| 1 | /* |
| 2 | * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca> |
| 3 | * Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
| 4 | * 2013 - Jérémie Galarneau <jeremie.galarneau@efficios.com> |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU General Public License, version 2 only, |
| 8 | * as published by the Free Software Foundation. |
| 9 | * |
| 10 | * This program is distributed in the hope that it will be useful, |
| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 | * GNU General Public License for more details. |
| 14 | * |
| 15 | * You should have received a copy of the GNU General Public License along |
| 16 | * with this program; if not, write to the Free Software Foundation, Inc., |
| 17 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. |
| 18 | */ |
| 19 | |
| 20 | #include <stddef.h> |
| 21 | #include <pthread.h> |
| 22 | #include <signal.h> |
| 23 | #include <sys/stat.h> |
| 24 | #include <common/compat/getenv.h> |
| 25 | #include <common/unix.h> |
| 26 | #include <common/utils.h> |
| 27 | #include <lttng/userspace-probe-internal.h> |
| 28 | #include <lttng/event-internal.h> |
| 29 | #include <lttng/session-internal.h> |
| 30 | #include <lttng/session-descriptor-internal.h> |
| 31 | |
| 32 | #include "client.h" |
| 33 | #include "lttng-sessiond.h" |
| 34 | #include "cmd.h" |
| 35 | #include "kernel.h" |
| 36 | #include "save.h" |
| 37 | #include "health-sessiond.h" |
| 38 | #include "testpoint.h" |
| 39 | #include "utils.h" |
| 40 | #include "manage-consumer.h" |
| 41 | |
| 42 | static bool is_root; |
| 43 | |
| 44 | static struct thread_state { |
| 45 | sem_t ready; |
| 46 | bool running; |
| 47 | } thread_state; |
| 48 | |
| 49 | static void set_thread_status(bool running) |
| 50 | { |
| 51 | DBG("Marking client thread's state as %s", running ? "running" : "error"); |
| 52 | thread_state.running = running; |
| 53 | sem_post(&thread_state.ready); |
| 54 | } |
| 55 | |
| 56 | static bool wait_thread_status(void) |
| 57 | { |
| 58 | DBG("Waiting for client thread to be ready"); |
| 59 | sem_wait(&thread_state.ready); |
| 60 | if (thread_state.running) { |
| 61 | DBG("Client thread is ready"); |
| 62 | } else { |
| 63 | ERR("Initialization of client thread failed"); |
| 64 | } |
| 65 | |
| 66 | return thread_state.running; |
| 67 | } |
| 68 | |
| 69 | /* |
| 70 | * Setup the outgoing data buffer for the response (llm) by allocating the |
| 71 | * right amount of memory and copying the original information from the lsm |
| 72 | * structure. |
| 73 | * |
| 74 | * Return 0 on success, negative value on error. |
| 75 | */ |
| 76 | static int setup_lttng_msg(struct command_ctx *cmd_ctx, |
| 77 | const void *payload_buf, size_t payload_len, |
| 78 | const void *cmd_header_buf, size_t cmd_header_len) |
| 79 | { |
| 80 | int ret = 0; |
| 81 | const size_t header_len = sizeof(struct lttcomm_lttng_msg); |
| 82 | const size_t cmd_header_offset = header_len; |
| 83 | const size_t payload_offset = cmd_header_offset + cmd_header_len; |
| 84 | const size_t total_msg_size = header_len + cmd_header_len + payload_len; |
| 85 | |
| 86 | free(cmd_ctx->llm); |
| 87 | cmd_ctx->llm = zmalloc(total_msg_size); |
| 88 | |
| 89 | if (cmd_ctx->llm == NULL) { |
| 90 | PERROR("zmalloc"); |
| 91 | ret = -ENOMEM; |
| 92 | goto end; |
| 93 | } |
| 94 | |
| 95 | /* Copy common data */ |
| 96 | cmd_ctx->llm->cmd_type = cmd_ctx->lsm->cmd_type; |
| 97 | cmd_ctx->llm->pid = cmd_ctx->lsm->domain.attr.pid; |
| 98 | cmd_ctx->llm->cmd_header_size = cmd_header_len; |
| 99 | cmd_ctx->llm->data_size = payload_len; |
| 100 | cmd_ctx->lttng_msg_size = total_msg_size; |
| 101 | |
| 102 | /* Copy command header */ |
| 103 | if (cmd_header_len) { |
| 104 | memcpy(((uint8_t *) cmd_ctx->llm) + cmd_header_offset, cmd_header_buf, |
| 105 | cmd_header_len); |
| 106 | } |
| 107 | |
| 108 | /* Copy payload */ |
| 109 | if (payload_len) { |
| 110 | memcpy(((uint8_t *) cmd_ctx->llm) + payload_offset, payload_buf, |
| 111 | payload_len); |
| 112 | } |
| 113 | |
| 114 | end: |
| 115 | return ret; |
| 116 | } |
| 117 | |
| 118 | /* |
| 119 | * Start the thread_manage_consumer. This must be done after a lttng-consumerd |
| 120 | * exec or it will fail. |
| 121 | */ |
| 122 | static int spawn_consumer_thread(struct consumer_data *consumer_data) |
| 123 | { |
| 124 | return launch_consumer_management_thread(consumer_data) ? 0 : -1; |
| 125 | } |
| 126 | |
| 127 | /* |
| 128 | * Fork and exec a consumer daemon (consumerd). |
| 129 | * |
| 130 | * Return pid if successful else -1. |
| 131 | */ |
| 132 | static pid_t spawn_consumerd(struct consumer_data *consumer_data) |
| 133 | { |
| 134 | int ret; |
| 135 | pid_t pid; |
| 136 | const char *consumer_to_use; |
| 137 | const char *verbosity; |
| 138 | struct stat st; |
| 139 | |
| 140 | DBG("Spawning consumerd"); |
| 141 | |
| 142 | pid = fork(); |
| 143 | if (pid == 0) { |
| 144 | /* |
| 145 | * Exec consumerd. |
| 146 | */ |
| 147 | if (config.verbose_consumer) { |
| 148 | verbosity = "--verbose"; |
| 149 | } else if (lttng_opt_quiet) { |
| 150 | verbosity = "--quiet"; |
| 151 | } else { |
| 152 | verbosity = ""; |
| 153 | } |
| 154 | |
| 155 | switch (consumer_data->type) { |
| 156 | case LTTNG_CONSUMER_KERNEL: |
| 157 | /* |
| 158 | * Find out which consumerd to execute. We will first try the |
| 159 | * 64-bit path, then the sessiond's installation directory, and |
| 160 | * fallback on the 32-bit one, |
| 161 | */ |
| 162 | DBG3("Looking for a kernel consumer at these locations:"); |
| 163 | DBG3(" 1) %s", config.consumerd64_bin_path.value ? : "NULL"); |
| 164 | DBG3(" 2) %s/%s", INSTALL_BIN_PATH, DEFAULT_CONSUMERD_FILE); |
| 165 | DBG3(" 3) %s", config.consumerd32_bin_path.value ? : "NULL"); |
| 166 | if (stat(config.consumerd64_bin_path.value, &st) == 0) { |
| 167 | DBG3("Found location #1"); |
| 168 | consumer_to_use = config.consumerd64_bin_path.value; |
| 169 | } else if (stat(INSTALL_BIN_PATH "/" DEFAULT_CONSUMERD_FILE, &st) == 0) { |
| 170 | DBG3("Found location #2"); |
| 171 | consumer_to_use = INSTALL_BIN_PATH "/" DEFAULT_CONSUMERD_FILE; |
| 172 | } else if (config.consumerd32_bin_path.value && |
| 173 | stat(config.consumerd32_bin_path.value, &st) == 0) { |
| 174 | DBG3("Found location #3"); |
| 175 | consumer_to_use = config.consumerd32_bin_path.value; |
| 176 | } else { |
| 177 | DBG("Could not find any valid consumerd executable"); |
| 178 | ret = -EINVAL; |
| 179 | goto error; |
| 180 | } |
| 181 | DBG("Using kernel consumer at: %s", consumer_to_use); |
| 182 | (void) execl(consumer_to_use, |
| 183 | "lttng-consumerd", verbosity, "-k", |
| 184 | "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path, |
| 185 | "--consumerd-err-sock", consumer_data->err_unix_sock_path, |
| 186 | "--group", config.tracing_group_name.value, |
| 187 | NULL); |
| 188 | break; |
| 189 | case LTTNG_CONSUMER64_UST: |
| 190 | { |
| 191 | if (config.consumerd64_lib_dir.value) { |
| 192 | char *tmp; |
| 193 | size_t tmplen; |
| 194 | char *tmpnew; |
| 195 | |
| 196 | tmp = lttng_secure_getenv("LD_LIBRARY_PATH"); |
| 197 | if (!tmp) { |
| 198 | tmp = ""; |
| 199 | } |
| 200 | tmplen = strlen(config.consumerd64_lib_dir.value) + 1 /* : */ + strlen(tmp); |
| 201 | tmpnew = zmalloc(tmplen + 1 /* \0 */); |
| 202 | if (!tmpnew) { |
| 203 | ret = -ENOMEM; |
| 204 | goto error; |
| 205 | } |
| 206 | strcat(tmpnew, config.consumerd64_lib_dir.value); |
| 207 | if (tmp[0] != '\0') { |
| 208 | strcat(tmpnew, ":"); |
| 209 | strcat(tmpnew, tmp); |
| 210 | } |
| 211 | ret = setenv("LD_LIBRARY_PATH", tmpnew, 1); |
| 212 | free(tmpnew); |
| 213 | if (ret) { |
| 214 | ret = -errno; |
| 215 | goto error; |
| 216 | } |
| 217 | } |
| 218 | DBG("Using 64-bit UST consumer at: %s", config.consumerd64_bin_path.value); |
| 219 | (void) execl(config.consumerd64_bin_path.value, "lttng-consumerd", verbosity, "-u", |
| 220 | "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path, |
| 221 | "--consumerd-err-sock", consumer_data->err_unix_sock_path, |
| 222 | "--group", config.tracing_group_name.value, |
| 223 | NULL); |
| 224 | break; |
| 225 | } |
| 226 | case LTTNG_CONSUMER32_UST: |
| 227 | { |
| 228 | if (config.consumerd32_lib_dir.value) { |
| 229 | char *tmp; |
| 230 | size_t tmplen; |
| 231 | char *tmpnew; |
| 232 | |
| 233 | tmp = lttng_secure_getenv("LD_LIBRARY_PATH"); |
| 234 | if (!tmp) { |
| 235 | tmp = ""; |
| 236 | } |
| 237 | tmplen = strlen(config.consumerd32_lib_dir.value) + 1 /* : */ + strlen(tmp); |
| 238 | tmpnew = zmalloc(tmplen + 1 /* \0 */); |
| 239 | if (!tmpnew) { |
| 240 | ret = -ENOMEM; |
| 241 | goto error; |
| 242 | } |
| 243 | strcat(tmpnew, config.consumerd32_lib_dir.value); |
| 244 | if (tmp[0] != '\0') { |
| 245 | strcat(tmpnew, ":"); |
| 246 | strcat(tmpnew, tmp); |
| 247 | } |
| 248 | ret = setenv("LD_LIBRARY_PATH", tmpnew, 1); |
| 249 | free(tmpnew); |
| 250 | if (ret) { |
| 251 | ret = -errno; |
| 252 | goto error; |
| 253 | } |
| 254 | } |
| 255 | DBG("Using 32-bit UST consumer at: %s", config.consumerd32_bin_path.value); |
| 256 | (void) execl(config.consumerd32_bin_path.value, "lttng-consumerd", verbosity, "-u", |
| 257 | "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path, |
| 258 | "--consumerd-err-sock", consumer_data->err_unix_sock_path, |
| 259 | "--group", config.tracing_group_name.value, |
| 260 | NULL); |
| 261 | break; |
| 262 | } |
| 263 | default: |
| 264 | ERR("unknown consumer type"); |
| 265 | errno = 0; |
| 266 | } |
| 267 | if (errno != 0) { |
| 268 | PERROR("Consumer execl()"); |
| 269 | } |
| 270 | /* Reaching this point, we got a failure on our execl(). */ |
| 271 | exit(EXIT_FAILURE); |
| 272 | } else if (pid > 0) { |
| 273 | ret = pid; |
| 274 | } else { |
| 275 | PERROR("start consumer fork"); |
| 276 | ret = -errno; |
| 277 | } |
| 278 | error: |
| 279 | return ret; |
| 280 | } |
| 281 | |
| 282 | /* |
