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Fix: agent port file is o+w when launching as root
[lttng-tools.git] / src / bin / lttng-sessiond / client.c
1 /*
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>
5 *
6 * SPDX-License-Identifier: GPL-2.0-only
7 *
8 */
9
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>
29 #include <pthread.h>
30 #include <signal.h>
31 #include <stddef.h>
32 #include <stdint.h>
33 #include <sys/stat.h>
34 #include <unistd.h>
35
36 #include "agent-thread.h"
37 #include "clear.h"
38 #include "client.h"
39 #include "cmd.h"
40 #include "health-sessiond.h"
41 #include "kernel.h"
42 #include "lttng-sessiond.h"
43 #include "manage-consumer.h"
44 #include "save.h"
45 #include "testpoint.h"
46 #include "utils.h"
47
48 static bool is_root;
49
50 static struct thread_state {
51 sem_t ready;
52 bool running;
53 int client_sock;
54 } thread_state;
55
56 static void set_thread_status(bool running)
57 {
58 DBG("Marking client thread's state as %s", running ? "running" : "error");
59 thread_state.running = running;
60 sem_post(&thread_state.ready);
61 }
62
63 static bool wait_thread_status(void)
64 {
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");
69 } else {
70 ERR("Initialization of client thread failed");
71 }
72
73 return thread_state.running;
74 }
75
76 /*
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
79 * structure.
80 *
81 * Return 0 on success, negative value on error.
82 */
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)
86 {
87 int ret = 0;
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 const struct lttcomm_lttng_msg llm = {
91 .cmd_type = cmd_ctx->lsm.cmd_type,
92 .pid = cmd_ctx->lsm.domain.attr.pid,
93 .cmd_header_size = cmd_header_len,
94 .data_size = payload_len,
95 };
96
97 ret = lttng_dynamic_buffer_set_size(&cmd_ctx->reply_payload.buffer, 0);
98 if (ret) {
99 goto end;
100 }
101
102 lttng_dynamic_pointer_array_clear(&cmd_ctx->reply_payload._fd_handles);
103
104 cmd_ctx->lttng_msg_size = total_msg_size;
105
106 /* Append reply header. */
107 ret = lttng_dynamic_buffer_append(
108 &cmd_ctx->reply_payload.buffer, &llm, sizeof(llm));
109 if (ret) {
110 goto end;
111 }
112
113 /* Append command header. */
114 if (cmd_header_len) {
115 ret = lttng_dynamic_buffer_append(
116 &cmd_ctx->reply_payload.buffer, cmd_header_buf,
117 cmd_header_len);
118 if (ret) {
119 goto end;
120 }
121 }
122
123 /* Append payload. */
124 if (payload_len) {
125 ret = lttng_dynamic_buffer_append(
126 &cmd_ctx->reply_payload.buffer, payload_buf,
127 payload_len);
128 if (ret) {
129 goto end;
130 }
131 }
132
133 end:
134 return ret;
135 }
136
137 static int setup_empty_lttng_msg(struct command_ctx *cmd_ctx)
138 {
139 int ret;
140 const struct lttcomm_lttng_msg llm = {};
141
142 ret = lttng_dynamic_buffer_set_size(&cmd_ctx->reply_payload.buffer, 0);
143 if (ret) {
144 goto end;
145 }
146
147 /* Append place-holder reply header. */
148 ret = lttng_dynamic_buffer_append(
149 &cmd_ctx->reply_payload.buffer, &llm, sizeof(llm));
150 if (ret) {
151 goto end;
152 }
153
154 cmd_ctx->lttng_msg_size = sizeof(llm);
155 end:
156 return ret;
157 }
158
159 static void update_lttng_msg(struct command_ctx *cmd_ctx, size_t cmd_header_len,
160 size_t payload_len)
161 {
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 const struct lttcomm_lttng_msg llm = {
165 .cmd_type = cmd_ctx->lsm.cmd_type,
166 .pid = cmd_ctx->lsm.domain.attr.pid,
167 .cmd_header_size = cmd_header_len,
168 .data_size = payload_len,
169 };
170 struct lttcomm_lttng_msg *p_llm;
171
172 assert(cmd_ctx->reply_payload.buffer.size >= sizeof(llm));
173
174 p_llm = (typeof(p_llm)) cmd_ctx->reply_payload.buffer.data;
175
176 /* Update existing header. */
177 memcpy(p_llm, &llm, sizeof(llm));
178
179 cmd_ctx->lttng_msg_size = total_msg_size;
180 }
181
182 /*
183 * Start the thread_manage_consumer. This must be done after a lttng-consumerd
184 * exec or it will fail.
185 */
186 static int spawn_consumer_thread(struct consumer_data *consumer_data)
187 {
188 return launch_consumer_management_thread(consumer_data) ? 0 : -1;
189 }
190
191 /*
192 * Fork and exec a consumer daemon (consumerd).
193 *
194 * Return pid if successful else -1.
195 */
196 static pid_t spawn_consumerd(struct consumer_data *consumer_data)
197 {
198 int ret;
199 pid_t pid;
200 const char *consumer_to_use;
201 const char *verbosity;
202 struct stat st;
203
204 DBG("Spawning consumerd");
205
206 pid = fork();
207 if (pid == 0) {
208 /*
209 * Exec consumerd.
210 */
211 if (the_config.verbose_consumer) {
212 verbosity = "--verbose";
213 } else if (lttng_opt_quiet) {
214 verbosity = "--quiet";
215 } else {
216 verbosity = "";
217 }
218
219 switch (consumer_data->type) {
220 case LTTNG_CONSUMER_KERNEL:
221 /*
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,
225 */
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;
240 } else {
241 DBG("Could not find any valid consumerd executable");
242 ret = -EINVAL;
243 goto error;
244 }
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,
251 "--group",
252 the_config.tracing_group_name.value,
253 NULL);
254 break;
255 case LTTNG_CONSUMER64_UST:
256 {
257 if (the_config.consumerd64_lib_dir.value) {
258 const char *tmp;
259 size_t tmplen;
260 char *tmpnew;
261
262 tmp = lttng_secure_getenv("LD_LIBRARY_PATH");
263 if (!tmp) {
264 tmp = "";
265 }
266 tmplen = strlen(the_config.consumerd64_lib_dir.value) + 1 /* : */ + strlen(tmp);
267 tmpnew = zmalloc(tmplen + 1 /* \0 */);
268 if (!tmpnew) {
269 ret = -ENOMEM;
270 goto error;
271 }
272 strcat(tmpnew, the_config.consumerd64_lib_dir.value);
273 if (tmp[0] != '\0') {
274 strcat(tmpnew, ":");
275 strcat(tmpnew, tmp);
276 }
277 ret = setenv("LD_LIBRARY_PATH", tmpnew, 1);
278 free(tmpnew);
279 if (ret) {
280 ret = -errno;
281 goto error;
282 }
283 }
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,
292 "--group",
293 the_config.tracing_group_name.value,
294 NULL);
295 break;
296 }
297 case LTTNG_CONSUMER32_UST:
298 {
299 if (the_config.consumerd32_lib_dir.value) {
300 const char *tmp;
301 size_t tmplen;
302 char *tmpnew;
303
304 tmp = lttng_secure_getenv("LD_LIBRARY_PATH");
305 if (!tmp) {
306 tmp = "";
307 }
308 tmplen = strlen(the_config.consumerd32_lib_dir.value) + 1 /* : */ + strlen(tmp);
309 tmpnew = zmalloc(tmplen + 1 /* \0 */);
310 if (!tmpnew) {
311 ret = -ENOMEM;
312 goto error;
313 }
314 strcat(tmpnew, the_config.consumerd32_lib_dir.value);
315 if (tmp[0] != '\0') {
316 strcat(tmpnew, ":");
317 strcat(tmpnew, tmp);
318 }
319 ret = setenv("LD_LIBRARY_PATH", tmpnew, 1);
320 free(tmpnew);
321 if (ret) {
322 ret = -errno;
323 goto error;
324 }
325 }
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,
334 "--group",
335 the_config.tracing_group_name.value,
336 NULL);
337 break;
338 }
339 default:
340 ERR("unknown consumer type");
341 errno = 0;
342 }
343 if (errno != 0) {
344 PERROR("Consumer execl()");
345 }
346 /* Reaching this point, we got a failure on our execl(). */
347 exit(EXIT_FAILURE);
348 } else if (pid > 0) {
349 ret = pid;
350 } else {
351 PERROR("start consumer fork");
352 ret = -errno;
353 }
354 error:
355 return ret;
356 }
357
358 /*
359 * Spawn the consumerd daemon and session daemon thread.
360 */
361 static int start_consumerd(struct consumer_data *consumer_data)
362 {
363 int ret;
364
365 /*
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.
369 */
370 ret = lttcomm_listen_unix_sock(consumer_data->err_sock);
371 if (ret < 0) {
372 goto error;
373 }
374
375 pthread_mutex_lock(&consumer_data->pid_mutex);
376 if (consumer_data->pid != 0) {
377 pthread_mutex_unlock(&consumer_data->pid_mutex);
378 goto end;
379 }
380
381 ret = spawn_consumerd(consumer_data);
382 if (ret < 0) {
383 ERR("Spawning consumerd failed");
384 pthread_mutex_unlock(&consumer_data->pid_mutex);
385 goto error;
386 }
387
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);
392
393 DBG2("Spawning consumer control thread");
394 ret = spawn_consumer_thread(consumer_data);
395 if (ret < 0) {
396 ERR("Fatal error spawning consumer control thread");
397 goto error;
398 }
399
400 end:
401 return 0;
402
403 error:
404 /* Cleanup already created sockets on error. */
405 if (consumer_data->err_sock >= 0) {
406 int err;
407
408 err = close(consumer_data->err_sock);
409 if (err < 0) {
410 PERROR("close consumer data error socket");
411 }
412 }
413 return ret;
414 }
415
416 /*
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.
420 *
421 * Should *NOT* be called with RCU read-side lock held.
422 */
423 static int copy_session_consumer(int domain, struct ltt_session *session)
424 {
425 int ret;
426 const char *dir_name;
427 struct consumer_output *consumer;
428
429 assert(session);
430 assert(session->consumer);
431
432 switch (domain) {
433 case LTTNG_DOMAIN_KERNEL:
434 DBG3("Copying tracing session consumer output in kernel session");
435 /*
436 * XXX: We should audit the session creation and what this function
437 * does "extra" in order to avoid a destroy since this function is used
438 * in the domain session creation (kernel and ust) only. Same for UST
439 * domain.
440 */
441 if (session->kernel_session->consumer) {
442 consumer_output_put(session->kernel_session->consumer);
443 }
444 session->kernel_session->consumer =
445 consumer_copy_output(session->consumer);
446 /* Ease our life a bit for the next part */
447 consumer = session->kernel_session->consumer;
448 dir_name = DEFAULT_KERNEL_TRACE_DIR;
449 break;
450 case LTTNG_DOMAIN_JUL:
451 case LTTNG_DOMAIN_LOG4J:
452 case LTTNG_DOMAIN_PYTHON:
453 case LTTNG_DOMAIN_UST:
454 DBG3("Copying tracing session consumer output in UST session");
455 if (session->ust_session->consumer) {
456 consumer_output_put(session->ust_session->consumer);
457 }
458 session->ust_session->consumer =
459 consumer_copy_output(session->consumer);
460 /* Ease our life a bit for the next part */
461 consumer = session->ust_session->consumer;
462 dir_name = DEFAULT_UST_TRACE_DIR;
463 break;
464 default:
465 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
466 goto error;
467 }
468
469 /* Append correct directory to subdir */
470 ret = lttng_strncpy(consumer->domain_subdir, dir_name,
471 sizeof(consumer->domain_subdir));
472 if (ret) {
473 ret = LTTNG_ERR_UNK;
474 goto error;
475 }
476 DBG3("Copy session consumer subdir %s", consumer->domain_subdir);
477 ret = LTTNG_OK;
478
479 error:
480 return ret;
481 }
482
483 /*
484 * Create an UST session and add it to the session ust list.
485 *
486 * Should *NOT* be called with RCU read-side lock held.
