Commit | Line | Data |
---|---|---|
b8aa1682 JD |
1 | /* |
2 | * Copyright (C) 2012 - Julien Desfossez <jdesfossez@efficios.com> | |
3 | * David Goulet <dgoulet@efficios.com> | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of the GNU General Public License, version 2 only, | |
7 | * as published by the Free Software Foundation. | |
8 | * | |
9 | * This program is distributed in the hope that it will be useful, but WITHOUT | |
10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
12 | * more details. | |
13 | * | |
14 | * You should have received a copy of the GNU General Public License along | |
15 | * with this program; if not, write to the Free Software Foundation, Inc., | |
16 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
17 | */ | |
18 | ||
19 | #define _GNU_SOURCE | |
20 | #include <getopt.h> | |
21 | #include <grp.h> | |
22 | #include <limits.h> | |
23 | #include <pthread.h> | |
24 | #include <signal.h> | |
25 | #include <stdio.h> | |
26 | #include <stdlib.h> | |
27 | #include <string.h> | |
28 | #include <sys/mman.h> | |
29 | #include <sys/mount.h> | |
30 | #include <sys/resource.h> | |
31 | #include <sys/socket.h> | |
32 | #include <sys/stat.h> | |
33 | #include <sys/types.h> | |
34 | #include <sys/wait.h> | |
173af62f | 35 | #include <inttypes.h> |
b8aa1682 JD |
36 | #include <urcu/futex.h> |
37 | #include <urcu/uatomic.h> | |
38 | #include <unistd.h> | |
39 | #include <fcntl.h> | |
40 | #include <config.h> | |
41 | ||
42 | #include <lttng/lttng.h> | |
43 | #include <common/common.h> | |
44 | #include <common/compat/poll.h> | |
45 | #include <common/compat/socket.h> | |
46 | #include <common/defaults.h> | |
47 | #include <common/futex.h> | |
48 | #include <common/sessiond-comm/sessiond-comm.h> | |
49 | #include <common/sessiond-comm/inet.h> | |
50 | #include <common/hashtable/hashtable.h> | |
51 | #include <common/sessiond-comm/relayd.h> | |
52 | #include <common/uri.h> | |
a02de639 | 53 | #include <common/utils.h> |
b8aa1682 JD |
54 | |
55 | #include "lttng-relayd.h" | |
56 | ||
57 | /* command line options */ | |
58 | static int opt_daemon; | |
59 | static char *opt_output_path; | |
095a4ae5 MD |
60 | static struct lttng_uri *control_uri; |
61 | static struct lttng_uri *data_uri; | |
b8aa1682 JD |
62 | |
63 | const char *progname; | |
64 | static int is_root; /* Set to 1 if the daemon is running as root */ | |
65 | ||
66 | /* | |
67 | * Quit pipe for all threads. This permits a single cancellation point | |
68 | * for all threads when receiving an event on the pipe. | |
69 | */ | |
70 | static int thread_quit_pipe[2] = { -1, -1 }; | |
71 | ||
72 | /* | |
73 | * This pipe is used to inform the worker thread that a command is queued and | |
74 | * ready to be processed. | |
75 | */ | |
76 | static int relay_cmd_pipe[2] = { -1, -1 }; | |
77 | ||
26c9d55e | 78 | /* Shared between threads */ |
b8aa1682 JD |
79 | static int dispatch_thread_exit; |
80 | ||
81 | static pthread_t listener_thread; | |
82 | static pthread_t dispatcher_thread; | |
83 | static pthread_t worker_thread; | |
84 | ||
095a4ae5 MD |
85 | static uint64_t last_relay_stream_id; |
86 | static uint64_t last_relay_session_id; | |
b8aa1682 JD |
87 | |
88 | /* | |
89 | * Relay command queue. | |
90 | * | |
91 | * The relay_thread_listener and relay_thread_dispatcher communicate with this | |
92 | * queue. | |
93 | */ | |
94 | static struct relay_cmd_queue relay_cmd_queue; | |
95 | ||
96 | /* buffer allocated at startup, used to store the trace data */ | |
095a4ae5 MD |
97 | static char *data_buffer; |
98 | static unsigned int data_buffer_size; | |
b8aa1682 JD |
99 | |
100 | /* | |
101 | * usage function on stderr | |
102 | */ | |
103 | static | |
104 | void usage(void) | |
105 | { | |
106 | fprintf(stderr, "Usage: %s OPTIONS\n\nOptions:\n", progname); | |
107 | fprintf(stderr, " -h, --help Display this usage.\n"); | |
108 | fprintf(stderr, " -d, --daemonize Start as a daemon.\n"); | |
109 | fprintf(stderr, " -C, --control-port Control port listening (URI)\n"); | |
110 | fprintf(stderr, " -D, --data-port Data port listening (URI)\n"); | |
25672d02 | 111 | fprintf(stderr, " -o, --output Output path for traces (PATH)\n"); |
b8aa1682 JD |
112 | fprintf(stderr, " -v, --verbose Verbose mode. Activate DBG() macro.\n"); |
113 | } | |
114 | ||
115 | static | |
116 | int parse_args(int argc, char **argv) | |
117 | { | |
118 | int c; | |
119 | int ret = 0; | |
120 | char *default_address; | |
121 | ||
122 | static struct option long_options[] = { | |
e3678fd8 MD |
123 | { "control-port", 1, 0, 'C', }, |
124 | { "data-port", 1, 0, 'D', }, | |
125 | { "daemonize", 0, 0, 'd', }, | |
126 | { "help", 0, 0, 'h', }, | |
127 | { "output", 1, 0, 'o', }, | |
128 | { "verbose", 0, 0, 'v', }, | |
095a4ae5 | 129 | { NULL, 0, 0, 0, }, |
b8aa1682 JD |
130 | }; |
131 | ||
132 | while (1) { | |
133 | int option_index = 0; | |
134 | c = getopt_long(argc, argv, "dhv" "C:D:o:", | |
135 | long_options, &option_index); | |
136 | if (c == -1) { | |
137 | break; | |
138 | } | |
139 | ||
140 | switch (c) { | |
141 | case 0: | |
142 | fprintf(stderr, "option %s", long_options[option_index].name); | |
143 | if (optarg) { | |
144 | fprintf(stderr, " with arg %s\n", optarg); | |
145 | } | |
146 | break; | |
147 | case 'C': | |
148 | ret = uri_parse(optarg, &control_uri); | |
149 | if (ret < 0) { | |
150 | ERR("Invalid control URI specified"); | |
151 | goto exit; | |
152 | } | |
153 | if (control_uri->port == 0) { | |
154 | control_uri->port = DEFAULT_NETWORK_CONTROL_PORT; | |
155 | } | |
156 | break; | |
157 | case 'D': | |
158 | ret = uri_parse(optarg, &data_uri); | |
159 | if (ret < 0) { | |
160 | ERR("Invalid data URI specified"); | |
161 | goto exit; | |
162 | } | |
163 | if (data_uri->port == 0) { | |
164 | data_uri->port = DEFAULT_NETWORK_DATA_PORT; | |
165 | } | |
166 | break; | |
167 | case 'd': | |
168 | opt_daemon = 1; | |
169 | break; | |
170 | case 'h': | |
171 | usage(); | |
172 | exit(EXIT_FAILURE); | |
173 | case 'o': | |
174 | ret = asprintf(&opt_output_path, "%s", optarg); | |
175 | if (ret < 0) { | |
176 | PERROR("asprintf opt_output_path"); | |
177 | goto exit; | |
178 | } | |
179 | break; | |
180 | case 'v': | |
181 | /* Verbose level can increase using multiple -v */ | |
182 | lttng_opt_verbose += 1; | |
183 | break; | |
184 | default: | |
185 | /* Unknown option or other error. | |
186 | * Error is printed by getopt, just return */ | |
187 | ret = -1; | |
188 | goto exit; | |
189 | } | |
190 | } | |
191 | ||
192 | /* assign default values */ | |
193 | if (control_uri == NULL) { | |
194 | ret = asprintf(&default_address, "tcp://0.0.0.0:%d", | |
195 | DEFAULT_NETWORK_CONTROL_PORT); | |
196 | if (ret < 0) { | |
197 | PERROR("asprintf default data address"); | |
198 | goto exit; | |
199 | } | |
200 | ||
201 | ret = uri_parse(default_address, &control_uri); | |
202 | free(default_address); | |
203 | if (ret < 0) { | |
204 | ERR("Invalid control URI specified"); | |
205 | goto exit; | |
206 | } | |
207 | } | |
208 | if (data_uri == NULL) { | |
209 | ret = asprintf(&default_address, "tcp://0.0.0.0:%d", | |
210 | DEFAULT_NETWORK_DATA_PORT); | |
211 | if (ret < 0) { | |
212 | PERROR("asprintf default data address"); | |
213 | goto exit; | |
214 | } | |
215 | ||
216 | ret = uri_parse(default_address, &data_uri); | |
217 | free(default_address); | |
218 | if (ret < 0) { | |
219 | ERR("Invalid data URI specified"); | |
220 | goto exit; | |
221 | } | |
222 | } | |
223 | ||
224 | exit: | |
225 | return ret; | |
226 | } | |
227 | ||
228 | /* | |
229 | * Cleanup the daemon | |
230 | */ | |
231 | static | |
232 | void cleanup(void) | |
233 | { | |
b8aa1682 JD |
234 | DBG("Cleaning up"); |
235 | ||
095a4ae5 MD |
236 | /* free the dynamically allocated opt_output_path */ |
237 | free(opt_output_path); | |
238 | ||
a02de639 CB |
239 | /* Close thread quit pipes */ |
240 | utils_close_pipe(thread_quit_pipe); | |
241 | ||
710c1f73 DG |
242 | uri_free(control_uri); |
243 | uri_free(data_uri); | |
b8aa1682 JD |
244 | } |
245 | ||
246 | /* | |
247 | * Write to writable pipe used to notify a thread. | |
248 | */ | |
249 | static | |
250 | int notify_thread_pipe(int wpipe) | |
251 | { | |
252 | int ret; | |
253 | ||
6f94560a MD |
254 | do { |
255 | ret = write(wpipe, "!", 1); | |
256 | } while (ret < 0 && errno == EINTR); | |
b8aa1682 JD |
257 | if (ret < 0) { |
258 | PERROR("write poll pipe"); | |
259 | } | |
260 | ||
261 | return ret; | |
262 | } | |
263 | ||
264 | /* | |
265 | * Stop all threads by closing the thread quit pipe. | |
266 | */ | |
267 | static | |
268 | void stop_threads(void) | |
269 | { | |
270 | int ret; | |
271 | ||
272 | /* Stopping all threads */ | |
273 | DBG("Terminating all threads"); | |
274 | ret = notify_thread_pipe(thread_quit_pipe[1]); | |
275 | if (ret < 0) { | |
276 | ERR("write error on thread quit pipe"); | |
277 | } | |
278 | ||
279 | /* Dispatch thread */ | |
26c9d55e | 280 | CMM_STORE_SHARED(dispatch_thread_exit, 1); |
b8aa1682 JD |
281 | futex_nto1_wake(&relay_cmd_queue.futex); |
282 | } | |
283 | ||
284 | /* | |
285 | * Signal handler for the daemon | |
286 | * | |
287 | * Simply stop all worker threads, leaving main() return gracefully after | |
288 | * joining all threads and calling cleanup(). | |
289 | */ | |
290 | static | |
291 | void sighandler(int sig) | |
292 | { | |
293 | switch (sig) { | |
294 | case SIGPIPE: | |
295 | DBG("SIGPIPE caught"); | |
296 | return; | |
297 | case SIGINT: | |
298 | DBG("SIGINT caught"); | |
299 | stop_threads(); | |
300 | break; | |
301 | case SIGTERM: | |
302 | DBG("SIGTERM caught"); | |
