| 1 | /* |
| 2 | * Copyright (C) 2012 - Julien Desfossez <jdesfossez@efficios.com> |
| 3 | * David Goulet <dgoulet@efficios.com> |
| 4 | * |
| 5 | * This program is free software; you can redistribute it and/or modify |
| 6 | * it under the terms of the GNU General Public License, version 2 only, |
| 7 | * as published by the Free Software Foundation. |
| 8 | * |
| 9 | * This program is distributed in the hope that it will be useful, but WITHOUT |
| 10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for |
| 12 | * more details. |
| 13 | * |
| 14 | * You should have received a copy of the GNU General Public License along |
| 15 | * with this program; if not, write to the Free Software Foundation, Inc., |
| 16 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. |
| 17 | */ |
| 18 | |
| 19 | #define _GNU_SOURCE |
| 20 | #include <getopt.h> |
| 21 | #include <grp.h> |
| 22 | #include <limits.h> |
| 23 | #include <pthread.h> |
| 24 | #include <signal.h> |
| 25 | #include <stdio.h> |
| 26 | #include <stdlib.h> |
| 27 | #include <string.h> |
| 28 | #include <sys/mman.h> |
| 29 | #include <sys/mount.h> |
| 30 | #include <sys/resource.h> |
| 31 | #include <sys/socket.h> |
| 32 | #include <sys/stat.h> |
| 33 | #include <sys/types.h> |
| 34 | #include <sys/wait.h> |
| 35 | #include <inttypes.h> |
| 36 | #include <urcu/futex.h> |
| 37 | #include <urcu/uatomic.h> |
| 38 | #include <unistd.h> |
| 39 | #include <fcntl.h> |
| 40 | #include <config.h> |
| 41 | |
| 42 | #include <lttng/lttng.h> |
| 43 | #include <common/common.h> |
| 44 | #include <common/compat/poll.h> |
| 45 | #include <common/compat/socket.h> |
| 46 | #include <common/defaults.h> |
| 47 | #include <common/futex.h> |
| 48 | #include <common/sessiond-comm/sessiond-comm.h> |
| 49 | #include <common/sessiond-comm/inet.h> |
| 50 | #include <common/sessiond-comm/relayd.h> |
| 51 | #include <common/uri.h> |
| 52 | #include <common/utils.h> |
| 53 | |
| 54 | #include "cmd.h" |
| 55 | #include "ctf-trace.h" |
| 56 | #include "index.h" |
| 57 | #include "utils.h" |
| 58 | #include "lttng-relayd.h" |
| 59 | #include "live.h" |
| 60 | #include "health-relayd.h" |
| 61 | |
| 62 | /* command line options */ |
| 63 | char *opt_output_path; |
| 64 | static int opt_daemon; |
| 65 | static struct lttng_uri *control_uri; |
| 66 | static struct lttng_uri *data_uri; |
| 67 | static struct lttng_uri *live_uri; |
| 68 | |
| 69 | const char *progname; |
| 70 | |
| 71 | /* |
| 72 | * Quit pipe for all threads. This permits a single cancellation point |
| 73 | * for all threads when receiving an event on the pipe. |
| 74 | */ |
| 75 | static int thread_quit_pipe[2] = { -1, -1 }; |
| 76 | |
| 77 | /* |
| 78 | * This pipe is used to inform the worker thread that a command is queued and |
| 79 | * ready to be processed. |
| 80 | */ |
| 81 | static int relay_cmd_pipe[2] = { -1, -1 }; |
| 82 | |
| 83 | /* Shared between threads */ |
| 84 | static int dispatch_thread_exit; |
| 85 | |
| 86 | static pthread_t listener_thread; |
| 87 | static pthread_t dispatcher_thread; |
| 88 | static pthread_t worker_thread; |
| 89 | |
| 90 | static uint64_t last_relay_stream_id; |
| 91 | static uint64_t last_relay_session_id; |
| 92 | |
| 93 | /* |
| 94 | * Relay command queue. |
| 95 | * |
| 96 | * The relay_thread_listener and relay_thread_dispatcher communicate with this |
| 97 | * queue. |
| 98 | */ |
| 99 | static struct relay_cmd_queue relay_cmd_queue; |
| 100 | |
| 101 | /* buffer allocated at startup, used to store the trace data */ |
| 102 | static char *data_buffer; |
| 103 | static unsigned int data_buffer_size; |
| 104 | |
| 105 | /* We need those values for the file/dir creation. */ |
| 106 | static uid_t relayd_uid; |
| 107 | static gid_t relayd_gid; |
| 108 | |
| 109 | /* Global relay stream hash table. */ |
| 110 | struct lttng_ht *relay_streams_ht; |
| 111 | |
| 112 | /* Global relay viewer stream hash table. */ |
| 113 | struct lttng_ht *viewer_streams_ht; |
| 114 | |
| 115 | /* Global hash table that stores relay index object. */ |
| 116 | struct lttng_ht *indexes_ht; |
| 117 | |
| 118 | /* Relayd health monitoring */ |
| 119 | static struct health_app *health_relayd; |
| 120 | |
| 121 | /* |
| 122 | * usage function on stderr |
| 123 | */ |
| 124 | static |
| 125 | void usage(void) |
| 126 | { |
| 127 | fprintf(stderr, "Usage: %s OPTIONS\n\nOptions:\n", progname); |
| 128 | fprintf(stderr, " -h, --help Display this usage.\n"); |
| 129 | fprintf(stderr, " -d, --daemonize Start as a daemon.\n"); |
| 130 | fprintf(stderr, " -C, --control-port URL Control port listening.\n"); |
| 131 | fprintf(stderr, " -D, --data-port URL Data port listening.\n"); |
| 132 | fprintf(stderr, " -o, --output PATH Output path for traces. Must use an absolute path.\n"); |
| 133 | fprintf(stderr, " -v, --verbose Verbose mode. Activate DBG() macro.\n"); |
| 134 | } |
| 135 | |
| 136 | static |
| 137 | int parse_args(int argc, char **argv) |
| 138 | { |
| 139 | int c; |
| 140 | int ret = 0; |
| 141 | char *default_address; |
| 142 | |
| 143 | static struct option long_options[] = { |
| 144 | { "control-port", 1, 0, 'C', }, |
| 145 | { "data-port", 1, 0, 'D', }, |
| 146 | { "daemonize", 0, 0, 'd', }, |
| 147 | { "help", 0, 0, 'h', }, |
| 148 | { "output", 1, 0, 'o', }, |
| 149 | { "verbose", 0, 0, 'v', }, |
| 150 | { NULL, 0, 0, 0, }, |
| 151 | }; |
| 152 | |
| 153 | while (1) { |
| 154 | int option_index = 0; |
| 155 | c = getopt_long(argc, argv, "dhv" "C:D:o:", |
| 156 | long_options, &option_index); |
| 157 | if (c == -1) { |
| 158 | break; |
| 159 | } |
| 160 | |
| 161 | switch (c) { |
| 162 | case 0: |
| 163 | fprintf(stderr, "option %s", long_options[option_index].name); |
| 164 | if (optarg) { |
| 165 | fprintf(stderr, " with arg %s\n", optarg); |
| 166 | } |
| 167 | break; |
| 168 | case 'C': |
| 169 | ret = uri_parse(optarg, &control_uri); |
| 170 | if (ret < 0) { |
| 171 | ERR("Invalid control URI specified"); |
| 172 | goto exit; |
| 173 | } |
| 174 | if (control_uri->port == 0) { |
| 175 | control_uri->port = DEFAULT_NETWORK_CONTROL_PORT; |
| 176 | } |
| 177 | break; |
| 178 | case 'D': |
| 179 | ret = uri_parse(optarg, &data_uri); |
| 180 | if (ret < 0) { |
| 181 | ERR("Invalid data URI specified"); |
| 182 | goto exit; |
| 183 | } |
| 184 | if (data_uri->port == 0) { |
| 185 | data_uri->port = DEFAULT_NETWORK_DATA_PORT; |
| 186 | } |
| 187 | break; |
| 188 | case 'd': |
| 189 | opt_daemon = 1; |
| 190 | break; |
| 191 | case 'h': |
| 192 | usage(); |
| 193 | exit(EXIT_FAILURE); |
| 194 | case 'o': |
| 195 | ret = asprintf(&opt_output_path, "%s", optarg); |
| 196 | if (ret < 0) { |
| 197 | PERROR("asprintf opt_output_path"); |
| 198 | goto exit; |
| 199 | } |
| 200 | break; |
| 201 | case 'v': |
| 202 | /* Verbose level can increase using multiple -v */ |
| 203 | lttng_opt_verbose += 1; |
| 204 | break; |
| 205 | default: |
| 206 | /* Unknown option or other error. |
| 207 | * Error is printed by getopt, just return */ |
| 208 | ret = -1; |
| 209 | goto exit; |
| 210 | } |
| 211 | } |
| 212 | |
| 213 | /* assign default values */ |
| 214 | if (control_uri == NULL) { |
| 215 | ret = asprintf(&default_address, "tcp://0.0.0.0:%d", |
| 216 | DEFAULT_NETWORK_CONTROL_PORT); |
| 217 | if (ret < 0) { |
| 218 | PERROR("asprintf default data address"); |
| 219 | goto exit; |
| 220 | } |
| 221 | |
| 222 | ret = uri_parse(default_address, &control_uri); |
| 223 | free(default_address); |
| 224 | if (ret < 0) { |
| 225 | ERR("Invalid control URI specified"); |
| 226 | goto exit; |
| 227 | } |
| 228 | } |
| 229 | if (data_uri == NULL) { |
| 230 | ret = asprintf(&default_address, "tcp://0.0.0.0:%d", |
| 231 | DEFAULT_NETWORK_DATA_PORT); |
| 232 | if (ret < 0) { |
| 233 | PERROR("asprintf default data address"); |
| 234 | goto exit; |
| 235 | } |
| 236 | |
| 237 | ret = uri_parse(default_address, &data_uri); |
| 238 | free(default_address); |
| 239 | if (ret < 0) { |
| 240 | ERR("Invalid data URI specified"); |
| 241 | goto exit; |
| 242 | } |
| 243 | } |
| 244 | if (live_uri == NULL) { |
| 245 | ret = asprintf(&default_address, "tcp://0.0.0.0:%d", |
| 246 | DEFAULT_NETWORK_VIEWER_PORT); |
| 247 | if (ret < 0) { |
| 248 | PERROR("asprintf default viewer control address"); |
| 249 | goto exit; |
| 250 | } |
| 251 | |
| 252 | ret = uri_parse(default_address, &live_uri); |
| 253 | free(default_address); |
| 254 | if (ret < 0) { |
| 255 | ERR("Invalid viewer control URI specified"); |
| 256 | goto exit; |
| 257 | } |
| 258 | } |
| 259 | |
| 260 | exit: |
| 261 | return ret; |
| 262 | } |
| 263 | |
| 264 | /* |
| 265 | * Cleanup the daemon |
| 266 | */ |
| 267 | static |
| 268 | void cleanup(void) |
| 269 | { |
| 270 | DBG("Cleaning up"); |
| 271 | |
| 272 | /* free the dynamically allocated opt_output_path */ |
| 273 | free(opt_output_path); |
| 274 | |
| 275 | /* Close thread quit pipes */ |
| 276 | utils_close_pipe(thread_quit_pipe); |
| 277 | |
| 278 | uri_free(control_uri); |
| 279 | uri_free(data_uri); |
| 280 | } |
| 281 | |
| 282 | /* |
| 283 | * Write to writable pipe used to notify a thread. |
| 284 | */ |
| 285 | static |
| 286 | int notify_thread_pipe(int wpipe) |
| 287 | { |
| 288 | int ret; |
| 289 | |
| 290 | do { |
| 291 | ret = write(wpipe, "!", 1); |
| 292 | } while (ret < 0 && errno == EINTR); |
| 293 | if (ret < 0 || ret != 1) { |
| 294 | PERROR("write poll pipe"); |
| 295 | } |
| 296 | |
| 297 | return ret; |
| 298 | } |
| 299 | |
| 300 | /* |
| 301 | * Stop all threads by closing the thread quit pipe. |
| 302 | */ |
| 303 | static |
| 304 | void stop_threads(void) |
| 305 | { |
| 306 | int ret; |
| 307 | |
| 308 | /* Stopping all threads */ |
| 309 | DBG("Terminating all threads"); |
| 310 | ret = notify_thread_pipe(thread_quit_pipe[1]); |
| 311 | if (ret < 0) { |
| 312 | ERR("write error on thread quit pipe"); |
| 313 | } |
| 314 | |
| 315 | /* Dispatch thread */ |
| 316 | CMM_STORE_SHARED(dispatch_thread_exit, 1); |
| 317 | futex_nto1_wake(&relay_cmd_queue.futex); |
| 318 | } |
| 319 | |
| 320 | /* |
| 321 | * Signal handler for the daemon |
| 322 | * |
| 323 | * Simply stop all worker threads, leaving main() return gracefully after |
| 324 | * joining all threads and calling cleanup(). |
| 325 | */ |
| 326 | static |
| 327 | void sighandler(int sig) |
| 328 | { |
| 329 | switch (sig) { |
| 330 | case SIGPIPE: |
| 331 | DBG("SIGPIPE caught"); |
| 332 | return; |
| 333 | case SIGINT: |
| 334 | DBG("SIGINT caught"); |
| 335 | stop_threads(); |
| 336 | break; |
| 337 | case SIGTERM: |
| 338 | DBG("SIGTERM caught"); |
| 339 | stop_threads(); |
| 340 | break; |
| 341 | default: |
| 342 | break; |
| 343 | } |
| 344 | } |
| 345 | |
| 346 | /* |
| 347 | * Setup signal handler for : |
| 348 | * SIGINT, SIGTERM, SIGPIPE |
| 349 | */ |
| 350 | static |
| 351 | int set_signal_handler(void) |
| 352 | { |
| 353 | int ret = 0; |
| 354 | struct sigaction sa; |
| 355 | sigset_t sigset; |
| 356 | |
| 357 | if ((ret = sigemptyset(&sigset)) < 0) { |
