Commit | Line | Data |
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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> | |
35 | #include <urcu/futex.h> | |
36 | #include <urcu/uatomic.h> | |
37 | #include <unistd.h> | |
38 | #include <fcntl.h> | |
39 | #include <config.h> | |
40 | ||
41 | #include <lttng/lttng.h> | |
42 | #include <common/common.h> | |
43 | #include <common/compat/poll.h> | |
44 | #include <common/compat/socket.h> | |
45 | #include <common/defaults.h> | |
46 | #include <common/futex.h> | |
47 | #include <common/sessiond-comm/sessiond-comm.h> | |
48 | #include <common/sessiond-comm/inet.h> | |
49 | #include <common/hashtable/hashtable.h> | |
50 | #include <common/sessiond-comm/relayd.h> | |
51 | #include <common/uri.h> | |
a02de639 | 52 | #include <common/utils.h> |
b8aa1682 JD |
53 | |
54 | #include "lttng-relayd.h" | |
55 | ||
56 | /* command line options */ | |
57 | static int opt_daemon; | |
58 | static char *opt_output_path; | |
59 | static struct lttng_uri *control_uri = NULL; | |
60 | static struct lttng_uri *data_uri = NULL; | |
61 | ||
62 | const char *progname; | |
63 | static int is_root; /* Set to 1 if the daemon is running as root */ | |
64 | ||
65 | /* | |
66 | * Quit pipe for all threads. This permits a single cancellation point | |
67 | * for all threads when receiving an event on the pipe. | |
68 | */ | |
69 | static int thread_quit_pipe[2] = { -1, -1 }; | |
70 | ||
71 | /* | |
72 | * This pipe is used to inform the worker thread that a command is queued and | |
73 | * ready to be processed. | |
74 | */ | |
75 | static int relay_cmd_pipe[2] = { -1, -1 }; | |
76 | ||
26c9d55e | 77 | /* Shared between threads */ |
b8aa1682 JD |
78 | static int dispatch_thread_exit; |
79 | ||
80 | static pthread_t listener_thread; | |
81 | static pthread_t dispatcher_thread; | |
82 | static pthread_t worker_thread; | |
83 | ||
84 | static uint64_t last_relay_stream_id = 0; | |
85 | static uint64_t last_relay_session_id = 0; | |
86 | ||
87 | /* | |
88 | * Relay command queue. | |
89 | * | |
90 | * The relay_thread_listener and relay_thread_dispatcher communicate with this | |
91 | * queue. | |
92 | */ | |
93 | static struct relay_cmd_queue relay_cmd_queue; | |
94 | ||
95 | /* buffer allocated at startup, used to store the trace data */ | |
96 | static char *data_buffer = NULL; | |
97 | static unsigned int data_buffer_size = 0; | |
98 | ||
99 | /* | |
100 | * usage function on stderr | |
101 | */ | |
102 | static | |
103 | void usage(void) | |
104 | { | |
105 | fprintf(stderr, "Usage: %s OPTIONS\n\nOptions:\n", progname); | |
106 | fprintf(stderr, " -h, --help Display this usage.\n"); | |
107 | fprintf(stderr, " -d, --daemonize Start as a daemon.\n"); | |
108 | fprintf(stderr, " -C, --control-port Control port listening (URI)\n"); | |
109 | fprintf(stderr, " -D, --data-port Data port listening (URI)\n"); | |
25672d02 | 110 | fprintf(stderr, " -o, --output Output path for traces (PATH)\n"); |
b8aa1682 JD |
111 | fprintf(stderr, " -v, --verbose Verbose mode. Activate DBG() macro.\n"); |
112 | } | |
113 | ||
114 | static | |
115 | int parse_args(int argc, char **argv) | |
116 | { | |
117 | int c; | |
118 | int ret = 0; | |
119 | char *default_address; | |
120 | ||
121 | static struct option long_options[] = { | |
e3678fd8 MD |
122 | { "control-port", 1, 0, 'C', }, |
123 | { "data-port", 1, 0, 'D', }, | |
124 | { "daemonize", 0, 0, 'd', }, | |
125 | { "help", 0, 0, 'h', }, | |
126 | { "output", 1, 0, 'o', }, | |
127 | { "verbose", 0, 0, 'v', }, | |
128 | { NULL, 0, 0, 0 }, | |
b8aa1682 JD |
129 | }; |
130 | ||
131 | while (1) { | |
132 | int option_index = 0; | |
133 | c = getopt_long(argc, argv, "dhv" "C:D:o:", | |
134 | long_options, &option_index); | |
135 | if (c == -1) { | |
136 | break; | |
137 | } | |
138 | ||
139 | switch (c) { | |
140 | case 0: | |
141 | fprintf(stderr, "option %s", long_options[option_index].name); | |
142 | if (optarg) { | |
143 | fprintf(stderr, " with arg %s\n", optarg); | |
144 | } | |
145 | break; | |
146 | case 'C': | |
147 | ret = uri_parse(optarg, &control_uri); | |
148 | if (ret < 0) { | |
149 | ERR("Invalid control URI specified"); | |
150 | goto exit; | |
151 | } | |
152 | if (control_uri->port == 0) { | |
153 | control_uri->port = DEFAULT_NETWORK_CONTROL_PORT; | |
154 | } | |
155 | break; | |
156 | case 'D': | |
157 | ret = uri_parse(optarg, &data_uri); | |
158 | if (ret < 0) { | |
159 | ERR("Invalid data URI specified"); | |
160 | goto exit; | |
161 | } | |
162 | if (data_uri->port == 0) { | |
163 | data_uri->port = DEFAULT_NETWORK_DATA_PORT; | |
164 | } | |
165 | break; | |
166 | case 'd': | |
167 | opt_daemon = 1; | |
168 | break; | |
169 | case 'h': | |
170 | usage(); | |
171 | exit(EXIT_FAILURE); | |
172 | case 'o': | |
173 | ret = asprintf(&opt_output_path, "%s", optarg); | |
174 | if (ret < 0) { | |
175 | PERROR("asprintf opt_output_path"); | |
176 | goto exit; | |
177 | } | |
178 | break; | |
179 | case 'v': | |
180 | /* Verbose level can increase using multiple -v */ | |
181 | lttng_opt_verbose += 1; | |
182 | break; | |
183 | default: | |
184 | /* Unknown option or other error. | |
185 | * Error is printed by getopt, just return */ | |
186 | ret = -1; | |
187 | goto exit; | |
188 | } | |
189 | } | |
190 | ||
191 | /* assign default values */ | |
192 | if (control_uri == NULL) { | |
193 | ret = asprintf(&default_address, "tcp://0.0.0.0:%d", | |
194 | DEFAULT_NETWORK_CONTROL_PORT); | |
195 | if (ret < 0) { | |
196 | PERROR("asprintf default data address"); | |
197 | goto exit; | |
198 | } | |
199 | ||
200 | ret = uri_parse(default_address, &control_uri); | |
201 | free(default_address); | |
202 | if (ret < 0) { | |
203 | ERR("Invalid control URI specified"); | |
204 | goto exit; | |
205 | } | |
206 | } | |
207 | if (data_uri == NULL) { | |
208 | ret = asprintf(&default_address, "tcp://0.0.0.0:%d", | |
209 | DEFAULT_NETWORK_DATA_PORT); | |
210 | if (ret < 0) { | |