487 */
488 static int create_ust_session(struct ltt_session *session,
489 const struct lttng_domain *domain)
490 {
491 int ret;
492 struct ltt_ust_session *lus = NULL;
493
494 assert(session);
495 assert(domain);
496 assert(session->consumer);
497
498 switch (domain->type) {
499 case LTTNG_DOMAIN_JUL:
500 case LTTNG_DOMAIN_LOG4J:
501 case LTTNG_DOMAIN_PYTHON:
502 case LTTNG_DOMAIN_UST:
503 break;
504 default:
505 ERR("Unknown UST domain on create session %d", domain->type);
506 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
507 goto error;
508 }
509
510 DBG("Creating UST session");
511
512 lus = trace_ust_create_session(session->id);
513 if (lus == NULL) {
514 ret = LTTNG_ERR_UST_SESS_FAIL;
515 goto error;
516 }
517
518 lus->uid = session->uid;
519 lus->gid = session->gid;
520 lus->output_traces = session->output_traces;
521 lus->snapshot_mode = session->snapshot_mode;
522 lus->live_timer_interval = session->live_timer;
523 session->ust_session = lus;
524 if (session->shm_path[0]) {
525 strncpy(lus->root_shm_path, session->shm_path,
526 sizeof(lus->root_shm_path));
527 lus->root_shm_path[sizeof(lus->root_shm_path) - 1] = '\0';
528 strncpy(lus->shm_path, session->shm_path,
529 sizeof(lus->shm_path));
530 lus->shm_path[sizeof(lus->shm_path) - 1] = '\0';
531 strncat(lus->shm_path, "/ust",
532 sizeof(lus->shm_path) - strlen(lus->shm_path) - 1);
533 }
534 /* Copy session output to the newly created UST session */
535 ret = copy_session_consumer(domain->type, session);
536 if (ret != LTTNG_OK) {
537 goto error;
538 }
539
540 return LTTNG_OK;
541
542 error:
543 free(lus);
544 session->ust_session = NULL;
545 return ret;
546 }
547
548 /*
549 * Create a kernel tracer session then create the default channel.
550 */
551 static int create_kernel_session(struct ltt_session *session)
552 {
553 int ret;
554
555 DBG("Creating kernel session");
556
557 ret = kernel_create_session(session);
558 if (ret < 0) {
559 ret = LTTNG_ERR_KERN_SESS_FAIL;
560 goto error_create;
561 }
562
563 /* Code flow safety */
564 assert(session->kernel_session);
565
566 /* Copy session output to the newly created Kernel session */
567 ret = copy_session_consumer(LTTNG_DOMAIN_KERNEL, session);
568 if (ret != LTTNG_OK) {
569 goto error;
570 }
571
572 session->kernel_session->uid = session->uid;
573 session->kernel_session->gid = session->gid;
574 session->kernel_session->output_traces = session->output_traces;
575 session->kernel_session->snapshot_mode = session->snapshot_mode;
576 session->kernel_session->is_live_session = session->live_timer != 0;
577
578 return LTTNG_OK;
579
580 error:
581 trace_kernel_destroy_session(session->kernel_session);
582 session->kernel_session = NULL;
583 error_create:
584 return ret;
585 }
586
587 /*
588 * Count number of session permitted by uid/gid.
589 */
590 static unsigned int lttng_sessions_count(uid_t uid, gid_t gid)
591 {
592 unsigned int i = 0;
593 struct ltt_session *session;
594 const struct ltt_session_list *session_list = session_get_list();
595
596 DBG("Counting number of available session for UID %d", uid);
597 cds_list_for_each_entry(session, &session_list->head, list) {
598 if (!session_get(session)) {
599 continue;
600 }
601 session_lock(session);
602 /* Only count the sessions the user can control. */
603 if (session_access_ok(session, uid) &&
604 !session->destroyed) {
605 i++;
606 }
607 session_unlock(session);
608 session_put(session);
609 }
610 return i;
611 }
612
613 static enum lttng_error_code receive_lttng_trigger(struct command_ctx *cmd_ctx,
614 int sock,
615 int *sock_error,
616 struct lttng_trigger **_trigger)
617 {
618 int ret;
619 size_t trigger_len;
620 ssize_t sock_recv_len;
621 enum lttng_error_code ret_code;
622 struct lttng_payload trigger_payload;
623 struct lttng_trigger *trigger = NULL;
624
625 lttng_payload_init(&trigger_payload);
626 trigger_len = (size_t) cmd_ctx->lsm.u.trigger.length;
627 ret = lttng_dynamic_buffer_set_size(
628 &trigger_payload.buffer, trigger_len);
629 if (ret) {
630 ret_code = LTTNG_ERR_NOMEM;
631 goto end;
632 }
633
634 sock_recv_len = lttcomm_recv_unix_sock(
635 sock, trigger_payload.buffer.data, trigger_len);
636 if (sock_recv_len < 0 || sock_recv_len != trigger_len) {
637 ERR("Failed to receive trigger in command payload");
638 *sock_error = 1;
639 ret_code = LTTNG_ERR_INVALID_PROTOCOL;
640 goto end;
641 }
642
643 /* Receive fds, if any. */
644 if (cmd_ctx->lsm.fd_count > 0) {
645 sock_recv_len = lttcomm_recv_payload_fds_unix_sock(
646 sock, cmd_ctx->lsm.fd_count, &trigger_payload);
647 if (sock_recv_len > 0 &&
648 sock_recv_len != cmd_ctx->lsm.fd_count * sizeof(int)) {
649 ERR("Failed to receive all file descriptors for trigger in command payload: expected fd count = %u, ret = %d",
650 cmd_ctx->lsm.fd_count, (int) ret);
651 ret_code = LTTNG_ERR_INVALID_PROTOCOL;
652 *sock_error = 1;
653 goto end;
654 } else if (sock_recv_len <= 0) {
655 ERR("Failed to receive file descriptors for trigger in command payload: expected fd count = %u, ret = %d",
656 cmd_ctx->lsm.fd_count, (int) ret);
657 ret_code = LTTNG_ERR_FATAL;
658 *sock_error = 1;
659 goto end;
660 }
661 }
662
663 /* Deserialize trigger. */
664 {
665 struct lttng_payload_view view =
666 lttng_payload_view_from_payload(
667 &trigger_payload, 0, -1);
668
669 if (lttng_trigger_create_from_payload(&view, &trigger) !=
670 trigger_len) {
671 ERR("Invalid trigger received as part of command payload");
672 ret_code = LTTNG_ERR_INVALID_TRIGGER;
673 lttng_trigger_put(trigger);
674 goto end;
675 }
676 }
677
678 *_trigger = trigger;
679 ret_code = LTTNG_OK;
680
681 end:
682 lttng_payload_reset(&trigger_payload);
683 return ret_code;
684 }
685
686 static enum lttng_error_code receive_lttng_error_query(struct command_ctx *cmd_ctx,
687 int sock,
688 int *sock_error,
689 struct lttng_error_query **_query)
690 {
691 int ret;
692 size_t query_len;
693 ssize_t sock_recv_len;
694 enum lttng_error_code ret_code;
695 struct lttng_payload query_payload;
696 struct lttng_error_query *query = NULL;
697
698 lttng_payload_init(&query_payload);
699 query_len = (size_t) cmd_ctx->lsm.u.error_query.length;
700 ret = lttng_dynamic_buffer_set_size(&query_payload.buffer, query_len);
701 if (ret) {
702 ret_code = LTTNG_ERR_NOMEM;
703 goto end;
704 }
705
706 sock_recv_len = lttcomm_recv_unix_sock(
707 sock, query_payload.buffer.data, query_len);
708 if (sock_recv_len < 0 || sock_recv_len != query_len) {
709 ERR("Failed to receive error query in command payload");
710 *sock_error = 1;
711 ret_code = LTTNG_ERR_INVALID_PROTOCOL;
712 goto end;
713 }
714
715 /* Receive fds, if any. */
716 if (cmd_ctx->lsm.fd_count > 0) {
717 sock_recv_len = lttcomm_recv_payload_fds_unix_sock(
718 sock, cmd_ctx->lsm.fd_count, &query_payload);
719 if (sock_recv_len > 0 &&
720 sock_recv_len != cmd_ctx->lsm.fd_count * sizeof(int)) {
721 ERR("Failed to receive all file descriptors for error query in command payload: expected fd count = %u, ret = %d",
722 cmd_ctx->lsm.fd_count, (int) ret);
723 ret_code = LTTNG_ERR_INVALID_PROTOCOL;
724 *sock_error = 1;
725 goto end;
726 } else if (sock_recv_len <= 0) {
727 ERR("Failed to receive file descriptors for error query in command payload: expected fd count = %u, ret = %d",
728 cmd_ctx->lsm.fd_count, (int) ret);
729 ret_code = LTTNG_ERR_FATAL;
730 *sock_error = 1;
731 goto end;
732 }
733 }
734
735 /* Deserialize error query. */
736 {
737 struct lttng_payload_view view =
738 lttng_payload_view_from_payload(
739 &query_payload, 0, -1);
740
741 if (lttng_error_query_create_from_payload(&view, &query) !=
742 query_len) {
743 ERR("Invalid error query received as part of command payload");
744 ret_code = LTTNG_ERR_INVALID_PROTOCOL;
745 goto end;
746 }
747 }
748
749 *_query = query;
750 ret_code = LTTNG_OK;
751
752 end:
753 lttng_payload_reset(&query_payload);
754 return ret_code;
755 }
756
757 static enum lttng_error_code receive_lttng_event(struct command_ctx *cmd_ctx,
758 int sock,
759 int *sock_error,
760 struct lttng_event **out_event,
761 char **out_filter_expression,
762 struct lttng_bytecode **out_bytecode,
763 struct lttng_event_exclusion **out_exclusion)
764 {
765 int ret;
766 size_t event_len;
767 ssize_t sock_recv_len;
768 enum lttng_error_code ret_code;
769 struct lttng_payload event_payload;
770 struct lttng_event *local_event = NULL;
771 char *local_filter_expression = NULL;
772 struct lttng_bytecode *local_bytecode = NULL;
773 struct lttng_event_exclusion *local_exclusion = NULL;
774
775 lttng_payload_init(&event_payload);
776 if (cmd_ctx->lsm.cmd_type == LTTNG_ENABLE_EVENT) {
777 event_len = (size_t) cmd_ctx->lsm.u.enable.length;
778 } else if (cmd_ctx->lsm.cmd_type == LTTNG_DISABLE_EVENT) {
779 event_len = (size_t) cmd_ctx->lsm.u.disable.length;
780 } else {
781 abort();
782 }
783
784 ret = lttng_dynamic_buffer_set_size(&event_payload.buffer, event_len);
785 if (ret) {
786 ret_code = LTTNG_ERR_NOMEM;
787 goto end;
788 }
789
790 sock_recv_len = lttcomm_recv_unix_sock(
791 sock, event_payload.buffer.data, event_len);
792 if (sock_recv_len < 0 || sock_recv_len != event_len) {
793 ERR("Failed to receive event in command payload");
794 *sock_error = 1;
795 ret_code = LTTNG_ERR_INVALID_PROTOCOL;
796 goto end;
797 }
798
799 /* Receive fds, if any. */
800 if (cmd_ctx->lsm.fd_count > 0) {
801 sock_recv_len = lttcomm_recv_payload_fds_unix_sock(
802 sock, cmd_ctx->lsm.fd_count, &event_payload);
803 if (sock_recv_len > 0 &&
804 sock_recv_len != cmd_ctx->lsm.fd_count * sizeof(int)) {
805 ERR("Failed to receive all file descriptors for event in command payload: expected fd count = %u, ret = %d",
806 cmd_ctx->lsm.fd_count, (int) ret);
807 ret_code = LTTNG_ERR_INVALID_PROTOCOL;
808 *sock_error = 1;
809 goto end;
810 } else if (sock_recv_len <= 0) {
811 ERR("Failed to receive file descriptors for event in command payload: expected fd count = %u, ret = %d",
