| 1 | /* |
| 2 | * Copyright (C) 2011 EfficiOS Inc. |
| 3 | * Copyright (C) 2011 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
| 4 | * Copyright (C) 2013 Jérémie Galarneau <jeremie.galarneau@efficios.com> |
| 5 | * |
| 6 | * SPDX-License-Identifier: GPL-2.0-only |
| 7 | * |
| 8 | */ |
| 9 | |
| 10 | #define _LGPL_SOURCE |
| 11 | #include "agent-thread.hpp" |
| 12 | #include "agent.hpp" |
| 13 | #include "buffer-registry.hpp" |
| 14 | #include "channel.hpp" |
| 15 | #include "client.hpp" |
| 16 | #include "cmd.hpp" |
| 17 | #include "consumer.hpp" |
| 18 | #include "context.hpp" |
| 19 | #include "dispatch.hpp" |
| 20 | #include "event-notifier-error-accounting.hpp" |
| 21 | #include "event.hpp" |
| 22 | #include "fd-limit.hpp" |
| 23 | #include "health-sessiond.hpp" |
| 24 | #include "kernel-consumer.hpp" |
| 25 | #include "kernel.hpp" |
| 26 | #include "lttng-sessiond.hpp" |
| 27 | #include "lttng-ust-ctl.hpp" |
| 28 | #include "manage-apps.hpp" |
| 29 | #include "manage-kernel.hpp" |
| 30 | #include "modprobe.hpp" |
| 31 | #include "notification-thread-commands.hpp" |
| 32 | #include "notification-thread.hpp" |
| 33 | #include "notify-apps.hpp" |
| 34 | #include "register.hpp" |
| 35 | #include "rotation-thread.hpp" |
| 36 | #include "save.hpp" |
| 37 | #include "sessiond-config.hpp" |
| 38 | #include "testpoint.hpp" |
| 39 | #include "thread.hpp" |
| 40 | #include "timer.hpp" |
| 41 | #include "ust-consumer.hpp" |
| 42 | #include "ust-sigbus.hpp" |
| 43 | #include "utils.hpp" |
| 44 | |
| 45 | #include <common/common.hpp> |
| 46 | #include <common/compat/getenv.hpp> |
| 47 | #include <common/compat/socket.hpp> |
| 48 | #include <common/config/session-config.hpp> |
| 49 | #include <common/daemonize.hpp> |
| 50 | #include <common/defaults.hpp> |
| 51 | #include <common/dynamic-buffer.hpp> |
| 52 | #include <common/futex.hpp> |
| 53 | #include <common/ini-config/ini-config.hpp> |
| 54 | #include <common/kernel-consumer/kernel-consumer.hpp> |
| 55 | #include <common/logging-utils.hpp> |
| 56 | #include <common/path.hpp> |
| 57 | #include <common/relayd/relayd.hpp> |
| 58 | #include <common/utils.hpp> |
| 59 | |
| 60 | #include <lttng/event-internal.hpp> |
| 61 | |
| 62 | #include <ctype.h> |
| 63 | #include <getopt.h> |
| 64 | #include <grp.h> |
| 65 | #include <inttypes.h> |
| 66 | #include <limits.h> |
| 67 | #include <paths.h> |
| 68 | #include <pthread.h> |
| 69 | #include <signal.h> |
| 70 | #include <stdio.h> |
| 71 | #include <stdlib.h> |
| 72 | #include <string.h> |
| 73 | #include <sys/mman.h> |
| 74 | #include <sys/mount.h> |
| 75 | #include <sys/resource.h> |
| 76 | #include <sys/socket.h> |
| 77 | #include <sys/stat.h> |
| 78 | #include <sys/types.h> |
| 79 | #include <sys/wait.h> |
| 80 | #include <unistd.h> |
| 81 | #include <urcu/uatomic.h> |
| 82 | |
| 83 | static const char *help_msg = |
| 84 | #ifdef LTTNG_EMBED_HELP |
| 85 | #include <lttng-sessiond.8.h> |
| 86 | #else |
| 87 | nullptr |
| 88 | #endif |
| 89 | ; |
| 90 | |
| 91 | #define EVENT_NOTIFIER_ERROR_COUNTER_NUMBER_OF_BUCKET_MAX 65535 |
| 92 | #define EVENT_NOTIFIER_ERROR_BUFFER_SIZE_BASE_OPTION_STR "event-notifier-error-buffer-size" |
| 93 | #define EVENT_NOTIFIER_ERROR_BUFFER_SIZE_KERNEL_OPTION_STR \ |
| 94 | EVENT_NOTIFIER_ERROR_BUFFER_SIZE_BASE_OPTION_STR "-kernel" |
| 95 | #define EVENT_NOTIFIER_ERROR_BUFFER_SIZE_USERSPACE_OPTION_STR \ |
| 96 | EVENT_NOTIFIER_ERROR_BUFFER_SIZE_BASE_OPTION_STR "-userspace" |
| 97 | |
| 98 | const char *progname; |
| 99 | static int lockfile_fd = -1; |
| 100 | static int opt_print_version; |
| 101 | |
| 102 | /* Set to 1 when a SIGUSR1 signal is received. */ |
| 103 | static int recv_child_signal; |
| 104 | |
| 105 | /* Command line options */ |
| 106 | static const struct option long_options[] = { |
| 107 | { "client-sock", required_argument, nullptr, 'c' }, |
| 108 | { "apps-sock", required_argument, nullptr, 'a' }, |
| 109 | { "kconsumerd-cmd-sock", required_argument, nullptr, '\0' }, |
| 110 | { "kconsumerd-err-sock", required_argument, nullptr, '\0' }, |
| 111 | { "ustconsumerd32-cmd-sock", required_argument, nullptr, '\0' }, |
| 112 | { "ustconsumerd32-err-sock", required_argument, nullptr, '\0' }, |
| 113 | { "ustconsumerd64-cmd-sock", required_argument, nullptr, '\0' }, |
| 114 | { "ustconsumerd64-err-sock", required_argument, nullptr, '\0' }, |
| 115 | { "consumerd32-path", required_argument, nullptr, '\0' }, |
| 116 | { "consumerd32-libdir", required_argument, nullptr, '\0' }, |
| 117 | { "consumerd64-path", required_argument, nullptr, '\0' }, |
| 118 | { "consumerd64-libdir", required_argument, nullptr, '\0' }, |
| 119 | { "daemonize", no_argument, nullptr, 'd' }, |
| 120 | { "background", no_argument, nullptr, 'b' }, |
| 121 | { "sig-parent", no_argument, nullptr, 'S' }, |
| 122 | { "help", no_argument, nullptr, 'h' }, |
| 123 | { "group", required_argument, nullptr, 'g' }, |
| 124 | { "version", no_argument, nullptr, 'V' }, |
| 125 | { "quiet", no_argument, nullptr, 'q' }, |
| 126 | { "verbose", no_argument, nullptr, 'v' }, |
| 127 | { "verbose-consumer", no_argument, nullptr, '\0' }, |
| 128 | { "no-kernel", no_argument, nullptr, '\0' }, |
| 129 | { "pidfile", required_argument, nullptr, 'p' }, |
| 130 | { "agent-tcp-port", required_argument, nullptr, '\0' }, |
| 131 | { "config", required_argument, nullptr, 'f' }, |
| 132 | { "load", required_argument, nullptr, 'l' }, |
| 133 | { "kmod-probes", required_argument, nullptr, '\0' }, |
| 134 | { "extra-kmod-probes", required_argument, nullptr, '\0' }, |
| 135 | { EVENT_NOTIFIER_ERROR_BUFFER_SIZE_KERNEL_OPTION_STR, required_argument, nullptr, '\0' }, |
| 136 | { EVENT_NOTIFIER_ERROR_BUFFER_SIZE_USERSPACE_OPTION_STR, required_argument, nullptr, '\0' }, |
| 137 | { nullptr, 0, nullptr, 0 } |
| 138 | }; |
| 139 | |
| 140 | /* Command line options to ignore from configuration file */ |
| 141 | static const char *config_ignore_options[] = { "help", "version", "config" }; |
| 142 | |
| 143 | /* |
| 144 | * This pipe is used to inform the thread managing application communication |
| 145 | * that a command is queued and ready to be processed. |
| 146 | */ |
| 147 | static int apps_cmd_pipe[2] = { -1, -1 }; |
| 148 | static int apps_cmd_notify_pipe[2] = { -1, -1 }; |
| 149 | |
| 150 | /* |
| 151 | * UST registration command queue. This queue is tied with a futex and uses a N |
| 152 | * wakers / 1 waiter implemented and detailed in futex.c/.h |
| 153 | * |
| 154 | * The thread_registration_apps and thread_dispatch_ust_registration uses this |
| 155 | * queue along with the wait/wake scheme. The thread_manage_apps receives down |
| 156 | * the line new application socket and monitors it for any I/O error or clean |
| 157 | * close that triggers an unregistration of the application. |
| 158 | */ |
| 159 | static struct ust_cmd_queue ust_cmd_queue; |
| 160 | |
| 161 | /* |
| 162 | * Section name to look for in the daemon configuration file. |
| 163 | */ |
| 164 | static const char *const config_section_name = "sessiond"; |
| 165 | |
| 166 | /* Am I root or not. Set to 1 if the daemon is running as root */ |
| 167 | static int is_root; |
| 168 | |
| 169 | /* |
| 170 | * Notify the main thread to initiate the teardown of the worker threads by |
| 171 | * writing to the main quit pipe. |
| 172 | */ |
| 173 | static void notify_main_quit_pipe() |
| 174 | { |
| 175 | int ret; |
| 176 | |
| 177 | /* Stopping all threads */ |
| 178 | DBG("Notify the main thread to terminate all worker threads"); |
| 179 | ret = sessiond_notify_main_quit_pipe(); |
| 180 | if (ret < 0) { |
| 181 | ERR("write error on main quit pipe"); |
| 182 | } |
| 183 | } |
| 184 | |
| 185 | /* |
| 186 | * Close every consumer sockets. |
| 187 | */ |
| 188 | static void close_consumer_sockets() |
| 189 | { |
| 190 | int ret; |
| 191 | |
| 192 | if (the_kconsumer_data.err_sock >= 0) { |
| 193 | ret = close(the_kconsumer_data.err_sock); |
| 194 | if (ret < 0) { |
| 195 | PERROR("kernel consumer err_sock close"); |
| 196 | } |
| 197 | } |
| 198 | if (the_ustconsumer32_data.err_sock >= 0) { |
| 199 | ret = close(the_ustconsumer32_data.err_sock); |
| 200 | if (ret < 0) { |
| 201 | PERROR("UST consumerd32 err_sock close"); |
| 202 | } |
| 203 | } |
| 204 | if (the_ustconsumer64_data.err_sock >= 0) { |
| 205 | ret = close(the_ustconsumer64_data.err_sock); |
| 206 | if (ret < 0) { |
| 207 | PERROR("UST consumerd64 err_sock close"); |
| 208 | } |
| 209 | } |
| 210 | if (the_kconsumer_data.cmd_sock >= 0) { |
| 211 | ret = close(the_kconsumer_data.cmd_sock); |
| 212 | if (ret < 0) { |
| 213 | PERROR("kernel consumer cmd_sock close"); |
| 214 | } |
| 215 | } |
| 216 | if (the_ustconsumer32_data.cmd_sock >= 0) { |
| 217 | ret = close(the_ustconsumer32_data.cmd_sock); |
| 218 | if (ret < 0) { |
| 219 | PERROR("UST consumerd32 cmd_sock close"); |
| 220 | } |
| 221 | } |
