| 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/hashtable/hashtable.h> |
| 51 | #include <common/sessiond-comm/relayd.h> |
| 52 | #include <common/uri.h> |
| 53 | #include <common/utils.h> |
| 54 | |
| 55 | #include "lttng-relayd.h" |
| 56 | |
| 57 | /* command line options */ |
| 58 | static int opt_daemon; |
| 59 | static char *opt_output_path; |
| 60 | static struct lttng_uri *control_uri; |
| 61 | static struct lttng_uri *data_uri; |
| 62 | |
| 63 | const char *progname; |
| 64 | static int is_root; /* Set to 1 if the daemon is running as root */ |
| 65 | |
| 66 | /* |
| 67 | * Quit pipe for all threads. This permits a single cancellation point |
| 68 | * for all threads when receiving an event on the pipe. |
| 69 | */ |
| 70 | static int thread_quit_pipe[2] = { -1, -1 }; |
| 71 | |
| 72 | /* |
| 73 | * This pipe is used to inform the worker thread that a command is queued and |
| 74 | * ready to be processed. |
| 75 | */ |
| 76 | static int relay_cmd_pipe[2] = { -1, -1 }; |
| 77 | |
| 78 | /* Shared between threads */ |
| 79 | static int dispatch_thread_exit; |
| 80 | |
| 81 | static pthread_t listener_thread; |
| 82 | static pthread_t dispatcher_thread; |
| 83 | static pthread_t worker_thread; |
| 84 | |
| 85 | static uint64_t last_relay_stream_id; |
| 86 | static uint64_t last_relay_session_id; |
| 87 | |
| 88 | /* |
| 89 | * Relay command queue. |
| 90 | * |
| 91 | * The relay_thread_listener and relay_thread_dispatcher communicate with this |
| 92 | * queue. |
| 93 | */ |
| 94 | static struct relay_cmd_queue relay_cmd_queue; |
| 95 | |
| 96 | /* buffer allocated at startup, used to store the trace data */ |
| 97 | static char *data_buffer; |
| 98 | static unsigned int data_buffer_size; |
| 99 | |
| 100 | /* |
| 101 | * usage function on stderr |
| 102 | */ |
| 103 | static |
| 104 | void usage(void) |
| 105 | { |
| 106 | fprintf(stderr, "Usage: %s OPTIONS\n\nOptions:\n", progname); |
| 107 | fprintf(stderr, " -h, --help Display this usage.\n"); |
| 108 | fprintf(stderr, " -d, --daemonize Start as a daemon.\n"); |
| 109 | fprintf(stderr, " -C, --control-port Control port listening (URI)\n"); |
| 110 | fprintf(stderr, " -D, --data-port Data port listening (URI)\n"); |
| 111 | fprintf(stderr, " -o, --output Output path for traces (PATH)\n"); |
| 112 | fprintf(stderr, " -v, --verbose Verbose mode. Activate DBG() macro.\n"); |
| 113 | } |
| 114 | |
| 115 | static |
| 116 | int parse_args(int argc, char **argv) |
| 117 | { |
| 118 | int c; |
| 119 | int ret = 0; |
| 120 | char *default_address; |
| 121 | |
| 122 | static struct option long_options[] = { |
| 123 | { "control-port", 1, 0, 'C', }, |
| 124 | { "data-port", 1, 0, 'D', }, |
| 125 | { "daemonize", 0, 0, 'd', }, |
| 126 | { "help", 0, 0, 'h', }, |
| 127 | { "output", 1, 0, 'o', }, |
| 128 | { "verbose", 0, 0, 'v', }, |
| 129 | { NULL, 0, 0, 0, }, |
| 130 | }; |
| 131 | |
| 132 | while (1) { |
| 133 | int option_index = 0; |
| 134 | c = getopt_long(argc, argv, "dhv" "C:D:o:", |
| 135 | long_options, &option_index); |
| 136 | if (c == -1) { |
| 137 | break; |
| 138 | } |
| 139 | |
| 140 | switch (c) { |
| 141 | case 0: |
| 142 | fprintf(stderr, "option %s", long_options[option_index].name); |
| 143 | if (optarg) { |
| 144 | fprintf(stderr, " with arg %s\n", optarg); |
| 145 | } |
| 146 | break; |
| 147 | case 'C': |
| 148 | ret = uri_parse(optarg, &control_uri); |
| 149 | if (ret < 0) { |
| 150 | ERR("Invalid control URI specified"); |
| 151 | goto exit; |
| 152 | } |
| 153 | if (control_uri->port == 0) { |
| 154 | control_uri->port = DEFAULT_NETWORK_CONTROL_PORT; |
| 155 | } |
| 156 | break; |
| 157 | case 'D': |
| 158 | ret = uri_parse(optarg, &data_uri); |
| 159 | if (ret < 0) { |
| 160 | ERR("Invalid data URI specified"); |
| 161 | goto exit; |
| 162 | } |
| 163 | if (data_uri->port == 0) { |
| 164 | data_uri->port = DEFAULT_NETWORK_DATA_PORT; |
| 165 | } |
| 166 | break; |
| 167 | case 'd': |
| 168 | opt_daemon = 1; |
| 169 | break; |
| 170 | case 'h': |
| 171 | usage(); |
| 172 | exit(EXIT_FAILURE); |
| 173 | case 'o': |
| 174 | ret = asprintf(&opt_output_path, "%s", optarg); |
| 175 | if (ret < 0) { |
| 176 | PERROR("asprintf opt_output_path"); |
| 177 | goto exit; |
| 178 | } |
| 179 | break; |
| 180 | case 'v': |
| 181 | /* Verbose level can increase using multiple -v */ |
| 182 | lttng_opt_verbose += 1; |
| 183 | break; |
| 184 | default: |
| 185 | /* Unknown option or other error. |
| 186 | * Error is printed by getopt, just return */ |
| 187 | ret = -1; |
| 188 | goto exit; |
| 189 | } |
| 190 | } |
| 191 | |
| 192 | /* assign default values */ |
| 193 | if (control_uri == NULL) { |
| 194 | ret = asprintf(&default_address, "tcp://0.0.0.0:%d", |
| 195 | DEFAULT_NETWORK_CONTROL_PORT); |
| 196 | if (ret < 0) { |
| 197 | PERROR("asprintf default data address"); |
| 198 | goto exit; |
| 199 | } |
| 200 | |
| 201 | ret = uri_parse(default_address, &control_uri); |
| 202 | free(default_address); |
| 203 | if (ret < 0) { |
| 204 | ERR("Invalid control URI specified"); |
| 205 | goto exit; |
| 206 | } |
| 207 | } |
| 208 | if (data_uri == NULL) { |
| 209 | ret = asprintf(&default_address, "tcp://0.0.0.0:%d", |
| 210 | DEFAULT_NETWORK_DATA_PORT); |
| 211 | if (ret < 0) { |
| 212 | PERROR("asprintf default data address"); |
| 213 | goto exit; |
| 214 | } |
| 215 | |
| 216 | ret = uri_parse(default_address, &data_uri); |
| 217 | free(default_address); |
| 218 | if (ret < 0) { |
| 219 | ERR("Invalid data URI specified"); |
| 220 | goto exit; |
| 221 | } |
| 222 | } |
| 223 | |
| 224 | exit: |
| 225 | return ret; |
| 226 | } |
| 227 | |
| 228 | /* |
| 229 | * Cleanup the daemon |
| 230 | */ |
| 231 | static |
| 232 | void cleanup(void) |
| 233 | { |
| 234 | DBG("Cleaning up"); |
| 235 | |
| 236 | /* free the dynamically allocated opt_output_path */ |
| 237 | free(opt_output_path); |
| 238 | |
| 239 | /* Close thread quit pipes */ |
| 240 | utils_close_pipe(thread_quit_pipe); |
| 241 | |
| 242 | uri_free(control_uri); |
| 243 | uri_free(data_uri); |
| 244 | } |
| 245 | |
| 246 | /* |
| 247 | * Write to writable pipe used to notify a thread. |
| 248 | */ |
| 249 | static |
| 250 | int notify_thread_pipe(int wpipe) |
| 251 | { |
| 252 | int ret; |
| 253 | |
| 254 | do { |
| 255 | ret = write(wpipe, "!", 1); |
| 256 | } while (ret < 0 && errno == EINTR); |
| 257 | if (ret < 0 || ret != 1) { |
| 258 | PERROR("write poll pipe"); |
| 259 | } |
| 260 | |
| 261 | return ret; |
| 262 | } |
| 263 | |
| 264 | /* |
| 265 | * Stop all threads by closing the thread quit pipe. |
| 266 | */ |
| 267 | static |
| 268 | void stop_threads(void) |
| 269 | { |
| 270 | int ret; |
| 271 | |
| 272 | /* Stopping all threads */ |
| 273 | DBG("Terminating all threads"); |
| 274 | ret = notify_thread_pipe(thread_quit_pipe[1]); |
| 275 | if (ret < 0) { |
| 276 | ERR("write error on thread quit pipe"); |
| 277 | } |
| 278 | |
| 279 | /* Dispatch thread */ |
| 280 | CMM_STORE_SHARED(dispatch_thread_exit, 1); |
| 281 | futex_nto1_wake(&relay_cmd_queue.futex); |
| 282 | } |
| 283 | |
| 284 | /* |
| 285 | * Signal handler for the daemon |
| 286 | * |
| 287 | * Simply stop all worker threads, leaving main() return gracefully after |
| 288 | * joining all threads and calling cleanup(). |
| 289 | */ |
| 290 | static |
| 291 | void sighandler(int sig) |
| 292 | { |
| 293 | switch (sig) { |
| 294 | case SIGPIPE: |
| 295 | DBG("SIGPIPE caught"); |
| 296 | return; |
| 297 | case SIGINT: |
| 298 | DBG("SIGINT caught"); |
| 299 | stop_threads(); |
| 300 | break; |
| 301 | case SIGTERM: |
| 302 | DBG("SIGTERM caught"); |
| 303 | stop_threads(); |
| 304 | break; |
| 305 | default: |
| 306 | break; |
| 307 | } |
| 308 | } |
| 309 | |
| 310 | /* |
| 311 | * Setup signal handler for : |
| 312 | * SIGINT, SIGTERM, SIGPIPE |
| 313 | */ |
| 314 | static |
| 315 | int set_signal_handler(void) |
| 316 | { |
| 317 | int ret = 0; |
| 318 | struct sigaction sa; |
| 319 | sigset_t sigset; |
| 320 | |
| 321 | if ((ret = sigemptyset(&sigset)) < 0) { |
| 322 | PERROR("sigemptyset"); |
| 323 | return ret; |
| 324 | } |
| 325 | |
| 326 | sa.sa_handler = sighandler; |
| 327 | sa.sa_mask = sigset; |
| 328 | sa.sa_flags = 0; |
| 329 | if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) { |
| 330 | PERROR("sigaction"); |
| 331 | return ret; |
| 332 | } |
| 333 | |
| 334 | if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) { |
| 335 | PERROR("sigaction"); |
| 336 | return ret; |
| 337 | } |
| 338 | |
| 339 | if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) { |
| 340 | PERROR("sigaction"); |
| 341 | return ret; |
| 342 | } |
| 343 | |
| 344 | DBG("Signal handler set for SIGTERM, SIGPIPE and SIGINT"); |
| 345 | |
