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Fix: channel names are not validated
[lttng-tools.git] / src / bin / lttng-sessiond / cmd.c
1 /*
2 * Copyright (C) 2012 - David Goulet <dgoulet@efficios.com>
3 *
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms of the GNU General Public License, version 2 only, as
6 * published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope that it will be useful, but WITHOUT
9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
11 * more details.
12 *
13 * You should have received a copy of the GNU General Public License along with
14 * this program; if not, write to the Free Software Foundation, Inc., 51
15 * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
16 */
17
18 #define _GNU_SOURCE
19 #include <assert.h>
20 #include <string.h>
21 #include <inttypes.h>
22 #include <urcu/list.h>
23 #include <urcu/uatomic.h>
24
25 #include <common/defaults.h>
26 #include <common/common.h>
27 #include <common/sessiond-comm/sessiond-comm.h>
28 #include <common/relayd/relayd.h>
29 #include <common/utils.h>
30
31 #include "channel.h"
32 #include "consumer.h"
33 #include "event.h"
34 #include "health-sessiond.h"
35 #include "kernel.h"
36 #include "kernel-consumer.h"
37 #include "lttng-sessiond.h"
38 #include "utils.h"
39 #include "syscall.h"
40
41 #include "cmd.h"
42
43 /*
44 * Used to keep a unique index for each relayd socket created where this value
45 * is associated with streams on the consumer so it can match the right relayd
46 * to send to. It must be accessed with the relayd_net_seq_idx_lock
47 * held.
48 */
49 static pthread_mutex_t relayd_net_seq_idx_lock = PTHREAD_MUTEX_INITIALIZER;
50 static uint64_t relayd_net_seq_idx;
51
52 /*
53 * Both functions below are special case for the Kernel domain when
54 * enabling/disabling all events.
55 */
56 static
57 int enable_kevent_all(struct ltt_session *session,
58 struct lttng_domain *domain, char *channel_name,
59 struct lttng_event *event,
60 char *filter_expression,
61 struct lttng_filter_bytecode *filter, int wpipe);
62 static
63 int disable_kevent_all(struct ltt_session *session, int domain,
64 char *channel_name,
65 struct lttng_event *event);
66
67 /*
68 * Create a session path used by list_lttng_sessions for the case that the
69 * session consumer is on the network.
70 */
71 static int build_network_session_path(char *dst, size_t size,
72 struct ltt_session *session)
73 {
74 int ret, kdata_port, udata_port;
75 struct lttng_uri *kuri = NULL, *uuri = NULL, *uri = NULL;
76 char tmp_uurl[PATH_MAX], tmp_urls[PATH_MAX];
77
78 assert(session);
79 assert(dst);
80
81 memset(tmp_urls, 0, sizeof(tmp_urls));
82 memset(tmp_uurl, 0, sizeof(tmp_uurl));
83
84 kdata_port = udata_port = DEFAULT_NETWORK_DATA_PORT;
85
86 if (session->kernel_session && session->kernel_session->consumer) {
87 kuri = &session->kernel_session->consumer->dst.net.control;
88 kdata_port = session->kernel_session->consumer->dst.net.data.port;
89 }
90
91 if (session->ust_session && session->ust_session->consumer) {
92 uuri = &session->ust_session->consumer->dst.net.control;
93 udata_port = session->ust_session->consumer->dst.net.data.port;
94 }
95
96 if (uuri == NULL && kuri == NULL) {
97 uri = &session->consumer->dst.net.control;
98 kdata_port = session->consumer->dst.net.data.port;
99 } else if (kuri && uuri) {
100 ret = uri_compare(kuri, uuri);
101 if (ret) {
102 /* Not Equal */
103 uri = kuri;
104 /* Build uuri URL string */
105 ret = uri_to_str_url(uuri, tmp_uurl, sizeof(tmp_uurl));
106 if (ret < 0) {
107 goto error;
108 }
109 } else {
110 uri = kuri;
111 }
112 } else if (kuri && uuri == NULL) {
113 uri = kuri;
114 } else if (uuri && kuri == NULL) {
115 uri = uuri;
116 }
117
118 ret = uri_to_str_url(uri, tmp_urls, sizeof(tmp_urls));
119 if (ret < 0) {
120 goto error;
121 }
122
123 /*
124 * Do we have a UST url set. If yes, this means we have both kernel and UST
125 * to print.
126 */
127 if (*tmp_uurl != '\0') {
128 ret = snprintf(dst, size, "[K]: %s [data: %d] -- [U]: %s [data: %d]",
129 tmp_urls, kdata_port, tmp_uurl, udata_port);
130 } else {
131 int dport;
132 if (kuri || (!kuri && !uuri)) {
133 dport = kdata_port;
134 } else {
135 /* No kernel URI, use the UST port. */
136 dport = udata_port;
137 }
138 ret = snprintf(dst, size, "%s [data: %d]", tmp_urls, dport);
139 }
140
141 error:
142 return ret;
143 }
144
145 /*
146 * Fill lttng_channel array of all channels.
147 */
148 static void list_lttng_channels(int domain, struct ltt_session *session,
149 struct lttng_channel *channels)
150 {
151 int i = 0;
152 struct ltt_kernel_channel *kchan;
153
154 DBG("Listing channels for session %s", session->name);
155
156 switch (domain) {
157 case LTTNG_DOMAIN_KERNEL:
158 /* Kernel channels */
159 if (session->kernel_session != NULL) {
160 cds_list_for_each_entry(kchan,
161 &session->kernel_session->channel_list.head, list) {
162 /* Copy lttng_channel struct to array */
163 memcpy(&channels[i], kchan->channel, sizeof(struct lttng_channel));
164 channels[i].enabled = kchan->enabled;
165 i++;
166 }
167 }
168 break;
169 case LTTNG_DOMAIN_UST:
170 {
171 struct lttng_ht_iter iter;
172 struct ltt_ust_channel *uchan;
173
174 rcu_read_lock();
175 cds_lfht_for_each_entry(session->ust_session->domain_global.channels->ht,
176 &iter.iter, uchan, node.node) {
177 strncpy(channels[i].name, uchan->name, LTTNG_SYMBOL_NAME_LEN);
178 channels[i].attr.overwrite = uchan->attr.overwrite;
179 channels[i].attr.subbuf_size = uchan->attr.subbuf_size;
180 channels[i].attr.num_subbuf = uchan->attr.num_subbuf;
181 channels[i].attr.switch_timer_interval =
182 uchan->attr.switch_timer_interval;
183 channels[i].attr.read_timer_interval =
184 uchan->attr.read_timer_interval;
185 channels[i].enabled = uchan->enabled;
186 channels[i].attr.tracefile_size = uchan->tracefile_size;
187 channels[i].attr.tracefile_count = uchan->tracefile_count;
188 switch (uchan->attr.output) {
189 case LTTNG_UST_MMAP:
190 default:
191 channels[i].attr.output = LTTNG_EVENT_MMAP;
192 break;
193 }
194 i++;
195 }
196 rcu_read_unlock();
197 break;
198 }
199 default:
200 break;
201 }
202 }
203
204 /*
205 * Create a list of agent domain events.
206 *
207 * Return number of events in list on success or else a negative value.
208 */
209 static int list_lttng_agent_events(struct agent *agt,
210 struct lttng_event **events)
211 {
212 int i = 0, ret = 0;
213 unsigned int nb_event = 0;
214 struct agent_event *event;
215 struct lttng_event *tmp_events;
216 struct lttng_ht_iter iter;
217
218 assert(agt);
219 assert(events);
220
221 DBG3("Listing agent events");
222
223 rcu_read_lock();
224 nb_event = lttng_ht_get_count(agt->events);
225 rcu_read_unlock();
226 if (nb_event == 0) {
227 ret = nb_event;
228 goto error;
229 }
230
231 tmp_events = zmalloc(nb_event * sizeof(*tmp_events));
232 if (!tmp_events) {
233 PERROR("zmalloc agent events session");
234 ret = -LTTNG_ERR_FATAL;
235 goto error;
236 }
237
238 rcu_read_lock();
239 cds_lfht_for_each_entry(agt->events->ht, &iter.iter, event, node.node) {
240 strncpy(tmp_events[i].name, event->name, sizeof(tmp_events[i].name));
241 tmp_events[i].name[sizeof(tmp_events[i].name) - 1] = '\0';
242 tmp_events[i].enabled = event->enabled;
243 tmp_events[i].loglevel = event->loglevel;
244 tmp_events[i].loglevel_type = event->loglevel_type;
245 i++;
246 }
247 rcu_read_unlock();
248
249 *events = tmp_events;
250 ret = nb_event;
251
252 error:
253 assert(nb_event == i);
254 return ret;
255 }
256
257 /*
258 * Create a list of ust global domain events.
259 */
260 static int list_lttng_ust_global_events(char *channel_name,
261 struct ltt_ust_domain_global *ust_global, struct lttng_event **events)
262 {
263 int i = 0, ret = 0;
264 unsigned int nb_event = 0;
265 struct lttng_ht_iter iter;
266 struct lttng_ht_node_str *node;
267 struct ltt_ust_channel *uchan;
268 struct ltt_ust_event *uevent;
269 struct lttng_event *tmp;
270
271 DBG("Listing UST global events for channel %s", channel_name);
272
273 rcu_read_lock();
274
275 lttng_ht_lookup(ust_global->channels, (void *)channel_name, &iter);
276 node = lttng_ht_iter_get_node_str(&iter);
277 if (node == NULL) {
278 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
279 goto error;
280 }
281
282 uchan = caa_container_of(&node->node, struct ltt_ust_channel, node.node);
283
284 nb_event += lttng_ht_get_count(uchan->events);
285
286 if (nb_event == 0) {
287 ret = nb_event;
288 goto error;
289 }
290
291 DBG3("Listing UST global %d events", nb_event);
292
293 tmp = zmalloc(nb_event * sizeof(struct lttng_event));
294 if (tmp == NULL) {
295 ret = LTTNG_ERR_FATAL;
296 goto error;
297 }
298
299 cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) {
300 strncpy(tmp[i].name, uevent->attr.name, LTTNG_SYMBOL_NAME_LEN);
301 tmp[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
302 tmp[i].enabled = uevent->enabled;
303
304 switch (uevent->attr.instrumentation) {
305 case LTTNG_UST_TRACEPOINT:
306 tmp[i].type = LTTNG_EVENT_TRACEPOINT;
307 break;
308 case LTTNG_UST_PROBE:
309 tmp[i].type = LTTNG_EVENT_PROBE;
310 break;
311 case LTTNG_UST_FUNCTION:
312 tmp[i].type = LTTNG_EVENT_FUNCTION;
313 break;
314 }
315
316 tmp[i].loglevel = uevent->attr.loglevel;
317 switch (uevent->attr.loglevel_type) {
318 case LTTNG_UST_LOGLEVEL_ALL:
319 tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL;
320 break;
321 case LTTNG_UST_LOGLEVEL_RANGE:
322 tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_RANGE;
323 break;
324 case LTTNG_UST_LOGLEVEL_SINGLE:
325 tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_SINGLE;
326 break;
327 }
328 if (uevent->filter) {
329 tmp[i].filter = 1;
330 }
331 if (uevent->exclusion) {
332 tmp[i].exclusion = 1;
333 }
334 i++;
335 }
336
337 ret = nb_event;
338 *events = tmp;
339
340 error:
341 rcu_read_unlock();
342 return ret;
343 }
344
345 /*
346 * Fill lttng_event array of all kernel events in the channel.
347 */
348 static int list_lttng_kernel_events(char *channel_name,
349 struct ltt_kernel_session *kernel_session, struct lttng_event **events)
350 {
351 int i = 0, ret;
352 unsigned int nb_event;
353 struct ltt_kernel_event *event;
354 struct ltt_kernel_channel *kchan;
355
356 kchan = trace_kernel_get_channel_by_name(channel_name, kernel_session);
357 if (kchan == NULL) {
358 ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND;
359 goto error;
360 }
361
362 nb_event = kchan->event_count;
363
364 DBG("Listing events for channel %s", kchan->channel->name);
365
366 if (nb_event == 0) {
367 *events = NULL;
368 goto syscall;
369 }
370
371 *events = zmalloc(nb_event * sizeof(struct lttng_event));
372 if (*events == NULL) {
373 ret = LTTNG_ERR_FATAL;
374 goto error;
375 }
376
377 /* Kernel channels */
378 cds_list_for_each_entry(event, &kchan->events_list.head , list) {
379 strncpy((*events)[i].name, event->event->name, LTTNG_SYMBOL_NAME_LEN);
380 (*events)[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
381 (*events)[i].enabled = event->enabled;
382
383 switch (event->event->instrumentation) {
384 case LTTNG_KERNEL_TRACEPOINT:
385 (*events)[i].type = LTTNG_EVENT_TRACEPOINT;
386 break;
387 case LTTNG_KERNEL_KRETPROBE:
388 (*events)[i].type = LTTNG_EVENT_FUNCTION;
389 memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe,
390 sizeof(struct lttng_kernel_kprobe));
391 break;
392 case LTTNG_KERNEL_KPROBE:
393 (*events)[i].type = LTTNG_EVENT_PROBE;
394 memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe,
395 sizeof(struct lttng_kernel_kprobe));
396 break;
397 case LTTNG_KERNEL_FUNCTION:
398 (*events)[i].type = LTTNG_EVENT_FUNCTION;
399 memcpy(&((*events)[i].attr.ftrace), &event->event->u.ftrace,
400 sizeof(struct lttng_kernel_function));
401 break;
402 case LTTNG_KERNEL_NOOP:
403 (*events)[i].type = LTTNG_EVENT_NOOP;
404 break;
405 case LTTNG_KERNEL_SYSCALL:
406 (*events)[i].type = LTTNG_EVENT_SYSCALL;
407 break;
408 case LTTNG_KERNEL_ALL:
409 assert(0);
410 break;
411 }
412 i++;
413 }
414
415 syscall:
416 if (syscall_table) {
417 ssize_t new_size;
418
419 new_size = syscall_list_channel(kchan, events, nb_event);
420 if (new_size < 0) {
421 free(events);
422 ret = -new_size;
423 goto error;
424 }
425 nb_event = new_size;
426 }
427
428 return nb_event;
429
430 error:
431 /* Negate the error code to differentiate the size from an error */
432 return -ret;
433 }
434
435 /*
436 * Add URI so the consumer output object. Set the correct path depending on the
437 * domain adding the default trace directory.
