| 1 | /* |
| 2 | * Copyright (C) 2013 - 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 "live.h" |
| 56 | #include "lttng-relayd.h" |
| 57 | #include "lttng-viewer.h" |
| 58 | #include "utils.h" |
| 59 | #include "health-relayd.h" |
| 60 | #include "testpoint.h" |
| 61 | |
| 62 | static struct lttng_uri *live_uri; |
| 63 | |
| 64 | /* |
| 65 | * This pipe is used to inform the worker thread that a command is queued and |
| 66 | * ready to be processed. |
| 67 | */ |
| 68 | static int live_relay_cmd_pipe[2] = { -1, -1 }; |
| 69 | |
| 70 | /* Shared between threads */ |
| 71 | static int live_dispatch_thread_exit; |
| 72 | |
| 73 | static pthread_t live_listener_thread; |
| 74 | static pthread_t live_dispatcher_thread; |
| 75 | static pthread_t live_worker_thread; |
| 76 | |
| 77 | /* |
| 78 | * Relay command queue. |
| 79 | * |
| 80 | * The live_thread_listener and live_thread_dispatcher communicate with this |
| 81 | * queue. |
| 82 | */ |
| 83 | static struct relay_cmd_queue viewer_cmd_queue; |
| 84 | |
| 85 | static uint64_t last_relay_viewer_session_id; |
| 86 | |
| 87 | /* |
| 88 | * Cleanup the daemon |
| 89 | */ |
| 90 | static |
| 91 | void cleanup(void) |
| 92 | { |
| 93 | DBG("Cleaning up"); |
| 94 | |
| 95 | free(live_uri); |
| 96 | } |
| 97 | |
| 98 | /* |
| 99 | * Write to writable pipe used to notify a thread. |
| 100 | */ |
| 101 | static |
| 102 | int notify_thread_pipe(int wpipe) |
| 103 | { |
| 104 | ssize_t ret; |
| 105 | |
| 106 | ret = lttng_write(wpipe, "!", 1); |
| 107 | if (ret < 1) { |
| 108 | PERROR("write poll pipe"); |
| 109 | } |
| 110 | |
| 111 | return (int) ret; |
| 112 | } |
| 113 | |
| 114 | /* |
| 115 | * Stop all threads by closing the thread quit pipe. |
| 116 | */ |
| 117 | static |
| 118 | void stop_threads(void) |
| 119 | { |
| 120 | int ret; |
| 121 | |
| 122 | /* Stopping all threads */ |
| 123 | DBG("Terminating all live threads"); |
| 124 | ret = notify_thread_pipe(thread_quit_pipe[1]); |
| 125 | if (ret < 0) { |
| 126 | ERR("write error on thread quit pipe"); |
| 127 | } |
| 128 | |
| 129 | /* Dispatch thread */ |
| 130 | CMM_STORE_SHARED(live_dispatch_thread_exit, 1); |
| 131 | futex_nto1_wake(&viewer_cmd_queue.futex); |
| 132 | } |
| 133 | |
| 134 | /* |
| 135 | * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set. |
| 136 | */ |
| 137 | static |
| 138 | int create_thread_poll_set(struct lttng_poll_event *events, int size) |
| 139 | { |
| 140 | int ret; |
| 141 | |
| 142 | if (events == NULL || size == 0) { |
| 143 | ret = -1; |
| 144 | goto error; |
| 145 | } |
| 146 | |
| 147 | ret = lttng_poll_create(events, size, LTTNG_CLOEXEC); |
| 148 | if (ret < 0) { |
| 149 | goto error; |
| 150 | } |
| 151 | |
| 152 | /* Add quit pipe */ |
| 153 | ret = lttng_poll_add(events, thread_quit_pipe[0], LPOLLIN | LPOLLERR); |
| 154 | if (ret < 0) { |
| 155 | goto error; |
| 156 | } |
| 157 | |
| 158 | return 0; |
| 159 | |
| 160 | error: |
| 161 | return ret; |
| 162 | } |
| 163 | |
| 164 | /* |
| 165 | * Check if the thread quit pipe was triggered. |
| 166 | * |
| 167 | * Return 1 if it was triggered else 0; |
| 168 | */ |
| 169 | static |
| 170 | int check_thread_quit_pipe(int fd, uint32_t events) |
| 171 | { |
| 172 | if (fd == thread_quit_pipe[0] && (events & LPOLLIN)) { |
| 173 | return 1; |
| 174 | } |
| 175 | |
| 176 | return 0; |
| 177 | } |
| 178 | |
| 179 | /* |
| 180 | * Create and init socket from uri. |
| 181 | */ |
| 182 | static |
| 183 | struct lttcomm_sock *init_socket(struct lttng_uri *uri) |
| 184 | { |
| 185 | int ret; |
| 186 | struct lttcomm_sock *sock = NULL; |
| 187 | |
| 188 | sock = lttcomm_alloc_sock_from_uri(uri); |
| 189 | if (sock == NULL) { |
| 190 | ERR("Allocating socket"); |
| 191 | goto error; |
| 192 | } |
| 193 | |
| 194 | ret = lttcomm_create_sock(sock); |
| 195 | if (ret < 0) { |
| 196 | goto error; |
| 197 | } |
| 198 | DBG("Listening on sock %d for live", sock->fd); |
| 199 | |
| 200 | ret = sock->ops->bind(sock); |
| 201 | if (ret < 0) { |
| 202 | goto error; |
| 203 | } |
| 204 | |
| 205 | ret = sock->ops->listen(sock, -1); |
| 206 | if (ret < 0) { |
| 207 | goto error; |
| 208 | |
| 209 | } |
| 210 | |
| 211 | return sock; |
| 212 | |
| 213 | error: |
| 214 | if (sock) { |
| 215 | lttcomm_destroy_sock(sock); |
| 216 | } |
| 217 | return NULL; |
| 218 | } |
| 219 | |
| 220 | /* |
| 221 | * This thread manages the listening for new connections on the network |
| 222 | */ |
| 223 | static |
| 224 | void *thread_listener(void *data) |
| 225 | { |
| 226 | int i, ret, pollfd, err = -1; |
| 227 | int val = 1; |
| 228 | uint32_t revents, nb_fd; |
| 229 | struct lttng_poll_event events; |
| 230 | struct lttcomm_sock *live_control_sock; |
| 231 | |
| 232 | DBG("[thread] Relay live listener started"); |
| 233 | |
| 234 | health_register(health_relayd, HEALTH_RELAYD_TYPE_LIVE_LISTENER); |
| 235 | |
| 236 | health_code_update(); |
| 237 | |
| 238 | live_control_sock = init_socket(live_uri); |
| 239 | if (!live_control_sock) { |
| 240 | goto error_sock_control; |
| 241 | } |
| 242 | |
| 243 | /* Pass 2 as size here for the thread quit pipe and control sockets. */ |
| 244 | ret = create_thread_poll_set(&events, 2); |
| 245 | if (ret < 0) { |
| 246 | goto error_create_poll; |
| 247 | } |
| 248 | |
| 249 | /* Add the control socket */ |
| 250 | ret = lttng_poll_add(&events, live_control_sock->fd, LPOLLIN | LPOLLRDHUP); |
| 251 | if (ret < 0) { |
| 252 | goto error_poll_add; |
| 253 | } |
| 254 | |
| 255 | lttng_relay_notify_ready(); |
| 256 | |
| 257 | if (testpoint(relayd_thread_live_listener)) { |
| 258 | goto error_testpoint; |
| 259 | } |
| 260 | |
| 261 | while (1) { |
| 262 | health_code_update(); |
| 263 | |
| 264 | DBG("Listener accepting live viewers connections"); |
| 265 | |
| 266 | restart: |
| 267 | health_poll_entry(); |
| 268 | ret = lttng_poll_wait(&events, -1); |
| 269 | health_poll_exit(); |
| 270 | if (ret < 0) { |
| 271 | /* |
| 272 | * Restart interrupted system call. |
| 273 | */ |
| 274 | if (errno == EINTR) { |
| 275 | goto restart; |
| 276 | } |
| 277 | goto error; |
| 278 | } |
| 279 | nb_fd = ret; |
| 280 | |
| 281 | DBG("Relay new viewer connection received"); |
| 282 | for (i = 0; i < nb_fd; i++) { |
| 283 | health_code_update(); |
| 284 | |
| 285 | /* Fetch once the poll data */ |
| 286 | revents = LTTNG_POLL_GETEV(&events, i); |
| 287 | pollfd = LTTNG_POLL_GETFD(&events, i); |
| 288 | |
| 289 | /* Thread quit pipe has been closed. Killing thread. */ |
| 290 | ret = check_thread_quit_pipe(pollfd, revents); |
| 291 | if (ret) { |
| 292 | err = 0; |
| 293 | goto exit; |
| 294 | } |
| 295 | |
| 296 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { |
| 297 | ERR("socket poll error"); |
| 298 | goto error; |
| 299 | } else if (revents & LPOLLIN) { |
| 300 | /* |
| 301 | * Get allocated in this thread, enqueued to a global queue, |
| 302 | * dequeued and freed in the worker thread. |
| 303 | */ |
| 304 | struct relay_command *relay_cmd; |
| 305 | struct lttcomm_sock *newsock; |
| 306 | |
| 307 | relay_cmd = zmalloc(sizeof(*relay_cmd)); |
| 308 | if (!relay_cmd) { |
| 309 | PERROR("relay command zmalloc"); |
| 310 | goto error; |
| 311 | } |
| 312 | |
| 313 | assert(pollfd == live_control_sock->fd); |
| 314 | newsock = live_control_sock->ops->accept(live_control_sock); |
| 315 | if (!newsock) { |
| 316 | PERROR("accepting control sock"); |
| 317 | free(relay_cmd); |
| 318 | goto error; |
| 319 | } |
| 320 | DBG("Relay viewer connection accepted socket %d", newsock->fd); |
| 321 | ret = setsockopt(newsock->fd, SOL_SOCKET, SO_REUSEADDR, &val, |
| 322 | sizeof(int)); |
| 323 | if (ret < 0) { |
| 324 | PERROR("setsockopt inet"); |
| 325 | lttcomm_destroy_sock(newsock); |
| 326 | free(relay_cmd); |
| 327 | goto error; |
| 328 | } |
| 329 | relay_cmd->sock = newsock; |
| 330 | |
| 331 | /* |
| 332 | * Lock free enqueue the request. |
| 333 | */ |
| 334 | cds_wfq_enqueue(&viewer_cmd_queue.queue, &relay_cmd->node); |
| 335 | |
| 336 | /* |
| 337 | * Wake the dispatch queue futex. Implicit memory |
| 338 | * barrier with the exchange in cds_wfq_enqueue. |
| 339 | */ |
| 340 | futex_nto1_wake(&viewer_cmd_queue.futex); |
| 341 | } |
| 342 | } |
| 343 | } |
| 344 | |
| 345 | exit: |
| 346 | error: |
| 347 | error_poll_add: |
| 348 | error_testpoint: |
| 349 | lttng_poll_clean(&events); |
| 350 | error_create_poll: |
| 351 | if (live_control_sock->fd >= 0) { |
| 352 | ret = live_control_sock->ops->close(live_control_sock); |
| 353 | if (ret) { |
| 354 | PERROR("close"); |
| 355 | } |
| 356 | } |
| 357 | lttcomm_destroy_sock(live_control_sock); |