812 cmd_ctx->lsm.fd_count, (int) ret);
813 ret_code = LTTNG_ERR_FATAL;
814 *sock_error = 1;
815 goto end;
816 }
817 }
818
819 /* Deserialize event. */
820 {
821 ssize_t len;
822 struct lttng_payload_view event_view =
823 lttng_payload_view_from_payload(
824 &event_payload, 0, -1);
825
826 len = lttng_event_create_from_payload(&event_view, &local_event,
827 &local_exclusion, &local_filter_expression,
828 &local_bytecode);
829
830 if (len < 0) {
831 ERR("Failed to create an event from the received buffer");
832 ret_code = LTTNG_ERR_INVALID_PROTOCOL;
833 goto end;
834 }
835
836 if (len != event_len) {
837 ERR("Userspace probe location from the received buffer is not the advertised length: header length = %zu" PRIu32 ", payload length = %zd", event_len, len);
838 ret_code = LTTNG_ERR_INVALID_PROTOCOL;
839 goto end;
840 }
841 }
842
843 *out_event = local_event;
844 *out_exclusion = local_exclusion;
845 *out_filter_expression = local_filter_expression;
846 *out_bytecode = local_bytecode;
847 local_event = NULL;
848 local_exclusion = NULL;
849 local_filter_expression = NULL;
850 local_bytecode = NULL;
851
852 ret_code = LTTNG_OK;
853
854 end:
855 lttng_payload_reset(&event_payload);
856 lttng_event_destroy(local_event);
857 free(local_filter_expression);
858 free(local_bytecode);
859 free(local_exclusion);
860 return ret_code;
861 }
862
863 static enum lttng_error_code receive_lttng_event_context(
864 const struct command_ctx *cmd_ctx,
865 int sock,
866 int *sock_error,
867 struct lttng_event_context **out_event_context)
868 {
869 int ret;
870 const size_t event_context_len =
871 (size_t) cmd_ctx->lsm.u.context.length;
872 ssize_t sock_recv_len;
873 enum lttng_error_code ret_code;
874 struct lttng_payload event_context_payload;
875 struct lttng_event_context *context = NULL;
876
877 lttng_payload_init(&event_context_payload);
878
879 ret = lttng_dynamic_buffer_set_size(&event_context_payload.buffer,
880 event_context_len);
881 if (ret) {
882 ret_code = LTTNG_ERR_NOMEM;
883 goto end;
884 }
885
886 sock_recv_len = lttcomm_recv_unix_sock(
887 sock, event_context_payload.buffer.data,
888 event_context_len);
889 if (sock_recv_len < 0 || sock_recv_len != event_context_len) {
890 ERR("Failed to receive event context in command payload");
891 *sock_error = 1;
892 ret_code = LTTNG_ERR_INVALID_PROTOCOL;
893 goto end;
894 }
895
896 /* Deserialize event. */
897 {
898 ssize_t len;
899 struct lttng_payload_view event_context_view =
900 lttng_payload_view_from_payload(
901 &event_context_payload, 0, -1);
902
903 len = lttng_event_context_create_from_payload(
904 &event_context_view, &context);
905
906 if (len < 0) {
907 ERR("Failed to create a event context from the received buffer");
908 ret_code = LTTNG_ERR_INVALID_PROTOCOL;
909 goto end;
910 }
911
912 if (len != event_context_len) {
913 ERR("Event context from the received buffer is not the advertised length: expected length = %zu, payload length = %zd", event_context_len, len);
914 ret_code = LTTNG_ERR_INVALID_PROTOCOL;
915 goto end;
916 }
917 }
918
919 *out_event_context = context;
920 context = NULL;
921 ret_code = LTTNG_OK;
922
923 end:
924 lttng_event_context_destroy(context);
925 lttng_payload_reset(&event_context_payload);
926 return ret_code;
927 }
928
929 /*
930 * Version of setup_lttng_msg() without command header.
931 */
932 static int setup_lttng_msg_no_cmd_header(struct command_ctx *cmd_ctx,
933 void *payload_buf, size_t payload_len)
934 {
935 return setup_lttng_msg(cmd_ctx, payload_buf, payload_len, NULL, 0);
936 }
937
938 /*
939 * Check if the current kernel tracer supports the session rotation feature.
940 * Return 1 if it does, 0 otherwise.
941 */
942 static int check_rotate_compatible(void)
943 {
944 int ret = 1;
945
946 if (the_kernel_tracer_version.major != 2 ||
947 the_kernel_tracer_version.minor < 11) {
948 DBG("Kernel tracer version is not compatible with the rotation feature");
949 ret = 0;
950 }
951
952 return ret;
953 }
954
955 /*
956 * Send data on a unix socket using the liblttsessiondcomm API.
957 *
958 * Return lttcomm error code.
959 */
960 static int send_unix_sock(int sock, struct lttng_payload_view *view)
961 {
962 int ret;
963 const int fd_count = lttng_payload_view_get_fd_handle_count(view);
964
965 /* Check valid length */
966 if (view->buffer.size == 0) {
967 ret = -1;
968 goto end;
969 }
970
971 ret = lttcomm_send_unix_sock(
972 sock, view->buffer.data, view->buffer.size);
973 if (ret < 0) {
974 goto end;
975 }
976
977 if (fd_count > 0) {
978 ret = lttcomm_send_payload_view_fds_unix_sock(sock, view);
979 if (ret < 0) {
980 goto end;
981 }
982 }
983
984 end:
985 return ret;
986 }
987
988 /*
989 * Process the command requested by the lttng client within the command
990 * context structure. This function make sure that the return structure (llm)
991 * is set and ready for transmission before returning.
992 *
993 * Return any error encountered or 0 for success.
994 *
995 * "sock" is only used for special-case var. len data.
996 * A command may assume the ownership of the socket, in which case its value
997 * should be set to -1.
998 *
999 * Should *NOT* be called with RCU read-side lock held.
1000 */
1001 static int process_client_msg(struct command_ctx *cmd_ctx, int *sock,
1002 int *sock_error)
1003 {
1004 int ret = LTTNG_OK;
1005 bool need_tracing_session = true;
1006 bool need_domain;
1007 bool need_consumerd;
1008
1009 DBG("Processing client command '%s\' (%d)",
1010 lttcomm_sessiond_command_str(cmd_ctx->lsm.cmd_type),
1011 cmd_ctx->lsm.cmd_type);
1012
1013 assert(!rcu_read_ongoing());
1014
1015 *sock_error = 0;
1016
1017 switch (cmd_ctx->lsm.cmd_type) {
1018 case LTTNG_CREATE_SESSION_EXT:
1019 case LTTNG_DESTROY_SESSION:
1020 case LTTNG_LIST_SESSIONS:
1021 case LTTNG_LIST_DOMAINS:
1022 case LTTNG_START_TRACE:
1023 case LTTNG_STOP_TRACE:
1024 case LTTNG_DATA_PENDING:
1025 case LTTNG_SNAPSHOT_ADD_OUTPUT:
1026 case LTTNG_SNAPSHOT_DEL_OUTPUT:
1027 case LTTNG_SNAPSHOT_LIST_OUTPUT:
1028 case LTTNG_SNAPSHOT_RECORD:
1029 case LTTNG_SAVE_SESSION:
1030 case LTTNG_SET_SESSION_SHM_PATH:
1031 case LTTNG_REGENERATE_METADATA:
1032 case LTTNG_REGENERATE_STATEDUMP:
1033 case LTTNG_ROTATE_SESSION:
1034 case LTTNG_ROTATION_GET_INFO:
1035 case LTTNG_ROTATION_SET_SCHEDULE:
1036 case LTTNG_SESSION_LIST_ROTATION_SCHEDULES:
1037 case LTTNG_CLEAR_SESSION:
1038 case LTTNG_LIST_TRIGGERS:
1039 case LTTNG_EXECUTE_ERROR_QUERY:
1040 need_domain = false;
1041 break;
1042 default:
1043 need_domain = true;
1044 }
1045
1046 /* Needs a functioning consumerd? */
1047 switch (cmd_ctx->lsm.cmd_type) {
1048 case LTTNG_REGISTER_TRIGGER:
1049 case LTTNG_UNREGISTER_TRIGGER:
1050 case LTTNG_EXECUTE_ERROR_QUERY:
1051 need_consumerd = false;
1052 break;
1053 default:
1054 need_consumerd = true;
1055 break;
1056 }
1057
1058 if (the_config.no_kernel && need_domain &&
1059 cmd_ctx->lsm.domain.type == LTTNG_DOMAIN_KERNEL) {
1060 if (!is_root) {
1061 ret = LTTNG_ERR_NEED_ROOT_SESSIOND;
1062 } else {
1063 ret = LTTNG_ERR_KERN_NA;
1064 }
1065 goto error;
1066 }
1067
1068 /* Deny register consumer if we already have a spawned consumer. */
1069 if (cmd_ctx->lsm.cmd_type == LTTNG_REGISTER_CONSUMER) {
1070 pthread_mutex_lock(&the_kconsumer_data.pid_mutex);
1071 if (the_kconsumer_data.pid > 0) {
1072 ret = LTTNG_ERR_KERN_CONSUMER_FAIL;
1073 pthread_mutex_unlock(&the_kconsumer_data.pid_mutex);
1074 goto error;
1075 }
1076 pthread_mutex_unlock(&the_kconsumer_data.pid_mutex);
1077 }
1078
1079 /*
1080 * Check for command that don't needs to allocate a returned payload. We do
1081 * this here so we don't have to make the call for no payload at each
1082 * command.
1083 */
1084 switch(cmd_ctx->lsm.cmd_type) {
1085 case LTTNG_LIST_SESSIONS:
1086 case LTTNG_LIST_TRACEPOINTS:
1087 case LTTNG_LIST_TRACEPOINT_FIELDS:
1088 case LTTNG_LIST_DOMAINS:
1089 case LTTNG_LIST_CHANNELS:
1090 case LTTNG_LIST_EVENTS:
1091 case LTTNG_LIST_SYSCALLS:
1092 case LTTNG_SESSION_LIST_ROTATION_SCHEDULES:
1093 case LTTNG_PROCESS_ATTR_TRACKER_GET_POLICY:
1094 case LTTNG_PROCESS_ATTR_TRACKER_GET_INCLUSION_SET:
1095 case LTTNG_DATA_PENDING:
1096 case LTTNG_ROTATE_SESSION:
1097 case LTTNG_ROTATION_GET_INFO:
1098 case LTTNG_REGISTER_TRIGGER:
1099 case LTTNG_LIST_TRIGGERS:
1100 case LTTNG_EXECUTE_ERROR_QUERY:
1101 break;
1102 default:
1103 /* Setup lttng message with no payload */
1104 ret = setup_lttng_msg_no_cmd_header(cmd_ctx, NULL, 0);
1105 if (ret < 0) {
1106 /* This label does not try to unlock the session */
1107 goto init_setup_error;
1108 }
1109 }
1110
1111 /* Commands that DO NOT need a session. */
1112 switch (cmd_ctx->lsm.cmd_type) {
1113 case LTTNG_CREATE_SESSION_EXT:
1114 case LTTNG_LIST_SESSIONS:
1115 case LTTNG_LIST_TRACEPOINTS:
1116 case LTTNG_LIST_SYSCALLS:
1117 case LTTNG_LIST_TRACEPOINT_FIELDS:
1118 case LTTNG_SAVE_SESSION:
1119 case LTTNG_REGISTER_TRIGGER:
1120 case LTTNG_UNREGISTER_TRIGGER:
1121 case LTTNG_LIST_TRIGGERS:
1122 case LTTNG_EXECUTE_ERROR_QUERY:
1123 need_tracing_session = false;
1124 break;
1125 default:
1126 DBG("Getting session %s by name", cmd_ctx->lsm.session.name);
1127 /*
1128 * We keep the session list lock across _all_ commands
1129 * for now, because the per-session lock does not
1130 * handle teardown properly.
1131 */
1132 session_lock_list();
1133 cmd_ctx->session = session_find_by_name(cmd_ctx->lsm.session.name);
1134 if (cmd_ctx->session == NULL) {
1135 ret = LTTNG_ERR_SESS_NOT_FOUND;
1136 goto error;
1137 } else {
1138 /* Acquire lock for the session */
1139 session_lock(cmd_ctx->session);
1140 }
1141 break;
1142 }
1143
1144 /*
1145 * Commands that need a valid session but should NOT create one if none
1146 * exists. Instead of creating one and destroying it when the command is
1147 * handled, process that right before so we save some round trip in useless
1148 * code path.
