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Propagate trace format to ltt_ust_session
[deliverable/lttng-tools.git] / src / bin / lttng-sessiond / client.cpp
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.hpp"
11 #include "common/compat/socket.hpp"
12 #include "common/dynamic-array.hpp"
13 #include "common/dynamic-buffer.hpp"
14 #include "common/fd-handle.hpp"
15 #include "common/payload-view.hpp"
16 #include "common/payload.hpp"
17 #include "common/sessiond-comm/sessiond-comm.hpp"
18 #include "lttng/lttng-error.h"
19 #include "lttng/tracker.h"
20 #include <common/compat/getenv.hpp>
21 #include <common/tracker.hpp>
22 #include <common/unix.hpp>
23 #include <common/utils.hpp>
24 #include <lttng/error-query-internal.hpp>
25 #include <lttng/event-internal.hpp>
26 #include <lttng/session-descriptor-internal.hpp>
27 #include <lttng/session-internal.hpp>
28 #include <lttng/userspace-probe-internal.hpp>
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.hpp"
37 #include "clear.hpp"
38 #include "client.hpp"
39 #include "cmd.hpp"
40 #include "health-sessiond.hpp"
41 #include "kernel.hpp"
42 #include "lttng-sessiond.hpp"
43 #include "manage-consumer.hpp"
44 #include "save.hpp"
45 #include "testpoint.hpp"
46 #include "utils.hpp"
47
48 namespace {
49 bool is_root;
50
51 struct thread_state {
52 sem_t ready;
53 bool running;
54 int client_sock;
55 } thread_state;
56 } /* namespace */
57
58 static void set_thread_status(bool running)
59 {
60 DBG("Marking client thread's state as %s", running ? "running" : "error");
61 thread_state.running = running;
62 sem_post(&thread_state.ready);
63 }
64
65 static bool wait_thread_status(void)
66 {
67 DBG("Waiting for client thread to be ready");
68 sem_wait(&thread_state.ready);
69 if (thread_state.running) {
70 DBG("Client thread is ready");
71 } else {
72 ERR("Initialization of client thread failed");
73 }
74
75 return thread_state.running;
76 }
77
78 /*
79 * Setup the outgoing data buffer for the response (llm) by allocating the
80 * right amount of memory and copying the original information from the lsm
81 * structure.
82 *
83 * Return 0 on success, negative value on error.
84 */
85 static int setup_lttng_msg(struct command_ctx *cmd_ctx,
86 const void *payload_buf, size_t payload_len,
87 const void *cmd_header_buf, size_t cmd_header_len)
88 {
89 int ret = 0;
90 const size_t header_len = sizeof(struct lttcomm_lttng_msg);
91 const size_t total_msg_size = header_len + cmd_header_len + payload_len;
92 lttcomm_lttng_msg llm {};
93
94 llm.cmd_type = cmd_ctx->lsm.cmd_type;
95 llm.pid = (uint32_t) cmd_ctx->lsm.domain.attr.pid;
96 llm.cmd_header_size = (uint32_t) cmd_header_len;
97 llm.data_size = (uint32_t) payload_len;
98
99 ret = lttng_dynamic_buffer_set_size(&cmd_ctx->reply_payload.buffer, 0);
100 if (ret) {
101 goto end;
102 }
103
104 lttng_dynamic_pointer_array_clear(&cmd_ctx->reply_payload._fd_handles);
105
106 cmd_ctx->lttng_msg_size = total_msg_size;
107
108 /* Append reply header. */
109 ret = lttng_dynamic_buffer_append(
110 &cmd_ctx->reply_payload.buffer, &llm, sizeof(llm));
111 if (ret) {
112 goto end;
113 }
114
115 /* Append command header. */
116 if (cmd_header_len) {
117 ret = lttng_dynamic_buffer_append(
118 &cmd_ctx->reply_payload.buffer, cmd_header_buf,
119 cmd_header_len);
120 if (ret) {
121 goto end;
122 }
123 }
124
125 /* Append payload. */
126 if (payload_len) {
127 ret = lttng_dynamic_buffer_append(
128 &cmd_ctx->reply_payload.buffer, payload_buf,
129 payload_len);
130 if (ret) {
131 goto end;
132 }
133 }
134
135 end:
136 return ret;
137 }
138
139 static int setup_empty_lttng_msg(struct command_ctx *cmd_ctx)
140 {
141 int ret;
142 const struct lttcomm_lttng_msg llm = {};
143
144 ret = lttng_dynamic_buffer_set_size(&cmd_ctx->reply_payload.buffer, 0);
145 if (ret) {
146 goto end;
147 }
148
149 /* Append place-holder reply header. */
150 ret = lttng_dynamic_buffer_append(
151 &cmd_ctx->reply_payload.buffer, &llm, sizeof(llm));
152 if (ret) {
153 goto end;
154 }
155
156 cmd_ctx->lttng_msg_size = sizeof(llm);
157 end:
158 return ret;
159 }
160
161 static void update_lttng_msg(struct command_ctx *cmd_ctx, size_t cmd_header_len,
162 size_t payload_len)
163 {
164 const size_t header_len = sizeof(struct lttcomm_lttng_msg);
165 const size_t total_msg_size = header_len + cmd_header_len + payload_len;
166 struct lttcomm_lttng_msg *p_llm;
167 lttcomm_lttng_msg llm {};
168
169 llm.cmd_type = cmd_ctx->lsm.cmd_type;
170 llm.pid = (uint32_t) cmd_ctx->lsm.domain.attr.pid;
171 llm.cmd_header_size = (uint32_t) cmd_header_len;
172 llm.data_size = (uint32_t) payload_len;
173
174 LTTNG_ASSERT(cmd_ctx->reply_payload.buffer.size >= sizeof(llm));
175
176 p_llm = (typeof(p_llm)) cmd_ctx->reply_payload.buffer.data;
177
178 /* Update existing header. */
179 memcpy(p_llm, &llm, sizeof(llm));
180
181 cmd_ctx->lttng_msg_size = total_msg_size;
182 }
183
184 /*
185 * Start the thread_manage_consumer. This must be done after a lttng-consumerd
186 * exec or it will fail.
