| 1 | /* |
| 2 | * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca> |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or |
| 5 | * modify it under the terms of the GNU General Public License |
| 6 | * as published by the Free Software Foundation; either version 2 |
| 7 | * of the License, or (at your option) any later version. |
| 8 | * |
| 9 | * This program is distributed in the hope that it will be useful, |
| 10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 12 | * GNU General Public License for more details. |
| 13 | * |
| 14 | * You should have received a copy of the GNU General Public License |
| 15 | * along with this program; if not, write to the Free Software |
| 16 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
| 17 | */ |
| 18 | |
| 19 | #define _GNU_SOURCE |
| 20 | #include <fcntl.h> |
| 21 | #include <getopt.h> |
| 22 | #include <grp.h> |
| 23 | #include <limits.h> |
| 24 | #include <pthread.h> |
| 25 | #include <semaphore.h> |
| 26 | #include <signal.h> |
| 27 | #include <stdio.h> |
| 28 | #include <stdlib.h> |
| 29 | #include <string.h> |
| 30 | #include <sys/ipc.h> |
| 31 | #include <sys/shm.h> |
| 32 | #include <sys/socket.h> |
| 33 | #include <sys/stat.h> |
| 34 | #include <sys/types.h> |
| 35 | #include <unistd.h> |
| 36 | |
| 37 | #include <urcu/list.h> /* URCU list library (-lurcu) */ |
| 38 | #include <ust/ustctl.h> /* UST control lib (-lust) */ |
| 39 | #include <lttng/lttng.h> |
| 40 | |
| 41 | #include "liblttsessiondcomm.h" |
| 42 | #include "ltt-sessiond.h" |
| 43 | #include "lttngerr.h" |
| 44 | #include "kernel-ctl.h" |
| 45 | #include "ust-ctl.h" |
| 46 | #include "session.h" |
| 47 | #include "traceable-app.h" |
| 48 | |
| 49 | /* |
| 50 | * TODO: |
| 51 | * teardown: signal SIGTERM handler -> write into pipe. Threads waits |
| 52 | * with epoll on pipe and on other pipes/sockets for commands. Main |
| 53 | * simply waits on pthread join. |
| 54 | */ |
| 55 | |
| 56 | /* Const values */ |
| 57 | const char default_home_dir[] = DEFAULT_HOME_DIR; |
| 58 | const char default_tracing_group[] = DEFAULT_TRACING_GROUP; |
| 59 | const char default_ust_sock_dir[] = DEFAULT_UST_SOCK_DIR; |
| 60 | const char default_global_apps_pipe[] = DEFAULT_GLOBAL_APPS_PIPE; |
| 61 | |
| 62 | /* Variables */ |
| 63 | int opt_verbose; /* Not static for lttngerr.h */ |
| 64 | int opt_quiet; /* Not static for lttngerr.h */ |
| 65 | const char *progname; |
| 66 | const char *opt_tracing_group; |
| 67 | static int opt_sig_parent; |
| 68 | static int opt_daemon; |
| 69 | static int is_root; /* Set to 1 if the daemon is running as root */ |
| 70 | static pid_t ppid; /* Parent PID for --sig-parent option */ |
| 71 | static pid_t kconsumerd_pid; |
| 72 | |
| 73 | static char apps_unix_sock_path[PATH_MAX]; /* Global application Unix socket path */ |
| 74 | static char client_unix_sock_path[PATH_MAX]; /* Global client Unix socket path */ |
| 75 | static char kconsumerd_err_unix_sock_path[PATH_MAX]; /* kconsumerd error Unix socket path */ |
| 76 | static char kconsumerd_cmd_unix_sock_path[PATH_MAX]; /* kconsumerd command Unix socket path */ |
| 77 | |
| 78 | /* Sockets and FDs */ |
| 79 | static int client_sock; |
| 80 | static int apps_sock; |
| 81 | static int kconsumerd_err_sock; |
| 82 | static int kconsumerd_cmd_sock; |
| 83 | static int kernel_tracer_fd; |
| 84 | |
| 85 | /* Pthread, Mutexes and Semaphores */ |
| 86 | static pthread_t kconsumerd_thread; |
| 87 | static pthread_t apps_thread; |
| 88 | static pthread_t client_thread; |
| 89 | static sem_t kconsumerd_sem; |
| 90 | |
| 91 | static pthread_mutex_t kconsumerd_pid_mutex; /* Mutex to control kconsumerd pid assignation */ |
| 92 | |
| 93 | /* |
| 94 | * free_kernel_session |
| 95 | * |
| 96 | * Free all data structure inside a kernel session and the session pointer. |
| 97 | */ |
| 98 | static void free_kernel_session(struct ltt_kernel_session *session) |
| 99 | { |
| 100 | struct ltt_kernel_channel *chan; |
| 101 | struct ltt_kernel_stream *stream; |
| 102 | struct ltt_kernel_event *event; |
| 103 | |
| 104 | /* Clean metadata */ |
| 105 | close(session->metadata_stream_fd); |
| 106 | close(session->metadata->fd); |
| 107 | free(session->metadata->conf); |
| 108 | free(session->metadata); |
| 109 | |
| 110 | cds_list_for_each_entry(chan, &session->channel_list.head, list) { |
| 111 | /* Clean all event(s) */ |
| 112 | cds_list_for_each_entry(event, &chan->events_list.head, list) { |
| 113 | close(event->fd); |
| 114 | free(event->event); |
| 115 | free(event); |
| 116 | } |
| 117 | |
| 118 | /* Clean streams */ |
| 119 | cds_list_for_each_entry(stream, &chan->stream_list.head, list) { |
| 120 | close(stream->fd); |
| 121 | free(stream->pathname); |
| 122 | free(stream); |
| 123 | } |
| 124 | /* Clean channel */ |
| 125 | close(chan->fd); |
| 126 | free(chan->channel); |
| 127 | free(chan->pathname); |
| 128 | free(chan); |
| 129 | } |
| 130 | |
| 131 | close(session->fd); |
| 132 | free(session); |
| 133 | |
| 134 | DBG("All kernel session data structures freed"); |
| 135 | } |
| 136 | |
| 137 | /* |
| 138 | * teardown_kernel_session |
| 139 | * |
| 140 | * Complete teardown of a kernel session. This free all data structure |
| 141 | * related to a kernel session and update counter. |
| 142 | */ |
| 143 | static void teardown_kernel_session(struct ltt_session *session) |
| 144 | { |
| 145 | if (session->kernel_session != NULL) { |
| 146 | DBG("Tearing down kernel session"); |
| 147 | free_kernel_session(session->kernel_session); |
| 148 | /* Extra precaution */ |
| 149 | session->kernel_session = NULL; |
| 150 | /* Decrement session count */ |
| 151 | session->kern_session_count--; |
| 152 | } |
| 153 | } |
| 154 | |
| 155 | /* |
| 156 | * cleanup |
| 157 | * |
| 158 | * Cleanup the daemon on exit |
| 159 | */ |
| 160 | static void cleanup() |
| 161 | { |
| 162 | int ret; |
| 163 | char *cmd; |
| 164 | struct ltt_session *sess; |
| 165 | |
| 166 | DBG("Cleaning up"); |
| 167 | |
| 168 | /* <fun> */ |
| 169 | MSG("\n%c[%d;%dm*** assert failed *** ==> %c[%dm", 27,1,31,27,0); |
| 170 | MSG("%c[%d;%dmMatthew, BEET driven development works!%c[%dm",27,1,33,27,0); |
| 171 | /* </fun> */ |
| 172 | |
| 173 | /* Stopping all threads */ |
| 174 | DBG("Terminating all threads"); |
| 175 | pthread_cancel(client_thread); |
| 176 | pthread_cancel(apps_thread); |
| 177 | if (kconsumerd_pid != 0) { |
| 178 | pthread_cancel(kconsumerd_thread); |
| 179 | } |
| 180 | |
| 181 | DBG("Unlinking all unix socket"); |
