 | bool internal_event) |
| 161 | { |
| 162 | int ret = LTTNG_OK, to_create = 0; |
| 163 | struct ltt_ust_event *uevent; |
| 164 | |
| 165 | assert(usess); |
| 166 | assert(uchan); |
| 167 | assert(event); |
| 168 | |
| 169 | rcu_read_lock(); |
| 170 | |
| 171 | uevent = trace_ust_find_event(uchan->events, event->name, filter, |
| 172 | (enum lttng_ust_abi_loglevel_type) event->loglevel_type, |
| 173 | event->loglevel, exclusion); |
| 174 | if (!uevent) { |
| 175 | ret = trace_ust_create_event(event, filter_expression, |
| 176 | filter, exclusion, internal_event, &uevent); |
| 177 | /* We have passed ownership */ |
| 178 | filter_expression = NULL; |
| 179 | filter = NULL; |
| 180 | exclusion = NULL; |
| 181 | if (ret != LTTNG_OK) { |
| 182 | goto error; |
| 183 | } |
| 184 | |
| 185 | /* Valid to set it after the goto error since uevent is still NULL */ |
| 186 | to_create = 1; |
| 187 | } |
| 188 | |
| 189 | if (uevent->enabled) { |
| 190 | /* It's already enabled so everything is OK */ |
| 191 | assert(!to_create); |
| 192 | ret = LTTNG_ERR_UST_EVENT_ENABLED; |
| 193 | goto end; |
| 194 | } |
| 195 | |
| 196 | uevent->enabled = 1; |
| 197 | if (to_create) { |
| 198 | /* Add ltt ust event to channel */ |
| 199 | add_unique_ust_event(uchan->events, uevent); |
| 200 | } |
| 201 | |
| 202 | if (!usess->active) { |
| 203 | goto end; |
| 204 | } |
| 205 | |
| 206 | if (to_create) { |
| 207 | /* Create event on all UST registered apps for session */ |
| 208 | ret = ust_app_create_event_glb(usess, uchan, uevent); |
| 209 | } else { |
| 210 | /* Enable event on all UST registered apps for session */ |
| 211 | ret = ust_app_enable_event_glb(usess, uchan, uevent); |
| 212 | } |
| 213 | |
| 214 | if (ret < 0) { |
| 215 | if (ret == -LTTNG_UST_ERR_EXIST) { |
| 216 | ret = LTTNG_ERR_UST_EVENT_EXIST; |
| 217 | goto end; |
| 218 | } else { |
| 219 | ret = LTTNG_ERR_UST_ENABLE_FAIL; |
| 220 | goto error; |
| 221 | } |
| 222 | } |
| 223 | |
| 224 | DBG("Event UST %s %s in channel %s", uevent->attr.name, |
| 225 | to_create ? "created" : "enabled", uchan->name); |
| 226 | |
| 227 | ret = LTTNG_OK; |
| 228 | |
| 229 | end: |
| 230 | rcu_read_unlock(); |
| 231 | free(filter_expression); |
| 232 | free(filter); |
| 233 | free(exclusion); |
| 234 | return ret; |
| 235 | |
| 236 | error: |
| 237 | /* |
| 238 | * Only destroy event on creation time (not enabling time) because if the |
| 239 | * event is found in the channel (to_create == 0), it means that at some |
| 240 | * point the enable_event worked and it's thus valid to keep it alive. |
| 241 | * Destroying it also implies that we also destroy it's shadow copy to sync |
| 242 | * everyone up. |
| 243 | */ |
| 244 | if (to_create) { |
| 245 | /* In this code path, the uevent was not added to the hash table */ |
| 246 | trace_ust_destroy_event(uevent); |
| 247 | } |
| 248 | rcu_read_unlock(); |
| 249 | free(filter_expression); |
| 250 | free(filter); |
| 251 | free(exclusion); |
| 252 | return ret; |
| 253 | } |
| 254 | |
| 255 | /* |
| 256 | * Disable UST tracepoint of a channel from a UST session. |
| 257 | */ |
| 258 | int event_ust_disable_tracepoint(struct ltt_ust_session *usess, |