187 */
188 static int spawn_consumer_thread(struct consumer_data *consumer_data)
189 {
190 return launch_consumer_management_thread(consumer_data) ? 0 : -1;
191 }
192
193 /*
194 * Fork and exec a consumer daemon (consumerd).
195 *
196 * Return pid if successful else -1.
197 */
198 static pid_t spawn_consumerd(struct consumer_data *consumer_data)
199 {
200 int ret;
201 pid_t pid;
202 const char *consumer_to_use;
203 const char *verbosity;
204 struct stat st;
205
206 DBG("Spawning consumerd");
207
208 pid = fork();
209 if (pid == 0) {
210 /*
211 * Exec consumerd.
212 */
213 if (the_config.verbose_consumer) {
214 verbosity = "--verbose";
215 } else if (lttng_opt_quiet) {
216 verbosity = "--quiet";
217 } else {
218 verbosity = "";
219 }
220
221 switch (consumer_data->type) {
222 case LTTNG_CONSUMER_KERNEL:
223 /*
224 * Find out which consumerd to execute. We will first try the
225 * 64-bit path, then the sessiond's installation directory, and
226 * fallback on the 32-bit one,
227 */
228 DBG3("Looking for a kernel consumer at these locations:");
229 DBG3(" 1) %s", the_config.consumerd64_bin_path.value ? : "NULL");
230 DBG3(" 2) %s/%s", INSTALL_BIN_PATH, DEFAULT_CONSUMERD_FILE);
231 DBG3(" 3) %s", the_config.consumerd32_bin_path.value ? : "NULL");
232 if (stat(the_config.consumerd64_bin_path.value, &st) == 0) {
233 DBG3("Found location #1");
234 consumer_to_use = the_config.consumerd64_bin_path.value;
235 } else if (stat(INSTALL_BIN_PATH "/" DEFAULT_CONSUMERD_FILE, &st) == 0) {
236 DBG3("Found location #2");
237 consumer_to_use = INSTALL_BIN_PATH "/" DEFAULT_CONSUMERD_FILE;
238 } else if (the_config.consumerd32_bin_path.value &&
239 stat(the_config.consumerd32_bin_path.value, &st) == 0) {
240 DBG3("Found location #3");
241 consumer_to_use = the_config.consumerd32_bin_path.value;
242 } else {
243 DBG("Could not find any valid consumerd executable");
244 ret = -EINVAL;
245 goto error;
246 }
247 DBG("Using kernel consumer at: %s", consumer_to_use);
248 (void) execl(consumer_to_use, "lttng-consumerd",
249 verbosity, "-k", "--consumerd-cmd-sock",
250 consumer_data->cmd_unix_sock_path,
251 "--consumerd-err-sock",
252 consumer_data->err_unix_sock_path,
253 "--group",
254 the_config.tracing_group_name.value,
255 NULL);
256 break;
257 case LTTNG_CONSUMER64_UST:
258 {
259 if (the_config.consumerd64_lib_dir.value) {
260 const char *tmp;
261 size_t tmplen;
262 char *tmpnew;
263
264 tmp = lttng_secure_getenv("LD_LIBRARY_PATH");
265 if (!tmp) {
266 tmp = "";
267 }
268 tmplen = strlen(the_config.consumerd64_lib_dir.value) + 1 /* : */ + strlen(tmp);
269 tmpnew = zmalloc<char>(tmplen + 1 /* \0 */);
270 if (!tmpnew) {
271 ret = -ENOMEM;
272 goto error;
273 }
274 strcat(tmpnew, the_config.consumerd64_lib_dir.value);
275 if (tmp[0] != '\0') {
276 strcat(tmpnew, ":");
277 strcat(tmpnew, tmp);
278 }
279 ret = setenv("LD_LIBRARY_PATH", tmpnew, 1);
280 free(tmpnew);
281 if (ret) {
282 ret = -errno;
283 goto error;
284 }
285 }
286 DBG("Using 64-bit UST consumer at: %s",
287 the_config.consumerd64_bin_path.value);
288 (void) execl(the_config.consumerd64_bin_path.value,
289 "lttng-consumerd", verbosity, "-u",
290 "--consumerd-cmd-sock",
291 consumer_data->cmd_unix_sock_path,
292 "--consumerd-err-sock",
293 consumer_data->err_unix_sock_path,
294 "--group",
295 the_config.tracing_group_name.value,
296 NULL);
297 break;
298 }
299 case LTTNG_CONSUMER32_UST:
300 {
301 if (the_config.consumerd32_lib_dir.value) {
302 const char *tmp;
303 size_t tmplen;
304 char *tmpnew;
305
306 tmp = lttng_secure_getenv("LD_LIBRARY_PATH");
307 if (!tmp) {
308 tmp = "";
309 }
310 tmplen = strlen(the_config.consumerd32_lib_dir.value) + 1 /* : */ + strlen(tmp);
311 tmpnew = zmalloc<char>(tmplen + 1 /* \0 */);
312 if (!tmpnew) {
313 ret = -ENOMEM;
314 goto error;
315 }
316 strcat(tmpnew, the_config.consumerd32_lib_dir.value);
317 if (tmp[0] != '\0') {
318 strcat(tmpnew, ":");
319 strcat(tmpnew, tmp);
320 }
321 ret = setenv("LD_LIBRARY_PATH", tmpnew, 1);
322 free(tmpnew);
323 if (ret) {
324 ret = -errno;
325 goto error;
326 }
327 }
328 DBG("Using 32-bit UST consumer at: %s",
329 the_config.consumerd32_bin_path.value);
330 (void) execl(the_config.consumerd32_bin_path.value,
331 "lttng-consumerd", verbosity, "-u",
332 "--consumerd-cmd-sock",
333 consumer_data->cmd_unix_sock_path,
334 "--consumerd-err-sock",
335 consumer_data->err_unix_sock_path,
336 "--group",
337 the_config.tracing_group_name.value,
338 NULL);
339 break;
340 }
341 default:
342 ERR("unknown consumer type");
343 errno = 0;
344 }
345 if (errno != 0) {
346 PERROR("Consumer execl()");
347 }
348 /* Reaching this point, we got a failure on our execl(). */
349 exit(EXIT_FAILURE);
350 } else if (pid > 0) {
351 ret = pid;
352 } else {
353 PERROR("start consumer fork");
354 ret = -errno;
355 }
356 error:
357 return ret;
358 }
359
360 /*
361 * Spawn the consumerd daemon and session daemon thread.