| 222 | if (the_ustconsumer64_data.cmd_sock >= 0) { |
| 223 | ret = close(the_ustconsumer64_data.cmd_sock); |
| 224 | if (ret < 0) { |
| 225 | PERROR("UST consumerd64 cmd_sock close"); |
| 226 | } |
| 227 | } |
| 228 | if (the_kconsumer_data.channel_monitor_pipe >= 0) { |
| 229 | ret = close(the_kconsumer_data.channel_monitor_pipe); |
| 230 | if (ret < 0) { |
| 231 | PERROR("kernel consumer channel monitor pipe close"); |
| 232 | } |
| 233 | } |
| 234 | if (the_ustconsumer32_data.channel_monitor_pipe >= 0) { |
| 235 | ret = close(the_ustconsumer32_data.channel_monitor_pipe); |
| 236 | if (ret < 0) { |
| 237 | PERROR("UST consumerd32 channel monitor pipe close"); |
| 238 | } |
| 239 | } |
| 240 | if (the_ustconsumer64_data.channel_monitor_pipe >= 0) { |
| 241 | ret = close(the_ustconsumer64_data.channel_monitor_pipe); |
| 242 | if (ret < 0) { |
| 243 | PERROR("UST consumerd64 channel monitor pipe close"); |
| 244 | } |
| 245 | } |
| 246 | } |
| 247 | |
| 248 | /* |
| 249 | * Wait on consumer process termination. |
| 250 | * |
| 251 | * Need to be called with the consumer data lock held or from a context |
| 252 | * ensuring no concurrent access to data (e.g: cleanup). |
| 253 | */ |
| 254 | static void wait_consumer(struct consumer_data *consumer_data) |
| 255 | { |
| 256 | pid_t ret; |
| 257 | int status; |
| 258 | |
| 259 | if (consumer_data->pid <= 0) { |
| 260 | return; |
| 261 | } |
| 262 | |
| 263 | DBG("Waiting for complete teardown of consumerd (PID: %d)", consumer_data->pid); |
| 264 | ret = waitpid(consumer_data->pid, &status, 0); |
| 265 | if (ret == -1) { |
| 266 | PERROR("consumerd waitpid pid: %d", consumer_data->pid) |
| 267 | } else if (!WIFEXITED(status)) { |
| 268 | ERR("consumerd termination with error: %d", WEXITSTATUS(ret)); |
| 269 | } |
| 270 | consumer_data->pid = 0; |
| 271 | } |
| 272 | |
| 273 | /* |
| 274 | * Cleanup the session daemon's data structures. |
| 275 | */ |
| 276 | static void sessiond_cleanup() |
| 277 | { |
| 278 | int ret; |
| 279 | struct ltt_session_list *session_list = session_get_list(); |
| 280 | |
| 281 | DBG("Cleanup sessiond"); |
| 282 | |
| 283 | /* |
| 284 | * Close the main quit pipe. It has already done its job, since we are |
| 285 | * now cleaning up. |
| 286 | */ |
| 287 | sessiond_close_main_quit_pipe(); |
| 288 | |
| 289 | /* Close all other pipes. */ |
| 290 | utils_close_pipe(apps_cmd_pipe); |
| 291 | utils_close_pipe(apps_cmd_notify_pipe); |
| 292 | utils_close_pipe(the_kernel_poll_pipe); |
| 293 | |
| 294 | ret = remove(the_config.pid_file_path.value); |
| 295 | if (ret < 0) { |
| 296 | PERROR("remove pidfile %s", the_config.pid_file_path.value); |
| 297 | } |
| 298 | |
| 299 | DBG("Removing sessiond and consumerd content of directory %s", the_config.rundir.value); |
| 300 | |
| 301 | /* sessiond */ |
| 302 | DBG("Removing %s", the_config.pid_file_path.value); |
| 303 | (void) unlink(the_config.pid_file_path.value); |
| 304 | |
| 305 | DBG("Removing %s", the_config.agent_port_file_path.value); |
| 306 | (void) unlink(the_config.agent_port_file_path.value); |
| 307 | |
| 308 | /* kconsumerd */ |
| 309 | DBG("Removing %s", the_kconsumer_data.err_unix_sock_path); |
| 310 | (void) unlink(the_kconsumer_data.err_unix_sock_path); |
| 311 | |
| 312 | DBG("Removing directory %s", the_config.kconsumerd_path.value); |
| 313 | (void) rmdir(the_config.kconsumerd_path.value); |
| 314 | |
| 315 | /* ust consumerd 32 */ |
| 316 | DBG("Removing %s", the_config.consumerd32_err_unix_sock_path.value); |
| 317 | (void) unlink(the_config.consumerd32_err_unix_sock_path.value); |
| 318 | |
| 319 | DBG("Removing directory %s", the_config.consumerd32_path.value); |
| 320 | (void) rmdir(the_config.consumerd32_path.value); |
| 321 | |
| 322 | /* ust consumerd 64 */ |
| 323 | DBG("Removing %s", the_config.consumerd64_err_unix_sock_path.value); |
| 324 | (void) unlink(the_config.consumerd64_err_unix_sock_path.value); |
| 325 | |
| 326 | DBG("Removing directory %s", the_config.consumerd64_path.value); |
| 327 | (void) rmdir(the_config.consumerd64_path.value); |
| 328 | |
| 329 | pthread_mutex_destroy(&session_list->lock); |
| 330 | |
| 331 | DBG("Cleaning up all per-event notifier domain agents"); |
| 332 | agent_by_event_notifier_domain_ht_destroy(); |
| 333 | |
| 334 | DBG("Cleaning up all agent apps"); |
| 335 | agent_app_ht_clean(); |
| 336 | DBG("Closing all UST sockets"); |
| 337 | ust_app_clean_list(); |
| 338 | buffer_reg_destroy_registries(); |
| 339 | |
| 340 | close_consumer_sockets(); |
| 341 | |
| 342 | wait_consumer(&the_kconsumer_data); |
| 343 | wait_consumer(&the_ustconsumer64_data); |
| 344 | wait_consumer(&the_ustconsumer32_data); |
| 345 | |
| 346 | if (is_root && !the_config.no_kernel) { |
| 347 | cleanup_kernel_tracer(); |
| 348 | } |
| 349 | |
| 350 | /* |
| 351 | * We do NOT rmdir rundir because there are other processes |
| 352 | * using it, for instance lttng-relayd, which can start in |
| 353 | * parallel with this teardown. |
| 354 | */ |
| 355 | } |
| 356 | |
| 357 | /* |
| 358 | * Cleanup the daemon's option data structures. |
| 359 | */ |
| 360 | static void sessiond_cleanup_options() |
| 361 | { |
| 362 | DBG("Cleaning up options"); |
| 363 | |
| 364 | sessiond_config_fini(&the_config); |
| 365 | |
| 366 | run_as_destroy_worker(); |
| 367 | } |
| 368 | |
| 369 | static int string_match(const char *str1, const char *str2) |
| 370 | { |
| 371 | return (str1 && str2) && !strcmp(str1, str2); |
| 372 | } |
| 373 | |
| 374 | /* |
| 375 | * Take an option from the getopt output and set it in the right variable to be |
| 376 | * used later. |
| 377 | * |
| 378 | * Return 0 on success else a negative value. |
| 379 | */ |
| 380 | static int set_option(int opt, const char *arg, const char *optname) |
| 381 | { |
| 382 | int ret = 0; |
| 383 | |
| 384 | if (string_match(optname, "client-sock") || opt == 'c') { |
| 385 | if (!arg || *arg == '\0') { |
| 386 | ret = -EINVAL; |
| 387 | goto end; |
| 388 | } |
| 389 | if (lttng_is_setuid_setgid()) { |
| 390 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", |
| 391 | "-c, --client-sock"); |
| 392 | } else { |
| 393 | config_string_set(&the_config.client_unix_sock_path, strdup(arg)); |
| 394 | if (!the_config.client_unix_sock_path.value) { |
| 395 | ret = -ENOMEM; |
| 396 | PERROR("strdup"); |
| 397 | } |
| 398 | } |
| 399 | } else if (string_match(optname, "apps-sock") || opt == 'a') { |
| 400 | if (!arg || *arg == '\0') { |
| 401 | ret = -EINVAL; |
| 402 | goto end; |
| 403 | } |
| 404 | if (lttng_is_setuid_setgid()) { |
| 405 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", |
| 406 | "-a, --apps-sock"); |
| 407 | } else { |
| 408 | config_string_set(&the_config.apps_unix_sock_path, strdup(arg)); |
| 409 | if (!the_config.apps_unix_sock_path.value) { |
| 410 | ret = -ENOMEM; |
| 411 | PERROR("strdup"); |
| 412 | } |
| 413 | } |
| 414 | } else if (string_match(optname, "daemonize") || opt == 'd') { |
| 415 | the_config.daemonize = true; |
| 416 | } else if (string_match(optname, "background") || opt == 'b') { |
| 417 | the_config.background = true; |
| 418 | } else if (string_match(optname, "group") || opt == 'g') { |
| 419 | if (!arg || *arg == '\0') { |
| 420 | ret = -EINVAL; |
| 421 | goto end; |
| 422 | } |
| 423 | if (lttng_is_setuid_setgid()) { |
| 424 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", |
| 425 | "-g, --group"); |
| 426 | } else { |
| 427 | config_string_set(&the_config.tracing_group_name, strdup(arg)); |
| 428 | if (!the_config.tracing_group_name.value) { |
| 429 | ret = -ENOMEM; |
| 430 | PERROR("strdup"); |
| 431 | } |
| 432 | } |
| 433 | } else if (string_match(optname, "help") || opt == 'h') { |
| 434 | ret = utils_show_help(8, "lttng-sessiond", help_msg); |
| 435 | if (ret) { |
| 436 | ERR("Cannot show --help for `lttng-sessiond`"); |
| 437 | perror("exec"); |
| 438 | } |
| 439 | exit(ret ? EXIT_FAILURE : EXIT_SUCCESS); |
| 440 | } else if (string_match(optname, "version") || opt == 'V') { |
| 441 | opt_print_version = 1; |
| 442 | } else if (string_match(optname, "sig-parent") || opt == 'S') { |
| 443 | the_config.sig_parent = true; |
| 444 | } else if (string_match(optname, "kconsumerd-err-sock")) { |
| 445 | if (!arg || *arg == '\0') { |
| 446 | ret = -EINVAL; |
| 447 | goto end; |
| 448 | } |
| 449 | if (lttng_is_setuid_setgid()) { |
| 450 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", |
| 451 | "--kconsumerd-err-sock"); |
| 452 | } else { |
| 453 | config_string_set(&the_config.kconsumerd_err_unix_sock_path, strdup(arg)); |
| 454 | if (!the_config.kconsumerd_err_unix_sock_path.value) { |
| 455 | ret = -ENOMEM; |
| 456 | PERROR("strdup"); |
| 457 | } |
| 458 | } |
| 459 | } else if (string_match(optname, "kconsumerd-cmd-sock")) { |
| 460 | if (!arg || *arg == '\0') { |
| 461 | ret = -EINVAL; |
| 462 | goto end; |
| 463 | } |
| 464 | if (lttng_is_setuid_setgid()) { |