| 259 | struct ltt_ust_channel *uchan, const char *event_name) |
| 260 | { |
| 261 | int ret; |
| 262 | struct ltt_ust_event *uevent; |
| 263 | struct lttng_ht_node_str *node; |
| 264 | struct lttng_ht_iter iter; |
| 265 | struct lttng_ht *ht; |
| 266 | |
| 267 | assert(usess); |
| 268 | assert(uchan); |
| 269 | assert(event_name); |
| 270 | |
| 271 | ht = uchan->events; |
| 272 | |
| 273 | rcu_read_lock(); |
| 274 | |
| 275 | /* |
| 276 | * We use a custom lookup since we need the iterator for the next_duplicate |
| 277 | * call in the do while loop below. |
| 278 | */ |
| 279 | cds_lfht_lookup(ht->ht, ht->hash_fct((void *) event_name, lttng_ht_seed), |
| 280 | trace_ust_ht_match_event_by_name, event_name, &iter.iter); |
| 281 | node = lttng_ht_iter_get_node_str(&iter); |
| 282 | if (node == NULL) { |
| 283 | DBG2("Trace UST event NOT found by name %s", event_name); |
| 284 | ret = LTTNG_ERR_UST_EVENT_NOT_FOUND; |
| 285 | goto error; |
| 286 | } |
| 287 | |
| 288 | do { |
| 289 | uevent = caa_container_of(node, struct ltt_ust_event, node); |
| 290 | assert(uevent); |
| 291 | |
| 292 | if (uevent->enabled == 0) { |
| 293 | /* It's already disabled so everything is OK */ |
| 294 | goto next; |
| 295 | } |
| 296 | uevent->enabled = 0; |
| 297 | DBG2("Event UST %s disabled in channel %s", uevent->attr.name, |
| 298 | uchan->name); |
| 299 | |
| 300 | if (!usess->active) { |
| 301 | goto next; |
| 302 | } |
| 303 | ret = ust_app_disable_event_glb(usess, uchan, uevent); |
| 304 | if (ret < 0 && ret != -LTTNG_UST_ERR_EXIST) { |
| 305 | ret = LTTNG_ERR_UST_DISABLE_FAIL; |
| 306 | goto error; |
| 307 | } |
| 308 | next: |
| 309 | /* Get next duplicate event by name. */ |
| 310 | cds_lfht_next_duplicate(ht->ht, trace_ust_ht_match_event_by_name, |
| 311 | event_name, &iter.iter); |
| 312 | node = lttng_ht_iter_get_node_str(&iter); |
| 313 | } while (node); |
| 314 | |
| 315 | ret = LTTNG_OK; |
| 316 | |
| 317 | error: |
| 318 | rcu_read_unlock(); |
| 319 | return ret; |
| 320 | } |
| 321 | |
| 322 | /* |
| 323 | * Disable all UST tracepoints for a channel from a UST session. |
| 324 | */ |
| 325 | int event_ust_disable_all_tracepoints(struct ltt_ust_session *usess, |
| 326 | struct ltt_ust_channel *uchan) |
| 327 | { |
| 328 | int ret, i, size, error = 0; |
| 329 | struct lttng_ht_iter iter; |
| 330 | struct ltt_ust_event *uevent = NULL; |
| 331 | struct lttng_event *events = NULL; |
| 332 | |
| 333 | assert(usess); |
| 334 | assert(uchan); |
| 335 | |
| 336 | rcu_read_lock(); |
| 337 | |
| 338 | /* Disabling existing events */ |
| 339 | cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, |
| 340 | node.node) { |
| 341 | if (uevent->enabled == 1) { |
| 342 | ret = event_ust_disable_tracepoint(usess, uchan, |
| 343 | uevent->attr.name); |
| 344 | if (ret < 0) { |
| 345 | error = LTTNG_ERR_UST_DISABLE_FAIL; |
| 346 | continue; |
| 347 | } |
| 348 | } |
| 349 | } |
| 350 | |
| 351 | /* Get all UST available events */ |
| 352 | size = ust_app_list_events(&events); |
| 353 | if (size < 0) { |
| 354 | ret = LTTNG_ERR_UST_LIST_FAIL; |
| 355 | goto error; |
| 356 | } |
| 357 | |
| 358 | for (i = 0; i < size; i++) { |
| 359 | ret = event_ust_disable_tracepoint(usess, uchan, |
