2 * Copyright (C) 2011 EfficiOS Inc.
3 * Copyright (C) 2011 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
4 * Copyright (C) 2013 Jérémie Galarneau <jeremie.galarneau@efficios.com>
6 * SPDX-License-Identifier: GPL-2.0-only
10 #include "common/buffer-view.h"
11 #include "common/compat/socket.h"
12 #include "common/dynamic-array.h"
13 #include "common/dynamic-buffer.h"
14 #include "common/fd-handle.h"
15 #include "common/payload-view.h"
16 #include "common/payload.h"
17 #include "common/sessiond-comm/sessiond-comm.h"
18 #include "lttng/lttng-error.h"
19 #include "lttng/tracker.h"
20 #include <common/compat/getenv.h>
21 #include <common/tracker.h>
22 #include <common/unix.h>
23 #include <common/utils.h>
24 #include <lttng/error-query-internal.h>
25 #include <lttng/event-internal.h>
26 #include <lttng/session-descriptor-internal.h>
27 #include <lttng/session-internal.h>
28 #include <lttng/userspace-probe-internal.h>
36 #include "agent-thread.h"
40 #include "health-sessiond.h"
42 #include "lttng-sessiond.h"
43 #include "manage-consumer.h"
45 #include "testpoint.h"
50 static struct thread_state
{
56 static void set_thread_status(bool running
)
58 DBG("Marking client thread's state as %s", running
? "running" : "error");
59 thread_state
.running
= running
;
60 sem_post(&thread_state
.ready
);
63 static bool wait_thread_status(void)
65 DBG("Waiting for client thread to be ready");
66 sem_wait(&thread_state
.ready
);
67 if (thread_state
.running
) {
68 DBG("Client thread is ready");
70 ERR("Initialization of client thread failed");
73 return thread_state
.running
;
77 * Setup the outgoing data buffer for the response (llm) by allocating the
78 * right amount of memory and copying the original information from the lsm
81 * Return 0 on success, negative value on error.
83 static int setup_lttng_msg(struct command_ctx
*cmd_ctx
,
84 const void *payload_buf
, size_t payload_len
,
85 const void *cmd_header_buf
, size_t cmd_header_len
)
88 const size_t header_len
= sizeof(struct lttcomm_lttng_msg
);
89 const size_t total_msg_size
= header_len
+ cmd_header_len
+ payload_len
;
90 lttcomm_lttng_msg llm
{};
92 llm
.cmd_type
= cmd_ctx
->lsm
.cmd_type
;
93 llm
.pid
= (uint32_t) cmd_ctx
->lsm
.domain
.attr
.pid
;
94 llm
.cmd_header_size
= (uint32_t) cmd_header_len
;
95 llm
.data_size
= (uint32_t) payload_len
;
97 ret
= lttng_dynamic_buffer_set_size(&cmd_ctx
->reply_payload
.buffer
, 0);
102 lttng_dynamic_pointer_array_clear(&cmd_ctx
->reply_payload
._fd_handles
);
104 cmd_ctx
->lttng_msg_size
= total_msg_size
;
106 /* Append reply header. */
107 ret
= lttng_dynamic_buffer_append(
108 &cmd_ctx
->reply_payload
.buffer
, &llm
, sizeof(llm
));
113 /* Append command header. */
114 if (cmd_header_len
) {
115 ret
= lttng_dynamic_buffer_append(
116 &cmd_ctx
->reply_payload
.buffer
, cmd_header_buf
,
123 /* Append payload. */
125 ret
= lttng_dynamic_buffer_append(
126 &cmd_ctx
->reply_payload
.buffer
, payload_buf
,
137 static int setup_empty_lttng_msg(struct command_ctx
*cmd_ctx
)
140 const struct lttcomm_lttng_msg llm
= {};
142 ret
= lttng_dynamic_buffer_set_size(&cmd_ctx
->reply_payload
.buffer
, 0);
147 /* Append place-holder reply header. */
148 ret
= lttng_dynamic_buffer_append(
149 &cmd_ctx
->reply_payload
.buffer
, &llm
, sizeof(llm
));
154 cmd_ctx
->lttng_msg_size
= sizeof(llm
);
159 static void update_lttng_msg(struct command_ctx
*cmd_ctx
, size_t cmd_header_len
,
162 const size_t header_len
= sizeof(struct lttcomm_lttng_msg
);
163 const size_t total_msg_size
= header_len
+ cmd_header_len
+ payload_len
;
164 struct lttcomm_lttng_msg
*p_llm
;
165 lttcomm_lttng_msg llm
{};
167 llm
.cmd_type
= cmd_ctx
->lsm
.cmd_type
;
168 llm
.pid
= (uint32_t) cmd_ctx
->lsm
.domain
.attr
.pid
;
169 llm
.cmd_header_size
= (uint32_t) cmd_header_len
;
170 llm
.data_size
= (uint32_t) payload_len
;
172 LTTNG_ASSERT(cmd_ctx
->reply_payload
.buffer
.size
>= sizeof(llm
));
174 p_llm
= (typeof(p_llm
)) cmd_ctx
->reply_payload
.buffer
.data
;
176 /* Update existing header. */
177 memcpy(p_llm
, &llm
, sizeof(llm
));
179 cmd_ctx
->lttng_msg_size
= total_msg_size
;
183 * Start the thread_manage_consumer. This must be done after a lttng-consumerd
184 * exec or it will fail.
186 static int spawn_consumer_thread(struct consumer_data
*consumer_data
)
188 return launch_consumer_management_thread(consumer_data
) ? 0 : -1;
192 * Fork and exec a consumer daemon (consumerd).
194 * Return pid if successful else -1.
196 static pid_t
spawn_consumerd(struct consumer_data
*consumer_data
)
200 const char *consumer_to_use
;
201 const char *verbosity
;
204 DBG("Spawning consumerd");
211 if (the_config
.verbose_consumer
) {
212 verbosity
= "--verbose";
213 } else if (lttng_opt_quiet
) {
214 verbosity
= "--quiet";
219 switch (consumer_data
->type
) {
220 case LTTNG_CONSUMER_KERNEL
:
222 * Find out which consumerd to execute. We will first try the
223 * 64-bit path, then the sessiond's installation directory, and
224 * fallback on the 32-bit one,
226 DBG3("Looking for a kernel consumer at these locations:");
227 DBG3(" 1) %s", the_config
.consumerd64_bin_path
.value
? : "NULL");
228 DBG3(" 2) %s/%s", INSTALL_BIN_PATH
, DEFAULT_CONSUMERD_FILE
);
229 DBG3(" 3) %s", the_config
.consumerd32_bin_path
.value
? : "NULL");
230 if (stat(the_config
.consumerd64_bin_path
.value
, &st
) == 0) {
231 DBG3("Found location #1");
232 consumer_to_use
= the_config
.consumerd64_bin_path
.value
;
233 } else if (stat(INSTALL_BIN_PATH
"/" DEFAULT_CONSUMERD_FILE
, &st
) == 0) {
234 DBG3("Found location #2");
235 consumer_to_use
= INSTALL_BIN_PATH
"/" DEFAULT_CONSUMERD_FILE
;
236 } else if (the_config
.consumerd32_bin_path
.value
&&
237 stat(the_config
.consumerd32_bin_path
.value
, &st
) == 0) {
238 DBG3("Found location #3");
239 consumer_to_use
= the_config
.consumerd32_bin_path
.value
;
241 DBG("Could not find any valid consumerd executable");
245 DBG("Using kernel consumer at: %s", consumer_to_use
);
246 (void) execl(consumer_to_use
, "lttng-consumerd",
247 verbosity
, "-k", "--consumerd-cmd-sock",
248 consumer_data
->cmd_unix_sock_path
,
249 "--consumerd-err-sock",
250 consumer_data
->err_unix_sock_path
,
252 the_config
.tracing_group_name
.value
,
255 case LTTNG_CONSUMER64_UST
:
257 if (the_config
.consumerd64_lib_dir
.value
) {
262 tmp
= lttng_secure_getenv("LD_LIBRARY_PATH");
266 tmplen
= strlen(the_config
.consumerd64_lib_dir
.value
) + 1 /* : */ + strlen(tmp
);
267 tmpnew
= (char *) zmalloc(tmplen
+ 1 /* \0 */);
272 strcat(tmpnew
, the_config
.consumerd64_lib_dir
.value
);
273 if (tmp
[0] != '\0') {
277 ret
= setenv("LD_LIBRARY_PATH", tmpnew
, 1);
284 DBG("Using 64-bit UST consumer at: %s",
285 the_config
.consumerd64_bin_path
.value
);
286 (void) execl(the_config
.consumerd64_bin_path
.value
,
287 "lttng-consumerd", verbosity
, "-u",
288 "--consumerd-cmd-sock",
289 consumer_data
->cmd_unix_sock_path
,
290 "--consumerd-err-sock",
291 consumer_data
->err_unix_sock_path
,
293 the_config
.tracing_group_name
.value
,
297 case LTTNG_CONSUMER32_UST
:
299 if (the_config
.consumerd32_lib_dir
.value
) {
304 tmp
= lttng_secure_getenv("LD_LIBRARY_PATH");
308 tmplen
= strlen(the_config
.consumerd32_lib_dir
.value
) + 1 /* : */ + strlen(tmp
);
309 tmpnew
= (char *) zmalloc(tmplen
+ 1 /* \0 */);
314 strcat(tmpnew
, the_config
.consumerd32_lib_dir
.value
);
315 if (tmp
[0] != '\0') {
319 ret
= setenv("LD_LIBRARY_PATH", tmpnew
, 1);
326 DBG("Using 32-bit UST consumer at: %s",
327 the_config
.consumerd32_bin_path
.value
);
328 (void) execl(the_config
.consumerd32_bin_path
.value
,
329 "lttng-consumerd", verbosity
, "-u",
330 "--consumerd-cmd-sock",
331 consumer_data
->cmd_unix_sock_path
,
332 "--consumerd-err-sock",
333 consumer_data
->err_unix_sock_path
,
335 the_config
.tracing_group_name
.value
,
340 ERR("unknown consumer type");
344 PERROR("Consumer execl()");
346 /* Reaching this point, we got a failure on our execl(). */
348 } else if (pid
> 0) {
351 PERROR("start consumer fork");
359 * Spawn the consumerd daemon and session daemon thread.
361 static int start_consumerd(struct consumer_data
*consumer_data
)
366 * Set the listen() state on the socket since there is a possible race
367 * between the exec() of the consumer daemon and this call if place in the
368 * consumer thread. See bug #366 for more details.