1149 */
1150 switch (cmd_ctx->lsm.cmd_type) {
1151 case LTTNG_DISABLE_CHANNEL:
1152 case LTTNG_DISABLE_EVENT:
1153 switch (cmd_ctx->lsm.domain.type) {
1154 case LTTNG_DOMAIN_KERNEL:
1155 if (!cmd_ctx->session->kernel_session) {
1156 ret = LTTNG_ERR_NO_CHANNEL;
1157 goto error;
1158 }
1159 break;
1160 case LTTNG_DOMAIN_JUL:
1161 case LTTNG_DOMAIN_LOG4J:
1162 case LTTNG_DOMAIN_PYTHON:
1163 case LTTNG_DOMAIN_UST:
1164 if (!cmd_ctx->session->ust_session) {
1165 ret = LTTNG_ERR_NO_CHANNEL;
1166 goto error;
1167 }
1168 break;
1169 default:
1170 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
1171 goto error;
1172 }
1173 default:
1174 break;
1175 }
1176
1177 if (!need_domain) {
1178 goto skip_domain;
1179 }
1180
1181 /*
1182 * Check domain type for specific "pre-action".
1183 */
1184 switch (cmd_ctx->lsm.domain.type) {
1185 case LTTNG_DOMAIN_KERNEL:
1186 if (!is_root) {
1187 ret = LTTNG_ERR_NEED_ROOT_SESSIOND;
1188 goto error;
1189 }
1190
1191 /* Kernel tracer check */
1192 if (!kernel_tracer_is_initialized()) {
1193 /* Basically, load kernel tracer modules */
1194 ret = init_kernel_tracer();
1195 if (ret != 0) {
1196 goto error;
1197 }
1198 }
1199
1200 /* Consumer is in an ERROR state. Report back to client */
1201 if (need_consumerd && uatomic_read(&the_kernel_consumerd_state) ==
1202 CONSUMER_ERROR) {
1203 ret = LTTNG_ERR_NO_KERNCONSUMERD;
1204 goto error;
1205 }
1206
1207 /* Need a session for kernel command */
1208 if (need_tracing_session) {
1209 if (cmd_ctx->session->kernel_session == NULL) {
1210 ret = create_kernel_session(cmd_ctx->session);
1211 if (ret != LTTNG_OK) {
1212 ret = LTTNG_ERR_KERN_SESS_FAIL;
1213 goto error;
1214 }
1215 }
1216
1217 /* Start the kernel consumer daemon */
1218 pthread_mutex_lock(&the_kconsumer_data.pid_mutex);
1219 if (the_kconsumer_data.pid == 0 &&
1220 cmd_ctx->lsm.cmd_type != LTTNG_REGISTER_CONSUMER) {
1221 pthread_mutex_unlock(&the_kconsumer_data.pid_mutex);
1222 ret = start_consumerd(&the_kconsumer_data);
1223 if (ret < 0) {
1224 ret = LTTNG_ERR_KERN_CONSUMER_FAIL;
1225 goto error;
1226 }
1227 uatomic_set(&the_kernel_consumerd_state, CONSUMER_STARTED);
1228 } else {
1229 pthread_mutex_unlock(&the_kconsumer_data.pid_mutex);
1230 }
1231
1232 /*
1233 * The consumer was just spawned so we need to add the socket to
1234 * the consumer output of the session if exist.
1235 */
1236 ret = consumer_create_socket(&the_kconsumer_data,
1237 cmd_ctx->session->kernel_session->consumer);
1238 if (ret < 0) {
1239 goto error;
1240 }
1241 }
1242
1243 break;
1244 case LTTNG_DOMAIN_JUL:
1245 case LTTNG_DOMAIN_LOG4J:
1246 case LTTNG_DOMAIN_PYTHON:
1247 if (!agent_tracing_is_enabled()) {
1248 ret = LTTNG_ERR_AGENT_TRACING_DISABLED;
1249 goto error;
1250 }
1251 /* Fallthrough */
1252 case LTTNG_DOMAIN_UST:
1253 {
1254 if (!ust_app_supported()) {
1255 ret = LTTNG_ERR_NO_UST;
1256 goto error;
1257 }
1258
1259 /* Consumer is in an ERROR state. Report back to client */
1260 if (need_consumerd &&
1261 uatomic_read(&the_ust_consumerd_state) ==
1262 CONSUMER_ERROR) {
1263 ret = LTTNG_ERR_NO_USTCONSUMERD;
1264 goto error;
1265 }
1266
1267 if (need_tracing_session) {
1268 /* Create UST session if none exist. */
1269 if (cmd_ctx->session->ust_session == NULL) {
1270 ret = create_ust_session(cmd_ctx->session,
1271 ALIGNED_CONST_PTR(cmd_ctx->lsm.domain));
1272 if (ret != LTTNG_OK) {
1273 goto error;
1274 }
1275 }
1276
1277 /* Start the UST consumer daemons */
1278 /* 64-bit */
1279 pthread_mutex_lock(&the_ustconsumer64_data.pid_mutex);
1280 if (the_config.consumerd64_bin_path.value &&
1281 the_ustconsumer64_data.pid == 0 &&
1282 cmd_ctx->lsm.cmd_type != LTTNG_REGISTER_CONSUMER) {
1283 pthread_mutex_unlock(&the_ustconsumer64_data.pid_mutex);
1284 ret = start_consumerd(&the_ustconsumer64_data);
1285 if (ret < 0) {
1286 ret = LTTNG_ERR_UST_CONSUMER64_FAIL;
1287 uatomic_set(&the_ust_consumerd64_fd, -EINVAL);
1288 goto error;
1289 }
1290
1291 uatomic_set(&the_ust_consumerd64_fd, the_ustconsumer64_data.cmd_sock);
1292 uatomic_set(&the_ust_consumerd_state, CONSUMER_STARTED);
1293 } else {
1294 pthread_mutex_unlock(&the_ustconsumer64_data.pid_mutex);
1295 }
1296
1297 /*
1298 * Setup socket for consumer 64 bit. No need for atomic access
1299 * since it was set above and can ONLY be set in this thread.
1300 */
1301 ret = consumer_create_socket(&the_ustconsumer64_data,
1302 cmd_ctx->session->ust_session->consumer);
1303 if (ret < 0) {
1304 goto error;
1305 }
1306
1307 /* 32-bit */
1308 pthread_mutex_lock(&the_ustconsumer32_data.pid_mutex);
1309 if (the_config.consumerd32_bin_path.value &&
1310 the_ustconsumer32_data.pid == 0 &&
1311 cmd_ctx->lsm.cmd_type != LTTNG_REGISTER_CONSUMER) {
1312 pthread_mutex_unlock(&the_ustconsumer32_data.pid_mutex);
1313 ret = start_consumerd(&the_ustconsumer32_data);
1314 if (ret < 0) {
1315 ret = LTTNG_ERR_UST_CONSUMER32_FAIL;
1316 uatomic_set(&the_ust_consumerd32_fd, -EINVAL);
1317 goto error;
1318 }
1319
1320 uatomic_set(&the_ust_consumerd32_fd, the_ustconsumer32_data.cmd_sock);
1321 uatomic_set(&the_ust_consumerd_state, CONSUMER_STARTED);
1322 } else {
1323 pthread_mutex_unlock(&the_ustconsumer32_data.pid_mutex);
1324 }
1325
1326 /*
1327 * Setup socket for consumer 32 bit. No need for atomic access
1328 * since it was set above and can ONLY be set in this thread.
1329 */
1330 ret = consumer_create_socket(&the_ustconsumer32_data,
1331 cmd_ctx->session->ust_session->consumer);
1332 if (ret < 0) {
1333 goto error;
1334 }
1335 }
1336 break;
1337 }
1338 default:
1339 break;
1340 }
1341 skip_domain:
1342
1343 /* Validate consumer daemon state when start/stop trace command */
1344 if (cmd_ctx->lsm.cmd_type == LTTNG_START_TRACE ||
1345 cmd_ctx->lsm.cmd_type == LTTNG_STOP_TRACE) {
1346 switch (cmd_ctx->lsm.domain.type) {
1347 case LTTNG_DOMAIN_NONE:
1348 break;
1349 case LTTNG_DOMAIN_JUL:
1350 case LTTNG_DOMAIN_LOG4J:
1351 case LTTNG_DOMAIN_PYTHON:
1352 case LTTNG_DOMAIN_UST:
1353 if (uatomic_read(&the_ust_consumerd_state) != CONSUMER_STARTED) {
1354 ret = LTTNG_ERR_NO_USTCONSUMERD;
1355 goto error;
1356 }
1357 break;
1358 case LTTNG_DOMAIN_KERNEL:
1359 if (uatomic_read(&the_kernel_consumerd_state) != CONSUMER_STARTED) {
1360 ret = LTTNG_ERR_NO_KERNCONSUMERD;
1361 goto error;
1362 }
1363 break;
1364 default:
1365 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
1366 goto error;
1367 }
1368 }
1369
1370 /*
1371 * Check that the UID matches that of the tracing session.
1372 * The root user can interact with all sessions.
1373 */
1374 if (need_tracing_session) {
1375 if (!session_access_ok(cmd_ctx->session,
1376 LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds)) ||
1377 cmd_ctx->session->destroyed) {
1378 ret = LTTNG_ERR_EPERM;
1379 goto error;
1380 }
1381 }
1382
1383 /*
1384 * Send relayd information to consumer as soon as we have a domain and a
1385 * session defined.
1386 */
1387 if (cmd_ctx->session && need_domain) {
1388 /*
1389 * Setup relayd if not done yet. If the relayd information was already
1390 * sent to the consumer, this call will gracefully return.
1391 */
1392 ret = cmd_setup_relayd(cmd_ctx->session);
1393 if (ret != LTTNG_OK) {
1394 goto error;
1395 }
1396 }
1397
1398 /* Process by command type */
1399 switch (cmd_ctx->lsm.cmd_type) {
1400 case LTTNG_ADD_CONTEXT:
1401 {
1402 struct lttng_event_context *event_context = NULL;
1403 const enum lttng_error_code ret_code =
1404 receive_lttng_event_context(
1405 cmd_ctx, *sock, sock_error, &event_context);
1406
1407 if (ret_code != LTTNG_OK) {
1408 ret = (int) ret_code;
1409 goto error;
1410 }
1411
1412 ret = cmd_add_context(cmd_ctx, event_context, the_kernel_poll_pipe[1]);
1413 lttng_event_context_destroy(event_context);
1414 break;
1415 }
1416 case LTTNG_DISABLE_CHANNEL:
1417 {
1418 ret = cmd_disable_channel(cmd_ctx->session, cmd_ctx->lsm.domain.type,
1419 cmd_ctx->lsm.u.disable.channel_name);
1420 break;
1421 }
1422 case LTTNG_ENABLE_CHANNEL:
1423 {
1424 ret = cmd_enable_channel(
1425 cmd_ctx, *sock, the_kernel_poll_pipe[1]);
1426 break;
1427 }
1428 case LTTNG_PROCESS_ATTR_TRACKER_ADD_INCLUDE_VALUE:
1429 case LTTNG_PROCESS_ATTR_TRACKER_REMOVE_INCLUDE_VALUE:
1430 {
1431 struct lttng_dynamic_buffer payload;
1432 struct lttng_buffer_view payload_view;
1433 const bool add_value =
1434 cmd_ctx->lsm.cmd_type ==
1435 LTTNG_PROCESS_ATTR_TRACKER_ADD_INCLUDE_VALUE;
1436 const size_t name_len =
1437 cmd_ctx->lsm.u.process_attr_tracker_add_remove_include_value
1438 .name_len;
1439 const enum lttng_domain_type domain_type =
1440 (enum lttng_domain_type)
1441 cmd_ctx->lsm.domain.type;
1442 const enum lttng_process_attr process_attr =
1443 (enum lttng_process_attr) cmd_ctx->lsm.u
1444 .process_attr_tracker_add_remove_include_value
1445 .process_attr;
1446 const enum lttng_process_attr_value_type value_type =
1447 (enum lttng_process_attr_value_type) cmd_ctx
1448 ->lsm.u
1449 .process_attr_tracker_add_remove_include_value
1450 .value_type;
1451 struct process_attr_value *value;
1452 enum lttng_error_code ret_code;
1453 long login_name_max;
1454
1455 login_name_max = sysconf(_SC_LOGIN_NAME_MAX);
1456 if (login_name_max < 0) {
1457 PERROR("Failed to get _SC_LOGIN_NAME_MAX system configuration");
1458 ret = LTTNG_ERR_INVALID;
1459 goto error;
1460 }
1461
1462 /* Receive remaining variable length payload if applicable. */
1463 if (name_len > login_name_max) {
1464 /*
1465 * POSIX mandates user and group names that are at least
1466 * 8 characters long. Note that although shadow-utils
1467 * (useradd, groupaadd, etc.) use 32 chars as their
1468 * limit (from bits/utmp.h, UT_NAMESIZE),
1469 * LOGIN_NAME_MAX is defined to 256.
