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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> | |
52 | ||
53 | #include "lttng-relayd.h" | |
54 | ||
55 | /* command line options */ | |
56 | static int opt_daemon; | |
57 | static char *opt_output_path; | |
58 | static struct lttng_uri *control_uri = NULL; | |
59 | static struct lttng_uri *data_uri = NULL; | |
60 | ||
61 | const char *progname; | |
62 | static int is_root; /* Set to 1 if the daemon is running as root */ | |
63 | ||
64 | /* | |
65 | * Quit pipe for all threads. This permits a single cancellation point | |
66 | * for all threads when receiving an event on the pipe. | |
67 | */ | |
68 | static int thread_quit_pipe[2] = { -1, -1 }; | |
69 | ||
70 | /* | |
71 | * This pipe is used to inform the worker thread that a command is queued and | |
72 | * ready to be processed. | |
73 | */ | |
74 | static int relay_cmd_pipe[2] = { -1, -1 }; | |
75 | ||
76 | static int dispatch_thread_exit; | |
77 | ||
78 | static pthread_t listener_thread; | |
79 | static pthread_t dispatcher_thread; | |
80 | static pthread_t worker_thread; | |
81 | ||
82 | static uint64_t last_relay_stream_id = 0; | |
83 | static uint64_t last_relay_session_id = 0; | |
84 | ||
85 | /* | |
86 | * Relay command queue. | |
87 | * | |
88 | * The relay_thread_listener and relay_thread_dispatcher communicate with this | |
89 | * queue. | |
90 | */ | |
91 | static struct relay_cmd_queue relay_cmd_queue; | |
92 | ||
93 | /* buffer allocated at startup, used to store the trace data */ | |
94 | static char *data_buffer = NULL; | |
95 | static unsigned int data_buffer_size = 0; | |
96 | ||
97 | /* | |
98 | * usage function on stderr | |
99 | */ | |
100 | static | |
101 | void usage(void) | |
102 | { | |
103 | fprintf(stderr, "Usage: %s OPTIONS\n\nOptions:\n", progname); | |
104 | fprintf(stderr, " -h, --help Display this usage.\n"); | |
105 | fprintf(stderr, " -d, --daemonize Start as a daemon.\n"); | |
106 | fprintf(stderr, " -C, --control-port Control port listening (URI)\n"); | |
107 | fprintf(stderr, " -D, --data-port Data port listening (URI)\n"); | |
25672d02 | 108 | fprintf(stderr, " -o, --output Output path for traces (PATH)\n"); |
b8aa1682 JD |
109 | fprintf(stderr, " -v, --verbose Verbose mode. Activate DBG() macro.\n"); |
110 | } | |
111 | ||
112 | static | |
113 | int parse_args(int argc, char **argv) | |
114 | { | |
115 | int c; | |
116 | int ret = 0; | |
117 | char *default_address; | |
118 | ||
119 | static struct option long_options[] = { | |
120 | { "control-port", 1, 0, 'C' }, | |
121 | { "data-port", 1, 0, 'D' }, | |
122 | { "daemonize", 0, 0, 'd' }, | |
25672d02 | 123 | { "help", 0, 0, 'h' }, |
b8aa1682 JD |
124 | { "output", 1, 0, 'o' }, |
125 | { "verbose", 0, 0, 'v' }, | |
126 | { NULL, 0, 0, 0 } | |
127 | }; | |
128 | ||
129 | while (1) { | |
130 | int option_index = 0; | |
131 | c = getopt_long(argc, argv, "dhv" "C:D:o:", | |
132 | long_options, &option_index); | |
133 | if (c == -1) { | |
134 | break; | |
135 | } | |
136 | ||
137 | switch (c) { | |
138 | case 0: | |
139 | fprintf(stderr, "option %s", long_options[option_index].name); | |
140 | if (optarg) { | |
141 | fprintf(stderr, " with arg %s\n", optarg); | |
142 | } | |
143 | break; | |
144 | case 'C': | |
145 | ret = uri_parse(optarg, &control_uri); | |
146 | if (ret < 0) { | |
147 | ERR("Invalid control URI specified"); | |
148 | goto exit; | |
149 | } | |
150 | if (control_uri->port == 0) { | |
151 | control_uri->port = DEFAULT_NETWORK_CONTROL_PORT; | |
152 | } | |
153 | break; | |
154 | case 'D': | |
155 | ret = uri_parse(optarg, &data_uri); | |
156 | if (ret < 0) { | |
157 | ERR("Invalid data URI specified"); | |
158 | goto exit; | |
159 | } | |
160 | if (data_uri->port == 0) { | |
161 | data_uri->port = DEFAULT_NETWORK_DATA_PORT; | |
162 | } | |
163 | break; | |
164 | case 'd': | |
165 | opt_daemon = 1; | |
166 | break; | |
167 | case 'h': | |
168 | usage(); | |
169 | exit(EXIT_FAILURE); | |
170 | case 'o': | |
171 | ret = asprintf(&opt_output_path, "%s", optarg); | |
172 | if (ret < 0) { | |
173 | PERROR("asprintf opt_output_path"); | |
174 | goto exit; | |
175 | } | |
176 | break; | |
177 | case 'v': | |
178 | /* Verbose level can increase using multiple -v */ | |
179 | lttng_opt_verbose += 1; | |
180 | break; | |
181 | default: | |
182 | /* Unknown option or other error. | |
183 | * Error is printed by getopt, just return */ | |
184 | ret = -1; | |
185 | goto exit; | |
186 | } | |
187 | } | |
188 | ||
189 | /* assign default values */ | |
190 | if (control_uri == NULL) { | |
191 | ret = asprintf(&default_address, "tcp://0.0.0.0:%d", | |
192 | DEFAULT_NETWORK_CONTROL_PORT); | |
193 | if (ret < 0) { | |
194 | PERROR("asprintf default data address"); | |
195 | goto exit; | |
196 | } | |
197 | ||
198 | ret = uri_parse(default_address, &control_uri); | |
199 | free(default_address); | |
200 | if (ret < 0) { | |
201 | ERR("Invalid control URI specified"); | |
202 | goto exit; | |
203 | } | |
204 | } | |
205 | if (data_uri == NULL) { | |
206 | ret = asprintf(&default_address, "tcp://0.0.0.0:%d", | |
207 | DEFAULT_NETWORK_DATA_PORT); | |
208 | if (ret < 0) { | |
209 | PERROR("asprintf default data address"); | |
210 | goto exit; | |
211 | } | |
212 | ||
213 | ret = uri_parse(default_address, &data_uri); | |
214 | free(default_address); | |
215 | if (ret < 0) { | |
216 | ERR("Invalid data URI specified"); | |
217 | goto exit; | |
218 | } | |
219 | } | |
220 | ||
221 | exit: | |
222 | return ret; | |
223 | } | |
224 | ||
225 | /* | |
226 | * Cleanup the daemon | |
227 | */ | |
228 | static | |
229 | void cleanup(void) | |
230 | { | |
231 | int i, ret; | |
232 | ||
233 | DBG("Cleaning up"); | |
234 | ||
235 | for (i = 0; i < 2; i++) { | |
236 | if (thread_quit_pipe[i] >= 0) { | |
237 | ret = close(thread_quit_pipe[i]); | |
238 | if (ret) { | |