| 182 | unlink(client_unix_sock_path); |
| 183 | unlink(apps_unix_sock_path); |
| 184 | unlink(kconsumerd_err_unix_sock_path); |
| 185 | |
| 186 | DBG("Removing %s directory", LTTNG_RUNDIR); |
| 187 | ret = asprintf(&cmd, "rm -rf " LTTNG_RUNDIR); |
| 188 | if (ret < 0) { |
| 189 | ERR("asprintf failed. Something is really wrong!"); |
| 190 | } |
| 191 | |
| 192 | /* Remove lttng run directory */ |
| 193 | ret = system(cmd); |
| 194 | if (ret < 0) { |
| 195 | ERR("Unable to clean " LTTNG_RUNDIR); |
| 196 | } |
| 197 | |
| 198 | DBG("Cleaning up all session"); |
| 199 | /* Cleanup ALL session */ |
| 200 | cds_list_for_each_entry(sess, <t_session_list.head, list) { |
| 201 | teardown_kernel_session(sess); |
| 202 | // TODO complete session cleanup (including UST) |
| 203 | } |
| 204 | |
| 205 | close(kernel_tracer_fd); |
| 206 | } |
| 207 | |
| 208 | /* |
| 209 | * send_unix_sock |
| 210 | * |
| 211 | * Send data on a unix socket using the liblttsessiondcomm API. |
| 212 | * |
| 213 | * Return lttcomm error code. |
| 214 | */ |
| 215 | static int send_unix_sock(int sock, void *buf, size_t len) |
| 216 | { |
| 217 | /* Check valid length */ |
| 218 | if (len <= 0) { |
| 219 | return -1; |
| 220 | } |
| 221 | |
| 222 | return lttcomm_send_unix_sock(sock, buf, len); |
| 223 | } |
| 224 | |
| 225 | /* |
| 226 | * clean_command_ctx |
| 227 | * |
| 228 | * Free memory of a command context structure. |
| 229 | */ |
| 230 | static void clean_command_ctx(struct command_ctx *cmd_ctx) |
| 231 | { |
| 232 | DBG("Clean command context structure %p", cmd_ctx); |
| 233 | if (cmd_ctx) { |
| 234 | if (cmd_ctx->llm) { |
| 235 | free(cmd_ctx->llm); |
| 236 | } |
| 237 | if (cmd_ctx->lsm) { |
| 238 | free(cmd_ctx->lsm); |
| 239 | } |
| 240 | free(cmd_ctx); |
| 241 | cmd_ctx = NULL; |
| 242 | } |
| 243 | } |
| 244 | |
| 245 | /* |
| 246 | * ust_connect_app |
| 247 | * |
| 248 | * Return a socket connected to the libust communication socket |
| 249 | * of the application identified by the pid. |
| 250 | * |
| 251 | * If the pid is not found in the traceable list, |
| 252 | * return -1 to indicate error. |
| 253 | */ |
| 254 | static int ust_connect_app(pid_t pid) |
| 255 | { |
| 256 | int sock; |
| 257 | struct ltt_traceable_app *lta; |
| 258 | |
| 259 | DBG("Connect to application pid %d", pid); |
| 260 | |
| 261 | lta = find_app_by_pid(pid); |
| 262 | if (lta == NULL) { |
| 263 | /* App not found */ |
| 264 | DBG("Application pid %d not found", pid); |
| 265 | return -1; |
| 266 | } |
| 267 | |
| 268 | sock = ustctl_connect_pid(lta->pid); |
| 269 | if (sock < 0) { |
| 270 | ERR("Fail connecting to the PID %d\n", pid); |
| 271 | } |
| 272 | |
| 273 | return sock; |
| 274 | } |
| 275 | |
| 276 | /* |
| 277 | * notify_apps |
| 278 | * |
| 279 | * Notify apps by writing 42 to a named pipe using name. |
| 280 | * Every applications waiting for a ltt-sessiond will be notified |
| 281 | * and re-register automatically to the session daemon. |
| 282 | * |
| 283 | * Return open or write error value. |
| 284 | */ |
| 285 | static int notify_apps(const char *name) |
| 286 | { |
| 287 | int fd; |
| 288 | int ret = -1; |
| 289 | |
| 290 | DBG("Notify the global application pipe"); |
| 291 | |
| 292 | /* Try opening the global pipe */ |
| 293 | fd = open(name, O_WRONLY); |
| 294 | if (fd < 0) { |
| 295 | goto error; |
| 296 | } |
| 297 | |
| 298 | /* Notify by writing on the pipe */ |
| 299 | ret = write(fd, "42", 2); |
| 300 | if (ret < 0) { |
| 301 | perror("write"); |
| 302 | } |
| 303 | |
| 304 | error: |
| 305 | return ret; |
| 306 | } |
| 307 | |
| 308 | /* |
| 309 | * setup_lttng_msg |
| 310 | * |
| 311 | * Setup the outgoing data buffer for the response (llm) by allocating the |
| 312 | * right amount of memory and copying the original information from the lsm |
| 313 | * structure. |
| 314 | * |
| 315 | * Return total size of the buffer pointed by buf. |
| 316 | */ |
| 317 | static int setup_lttng_msg(struct command_ctx *cmd_ctx, size_t size) |
| 318 | { |
| 319 | int ret, buf_size, trace_name_size; |
| 320 | |
| 321 | /* |
| 322 | * Check for the trace_name. If defined, it's part of the payload data of |
| 323 | * the llm structure. |
| 324 | */ |
| 325 | trace_name_size = strlen(cmd_ctx->lsm->trace_name); |
| 326 | buf_size = trace_name_size + size; |
| 327 | |
| 328 | cmd_ctx->llm = malloc(sizeof(struct lttcomm_lttng_msg) + buf_size); |
| 329 | if (cmd_ctx->llm == NULL) { |
| 330 | perror("malloc"); |
| 331 | ret = -ENOMEM; |
| 332 | goto error; |
| 333 | } |
| 334 | |
| 335 | /* Copy common data */ |
| 336 | cmd_ctx->llm->cmd_type = cmd_ctx->lsm->cmd_type; |
| 337 | cmd_ctx->llm->pid = cmd_ctx->lsm->pid; |
| 338 | if (!uuid_is_null(cmd_ctx->lsm->session_uuid)) { |
| 339 | uuid_copy(cmd_ctx->llm->session_uuid, cmd_ctx->lsm->session_uuid); |
| 340 | } |
| 341 | |
| 342 | cmd_ctx->llm->trace_name_offset = trace_name_size; |
| 343 | cmd_ctx->llm->data_size = size; |
| 344 | cmd_ctx->lttng_msg_size = sizeof(struct lttcomm_lttng_msg) + buf_size; |
| 345 | |
| 346 | /* Copy trace name to the llm structure. Begining of the payload. */ |
| 347 | memcpy(cmd_ctx->llm->payload, cmd_ctx->lsm->trace_name, trace_name_size); |
| 348 | |
| 349 | return buf_size; |
| 350 | |
| 351 | error: |
| 352 | return ret; |
| 353 | } |
| 354 | |
| 355 | /* |
| 356 | * thread_manage_kconsumerd |
| 357 | * |
| 358 | * This thread manage the kconsumerd error sent |
| 359 | * back to the session daemon. |
| 360 | */ |
| 361 | static void *thread_manage_kconsumerd(void *data) |
| 362 | { |
| 363 | int sock, ret; |
| 364 | enum lttcomm_return_code code; |
| 365 | |
| 366 | DBG("[thread] Manage kconsumerd started"); |
| 367 | |
| 368 | ret = lttcomm_listen_unix_sock(kconsumerd_err_sock); |
| 369 | if (ret < 0) { |
| 370 | goto error; |
| 371 | } |
| 372 | |
| 373 | sock = lttcomm_accept_unix_sock(kconsumerd_err_sock); |
| 374 | if (sock < 0) { |
| 375 | goto error; |
| 376 | } |
| 377 | |
| 378 | ret = lttcomm_recv_unix_sock(sock, &code, sizeof(enum lttcomm_return_code)); |
| 379 | if (ret <= 0) { |
| 380 | goto error; |
| 381 | } |
| 382 | |
| 383 | if (code == KCONSUMERD_COMMAND_SOCK_READY) { |
| 384 | kconsumerd_cmd_sock = lttcomm_connect_unix_sock(kconsumerd_cmd_unix_sock_path); |
| 385 | if (kconsumerd_cmd_sock < 0) { |
| 386 | perror("kconsumerd connect"); |
| 387 | goto error; |
| 388 | } |
| 389 | /* Signal condition to tell that the kconsumerd is ready */ |
| 390 | sem_post(&kconsumerd_sem); |
| 391 | DBG("Kconsumerd command socket ready"); |
