Fix: sessiond: leak of trigger on registration error
[lttng-tools.git] / src / bin / lttng-sessiond / cmd.c
CommitLineData
2f77fc4b 1/*
ab5be9fa
MJ
2 * Copyright (C) 2012 David Goulet <dgoulet@efficios.com>
3 * Copyright (C) 2016 Jérémie Galarneau <jeremie.galarneau@efficios.com>
2f77fc4b 4 *
ab5be9fa 5 * SPDX-License-Identifier: GPL-2.0-only
2f77fc4b 6 *
2f77fc4b
DG
7 */
8
6c1c0768 9#define _LGPL_SOURCE
2f77fc4b 10#include <assert.h>
6dc3064a 11#include <inttypes.h>
2f77fc4b
DG
12#include <urcu/list.h>
13#include <urcu/uatomic.h>
a503e1ef 14#include <sys/stat.h>
d2956687 15#include <stdio.h>
2f77fc4b
DG
16
17#include <common/defaults.h>
18#include <common/common.h>
19#include <common/sessiond-comm/sessiond-comm.h>
20#include <common/relayd/relayd.h>
10a50311 21#include <common/utils.h>
f5436bfc 22#include <common/compat/string.h>
93ec662e 23#include <common/kernel-ctl/kernel-ctl.h>
b0880ae5
JG
24#include <common/dynamic-buffer.h>
25#include <common/buffer-view.h>
9e620ea7
JG
26#include <common/payload.h>
27#include <common/payload-view.h>
82b69413 28#include <common/trace-chunk.h>
3e3665b8 29#include <lttng/location-internal.h>
b0880ae5
JG
30#include <lttng/trigger/trigger-internal.h>
31#include <lttng/condition/condition.h>
70670472
JR
32#include <lttng/condition/condition-internal.h>
33#include <lttng/condition/event-rule.h>
34#include <lttng/condition/event-rule-internal.h>
35#include <lttng/event-rule/event-rule.h>
36#include <lttng/event-rule/event-rule-internal.h>
b0880ae5 37#include <lttng/action/action.h>
6e21424e 38#include <lttng/channel.h>
b0880ae5 39#include <lttng/channel-internal.h>
5c408ad8 40#include <lttng/rotate-internal.h>
17dd1232 41#include <lttng/location-internal.h>
b178f53e 42#include <lttng/session-internal.h>
3c02e545 43#include <lttng/userspace-probe-internal.h>
b178f53e 44#include <lttng/session-descriptor-internal.h>
47aa1ca6
JG
45#include <lttng/lttng-error.h>
46#include <lttng/tracker.h>
9f449915 47#include <common/string-utils/string-utils.h>
2f77fc4b
DG
48
49#include "channel.h"
50#include "consumer.h"
51#include "event.h"
8782cc74 52#include "health-sessiond.h"
2f77fc4b
DG
53#include "kernel.h"
54#include "kernel-consumer.h"
55#include "lttng-sessiond.h"
56#include "utils.h"
0dbc2034 57#include "lttng-syscall.h"
7c1d2758 58#include "agent.h"
93ec662e 59#include "buffer-registry.h"
b0880ae5
JG
60#include "notification-thread.h"
61#include "notification-thread-commands.h"
5c408ad8
JD
62#include "rotate.h"
63#include "rotation-thread.h"
8e319828 64#include "timer.h"
f28f9e44 65#include "agent-thread.h"
47aa1ca6 66#include "tracker.h"
2f77fc4b
DG
67
68#include "cmd.h"
69
a503e1ef
JG
70/* Sleep for 100ms between each check for the shm path's deletion. */
71#define SESSION_DESTROY_SHM_PATH_CHECK_DELAY_US 100000
72
3e3665b8
JG
73struct cmd_destroy_session_reply_context {
74 int reply_sock_fd;
75 bool implicit_rotation_on_destroy;
3285a971
JG
76 /*
77 * Indicates whether or not an error occurred while launching the
78 * destruction of a session.
79 */
80 enum lttng_error_code destruction_status;
3e3665b8
JG
81};
82
a503e1ef
JG
83static enum lttng_error_code wait_on_path(void *path);
84
85/*
86 * Command completion handler that is used by the destroy command
87 * when a session that has a non-default shm_path is being destroyed.
88 *
89 * See comment in cmd_destroy_session() for the rationale.
90 */
91static struct destroy_completion_handler {
92 struct cmd_completion_handler handler;
93 char shm_path[member_sizeof(struct ltt_session, shm_path)];
94} destroy_completion_handler = {
95 .handler = {
96 .run = wait_on_path,
97 .data = destroy_completion_handler.shm_path
98 },
99 .shm_path = { 0 },
100};
101
102static struct cmd_completion_handler *current_completion_handler;
103
2f77fc4b
DG
104/*
105 * Used to keep a unique index for each relayd socket created where this value
106 * is associated with streams on the consumer so it can match the right relayd
d88aee68
DG
107 * to send to. It must be accessed with the relayd_net_seq_idx_lock
108 * held.
2f77fc4b 109 */
d88aee68
DG
110static pthread_mutex_t relayd_net_seq_idx_lock = PTHREAD_MUTEX_INITIALIZER;
111static uint64_t relayd_net_seq_idx;
2f77fc4b 112
7076b56e
JG
113static int validate_ust_event_name(const char *);
114static int cmd_enable_event_internal(struct ltt_session *session,
df4f5a87 115 const struct lttng_domain *domain,
7076b56e
JG
116 char *channel_name, struct lttng_event *event,
117 char *filter_expression,
118 struct lttng_filter_bytecode *filter,
119 struct lttng_event_exclusion *exclusion,
120 int wpipe);
121
2f77fc4b
DG
122/*
123 * Create a session path used by list_lttng_sessions for the case that the
124 * session consumer is on the network.
125 */
126static int build_network_session_path(char *dst, size_t size,
127 struct ltt_session *session)
128{
129 int ret, kdata_port, udata_port;
130 struct lttng_uri *kuri = NULL, *uuri = NULL, *uri = NULL;
131 char tmp_uurl[PATH_MAX], tmp_urls[PATH_MAX];
132
133 assert(session);
134 assert(dst);
135
136 memset(tmp_urls, 0, sizeof(tmp_urls));
137 memset(tmp_uurl, 0, sizeof(tmp_uurl));
138
139 kdata_port = udata_port = DEFAULT_NETWORK_DATA_PORT;
140
141 if (session->kernel_session && session->kernel_session->consumer) {
142 kuri = &session->kernel_session->consumer->dst.net.control;
143 kdata_port = session->kernel_session->consumer->dst.net.data.port;
144 }
145
146 if (session->ust_session && session->ust_session->consumer) {
147 uuri = &session->ust_session->consumer->dst.net.control;
148 udata_port = session->ust_session->consumer->dst.net.data.port;
149 }
150
151 if (uuri == NULL && kuri == NULL) {
152 uri = &session->consumer->dst.net.control;
153 kdata_port = session->consumer->dst.net.data.port;
154 } else if (kuri && uuri) {
155 ret = uri_compare(kuri, uuri);
156 if (ret) {
157 /* Not Equal */
158 uri = kuri;
159 /* Build uuri URL string */
160 ret = uri_to_str_url(uuri, tmp_uurl, sizeof(tmp_uurl));
161 if (ret < 0) {
162 goto error;
163 }
164 } else {
165 uri = kuri;
166 }
167 } else if (kuri && uuri == NULL) {
168 uri = kuri;
169 } else if (uuri && kuri == NULL) {
170 uri = uuri;
171 }
172
173 ret = uri_to_str_url(uri, tmp_urls, sizeof(tmp_urls));
174 if (ret < 0) {
175 goto error;
176 }
177
9aa9f900
DG
178 /*
179 * Do we have a UST url set. If yes, this means we have both kernel and UST
180 * to print.
181 */
9d035200 182 if (*tmp_uurl != '\0') {
2f77fc4b
DG
183 ret = snprintf(dst, size, "[K]: %s [data: %d] -- [U]: %s [data: %d]",
184 tmp_urls, kdata_port, tmp_uurl, udata_port);
185 } else {
9aa9f900 186 int dport;
bef08707 187 if (kuri || (!kuri && !uuri)) {
9aa9f900
DG
188 dport = kdata_port;
189 } else {
190 /* No kernel URI, use the UST port. */
191 dport = udata_port;
192 }
193 ret = snprintf(dst, size, "%s [data: %d]", tmp_urls, dport);
2f77fc4b
DG
194 }
195
196error:
197 return ret;
198}
199
fb83fe64
JD
200/*
201 * Get run-time attributes if the session has been started (discarded events,
202 * lost packets).
203 */
204static int get_kernel_runtime_stats(struct ltt_session *session,
205 struct ltt_kernel_channel *kchan, uint64_t *discarded_events,
206 uint64_t *lost_packets)
207{
208 int ret;
209
210 if (!session->has_been_started) {
211 ret = 0;
212 *discarded_events = 0;
213 *lost_packets = 0;
214 goto end;
215 }
216
e1f3997a 217 ret = consumer_get_discarded_events(session->id, kchan->key,
fb83fe64
JD
218 session->kernel_session->consumer,
219 discarded_events);
220 if (ret < 0) {
221 goto end;
222 }
223
e1f3997a 224 ret = consumer_get_lost_packets(session->id, kchan->key,
fb83fe64
JD
225 session->kernel_session->consumer,
226 lost_packets);
227 if (ret < 0) {
228 goto end;
229 }
230
231end:
232 return ret;
233}
234
235/*
236 * Get run-time attributes if the session has been started (discarded events,
237 * lost packets).
238 */
239static int get_ust_runtime_stats(struct ltt_session *session,
240 struct ltt_ust_channel *uchan, uint64_t *discarded_events,
241 uint64_t *lost_packets)
242{
243 int ret;
244 struct ltt_ust_session *usess;
245
a91c5803
JG
246 if (!discarded_events || !lost_packets) {
247 ret = -1;
248 goto end;
249 }
250
fb83fe64 251 usess = session->ust_session;
a905c624
JG
252 assert(discarded_events);
253 assert(lost_packets);
fb83fe64
JD
254
255 if (!usess || !session->has_been_started) {
256 *discarded_events = 0;
257 *lost_packets = 0;
258 ret = 0;
259 goto end;
260 }
261
262 if (usess->buffer_type == LTTNG_BUFFER_PER_UID) {
263 ret = ust_app_uid_get_channel_runtime_stats(usess->id,
264 &usess->buffer_reg_uid_list,
265 usess->consumer, uchan->id,
266 uchan->attr.overwrite,
267 discarded_events,
268 lost_packets);
269 } else if (usess->buffer_type == LTTNG_BUFFER_PER_PID) {
270 ret = ust_app_pid_get_channel_runtime_stats(usess,
271 uchan, usess->consumer,
272 uchan->attr.overwrite,
273 discarded_events,
274 lost_packets);
275 if (ret < 0) {
276 goto end;
277 }
278 *discarded_events += uchan->per_pid_closed_app_discarded;
279 *lost_packets += uchan->per_pid_closed_app_lost;
280 } else {
281 ERR("Unsupported buffer type");
967bc289 282 assert(0);
fb83fe64
JD
283 ret = -1;
284 goto end;
285 }
286
287end:
288 return ret;
289}
290
2f77fc4b
DG
291/*
292 * Fill lttng_channel array of all channels.
293 */
d449df4a 294static ssize_t list_lttng_channels(enum lttng_domain_type domain,
fb83fe64 295 struct ltt_session *session, struct lttng_channel *channels,
cf0bcb51 296 struct lttng_channel_extended *chan_exts)
2f77fc4b 297{
d449df4a 298 int i = 0, ret = 0;
2f77fc4b
DG
299 struct ltt_kernel_channel *kchan;
300
301 DBG("Listing channels for session %s", session->name);
302
303 switch (domain) {
304 case LTTNG_DOMAIN_KERNEL:
305 /* Kernel channels */
306 if (session->kernel_session != NULL) {
307 cds_list_for_each_entry(kchan,
308 &session->kernel_session->channel_list.head, list) {
fb83fe64 309 uint64_t discarded_events, lost_packets;
cf0bcb51
JG
310 struct lttng_channel_extended *extended;
311
312 extended = (struct lttng_channel_extended *)
313 kchan->channel->attr.extended.ptr;
fb83fe64
JD
314
315 ret = get_kernel_runtime_stats(session, kchan,
316 &discarded_events, &lost_packets);
317 if (ret < 0) {
318 goto end;
319 }
2f77fc4b
DG
320 /* Copy lttng_channel struct to array */
321 memcpy(&channels[i], kchan->channel, sizeof(struct lttng_channel));
322 channels[i].enabled = kchan->enabled;
fb83fe64
JD
323 chan_exts[i].discarded_events =
324 discarded_events;
325 chan_exts[i].lost_packets = lost_packets;
cf0bcb51
JG
326 chan_exts[i].monitor_timer_interval =
327 extended->monitor_timer_interval;
491d1539 328 chan_exts[i].blocking_timeout = 0;
2f77fc4b
DG
329 i++;
330 }
331 }
332 break;
333 case LTTNG_DOMAIN_UST:
334 {
335 struct lttng_ht_iter iter;
336 struct ltt_ust_channel *uchan;
337
e7fe706f 338 rcu_read_lock();
2f77fc4b
DG
339 cds_lfht_for_each_entry(session->ust_session->domain_global.channels->ht,
340 &iter.iter, uchan, node.node) {
a91c5803 341 uint64_t discarded_events = 0, lost_packets = 0;
fb83fe64 342
8ee609c8
MD
343 if (lttng_strncpy(channels[i].name, uchan->name,
344 LTTNG_SYMBOL_NAME_LEN)) {
345 break;
346 }
2f77fc4b
DG
347 channels[i].attr.overwrite = uchan->attr.overwrite;
348 channels[i].attr.subbuf_size = uchan->attr.subbuf_size;
349 channels[i].attr.num_subbuf = uchan->attr.num_subbuf;
350 channels[i].attr.switch_timer_interval =
351 uchan->attr.switch_timer_interval;
352 channels[i].attr.read_timer_interval =
353 uchan->attr.read_timer_interval;
354 channels[i].enabled = uchan->enabled;
2f785fe7
DG
355 channels[i].attr.tracefile_size = uchan->tracefile_size;
356 channels[i].attr.tracefile_count = uchan->tracefile_count;
5e4435a4
JG
357
358 /*
359 * Map enum lttng_ust_output to enum lttng_event_output.
360 */
2f77fc4b
DG
361 switch (uchan->attr.output) {
362 case LTTNG_UST_MMAP:
2f77fc4b
DG
363 channels[i].attr.output = LTTNG_EVENT_MMAP;
364 break;
5e4435a4
JG
365 default:
366 /*
367 * LTTNG_UST_MMAP is the only supported UST
368 * output mode.
369 */
370 assert(0);
371 break;
2f77fc4b 372 }
fb83fe64 373
d449df4a
MD
374 chan_exts[i].monitor_timer_interval =
375 uchan->monitor_timer_interval;
491d1539
MD
376 chan_exts[i].blocking_timeout =
377 uchan->attr.u.s.blocking_timeout;
d449df4a 378
fb83fe64
JD
379 ret = get_ust_runtime_stats(session, uchan,
380 &discarded_events, &lost_packets);
381 if (ret < 0) {
382 break;
383 }
384 chan_exts[i].discarded_events = discarded_events;
385 chan_exts[i].lost_packets = lost_packets;
2f77fc4b
DG
386 i++;
387 }
e7fe706f 388 rcu_read_unlock();
2f77fc4b
DG
389 break;
390 }
391 default:
392 break;
393 }
fb83fe64
JD
394
395end:
d449df4a
MD
396 if (ret < 0) {
397 return -LTTNG_ERR_FATAL;
398 } else {
399 return LTTNG_OK;
400 }
2f77fc4b
DG
401}
402
3c02e545
FD
403static int append_extended_info(const char *filter_expression,
404 struct lttng_event_exclusion *exclusion,
405 struct lttng_userspace_probe_location *probe_location,
e368fb43 406 struct lttng_payload *payload)
b4e3ceb9 407{
3c02e545 408 int ret = 0;
b4e3ceb9 409 size_t filter_len = 0;
795d57ce 410 size_t nb_exclusions = 0;
3c02e545 411 size_t userspace_probe_location_len = 0;
e368fb43
JG
412 struct lttcomm_event_extended_header extended_header = {};
413 struct lttcomm_event_extended_header *p_extended_header;
414 const size_t original_payload_size = payload->buffer.size;
415
416 ret = lttng_dynamic_buffer_append(&payload->buffer, &extended_header,
417 sizeof(extended_header));
418 if (ret) {
419 goto end;
420 }
b4e3ceb9
PP
421
422 if (filter_expression) {
423 filter_len = strlen(filter_expression) + 1;
e368fb43
JG
424 ret = lttng_dynamic_buffer_append(&payload->buffer,
425 filter_expression, filter_len);
426 if (ret) {
427 goto end;
428 }
b4e3ceb9
PP
429 }
430
795d57ce 431 if (exclusion) {
e368fb43
JG
432 const size_t len = exclusion->count * LTTNG_SYMBOL_NAME_LEN;
433
795d57ce 434 nb_exclusions = exclusion->count;
e368fb43
JG
435
436 ret = lttng_dynamic_buffer_append(
437 &payload->buffer, &exclusion->names, len);
438 if (ret) {
439 goto end;
440 }
795d57ce
PP
441 }
442
3c02e545 443 if (probe_location) {
e368fb43
JG
444 const size_t size_before_probe = payload->buffer.size;
445
3c02e545 446 ret = lttng_userspace_probe_location_serialize(probe_location,
e368fb43 447 payload);
3c02e545
FD
448 if (ret < 0) {
449 ret = -1;
450 goto end;
451 }
795d57ce 452
e368fb43
JG
453 userspace_probe_location_len =
454 payload->buffer.size - size_before_probe;
795d57ce
PP
455 }
456
e368fb43
JG
457 /* Set header fields */
458 p_extended_header = (struct lttcomm_event_extended_header *)
459 (payload->buffer.data + original_payload_size);
795d57ce 460
e368fb43
JG
461 p_extended_header->filter_len = filter_len;
462 p_extended_header->nb_exclusions = nb_exclusions;
463 p_extended_header->userspace_probe_location_len =
464 userspace_probe_location_len;
3c02e545 465
3c02e545
FD
466 ret = 0;
467end:
468 return ret;
b4e3ceb9
PP
469}
470
3c6a091f 471/*
022d91ba 472 * Create a list of agent domain events.