370 ret
= lttcomm_listen_unix_sock(consumer_data
->err_sock
);
375 pthread_mutex_lock(&consumer_data
->pid_mutex
);
376 if (consumer_data
->pid
!= 0) {
377 pthread_mutex_unlock(&consumer_data
->pid_mutex
);
381 ret
= spawn_consumerd(consumer_data
);
383 ERR("Spawning consumerd failed");
384 pthread_mutex_unlock(&consumer_data
->pid_mutex
);
388 /* Setting up the consumer_data pid */
389 consumer_data
->pid
= ret
;
390 DBG2("Consumer pid %d", consumer_data
->pid
);
391 pthread_mutex_unlock(&consumer_data
->pid_mutex
);
393 DBG2("Spawning consumer control thread");
394 ret
= spawn_consumer_thread(consumer_data
);
396 ERR("Fatal error spawning consumer control thread");
404 /* Cleanup already created sockets on error. */
405 if (consumer_data
->err_sock
>= 0) {
408 err
= close(consumer_data
->err_sock
);
410 PERROR("close consumer data error socket");
417 * Copy consumer output from the tracing session to the domain session. The
418 * function also applies the right modification on a per domain basis for the
419 * trace files destination directory.
421 static int copy_session_consumer(int domain
, struct ltt_session
*session
)
424 const char *dir_name
;
425 struct consumer_output
*consumer
;
427 LTTNG_ASSERT(session
);
428 LTTNG_ASSERT(session
->consumer
);
431 case LTTNG_DOMAIN_KERNEL
:
432 DBG3("Copying tracing session consumer output in kernel session");
434 * XXX: We should audit the session creation and what this function
435 * does "extra" in order to avoid a destroy since this function is used
436 * in the domain session creation (kernel and ust) only. Same for UST
439 if (session
->kernel_session
->consumer
) {
440 consumer_output_put(session
->kernel_session
->consumer
);
442 session
->kernel_session
->consumer
=
443 consumer_copy_output(session
->consumer
);
444 /* Ease our life a bit for the next part */
445 consumer
= session
->kernel_session
->consumer
;
446 dir_name
= DEFAULT_KERNEL_TRACE_DIR
;
448 case LTTNG_DOMAIN_JUL
:
449 case LTTNG_DOMAIN_LOG4J
:
450 case LTTNG_DOMAIN_PYTHON
:
451 case LTTNG_DOMAIN_UST
:
452 DBG3("Copying tracing session consumer output in UST session");
453 if (session
->ust_session
->consumer
) {
454 consumer_output_put(session
->ust_session
->consumer
);
456 session
->ust_session
->consumer
=
457 consumer_copy_output(session
->consumer
);
458 /* Ease our life a bit for the next part */
459 consumer
= session
->ust_session
->consumer
;
460 dir_name
= DEFAULT_UST_TRACE_DIR
;
463 ret
= LTTNG_ERR_UNKNOWN_DOMAIN
;
467 /* Append correct directory to subdir */
468 ret
= lttng_strncpy(consumer
->domain_subdir
, dir_name
,
469 sizeof(consumer
->domain_subdir
));
474 DBG3("Copy session consumer subdir %s", consumer
->domain_subdir
);
482 * Create an UST session and add it to the session ust list.
484 static int create_ust_session(struct ltt_session
*session
,
485 const struct lttng_domain
*domain
)
488 struct ltt_ust_session
*lus
= NULL
;
490 LTTNG_ASSERT(session
);
491 LTTNG_ASSERT(domain
);
492 LTTNG_ASSERT(session
->consumer
);
494 switch (domain
->type
) {
495 case LTTNG_DOMAIN_JUL
:
496 case LTTNG_DOMAIN_LOG4J
:
497 case LTTNG_DOMAIN_PYTHON
:
498 case LTTNG_DOMAIN_UST
:
501 ERR("Unknown UST domain on create session %d", domain
->type
);
502 ret
= LTTNG_ERR_UNKNOWN_DOMAIN
;
506 DBG("Creating UST session");
508 lus
= trace_ust_create_session(session
->id
);
510 ret
= LTTNG_ERR_UST_SESS_FAIL
;
514 lus
->uid
= session
->uid
;
515 lus
->gid
= session
->gid
;
516 lus
->output_traces
= session
->output_traces
;
517 lus
->snapshot_mode
= session
->snapshot_mode
;
518 lus
->live_timer_interval
= session
->live_timer
;
519 session
->ust_session
= lus
;
520 if (session
->shm_path
[0]) {
521 strncpy(lus
->root_shm_path
, session
->shm_path
,
522 sizeof(lus
->root_shm_path
));
523 lus
->root_shm_path
[sizeof(lus
->root_shm_path
) - 1] = '\0';
524 strncpy(lus
->shm_path
, session
->shm_path
,
525 sizeof(lus
->shm_path
));
526 lus
->shm_path
[sizeof(lus
->shm_path
) - 1] = '\0';
527 strncat(lus
->shm_path
, "/ust",
528 sizeof(lus
->shm_path
) - strlen(lus
->shm_path
) - 1);
530 /* Copy session output to the newly created UST session */
531 ret
= copy_session_consumer(domain
->type
, session
);
532 if (ret
!= LTTNG_OK
) {
540 session
->ust_session
= NULL
;
545 * Create a kernel tracer session then create the default channel.
547 static int create_kernel_session(struct ltt_session
*session
)
551 DBG("Creating kernel session");
553 ret
= kernel_create_session(session
);
555 ret
= LTTNG_ERR_KERN_SESS_FAIL
;
559 /* Code flow safety */
560 LTTNG_ASSERT(session
->kernel_session
);
562 /* Copy session output to the newly created Kernel session */
563 ret
= copy_session_consumer(LTTNG_DOMAIN_KERNEL
, session
);
564 if (ret
!= LTTNG_OK
) {
568 session
->kernel_session
->uid
= session
->uid
;
569 session
->kernel_session
->gid
= session
->gid
;
570 session
->kernel_session
->output_traces
= session
->output_traces
;
571 session
->kernel_session
->snapshot_mode
= session
->snapshot_mode
;
572 session
->kernel_session
->is_live_session
= session
->live_timer
!= 0;
577 trace_kernel_destroy_session(session
->kernel_session
);
578 session
->kernel_session
= NULL
;
584 * Count number of session permitted by uid/gid.
586 static unsigned int lttng_sessions_count(uid_t uid
, gid_t gid
)
589 struct ltt_session
*session
;
590 const struct ltt_session_list
*session_list
= session_get_list();
592 DBG("Counting number of available session for UID %d", uid
);
593 cds_list_for_each_entry(session
, &session_list
->head
, list
) {
594 if (!session_get(session
)) {
597 session_lock(session
);
598 /* Only count the sessions the user can control. */
599 if (session_access_ok(session
, uid
) &&
600 !session
->destroyed
) {
603 session_unlock(session
);
604 session_put(session
);
609 static enum lttng_error_code
receive_lttng_trigger(struct command_ctx
*cmd_ctx
,
612 struct lttng_trigger
**_trigger
)
616 ssize_t sock_recv_len
;
617 enum lttng_error_code ret_code
;
618 struct lttng_payload trigger_payload
;
619 struct lttng_trigger
*trigger
= NULL
;
621 lttng_payload_init(&trigger_payload
);
622 trigger_len
= (size_t) cmd_ctx
->lsm
.u
.trigger
.length
;
623 ret
= lttng_dynamic_buffer_set_size(
624 &trigger_payload
.buffer
, trigger_len
);
626 ret_code
= LTTNG_ERR_NOMEM
;
630 sock_recv_len
= lttcomm_recv_unix_sock(
631 sock
, trigger_payload
.buffer
.data
, trigger_len
);
632 if (sock_recv_len
< 0 || sock_recv_len
!= trigger_len
) {
633 ERR("Failed to receive trigger in command payload");
635 ret_code
= LTTNG_ERR_INVALID_PROTOCOL
;
639 /* Receive fds, if any. */
640 if (cmd_ctx
->lsm
.fd_count
> 0) {
641 sock_recv_len
= lttcomm_recv_payload_fds_unix_sock(
642 sock
, cmd_ctx
->lsm
.fd_count
, &trigger_payload
);
643 if (sock_recv_len
> 0 &&
644 sock_recv_len
!= cmd_ctx
->lsm
.fd_count
* sizeof(int)) {
645 ERR("Failed to receive all file descriptors for trigger in command payload: expected fd count = %u, ret = %d",
646 cmd_ctx
->lsm
.fd_count
, (int) ret
);
647 ret_code
= LTTNG_ERR_INVALID_PROTOCOL
;
650 } else if (sock_recv_len
<= 0) {
651 ERR("Failed to receive file descriptors for trigger in command payload: expected fd count = %u, ret = %d",
652 cmd_ctx
->lsm
.fd_count
, (int) ret
);
653 ret_code
= LTTNG_ERR_FATAL
;
659 /* Deserialize trigger. */
661 struct lttng_payload_view view
=
662 lttng_payload_view_from_payload(
663 &trigger_payload
, 0, -1);
665 if (lttng_trigger_create_from_payload(&view
, &trigger
) !=
667 ERR("Invalid trigger received as part of command payload");
668 ret_code
= LTTNG_ERR_INVALID_TRIGGER
;
669 lttng_trigger_put(trigger
);
678 lttng_payload_reset(&trigger_payload
);
682 static enum lttng_error_code
receive_lttng_error_query(struct command_ctx
*cmd_ctx
,
685 struct lttng_error_query
**_query
)
689 ssize_t sock_recv_len
;
690 enum lttng_error_code ret_code
;
691 struct lttng_payload query_payload
;
692 struct lttng_error_query
*query
= NULL
;
694 lttng_payload_init(&query_payload
);
695 query_len
= (size_t) cmd_ctx
->lsm
.u
.error_query
.length
;
696 ret
= lttng_dynamic_buffer_set_size(&query_payload
.buffer
, query_len
);
698 ret_code
= LTTNG_ERR_NOMEM
;
702 sock_recv_len
= lttcomm_recv_unix_sock(
703 sock
, query_payload
.buffer
.data
, query_len
);
704 if (sock_recv_len
< 0 || sock_recv_len
!= query_len
) {
705 ERR("Failed to receive error query in command payload");
707 ret_code
= LTTNG_ERR_INVALID_PROTOCOL
;
711 /* Receive fds, if any. */
712 if (cmd_ctx
->lsm
.fd_count
> 0) {
713 sock_recv_len
= lttcomm_recv_payload_fds_unix_sock(
714 sock
, cmd_ctx
->lsm
.fd_count
, &query_payload
);
715 if (sock_recv_len
> 0 &&
716 sock_recv_len
!= cmd_ctx
->lsm
.fd_count
* sizeof(int)) {
717 ERR("Failed to receive all file descriptors for error query in command payload: expected fd count = %u, ret = %d",
718 cmd_ctx
->lsm
.fd_count
, (int) ret
);
719 ret_code
= LTTNG_ERR_INVALID_PROTOCOL
;
722 } else if (sock_recv_len
<= 0) {
