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d3e2ba59 JD |
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 | ||
60 | static struct lttng_uri *live_uri; | |
61 | ||
62 | /* | |
63 | * Quit pipe for all threads. This permits a single cancellation point | |
64 | * for all threads when receiving an event on the pipe. | |
65 | */ | |
66 | static int live_thread_quit_pipe[2] = { -1, -1 }; | |
67 | ||
68 | /* | |
69 | * This pipe is used to inform the worker thread that a command is queued and | |
70 | * ready to be processed. | |
71 | */ | |
72 | static int live_relay_cmd_pipe[2] = { -1, -1 }; | |
73 | ||
74 | /* Shared between threads */ | |
75 | static int live_dispatch_thread_exit; | |
76 | ||
77 | static pthread_t live_listener_thread; | |
78 | static pthread_t live_dispatcher_thread; | |
79 | static pthread_t live_worker_thread; | |
80 | ||
81 | /* | |
82 | * Relay command queue. | |
83 | * | |
84 | * The live_thread_listener and live_thread_dispatcher communicate with this | |
85 | * queue. | |
86 | */ | |
87 | static struct relay_cmd_queue viewer_cmd_queue; | |
88 | ||
89 | static uint64_t last_relay_viewer_session_id; | |
90 | ||
91 | /* | |
92 | * Cleanup the daemon | |
93 | */ | |
94 | static | |
95 | void cleanup(void) | |
96 | { | |
97 | DBG("Cleaning up"); | |
98 | ||
d3e2ba59 JD |
99 | free(live_uri); |
100 | } | |
101 | ||
102 | /* | |
103 | * Write to writable pipe used to notify a thread. | |
104 | */ | |
105 | static | |
106 | int notify_thread_pipe(int wpipe) | |
107 | { | |
108 | int ret; | |
109 | ||
110 | do { | |
111 | ret = write(wpipe, "!", 1); | |
112 | } while (ret < 0 && errno == EINTR); | |
113 | if (ret < 0 || ret != 1) { | |
114 | PERROR("write poll pipe"); | |
115 | } | |
116 | ||
117 | return ret; | |
118 | } | |
119 | ||
120 | /* | |
121 | * Stop all threads by closing the thread quit pipe. | |
122 | */ | |
123 | static | |
124 | void stop_threads(void) | |
125 | { | |
126 | int ret; | |
127 | ||
128 | /* Stopping all threads */ | |
129 | DBG("Terminating all live threads"); | |
130 | ret = notify_thread_pipe(live_thread_quit_pipe[1]); | |
131 | if (ret < 0) { | |
132 | ERR("write error on thread quit pipe"); | |
133 | } | |
134 | ||
135 | /* Dispatch thread */ | |
136 | CMM_STORE_SHARED(live_dispatch_thread_exit, 1); | |
137 | futex_nto1_wake(&viewer_cmd_queue.futex); | |
138 | } | |
139 | ||
d3e2ba59 JD |
140 | /* |
141 | * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set. | |
142 | */ | |
143 | static | |
144 | int create_thread_poll_set(struct lttng_poll_event *events, int size) | |
145 | { | |
146 | int ret; | |
147 | ||
148 | if (events == NULL || size == 0) { | |
149 | ret = -1; | |
150 | goto error; | |
151 | } | |
152 | ||
153 | ret = lttng_poll_create(events, size, LTTNG_CLOEXEC); | |
154 | if (ret < 0) { | |
155 | goto error; | |
156 | } | |
157 | ||
158 | /* Add quit pipe */ | |
159 | ret = lttng_poll_add(events, live_thread_quit_pipe[0], LPOLLIN); | |
160 | if (ret < 0) { | |
161 | goto error; | |
162 | } | |
163 | ||
164 | return 0; | |
165 | ||
166 | error: | |
167 | return ret; | |
168 | } | |
169 | ||
170 | /* | |
171 | * Check if the thread quit pipe was triggered. | |
172 | * | |
173 | * Return 1 if it was triggered else 0; | |
174 | */ | |
175 | static | |
176 | int check_thread_quit_pipe(int fd, uint32_t events) | |
177 | { | |
178 | if (fd == live_thread_quit_pipe[0] && (events & LPOLLIN)) { | |
179 | return 1; | |
180 | } | |
181 | ||
182 | return 0; | |
183 | } | |
184 | ||
185 | /* | |
186 | * Create and init socket from uri. | |
187 | */ | |
188 | static | |
189 | struct lttcomm_sock *init_socket(struct lttng_uri *uri) | |
190 | { | |
191 | int ret; | |
192 | struct lttcomm_sock *sock = NULL; | |
193 | ||
194 | sock = lttcomm_alloc_sock_from_uri(uri); | |
195 | if (sock == NULL) { | |
196 | ERR("Allocating socket"); | |
197 | goto error; | |
198 | } | |
199 | ||
200 | ret = lttcomm_create_sock(sock); | |
201 | if (ret < 0) { | |
202 | goto error; | |
203 | } | |
204 | DBG("Listening on sock %d for live", sock->fd); | |
205 | ||
206 | ret = sock->ops->bind(sock); | |
207 | if (ret < 0) { | |
208 | goto error; | |
209 | } | |
210 | ||
211 | ret = sock->ops->listen(sock, -1); | |
212 | if (ret < 0) { | |
213 | goto error; | |
214 | ||
215 | } | |
216 | ||
217 | return sock; | |
218 | ||
219 | error: | |
220 | if (sock) { | |
221 | lttcomm_destroy_sock(sock); | |
222 | } | |
223 | return NULL; | |
224 | } | |
225 | ||
226 | /* | |
227 | * This thread manages the listening for new connections on the network | |
228 | */ | |
229 | static | |
230 | void *thread_listener(void *data) | |
231 | { | |
232 | int i, ret, pollfd, err = -1; | |
233 | int val = 1; | |
234 | uint32_t revents, nb_fd; | |
235 | struct lttng_poll_event events; | |
236 | struct lttcomm_sock *live_control_sock; | |
237 | ||
238 | DBG("[thread] Relay live listener started"); | |
239 | ||
240 | live_control_sock = init_socket(live_uri); | |
241 | if (!live_control_sock) { | |
242 | goto error_sock_control; | |
243 | } | |
244 | ||
245 | /* | |
246 | * Pass 3 as size here for the thread quit pipe, control and data socket. | |
247 | */ | |
248 | ret = create_thread_poll_set(&events, 2); | |
249 | if (ret < 0) { | |
250 | goto error_create_poll; | |
251 | } | |
252 | ||
253 | /* Add the control socket */ | |
254 | ret = lttng_poll_add(&events, live_control_sock->fd, LPOLLIN | LPOLLRDHUP); | |
255 | if (ret < 0) { | |
256 | goto error_poll_add; | |
257 | } | |
258 | ||
259 | while (1) { | |
260 | DBG("Listener accepting live viewers connections"); | |
261 | ||
262 | restart: | |
263 | ret = lttng_poll_wait(&events, -1); | |
264 | if (ret < 0) { | |
265 | /* | |
266 | * Restart interrupted system call. | |
267 | */ | |
268 | if (errno == EINTR) { | |
269 | goto restart; | |
270 | } | |
271 | goto error; | |
272 | } | |
273 | nb_fd = ret; | |
274 | ||
275 | DBG("Relay new viewer connection received"); | |
276 | for (i = 0; i < nb_fd; i++) { | |
277 | /* Fetch once the poll data */ | |
278 | revents = LTTNG_POLL_GETEV(&events, i); | |
279 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
280 | ||
281 | /* Thread quit pipe has been closed. Killing thread. */ | |
282 | ret = check_thread_quit_pipe(pollfd, revents); | |
283 | if (ret) { | |
284 | err = 0; | |
285 | goto exit; | |
286 | } | |
287 | ||
288 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
289 | ERR("socket poll error"); | |
290 | goto error; | |
291 | } else if (revents & LPOLLIN) { | |
292 | /* | |
293 | * Get allocated in this thread, enqueued to a global queue, | |
294 | * dequeued and freed in the worker thread. | |
295 | */ | |
296 | struct relay_command *relay_cmd; | |
297 | struct lttcomm_sock *newsock; | |
298 | ||
299 | relay_cmd = zmalloc(sizeof(*relay_cmd)); | |
300 | if (!relay_cmd) { | |
301 | PERROR("relay command zmalloc"); | |
302 | goto error; | |
303 | } | |
304 | ||
305 | assert(pollfd == live_control_sock->fd); | |
306 | newsock = live_control_sock->ops->accept(live_control_sock); | |
307 | if (!newsock) { | |
308 | PERROR("accepting control sock"); | |
309 | free(relay_cmd); | |
310 | goto error; | |