3c6a091f
DG
473 *
474 * Return number of events in list on success or else a negative value.
475 */
022d91ba 476static int list_lttng_agent_events(struct agent *agt,
e368fb43 477 struct lttng_payload *payload)
3c6a091f 478{
e368fb43
JG
479 int nb_events = 0, ret = 0;
480 const struct agent_event *agent_event;
3c6a091f
DG
481 struct lttng_ht_iter iter;
482
022d91ba 483 assert(agt);
3c6a091f 484
022d91ba 485 DBG3("Listing agent events");
3c6a091f 486
e5bbf678 487 rcu_read_lock();
e368fb43
JG
488 cds_lfht_for_each_entry (
489 agt->events->ht, &iter.iter, agent_event, node.node) {
490 struct lttng_event event = {
44760c20 491 .enabled = AGENT_EVENT_IS_ENABLED(agent_event),
e368fb43
JG
492 .loglevel = agent_event->loglevel_value,
493 .loglevel_type = agent_event->loglevel_type,
494 };
495
43ed1485
JG
496 ret = lttng_strncpy(event.name, agent_event->name, sizeof(event.name));
497 if (ret) {
498 /* Internal error, invalid name. */
499 ERR("Invalid event name while listing agent events: '%s' exceeds the maximal allowed length of %zu bytes",
500 agent_event->name, sizeof(event.name));
501 ret = -LTTNG_ERR_UNK;
502 goto end;
503 }
e368fb43
JG
504
505 ret = lttng_dynamic_buffer_append(
506 &payload->buffer, &event, sizeof(event));
3c02e545 507 if (ret) {
e368fb43
JG
508 ERR("Failed to append event to payload");
509 ret = -LTTNG_ERR_NOMEM;
510 goto end;
3c02e545 511 }
b4e3ceb9 512
e368fb43 513 nb_events++;
3c6a091f
DG
514 }
515
e368fb43
JG
516 cds_lfht_for_each_entry (
517 agt->events->ht, &iter.iter, agent_event, node.node) {
518 /* Append extended info. */
519 ret = append_extended_info(agent_event->filter_expression, NULL,
520 NULL, payload);
3c02e545 521 if (ret) {
e368fb43
JG
522 ERR("Failed to append extended event info to payload");
523 ret = -LTTNG_ERR_NOMEM;
524 goto end;
3c02e545 525 }
3c6a091f 526 }
3c6a091f 527
e368fb43 528 ret = nb_events;
47e52862 529end:
3c02e545 530 rcu_read_unlock();
3c6a091f
DG
531 return ret;
532}
533
2f77fc4b
DG
534/*
535 * Create a list of ust global domain events.
536 */
537static int list_lttng_ust_global_events(char *channel_name,
b4e3ceb9 538 struct ltt_ust_domain_global *ust_global,
e368fb43 539 struct lttng_payload *payload)
2f77fc4b 540{
e368fb43
JG
541 int ret = 0;
542 unsigned int nb_events = 0;
2f77fc4b 543 struct lttng_ht_iter iter;
e368fb43
JG
544 const struct lttng_ht_node_str *node;
545 const struct ltt_ust_channel *uchan;
546 const struct ltt_ust_event *uevent;
2f77fc4b
DG
547
548 DBG("Listing UST global events for channel %s", channel_name);
549
550 rcu_read_lock();
551
e368fb43 552 lttng_ht_lookup(ust_global->channels, (void *) channel_name, &iter);
2f77fc4b
DG
553 node = lttng_ht_iter_get_node_str(&iter);
554 if (node == NULL) {
f73fabfd 555 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
d31d3e8c 556 goto end;
2f77fc4b
DG
557 }
558
559 uchan = caa_container_of(&node->node, struct ltt_ust_channel, node.node);
560
e368fb43 561 DBG3("Listing UST global events");
2f77fc4b 562
b4e3ceb9 563 cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) {
e368fb43
JG
564 struct lttng_event event = {};
565
b4e3ceb9 566 if (uevent->internal) {
b4e3ceb9
PP
567 continue;
568 }
569
43ed1485
JG
570 ret = lttng_strncpy(event.name, uevent->attr.name, sizeof(event.name));
571 if (ret) {
572 /* Internal error, invalid name. */
573 ERR("Invalid event name while listing user space tracer events: '%s' exceeds the maximal allowed length of %zu bytes",
574 uevent->attr.name, sizeof(event.name));
575 ret = -LTTNG_ERR_UNK;
576 goto end;
577 }
2f77fc4b 578
e368fb43 579 event.enabled = uevent->enabled;
2f77fc4b
DG
580
581 switch (uevent->attr.instrumentation) {
582 case LTTNG_UST_TRACEPOINT:
e368fb43 583 event.type = LTTNG_EVENT_TRACEPOINT;
2f77fc4b
DG
584 break;
585 case LTTNG_UST_PROBE:
e368fb43 586 event.type = LTTNG_EVENT_PROBE;
2f77fc4b
DG
587 break;
588 case LTTNG_UST_FUNCTION:
e368fb43 589 event.type = LTTNG_EVENT_FUNCTION;
2f77fc4b
DG
590 break;
591 }
592
e368fb43 593 event.loglevel = uevent->attr.loglevel;
2f77fc4b
DG
594 switch (uevent->attr.loglevel_type) {
595 case LTTNG_UST_LOGLEVEL_ALL:
e368fb43 596 event.loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL;
2f77fc4b
DG
597 break;
598 case LTTNG_UST_LOGLEVEL_RANGE:
e368fb43 599 event.loglevel_type = LTTNG_EVENT_LOGLEVEL_RANGE;
2f77fc4b
DG
600 break;
601 case LTTNG_UST_LOGLEVEL_SINGLE:
e368fb43 602 event.loglevel_type = LTTNG_EVENT_LOGLEVEL_SINGLE;
2f77fc4b
DG
603 break;
604 }
e368fb43 605
2f77fc4b 606 if (uevent->filter) {
e368fb43 607 event.filter = 1;
2f77fc4b 608 }
e368fb43 609
4634f12e 610 if (uevent->exclusion) {
e368fb43
JG
611 event.exclusion = 1;
612 }
613
614 ret = lttng_dynamic_buffer_append(&payload->buffer, &event, sizeof(event));
615 if (ret) {
616 ERR("Failed to append event to payload");
617 ret = -LTTNG_ERR_NOMEM;
618 goto end;
4634f12e 619 }
b4e3ceb9 620
e368fb43
JG
621 nb_events++;
622 }
623
624 cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) {
625 /* Append extended info. */
3c02e545 626 ret = append_extended_info(uevent->filter_expression,
e368fb43 627 uevent->exclusion, NULL, payload);
3c02e545 628 if (ret) {
e368fb43 629 ERR("Failed to append extended event info to payload");
3c02e545
FD
630 ret = -LTTNG_ERR_FATAL;
631 goto end;
632 }
2f77fc4b
DG
633 }
634
e368fb43 635 ret = nb_events;
d31d3e8c 636end:
2f77fc4b
DG
637 rcu_read_unlock();
638 return ret;
639}
640
641/*
642 * Fill lttng_event array of all kernel events in the channel.
643 */
644static int list_lttng_kernel_events(char *channel_name,
b4e3ceb9 645 struct ltt_kernel_session *kernel_session,
e368fb43 646 struct lttng_payload *payload)
2f77fc4b 647{
e368fb43 648 int ret;
2f77fc4b 649 unsigned int nb_event;
e368fb43
JG
650 const struct ltt_kernel_event *kevent;
651 const struct ltt_kernel_channel *kchan;
2f77fc4b
DG
652
653 kchan = trace_kernel_get_channel_by_name(channel_name, kernel_session);
654 if (kchan == NULL) {
f73fabfd 655 ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND;
2f77fc4b
DG
656 goto error;
657 }
658
659 nb_event = kchan->event_count;
660
661 DBG("Listing events for channel %s", kchan->channel->name);
662
e368fb43
JG
663 /* Kernel channels */
664 cds_list_for_each_entry(kevent, &kchan->events_list.head , list) {
665 struct lttng_event event = {};
2f77fc4b 666
43ed1485
JG
667 ret = lttng_strncpy(event.name, kevent->event->name, sizeof(event.name));
668 if (ret) {
669 /* Internal error, invalid name. */
670 ERR("Invalid event name while listing kernel events: '%s' exceeds the maximal allowed length of %zu bytes",
671 kevent->event->name,
672 sizeof(event.name));
673 ret = -LTTNG_ERR_UNK;
674 goto end;
675 }
676
e368fb43
JG
677 event.enabled = kevent->enabled;
678 event.filter = (unsigned char) !!kevent->filter_expression;
b4e3ceb9 679
e368fb43 680 switch (kevent->event->instrumentation) {
2f77fc4b 681 case LTTNG_KERNEL_TRACEPOINT:
e368fb43 682 event.type = LTTNG_EVENT_TRACEPOINT;
2f77fc4b 683 break;
2f77fc4b 684 case LTTNG_KERNEL_KRETPROBE:
e368fb43
JG
685 event.type = LTTNG_EVENT_FUNCTION;
686 memcpy(&event.attr.probe, &kevent->event->u.kprobe,
1896972b
DG
687 sizeof(struct lttng_kernel_kprobe));
688 break;
689 case LTTNG_KERNEL_KPROBE:
e368fb43
JG
690 event.type = LTTNG_EVENT_PROBE;
691 memcpy(&event.attr.probe, &kevent->event->u.kprobe,
2f77fc4b
DG
692 sizeof(struct lttng_kernel_kprobe));
693 break;
b955b4d4 694 case LTTNG_KERNEL_UPROBE:
e368fb43 695 event.type = LTTNG_EVENT_USERSPACE_PROBE;
b955b4d4 696 break;
2f77fc4b 697 case LTTNG_KERNEL_FUNCTION:
e368fb43
JG
698 event.type = LTTNG_EVENT_FUNCTION;
699 memcpy(&event.attr.ftrace, &kevent->event->u.ftrace,
2f77fc4b
DG
700 sizeof(struct lttng_kernel_function));
701 break;
702 case LTTNG_KERNEL_NOOP:
e368fb43 703 event.type = LTTNG_EVENT_NOOP;
2f77fc4b
DG
704 break;
705 case LTTNG_KERNEL_SYSCALL:
e368fb43 706 event.type = LTTNG_EVENT_SYSCALL;
2f77fc4b
DG
707 break;
708 case LTTNG_KERNEL_ALL:
1ab8c2ad
FD
709 /* fall-through. */
710 default:
2f77fc4b
DG
711 assert(0);
712 break;
713 }
b4e3ceb9 714
e368fb43
JG
715 ret = lttng_dynamic_buffer_append(
716 &payload->buffer, &event, sizeof(event));
717 if (ret) {
718 ERR("Failed to append event to payload");
719 ret = -LTTNG_ERR_NOMEM;
720 goto end;
721 }
722 }
723
724 cds_list_for_each_entry(kevent, &kchan->events_list.head , list) {
725 /* Append extended info. */
726 ret = append_extended_info(kevent->filter_expression, NULL,
727 kevent->userspace_probe_location, payload);
3c02e545
FD
728 if (ret) {
729 DBG("Error appending extended info message");
730 ret = -LTTNG_ERR_FATAL;
731 goto error;
732 }
2f77fc4b
DG
733 }
734
db906c12 735end:
2f77fc4b 736 return nb_event;
2f77fc4b 737error:
6314496f 738 return ret;
2f77fc4b
DG
739}
740
741/*
742 * Add URI so the consumer output object. Set the correct path depending on the
743 * domain adding the default trace directory.
744 */
b178f53e
JG
745static enum lttng_error_code add_uri_to_consumer(
746 const struct ltt_session *session,
747 struct consumer_output *consumer,
748 struct lttng_uri *uri, enum lttng_domain_type domain)
2f77fc4b 749{
b178f53e
JG
750 int ret;
751 enum lttng_error_code ret_code = LTTNG_OK;
2f77fc4b
DG
752
753 assert(uri);
754
755 if (consumer == NULL) {
756 DBG("No consumer detected. Don't add URI. Stopping.");
b178f53e 757 ret_code = LTTNG_ERR_NO_CONSUMER;
2f77fc4b
DG
758 goto error;
759 }
760
761 switch (domain) {
762 case LTTNG_DOMAIN_KERNEL:
b178f53e
JG
763 ret = lttng_strncpy(consumer->domain_subdir,
764 DEFAULT_KERNEL_TRACE_DIR,
765 sizeof(consumer->domain_subdir));
2f77fc4b
DG
766 break;
767 case LTTNG_DOMAIN_UST:
b178f53e
JG
768 ret = lttng_strncpy(consumer->domain_subdir,
769 DEFAULT_UST_TRACE_DIR,
770 sizeof(consumer->domain_subdir));
2f77fc4b
DG
771 break;
772 default:
773 /*
b178f53e
JG
774 * This case is possible is we try to add the URI to the global
775 * tracing session consumer object which in this case there is
776 * no subdir.
2f77fc4b 777 */
b178f53e
JG
778 memset(consumer->domain_subdir, 0,
779 sizeof(consumer->domain_subdir));
780 ret = 0;
781 }
782 if (ret) {
783 ERR("Failed to initialize consumer output domain subdirectory");
784 ret_code = LTTNG_ERR_FATAL;
785 goto error;
2f77fc4b
DG
786 }
787
788 switch (uri->dtype) {
789 case LTTNG_DST_IPV4:
790 case LTTNG_DST_IPV6:
791 DBG2("Setting network URI to consumer");
792
df75acac
DG
793 if (consumer->type == CONSUMER_DST_NET) {
794 if ((uri->stype == LTTNG_STREAM_CONTROL &&
785d2d0d
DG
795 consumer->dst.net.control_isset) ||
796 (uri->stype == LTTNG_STREAM_DATA &&
797 consumer->dst.net.data_isset)) {
b178f53e 798 ret_code = LTTNG_ERR_URL_EXIST;
df75acac
DG
799 goto error;
800 }
801 } else {
b178f53e 802 memset(&consumer->dst, 0, sizeof(consumer->dst));
785d2d0d
DG
803 }
804
2f77fc4b 805 /* Set URI into consumer output object */
b178f53e 806 ret = consumer_set_network_uri(session, consumer, uri);
2f77fc4b 807 if (ret < 0) {
b178f53e 808 ret_code = -ret;
2f77fc4b
DG
809 goto error;
810 } else if (ret == 1) {
811 /*
812 * URI was the same in the consumer so we do not append the subdir
813 * again so to not duplicate output dir.