| 358 | error_sock_control: |
| 359 | if (err) { |
| 360 | health_error(); |
| 361 | DBG("Live viewer listener thread exited with error"); |
| 362 | } |
| 363 | health_unregister(health_relayd); |
| 364 | DBG("Live viewer listener thread cleanup complete"); |
| 365 | stop_threads(); |
| 366 | return NULL; |
| 367 | } |
| 368 | |
| 369 | /* |
| 370 | * This thread manages the dispatching of the requests to worker threads |
| 371 | */ |
| 372 | static |
| 373 | void *thread_dispatcher(void *data) |
| 374 | { |
| 375 | int err = -1; |
| 376 | ssize_t ret; |
| 377 | struct cds_wfq_node *node; |
| 378 | struct relay_command *relay_cmd = NULL; |
| 379 | |
| 380 | DBG("[thread] Live viewer relay dispatcher started"); |
| 381 | |
| 382 | health_register(health_relayd, HEALTH_RELAYD_TYPE_LIVE_DISPATCHER); |
| 383 | |
| 384 | if (testpoint(relayd_thread_live_dispatcher)) { |
| 385 | goto error_testpoint; |
| 386 | } |
| 387 | |
| 388 | health_code_update(); |
| 389 | |
| 390 | while (!CMM_LOAD_SHARED(live_dispatch_thread_exit)) { |
| 391 | health_code_update(); |
| 392 | |
| 393 | /* Atomically prepare the queue futex */ |
| 394 | futex_nto1_prepare(&viewer_cmd_queue.futex); |
| 395 | |
| 396 | do { |
| 397 | health_code_update(); |
| 398 | |
| 399 | /* Dequeue commands */ |
| 400 | node = cds_wfq_dequeue_blocking(&viewer_cmd_queue.queue); |
| 401 | if (node == NULL) { |
| 402 | DBG("Woken up but nothing in the live-viewer " |
| 403 | "relay command queue"); |
| 404 | /* Continue thread execution */ |
| 405 | break; |
| 406 | } |
| 407 | |
| 408 | relay_cmd = caa_container_of(node, struct relay_command, node); |
| 409 | DBG("Dispatching viewer request waiting on sock %d", |
| 410 | relay_cmd->sock->fd); |
| 411 | |
| 412 | /* |
| 413 | * Inform worker thread of the new request. This call is blocking |
| 414 | * so we can be assured that the data will be read at some point in |
| 415 | * time or wait to the end of the world :) |
| 416 | */ |
| 417 | ret = lttng_write(live_relay_cmd_pipe[1], relay_cmd, |
| 418 | sizeof(*relay_cmd)); |
| 419 | free(relay_cmd); |
| 420 | if (ret < sizeof(struct relay_command)) { |
| 421 | PERROR("write cmd pipe"); |
| 422 | goto error; |
| 423 | } |
| 424 | } while (node != NULL); |
| 425 | |
| 426 | /* Futex wait on queue. Blocking call on futex() */ |
| 427 | health_poll_entry(); |
| 428 | futex_nto1_wait(&viewer_cmd_queue.futex); |
| 429 | health_poll_exit(); |
| 430 | } |
| 431 | |
| 432 | /* Normal exit, no error */ |
| 433 | err = 0; |
| 434 | |
| 435 | error: |
| 436 | error_testpoint: |
| 437 | if (err) { |
| 438 | health_error(); |
| 439 | ERR("Health error occurred in %s", __func__); |
| 440 | } |
| 441 | health_unregister(health_relayd); |
| 442 | DBG("Live viewer dispatch thread dying"); |
| 443 | stop_threads(); |
| 444 | return NULL; |
| 445 | } |
| 446 | |
| 447 | /* |
| 448 | * Establish connection with the viewer and check the versions. |
| 449 | * |
| 450 | * Return 0 on success or else negative value. |
| 451 | */ |
| 452 | static |
| 453 | int viewer_connect(struct relay_command *cmd) |
| 454 | { |
| 455 | int ret; |
| 456 | struct lttng_viewer_connect reply, msg; |
| 457 | |
| 458 | assert(cmd); |
| 459 | |
| 460 | cmd->version_check_done = 1; |
| 461 | |
| 462 | health_code_update(); |
| 463 | |
| 464 | /* Get version from the other side. */ |
| 465 | ret = cmd->sock->ops->recvmsg(cmd->sock, &msg, sizeof(msg), 0); |
| 466 | if (ret < 0 || ret != sizeof(msg)) { |
| 467 | if (ret == 0) { |
| 468 | /* Orderly shutdown. Not necessary to print an error. */ |
| 469 | DBG("Socket %d did an orderly shutdown", cmd->sock->fd); |
| 470 | } else { |
| 471 | ERR("Relay failed to receive the version values."); |
| 472 | } |
| 473 | ret = -1; |
| 474 | goto end; |
| 475 | } |
| 476 | |
| 477 | health_code_update(); |
| 478 | |
| 479 | reply.major = RELAYD_VERSION_COMM_MAJOR; |
| 480 | reply.minor = RELAYD_VERSION_COMM_MINOR; |
| 481 | |
| 482 | /* Major versions must be the same */ |
| 483 | if (reply.major != be32toh(msg.major)) { |
| 484 | DBG("Incompatible major versions (%u vs %u)", reply.major, |
| 485 | be32toh(msg.major)); |
| 486 | ret = -1; |
| 487 | goto end; |
| 488 | } |
| 489 | |
| 490 | cmd->major = reply.major; |
| 491 | /* We adapt to the lowest compatible version */ |
| 492 | if (reply.minor <= be32toh(msg.minor)) { |
| 493 | cmd->minor = reply.minor; |
| 494 | } else { |
| 495 | cmd->minor = be32toh(msg.minor); |
| 496 | } |
| 497 | |
| 498 | if (be32toh(msg.type) == VIEWER_CLIENT_COMMAND) { |
| 499 | cmd->type = RELAY_VIEWER_COMMAND; |
| 500 | } else if (be32toh(msg.type) == VIEWER_CLIENT_NOTIFICATION) { |
| 501 | cmd->type = RELAY_VIEWER_NOTIFICATION; |
| 502 | } else { |
| 503 | ERR("Unknown connection type : %u", be32toh(msg.type)); |
| 504 | ret = -1; |
| 505 | goto end; |
| 506 | } |
| 507 | |
| 508 | reply.major = htobe32(reply.major); |
| 509 | reply.minor = htobe32(reply.minor); |
| 510 | if (cmd->type == RELAY_VIEWER_COMMAND) { |
| 511 | reply.viewer_session_id = htobe64(++last_relay_viewer_session_id); |
| 512 | } |
| 513 | |
| 514 | health_code_update(); |
| 515 | |
| 516 | ret = cmd->sock->ops->sendmsg(cmd->sock, &reply, |
| 517 | sizeof(struct lttng_viewer_connect), 0); |
| 518 | if (ret < 0) { |
| 519 | ERR("Relay sending version"); |
| 520 | } |
| 521 | |
| 522 | health_code_update(); |
| 523 | |
| 524 | DBG("Version check done using protocol %u.%u", cmd->major, cmd->minor); |
| 525 | ret = 0; |
| 526 | |
| 527 | end: |
| 528 | return ret; |
| 529 | } |
| 530 | |
| 531 | /* |
| 532 | * Send the viewer the list of current sessions. |
| 533 | * |
| 534 | * Return 0 on success or else a negative value. |
| 535 | */ |
| 536 | static |
| 537 | int viewer_list_sessions(struct relay_command *cmd, |
| 538 | struct lttng_ht *sessions_ht) |
| 539 | { |
| 540 | int ret; |
| 541 | struct lttng_viewer_list_sessions session_list; |
| 542 | unsigned long count; |
| 543 | long approx_before, approx_after; |
| 544 | struct lttng_ht_node_ulong *node; |
| 545 | struct lttng_ht_iter iter; |
| 546 | struct lttng_viewer_session send_session; |
| 547 | struct relay_session *session; |
| 548 | |
| 549 | DBG("List sessions received"); |
| 550 | |
| 551 | if (cmd->version_check_done == 0) { |
| 552 | ERR("Trying to list sessions before version check"); |
| 553 | ret = -1; |
| 554 | goto end_no_session; |
| 555 | } |
| 556 | |
| 557 | rcu_read_lock(); |
| 558 | cds_lfht_count_nodes(sessions_ht->ht, &approx_before, &count, &approx_after); |
| 559 | session_list.sessions_count = htobe32(count); |
| 560 | |
| 561 | health_code_update(); |
| 562 | |
| 563 | ret = cmd->sock->ops->sendmsg(cmd->sock, &session_list, |
| 564 | sizeof(session_list), 0); |
| 565 | if (ret < 0) { |
| 566 | ERR("Relay sending sessions list"); |
| 567 | goto end_unlock; |
| 568 | } |
| 569 | |
| 570 | health_code_update(); |
| 571 | |
| 572 | cds_lfht_for_each_entry(sessions_ht->ht, &iter.iter, node, node) { |
| 573 | health_code_update(); |
| 574 | |
| 575 | node = lttng_ht_iter_get_node_ulong(&iter); |
| 576 | if (!node) { |
| 577 | goto end_unlock; |
| 578 | } |
| 579 | session = caa_container_of(node, struct relay_session, session_n); |
| 580 | |
| 581 | strncpy(send_session.session_name, session->session_name, |
| 582 | sizeof(send_session.session_name)); |
| 583 | strncpy(send_session.hostname, session->hostname, |
| 584 | sizeof(send_session.hostname)); |
| 585 | send_session.id = htobe64(session->id); |
| 586 | send_session.live_timer = htobe32(session->live_timer); |
| 587 | send_session.clients = htobe32(session->viewer_attached); |
| 588 | send_session.streams = htobe32(session->stream_count); |
| 589 | |
| 590 | health_code_update(); |
| 591 | |
| 592 | ret = cmd->sock->ops->sendmsg(cmd->sock, &send_session, |
| 593 | sizeof(send_session), 0); |
| 594 | if (ret < 0) { |
| 595 | ERR("Relay sending session info"); |
| 596 | goto end_unlock; |
| 597 | } |
| 598 | } |
| 599 | health_code_update(); |
| 600 | |
| 601 | rcu_read_unlock(); |
| 602 | ret = 0; |
| 603 | goto end; |
| 604 | |
| 605 | end_unlock: |
| 606 | rcu_read_unlock(); |
| 607 | |
| 608 | end: |
| 609 | end_no_session: |
| 610 | return ret; |
| 611 | } |
| 612 | |
| 613 | /* |
| 614 | * Open index file using a given viewer stream. |
| 615 | * |
| 616 | * Return 0 on success or else a negative value. |
| 617 | */ |
| 618 | static int open_index(struct relay_viewer_stream *stream) |
| 619 | { |
| 620 | int ret; |
| 621 | char fullpath[PATH_MAX]; |
| 622 | struct ctf_packet_index_file_hdr hdr; |
| 623 | |
| 624 | if (stream->tracefile_count > 0) { |