211 | PERROR("asprintf default data address"); | |
212 | goto exit; | |
213 | } | |
214 | ||
215 | ret = uri_parse(default_address, &data_uri); | |
216 | free(default_address); | |
217 | if (ret < 0) { | |
218 | ERR("Invalid data URI specified"); | |
219 | goto exit; | |
220 | } | |
221 | } | |
222 | ||
223 | exit: | |
224 | return ret; | |
225 | } | |
226 | ||
227 | /* | |
228 | * Cleanup the daemon | |
229 | */ | |
230 | static | |
231 | void cleanup(void) | |
232 | { | |
b8aa1682 JD |
233 | DBG("Cleaning up"); |
234 | ||
a02de639 CB |
235 | /* Close thread quit pipes */ |
236 | utils_close_pipe(thread_quit_pipe); | |
237 | ||
238 | /* Close relay cmd pipes */ | |
239 | utils_close_pipe(relay_cmd_pipe); | |
b8aa1682 JD |
240 | } |
241 | ||
242 | /* | |
243 | * Write to writable pipe used to notify a thread. | |
244 | */ | |
245 | static | |
246 | int notify_thread_pipe(int wpipe) | |
247 | { | |
248 | int ret; | |
249 | ||
6f94560a MD |
250 | do { |
251 | ret = write(wpipe, "!", 1); | |
252 | } while (ret < 0 && errno == EINTR); | |
b8aa1682 JD |
253 | if (ret < 0) { |
254 | PERROR("write poll pipe"); | |
255 | } | |
256 | ||
257 | return ret; | |
258 | } | |
259 | ||
260 | /* | |
261 | * Stop all threads by closing the thread quit pipe. | |
262 | */ | |
263 | static | |
264 | void stop_threads(void) | |
265 | { | |
266 | int ret; | |
267 | ||
268 | /* Stopping all threads */ | |
269 | DBG("Terminating all threads"); | |
270 | ret = notify_thread_pipe(thread_quit_pipe[1]); | |
271 | if (ret < 0) { | |
272 | ERR("write error on thread quit pipe"); | |
273 | } | |
274 | ||
275 | /* Dispatch thread */ | |
26c9d55e | 276 | CMM_STORE_SHARED(dispatch_thread_exit, 1); |
b8aa1682 JD |
277 | futex_nto1_wake(&relay_cmd_queue.futex); |
278 | } | |
279 | ||
280 | /* | |
281 | * Signal handler for the daemon | |
282 | * | |
283 | * Simply stop all worker threads, leaving main() return gracefully after | |
284 | * joining all threads and calling cleanup(). | |
285 | */ | |
286 | static | |
287 | void sighandler(int sig) | |
288 | { | |
289 | switch (sig) { | |
290 | case SIGPIPE: | |
291 | DBG("SIGPIPE caught"); | |
292 | return; | |
293 | case SIGINT: | |
294 | DBG("SIGINT caught"); | |
295 | stop_threads(); | |
296 | break; | |
297 | case SIGTERM: | |
298 | DBG("SIGTERM caught"); | |
299 | stop_threads(); | |
300 | break; | |
301 | default: | |
302 | break; | |
303 | } | |
304 | } | |
305 | ||
306 | /* | |
307 | * Setup signal handler for : | |
308 | * SIGINT, SIGTERM, SIGPIPE | |
309 | */ | |
310 | static | |
311 | int set_signal_handler(void) | |
312 | { | |
313 | int ret = 0; | |
314 | struct sigaction sa; | |
315 | sigset_t sigset; | |
316 | ||
317 | if ((ret = sigemptyset(&sigset)) < 0) { | |
318 | PERROR("sigemptyset"); | |
319 | return ret; | |
320 | } | |
321 | ||
322 | sa.sa_handler = sighandler; | |
323 | sa.sa_mask = sigset; | |
324 | sa.sa_flags = 0; | |
325 | if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) { | |
326 | PERROR("sigaction"); | |
327 | return ret; | |
328 | } | |
329 | ||
330 | if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) { | |
331 | PERROR("sigaction"); | |
332 | return ret; | |
333 | } | |
334 | ||
335 | if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) { | |
336 | PERROR("sigaction"); | |
337 | return ret; | |
338 | } | |
339 | ||
340 | DBG("Signal handler set for SIGTERM, SIGPIPE and SIGINT"); | |
341 | ||
342 | return ret; | |
343 | } | |
344 | ||
345 | /* | |
346 | * Init thread quit pipe. | |
347 | * | |
348 | * Return -1 on error or 0 if all pipes are created. | |
349 | */ | |
350 | static | |
351 | int init_thread_quit_pipe(void) | |
352 | { | |
a02de639 | 353 | int ret; |
b8aa1682 | 354 | |
a02de639 | 355 | ret = utils_create_pipe_cloexec(thread_quit_pipe); |
b8aa1682 | 356 | |
b8aa1682 JD |
357 | return ret; |
358 | } | |
359 | ||
360 | /* | |
361 | * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set. | |
362 | */ | |
363 | static | |
364 | int create_thread_poll_set(struct lttng_poll_event *events, int size) | |
365 | { | |
366 | int ret; | |
367 | ||
368 | if (events == NULL || size == 0) { | |
369 | ret = -1; | |
370 | goto error; | |
371 | } | |
372 | ||
373 | ret = lttng_poll_create(events, size, LTTNG_CLOEXEC); | |
374 | if (ret < 0) { | |
375 | goto error; | |
376 | } | |
377 | ||
378 | /* Add quit pipe */ | |
379 | ret = lttng_poll_add(events, thread_quit_pipe[0], LPOLLIN); | |
380 | if (ret < 0) { | |
381 | goto error; | |
382 | } | |
383 | ||
384 | return 0; | |
385 | ||
386 | error: | |
387 | return ret; | |
388 | } | |
389 | ||
390 | /* | |
391 | * Check if the thread quit pipe was triggered. | |
392 | * | |
393 | * Return 1 if it was triggered else 0; | |
394 | */ | |
395 | static | |
396 | int check_thread_quit_pipe(int fd, uint32_t events) | |
397 | { | |
398 | if (fd == thread_quit_pipe[0] && (events & LPOLLIN)) { | |
399 | return 1; | |
400 | } | |
401 | ||
402 | return 0; | |
403 | } | |
404 | ||
405 | /* | |
406 | * Create and init socket from uri. | |
407 | */ | |
408 | static | |
409 | struct lttcomm_sock *relay_init_sock(struct lttng_uri *uri) | |
410 | { | |
411 | int ret; | |
412 | struct lttcomm_sock *sock = NULL; | |
413 | ||
414 | sock = lttcomm_alloc_sock_from_uri(uri); | |
415 | if (sock == NULL) { | |
416 | ERR("Allocating socket"); | |
417 | goto error; | |
418 | } | |
419 | ||
420 | ret = lttcomm_create_sock(sock); | |
421 | if (ret < 0) { | |
422 | goto error; | |
423 | } | |
424 | DBG("Listening on sock %d", sock->fd); | |
425 | ||
426 | ret = sock->ops->bind(sock); | |
427 | if (ret < 0) { | |
428 | goto error; | |
429 | } | |
430 | ||
431 | ret = sock->ops->listen(sock, -1); | |
432 | if (ret < 0) { | |
433 | goto error; | |
434 | ||
435 | } | |
436 | ||
437 | return sock; | |
438 | ||
439 | error: | |
440 | if (sock) { | |
441 | lttcomm_destroy_sock(sock); | |
442 | } | |
443 | return NULL; | |
444 | } | |
445 | ||
446 | /* | |