723 ERR("Failed to receive file descriptors for error query in command payload: expected fd count = %u, ret = %d",
724 cmd_ctx
->lsm
.fd_count
, (int) ret
);
725 ret_code
= LTTNG_ERR_FATAL
;
731 /* Deserialize error query. */
733 struct lttng_payload_view view
=
734 lttng_payload_view_from_payload(
735 &query_payload
, 0, -1);
737 if (lttng_error_query_create_from_payload(&view
, &query
) !=
739 ERR("Invalid error query received as part of command payload");
740 ret_code
= LTTNG_ERR_INVALID_PROTOCOL
;
749 lttng_payload_reset(&query_payload
);
753 static enum lttng_error_code
receive_lttng_event(struct command_ctx
*cmd_ctx
,
756 struct lttng_event
**out_event
,
757 char **out_filter_expression
,
758 struct lttng_bytecode
**out_bytecode
,
759 struct lttng_event_exclusion
**out_exclusion
)
763 ssize_t sock_recv_len
;
764 enum lttng_error_code ret_code
;
765 struct lttng_payload event_payload
;
767 lttng_payload_init(&event_payload
);
768 if (cmd_ctx
->lsm
.cmd_type
== LTTNG_ENABLE_EVENT
) {
769 event_len
= (size_t) cmd_ctx
->lsm
.u
.enable
.length
;
770 } else if (cmd_ctx
->lsm
.cmd_type
== LTTNG_DISABLE_EVENT
) {
771 event_len
= (size_t) cmd_ctx
->lsm
.u
.disable
.length
;
776 ret
= lttng_dynamic_buffer_set_size(&event_payload
.buffer
, event_len
);
778 ret_code
= LTTNG_ERR_NOMEM
;
782 sock_recv_len
= lttcomm_recv_unix_sock(
783 sock
, event_payload
.buffer
.data
, event_len
);
784 if (sock_recv_len
< 0 || sock_recv_len
!= event_len
) {
785 ERR("Failed to receive event in command payload");
787 ret_code
= LTTNG_ERR_INVALID_PROTOCOL
;
791 /* Receive fds, if any. */
792 if (cmd_ctx
->lsm
.fd_count
> 0) {
793 sock_recv_len
= lttcomm_recv_payload_fds_unix_sock(
794 sock
, cmd_ctx
->lsm
.fd_count
, &event_payload
);
795 if (sock_recv_len
> 0 &&
796 sock_recv_len
!= cmd_ctx
->lsm
.fd_count
* sizeof(int)) {
797 ERR("Failed to receive all file descriptors for event in command payload: expected fd count = %u, ret = %d",
798 cmd_ctx
->lsm
.fd_count
, (int) ret
);
799 ret_code
= LTTNG_ERR_INVALID_PROTOCOL
;
802 } else if (sock_recv_len
<= 0) {
803 ERR("Failed to receive file descriptors for event in command payload: expected fd count = %u, ret = %d",
804 cmd_ctx
->lsm
.fd_count
, (int) ret
);
805 ret_code
= LTTNG_ERR_FATAL
;
811 /* Deserialize event. */
813 struct lttng_payload_view event_view
=
814 lttng_payload_view_from_payload(
815 &event_payload
, 0, -1);
817 if (lttng_event_create_from_payload(&event_view
, out_event
,
818 out_exclusion
, out_filter_expression
,
819 out_bytecode
) != event_len
) {
820 ERR("Invalid event received as part of command payload");
821 ret_code
= LTTNG_ERR_INVALID_PROTOCOL
;
829 lttng_payload_reset(&event_payload
);
833 static enum lttng_error_code
receive_lttng_event_context(
834 const struct command_ctx
*cmd_ctx
,
837 struct lttng_event_context
**out_event_context
)
840 const size_t event_context_len
=
841 (size_t) cmd_ctx
->lsm
.u
.context
.length
;
842 ssize_t sock_recv_len
;
843 enum lttng_error_code ret_code
;
844 struct lttng_payload event_context_payload
;
846 lttng_payload_init(&event_context_payload
);
848 ret
= lttng_dynamic_buffer_set_size(&event_context_payload
.buffer
,
851 ret_code
= LTTNG_ERR_NOMEM
;
855 sock_recv_len
= lttcomm_recv_unix_sock(
856 sock
, event_context_payload
.buffer
.data
,
858 if (sock_recv_len
< 0 || sock_recv_len
!= event_context_len
) {
859 ERR("Failed to receive event context in command payload");
861 ret_code
= LTTNG_ERR_INVALID_PROTOCOL
;
865 /* Deserialize event. */
867 struct lttng_payload_view event_context_view
=
868 lttng_payload_view_from_payload(
869 &event_context_payload
, 0, -1);
871 if (lttng_event_context_create_from_payload(
872 &event_context_view
, out_event_context
) !=
874 ERR("Invalid event context received as part of command payload");
875 ret_code
= LTTNG_ERR_INVALID_PROTOCOL
;
883 lttng_payload_reset(&event_context_payload
);
888 * Version of setup_lttng_msg() without command header.
890 static int setup_lttng_msg_no_cmd_header(struct command_ctx
*cmd_ctx
,
891 void *payload_buf
, size_t payload_len
)
893 return setup_lttng_msg(cmd_ctx
, payload_buf
, payload_len
, NULL
, 0);
897 * Check if the current kernel tracer supports the session rotation feature.
898 * Return 1 if it does, 0 otherwise.
900 static int check_rotate_compatible(void)
904 if (the_kernel_tracer_version
.major
!= 2 ||
905 the_kernel_tracer_version
.minor
< 11) {
906 DBG("Kernel tracer version is not compatible with the rotation feature");
914 * Send data on a unix socket using the liblttsessiondcomm API.
916 * Return lttcomm error code.
918 static int send_unix_sock(int sock
, struct lttng_payload_view
*view
)
921 const int fd_count
= lttng_payload_view_get_fd_handle_count(view
);
923 /* Check valid length */
924 if (view
->buffer
.size
== 0) {
929 ret
= lttcomm_send_unix_sock(
930 sock
, view
->buffer
.data
, view
->buffer
.size
);
936 ret
= lttcomm_send_payload_view_fds_unix_sock(sock
, view
);
947 * Process the command requested by the lttng client within the command
948 * context structure. This function make sure that the return structure (llm)
949 * is set and ready for transmission before returning.
951 * Return any error encountered or 0 for success.
953 * "sock" is only used for special-case var. len data.
954 * A command may assume the ownership of the socket, in which case its value
955 * should be set to -1.
957 static int process_client_msg(struct command_ctx
*cmd_ctx
, int *sock
,
961 bool need_tracing_session
= true;
965 DBG("Processing client command '%s\' (%d)",
966 lttcomm_sessiond_command_str((lttcomm_sessiond_command
) cmd_ctx
->lsm
.cmd_type
),
967 cmd_ctx
->lsm
.cmd_type
);
971 switch (cmd_ctx
->lsm
.cmd_type
) {
972 case LTTNG_CREATE_SESSION_EXT
:
973 case LTTNG_DESTROY_SESSION
:
974 case LTTNG_LIST_SESSIONS
:
975 case LTTNG_LIST_DOMAINS
:
976 case LTTNG_START_TRACE
:
977 case LTTNG_STOP_TRACE
:
978 case LTTNG_DATA_PENDING
:
979 case LTTNG_SNAPSHOT_ADD_OUTPUT
:
980 case LTTNG_SNAPSHOT_DEL_OUTPUT
:
981 case LTTNG_SNAPSHOT_LIST_OUTPUT
:
982 case LTTNG_SNAPSHOT_RECORD
:
983 case LTTNG_SAVE_SESSION
:
984 case LTTNG_SET_SESSION_SHM_PATH
:
985 case LTTNG_REGENERATE_METADATA
:
986 case LTTNG_REGENERATE_STATEDUMP
:
987 case LTTNG_ROTATE_SESSION
:
988 case LTTNG_ROTATION_GET_INFO
:
989 case LTTNG_ROTATION_SET_SCHEDULE
:
990 case LTTNG_SESSION_LIST_ROTATION_SCHEDULES
:
991 case LTTNG_CLEAR_SESSION
:
992 case LTTNG_LIST_TRIGGERS
:
993 case LTTNG_EXECUTE_ERROR_QUERY
:
1000 /* Needs a functioning consumerd? */
1001 switch (cmd_ctx
->lsm
.cmd_type
) {
1002 case LTTNG_REGISTER_TRIGGER
:
1003 case LTTNG_UNREGISTER_TRIGGER
:
1004 case LTTNG_EXECUTE_ERROR_QUERY
:
1005 need_consumerd
= false;
1008 need_consumerd
= true;
1012 if (the_config
.no_kernel
&& need_domain
&&
1013 cmd_ctx
->lsm
.domain
.type
== LTTNG_DOMAIN_KERNEL
) {
1015 ret
= LTTNG_ERR_NEED_ROOT_SESSIOND
;
1017 ret
= LTTNG_ERR_KERN_NA
;
1022 /* Deny register consumer if we already have a spawned consumer. */
1023 if (cmd_ctx
->lsm
.cmd_type
== LTTNG_REGISTER_CONSUMER
) {
1024 pthread_mutex_lock(&the_kconsumer_data
.pid_mutex
);
1025 if (the_kconsumer_data
.pid
> 0) {
1026 ret
= LTTNG_ERR_KERN_CONSUMER_FAIL
;
1027 pthread_mutex_unlock(&the_kconsumer_data
.pid_mutex
);
1030 pthread_mutex_unlock(&the_kconsumer_data
.pid_mutex
);
1034 * Check for command that don't needs to allocate a returned payload. We do
1035 * this here so we don't have to make the call for no payload at each
1038 switch(cmd_ctx
->lsm
.cmd_type
) {
1039 case LTTNG_LIST_SESSIONS
:
1040 case LTTNG_LIST_TRACEPOINTS
:
1041 case LTTNG_LIST_TRACEPOINT_FIELDS
:
1042 case LTTNG_LIST_DOMAINS
:
1043 case LTTNG_LIST_CHANNELS
:
1044 case LTTNG_LIST_EVENTS
:
1045 case LTTNG_LIST_SYSCALLS
:
1046 case LTTNG_SESSION_LIST_ROTATION_SCHEDULES
:
1047 case LTTNG_PROCESS_ATTR_TRACKER_GET_POLICY
:
1048 case LTTNG_PROCESS_ATTR_TRACKER_GET_INCLUSION_SET
:
1049 case LTTNG_DATA_PENDING
:
1050 case LTTNG_ROTATE_SESSION
:
1051 case LTTNG_ROTATION_GET_INFO
:
1052 case LTTNG_REGISTER_TRIGGER
:
1053 case LTTNG_LIST_TRIGGERS
:
1054 case LTTNG_EXECUTE_ERROR_QUERY
:
1057 /* Setup lttng message with no payload */
1058 ret
= setup_lttng_msg_no_cmd_header(cmd_ctx
, NULL
, 0);
1060 /* This label does not try to unlock the session */
1061 goto init_setup_error
;
1065 /* Commands that DO NOT need a session. */
1066 switch (cmd_ctx
->lsm
.cmd_type
) {
1067 case LTTNG_CREATE_SESSION_EXT
:
1068 case LTTNG_LIST_SESSIONS
:
1069 case LTTNG_LIST_TRACEPOINTS
:
1070 case LTTNG_LIST_SYSCALLS
:
1071 case LTTNG_LIST_TRACEPOINT_FIELDS
:
1072 case LTTNG_SAVE_SESSION
:
1073 case LTTNG_REGISTER_TRIGGER
:
1074 case LTTNG_UNREGISTER_TRIGGER
:
1075 case LTTNG_LIST_TRIGGERS
:
1076 case LTTNG_EXECUTE_ERROR_QUERY
:
1077 need_tracing_session
= false;
1080 DBG("Getting session %s by name", cmd_ctx
->lsm
.session
.name
);
1082 * We keep the session list lock across _all_ commands
1083 * for now, because the per-session lock does not
1084 * handle teardown properly.
