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Save filter expressions as part of agent events
[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 #define _LGPL_SOURCE
20 #include <assert.h>
21 #include <string.h>
22 #include <inttypes.h>
23 #include <urcu/list.h>
24 #include <urcu/uatomic.h>
25
26 #include <common/defaults.h>
27 #include <common/common.h>
28 #include <common/sessiond-comm/sessiond-comm.h>
29 #include <common/relayd/relayd.h>
30 #include <common/utils.h>
31
32 #include "channel.h"
33 #include "consumer.h"
34 #include "event.h"
35 #include "health-sessiond.h"
36 #include "kernel.h"
37 #include "kernel-consumer.h"
38 #include "lttng-sessiond.h"
39 #include "utils.h"
40 #include "syscall.h"
41
42 #include "cmd.h"
43
44 /*
45 * Used to keep a unique index for each relayd socket created where this value
46 * is associated with streams on the consumer so it can match the right relayd
47 * to send to. It must be accessed with the relayd_net_seq_idx_lock
48 * held.
49 */
50 static pthread_mutex_t relayd_net_seq_idx_lock = PTHREAD_MUTEX_INITIALIZER;
51 static uint64_t relayd_net_seq_idx;
52
53 static int validate_event_name(const char *);
54 static int validate_ust_event_name(const char *);
55 static int cmd_enable_event_internal(struct ltt_session *session,
56 struct lttng_domain *domain,
57 char *channel_name, struct lttng_event *event,
58 char *filter_expression,
59 struct lttng_filter_bytecode *filter,
60 struct lttng_event_exclusion *exclusion,
61 int wpipe);
62
63 /*
64 * Create a session path used by list_lttng_sessions for the case that the
65 * session consumer is on the network.
66 */
67 static int build_network_session_path(char *dst, size_t size,
68 struct ltt_session *session)
69 {
70 int ret, kdata_port, udata_port;
71 struct lttng_uri *kuri = NULL, *uuri = NULL, *uri = NULL;
72 char tmp_uurl[PATH_MAX], tmp_urls[PATH_MAX];
73
74 assert(session);
75 assert(dst);
76
77 memset(tmp_urls, 0, sizeof(tmp_urls));
78 memset(tmp_uurl, 0, sizeof(tmp_uurl));
79
80 kdata_port = udata_port = DEFAULT_NETWORK_DATA_PORT;
81
82 if (session->kernel_session && session->kernel_session->consumer) {
83 kuri = &session->kernel_session->consumer->dst.net.control;
84 kdata_port = session->kernel_session->consumer->dst.net.data.port;
85 }
86
87 if (session->ust_session && session->ust_session->consumer) {
88 uuri = &session->ust_session->consumer->dst.net.control;
89 udata_port = session->ust_session->consumer->dst.net.data.port;
90 }
91
92 if (uuri == NULL && kuri == NULL) {
93 uri = &session->consumer->dst.net.control;
94 kdata_port = session->consumer->dst.net.data.port;
95 } else if (kuri && uuri) {
96 ret = uri_compare(kuri, uuri);
97 if (ret) {
98 /* Not Equal */
99 uri = kuri;
100 /* Build uuri URL string */
101 ret = uri_to_str_url(uuri, tmp_uurl, sizeof(tmp_uurl));
102 if (ret < 0) {
103 goto error;
104 }
105 } else {
106 uri = kuri;
107 }
108 } else if (kuri && uuri == NULL) {
109 uri = kuri;
110 } else if (uuri && kuri == NULL) {
111 uri = uuri;
112 }
113
114 ret = uri_to_str_url(uri, tmp_urls, sizeof(tmp_urls));
115 if (ret < 0) {
116 goto error;
117 }
118
119 /*
120 * Do we have a UST url set. If yes, this means we have both kernel and UST
121 * to print.
122 */
123 if (*tmp_uurl != '\0') {
124 ret = snprintf(dst, size, "[K]: %s [data: %d] -- [U]: %s [data: %d]",
125 tmp_urls, kdata_port, tmp_uurl, udata_port);
126 } else {
127 int dport;
128 if (kuri || (!kuri && !uuri)) {
129 dport = kdata_port;
130 } else {
131 /* No kernel URI, use the UST port. */
132 dport = udata_port;
133 }
134 ret = snprintf(dst, size, "%s [data: %d]", tmp_urls, dport);
135 }
136
137 error:
138 return ret;
139 }
140
141 /*
142 * Fill lttng_channel array of all channels.
143 */
144 static void list_lttng_channels(int domain, struct ltt_session *session,
145 struct lttng_channel *channels)
146 {
147 int i = 0;
148 struct ltt_kernel_channel *kchan;
149
150 DBG("Listing channels for session %s", session->name);
151
152 switch (domain) {
153 case LTTNG_DOMAIN_KERNEL:
154 /* Kernel channels */
155 if (session->kernel_session != NULL) {
156 cds_list_for_each_entry(kchan,
157 &session->kernel_session->channel_list.head, list) {
158 /* Copy lttng_channel struct to array */
159 memcpy(&channels[i], kchan->channel, sizeof(struct lttng_channel));
160 channels[i].enabled = kchan->enabled;
161 i++;
162 }
163 }
164 break;
165 case LTTNG_DOMAIN_UST:
166 {
167 struct lttng_ht_iter iter;
168 struct ltt_ust_channel *uchan;
169
170 rcu_read_lock();
171 cds_lfht_for_each_entry(session->ust_session->domain_global.channels->ht,
172 &iter.iter, uchan, node.node) {
173 strncpy(channels[i].name, uchan->name, LTTNG_SYMBOL_NAME_LEN);
174 channels[i].attr.overwrite = uchan->attr.overwrite;
175 channels[i].attr.subbuf_size = uchan->attr.subbuf_size;
176 channels[i].attr.num_subbuf = uchan->attr.num_subbuf;
177 channels[i].attr.switch_timer_interval =
178 uchan->attr.switch_timer_interval;
179 channels[i].attr.read_timer_interval =
180 uchan->attr.read_timer_interval;
181 channels[i].enabled = uchan->enabled;
182 channels[i].attr.tracefile_size = uchan->tracefile_size;
183 channels[i].attr.tracefile_count = uchan->tracefile_count;
184 switch (uchan->attr.output) {
185 case LTTNG_UST_MMAP:
186 default:
187 channels[i].attr.output = LTTNG_EVENT_MMAP;
188 break;
189 }
190 i++;
191 }
192 rcu_read_unlock();
193 break;
194 }
195 default:
196 break;
197 }
198 }
199
200 /*
201 * Create a list of agent domain events.
202 *
203 * Return number of events in list on success or else a negative value.
204 */
205 static int list_lttng_agent_events(struct agent *agt,
206 struct lttng_event **events)
207 {
208 int i = 0, ret = 0;
209 unsigned int nb_event = 0;
210 struct agent_event *event;
211 struct lttng_event *tmp_events;
212 struct lttng_ht_iter iter;
213
214 assert(agt);
215 assert(events);
216
217 DBG3("Listing agent events");
218
219 rcu_read_lock();
220 nb_event = lttng_ht_get_count(agt->events);
221 rcu_read_unlock();
222 if (nb_event == 0) {
223 ret = nb_event;
224 goto error;
225 }
226
227 tmp_events = zmalloc(nb_event * sizeof(*tmp_events));
228 if (!tmp_events) {
229 PERROR("zmalloc agent events session");
230 ret = -LTTNG_ERR_FATAL;
231 goto error;
232 }
233
234 rcu_read_lock();
235 cds_lfht_for_each_entry(agt->events->ht, &iter.iter, event, node.node) {
236 strncpy(tmp_events[i].name, event->name, sizeof(tmp_events[i].name));
237 tmp_events[i].name[sizeof(tmp_events[i].name) - 1] = '\0';
238 tmp_events[i].enabled = event->enabled;
239 tmp_events[i].loglevel = event->loglevel;
240 tmp_events[i].loglevel_type = event->loglevel_type;
241 i++;
242 }
243 rcu_read_unlock();
244
245 *events = tmp_events;
246 ret = nb_event;
247
248 error:
249 assert(nb_event == i);
250 return ret;
251 }
252
253 /*
254 * Create a list of ust global domain events.
255 */
256 static int list_lttng_ust_global_events(char *channel_name,
257 struct ltt_ust_domain_global *ust_global, struct lttng_event **events)
258 {
259 int i = 0, ret = 0;
260 unsigned int nb_event = 0;
261 struct lttng_ht_iter iter;
262 struct lttng_ht_node_str *node;
263 struct ltt_ust_channel *uchan;
264 struct ltt_ust_event *uevent;
265 struct lttng_event *tmp;
266
267 DBG("Listing UST global events for channel %s", channel_name);
268
269 rcu_read_lock();
270
271 lttng_ht_lookup(ust_global->channels, (void *)channel_name, &iter);
272 node = lttng_ht_iter_get_node_str(&iter);
273 if (node == NULL) {
274 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
275 goto error;
276 }
277
278 uchan = caa_container_of(&node->node, struct ltt_ust_channel, node.node);
279
280 nb_event = lttng_ht_get_count(uchan->events);
281 if (nb_event == 0) {
282 ret = nb_event;
283 goto error;
284 }
285
286 DBG3("Listing UST global %d events", nb_event);
287
288 tmp = zmalloc(nb_event * sizeof(struct lttng_event));
289 if (tmp == NULL) {
290 ret = LTTNG_ERR_FATAL;
291 goto error;
292 }
293
294 cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) {
295 if (uevent->internal) {
296 /* This event should remain hidden from clients */
297 nb_event--;
298 continue;
299 }
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 default:
915 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
916 goto error;
917 }
918
919 ret = LTTNG_OK;
920
921 error:
922 rcu_read_unlock();
923 return ret;
924 }
925
926 /*
927 * Command LTTNG_TRACK_PID processed by the client thread.
928 *
929 * Called with session lock held.
930 */
931 int cmd_track_pid(struct ltt_session *session, int domain, int pid)
932 {
933 int ret;
934
935 rcu_read_lock();
936
937 switch (domain) {
938 case LTTNG_DOMAIN_KERNEL:
939 {
940 struct ltt_kernel_session *ksess;
941
942 ksess = session->kernel_session;
943
944 ret = kernel_track_pid(ksess, pid);
945 if (ret != LTTNG_OK) {
946 goto error;
947 }
948
949 kernel_wait_quiescent(kernel_tracer_fd);
950 break;
951 }
952 case LTTNG_DOMAIN_UST:
953 {
954 struct ltt_ust_session *usess;
955
956 usess = session->ust_session;
957
958 ret = trace_ust_track_pid(usess, pid);
959 if (ret != LTTNG_OK) {
960 goto error;
961 }
962 break;
963 }
964 default:
965 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
966 goto error;
967 }
968
969 ret = LTTNG_OK;
970
971 error:
972 rcu_read_unlock();
973 return ret;
974 }
975
976 /*
977 * Command LTTNG_UNTRACK_PID processed by the client thread.
978 *
979 * Called with session lock held.
980 */
981 int cmd_untrack_pid(struct ltt_session *session, int domain, int pid)
982 {
983 int ret;
984
985 rcu_read_lock();
986
987 switch (domain) {
988 case LTTNG_DOMAIN_KERNEL:
989 {
990 struct ltt_kernel_session *ksess;
991
992 ksess = session->kernel_session;
993
994 ret = kernel_untrack_pid(ksess, pid);
995 if (ret != LTTNG_OK) {
996 goto error;
997 }
998
999 kernel_wait_quiescent(kernel_tracer_fd);
1000 break;
1001 }
1002 case LTTNG_DOMAIN_UST:
1003 {
1004 struct ltt_ust_session *usess;
1005
1006 usess = session->ust_session;
1007
1008 ret = trace_ust_untrack_pid(usess, pid);
1009 if (ret != LTTNG_OK) {
1010 goto error;
1011 }
1012 break;
1013 }
1014 default:
1015 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
1016 goto error;
1017 }
1018
1019 ret = LTTNG_OK;
1020
1021 error:
1022 rcu_read_unlock();
1023 return ret;
1024 }
1025
1026 /*
1027 * Command LTTNG_ENABLE_CHANNEL processed by the client thread.