303 | stop_threads(); | |
304 | break; | |
305 | default: | |
306 | break; | |
307 | } | |
308 | } | |
309 | ||
310 | /* | |
311 | * Setup signal handler for : | |
312 | * SIGINT, SIGTERM, SIGPIPE | |
313 | */ | |
314 | static | |
315 | int set_signal_handler(void) | |
316 | { | |
317 | int ret = 0; | |
318 | struct sigaction sa; | |
319 | sigset_t sigset; | |
320 | ||
321 | if ((ret = sigemptyset(&sigset)) < 0) { | |
322 | PERROR("sigemptyset"); | |
323 | return ret; | |
324 | } | |
325 | ||
326 | sa.sa_handler = sighandler; | |
327 | sa.sa_mask = sigset; | |
328 | sa.sa_flags = 0; | |
329 | if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) { | |
330 | PERROR("sigaction"); | |
331 | return ret; | |
332 | } | |
333 | ||
334 | if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) { | |
335 | PERROR("sigaction"); | |
336 | return ret; | |
337 | } | |
338 | ||
339 | if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) { | |
340 | PERROR("sigaction"); | |
341 | return ret; | |
342 | } | |
343 | ||
344 | DBG("Signal handler set for SIGTERM, SIGPIPE and SIGINT"); | |
345 | ||
346 | return ret; | |
347 | } | |
348 | ||
349 | /* | |
350 | * Init thread quit pipe. | |
351 | * | |
352 | * Return -1 on error or 0 if all pipes are created. | |
353 | */ | |
354 | static | |
355 | int init_thread_quit_pipe(void) | |
356 | { | |
a02de639 | 357 | int ret; |
b8aa1682 | 358 | |
a02de639 | 359 | ret = utils_create_pipe_cloexec(thread_quit_pipe); |
b8aa1682 | 360 | |
b8aa1682 JD |
361 | return ret; |
362 | } | |
363 | ||
364 | /* | |
365 | * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set. | |
366 | */ | |
367 | static | |
368 | int create_thread_poll_set(struct lttng_poll_event *events, int size) | |
369 | { | |
370 | int ret; | |
371 | ||
372 | if (events == NULL || size == 0) { | |
373 | ret = -1; | |
374 | goto error; | |
375 | } | |
376 | ||
377 | ret = lttng_poll_create(events, size, LTTNG_CLOEXEC); | |
378 | if (ret < 0) { | |
379 | goto error; | |
380 | } | |
381 | ||
382 | /* Add quit pipe */ | |
383 | ret = lttng_poll_add(events, thread_quit_pipe[0], LPOLLIN); | |
384 | if (ret < 0) { | |
385 | goto error; | |
386 | } | |
387 | ||
388 | return 0; | |
389 | ||
390 | error: | |
391 | return ret; | |
392 | } | |
393 | ||
394 | /* | |
395 | * Check if the thread quit pipe was triggered. | |
396 | * | |
397 | * Return 1 if it was triggered else 0; | |
398 | */ | |
399 | static | |
400 | int check_thread_quit_pipe(int fd, uint32_t events) | |
401 | { | |
402 | if (fd == thread_quit_pipe[0] && (events & LPOLLIN)) { | |
403 | return 1; | |
404 | } | |
405 | ||
406 | return 0; | |
407 | } | |
408 | ||
409 | /* | |
410 | * Create and init socket from uri. | |
411 | */ | |
412 | static | |
413 | struct lttcomm_sock *relay_init_sock(struct lttng_uri *uri) | |
414 | { | |
415 | int ret; | |
416 | struct lttcomm_sock *sock = NULL; | |
417 | ||
418 | sock = lttcomm_alloc_sock_from_uri(uri); | |
419 | if (sock == NULL) { | |
420 | ERR("Allocating socket"); | |
421 | goto error; | |
422 | } | |
423 | ||
424 | ret = lttcomm_create_sock(sock); | |
425 | if (ret < 0) { | |
426 | goto error; | |
427 | } | |
428 | DBG("Listening on sock %d", sock->fd); | |
429 | ||
430 | ret = sock->ops->bind(sock); | |
431 | if (ret < 0) { | |
432 | goto error; | |
433 | } | |
434 | ||
435 | ret = sock->ops->listen(sock, -1); | |
436 | if (ret < 0) { | |
437 | goto error; | |
438 | ||
439 | } | |
440 | ||
441 | return sock; | |
442 | ||
443 | error: | |
444 | if (sock) { | |
445 | lttcomm_destroy_sock(sock); | |
446 | } | |
447 | return NULL; | |
448 | } | |
449 | ||
173af62f DG |
450 | /* |
451 | * Return nonzero if stream needs to be closed. | |
452 | */ | |
453 | static | |
454 | int close_stream_check(struct relay_stream *stream) | |
455 | { | |
456 | ||
457 | if (stream->close_flag && stream->prev_seq == stream->last_net_seq_num) { | |
f7079f67 DG |
458 | /* |
459 | * We are about to close the stream so set the data pending flag to 1 | |
460 | * which will make the end data pending command skip the stream which | |
461 | * is now closed and ready. Note that after proceeding to a file close, | |
462 | * the written file is ready for reading. | |
463 | */ | |
464 | stream->data_pending_check_done = 1; | |
173af62f DG |
465 | return 1; |
466 | } | |
467 | return 0; | |
468 | } | |
469 | ||
b8aa1682 JD |
470 | /* |
471 | * This thread manages the listening for new connections on the network | |
472 | */ | |
473 | static | |
474 | void *relay_thread_listener(void *data) | |
475 | { | |
095a4ae5 | 476 | int i, ret, pollfd, err = -1; |
b8aa1682 JD |
477 | int val = 1; |
478 | uint32_t revents, nb_fd; | |
479 | struct lttng_poll_event events; | |
480 | struct lttcomm_sock *control_sock, *data_sock; | |
481 | ||
b8aa1682 JD |
482 | DBG("[thread] Relay listener started"); |
483 | ||
484 | control_sock = relay_init_sock(control_uri); | |
485 | if (!control_sock) { | |
095a4ae5 | 486 | goto error_sock_control; |
b8aa1682 JD |
487 | } |
488 | ||
489 | data_sock = relay_init_sock(data_uri); | |
490 | if (!data_sock) { | |
095a4ae5 | 491 | goto error_sock_relay; |
b8aa1682 JD |
492 | } |
493 | ||
494 | /* | |
495 | * Pass 3 as size here for the thread quit pipe, control and data socket. | |
496 | */ | |
497 | ret = create_thread_poll_set(&events, 3); | |
498 | if (ret < 0) { | |
499 | goto error_create_poll; | |
500 | } | |
501 | ||
502 | /* Add the control socket */ | |
503 | ret = lttng_poll_add(&events, control_sock->fd, LPOLLIN | LPOLLRDHUP); | |
504 | if (ret < 0) { | |
505 | goto error_poll_add; | |
506 | } | |
507 | ||
508 | /* Add the data socket */ | |
509 | ret = lttng_poll_add(&events, data_sock->fd, LPOLLIN | LPOLLRDHUP); | |
510 | if (ret < 0) { | |
511 | goto error_poll_add; | |
512 | } | |
513 | ||
514 | while (1) { | |
515 | DBG("Listener accepting connections"); | |
516 | ||
b8aa1682 JD |
517 | restart: |
518 | ret = lttng_poll_wait(&events, -1); | |
519 | if (ret < 0) { | |
520 | /* | |
521 | * Restart interrupted system call. | |
522 | */ | |
523 | if (errno == EINTR) { | |
524 | goto restart; | |
525 | } | |
526 | goto error; | |
527 | } | |
528 | ||
0d9c5d77 DG |
529 | nb_fd = ret; |
530 | ||
b8aa1682 JD |
531 | DBG("Relay new connection received"); |
532 | for (i = 0; i < nb_fd; i++) { | |
533 | /* Fetch once the poll data */ | |
534 | revents = LTTNG_POLL_GETEV(&events, i); | |
535 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
536 | ||
537 | /* Thread quit pipe has been closed. Killing thread. */ | |
538 | ret = check_thread_quit_pipe(pollfd, revents); | |
539 | if (ret) { | |
095a4ae5 MD |
540 | err = 0; |
541 | goto exit; | |
b8aa1682 JD |
542 | } |
543 | ||
544 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
545 | ERR("socket poll error"); | |
546 | goto error; | |
547 | } else if (revents & LPOLLIN) { | |
4b7f17b2 MD |
548 | /* |
549 | * Get allocated in this thread, | |
550 | * enqueued to a global queue, dequeued | |
551 | * and freed in the worker thread. | |
552 | */ | |
553 | struct relay_command *relay_cmd; | |
554 | struct lttcomm_sock *newsock; | |
b8aa1682 JD |
555 | |
556 | relay_cmd = zmalloc(sizeof(struct relay_command)); | |
557 | if (relay_cmd == NULL) { | |
558 | PERROR("relay command zmalloc"); | |
559 | goto error; | |
560 | } | |
561 | ||
562 | if (pollfd == data_sock->fd) { | |
563 | newsock = data_sock->ops->accept(data_sock); | |
4b7f17b2 | 564 | if (!newsock) { |
b8aa1682 | 565 | PERROR("accepting data sock"); |
4b7f17b2 | 566 | free(relay_cmd); |
b8aa1682 JD |
567 | goto error; |
568 | } | |
569 | relay_cmd->type = RELAY_DATA; | |
570 | DBG("Relay data connection accepted, socket %d", newsock->fd); | |
4b7f17b2 MD |
571 | } else { |
572 | assert(pollfd == control_sock->fd); | |
b8aa1682 | 573 | newsock = control_sock->ops->accept(control_sock); |
4b7f17b2 | 574 | if (!newsock) { |
b8aa1682 | 575 | PERROR("accepting control sock"); |
4b7f17b2 | 576 | free(relay_cmd); |
b8aa1682 JD |
577 | goto error; |
578 | } | |
579 | relay_cmd->type = RELAY_CONTROL; | |
580 | DBG("Relay control connection accepted, socket %d", newsock->fd); | |
581 | } | |
582 | ret = setsockopt(newsock->fd, SOL_SOCKET, SO_REUSEADDR, | |
583 | &val, sizeof(int)); | |
584 | if (ret < 0) { | |
585 | PERROR("setsockopt inet"); | |
4b7f17b2 MD |
586 | lttcomm_destroy_sock(newsock); |
587 | free(relay_cmd); | |
b8aa1682 JD |
588 | goto error; |
589 | } | |
590 | relay_cmd->sock = newsock; | |
591 | /* | |
592 | * Lock free enqueue the request. | |
593 | */ | |
594 | cds_wfq_enqueue(&relay_cmd_queue.queue, &relay_cmd->node); | |
595 | ||
596 | /* | |
597 | * Wake the dispatch queue futex. Implicit memory | |
598 | * barrier with the exchange in cds_wfq_enqueue. | |
599 | */ | |
600 | futex_nto1_wake(&relay_cmd_queue.futex); | |
601 | } | |
602 | } | |
603 | } | |
604 | ||
095a4ae5 | 605 | exit: |
b8aa1682 JD |
606 | error: |
607 | error_poll_add: | |
608 | lttng_poll_clean(&events); | |
609 | error_create_poll: | |
095a4ae5 MD |
610 | if (data_sock->fd >= 0) { |
611 | ret = data_sock->ops->close(data_sock); | |
b8aa1682 JD |
612 | if (ret) { |
613 | PERROR("close"); | |
614 | } | |
b8aa1682 | 615 | } |
095a4ae5 MD |
616 | lttcomm_destroy_sock(data_sock); |
617 | error_sock_relay: | |
618 | if (control_sock->fd >= 0) { | |
619 | ret = control_sock->ops->close(control_sock); | |
b8aa1682 JD |
620 | if (ret) { |
621 | PERROR("close"); | |
622 | } | |
b8aa1682 | 623 | } |
095a4ae5 MD |
624 | lttcomm_destroy_sock(control_sock); |
625 | error_sock_control: | |
626 | if (err) { | |
627 | DBG("Thread exited with error"); | |
628 | } | |
b8aa1682 JD |