311 | } | |
312 | DBG("Relay viewer connection accepted socket %d", newsock->fd); | |
313 | ret = setsockopt(newsock->fd, SOL_SOCKET, SO_REUSEADDR, &val, | |
314 | sizeof(int)); | |
315 | if (ret < 0) { | |
316 | PERROR("setsockopt inet"); | |
317 | lttcomm_destroy_sock(newsock); | |
318 | free(relay_cmd); | |
319 | goto error; | |
320 | } | |
321 | relay_cmd->sock = newsock; | |
322 | ||
323 | /* | |
324 | * Lock free enqueue the request. | |
325 | */ | |
326 | cds_wfq_enqueue(&viewer_cmd_queue.queue, &relay_cmd->node); | |
327 | ||
328 | /* | |
329 | * Wake the dispatch queue futex. Implicit memory | |
330 | * barrier with the exchange in cds_wfq_enqueue. | |
331 | */ | |
332 | futex_nto1_wake(&viewer_cmd_queue.futex); | |
333 | } | |
334 | } | |
335 | } | |
336 | ||
337 | exit: | |
338 | error: | |
339 | error_poll_add: | |
340 | lttng_poll_clean(&events); | |
341 | error_create_poll: | |
342 | if (live_control_sock->fd >= 0) { | |
343 | ret = live_control_sock->ops->close(live_control_sock); | |
344 | if (ret) { | |
345 | PERROR("close"); | |
346 | } | |
347 | } | |
348 | lttcomm_destroy_sock(live_control_sock); | |
349 | error_sock_control: | |
350 | if (err) { | |
351 | DBG("Live viewer listener thread exited with error"); | |
352 | } | |
353 | DBG("Live viewer listener thread cleanup complete"); | |
354 | stop_threads(); | |
355 | return NULL; | |
356 | } | |
357 | ||
358 | /* | |
359 | * This thread manages the dispatching of the requests to worker threads | |
360 | */ | |
361 | static | |
362 | void *thread_dispatcher(void *data) | |
363 | { | |
364 | int ret; | |
365 | struct cds_wfq_node *node; | |
366 | struct relay_command *relay_cmd = NULL; | |
367 | ||
368 | DBG("[thread] Live viewer relay dispatcher started"); | |
369 | ||
370 | while (!CMM_LOAD_SHARED(live_dispatch_thread_exit)) { | |
371 | /* Atomically prepare the queue futex */ | |
372 | futex_nto1_prepare(&viewer_cmd_queue.futex); | |
373 | ||
374 | do { | |
375 | /* Dequeue commands */ | |
376 | node = cds_wfq_dequeue_blocking(&viewer_cmd_queue.queue); | |
377 | if (node == NULL) { | |
378 | DBG("Woken up but nothing in the live-viewer " | |
379 | "relay command queue"); | |
380 | /* Continue thread execution */ | |
381 | break; | |
382 | } | |
383 | ||
384 | relay_cmd = caa_container_of(node, struct relay_command, node); | |
385 | DBG("Dispatching viewer request waiting on sock %d", | |
386 | relay_cmd->sock->fd); | |
387 | ||
388 | /* | |
389 | * Inform worker thread of the new request. This call is blocking | |
390 | * so we can be assured that the data will be read at some point in | |
391 | * time or wait to the end of the world :) | |
392 | */ | |
393 | do { | |
394 | ret = write(live_relay_cmd_pipe[1], relay_cmd, | |
395 | sizeof(*relay_cmd)); | |
396 | } while (ret < 0 && errno == EINTR); | |
397 | free(relay_cmd); | |
398 | if (ret < 0 || ret != sizeof(struct relay_command)) { | |
399 | PERROR("write cmd pipe"); | |
400 | goto error; | |
401 | } | |
402 | } while (node != NULL); | |
403 | ||
404 | /* Futex wait on queue. Blocking call on futex() */ | |
405 | futex_nto1_wait(&viewer_cmd_queue.futex); | |
406 | } | |
407 | ||
408 | error: | |
409 | DBG("Live viewer dispatch thread dying"); | |
410 | stop_threads(); | |
411 | return NULL; | |
412 | } | |
413 | ||
414 | /* | |
415 | * Establish connection with the viewer and check the versions. | |
416 | * | |
417 | * Return 0 on success or else negative value. | |
418 | */ | |
419 | static | |
420 | int viewer_connect(struct relay_command *cmd) | |
421 | { | |
422 | int ret; | |
423 | struct lttng_viewer_connect reply, msg; | |
424 | ||
425 | assert(cmd); | |
426 | ||
427 | cmd->version_check_done = 1; | |
428 | ||
429 | /* Get version from the other side. */ | |
430 | ret = cmd->sock->ops->recvmsg(cmd->sock, &msg, sizeof(msg), 0); | |
431 | if (ret < 0 || ret != sizeof(msg)) { | |
432 | if (ret == 0) { | |
433 | /* Orderly shutdown. Not necessary to print an error. */ | |
434 | DBG("Socket %d did an orderly shutdown", cmd->sock->fd); | |
435 | } else { | |
436 | ERR("Relay failed to receive the version values."); | |
437 | } | |
438 | ret = -1; | |
439 | goto end; | |
440 | } | |
441 | ||
442 | reply.major = RELAYD_VERSION_COMM_MAJOR; | |
443 | reply.minor = RELAYD_VERSION_COMM_MINOR; | |
444 | ||
445 | /* Major versions must be the same */ | |
446 | if (reply.major != be32toh(msg.major)) { | |
447 | DBG("Incompatible major versions (%u vs %u)", reply.major, | |
448 | be32toh(msg.major)); | |
449 | ret = 0; | |
450 | goto end; | |
451 | } | |
452 | ||
453 | cmd->major = reply.major; | |
454 | /* We adapt to the lowest compatible version */ | |
455 | if (reply.minor <= be32toh(msg.minor)) { | |
456 | cmd->minor = reply.minor; | |
457 | } else { | |
458 | cmd->minor = be32toh(msg.minor); | |
459 | } | |
460 | ||
461 | if (be32toh(msg.type) == VIEWER_CLIENT_COMMAND) { | |
462 | cmd->type = RELAY_VIEWER_COMMAND; | |
463 | } else if (be32toh(msg.type) == VIEWER_CLIENT_NOTIFICATION) { | |
464 | cmd->type = RELAY_VIEWER_NOTIFICATION; | |
465 | } else { | |
466 | ERR("Unknown connection type : %u", be32toh(msg.type)); | |
467 | ret = -1; | |
468 | goto end; | |
469 | } | |
470 | ||
471 | reply.major = htobe32(reply.major); | |
472 | reply.minor = htobe32(reply.minor); | |
473 | if (cmd->type == RELAY_VIEWER_COMMAND) { | |
474 | reply.viewer_session_id = htobe64(++last_relay_viewer_session_id); | |
475 | } | |
476 | ret = cmd->sock->ops->sendmsg(cmd->sock, &reply, | |
477 | sizeof(struct lttng_viewer_connect), 0); | |
478 | if (ret < 0) { | |
479 | ERR("Relay sending version"); | |
480 | } | |
481 | ||
482 | DBG("Version check done using protocol %u.%u", cmd->major, cmd->minor); | |
483 | ret = 0; | |
484 | ||
485 | end: | |
486 | return ret; | |
487 | } | |
488 | ||
489 | /* | |
490 | * Send the viewer the list of current sessions. | |
491 | * | |
492 | * Return 0 on success or else a negative value. | |
493 | */ | |
494 | static | |
495 | int viewer_list_sessions(struct relay_command *cmd, | |
496 | struct lttng_ht *sessions_ht) | |
497 | { | |
498 | int ret; | |
499 | struct lttng_viewer_list_sessions session_list; | |
500 | unsigned long count; | |
501 | long approx_before, approx_after; | |
502 | struct lttng_ht_node_ulong *node; | |
503 | struct lttng_ht_iter iter; | |
504 | struct lttng_viewer_session send_session; | |
505 | struct relay_session *session; | |
506 | ||
507 | DBG("List sessions received"); | |
508 | ||
509 | if (cmd->version_check_done == 0) { | |
510 | ERR("Trying to list sessions before version check"); | |
511 | ret = -1; | |
512 | goto end_no_session; | |
513 | } | |
514 | ||
515 | rcu_read_lock(); | |
516 | cds_lfht_count_nodes(sessions_ht->ht, &approx_before, &count, &approx_after); | |
517 | session_list.sessions_count = htobe32(count); | |
518 | ||
519 | ret = cmd->sock->ops->sendmsg(cmd->sock, &session_list, | |
520 | sizeof(session_list), 0); | |
521 | if (ret < 0) { | |
522 | ERR("Relay sending sessions list"); | |
523 | goto end_unlock; | |
524 | } | |
525 | ||
526 | cds_lfht_for_each_entry(sessions_ht->ht, &iter.iter, node, node) { | |
527 | node = lttng_ht_iter_get_node_ulong(&iter); | |