1028 *
1029 * The wpipe arguments is used as a notifier for the kernel thread.
1030 */
1031 int cmd_enable_channel(struct ltt_session *session,
1032 struct lttng_domain *domain, struct lttng_channel *attr, int wpipe)
1033 {
1034 int ret;
1035 struct ltt_ust_session *usess = session->ust_session;
1036 struct lttng_ht *chan_ht;
1037 size_t len;
1038
1039 assert(session);
1040 assert(attr);
1041 assert(domain);
1042
1043 len = strnlen(attr->name, sizeof(attr->name));
1044
1045 /* Validate channel name */
1046 if (attr->name[0] == '.' ||
1047 memchr(attr->name, '/', len) != NULL) {
1048 ret = LTTNG_ERR_INVALID_CHANNEL_NAME;
1049 goto end;
1050 }
1051
1052 DBG("Enabling channel %s for session %s", attr->name, session->name);
1053
1054 rcu_read_lock();
1055
1056 /*
1057 * Don't try to enable a channel if the session has been started at
1058 * some point in time before. The tracer does not allow it.
1059 */
1060 if (session->has_been_started) {
1061 ret = LTTNG_ERR_TRACE_ALREADY_STARTED;
1062 goto error;
1063 }
1064
1065 /*
1066 * If the session is a live session, remove the switch timer, the
1067 * live timer does the same thing but sends also synchronisation
1068 * beacons for inactive streams.
1069 */
1070 if (session->live_timer > 0) {
1071 attr->attr.live_timer_interval = session->live_timer;
1072 attr->attr.switch_timer_interval = 0;
1073 }
1074
1075 /*
1076 * The ringbuffer (both in user space and kernel) behave badly in overwrite
1077 * mode and with less than 2 subbuf so block it right away and send back an
1078 * invalid attribute error.
1079 */
1080 if (attr->attr.overwrite && attr->attr.num_subbuf < 2) {
1081 ret = LTTNG_ERR_INVALID;
1082 goto error;
1083 }
1084
1085 switch (domain->type) {
1086 case LTTNG_DOMAIN_KERNEL:
1087 {
1088 struct ltt_kernel_channel *kchan;
1089
1090 kchan = trace_kernel_get_channel_by_name(attr->name,
1091 session->kernel_session);
1092 if (kchan == NULL) {
1093 ret = channel_kernel_create(session->kernel_session, attr, wpipe);
1094 if (attr->name[0] != '\0') {
1095 session->kernel_session->has_non_default_channel = 1;
1096 }
1097 } else {
1098 ret = channel_kernel_enable(session->kernel_session, kchan);
1099 }
1100
1101 if (ret != LTTNG_OK) {
1102 goto error;
1103 }
1104
1105 kernel_wait_quiescent(kernel_tracer_fd);
1106 break;
1107 }
1108 case LTTNG_DOMAIN_UST:
1109 {
1110 struct ltt_ust_channel *uchan;
1111
1112 chan_ht = usess->domain_global.channels;
1113
1114 uchan = trace_ust_find_channel_by_name(chan_ht, attr->name);
1115 if (uchan == NULL) {
1116 ret = channel_ust_create(usess, attr, domain->buf_type);
1117 if (attr->name[0] != '\0') {
1118 usess->has_non_default_channel = 1;
1119 }
1120 } else {
1121 ret = channel_ust_enable(usess, uchan);
1122 }
1123 break;
1124 }
1125 default:
1126 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
1127 goto error;
1128 }
1129
1130 error:
1131 rcu_read_unlock();
1132 end:
1133 return ret;
1134 }
1135
1136 /*
1137 * Command LTTNG_DISABLE_EVENT processed by the client thread.
1138 */
1139 int cmd_disable_event(struct ltt_session *session, int domain,
1140 char *channel_name,
1141 struct lttng_event *event)
1142 {
1143 int ret;
1144 char *event_name;
1145
1146 DBG("Disable event command for event \'%s\'", event->name);
1147
1148 event_name = event->name;
1149 if (validate_event_name(event_name)) {
1150 ret = LTTNG_ERR_INVALID_EVENT_NAME;
1151 goto error;
1152 }
1153
1154 /* Error out on unhandled search criteria */
1155 if (event->loglevel_type || event->loglevel != -1 || event->enabled
1156 || event->pid || event->filter || event->exclusion) {
1157 ret = LTTNG_ERR_UNK;
1158 goto error;
1159 }
1160
1161 rcu_read_lock();
1162
1163 switch (domain) {
1164 case LTTNG_DOMAIN_KERNEL:
1165 {
1166 struct ltt_kernel_channel *kchan;
1167 struct ltt_kernel_session *ksess;
1168
1169 ksess = session->kernel_session;
1170
1171 /*
1172 * If a non-default channel has been created in the
1173 * session, explicitely require that -c chan_name needs
1174 * to be provided.
1175 */
1176 if (ksess->has_non_default_channel && channel_name[0] == '\0') {
1177 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
1178 goto error_unlock;
1179 }
1180
1181 kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
1182 if (kchan == NULL) {
1183 ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND;
1184 goto error_unlock;
1185 }
1186
1187 switch (event->type) {
1188 case LTTNG_EVENT_ALL:
1189 ret = event_kernel_disable_event_all(kchan);
1190 if (ret != LTTNG_OK) {
1191 goto error_unlock;
1192 }
1193 break;
1194 case LTTNG_EVENT_TRACEPOINT: /* fall-through */
1195 case LTTNG_EVENT_SYSCALL:
1196 if (!strcmp(event_name, "*")) {
1197 ret = event_kernel_disable_event_type(kchan,
1198 event->type);
1199 } else {
1200 ret = event_kernel_disable_event(kchan,
1201 event_name);
1202 }
1203 if (ret != LTTNG_OK) {
1204 goto error_unlock;
1205 }
1206 break;
1207 case LTTNG_EVENT_PROBE:
1208 case LTTNG_EVENT_FUNCTION:
1209 case LTTNG_EVENT_FUNCTION_ENTRY:
1210 ret = event_kernel_disable_event(kchan, event_name);
1211 if (ret != LTTNG_OK) {
1212 goto error_unlock;
1213 }
1214 break;
1215 default:
1216 ret = LTTNG_ERR_UNK;
1217 goto error_unlock;
1218 }
1219
1220 kernel_wait_quiescent(kernel_tracer_fd);
1221 break;
1222 }
1223 case LTTNG_DOMAIN_UST:
1224 {
1225 struct ltt_ust_channel *uchan;
1226 struct ltt_ust_session *usess;
1227
1228 usess = session->ust_session;
1229
1230 if (validate_ust_event_name(event_name)) {
1231 ret = LTTNG_ERR_INVALID_EVENT_NAME;
1232 goto error_unlock;
1233 }
1234
1235 /*
1236 * If a non-default channel has been created in the
1237 * session, explicitely require that -c chan_name needs
1238 * to be provided.
1239 */
1240 if (usess->has_non_default_channel && channel_name[0] == '\0') {
1241 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
1242 goto error_unlock;
1243 }
1244
1245 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
1246 channel_name);
1247 if (uchan == NULL) {
1248 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
1249 goto error_unlock;
1250 }
1251
1252 switch (event->type) {
1253 case LTTNG_EVENT_ALL:
1254 ret = event_ust_disable_tracepoint(usess, uchan, event_name);
1255 if (ret != LTTNG_OK) {
1256 goto error_unlock;
1257 }
1258 break;
1259 default:
1260 ret = LTTNG_ERR_UNK;
1261 goto error_unlock;
1262 }
1263
1264 DBG3("Disable UST event %s in channel %s completed", event_name,
1265 channel_name);
1266 break;
1267 }
1268 case LTTNG_DOMAIN_LOG4J:
1269 case LTTNG_DOMAIN_JUL:
1270 case LTTNG_DOMAIN_PYTHON:
1271 {
1272 struct agent *agt;
1273 struct ltt_ust_session *usess = session->ust_session;
1274
1275 assert(usess);
1276
1277 switch (event->type) {
1278 case LTTNG_EVENT_ALL:
1279 break;
1280 default:
1281 ret = LTTNG_ERR_UNK;
1282 goto error_unlock;
1283 }
1284
1285 agt = trace_ust_find_agent(usess, domain);
1286 if (!agt) {
1287 ret = -LTTNG_ERR_UST_EVENT_NOT_FOUND;
1288 goto error_unlock;
1289 }
1290 /* The wild card * means that everything should be disabled. */
1291 if (strncmp(event->name, "*", 1) == 0 && strlen(event->name) == 1) {
1292 ret = event_agent_disable_all(usess, agt);
1293 } else {
1294 ret = event_agent_disable(usess, agt, event_name);
1295 }
1296 if (ret != LTTNG_OK) {
1297 goto error_unlock;
1298 }
1299
1300 break;
1301 }
1302 default:
1303 ret = LTTNG_ERR_UND;
1304 goto error_unlock;
1305 }
1306
1307 ret = LTTNG_OK;
1308
1309 error_unlock:
1310 rcu_read_unlock();
1311 error:
1312 return ret;
1313 }
1314
1315 /*
1316 * Command LTTNG_ADD_CONTEXT processed by the client thread.
1317 */
1318 int cmd_add_context(struct ltt_session *session, int domain,
1319 char *channel_name, struct lttng_event_context *ctx, int kwpipe)
1320 {
1321 int ret, chan_kern_created = 0, chan_ust_created = 0;
1322
1323 switch (domain) {
1324 case LTTNG_DOMAIN_KERNEL:
1325 assert(session->kernel_session);
1326
1327 if (session->kernel_session->channel_count == 0) {
1328 /* Create default channel */
1329 ret = channel_kernel_create(session->kernel_session, NULL, kwpipe);
1330 if (ret != LTTNG_OK) {
1331 goto error;
1332 }
1333 chan_kern_created = 1;
1334 }
1335 /* Add kernel context to kernel tracer */
1336 ret = context_kernel_add(session->kernel_session, ctx, channel_name);
1337 if (ret != LTTNG_OK) {
1338 goto error;
1339 }
1340 break;
1341 case LTTNG_DOMAIN_UST:
1342 {
1343 struct ltt_ust_session *usess = session->ust_session;
1344 unsigned int chan_count;
1345
1346 assert(usess);
1347
1348 chan_count = lttng_ht_get_count(usess->domain_global.channels);
1349 if (chan_count == 0) {
1350 struct lttng_channel *attr;
1351 /* Create default channel */
1352 attr = channel_new_default_attr(domain, usess->buffer_type);
1353 if (attr == NULL) {
1354 ret = LTTNG_ERR_FATAL;
1355 goto error;
1356 }
1357
1358 ret = channel_ust_create(usess, attr, usess->buffer_type);
1359 if (ret != LTTNG_OK) {
1360 free(attr);
1361 goto error;
1362 }
1363 free(attr);
1364 chan_ust_created = 1;
1365 }
1366
1367 ret = context_ust_add(usess, domain, ctx, channel_name);
1368 if (ret != LTTNG_OK) {
1369 goto error;
1370 }
1371 break;
1372 }
1373 default:
1374 ret = LTTNG_ERR_UND;
1375 goto error;
1376 }
1377
1378 return LTTNG_OK;
1379
1380 error:
1381 if (chan_kern_created) {
1382 struct ltt_kernel_channel *kchan =
1383 trace_kernel_get_channel_by_name(DEFAULT_CHANNEL_NAME,
1384 session->kernel_session);
1385 /* Created previously, this should NOT fail. */
1386 assert(kchan);
1387 kernel_destroy_channel(kchan);
1388 }
1389
1390 if (chan_ust_created) {
1391 struct ltt_ust_channel *uchan =
1392 trace_ust_find_channel_by_name(
1393 session->ust_session->domain_global.channels,
1394 DEFAULT_CHANNEL_NAME);
1395 /* Created previously, this should NOT fail. */
1396 assert(uchan);
1397 /* Remove from the channel list of the session. */
1398 trace_ust_delete_channel(session->ust_session->domain_global.channels,
1399 uchan);
1400 trace_ust_destroy_channel(uchan);
1401 }
1402 return ret;
1403 }
1404
1405 static int validate_event_name(const char *name)
1406 {
1407 int ret = 0;
1408 const char *c = name;
1409 const char *event_name_end = c + LTTNG_SYMBOL_NAME_LEN;
1410
1411 /*
1412 * Make sure that unescaped wildcards are only used as the last
1413 * character of the event name.