362 */
363 static int start_consumerd(struct consumer_data *consumer_data)
364 {
365 int ret;
366
367 /*
368 * Set the listen() state on the socket since there is a possible race
369 * between the exec() of the consumer daemon and this call if place in the
370 * consumer thread. See bug #366 for more details.
371 */
372 ret = lttcomm_listen_unix_sock(consumer_data->err_sock);
373 if (ret < 0) {
374 goto error;
375 }
376
377 pthread_mutex_lock(&consumer_data->pid_mutex);
378 if (consumer_data->pid != 0) {
379 pthread_mutex_unlock(&consumer_data->pid_mutex);
380 goto end;
381 }
382
383 ret = spawn_consumerd(consumer_data);
384 if (ret < 0) {
385 ERR("Spawning consumerd failed");
386 pthread_mutex_unlock(&consumer_data->pid_mutex);
387 goto error;
388 }
389
390 /* Setting up the consumer_data pid */
391 consumer_data->pid = ret;
392 DBG2("Consumer pid %d", consumer_data->pid);
393 pthread_mutex_unlock(&consumer_data->pid_mutex);
394
395 DBG2("Spawning consumer control thread");
396 ret = spawn_consumer_thread(consumer_data);
397 if (ret < 0) {
398 ERR("Fatal error spawning consumer control thread");
399 goto error;
400 }
401
402 end:
403 return 0;
404
405 error:
406 /* Cleanup already created sockets on error. */
407 if (consumer_data->err_sock >= 0) {
408 int err;
409
410 err = close(consumer_data->err_sock);
411 if (err < 0) {
412 PERROR("close consumer data error socket");
413 }
414 }
415 return ret;
416 }
417
418 /*
419 * Copy consumer output from the tracing session to the domain session. The
420 * function also applies the right modification on a per domain basis for the
421 * trace files destination directory.
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 LTTNG_ASSERT(session);
430 LTTNG_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 static int create_ust_session(struct ltt_session *session,
487 const struct lttng_domain *domain)
488 {
489 int ret;
490 struct ltt_ust_session *lus = NULL;
491
492 LTTNG_ASSERT(session);
493 LTTNG_ASSERT(domain);
494 LTTNG_ASSERT(session->consumer);
495
496 switch (domain->type) {
497 case LTTNG_DOMAIN_JUL:
498 case LTTNG_DOMAIN_LOG4J:
499 case LTTNG_DOMAIN_PYTHON:
500 case LTTNG_DOMAIN_UST:
501 break;
502 default:
503 ERR("Unknown UST domain on create session %d", domain->type);
504 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
505 goto error;
506 }
507
508 DBG("Creating UST session");
509
510 lus = trace_ust_create_session(session->id);
511 if (lus == NULL) {
512 ret = LTTNG_ERR_UST_SESS_FAIL;
513 goto error;
514 }
515
516 lus->uid = session->uid;
517 lus->gid = session->gid;
518 lus->output_traces = session->output_traces;
519 lus->snapshot_mode = session->snapshot_mode;
520 lus->live_timer_interval = session->live_timer;
521 session->ust_session = lus;
522 if (session->shm_path[0]) {
523 strncpy(lus->root_shm_path, session->shm_path,
524 sizeof(lus->root_shm_path));
525 lus->root_shm_path[sizeof(lus->root_shm_path) - 1] = '\0';
526 strncpy(lus->shm_path, session->shm_path,
527 sizeof(lus->shm_path));
528 lus->shm_path[sizeof(lus->shm_path) - 1] = '\0';
529 strncat(lus->shm_path, "/ust",
530 sizeof(lus->shm_path) - strlen(lus->shm_path) - 1);
531 }
532 /* Copy session output to the newly created UST session */
533 ret = copy_session_consumer(domain->type, session);
534 if (ret != LTTNG_OK) {
535 goto error;
536 }
537
538 lus->trace_format = session->trace_format;
539
540 return LTTNG_OK;
541
542 error:
543 delete (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 LTTNG_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 static enum lttng_error_code receive_lttng_trigger(struct command_ctx *cmd_ctx,
588 int sock,
589 int *sock_error,
590 struct lttng_trigger **_trigger)
591 {
592 int ret;
593 size_t trigger_len;
594 ssize_t sock_recv_len;
595 enum lttng_error_code ret_code;
596 struct lttng_payload trigger_payload;
597 struct lttng_trigger *trigger = NULL;
598
599 lttng_payload_init(&trigger_payload);
600 trigger_len = (size_t) cmd_ctx->lsm.u.trigger.length;
601 ret = lttng_dynamic_buffer_set_size(
602 &trigger_payload.buffer, trigger_len);
603 if (ret) {
604 ret_code = LTTNG_ERR_NOMEM;
605 goto end;
606 }
607
608 sock_recv_len = lttcomm_recv_unix_sock(
609 sock, trigger_payload.buffer.data, trigger_len);
610 if (sock_recv_len < 0 || sock_recv_len != trigger_len) {
611 ERR("Failed to receive trigger in command payload");
612 *sock_error = 1;
613 ret_code = LTTNG_ERR_INVALID_PROTOCOL;