239 | PERROR("close"); | |
240 | } | |
241 | } | |
242 | } | |
243 | } | |
244 | ||
245 | /* | |
246 | * Write to writable pipe used to notify a thread. | |
247 | */ | |
248 | static | |
249 | int notify_thread_pipe(int wpipe) | |
250 | { | |
251 | int ret; | |
252 | ||
253 | ret = write(wpipe, "!", 1); | |
254 | if (ret < 0) { | |
255 | PERROR("write poll pipe"); | |
256 | } | |
257 | ||
258 | return ret; | |
259 | } | |
260 | ||
261 | /* | |
262 | * Stop all threads by closing the thread quit pipe. | |
263 | */ | |
264 | static | |
265 | void stop_threads(void) | |
266 | { | |
267 | int ret; | |
268 | ||
269 | /* Stopping all threads */ | |
270 | DBG("Terminating all threads"); | |
271 | ret = notify_thread_pipe(thread_quit_pipe[1]); | |
272 | if (ret < 0) { | |
273 | ERR("write error on thread quit pipe"); | |
274 | } | |
275 | ||
276 | /* Dispatch thread */ | |
277 | dispatch_thread_exit = 1; | |
278 | futex_nto1_wake(&relay_cmd_queue.futex); | |
279 | } | |
280 | ||
281 | /* | |
282 | * Signal handler for the daemon | |
283 | * | |
284 | * Simply stop all worker threads, leaving main() return gracefully after | |
285 | * joining all threads and calling cleanup(). | |
286 | */ | |
287 | static | |
288 | void sighandler(int sig) | |
289 | { | |
290 | switch (sig) { | |
291 | case SIGPIPE: | |
292 | DBG("SIGPIPE caught"); | |
293 | return; | |
294 | case SIGINT: | |
295 | DBG("SIGINT caught"); | |
296 | stop_threads(); | |
297 | break; | |
298 | case SIGTERM: | |
299 | DBG("SIGTERM caught"); | |
300 | stop_threads(); | |
301 | break; | |
302 | default: | |
303 | break; | |
304 | } | |
305 | } | |
306 | ||
307 | /* | |
308 | * Setup signal handler for : | |
309 | * SIGINT, SIGTERM, SIGPIPE | |
310 | */ | |
311 | static | |
312 | int set_signal_handler(void) | |
313 | { | |
314 | int ret = 0; | |
315 | struct sigaction sa; | |
316 | sigset_t sigset; | |
317 | ||
318 | if ((ret = sigemptyset(&sigset)) < 0) { | |
319 | PERROR("sigemptyset"); | |
320 | return ret; | |
321 | } | |
322 | ||
323 | sa.sa_handler = sighandler; | |
324 | sa.sa_mask = sigset; | |
325 | sa.sa_flags = 0; | |
326 | if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) { | |
327 | PERROR("sigaction"); | |
328 | return ret; | |
329 | } | |
330 | ||
331 | if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) { | |
332 | PERROR("sigaction"); | |
333 | return ret; | |
334 | } | |
335 | ||
336 | if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) { | |
337 | PERROR("sigaction"); | |
338 | return ret; | |
339 | } | |
340 | ||
341 | DBG("Signal handler set for SIGTERM, SIGPIPE and SIGINT"); | |
342 | ||
343 | return ret; | |
344 | } | |
345 | ||
346 | /* | |
347 | * Init thread quit pipe. | |
348 | * | |
349 | * Return -1 on error or 0 if all pipes are created. | |
350 | */ | |
351 | static | |
352 | int init_thread_quit_pipe(void) | |
353 | { | |
354 | int ret, i; | |
355 | ||
356 | ret = pipe(thread_quit_pipe); | |
357 | if (ret < 0) { | |
358 | PERROR("thread quit pipe"); | |
359 | goto error; | |
360 | } | |
361 | ||
362 | for (i = 0; i < 2; i++) { | |
363 | ret = fcntl(thread_quit_pipe[i], F_SETFD, FD_CLOEXEC); | |
364 | if (ret < 0) { | |
365 | PERROR("fcntl"); | |
366 | goto error; | |
367 | } | |
368 | } | |
369 | ||
370 | error: | |
371 | return ret; | |
372 | } | |
373 | ||
374 | /* | |
375 | * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set. | |
376 | */ | |
377 | static | |
378 | int create_thread_poll_set(struct lttng_poll_event *events, int size) | |
379 | { | |
380 | int ret; | |
381 | ||
382 | if (events == NULL || size == 0) { | |
383 | ret = -1; | |
384 | goto error; | |
385 | } | |
386 | ||
387 | ret = lttng_poll_create(events, size, LTTNG_CLOEXEC); | |
388 | if (ret < 0) { | |
389 | goto error; | |
390 | } | |
391 | ||
392 | /* Add quit pipe */ | |
393 | ret = lttng_poll_add(events, thread_quit_pipe[0], LPOLLIN); | |
394 | if (ret < 0) { | |
395 | goto error; | |
396 | } | |
397 | ||
398 | return 0; | |
399 | ||
400 | error: | |
401 | return ret; | |
402 | } | |
403 | ||
404 | /* | |
405 | * Check if the thread quit pipe was triggered. | |
406 | * | |
407 | * Return 1 if it was triggered else 0; | |
408 | */ | |
409 | static | |
410 | int check_thread_quit_pipe(int fd, uint32_t events) | |
411 | { | |
412 | if (fd == thread_quit_pipe[0] && (events & LPOLLIN)) { | |
413 | return 1; | |
414 | } | |
415 | ||
416 | return 0; | |
417 | } | |
418 | ||
419 | /* | |
420 | * Create and init socket from uri. | |
421 | */ | |
422 | static | |
423 | struct lttcomm_sock *relay_init_sock(struct lttng_uri *uri) | |
424 | { | |
425 | int ret; | |
426 | struct lttcomm_sock *sock = NULL; | |
427 | ||
428 | sock = lttcomm_alloc_sock_from_uri(uri); | |
429 | if (sock == NULL) { | |
430 | ERR("Allocating socket"); | |
431 | goto error; | |
432 | } | |
433 | ||
434 | ret = lttcomm_create_sock(sock); | |
435 | if (ret < 0) { | |
436 | goto error; | |
437 | } | |
438 | DBG("Listening on sock %d", sock->fd); | |
439 | ||
440 | ret = sock->ops->bind(sock); | |
441 | if (ret < 0) { | |
442 | goto error; | |
443 | } | |
444 | ||
445 | ret = sock->ops->listen(sock, -1); | |
446 | if (ret < 0) { | |
447 | goto error; | |
448 | ||
449 | } | |
450 | ||
451 | return sock; | |
452 | ||
453 | error: | |
454 | if (sock) { | |
455 | lttcomm_destroy_sock(sock); | |
456 | } | |
457 | return NULL; | |
458 | } | |
459 | ||
460 | /* | |
461 | * This thread manages the listening for new connections on the network | |
462 | */ | |
463 | static | |
464 | void *relay_thread_listener(void *data) | |
465 | { | |
466 | int i, ret, pollfd; | |
467 | int val = 1; | |
468 | uint32_t revents, nb_fd; | |
469 | struct lttng_poll_event events; | |
470 | struct lttcomm_sock *control_sock, *data_sock; | |
471 | ||
472 | /* | |
473 | * Get allocated in this thread, enqueued to a global queue, dequeued and | |