| 392 | } else { |
| 393 | DBG("[sessiond] Kconsumerd error when waiting for SOCK_READY : %s", |
| 394 | lttcomm_get_readable_code(-code)); |
| 395 | goto error; |
| 396 | } |
| 397 | |
| 398 | /* Wait for any kconsumerd error */ |
| 399 | ret = lttcomm_recv_unix_sock(sock, &code, sizeof(enum lttcomm_return_code)); |
| 400 | if (ret <= 0) { |
| 401 | ERR("[sessiond] Kconsumerd closed the command socket"); |
| 402 | goto error; |
| 403 | } |
| 404 | |
| 405 | ERR("Kconsumerd return code : %s", lttcomm_get_readable_code(-code)); |
| 406 | |
| 407 | error: |
| 408 | kconsumerd_pid = 0; |
| 409 | return NULL; |
| 410 | } |
| 411 | |
| 412 | /* |
| 413 | * thread_manage_apps |
| 414 | * |
| 415 | * This thread manage the application socket communication |
| 416 | */ |
| 417 | static void *thread_manage_apps(void *data) |
| 418 | { |
| 419 | int sock, ret; |
| 420 | |
| 421 | /* TODO: Something more elegant is needed but fine for now */ |
| 422 | /* FIXME: change all types to either uint8_t, uint32_t, uint64_t |
| 423 | * for 32-bit vs 64-bit compat processes. */ |
| 424 | /* replicate in ust with version number */ |
| 425 | struct { |
| 426 | int reg; /* 1:register, 0:unregister */ |
| 427 | pid_t pid; |
| 428 | uid_t uid; |
| 429 | } reg_msg; |
| 430 | |
| 431 | DBG("[thread] Manage apps started"); |
| 432 | |
| 433 | ret = lttcomm_listen_unix_sock(apps_sock); |
| 434 | if (ret < 0) { |
| 435 | goto error; |
| 436 | } |
| 437 | |
| 438 | /* Notify all applications to register */ |
| 439 | notify_apps(default_global_apps_pipe); |
| 440 | |
| 441 | while (1) { |
| 442 | DBG("Accepting application registration"); |
| 443 | /* Blocking call, waiting for transmission */ |
| 444 | sock = lttcomm_accept_unix_sock(apps_sock); |
| 445 | if (sock < 0) { |
| 446 | goto error; |
| 447 | } |
| 448 | |
| 449 | /* Basic recv here to handle the very simple data |
| 450 | * that the libust send to register (reg_msg). |
| 451 | */ |
| 452 | ret = recv(sock, ®_msg, sizeof(reg_msg), 0); |
| 453 | if (ret < 0) { |
| 454 | perror("recv"); |
| 455 | continue; |
| 456 | } |
| 457 | |
| 458 | /* Add application to the global traceable list */ |
| 459 | if (reg_msg.reg == 1) { |
| 460 | /* Registering */ |
| 461 | ret = register_traceable_app(reg_msg.pid, reg_msg.uid); |
| 462 | if (ret < 0) { |
| 463 | /* register_traceable_app only return an error with |
| 464 | * ENOMEM. At this point, we better stop everything. |
| 465 | */ |
| 466 | goto error; |
| 467 | } |
| 468 | } else { |
| 469 | /* Unregistering */ |
| 470 | unregister_traceable_app(reg_msg.pid); |
| 471 | } |
| 472 | } |
| 473 | |
| 474 | error: |
| 475 | |
| 476 | return NULL; |
| 477 | } |
| 478 | |
| 479 | /* |
| 480 | * spawn_kconsumerd_thread |
| 481 | * |
| 482 | * Start the thread_manage_kconsumerd. This must be done after a kconsumerd |
| 483 | * exec or it will fails. |
| 484 | */ |
| 485 | static int spawn_kconsumerd_thread(void) |
| 486 | { |
| 487 | int ret; |
| 488 | |
| 489 | /* Setup semaphore */ |
| 490 | sem_init(&kconsumerd_sem, 0, 0); |
| 491 | |
| 492 | ret = pthread_create(&kconsumerd_thread, NULL, thread_manage_kconsumerd, (void *) NULL); |
| 493 | if (ret != 0) { |
| 494 | perror("pthread_create kconsumerd"); |
| 495 | goto error; |
| 496 | } |
| 497 | |
| 498 | /* Wait for the kconsumerd thread to be ready */ |
| 499 | sem_wait(&kconsumerd_sem); |
| 500 | |
| 501 | return 0; |
| 502 | |
| 503 | error: |
| 504 | return ret; |
| 505 | } |
| 506 | |
| 507 | /* |
| 508 | * spawn_kconsumerd |
| 509 | * |
| 510 | * Fork and exec a kernel consumer daemon (kconsumerd). |
| 511 | * |
| 512 | * NOTE: It is very important to fork a kconsumerd BEFORE opening any kernel |
| 513 | * file descriptor using the libkernelctl or kernel-ctl functions. So, a |
| 514 | * kernel consumer MUST only be spawned before creating a kernel session. |
| 515 | * |
| 516 | * Return pid if successful else -1. |
| 517 | */ |
| 518 | static pid_t spawn_kconsumerd(void) |
| 519 | { |
| 520 | int ret; |
| 521 | pid_t pid; |
| 522 | |
| 523 | pid = fork(); |
| 524 | if (pid == 0) { |
| 525 | /* |
| 526 | * Exec kconsumerd. |
| 527 | */ |
| 528 | execlp("kconsumerd", "kconsumerd", "--daemonize", NULL); |
| 529 | if (errno != 0) { |
| 530 | perror("kernel start consumer exec"); |
| 531 | } |
| 532 | exit(EXIT_FAILURE); |
| 533 | } else if (pid > 0) { |
| 534 | ret = pid; |
| 535 | goto error; |
| 536 | } else { |
| 537 | perror("kernel start consumer fork"); |
| 538 | ret = -errno; |
| 539 | goto error; |
| 540 | } |
| 541 | |
| 542 | error: |
| 543 | return ret; |
| 544 | } |
| 545 | |
| 546 | /* |
| 547 | * start_kconsumerd |
| 548 | * |
| 549 | * Spawn the kconsumerd daemon and session daemon thread. |
| 550 | */ |
| 551 | static int start_kconsumerd(void) |
| 552 | { |
| 553 | int ret; |
| 554 | |
| 555 | DBG("Spawning kconsumerd"); |
| 556 | |
| 557 | pthread_mutex_lock(&kconsumerd_pid_mutex); |
| 558 | if (kconsumerd_pid == 0) { |
| 559 | ret = spawn_kconsumerd(); |
| 560 | if (ret < 0) { |
| 561 | ERR("Spawning kconsumerd failed"); |
| 562 | ret = LTTCOMM_KERN_CONSUMER_FAIL; |
| 563 | pthread_mutex_unlock(&kconsumerd_pid_mutex); |
| 564 | goto error; |
| 565 | } |
| 566 | |
| 567 | /* Setting up the global kconsumerd_pid */ |
| 568 | kconsumerd_pid = ret; |
| 569 | } |
| 570 | pthread_mutex_unlock(&kconsumerd_pid_mutex); |
| 571 | |
| 572 | DBG("Spawning kconsumerd thread"); |
| 573 | |
| 574 | ret = spawn_kconsumerd_thread(); |
| 575 | if (ret < 0) { |
| 576 | ERR("Fatal error spawning kconsumerd thread"); |
| 577 | ret = LTTCOMM_FATAL; |
| 578 | goto error; |
| 579 | } |
| 580 | |
| 581 | return 0; |
| 582 | |
| 583 | error: |
| 584 | return ret; |
| 585 | } |
| 586 | |
| 587 | /* |
| 588 | * send_kconsumerd_fds |
| 589 | * |
| 590 | * Send all stream fds of the kernel session to the consumer. |
| 591 | */ |
| 592 | static int send_kconsumerd_fds(int sock, struct ltt_kernel_session *session) |
| 593 | { |
| 594 | int ret, i = 0; |
| 595 | /* Plus one here for the metadata fd */ |
| 596 | size_t nb_fd = session->stream_count_global + 1; |
| 597 | int fds[nb_fd]; |
| 598 | struct ltt_kernel_stream *stream; |
| 599 | struct ltt_kernel_channel *chan; |
| 600 | struct lttcomm_kconsumerd_header lkh; |
| 601 | struct lttcomm_kconsumerd_msg buf[nb_fd]; |
| 602 | |
| 603 | /* Add metadata data */ |
| 604 | fds[i] = session->metadata_stream_fd; |
| 605 | buf[i].fd = fds[i]; |
| 606 | buf[i].state = ACTIVE_FD; |
| 607 | buf[i].max_sb_size = session->metadata->conf->subbuf_size; |