| 283 | * Spawn the consumerd daemon and session daemon thread. |
| 284 | */ |
| 285 | static int start_consumerd(struct consumer_data *consumer_data) |
| 286 | { |
| 287 | int ret; |
| 288 | |
| 289 | /* |
| 290 | * Set the listen() state on the socket since there is a possible race |
| 291 | * between the exec() of the consumer daemon and this call if place in the |
| 292 | * consumer thread. See bug #366 for more details. |
| 293 | */ |
| 294 | ret = lttcomm_listen_unix_sock(consumer_data->err_sock); |
| 295 | if (ret < 0) { |
| 296 | goto error; |
| 297 | } |
| 298 | |
| 299 | pthread_mutex_lock(&consumer_data->pid_mutex); |
| 300 | if (consumer_data->pid != 0) { |
| 301 | pthread_mutex_unlock(&consumer_data->pid_mutex); |
| 302 | goto end; |
| 303 | } |
| 304 | |
| 305 | ret = spawn_consumerd(consumer_data); |
| 306 | if (ret < 0) { |
| 307 | ERR("Spawning consumerd failed"); |
| 308 | pthread_mutex_unlock(&consumer_data->pid_mutex); |
| 309 | goto error; |
| 310 | } |
| 311 | |
| 312 | /* Setting up the consumer_data pid */ |
| 313 | consumer_data->pid = ret; |
| 314 | DBG2("Consumer pid %d", consumer_data->pid); |
| 315 | pthread_mutex_unlock(&consumer_data->pid_mutex); |
| 316 | |
| 317 | DBG2("Spawning consumer control thread"); |
| 318 | ret = spawn_consumer_thread(consumer_data); |
| 319 | if (ret < 0) { |
| 320 | ERR("Fatal error spawning consumer control thread"); |
| 321 | goto error; |
| 322 | } |
| 323 | |
| 324 | end: |
| 325 | return 0; |
| 326 | |
| 327 | error: |
| 328 | /* Cleanup already created sockets on error. */ |
| 329 | if (consumer_data->err_sock >= 0) { |
| 330 | int err; |
| 331 | |
| 332 | err = close(consumer_data->err_sock); |
| 333 | if (err < 0) { |
| 334 | PERROR("close consumer data error socket"); |
| 335 | } |
| 336 | } |
| 337 | return ret; |
| 338 | } |
| 339 | |
| 340 | /* |
| 341 | * Copy consumer output from the tracing session to the domain session. The |
| 342 | * function also applies the right modification on a per domain basis for the |
| 343 | * trace files destination directory. |
| 344 | * |
| 345 | * Should *NOT* be called with RCU read-side lock held. |
| 346 | */ |
| 347 | static int copy_session_consumer(int domain, struct ltt_session *session) |
| 348 | { |
| 349 | int ret; |
| 350 | const char *dir_name; |
| 351 | struct consumer_output *consumer; |
| 352 | |
| 353 | assert(session); |
| 354 | assert(session->consumer); |
| 355 | |
| 356 | switch (domain) { |
| 357 | case LTTNG_DOMAIN_KERNEL: |
| 358 | DBG3("Copying tracing session consumer output in kernel session"); |
| 359 | /* |
| 360 | * XXX: We should audit the session creation and what this function |
| 361 | * does "extra" in order to avoid a destroy since this function is used |
| 362 | * in the domain session creation (kernel and ust) only. Same for UST |
| 363 | * domain. |
| 364 | */ |
| 365 | if (session->kernel_session->consumer) { |
| 366 | consumer_output_put(session->kernel_session->consumer); |
| 367 | } |
| 368 | session->kernel_session->consumer = |
| 369 | consumer_copy_output(session->consumer); |
| 370 | /* Ease our life a bit for the next part */ |
| 371 | consumer = session->kernel_session->consumer; |
| 372 | dir_name = DEFAULT_KERNEL_TRACE_DIR; |
| 373 | break; |
| 374 | case LTTNG_DOMAIN_JUL: |
| 375 | case LTTNG_DOMAIN_LOG4J: |
| 376 | case LTTNG_DOMAIN_PYTHON: |
| 377 | case LTTNG_DOMAIN_UST: |
| 378 | DBG3("Copying tracing session consumer output in UST session"); |
| 379 | if (session->ust_session->consumer) { |
| 380 | consumer_output_put(session->ust_session->consumer); |
| 381 | } |
| 382 | session->ust_session->consumer = |
| 383 | consumer_copy_output(session->consumer); |
| 384 | /* Ease our life a bit for the next part */ |
| 385 | consumer = session->ust_session->consumer; |
| 386 | dir_name = DEFAULT_UST_TRACE_DIR; |
| 387 | break; |
| 388 | default: |
| 389 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; |
| 390 | goto error; |
| 391 | } |
| 392 | |
| 393 | /* Append correct directory to subdir */ |
| 394 | ret = lttng_strncpy(consumer->domain_subdir, dir_name, |
| 395 | sizeof(consumer->domain_subdir)); |
| 396 | if (ret) { |
| 397 | ret = LTTNG_ERR_UNK; |
| 398 | goto error; |
| 399 | } |
| 400 | DBG3("Copy session consumer subdir %s", consumer->domain_subdir); |
| 401 | ret = LTTNG_OK; |
| 402 | |
| 403 | error: |
| 404 | return ret; |
| 405 | } |
| 406 | |
| 407 | /* |
| 408 | * Create an UST session and add it to the session ust list. |
| 409 | * |
| 410 | * Should *NOT* be called with RCU read-side lock held. |
| 411 | */ |
| 412 | static int create_ust_session(struct ltt_session *session, |
| 413 | const struct lttng_domain *domain) |
| 414 | { |
| 415 | int ret; |
| 416 | struct ltt_ust_session *lus = NULL; |
| 417 | |
| 418 | assert(session); |
| 419 | assert(domain); |
| 420 | assert(session->consumer); |
| 421 | |
| 422 | switch (domain->type) { |
| 423 | case LTTNG_DOMAIN_JUL: |
| 424 | case LTTNG_DOMAIN_LOG4J: |
| 425 | case LTTNG_DOMAIN_PYTHON: |
| 426 | case LTTNG_DOMAIN_UST: |
| 427 | break; |
| 428 | default: |
| 429 | ERR("Unknown UST domain on create session %d", domain->type); |
| 430 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; |
| 431 | goto error; |
| 432 | } |
| 433 | |
| 434 | DBG("Creating UST session"); |
| 435 | |
| 436 | lus = trace_ust_create_session(session->id); |
| 437 | if (lus == NULL) { |
| 438 | ret = LTTNG_ERR_UST_SESS_FAIL; |
| 439 | goto error; |
| 440 | } |
| 441 | |
| 442 | lus->uid = session->uid; |
| 443 | lus->gid = session->gid; |
| 444 | lus->output_traces = session->output_traces; |
| 445 | lus->snapshot_mode = session->snapshot_mode; |
| 446 | lus->live_timer_interval = session->live_timer; |
| 447 | session->ust_session = lus; |
| 448 | if (session->shm_path[0]) { |
| 449 | strncpy(lus->root_shm_path, session->shm_path, |
| 450 | sizeof(lus->root_shm_path)); |
| 451 | lus->root_shm_path[sizeof(lus->root_shm_path) - 1] = '\0'; |
| 452 | strncpy(lus->shm_path, session->shm_path, |
| 453 | sizeof(lus->shm_path)); |
| 454 | lus->shm_path[sizeof(lus->shm_path) - 1] = '\0'; |
| 455 | strncat(lus->shm_path, "/ust", |
| 456 | sizeof(lus->shm_path) - strlen(lus->shm_path) - 1); |
| 457 | } |
| 458 | /* Copy session output to the newly created UST session */ |
| 459 | ret = copy_session_consumer(domain->type, session); |
| 460 | if (ret != LTTNG_OK) { |
| 461 | goto error; |
| 462 | } |
| 463 | |
| 464 | return LTTNG_OK; |
| 465 | |
| 466 | error: |
| 467 | free(lus); |
| 468 | session->ust_session = NULL; |
| 469 | return ret; |
| 470 | } |
| 471 | |
| 472 | /* |
| 473 | * Create a kernel tracer session then create the default channel. |
| 474 | */ |
| 475 | static int create_kernel_session(struct ltt_session *session) |
| 476 | { |
| 477 | int ret; |
| 478 | |
| 479 | DBG("Creating kernel session"); |
| 480 | |
| 481 | ret = kernel_create_session(session); |
| 482 | if (ret < 0) { |
| 483 | ret = LTTNG_ERR_KERN_SESS_FAIL; |
| 484 | goto error_create; |
| 485 | } |
| 486 | |
| 487 | /* Code flow safety */ |
| 488 | assert(session->kernel_session); |
| 489 | |
| 490 | /* Copy session output to the newly created Kernel session */ |
| 491 | ret = copy_session_consumer(LTTNG_DOMAIN_KERNEL, session); |
| 492 | if (ret != LTTNG_OK) { |
| 493 | goto error; |
| 494 | } |
| 495 | |
| 496 | session->kernel_session->uid = session->uid; |
| 497 | session->kernel_session->gid = session->gid; |
| 498 | session->kernel_session->output_traces = session->output_traces; |
| 499 | session->kernel_session->snapshot_mode = session->snapshot_mode; |
| 500 | |
| 501 | return LTTNG_OK; |
| 502 | |
| 503 | error: |
| 504 | trace_kernel_destroy_session(session->kernel_session); |
| 505 | session->kernel_session = NULL; |
| 506 | error_create: |
| 507 | return ret; |
| 508 | } |
| 509 | |
| 510 | /* |
| 511 | * Count number of session permitted by uid/gid. |
| 512 | */ |
| 513 | static unsigned int lttng_sessions_count(uid_t uid, gid_t gid) |
| 514 | { |
| 515 | unsigned int i = 0; |
| 516 | struct ltt_session *session; |
| 517 | const struct ltt_session_list *session_list = session_get_list(); |
| 518 | |
| 519 | DBG("Counting number of available session for UID %d GID %d", |
| 520 | uid, gid); |
| 521 | cds_list_for_each_entry(session, &session_list->head, list) { |
| 522 | if (!session_get(session)) { |
| 523 | continue; |
| 524 | } |
| 525 | session_lock(session); |
| 526 | /* Only count the sessions the user can control. */ |
| 527 | if (session_access_ok(session, uid, gid) && |
| 528 | !session->destroyed) { |
| 529 | i++; |
| 530 | } |
| 531 | session_unlock(session); |
| 532 | session_put(session); |
| 533 | } |
| 534 | return i; |
| 535 | } |
| 536 | |
| 537 | static int receive_userspace_probe(struct command_ctx *cmd_ctx, int sock, |
| 538 | int *sock_error, struct lttng_event *event) |
| 539 | { |
| 540 | int fd, ret; |
| 541 | struct lttng_userspace_probe_location *probe_location; |
| 542 | const struct lttng_userspace_probe_location_lookup_method *lookup = NULL; |
| 543 | struct lttng_dynamic_buffer probe_location_buffer; |
| 544 | struct lttng_buffer_view buffer_view; |
| 545 | |
| 546 | /* |
| 547 | * Create a buffer to store the serialized version of the probe |
| 548 | * location. |
| 549 | */ |
| 550 | lttng_dynamic_buffer_init(&probe_location_buffer); |
| 551 | ret = lttng_dynamic_buffer_set_size(&probe_location_buffer, |
| 552 | cmd_ctx->lsm->u.enable.userspace_probe_location_len); |
| 553 | if (ret) { |
| 554 | ret = LTTNG_ERR_NOMEM; |
| 555 | goto error; |
| 556 | } |
| 557 | |
| 558 | /* |
| 559 | * Receive the probe location. |
| 560 | */ |
| 561 | ret = lttcomm_recv_unix_sock(sock, probe_location_buffer.data, |
| 562 | probe_location_buffer.size); |
| 563 | if (ret <= 0) { |
| 564 | DBG("Nothing recv() from client var len data... continuing"); |