| 625 | ret = snprintf(fullpath, sizeof(fullpath), "%s/" DEFAULT_INDEX_DIR "/%s_%" |
| 626 | PRIu64 DEFAULT_INDEX_FILE_SUFFIX, stream->path_name, |
| 627 | stream->channel_name, stream->tracefile_count_current); |
| 628 | } else { |
| 629 | ret = snprintf(fullpath, sizeof(fullpath), "%s/" DEFAULT_INDEX_DIR "/%s" |
| 630 | DEFAULT_INDEX_FILE_SUFFIX, stream->path_name, |
| 631 | stream->channel_name); |
| 632 | } |
| 633 | if (ret < 0) { |
| 634 | PERROR("snprintf index path"); |
| 635 | goto error; |
| 636 | } |
| 637 | |
| 638 | DBG("Opening index file %s in read only", fullpath); |
| 639 | ret = open(fullpath, O_RDONLY); |
| 640 | if (ret < 0) { |
| 641 | if (errno == ENOENT) { |
| 642 | ret = -ENOENT; |
| 643 | goto error; |
| 644 | } else { |
| 645 | PERROR("opening index in read-only"); |
| 646 | } |
| 647 | goto error; |
| 648 | } |
| 649 | stream->index_read_fd = ret; |
| 650 | DBG("Opening index file %s in read only, (fd: %d)", fullpath, ret); |
| 651 | |
| 652 | ret = lttng_read(stream->index_read_fd, &hdr, sizeof(hdr)); |
| 653 | if (ret < sizeof(hdr)) { |
| 654 | PERROR("Reading index header"); |
| 655 | goto error; |
| 656 | } |
| 657 | if (be32toh(hdr.magic) != CTF_INDEX_MAGIC) { |
| 658 | ERR("Invalid header magic"); |
| 659 | ret = -1; |
| 660 | goto error; |
| 661 | } |
| 662 | if (be32toh(hdr.index_major) != CTF_INDEX_MAJOR || |
| 663 | be32toh(hdr.index_minor) != CTF_INDEX_MINOR) { |
| 664 | ERR("Invalid header version"); |
| 665 | ret = -1; |
| 666 | goto error; |
| 667 | } |
| 668 | ret = 0; |
| 669 | |
| 670 | error: |
| 671 | return ret; |
| 672 | } |
| 673 | |
| 674 | /* |
| 675 | * Allocate and init a new viewer_stream. |
| 676 | * |
| 677 | * Copies the values from the stream passed in parameter and insert the new |
| 678 | * stream in the viewer_streams_ht. |
| 679 | * |
| 680 | * MUST be called with rcu_read_lock held. |
| 681 | * |
| 682 | * Returns 0 on success or a negative value on error. |
| 683 | */ |
| 684 | static |
| 685 | int init_viewer_stream(struct relay_stream *stream, int seek_last) |
| 686 | { |
| 687 | int ret; |
| 688 | struct relay_viewer_stream *viewer_stream; |
| 689 | |
| 690 | assert(stream); |
| 691 | |
| 692 | viewer_stream = zmalloc(sizeof(*viewer_stream)); |
| 693 | if (!viewer_stream) { |
| 694 | PERROR("relay viewer stream zmalloc"); |
| 695 | ret = -1; |
| 696 | goto error; |
| 697 | } |
| 698 | viewer_stream->session_id = stream->session->id; |
| 699 | viewer_stream->stream_handle = stream->stream_handle; |
| 700 | viewer_stream->path_name = strndup(stream->path_name, |
| 701 | LTTNG_VIEWER_PATH_MAX); |
| 702 | viewer_stream->channel_name = strndup(stream->channel_name, |
| 703 | LTTNG_VIEWER_NAME_MAX); |
| 704 | viewer_stream->tracefile_count = stream->tracefile_count; |
| 705 | viewer_stream->metadata_flag = stream->metadata_flag; |
| 706 | viewer_stream->tracefile_count_last = -1ULL; |
| 707 | if (seek_last) { |
| 708 | viewer_stream->tracefile_count_current = |
| 709 | stream->tracefile_count_current; |
| 710 | } else { |
| 711 | viewer_stream->tracefile_count_current = |
| 712 | stream->oldest_tracefile_id; |
| 713 | } |
| 714 | |
| 715 | viewer_stream->ctf_trace = stream->ctf_trace; |
| 716 | if (viewer_stream->metadata_flag) { |
| 717 | viewer_stream->ctf_trace->viewer_metadata_stream = |
| 718 | viewer_stream; |
| 719 | } |
| 720 | uatomic_inc(&viewer_stream->ctf_trace->refcount); |
| 721 | |
| 722 | lttng_ht_node_init_u64(&viewer_stream->stream_n, stream->stream_handle); |
| 723 | lttng_ht_add_unique_u64(viewer_streams_ht, &viewer_stream->stream_n); |
| 724 | |
| 725 | viewer_stream->index_read_fd = -1; |
| 726 | viewer_stream->read_fd = -1; |
| 727 | |
| 728 | /* |
| 729 | * This is to avoid a race between the initialization of this object and |
| 730 | * the close of the given stream. If the stream is unable to find this |
| 731 | * viewer stream when closing, this copy will at least take the latest |
| 732 | * value. |
| 733 | * We also need that for the seek_last. |
| 734 | */ |
| 735 | viewer_stream->total_index_received = stream->total_index_received; |
| 736 | |
| 737 | /* |
| 738 | * If we never received an index for the current stream, delay |
| 739 | * the opening of the index, otherwise open it right now. |
| 740 | */ |
| 741 | if (viewer_stream->tracefile_count_current == |
| 742 | stream->tracefile_count_current && |
| 743 | viewer_stream->total_index_received == 0) { |
| 744 | viewer_stream->index_read_fd = -1; |
| 745 | } else { |
| 746 | ret = open_index(viewer_stream); |
| 747 | if (ret < 0) { |
| 748 | goto error; |
| 749 | } |
| 750 | } |
| 751 | |
| 752 | if (seek_last && viewer_stream->index_read_fd > 0) { |
| 753 | ret = lseek(viewer_stream->index_read_fd, |
| 754 | viewer_stream->total_index_received * |
| 755 | sizeof(struct ctf_packet_index), |
| 756 | SEEK_CUR); |
| 757 | if (ret < 0) { |
| 758 | goto error; |
| 759 | } |
| 760 | viewer_stream->last_sent_index = |
| 761 | viewer_stream->total_index_received; |
| 762 | } |
| 763 | |
| 764 | ret = 0; |
| 765 | |
| 766 | error: |
| 767 | return ret; |
| 768 | } |
| 769 | |
| 770 | /* |
| 771 | * Rotate a stream to the next tracefile. |
| 772 | * |
| 773 | * Returns 0 on success, 1 on EOF, a negative value on error. |
| 774 | */ |
| 775 | static |
| 776 | int rotate_viewer_stream(struct relay_viewer_stream *viewer_stream, |
| 777 | struct relay_stream *stream) |
| 778 | { |
| 779 | int ret; |
| 780 | uint64_t tracefile_id; |
| 781 | |
| 782 | assert(viewer_stream); |
| 783 | |
| 784 | tracefile_id = (viewer_stream->tracefile_count_current + 1) % |
| 785 | viewer_stream->tracefile_count; |
| 786 | /* |
| 787 | * Detect the last tracefile to open. |
| 788 | */ |
| 789 | if (viewer_stream->tracefile_count_last != -1ULL && |
| 790 | viewer_stream->tracefile_count_last == |
| 791 | viewer_stream->tracefile_count_current) { |
| 792 | ret = 1; |
| 793 | goto end; |
| 794 | } |
| 795 | |
| 796 | if (stream) { |
| 797 | pthread_mutex_lock(&stream->viewer_stream_rotation_lock); |
| 798 | } |
| 799 | /* |
| 800 | * The writer and the reader are not working in the same |
| 801 | * tracefile, we can read up to EOF, we don't care about the |
| 802 | * total_index_received. |
| 803 | */ |
| 804 | if (!stream || (stream->tracefile_count_current != tracefile_id)) { |
| 805 | viewer_stream->close_write_flag = 1; |
| 806 | } else { |
| 807 | /* |
| 808 | * We are opening a file that is still open in write, make |
| 809 | * sure we limit our reading to the number of indexes |
| 810 | * received. |
| 811 | */ |
| 812 | viewer_stream->close_write_flag = 0; |
| 813 | if (stream) { |
| 814 | viewer_stream->total_index_received = |
| 815 | stream->total_index_received; |
| 816 | } |
| 817 | } |
| 818 | viewer_stream->tracefile_count_current = tracefile_id; |
| 819 | |
| 820 | ret = close(viewer_stream->index_read_fd); |
| 821 | if (ret < 0) { |
| 822 | PERROR("close index file %d", |
| 823 | viewer_stream->index_read_fd); |
| 824 | } |
| 825 | viewer_stream->index_read_fd = -1; |
| 826 | ret = close(viewer_stream->read_fd); |
| 827 | if (ret < 0) { |
| 828 | PERROR("close tracefile %d", |
| 829 | viewer_stream->read_fd); |
| 830 | } |
| 831 | viewer_stream->read_fd = -1; |
| 832 | |
| 833 | pthread_mutex_lock(&viewer_stream->overwrite_lock); |
| 834 | viewer_stream->abort_flag = 0; |
| 835 | pthread_mutex_unlock(&viewer_stream->overwrite_lock); |
| 836 | |
| 837 | viewer_stream->index_read_fd = -1; |
| 838 | viewer_stream->read_fd = -1; |
| 839 | |
| 840 | if (stream) { |
| 841 | pthread_mutex_unlock(&stream->viewer_stream_rotation_lock); |
| 842 | } |
| 843 | ret = open_index(viewer_stream); |
| 844 | if (ret < 0) { |
| 845 | goto error; |
| 846 | } |
| 847 | |
| 848 | ret = 0; |
| 849 | |
| 850 | end: |
| 851 | error: |
| 852 | return ret; |
| 853 | } |
| 854 | |
| 855 | /* |
| 856 | * Send the viewer the list of current sessions. |
| 857 | */ |
| 858 | static |
| 859 | int viewer_attach_session(struct relay_command *cmd, |
| 860 | struct lttng_ht *sessions_ht) |
| 861 | { |
| 862 | int ret, send_streams = 0; |
| 863 | uint32_t nb_streams = 0, nb_streams_ready = 0; |
| 864 | struct lttng_viewer_attach_session_request request; |
| 865 | struct lttng_viewer_attach_session_response response; |
| 866 | struct lttng_viewer_stream send_stream; |
| 867 | struct relay_stream *stream; |
| 868 | struct relay_viewer_stream *viewer_stream; |
| 869 | struct lttng_ht_node_ulong *node; |
| 870 | struct lttng_ht_node_u64 *node64; |
| 871 | struct lttng_ht_iter iter; |
| 872 | struct relay_session *session; |
| 873 | int seek_last = 0; |
| 874 | |
| 875 | assert(cmd); |