1470 */
1471 ERR("Rejecting process attribute tracker value %s as the provided exceeds the maximal allowed length: argument length = %zu, maximal length = %ld",
1472 add_value ? "addition" : "removal",
1473 name_len, login_name_max);
1474 ret = LTTNG_ERR_INVALID;
1475 goto error;
1476 }
1477
1478 lttng_dynamic_buffer_init(&payload);
1479 if (name_len != 0) {
1480 /*
1481 * Receive variable payload for user/group name
1482 * arguments.
1483 */
1484 ret = lttng_dynamic_buffer_set_size(&payload, name_len);
1485 if (ret) {
1486 ERR("Failed to allocate buffer to receive payload of %s process attribute tracker value argument",
1487 add_value ? "add" : "remove");
1488 ret = LTTNG_ERR_NOMEM;
1489 goto error_add_remove_tracker_value;
1490 }
1491
1492 ret = lttcomm_recv_unix_sock(
1493 *sock, payload.data, name_len);
1494 if (ret <= 0) {
1495 ERR("Failed to receive payload of %s process attribute tracker value argument",
1496 add_value ? "add" : "remove");
1497 *sock_error = 1;
1498 ret = LTTNG_ERR_INVALID_PROTOCOL;
1499 goto error_add_remove_tracker_value;
1500 }
1501 }
1502
1503 payload_view = lttng_buffer_view_from_dynamic_buffer(
1504 &payload, 0, name_len);
1505 if (name_len > 0 && !lttng_buffer_view_is_valid(&payload_view)) {
1506 ret = LTTNG_ERR_INVALID_PROTOCOL;
1507 goto error_add_remove_tracker_value;
1508 }
1509
1510 /*
1511 * Validate the value type and domains are legal for the process
1512 * attribute tracker that is specified and convert the value to
1513 * add/remove to the internal sessiond representation.
1514 */
1515 ret_code = process_attr_value_from_comm(domain_type,
1516 process_attr, value_type,
1517 &cmd_ctx->lsm.u.process_attr_tracker_add_remove_include_value
1518 .integral_value,
1519 &payload_view, &value);
1520 if (ret_code != LTTNG_OK) {
1521 ret = ret_code;
1522 goto error_add_remove_tracker_value;
1523 }
1524
1525 if (add_value) {
1526 ret = cmd_process_attr_tracker_inclusion_set_add_value(
1527 cmd_ctx->session, domain_type,
1528 process_attr, value);
1529 } else {
1530 ret = cmd_process_attr_tracker_inclusion_set_remove_value(
1531 cmd_ctx->session, domain_type,
1532 process_attr, value);
1533 }
1534 process_attr_value_destroy(value);
1535 error_add_remove_tracker_value:
1536 lttng_dynamic_buffer_reset(&payload);
1537 break;
1538 }
1539 case LTTNG_PROCESS_ATTR_TRACKER_GET_POLICY:
1540 {
1541 enum lttng_tracking_policy tracking_policy;
1542 const enum lttng_domain_type domain_type =
1543 (enum lttng_domain_type)
1544 cmd_ctx->lsm.domain.type;
1545 const enum lttng_process_attr process_attr =
1546 (enum lttng_process_attr) cmd_ctx->lsm.u
1547 .process_attr_tracker_get_tracking_policy
1548 .process_attr;
1549
1550 ret = cmd_process_attr_tracker_get_tracking_policy(
1551 cmd_ctx->session, domain_type, process_attr,
1552 &tracking_policy);
1553 if (ret != LTTNG_OK) {
1554 goto error;
1555 }
1556
1557 ret = setup_lttng_msg_no_cmd_header(cmd_ctx,
1558 &(uint32_t){tracking_policy}, sizeof(uint32_t));
1559 if (ret < 0) {
1560 ret = LTTNG_ERR_NOMEM;
1561 goto error;
1562 }
1563 ret = LTTNG_OK;
1564 break;
1565 }
1566 case LTTNG_PROCESS_ATTR_TRACKER_SET_POLICY:
1567 {
1568 const enum lttng_tracking_policy tracking_policy =
1569 (enum lttng_tracking_policy) cmd_ctx->lsm.u
1570 .process_attr_tracker_set_tracking_policy
1571 .tracking_policy;
1572 const enum lttng_domain_type domain_type =
1573 (enum lttng_domain_type)
1574 cmd_ctx->lsm.domain.type;
1575 const enum lttng_process_attr process_attr =
1576 (enum lttng_process_attr) cmd_ctx->lsm.u
1577 .process_attr_tracker_set_tracking_policy
1578 .process_attr;
1579
1580 ret = cmd_process_attr_tracker_set_tracking_policy(
1581 cmd_ctx->session, domain_type, process_attr,
1582 tracking_policy);
1583 if (ret != LTTNG_OK) {
1584 goto error;
1585 }
1586 break;
1587 }
1588 case LTTNG_PROCESS_ATTR_TRACKER_GET_INCLUSION_SET:
1589 {
1590 struct lttng_process_attr_values *values;
1591 struct lttng_dynamic_buffer reply;
1592 const enum lttng_domain_type domain_type =
1593 (enum lttng_domain_type)
1594 cmd_ctx->lsm.domain.type;
1595 const enum lttng_process_attr process_attr =
1596 (enum lttng_process_attr) cmd_ctx->lsm.u
1597 .process_attr_tracker_get_inclusion_set
1598 .process_attr;
1599
1600 ret = cmd_process_attr_tracker_get_inclusion_set(
1601 cmd_ctx->session, domain_type, process_attr,
1602 &values);
1603 if (ret != LTTNG_OK) {
1604 goto error;
1605 }
1606
1607 lttng_dynamic_buffer_init(&reply);
1608 ret = lttng_process_attr_values_serialize(values, &reply);
1609 if (ret < 0) {
1610 goto error_tracker_get_inclusion_set;
1611 }
1612
1613 ret = setup_lttng_msg_no_cmd_header(
1614 cmd_ctx, reply.data, reply.size);
1615 if (ret < 0) {
1616 ret = LTTNG_ERR_NOMEM;
1617 goto error_tracker_get_inclusion_set;
1618 }
1619 ret = LTTNG_OK;
1620
1621 error_tracker_get_inclusion_set:
1622 lttng_process_attr_values_destroy(values);
1623 lttng_dynamic_buffer_reset(&reply);
1624 break;
1625 }
1626 case LTTNG_ENABLE_EVENT:
1627 case LTTNG_DISABLE_EVENT:
1628 {
1629 struct lttng_event *event;
1630 char *filter_expression;
1631 struct lttng_event_exclusion *exclusions;
1632 struct lttng_bytecode *bytecode;
1633 const enum lttng_error_code ret_code = receive_lttng_event(
1634 cmd_ctx, *sock, sock_error, &event,
1635 &filter_expression, &bytecode, &exclusions);
1636
1637 if (ret_code != LTTNG_OK) {
1638 ret = (int) ret_code;
1639 goto error;
1640 }
1641
1642 /*
1643 * Ownership of filter_expression, exclusions, and bytecode is
1644 * always transferred.
1645 */
1646 ret = cmd_ctx->lsm.cmd_type == LTTNG_ENABLE_EVENT ?
1647 cmd_enable_event(cmd_ctx, event,
1648 filter_expression, exclusions,
1649 bytecode,
1650 the_kernel_poll_pipe[1]) :
1651 cmd_disable_event(cmd_ctx, event,
1652 filter_expression, bytecode,
1653 exclusions);
1654 lttng_event_destroy(event);
1655 break;
1656 }
1657 case LTTNG_LIST_TRACEPOINTS:
1658 {
1659 enum lttng_error_code ret_code;
1660 size_t original_payload_size;
1661 size_t payload_size;
1662 const size_t command_header_size = sizeof(struct lttcomm_list_command_header);
1663
1664 ret = setup_empty_lttng_msg(cmd_ctx);
1665 if (ret) {
1666 ret = LTTNG_ERR_NOMEM;
1667 goto setup_error;
1668 }
1669
1670 original_payload_size = cmd_ctx->reply_payload.buffer.size;
1671
1672 session_lock_list();
1673 ret_code = cmd_list_tracepoints(cmd_ctx->lsm.domain.type,
1674 &cmd_ctx->reply_payload);
1675 session_unlock_list();
1676 if (ret_code != LTTNG_OK) {
1677 ret = (int) ret_code;
1678 goto error;
1679 }
1680
1681 payload_size = cmd_ctx->reply_payload.buffer.size -
1682 command_header_size - original_payload_size;
1683 update_lttng_msg(cmd_ctx, command_header_size, payload_size);
1684
1685 ret = LTTNG_OK;
1686 break;
1687 }
1688 case LTTNG_LIST_TRACEPOINT_FIELDS:
1689 {
1690 enum lttng_error_code ret_code;
1691 size_t original_payload_size;
1692 size_t payload_size;
1693 const size_t command_header_size = sizeof(struct lttcomm_list_command_header);
1694
1695 ret = setup_empty_lttng_msg(cmd_ctx);
1696 if (ret) {
1697 ret = LTTNG_ERR_NOMEM;
1698 goto setup_error;
1699 }
1700
1701 original_payload_size = cmd_ctx->reply_payload.buffer.size;
1702
1703 session_lock_list();
1704 ret_code = cmd_list_tracepoint_fields(
1705 cmd_ctx->lsm.domain.type, &cmd_ctx->reply_payload);
1706 session_unlock_list();
1707 if (ret_code != LTTNG_OK) {
1708 ret = (int) ret_code;
1709 goto error;
1710 }
1711
1712 payload_size = cmd_ctx->reply_payload.buffer.size -
1713 command_header_size - original_payload_size;
1714 update_lttng_msg(cmd_ctx, command_header_size, payload_size);
1715
1716 ret = LTTNG_OK;
1717 break;
1718 }
1719 case LTTNG_LIST_SYSCALLS:
1720 {
1721 enum lttng_error_code ret_code;
1722 size_t original_payload_size;
1723 size_t payload_size;
1724 const size_t command_header_size = sizeof(struct lttcomm_list_command_header);
1725
1726 ret = setup_empty_lttng_msg(cmd_ctx);
1727 if (ret) {
1728 ret = LTTNG_ERR_NOMEM;
1729 goto setup_error;
1730 }
1731
1732 original_payload_size = cmd_ctx->reply_payload.buffer.size;
1733
1734 ret_code = cmd_list_syscalls(&cmd_ctx->reply_payload);
1735 if (ret_code != LTTNG_OK) {
1736 ret = (int) ret_code;
1737 goto error;
1738 }
1739
1740 payload_size = cmd_ctx->reply_payload.buffer.size -
1741 command_header_size - original_payload_size;
1742 update_lttng_msg(cmd_ctx, command_header_size, payload_size);
1743
1744 ret = LTTNG_OK;
1745 break;
1746 }
1747 case LTTNG_SET_CONSUMER_URI:
1748 {
1749 size_t nb_uri, len;
1750 struct lttng_uri *uris;
1751
1752 nb_uri = cmd_ctx->lsm.u.uri.size;
1753 len = nb_uri * sizeof(struct lttng_uri);
1754
1755 if (nb_uri == 0) {
1756 ret = LTTNG_ERR_INVALID;
1757 goto error;
1758 }
1759
1760 uris = zmalloc(len);
1761 if (uris == NULL) {
1762 ret = LTTNG_ERR_FATAL;
1763 goto error;
1764 }
1765
1766 /* Receive variable len data */
1767 DBG("Receiving %zu URI(s) from client ...", nb_uri);
1768 ret = lttcomm_recv_unix_sock(*sock, uris, len);
1769 if (ret <= 0) {
1770 DBG("No URIs received from client... continuing");
1771 *sock_error = 1;
1772 ret = LTTNG_ERR_SESSION_FAIL;
1773 free(uris);
1774 goto error;
1775 }
1776
1777 ret = cmd_set_consumer_uri(cmd_ctx->session, nb_uri, uris);
1778 free(uris);
1779 if (ret != LTTNG_OK) {
1780 goto error;
1781 }
1782
1783
1784 break;
1785 }
1786 case LTTNG_START_TRACE:
1787 {
1788 /*
1789 * On the first start, if we have a kernel session and we have
1790 * enabled time or size-based rotations, we have to make sure
1791 * the kernel tracer supports it.