| 360 | events[i].name); |
| 361 | if (ret < 0) { |
| 362 | /* Continue to disable the rest... */ |
| 363 | error = LTTNG_ERR_UST_DISABLE_FAIL; |
| 364 | continue; |
| 365 | } |
| 366 | } |
| 367 | |
| 368 | ret = error ? error : LTTNG_OK; |
| 369 | error: |
| 370 | rcu_read_unlock(); |
| 371 | free(events); |
| 372 | return ret; |
| 373 | } |
| 374 | |
| 375 | static void agent_enable_all(struct agent *agt) |
| 376 | { |
| 377 | struct agent_event *aevent; |
| 378 | struct lttng_ht_iter iter; |
| 379 | |
| 380 | /* Flag every event as enabled. */ |
| 381 | rcu_read_lock(); |
| 382 | cds_lfht_for_each_entry ( |
| 383 | agt->events->ht, &iter.iter, aevent, node.node) { |
| 384 | aevent->enabled_count++; |
| 385 | } |
| 386 | rcu_read_unlock(); |
| 387 | } |
| 388 | |
| 389 | /* |
| 390 | * Enable all agent event for a given UST session. |
| 391 | * |
| 392 | * Return LTTNG_OK on success or else a LTTNG_ERR* code. |
| 393 | */ |
| 394 | int event_agent_enable_all(struct ltt_ust_session *usess, |
| 395 | struct agent *agt, struct lttng_event *event, |
| 396 | struct lttng_bytecode *filter ,char *filter_expression) |
| 397 | { |
| 398 | int ret; |
| 399 | |
| 400 | assert(usess); |
| 401 | |
| 402 | DBG("Event agent enabling ALL events for session %" PRIu64, usess->id); |
| 403 | |
| 404 | /* Enable event on agent application through TCP socket. */ |
| 405 | ret = event_agent_enable(usess, agt, event, filter, filter_expression); |
| 406 | if (ret != LTTNG_OK) { |
| 407 | goto error; |
| 408 | } |
| 409 | |
| 410 | agent_enable_all(agt); |
| 411 | |
| 412 | ret = LTTNG_OK; |
| 413 | |
| 414 | error: |
| 415 | return ret; |
| 416 | } |
| 417 | |
| 418 | /* |
| 419 | * Check if this event's filter requires the activation of application contexts |
| 420 | * and enable them in the agent. |
| 421 | * TODO: bytecode iterator does not support non-legacy application |
| 422 | * contexts yet. Not an issue for now, since they are not generated by |
| 423 | * the lttng-ctl library. |
| 424 | */ |
| 425 | static int add_filter_app_ctx(struct lttng_bytecode *bytecode, |
| 426 | const char *filter_expression, struct agent *agt) |
| 427 | { |
| 428 | int ret = LTTNG_OK; |
| 429 | char *provider_name = NULL, *ctx_name = NULL; |
| 430 | struct bytecode_symbol_iterator *it = |
| 431 | bytecode_symbol_iterator_create(bytecode); |
| 432 | |
| 433 | if (!it) { |
| 434 | ret = LTTNG_ERR_NOMEM; |
| 435 | goto end; |
| 436 | } |
| 437 | |
| 438 | do { |
| 439 | struct lttng_event_context ctx; |
| 440 | const char *symbol_name = |
| 441 | bytecode_symbol_iterator_get_name(it); |
| 442 | |
| 443 | if (parse_application_context(symbol_name, &provider_name, |
| 444 | &ctx_name)) { |
| 445 | /* Not an application context. */ |
| 446 | continue; |
| 447 | } |
| 448 | |
| 449 | ctx.ctx = LTTNG_EVENT_CONTEXT_APP_CONTEXT; |
| 450 | ctx.u.app_ctx.provider_name = provider_name; |
| 451 | ctx.u.app_ctx.ctx_name = ctx_name; |
| 452 | |
| 453 | /* Recognized an application context. */ |
| 454 | DBG("Enabling event with filter expression \"%s\" requires enabling the %s:%s application context.", |
| 455 | filter_expression, provider_name, ctx_name); |