| 876 | assert(sessions_ht); |
| 877 | |
| 878 | DBG("Attach session received"); |
| 879 | |
| 880 | if (cmd->version_check_done == 0) { |
| 881 | ERR("Trying to attach session before version check"); |
| 882 | ret = -1; |
| 883 | goto end_no_session; |
| 884 | } |
| 885 | |
| 886 | health_code_update(); |
| 887 | |
| 888 | ret = cmd->sock->ops->recvmsg(cmd->sock, &request, sizeof(request), 0); |
| 889 | if (ret < 0 || ret != sizeof(request)) { |
| 890 | if (ret == 0) { |
| 891 | /* Orderly shutdown. Not necessary to print an error. */ |
| 892 | DBG("Socket %d did an orderly shutdown", cmd->sock->fd); |
| 893 | } else { |
| 894 | ERR("Relay failed to receive the attach parameters."); |
| 895 | } |
| 896 | ret = -1; |
| 897 | goto error; |
| 898 | } |
| 899 | |
| 900 | health_code_update(); |
| 901 | |
| 902 | rcu_read_lock(); |
| 903 | lttng_ht_lookup(sessions_ht, |
| 904 | (void *)((unsigned long) be64toh(request.session_id)), &iter); |
| 905 | node = lttng_ht_iter_get_node_ulong(&iter); |
| 906 | if (node == NULL) { |
| 907 | DBG("Relay session %" PRIu64 " not found", |
| 908 | be64toh(request.session_id)); |
| 909 | response.status = htobe32(VIEWER_ATTACH_UNK); |
| 910 | goto send_reply; |
| 911 | } |
| 912 | |
| 913 | session = caa_container_of(node, struct relay_session, session_n); |
| 914 | if (cmd->session_id == session->id) { |
| 915 | /* Same viewer already attached, just send the stream list. */ |
| 916 | send_streams = 1; |
| 917 | response.status = htobe32(VIEWER_ATTACH_OK); |
| 918 | } else if (session->viewer_attached != 0) { |
| 919 | DBG("Already a viewer attached"); |
| 920 | response.status = htobe32(VIEWER_ATTACH_ALREADY); |
| 921 | goto send_reply; |
| 922 | } else if (session->live_timer == 0) { |
| 923 | DBG("Not live session"); |
| 924 | response.status = htobe32(VIEWER_ATTACH_NOT_LIVE); |
| 925 | goto send_reply; |
| 926 | } else { |
| 927 | session->viewer_attached++; |
| 928 | send_streams = 1; |
| 929 | response.status = htobe32(VIEWER_ATTACH_OK); |
| 930 | cmd->session_id = session->id; |
| 931 | cmd->session = session; |
| 932 | } |
| 933 | |
| 934 | switch (be32toh(request.seek)) { |
| 935 | case VIEWER_SEEK_BEGINNING: |
| 936 | /* Default behaviour. */ |
| 937 | break; |
| 938 | case VIEWER_SEEK_LAST: |
| 939 | seek_last = 1; |
| 940 | break; |
| 941 | default: |
| 942 | ERR("Wrong seek parameter"); |
| 943 | response.status = htobe32(VIEWER_ATTACH_SEEK_ERR); |
| 944 | send_streams = 0; |
| 945 | goto send_reply; |
| 946 | } |
| 947 | |
| 948 | if (send_streams) { |
| 949 | /* We should only be there if we have a session to attach to. */ |
| 950 | assert(session); |
| 951 | |
| 952 | /* |
| 953 | * Fill the viewer_streams_ht to count the number of streams |
| 954 | * ready to be sent and avoid concurrency issues on the |
| 955 | * relay_streams_ht and don't rely on a total session stream count. |
| 956 | */ |
| 957 | cds_lfht_for_each_entry(relay_streams_ht->ht, &iter.iter, node, node) { |
| 958 | struct relay_viewer_stream *vstream; |
| 959 | |
| 960 | health_code_update(); |
| 961 | |
| 962 | node = lttng_ht_iter_get_node_ulong(&iter); |
| 963 | if (!node) { |
| 964 | continue; |
| 965 | } |
| 966 | stream = caa_container_of(node, struct relay_stream, stream_n); |
| 967 | if (stream->session != cmd->session) { |
| 968 | continue; |
| 969 | } |
| 970 | nb_streams++; |
| 971 | |
| 972 | /* |
| 973 | * Don't send streams with no ctf_trace, they are not |
| 974 | * ready to be read. |
| 975 | */ |
| 976 | if (!stream->ctf_trace || !stream->viewer_ready) { |
| 977 | continue; |
| 978 | } |
| 979 | nb_streams_ready++; |
| 980 | |
| 981 | vstream = live_find_viewer_stream_by_id(stream->stream_handle); |
| 982 | if (!vstream) { |
| 983 | ret = init_viewer_stream(stream, seek_last); |
| 984 | if (ret < 0) { |
| 985 | goto end_unlock; |
| 986 | } |
| 987 | } |
| 988 | } |
| 989 | |
| 990 | /* We must have the same amount of existing stream and ready stream. */ |
| 991 | if (nb_streams != nb_streams_ready) { |
| 992 | nb_streams = 0; |
| 993 | } |
| 994 | response.streams_count = htobe32(nb_streams); |
| 995 | } |
| 996 | |
| 997 | send_reply: |
| 998 | health_code_update(); |
| 999 | ret = cmd->sock->ops->sendmsg(cmd->sock, &response, sizeof(response), 0); |
| 1000 | if (ret < 0) { |
| 1001 | ERR("Relay sending viewer attach response"); |
| 1002 | goto end_unlock; |
| 1003 | } |
| 1004 | health_code_update(); |
| 1005 | |
| 1006 | /* |
| 1007 | * Unknown or empty session, just return gracefully, the viewer knows what |
| 1008 | * is happening. |
| 1009 | */ |
| 1010 | if (!send_streams || !nb_streams) { |
| 1011 | ret = 0; |
| 1012 | goto end_unlock; |
| 1013 | } |
| 1014 | |
| 1015 | /* We should only be there if we have a session to attach to. */ |
| 1016 | assert(session); |
| 1017 | cds_lfht_for_each_entry(viewer_streams_ht->ht, &iter.iter, node, node) { |
| 1018 | health_code_update(); |
| 1019 | |
| 1020 | node64 = lttng_ht_iter_get_node_u64(&iter); |
| 1021 | if (!node64) { |
| 1022 | continue; |
| 1023 | } |
| 1024 | viewer_stream = caa_container_of(node64, struct relay_viewer_stream, |
| 1025 | stream_n); |
| 1026 | if (viewer_stream->session_id != cmd->session->id) { |
| 1027 | continue; |
| 1028 | } |
| 1029 | |
| 1030 | send_stream.id = htobe64(viewer_stream->stream_handle); |
| 1031 | send_stream.ctf_trace_id = htobe64(viewer_stream->ctf_trace->id); |
| 1032 | send_stream.metadata_flag = htobe32(viewer_stream->metadata_flag); |
| 1033 | strncpy(send_stream.path_name, viewer_stream->path_name, |
| 1034 | sizeof(send_stream.path_name)); |
| 1035 | strncpy(send_stream.channel_name, viewer_stream->channel_name, |
| 1036 | sizeof(send_stream.channel_name)); |
| 1037 | |
| 1038 | ret = cmd->sock->ops->sendmsg(cmd->sock, &send_stream, |
| 1039 | sizeof(send_stream), 0); |
| 1040 | if (ret < 0) { |
| 1041 | ERR("Relay sending stream %" PRIu64, viewer_stream->stream_handle); |
| 1042 | goto end_unlock; |
| 1043 | } |
| 1044 | DBG("Sent stream %" PRIu64 " to viewer", viewer_stream->stream_handle); |
| 1045 | } |
| 1046 | ret = 0; |
| 1047 | |
| 1048 | end_unlock: |
| 1049 | rcu_read_unlock(); |
| 1050 | end_no_session: |
| 1051 | error: |
| 1052 | return ret; |
| 1053 | } |
| 1054 | |
| 1055 | /* |
| 1056 | * Get viewer stream from stream id. |
| 1057 | * |
| 1058 | * RCU read side lock MUST be acquired. |
| 1059 | */ |
| 1060 | struct relay_viewer_stream *live_find_viewer_stream_by_id(uint64_t stream_id) |
| 1061 | { |
| 1062 | struct lttng_ht_node_u64 *node; |
| 1063 | struct lttng_ht_iter iter; |
| 1064 | struct relay_viewer_stream *stream = NULL; |
| 1065 | |
| 1066 | lttng_ht_lookup(viewer_streams_ht, &stream_id, &iter); |
| 1067 | node = lttng_ht_iter_get_node_u64(&iter); |
| 1068 | if (node == NULL) { |
| 1069 | DBG("Relay viewer stream %" PRIu64 " not found", stream_id); |
| 1070 | goto end; |
| 1071 | } |
| 1072 | stream = caa_container_of(node, struct relay_viewer_stream, stream_n); |
| 1073 | |
| 1074 | end: |
| 1075 | return stream; |
| 1076 | } |
| 1077 | |
| 1078 | static |
| 1079 | void deferred_free_viewer_stream(struct rcu_head *head) |
| 1080 | { |
| 1081 | struct relay_viewer_stream *stream = |
| 1082 | caa_container_of(head, struct relay_viewer_stream, rcu_node); |
| 1083 | |
| 1084 | free(stream->path_name); |
| 1085 | free(stream->channel_name); |
| 1086 | free(stream); |
| 1087 | } |
| 1088 | |
| 1089 | static |
| 1090 | void delete_viewer_stream(struct relay_viewer_stream *vstream) |
| 1091 | { |
| 1092 | int delret; |
| 1093 | struct lttng_ht_iter iter; |
| 1094 | |
| 1095 | iter.iter.node = &vstream->stream_n.node; |
| 1096 | delret = lttng_ht_del(viewer_streams_ht, &iter); |
| 1097 | assert(!delret); |
| 1098 | } |
| 1099 | |
| 1100 | static |
| 1101 | void destroy_viewer_stream(struct relay_viewer_stream *vstream) |
| 1102 | { |
| 1103 | unsigned long ret_ref; |
| 1104 | int ret; |
| 1105 | |
| 1106 | assert(vstream); |
| 1107 | ret_ref = uatomic_add_return(&vstream->ctf_trace->refcount, -1); |
| 1108 | assert(ret_ref >= 0); |
| 1109 | |
| 1110 | if (vstream->read_fd >= 0) { |
| 1111 | ret = close(vstream->read_fd); |
| 1112 | if (ret < 0) { |
| 1113 | PERROR("close read_fd"); |
| 1114 | } |
| 1115 | } |
| 1116 | if (vstream->index_read_fd >= 0) { |
| 1117 | ret = close(vstream->index_read_fd); |
| 1118 | if (ret < 0) { |
| 1119 | PERROR("close index_read_fd"); |
| 1120 | } |
| 1121 | } |
| 1122 | |
| 1123 | /* |
| 1124 | * If the only stream left in the HT is the metadata stream, |
| 1125 | * we need to remove it because we won't detect a EOF for this |
| 1126 | * stream. |