| 358 | PERROR("sigemptyset"); |
| 359 | return ret; |
| 360 | } |
| 361 | |
| 362 | sa.sa_handler = sighandler; |
| 363 | sa.sa_mask = sigset; |
| 364 | sa.sa_flags = 0; |
| 365 | if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) { |
| 366 | PERROR("sigaction"); |
| 367 | return ret; |
| 368 | } |
| 369 | |
| 370 | if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) { |
| 371 | PERROR("sigaction"); |
| 372 | return ret; |
| 373 | } |
| 374 | |
| 375 | if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) { |
| 376 | PERROR("sigaction"); |
| 377 | return ret; |
| 378 | } |
| 379 | |
| 380 | DBG("Signal handler set for SIGTERM, SIGPIPE and SIGINT"); |
| 381 | |
| 382 | return ret; |
| 383 | } |
| 384 | |
| 385 | /* |
| 386 | * Init thread quit pipe. |
| 387 | * |
| 388 | * Return -1 on error or 0 if all pipes are created. |
| 389 | */ |
| 390 | static |
| 391 | int init_thread_quit_pipe(void) |
| 392 | { |
| 393 | int ret; |
| 394 | |
| 395 | ret = utils_create_pipe_cloexec(thread_quit_pipe); |
| 396 | |
| 397 | return ret; |
| 398 | } |
| 399 | |
| 400 | /* |
| 401 | * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set. |
| 402 | */ |
| 403 | static |
| 404 | int create_thread_poll_set(struct lttng_poll_event *events, int size) |
| 405 | { |
| 406 | int ret; |
| 407 | |
| 408 | if (events == NULL || size == 0) { |
| 409 | ret = -1; |
| 410 | goto error; |
| 411 | } |
| 412 | |
| 413 | ret = lttng_poll_create(events, size, LTTNG_CLOEXEC); |
| 414 | if (ret < 0) { |
| 415 | goto error; |
| 416 | } |
| 417 | |
| 418 | /* Add quit pipe */ |
| 419 | ret = lttng_poll_add(events, thread_quit_pipe[0], LPOLLIN); |
| 420 | if (ret < 0) { |
| 421 | goto error; |
| 422 | } |
| 423 | |
| 424 | return 0; |
| 425 | |
| 426 | error: |
| 427 | return ret; |
| 428 | } |
| 429 | |
| 430 | /* |
| 431 | * Check if the thread quit pipe was triggered. |
| 432 | * |
| 433 | * Return 1 if it was triggered else 0; |
| 434 | */ |
| 435 | static |
| 436 | int check_thread_quit_pipe(int fd, uint32_t events) |
| 437 | { |
| 438 | if (fd == thread_quit_pipe[0] && (events & LPOLLIN)) { |
| 439 | return 1; |
| 440 | } |
| 441 | |
| 442 | return 0; |
| 443 | } |
| 444 | |
| 445 | /* |
| 446 | * Create and init socket from uri. |
| 447 | */ |
| 448 | static |
| 449 | struct lttcomm_sock *relay_init_sock(struct lttng_uri *uri) |
| 450 | { |
| 451 | int ret; |
| 452 | struct lttcomm_sock *sock = NULL; |
| 453 | |
| 454 | sock = lttcomm_alloc_sock_from_uri(uri); |
| 455 | if (sock == NULL) { |
| 456 | ERR("Allocating socket"); |
| 457 | goto error; |
| 458 | } |
| 459 | |
| 460 | ret = lttcomm_create_sock(sock); |
| 461 | if (ret < 0) { |
| 462 | goto error; |
| 463 | } |
| 464 | DBG("Listening on sock %d", sock->fd); |
| 465 | |
| 466 | ret = sock->ops->bind(sock); |
| 467 | if (ret < 0) { |
| 468 | goto error; |
| 469 | } |
| 470 | |
| 471 | ret = sock->ops->listen(sock, -1); |
| 472 | if (ret < 0) { |
| 473 | goto error; |
| 474 | |
| 475 | } |
| 476 | |
| 477 | return sock; |
| 478 | |
| 479 | error: |
| 480 | if (sock) { |
| 481 | lttcomm_destroy_sock(sock); |
| 482 | } |
| 483 | return NULL; |
| 484 | } |
| 485 | |
| 486 | /* |
| 487 | * Return nonzero if stream needs to be closed. |
| 488 | */ |
| 489 | static |
| 490 | int close_stream_check(struct relay_stream *stream) |
| 491 | { |
| 492 | |
| 493 | if (stream->close_flag && stream->prev_seq == stream->last_net_seq_num) { |
| 494 | /* |
| 495 | * We are about to close the stream so set the data pending flag to 1 |
| 496 | * which will make the end data pending command skip the stream which |
| 497 | * is now closed and ready. Note that after proceeding to a file close, |
| 498 | * the written file is ready for reading. |
| 499 | */ |
| 500 | stream->data_pending_check_done = 1; |
| 501 | return 1; |
| 502 | } |
| 503 | return 0; |
| 504 | } |
| 505 | |
| 506 | /* |
| 507 | * This thread manages the listening for new connections on the network |
| 508 | */ |
| 509 | static |
| 510 | void *relay_thread_listener(void *data) |
| 511 | { |
| 512 | int i, ret, pollfd, err = -1; |
| 513 | int val = 1; |
| 514 | uint32_t revents, nb_fd; |
| 515 | struct lttng_poll_event events; |
| 516 | struct lttcomm_sock *control_sock, *data_sock; |
| 517 | |
| 518 | DBG("[thread] Relay listener started"); |
| 519 | |
| 520 | health_register(health_relayd, HEALTH_RELAYD_TYPE_LISTENER); |
| 521 | |
| 522 | health_code_update(); |
| 523 | |
| 524 | control_sock = relay_init_sock(control_uri); |
| 525 | if (!control_sock) { |
| 526 | goto error_sock_control; |
| 527 | } |
| 528 | |
| 529 | data_sock = relay_init_sock(data_uri); |
| 530 | if (!data_sock) { |
| 531 | goto error_sock_relay; |
| 532 | } |
| 533 | |
| 534 | /* |
| 535 | * Pass 3 as size here for the thread quit pipe, control and data socket. |
| 536 | */ |
| 537 | ret = create_thread_poll_set(&events, 3); |
| 538 | if (ret < 0) { |
| 539 | goto error_create_poll; |
| 540 | } |
| 541 | |
| 542 | /* Add the control socket */ |
| 543 | ret = lttng_poll_add(&events, control_sock->fd, LPOLLIN | LPOLLRDHUP); |
| 544 | if (ret < 0) { |
| 545 | goto error_poll_add; |
| 546 | } |
| 547 | |
| 548 | /* Add the data socket */ |
| 549 | ret = lttng_poll_add(&events, data_sock->fd, LPOLLIN | LPOLLRDHUP); |
| 550 | if (ret < 0) { |
| 551 | goto error_poll_add; |
| 552 | } |
| 553 | |
| 554 | while (1) { |
| 555 | health_code_update(); |
| 556 | |
| 557 | DBG("Listener accepting connections"); |
| 558 | |
| 559 | restart: |
| 560 | health_poll_entry(); |
| 561 | ret = lttng_poll_wait(&events, -1); |
| 562 | health_poll_exit(); |
| 563 | if (ret < 0) { |
| 564 | /* |
| 565 | * Restart interrupted system call. |
| 566 | */ |
| 567 | if (errno == EINTR) { |
| 568 | goto restart; |
| 569 | } |
| 570 | goto error; |
| 571 | } |
| 572 | |
| 573 | nb_fd = ret; |
| 574 | |
| 575 | DBG("Relay new connection received"); |
| 576 | for (i = 0; i < nb_fd; i++) { |
| 577 | health_code_update(); |
| 578 | |
| 579 | /* Fetch once the poll data */ |
| 580 | revents = LTTNG_POLL_GETEV(&events, i); |
| 581 | pollfd = LTTNG_POLL_GETFD(&events, i); |
| 582 | |
| 583 | /* Thread quit pipe has been closed. Killing thread. */ |
| 584 | ret = check_thread_quit_pipe(pollfd, revents); |
| 585 | if (ret) { |
| 586 | err = 0; |
| 587 | goto exit; |
| 588 | } |
| 589 | |
| 590 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { |
| 591 | ERR("socket poll error"); |
| 592 | goto error; |
| 593 | } else if (revents & LPOLLIN) { |
| 594 | /* |
| 595 | * Get allocated in this thread, |
| 596 | * enqueued to a global queue, dequeued |
| 597 | * and freed in the worker thread. |
| 598 | */ |
| 599 | struct relay_command *relay_cmd; |
| 600 | struct lttcomm_sock *newsock; |
| 601 | |
| 602 | relay_cmd = zmalloc(sizeof(struct relay_command)); |
| 603 | if (relay_cmd == NULL) { |
| 604 | PERROR("relay command zmalloc"); |
| 605 | goto error; |
| 606 | } |
| 607 | |
| 608 | if (pollfd == data_sock->fd) { |
| 609 | newsock = data_sock->ops->accept(data_sock); |
| 610 | if (!newsock) { |
| 611 | PERROR("accepting data sock"); |
| 612 | free(relay_cmd); |
| 613 | goto error; |
| 614 | } |
| 615 | relay_cmd->type = RELAY_DATA; |
| 616 | DBG("Relay data connection accepted, socket %d", newsock->fd); |
| 617 | } else { |
| 618 | assert(pollfd == control_sock->fd); |
| 619 | newsock = control_sock->ops->accept(control_sock); |
| 620 | if (!newsock) { |
| 621 | PERROR("accepting control sock"); |
| 622 | free(relay_cmd); |
| 623 | goto error; |
| 624 | } |
| 625 | relay_cmd->type = RELAY_CONTROL; |
| 626 | DBG("Relay control connection accepted, socket %d", newsock->fd); |
| 627 | } |
| 628 | ret = setsockopt(newsock->fd, SOL_SOCKET, SO_REUSEADDR, |
| 629 | &val, sizeof(int)); |
| 630 | if (ret < 0) { |
| 631 | PERROR("setsockopt inet"); |
| 632 | lttcomm_destroy_sock(newsock); |
| 633 | free(relay_cmd); |
| 634 | goto error; |
| 635 | } |
| 636 | relay_cmd->sock = newsock; |
| 637 | /* |
| 638 | * Lock free enqueue the request. |
| 639 | */ |
| 640 | cds_wfq_enqueue(&relay_cmd_queue.queue, &relay_cmd->node); |
| 641 | |
| 642 | /* |
| 643 | * Wake the dispatch queue futex. Implicit memory |
| 644 | * barrier with the exchange in cds_wfq_enqueue. |
| 645 | */ |
| 646 | futex_nto1_wake(&relay_cmd_queue.futex); |
| 647 | } |
| 648 | } |
| 649 | } |
| 650 | |
| 651 | exit: |
| 652 | error: |
| 653 | error_poll_add: |
| 654 | lttng_poll_clean(&events); |
| 655 | error_create_poll: |
| 656 | if (data_sock->fd >= 0) { |
| 657 | ret = data_sock->ops->close(data_sock); |
| 658 | if (ret) { |
| 659 | PERROR("close"); |
| 660 | } |
| 661 | } |
| 662 | lttcomm_destroy_sock(data_sock); |
| 663 | error_sock_relay: |
| 664 | if (control_sock->fd >= 0) { |
| 665 | ret = control_sock->ops->close(control_sock); |
| 666 | if (ret) { |
| 667 | PERROR("close"); |
| 668 | } |
| 669 | } |
| 670 | lttcomm_destroy_sock(control_sock); |
| 671 | error_sock_control: |
| 672 | if (err) { |
| 673 | health_error(); |
| 674 | ERR("Health error occurred in %s", __func__); |
| 675 | } |
| 676 | health_unregister(health_relayd); |
| 677 | DBG("Relay listener thread cleanup complete"); |
| 678 | stop_threads(); |
| 679 | return NULL; |
| 680 | } |
| 681 | |
| 682 | /* |
| 683 | * This thread manages the dispatching of the requests to worker threads |
| 684 | */ |
| 685 | static |
| 686 | void *relay_thread_dispatcher(void *data) |
| 687 | { |
| 688 | int ret, err = -1; |
| 689 | struct cds_wfq_node *node; |
| 690 | struct relay_command *relay_cmd = NULL; |
| 691 | |
| 692 | DBG("[thread] Relay dispatcher started"); |
| 693 | |
| 694 | health_register(health_relayd, HEALTH_RELAYD_TYPE_DISPATCHER); |
| 695 | |
| 696 | health_code_update(); |
| 697 | |
| 698 | while (!CMM_LOAD_SHARED(dispatch_thread_exit)) { |
| 699 | health_code_update(); |
| 700 | |
| 701 | /* Atomically prepare the queue futex */ |
| 702 | futex_nto1_prepare(&relay_cmd_queue.futex); |
| 703 | |
| 704 | do { |
| 705 | health_code_update(); |
| 706 | |
| 707 | /* Dequeue commands */ |
| 708 | node = cds_wfq_dequeue_blocking(&relay_cmd_queue.queue); |
| 709 | if (node == NULL) { |
| 710 | DBG("Woken up but nothing in the relay command queue"); |
| 711 | /* Continue thread execution */ |
| 712 | break; |
| 713 | } |
| 714 | |
| 715 | relay_cmd = caa_container_of(node, struct relay_command, node); |
| 716 | DBG("Dispatching request waiting on sock %d", relay_cmd->sock->fd); |
| 717 | |
| 718 | /* |
| 719 | * Inform worker thread of the new request. This |
| 720 | * call is blocking so we can be assured that the data will be read |
| 721 | * at some point in time or wait to the end of the world :) |
| 722 | */ |
| 723 | do { |
| 724 | ret = write(relay_cmd_pipe[1], relay_cmd, |
| 725 | sizeof(struct relay_command)); |
| 726 | } while (ret < 0 && errno == EINTR); |
| 727 | free(relay_cmd); |
| 728 | if (ret < 0 || ret != sizeof(struct relay_command)) { |
| 729 | PERROR("write cmd pipe"); |