528 | if (!node) { | |
529 | goto end_unlock; | |
530 | } | |
531 | session = caa_container_of(node, struct relay_session, session_n); | |
532 | ||
533 | strncpy(send_session.session_name, session->session_name, | |
534 | sizeof(send_session.session_name)); | |
535 | strncpy(send_session.hostname, session->hostname, | |
536 | sizeof(send_session.hostname)); | |
537 | send_session.id = htobe64(session->id); | |
538 | send_session.live_timer = htobe32(session->live_timer); | |
539 | send_session.clients = htobe32(session->viewer_attached); | |
540 | ||
541 | ret = cmd->sock->ops->sendmsg(cmd->sock, &send_session, | |
542 | sizeof(send_session), 0); | |
543 | if (ret < 0) { | |
544 | ERR("Relay sending session info"); | |
545 | goto end_unlock; | |
546 | } | |
547 | } | |
548 | rcu_read_unlock(); | |
549 | ret = 0; | |
550 | goto end; | |
551 | ||
552 | end_unlock: | |
553 | rcu_read_unlock(); | |
554 | ||
555 | end: | |
556 | end_no_session: | |
557 | return ret; | |
558 | } | |
559 | ||
560 | /* | |
561 | * Allocate and init a new viewer_stream. | |
562 | * | |
563 | * Copies the values from the stream passed in parameter and insert the new | |
564 | * stream in the viewer_streams_ht. | |
565 | * | |
566 | * MUST be called with rcu_read_lock held. | |
567 | * | |
568 | * Returns 0 on success or a negative value on error. | |
569 | */ | |
570 | static | |
92c6ca54 | 571 | int init_viewer_stream(struct relay_stream *stream) |
d3e2ba59 JD |
572 | { |
573 | int ret; | |
574 | struct relay_viewer_stream *viewer_stream; | |
575 | ||
576 | assert(stream); | |
d3e2ba59 JD |
577 | |
578 | viewer_stream = zmalloc(sizeof(*viewer_stream)); | |
579 | if (!viewer_stream) { | |
580 | PERROR("relay viewer stream zmalloc"); | |
581 | ret = -1; | |
582 | goto error; | |
583 | } | |
584 | ||
585 | viewer_stream->read_fd = -1; | |
586 | viewer_stream->index_read_fd = -1; | |
587 | viewer_stream->session_id = stream->session->id; | |
588 | viewer_stream->stream_handle = stream->stream_handle; | |
589 | viewer_stream->path_name = strndup(stream->path_name, | |
590 | LTTNG_VIEWER_PATH_MAX); | |
591 | viewer_stream->channel_name = strndup(stream->channel_name, | |
592 | LTTNG_VIEWER_NAME_MAX); | |
593 | viewer_stream->total_index_received = stream->total_index_received; | |
594 | viewer_stream->tracefile_size = stream->tracefile_size; | |
595 | viewer_stream->tracefile_count = stream->tracefile_count; | |
596 | viewer_stream->metadata_flag = stream->metadata_flag; | |
597 | ||
598 | /* | |
599 | * This is to avoid a race between the initialization of this object and | |
600 | * the close of the given stream. If the stream is unable to find this | |
601 | * viewer stream when closing, this copy will at least take the latest | |
602 | * value. | |
603 | */ | |
604 | viewer_stream->total_index_received = stream->total_index_received; | |
605 | ||
606 | /* | |
607 | * The deletion of this ctf_trace object is only done in a call RCU of the | |
608 | * relay stream making it valid as long as we have the read side lock. | |
609 | */ | |
610 | viewer_stream->ctf_trace = stream->ctf_trace; | |
611 | uatomic_inc(&viewer_stream->ctf_trace->refcount); | |
612 | ||
613 | lttng_ht_node_init_u64(&viewer_stream->stream_n, stream->stream_handle); | |
614 | lttng_ht_add_unique_u64(viewer_streams_ht, &viewer_stream->stream_n); | |
615 | ||
616 | ret = 0; | |
617 | ||
618 | error: | |
619 | return ret; | |
620 | } | |
621 | ||
622 | /* | |
623 | * Send the viewer the list of current sessions. | |
624 | */ | |
625 | static | |
626 | int viewer_attach_session(struct relay_command *cmd, | |
92c6ca54 | 627 | struct lttng_ht *sessions_ht) |
d3e2ba59 JD |
628 | { |
629 | int ret, send_streams = 0, nb_streams = 0; | |
630 | struct lttng_viewer_attach_session_request request; | |
631 | struct lttng_viewer_attach_session_response response; | |
632 | struct lttng_viewer_stream send_stream; | |
633 | struct relay_stream *stream; | |
634 | struct relay_viewer_stream *viewer_stream; | |
635 | struct lttng_ht_node_ulong *node; | |
636 | struct lttng_ht_node_u64 *node64; | |
637 | struct lttng_ht_iter iter; | |
638 | struct relay_session *session; | |
639 | ||
640 | assert(cmd); | |
641 | assert(sessions_ht); | |
d3e2ba59 JD |
642 | |
643 | DBG("Attach session received"); | |
644 | ||
645 | if (cmd->version_check_done == 0) { | |
646 | ERR("Trying to attach session before version check"); | |
647 | ret = -1; | |
648 | goto end_no_session; | |
649 | } | |
650 | ||
651 | ret = cmd->sock->ops->recvmsg(cmd->sock, &request, sizeof(request), 0); | |
652 | if (ret < 0 || ret != sizeof(request)) { | |
653 | if (ret == 0) { | |
654 | /* Orderly shutdown. Not necessary to print an error. */ | |
655 | DBG("Socket %d did an orderly shutdown", cmd->sock->fd); | |
656 | } else { | |
657 | ERR("Relay failed to receive the attach parameters."); | |
658 | } | |
659 | ret = -1; | |
660 | goto error; | |
661 | } | |
662 | ||
663 | rcu_read_lock(); | |
664 | lttng_ht_lookup(sessions_ht, | |
665 | (void *)((unsigned long) be64toh(request.session_id)), &iter); | |
666 | node = lttng_ht_iter_get_node_ulong(&iter); | |
667 | if (node == NULL) { | |
668 | DBG("Relay session %" PRIu64 " not found", | |
669 | be64toh(request.session_id)); | |
670 | response.status = htobe32(VIEWER_ATTACH_UNK); | |
671 | goto send_reply; | |
672 | } | |
673 | ||
674 | session = caa_container_of(node, struct relay_session, session_n); | |
b92fdc2b | 675 | if (cmd->session_id == session->id) { |
d3e2ba59 JD |
676 | /* Same viewer already attached, just send the stream list. */ |
677 | send_streams = 1; | |
678 | response.status = htobe32(VIEWER_ATTACH_OK); | |
679 | } else if (session->viewer_attached != 0) { | |
680 | DBG("Already a viewer attached"); | |
681 | response.status = htobe32(VIEWER_ATTACH_ALREADY); | |
682 | goto send_reply; | |
683 | } else if (session->live_timer == 0) { | |
684 | DBG("Not live session"); | |
685 | response.status = htobe32(VIEWER_ATTACH_NOT_LIVE); | |
686 | goto send_reply; | |
687 | } else { | |
688 | session->viewer_attached++; | |
689 | send_streams = 1; | |
690 | response.status = htobe32(VIEWER_ATTACH_OK); | |
b92fdc2b | 691 | cmd->session_id = session->id; |
d3e2ba59 JD |
692 | cmd->session = session; |
693 | } | |
694 | ||
695 | switch (be32toh(request.seek)) { | |
696 | case VIEWER_SEEK_BEGINNING: | |
697 | /* Default behaviour. */ | |
698 | break; | |
699 | case VIEWER_SEEK_LAST: | |
700 | /* TODO */ | |
701 | break; | |
702 | default: | |
703 | ERR("Wrong seek parameter"); | |
704 | response.status = htobe32(VIEWER_ATTACH_SEEK_ERR); | |
705 | send_streams = 0; | |
706 | goto send_reply; | |
707 | } | |
708 | ||
709 | if (send_streams) { | |
710 | /* We should only be there if we have a session to attach to. */ | |
711 | assert(session); | |
712 | ||
713 | /* | |
714 | * Fill the viewer_streams_ht to count the number of streams | |
715 | * ready to be sent and avoid concurrency issues on the | |
716 | * relay_streams_ht and don't rely on a total session stream count. | |
717 | */ | |
718 | cds_lfht_for_each_entry(relay_streams_ht->ht, &iter.iter, node, node) { | |