| 565 | *sock_error = 1; |
| 566 | lttng_dynamic_buffer_reset(&probe_location_buffer); |
| 567 | ret = LTTNG_ERR_PROBE_LOCATION_INVAL; |
| 568 | goto error; |
| 569 | } |
| 570 | |
| 571 | buffer_view = lttng_buffer_view_from_dynamic_buffer( |
| 572 | &probe_location_buffer, 0, probe_location_buffer.size); |
| 573 | |
| 574 | /* |
| 575 | * Extract the probe location from the serialized version. |
| 576 | */ |
| 577 | ret = lttng_userspace_probe_location_create_from_buffer( |
| 578 | &buffer_view, &probe_location); |
| 579 | if (ret < 0) { |
| 580 | WARN("Failed to create a userspace probe location from the received buffer"); |
| 581 | lttng_dynamic_buffer_reset( &probe_location_buffer); |
| 582 | ret = LTTNG_ERR_PROBE_LOCATION_INVAL; |
| 583 | goto error; |
| 584 | } |
| 585 | |
| 586 | /* |
| 587 | * Receive the file descriptor to the target binary from the client. |
| 588 | */ |
| 589 | DBG("Receiving userspace probe target FD from client ..."); |
| 590 | ret = lttcomm_recv_fds_unix_sock(sock, &fd, 1); |
| 591 | if (ret <= 0) { |
| 592 | DBG("Nothing recv() from client userspace probe fd... continuing"); |
| 593 | *sock_error = 1; |
| 594 | ret = LTTNG_ERR_PROBE_LOCATION_INVAL; |
| 595 | goto error; |
| 596 | } |
| 597 | |
| 598 | /* |
| 599 | * Set the file descriptor received from the client through the unix |
| 600 | * socket in the probe location. |
| 601 | */ |
| 602 | lookup = lttng_userspace_probe_location_get_lookup_method(probe_location); |
| 603 | if (!lookup) { |
| 604 | ret = LTTNG_ERR_PROBE_LOCATION_INVAL; |
| 605 | goto error; |
| 606 | } |
| 607 | |
| 608 | /* |
| 609 | * From the kernel tracer's perspective, all userspace probe event types |
| 610 | * are all the same: a file and an offset. |
| 611 | */ |
| 612 | switch (lttng_userspace_probe_location_lookup_method_get_type(lookup)) { |
| 613 | case LTTNG_USERSPACE_PROBE_LOCATION_LOOKUP_METHOD_TYPE_FUNCTION_ELF: |
| 614 | ret = lttng_userspace_probe_location_function_set_binary_fd( |
| 615 | probe_location, fd); |
| 616 | break; |
| 617 | case LTTNG_USERSPACE_PROBE_LOCATION_LOOKUP_METHOD_TYPE_TRACEPOINT_SDT: |
| 618 | ret = lttng_userspace_probe_location_tracepoint_set_binary_fd( |
| 619 | probe_location, fd); |
| 620 | break; |
| 621 | default: |
| 622 | ret = LTTNG_ERR_PROBE_LOCATION_INVAL; |
| 623 | goto error; |
| 624 | } |
| 625 | |
| 626 | if (ret) { |
| 627 | ret = LTTNG_ERR_PROBE_LOCATION_INVAL; |
| 628 | goto error; |
| 629 | } |
| 630 | |
| 631 | /* Attach the probe location to the event. */ |
| 632 | ret = lttng_event_set_userspace_probe_location(event, probe_location); |
| 633 | if (ret) { |
| 634 | ret = LTTNG_ERR_PROBE_LOCATION_INVAL; |
| 635 | goto error; |
| 636 | } |
| 637 | |
| 638 | lttng_dynamic_buffer_reset(&probe_location_buffer); |
| 639 | error: |
| 640 | return ret; |
| 641 | } |
| 642 | |
| 643 | /* |
| 644 | * Version of setup_lttng_msg() without command header. |
| 645 | */ |
| 646 | static int setup_lttng_msg_no_cmd_header(struct command_ctx *cmd_ctx, |
| 647 | void *payload_buf, size_t payload_len) |
| 648 | { |
| 649 | return setup_lttng_msg(cmd_ctx, payload_buf, payload_len, NULL, 0); |
| 650 | } |
| 651 | |
| 652 | /* |
| 653 | * Free memory of a command context structure. |
| 654 | */ |
| 655 | static void clean_command_ctx(struct command_ctx **cmd_ctx) |
| 656 | { |
| 657 | DBG("Clean command context structure"); |
| 658 | if (*cmd_ctx) { |
| 659 | if ((*cmd_ctx)->llm) { |
| 660 | free((*cmd_ctx)->llm); |
| 661 | } |
| 662 | if ((*cmd_ctx)->lsm) { |
| 663 | free((*cmd_ctx)->lsm); |
| 664 | } |
| 665 | free(*cmd_ctx); |
| 666 | *cmd_ctx = NULL; |
| 667 | } |
| 668 | } |
| 669 | |
| 670 | /* |
| 671 | * Check if the current kernel tracer supports the session rotation feature. |
| 672 | * Return 1 if it does, 0 otherwise. |
| 673 | */ |
| 674 | static int check_rotate_compatible(void) |
| 675 | { |
| 676 | int ret = 1; |
| 677 | |
| 678 | if (kernel_tracer_version.major != 2 || kernel_tracer_version.minor < 11) { |
| 679 | DBG("Kernel tracer version is not compatible with the rotation feature"); |
| 680 | ret = 0; |
| 681 | } |
| 682 | |
| 683 | return ret; |
| 684 | } |
| 685 | |
| 686 | /* |
| 687 | * Send data on a unix socket using the liblttsessiondcomm API. |
| 688 | * |
| 689 | * Return lttcomm error code. |
| 690 | */ |
| 691 | static int send_unix_sock(int sock, void *buf, size_t len) |
| 692 | { |
| 693 | /* Check valid length */ |
| 694 | if (len == 0) { |
| 695 | return -1; |
| 696 | } |
| 697 | |
| 698 | return lttcomm_send_unix_sock(sock, buf, len); |
| 699 | } |
| 700 | |
| 701 | /* |
| 702 | * Process the command requested by the lttng client within the command |
| 703 | * context structure. This function make sure that the return structure (llm) |
| 704 | * is set and ready for transmission before returning. |
| 705 | * |
| 706 | * Return any error encountered or 0 for success. |
| 707 | * |
| 708 | * "sock" is only used for special-case var. len data. |
| 709 | * A command may assume the ownership of the socket, in which case its value |
| 710 | * should be set to -1. |
| 711 | * |
| 712 | * Should *NOT* be called with RCU read-side lock held. |
| 713 | */ |
| 714 | static int process_client_msg(struct command_ctx *cmd_ctx, int *sock, |
| 715 | int *sock_error) |
| 716 | { |
| 717 | int ret = LTTNG_OK; |
| 718 | int need_tracing_session = 1; |
| 719 | int need_domain; |
| 720 | |
| 721 | DBG("Processing client command %d", cmd_ctx->lsm->cmd_type); |
| 722 | |
| 723 | assert(!rcu_read_ongoing()); |
| 724 | |
| 725 | *sock_error = 0; |
| 726 | |
| 727 | switch (cmd_ctx->lsm->cmd_type) { |
| 728 | case LTTNG_CREATE_SESSION_EXT: |
| 729 | case LTTNG_DESTROY_SESSION: |
| 730 | case LTTNG_LIST_SESSIONS: |
| 731 | case LTTNG_LIST_DOMAINS: |
| 732 | case LTTNG_START_TRACE: |
| 733 | case LTTNG_STOP_TRACE: |
| 734 | case LTTNG_DATA_PENDING: |
| 735 | case LTTNG_SNAPSHOT_ADD_OUTPUT: |
| 736 | case LTTNG_SNAPSHOT_DEL_OUTPUT: |
| 737 | case LTTNG_SNAPSHOT_LIST_OUTPUT: |
| 738 | case LTTNG_SNAPSHOT_RECORD: |
| 739 | case LTTNG_SAVE_SESSION: |
| 740 | case LTTNG_SET_SESSION_SHM_PATH: |
| 741 | case LTTNG_REGENERATE_METADATA: |
| 742 | case LTTNG_REGENERATE_STATEDUMP: |
| 743 | case LTTNG_REGISTER_TRIGGER: |
| 744 | case LTTNG_UNREGISTER_TRIGGER: |
| 745 | case LTTNG_ROTATE_SESSION: |
| 746 | case LTTNG_ROTATION_GET_INFO: |
| 747 | case LTTNG_ROTATION_SET_SCHEDULE: |
| 748 | case LTTNG_SESSION_LIST_ROTATION_SCHEDULES: |
| 749 | need_domain = 0; |
| 750 | break; |
| 751 | default: |
| 752 | need_domain = 1; |
| 753 | } |
| 754 | |
| 755 | if (config.no_kernel && need_domain |
| 756 | && cmd_ctx->lsm->domain.type == LTTNG_DOMAIN_KERNEL) { |
| 757 | if (!is_root) { |
| 758 | ret = LTTNG_ERR_NEED_ROOT_SESSIOND; |
| 759 | } else { |
| 760 | ret = LTTNG_ERR_KERN_NA; |
| 761 | } |
| 762 | goto error; |
| 763 | } |
| 764 | |
| 765 | /* Deny register consumer if we already have a spawned consumer. */ |
| 766 | if (cmd_ctx->lsm->cmd_type == LTTNG_REGISTER_CONSUMER) { |
| 767 | pthread_mutex_lock(&kconsumer_data.pid_mutex); |
| 768 | if (kconsumer_data.pid > 0) { |
| 769 | ret = LTTNG_ERR_KERN_CONSUMER_FAIL; |
| 770 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); |
| 771 | goto error; |
| 772 | } |
| 773 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); |
| 774 | } |
| 775 | |
| 776 | /* |
| 777 | * Check for command that don't needs to allocate a returned payload. We do |
| 778 | * this here so we don't have to make the call for no payload at each |
| 779 | * command. |
| 780 | */ |
| 781 | switch(cmd_ctx->lsm->cmd_type) { |
| 782 | case LTTNG_LIST_SESSIONS: |
| 783 | case LTTNG_LIST_TRACEPOINTS: |
| 784 | case LTTNG_LIST_TRACEPOINT_FIELDS: |
| 785 | case LTTNG_LIST_DOMAINS: |
| 786 | case LTTNG_LIST_CHANNELS: |
| 787 | case LTTNG_LIST_EVENTS: |
| 788 | case LTTNG_LIST_SYSCALLS: |
| 789 | case LTTNG_LIST_TRACKER_PIDS: |
| 790 | case LTTNG_DATA_PENDING: |
| 791 | case LTTNG_ROTATE_SESSION: |
| 792 | case LTTNG_ROTATION_GET_INFO: |
| 793 | case LTTNG_SESSION_LIST_ROTATION_SCHEDULES: |
| 794 | break; |
| 795 | default: |
| 796 | /* Setup lttng message with no payload */ |
| 797 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, NULL, 0); |
| 798 | if (ret < 0) { |
| 799 | /* This label does not try to unlock the session */ |
| 800 | goto init_setup_error; |
| 801 | } |
| 802 | } |
| 803 | |
| 804 | /* Commands that DO NOT need a session. */ |
| 805 | switch (cmd_ctx->lsm->cmd_type) { |
| 806 | case LTTNG_CREATE_SESSION_EXT: |
| 807 | case LTTNG_LIST_SESSIONS: |
| 808 | case LTTNG_LIST_TRACEPOINTS: |
| 809 | case LTTNG_LIST_SYSCALLS: |
| 810 | case LTTNG_LIST_TRACEPOINT_FIELDS: |
| 811 | case LTTNG_SAVE_SESSION: |
| 812 | case LTTNG_REGISTER_TRIGGER: |
| 813 | case LTTNG_UNREGISTER_TRIGGER: |
| 814 | need_tracing_session = 0; |
| 815 | break; |
| 816 | default: |
| 817 | DBG("Getting session %s by name", cmd_ctx->lsm->session.name); |
| 818 | /* |
| 819 | * We keep the session list lock across _all_ commands |
| 820 | * for now, because the per-session lock does not |
| 821 | * handle teardown properly. |
| 822 | */ |
| 823 | session_lock_list(); |
| 824 | cmd_ctx->session = session_find_by_name(cmd_ctx->lsm->session.name); |
| 825 | if (cmd_ctx->session == NULL) { |
| 826 | ret = LTTNG_ERR_SESS_NOT_FOUND; |
| 827 | goto error; |
| 828 | } else { |
| 829 | /* Acquire lock for the session */ |
| 830 | session_lock(cmd_ctx->session); |
| 831 | } |
| 832 | break; |
| 833 | } |
| 834 | |
| 835 | /* |
| 836 | * Commands that need a valid session but should NOT create one if none |
| 837 | * exists. Instead of creating one and destroying it when the command is |
| 838 | * handled, process that right before so we save some round trip in useless |
| 839 | * code path. |
| 840 | */ |
| 841 | switch (cmd_ctx->lsm->cmd_type) { |
| 842 | case LTTNG_DISABLE_CHANNEL: |