| 730 | goto error; |
| 731 | } |
| 732 | } while (node != NULL); |
| 733 | |
| 734 | /* Futex wait on queue. Blocking call on futex() */ |
| 735 | health_poll_entry(); |
| 736 | futex_nto1_wait(&relay_cmd_queue.futex); |
| 737 | health_poll_exit(); |
| 738 | } |
| 739 | |
| 740 | /* Normal exit, no error */ |
| 741 | err = 0; |
| 742 | |
| 743 | error: |
| 744 | if (err) { |
| 745 | health_error(); |
| 746 | ERR("Health error occurred in %s", __func__); |
| 747 | } |
| 748 | health_unregister(health_relayd); |
| 749 | DBG("Dispatch thread dying"); |
| 750 | stop_threads(); |
| 751 | return NULL; |
| 752 | } |
| 753 | |
| 754 | /* |
| 755 | * Get stream from stream id. |
| 756 | * Need to be called with RCU read-side lock held. |
| 757 | */ |
| 758 | struct relay_stream *relay_stream_find_by_id(uint64_t stream_id) |
| 759 | { |
| 760 | struct lttng_ht_node_ulong *node; |
| 761 | struct lttng_ht_iter iter; |
| 762 | struct relay_stream *ret; |
| 763 | |
| 764 | lttng_ht_lookup(relay_streams_ht, |
| 765 | (void *)((unsigned long) stream_id), |
| 766 | &iter); |
| 767 | node = lttng_ht_iter_get_node_ulong(&iter); |
| 768 | if (node == NULL) { |
| 769 | DBG("Relay stream %" PRIu64 " not found", stream_id); |
| 770 | ret = NULL; |
| 771 | goto end; |
| 772 | } |
| 773 | |
| 774 | ret = caa_container_of(node, struct relay_stream, stream_n); |
| 775 | |
| 776 | end: |
| 777 | return ret; |
| 778 | } |
| 779 | |
| 780 | static |
| 781 | void deferred_free_stream(struct rcu_head *head) |
| 782 | { |
| 783 | struct relay_stream *stream = |
| 784 | caa_container_of(head, struct relay_stream, rcu_node); |
| 785 | |
| 786 | ctf_trace_try_destroy(stream->ctf_trace); |
| 787 | |
| 788 | free(stream->path_name); |
| 789 | free(stream->channel_name); |
| 790 | free(stream); |
| 791 | } |
| 792 | |
| 793 | static |
| 794 | void deferred_free_session(struct rcu_head *head) |
| 795 | { |
| 796 | struct relay_session *session = |
| 797 | caa_container_of(head, struct relay_session, rcu_node); |
| 798 | free(session); |
| 799 | } |
| 800 | |
| 801 | /* |
| 802 | * Close a given stream. The stream is freed using a call RCU. |
| 803 | * |
| 804 | * RCU read side lock MUST be acquired. If NO close_stream_check() was called |
| 805 | * BEFORE the stream lock MUST be acquired. |
| 806 | */ |
| 807 | static void destroy_stream(struct relay_stream *stream, |
| 808 | struct lttng_ht *ctf_traces_ht) |
| 809 | { |
| 810 | int delret; |
| 811 | struct relay_viewer_stream *vstream; |
| 812 | struct lttng_ht_iter iter; |
| 813 | |
| 814 | assert(stream); |
| 815 | |
| 816 | delret = close(stream->fd); |
| 817 | if (delret < 0) { |
| 818 | PERROR("close stream"); |
| 819 | } |
| 820 | |
| 821 | if (stream->index_fd >= 0) { |
| 822 | delret = close(stream->index_fd); |
| 823 | if (delret < 0) { |
| 824 | PERROR("close stream index_fd"); |
| 825 | } |
| 826 | } |
| 827 | |
| 828 | vstream = live_find_viewer_stream_by_id(stream->stream_handle); |
| 829 | if (vstream) { |
| 830 | /* |
| 831 | * Set the last good value into the viewer stream. This is done |
| 832 | * right before the stream gets deleted from the hash table. The |
| 833 | * lookup failure on the live thread side of a stream indicates |
| 834 | * that the viewer stream index received value should be used. |
| 835 | */ |
| 836 | vstream->total_index_received = stream->total_index_received; |
| 837 | } |
| 838 | |
| 839 | /* Cleanup index of that stream. */ |
| 840 | relay_index_destroy_by_stream_id(stream->stream_handle); |
| 841 | |
| 842 | iter.iter.node = &stream->stream_n.node; |
| 843 | delret = lttng_ht_del(relay_streams_ht, &iter); |
| 844 | assert(!delret); |
| 845 | iter.iter.node = &stream->ctf_trace_node.node; |
| 846 | delret = lttng_ht_del(ctf_traces_ht, &iter); |
| 847 | assert(!delret); |
| 848 | call_rcu(&stream->rcu_node, deferred_free_stream); |
| 849 | DBG("Closed tracefile %d from close stream", stream->fd); |
| 850 | } |
| 851 | |
| 852 | /* |
| 853 | * relay_delete_session: Free all memory associated with a session and |
| 854 | * close all the FDs |
| 855 | */ |
| 856 | static |
| 857 | void relay_delete_session(struct relay_command *cmd, |
| 858 | struct lttng_ht *sessions_ht) |
| 859 | { |
| 860 | struct lttng_ht_iter iter; |
| 861 | struct lttng_ht_node_ulong *node; |
| 862 | struct relay_stream *stream; |
| 863 | int ret; |
| 864 | |
| 865 | if (!cmd->session) { |
| 866 | return; |
| 867 | } |
| 868 | |
| 869 | DBG("Relay deleting session %" PRIu64, cmd->session->id); |
| 870 | |
| 871 | rcu_read_lock(); |
| 872 | cds_lfht_for_each_entry(relay_streams_ht->ht, &iter.iter, node, node) { |
| 873 | node = lttng_ht_iter_get_node_ulong(&iter); |
| 874 | if (!node) { |
| 875 | continue; |
| 876 | } |
| 877 | stream = caa_container_of(node, struct relay_stream, stream_n); |
| 878 | if (stream->session == cmd->session) { |
| 879 | destroy_stream(stream, cmd->ctf_traces_ht); |
| 880 | } |
| 881 | } |
| 882 | |
| 883 | /* Make this session not visible anymore. */ |
| 884 | iter.iter.node = &cmd->session->session_n.node; |
| 885 | ret = lttng_ht_del(sessions_ht, &iter); |
| 886 | assert(!ret); |
| 887 | call_rcu(&cmd->session->rcu_node, deferred_free_session); |
| 888 | rcu_read_unlock(); |
| 889 | } |
| 890 | |
| 891 | /* |
| 892 | * Copy index data from the control port to a given index object. |
| 893 | */ |
| 894 | static void copy_index_control_data(struct relay_index *index, |
| 895 | struct lttcomm_relayd_index *data) |
| 896 | { |
| 897 | assert(index); |
| 898 | assert(data); |
| 899 | |
| 900 | /* |
| 901 | * The index on disk is encoded in big endian, so we don't need to convert |
| 902 | * the data received on the network. The data_offset value is NEVER |
| 903 | * modified here and is updated by the data thread. |
| 904 | */ |
| 905 | index->index_data.packet_size = data->packet_size; |
| 906 | index->index_data.content_size = data->content_size; |
| 907 | index->index_data.timestamp_begin = data->timestamp_begin; |
| 908 | index->index_data.timestamp_end = data->timestamp_end; |
| 909 | index->index_data.events_discarded = data->events_discarded; |
| 910 | index->index_data.stream_id = data->stream_id; |
| 911 | } |
| 912 | |
| 913 | /* |
| 914 | * Handle the RELAYD_CREATE_SESSION command. |
| 915 | * |
| 916 | * On success, send back the session id or else return a negative value. |
| 917 | */ |
| 918 | static |
| 919 | int relay_create_session(struct lttcomm_relayd_hdr *recv_hdr, |
| 920 | struct relay_command *cmd, |
| 921 | struct lttng_ht *sessions_ht) |
| 922 | { |
| 923 | int ret = 0, send_ret; |
| 924 | struct relay_session *session; |
| 925 | struct lttcomm_relayd_status_session reply; |
| 926 | |
| 927 | assert(recv_hdr); |
| 928 | assert(cmd); |
| 929 | |
| 930 | memset(&reply, 0, sizeof(reply)); |
| 931 | |
| 932 | session = zmalloc(sizeof(struct relay_session)); |
| 933 | if (session == NULL) { |
| 934 | PERROR("relay session zmalloc"); |
| 935 | ret = -1; |
| 936 | goto error; |
| 937 | } |
| 938 | |
| 939 | session->id = ++last_relay_session_id; |
| 940 | session->sock = cmd->sock; |
| 941 | session->minor = cmd->minor; |
| 942 | session->major = cmd->major; |
| 943 | cmd->session = session; |
| 944 | |
| 945 | reply.session_id = htobe64(session->id); |
| 946 | |
| 947 | switch (cmd->minor) { |
| 948 | case 4: /* LTTng sessiond 2.4 */ |
| 949 | default: |
| 950 | ret = cmd_create_session_2_4(cmd, session); |
| 951 | break; |
| 952 | } |
| 953 | |
| 954 | lttng_ht_node_init_ulong(&session->session_n, |
| 955 | (unsigned long) session->id); |
| 956 | lttng_ht_add_unique_ulong(sessions_ht, |
| 957 | &session->session_n); |
| 958 | |
| 959 | DBG("Created session %" PRIu64, session->id); |
| 960 | |
| 961 | error: |
| 962 | if (ret < 0) { |
| 963 | reply.ret_code = htobe32(LTTNG_ERR_FATAL); |
| 964 | } else { |
| 965 | reply.ret_code = htobe32(LTTNG_OK); |
| 966 | } |
| 967 | |
| 968 | send_ret = cmd->sock->ops->sendmsg(cmd->sock, &reply, sizeof(reply), 0); |
| 969 | if (send_ret < 0) { |
| 970 | ERR("Relayd sending session id"); |
| 971 | ret = send_ret; |
| 972 | } |
| 973 | |
| 974 | return ret; |
| 975 | } |
| 976 | |
| 977 | /* |
| 978 | * relay_add_stream: allocate a new stream for a session |
| 979 | */ |
| 980 | static |
| 981 | int relay_add_stream(struct lttcomm_relayd_hdr *recv_hdr, |
| 982 | struct relay_command *cmd, struct lttng_ht *sessions_ht) |
| 983 | { |
| 984 | struct relay_session *session = cmd->session; |
| 985 | struct relay_stream *stream = NULL; |
| 986 | struct lttcomm_relayd_status_stream reply; |
| 987 | int ret, send_ret; |
| 988 | |
| 989 | if (!session || cmd->version_check_done == 0) { |
| 990 | ERR("Trying to add a stream before version check"); |
| 991 | ret = -1; |
| 992 | goto end_no_session; |
| 993 | } |
| 994 | |
| 995 | stream = zmalloc(sizeof(struct relay_stream)); |
| 996 | if (stream == NULL) { |
| 997 | PERROR("relay stream zmalloc"); |
| 998 | ret = -1; |
| 999 | goto end_no_session; |
| 1000 | } |
| 1001 | |
| 1002 | switch (cmd->minor) { |
| 1003 | case 1: /* LTTng sessiond 2.1 */ |
| 1004 | ret = cmd_recv_stream_2_1(cmd, stream); |
| 1005 | break; |
| 1006 | case 2: /* LTTng sessiond 2.2 */ |
| 1007 | default: |
| 1008 | ret = cmd_recv_stream_2_2(cmd, stream); |
| 1009 | break; |
| 1010 | } |
| 1011 | if (ret < 0) { |
| 1012 | goto err_free_stream; |
| 1013 | } |
| 1014 | |
| 1015 | rcu_read_lock(); |
| 1016 | stream->stream_handle = ++last_relay_stream_id; |
| 1017 | stream->prev_seq = -1ULL; |
| 1018 | stream->session = session; |
| 1019 | stream->index_fd = -1; |
| 1020 | stream->read_index_fd = -1; |
| 1021 | stream->ctf_trace = NULL; |
| 1022 | pthread_mutex_init(&stream->lock, NULL); |
| 1023 | |
| 1024 | ret = utils_mkdir_recursive(stream->path_name, S_IRWXU | S_IRWXG); |
| 1025 | if (ret < 0) { |
| 1026 | ERR("relay creating output directory"); |
| 1027 | goto end; |
| 1028 | } |
| 1029 | |
| 1030 | /* |
| 1031 | * No need to use run_as API here because whatever we receives, the relayd |
| 1032 | * uses its own credentials for the stream files. |
| 1033 | */ |
| 1034 | ret = utils_create_stream_file(stream->path_name, stream->channel_name, |
| 1035 | stream->tracefile_size, 0, relayd_uid, relayd_gid, NULL); |
| 1036 | if (ret < 0) { |
| 1037 | ERR("Create output file"); |
| 1038 | goto end; |
| 1039 | } |
| 1040 | stream->fd = ret; |
| 1041 | if (stream->tracefile_size) { |
| 1042 | DBG("Tracefile %s/%s_0 created", stream->path_name, stream->channel_name); |
| 1043 | } else { |
| 1044 | DBG("Tracefile %s/%s created", stream->path_name, stream->channel_name); |
| 1045 | } |
| 1046 | |
| 1047 | if (!strncmp(stream->channel_name, DEFAULT_METADATA_NAME, NAME_MAX)) { |
| 1048 | stream->metadata_flag = 1; |
| 1049 | /* |
| 1050 | * When we receive a new metadata stream, we create a new |
| 1051 | * ctf_trace and we assign this ctf_trace to all streams with |
| 1052 | * the same path. |
| 1053 | * |