1086 session_lock_list();
1087 cmd_ctx
->session
= session_find_by_name(cmd_ctx
->lsm
.session
.name
);
1088 if (cmd_ctx
->session
== NULL
) {
1089 ret
= LTTNG_ERR_SESS_NOT_FOUND
;
1092 /* Acquire lock for the session */
1093 session_lock(cmd_ctx
->session
);
1099 * Commands that need a valid session but should NOT create one if none
1100 * exists. Instead of creating one and destroying it when the command is
1101 * handled, process that right before so we save some round trip in useless
1104 switch (cmd_ctx
->lsm
.cmd_type
) {
1105 case LTTNG_DISABLE_CHANNEL
:
1106 case LTTNG_DISABLE_EVENT
:
1107 switch (cmd_ctx
->lsm
.domain
.type
) {
1108 case LTTNG_DOMAIN_KERNEL
:
1109 if (!cmd_ctx
->session
->kernel_session
) {
1110 ret
= LTTNG_ERR_NO_CHANNEL
;
1114 case LTTNG_DOMAIN_JUL
:
1115 case LTTNG_DOMAIN_LOG4J
:
1116 case LTTNG_DOMAIN_PYTHON
:
1117 case LTTNG_DOMAIN_UST
:
1118 if (!cmd_ctx
->session
->ust_session
) {
1119 ret
= LTTNG_ERR_NO_CHANNEL
;
1124 ret
= LTTNG_ERR_UNKNOWN_DOMAIN
;
1136 * Check domain type for specific "pre-action".
1138 switch (cmd_ctx
->lsm
.domain
.type
) {
1139 case LTTNG_DOMAIN_KERNEL
:
1141 ret
= LTTNG_ERR_NEED_ROOT_SESSIOND
;
1145 /* Kernel tracer check */
1146 if (!kernel_tracer_is_initialized()) {
1147 /* Basically, load kernel tracer modules */
1148 ret
= init_kernel_tracer();
1154 /* Consumer is in an ERROR state. Report back to client */
1155 if (need_consumerd
&& uatomic_read(&the_kernel_consumerd_state
) ==
1157 ret
= LTTNG_ERR_NO_KERNCONSUMERD
;
1161 /* Need a session for kernel command */
1162 if (need_tracing_session
) {
1163 if (cmd_ctx
->session
->kernel_session
== NULL
) {
1164 ret
= create_kernel_session(cmd_ctx
->session
);
1165 if (ret
!= LTTNG_OK
) {
1166 ret
= LTTNG_ERR_KERN_SESS_FAIL
;
1171 /* Start the kernel consumer daemon */
1172 pthread_mutex_lock(&the_kconsumer_data
.pid_mutex
);
1173 if (the_kconsumer_data
.pid
== 0 &&
1174 cmd_ctx
->lsm
.cmd_type
!= LTTNG_REGISTER_CONSUMER
) {
1175 pthread_mutex_unlock(&the_kconsumer_data
.pid_mutex
);
1176 ret
= start_consumerd(&the_kconsumer_data
);
1178 ret
= LTTNG_ERR_KERN_CONSUMER_FAIL
;
1181 uatomic_set(&the_kernel_consumerd_state
, CONSUMER_STARTED
);
1183 pthread_mutex_unlock(&the_kconsumer_data
.pid_mutex
);
1187 * The consumer was just spawned so we need to add the socket to
1188 * the consumer output of the session if exist.
1190 ret
= consumer_create_socket(&the_kconsumer_data
,
1191 cmd_ctx
->session
->kernel_session
->consumer
);
1198 case LTTNG_DOMAIN_JUL
:
1199 case LTTNG_DOMAIN_LOG4J
:
1200 case LTTNG_DOMAIN_PYTHON
:
1201 if (!agent_tracing_is_enabled()) {
1202 ret
= LTTNG_ERR_AGENT_TRACING_DISABLED
;
1206 case LTTNG_DOMAIN_UST
:
1208 if (!ust_app_supported()) {
1209 ret
= LTTNG_ERR_NO_UST
;
1213 /* Consumer is in an ERROR state. Report back to client */
1214 if (need_consumerd
&&
1215 uatomic_read(&the_ust_consumerd_state
) ==
1217 ret
= LTTNG_ERR_NO_USTCONSUMERD
;
1221 if (need_tracing_session
) {
1222 /* Create UST session if none exist. */
1223 if (cmd_ctx
->session
->ust_session
== NULL
) {
1224 lttng_domain domain
= cmd_ctx
->lsm
.domain
;
1225 ret
= create_ust_session(cmd_ctx
->session
, &domain
);
1226 if (ret
!= LTTNG_OK
) {
1231 /* Start the UST consumer daemons */
1233 pthread_mutex_lock(&the_ustconsumer64_data
.pid_mutex
);
1234 if (the_config
.consumerd64_bin_path
.value
&&
1235 the_ustconsumer64_data
.pid
== 0 &&
1236 cmd_ctx
->lsm
.cmd_type
!= LTTNG_REGISTER_CONSUMER
) {
1237 pthread_mutex_unlock(&the_ustconsumer64_data
.pid_mutex
);
1238 ret
= start_consumerd(&the_ustconsumer64_data
);
1240 ret
= LTTNG_ERR_UST_CONSUMER64_FAIL
;
1241 uatomic_set(&the_ust_consumerd64_fd
, -EINVAL
);
1245 uatomic_set(&the_ust_consumerd64_fd
, the_ustconsumer64_data
.cmd_sock
);
1246 uatomic_set(&the_ust_consumerd_state
, CONSUMER_STARTED
);
1248 pthread_mutex_unlock(&the_ustconsumer64_data
.pid_mutex
);
1252 * Setup socket for consumer 64 bit. No need for atomic access
1253 * since it was set above and can ONLY be set in this thread.
1255 ret
= consumer_create_socket(&the_ustconsumer64_data
,
1256 cmd_ctx
->session
->ust_session
->consumer
);
1262 pthread_mutex_lock(&the_ustconsumer32_data
.pid_mutex
);
1263 if (the_config
.consumerd32_bin_path
.value
&&
1264 the_ustconsumer32_data
.pid
== 0 &&
1265 cmd_ctx
->lsm
.cmd_type
!= LTTNG_REGISTER_CONSUMER
) {
1266 pthread_mutex_unlock(&the_ustconsumer32_data
.pid_mutex
);
1267 ret
= start_consumerd(&the_ustconsumer32_data
);
1269 ret
= LTTNG_ERR_UST_CONSUMER32_FAIL
;
1270 uatomic_set(&the_ust_consumerd32_fd
, -EINVAL
);
1274 uatomic_set(&the_ust_consumerd32_fd
, the_ustconsumer32_data
.cmd_sock
);
1275 uatomic_set(&the_ust_consumerd_state
, CONSUMER_STARTED
);
1277 pthread_mutex_unlock(&the_ustconsumer32_data
.pid_mutex
);
1281 * Setup socket for consumer 32 bit. No need for atomic access
1282 * since it was set above and can ONLY be set in this thread.
1284 ret
= consumer_create_socket(&the_ustconsumer32_data
,
1285 cmd_ctx
->session
->ust_session
->consumer
);
1297 /* Validate consumer daemon state when start/stop trace command */
1298 if (cmd_ctx
->lsm
.cmd_type
== LTTNG_START_TRACE
||
1299 cmd_ctx
->lsm
.cmd_type
== LTTNG_STOP_TRACE
) {
1300 switch (cmd_ctx
->lsm
.domain
.type
) {
1301 case LTTNG_DOMAIN_NONE
:
1303 case LTTNG_DOMAIN_JUL
:
1304 case LTTNG_DOMAIN_LOG4J
:
1305 case LTTNG_DOMAIN_PYTHON
:
1306 case LTTNG_DOMAIN_UST
:
1307 if (uatomic_read(&the_ust_consumerd_state
) != CONSUMER_STARTED
) {
1308 ret
= LTTNG_ERR_NO_USTCONSUMERD
;
1312 case LTTNG_DOMAIN_KERNEL
:
1313 if (uatomic_read(&the_kernel_consumerd_state
) != CONSUMER_STARTED
) {
1314 ret
= LTTNG_ERR_NO_KERNCONSUMERD
;
1319 ret
= LTTNG_ERR_UNKNOWN_DOMAIN
;
1325 * Check that the UID matches that of the tracing session.
1326 * The root user can interact with all sessions.
1328 if (need_tracing_session
) {
1329 if (!session_access_ok(cmd_ctx
->session
,
1330 LTTNG_SOCK_GET_UID_CRED(&cmd_ctx
->creds
)) ||
1331 cmd_ctx
->session
->destroyed
) {
1332 ret
= LTTNG_ERR_EPERM
;
1338 * Send relayd information to consumer as soon as we have a domain and a
1341 if (cmd_ctx
->session
&& need_domain
) {
1343 * Setup relayd if not done yet. If the relayd information was already
1344 * sent to the consumer, this call will gracefully return.