| 843 | case LTTNG_DISABLE_EVENT: |
| 844 | switch (cmd_ctx->lsm->domain.type) { |
| 845 | case LTTNG_DOMAIN_KERNEL: |
| 846 | if (!cmd_ctx->session->kernel_session) { |
| 847 | ret = LTTNG_ERR_NO_CHANNEL; |
| 848 | goto error; |
| 849 | } |
| 850 | break; |
| 851 | case LTTNG_DOMAIN_JUL: |
| 852 | case LTTNG_DOMAIN_LOG4J: |
| 853 | case LTTNG_DOMAIN_PYTHON: |
| 854 | case LTTNG_DOMAIN_UST: |
| 855 | if (!cmd_ctx->session->ust_session) { |
| 856 | ret = LTTNG_ERR_NO_CHANNEL; |
| 857 | goto error; |
| 858 | } |
| 859 | break; |
| 860 | default: |
| 861 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; |
| 862 | goto error; |
| 863 | } |
| 864 | default: |
| 865 | break; |
| 866 | } |
| 867 | |
| 868 | if (!need_domain) { |
| 869 | goto skip_domain; |
| 870 | } |
| 871 | |
| 872 | /* |
| 873 | * Check domain type for specific "pre-action". |
| 874 | */ |
| 875 | switch (cmd_ctx->lsm->domain.type) { |
| 876 | case LTTNG_DOMAIN_KERNEL: |
| 877 | if (!is_root) { |
| 878 | ret = LTTNG_ERR_NEED_ROOT_SESSIOND; |
| 879 | goto error; |
| 880 | } |
| 881 | |
| 882 | /* Kernel tracer check */ |
| 883 | if (!kernel_tracer_is_initialized()) { |
| 884 | /* Basically, load kernel tracer modules */ |
| 885 | ret = init_kernel_tracer(); |
| 886 | if (ret != 0) { |
| 887 | goto error; |
| 888 | } |
| 889 | } |
| 890 | |
| 891 | /* Consumer is in an ERROR state. Report back to client */ |
| 892 | if (uatomic_read(&kernel_consumerd_state) == CONSUMER_ERROR) { |
| 893 | ret = LTTNG_ERR_NO_KERNCONSUMERD; |
| 894 | goto error; |
| 895 | } |
| 896 | |
| 897 | /* Need a session for kernel command */ |
| 898 | if (need_tracing_session) { |
| 899 | if (cmd_ctx->session->kernel_session == NULL) { |
| 900 | ret = create_kernel_session(cmd_ctx->session); |
| 901 | if (ret != LTTNG_OK) { |
| 902 | ret = LTTNG_ERR_KERN_SESS_FAIL; |
| 903 | goto error; |
| 904 | } |
| 905 | } |
| 906 | |
| 907 | /* Start the kernel consumer daemon */ |
| 908 | pthread_mutex_lock(&kconsumer_data.pid_mutex); |
| 909 | if (kconsumer_data.pid == 0 && |
| 910 | cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) { |
| 911 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); |
| 912 | ret = start_consumerd(&kconsumer_data); |
| 913 | if (ret < 0) { |
| 914 | ret = LTTNG_ERR_KERN_CONSUMER_FAIL; |
| 915 | goto error; |
| 916 | } |
| 917 | uatomic_set(&kernel_consumerd_state, CONSUMER_STARTED); |
| 918 | } else { |
| 919 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); |
| 920 | } |
| 921 | |
| 922 | /* |
| 923 | * The consumer was just spawned so we need to add the socket to |
| 924 | * the consumer output of the session if exist. |
| 925 | */ |
| 926 | ret = consumer_create_socket(&kconsumer_data, |
| 927 | cmd_ctx->session->kernel_session->consumer); |
| 928 | if (ret < 0) { |
| 929 | goto error; |
| 930 | } |
| 931 | } |
| 932 | |
| 933 | break; |
| 934 | case LTTNG_DOMAIN_JUL: |
| 935 | case LTTNG_DOMAIN_LOG4J: |
| 936 | case LTTNG_DOMAIN_PYTHON: |
| 937 | case LTTNG_DOMAIN_UST: |
| 938 | { |
| 939 | if (!ust_app_supported()) { |
| 940 | ret = LTTNG_ERR_NO_UST; |
| 941 | goto error; |
| 942 | } |
| 943 | /* Consumer is in an ERROR state. Report back to client */ |
| 944 | if (uatomic_read(&ust_consumerd_state) == CONSUMER_ERROR) { |
| 945 | ret = LTTNG_ERR_NO_USTCONSUMERD; |
| 946 | goto error; |
| 947 | } |
| 948 | |
| 949 | if (need_tracing_session) { |
| 950 | /* Create UST session if none exist. */ |
| 951 | if (cmd_ctx->session->ust_session == NULL) { |
| 952 | ret = create_ust_session(cmd_ctx->session, |
| 953 | ALIGNED_CONST_PTR(cmd_ctx->lsm->domain)); |
| 954 | if (ret != LTTNG_OK) { |
| 955 | goto error; |
| 956 | } |
| 957 | } |
| 958 | |
| 959 | /* Start the UST consumer daemons */ |
| 960 | /* 64-bit */ |
| 961 | pthread_mutex_lock(&ustconsumer64_data.pid_mutex); |
| 962 | if (config.consumerd64_bin_path.value && |
| 963 | ustconsumer64_data.pid == 0 && |
| 964 | cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) { |
| 965 | pthread_mutex_unlock(&ustconsumer64_data.pid_mutex); |
| 966 | ret = start_consumerd(&ustconsumer64_data); |
| 967 | if (ret < 0) { |
| 968 | ret = LTTNG_ERR_UST_CONSUMER64_FAIL; |
| 969 | uatomic_set(&ust_consumerd64_fd, -EINVAL); |
| 970 | goto error; |
| 971 | } |
| 972 | |
| 973 | uatomic_set(&ust_consumerd64_fd, ustconsumer64_data.cmd_sock); |
| 974 | uatomic_set(&ust_consumerd_state, CONSUMER_STARTED); |
| 975 | } else { |
| 976 | pthread_mutex_unlock(&ustconsumer64_data.pid_mutex); |
| 977 | } |
| 978 | |
| 979 | /* |
| 980 | * Setup socket for consumer 64 bit. No need for atomic access |
| 981 | * since it was set above and can ONLY be set in this thread. |
| 982 | */ |
| 983 | ret = consumer_create_socket(&ustconsumer64_data, |
| 984 | cmd_ctx->session->ust_session->consumer); |
| 985 | if (ret < 0) { |
| 986 | goto error; |
| 987 | } |
| 988 | |
| 989 | /* 32-bit */ |
| 990 | pthread_mutex_lock(&ustconsumer32_data.pid_mutex); |
| 991 | if (config.consumerd32_bin_path.value && |
| 992 | ustconsumer32_data.pid == 0 && |
| 993 | cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) { |
| 994 | pthread_mutex_unlock(&ustconsumer32_data.pid_mutex); |
| 995 | ret = start_consumerd(&ustconsumer32_data); |
| 996 | if (ret < 0) { |
| 997 | ret = LTTNG_ERR_UST_CONSUMER32_FAIL; |
| 998 | uatomic_set(&ust_consumerd32_fd, -EINVAL); |
| 999 | goto error; |
| 1000 | } |
| 1001 | |
| 1002 | uatomic_set(&ust_consumerd32_fd, ustconsumer32_data.cmd_sock); |
| 1003 | uatomic_set(&ust_consumerd_state, CONSUMER_STARTED); |
| 1004 | } else { |
| 1005 | pthread_mutex_unlock(&ustconsumer32_data.pid_mutex); |
| 1006 | } |
| 1007 | |
| 1008 | /* |
| 1009 | * Setup socket for consumer 32 bit. No need for atomic access |
| 1010 | * since it was set above and can ONLY be set in this thread. |
| 1011 | */ |
| 1012 | ret = consumer_create_socket(&ustconsumer32_data, |
| 1013 | cmd_ctx->session->ust_session->consumer); |
| 1014 | if (ret < 0) { |
| 1015 | goto error; |
| 1016 | } |
| 1017 | } |
| 1018 | break; |
| 1019 | } |
| 1020 | default: |
| 1021 | break; |
| 1022 | } |
| 1023 | skip_domain: |
| 1024 | |
| 1025 | /* Validate consumer daemon state when start/stop trace command */ |
| 1026 | if (cmd_ctx->lsm->cmd_type == LTTNG_START_TRACE || |
| 1027 | cmd_ctx->lsm->cmd_type == LTTNG_STOP_TRACE) { |
| 1028 | switch (cmd_ctx->lsm->domain.type) { |
| 1029 | case LTTNG_DOMAIN_NONE: |
| 1030 | break; |
| 1031 | case LTTNG_DOMAIN_JUL: |
| 1032 | case LTTNG_DOMAIN_LOG4J: |
| 1033 | case LTTNG_DOMAIN_PYTHON: |
| 1034 | case LTTNG_DOMAIN_UST: |
| 1035 | if (uatomic_read(&ust_consumerd_state) != CONSUMER_STARTED) { |
| 1036 | ret = LTTNG_ERR_NO_USTCONSUMERD; |
| 1037 | goto error; |
| 1038 | } |
| 1039 | break; |
| 1040 | case LTTNG_DOMAIN_KERNEL: |
| 1041 | if (uatomic_read(&kernel_consumerd_state) != CONSUMER_STARTED) { |
| 1042 | ret = LTTNG_ERR_NO_KERNCONSUMERD; |
| 1043 | goto error; |
| 1044 | } |
| 1045 | break; |
| 1046 | default: |
| 1047 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; |
| 1048 | goto error; |
| 1049 | } |
| 1050 | } |
| 1051 | |
| 1052 | /* |
| 1053 | * Check that the UID or GID match that of the tracing session. |
| 1054 | * The root user can interact with all sessions. |
| 1055 | */ |
| 1056 | if (need_tracing_session) { |
| 1057 | if (!session_access_ok(cmd_ctx->session, |
| 1058 | LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds), |
| 1059 | LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds)) || |
| 1060 | cmd_ctx->session->destroyed) { |
| 1061 | ret = LTTNG_ERR_EPERM; |
| 1062 | goto error; |
| 1063 | } |
| 1064 | } |
| 1065 | |
| 1066 | /* |
| 1067 | * Send relayd information to consumer as soon as we have a domain and a |
| 1068 | * session defined. |
| 1069 | */ |
| 1070 | if (cmd_ctx->session && need_domain) { |
| 1071 | /* |
| 1072 | * Setup relayd if not done yet. If the relayd information was already |
| 1073 | * sent to the consumer, this call will gracefully return. |
| 1074 | */ |
| 1075 | ret = cmd_setup_relayd(cmd_ctx->session); |
| 1076 | if (ret != LTTNG_OK) { |
| 1077 | goto error; |
| 1078 | } |
| 1079 | } |
| 1080 | |
| 1081 | /* Process by command type */ |
| 1082 | switch (cmd_ctx->lsm->cmd_type) { |
| 1083 | case LTTNG_ADD_CONTEXT: |
| 1084 | { |
| 1085 | /* |
| 1086 | * An LTTNG_ADD_CONTEXT command might have a supplementary |
| 1087 | * payload if the context being added is an application context. |
| 1088 | */ |
| 1089 | if (cmd_ctx->lsm->u.context.ctx.ctx == |
| 1090 | LTTNG_EVENT_CONTEXT_APP_CONTEXT) { |
| 1091 | char *provider_name = NULL, *context_name = NULL; |
| 1092 | size_t provider_name_len = |
| 1093 | cmd_ctx->lsm->u.context.provider_name_len; |
| 1094 | size_t context_name_len = |
| 1095 | cmd_ctx->lsm->u.context.context_name_len; |
| 1096 | |
| 1097 | if (provider_name_len == 0 || context_name_len == 0) { |
| 1098 | /* |
| 1099 | * Application provider and context names MUST |
| 1100 | * be provided. |
| 1101 | */ |
| 1102 | ret = -LTTNG_ERR_INVALID; |
| 1103 | goto error; |
| 1104 | } |
| 1105 | |
| 1106 | provider_name = zmalloc(provider_name_len + 1); |
| 1107 | if (!provider_name) { |
| 1108 | ret = -LTTNG_ERR_NOMEM; |
| 1109 | goto error; |
| 1110 | } |
| 1111 | cmd_ctx->lsm->u.context.ctx.u.app_ctx.provider_name = |
| 1112 | provider_name; |
| 1113 | |
| 1114 | context_name = zmalloc(context_name_len + 1); |
| 1115 | if (!context_name) { |
| 1116 | ret = -LTTNG_ERR_NOMEM; |
| 1117 | goto error_add_context; |
| 1118 | } |
| 1119 | cmd_ctx->lsm->u.context.ctx.u.app_ctx.ctx_name = |
| 1120 | context_name; |
| 1121 | |
| 1122 | ret = lttcomm_recv_unix_sock(*sock, provider_name, |
| 1123 | provider_name_len); |
| 1124 | if (ret < 0) { |
| 1125 | goto error_add_context; |
| 1126 | } |
| 1127 | |
| 1128 | ret = lttcomm_recv_unix_sock(*sock, context_name, |
| 1129 | context_name_len); |
| 1130 | if (ret < 0) { |