| 456 | |
| 457 | ret = agent_add_context(&ctx, agt); |
| 458 | if (ret != LTTNG_OK) { |
| 459 | ERR("Failed to add application context %s:%s.", |
| 460 | provider_name, ctx_name); |
| 461 | goto end; |
| 462 | } |
| 463 | |
| 464 | ret = agent_enable_context(&ctx, agt->domain); |
| 465 | if (ret != LTTNG_OK) { |
| 466 | ERR("Failed to enable application context %s:%s.", |
| 467 | provider_name, ctx_name); |
| 468 | goto end; |
| 469 | } |
| 470 | |
| 471 | free(provider_name); |
| 472 | free(ctx_name); |
| 473 | provider_name = ctx_name = NULL; |
| 474 | } while (bytecode_symbol_iterator_next(it) == 0); |
| 475 | end: |
| 476 | free(provider_name); |
| 477 | free(ctx_name); |
| 478 | bytecode_symbol_iterator_destroy(it); |
| 479 | return ret; |
| 480 | } |
| 481 | |
| 482 | static int agent_enable(struct agent *agt, |
| 483 | struct lttng_event *event, |
| 484 | struct lttng_bytecode *filter, |
| 485 | char *filter_expression) |
| 486 | { |
| 487 | int ret, created = 0; |
| 488 | struct agent_event *aevent; |
| 489 | |
| 490 | assert(event); |
| 491 | assert(agt); |
| 492 | |
| 493 | aevent = agent_find_event(event->name, event->loglevel_type, |
| 494 | event->loglevel, filter_expression, agt); |
| 495 | if (!aevent) { |
| 496 | aevent = agent_create_event(event->name, event->loglevel_type, |
| 497 | event->loglevel, filter, |
| 498 | filter_expression); |
| 499 | if (!aevent) { |
| 500 | ret = LTTNG_ERR_NOMEM; |
| 501 | goto error; |
| 502 | } |
| 503 | filter = NULL; |
| 504 | filter_expression = NULL; |
| 505 | created = 1; |
| 506 | assert(!AGENT_EVENT_IS_ENABLED(aevent)); |
| 507 | } |
| 508 | |
| 509 | if (created && aevent->filter) { |
| 510 | ret = add_filter_app_ctx( |
| 511 | aevent->filter, aevent->filter_expression, agt); |
| 512 | if (ret != LTTNG_OK) { |
| 513 | goto error; |
| 514 | } |
| 515 | } |
| 516 | |
| 517 | /* Already enabled? */ |
| 518 | if (AGENT_EVENT_IS_ENABLED(aevent)) { |
| 519 | ret = LTTNG_OK; |
| 520 | goto end; |
| 521 | } |
| 522 | |
| 523 | ret = agent_enable_event(aevent, agt->domain); |
| 524 | if (ret != LTTNG_OK) { |
| 525 | goto error; |
| 526 | } |
| 527 | |
| 528 | /* If the event was created prior to the enable, add it to the domain. */ |
| 529 | if (created) { |
| 530 | agent_add_event(aevent, agt); |
| 531 | } |
| 532 | |
| 533 | ret = LTTNG_OK; |
| 534 | goto end; |
| 535 | |
| 536 | error: |
| 537 | if (created) { |
| 538 | agent_destroy_event(aevent); |
| 539 | } |
| 540 | end: |
| 541 | free(filter); |
| 542 | free(filter_expression); |
| 543 | return ret; |
| 544 | } |
| 545 | |
| 546 | /* |
| 547 | * Enable a single agent event for a given UST session. |
| 548 | * |
| 549 | * Return LTTNG_OK on success or else a LTTNG_ERR* code. |
| 550 | */ |
| 551 | int event_agent_enable(struct ltt_ust_session *usess, |
| 552 | struct agent *agt, |
| 553 | struct lttng_event *event, |
| 554 | struct lttng_bytecode *filter, |
| 555 | char *filter_expression) |
| 556 | { |
| 557 | assert(usess); |
| 558 | assert(event); |
| 559 | assert(agt); |
| 560 | |
| 561 | DBG("Enabling agent event: event pattern = '%s', session id = %" PRIu64 ", loglevel type = %d, loglevel = %d, filter expression = '%s'", |