1346 ret
= cmd_setup_relayd(cmd_ctx
->session
);
1347 if (ret
!= LTTNG_OK
) {
1352 /* Process by command type */
1353 switch (cmd_ctx
->lsm
.cmd_type
) {
1354 case LTTNG_ADD_CONTEXT
:
1356 struct lttng_event_context
*event_context
;
1357 const enum lttng_error_code ret_code
=
1358 receive_lttng_event_context(
1359 cmd_ctx
, *sock
, sock_error
, &event_context
);
1361 if (ret_code
!= LTTNG_OK
) {
1362 ret
= (int) ret_code
;
1366 ret
= cmd_add_context(cmd_ctx
, event_context
, the_kernel_poll_pipe
[1]);
1367 lttng_event_context_destroy(event_context
);
1370 case LTTNG_DISABLE_CHANNEL
:
1372 ret
= cmd_disable_channel(cmd_ctx
->session
, cmd_ctx
->lsm
.domain
.type
,
1373 cmd_ctx
->lsm
.u
.disable
.channel_name
);
1376 case LTTNG_ENABLE_CHANNEL
:
1378 ret
= cmd_enable_channel(
1379 cmd_ctx
, *sock
, the_kernel_poll_pipe
[1]);
1382 case LTTNG_PROCESS_ATTR_TRACKER_ADD_INCLUDE_VALUE
:
1383 case LTTNG_PROCESS_ATTR_TRACKER_REMOVE_INCLUDE_VALUE
:
1385 struct lttng_dynamic_buffer payload
;
1386 struct lttng_buffer_view payload_view
;
1387 const bool add_value
=
1388 cmd_ctx
->lsm
.cmd_type
==
1389 LTTNG_PROCESS_ATTR_TRACKER_ADD_INCLUDE_VALUE
;
1390 const size_t name_len
=
1391 cmd_ctx
->lsm
.u
.process_attr_tracker_add_remove_include_value
1393 const enum lttng_domain_type domain_type
=
1394 (enum lttng_domain_type
)
1395 cmd_ctx
->lsm
.domain
.type
;
1396 const enum lttng_process_attr process_attr
=
1397 (enum lttng_process_attr
) cmd_ctx
->lsm
.u
1398 .process_attr_tracker_add_remove_include_value
1400 const enum lttng_process_attr_value_type value_type
=
1401 (enum lttng_process_attr_value_type
) cmd_ctx
1403 .process_attr_tracker_add_remove_include_value
1405 struct process_attr_value
*value
;
1406 enum lttng_error_code ret_code
;
1407 long login_name_max
;
1409 login_name_max
= sysconf(_SC_LOGIN_NAME_MAX
);
1410 if (login_name_max
< 0) {
1411 PERROR("Failed to get _SC_LOGIN_NAME_MAX system configuration");
1412 ret
= LTTNG_ERR_INVALID
;
1416 /* Receive remaining variable length payload if applicable. */
1417 if (name_len
> login_name_max
) {
1419 * POSIX mandates user and group names that are at least
1420 * 8 characters long. Note that although shadow-utils
1421 * (useradd, groupaadd, etc.) use 32 chars as their
1422 * limit (from bits/utmp.h, UT_NAMESIZE),
1423 * LOGIN_NAME_MAX is defined to 256.
1425 ERR("Rejecting process attribute tracker value %s as the provided exceeds the maximal allowed length: argument length = %zu, maximal length = %ld",
1426 add_value
? "addition" : "removal",
1427 name_len
, login_name_max
);
1428 ret
= LTTNG_ERR_INVALID
;
1432 lttng_dynamic_buffer_init(&payload
);
1433 if (name_len
!= 0) {
1435 * Receive variable payload for user/group name
1438 ret
= lttng_dynamic_buffer_set_size(&payload
, name_len
);
1440 ERR("Failed to allocate buffer to receive payload of %s process attribute tracker value argument",
1441 add_value
? "add" : "remove");
1442 ret
= LTTNG_ERR_NOMEM
;
1443 goto error_add_remove_tracker_value
;
1446 ret
= lttcomm_recv_unix_sock(
1447 *sock
, payload
.data
, name_len
);
1449 ERR("Failed to receive payload of %s process attribute tracker value argument",
1450 add_value
? "add" : "remove");
1452 ret
= LTTNG_ERR_INVALID_PROTOCOL
;
1453 goto error_add_remove_tracker_value
;
1457 payload_view
= lttng_buffer_view_from_dynamic_buffer(
1458 &payload
, 0, name_len
);
1459 if (name_len
> 0 && !lttng_buffer_view_is_valid(&payload_view
)) {
1460 ret
= LTTNG_ERR_INVALID_PROTOCOL
;
1461 goto error_add_remove_tracker_value
;
1465 * Validate the value type and domains are legal for the process
1466 * attribute tracker that is specified and convert the value to
1467 * add/remove to the internal sessiond representation.
1469 ret_code
= process_attr_value_from_comm(domain_type
,
1470 process_attr
, value_type
,
1471 &cmd_ctx
->lsm
.u
.process_attr_tracker_add_remove_include_value
1473 &payload_view
, &value
);
1474 if (ret_code
!= LTTNG_OK
) {
1476 goto error_add_remove_tracker_value
;
1480 ret
= cmd_process_attr_tracker_inclusion_set_add_value(
1481 cmd_ctx
->session
, domain_type
,
1482 process_attr
, value
);
1484 ret
= cmd_process_attr_tracker_inclusion_set_remove_value(
1485 cmd_ctx
->session
, domain_type
,
1486 process_attr
, value
);
1488 process_attr_value_destroy(value
);
1489 error_add_remove_tracker_value
:
1490 lttng_dynamic_buffer_reset(&payload
);
1493 case LTTNG_PROCESS_ATTR_TRACKER_GET_POLICY
:
1495 enum lttng_tracking_policy tracking_policy
;
1496 const enum lttng_domain_type domain_type
=
1497 (enum lttng_domain_type
)
1498 cmd_ctx
->lsm
.domain
.type
;
1499 const enum lttng_process_attr process_attr
=
1500 (enum lttng_process_attr
) cmd_ctx
->lsm
.u
1501 .process_attr_tracker_get_tracking_policy
1504 ret
= cmd_process_attr_tracker_get_tracking_policy(
1505 cmd_ctx
->session
, domain_type
, process_attr
,
1507 if (ret
!= LTTNG_OK
) {
1511 uint32_t tracking_policy_u32
= tracking_policy
;
1512 ret
= setup_lttng_msg_no_cmd_header(cmd_ctx
,
1513 &tracking_policy_u32
, sizeof(uint32_t));
1515 ret
= LTTNG_ERR_NOMEM
;
1521 case LTTNG_PROCESS_ATTR_TRACKER_SET_POLICY
:
1523 const enum lttng_tracking_policy tracking_policy
=
1524 (enum lttng_tracking_policy
) cmd_ctx
->lsm
.u
1525 .process_attr_tracker_set_tracking_policy
1527 const enum lttng_domain_type domain_type
=
1528 (enum lttng_domain_type
)
1529 cmd_ctx
->lsm
.domain
.type
;
1530 const enum lttng_process_attr process_attr
=
1531 (enum lttng_process_attr
) cmd_ctx
->lsm
.u
1532 .process_attr_tracker_set_tracking_policy
1535 ret
= cmd_process_attr_tracker_set_tracking_policy(
1536 cmd_ctx
->session
, domain_type
, process_attr
,
1538 if (ret
!= LTTNG_OK
) {
1543 case LTTNG_PROCESS_ATTR_TRACKER_GET_INCLUSION_SET
:
1545 struct lttng_process_attr_values
*values
;
1546 struct lttng_dynamic_buffer reply
;
1547 const enum lttng_domain_type domain_type
=
1548 (enum lttng_domain_type
)
1549 cmd_ctx
->lsm
.domain
.type
;
1550 const enum lttng_process_attr process_attr
=
1551 (enum lttng_process_attr
) cmd_ctx
->lsm
.u
1552 .process_attr_tracker_get_inclusion_set
1555 ret
= cmd_process_attr_tracker_get_inclusion_set(
1556 cmd_ctx
->session
, domain_type
, process_attr
,
1558 if (ret
!= LTTNG_OK
) {
1562 lttng_dynamic_buffer_init(&reply
);
1563 ret
= lttng_process_attr_values_serialize(values
, &reply
);
1565 goto error_tracker_get_inclusion_set
;
1568 ret
= setup_lttng_msg_no_cmd_header(
1569 cmd_ctx
, reply
.data
, reply
.size
);
1571 ret
= LTTNG_ERR_NOMEM
;
1572 goto error_tracker_get_inclusion_set
;
1576 error_tracker_get_inclusion_set
:
1577 lttng_process_attr_values_destroy(values
);
1578 lttng_dynamic_buffer_reset(&reply
);
1581 case LTTNG_ENABLE_EVENT
:
1582 case LTTNG_DISABLE_EVENT
:
1584 struct lttng_event
*event
;
1585 char *filter_expression
;
1586 struct lttng_event_exclusion
*exclusions
;
1587 struct lttng_bytecode
*bytecode
;
1588 const enum lttng_error_code ret_code
= receive_lttng_event(
1589 cmd_ctx
, *sock
, sock_error
, &event
,
1590 &filter_expression
, &bytecode
, &exclusions
);
1592 if (ret_code
!= LTTNG_OK
) {
1593 ret
= (int) ret_code
;
1598 * Ownership of filter_expression, exclusions, and bytecode is
1599 * always transferred.
1601 ret
= cmd_ctx
->lsm
.cmd_type
== LTTNG_ENABLE_EVENT
?