814 */
b178f53e 815 ret_code = LTTNG_OK;
2f77fc4b
DG
816 goto error;
817 }
2f77fc4b
DG
818 break;
819 case LTTNG_DST_PATH:
b178f53e
JG
820 if (*uri->dst.path != '/' || strstr(uri->dst.path, "../")) {
821 ret_code = LTTNG_ERR_INVALID;
9ac05d92
MD
822 goto error;
823 }
b178f53e
JG
824 DBG2("Setting trace directory path from URI to %s",
825 uri->dst.path);
826 memset(&consumer->dst, 0, sizeof(consumer->dst));
827
828 ret = lttng_strncpy(consumer->dst.session_root_path,
829 uri->dst.path,
830 sizeof(consumer->dst.session_root_path));
4df41cad
JG
831 if (ret) {
832 ret_code = LTTNG_ERR_FATAL;
833 goto error;
834 }
2f77fc4b
DG
835 consumer->type = CONSUMER_DST_LOCAL;
836 break;
837 }
838
b178f53e 839 ret_code = LTTNG_OK;
2f77fc4b 840error:
b178f53e 841 return ret_code;
2f77fc4b
DG
842}
843
844/*
845 * Init tracing by creating trace directory and sending fds kernel consumer.
846 */
847static int init_kernel_tracing(struct ltt_kernel_session *session)
848{
849 int ret = 0;
850 struct lttng_ht_iter iter;
851 struct consumer_socket *socket;
852
853 assert(session);
854
e7fe706f
DG
855 rcu_read_lock();
856
2f77fc4b
DG
857 if (session->consumer_fds_sent == 0 && session->consumer != NULL) {
858 cds_lfht_for_each_entry(session->consumer->socks->ht, &iter.iter,
859 socket, node.node) {
2f77fc4b 860 pthread_mutex_lock(socket->lock);
f50f23d9 861 ret = kernel_consumer_send_session(socket, session);
2f77fc4b
DG
862 pthread_mutex_unlock(socket->lock);
863 if (ret < 0) {
f73fabfd 864 ret = LTTNG_ERR_KERN_CONSUMER_FAIL;
2f77fc4b
DG
865 goto error;
866 }
867 }
868 }
869
870error:
e7fe706f 871 rcu_read_unlock();
2f77fc4b
DG
872 return ret;
873}
874
875/*
876 * Create a socket to the relayd using the URI.
877 *
878 * On success, the relayd_sock pointer is set to the created socket.
9a654598 879 * Else, it remains untouched and an LTTng error code is returned.
2f77fc4b 880 */
9a654598 881static enum lttng_error_code create_connect_relayd(struct lttng_uri *uri,
b31610f2
JD
882 struct lttcomm_relayd_sock **relayd_sock,
883 struct consumer_output *consumer)
2f77fc4b
DG
884{
885 int ret;
9a654598 886 enum lttng_error_code status = LTTNG_OK;
6151a90f 887 struct lttcomm_relayd_sock *rsock;
2f77fc4b 888
6151a90f
JD
889 rsock = lttcomm_alloc_relayd_sock(uri, RELAYD_VERSION_COMM_MAJOR,
890 RELAYD_VERSION_COMM_MINOR);
891 if (!rsock) {
9a654598 892 status = LTTNG_ERR_FATAL;
2f77fc4b
DG
893 goto error;
894 }
895
ffe60014
DG
896 /*
897 * Connect to relayd so we can proceed with a session creation. This call
898 * can possibly block for an arbitrary amount of time to set the health
899 * state to be in poll execution.
900 */
901 health_poll_entry();
6151a90f 902 ret = relayd_connect(rsock);
ffe60014 903 health_poll_exit();
2f77fc4b
DG
904 if (ret < 0) {
905 ERR("Unable to reach lttng-relayd");
9a654598 906 status = LTTNG_ERR_RELAYD_CONNECT_FAIL;
2f77fc4b
DG
907 goto free_sock;
908 }
909
910 /* Create socket for control stream. */
911 if (uri->stype == LTTNG_STREAM_CONTROL) {
eacb7b6f
MD
912 uint64_t result_flags;
913
2f77fc4b
DG
914 DBG3("Creating relayd stream socket from URI");
915
916 /* Check relayd version */
6151a90f 917 ret = relayd_version_check(rsock);
67d5aa28 918 if (ret == LTTNG_ERR_RELAYD_VERSION_FAIL) {
9a654598 919 status = LTTNG_ERR_RELAYD_VERSION_FAIL;
67d5aa28
JD
920 goto close_sock;
921 } else if (ret < 0) {
922 ERR("Unable to reach lttng-relayd");
9a654598 923 status = LTTNG_ERR_RELAYD_CONNECT_FAIL;
2f77fc4b
DG
924 goto close_sock;
925 }
b31610f2
JD
926 consumer->relay_major_version = rsock->major;
927 consumer->relay_minor_version = rsock->minor;
eacb7b6f
MD
928 ret = relayd_get_configuration(rsock, 0,
929 &result_flags);
930 if (ret < 0) {
931 ERR("Unable to get relayd configuration");
932 status = LTTNG_ERR_RELAYD_CONNECT_FAIL;
933 goto close_sock;
934 }
935 if (result_flags & LTTCOMM_RELAYD_CONFIGURATION_FLAG_CLEAR_ALLOWED) {
936 consumer->relay_allows_clear = true;
937 }
2f77fc4b
DG
938 } else if (uri->stype == LTTNG_STREAM_DATA) {
939 DBG3("Creating relayd data socket from URI");
940 } else {
941 /* Command is not valid */
942 ERR("Relayd invalid stream type: %d", uri->stype);
9a654598 943 status = LTTNG_ERR_INVALID;
2f77fc4b
DG
944 goto close_sock;
945 }
946
6151a90f 947 *relayd_sock = rsock;
2f77fc4b 948
9a654598 949 return status;
2f77fc4b
DG
950
951close_sock:
6151a90f
JD
952 /* The returned value is not useful since we are on an error path. */
953 (void) relayd_close(rsock);
2f77fc4b 954free_sock:
6151a90f 955 free(rsock);
2f77fc4b 956error:
9a654598 957 return status;
2f77fc4b
DG
958}
959
960/*
961 * Connect to the relayd using URI and send the socket to the right consumer.
43fade62
JG
962 *
963 * The consumer socket lock must be held by the caller.
9a654598
JG
964 *
965 * Returns LTTNG_OK on success or an LTTng error code on failure.
2f77fc4b 966 */
9a654598
JG
967static enum lttng_error_code send_consumer_relayd_socket(
968 unsigned int session_id,
3044f922 969 struct lttng_uri *relayd_uri,
56a37563 970 struct consumer_output *consumer,
d3e2ba59 971 struct consumer_socket *consumer_sock,
fb9a95c4 972 const char *session_name, const char *hostname,
6fa5fe7c 973 const char *base_path, int session_live_timer,
0e270a1e 974 const uint64_t *current_chunk_id,
46ef2188
MD
975 time_t session_creation_time,
976 bool session_name_contains_creation_time)
2f77fc4b
DG
977{
978 int ret;
6151a90f 979 struct lttcomm_relayd_sock *rsock = NULL;
9a654598 980 enum lttng_error_code status;
2f77fc4b 981
ffe60014 982 /* Connect to relayd and make version check if uri is the control. */
9a654598
JG
983 status = create_connect_relayd(relayd_uri, &rsock, consumer);
984 if (status != LTTNG_OK) {
9e218353 985 goto relayd_comm_error;
ffe60014 986 }
6151a90f 987 assert(rsock);
ffe60014 988
2f77fc4b 989 /* Set the network sequence index if not set. */
d88aee68
DG
990 if (consumer->net_seq_index == (uint64_t) -1ULL) {
991 pthread_mutex_lock(&relayd_net_seq_idx_lock);
2f77fc4b
DG
992 /*
993 * Increment net_seq_idx because we are about to transfer the
994 * new relayd socket to the consumer.
d88aee68 995 * Assign unique key so the consumer can match streams.
2f77fc4b 996 */
d88aee68
DG
997 consumer->net_seq_index = ++relayd_net_seq_idx;
998 pthread_mutex_unlock(&relayd_net_seq_idx_lock);
2f77fc4b
DG
999 }
1000
2f77fc4b 1001 /* Send relayd socket to consumer. */
6151a90f 1002 ret = consumer_send_relayd_socket(consumer_sock, rsock, consumer,
d3e2ba59 1003 relayd_uri->stype, session_id,
6fa5fe7c
MD
1004 session_name, hostname, base_path,
1005 session_live_timer, current_chunk_id,
46ef2188 1006 session_creation_time, session_name_contains_creation_time);
2f77fc4b 1007 if (ret < 0) {
9a654598 1008 status = LTTNG_ERR_ENABLE_CONSUMER_FAIL;
2f77fc4b
DG
1009 goto close_sock;
1010 }
1011
c890b720
DG
1012 /* Flag that the corresponding socket was sent. */
1013 if (relayd_uri->stype == LTTNG_STREAM_CONTROL) {
ffe60014 1014 consumer_sock->control_sock_sent = 1;
c890b720 1015 } else if (relayd_uri->stype == LTTNG_STREAM_DATA) {
ffe60014 1016 consumer_sock->data_sock_sent = 1;
c890b720
DG
1017 }
1018
2f77fc4b
DG
1019 /*
1020 * Close socket which was dup on the consumer side. The session daemon does
1021 * NOT keep track of the relayd socket(s) once transfer to the consumer.
1022 */
1023
1024close_sock:
9a654598 1025 if (status != LTTNG_OK) {
ffe60014 1026 /*
d9078d0c
DG
1027 * The consumer output for this session should not be used anymore
1028 * since the relayd connection failed thus making any tracing or/and
1029 * streaming not usable.
ffe60014 1030 */
d9078d0c 1031 consumer->enabled = 0;
ffe60014 1032 }
9e218353
JR
1033 (void) relayd_close(rsock);
1034 free(rsock);
1035
1036relayd_comm_error:
9a654598 1037 return status;
2f77fc4b
DG
1038}
1039
1040/*
1041 * Send both relayd sockets to a specific consumer and domain. This is a
1042 * helper function to facilitate sending the information to the consumer for a
1043 * session.
43fade62
JG
1044 *
1045 * The consumer socket lock must be held by the caller.
9a654598
JG
1046 *
1047 * Returns LTTNG_OK, or an LTTng error code on failure.
2f77fc4b 1048 */
9a654598
JG
1049static enum lttng_error_code send_consumer_relayd_sockets(
1050 enum lttng_domain_type domain,
56a37563 1051 unsigned int session_id, struct consumer_output *consumer,
fb9a95c4 1052 struct consumer_socket *sock, const char *session_name,
6fa5fe7c 1053 const char *hostname, const char *base_path, int session_live_timer,
46ef2188
MD
1054 const uint64_t *current_chunk_id, time_t session_creation_time,
1055 bool session_name_contains_creation_time)
2f77fc4b 1056{
9a654598 1057 enum lttng_error_code status = LTTNG_OK;
2f77fc4b 1058
2f77fc4b 1059 assert(consumer);
6dc3064a 1060 assert(sock);
2f77fc4b 1061
2f77fc4b 1062 /* Sending control relayd socket. */
ffe60014 1063 if (!sock->control_sock_sent) {
9a654598 1064 status = send_consumer_relayd_socket(session_id,
d3e2ba59 1065 &consumer->dst.net.control, consumer, sock,
6fa5fe7c 1066 session_name, hostname, base_path, session_live_timer,
46ef2188
MD
1067 current_chunk_id, session_creation_time,
1068 session_name_contains_creation_time);
9a654598 1069 if (status != LTTNG_OK) {
c890b720
DG
1070 goto error;
1071 }
2f77fc4b
DG
1072 }
1073
1074 /* Sending data relayd socket. */
ffe60014 1075 if (!sock->data_sock_sent) {
9a654598 1076 status = send_consumer_relayd_socket(session_id,
d3e2ba59 1077 &consumer->dst.net.data, consumer, sock,
6fa5fe7c 1078 session_name, hostname, base_path, session_live_timer,
46ef2188
MD
1079 current_chunk_id, session_creation_time,
1080 session_name_contains_creation_time);
9a654598 1081 if (status != LTTNG_OK) {
c890b720
DG
1082 goto error;
1083 }
2f77fc4b
DG
1084 }
1085
2f77fc4b 1086error:
9a654598 1087 return status;
2f77fc4b
DG
1088}
1089
1090/*
1091 * Setup relayd connections for a tracing session. First creates the socket to
1092 * the relayd and send them to the right domain consumer. Consumer type MUST be
1093 * network.
1094 */
ffe60014 1095int cmd_setup_relayd(struct ltt_session *session)
2f77fc4b 1096{
f73fabfd 1097 int ret = LTTNG_OK;
2f77fc4b
DG
1098 struct ltt_ust_session *usess;
1099 struct ltt_kernel_session *ksess;
1100 struct consumer_socket *socket;
1101 struct lttng_ht_iter iter;
0e270a1e 1102 LTTNG_OPTIONAL(uint64_t) current_chunk_id = {};
2f77fc4b 1103
0e270a1e 1104 assert(session);
2f77fc4b
DG
1105
1106 usess = session->ust_session;
1107 ksess = session->kernel_session;
1108
785d2d0d 1109 DBG("Setting relayd for session %s", session->name);
2f77fc4b 1110
aa997ea3 1111 rcu_read_lock();
1e791a74
JG
1112 if (session->current_trace_chunk) {
1113 enum lttng_trace_chunk_status status = lttng_trace_chunk_get_id(
1114 session->current_trace_chunk, &current_chunk_id.value);
1115
1116 if (status == LTTNG_TRACE_CHUNK_STATUS_OK) {
1117 current_chunk_id.is_set = true;
1118 } else {
1119 ERR("Failed to get current trace chunk id");
1120 ret = LTTNG_ERR_UNK;
1121 goto error;
1122 }
1123 }
1124
2f77fc4b
DG
1125 if (usess && usess->consumer && usess->consumer->type == CONSUMER_DST_NET
1126 && usess->consumer->enabled) {
1127 /* For each consumer socket, send relayd sockets */
1128 cds_lfht_for_each_entry(usess->consumer->socks->ht, &iter.iter,
1129 socket, node.node) {
2f77fc4b 1130 pthread_mutex_lock(socket->lock);
6dc3064a 1131 ret = send_consumer_relayd_sockets(LTTNG_DOMAIN_UST, session->id,
d3e2ba59
JD
1132 usess->consumer, socket,
1133 session->name, session->hostname,
6fa5fe7c 1134 session->base_path,
1e791a74 1135 session->live_timer,
db1da059 1136 current_chunk_id.is_set ? &current_chunk_id.value : NULL,
46ef2188
MD
1137 session->creation_time,
1138 session->name_contains_creation_time);
2f77fc4b 1139 pthread_mutex_unlock(socket->lock);
f73fabfd 1140 if (ret != LTTNG_OK) {
2f77fc4b
DG
1141 goto error;
1142 }
6dc3064a
DG
1143 /* Session is now ready for network streaming. */
1144 session->net_handle = 1;
2f77fc4b 1145 }
b31610f2
JD
1146 session->consumer->relay_major_version =
1147 usess->consumer->relay_major_version;
1148 session->consumer->relay_minor_version =
1149 usess->consumer->relay_minor_version;
eacb7b6f
MD
1150 session->consumer->relay_allows_clear =
1151 usess->consumer->relay_allows_clear;
2f77fc4b
DG
1152 }
1153
1154 if (ksess && ksess->consumer && ksess->consumer->type == CONSUMER_DST_NET
1155 && ksess->consumer->enabled) {
1156 cds_lfht_for_each_entry(ksess->consumer->socks->ht, &iter.iter,
1157 socket, node.node) {
2f77fc4b 1158 pthread_mutex_lock(socket->lock);
6dc3064a 1159 ret = send_consumer_relayd_sockets(LTTNG_DOMAIN_KERNEL, session->id,
d3e2ba59
JD
1160 ksess->consumer, socket,
1161 session->name, session->hostname,
6fa5fe7c 1162 session->base_path,
1e791a74 1163 session->live_timer,
db1da059 1164 current_chunk_id.is_set ? &current_chunk_id.value : NULL,
46ef2188
MD
1165 session->creation_time,
1166 session->name_contains_creation_time);
2f77fc4b 1167 pthread_mutex_unlock(socket->lock);
f73fabfd 1168 if (ret != LTTNG_OK) {
2f77fc4b
DG
1169 goto error;
1170 }
6dc3064a
DG
1171 /* Session is now ready for network streaming. */
1172 session->net_handle = 1;
2f77fc4b 1173 }
b31610f2
JD
1174 session->consumer->relay_major_version =
1175 ksess->consumer->relay_major_version;
1176 session->consumer->relay_minor_version =
1177 ksess->consumer->relay_minor_version;
eacb7b6f
MD
1178 session->consumer->relay_allows_clear =
1179 ksess->consumer->relay_allows_clear;
2f77fc4b
DG
1180 }
1181
1182error:
e7fe706f 1183 rcu_read_unlock();
2f77fc4b
DG
1184 return ret;
1185}
1186
9b6c7ec5
DG
1187/*
1188 * Start a kernel session by opening all necessary streams.