| 562 | event->name, usess->id, event->loglevel_type, |
| 563 | event->loglevel, |
| 564 | filter_expression ? filter_expression : "(none)"); |
| 565 | |
| 566 | return agent_enable(agt, event, filter, filter_expression); |
| 567 | } |
| 568 | |
| 569 | /* |
| 570 | * Enable a single agent event for a trigger. |
| 571 | * |
| 572 | * Return LTTNG_OK on success or else a LTTNG_ERR* code. |
| 573 | */ |
| 574 | int trigger_agent_enable(const struct lttng_trigger *trigger, struct agent *agt) |
| 575 | { |
| 576 | int ret; |
| 577 | enum lttng_condition_status c_status; |
| 578 | enum lttng_trigger_status t_status; |
| 579 | enum lttng_domain_type d_type; |
| 580 | const struct lttng_condition *condition; |
| 581 | const struct lttng_event_rule *rule; |
| 582 | const char *filter_expression; |
| 583 | char *filter_expression_copy = NULL; |
| 584 | const struct lttng_bytecode *filter_bytecode; |
| 585 | struct lttng_bytecode *filter_bytecode_copy = NULL; |
| 586 | struct lttng_event *event = NULL; |
| 587 | uid_t trigger_owner_uid = 0; |
| 588 | const char *trigger_name; |
| 589 | |
| 590 | assert(trigger); |
| 591 | assert(agt); |
| 592 | |
| 593 | t_status = lttng_trigger_get_name(trigger, &trigger_name); |
| 594 | if (t_status != LTTNG_TRIGGER_STATUS_OK) { |
| 595 | trigger_name = "(anonymous)"; |
| 596 | } |
| 597 | |
| 598 | t_status = lttng_trigger_get_owner_uid(trigger, &trigger_owner_uid); |
| 599 | assert(t_status == LTTNG_TRIGGER_STATUS_OK); |
| 600 | |
| 601 | condition = lttng_trigger_get_const_condition(trigger); |
| 602 | |
| 603 | assert(lttng_condition_get_type(condition) == |
| 604 | LTTNG_CONDITION_TYPE_EVENT_RULE_MATCHES); |
| 605 | |
| 606 | c_status = lttng_condition_event_rule_matches_get_rule( |
| 607 | condition, &rule); |
| 608 | assert(c_status == LTTNG_CONDITION_STATUS_OK); |
| 609 | |
| 610 | switch (lttng_event_rule_get_type(rule)) { |
| 611 | case LTTNG_EVENT_RULE_TYPE_JUL_LOGGING: |
| 612 | case LTTNG_EVENT_RULE_TYPE_LOG4J_LOGGING: |
| 613 | case LTTNG_EVENT_RULE_TYPE_PYTHON_LOGGING: |
| 614 | break; |
| 615 | default: |
| 616 | abort(); |
| 617 | break; |
| 618 | } |
| 619 | |
| 620 | d_type = lttng_event_rule_get_domain_type(rule); |
| 621 | assert(d_type == agt->domain); |
| 622 | |
| 623 | event = lttng_event_rule_generate_lttng_event(rule); |
| 624 | if (!event) { |
| 625 | ret = LTTNG_ERR_NOMEM; |
| 626 | goto end; |
| 627 | } |
| 628 | |
| 629 | /* Get the internal filter expression and bytecode. */ |
| 630 | filter_expression = lttng_event_rule_get_filter(rule); |
| 631 | if (filter_expression) { |
| 632 | filter_expression_copy = strdup(filter_expression); |
| 633 | if (!filter_expression_copy) { |
| 634 | ret = LTTNG_ERR_NOMEM; |
| 635 | goto end; |
| 636 | } |
| 637 | |
| 638 | /* Get the filter bytecode */ |
| 639 | filter_bytecode = lttng_event_rule_get_filter_bytecode(rule); |
| 640 | if (filter_bytecode) { |
| 641 | filter_bytecode_copy = |
| 642 | lttng_bytecode_copy(filter_bytecode); |
| 643 | if (!filter_bytecode_copy) { |
| 644 | ret = LTTNG_ERR_NOMEM; |
| 645 | goto end; |
| 646 | } |
| 647 | } |
| 648 | } |
| 649 | |