1414 */
1415 while (c < event_name_end) {
1416 switch (*c) {
1417 case '\0':
1418 goto end;
1419 case '\\':
1420 c++;
1421 break;
1422 case '*':
1423 if ((c + 1) < event_name_end && *(c + 1)) {
1424 /* Wildcard is not the last character */
1425 ret = LTTNG_ERR_INVALID_EVENT_NAME;
1426 goto end;
1427 }
1428 default:
1429 break;
1430 }
1431 c++;
1432 }
1433 end:
1434 return ret;
1435 }
1436
1437 static inline bool name_starts_with(const char *name, const char *prefix)
1438 {
1439 const size_t max_cmp_len = min(strlen(prefix), LTTNG_SYMBOL_NAME_LEN);
1440
1441 return !strncmp(name, prefix, max_cmp_len);
1442 }
1443
1444 /* Perform userspace-specific event name validation */
1445 static int validate_ust_event_name(const char *name)
1446 {
1447 int ret = 0;
1448
1449 if (!name) {
1450 ret = -1;
1451 goto end;
1452 }
1453
1454 /*
1455 * Check name against all internal UST event component namespaces used
1456 * by the agents.
1457 */
1458 if (name_starts_with(name, DEFAULT_JUL_EVENT_COMPONENT) ||
1459 name_starts_with(name, DEFAULT_LOG4J_EVENT_COMPONENT) ||
1460 name_starts_with(name, DEFAULT_PYTHON_EVENT_COMPONENT)) {
1461 ret = -1;
1462 }
1463
1464 end:
1465 return ret;
1466 }
1467
1468 /*
1469 * Internal version of cmd_enable_event() with a supplemental
1470 * "internal_event" flag which is used to enable internal events which should
1471 * be hidden from clients. Such events are used in the agent implementation to
1472 * enable the events through which all "agent" events are funeled.
1473 */
1474 static int _cmd_enable_event(struct ltt_session *session,
1475 struct lttng_domain *domain,
1476 char *channel_name, struct lttng_event *event,
1477 char *filter_expression,
1478 struct lttng_filter_bytecode *filter,
1479 struct lttng_event_exclusion *exclusion,
1480 int wpipe, bool internal_event)
1481 {
1482 int ret, channel_created = 0;
1483 struct lttng_channel *attr;
1484
1485 assert(session);
1486 assert(event);
1487 assert(channel_name);
1488
1489 DBG("Enable event command for event \'%s\'", event->name);
1490
1491 ret = validate_event_name(event->name);
1492 if (ret) {
1493 goto error;
1494 }
1495
1496 rcu_read_lock();
1497
1498 switch (domain->type) {
1499 case LTTNG_DOMAIN_KERNEL:
1500 {
1501 struct ltt_kernel_channel *kchan;
1502
1503 /*
1504 * If a non-default channel has been created in the
1505 * session, explicitely require that -c chan_name needs
1506 * to be provided.
1507 */
1508 if (session->kernel_session->has_non_default_channel
1509 && channel_name[0] == '\0') {
1510 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
1511 goto error;
1512 }
1513
1514 kchan = trace_kernel_get_channel_by_name(channel_name,
1515 session->kernel_session);
1516 if (kchan == NULL) {
1517 attr = channel_new_default_attr(LTTNG_DOMAIN_KERNEL,
1518 LTTNG_BUFFER_GLOBAL);
1519 if (attr == NULL) {
1520 ret = LTTNG_ERR_FATAL;
1521 goto error;
1522 }
1523 strncpy(attr->name, channel_name, sizeof(attr->name));
1524
1525 ret = cmd_enable_channel(session, domain, attr, wpipe);
1526 if (ret != LTTNG_OK) {
1527 free(attr);
1528 goto error;
1529 }
1530 free(attr);
1531
1532 channel_created = 1;
1533 }
1534
1535 /* Get the newly created kernel channel pointer */
1536 kchan = trace_kernel_get_channel_by_name(channel_name,
1537 session->kernel_session);
1538 if (kchan == NULL) {
1539 /* This sould not happen... */
1540 ret = LTTNG_ERR_FATAL;
1541 goto error;
1542 }
1543
1544 switch (event->type) {
1545 case LTTNG_EVENT_ALL:
1546 {
1547 char *filter_expression_a = NULL;
1548 struct lttng_filter_bytecode *filter_a = NULL;
1549
1550 /*
1551 * We need to duplicate filter_expression and filter,
1552 * because ownership is passed to first enable
1553 * event.
1554 */
1555 if (filter_expression) {
1556 filter_expression_a = strdup(filter_expression);
1557 if (!filter_expression_a) {
1558 ret = LTTNG_ERR_FATAL;
1559 goto error;
1560 }
1561 }
1562 if (filter) {
1563 filter_a = zmalloc(sizeof(*filter_a) + filter->len);
1564 if (!filter_a) {
1565 free(filter_expression_a);
1566 ret = LTTNG_ERR_FATAL;
1567 goto error;
1568 }
1569 memcpy(filter_a, filter, sizeof(*filter_a) + filter->len);
1570 }
1571 event->type = LTTNG_EVENT_TRACEPOINT; /* Hack */
1572 ret = event_kernel_enable_event(kchan, event,
1573 filter_expression, filter);
1574 /* We have passed ownership */
1575 filter_expression = NULL;
1576 filter = NULL;
1577 if (ret != LTTNG_OK) {
1578 if (channel_created) {
1579 /* Let's not leak a useless channel. */
1580 kernel_destroy_channel(kchan);
1581 }
1582 free(filter_expression_a);
1583 free(filter_a);
1584 goto error;
1585 }
1586 event->type = LTTNG_EVENT_SYSCALL; /* Hack */
1587 ret = event_kernel_enable_event(kchan, event,
1588 filter_expression_a, filter_a);
1589 if (ret != LTTNG_OK) {
1590 free(filter_expression_a);
1591 free(filter_a);
1592 goto error;
1593 }
1594 break;
1595 }
1596 case LTTNG_EVENT_PROBE:
1597 case LTTNG_EVENT_FUNCTION:
1598 case LTTNG_EVENT_FUNCTION_ENTRY:
1599 case LTTNG_EVENT_TRACEPOINT:
1600 ret = event_kernel_enable_event(kchan, event,
1601 filter_expression, filter);
1602 /* We have passed ownership */
1603 filter_expression = NULL;
1604 filter = NULL;
1605 if (ret != LTTNG_OK) {
1606 if (channel_created) {
1607 /* Let's not leak a useless channel. */
1608 kernel_destroy_channel(kchan);
1609 }
1610 goto error;
1611 }
1612 break;
1613 case LTTNG_EVENT_SYSCALL:
1614 ret = event_kernel_enable_event(kchan, event,
1615 filter_expression, filter);
1616 /* We have passed ownership */
1617 filter_expression = NULL;
1618 filter = NULL;
1619 if (ret != LTTNG_OK) {
1620 goto error;
1621 }
1622 break;
1623 default:
1624 ret = LTTNG_ERR_UNK;
1625 goto error;
1626 }
1627
1628 kernel_wait_quiescent(kernel_tracer_fd);
1629 break;
1630 }
1631 case LTTNG_DOMAIN_UST:
1632 {
1633 struct ltt_ust_channel *uchan;
1634 struct ltt_ust_session *usess = session->ust_session;
1635
1636 assert(usess);
1637
1638 /*
1639 * If a non-default channel has been created in the
1640 * session, explicitely require that -c chan_name needs
1641 * to be provided.
1642 */
1643 if (usess->has_non_default_channel && channel_name[0] == '\0') {
1644 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
1645 goto error;
1646 }
1647
1648 /* Get channel from global UST domain */
1649 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
1650 channel_name);
1651 if (uchan == NULL) {
1652 /* Create default channel */
1653 attr = channel_new_default_attr(LTTNG_DOMAIN_UST,
1654 usess->buffer_type);
1655 if (attr == NULL) {
1656 ret = LTTNG_ERR_FATAL;
1657 goto error;
1658 }
1659 strncpy(attr->name, channel_name, sizeof(attr->name));
1660
1661 ret = cmd_enable_channel(session, domain, attr, wpipe);
1662 if (ret != LTTNG_OK) {
1663 free(attr);
1664 goto error;
1665 }
1666 free(attr);
1667
1668 /* Get the newly created channel reference back */
1669 uchan = trace_ust_find_channel_by_name(
1670 usess->domain_global.channels, channel_name);
1671 assert(uchan);
1672 }
1673
1674 if (!internal_event) {
1675 /*
1676 * Ensure the event name is not reserved for internal
1677 * use.
1678 */
1679 ret = validate_ust_event_name(event->name);
1680 if (ret) {
1681 WARN("Userspace event name %s failed validation.",
1682 event->name ?
1683 event->name : "NULL");
1684 ret = LTTNG_ERR_INVALID_EVENT_NAME;
1685 goto error;
1686 }
1687 }
1688
1689 /* At this point, the session and channel exist on the tracer */
1690 ret = event_ust_enable_tracepoint(usess, uchan, event,
1691 filter_expression, filter, exclusion,
1692 internal_event);
1693 /* We have passed ownership */
1694 filter_expression = NULL;
1695 filter = NULL;
1696 exclusion = NULL;
1697 if (ret != LTTNG_OK) {
1698 goto error;
1699 }
1700 break;
1701 }
1702 case LTTNG_DOMAIN_LOG4J:
1703 case LTTNG_DOMAIN_JUL:
1704 case LTTNG_DOMAIN_PYTHON:
1705 {
1706 const char *default_event_name, *default_chan_name;
1707 struct agent *agt;
1708 struct lttng_event uevent;
1709 struct lttng_domain tmp_dom;
1710 struct ltt_ust_session *usess = session->ust_session;
1711
1712 assert(usess);
1713
1714 agt = trace_ust_find_agent(usess, domain->type);
1715 if (!agt) {
1716 agt = agent_create(domain->type);
1717 if (!agt) {
1718 ret = -LTTNG_ERR_NOMEM;
1719 goto error;
1720 }
1721 agent_add(agt, usess->agents);
1722 }
1723
1724 /* Create the default tracepoint. */
1725 memset(&uevent, 0, sizeof(uevent));
1726 uevent.type = LTTNG_EVENT_TRACEPOINT;
1727 uevent.loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL;
1728 default_event_name = event_get_default_agent_ust_name(domain->type);
1729 if (!default_event_name) {
1730 ret = -LTTNG_ERR_FATAL;
1731 goto error;
1732 }
1733 strncpy(uevent.name, default_event_name, sizeof(uevent.name));
1734 uevent.name[sizeof(uevent.name) - 1] = '\0';
1735
1736 /*
1737 * The domain type is changed because we are about to enable the
1738 * default channel and event for the JUL domain that are hardcoded.