1792 */
1793 if (!cmd_ctx->session->has_been_started && \
1794 cmd_ctx->session->kernel_session && \
1795 (cmd_ctx->session->rotate_timer_period || \
1796 cmd_ctx->session->rotate_size) && \
1797 !check_rotate_compatible()) {
1798 DBG("Kernel tracer version is not compatible with the rotation feature");
1799 ret = LTTNG_ERR_ROTATION_WRONG_VERSION;
1800 goto error;
1801 }
1802 ret = cmd_start_trace(cmd_ctx->session);
1803 break;
1804 }
1805 case LTTNG_STOP_TRACE:
1806 {
1807 ret = cmd_stop_trace(cmd_ctx->session);
1808 break;
1809 }
1810 case LTTNG_DESTROY_SESSION:
1811 {
1812 ret = cmd_destroy_session(cmd_ctx->session,
1813 the_notification_thread_handle, sock);
1814 break;
1815 }
1816 case LTTNG_LIST_DOMAINS:
1817 {
1818 ssize_t nb_dom;
1819 struct lttng_domain *domains = NULL;
1820
1821 nb_dom = cmd_list_domains(cmd_ctx->session, &domains);
1822 if (nb_dom < 0) {
1823 /* Return value is a negative lttng_error_code. */
1824 ret = -nb_dom;
1825 goto error;
1826 }
1827
1828 ret = setup_lttng_msg_no_cmd_header(cmd_ctx, domains,
1829 nb_dom * sizeof(struct lttng_domain));
1830 free(domains);
1831
1832 if (ret < 0) {
1833 goto setup_error;
1834 }
1835
1836 ret = LTTNG_OK;
1837 break;
1838 }
1839 case LTTNG_LIST_CHANNELS:
1840 {
1841 enum lttng_error_code ret_code;
1842 size_t original_payload_size;
1843 size_t payload_size;
1844 const size_t command_header_size = sizeof(struct lttcomm_list_command_header);
1845
1846 ret = setup_empty_lttng_msg(cmd_ctx);
1847 if (ret) {
1848 ret = LTTNG_ERR_NOMEM;
1849 goto setup_error;
1850 }
1851
1852 original_payload_size = cmd_ctx->reply_payload.buffer.size;
1853
1854 ret_code = cmd_list_channels(cmd_ctx->lsm.domain.type,
1855 cmd_ctx->session, &cmd_ctx->reply_payload);
1856 if (ret_code != LTTNG_OK) {
1857 ret = (int) ret_code;
1858 goto error;
1859 }
1860
1861 payload_size = cmd_ctx->reply_payload.buffer.size -
1862 command_header_size - original_payload_size;
1863 update_lttng_msg(cmd_ctx, command_header_size, payload_size);
1864
1865 ret = LTTNG_OK;
1866 break;
1867 }
1868 case LTTNG_LIST_EVENTS:
1869 {
1870 enum lttng_error_code ret_code;
1871 size_t original_payload_size;
1872 size_t payload_size;
1873 const size_t command_header_size = sizeof(struct lttcomm_list_command_header);
1874
1875 ret = setup_empty_lttng_msg(cmd_ctx);
1876 if (ret) {
1877 ret = LTTNG_ERR_NOMEM;
1878 goto setup_error;
1879 }
1880
1881 original_payload_size = cmd_ctx->reply_payload.buffer.size;
1882
1883 ret_code = cmd_list_events(cmd_ctx->lsm.domain.type,
1884 cmd_ctx->session,
1885 cmd_ctx->lsm.u.list.channel_name, &cmd_ctx->reply_payload);
1886 if (ret_code != LTTNG_OK) {
1887 ret = (int) ret_code;
1888 goto error;
1889 }
1890
1891 payload_size = cmd_ctx->reply_payload.buffer.size -
1892 command_header_size - original_payload_size;
1893 update_lttng_msg(cmd_ctx, command_header_size, payload_size);
1894
1895 ret = LTTNG_OK;
1896 break;
1897 }
1898 case LTTNG_LIST_SESSIONS:
1899 {
1900 unsigned int nr_sessions;
1901 void *sessions_payload;
1902 size_t payload_len;
1903
1904 session_lock_list();
1905 nr_sessions = lttng_sessions_count(
1906 LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds),
1907 LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds));
1908
1909 payload_len = (sizeof(struct lttng_session) * nr_sessions) +
1910 (sizeof(struct lttng_session_extended) * nr_sessions);
1911 sessions_payload = zmalloc(payload_len);
1912
1913 if (!sessions_payload) {
1914 session_unlock_list();
1915 ret = -ENOMEM;
1916 goto setup_error;
1917 }
1918
1919 cmd_list_lttng_sessions(sessions_payload, nr_sessions,
1920 LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds),
1921 LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds));
1922 session_unlock_list();
1923
1924 ret = setup_lttng_msg_no_cmd_header(cmd_ctx, sessions_payload,
1925 payload_len);
1926 free(sessions_payload);
1927
1928 if (ret < 0) {
1929 goto setup_error;
1930 }
1931
1932 ret = LTTNG_OK;
1933 break;
1934 }
1935 case LTTNG_REGISTER_CONSUMER:
1936 {
1937 struct consumer_data *cdata;
1938
1939 switch (cmd_ctx->lsm.domain.type) {
1940 case LTTNG_DOMAIN_KERNEL:
1941 cdata = &the_kconsumer_data;
1942 break;
1943 default:
1944 ret = LTTNG_ERR_UND;
1945 goto error;
1946 }
1947
1948 ret = cmd_register_consumer(cmd_ctx->session, cmd_ctx->lsm.domain.type,
1949 cmd_ctx->lsm.u.reg.path, cdata);
1950 break;
1951 }
1952 case LTTNG_DATA_PENDING:
1953 {
1954 int pending_ret;
1955 uint8_t pending_ret_byte;
1956
1957 pending_ret = cmd_data_pending(cmd_ctx->session);
1958
1959 /*
1960 * FIXME
1961 *
1962 * This function may returns 0 or 1 to indicate whether or not
1963 * there is data pending. In case of error, it should return an
1964 * LTTNG_ERR code. However, some code paths may still return
1965 * a nondescript error code, which we handle by returning an
1966 * "unknown" error.
1967 */
1968 if (pending_ret == 0 || pending_ret == 1) {
1969 /*
1970 * ret will be set to LTTNG_OK at the end of
1971 * this function.
1972 */
1973 } else if (pending_ret < 0) {
1974 ret = LTTNG_ERR_UNK;
1975 goto setup_error;
1976 } else {
1977 ret = pending_ret;
1978 goto setup_error;
1979 }
1980
1981 pending_ret_byte = (uint8_t) pending_ret;
1982
1983 /* 1 byte to return whether or not data is pending */
1984 ret = setup_lttng_msg_no_cmd_header(cmd_ctx,
1985 &pending_ret_byte, 1);
1986
1987 if (ret < 0) {
1988 goto setup_error;
1989 }
1990
1991 ret = LTTNG_OK;
1992 break;
1993 }
1994 case LTTNG_SNAPSHOT_ADD_OUTPUT:
1995 {
1996 uint32_t snapshot_id;
1997 struct lttcomm_lttng_output_id reply;
1998
1999 ret = cmd_snapshot_add_output(cmd_ctx->session,
2000 ALIGNED_CONST_PTR(cmd_ctx->lsm.u.snapshot_output.output),
2001 &snapshot_id);
2002 if (ret != LTTNG_OK) {
2003 goto error;
2004 }
2005 reply.id = snapshot_id;
2006
2007 ret = setup_lttng_msg_no_cmd_header(cmd_ctx, &reply,
2008 sizeof(reply));
2009 if (ret < 0) {
2010 goto setup_error;
2011 }
2012
2013 /* Copy output list into message payload */
2014 ret = LTTNG_OK;
2015 break;
2016 }
2017 case LTTNG_SNAPSHOT_DEL_OUTPUT:
2018 {
2019 ret = cmd_snapshot_del_output(cmd_ctx->session,
2020 ALIGNED_CONST_PTR(cmd_ctx->lsm.u.snapshot_output.output));
2021 break;
2022 }
2023 case LTTNG_SNAPSHOT_LIST_OUTPUT:
2024 {
2025 ssize_t nb_output;
2026 struct lttng_snapshot_output *outputs = NULL;
2027
2028 nb_output = cmd_snapshot_list_outputs(cmd_ctx->session, &outputs);
2029 if (nb_output < 0) {
2030 ret = -nb_output;
2031 goto error;
2032 }
2033
2034 assert((nb_output > 0 && outputs) || nb_output == 0);
2035 ret = setup_lttng_msg_no_cmd_header(cmd_ctx, outputs,
2036 nb_output * sizeof(struct lttng_snapshot_output));
2037 free(outputs);
2038
2039 if (ret < 0) {
2040 goto setup_error;
2041 }
2042
2043 ret = LTTNG_OK;
2044 break;
2045 }
2046 case LTTNG_SNAPSHOT_RECORD:
2047 {
2048 ret = cmd_snapshot_record(cmd_ctx->session,
2049 ALIGNED_CONST_PTR(cmd_ctx->lsm.u.snapshot_record.output),
2050 cmd_ctx->lsm.u.snapshot_record.wait);
2051 break;
2052 }
2053 case LTTNG_CREATE_SESSION_EXT:
2054 {
2055 struct lttng_dynamic_buffer payload;
2056 struct lttng_session_descriptor *return_descriptor = NULL;
2057
2058 lttng_dynamic_buffer_init(&payload);
2059 ret = cmd_create_session(cmd_ctx, *sock, &return_descriptor);
2060 if (ret != LTTNG_OK) {
2061 goto error;
2062 }
2063
2064 ret = lttng_session_descriptor_serialize(return_descriptor,
2065 &payload);
2066 if (ret) {
2067 ERR("Failed to serialize session descriptor in reply to \"create session\" command");
2068 lttng_session_descriptor_destroy(return_descriptor);
2069 ret = LTTNG_ERR_NOMEM;
2070 goto error;
2071 }
2072 ret = setup_lttng_msg_no_cmd_header(cmd_ctx, payload.data,
2073 payload.size);
2074 if (ret) {
2075 lttng_session_descriptor_destroy(return_descriptor);
2076 ret = LTTNG_ERR_NOMEM;
2077 goto error;
2078 }
2079 lttng_dynamic_buffer_reset(&payload);
2080 lttng_session_descriptor_destroy(return_descriptor);
2081 ret = LTTNG_OK;
2082 break;
2083 }
2084 case LTTNG_SAVE_SESSION:
2085 {
2086 ret = cmd_save_sessions(&cmd_ctx->lsm.u.save_session.attr,
2087 &cmd_ctx->creds);
2088 break;
2089 }
2090 case LTTNG_SET_SESSION_SHM_PATH:
2091 {
2092 ret = cmd_set_session_shm_path(cmd_ctx->session,
2093 cmd_ctx->lsm.u.set_shm_path.shm_path);
2094 break;
2095 }
2096 case LTTNG_REGENERATE_METADATA:
2097 {
2098 ret = cmd_regenerate_metadata(cmd_ctx->session);
2099 break;
2100 }
2101 case LTTNG_REGENERATE_STATEDUMP:
2102 {
2103 ret = cmd_regenerate_statedump(cmd_ctx->session);
2104 break;
2105 }
2106 case LTTNG_REGISTER_TRIGGER:
2107 {
2108 struct lttng_trigger *payload_trigger;
2109 struct lttng_trigger *return_trigger;
2110 size_t original_reply_payload_size;
2111 size_t reply_payload_size;
2112 const struct lttng_credentials cmd_creds = {
2113 .uid = LTTNG_OPTIONAL_INIT_VALUE(cmd_ctx->creds.uid),
2114 .gid = LTTNG_OPTIONAL_INIT_VALUE(cmd_ctx->creds.gid),
2115 };
2116
2117 ret = setup_empty_lttng_msg(cmd_ctx);
2118 if (ret) {
2119 ret = LTTNG_ERR_NOMEM;
2120 goto setup_error;
2121 }
2122
2123 ret = receive_lttng_trigger(
2124 cmd_ctx, *sock, sock_error, &payload_trigger);