447 | * This thread manages the listening for new connections on the network | |
448 | */ | |
449 | static | |
450 | void *relay_thread_listener(void *data) | |
451 | { | |
452 | int i, ret, pollfd; | |
453 | int val = 1; | |
454 | uint32_t revents, nb_fd; | |
455 | struct lttng_poll_event events; | |
456 | struct lttcomm_sock *control_sock, *data_sock; | |
457 | ||
458 | /* | |
459 | * Get allocated in this thread, enqueued to a global queue, dequeued and | |
460 | * freed in the worker thread. | |
461 | */ | |
462 | struct relay_command *relay_cmd = NULL; | |
463 | ||
464 | DBG("[thread] Relay listener started"); | |
465 | ||
466 | control_sock = relay_init_sock(control_uri); | |
467 | if (!control_sock) { | |
468 | goto error_sock; | |
469 | } | |
470 | ||
471 | data_sock = relay_init_sock(data_uri); | |
472 | if (!data_sock) { | |
473 | goto error_sock; | |
474 | } | |
475 | ||
476 | /* | |
477 | * Pass 3 as size here for the thread quit pipe, control and data socket. | |
478 | */ | |
479 | ret = create_thread_poll_set(&events, 3); | |
480 | if (ret < 0) { | |
481 | goto error_create_poll; | |
482 | } | |
483 | ||
484 | /* Add the control socket */ | |
485 | ret = lttng_poll_add(&events, control_sock->fd, LPOLLIN | LPOLLRDHUP); | |
486 | if (ret < 0) { | |
487 | goto error_poll_add; | |
488 | } | |
489 | ||
490 | /* Add the data socket */ | |
491 | ret = lttng_poll_add(&events, data_sock->fd, LPOLLIN | LPOLLRDHUP); | |
492 | if (ret < 0) { | |
493 | goto error_poll_add; | |
494 | } | |
495 | ||
496 | while (1) { | |
497 | DBG("Listener accepting connections"); | |
498 | ||
499 | nb_fd = LTTNG_POLL_GETNB(&events); | |
500 | ||
501 | restart: | |
502 | ret = lttng_poll_wait(&events, -1); | |
503 | if (ret < 0) { | |
504 | /* | |
505 | * Restart interrupted system call. | |
506 | */ | |
507 | if (errno == EINTR) { | |
508 | goto restart; | |
509 | } | |
510 | goto error; | |
511 | } | |
512 | ||
513 | DBG("Relay new connection received"); | |
514 | for (i = 0; i < nb_fd; i++) { | |
515 | /* Fetch once the poll data */ | |
516 | revents = LTTNG_POLL_GETEV(&events, i); | |
517 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
518 | ||
519 | /* Thread quit pipe has been closed. Killing thread. */ | |
520 | ret = check_thread_quit_pipe(pollfd, revents); | |
521 | if (ret) { | |
522 | goto error; | |
523 | } | |
524 | ||
525 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
526 | ERR("socket poll error"); | |
527 | goto error; | |
528 | } else if (revents & LPOLLIN) { | |
529 | struct lttcomm_sock *newsock = NULL; | |
530 | ||
531 | relay_cmd = zmalloc(sizeof(struct relay_command)); | |
532 | if (relay_cmd == NULL) { | |
533 | PERROR("relay command zmalloc"); | |
534 | goto error; | |
535 | } | |
536 | ||
537 | if (pollfd == data_sock->fd) { | |
538 | newsock = data_sock->ops->accept(data_sock); | |
539 | if (newsock < 0) { | |
540 | PERROR("accepting data sock"); | |
541 | goto error; | |
542 | } | |
543 | relay_cmd->type = RELAY_DATA; | |
544 | DBG("Relay data connection accepted, socket %d", newsock->fd); | |
545 | } else if (pollfd == control_sock->fd) { | |
546 | newsock = control_sock->ops->accept(control_sock); | |
547 | if (newsock < 0) { | |
548 | PERROR("accepting control sock"); | |
549 | goto error; | |
550 | } | |
551 | relay_cmd->type = RELAY_CONTROL; | |
552 | DBG("Relay control connection accepted, socket %d", newsock->fd); | |
553 | } | |
554 | ret = setsockopt(newsock->fd, SOL_SOCKET, SO_REUSEADDR, | |
555 | &val, sizeof(int)); | |
556 | if (ret < 0) { | |
557 | PERROR("setsockopt inet"); | |
558 | goto error; | |
559 | } | |
560 | relay_cmd->sock = newsock; | |
561 | /* | |
562 | * Lock free enqueue the request. | |
563 | */ | |
564 | cds_wfq_enqueue(&relay_cmd_queue.queue, &relay_cmd->node); | |
565 | ||
566 | /* | |
567 | * Wake the dispatch queue futex. Implicit memory | |
568 | * barrier with the exchange in cds_wfq_enqueue. | |
569 | */ | |
570 | futex_nto1_wake(&relay_cmd_queue.futex); | |
571 | } | |
572 | } | |
573 | } | |
574 | ||
575 | error: | |
576 | error_poll_add: | |
577 | lttng_poll_clean(&events); | |
578 | error_create_poll: | |
579 | if (control_sock->fd >= 0) { | |
580 | ret = control_sock->ops->close(control_sock); | |
581 | if (ret) { | |
582 | PERROR("close"); | |
583 | } | |
584 | lttcomm_destroy_sock(control_sock); | |
585 | } | |
586 | if (data_sock->fd >= 0) { | |
587 | ret = data_sock->ops->close(data_sock); | |
588 | if (ret) { | |
589 | PERROR("close"); | |
590 | } | |
591 | lttcomm_destroy_sock(data_sock); | |
592 | } | |
593 | ||
594 | DBG("Relay listener thread cleanup complete"); | |
595 | stop_threads(); | |
596 | error_sock: | |
597 | return NULL; | |
598 | } | |
599 | ||
600 | /* | |
601 | * This thread manages the dispatching of the requests to worker threads | |
602 | */ | |
603 | static | |
604 | void *relay_thread_dispatcher(void *data) | |
605 | { | |
606 | int ret; | |
607 | struct cds_wfq_node *node; | |
608 | struct relay_command *relay_cmd = NULL; | |
609 | ||
610 | DBG("[thread] Relay dispatcher started"); | |
611 | ||
26c9d55e | 612 | while (!CMM_LOAD_SHARED(dispatch_thread_exit)) { |
b8aa1682 JD |
613 | /* Atomically prepare the queue futex */ |
614 | futex_nto1_prepare(&relay_cmd_queue.futex); | |
615 | ||
616 | do { | |
617 | /* Dequeue commands */ | |
618 | node = cds_wfq_dequeue_blocking(&relay_cmd_queue.queue); | |
619 | if (node == NULL) { | |
620 | DBG("Woken up but nothing in the relay command queue"); | |
621 | /* Continue thread execution */ | |
622 | break; | |
623 | } | |
624 | ||
625 | relay_cmd = caa_container_of(node, struct relay_command, node); | |
626 | DBG("Dispatching request waiting on sock %d", relay_cmd->sock->fd); | |
627 | ||
628 | /* | |
629 | * Inform worker thread of the new request. This | |
630 | * call is blocking so we can be assured that the data will be read | |
631 | * at some point in time or wait to the end of the world :) | |
632 | */ | |
6f94560a MD |