| 650 | DBG("Enabling agent event from trigger: trigger name = '%s', trigger owner uid = %d, token = %" PRIu64, |
| 651 | trigger_name, trigger_owner_uid, |
| 652 | lttng_trigger_get_tracer_token(trigger)); |
| 653 | |
| 654 | ret = agent_enable(agt, event, filter_bytecode_copy, |
| 655 | filter_expression_copy); |
| 656 | /* Ownership was passed even in case of error. */ |
| 657 | filter_expression_copy = NULL; |
| 658 | filter_bytecode_copy = NULL; |
| 659 | |
| 660 | end: |
| 661 | free(filter_expression_copy); |
| 662 | free(filter_bytecode_copy); |
| 663 | free(event); |
| 664 | return ret; |
| 665 | } |
| 666 | |
| 667 | /* |
| 668 | * Return the default event name associated with the provided UST domain. Return |
| 669 | * NULL on error. |
| 670 | */ |
| 671 | const char *event_get_default_agent_ust_name(enum lttng_domain_type domain) |
| 672 | { |
| 673 | const char *default_event_name = NULL; |
| 674 | |
| 675 | switch (domain) { |
| 676 | case LTTNG_DOMAIN_LOG4J: |
| 677 | default_event_name = DEFAULT_LOG4J_EVENT_NAME; |
| 678 | break; |
| 679 | case LTTNG_DOMAIN_JUL: |
| 680 | default_event_name = DEFAULT_JUL_EVENT_NAME; |
| 681 | break; |
| 682 | case LTTNG_DOMAIN_PYTHON: |
| 683 | default_event_name = DEFAULT_PYTHON_EVENT_NAME; |
| 684 | break; |
| 685 | default: |
| 686 | assert(0); |
| 687 | } |
| 688 | |
| 689 | return default_event_name; |
| 690 | } |
| 691 | |
| 692 | static int trigger_agent_disable_one(const struct lttng_trigger *trigger, |
| 693 | struct agent *agt, |
| 694 | struct agent_event *aevent) |
| 695 | |
| 696 | { |
| 697 | int ret; |
| 698 | |
| 699 | assert(agt); |
| 700 | assert(trigger); |
| 701 | assert(aevent); |
| 702 | |
| 703 | /* |
| 704 | * Actual ust event un-registration happens on the trigger |
| 705 | * un-registration at that point. |
| 706 | */ |
| 707 | |
| 708 | DBG("Event agent disabling %s (loglevel type %d, loglevel value %d) for trigger %" PRIu64, |
| 709 | aevent->name, aevent->loglevel_type, |
| 710 | aevent->loglevel_value, lttng_trigger_get_tracer_token(trigger)); |
| 711 | |
| 712 | /* Already disabled? */ |
| 713 | if (!AGENT_EVENT_IS_ENABLED(aevent)) { |
| 714 | goto end; |
| 715 | } |
| 716 | |
| 717 | ret = agent_disable_event(aevent, agt->domain); |
| 718 | if (ret != LTTNG_OK) { |
| 719 | goto error; |
| 720 | } |
| 721 | |
| 722 | end: |
| 723 | return LTTNG_OK; |
| 724 | |
| 725 | error: |
| 726 | return ret; |
| 727 | } |
| 728 | |
| 729 | /* |
| 730 | * Disable a given agent event for a given UST session. |
| 731 | * |
| 732 | * Must be called with the RCU read lock held. |
| 733 | * Return LTTNG_OK on success or else a LTTNG_ERR* code. |
| 734 | */ |
| 735 | static int event_agent_disable_one(struct ltt_ust_session *usess, |
| 736 | struct agent *agt, struct agent_event *aevent) |
| 737 | { |
| 738 | int ret; |
| 739 | struct ltt_ust_event *uevent = NULL; |
| 740 | struct ltt_ust_channel *uchan = NULL; |
| 741 | const char *ust_event_name, *ust_channel_name; |
| 742 | |
| 743 | assert(agt); |
| 744 | assert(usess); |
| 745 | assert(aevent); |
| 746 | |
| 747 | DBG("Event agent disabling %s (loglevel type %d, loglevel value %d) for session %" PRIu64, |
| 748 | aevent->name, aevent->loglevel_type, aevent->loglevel_value, |