438 */
439 static int add_uri_to_consumer(struct consumer_output *consumer,
440 struct lttng_uri *uri, int domain, const char *session_name)
441 {
442 int ret = LTTNG_OK;
443 const char *default_trace_dir;
444
445 assert(uri);
446
447 if (consumer == NULL) {
448 DBG("No consumer detected. Don't add URI. Stopping.");
449 ret = LTTNG_ERR_NO_CONSUMER;
450 goto error;
451 }
452
453 switch (domain) {
454 case LTTNG_DOMAIN_KERNEL:
455 default_trace_dir = DEFAULT_KERNEL_TRACE_DIR;
456 break;
457 case LTTNG_DOMAIN_UST:
458 default_trace_dir = DEFAULT_UST_TRACE_DIR;
459 break;
460 default:
461 /*
462 * This case is possible is we try to add the URI to the global tracing
463 * session consumer object which in this case there is no subdir.
464 */
465 default_trace_dir = "";
466 }
467
468 switch (uri->dtype) {
469 case LTTNG_DST_IPV4:
470 case LTTNG_DST_IPV6:
471 DBG2("Setting network URI to consumer");
472
473 if (consumer->type == CONSUMER_DST_NET) {
474 if ((uri->stype == LTTNG_STREAM_CONTROL &&
475 consumer->dst.net.control_isset) ||
476 (uri->stype == LTTNG_STREAM_DATA &&
477 consumer->dst.net.data_isset)) {
478 ret = LTTNG_ERR_URL_EXIST;
479 goto error;
480 }
481 } else {
482 memset(&consumer->dst.net, 0, sizeof(consumer->dst.net));
483 }
484
485 consumer->type = CONSUMER_DST_NET;
486
487 /* Set URI into consumer output object */
488 ret = consumer_set_network_uri(consumer, uri);
489 if (ret < 0) {
490 ret = -ret;
491 goto error;
492 } else if (ret == 1) {
493 /*
494 * URI was the same in the consumer so we do not append the subdir
495 * again so to not duplicate output dir.
496 */
497 ret = LTTNG_OK;
498 goto error;
499 }
500
501 if (uri->stype == LTTNG_STREAM_CONTROL && strlen(uri->subdir) == 0) {
502 ret = consumer_set_subdir(consumer, session_name);
503 if (ret < 0) {
504 ret = LTTNG_ERR_FATAL;
505 goto error;
506 }
507 }
508
509 if (uri->stype == LTTNG_STREAM_CONTROL) {
510 /* On a new subdir, reappend the default trace dir. */
511 strncat(consumer->subdir, default_trace_dir,
512 sizeof(consumer->subdir) - strlen(consumer->subdir) - 1);
513 DBG3("Append domain trace name to subdir %s", consumer->subdir);
514 }
515
516 break;
517 case LTTNG_DST_PATH:
518 DBG2("Setting trace directory path from URI to %s", uri->dst.path);
519 memset(consumer->dst.trace_path, 0,
520 sizeof(consumer->dst.trace_path));
521 strncpy(consumer->dst.trace_path, uri->dst.path,
522 sizeof(consumer->dst.trace_path));
523 /* Append default trace dir */
524 strncat(consumer->dst.trace_path, default_trace_dir,
525 sizeof(consumer->dst.trace_path) -
526 strlen(consumer->dst.trace_path) - 1);
527 /* Flag consumer as local. */
528 consumer->type = CONSUMER_DST_LOCAL;
529 break;
530 }
531
532 ret = LTTNG_OK;
533
534 error:
535 return ret;
536 }
537
538 /*
539 * Init tracing by creating trace directory and sending fds kernel consumer.
540 */
541 static int init_kernel_tracing(struct ltt_kernel_session *session)
542 {
543 int ret = 0;
544 struct lttng_ht_iter iter;
545 struct consumer_socket *socket;
546
547 assert(session);
548
549 rcu_read_lock();
550
551 if (session->consumer_fds_sent == 0 && session->consumer != NULL) {
552 cds_lfht_for_each_entry(session->consumer->socks->ht, &iter.iter,
553 socket, node.node) {
554 pthread_mutex_lock(socket->lock);
555 ret = kernel_consumer_send_session(socket, session);
556 pthread_mutex_unlock(socket->lock);
557 if (ret < 0) {
558 ret = LTTNG_ERR_KERN_CONSUMER_FAIL;
559 goto error;
560 }
561 }
562 }
563
564 error:
565 rcu_read_unlock();
566 return ret;
567 }
568
569 /*
570 * Create a socket to the relayd using the URI.
571 *
572 * On success, the relayd_sock pointer is set to the created socket.
573 * Else, it's stays untouched and a lttcomm error code is returned.
574 */
575 static int create_connect_relayd(struct lttng_uri *uri,
576 struct lttcomm_relayd_sock **relayd_sock)
577 {
578 int ret;
579 struct lttcomm_relayd_sock *rsock;
580
581 rsock = lttcomm_alloc_relayd_sock(uri, RELAYD_VERSION_COMM_MAJOR,
582 RELAYD_VERSION_COMM_MINOR);
583 if (!rsock) {
584 ret = LTTNG_ERR_FATAL;
585 goto error;
586 }
587
588 /*
589 * Connect to relayd so we can proceed with a session creation. This call
590 * can possibly block for an arbitrary amount of time to set the health
591 * state to be in poll execution.
592 */
593 health_poll_entry();
594 ret = relayd_connect(rsock);
595 health_poll_exit();
596 if (ret < 0) {
597 ERR("Unable to reach lttng-relayd");
598 ret = LTTNG_ERR_RELAYD_CONNECT_FAIL;
599 goto free_sock;
600 }
601
602 /* Create socket for control stream. */
603 if (uri->stype == LTTNG_STREAM_CONTROL) {
604 DBG3("Creating relayd stream socket from URI");
605
606 /* Check relayd version */
607 ret = relayd_version_check(rsock);
608 if (ret < 0) {
609 ret = LTTNG_ERR_RELAYD_VERSION_FAIL;
610 goto close_sock;
611 }
612 } else if (uri->stype == LTTNG_STREAM_DATA) {
613 DBG3("Creating relayd data socket from URI");
614 } else {
615 /* Command is not valid */
616 ERR("Relayd invalid stream type: %d", uri->stype);
617 ret = LTTNG_ERR_INVALID;
618 goto close_sock;
619 }
620
621 *relayd_sock = rsock;
622
623 return LTTNG_OK;
624
625 close_sock:
626 /* The returned value is not useful since we are on an error path. */
627 (void) relayd_close(rsock);
628 free_sock:
629 free(rsock);
630 error:
631 return ret;
632 }
633
634 /*
635 * Connect to the relayd using URI and send the socket to the right consumer.
636 */
637 static int send_consumer_relayd_socket(int domain, unsigned int session_id,
638 struct lttng_uri *relayd_uri, struct consumer_output *consumer,
639 struct consumer_socket *consumer_sock,
640 char *session_name, char *hostname, int session_live_timer)
641 {
642 int ret;
643 struct lttcomm_relayd_sock *rsock = NULL;
644
645 /* Connect to relayd and make version check if uri is the control. */
646 ret = create_connect_relayd(relayd_uri, &rsock);
647 if (ret != LTTNG_OK) {
648 goto error;
649 }
650 assert(rsock);
651
652 /* Set the network sequence index if not set. */
653 if (consumer->net_seq_index == (uint64_t) -1ULL) {
654 pthread_mutex_lock(&relayd_net_seq_idx_lock);
655 /*
656 * Increment net_seq_idx because we are about to transfer the
657 * new relayd socket to the consumer.
658 * Assign unique key so the consumer can match streams.
659 */
660 consumer->net_seq_index = ++relayd_net_seq_idx;
661 pthread_mutex_unlock(&relayd_net_seq_idx_lock);
662 }
663
664 /* Send relayd socket to consumer. */
665 ret = consumer_send_relayd_socket(consumer_sock, rsock, consumer,
666 relayd_uri->stype, session_id,
667 session_name, hostname, session_live_timer);
668 if (ret < 0) {
669 ret = LTTNG_ERR_ENABLE_CONSUMER_FAIL;
670 goto close_sock;
671 }
672
673 /* Flag that the corresponding socket was sent. */
674 if (relayd_uri->stype == LTTNG_STREAM_CONTROL) {
675 consumer_sock->control_sock_sent = 1;
676 } else if (relayd_uri->stype == LTTNG_STREAM_DATA) {
677 consumer_sock->data_sock_sent = 1;
678 }
679
680 ret = LTTNG_OK;
681
682 /*
683 * Close socket which was dup on the consumer side. The session daemon does
684 * NOT keep track of the relayd socket(s) once transfer to the consumer.
685 */
686
687 close_sock:
688 (void) relayd_close(rsock);
689 free(rsock);
690
691 error:
692 if (ret != LTTNG_OK) {
693 /*
694 * The consumer output for this session should not be used anymore
695 * since the relayd connection failed thus making any tracing or/and
696 * streaming not usable.
697 */
698 consumer->enabled = 0;
699 }
700 return ret;
701 }
702
703 /*
704 * Send both relayd sockets to a specific consumer and domain. This is a
705 * helper function to facilitate sending the information to the consumer for a
706 * session.
707 */
708 static int send_consumer_relayd_sockets(int domain, unsigned int session_id,
709 struct consumer_output *consumer, struct consumer_socket *sock,
710 char *session_name, char *hostname, int session_live_timer)
711 {
712 int ret = LTTNG_OK;
713
714 assert(consumer);
715 assert(sock);
716
717 /* Sending control relayd socket. */
718 if (!sock->control_sock_sent) {
719 ret = send_consumer_relayd_socket(domain, session_id,
720 &consumer->dst.net.control, consumer, sock,
721 session_name, hostname, session_live_timer);
722 if (ret != LTTNG_OK) {
723 goto error;
724 }
725 }
726
727 /* Sending data relayd socket. */
728 if (!sock->data_sock_sent) {
729 ret = send_consumer_relayd_socket(domain, session_id,
730 &consumer->dst.net.data, consumer, sock,
731 session_name, hostname, session_live_timer);
732 if (ret != LTTNG_OK) {
733 goto error;
734 }
735 }
736
737 error:
738 return ret;
739 }
740
741 /*
742 * Setup relayd connections for a tracing session. First creates the socket to
743 * the relayd and send them to the right domain consumer. Consumer type MUST be
744 * network.
745 */
746 int cmd_setup_relayd(struct ltt_session *session)
747 {
748 int ret = LTTNG_OK;
749 struct ltt_ust_session *usess;
750 struct ltt_kernel_session *ksess;
751 struct consumer_socket *socket;
752 struct lttng_ht_iter iter;
753
754 assert(session);
755
756 usess = session->ust_session;
757 ksess = session->kernel_session;
758
759 DBG("Setting relayd for session %s", session->name);
760
761 rcu_read_lock();
762
763 if (usess && usess->consumer && usess->consumer->type == CONSUMER_DST_NET
764 && usess->consumer->enabled) {
765 /* For each consumer socket, send relayd sockets */
766 cds_lfht_for_each_entry(usess->consumer->socks->ht, &iter.iter,
767 socket, node.node) {
768 pthread_mutex_lock(socket->lock);
769 ret = send_consumer_relayd_sockets(LTTNG_DOMAIN_UST, session->id,
770 usess->consumer, socket,
771 session->name, session->hostname,
772 session->live_timer);
773 pthread_mutex_unlock(socket->lock);
774 if (ret != LTTNG_OK) {
775 goto error;
776 }
777 /* Session is now ready for network streaming. */
778 session->net_handle = 1;
779 }
780 }
781
782 if (ksess && ksess->consumer && ksess->consumer->type == CONSUMER_DST_NET
783 && ksess->consumer->enabled) {
784 cds_lfht_for_each_entry(ksess->consumer->socks->ht, &iter.iter,
785 socket, node.node) {
786 pthread_mutex_lock(socket->lock);
787 ret = send_consumer_relayd_sockets(LTTNG_DOMAIN_KERNEL, session->id,
788 ksess->consumer, socket,
789 session->name, session->hostname,
790 session->live_timer);
791 pthread_mutex_unlock(socket->lock);
792 if (ret != LTTNG_OK) {
793 goto error;
794 }
795 /* Session is now ready for network streaming. */
796 session->net_handle = 1;
797 }
798 }
799
800 error:
801 rcu_read_unlock();
802 return ret;
803 }
804
805 /*
806 * Start a kernel session by opening all necessary streams.