633 | do { |
634 | ret = write(relay_cmd_pipe[1], relay_cmd, | |
635 | sizeof(struct relay_command)); | |
636 | } while (ret < 0 && errno == EINTR); | |
b8aa1682 JD |
637 | free(relay_cmd); |
638 | if (ret < 0) { | |
639 | PERROR("write cmd pipe"); | |
640 | goto error; | |
641 | } | |
642 | } while (node != NULL); | |
643 | ||
644 | /* Futex wait on queue. Blocking call on futex() */ | |
645 | futex_nto1_wait(&relay_cmd_queue.futex); | |
646 | } | |
647 | ||
648 | error: | |
649 | DBG("Dispatch thread dying"); | |
650 | stop_threads(); | |
651 | return NULL; | |
652 | } | |
653 | ||
654 | /* | |
655 | * Return the realpath(3) of the path even if the last directory token does not | |
656 | * exist. For example, with /tmp/test1/test2, if test2/ does not exist but the | |
657 | * /tmp/test1 does, the real path is returned. In normal time, realpath(3) | |
658 | * fails if the end point directory does not exist. | |
659 | */ | |
660 | static | |
661 | char *expand_full_path(const char *path) | |
662 | { | |
663 | const char *end_path = path; | |
664 | char *next, *cut_path, *expanded_path; | |
665 | ||
666 | /* Find last token delimited by '/' */ | |
667 | while ((next = strpbrk(end_path + 1, "/"))) { | |
668 | end_path = next; | |
669 | } | |
670 | ||
671 | /* Cut last token from original path */ | |
672 | cut_path = strndup(path, end_path - path); | |
673 | ||
674 | expanded_path = malloc(PATH_MAX); | |
675 | if (expanded_path == NULL) { | |
676 | goto error; | |
677 | } | |
678 | ||
679 | expanded_path = realpath((char *)cut_path, expanded_path); | |
680 | if (expanded_path == NULL) { | |
681 | switch (errno) { | |
682 | case ENOENT: | |
683 | ERR("%s: No such file or directory", cut_path); | |
684 | break; | |
685 | default: | |
686 | PERROR("realpath"); | |
687 | break; | |
688 | } | |
689 | goto error; | |
690 | } | |
691 | ||
692 | /* Add end part to expanded path */ | |
693 | strcat(expanded_path, end_path); | |
694 | ||
695 | free(cut_path); | |
696 | return expanded_path; | |
697 | ||
698 | error: | |
699 | free(cut_path); | |
700 | return NULL; | |
701 | } | |
702 | ||
703 | ||
704 | /* | |
705 | * config_get_default_path | |
706 | * | |
707 | * Returns the HOME directory path. Caller MUST NOT free(3) the return pointer. | |
708 | */ | |
709 | static | |
710 | char *config_get_default_path(void) | |
711 | { | |
712 | return getenv("HOME"); | |
713 | } | |
714 | ||
715 | /* | |
716 | * Create recursively directory using the FULL path. | |
717 | */ | |
718 | static | |
719 | int mkdir_recursive(char *path, mode_t mode) | |
720 | { | |
721 | char *p, tmp[PATH_MAX]; | |
722 | struct stat statbuf; | |
723 | size_t len; | |
724 | int ret; | |
725 | ||
726 | ret = snprintf(tmp, sizeof(tmp), "%s", path); | |
727 | if (ret < 0) { | |
728 | PERROR("snprintf mkdir"); | |
729 | goto error; | |
730 | } | |
731 | ||
732 | len = ret; | |
733 | if (tmp[len - 1] == '/') { | |
734 | tmp[len - 1] = 0; | |
735 | } | |
736 | ||
737 | for (p = tmp + 1; *p; p++) { | |
738 | if (*p == '/') { | |
739 | *p = 0; | |
740 | if (tmp[strlen(tmp) - 1] == '.' && | |
741 | tmp[strlen(tmp) - 2] == '.' && | |
742 | tmp[strlen(tmp) - 3] == '/') { | |
743 | ERR("Using '/../' is not permitted in the trace path (%s)", | |
744 | tmp); | |
745 | ret = -1; | |
746 | goto error; | |
747 | } | |
748 | ret = stat(tmp, &statbuf); | |
749 | if (ret < 0) { | |
750 | ret = mkdir(tmp, mode); | |
751 | if (ret < 0) { | |
752 | if (!(errno == EEXIST)) { | |
753 | PERROR("mkdir recursive"); | |
754 | ret = -errno; | |
755 | goto error; | |
756 | } | |
757 | } | |
758 | } | |
759 | *p = '/'; | |
760 | } | |
761 | } | |
762 | ||
763 | ret = mkdir(tmp, mode); | |
764 | if (ret < 0) { | |
765 | if (!(errno == EEXIST)) { | |
766 | PERROR("mkdir recursive last piece"); | |
767 | ret = -errno; | |
768 | } else { | |
769 | ret = 0; | |
770 | } | |
771 | } | |
772 | ||
773 | error: | |
774 | return ret; | |
775 | } | |
776 | ||
777 | /* | |
778 | * create_output_path: create the output trace directory | |
779 | */ | |
780 | static | |
781 | char *create_output_path(char *path_name) | |
782 | { | |
783 | int ret = 0; | |
784 | char *alloc_path = NULL; | |
785 | char *traces_path = NULL; | |
786 | char *full_path = NULL; | |
787 | ||
788 | /* Auto output path */ | |
789 | if (opt_output_path == NULL) { | |
790 | alloc_path = strdup(config_get_default_path()); | |
791 | if (alloc_path == NULL) { | |
792 | ERR("Home path not found.\n \ | |
793 | Please specify an output path using -o, --output PATH"); | |
794 | ret = -1; | |
795 | goto exit; | |
796 | } | |
797 | ||
798 | ret = asprintf(&traces_path, "%s/" DEFAULT_TRACE_DIR_NAME | |
799 | "/%s", alloc_path, path_name); | |
800 | if (ret < 0) { | |
801 | PERROR("asprintf trace dir name"); | |
802 | goto exit; | |
803 | } | |
804 | } else { | |
805 | full_path = expand_full_path(opt_output_path); | |
806 | ret = asprintf(&traces_path, "%s/%s", full_path, path_name); | |
807 | if (ret < 0) { | |
808 | PERROR("asprintf trace dir name"); | |
809 | goto exit; | |
810 | } | |
811 | } | |
812 | free(alloc_path); | |
813 | free(full_path); | |
814 | ||
815 | exit: | |
816 | return traces_path; | |
817 | } | |
818 | ||
819 | /* | |
820 | * relay_delete_session: Free all memory associated with a session and | |
821 | * close all the FDs | |
822 | */ | |
823 | static | |
824 | void relay_delete_session(struct relay_command *cmd, struct lttng_ht *streams_ht) | |
825 | { | |
826 | struct lttng_ht_iter iter; | |
827 | struct lttng_ht_node_ulong *node; | |
828 | struct relay_stream *stream; | |
829 | int ret; | |
830 | ||
831 | if (!cmd->session) | |
832 | return; | |
833 | ||
834 | DBG("Relay deleting session %lu", cmd->session->id); | |
835 | free(cmd->session->sock); | |
836 | ||
837 | cds_lfht_for_each_entry(streams_ht->ht, &iter.iter, node, node) { | |
838 | node = lttng_ht_iter_get_node_ulong(&iter); | |
839 | if (node) { | |
840 | stream = caa_container_of(node, | |