| 465 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", |
| 466 | "--kconsumerd-cmd-sock"); |
| 467 | } else { |
| 468 | config_string_set(&the_config.kconsumerd_cmd_unix_sock_path, strdup(arg)); |
| 469 | if (!the_config.kconsumerd_cmd_unix_sock_path.value) { |
| 470 | ret = -ENOMEM; |
| 471 | PERROR("strdup"); |
| 472 | } |
| 473 | } |
| 474 | } else if (string_match(optname, "ustconsumerd64-err-sock")) { |
| 475 | if (!arg || *arg == '\0') { |
| 476 | ret = -EINVAL; |
| 477 | goto end; |
| 478 | } |
| 479 | if (lttng_is_setuid_setgid()) { |
| 480 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", |
| 481 | "--ustconsumerd64-err-sock"); |
| 482 | } else { |
| 483 | config_string_set(&the_config.consumerd64_err_unix_sock_path, strdup(arg)); |
| 484 | if (!the_config.consumerd64_err_unix_sock_path.value) { |
| 485 | ret = -ENOMEM; |
| 486 | PERROR("strdup"); |
| 487 | } |
| 488 | } |
| 489 | } else if (string_match(optname, "ustconsumerd64-cmd-sock")) { |
| 490 | if (!arg || *arg == '\0') { |
| 491 | ret = -EINVAL; |
| 492 | goto end; |
| 493 | } |
| 494 | if (lttng_is_setuid_setgid()) { |
| 495 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", |
| 496 | "--ustconsumerd64-cmd-sock"); |
| 497 | } else { |
| 498 | config_string_set(&the_config.consumerd64_cmd_unix_sock_path, strdup(arg)); |
| 499 | if (!the_config.consumerd64_cmd_unix_sock_path.value) { |
| 500 | ret = -ENOMEM; |
| 501 | PERROR("strdup"); |
| 502 | } |
| 503 | } |
| 504 | } else if (string_match(optname, "ustconsumerd32-err-sock")) { |
| 505 | if (!arg || *arg == '\0') { |
| 506 | ret = -EINVAL; |
| 507 | goto end; |
| 508 | } |
| 509 | if (lttng_is_setuid_setgid()) { |
| 510 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", |
| 511 | "--ustconsumerd32-err-sock"); |
| 512 | } else { |
| 513 | config_string_set(&the_config.consumerd32_err_unix_sock_path, strdup(arg)); |
| 514 | if (!the_config.consumerd32_err_unix_sock_path.value) { |
| 515 | ret = -ENOMEM; |
| 516 | PERROR("strdup"); |
| 517 | } |
| 518 | } |
| 519 | } else if (string_match(optname, "ustconsumerd32-cmd-sock")) { |
| 520 | if (!arg || *arg == '\0') { |
| 521 | ret = -EINVAL; |
| 522 | goto end; |
| 523 | } |
| 524 | if (lttng_is_setuid_setgid()) { |
| 525 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", |
| 526 | "--ustconsumerd32-cmd-sock"); |
| 527 | } else { |
| 528 | config_string_set(&the_config.consumerd32_cmd_unix_sock_path, strdup(arg)); |
| 529 | if (!the_config.consumerd32_cmd_unix_sock_path.value) { |
| 530 | ret = -ENOMEM; |
| 531 | PERROR("strdup"); |
| 532 | } |
| 533 | } |
| 534 | } else if (string_match(optname, "no-kernel")) { |
| 535 | the_config.no_kernel = true; |
| 536 | } else if (string_match(optname, "quiet") || opt == 'q') { |
| 537 | the_config.quiet = true; |
| 538 | } else if (string_match(optname, "verbose") || opt == 'v') { |
| 539 | /* Verbose level can increase using multiple -v */ |
| 540 | if (arg) { |
| 541 | /* Value obtained from config file */ |
| 542 | the_config.verbose = config_parse_value(arg); |
| 543 | } else { |
| 544 | /* -v used on command line */ |
| 545 | the_config.verbose++; |
| 546 | } |
| 547 | /* Clamp value to [0, 3] */ |
| 548 | the_config.verbose = the_config.verbose < 0 ? |
| 549 | 0 : |
| 550 | (the_config.verbose <= 3 ? the_config.verbose : 3); |
| 551 | } else if (string_match(optname, "verbose-consumer")) { |
| 552 | if (arg) { |
| 553 | the_config.verbose_consumer = config_parse_value(arg); |
| 554 | } else { |
| 555 | the_config.verbose_consumer++; |
| 556 | } |
| 557 | } else if (string_match(optname, "consumerd32-path")) { |
| 558 | if (!arg || *arg == '\0') { |
| 559 | ret = -EINVAL; |
| 560 | goto end; |
| 561 | } |
| 562 | if (lttng_is_setuid_setgid()) { |
| 563 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", |
| 564 | "--consumerd32-path"); |
| 565 | } else { |
| 566 | config_string_set(&the_config.consumerd32_bin_path, strdup(arg)); |
| 567 | if (!the_config.consumerd32_bin_path.value) { |
| 568 | PERROR("strdup"); |
| 569 | ret = -ENOMEM; |
| 570 | } |
| 571 | } |
| 572 | } else if (string_match(optname, "consumerd32-libdir")) { |
| 573 | if (!arg || *arg == '\0') { |
| 574 | ret = -EINVAL; |
| 575 | goto end; |
| 576 | } |
| 577 | if (lttng_is_setuid_setgid()) { |
| 578 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", |
| 579 | "--consumerd32-libdir"); |
| 580 | } else { |
| 581 | config_string_set(&the_config.consumerd32_lib_dir, strdup(arg)); |
| 582 | if (!the_config.consumerd32_lib_dir.value) { |
| 583 | PERROR("strdup"); |
| 584 | ret = -ENOMEM; |
| 585 | } |
| 586 | } |
| 587 | } else if (string_match(optname, "consumerd64-path")) { |
| 588 | if (!arg || *arg == '\0') { |
| 589 | ret = -EINVAL; |
| 590 | goto end; |
| 591 | } |
| 592 | if (lttng_is_setuid_setgid()) { |
| 593 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", |
| 594 | "--consumerd64-path"); |
| 595 | } else { |
| 596 | config_string_set(&the_config.consumerd64_bin_path, strdup(arg)); |
| 597 | if (!the_config.consumerd64_bin_path.value) { |
| 598 | PERROR("strdup"); |
| 599 | ret = -ENOMEM; |
| 600 | } |
| 601 | } |
| 602 | } else if (string_match(optname, "consumerd64-libdir")) { |
| 603 | if (!arg || *arg == '\0') { |
| 604 | ret = -EINVAL; |
| 605 | goto end; |
| 606 | } |
| 607 | if (lttng_is_setuid_setgid()) { |
| 608 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", |
| 609 | "--consumerd64-libdir"); |
| 610 | } else { |
| 611 | config_string_set(&the_config.consumerd64_lib_dir, strdup(arg)); |
| 612 | if (!the_config.consumerd64_lib_dir.value) { |
| 613 | PERROR("strdup"); |
| 614 | ret = -ENOMEM; |
| 615 | } |
| 616 | } |
| 617 | } else if (string_match(optname, "pidfile") || opt == 'p') { |
| 618 | if (!arg || *arg == '\0') { |
| 619 | ret = -EINVAL; |
| 620 | goto end; |
| 621 | } |
| 622 | if (lttng_is_setuid_setgid()) { |
| 623 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", |
| 624 | "-p, --pidfile"); |
| 625 | } else { |
| 626 | config_string_set(&the_config.pid_file_path, strdup(arg)); |
| 627 | if (!the_config.pid_file_path.value) { |
| 628 | PERROR("strdup"); |
| 629 | ret = -ENOMEM; |
| 630 | } |
| 631 | } |
| 632 | } else if (string_match(optname, "agent-tcp-port")) { |
| 633 | if (!arg || *arg == '\0') { |
| 634 | ret = -EINVAL; |
| 635 | goto end; |
| 636 | } |
| 637 | if (lttng_is_setuid_setgid()) { |
| 638 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", |
| 639 | "--agent-tcp-port"); |
| 640 | } else { |
| 641 | unsigned long v; |
| 642 | |
| 643 | errno = 0; |
| 644 | v = strtoul(arg, nullptr, 0); |
| 645 | if (errno != 0 || !isdigit(arg[0])) { |
| 646 | ERR("Wrong value in --agent-tcp-port parameter: %s", arg); |
| 647 | return -1; |
| 648 | } |
| 649 | if (v == 0 || v >= 65535) { |
| 650 | ERR("Port overflow in --agent-tcp-port parameter: %s", arg); |
| 651 | return -1; |
| 652 | } |
| 653 | the_config.agent_tcp_port.begin = the_config.agent_tcp_port.end = (int) v; |
| 654 | DBG3("Agent TCP port set to non default: %i", (int) v); |
| 655 | } |
| 656 | } else if (string_match(optname, "load") || opt == 'l') { |
| 657 | if (!arg || *arg == '\0') { |
| 658 | ret = -EINVAL; |
| 659 | goto end; |
| 660 | } |
| 661 | if (lttng_is_setuid_setgid()) { |
| 662 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", |
| 663 | "-l, --load"); |
| 664 | } else { |
| 665 | config_string_set(&the_config.load_session_path, strdup(arg)); |
| 666 | if (!the_config.load_session_path.value) { |
| 667 | PERROR("strdup"); |
| 668 | ret = -ENOMEM; |
| 669 | } |
| 670 | } |
| 671 | } else if (string_match(optname, "kmod-probes")) { |
| 672 | if (!arg || *arg == '\0') { |
| 673 | ret = -EINVAL; |
| 674 | goto end; |
| 675 | } |
| 676 | if (lttng_is_setuid_setgid()) { |
| 677 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", |
| 678 | "--kmod-probes"); |
| 679 | } else { |
| 680 | config_string_set(&the_config.kmod_probes_list, strdup(arg)); |
| 681 | if (!the_config.kmod_probes_list.value) { |
| 682 | PERROR("strdup"); |
| 683 | ret = -ENOMEM; |
| 684 | } |
| 685 | } |
| 686 | } else if (string_match(optname, "extra-kmod-probes")) { |
| 687 | if (!arg || *arg == '\0') { |
| 688 | ret = -EINVAL; |
| 689 | goto end; |
| 690 | } |
| 691 | if (lttng_is_setuid_setgid()) { |
| 692 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", |
| 693 | "--extra-kmod-probes"); |
| 694 | } else { |
| 695 | config_string_set(&the_config.kmod_extra_probes_list, strdup(arg)); |
| 696 | if (!the_config.kmod_extra_probes_list.value) { |
| 697 | PERROR("strdup"); |
| 698 | ret = -ENOMEM; |
| 699 | } |
| 700 | } |
| 701 | } else if (string_match(optname, EVENT_NOTIFIER_ERROR_BUFFER_SIZE_KERNEL_OPTION_STR)) { |
| 702 | unsigned long v; |
| 703 | |
| 704 | errno = 0; |
| 705 | v = strtoul(arg, nullptr, 0); |
| 706 | if (errno != 0 || !isdigit(arg[0])) { |
| 707 | ERR("Wrong value in --%s parameter: %s", |