474 | * freed in the worker thread. | |
475 | */ | |
476 | struct relay_command *relay_cmd = NULL; | |
477 | ||
478 | DBG("[thread] Relay listener started"); | |
479 | ||
480 | control_sock = relay_init_sock(control_uri); | |
481 | if (!control_sock) { | |
482 | goto error_sock; | |
483 | } | |
484 | ||
485 | data_sock = relay_init_sock(data_uri); | |
486 | if (!data_sock) { | |
487 | goto error_sock; | |
488 | } | |
489 | ||
490 | /* | |
491 | * Pass 3 as size here for the thread quit pipe, control and data socket. | |
492 | */ | |
493 | ret = create_thread_poll_set(&events, 3); | |
494 | if (ret < 0) { | |
495 | goto error_create_poll; | |
496 | } | |
497 | ||
498 | /* Add the control socket */ | |
499 | ret = lttng_poll_add(&events, control_sock->fd, LPOLLIN | LPOLLRDHUP); | |
500 | if (ret < 0) { | |
501 | goto error_poll_add; | |
502 | } | |
503 | ||
504 | /* Add the data socket */ | |
505 | ret = lttng_poll_add(&events, data_sock->fd, LPOLLIN | LPOLLRDHUP); | |
506 | if (ret < 0) { | |
507 | goto error_poll_add; | |
508 | } | |
509 | ||
510 | while (1) { | |
511 | DBG("Listener accepting connections"); | |
512 | ||
513 | nb_fd = LTTNG_POLL_GETNB(&events); | |
514 | ||
515 | restart: | |
516 | ret = lttng_poll_wait(&events, -1); | |
517 | if (ret < 0) { | |
518 | /* | |
519 | * Restart interrupted system call. | |
520 | */ | |
521 | if (errno == EINTR) { | |
522 | goto restart; | |
523 | } | |
524 | goto error; | |
525 | } | |
526 | ||
527 | DBG("Relay new connection received"); | |
528 | for (i = 0; i < nb_fd; i++) { | |
529 | /* Fetch once the poll data */ | |
530 | revents = LTTNG_POLL_GETEV(&events, i); | |
531 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
532 | ||
533 | /* Thread quit pipe has been closed. Killing thread. */ | |
534 | ret = check_thread_quit_pipe(pollfd, revents); | |
535 | if (ret) { | |
536 | goto error; | |
537 | } | |
538 | ||
539 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
540 | ERR("socket poll error"); | |
541 | goto error; | |
542 | } else if (revents & LPOLLIN) { | |
543 | struct lttcomm_sock *newsock = NULL; | |
544 | ||
545 | relay_cmd = zmalloc(sizeof(struct relay_command)); | |
546 | if (relay_cmd == NULL) { | |
547 | PERROR("relay command zmalloc"); | |
548 | goto error; | |
549 | } | |
550 | ||
551 | if (pollfd == data_sock->fd) { | |
552 | newsock = data_sock->ops->accept(data_sock); | |
553 | if (newsock < 0) { | |
554 | PERROR("accepting data sock"); | |
555 | goto error; | |
556 | } | |
557 | relay_cmd->type = RELAY_DATA; | |
558 | DBG("Relay data connection accepted, socket %d", newsock->fd); | |
559 | } else if (pollfd == control_sock->fd) { | |
560 | newsock = control_sock->ops->accept(control_sock); | |
561 | if (newsock < 0) { | |
562 | PERROR("accepting control sock"); | |
563 | goto error; | |
564 | } | |
565 | relay_cmd->type = RELAY_CONTROL; | |
566 | DBG("Relay control connection accepted, socket %d", newsock->fd); | |
567 | } | |
568 | ret = setsockopt(newsock->fd, SOL_SOCKET, SO_REUSEADDR, | |
569 | &val, sizeof(int)); | |
570 | if (ret < 0) { | |
571 | PERROR("setsockopt inet"); | |
572 | goto error; | |
573 | } | |
574 | relay_cmd->sock = newsock; | |
575 | /* | |
576 | * Lock free enqueue the request. | |
577 | */ | |
578 | cds_wfq_enqueue(&relay_cmd_queue.queue, &relay_cmd->node); | |
579 | ||
580 | /* | |
581 | * Wake the dispatch queue futex. Implicit memory | |
582 | * barrier with the exchange in cds_wfq_enqueue. | |
583 | */ | |
584 | futex_nto1_wake(&relay_cmd_queue.futex); | |
585 | } | |
586 | } | |
587 | } | |
588 | ||
589 | error: | |
590 | error_poll_add: | |
591 | lttng_poll_clean(&events); | |
592 | error_create_poll: | |
593 | if (control_sock->fd >= 0) { | |
594 | ret = control_sock->ops->close(control_sock); | |
595 | if (ret) { | |
596 | PERROR("close"); | |
597 | } | |
598 | lttcomm_destroy_sock(control_sock); | |
599 | } | |
600 | if (data_sock->fd >= 0) { | |
601 | ret = data_sock->ops->close(data_sock); | |
602 | if (ret) { | |
603 | PERROR("close"); | |
604 | } | |
605 | lttcomm_destroy_sock(data_sock); | |
606 | } | |
607 | ||
608 | DBG("Relay listener thread cleanup complete"); | |
609 | stop_threads(); | |
610 | error_sock: | |
611 | return NULL; | |
612 | } | |
613 | ||
614 | /* | |
615 | * This thread manages the dispatching of the requests to worker threads | |
616 | */ | |
617 | static | |
618 | void *relay_thread_dispatcher(void *data) | |
619 | { | |
620 | int ret; | |
621 | struct cds_wfq_node *node; | |
622 | struct relay_command *relay_cmd = NULL; | |
623 | ||
624 | DBG("[thread] Relay dispatcher started"); | |
625 | ||
626 | while (!dispatch_thread_exit) { | |
627 | /* Atomically prepare the queue futex */ | |
628 | futex_nto1_prepare(&relay_cmd_queue.futex); | |
629 | ||
630 | do { | |
631 | /* Dequeue commands */ | |
632 | node = cds_wfq_dequeue_blocking(&relay_cmd_queue.queue); | |
633 | if (node == NULL) { | |
634 | DBG("Woken up but nothing in the relay command queue"); | |
635 | /* Continue thread execution */ | |
636 | break; | |
637 | } | |
638 | ||
639 | relay_cmd = caa_container_of(node, struct relay_command, node); | |
640 | DBG("Dispatching request waiting on sock %d", relay_cmd->sock->fd); | |
641 | ||
642 | /* | |
643 | * Inform worker thread of the new request. This | |
644 | * call is blocking so we can be assured that the data will be read | |
645 | * at some point in time or wait to the end of the world :) | |
646 | */ | |
647 | ret = write(relay_cmd_pipe[1], relay_cmd, | |
648 | sizeof(struct relay_command)); | |
649 | free(relay_cmd); | |
650 | if (ret < 0) { | |
651 | PERROR("write cmd pipe"); | |
652 | goto error; | |
653 | } | |
654 | } while (node != NULL); | |
655 | ||
656 | /* Futex wait on queue. Blocking call on futex() */ | |
657 | futex_nto1_wait(&relay_cmd_queue.futex); | |
658 | } | |
659 | ||
660 | error: | |