| 1054 | * If later on we receive a new stream for the same ctf_trace, |
| 1055 | * we copy the information from the first hit in the HT to the |
| 1056 | * new stream. |
| 1057 | */ |
| 1058 | stream->ctf_trace = ctf_trace_create(); |
| 1059 | if (!stream->ctf_trace) { |
| 1060 | ret = -1; |
| 1061 | goto end; |
| 1062 | } |
| 1063 | stream->ctf_trace->refcount++; |
| 1064 | stream->ctf_trace->metadata_stream = stream; |
| 1065 | } |
| 1066 | ctf_trace_assign(cmd->ctf_traces_ht, stream); |
| 1067 | |
| 1068 | lttng_ht_node_init_ulong(&stream->stream_n, |
| 1069 | (unsigned long) stream->stream_handle); |
| 1070 | lttng_ht_add_unique_ulong(relay_streams_ht, |
| 1071 | &stream->stream_n); |
| 1072 | |
| 1073 | lttng_ht_node_init_str(&stream->ctf_trace_node, stream->path_name); |
| 1074 | lttng_ht_add_str(cmd->ctf_traces_ht, &stream->ctf_trace_node); |
| 1075 | |
| 1076 | DBG("Relay new stream added %s with ID %" PRIu64, stream->channel_name, |
| 1077 | stream->stream_handle); |
| 1078 | |
| 1079 | end: |
| 1080 | reply.handle = htobe64(stream->stream_handle); |
| 1081 | /* send the session id to the client or a negative return code on error */ |
| 1082 | if (ret < 0) { |
| 1083 | reply.ret_code = htobe32(LTTNG_ERR_UNK); |
| 1084 | /* stream was not properly added to the ht, so free it */ |
| 1085 | free(stream); |
| 1086 | } else { |
| 1087 | reply.ret_code = htobe32(LTTNG_OK); |
| 1088 | } |
| 1089 | |
| 1090 | send_ret = cmd->sock->ops->sendmsg(cmd->sock, &reply, |
| 1091 | sizeof(struct lttcomm_relayd_status_stream), 0); |
| 1092 | if (send_ret < 0) { |
| 1093 | ERR("Relay sending stream id"); |
| 1094 | ret = send_ret; |
| 1095 | } |
| 1096 | rcu_read_unlock(); |
| 1097 | |
| 1098 | end_no_session: |
| 1099 | return ret; |
| 1100 | |
| 1101 | err_free_stream: |
| 1102 | free(stream->path_name); |
| 1103 | free(stream->channel_name); |
| 1104 | free(stream); |
| 1105 | return ret; |
| 1106 | } |
| 1107 | |
| 1108 | /* |
| 1109 | * relay_close_stream: close a specific stream |
| 1110 | */ |
| 1111 | static |
| 1112 | int relay_close_stream(struct lttcomm_relayd_hdr *recv_hdr, |
| 1113 | struct relay_command *cmd) |
| 1114 | { |
| 1115 | int ret, send_ret; |
| 1116 | struct relay_session *session = cmd->session; |
| 1117 | struct lttcomm_relayd_close_stream stream_info; |
| 1118 | struct lttcomm_relayd_generic_reply reply; |
| 1119 | struct relay_stream *stream; |
| 1120 | |
| 1121 | DBG("Close stream received"); |
| 1122 | |
| 1123 | if (!session || cmd->version_check_done == 0) { |
| 1124 | ERR("Trying to close a stream before version check"); |
| 1125 | ret = -1; |
| 1126 | goto end_no_session; |
| 1127 | } |
| 1128 | |
| 1129 | ret = cmd->sock->ops->recvmsg(cmd->sock, &stream_info, |
| 1130 | sizeof(struct lttcomm_relayd_close_stream), 0); |
| 1131 | if (ret < sizeof(struct lttcomm_relayd_close_stream)) { |
| 1132 | if (ret == 0) { |
| 1133 | /* Orderly shutdown. Not necessary to print an error. */ |
| 1134 | DBG("Socket %d did an orderly shutdown", cmd->sock->fd); |
| 1135 | } else { |
| 1136 | ERR("Relay didn't receive valid add_stream struct size : %d", ret); |
| 1137 | } |
| 1138 | ret = -1; |
| 1139 | goto end_no_session; |
| 1140 | } |
| 1141 | |
| 1142 | rcu_read_lock(); |
| 1143 | stream = relay_stream_find_by_id(be64toh(stream_info.stream_id)); |
| 1144 | if (!stream) { |
| 1145 | ret = -1; |
| 1146 | goto end_unlock; |
| 1147 | } |
| 1148 | |
| 1149 | stream->last_net_seq_num = be64toh(stream_info.last_net_seq_num); |
| 1150 | stream->close_flag = 1; |
| 1151 | |
| 1152 | if (close_stream_check(stream)) { |
| 1153 | destroy_stream(stream, cmd->ctf_traces_ht); |
| 1154 | } |
| 1155 | |
| 1156 | end_unlock: |
| 1157 | rcu_read_unlock(); |
| 1158 | |
| 1159 | if (ret < 0) { |
| 1160 | reply.ret_code = htobe32(LTTNG_ERR_UNK); |
| 1161 | } else { |
| 1162 | reply.ret_code = htobe32(LTTNG_OK); |
| 1163 | } |
| 1164 | send_ret = cmd->sock->ops->sendmsg(cmd->sock, &reply, |
| 1165 | sizeof(struct lttcomm_relayd_generic_reply), 0); |
| 1166 | if (send_ret < 0) { |
| 1167 | ERR("Relay sending stream id"); |
| 1168 | ret = send_ret; |
| 1169 | } |
| 1170 | |
| 1171 | end_no_session: |
| 1172 | return ret; |
| 1173 | } |
| 1174 | |
| 1175 | /* |
| 1176 | * relay_unknown_command: send -1 if received unknown command |
| 1177 | */ |
| 1178 | static |
| 1179 | void relay_unknown_command(struct relay_command *cmd) |
| 1180 | { |
| 1181 | struct lttcomm_relayd_generic_reply reply; |
| 1182 | int ret; |
| 1183 | |
| 1184 | reply.ret_code = htobe32(LTTNG_ERR_UNK); |
| 1185 | ret = cmd->sock->ops->sendmsg(cmd->sock, &reply, |
| 1186 | sizeof(struct lttcomm_relayd_generic_reply), 0); |
| 1187 | if (ret < 0) { |
| 1188 | ERR("Relay sending unknown command"); |
| 1189 | } |
| 1190 | } |
| 1191 | |
| 1192 | /* |
| 1193 | * relay_start: send an acknowledgment to the client to tell if we are |
| 1194 | * ready to receive data. We are ready if a session is established. |
| 1195 | */ |
| 1196 | static |
| 1197 | int relay_start(struct lttcomm_relayd_hdr *recv_hdr, |
| 1198 | struct relay_command *cmd) |
| 1199 | { |
| 1200 | int ret = htobe32(LTTNG_OK); |
| 1201 | struct lttcomm_relayd_generic_reply reply; |
| 1202 | struct relay_session *session = cmd->session; |
| 1203 | |
| 1204 | if (!session) { |
| 1205 | DBG("Trying to start the streaming without a session established"); |
| 1206 | ret = htobe32(LTTNG_ERR_UNK); |
| 1207 | } |
| 1208 | |
| 1209 | reply.ret_code = ret; |
| 1210 | ret = cmd->sock->ops->sendmsg(cmd->sock, &reply, |
| 1211 | sizeof(struct lttcomm_relayd_generic_reply), 0); |
| 1212 | if (ret < 0) { |
| 1213 | ERR("Relay sending start ack"); |
| 1214 | } |
| 1215 | |
| 1216 | return ret; |
| 1217 | } |
| 1218 | |
| 1219 | /* |
| 1220 | * Append padding to the file pointed by the file descriptor fd. |
| 1221 | */ |
| 1222 | static int write_padding_to_file(int fd, uint32_t size) |
| 1223 | { |
| 1224 | int ret = 0; |
| 1225 | char *zeros; |
| 1226 | |
| 1227 | if (size == 0) { |
| 1228 | goto end; |
| 1229 | } |
| 1230 | |
| 1231 | zeros = zmalloc(size); |
| 1232 | if (zeros == NULL) { |
| 1233 | PERROR("zmalloc zeros for padding"); |
| 1234 | ret = -1; |
| 1235 | goto end; |
| 1236 | } |
| 1237 | |
| 1238 | do { |
| 1239 | ret = write(fd, zeros, size); |
| 1240 | } while (ret < 0 && errno == EINTR); |
| 1241 | if (ret < 0 || ret != size) { |
| 1242 | PERROR("write padding to file"); |
| 1243 | } |
| 1244 | |
| 1245 | free(zeros); |
| 1246 | |
| 1247 | end: |
| 1248 | return ret; |
| 1249 | } |
| 1250 | |
| 1251 | /* |
| 1252 | * relay_recv_metadata: receive the metada for the session. |
| 1253 | */ |
| 1254 | static |
| 1255 | int relay_recv_metadata(struct lttcomm_relayd_hdr *recv_hdr, |
| 1256 | struct relay_command *cmd) |
| 1257 | { |
| 1258 | int ret = htobe32(LTTNG_OK); |
| 1259 | struct relay_session *session = cmd->session; |
| 1260 | struct lttcomm_relayd_metadata_payload *metadata_struct; |
| 1261 | struct relay_stream *metadata_stream; |
| 1262 | uint64_t data_size, payload_size; |
| 1263 | |
| 1264 | if (!session) { |
| 1265 | ERR("Metadata sent before version check"); |
| 1266 | ret = -1; |
| 1267 | goto end; |
| 1268 | } |
| 1269 | |
| 1270 | data_size = payload_size = be64toh(recv_hdr->data_size); |
| 1271 | if (data_size < sizeof(struct lttcomm_relayd_metadata_payload)) { |
| 1272 | ERR("Incorrect data size"); |
| 1273 | ret = -1; |
| 1274 | goto end; |
| 1275 | } |
| 1276 | payload_size -= sizeof(struct lttcomm_relayd_metadata_payload); |
| 1277 | |
| 1278 | if (data_buffer_size < data_size) { |
| 1279 | /* In case the realloc fails, we can free the memory */ |
| 1280 | char *tmp_data_ptr; |
| 1281 | |
| 1282 | tmp_data_ptr = realloc(data_buffer, data_size); |
| 1283 | if (!tmp_data_ptr) { |
| 1284 | ERR("Allocating data buffer"); |
| 1285 | free(data_buffer); |
| 1286 | ret = -1; |
| 1287 | goto end; |
| 1288 | } |
| 1289 | data_buffer = tmp_data_ptr; |
| 1290 | data_buffer_size = data_size; |
| 1291 | } |
| 1292 | memset(data_buffer, 0, data_size); |
| 1293 | DBG2("Relay receiving metadata, waiting for %" PRIu64 " bytes", data_size); |
| 1294 | ret = cmd->sock->ops->recvmsg(cmd->sock, data_buffer, data_size, 0); |
| 1295 | if (ret < 0 || ret != data_size) { |
| 1296 | if (ret == 0) { |
| 1297 | /* Orderly shutdown. Not necessary to print an error. */ |
| 1298 | DBG("Socket %d did an orderly shutdown", cmd->sock->fd); |
| 1299 | } else { |
| 1300 | ERR("Relay didn't receive the whole metadata"); |
| 1301 | } |
| 1302 | ret = -1; |
| 1303 | goto end; |
| 1304 | } |
| 1305 | metadata_struct = (struct lttcomm_relayd_metadata_payload *) data_buffer; |
| 1306 | |
| 1307 | rcu_read_lock(); |
| 1308 | metadata_stream = relay_stream_find_by_id( |
| 1309 | be64toh(metadata_struct->stream_id)); |
| 1310 | if (!metadata_stream) { |
| 1311 | ret = -1; |
| 1312 | goto end_unlock; |
| 1313 | } |
| 1314 | |
| 1315 | do { |
| 1316 | ret = write(metadata_stream->fd, metadata_struct->payload, |
| 1317 | payload_size); |
| 1318 | } while (ret < 0 && errno == EINTR); |
| 1319 | if (ret < 0 || ret != payload_size) { |
| 1320 | ERR("Relay error writing metadata on file"); |
| 1321 | ret = -1; |
| 1322 | goto end_unlock; |
| 1323 | } |
| 1324 | |
| 1325 | ret = write_padding_to_file(metadata_stream->fd, |
| 1326 | be32toh(metadata_struct->padding_size)); |
| 1327 | if (ret < 0) { |
| 1328 | goto end_unlock; |
| 1329 | } |
| 1330 | metadata_stream->ctf_trace->metadata_received += |
| 1331 | payload_size + be32toh(metadata_struct->padding_size); |
| 1332 | |
| 1333 | DBG2("Relay metadata written"); |
| 1334 | |
| 1335 | end_unlock: |
| 1336 | rcu_read_unlock(); |
| 1337 | end: |
| 1338 | return ret; |
| 1339 | } |
| 1340 | |
| 1341 | /* |
| 1342 | * relay_send_version: send relayd version number |
| 1343 | */ |
| 1344 | static |
| 1345 | int relay_send_version(struct lttcomm_relayd_hdr *recv_hdr, |
| 1346 | struct relay_command *cmd, struct lttng_ht *sessions_ht) |
| 1347 | { |
| 1348 | int ret; |
| 1349 | struct lttcomm_relayd_version reply, msg; |
| 1350 | |
| 1351 | assert(cmd); |
| 1352 | |
| 1353 | cmd->version_check_done = 1; |
| 1354 | |
| 1355 | /* Get version from the other side. */ |
| 1356 | ret = cmd->sock->ops->recvmsg(cmd->sock, &msg, sizeof(msg), 0); |
| 1357 | if (ret < 0 || ret != sizeof(msg)) { |
| 1358 | if (ret == 0) { |
| 1359 | /* Orderly shutdown. Not necessary to print an error. */ |
| 1360 | DBG("Socket %d did an orderly shutdown", cmd->sock->fd); |
| 1361 | } else { |
| 1362 | ERR("Relay failed to receive the version values."); |
| 1363 | } |
| 1364 | ret = -1; |
| 1365 | goto end; |
| 1366 | } |
| 1367 | |
| 1368 | reply.major = RELAYD_VERSION_COMM_MAJOR; |
| 1369 | reply.minor = RELAYD_VERSION_COMM_MINOR; |
| 1370 | |
| 1371 | /* Major versions must be the same */ |
| 1372 | if (reply.major != be32toh(msg.major)) { |
| 1373 | DBG("Incompatible major versions (%u vs %u), deleting session", |
| 1374 | reply.major, be32toh(msg.major)); |