| 608 | strncpy(buf[i].path_name, session->metadata->pathname, PATH_MAX); |
| 609 | |
| 610 | cds_list_for_each_entry(chan, &session->channel_list.head, list) { |
| 611 | cds_list_for_each_entry(stream, &chan->stream_list.head, list) { |
| 612 | i++; |
| 613 | fds[i] = stream->fd; |
| 614 | buf[i].fd = stream->fd; |
| 615 | buf[i].state = stream->state; |
| 616 | buf[i].max_sb_size = chan->channel->subbuf_size; |
| 617 | strncpy(buf[i].path_name, stream->pathname, PATH_MAX); |
| 618 | } |
| 619 | } |
| 620 | |
| 621 | /* Setup header */ |
| 622 | lkh.payload_size = nb_fd * sizeof(struct lttcomm_kconsumerd_msg); |
| 623 | lkh.cmd_type = LTTCOMM_ADD_STREAM; |
| 624 | |
| 625 | DBG("Sending kconsumerd header"); |
| 626 | |
| 627 | ret = lttcomm_send_unix_sock(sock, &lkh, sizeof(struct lttcomm_kconsumerd_header)); |
| 628 | if (ret < 0) { |
| 629 | perror("send kconsumerd header"); |
| 630 | goto error; |
| 631 | } |
| 632 | |
| 633 | DBG("Sending all fds to kconsumerd"); |
| 634 | |
| 635 | ret = lttcomm_send_fds_unix_sock(sock, buf, fds, nb_fd, lkh.payload_size); |
| 636 | if (ret < 0) { |
| 637 | perror("send kconsumerd fds"); |
| 638 | goto error; |
| 639 | } |
| 640 | |
| 641 | DBG("Kconsumerd fds sent"); |
| 642 | |
| 643 | return 0; |
| 644 | |
| 645 | error: |
| 646 | return ret; |
| 647 | } |
| 648 | |
| 649 | /* |
| 650 | * create_trace_dir |
| 651 | * |
| 652 | * Create the trace output directory. |
| 653 | */ |
| 654 | static int create_trace_dir(struct ltt_kernel_session *session) |
| 655 | { |
| 656 | int ret; |
| 657 | struct ltt_kernel_channel *chan; |
| 658 | |
| 659 | /* Create all channel directories */ |
| 660 | cds_list_for_each_entry(chan, &session->channel_list.head, list) { |
| 661 | ret = mkdir(chan->pathname, S_IRWXU | S_IRWXG ); |
| 662 | if (ret < 0) { |
| 663 | perror("mkdir trace path"); |
| 664 | ret = -errno; |
| 665 | goto error; |
| 666 | } |
| 667 | } |
| 668 | |
| 669 | return 0; |
| 670 | |
| 671 | error: |
| 672 | return ret; |
| 673 | } |
| 674 | |
| 675 | |
| 676 | /* |
| 677 | * process_client_msg |
| 678 | * |
| 679 | * Process the command requested by the lttng client within the command |
| 680 | * context structure. This function make sure that the return structure (llm) |
| 681 | * is set and ready for transmission before returning. |
| 682 | * |
| 683 | * Return any error encountered or 0 for success. |
| 684 | */ |
| 685 | static int process_client_msg(struct command_ctx *cmd_ctx) |
| 686 | { |
| 687 | int ret; |
| 688 | |
| 689 | DBG("Processing client command %d", cmd_ctx->lsm->cmd_type); |
| 690 | |
| 691 | /* Check command that needs a session */ |
| 692 | switch (cmd_ctx->lsm->cmd_type) { |
| 693 | case LTTNG_CREATE_SESSION: |
| 694 | case LTTNG_LIST_SESSIONS: |
| 695 | case UST_LIST_APPS: |
| 696 | break; |
| 697 | default: |
| 698 | cmd_ctx->session = find_session_by_uuid(cmd_ctx->lsm->session_uuid); |
| 699 | if (cmd_ctx->session == NULL) { |
| 700 | ret = LTTCOMM_SELECT_SESS; |
| 701 | goto error; |
| 702 | } |
| 703 | break; |
| 704 | } |
| 705 | |
| 706 | /* Check command for kernel tracing */ |
| 707 | switch (cmd_ctx->lsm->cmd_type) { |
| 708 | case KERNEL_CREATE_SESSION: |
| 709 | case KERNEL_CREATE_CHANNEL: |
| 710 | case KERNEL_CREATE_STREAM: |
| 711 | case KERNEL_DISABLE_EVENT: |
| 712 | case KERNEL_ENABLE_EVENT: |
| 713 | case KERNEL_OPEN_METADATA: |
| 714 | case KERNEL_START_TRACE: |
| 715 | case KERNEL_STOP_TRACE: |
| 716 | /* TODO: reconnect to kernel tracer to check if |
| 717 | * it's loadded */ |
| 718 | if (kernel_tracer_fd == 0) { |
| 719 | ret = LTTCOMM_KERN_NA; |
| 720 | goto error; |
| 721 | } |
| 722 | break; |
| 723 | } |
| 724 | |
| 725 | /* Connect to ust apps if available pid */ |
| 726 | if (cmd_ctx->lsm->pid > 0) { |
| 727 | /* Connect to app using ustctl API */ |
| 728 | cmd_ctx->ust_sock = ust_connect_app(cmd_ctx->lsm->pid); |
| 729 | if (cmd_ctx->ust_sock < 0) { |
| 730 | ret = LTTCOMM_NO_TRACEABLE; |
| 731 | goto error; |
| 732 | } |
| 733 | } |
| 734 | |
| 735 | /* Process by command type */ |
| 736 | switch (cmd_ctx->lsm->cmd_type) { |
| 737 | case KERNEL_CREATE_SESSION: |
| 738 | { |
| 739 | ret = setup_lttng_msg(cmd_ctx, 0); |
| 740 | if (ret < 0) { |
| 741 | goto setup_error; |
| 742 | } |
| 743 | |
| 744 | ret = start_kconsumerd(); |
| 745 | if (ret < 0) { |
| 746 | goto error; |
| 747 | } |
| 748 | |
| 749 | DBG("Creating kernel session"); |
| 750 | |
| 751 | ret = kernel_create_session(cmd_ctx->session, kernel_tracer_fd); |
| 752 | if (ret < 0) { |
| 753 | ret = LTTCOMM_KERN_SESS_FAIL; |
| 754 | goto error; |
| 755 | } |
| 756 | |
| 757 | ret = LTTCOMM_OK; |
| 758 | break; |
| 759 | } |
| 760 | case KERNEL_CREATE_CHANNEL: |
| 761 | { |
| 762 | ret = setup_lttng_msg(cmd_ctx, 0); |
| 763 | if (ret < 0) { |
| 764 | goto setup_error; |
| 765 | } |
| 766 | |
| 767 | DBG("Creating kernel channel"); |
| 768 | |
| 769 | ret = kernel_create_channel(cmd_ctx->session->kernel_session); |
| 770 | |
| 771 | if (ret < 0) { |
| 772 | ret = LTTCOMM_KERN_CHAN_FAIL; |
| 773 | goto error; |
| 774 | } |
| 775 | |
| 776 | ret = LTTCOMM_OK; |
| 777 | break; |
| 778 | } |
| 779 | case KERNEL_ENABLE_EVENT: |
| 780 | { |
| 781 | /* Setup lttng message with no payload */ |
| 782 | ret = setup_lttng_msg(cmd_ctx, 0); |
| 783 | if (ret < 0) { |
| 784 | goto setup_error; |
| 785 | } |
| 786 | |
| 787 | DBG("Enabling kernel event %s", cmd_ctx->lsm->u.event.event_name); |
| 788 | |
| 789 | ret = kernel_enable_event(cmd_ctx->session->kernel_session, cmd_ctx->lsm->u.event.event_name); |
| 790 | if (ret < 0) { |
| 791 | ret = LTTCOMM_KERN_ENABLE_FAIL; |
| 792 | goto error; |
| 793 | } |
| 794 | |
| 795 | ret = LTTCOMM_OK; |
| 796 | break; |
| 797 | } |
| 798 | case KERNEL_OPEN_METADATA: |
| 799 | { |
| 800 | /* Setup lttng message with no payload */ |
| 801 | ret = setup_lttng_msg(cmd_ctx, 0); |
| 802 | if (ret < 0) { |
| 803 | goto setup_error; |
| 804 | } |
| 805 | |
| 806 | DBG("Open kernel metadata"); |
| 807 | |
| 808 | ret = kernel_open_metadata(cmd_ctx->session->kernel_session); |
| 809 | if (ret < 0) { |
| 810 | ret = LTTCOMM_KERN_META_FAIL; |
| 811 | goto error; |
| 812 | } |
| 813 | |
| 814 | ret = LTTCOMM_OK; |
| 815 | break; |
| 816 | } |
| 817 | case KERNEL_CREATE_STREAM: |
| 818 | { |
| 819 | struct ltt_kernel_channel *chan; |
| 820 | /* Setup lttng message with no payload */ |
| 821 | ret = setup_lttng_msg(cmd_ctx, 0); |
| 822 | if (ret < 0) { |
| 823 | goto setup_error; |
| 824 | } |
| 825 | |