| 708 | EVENT_NOTIFIER_ERROR_BUFFER_SIZE_KERNEL_OPTION_STR, |
| 709 | arg); |
| 710 | return -1; |
| 711 | } |
| 712 | if (v == 0 || v >= EVENT_NOTIFIER_ERROR_COUNTER_NUMBER_OF_BUCKET_MAX) { |
| 713 | ERR("Value out of range for --%s parameter: %s", |
| 714 | EVENT_NOTIFIER_ERROR_BUFFER_SIZE_KERNEL_OPTION_STR, |
| 715 | arg); |
| 716 | return -1; |
| 717 | } |
| 718 | the_config.event_notifier_buffer_size_kernel = (int) v; |
| 719 | DBG3("Number of event notifier error buffer kernel size to non default: %i", |
| 720 | the_config.event_notifier_buffer_size_kernel); |
| 721 | goto end; |
| 722 | } else if (string_match(optname, EVENT_NOTIFIER_ERROR_BUFFER_SIZE_USERSPACE_OPTION_STR)) { |
| 723 | unsigned long v; |
| 724 | |
| 725 | errno = 0; |
| 726 | v = strtoul(arg, nullptr, 0); |
| 727 | if (errno != 0 || !isdigit(arg[0])) { |
| 728 | ERR("Wrong value in --%s parameter: %s", |
| 729 | EVENT_NOTIFIER_ERROR_BUFFER_SIZE_USERSPACE_OPTION_STR, |
| 730 | arg); |
| 731 | return -1; |
| 732 | } |
| 733 | if (v == 0 || v >= EVENT_NOTIFIER_ERROR_COUNTER_NUMBER_OF_BUCKET_MAX) { |
| 734 | ERR("Value out of range for --%s parameter: %s", |
| 735 | EVENT_NOTIFIER_ERROR_BUFFER_SIZE_USERSPACE_OPTION_STR, |
| 736 | arg); |
| 737 | return -1; |
| 738 | } |
| 739 | the_config.event_notifier_buffer_size_userspace = (int) v; |
| 740 | DBG3("Number of event notifier error buffer userspace size to non default: %i", |
| 741 | the_config.event_notifier_buffer_size_userspace); |
| 742 | goto end; |
| 743 | } else if (string_match(optname, "config") || opt == 'f') { |
| 744 | /* This is handled in set_options() thus silent skip. */ |
| 745 | goto end; |
| 746 | } else { |
| 747 | /* Unknown option or other error. |
| 748 | * Error is printed by getopt, just return */ |
| 749 | ret = -1; |
| 750 | } |
| 751 | |
| 752 | end: |
| 753 | if (ret == -EINVAL) { |
| 754 | const char *opt_name = "unknown"; |
| 755 | int i; |
| 756 | |
| 757 | for (i = 0; i < sizeof(long_options) / sizeof(struct option); i++) { |
| 758 | if (opt == long_options[i].val) { |
| 759 | opt_name = long_options[i].name; |
| 760 | break; |
| 761 | } |
| 762 | } |
| 763 | |
| 764 | WARN("Invalid argument provided for option \"%s\", using default value.", opt_name); |
| 765 | } |
| 766 | |
| 767 | return ret; |
| 768 | } |
| 769 | |
| 770 | /* |
| 771 | * config_entry_handler_cb used to handle options read from a config file. |
| 772 | * See config_entry_handler_cb comment in common/config/session-config.h for the |
| 773 | * return value conventions. |
| 774 | */ |
| 775 | static int config_entry_handler(const struct config_entry *entry, |
| 776 | void *unused __attribute__((unused))) |
| 777 | { |
| 778 | int ret = 0, i; |
| 779 | |
| 780 | if (!entry || !entry->name || !entry->value) { |
| 781 | ret = -EINVAL; |
| 782 | goto end; |
| 783 | } |
| 784 | |
| 785 | /* Check if the option is to be ignored */ |
| 786 | for (i = 0; i < sizeof(config_ignore_options) / sizeof(char *); i++) { |
| 787 | if (!strcmp(entry->name, config_ignore_options[i])) { |
| 788 | goto end; |
| 789 | } |
| 790 | } |
| 791 | |
| 792 | for (i = 0; i < (sizeof(long_options) / sizeof(struct option)) - 1; i++) { |
| 793 | /* Ignore if not fully matched. */ |
| 794 | if (strcmp(entry->name, long_options[i].name) != 0) { |
| 795 | continue; |
| 796 | } |
| 797 | |
| 798 | /* |
| 799 | * If the option takes no argument on the command line, we have to |
| 800 | * check if the value is "true". We support non-zero numeric values, |
| 801 | * true, on and yes. |
| 802 | */ |
| 803 | if (!long_options[i].has_arg) { |
| 804 | ret = config_parse_value(entry->value); |
| 805 | if (ret <= 0) { |
| 806 | if (ret) { |
| 807 | WARN("Invalid configuration value \"%s\" for option %s", |
| 808 | entry->value, |
| 809 | entry->name); |
| 810 | } |
| 811 | /* False, skip boolean config option. */ |
| 812 | goto end; |
| 813 | } |
| 814 | } |
| 815 | |
| 816 | ret = set_option(long_options[i].val, entry->value, entry->name); |
| 817 | goto end; |
| 818 | } |
| 819 | |
| 820 | WARN("Unrecognized option \"%s\" in daemon configuration file.", entry->name); |
| 821 | |
| 822 | end: |
| 823 | return ret; |
| 824 | } |
| 825 | |
| 826 | static void print_version() |
| 827 | { |
| 828 | fprintf(stdout, "%s\n", VERSION); |
| 829 | } |
| 830 | |
| 831 | /* |
| 832 | * daemon configuration loading and argument parsing |
| 833 | */ |
| 834 | static int set_options(int argc, char **argv) |
| 835 | { |
| 836 | int ret = 0, c = 0, option_index = 0; |
| 837 | int orig_optopt = optopt, orig_optind = optind; |
| 838 | char *optstring; |
| 839 | char *config_path = nullptr; |
| 840 | |
| 841 | optstring = utils_generate_optstring(long_options, |
| 842 | sizeof(long_options) / sizeof(struct option)); |
| 843 | if (!optstring) { |
| 844 | ret = -ENOMEM; |
| 845 | goto end; |
| 846 | } |
| 847 | |
| 848 | /* Check for the --config option */ |
| 849 | while ((c = getopt_long(argc, argv, optstring, long_options, &option_index)) != -1) { |
| 850 | if (c == '?') { |
| 851 | ret = -EINVAL; |
| 852 | goto end; |
| 853 | } else if (c != 'f') { |
| 854 | /* if not equal to --config option. */ |
| 855 | continue; |
| 856 | } |
| 857 | |
| 858 | if (lttng_is_setuid_setgid()) { |
| 859 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", |
| 860 | "-f, --config"); |
| 861 | } else { |
| 862 | free(config_path); |
| 863 | config_path = utils_expand_path(optarg); |
| 864 | if (!config_path) { |
| 865 | ERR("Failed to resolve path: %s", optarg); |
| 866 | } |
| 867 | } |
| 868 | } |
| 869 | |
| 870 | ret = config_get_section_entries( |
| 871 | config_path, config_section_name, config_entry_handler, nullptr); |
| 872 | if (ret) { |
| 873 | if (ret > 0) { |
| 874 | ERR("Invalid configuration option at line %i", ret); |
| 875 | ret = -1; |
| 876 | } |
| 877 | goto end; |
| 878 | } |
| 879 | |
| 880 | /* Reset getopt's global state */ |
| 881 | optopt = orig_optopt; |
| 882 | optind = orig_optind; |
| 883 | while (true) { |
| 884 | option_index = -1; |
| 885 | /* |
| 886 | * getopt_long() will not set option_index if it encounters a |
| 887 | * short option. |
| 888 | */ |
| 889 | c = getopt_long(argc, argv, optstring, long_options, &option_index); |
| 890 | if (c == -1) { |
| 891 | break; |
| 892 | } |
| 893 | |
| 894 | /* |
| 895 | * Pass NULL as the long option name if popt left the index |
| 896 | * unset. |
| 897 | */ |
| 898 | ret = set_option( |
| 899 | c, optarg, option_index < 0 ? nullptr : long_options[option_index].name); |
| 900 | if (ret < 0) { |
| 901 | break; |
| 902 | } |
| 903 | } |
| 904 | |
| 905 | end: |
| 906 | free(config_path); |
| 907 | free(optstring); |
| 908 | return ret; |
| 909 | } |
| 910 | |
| 911 | /* |
| 912 | * Create lockfile using the rundir and return its fd. |
| 913 | */ |
| 914 | static int create_lockfile() |
| 915 | { |
| 916 | return utils_create_lock_file(the_config.lock_file_path.value); |
| 917 | } |
| 918 | |
| 919 | /* |
| 920 | * Check if the global socket is available, and if a daemon is answering at the |
| 921 | * other side. If yes, error is returned. |
| 922 | * |
| 923 | * Also attempts to create and hold the lock file. |
| 924 | */ |
| 925 | static int check_existing_daemon() |
| 926 | { |
| 927 | int ret = 0; |
| 928 | |
| 929 | /* Is there anybody out there ? */ |
| 930 | if (lttng_session_daemon_alive()) { |
| 931 | ret = -EEXIST; |
| 932 | goto end; |
| 933 | } |
| 934 | |
| 935 | lockfile_fd = create_lockfile(); |
| 936 | if (lockfile_fd < 0) { |
| 937 | ret = -EEXIST; |
| 938 | goto end; |
| 939 | } |
| 940 | end: |
| 941 | return ret; |
| 942 | } |
| 943 | |
| 944 | static void sessiond_cleanup_lock_file() |
| 945 | { |
| 946 | int ret; |
| 947 | |
| 948 | /* |
| 949 | * Cleanup lock file by deleting it and finaly closing it which will |
| 950 | * release the file system lock. |
| 951 | */ |
| 952 | if (lockfile_fd >= 0) { |
| 953 | ret = remove(the_config.lock_file_path.value); |
| 954 | if (ret < 0) { |
| 955 | PERROR("remove lock file"); |
| 956 | } |
| 957 | ret = close(lockfile_fd); |
| 958 | if (ret < 0) { |
| 959 | PERROR("close lock file"); |
| 960 | } |
| 961 | } |
| 962 | } |
| 963 | |
| 964 | /* |
| 965 | * Set the tracing group gid onto the client socket. |
| 966 | * |
| 967 | * Race window between mkdir and chown is OK because we are going from more |
| 968 | * permissive (root.root) to less permissive (root.tracing). |
| 969 | */ |
| 970 | static int set_permissions(char *rundir) |
| 971 | { |
| 972 | int ret; |
| 973 | gid_t gid; |
| 974 | |
| 975 | ret = utils_get_group_id(the_config.tracing_group_name.value, true, &gid); |
| 976 | if (ret) { |
| 977 | /* Default to root group. */ |
| 978 | gid = 0; |
| 979 | } |
| 980 | |
| 981 | /* Set lttng run dir */ |
| 982 | ret = chown(rundir, 0, gid); |
| 983 | if (ret < 0) { |
| 984 | ERR("Unable to set group on %s", rundir); |