807 */
808 static int start_kernel_session(struct ltt_kernel_session *ksess, int wpipe)
809 {
810 int ret;
811 struct ltt_kernel_channel *kchan;
812
813 /* Open kernel metadata */
814 if (ksess->metadata == NULL && ksess->output_traces) {
815 ret = kernel_open_metadata(ksess);
816 if (ret < 0) {
817 ret = LTTNG_ERR_KERN_META_FAIL;
818 goto error;
819 }
820 }
821
822 /* Open kernel metadata stream */
823 if (ksess->metadata && ksess->metadata_stream_fd < 0) {
824 ret = kernel_open_metadata_stream(ksess);
825 if (ret < 0) {
826 ERR("Kernel create metadata stream failed");
827 ret = LTTNG_ERR_KERN_STREAM_FAIL;
828 goto error;
829 }
830 }
831
832 /* For each channel */
833 cds_list_for_each_entry(kchan, &ksess->channel_list.head, list) {
834 if (kchan->stream_count == 0) {
835 ret = kernel_open_channel_stream(kchan);
836 if (ret < 0) {
837 ret = LTTNG_ERR_KERN_STREAM_FAIL;
838 goto error;
839 }
840 /* Update the stream global counter */
841 ksess->stream_count_global += ret;
842 }
843 }
844
845 /* Setup kernel consumer socket and send fds to it */
846 ret = init_kernel_tracing(ksess);
847 if (ret != 0) {
848 ret = LTTNG_ERR_KERN_START_FAIL;
849 goto error;
850 }
851
852 /* This start the kernel tracing */
853 ret = kernel_start_session(ksess);
854 if (ret < 0) {
855 ret = LTTNG_ERR_KERN_START_FAIL;
856 goto error;
857 }
858
859 /* Quiescent wait after starting trace */
860 kernel_wait_quiescent(kernel_tracer_fd);
861
862 ksess->active = 1;
863
864 ret = LTTNG_OK;
865
866 error:
867 return ret;
868 }
869
870 /*
871 * Command LTTNG_DISABLE_CHANNEL processed by the client thread.
872 */
873 int cmd_disable_channel(struct ltt_session *session, int domain,
874 char *channel_name)
875 {
876 int ret;
877 struct ltt_ust_session *usess;
878
879 usess = session->ust_session;
880
881 rcu_read_lock();
882
883 switch (domain) {
884 case LTTNG_DOMAIN_KERNEL:
885 {
886 ret = channel_kernel_disable(session->kernel_session,
887 channel_name);
888 if (ret != LTTNG_OK) {
889 goto error;
890 }
891
892 kernel_wait_quiescent(kernel_tracer_fd);
893 break;
894 }
895 case LTTNG_DOMAIN_UST:
896 {
897 struct ltt_ust_channel *uchan;
898 struct lttng_ht *chan_ht;
899
900 chan_ht = usess->domain_global.channels;
901
902 uchan = trace_ust_find_channel_by_name(chan_ht, channel_name);
903 if (uchan == NULL) {
904 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
905 goto error;
906 }
907
908 ret = channel_ust_disable(usess, uchan);
909 if (ret != LTTNG_OK) {
910 goto error;
911 }
912 break;
913 }
914 #if 0
915 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
916 case LTTNG_DOMAIN_UST_EXEC_NAME:
917 case LTTNG_DOMAIN_UST_PID:
918 #endif
919 default:
920 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
921 goto error;
922 }
923
924 ret = LTTNG_OK;
925
926 error:
927 rcu_read_unlock();
928 return ret;
929 }
930
931 /*
932 * Command LTTNG_ENABLE_CHANNEL processed by the client thread.
933 *
934 * The wpipe arguments is used as a notifier for the kernel thread.
935 */
936 int cmd_enable_channel(struct ltt_session *session,
937 struct lttng_domain *domain, struct lttng_channel *attr, int wpipe)
938 {
939 int ret;
940 struct ltt_ust_session *usess = session->ust_session;
941 struct lttng_ht *chan_ht;
942 size_t len;
943
944 assert(session);
945 assert(attr);
946 assert(domain);
947
948 len = strnlen(attr->name, sizeof(attr->name));
949
950 /* Validate channel name */
951 if (attr->name[0] == '.' ||
952 memchr(attr->name, '/', len) != NULL) {
953 ret = LTTNG_ERR_INVALID_CHANNEL_NAME;
954 goto end;
955 }
956
957 DBG("Enabling channel %s for session %s", attr->name, session->name);
958
959 rcu_read_lock();
960
961 /*
962 * Don't try to enable a channel if the session has been started at
963 * some point in time before. The tracer does not allow it.
964 */
965 if (session->has_been_started) {
966 ret = LTTNG_ERR_TRACE_ALREADY_STARTED;
967 goto error;
968 }
969
970 /*
971 * If the session is a live session, remove the switch timer, the
972 * live timer does the same thing but sends also synchronisation
973 * beacons for inactive streams.
974 */
975 if (session->live_timer > 0) {
976 attr->attr.live_timer_interval = session->live_timer;
977 attr->attr.switch_timer_interval = 0;
978 }
979
980 /*
981 * The ringbuffer (both in user space and kernel) behave badly in overwrite
982 * mode and with less than 2 subbuf so block it right away and send back an
983 * invalid attribute error.
984 */
985 if (attr->attr.overwrite && attr->attr.num_subbuf < 2) {
986 ret = LTTNG_ERR_INVALID;
987 goto error;
988 }
989
990 switch (domain->type) {
991 case LTTNG_DOMAIN_KERNEL:
992 {
993 struct ltt_kernel_channel *kchan;
994
995 kchan = trace_kernel_get_channel_by_name(attr->name,
996 session->kernel_session);
997 if (kchan == NULL) {
998 ret = channel_kernel_create(session->kernel_session, attr, wpipe);
999 if (attr->name[0] != '\0') {
1000 session->kernel_session->has_non_default_channel = 1;
1001 }
1002 } else {
1003 ret = channel_kernel_enable(session->kernel_session, kchan);
1004 }
1005
1006 if (ret != LTTNG_OK) {
1007 goto error;
1008 }
1009
1010 kernel_wait_quiescent(kernel_tracer_fd);
1011 break;
1012 }
1013 case LTTNG_DOMAIN_UST:
1014 {
1015 struct ltt_ust_channel *uchan;
1016
1017 chan_ht = usess->domain_global.channels;
1018
1019 uchan = trace_ust_find_channel_by_name(chan_ht, attr->name);
1020 if (uchan == NULL) {
1021 ret = channel_ust_create(usess, attr, domain->buf_type);
1022 if (attr->name[0] != '\0') {
1023 usess->has_non_default_channel = 1;
1024 }
1025 } else {
1026 ret = channel_ust_enable(usess, uchan);
1027 }
1028 break;
1029 }
1030 default:
1031 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
1032 goto error;
1033 }
1034
1035 error:
1036 rcu_read_unlock();
1037 end:
1038 return ret;
1039 }
1040
1041
1042 /*
1043 * Command LTTNG_DISABLE_EVENT processed by the client thread.
1044 */
1045 int cmd_disable_event(struct ltt_session *session, int domain,
1046 char *channel_name,
1047 struct lttng_event *event)
1048 {
1049 int ret;
1050 char *event_name;
1051
1052 DBG("Disable event command for event \'%s\'", event->name);
1053
1054 event_name = event->name;
1055
1056 /* Error out on unhandled search criteria */
1057 if (event->loglevel_type || event->loglevel != -1 || event->enabled
1058 || event->pid || event->filter || event->exclusion) {
1059 return LTTNG_ERR_UNK;
1060 }
1061 /* Special handling for kernel domain all events. */
1062 if (domain == LTTNG_DOMAIN_KERNEL && !strcmp(event_name, "*")) {
1063 return disable_kevent_all(session, domain, channel_name, event);
1064 }
1065
1066 rcu_read_lock();
1067
1068 switch (domain) {
1069 case LTTNG_DOMAIN_KERNEL:
1070 {
1071 struct ltt_kernel_channel *kchan;
1072 struct ltt_kernel_session *ksess;
1073
1074 ksess = session->kernel_session;
1075
1076 /*
1077 * If a non-default channel has been created in the
1078 * session, explicitely require that -c chan_name needs
1079 * to be provided.
1080 */
1081 if (ksess->has_non_default_channel && channel_name[0] == '\0') {
1082 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
1083 goto error;
1084 }
1085
1086 kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
1087 if (kchan == NULL) {
1088 ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND;
1089 goto error;
1090 }
1091
1092 switch (event->type) {
1093 case LTTNG_EVENT_ALL:
1094 case LTTNG_EVENT_TRACEPOINT:
1095 ret = event_kernel_disable_tracepoint(kchan, event_name);
1096 if (ret != LTTNG_OK) {
1097 goto error;
1098 }
1099 break;
1100 case LTTNG_EVENT_SYSCALL:
1101 ret = event_kernel_disable_syscall(kchan, event_name);
1102 if (ret != LTTNG_OK) {
1103 goto error;
1104 }
1105 break;
1106 default:
1107 ret = LTTNG_ERR_UNK;
1108 goto error;
1109 }
1110
1111 kernel_wait_quiescent(kernel_tracer_fd);
1112 break;
1113 }
1114 case LTTNG_DOMAIN_UST:
1115 {
1116 struct ltt_ust_channel *uchan;
1117 struct ltt_ust_session *usess;
1118
1119 usess = session->ust_session;
1120
1121 /*
1122 * If a non-default channel has been created in the
1123 * session, explicitely require that -c chan_name needs
1124 * to be provided.
1125 */
1126 if (usess->has_non_default_channel && channel_name[0] == '\0') {
1127 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
1128 goto error;
1129 }
1130
1131 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
1132 channel_name);
1133 if (uchan == NULL) {
1134 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
1135 goto error;
1136 }
1137
1138 switch (event->type) {
1139 case LTTNG_EVENT_ALL:
1140 ret = event_ust_disable_tracepoint(usess, uchan, event_name);
1141 if (ret != LTTNG_OK) {
1142 goto error;
1143 }
1144 break;
1145 default:
1146 ret = LTTNG_ERR_UNK;
1147 goto error;
1148 }
1149
1150 DBG3("Disable UST event %s in channel %s completed", event_name,
1151 channel_name);
1152 break;
1153 }
1154 case LTTNG_DOMAIN_LOG4J:
1155 case LTTNG_DOMAIN_JUL:
1156 {
1157 struct agent *agt;
1158 struct ltt_ust_session *usess = session->ust_session;
1159
1160 assert(usess);
1161
1162 switch (event->type) {
1163 case LTTNG_EVENT_ALL:
1164 break;
1165 default:
1166 ret = LTTNG_ERR_UNK;
1167 goto error;
1168 }
1169
1170 agt = trace_ust_find_agent(usess, domain);
1171 if (!agt) {
1172 ret = -LTTNG_ERR_UST_EVENT_NOT_FOUND;
1173 goto error;
1174 }
1175 /* The wild card * means that everything should be disabled. */
1176 if (strncmp(event->name, "*", 1) == 0 && strlen(event->name) == 1) {
1177 ret = event_agent_disable_all(usess, agt);
1178 } else {
1179 ret = event_agent_disable(usess, agt, event_name);
1180 }
1181 if (ret != LTTNG_OK) {
1182 goto error;
1183 }
1184
1185 break;
1186 }
1187 #if 0
1188 case LTTNG_DOMAIN_UST_EXEC_NAME:
1189 case LTTNG_DOMAIN_UST_PID:
1190 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
1191 #endif
1192 default:
1193 ret = LTTNG_ERR_UND;
1194 goto error;
1195 }
1196
1197 ret = LTTNG_OK;
1198
1199 error:
1200 rcu_read_unlock();
1201 return ret;
1202 }
1203
1204 /*
1205 * Command LTTNG_DISABLE_EVENT for event "*" processed by the client thread.
1206 */
1207 static
1208 int disable_kevent_all(struct ltt_session *session, int domain,
1209 char *channel_name,
1210 struct lttng_event *event)
1211 {
1212 int ret;
1213
1214 rcu_read_lock();
1215
1216 switch (domain) {
1217 case LTTNG_DOMAIN_KERNEL:
1218 {
1219 struct ltt_kernel_session *ksess;
1220 struct ltt_kernel_channel *kchan;
1221
1222 ksess = session->kernel_session;
1223
1224 /*
1225 * If a non-default channel has been created in the
1226 * session, explicitely require that -c chan_name needs
1227 * to be provided.
1228 */
1229 if (ksess->has_non_default_channel && channel_name[0] == '\0') {
1230 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
1231 goto error;
1232 }
1233
1234 kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
1235 if (kchan == NULL) {
1236 ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND;
1237 goto error;
1238 }
1239
1240 switch (event->type) {
1241 case LTTNG_EVENT_ALL:
1242 ret = event_kernel_disable_all(kchan);
1243 if (ret != LTTNG_OK) {
1244 goto error;
1245 }
1246 break;
1247 case LTTNG_EVENT_SYSCALL:
1248 ret = event_kernel_disable_syscall(kchan, "");
1249 if (ret != LTTNG_OK) {
1250 goto error;
1251 }
1252 break;
1253 default:
1254 ret = LTTNG_ERR_UNK;
1255 goto error;
1256 }
1257
1258 kernel_wait_quiescent(kernel_tracer_fd);
1259 break;
1260 }
1261 default:
1262 ret = LTTNG_ERR_UND;
1263 goto error;
1264 }
1265
1266 ret = LTTNG_OK;
1267
1268 error:
1269 rcu_read_unlock();
1270 return ret;
1271 }
1272
1273 /*
1274 * Command LTTNG_ADD_CONTEXT processed by the client thread.