| 826 | DBG("Creating kernel stream"); |
| 827 | |
| 828 | ret = kernel_create_metadata_stream(cmd_ctx->session->kernel_session); |
| 829 | if (ret < 0) { |
| 830 | ERR("Kernel create metadata stream failed"); |
| 831 | ret = LTTCOMM_KERN_STREAM_FAIL; |
| 832 | goto error; |
| 833 | } |
| 834 | |
| 835 | /* For each channel */ |
| 836 | cds_list_for_each_entry(chan, &cmd_ctx->session->kernel_session->channel_list.head, list) { |
| 837 | ret = kernel_create_channel_stream(chan); |
| 838 | if (ret < 0) { |
| 839 | ERR("Kernel create channel stream failed"); |
| 840 | ret = LTTCOMM_KERN_STREAM_FAIL; |
| 841 | goto error; |
| 842 | } |
| 843 | /* Update the stream global counter */ |
| 844 | cmd_ctx->session->kernel_session->stream_count_global += ret; |
| 845 | } |
| 846 | |
| 847 | ret = LTTCOMM_OK; |
| 848 | break; |
| 849 | } |
| 850 | case KERNEL_START_TRACE: |
| 851 | { |
| 852 | /* Setup lttng message with no payload */ |
| 853 | ret = setup_lttng_msg(cmd_ctx, 0); |
| 854 | if (ret < 0) { |
| 855 | goto setup_error; |
| 856 | } |
| 857 | |
| 858 | DBG("Start kernel tracing"); |
| 859 | |
| 860 | ret = create_trace_dir(cmd_ctx->session->kernel_session); |
| 861 | if (ret < 0) { |
| 862 | if (ret == -EEXIST) { |
| 863 | ret = LTTCOMM_KERN_DIR_EXIST; |
| 864 | } else { |
| 865 | ret = LTTCOMM_KERN_DIR_FAIL; |
| 866 | goto error; |
| 867 | } |
| 868 | } |
| 869 | |
| 870 | ret = kernel_start_session(cmd_ctx->session->kernel_session); |
| 871 | if (ret < 0) { |
| 872 | ERR("Kernel start session failed"); |
| 873 | ret = LTTCOMM_KERN_START_FAIL; |
| 874 | goto error; |
| 875 | } |
| 876 | |
| 877 | ret = send_kconsumerd_fds(kconsumerd_cmd_sock, cmd_ctx->session->kernel_session); |
| 878 | if (ret < 0) { |
| 879 | ERR("Send kconsumerd fds failed"); |
| 880 | ret = LTTCOMM_KERN_CONSUMER_FAIL; |
| 881 | goto error; |
| 882 | } |
| 883 | |
| 884 | ret = LTTCOMM_OK; |
| 885 | break; |
| 886 | } |
| 887 | case KERNEL_STOP_TRACE: |
| 888 | { |
| 889 | /* Setup lttng message with no payload */ |
| 890 | ret = setup_lttng_msg(cmd_ctx, 0); |
| 891 | if (ret < 0) { |
| 892 | goto setup_error; |
| 893 | } |
| 894 | |
| 895 | if (cmd_ctx->session->kernel_session == NULL) { |
| 896 | ret = LTTCOMM_KERN_NO_SESSION; |
| 897 | goto error; |
| 898 | } |
| 899 | |
| 900 | DBG("Stop kernel tracing"); |
| 901 | |
| 902 | ret = kernel_stop_session(cmd_ctx->session->kernel_session); |
| 903 | if (ret < 0) { |
| 904 | ERR("Kernel stop session failed"); |
| 905 | ret = LTTCOMM_KERN_STOP_FAIL; |
| 906 | goto error; |
| 907 | } |
| 908 | |
| 909 | /* Clean kernel session teardown */ |
| 910 | teardown_kernel_session(cmd_ctx->session); |
| 911 | |
| 912 | ret = LTTCOMM_OK; |
| 913 | break; |
| 914 | } |
| 915 | case LTTNG_CREATE_SESSION: |
| 916 | { |
| 917 | /* Setup lttng message with no payload */ |
| 918 | ret = setup_lttng_msg(cmd_ctx, 0); |
| 919 | if (ret < 0) { |
| 920 | goto setup_error; |
| 921 | } |
| 922 | |
| 923 | ret = create_session(cmd_ctx->lsm->session_name, &cmd_ctx->llm->session_uuid); |
| 924 | if (ret < 0) { |
| 925 | if (ret == -1) { |
| 926 | ret = LTTCOMM_EXIST_SESS; |
| 927 | } else { |
| 928 | ret = LTTCOMM_FATAL; |
| 929 | } |
| 930 | goto error; |
| 931 | } |
| 932 | |
| 933 | ret = LTTCOMM_OK; |
| 934 | break; |
| 935 | } |
| 936 | case LTTNG_DESTROY_SESSION: |
| 937 | { |
| 938 | /* Setup lttng message with no payload */ |
| 939 | ret = setup_lttng_msg(cmd_ctx, 0); |
| 940 | if (ret < 0) { |
| 941 | goto setup_error; |
| 942 | } |
| 943 | |
| 944 | ret = destroy_session(&cmd_ctx->lsm->session_uuid); |
| 945 | if (ret < 0) { |
| 946 | ret = LTTCOMM_NO_SESS; |
| 947 | goto error; |
| 948 | } |
| 949 | |
| 950 | ret = LTTCOMM_OK; |
| 951 | break; |
| 952 | } |
| 953 | case LTTNG_LIST_TRACES: |
| 954 | { |
| 955 | unsigned int trace_count; |
| 956 | |
| 957 | trace_count = get_trace_count_per_session(cmd_ctx->session); |
| 958 | if (trace_count == 0) { |
| 959 | ret = LTTCOMM_NO_TRACE; |
| 960 | goto error; |
| 961 | } |
| 962 | |
| 963 | ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_trace) * trace_count); |
| 964 | if (ret < 0) { |
| 965 | goto setup_error; |
| 966 | } |
| 967 | |
| 968 | get_traces_per_session(cmd_ctx->session, |
| 969 | (struct lttng_trace *)(cmd_ctx->llm->payload)); |
| 970 | |
| 971 | ret = LTTCOMM_OK; |
| 972 | break; |
| 973 | } |
| 974 | case UST_CREATE_TRACE: |
| 975 | { |
| 976 | /* Setup lttng message with no payload */ |
| 977 | ret = setup_lttng_msg(cmd_ctx, 0); |
| 978 | if (ret < 0) { |
| 979 | goto setup_error; |
| 980 | } |
| 981 | |
| 982 | ret = ust_create_trace(cmd_ctx); |
| 983 | if (ret < 0) { |
| 984 | goto setup_error; |
| 985 | } |
| 986 | break; |
| 987 | } |
| 988 | case UST_LIST_APPS: |
| 989 | { |
| 990 | unsigned int app_count; |
| 991 | |
| 992 | app_count = get_app_count(); |
| 993 | DBG("Traceable application count : %d", app_count); |
| 994 | if (app_count == 0) { |
| 995 | ret = LTTCOMM_NO_APPS; |
| 996 | goto error; |
| 997 | } |
| 998 | |
| 999 | ret = setup_lttng_msg(cmd_ctx, sizeof(pid_t) * app_count); |
| 1000 | if (ret < 0) { |
| 1001 | goto setup_error; |
| 1002 | } |
| 1003 | |
| 1004 | get_app_list_pids((pid_t *)(cmd_ctx->llm->payload)); |
| 1005 | |
| 1006 | ret = LTTCOMM_OK; |
| 1007 | break; |
| 1008 | } |
| 1009 | case UST_START_TRACE: |
| 1010 | { |
| 1011 | /* Setup lttng message with no payload */ |
| 1012 | ret = setup_lttng_msg(cmd_ctx, 0); |
| 1013 | if (ret < 0) { |
| 1014 | goto setup_error; |
| 1015 | } |
| 1016 | |
| 1017 | ret = ust_start_trace(cmd_ctx); |
| 1018 | if (ret < 0) { |
| 1019 | goto setup_error; |
| 1020 | } |
| 1021 | break; |
| 1022 | } |
| 1023 | case UST_STOP_TRACE: |
| 1024 | { |
| 1025 | /* Setup lttng message with no payload */ |
| 1026 | ret = setup_lttng_msg(cmd_ctx, 0); |
| 1027 | if (ret < 0) { |
| 1028 | goto setup_error; |
| 1029 | } |
| 1030 | |
| 1031 | ret = ust_stop_trace(cmd_ctx); |
| 1032 | if (ret < 0) { |
| 1033 | goto setup_error; |
| 1034 | } |
| 1035 | break; |
| 1036 | } |
| 1037 | case LTTNG_LIST_SESSIONS: |
| 1038 | { |
| 1039 | unsigned int session_count; |
| 1040 | |
| 1041 | session_count = get_session_count(); |
| 1042 | if (session_count == 0) { |
| 1043 | ret = LTTCOMM_NO_SESS; |
| 1044 | goto error; |
| 1045 | } |
| 1046 | |
| 1047 | ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_session) * session_count); |
| 1048 | if (ret < 0) { |
| 1049 | goto setup_error; |
| 1050 | } |
| 1051 | |
| 1052 | get_lttng_session((struct lttng_session *)(cmd_ctx->llm->payload)); |