| 985 | PERROR("chown"); |
| 986 | } |
| 987 | |
| 988 | /* |
| 989 | * Ensure all applications and tracing group can search the run |
| 990 | * dir. Allow everyone to read the directory, since it does not |
| 991 | * buy us anything to hide its content. |
| 992 | */ |
| 993 | ret = chmod(rundir, S_IRWXU | S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH); |
| 994 | if (ret < 0) { |
| 995 | ERR("Unable to set permissions on %s", rundir); |
| 996 | PERROR("chmod"); |
| 997 | } |
| 998 | |
| 999 | /* lttng client socket path */ |
| 1000 | ret = chown(the_config.client_unix_sock_path.value, 0, gid); |
| 1001 | if (ret < 0) { |
| 1002 | ERR("Unable to set group on %s", the_config.client_unix_sock_path.value); |
| 1003 | PERROR("chown"); |
| 1004 | } |
| 1005 | |
| 1006 | /* kconsumer error socket path */ |
| 1007 | ret = chown(the_kconsumer_data.err_unix_sock_path, 0, 0); |
| 1008 | if (ret < 0) { |
| 1009 | ERR("Unable to set group on %s", the_kconsumer_data.err_unix_sock_path); |
| 1010 | PERROR("chown"); |
| 1011 | } |
| 1012 | |
| 1013 | /* 64-bit ustconsumer error socket path */ |
| 1014 | ret = chown(the_ustconsumer64_data.err_unix_sock_path, 0, 0); |
| 1015 | if (ret < 0) { |
| 1016 | ERR("Unable to set group on %s", the_ustconsumer64_data.err_unix_sock_path); |
| 1017 | PERROR("chown"); |
| 1018 | } |
| 1019 | |
| 1020 | /* 32-bit ustconsumer compat32 error socket path */ |
| 1021 | ret = chown(the_ustconsumer32_data.err_unix_sock_path, 0, 0); |
| 1022 | if (ret < 0) { |
| 1023 | ERR("Unable to set group on %s", the_ustconsumer32_data.err_unix_sock_path); |
| 1024 | PERROR("chown"); |
| 1025 | } |
| 1026 | |
| 1027 | DBG("All permissions are set"); |
| 1028 | |
| 1029 | return ret; |
| 1030 | } |
| 1031 | |
| 1032 | /* |
| 1033 | * Create the lttng run directory needed for all global sockets and pipe. |
| 1034 | */ |
| 1035 | static int create_lttng_rundir() |
| 1036 | { |
| 1037 | int ret; |
| 1038 | |
| 1039 | DBG3("Creating LTTng run directory: %s", the_config.rundir.value); |
| 1040 | |
| 1041 | ret = mkdir(the_config.rundir.value, S_IRWXU); |
| 1042 | if (ret < 0) { |
| 1043 | if (errno != EEXIST) { |
| 1044 | ERR("Unable to create %s", the_config.rundir.value); |
| 1045 | goto error; |
| 1046 | } else { |
| 1047 | ret = 0; |
| 1048 | } |
| 1049 | } |
| 1050 | |
| 1051 | error: |
| 1052 | return ret; |
| 1053 | } |
| 1054 | |
| 1055 | /* |
| 1056 | * Setup sockets and directory needed by the consumerds' communication with the |
| 1057 | * session daemon. |
| 1058 | */ |
| 1059 | static int set_consumer_sockets(struct consumer_data *consumer_data) |
| 1060 | { |
| 1061 | int ret; |
| 1062 | char *path = nullptr; |
| 1063 | |
| 1064 | switch (consumer_data->type) { |
| 1065 | case LTTNG_CONSUMER_KERNEL: |
| 1066 | path = the_config.kconsumerd_path.value; |
| 1067 | break; |
| 1068 | case LTTNG_CONSUMER64_UST: |
| 1069 | path = the_config.consumerd64_path.value; |
| 1070 | break; |
| 1071 | case LTTNG_CONSUMER32_UST: |
| 1072 | path = the_config.consumerd32_path.value; |
| 1073 | break; |
| 1074 | default: |
| 1075 | ERR("Consumer type unknown"); |
| 1076 | ret = -EINVAL; |
| 1077 | goto error; |
| 1078 | } |
| 1079 | LTTNG_ASSERT(path); |
| 1080 | |
| 1081 | DBG2("Creating consumer directory: %s", path); |
| 1082 | |
| 1083 | ret = mkdir(path, S_IRWXU | S_IRGRP | S_IXGRP); |
| 1084 | if (ret < 0 && errno != EEXIST) { |
| 1085 | PERROR("mkdir"); |
| 1086 | ERR("Failed to create %s", path); |
| 1087 | goto error; |
| 1088 | } |
| 1089 | if (is_root) { |
| 1090 | gid_t gid; |
| 1091 | |
| 1092 | ret = utils_get_group_id(the_config.tracing_group_name.value, true, &gid); |
| 1093 | if (ret) { |
| 1094 | /* Default to root group. */ |
| 1095 | gid = 0; |
| 1096 | } |
| 1097 | |
| 1098 | ret = chown(path, 0, gid); |
| 1099 | if (ret < 0) { |
| 1100 | ERR("Unable to set group on %s", path); |
| 1101 | PERROR("chown"); |
| 1102 | goto error; |
| 1103 | } |
| 1104 | } |
| 1105 | |
| 1106 | /* Create the consumerd error unix socket */ |
| 1107 | consumer_data->err_sock = lttcomm_create_unix_sock(consumer_data->err_unix_sock_path); |
| 1108 | if (consumer_data->err_sock < 0) { |
| 1109 | ERR("Create unix sock failed: %s", consumer_data->err_unix_sock_path); |
| 1110 | ret = -1; |
| 1111 | goto error; |
| 1112 | } |
| 1113 | |
| 1114 | /* |
| 1115 | * Set the CLOEXEC flag. Return code is useless because either way, the |
| 1116 | * show must go on. |
| 1117 | */ |
| 1118 | ret = utils_set_fd_cloexec(consumer_data->err_sock); |
| 1119 | if (ret < 0) { |
| 1120 | PERROR("utils_set_fd_cloexec"); |
| 1121 | /* continue anyway */ |
| 1122 | } |
| 1123 | |
| 1124 | /* File permission MUST be 660 */ |
| 1125 | ret = chmod(consumer_data->err_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); |
| 1126 | if (ret < 0) { |
| 1127 | ERR("Set file permissions failed: %s", consumer_data->err_unix_sock_path); |
| 1128 | PERROR("chmod"); |
| 1129 | goto error; |
| 1130 | } |
| 1131 | |
| 1132 | error: |
| 1133 | return ret; |
| 1134 | } |
| 1135 | |
| 1136 | /* |
| 1137 | * Signal handler for the daemon |
| 1138 | * |
| 1139 | * Simply stop all worker threads, leaving main() return gracefully after |
| 1140 | * joining all threads and calling cleanup(). |
| 1141 | */ |
| 1142 | static void sighandler(int sig, siginfo_t *siginfo, void *arg __attribute__((unused))) |
| 1143 | { |
| 1144 | switch (sig) { |
| 1145 | case SIGINT: |
| 1146 | DBG("SIGINT caught"); |
| 1147 | notify_main_quit_pipe(); |
| 1148 | break; |
| 1149 | case SIGTERM: |
| 1150 | DBG("SIGTERM caught"); |
| 1151 | notify_main_quit_pipe(); |
| 1152 | break; |
| 1153 | case SIGUSR1: |
| 1154 | CMM_STORE_SHARED(recv_child_signal, 1); |
| 1155 | break; |
| 1156 | case SIGBUS: |
| 1157 | { |
| 1158 | int write_ret; |
| 1159 | const char msg[] = "Received SIGBUS, aborting program.\n"; |
| 1160 | |
| 1161 | lttng_ust_handle_sigbus(siginfo->si_addr); |
| 1162 | /* |
| 1163 | * If ustctl did not catch this signal (triggering a |
| 1164 | * siglongjmp), abort the program. Otherwise, the execution |
| 1165 | * will resume from the ust-ctl call which caused this error. |
| 1166 | * |
| 1167 | * The return value is ignored since the program aborts anyhow. |
| 1168 | */ |
| 1169 | write_ret = write(STDERR_FILENO, msg, sizeof(msg)); |
| 1170 | (void) write_ret; |
| 1171 | abort(); |
| 1172 | } |
| 1173 | default: |
| 1174 | break; |
| 1175 | } |
| 1176 | } |
| 1177 | |
| 1178 | /* |
| 1179 | * Setup signal handler for : |
| 1180 | * SIGINT, SIGTERM, SIGPIPE |
| 1181 | */ |
| 1182 | static int set_signal_handler() |
| 1183 | { |
| 1184 | int ret = 0; |
| 1185 | struct sigaction sa; |
| 1186 | sigset_t sigset; |
| 1187 | |
| 1188 | if ((ret = sigemptyset(&sigset)) < 0) { |
| 1189 | PERROR("sigemptyset"); |
| 1190 | return ret; |
| 1191 | } |
| 1192 | |
| 1193 | sa.sa_mask = sigset; |
| 1194 | sa.sa_flags = SA_SIGINFO; |
| 1195 | |
| 1196 | sa.sa_sigaction = sighandler; |
| 1197 | if ((ret = sigaction(SIGTERM, &sa, nullptr)) < 0) { |
| 1198 | PERROR("sigaction"); |
| 1199 | return ret; |
| 1200 | } |
| 1201 | |
| 1202 | if ((ret = sigaction(SIGINT, &sa, nullptr)) < 0) { |
| 1203 | PERROR("sigaction"); |
| 1204 | return ret; |
| 1205 | } |
| 1206 | |
| 1207 | if ((ret = sigaction(SIGUSR1, &sa, nullptr)) < 0) { |
| 1208 | PERROR("sigaction"); |
| 1209 | return ret; |
| 1210 | } |
| 1211 | |
| 1212 | if ((ret = sigaction(SIGBUS, &sa, nullptr)) < 0) { |
| 1213 | PERROR("sigaction"); |
| 1214 | return ret; |
| 1215 | } |
| 1216 | |
| 1217 | sa.sa_flags = 0; |
| 1218 | sa.sa_handler = SIG_IGN; |
| 1219 | if ((ret = sigaction(SIGPIPE, &sa, nullptr)) < 0) { |
| 1220 | PERROR("sigaction"); |
| 1221 | return ret; |
| 1222 | } |
| 1223 | |
| 1224 | DBG("Signal handler set for SIGTERM, SIGUSR1, SIGPIPE, SIGINT, and SIGBUS"); |
| 1225 | |
| 1226 | return ret; |
| 1227 | } |
| 1228 | |
| 1229 | /* |
| 1230 | * Set open files limit to unlimited. This daemon can open a large number of |
| 1231 | * file descriptors in order to consume multiple kernel traces. |
| 1232 | */ |
| 1233 | static void set_ulimit() |
| 1234 | { |
| 1235 | int ret; |
| 1236 | struct rlimit lim; |
| 1237 | |
| 1238 | /* The kernel does not allow an infinite limit for open files */ |
| 1239 | lim.rlim_cur = 65535; |
| 1240 | lim.rlim_max = 65535; |
| 1241 | |
| 1242 | ret = setrlimit(RLIMIT_NOFILE, &lim); |
| 1243 | if (ret < 0) { |
| 1244 | PERROR("failed to set open files limit"); |
| 1245 | } |
| 1246 | } |
| 1247 | |
| 1248 | static int write_pidfile() |
| 1249 | { |
| 1250 | return utils_create_pid_file(getpid(), the_config.pid_file_path.value); |
| 1251 | } |
| 1252 | |
| 1253 | static int set_clock_plugin_env() |
| 1254 | { |
| 1255 | int ret = 0; |
| 1256 | char *env_value = nullptr; |
| 1257 | |
| 1258 | if (!the_config.lttng_ust_clock_plugin.value) { |
| 1259 | goto end; |
| 1260 | } |