1602 cmd_enable_event(cmd_ctx
, event
,
1603 filter_expression
, exclusions
,
1605 the_kernel_poll_pipe
[1]) :
1606 cmd_disable_event(cmd_ctx
, event
,
1607 filter_expression
, bytecode
,
1609 lttng_event_destroy(event
);
1612 case LTTNG_LIST_TRACEPOINTS
:
1614 enum lttng_error_code ret_code
;
1615 size_t original_payload_size
;
1616 size_t payload_size
;
1617 const size_t command_header_size
= sizeof(struct lttcomm_list_command_header
);
1619 ret
= setup_empty_lttng_msg(cmd_ctx
);
1621 ret
= LTTNG_ERR_NOMEM
;
1625 original_payload_size
= cmd_ctx
->reply_payload
.buffer
.size
;
1627 session_lock_list();
1628 ret_code
= cmd_list_tracepoints(cmd_ctx
->lsm
.domain
.type
,
1629 &cmd_ctx
->reply_payload
);
1630 session_unlock_list();
1631 if (ret_code
!= LTTNG_OK
) {
1632 ret
= (int) ret_code
;
1636 payload_size
= cmd_ctx
->reply_payload
.buffer
.size
-
1637 command_header_size
- original_payload_size
;
1638 update_lttng_msg(cmd_ctx
, command_header_size
, payload_size
);
1643 case LTTNG_LIST_TRACEPOINT_FIELDS
:
1645 enum lttng_error_code ret_code
;
1646 size_t original_payload_size
;
1647 size_t payload_size
;
1648 const size_t command_header_size
= sizeof(struct lttcomm_list_command_header
);
1650 ret
= setup_empty_lttng_msg(cmd_ctx
);
1652 ret
= LTTNG_ERR_NOMEM
;
1656 original_payload_size
= cmd_ctx
->reply_payload
.buffer
.size
;
1658 session_lock_list();
1659 ret_code
= cmd_list_tracepoint_fields(
1660 cmd_ctx
->lsm
.domain
.type
, &cmd_ctx
->reply_payload
);
1661 session_unlock_list();
1662 if (ret_code
!= LTTNG_OK
) {
1663 ret
= (int) ret_code
;
1667 payload_size
= cmd_ctx
->reply_payload
.buffer
.size
-
1668 command_header_size
- original_payload_size
;
1669 update_lttng_msg(cmd_ctx
, command_header_size
, payload_size
);
1674 case LTTNG_LIST_SYSCALLS
:
1676 enum lttng_error_code ret_code
;
1677 size_t original_payload_size
;
1678 size_t payload_size
;
1679 const size_t command_header_size
= sizeof(struct lttcomm_list_command_header
);
1681 ret
= setup_empty_lttng_msg(cmd_ctx
);
1683 ret
= LTTNG_ERR_NOMEM
;
1687 original_payload_size
= cmd_ctx
->reply_payload
.buffer
.size
;
1689 ret_code
= cmd_list_syscalls(&cmd_ctx
->reply_payload
);
1690 if (ret_code
!= LTTNG_OK
) {
1691 ret
= (int) ret_code
;
1695 payload_size
= cmd_ctx
->reply_payload
.buffer
.size
-
1696 command_header_size
- original_payload_size
;
1697 update_lttng_msg(cmd_ctx
, command_header_size
, payload_size
);
1702 case LTTNG_SET_CONSUMER_URI
:
1705 struct lttng_uri
*uris
;
1707 nb_uri
= cmd_ctx
->lsm
.u
.uri
.size
;
1708 len
= nb_uri
* sizeof(struct lttng_uri
);
1711 ret
= LTTNG_ERR_INVALID
;
1715 uris
= (lttng_uri
*) zmalloc(len
);
1717 ret
= LTTNG_ERR_FATAL
;
1721 /* Receive variable len data */
1722 DBG("Receiving %zu URI(s) from client ...", nb_uri
);
1723 ret
= lttcomm_recv_unix_sock(*sock
, uris
, len
);
1725 DBG("No URIs received from client... continuing");
1727 ret
= LTTNG_ERR_SESSION_FAIL
;
1732 ret
= cmd_set_consumer_uri(cmd_ctx
->session
, nb_uri
, uris
);
1734 if (ret
!= LTTNG_OK
) {
1741 case LTTNG_START_TRACE
:
1744 * On the first start, if we have a kernel session and we have
1745 * enabled time or size-based rotations, we have to make sure
1746 * the kernel tracer supports it.
1748 if (!cmd_ctx
->session
->has_been_started
&& \
1749 cmd_ctx
->session
->kernel_session
&& \
1750 (cmd_ctx
->session
->rotate_timer_period
|| \
1751 cmd_ctx
->session
->rotate_size
) && \
1752 !check_rotate_compatible()) {
1753 DBG("Kernel tracer version is not compatible with the rotation feature");
1754 ret
= LTTNG_ERR_ROTATION_WRONG_VERSION
;
1757 ret
= cmd_start_trace(cmd_ctx
->session
);
1760 case LTTNG_STOP_TRACE
:
1762 ret
= cmd_stop_trace(cmd_ctx
->session
);
1765 case LTTNG_DESTROY_SESSION
:
1767 ret
= cmd_destroy_session(cmd_ctx
->session
,
1768 the_notification_thread_handle
, sock
);
1771 case LTTNG_LIST_DOMAINS
:
1774 struct lttng_domain
*domains
= NULL
;
1776 nb_dom
= cmd_list_domains(cmd_ctx
->session
, &domains
);
1778 /* Return value is a negative lttng_error_code. */
1783 ret
= setup_lttng_msg_no_cmd_header(cmd_ctx
, domains
,
1784 nb_dom
* sizeof(struct lttng_domain
));
1794 case LTTNG_LIST_CHANNELS
:
1796 enum lttng_error_code ret_code
;
1797 size_t original_payload_size
;
1798 size_t payload_size
;
1799 const size_t command_header_size
= sizeof(struct lttcomm_list_command_header
);
1801 ret
= setup_empty_lttng_msg(cmd_ctx
);
1803 ret
= LTTNG_ERR_NOMEM
;
1807 original_payload_size
= cmd_ctx
->reply_payload
.buffer
.size
;
1809 ret_code
= cmd_list_channels(cmd_ctx
->lsm
.domain
.type
,
1810 cmd_ctx
->session
, &cmd_ctx
->reply_payload
);
1811 if (ret_code
!= LTTNG_OK
) {
1812 ret
= (int) ret_code
;
1816 payload_size
= cmd_ctx
->reply_payload
.buffer
.size
-
1817 command_header_size
- original_payload_size
;
1818 update_lttng_msg(cmd_ctx
, command_header_size
, payload_size
);
1823 case LTTNG_LIST_EVENTS
:
1825 enum lttng_error_code ret_code
;
1826 size_t original_payload_size
;
1827 size_t payload_size
;
1828 const size_t command_header_size
= sizeof(struct lttcomm_list_command_header
);
1830 ret
= setup_empty_lttng_msg(cmd_ctx
);
1832 ret
= LTTNG_ERR_NOMEM
;
1836 original_payload_size
= cmd_ctx
->reply_payload
.buffer
.size
;
1838 ret_code
= cmd_list_events(cmd_ctx
->lsm
.domain
.type
,
1840 cmd_ctx
->lsm
.u
.list
.channel_name
, &cmd_ctx
->reply_payload
);
1841 if (ret_code
!= LTTNG_OK
) {
1842 ret
= (int) ret_code
;
1846 payload_size
= cmd_ctx
->reply_payload
.buffer
.size
-
1847 command_header_size
- original_payload_size
;
1848 update_lttng_msg(cmd_ctx
, command_header_size
, payload_size
);
1853 case LTTNG_LIST_SESSIONS
:
1855 unsigned int nr_sessions
;
1856 lttng_session
*sessions_payload
;
1859 session_lock_list();
1860 nr_sessions
= lttng_sessions_count(
1861 LTTNG_SOCK_GET_UID_CRED(&cmd_ctx
->creds
),
1862 LTTNG_SOCK_GET_GID_CRED(&cmd_ctx
->creds
));
1864 payload_len
= (sizeof(struct lttng_session
) * nr_sessions
) +
1865 (sizeof(struct lttng_session_extended
) * nr_sessions
);
1866 sessions_payload
= (lttng_session
*) zmalloc(payload_len
);
1868 if (!sessions_payload
) {
1869 session_unlock_list();
1874 cmd_list_lttng_sessions(sessions_payload
, nr_sessions
,
1875 LTTNG_SOCK_GET_UID_CRED(&cmd_ctx
->creds
),
1876 LTTNG_SOCK_GET_GID_CRED(&cmd_ctx
->creds
));
1877 session_unlock_list();
1879 ret
= setup_lttng_msg_no_cmd_header(cmd_ctx
, sessions_payload
,
1881 free(sessions_payload
);
1890 case LTTNG_REGISTER_CONSUMER
:
1892 struct consumer_data
*cdata
;
1894 switch (cmd_ctx
->lsm
.domain
.type
) {
1895 case LTTNG_DOMAIN_KERNEL
:
1896 cdata
= &the_kconsumer_data
;
1899 ret
= LTTNG_ERR_UND
;
1903 ret
= cmd_register_consumer(cmd_ctx
->session
, cmd_ctx
->lsm
.domain
.type
,
1904 cmd_ctx
->lsm
.u
.reg
.path
, cdata
);
1907 case LTTNG_DATA_PENDING
:
1910 uint8_t pending_ret_byte
;
1912 pending_ret
= cmd_data_pending(cmd_ctx
->session
);
1917 * This function may returns 0 or 1 to indicate whether or not
1918 * there is data pending. In case of error, it should return an
1919 * LTTNG_ERR code. However, some code paths may still return
1920 * a nondescript error code, which we handle by returning an
1923 if (pending_ret
== 0 || pending_ret
== 1) {
1925 * ret will be set to LTTNG_OK at the end of
1928 } else if (pending_ret
< 0) {
1929 ret
= LTTNG_ERR_UNK
;
1936 pending_ret_byte
= (uint8_t) pending_ret
;
1938 /* 1 byte to return whether or not data is pending */
1939 ret
= setup_lttng_msg_no_cmd_header(cmd_ctx
,
1940 &pending_ret_byte
, 1);
1949 case LTTNG_SNAPSHOT_ADD_OUTPUT
:
1951 uint32_t snapshot_id
;
1952 struct lttcomm_lttng_output_id reply
;
1953 lttng_snapshot_output output
= cmd_ctx
->lsm
.u
.snapshot_output
.output
;
1955 ret
= cmd_snapshot_add_output(cmd_ctx
->session
,
1958 if (ret
!= LTTNG_OK
) {
1961 reply
.id
= snapshot_id
;
1963 ret
= setup_lttng_msg_no_cmd_header(cmd_ctx
, &reply
,
1969 /* Copy output list into message payload */
1973 case LTTNG_SNAPSHOT_DEL_OUTPUT
:
1975 lttng_snapshot_output output
= cmd_ctx
->lsm
.u
.snapshot_output
.output
;
1976 ret
= cmd_snapshot_del_output(cmd_ctx
->session
, &output
);
1979 case LTTNG_SNAPSHOT_LIST_OUTPUT
:
1982 struct lttng_snapshot_output
*outputs
= NULL
;
1984 nb_output
= cmd_snapshot_list_outputs(cmd_ctx
->session
, &outputs
);
1985 if (nb_output
< 0) {
1990 LTTNG_ASSERT((nb_output
> 0 && outputs
) || nb_output
== 0);
1991 ret
= setup_lttng_msg_no_cmd_header(cmd_ctx
, outputs
,
1992 nb_output
* sizeof(struct lttng_snapshot_output
));
2002 case LTTNG_SNAPSHOT_RECORD
:
2004 lttng_snapshot_output output
= cmd_ctx
->lsm
.u
.snapshot_record
.output
;
2005 ret
= cmd_snapshot_record(cmd_ctx
->session
,
2007 cmd_ctx
->lsm
.u
.snapshot_record
.wait
);
2010 case LTTNG_CREATE_SESSION_EXT
:
2012 struct lttng_dynamic_buffer payload
;
2013 struct lttng_session_descriptor
*return_descriptor
= NULL
;
2015 lttng_dynamic_buffer_init(&payload
);
2016 ret
= cmd_create_session(cmd_ctx
, *sock
, &return_descriptor
);
2017 if (ret
!= LTTNG_OK
) {
2021 ret
= lttng_session_descriptor_serialize(return_descriptor
,
2024 ERR("Failed to serialize session descriptor in reply to \"create session\" command");
2025 lttng_session_descriptor_destroy(return_descriptor
);
2026 ret
= LTTNG_ERR_NOMEM
;
2029 ret
= setup_lttng_msg_no_cmd_header(cmd_ctx
, payload
.data
,
2032 lttng_session_descriptor_destroy(return_descriptor
);
2033 ret
= LTTNG_ERR_NOMEM
;
2036 lttng_dynamic_buffer_reset(&payload