| 346 | return ret; |
| 347 | } |
| 348 | |
| 349 | /* |
| 350 | * Init thread quit pipe. |
| 351 | * |
| 352 | * Return -1 on error or 0 if all pipes are created. |
| 353 | */ |
| 354 | static |
| 355 | int init_thread_quit_pipe(void) |
| 356 | { |
| 357 | int ret; |
| 358 | |
| 359 | ret = utils_create_pipe_cloexec(thread_quit_pipe); |
| 360 | |
| 361 | return ret; |
| 362 | } |
| 363 | |
| 364 | /* |
| 365 | * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set. |
| 366 | */ |
| 367 | static |
| 368 | int create_thread_poll_set(struct lttng_poll_event *events, int size) |
| 369 | { |
| 370 | int ret; |
| 371 | |
| 372 | if (events == NULL || size == 0) { |
| 373 | ret = -1; |
| 374 | goto error; |
| 375 | } |
| 376 | |
| 377 | ret = lttng_poll_create(events, size, LTTNG_CLOEXEC); |
| 378 | if (ret < 0) { |
| 379 | goto error; |
| 380 | } |
| 381 | |
| 382 | /* Add quit pipe */ |
| 383 | ret = lttng_poll_add(events, thread_quit_pipe[0], LPOLLIN); |
| 384 | if (ret < 0) { |
| 385 | goto error; |
| 386 | } |
| 387 | |
| 388 | return 0; |
| 389 | |
| 390 | error: |
| 391 | return ret; |
| 392 | } |
| 393 | |
| 394 | /* |
| 395 | * Check if the thread quit pipe was triggered. |
| 396 | * |
| 397 | * Return 1 if it was triggered else 0; |
| 398 | */ |
| 399 | static |
| 400 | int check_thread_quit_pipe(int fd, uint32_t events) |
| 401 | { |
| 402 | if (fd == thread_quit_pipe[0] && (events & LPOLLIN)) { |
| 403 | return 1; |
| 404 | } |
| 405 | |
| 406 | return 0; |
| 407 | } |
| 408 | |
| 409 | /* |
| 410 | * Create and init socket from uri. |
| 411 | */ |
| 412 | static |
| 413 | struct lttcomm_sock *relay_init_sock(struct lttng_uri *uri) |
| 414 | { |
| 415 | int ret; |
| 416 | struct lttcomm_sock *sock = NULL; |
| 417 | |
| 418 | sock = lttcomm_alloc_sock_from_uri(uri); |
| 419 | if (sock == NULL) { |
| 420 | ERR("Allocating socket"); |
| 421 | goto error; |
| 422 | } |
| 423 | |
| 424 | ret = lttcomm_create_sock(sock); |
| 425 | if (ret < 0) { |
| 426 | goto error; |
| 427 | } |
| 428 | DBG("Listening on sock %d", sock->fd); |
| 429 | |
| 430 | ret = sock->ops->bind(sock); |
| 431 | if (ret < 0) { |
| 432 | goto error; |
| 433 | } |
| 434 | |
| 435 | ret = sock->ops->listen(sock, -1); |
| 436 | if (ret < 0) { |
| 437 | goto error; |
| 438 | |
| 439 | } |
| 440 | |
| 441 | return sock; |
| 442 | |
| 443 | error: |
| 444 | if (sock) { |
| 445 | lttcomm_destroy_sock(sock); |
| 446 | } |
| 447 | return NULL; |
| 448 | } |
| 449 | |
| 450 | /* |
| 451 | * Return nonzero if stream needs to be closed. |
| 452 | */ |
| 453 | static |
| 454 | int close_stream_check(struct relay_stream *stream) |
| 455 | { |
| 456 | |
| 457 | if (stream->close_flag && stream->prev_seq == stream->last_net_seq_num) { |
| 458 | /* |
| 459 | * We are about to close the stream so set the data pending flag to 1 |
| 460 | * which will make the end data pending command skip the stream which |
| 461 | * is now closed and ready. Note that after proceeding to a file close, |
| 462 | * the written file is ready for reading. |
| 463 | */ |
| 464 | stream->data_pending_check_done = 1; |
| 465 | return 1; |
| 466 | } |
| 467 | return 0; |
| 468 | } |
| 469 | |
| 470 | /* |
| 471 | * This thread manages the listening for new connections on the network |
| 472 | */ |
| 473 | static |
| 474 | void *relay_thread_listener(void *data) |
| 475 | { |
| 476 | int i, ret, pollfd, err = -1; |
| 477 | int val = 1; |
| 478 | uint32_t revents, nb_fd; |
| 479 | struct lttng_poll_event events; |
| 480 | struct lttcomm_sock *control_sock, *data_sock; |
| 481 | |
| 482 | DBG("[thread] Relay listener started"); |
| 483 | |
| 484 | control_sock = relay_init_sock(control_uri); |
| 485 | if (!control_sock) { |
| 486 | goto error_sock_control; |
| 487 | } |
| 488 | |
| 489 | data_sock = relay_init_sock(data_uri); |
| 490 | if (!data_sock) { |
| 491 | goto error_sock_relay; |
| 492 | } |
| 493 | |
| 494 | /* |
| 495 | * Pass 3 as size here for the thread quit pipe, control and data socket. |
| 496 | */ |
| 497 | ret = create_thread_poll_set(&events, 3); |
| 498 | if (ret < 0) { |
| 499 | goto error_create_poll; |
| 500 | } |
| 501 | |
| 502 | /* Add the control socket */ |
| 503 | ret = lttng_poll_add(&events, control_sock->fd, LPOLLIN | LPOLLRDHUP); |
| 504 | if (ret < 0) { |
| 505 | goto error_poll_add; |
| 506 | } |
| 507 | |
| 508 | /* Add the data socket */ |
| 509 | ret = lttng_poll_add(&events, data_sock->fd, LPOLLIN | LPOLLRDHUP); |
| 510 | if (ret < 0) { |
| 511 | goto error_poll_add; |
| 512 | } |
| 513 | |
| 514 | while (1) { |
| 515 | DBG("Listener accepting connections"); |
| 516 | |
| 517 | restart: |
| 518 | ret = lttng_poll_wait(&events, -1); |
| 519 | if (ret < 0) { |
| 520 | /* |
| 521 | * Restart interrupted system call. |
| 522 | */ |
| 523 | if (errno == EINTR) { |
| 524 | goto restart; |
| 525 | } |
| 526 | goto error; |
| 527 | } |
| 528 | |
| 529 | nb_fd = ret; |
| 530 | |
| 531 | DBG("Relay new connection received"); |
| 532 | for (i = 0; i < nb_fd; i++) { |
| 533 | /* Fetch once the poll data */ |
| 534 | revents = LTTNG_POLL_GETEV(&events, i); |
| 535 | pollfd = LTTNG_POLL_GETFD(&events, i); |
| 536 | |
| 537 | /* Thread quit pipe has been closed. Killing thread. */ |
| 538 | ret = check_thread_quit_pipe(pollfd, revents); |
| 539 | if (ret) { |
| 540 | err = 0; |
| 541 | goto exit; |
| 542 | } |
| 543 | |
| 544 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { |
| 545 | ERR("socket poll error"); |
| 546 | goto error; |
| 547 | } else if (revents & LPOLLIN) { |
| 548 | /* |
| 549 | * Get allocated in this thread, |
| 550 | * enqueued to a global queue, dequeued |
| 551 | * and freed in the worker thread. |
| 552 | */ |
| 553 | struct relay_command *relay_cmd; |
| 554 | struct lttcomm_sock *newsock; |
| 555 | |
| 556 | relay_cmd = zmalloc(sizeof(struct relay_command)); |
| 557 | if (relay_cmd == NULL) { |
| 558 | PERROR("relay command zmalloc"); |
| 559 | goto error; |
| 560 | } |
| 561 | |
| 562 | if (pollfd == data_sock->fd) { |
| 563 | newsock = data_sock->ops->accept(data_sock); |
| 564 | if (!newsock) { |
| 565 | PERROR("accepting data sock"); |
| 566 | free(relay_cmd); |
| 567 | goto error; |
| 568 | } |
| 569 | relay_cmd->type = RELAY_DATA; |
| 570 | DBG("Relay data connection accepted, socket %d", newsock->fd); |
| 571 | } else { |
| 572 | assert(pollfd == control_sock->fd); |
| 573 | newsock = control_sock->ops->accept(control_sock); |
| 574 | if (!newsock) { |
| 575 | PERROR("accepting control sock"); |
| 576 | free(relay_cmd); |
| 577 | goto error; |
| 578 | } |
| 579 | relay_cmd->type = RELAY_CONTROL; |
| 580 | DBG("Relay control connection accepted, socket %d", newsock->fd); |
| 581 | } |
| 582 | ret = setsockopt(newsock->fd, SOL_SOCKET, SO_REUSEADDR, |
| 583 | &val, sizeof(int)); |
| 584 | if (ret < 0) { |
| 585 | PERROR("setsockopt inet"); |
| 586 | lttcomm_destroy_sock(newsock); |
| 587 | free(relay_cmd); |
| 588 | goto error; |
| 589 | } |
| 590 | relay_cmd->sock = newsock; |
| 591 | /* |
| 592 | * Lock free enqueue the request. |
| 593 | */ |
| 594 | cds_wfq_enqueue(&relay_cmd_queue.queue, &relay_cmd->node); |
| 595 | |
| 596 | /* |
| 597 | * Wake the dispatch queue futex. Implicit memory |
| 598 | * barrier with the exchange in cds_wfq_enqueue. |
| 599 | */ |
| 600 | futex_nto1_wake(&relay_cmd_queue.futex); |
| 601 | } |
| 602 | } |
| 603 | } |
| 604 | |
| 605 | exit: |
| 606 | error: |
| 607 | error_poll_add: |
| 608 | lttng_poll_clean(&events); |
| 609 | error_create_poll: |
| 610 | if (data_sock->fd >= 0) { |
| 611 | ret = data_sock->ops->close(data_sock); |
| 612 | if (ret) { |
| 613 | PERROR("close"); |
| 614 | } |
| 615 | } |
| 616 | lttcomm_destroy_sock(data_sock); |
| 617 | error_sock_relay: |
| 618 | if (control_sock->fd >= 0) { |
| 619 | ret = control_sock->ops->close(control_sock); |
| 620 | if (ret) { |
| 621 | PERROR("close"); |
| 622 | } |
| 623 | } |
| 624 | lttcomm_destroy_sock(control_sock); |
| 625 | error_sock_control: |
| 626 | if (err) { |
| 627 | DBG("Thread exited with error"); |
| 628 | } |
| 629 | DBG("Relay listener thread cleanup complete"); |
| 630 | stop_threads(); |
| 631 | return NULL; |
| 632 | } |
| 633 | |
| 634 | /* |
| 635 | * This thread manages the dispatching of the requests to worker threads |
| 636 | */ |
| 637 | static |
| 638 | void *relay_thread_dispatcher(void *data) |
| 639 | { |
| 640 | int ret; |
| 641 | struct cds_wfq_node *node; |
| 642 | struct relay_command *relay_cmd = NULL; |
| 643 | |
| 644 | DBG("[thread] Relay dispatcher started"); |
| 645 | |
| 646 | while (!CMM_LOAD_SHARED(dispatch_thread_exit)) { |
| 647 | /* Atomically prepare the queue futex */ |
| 648 | futex_nto1_prepare(&relay_cmd_queue.futex); |