1275 */
1276 int cmd_add_context(struct ltt_session *session, int domain,
1277 char *channel_name, struct lttng_event_context *ctx, int kwpipe)
1278 {
1279 int ret, chan_kern_created = 0, chan_ust_created = 0;
1280
1281 switch (domain) {
1282 case LTTNG_DOMAIN_KERNEL:
1283 assert(session->kernel_session);
1284
1285 if (session->kernel_session->channel_count == 0) {
1286 /* Create default channel */
1287 ret = channel_kernel_create(session->kernel_session, NULL, kwpipe);
1288 if (ret != LTTNG_OK) {
1289 goto error;
1290 }
1291 chan_kern_created = 1;
1292 }
1293 /* Add kernel context to kernel tracer */
1294 ret = context_kernel_add(session->kernel_session, ctx, channel_name);
1295 if (ret != LTTNG_OK) {
1296 goto error;
1297 }
1298 break;
1299 case LTTNG_DOMAIN_UST:
1300 {
1301 struct ltt_ust_session *usess = session->ust_session;
1302 unsigned int chan_count;
1303
1304 assert(usess);
1305
1306 chan_count = lttng_ht_get_count(usess->domain_global.channels);
1307 if (chan_count == 0) {
1308 struct lttng_channel *attr;
1309 /* Create default channel */
1310 attr = channel_new_default_attr(domain, usess->buffer_type);
1311 if (attr == NULL) {
1312 ret = LTTNG_ERR_FATAL;
1313 goto error;
1314 }
1315
1316 ret = channel_ust_create(usess, attr, usess->buffer_type);
1317 if (ret != LTTNG_OK) {
1318 free(attr);
1319 goto error;
1320 }
1321 free(attr);
1322 chan_ust_created = 1;
1323 }
1324
1325 ret = context_ust_add(usess, domain, ctx, channel_name);
1326 if (ret != LTTNG_OK) {
1327 goto error;
1328 }
1329 break;
1330 }
1331 #if 0
1332 case LTTNG_DOMAIN_UST_EXEC_NAME:
1333 case LTTNG_DOMAIN_UST_PID:
1334 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
1335 #endif
1336 default:
1337 ret = LTTNG_ERR_UND;
1338 goto error;
1339 }
1340
1341 return LTTNG_OK;
1342
1343 error:
1344 if (chan_kern_created) {
1345 struct ltt_kernel_channel *kchan =
1346 trace_kernel_get_channel_by_name(DEFAULT_CHANNEL_NAME,
1347 session->kernel_session);
1348 /* Created previously, this should NOT fail. */
1349 assert(kchan);
1350 kernel_destroy_channel(kchan);
1351 }
1352
1353 if (chan_ust_created) {
1354 struct ltt_ust_channel *uchan =
1355 trace_ust_find_channel_by_name(
1356 session->ust_session->domain_global.channels,
1357 DEFAULT_CHANNEL_NAME);
1358 /* Created previously, this should NOT fail. */
1359 assert(uchan);
1360 /* Remove from the channel list of the session. */
1361 trace_ust_delete_channel(session->ust_session->domain_global.channels,
1362 uchan);
1363 trace_ust_destroy_channel(uchan);
1364 }
1365 return ret;
1366 }
1367
1368 static int validate_event_name(const char *name)
1369 {
1370 int ret = 0;
1371 const char *c = name;
1372 const char *event_name_end = c + LTTNG_SYMBOL_NAME_LEN;
1373
1374 /*
1375 * Make sure that unescaped wildcards are only used as the last
1376 * character of the event name.
1377 */
1378 while (c < event_name_end) {
1379 switch (*c) {
1380 case '\0':
1381 goto end;
1382 case '\\':
1383 c++;
1384 break;
1385 case '*':
1386 if ((c + 1) < event_name_end && *(c + 1)) {
1387 /* Wildcard is not the last character */
1388 ret = LTTNG_ERR_INVALID_EVENT_NAME;
1389 goto end;
1390 }
1391 default:
1392 break;
1393 }
1394 c++;
1395 }
1396 end:
1397 return ret;
1398 }
1399
1400 /*
1401 * Command LTTNG_ENABLE_EVENT processed by the client thread.
1402 * We own filter, exclusion, and filter_expression.
1403 */
1404 int cmd_enable_event(struct ltt_session *session, struct lttng_domain *domain,
1405 char *channel_name, struct lttng_event *event,
1406 char *filter_expression,
1407 struct lttng_filter_bytecode *filter,
1408 struct lttng_event_exclusion *exclusion,
1409 int wpipe)
1410 {
1411 int ret, channel_created = 0;
1412 struct lttng_channel *attr;
1413
1414 assert(session);
1415 assert(event);
1416 assert(channel_name);
1417
1418 DBG("Enable event command for event \'%s\'", event->name);
1419
1420 /* Special handling for kernel domain all events. */
1421 if (domain->type == LTTNG_DOMAIN_KERNEL && !strcmp(event->name, "*")) {
1422 return enable_kevent_all(session, domain, channel_name, event,
1423 filter_expression, filter, wpipe);
1424 }
1425
1426 ret = validate_event_name(event->name);
1427 if (ret) {
1428 goto error;
1429 }
1430
1431 rcu_read_lock();
1432
1433 switch (domain->type) {
1434 case LTTNG_DOMAIN_KERNEL:
1435 {
1436 struct ltt_kernel_channel *kchan;
1437
1438 /*
1439 * If a non-default channel has been created in the
1440 * session, explicitely require that -c chan_name needs
1441 * to be provided.
1442 */
1443 if (session->kernel_session->has_non_default_channel
1444 && channel_name[0] == '\0') {
1445 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
1446 goto error;
1447 }
1448
1449 kchan = trace_kernel_get_channel_by_name(channel_name,
1450 session->kernel_session);
1451 if (kchan == NULL) {
1452 attr = channel_new_default_attr(LTTNG_DOMAIN_KERNEL,
1453 LTTNG_BUFFER_GLOBAL);
1454 if (attr == NULL) {
1455 ret = LTTNG_ERR_FATAL;
1456 goto error;
1457 }
1458 strncpy(attr->name, channel_name, sizeof(attr->name));
1459
1460 ret = cmd_enable_channel(session, domain, attr, wpipe);
1461 if (ret != LTTNG_OK) {
1462 free(attr);
1463 goto error;
1464 }
1465 free(attr);
1466
1467 channel_created = 1;
1468 }
1469
1470 /* Get the newly created kernel channel pointer */
1471 kchan = trace_kernel_get_channel_by_name(channel_name,
1472 session->kernel_session);
1473 if (kchan == NULL) {
1474 /* This sould not happen... */
1475 ret = LTTNG_ERR_FATAL;
1476 goto error;
1477 }
1478
1479 switch (event->type) {
1480 case LTTNG_EVENT_ALL:
1481 case LTTNG_EVENT_PROBE:
1482 case LTTNG_EVENT_FUNCTION:
1483 case LTTNG_EVENT_FUNCTION_ENTRY:
1484 case LTTNG_EVENT_TRACEPOINT:
1485 ret = event_kernel_enable_tracepoint(kchan, event);
1486 if (ret != LTTNG_OK) {
1487 if (channel_created) {
1488 /* Let's not leak a useless channel. */
1489 kernel_destroy_channel(kchan);
1490 }
1491 goto error;
1492 }
1493 break;
1494 case LTTNG_EVENT_SYSCALL:
1495 ret = event_kernel_enable_syscall(kchan, event->name);
1496 if (ret != LTTNG_OK) {
1497 goto error;
1498 }
1499 break;
1500 default:
1501 ret = LTTNG_ERR_UNK;
1502 goto error;
1503 }
1504
1505 kernel_wait_quiescent(kernel_tracer_fd);
1506 break;
1507 }
1508 case LTTNG_DOMAIN_UST:
1509 {
1510 struct ltt_ust_channel *uchan;
1511 struct ltt_ust_session *usess = session->ust_session;
1512
1513 assert(usess);
1514
1515 /*
1516 * If a non-default channel has been created in the
1517 * session, explicitely require that -c chan_name needs
1518 * to be provided.
1519 */
1520 if (usess->has_non_default_channel && channel_name[0] == '\0') {
1521 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
1522 goto error;
1523 }
1524
1525 /* Get channel from global UST domain */
1526 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
1527 channel_name);
1528 if (uchan == NULL) {
1529 /* Create default channel */
1530 attr = channel_new_default_attr(LTTNG_DOMAIN_UST,
1531 usess->buffer_type);
1532 if (attr == NULL) {
1533 ret = LTTNG_ERR_FATAL;
1534 goto error;
1535 }
1536 strncpy(attr->name, channel_name, sizeof(attr->name));
1537
1538 ret = cmd_enable_channel(session, domain, attr, wpipe);
1539 if (ret != LTTNG_OK) {
1540 free(attr);
1541 goto error;
1542 }
1543 free(attr);
1544
1545 /* Get the newly created channel reference back */
1546 uchan = trace_ust_find_channel_by_name(
1547 usess->domain_global.channels, channel_name);
1548 assert(uchan);
1549 }
1550
1551 /* At this point, the session and channel exist on the tracer */
1552 ret = event_ust_enable_tracepoint(usess, uchan, event,
1553 filter_expression, filter, exclusion);
1554 /* We have passed ownership */
1555 filter_expression = NULL;
1556 filter = NULL;
1557 exclusion = NULL;
1558 if (ret != LTTNG_OK) {
1559 goto error;
1560 }
1561 break;
1562 }
1563 case LTTNG_DOMAIN_LOG4J:
1564 case LTTNG_DOMAIN_JUL:
1565 {
1566 const char *default_event_name, *default_chan_name;
1567 struct agent *agt;
1568 struct lttng_event uevent;
1569 struct lttng_domain tmp_dom;
1570 struct ltt_ust_session *usess = session->ust_session;
1571
1572 assert(usess);
1573
1574 agt = trace_ust_find_agent(usess, domain->type);
1575 if (!agt) {
1576 agt = agent_create(domain->type);
1577 if (!agt) {
1578 ret = -LTTNG_ERR_NOMEM;
1579 goto error;
1580 }
1581 agent_add(agt, usess->agents);
1582 }
1583
1584 /* Create the default tracepoint. */
1585 memset(&uevent, 0, sizeof(uevent));
1586 uevent.type = LTTNG_EVENT_TRACEPOINT;
1587 uevent.loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL;
1588 default_event_name = event_get_default_agent_ust_name(domain->type);
1589 if (!default_event_name) {
1590 ret = -LTTNG_ERR_FATAL;
1591 goto error;
1592 }
1593 strncpy(uevent.name, default_event_name, sizeof(uevent.name));
1594 uevent.name[sizeof(uevent.name) - 1] = '\0';
1595
1596 /*
1597 * The domain type is changed because we are about to enable the
1598 * default channel and event for the JUL domain that are hardcoded.
1599 * This happens in the UST domain.
1600 */
1601 memcpy(&tmp_dom, domain, sizeof(tmp_dom));
1602 tmp_dom.type = LTTNG_DOMAIN_UST;
1603
1604 if (domain->type == LTTNG_DOMAIN_LOG4J) {
1605 default_chan_name = DEFAULT_LOG4J_CHANNEL_NAME;
1606 } else {
1607 default_chan_name = DEFAULT_JUL_CHANNEL_NAME;
1608 }
1609
1610 {
1611 struct lttng_filter_bytecode *filter_copy = NULL;
1612
1613 if (filter) {
1614 filter_copy = zmalloc(
1615 sizeof(struct lttng_filter_bytecode)
1616 + filter->len);
1617 if (!filter_copy) {
1618 goto error;
1619 }
1620
1621 memcpy(filter_copy, filter,
1622 sizeof(struct lttng_filter_bytecode)
1623 + filter->len);
1624 }
1625
1626 ret = cmd_enable_event(session, &tmp_dom,
1627 (char *) default_chan_name,
1628 &uevent, filter_expression, filter_copy,
1629 NULL, wpipe);
1630 /* We have passed ownership */
1631 filter_expression = NULL;
1632 }
1633
1634 if (ret != LTTNG_OK && ret != LTTNG_ERR_UST_EVENT_ENABLED) {
1635 goto error;
1636 }
1637
1638 /* The wild card * means that everything should be enabled. */
1639 if (strncmp(event->name, "*", 1) == 0 && strlen(event->name) == 1) {
1640 ret = event_agent_enable_all(usess, agt, event, filter);
1641 filter = NULL;
1642 } else {
1643 ret = event_agent_enable(usess, agt, event, filter);
1644 filter = NULL;
1645 }
1646 if (ret != LTTNG_OK) {
1647 goto error;
1648 }
1649
1650 break;
1651 }
1652 #if 0
1653 case LTTNG_DOMAIN_UST_EXEC_NAME:
1654 case LTTNG_DOMAIN_UST_PID:
1655 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
1656 #endif
1657 default:
1658 ret = LTTNG_ERR_UND;
1659 goto error;
1660 }
1661
1662 ret = LTTNG_OK;
1663
1664 error:
1665 free(filter_expression);
1666 free(filter);
1667 free(exclusion);
1668 rcu_read_unlock();
1669 return ret;
1670 }
1671
1672 /*
1673 * Command LTTNG_ENABLE_EVENT for event "*" processed by the client thread.