1189 */
4dbe1875 1190int start_kernel_session(struct ltt_kernel_session *ksess)
9b6c7ec5
DG
1191{
1192 int ret;
1193 struct ltt_kernel_channel *kchan;
1194
1195 /* Open kernel metadata */
07b86b52 1196 if (ksess->metadata == NULL && ksess->output_traces) {
9b6c7ec5
DG
1197 ret = kernel_open_metadata(ksess);
1198 if (ret < 0) {
1199 ret = LTTNG_ERR_KERN_META_FAIL;
1200 goto error;
1201 }
1202 }
1203
1204 /* Open kernel metadata stream */
07b86b52 1205 if (ksess->metadata && ksess->metadata_stream_fd < 0) {
9b6c7ec5
DG
1206 ret = kernel_open_metadata_stream(ksess);
1207 if (ret < 0) {
1208 ERR("Kernel create metadata stream failed");
1209 ret = LTTNG_ERR_KERN_STREAM_FAIL;
1210 goto error;
1211 }
1212 }
1213
1214 /* For each channel */
1215 cds_list_for_each_entry(kchan, &ksess->channel_list.head, list) {
1216 if (kchan->stream_count == 0) {
1217 ret = kernel_open_channel_stream(kchan);
1218 if (ret < 0) {
1219 ret = LTTNG_ERR_KERN_STREAM_FAIL;
1220 goto error;
1221 }
1222 /* Update the stream global counter */
1223 ksess->stream_count_global += ret;
1224 }
1225 }
1226
1227 /* Setup kernel consumer socket and send fds to it */
1228 ret = init_kernel_tracing(ksess);
e43c41c5 1229 if (ret != 0) {
9b6c7ec5
DG
1230 ret = LTTNG_ERR_KERN_START_FAIL;
1231 goto error;
1232 }
1233
1234 /* This start the kernel tracing */
1235 ret = kernel_start_session(ksess);
1236 if (ret < 0) {
1237 ret = LTTNG_ERR_KERN_START_FAIL;
1238 goto error;
1239 }
1240
1241 /* Quiescent wait after starting trace */
7d268848 1242 kernel_wait_quiescent();
9b6c7ec5 1243
14fb1ebe 1244 ksess->active = 1;
9b6c7ec5
DG
1245
1246 ret = LTTNG_OK;
1247
1248error:
1249 return ret;
1250}
1251
4dbe1875
MD
1252int stop_kernel_session(struct ltt_kernel_session *ksess)
1253{
1254 struct ltt_kernel_channel *kchan;
1255 bool error_occurred = false;
1256 int ret;
1257
1258 if (!ksess || !ksess->active) {
1259 return LTTNG_OK;
1260 }
1261 DBG("Stopping kernel tracing");
1262
1263 ret = kernel_stop_session(ksess);
1264 if (ret < 0) {
1265 ret = LTTNG_ERR_KERN_STOP_FAIL;
1266 goto error;
1267 }
1268
1269 kernel_wait_quiescent();
1270
1271 /* Flush metadata after stopping (if exists) */
1272 if (ksess->metadata_stream_fd >= 0) {
1273 ret = kernel_metadata_flush_buffer(ksess->metadata_stream_fd);
1274 if (ret < 0) {
1275 ERR("Kernel metadata flush failed");
1276 error_occurred = true;
1277 }
1278 }
1279
1280 /* Flush all buffers after stopping */
1281 cds_list_for_each_entry(kchan, &ksess->channel_list.head, list) {
1282 ret = kernel_flush_buffer(kchan);
1283 if (ret < 0) {
1284 ERR("Kernel flush buffer error");
1285 error_occurred = true;
1286 }
1287 }
1288
1289 ksess->active = 0;
1290 if (error_occurred) {
1291 ret = LTTNG_ERR_UNK;
1292 } else {
1293 ret = LTTNG_OK;
1294 }
1295error:
1296 return ret;
1297}
1298
2f77fc4b
DG
1299/*
1300 * Command LTTNG_DISABLE_CHANNEL processed by the client thread.
1301 */
56a37563
JG
1302int cmd_disable_channel(struct ltt_session *session,
1303 enum lttng_domain_type domain, char *channel_name)
2f77fc4b
DG
1304{
1305 int ret;
1306 struct ltt_ust_session *usess;
1307
1308 usess = session->ust_session;
1309
2223c96f
DG
1310 rcu_read_lock();
1311
2f77fc4b
DG
1312 switch (domain) {
1313 case LTTNG_DOMAIN_KERNEL:
1314 {
1315 ret = channel_kernel_disable(session->kernel_session,
1316 channel_name);
f73fabfd 1317 if (ret != LTTNG_OK) {
2f77fc4b
DG
1318 goto error;
1319 }
1320
7d268848 1321 kernel_wait_quiescent();
2f77fc4b
DG
1322 break;
1323 }
1324 case LTTNG_DOMAIN_UST:
1325 {
1326 struct ltt_ust_channel *uchan;
1327 struct lttng_ht *chan_ht;
1328
1329 chan_ht = usess->domain_global.channels;
1330
1331 uchan = trace_ust_find_channel_by_name(chan_ht, channel_name);
1332 if (uchan == NULL) {
f73fabfd 1333 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
2f77fc4b
DG
1334 goto error;
1335 }
1336
7972aab2 1337 ret = channel_ust_disable(usess, uchan);
f73fabfd 1338 if (ret != LTTNG_OK) {
2f77fc4b
DG
1339 goto error;
1340 }
1341 break;
1342 }
2f77fc4b 1343 default:
f73fabfd 1344 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
2f77fc4b
DG
1345 goto error;
1346 }
1347
f73fabfd 1348 ret = LTTNG_OK;
2f77fc4b
DG
1349
1350error:
2223c96f 1351 rcu_read_unlock();
2f77fc4b
DG
1352 return ret;
1353}
1354
1355/*
1356 * Command LTTNG_ENABLE_CHANNEL processed by the client thread.
1357 *
1358 * The wpipe arguments is used as a notifier for the kernel thread.
1359 */
1360int cmd_enable_channel(struct ltt_session *session,
df4f5a87 1361 const struct lttng_domain *domain, const struct lttng_channel *_attr, int wpipe)
2f77fc4b
DG
1362{
1363 int ret;
1364 struct ltt_ust_session *usess = session->ust_session;
1365 struct lttng_ht *chan_ht;
1f345e94 1366 size_t len;
df4f5a87 1367 struct lttng_channel attr;
2f77fc4b
DG
1368
1369 assert(session);
df4f5a87 1370 assert(_attr);
7972aab2 1371 assert(domain);
2f77fc4b 1372
df4f5a87
JG
1373 attr = *_attr;
1374 len = lttng_strnlen(attr.name, sizeof(attr.name));
1f345e94
PP
1375
1376 /* Validate channel name */
df4f5a87
JG
1377 if (attr.name[0] == '.' ||
1378 memchr(attr.name, '/', len) != NULL) {
1f345e94
PP
1379 ret = LTTNG_ERR_INVALID_CHANNEL_NAME;
1380 goto end;
1381 }
1382
df4f5a87 1383 DBG("Enabling channel %s for session %s", attr.name, session->name);
2f77fc4b 1384
03b4fdcf
DG
1385 rcu_read_lock();
1386
ecc48a90
JD
1387 /*
1388 * Don't try to enable a channel if the session has been started at
1389 * some point in time before. The tracer does not allow it.
1390 */
8382cf6f 1391 if (session->has_been_started) {
ecc48a90
JD
1392 ret = LTTNG_ERR_TRACE_ALREADY_STARTED;
1393 goto error;
1394 }
1395
1396 /*
1397 * If the session is a live session, remove the switch timer, the
1398 * live timer does the same thing but sends also synchronisation
1399 * beacons for inactive streams.
1400 */
1401 if (session->live_timer > 0) {
df4f5a87
JG
1402 attr.attr.live_timer_interval = session->live_timer;
1403 attr.attr.switch_timer_interval = 0;
ecc48a90
JD
1404 }
1405
6e21424e
JR
1406 /* Check for feature support */
1407 switch (domain->type) {
1408 case LTTNG_DOMAIN_KERNEL:
1409 {
7d268848 1410 if (kernel_supports_ring_buffer_snapshot_sample_positions() != 1) {
6e21424e
JR
1411 /* Sampling position of buffer is not supported */
1412 WARN("Kernel tracer does not support buffer monitoring. "
1413 "Setting the monitor interval timer to 0 "
1414 "(disabled) for channel '%s' of session '%s'",
df4f5a87
JG
1415 attr.name, session->name);
1416 lttng_channel_set_monitor_timer_interval(&attr, 0);
6e21424e
JR
1417 }
1418 break;
1419 }
1420 case LTTNG_DOMAIN_UST:
f28f9e44 1421 break;
6e21424e
JR
1422 case LTTNG_DOMAIN_JUL:
1423 case LTTNG_DOMAIN_LOG4J:
1424 case LTTNG_DOMAIN_PYTHON:
f28f9e44
JG
1425 if (!agent_tracing_is_enabled()) {
1426 DBG("Attempted to enable a channel in an agent domain but the agent thread is not running");
1427 ret = LTTNG_ERR_AGENT_TRACING_DISABLED;
1428 goto error;
1429 }
6e21424e
JR
1430 break;
1431 default:
1432 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
1433 goto error;
1434 }
1435
7972aab2 1436 switch (domain->type) {
2f77fc4b
DG
1437 case LTTNG_DOMAIN_KERNEL:
1438 {
1439 struct ltt_kernel_channel *kchan;
1440
df4f5a87 1441 kchan = trace_kernel_get_channel_by_name(attr.name,
2f77fc4b
DG
1442 session->kernel_session);
1443 if (kchan == NULL) {
54213acc
JG
1444 if (session->snapshot.nb_output > 0 ||
1445 session->snapshot_mode) {
1446 /* Enforce mmap output for snapshot sessions. */
df4f5a87 1447 attr.attr.output = LTTNG_EVENT_MMAP;
54213acc 1448 }
df4f5a87
JG
1449 ret = channel_kernel_create(session->kernel_session, &attr, wpipe);
1450 if (attr.name[0] != '\0') {
85076754
MD
1451 session->kernel_session->has_non_default_channel = 1;
1452 }
2f77fc4b
DG
1453 } else {
1454 ret = channel_kernel_enable(session->kernel_session, kchan);
1455 }
1456
f73fabfd 1457 if (ret != LTTNG_OK) {
2f77fc4b
DG
1458 goto error;
1459 }
1460
7d268848 1461 kernel_wait_quiescent();
2f77fc4b
DG
1462 break;
1463 }
1464 case LTTNG_DOMAIN_UST:
9232818f
JG
1465 case LTTNG_DOMAIN_JUL:
1466 case LTTNG_DOMAIN_LOG4J:
1467 case LTTNG_DOMAIN_PYTHON:
2f77fc4b
DG
1468 {
1469 struct ltt_ust_channel *uchan;
1470
9232818f
JG
1471 /*
1472 * FIXME
1473 *
1474 * Current agent implementation limitations force us to allow
1475 * only one channel at once in "agent" subdomains. Each
1476 * subdomain has a default channel name which must be strictly
1477 * adhered to.
1478 */
1479 if (domain->type == LTTNG_DOMAIN_JUL) {
df4f5a87 1480 if (strncmp(attr.name, DEFAULT_JUL_CHANNEL_NAME,
9232818f
JG
1481 LTTNG_SYMBOL_NAME_LEN)) {
1482 ret = LTTNG_ERR_INVALID_CHANNEL_NAME;
1483 goto error;
1484 }
1485 } else if (domain->type == LTTNG_DOMAIN_LOG4J) {
df4f5a87 1486 if (strncmp(attr.name, DEFAULT_LOG4J_CHANNEL_NAME,
9232818f
JG
1487 LTTNG_SYMBOL_NAME_LEN)) {
1488 ret = LTTNG_ERR_INVALID_CHANNEL_NAME;
1489 goto error;
1490 }
1491 } else if (domain->type == LTTNG_DOMAIN_PYTHON) {
df4f5a87 1492 if (strncmp(attr.name, DEFAULT_PYTHON_CHANNEL_NAME,
9232818f
JG
1493 LTTNG_SYMBOL_NAME_LEN)) {
1494 ret = LTTNG_ERR_INVALID_CHANNEL_NAME;
1495 goto error;
1496 }
1497 }
1498
2f77fc4b
DG
1499 chan_ht = usess->domain_global.channels;
1500
df4f5a87 1501 uchan = trace_ust_find_channel_by_name(chan_ht, attr.name);
2f77fc4b 1502 if (uchan == NULL) {
df4f5a87
JG
1503 ret = channel_ust_create(usess, &attr, domain->buf_type);
1504 if (attr.name[0] != '\0') {
85076754
MD
1505 usess->has_non_default_channel = 1;
1506 }
2f77fc4b 1507 } else {
7972aab2 1508 ret = channel_ust_enable(usess, uchan);
2f77fc4b
DG
1509 }
1510 break;
1511 }
2f77fc4b 1512 default:
f73fabfd 1513 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
2f77fc4b
DG
1514 goto error;
1515 }
1516
df4f5a87 1517 if (ret == LTTNG_OK && attr.attr.output != LTTNG_EVENT_MMAP) {
54213acc
JG
1518 session->has_non_mmap_channel = true;
1519 }
2f77fc4b 1520error:
2223c96f 1521 rcu_read_unlock();
1f345e94 1522end:
2f77fc4b
DG
1523 return ret;
1524}
1525
159b042f
JG
1526enum lttng_error_code cmd_process_attr_tracker_get_tracking_policy(
1527 struct ltt_session *session,
1528 enum lttng_domain_type domain,
1529 enum lttng_process_attr process_attr,
1530 enum lttng_tracking_policy *policy)
1531{
1532 enum lttng_error_code ret_code = LTTNG_OK;
1533 const struct process_attr_tracker *tracker;
1534
1535 switch (domain) {
1536 case LTTNG_DOMAIN_KERNEL:
1537 if (!session->kernel_session) {
1538 ret_code = LTTNG_ERR_INVALID;
1539 goto end;
1540 }
1541 tracker = kernel_get_process_attr_tracker(
1542 session->kernel_session, process_attr);
1543 break;
1544 case LTTNG_DOMAIN_UST:
1545 if (!session->ust_session) {
1546 ret_code = LTTNG_ERR_INVALID;
1547 goto end;
1548 }
1549 tracker = trace_ust_get_process_attr_tracker(
1550 session->ust_session, process_attr);
1551 break;
1552 default:
1553 ret_code = LTTNG_ERR_UNSUPPORTED_DOMAIN;
1554 goto end;
1555 }
1556 if (tracker) {
1557 *policy = process_attr_tracker_get_tracking_policy(tracker);
1558 } else {
1559 ret_code = LTTNG_ERR_INVALID;
1560 }
1561end:
1562 return ret_code;
1563}
1564
1565enum lttng_error_code cmd_process_attr_tracker_set_tracking_policy(
1566 struct ltt_session *session,
1567 enum lttng_domain_type domain,
1568 enum lttng_process_attr process_attr,
1569 enum lttng_tracking_policy policy)
1570{
1571 enum lttng_error_code ret_code = LTTNG_OK;
1572
1573 switch (policy) {
1574 case LTTNG_TRACKING_POLICY_INCLUDE_SET:
1575 case LTTNG_TRACKING_POLICY_EXCLUDE_ALL:
1576 case LTTNG_TRACKING_POLICY_INCLUDE_ALL:
1577 break;
1578 default:
1579 ret_code = LTTNG_ERR_INVALID;
1580 goto end;
1581 }
1582
1583 switch (domain) {
1584 case LTTNG_DOMAIN_KERNEL:
1585 if (!session->kernel_session) {
1586 ret_code = LTTNG_ERR_INVALID;
1587 goto end;
1588 }
1589 ret_code = kernel_process_attr_tracker_set_tracking_policy(
1590 session->kernel_session, process_attr, policy);
1591 break;
1592 case LTTNG_DOMAIN_UST:
1593 if (!session->ust_session) {
1594 ret_code = LTTNG_ERR_INVALID;
1595 goto end;
1596 }
1597 ret_code = trace_ust_process_attr_tracker_set_tracking_policy(
1598 session->ust_session, process_attr, policy);
1599 break;
1600 default:
1601 ret_code = LTTNG_ERR_UNSUPPORTED_DOMAIN;
1602 break;
1603 }
1604end:
1605 return ret_code;
1606}
1607
1608enum lttng_error_code cmd_process_attr_tracker_inclusion_set_add_value(
1609 struct ltt_session *session,
1610 enum lttng_domain_type domain,
1611 enum lttng_process_attr process_attr,
1612 const struct process_attr_value *value)
1613{
1614 enum lttng_error_code ret_code = LTTNG_OK;
1615
1616 switch (domain) {
1617 case LTTNG_DOMAIN_KERNEL:
1618 if (!session->kernel_session) {
1619 ret_code = LTTNG_ERR_INVALID;
1620 goto end;
1621 }
1622 ret_code = kernel_process_attr_tracker_inclusion_set_add_value(
1623 session->kernel_session, process_attr, value);
1624 break;
1625 case LTTNG_DOMAIN_UST:
1626 if (!session->ust_session) {
1627 ret_code = LTTNG_ERR_INVALID;
1628 goto end;
1629 }
1630 ret_code = trace_ust_process_attr_tracker_inclusion_set_add_value(
1631 session->ust_session, process_attr, value);
1632 break;
1633 default:
1634 ret_code = LTTNG_ERR_UNSUPPORTED_DOMAIN;
1635 break;
1636 }
1637end:
1638 return ret_code;
1639}
1640
1641enum lttng_error_code cmd_process_attr_tracker_inclusion_set_remove_value(
1642 struct ltt_session *session,
1643 enum lttng_domain_type domain,
1644 enum lttng_process_attr process_attr,
1645 const struct process_attr_value *value)
1646{
1647 enum lttng_error_code ret_code = LTTNG_OK;
1648
1649 switch (domain) {
1650 case LTTNG_DOMAIN_KERNEL:
1651 if (!session->kernel_session) {
1652 ret_code = LTTNG_ERR_INVALID;
1653 goto end;
1654 }
1655 ret_code = kernel_process_attr_tracker_inclusion_set_remove_value(
1656 session->kernel_session, process_attr, value);
1657 break;
1658 case LTTNG_DOMAIN_UST:
1659 if (!session->ust_session) {
1660 ret_code = LTTNG_ERR_INVALID;
1661 goto end;
1662 }
1663 ret_code = trace_ust_process_attr_tracker_inclusion_set_remove_value(
1664 session->ust_session, process_attr, value);
1665 break;
1666 default:
1667 ret_code = LTTNG_ERR_UNSUPPORTED_DOMAIN;
1668 break;
1669 }
1670end:
1671 return ret_code;
1672}
1673
1674enum lttng_error_code cmd_process_attr_tracker_get_inclusion_set(
1675 struct ltt_session *session,
1676 enum lttng_domain_type domain,
1677 enum lttng_process_attr process_attr,
1678 struct lttng_process_attr_values **values)
1679{
1680 enum lttng_error_code ret_code = LTTNG_OK;
1681 const struct process_attr_tracker *tracker;
1682 enum process_attr_tracker_status status;
1683
1684 switch (domain) {
1685 case LTTNG_DOMAIN_KERNEL:
1686 if (!session->kernel_session) {
1687 ret_code = LTTNG_ERR_INVALID;
1688 goto end;
1689 }
1690 tracker = kernel_get_process_attr_tracker(
1691 session->kernel_session, process_attr);
1692 break;
1693 case LTTNG_DOMAIN_UST:
1694 if (!session->ust_session) {
1695 ret_code = LTTNG_ERR_INVALID;
1696 goto end;
1697 }
1698 tracker = trace_ust_get_process_attr_tracker(
1699 session->ust_session, process_attr);
1700 break;
1701 default:
1702 ret_code = LTTNG_ERR_UNSUPPORTED_DOMAIN;
1703 goto end;
1704 }
1705
1706 if (!tracker) {
1707 ret_code = LTTNG_ERR_INVALID;
1708 goto end;
1709 }
1710
1711 status = process_attr_tracker_get_inclusion_set(tracker, values);
1712 switch (status) {
1713 case PROCESS_ATTR_TRACKER_STATUS_OK:
1714 ret_code = LTTNG_OK;
1715 break;
1716 case PROCESS_ATTR_TRACKER_STATUS_INVALID_TRACKING_POLICY:
1717 ret_code = LTTNG_ERR_PROCESS_ATTR_TRACKER_INVALID_TRACKING_POLICY;
1718 break;
1719 case PROCESS_ATTR_TRACKER_STATUS_ERROR:
1720 ret_code = LTTNG_ERR_NOMEM;
1721 break;
1722 default:
1723 ret_code = LTTNG_ERR_UNK;
1724 break;
1725 }
1726
1727end:
1728 return ret_code;
1729}
1730
2f77fc4b
DG
1731/*
1732 * Command LTTNG_DISABLE_EVENT processed by the client thread.