| 1131 | goto error_add_context; |
| 1132 | } |
| 1133 | } |
| 1134 | |
| 1135 | /* |
| 1136 | * cmd_add_context assumes ownership of the provider and context |
| 1137 | * names. |
| 1138 | */ |
| 1139 | ret = cmd_add_context(cmd_ctx->session, |
| 1140 | cmd_ctx->lsm->domain.type, |
| 1141 | cmd_ctx->lsm->u.context.channel_name, |
| 1142 | ALIGNED_CONST_PTR(cmd_ctx->lsm->u.context.ctx), |
| 1143 | kernel_poll_pipe[1]); |
| 1144 | |
| 1145 | cmd_ctx->lsm->u.context.ctx.u.app_ctx.provider_name = NULL; |
| 1146 | cmd_ctx->lsm->u.context.ctx.u.app_ctx.ctx_name = NULL; |
| 1147 | error_add_context: |
| 1148 | free(cmd_ctx->lsm->u.context.ctx.u.app_ctx.provider_name); |
| 1149 | free(cmd_ctx->lsm->u.context.ctx.u.app_ctx.ctx_name); |
| 1150 | if (ret < 0) { |
| 1151 | goto error; |
| 1152 | } |
| 1153 | break; |
| 1154 | } |
| 1155 | case LTTNG_DISABLE_CHANNEL: |
| 1156 | { |
| 1157 | ret = cmd_disable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type, |
| 1158 | cmd_ctx->lsm->u.disable.channel_name); |
| 1159 | break; |
| 1160 | } |
| 1161 | case LTTNG_DISABLE_EVENT: |
| 1162 | { |
| 1163 | |
| 1164 | /* |
| 1165 | * FIXME: handle filter; for now we just receive the filter's |
| 1166 | * bytecode along with the filter expression which are sent by |
| 1167 | * liblttng-ctl and discard them. |
| 1168 | * |
| 1169 | * This fixes an issue where the client may block while sending |
| 1170 | * the filter payload and encounter an error because the session |
| 1171 | * daemon closes the socket without ever handling this data. |
| 1172 | */ |
| 1173 | size_t count = cmd_ctx->lsm->u.disable.expression_len + |
| 1174 | cmd_ctx->lsm->u.disable.bytecode_len; |
| 1175 | |
| 1176 | if (count) { |
| 1177 | char data[LTTNG_FILTER_MAX_LEN]; |
| 1178 | |
| 1179 | DBG("Discarding disable event command payload of size %zu", count); |
| 1180 | while (count) { |
| 1181 | ret = lttcomm_recv_unix_sock(*sock, data, |
| 1182 | count > sizeof(data) ? sizeof(data) : count); |
| 1183 | if (ret < 0) { |
| 1184 | goto error; |
| 1185 | } |
| 1186 | |
| 1187 | count -= (size_t) ret; |
| 1188 | } |
| 1189 | } |
| 1190 | ret = cmd_disable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type, |
| 1191 | cmd_ctx->lsm->u.disable.channel_name, |
| 1192 | ALIGNED_CONST_PTR(cmd_ctx->lsm->u.disable.event)); |
| 1193 | break; |
| 1194 | } |
| 1195 | case LTTNG_ENABLE_CHANNEL: |
| 1196 | { |
| 1197 | cmd_ctx->lsm->u.channel.chan.attr.extended.ptr = |
| 1198 | (struct lttng_channel_extended *) &cmd_ctx->lsm->u.channel.extended; |
| 1199 | ret = cmd_enable_channel(cmd_ctx->session, |
| 1200 | ALIGNED_CONST_PTR(cmd_ctx->lsm->domain), |
| 1201 | ALIGNED_CONST_PTR(cmd_ctx->lsm->u.channel.chan), |
| 1202 | kernel_poll_pipe[1]); |
| 1203 | break; |
| 1204 | } |
| 1205 | case LTTNG_TRACK_PID: |
| 1206 | { |
| 1207 | ret = cmd_track_pid(cmd_ctx->session, |
| 1208 | cmd_ctx->lsm->domain.type, |
| 1209 | cmd_ctx->lsm->u.pid_tracker.pid); |
| 1210 | break; |
| 1211 | } |
| 1212 | case LTTNG_UNTRACK_PID: |
| 1213 | { |
| 1214 | ret = cmd_untrack_pid(cmd_ctx->session, |
| 1215 | cmd_ctx->lsm->domain.type, |
| 1216 | cmd_ctx->lsm->u.pid_tracker.pid); |
| 1217 | break; |
| 1218 | } |
| 1219 | case LTTNG_ENABLE_EVENT: |
| 1220 | { |
| 1221 | struct lttng_event *ev = NULL; |
| 1222 | struct lttng_event_exclusion *exclusion = NULL; |
| 1223 | struct lttng_filter_bytecode *bytecode = NULL; |
| 1224 | char *filter_expression = NULL; |
| 1225 | |
| 1226 | /* Handle exclusion events and receive it from the client. */ |
| 1227 | if (cmd_ctx->lsm->u.enable.exclusion_count > 0) { |
| 1228 | size_t count = cmd_ctx->lsm->u.enable.exclusion_count; |
| 1229 | |
| 1230 | exclusion = zmalloc(sizeof(struct lttng_event_exclusion) + |
| 1231 | (count * LTTNG_SYMBOL_NAME_LEN)); |
| 1232 | if (!exclusion) { |
| 1233 | ret = LTTNG_ERR_EXCLUSION_NOMEM; |
| 1234 | goto error; |
| 1235 | } |
| 1236 | |
| 1237 | DBG("Receiving var len exclusion event list from client ..."); |
| 1238 | exclusion->count = count; |
| 1239 | ret = lttcomm_recv_unix_sock(*sock, exclusion->names, |
| 1240 | count * LTTNG_SYMBOL_NAME_LEN); |
| 1241 | if (ret <= 0) { |
| 1242 | DBG("Nothing recv() from client var len data... continuing"); |
| 1243 | *sock_error = 1; |
| 1244 | free(exclusion); |
| 1245 | ret = LTTNG_ERR_EXCLUSION_INVAL; |
| 1246 | goto error; |
| 1247 | } |
| 1248 | } |
| 1249 | |
| 1250 | /* Get filter expression from client. */ |
| 1251 | if (cmd_ctx->lsm->u.enable.expression_len > 0) { |
| 1252 | size_t expression_len = |
| 1253 | cmd_ctx->lsm->u.enable.expression_len; |
| 1254 | |
| 1255 | if (expression_len > LTTNG_FILTER_MAX_LEN) { |
| 1256 | ret = LTTNG_ERR_FILTER_INVAL; |
| 1257 | free(exclusion); |
| 1258 | goto error; |
| 1259 | } |
| 1260 | |
| 1261 | filter_expression = zmalloc(expression_len); |
| 1262 | if (!filter_expression) { |
| 1263 | free(exclusion); |
| 1264 | ret = LTTNG_ERR_FILTER_NOMEM; |
| 1265 | goto error; |
| 1266 | } |
| 1267 | |
| 1268 | /* Receive var. len. data */ |
| 1269 | DBG("Receiving var len filter's expression from client ..."); |
| 1270 | ret = lttcomm_recv_unix_sock(*sock, filter_expression, |
| 1271 | expression_len); |
| 1272 | if (ret <= 0) { |
| 1273 | DBG("Nothing recv() from client var len data... continuing"); |
| 1274 | *sock_error = 1; |
| 1275 | free(filter_expression); |
| 1276 | free(exclusion); |
| 1277 | ret = LTTNG_ERR_FILTER_INVAL; |
| 1278 | goto error; |
| 1279 | } |
| 1280 | } |
| 1281 | |
| 1282 | /* Handle filter and get bytecode from client. */ |
| 1283 | if (cmd_ctx->lsm->u.enable.bytecode_len > 0) { |
| 1284 | size_t bytecode_len = cmd_ctx->lsm->u.enable.bytecode_len; |
| 1285 | |
| 1286 | if (bytecode_len > LTTNG_FILTER_MAX_LEN) { |
| 1287 | ret = LTTNG_ERR_FILTER_INVAL; |
| 1288 | free(filter_expression); |
| 1289 | free(exclusion); |
| 1290 | goto error; |
| 1291 | } |
| 1292 | |
| 1293 | bytecode = zmalloc(bytecode_len); |
| 1294 | if (!bytecode) { |
| 1295 | free(filter_expression); |
| 1296 | free(exclusion); |
| 1297 | ret = LTTNG_ERR_FILTER_NOMEM; |
| 1298 | goto error; |
| 1299 | } |
| 1300 | |
| 1301 | /* Receive var. len. data */ |
| 1302 | DBG("Receiving var len filter's bytecode from client ..."); |
| 1303 | ret = lttcomm_recv_unix_sock(*sock, bytecode, bytecode_len); |
| 1304 | if (ret <= 0) { |
| 1305 | DBG("Nothing recv() from client var len data... continuing"); |
| 1306 | *sock_error = 1; |
| 1307 | free(filter_expression); |
| 1308 | free(bytecode); |
| 1309 | free(exclusion); |
| 1310 | ret = LTTNG_ERR_FILTER_INVAL; |
| 1311 | goto error; |
| 1312 | } |
| 1313 | |
| 1314 | if ((bytecode->len + sizeof(*bytecode)) != bytecode_len) { |
| 1315 | free(filter_expression); |
| 1316 | free(bytecode); |
| 1317 | free(exclusion); |
| 1318 | ret = LTTNG_ERR_FILTER_INVAL; |
| 1319 | goto error; |
| 1320 | } |
| 1321 | } |
| 1322 | |
| 1323 | ev = lttng_event_copy(ALIGNED_CONST_PTR(cmd_ctx->lsm->u.enable.event)); |
| 1324 | if (!ev) { |
| 1325 | DBG("Failed to copy event: %s", |
| 1326 | cmd_ctx->lsm->u.enable.event.name); |
| 1327 | free(filter_expression); |
| 1328 | free(bytecode); |
| 1329 | free(exclusion); |
| 1330 | ret = LTTNG_ERR_NOMEM; |
| 1331 | goto error; |
| 1332 | } |
| 1333 | |
| 1334 | |
| 1335 | if (cmd_ctx->lsm->u.enable.userspace_probe_location_len > 0) { |
| 1336 | /* Expect a userspace probe description. */ |
| 1337 | ret = receive_userspace_probe(cmd_ctx, *sock, sock_error, ev); |
| 1338 | if (ret) { |
| 1339 | free(filter_expression); |
| 1340 | free(bytecode); |
| 1341 | free(exclusion); |
| 1342 | lttng_event_destroy(ev); |
| 1343 | goto error; |
| 1344 | } |
| 1345 | } |
| 1346 | |
| 1347 | ret = cmd_enable_event(cmd_ctx->session, |
| 1348 | ALIGNED_CONST_PTR(cmd_ctx->lsm->domain), |
| 1349 | cmd_ctx->lsm->u.enable.channel_name, |
| 1350 | ev, |
| 1351 | filter_expression, bytecode, exclusion, |
| 1352 | kernel_poll_pipe[1]); |
| 1353 | lttng_event_destroy(ev); |
| 1354 | break; |
| 1355 | } |
| 1356 | case LTTNG_LIST_TRACEPOINTS: |
| 1357 | { |
| 1358 | struct lttng_event *events; |
| 1359 | ssize_t nb_events; |
| 1360 | |
| 1361 | session_lock_list(); |
| 1362 | nb_events = cmd_list_tracepoints(cmd_ctx->lsm->domain.type, &events); |
| 1363 | session_unlock_list(); |
| 1364 | if (nb_events < 0) { |
| 1365 | /* Return value is a negative lttng_error_code. */ |
| 1366 | ret = -nb_events; |
| 1367 | goto error; |
| 1368 | } |
| 1369 | |
| 1370 | /* |
| 1371 | * Setup lttng message with payload size set to the event list size in |
| 1372 | * bytes and then copy list into the llm payload. |
| 1373 | */ |
| 1374 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, events, |
| 1375 | sizeof(struct lttng_event) * nb_events); |
| 1376 | free(events); |
| 1377 | |
| 1378 | if (ret < 0) { |
| 1379 | goto setup_error; |
| 1380 | } |
| 1381 | |
| 1382 | ret = LTTNG_OK; |
| 1383 | break; |
| 1384 | } |
| 1385 | case LTTNG_LIST_TRACEPOINT_FIELDS: |
| 1386 | { |
| 1387 | struct lttng_event_field *fields; |
| 1388 | ssize_t nb_fields; |
| 1389 | |
| 1390 | session_lock_list(); |
| 1391 | nb_fields = cmd_list_tracepoint_fields(cmd_ctx->lsm->domain.type, |
| 1392 | &fields); |
| 1393 | session_unlock_list(); |
| 1394 | if (nb_fields < 0) { |
| 1395 | /* Return value is a negative lttng_error_code. */ |
| 1396 | ret = -nb_fields; |
| 1397 | goto error; |
| 1398 | } |
| 1399 | |
| 1400 | /* |
| 1401 | * Setup lttng message with payload size set to the event list size in |
| 1402 | * bytes and then copy list into the llm payload. |
| 1403 | */ |
| 1404 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, fields, |
| 1405 | sizeof(struct lttng_event_field) * nb_fields); |
| 1406 | free(fields); |
| 1407 | |
| 1408 | if (ret < 0) { |
| 1409 | goto setup_error; |
| 1410 | } |
| 1411 | |
| 1412 | ret = LTTNG_OK; |
| 1413 | break; |
| 1414 | } |