| 1261 | |
| 1262 | ret = asprintf( |
| 1263 | &env_value, "LTTNG_UST_CLOCK_PLUGIN=%s", the_config.lttng_ust_clock_plugin.value); |
| 1264 | if (ret < 0) { |
| 1265 | PERROR("asprintf"); |
| 1266 | goto end; |
| 1267 | } |
| 1268 | |
| 1269 | ret = putenv(env_value); |
| 1270 | if (ret) { |
| 1271 | free(env_value); |
| 1272 | PERROR("putenv of LTTNG_UST_CLOCK_PLUGIN"); |
| 1273 | goto end; |
| 1274 | } |
| 1275 | |
| 1276 | DBG("Updated LTTNG_UST_CLOCK_PLUGIN environment variable to \"%s\"", |
| 1277 | the_config.lttng_ust_clock_plugin.value); |
| 1278 | end: |
| 1279 | return ret; |
| 1280 | } |
| 1281 | |
| 1282 | static void destroy_all_sessions_and_wait() |
| 1283 | { |
| 1284 | struct ltt_session *session, *tmp; |
| 1285 | struct ltt_session_list *session_list; |
| 1286 | |
| 1287 | session_list = session_get_list(); |
| 1288 | DBG("Initiating destruction of all sessions"); |
| 1289 | |
| 1290 | if (!session_list) { |
| 1291 | return; |
| 1292 | } |
| 1293 | |
| 1294 | session_lock_list(); |
| 1295 | /* Initiate the destruction of all sessions. */ |
| 1296 | cds_list_for_each_entry_safe (session, tmp, &session_list->head, list) { |
| 1297 | if (!session_get(session)) { |
| 1298 | continue; |
| 1299 | } |
| 1300 | |
| 1301 | session_lock(session); |
| 1302 | if (session->destroyed) { |
| 1303 | goto unlock_session; |
| 1304 | } |
| 1305 | (void) cmd_stop_trace(session); |
| 1306 | (void) cmd_destroy_session(session, the_notification_thread_handle, nullptr); |
| 1307 | unlock_session: |
| 1308 | session_unlock(session); |
| 1309 | session_put(session); |
| 1310 | } |
| 1311 | session_unlock_list(); |
| 1312 | |
| 1313 | /* Wait for the destruction of all sessions to complete. */ |
| 1314 | DBG("Waiting for the destruction of all sessions to complete"); |
| 1315 | session_list_wait_empty(); |
| 1316 | DBG("Destruction of all sessions completed"); |
| 1317 | } |
| 1318 | |
| 1319 | static void unregister_all_triggers() |
| 1320 | { |
| 1321 | enum lttng_error_code ret_code; |
| 1322 | enum lttng_trigger_status trigger_status; |
| 1323 | struct lttng_triggers *triggers = nullptr; |
| 1324 | unsigned int trigger_count, i; |
| 1325 | const struct lttng_credentials creds = { |
| 1326 | .uid = LTTNG_OPTIONAL_INIT_VALUE(0), |
| 1327 | .gid = LTTNG_OPTIONAL_INIT_UNSET, |
| 1328 | }; |
| 1329 | |
| 1330 | DBG("Unregistering all triggers"); |
| 1331 | |
| 1332 | /* |
| 1333 | * List all triggers as "root" since we wish to unregister all triggers. |
| 1334 | */ |
| 1335 | ret_code = notification_thread_command_list_triggers( |
| 1336 | the_notification_thread_handle, creds.uid.value, &triggers); |
| 1337 | if (ret_code != LTTNG_OK) { |
| 1338 | ERR("Failed to list triggers while unregistering all triggers"); |
| 1339 | goto end; |
| 1340 | } |
| 1341 | |
| 1342 | trigger_status = lttng_triggers_get_count(triggers, &trigger_count); |
| 1343 | LTTNG_ASSERT(trigger_status == LTTNG_TRIGGER_STATUS_OK); |
| 1344 | |
| 1345 | for (i = 0; i < trigger_count; i++) { |
| 1346 | uid_t trigger_owner; |
| 1347 | const char *trigger_name; |
| 1348 | const struct lttng_trigger *trigger = lttng_triggers_get_at_index(triggers, i); |
| 1349 | |
| 1350 | LTTNG_ASSERT(trigger); |
| 1351 | |
| 1352 | trigger_status = lttng_trigger_get_owner_uid(trigger, &trigger_owner); |
| 1353 | LTTNG_ASSERT(trigger_status == LTTNG_TRIGGER_STATUS_OK); |
| 1354 | |
| 1355 | trigger_status = lttng_trigger_get_name(trigger, &trigger_name); |
| 1356 | trigger_name = trigger_status == LTTNG_TRIGGER_STATUS_OK ? trigger_name : |
| 1357 | "(anonymous)"; |
| 1358 | |
| 1359 | DBG("Unregistering trigger: trigger owner uid = %d, trigger name = '%s'", |
| 1360 | (int) trigger_owner, |
| 1361 | trigger_name); |
| 1362 | |
| 1363 | ret_code = cmd_unregister_trigger(&creds, trigger, the_notification_thread_handle); |
| 1364 | if (ret_code != LTTNG_OK) { |
| 1365 | ERR("Failed to unregister trigger: trigger owner uid = %d, trigger name = '%s', error: '%s'", |
| 1366 | (int) trigger_owner, |
| 1367 | trigger_name, |
| 1368 | lttng_strerror(-ret_code)); |
| 1369 | /* Continue to unregister the remaining triggers. */ |
| 1370 | } |
| 1371 | } |
| 1372 | end: |
| 1373 | lttng_triggers_destroy(triggers); |
| 1374 | } |
| 1375 | |
| 1376 | static int run_as_worker_post_fork_cleanup(void *data) |
| 1377 | { |
| 1378 | struct sessiond_config *sessiond_config = (struct sessiond_config *) data; |
| 1379 | |
| 1380 | sessiond_config_fini(sessiond_config); |
| 1381 | return 0; |
| 1382 | } |
| 1383 | |
| 1384 | static int launch_run_as_worker(const char *procname) |
| 1385 | { |
| 1386 | /* |
| 1387 | * Clean-up before forking the run-as worker. Any dynamically |
| 1388 | * allocated memory of which the worker is not aware will |
| 1389 | * be leaked as the process forks a run-as worker (and performs |
| 1390 | * no exec*()). The same would apply to any opened fd. |
| 1391 | */ |
| 1392 | return run_as_create_worker(procname, run_as_worker_post_fork_cleanup, &the_config); |
| 1393 | } |
| 1394 | |
| 1395 | static void sessiond_uuid_log() |
| 1396 | { |
| 1397 | char uuid_str[LTTNG_UUID_STR_LEN]; |
| 1398 | |
| 1399 | lttng_uuid_to_str(the_sessiond_uuid, uuid_str); |
| 1400 | DBG("Starting lttng-sessiond {%s}", uuid_str); |
| 1401 | } |
| 1402 | |
| 1403 | /* |
| 1404 | * main |
| 1405 | */ |
| 1406 | int main(int argc, char **argv) |
| 1407 | { |
| 1408 | int ret = 0, retval = 0; |
| 1409 | const char *env_app_timeout; |
| 1410 | struct lttng_pipe *ust32_channel_monitor_pipe = nullptr, |
| 1411 | *ust64_channel_monitor_pipe = nullptr, |
| 1412 | *kernel_channel_monitor_pipe = nullptr; |
| 1413 | struct timer_thread_parameters timer_thread_parameters; |
| 1414 | /* Rotation thread handle. */ |
| 1415 | struct rotation_thread_handle *rotation_thread_handle = nullptr; |
| 1416 | /* Queue of rotation jobs populated by the sessiond-timer. */ |
| 1417 | struct rotation_thread_timer_queue *rotation_timer_queue = nullptr; |
| 1418 | struct lttng_thread *client_thread = nullptr; |
| 1419 | struct lttng_thread *notification_thread = nullptr; |
| 1420 | struct lttng_thread *register_apps_thread = nullptr; |
| 1421 | enum event_notifier_error_accounting_status event_notifier_error_accounting_status; |
| 1422 | |
| 1423 | logger_set_thread_name("Main", false); |
| 1424 | init_kernel_workarounds(); |
| 1425 | |
| 1426 | rcu_register_thread(); |
| 1427 | |
| 1428 | if (set_signal_handler()) { |
| 1429 | retval = -1; |
| 1430 | goto exit_set_signal_handler; |
| 1431 | } |
| 1432 | |
| 1433 | if (timer_signal_init()) { |
| 1434 | retval = -1; |
| 1435 | goto exit_set_signal_handler; |
| 1436 | } |
| 1437 | |
| 1438 | the_page_size = sysconf(_SC_PAGE_SIZE); |
| 1439 | if (the_page_size < 0) { |
| 1440 | PERROR("sysconf _SC_PAGE_SIZE"); |
| 1441 | the_page_size = LONG_MAX; |
| 1442 | WARN("Fallback page size to %ld", the_page_size); |
| 1443 | } |
| 1444 | |
| 1445 | ret = sessiond_config_init(&the_config); |
| 1446 | if (ret) { |
| 1447 | retval = -1; |
| 1448 | goto exit_set_signal_handler; |
| 1449 | } |
| 1450 | |
| 1451 | /* |
| 1452 | * Init config from environment variables. |
| 1453 | * Command line option override env configuration per-doc. Do env first. |
| 1454 | */ |
| 1455 | sessiond_config_apply_env_config(&the_config); |
| 1456 | |
| 1457 | /* |
| 1458 | * Parse arguments and load the daemon configuration file. |
| 1459 | * |
| 1460 | * We have an exit_options exit path to free memory reserved by |
| 1461 | * set_options. |
| 1462 | */ |
| 1463 | progname = argv[0]; |
| 1464 | if (set_options(argc, argv)) { |
| 1465 | retval = -1; |
| 1466 | goto exit_options; |
| 1467 | } |
| 1468 | |
| 1469 | /* |
| 1470 | * Resolve all paths received as arguments, configuration option, or |
| 1471 | * through environment variable as absolute paths. This is necessary |
| 1472 | * since daemonizing causes the sessiond's current working directory |
| 1473 | * to '/'. |
| 1474 | */ |
| 1475 | ret = sessiond_config_resolve_paths(&the_config); |
| 1476 | if (ret) { |
| 1477 | goto exit_options; |
| 1478 | } |
| 1479 | |
| 1480 | /* Apply config. */ |
| 1481 | lttng_opt_verbose = the_config.verbose; |
| 1482 | lttng_opt_quiet = the_config.quiet; |
| 1483 | the_kconsumer_data.err_unix_sock_path = the_config.kconsumerd_err_unix_sock_path.value; |
| 1484 | the_kconsumer_data.cmd_unix_sock_path = the_config.kconsumerd_cmd_unix_sock_path.value; |
| 1485 | the_ustconsumer32_data.err_unix_sock_path = the_config.consumerd32_err_unix_sock_path.value; |
| 1486 | the_ustconsumer32_data.cmd_unix_sock_path = the_config.consumerd32_cmd_unix_sock_path.value; |
| 1487 | the_ustconsumer64_data.err_unix_sock_path = the_config.consumerd64_err_unix_sock_path.value; |
| 1488 | the_ustconsumer64_data.cmd_unix_sock_path = the_config.consumerd64_cmd_unix_sock_path.value; |
| 1489 | set_clock_plugin_env(); |
| 1490 | |