1733 */
56a37563 1734int cmd_disable_event(struct ltt_session *session,
df4f5a87
JG
1735 enum lttng_domain_type domain, const char *channel_name,
1736 const struct lttng_event *event)
2f77fc4b
DG
1737{
1738 int ret;
df4f5a87 1739 const char *event_name;
6e911cad 1740
18a720cd
MD
1741 DBG("Disable event command for event \'%s\'", event->name);
1742
6e911cad
MD
1743 event_name = event->name;
1744
9b7431cf
JG
1745 /* Error out on unhandled search criteria */
1746 if (event->loglevel_type || event->loglevel != -1 || event->enabled
6e911cad 1747 || event->pid || event->filter || event->exclusion) {
7076b56e
JG
1748 ret = LTTNG_ERR_UNK;
1749 goto error;
6e911cad 1750 }
2f77fc4b 1751
2223c96f
DG
1752 rcu_read_lock();
1753
2f77fc4b
DG
1754 switch (domain) {
1755 case LTTNG_DOMAIN_KERNEL:
1756 {
1757 struct ltt_kernel_channel *kchan;
1758 struct ltt_kernel_session *ksess;
1759
1760 ksess = session->kernel_session;
1761
85076754
MD
1762 /*
1763 * If a non-default channel has been created in the
1764 * session, explicitely require that -c chan_name needs
1765 * to be provided.
1766 */
1767 if (ksess->has_non_default_channel && channel_name[0] == '\0') {
1768 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
7076b56e 1769 goto error_unlock;
85076754
MD
1770 }
1771
2f77fc4b
DG
1772 kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
1773 if (kchan == NULL) {
f73fabfd 1774 ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND;
7076b56e 1775 goto error_unlock;
2f77fc4b
DG
1776 }
1777
6e911cad
MD
1778 switch (event->type) {
1779 case LTTNG_EVENT_ALL:
9550ee81 1780 case LTTNG_EVENT_TRACEPOINT:
d0ae4ea8 1781 case LTTNG_EVENT_SYSCALL:
9550ee81
JR
1782 case LTTNG_EVENT_PROBE:
1783 case LTTNG_EVENT_FUNCTION:
1784 case LTTNG_EVENT_FUNCTION_ENTRY:/* fall-through */
1785 if (event_name[0] == '\0') {
1786 ret = event_kernel_disable_event(kchan,
1787 NULL, event->type);
29c62722 1788 } else {
d0ae4ea8 1789 ret = event_kernel_disable_event(kchan,
9550ee81 1790 event_name, event->type);
29c62722 1791 }
6e911cad 1792 if (ret != LTTNG_OK) {
7076b56e 1793 goto error_unlock;
6e911cad
MD
1794 }
1795 break;
6e911cad
MD
1796 default:
1797 ret = LTTNG_ERR_UNK;
7076b56e 1798 goto error_unlock;
2f77fc4b
DG
1799 }
1800
7d268848 1801 kernel_wait_quiescent();
2f77fc4b
DG
1802 break;
1803 }
1804 case LTTNG_DOMAIN_UST:
1805 {
1806 struct ltt_ust_channel *uchan;
1807 struct ltt_ust_session *usess;
1808
1809 usess = session->ust_session;
1810
7076b56e
JG
1811 if (validate_ust_event_name(event_name)) {
1812 ret = LTTNG_ERR_INVALID_EVENT_NAME;
1813 goto error_unlock;
1814 }
1815
85076754
MD
1816 /*
1817 * If a non-default channel has been created in the
9550ee81 1818 * session, explicitly require that -c chan_name needs
85076754
MD
1819 * to be provided.
1820 */
1821 if (usess->has_non_default_channel && channel_name[0] == '\0') {
1822 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
7076b56e 1823 goto error_unlock;
85076754
MD
1824 }
1825
2f77fc4b
DG
1826 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
1827 channel_name);
1828 if (uchan == NULL) {
f73fabfd 1829 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
7076b56e 1830 goto error_unlock;
2f77fc4b
DG
1831 }
1832
6e911cad
MD
1833 switch (event->type) {
1834 case LTTNG_EVENT_ALL:
b3639870
JR
1835 /*
1836 * An empty event name means that everything
1837 * should be disabled.
1838 */
1839 if (event->name[0] == '\0') {
1840 ret = event_ust_disable_all_tracepoints(usess, uchan);
77d536b2
JR
1841 } else {
1842 ret = event_ust_disable_tracepoint(usess, uchan,
1843 event_name);
1844 }
6e911cad 1845 if (ret != LTTNG_OK) {
7076b56e 1846 goto error_unlock;
6e911cad
MD
1847 }
1848 break;
1849 default:
1850 ret = LTTNG_ERR_UNK;
7076b56e 1851 goto error_unlock;
2f77fc4b
DG
1852 }
1853
1854 DBG3("Disable UST event %s in channel %s completed", event_name,
1855 channel_name);
1856 break;
1857 }
5cdb6027 1858 case LTTNG_DOMAIN_LOG4J:
f20baf8e 1859 case LTTNG_DOMAIN_JUL:
0e115563 1860 case LTTNG_DOMAIN_PYTHON:
f20baf8e 1861 {
fefd409b 1862 struct agent *agt;
f20baf8e
DG
1863 struct ltt_ust_session *usess = session->ust_session;
1864
1865 assert(usess);
1866
6e911cad
MD
1867 switch (event->type) {
1868 case LTTNG_EVENT_ALL:
1869 break;
1870 default:
1871 ret = LTTNG_ERR_UNK;
7076b56e 1872 goto error_unlock;
6e911cad
MD
1873 }
1874
5cdb6027 1875 agt = trace_ust_find_agent(usess, domain);
fefd409b
DG
1876 if (!agt) {
1877 ret = -LTTNG_ERR_UST_EVENT_NOT_FOUND;
7076b56e 1878 goto error_unlock;
fefd409b 1879 }
b3639870
JR
1880 /*
1881 * An empty event name means that everything
1882 * should be disabled.
1883 */
1884 if (event->name[0] == '\0') {
18a720cd
MD
1885 ret = event_agent_disable_all(usess, agt);
1886 } else {
1887 ret = event_agent_disable(usess, agt, event_name);
1888 }
f20baf8e 1889 if (ret != LTTNG_OK) {
7076b56e 1890 goto error_unlock;
f20baf8e
DG
1891 }
1892
1893 break;
1894 }
2f77fc4b 1895 default:
f73fabfd 1896 ret = LTTNG_ERR_UND;
7076b56e 1897 goto error_unlock;
2f77fc4b
DG
1898 }
1899
f73fabfd 1900 ret = LTTNG_OK;
2f77fc4b 1901
7076b56e 1902error_unlock:
2223c96f 1903 rcu_read_unlock();
7076b56e 1904error:
2f77fc4b
DG
1905 return ret;
1906}
1907
2f77fc4b
DG
1908/*
1909 * Command LTTNG_ADD_CONTEXT processed by the client thread.
1910 */
56a37563 1911int cmd_add_context(struct ltt_session *session, enum lttng_domain_type domain,
df4f5a87 1912 char *channel_name, const struct lttng_event_context *ctx, int kwpipe)
2f77fc4b 1913{
d5979e4a 1914 int ret, chan_kern_created = 0, chan_ust_created = 0;
bdf64013
JG
1915 char *app_ctx_provider_name = NULL, *app_ctx_name = NULL;
1916
9a699f7b
JR
1917 /*
1918 * Don't try to add a context if the session has been started at
1919 * some point in time before. The tracer does not allow it and would
1920 * result in a corrupted trace.
1921 */
1922 if (session->has_been_started) {
1923 ret = LTTNG_ERR_TRACE_ALREADY_STARTED;
1924 goto end;
1925 }
1926
bdf64013
JG
1927 if (ctx->ctx == LTTNG_EVENT_CONTEXT_APP_CONTEXT) {
1928 app_ctx_provider_name = ctx->u.app_ctx.provider_name;
1929 app_ctx_name = ctx->u.app_ctx.ctx_name;
1930 }
2f77fc4b
DG
1931
1932 switch (domain) {
1933 case LTTNG_DOMAIN_KERNEL:
979e618e
DG
1934 assert(session->kernel_session);
1935
1936 if (session->kernel_session->channel_count == 0) {
1937 /* Create default channel */
1938 ret = channel_kernel_create(session->kernel_session, NULL, kwpipe);
1939 if (ret != LTTNG_OK) {
1940 goto error;
1941 }
d5979e4a 1942 chan_kern_created = 1;
979e618e 1943 }
2f77fc4b 1944 /* Add kernel context to kernel tracer */
601d5acf 1945 ret = context_kernel_add(session->kernel_session, ctx, channel_name);
f73fabfd 1946 if (ret != LTTNG_OK) {
2f77fc4b
DG
1947 goto error;
1948 }
1949 break;
bdf64013
JG
1950 case LTTNG_DOMAIN_JUL:
1951 case LTTNG_DOMAIN_LOG4J:
1952 {
1953 /*
1954 * Validate channel name.
1955 * If no channel name is given and the domain is JUL or LOG4J,
1956 * set it to the appropriate domain-specific channel name. If
1957 * a name is provided but does not match the expexted channel
1958 * name, return an error.
1959 */
1960 if (domain == LTTNG_DOMAIN_JUL && *channel_name &&
1961 strcmp(channel_name,
1962 DEFAULT_JUL_CHANNEL_NAME)) {
1963 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
1964 goto error;
1965 } else if (domain == LTTNG_DOMAIN_LOG4J && *channel_name &&
1966 strcmp(channel_name,
1967 DEFAULT_LOG4J_CHANNEL_NAME)) {
1968 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
1969 goto error;
1970 }
a93b3916 1971 /* break is _not_ missing here. */
bdf64013 1972 }
2f77fc4b
DG
1973 case LTTNG_DOMAIN_UST:
1974 {
1975 struct ltt_ust_session *usess = session->ust_session;
85076754
MD
1976 unsigned int chan_count;
1977
2f77fc4b
DG
1978 assert(usess);
1979
85076754 1980 chan_count = lttng_ht_get_count(usess->domain_global.channels);
979e618e
DG
1981 if (chan_count == 0) {
1982 struct lttng_channel *attr;
1983 /* Create default channel */
0a9c6494 1984 attr = channel_new_default_attr(domain, usess->buffer_type);
979e618e
DG
1985 if (attr == NULL) {
1986 ret = LTTNG_ERR_FATAL;
1987 goto error;
1988 }
1989
7972aab2 1990 ret = channel_ust_create(usess, attr, usess->buffer_type);
979e618e
DG
1991 if (ret != LTTNG_OK) {
1992 free(attr);
1993 goto error;
1994 }
cf0bcb51 1995 channel_attr_destroy(attr);
d5979e4a 1996 chan_ust_created = 1;
979e618e
DG
1997 }
1998
601d5acf 1999 ret = context_ust_add(usess, domain, ctx, channel_name);
bdf64013
JG
2000 free(app_ctx_provider_name);
2001 free(app_ctx_name);
2002 app_ctx_name = NULL;
2003 app_ctx_provider_name = NULL;
f73fabfd 2004 if (ret != LTTNG_OK) {
2f77fc4b
DG
2005 goto error;
2006 }
2007 break;
2008 }
2f77fc4b 2009 default:
f73fabfd 2010 ret = LTTNG_ERR_UND;
2f77fc4b
DG
2011 goto error;
2012 }
2013
bdf64013
JG
2014 ret = LTTNG_OK;
2015 goto end;
2f77fc4b
DG
2016
2017error:
d5979e4a
DG
2018 if (chan_kern_created) {
2019 struct ltt_kernel_channel *kchan =
2020 trace_kernel_get_channel_by_name(DEFAULT_CHANNEL_NAME,
2021 session->kernel_session);
2022 /* Created previously, this should NOT fail. */
2023 assert(kchan);
2024 kernel_destroy_channel(kchan);
2025 }
2026
2027 if (chan_ust_created) {
2028 struct ltt_ust_channel *uchan =
2029 trace_ust_find_channel_by_name(
2030 session->ust_session->domain_global.channels,
2031 DEFAULT_CHANNEL_NAME);
2032 /* Created previously, this should NOT fail. */
2033 assert(uchan);
2034 /* Remove from the channel list of the session. */
2035 trace_ust_delete_channel(session->ust_session->domain_global.channels,
2036 uchan);
2037 trace_ust_destroy_channel(uchan);
2038 }
bdf64013
JG
2039end:
2040 free(app_ctx_provider_name);
2041 free(app_ctx_name);
2f77fc4b
DG
2042 return ret;
2043}
2044
dac8e046
JG
2045static inline bool name_starts_with(const char *name, const char *prefix)
2046{
2047 const size_t max_cmp_len = min(strlen(prefix), LTTNG_SYMBOL_NAME_LEN);
2048
2049 return !strncmp(name, prefix, max_cmp_len);
2050}
2051
2052/* Perform userspace-specific event name validation */
2053static int validate_ust_event_name(const char *name)
2054{
2055 int ret = 0;
2056
2057 if (!name) {
2058 ret = -1;
2059 goto end;
2060 }
2061
2062 /*
2063 * Check name against all internal UST event component namespaces used
2064 * by the agents.