2125 if (ret != LTTNG_OK) {
2126 goto error;
2127 }
2128
2129 original_reply_payload_size = cmd_ctx->reply_payload.buffer.size;
2130
2131 ret = cmd_register_trigger(&cmd_creds, payload_trigger,
2132 cmd_ctx->lsm.u.trigger.is_trigger_anonymous,
2133 the_notification_thread_handle,
2134 &return_trigger);
2135 if (ret != LTTNG_OK) {
2136 lttng_trigger_put(payload_trigger);
2137 goto error;
2138 }
2139
2140 ret = lttng_trigger_serialize(return_trigger, &cmd_ctx->reply_payload);
2141 lttng_trigger_put(payload_trigger);
2142 lttng_trigger_put(return_trigger);
2143 if (ret) {
2144 ERR("Failed to serialize trigger in reply to \"register trigger\" command");
2145 ret = LTTNG_ERR_NOMEM;
2146 goto error;
2147 }
2148
2149 reply_payload_size = cmd_ctx->reply_payload.buffer.size -
2150 original_reply_payload_size;
2151
2152 update_lttng_msg(cmd_ctx, 0, reply_payload_size);
2153
2154 ret = LTTNG_OK;
2155 break;
2156 }
2157 case LTTNG_UNREGISTER_TRIGGER:
2158 {
2159 struct lttng_trigger *payload_trigger;
2160 const struct lttng_credentials cmd_creds = {
2161 .uid = LTTNG_OPTIONAL_INIT_VALUE(cmd_ctx->creds.uid),
2162 .gid = LTTNG_OPTIONAL_INIT_VALUE(cmd_ctx->creds.gid),
2163 };
2164
2165 ret = receive_lttng_trigger(
2166 cmd_ctx, *sock, sock_error, &payload_trigger);
2167 if (ret != LTTNG_OK) {
2168 goto error;
2169 }
2170
2171 ret = cmd_unregister_trigger(&cmd_creds, payload_trigger,
2172 the_notification_thread_handle);
2173 lttng_trigger_put(payload_trigger);
2174 break;
2175 }
2176 case LTTNG_ROTATE_SESSION:
2177 {
2178 struct lttng_rotate_session_return rotate_return;
2179
2180 DBG("Client rotate session \"%s\"", cmd_ctx->session->name);
2181
2182 memset(&rotate_return, 0, sizeof(rotate_return));
2183 if (cmd_ctx->session->kernel_session && !check_rotate_compatible()) {
2184 DBG("Kernel tracer version is not compatible with the rotation feature");
2185 ret = LTTNG_ERR_ROTATION_WRONG_VERSION;
2186 goto error;
2187 }
2188
2189 ret = cmd_rotate_session(cmd_ctx->session, &rotate_return,
2190 false,
2191 LTTNG_TRACE_CHUNK_COMMAND_TYPE_MOVE_TO_COMPLETED);
2192 if (ret < 0) {
2193 ret = -ret;
2194 goto error;
2195 }
2196
2197 ret = setup_lttng_msg_no_cmd_header(cmd_ctx, &rotate_return,
2198 sizeof(rotate_return));
2199 if (ret < 0) {
2200 ret = -ret;
2201 goto error;
2202 }
2203
2204 ret = LTTNG_OK;
2205 break;
2206 }
2207 case LTTNG_ROTATION_GET_INFO:
2208 {
2209 struct lttng_rotation_get_info_return get_info_return;
2210
2211 memset(&get_info_return, 0, sizeof(get_info_return));
2212 ret = cmd_rotate_get_info(cmd_ctx->session, &get_info_return,
2213 cmd_ctx->lsm.u.get_rotation_info.rotation_id);
2214 if (ret < 0) {
2215 ret = -ret;
2216 goto error;
2217 }
2218
2219 ret = setup_lttng_msg_no_cmd_header(cmd_ctx, &get_info_return,
2220 sizeof(get_info_return));
2221 if (ret < 0) {
2222 ret = -ret;
2223 goto error;
2224 }
2225
2226 ret = LTTNG_OK;
2227 break;
2228 }
2229 case LTTNG_ROTATION_SET_SCHEDULE:
2230 {
2231 bool set_schedule;
2232 enum lttng_rotation_schedule_type schedule_type;
2233 uint64_t value;
2234
2235 if (cmd_ctx->session->kernel_session && !check_rotate_compatible()) {
2236 DBG("Kernel tracer version does not support session rotations");
2237 ret = LTTNG_ERR_ROTATION_WRONG_VERSION;
2238 goto error;
2239 }
2240
2241 set_schedule = cmd_ctx->lsm.u.rotation_set_schedule.set == 1;
2242 schedule_type = (enum lttng_rotation_schedule_type) cmd_ctx->lsm.u.rotation_set_schedule.type;
2243 value = cmd_ctx->lsm.u.rotation_set_schedule.value;
2244
2245 ret = cmd_rotation_set_schedule(cmd_ctx->session, set_schedule,
2246 schedule_type, value,
2247 the_notification_thread_handle);
2248 if (ret != LTTNG_OK) {
2249 goto error;
2250 }
2251
2252 break;
2253 }
2254 case LTTNG_SESSION_LIST_ROTATION_SCHEDULES:
2255 {
2256 struct lttng_session_list_schedules_return schedules = {
2257 .periodic.set = !!cmd_ctx->session->rotate_timer_period,
2258 .periodic.value = cmd_ctx->session->rotate_timer_period,
2259 .size.set = !!cmd_ctx->session->rotate_size,
2260 .size.value = cmd_ctx->session->rotate_size,
2261 };
2262
2263 ret = setup_lttng_msg_no_cmd_header(cmd_ctx, &schedules,
2264 sizeof(schedules));
2265 if (ret < 0) {
2266 ret = -ret;
2267 goto error;
2268 }
2269
2270 ret = LTTNG_OK;
2271 break;
2272 }
2273 case LTTNG_CLEAR_SESSION:
2274 {
2275 ret = cmd_clear_session(cmd_ctx->session, sock);
2276 break;
2277 }
2278 case LTTNG_LIST_TRIGGERS:
2279 {
2280 struct lttng_triggers *return_triggers = NULL;
2281 size_t original_payload_size;
2282 size_t payload_size;
2283
2284 ret = setup_empty_lttng_msg(cmd_ctx);
2285 if (ret) {
2286 ret = LTTNG_ERR_NOMEM;
2287 goto setup_error;
2288 }
2289
2290 original_payload_size = cmd_ctx->reply_payload.buffer.size;
2291
2292 ret = cmd_list_triggers(cmd_ctx, the_notification_thread_handle,
2293 &return_triggers);
2294 if (ret != LTTNG_OK) {
2295 goto error;
2296 }
2297
2298 assert(return_triggers);
2299 ret = lttng_triggers_serialize(
2300 return_triggers, &cmd_ctx->reply_payload);
2301 lttng_triggers_destroy(return_triggers);
2302 if (ret) {
2303 ERR("Failed to serialize triggers in reply to `list triggers` command");
2304 ret = LTTNG_ERR_NOMEM;
2305 goto error;
2306 }
2307
2308 payload_size = cmd_ctx->reply_payload.buffer.size -
2309 original_payload_size;
2310
2311 update_lttng_msg(cmd_ctx, 0, payload_size);
2312
2313 ret = LTTNG_OK;
2314 break;
2315 }
2316 case LTTNG_EXECUTE_ERROR_QUERY:
2317 {
2318 struct lttng_error_query *query;
2319 const struct lttng_credentials cmd_creds = {
2320 .uid = LTTNG_OPTIONAL_INIT_VALUE(cmd_ctx->creds.uid),
2321 .gid = LTTNG_OPTIONAL_INIT_VALUE(cmd_ctx->creds.gid),
2322 };
2323 struct lttng_error_query_results *results = NULL;
2324 size_t original_payload_size;
2325 size_t payload_size;
2326
2327 ret = setup_empty_lttng_msg(cmd_ctx);
2328 if (ret) {
2329 ret = LTTNG_ERR_NOMEM;
2330 goto setup_error;
2331 }
2332
2333 original_payload_size = cmd_ctx->reply_payload.buffer.size;
2334
2335 ret = receive_lttng_error_query(
2336 cmd_ctx, *sock, sock_error, &query);
2337 if (ret != LTTNG_OK) {
2338 goto error;
2339 }
2340
2341 ret = cmd_execute_error_query(&cmd_creds, query, &results,
2342 the_notification_thread_handle);
2343 lttng_error_query_destroy(query);
2344 if (ret != LTTNG_OK) {
2345 goto error;
2346 }
2347
2348 assert(results);
2349 ret = lttng_error_query_results_serialize(
2350 results, &cmd_ctx->reply_payload);
2351 lttng_error_query_results_destroy(results);
2352 if (ret) {
2353 ERR("Failed to serialize error query result set in reply to `execute error query` command");
2354 ret = LTTNG_ERR_NOMEM;
2355 goto error;
2356 }
2357
2358 payload_size = cmd_ctx->reply_payload.buffer.size -
2359 original_payload_size;
2360
2361 update_lttng_msg(cmd_ctx, 0, payload_size);
2362
2363 ret = LTTNG_OK;
2364
2365 break;
2366 }
2367 default:
2368 ret = LTTNG_ERR_UND;
2369 break;
2370 }
2371
2372 error:
2373 if (cmd_ctx->reply_payload.buffer.size == 0) {
2374 DBG("Missing llm header, creating one.");
2375 if (setup_lttng_msg_no_cmd_header(cmd_ctx, NULL, 0) < 0) {
2376 goto setup_error;
2377 }
2378 }
2379 /* Set return code */
2380 ((struct lttcomm_lttng_msg *) (cmd_ctx->reply_payload.buffer.data))->ret_code = ret;
2381 setup_error:
2382 if (cmd_ctx->session) {
2383 session_unlock(cmd_ctx->session);
2384 session_put(cmd_ctx->session);
2385 cmd_ctx->session = NULL;
2386 }
2387 if (need_tracing_session) {
2388 session_unlock_list();
2389 }
2390 init_setup_error:
2391 assert(!rcu_read_ongoing());
2392 return ret;
2393 }
2394
2395 static int create_client_sock(void)
2396 {
2397 int ret, client_sock;
2398
2399 /* Create client tool unix socket */
2400 client_sock = lttcomm_create_unix_sock(
2401 the_config.client_unix_sock_path.value);
2402 if (client_sock < 0) {
2403 ERR("Create unix sock failed: %s",
2404 the_config.client_unix_sock_path.value);
2405 ret = -1;
2406 goto end;
2407 }
2408
2409 /* Set the cloexec flag */
2410 ret = utils_set_fd_cloexec(client_sock);
2411 if (ret < 0) {
2412 ERR("Unable to set CLOEXEC flag to the client Unix socket (fd: %d). "
2413 "Continuing but note that the consumer daemon will have a "
2414 "reference to this socket on exec()", client_sock);
2415 }
2416
2417 /* File permission MUST be 660 */
2418 ret = chmod(the_config.client_unix_sock_path.value,
2419 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
2420 if (ret < 0) {
2421 ERR("Set file permissions failed: %s",
2422 the_config.client_unix_sock_path.value);
2423 PERROR("chmod");
2424 (void) lttcomm_close_unix_sock(client_sock);
2425 ret = -1;
2426 goto end;
2427 }
2428 DBG("Created client socket (fd = %i)", client_sock);
2429 ret = client_sock;
2430 end:
2431 return ret;
2432 }
2433
2434 static void cleanup_client_thread(void *data)
2435 {
2436 struct lttng_pipe *quit_pipe = data;
2437
2438 lttng_pipe_destroy(quit_pipe);
2439 }
2440
2441 static void thread_init_cleanup(void *data)
2442 {
2443 set_thread_status(false);
2444 }
2445
2446 /*
2447 * This thread manage all clients request using the unix client socket for
2448 * communication.