| 1053 | |
| 1054 | ret = LTTCOMM_OK; |
| 1055 | break; |
| 1056 | } |
| 1057 | default: |
| 1058 | /* Undefined command */ |
| 1059 | ret = setup_lttng_msg(cmd_ctx, 0); |
| 1060 | if (ret < 0) { |
| 1061 | goto setup_error; |
| 1062 | } |
| 1063 | |
| 1064 | ret = LTTCOMM_UND; |
| 1065 | break; |
| 1066 | } |
| 1067 | |
| 1068 | /* Set return code */ |
| 1069 | cmd_ctx->llm->ret_code = ret; |
| 1070 | |
| 1071 | return ret; |
| 1072 | |
| 1073 | error: |
| 1074 | if (cmd_ctx->llm == NULL) { |
| 1075 | DBG("Missing llm structure. Allocating one."); |
| 1076 | if (setup_lttng_msg(cmd_ctx, 0) < 0) { |
| 1077 | goto setup_error; |
| 1078 | } |
| 1079 | } |
| 1080 | /* Notify client of error */ |
| 1081 | cmd_ctx->llm->ret_code = ret; |
| 1082 | |
| 1083 | setup_error: |
| 1084 | return ret; |
| 1085 | } |
| 1086 | |
| 1087 | /* |
| 1088 | * thread_manage_clients |
| 1089 | * |
| 1090 | * This thread manage all clients request using the unix |
| 1091 | * client socket for communication. |
| 1092 | */ |
| 1093 | static void *thread_manage_clients(void *data) |
| 1094 | { |
| 1095 | int sock, ret; |
| 1096 | struct command_ctx *cmd_ctx; |
| 1097 | |
| 1098 | DBG("[thread] Manage client started"); |
| 1099 | |
| 1100 | ret = lttcomm_listen_unix_sock(client_sock); |
| 1101 | if (ret < 0) { |
| 1102 | goto error; |
| 1103 | } |
| 1104 | |
| 1105 | /* Notify parent pid that we are ready |
| 1106 | * to accept command for client side. |
| 1107 | */ |
| 1108 | if (opt_sig_parent) { |
| 1109 | kill(ppid, SIGCHLD); |
| 1110 | } |
| 1111 | |
| 1112 | while (1) { |
| 1113 | /* Blocking call, waiting for transmission */ |
| 1114 | DBG("Accepting client command ..."); |
| 1115 | sock = lttcomm_accept_unix_sock(client_sock); |
| 1116 | if (sock < 0) { |
| 1117 | goto error; |
| 1118 | } |
| 1119 | |
| 1120 | /* Allocate context command to process the client request */ |
| 1121 | cmd_ctx = malloc(sizeof(struct command_ctx)); |
| 1122 | |
| 1123 | /* Allocate data buffer for reception */ |
| 1124 | cmd_ctx->lsm = malloc(sizeof(struct lttcomm_session_msg)); |
| 1125 | cmd_ctx->llm = NULL; |
| 1126 | cmd_ctx->session = NULL; |
| 1127 | |
| 1128 | /* |
| 1129 | * Data is received from the lttng client. The struct |
| 1130 | * lttcomm_session_msg (lsm) contains the command and data request of |
| 1131 | * the client. |
| 1132 | */ |
| 1133 | DBG("Receiving data from client ..."); |
| 1134 | ret = lttcomm_recv_unix_sock(sock, cmd_ctx->lsm, sizeof(struct lttcomm_session_msg)); |
| 1135 | if (ret <= 0) { |
| 1136 | continue; |
| 1137 | } |
| 1138 | |
| 1139 | /* |
| 1140 | * This function dispatch the work to the kernel or userspace tracer |
| 1141 | * libs and fill the lttcomm_lttng_msg data structure of all the needed |
| 1142 | * informations for the client. The command context struct contains |
| 1143 | * everything this function may needs. |
| 1144 | */ |
| 1145 | ret = process_client_msg(cmd_ctx); |
| 1146 | if (ret < 0) { |
| 1147 | /* TODO: Inform client somehow of the fatal error. At this point, |
| 1148 | * ret < 0 means that a malloc failed (ENOMEM). */ |
| 1149 | /* Error detected but still accept command */ |
| 1150 | clean_command_ctx(cmd_ctx); |
| 1151 | continue; |
| 1152 | } |
| 1153 | |
| 1154 | DBG("Sending response (size: %d, retcode: %d)", |
| 1155 | cmd_ctx->lttng_msg_size, cmd_ctx->llm->ret_code); |
| 1156 | ret = send_unix_sock(sock, cmd_ctx->llm, cmd_ctx->lttng_msg_size); |
| 1157 | if (ret < 0) { |
| 1158 | ERR("Failed to send data back to client"); |
| 1159 | } |
| 1160 | |
| 1161 | clean_command_ctx(cmd_ctx); |
| 1162 | } |
| 1163 | |
| 1164 | error: |
| 1165 | return NULL; |
| 1166 | } |
| 1167 | |
| 1168 | |
| 1169 | /* |
| 1170 | * usage function on stderr |
| 1171 | */ |
| 1172 | static void usage(void) |
| 1173 | { |
| 1174 | fprintf(stderr, "Usage: %s OPTIONS\n\nOptions:\n", progname); |
| 1175 | fprintf(stderr, " -h, --help Display this usage.\n"); |
| 1176 | fprintf(stderr, " -c, --client-sock PATH Specify path for the client unix socket\n"); |
| 1177 | fprintf(stderr, " -a, --apps-sock PATH Specify path for apps unix socket\n"); |
| 1178 | fprintf(stderr, " --kconsumerd-err-sock PATH Specify path for the kernel consumer error socket\n"); |
| 1179 | fprintf(stderr, " --kconsumerd-cmd-sock PATH Specify path for the kernel consumer command socket\n"); |
| 1180 | fprintf(stderr, " -d, --daemonize Start as a daemon.\n"); |
| 1181 | fprintf(stderr, " -g, --group NAME Specify the tracing group name. (default: tracing)\n"); |
| 1182 | fprintf(stderr, " -V, --version Show version number.\n"); |
| 1183 | fprintf(stderr, " -S, --sig-parent Send SIGCHLD to parent pid to notify readiness.\n"); |
| 1184 | fprintf(stderr, " -q, --quiet No output at all.\n"); |
| 1185 | fprintf(stderr, " -v, --verbose Verbose mode. Activate DBG() macro.\n"); |
| 1186 | } |
| 1187 | |
| 1188 | /* |
| 1189 | * daemon argument parsing |
| 1190 | */ |
| 1191 | static int parse_args(int argc, char **argv) |
| 1192 | { |
| 1193 | int c; |
| 1194 | |
| 1195 | static struct option long_options[] = { |
| 1196 | { "client-sock", 1, 0, 'c' }, |
| 1197 | { "apps-sock", 1, 0, 'a' }, |
| 1198 | { "kconsumerd-cmd-sock", 1, 0, 0 }, |
| 1199 | { "kconsumerd-err-sock", 1, 0, 0 }, |
| 1200 | { "daemonize", 0, 0, 'd' }, |
| 1201 | { "sig-parent", 0, 0, 'S' }, |
| 1202 | { "help", 0, 0, 'h' }, |
| 1203 | { "group", 1, 0, 'g' }, |
| 1204 | { "version", 0, 0, 'V' }, |
| 1205 | { "quiet", 0, 0, 'q' }, |
| 1206 | { "verbose", 0, 0, 'v' }, |
| 1207 | { NULL, 0, 0, 0 } |
| 1208 | }; |
| 1209 | |
| 1210 | while (1) { |
| 1211 | int option_index = 0; |
| 1212 | c = getopt_long(argc, argv, "dhqvVS" "a:c:g:s:E:C:", long_options, &option_index); |
| 1213 | if (c == -1) { |
| 1214 | break; |
| 1215 | } |
| 1216 | |
| 1217 | switch (c) { |
| 1218 | case 0: |
| 1219 | fprintf(stderr, "option %s", long_options[option_index].name); |
| 1220 | if (optarg) { |
| 1221 | fprintf(stderr, " with arg %s\n", optarg); |
| 1222 | } |
| 1223 | break; |
| 1224 | case 'c': |
| 1225 | snprintf(client_unix_sock_path, PATH_MAX, "%s", optarg); |
| 1226 | break; |
| 1227 | case 'a': |
| 1228 | snprintf(apps_unix_sock_path, PATH_MAX, "%s", optarg); |
| 1229 | break; |
| 1230 | case 'd': |
| 1231 | opt_daemon = 1; |
| 1232 | break; |
| 1233 | case 'g': |
| 1234 | opt_tracing_group = strdup(optarg); |
| 1235 | break; |
| 1236 | case 'h': |
| 1237 | usage(); |
| 1238 | exit(EXIT_FAILURE); |
| 1239 | case 'V': |
| 1240 | fprintf(stdout, "%s\n", VERSION); |