661 | DBG("Dispatch thread dying"); | |
662 | stop_threads(); | |
663 | return NULL; | |
664 | } | |
665 | ||
666 | /* | |
667 | * Return the realpath(3) of the path even if the last directory token does not | |
668 | * exist. For example, with /tmp/test1/test2, if test2/ does not exist but the | |
669 | * /tmp/test1 does, the real path is returned. In normal time, realpath(3) | |
670 | * fails if the end point directory does not exist. | |
671 | */ | |
672 | static | |
673 | char *expand_full_path(const char *path) | |
674 | { | |
675 | const char *end_path = path; | |
676 | char *next, *cut_path, *expanded_path; | |
677 | ||
678 | /* Find last token delimited by '/' */ | |
679 | while ((next = strpbrk(end_path + 1, "/"))) { | |
680 | end_path = next; | |
681 | } | |
682 | ||
683 | /* Cut last token from original path */ | |
684 | cut_path = strndup(path, end_path - path); | |
685 | ||
686 | expanded_path = malloc(PATH_MAX); | |
687 | if (expanded_path == NULL) { | |
688 | goto error; | |
689 | } | |
690 | ||
691 | expanded_path = realpath((char *)cut_path, expanded_path); | |
692 | if (expanded_path == NULL) { | |
693 | switch (errno) { | |
694 | case ENOENT: | |
695 | ERR("%s: No such file or directory", cut_path); | |
696 | break; | |
697 | default: | |
698 | PERROR("realpath"); | |
699 | break; | |
700 | } | |
701 | goto error; | |
702 | } | |
703 | ||
704 | /* Add end part to expanded path */ | |
705 | strcat(expanded_path, end_path); | |
706 | ||
707 | free(cut_path); | |
708 | return expanded_path; | |
709 | ||
710 | error: | |
711 | free(cut_path); | |
712 | return NULL; | |
713 | } | |
714 | ||
715 | ||
716 | /* | |
717 | * config_get_default_path | |
718 | * | |
719 | * Returns the HOME directory path. Caller MUST NOT free(3) the return pointer. | |
720 | */ | |
721 | static | |
722 | char *config_get_default_path(void) | |
723 | { | |
724 | return getenv("HOME"); | |
725 | } | |
726 | ||
727 | /* | |
728 | * Create recursively directory using the FULL path. | |
729 | */ | |
730 | static | |
731 | int mkdir_recursive(char *path, mode_t mode) | |
732 | { | |
733 | char *p, tmp[PATH_MAX]; | |
734 | struct stat statbuf; | |
735 | size_t len; | |
736 | int ret; | |
737 | ||
738 | ret = snprintf(tmp, sizeof(tmp), "%s", path); | |
739 | if (ret < 0) { | |
740 | PERROR("snprintf mkdir"); | |
741 | goto error; | |
742 | } | |
743 | ||
744 | len = ret; | |
745 | if (tmp[len - 1] == '/') { | |
746 | tmp[len - 1] = 0; | |
747 | } | |
748 | ||
749 | for (p = tmp + 1; *p; p++) { | |
750 | if (*p == '/') { | |
751 | *p = 0; | |
752 | if (tmp[strlen(tmp) - 1] == '.' && | |
753 | tmp[strlen(tmp) - 2] == '.' && | |
754 | tmp[strlen(tmp) - 3] == '/') { | |
755 | ERR("Using '/../' is not permitted in the trace path (%s)", | |
756 | tmp); | |
757 | ret = -1; | |
758 | goto error; | |
759 | } | |
760 | ret = stat(tmp, &statbuf); | |
761 | if (ret < 0) { | |
762 | ret = mkdir(tmp, mode); | |
763 | if (ret < 0) { | |
764 | if (!(errno == EEXIST)) { | |
765 | PERROR("mkdir recursive"); | |
766 | ret = -errno; | |
767 | goto error; | |
768 | } | |
769 | } | |
770 | } | |
771 | *p = '/'; | |
772 | } | |
773 | } | |
774 | ||
775 | ret = mkdir(tmp, mode); | |
776 | if (ret < 0) { | |
777 | if (!(errno == EEXIST)) { | |
778 | PERROR("mkdir recursive last piece"); | |
779 | ret = -errno; | |
780 | } else { | |
781 | ret = 0; | |
782 | } | |
783 | } | |
784 | ||
785 | error: | |
786 | return ret; | |
787 | } | |
788 | ||
789 | /* | |
790 | * create_output_path: create the output trace directory | |
791 | */ | |
792 | static | |
793 | char *create_output_path(char *path_name) | |
794 | { | |
795 | int ret = 0; | |
796 | char *alloc_path = NULL; | |
797 | char *traces_path = NULL; | |
798 | char *full_path = NULL; | |
799 | ||
800 | /* Auto output path */ | |
801 | if (opt_output_path == NULL) { | |
802 | alloc_path = strdup(config_get_default_path()); | |
803 | if (alloc_path == NULL) { | |
804 | ERR("Home path not found.\n \ | |
805 | Please specify an output path using -o, --output PATH"); | |
806 | ret = -1; | |
807 | goto exit; | |
808 | } | |
809 | ||
810 | ret = asprintf(&traces_path, "%s/" DEFAULT_TRACE_DIR_NAME | |
811 | "/%s", alloc_path, path_name); | |
812 | if (ret < 0) { | |
813 | PERROR("asprintf trace dir name"); | |
814 | goto exit; | |
815 | } | |
816 | } else { | |
817 | full_path = expand_full_path(opt_output_path); | |
818 | ret = asprintf(&traces_path, "%s/%s", full_path, path_name); | |
819 | if (ret < 0) { | |
820 | PERROR("asprintf trace dir name"); | |
821 | goto exit; | |
822 | } | |
823 | } | |
824 | free(alloc_path); | |
825 | free(full_path); | |
826 | ||
827 | exit: | |
828 | return traces_path; | |
829 | } | |
830 | ||
831 | /* | |
832 | * relay_delete_session: Free all memory associated with a session and | |
833 | * close all the FDs | |
834 | */ | |
835 | static | |
836 | void relay_delete_session(struct relay_command *cmd, struct lttng_ht *streams_ht) | |
837 | { | |
838 | struct lttng_ht_iter iter; | |
839 | struct lttng_ht_node_ulong *node; | |
840 | struct relay_stream *stream; | |
841 | int ret; | |
842 | ||
843 | if (!cmd->session) | |
844 | return; | |
845 | ||
846 | DBG("Relay deleting session %lu", cmd->session->id); | |
847 | free(cmd->session->sock); | |
848 | ||
849 | cds_lfht_for_each_entry(streams_ht->ht, &iter.iter, node, node) { | |
850 | node = lttng_ht_iter_get_node_ulong(&iter); | |
851 | if (node) { | |
852 | stream = caa_container_of(node, | |
853 | struct relay_stream, stream_n); | |
854 | if (stream->session == cmd->session) { | |
855 | close(stream->fd); | |
856 | ret = lttng_ht_del(streams_ht, &iter); | |
857 | assert(!ret); | |
858 | free(stream); | |
859 | } | |
860 | } | |
861 | } | |
862 | } | |
863 | ||
864 | /* | |
865 | * relay_add_stream: allocate a new stream for a session | |
866 | */ | |
867 | static | |