719 | struct relay_viewer_stream *vstream; | |
720 | ||
721 | node = lttng_ht_iter_get_node_ulong(&iter); | |
722 | if (!node) { | |
723 | continue; | |
724 | } | |
725 | stream = caa_container_of(node, struct relay_stream, stream_n); | |
726 | if (stream->session != cmd->session) { | |
727 | continue; | |
728 | } | |
729 | ||
730 | /* | |
731 | * Don't send streams with no ctf_trace, they are not ready to be | |
732 | * read. | |
733 | */ | |
734 | if (!stream->ctf_trace) { | |
735 | continue; | |
736 | } | |
737 | ||
92c6ca54 | 738 | vstream = live_find_viewer_stream_by_id(stream->stream_handle); |
d3e2ba59 | 739 | if (!vstream) { |
92c6ca54 | 740 | ret = init_viewer_stream(stream); |
d3e2ba59 JD |
741 | if (ret < 0) { |
742 | goto end_unlock; | |
743 | } | |
744 | } | |
745 | nb_streams++; | |
746 | } | |
747 | response.streams_count = htobe32(nb_streams); | |
748 | } | |
749 | ||
750 | send_reply: | |
751 | ret = cmd->sock->ops->sendmsg(cmd->sock, &response, sizeof(response), 0); | |
752 | if (ret < 0) { | |
753 | ERR("Relay sending viewer attach response"); | |
754 | goto end_unlock; | |
755 | } | |
756 | ||
757 | /* | |
758 | * Unknown or busy session, just return gracefully, the viewer knows what | |
759 | * is happening. | |
760 | */ | |
761 | if (!send_streams) { | |
762 | ret = 0; | |
763 | goto end_unlock; | |
764 | } | |
765 | ||
766 | /* We should only be there if we have a session to attach to. */ | |
767 | assert(session); | |
768 | cds_lfht_for_each_entry(viewer_streams_ht->ht, &iter.iter, node, node) { | |
769 | node64 = lttng_ht_iter_get_node_u64(&iter); | |
770 | if (!node64) { | |
771 | continue; | |
772 | } | |
773 | viewer_stream = caa_container_of(node64, struct relay_viewer_stream, | |
774 | stream_n); | |
775 | if (viewer_stream->session_id != cmd->session->id) { | |
776 | continue; | |
777 | } | |
778 | ||
779 | send_stream.id = htobe64(viewer_stream->stream_handle); | |
780 | send_stream.ctf_trace_id = htobe64(viewer_stream->ctf_trace->id); | |
781 | send_stream.metadata_flag = htobe32(viewer_stream->metadata_flag); | |
782 | strncpy(send_stream.path_name, viewer_stream->path_name, | |
783 | sizeof(send_stream.path_name)); | |
784 | strncpy(send_stream.channel_name, viewer_stream->channel_name, | |
785 | sizeof(send_stream.channel_name)); | |
786 | ||
787 | ret = cmd->sock->ops->sendmsg(cmd->sock, &send_stream, | |
788 | sizeof(send_stream), 0); | |
789 | if (ret < 0) { | |
790 | ERR("Relay sending stream %" PRIu64, viewer_stream->stream_handle); | |
791 | goto end_unlock; | |
792 | } | |
793 | DBG("Sent stream %" PRIu64 " to viewer", viewer_stream->stream_handle); | |
794 | } | |
795 | ret = 0; | |
796 | ||
797 | end_unlock: | |
798 | rcu_read_unlock(); | |
799 | end_no_session: | |
800 | error: | |
801 | return ret; | |
802 | } | |
803 | ||
804 | /* | |
805 | * Open index file using a given viewer stream. | |
806 | * | |
807 | * Return 0 on success or else a negative value. | |
808 | */ | |
809 | static int open_index(struct relay_viewer_stream *stream) | |
810 | { | |
811 | int ret; | |
812 | char fullpath[PATH_MAX]; | |
813 | struct lttng_packet_index_file_hdr hdr; | |
814 | ||
815 | if (stream->tracefile_size > 0) { | |
816 | /* For now we don't support on-disk ring buffer. */ | |
817 | ret = -1; | |
818 | goto end; | |
819 | } else { | |
820 | ret = snprintf(fullpath, sizeof(fullpath), "%s/" DEFAULT_INDEX_DIR | |
821 | "/%s" DEFAULT_INDEX_FILE_SUFFIX, | |
822 | stream->path_name, stream->channel_name); | |
823 | if (ret < 0) { | |
824 | PERROR("snprintf index path"); | |
825 | goto error; | |
826 | } | |
827 | } | |
828 | ||
829 | DBG("Opening index file %s in read only", fullpath); | |
830 | ret = open(fullpath, O_RDONLY); | |
831 | if (ret < 0) { | |
832 | if (errno == ENOENT) { | |
833 | ret = ENOENT; | |
834 | goto error; | |
835 | } else { | |
836 | PERROR("opening index in read-only"); | |
837 | } | |
838 | goto error; | |
839 | } | |
840 | stream->index_read_fd = ret; | |
841 | DBG("Opening index file %s in read only, (fd: %d)", fullpath, ret); | |
842 | ||
843 | do { | |
844 | ret = read(stream->index_read_fd, &hdr, sizeof(hdr)); | |
845 | } while (ret < 0 && errno == EINTR); | |
846 | if (ret < 0) { | |
847 | PERROR("Reading index header"); | |
848 | goto error; | |
849 | } | |
850 | if (strncmp(hdr.magic, INDEX_MAGIC, sizeof(hdr.magic)) != 0) { | |
851 | ERR("Invalid header magic"); | |
852 | ret = -1; | |
853 | goto error; | |
854 | } | |
855 | if (be32toh(hdr.index_major) != INDEX_MAJOR || | |
856 | be32toh(hdr.index_minor) != INDEX_MINOR) { | |
857 | ERR("Invalid header version"); | |
858 | ret = -1; | |
859 | goto error; | |
860 | } | |
861 | ret = 0; | |
862 | ||
863 | error: | |
864 | end: | |
865 | return ret; | |
866 | } | |
867 | ||
868 | /* | |
869 | * Get viewer stream from stream id. | |
870 | * | |
871 | * RCU read side lock MUST be acquired. | |
872 | */ | |
92c6ca54 | 873 | struct relay_viewer_stream *live_find_viewer_stream_by_id(uint64_t stream_id) |
d3e2ba59 JD |
874 | { |
875 | struct lttng_ht_node_u64 *node; | |
876 | struct lttng_ht_iter iter; | |
877 | struct relay_viewer_stream *stream = NULL; | |
878 | ||
d3e2ba59 JD |
879 | lttng_ht_lookup(viewer_streams_ht, &stream_id, &iter); |
880 | node = lttng_ht_iter_get_node_u64(&iter); | |
881 | if (node == NULL) { | |
882 | DBG("Relay viewer stream %" PRIu64 " not found", stream_id); | |
883 | goto end; | |
884 | } | |
885 | stream = caa_container_of(node, struct relay_viewer_stream, stream_n); | |
886 | ||
887 | end: | |
888 | return stream; | |
889 | } | |
890 | ||
891 | /* | |
892 | * Send the next index for a stream. | |
893 | * | |
894 | * Return 0 on success or else a negative value. | |
895 | */ | |
896 | static | |
897 | int viewer_get_next_index(struct relay_command *cmd, | |
92c6ca54 | 898 | struct lttng_ht *sessions_ht) |
d3e2ba59 JD |
899 | { |
900 | int ret; | |
901 | struct lttng_viewer_get_next_index request_index; | |
902 | struct lttng_viewer_index viewer_index; | |
903 | struct lttng_packet_index packet_index; | |
904 | struct relay_viewer_stream *vstream; | |
905 | struct relay_stream *rstream; | |
906 | ||
907 | assert(cmd); | |
d3e2ba59 JD |
908 | assert(sessions_ht); |
909 | ||
910 | DBG("Viewer get next index"); | |
911 | ||
912 | if (cmd->version_check_done == 0) { | |
913 | ERR("Trying to request index before version check"); | |
914 | ret = -1; | |
915 | goto end_no_session; | |
916 | } | |
917 | ||
918 | ret = cmd->sock->ops->recvmsg(cmd->sock, &request_index, | |
919 | sizeof(request_index), 0); | |
920 | if (ret < 0 || ret != sizeof(request_index)) { | |
921 | ret = -1; | |
922 | ERR("Relay didn't receive the whole packet"); | |
923 | goto end; | |
924 | } | |
925 | ||
926 | rcu_read_lock(); | |
92c6ca54 | 927 | vstream = live_find_viewer_stream_by_id(be64toh(request_index.stream_id)); |
d3e2ba59 JD |
928 | if (!vstream) { |
929 | ret = -1; | |
930 | goto end_unlock; | |
931 | } | |
932 | ||
933 | memset(&viewer_index, 0, sizeof(viewer_index)); | |
934 | ||
935 | /* | |
936 | * The viewer should not ask for index on metadata stream. | |
937 | */ | |
938 | if (vstream->metadata_flag) { | |