614 goto end;
615 }
616
617 /* Receive fds, if any. */
618 if (cmd_ctx->lsm.fd_count > 0) {
619 sock_recv_len = lttcomm_recv_payload_fds_unix_sock(
620 sock, cmd_ctx->lsm.fd_count, &trigger_payload);
621 if (sock_recv_len > 0 &&
622 sock_recv_len != cmd_ctx->lsm.fd_count * sizeof(int)) {
623 ERR("Failed to receive all file descriptors for trigger in command payload: expected fd count = %u, ret = %d",
624 cmd_ctx->lsm.fd_count, (int) ret);
625 ret_code = LTTNG_ERR_INVALID_PROTOCOL;
626 *sock_error = 1;
627 goto end;
628 } else if (sock_recv_len <= 0) {
629 ERR("Failed to receive file descriptors for trigger in command payload: expected fd count = %u, ret = %d",
630 cmd_ctx->lsm.fd_count, (int) ret);
631 ret_code = LTTNG_ERR_FATAL;
632 *sock_error = 1;
633 goto end;
634 }
635 }
636
637 /* Deserialize trigger. */
638 {
639 struct lttng_payload_view view =
640 lttng_payload_view_from_payload(
641 &trigger_payload, 0, -1);
642
643 if (lttng_trigger_create_from_payload(&view, &trigger) !=
644 trigger_len) {
645 ERR("Invalid trigger received as part of command payload");
646 ret_code = LTTNG_ERR_INVALID_TRIGGER;
647 lttng_trigger_put(trigger);
648 goto end;
649 }
650 }
651
652 *_trigger = trigger;
653 ret_code = LTTNG_OK;
654
655 end:
656 lttng_payload_reset(&trigger_payload);
657 return ret_code;
658 }
659
660 static enum lttng_error_code receive_lttng_error_query(struct command_ctx *cmd_ctx,
661 int sock,
662 int *sock_error,
663 struct lttng_error_query **_query)
664 {
665 int ret;
666 size_t query_len;
667 ssize_t sock_recv_len;
668 enum lttng_error_code ret_code;
669 struct lttng_payload query_payload;
670 struct lttng_error_query *query = NULL;
671
672 lttng_payload_init(&query_payload);
673 query_len = (size_t) cmd_ctx->lsm.u.error_query.length;
674 ret = lttng_dynamic_buffer_set_size(&query_payload.buffer, query_len);
675 if (ret) {
676 ret_code = LTTNG_ERR_NOMEM;
677 goto end;
678 }
679
680 sock_recv_len = lttcomm_recv_unix_sock(
681 sock, query_payload.buffer.data, query_len);
682 if (sock_recv_len < 0 || sock_recv_len != query_len) {
683 ERR("Failed to receive error query in command payload");
684 *sock_error = 1;
685 ret_code = LTTNG_ERR_INVALID_PROTOCOL;
686 goto end;
687 }
688
689 /* Receive fds, if any. */
690 if (cmd_ctx->lsm.fd_count > 0) {
691 sock_recv_len = lttcomm_recv_payload_fds_unix_sock(
692 sock, cmd_ctx->lsm.fd_count, &query_payload);
693 if (sock_recv_len > 0 &&
694 sock_recv_len != cmd_ctx->lsm.fd_count * sizeof(int)) {
695 ERR("Failed to receive all file descriptors for error query in command payload: expected fd count = %u, ret = %d",
696 cmd_ctx->lsm.fd_count, (int) ret);
697 ret_code = LTTNG_ERR_INVALID_PROTOCOL;
698 *sock_error = 1;
699 goto end;
700 } else if (sock_recv_len <= 0) {
701 ERR("Failed to receive file descriptors for error query in command payload: expected fd count = %u, ret = %d",
702 cmd_ctx->lsm.fd_count, (int) ret);
703 ret_code = LTTNG_ERR_FATAL;
704 *sock_error = 1;
705 goto end;
706 }
707 }
708
709 /* Deserialize error query. */
710 {
711 struct lttng_payload_view view =
712 lttng_payload_view_from_payload(
713 &query_payload, 0, -1);
714
715 if (lttng_error_query_create_from_payload(&view, &query) !=
716 query_len) {
717 ERR("Invalid error query received as part of command payload");
718 ret_code = LTTNG_ERR_INVALID_PROTOCOL;
719 goto end;
720 }
721 }
722
723 *_query = query;
724 ret_code = LTTNG_OK;
725
726 end:
727 lttng_payload_reset(&query_payload);
728 return ret_code;
729 }
730
731 static enum lttng_error_code receive_lttng_event(struct command_ctx *cmd_ctx,
732 int sock,
733 int *sock_error,
734 struct lttng_event **out_event,
735 char **out_filter_expression,
736 struct lttng_bytecode **out_bytecode,
737 struct lttng_event_exclusion **out_exclusion)
738 {
739 int ret;
740 size_t event_len;
741 ssize_t sock_recv_len;
742 enum lttng_error_code ret_code;
743 struct lttng_payload event_payload;
744 struct lttng_event *local_event = NULL;
745 char *local_filter_expression = NULL;
746 struct lttng_bytecode *local_bytecode = NULL;
747 struct lttng_event_exclusion *local_exclusion = NULL;
748
749 lttng_payload_init(&event_payload);
750 if (cmd_ctx->lsm.cmd_type == LTTNG_ENABLE_EVENT) {
751 event_len = (size_t) cmd_ctx->lsm.u.enable.length;
752 } else if (cmd_ctx->lsm.cmd_type == LTTNG_DISABLE_EVENT) {
753 event_len = (size_t) cmd_ctx->lsm.u.disable.length;
754 } else {