1674 */
1675 static
1676 int enable_kevent_all(struct ltt_session *session,
1677 struct lttng_domain *domain, char *channel_name,
1678 struct lttng_event *event,
1679 char *filter_expression,
1680 struct lttng_filter_bytecode *filter, int wpipe)
1681 {
1682 int ret;
1683 struct lttng_channel *attr;
1684
1685 assert(session);
1686 assert(channel_name);
1687
1688 rcu_read_lock();
1689
1690 switch (domain->type) {
1691 case LTTNG_DOMAIN_KERNEL:
1692 {
1693 struct ltt_kernel_channel *kchan;
1694
1695 assert(session->kernel_session);
1696
1697 /*
1698 * If a non-default channel has been created in the
1699 * session, explicitely require that -c chan_name needs
1700 * to be provided.
1701 */
1702 if (session->kernel_session->has_non_default_channel
1703 && channel_name[0] == '\0') {
1704 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
1705 goto error;
1706 }
1707
1708 kchan = trace_kernel_get_channel_by_name(channel_name,
1709 session->kernel_session);
1710 if (kchan == NULL) {
1711 /* Create default channel */
1712 attr = channel_new_default_attr(LTTNG_DOMAIN_KERNEL,
1713 LTTNG_BUFFER_GLOBAL);
1714 if (attr == NULL) {
1715 ret = LTTNG_ERR_FATAL;
1716 goto error;
1717 }
1718 strncpy(attr->name, channel_name, sizeof(attr->name));
1719
1720 ret = cmd_enable_channel(session, domain, attr, wpipe);
1721 if (ret != LTTNG_OK) {
1722 free(attr);
1723 goto error;
1724 }
1725 free(attr);
1726
1727 /* Get the newly created kernel channel pointer */
1728 kchan = trace_kernel_get_channel_by_name(channel_name,
1729 session->kernel_session);
1730 assert(kchan);
1731 }
1732
1733 switch (event->type) {
1734 case LTTNG_EVENT_SYSCALL:
1735 ret = event_kernel_enable_syscall(kchan, "");
1736 if (ret != LTTNG_OK) {
1737 goto error;
1738 }
1739 break;
1740 case LTTNG_EVENT_TRACEPOINT:
1741 /*
1742 * This call enables all LTTNG_KERNEL_TRACEPOINTS and
1743 * events already registered to the channel.
1744 */
1745 ret = event_kernel_enable_all_tracepoints(kchan, kernel_tracer_fd);
1746 break;
1747 case LTTNG_EVENT_ALL:
1748 /* Enable syscalls and tracepoints */
1749 ret = event_kernel_enable_all(kchan, kernel_tracer_fd);
1750 break;
1751 default:
1752 ret = LTTNG_ERR_KERN_ENABLE_FAIL;
1753 goto error;
1754 }
1755
1756 /* Manage return value */
1757 if (ret != LTTNG_OK) {
1758 /*
1759 * On error, cmd_enable_channel call will take care of destroying
1760 * the created channel if it was needed.
1761 */
1762 goto error;
1763 }
1764
1765 kernel_wait_quiescent(kernel_tracer_fd);
1766 break;
1767 }
1768 default:
1769 ret = LTTNG_ERR_UND;
1770 goto error;
1771 }
1772
1773 ret = LTTNG_OK;
1774
1775 error:
1776 rcu_read_unlock();
1777 return ret;
1778 }
1779
1780
1781 /*
1782 * Command LTTNG_LIST_TRACEPOINTS processed by the client thread.
1783 */
1784 ssize_t cmd_list_tracepoints(int domain, struct lttng_event **events)
1785 {
1786 int ret;
1787 ssize_t nb_events = 0;
1788
1789 switch (domain) {
1790 case LTTNG_DOMAIN_KERNEL:
1791 nb_events = kernel_list_events(kernel_tracer_fd, events);
1792 if (nb_events < 0) {
1793 ret = LTTNG_ERR_KERN_LIST_FAIL;
1794 goto error;
1795 }
1796 break;
1797 case LTTNG_DOMAIN_UST:
1798 nb_events = ust_app_list_events(events);
1799 if (nb_events < 0) {
1800 ret = LTTNG_ERR_UST_LIST_FAIL;
1801 goto error;
1802 }
1803 break;
1804 case LTTNG_DOMAIN_LOG4J:
1805 case LTTNG_DOMAIN_JUL:
1806 nb_events = agent_list_events(events, domain);
1807 if (nb_events < 0) {
1808 ret = LTTNG_ERR_UST_LIST_FAIL;
1809 goto error;
1810 }
1811 break;
1812 default:
1813 ret = LTTNG_ERR_UND;
1814 goto error;
1815 }
1816
1817 return nb_events;
1818
1819 error:
1820 /* Return negative value to differentiate return code */
1821 return -ret;
1822 }
1823
1824 /*
1825 * Command LTTNG_LIST_TRACEPOINT_FIELDS processed by the client thread.
1826 */
1827 ssize_t cmd_list_tracepoint_fields(int domain,
1828 struct lttng_event_field **fields)
1829 {
1830 int ret;
1831 ssize_t nb_fields = 0;
1832
1833 switch (domain) {
1834 case LTTNG_DOMAIN_UST:
1835 nb_fields = ust_app_list_event_fields(fields);
1836 if (nb_fields < 0) {
1837 ret = LTTNG_ERR_UST_LIST_FAIL;
1838 goto error;
1839 }
1840 break;
1841 case LTTNG_DOMAIN_KERNEL:
1842 default: /* fall-through */
1843 ret = LTTNG_ERR_UND;
1844 goto error;
1845 }
1846
1847 return nb_fields;
1848
1849 error:
1850 /* Return negative value to differentiate return code */
1851 return -ret;
1852 }
1853
1854 ssize_t cmd_list_syscalls(struct lttng_event **events)
1855 {
1856 return syscall_table_list(events);
1857 }
1858
1859 /*
1860 * Command LTTNG_START_TRACE processed by the client thread.
1861 */
1862 int cmd_start_trace(struct ltt_session *session)
1863 {
1864 int ret;
1865 unsigned long nb_chan = 0;
1866 struct ltt_kernel_session *ksession;
1867 struct ltt_ust_session *usess;
1868
1869 assert(session);
1870
1871 /* Ease our life a bit ;) */
1872 ksession = session->kernel_session;
1873 usess = session->ust_session;
1874
1875 /* Is the session already started? */
1876 if (session->active) {
1877 ret = LTTNG_ERR_TRACE_ALREADY_STARTED;
1878 goto error;
1879 }
1880
1881 /*
1882 * Starting a session without channel is useless since after that it's not
1883 * possible to enable channel thus inform the client.
1884 */
1885 if (usess && usess->domain_global.channels) {
1886 rcu_read_lock();
1887 nb_chan += lttng_ht_get_count(usess->domain_global.channels);
1888 rcu_read_unlock();
1889 }
1890 if (ksession) {
1891 nb_chan += ksession->channel_count;
1892 }
1893 if (!nb_chan) {
1894 ret = LTTNG_ERR_NO_CHANNEL;
1895 goto error;
1896 }
1897
1898 /* Kernel tracing */
1899 if (ksession != NULL) {
1900 ret = start_kernel_session(ksession, kernel_tracer_fd);
1901 if (ret != LTTNG_OK) {
1902 goto error;
1903 }
1904 }
1905
1906 /* Flag session that trace should start automatically */
1907 if (usess) {
1908 /*
1909 * Even though the start trace might fail, flag this session active so
1910 * other application coming in are started by default.
1911 */
1912 usess->active = 1;
1913
1914 ret = ust_app_start_trace_all(usess);
1915 if (ret < 0) {
1916 ret = LTTNG_ERR_UST_START_FAIL;
1917 goto error;
1918 }
1919 }
1920
1921 /* Flag this after a successful start. */
1922 session->has_been_started = 1;
1923 session->active = 1;
1924
1925 ret = LTTNG_OK;
1926
1927 error:
1928 return ret;
1929 }
1930
1931 /*
1932 * Command LTTNG_STOP_TRACE processed by the client thread.
1933 */
1934 int cmd_stop_trace(struct ltt_session *session)
1935 {
1936 int ret;
1937 struct ltt_kernel_channel *kchan;
1938 struct ltt_kernel_session *ksession;
1939 struct ltt_ust_session *usess;
1940
1941 assert(session);
1942
1943 /* Short cut */
1944 ksession = session->kernel_session;
1945 usess = session->ust_session;
1946
1947 /* Session is not active. Skip everythong and inform the client. */
1948 if (!session->active) {
1949 ret = LTTNG_ERR_TRACE_ALREADY_STOPPED;
1950 goto error;
1951 }
1952
1953 /* Kernel tracer */
1954 if (ksession && ksession->active) {
1955 DBG("Stop kernel tracing");
1956
1957 /* Flush metadata if exist */
1958 if (ksession->metadata_stream_fd >= 0) {
1959 ret = kernel_metadata_flush_buffer(ksession->metadata_stream_fd);
1960 if (ret < 0) {
1961 ERR("Kernel metadata flush failed");
1962 }
1963 }
1964
1965 /* Flush all buffers before stopping */
1966 cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
1967 ret = kernel_flush_buffer(kchan);
1968 if (ret < 0) {
1969 ERR("Kernel flush buffer error");
1970 }
1971 }
1972
1973 ret = kernel_stop_session(ksession);
1974 if (ret < 0) {
1975 ret = LTTNG_ERR_KERN_STOP_FAIL;
1976 goto error;
1977 }
1978
1979 kernel_wait_quiescent(kernel_tracer_fd);
1980
1981 ksession->active = 0;
1982 }
1983
1984 if (usess && usess->active) {
1985 /*
1986 * Even though the stop trace might fail, flag this session inactive so
1987 * other application coming in are not started by default.
1988 */
1989 usess->active = 0;
1990
1991 ret = ust_app_stop_trace_all(usess);
1992 if (ret < 0) {
1993 ret = LTTNG_ERR_UST_STOP_FAIL;
1994 goto error;
1995 }
1996 }
1997
1998 /* Flag inactive after a successful stop. */
1999 session->active = 0;
2000 ret = LTTNG_OK;
2001
2002 error:
2003 return ret;
2004 }
2005
2006 /*
2007 * Command LTTNG_SET_CONSUMER_URI processed by the client thread.
2008 */
2009 int cmd_set_consumer_uri(struct ltt_session *session, size_t nb_uri,
2010 struct lttng_uri *uris)
2011 {
2012 int ret, i;
2013 struct ltt_kernel_session *ksess = session->kernel_session;
2014 struct ltt_ust_session *usess = session->ust_session;
2015
2016 assert(session);
2017 assert(uris);
2018 assert(nb_uri > 0);
2019
2020 /* Can't set consumer URI if the session is active. */
2021 if (session->active) {
2022 ret = LTTNG_ERR_TRACE_ALREADY_STARTED;
2023 goto error;
2024 }
2025
2026 /* Set the "global" consumer URIs */
2027 for (i = 0; i < nb_uri; i++) {
2028 ret = add_uri_to_consumer(session->consumer,
2029 &uris[i], 0, session->name);
2030 if (ret != LTTNG_OK) {
2031 goto error;
2032 }
2033 }
2034
2035 /* Set UST session URIs */
2036 if (session->ust_session) {
2037 for (i = 0; i < nb_uri; i++) {
2038 ret = add_uri_to_consumer(
2039 session->ust_session->consumer,
2040 &uris[i], LTTNG_DOMAIN_UST,
2041 session->name);
2042 if (ret != LTTNG_OK) {
2043 goto error;
2044 }
2045 }
2046 }
2047
2048 /* Set kernel session URIs */
2049 if (session->kernel_session) {
2050 for (i = 0; i < nb_uri; i++) {
2051 ret = add_uri_to_consumer(
2052 session->kernel_session->consumer,
2053 &uris[i], LTTNG_DOMAIN_KERNEL,
2054 session->name);
2055 if (ret != LTTNG_OK) {
2056 goto error;
2057 }
2058 }
2059 }
2060
2061 /*
2062 * Make sure to set the session in output mode after we set URI since a
2063 * session can be created without URL (thus flagged in no output mode).
2064 */
2065 session->output_traces = 1;
2066 if (ksess) {
2067 ksess->output_traces = 1;
2068 }
2069
2070 if (usess) {
2071 usess->output_traces = 1;
2072 }
2073
2074 /* All good! */
2075 ret = LTTNG_OK;
2076
2077 error:
2078 return ret;
2079 }
2080
2081 /*
2082 * Command LTTNG_CREATE_SESSION processed by the client thread.
2083 */
2084 int cmd_create_session_uri(char *name, struct lttng_uri *uris,
2085 size_t nb_uri, lttng_sock_cred *creds, unsigned int live_timer)
2086 {
2087 int ret;
2088 struct ltt_session *session;
2089
2090 assert(name);
2091 assert(creds);
2092
2093 /*
2094 * Verify if the session already exist
2095 *
2096 * XXX: There is no need for the session lock list here since the caller
2097 * (process_client_msg) is holding it. We might want to change that so a
2098 * single command does not lock the entire session list.