| 649 | |
| 650 | do { |
| 651 | /* Dequeue commands */ |
| 652 | node = cds_wfq_dequeue_blocking(&relay_cmd_queue.queue); |
| 653 | if (node == NULL) { |
| 654 | DBG("Woken up but nothing in the relay command queue"); |
| 655 | /* Continue thread execution */ |
| 656 | break; |
| 657 | } |
| 658 | |
| 659 | relay_cmd = caa_container_of(node, struct relay_command, node); |
| 660 | DBG("Dispatching request waiting on sock %d", relay_cmd->sock->fd); |
| 661 | |
| 662 | /* |
| 663 | * Inform worker thread of the new request. This |
| 664 | * call is blocking so we can be assured that the data will be read |
| 665 | * at some point in time or wait to the end of the world :) |
| 666 | */ |
| 667 | do { |
| 668 | ret = write(relay_cmd_pipe[1], relay_cmd, |
| 669 | sizeof(struct relay_command)); |
| 670 | } while (ret < 0 && errno == EINTR); |
| 671 | free(relay_cmd); |
| 672 | if (ret < 0 || ret != sizeof(struct relay_command)) { |
| 673 | PERROR("write cmd pipe"); |
| 674 | goto error; |
| 675 | } |
| 676 | } while (node != NULL); |
| 677 | |
| 678 | /* Futex wait on queue. Blocking call on futex() */ |
| 679 | futex_nto1_wait(&relay_cmd_queue.futex); |
| 680 | } |
| 681 | |
| 682 | error: |
| 683 | DBG("Dispatch thread dying"); |
| 684 | stop_threads(); |
| 685 | return NULL; |
| 686 | } |
| 687 | |
| 688 | /* |
| 689 | * config_get_default_path |
| 690 | * |
| 691 | * Returns the HOME directory path. Caller MUST NOT free(3) the return pointer. |
| 692 | */ |
| 693 | static |
| 694 | char *config_get_default_path(void) |
| 695 | { |
| 696 | return getenv("HOME"); |
| 697 | } |
| 698 | |
| 699 | static |
| 700 | char *create_output_path_auto(char *path_name) |
| 701 | { |
| 702 | int ret; |
| 703 | char *traces_path = NULL; |
| 704 | char *alloc_path = NULL; |
| 705 | char *default_path; |
| 706 | |
| 707 | default_path = config_get_default_path(); |
| 708 | if (default_path == NULL) { |
| 709 | ERR("Home path not found.\n \ |
| 710 | Please specify an output path using -o, --output PATH"); |
| 711 | goto exit; |
| 712 | } |
| 713 | alloc_path = strdup(default_path); |
| 714 | if (alloc_path == NULL) { |
| 715 | PERROR("Path allocation"); |
| 716 | goto exit; |
| 717 | } |
| 718 | ret = asprintf(&traces_path, "%s/" DEFAULT_TRACE_DIR_NAME |
| 719 | "/%s", alloc_path, path_name); |
| 720 | if (ret < 0) { |
| 721 | PERROR("asprintf trace dir name"); |
| 722 | goto exit; |
| 723 | } |
| 724 | exit: |
| 725 | free(alloc_path); |
| 726 | return traces_path; |
| 727 | } |
| 728 | |
| 729 | static |
| 730 | char *create_output_path_noauto(char *path_name) |
| 731 | { |
| 732 | int ret; |
| 733 | char *traces_path = NULL; |
| 734 | char *full_path; |
| 735 | |
| 736 | full_path = utils_expand_path(opt_output_path); |
| 737 | ret = asprintf(&traces_path, "%s/%s", full_path, path_name); |
| 738 | if (ret < 0) { |
| 739 | PERROR("asprintf trace dir name"); |
| 740 | goto exit; |
| 741 | } |
| 742 | exit: |
| 743 | free(full_path); |
| 744 | return traces_path; |
| 745 | } |
| 746 | |
| 747 | /* |
| 748 | * create_output_path: create the output trace directory |
| 749 | */ |
| 750 | static |
| 751 | char *create_output_path(char *path_name) |
| 752 | { |
| 753 | if (opt_output_path == NULL) { |
| 754 | return create_output_path_auto(path_name); |
| 755 | } else { |
| 756 | return create_output_path_noauto(path_name); |
| 757 | } |
| 758 | } |
| 759 | |
| 760 | /* |
| 761 | * Get stream from stream id. |
| 762 | * Need to be called with RCU read-side lock held. |
| 763 | */ |
| 764 | static |
| 765 | struct relay_stream *relay_stream_from_stream_id(uint64_t stream_id, |
| 766 | struct lttng_ht *streams_ht) |
| 767 | { |
| 768 | struct lttng_ht_node_ulong *node; |
| 769 | struct lttng_ht_iter iter; |
| 770 | struct relay_stream *ret; |
| 771 | |
| 772 | lttng_ht_lookup(streams_ht, |
| 773 | (void *)((unsigned long) stream_id), |
| 774 | &iter); |
| 775 | node = lttng_ht_iter_get_node_ulong(&iter); |
| 776 | if (node == NULL) { |
| 777 | DBG("Relay stream %" PRIu64 " not found", stream_id); |
| 778 | ret = NULL; |
| 779 | goto end; |
| 780 | } |
| 781 | |
| 782 | ret = caa_container_of(node, struct relay_stream, stream_n); |
| 783 | |
| 784 | end: |
| 785 | return ret; |
| 786 | } |
| 787 | |
| 788 | static |
| 789 | void deferred_free_stream(struct rcu_head *head) |
| 790 | { |
| 791 | struct relay_stream *stream = |
| 792 | caa_container_of(head, struct relay_stream, rcu_node); |
| 793 | free(stream); |
| 794 | } |
| 795 | |
| 796 | /* |
| 797 | * relay_delete_session: Free all memory associated with a session and |
| 798 | * close all the FDs |
| 799 | */ |
| 800 | static |
| 801 | void relay_delete_session(struct relay_command *cmd, struct lttng_ht *streams_ht) |
| 802 | { |
| 803 | struct lttng_ht_iter iter; |
| 804 | struct lttng_ht_node_ulong *node; |
| 805 | struct relay_stream *stream; |
| 806 | int ret; |
| 807 | |
| 808 | if (!cmd->session) { |
| 809 | return; |
| 810 | } |
| 811 | |
| 812 | DBG("Relay deleting session %" PRIu64, cmd->session->id); |
| 813 | |
| 814 | rcu_read_lock(); |
| 815 | cds_lfht_for_each_entry(streams_ht->ht, &iter.iter, node, node) { |
| 816 | node = lttng_ht_iter_get_node_ulong(&iter); |
| 817 | if (node) { |
| 818 | stream = caa_container_of(node, |
| 819 | struct relay_stream, stream_n); |
| 820 | if (stream->session == cmd->session) { |
| 821 | ret = close(stream->fd); |
| 822 | if (ret < 0) { |
| 823 | PERROR("close stream fd on delete session"); |
| 824 | } |
| 825 | ret = lttng_ht_del(streams_ht, &iter); |
| 826 | assert(!ret); |
| 827 | call_rcu(&stream->rcu_node, |
| 828 | deferred_free_stream); |
| 829 | } |
| 830 | } |
| 831 | } |
| 832 | rcu_read_unlock(); |
| 833 | |
| 834 | free(cmd->session); |
| 835 | } |
| 836 | |
| 837 | /* |
| 838 | * Handle the RELAYD_CREATE_SESSION command. |
| 839 | * |
| 840 | * On success, send back the session id or else return a negative value. |
| 841 | */ |
| 842 | static |
| 843 | int relay_create_session(struct lttcomm_relayd_hdr *recv_hdr, |
| 844 | struct relay_command *cmd) |
| 845 | { |
| 846 | int ret = 0, send_ret; |
| 847 | struct relay_session *session; |
| 848 | struct lttcomm_relayd_status_session reply; |
| 849 | |
| 850 | assert(recv_hdr); |
| 851 | assert(cmd); |
| 852 | |
| 853 | memset(&reply, 0, sizeof(reply)); |
| 854 | |
| 855 | session = zmalloc(sizeof(struct relay_session)); |
| 856 | if (session == NULL) { |
| 857 | PERROR("relay session zmalloc"); |
| 858 | ret = -1; |
| 859 | goto error; |
| 860 | } |
| 861 | |
| 862 | session->id = ++last_relay_session_id; |
| 863 | session->sock = cmd->sock; |
| 864 | cmd->session = session; |
| 865 | |
| 866 | reply.session_id = htobe64(session->id); |
| 867 | |
| 868 | DBG("Created session %" PRIu64, session->id); |
| 869 | |
| 870 | error: |
| 871 | if (ret < 0) { |
| 872 | reply.ret_code = htobe32(LTTNG_ERR_FATAL); |
| 873 | } else { |
| 874 | reply.ret_code = htobe32(LTTNG_OK); |
| 875 | } |
| 876 | |
| 877 | send_ret = cmd->sock->ops->sendmsg(cmd->sock, &reply, sizeof(reply), 0); |
| 878 | if (send_ret < 0) { |
| 879 | ERR("Relayd sending session id"); |
| 880 | ret = send_ret; |
| 881 | } |
| 882 | |
| 883 | return ret; |
| 884 | } |
| 885 | |
| 886 | /* |
| 887 | * relay_add_stream: allocate a new stream for a session |
| 888 | */ |
| 889 | static |
| 890 | int relay_add_stream(struct lttcomm_relayd_hdr *recv_hdr, |
| 891 | struct relay_command *cmd, struct lttng_ht *streams_ht) |
| 892 | { |
| 893 | struct relay_session *session = cmd->session; |
| 894 | struct lttcomm_relayd_add_stream stream_info; |
| 895 | struct relay_stream *stream = NULL; |
| 896 | struct lttcomm_relayd_status_stream reply; |
| 897 | char *path = NULL, *root_path = NULL; |
| 898 | int ret, send_ret; |
| 899 | |
| 900 | if (!session || cmd->version_check_done == 0) { |
| 901 | ERR("Trying to add a stream before version check"); |
| 902 | ret = -1; |
| 903 | goto end_no_session; |
| 904 | } |
| 905 | |
| 906 | ret = cmd->sock->ops->recvmsg(cmd->sock, &stream_info, |
| 907 | sizeof(struct lttcomm_relayd_add_stream), 0); |
| 908 | if (ret < sizeof(struct lttcomm_relayd_add_stream)) { |
| 909 | if (ret == 0) { |
| 910 | /* Orderly shutdown. Not necessary to print an error. */ |
| 911 | DBG("Socket %d did an orderly shutdown", cmd->sock->fd); |
| 912 | } else { |
| 913 | ERR("Relay didn't receive valid add_stream struct size : %d", ret); |
| 914 | } |
| 915 | ret = -1; |
| 916 | goto end_no_session; |
| 917 | } |
| 918 | stream = zmalloc(sizeof(struct relay_stream)); |
| 919 | if (stream == NULL) { |
| 920 | PERROR("relay stream zmalloc"); |
| 921 | ret = -1; |
| 922 | goto end_no_session; |
| 923 | } |
| 924 | |
| 925 | rcu_read_lock(); |