| 1375 | relay_delete_session(cmd, sessions_ht); |
| 1376 | ret = 0; |
| 1377 | goto end; |
| 1378 | } |
| 1379 | |
| 1380 | cmd->major = reply.major; |
| 1381 | /* We adapt to the lowest compatible version */ |
| 1382 | if (reply.minor <= be32toh(msg.minor)) { |
| 1383 | cmd->minor = reply.minor; |
| 1384 | } else { |
| 1385 | cmd->minor = be32toh(msg.minor); |
| 1386 | } |
| 1387 | |
| 1388 | reply.major = htobe32(reply.major); |
| 1389 | reply.minor = htobe32(reply.minor); |
| 1390 | ret = cmd->sock->ops->sendmsg(cmd->sock, &reply, |
| 1391 | sizeof(struct lttcomm_relayd_version), 0); |
| 1392 | if (ret < 0) { |
| 1393 | ERR("Relay sending version"); |
| 1394 | } |
| 1395 | |
| 1396 | DBG("Version check done using protocol %u.%u", cmd->major, |
| 1397 | cmd->minor); |
| 1398 | |
| 1399 | end: |
| 1400 | return ret; |
| 1401 | } |
| 1402 | |
| 1403 | /* |
| 1404 | * Check for data pending for a given stream id from the session daemon. |
| 1405 | */ |
| 1406 | static |
| 1407 | int relay_data_pending(struct lttcomm_relayd_hdr *recv_hdr, |
| 1408 | struct relay_command *cmd) |
| 1409 | { |
| 1410 | struct relay_session *session = cmd->session; |
| 1411 | struct lttcomm_relayd_data_pending msg; |
| 1412 | struct lttcomm_relayd_generic_reply reply; |
| 1413 | struct relay_stream *stream; |
| 1414 | int ret; |
| 1415 | uint64_t last_net_seq_num, stream_id; |
| 1416 | |
| 1417 | DBG("Data pending command received"); |
| 1418 | |
| 1419 | if (!session || cmd->version_check_done == 0) { |
| 1420 | ERR("Trying to check for data before version check"); |
| 1421 | ret = -1; |
| 1422 | goto end_no_session; |
| 1423 | } |
| 1424 | |
| 1425 | ret = cmd->sock->ops->recvmsg(cmd->sock, &msg, sizeof(msg), 0); |
| 1426 | if (ret < sizeof(msg)) { |
| 1427 | if (ret == 0) { |
| 1428 | /* Orderly shutdown. Not necessary to print an error. */ |
| 1429 | DBG("Socket %d did an orderly shutdown", cmd->sock->fd); |
| 1430 | } else { |
| 1431 | ERR("Relay didn't receive valid data_pending struct size : %d", |
| 1432 | ret); |
| 1433 | } |
| 1434 | ret = -1; |
| 1435 | goto end_no_session; |
| 1436 | } |
| 1437 | |
| 1438 | stream_id = be64toh(msg.stream_id); |
| 1439 | last_net_seq_num = be64toh(msg.last_net_seq_num); |
| 1440 | |
| 1441 | rcu_read_lock(); |
| 1442 | stream = relay_stream_find_by_id(stream_id); |
| 1443 | if (stream == NULL) { |
| 1444 | ret = -1; |
| 1445 | goto end_unlock; |
| 1446 | } |
| 1447 | |
| 1448 | DBG("Data pending for stream id %" PRIu64 " prev_seq %" PRIu64 |
| 1449 | " and last_seq %" PRIu64, stream_id, stream->prev_seq, |
| 1450 | last_net_seq_num); |
| 1451 | |
| 1452 | /* Avoid wrapping issue */ |
| 1453 | if (((int64_t) (stream->prev_seq - last_net_seq_num)) >= 0) { |
| 1454 | /* Data has in fact been written and is NOT pending */ |
| 1455 | ret = 0; |
| 1456 | } else { |
| 1457 | /* Data still being streamed thus pending */ |
| 1458 | ret = 1; |
| 1459 | } |
| 1460 | |
| 1461 | /* Pending check is now done. */ |
| 1462 | stream->data_pending_check_done = 1; |
| 1463 | |
| 1464 | end_unlock: |
| 1465 | rcu_read_unlock(); |
| 1466 | |
| 1467 | reply.ret_code = htobe32(ret); |
| 1468 | ret = cmd->sock->ops->sendmsg(cmd->sock, &reply, sizeof(reply), 0); |
| 1469 | if (ret < 0) { |
| 1470 | ERR("Relay data pending ret code failed"); |
| 1471 | } |
| 1472 | |
| 1473 | end_no_session: |
| 1474 | return ret; |
| 1475 | } |
| 1476 | |
| 1477 | /* |
| 1478 | * Wait for the control socket to reach a quiescent state. |
| 1479 | * |
| 1480 | * Note that for now, when receiving this command from the session daemon, this |
| 1481 | * means that every subsequent commands or data received on the control socket |
| 1482 | * has been handled. So, this is why we simply return OK here. |
| 1483 | */ |
| 1484 | static |
| 1485 | int relay_quiescent_control(struct lttcomm_relayd_hdr *recv_hdr, |
| 1486 | struct relay_command *cmd) |
| 1487 | { |
| 1488 | int ret; |
| 1489 | uint64_t stream_id; |
| 1490 | struct relay_stream *stream; |
| 1491 | struct lttng_ht_iter iter; |
| 1492 | struct lttcomm_relayd_quiescent_control msg; |
| 1493 | struct lttcomm_relayd_generic_reply reply; |
| 1494 | |
| 1495 | DBG("Checking quiescent state on control socket"); |
| 1496 | |
| 1497 | if (!cmd->session || cmd->version_check_done == 0) { |
| 1498 | ERR("Trying to check for data before version check"); |
| 1499 | ret = -1; |
| 1500 | goto end_no_session; |
| 1501 | } |
| 1502 | |
| 1503 | ret = cmd->sock->ops->recvmsg(cmd->sock, &msg, sizeof(msg), 0); |
| 1504 | if (ret < sizeof(msg)) { |
| 1505 | if (ret == 0) { |
| 1506 | /* Orderly shutdown. Not necessary to print an error. */ |
| 1507 | DBG("Socket %d did an orderly shutdown", cmd->sock->fd); |
| 1508 | } else { |
| 1509 | ERR("Relay didn't receive valid begin data_pending struct size: %d", |
| 1510 | ret); |
| 1511 | } |
| 1512 | ret = -1; |
| 1513 | goto end_no_session; |
| 1514 | } |
| 1515 | |
| 1516 | stream_id = be64toh(msg.stream_id); |
| 1517 | |
| 1518 | rcu_read_lock(); |
| 1519 | cds_lfht_for_each_entry(relay_streams_ht->ht, &iter.iter, stream, |
| 1520 | stream_n.node) { |
| 1521 | if (stream->stream_handle == stream_id) { |
| 1522 | stream->data_pending_check_done = 1; |
| 1523 | DBG("Relay quiescent control pending flag set to %" PRIu64, |
| 1524 | stream_id); |
| 1525 | break; |
| 1526 | } |
| 1527 | } |
| 1528 | rcu_read_unlock(); |
| 1529 | |
| 1530 | reply.ret_code = htobe32(LTTNG_OK); |
| 1531 | ret = cmd->sock->ops->sendmsg(cmd->sock, &reply, sizeof(reply), 0); |
| 1532 | if (ret < 0) { |
| 1533 | ERR("Relay data quiescent control ret code failed"); |
| 1534 | } |
| 1535 | |
| 1536 | end_no_session: |
| 1537 | return ret; |
| 1538 | } |
| 1539 | |
| 1540 | /* |
| 1541 | * Initialize a data pending command. This means that a client is about to ask |
| 1542 | * for data pending for each stream he/she holds. Simply iterate over all |
| 1543 | * streams of a session and set the data_pending_check_done flag. |
| 1544 | * |
| 1545 | * This command returns to the client a LTTNG_OK code. |
| 1546 | */ |
| 1547 | static |
| 1548 | int relay_begin_data_pending(struct lttcomm_relayd_hdr *recv_hdr, |
| 1549 | struct relay_command *cmd) |
| 1550 | { |
| 1551 | int ret; |
| 1552 | struct lttng_ht_iter iter; |
| 1553 | struct lttcomm_relayd_begin_data_pending msg; |
| 1554 | struct lttcomm_relayd_generic_reply reply; |
| 1555 | struct relay_stream *stream; |
| 1556 | uint64_t session_id; |
| 1557 | |
| 1558 | assert(recv_hdr); |
| 1559 | assert(cmd); |
| 1560 | |
| 1561 | DBG("Init streams for data pending"); |
| 1562 | |
| 1563 | if (!cmd->session || cmd->version_check_done == 0) { |
| 1564 | ERR("Trying to check for data before version check"); |
| 1565 | ret = -1; |
| 1566 | goto end_no_session; |
| 1567 | } |
| 1568 | |
| 1569 | ret = cmd->sock->ops->recvmsg(cmd->sock, &msg, sizeof(msg), 0); |
| 1570 | if (ret < sizeof(msg)) { |
| 1571 | if (ret == 0) { |
| 1572 | /* Orderly shutdown. Not necessary to print an error. */ |
| 1573 | DBG("Socket %d did an orderly shutdown", cmd->sock->fd); |
| 1574 | } else { |
| 1575 | ERR("Relay didn't receive valid begin data_pending struct size: %d", |
| 1576 | ret); |
| 1577 | } |
| 1578 | ret = -1; |
| 1579 | goto end_no_session; |
| 1580 | } |
| 1581 | |
| 1582 | session_id = be64toh(msg.session_id); |
| 1583 | |
| 1584 | /* |
| 1585 | * Iterate over all streams to set the begin data pending flag. For now, the |
| 1586 | * streams are indexed by stream handle so we have to iterate over all |
| 1587 | * streams to find the one associated with the right session_id. |
| 1588 | */ |
| 1589 | rcu_read_lock(); |
| 1590 | cds_lfht_for_each_entry(relay_streams_ht->ht, &iter.iter, stream, |
| 1591 | stream_n.node) { |
| 1592 | if (stream->session->id == session_id) { |
| 1593 | stream->data_pending_check_done = 0; |
| 1594 | DBG("Set begin data pending flag to stream %" PRIu64, |
| 1595 | stream->stream_handle); |
| 1596 | } |
| 1597 | } |
| 1598 | rcu_read_unlock(); |
| 1599 | |
| 1600 | /* All good, send back reply. */ |
| 1601 | reply.ret_code = htobe32(LTTNG_OK); |
| 1602 | |
| 1603 | ret = cmd->sock->ops->sendmsg(cmd->sock, &reply, sizeof(reply), 0); |
| 1604 | if (ret < 0) { |
| 1605 | ERR("Relay begin data pending send reply failed"); |
| 1606 | } |
| 1607 | |
| 1608 | end_no_session: |
| 1609 | return ret; |
| 1610 | } |
| 1611 | |
| 1612 | /* |
| 1613 | * End data pending command. This will check, for a given session id, if each |
| 1614 | * stream associated with it has its data_pending_check_done flag set. If not, |
| 1615 | * this means that the client lost track of the stream but the data is still |
| 1616 | * being streamed on our side. In this case, we inform the client that data is |
| 1617 | * inflight. |
| 1618 | * |
| 1619 | * Return to the client if there is data in flight or not with a ret_code. |
| 1620 | */ |
| 1621 | static |
| 1622 | int relay_end_data_pending(struct lttcomm_relayd_hdr *recv_hdr, |
| 1623 | struct relay_command *cmd) |
| 1624 | { |
| 1625 | int ret; |
| 1626 | struct lttng_ht_iter iter; |
| 1627 | struct lttcomm_relayd_end_data_pending msg; |
| 1628 | struct lttcomm_relayd_generic_reply reply; |
| 1629 | struct relay_stream *stream; |
| 1630 | uint64_t session_id; |
| 1631 | uint32_t is_data_inflight = 0; |
| 1632 | |
| 1633 | assert(recv_hdr); |
| 1634 | assert(cmd); |
| 1635 | |
| 1636 | DBG("End data pending command"); |
| 1637 | |
| 1638 | if (!cmd->session || cmd->version_check_done == 0) { |
| 1639 | ERR("Trying to check for data before version check"); |
| 1640 | ret = -1; |
| 1641 | goto end_no_session; |
| 1642 | } |
| 1643 | |
| 1644 | ret = cmd->sock->ops->recvmsg(cmd->sock, &msg, sizeof(msg), 0); |
| 1645 | if (ret < sizeof(msg)) { |
| 1646 | if (ret == 0) { |
| 1647 | /* Orderly shutdown. Not necessary to print an error. */ |
| 1648 | DBG("Socket %d did an orderly shutdown", cmd->sock->fd); |
| 1649 | } else { |
| 1650 | ERR("Relay didn't receive valid end data_pending struct size: %d", |
| 1651 | ret); |
| 1652 | } |
| 1653 | ret = -1; |
| 1654 | goto end_no_session; |
| 1655 | } |
| 1656 | |
| 1657 | session_id = be64toh(msg.session_id); |
| 1658 | |
| 1659 | /* Iterate over all streams to see if the begin data pending flag is set. */ |
| 1660 | rcu_read_lock(); |
| 1661 | cds_lfht_for_each_entry(relay_streams_ht->ht, &iter.iter, stream, |
| 1662 | stream_n.node) { |
| 1663 | if (stream->session->id == session_id && |
| 1664 | !stream->data_pending_check_done) { |
| 1665 | is_data_inflight = 1; |
| 1666 | DBG("Data is still in flight for stream %" PRIu64, |
| 1667 | stream->stream_handle); |
| 1668 | break; |
| 1669 | } |
| 1670 | } |
| 1671 | rcu_read_unlock(); |
| 1672 | |
| 1673 | /* All good, send back reply. */ |
| 1674 | reply.ret_code = htobe32(is_data_inflight); |
| 1675 | |
| 1676 | ret = cmd->sock->ops->sendmsg(cmd->sock, &reply, sizeof(reply), 0); |
| 1677 | if (ret < 0) { |
| 1678 | ERR("Relay end data pending send reply failed"); |