939 | viewer_index.status = htobe32(VIEWER_INDEX_HUP); | |
940 | goto send_reply; | |
941 | } | |
942 | ||
943 | /* First time, we open the index file */ | |
944 | if (vstream->index_read_fd < 0) { | |
945 | ret = open_index(vstream); | |
946 | if (ret == ENOENT) { | |
947 | /* | |
948 | * The index is created only when the first data packet arrives, it | |
949 | * might not be ready at the beginning of the session | |
950 | */ | |
951 | viewer_index.status = htobe32(VIEWER_INDEX_RETRY); | |
952 | goto send_reply; | |
953 | } else if (ret < 0) { | |
954 | viewer_index.status = htobe32(VIEWER_INDEX_ERR); | |
955 | goto send_reply; | |
956 | } | |
957 | } | |
958 | ||
959 | rstream = relay_stream_find_by_id(vstream->stream_handle); | |
960 | if (rstream) { | |
961 | if (rstream->beacon_ts_end != -1ULL && | |
962 | vstream->last_sent_index == rstream->total_index_received) { | |
963 | viewer_index.status = htobe32(VIEWER_INDEX_INACTIVE); | |
964 | viewer_index.timestamp_end = htobe64(rstream->beacon_ts_end); | |
965 | goto send_reply; | |
966 | } | |
967 | ||
968 | if (rstream->total_index_received <= vstream->last_sent_index) { | |
969 | /* No new index to send, retry later. */ | |
970 | viewer_index.status = htobe32(VIEWER_INDEX_RETRY); | |
971 | goto send_reply; | |
972 | } | |
973 | } else if (!rstream && | |
974 | vstream->total_index_received == vstream->last_sent_index) { | |
975 | /* Last index sent and stream closed */ | |
976 | viewer_index.status = htobe32(VIEWER_INDEX_HUP); | |
977 | goto send_reply; | |
978 | } | |
979 | ||
980 | if (!vstream->ctf_trace->metadata_received || | |
981 | vstream->ctf_trace->metadata_received > | |
982 | vstream->ctf_trace->metadata_sent) { | |
983 | viewer_index.flags |= LTTNG_VIEWER_FLAG_NEW_METADATA; | |
984 | } | |
985 | ||
986 | do { | |
987 | ret = read(vstream->index_read_fd, &packet_index, | |
988 | sizeof(packet_index)); | |
989 | } while (ret < 0 && errno == EINTR); | |
990 | if (ret < sizeof(packet_index)) { | |
991 | PERROR("Relay reading index file"); | |
992 | viewer_index.status = htobe32(VIEWER_INDEX_ERR); | |
993 | } else { | |
994 | viewer_index.status = htobe32(VIEWER_INDEX_OK); | |
995 | vstream->last_sent_index++; | |
996 | } | |
997 | ||
998 | /* | |
999 | * Indexes are stored in big endian, no need to switch before sending. | |
1000 | */ | |
1001 | viewer_index.offset = packet_index.offset; | |
1002 | viewer_index.packet_size = packet_index.packet_size; | |
1003 | viewer_index.content_size = packet_index.content_size; | |
1004 | viewer_index.timestamp_begin = packet_index.timestamp_begin; | |
1005 | viewer_index.timestamp_end = packet_index.timestamp_end; | |
1006 | viewer_index.events_discarded = packet_index.events_discarded; | |
1007 | viewer_index.stream_id = packet_index.stream_id; | |
1008 | ||
1009 | send_reply: | |
1010 | viewer_index.flags = htobe32(viewer_index.flags); | |
1011 | ret = cmd->sock->ops->sendmsg(cmd->sock, &viewer_index, | |
1012 | sizeof(viewer_index), 0); | |
1013 | if (ret < 0) { | |
1014 | ERR("Relay index to viewer"); | |
1015 | goto end_unlock; | |
1016 | } | |
1017 | ||
1018 | DBG("Index %" PRIu64 "for stream %" PRIu64 "sent", | |
1019 | vstream->last_sent_index, vstream->stream_handle); | |
1020 | ||
1021 | end_unlock: | |
1022 | rcu_read_unlock(); | |
1023 | ||
1024 | end_no_session: | |
1025 | end: | |
1026 | return ret; | |
1027 | } | |
1028 | ||
1029 | /* | |
1030 | * Send the next index for a stream | |
1031 | * | |
1032 | * Return 0 on success or else a negative value. | |
1033 | */ | |
1034 | static | |
92c6ca54 | 1035 | int viewer_get_packet(struct relay_command *cmd) |
d3e2ba59 JD |
1036 | { |
1037 | int ret, send_data = 0; | |
1038 | char *data = NULL; | |
1039 | uint32_t len = 0; | |
1040 | ssize_t read_len; | |
1041 | struct lttng_viewer_get_packet get_packet_info; | |
1042 | struct lttng_viewer_trace_packet reply; | |
1043 | struct relay_viewer_stream *stream; | |
1044 | ||
1045 | assert(cmd); | |
d3e2ba59 JD |
1046 | |
1047 | DBG2("Relay get data packet"); | |
1048 | ||
1049 | if (cmd->version_check_done == 0) { | |
1050 | ERR("Trying to get packet before version check"); | |
1051 | ret = -1; | |
1052 | goto end; | |
1053 | } | |
1054 | ||
1055 | ret = cmd->sock->ops->recvmsg(cmd->sock, &get_packet_info, | |
1056 | sizeof(get_packet_info), 0); | |
1057 | if (ret < 0 || ret != sizeof(get_packet_info)) { | |
1058 | ret = -1; | |
1059 | ERR("Relay didn't receive the whole packet"); | |
1060 | goto end; | |
1061 | } | |
1062 | ||
1063 | rcu_read_lock(); | |
92c6ca54 | 1064 | stream = live_find_viewer_stream_by_id(be64toh(get_packet_info.stream_id)); |
d3e2ba59 JD |
1065 | if (!stream) { |
1066 | goto error; | |
1067 | } | |
1068 | assert(stream->ctf_trace); | |
1069 | ||
1070 | /* | |
1071 | * First time we read this stream, we need open the tracefile, we should | |
1072 | * only arrive here if an index has already been sent to the viewer, so the | |
1073 | * tracefile must exist, if it does not it is a fatal error. | |
1074 | */ | |
1075 | if (stream->read_fd < 0) { | |
1076 | char fullpath[PATH_MAX]; | |
1077 | ||
1078 | ret = snprintf(fullpath, PATH_MAX, "%s/%s", stream->path_name, | |
1079 | stream->channel_name); | |
1080 | if (ret < 0) { | |
1081 | goto error; | |
1082 | } | |
1083 | ret = open(fullpath, O_RDONLY); | |
1084 | if (ret < 0) { | |
1085 | PERROR("Relay opening trace file"); | |
1086 | goto error; | |
1087 | } | |
1088 | stream->read_fd = ret; | |
1089 | } | |
1090 | ||
1091 | memset(&reply, 0, sizeof(reply)); | |
1092 | ||
1093 | if (!stream->ctf_trace->metadata_received || | |
1094 | stream->ctf_trace->metadata_received > | |
1095 | stream->ctf_trace->metadata_sent) { | |
1096 | reply.status = htobe32(VIEWER_GET_PACKET_ERR); | |
1097 | reply.flags |= LTTNG_VIEWER_FLAG_NEW_METADATA; | |
1098 | ||
1099 | goto send_reply; | |
1100 | } | |
1101 | ||
1102 | len = be32toh(get_packet_info.len); | |
1103 | data = zmalloc(len); | |
1104 | if (!data) { | |
1105 | PERROR("relay data zmalloc"); | |
1106 | goto error; | |
1107 | } | |
1108 | ||
1109 | ret = lseek(stream->read_fd, be64toh(get_packet_info.offset), SEEK_SET); | |
1110 | if (ret < 0) { | |
1111 | PERROR("lseek"); | |
1112 | goto error; | |
1113 | } | |
1114 | read_len = read(stream->read_fd, data, len); | |
1115 | if (read_len < (ssize_t) len) { | |
1116 | PERROR("Relay reading trace file, fd: %d, offset: %" PRIu64, | |
1117 | stream->read_fd, be64toh(get_packet_info.offset)); | |
1118 | goto error; | |
1119 | } | |
1120 | reply.status = htobe32(VIEWER_GET_PACKET_OK); | |
1121 | reply.len = htobe32(len); | |
1122 | send_data = 1; | |
1123 | goto send_reply; | |
1124 | ||
1125 | error: | |
1126 | reply.status = htobe32(VIEWER_GET_PACKET_ERR); | |
1127 | ||
1128 | send_reply: | |
1129 | reply.flags = htobe32(reply.flags); | |
1130 | ret = cmd->sock->ops->sendmsg(cmd->sock, &reply, sizeof(reply), 0); | |
1131 | if (ret < 0) { | |
1132 | ERR("Relay data header to viewer"); | |
1133 | goto end_unlock; | |
1134 | } | |
1135 | ||
1136 | if (send_data) { | |
1137 | ret = cmd->sock->ops->sendmsg(cmd->sock, data, len, 0); | |
1138 | if (ret < 0) { | |