| 926 | stream->stream_handle = ++last_relay_stream_id; |
| 927 | stream->prev_seq = -1ULL; |
| 928 | stream->session = session; |
| 929 | |
| 930 | root_path = create_output_path(stream_info.pathname); |
| 931 | if (!root_path) { |
| 932 | ret = -1; |
| 933 | goto end; |
| 934 | } |
| 935 | ret = utils_mkdir_recursive(root_path, S_IRWXU | S_IRWXG); |
| 936 | if (ret < 0) { |
| 937 | ERR("relay creating output directory"); |
| 938 | goto end; |
| 939 | } |
| 940 | |
| 941 | ret = asprintf(&path, "%s/%s", root_path, stream_info.channel_name); |
| 942 | if (ret < 0) { |
| 943 | PERROR("asprintf stream path"); |
| 944 | goto end; |
| 945 | } |
| 946 | |
| 947 | ret = open(path, O_WRONLY|O_CREAT|O_TRUNC, S_IRWXU|S_IRWXG|S_IRWXO); |
| 948 | if (ret < 0) { |
| 949 | PERROR("Relay creating trace file"); |
| 950 | goto end; |
| 951 | } |
| 952 | |
| 953 | stream->fd = ret; |
| 954 | DBG("Tracefile %s created", path); |
| 955 | |
| 956 | lttng_ht_node_init_ulong(&stream->stream_n, |
| 957 | (unsigned long) stream->stream_handle); |
| 958 | lttng_ht_add_unique_ulong(streams_ht, |
| 959 | &stream->stream_n); |
| 960 | |
| 961 | DBG("Relay new stream added %s", stream_info.channel_name); |
| 962 | |
| 963 | end: |
| 964 | free(path); |
| 965 | free(root_path); |
| 966 | /* send the session id to the client or a negative return code on error */ |
| 967 | if (ret < 0) { |
| 968 | reply.ret_code = htobe32(LTTNG_ERR_UNK); |
| 969 | } else { |
| 970 | reply.ret_code = htobe32(LTTNG_OK); |
| 971 | } |
| 972 | reply.handle = htobe64(stream->stream_handle); |
| 973 | send_ret = cmd->sock->ops->sendmsg(cmd->sock, &reply, |
| 974 | sizeof(struct lttcomm_relayd_status_stream), 0); |
| 975 | if (send_ret < 0) { |
| 976 | ERR("Relay sending stream id"); |
| 977 | ret = send_ret; |
| 978 | } |
| 979 | rcu_read_unlock(); |
| 980 | |
| 981 | end_no_session: |
| 982 | return ret; |
| 983 | } |
| 984 | |
| 985 | /* |
| 986 | * relay_close_stream: close a specific stream |
| 987 | */ |
| 988 | static |
| 989 | int relay_close_stream(struct lttcomm_relayd_hdr *recv_hdr, |
| 990 | struct relay_command *cmd, struct lttng_ht *streams_ht) |
| 991 | { |
| 992 | struct relay_session *session = cmd->session; |
| 993 | struct lttcomm_relayd_close_stream stream_info; |
| 994 | struct lttcomm_relayd_generic_reply reply; |
| 995 | struct relay_stream *stream; |
| 996 | int ret, send_ret; |
| 997 | struct lttng_ht_iter iter; |
| 998 | |
| 999 | DBG("Close stream received"); |
| 1000 | |
| 1001 | if (!session || cmd->version_check_done == 0) { |
| 1002 | ERR("Trying to close a stream before version check"); |
| 1003 | ret = -1; |
| 1004 | goto end_no_session; |
| 1005 | } |
| 1006 | |
| 1007 | ret = cmd->sock->ops->recvmsg(cmd->sock, &stream_info, |
| 1008 | sizeof(struct lttcomm_relayd_close_stream), 0); |
| 1009 | if (ret < sizeof(struct lttcomm_relayd_close_stream)) { |
| 1010 | if (ret == 0) { |
| 1011 | /* Orderly shutdown. Not necessary to print an error. */ |
| 1012 | DBG("Socket %d did an orderly shutdown", cmd->sock->fd); |
| 1013 | } else { |
| 1014 | ERR("Relay didn't receive valid add_stream struct size : %d", ret); |
| 1015 | } |
| 1016 | ret = -1; |
| 1017 | goto end_no_session; |
| 1018 | } |
| 1019 | |
| 1020 | rcu_read_lock(); |
| 1021 | stream = relay_stream_from_stream_id(be64toh(stream_info.stream_id), |
| 1022 | streams_ht); |
| 1023 | if (!stream) { |
| 1024 | ret = -1; |
| 1025 | goto end_unlock; |
| 1026 | } |
| 1027 | |
| 1028 | stream->last_net_seq_num = be64toh(stream_info.last_net_seq_num); |
| 1029 | stream->close_flag = 1; |
| 1030 | |
| 1031 | if (close_stream_check(stream)) { |
| 1032 | int delret; |
| 1033 | |
| 1034 | delret = close(stream->fd); |
| 1035 | if (delret < 0) { |
| 1036 | PERROR("close stream"); |
| 1037 | } |
| 1038 | iter.iter.node = &stream->stream_n.node; |
| 1039 | delret = lttng_ht_del(streams_ht, &iter); |
| 1040 | assert(!delret); |
| 1041 | call_rcu(&stream->rcu_node, |
| 1042 | deferred_free_stream); |
| 1043 | DBG("Closed tracefile %d from close stream", stream->fd); |
| 1044 | } |
| 1045 | |
| 1046 | end_unlock: |
| 1047 | rcu_read_unlock(); |
| 1048 | |
| 1049 | if (ret < 0) { |
| 1050 | reply.ret_code = htobe32(LTTNG_ERR_UNK); |
| 1051 | } else { |
| 1052 | reply.ret_code = htobe32(LTTNG_OK); |
| 1053 | } |
| 1054 | send_ret = cmd->sock->ops->sendmsg(cmd->sock, &reply, |
| 1055 | sizeof(struct lttcomm_relayd_generic_reply), 0); |
| 1056 | if (send_ret < 0) { |
| 1057 | ERR("Relay sending stream id"); |
| 1058 | ret = send_ret; |
| 1059 | } |
| 1060 | |
| 1061 | end_no_session: |
| 1062 | return ret; |
| 1063 | } |
| 1064 | |
| 1065 | /* |
| 1066 | * relay_unknown_command: send -1 if received unknown command |
| 1067 | */ |
| 1068 | static |
| 1069 | void relay_unknown_command(struct relay_command *cmd) |
| 1070 | { |
| 1071 | struct lttcomm_relayd_generic_reply reply; |
| 1072 | int ret; |
| 1073 | |
| 1074 | reply.ret_code = htobe32(LTTNG_ERR_UNK); |
| 1075 | ret = cmd->sock->ops->sendmsg(cmd->sock, &reply, |
| 1076 | sizeof(struct lttcomm_relayd_generic_reply), 0); |
| 1077 | if (ret < 0) { |
| 1078 | ERR("Relay sending unknown command"); |
| 1079 | } |
| 1080 | } |
| 1081 | |
| 1082 | /* |
| 1083 | * relay_start: send an acknowledgment to the client to tell if we are |
| 1084 | * ready to receive data. We are ready if a session is established. |
| 1085 | */ |
| 1086 | static |
| 1087 | int relay_start(struct lttcomm_relayd_hdr *recv_hdr, |
| 1088 | struct relay_command *cmd) |
| 1089 | { |
| 1090 | int ret = htobe32(LTTNG_OK); |
| 1091 | struct lttcomm_relayd_generic_reply reply; |
| 1092 | struct relay_session *session = cmd->session; |
| 1093 | |
| 1094 | if (!session) { |
| 1095 | DBG("Trying to start the streaming without a session established"); |
| 1096 | ret = htobe32(LTTNG_ERR_UNK); |
| 1097 | } |
| 1098 | |
| 1099 | reply.ret_code = ret; |
| 1100 | ret = cmd->sock->ops->sendmsg(cmd->sock, &reply, |
| 1101 | sizeof(struct lttcomm_relayd_generic_reply), 0); |
| 1102 | if (ret < 0) { |
| 1103 | ERR("Relay sending start ack"); |
| 1104 | } |
| 1105 | |
| 1106 | return ret; |
| 1107 | } |
| 1108 | |
| 1109 | /* |
| 1110 | * Append padding to the file pointed by the file descriptor fd. |
| 1111 | */ |
| 1112 | static int write_padding_to_file(int fd, uint32_t size) |
| 1113 | { |
| 1114 | int ret = 0; |
| 1115 | char *zeros; |
| 1116 | |
| 1117 | if (size == 0) { |
| 1118 | goto end; |
| 1119 | } |
| 1120 | |
| 1121 | zeros = zmalloc(size); |
| 1122 | if (zeros == NULL) { |
| 1123 | PERROR("zmalloc zeros for padding"); |
| 1124 | ret = -1; |
| 1125 | goto end; |
| 1126 | } |
| 1127 | |
| 1128 | do { |
| 1129 | ret = write(fd, zeros, size); |
| 1130 | } while (ret < 0 && errno == EINTR); |
| 1131 | if (ret < 0 || ret != size) { |
| 1132 | PERROR("write padding to file"); |
| 1133 | } |
| 1134 | |
| 1135 | free(zeros); |
| 1136 | |
| 1137 | end: |
| 1138 | return ret; |
| 1139 | } |
| 1140 | |
| 1141 | /* |
| 1142 | * relay_recv_metadata: receive the metada for the session. |
| 1143 | */ |
| 1144 | static |
| 1145 | int relay_recv_metadata(struct lttcomm_relayd_hdr *recv_hdr, |
| 1146 | struct relay_command *cmd, struct lttng_ht *streams_ht) |
| 1147 | { |
| 1148 | int ret = htobe32(LTTNG_OK); |
| 1149 | struct relay_session *session = cmd->session; |
| 1150 | struct lttcomm_relayd_metadata_payload *metadata_struct; |
| 1151 | struct relay_stream *metadata_stream; |
| 1152 | uint64_t data_size, payload_size; |
| 1153 | |
| 1154 | if (!session) { |
| 1155 | ERR("Metadata sent before version check"); |
| 1156 | ret = -1; |
| 1157 | goto end; |
| 1158 | } |
| 1159 | |
| 1160 | data_size = payload_size = be64toh(recv_hdr->data_size); |
| 1161 | if (data_size < sizeof(struct lttcomm_relayd_metadata_payload)) { |
| 1162 | ERR("Incorrect data size"); |
| 1163 | ret = -1; |
| 1164 | goto end; |
| 1165 | } |
| 1166 | payload_size -= sizeof(struct lttcomm_relayd_metadata_payload); |
| 1167 | |
| 1168 | if (data_buffer_size < data_size) { |
| 1169 | /* In case the realloc fails, we can free the memory */ |
| 1170 | char *tmp_data_ptr; |
| 1171 | |
| 1172 | tmp_data_ptr = realloc(data_buffer, data_size); |
| 1173 | if (!tmp_data_ptr) { |
| 1174 | ERR("Allocating data buffer"); |
| 1175 | free(data_buffer); |
| 1176 | ret = -1; |
| 1177 | goto end; |
| 1178 | } |
| 1179 | data_buffer = tmp_data_ptr; |
| 1180 | data_buffer_size = data_size; |
| 1181 | } |
| 1182 | memset(data_buffer, 0, data_size); |
| 1183 | DBG2("Relay receiving metadata, waiting for %" PRIu64 " bytes", data_size); |
| 1184 | ret = cmd->sock->ops->recvmsg(cmd->sock, data_buffer, data_size, 0); |
| 1185 | if (ret < 0 || ret != data_size) { |
| 1186 | if (ret == 0) { |