755 abort();
756 }
757
758 ret = lttng_dynamic_buffer_set_size(&event_payload.buffer, event_len);
759 if (ret) {
760 ret_code = LTTNG_ERR_NOMEM;
761 goto end;
762 }
763
764 sock_recv_len = lttcomm_recv_unix_sock(
765 sock, event_payload.buffer.data, event_len);
766 if (sock_recv_len < 0 || sock_recv_len != event_len) {
767 ERR("Failed to receive event in command payload");
768 *sock_error = 1;
769 ret_code = LTTNG_ERR_INVALID_PROTOCOL;
770 goto end;
771 }
772
773 /* Receive fds, if any. */
774 if (cmd_ctx->lsm.fd_count > 0) {
775 sock_recv_len = lttcomm_recv_payload_fds_unix_sock(
776 sock, cmd_ctx->lsm.fd_count, &event_payload);
777 if (sock_recv_len > 0 &&
778 sock_recv_len != cmd_ctx->lsm.fd_count * sizeof(int)) {
779 ERR("Failed to receive all file descriptors for event in command payload: expected fd count = %u, ret = %d",
780 cmd_ctx->lsm.fd_count, (int) ret);
781 ret_code = LTTNG_ERR_INVALID_PROTOCOL;
782 *sock_error = 1;
783 goto end;
784 } else if (sock_recv_len <= 0) {
785 ERR("Failed to receive file descriptors for event in command payload: expected fd count = %u, ret = %d",
786 cmd_ctx->lsm.fd_count, (int) ret);
787 ret_code = LTTNG_ERR_FATAL;
788 *sock_error = 1;
789 goto end;
790 }
791 }
792
793 /* Deserialize event. */
794 {
795 ssize_t len;
796 struct lttng_payload_view event_view =
797 lttng_payload_view_from_payload(
798 &event_payload, 0, -1);
799
800 len = lttng_event_create_from_payload(&event_view, &local_event,
801 &local_exclusion, &local_filter_expression,
802 &local_bytecode);
803
804 if (len < 0) {
805 ERR("Failed to create an event from the received buffer");
806 ret_code = LTTNG_ERR_INVALID_PROTOCOL;
807 goto end;
808 }
809
810 if (len != event_len) {
811 ERR("Userspace probe location from the received buffer is not the advertised length: header length = %zu" PRIu32 ", payload length = %zd", event_len, len);
812 ret_code = LTTNG_ERR_INVALID_PROTOCOL;
813 goto end;
814 }
815 }
816
817 *out_event = local_event;
818 *out_exclusion = local_exclusion;
819 *out_filter_expression = local_filter_expression;
820 *out_bytecode = local_bytecode;
821 local_event = NULL;
822 local_exclusion = NULL;
823 local_filter_expression = NULL;
824 local_bytecode = NULL;
825
826 ret_code = LTTNG_OK;
827
828 end:
829 lttng_payload_reset(&event_payload);
830 lttng_event_destroy(local_event);
831 free(local_filter_expression);
832 free(local_bytecode);
833 free(local_exclusion);
834 return ret_code;
835 }
836
837 static enum lttng_error_code receive_lttng_event_context(
838 const struct command_ctx *cmd_ctx,
839 int sock,
840 int *sock_error,
841 struct lttng_event_context **out_event_context)
842 {
843 int ret;
844 const size_t event_context_len =
845 (size_t) cmd_ctx->lsm.u.context.length;
846 ssize_t sock_recv_len;
847 enum lttng_error_code ret_code;
848 struct lttng_payload event_context_payload;
849 struct lttng_event_context *context = NULL;
850
851 lttng_payload_init(&event_context_payload);
852
853 ret = lttng_dynamic_buffer_set_size(&event_context_payload.buffer,
854 event_context_len);
855 if (ret) {
856 ret_code = LTTNG_ERR_NOMEM;
857 goto end;
858 }
859
860 sock_recv_len = lttcomm_recv_unix_sock(
861 sock, event_context_payload.buffer.data,
862 event_context_len);
863 if (sock_recv_len < 0 || sock_recv_len != event_context_len) {
864 ERR("Failed to receive event context in command payload");
865 *sock_error = 1;
866 ret_code = LTTNG_ERR_INVALID_PROTOCOL;
867 goto end;
868 }
869
870 /* Deserialize event. */
871 {
872 ssize_t len;
873 struct lttng_payload_view event_context_view =
874 lttng_payload_view_from_payload(
875 &event_context_payload, 0, -1);
876
877 len = lttng_event_context_create_from_payload(
878 &event_context_view, &context);
879
880 if (len < 0) {
881 ERR("Failed to create a event context from the received buffer");
882 ret_code = LTTNG_ERR_INVALID_PROTOCOL;
883 goto end;
884 }
885
886 if (len != event_context_len) {
887 ERR("Event context from the received buffer is not the advertised length: expected length = %zu, payload length = %zd", event_context_len, len);
888 ret_code = LTTNG_ERR_INVALID_PROTOCOL;
889 goto end;
890 }
891 }
892
893 *out_event_context = context;
894 context = NULL;
895 ret_code = LTTNG_OK;
896
897 end:
898 lttng_event_context_destroy(context);
899 lttng_payload_reset(&event_context_payload);
900 return ret_code;
901 }
902
903 /*
904 * Version of setup_lttng_msg() without command header.