1739 * This happens in the UST domain.
1740 */
1741 memcpy(&tmp_dom, domain, sizeof(tmp_dom));
1742 tmp_dom.type = LTTNG_DOMAIN_UST;
1743
1744 switch (domain->type) {
1745 case LTTNG_DOMAIN_LOG4J:
1746 default_chan_name = DEFAULT_LOG4J_CHANNEL_NAME;
1747 break;
1748 case LTTNG_DOMAIN_JUL:
1749 default_chan_name = DEFAULT_JUL_CHANNEL_NAME;
1750 break;
1751 case LTTNG_DOMAIN_PYTHON:
1752 default_chan_name = DEFAULT_PYTHON_CHANNEL_NAME;
1753 break;
1754 default:
1755 /* The switch/case we are in should avoid this else big problem */
1756 assert(0);
1757 }
1758
1759 {
1760 struct lttng_filter_bytecode *filter_copy = NULL;
1761 char *filter_expression_copy = NULL;
1762
1763 if (filter) {
1764 filter_copy = zmalloc(
1765 sizeof(struct lttng_filter_bytecode)
1766 + filter->len);
1767 if (!filter_copy) {
1768 goto error;
1769 }
1770
1771 memcpy(filter_copy, filter,
1772 sizeof(struct lttng_filter_bytecode)
1773 + filter->len);
1774 }
1775
1776 if (filter_expression) {
1777 filter_expression_copy =
1778 strdup(filter_expression);
1779 if (!filter_expression) {
1780 ret = LTTNG_ERR_NOMEM;
1781 goto error_free_copy;
1782 }
1783 }
1784
1785 ret = cmd_enable_event_internal(session, &tmp_dom,
1786 (char *) default_chan_name,
1787 &uevent, filter_expression_copy,
1788 filter_copy, NULL, wpipe);
1789 filter_copy = NULL;
1790 filter_expression_copy = NULL;
1791 error_free_copy:
1792 free(filter_copy);
1793 free(filter_expression_copy);
1794 }
1795
1796 if (ret != LTTNG_OK && ret != LTTNG_ERR_UST_EVENT_ENABLED) {
1797 goto error;
1798 }
1799
1800 /* The wild card * means that everything should be enabled. */
1801 if (strncmp(event->name, "*", 1) == 0 && strlen(event->name) == 1) {
1802 ret = event_agent_enable_all(usess, agt, event, filter,
1803 filter_expression);
1804 filter = NULL;
1805 } else {
1806 ret = event_agent_enable(usess, agt, event, filter,
1807 filter_expression);
1808 filter = NULL;
1809 }
1810 if (ret != LTTNG_OK) {
1811 goto error;
1812 }
1813
1814 break;
1815 }
1816 default:
1817 ret = LTTNG_ERR_UND;
1818 goto error;
1819 }
1820
1821 ret = LTTNG_OK;
1822
1823 error:
1824 free(filter_expression);
1825 free(filter);
1826 free(exclusion);
1827 rcu_read_unlock();
1828 return ret;
1829 }
1830
1831 /*
1832 * Command LTTNG_ENABLE_EVENT processed by the client thread.
1833 * We own filter, exclusion, and filter_expression.
1834 */
1835 int cmd_enable_event(struct ltt_session *session, struct lttng_domain *domain,
1836 char *channel_name, struct lttng_event *event,
1837 char *filter_expression,
1838 struct lttng_filter_bytecode *filter,
1839 struct lttng_event_exclusion *exclusion,
1840 int wpipe)
1841 {
1842 return _cmd_enable_event(session, domain, channel_name, event,
1843 filter_expression, filter, exclusion, wpipe, false);
1844 }
1845
1846 /*
1847 * Enable an event which is internal to LTTng. An internal should
1848 * never be made visible to clients and are immune to checks such as
1849 * reserved names.
1850 */
1851 static int cmd_enable_event_internal(struct ltt_session *session,
1852 struct lttng_domain *domain,
1853 char *channel_name, struct lttng_event *event,
1854 char *filter_expression,
1855 struct lttng_filter_bytecode *filter,
1856 struct lttng_event_exclusion *exclusion,
1857 int wpipe)
1858 {
1859 return _cmd_enable_event(session, domain, channel_name, event,
1860 filter_expression, filter, exclusion, wpipe, true);
1861 }
1862
1863 /*
1864 * Command LTTNG_LIST_TRACEPOINTS processed by the client thread.
1865 */
1866 ssize_t cmd_list_tracepoints(int domain, struct lttng_event **events)
1867 {
1868 int ret;
1869 ssize_t nb_events = 0;
1870
1871 switch (domain) {
1872 case LTTNG_DOMAIN_KERNEL:
1873 nb_events = kernel_list_events(kernel_tracer_fd, events);
1874 if (nb_events < 0) {
1875 ret = LTTNG_ERR_KERN_LIST_FAIL;
1876 goto error;
1877 }
1878 break;
1879 case LTTNG_DOMAIN_UST:
1880 nb_events = ust_app_list_events(events);
1881 if (nb_events < 0) {
1882 ret = LTTNG_ERR_UST_LIST_FAIL;
1883 goto error;
1884 }
1885 break;
1886 case LTTNG_DOMAIN_LOG4J:
1887 case LTTNG_DOMAIN_JUL:
1888 case LTTNG_DOMAIN_PYTHON:
1889 nb_events = agent_list_events(events, domain);
1890 if (nb_events < 0) {
1891 ret = LTTNG_ERR_UST_LIST_FAIL;
1892 goto error;
1893 }
1894 break;
1895 default:
1896 ret = LTTNG_ERR_UND;
1897 goto error;
1898 }
1899
1900 return nb_events;
1901
1902 error:
1903 /* Return negative value to differentiate return code */
1904 return -ret;
1905 }
1906
1907 /*
1908 * Command LTTNG_LIST_TRACEPOINT_FIELDS processed by the client thread.
1909 */
1910 ssize_t cmd_list_tracepoint_fields(int domain,
1911 struct lttng_event_field **fields)
1912 {
1913 int ret;
1914 ssize_t nb_fields = 0;
1915
1916 switch (domain) {
1917 case LTTNG_DOMAIN_UST:
1918 nb_fields = ust_app_list_event_fields(fields);
1919 if (nb_fields < 0) {
1920 ret = LTTNG_ERR_UST_LIST_FAIL;
1921 goto error;
1922 }
1923 break;
1924 case LTTNG_DOMAIN_KERNEL:
1925 default: /* fall-through */
1926 ret = LTTNG_ERR_UND;
1927 goto error;
1928 }
1929
1930 return nb_fields;
1931
1932 error:
1933 /* Return negative value to differentiate return code */
1934 return -ret;
1935 }
1936
1937 ssize_t cmd_list_syscalls(struct lttng_event **events)
1938 {
1939 return syscall_table_list(events);
1940 }
1941
1942 /*
1943 * Command LTTNG_LIST_TRACKER_PIDS processed by the client thread.
1944 *
1945 * Called with session lock held.
1946 */
1947 ssize_t cmd_list_tracker_pids(struct ltt_session *session,
1948 int domain, int32_t **pids)
1949 {
1950 int ret;
1951 ssize_t nr_pids = 0;
1952
1953 switch (domain) {
1954 case LTTNG_DOMAIN_KERNEL:
1955 {
1956 struct ltt_kernel_session *ksess;
1957
1958 ksess = session->kernel_session;
1959 nr_pids = kernel_list_tracker_pids(ksess, pids);
1960 if (nr_pids < 0) {
1961 ret = LTTNG_ERR_KERN_LIST_FAIL;
1962 goto error;
1963 }
1964 break;
1965 }
1966 case LTTNG_DOMAIN_UST:
1967 {
1968 struct ltt_ust_session *usess;
1969
1970 usess = session->ust_session;
1971 nr_pids = trace_ust_list_tracker_pids(usess, pids);
1972 if (nr_pids < 0) {
1973 ret = LTTNG_ERR_UST_LIST_FAIL;
1974 goto error;
1975 }
1976 break;
1977 }
1978 case LTTNG_DOMAIN_LOG4J:
1979 case LTTNG_DOMAIN_JUL:
1980 case LTTNG_DOMAIN_PYTHON:
1981 default:
1982 ret = LTTNG_ERR_UND;
1983 goto error;
1984 }
1985
1986 return nr_pids;
1987
1988 error:
1989 /* Return negative value to differentiate return code */
1990 return -ret;
1991 }
1992
1993 /*
1994 * Command LTTNG_START_TRACE processed by the client thread.
1995 *
1996 * Called with session mutex held.
1997 */
1998 int cmd_start_trace(struct ltt_session *session)
1999 {
2000 int ret;
2001 unsigned long nb_chan = 0;
2002 struct ltt_kernel_session *ksession;
2003 struct ltt_ust_session *usess;
2004
2005 assert(session);
2006
2007 /* Ease our life a bit ;) */
2008 ksession = session->kernel_session;
2009 usess = session->ust_session;
2010
2011 /* Is the session already started? */
2012 if (session->active) {
2013 ret = LTTNG_ERR_TRACE_ALREADY_STARTED;
2014 goto error;
2015 }
2016
2017 /*
2018 * Starting a session without channel is useless since after that it's not
2019 * possible to enable channel thus inform the client.
2020 */
2021 if (usess && usess->domain_global.channels) {
2022 rcu_read_lock();
2023 nb_chan += lttng_ht_get_count(usess->domain_global.channels);
2024 rcu_read_unlock();
2025 }
2026 if (ksession) {
2027 nb_chan += ksession->channel_count;
2028 }
2029 if (!nb_chan) {
2030 ret = LTTNG_ERR_NO_CHANNEL;
2031 goto error;
2032 }
2033
2034 /* Kernel tracing */
2035 if (ksession != NULL) {
2036 ret = start_kernel_session(ksession, kernel_tracer_fd);
2037 if (ret != LTTNG_OK) {
2038 goto error;
2039 }
2040 }
2041
2042 /* Flag session that trace should start automatically */
2043 if (usess) {
2044 /*
2045 * Even though the start trace might fail, flag this session active so
2046 * other application coming in are started by default.
2047 */
2048 usess->active = 1;
2049
2050 ret = ust_app_start_trace_all(usess);
2051 if (ret < 0) {
2052 ret = LTTNG_ERR_UST_START_FAIL;
2053 goto error;
2054 }
2055 }
2056
2057 /* Flag this after a successful start. */
2058 session->has_been_started = 1;
2059 session->active = 1;
2060
2061 ret = LTTNG_OK;
2062
2063 error:
2064 return ret;
2065 }
2066
2067 /*
2068 * Command LTTNG_STOP_TRACE processed by the client thread.