| 1127 | */ |
| 1128 | if (ret_ref == 1 && vstream->ctf_trace->viewer_metadata_stream) { |
| 1129 | delete_viewer_stream(vstream->ctf_trace->viewer_metadata_stream); |
| 1130 | destroy_viewer_stream(vstream->ctf_trace->viewer_metadata_stream); |
| 1131 | vstream->ctf_trace->metadata_stream = NULL; |
| 1132 | DBG("Freeing ctf_trace %" PRIu64, vstream->ctf_trace->id); |
| 1133 | /* |
| 1134 | * The streaming-side is already closed and we can't receive a new |
| 1135 | * stream concurrently at this point (since the session is being |
| 1136 | * destroyed), so when we detect the refcount equals 0, we are the |
| 1137 | * only owners of the ctf_trace and we can free it ourself. |
| 1138 | */ |
| 1139 | free(vstream->ctf_trace); |
| 1140 | } |
| 1141 | |
| 1142 | call_rcu(&vstream->rcu_node, deferred_free_viewer_stream); |
| 1143 | } |
| 1144 | |
| 1145 | /* |
| 1146 | * Send the next index for a stream. |
| 1147 | * |
| 1148 | * Return 0 on success or else a negative value. |
| 1149 | */ |
| 1150 | static |
| 1151 | int viewer_get_next_index(struct relay_command *cmd, |
| 1152 | struct lttng_ht *sessions_ht) |
| 1153 | { |
| 1154 | int ret; |
| 1155 | struct lttng_viewer_get_next_index request_index; |
| 1156 | struct lttng_viewer_index viewer_index; |
| 1157 | struct ctf_packet_index packet_index; |
| 1158 | struct relay_viewer_stream *vstream; |
| 1159 | struct relay_stream *rstream; |
| 1160 | |
| 1161 | assert(cmd); |
| 1162 | assert(sessions_ht); |
| 1163 | |
| 1164 | DBG("Viewer get next index"); |
| 1165 | |
| 1166 | if (cmd->version_check_done == 0) { |
| 1167 | ERR("Trying to request index before version check"); |
| 1168 | ret = -1; |
| 1169 | goto end_no_session; |
| 1170 | } |
| 1171 | |
| 1172 | health_code_update(); |
| 1173 | ret = cmd->sock->ops->recvmsg(cmd->sock, &request_index, |
| 1174 | sizeof(request_index), 0); |
| 1175 | if (ret < 0 || ret != sizeof(request_index)) { |
| 1176 | ret = -1; |
| 1177 | ERR("Relay didn't receive the whole packet"); |
| 1178 | goto end; |
| 1179 | } |
| 1180 | health_code_update(); |
| 1181 | |
| 1182 | rcu_read_lock(); |
| 1183 | vstream = live_find_viewer_stream_by_id(be64toh(request_index.stream_id)); |
| 1184 | if (!vstream) { |
| 1185 | ret = -1; |
| 1186 | goto end_unlock; |
| 1187 | } |
| 1188 | |
| 1189 | memset(&viewer_index, 0, sizeof(viewer_index)); |
| 1190 | |
| 1191 | /* |
| 1192 | * The viewer should not ask for index on metadata stream. |
| 1193 | */ |
| 1194 | if (vstream->metadata_flag) { |
| 1195 | viewer_index.status = htobe32(VIEWER_INDEX_HUP); |
| 1196 | goto send_reply; |
| 1197 | } |
| 1198 | |
| 1199 | /* First time, we open the index file */ |
| 1200 | if (vstream->index_read_fd < 0) { |
| 1201 | ret = open_index(vstream); |
| 1202 | if (ret == -ENOENT) { |
| 1203 | /* |
| 1204 | * The index is created only when the first data packet arrives, it |
| 1205 | * might not be ready at the beginning of the session |
| 1206 | */ |
| 1207 | viewer_index.status = htobe32(VIEWER_INDEX_RETRY); |
| 1208 | goto send_reply; |
| 1209 | } else if (ret < 0) { |
| 1210 | viewer_index.status = htobe32(VIEWER_INDEX_ERR); |
| 1211 | goto send_reply; |
| 1212 | } |
| 1213 | } |
| 1214 | |
| 1215 | rstream = relay_stream_find_by_id(vstream->stream_handle); |
| 1216 | if (rstream) { |
| 1217 | if (vstream->abort_flag) { |
| 1218 | /* Rotate on abort (overwrite). */ |
| 1219 | DBG("Viewer rotate because of overwrite"); |
| 1220 | ret = rotate_viewer_stream(vstream, rstream); |
| 1221 | if (ret < 0) { |
| 1222 | goto end_unlock; |
| 1223 | } else if (ret == 1) { |
| 1224 | viewer_index.status = htobe32(VIEWER_INDEX_HUP); |
| 1225 | delete_viewer_stream(vstream); |
| 1226 | destroy_viewer_stream(vstream); |
| 1227 | goto send_reply; |
| 1228 | } |
| 1229 | } |
| 1230 | pthread_mutex_lock(&rstream->viewer_stream_rotation_lock); |
| 1231 | if (rstream->tracefile_count_current == vstream->tracefile_count_current) { |
| 1232 | if (rstream->beacon_ts_end != -1ULL && |
| 1233 | vstream->last_sent_index == rstream->total_index_received) { |
| 1234 | viewer_index.status = htobe32(VIEWER_INDEX_INACTIVE); |
| 1235 | viewer_index.timestamp_end = htobe64(rstream->beacon_ts_end); |
| 1236 | pthread_mutex_unlock(&rstream->viewer_stream_rotation_lock); |
| 1237 | goto send_reply; |
| 1238 | /* |
| 1239 | * Reader and writer are working in the same tracefile, so we care |
| 1240 | * about the number of index received and sent. Otherwise, we read |
| 1241 | * up to EOF. |
| 1242 | */ |
| 1243 | } else if (rstream->total_index_received <= vstream->last_sent_index |
| 1244 | && !vstream->close_write_flag) { |
| 1245 | pthread_mutex_unlock(&rstream->viewer_stream_rotation_lock); |
| 1246 | /* No new index to send, retry later. */ |
| 1247 | viewer_index.status = htobe32(VIEWER_INDEX_RETRY); |
| 1248 | goto send_reply; |
| 1249 | } |
| 1250 | } |
| 1251 | pthread_mutex_unlock(&rstream->viewer_stream_rotation_lock); |
| 1252 | } else if (!rstream && vstream->close_write_flag && |
| 1253 | vstream->total_index_received == vstream->last_sent_index) { |
| 1254 | /* Last index sent and current tracefile closed in write */ |
| 1255 | viewer_index.status = htobe32(VIEWER_INDEX_HUP); |
| 1256 | delete_viewer_stream(vstream); |
| 1257 | destroy_viewer_stream(vstream); |
| 1258 | goto send_reply; |
| 1259 | } else { |
| 1260 | vstream->close_write_flag = 1; |
| 1261 | } |
| 1262 | |
| 1263 | if (!vstream->ctf_trace->metadata_received || |
| 1264 | vstream->ctf_trace->metadata_received > |
| 1265 | vstream->ctf_trace->metadata_sent) { |
| 1266 | viewer_index.flags |= LTTNG_VIEWER_FLAG_NEW_METADATA; |
| 1267 | } |
| 1268 | |
| 1269 | pthread_mutex_lock(&vstream->overwrite_lock); |
| 1270 | if (vstream->abort_flag) { |
| 1271 | /* |
| 1272 | * The file is being overwritten by the writer, we cannot |
| 1273 | * use it. |
| 1274 | */ |
| 1275 | viewer_index.status = htobe32(VIEWER_INDEX_RETRY); |
| 1276 | pthread_mutex_unlock(&vstream->overwrite_lock); |
| 1277 | ret = rotate_viewer_stream(vstream, rstream); |
| 1278 | if (ret < 0) { |
| 1279 | goto end_unlock; |
| 1280 | } else if (ret == 1) { |
| 1281 | viewer_index.status = htobe32(VIEWER_INDEX_HUP); |
| 1282 | delete_viewer_stream(vstream); |
| 1283 | destroy_viewer_stream(vstream); |
| 1284 | goto send_reply; |
| 1285 | } |
| 1286 | goto send_reply; |
| 1287 | } |
| 1288 | ret = lttng_read(vstream->index_read_fd, &packet_index, |
| 1289 | sizeof(packet_index)); |
| 1290 | pthread_mutex_unlock(&vstream->overwrite_lock); |
| 1291 | if (ret < sizeof(packet_index)) { |
| 1292 | /* |
| 1293 | * The tracefile is closed in write, so we read up to EOF. |
| 1294 | */ |
| 1295 | if (vstream->close_write_flag == 1) { |
| 1296 | viewer_index.status = htobe32(VIEWER_INDEX_RETRY); |
| 1297 | /* Rotate on normal EOF */ |
| 1298 | ret = rotate_viewer_stream(vstream, rstream); |
| 1299 | if (ret < 0) { |
| 1300 | goto end_unlock; |
| 1301 | } else if (ret == 1) { |
| 1302 | viewer_index.status = htobe32(VIEWER_INDEX_HUP); |
| 1303 | delete_viewer_stream(vstream); |
| 1304 | destroy_viewer_stream(vstream); |
| 1305 | goto send_reply; |
| 1306 | } |
| 1307 | } else { |
| 1308 | PERROR("Relay reading index file %d", |
| 1309 | vstream->index_read_fd); |
| 1310 | viewer_index.status = htobe32(VIEWER_INDEX_ERR); |
| 1311 | } |
| 1312 | goto send_reply; |
| 1313 | } else { |
| 1314 | viewer_index.status = htobe32(VIEWER_INDEX_OK); |
| 1315 | vstream->last_sent_index++; |
| 1316 | } |
| 1317 | |
| 1318 | /* |
| 1319 | * Indexes are stored in big endian, no need to switch before sending. |
| 1320 | */ |
| 1321 | viewer_index.offset = packet_index.offset; |
| 1322 | viewer_index.packet_size = packet_index.packet_size; |
| 1323 | viewer_index.content_size = packet_index.content_size; |
| 1324 | viewer_index.timestamp_begin = packet_index.timestamp_begin; |
| 1325 | viewer_index.timestamp_end = packet_index.timestamp_end; |
| 1326 | viewer_index.events_discarded = packet_index.events_discarded; |
| 1327 | viewer_index.stream_id = packet_index.stream_id; |
| 1328 | |
| 1329 | send_reply: |
| 1330 | viewer_index.flags = htobe32(viewer_index.flags); |
| 1331 | health_code_update(); |
| 1332 | ret = cmd->sock->ops->sendmsg(cmd->sock, &viewer_index, |
| 1333 | sizeof(viewer_index), 0); |
| 1334 | if (ret < 0) { |
| 1335 | ERR("Relay index to viewer"); |
| 1336 | goto end_unlock; |
| 1337 | } |
| 1338 | health_code_update(); |
| 1339 | |
| 1340 | DBG("Index %" PRIu64 "for stream %" PRIu64 "sent", |
| 1341 | vstream->last_sent_index, vstream->stream_handle); |
| 1342 | |
| 1343 | end_unlock: |