905 */
906 static int setup_lttng_msg_no_cmd_header(struct command_ctx *cmd_ctx,
907 void *payload_buf, size_t payload_len)
908 {
909 return setup_lttng_msg(cmd_ctx, payload_buf, payload_len, NULL, 0);
910 }
911
912 /*
913 * Check if the current kernel tracer supports the session rotation feature.
914 * Return 1 if it does, 0 otherwise.
915 */
916 static int check_rotate_compatible(void)
917 {
918 int ret = 1;
919
920 if (the_kernel_tracer_version.major != 2 ||
921 the_kernel_tracer_version.minor < 11) {
922 DBG("Kernel tracer version is not compatible with the rotation feature");
923 ret = 0;
924 }
925
926 return ret;
927 }
928
929 /*
930 * Send data on a unix socket using the liblttsessiondcomm API.
931 *
932 * Return lttcomm error code.
933 */
934 static int send_unix_sock(int sock, struct lttng_payload_view *view)
935 {
936 int ret;
937 const int fd_count = lttng_payload_view_get_fd_handle_count(view);
938
939 /* Check valid length */
940 if (view->buffer.size == 0) {
941 ret = -1;
942 goto end;
943 }
944
945 ret = lttcomm_send_unix_sock(
946 sock, view->buffer.data, view->buffer.size);
947 if (ret < 0) {
948 goto end;
949 }
950
951 if (fd_count > 0) {
952 ret = lttcomm_send_payload_view_fds_unix_sock(sock, view);
953 if (ret < 0) {
954 goto end;
955 }
956 }
957
958 end:
959 return ret;
960 }
961
962 /*
963 * Process the command requested by the lttng client within the command
964 * context structure. This function make sure that the return structure (llm)
965 * is set and ready for transmission before returning.
966 *
967 * Return any error encountered or 0 for success.
968 *
969 * "sock" is only used for special-case var. len data.
970 * A command may assume the ownership of the socket, in which case its value
971 * should be set to -1.
972 */
973 static int process_client_msg(struct command_ctx *cmd_ctx, int *sock,
974 int *sock_error)
975 {
976 int ret = LTTNG_OK;
977 bool need_tracing_session = true;
978 bool need_domain;
979 bool need_consumerd;
980
981 DBG("Processing client command '%s\' (%d)",
982 lttcomm_sessiond_command_str((lttcomm_sessiond_command) cmd_ctx->lsm.cmd_type),
983 cmd_ctx->lsm.cmd_type);
984
985 *sock_error = 0;
986
987 switch (cmd_ctx->lsm.cmd_type) {
988 case LTTNG_CREATE_SESSION_EXT:
989 case LTTNG_DESTROY_SESSION:
990 case LTTNG_LIST_SESSIONS:
991 case LTTNG_LIST_DOMAINS:
992 case LTTNG_START_TRACE:
993 case LTTNG_STOP_TRACE:
994 case LTTNG_DATA_PENDING:
995 case LTTNG_SNAPSHOT_ADD_OUTPUT:
996 case LTTNG_SNAPSHOT_DEL_OUTPUT:
997 case LTTNG_SNAPSHOT_LIST_OUTPUT:
998 case LTTNG_SNAPSHOT_RECORD:
999 case LTTNG_SAVE_SESSION:
1000 case LTTNG_SET_SESSION_SHM_PATH:
1001 case LTTNG_REGENERATE_METADATA:
1002 case LTTNG_REGENERATE_STATEDUMP:
1003 case LTTNG_ROTATE_SESSION:
1004 case LTTNG_ROTATION_GET_INFO:
1005 case LTTNG_ROTATION_SET_SCHEDULE:
1006 case LTTNG_SESSION_LIST_ROTATION_SCHEDULES:
1007 case LTTNG_CLEAR_SESSION:
1008 case LTTNG_LIST_TRIGGERS:
1009 case LTTNG_EXECUTE_ERROR_QUERY:
1010 need_domain = false;
1011 break;
1012 default:
1013 need_domain = true;
1014 }
1015
1016 /* Needs a functioning consumerd? */
1017 switch (cmd_ctx->lsm.cmd_type) {
1018 case LTTNG_REGISTER_TRIGGER:
1019 case LTTNG_UNREGISTER_TRIGGER:
1020 case LTTNG_EXECUTE_ERROR_QUERY:
1021 need_consumerd = false;
1022 break;
1023 default:
1024 need_consumerd = true;
1025 break;
1026 }
1027
1028 if (the_config.no_kernel && need_domain &&
1029 cmd_ctx->lsm.domain.type == LTTNG_DOMAIN_KERNEL) {
1030 if (!is_root) {
1031 ret = LTTNG_ERR_NEED_ROOT_SESSIOND;
1032 } else {
1033 ret = LTTNG_ERR_KERN_NA;
1034 }
1035 goto error;
1036 }
1037
1038 /* Deny register consumer if we already have a spawned consumer. */
1039 if (cmd_ctx->lsm.cmd_type == LTTNG_REGISTER_CONSUMER) {
1040 pthread_mutex_lock(&the_kconsumer_data.pid_mutex);
1041 if (the_kconsumer_data.pid > 0) {
1042 ret = LTTNG_ERR_KERN_CONSUMER_FAIL;
1043 pthread_mutex_unlock(&the_kconsumer_data.pid_mutex);
1044 goto error;
1045 }
1046 pthread_mutex_unlock(&the_kconsumer_data.pid_mutex);
1047 }
1048
1049 /*
1050 * Check for command that don't needs to allocate a returned payload. We do
1051 * this here so we don't have to make the call for no payload at each
1052 * command.