629 | DBG("Relay listener thread cleanup complete"); |
630 | stop_threads(); | |
b8aa1682 JD |
631 | return NULL; |
632 | } | |
633 | ||
634 | /* | |
635 | * This thread manages the dispatching of the requests to worker threads | |
636 | */ | |
637 | static | |
638 | void *relay_thread_dispatcher(void *data) | |
639 | { | |
640 | int ret; | |
641 | struct cds_wfq_node *node; | |
642 | struct relay_command *relay_cmd = NULL; | |
643 | ||
644 | DBG("[thread] Relay dispatcher started"); | |
645 | ||
26c9d55e | 646 | while (!CMM_LOAD_SHARED(dispatch_thread_exit)) { |
b8aa1682 JD |
647 | /* Atomically prepare the queue futex */ |
648 | futex_nto1_prepare(&relay_cmd_queue.futex); | |
649 | ||
650 | do { | |
651 | /* Dequeue commands */ | |
652 | node = cds_wfq_dequeue_blocking(&relay_cmd_queue.queue); | |
653 | if (node == NULL) { | |
654 | DBG("Woken up but nothing in the relay command queue"); | |
655 | /* Continue thread execution */ | |
656 | break; | |
657 | } | |
658 | ||
659 | relay_cmd = caa_container_of(node, struct relay_command, node); | |
660 | DBG("Dispatching request waiting on sock %d", relay_cmd->sock->fd); | |
661 | ||
662 | /* | |
663 | * Inform worker thread of the new request. This | |
664 | * call is blocking so we can be assured that the data will be read | |
665 | * at some point in time or wait to the end of the world :) | |
666 | */ | |
6f94560a MD |
667 | do { |
668 | ret = write(relay_cmd_pipe[1], relay_cmd, | |
669 | sizeof(struct relay_command)); | |
670 | } while (ret < 0 && errno == EINTR); | |
b8aa1682 JD |
671 | free(relay_cmd); |
672 | if (ret < 0) { | |
673 | PERROR("write cmd pipe"); | |
674 | goto error; | |
675 | } | |
676 | } while (node != NULL); | |
677 | ||
678 | /* Futex wait on queue. Blocking call on futex() */ | |
679 | futex_nto1_wait(&relay_cmd_queue.futex); | |
680 | } | |
681 | ||
682 | error: | |
683 | DBG("Dispatch thread dying"); | |
684 | stop_threads(); | |
685 | return NULL; | |
686 | } | |
687 | ||
688 | /* | |
689 | * Return the realpath(3) of the path even if the last directory token does not | |
690 | * exist. For example, with /tmp/test1/test2, if test2/ does not exist but the | |
691 | * /tmp/test1 does, the real path is returned. In normal time, realpath(3) | |
692 | * fails if the end point directory does not exist. | |
693 | */ | |
694 | static | |
695 | char *expand_full_path(const char *path) | |
696 | { | |
697 | const char *end_path = path; | |
095a4ae5 | 698 | char *next, *cut_path, *expanded_path, *respath; |
b8aa1682 JD |
699 | |
700 | /* Find last token delimited by '/' */ | |
701 | while ((next = strpbrk(end_path + 1, "/"))) { | |
702 | end_path = next; | |
703 | } | |
704 | ||
705 | /* Cut last token from original path */ | |
706 | cut_path = strndup(path, end_path - path); | |
707 | ||
708 | expanded_path = malloc(PATH_MAX); | |
709 | if (expanded_path == NULL) { | |
095a4ae5 MD |
710 | respath = NULL; |
711 | goto end; | |
b8aa1682 JD |
712 | } |
713 | ||
095a4ae5 MD |
714 | respath = realpath(cut_path, expanded_path); |
715 | if (respath == NULL) { | |
b8aa1682 JD |
716 | switch (errno) { |
717 | case ENOENT: | |
718 | ERR("%s: No such file or directory", cut_path); | |
719 | break; | |
720 | default: | |
721 | PERROR("realpath"); | |
722 | break; | |
723 | } | |
095a4ae5 MD |
724 | free(expanded_path); |
725 | } else { | |
726 | /* Add end part to expanded path */ | |
727 | strcat(respath, end_path); | |
b8aa1682 | 728 | } |
095a4ae5 | 729 | end: |
b8aa1682 | 730 | free(cut_path); |
095a4ae5 | 731 | return respath; |
b8aa1682 JD |
732 | } |
733 | ||
734 | ||
735 | /* | |
736 | * config_get_default_path | |
737 | * | |
738 | * Returns the HOME directory path. Caller MUST NOT free(3) the return pointer. | |
739 | */ | |
740 | static | |
741 | char *config_get_default_path(void) | |
742 | { | |
743 | return getenv("HOME"); | |
744 | } | |
745 | ||
746 | /* | |
747 | * Create recursively directory using the FULL path. | |
748 | */ | |
749 | static | |
750 | int mkdir_recursive(char *path, mode_t mode) | |
751 | { | |
752 | char *p, tmp[PATH_MAX]; | |
753 | struct stat statbuf; | |
754 | size_t len; | |
755 | int ret; | |
756 | ||
757 | ret = snprintf(tmp, sizeof(tmp), "%s", path); | |
758 | if (ret < 0) { | |
759 | PERROR("snprintf mkdir"); | |
760 | goto error; | |
761 | } | |
762 | ||
763 | len = ret; | |
764 | if (tmp[len - 1] == '/') { | |
765 | tmp[len - 1] = 0; | |
766 | } | |
767 | ||
768 | for (p = tmp + 1; *p; p++) { | |
769 | if (*p == '/') { | |
770 | *p = 0; | |
771 | if (tmp[strlen(tmp) - 1] == '.' && | |
772 | tmp[strlen(tmp) - 2] == '.' && | |
773 | tmp[strlen(tmp) - 3] == '/') { | |
774 | ERR("Using '/../' is not permitted in the trace path (%s)", | |
775 | tmp); | |
776 | ret = -1; | |
777 | goto error; | |
778 | } | |
779 | ret = stat(tmp, &statbuf); | |
780 | if (ret < 0) { | |
781 | ret = mkdir(tmp, mode); | |
782 | if (ret < 0) { | |
095a4ae5 | 783 | if (errno != EEXIST) { |
b8aa1682 JD |
784 | PERROR("mkdir recursive"); |
785 | ret = -errno; | |
786 | goto error; | |
787 | } | |
788 | } | |
789 | } | |
790 | *p = '/'; | |
791 | } | |
792 | } | |
793 | ||
794 | ret = mkdir(tmp, mode); | |
795 | if (ret < 0) { | |
095a4ae5 | 796 | if (errno != EEXIST) { |
b8aa1682 JD |
797 | PERROR("mkdir recursive last piece"); |
798 | ret = -errno; | |
799 | } else { | |
800 | ret = 0; | |
801 | } | |
802 | } | |
803 | ||
804 | error: | |
805 | return ret; | |
806 | } | |
807 | ||
b8aa1682 | 808 | static |
095a4ae5 | 809 | char *create_output_path_auto(char *path_name) |
b8aa1682 | 810 | { |
095a4ae5 | 811 | int ret; |
b8aa1682 | 812 | char *traces_path = NULL; |
095a4ae5 MD |
813 | char *alloc_path = NULL; |
814 | char *default_path; | |
b8aa1682 | 815 | |
095a4ae5 MD |
816 | default_path = config_get_default_path(); |
817 | if (default_path == NULL) { | |
818 | ERR("Home path not found.\n \ | |
819 | Please specify an output path using -o, --output PATH"); | |
820 | goto exit; | |
821 | } | |
822 | alloc_path = strdup(default_path); | |
823 | if (alloc_path == NULL) { | |
824 | PERROR("Path allocation"); | |
825 | goto exit; | |
826 | } | |
827 | ret = asprintf(&traces_path, "%s/" DEFAULT_TRACE_DIR_NAME | |
828 | "/%s", alloc_path, path_name); | |
829 | if (ret < 0) { | |
830 | PERROR("asprintf trace dir name"); | |
831 | goto exit; | |
b8aa1682 | 832 | } |
095a4ae5 | 833 | exit: |
b8aa1682 | 834 | free(alloc_path); |
095a4ae5 MD |
835 | return traces_path; |
836 | } | |
837 | ||
838 | static | |
839 | char *create_output_path_noauto(char *path_name) | |
840 | { | |
841 | int ret; | |
842 | char *traces_path = NULL; | |
843 | char *full_path; | |
b8aa1682 | 844 | |
095a4ae5 MD |
845 | full_path = expand_full_path(opt_output_path); |
846 | ret = asprintf(&traces_path, "%s/%s", full_path, path_name); | |
847 | if (ret < 0) { | |
848 | PERROR("asprintf trace dir name"); | |
849 | goto exit; | |
850 | } | |
b8aa1682 | 851 | exit: |
095a4ae5 | 852 | free(full_path); |
b8aa1682 JD |
853 | return traces_path; |
854 | } | |
855 | ||
095a4ae5 MD |
856 | /* |
857 | * create_output_path: create the output trace directory | |
858 | */ | |
859 | static | |
860 | char *create_output_path(char *path_name) | |
861 | { | |
862 | if (opt_output_path == NULL) { | |
863 | return create_output_path_auto(path_name); | |
864 | } else { | |
865 | return create_output_path_noauto(path_name); | |
866 | } | |
867 | } | |
868 | ||
9d1bbf21 MD |
869 | static |
870 | void deferred_free_stream(struct rcu_head *head) | |
871 | { | |
872 | struct relay_stream *stream = | |
873 | caa_container_of(head, struct relay_stream, rcu_node); | |
874 | free(stream); | |
875 | } | |
876 | ||
b8aa1682 JD |
877 | /* |
878 | * relay_delete_session: Free all memory associated with a session and | |
879 | * close all the FDs | |
880 | */ | |
881 | static | |
882 | void relay_delete_session(struct relay_command *cmd, struct lttng_ht *streams_ht) | |
883 | { | |
884 | struct lttng_ht_iter iter; | |
885 | struct lttng_ht_node_ulong *node; | |
886 | struct relay_stream *stream; | |
887 | int ret; | |
888 | ||
095a4ae5 | 889 | if (!cmd->session) { |
b8aa1682 | 890 | return; |
095a4ae5 | 891 | } |
b8aa1682 | 892 | |
77c7c900 | 893 | DBG("Relay deleting session %" PRIu64, cmd->session->id); |
5b6d8097 | 894 | |
9d1bbf21 | 895 | rcu_read_lock(); |
b8aa1682 JD |
896 | cds_lfht_for_each_entry(streams_ht->ht, &iter.iter, node, node) { |
897 | node = lttng_ht_iter_get_node_ulong(&iter); | |
898 | if (node) { | |
899 | stream = caa_container_of(node, | |
900 | struct relay_stream, stream_n); | |
901 | if (stream->session == cmd->session) { | |
f66c074c DG |
902 | ret = close(stream->fd); |
903 | if (ret < 0) { | |
904 | PERROR("close stream fd on delete session"); | |
905 | } | |
b8aa1682 JD |
906 | ret = lttng_ht_del(streams_ht, &iter); |
907 | assert(!ret); | |
9d1bbf21 MD |
908 | call_rcu(&stream->rcu_node, |
909 | deferred_free_stream); | |
b8aa1682 JD |
910 | } |
911 | } | |
912 | } | |
9d1bbf21 | 913 | rcu_read_unlock(); |
5b6d8097 DG |
914 | |
915 | free(cmd->session); | |
b8aa1682 JD |
916 | } |
917 | ||
c5b6f4f0 DG |
918 | /* |
919 | * Handle the RELAYD_CREATE_SESSION command. | |
920 | * | |
921 | * On success, send back the session id or else return a negative value. | |
922 | */ | |
923 | static | |
924 | int relay_create_session(struct lttcomm_relayd_hdr *recv_hdr, | |
925 | struct relay_command *cmd) | |
926 | { | |
927 | int ret = 0, send_ret; | |
928 | struct relay_session *session; | |
929 | struct lttcomm_relayd_status_session reply; | |
930 | ||
931 | assert(recv_hdr); | |