| 749 | usess->id); |
| 750 | |
| 751 | /* Already disabled? */ |
| 752 | if (!AGENT_EVENT_IS_ENABLED(aevent)) { |
| 753 | goto end; |
| 754 | } |
| 755 | |
| 756 | if (agt->domain == LTTNG_DOMAIN_JUL) { |
| 757 | ust_channel_name = DEFAULT_JUL_CHANNEL_NAME; |
| 758 | } else if (agt->domain == LTTNG_DOMAIN_LOG4J) { |
| 759 | ust_channel_name = DEFAULT_LOG4J_CHANNEL_NAME; |
| 760 | } else if (agt->domain == LTTNG_DOMAIN_PYTHON) { |
| 761 | ust_channel_name = DEFAULT_PYTHON_CHANNEL_NAME; |
| 762 | } else { |
| 763 | ret = LTTNG_ERR_INVALID; |
| 764 | goto error; |
| 765 | } |
| 766 | |
| 767 | /* |
| 768 | * Disable it on the UST side. First get the channel reference then find |
| 769 | * the event and finally disable it. |
| 770 | */ |
| 771 | uchan = trace_ust_find_channel_by_name(usess->domain_global.channels, |
| 772 | (char *) ust_channel_name); |
| 773 | if (!uchan) { |
| 774 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; |
| 775 | goto error; |
| 776 | } |
| 777 | |
| 778 | ust_event_name = event_get_default_agent_ust_name(agt->domain); |
| 779 | if (!ust_event_name) { |
| 780 | ret = LTTNG_ERR_FATAL; |
| 781 | goto error; |
| 782 | } |
| 783 | |
| 784 | /* |
| 785 | * Agent UST event has its loglevel type forced to |
| 786 | * LTTNG_UST_LOGLEVEL_ALL. The actual loglevel type/value filtering |
| 787 | * happens thanks to an UST filter. The following -1 is actually |
| 788 | * ignored since the type is LTTNG_UST_LOGLEVEL_ALL. |
| 789 | */ |
| 790 | uevent = trace_ust_find_event(uchan->events, (char *) ust_event_name, |
| 791 | aevent->filter, LTTNG_UST_ABI_LOGLEVEL_ALL, -1, NULL); |
| 792 | /* If the agent event exists, it must be available on the UST side. */ |
| 793 | assert(uevent); |
| 794 | |
| 795 | if (usess->active) { |
| 796 | ret = ust_app_disable_event_glb(usess, uchan, uevent); |
| 797 | if (ret < 0 && ret != -LTTNG_UST_ERR_EXIST) { |
| 798 | ret = LTTNG_ERR_UST_DISABLE_FAIL; |
| 799 | goto error; |
| 800 | } |
| 801 | } |
| 802 | |
| 803 | /* |
| 804 | * Flag event that it's disabled so the shadow copy on the ust app side |
| 805 | * will disable it if an application shows up. |
| 806 | */ |
| 807 | uevent->enabled = 0; |
| 808 | |
| 809 | ret = agent_disable_event(aevent, agt->domain); |
| 810 | if (ret != LTTNG_OK) { |
| 811 | goto error; |
| 812 | } |
| 813 | |
| 814 | end: |
| 815 | return LTTNG_OK; |
| 816 | |
| 817 | error: |
| 818 | return ret; |
| 819 | } |
| 820 | |
| 821 | /* |
| 822 | * Disable agent event matching a given trigger. |
| 823 | * |
| 824 | * Return LTTNG_OK on success or else a LTTNG_ERR* code. |
| 825 | */ |
| 826 | int trigger_agent_disable( |
| 827 | const struct lttng_trigger *trigger, struct agent *agt) |
| 828 | { |
| 829 | int ret = LTTNG_OK; |
| 830 | struct agent_event *aevent; |
| 831 | |
| 832 | assert(trigger); |
| 833 | assert(agt); |
| 834 | |
| 835 | DBG("Event agent disabling for trigger %" PRIu64, |
| 836 | lttng_trigger_get_tracer_token(trigger)); |
| 837 | |
| 838 | rcu_read_lock(); |
| 839 | aevent = agent_find_event_by_trigger(trigger, agt); |
| 840 | |
| 841 | if (aevent == NULL) { |
| 842 | DBG2("Event agent NOT found by trigger %" PRIu64, |