);
2037 lttng_session_descriptor_destroy(return_descriptor
);
2041 case LTTNG_SAVE_SESSION
:
2043 ret
= cmd_save_sessions(&cmd_ctx
->lsm
.u
.save_session
.attr
,
2047 case LTTNG_SET_SESSION_SHM_PATH
:
2049 ret
= cmd_set_session_shm_path(cmd_ctx
->session
,
2050 cmd_ctx
->lsm
.u
.set_shm_path
.shm_path
);
2053 case LTTNG_REGENERATE_METADATA
:
2055 ret
= cmd_regenerate_metadata(cmd_ctx
->session
);
2058 case LTTNG_REGENERATE_STATEDUMP
:
2060 ret
= cmd_regenerate_statedump(cmd_ctx
->session
);
2063 case LTTNG_REGISTER_TRIGGER
:
2065 struct lttng_trigger
*payload_trigger
;
2066 struct lttng_trigger
*return_trigger
;
2067 size_t original_reply_payload_size
;
2068 size_t reply_payload_size
;
2069 const struct lttng_credentials cmd_creds
= {
2070 .uid
= LTTNG_OPTIONAL_INIT_VALUE(cmd_ctx
->creds
.uid
),
2071 .gid
= LTTNG_OPTIONAL_INIT_VALUE(cmd_ctx
->creds
.gid
),
2074 ret
= setup_empty_lttng_msg(cmd_ctx
);
2076 ret
= LTTNG_ERR_NOMEM
;
2080 ret
= receive_lttng_trigger(
2081 cmd_ctx
, *sock
, sock_error
, &payload_trigger
);
2082 if (ret
!= LTTNG_OK
) {
2086 original_reply_payload_size
= cmd_ctx
->reply_payload
.buffer
.size
;
2088 ret
= cmd_register_trigger(&cmd_creds
, payload_trigger
,
2089 cmd_ctx
->lsm
.u
.trigger
.is_trigger_anonymous
,
2090 the_notification_thread_handle
,
2092 if (ret
!= LTTNG_OK
) {
2093 lttng_trigger_put(payload_trigger
);
2097 ret
= lttng_trigger_serialize(return_trigger
, &cmd_ctx
->reply_payload
);
2098 lttng_trigger_put(payload_trigger
);
2099 lttng_trigger_put(return_trigger
);
2101 ERR("Failed to serialize trigger in reply to \"register trigger\" command");
2102 ret
= LTTNG_ERR_NOMEM
;
2106 reply_payload_size
= cmd_ctx
->reply_payload
.buffer
.size
-
2107 original_reply_payload_size
;
2109 update_lttng_msg(cmd_ctx
, 0, reply_payload_size
);
2114 case LTTNG_UNREGISTER_TRIGGER
:
2116 struct lttng_trigger
*payload_trigger
;
2117 const struct lttng_credentials cmd_creds
= {
2118 .uid
= LTTNG_OPTIONAL_INIT_VALUE(cmd_ctx
->creds
.uid
),
2119 .gid
= LTTNG_OPTIONAL_INIT_VALUE(cmd_ctx
->creds
.gid
),
2122 ret
= receive_lttng_trigger(
2123 cmd_ctx
, *sock
, sock_error
, &payload_trigger
);
2124 if (ret
!= LTTNG_OK
) {
2128 ret
= cmd_unregister_trigger(&cmd_creds
, payload_trigger
,
2129 the_notification_thread_handle
);
2130 lttng_trigger_put(payload_trigger
);
2133 case LTTNG_ROTATE_SESSION
:
2135 struct lttng_rotate_session_return rotate_return
;
2137 DBG("Client rotate session \"%s\"", cmd_ctx
->session
->name
);
2139 memset(&rotate_return
, 0, sizeof(rotate_return
));
2140 if (cmd_ctx
->session
->kernel_session
&& !check_rotate_compatible()) {
2141 DBG("Kernel tracer version is not compatible with the rotation feature");
2142 ret
= LTTNG_ERR_ROTATION_WRONG_VERSION
;
2146 ret
= cmd_rotate_session(cmd_ctx
->session
, &rotate_return
,
2148 LTTNG_TRACE_CHUNK_COMMAND_TYPE_MOVE_TO_COMPLETED
);
2154 ret
= setup_lttng_msg_no_cmd_header(cmd_ctx
, &rotate_return
,
2155 sizeof(rotate_return
));
2164 case LTTNG_ROTATION_GET_INFO
:
2166 struct lttng_rotation_get_info_return get_info_return
;
2168 memset(&get_info_return
, 0, sizeof(get_info_return
));
2169 ret
= cmd_rotate_get_info(cmd_ctx
->session
, &get_info_return
,
2170 cmd_ctx
->lsm
.u
.get_rotation_info
.rotation_id
);
2176 ret
= setup_lttng_msg_no_cmd_header(cmd_ctx
, &get_info_return
,
2177 sizeof(get_info_return
));
2186 case LTTNG_ROTATION_SET_SCHEDULE
:
2189 enum lttng_rotation_schedule_type schedule_type
;
2192 if (cmd_ctx
->session
->kernel_session
&& !check_rotate_compatible()) {
2193 DBG("Kernel tracer version does not support session rotations");
2194 ret
= LTTNG_ERR_ROTATION_WRONG_VERSION
;
2198 set_schedule
= cmd_ctx
->lsm
.u
.rotation_set_schedule
.set
== 1;
2199 schedule_type
= (enum lttng_rotation_schedule_type
) cmd_ctx
->lsm
.u
.rotation_set_schedule
.type
;
2200 value
= cmd_ctx
->lsm
.u
.rotation_set_schedule
.value
;
2202 ret
= cmd_rotation_set_schedule(cmd_ctx
->session
, set_schedule
,
2203 schedule_type
, value
,
2204 the_notification_thread_handle
);
2205 if (ret
!= LTTNG_OK
) {
2211 case LTTNG_SESSION_LIST_ROTATION_SCHEDULES
:
2213 lttng_session_list_schedules_return schedules
;
2215 schedules
.periodic
.set
= !!cmd_ctx
->session
->rotate_timer_period
;
2216 schedules
.periodic
.value
= cmd_ctx
->session
->rotate_timer_period
;
2217 schedules
.size
.set
= !!cmd_ctx
->session
->rotate_size
;
2218 schedules
.size
.value
= cmd_ctx
->session
->rotate_size
;
2220 ret
= setup_lttng_msg_no_cmd_header(cmd_ctx
, &schedules
,
2230 case LTTNG_CLEAR_SESSION
:
2232 ret
= cmd_clear_session(cmd_ctx
->session
, sock
);
2235 case LTTNG_LIST_TRIGGERS
:
2237 struct lttng_triggers
*return_triggers
= NULL
;
2238 size_t original_payload_size
;
2239 size_t payload_size
;
2241 ret
= setup_empty_lttng_msg(cmd_ctx
);
2243 ret
= LTTNG_ERR_NOMEM
;
2247 original_payload_size
= cmd_ctx
->reply_payload
.buffer
.size
;
2249 ret
= cmd_list_triggers(cmd_ctx
, the_notification_thread_handle
,
2251 if (ret
!= LTTNG_OK
) {
2255 LTTNG_ASSERT(return_triggers
);
2256 ret
= lttng_triggers_serialize(
2257 return_triggers
, &cmd_ctx
->reply_payload
);
2258 lttng_triggers_destroy(return_triggers
);
2260 ERR("Failed to serialize triggers in reply to `list triggers` command");
2261 ret
= LTTNG_ERR_NOMEM
;
2265 payload_size
= cmd_ctx
->reply_payload
.buffer
.size
-
2266 original_payload_size
;
2268 update_lttng_msg(cmd_ctx
, 0, payload_size
);
2273 case LTTNG_EXECUTE_ERROR_QUERY
:
2275 struct lttng_error_query
*query
;
2276 const struct lttng_credentials cmd_creds
= {
2277 .uid
= LTTNG_OPTIONAL_INIT_VALUE(cmd_ctx
->creds
.uid
),
2278 .gid
= LTTNG_OPTIONAL_INIT_VALUE(cmd_ctx
->creds
.gid
),
2280 struct lttng_error_query_results
*results
= NULL
;
2281 size_t original_payload_size
;
2282 size_t payload_size
;
2284 ret
= setup_empty_lttng_msg(cmd_ctx
);
2286 ret
= LTTNG_ERR_NOMEM
;
2290 original_payload_size
= cmd_ctx
->reply_payload
.buffer
.size
;
2292 ret
= receive_lttng_error_query(
2293 cmd_ctx
, *sock
, sock_error
, &query
);
2294 if (ret
!= LTTNG_OK
) {
2298 ret
= cmd_execute_error_query(&cmd_creds
, query
, &results
,
2299 the_notification_thread_handle
);
2300 lttng_error_query_destroy(query
);
2301 if (ret
!= LTTNG_OK
) {
2305 LTTNG_ASSERT(results
);
2306 ret
= lttng_error_query_results_serialize(
2307 results
, &cmd_ctx
->reply_payload
);
2308 lttng_error_query_results_destroy(results
);
2310 ERR("Failed to serialize error query result set in reply to `execute error query` command");
2311 ret
= LTTNG_ERR_NOMEM
;
2315 payload_size
= cmd_ctx
->reply_payload
.buffer
.size
-
2316 original_payload_size
;
2318 update_lttng_msg(cmd_ctx
, 0, payload_size
);
2325 ret
= LTTNG_ERR_UND
;
2330 if (cmd_ctx
->reply_payload
.buffer
.size
== 0) {
2331 DBG("Missing llm header, creating one.");
2332 if (setup_lttng_msg_no_cmd_header(cmd_ctx
, NULL
, 0) < 0) {
2336 /* Set return code */
2337 ((struct lttcomm_lttng_msg
*) (cmd_ctx
->reply_payload
.buffer
.data
))->ret_code
= ret
;
2339 if (cmd_ctx
->session
) {
2340 session_unlock(cmd_ctx
->session
);
2341 session_put(cmd_ctx
->session
);
2342 cmd_ctx
->session
= NULL
;
2344 if (need_tracing_session
) {
2345 session_unlock_list();
2348 LTTNG_ASSERT(!rcu_read_ongoing());
2352 static int create_client_sock(void)
2354 int ret
, client_sock
;
2355 const mode_t old_umask
= umask(0);
2357 /* Create client tool unix socket */
2358 client_sock
= lttcomm_create_unix_sock(
2359 the_config
.client_unix_sock_path
.value
);
2360 if (client_sock
< 0) {
2361 ERR("Create unix sock failed: %s",
2362 the_config
.client_unix_sock_path
.value
);
2367 /* Set the cloexec flag */
2368 ret
= utils_set_fd_cloexec(client_sock
);
2370 ERR("Unable to set CLOEXEC flag to the client Unix socket (fd: %d). "
2371 "Continuing but note that the consumer daemon will have a "
2372 "reference to this socket on exec()", client_sock
);
2375 /* File permission MUST be 660 */
2376 ret
= chmod(the_config
.client_unix_sock_path
.value
,
2377 S_IRUSR
| S_IWUSR
| S_IRGRP
| S_IWGRP
);
2379 ERR("Set file permissions failed: %s",
2380 the_config
.client_unix_sock_path
.value
);
2382 (void) lttcomm_close_unix_sock(client_sock
);
2386 DBG("Created client socket (fd = %i)", client_sock
);
2393 static void cleanup_client_thread(void *data
)
2395 struct lttng_pipe
*quit_pipe
= (lttng_pipe
*) data
;
2397 lttng_pipe_destroy(quit_pipe
);
2400 static void thread_init_cleanup(void *data
)
2402 set_thread_status(false);
2406 * This thread manage all clients request using the unix client socket for
2409 static void *thread_manage_clients(void *data
)
2411 int sock
= -1, ret
, i
, pollfd
, err
= -1;
2413 uint32_t revents
, nb_fd
;
2414 struct lttng_poll_event events
;
2415 const int client_sock
= thread_state
.client_sock
;
2416 struct lttng_pipe
*quit_pipe
= (lttng_pipe
*) data
;
2417 const int thread_quit_pipe_fd
= lttng_pipe_get_readfd(quit_pipe
);
2418 struct command_ctx cmd_ctx
= {};
2420 DBG("[thread] Manage client started");
2422 lttng_payload_init(&cmd_ctx
.reply_payload
);
2424 is_root
= (getuid() == 0);
2426 pthread_cleanup_push(thread_init_cleanup
, NULL
);
2428 rcu_register_thread();
2430 health_register(the_health_sessiond
, HEALTH_SESSIOND_TYPE_CMD
);
2432 health_code_update();
2434 ret
= lttcomm_listen_unix_sock(client_sock
);
2440 * Pass 2 as size here for the thread quit pipe and client_sock. Nothing
2441 * more will be added to this poll set.