868 | int relay_add_stream(struct lttcomm_relayd_hdr *recv_hdr, | |
869 | struct relay_command *cmd, struct lttng_ht *streams_ht) | |
870 | { | |
871 | struct relay_session *session = cmd->session; | |
872 | struct lttcomm_relayd_add_stream stream_info; | |
873 | struct relay_stream *stream = NULL; | |
874 | struct lttcomm_relayd_status_stream reply; | |
875 | char *path = NULL, *root_path = NULL; | |
876 | int ret, send_ret; | |
877 | ||
878 | if (!session || session->version_check_done == 0) { | |
879 | ERR("Trying to add a stream before version check"); | |
880 | ret = -1; | |
881 | goto end_no_session; | |
882 | } | |
883 | ||
884 | /* FIXME : use data_size for something ? */ | |
885 | ret = cmd->sock->ops->recvmsg(cmd->sock, &stream_info, | |
886 | sizeof(struct lttcomm_relayd_add_stream), MSG_WAITALL); | |
887 | if (ret < sizeof(struct lttcomm_relayd_add_stream)) { | |
888 | ERR("Relay didn't receive valid add_stream struct size : %d", ret); | |
889 | ret = -1; | |
890 | goto end_no_session; | |
891 | } | |
892 | stream = zmalloc(sizeof(struct relay_stream)); | |
893 | if (stream == NULL) { | |
894 | PERROR("relay stream zmalloc"); | |
895 | ret = -1; | |
896 | goto end_no_session; | |
897 | } | |
898 | ||
899 | stream->stream_handle = ++last_relay_stream_id; | |
900 | stream->seq = 0; | |
901 | stream->session = session; | |
902 | ||
903 | root_path = create_output_path(stream_info.pathname); | |
904 | if (!root_path) { | |
905 | ret = -1; | |
906 | goto end; | |
907 | } | |
908 | ret = mkdir_recursive(root_path, S_IRWXU | S_IRWXG); | |
909 | if (ret < 0) { | |
910 | free(root_path); | |
911 | ERR("relay creating output directory"); | |
912 | goto end; | |
913 | } | |
914 | ||
915 | ret = asprintf(&path, "%s/%s", root_path, stream_info.channel_name); | |
916 | if (ret < 0) { | |
917 | PERROR("asprintf stream path"); | |
918 | goto end; | |
919 | } | |
920 | ||
921 | ret = open(path, O_WRONLY|O_CREAT|O_TRUNC, S_IRWXU|S_IRWXG|S_IRWXO); | |
922 | if (ret < 0) { | |
923 | PERROR("Relay creating trace file"); | |
924 | goto end; | |
925 | } | |
926 | ||
927 | stream->fd = ret; | |
928 | DBG("Tracefile %s created", path); | |
929 | ||
930 | lttng_ht_node_init_ulong(&stream->stream_n, | |
931 | (unsigned long) stream->stream_handle); | |
932 | lttng_ht_add_unique_ulong(streams_ht, | |
933 | &stream->stream_n); | |
934 | ||
935 | DBG("Relay new stream added %s", stream_info.channel_name); | |
936 | ||
937 | end: | |
938 | free(path); | |
939 | free(root_path); | |
940 | /* send the session id to the client or a negative return code on error */ | |
941 | if (ret < 0) { | |
942 | reply.ret_code = htobe32(LTTCOMM_ERR); | |
943 | } else { | |
944 | reply.ret_code = htobe32(LTTCOMM_OK); | |
945 | } | |
946 | reply.handle = htobe64(stream->stream_handle); | |
947 | send_ret = cmd->sock->ops->sendmsg(cmd->sock, &reply, | |
948 | sizeof(struct lttcomm_relayd_status_stream), 0); | |
949 | if (send_ret < 0) { | |
950 | ERR("Relay sending stream id"); | |
951 | } | |
952 | ||
953 | end_no_session: | |
954 | return ret; | |
955 | } | |
956 | ||
957 | /* | |
958 | * relay_unknown_command: send -1 if received unknown command | |
959 | */ | |
960 | static | |
961 | void relay_unknown_command(struct relay_command *cmd) | |
962 | { | |
963 | struct lttcomm_relayd_generic_reply reply; | |
964 | int ret; | |
965 | ||
966 | reply.ret_code = htobe32(LTTCOMM_ERR); | |
967 | ret = cmd->sock->ops->sendmsg(cmd->sock, &reply, | |
968 | sizeof(struct lttcomm_relayd_generic_reply), 0); | |
969 | if (ret < 0) { | |
970 | ERR("Relay sending unknown command"); | |
971 | } | |
972 | } | |
973 | ||
974 | /* | |
975 | * relay_start: send an acknowledgment to the client to tell if we are | |
976 | * ready to receive data. We are ready if a session is established. | |
977 | */ | |
978 | static | |
979 | int relay_start(struct lttcomm_relayd_hdr *recv_hdr, | |
980 | struct relay_command *cmd) | |
981 | { | |
982 | int ret = htobe32(LTTCOMM_OK); | |
983 | struct lttcomm_relayd_generic_reply reply; | |
984 | struct relay_session *session = cmd->session; | |
985 | ||
986 | if (!session) { | |
987 | DBG("Trying to start the streaming without a session established"); | |
988 | ret = htobe32(LTTCOMM_ERR); | |
989 | } | |
990 | ||
991 | reply.ret_code = ret; | |
992 | ret = cmd->sock->ops->sendmsg(cmd->sock, &reply, | |
993 | sizeof(struct lttcomm_relayd_generic_reply), 0); | |
994 | if (ret < 0) { | |
995 | ERR("Relay sending start ack"); | |
996 | } | |
997 | ||
998 | return ret; | |
999 | } | |
1000 | ||
1001 | /* | |
1002 | * Get stream from stream id. | |
1003 | */ | |
1004 | static | |
1005 | struct relay_stream *relay_stream_from_stream_id(uint64_t stream_id, | |
1006 | struct lttng_ht *streams_ht) | |
1007 | { | |
1008 | struct lttng_ht_node_ulong *node; | |
1009 | struct lttng_ht_iter iter; | |
1010 | struct relay_stream *ret; | |
1011 | ||
1012 | lttng_ht_lookup(streams_ht, | |
1013 | (void *)((unsigned long) stream_id), | |
1014 | &iter); | |
1015 | node = lttng_ht_iter_get_node_ulong(&iter); | |
1016 | if (node == NULL) { | |
1017 | DBG("Relay stream %lu not found", stream_id); | |
1018 | ret = NULL; | |
1019 | goto end; | |
1020 | } | |
1021 | ||
1022 | ret = caa_container_of(node, struct relay_stream, stream_n); | |
1023 | ||
1024 | end: | |
1025 | return ret; | |
1026 | } | |
1027 | ||
1028 | /* | |
1029 | * relay_recv_metadata: receive the metada for the session. | |
1030 | */ | |
1031 | static | |
1032 | int relay_recv_metadata(struct lttcomm_relayd_hdr *recv_hdr, | |
1033 | struct relay_command *cmd, struct lttng_ht *streams_ht) | |
1034 | { | |
1035 | int ret = htobe32(LTTCOMM_OK); | |
1036 | struct relay_session *session = cmd->session; | |
1037 | struct lttcomm_relayd_metadata_payload *metadata_struct; | |
1038 | struct relay_stream *metadata_stream; | |