| 1491 | sessiond_config_log(&the_config); |
| 1492 | sessiond_uuid_log(); |
| 1493 | lttng::logging::log_system_information(PRINT_DBG); |
| 1494 | |
| 1495 | if (opt_print_version) { |
| 1496 | print_version(); |
| 1497 | retval = 0; |
| 1498 | goto exit_options; |
| 1499 | } |
| 1500 | |
| 1501 | if (create_lttng_rundir()) { |
| 1502 | retval = -1; |
| 1503 | goto exit_options; |
| 1504 | } |
| 1505 | |
| 1506 | /* Abort launch if a session daemon is already running. */ |
| 1507 | if (check_existing_daemon()) { |
| 1508 | ERR("A session daemon is already running."); |
| 1509 | retval = -1; |
| 1510 | goto exit_options; |
| 1511 | } |
| 1512 | |
| 1513 | /* Daemonize */ |
| 1514 | if (the_config.daemonize || the_config.background) { |
| 1515 | int i; |
| 1516 | |
| 1517 | ret = lttng_daemonize(&the_child_ppid, &recv_child_signal, !the_config.background); |
| 1518 | if (ret < 0) { |
| 1519 | retval = -1; |
| 1520 | goto exit_options; |
| 1521 | } |
| 1522 | |
| 1523 | /* |
| 1524 | * We are in the child. Make sure all other file descriptors are |
| 1525 | * closed, in case we are called with more opened file |
| 1526 | * descriptors than the standard ones and the lock file. |
| 1527 | */ |
| 1528 | for (i = 3; i < sysconf(_SC_OPEN_MAX); i++) { |
| 1529 | if (i == lockfile_fd) { |
| 1530 | continue; |
| 1531 | } |
| 1532 | (void) close(i); |
| 1533 | } |
| 1534 | } |
| 1535 | |
| 1536 | if (launch_run_as_worker(argv[0]) < 0) { |
| 1537 | goto exit_create_run_as_worker_cleanup; |
| 1538 | } |
| 1539 | |
| 1540 | /* |
| 1541 | * Starting from here, we can create threads. This needs to be after |
| 1542 | * lttng_daemonize due to RCU. |
| 1543 | */ |
| 1544 | |
| 1545 | /* |
| 1546 | * Initialize the health check subsystem. This call should set the |
| 1547 | * appropriate time values. |
| 1548 | */ |
| 1549 | the_health_sessiond = health_app_create(NR_HEALTH_SESSIOND_TYPES); |
| 1550 | if (!the_health_sessiond) { |
| 1551 | PERROR("health_app_create error"); |
| 1552 | retval = -1; |
| 1553 | goto stop_threads; |
| 1554 | } |
| 1555 | |
| 1556 | /* Create main quit pipe */ |
| 1557 | if (sessiond_init_main_quit_pipe()) { |
| 1558 | retval = -1; |
| 1559 | goto stop_threads; |
| 1560 | } |
| 1561 | |
| 1562 | /* Check if daemon is UID = 0 */ |
| 1563 | is_root = !getuid(); |
| 1564 | if (is_root) { |
| 1565 | /* Create global run dir with root access */ |
| 1566 | |
| 1567 | kernel_channel_monitor_pipe = lttng_pipe_open(0); |
| 1568 | if (!kernel_channel_monitor_pipe) { |
| 1569 | ERR("Failed to create kernel consumer channel monitor pipe"); |
| 1570 | retval = -1; |
| 1571 | goto stop_threads; |
| 1572 | } |
| 1573 | the_kconsumer_data.channel_monitor_pipe = |
| 1574 | lttng_pipe_release_writefd(kernel_channel_monitor_pipe); |
| 1575 | if (the_kconsumer_data.channel_monitor_pipe < 0) { |
| 1576 | retval = -1; |
| 1577 | goto stop_threads; |
| 1578 | } |
| 1579 | } |
| 1580 | |
| 1581 | /* Set consumer initial state */ |
| 1582 | the_kernel_consumerd_state = CONSUMER_STOPPED; |
| 1583 | the_ust_consumerd_state = CONSUMER_STOPPED; |
| 1584 | |
| 1585 | ust32_channel_monitor_pipe = lttng_pipe_open(0); |
| 1586 | if (!ust32_channel_monitor_pipe) { |
| 1587 | ERR("Failed to create 32-bit user space consumer channel monitor pipe"); |
| 1588 | retval = -1; |
| 1589 | goto stop_threads; |
| 1590 | } |
| 1591 | the_ustconsumer32_data.channel_monitor_pipe = |
| 1592 | lttng_pipe_release_writefd(ust32_channel_monitor_pipe); |
| 1593 | if (the_ustconsumer32_data.channel_monitor_pipe < 0) { |
| 1594 | retval = -1; |
| 1595 | goto stop_threads; |
| 1596 | } |
| 1597 | |
| 1598 | /* |
| 1599 | * The rotation_thread_timer_queue structure is shared between the |
| 1600 | * sessiond timer thread and the rotation thread. The main thread keeps |
| 1601 | * its ownership and destroys it when both threads have been joined. |
| 1602 | */ |
| 1603 | rotation_timer_queue = rotation_thread_timer_queue_create(); |
| 1604 | if (!rotation_timer_queue) { |
| 1605 | retval = -1; |
| 1606 | goto stop_threads; |
| 1607 | } |
| 1608 | timer_thread_parameters.rotation_thread_job_queue = rotation_timer_queue; |
| 1609 | |
| 1610 | ust64_channel_monitor_pipe = lttng_pipe_open(0); |
| 1611 | if (!ust64_channel_monitor_pipe) { |
| 1612 | ERR("Failed to create 64-bit user space consumer channel monitor pipe"); |
| 1613 | retval = -1; |
| 1614 | goto stop_threads; |
| 1615 | } |
| 1616 | the_ustconsumer64_data.channel_monitor_pipe = |
| 1617 | lttng_pipe_release_writefd(ust64_channel_monitor_pipe); |
| 1618 | if (the_ustconsumer64_data.channel_monitor_pipe < 0) { |
| 1619 | retval = -1; |
| 1620 | goto stop_threads; |
| 1621 | } |
| 1622 | |
| 1623 | /* |
| 1624 | * Init UST app hash table. Alloc hash table before this point since |
| 1625 | * cleanup() can get called after that point. |
| 1626 | */ |
| 1627 | if (ust_app_ht_alloc()) { |
| 1628 | ERR("Failed to allocate UST app hash table"); |
| 1629 | retval = -1; |
| 1630 | goto stop_threads; |
| 1631 | } |
| 1632 | |
| 1633 | event_notifier_error_accounting_status = event_notifier_error_accounting_init( |
| 1634 | the_config.event_notifier_buffer_size_kernel, |
| 1635 | the_config.event_notifier_buffer_size_userspace); |
| 1636 | if (event_notifier_error_accounting_status != EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_OK) { |
| 1637 | ERR("Failed to initialize event notifier error accounting system"); |
| 1638 | retval = -1; |
| 1639 | goto stop_threads; |
| 1640 | } |
| 1641 | |
| 1642 | /* |
| 1643 | * Initialize agent app hash table. We allocate the hash table here |
| 1644 | * since cleanup() can get called after this point. |
| 1645 | */ |
| 1646 | if (agent_app_ht_alloc()) { |
| 1647 | ERR("Failed to allocate Agent app hash table"); |
| 1648 | retval = -1; |
| 1649 | goto stop_threads; |
| 1650 | } |
| 1651 | |
| 1652 | if (agent_by_event_notifier_domain_ht_create()) { |
| 1653 | ERR("Failed to allocate per-event notifier domain agent hash table"); |
| 1654 | retval = -1; |
| 1655 | goto stop_threads; |
| 1656 | } |
| 1657 | /* |
| 1658 | * These actions must be executed as root. We do that *after* setting up |
| 1659 | * the sockets path because we MUST make the check for another daemon using |
| 1660 | * those paths *before* trying to set the kernel consumer sockets and init |
| 1661 | * kernel tracer. |
| 1662 | */ |
| 1663 | if (is_root) { |
| 1664 | if (set_consumer_sockets(&the_kconsumer_data)) { |
| 1665 | retval = -1; |
| 1666 | goto stop_threads; |
| 1667 | } |
| 1668 | |
| 1669 | /* Setup kernel tracer */ |
| 1670 | if (!the_config.no_kernel) { |
| 1671 | init_kernel_tracer(); |
| 1672 | } |
| 1673 | |
| 1674 | /* Set ulimit for open files */ |
| 1675 | set_ulimit(); |
| 1676 | } |
| 1677 | /* init lttng_fd tracking must be done after set_ulimit. */ |
| 1678 | lttng_fd_init(); |
| 1679 | |
| 1680 | if (set_consumer_sockets(&the_ustconsumer64_data)) { |
| 1681 | retval = -1; |
| 1682 | goto stop_threads; |
| 1683 | } |
| 1684 | |
| 1685 | if (set_consumer_sockets(&the_ustconsumer32_data)) { |
| 1686 | retval = -1; |
| 1687 | goto stop_threads; |
| 1688 | } |
| 1689 | |
| 1690 | /* Get parent pid if -S, --sig-parent is specified. */ |
| 1691 | if (the_config.sig_parent) { |
| 1692 | the_ppid = getppid(); |
| 1693 | } |
| 1694 | |
| 1695 | /* Setup the kernel pipe for waking up the kernel thread */ |
| 1696 | if (is_root && !the_config.no_kernel) { |
| 1697 | if (utils_create_pipe_cloexec(the_kernel_poll_pipe)) { |
| 1698 | retval = -1; |
| 1699 | goto stop_threads; |
| 1700 | } |
| 1701 | } |
| 1702 | |
| 1703 | /* Setup the thread apps communication pipe. */ |
| 1704 | if (utils_create_pipe_cloexec(apps_cmd_pipe)) { |
| 1705 | retval = -1; |
| 1706 | goto stop_threads; |
| 1707 | } |
| 1708 | |
| 1709 | /* Setup the thread apps notify communication pipe. */ |
| 1710 | if (utils_create_pipe_cloexec(apps_cmd_notify_pipe)) { |
| 1711 | retval = -1; |
| 1712 | goto stop_threads; |
| 1713 | } |
| 1714 | |
| 1715 | /* Initialize global buffer per UID and PID registry. */ |
| 1716 | buffer_reg_init_uid_registry(); |
| 1717 | buffer_reg_init_pid_registry(); |
| 1718 | |
| 1719 | /* Init UST command queue. */ |
| 1720 | cds_wfcq_init(&ust_cmd_queue.head, &ust_cmd_queue.tail); |
| 1721 | |
| 1722 | cmd_init(); |
| 1723 | |
| 1724 | /* Check for the application socket timeout env variable. */ |
| 1725 | env_app_timeout = getenv(DEFAULT_APP_SOCKET_TIMEOUT_ENV); |
| 1726 | if (env_app_timeout) { |
| 1727 | the_config.app_socket_timeout = atoi(env_app_timeout); |
| 1728 | } else { |
| 1729 | the_config.app_socket_timeout = DEFAULT_APP_SOCKET_RW_TIMEOUT; |
| 1730 | } |
| 1731 | |
| 1732 | ret = write_pidfile(); |
| 1733 | if (ret) { |
| 1734 | ERR("Error in write_pidfile"); |
| 1735 | retval = -1; |
| 1736 | goto stop_threads; |
| 1737 | } |
| 1738 | |
| 1739 | /* Initialize communication library */ |