1053 */
1054 switch(cmd_ctx->lsm.cmd_type) {
1055 case LTTNG_LIST_SESSIONS:
1056 case LTTNG_LIST_TRACEPOINTS:
1057 case LTTNG_LIST_TRACEPOINT_FIELDS:
1058 case LTTNG_LIST_DOMAINS:
1059 case LTTNG_LIST_CHANNELS:
1060 case LTTNG_LIST_EVENTS:
1061 case LTTNG_LIST_SYSCALLS:
1062 case LTTNG_SESSION_LIST_ROTATION_SCHEDULES:
1063 case LTTNG_PROCESS_ATTR_TRACKER_GET_POLICY:
1064 case LTTNG_PROCESS_ATTR_TRACKER_GET_INCLUSION_SET:
1065 case LTTNG_DATA_PENDING:
1066 case LTTNG_ROTATE_SESSION:
1067 case LTTNG_ROTATION_GET_INFO:
1068 case LTTNG_REGISTER_TRIGGER:
1069 case LTTNG_LIST_TRIGGERS:
1070 case LTTNG_EXECUTE_ERROR_QUERY:
1071 break;
1072 default:
1073 /* Setup lttng message with no payload */
1074 ret = setup_lttng_msg_no_cmd_header(cmd_ctx, NULL, 0);
1075 if (ret < 0) {
1076 /* This label does not try to unlock the session */
1077 goto init_setup_error;
1078 }
1079 }
1080
1081 /* Commands that DO NOT need a session. */
1082 switch (cmd_ctx->lsm.cmd_type) {
1083 case LTTNG_CREATE_SESSION_EXT:
1084 case LTTNG_LIST_SESSIONS:
1085 case LTTNG_LIST_TRACEPOINTS:
1086 case LTTNG_LIST_SYSCALLS:
1087 case LTTNG_LIST_TRACEPOINT_FIELDS:
1088 case LTTNG_SAVE_SESSION:
1089 case LTTNG_REGISTER_TRIGGER:
1090 case LTTNG_UNREGISTER_TRIGGER:
1091 case LTTNG_LIST_TRIGGERS:
1092 case LTTNG_EXECUTE_ERROR_QUERY:
1093 need_tracing_session = false;
1094 break;
1095 default:
1096 DBG("Getting session %s by name", cmd_ctx->lsm.session.name);
1097 /*
1098 * We keep the session list lock across _all_ commands
1099 * for now, because the per-session lock does not
1100 * handle teardown properly.
1101 */
1102 session_lock_list();
1103 cmd_ctx->session = session_find_by_name(cmd_ctx->lsm.session.name);
1104 if (cmd_ctx->session == NULL) {
1105 ret = LTTNG_ERR_SESS_NOT_FOUND;
1106 goto error;
1107 } else {
1108 /* Acquire lock for the session */
1109 session_lock(cmd_ctx->session);
1110 }
1111 break;
1112 }
1113
1114 /*
1115 * Commands that need a valid session but should NOT create one if none
1116 * exists. Instead of creating one and destroying it when the command is
1117 * handled, process that right before so we save some round trip in useless
1118 * code path.
1119 */
1120 switch (cmd_ctx->lsm.cmd_type) {
1121 case LTTNG_DISABLE_CHANNEL:
1122 case LTTNG_DISABLE_EVENT:
1123 switch (cmd_ctx->lsm.domain.type) {
1124 case LTTNG_DOMAIN_KERNEL:
1125 if (!cmd_ctx->session->kernel_session) {
1126 ret = LTTNG_ERR_NO_CHANNEL;
1127 goto error;
1128 }
1129 break;
1130 case LTTNG_DOMAIN_JUL:
1131 case LTTNG_DOMAIN_LOG4J:
1132 case LTTNG_DOMAIN_PYTHON:
1133 case LTTNG_DOMAIN_UST:
1134 if (!cmd_ctx->session->ust_session) {
1135 ret = LTTNG_ERR_NO_CHANNEL;
1136 goto error;
1137 }
1138 break;
1139 default:
1140 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
1141 goto error;
1142 }
1143 default:
1144 break;
1145 }
1146
1147 if (!need_domain) {
1148 goto skip_domain;
1149 }
1150
1151 /*
1152 * Check domain type for specific "pre-action".
1153 */
1154 switch (cmd_ctx->lsm.domain.type) {
1155 case LTTNG_DOMAIN_KERNEL:
1156 if (!is_root) {
1157 ret = LTTNG_ERR_NEED_ROOT_SESSIOND;
1158 goto error;
1159 }
1160
1161 /* Kernel tracer check */
1162 if (!kernel_tracer_is_initialized()) {
1163 /* Basically, load kernel tracer modules */
1164 ret = init_kernel_tracer();
1165 if (ret != 0) {
1166 goto error;
1167 }
1168 }
1169
1170 /* Consumer is in an ERROR state. Report back to client */
1171 if (need_consumerd && uatomic_read(&the_kernel_consumerd_state) ==
1172 CONSUMER_ERROR) {
1173 ret = LTTNG_ERR_NO_KERNCONSUMERD;
1174 goto error;
1175 }
1176
1177 /* Need a session for kernel command */
1178 if (need_tracing_session) {
1179 if (cmd_ctx->session->kernel_session == NULL) {
1180 ret = create_kernel_session(cmd_ctx->session);
1181 if (ret != LTTNG_OK) {
1182 ret = LTTNG_ERR_KERN_SESS_FAIL;
1183 goto error;
1184 }
1185 }
1186
1187 /* Start the kernel consumer daemon */
1188 pthread_mutex_lock(&the_kconsumer_data.pid_mutex);
1189 if (the_kconsumer_data.pid == 0 &&
1190 cmd_ctx->lsm.cmd_type != LTTNG_REGISTER_CONSUMER) {
1191 pthread_mutex_unlock(&the_kconsumer_data.pid_mutex);
1192 ret = start_consumerd(&the_kconsumer_data);
1193 if (ret < 0) {
1194 ret = LTTNG_ERR_KERN_CONSUMER_FAIL;
1195 goto error;
1196 }
1197 uatomic_set(&the_kernel_consumerd_state, CONSUMER_STARTED);
1198 } else {
1199 pthread_mutex_unlock(&the_kconsumer_data.pid_mutex);
1200 }
1201
1202 /*
1203 * The consumer was just spawned so we need to add the socket to
1204 * the consumer output of the session if exist.