| 1344 | rcu_read_unlock(); |
| 1345 | |
| 1346 | end_no_session: |
| 1347 | end: |
| 1348 | return ret; |
| 1349 | } |
| 1350 | |
| 1351 | /* |
| 1352 | * Send the next index for a stream |
| 1353 | * |
| 1354 | * Return 0 on success or else a negative value. |
| 1355 | */ |
| 1356 | static |
| 1357 | int viewer_get_packet(struct relay_command *cmd) |
| 1358 | { |
| 1359 | int ret, send_data = 0; |
| 1360 | char *data = NULL; |
| 1361 | uint32_t len = 0; |
| 1362 | ssize_t read_len; |
| 1363 | struct lttng_viewer_get_packet get_packet_info; |
| 1364 | struct lttng_viewer_trace_packet reply; |
| 1365 | struct relay_viewer_stream *stream; |
| 1366 | |
| 1367 | assert(cmd); |
| 1368 | |
| 1369 | DBG2("Relay get data packet"); |
| 1370 | |
| 1371 | if (cmd->version_check_done == 0) { |
| 1372 | ERR("Trying to get packet before version check"); |
| 1373 | ret = -1; |
| 1374 | goto end; |
| 1375 | } |
| 1376 | |
| 1377 | health_code_update(); |
| 1378 | ret = cmd->sock->ops->recvmsg(cmd->sock, &get_packet_info, |
| 1379 | sizeof(get_packet_info), 0); |
| 1380 | if (ret < 0 || ret != sizeof(get_packet_info)) { |
| 1381 | ret = -1; |
| 1382 | ERR("Relay didn't receive the whole packet"); |
| 1383 | goto end; |
| 1384 | } |
| 1385 | health_code_update(); |
| 1386 | |
| 1387 | /* From this point on, the error label can be reached. */ |
| 1388 | memset(&reply, 0, sizeof(reply)); |
| 1389 | |
| 1390 | rcu_read_lock(); |
| 1391 | stream = live_find_viewer_stream_by_id(be64toh(get_packet_info.stream_id)); |
| 1392 | if (!stream) { |
| 1393 | goto error; |
| 1394 | } |
| 1395 | assert(stream->ctf_trace); |
| 1396 | |
| 1397 | /* |
| 1398 | * First time we read this stream, we need open the tracefile, we should |
| 1399 | * only arrive here if an index has already been sent to the viewer, so the |
| 1400 | * tracefile must exist, if it does not it is a fatal error. |
| 1401 | */ |
| 1402 | if (stream->read_fd < 0) { |
| 1403 | char fullpath[PATH_MAX]; |
| 1404 | |
| 1405 | if (stream->tracefile_count > 0) { |
| 1406 | ret = snprintf(fullpath, PATH_MAX, "%s/%s_%" PRIu64, stream->path_name, |
| 1407 | stream->channel_name, |
| 1408 | stream->tracefile_count_current); |
| 1409 | } else { |
| 1410 | ret = snprintf(fullpath, PATH_MAX, "%s/%s", stream->path_name, |
| 1411 | stream->channel_name); |
| 1412 | } |
| 1413 | if (ret < 0) { |
| 1414 | goto error; |
| 1415 | } |
| 1416 | ret = open(fullpath, O_RDONLY); |
| 1417 | if (ret < 0) { |
| 1418 | PERROR("Relay opening trace file"); |
| 1419 | goto error; |
| 1420 | } |
| 1421 | stream->read_fd = ret; |
| 1422 | } |
| 1423 | |
| 1424 | if (!stream->ctf_trace->metadata_received || |
| 1425 | stream->ctf_trace->metadata_received > |
| 1426 | stream->ctf_trace->metadata_sent) { |
| 1427 | reply.status = htobe32(VIEWER_GET_PACKET_ERR); |
| 1428 | reply.flags |= LTTNG_VIEWER_FLAG_NEW_METADATA; |
| 1429 | goto send_reply; |
| 1430 | } |
| 1431 | |
| 1432 | len = be32toh(get_packet_info.len); |
| 1433 | data = zmalloc(len); |
| 1434 | if (!data) { |
| 1435 | PERROR("relay data zmalloc"); |
| 1436 | goto error; |
| 1437 | } |
| 1438 | |
| 1439 | ret = lseek(stream->read_fd, be64toh(get_packet_info.offset), SEEK_SET); |
| 1440 | if (ret < 0) { |
| 1441 | /* |
| 1442 | * If the read fd was closed by the streaming side, the |
| 1443 | * abort_flag will be set to 1, otherwise it is an error. |
| 1444 | */ |
| 1445 | if (stream->abort_flag == 0) { |
| 1446 | PERROR("lseek"); |
| 1447 | goto error; |
| 1448 | } |
| 1449 | reply.status = htobe32(VIEWER_GET_PACKET_EOF); |
| 1450 | goto send_reply; |
| 1451 | } |
| 1452 | read_len = lttng_read(stream->read_fd, data, len); |
| 1453 | if (read_len < len) { |
| 1454 | /* |
| 1455 | * If the read fd was closed by the streaming side, the |
| 1456 | * abort_flag will be set to 1, otherwise it is an error. |
| 1457 | */ |
| 1458 | if (stream->abort_flag == 0) { |
| 1459 | PERROR("Relay reading trace file, fd: %d, offset: %" PRIu64, |
| 1460 | stream->read_fd, |
| 1461 | be64toh(get_packet_info.offset)); |
| 1462 | goto error; |
| 1463 | } else { |
| 1464 | reply.status = htobe32(VIEWER_GET_PACKET_EOF); |
| 1465 | goto send_reply; |
| 1466 | } |
| 1467 | } |
| 1468 | reply.status = htobe32(VIEWER_GET_PACKET_OK); |
| 1469 | reply.len = htobe32(len); |
| 1470 | send_data = 1; |
| 1471 | goto send_reply; |
| 1472 | |
| 1473 | error: |
| 1474 | reply.status = htobe32(VIEWER_GET_PACKET_ERR); |
| 1475 | |
| 1476 | send_reply: |
| 1477 | reply.flags = htobe32(reply.flags); |
| 1478 | |
| 1479 | health_code_update(); |
| 1480 | ret = cmd->sock->ops->sendmsg(cmd->sock, &reply, sizeof(reply), 0); |
| 1481 | if (ret < 0) { |
| 1482 | ERR("Relay data header to viewer"); |
| 1483 | goto end_unlock; |
| 1484 | } |
| 1485 | health_code_update(); |
| 1486 | |
| 1487 | if (send_data) { |
| 1488 | health_code_update(); |
| 1489 | ret = cmd->sock->ops->sendmsg(cmd->sock, data, len, 0); |
| 1490 | if (ret < 0) { |
| 1491 | ERR("Relay send data to viewer"); |
| 1492 | goto end_unlock; |
| 1493 | } |
| 1494 | health_code_update(); |
| 1495 | } |
| 1496 | |
| 1497 | DBG("Sent %u bytes for stream %" PRIu64, len, |
| 1498 | be64toh(get_packet_info.stream_id)); |
| 1499 | |
| 1500 | end_unlock: |
| 1501 | free(data); |
| 1502 | rcu_read_unlock(); |
| 1503 | |
| 1504 | end: |
| 1505 | return ret; |
| 1506 | } |
| 1507 | |
| 1508 | /* |
| 1509 | * Send the session's metadata |
| 1510 | * |
| 1511 | * Return 0 on success else a negative value. |
| 1512 | */ |
| 1513 | static |
| 1514 | int viewer_get_metadata(struct relay_command *cmd) |
| 1515 | { |
| 1516 | int ret = 0; |
| 1517 | ssize_t read_len; |
| 1518 | uint64_t len = 0; |
| 1519 | char *data = NULL; |
| 1520 | struct lttng_viewer_get_metadata request; |
| 1521 | struct lttng_viewer_metadata_packet reply; |
| 1522 | struct relay_viewer_stream *stream; |
| 1523 | |
| 1524 | assert(cmd); |
| 1525 | |
| 1526 | DBG("Relay get metadata"); |
| 1527 | |
| 1528 | if (cmd->version_check_done == 0) { |
| 1529 | ERR("Trying to get metadata before version check"); |
| 1530 | ret = -1; |
| 1531 | goto end; |
| 1532 | } |
| 1533 | |
| 1534 | health_code_update(); |
| 1535 | ret = cmd->sock->ops->recvmsg(cmd->sock, &request, |
| 1536 | sizeof(request), 0); |
| 1537 | if (ret < 0 || ret != sizeof(request)) { |
| 1538 | ret = -1; |
| 1539 | ERR("Relay didn't receive the whole packet"); |
| 1540 | goto end; |
| 1541 | } |
| 1542 | health_code_update(); |
| 1543 | |
| 1544 | rcu_read_lock(); |
| 1545 | stream = live_find_viewer_stream_by_id(be64toh(request.stream_id)); |
| 1546 | if (!stream || !stream->metadata_flag) { |
| 1547 | ERR("Invalid metadata stream"); |
| 1548 | goto error; |
| 1549 | } |
| 1550 | assert(stream->ctf_trace); |
| 1551 | assert(stream->ctf_trace->metadata_sent <= |
| 1552 | stream->ctf_trace->metadata_received); |
| 1553 | |
| 1554 | len = stream->ctf_trace->metadata_received - |
| 1555 | stream->ctf_trace->metadata_sent; |
| 1556 | if (len == 0) { |
| 1557 | reply.status = htobe32(VIEWER_NO_NEW_METADATA); |
| 1558 | goto send_reply; |
| 1559 | } |
| 1560 | |
| 1561 | /* first time, we open the metadata file */ |
| 1562 | if (stream->read_fd < 0) { |
| 1563 | char fullpath[PATH_MAX]; |
| 1564 | |
| 1565 | ret = snprintf(fullpath, PATH_MAX, "%s/%s", stream->path_name, |
| 1566 | stream->channel_name); |
| 1567 | if (ret < 0) { |
| 1568 | goto error; |
| 1569 | } |
| 1570 | ret = open(fullpath, O_RDONLY); |
| 1571 | if (ret < 0) { |
| 1572 | PERROR("Relay opening metadata file"); |
| 1573 | goto error; |
| 1574 | } |
| 1575 | stream->read_fd = ret; |
| 1576 | } |
| 1577 | |
| 1578 | reply.len = htobe64(len); |
| 1579 | data = zmalloc(len); |
| 1580 | if (!data) { |
| 1581 | PERROR("viewer metadata zmalloc"); |
| 1582 | goto error; |
| 1583 | } |
| 1584 | |
| 1585 | read_len = lttng_read(stream->read_fd, data, len); |
| 1586 | if (read_len < len) { |
| 1587 | PERROR("Relay reading metadata file"); |
| 1588 | goto error; |
| 1589 | } |
| 1590 | stream->ctf_trace->metadata_sent += read_len; |
| 1591 | reply.status = htobe32(VIEWER_METADATA_OK); |
| 1592 | goto send_reply; |
| 1593 | |
| 1594 | error: |
| 1595 | reply.status = htobe32(VIEWER_METADATA_ERR); |
| 1596 | |
| 1597 | send_reply: |
| 1598 | health_code_update(); |
| 1599 | ret = cmd->sock->ops->sendmsg(cmd->sock, &reply, sizeof(reply), 0); |
| 1600 | if (ret < 0) { |
| 1601 | ERR("Relay data header to viewer"); |
| 1602 | goto end_unlock; |
| 1603 | } |
| 1604 | health_code_update(); |
| 1605 | |
| 1606 | if (len > 0) { |
| 1607 | ret = cmd->sock->ops->sendmsg(cmd->sock, data, len, 0); |