1139 | ERR("Relay send data to viewer"); | |
1140 | goto end_unlock; | |
1141 | } | |
1142 | } | |
1143 | ||
1144 | DBG("Sent %u bytes for stream %" PRIu64, len, | |
1145 | be64toh(get_packet_info.stream_id)); | |
1146 | ||
1147 | end_unlock: | |
1148 | free(data); | |
1149 | rcu_read_unlock(); | |
1150 | ||
1151 | end: | |
1152 | return ret; | |
1153 | } | |
1154 | ||
1155 | /* | |
1156 | * Send the session's metadata | |
1157 | * | |
1158 | * Return 0 on success else a negative value. | |
1159 | */ | |
1160 | static | |
92c6ca54 | 1161 | int viewer_get_metadata(struct relay_command *cmd) |
d3e2ba59 JD |
1162 | { |
1163 | int ret = 0; | |
1164 | ssize_t read_len; | |
1165 | uint64_t len = 0; | |
1166 | char *data = NULL; | |
1167 | struct lttng_viewer_get_metadata request; | |
1168 | struct lttng_viewer_metadata_packet reply; | |
1169 | struct relay_viewer_stream *stream; | |
1170 | ||
1171 | assert(cmd); | |
d3e2ba59 JD |
1172 | |
1173 | DBG("Relay get metadata"); | |
1174 | ||
1175 | if (cmd->version_check_done == 0) { | |
1176 | ERR("Trying to get metadata before version check"); | |
1177 | ret = -1; | |
1178 | goto end; | |
1179 | } | |
1180 | ||
1181 | ret = cmd->sock->ops->recvmsg(cmd->sock, &request, | |
1182 | sizeof(request), 0); | |
1183 | if (ret < 0 || ret != sizeof(request)) { | |
1184 | ret = -1; | |
1185 | ERR("Relay didn't receive the whole packet"); | |
1186 | goto end; | |
1187 | } | |
1188 | ||
1189 | rcu_read_lock(); | |
92c6ca54 | 1190 | stream = live_find_viewer_stream_by_id(be64toh(request.stream_id)); |
d3e2ba59 JD |
1191 | if (!stream || !stream->metadata_flag) { |
1192 | ERR("Invalid metadata stream"); | |
1193 | goto error; | |
1194 | } | |
1195 | assert(stream->ctf_trace); | |
1196 | assert(stream->ctf_trace->metadata_sent <= | |
1197 | stream->ctf_trace->metadata_received); | |
1198 | ||
1199 | len = stream->ctf_trace->metadata_received - | |
1200 | stream->ctf_trace->metadata_sent; | |
1201 | if (len == 0) { | |
1202 | reply.status = htobe32(VIEWER_NO_NEW_METADATA); | |
1203 | goto send_reply; | |
1204 | } | |
1205 | ||
1206 | /* first time, we open the metadata file */ | |
1207 | if (stream->read_fd < 0) { | |
1208 | char fullpath[PATH_MAX]; | |
1209 | ||
1210 | ret = snprintf(fullpath, PATH_MAX, "%s/%s", stream->path_name, | |
1211 | stream->channel_name); | |
1212 | if (ret < 0) { | |
1213 | goto error; | |
1214 | } | |
1215 | ret = open(fullpath, O_RDONLY); | |
1216 | if (ret < 0) { | |
1217 | PERROR("Relay opening metadata file"); | |
1218 | goto error; | |
1219 | } | |
1220 | stream->read_fd = ret; | |
1221 | } | |
1222 | ||
1223 | reply.len = htobe64(len); | |
1224 | data = zmalloc(len); | |
1225 | if (!data) { | |
1226 | PERROR("viewer metadata zmalloc"); | |
1227 | goto error; | |
1228 | } | |
1229 | ||
1230 | read_len = read(stream->read_fd, data, len); | |
1231 | if (read_len < (ssize_t) len) { | |
1232 | PERROR("Relay reading metadata file"); | |
1233 | goto error; | |
1234 | } | |
1235 | stream->ctf_trace->metadata_sent += read_len; | |
1236 | reply.status = htobe32(VIEWER_METADATA_OK); | |
1237 | goto send_reply; | |
1238 | ||
1239 | error: | |
1240 | reply.status = htobe32(VIEWER_METADATA_ERR); | |
1241 | ||
1242 | send_reply: | |
1243 | ret = cmd->sock->ops->sendmsg(cmd->sock, &reply, sizeof(reply), 0); | |
1244 | if (ret < 0) { | |
1245 | ERR("Relay data header to viewer"); | |
1246 | goto end_unlock; | |
1247 | } | |
1248 | ||
1249 | if (len > 0) { | |
1250 | ret = cmd->sock->ops->sendmsg(cmd->sock, data, len, 0); | |
1251 | if (ret < 0) { | |
1252 | ERR("Relay send data to viewer"); | |
1253 | goto end_unlock; | |
1254 | } | |
1255 | } | |
1256 | ||
1257 | DBG("Sent %" PRIu64 " bytes of metadata for stream %" PRIu64, len, | |
1258 | be64toh(request.stream_id)); | |
1259 | ||
1260 | DBG("Metadata sent"); | |
1261 | ||
1262 | end_unlock: | |
1263 | free(data); | |
1264 | rcu_read_unlock(); | |
1265 | end: | |
1266 | return ret; | |
1267 | } | |
1268 | ||
1269 | /* | |
1270 | * live_relay_unknown_command: send -1 if received unknown command | |
1271 | */ | |
1272 | static | |
1273 | void live_relay_unknown_command(struct relay_command *cmd) | |
1274 | { | |
1275 | struct lttcomm_relayd_generic_reply reply; | |
1276 | int ret; | |
1277 | ||
1278 | reply.ret_code = htobe32(LTTNG_ERR_UNK); | |
1279 | ret = cmd->sock->ops->sendmsg(cmd->sock, &reply, | |
1280 | sizeof(struct lttcomm_relayd_generic_reply), 0); | |
1281 | if (ret < 0) { | |
1282 | ERR("Relay sending unknown command"); | |
1283 | } | |
1284 | } | |
1285 | ||
1286 | /* | |
1287 | * Process the commands received on the control socket | |
1288 | */ | |
1289 | static | |
1290 | int process_control(struct lttng_viewer_cmd *recv_hdr, | |
92c6ca54 | 1291 | struct relay_command *cmd, struct lttng_ht *sessions_ht) |
d3e2ba59 JD |
1292 | { |
1293 | int ret = 0; | |
1294 | ||
1295 | switch (be32toh(recv_hdr->cmd)) { | |
1296 | case VIEWER_CONNECT: | |
1297 | ret = viewer_connect(cmd); | |
1298 | break; | |
1299 | case VIEWER_LIST_SESSIONS: | |
1300 | ret = viewer_list_sessions(cmd, sessions_ht); | |
1301 | break; | |
1302 | case VIEWER_ATTACH_SESSION: | |
92c6ca54 | 1303 | ret = viewer_attach_session(cmd, sessions_ht); |
d3e2ba59 JD |
1304 | break; |
1305 | case VIEWER_GET_NEXT_INDEX: | |
92c6ca54 | 1306 | ret = viewer_get_next_index(cmd, sessions_ht); |
d3e2ba59 JD |
1307 | break; |
1308 | case VIEWER_GET_PACKET: | |
92c6ca54 | 1309 | ret = viewer_get_packet(cmd); |
d3e2ba59 JD |
1310 | break; |
1311 | case VIEWER_GET_METADATA: | |
92c6ca54 | 1312 | ret = viewer_get_metadata(cmd); |
d3e2ba59 JD |
1313 | break; |
1314 | default: | |
1315 | ERR("Received unknown viewer command (%u)", be32toh(recv_hdr->cmd)); | |
1316 | live_relay_unknown_command(cmd); | |
1317 | ret = -1; | |
1318 | goto end; | |
1319 | } | |
1320 | ||
1321 | end: | |
1322 | return ret; | |
1323 | } | |
1324 | ||
1325 | static | |
1326 | void cleanup_poll_connection(struct lttng_poll_event *events, int pollfd) | |
1327 | { | |
1328 | int ret; | |
1329 | ||
1330 | assert(events); | |
1331 | ||
1332 | lttng_poll_del(events, pollfd); | |
1333 | ||
1334 | ret = close(pollfd); | |
1335 | if (ret < 0) { | |
1336 | ERR("Closing pollfd %d", pollfd); | |
1337 | } | |
1338 | } | |
1339 | ||
1340 | /* | |
1341 | * Create and add connection to the given hash table. | |
1342 | * | |
1343 | * Return poll add value or else -1 on error. | |
1344 | */ | |
1345 | static | |
1346 | int add_connection(int fd, struct lttng_poll_event *events, | |
1347 | struct lttng_ht *relay_connections_ht) | |
1348 | { | |
1349 | int ret; | |
1350 | struct relay_command *relay_connection; | |
1351 | ||
1352 | assert(events); | |
1353 | assert(relay_connections_ht); | |
1354 | ||
1355 | relay_connection = zmalloc(sizeof(struct relay_command)); | |
1356 | if (relay_connection == NULL) { | |
1357 | PERROR("Relay command zmalloc"); | |
1358 | goto error; | |
1359 | } | |
1360 | ||
1361 | do { | |
1362 | ret = read(fd, relay_connection, sizeof(*relay_connection)); | |
1363 | } while (ret < 0 && errno == EINTR); | |
1364 | if (ret < 0 || ret < sizeof(*relay_connection)) { | |
1365 | PERROR("read relay cmd pipe"); | |