841 | struct relay_stream, stream_n); | |
842 | if (stream->session == cmd->session) { | |
843 | close(stream->fd); | |
844 | ret = lttng_ht_del(streams_ht, &iter); | |
845 | assert(!ret); | |
846 | free(stream); | |
847 | } | |
848 | } | |
849 | } | |
850 | } | |
851 | ||
852 | /* | |
853 | * relay_add_stream: allocate a new stream for a session | |
854 | */ | |
855 | static | |
856 | int relay_add_stream(struct lttcomm_relayd_hdr *recv_hdr, | |
857 | struct relay_command *cmd, struct lttng_ht *streams_ht) | |
858 | { | |
859 | struct relay_session *session = cmd->session; | |
860 | struct lttcomm_relayd_add_stream stream_info; | |
861 | struct relay_stream *stream = NULL; | |
862 | struct lttcomm_relayd_status_stream reply; | |
863 | char *path = NULL, *root_path = NULL; | |
864 | int ret, send_ret; | |
865 | ||
866 | if (!session || session->version_check_done == 0) { | |
867 | ERR("Trying to add a stream before version check"); | |
868 | ret = -1; | |
869 | goto end_no_session; | |
870 | } | |
871 | ||
872 | /* FIXME : use data_size for something ? */ | |
873 | ret = cmd->sock->ops->recvmsg(cmd->sock, &stream_info, | |
874 | sizeof(struct lttcomm_relayd_add_stream), MSG_WAITALL); | |
875 | if (ret < sizeof(struct lttcomm_relayd_add_stream)) { | |
876 | ERR("Relay didn't receive valid add_stream struct size : %d", ret); | |
877 | ret = -1; | |
878 | goto end_no_session; | |
879 | } | |
880 | stream = zmalloc(sizeof(struct relay_stream)); | |
881 | if (stream == NULL) { | |
882 | PERROR("relay stream zmalloc"); | |
883 | ret = -1; | |
884 | goto end_no_session; | |
885 | } | |
886 | ||
887 | stream->stream_handle = ++last_relay_stream_id; | |
888 | stream->seq = 0; | |
889 | stream->session = session; | |
890 | ||
891 | root_path = create_output_path(stream_info.pathname); | |
892 | if (!root_path) { | |
893 | ret = -1; | |
894 | goto end; | |
895 | } | |
896 | ret = mkdir_recursive(root_path, S_IRWXU | S_IRWXG); | |
897 | if (ret < 0) { | |
898 | free(root_path); | |
899 | ERR("relay creating output directory"); | |
900 | goto end; | |
901 | } | |
902 | ||
903 | ret = asprintf(&path, "%s/%s", root_path, stream_info.channel_name); | |
904 | if (ret < 0) { | |
905 | PERROR("asprintf stream path"); | |
906 | goto end; | |
907 | } | |
908 | ||
909 | ret = open(path, O_WRONLY|O_CREAT|O_TRUNC, S_IRWXU|S_IRWXG|S_IRWXO); | |
910 | if (ret < 0) { | |
911 | PERROR("Relay creating trace file"); | |
912 | goto end; | |
913 | } | |
914 | ||
915 | stream->fd = ret; | |
916 | DBG("Tracefile %s created", path); | |
917 | ||
918 | lttng_ht_node_init_ulong(&stream->stream_n, | |
919 | (unsigned long) stream->stream_handle); | |
920 | lttng_ht_add_unique_ulong(streams_ht, | |
921 | &stream->stream_n); | |
922 | ||
923 | DBG("Relay new stream added %s", stream_info.channel_name); | |
924 | ||
925 | end: | |
926 | free(path); | |
927 | free(root_path); | |
928 | /* send the session id to the client or a negative return code on error */ | |
929 | if (ret < 0) { | |
930 | reply.ret_code = htobe32(LTTCOMM_ERR); | |
931 | } else { | |
932 | reply.ret_code = htobe32(LTTCOMM_OK); | |
933 | } | |
934 | reply.handle = htobe64(stream->stream_handle); | |
935 | send_ret = cmd->sock->ops->sendmsg(cmd->sock, &reply, | |
936 | sizeof(struct lttcomm_relayd_status_stream), 0); | |
937 | if (send_ret < 0) { | |
938 | ERR("Relay sending stream id"); | |
939 | } | |
940 | ||
941 | end_no_session: | |
942 | return ret; | |
943 | } | |
944 | ||
945 | /* | |
946 | * relay_unknown_command: send -1 if received unknown command | |
947 | */ | |
948 | static | |
949 | void relay_unknown_command(struct relay_command *cmd) | |
950 | { | |
951 | struct lttcomm_relayd_generic_reply reply; | |
952 | int ret; | |
953 | ||
954 | reply.ret_code = htobe32(LTTCOMM_ERR); | |
955 | ret = cmd->sock->ops->sendmsg(cmd->sock, &reply, | |
956 | sizeof(struct lttcomm_relayd_generic_reply), 0); | |
957 | if (ret < 0) { | |
958 | ERR("Relay sending unknown command"); | |
959 | } | |
960 | } | |
961 | ||
962 | /* | |
963 | * relay_start: send an acknowledgment to the client to tell if we are | |
964 | * ready to receive data. We are ready if a session is established. | |
965 | */ | |
966 | static | |
967 | int relay_start(struct lttcomm_relayd_hdr *recv_hdr, | |
968 | struct relay_command *cmd) | |
969 | { | |
970 | int ret = htobe32(LTTCOMM_OK); | |
971 | struct lttcomm_relayd_generic_reply reply; | |
972 | struct relay_session *session = cmd->session; | |
973 | ||
974 | if (!session) { | |
975 | DBG("Trying to start the streaming without a session established"); | |
976 | ret = htobe32(LTTCOMM_ERR); | |
977 | } | |
978 | ||
979 | reply.ret_code = ret; | |
980 | ret = cmd->sock->ops->sendmsg(cmd->sock, &reply, | |
981 | sizeof(struct lttcomm_relayd_generic_reply), 0); | |
982 | if (ret < 0) { | |
983 | ERR("Relay sending start ack"); | |
984 | } | |
985 | ||
986 | return ret; | |
987 | } | |
988 | ||
989 | /* | |
990 | * Get stream from stream id. | |
991 | */ | |
992 | static | |
993 | struct relay_stream *relay_stream_from_stream_id(uint64_t stream_id, | |
994 | struct lttng_ht *streams_ht) | |
995 | { | |
996 | struct lttng_ht_node_ulong *node; | |
997 | struct lttng_ht_iter iter; | |
998 | struct relay_stream *ret; | |
999 | ||
1000 | lttng_ht_lookup(streams_ht, | |
1001 | (void *)((unsigned long) stream_id), | |
1002 | &iter); | |
1003 | node = lttng_ht_iter_get_node_ulong(&iter); | |
1004 | if (node == NULL) { | |
1005 | DBG("Relay stream %lu not found", stream_id); | |
1006 | ret = NULL; | |
1007 | goto end; | |
1008 | } | |
1009 | ||
1010 | ret = caa_container_of(node, struct relay_stream, stream_n); | |
1011 | ||
1012 | end: | |
1013 | return ret; | |
1014 | } | |
1015 | ||
1016 | /* | |
1017 | * relay_recv_metadata: receive the metada for the session. | |
1018 | */ | |
1019 | static | |
1020 | int relay_recv_metadata(struct lttcomm_relayd_hdr *recv_hdr, | |