| 1679 | } |
| 1680 | |
| 1681 | end_no_session: |
| 1682 | return ret; |
| 1683 | } |
| 1684 | |
| 1685 | /* |
| 1686 | * Receive an index for a specific stream. |
| 1687 | * |
| 1688 | * Return 0 on success else a negative value. |
| 1689 | */ |
| 1690 | static |
| 1691 | int relay_recv_index(struct lttcomm_relayd_hdr *recv_hdr, |
| 1692 | struct relay_command *cmd) |
| 1693 | { |
| 1694 | int ret, send_ret, index_created = 0; |
| 1695 | struct relay_session *session = cmd->session; |
| 1696 | struct lttcomm_relayd_index index_info; |
| 1697 | struct relay_index *index, *wr_index = NULL; |
| 1698 | struct lttcomm_relayd_generic_reply reply; |
| 1699 | struct relay_stream *stream; |
| 1700 | uint64_t net_seq_num; |
| 1701 | |
| 1702 | assert(cmd); |
| 1703 | |
| 1704 | DBG("Relay receiving index"); |
| 1705 | |
| 1706 | if (!session || cmd->version_check_done == 0) { |
| 1707 | ERR("Trying to close a stream before version check"); |
| 1708 | ret = -1; |
| 1709 | goto end_no_session; |
| 1710 | } |
| 1711 | |
| 1712 | ret = cmd->sock->ops->recvmsg(cmd->sock, &index_info, |
| 1713 | sizeof(index_info), 0); |
| 1714 | if (ret < sizeof(index_info)) { |
| 1715 | if (ret == 0) { |
| 1716 | /* Orderly shutdown. Not necessary to print an error. */ |
| 1717 | DBG("Socket %d did an orderly shutdown", cmd->sock->fd); |
| 1718 | } else { |
| 1719 | ERR("Relay didn't receive valid index struct size : %d", ret); |
| 1720 | } |
| 1721 | ret = -1; |
| 1722 | goto end_no_session; |
| 1723 | } |
| 1724 | |
| 1725 | net_seq_num = be64toh(index_info.net_seq_num); |
| 1726 | |
| 1727 | rcu_read_lock(); |
| 1728 | stream = relay_stream_find_by_id(be64toh(index_info.relay_stream_id)); |
| 1729 | if (!stream) { |
| 1730 | ret = -1; |
| 1731 | goto end_rcu_unlock; |
| 1732 | } |
| 1733 | |
| 1734 | /* Live beacon handling */ |
| 1735 | if (index_info.packet_size == 0) { |
| 1736 | DBG("Received live beacon for stream %" PRIu64, stream->stream_handle); |
| 1737 | |
| 1738 | /* |
| 1739 | * Only flag a stream inactive when it has already received data. |
| 1740 | */ |
| 1741 | if (stream->total_index_received > 0) { |
| 1742 | stream->beacon_ts_end = be64toh(index_info.timestamp_end); |
| 1743 | } |
| 1744 | ret = 0; |
| 1745 | goto end_rcu_unlock; |
| 1746 | } else { |
| 1747 | stream->beacon_ts_end = -1ULL; |
| 1748 | } |
| 1749 | |
| 1750 | index = relay_index_find(stream->stream_handle, net_seq_num); |
| 1751 | if (!index) { |
| 1752 | /* A successful creation will add the object to the HT. */ |
| 1753 | index = relay_index_create(stream->stream_handle, net_seq_num); |
| 1754 | if (!index) { |
| 1755 | goto end_rcu_unlock; |
| 1756 | } |
| 1757 | index_created = 1; |
| 1758 | } |
| 1759 | |
| 1760 | copy_index_control_data(index, &index_info); |
| 1761 | |
| 1762 | if (index_created) { |
| 1763 | /* |
| 1764 | * Try to add the relay index object to the hash table. If an object |
| 1765 | * already exist, destroy back the index created, set the data in this |
| 1766 | * object and write it on disk. |
| 1767 | */ |
| 1768 | relay_index_add(index, &wr_index); |
| 1769 | if (wr_index) { |
| 1770 | copy_index_control_data(wr_index, &index_info); |
| 1771 | free(index); |
| 1772 | } |
| 1773 | } else { |
| 1774 | /* The index already exists so write it on disk. */ |
| 1775 | wr_index = index; |
| 1776 | } |
| 1777 | |
| 1778 | /* Do we have a writable ready index to write on disk. */ |
| 1779 | if (wr_index) { |
| 1780 | /* Starting at 2.4, create the index file if none available. */ |
| 1781 | if (cmd->minor >= 4 && stream->index_fd < 0) { |
| 1782 | ret = index_create_file(stream->path_name, stream->channel_name, |
| 1783 | relayd_uid, relayd_gid, stream->tracefile_size, |
| 1784 | stream->tracefile_count_current); |
| 1785 | if (ret < 0) { |
| 1786 | goto end_rcu_unlock; |
| 1787 | } |
| 1788 | stream->index_fd = ret; |
| 1789 | } |
| 1790 | |
| 1791 | ret = relay_index_write(wr_index->fd, wr_index); |
| 1792 | if (ret < 0) { |
| 1793 | goto end_rcu_unlock; |
| 1794 | } |
| 1795 | stream->total_index_received++; |
| 1796 | } |
| 1797 | |
| 1798 | end_rcu_unlock: |
| 1799 | rcu_read_unlock(); |
| 1800 | |
| 1801 | if (ret < 0) { |
| 1802 | reply.ret_code = htobe32(LTTNG_ERR_UNK); |
| 1803 | } else { |
| 1804 | reply.ret_code = htobe32(LTTNG_OK); |
| 1805 | } |
| 1806 | send_ret = cmd->sock->ops->sendmsg(cmd->sock, &reply, sizeof(reply), 0); |
| 1807 | if (send_ret < 0) { |
| 1808 | ERR("Relay sending close index id reply"); |
| 1809 | ret = send_ret; |
| 1810 | } |
| 1811 | |
| 1812 | end_no_session: |
| 1813 | return ret; |
| 1814 | } |
| 1815 | |
| 1816 | /* |
| 1817 | * Process the commands received on the control socket |
| 1818 | */ |
| 1819 | static |
| 1820 | int relay_process_control(struct lttcomm_relayd_hdr *recv_hdr, |
| 1821 | struct relay_command *cmd, struct relay_local_data *ctx) |
| 1822 | { |
| 1823 | int ret = 0; |
| 1824 | |
| 1825 | switch (be32toh(recv_hdr->cmd)) { |
| 1826 | case RELAYD_CREATE_SESSION: |
| 1827 | ret = relay_create_session(recv_hdr, cmd, ctx->sessions_ht); |
| 1828 | break; |
| 1829 | case RELAYD_ADD_STREAM: |
| 1830 | ret = relay_add_stream(recv_hdr, cmd, ctx->sessions_ht); |
| 1831 | break; |
| 1832 | case RELAYD_START_DATA: |
| 1833 | ret = relay_start(recv_hdr, cmd); |
| 1834 | break; |
| 1835 | case RELAYD_SEND_METADATA: |
| 1836 | ret = relay_recv_metadata(recv_hdr, cmd); |
| 1837 | break; |
| 1838 | case RELAYD_VERSION: |
| 1839 | ret = relay_send_version(recv_hdr, cmd, ctx->sessions_ht); |
| 1840 | break; |
| 1841 | case RELAYD_CLOSE_STREAM: |
| 1842 | ret = relay_close_stream(recv_hdr, cmd); |
| 1843 | break; |
| 1844 | case RELAYD_DATA_PENDING: |
| 1845 | ret = relay_data_pending(recv_hdr, cmd); |
| 1846 | break; |
| 1847 | case RELAYD_QUIESCENT_CONTROL: |
| 1848 | ret = relay_quiescent_control(recv_hdr, cmd); |
| 1849 | break; |
| 1850 | case RELAYD_BEGIN_DATA_PENDING: |
| 1851 | ret = relay_begin_data_pending(recv_hdr, cmd); |
| 1852 | break; |
| 1853 | case RELAYD_END_DATA_PENDING: |
| 1854 | ret = relay_end_data_pending(recv_hdr, cmd); |
| 1855 | break; |
| 1856 | case RELAYD_SEND_INDEX: |
| 1857 | ret = relay_recv_index(recv_hdr, cmd); |
| 1858 | break; |
| 1859 | case RELAYD_UPDATE_SYNC_INFO: |
| 1860 | default: |
| 1861 | ERR("Received unknown command (%u)", be32toh(recv_hdr->cmd)); |
| 1862 | relay_unknown_command(cmd); |
| 1863 | ret = -1; |
| 1864 | goto end; |
| 1865 | } |
| 1866 | |
| 1867 | end: |
| 1868 | return ret; |
| 1869 | } |
| 1870 | |
| 1871 | /* |
| 1872 | * Handle index for a data stream. |
| 1873 | * |
| 1874 | * RCU read side lock MUST be acquired. |
| 1875 | * |
| 1876 | * Return 0 on success else a negative value. |
| 1877 | */ |
| 1878 | static int handle_index_data(struct relay_stream *stream, uint64_t net_seq_num, |
| 1879 | int rotate_index) |
| 1880 | { |
| 1881 | int ret = 0, index_created = 0; |
| 1882 | uint64_t stream_id, data_offset; |
| 1883 | struct relay_index *index, *wr_index = NULL; |
| 1884 | |
| 1885 | assert(stream); |
| 1886 | |
| 1887 | stream_id = stream->stream_handle; |
| 1888 | /* Get data offset because we are about to update the index. */ |
| 1889 | data_offset = htobe64(stream->tracefile_size_current); |
| 1890 | |
| 1891 | /* |
| 1892 | * Lookup for an existing index for that stream id/sequence number. If on |
| 1893 | * exists, the control thread already received the data for it thus we need |
| 1894 | * to write it on disk. |
| 1895 | */ |
| 1896 | index = relay_index_find(stream_id, net_seq_num); |
| 1897 | if (!index) { |
| 1898 | /* A successful creation will add the object to the HT. */ |
| 1899 | index = relay_index_create(stream_id, net_seq_num); |
| 1900 | if (!index) { |
| 1901 | ret = -1; |
| 1902 | goto error; |
| 1903 | } |
| 1904 | index_created = 1; |
| 1905 | } |
| 1906 | |
| 1907 | if (rotate_index || stream->index_fd < 0) { |
| 1908 | index->to_close_fd = stream->index_fd; |
| 1909 | ret = index_create_file(stream->path_name, stream->channel_name, |
| 1910 | relayd_uid, relayd_gid, stream->tracefile_size, |
| 1911 | stream->tracefile_count_current); |
| 1912 | if (ret < 0) { |
| 1913 | /* This will close the stream's index fd if one. */ |
| 1914 | relay_index_free_safe(index); |
| 1915 | goto error; |
| 1916 | } |
| 1917 | stream->index_fd = ret; |
| 1918 | } |
| 1919 | index->fd = stream->index_fd; |
| 1920 | index->index_data.offset = data_offset; |
| 1921 | |
| 1922 | if (index_created) { |
| 1923 | /* |
| 1924 | * Try to add the relay index object to the hash table. If an object |
| 1925 | * already exist, destroy back the index created and set the data. |
| 1926 | */ |
| 1927 | relay_index_add(index, &wr_index); |
| 1928 | if (wr_index) { |
| 1929 | /* Copy back data from the created index. */ |
| 1930 | wr_index->fd = index->fd; |
| 1931 | wr_index->to_close_fd = index->to_close_fd; |
| 1932 | wr_index->index_data.offset = data_offset; |
| 1933 | free(index); |
| 1934 | } |
| 1935 | } else { |
| 1936 | /* The index already exists so write it on disk. */ |
| 1937 | wr_index = index; |
| 1938 | } |
| 1939 | |
| 1940 | /* Do we have a writable ready index to write on disk. */ |
| 1941 | if (wr_index) { |
| 1942 | ret = relay_index_write(wr_index->fd, wr_index); |
| 1943 | if (ret < 0) { |
| 1944 | goto error; |
| 1945 | } |
| 1946 | stream->total_index_received++; |
| 1947 | } |
| 1948 | |
| 1949 | error: |
| 1950 | return ret; |
| 1951 | } |
| 1952 | |
| 1953 | /* |
| 1954 | * relay_process_data: Process the data received on the data socket |
| 1955 | */ |
| 1956 | static |
| 1957 | int relay_process_data(struct relay_command *cmd) |
| 1958 | { |
| 1959 | int ret = 0, rotate_index = 0; |
| 1960 | struct relay_stream *stream; |
| 1961 | struct lttcomm_relayd_data_hdr data_hdr; |
| 1962 | uint64_t stream_id; |
| 1963 | uint64_t net_seq_num; |
| 1964 | uint32_t data_size; |
| 1965 | |
| 1966 | ret = cmd->sock->ops->recvmsg(cmd->sock, &data_hdr, |
| 1967 | sizeof(struct lttcomm_relayd_data_hdr), 0); |
| 1968 | if (ret <= 0) { |
| 1969 | if (ret == 0) { |
| 1970 | /* Orderly shutdown. Not necessary to print an error. */ |
| 1971 | DBG("Socket %d did an orderly shutdown", cmd->sock->fd); |
| 1972 | } else { |
| 1973 | ERR("Unable to receive data header on sock %d", cmd->sock->fd); |
| 1974 | } |
| 1975 | ret = -1; |
| 1976 | goto end; |
| 1977 | } |
| 1978 | |
| 1979 | stream_id = be64toh(data_hdr.stream_id); |
| 1980 | |
| 1981 | rcu_read_lock(); |
| 1982 | stream = relay_stream_find_by_id(stream_id); |
| 1983 | if (!stream) { |
| 1984 | ret = -1; |
| 1985 | goto end_rcu_unlock; |
| 1986 | } |
| 1987 | |
| 1988 | data_size = be32toh(data_hdr.data_size); |
| 1989 | if (data_buffer_size < data_size) { |
| 1990 | char *tmp_data_ptr; |
| 1991 | |
| 1992 | tmp_data_ptr = realloc(data_buffer, data_size); |
| 1993 | if (!tmp_data_ptr) { |
| 1994 | ERR("Allocating data buffer"); |
| 1995 | free(data_buffer); |
| 1996 | ret = -1; |