| 1740 | lttcomm_init(); |
| 1741 | /* Initialize TCP timeout values */ |
| 1742 | lttcomm_inet_init(); |
| 1743 | |
| 1744 | /* Create health-check thread. */ |
| 1745 | if (!launch_health_management_thread()) { |
| 1746 | retval = -1; |
| 1747 | goto stop_threads; |
| 1748 | } |
| 1749 | |
| 1750 | /* notification_thread_data acquires the pipes' read side. */ |
| 1751 | the_notification_thread_handle = |
| 1752 | notification_thread_handle_create(ust32_channel_monitor_pipe, |
| 1753 | ust64_channel_monitor_pipe, |
| 1754 | kernel_channel_monitor_pipe); |
| 1755 | if (!the_notification_thread_handle) { |
| 1756 | retval = -1; |
| 1757 | ERR("Failed to create notification thread shared data"); |
| 1758 | goto stop_threads; |
| 1759 | } |
| 1760 | |
| 1761 | /* Create notification thread. */ |
| 1762 | notification_thread = launch_notification_thread(the_notification_thread_handle); |
| 1763 | if (!notification_thread) { |
| 1764 | retval = -1; |
| 1765 | goto stop_threads; |
| 1766 | } |
| 1767 | |
| 1768 | /* Create timer thread. */ |
| 1769 | if (!launch_timer_thread(&timer_thread_parameters)) { |
| 1770 | retval = -1; |
| 1771 | goto stop_threads; |
| 1772 | } |
| 1773 | |
| 1774 | /* rotation_thread_data acquires the pipes' read side. */ |
| 1775 | rotation_thread_handle = |
| 1776 | rotation_thread_handle_create(rotation_timer_queue, the_notification_thread_handle); |
| 1777 | if (!rotation_thread_handle) { |
| 1778 | retval = -1; |
| 1779 | ERR("Failed to create rotation thread shared data"); |
| 1780 | goto stop_threads; |
| 1781 | } |
| 1782 | |
| 1783 | /* Create rotation thread. */ |
| 1784 | if (!launch_rotation_thread(rotation_thread_handle)) { |
| 1785 | retval = -1; |
| 1786 | goto stop_threads; |
| 1787 | } |
| 1788 | |
| 1789 | /* Create thread to manage the client socket */ |
| 1790 | client_thread = launch_client_thread(); |
| 1791 | if (!client_thread) { |
| 1792 | retval = -1; |
| 1793 | goto stop_threads; |
| 1794 | } |
| 1795 | |
| 1796 | /* Set credentials of the client socket and rundir */ |
| 1797 | if (is_root && set_permissions(the_config.rundir.value)) { |
| 1798 | retval = -1; |
| 1799 | goto stop_threads; |
| 1800 | } |
| 1801 | |
| 1802 | if (!launch_ust_dispatch_thread(&ust_cmd_queue, apps_cmd_pipe[1], apps_cmd_notify_pipe[1])) { |
| 1803 | retval = -1; |
| 1804 | goto stop_threads; |
| 1805 | } |
| 1806 | |
| 1807 | /* Create thread to manage application registration. */ |
| 1808 | register_apps_thread = launch_application_registration_thread(&ust_cmd_queue); |
| 1809 | if (!register_apps_thread) { |
| 1810 | retval = -1; |
| 1811 | goto stop_threads; |
| 1812 | } |
| 1813 | |
| 1814 | /* Create thread to manage application socket */ |
| 1815 | if (!launch_application_management_thread(apps_cmd_pipe[0])) { |
| 1816 | retval = -1; |
| 1817 | goto stop_threads; |
| 1818 | } |
| 1819 | |
| 1820 | /* Create thread to manage application notify socket */ |
| 1821 | if (!launch_application_notification_thread(apps_cmd_notify_pipe[0])) { |
| 1822 | retval = -1; |
| 1823 | goto stop_threads; |
| 1824 | } |
| 1825 | |
| 1826 | /* Create agent management thread. */ |
| 1827 | if (!launch_agent_management_thread()) { |
| 1828 | retval = -1; |
| 1829 | goto stop_threads; |
| 1830 | } |
| 1831 | |
| 1832 | /* Don't start this thread if kernel tracing is not requested nor root */ |
| 1833 | if (is_root && !the_config.no_kernel) { |
| 1834 | /* Create kernel thread to manage kernel event */ |
| 1835 | if (!launch_kernel_management_thread(the_kernel_poll_pipe[0])) { |
| 1836 | retval = -1; |
| 1837 | goto stop_threads; |
| 1838 | } |
| 1839 | |
| 1840 | if (kernel_get_notification_fd() >= 0) { |
| 1841 | ret = notification_thread_command_add_tracer_event_source( |
| 1842 | the_notification_thread_handle, |
| 1843 | kernel_get_notification_fd(), |
| 1844 | LTTNG_DOMAIN_KERNEL); |
| 1845 | if (ret != LTTNG_OK) { |
| 1846 | ERR("Failed to add kernel trigger event source to notification thread"); |
| 1847 | retval = -1; |
| 1848 | goto stop_threads; |
| 1849 | } |
| 1850 | } |
| 1851 | } |
| 1852 | |
| 1853 | /* Load sessions. */ |
| 1854 | ret = config_load_session(the_config.load_session_path.value, nullptr, 1, 1, nullptr); |
| 1855 | if (ret) { |
| 1856 | ERR("Session load failed: %s", error_get_str(ret)); |
| 1857 | retval = -1; |
| 1858 | goto stop_threads; |
| 1859 | } |
| 1860 | |
| 1861 | /* Initialization completed. */ |
| 1862 | sessiond_signal_parents(); |
| 1863 | |
| 1864 | /* |
| 1865 | * This is where we start awaiting program completion (e.g. through |
| 1866 | * signal that asks threads to teardown). |
| 1867 | */ |
| 1868 | |
| 1869 | /* Initiate teardown once activity occurs on the main quit pipe. */ |
| 1870 | sessiond_wait_for_main_quit_pipe(-1); |
| 1871 | |
| 1872 | stop_threads: |
| 1873 | |
| 1874 | DBG("Terminating all threads"); |
| 1875 | |
| 1876 | /* |
| 1877 | * Ensure that the client thread is no longer accepting new commands, |
| 1878 | * which could cause new sessions to be created. |
| 1879 | */ |
| 1880 | if (client_thread) { |
| 1881 | lttng_thread_shutdown(client_thread); |
| 1882 | lttng_thread_put(client_thread); |
| 1883 | } |
| 1884 | |
| 1885 | destroy_all_sessions_and_wait(); |
| 1886 | |
| 1887 | /* |
| 1888 | * At this point no new trigger can be registered (no sessions are |
| 1889 | * running/rotating) and clients can't connect to the session daemon |
| 1890 | * anymore. Unregister all triggers. |
| 1891 | */ |
| 1892 | unregister_all_triggers(); |
| 1893 | |
| 1894 | if (register_apps_thread) { |
| 1895 | lttng_thread_shutdown(register_apps_thread); |
| 1896 | lttng_thread_put(register_apps_thread); |
| 1897 | } |
| 1898 | lttng_thread_list_shutdown_orphans(); |
| 1899 | |
| 1900 | /* |
| 1901 | * Wait for all pending call_rcu work to complete before tearing |
| 1902 | * down data structures. call_rcu worker may be trying to |
| 1903 | * perform lookups in those structures. |
| 1904 | */ |
| 1905 | rcu_barrier(); |
| 1906 | |
| 1907 | rcu_thread_online(); |
| 1908 | sessiond_cleanup(); |
| 1909 | |
| 1910 | /* |
| 1911 | * Wait for all pending call_rcu work to complete before shutting down |
| 1912 | * the notification thread. This call_rcu work includes shutting down |
| 1913 | * UST apps and event notifier pipes. |
| 1914 | */ |
| 1915 | rcu_barrier(); |
| 1916 | |
| 1917 | if (notification_thread) { |
| 1918 | lttng_thread_shutdown(notification_thread); |
| 1919 | lttng_thread_put(notification_thread); |
| 1920 | } |
| 1921 | |
| 1922 | /* |
| 1923 | * Error accounting teardown has to be done after the teardown of all |
| 1924 | * event notifier pipes to ensure that no tracer may try to use the |
| 1925 | * error accounting facilities. |
| 1926 | */ |
| 1927 | event_notifier_error_accounting_fini(); |
| 1928 | |
| 1929 | /* |
| 1930 | * Unloading the kernel modules needs to be done after all kernel |
| 1931 | * ressources have been released. In our case, this includes the |
| 1932 | * notification fd, the event notifier group fd, error accounting fd, |
| 1933 | * all event and event notifier fds, etc. |
| 1934 | * |
| 1935 | * In short, at this point, we need to have called close() on all fds |
| 1936 | * received from the kernel tracer. |
| 1937 | */ |
| 1938 | if (is_root && !the_config.no_kernel) { |
| 1939 | DBG("Unloading kernel modules"); |
| 1940 | modprobe_remove_lttng_all(); |
| 1941 | } |
| 1942 | |
| 1943 | rcu_thread_offline(); |
| 1944 | rcu_unregister_thread(); |
| 1945 | |
| 1946 | if (rotation_thread_handle) { |
| 1947 | rotation_thread_handle_destroy(rotation_thread_handle); |
| 1948 | } |
| 1949 | |
| 1950 | /* |
| 1951 | * After the rotation and timer thread have quit, we can safely destroy |
| 1952 | * the rotation_timer_queue. |
| 1953 | */ |
| 1954 | rotation_thread_timer_queue_destroy(rotation_timer_queue); |
| 1955 | /* |
| 1956 | * The teardown of the notification system is performed after the |
| 1957 | * session daemon's teardown in order to allow it to be notified |
| 1958 | * of the active session and channels at the moment of the teardown. |
| 1959 | */ |
| 1960 | if (the_notification_thread_handle) { |
| 1961 | notification_thread_handle_destroy(the_notification_thread_handle); |
| 1962 | } |
| 1963 | lttng_pipe_destroy(ust32_channel_monitor_pipe); |
| 1964 | lttng_pipe_destroy(ust64_channel_monitor_pipe); |
| 1965 | lttng_pipe_destroy(kernel_channel_monitor_pipe); |
| 1966 | |
| 1967 | if (the_health_sessiond) { |
| 1968 | health_app_destroy(the_health_sessiond); |
| 1969 | } |
| 1970 | exit_create_run_as_worker_cleanup: |
| 1971 | exit_options: |
| 1972 | sessiond_cleanup_lock_file(); |
| 1973 | sessiond_cleanup_options(); |
| 1974 | |
| 1975 | exit_set_signal_handler: |
| 1976 | if (!retval) { |
| 1977 | exit(EXIT_SUCCESS); |
| 1978 | } else { |
| 1979 | exit(EXIT_FAILURE); |
| 1980 | } |
| 1981 | } |