2069 */
2070 int cmd_stop_trace(struct ltt_session *session)
2071 {
2072 int ret;
2073 struct ltt_kernel_channel *kchan;
2074 struct ltt_kernel_session *ksession;
2075 struct ltt_ust_session *usess;
2076
2077 assert(session);
2078
2079 /* Short cut */
2080 ksession = session->kernel_session;
2081 usess = session->ust_session;
2082
2083 /* Session is not active. Skip everythong and inform the client. */
2084 if (!session->active) {
2085 ret = LTTNG_ERR_TRACE_ALREADY_STOPPED;
2086 goto error;
2087 }
2088
2089 /* Kernel tracer */
2090 if (ksession && ksession->active) {
2091 DBG("Stop kernel tracing");
2092
2093 /* Flush metadata if exist */
2094 if (ksession->metadata_stream_fd >= 0) {
2095 ret = kernel_metadata_flush_buffer(ksession->metadata_stream_fd);
2096 if (ret < 0) {
2097 ERR("Kernel metadata flush failed");
2098 }
2099 }
2100
2101 /* Flush all buffers before stopping */
2102 cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
2103 ret = kernel_flush_buffer(kchan);
2104 if (ret < 0) {
2105 ERR("Kernel flush buffer error");
2106 }
2107 }
2108
2109 ret = kernel_stop_session(ksession);
2110 if (ret < 0) {
2111 ret = LTTNG_ERR_KERN_STOP_FAIL;
2112 goto error;
2113 }
2114
2115 kernel_wait_quiescent(kernel_tracer_fd);
2116
2117 ksession->active = 0;
2118 }
2119
2120 if (usess && usess->active) {
2121 /*
2122 * Even though the stop trace might fail, flag this session inactive so
2123 * other application coming in are not started by default.
2124 */
2125 usess->active = 0;
2126
2127 ret = ust_app_stop_trace_all(usess);
2128 if (ret < 0) {
2129 ret = LTTNG_ERR_UST_STOP_FAIL;
2130 goto error;
2131 }
2132 }
2133
2134 /* Flag inactive after a successful stop. */
2135 session->active = 0;
2136 ret = LTTNG_OK;
2137
2138 error:
2139 return ret;
2140 }
2141
2142 /*
2143 * Command LTTNG_SET_CONSUMER_URI processed by the client thread.
2144 */
2145 int cmd_set_consumer_uri(struct ltt_session *session, size_t nb_uri,
2146 struct lttng_uri *uris)
2147 {
2148 int ret, i;
2149 struct ltt_kernel_session *ksess = session->kernel_session;
2150 struct ltt_ust_session *usess = session->ust_session;
2151
2152 assert(session);
2153 assert(uris);
2154 assert(nb_uri > 0);
2155
2156 /* Can't set consumer URI if the session is active. */
2157 if (session->active) {
2158 ret = LTTNG_ERR_TRACE_ALREADY_STARTED;
2159 goto error;
2160 }
2161
2162 /* Set the "global" consumer URIs */
2163 for (i = 0; i < nb_uri; i++) {
2164 ret = add_uri_to_consumer(session->consumer,
2165 &uris[i], 0, session->name);
2166 if (ret != LTTNG_OK) {
2167 goto error;
2168 }
2169 }
2170
2171 /* Set UST session URIs */
2172 if (session->ust_session) {
2173 for (i = 0; i < nb_uri; i++) {
2174 ret = add_uri_to_consumer(
2175 session->ust_session->consumer,
2176 &uris[i], LTTNG_DOMAIN_UST,
2177 session->name);
2178 if (ret != LTTNG_OK) {
2179 goto error;
2180 }
2181 }
2182 }
2183
2184 /* Set kernel session URIs */
2185 if (session->kernel_session) {
2186 for (i = 0; i < nb_uri; i++) {
2187 ret = add_uri_to_consumer(
2188 session->kernel_session->consumer,
2189 &uris[i], LTTNG_DOMAIN_KERNEL,
2190 session->name);
2191 if (ret != LTTNG_OK) {
2192 goto error;
2193 }
2194 }
2195 }
2196
2197 /*
2198 * Make sure to set the session in output mode after we set URI since a
2199 * session can be created without URL (thus flagged in no output mode).
2200 */
2201 session->output_traces = 1;
2202 if (ksess) {
2203 ksess->output_traces = 1;
2204 }
2205
2206 if (usess) {
2207 usess->output_traces = 1;
2208 }
2209
2210 /* All good! */
2211 ret = LTTNG_OK;
2212
2213 error:
2214 return ret;
2215 }
2216
2217 /*
2218 * Command LTTNG_CREATE_SESSION processed by the client thread.
2219 */
2220 int cmd_create_session_uri(char *name, struct lttng_uri *uris,
2221 size_t nb_uri, lttng_sock_cred *creds, unsigned int live_timer)
2222 {
2223 int ret;
2224 struct ltt_session *session;
2225
2226 assert(name);
2227 assert(creds);
2228
2229 /*
2230 * Verify if the session already exist
2231 *
2232 * XXX: There is no need for the session lock list here since the caller
2233 * (process_client_msg) is holding it. We might want to change that so a
2234 * single command does not lock the entire session list.
2235 */
2236 session = session_find_by_name(name);
2237 if (session != NULL) {
2238 ret = LTTNG_ERR_EXIST_SESS;
2239 goto find_error;
2240 }
2241
2242 /* Create tracing session in the registry */
2243 ret = session_create(name, LTTNG_SOCK_GET_UID_CRED(creds),
2244 LTTNG_SOCK_GET_GID_CRED(creds));
2245 if (ret != LTTNG_OK) {
2246 goto session_error;
2247 }
2248
2249 /*
2250 * Get the newly created session pointer back
2251 *
2252 * XXX: There is no need for the session lock list here since the caller
2253 * (process_client_msg) is holding it. We might want to change that so a
2254 * single command does not lock the entire session list.
2255 */
2256 session = session_find_by_name(name);
2257 assert(session);
2258
2259 session->live_timer = live_timer;
2260 /* Create default consumer output for the session not yet created. */
2261 session->consumer = consumer_create_output(CONSUMER_DST_LOCAL);
2262 if (session->consumer == NULL) {
2263 ret = LTTNG_ERR_FATAL;
2264 goto consumer_error;
2265 }
2266
2267 if (uris) {
2268 ret = cmd_set_consumer_uri(session, nb_uri, uris);
2269 if (ret != LTTNG_OK) {
2270 goto consumer_error;
2271 }
2272 session->output_traces = 1;
2273 } else {
2274 session->output_traces = 0;
2275 DBG2("Session %s created with no output", session->name);
2276 }
2277
2278 session->consumer->enabled = 1;
2279
2280 return LTTNG_OK;
2281
2282 consumer_error:
2283 session_destroy(session);
2284 session_error:
2285 find_error:
2286 return ret;
2287 }
2288
2289 /*
2290 * Command LTTNG_CREATE_SESSION_SNAPSHOT processed by the client thread.
2291 */
2292 int cmd_create_session_snapshot(char *name, struct lttng_uri *uris,
2293 size_t nb_uri, lttng_sock_cred *creds)
2294 {
2295 int ret;
2296 struct ltt_session *session;
2297 struct snapshot_output *new_output = NULL;
2298
2299 assert(name);
2300 assert(creds);
2301
2302 /*
2303 * Create session in no output mode with URIs set to NULL. The uris we've
2304 * received are for a default snapshot output if one.
2305 */
2306 ret = cmd_create_session_uri(name, NULL, 0, creds, -1);
2307 if (ret != LTTNG_OK) {
2308 goto error;
2309 }
2310
2311 /* Get the newly created session pointer back. This should NEVER fail. */
2312 session = session_find_by_name(name);
2313 assert(session);
2314
2315 /* Flag session for snapshot mode. */
2316 session->snapshot_mode = 1;
2317
2318 /* Skip snapshot output creation if no URI is given. */
2319 if (nb_uri == 0) {
2320 goto end;
2321 }
2322
2323 new_output = snapshot_output_alloc();
2324 if (!new_output) {
2325 ret = LTTNG_ERR_NOMEM;
2326 goto error_snapshot_alloc;
2327 }
2328
2329 ret = snapshot_output_init_with_uri(DEFAULT_SNAPSHOT_MAX_SIZE, NULL,
2330 uris, nb_uri, session->consumer, new_output, &session->snapshot);
2331 if (ret < 0) {
2332 if (ret == -ENOMEM) {
2333 ret = LTTNG_ERR_NOMEM;
2334 } else {
2335 ret = LTTNG_ERR_INVALID;
2336 }
2337 goto error_snapshot;
2338 }
2339
2340 rcu_read_lock();
2341 snapshot_add_output(&session->snapshot, new_output);
2342 rcu_read_unlock();
2343
2344 end:
2345 return LTTNG_OK;
2346
2347 error_snapshot:
2348 snapshot_output_destroy(new_output);
2349 error_snapshot_alloc:
2350 session_destroy(session);
2351 error:
2352 return ret;
2353 }
2354
2355 /*
2356 * Command LTTNG_DESTROY_SESSION processed by the client thread.
2357 *
2358 * Called with session lock held.
2359 */
2360 int cmd_destroy_session(struct ltt_session *session, int wpipe)
2361 {
2362 int ret;
2363 struct ltt_ust_session *usess;
2364 struct ltt_kernel_session *ksess;
2365
2366 /* Safety net */
2367 assert(session);
2368
2369 usess = session->ust_session;
2370 ksess = session->kernel_session;
2371
2372 /* Clean kernel session teardown */
2373 kernel_destroy_session(ksess);
2374
2375 /* UST session teardown */
2376 if (usess) {
2377 /* Close any relayd session */
2378 consumer_output_send_destroy_relayd(usess->consumer);
2379
2380 /* Destroy every UST application related to this session. */
2381 ret = ust_app_destroy_trace_all(usess);
2382 if (ret) {
2383 ERR("Error in ust_app_destroy_trace_all");
2384 }
2385
2386 /* Clean up the rest. */
2387 trace_ust_destroy_session(usess);
2388 }
2389
2390 /*
2391 * Must notify the kernel thread here to update it's poll set in order to
2392 * remove the channel(s)' fd just destroyed.
2393 */
2394 ret = notify_thread_pipe(wpipe);
2395 if (ret < 0) {
2396 PERROR("write kernel poll pipe");
2397 }
2398
2399 ret = session_destroy(session);
2400
2401 return ret;
2402 }
2403
2404 /*
2405 * Command LTTNG_CALIBRATE processed by the client thread.
2406 */
2407 int cmd_calibrate(int domain, struct lttng_calibrate *calibrate)
2408 {
2409 int ret;
2410
2411 switch (domain) {
2412 case LTTNG_DOMAIN_KERNEL:
2413 {
2414 struct lttng_kernel_calibrate kcalibrate;
2415
2416 switch (calibrate->type) {
2417 case LTTNG_CALIBRATE_FUNCTION:
2418 default:
2419 /* Default and only possible calibrate option. */
2420 kcalibrate.type = LTTNG_KERNEL_CALIBRATE_KRETPROBE;
2421 break;
2422 }
2423
2424 ret = kernel_calibrate(kernel_tracer_fd, &kcalibrate);
2425 if (ret < 0) {
2426 ret = LTTNG_ERR_KERN_ENABLE_FAIL;
2427 goto error;
2428 }
2429 break;
2430 }
2431 case LTTNG_DOMAIN_UST:
2432 {
2433 struct lttng_ust_calibrate ucalibrate;
2434
2435 switch (calibrate->type) {
2436 case LTTNG_CALIBRATE_FUNCTION:
2437 default:
2438 /* Default and only possible calibrate option. */
2439 ucalibrate.type = LTTNG_UST_CALIBRATE_TRACEPOINT;
2440 break;
2441 }
2442
2443 ret = ust_app_calibrate_glb(&ucalibrate);
2444 if (ret < 0) {
2445 ret = LTTNG_ERR_UST_CALIBRATE_FAIL;
2446 goto error;
2447 }
2448 break;
2449 }
2450 default:
2451 ret = LTTNG_ERR_UND;
2452 goto error;
2453 }
2454
2455 ret = LTTNG_OK;
2456
2457 error:
2458 return ret;
2459 }
2460
2461 /*
2462 * Command LTTNG_REGISTER_CONSUMER processed by the client thread.