| 1997 | goto end_rcu_unlock; |
| 1998 | } |
| 1999 | data_buffer = tmp_data_ptr; |
| 2000 | data_buffer_size = data_size; |
| 2001 | } |
| 2002 | memset(data_buffer, 0, data_size); |
| 2003 | |
| 2004 | net_seq_num = be64toh(data_hdr.net_seq_num); |
| 2005 | |
| 2006 | DBG3("Receiving data of size %u for stream id %" PRIu64 " seqnum %" PRIu64, |
| 2007 | data_size, stream_id, net_seq_num); |
| 2008 | ret = cmd->sock->ops->recvmsg(cmd->sock, data_buffer, data_size, 0); |
| 2009 | if (ret <= 0) { |
| 2010 | if (ret == 0) { |
| 2011 | /* Orderly shutdown. Not necessary to print an error. */ |
| 2012 | DBG("Socket %d did an orderly shutdown", cmd->sock->fd); |
| 2013 | } |
| 2014 | ret = -1; |
| 2015 | goto end_rcu_unlock; |
| 2016 | } |
| 2017 | |
| 2018 | /* Check if a rotation is needed. */ |
| 2019 | if (stream->tracefile_size > 0 && |
| 2020 | (stream->tracefile_size_current + data_size) > |
| 2021 | stream->tracefile_size) { |
| 2022 | ret = utils_rotate_stream_file(stream->path_name, stream->channel_name, |
| 2023 | stream->tracefile_size, stream->tracefile_count, |
| 2024 | relayd_uid, relayd_gid, stream->fd, |
| 2025 | &(stream->tracefile_count_current), &stream->fd); |
| 2026 | if (ret < 0) { |
| 2027 | ERR("Rotating stream output file"); |
| 2028 | goto end_rcu_unlock; |
| 2029 | } |
| 2030 | /* Reset current size because we just perform a stream rotation. */ |
| 2031 | stream->tracefile_size_current = 0; |
| 2032 | rotate_index = 1; |
| 2033 | } |
| 2034 | |
| 2035 | /* |
| 2036 | * Index are handled in protocol version 2.4 and above. Also, snapshot and |
| 2037 | * index are NOT supported. |
| 2038 | */ |
| 2039 | if (stream->session->minor >= 4 && !stream->session->snapshot) { |
| 2040 | ret = handle_index_data(stream, net_seq_num, rotate_index); |
| 2041 | if (ret < 0) { |
| 2042 | goto end_rcu_unlock; |
| 2043 | } |
| 2044 | } |
| 2045 | |
| 2046 | /* Write data to stream output fd. */ |
| 2047 | do { |
| 2048 | ret = write(stream->fd, data_buffer, data_size); |
| 2049 | } while (ret < 0 && errno == EINTR); |
| 2050 | if (ret < 0 || ret != data_size) { |
| 2051 | ERR("Relay error writing data to file"); |
| 2052 | ret = -1; |
| 2053 | goto end_rcu_unlock; |
| 2054 | } |
| 2055 | |
| 2056 | DBG2("Relay wrote %d bytes to tracefile for stream id %" PRIu64, |
| 2057 | ret, stream->stream_handle); |
| 2058 | |
| 2059 | ret = write_padding_to_file(stream->fd, be32toh(data_hdr.padding_size)); |
| 2060 | if (ret < 0) { |
| 2061 | goto end_rcu_unlock; |
| 2062 | } |
| 2063 | stream->tracefile_size_current += data_size + be32toh(data_hdr.padding_size); |
| 2064 | |
| 2065 | stream->prev_seq = net_seq_num; |
| 2066 | |
| 2067 | /* Check if we need to close the FD */ |
| 2068 | if (close_stream_check(stream)) { |
| 2069 | destroy_stream(stream, cmd->ctf_traces_ht); |
| 2070 | } |
| 2071 | |
| 2072 | end_rcu_unlock: |
| 2073 | rcu_read_unlock(); |
| 2074 | end: |
| 2075 | return ret; |
| 2076 | } |
| 2077 | |
| 2078 | static |
| 2079 | void relay_cleanup_poll_connection(struct lttng_poll_event *events, int pollfd) |
| 2080 | { |
| 2081 | int ret; |
| 2082 | |
| 2083 | lttng_poll_del(events, pollfd); |
| 2084 | |
| 2085 | ret = close(pollfd); |
| 2086 | if (ret < 0) { |
| 2087 | ERR("Closing pollfd %d", pollfd); |
| 2088 | } |
| 2089 | } |
| 2090 | |
| 2091 | static |
| 2092 | int relay_add_connection(int fd, struct lttng_poll_event *events, |
| 2093 | struct lttng_ht *relay_connections_ht) |
| 2094 | { |
| 2095 | struct relay_command *relay_connection; |
| 2096 | int ret; |
| 2097 | |
| 2098 | relay_connection = zmalloc(sizeof(struct relay_command)); |
| 2099 | if (relay_connection == NULL) { |
| 2100 | PERROR("Relay command zmalloc"); |
| 2101 | goto error; |
| 2102 | } |
| 2103 | do { |
| 2104 | ret = read(fd, relay_connection, sizeof(struct relay_command)); |
| 2105 | } while (ret < 0 && errno == EINTR); |
| 2106 | if (ret < 0 || ret < sizeof(struct relay_command)) { |
| 2107 | PERROR("read relay cmd pipe"); |
| 2108 | goto error_read; |
| 2109 | } |
| 2110 | |
| 2111 | relay_connection->ctf_traces_ht = lttng_ht_new(0, LTTNG_HT_TYPE_STRING); |
| 2112 | if (!relay_connection->ctf_traces_ht) { |
| 2113 | goto error_read; |
| 2114 | } |
| 2115 | |
| 2116 | lttng_ht_node_init_ulong(&relay_connection->sock_n, |
| 2117 | (unsigned long) relay_connection->sock->fd); |
| 2118 | rcu_read_lock(); |
| 2119 | lttng_ht_add_unique_ulong(relay_connections_ht, |
| 2120 | &relay_connection->sock_n); |
| 2121 | rcu_read_unlock(); |
| 2122 | return lttng_poll_add(events, |
| 2123 | relay_connection->sock->fd, |
| 2124 | LPOLLIN | LPOLLRDHUP); |
| 2125 | |
| 2126 | error_read: |
| 2127 | free(relay_connection); |
| 2128 | error: |
| 2129 | return -1; |
| 2130 | } |
| 2131 | |
| 2132 | static |
| 2133 | void deferred_free_connection(struct rcu_head *head) |
| 2134 | { |
| 2135 | struct relay_command *relay_connection = |
| 2136 | caa_container_of(head, struct relay_command, rcu_node); |
| 2137 | |
| 2138 | lttng_ht_destroy(relay_connection->ctf_traces_ht); |
| 2139 | lttcomm_destroy_sock(relay_connection->sock); |
| 2140 | free(relay_connection); |
| 2141 | } |
| 2142 | |
| 2143 | static |
| 2144 | void relay_del_connection(struct lttng_ht *relay_connections_ht, |
| 2145 | struct lttng_ht_iter *iter, struct relay_command *relay_connection, |
| 2146 | struct lttng_ht *sessions_ht) |
| 2147 | { |
| 2148 | int ret; |
| 2149 | |
| 2150 | ret = lttng_ht_del(relay_connections_ht, iter); |
| 2151 | assert(!ret); |
| 2152 | if (relay_connection->type == RELAY_CONTROL) { |
| 2153 | relay_delete_session(relay_connection, sessions_ht); |
| 2154 | } |
| 2155 | |
| 2156 | call_rcu(&relay_connection->rcu_node, |
| 2157 | deferred_free_connection); |
| 2158 | } |
| 2159 | |
| 2160 | /* |
| 2161 | * This thread does the actual work |
| 2162 | */ |
| 2163 | static |
| 2164 | void *relay_thread_worker(void *data) |
| 2165 | { |
| 2166 | int ret, err = -1, last_seen_data_fd = -1; |
| 2167 | uint32_t nb_fd; |
| 2168 | struct relay_command *relay_connection; |
| 2169 | struct lttng_poll_event events; |
| 2170 | struct lttng_ht *relay_connections_ht; |
| 2171 | struct lttng_ht_node_ulong *node; |
| 2172 | struct lttng_ht_iter iter; |
| 2173 | struct lttcomm_relayd_hdr recv_hdr; |
| 2174 | struct relay_local_data *relay_ctx = (struct relay_local_data *) data; |
| 2175 | struct lttng_ht *sessions_ht = relay_ctx->sessions_ht; |
| 2176 | |
| 2177 | DBG("[thread] Relay worker started"); |
| 2178 | |
| 2179 | rcu_register_thread(); |
| 2180 | |
| 2181 | health_register(health_relayd, HEALTH_RELAYD_TYPE_WORKER); |
| 2182 | |
| 2183 | health_code_update(); |
| 2184 | |
| 2185 | /* table of connections indexed on socket */ |
| 2186 | relay_connections_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
| 2187 | if (!relay_connections_ht) { |
| 2188 | goto relay_connections_ht_error; |
| 2189 | } |
| 2190 | |
| 2191 | /* Tables of received indexes indexed by index handle and net_seq_num. */ |
| 2192 | indexes_ht = lttng_ht_new(0, LTTNG_HT_TYPE_TWO_U64); |
| 2193 | if (!indexes_ht) { |
| 2194 | goto indexes_ht_error; |
| 2195 | } |
| 2196 | |
| 2197 | ret = create_thread_poll_set(&events, 2); |
| 2198 | if (ret < 0) { |
| 2199 | goto error_poll_create; |
| 2200 | } |
| 2201 | |
| 2202 | ret = lttng_poll_add(&events, relay_cmd_pipe[0], LPOLLIN | LPOLLRDHUP); |
| 2203 | if (ret < 0) { |
| 2204 | goto error; |
| 2205 | } |
| 2206 | |
| 2207 | restart: |
| 2208 | while (1) { |
| 2209 | int idx = -1, i, seen_control = 0, last_notdel_data_fd = -1; |
| 2210 | |
| 2211 | health_code_update(); |
| 2212 | |
| 2213 | /* Infinite blocking call, waiting for transmission */ |
| 2214 | DBG3("Relayd worker thread polling..."); |
| 2215 | health_poll_entry(); |
| 2216 | ret = lttng_poll_wait(&events, -1); |
| 2217 | health_poll_exit(); |
| 2218 | if (ret < 0) { |
| 2219 | /* |
| 2220 | * Restart interrupted system call. |
| 2221 | */ |
| 2222 | if (errno == EINTR) { |
| 2223 | goto restart; |
| 2224 | } |
| 2225 | goto error; |
| 2226 | } |
| 2227 | |
| 2228 | nb_fd = ret; |
| 2229 | |
| 2230 | /* |
| 2231 | * Process control. The control connection is prioritised so we don't |
| 2232 | * starve it with high throughout put tracing data on the data |
| 2233 | * connection. |
| 2234 | */ |
| 2235 | for (i = 0; i < nb_fd; i++) { |
| 2236 | /* Fetch once the poll data */ |
| 2237 | uint32_t revents = LTTNG_POLL_GETEV(&events, i); |
| 2238 | int pollfd = LTTNG_POLL_GETFD(&events, i); |
| 2239 | |
| 2240 | health_code_update(); |
| 2241 | |
| 2242 | /* Thread quit pipe has been closed. Killing thread. */ |
| 2243 | ret = check_thread_quit_pipe(pollfd, revents); |
| 2244 | if (ret) { |
| 2245 | err = 0; |
| 2246 | goto exit; |
| 2247 | } |
| 2248 | |
| 2249 | /* Inspect the relay cmd pipe for new connection */ |
| 2250 | if (pollfd == relay_cmd_pipe[0]) { |
| 2251 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { |
| 2252 | ERR("Relay pipe error"); |
| 2253 | goto error; |
| 2254 | } else if (revents & LPOLLIN) { |
| 2255 | DBG("Relay command received"); |
| 2256 | ret = relay_add_connection(relay_cmd_pipe[0], |
| 2257 | &events, relay_connections_ht); |
| 2258 | if (ret < 0) { |
| 2259 | goto error; |
| 2260 | } |
| 2261 | } |
| 2262 | } else if (revents) { |
| 2263 | rcu_read_lock(); |
| 2264 | lttng_ht_lookup(relay_connections_ht, |
| 2265 | (void *)((unsigned long) pollfd), |
| 2266 | &iter); |
| 2267 | node = lttng_ht_iter_get_node_ulong(&iter); |
| 2268 | if (node == NULL) { |
| 2269 | DBG2("Relay sock %d not found", pollfd); |
| 2270 | rcu_read_unlock(); |
| 2271 | goto error; |
| 2272 | } |
| 2273 | relay_connection = caa_container_of(node, |
| 2274 | struct relay_command, sock_n); |
| 2275 | |
| 2276 | if (revents & (LPOLLERR)) { |
| 2277 | ERR("POLL ERROR"); |
| 2278 | relay_cleanup_poll_connection(&events, pollfd); |
| 2279 | relay_del_connection(relay_connections_ht, |
| 2280 | &iter, relay_connection, sessions_ht); |
| 2281 | if (last_seen_data_fd == pollfd) { |
| 2282 | last_seen_data_fd = last_notdel_data_fd; |
| 2283 | } |
| 2284 | } else if (revents & (LPOLLHUP | LPOLLRDHUP)) { |
| 2285 | DBG("Socket %d hung up", pollfd); |
| 2286 | relay_cleanup_poll_connection(&events, pollfd); |
| 2287 | relay_del_connection(relay_connections_ht, |
| 2288 | &iter, relay_connection, sessions_ht); |
| 2289 | if (last_seen_data_fd == pollfd) { |
| 2290 | last_seen_data_fd = last_notdel_data_fd; |
| 2291 | } |
| 2292 | } else if (revents & LPOLLIN) { |
| 2293 | /* control socket */ |
| 2294 | if (relay_connection->type == RELAY_CONTROL) { |
| 2295 | ret = relay_connection->sock->ops->recvmsg( |
| 2296 | relay_connection->sock, &recv_hdr, |
| 2297 | sizeof(struct lttcomm_relayd_hdr), 0); |
| 2298 | /* connection closed */ |
| 2299 | if (ret <= 0) { |
| 2300 | relay_cleanup_poll_connection(&events, pollfd); |
| 2301 | relay_del_connection(relay_connections_ht, |
| 2302 | &iter, relay_connection, sessions_ht); |