| 1187 | /* Orderly shutdown. Not necessary to print an error. */ |
| 1188 | DBG("Socket %d did an orderly shutdown", cmd->sock->fd); |
| 1189 | } else { |
| 1190 | ERR("Relay didn't receive the whole metadata"); |
| 1191 | } |
| 1192 | ret = -1; |
| 1193 | goto end; |
| 1194 | } |
| 1195 | metadata_struct = (struct lttcomm_relayd_metadata_payload *) data_buffer; |
| 1196 | |
| 1197 | rcu_read_lock(); |
| 1198 | metadata_stream = relay_stream_from_stream_id( |
| 1199 | be64toh(metadata_struct->stream_id), streams_ht); |
| 1200 | if (!metadata_stream) { |
| 1201 | ret = -1; |
| 1202 | goto end_unlock; |
| 1203 | } |
| 1204 | |
| 1205 | do { |
| 1206 | ret = write(metadata_stream->fd, metadata_struct->payload, |
| 1207 | payload_size); |
| 1208 | } while (ret < 0 && errno == EINTR); |
| 1209 | if (ret < 0 || ret != payload_size) { |
| 1210 | ERR("Relay error writing metadata on file"); |
| 1211 | ret = -1; |
| 1212 | goto end_unlock; |
| 1213 | } |
| 1214 | |
| 1215 | ret = write_padding_to_file(metadata_stream->fd, |
| 1216 | be32toh(metadata_struct->padding_size)); |
| 1217 | if (ret < 0) { |
| 1218 | goto end_unlock; |
| 1219 | } |
| 1220 | |
| 1221 | DBG2("Relay metadata written"); |
| 1222 | |
| 1223 | end_unlock: |
| 1224 | rcu_read_unlock(); |
| 1225 | end: |
| 1226 | return ret; |
| 1227 | } |
| 1228 | |
| 1229 | /* |
| 1230 | * relay_send_version: send relayd version number |
| 1231 | */ |
| 1232 | static |
| 1233 | int relay_send_version(struct lttcomm_relayd_hdr *recv_hdr, |
| 1234 | struct relay_command *cmd) |
| 1235 | { |
| 1236 | int ret; |
| 1237 | struct lttcomm_relayd_version reply, msg; |
| 1238 | |
| 1239 | assert(cmd); |
| 1240 | |
| 1241 | cmd->version_check_done = 1; |
| 1242 | |
| 1243 | /* Get version from the other side. */ |
| 1244 | ret = cmd->sock->ops->recvmsg(cmd->sock, &msg, sizeof(msg), 0); |
| 1245 | if (ret < 0 || ret != sizeof(msg)) { |
| 1246 | if (ret == 0) { |
| 1247 | /* Orderly shutdown. Not necessary to print an error. */ |
| 1248 | DBG("Socket %d did an orderly shutdown", cmd->sock->fd); |
| 1249 | } else { |
| 1250 | ERR("Relay failed to receive the version values."); |
| 1251 | } |
| 1252 | ret = -1; |
| 1253 | goto end; |
| 1254 | } |
| 1255 | |
| 1256 | /* |
| 1257 | * For now, we just ignore the received version but after 2.1 stable |
| 1258 | * release, a check must be done to see if we either adapt to the other |
| 1259 | * side version (which MUST be lower than us) or keep the latest data |
| 1260 | * structure considering that the other side will adapt. |
| 1261 | */ |
| 1262 | |
| 1263 | ret = sscanf(VERSION, "%10u.%10u", &reply.major, &reply.minor); |
| 1264 | if (ret < 2) { |
| 1265 | ERR("Error in scanning version"); |
| 1266 | ret = -1; |
| 1267 | goto end; |
| 1268 | } |
| 1269 | reply.major = htobe32(reply.major); |
| 1270 | reply.minor = htobe32(reply.minor); |
| 1271 | ret = cmd->sock->ops->sendmsg(cmd->sock, &reply, |
| 1272 | sizeof(struct lttcomm_relayd_version), 0); |
| 1273 | if (ret < 0) { |
| 1274 | ERR("Relay sending version"); |
| 1275 | } |
| 1276 | DBG("Version check done (%u.%u)", be32toh(reply.major), |
| 1277 | be32toh(reply.minor)); |
| 1278 | |
| 1279 | end: |
| 1280 | return ret; |
| 1281 | } |
| 1282 | |
| 1283 | /* |
| 1284 | * Check for data pending for a given stream id from the session daemon. |
| 1285 | */ |
| 1286 | static |
| 1287 | int relay_data_pending(struct lttcomm_relayd_hdr *recv_hdr, |
| 1288 | struct relay_command *cmd, struct lttng_ht *streams_ht) |
| 1289 | { |
| 1290 | struct relay_session *session = cmd->session; |
| 1291 | struct lttcomm_relayd_data_pending msg; |
| 1292 | struct lttcomm_relayd_generic_reply reply; |
| 1293 | struct relay_stream *stream; |
| 1294 | int ret; |
| 1295 | uint64_t last_net_seq_num, stream_id; |
| 1296 | |
| 1297 | DBG("Data pending command received"); |
| 1298 | |
| 1299 | if (!session || cmd->version_check_done == 0) { |
| 1300 | ERR("Trying to check for data before version check"); |
| 1301 | ret = -1; |
| 1302 | goto end_no_session; |
| 1303 | } |
| 1304 | |
| 1305 | ret = cmd->sock->ops->recvmsg(cmd->sock, &msg, sizeof(msg), 0); |
| 1306 | if (ret < sizeof(msg)) { |
| 1307 | if (ret == 0) { |
| 1308 | /* Orderly shutdown. Not necessary to print an error. */ |
| 1309 | DBG("Socket %d did an orderly shutdown", cmd->sock->fd); |
| 1310 | } else { |
| 1311 | ERR("Relay didn't receive valid data_pending struct size : %d", |
| 1312 | ret); |
| 1313 | } |
| 1314 | ret = -1; |
| 1315 | goto end_no_session; |
| 1316 | } |
| 1317 | |
| 1318 | stream_id = be64toh(msg.stream_id); |
| 1319 | last_net_seq_num = be64toh(msg.last_net_seq_num); |
| 1320 | |
| 1321 | rcu_read_lock(); |
| 1322 | stream = relay_stream_from_stream_id(stream_id, streams_ht); |
| 1323 | if (stream == NULL) { |
| 1324 | ret = -1; |
| 1325 | goto end_unlock; |
| 1326 | } |
| 1327 | |
| 1328 | DBG("Data pending for stream id %" PRIu64 " prev_seq %" PRIu64 |
| 1329 | " and last_seq %" PRIu64, stream_id, stream->prev_seq, |
| 1330 | last_net_seq_num); |
| 1331 | |
| 1332 | /* Avoid wrapping issue */ |
| 1333 | if (((int64_t) (stream->prev_seq - last_net_seq_num)) >= 0) { |
| 1334 | /* Data has in fact been written and is NOT pending */ |
| 1335 | ret = 0; |
| 1336 | } else { |
| 1337 | /* Data still being streamed thus pending */ |
| 1338 | ret = 1; |
| 1339 | } |
| 1340 | |
| 1341 | /* Pending check is now done. */ |
| 1342 | stream->data_pending_check_done = 1; |
| 1343 | |
| 1344 | end_unlock: |
| 1345 | rcu_read_unlock(); |
| 1346 | |
| 1347 | reply.ret_code = htobe32(ret); |
| 1348 | ret = cmd->sock->ops->sendmsg(cmd->sock, &reply, sizeof(reply), 0); |
| 1349 | if (ret < 0) { |
| 1350 | ERR("Relay data pending ret code failed"); |
| 1351 | } |
| 1352 | |
| 1353 | end_no_session: |
| 1354 | return ret; |
| 1355 | } |
| 1356 | |
| 1357 | /* |
| 1358 | * Wait for the control socket to reach a quiescent state. |
| 1359 | * |
| 1360 | * Note that for now, when receiving this command from the session daemon, this |
| 1361 | * means that every subsequent commands or data received on the control socket |
| 1362 | * has been handled. So, this is why we simply return OK here. |
| 1363 | */ |
| 1364 | static |
| 1365 | int relay_quiescent_control(struct lttcomm_relayd_hdr *recv_hdr, |
| 1366 | struct relay_command *cmd, struct lttng_ht *streams_ht) |
| 1367 | { |
| 1368 | int ret; |
| 1369 | uint64_t stream_id; |
| 1370 | struct relay_stream *stream; |
| 1371 | struct lttng_ht_iter iter; |
| 1372 | struct lttcomm_relayd_quiescent_control msg; |
| 1373 | struct lttcomm_relayd_generic_reply reply; |
| 1374 | |
| 1375 | DBG("Checking quiescent state on control socket"); |
| 1376 | |
| 1377 | if (!cmd->session || cmd->version_check_done == 0) { |
| 1378 | ERR("Trying to check for data before version check"); |
| 1379 | ret = -1; |
| 1380 | goto end_no_session; |
| 1381 | } |
| 1382 | |
| 1383 | ret = cmd->sock->ops->recvmsg(cmd->sock, &msg, sizeof(msg), 0); |
| 1384 | if (ret < sizeof(msg)) { |
| 1385 | if (ret == 0) { |
| 1386 | /* Orderly shutdown. Not necessary to print an error. */ |
| 1387 | DBG("Socket %d did an orderly shutdown", cmd->sock->fd); |
| 1388 | } else { |
| 1389 | ERR("Relay didn't receive valid begin data_pending struct size: %d", |
| 1390 | ret); |
| 1391 | } |
| 1392 | ret = -1; |
| 1393 | goto end_no_session; |
| 1394 | } |
| 1395 | |
| 1396 | stream_id = be64toh(msg.stream_id); |
| 1397 | |
| 1398 | rcu_read_lock(); |
| 1399 | cds_lfht_for_each_entry(streams_ht->ht, &iter.iter, stream, stream_n.node) { |
| 1400 | if (stream->stream_handle == stream_id) { |
| 1401 | stream->data_pending_check_done = 1; |
| 1402 | DBG("Relay quiescent control pending flag set to %" PRIu64, |
| 1403 | stream_id); |
| 1404 | break; |
| 1405 | } |
| 1406 | } |
| 1407 | rcu_read_unlock(); |
| 1408 | |
| 1409 | reply.ret_code = htobe32(LTTNG_OK); |
| 1410 | ret = cmd->sock->ops->sendmsg(cmd->sock, &reply, sizeof(reply), 0); |
| 1411 | if (ret < 0) { |
| 1412 | ERR("Relay data quiescent control ret code failed"); |
| 1413 | } |
| 1414 | |
| 1415 | end_no_session: |
| 1416 | return ret; |
| 1417 | } |
| 1418 | |
| 1419 | /* |
| 1420 | * Initialize a data pending command. This means that a client is about to ask |
| 1421 | * for data pending for each stream he/she holds. Simply iterate over all |
| 1422 | * streams of a session and set the data_pending_check_done flag. |
| 1423 | * |
| 1424 | * This command returns to the client a LTTNG_OK code. |
| 1425 | */ |
| 1426 | static |
| 1427 | int relay_begin_data_pending(struct lttcomm_relayd_hdr *recv_hdr, |
| 1428 | struct relay_command *cmd, struct lttng_ht *streams_ht) |
| 1429 | { |
| 1430 | int ret; |