2065 */
2066 if (name_starts_with(name, DEFAULT_JUL_EVENT_COMPONENT) ||
2067 name_starts_with(name, DEFAULT_LOG4J_EVENT_COMPONENT) ||
2068 name_starts_with(name, DEFAULT_PYTHON_EVENT_COMPONENT)) {
2069 ret = -1;
2070 }
2071
2072end:
2073 return ret;
2074}
88f06f15 2075
2f77fc4b 2076/*
88f06f15
JG
2077 * Internal version of cmd_enable_event() with a supplemental
2078 * "internal_event" flag which is used to enable internal events which should
2079 * be hidden from clients. Such events are used in the agent implementation to
2080 * enable the events through which all "agent" events are funeled.
2f77fc4b 2081 */
88f06f15 2082static int _cmd_enable_event(struct ltt_session *session,
df4f5a87 2083 const struct lttng_domain *domain,
025faf73 2084 char *channel_name, struct lttng_event *event,
6b453b5e 2085 char *filter_expression,
db8f1377
JI
2086 struct lttng_filter_bytecode *filter,
2087 struct lttng_event_exclusion *exclusion,
88f06f15 2088 int wpipe, bool internal_event)
2f77fc4b 2089{
9f449915 2090 int ret = 0, channel_created = 0;
cfedea03 2091 struct lttng_channel *attr = NULL;
2f77fc4b
DG
2092
2093 assert(session);
2094 assert(event);
2095 assert(channel_name);
2096
2a385866
JG
2097 /* If we have a filter, we must have its filter expression */
2098 assert(!(!!filter_expression ^ !!filter));
2099
9f449915
PP
2100 /* Normalize event name as a globbing pattern */
2101 strutils_normalize_star_glob_pattern(event->name);
18a720cd 2102
9f449915
PP
2103 /* Normalize exclusion names as globbing patterns */
2104 if (exclusion) {
2105 size_t i;
f5ac4bd7 2106
9f449915
PP
2107 for (i = 0; i < exclusion->count; i++) {
2108 char *name = LTTNG_EVENT_EXCLUSION_NAME_AT(exclusion, i);
2109
2110 strutils_normalize_star_glob_pattern(name);
2111 }
930a2e99
JG
2112 }
2113
9f449915
PP
2114 DBG("Enable event command for event \'%s\'", event->name);
2115
2116 rcu_read_lock();
2117
7972aab2 2118 switch (domain->type) {
2f77fc4b
DG
2119 case LTTNG_DOMAIN_KERNEL:
2120 {
2121 struct ltt_kernel_channel *kchan;
2122
85076754
MD
2123 /*
2124 * If a non-default channel has been created in the
2125 * session, explicitely require that -c chan_name needs
2126 * to be provided.
2127 */
2128 if (session->kernel_session->has_non_default_channel
2129 && channel_name[0] == '\0') {
2130 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
2131 goto error;
2132 }
2133
2f77fc4b
DG
2134 kchan = trace_kernel_get_channel_by_name(channel_name,
2135 session->kernel_session);
2136 if (kchan == NULL) {
0a9c6494
DG
2137 attr = channel_new_default_attr(LTTNG_DOMAIN_KERNEL,
2138 LTTNG_BUFFER_GLOBAL);
2f77fc4b 2139 if (attr == NULL) {
f73fabfd 2140 ret = LTTNG_ERR_FATAL;
2f77fc4b
DG
2141 goto error;
2142 }
04c17253
MD
2143 if (lttng_strncpy(attr->name, channel_name,
2144 sizeof(attr->name))) {
2145 ret = LTTNG_ERR_INVALID;
04c17253
MD
2146 goto error;
2147 }
2f77fc4b
DG
2148
2149 ret = cmd_enable_channel(session, domain, attr, wpipe);
f73fabfd 2150 if (ret != LTTNG_OK) {
2f77fc4b
DG
2151 goto error;
2152 }
e5f5db7f 2153 channel_created = 1;
2f77fc4b
DG
2154 }
2155
2156 /* Get the newly created kernel channel pointer */
2157 kchan = trace_kernel_get_channel_by_name(channel_name,
2158 session->kernel_session);
2159 if (kchan == NULL) {
2160 /* This sould not happen... */
f73fabfd 2161 ret = LTTNG_ERR_FATAL;
2f77fc4b
DG
2162 goto error;
2163 }
2164
6e911cad
MD
2165 switch (event->type) {
2166 case LTTNG_EVENT_ALL:
29c62722 2167 {
00a62084
MD
2168 char *filter_expression_a = NULL;
2169 struct lttng_filter_bytecode *filter_a = NULL;
2170
2171 /*
2172 * We need to duplicate filter_expression and filter,
2173 * because ownership is passed to first enable
2174 * event.
2175 */
2176 if (filter_expression) {
2177 filter_expression_a = strdup(filter_expression);
2178 if (!filter_expression_a) {
2179 ret = LTTNG_ERR_FATAL;
2180 goto error;
2181 }
2182 }
2183 if (filter) {
2184 filter_a = zmalloc(sizeof(*filter_a) + filter->len);
2185 if (!filter_a) {
2186 free(filter_expression_a);
2187 ret = LTTNG_ERR_FATAL;
2188 goto error;
2189 }
2190 memcpy(filter_a, filter, sizeof(*filter_a) + filter->len);
2191 }
29c62722 2192 event->type = LTTNG_EVENT_TRACEPOINT; /* Hack */
00a62084
MD
2193 ret = event_kernel_enable_event(kchan, event,
2194 filter_expression, filter);
a969e101
MD
2195 /* We have passed ownership */
2196 filter_expression = NULL;
2197 filter = NULL;
29c62722
MD
2198 if (ret != LTTNG_OK) {
2199 if (channel_created) {
2200 /* Let's not leak a useless channel. */
2201 kernel_destroy_channel(kchan);
2202 }
00a62084
MD
2203 free(filter_expression_a);
2204 free(filter_a);
29c62722
MD
2205 goto error;
2206 }
2207 event->type = LTTNG_EVENT_SYSCALL; /* Hack */
00a62084
MD
2208 ret = event_kernel_enable_event(kchan, event,
2209 filter_expression_a, filter_a);
60d21fa2
AB
2210 /* We have passed ownership */
2211 filter_expression_a = NULL;
2212 filter_a = NULL;
29c62722
MD
2213 if (ret != LTTNG_OK) {
2214 goto error;
2215 }
2216 break;
2217 }
6e6ef3d7 2218 case LTTNG_EVENT_PROBE:
dcabc190 2219 case LTTNG_EVENT_USERSPACE_PROBE:
6e6ef3d7
DG
2220 case LTTNG_EVENT_FUNCTION:
2221 case LTTNG_EVENT_FUNCTION_ENTRY:
6e911cad 2222 case LTTNG_EVENT_TRACEPOINT:
00a62084
MD
2223 ret = event_kernel_enable_event(kchan, event,
2224 filter_expression, filter);
a969e101
MD
2225 /* We have passed ownership */
2226 filter_expression = NULL;
2227 filter = NULL;
6e911cad
MD
2228 if (ret != LTTNG_OK) {
2229 if (channel_created) {
2230 /* Let's not leak a useless channel. */
2231 kernel_destroy_channel(kchan);
2232 }
2233 goto error;
e5f5db7f 2234 }
6e911cad
MD
2235 break;
2236 case LTTNG_EVENT_SYSCALL:
00a62084
MD
2237 ret = event_kernel_enable_event(kchan, event,
2238 filter_expression, filter);
a969e101
MD
2239 /* We have passed ownership */
2240 filter_expression = NULL;
2241 filter = NULL;
e2b957af
MD
2242 if (ret != LTTNG_OK) {
2243 goto error;
2244 }
6e911cad
MD
2245 break;
2246 default:
2247 ret = LTTNG_ERR_UNK;
2f77fc4b
DG
2248 goto error;
2249 }
2250
7d268848 2251 kernel_wait_quiescent();
2f77fc4b
DG
2252 break;
2253 }
2254 case LTTNG_DOMAIN_UST:
2255 {
2256 struct ltt_ust_channel *uchan;
2257 struct ltt_ust_session *usess = session->ust_session;
2258
2259 assert(usess);
2260
85076754
MD
2261 /*
2262 * If a non-default channel has been created in the
2263 * session, explicitely require that -c chan_name needs
2264 * to be provided.
2265 */
2266 if (usess->has_non_default_channel && channel_name[0] == '\0') {
2267 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
2268 goto error;
2269 }
2270
2f77fc4b
DG
2271 /* Get channel from global UST domain */
2272 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2273 channel_name);
2274 if (uchan == NULL) {
2275 /* Create default channel */
0a9c6494
DG
2276 attr = channel_new_default_attr(LTTNG_DOMAIN_UST,
2277 usess->buffer_type);
2f77fc4b 2278 if (attr == NULL) {
f73fabfd 2279 ret = LTTNG_ERR_FATAL;
2f77fc4b
DG
2280 goto error;
2281 }
04c17253
MD
2282 if (lttng_strncpy(attr->name, channel_name,
2283 sizeof(attr->name))) {
2284 ret = LTTNG_ERR_INVALID;
04c17253
MD
2285 goto error;
2286 }
2f77fc4b
DG
2287
2288 ret = cmd_enable_channel(session, domain, attr, wpipe);
f73fabfd 2289 if (ret != LTTNG_OK) {
2f77fc4b
DG
2290 goto error;
2291 }
2f77fc4b
DG
2292
2293 /* Get the newly created channel reference back */
2294 uchan = trace_ust_find_channel_by_name(
2295 usess->domain_global.channels, channel_name);
2296 assert(uchan);
2297 }
2298
141feb8c
JG
2299 if (uchan->domain != LTTNG_DOMAIN_UST && !internal_event) {
2300 /*
2301 * Don't allow users to add UST events to channels which
2302 * are assigned to a userspace subdomain (JUL, Log4J,
2303 * Python, etc.).
2304 */
2305 ret = LTTNG_ERR_INVALID_CHANNEL_DOMAIN;
2306 goto error;
2307 }
2308
dac8e046
JG
2309 if (!internal_event) {
2310 /*
2311 * Ensure the event name is not reserved for internal
2312 * use.
2313 */
2314 ret = validate_ust_event_name(event->name);
2315 if (ret) {
0e270a1e 2316 WARN("Userspace event name %s failed validation.",
bbcab087 2317 event->name);
dac8e046
JG
2318 ret = LTTNG_ERR_INVALID_EVENT_NAME;
2319 goto error;
2320 }
2321 }
2322
2f77fc4b 2323 /* At this point, the session and channel exist on the tracer */
6b453b5e 2324 ret = event_ust_enable_tracepoint(usess, uchan, event,
88f06f15
JG
2325 filter_expression, filter, exclusion,
2326 internal_event);
49d21f93
MD
2327 /* We have passed ownership */
2328 filter_expression = NULL;
2329 filter = NULL;
2330 exclusion = NULL;
94382e15
JG
2331 if (ret == LTTNG_ERR_UST_EVENT_ENABLED) {
2332 goto already_enabled;
2333 } else if (ret != LTTNG_OK) {
2f77fc4b
DG
2334 goto error;
2335 }
2336 break;
2337 }
5cdb6027 2338 case LTTNG_DOMAIN_LOG4J:
f20baf8e 2339 case LTTNG_DOMAIN_JUL:
0e115563 2340 case LTTNG_DOMAIN_PYTHON:
f20baf8e 2341 {
da6c3a50 2342 const char *default_event_name, *default_chan_name;
fefd409b 2343 struct agent *agt;
f20baf8e
DG
2344 struct lttng_event uevent;
2345 struct lttng_domain tmp_dom;
2346 struct ltt_ust_session *usess = session->ust_session;
2347
2348 assert(usess);
2349
f28f9e44
JG
2350 if (!agent_tracing_is_enabled()) {
2351 DBG("Attempted to enable an event in an agent domain but the agent thread is not running");
2352 ret = LTTNG_ERR_AGENT_TRACING_DISABLED;
2353 goto error;
2354 }
2355
5cdb6027 2356 agt = trace_ust_find_agent(usess, domain->type);
fefd409b 2357 if (!agt) {
5cdb6027 2358 agt = agent_create(domain->type);
fefd409b 2359 if (!agt) {
e5b3c48c 2360 ret = LTTNG_ERR_NOMEM;
fefd409b
DG
2361 goto error;
2362 }
2363 agent_add(agt, usess->agents);
2364 }
2365
022d91ba 2366 /* Create the default tracepoint. */
996de3c7 2367 memset(&uevent, 0, sizeof(uevent));
f20baf8e
DG
2368 uevent.type = LTTNG_EVENT_TRACEPOINT;
2369 uevent.loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL;
51755dc8
JG
2370 default_event_name = event_get_default_agent_ust_name(
2371 domain->type);
da6c3a50 2372 if (!default_event_name) {
e5b3c48c 2373 ret = LTTNG_ERR_FATAL;
da6c3a50 2374 goto error;
f43f95a9 2375 }
da6c3a50 2376 strncpy(uevent.name, default_event_name, sizeof(uevent.name));
f20baf8e
DG
2377 uevent.name[sizeof(uevent.name) - 1] = '\0';
2378
2379 /*
2380 * The domain type is changed because we are about to enable the
2381 * default channel and event for the JUL domain that are hardcoded.
2382 * This happens in the UST domain.
2383 */
2384 memcpy(&tmp_dom, domain, sizeof(tmp_dom));
2385 tmp_dom.type = LTTNG_DOMAIN_UST;
2386
0e115563
DG
2387 switch (domain->type) {
2388 case LTTNG_DOMAIN_LOG4J:
da6c3a50 2389 default_chan_name = DEFAULT_LOG4J_CHANNEL_NAME;
0e115563
DG
2390 break;
2391 case LTTNG_DOMAIN_JUL:
da6c3a50 2392 default_chan_name = DEFAULT_JUL_CHANNEL_NAME;
0e115563
DG
2393 break;
2394 case LTTNG_DOMAIN_PYTHON:
2395 default_chan_name = DEFAULT_PYTHON_CHANNEL_NAME;
2396 break;
2397 default:
e98a44b0 2398 /* The switch/case we are in makes this impossible */
0e115563 2399 assert(0);
da6c3a50
DG
2400 }
2401
971da06a 2402 {
8404118c 2403 char *filter_expression_copy = NULL;
51755dc8 2404 struct lttng_filter_bytecode *filter_copy = NULL;
971da06a
JG
2405
2406 if (filter) {
51755dc8
JG
2407 const size_t filter_size = sizeof(
2408 struct lttng_filter_bytecode)
2409 + filter->len;
2410
2411 filter_copy = zmalloc(filter_size);
971da06a 2412 if (!filter_copy) {
018096a4 2413 ret = LTTNG_ERR_NOMEM;
b742e3e2 2414 goto error;
971da06a 2415 }
51755dc8 2416 memcpy(filter_copy, filter, filter_size);
971da06a 2417
8404118c
JG
2418 filter_expression_copy =
2419 strdup(filter_expression);
2420 if (!filter_expression) {
2421 ret = LTTNG_ERR_NOMEM;
51755dc8
JG
2422 }
2423
2424 if (!filter_expression_copy || !filter_copy) {
2425 free(filter_expression_copy);
2426 free(filter_copy);
2427 goto error;
8404118c 2428 }
971da06a
JG
2429 }
2430
88f06f15 2431 ret = cmd_enable_event_internal(session, &tmp_dom,
971da06a 2432 (char *) default_chan_name,
8404118c
JG
2433 &uevent, filter_expression_copy,
2434 filter_copy, NULL, wpipe);
971da06a
JG
2435 }
2436
94382e15
JG
2437 if (ret == LTTNG_ERR_UST_EVENT_ENABLED) {
2438 goto already_enabled;
2439 } else if (ret != LTTNG_OK) {
f20baf8e
DG
2440 goto error;
2441 }
2442
2443 /* The wild card * means that everything should be enabled. */
2444 if (strncmp(event->name, "*", 1) == 0 && strlen(event->name) == 1) {
8404118c
JG
2445 ret = event_agent_enable_all(usess, agt, event, filter,
2446 filter_expression);
f20baf8e 2447 } else {
8404118c
JG
2448 ret = event_agent_enable(usess, agt, event, filter,
2449 filter_expression);
f20baf8e 2450 }
51755dc8
JG
2451 filter = NULL;
2452 filter_expression = NULL;
f20baf8e
DG
2453 if (ret != LTTNG_OK) {
2454 goto error;
2455 }
2456
2457 break;
2458 }
2f77fc4b 2459 default:
f73fabfd 2460 ret = LTTNG_ERR_UND;
2f77fc4b
DG
2461 goto error;
2462 }
2463
f73fabfd 2464 ret = LTTNG_OK;
2f77fc4b 2465
94382e15 2466already_enabled:
2f77fc4b 2467error:
49d21f93
MD
2468 free(filter_expression);
2469 free(filter);
2470 free(exclusion);
cf0bcb51 2471 channel_attr_destroy(attr);
2223c96f 2472 rcu_read_unlock();
2f77fc4b
DG
2473 return ret;
2474}
2475
88f06f15
JG
2476/*
2477 * Command LTTNG_ENABLE_EVENT processed by the client thread.