2099 */
2100 session = session_find_by_name(name);
2101 if (session != NULL) {
2102 ret = LTTNG_ERR_EXIST_SESS;
2103 goto find_error;
2104 }
2105
2106 /* Create tracing session in the registry */
2107 ret = session_create(name, LTTNG_SOCK_GET_UID_CRED(creds),
2108 LTTNG_SOCK_GET_GID_CRED(creds));
2109 if (ret != LTTNG_OK) {
2110 goto session_error;
2111 }
2112
2113 /*
2114 * Get the newly created session pointer back
2115 *
2116 * XXX: There is no need for the session lock list here since the caller
2117 * (process_client_msg) is holding it. We might want to change that so a
2118 * single command does not lock the entire session list.
2119 */
2120 session = session_find_by_name(name);
2121 assert(session);
2122
2123 session->live_timer = live_timer;
2124 /* Create default consumer output for the session not yet created. */
2125 session->consumer = consumer_create_output(CONSUMER_DST_LOCAL);
2126 if (session->consumer == NULL) {
2127 ret = LTTNG_ERR_FATAL;
2128 goto consumer_error;
2129 }
2130
2131 if (uris) {
2132 ret = cmd_set_consumer_uri(session, nb_uri, uris);
2133 if (ret != LTTNG_OK) {
2134 goto consumer_error;
2135 }
2136 session->output_traces = 1;
2137 } else {
2138 session->output_traces = 0;
2139 DBG2("Session %s created with no output", session->name);
2140 }
2141
2142 session->consumer->enabled = 1;
2143
2144 return LTTNG_OK;
2145
2146 consumer_error:
2147 session_destroy(session);
2148 session_error:
2149 find_error:
2150 return ret;
2151 }
2152
2153 /*
2154 * Command LTTNG_CREATE_SESSION_SNAPSHOT processed by the client thread.
2155 */
2156 int cmd_create_session_snapshot(char *name, struct lttng_uri *uris,
2157 size_t nb_uri, lttng_sock_cred *creds)
2158 {
2159 int ret;
2160 struct ltt_session *session;
2161 struct snapshot_output *new_output = NULL;
2162
2163 assert(name);
2164 assert(creds);
2165
2166 /*
2167 * Create session in no output mode with URIs set to NULL. The uris we've
2168 * received are for a default snapshot output if one.
2169 */
2170 ret = cmd_create_session_uri(name, NULL, 0, creds, -1);
2171 if (ret != LTTNG_OK) {
2172 goto error;
2173 }
2174
2175 /* Get the newly created session pointer back. This should NEVER fail. */
2176 session = session_find_by_name(name);
2177 assert(session);
2178
2179 /* Flag session for snapshot mode. */
2180 session->snapshot_mode = 1;
2181
2182 /* Skip snapshot output creation if no URI is given. */
2183 if (nb_uri == 0) {
2184 goto end;
2185 }
2186
2187 new_output = snapshot_output_alloc();
2188 if (!new_output) {
2189 ret = LTTNG_ERR_NOMEM;
2190 goto error_snapshot_alloc;
2191 }
2192
2193 ret = snapshot_output_init_with_uri(DEFAULT_SNAPSHOT_MAX_SIZE, NULL,
2194 uris, nb_uri, session->consumer, new_output, &session->snapshot);
2195 if (ret < 0) {
2196 if (ret == -ENOMEM) {
2197 ret = LTTNG_ERR_NOMEM;
2198 } else {
2199 ret = LTTNG_ERR_INVALID;
2200 }
2201 goto error_snapshot;
2202 }
2203
2204 rcu_read_lock();
2205 snapshot_add_output(&session->snapshot, new_output);
2206 rcu_read_unlock();
2207
2208 end:
2209 return LTTNG_OK;
2210
2211 error_snapshot:
2212 snapshot_output_destroy(new_output);
2213 error_snapshot_alloc:
2214 session_destroy(session);
2215 error:
2216 return ret;
2217 }
2218
2219 /*
2220 * Command LTTNG_DESTROY_SESSION processed by the client thread.
2221 */
2222 int cmd_destroy_session(struct ltt_session *session, int wpipe)
2223 {
2224 int ret;
2225 struct ltt_ust_session *usess;
2226 struct ltt_kernel_session *ksess;
2227
2228 /* Safety net */
2229 assert(session);
2230
2231 usess = session->ust_session;
2232 ksess = session->kernel_session;
2233
2234 /* Clean kernel session teardown */
2235 kernel_destroy_session(ksess);
2236
2237 /* UST session teardown */
2238 if (usess) {
2239 /* Close any relayd session */
2240 consumer_output_send_destroy_relayd(usess->consumer);
2241
2242 /* Destroy every UST application related to this session. */
2243 ret = ust_app_destroy_trace_all(usess);
2244 if (ret) {
2245 ERR("Error in ust_app_destroy_trace_all");
2246 }
2247
2248 /* Clean up the rest. */
2249 trace_ust_destroy_session(usess);
2250 }
2251
2252 /*
2253 * Must notify the kernel thread here to update it's poll set in order to
2254 * remove the channel(s)' fd just destroyed.
2255 */
2256 ret = notify_thread_pipe(wpipe);
2257 if (ret < 0) {
2258 PERROR("write kernel poll pipe");
2259 }
2260
2261 ret = session_destroy(session);
2262
2263 return ret;
2264 }
2265
2266 /*
2267 * Command LTTNG_CALIBRATE processed by the client thread.
2268 */
2269 int cmd_calibrate(int domain, struct lttng_calibrate *calibrate)
2270 {
2271 int ret;
2272
2273 switch (domain) {
2274 case LTTNG_DOMAIN_KERNEL:
2275 {
2276 struct lttng_kernel_calibrate kcalibrate;
2277
2278 switch (calibrate->type) {
2279 case LTTNG_CALIBRATE_FUNCTION:
2280 default:
2281 /* Default and only possible calibrate option. */
2282 kcalibrate.type = LTTNG_KERNEL_CALIBRATE_KRETPROBE;
2283 break;
2284 }
2285
2286 ret = kernel_calibrate(kernel_tracer_fd, &kcalibrate);
2287 if (ret < 0) {
2288 ret = LTTNG_ERR_KERN_ENABLE_FAIL;
2289 goto error;
2290 }
2291 break;
2292 }
2293 case LTTNG_DOMAIN_UST:
2294 {
2295 struct lttng_ust_calibrate ucalibrate;
2296
2297 switch (calibrate->type) {
2298 case LTTNG_CALIBRATE_FUNCTION:
2299 default:
2300 /* Default and only possible calibrate option. */
2301 ucalibrate.type = LTTNG_UST_CALIBRATE_TRACEPOINT;
2302 break;
2303 }
2304
2305 ret = ust_app_calibrate_glb(&ucalibrate);
2306 if (ret < 0) {
2307 ret = LTTNG_ERR_UST_CALIBRATE_FAIL;
2308 goto error;
2309 }
2310 break;
2311 }
2312 default:
2313 ret = LTTNG_ERR_UND;
2314 goto error;
2315 }
2316
2317 ret = LTTNG_OK;
2318
2319 error:
2320 return ret;
2321 }
2322
2323 /*
2324 * Command LTTNG_REGISTER_CONSUMER processed by the client thread.
2325 */
2326 int cmd_register_consumer(struct ltt_session *session, int domain,
2327 const char *sock_path, struct consumer_data *cdata)
2328 {
2329 int ret, sock;
2330 struct consumer_socket *socket = NULL;
2331
2332 assert(session);
2333 assert(cdata);
2334 assert(sock_path);
2335
2336 switch (domain) {
2337 case LTTNG_DOMAIN_KERNEL:
2338 {
2339 struct ltt_kernel_session *ksess = session->kernel_session;
2340
2341 assert(ksess);
2342
2343 /* Can't register a consumer if there is already one */
2344 if (ksess->consumer_fds_sent != 0) {
2345 ret = LTTNG_ERR_KERN_CONSUMER_FAIL;
2346 goto error;
2347 }
2348
2349 sock = lttcomm_connect_unix_sock(sock_path);
2350 if (sock < 0) {
2351 ret = LTTNG_ERR_CONNECT_FAIL;
2352 goto error;
2353 }
2354 cdata->cmd_sock = sock;
2355
2356 socket = consumer_allocate_socket(&cdata->cmd_sock);
2357 if (socket == NULL) {
2358 ret = close(sock);
2359 if (ret < 0) {
2360 PERROR("close register consumer");
2361 }
2362 cdata->cmd_sock = -1;
2363 ret = LTTNG_ERR_FATAL;
2364 goto error;
2365 }
2366
2367 socket->lock = zmalloc(sizeof(pthread_mutex_t));
2368 if (socket->lock == NULL) {
2369 PERROR("zmalloc pthread mutex");
2370 ret = LTTNG_ERR_FATAL;
2371 goto error;
2372 }
2373 pthread_mutex_init(socket->lock, NULL);
2374 socket->registered = 1;
2375
2376 rcu_read_lock();
2377 consumer_add_socket(socket, ksess->consumer);
2378 rcu_read_unlock();
2379
2380 pthread_mutex_lock(&cdata->pid_mutex);
2381 cdata->pid = -1;
2382 pthread_mutex_unlock(&cdata->pid_mutex);
2383
2384 break;
2385 }
2386 default:
2387 /* TODO: Userspace tracing */
2388 ret = LTTNG_ERR_UND;
2389 goto error;
2390 }
2391
2392 return LTTNG_OK;
2393
2394 error:
2395 if (socket) {
2396 consumer_destroy_socket(socket);
2397 }
2398 return ret;
2399 }
2400
2401 /*
2402 * Command LTTNG_LIST_DOMAINS processed by the client thread.
2403 */
2404 ssize_t cmd_list_domains(struct ltt_session *session,
2405 struct lttng_domain **domains)
2406 {
2407 int ret, index = 0;
2408 ssize_t nb_dom = 0;
2409 struct agent *agt;
2410 struct lttng_ht_iter iter;
2411
2412 if (session->kernel_session != NULL) {
2413 DBG3("Listing domains found kernel domain");
2414 nb_dom++;
2415 }
2416
2417 if (session->ust_session != NULL) {
2418 DBG3("Listing domains found UST global domain");
2419 nb_dom++;
2420
2421 rcu_read_lock();
2422 cds_lfht_for_each_entry(session->ust_session->agents->ht, &iter.iter,
2423 agt, node.node) {
2424 if (agt->being_used) {
2425 nb_dom++;
2426 }
2427 }
2428 rcu_read_unlock();
2429 }
2430
2431 *domains = zmalloc(nb_dom * sizeof(struct lttng_domain));
2432 if (*domains == NULL) {
2433 ret = LTTNG_ERR_FATAL;
2434 goto error;
2435 }
2436
2437 if (session->kernel_session != NULL) {
2438 (*domains)[index].type = LTTNG_DOMAIN_KERNEL;
2439 index++;
2440 }
2441
2442 if (session->ust_session != NULL) {
2443 (*domains)[index].type = LTTNG_DOMAIN_UST;
2444 (*domains)[index].buf_type = session->ust_session->buffer_type;
2445 index++;
2446
2447 rcu_read_lock();
2448 cds_lfht_for_each_entry(session->ust_session->agents->ht, &iter.iter,
2449 agt, node.node) {
2450 if (agt->being_used) {
2451 (*domains)[index].type = agt->domain;
2452 (*domains)[index].buf_type = session->ust_session->buffer_type;
2453 index++;
2454 }
2455 }
2456 rcu_read_unlock();
2457 }
2458
2459 return nb_dom;
2460
2461 error:
2462 /* Return negative value to differentiate return code */
2463 return -ret;
2464 }
2465
2466
2467 /*
2468 * Command LTTNG_LIST_CHANNELS processed by the client thread.
2469 */
2470 ssize_t cmd_list_channels(int domain, struct ltt_session *session,
2471 struct lttng_channel **channels)
2472 {
2473 int ret;
2474 ssize_t nb_chan = 0;
2475
2476 switch (domain) {
2477 case LTTNG_DOMAIN_KERNEL:
2478 if (session->kernel_session != NULL) {
2479 nb_chan = session->kernel_session->channel_count;
2480 }
2481 DBG3("Number of kernel channels %zd", nb_chan);
2482 if (nb_chan <= 0) {
2483 ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND;
2484 }
2485 break;
2486 case LTTNG_DOMAIN_UST:
2487 if (session->ust_session != NULL) {
2488 rcu_read_lock();
2489 nb_chan = lttng_ht_get_count(
2490 session->ust_session->domain_global.channels);
2491 rcu_read_unlock();
2492 }
2493 DBG3("Number of UST global channels %zd", nb_chan);
2494 if (nb_chan < 0) {
2495 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
2496 goto error;
2497 }
2498 break;
2499 default:
2500 ret = LTTNG_ERR_UND;
2501 goto error;
2502 }
2503
2504 if (nb_chan > 0) {
2505 *channels = zmalloc(nb_chan * sizeof(struct lttng_channel));
2506 if (*channels == NULL) {
2507 ret = LTTNG_ERR_FATAL;
2508 goto error;
2509 }
2510
2511 list_lttng_channels(domain, session, *channels);
2512 }
2513
2514 return nb_chan;
2515
2516 error:
2517 /* Return negative value to differentiate return code */
2518 return -ret;
2519 }
2520
2521 /*
2522 * Command LTTNG_LIST_EVENTS processed by the client thread.