| 1415 | case LTTNG_LIST_SYSCALLS: |
| 1416 | { |
| 1417 | struct lttng_event *events; |
| 1418 | ssize_t nb_events; |
| 1419 | |
| 1420 | nb_events = cmd_list_syscalls(&events); |
| 1421 | if (nb_events < 0) { |
| 1422 | /* Return value is a negative lttng_error_code. */ |
| 1423 | ret = -nb_events; |
| 1424 | goto error; |
| 1425 | } |
| 1426 | |
| 1427 | /* |
| 1428 | * Setup lttng message with payload size set to the event list size in |
| 1429 | * bytes and then copy list into the llm payload. |
| 1430 | */ |
| 1431 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, events, |
| 1432 | sizeof(struct lttng_event) * nb_events); |
| 1433 | free(events); |
| 1434 | |
| 1435 | if (ret < 0) { |
| 1436 | goto setup_error; |
| 1437 | } |
| 1438 | |
| 1439 | ret = LTTNG_OK; |
| 1440 | break; |
| 1441 | } |
| 1442 | case LTTNG_LIST_TRACKER_PIDS: |
| 1443 | { |
| 1444 | int32_t *pids = NULL; |
| 1445 | ssize_t nr_pids; |
| 1446 | |
| 1447 | nr_pids = cmd_list_tracker_pids(cmd_ctx->session, |
| 1448 | cmd_ctx->lsm->domain.type, &pids); |
| 1449 | if (nr_pids < 0) { |
| 1450 | /* Return value is a negative lttng_error_code. */ |
| 1451 | ret = -nr_pids; |
| 1452 | goto error; |
| 1453 | } |
| 1454 | |
| 1455 | /* |
| 1456 | * Setup lttng message with payload size set to the event list size in |
| 1457 | * bytes and then copy list into the llm payload. |
| 1458 | */ |
| 1459 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, pids, |
| 1460 | sizeof(int32_t) * nr_pids); |
| 1461 | free(pids); |
| 1462 | |
| 1463 | if (ret < 0) { |
| 1464 | goto setup_error; |
| 1465 | } |
| 1466 | |
| 1467 | ret = LTTNG_OK; |
| 1468 | break; |
| 1469 | } |
| 1470 | case LTTNG_SET_CONSUMER_URI: |
| 1471 | { |
| 1472 | size_t nb_uri, len; |
| 1473 | struct lttng_uri *uris; |
| 1474 | |
| 1475 | nb_uri = cmd_ctx->lsm->u.uri.size; |
| 1476 | len = nb_uri * sizeof(struct lttng_uri); |
| 1477 | |
| 1478 | if (nb_uri == 0) { |
| 1479 | ret = LTTNG_ERR_INVALID; |
| 1480 | goto error; |
| 1481 | } |
| 1482 | |
| 1483 | uris = zmalloc(len); |
| 1484 | if (uris == NULL) { |
| 1485 | ret = LTTNG_ERR_FATAL; |
| 1486 | goto error; |
| 1487 | } |
| 1488 | |
| 1489 | /* Receive variable len data */ |
| 1490 | DBG("Receiving %zu URI(s) from client ...", nb_uri); |
| 1491 | ret = lttcomm_recv_unix_sock(*sock, uris, len); |
| 1492 | if (ret <= 0) { |
| 1493 | DBG("No URIs received from client... continuing"); |
| 1494 | *sock_error = 1; |
| 1495 | ret = LTTNG_ERR_SESSION_FAIL; |
| 1496 | free(uris); |
| 1497 | goto error; |
| 1498 | } |
| 1499 | |
| 1500 | ret = cmd_set_consumer_uri(cmd_ctx->session, nb_uri, uris); |
| 1501 | free(uris); |
| 1502 | if (ret != LTTNG_OK) { |
| 1503 | goto error; |
| 1504 | } |
| 1505 | |
| 1506 | |
| 1507 | break; |
| 1508 | } |
| 1509 | case LTTNG_START_TRACE: |
| 1510 | { |
| 1511 | /* |
| 1512 | * On the first start, if we have a kernel session and we have |
| 1513 | * enabled time or size-based rotations, we have to make sure |
| 1514 | * the kernel tracer supports it. |
| 1515 | */ |
| 1516 | if (!cmd_ctx->session->has_been_started && \ |
| 1517 | cmd_ctx->session->kernel_session && \ |
| 1518 | (cmd_ctx->session->rotate_timer_period || \ |
| 1519 | cmd_ctx->session->rotate_size) && \ |
| 1520 | !check_rotate_compatible()) { |
| 1521 | DBG("Kernel tracer version is not compatible with the rotation feature"); |
| 1522 | ret = LTTNG_ERR_ROTATION_WRONG_VERSION; |
| 1523 | goto error; |
| 1524 | } |
| 1525 | ret = cmd_start_trace(cmd_ctx->session); |
| 1526 | break; |
| 1527 | } |
| 1528 | case LTTNG_STOP_TRACE: |
| 1529 | { |
| 1530 | ret = cmd_stop_trace(cmd_ctx->session); |
| 1531 | break; |
| 1532 | } |
| 1533 | case LTTNG_DESTROY_SESSION: |
| 1534 | { |
| 1535 | ret = cmd_destroy_session(cmd_ctx->session, |
| 1536 | notification_thread_handle, |
| 1537 | sock); |
| 1538 | break; |
| 1539 | } |
| 1540 | case LTTNG_LIST_DOMAINS: |
| 1541 | { |
| 1542 | ssize_t nb_dom; |
| 1543 | struct lttng_domain *domains = NULL; |
| 1544 | |
| 1545 | nb_dom = cmd_list_domains(cmd_ctx->session, &domains); |
| 1546 | if (nb_dom < 0) { |
| 1547 | /* Return value is a negative lttng_error_code. */ |
| 1548 | ret = -nb_dom; |
| 1549 | goto error; |
| 1550 | } |
| 1551 | |
| 1552 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, domains, |
| 1553 | nb_dom * sizeof(struct lttng_domain)); |
| 1554 | free(domains); |
| 1555 | |
| 1556 | if (ret < 0) { |
| 1557 | goto setup_error; |
| 1558 | } |
| 1559 | |
| 1560 | ret = LTTNG_OK; |
| 1561 | break; |
| 1562 | } |
| 1563 | case LTTNG_LIST_CHANNELS: |
| 1564 | { |
| 1565 | ssize_t payload_size; |
| 1566 | struct lttng_channel *channels = NULL; |
| 1567 | |
| 1568 | payload_size = cmd_list_channels(cmd_ctx->lsm->domain.type, |
| 1569 | cmd_ctx->session, &channels); |
| 1570 | if (payload_size < 0) { |
| 1571 | /* Return value is a negative lttng_error_code. */ |
| 1572 | ret = -payload_size; |
| 1573 | goto error; |
| 1574 | } |
| 1575 | |
| 1576 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, channels, |
| 1577 | payload_size); |
| 1578 | free(channels); |
| 1579 | |
| 1580 | if (ret < 0) { |
| 1581 | goto setup_error; |
| 1582 | } |
| 1583 | |
| 1584 | ret = LTTNG_OK; |
| 1585 | break; |
| 1586 | } |
| 1587 | case LTTNG_LIST_EVENTS: |
| 1588 | { |
| 1589 | ssize_t nb_event; |
| 1590 | struct lttng_event *events = NULL; |
| 1591 | struct lttcomm_event_command_header cmd_header; |
| 1592 | size_t total_size; |
| 1593 | |
| 1594 | memset(&cmd_header, 0, sizeof(cmd_header)); |
| 1595 | /* Extended infos are included at the end of events */ |
| 1596 | nb_event = cmd_list_events(cmd_ctx->lsm->domain.type, |
| 1597 | cmd_ctx->session, cmd_ctx->lsm->u.list.channel_name, |
| 1598 | &events, &total_size); |
| 1599 | |
| 1600 | if (nb_event < 0) { |
| 1601 | /* Return value is a negative lttng_error_code. */ |
| 1602 | ret = -nb_event; |
| 1603 | goto error; |
| 1604 | } |
| 1605 | |
| 1606 | cmd_header.nb_events = nb_event; |
| 1607 | ret = setup_lttng_msg(cmd_ctx, events, total_size, |
| 1608 | &cmd_header, sizeof(cmd_header)); |
| 1609 | free(events); |
| 1610 | |
| 1611 | if (ret < 0) { |
| 1612 | goto setup_error; |
| 1613 | } |
| 1614 | |
| 1615 | ret = LTTNG_OK; |
| 1616 | break; |
| 1617 | } |
| 1618 | case LTTNG_LIST_SESSIONS: |
| 1619 | { |
| 1620 | unsigned int nr_sessions; |
| 1621 | void *sessions_payload; |
| 1622 | size_t payload_len; |
| 1623 | |
| 1624 | session_lock_list(); |
| 1625 | nr_sessions = lttng_sessions_count( |
| 1626 | LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds), |
| 1627 | LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds)); |
| 1628 | |
| 1629 | payload_len = (sizeof(struct lttng_session) * nr_sessions) + |
| 1630 | (sizeof(struct lttng_session_extended) * nr_sessions); |
| 1631 | sessions_payload = zmalloc(payload_len); |
| 1632 | |
| 1633 | if (!sessions_payload) { |
| 1634 | session_unlock_list(); |
| 1635 | ret = -ENOMEM; |
| 1636 | goto setup_error; |
| 1637 | } |
| 1638 | |
| 1639 | cmd_list_lttng_sessions(sessions_payload, nr_sessions, |
| 1640 | LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds), |
| 1641 | LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds)); |
| 1642 | session_unlock_list(); |
| 1643 | |
| 1644 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, sessions_payload, |
| 1645 | payload_len); |
| 1646 | free(sessions_payload); |
| 1647 | |
| 1648 | if (ret < 0) { |
| 1649 | goto setup_error; |
| 1650 | } |
| 1651 | |
| 1652 | ret = LTTNG_OK; |
| 1653 | break; |
| 1654 | } |
| 1655 | case LTTNG_REGISTER_CONSUMER: |
| 1656 | { |
| 1657 | struct consumer_data *cdata; |
| 1658 | |
| 1659 | switch (cmd_ctx->lsm->domain.type) { |
| 1660 | case LTTNG_DOMAIN_KERNEL: |
| 1661 | cdata = &kconsumer_data; |
| 1662 | break; |
| 1663 | default: |
| 1664 | ret = LTTNG_ERR_UND; |
| 1665 | goto error; |
| 1666 | } |
| 1667 | |
| 1668 | ret = cmd_register_consumer(cmd_ctx->session, cmd_ctx->lsm->domain.type, |
| 1669 | cmd_ctx->lsm->u.reg.path, cdata); |
| 1670 | break; |
| 1671 | } |
| 1672 | case LTTNG_DATA_PENDING: |
| 1673 | { |
| 1674 | int pending_ret; |
| 1675 | uint8_t pending_ret_byte; |
| 1676 | |
| 1677 | pending_ret = cmd_data_pending(cmd_ctx->session); |
| 1678 | |
| 1679 | /* |
| 1680 | * FIXME |
| 1681 | * |
| 1682 | * This function may returns 0 or 1 to indicate whether or not |
| 1683 | * there is data pending. In case of error, it should return an |
| 1684 | * LTTNG_ERR code. However, some code paths may still return |
| 1685 | * a nondescript error code, which we handle by returning an |
| 1686 | * "unknown" error. |
| 1687 | */ |
| 1688 | if (pending_ret == 0 || pending_ret == 1) { |
| 1689 | /* |
| 1690 | * ret will be set to LTTNG_OK at the end of |
| 1691 | * this function. |
| 1692 | */ |
| 1693 | } else if (pending_ret < 0) { |
| 1694 | ret = LTTNG_ERR_UNK; |
| 1695 | goto setup_error; |
| 1696 | } else { |
| 1697 | ret = pending_ret; |
| 1698 | goto setup_error; |
| 1699 | } |
| 1700 | |
| 1701 | pending_ret_byte = (uint8_t) pending_ret; |
| 1702 | |
| 1703 | /* 1 byte to return whether or not data is pending */ |
| 1704 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, |
| 1705 | &pending_ret_byte, 1); |
| 1706 | |
| 1707 | if (ret < 0) { |
| 1708 | goto setup_error; |
| 1709 | } |
| 1710 | |
| 1711 | ret = LTTNG_OK; |
| 1712 | break; |
| 1713 | } |
| 1714 | case LTTNG_SNAPSHOT_ADD_OUTPUT: |
| 1715 | { |
| 1716 | uint32_t snapshot_id; |
| 1717 | struct lttcomm_lttng_output_id reply; |
| 1718 | |
| 1719 | ret = cmd_snapshot_add_output(cmd_ctx->session, |
| 1720 | ALIGNED_CONST_PTR(cmd_ctx->lsm->u.snapshot_output.output), |
| 1721 | &snapshot_id); |
| 1722 | if (ret != LTTNG_OK) { |
| 1723 | goto error; |
| 1724 | } |
| 1725 | reply.id = snapshot_id; |
| 1726 | |
| 1727 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, &reply, |
| 1728 | sizeof(reply)); |