2463 */
2464 int cmd_register_consumer(struct ltt_session *session, int domain,
2465 const char *sock_path, struct consumer_data *cdata)
2466 {
2467 int ret, sock;
2468 struct consumer_socket *socket = NULL;
2469
2470 assert(session);
2471 assert(cdata);
2472 assert(sock_path);
2473
2474 switch (domain) {
2475 case LTTNG_DOMAIN_KERNEL:
2476 {
2477 struct ltt_kernel_session *ksess = session->kernel_session;
2478
2479 assert(ksess);
2480
2481 /* Can't register a consumer if there is already one */
2482 if (ksess->consumer_fds_sent != 0) {
2483 ret = LTTNG_ERR_KERN_CONSUMER_FAIL;
2484 goto error;
2485 }
2486
2487 sock = lttcomm_connect_unix_sock(sock_path);
2488 if (sock < 0) {
2489 ret = LTTNG_ERR_CONNECT_FAIL;
2490 goto error;
2491 }
2492 cdata->cmd_sock = sock;
2493
2494 socket = consumer_allocate_socket(&cdata->cmd_sock);
2495 if (socket == NULL) {
2496 ret = close(sock);
2497 if (ret < 0) {
2498 PERROR("close register consumer");
2499 }
2500 cdata->cmd_sock = -1;
2501 ret = LTTNG_ERR_FATAL;
2502 goto error;
2503 }
2504
2505 socket->lock = zmalloc(sizeof(pthread_mutex_t));
2506 if (socket->lock == NULL) {
2507 PERROR("zmalloc pthread mutex");
2508 ret = LTTNG_ERR_FATAL;
2509 goto error;
2510 }
2511 pthread_mutex_init(socket->lock, NULL);
2512 socket->registered = 1;
2513
2514 rcu_read_lock();
2515 consumer_add_socket(socket, ksess->consumer);
2516 rcu_read_unlock();
2517
2518 pthread_mutex_lock(&cdata->pid_mutex);
2519 cdata->pid = -1;
2520 pthread_mutex_unlock(&cdata->pid_mutex);
2521
2522 break;
2523 }
2524 default:
2525 /* TODO: Userspace tracing */
2526 ret = LTTNG_ERR_UND;
2527 goto error;
2528 }
2529
2530 return LTTNG_OK;
2531
2532 error:
2533 if (socket) {
2534 consumer_destroy_socket(socket);
2535 }
2536 return ret;
2537 }
2538
2539 /*
2540 * Command LTTNG_LIST_DOMAINS processed by the client thread.
2541 */
2542 ssize_t cmd_list_domains(struct ltt_session *session,
2543 struct lttng_domain **domains)
2544 {
2545 int ret, index = 0;
2546 ssize_t nb_dom = 0;
2547 struct agent *agt;
2548 struct lttng_ht_iter iter;
2549
2550 if (session->kernel_session != NULL) {
2551 DBG3("Listing domains found kernel domain");
2552 nb_dom++;
2553 }
2554
2555 if (session->ust_session != NULL) {
2556 DBG3("Listing domains found UST global domain");
2557 nb_dom++;
2558
2559 rcu_read_lock();
2560 cds_lfht_for_each_entry(session->ust_session->agents->ht, &iter.iter,
2561 agt, node.node) {
2562 if (agt->being_used) {
2563 nb_dom++;
2564 }
2565 }
2566 rcu_read_unlock();
2567 }
2568
2569 if (!nb_dom) {
2570 goto end;
2571 }
2572
2573 *domains = zmalloc(nb_dom * sizeof(struct lttng_domain));
2574 if (*domains == NULL) {
2575 ret = LTTNG_ERR_FATAL;
2576 goto error;
2577 }
2578
2579 if (session->kernel_session != NULL) {
2580 (*domains)[index].type = LTTNG_DOMAIN_KERNEL;
2581
2582 /* Kernel session buffer type is always GLOBAL */
2583 (*domains)[index].buf_type = LTTNG_BUFFER_GLOBAL;
2584
2585 index++;
2586 }
2587
2588 if (session->ust_session != NULL) {
2589 (*domains)[index].type = LTTNG_DOMAIN_UST;
2590 (*domains)[index].buf_type = session->ust_session->buffer_type;
2591 index++;
2592
2593 rcu_read_lock();
2594 cds_lfht_for_each_entry(session->ust_session->agents->ht, &iter.iter,
2595 agt, node.node) {
2596 if (agt->being_used) {
2597 (*domains)[index].type = agt->domain;
2598 (*domains)[index].buf_type = session->ust_session->buffer_type;
2599 index++;
2600 }
2601 }
2602 rcu_read_unlock();
2603 }
2604 end:
2605 return nb_dom;
2606
2607 error:
2608 /* Return negative value to differentiate return code */
2609 return -ret;
2610 }
2611
2612
2613 /*
2614 * Command LTTNG_LIST_CHANNELS processed by the client thread.
2615 */
2616 ssize_t cmd_list_channels(int domain, struct ltt_session *session,
2617 struct lttng_channel **channels)
2618 {
2619 int ret;
2620 ssize_t nb_chan = 0;
2621
2622 switch (domain) {
2623 case LTTNG_DOMAIN_KERNEL:
2624 if (session->kernel_session != NULL) {
2625 nb_chan = session->kernel_session->channel_count;
2626 }
2627 DBG3("Number of kernel channels %zd", nb_chan);
2628 if (nb_chan <= 0) {
2629 ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND;
2630 }
2631 break;
2632 case LTTNG_DOMAIN_UST:
2633 if (session->ust_session != NULL) {
2634 rcu_read_lock();
2635 nb_chan = lttng_ht_get_count(
2636 session->ust_session->domain_global.channels);
2637 rcu_read_unlock();
2638 }
2639 DBG3("Number of UST global channels %zd", nb_chan);
2640 if (nb_chan < 0) {
2641 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
2642 goto error;
2643 }
2644 break;
2645 default:
2646 ret = LTTNG_ERR_UND;
2647 goto error;
2648 }
2649
2650 if (nb_chan > 0) {
2651 *channels = zmalloc(nb_chan * sizeof(struct lttng_channel));
2652 if (*channels == NULL) {
2653 ret = LTTNG_ERR_FATAL;
2654 goto error;
2655 }
2656
2657 list_lttng_channels(domain, session, *channels);
2658 }
2659
2660 return nb_chan;
2661
2662 error:
2663 /* Return negative value to differentiate return code */
2664 return -ret;
2665 }
2666
2667 /*
2668 * Command LTTNG_LIST_EVENTS processed by the client thread.
2669 */
2670 ssize_t cmd_list_events(int domain, struct ltt_session *session,
2671 char *channel_name, struct lttng_event **events)
2672 {
2673 int ret = 0;
2674 ssize_t nb_event = 0;
2675
2676 switch (domain) {
2677 case LTTNG_DOMAIN_KERNEL:
2678 if (session->kernel_session != NULL) {
2679 nb_event = list_lttng_kernel_events(channel_name,
2680 session->kernel_session, events);
2681 }
2682 break;
2683 case LTTNG_DOMAIN_UST:
2684 {
2685 if (session->ust_session != NULL) {
2686 nb_event = list_lttng_ust_global_events(channel_name,
2687 &session->ust_session->domain_global, events);
2688 }
2689 break;
2690 }
2691 case LTTNG_DOMAIN_LOG4J:
2692 case LTTNG_DOMAIN_JUL:
2693 case LTTNG_DOMAIN_PYTHON:
2694 if (session->ust_session) {
2695 struct lttng_ht_iter iter;
2696 struct agent *agt;
2697
2698 rcu_read_lock();
2699 cds_lfht_for_each_entry(session->ust_session->agents->ht,
2700 &iter.iter, agt, node.node) {
2701 nb_event = list_lttng_agent_events(agt, events);
2702 }
2703 rcu_read_unlock();
2704 }
2705 break;
2706 default:
2707 ret = LTTNG_ERR_UND;
2708 goto error;
2709 }
2710
2711 return nb_event;
2712
2713 error:
2714 /* Return negative value to differentiate return code */
2715 return -ret;
2716 }
2717
2718 /*
2719 * Using the session list, filled a lttng_session array to send back to the
2720 * client for session listing.
2721 *
2722 * The session list lock MUST be acquired before calling this function. Use
2723 * session_lock_list() and session_unlock_list().
2724 */
2725 void cmd_list_lttng_sessions(struct lttng_session *sessions, uid_t uid,
2726 gid_t gid)
2727 {
2728 int ret;
2729 unsigned int i = 0;
2730 struct ltt_session *session;
2731 struct ltt_session_list *list = session_get_list();
2732
2733 DBG("Getting all available session for UID %d GID %d",
2734 uid, gid);
2735 /*
2736 * Iterate over session list and append data after the control struct in
2737 * the buffer.
2738 */
2739 cds_list_for_each_entry(session, &list->head, list) {
2740 /*
2741 * Only list the sessions the user can control.
2742 */
2743 if (!session_access_ok(session, uid, gid)) {
2744 continue;
2745 }
2746
2747 struct ltt_kernel_session *ksess = session->kernel_session;
2748 struct ltt_ust_session *usess = session->ust_session;
2749
2750 if (session->consumer->type == CONSUMER_DST_NET ||
2751 (ksess && ksess->consumer->type == CONSUMER_DST_NET) ||
2752 (usess && usess->consumer->type == CONSUMER_DST_NET)) {
2753 ret = build_network_session_path(sessions[i].path,
2754 sizeof(sessions[i].path), session);
2755 } else {
2756 ret = snprintf(sessions[i].path, sizeof(sessions[i].path), "%s",
2757 session->consumer->dst.trace_path);
2758 }
2759 if (ret < 0) {
2760 PERROR("snprintf session path");
2761 continue;
2762 }
2763
2764 strncpy(sessions[i].name, session->name, NAME_MAX);
2765 sessions[i].name[NAME_MAX - 1] = '\0';
2766 sessions[i].enabled = session->active;
2767 sessions[i].snapshot_mode = session->snapshot_mode;
2768 sessions[i].live_timer_interval = session->live_timer;
2769 i++;
2770 }
2771 }
2772
2773 /*
2774 * Command LTTNG_DATA_PENDING returning 0 if the data is NOT pending meaning
2775 * ready for trace analysis (or any kind of reader) or else 1 for pending data.
2776 */
2777 int cmd_data_pending(struct ltt_session *session)
2778 {
2779 int ret;
2780 struct ltt_kernel_session *ksess = session->kernel_session;
2781 struct ltt_ust_session *usess = session->ust_session;
2782
2783 assert(session);
2784
2785 /* Session MUST be stopped to ask for data availability. */
2786 if (session->active) {
2787 ret = LTTNG_ERR_SESSION_STARTED;
2788 goto error;
2789 } else {
2790 /*
2791 * If stopped, just make sure we've started before else the above call
2792 * will always send that there is data pending.
2793 *
2794 * The consumer assumes that when the data pending command is received,
2795 * the trace has been started before or else no output data is written
2796 * by the streams which is a condition for data pending. So, this is
2797 * *VERY* important that we don't ask the consumer before a start
2798 * trace.