1039 | uint64_t data_size, payload_size; | |
1040 | ||
1041 | if (!session) { | |
1042 | ERR("Metadata sent before version check"); | |
1043 | ret = -1; | |
1044 | goto end; | |
1045 | } | |
1046 | ||
1047 | data_size = be64toh(recv_hdr->data_size); | |
1048 | payload_size = data_size - sizeof(uint64_t); | |
1049 | if (data_buffer_size < data_size) { | |
1050 | data_buffer = realloc(data_buffer, data_size); | |
1051 | if (!data_buffer) { | |
1052 | ERR("Allocating data buffer"); | |
1053 | ret = -1; | |
1054 | goto end; | |
1055 | } | |
1056 | data_buffer_size = data_size; | |
1057 | } | |
1058 | memset(data_buffer, 0, data_size); | |
1059 | DBG2("Relay receiving metadata, waiting for %lu bytes", data_size); | |
1060 | ret = cmd->sock->ops->recvmsg(cmd->sock, data_buffer, data_size, MSG_WAITALL); | |
1061 | if (ret < 0 || ret != data_size) { | |
1062 | ret = -1; | |
1063 | ERR("Relay didn't receive the whole metadata"); | |
1064 | goto end; | |
1065 | } | |
1066 | metadata_struct = (struct lttcomm_relayd_metadata_payload *) data_buffer; | |
1067 | metadata_stream = relay_stream_from_stream_id( | |
1068 | be64toh(metadata_struct->stream_id), streams_ht); | |
1069 | if (!metadata_stream) { | |
1070 | ret = -1; | |
1071 | goto end; | |
1072 | } | |
1073 | ||
1074 | ret = write(metadata_stream->fd, metadata_struct->payload, | |
1075 | payload_size); | |
1076 | if (ret < (payload_size)) { | |
1077 | ERR("Relay error writing metadata on file"); | |
1078 | ret = -1; | |
1079 | goto end; | |
1080 | } | |
1081 | DBG2("Relay metadata written"); | |
1082 | ||
1083 | end: | |
1084 | return ret; | |
1085 | } | |
1086 | ||
1087 | /* | |
1088 | * relay_send_version: send relayd version number | |
1089 | */ | |
1090 | static | |
1091 | int relay_send_version(struct lttcomm_relayd_hdr *recv_hdr, | |
1092 | struct relay_command *cmd) | |
1093 | { | |
1094 | int ret = htobe32(LTTCOMM_OK); | |
1095 | struct lttcomm_relayd_version reply; | |
1096 | struct relay_session *session = NULL; | |
1097 | ||
1098 | if (cmd->session == NULL) { | |
1099 | session = zmalloc(sizeof(struct relay_session)); | |
1100 | if (session == NULL) { | |
1101 | PERROR("relay session zmalloc"); | |
1102 | ret = -1; | |
1103 | goto end; | |
1104 | } | |
1105 | session->id = ++last_relay_session_id; | |
1106 | DBG("Created session %lu", session->id); | |
1107 | cmd->session = session; | |
1108 | } | |
1109 | session->version_check_done = 1; | |
1110 | ||
1111 | sscanf(VERSION, "%u.%u", &reply.major, &reply.minor); | |
1112 | reply.major = htobe32(reply.major); | |
1113 | reply.minor = htobe32(reply.minor); | |
1114 | ret = cmd->sock->ops->sendmsg(cmd->sock, &reply, | |
1115 | sizeof(struct lttcomm_relayd_version), 0); | |
1116 | if (ret < 0) { | |
1117 | ERR("Relay sending version"); | |
1118 | } | |
1119 | DBG("Version check done"); | |
1120 | ||
1121 | end: | |
1122 | return ret; | |
1123 | } | |
1124 | ||
1125 | /* | |
1126 | * relay_process_control: Process the commands received on the control socket | |
1127 | */ | |
1128 | static | |
1129 | int relay_process_control(struct lttcomm_relayd_hdr *recv_hdr, | |
1130 | struct relay_command *cmd, struct lttng_ht *streams_ht) | |
1131 | { | |
1132 | int ret = 0; | |
1133 | ||
1134 | switch (be32toh(recv_hdr->cmd)) { | |
1135 | /* | |
1136 | case RELAYD_CREATE_SESSION: | |
1137 | ret = relay_create_session(recv_hdr, cmd); | |
1138 | break; | |
1139 | */ | |
1140 | case RELAYD_ADD_STREAM: | |
1141 | ret = relay_add_stream(recv_hdr, cmd, streams_ht); | |
1142 | break; | |
1143 | case RELAYD_START_DATA: | |
1144 | ret = relay_start(recv_hdr, cmd); | |
1145 | break; | |
1146 | case RELAYD_SEND_METADATA: | |
1147 | ret = relay_recv_metadata(recv_hdr, cmd, streams_ht); | |
1148 | break; | |
1149 | case RELAYD_VERSION: | |
1150 | ret = relay_send_version(recv_hdr, cmd); | |
1151 | break; | |
1152 | case RELAYD_UPDATE_SYNC_INFO: | |
1153 | default: | |
1154 | ERR("Received unknown command (%u)", be32toh(recv_hdr->cmd)); | |
1155 | relay_unknown_command(cmd); | |
1156 | ret = -1; | |
1157 | goto end; | |
1158 | } | |
1159 | ||
1160 | end: | |
1161 | return ret; | |
1162 | } | |
1163 | ||
1164 | /* | |
1165 | * relay_process_data: Process the data received on the data socket | |
1166 | */ | |
1167 | static | |
1168 | int relay_process_data(struct relay_command *cmd, struct lttng_ht *streams_ht) | |
1169 | { | |
1170 | int ret = 0; | |
1171 | struct relay_stream *stream; | |
1172 | struct lttcomm_relayd_data_hdr data_hdr; | |
1173 | uint64_t stream_id; | |
1174 | uint32_t data_size; | |
1175 | ||
1176 | ret = cmd->sock->ops->recvmsg(cmd->sock, &data_hdr, | |
1177 | sizeof(struct lttcomm_relayd_data_hdr), MSG_WAITALL); | |
1178 | if (ret <= 0) { | |
1179 | ERR("Connections seems to be closed"); | |
1180 | ret = -1; | |
1181 | goto end; | |
1182 | } | |
1183 | ||
1184 | stream_id = be64toh(data_hdr.stream_id); | |
1185 | stream = relay_stream_from_stream_id(stream_id, streams_ht); | |
1186 | if (!stream) { | |
1187 | ret = -1; | |
1188 | goto end; | |
1189 | } | |
1190 | ||
1191 | data_size = be32toh(data_hdr.data_size); | |
1192 | if (data_buffer_size < data_size) { | |
1193 | data_buffer = realloc(data_buffer, data_size); | |
1194 | if (!data_buffer) { | |
1195 | ERR("Allocating data buffer"); | |
1196 | ret = -1; | |
1197 | goto end; | |
1198 | } | |
1199 | data_buffer_size = data_size; | |
1200 | } | |
1201 | memset(data_buffer, 0, data_size); | |
1202 | ||
1203 | ret = cmd->sock->ops->recvmsg(cmd->sock, data_buffer, data_size, MSG_WAITALL); | |
1204 | if (ret <= 0) { | |
1205 | ret = -1; | |
1206 | goto end; | |
1207 | } | |
1208 | ||
1209 | ret = write(stream->fd, data_buffer, data_size); | |
1210 | if (ret < data_size) { | |
1211 | ERR("Relay error writing data to file"); | |
1212 | ret = -1; | |
1213 | goto end; | |
1214 | } | |