| 2303 | DBG("Control connection closed with %d", pollfd); |
| 2304 | } else { |
| 2305 | if (relay_connection->session) { |
| 2306 | DBG2("Relay worker receiving data for session : %" PRIu64, |
| 2307 | relay_connection->session->id); |
| 2308 | } |
| 2309 | ret = relay_process_control(&recv_hdr, |
| 2310 | relay_connection, relay_ctx); |
| 2311 | if (ret < 0) { |
| 2312 | /* Clear the session on error. */ |
| 2313 | relay_cleanup_poll_connection(&events, pollfd); |
| 2314 | relay_del_connection(relay_connections_ht, |
| 2315 | &iter, relay_connection, sessions_ht); |
| 2316 | DBG("Connection closed with %d", pollfd); |
| 2317 | } |
| 2318 | seen_control = 1; |
| 2319 | } |
| 2320 | } else { |
| 2321 | /* |
| 2322 | * Flag the last seen data fd not deleted. It will be |
| 2323 | * used as the last seen fd if any fd gets deleted in |
| 2324 | * this first loop. |
| 2325 | */ |
| 2326 | last_notdel_data_fd = pollfd; |
| 2327 | } |
| 2328 | } |
| 2329 | rcu_read_unlock(); |
| 2330 | } |
| 2331 | } |
| 2332 | |
| 2333 | /* |
| 2334 | * The last loop handled a control request, go back to poll to make |
| 2335 | * sure we prioritise the control socket. |
| 2336 | */ |
| 2337 | if (seen_control) { |
| 2338 | continue; |
| 2339 | } |
| 2340 | |
| 2341 | if (last_seen_data_fd >= 0) { |
| 2342 | for (i = 0; i < nb_fd; i++) { |
| 2343 | int pollfd = LTTNG_POLL_GETFD(&events, i); |
| 2344 | |
| 2345 | health_code_update(); |
| 2346 | |
| 2347 | if (last_seen_data_fd == pollfd) { |
| 2348 | idx = i; |
| 2349 | break; |
| 2350 | } |
| 2351 | } |
| 2352 | } |
| 2353 | |
| 2354 | /* Process data connection. */ |
| 2355 | for (i = idx + 1; i < nb_fd; i++) { |
| 2356 | /* Fetch the poll data. */ |
| 2357 | uint32_t revents = LTTNG_POLL_GETEV(&events, i); |
| 2358 | int pollfd = LTTNG_POLL_GETFD(&events, i); |
| 2359 | |
| 2360 | health_code_update(); |
| 2361 | |
| 2362 | /* Skip the command pipe. It's handled in the first loop. */ |
| 2363 | if (pollfd == relay_cmd_pipe[0]) { |
| 2364 | continue; |
| 2365 | } |
| 2366 | |
| 2367 | if (revents) { |
| 2368 | rcu_read_lock(); |
| 2369 | lttng_ht_lookup(relay_connections_ht, |
| 2370 | (void *)((unsigned long) pollfd), |
| 2371 | &iter); |
| 2372 | node = lttng_ht_iter_get_node_ulong(&iter); |
| 2373 | if (node == NULL) { |
| 2374 | /* Skip it. Might be removed before. */ |
| 2375 | rcu_read_unlock(); |
| 2376 | continue; |
| 2377 | } |
| 2378 | relay_connection = caa_container_of(node, |
| 2379 | struct relay_command, sock_n); |
| 2380 | |
| 2381 | if (revents & LPOLLIN) { |
| 2382 | if (relay_connection->type != RELAY_DATA) { |
| 2383 | continue; |
| 2384 | } |
| 2385 | |
| 2386 | ret = relay_process_data(relay_connection); |
| 2387 | /* connection closed */ |
| 2388 | if (ret < 0) { |
| 2389 | relay_cleanup_poll_connection(&events, pollfd); |
| 2390 | relay_del_connection(relay_connections_ht, |
| 2391 | &iter, relay_connection, sessions_ht); |
| 2392 | DBG("Data connection closed with %d", pollfd); |
| 2393 | /* |
| 2394 | * Every goto restart call sets the last seen fd where |
| 2395 | * here we don't really care since we gracefully |
| 2396 | * continue the loop after the connection is deleted. |
| 2397 | */ |
| 2398 | } else { |
| 2399 | /* Keep last seen port. */ |
| 2400 | last_seen_data_fd = pollfd; |
| 2401 | rcu_read_unlock(); |
| 2402 | goto restart; |
| 2403 | } |
| 2404 | } |
| 2405 | rcu_read_unlock(); |
| 2406 | } |
| 2407 | } |
| 2408 | last_seen_data_fd = -1; |
| 2409 | } |
| 2410 | |
| 2411 | /* Normal exit, no error */ |
| 2412 | ret = 0; |
| 2413 | |
| 2414 | exit: |
| 2415 | error: |
| 2416 | lttng_poll_clean(&events); |
| 2417 | |
| 2418 | /* empty the hash table and free the memory */ |
| 2419 | rcu_read_lock(); |
| 2420 | cds_lfht_for_each_entry(relay_connections_ht->ht, &iter.iter, node, node) { |
| 2421 | health_code_update(); |
| 2422 | |
| 2423 | node = lttng_ht_iter_get_node_ulong(&iter); |
| 2424 | if (node) { |
| 2425 | relay_connection = caa_container_of(node, |
| 2426 | struct relay_command, sock_n); |
| 2427 | relay_del_connection(relay_connections_ht, |
| 2428 | &iter, relay_connection, sessions_ht); |
| 2429 | } |
| 2430 | } |
| 2431 | rcu_read_unlock(); |
| 2432 | error_poll_create: |
| 2433 | lttng_ht_destroy(indexes_ht); |
| 2434 | indexes_ht_error: |
| 2435 | lttng_ht_destroy(relay_connections_ht); |
| 2436 | relay_connections_ht_error: |
| 2437 | /* Close relay cmd pipes */ |
| 2438 | utils_close_pipe(relay_cmd_pipe); |
| 2439 | if (err) { |
| 2440 | DBG("Thread exited with error"); |
| 2441 | } |
| 2442 | DBG("Worker thread cleanup complete"); |
| 2443 | free(data_buffer); |
| 2444 | if (err) { |
| 2445 | health_error(); |
| 2446 | ERR("Health error occurred in %s", __func__); |
| 2447 | } |
| 2448 | health_unregister(health_relayd); |
| 2449 | rcu_unregister_thread(); |
| 2450 | stop_threads(); |
| 2451 | return NULL; |
| 2452 | } |
| 2453 | |
| 2454 | /* |
| 2455 | * Create the relay command pipe to wake thread_manage_apps. |
| 2456 | * Closed in cleanup(). |
| 2457 | */ |
| 2458 | static int create_relay_cmd_pipe(void) |
| 2459 | { |
| 2460 | int ret; |
| 2461 | |
| 2462 | ret = utils_create_pipe_cloexec(relay_cmd_pipe); |
| 2463 | |
| 2464 | return ret; |
| 2465 | } |
| 2466 | |
| 2467 | /* |
| 2468 | * main |
| 2469 | */ |
| 2470 | int main(int argc, char **argv) |
| 2471 | { |
| 2472 | int ret = 0; |
| 2473 | void *status; |
| 2474 | struct relay_local_data *relay_ctx; |
| 2475 | |
| 2476 | /* Create thread quit pipe */ |
| 2477 | if ((ret = init_thread_quit_pipe()) < 0) { |
| 2478 | goto error; |
| 2479 | } |
| 2480 | |
| 2481 | /* Parse arguments */ |
| 2482 | progname = argv[0]; |
| 2483 | if ((ret = parse_args(argc, argv)) < 0) { |
| 2484 | goto exit; |
| 2485 | } |
| 2486 | |
| 2487 | if ((ret = set_signal_handler()) < 0) { |
| 2488 | goto exit; |
| 2489 | } |
| 2490 | |
| 2491 | /* Try to create directory if -o, --output is specified. */ |
| 2492 | if (opt_output_path) { |
| 2493 | if (*opt_output_path != '/') { |
| 2494 | ERR("Please specify an absolute path for -o, --output PATH"); |
| 2495 | goto exit; |
| 2496 | } |
| 2497 | |
| 2498 | ret = utils_mkdir_recursive(opt_output_path, S_IRWXU | S_IRWXG); |
| 2499 | if (ret < 0) { |
| 2500 | ERR("Unable to create %s", opt_output_path); |
| 2501 | goto exit; |
| 2502 | } |
| 2503 | } |
| 2504 | |
| 2505 | /* Daemonize */ |
| 2506 | if (opt_daemon) { |
| 2507 | ret = daemon(0, 0); |
| 2508 | if (ret < 0) { |
| 2509 | PERROR("daemon"); |
| 2510 | goto exit; |
| 2511 | } |
| 2512 | } |
| 2513 | |
| 2514 | /* We need those values for the file/dir creation. */ |
| 2515 | relayd_uid = getuid(); |
| 2516 | relayd_gid = getgid(); |
| 2517 | |
| 2518 | /* Check if daemon is UID = 0 */ |
| 2519 | if (relayd_uid == 0) { |
| 2520 | if (control_uri->port < 1024 || data_uri->port < 1024) { |
| 2521 | ERR("Need to be root to use ports < 1024"); |
| 2522 | ret = -1; |
| 2523 | goto exit; |
| 2524 | } |
| 2525 | } |
| 2526 | |
| 2527 | /* Setup the thread apps communication pipe. */ |
| 2528 | if ((ret = create_relay_cmd_pipe()) < 0) { |
| 2529 | goto exit; |
| 2530 | } |
| 2531 | |
| 2532 | /* Init relay command queue. */ |
| 2533 | cds_wfq_init(&relay_cmd_queue.queue); |
| 2534 | |
| 2535 | /* Set up max poll set size */ |
| 2536 | lttng_poll_set_max_size(); |
| 2537 | |
| 2538 | /* Initialize communication library */ |
| 2539 | lttcomm_init(); |
| 2540 | |
| 2541 | relay_ctx = zmalloc(sizeof(struct relay_local_data)); |
| 2542 | if (!relay_ctx) { |
| 2543 | PERROR("relay_ctx"); |
| 2544 | goto exit; |
| 2545 | } |
| 2546 | |
| 2547 | /* tables of sessions indexed by session ID */ |
| 2548 | relay_ctx->sessions_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
| 2549 | if (!relay_ctx->sessions_ht) { |
| 2550 | goto exit_relay_ctx_sessions; |
| 2551 | } |
| 2552 | |
| 2553 | /* tables of streams indexed by stream ID */ |
| 2554 | relay_streams_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
| 2555 | if (!relay_streams_ht) { |
| 2556 | goto exit_relay_ctx_streams; |
| 2557 | } |
| 2558 | |
| 2559 | /* tables of streams indexed by stream ID */ |
| 2560 | viewer_streams_ht = lttng_ht_new(0, LTTNG_HT_TYPE_U64); |
| 2561 | if (!viewer_streams_ht) { |
| 2562 | goto exit_relay_ctx_viewer_streams; |
| 2563 | } |
| 2564 | |
| 2565 | /* Initialize thread health monitoring */ |
| 2566 | health_relayd = health_app_create(NR_HEALTH_RELAYD_TYPES); |
| 2567 | if (!health_relayd) { |
| 2568 | PERROR("health_app_create error"); |
| 2569 | goto exit_health_app_create; |
| 2570 | } |
| 2571 | |
| 2572 | /* Setup the dispatcher thread */ |
| 2573 | ret = pthread_create(&dispatcher_thread, NULL, |
| 2574 | relay_thread_dispatcher, (void *) NULL); |
| 2575 | if (ret != 0) { |
| 2576 | PERROR("pthread_create dispatcher"); |
| 2577 | goto exit_dispatcher; |
| 2578 | } |
| 2579 | |
| 2580 | /* Setup the worker thread */ |
| 2581 | ret = pthread_create(&worker_thread, NULL, |
| 2582 | relay_thread_worker, (void *) relay_ctx); |
| 2583 | if (ret != 0) { |
| 2584 | PERROR("pthread_create worker"); |
| 2585 | goto exit_worker; |
| 2586 | } |
| 2587 | |
| 2588 | /* Setup the listener thread */ |
| 2589 | ret = pthread_create(&listener_thread, NULL, |
| 2590 | relay_thread_listener, (void *) NULL); |
| 2591 | if (ret != 0) { |
| 2592 | PERROR("pthread_create listener"); |
| 2593 | goto exit_listener; |
| 2594 | } |
| 2595 | |
| 2596 | ret = live_start_threads(live_uri, relay_ctx, thread_quit_pipe); |
| 2597 | if (ret != 0) { |
| 2598 | ERR("Starting live viewer threads"); |
| 2599 | goto exit_live; |
| 2600 | } |
| 2601 | |
| 2602 | live_stop_threads(); |
| 2603 | |
| 2604 | exit_live: |
| 2605 | ret = pthread_join(listener_thread, &status); |
| 2606 | if (ret != 0) { |
| 2607 | PERROR("pthread_join"); |
| 2608 | goto error; /* join error, exit without cleanup */ |
| 2609 | } |
| 2610 | |
| 2611 | exit_listener: |
| 2612 | ret = pthread_join(worker_thread, &status); |
| 2613 | if (ret != 0) { |
| 2614 | PERROR("pthread_join"); |
| 2615 | goto error; /* join error, exit without cleanup */ |
| 2616 | } |
| 2617 | |
| 2618 | exit_worker: |
| 2619 | ret = pthread_join(dispatcher_thread, &status); |
| 2620 | if (ret != 0) { |
| 2621 | PERROR("pthread_join"); |
| 2622 | goto error; /* join error, exit without cleanup */ |
| 2623 | } |
| 2624 | |
| 2625 | exit_dispatcher: |
| 2626 | health_app_destroy(health_relayd); |
| 2627 | |
| 2628 | exit_health_app_create: |
| 2629 | lttng_ht_destroy(viewer_streams_ht); |
| 2630 | |
| 2631 | exit_relay_ctx_viewer_streams: |
| 2632 | lttng_ht_destroy(relay_streams_ht); |
| 2633 | |
| 2634 | exit_relay_ctx_streams: |
| 2635 | lttng_ht_destroy(relay_ctx->sessions_ht); |
| 2636 | |
| 2637 | exit_relay_ctx_sessions: |
| 2638 | free(relay_ctx); |
| 2639 | |
| 2640 | exit: |
| 2641 | cleanup(); |
| 2642 | if (!ret) { |
| 2643 | exit(EXIT_SUCCESS); |
| 2644 | } |
| 2645 | |
| 2646 | error: |
| 2647 | exit(EXIT_FAILURE); |
| 2648 | } |