932 | assert(cmd); | |
933 | ||
934 | memset(&reply, 0, sizeof(reply)); | |
935 | ||
936 | session = zmalloc(sizeof(struct relay_session)); | |
937 | if (session == NULL) { | |
938 | PERROR("relay session zmalloc"); | |
939 | ret = -1; | |
940 | goto error; | |
941 | } | |
942 | ||
943 | session->id = ++last_relay_session_id; | |
944 | session->sock = cmd->sock; | |
945 | cmd->session = session; | |
946 | ||
947 | reply.session_id = htobe64(session->id); | |
948 | ||
949 | DBG("Created session %" PRIu64, session->id); | |
950 | ||
951 | error: | |
952 | if (ret < 0) { | |
953 | reply.ret_code = htobe32(LTTNG_ERR_FATAL); | |
954 | } else { | |
955 | reply.ret_code = htobe32(LTTNG_OK); | |
956 | } | |
957 | ||
958 | send_ret = cmd->sock->ops->sendmsg(cmd->sock, &reply, sizeof(reply), 0); | |
959 | if (send_ret < 0) { | |
960 | ERR("Relayd sending session id"); | |
961 | } | |
962 | ||
963 | return ret; | |
964 | } | |
965 | ||
b8aa1682 JD |
966 | /* |
967 | * relay_add_stream: allocate a new stream for a session | |
968 | */ | |
969 | static | |
970 | int relay_add_stream(struct lttcomm_relayd_hdr *recv_hdr, | |
971 | struct relay_command *cmd, struct lttng_ht *streams_ht) | |
972 | { | |
973 | struct relay_session *session = cmd->session; | |
974 | struct lttcomm_relayd_add_stream stream_info; | |
975 | struct relay_stream *stream = NULL; | |
976 | struct lttcomm_relayd_status_stream reply; | |
977 | char *path = NULL, *root_path = NULL; | |
978 | int ret, send_ret; | |
979 | ||
c5b6f4f0 | 980 | if (!session || cmd->version_check_done == 0) { |
b8aa1682 JD |
981 | ERR("Trying to add a stream before version check"); |
982 | ret = -1; | |
983 | goto end_no_session; | |
984 | } | |
985 | ||
986 | /* FIXME : use data_size for something ? */ | |
987 | ret = cmd->sock->ops->recvmsg(cmd->sock, &stream_info, | |
7c5aef62 | 988 | sizeof(struct lttcomm_relayd_add_stream), 0); |
b8aa1682 JD |
989 | if (ret < sizeof(struct lttcomm_relayd_add_stream)) { |
990 | ERR("Relay didn't receive valid add_stream struct size : %d", ret); | |
991 | ret = -1; | |
992 | goto end_no_session; | |
993 | } | |
994 | stream = zmalloc(sizeof(struct relay_stream)); | |
995 | if (stream == NULL) { | |
996 | PERROR("relay stream zmalloc"); | |
997 | ret = -1; | |
998 | goto end_no_session; | |
999 | } | |
1000 | ||
9d1bbf21 | 1001 | rcu_read_lock(); |
b8aa1682 | 1002 | stream->stream_handle = ++last_relay_stream_id; |
173af62f | 1003 | stream->prev_seq = -1ULL; |
b8aa1682 JD |
1004 | stream->session = session; |
1005 | ||
1006 | root_path = create_output_path(stream_info.pathname); | |
1007 | if (!root_path) { | |
1008 | ret = -1; | |
1009 | goto end; | |
1010 | } | |
1011 | ret = mkdir_recursive(root_path, S_IRWXU | S_IRWXG); | |
1012 | if (ret < 0) { | |
b8aa1682 JD |
1013 | ERR("relay creating output directory"); |
1014 | goto end; | |
1015 | } | |
1016 | ||
1017 | ret = asprintf(&path, "%s/%s", root_path, stream_info.channel_name); | |
1018 | if (ret < 0) { | |
1019 | PERROR("asprintf stream path"); | |
1020 | goto end; | |
1021 | } | |
1022 | ||
1023 | ret = open(path, O_WRONLY|O_CREAT|O_TRUNC, S_IRWXU|S_IRWXG|S_IRWXO); | |
1024 | if (ret < 0) { | |
1025 | PERROR("Relay creating trace file"); | |
1026 | goto end; | |
1027 | } | |
1028 | ||
1029 | stream->fd = ret; | |
1030 | DBG("Tracefile %s created", path); | |
1031 | ||
1032 | lttng_ht_node_init_ulong(&stream->stream_n, | |
1033 | (unsigned long) stream->stream_handle); | |
1034 | lttng_ht_add_unique_ulong(streams_ht, | |
1035 | &stream->stream_n); | |
1036 | ||
1037 | DBG("Relay new stream added %s", stream_info.channel_name); | |
1038 | ||
1039 | end: | |
1040 | free(path); | |
1041 | free(root_path); | |
1042 | /* send the session id to the client or a negative return code on error */ | |
1043 | if (ret < 0) { | |
f73fabfd | 1044 | reply.ret_code = htobe32(LTTNG_ERR_UNK); |
b8aa1682 | 1045 | } else { |
f73fabfd | 1046 | reply.ret_code = htobe32(LTTNG_OK); |
b8aa1682 JD |
1047 | } |
1048 | reply.handle = htobe64(stream->stream_handle); | |
1049 | send_ret = cmd->sock->ops->sendmsg(cmd->sock, &reply, | |
1050 | sizeof(struct lttcomm_relayd_status_stream), 0); | |
1051 | if (send_ret < 0) { | |
1052 | ERR("Relay sending stream id"); | |
1053 | } | |
9d1bbf21 | 1054 | rcu_read_unlock(); |
b8aa1682 JD |
1055 | |
1056 | end_no_session: | |
1057 | return ret; | |
1058 | } | |
1059 | ||
173af62f DG |
1060 | /* |
1061 | * relay_close_stream: close a specific stream | |
1062 | */ | |
1063 | static | |
1064 | int relay_close_stream(struct lttcomm_relayd_hdr *recv_hdr, | |
1065 | struct relay_command *cmd, struct lttng_ht *streams_ht) | |
1066 | { | |
1067 | struct relay_session *session = cmd->session; | |
1068 | struct lttcomm_relayd_close_stream stream_info; | |
1069 | struct lttcomm_relayd_generic_reply reply; | |
1070 | struct relay_stream *stream; | |
1071 | int ret, send_ret; | |
1072 | struct lttng_ht_node_ulong *node; | |
1073 | struct lttng_ht_iter iter; | |
1074 | ||
1075 | DBG("Close stream received"); | |
1076 | ||
c5b6f4f0 | 1077 | if (!session || cmd->version_check_done == 0) { |
173af62f DG |
1078 | ERR("Trying to close a stream before version check"); |
1079 | ret = -1; | |
1080 | goto end_no_session; | |
1081 | } | |
1082 | ||
1083 | ret = cmd->sock->ops->recvmsg(cmd->sock, &stream_info, | |
7c5aef62 | 1084 | sizeof(struct lttcomm_relayd_close_stream), 0); |
173af62f DG |
1085 | if (ret < sizeof(struct lttcomm_relayd_close_stream)) { |
1086 | ERR("Relay didn't receive valid add_stream struct size : %d", ret); | |
1087 | ret = -1; | |
1088 | goto end_no_session; | |
1089 | } | |
1090 | ||
1091 | rcu_read_lock(); | |
1092 | lttng_ht_lookup(streams_ht, | |
1093 | (void *)((unsigned long) be64toh(stream_info.stream_id)), | |
1094 | &iter); | |
1095 | node = lttng_ht_iter_get_node_ulong(&iter); | |
1096 | if (node == NULL) { | |
77c7c900 | 1097 | DBG("Relay stream %" PRIu64 " not found", be64toh(stream_info.stream_id)); |
173af62f DG |
1098 | ret = -1; |
1099 | goto end_unlock; | |
1100 | } | |
1101 | ||
1102 | stream = caa_container_of(node, struct relay_stream, stream_n); | |
1103 | if (!stream) { | |
1104 | ret = -1; | |
1105 | goto end_unlock; | |
1106 | } | |
1107 | ||
8e2583a4 | 1108 | stream->last_net_seq_num = be64toh(stream_info.last_net_seq_num); |
173af62f DG |
1109 | stream->close_flag = 1; |
1110 | ||
1111 | if (close_stream_check(stream)) { | |
1112 | int delret; | |
1113 | ||
f66c074c DG |
1114 | delret = close(stream->fd); |
1115 | if (delret < 0) { | |
1116 | PERROR("close stream"); | |
1117 | } | |
173af62f DG |
1118 | delret = lttng_ht_del(streams_ht, &iter); |
1119 | assert(!delret); | |
1120 | call_rcu(&stream->rcu_node, | |
1121 | deferred_free_stream); | |
1122 | DBG("Closed tracefile %d from close stream", stream->fd); | |
1123 | } | |
1124 | ||
1125 | end_unlock: | |
1126 | rcu_read_unlock(); | |
1127 | ||
1128 | if (ret < 0) { | |
f73fabfd | 1129 | reply.ret_code = htobe32(LTTNG_ERR_UNK); |
173af62f | 1130 | } else { |
f73fabfd | 1131 | reply.ret_code = htobe32(LTTNG_OK); |
173af62f DG |
1132 | } |
1133 | send_ret = cmd->sock->ops->sendmsg(cmd->sock, &reply, | |
1134 | sizeof(struct lttcomm_relayd_generic_reply), 0); | |
1135 | if (send_ret < 0) { | |
1136 | ERR("Relay sending stream id"); | |
1137 | } | |
1138 | ||
1139 | end_no_session: | |
1140 | return ret; | |
1141 | } | |
1142 | ||
b8aa1682 JD |
1143 | /* |
1144 | * relay_unknown_command: send -1 if received unknown command | |
1145 | */ | |
1146 | static | |
1147 | void relay_unknown_command(struct relay_command *cmd) | |
1148 | { | |
1149 | struct lttcomm_relayd_generic_reply reply; | |
1150 | int ret; | |
1151 | ||
f73fabfd | 1152 | reply.ret_code = htobe32(LTTNG_ERR_UNK); |
b8aa1682 JD |
1153 | ret = cmd->sock->ops->sendmsg(cmd->sock, &reply, |
1154 | sizeof(struct lttcomm_relayd_generic_reply), 0); | |
1155 | if (ret < 0) { | |
1156 | ERR("Relay sending unknown command"); | |
1157 | } | |
1158 | } | |
1159 | ||
1160 | /* | |
1161 | * relay_start: send an acknowledgment to the client to tell if we are | |
1162 | * ready to receive data. We are ready if a session is established. | |
1163 | */ | |
1164 | static | |
1165 | int relay_start(struct lttcomm_relayd_hdr *recv_hdr, | |
1166 | struct relay_command *cmd) | |
1167 | { | |
f73fabfd | 1168 | int ret = htobe32(LTTNG_OK); |
b8aa1682 JD |
1169 | struct lttcomm_relayd_generic_reply reply; |
1170 | struct relay_session *session = cmd->session; | |
1171 | ||
1172 | if (!session) { | |
1173 | DBG("Trying to start the streaming without a session established"); | |
f73fabfd | 1174 | ret = htobe32(LTTNG_ERR_UNK); |
b8aa1682 JD |
1175 | } |
1176 | ||
1177 | reply.ret_code = ret; | |
1178 | ret = cmd->sock->ops->sendmsg(cmd->sock, &reply, | |
1179 | sizeof(struct lttcomm_relayd_generic_reply), 0); | |
1180 | if (ret < 0) { | |
1181 | ERR("Relay sending start ack"); | |
1182 | } | |
1183 | ||
1184 | return ret; | |
1185 | } | |
1186 | ||
1187 | /* | |
1188 | * Get stream from stream id. | |
9d1bbf21 | 1189 | * Need to be called with RCU read-side lock held. |
b8aa1682 JD |
1190 | */ |
1191 | static | |
1192 | struct relay_stream *relay_stream_from_stream_id(uint64_t stream_id, | |
1193 | struct lttng_ht *streams_ht) | |
1194 | { | |
1195 | struct lttng_ht_node_ulong *node; | |
1196 | struct lttng_ht_iter iter; | |
1197 | struct relay_stream *ret; | |
1198 | ||
1199 | lttng_ht_lookup(streams_ht, | |
1200 | (void *)((unsigned long) stream_id), | |
1201 | &iter); | |
1202 | node = lttng_ht_iter_get_node_ulong(&iter); | |
1203 | if (node == NULL) { | |