2443 ret
= lttng_poll_create(&events
, 2, LTTNG_CLOEXEC
);
2445 goto error_create_poll
;
2448 /* Add the application registration socket */
2449 ret
= lttng_poll_add(&events
, client_sock
, LPOLLIN
| LPOLLPRI
);
2454 /* Add thread quit pipe */
2455 ret
= lttng_poll_add(&events
, thread_quit_pipe_fd
, LPOLLIN
| LPOLLERR
);
2460 /* Set state as running. */
2461 set_thread_status(true);
2462 pthread_cleanup_pop(0);
2464 /* This testpoint is after we signal readiness to the parent. */
2465 if (testpoint(sessiond_thread_manage_clients
)) {
2469 if (testpoint(sessiond_thread_manage_clients_before_loop
)) {
2473 health_code_update();
2476 const struct cmd_completion_handler
*cmd_completion_handler
;
2478 cmd_ctx
.creds
.uid
= UINT32_MAX
;
2479 cmd_ctx
.creds
.gid
= UINT32_MAX
;
2480 cmd_ctx
.creds
.pid
= 0;
2481 cmd_ctx
.session
= NULL
;
2482 lttng_payload_clear(&cmd_ctx
.reply_payload
);
2483 cmd_ctx
.lttng_msg_size
= 0;
2485 DBG("Accepting client command ...");
2487 /* Inifinite blocking call, waiting for transmission */
2489 health_poll_entry();
2490 ret
= lttng_poll_wait(&events
, -1);
2494 * Restart interrupted system call.
2496 if (errno
== EINTR
) {
2504 for (i
= 0; i
< nb_fd
; i
++) {
2505 revents
= LTTNG_POLL_GETEV(&events
, i
);
2506 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
2508 health_code_update();
2510 if (pollfd
== thread_quit_pipe_fd
) {
2514 /* Event on the registration socket */
2515 if (revents
& LPOLLIN
) {
2517 } else if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
2518 ERR("Client socket poll error");
2521 ERR("Unexpected poll events %u for sock %d", revents
, pollfd
);
2527 DBG("Wait for client response");
2529 health_code_update();
2531 sock
= lttcomm_accept_unix_sock(client_sock
);
2537 * Set the CLOEXEC flag. Return code is useless because either way, the
2540 (void) utils_set_fd_cloexec(sock
);
2542 /* Set socket option for credentials retrieval */
2543 ret
= lttcomm_setsockopt_creds_unix_sock(sock
);
2548 health_code_update();
2551 * Data is received from the lttng client. The struct
2552 * lttcomm_session_msg (lsm) contains the command and data request of
2555 DBG("Receiving data from client ...");
2556 ret
= lttcomm_recv_creds_unix_sock(sock
, &cmd_ctx
.lsm
,
2557 sizeof(struct lttcomm_session_msg
), &cmd_ctx
.creds
);
2558 if (ret
!= sizeof(struct lttcomm_session_msg
)) {
2559 DBG("Incomplete recv() from client... continuing");
2568 health_code_update();
2570 // TODO: Validate cmd_ctx including sanity check for
2571 // security purpose.
2573 rcu_thread_online();
2575 * This function dispatch the work to the kernel or userspace tracer
2576 * libs and fill the lttcomm_lttng_msg data structure of all the needed
2577 * informations for the client. The command context struct contains
2578 * everything this function may needs.
2580 ret
= process_client_msg(&cmd_ctx
, &sock
, &sock_error
);
2581 rcu_thread_offline();
2591 * TODO: Inform client somehow of the fatal error. At
2592 * this point, ret < 0 means that a zmalloc failed
2593 * (ENOMEM). Error detected but still accept
2594 * command, unless a socket error has been
2600 if (ret
< LTTNG_OK
|| ret
>= LTTNG_ERR_NR
) {
2601 WARN("Command returned an invalid status code, returning unknown error: "
2602 "command type = %s (%d), ret = %d",
2603 lttcomm_sessiond_command_str((lttcomm_sessiond_command
) cmd_ctx
.lsm
.cmd_type
),
2604 cmd_ctx
.lsm
.cmd_type
, ret
);
2605 ret
= LTTNG_ERR_UNK
;
2608 cmd_completion_handler
= cmd_pop_completion_handler();
2609 if (cmd_completion_handler
) {
2610 enum lttng_error_code completion_code
;
2612 completion_code
= cmd_completion_handler
->run(
2613 cmd_completion_handler
->data
);
2614 if (completion_code
!= LTTNG_OK
) {
2619 health_code_update();
2622 struct lttng_payload_view view
=
2623 lttng_payload_view_from_payload(
2624 &cmd_ctx
.reply_payload
,
2626 struct lttcomm_lttng_msg
*llm
= (typeof(
2627 llm
)) cmd_ctx
.reply_payload
.buffer
.data
;
2629 LTTNG_ASSERT(cmd_ctx
.reply_payload
.buffer
.size
>= sizeof(*llm
));
2630 LTTNG_ASSERT(cmd_ctx
.lttng_msg_size
== cmd_ctx
.reply_payload
.buffer
.size
);
2632 llm
->fd_count
= lttng_payload_view_get_fd_handle_count(&view
);
2634 DBG("Sending response (size: %d, retcode: %s (%d))",
2635 cmd_ctx
.lttng_msg_size
,
2636 lttng_strerror(-llm
->ret_code
),
2638 ret
= send_unix_sock(sock
, &view
);
2640 ERR("Failed to send data back to client");
2643 /* End of transmission */
2651 health_code_update();
2663 lttng_poll_clean(&events
);
2667 unlink(the_config
.client_unix_sock_path
.value
);
2668 ret
= close(client_sock
);
2675 ERR("Health error occurred in %s", __func__
);
2678 health_unregister(the_health_sessiond
);
2680 DBG("Client thread dying");
2681 lttng_payload_reset(&cmd_ctx
.reply_payload
);
2682 rcu_unregister_thread();
2687 bool shutdown_client_thread(void *thread_data
)
2689 struct lttng_pipe
*client_quit_pipe
= (lttng_pipe
*) thread_data
;
2690 const int write_fd
= lttng_pipe_get_writefd(client_quit_pipe
);
2692 return notify_thread_pipe(write_fd
) == 1;
2695 struct lttng_thread
*launch_client_thread(void)
2697 bool thread_running
;
2698 struct lttng_pipe
*client_quit_pipe
;
2699 struct lttng_thread
*thread
= NULL
;
2700 int client_sock_fd
= -1;
2702 sem_init(&thread_state
.ready
, 0, 0);
2703 client_quit_pipe
= lttng_pipe_open(FD_CLOEXEC
);
2704 if (!client_quit_pipe
) {
2708 client_sock_fd
= create_client_sock();
2709 if (client_sock_fd
< 0) {
2713 thread_state
.client_sock
= client_sock_fd
;
2714 thread
= lttng_thread_create("Client management",
2715 thread_manage_clients
,
2716 shutdown_client_thread
,
2717 cleanup_client_thread
,
2722 /* The client thread now owns the client sock fd and the quit pipe. */
2723 client_sock_fd
= -1;
2724 client_quit_pipe
= NULL
;
2727 * This thread is part of the threads that need to be fully
2728 * initialized before the session daemon is marked as "ready".
2730 thread_running
= wait_thread_status();
2731 if (!thread_running
) {
2736 if (client_sock_fd
>= 0) {
2737 if (close(client_sock_fd
)) {
2738 PERROR("Failed to close client socket");
2741 lttng_thread_put(thread
);
2742 cleanup_client_thread(client_quit_pipe
);