| 1431 | struct lttng_ht_iter iter; |
| 1432 | struct lttcomm_relayd_begin_data_pending msg; |
| 1433 | struct lttcomm_relayd_generic_reply reply; |
| 1434 | struct relay_stream *stream; |
| 1435 | uint64_t session_id; |
| 1436 | |
| 1437 | assert(recv_hdr); |
| 1438 | assert(cmd); |
| 1439 | assert(streams_ht); |
| 1440 | |
| 1441 | DBG("Init streams for data pending"); |
| 1442 | |
| 1443 | if (!cmd->session || cmd->version_check_done == 0) { |
| 1444 | ERR("Trying to check for data before version check"); |
| 1445 | ret = -1; |
| 1446 | goto end_no_session; |
| 1447 | } |
| 1448 | |
| 1449 | ret = cmd->sock->ops->recvmsg(cmd->sock, &msg, sizeof(msg), 0); |
| 1450 | if (ret < sizeof(msg)) { |
| 1451 | if (ret == 0) { |
| 1452 | /* Orderly shutdown. Not necessary to print an error. */ |
| 1453 | DBG("Socket %d did an orderly shutdown", cmd->sock->fd); |
| 1454 | } else { |
| 1455 | ERR("Relay didn't receive valid begin data_pending struct size: %d", |
| 1456 | ret); |
| 1457 | } |
| 1458 | ret = -1; |
| 1459 | goto end_no_session; |
| 1460 | } |
| 1461 | |
| 1462 | session_id = be64toh(msg.session_id); |
| 1463 | |
| 1464 | /* |
| 1465 | * Iterate over all streams to set the begin data pending flag. For now, the |
| 1466 | * streams are indexed by stream handle so we have to iterate over all |
| 1467 | * streams to find the one associated with the right session_id. |
| 1468 | */ |
| 1469 | rcu_read_lock(); |
| 1470 | cds_lfht_for_each_entry(streams_ht->ht, &iter.iter, stream, stream_n.node) { |
| 1471 | if (stream->session->id == session_id) { |
| 1472 | stream->data_pending_check_done = 0; |
| 1473 | DBG("Set begin data pending flag to stream %" PRIu64, |
| 1474 | stream->stream_handle); |
| 1475 | } |
| 1476 | } |
| 1477 | rcu_read_unlock(); |
| 1478 | |
| 1479 | /* All good, send back reply. */ |
| 1480 | reply.ret_code = htobe32(LTTNG_OK); |
| 1481 | |
| 1482 | ret = cmd->sock->ops->sendmsg(cmd->sock, &reply, sizeof(reply), 0); |
| 1483 | if (ret < 0) { |
| 1484 | ERR("Relay begin data pending send reply failed"); |
| 1485 | } |
| 1486 | |
| 1487 | end_no_session: |
| 1488 | return ret; |
| 1489 | } |
| 1490 | |
| 1491 | /* |
| 1492 | * End data pending command. This will check, for a given session id, if each |
| 1493 | * stream associated with it has its data_pending_check_done flag set. If not, |
| 1494 | * this means that the client lost track of the stream but the data is still |
| 1495 | * being streamed on our side. In this case, we inform the client that data is |
| 1496 | * inflight. |
| 1497 | * |
| 1498 | * Return to the client if there is data in flight or not with a ret_code. |
| 1499 | */ |
| 1500 | static |
| 1501 | int relay_end_data_pending(struct lttcomm_relayd_hdr *recv_hdr, |
| 1502 | struct relay_command *cmd, struct lttng_ht *streams_ht) |
| 1503 | { |
| 1504 | int ret; |
| 1505 | struct lttng_ht_iter iter; |
| 1506 | struct lttcomm_relayd_end_data_pending msg; |
| 1507 | struct lttcomm_relayd_generic_reply reply; |
| 1508 | struct relay_stream *stream; |
| 1509 | uint64_t session_id; |
| 1510 | uint32_t is_data_inflight = 0; |
| 1511 | |
| 1512 | assert(recv_hdr); |
| 1513 | assert(cmd); |
| 1514 | assert(streams_ht); |
| 1515 | |
| 1516 | DBG("End data pending command"); |
| 1517 | |
| 1518 | if (!cmd->session || cmd->version_check_done == 0) { |
| 1519 | ERR("Trying to check for data before version check"); |
| 1520 | ret = -1; |
| 1521 | goto end_no_session; |
| 1522 | } |
| 1523 | |
| 1524 | ret = cmd->sock->ops->recvmsg(cmd->sock, &msg, sizeof(msg), 0); |
| 1525 | if (ret < sizeof(msg)) { |
| 1526 | if (ret == 0) { |
| 1527 | /* Orderly shutdown. Not necessary to print an error. */ |
| 1528 | DBG("Socket %d did an orderly shutdown", cmd->sock->fd); |
| 1529 | } else { |
| 1530 | ERR("Relay didn't receive valid end data_pending struct size: %d", |
| 1531 | ret); |
| 1532 | } |
| 1533 | ret = -1; |
| 1534 | goto end_no_session; |
| 1535 | } |
| 1536 | |
| 1537 | session_id = be64toh(msg.session_id); |
| 1538 | |
| 1539 | /* Iterate over all streams to see if the begin data pending flag is set. */ |
| 1540 | rcu_read_lock(); |
| 1541 | cds_lfht_for_each_entry(streams_ht->ht, &iter.iter, stream, stream_n.node) { |
| 1542 | if (stream->session->id == session_id && |
| 1543 | !stream->data_pending_check_done) { |
| 1544 | is_data_inflight = 1; |
| 1545 | DBG("Data is still in flight for stream %" PRIu64, |
| 1546 | stream->stream_handle); |
| 1547 | break; |
| 1548 | } |
| 1549 | } |
| 1550 | rcu_read_unlock(); |
| 1551 | |
| 1552 | /* All good, send back reply. */ |
| 1553 | reply.ret_code = htobe32(is_data_inflight); |
| 1554 | |
| 1555 | ret = cmd->sock->ops->sendmsg(cmd->sock, &reply, sizeof(reply), 0); |
| 1556 | if (ret < 0) { |
| 1557 | ERR("Relay end data pending send reply failed"); |
| 1558 | } |
| 1559 | |
| 1560 | end_no_session: |
| 1561 | return ret; |
| 1562 | } |
| 1563 | |
| 1564 | /* |
| 1565 | * relay_process_control: Process the commands received on the control socket |
| 1566 | */ |
| 1567 | static |
| 1568 | int relay_process_control(struct lttcomm_relayd_hdr *recv_hdr, |
| 1569 | struct relay_command *cmd, struct lttng_ht *streams_ht) |
| 1570 | { |
| 1571 | int ret = 0; |
| 1572 | |
| 1573 | switch (be32toh(recv_hdr->cmd)) { |
| 1574 | case RELAYD_CREATE_SESSION: |
| 1575 | ret = relay_create_session(recv_hdr, cmd); |
| 1576 | break; |
| 1577 | case RELAYD_ADD_STREAM: |
| 1578 | ret = relay_add_stream(recv_hdr, cmd, streams_ht); |
| 1579 | break; |
| 1580 | case RELAYD_START_DATA: |
| 1581 | ret = relay_start(recv_hdr, cmd); |
| 1582 | break; |
| 1583 | case RELAYD_SEND_METADATA: |
| 1584 | ret = relay_recv_metadata(recv_hdr, cmd, streams_ht); |
| 1585 | break; |
| 1586 | case RELAYD_VERSION: |
| 1587 | ret = relay_send_version(recv_hdr, cmd); |
| 1588 | break; |
| 1589 | case RELAYD_CLOSE_STREAM: |
| 1590 | ret = relay_close_stream(recv_hdr, cmd, streams_ht); |
| 1591 | break; |
| 1592 | case RELAYD_DATA_PENDING: |
| 1593 | ret = relay_data_pending(recv_hdr, cmd, streams_ht); |
| 1594 | break; |
| 1595 | case RELAYD_QUIESCENT_CONTROL: |
| 1596 | ret = relay_quiescent_control(recv_hdr, cmd, streams_ht); |
| 1597 | break; |
| 1598 | case RELAYD_BEGIN_DATA_PENDING: |
| 1599 | ret = relay_begin_data_pending(recv_hdr, cmd, streams_ht); |
| 1600 | break; |
| 1601 | case RELAYD_END_DATA_PENDING: |
| 1602 | ret = relay_end_data_pending(recv_hdr, cmd, streams_ht); |
| 1603 | break; |
| 1604 | case RELAYD_UPDATE_SYNC_INFO: |
| 1605 | default: |
| 1606 | ERR("Received unknown command (%u)", be32toh(recv_hdr->cmd)); |
| 1607 | relay_unknown_command(cmd); |
| 1608 | ret = -1; |
| 1609 | goto end; |
| 1610 | } |
| 1611 | |
| 1612 | end: |
| 1613 | return ret; |
| 1614 | } |
| 1615 | |
| 1616 | /* |
| 1617 | * relay_process_data: Process the data received on the data socket |
| 1618 | */ |
| 1619 | static |
| 1620 | int relay_process_data(struct relay_command *cmd, struct lttng_ht *streams_ht) |
| 1621 | { |
| 1622 | int ret = 0; |
| 1623 | struct relay_stream *stream; |
| 1624 | struct lttcomm_relayd_data_hdr data_hdr; |
| 1625 | uint64_t stream_id; |
| 1626 | uint64_t net_seq_num; |
| 1627 | uint32_t data_size; |
| 1628 | |
| 1629 | ret = cmd->sock->ops->recvmsg(cmd->sock, &data_hdr, |
| 1630 | sizeof(struct lttcomm_relayd_data_hdr), 0); |
| 1631 | if (ret <= 0) { |
| 1632 | if (ret == 0) { |
| 1633 | /* Orderly shutdown. Not necessary to print an error. */ |
| 1634 | DBG("Socket %d did an orderly shutdown", cmd->sock->fd); |
| 1635 | } else { |
| 1636 | ERR("Unable to receive data header on sock %d", cmd->sock->fd); |
| 1637 | } |
| 1638 | ret = -1; |
| 1639 | goto end; |
| 1640 | } |
| 1641 | |
| 1642 | stream_id = be64toh(data_hdr.stream_id); |
| 1643 | |
| 1644 | rcu_read_lock(); |
| 1645 | stream = relay_stream_from_stream_id(stream_id, streams_ht); |
| 1646 | if (!stream) { |
| 1647 | ret = -1; |
| 1648 | goto end_unlock; |
| 1649 | } |
| 1650 | |
| 1651 | data_size = be32toh(data_hdr.data_size); |
| 1652 | if (data_buffer_size < data_size) { |
| 1653 | char *tmp_data_ptr; |
| 1654 | |
| 1655 | tmp_data_ptr = realloc(data_buffer, data_size); |
| 1656 | if (!tmp_data_ptr) { |
| 1657 | ERR("Allocating data buffer"); |
| 1658 | free(data_buffer); |
| 1659 | ret = -1; |
| 1660 | goto end_unlock; |
| 1661 | } |
| 1662 | data_buffer = tmp_data_ptr; |
| 1663 | data_buffer_size = data_size; |
| 1664 | } |
| 1665 | memset(data_buffer, 0, data_size); |
| 1666 | |
| 1667 | net_seq_num = be64toh(data_hdr.net_seq_num); |
| 1668 | |
| 1669 | DBG3("Receiving data of size %u for stream id %" PRIu64 " seqnum %" PRIu64, |
| 1670 | data_size, stream_id, net_seq_num); |
| 1671 | ret = cmd->sock->ops->recvmsg(cmd->sock, data_buffer, data_size, 0); |