1215 | DBG2("Relay wrote %d bytes to tracefile for stream id %lu", ret, stream->stream_handle); | |
1216 | ||
1217 | end: | |
1218 | return ret; | |
1219 | } | |
1220 | ||
1221 | static | |
1222 | void relay_cleanup_connection(struct lttng_ht *relay_connections_ht, struct lttng_poll_event *events, | |
1223 | struct lttng_ht *streams_ht, int pollfd, struct lttng_ht_iter *iter) | |
1224 | { | |
1225 | int ret; | |
1226 | ||
1227 | ret = lttng_ht_del(relay_connections_ht, iter); | |
1228 | assert(!ret); | |
1229 | lttng_poll_del(events, pollfd); | |
1230 | ||
1231 | ret = close(pollfd); | |
1232 | if (ret < 0) { | |
1233 | ERR("Closing pollfd %d", pollfd); | |
1234 | } | |
1235 | } | |
1236 | ||
1237 | static | |
1238 | int relay_add_connection(int fd, struct lttng_poll_event *events, | |
1239 | struct lttng_ht *relay_connections_ht) | |
1240 | { | |
1241 | int ret; | |
1242 | struct relay_command *relay_connection; | |
1243 | ||
1244 | relay_connection = zmalloc(sizeof(struct relay_command)); | |
1245 | if (relay_connection == NULL) { | |
1246 | PERROR("Relay command zmalloc"); | |
1247 | ret = -1; | |
1248 | goto end; | |
1249 | } | |
1250 | ret = read(fd, relay_connection, sizeof(struct relay_command)); | |
1251 | if (ret < 0 || ret < sizeof(relay_connection)) { | |
1252 | PERROR("read relay cmd pipe"); | |
1253 | ret = -1; | |
1254 | goto end; | |
1255 | } | |
1256 | ||
1257 | lttng_ht_node_init_ulong(&relay_connection->sock_n, | |
1258 | (unsigned long) relay_connection->sock->fd); | |
1259 | lttng_ht_add_unique_ulong(relay_connections_ht, | |
1260 | &relay_connection->sock_n); | |
1261 | ret = lttng_poll_add(events, | |
1262 | relay_connection->sock->fd, | |
1263 | LPOLLIN | LPOLLRDHUP); | |
1264 | ||
1265 | end: | |
1266 | return ret; | |
1267 | } | |
1268 | ||
1269 | /* | |
1270 | * This thread does the actual work | |
1271 | */ | |
1272 | static | |
1273 | void *relay_thread_worker(void *data) | |
1274 | { | |
1275 | int i, ret, pollfd; | |
1276 | uint32_t revents, nb_fd; | |
1277 | struct relay_command *relay_connection; | |
1278 | struct lttng_poll_event events; | |
1279 | struct lttng_ht *relay_connections_ht; | |
1280 | struct lttng_ht_node_ulong *node; | |
1281 | struct lttng_ht_iter iter; | |
1282 | struct lttng_ht *streams_ht; | |
1283 | struct lttcomm_relayd_hdr recv_hdr; | |
1284 | ||
1285 | DBG("[thread] Relay worker started"); | |
1286 | ||
1287 | /* table of connections indexed on socket */ | |
1288 | relay_connections_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); | |
1289 | ||
1290 | /* tables of streams indexed by stream ID */ | |
1291 | streams_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); | |
1292 | ||
1293 | ret = create_thread_poll_set(&events, 2); | |
1294 | if (ret < 0) { | |
1295 | goto error_poll_create; | |
1296 | } | |
1297 | ||
1298 | ret = lttng_poll_add(&events, relay_cmd_pipe[0], LPOLLIN | LPOLLRDHUP); | |
1299 | if (ret < 0) { | |
1300 | goto error; | |
1301 | } | |
1302 | ||
1303 | while (1) { | |
1304 | /* Zeroed the events structure */ | |
1305 | lttng_poll_reset(&events); | |
1306 | ||
1307 | nb_fd = LTTNG_POLL_GETNB(&events); | |
1308 | ||
1309 | /* Infinite blocking call, waiting for transmission */ | |
1310 | restart: | |
1311 | ret = lttng_poll_wait(&events, -1); | |
1312 | if (ret < 0) { | |
1313 | /* | |
1314 | * Restart interrupted system call. | |
1315 | */ | |
1316 | if (errno == EINTR) { | |
1317 | goto restart; | |
1318 | } | |
1319 | goto error; | |
1320 | } | |
1321 | ||
1322 | for (i = 0; i < nb_fd; i++) { | |
1323 | /* Fetch once the poll data */ | |
1324 | revents = LTTNG_POLL_GETEV(&events, i); | |
1325 | pollfd = LTTNG_POLL_GETFD(&events, i); | |
1326 | ||
1327 | /* Thread quit pipe has been closed. Killing thread. */ | |
1328 | ret = check_thread_quit_pipe(pollfd, revents); | |
1329 | if (ret) { | |
1330 | goto error; | |
1331 | } | |
1332 | ||
1333 | /* Inspect the relay cmd pipe for new connection */ | |
1334 | if (pollfd == relay_cmd_pipe[0]) { | |
1335 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { | |
1336 | ERR("Relay pipe error"); | |
1337 | goto error; | |
1338 | } else if (revents & LPOLLIN) { | |
1339 | DBG("Relay command received"); | |
1340 | ret = relay_add_connection(relay_cmd_pipe[0], | |
1341 | &events, relay_connections_ht); | |
1342 | if (ret < 0) { | |
1343 | goto error; | |
1344 | } | |
1345 | } | |
1346 | } else if (revents > 0) { | |
1347 | lttng_ht_lookup(relay_connections_ht, | |
1348 | (void *)((unsigned long) pollfd), | |
1349 | &iter); | |
1350 | node = lttng_ht_iter_get_node_ulong(&iter); | |
1351 | if (node == NULL) { | |
1352 | DBG2("Relay sock %d not found", pollfd); | |
1353 | goto error; | |
1354 | } | |
1355 | relay_connection = caa_container_of(node, | |
1356 | struct relay_command, sock_n); | |
1357 | ||
1358 | if (revents & (LPOLLERR)) { | |
1359 | ERR("POLL ERROR"); | |
1360 | relay_cleanup_connection(relay_connections_ht, | |
1361 | &events, streams_ht, pollfd, &iter); | |
1362 | free(relay_connection); | |
1363 | } else if (revents & (LPOLLHUP | LPOLLRDHUP)) { | |
1364 | DBG("Socket %d hung up", pollfd); | |
1365 | relay_cleanup_connection(relay_connections_ht, | |
1366 | &events, streams_ht, pollfd, &iter); | |
1367 | if (relay_connection->type == RELAY_CONTROL) { | |
1368 | relay_delete_session(relay_connection, streams_ht); | |
1369 | } | |
1370 | free(relay_connection); | |
1371 | } else if (revents & LPOLLIN) { | |
1372 | /* control socket */ | |
1373 | if (relay_connection->type == RELAY_CONTROL) { | |
1374 | ret = relay_connection->sock->ops->recvmsg( | |
1375 | relay_connection->sock, &recv_hdr, | |
1376 | sizeof(struct lttcomm_relayd_hdr), MSG_WAITALL); | |
1377 | /* connection closed */ | |
1378 | if (ret <= 0) { | |
1379 | relay_cleanup_connection(relay_connections_ht, | |
1380 | &events, streams_ht, pollfd, &iter); | |
1381 | relay_delete_session(relay_connection, streams_ht); | |