| 1241 | exit(EXIT_SUCCESS); |
| 1242 | case 'S': |
| 1243 | opt_sig_parent = 1; |
| 1244 | break; |
| 1245 | case 'E': |
| 1246 | snprintf(kconsumerd_err_unix_sock_path, PATH_MAX, "%s", optarg); |
| 1247 | break; |
| 1248 | case 'C': |
| 1249 | snprintf(kconsumerd_cmd_unix_sock_path, PATH_MAX, "%s", optarg); |
| 1250 | break; |
| 1251 | case 'q': |
| 1252 | opt_quiet = 1; |
| 1253 | break; |
| 1254 | case 'v': |
| 1255 | opt_verbose = 1; |
| 1256 | break; |
| 1257 | default: |
| 1258 | /* Unknown option or other error. |
| 1259 | * Error is printed by getopt, just return */ |
| 1260 | return -1; |
| 1261 | } |
| 1262 | } |
| 1263 | |
| 1264 | return 0; |
| 1265 | } |
| 1266 | |
| 1267 | /* |
| 1268 | * init_daemon_socket |
| 1269 | * |
| 1270 | * Creates the two needed socket by the daemon. |
| 1271 | * apps_sock - The communication socket for all UST apps. |
| 1272 | * client_sock - The communication of the cli tool (lttng). |
| 1273 | */ |
| 1274 | static int init_daemon_socket() |
| 1275 | { |
| 1276 | int ret = 0; |
| 1277 | mode_t old_umask; |
| 1278 | |
| 1279 | old_umask = umask(0); |
| 1280 | |
| 1281 | /* Create client tool unix socket */ |
| 1282 | client_sock = lttcomm_create_unix_sock(client_unix_sock_path); |
| 1283 | if (client_sock < 0) { |
| 1284 | ERR("Create unix sock failed: %s", client_unix_sock_path); |
| 1285 | ret = -1; |
| 1286 | goto end; |
| 1287 | } |
| 1288 | |
| 1289 | /* File permission MUST be 660 */ |
| 1290 | ret = chmod(client_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); |
| 1291 | if (ret < 0) { |
| 1292 | ERR("Set file permissions failed: %s", client_unix_sock_path); |
| 1293 | perror("chmod"); |
| 1294 | goto end; |
| 1295 | } |
| 1296 | |
| 1297 | /* Create the application unix socket */ |
| 1298 | apps_sock = lttcomm_create_unix_sock(apps_unix_sock_path); |
| 1299 | if (apps_sock < 0) { |
| 1300 | ERR("Create unix sock failed: %s", apps_unix_sock_path); |
| 1301 | ret = -1; |
| 1302 | goto end; |
| 1303 | } |
| 1304 | |
| 1305 | /* File permission MUST be 666 */ |
| 1306 | ret = chmod(apps_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH); |
| 1307 | if (ret < 0) { |
| 1308 | ERR("Set file permissions failed: %s", apps_unix_sock_path); |
| 1309 | perror("chmod"); |
| 1310 | goto end; |
| 1311 | } |
| 1312 | |
| 1313 | end: |
| 1314 | umask(old_umask); |
| 1315 | return ret; |
| 1316 | } |
| 1317 | |
| 1318 | /* |
| 1319 | * check_existing_daemon |
| 1320 | * |
| 1321 | * Check if the global socket is available. |
| 1322 | * If yes, error is returned. |
| 1323 | */ |
| 1324 | static int check_existing_daemon() |
| 1325 | { |
| 1326 | int ret; |
| 1327 | |
| 1328 | ret = access(client_unix_sock_path, F_OK); |
| 1329 | if (ret == 0) { |
| 1330 | ret = access(apps_unix_sock_path, F_OK); |
| 1331 | } |
| 1332 | |
| 1333 | return ret; |
| 1334 | } |
| 1335 | |
| 1336 | /* |
| 1337 | * get_home_dir |
| 1338 | * |
| 1339 | * Return pointer to home directory path using |
| 1340 | * the env variable HOME. |
| 1341 | * |
| 1342 | * Default : /tmp |
| 1343 | */ |
| 1344 | static const char *get_home_dir(void) |
| 1345 | { |
| 1346 | const char *home_path; |
| 1347 | |
| 1348 | if ((home_path = (const char *) getenv("HOME")) == NULL) { |
| 1349 | home_path = default_home_dir; |
| 1350 | } |
| 1351 | |
| 1352 | return home_path; |
| 1353 | } |
| 1354 | |
| 1355 | /* |
| 1356 | * set_permissions |
| 1357 | * |
| 1358 | * Set the tracing group gid onto the client socket. |
| 1359 | * |
| 1360 | * Race window between mkdir and chown is OK because we are going from |
| 1361 | * less permissive (root.root) to more permissive (root.tracing). |
| 1362 | */ |
| 1363 | static int set_permissions(void) |
| 1364 | { |
| 1365 | int ret; |
| 1366 | struct group *grp; |
| 1367 | |
| 1368 | /* Decide which group name to use */ |
| 1369 | (opt_tracing_group != NULL) ? |
| 1370 | (grp = getgrnam(opt_tracing_group)) : |
| 1371 | (grp = getgrnam(default_tracing_group)); |
| 1372 | |
| 1373 | if (grp == NULL) { |
| 1374 | ERR("Missing tracing group. Aborting execution.\n"); |
| 1375 | ret = -1; |
| 1376 | goto end; |
| 1377 | } |
| 1378 | |
| 1379 | /* Set lttng run dir */ |
| 1380 | ret = chown(LTTNG_RUNDIR, 0, grp->gr_gid); |
| 1381 | if (ret < 0) { |
| 1382 | ERR("Unable to set group on " LTTNG_RUNDIR); |
| 1383 | perror("chown"); |
| 1384 | } |
| 1385 | |
| 1386 | /* lttng client socket path */ |
| 1387 | ret = chown(client_unix_sock_path, 0, grp->gr_gid); |
| 1388 | if (ret < 0) { |
| 1389 | ERR("Unable to set group on %s", client_unix_sock_path); |
| 1390 | perror("chown"); |
| 1391 | } |
| 1392 | |
| 1393 | /* kconsumerd error socket path */ |
| 1394 | ret = chown(kconsumerd_err_unix_sock_path, 0, grp->gr_gid); |
| 1395 | if (ret < 0) { |
| 1396 | ERR("Unable to set group on %s", kconsumerd_err_unix_sock_path); |
| 1397 | perror("chown"); |
| 1398 | } |
| 1399 | |
| 1400 | DBG("All permissions are set"); |
| 1401 | |
| 1402 | end: |
| 1403 | return ret; |
| 1404 | } |
| 1405 | |
| 1406 | /* |
| 1407 | * create_lttng_rundir |
| 1408 | * |
| 1409 | * Create the lttng run directory needed for all |
| 1410 | * global sockets and pipe. |
| 1411 | */ |
| 1412 | static int create_lttng_rundir(void) |
| 1413 | { |
| 1414 | int ret; |
| 1415 | |
| 1416 | ret = mkdir(LTTNG_RUNDIR, S_IRWXU | S_IRWXG ); |
| 1417 | if (ret < 0) { |
| 1418 | ERR("Unable to create " LTTNG_RUNDIR); |
| 1419 | goto error; |
| 1420 | } |
| 1421 | |
| 1422 | error: |
| 1423 | return ret; |
| 1424 | } |
| 1425 | |
| 1426 | /* |
| 1427 | * init_kernel_tracer |
| 1428 | * |
| 1429 | * Setup necessary data for kernel tracer action. |
| 1430 | */ |
| 1431 | static void init_kernel_tracer(void) |
| 1432 | { |
| 1433 | /* Set the global kernel tracer fd */ |
| 1434 | kernel_tracer_fd = open(DEFAULT_KERNEL_TRACER_PATH, O_RDWR); |
| 1435 | if (kernel_tracer_fd < 0) { |
| 1436 | WARN("No kernel tracer available"); |
| 1437 | kernel_tracer_fd = 0; |
| 1438 | } |
| 1439 | |
| 1440 | DBG("Kernel tracer fd %d", kernel_tracer_fd); |
| 1441 | } |
| 1442 | |
| 1443 | /* |
| 1444 | * set_kconsumerd_sockets |
| 1445 | * |
| 1446 | * Setup sockets and directory needed by the kconsumerd |
| 1447 | * communication with the session daemon. |
| 1448 | */ |
| 1449 | static int set_kconsumerd_sockets(void) |
| 1450 | { |
| 1451 | int ret; |
| 1452 | |
| 1453 | if (strlen(kconsumerd_err_unix_sock_path) == 0) { |
| 1454 | snprintf(kconsumerd_err_unix_sock_path, PATH_MAX, KCONSUMERD_ERR_SOCK_PATH); |
| 1455 | } |
| 1456 | |