2799 */
2800 if (!session->has_been_started) {
2801 ret = 0;
2802 goto error;
2803 }
2804 }
2805
2806 if (ksess && ksess->consumer) {
2807 ret = consumer_is_data_pending(ksess->id, ksess->consumer);
2808 if (ret == 1) {
2809 /* Data is still being extracted for the kernel. */
2810 goto error;
2811 }
2812 }
2813
2814 if (usess && usess->consumer) {
2815 ret = consumer_is_data_pending(usess->id, usess->consumer);
2816 if (ret == 1) {
2817 /* Data is still being extracted for the kernel. */
2818 goto error;
2819 }
2820 }
2821
2822 /* Data is ready to be read by a viewer */
2823 ret = 0;
2824
2825 error:
2826 return ret;
2827 }
2828
2829 /*
2830 * Command LTTNG_SNAPSHOT_ADD_OUTPUT from the lttng ctl library.
2831 *
2832 * Return LTTNG_OK on success or else a LTTNG_ERR code.
2833 */
2834 int cmd_snapshot_add_output(struct ltt_session *session,
2835 struct lttng_snapshot_output *output, uint32_t *id)
2836 {
2837 int ret;
2838 struct snapshot_output *new_output;
2839
2840 assert(session);
2841 assert(output);
2842
2843 DBG("Cmd snapshot add output for session %s", session->name);
2844
2845 /*
2846 * Permission denied to create an output if the session is not
2847 * set in no output mode.
2848 */
2849 if (session->output_traces) {
2850 ret = LTTNG_ERR_EPERM;
2851 goto error;
2852 }
2853
2854 /* Only one output is allowed until we have the "tee" feature. */
2855 if (session->snapshot.nb_output == 1) {
2856 ret = LTTNG_ERR_SNAPSHOT_OUTPUT_EXIST;
2857 goto error;
2858 }
2859
2860 new_output = snapshot_output_alloc();
2861 if (!new_output) {
2862 ret = LTTNG_ERR_NOMEM;
2863 goto error;
2864 }
2865
2866 ret = snapshot_output_init(output->max_size, output->name,
2867 output->ctrl_url, output->data_url, session->consumer, new_output,
2868 &session->snapshot);
2869 if (ret < 0) {
2870 if (ret == -ENOMEM) {
2871 ret = LTTNG_ERR_NOMEM;
2872 } else {
2873 ret = LTTNG_ERR_INVALID;
2874 }
2875 goto free_error;
2876 }
2877
2878 rcu_read_lock();
2879 snapshot_add_output(&session->snapshot, new_output);
2880 if (id) {
2881 *id = new_output->id;
2882 }
2883 rcu_read_unlock();
2884
2885 return LTTNG_OK;
2886
2887 free_error:
2888 snapshot_output_destroy(new_output);
2889 error:
2890 return ret;
2891 }
2892
2893 /*
2894 * Command LTTNG_SNAPSHOT_DEL_OUTPUT from lib lttng ctl.
2895 *
2896 * Return LTTNG_OK on success or else a LTTNG_ERR code.
2897 */
2898 int cmd_snapshot_del_output(struct ltt_session *session,
2899 struct lttng_snapshot_output *output)
2900 {
2901 int ret;
2902 struct snapshot_output *sout = NULL;
2903
2904 assert(session);
2905 assert(output);
2906
2907 rcu_read_lock();
2908
2909 /*
2910 * Permission denied to create an output if the session is not
2911 * set in no output mode.
2912 */
2913 if (session->output_traces) {
2914 ret = LTTNG_ERR_EPERM;
2915 goto error;
2916 }
2917
2918 if (output->id) {
2919 DBG("Cmd snapshot del output id %" PRIu32 " for session %s", output->id,
2920 session->name);
2921 sout = snapshot_find_output_by_id(output->id, &session->snapshot);
2922 } else if (*output->name != '\0') {
2923 DBG("Cmd snapshot del output name %s for session %s", output->name,
2924 session->name);
2925 sout = snapshot_find_output_by_name(output->name, &session->snapshot);
2926 }
2927 if (!sout) {
2928 ret = LTTNG_ERR_INVALID;
2929 goto error;
2930 }
2931
2932 snapshot_delete_output(&session->snapshot, sout);
2933 snapshot_output_destroy(sout);
2934 ret = LTTNG_OK;
2935
2936 error:
2937 rcu_read_unlock();
2938 return ret;
2939 }
2940
2941 /*
2942 * Command LTTNG_SNAPSHOT_LIST_OUTPUT from lib lttng ctl.
2943 *
2944 * If no output is available, outputs is untouched and 0 is returned.
2945 *
2946 * Return the size of the newly allocated outputs or a negative LTTNG_ERR code.
2947 */
2948 ssize_t cmd_snapshot_list_outputs(struct ltt_session *session,
2949 struct lttng_snapshot_output **outputs)
2950 {
2951 int ret, idx = 0;
2952 struct lttng_snapshot_output *list = NULL;
2953 struct lttng_ht_iter iter;
2954 struct snapshot_output *output;
2955
2956 assert(session);
2957 assert(outputs);
2958
2959 DBG("Cmd snapshot list outputs for session %s", session->name);
2960
2961 /*
2962 * Permission denied to create an output if the session is not
2963 * set in no output mode.
2964 */
2965 if (session->output_traces) {
2966 ret = -LTTNG_ERR_EPERM;
2967 goto error;
2968 }
2969
2970 if (session->snapshot.nb_output == 0) {
2971 ret = 0;
2972 goto error;
2973 }
2974
2975 list = zmalloc(session->snapshot.nb_output * sizeof(*list));
2976 if (!list) {
2977 ret = -LTTNG_ERR_NOMEM;
2978 goto error;
2979 }
2980
2981 /* Copy list from session to the new list object. */
2982 rcu_read_lock();
2983 cds_lfht_for_each_entry(session->snapshot.output_ht->ht, &iter.iter,
2984 output, node.node) {
2985 assert(output->consumer);
2986 list[idx].id = output->id;
2987 list[idx].max_size = output->max_size;
2988 strncpy(list[idx].name, output->name, sizeof(list[idx].name));
2989 if (output->consumer->type == CONSUMER_DST_LOCAL) {
2990 strncpy(list[idx].ctrl_url, output->consumer->dst.trace_path,
2991 sizeof(list[idx].ctrl_url));
2992 } else {
2993 /* Control URI. */
2994 ret = uri_to_str_url(&output->consumer->dst.net.control,
2995 list[idx].ctrl_url, sizeof(list[idx].ctrl_url));
2996 if (ret < 0) {
2997 ret = -LTTNG_ERR_NOMEM;
2998 goto error;
2999 }
3000
3001 /* Data URI. */
3002 ret = uri_to_str_url(&output->consumer->dst.net.data,
3003 list[idx].data_url, sizeof(list[idx].data_url));
3004 if (ret < 0) {
3005 ret = -LTTNG_ERR_NOMEM;
3006 goto error;
3007 }
3008 }
3009 idx++;
3010 }
3011
3012 *outputs = list;
3013 list = NULL;
3014 ret = session->snapshot.nb_output;
3015 error:
3016 free(list);
3017 rcu_read_unlock();
3018 return ret;
3019 }
3020
3021 /*
3022 * Send relayd sockets from snapshot output to consumer. Ignore request if the
3023 * snapshot output is *not* set with a remote destination.
3024 *
3025 * Return 0 on success or a LTTNG_ERR code.
3026 */
3027 static int set_relayd_for_snapshot(struct consumer_output *consumer,
3028 struct snapshot_output *snap_output, struct ltt_session *session)
3029 {
3030 int ret = LTTNG_OK;
3031 struct lttng_ht_iter iter;
3032 struct consumer_socket *socket;
3033
3034 assert(consumer);
3035 assert(snap_output);
3036 assert(session);
3037
3038 DBG2("Set relayd object from snapshot output");
3039
3040 /* Ignore if snapshot consumer output is not network. */
3041 if (snap_output->consumer->type != CONSUMER_DST_NET) {
3042 goto error;
3043 }
3044
3045 /*
3046 * For each consumer socket, create and send the relayd object of the
3047 * snapshot output.
3048 */
3049 rcu_read_lock();
3050 cds_lfht_for_each_entry(snap_output->consumer->socks->ht, &iter.iter,
3051 socket, node.node) {
3052 ret = send_consumer_relayd_sockets(0, session->id,
3053 snap_output->consumer, socket,
3054 session->name, session->hostname,
3055 session->live_timer);
3056 if (ret != LTTNG_OK) {
3057 rcu_read_unlock();
3058 goto error;
3059 }
3060 }
3061 rcu_read_unlock();
3062
3063 error:
3064 return ret;
3065 }
3066
3067 /*
3068 * Record a kernel snapshot.
3069 *
3070 * Return LTTNG_OK on success or a LTTNG_ERR code.
3071 */
3072 static int record_kernel_snapshot(struct ltt_kernel_session *ksess,
3073 struct snapshot_output *output, struct ltt_session *session,
3074 int wait, uint64_t nb_packets_per_stream)
3075 {
3076 int ret;
3077
3078 assert(ksess);
3079 assert(output);
3080 assert(session);
3081
3082 /* Get the datetime for the snapshot output directory. */
3083 ret = utils_get_current_time_str("%Y%m%d-%H%M%S", output->datetime,
3084 sizeof(output->datetime));
3085 if (!ret) {
3086 ret = LTTNG_ERR_INVALID;
3087 goto error;
3088 }
3089
3090 /*
3091 * Copy kernel session sockets so we can communicate with the right
3092 * consumer for the snapshot record command.
3093 */
3094 ret = consumer_copy_sockets(output->consumer, ksess->consumer);
3095 if (ret < 0) {
3096 ret = LTTNG_ERR_NOMEM;
3097 goto error;
3098 }
3099
3100 ret = set_relayd_for_snapshot(ksess->consumer, output, session);
3101 if (ret != LTTNG_OK) {
3102 goto error_snapshot;
3103 }
3104
3105 ret = kernel_snapshot_record(ksess, output, wait, nb_packets_per_stream);
3106 if (ret != LTTNG_OK) {
3107 goto error_snapshot;
3108 }
3109
3110 ret = LTTNG_OK;
3111 goto end;
3112
3113 error_snapshot:
3114 /* Clean up copied sockets so this output can use some other later on. */
3115 consumer_destroy_output_sockets(output->consumer);
3116 error:
3117 end:
3118 return ret;
3119 }
3120
3121 /*
3122 * Record a UST snapshot.
3123 *
3124 * Return 0 on success or a LTTNG_ERR error code.
3125 */
3126 static int record_ust_snapshot(struct ltt_ust_session *usess,
3127 struct snapshot_output *output, struct ltt_session *session,
3128 int wait, uint64_t nb_packets_per_stream)
3129 {
3130 int ret;
3131
3132 assert(usess);
3133 assert(output);
3134 assert(session);
3135
3136 /* Get the datetime for the snapshot output directory. */
3137 ret = utils_get_current_time_str("%Y%m%d-%H%M%S", output->datetime,
3138 sizeof(output->datetime));
3139 if (!ret) {
3140 ret = LTTNG_ERR_INVALID;
3141 goto error;
3142 }
3143
3144 /*
3145 * Copy UST session sockets so we can communicate with the right
3146 * consumer for the snapshot record command.