77c7c900 | 1204 | DBG("Relay stream %" PRIu64 " not found", stream_id); |
b8aa1682 JD |
1205 | ret = NULL; |
1206 | goto end; | |
1207 | } | |
1208 | ||
1209 | ret = caa_container_of(node, struct relay_stream, stream_n); | |
1210 | ||
1211 | end: | |
1212 | return ret; | |
1213 | } | |
1214 | ||
1d4dfdef DG |
1215 | /* |
1216 | * Append padding to the file pointed by the file descriptor fd. | |
1217 | */ | |
1218 | static int write_padding_to_file(int fd, uint32_t size) | |
1219 | { | |
1220 | int ret = 0; | |
1221 | char *zeros; | |
1222 | ||
1223 | if (size == 0) { | |
1224 | goto end; | |
1225 | } | |
1226 | ||
1227 | zeros = zmalloc(size); | |
1228 | if (zeros == NULL) { | |
1229 | PERROR("zmalloc zeros for padding"); | |
1230 | ret = -1; | |
1231 | goto end; | |
1232 | } | |
1233 | ||
1234 | do { | |
1235 | ret = write(fd, zeros, size); | |
1236 | } while (ret < 0 && errno == EINTR); | |
1237 | if (ret < 0) { | |
1238 | PERROR("write padding to file"); | |
1239 | } | |
1240 | ||
e986c7a1 DG |
1241 | free(zeros); |
1242 | ||
1d4dfdef DG |
1243 | end: |
1244 | return ret; | |
1245 | } | |
1246 | ||
b8aa1682 JD |
1247 | /* |
1248 | * relay_recv_metadata: receive the metada for the session. | |
1249 | */ | |
1250 | static | |
1251 | int relay_recv_metadata(struct lttcomm_relayd_hdr *recv_hdr, | |
1252 | struct relay_command *cmd, struct lttng_ht *streams_ht) | |
1253 | { | |
f73fabfd | 1254 | int ret = htobe32(LTTNG_OK); |
b8aa1682 JD |
1255 | struct relay_session *session = cmd->session; |
1256 | struct lttcomm_relayd_metadata_payload *metadata_struct; | |
1257 | struct relay_stream *metadata_stream; | |
1258 | uint64_t data_size, payload_size; | |
1259 | ||
1260 | if (!session) { | |
1261 | ERR("Metadata sent before version check"); | |
1262 | ret = -1; | |
1263 | goto end; | |
1264 | } | |
1265 | ||
f6416125 MD |
1266 | data_size = payload_size = be64toh(recv_hdr->data_size); |
1267 | if (data_size < sizeof(struct lttcomm_relayd_metadata_payload)) { | |
1268 | ERR("Incorrect data size"); | |
1269 | ret = -1; | |
1270 | goto end; | |
1271 | } | |
1272 | payload_size -= sizeof(struct lttcomm_relayd_metadata_payload); | |
1273 | ||
b8aa1682 | 1274 | if (data_buffer_size < data_size) { |
d7b3776f | 1275 | /* In case the realloc fails, we can free the memory */ |
c617c0c6 MD |
1276 | char *tmp_data_ptr; |
1277 | ||
1278 | tmp_data_ptr = realloc(data_buffer, data_size); | |
1279 | if (!tmp_data_ptr) { | |
b8aa1682 | 1280 | ERR("Allocating data buffer"); |
c617c0c6 | 1281 | free(data_buffer); |
b8aa1682 JD |
1282 | ret = -1; |
1283 | goto end; | |
1284 | } | |
c617c0c6 | 1285 | data_buffer = tmp_data_ptr; |
b8aa1682 JD |
1286 | data_buffer_size = data_size; |
1287 | } | |
1288 | memset(data_buffer, 0, data_size); | |
77c7c900 | 1289 | DBG2("Relay receiving metadata, waiting for %" PRIu64 " bytes", data_size); |
7c5aef62 | 1290 | ret = cmd->sock->ops->recvmsg(cmd->sock, data_buffer, data_size, 0); |
b8aa1682 JD |
1291 | if (ret < 0 || ret != data_size) { |
1292 | ret = -1; | |
1293 | ERR("Relay didn't receive the whole metadata"); | |
1294 | goto end; | |
1295 | } | |
1296 | metadata_struct = (struct lttcomm_relayd_metadata_payload *) data_buffer; | |
9d1bbf21 MD |
1297 | |
1298 | rcu_read_lock(); | |
b8aa1682 JD |
1299 | metadata_stream = relay_stream_from_stream_id( |
1300 | be64toh(metadata_struct->stream_id), streams_ht); | |
1301 | if (!metadata_stream) { | |
1302 | ret = -1; | |
9d1bbf21 | 1303 | goto end_unlock; |
b8aa1682 JD |
1304 | } |
1305 | ||
6f94560a MD |
1306 | do { |
1307 | ret = write(metadata_stream->fd, metadata_struct->payload, | |
1308 | payload_size); | |
1309 | } while (ret < 0 && errno == EINTR); | |
87c1611d | 1310 | if (ret < payload_size) { |
b8aa1682 JD |
1311 | ERR("Relay error writing metadata on file"); |
1312 | ret = -1; | |
9d1bbf21 | 1313 | goto end_unlock; |
b8aa1682 | 1314 | } |
1d4dfdef DG |
1315 | |
1316 | ret = write_padding_to_file(metadata_stream->fd, | |
1317 | be32toh(metadata_struct->padding_size)); | |
1318 | if (ret < 0) { | |
1319 | goto end_unlock; | |
1320 | } | |
1321 | ||
b8aa1682 JD |
1322 | DBG2("Relay metadata written"); |
1323 | ||
9d1bbf21 | 1324 | end_unlock: |
6e3c5836 | 1325 | rcu_read_unlock(); |
b8aa1682 JD |
1326 | end: |
1327 | return ret; | |
1328 | } | |
1329 | ||
1330 | /* | |
1331 | * relay_send_version: send relayd version number | |
1332 | */ | |
1333 | static | |
1334 | int relay_send_version(struct lttcomm_relayd_hdr *recv_hdr, | |
1335 | struct relay_command *cmd) | |
1336 | { | |
7f51dcba | 1337 | int ret; |
092b6259 | 1338 | struct lttcomm_relayd_version reply, msg; |
b8aa1682 | 1339 | |
c5b6f4f0 DG |
1340 | assert(cmd); |
1341 | ||
1342 | cmd->version_check_done = 1; | |
b8aa1682 | 1343 | |
092b6259 | 1344 | /* Get version from the other side. */ |
7c5aef62 | 1345 | ret = cmd->sock->ops->recvmsg(cmd->sock, &msg, sizeof(msg), 0); |
092b6259 DG |
1346 | if (ret < 0 || ret != sizeof(msg)) { |
1347 | ret = -1; | |
1348 | ERR("Relay failed to receive the version values."); | |
1349 | goto end; | |
1350 | } | |
1351 | ||
1352 | /* | |
1353 | * For now, we just ignore the received version but after 2.1 stable | |
1354 | * release, a check must be done to see if we either adapt to the other | |
1355 | * side version (which MUST be lower than us) or keep the latest data | |
1356 | * structure considering that the other side will adapt. | |
1357 | */ | |
1358 | ||
c617c0c6 | 1359 | ret = sscanf(VERSION, "%10u.%10u", &reply.major, &reply.minor); |
7f51dcba MD |
1360 | if (ret < 2) { |
1361 | ERR("Error in scanning version"); | |
1362 | ret = -1; | |
1363 | goto end; | |
1364 | } | |
b8aa1682 JD |
1365 | reply.major = htobe32(reply.major); |
1366 | reply.minor = htobe32(reply.minor); | |
1367 | ret = cmd->sock->ops->sendmsg(cmd->sock, &reply, | |
1368 | sizeof(struct lttcomm_relayd_version), 0); | |
1369 | if (ret < 0) { | |
1370 | ERR("Relay sending version"); | |
1371 | } | |
0a6b5085 DG |
1372 | DBG("Version check done (%u.%u)", be32toh(reply.major), |
1373 | be32toh(reply.minor)); | |
b8aa1682 JD |
1374 | |
1375 | end: | |
1376 | return ret; | |
1377 | } | |
1378 | ||
c8f59ee5 | 1379 | /* |
6d805429 | 1380 | * Check for data pending for a given stream id from the session daemon. |
c8f59ee5 DG |
1381 | */ |
1382 | static | |
6d805429 | 1383 | int relay_data_pending(struct lttcomm_relayd_hdr *recv_hdr, |
c8f59ee5 DG |
1384 | struct relay_command *cmd, struct lttng_ht *streams_ht) |
1385 | { | |
1386 | struct relay_session *session = cmd->session; | |
6d805429 | 1387 | struct lttcomm_relayd_data_pending msg; |
c8f59ee5 DG |
1388 | struct lttcomm_relayd_generic_reply reply; |
1389 | struct relay_stream *stream; | |
1390 | int ret; | |
1391 | struct lttng_ht_node_ulong *node; | |
1392 | struct lttng_ht_iter iter; | |
1393 | uint64_t last_net_seq_num, stream_id; | |
1394 | ||
6d805429 | 1395 | DBG("Data pending command received"); |
c8f59ee5 | 1396 | |
c5b6f4f0 | 1397 | if (!session || cmd->version_check_done == 0) { |
c8f59ee5 DG |
1398 | ERR("Trying to check for data before version check"); |
1399 | ret = -1; | |
1400 | goto end_no_session; | |
1401 | } | |
1402 | ||
7c5aef62 | 1403 | ret = cmd->sock->ops->recvmsg(cmd->sock, &msg, sizeof(msg), 0); |
c8f59ee5 | 1404 | if (ret < sizeof(msg)) { |
6d805429 | 1405 | ERR("Relay didn't receive valid data_pending struct size : %d", ret); |
c8f59ee5 DG |
1406 | ret = -1; |
1407 | goto end_no_session; | |
1408 | } | |
1409 | ||
1410 | stream_id = be64toh(msg.stream_id); | |
1411 | last_net_seq_num = be64toh(msg.last_net_seq_num); | |
1412 | ||
1413 | rcu_read_lock(); | |
1414 | lttng_ht_lookup(streams_ht, (void *)((unsigned long) stream_id), &iter); | |
1415 | node = lttng_ht_iter_get_node_ulong(&iter); | |
1416 | if (node == NULL) { | |
1417 | DBG("Relay stream %" PRIu64 " not found", stream_id); | |
1418 | ret = -1; | |
1419 | goto end_unlock; | |
1420 | } | |
1421 | ||
1422 | stream = caa_container_of(node, struct relay_stream, stream_n); | |
1423 | assert(stream); | |
1424 | ||
6d805429 | 1425 | DBG("Data pending for stream id %" PRIu64 " prev_seq %" PRIu64 |
c8f59ee5 DG |
1426 | " and last_seq %" PRIu64, stream_id, stream->prev_seq, |
1427 | last_net_seq_num); | |
1428 | ||
33832e64 DG |
1429 | /* Avoid wrapping issue */ |
1430 | if (((int64_t) (stream->prev_seq - last_net_seq_num)) <= 0) { | |
6d805429 | 1431 | /* Data has in fact been written and is NOT pending */ |
c8f59ee5 | 1432 | ret = 0; |
6d805429 DG |
1433 | } else { |
1434 | /* Data still being streamed thus pending */ | |
1435 | ret = 1; | |
c8f59ee5 DG |
1436 | } |
1437 | ||
f7079f67 DG |
1438 | /* Pending check is now done. */ |
1439 | stream->data_pending_check_done = 1; | |
1440 | ||
c8f59ee5 DG |
1441 | end_unlock: |
1442 | rcu_read_unlock(); | |
1443 | ||
1444 | reply.ret_code = htobe32(ret); | |
1445 | ret = cmd->sock->ops->sendmsg(cmd->sock, &reply, sizeof(reply), 0); | |
1446 | if (ret < 0) { | |
6d805429 | 1447 | ERR("Relay data pending ret code failed"); |
c8f59ee5 DG |
1448 | } |
1449 | ||
1450 | end_no_session: | |
1451 | return ret; | |
1452 | } | |
1453 | ||
1454 | /* | |
1455 | * Wait for the control socket to reach a quiescent state. | |
1456 | * | |
1457 | * Note that for now, when receiving this command from the session daemon, this | |
1458 | * means that every subsequent commands or data received on the control socket | |
1459 | * has been handled. So, this is why we simply return OK here. | |
1460 | */ | |
1461 | static | |
1462 | int relay_quiescent_control(struct lttcomm_relayd_hdr *recv_hdr, | |
ad7051c0 | 1463 | struct relay_command *cmd, struct lttng_ht *streams_ht) |