| 1729 | if (ret < 0) { |
| 1730 | goto setup_error; |
| 1731 | } |
| 1732 | |
| 1733 | /* Copy output list into message payload */ |
| 1734 | ret = LTTNG_OK; |
| 1735 | break; |
| 1736 | } |
| 1737 | case LTTNG_SNAPSHOT_DEL_OUTPUT: |
| 1738 | { |
| 1739 | ret = cmd_snapshot_del_output(cmd_ctx->session, |
| 1740 | ALIGNED_CONST_PTR(cmd_ctx->lsm->u.snapshot_output.output)); |
| 1741 | break; |
| 1742 | } |
| 1743 | case LTTNG_SNAPSHOT_LIST_OUTPUT: |
| 1744 | { |
| 1745 | ssize_t nb_output; |
| 1746 | struct lttng_snapshot_output *outputs = NULL; |
| 1747 | |
| 1748 | nb_output = cmd_snapshot_list_outputs(cmd_ctx->session, &outputs); |
| 1749 | if (nb_output < 0) { |
| 1750 | ret = -nb_output; |
| 1751 | goto error; |
| 1752 | } |
| 1753 | |
| 1754 | assert((nb_output > 0 && outputs) || nb_output == 0); |
| 1755 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, outputs, |
| 1756 | nb_output * sizeof(struct lttng_snapshot_output)); |
| 1757 | free(outputs); |
| 1758 | |
| 1759 | if (ret < 0) { |
| 1760 | goto setup_error; |
| 1761 | } |
| 1762 | |
| 1763 | ret = LTTNG_OK; |
| 1764 | break; |
| 1765 | } |
| 1766 | case LTTNG_SNAPSHOT_RECORD: |
| 1767 | { |
| 1768 | ret = cmd_snapshot_record(cmd_ctx->session, |
| 1769 | ALIGNED_CONST_PTR(cmd_ctx->lsm->u.snapshot_record.output), |
| 1770 | cmd_ctx->lsm->u.snapshot_record.wait); |
| 1771 | break; |
| 1772 | } |
| 1773 | case LTTNG_CREATE_SESSION_EXT: |
| 1774 | { |
| 1775 | struct lttng_dynamic_buffer payload; |
| 1776 | struct lttng_session_descriptor *return_descriptor = NULL; |
| 1777 | |
| 1778 | lttng_dynamic_buffer_init(&payload); |
| 1779 | ret = cmd_create_session(cmd_ctx, *sock, &return_descriptor); |
| 1780 | if (ret != LTTNG_OK) { |
| 1781 | goto error; |
| 1782 | } |
| 1783 | |
| 1784 | ret = lttng_session_descriptor_serialize(return_descriptor, |
| 1785 | &payload); |
| 1786 | if (ret) { |
| 1787 | ERR("Failed to serialize session descriptor in reply to \"create session\" command"); |
| 1788 | lttng_session_descriptor_destroy(return_descriptor); |
| 1789 | ret = LTTNG_ERR_NOMEM; |
| 1790 | goto error; |
| 1791 | } |
| 1792 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, payload.data, |
| 1793 | payload.size); |
| 1794 | if (ret) { |
| 1795 | lttng_session_descriptor_destroy(return_descriptor); |
| 1796 | ret = LTTNG_ERR_NOMEM; |
| 1797 | goto error; |
| 1798 | } |
| 1799 | lttng_dynamic_buffer_reset(&payload); |
| 1800 | lttng_session_descriptor_destroy(return_descriptor); |
| 1801 | ret = LTTNG_OK; |
| 1802 | break; |
| 1803 | } |
| 1804 | case LTTNG_SAVE_SESSION: |
| 1805 | { |
| 1806 | ret = cmd_save_sessions(&cmd_ctx->lsm->u.save_session.attr, |
| 1807 | &cmd_ctx->creds); |
| 1808 | break; |
| 1809 | } |
| 1810 | case LTTNG_SET_SESSION_SHM_PATH: |
| 1811 | { |
| 1812 | ret = cmd_set_session_shm_path(cmd_ctx->session, |
| 1813 | cmd_ctx->lsm->u.set_shm_path.shm_path); |
| 1814 | break; |
| 1815 | } |
| 1816 | case LTTNG_REGENERATE_METADATA: |
| 1817 | { |
| 1818 | ret = cmd_regenerate_metadata(cmd_ctx->session); |
| 1819 | break; |
| 1820 | } |
| 1821 | case LTTNG_REGENERATE_STATEDUMP: |
| 1822 | { |
| 1823 | ret = cmd_regenerate_statedump(cmd_ctx->session); |
| 1824 | break; |
| 1825 | } |
| 1826 | case LTTNG_REGISTER_TRIGGER: |
| 1827 | { |
| 1828 | ret = cmd_register_trigger(cmd_ctx, *sock, |
| 1829 | notification_thread_handle); |
| 1830 | break; |
| 1831 | } |
| 1832 | case LTTNG_UNREGISTER_TRIGGER: |
| 1833 | { |
| 1834 | ret = cmd_unregister_trigger(cmd_ctx, *sock, |
| 1835 | notification_thread_handle); |
| 1836 | break; |
| 1837 | } |
| 1838 | case LTTNG_ROTATE_SESSION: |
| 1839 | { |
| 1840 | struct lttng_rotate_session_return rotate_return; |
| 1841 | |
| 1842 | DBG("Client rotate session \"%s\"", cmd_ctx->session->name); |
| 1843 | |
| 1844 | memset(&rotate_return, 0, sizeof(rotate_return)); |
| 1845 | if (cmd_ctx->session->kernel_session && !check_rotate_compatible()) { |
| 1846 | DBG("Kernel tracer version is not compatible with the rotation feature"); |
| 1847 | ret = LTTNG_ERR_ROTATION_WRONG_VERSION; |
| 1848 | goto error; |
| 1849 | } |
| 1850 | |
| 1851 | ret = cmd_rotate_session(cmd_ctx->session, &rotate_return, |
| 1852 | false); |
| 1853 | if (ret < 0) { |
| 1854 | ret = -ret; |
| 1855 | goto error; |
| 1856 | } |
| 1857 | |
| 1858 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, &rotate_return, |
| 1859 | sizeof(rotate_return)); |
| 1860 | if (ret < 0) { |
| 1861 | ret = -ret; |
| 1862 | goto error; |
| 1863 | } |
| 1864 | |
| 1865 | ret = LTTNG_OK; |
| 1866 | break; |
| 1867 | } |
| 1868 | case LTTNG_ROTATION_GET_INFO: |
| 1869 | { |
| 1870 | struct lttng_rotation_get_info_return get_info_return; |
| 1871 | |
| 1872 | memset(&get_info_return, 0, sizeof(get_info_return)); |
| 1873 | ret = cmd_rotate_get_info(cmd_ctx->session, &get_info_return, |
| 1874 | cmd_ctx->lsm->u.get_rotation_info.rotation_id); |
| 1875 | if (ret < 0) { |
| 1876 | ret = -ret; |
| 1877 | goto error; |
| 1878 | } |
| 1879 | |
| 1880 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, &get_info_return, |
| 1881 | sizeof(get_info_return)); |
| 1882 | if (ret < 0) { |
| 1883 | ret = -ret; |
| 1884 | goto error; |
| 1885 | } |
| 1886 | |
| 1887 | ret = LTTNG_OK; |
| 1888 | break; |
| 1889 | } |
| 1890 | case LTTNG_ROTATION_SET_SCHEDULE: |
| 1891 | { |
| 1892 | bool set_schedule; |
| 1893 | enum lttng_rotation_schedule_type schedule_type; |
| 1894 | uint64_t value; |
| 1895 | |
| 1896 | if (cmd_ctx->session->kernel_session && !check_rotate_compatible()) { |
| 1897 | DBG("Kernel tracer version does not support session rotations"); |
| 1898 | ret = LTTNG_ERR_ROTATION_WRONG_VERSION; |
| 1899 | goto error; |
| 1900 | } |
| 1901 | |
| 1902 | set_schedule = cmd_ctx->lsm->u.rotation_set_schedule.set == 1; |
| 1903 | schedule_type = (enum lttng_rotation_schedule_type) cmd_ctx->lsm->u.rotation_set_schedule.type; |
| 1904 | value = cmd_ctx->lsm->u.rotation_set_schedule.value; |
| 1905 | |
| 1906 | ret = cmd_rotation_set_schedule(cmd_ctx->session, |
| 1907 | set_schedule, |
| 1908 | schedule_type, |
| 1909 | value, |
| 1910 | notification_thread_handle); |
| 1911 | if (ret != LTTNG_OK) { |
| 1912 | goto error; |
| 1913 | } |
| 1914 | |
| 1915 | break; |
| 1916 | } |
| 1917 | case LTTNG_SESSION_LIST_ROTATION_SCHEDULES: |
| 1918 | { |
| 1919 | struct lttng_session_list_schedules_return schedules = { |
| 1920 | .periodic.set = !!cmd_ctx->session->rotate_timer_period, |
| 1921 | .periodic.value = cmd_ctx->session->rotate_timer_period, |
| 1922 | .size.set = !!cmd_ctx->session->rotate_size, |
| 1923 | .size.value = cmd_ctx->session->rotate_size, |
| 1924 | }; |
| 1925 | |
| 1926 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, &schedules, |
| 1927 | sizeof(schedules)); |
| 1928 | if (ret < 0) { |
| 1929 | ret = -ret; |
| 1930 | goto error; |
| 1931 | } |
| 1932 | |
| 1933 | ret = LTTNG_OK; |
| 1934 | break; |
| 1935 | } |
| 1936 | default: |
| 1937 | ret = LTTNG_ERR_UND; |
| 1938 | break; |
| 1939 | } |
| 1940 | |
| 1941 | error: |
| 1942 | if (cmd_ctx->llm == NULL) { |
| 1943 | DBG("Missing llm structure. Allocating one."); |
| 1944 | if (setup_lttng_msg_no_cmd_header(cmd_ctx, NULL, 0) < 0) { |
| 1945 | goto setup_error; |
| 1946 | } |
| 1947 | } |
| 1948 | /* Set return code */ |
| 1949 | cmd_ctx->llm->ret_code = ret; |
| 1950 | setup_error: |
| 1951 | if (cmd_ctx->session) { |
| 1952 | session_unlock(cmd_ctx->session); |
| 1953 | session_put(cmd_ctx->session); |
| 1954 | cmd_ctx->session = NULL; |
| 1955 | } |
| 1956 | if (need_tracing_session) { |
| 1957 | session_unlock_list(); |
| 1958 | } |
| 1959 | init_setup_error: |
| 1960 | assert(!rcu_read_ongoing()); |
| 1961 | return ret; |
| 1962 | } |
| 1963 | |
| 1964 | static int create_client_sock(void) |
| 1965 | { |
| 1966 | int ret, client_sock; |
| 1967 | const mode_t old_umask = umask(0); |
| 1968 | |
| 1969 | /* Create client tool unix socket */ |
| 1970 | client_sock = lttcomm_create_unix_sock(config.client_unix_sock_path.value); |
| 1971 | if (client_sock < 0) { |
| 1972 | ERR("Create unix sock failed: %s", config.client_unix_sock_path.value); |
| 1973 | ret = -1; |
| 1974 | goto end; |
| 1975 | } |
| 1976 | |
| 1977 | /* Set the cloexec flag */ |
| 1978 | ret = utils_set_fd_cloexec(client_sock); |
| 1979 | if (ret < 0) { |
| 1980 | ERR("Unable to set CLOEXEC flag to the client Unix socket (fd: %d). " |
| 1981 | "Continuing but note that the consumer daemon will have a " |
| 1982 | "reference to this socket on exec()", client_sock); |
| 1983 | } |
| 1984 | |
| 1985 | /* File permission MUST be 660 */ |
| 1986 | ret = chmod(config.client_unix_sock_path.value, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); |
| 1987 | if (ret < 0) { |
| 1988 | ERR("Set file permissions failed: %s", |
| 1989 | config.client_unix_sock_path.value); |
| 1990 | PERROR("chmod"); |
| 1991 | (void) lttcomm_close_unix_sock(client_sock); |
| 1992 | ret = -1; |
| 1993 | goto end; |
| 1994 | } |
| 1995 | DBG("Created client socket (fd = %i)", client_sock); |
| 1996 | ret = client_sock; |
| 1997 | end: |
| 1998 | umask(old_umask); |
| 1999 | return ret; |
| 2000 | } |
| 2001 | |
| 2002 | static void cleanup_client_thread(void *data) |
| 2003 | { |
| 2004 | struct lttng_pipe *quit_pipe = data; |
| 2005 | |
| 2006 | lttng_pipe_destroy(quit_pipe); |
| 2007 | } |
| 2008 | |
| 2009 | static void thread_init_cleanup(void *data) |
| 2010 | { |
| 2011 | set_thread_status(false); |
| 2012 | } |
| 2013 | |
| 2014 | /* |
| 2015 | * This thread manage all clients request using the unix client socket for |
| 2016 | * communication. |
| 2017 | */ |
| 2018 | static void *thread_manage_clients(void *data) |
| 2019 | { |
| 2020 | int sock = -1, ret, i, pollfd, err = -1; |
| 2021 | int sock_error; |
| 2022 | uint32_t revents, nb_fd; |
| 2023 | struct command_ctx *cmd_ctx = NULL; |