| 843 | lttng_trigger_get_tracer_token(trigger)); |
| 844 | ret = LTTNG_ERR_UST_EVENT_NOT_FOUND; |
| 845 | goto end; |
| 846 | } |
| 847 | |
| 848 | ret = trigger_agent_disable_one(trigger, agt, aevent); |
| 849 | |
| 850 | if (ret != LTTNG_OK) { |
| 851 | goto end; |
| 852 | } |
| 853 | |
| 854 | end: |
| 855 | rcu_read_unlock(); |
| 856 | return ret; |
| 857 | } |
| 858 | |
| 859 | /* |
| 860 | * Disable all agent events matching a given name for a given UST session. |
| 861 | * |
| 862 | * Return LTTNG_OK on success or else a LTTNG_ERR* code. |
| 863 | */ |
| 864 | int event_agent_disable(struct ltt_ust_session *usess, struct agent *agt, |
| 865 | const char *event_name) |
| 866 | { |
| 867 | int ret = LTTNG_OK; |
| 868 | struct agent_event *aevent; |
| 869 | struct lttng_ht_iter iter; |
| 870 | struct lttng_ht_node_str *node; |
| 871 | |
| 872 | assert(agt); |
| 873 | assert(usess); |
| 874 | assert(event_name); |
| 875 | |
| 876 | DBG("Event agent disabling %s (all loglevels) for session %" PRIu64, event_name, usess->id); |
| 877 | |
| 878 | rcu_read_lock(); |
| 879 | agent_find_events_by_name(event_name, agt, &iter); |
| 880 | node = lttng_ht_iter_get_node_str(&iter); |
| 881 | |
| 882 | if (node == NULL) { |
| 883 | DBG2("Event agent NOT found by name %s", event_name); |
| 884 | ret = LTTNG_ERR_UST_EVENT_NOT_FOUND; |
| 885 | goto end; |
| 886 | } |
| 887 | |
| 888 | do { |
| 889 | aevent = caa_container_of(node, struct agent_event, node); |
| 890 | ret = event_agent_disable_one(usess, agt, aevent); |
| 891 | |
| 892 | if (ret != LTTNG_OK) { |
| 893 | goto end; |
| 894 | } |
| 895 | |
| 896 | /* Get next duplicate agent event by name. */ |
| 897 | agent_event_next_duplicate(event_name, agt, &iter); |
| 898 | node = lttng_ht_iter_get_node_str(&iter); |
| 899 | } while (node); |
| 900 | end: |
| 901 | rcu_read_unlock(); |
| 902 | return ret; |
| 903 | } |
| 904 | /* |
| 905 | * Disable all agent event for a given UST session. |
| 906 | * |
| 907 | * Return LTTNG_OK on success or else a LTTNG_ERR* code. |
| 908 | */ |
| 909 | int event_agent_disable_all(struct ltt_ust_session *usess, |
| 910 | struct agent *agt) |
| 911 | { |
| 912 | int ret; |
| 913 | struct agent_event *aevent; |
| 914 | struct lttng_ht_iter iter; |
| 915 | |
| 916 | assert(agt); |
| 917 | assert(usess); |
| 918 | |
| 919 | /* |
| 920 | * Disable event on agent application. Continue to disable all other events |
| 921 | * if the * event is not found. |
| 922 | */ |
| 923 | ret = event_agent_disable(usess, agt, "*"); |
| 924 | if (ret != LTTNG_OK && ret != LTTNG_ERR_UST_EVENT_NOT_FOUND) { |
| 925 | goto error; |
| 926 | } |
| 927 | |
| 928 | /* Disable every event. */ |
| 929 | rcu_read_lock(); |
| 930 | cds_lfht_for_each_entry(agt->events->ht, &iter.iter, aevent, |
| 931 | node.node) { |
| 932 | if (!AGENT_EVENT_IS_ENABLED(aevent)) { |
| 933 | continue; |
| 934 | } |
| 935 | |
| 936 | ret = event_agent_disable(usess, agt, aevent->name); |
| 937 | if (ret != LTTNG_OK) { |
| 938 | goto error_unlock; |
| 939 | } |
| 940 | } |
| 941 | ret = LTTNG_OK; |
| 942 | |
| 943 | error_unlock: |
| 944 | rcu_read_unlock(); |
| 945 | error: |
| 946 | return ret; |
| 947 | } |