| 1672 | if (ret <= 0) { |
| 1673 | if (ret == 0) { |
| 1674 | /* Orderly shutdown. Not necessary to print an error. */ |
| 1675 | DBG("Socket %d did an orderly shutdown", cmd->sock->fd); |
| 1676 | } |
| 1677 | ret = -1; |
| 1678 | goto end_unlock; |
| 1679 | } |
| 1680 | |
| 1681 | do { |
| 1682 | ret = write(stream->fd, data_buffer, data_size); |
| 1683 | } while (ret < 0 && errno == EINTR); |
| 1684 | if (ret < 0 || ret != data_size) { |
| 1685 | ERR("Relay error writing data to file"); |
| 1686 | ret = -1; |
| 1687 | goto end_unlock; |
| 1688 | } |
| 1689 | |
| 1690 | DBG2("Relay wrote %d bytes to tracefile for stream id %" PRIu64, |
| 1691 | ret, stream->stream_handle); |
| 1692 | |
| 1693 | ret = write_padding_to_file(stream->fd, be32toh(data_hdr.padding_size)); |
| 1694 | if (ret < 0) { |
| 1695 | goto end_unlock; |
| 1696 | } |
| 1697 | |
| 1698 | stream->prev_seq = net_seq_num; |
| 1699 | |
| 1700 | /* Check if we need to close the FD */ |
| 1701 | if (close_stream_check(stream)) { |
| 1702 | int cret; |
| 1703 | struct lttng_ht_iter iter; |
| 1704 | |
| 1705 | cret = close(stream->fd); |
| 1706 | if (cret < 0) { |
| 1707 | PERROR("close stream process data"); |
| 1708 | } |
| 1709 | iter.iter.node = &stream->stream_n.node; |
| 1710 | ret = lttng_ht_del(streams_ht, &iter); |
| 1711 | assert(!ret); |
| 1712 | call_rcu(&stream->rcu_node, |
| 1713 | deferred_free_stream); |
| 1714 | DBG("Closed tracefile %d after recv data", stream->fd); |
| 1715 | } |
| 1716 | |
| 1717 | end_unlock: |
| 1718 | rcu_read_unlock(); |
| 1719 | end: |
| 1720 | return ret; |
| 1721 | } |
| 1722 | |
| 1723 | static |
| 1724 | void relay_cleanup_poll_connection(struct lttng_poll_event *events, int pollfd) |
| 1725 | { |
| 1726 | int ret; |
| 1727 | |
| 1728 | lttng_poll_del(events, pollfd); |
| 1729 | |
| 1730 | ret = close(pollfd); |
| 1731 | if (ret < 0) { |
| 1732 | ERR("Closing pollfd %d", pollfd); |
| 1733 | } |
| 1734 | } |
| 1735 | |
| 1736 | static |
| 1737 | int relay_add_connection(int fd, struct lttng_poll_event *events, |
| 1738 | struct lttng_ht *relay_connections_ht) |
| 1739 | { |
| 1740 | struct relay_command *relay_connection; |
| 1741 | int ret; |
| 1742 | |
| 1743 | relay_connection = zmalloc(sizeof(struct relay_command)); |
| 1744 | if (relay_connection == NULL) { |
| 1745 | PERROR("Relay command zmalloc"); |
| 1746 | goto error; |
| 1747 | } |
| 1748 | do { |
| 1749 | ret = read(fd, relay_connection, sizeof(struct relay_command)); |
| 1750 | } while (ret < 0 && errno == EINTR); |
| 1751 | if (ret < 0 || ret < sizeof(struct relay_command)) { |
| 1752 | PERROR("read relay cmd pipe"); |
| 1753 | goto error_read; |
| 1754 | } |
| 1755 | |
| 1756 | lttng_ht_node_init_ulong(&relay_connection->sock_n, |
| 1757 | (unsigned long) relay_connection->sock->fd); |
| 1758 | rcu_read_lock(); |
| 1759 | lttng_ht_add_unique_ulong(relay_connections_ht, |
| 1760 | &relay_connection->sock_n); |
| 1761 | rcu_read_unlock(); |
| 1762 | return lttng_poll_add(events, |
| 1763 | relay_connection->sock->fd, |
| 1764 | LPOLLIN | LPOLLRDHUP); |
| 1765 | |
| 1766 | error_read: |
| 1767 | free(relay_connection); |
| 1768 | error: |
| 1769 | return -1; |
| 1770 | } |
| 1771 | |
| 1772 | static |
| 1773 | void deferred_free_connection(struct rcu_head *head) |
| 1774 | { |
| 1775 | struct relay_command *relay_connection = |
| 1776 | caa_container_of(head, struct relay_command, rcu_node); |
| 1777 | |
| 1778 | lttcomm_destroy_sock(relay_connection->sock); |
| 1779 | free(relay_connection); |
| 1780 | } |
| 1781 | |
| 1782 | static |
| 1783 | void relay_del_connection(struct lttng_ht *relay_connections_ht, |
| 1784 | struct lttng_ht *streams_ht, struct lttng_ht_iter *iter, |
| 1785 | struct relay_command *relay_connection) |
| 1786 | { |
| 1787 | int ret; |
| 1788 | |
| 1789 | ret = lttng_ht_del(relay_connections_ht, iter); |
| 1790 | assert(!ret); |
| 1791 | if (relay_connection->type == RELAY_CONTROL) { |
| 1792 | relay_delete_session(relay_connection, streams_ht); |
| 1793 | } |
| 1794 | |
| 1795 | call_rcu(&relay_connection->rcu_node, |
| 1796 | deferred_free_connection); |
| 1797 | } |
| 1798 | |
| 1799 | /* |
| 1800 | * This thread does the actual work |
| 1801 | */ |
| 1802 | static |
| 1803 | void *relay_thread_worker(void *data) |
| 1804 | { |
| 1805 | int ret, err = -1, last_seen_data_fd = -1; |
| 1806 | uint32_t nb_fd; |
| 1807 | struct relay_command *relay_connection; |
| 1808 | struct lttng_poll_event events; |
| 1809 | struct lttng_ht *relay_connections_ht; |
| 1810 | struct lttng_ht_node_ulong *node; |
| 1811 | struct lttng_ht_iter iter; |
| 1812 | struct lttng_ht *streams_ht; |
| 1813 | struct lttcomm_relayd_hdr recv_hdr; |
| 1814 | |
| 1815 | DBG("[thread] Relay worker started"); |
| 1816 | |
| 1817 | rcu_register_thread(); |
| 1818 | |
| 1819 | /* table of connections indexed on socket */ |
| 1820 | relay_connections_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
| 1821 | if (!relay_connections_ht) { |
| 1822 | goto relay_connections_ht_error; |
| 1823 | } |
| 1824 | |
| 1825 | /* tables of streams indexed by stream ID */ |
| 1826 | streams_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
| 1827 | if (!streams_ht) { |
| 1828 | goto streams_ht_error; |
| 1829 | } |
| 1830 | |
| 1831 | ret = create_thread_poll_set(&events, 2); |
| 1832 | if (ret < 0) { |
| 1833 | goto error_poll_create; |
| 1834 | } |
| 1835 | |
| 1836 | ret = lttng_poll_add(&events, relay_cmd_pipe[0], LPOLLIN | LPOLLRDHUP); |
| 1837 | if (ret < 0) { |
| 1838 | goto error; |
| 1839 | } |
| 1840 | |
| 1841 | restart: |
| 1842 | while (1) { |
| 1843 | int idx = -1, i, seen_control = 0, last_notdel_data_fd = -1; |
| 1844 | |
| 1845 | /* Infinite blocking call, waiting for transmission */ |
| 1846 | DBG3("Relayd worker thread polling..."); |
| 1847 | ret = lttng_poll_wait(&events, -1); |
| 1848 | if (ret < 0) { |
| 1849 | /* |
| 1850 | * Restart interrupted system call. |
| 1851 | */ |
| 1852 | if (errno == EINTR) { |
| 1853 | goto restart; |
| 1854 | } |
| 1855 | goto error; |
| 1856 | } |
| 1857 | |
| 1858 | nb_fd = ret; |
| 1859 | |
| 1860 | /* |
| 1861 | * Process control. The control connection is prioritised so we don't |
| 1862 | * starve it with high throughout put tracing data on the data |
| 1863 | * connection. |
| 1864 | */ |
| 1865 | for (i = 0; i < nb_fd; i++) { |
| 1866 | /* Fetch once the poll data */ |
| 1867 | uint32_t revents = LTTNG_POLL_GETEV(&events, i); |
| 1868 | int pollfd = LTTNG_POLL_GETFD(&events, i); |
| 1869 | |
| 1870 | /* Thread quit pipe has been closed. Killing thread. */ |
| 1871 | ret = check_thread_quit_pipe(pollfd, revents); |
| 1872 | if (ret) { |
| 1873 | err = 0; |
| 1874 | goto exit; |
| 1875 | } |
| 1876 | |
| 1877 | /* Inspect the relay cmd pipe for new connection */ |
| 1878 | if (pollfd == relay_cmd_pipe[0]) { |
| 1879 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { |
| 1880 | ERR("Relay pipe error"); |
| 1881 | goto error; |
| 1882 | } else if (revents & LPOLLIN) { |
| 1883 | DBG("Relay command received"); |
| 1884 | ret = relay_add_connection(relay_cmd_pipe[0], |
| 1885 | &events, relay_connections_ht); |
| 1886 | if (ret < 0) { |
| 1887 | goto error; |
| 1888 | } |
| 1889 | } |
| 1890 | } else if (revents) { |
| 1891 | rcu_read_lock(); |
| 1892 | lttng_ht_lookup(relay_connections_ht, |
| 1893 | (void *)((unsigned long) pollfd), |
| 1894 | &iter); |
| 1895 | node = lttng_ht_iter_get_node_ulong(&iter); |
| 1896 | if (node == NULL) { |
| 1897 | DBG2("Relay sock %d not found", pollfd); |
| 1898 | rcu_read_unlock(); |
| 1899 | goto error; |
| 1900 | } |
| 1901 | relay_connection = caa_container_of(node, |
| 1902 | struct relay_command, sock_n); |
| 1903 | |
| 1904 | if (revents & (LPOLLERR)) { |
| 1905 | ERR("POLL ERROR"); |
| 1906 | relay_cleanup_poll_connection(&events, pollfd); |
| 1907 | relay_del_connection(relay_connections_ht, |
| 1908 | streams_ht, &iter, |
| 1909 | relay_connection); |
| 1910 | if (last_seen_data_fd == pollfd) { |
| 1911 | last_seen_data_fd = last_notdel_data_fd; |
| 1912 | } |
| 1913 | } else if (revents & (LPOLLHUP | LPOLLRDHUP)) { |
| 1914 | DBG("Socket %d hung up", pollfd); |
| 1915 | relay_cleanup_poll_connection(&events, pollfd); |
| 1916 | relay_del_connection(relay_connections_ht, |
| 1917 | streams_ht, &iter, |
| 1918 | relay_connection); |
| 1919 | if (last_seen_data_fd == pollfd) { |
| 1920 | last_seen_data_fd = last_notdel_data_fd; |
| 1921 | } |
| 1922 | } else if (revents & LPOLLIN) { |
| 1923 | /* control socket */ |
| 1924 | if (relay_connection->type == RELAY_CONTROL) { |
| 1925 | ret = relay_connection->sock->ops->recvmsg( |