2523 */
2524 ssize_t cmd_list_events(int domain, struct ltt_session *session,
2525 char *channel_name, struct lttng_event **events)
2526 {
2527 int ret = 0;
2528 ssize_t nb_event = 0;
2529
2530 switch (domain) {
2531 case LTTNG_DOMAIN_KERNEL:
2532 if (session->kernel_session != NULL) {
2533 nb_event = list_lttng_kernel_events(channel_name,
2534 session->kernel_session, events);
2535 }
2536 break;
2537 case LTTNG_DOMAIN_UST:
2538 {
2539 if (session->ust_session != NULL) {
2540 nb_event = list_lttng_ust_global_events(channel_name,
2541 &session->ust_session->domain_global, events);
2542 }
2543 break;
2544 }
2545 case LTTNG_DOMAIN_LOG4J:
2546 case LTTNG_DOMAIN_JUL:
2547 if (session->ust_session) {
2548 struct lttng_ht_iter iter;
2549 struct agent *agt;
2550
2551 rcu_read_lock();
2552 cds_lfht_for_each_entry(session->ust_session->agents->ht,
2553 &iter.iter, agt, node.node) {
2554 nb_event = list_lttng_agent_events(agt, events);
2555 }
2556 rcu_read_unlock();
2557 }
2558 break;
2559 default:
2560 ret = LTTNG_ERR_UND;
2561 goto error;
2562 }
2563
2564 return nb_event;
2565
2566 error:
2567 /* Return negative value to differentiate return code */
2568 return -ret;
2569 }
2570
2571 /*
2572 * Using the session list, filled a lttng_session array to send back to the
2573 * client for session listing.
2574 *
2575 * The session list lock MUST be acquired before calling this function. Use
2576 * session_lock_list() and session_unlock_list().
2577 */
2578 void cmd_list_lttng_sessions(struct lttng_session *sessions, uid_t uid,
2579 gid_t gid)
2580 {
2581 int ret;
2582 unsigned int i = 0;
2583 struct ltt_session *session;
2584 struct ltt_session_list *list = session_get_list();
2585
2586 DBG("Getting all available session for UID %d GID %d",
2587 uid, gid);
2588 /*
2589 * Iterate over session list and append data after the control struct in
2590 * the buffer.
2591 */
2592 cds_list_for_each_entry(session, &list->head, list) {
2593 /*
2594 * Only list the sessions the user can control.
2595 */
2596 if (!session_access_ok(session, uid, gid)) {
2597 continue;
2598 }
2599
2600 struct ltt_kernel_session *ksess = session->kernel_session;
2601 struct ltt_ust_session *usess = session->ust_session;
2602
2603 if (session->consumer->type == CONSUMER_DST_NET ||
2604 (ksess && ksess->consumer->type == CONSUMER_DST_NET) ||
2605 (usess && usess->consumer->type == CONSUMER_DST_NET)) {
2606 ret = build_network_session_path(sessions[i].path,
2607 sizeof(sessions[i].path), session);
2608 } else {
2609 ret = snprintf(sessions[i].path, sizeof(sessions[i].path), "%s",
2610 session->consumer->dst.trace_path);
2611 }
2612 if (ret < 0) {
2613 PERROR("snprintf session path");
2614 continue;
2615 }
2616
2617 strncpy(sessions[i].name, session->name, NAME_MAX);
2618 sessions[i].name[NAME_MAX - 1] = '\0';
2619 sessions[i].enabled = session->active;
2620 sessions[i].snapshot_mode = session->snapshot_mode;
2621 sessions[i].live_timer_interval = session->live_timer;
2622 i++;
2623 }
2624 }
2625
2626 /*
2627 * Command LTTNG_DATA_PENDING returning 0 if the data is NOT pending meaning
2628 * ready for trace analysis (or any kind of reader) or else 1 for pending data.
2629 */
2630 int cmd_data_pending(struct ltt_session *session)
2631 {
2632 int ret;
2633 struct ltt_kernel_session *ksess = session->kernel_session;
2634 struct ltt_ust_session *usess = session->ust_session;
2635
2636 assert(session);
2637
2638 /* Session MUST be stopped to ask for data availability. */
2639 if (session->active) {
2640 ret = LTTNG_ERR_SESSION_STARTED;
2641 goto error;
2642 } else {
2643 /*
2644 * If stopped, just make sure we've started before else the above call
2645 * will always send that there is data pending.
2646 *
2647 * The consumer assumes that when the data pending command is received,
2648 * the trace has been started before or else no output data is written
2649 * by the streams which is a condition for data pending. So, this is
2650 * *VERY* important that we don't ask the consumer before a start
2651 * trace.
2652 */
2653 if (!session->has_been_started) {
2654 ret = 0;
2655 goto error;
2656 }
2657 }
2658
2659 if (ksess && ksess->consumer) {
2660 ret = consumer_is_data_pending(ksess->id, ksess->consumer);
2661 if (ret == 1) {
2662 /* Data is still being extracted for the kernel. */
2663 goto error;
2664 }
2665 }
2666
2667 if (usess && usess->consumer) {
2668 ret = consumer_is_data_pending(usess->id, usess->consumer);
2669 if (ret == 1) {
2670 /* Data is still being extracted for the kernel. */
2671 goto error;
2672 }
2673 }
2674
2675 /* Data is ready to be read by a viewer */
2676 ret = 0;
2677
2678 error:
2679 return ret;
2680 }
2681
2682 /*
2683 * Command LTTNG_SNAPSHOT_ADD_OUTPUT from the lttng ctl library.
2684 *
2685 * Return LTTNG_OK on success or else a LTTNG_ERR code.
2686 */
2687 int cmd_snapshot_add_output(struct ltt_session *session,
2688 struct lttng_snapshot_output *output, uint32_t *id)
2689 {
2690 int ret;
2691 struct snapshot_output *new_output;
2692
2693 assert(session);
2694 assert(output);
2695
2696 DBG("Cmd snapshot add output for session %s", session->name);
2697
2698 /*
2699 * Permission denied to create an output if the session is not
2700 * set in no output mode.
2701 */
2702 if (session->output_traces) {
2703 ret = LTTNG_ERR_EPERM;
2704 goto error;
2705 }
2706
2707 /* Only one output is allowed until we have the "tee" feature. */
2708 if (session->snapshot.nb_output == 1) {
2709 ret = LTTNG_ERR_SNAPSHOT_OUTPUT_EXIST;
2710 goto error;
2711 }
2712
2713 new_output = snapshot_output_alloc();
2714 if (!new_output) {
2715 ret = LTTNG_ERR_NOMEM;
2716 goto error;
2717 }
2718
2719 ret = snapshot_output_init(output->max_size, output->name,
2720 output->ctrl_url, output->data_url, session->consumer, new_output,
2721 &session->snapshot);
2722 if (ret < 0) {
2723 if (ret == -ENOMEM) {
2724 ret = LTTNG_ERR_NOMEM;
2725 } else {
2726 ret = LTTNG_ERR_INVALID;
2727 }
2728 goto free_error;
2729 }
2730
2731 rcu_read_lock();
2732 snapshot_add_output(&session->snapshot, new_output);
2733 if (id) {
2734 *id = new_output->id;
2735 }
2736 rcu_read_unlock();
2737
2738 return LTTNG_OK;
2739
2740 free_error:
2741 snapshot_output_destroy(new_output);
2742 error:
2743 return ret;
2744 }
2745
2746 /*
2747 * Command LTTNG_SNAPSHOT_DEL_OUTPUT from lib lttng ctl.
2748 *
2749 * Return LTTNG_OK on success or else a LTTNG_ERR code.
2750 */
2751 int cmd_snapshot_del_output(struct ltt_session *session,
2752 struct lttng_snapshot_output *output)
2753 {
2754 int ret;
2755 struct snapshot_output *sout = NULL;
2756
2757 assert(session);
2758 assert(output);
2759
2760 rcu_read_lock();
2761
2762 /*
2763 * Permission denied to create an output if the session is not
2764 * set in no output mode.
2765 */
2766 if (session->output_traces) {
2767 ret = LTTNG_ERR_EPERM;
2768 goto error;
2769 }
2770
2771 if (output->id) {
2772 DBG("Cmd snapshot del output id %" PRIu32 " for session %s", output->id,
2773 session->name);
2774 sout = snapshot_find_output_by_id(output->id, &session->snapshot);
2775 } else if (*output->name != '\0') {
2776 DBG("Cmd snapshot del output name %s for session %s", output->name,
2777 session->name);
2778 sout = snapshot_find_output_by_name(output->name, &session->snapshot);
2779 }
2780 if (!sout) {
2781 ret = LTTNG_ERR_INVALID;
2782 goto error;
2783 }
2784
2785 snapshot_delete_output(&session->snapshot, sout);
2786 snapshot_output_destroy(sout);
2787 ret = LTTNG_OK;
2788
2789 error:
2790 rcu_read_unlock();
2791 return ret;
2792 }
2793
2794 /*
2795 * Command LTTNG_SNAPSHOT_LIST_OUTPUT from lib lttng ctl.
2796 *
2797 * If no output is available, outputs is untouched and 0 is returned.
2798 *
2799 * Return the size of the newly allocated outputs or a negative LTTNG_ERR code.
2800 */
2801 ssize_t cmd_snapshot_list_outputs(struct ltt_session *session,
2802 struct lttng_snapshot_output **outputs)
2803 {
2804 int ret, idx = 0;
2805 struct lttng_snapshot_output *list = NULL;
2806 struct lttng_ht_iter iter;
2807 struct snapshot_output *output;
2808
2809 assert(session);
2810 assert(outputs);
2811
2812 DBG("Cmd snapshot list outputs for session %s", session->name);
2813
2814 /*
2815 * Permission denied to create an output if the session is not
2816 * set in no output mode.
2817 */
2818 if (session->output_traces) {
2819 ret = -LTTNG_ERR_EPERM;
2820 goto error;
2821 }
2822
2823 if (session->snapshot.nb_output == 0) {
2824 ret = 0;
2825 goto error;
2826 }
2827
2828 list = zmalloc(session->snapshot.nb_output * sizeof(*list));
2829 if (!list) {
2830 ret = -LTTNG_ERR_NOMEM;
2831 goto error;
2832 }
2833
2834 /* Copy list from session to the new list object. */
2835 rcu_read_lock();
2836 cds_lfht_for_each_entry(session->snapshot.output_ht->ht, &iter.iter,
2837 output, node.node) {
2838 assert(output->consumer);
2839 list[idx].id = output->id;
2840 list[idx].max_size = output->max_size;
2841 strncpy(list[idx].name, output->name, sizeof(list[idx].name));
2842 if (output->consumer->type == CONSUMER_DST_LOCAL) {
2843 strncpy(list[idx].ctrl_url, output->consumer->dst.trace_path,
2844 sizeof(list[idx].ctrl_url));
2845 } else {
2846 /* Control URI. */
2847 ret = uri_to_str_url(&output->consumer->dst.net.control,
2848 list[idx].ctrl_url, sizeof(list[idx].ctrl_url));
2849 if (ret < 0) {
2850 ret = -LTTNG_ERR_NOMEM;
2851 goto error;
2852 }
2853
2854 /* Data URI. */
2855 ret = uri_to_str_url(&output->consumer->dst.net.data,
2856 list[idx].data_url, sizeof(list[idx].data_url));
2857 if (ret < 0) {
2858 ret = -LTTNG_ERR_NOMEM;
2859 goto error;
2860 }
2861 }
2862 idx++;
2863 }
2864
2865 *outputs = list;
2866 list = NULL;
2867 ret = session->snapshot.nb_output;
2868 error:
2869 free(list);
2870 rcu_read_unlock();
2871 return ret;
2872 }
2873
2874 /*
2875 * Send relayd sockets from snapshot output to consumer. Ignore request if the
2876 * snapshot output is *not* set with a remote destination.
2877 *
2878 * Return 0 on success or a LTTNG_ERR code.
2879 */
2880 static int set_relayd_for_snapshot(struct consumer_output *consumer,
2881 struct snapshot_output *snap_output, struct ltt_session *session)
2882 {
2883 int ret = LTTNG_OK;
2884 struct lttng_ht_iter iter;
2885 struct consumer_socket *socket;
2886
2887 assert(consumer);
2888 assert(snap_output);
2889 assert(session);
2890
2891 DBG2("Set relayd object from snapshot output");
2892
2893 /* Ignore if snapshot consumer output is not network. */
2894 if (snap_output->consumer->type != CONSUMER_DST_NET) {
2895 goto error;
2896 }
2897
2898 /*
2899 * For each consumer socket, create and send the relayd object of the
2900 * snapshot output.
2901 */
2902 rcu_read_lock();
2903 cds_lfht_for_each_entry(snap_output->consumer->socks->ht, &iter.iter,
2904 socket, node.node) {
2905 ret = send_consumer_relayd_sockets(0, session->id,
2906 snap_output->consumer, socket,
2907 session->name, session->hostname,
2908 session->live_timer);
2909 if (ret != LTTNG_OK) {
2910 rcu_read_unlock();
2911 goto error;
2912 }
2913 }
2914 rcu_read_unlock();
2915
2916 error:
2917 return ret;
2918 }
2919
2920 /*
2921 * Record a kernel snapshot.
2922 *
2923 * Return LTTNG_OK on success or a LTTNG_ERR code.