2478 * We own filter, exclusion, and filter_expression.
2479 */
df4f5a87
JG
2480int cmd_enable_event(struct ltt_session *session,
2481 const struct lttng_domain *domain,
88f06f15
JG
2482 char *channel_name, struct lttng_event *event,
2483 char *filter_expression,
2484 struct lttng_filter_bytecode *filter,
2485 struct lttng_event_exclusion *exclusion,
2486 int wpipe)
2487{
2488 return _cmd_enable_event(session, domain, channel_name, event,
2489 filter_expression, filter, exclusion, wpipe, false);
2490}
2491
2492/*
2493 * Enable an event which is internal to LTTng. An internal should
2494 * never be made visible to clients and are immune to checks such as
2495 * reserved names.
2496 */
2497static int cmd_enable_event_internal(struct ltt_session *session,
df4f5a87 2498 const struct lttng_domain *domain,
88f06f15
JG
2499 char *channel_name, struct lttng_event *event,
2500 char *filter_expression,
2501 struct lttng_filter_bytecode *filter,
2502 struct lttng_event_exclusion *exclusion,
2503 int wpipe)
2504{
2505 return _cmd_enable_event(session, domain, channel_name, event,
2506 filter_expression, filter, exclusion, wpipe, true);
2507}
2508
2f77fc4b
DG
2509/*
2510 * Command LTTNG_LIST_TRACEPOINTS processed by the client thread.
2511 */
56a37563
JG
2512ssize_t cmd_list_tracepoints(enum lttng_domain_type domain,
2513 struct lttng_event **events)
2f77fc4b
DG
2514{
2515 int ret;
2516 ssize_t nb_events = 0;
2517
2518 switch (domain) {
2519 case LTTNG_DOMAIN_KERNEL:
7d268848 2520 nb_events = kernel_list_events(events);
2f77fc4b 2521 if (nb_events < 0) {
f73fabfd 2522 ret = LTTNG_ERR_KERN_LIST_FAIL;
2f77fc4b
DG
2523 goto error;
2524 }
2525 break;
2526 case LTTNG_DOMAIN_UST:
2527 nb_events = ust_app_list_events(events);
2528 if (nb_events < 0) {
f73fabfd 2529 ret = LTTNG_ERR_UST_LIST_FAIL;
2f77fc4b
DG
2530 goto error;
2531 }
2532 break;
5cdb6027 2533 case LTTNG_DOMAIN_LOG4J:
3c6a091f 2534 case LTTNG_DOMAIN_JUL:
0e115563 2535 case LTTNG_DOMAIN_PYTHON:
f60140a1 2536 nb_events = agent_list_events(events, domain);
3c6a091f
DG
2537 if (nb_events < 0) {
2538 ret = LTTNG_ERR_UST_LIST_FAIL;
2539 goto error;
2540 }
2541 break;
2f77fc4b 2542 default:
f73fabfd 2543 ret = LTTNG_ERR_UND;
2f77fc4b
DG
2544 goto error;
2545 }
2546
2547 return nb_events;
2548
2549error:
2550 /* Return negative value to differentiate return code */
2551 return -ret;
2552}
2553
2554/*
2555 * Command LTTNG_LIST_TRACEPOINT_FIELDS processed by the client thread.
2556 */
56a37563 2557ssize_t cmd_list_tracepoint_fields(enum lttng_domain_type domain,
2f77fc4b
DG
2558 struct lttng_event_field **fields)
2559{
2560 int ret;
2561 ssize_t nb_fields = 0;
2562
2563 switch (domain) {
2564 case LTTNG_DOMAIN_UST:
2565 nb_fields = ust_app_list_event_fields(fields);
2566 if (nb_fields < 0) {
f73fabfd 2567 ret = LTTNG_ERR_UST_LIST_FAIL;
2f77fc4b
DG
2568 goto error;
2569 }
2570 break;
2571 case LTTNG_DOMAIN_KERNEL:
2572 default: /* fall-through */
f73fabfd 2573 ret = LTTNG_ERR_UND;
2f77fc4b
DG
2574 goto error;
2575 }
2576
2577 return nb_fields;
2578
2579error:
2580 /* Return negative value to differentiate return code */
2581 return -ret;
2582}
2583
834978fd
DG
2584ssize_t cmd_list_syscalls(struct lttng_event **events)
2585{
2586 return syscall_table_list(events);
2587}
2588
2f77fc4b
DG
2589/*
2590 * Command LTTNG_START_TRACE processed by the client thread.
a9ad0c8f
MD
2591 *
2592 * Called with session mutex held.
2f77fc4b
DG
2593 */
2594int cmd_start_trace(struct ltt_session *session)
2595{
82b69413 2596 enum lttng_error_code ret;
cde3e505 2597 unsigned long nb_chan = 0;
2f77fc4b
DG
2598 struct ltt_kernel_session *ksession;
2599 struct ltt_ust_session *usess;
1f496244
JG
2600 const bool session_rotated_after_last_stop =
2601 session->rotated_after_last_stop;
b02f5986
MD
2602 const bool session_cleared_after_last_stop =
2603 session->cleared_after_last_stop;
2f77fc4b
DG
2604
2605 assert(session);
2606
2607 /* Ease our life a bit ;) */
2608 ksession = session->kernel_session;
2609 usess = session->ust_session;
2610
8382cf6f
DG
2611 /* Is the session already started? */
2612 if (session->active) {
f73fabfd 2613 ret = LTTNG_ERR_TRACE_ALREADY_STARTED;
7a24ece3
JR
2614 /* Perform nothing */
2615 goto end;
2f77fc4b
DG
2616 }
2617
1f496244
JG
2618 if (session->rotation_state == LTTNG_ROTATION_STATE_ONGOING &&
2619 !session->current_trace_chunk) {
2620 /*
2621 * A rotation was launched while the session was stopped and
2622 * it has not been completed yet. It is not possible to start
2623 * the session since starting the session here would require a
2624 * rotation from "NULL" to a new trace chunk. That rotation
2625 * would overlap with the ongoing rotation, which is not
2626 * supported.
2627 */
2628 WARN("Refusing to start session \"%s\" as a rotation launched after the last \"stop\" is still ongoing",
2629 session->name);
2630 ret = LTTNG_ERR_ROTATION_PENDING;
2631 goto error;
2632 }
2633
cde3e505
DG
2634 /*
2635 * Starting a session without channel is useless since after that it's not
2636 * possible to enable channel thus inform the client.
2637 */
2638 if (usess && usess->domain_global.channels) {
2639 nb_chan += lttng_ht_get_count(usess->domain_global.channels);
2640 }
2641 if (ksession) {
2642 nb_chan += ksession->channel_count;
2643 }
2644 if (!nb_chan) {
2645 ret = LTTNG_ERR_NO_CHANNEL;
2646 goto error;
2647 }
2648
1f496244
JG
2649 session->active = 1;
2650 session->rotated_after_last_stop = false;
b02f5986 2651 session->cleared_after_last_stop = false;
070b6a86 2652 if (session->output_traces && !session->current_trace_chunk) {
1f496244
JG
2653 if (!session->has_been_started) {
2654 struct lttng_trace_chunk *trace_chunk;
2655
2656 DBG("Creating initial trace chunk of session \"%s\"",
2657 session->name);
2658 trace_chunk = session_create_new_trace_chunk(
2659 session, NULL, NULL, NULL);
2660 if (!trace_chunk) {
2661 ret = LTTNG_ERR_CREATE_DIR_FAIL;
2662 goto error;
2663 }
2664 assert(!session->current_trace_chunk);
2665 ret = session_set_trace_chunk(session, trace_chunk,
2666 NULL);
2667 lttng_trace_chunk_put(trace_chunk);
2668 if (ret) {
2669 ret = LTTNG_ERR_CREATE_TRACE_CHUNK_FAIL_CONSUMER;
2670 goto error;
2671 }
2672 } else {
2673 DBG("Rotating session \"%s\" from its current \"NULL\" trace chunk to a new chunk",
2674 session->name);
2675 /*
2676 * Rotate existing streams into the new chunk.
2677 * This is a "quiet" rotation has no client has
2678 * explicitly requested this operation.
2679 *
2680 * There is also no need to wait for the rotation
2681 * to complete as it will happen immediately. No data
2682 * was produced as the session was stopped, so the
2683 * rotation should happen on reception of the command.
2684 */
343defc2
MD
2685 ret = cmd_rotate_session(session, NULL, true,
2686 LTTNG_TRACE_CHUNK_COMMAND_TYPE_NO_OPERATION);
1f496244
JG
2687 if (ret != LTTNG_OK) {
2688 goto error;
2689 }
5c408ad8 2690 }
c996624c
JD
2691 }
2692
2f77fc4b
DG
2693 /* Kernel tracing */
2694 if (ksession != NULL) {
c996624c 2695 DBG("Start kernel tracing session %s", session->name);
7d268848 2696 ret = start_kernel_session(ksession);
9b6c7ec5 2697 if (ret != LTTNG_OK) {
2f77fc4b
DG
2698 goto error;
2699 }
2f77fc4b
DG
2700 }
2701
2702 /* Flag session that trace should start automatically */
2703 if (usess) {
82b69413
JG
2704 int int_ret = ust_app_start_trace_all(usess);
2705
2706 if (int_ret < 0) {
f73fabfd 2707 ret = LTTNG_ERR_UST_START_FAIL;
2f77fc4b
DG
2708 goto error;
2709 }
2710 }
2711
04ed9e10
JG
2712 /*
2713 * Open a packet in every stream of the session to ensure that viewers
2714 * can correctly identify the boundaries of the periods during which
2715 * tracing was active for this session.
2716 */
2717 ret = session_open_packets(session);
2718 if (ret != LTTNG_OK) {
2719 goto error;
2720 }
2721
5c408ad8
JD
2722 /*
2723 * Clear the flag that indicates that a rotation was done while the
2724 * session was stopped.
2725 */
2726 session->rotated_after_last_stop = false;
2727
259c2674 2728 if (session->rotate_timer_period) {
82b69413
JG
2729 int int_ret = timer_session_rotation_schedule_timer_start(
2730 session, session->rotate_timer_period);
2731
2732 if (int_ret < 0) {
259c2674
JD
2733 ERR("Failed to enable rotate timer");
2734 ret = LTTNG_ERR_UNK;
2735 goto error;
2736 }
2737 }
2738
f73fabfd 2739 ret = LTTNG_OK;
2f77fc4b
DG
2740
2741error:
1f496244
JG
2742 if (ret == LTTNG_OK) {
2743 /* Flag this after a successful start. */
2744 session->has_been_started |= 1;
2745 } else {
2746 session->active = 0;
2747 /* Restore initial state on error. */
2748 session->rotated_after_last_stop =
2749 session_rotated_after_last_stop;
b02f5986
MD
2750 session->cleared_after_last_stop =
2751 session_cleared_after_last_stop;
1f496244 2752 }
7a24ece3 2753end:
2f77fc4b
DG
2754 return ret;
2755}
2756
2757/*
2758 * Command LTTNG_STOP_TRACE processed by the client thread.
2759 */
2760int cmd_stop_trace(struct ltt_session *session)
2761{
2762 int ret;
2f77fc4b
DG
2763 struct ltt_kernel_session *ksession;
2764 struct ltt_ust_session *usess;
2765
2766 assert(session);
2767
4dbe1875 2768 DBG("Begin stop session \"%s\" (id %" PRIu64 ")", session->name, session->id);
2f77fc4b
DG
2769 /* Short cut */
2770 ksession = session->kernel_session;
2771 usess = session->ust_session;
2772
8382cf6f
DG
2773 /* Session is not active. Skip everythong and inform the client. */
2774 if (!session->active) {
f73fabfd 2775 ret = LTTNG_ERR_TRACE_ALREADY_STOPPED;
2f77fc4b
DG
2776 goto error;
2777 }
2778
4dbe1875
MD
2779 ret = stop_kernel_session(ksession);
2780 if (ret != LTTNG_OK) {
2781 goto error;
2f77fc4b
DG
2782 }
2783
14fb1ebe 2784 if (usess && usess->active) {
2f77fc4b
DG
2785 ret = ust_app_stop_trace_all(usess);
2786 if (ret < 0) {
f73fabfd 2787 ret = LTTNG_ERR_UST_STOP_FAIL;
2f77fc4b
DG
2788 goto error;
2789 }
2790 }
2791
4dbe1875
MD
2792 DBG("Completed stop session \"%s\" (id %" PRIu64 ")", session->name,
2793 session->id);
8382cf6f
DG
2794 /* Flag inactive after a successful stop. */
2795 session->active = 0;
4dbe1875 2796 ret = LTTNG_OK;
2f77fc4b
DG
2797
2798error:
2799 return ret;
2800}
2801
2802/*
433f5ba9
JR
2803 * Set the base_path of the session only if subdir of a control uris is set.
2804 * Return LTTNG_OK on success, otherwise LTTNG_ERR_*.
2f77fc4b 2805 */
433f5ba9
JR
2806static int set_session_base_path_from_uris(struct ltt_session *session,
2807 size_t nb_uri,
bda32d56 2808 struct lttng_uri *uris)
2f77fc4b 2809{
433f5ba9
JR
2810 int ret;
2811 size_t i;
2f77fc4b 2812
e3876bf0
JR
2813 for (i = 0; i < nb_uri; i++) {
2814 if (uris[i].stype != LTTNG_STREAM_CONTROL ||
2815 uris[i].subdir[0] == '\0') {
2816 /* Not interested in these URIs */
2817 continue;
2818 }
2819
2820 if (session->base_path != NULL) {
2821 free(session->base_path);
2822 session->base_path = NULL;
2823 }
2824
2825 /* Set session base_path */
2826 session->base_path = strdup(uris[i].subdir);
2827 if (!session->base_path) {
433f5ba9
JR
2828 PERROR("Failed to copy base path \"%s\" to session \"%s\"",
2829 uris[i].subdir, session->name);
2830 ret = LTTNG_ERR_NOMEM;
e3876bf0
JR
2831 goto error;
2832 }
433f5ba9
JR
2833 DBG2("Setting base path \"%s\" for session \"%s\"",
2834 session->base_path, session->name);
2835 }
2836 ret = LTTNG_OK;
2837error:
2838 return ret;
2839}
2840
2841/*
2842 * Command LTTNG_SET_CONSUMER_URI processed by the client thread.
2843 */
2844int cmd_set_consumer_uri(struct ltt_session *session, size_t nb_uri,
2845 struct lttng_uri *uris)
2846{
2847 int ret, i;
2848 struct ltt_kernel_session *ksess = session->kernel_session;
2849 struct ltt_ust_session *usess = session->ust_session;
2850
2851 assert(session);
2852 assert(uris);
2853 assert(nb_uri > 0);
2854
2855 /* Can't set consumer URI if the session is active. */
2856 if (session->active) {
2857 ret = LTTNG_ERR_TRACE_ALREADY_STARTED;
2858 goto error;
2859 }
2860
2861 /*
2862 * Set the session base path if any. This is done inside
2863 * cmd_set_consumer_uri to preserve backward compatibility of the
2864 * previous session creation api vs the session descriptor api.