3147 */
3148 ret = consumer_copy_sockets(output->consumer, usess->consumer);
3149 if (ret < 0) {
3150 ret = LTTNG_ERR_NOMEM;
3151 goto error;
3152 }
3153
3154 ret = set_relayd_for_snapshot(usess->consumer, output, session);
3155 if (ret != LTTNG_OK) {
3156 goto error_snapshot;
3157 }
3158
3159 ret = ust_app_snapshot_record(usess, output, wait, nb_packets_per_stream);
3160 if (ret < 0) {
3161 switch (-ret) {
3162 case EINVAL:
3163 ret = LTTNG_ERR_INVALID;
3164 break;
3165 case ENODATA:
3166 ret = LTTNG_ERR_SNAPSHOT_NODATA;
3167 break;
3168 default:
3169 ret = LTTNG_ERR_SNAPSHOT_FAIL;
3170 break;
3171 }
3172 goto error_snapshot;
3173 }
3174
3175 ret = LTTNG_OK;
3176
3177 error_snapshot:
3178 /* Clean up copied sockets so this output can use some other later on. */
3179 consumer_destroy_output_sockets(output->consumer);
3180 error:
3181 return ret;
3182 }
3183
3184 static
3185 uint64_t get_session_size_one_more_packet_per_stream(struct ltt_session *session,
3186 uint64_t cur_nr_packets)
3187 {
3188 uint64_t tot_size = 0;
3189
3190 if (session->kernel_session) {
3191 struct ltt_kernel_channel *chan;
3192 struct ltt_kernel_session *ksess = session->kernel_session;
3193
3194 cds_list_for_each_entry(chan, &ksess->channel_list.head, list) {
3195 if (cur_nr_packets >= chan->channel->attr.num_subbuf) {
3196 /*
3197 * Don't take channel into account if we
3198 * already grab all its packets.
3199 */
3200 continue;
3201 }
3202 tot_size += chan->channel->attr.subbuf_size
3203 * chan->stream_count;
3204 }
3205 }
3206
3207 if (session->ust_session) {
3208 struct ltt_ust_session *usess = session->ust_session;
3209
3210 tot_size += ust_app_get_size_one_more_packet_per_stream(usess,
3211 cur_nr_packets);
3212 }
3213
3214 return tot_size;
3215 }
3216
3217 /*
3218 * Calculate the number of packets we can grab from each stream that
3219 * fits within the overall snapshot max size.
3220 *
3221 * Returns -1 on error, 0 means infinite number of packets, else > 0 is
3222 * the number of packets per stream.
3223 *
3224 * TODO: this approach is not perfect: we consider the worse case
3225 * (packet filling the sub-buffers) as an upper bound, but we could do
3226 * better if we do this calculation while we actually grab the packet
3227 * content: we would know how much padding we don't actually store into
3228 * the file.
3229 *
3230 * This algorithm is currently bounded by the number of packets per
3231 * stream.
3232 *
3233 * Since we call this algorithm before actually grabbing the data, it's
3234 * an approximation: for instance, applications could appear/disappear
3235 * in between this call and actually grabbing data.
3236 */
3237 static
3238 int64_t get_session_nb_packets_per_stream(struct ltt_session *session, uint64_t max_size)
3239 {
3240 int64_t size_left;
3241 uint64_t cur_nb_packets = 0;
3242
3243 if (!max_size) {
3244 return 0; /* Infinite */
3245 }
3246
3247 size_left = max_size;
3248 for (;;) {
3249 uint64_t one_more_packet_tot_size;
3250
3251 one_more_packet_tot_size = get_session_size_one_more_packet_per_stream(session,
3252 cur_nb_packets);
3253 if (!one_more_packet_tot_size) {
3254 /* We are already grabbing all packets. */
3255 break;
3256 }
3257 size_left -= one_more_packet_tot_size;
3258 if (size_left < 0) {
3259 break;
3260 }
3261 cur_nb_packets++;
3262 }
3263 if (!cur_nb_packets) {
3264 /* Not enough room to grab one packet of each stream, error. */
3265 return -1;
3266 }
3267 return cur_nb_packets;
3268 }
3269
3270 /*
3271 * Command LTTNG_SNAPSHOT_RECORD from lib lttng ctl.
3272 *
3273 * The wait parameter is ignored so this call always wait for the snapshot to
3274 * complete before returning.
3275 *
3276 * Return LTTNG_OK on success or else a LTTNG_ERR code.
3277 */
3278 int cmd_snapshot_record(struct ltt_session *session,
3279 struct lttng_snapshot_output *output, int wait)
3280 {
3281 int ret = LTTNG_OK;
3282 unsigned int use_tmp_output = 0;
3283 struct snapshot_output tmp_output;
3284 unsigned int snapshot_success = 0;
3285
3286 assert(session);
3287 assert(output);
3288
3289 DBG("Cmd snapshot record for session %s", session->name);
3290
3291 /*
3292 * Permission denied to create an output if the session is not
3293 * set in no output mode.
3294 */
3295 if (session->output_traces) {
3296 ret = LTTNG_ERR_EPERM;
3297 goto error;
3298 }
3299
3300 /* The session needs to be started at least once. */
3301 if (!session->has_been_started) {
3302 ret = LTTNG_ERR_START_SESSION_ONCE;
3303 goto error;
3304 }
3305
3306 /* Use temporary output for the session. */
3307 if (*output->ctrl_url != '\0') {
3308 ret = snapshot_output_init(output->max_size, output->name,
3309 output->ctrl_url, output->data_url, session->consumer,
3310 &tmp_output, NULL);
3311 if (ret < 0) {
3312 if (ret == -ENOMEM) {
3313 ret = LTTNG_ERR_NOMEM;
3314 } else {
3315 ret = LTTNG_ERR_INVALID;
3316 }
3317 goto error;
3318 }
3319 /* Use the global session count for the temporary snapshot. */
3320 tmp_output.nb_snapshot = session->snapshot.nb_snapshot;
3321 use_tmp_output = 1;
3322 }
3323
3324 if (session->kernel_session) {
3325 struct ltt_kernel_session *ksess = session->kernel_session;
3326
3327 if (use_tmp_output) {
3328 int64_t nb_packets_per_stream;
3329
3330 nb_packets_per_stream = get_session_nb_packets_per_stream(session,
3331 tmp_output.max_size);
3332 if (nb_packets_per_stream < 0) {
3333 ret = LTTNG_ERR_MAX_SIZE_INVALID;
3334 goto error;
3335 }
3336 ret = record_kernel_snapshot(ksess, &tmp_output, session,
3337 wait, nb_packets_per_stream);
3338 if (ret != LTTNG_OK) {
3339 goto error;
3340 }
3341 snapshot_success = 1;
3342 } else {
3343 struct snapshot_output *sout;
3344 struct lttng_ht_iter iter;
3345
3346 rcu_read_lock();
3347 cds_lfht_for_each_entry(session->snapshot.output_ht->ht,
3348 &iter.iter, sout, node.node) {
3349 int64_t nb_packets_per_stream;
3350
3351 /*
3352 * Make a local copy of the output and assign the possible
3353 * temporary value given by the caller.
3354 */
3355 memset(&tmp_output, 0, sizeof(tmp_output));
3356 memcpy(&tmp_output, sout, sizeof(tmp_output));
3357
3358 if (output->max_size != (uint64_t) -1ULL) {
3359 tmp_output.max_size = output->max_size;
3360 }
3361
3362 nb_packets_per_stream = get_session_nb_packets_per_stream(session,
3363 tmp_output.max_size);
3364 if (nb_packets_per_stream < 0) {
3365 ret = LTTNG_ERR_MAX_SIZE_INVALID;
3366 goto error;
3367 }
3368
3369 /* Use temporary name. */
3370 if (*output->name != '\0') {
3371 strncpy(tmp_output.name, output->name,
3372 sizeof(tmp_output.name));
3373 }
3374
3375 tmp_output.nb_snapshot = session->snapshot.nb_snapshot;
3376
3377 ret = record_kernel_snapshot(ksess, &tmp_output,
3378 session, wait, nb_packets_per_stream);
3379 if (ret != LTTNG_OK) {
3380 rcu_read_unlock();
3381 goto error;
3382 }
3383 snapshot_success = 1;
3384 }
3385 rcu_read_unlock();
3386 }
3387 }
3388
3389 if (session->ust_session) {
3390 struct ltt_ust_session *usess = session->ust_session;
3391
3392 if (use_tmp_output) {
3393 int64_t nb_packets_per_stream;
3394
3395 nb_packets_per_stream = get_session_nb_packets_per_stream(session,
3396 tmp_output.max_size);
3397 if (nb_packets_per_stream < 0) {
3398 ret = LTTNG_ERR_MAX_SIZE_INVALID;
3399 goto error;
3400 }
3401 ret = record_ust_snapshot(usess, &tmp_output, session,
3402 wait, nb_packets_per_stream);
3403 if (ret != LTTNG_OK) {
3404 goto error;
3405 }
3406 snapshot_success = 1;
3407 } else {
3408 struct snapshot_output *sout;
3409 struct lttng_ht_iter iter;
3410
3411 rcu_read_lock();
3412 cds_lfht_for_each_entry(session->snapshot.output_ht->ht,
3413 &iter.iter, sout, node.node) {
3414 int64_t nb_packets_per_stream;
3415
3416 /*
3417 * Make a local copy of the output and assign the possible
3418 * temporary value given by the caller.
3419 */
3420 memset(&tmp_output, 0, sizeof(tmp_output));
3421 memcpy(&tmp_output, sout, sizeof(tmp_output));
3422
3423 if (output->max_size != (uint64_t) -1ULL) {
3424 tmp_output.max_size = output->max_size;
3425 }
3426
3427 nb_packets_per_stream = get_session_nb_packets_per_stream(session,
3428 tmp_output.max_size);
3429 if (nb_packets_per_stream < 0) {
3430 ret = LTTNG_ERR_MAX_SIZE_INVALID;
3431 rcu_read_unlock();
3432 goto error;
3433 }
3434
3435 /* Use temporary name. */
3436 if (*output->name != '\0') {
3437 strncpy(tmp_output.name, output->name,
3438 sizeof(tmp_output.name));
3439 }
3440
3441 tmp_output.nb_snapshot = session->snapshot.nb_snapshot;
3442
3443 ret = record_ust_snapshot(usess, &tmp_output, session,
3444 wait, nb_packets_per_stream);
3445 if (ret != LTTNG_OK) {
3446 rcu_read_unlock();
3447 goto error;
3448 }
3449 snapshot_success = 1;
3450 }
3451 rcu_read_unlock();
3452 }
3453 }
3454
3455 if (snapshot_success) {
3456 session->snapshot.nb_snapshot++;
3457 } else {
3458 ret = LTTNG_ERR_SNAPSHOT_FAIL;
3459 }
3460
3461 error:
3462 return ret;
3463 }
3464
3465 /*
3466 * Command LTTNG_SET_SESSION_SHM_PATH processed by the client thread.
3467 */
3468 int cmd_set_session_shm_path(struct ltt_session *session,
3469 const char *shm_path)
3470 {
3471 /* Safety net */
3472 assert(session);
3473
3474 /*
3475 * Can only set shm path before session is started.
3476 */
3477 if (session->has_been_started) {
3478 return LTTNG_ERR_SESSION_STARTED;
3479 }
3480
3481 strncpy(session->shm_path, shm_path,
3482 sizeof(session->shm_path));
3483 session->shm_path[sizeof(session->shm_path) - 1] = '\0';
3484
3485 return 0;
3486 }
3487
3488 /*
3489 * Init command subsystem.
3490 */
3491 void cmd_init(void)
3492 {
3493 /*
3494 * Set network sequence index to 1 for streams to match a relayd
3495 * socket on the consumer side.
3496 */
3497 pthread_mutex_lock(&relayd_net_seq_idx_lock);
3498 relayd_net_seq_idx = 1;
3499 pthread_mutex_unlock(&relayd_net_seq_idx_lock);
3500
3501 DBG("Command subsystem initialized");
3502 }
LTTng 2.0 tools and control repository
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