| 1608 | if (ret < 0) { |
| 1609 | ERR("Relay send data to viewer"); |
| 1610 | goto end_unlock; |
| 1611 | } |
| 1612 | } |
| 1613 | |
| 1614 | DBG("Sent %" PRIu64 " bytes of metadata for stream %" PRIu64, len, |
| 1615 | be64toh(request.stream_id)); |
| 1616 | |
| 1617 | DBG("Metadata sent"); |
| 1618 | |
| 1619 | end_unlock: |
| 1620 | free(data); |
| 1621 | rcu_read_unlock(); |
| 1622 | end: |
| 1623 | return ret; |
| 1624 | } |
| 1625 | |
| 1626 | /* |
| 1627 | * live_relay_unknown_command: send -1 if received unknown command |
| 1628 | */ |
| 1629 | static |
| 1630 | void live_relay_unknown_command(struct relay_command *cmd) |
| 1631 | { |
| 1632 | struct lttcomm_relayd_generic_reply reply; |
| 1633 | int ret; |
| 1634 | |
| 1635 | reply.ret_code = htobe32(LTTNG_ERR_UNK); |
| 1636 | ret = cmd->sock->ops->sendmsg(cmd->sock, &reply, |
| 1637 | sizeof(struct lttcomm_relayd_generic_reply), 0); |
| 1638 | if (ret < 0) { |
| 1639 | ERR("Relay sending unknown command"); |
| 1640 | } |
| 1641 | } |
| 1642 | |
| 1643 | /* |
| 1644 | * Process the commands received on the control socket |
| 1645 | */ |
| 1646 | static |
| 1647 | int process_control(struct lttng_viewer_cmd *recv_hdr, |
| 1648 | struct relay_command *cmd, struct lttng_ht *sessions_ht) |
| 1649 | { |
| 1650 | int ret = 0; |
| 1651 | |
| 1652 | switch (be32toh(recv_hdr->cmd)) { |
| 1653 | case VIEWER_CONNECT: |
| 1654 | ret = viewer_connect(cmd); |
| 1655 | break; |
| 1656 | case VIEWER_LIST_SESSIONS: |
| 1657 | ret = viewer_list_sessions(cmd, sessions_ht); |
| 1658 | break; |
| 1659 | case VIEWER_ATTACH_SESSION: |
| 1660 | ret = viewer_attach_session(cmd, sessions_ht); |
| 1661 | break; |
| 1662 | case VIEWER_GET_NEXT_INDEX: |
| 1663 | ret = viewer_get_next_index(cmd, sessions_ht); |
| 1664 | break; |
| 1665 | case VIEWER_GET_PACKET: |
| 1666 | ret = viewer_get_packet(cmd); |
| 1667 | break; |
| 1668 | case VIEWER_GET_METADATA: |
| 1669 | ret = viewer_get_metadata(cmd); |
| 1670 | break; |
| 1671 | default: |
| 1672 | ERR("Received unknown viewer command (%u)", be32toh(recv_hdr->cmd)); |
| 1673 | live_relay_unknown_command(cmd); |
| 1674 | ret = -1; |
| 1675 | goto end; |
| 1676 | } |
| 1677 | |
| 1678 | end: |
| 1679 | return ret; |
| 1680 | } |
| 1681 | |
| 1682 | static |
| 1683 | void cleanup_poll_connection(struct lttng_poll_event *events, int pollfd) |
| 1684 | { |
| 1685 | int ret; |
| 1686 | |
| 1687 | assert(events); |
| 1688 | |
| 1689 | lttng_poll_del(events, pollfd); |
| 1690 | |
| 1691 | ret = close(pollfd); |
| 1692 | if (ret < 0) { |
| 1693 | ERR("Closing pollfd %d", pollfd); |
| 1694 | } |
| 1695 | } |
| 1696 | |
| 1697 | /* |
| 1698 | * Create and add connection to the given hash table. |
| 1699 | * |
| 1700 | * Return poll add value or else -1 on error. |
| 1701 | */ |
| 1702 | static |
| 1703 | int add_connection(int fd, struct lttng_poll_event *events, |
| 1704 | struct lttng_ht *relay_connections_ht) |
| 1705 | { |
| 1706 | int ret; |
| 1707 | struct relay_command *relay_connection; |
| 1708 | |
| 1709 | assert(events); |
| 1710 | assert(relay_connections_ht); |
| 1711 | |
| 1712 | relay_connection = zmalloc(sizeof(struct relay_command)); |
| 1713 | if (relay_connection == NULL) { |
| 1714 | PERROR("Relay command zmalloc"); |
| 1715 | goto error; |
| 1716 | } |
| 1717 | |
| 1718 | ret = lttng_read(fd, relay_connection, sizeof(*relay_connection)); |
| 1719 | if (ret < sizeof(*relay_connection)) { |
| 1720 | PERROR("read relay cmd pipe"); |
| 1721 | goto error_read; |
| 1722 | } |
| 1723 | |
| 1724 | lttng_ht_node_init_ulong(&relay_connection->sock_n, |
| 1725 | (unsigned long) relay_connection->sock->fd); |
| 1726 | rcu_read_lock(); |
| 1727 | lttng_ht_add_unique_ulong(relay_connections_ht, |
| 1728 | &relay_connection->sock_n); |
| 1729 | rcu_read_unlock(); |
| 1730 | |
| 1731 | return lttng_poll_add(events, relay_connection->sock->fd, |
| 1732 | LPOLLIN | LPOLLRDHUP); |
| 1733 | |
| 1734 | error_read: |
| 1735 | free(relay_connection); |
| 1736 | error: |
| 1737 | return -1; |
| 1738 | } |
| 1739 | |
| 1740 | static |
| 1741 | void deferred_free_connection(struct rcu_head *head) |
| 1742 | { |
| 1743 | struct relay_command *relay_connection = |
| 1744 | caa_container_of(head, struct relay_command, rcu_node); |
| 1745 | |
| 1746 | if (relay_connection->session && |
| 1747 | relay_connection->session->viewer_attached > 0) { |
| 1748 | relay_connection->session->viewer_attached--; |
| 1749 | } |
| 1750 | lttcomm_destroy_sock(relay_connection->sock); |
| 1751 | free(relay_connection); |
| 1752 | } |
| 1753 | |
| 1754 | /* |
| 1755 | * Delete all streams for a specific session ID. |
| 1756 | */ |
| 1757 | static |
| 1758 | void viewer_del_streams(uint64_t session_id) |
| 1759 | { |
| 1760 | struct relay_viewer_stream *stream; |
| 1761 | struct lttng_ht_iter iter; |
| 1762 | |
| 1763 | rcu_read_lock(); |
| 1764 | cds_lfht_for_each_entry(viewer_streams_ht->ht, &iter.iter, stream, |
| 1765 | stream_n.node) { |
| 1766 | health_code_update(); |
| 1767 | |
| 1768 | if (stream->session_id != session_id) { |
| 1769 | continue; |
| 1770 | } |
| 1771 | |
| 1772 | delete_viewer_stream(stream); |
| 1773 | assert(stream->ctf_trace); |
| 1774 | |
| 1775 | if (stream->metadata_flag) { |
| 1776 | /* |
| 1777 | * The metadata viewer stream is destroyed once the refcount on the |
| 1778 | * ctf trace goes to 0 in the destroy stream function thus there is |
| 1779 | * no explicit call to that function here. |
| 1780 | */ |
| 1781 | stream->ctf_trace->metadata_sent = 0; |
| 1782 | stream->ctf_trace->viewer_metadata_stream = NULL; |
| 1783 | } else { |
| 1784 | destroy_viewer_stream(stream); |
| 1785 | } |
| 1786 | } |
| 1787 | rcu_read_unlock(); |
| 1788 | } |
| 1789 | |
| 1790 | /* |
| 1791 | * Delete and free a connection. |
| 1792 | * |
| 1793 | * RCU read side lock MUST be acquired. |
| 1794 | */ |
| 1795 | static |
| 1796 | void del_connection(struct lttng_ht *relay_connections_ht, |
| 1797 | struct lttng_ht_iter *iter, struct relay_command *relay_connection) |
| 1798 | { |
| 1799 | int ret; |
| 1800 | |
| 1801 | assert(relay_connections_ht); |
| 1802 | assert(iter); |
| 1803 | assert(relay_connection); |
| 1804 | |
| 1805 | DBG("Cleaning connection of session ID %" PRIu64, |
| 1806 | relay_connection->session_id); |
| 1807 | |
| 1808 | ret = lttng_ht_del(relay_connections_ht, iter); |
| 1809 | assert(!ret); |
| 1810 | |
| 1811 | viewer_del_streams(relay_connection->session_id); |
| 1812 | |
| 1813 | call_rcu(&relay_connection->rcu_node, deferred_free_connection); |
| 1814 | } |
| 1815 | |
| 1816 | /* |
| 1817 | * This thread does the actual work |
| 1818 | */ |
| 1819 | static |
| 1820 | void *thread_worker(void *data) |
| 1821 | { |
| 1822 | int ret, err = -1; |
| 1823 | uint32_t nb_fd; |
| 1824 | struct relay_command *relay_connection; |
| 1825 | struct lttng_poll_event events; |
| 1826 | struct lttng_ht *relay_connections_ht; |
| 1827 | struct lttng_ht_node_ulong *node; |
| 1828 | struct lttng_ht_iter iter; |
| 1829 | struct lttng_viewer_cmd recv_hdr; |
| 1830 | struct relay_local_data *relay_ctx = (struct relay_local_data *) data; |
| 1831 | struct lttng_ht *sessions_ht = relay_ctx->sessions_ht; |
| 1832 | |
| 1833 | DBG("[thread] Live viewer relay worker started"); |
| 1834 | |
| 1835 | rcu_register_thread(); |
| 1836 | |
| 1837 | health_register(health_relayd, HEALTH_RELAYD_TYPE_LIVE_WORKER); |
| 1838 | |
| 1839 | if (testpoint(relayd_thread_live_worker)) { |
| 1840 | goto error_testpoint; |
| 1841 | } |
| 1842 | |
| 1843 | /* table of connections indexed on socket */ |
| 1844 | relay_connections_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
| 1845 | if (!relay_connections_ht) { |
| 1846 | goto relay_connections_ht_error; |
| 1847 | } |
| 1848 | |
| 1849 | ret = create_thread_poll_set(&events, 2); |
| 1850 | if (ret < 0) { |
| 1851 | goto error_poll_create; |
| 1852 | } |
| 1853 | |
| 1854 | ret = lttng_poll_add(&events, live_relay_cmd_pipe[0], LPOLLIN | LPOLLRDHUP); |
| 1855 | if (ret < 0) { |
| 1856 | goto error; |
| 1857 | } |
| 1858 | |
| 1859 | restart: |
| 1860 | while (1) { |
| 1861 | int i; |
| 1862 | |
| 1863 | health_code_update(); |
| 1864 | |
| 1865 | /* Infinite blocking call, waiting for transmission */ |
| 1866 | DBG3("Relayd live viewer worker thread polling..."); |
| 1867 | health_poll_entry(); |
| 1868 | ret = lttng_poll_wait(&events, -1); |
| 1869 | health_poll_exit(); |
| 1870 | if (ret < 0) { |
| 1871 | /* |
| 1872 | * Restart interrupted system call. |
| 1873 | */ |
| 1874 | if (errno == EINTR) { |
| 1875 | goto restart; |
| 1876 | } |
| 1877 | goto error; |