1382 | free(relay_connection); | |
1383 | DBG("Control connection closed with %d", pollfd); | |
1384 | } else { | |
1385 | if (relay_connection->session) { | |
1386 | DBG2("Relay worker receiving data for session : %lu", | |
1387 | relay_connection->session->id); | |
1388 | } | |
1389 | ret = relay_process_control(&recv_hdr, | |
1390 | relay_connection, | |
1391 | streams_ht); | |
1392 | /* | |
1393 | * there was an error in processing a control | |
1394 | * command: clear the session | |
1395 | * */ | |
1396 | if (ret < 0) { | |
1397 | relay_cleanup_connection(relay_connections_ht, | |
1398 | &events, streams_ht, pollfd, &iter); | |
1399 | free(relay_connection); | |
1400 | DBG("Connection closed with %d", pollfd); | |
1401 | } | |
1402 | } | |
1403 | /* data socket */ | |
1404 | } else if (relay_connection->type == RELAY_DATA) { | |
1405 | ret = relay_process_data(relay_connection, streams_ht); | |
1406 | /* connection closed */ | |
1407 | if (ret < 0) { | |
1408 | relay_cleanup_connection(relay_connections_ht, | |
1409 | &events, streams_ht, pollfd, &iter); | |
1410 | relay_delete_session(relay_connection, streams_ht); | |
1411 | DBG("Data connection closed with %d", pollfd); | |
1412 | } | |
1413 | } | |
1414 | } | |
1415 | } | |
1416 | } | |
1417 | } | |
1418 | ||
1419 | error: | |
1420 | lttng_poll_clean(&events); | |
1421 | ||
1422 | /* empty the hash table and free the memory */ | |
1423 | cds_lfht_for_each_entry(relay_connections_ht->ht, &iter.iter, node, node) { | |
1424 | node = lttng_ht_iter_get_node_ulong(&iter); | |
1425 | if (node) { | |
1426 | relay_connection = caa_container_of(node, | |
1427 | struct relay_command, sock_n); | |
1428 | free(relay_connection); | |
1429 | } | |
1430 | ret = lttng_ht_del(relay_connections_ht, &iter); | |
1431 | assert(!ret); | |
1432 | } | |
1433 | error_poll_create: | |
1434 | free(data_buffer); | |
1435 | lttng_ht_destroy(relay_connections_ht); | |
1436 | DBG("Worker thread cleanup complete"); | |
1437 | stop_threads(); | |
1438 | return NULL; | |
1439 | } | |
1440 | ||
1441 | /* | |
1442 | * Create the relay command pipe to wake thread_manage_apps. | |
1443 | * Closed in cleanup(). | |
1444 | */ | |
1445 | static int create_relay_cmd_pipe(void) | |
1446 | { | |
1447 | int ret, i; | |
1448 | ||
1449 | ret = pipe(relay_cmd_pipe); | |
1450 | if (ret < 0) { | |
1451 | PERROR("relay cmd pipe"); | |
1452 | goto error; | |
1453 | } | |
1454 | ||
1455 | for (i = 0; i < 2; i++) { | |
1456 | ret = fcntl(relay_cmd_pipe[i], F_SETFD, FD_CLOEXEC); | |
1457 | if (ret < 0) { | |
1458 | PERROR("fcntl relay_cmd_pipe"); | |
1459 | goto error; | |
1460 | } | |
1461 | } | |
1462 | ||
1463 | error: | |
1464 | return ret; | |
1465 | } | |
1466 | ||
1467 | /* | |
1468 | * main | |
1469 | */ | |
1470 | int main(int argc, char **argv) | |
1471 | { | |
1472 | int ret = 0; | |
1473 | void *status; | |
1474 | ||
1475 | /* Create thread quit pipe */ | |
1476 | if ((ret = init_thread_quit_pipe()) < 0) { | |
1477 | goto error; | |
1478 | } | |
1479 | ||
1480 | /* Parse arguments */ | |
1481 | progname = argv[0]; | |
1482 | if ((ret = parse_args(argc, argv) < 0)) { | |
1483 | goto error; | |
1484 | } | |
1485 | ||
1486 | if ((ret = set_signal_handler()) < 0) { | |
1487 | goto exit; | |
1488 | } | |
1489 | ||
1490 | /* Daemonize */ | |
1491 | if (opt_daemon) { | |
1492 | ret = daemon(0, 0); | |
1493 | if (ret < 0) { | |
1494 | PERROR("daemon"); | |
1495 | goto error; | |
1496 | } | |
1497 | } | |
1498 | ||
1499 | /* Check if daemon is UID = 0 */ | |
1500 | is_root = !getuid(); | |
1501 | ||
1502 | if (!is_root) { | |
1503 | if (control_uri->port < 1024 || data_uri->port < 1024) { | |
1504 | ERR("Need to be root to use ports < 1024"); | |
1505 | ret = -1; | |
1506 | goto error; | |
1507 | } | |
1508 | } | |
1509 | ||
1510 | /* Setup the thread apps communication pipe. */ | |
1511 | if ((ret = create_relay_cmd_pipe()) < 0) { | |
1512 | goto exit; | |
1513 | } | |
1514 | ||
1515 | /* Init relay command queue. */ | |
1516 | cds_wfq_init(&relay_cmd_queue.queue); | |
1517 | ||
1518 | /* Set up max poll set size */ | |
1519 | lttng_poll_set_max_size(); | |
1520 | ||
1521 | /* Setup the dispatcher thread */ | |
1522 | ret = pthread_create(&dispatcher_thread, NULL, | |
1523 | relay_thread_dispatcher, (void *) NULL); | |
1524 | if (ret != 0) { | |
1525 | PERROR("pthread_create dispatcher"); | |
1526 | goto exit_dispatcher; | |
1527 | } | |
1528 | ||
1529 | /* Setup the worker thread */ | |
1530 | ret = pthread_create(&worker_thread, NULL, | |
1531 | relay_thread_worker, (void *) NULL); | |
1532 | if (ret != 0) { | |
1533 | PERROR("pthread_create worker"); | |
1534 | goto exit_worker; | |
1535 | } | |
1536 | ||
1537 | /* Setup the listener thread */ | |
1538 | ret = pthread_create(&listener_thread, NULL, | |
1539 | relay_thread_listener, (void *) NULL); | |
1540 | if (ret != 0) { | |
1541 | PERROR("pthread_create listener"); | |
1542 | goto exit_listener; | |
1543 | } | |
1544 | ||
1545 | exit_listener: | |
1546 | ret = pthread_join(listener_thread, &status); | |
1547 | if (ret != 0) { | |
1548 | PERROR("pthread_join"); | |
1549 | goto error; /* join error, exit without cleanup */ | |
1550 | } | |
1551 | ||
1552 | exit_worker: | |
1553 | ret = pthread_join(worker_thread, &status); | |
1554 | if (ret != 0) { | |
1555 | PERROR("pthread_join"); | |
1556 | goto error; /* join error, exit without cleanup */ | |
1557 | } | |
1558 | ||
1559 | exit_dispatcher: | |
1560 | ret = pthread_join(dispatcher_thread, &status); | |
1561 | if (ret != 0) { | |
1562 | PERROR("pthread_join"); | |
1563 | goto error; /* join error, exit without cleanup */ | |
1564 | } | |
1565 | ||
1566 | exit: | |
1567 | cleanup(); | |
1568 | if (!ret) { | |
1569 | exit(EXIT_SUCCESS); | |
1570 | } | |
1571 | error: | |
1572 | exit(EXIT_FAILURE); | |
1573 | } |