2449 */
2450 static void *thread_manage_clients(void *data)
2451 {
2452 int sock = -1, ret, i, pollfd, err = -1;
2453 int sock_error;
2454 uint32_t revents, nb_fd;
2455 struct lttng_poll_event events;
2456 const int client_sock = thread_state.client_sock;
2457 struct lttng_pipe *quit_pipe = data;
2458 const int thread_quit_pipe_fd = lttng_pipe_get_readfd(quit_pipe);
2459 struct command_ctx cmd_ctx = {};
2460
2461 DBG("[thread] Manage client started");
2462
2463 lttng_payload_init(&cmd_ctx.reply_payload);
2464
2465 is_root = (getuid() == 0);
2466
2467 pthread_cleanup_push(thread_init_cleanup, NULL);
2468
2469 rcu_register_thread();
2470
2471 health_register(the_health_sessiond, HEALTH_SESSIOND_TYPE_CMD);
2472
2473 health_code_update();
2474
2475 ret = lttcomm_listen_unix_sock(client_sock);
2476 if (ret < 0) {
2477 goto error_listen;
2478 }
2479
2480 /*
2481 * Pass 2 as size here for the thread quit pipe and client_sock. Nothing
2482 * more will be added to this poll set.
2483 */
2484 ret = lttng_poll_create(&events, 2, LTTNG_CLOEXEC);
2485 if (ret < 0) {
2486 goto error_create_poll;
2487 }
2488
2489 /* Add the application registration socket */
2490 ret = lttng_poll_add(&events, client_sock, LPOLLIN | LPOLLPRI);
2491 if (ret < 0) {
2492 goto error;
2493 }
2494
2495 /* Add thread quit pipe */
2496 ret = lttng_poll_add(&events, thread_quit_pipe_fd, LPOLLIN | LPOLLERR);
2497 if (ret < 0) {
2498 goto error;
2499 }
2500
2501 /* Set state as running. */
2502 set_thread_status(true);
2503 pthread_cleanup_pop(0);
2504
2505 /* This testpoint is after we signal readiness to the parent. */
2506 if (testpoint(sessiond_thread_manage_clients)) {
2507 goto error;
2508 }
2509
2510 if (testpoint(sessiond_thread_manage_clients_before_loop)) {
2511 goto error;
2512 }
2513
2514 health_code_update();
2515
2516 while (1) {
2517 const struct cmd_completion_handler *cmd_completion_handler;
2518
2519 cmd_ctx.creds = (lttng_sock_cred) {
2520 .uid = UINT32_MAX,
2521 .gid = UINT32_MAX,
2522 };
2523 cmd_ctx.session = NULL;
2524 lttng_payload_clear(&cmd_ctx.reply_payload);
2525 cmd_ctx.lttng_msg_size = 0;
2526
2527 DBG("Accepting client command ...");
2528
2529 /* Inifinite blocking call, waiting for transmission */
2530 restart:
2531 health_poll_entry();
2532 ret = lttng_poll_wait(&events, -1);
2533 health_poll_exit();
2534 if (ret < 0) {
2535 /*
2536 * Restart interrupted system call.
2537 */
2538 if (errno == EINTR) {
2539 goto restart;
2540 }
2541 goto error;
2542 }
2543
2544 nb_fd = ret;
2545
2546 for (i = 0; i < nb_fd; i++) {
2547 revents = LTTNG_POLL_GETEV(&events, i);
2548 pollfd = LTTNG_POLL_GETFD(&events, i);
2549
2550 health_code_update();
2551
2552 if (pollfd == thread_quit_pipe_fd) {
2553 err = 0;
2554 goto exit;
2555 } else {
2556 /* Event on the registration socket */
2557 if (revents & LPOLLIN) {
2558 continue;
2559 } else if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
2560 ERR("Client socket poll error");
2561 goto error;
2562 } else {
2563 ERR("Unexpected poll events %u for sock %d", revents, pollfd);
2564 goto error;
2565 }
2566 }
2567 }
2568
2569 DBG("Wait for client response");
2570
2571 health_code_update();
2572
2573 sock = lttcomm_accept_unix_sock(client_sock);
2574 if (sock < 0) {
2575 goto error;
2576 }
2577
2578 /*
2579 * Set the CLOEXEC flag. Return code is useless because either way, the
2580 * show must go on.
2581 */
2582 (void) utils_set_fd_cloexec(sock);
2583
2584 /* Set socket option for credentials retrieval */
2585 ret = lttcomm_setsockopt_creds_unix_sock(sock);
2586 if (ret < 0) {
2587 goto error;
2588 }
2589
2590 health_code_update();
2591
2592 /*
2593 * Data is received from the lttng client. The struct
2594 * lttcomm_session_msg (lsm) contains the command and data request of
2595 * the client.
2596 */
2597 DBG("Receiving data from client ...");
2598 ret = lttcomm_recv_creds_unix_sock(sock, &cmd_ctx.lsm,
2599 sizeof(struct lttcomm_session_msg), &cmd_ctx.creds);
2600 if (ret != sizeof(struct lttcomm_session_msg)) {
2601 DBG("Incomplete recv() from client... continuing");
2602 ret = close(sock);
2603 if (ret) {
2604 PERROR("close");
2605 }
2606 sock = -1;
2607 continue;
2608 }
2609
2610 health_code_update();
2611
2612 // TODO: Validate cmd_ctx including sanity check for
2613 // security purpose.
2614
2615 rcu_thread_online();
2616 /*
2617 * This function dispatch the work to the kernel or userspace tracer
2618 * libs and fill the lttcomm_lttng_msg data structure of all the needed
2619 * informations for the client. The command context struct contains
2620 * everything this function may needs.
2621 */
2622 ret = process_client_msg(&cmd_ctx, &sock, &sock_error);
2623 rcu_thread_offline();
2624 if (ret < 0) {
2625 if (sock >= 0) {
2626 ret = close(sock);
2627 if (ret) {
2628 PERROR("close");
2629 }
2630 }
2631 sock = -1;
2632 /*
2633 * TODO: Inform client somehow of the fatal error. At
2634 * this point, ret < 0 means that a zmalloc failed
2635 * (ENOMEM). Error detected but still accept
2636 * command, unless a socket error has been
2637 * detected.
2638 */
2639 continue;
2640 }
2641
2642 if (ret < LTTNG_OK || ret >= LTTNG_ERR_NR) {
2643 WARN("Command returned an invalid status code, returning unknown error: "
2644 "command type = %s (%d), ret = %d",
2645 lttcomm_sessiond_command_str(cmd_ctx.lsm.cmd_type),
2646 cmd_ctx.lsm.cmd_type, ret);
2647 ret = LTTNG_ERR_UNK;
2648 }
2649
2650 cmd_completion_handler = cmd_pop_completion_handler();
2651 if (cmd_completion_handler) {
2652 enum lttng_error_code completion_code;
2653
2654 completion_code = cmd_completion_handler->run(
2655 cmd_completion_handler->data);
2656 if (completion_code != LTTNG_OK) {
2657 continue;
2658 }
2659 }
2660
2661 health_code_update();
2662
2663 if (sock >= 0) {
2664 struct lttng_payload_view view =
2665 lttng_payload_view_from_payload(
2666 &cmd_ctx.reply_payload,
2667 0, -1);
2668 struct lttcomm_lttng_msg *llm = (typeof(
2669 llm)) cmd_ctx.reply_payload.buffer.data;
2670
2671 assert(cmd_ctx.reply_payload.buffer.size >= sizeof(*llm));
2672 assert(cmd_ctx.lttng_msg_size == cmd_ctx.reply_payload.buffer.size);
2673
2674 llm->fd_count = lttng_payload_view_get_fd_handle_count(&view);
2675
2676 DBG("Sending response (size: %d, retcode: %s (%d))",
2677 cmd_ctx.lttng_msg_size,
2678 lttng_strerror(-llm->ret_code),
2679 llm->ret_code);
2680 ret = send_unix_sock(sock, &view);
2681 if (ret < 0) {
2682 ERR("Failed to send data back to client");
2683 }
2684
2685 /* End of transmission */
2686 ret = close(sock);
2687 if (ret) {
2688 PERROR("close");
2689 }
2690 }
2691 sock = -1;
2692
2693 health_code_update();
2694 }
2695
2696 exit:
2697 error:
2698 if (sock >= 0) {
2699 ret = close(sock);
2700 if (ret) {
2701 PERROR("close");
2702 }
2703 }
2704
2705 lttng_poll_clean(&events);
2706
2707 error_listen:
2708 error_create_poll:
2709 unlink(the_config.client_unix_sock_path.value);
2710 ret = close(client_sock);
2711 if (ret) {
2712 PERROR("close");
2713 }
2714
2715 if (err) {
2716 health_error();
2717 ERR("Health error occurred in %s", __func__);
2718 }
2719
2720 health_unregister(the_health_sessiond);
2721
2722 DBG("Client thread dying");
2723 lttng_payload_reset(&cmd_ctx.reply_payload);
2724 rcu_unregister_thread();
2725 return NULL;
2726 }
2727
2728 static
2729 bool shutdown_client_thread(void *thread_data)
2730 {
2731 struct lttng_pipe *client_quit_pipe = thread_data;
2732 const int write_fd = lttng_pipe_get_writefd(client_quit_pipe);
2733
2734 return notify_thread_pipe(write_fd) == 1;
2735 }
2736
2737 struct lttng_thread *launch_client_thread(void)
2738 {
2739 bool thread_running;
2740 struct lttng_pipe *client_quit_pipe;
2741 struct lttng_thread *thread = NULL;
2742 int client_sock_fd = -1;
2743
2744 sem_init(&thread_state.ready, 0, 0);
2745 client_quit_pipe = lttng_pipe_open(FD_CLOEXEC);
2746 if (!client_quit_pipe) {
2747 goto error;
2748 }
2749
2750 client_sock_fd = create_client_sock();
2751 if (client_sock_fd < 0) {
2752 goto error;
2753 }
2754
2755 thread_state.client_sock = client_sock_fd;
2756 thread = lttng_thread_create("Client management",
2757 thread_manage_clients,
2758 shutdown_client_thread,
2759 cleanup_client_thread,
2760 client_quit_pipe);
2761 if (!thread) {
2762 goto error;
2763 }
2764 /* The client thread now owns the client sock fd and the quit pipe. */
2765 client_sock_fd = -1;
2766 client_quit_pipe = NULL;
2767
2768 /*
2769 * This thread is part of the threads that need to be fully
2770 * initialized before the session daemon is marked as "ready".
2771 */
2772 thread_running = wait_thread_status();
2773 if (!thread_running) {
2774 goto error;
2775 }
2776 return thread;
2777 error:
2778 if (client_sock_fd >= 0) {
2779 if (close(client_sock_fd)) {
2780 PERROR("Failed to close client socket");
2781 }
2782 }
2783 lttng_thread_put(thread);
2784 cleanup_client_thread(client_quit_pipe);
2785 return NULL;
2786 }
LTTng 2.0 tools and control repository
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