c8f59ee5 DG |
1464 | { |
1465 | int ret; | |
ad7051c0 DG |
1466 | uint64_t stream_id; |
1467 | struct relay_stream *stream; | |
1468 | struct lttng_ht_iter iter; | |
1469 | struct lttcomm_relayd_quiescent_control msg; | |
c8f59ee5 DG |
1470 | struct lttcomm_relayd_generic_reply reply; |
1471 | ||
1472 | DBG("Checking quiescent state on control socket"); | |
1473 | ||
ad7051c0 DG |
1474 | if (!cmd->session || cmd->version_check_done == 0) { |
1475 | ERR("Trying to check for data before version check"); | |
1476 | ret = -1; | |
1477 | goto end_no_session; | |
1478 | } | |
1479 | ||
1480 | ret = cmd->sock->ops->recvmsg(cmd->sock, &msg, sizeof(msg), 0); | |
1481 | if (ret < sizeof(msg)) { | |
1482 | ERR("Relay didn't receive valid begin data_pending struct size: %d", | |
1483 | ret); | |
1484 | ret = -1; | |
1485 | goto end_no_session; | |
1486 | } | |
1487 | ||
1488 | stream_id = be64toh(msg.stream_id); | |
1489 | ||
1490 | rcu_read_lock(); | |
1491 | cds_lfht_for_each_entry(streams_ht->ht, &iter.iter, stream, stream_n.node) { | |
1492 | if (stream->stream_handle == stream_id) { | |
1493 | stream->data_pending_check_done = 1; | |
1494 | DBG("Relay quiescent control pending flag set to %" PRIu64, | |
1495 | stream_id); | |
1496 | break; | |
1497 | } | |
1498 | } | |
1499 | rcu_read_unlock(); | |
1500 | ||
c8f59ee5 DG |
1501 | reply.ret_code = htobe32(LTTNG_OK); |
1502 | ret = cmd->sock->ops->sendmsg(cmd->sock, &reply, sizeof(reply), 0); | |
1503 | if (ret < 0) { | |
6d805429 | 1504 | ERR("Relay data quiescent control ret code failed"); |
c8f59ee5 DG |
1505 | } |
1506 | ||
ad7051c0 | 1507 | end_no_session: |
c8f59ee5 DG |
1508 | return ret; |
1509 | } | |
1510 | ||
f7079f67 DG |
1511 | /* |
1512 | * Initialize a data pending command. This means that a client is about to ask | |
1513 | * for data pending for each stream he/she holds. Simply iterate over all | |
1514 | * streams of a session and set the data_pending_check_done flag. | |
1515 | * | |
1516 | * This command returns to the client a LTTNG_OK code. | |
1517 | */ | |
1518 | static | |
1519 | int relay_begin_data_pending(struct lttcomm_relayd_hdr *recv_hdr, | |
1520 | struct relay_command *cmd, struct lttng_ht *streams_ht) | |
1521 | { | |
1522 | int ret; | |
1523 | struct lttng_ht_iter iter; | |
1524 | struct lttcomm_relayd_begin_data_pending msg; | |
1525 | struct lttcomm_relayd_generic_reply reply; | |
1526 | struct relay_stream *stream; | |
1527 | uint64_t session_id; | |
1528 | ||
1529 | assert(recv_hdr); | |
1530 | assert(cmd); | |
1531 | assert(streams_ht); | |
1532 | ||
1533 | DBG("Init streams for data pending"); | |
1534 | ||
1535 | if (!cmd->session || cmd->version_check_done == 0) { | |
1536 | ERR("Trying to check for data before version check"); | |
1537 | ret = -1; | |
1538 | goto end_no_session; | |
1539 | } | |
1540 | ||
1541 | ret = cmd->sock->ops->recvmsg(cmd->sock, &msg, sizeof(msg), 0); | |
1542 | if (ret < sizeof(msg)) { | |
1543 | ERR("Relay didn't receive valid begin data_pending struct size: %d", | |
1544 | ret); | |
1545 | ret = -1; | |
1546 | goto end_no_session; | |
1547 | } | |
1548 | ||
1549 | session_id = be64toh(msg.session_id); | |
1550 | ||
1551 | /* | |
1552 | * Iterate over all streams to set the begin data pending flag. For now, the | |
1553 | * streams are indexed by stream handle so we have to iterate over all | |
1554 | * streams to find the one associated with the right session_id. | |
1555 | */ | |
1556 | rcu_read_lock(); | |
1557 | cds_lfht_for_each_entry(streams_ht->ht, &iter.iter, stream, stream_n.node) { | |
1558 | if (stream->session->id == session_id) { | |
1559 | stream->data_pending_check_done = 0; | |
1560 | DBG("Set begin data pending flag to stream %" PRIu64, | |
1561 | stream->stream_handle); | |
1562 | } | |
1563 | } | |
1564 | rcu_read_unlock(); | |
1565 | ||
1566 | /* All good, send back reply. */ | |
1567 | reply.ret_code = htobe32(LTTNG_OK); | |
1568 | ||
1569 | ret = cmd->sock->ops->sendmsg(cmd->sock, &reply, sizeof(reply), 0); | |
1570 | if (ret < 0) { | |
1571 | ERR("Relay begin data pending send reply failed"); | |
1572 | } | |
1573 | ||
1574 | end_no_session: | |
1575 | return ret; | |
1576 | } | |
1577 | ||
1578 | /* | |
1579 | * End data pending command. This will check, for a given session id, if each | |
1580 | * stream associated with it has its data_pending_check_done flag set. If not, | |
1581 | * this means that the client lost track of the stream but the data is still | |
1582 | * being streamed on our side. In this case, we inform the client that data is | |
1583 | * inflight. | |
1584 | * | |
1585 | * Return to the client if there is data in flight or not with a ret_code. | |
1586 | */ | |
1587 | static | |
1588 | int relay_end_data_pending(struct lttcomm_relayd_hdr *recv_hdr, | |
1589 | struct relay_command *cmd, struct lttng_ht *streams_ht) | |
1590 | { | |
1591 | int ret; | |
1592 | struct lttng_ht_iter iter; | |
1593 | struct lttcomm_relayd_end_data_pending msg; | |
1594 | struct lttcomm_relayd_generic_reply reply; | |
1595 | struct relay_stream *stream; | |
1596 | uint64_t session_id; | |
1597 | uint32_t is_data_inflight = 0; | |
1598 | ||
1599 | assert(recv_hdr); | |
1600 | assert(cmd); | |
1601 | assert(streams_ht); | |
1602 | ||
1603 | DBG("End data pending command"); | |
1604 | ||
1605 | if (!cmd->session || cmd->version_check_done == 0) { | |
1606 | ERR("Trying to check for data before version check"); | |
1607 | ret = -1; | |
1608 | goto end_no_session; | |
1609 | } | |
1610 | ||
1611 | ret = cmd->sock->ops->recvmsg(cmd->sock, &msg, sizeof(msg), 0); | |
1612 | if (ret < sizeof(msg)) { | |
1613 | ERR("Relay didn't receive valid end data_pending struct size: %d", | |
1614 | ret); | |
1615 | ret = -1; | |
1616 | goto end_no_session; | |
1617 | } | |
1618 | ||
1619 | session_id = be64toh(msg.session_id); | |
1620 | ||
1621 | /* Iterate over all streams to see if the begin data pending flag is set. */ | |
1622 | rcu_read_lock(); | |
1623 | cds_lfht_for_each_entry(streams_ht->ht, &iter.iter, stream, stream_n.node) { | |
1624 | if (stream->session->id == session_id && | |
1625 | !stream->data_pending_check_done) { | |
1626 | is_data_inflight = 1; | |
1627 | DBG("Data is still in flight for stream %" PRIu64, | |
1628 | stream->stream_handle); | |
1629 | break; | |
1630 | } | |
1631 | } | |
1632 | rcu_read_unlock(); | |
1633 | ||
1634 | /* All good, send back reply. */ | |
1635 | reply.ret_code = htobe32(is_data_inflight); | |
1636 | ||
1637 | ret = cmd->sock->ops->sendmsg(cmd->sock, &reply, sizeof(reply), 0); | |
1638 | if (ret < 0) { | |
1639 | ERR("Relay end data pending send reply failed"); | |
1640 | } | |
1641 | ||
1642 | end_no_session: | |
1643 | return ret; | |
1644 | } | |
1645 | ||
b8aa1682 JD |
1646 | /* |
1647 | * relay_process_control: Process the commands received on the control socket | |
1648 | */ | |
1649 | static | |
1650 | int relay_process_control(struct lttcomm_relayd_hdr *recv_hdr, | |
1651 | struct relay_command *cmd, struct lttng_ht *streams_ht) | |
1652 | { | |
1653 | int ret = 0; | |
1654 | ||
1655 | switch (be32toh(recv_hdr->cmd)) { | |
b8aa1682 JD |
1656 | case RELAYD_CREATE_SESSION: |
1657 | ret = relay_create_session(recv_hdr, cmd); | |
1658 | break; | |
b8aa1682 JD |
1659 | case RELAYD_ADD_STREAM: |
1660 | ret = relay_add_stream(recv_hdr, cmd, streams_ht); | |
1661 | break; | |
1662 | case RELAYD_START_DATA: | |
1663 | ret = relay_start(recv_hdr, cmd); | |
1664 | break; | |
1665 | case RELAYD_SEND_METADATA: | |
1666 | ret = relay_recv_metadata(recv_hdr, cmd, streams_ht); | |
1667 | break; | |
1668 | case RELAYD_VERSION: | |
1669 | ret = relay_send_version(recv_hdr, cmd); | |
1670 | break; | |
173af62f DG |
1671 | case RELAYD_CLOSE_STREAM: |
1672 | ret = relay_close_stream(recv_hdr, cmd, streams_ht); | |
1673 | break; | |
6d805429 DG |
1674 | case RELAYD_DATA_PENDING: |
1675 | ret = relay_data_pending(recv_hdr, cmd, streams_ht); | |
c8f59ee5 DG |
1676 | break; |
1677 | case RELAYD_QUIESCENT_CONTROL: | |
ad7051c0 | 1678 | ret = relay_quiescent_control(recv_hdr, cmd, streams_ht); |
c8f59ee5 | 1679 | break; |
f7079f67 DG |
1680 | case RELAYD_BEGIN_DATA_PENDING: |
1681 | ret = relay_begin_data_pending(recv_hdr, cmd, streams_ht); | |
1682 | break; | |
1683 | case RELAYD_END_DATA_PENDING: | |
1684 | ret = relay_end_data_pending(recv_hdr, cmd, streams_ht); | |
1685 | break; | |
b8aa1682 JD |
1686 | case RELAYD_UPDATE_SYNC_INFO: |
1687 | default: | |
1688 | ERR("Received unknown command (%u)", be32toh(recv_hdr->cmd)); | |
1689 | relay_unknown_command(cmd); | |
1690 | ret = -1; | |
1691 | goto end; | |
1692 | } | |
1693 | ||
1694 | end: | |
1695 | return ret; | |
1696 | } | |
1697 | ||
1698 | /* | |
1699 | * relay_process_data: Process the data received on the data socket | |
1700 | */ | |
1701 | static | |
1702 | int relay_process_data(struct relay_command *cmd, struct lttng_ht *streams_ht) | |
1703 | { | |
1704 | int ret = 0; | |
1705 | struct relay_stream *stream; | |
1706 | struct lttcomm_relayd_data_hdr data_hdr; | |
1707 | uint64_t stream_id; | |
173af62f | 1708 | uint64_t net_seq_num; |
b8aa1682 JD |
1709 | uint32_t data_size; |
1710 | ||
1711 | ret = cmd->sock->ops->recvmsg(cmd->sock, &data_hdr, | |
7c5aef62 | 1712 | sizeof(struct lttcomm_relayd_data_hdr), 0); |
b8aa1682 JD |
1713 | if (ret <= 0) { |
1714 | ERR("Connections seems to be closed"); | |
1715 | ret = -1; | |
1716 | goto end; | |
1717 | } | |
1718 | ||
1719 | stream_id = be64toh(data_hdr.stream_id); | |
9d1bbf21 MD |
1720 | |
1721 | rcu_read_lock(); | |
b8aa1682 JD |