1366 | goto error_read; | |
1367 | } | |
1368 | ||
1369 | lttng_ht_node_init_ulong(&relay_connection->sock_n, | |
1370 | (unsigned long) relay_connection->sock->fd); | |
1371 | rcu_read_lock(); | |
1372 | lttng_ht_add_unique_ulong(relay_connections_ht, | |
1373 | &relay_connection->sock_n); | |
1374 | rcu_read_unlock(); | |
1375 | ||
1376 | return lttng_poll_add(events, relay_connection->sock->fd, | |
1377 | LPOLLIN | LPOLLRDHUP); | |
1378 | ||
1379 | error_read: | |
1380 | free(relay_connection); | |
1381 | error: | |
1382 | return -1; | |
1383 | } | |
1384 | ||
1385 | static | |
1386 | void deferred_free_connection(struct rcu_head *head) | |
1387 | { | |
1388 | struct relay_command *relay_connection = | |
1389 | caa_container_of(head, struct relay_command, rcu_node); | |
1390 | ||
1391 | if (relay_connection->session && | |
1392 | relay_connection->session->viewer_attached > 0) { | |
1393 | relay_connection->session->viewer_attached--; | |
1394 | } | |
1395 | lttcomm_destroy_sock(relay_connection->sock); | |
1396 | free(relay_connection); | |
1397 | } | |
1398 | ||
1399 | static | |
1400 | void deferred_free_viewer_stream(struct rcu_head *head) | |
1401 | { | |
1402 | struct relay_viewer_stream *stream = | |
1403 | caa_container_of(head, struct relay_viewer_stream, rcu_node); | |
1404 | ||
1405 | if (stream->ctf_trace) { | |
1406 | uatomic_dec(&stream->ctf_trace->refcount); | |
1407 | assert(uatomic_read(&stream->ctf_trace->refcount) >= 0); | |
1408 | if (uatomic_read(&stream->ctf_trace->refcount) == 0) { | |
1409 | DBG("Freeing ctf_trace %" PRIu64, stream->ctf_trace->id); | |
1410 | free(stream->ctf_trace); | |
1411 | } | |
1412 | } | |
1413 | ||
1414 | free(stream->path_name); | |
1415 | free(stream->channel_name); | |
1416 | free(stream); | |
1417 | } | |
1418 | ||
1419 | static | |
b92fdc2b | 1420 | void viewer_del_streams(uint64_t session_id) |
d3e2ba59 JD |
1421 | { |
1422 | int ret; | |
1423 | struct relay_viewer_stream *stream; | |
1424 | struct lttng_ht_node_u64 *node; | |
1425 | struct lttng_ht_iter iter; | |
1426 | ||
d3e2ba59 JD |
1427 | rcu_read_lock(); |
1428 | cds_lfht_for_each_entry(viewer_streams_ht->ht, &iter.iter, node, node) { | |
1429 | node = lttng_ht_iter_get_node_u64(&iter); | |
1430 | if (!node) { | |
1431 | continue; | |
1432 | } | |
1433 | ||
1434 | stream = caa_container_of(node, struct relay_viewer_stream, stream_n); | |
b92fdc2b | 1435 | if (stream->session_id != session_id) { |
d3e2ba59 JD |
1436 | continue; |
1437 | } | |
1438 | ||
1439 | if (stream->read_fd > 0) { | |
1440 | ret = close(stream->read_fd); | |
1441 | if (ret < 0) { | |
1442 | PERROR("close read_fd"); | |
1443 | } | |
1444 | } | |
1445 | if (stream->index_read_fd > 0) { | |
1446 | ret = close(stream->index_read_fd); | |
1447 | if (ret < 0) { | |
1448 | PERROR("close index_read_fd"); | |
1449 | } | |
1450 | } | |
1451 | if (stream->metadata_flag && stream->ctf_trace) { | |
1452 | stream->ctf_trace->metadata_sent = 0; | |
1453 | } | |
1454 | ret = lttng_ht_del(viewer_streams_ht, &iter); | |
1455 | assert(!ret); | |
1456 | call_rcu(&stream->rcu_node, deferred_free_viewer_stream); | |
1457 | } | |
1458 | rcu_read_unlock(); | |
1459 | } | |
1460 | ||
1461 | /* | |
1462 | * Delete and free a connection. | |
1463 | * | |
1464 | * RCU read side lock MUST be acquired. | |
1465 | */ | |
1466 | static | |
1467 | void del_connection(struct lttng_ht *relay_connections_ht, | |
92c6ca54 | 1468 | struct lttng_ht_iter *iter, struct relay_command *relay_connection) |
d3e2ba59 JD |
1469 | { |
1470 | int ret; | |
1471 | ||
1472 | assert(relay_connections_ht); | |
1473 | assert(iter); | |
1474 | assert(relay_connection); | |
d3e2ba59 JD |
1475 | |
1476 | ret = lttng_ht_del(relay_connections_ht, iter); | |
1477 | assert(!ret); | |
1478 | ||
b92fdc2b | 1479 | viewer_del_streams(relay_connection->session_id); |
d3e2ba59 JD |
1480 | |
1481 | call_rcu(&relay_connection->rcu_node, deferred_free_connection); | |
1482 | } | |
1483 | ||
1484 | /* | |
1485 | * This thread does the actual work | |
1486 | */ | |
1487 | static | |
1488 | void *thread_worker(void *data) | |
1489 | { | |
1490 | int ret, err = -1; | |
1491 | uint32_t nb_fd; | |
1492 | struct relay_command *relay_connection; | |
1493 | struct lttng_poll_event events; | |
1494 | struct lttng_ht *relay_connections_ht; | |
1495 | struct lttng_ht_node_ulong *node; | |
1496 | struct lttng_ht_iter iter; | |
1497 | struct lttng_viewer_cmd recv_hdr; | |
1498 | struct relay_local_data *relay_ctx = (struct relay_local_data *) data; | |
1499 | struct lttng_ht *sessions_ht = relay_ctx->sessions_ht; | |
d3e2ba59 JD |
1500 | |
1501 | DBG("[thread] Live viewer relay worker started"); | |
1502 | ||
1503 | rcu_register_thread(); | |
1504 | ||
1505 | /* table of connections indexed on socket */ | |
1506 | relay_connections_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); | |
1507 | if (!relay_connections_ht) { | |
1508 | goto relay_connections_ht_error; | |
1509 | } | |
1510 | ||
1511 | ret = create_thread_poll_set(&events, 2); | |
1512 | if (ret < 0) { | |
1513 | goto error_poll_create; | |
1514 | } | |
1515 | ||
1516 | ret = lttng_poll_add(&events, live_relay_cmd_pipe[0], LPOLLIN | LPOLLRDHUP); | |
1517 | if (ret < 0) { | |
1518 | goto error; | |
1519 | } | |
1520 | ||
1521 | restart: | |
1522 | while (1) { | |
1523 | int i; | |
1524 | ||
1525 | /* Infinite blocking call, waiting for transmission */ | |
1526 | DBG3("Relayd live viewer worker thread polling..."); | |
1527 | ret = lttng_poll_wait(&events, -1); | |
1528 | if (ret < 0) { | |
1529 | /* | |
1530 | * Restart interrupted system call. | |
1531 | */ | |
1532 | if (errno == EINTR) { | |
1533 | goto restart; | |
1534 | } | |
1535 | goto error; | |
1536 | } | |
1537 | ||
1538 | nb_fd = ret; | |
1539 | ||
1540 | /* | |
1541 | * Process control. The control connection is prioritised so we don't | |
1542 | * starve it with high throughput tracing data on the data | |
1543 | * connection. | |
1544 | */ | |
1545 | for (i = 0; i < nb_fd; i++) { | |
1546 | /* Fetch once the poll data */ | |
1547 | uint32_t revents = LTTNG_POLL_GETEV(&events, i); | |
1548 | int pollfd = LTTNG_POLL_GETFD(&events, i); | |
1549 | ||
1550 | /* Thread quit pipe has been closed. Killing thread. */ | |
1551 | ret = check_thread_quit_pipe(pollfd, revents); | |
1552 | if (ret) { | |
1553 | err = 0; | |
1554 | goto exit; | |
1555 | } | |
1556 | ||
1557 | /* Inspect the relay cmd pipe for new connection */ | |
1558 | if (pollfd == live_relay_cmd_pipe[0]) { | |
1559 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
1560 | ERR("Relay live pipe error"); | |
1561 | goto error; | |
1562 | } else if (revents & LPOLLIN) { | |
1563 | DBG("Relay live viewer command received"); | |
1564 | ret = add_connection(live_relay_cmd_pipe[0], | |
1565 | &events, relay_connections_ht); | |
1566 | if (ret < 0) { | |
1567 | goto error; | |
1568 | } | |
1569 | } | |
1570 | } else if (revents) { | |
1571 | rcu_read_lock(); | |
1572 | lttng_ht_lookup(relay_connections_ht, | |
1573 | (void *)((unsigned long) pollfd), &iter); | |
1574 | node = lttng_ht_iter_get_node_ulong(&iter); | |
1575 | if (node == NULL) { | |