| 1457 | if (strlen(kconsumerd_cmd_unix_sock_path) == 0) { |
| 1458 | snprintf(kconsumerd_cmd_unix_sock_path, PATH_MAX, KCONSUMERD_CMD_SOCK_PATH); |
| 1459 | } |
| 1460 | |
| 1461 | ret = mkdir(KCONSUMERD_PATH, S_IRWXU | S_IRWXG); |
| 1462 | if (ret < 0) { |
| 1463 | ERR("Failed to create " KCONSUMERD_PATH); |
| 1464 | goto error; |
| 1465 | } |
| 1466 | |
| 1467 | /* Create the kconsumerd error unix socket */ |
| 1468 | kconsumerd_err_sock = lttcomm_create_unix_sock(kconsumerd_err_unix_sock_path); |
| 1469 | if (kconsumerd_err_sock < 0) { |
| 1470 | ERR("Create unix sock failed: %s", kconsumerd_err_unix_sock_path); |
| 1471 | ret = -1; |
| 1472 | goto error; |
| 1473 | } |
| 1474 | |
| 1475 | /* File permission MUST be 660 */ |
| 1476 | ret = chmod(kconsumerd_err_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); |
| 1477 | if (ret < 0) { |
| 1478 | ERR("Set file permissions failed: %s", kconsumerd_err_unix_sock_path); |
| 1479 | perror("chmod"); |
| 1480 | goto error; |
| 1481 | } |
| 1482 | |
| 1483 | error: |
| 1484 | return ret; |
| 1485 | } |
| 1486 | |
| 1487 | /* |
| 1488 | * sighandler |
| 1489 | * |
| 1490 | * Signal handler for the daemon |
| 1491 | */ |
| 1492 | static void sighandler(int sig) |
| 1493 | { |
| 1494 | switch (sig) { |
| 1495 | case SIGPIPE: |
| 1496 | DBG("SIGPIPE catched"); |
| 1497 | return; |
| 1498 | case SIGINT: |
| 1499 | DBG("SIGINT catched"); |
| 1500 | cleanup(); |
| 1501 | break; |
| 1502 | case SIGTERM: |
| 1503 | DBG("SIGTERM catched"); |
| 1504 | cleanup(); |
| 1505 | break; |
| 1506 | default: |
| 1507 | break; |
| 1508 | } |
| 1509 | |
| 1510 | exit(EXIT_SUCCESS); |
| 1511 | } |
| 1512 | |
| 1513 | /* |
| 1514 | * set_signal_handler |
| 1515 | * |
| 1516 | * Setup signal handler for : |
| 1517 | * SIGINT, SIGTERM, SIGPIPE |
| 1518 | */ |
| 1519 | static int set_signal_handler(void) |
| 1520 | { |
| 1521 | int ret = 0; |
| 1522 | struct sigaction sa; |
| 1523 | sigset_t sigset; |
| 1524 | |
| 1525 | if ((ret = sigemptyset(&sigset)) < 0) { |
| 1526 | perror("sigemptyset"); |
| 1527 | return ret; |
| 1528 | } |
| 1529 | |
| 1530 | sa.sa_handler = sighandler; |
| 1531 | sa.sa_mask = sigset; |
| 1532 | sa.sa_flags = 0; |
| 1533 | if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) { |
| 1534 | perror("sigaction"); |
| 1535 | return ret; |
| 1536 | } |
| 1537 | |
| 1538 | if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) { |
| 1539 | perror("sigaction"); |
| 1540 | return ret; |
| 1541 | } |
| 1542 | |
| 1543 | if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) { |
| 1544 | perror("sigaction"); |
| 1545 | return ret; |
| 1546 | } |
| 1547 | |
| 1548 | DBG("Signal handler set for SIGTERM, SIGPIPE and SIGINT"); |
| 1549 | |
| 1550 | return ret; |
| 1551 | } |
| 1552 | |
| 1553 | /* |
| 1554 | * main |
| 1555 | */ |
| 1556 | int main(int argc, char **argv) |
| 1557 | { |
| 1558 | int ret = 0; |
| 1559 | void *status; |
| 1560 | |
| 1561 | /* Parse arguments */ |
| 1562 | progname = argv[0]; |
| 1563 | if ((ret = parse_args(argc, argv) < 0)) { |
| 1564 | goto error; |
| 1565 | } |
| 1566 | |
| 1567 | /* Daemonize */ |
| 1568 | if (opt_daemon) { |
| 1569 | ret = daemon(0, 0); |
| 1570 | if (ret < 0) { |
| 1571 | perror("daemon"); |
| 1572 | goto error; |
| 1573 | } |
| 1574 | } |
| 1575 | |
| 1576 | /* Check if daemon is UID = 0 */ |
| 1577 | is_root = !getuid(); |
| 1578 | |
| 1579 | /* Set all sockets path */ |
| 1580 | if (is_root) { |
| 1581 | ret = create_lttng_rundir(); |
| 1582 | if (ret < 0) { |
| 1583 | goto error; |
| 1584 | } |
| 1585 | |
| 1586 | if (strlen(apps_unix_sock_path) == 0) { |
| 1587 | snprintf(apps_unix_sock_path, PATH_MAX, |
| 1588 | DEFAULT_GLOBAL_APPS_UNIX_SOCK); |
| 1589 | } |
| 1590 | |
| 1591 | if (strlen(client_unix_sock_path) == 0) { |
| 1592 | snprintf(client_unix_sock_path, PATH_MAX, |
| 1593 | DEFAULT_GLOBAL_CLIENT_UNIX_SOCK); |
| 1594 | } |
| 1595 | |
| 1596 | ret = set_kconsumerd_sockets(); |
| 1597 | if (ret < 0) { |
| 1598 | goto error; |
| 1599 | } |
| 1600 | |
| 1601 | /* Setup kernel tracer */ |
| 1602 | init_kernel_tracer(); |
| 1603 | } else { |
| 1604 | if (strlen(apps_unix_sock_path) == 0) { |
| 1605 | snprintf(apps_unix_sock_path, PATH_MAX, |
| 1606 | DEFAULT_HOME_APPS_UNIX_SOCK, get_home_dir()); |
| 1607 | } |
| 1608 | |
| 1609 | /* Set the cli tool unix socket path */ |
| 1610 | if (strlen(client_unix_sock_path) == 0) { |
| 1611 | snprintf(client_unix_sock_path, PATH_MAX, |
| 1612 | DEFAULT_HOME_CLIENT_UNIX_SOCK, get_home_dir()); |
| 1613 | } |
| 1614 | } |
| 1615 | |
| 1616 | DBG("Client socket path %s", client_unix_sock_path); |
| 1617 | DBG("Application socket path %s", apps_unix_sock_path); |
| 1618 | |
| 1619 | /* See if daemon already exist. If any of the two |
| 1620 | * socket needed by the daemon are present, this test fails |
| 1621 | */ |
| 1622 | if ((ret = check_existing_daemon()) == 0) { |
| 1623 | ERR("Already running daemon.\n"); |
| 1624 | /* We do not goto error because we must not |
| 1625 | * cleanup() because a daemon is already running. |
| 1626 | */ |
| 1627 | exit(EXIT_FAILURE); |
| 1628 | } |
| 1629 | |
| 1630 | if (set_signal_handler() < 0) { |
| 1631 | goto error; |
| 1632 | } |
| 1633 | |
| 1634 | /* Setup the needed unix socket */ |
| 1635 | if (init_daemon_socket() < 0) { |
| 1636 | goto error; |
| 1637 | } |
| 1638 | |
| 1639 | /* Set credentials to socket */ |
| 1640 | if (is_root && (set_permissions() < 0)) { |
| 1641 | goto error; |
| 1642 | } |
| 1643 | |
| 1644 | /* Get parent pid if -S, --sig-parent is specified. */ |
| 1645 | if (opt_sig_parent) { |
| 1646 | ppid = getppid(); |
| 1647 | } |
| 1648 | |
| 1649 | while (1) { |
| 1650 | /* Create thread to manage the client socket */ |
| 1651 | ret = pthread_create(&client_thread, NULL, thread_manage_clients, (void *) NULL); |
| 1652 | if (ret != 0) { |
| 1653 | perror("pthread_create"); |
| 1654 | goto error; |
| 1655 | } |
| 1656 | |
| 1657 | /* Create thread to manage application socket */ |
| 1658 | ret = pthread_create(&apps_thread, NULL, thread_manage_apps, (void *) NULL); |
| 1659 | if (ret != 0) { |
| 1660 | perror("pthread_create"); |
| 1661 | goto error; |
| 1662 | } |
| 1663 | |
| 1664 | ret = pthread_join(client_thread, &status); |
| 1665 | if (ret != 0) { |
| 1666 | perror("pthread_join"); |
| 1667 | goto error; |
| 1668 | } |
| 1669 | } |
| 1670 | |
| 1671 | cleanup(); |
| 1672 | exit(EXIT_SUCCESS); |
| 1673 | |
| 1674 | error: |
| 1675 | cleanup(); |
| 1676 | exit(EXIT_FAILURE); |
| 1677 | } |