1722 | stream = relay_stream_from_stream_id(stream_id, streams_ht); |
1723 | if (!stream) { | |
1724 | ret = -1; | |
9d1bbf21 | 1725 | goto end_unlock; |
b8aa1682 JD |
1726 | } |
1727 | ||
1728 | data_size = be32toh(data_hdr.data_size); | |
1729 | if (data_buffer_size < data_size) { | |
c617c0c6 MD |
1730 | char *tmp_data_ptr; |
1731 | ||
1732 | tmp_data_ptr = realloc(data_buffer, data_size); | |
1733 | if (!tmp_data_ptr) { | |
b8aa1682 | 1734 | ERR("Allocating data buffer"); |
c617c0c6 | 1735 | free(data_buffer); |
b8aa1682 | 1736 | ret = -1; |
9d1bbf21 | 1737 | goto end_unlock; |
b8aa1682 | 1738 | } |
c617c0c6 | 1739 | data_buffer = tmp_data_ptr; |
b8aa1682 JD |
1740 | data_buffer_size = data_size; |
1741 | } | |
1742 | memset(data_buffer, 0, data_size); | |
1743 | ||
173af62f DG |
1744 | net_seq_num = be64toh(data_hdr.net_seq_num); |
1745 | ||
77c7c900 | 1746 | DBG3("Receiving data of size %u for stream id %" PRIu64 " seqnum %" PRIu64, |
173af62f | 1747 | data_size, stream_id, net_seq_num); |
7c5aef62 | 1748 | ret = cmd->sock->ops->recvmsg(cmd->sock, data_buffer, data_size, 0); |
b8aa1682 JD |
1749 | if (ret <= 0) { |
1750 | ret = -1; | |
9d1bbf21 | 1751 | goto end_unlock; |
b8aa1682 JD |
1752 | } |
1753 | ||
6f94560a MD |
1754 | do { |
1755 | ret = write(stream->fd, data_buffer, data_size); | |
1756 | } while (ret < 0 && errno == EINTR); | |
b8aa1682 JD |
1757 | if (ret < data_size) { |
1758 | ERR("Relay error writing data to file"); | |
1759 | ret = -1; | |
9d1bbf21 | 1760 | goto end_unlock; |
b8aa1682 | 1761 | } |
1d4dfdef | 1762 | |
5ab7344e JD |
1763 | DBG2("Relay wrote %d bytes to tracefile for stream id %" PRIu64, |
1764 | ret, stream->stream_handle); | |
1765 | ||
1d4dfdef DG |
1766 | ret = write_padding_to_file(stream->fd, be32toh(data_hdr.padding_size)); |
1767 | if (ret < 0) { | |
1768 | goto end_unlock; | |
1769 | } | |
1770 | ||
173af62f DG |
1771 | stream->prev_seq = net_seq_num; |
1772 | ||
1773 | /* Check if we need to close the FD */ | |
1774 | if (close_stream_check(stream)) { | |
f66c074c | 1775 | int cret; |
173af62f DG |
1776 | struct lttng_ht_iter iter; |
1777 | ||
f66c074c DG |
1778 | cret = close(stream->fd); |
1779 | if (cret < 0) { | |
1780 | PERROR("close stream process data"); | |
1781 | } | |
173af62f DG |
1782 | iter.iter.node = &stream->stream_n.node; |
1783 | ret = lttng_ht_del(streams_ht, &iter); | |
1784 | assert(!ret); | |
1785 | call_rcu(&stream->rcu_node, | |
1786 | deferred_free_stream); | |
1787 | DBG("Closed tracefile %d after recv data", stream->fd); | |
1788 | } | |
1789 | ||
9d1bbf21 MD |
1790 | end_unlock: |
1791 | rcu_read_unlock(); | |
b8aa1682 JD |
1792 | end: |
1793 | return ret; | |
1794 | } | |
1795 | ||
1796 | static | |
9d1bbf21 | 1797 | void relay_cleanup_poll_connection(struct lttng_poll_event *events, int pollfd) |
b8aa1682 JD |
1798 | { |
1799 | int ret; | |
1800 | ||
b8aa1682 JD |
1801 | lttng_poll_del(events, pollfd); |
1802 | ||
1803 | ret = close(pollfd); | |
1804 | if (ret < 0) { | |
1805 | ERR("Closing pollfd %d", pollfd); | |
1806 | } | |
1807 | } | |
1808 | ||
1809 | static | |
1810 | int relay_add_connection(int fd, struct lttng_poll_event *events, | |
1811 | struct lttng_ht *relay_connections_ht) | |
1812 | { | |
b8aa1682 | 1813 | struct relay_command *relay_connection; |
9d1bbf21 | 1814 | int ret; |
b8aa1682 JD |
1815 | |
1816 | relay_connection = zmalloc(sizeof(struct relay_command)); | |
1817 | if (relay_connection == NULL) { | |
1818 | PERROR("Relay command zmalloc"); | |
9d1bbf21 | 1819 | goto error; |
b8aa1682 | 1820 | } |
f921c78f DG |
1821 | do { |
1822 | ret = read(fd, relay_connection, sizeof(struct relay_command)); | |
1823 | } while (ret < 0 && errno == EINTR); | |
cdf0f8fc | 1824 | if (ret < 0 || ret < sizeof(struct relay_command)) { |
b8aa1682 | 1825 | PERROR("read relay cmd pipe"); |
9d1bbf21 | 1826 | goto error_read; |
b8aa1682 JD |
1827 | } |
1828 | ||
1829 | lttng_ht_node_init_ulong(&relay_connection->sock_n, | |
1830 | (unsigned long) relay_connection->sock->fd); | |
9d1bbf21 | 1831 | rcu_read_lock(); |
b8aa1682 JD |
1832 | lttng_ht_add_unique_ulong(relay_connections_ht, |
1833 | &relay_connection->sock_n); | |
9d1bbf21 MD |
1834 | rcu_read_unlock(); |
1835 | return lttng_poll_add(events, | |
b8aa1682 JD |
1836 | relay_connection->sock->fd, |
1837 | LPOLLIN | LPOLLRDHUP); | |
1838 | ||
9d1bbf21 MD |
1839 | error_read: |
1840 | free(relay_connection); | |
1841 | error: | |
1842 | return -1; | |
1843 | } | |
1844 | ||
1845 | static | |
1846 | void deferred_free_connection(struct rcu_head *head) | |
1847 | { | |
1848 | struct relay_command *relay_connection = | |
1849 | caa_container_of(head, struct relay_command, rcu_node); | |
5b6d8097 DG |
1850 | |
1851 | lttcomm_destroy_sock(relay_connection->sock); | |
9d1bbf21 MD |
1852 | free(relay_connection); |
1853 | } | |
1854 | ||
1855 | static | |
1856 | void relay_del_connection(struct lttng_ht *relay_connections_ht, | |
1857 | struct lttng_ht *streams_ht, struct lttng_ht_iter *iter, | |
1858 | struct relay_command *relay_connection) | |
1859 | { | |
1860 | int ret; | |
1861 | ||
1862 | ret = lttng_ht_del(relay_connections_ht, iter); | |
1863 | assert(!ret); | |
1864 | if (relay_connection->type == RELAY_CONTROL) { | |
1865 | relay_delete_session(relay_connection, streams_ht); | |
1866 | } | |
5b6d8097 | 1867 | |
9d1bbf21 MD |
1868 | call_rcu(&relay_connection->rcu_node, |
1869 | deferred_free_connection); | |
b8aa1682 JD |
1870 | } |
1871 | ||
1872 | /* | |
1873 | * This thread does the actual work | |
1874 | */ | |
1875 | static | |
1876 | void *relay_thread_worker(void *data) | |
1877 | { | |
beaad64c DG |
1878 | int ret, err = -1, last_seen_data_fd = -1; |
1879 | uint32_t nb_fd; | |
b8aa1682 JD |
1880 | struct relay_command *relay_connection; |
1881 | struct lttng_poll_event events; | |
1882 | struct lttng_ht *relay_connections_ht; | |
1883 | struct lttng_ht_node_ulong *node; | |
1884 | struct lttng_ht_iter iter; | |
1885 | struct lttng_ht *streams_ht; | |
1886 | struct lttcomm_relayd_hdr recv_hdr; | |
1887 | ||
1888 | DBG("[thread] Relay worker started"); | |
1889 | ||
9d1bbf21 MD |
1890 | rcu_register_thread(); |
1891 | ||
b8aa1682 JD |
1892 | /* table of connections indexed on socket */ |
1893 | relay_connections_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); | |
095a4ae5 MD |
1894 | if (!relay_connections_ht) { |
1895 | goto relay_connections_ht_error; | |
1896 | } | |
b8aa1682 JD |
1897 | |
1898 | /* tables of streams indexed by stream ID */ | |
1899 | streams_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); | |
095a4ae5 MD |
1900 | if (!streams_ht) { |
1901 | goto streams_ht_error; | |
1902 | } | |
b8aa1682 JD |
1903 | |
1904 | ret = create_thread_poll_set(&events, 2); | |
1905 | if (ret < 0) { | |
1906 | goto error_poll_create; | |
1907 | } | |
1908 | ||
1909 | ret = lttng_poll_add(&events, relay_cmd_pipe[0], LPOLLIN | LPOLLRDHUP); | |
1910 | if (ret < 0) { | |
1911 | goto error; | |
1912 | } | |
1913 | ||
beaad64c | 1914 | restart: |
b8aa1682 | 1915 | while (1) { |
beaad64c DG |
1916 | int idx = -1, i, seen_control = 0, last_notdel_data_fd = -1; |
1917 | ||
b8aa1682 | 1918 | /* Infinite blocking call, waiting for transmission */ |
87c1611d | 1919 | DBG3("Relayd worker thread polling..."); |
b8aa1682 JD |
1920 | ret = lttng_poll_wait(&events, -1); |
1921 | if (ret < 0) { | |
1922 | /* | |
1923 | * Restart interrupted system call. | |
1924 | */ | |
1925 | if (errno == EINTR) { | |
1926 | goto restart; | |
1927 | } | |
1928 | goto error; | |
1929 | } | |
1930 | ||
0d9c5d77 DG |
1931 | nb_fd = ret; |
1932 | ||
beaad64c DG |
1933 | /* |
1934 | * Process control. The control connection is prioritised so we don't | |
1935 | * starve it with high throughout put tracing data on the data | |
1936 | * connection. | |
1937 | */ | |
b8aa1682 JD |
1938 | for (i = 0; i < nb_fd; i++) { |
1939 | /* Fetch once the poll data */ | |
beaad64c DG |
1940 | uint32_t revents = LTTNG_POLL_GETEV(&events, i); |
1941 | int pollfd = LTTNG_POLL_GETFD(&events, i); | |
b8aa1682 JD |
1942 | |
1943 | /* Thread quit pipe has been closed. Killing thread. */ | |
1944 | ret = check_thread_quit_pipe(pollfd, revents); | |
1945 | if (ret) { | |
095a4ae5 MD |
1946 | err = 0; |
1947 | goto exit; | |
b8aa1682 JD |
1948 | } |
1949 | ||
1950 | /* Inspect the relay cmd pipe for new connection */ | |
1951 | if (pollfd == relay_cmd_pipe[0]) { | |
1952 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
1953 | ERR("Relay pipe error"); | |
1954 | goto error; | |
1955 | } else if (revents & LPOLLIN) { | |
1956 | DBG("Relay command received"); | |
1957 | ret = relay_add_connection(relay_cmd_pipe[0], | |
1958 | &events, relay_connections_ht); | |
1959 | if (ret < 0) { | |
1960 | goto error; | |
1961 | } | |
1962 | } | |
beaad64c | 1963 | } else if (revents) { |
9d1bbf21 | 1964 | rcu_read_lock(); |
b8aa1682 JD |
1965 | lttng_ht_lookup(relay_connections_ht, |
1966 | (void *)((unsigned long) pollfd), | |
1967 | &iter); | |
1968 | node = lttng_ht_iter_get_node_ulong(&iter); | |
1969 | if (node == NULL) { | |
1970 | DBG2("Relay sock %d not found", pollfd); | |
9d1bbf21 | 1971 | rcu_read_unlock(); |
b8aa1682 JD |
1972 | goto error; |
1973 | } | |
1974 | relay_connection = caa_container_of(node, | |
1975 | struct relay_command, sock_n); | |
1976 | ||
1977 | if (revents & (LPOLLERR)) { | |
1978 | ERR("POLL ERROR"); | |
9d1bbf21 MD |
1979 | relay_cleanup_poll_connection(&events, pollfd); |
1980 | relay_del_connection(relay_connections_ht, | |
1981 | streams_ht, &iter, | |
1982 | relay_connection); | |
beaad64c DG |
1983 | if (last_seen_data_fd == pollfd) { |