1021 | struct relay_command *cmd, struct lttng_ht *streams_ht) | |
1022 | { | |
1023 | int ret = htobe32(LTTCOMM_OK); | |
1024 | struct relay_session *session = cmd->session; | |
1025 | struct lttcomm_relayd_metadata_payload *metadata_struct; | |
1026 | struct relay_stream *metadata_stream; | |
1027 | uint64_t data_size, payload_size; | |
1028 | ||
1029 | if (!session) { | |
1030 | ERR("Metadata sent before version check"); | |
1031 | ret = -1; | |
1032 | goto end; | |
1033 | } | |
1034 | ||
1035 | data_size = be64toh(recv_hdr->data_size); | |
1036 | payload_size = data_size - sizeof(uint64_t); | |
1037 | if (data_buffer_size < data_size) { | |
1038 | data_buffer = realloc(data_buffer, data_size); | |
1039 | if (!data_buffer) { | |
1040 | ERR("Allocating data buffer"); | |
1041 | ret = -1; | |
1042 | goto end; | |
1043 | } | |
1044 | data_buffer_size = data_size; | |
1045 | } | |
1046 | memset(data_buffer, 0, data_size); | |
1047 | DBG2("Relay receiving metadata, waiting for %lu bytes", data_size); | |
1048 | ret = cmd->sock->ops->recvmsg(cmd->sock, data_buffer, data_size, MSG_WAITALL); | |
1049 | if (ret < 0 || ret != data_size) { | |
1050 | ret = -1; | |
1051 | ERR("Relay didn't receive the whole metadata"); | |
1052 | goto end; | |
1053 | } | |
1054 | metadata_struct = (struct lttcomm_relayd_metadata_payload *) data_buffer; | |
1055 | metadata_stream = relay_stream_from_stream_id( | |
1056 | be64toh(metadata_struct->stream_id), streams_ht); | |
1057 | if (!metadata_stream) { | |
1058 | ret = -1; | |
1059 | goto end; | |
1060 | } | |
1061 | ||
6f94560a MD |
1062 | do { |
1063 | ret = write(metadata_stream->fd, metadata_struct->payload, | |
1064 | payload_size); | |
1065 | } while (ret < 0 && errno == EINTR); | |
b8aa1682 JD |
1066 | if (ret < (payload_size)) { |
1067 | ERR("Relay error writing metadata on file"); | |
1068 | ret = -1; | |
1069 | goto end; | |
1070 | } | |
1071 | DBG2("Relay metadata written"); | |
1072 | ||
1073 | end: | |
1074 | return ret; | |
1075 | } | |
1076 | ||
1077 | /* | |
1078 | * relay_send_version: send relayd version number | |
1079 | */ | |
1080 | static | |
1081 | int relay_send_version(struct lttcomm_relayd_hdr *recv_hdr, | |
1082 | struct relay_command *cmd) | |
1083 | { | |
1084 | int ret = htobe32(LTTCOMM_OK); | |
1085 | struct lttcomm_relayd_version reply; | |
1086 | struct relay_session *session = NULL; | |
1087 | ||
1088 | if (cmd->session == NULL) { | |
1089 | session = zmalloc(sizeof(struct relay_session)); | |
1090 | if (session == NULL) { | |
1091 | PERROR("relay session zmalloc"); | |
1092 | ret = -1; | |
1093 | goto end; | |
1094 | } | |
1095 | session->id = ++last_relay_session_id; | |
1096 | DBG("Created session %lu", session->id); | |
1097 | cmd->session = session; | |
1098 | } | |
1099 | session->version_check_done = 1; | |
1100 | ||
1101 | sscanf(VERSION, "%u.%u", &reply.major, &reply.minor); | |
1102 | reply.major = htobe32(reply.major); | |
1103 | reply.minor = htobe32(reply.minor); | |
1104 | ret = cmd->sock->ops->sendmsg(cmd->sock, &reply, | |
1105 | sizeof(struct lttcomm_relayd_version), 0); | |
1106 | if (ret < 0) { | |
1107 | ERR("Relay sending version"); | |
1108 | } | |
1109 | DBG("Version check done"); | |
1110 | ||
1111 | end: | |
1112 | return ret; | |
1113 | } | |
1114 | ||
1115 | /* | |
1116 | * relay_process_control: Process the commands received on the control socket | |
1117 | */ | |
1118 | static | |
1119 | int relay_process_control(struct lttcomm_relayd_hdr *recv_hdr, | |
1120 | struct relay_command *cmd, struct lttng_ht *streams_ht) | |
1121 | { | |
1122 | int ret = 0; | |
1123 | ||
1124 | switch (be32toh(recv_hdr->cmd)) { | |
1125 | /* | |
1126 | case RELAYD_CREATE_SESSION: | |
1127 | ret = relay_create_session(recv_hdr, cmd); | |
1128 | break; | |
1129 | */ | |
1130 | case RELAYD_ADD_STREAM: | |
1131 | ret = relay_add_stream(recv_hdr, cmd, streams_ht); | |
1132 | break; | |
1133 | case RELAYD_START_DATA: | |
1134 | ret = relay_start(recv_hdr, cmd); | |
1135 | break; | |
1136 | case RELAYD_SEND_METADATA: | |
1137 | ret = relay_recv_metadata(recv_hdr, cmd, streams_ht); | |
1138 | break; | |
1139 | case RELAYD_VERSION: | |
1140 | ret = relay_send_version(recv_hdr, cmd); | |
1141 | break; | |
1142 | case RELAYD_UPDATE_SYNC_INFO: | |
1143 | default: | |
1144 | ERR("Received unknown command (%u)", be32toh(recv_hdr->cmd)); | |
1145 | relay_unknown_command(cmd); | |
1146 | ret = -1; | |
1147 | goto end; | |
1148 | } | |
1149 | ||
1150 | end: | |
1151 | return ret; | |
1152 | } | |
1153 | ||
1154 | /* | |
1155 | * relay_process_data: Process the data received on the data socket | |
1156 | */ | |
1157 | static | |
1158 | int relay_process_data(struct relay_command *cmd, struct lttng_ht *streams_ht) | |
1159 | { | |
1160 | int ret = 0; | |
1161 | struct relay_stream *stream; | |
1162 | struct lttcomm_relayd_data_hdr data_hdr; | |
1163 | uint64_t stream_id; | |
1164 | uint32_t data_size; | |
1165 | ||
1166 | ret = cmd->sock->ops->recvmsg(cmd->sock, &data_hdr, | |
1167 | sizeof(struct lttcomm_relayd_data_hdr), MSG_WAITALL); | |
1168 | if (ret <= 0) { | |
1169 | ERR("Connections seems to be closed"); | |
1170 | ret = -1; | |
1171 | goto end; | |
1172 | } | |
1173 | ||
1174 | stream_id = be64toh(data_hdr.stream_id); | |
1175 | stream = relay_stream_from_stream_id(stream_id, streams_ht); | |
1176 | if (!stream) { | |
1177 | ret = -1; | |
1178 | goto end; | |
1179 | } | |
1180 | ||
1181 | data_size = be32toh(data_hdr.data_size); | |
1182 | if (data_buffer_size < data_size) { | |
1183 | data_buffer = realloc(data_buffer, data_size); | |
1184 | if (!data_buffer) { | |
1185 | ERR("Allocating data buffer"); | |
1186 | ret = -1; | |
1187 | goto end; | |
1188 | } | |
1189 | data_buffer_size = data_size; | |
1190 | } | |
1191 | memset(data_buffer, 0, data_size); | |
1192 | ||
1193 | ret = cmd->sock->ops->recvmsg(cmd->sock, data_buffer, data_size, MSG_WAITALL); | |
1194 | if (ret <= 0) { | |
1195 | ret = -1; | |
1196 | goto end; | |