2924 */
2925 static int record_kernel_snapshot(struct ltt_kernel_session *ksess,
2926 struct snapshot_output *output, struct ltt_session *session,
2927 int wait, uint64_t max_stream_size)
2928 {
2929 int ret;
2930
2931 assert(ksess);
2932 assert(output);
2933 assert(session);
2934
2935 /* Get the datetime for the snapshot output directory. */
2936 ret = utils_get_current_time_str("%Y%m%d-%H%M%S", output->datetime,
2937 sizeof(output->datetime));
2938 if (!ret) {
2939 ret = LTTNG_ERR_INVALID;
2940 goto error;
2941 }
2942
2943 /*
2944 * Copy kernel session sockets so we can communicate with the right
2945 * consumer for the snapshot record command.
2946 */
2947 ret = consumer_copy_sockets(output->consumer, ksess->consumer);
2948 if (ret < 0) {
2949 ret = LTTNG_ERR_NOMEM;
2950 goto error;
2951 }
2952
2953 ret = set_relayd_for_snapshot(ksess->consumer, output, session);
2954 if (ret != LTTNG_OK) {
2955 goto error_snapshot;
2956 }
2957
2958 ret = kernel_snapshot_record(ksess, output, wait, max_stream_size);
2959 if (ret != LTTNG_OK) {
2960 goto error_snapshot;
2961 }
2962
2963 ret = LTTNG_OK;
2964
2965 error_snapshot:
2966 /* Clean up copied sockets so this output can use some other later on. */
2967 consumer_destroy_output_sockets(output->consumer);
2968 error:
2969 return ret;
2970 }
2971
2972 /*
2973 * Record a UST snapshot.
2974 *
2975 * Return 0 on success or a LTTNG_ERR error code.
2976 */
2977 static int record_ust_snapshot(struct ltt_ust_session *usess,
2978 struct snapshot_output *output, struct ltt_session *session,
2979 int wait, uint64_t max_stream_size)
2980 {
2981 int ret;
2982
2983 assert(usess);
2984 assert(output);
2985 assert(session);
2986
2987 /* Get the datetime for the snapshot output directory. */
2988 ret = utils_get_current_time_str("%Y%m%d-%H%M%S", output->datetime,
2989 sizeof(output->datetime));
2990 if (!ret) {
2991 ret = LTTNG_ERR_INVALID;
2992 goto error;
2993 }
2994
2995 /*
2996 * Copy UST session sockets so we can communicate with the right
2997 * consumer for the snapshot record command.
2998 */
2999 ret = consumer_copy_sockets(output->consumer, usess->consumer);
3000 if (ret < 0) {
3001 ret = LTTNG_ERR_NOMEM;
3002 goto error;
3003 }
3004
3005 ret = set_relayd_for_snapshot(usess->consumer, output, session);
3006 if (ret != LTTNG_OK) {
3007 goto error_snapshot;
3008 }
3009
3010 ret = ust_app_snapshot_record(usess, output, wait, max_stream_size);
3011 if (ret < 0) {
3012 switch (-ret) {
3013 case EINVAL:
3014 ret = LTTNG_ERR_INVALID;
3015 break;
3016 case ENODATA:
3017 ret = LTTNG_ERR_SNAPSHOT_NODATA;
3018 break;
3019 default:
3020 ret = LTTNG_ERR_SNAPSHOT_FAIL;
3021 break;
3022 }
3023 goto error_snapshot;
3024 }
3025
3026 ret = LTTNG_OK;
3027
3028 error_snapshot:
3029 /* Clean up copied sockets so this output can use some other later on. */
3030 consumer_destroy_output_sockets(output->consumer);
3031 error:
3032 return ret;
3033 }
3034
3035 /*
3036 * Return the biggest subbuffer size of all channels in the given session.
3037 */
3038 static uint64_t get_session_max_subbuf_size(struct ltt_session *session)
3039 {
3040 uint64_t max_size = 0;
3041
3042 assert(session);
3043
3044 if (session->kernel_session) {
3045 struct ltt_kernel_channel *chan;
3046 struct ltt_kernel_session *ksess = session->kernel_session;
3047
3048 /*
3049 * For each channel, add to the max size the size of each subbuffer
3050 * multiplied by their sized.
3051 */
3052 cds_list_for_each_entry(chan, &ksess->channel_list.head, list) {
3053 if (chan->channel->attr.subbuf_size > max_size) {
3054 max_size = chan->channel->attr.subbuf_size;
3055 }
3056 }
3057 }
3058
3059 if (session->ust_session) {
3060 struct lttng_ht_iter iter;
3061 struct ltt_ust_channel *uchan;
3062 struct ltt_ust_session *usess = session->ust_session;
3063
3064 rcu_read_lock();
3065 cds_lfht_for_each_entry(usess->domain_global.channels->ht, &iter.iter,
3066 uchan, node.node) {
3067 if (uchan->attr.subbuf_size > max_size) {
3068 max_size = uchan->attr.subbuf_size;
3069 }
3070 }
3071 rcu_read_unlock();
3072 }
3073
3074 return max_size;
3075 }
3076
3077 /*
3078 * Returns the total number of streams for a session or a negative value
3079 * on error.
3080 */
3081 static unsigned int get_session_nb_streams(struct ltt_session *session)
3082 {
3083 unsigned int total_streams = 0;
3084
3085 if (session->kernel_session) {
3086 struct ltt_kernel_session *ksess = session->kernel_session;
3087
3088 total_streams += ksess->stream_count_global;
3089 }
3090
3091 if (session->ust_session) {
3092 struct ltt_ust_session *usess = session->ust_session;
3093
3094 total_streams += ust_app_get_nb_stream(usess);
3095 }
3096
3097 return total_streams;
3098 }
3099
3100 /*
3101 * Command LTTNG_SNAPSHOT_RECORD from lib lttng ctl.
3102 *
3103 * The wait parameter is ignored so this call always wait for the snapshot to
3104 * complete before returning.
3105 *
3106 * Return LTTNG_OK on success or else a LTTNG_ERR code.
3107 */
3108 int cmd_snapshot_record(struct ltt_session *session,
3109 struct lttng_snapshot_output *output, int wait)
3110 {
3111 int ret = LTTNG_OK;
3112 unsigned int use_tmp_output = 0;
3113 struct snapshot_output tmp_output;
3114 unsigned int nb_streams, snapshot_success = 0;
3115 uint64_t session_max_size = 0, max_stream_size = 0;
3116
3117 assert(session);
3118 assert(output);
3119
3120 DBG("Cmd snapshot record for session %s", session->name);
3121
3122 /*
3123 * Permission denied to create an output if the session is not
3124 * set in no output mode.
3125 */
3126 if (session->output_traces) {
3127 ret = LTTNG_ERR_EPERM;
3128 goto error;
3129 }
3130
3131 /* The session needs to be started at least once. */
3132 if (!session->has_been_started) {
3133 ret = LTTNG_ERR_START_SESSION_ONCE;
3134 goto error;
3135 }
3136
3137 /* Use temporary output for the session. */
3138 if (*output->ctrl_url != '\0') {
3139 ret = snapshot_output_init(output->max_size, output->name,
3140 output->ctrl_url, output->data_url, session->consumer,
3141 &tmp_output, NULL);
3142 if (ret < 0) {
3143 if (ret == -ENOMEM) {
3144 ret = LTTNG_ERR_NOMEM;
3145 } else {
3146 ret = LTTNG_ERR_INVALID;
3147 }
3148 goto error;
3149 }
3150 /* Use the global session count for the temporary snapshot. */
3151 tmp_output.nb_snapshot = session->snapshot.nb_snapshot;
3152 use_tmp_output = 1;
3153 }
3154
3155 /*
3156 * Get the session maximum size for a snapshot meaning it will compute the
3157 * size of all streams from all domain.
3158 */
3159 max_stream_size = get_session_max_subbuf_size(session);
3160
3161 nb_streams = get_session_nb_streams(session);
3162 if (nb_streams) {
3163 /*
3164 * The maximum size of the snapshot is the number of streams multiplied
3165 * by the biggest subbuf size of all channels in a session which is the
3166 * maximum stream size available for each stream. The session max size
3167 * is now checked against the snapshot max size value given by the user
3168 * and if lower, an error is returned.
3169 */
3170 session_max_size = max_stream_size * nb_streams;
3171 }
3172
3173 DBG3("Snapshot max size is %" PRIu64 " for max stream size of %" PRIu64,
3174 session_max_size, max_stream_size);
3175
3176 /*
3177 * If we use a temporary output, check right away if the max size fits else
3178 * for each output the max size will be checked.
3179 */
3180 if (use_tmp_output &&
3181 (tmp_output.max_size != 0 &&
3182 tmp_output.max_size < session_max_size)) {
3183 ret = LTTNG_ERR_MAX_SIZE_INVALID;
3184 goto error;
3185 }
3186
3187 if (session->kernel_session) {
3188 struct ltt_kernel_session *ksess = session->kernel_session;
3189
3190 if (use_tmp_output) {
3191 ret = record_kernel_snapshot(ksess, &tmp_output, session,
3192 wait, max_stream_size);
3193 if (ret != LTTNG_OK) {
3194 goto error;
3195 }
3196 snapshot_success = 1;
3197 } else {
3198 struct snapshot_output *sout;
3199 struct lttng_ht_iter iter;
3200
3201 rcu_read_lock();
3202 cds_lfht_for_each_entry(session->snapshot.output_ht->ht,
3203 &iter.iter, sout, node.node) {
3204 /*
3205 * Make a local copy of the output and assign the possible
3206 * temporary value given by the caller.
3207 */
3208 memset(&tmp_output, 0, sizeof(tmp_output));
3209 memcpy(&tmp_output, sout, sizeof(tmp_output));
3210
3211 /* Use temporary max size. */
3212 if (output->max_size != (uint64_t) -1ULL) {
3213 tmp_output.max_size = output->max_size;
3214 }
3215
3216 if (tmp_output.max_size != 0 &&
3217 tmp_output.max_size < session_max_size) {
3218 rcu_read_unlock();
3219 ret = LTTNG_ERR_MAX_SIZE_INVALID;
3220 goto error;
3221 }
3222
3223 /* Use temporary name. */
3224 if (*output->name != '\0') {
3225 strncpy(tmp_output.name, output->name,
3226 sizeof(tmp_output.name));
3227 }
3228
3229 tmp_output.nb_snapshot = session->snapshot.nb_snapshot;
3230
3231 ret = record_kernel_snapshot(ksess, &tmp_output,
3232 session, wait, max_stream_size);
3233 if (ret != LTTNG_OK) {
3234 rcu_read_unlock();
3235 goto error;
3236 }
3237 snapshot_success = 1;
3238 }
3239 rcu_read_unlock();
3240 }
3241 }
3242
3243 if (session->ust_session) {
3244 struct ltt_ust_session *usess = session->ust_session;
3245
3246 if (use_tmp_output) {
3247 ret = record_ust_snapshot(usess, &tmp_output, session,
3248 wait, max_stream_size);
3249 if (ret != LTTNG_OK) {
3250 goto error;
3251 }
3252 snapshot_success = 1;
3253 } else {
3254 struct snapshot_output *sout;
3255 struct lttng_ht_iter iter;
3256
3257 rcu_read_lock();
3258 cds_lfht_for_each_entry(session->snapshot.output_ht->ht,
3259 &iter.iter, sout, node.node) {
3260 /*
3261 * Make a local copy of the output and assign the possible
3262 * temporary value given by the caller.
3263 */
3264 memset(&tmp_output, 0, sizeof(tmp_output));
3265 memcpy(&tmp_output, sout, sizeof(tmp_output));
3266
3267 /* Use temporary max size. */
3268 if (output->max_size != (uint64_t) -1ULL) {
3269 tmp_output.max_size = output->max_size;
3270 }
3271
3272 if (tmp_output.max_size != 0 &&
3273 tmp_output.max_size < session_max_size) {
3274 rcu_read_unlock();
3275 ret = LTTNG_ERR_MAX_SIZE_INVALID;
3276 goto error;
3277 }
3278
3279 /* Use temporary name. */
3280 if (*output->name != '\0') {
3281 strncpy(tmp_output.name, output->name,
3282 sizeof(tmp_output.name));
3283 }
3284
3285 tmp_output.nb_snapshot = session->snapshot.nb_snapshot;
3286
3287 ret = record_ust_snapshot(usess, &tmp_output, session,
3288 wait, max_stream_size);
3289 if (ret != LTTNG_OK) {
3290 rcu_read_unlock();
3291 goto error;
3292 }
3293 snapshot_success = 1;
3294 }
3295 rcu_read_unlock();
3296 }
3297 }
3298
3299 if (snapshot_success) {
3300 session->snapshot.nb_snapshot++;
3301 } else {
3302 ret = LTTNG_ERR_SNAPSHOT_FAIL;
3303 }
3304
3305 error:
3306 return ret;
3307 }
3308
3309 /*
3310 * Init command subsystem.
3311 */
3312 void cmd_init(void)
3313 {
3314 /*
3315 * Set network sequence index to 1 for streams to match a relayd
3316 * socket on the consumer side.
3317 */
3318 pthread_mutex_lock(&relayd_net_seq_idx_lock);
3319 relayd_net_seq_idx = 1;
3320 pthread_mutex_unlock(&relayd_net_seq_idx_lock);
3321
3322 DBG("Command subsystem initialized");
3323 }
LTTng 2.0 tools and control repository
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