| 1926 | relay_connection->sock, &recv_hdr, |
| 1927 | sizeof(struct lttcomm_relayd_hdr), 0); |
| 1928 | /* connection closed */ |
| 1929 | if (ret <= 0) { |
| 1930 | relay_cleanup_poll_connection(&events, pollfd); |
| 1931 | relay_del_connection(relay_connections_ht, |
| 1932 | streams_ht, &iter, |
| 1933 | relay_connection); |
| 1934 | DBG("Control connection closed with %d", pollfd); |
| 1935 | } else { |
| 1936 | if (relay_connection->session) { |
| 1937 | DBG2("Relay worker receiving data for session : %" PRIu64, |
| 1938 | relay_connection->session->id); |
| 1939 | } |
| 1940 | ret = relay_process_control(&recv_hdr, |
| 1941 | relay_connection, |
| 1942 | streams_ht); |
| 1943 | if (ret < 0) { |
| 1944 | /* Clear the session on error. */ |
| 1945 | relay_cleanup_poll_connection(&events, pollfd); |
| 1946 | relay_del_connection(relay_connections_ht, |
| 1947 | streams_ht, &iter, |
| 1948 | relay_connection); |
| 1949 | DBG("Connection closed with %d", pollfd); |
| 1950 | } |
| 1951 | seen_control = 1; |
| 1952 | } |
| 1953 | } else { |
| 1954 | /* |
| 1955 | * Flag the last seen data fd not deleted. It will be |
| 1956 | * used as the last seen fd if any fd gets deleted in |
| 1957 | * this first loop. |
| 1958 | */ |
| 1959 | last_notdel_data_fd = pollfd; |
| 1960 | } |
| 1961 | } |
| 1962 | rcu_read_unlock(); |
| 1963 | } |
| 1964 | } |
| 1965 | |
| 1966 | /* |
| 1967 | * The last loop handled a control request, go back to poll to make |
| 1968 | * sure we prioritise the control socket. |
| 1969 | */ |
| 1970 | if (seen_control) { |
| 1971 | continue; |
| 1972 | } |
| 1973 | |
| 1974 | if (last_seen_data_fd >= 0) { |
| 1975 | for (i = 0; i < nb_fd; i++) { |
| 1976 | int pollfd = LTTNG_POLL_GETFD(&events, i); |
| 1977 | if (last_seen_data_fd == pollfd) { |
| 1978 | idx = i; |
| 1979 | break; |
| 1980 | } |
| 1981 | } |
| 1982 | } |
| 1983 | |
| 1984 | /* Process data connection. */ |
| 1985 | for (i = idx + 1; i < nb_fd; i++) { |
| 1986 | /* Fetch the poll data. */ |
| 1987 | uint32_t revents = LTTNG_POLL_GETEV(&events, i); |
| 1988 | int pollfd = LTTNG_POLL_GETFD(&events, i); |
| 1989 | |
| 1990 | /* Skip the command pipe. It's handled in the first loop. */ |
| 1991 | if (pollfd == relay_cmd_pipe[0]) { |
| 1992 | continue; |
| 1993 | } |
| 1994 | |
| 1995 | if (revents) { |
| 1996 | rcu_read_lock(); |
| 1997 | lttng_ht_lookup(relay_connections_ht, |
| 1998 | (void *)((unsigned long) pollfd), |
| 1999 | &iter); |
| 2000 | node = lttng_ht_iter_get_node_ulong(&iter); |
| 2001 | if (node == NULL) { |
| 2002 | /* Skip it. Might be removed before. */ |
| 2003 | rcu_read_unlock(); |
| 2004 | continue; |
| 2005 | } |
| 2006 | relay_connection = caa_container_of(node, |
| 2007 | struct relay_command, sock_n); |
| 2008 | |
| 2009 | if (revents & LPOLLIN) { |
| 2010 | if (relay_connection->type != RELAY_DATA) { |
| 2011 | continue; |
| 2012 | } |
| 2013 | |
| 2014 | ret = relay_process_data(relay_connection, streams_ht); |
| 2015 | /* connection closed */ |
| 2016 | if (ret < 0) { |
| 2017 | relay_cleanup_poll_connection(&events, pollfd); |
| 2018 | relay_del_connection(relay_connections_ht, |
| 2019 | streams_ht, &iter, |
| 2020 | relay_connection); |
| 2021 | DBG("Data connection closed with %d", pollfd); |
| 2022 | /* |
| 2023 | * Every goto restart call sets the last seen fd where |
| 2024 | * here we don't really care since we gracefully |
| 2025 | * continue the loop after the connection is deleted. |
| 2026 | */ |
| 2027 | } else { |
| 2028 | /* Keep last seen port. */ |
| 2029 | last_seen_data_fd = pollfd; |
| 2030 | rcu_read_unlock(); |
| 2031 | goto restart; |
| 2032 | } |
| 2033 | } |
| 2034 | rcu_read_unlock(); |
| 2035 | } |
| 2036 | } |
| 2037 | last_seen_data_fd = -1; |
| 2038 | } |
| 2039 | |
| 2040 | exit: |
| 2041 | error: |
| 2042 | lttng_poll_clean(&events); |
| 2043 | |
| 2044 | /* empty the hash table and free the memory */ |
| 2045 | rcu_read_lock(); |
| 2046 | cds_lfht_for_each_entry(relay_connections_ht->ht, &iter.iter, node, node) { |
| 2047 | node = lttng_ht_iter_get_node_ulong(&iter); |
| 2048 | if (node) { |
| 2049 | relay_connection = caa_container_of(node, |
| 2050 | struct relay_command, sock_n); |
| 2051 | relay_del_connection(relay_connections_ht, |
| 2052 | streams_ht, &iter, |
| 2053 | relay_connection); |
| 2054 | } |
| 2055 | } |
| 2056 | rcu_read_unlock(); |
| 2057 | error_poll_create: |
| 2058 | lttng_ht_destroy(streams_ht); |
| 2059 | streams_ht_error: |
| 2060 | lttng_ht_destroy(relay_connections_ht); |
| 2061 | relay_connections_ht_error: |
| 2062 | /* Close relay cmd pipes */ |
| 2063 | utils_close_pipe(relay_cmd_pipe); |
| 2064 | if (err) { |
| 2065 | DBG("Thread exited with error"); |
| 2066 | } |
| 2067 | DBG("Worker thread cleanup complete"); |
| 2068 | free(data_buffer); |
| 2069 | stop_threads(); |
| 2070 | rcu_unregister_thread(); |
| 2071 | return NULL; |
| 2072 | } |
| 2073 | |
| 2074 | /* |
| 2075 | * Create the relay command pipe to wake thread_manage_apps. |
| 2076 | * Closed in cleanup(). |
| 2077 | */ |
| 2078 | static int create_relay_cmd_pipe(void) |
| 2079 | { |
| 2080 | int ret; |
| 2081 | |
| 2082 | ret = utils_create_pipe_cloexec(relay_cmd_pipe); |
| 2083 | |
| 2084 | return ret; |
| 2085 | } |
| 2086 | |
| 2087 | /* |
| 2088 | * main |
| 2089 | */ |
| 2090 | int main(int argc, char **argv) |
| 2091 | { |
| 2092 | int ret = 0; |
| 2093 | void *status; |
| 2094 | |
| 2095 | /* Create thread quit pipe */ |
| 2096 | if ((ret = init_thread_quit_pipe()) < 0) { |
| 2097 | goto error; |
| 2098 | } |
| 2099 | |
| 2100 | /* Parse arguments */ |
| 2101 | progname = argv[0]; |
| 2102 | if ((ret = parse_args(argc, argv)) < 0) { |
| 2103 | goto exit; |
| 2104 | } |
| 2105 | |
| 2106 | if ((ret = set_signal_handler()) < 0) { |
| 2107 | goto exit; |
| 2108 | } |
| 2109 | |
| 2110 | /* Try to create directory if -o, --output is specified. */ |
| 2111 | if (opt_output_path) { |
| 2112 | ret = utils_mkdir_recursive(opt_output_path, S_IRWXU | S_IRWXG); |
| 2113 | if (ret < 0) { |
| 2114 | ERR("Unable to create %s", opt_output_path); |
| 2115 | goto exit; |
| 2116 | } |
| 2117 | } |
| 2118 | |
| 2119 | /* Daemonize */ |
| 2120 | if (opt_daemon) { |
| 2121 | ret = daemon(0, 0); |
| 2122 | if (ret < 0) { |
| 2123 | PERROR("daemon"); |
| 2124 | goto exit; |
| 2125 | } |
| 2126 | } |
| 2127 | |
| 2128 | /* Check if daemon is UID = 0 */ |
| 2129 | is_root = !getuid(); |
| 2130 | |
| 2131 | if (!is_root) { |
| 2132 | if (control_uri->port < 1024 || data_uri->port < 1024) { |
| 2133 | ERR("Need to be root to use ports < 1024"); |
| 2134 | ret = -1; |
| 2135 | goto exit; |
| 2136 | } |
| 2137 | } |
| 2138 | |
| 2139 | /* Setup the thread apps communication pipe. */ |
| 2140 | if ((ret = create_relay_cmd_pipe()) < 0) { |
| 2141 | goto exit; |
| 2142 | } |
| 2143 | |
| 2144 | /* Init relay command queue. */ |
| 2145 | cds_wfq_init(&relay_cmd_queue.queue); |
| 2146 | |
| 2147 | /* Set up max poll set size */ |
| 2148 | lttng_poll_set_max_size(); |
| 2149 | |
| 2150 | /* Setup the dispatcher thread */ |
| 2151 | ret = pthread_create(&dispatcher_thread, NULL, |
| 2152 | relay_thread_dispatcher, (void *) NULL); |
| 2153 | if (ret != 0) { |
| 2154 | PERROR("pthread_create dispatcher"); |
| 2155 | goto exit_dispatcher; |
| 2156 | } |
| 2157 | |
| 2158 | /* Setup the worker thread */ |
| 2159 | ret = pthread_create(&worker_thread, NULL, |
| 2160 | relay_thread_worker, (void *) NULL); |
| 2161 | if (ret != 0) { |
| 2162 | PERROR("pthread_create worker"); |
| 2163 | goto exit_worker; |
| 2164 | } |
| 2165 | |
| 2166 | /* Setup the listener thread */ |
| 2167 | ret = pthread_create(&listener_thread, NULL, |
| 2168 | relay_thread_listener, (void *) NULL); |
| 2169 | if (ret != 0) { |
| 2170 | PERROR("pthread_create listener"); |
| 2171 | goto exit_listener; |
| 2172 | } |
| 2173 | |
| 2174 | exit_listener: |
| 2175 | ret = pthread_join(listener_thread, &status); |
| 2176 | if (ret != 0) { |
| 2177 | PERROR("pthread_join"); |
| 2178 | goto error; /* join error, exit without cleanup */ |
| 2179 | } |
| 2180 | |
| 2181 | exit_worker: |
| 2182 | ret = pthread_join(worker_thread, &status); |
| 2183 | if (ret != 0) { |
| 2184 | PERROR("pthread_join"); |
| 2185 | goto error; /* join error, exit without cleanup */ |
| 2186 | } |
| 2187 | |
| 2188 | exit_dispatcher: |
| 2189 | ret = pthread_join(dispatcher_thread, &status); |
| 2190 | if (ret != 0) { |
| 2191 | PERROR("pthread_join"); |
| 2192 | goto error; /* join error, exit without cleanup */ |
| 2193 | } |
| 2194 | |
| 2195 | exit: |
| 2196 | cleanup(); |
| 2197 | if (!ret) { |
| 2198 | exit(EXIT_SUCCESS); |
| 2199 | } |
| 2200 | |
| 2201 | error: |
| 2202 | exit(EXIT_FAILURE); |
| 2203 | } |