1197 | } | |
1198 | ||
6f94560a MD |
1199 | do { |
1200 | ret = write(stream->fd, data_buffer, data_size); | |
1201 | } while (ret < 0 && errno == EINTR); | |
b8aa1682 JD |
1202 | if (ret < data_size) { |
1203 | ERR("Relay error writing data to file"); | |
1204 | ret = -1; | |
1205 | goto end; | |
1206 | } | |
1207 | DBG2("Relay wrote %d bytes to tracefile for stream id %lu", ret, stream->stream_handle); | |
1208 | ||
1209 | end: | |
1210 | return ret; | |
1211 | } | |
1212 | ||
1213 | static | |
1214 | void relay_cleanup_connection(struct lttng_ht *relay_connections_ht, struct lttng_poll_event *events, | |
1215 | struct lttng_ht *streams_ht, int pollfd, struct lttng_ht_iter *iter) | |
1216 | { | |
1217 | int ret; | |
1218 | ||
1219 | ret = lttng_ht_del(relay_connections_ht, iter); | |
1220 | assert(!ret); | |
1221 | lttng_poll_del(events, pollfd); | |
1222 | ||
1223 | ret = close(pollfd); | |
1224 | if (ret < 0) { | |
1225 | ERR("Closing pollfd %d", pollfd); | |
1226 | } | |
1227 | } | |
1228 | ||
1229 | static | |
1230 | int relay_add_connection(int fd, struct lttng_poll_event *events, | |
1231 | struct lttng_ht *relay_connections_ht) | |
1232 | { | |
1233 | int ret; | |
1234 | struct relay_command *relay_connection; | |
1235 | ||
1236 | relay_connection = zmalloc(sizeof(struct relay_command)); | |
1237 | if (relay_connection == NULL) { | |
1238 | PERROR("Relay command zmalloc"); | |
1239 | ret = -1; | |
1240 | goto end; | |
1241 | } | |
1242 | ret = read(fd, relay_connection, sizeof(struct relay_command)); | |
1243 | if (ret < 0 || ret < sizeof(relay_connection)) { | |
1244 | PERROR("read relay cmd pipe"); | |
1245 | ret = -1; | |
1246 | goto end; | |
1247 | } | |
1248 | ||
1249 | lttng_ht_node_init_ulong(&relay_connection->sock_n, | |
1250 | (unsigned long) relay_connection->sock->fd); | |
1251 | lttng_ht_add_unique_ulong(relay_connections_ht, | |
1252 | &relay_connection->sock_n); | |
1253 | ret = lttng_poll_add(events, | |
1254 | relay_connection->sock->fd, | |
1255 | LPOLLIN | LPOLLRDHUP); | |
1256 | ||
1257 | end: | |
1258 | return ret; | |
1259 | } | |
1260 | ||
1261 | /* | |
1262 | * This thread does the actual work | |
1263 | */ | |
1264 | static | |
1265 | void *relay_thread_worker(void *data) | |
1266 | { | |
1267 | int i, ret, pollfd; | |
1268 | uint32_t revents, nb_fd; | |
1269 | struct relay_command *relay_connection; | |
1270 | struct lttng_poll_event events; | |
1271 | struct lttng_ht *relay_connections_ht; | |
1272 | struct lttng_ht_node_ulong *node; | |
1273 | struct lttng_ht_iter iter; | |
1274 | struct lttng_ht *streams_ht; | |
1275 | struct lttcomm_relayd_hdr recv_hdr; | |
1276 | ||
1277 | DBG("[thread] Relay worker started"); | |
1278 | ||
1279 | /* table of connections indexed on socket */ | |
1280 | relay_connections_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); | |
1281 | ||
1282 | /* tables of streams indexed by stream ID */ | |
1283 | streams_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); | |
1284 | ||
1285 | ret = create_thread_poll_set(&events, 2); | |
1286 | if (ret < 0) { | |
1287 | goto error_poll_create; | |
1288 | } | |
1289 | ||
1290 | ret = lttng_poll_add(&events, relay_cmd_pipe[0], LPOLLIN | LPOLLRDHUP); | |
1291 | if (ret < 0) { | |
1292 | goto error; | |
1293 | } | |
1294 | ||
1295 | while (1) { | |
1296 | /* Zeroed the events structure */ | |
1297 | lttng_poll_reset(&events); | |
1298 | ||
1299 | nb_fd = LTTNG_POLL_GETNB(&events); | |
1300 | ||
1301 | /* Infinite blocking call, waiting for transmission */ | |
1302 | restart: | |
1303 | ret = lttng_poll_wait(&events, -1); | |
1304 | if (ret < 0) { | |
1305 | /* | |
1306 | * Restart interrupted system call. | |
1307 | */ | |
1308 | if (errno == EINTR) { | |
1309 | goto restart; | |
1310 | } | |
1311 | goto error; | |
1312 | } | |
1313 | ||
1314 | for (i = 0; i < nb_fd; i++) { | |
1315 | /* Fetch once the poll data */ | |
1316 | revents = LTTNG_POLL_GETEV(&events, i); | |
1317 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
1318 | ||
1319 | /* Thread quit pipe has been closed. Killing thread. */ | |
1320 | ret = check_thread_quit_pipe(pollfd, revents); | |
1321 | if (ret) { | |
1322 | goto error; | |
1323 | } | |
1324 | ||
1325 | /* Inspect the relay cmd pipe for new connection */ | |
1326 | if (pollfd == relay_cmd_pipe[0]) { | |
1327 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
1328 | ERR("Relay pipe error"); | |
1329 | goto error; | |
1330 | } else if (revents & LPOLLIN) { | |
1331 | DBG("Relay command received"); | |
1332 | ret = relay_add_connection(relay_cmd_pipe[0], | |
1333 | &events, relay_connections_ht); | |
1334 | if (ret < 0) { | |
1335 | goto error; | |
1336 | } | |
1337 | } | |
1338 | } else if (revents > 0) { | |
1339 | lttng_ht_lookup(relay_connections_ht, | |
1340 | (void *)((unsigned long) pollfd), | |
1341 | &iter); | |
1342 | node = lttng_ht_iter_get_node_ulong(&iter); | |
1343 | if (node == NULL) { | |
1344 | DBG2("Relay sock %d not found", pollfd); | |
1345 | goto error; | |
1346 | } | |
1347 | relay_connection = caa_container_of(node, | |
1348 | struct relay_command, sock_n); | |
1349 | ||
1350 | if (revents & (LPOLLERR)) { | |
1351 | ERR("POLL ERROR"); | |
1352 | relay_cleanup_connection(relay_connections_ht, | |
1353 | &events, streams_ht, pollfd, &iter); | |
1354 | free(relay_connection); | |
1355 | } else if (revents & (LPOLLHUP | LPOLLRDHUP)) { | |
1356 | DBG("Socket %d hung up", pollfd); | |
1357 | relay_cleanup_connection(relay_connections_ht, | |
1358 | &events, streams_ht, pollfd, &iter); | |
1359 | if (relay_connection->type == RELAY_CONTROL) { | |
1360 | relay_delete_session(relay_connection, streams_ht); | |
1361 | } | |
1362 | free(relay_connection); | |
1363 | } else if (revents & LPOLLIN) { | |
1364 | /* control socket */ | |
1365 | if (relay_connection->type == RELAY_CONTROL) { | |
1366 | ret = relay_connection->sock->ops->recvmsg( | |
1367 | relay_connection->sock, &recv_hdr, | |