1984 | last_seen_data_fd = last_notdel_data_fd; | |
1985 | } | |
b8aa1682 JD |
1986 | } else if (revents & (LPOLLHUP | LPOLLRDHUP)) { |
1987 | DBG("Socket %d hung up", pollfd); | |
9d1bbf21 MD |
1988 | relay_cleanup_poll_connection(&events, pollfd); |
1989 | relay_del_connection(relay_connections_ht, | |
1990 | streams_ht, &iter, | |
1991 | relay_connection); | |
beaad64c DG |
1992 | if (last_seen_data_fd == pollfd) { |
1993 | last_seen_data_fd = last_notdel_data_fd; | |
1994 | } | |
b8aa1682 JD |
1995 | } else if (revents & LPOLLIN) { |
1996 | /* control socket */ | |
1997 | if (relay_connection->type == RELAY_CONTROL) { | |
1998 | ret = relay_connection->sock->ops->recvmsg( | |
1999 | relay_connection->sock, &recv_hdr, | |
7c5aef62 | 2000 | sizeof(struct lttcomm_relayd_hdr), 0); |
b8aa1682 JD |
2001 | /* connection closed */ |
2002 | if (ret <= 0) { | |
9d1bbf21 MD |
2003 | relay_cleanup_poll_connection(&events, pollfd); |
2004 | relay_del_connection(relay_connections_ht, | |
2005 | streams_ht, &iter, | |
2006 | relay_connection); | |
b8aa1682 JD |
2007 | DBG("Control connection closed with %d", pollfd); |
2008 | } else { | |
2009 | if (relay_connection->session) { | |
77c7c900 | 2010 | DBG2("Relay worker receiving data for session : %" PRIu64, |
b8aa1682 JD |
2011 | relay_connection->session->id); |
2012 | } | |
2013 | ret = relay_process_control(&recv_hdr, | |
2014 | relay_connection, | |
2015 | streams_ht); | |
b8aa1682 | 2016 | if (ret < 0) { |
beaad64c | 2017 | /* Clear the session on error. */ |
9d1bbf21 MD |
2018 | relay_cleanup_poll_connection(&events, pollfd); |
2019 | relay_del_connection(relay_connections_ht, | |
2020 | streams_ht, &iter, | |
2021 | relay_connection); | |
b8aa1682 JD |
2022 | DBG("Connection closed with %d", pollfd); |
2023 | } | |
beaad64c | 2024 | seen_control = 1; |
b8aa1682 | 2025 | } |
beaad64c DG |
2026 | } else { |
2027 | /* | |
2028 | * Flag the last seen data fd not deleted. It will be | |
2029 | * used as the last seen fd if any fd gets deleted in | |
2030 | * this first loop. | |
2031 | */ | |
2032 | last_notdel_data_fd = pollfd; | |
2033 | } | |
2034 | } | |
2035 | rcu_read_unlock(); | |
2036 | } | |
2037 | } | |
2038 | ||
2039 | /* | |
2040 | * The last loop handled a control request, go back to poll to make | |
2041 | * sure we prioritise the control socket. | |
2042 | */ | |
2043 | if (seen_control) { | |
2044 | continue; | |
2045 | } | |
2046 | ||
2047 | if (last_seen_data_fd >= 0) { | |
2048 | for (i = 0; i < nb_fd; i++) { | |
2049 | int pollfd = LTTNG_POLL_GETFD(&events, i); | |
2050 | if (last_seen_data_fd == pollfd) { | |
2051 | idx = i; | |
2052 | break; | |
2053 | } | |
2054 | } | |
2055 | } | |
2056 | ||
2057 | /* Process data connection. */ | |
2058 | for (i = idx + 1; i < nb_fd; i++) { | |
2059 | /* Fetch the poll data. */ | |
2060 | uint32_t revents = LTTNG_POLL_GETEV(&events, i); | |
2061 | int pollfd = LTTNG_POLL_GETFD(&events, i); | |
2062 | ||
2063 | /* Skip the command pipe. It's handled in the first loop. */ | |
2064 | if (pollfd == relay_cmd_pipe[0]) { | |
2065 | continue; | |
2066 | } | |
2067 | ||
2068 | if (revents) { | |
2069 | rcu_read_lock(); | |
2070 | lttng_ht_lookup(relay_connections_ht, | |
2071 | (void *)((unsigned long) pollfd), | |
2072 | &iter); | |
2073 | node = lttng_ht_iter_get_node_ulong(&iter); | |
2074 | if (node == NULL) { | |
2075 | /* Skip it. Might be removed before. */ | |
2076 | rcu_read_unlock(); | |
2077 | continue; | |
2078 | } | |
2079 | relay_connection = caa_container_of(node, | |
2080 | struct relay_command, sock_n); | |
2081 | ||
2082 | if (revents & LPOLLIN) { | |
2083 | if (relay_connection->type != RELAY_DATA) { | |
2084 | continue; | |
2085 | } | |
2086 | ||
2087 | ret = relay_process_data(relay_connection, streams_ht); | |
2088 | /* connection closed */ | |
2089 | if (ret < 0) { | |
2090 | relay_cleanup_poll_connection(&events, pollfd); | |
2091 | relay_del_connection(relay_connections_ht, | |
2092 | streams_ht, &iter, | |
2093 | relay_connection); | |
2094 | DBG("Data connection closed with %d", pollfd); | |
2095 | /* | |
2096 | * Every goto restart call sets the last seen fd where | |
2097 | * here we don't really care since we gracefully | |
2098 | * continue the loop after the connection is deleted. | |
2099 | */ | |
2100 | } else { | |
2101 | /* Keep last seen port. */ | |
2102 | last_seen_data_fd = pollfd; | |
2103 | rcu_read_unlock(); | |
2104 | goto restart; | |
b8aa1682 JD |
2105 | } |
2106 | } | |
9d1bbf21 | 2107 | rcu_read_unlock(); |
b8aa1682 JD |
2108 | } |
2109 | } | |
beaad64c | 2110 | last_seen_data_fd = -1; |
b8aa1682 JD |
2111 | } |
2112 | ||
095a4ae5 | 2113 | exit: |
b8aa1682 JD |
2114 | error: |
2115 | lttng_poll_clean(&events); | |
2116 | ||
2117 | /* empty the hash table and free the memory */ | |
9d1bbf21 | 2118 | rcu_read_lock(); |
b8aa1682 JD |
2119 | cds_lfht_for_each_entry(relay_connections_ht->ht, &iter.iter, node, node) { |
2120 | node = lttng_ht_iter_get_node_ulong(&iter); | |
2121 | if (node) { | |
2122 | relay_connection = caa_container_of(node, | |
2123 | struct relay_command, sock_n); | |
9d1bbf21 MD |
2124 | relay_del_connection(relay_connections_ht, |
2125 | streams_ht, &iter, | |
2126 | relay_connection); | |
b8aa1682 | 2127 | } |
b8aa1682 | 2128 | } |
9d1bbf21 | 2129 | rcu_read_unlock(); |
b8aa1682 | 2130 | error_poll_create: |
095a4ae5 MD |
2131 | lttng_ht_destroy(streams_ht); |
2132 | streams_ht_error: | |
b8aa1682 | 2133 | lttng_ht_destroy(relay_connections_ht); |
095a4ae5 | 2134 | relay_connections_ht_error: |
6620da75 DG |
2135 | /* Close relay cmd pipes */ |
2136 | utils_close_pipe(relay_cmd_pipe); | |
095a4ae5 MD |
2137 | if (err) { |
2138 | DBG("Thread exited with error"); | |
2139 | } | |
b8aa1682 | 2140 | DBG("Worker thread cleanup complete"); |
095a4ae5 | 2141 | free(data_buffer); |
b8aa1682 | 2142 | stop_threads(); |
9d1bbf21 | 2143 | rcu_unregister_thread(); |
b8aa1682 JD |
2144 | return NULL; |
2145 | } | |
2146 | ||
2147 | /* | |
2148 | * Create the relay command pipe to wake thread_manage_apps. | |
2149 | * Closed in cleanup(). | |
2150 | */ | |
2151 | static int create_relay_cmd_pipe(void) | |
2152 | { | |
a02de639 | 2153 | int ret; |
b8aa1682 | 2154 | |
a02de639 | 2155 | ret = utils_create_pipe_cloexec(relay_cmd_pipe); |
b8aa1682 | 2156 | |
b8aa1682 JD |
2157 | return ret; |
2158 | } | |
2159 | ||
2160 | /* | |
2161 | * main | |
2162 | */ | |
2163 | int main(int argc, char **argv) | |
2164 | { | |
2165 | int ret = 0; | |
2166 | void *status; | |
2167 | ||
2168 | /* Create thread quit pipe */ | |
2169 | if ((ret = init_thread_quit_pipe()) < 0) { | |
2170 | goto error; | |
2171 | } | |
2172 | ||
2173 | /* Parse arguments */ | |
2174 | progname = argv[0]; | |
c617c0c6 | 2175 | if ((ret = parse_args(argc, argv)) < 0) { |
a02de639 | 2176 | goto exit; |
b8aa1682 JD |
2177 | } |
2178 | ||
2179 | if ((ret = set_signal_handler()) < 0) { | |
2180 | goto exit; | |
2181 | } | |
2182 | ||
2183 | /* Daemonize */ | |
2184 | if (opt_daemon) { | |
2185 | ret = daemon(0, 0); | |
2186 | if (ret < 0) { | |
2187 | PERROR("daemon"); | |
a02de639 | 2188 | goto exit; |
b8aa1682 JD |
2189 | } |
2190 | } | |
2191 | ||
2192 | /* Check if daemon is UID = 0 */ | |
2193 | is_root = !getuid(); | |
2194 | ||
2195 | if (!is_root) { | |
2196 | if (control_uri->port < 1024 || data_uri->port < 1024) { | |
2197 | ERR("Need to be root to use ports < 1024"); | |
2198 | ret = -1; | |
a02de639 | 2199 | goto exit; |
b8aa1682 JD |
2200 | } |
2201 | } | |
2202 | ||
2203 | /* Setup the thread apps communication pipe. */ | |
2204 | if ((ret = create_relay_cmd_pipe()) < 0) { | |
2205 | goto exit; | |
2206 | } | |
2207 | ||
2208 | /* Init relay command queue. */ | |
2209 | cds_wfq_init(&relay_cmd_queue.queue); | |
2210 | ||
2211 | /* Set up max poll set size */ | |
2212 | lttng_poll_set_max_size(); | |
2213 | ||
2214 | /* Setup the dispatcher thread */ | |
2215 | ret = pthread_create(&dispatcher_thread, NULL, | |
2216 | relay_thread_dispatcher, (void *) NULL); | |
2217 | if (ret != 0) { | |
2218 | PERROR("pthread_create dispatcher"); | |
2219 | goto exit_dispatcher; | |
2220 | } | |
2221 | ||
2222 | /* Setup the worker thread */ | |
2223 | ret = pthread_create(&worker_thread, NULL, | |
2224 | relay_thread_worker, (void *) NULL); | |
2225 | if (ret != 0) { | |
2226 | PERROR("pthread_create worker"); | |
2227 | goto exit_worker; | |
2228 | } | |
2229 | ||
2230 | /* Setup the listener thread */ | |
2231 | ret = pthread_create(&listener_thread, NULL, | |
2232 | relay_thread_listener, (void *) NULL); | |
2233 | if (ret != 0) { | |
2234 | PERROR("pthread_create listener"); | |
2235 | goto exit_listener; | |
2236 | } | |
2237 | ||
2238 | exit_listener: | |
2239 | ret = pthread_join(listener_thread, &status); | |
2240 | if (ret != 0) { | |
2241 | PERROR("pthread_join"); | |
2242 | goto error; /* join error, exit without cleanup */ | |
2243 | } | |
2244 | ||
2245 | exit_worker: | |
2246 | ret = pthread_join(worker_thread, &status); | |
2247 | if (ret != 0) { | |
2248 | PERROR("pthread_join"); | |
2249 | goto error; /* join error, exit without cleanup */ | |
2250 | } | |
2251 | ||
2252 | exit_dispatcher: | |
2253 | ret = pthread_join(dispatcher_thread, &status); | |
2254 | if (ret != 0) { | |
2255 | PERROR("pthread_join"); | |
2256 | goto error; /* join error, exit without cleanup */ | |
2257 | } | |
2258 | ||
2259 | exit: | |
2260 | cleanup(); | |
2261 | if (!ret) { | |
2262 | exit(EXIT_SUCCESS); | |
2263 | } | |
a02de639 | 2264 | |
b8aa1682 JD |
2265 | error: |
2266 | exit(EXIT_FAILURE); | |
2267 | } |