2865 */
2866 ret = set_session_base_path_from_uris(session, nb_uri, uris);
2867 if (ret != LTTNG_OK) {
2868 goto error;
e3876bf0
JR
2869 }
2870
bda32d56 2871 /* Set the "global" consumer URIs */
2f77fc4b 2872 for (i = 0; i < nb_uri; i++) {
e3876bf0
JR
2873 ret = add_uri_to_consumer(session, session->consumer, &uris[i],
2874 LTTNG_DOMAIN_NONE);
a74934ba 2875 if (ret != LTTNG_OK) {
2f77fc4b
DG
2876 goto error;
2877 }
2f77fc4b
DG
2878 }
2879
bda32d56
JG
2880 /* Set UST session URIs */
2881 if (session->ust_session) {
2882 for (i = 0; i < nb_uri; i++) {
b178f53e 2883 ret = add_uri_to_consumer(session,
bda32d56 2884 session->ust_session->consumer,
b178f53e 2885 &uris[i], LTTNG_DOMAIN_UST);
bda32d56
JG
2886 if (ret != LTTNG_OK) {
2887 goto error;
2888 }
2889 }
2890 }
2891
2892 /* Set kernel session URIs */
2893 if (session->kernel_session) {
2894 for (i = 0; i < nb_uri; i++) {
b178f53e 2895 ret = add_uri_to_consumer(session,
bda32d56 2896 session->kernel_session->consumer,
b178f53e 2897 &uris[i], LTTNG_DOMAIN_KERNEL);
bda32d56
JG
2898 if (ret != LTTNG_OK) {
2899 goto error;
2900 }
2901 }
2902 }
2903
7ab70fe0
DG
2904 /*
2905 * Make sure to set the session in output mode after we set URI since a
2906 * session can be created without URL (thus flagged in no output mode).
2907 */
2908 session->output_traces = 1;
2909 if (ksess) {
2910 ksess->output_traces = 1;
bda32d56
JG
2911 }
2912
2913 if (usess) {
7ab70fe0
DG
2914 usess->output_traces = 1;
2915 }
2916
2f77fc4b 2917 /* All good! */
f73fabfd 2918 ret = LTTNG_OK;
2f77fc4b
DG
2919
2920error:
2921 return ret;
2922}
2923
b178f53e
JG
2924static
2925enum lttng_error_code set_session_output_from_descriptor(
2926 struct ltt_session *session,
2927 const struct lttng_session_descriptor *descriptor)
2f77fc4b
DG
2928{
2929 int ret;
b178f53e
JG
2930 enum lttng_error_code ret_code = LTTNG_OK;
2931 enum lttng_session_descriptor_type session_type =
2932 lttng_session_descriptor_get_type(descriptor);
2933 enum lttng_session_descriptor_output_type output_type =
2934 lttng_session_descriptor_get_output_type(descriptor);
2935 struct lttng_uri uris[2] = {};
2936 size_t uri_count = 0;
2937
2938 switch (output_type) {
2939 case LTTNG_SESSION_DESCRIPTOR_OUTPUT_TYPE_NONE:
2940 goto end;
2941 case LTTNG_SESSION_DESCRIPTOR_OUTPUT_TYPE_LOCAL:
2942 lttng_session_descriptor_get_local_output_uri(descriptor,
2943 &uris[0]);
2944 uri_count = 1;
2945 break;
2946 case LTTNG_SESSION_DESCRIPTOR_OUTPUT_TYPE_NETWORK:
2947 lttng_session_descriptor_get_network_output_uris(descriptor,
2948 &uris[0], &uris[1]);
2949 uri_count = 2;
2950 break;
2951 default:
2952 ret_code = LTTNG_ERR_INVALID;
e32d7f27 2953 goto end;
2f77fc4b
DG
2954 }
2955
b178f53e
JG
2956 switch (session_type) {
2957 case LTTNG_SESSION_DESCRIPTOR_TYPE_SNAPSHOT:
2958 {
2959 struct snapshot_output *new_output = NULL;
2960
2961 new_output = snapshot_output_alloc();
2962 if (!new_output) {
2963 ret_code = LTTNG_ERR_NOMEM;
2964 goto end;
2965 }
2966
2967 ret = snapshot_output_init_with_uri(session,
2968 DEFAULT_SNAPSHOT_MAX_SIZE,
2969 NULL, uris, uri_count, session->consumer,
2970 new_output, &session->snapshot);
2971 if (ret < 0) {
2972 ret_code = (ret == -ENOMEM) ?
2973 LTTNG_ERR_NOMEM : LTTNG_ERR_INVALID;
2974 snapshot_output_destroy(new_output);
2975 goto end;
2976 }
2977 snapshot_add_output(&session->snapshot, new_output);
2978 break;
2979 }
2980 case LTTNG_SESSION_DESCRIPTOR_TYPE_REGULAR:
2981 case LTTNG_SESSION_DESCRIPTOR_TYPE_LIVE:
2982 {
2983 ret_code = cmd_set_consumer_uri(session, uri_count, uris);
2984 break;
2985 }
2986 default:
2987 ret_code = LTTNG_ERR_INVALID;
e32d7f27 2988 goto end;
2f77fc4b 2989 }
b178f53e
JG
2990end:
2991 return ret_code;
2992}
2993
2994static
2995enum lttng_error_code cmd_create_session_from_descriptor(
2996 struct lttng_session_descriptor *descriptor,
2997 const lttng_sock_cred *creds,
2998 const char *home_path)
2999{
3000 int ret;
3001 enum lttng_error_code ret_code;
3002 const char *session_name;
3003 struct ltt_session *new_session = NULL;
3004 enum lttng_session_descriptor_status descriptor_status;
2f77fc4b 3005
e32d7f27 3006 session_lock_list();
b178f53e
JG
3007 if (home_path) {
3008 if (*home_path != '/') {
3009 ERR("Home path provided by client is not absolute");
3010 ret_code = LTTNG_ERR_INVALID;
3011 goto end;
3012 }
3013 }
2f77fc4b 3014
b178f53e
JG
3015 descriptor_status = lttng_session_descriptor_get_session_name(
3016 descriptor, &session_name);
3017 switch (descriptor_status) {
3018 case LTTNG_SESSION_DESCRIPTOR_STATUS_OK:
3019 break;
3020 case LTTNG_SESSION_DESCRIPTOR_STATUS_UNSET:
3021 session_name = NULL;
3022 break;
3023 default:
3024 ret_code = LTTNG_ERR_INVALID;
3025 goto end;
3026 }
e3876bf0 3027
b178f53e 3028 ret_code = session_create(session_name, creds->uid, creds->gid,
e3876bf0 3029 &new_session);
b178f53e 3030 if (ret_code != LTTNG_OK) {
e32d7f27 3031 goto end;
2f77fc4b
DG
3032 }
3033
b178f53e
JG
3034 if (!session_name) {
3035 ret = lttng_session_descriptor_set_session_name(descriptor,
3036 new_session->name);
3037 if (ret) {
3038 ret_code = LTTNG_ERR_SESSION_FAIL;
3039 goto end;
3040 }
3041 }
3042
3043 if (!lttng_session_descriptor_is_output_destination_initialized(
3044 descriptor)) {
3045 /*
3046 * Only include the session's creation time in the output
3047 * destination if the name of the session itself was
3048 * not auto-generated.
3049 */
3050 ret_code = lttng_session_descriptor_set_default_output(
3051 descriptor,
3052 session_name ? &new_session->creation_time : NULL,
3053 home_path);
3054 if (ret_code != LTTNG_OK) {
e32d7f27 3055 goto end;
2bba9e53 3056 }
2bba9e53 3057 } else {
b178f53e
JG
3058 new_session->has_user_specified_directory =
3059 lttng_session_descriptor_has_output_directory(
3060 descriptor);
2f77fc4b
DG
3061 }
3062
b178f53e
JG
3063 switch (lttng_session_descriptor_get_type(descriptor)) {
3064 case LTTNG_SESSION_DESCRIPTOR_TYPE_SNAPSHOT:
3065 new_session->snapshot_mode = 1;
3066 break;
3067 case LTTNG_SESSION_DESCRIPTOR_TYPE_LIVE:
3068 new_session->live_timer =
3069 lttng_session_descriptor_live_get_timer_interval(
3070 descriptor);
3071 break;
3072 default:
3073 break;
3074 }
2f77fc4b 3075
b178f53e
JG
3076 ret_code = set_session_output_from_descriptor(new_session, descriptor);
3077 if (ret_code != LTTNG_OK) {
3078 goto end;
3079 }
3080 new_session->consumer->enabled = 1;
3081 ret_code = LTTNG_OK;
e32d7f27 3082end:
b178f53e
JG
3083 /* Release reference provided by the session_create function. */
3084 session_put(new_session);
3085 if (ret_code != LTTNG_OK && new_session) {
3086 /* Release the global reference on error. */
3087 session_destroy(new_session);
e32d7f27 3088 }
b178f53e
JG
3089 session_unlock_list();
3090 return ret_code;
2f77fc4b
DG
3091}
3092
b178f53e
JG
3093enum lttng_error_code cmd_create_session(struct command_ctx *cmd_ctx, int sock,
3094 struct lttng_session_descriptor **return_descriptor)
27babd3a
DG
3095{
3096 int ret;
b178f53e
JG
3097 size_t payload_size;
3098 struct lttng_dynamic_buffer payload;
3099 struct lttng_buffer_view home_dir_view;
3100 struct lttng_buffer_view session_descriptor_view;
3101 struct lttng_session_descriptor *session_descriptor = NULL;
3102 enum lttng_error_code ret_code;
3103
3104 lttng_dynamic_buffer_init(&payload);
3a91de3a 3105 if (cmd_ctx->lsm.u.create_session.home_dir_size >=
b178f53e
JG
3106 LTTNG_PATH_MAX) {
3107 ret_code = LTTNG_ERR_INVALID;
3108 goto error;
27babd3a 3109 }
3a91de3a 3110 if (cmd_ctx->lsm.u.create_session.session_descriptor_size >
b178f53e
JG
3111 LTTNG_SESSION_DESCRIPTOR_MAX_LEN) {
3112 ret_code = LTTNG_ERR_INVALID;
3113 goto error;
27babd3a
DG
3114 }
3115
3a91de3a
JG
3116 payload_size = cmd_ctx->lsm.u.create_session.home_dir_size +
3117 cmd_ctx->lsm.u.create_session.session_descriptor_size;
b178f53e
JG
3118 ret = lttng_dynamic_buffer_set_size(&payload, payload_size);
3119 if (ret) {
3120 ret_code = LTTNG_ERR_NOMEM;
3121 goto error;
27babd3a
DG
3122 }
3123
b178f53e
JG
3124 ret = lttcomm_recv_unix_sock(sock, payload.data, payload.size);
3125 if (ret <= 0) {
3126 ERR("Reception of session descriptor failed, aborting.");
3127 ret_code = LTTNG_ERR_SESSION_FAIL;
3128 goto error;
27babd3a
DG
3129 }
3130
b178f53e
JG
3131 home_dir_view = lttng_buffer_view_from_dynamic_buffer(
3132 &payload,
3133 0,
3a91de3a 3134 cmd_ctx->lsm.u.create_session.home_dir_size);
3e6e0df2
JG
3135 if (cmd_ctx->lsm.u.create_session.home_dir_size > 0 &&
3136 !lttng_buffer_view_is_valid(&home_dir_view)) {
3137 ERR("Invalid payload in \"create session\" command: buffer too short to contain home directory");
3138 ret_code = LTTNG_ERR_INVALID_PROTOCOL;
3139 goto error;
3140 }
3141
b178f53e
JG
3142 session_descriptor_view = lttng_buffer_view_from_dynamic_buffer(
3143 &payload,
3a91de3a
JG
3144 cmd_ctx->lsm.u.create_session.home_dir_size,
3145 cmd_ctx->lsm.u.create_session.session_descriptor_size);
3e6e0df2
JG
3146 if (!lttng_buffer_view_is_valid(&session_descriptor_view)) {
3147 ERR("Invalid payload in \"create session\" command: buffer too short to contain session descriptor");
3148 ret_code = LTTNG_ERR_INVALID_PROTOCOL;
3149 goto error;
3150 }
27babd3a 3151
b178f53e
JG
3152 ret = lttng_session_descriptor_create_from_buffer(
3153 &session_descriptor_view, &session_descriptor);
3154 if (ret < 0) {
3155 ERR("Failed to create session descriptor from payload of \"create session\" command");
3156 ret_code = LTTNG_ERR_INVALID;
3157 goto error;
3158 }
27babd3a 3159
b178f53e
JG
3160 /*
3161 * Sets the descriptor's auto-generated properties (name, output) if
3162 * needed.
3163 */
3164 ret_code = cmd_create_session_from_descriptor(session_descriptor,
3165 &cmd_ctx->creds,
3166 home_dir_view.size ? home_dir_view.data : NULL);
3167 if (ret_code != LTTNG_OK) {
3168 goto error;
e32d7f27 3169 }
b178f53e
JG
3170
3171 ret_code = LTTNG_OK;
3172 *return_descriptor = session_descriptor;
3173 session_descriptor = NULL;
3174error:
3175 lttng_dynamic_buffer_reset(&payload);
3176 lttng_session_descriptor_destroy(session_descriptor);
3177 return ret_code;
27babd3a
DG
3178}
3179
3e3665b8
JG
3180static
3181void cmd_destroy_session_reply(const struct ltt_session *session,
3182 void *_reply_context)
3183{
3184 int ret;
3185 ssize_t comm_ret;
3186 const struct cmd_destroy_session_reply_context *reply_context =
3187 _reply_context;
3188 struct lttng_dynamic_buffer payload;
3189 struct lttcomm_session_destroy_command_header cmd_header;
3190 struct lttng_trace_archive_location *location = NULL;
3191 struct lttcomm_lttng_msg llm = {
3192 .cmd_type = LTTNG_DESTROY_SESSION,
3285a971 3193 .ret_code = reply_context->destruction_status,
3e3665b8
JG
3194 .pid = UINT32_MAX,
3195 .cmd_header_size =
3196 sizeof(struct lttcomm_session_destroy_command_header),
3197 .data_size = 0,
3198 };
3199 size_t payload_size_before_location;
3200
3201 lttng_dynamic_buffer_init(&payload);
3202
3203 ret = lttng_dynamic_buffer_append(&payload, &llm, sizeof(llm));
0e270a1e 3204 if (ret) {
3e3665b8
JG
3205 ERR("Failed to append session destruction message");
3206 goto error;
0e270a1e 3207 }
3e3665b8
JG
3208
3209 cmd_header.rotation_state =
3210 (int32_t) (reply_context->implicit_rotation_on_destroy ?
3211 session->rotation_state :
3212 LTTNG_ROTATION_STATE_NO_ROTATION);
3213 ret = lttng_dynamic_buffer_append(&payload, &cmd_header,
3214 sizeof(cmd_header));
3215 if (ret) {
3216 ERR("Failed to append session destruction command header");
3217 goto error;
3218 }
3219
3220 if (!reply_context->implicit_rotation_on_destroy) {
3221 DBG("No implicit rotation performed during the destruction of session \"%s\", sending reply",
3222 session->name);
3223 goto send_reply;
3224 }
3225 if (session->rotation_state != LTTNG_ROTATION_STATE_COMPLETED) {
3226 DBG("Rotation state of session \"%s\" is not \"completed\", sending session destruction reply",
3227 session->name);
3228 goto send_reply;
3229 }
3230
3231 location = session_get_trace_archive_location(session);
3232 if (!location) {
3233 ERR("Failed to get the location of the trace archive produced during the destruction of session \"%s\"",
3234 session->name);
3235 goto error;
3236 }
3237
3238 payload_size_before_location = payload.size;
3239 comm_ret = lttng_trace_archive_location_serialize(location,
3240 &payload);
3241 if (comm_ret < 0) {
3242 ERR("Failed to serialize the location of the trace archive produced during the destruction of session \"%s\"",
3243 session->name);
3244 goto error;
3245 }
3246 /* Update the message to indicate the location's length. */
3247 ((struct lttcomm_lttng_msg *) payload.data)->data_size =
3248 payload.size - payload_size_before_location;
3249send_reply:
3250 comm_ret = lttcomm_send_unix_sock(reply_context->reply_sock_fd,
3251 payload.data, payload.size);
3252 if (comm_ret != (ssize_t) payload.size) {
3253 ERR("Failed to send result of the destruction of session \"%s\" to client",
3254 session->name);
3255 }
3256error:
3257 ret = close(reply_context->reply_sock_fd);
3258 if (ret) {
3259 PERROR("Failed to close client socket in deferred session destroy reply");
3260 }
3261 lttng_dynamic_buffer_reset(&payload);
3262 free(_reply_context);
3263}
3264
2f77fc4b
DG
3265/*
3266 * Command LTTNG_DESTROY_SESSION processed by the client thread.
a9ad0c8f
MD
3267 *
3268 * Called with session lock held.
2f77fc4b 3269 */
e32d7f27 3270int cmd_destroy_session(struct ltt_session *session,
3e3665b8
JG
3271 struct notification_thread_handle *notification_thread_handle,
3272 int *sock_fd)
2f77fc4b
DG
3273{