1368 | sizeof(struct lttcomm_relayd_hdr), MSG_WAITALL); | |
1369 | /* connection closed */ | |
1370 | if (ret <= 0) { | |
1371 | relay_cleanup_connection(relay_connections_ht, | |
1372 | &events, streams_ht, pollfd, &iter); | |
1373 | relay_delete_session(relay_connection, streams_ht); | |
1374 | free(relay_connection); | |
1375 | DBG("Control connection closed with %d", pollfd); | |
1376 | } else { | |
1377 | if (relay_connection->session) { | |
1378 | DBG2("Relay worker receiving data for session : %lu", | |
1379 | relay_connection->session->id); | |
1380 | } | |
1381 | ret = relay_process_control(&recv_hdr, | |
1382 | relay_connection, | |
1383 | streams_ht); | |
1384 | /* | |
1385 | * there was an error in processing a control | |
1386 | * command: clear the session | |
1387 | * */ | |
1388 | if (ret < 0) { | |
1389 | relay_cleanup_connection(relay_connections_ht, | |
1390 | &events, streams_ht, pollfd, &iter); | |
1391 | free(relay_connection); | |
1392 | DBG("Connection closed with %d", pollfd); | |
1393 | } | |
1394 | } | |
1395 | /* data socket */ | |
1396 | } else if (relay_connection->type == RELAY_DATA) { | |
1397 | ret = relay_process_data(relay_connection, streams_ht); | |
1398 | /* connection closed */ | |
1399 | if (ret < 0) { | |
1400 | relay_cleanup_connection(relay_connections_ht, | |
1401 | &events, streams_ht, pollfd, &iter); | |
1402 | relay_delete_session(relay_connection, streams_ht); | |
1403 | DBG("Data connection closed with %d", pollfd); | |
1404 | } | |
1405 | } | |
1406 | } | |
1407 | } | |
1408 | } | |
1409 | } | |
1410 | ||
1411 | error: | |
1412 | lttng_poll_clean(&events); | |
1413 | ||
1414 | /* empty the hash table and free the memory */ | |
1415 | cds_lfht_for_each_entry(relay_connections_ht->ht, &iter.iter, node, node) { | |
1416 | node = lttng_ht_iter_get_node_ulong(&iter); | |
1417 | if (node) { | |
1418 | relay_connection = caa_container_of(node, | |
1419 | struct relay_command, sock_n); | |
1420 | free(relay_connection); | |
1421 | } | |
1422 | ret = lttng_ht_del(relay_connections_ht, &iter); | |
1423 | assert(!ret); | |
1424 | } | |
1425 | error_poll_create: | |
1426 | free(data_buffer); | |
1427 | lttng_ht_destroy(relay_connections_ht); | |
1428 | DBG("Worker thread cleanup complete"); | |
1429 | stop_threads(); | |
1430 | return NULL; | |
1431 | } | |
1432 | ||
1433 | /* | |
1434 | * Create the relay command pipe to wake thread_manage_apps. | |
1435 | * Closed in cleanup(). | |
1436 | */ | |
1437 | static int create_relay_cmd_pipe(void) | |
1438 | { | |
a02de639 | 1439 | int ret; |
b8aa1682 | 1440 | |
a02de639 | 1441 | ret = utils_create_pipe_cloexec(relay_cmd_pipe); |
b8aa1682 | 1442 | |
b8aa1682 JD |
1443 | return ret; |
1444 | } | |
1445 | ||
1446 | /* | |
1447 | * main | |
1448 | */ | |
1449 | int main(int argc, char **argv) | |
1450 | { | |
1451 | int ret = 0; | |
1452 | void *status; | |
1453 | ||
1454 | /* Create thread quit pipe */ | |
1455 | if ((ret = init_thread_quit_pipe()) < 0) { | |
1456 | goto error; | |
1457 | } | |
1458 | ||
1459 | /* Parse arguments */ | |
1460 | progname = argv[0]; | |
1461 | if ((ret = parse_args(argc, argv) < 0)) { | |
a02de639 | 1462 | goto exit; |
b8aa1682 JD |
1463 | } |
1464 | ||
1465 | if ((ret = set_signal_handler()) < 0) { | |
1466 | goto exit; | |
1467 | } | |
1468 | ||
1469 | /* Daemonize */ | |
1470 | if (opt_daemon) { | |
1471 | ret = daemon(0, 0); | |
1472 | if (ret < 0) { | |
1473 | PERROR("daemon"); | |
a02de639 | 1474 | goto exit; |
b8aa1682 JD |
1475 | } |
1476 | } | |
1477 | ||
1478 | /* Check if daemon is UID = 0 */ | |
1479 | is_root = !getuid(); | |
1480 | ||
1481 | if (!is_root) { | |
1482 | if (control_uri->port < 1024 || data_uri->port < 1024) { | |
1483 | ERR("Need to be root to use ports < 1024"); | |
1484 | ret = -1; | |
a02de639 | 1485 | goto exit; |
b8aa1682 JD |
1486 | } |
1487 | } | |
1488 | ||
1489 | /* Setup the thread apps communication pipe. */ | |
1490 | if ((ret = create_relay_cmd_pipe()) < 0) { | |
1491 | goto exit; | |
1492 | } | |
1493 | ||
1494 | /* Init relay command queue. */ | |
1495 | cds_wfq_init(&relay_cmd_queue.queue); | |
1496 | ||
1497 | /* Set up max poll set size */ | |
1498 | lttng_poll_set_max_size(); | |
1499 | ||
1500 | /* Setup the dispatcher thread */ | |
1501 | ret = pthread_create(&dispatcher_thread, NULL, | |
1502 | relay_thread_dispatcher, (void *) NULL); | |
1503 | if (ret != 0) { | |
1504 | PERROR("pthread_create dispatcher"); | |
1505 | goto exit_dispatcher; | |
1506 | } | |
1507 | ||
1508 | /* Setup the worker thread */ | |
1509 | ret = pthread_create(&worker_thread, NULL, | |
1510 | relay_thread_worker, (void *) NULL); | |
1511 | if (ret != 0) { | |
1512 | PERROR("pthread_create worker"); | |
1513 | goto exit_worker; | |
1514 | } | |
1515 | ||
1516 | /* Setup the listener thread */ | |
1517 | ret = pthread_create(&listener_thread, NULL, | |
1518 | relay_thread_listener, (void *) NULL); | |
1519 | if (ret != 0) { | |
1520 | PERROR("pthread_create listener"); | |
1521 | goto exit_listener; | |
1522 | } | |
1523 | ||
1524 | exit_listener: | |
1525 | ret = pthread_join(listener_thread, &status); | |
1526 | if (ret != 0) { | |
1527 | PERROR("pthread_join"); | |
1528 | goto error; /* join error, exit without cleanup */ | |
1529 | } | |
1530 | ||
1531 | exit_worker: | |
1532 | ret = pthread_join(worker_thread, &status); | |
1533 | if (ret != 0) { | |
1534 | PERROR("pthread_join"); | |
1535 | goto error; /* join error, exit without cleanup */ | |
1536 | } | |
1537 | ||
1538 | exit_dispatcher: | |
1539 | ret = pthread_join(dispatcher_thread, &status); | |
1540 | if (ret != 0) { | |
1541 | PERROR("pthread_join"); | |
1542 | goto error; /* join error, exit without cleanup */ | |
1543 | } | |
1544 | ||
1545 | exit: | |
1546 | cleanup(); | |
1547 | if (!ret) { | |
1548 | exit(EXIT_SUCCESS); | |
1549 | } | |
a02de639 | 1550 | |
b8aa1682 JD |
1551 | error: |
1552 | exit(EXIT_FAILURE); | |
1553 | } |