1576 | DBG2("Relay viewer sock %d not found", pollfd); | |
1577 | rcu_read_unlock(); | |
1578 | goto error; | |
1579 | } | |
1580 | relay_connection = caa_container_of(node, struct relay_command, | |
1581 | sock_n); | |
1582 | ||
1583 | if (revents & (LPOLLERR)) { | |
d3e2ba59 JD |
1584 | cleanup_poll_connection(&events, pollfd); |
1585 | del_connection(relay_connections_ht, &iter, | |
92c6ca54 | 1586 | relay_connection); |
d3e2ba59 JD |
1587 | } else if (revents & (LPOLLHUP | LPOLLRDHUP)) { |
1588 | DBG("Viewer socket %d hung up", pollfd); | |
1589 | cleanup_poll_connection(&events, pollfd); | |
1590 | del_connection(relay_connections_ht, &iter, | |
92c6ca54 | 1591 | relay_connection); |
d3e2ba59 JD |
1592 | } else if (revents & LPOLLIN) { |
1593 | ret = relay_connection->sock->ops->recvmsg( | |
1594 | relay_connection->sock, &recv_hdr, | |
1595 | sizeof(struct lttng_viewer_cmd), | |
1596 | 0); | |
1597 | /* connection closed */ | |
1598 | if (ret <= 0) { | |
1599 | cleanup_poll_connection(&events, pollfd); | |
1600 | del_connection( relay_connections_ht, &iter, | |
92c6ca54 | 1601 | relay_connection); |
d3e2ba59 JD |
1602 | DBG("Viewer control connection closed with %d", |
1603 | pollfd); | |
1604 | } else { | |
1605 | if (relay_connection->session) { | |
1606 | DBG2("Relay viewer worker receiving data for " | |
1607 | "session: %" PRIu64, | |
1608 | relay_connection->session->id); | |
1609 | } | |
1610 | ret = process_control(&recv_hdr, relay_connection, | |
92c6ca54 | 1611 | sessions_ht); |
d3e2ba59 JD |
1612 | if (ret < 0) { |
1613 | /* Clear the session on error. */ | |
1614 | cleanup_poll_connection(&events, pollfd); | |
1615 | del_connection(relay_connections_ht, &iter, | |
92c6ca54 | 1616 | relay_connection); |
d3e2ba59 JD |
1617 | DBG("Viewer connection closed with %d", pollfd); |
1618 | } | |
1619 | } | |
1620 | } | |
1621 | rcu_read_unlock(); | |
1622 | } | |
1623 | } | |
1624 | } | |
1625 | ||
1626 | exit: | |
1627 | error: | |
1628 | lttng_poll_clean(&events); | |
1629 | ||
1630 | /* empty the hash table and free the memory */ | |
1631 | rcu_read_lock(); | |
1632 | cds_lfht_for_each_entry(relay_connections_ht->ht, &iter.iter, node, node) { | |
1633 | node = lttng_ht_iter_get_node_ulong(&iter); | |
1634 | if (!node) { | |
1635 | continue; | |
1636 | } | |
1637 | ||
1638 | relay_connection = caa_container_of(node, struct relay_command, | |
1639 | sock_n); | |
92c6ca54 | 1640 | del_connection(relay_connections_ht, &iter, relay_connection); |
d3e2ba59 JD |
1641 | } |
1642 | rcu_read_unlock(); | |
1643 | error_poll_create: | |
1644 | lttng_ht_destroy(relay_connections_ht); | |
1645 | relay_connections_ht_error: | |
1646 | /* Close relay cmd pipes */ | |
1647 | utils_close_pipe(live_relay_cmd_pipe); | |
1648 | if (err) { | |
1649 | DBG("Viewer worker thread exited with error"); | |
1650 | } | |
1651 | DBG("Viewer worker thread cleanup complete"); | |
1652 | stop_threads(); | |
1653 | rcu_unregister_thread(); | |
1654 | return NULL; | |
1655 | } | |
1656 | ||
1657 | /* | |
1658 | * Create the relay command pipe to wake thread_manage_apps. | |
1659 | * Closed in cleanup(). | |
1660 | */ | |
1661 | static int create_relay_cmd_pipe(void) | |
1662 | { | |
1663 | int ret; | |
1664 | ||
1665 | ret = utils_create_pipe_cloexec(live_relay_cmd_pipe); | |
1666 | ||
1667 | return ret; | |
1668 | } | |
1669 | ||
1670 | void live_stop_threads() | |
1671 | { | |
1672 | int ret; | |
1673 | void *status; | |
1674 | ||
1675 | stop_threads(); | |
1676 | ||
1677 | ret = pthread_join(live_listener_thread, &status); | |
1678 | if (ret != 0) { | |
1679 | PERROR("pthread_join live listener"); | |
1680 | goto error; /* join error, exit without cleanup */ | |
1681 | } | |
1682 | ||
1683 | ret = pthread_join(live_worker_thread, &status); | |
1684 | if (ret != 0) { | |
1685 | PERROR("pthread_join live worker"); | |
1686 | goto error; /* join error, exit without cleanup */ | |
1687 | } | |
1688 | ||
1689 | ret = pthread_join(live_dispatcher_thread, &status); | |
1690 | if (ret != 0) { | |
1691 | PERROR("pthread_join live dispatcher"); | |
1692 | goto error; /* join error, exit without cleanup */ | |
1693 | } | |
1694 | ||
1695 | cleanup(); | |
1696 | ||
1697 | error: | |
1698 | return; | |
1699 | } | |
1700 | ||
1701 | /* | |
1702 | * main | |
1703 | */ | |
1704 | int live_start_threads(struct lttng_uri *uri, | |
42415026 | 1705 | struct relay_local_data *relay_ctx, int quit_pipe[2]) |
d3e2ba59 JD |
1706 | { |
1707 | int ret = 0; | |
1708 | void *status; | |
1709 | int is_root; | |
1710 | ||
1711 | assert(uri); | |
1712 | live_uri = uri; | |
1713 | ||
42415026 DG |
1714 | live_thread_quit_pipe[0] = quit_pipe[0]; |
1715 | live_thread_quit_pipe[1] = quit_pipe[1]; | |
d3e2ba59 JD |
1716 | |
1717 | /* Check if daemon is UID = 0 */ | |
1718 | is_root = !getuid(); | |
1719 | ||
1720 | if (!is_root) { | |
1721 | if (live_uri->port < 1024) { | |
1722 | ERR("Need to be root to use ports < 1024"); | |
1723 | ret = -1; | |
1724 | goto exit; | |
1725 | } | |
1726 | } | |
1727 | ||
1728 | /* Setup the thread apps communication pipe. */ | |
1729 | if ((ret = create_relay_cmd_pipe()) < 0) { | |
1730 | goto exit; | |
1731 | } | |
1732 | ||
1733 | /* Init relay command queue. */ | |
1734 | cds_wfq_init(&viewer_cmd_queue.queue); | |
1735 | ||
1736 | /* Set up max poll set size */ | |
1737 | lttng_poll_set_max_size(); | |
1738 | ||
1739 | /* Setup the dispatcher thread */ | |
1740 | ret = pthread_create(&live_dispatcher_thread, NULL, | |
1741 | thread_dispatcher, (void *) NULL); | |
1742 | if (ret != 0) { | |
1743 | PERROR("pthread_create viewer dispatcher"); | |
1744 | goto exit_dispatcher; | |
1745 | } | |
1746 | ||
1747 | /* Setup the worker thread */ | |
1748 | ret = pthread_create(&live_worker_thread, NULL, | |
1749 | thread_worker, relay_ctx); | |
1750 | if (ret != 0) { | |
1751 | PERROR("pthread_create viewer worker"); | |
1752 | goto exit_worker; | |
1753 | } | |
1754 | ||
1755 | /* Setup the listener thread */ | |
1756 | ret = pthread_create(&live_listener_thread, NULL, | |
1757 | thread_listener, (void *) NULL); | |
1758 | if (ret != 0) { | |
1759 | PERROR("pthread_create viewer listener"); | |
1760 | goto exit_listener; | |
1761 | } | |
1762 | ||
1763 | ret = 0; | |
1764 | goto end; | |
1765 | ||
1766 | exit_listener: | |
1767 | ret = pthread_join(live_listener_thread, &status); | |
1768 | if (ret != 0) { | |
1769 | PERROR("pthread_join live listener"); | |
1770 | goto error; /* join error, exit without cleanup */ | |
1771 | } | |
1772 | ||
1773 | exit_worker: | |
1774 | ret = pthread_join(live_worker_thread, &status); | |
1775 | if (ret != 0) { | |
1776 | PERROR("pthread_join live worker"); | |
1777 | goto error; /* join error, exit without cleanup */ | |
1778 | } | |
1779 | ||
1780 | exit_dispatcher: | |
1781 | ret = pthread_join(live_dispatcher_thread, &status); | |
1782 | if (ret != 0) { | |
1783 | PERROR("pthread_join live dispatcher"); | |
1784 | goto error; /* join error, exit without cleanup */ | |
1785 | } | |
1786 | ||
1787 | exit: | |
1788 | cleanup(); | |
1789 | ||
1790 | end: | |
1791 | error: | |
1792 | return ret; | |
1793 | } |