| 1878 | } |
| 1879 | |
| 1880 | nb_fd = ret; |
| 1881 | |
| 1882 | /* |
| 1883 | * Process control. The control connection is prioritised so we don't |
| 1884 | * starve it with high throughput tracing data on the data |
| 1885 | * connection. |
| 1886 | */ |
| 1887 | for (i = 0; i < nb_fd; i++) { |
| 1888 | /* Fetch once the poll data */ |
| 1889 | uint32_t revents = LTTNG_POLL_GETEV(&events, i); |
| 1890 | int pollfd = LTTNG_POLL_GETFD(&events, i); |
| 1891 | |
| 1892 | health_code_update(); |
| 1893 | |
| 1894 | /* Thread quit pipe has been closed. Killing thread. */ |
| 1895 | ret = check_thread_quit_pipe(pollfd, revents); |
| 1896 | if (ret) { |
| 1897 | err = 0; |
| 1898 | goto exit; |
| 1899 | } |
| 1900 | |
| 1901 | /* Inspect the relay cmd pipe for new connection */ |
| 1902 | if (pollfd == live_relay_cmd_pipe[0]) { |
| 1903 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { |
| 1904 | ERR("Relay live pipe error"); |
| 1905 | goto error; |
| 1906 | } else if (revents & LPOLLIN) { |
| 1907 | DBG("Relay live viewer command received"); |
| 1908 | ret = add_connection(live_relay_cmd_pipe[0], |
| 1909 | &events, relay_connections_ht); |
| 1910 | if (ret < 0) { |
| 1911 | goto error; |
| 1912 | } |
| 1913 | } |
| 1914 | } else if (revents) { |
| 1915 | rcu_read_lock(); |
| 1916 | lttng_ht_lookup(relay_connections_ht, |
| 1917 | (void *)((unsigned long) pollfd), &iter); |
| 1918 | node = lttng_ht_iter_get_node_ulong(&iter); |
| 1919 | if (node == NULL) { |
| 1920 | DBG2("Relay viewer sock %d not found", pollfd); |
| 1921 | rcu_read_unlock(); |
| 1922 | goto error; |
| 1923 | } |
| 1924 | relay_connection = caa_container_of(node, struct relay_command, |
| 1925 | sock_n); |
| 1926 | |
| 1927 | if (revents & (LPOLLERR)) { |
| 1928 | cleanup_poll_connection(&events, pollfd); |
| 1929 | del_connection(relay_connections_ht, &iter, |
| 1930 | relay_connection); |
| 1931 | } else if (revents & (LPOLLHUP | LPOLLRDHUP)) { |
| 1932 | DBG("Viewer socket %d hung up", pollfd); |
| 1933 | cleanup_poll_connection(&events, pollfd); |
| 1934 | del_connection(relay_connections_ht, &iter, |
| 1935 | relay_connection); |
| 1936 | } else if (revents & LPOLLIN) { |
| 1937 | ret = relay_connection->sock->ops->recvmsg( |
| 1938 | relay_connection->sock, &recv_hdr, |
| 1939 | sizeof(struct lttng_viewer_cmd), |
| 1940 | 0); |
| 1941 | /* connection closed */ |
| 1942 | if (ret <= 0) { |
| 1943 | cleanup_poll_connection(&events, pollfd); |
| 1944 | del_connection(relay_connections_ht, &iter, |
| 1945 | relay_connection); |
| 1946 | DBG("Viewer control connection closed with %d", |
| 1947 | pollfd); |
| 1948 | } else { |
| 1949 | if (relay_connection->session) { |
| 1950 | DBG2("Relay viewer worker receiving data for " |
| 1951 | "session: %" PRIu64, |
| 1952 | relay_connection->session->id); |
| 1953 | } |
| 1954 | ret = process_control(&recv_hdr, relay_connection, |
| 1955 | sessions_ht); |
| 1956 | if (ret < 0) { |
| 1957 | /* Clear the session on error. */ |
| 1958 | cleanup_poll_connection(&events, pollfd); |
| 1959 | del_connection(relay_connections_ht, &iter, |
| 1960 | relay_connection); |
| 1961 | DBG("Viewer connection closed with %d", pollfd); |
| 1962 | } |
| 1963 | } |
| 1964 | } |
| 1965 | rcu_read_unlock(); |
| 1966 | } |
| 1967 | } |
| 1968 | } |
| 1969 | |
| 1970 | exit: |
| 1971 | error: |
| 1972 | lttng_poll_clean(&events); |
| 1973 | |
| 1974 | /* empty the hash table and free the memory */ |
| 1975 | rcu_read_lock(); |
| 1976 | cds_lfht_for_each_entry(relay_connections_ht->ht, &iter.iter, node, node) { |
| 1977 | health_code_update(); |
| 1978 | |
| 1979 | node = lttng_ht_iter_get_node_ulong(&iter); |
| 1980 | if (!node) { |
| 1981 | continue; |
| 1982 | } |
| 1983 | |
| 1984 | relay_connection = caa_container_of(node, struct relay_command, |
| 1985 | sock_n); |
| 1986 | del_connection(relay_connections_ht, &iter, relay_connection); |
| 1987 | } |
| 1988 | rcu_read_unlock(); |
| 1989 | error_poll_create: |
| 1990 | lttng_ht_destroy(relay_connections_ht); |
| 1991 | relay_connections_ht_error: |
| 1992 | /* Close relay cmd pipes */ |
| 1993 | utils_close_pipe(live_relay_cmd_pipe); |
| 1994 | if (err) { |
| 1995 | DBG("Viewer worker thread exited with error"); |
| 1996 | } |
| 1997 | DBG("Viewer worker thread cleanup complete"); |
| 1998 | error_testpoint: |
| 1999 | if (err) { |
| 2000 | health_error(); |
| 2001 | ERR("Health error occurred in %s", __func__); |
| 2002 | } |
| 2003 | health_unregister(health_relayd); |
| 2004 | stop_threads(); |
| 2005 | rcu_unregister_thread(); |
| 2006 | return NULL; |
| 2007 | } |
| 2008 | |
| 2009 | /* |
| 2010 | * Create the relay command pipe to wake thread_manage_apps. |
| 2011 | * Closed in cleanup(). |
| 2012 | */ |
| 2013 | static int create_relay_cmd_pipe(void) |
| 2014 | { |
| 2015 | int ret; |
| 2016 | |
| 2017 | ret = utils_create_pipe_cloexec(live_relay_cmd_pipe); |
| 2018 | |
| 2019 | return ret; |
| 2020 | } |
| 2021 | |
| 2022 | void live_stop_threads(void) |
| 2023 | { |
| 2024 | int ret; |
| 2025 | void *status; |
| 2026 | |
| 2027 | stop_threads(); |
| 2028 | |
| 2029 | ret = pthread_join(live_listener_thread, &status); |
| 2030 | if (ret != 0) { |
| 2031 | PERROR("pthread_join live listener"); |
| 2032 | goto error; /* join error, exit without cleanup */ |
| 2033 | } |
| 2034 | |
| 2035 | ret = pthread_join(live_worker_thread, &status); |
| 2036 | if (ret != 0) { |
| 2037 | PERROR("pthread_join live worker"); |
| 2038 | goto error; /* join error, exit without cleanup */ |
| 2039 | } |
| 2040 | |
| 2041 | ret = pthread_join(live_dispatcher_thread, &status); |
| 2042 | if (ret != 0) { |
| 2043 | PERROR("pthread_join live dispatcher"); |
| 2044 | goto error; /* join error, exit without cleanup */ |
| 2045 | } |
| 2046 | |
| 2047 | cleanup(); |
| 2048 | |
| 2049 | error: |
| 2050 | return; |
| 2051 | } |
| 2052 | |
| 2053 | /* |
| 2054 | * main |
| 2055 | */ |
| 2056 | int live_start_threads(struct lttng_uri *uri, |
| 2057 | struct relay_local_data *relay_ctx) |
| 2058 | { |
| 2059 | int ret = 0; |
| 2060 | void *status; |
| 2061 | int is_root; |
| 2062 | |
| 2063 | assert(uri); |
| 2064 | live_uri = uri; |
| 2065 | |
| 2066 | /* Check if daemon is UID = 0 */ |
| 2067 | is_root = !getuid(); |
| 2068 | |
| 2069 | if (!is_root) { |
| 2070 | if (live_uri->port < 1024) { |
| 2071 | ERR("Need to be root to use ports < 1024"); |
| 2072 | ret = -1; |
| 2073 | goto exit; |
| 2074 | } |
| 2075 | } |
| 2076 | |
| 2077 | /* Setup the thread apps communication pipe. */ |
| 2078 | if ((ret = create_relay_cmd_pipe()) < 0) { |
| 2079 | goto exit; |
| 2080 | } |
| 2081 | |
| 2082 | /* Init relay command queue. */ |
| 2083 | cds_wfq_init(&viewer_cmd_queue.queue); |
| 2084 | |
| 2085 | /* Set up max poll set size */ |
| 2086 | lttng_poll_set_max_size(); |
| 2087 | |
| 2088 | /* Setup the dispatcher thread */ |
| 2089 | ret = pthread_create(&live_dispatcher_thread, NULL, |
| 2090 | thread_dispatcher, (void *) NULL); |
| 2091 | if (ret != 0) { |
| 2092 | PERROR("pthread_create viewer dispatcher"); |
| 2093 | goto exit_dispatcher; |
| 2094 | } |
| 2095 | |
| 2096 | /* Setup the worker thread */ |
| 2097 | ret = pthread_create(&live_worker_thread, NULL, |
| 2098 | thread_worker, relay_ctx); |
| 2099 | if (ret != 0) { |
| 2100 | PERROR("pthread_create viewer worker"); |
| 2101 | goto exit_worker; |
| 2102 | } |
| 2103 | |
| 2104 | /* Setup the listener thread */ |
| 2105 | ret = pthread_create(&live_listener_thread, NULL, |
| 2106 | thread_listener, (void *) NULL); |
| 2107 | if (ret != 0) { |
| 2108 | PERROR("pthread_create viewer listener"); |
| 2109 | goto exit_listener; |
| 2110 | } |
| 2111 | |
| 2112 | ret = 0; |
| 2113 | goto end; |
| 2114 | |
| 2115 | exit_listener: |
| 2116 | ret = pthread_join(live_listener_thread, &status); |
| 2117 | if (ret != 0) { |
| 2118 | PERROR("pthread_join live listener"); |
| 2119 | goto error; /* join error, exit without cleanup */ |
| 2120 | } |
| 2121 | |
| 2122 | exit_worker: |
| 2123 | ret = pthread_join(live_worker_thread, &status); |
| 2124 | if (ret != 0) { |
| 2125 | PERROR("pthread_join live worker"); |
| 2126 | goto error; /* join error, exit without cleanup */ |
| 2127 | } |
| 2128 | |
| 2129 | exit_dispatcher: |
| 2130 | ret = pthread_join(live_dispatcher_thread, &status); |
| 2131 | if (ret != 0) { |
| 2132 | PERROR("pthread_join live dispatcher"); |
| 2133 | goto error; /* join error, exit without cleanup */ |
| 2134 | } |
| 2135 | |
| 2136 | exit: |
| 2137 | cleanup(); |
| 2138 | |
| 2139 | end: |
| 2140 | error: |
| 2141 | return ret; |
| 2142 | } |