| 2024 | struct lttng_poll_event events; |
| 2025 | int client_sock = -1; |
| 2026 | struct lttng_pipe *quit_pipe = data; |
| 2027 | const int thread_quit_pipe_fd = lttng_pipe_get_readfd(quit_pipe); |
| 2028 | |
| 2029 | DBG("[thread] Manage client started"); |
| 2030 | |
| 2031 | is_root = (getuid() == 0); |
| 2032 | |
| 2033 | pthread_cleanup_push(thread_init_cleanup, NULL); |
| 2034 | client_sock = create_client_sock(); |
| 2035 | if (client_sock < 0) { |
| 2036 | goto error_listen; |
| 2037 | } |
| 2038 | |
| 2039 | rcu_register_thread(); |
| 2040 | |
| 2041 | health_register(health_sessiond, HEALTH_SESSIOND_TYPE_CMD); |
| 2042 | |
| 2043 | health_code_update(); |
| 2044 | |
| 2045 | ret = lttcomm_listen_unix_sock(client_sock); |
| 2046 | if (ret < 0) { |
| 2047 | goto error_listen; |
| 2048 | } |
| 2049 | |
| 2050 | /* |
| 2051 | * Pass 2 as size here for the thread quit pipe and client_sock. Nothing |
| 2052 | * more will be added to this poll set. |
| 2053 | */ |
| 2054 | ret = lttng_poll_create(&events, 2, LTTNG_CLOEXEC); |
| 2055 | if (ret < 0) { |
| 2056 | goto error_create_poll; |
| 2057 | } |
| 2058 | |
| 2059 | /* Add the application registration socket */ |
| 2060 | ret = lttng_poll_add(&events, client_sock, LPOLLIN | LPOLLPRI); |
| 2061 | if (ret < 0) { |
| 2062 | goto error; |
| 2063 | } |
| 2064 | |
| 2065 | /* Add thread quit pipe */ |
| 2066 | ret = lttng_poll_add(&events, thread_quit_pipe_fd, LPOLLIN | LPOLLERR); |
| 2067 | if (ret < 0) { |
| 2068 | goto error; |
| 2069 | } |
| 2070 | |
| 2071 | /* Set state as running. */ |
| 2072 | set_thread_status(true); |
| 2073 | pthread_cleanup_pop(0); |
| 2074 | |
| 2075 | /* This testpoint is after we signal readiness to the parent. */ |
| 2076 | if (testpoint(sessiond_thread_manage_clients)) { |
| 2077 | goto error; |
| 2078 | } |
| 2079 | |
| 2080 | if (testpoint(sessiond_thread_manage_clients_before_loop)) { |
| 2081 | goto error; |
| 2082 | } |
| 2083 | |
| 2084 | health_code_update(); |
| 2085 | |
| 2086 | while (1) { |
| 2087 | const struct cmd_completion_handler *cmd_completion_handler; |
| 2088 | |
| 2089 | DBG("Accepting client command ..."); |
| 2090 | |
| 2091 | /* Inifinite blocking call, waiting for transmission */ |
| 2092 | restart: |
| 2093 | health_poll_entry(); |
| 2094 | ret = lttng_poll_wait(&events, -1); |
| 2095 | health_poll_exit(); |
| 2096 | if (ret < 0) { |
| 2097 | /* |
| 2098 | * Restart interrupted system call. |
| 2099 | */ |
| 2100 | if (errno == EINTR) { |
| 2101 | goto restart; |
| 2102 | } |
| 2103 | goto error; |
| 2104 | } |
| 2105 | |
| 2106 | nb_fd = ret; |
| 2107 | |
| 2108 | for (i = 0; i < nb_fd; i++) { |
| 2109 | revents = LTTNG_POLL_GETEV(&events, i); |
| 2110 | pollfd = LTTNG_POLL_GETFD(&events, i); |
| 2111 | |
| 2112 | health_code_update(); |
| 2113 | |
| 2114 | if (pollfd == thread_quit_pipe_fd) { |
| 2115 | err = 0; |
| 2116 | goto exit; |
| 2117 | } else { |
| 2118 | /* Event on the registration socket */ |
| 2119 | if (revents & LPOLLIN) { |
| 2120 | continue; |
| 2121 | } else if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { |
| 2122 | ERR("Client socket poll error"); |
| 2123 | goto error; |
| 2124 | } else { |
| 2125 | ERR("Unexpected poll events %u for sock %d", revents, pollfd); |
| 2126 | goto error; |
| 2127 | } |
| 2128 | } |
| 2129 | } |
| 2130 | |
| 2131 | DBG("Wait for client response"); |
| 2132 | |
| 2133 | health_code_update(); |
| 2134 | |
| 2135 | sock = lttcomm_accept_unix_sock(client_sock); |
| 2136 | if (sock < 0) { |
| 2137 | goto error; |
| 2138 | } |
| 2139 | |
| 2140 | /* |
| 2141 | * Set the CLOEXEC flag. Return code is useless because either way, the |
| 2142 | * show must go on. |
| 2143 | */ |
| 2144 | (void) utils_set_fd_cloexec(sock); |
| 2145 | |
| 2146 | /* Set socket option for credentials retrieval */ |
| 2147 | ret = lttcomm_setsockopt_creds_unix_sock(sock); |
| 2148 | if (ret < 0) { |
| 2149 | goto error; |
| 2150 | } |
| 2151 | |
| 2152 | /* Allocate context command to process the client request */ |
| 2153 | cmd_ctx = zmalloc(sizeof(struct command_ctx)); |
| 2154 | if (cmd_ctx == NULL) { |
| 2155 | PERROR("zmalloc cmd_ctx"); |
| 2156 | goto error; |
| 2157 | } |
| 2158 | |
| 2159 | /* Allocate data buffer for reception */ |
| 2160 | cmd_ctx->lsm = zmalloc(sizeof(struct lttcomm_session_msg)); |
| 2161 | if (cmd_ctx->lsm == NULL) { |
| 2162 | PERROR("zmalloc cmd_ctx->lsm"); |
| 2163 | goto error; |
| 2164 | } |
| 2165 | |
| 2166 | cmd_ctx->llm = NULL; |
| 2167 | cmd_ctx->session = NULL; |
| 2168 | |
| 2169 | health_code_update(); |
| 2170 | |
| 2171 | /* |
| 2172 | * Data is received from the lttng client. The struct |
| 2173 | * lttcomm_session_msg (lsm) contains the command and data request of |
| 2174 | * the client. |
| 2175 | */ |
| 2176 | DBG("Receiving data from client ..."); |
| 2177 | ret = lttcomm_recv_creds_unix_sock(sock, cmd_ctx->lsm, |
| 2178 | sizeof(struct lttcomm_session_msg), &cmd_ctx->creds); |
| 2179 | if (ret <= 0) { |
| 2180 | DBG("Nothing recv() from client... continuing"); |
| 2181 | ret = close(sock); |
| 2182 | if (ret) { |
| 2183 | PERROR("close"); |
| 2184 | } |
| 2185 | sock = -1; |
| 2186 | clean_command_ctx(&cmd_ctx); |
| 2187 | continue; |
| 2188 | } |
| 2189 | |
| 2190 | health_code_update(); |
| 2191 | |
| 2192 | // TODO: Validate cmd_ctx including sanity check for |
| 2193 | // security purpose. |
| 2194 | |
| 2195 | rcu_thread_online(); |
| 2196 | /* |
| 2197 | * This function dispatch the work to the kernel or userspace tracer |
| 2198 | * libs and fill the lttcomm_lttng_msg data structure of all the needed |
| 2199 | * informations for the client. The command context struct contains |
| 2200 | * everything this function may needs. |
| 2201 | */ |
| 2202 | ret = process_client_msg(cmd_ctx, &sock, &sock_error); |
| 2203 | rcu_thread_offline(); |
| 2204 | if (ret < 0) { |
| 2205 | if (sock >= 0) { |
| 2206 | ret = close(sock); |
| 2207 | if (ret) { |
| 2208 | PERROR("close"); |
| 2209 | } |
| 2210 | } |
| 2211 | sock = -1; |
| 2212 | /* |
| 2213 | * TODO: Inform client somehow of the fatal error. At |
| 2214 | * this point, ret < 0 means that a zmalloc failed |
| 2215 | * (ENOMEM). Error detected but still accept |
| 2216 | * command, unless a socket error has been |
| 2217 | * detected. |
| 2218 | */ |
| 2219 | clean_command_ctx(&cmd_ctx); |
| 2220 | continue; |
| 2221 | } |
| 2222 | |
| 2223 | cmd_completion_handler = cmd_pop_completion_handler(); |
| 2224 | if (cmd_completion_handler) { |
| 2225 | enum lttng_error_code completion_code; |
| 2226 | |
| 2227 | completion_code = cmd_completion_handler->run( |
| 2228 | cmd_completion_handler->data); |
| 2229 | if (completion_code != LTTNG_OK) { |
| 2230 | clean_command_ctx(&cmd_ctx); |
| 2231 | continue; |
| 2232 | } |
| 2233 | } |
| 2234 | |
| 2235 | health_code_update(); |
| 2236 | |
| 2237 | if (sock >= 0) { |
| 2238 | DBG("Sending response (size: %d, retcode: %s (%d))", |
| 2239 | cmd_ctx->lttng_msg_size, |
| 2240 | lttng_strerror(-cmd_ctx->llm->ret_code), |
| 2241 | cmd_ctx->llm->ret_code); |
| 2242 | ret = send_unix_sock(sock, cmd_ctx->llm, |
| 2243 | cmd_ctx->lttng_msg_size); |
| 2244 | if (ret < 0) { |
| 2245 | ERR("Failed to send data back to client"); |
| 2246 | } |
| 2247 | |
| 2248 | /* End of transmission */ |
| 2249 | ret = close(sock); |
| 2250 | if (ret) { |
| 2251 | PERROR("close"); |
| 2252 | } |
| 2253 | } |
| 2254 | sock = -1; |
| 2255 | |
| 2256 | clean_command_ctx(&cmd_ctx); |
| 2257 | |
| 2258 | health_code_update(); |
| 2259 | } |
| 2260 | |
| 2261 | exit: |
| 2262 | error: |
| 2263 | if (sock >= 0) { |
| 2264 | ret = close(sock); |
| 2265 | if (ret) { |
| 2266 | PERROR("close"); |
| 2267 | } |
| 2268 | } |
| 2269 | |
| 2270 | lttng_poll_clean(&events); |
| 2271 | clean_command_ctx(&cmd_ctx); |
| 2272 | |
| 2273 | error_listen: |
| 2274 | error_create_poll: |
| 2275 | unlink(config.client_unix_sock_path.value); |
| 2276 | if (client_sock >= 0) { |
| 2277 | ret = close(client_sock); |
| 2278 | if (ret) { |
| 2279 | PERROR("close"); |
| 2280 | } |
| 2281 | } |
| 2282 | |
| 2283 | if (err) { |
| 2284 | health_error(); |
| 2285 | ERR("Health error occurred in %s", __func__); |
| 2286 | } |
| 2287 | |
| 2288 | health_unregister(health_sessiond); |
| 2289 | |
| 2290 | DBG("Client thread dying"); |
| 2291 | |
| 2292 | rcu_unregister_thread(); |
| 2293 | return NULL; |
| 2294 | } |
| 2295 | |
| 2296 | static |
| 2297 | bool shutdown_client_thread(void *thread_data) |
| 2298 | { |
| 2299 | struct lttng_pipe *client_quit_pipe = thread_data; |
| 2300 | const int write_fd = lttng_pipe_get_writefd(client_quit_pipe); |
| 2301 | |
| 2302 | return notify_thread_pipe(write_fd) == 1; |
| 2303 | } |
| 2304 | |
| 2305 | struct lttng_thread *launch_client_thread(void) |
| 2306 | { |
| 2307 | bool thread_running; |
| 2308 | struct lttng_pipe *client_quit_pipe; |
| 2309 | struct lttng_thread *thread; |
| 2310 | |
| 2311 | sem_init(&thread_state.ready, 0, 0); |
| 2312 | client_quit_pipe = lttng_pipe_open(FD_CLOEXEC); |
| 2313 | if (!client_quit_pipe) { |
| 2314 | goto error; |
| 2315 | } |
| 2316 | |
| 2317 | thread = lttng_thread_create("Client management", |
| 2318 | thread_manage_clients, |
| 2319 | shutdown_client_thread, |
| 2320 | cleanup_client_thread, |
| 2321 | client_quit_pipe); |
| 2322 | if (!thread) { |
| 2323 | goto error; |
| 2324 | } |
| 2325 | |
| 2326 | /* |
| 2327 | * This thread is part of the threads that need to be fully |
| 2328 | * initialized before the session daemon is marked as "ready". |
| 2329 | */ |
| 2330 | thread_running = wait_thread_status(); |
| 2331 | if (!thread_running) { |
| 2332 | lttng_thread_put(thread); |
| 2333 | thread = NULL; |
| 2334 | } |
| 2335 | return thread; |
| 2336 | error: |
| 2337 | cleanup_client_thread(client_quit_pipe); |
| 2338 | return NULL; |
| 2339 | } |