1205 */
1206 ret = consumer_create_socket(&the_kconsumer_data,
1207 cmd_ctx->session->kernel_session->consumer);
1208 if (ret < 0) {
1209 goto error;
1210 }
1211 }
1212
1213 break;
1214 case LTTNG_DOMAIN_JUL:
1215 case LTTNG_DOMAIN_LOG4J:
1216 case LTTNG_DOMAIN_PYTHON:
1217 if (!agent_tracing_is_enabled()) {
1218 ret = LTTNG_ERR_AGENT_TRACING_DISABLED;
1219 goto error;
1220 }
1221 /* Fallthrough */
1222 case LTTNG_DOMAIN_UST:
1223 {
1224 if (!ust_app_supported()) {
1225 ret = LTTNG_ERR_NO_UST;
1226 goto error;
1227 }
1228
1229 /* Consumer is in an ERROR state. Report back to client */
1230 if (need_consumerd &&
1231 uatomic_read(&the_ust_consumerd_state) ==
1232 CONSUMER_ERROR) {
1233 ret = LTTNG_ERR_NO_USTCONSUMERD;
1234 goto error;
1235 }
1236
1237 if (need_tracing_session) {
1238 /* Create UST session if none exist. */
1239 if (cmd_ctx->session->ust_session == NULL) {
1240 lttng_domain domain = cmd_ctx->lsm.domain;
1241 ret = create_ust_session(cmd_ctx->session, &domain);
1242 if (ret != LTTNG_OK) {
1243 goto error;
1244 }
1245 }
1246
1247 /* Start the UST consumer daemons */
1248 /* 64-bit */
1249 pthread_mutex_lock(&the_ustconsumer64_data.pid_mutex);
1250 if (the_config.consumerd64_bin_path.value &&
1251 the_ustconsumer64_data.pid == 0 &&
1252 cmd_ctx->lsm.cmd_type != LTTNG_REGISTER_CONSUMER) {
1253 pthread_mutex_unlock(&the_ustconsumer64_data.pid_mutex);
1254 ret = start_consumerd(&the_ustconsumer64_data);
1255 if (ret < 0) {
1256 ret = LTTNG_ERR_UST_CONSUMER64_FAIL;
1257 uatomic_set(&the_ust_consumerd64_fd, -EINVAL);
1258 goto error;
1259 }
1260
1261 uatomic_set(&the_ust_consumerd64_fd, the_ustconsumer64_data.cmd_sock);
1262 uatomic_set(&the_ust_consumerd_state, CONSUMER_STARTED);
1263 } else {
1264 pthread_mutex_unlock(&the_ustconsumer64_data.pid_mutex);
1265 }
1266
1267 /*
1268 * Setup socket for consumer 64 bit. No need for atomic access
1269 * since it was set above and can ONLY be set in this thread.
1270 */
1271 ret = consumer_create_socket(&the_ustconsumer64_data,
1272 cmd_ctx->session->ust_session->consumer);
1273 if (ret < 0) {
1274 goto error;
1275 }
1276
1277 /* 32-bit */
1278 pthread_mutex_lock(&the_ustconsumer32_data.pid_mutex);
1279 if (the_config.consumerd32_bin_path.value &&
1280 the_ustconsumer32_data.pid == 0 &&
1281 cmd_ctx->lsm.cmd_type != LTTNG_REGISTER_CONSUMER) {
1282 pthread_mutex_unlock(&the_ustconsumer32_data.pid_mutex);
1283 ret = start_consumerd(&the_ustconsumer32_data);
1284 if (ret < 0) {
1285 ret = LTTNG_ERR_UST_CONSUMER32_FAIL;
1286 uatomic_set(&the_ust_consumerd32_fd, -EINVAL);
1287 goto error;
1288 }
1289
1290 uatomic_set(&the_ust_consumerd32_fd, the_ustconsumer32_data.cmd_sock);
1291 uatomic_set(&the_ust_consumerd_state, CONSUMER_STARTED);
1292 } else {
1293 pthread_mutex_unlock(&the_ustconsumer32_data.pid_mutex);
1294 }
1295
1296 /*
1297 * Setup socket for consumer 32 bit. No need for atomic access
1298 * since it was set above and can ONLY be set in this thread.
1299 */
1300 ret = consumer_create_socket(&the_ustconsumer32_data,
1301 cmd_ctx->session->ust_session->consumer);
1302 if (ret < 0) {
1303 goto error;
1304 }
1305 }
1306 break;
1307 }
1308 default:
1309 break;
1310 }
1311 skip_domain:
1312
1313 /* Validate consumer daemon state when start/stop trace command */
1314 if (cmd_ctx->lsm.cmd_type == LTTNG_START_TRACE ||
1315 cmd_ctx->lsm.cmd_type == LTTNG_STOP_TRACE) {
1316 switch (cmd_ctx->lsm.domain.type) {
1317 case LTTNG_DOMAIN_NONE:
1318 break;
1319 case LTTNG_DOMAIN_JUL:
1320 case LTTNG_DOMAIN_LOG4J:
1321 case LTTNG_DOMAIN_PYTHON:
1322 case LTTNG_DOMAIN_UST:
1323 if (uatomic_read(&the_ust_consumerd_state) != CONSUMER_STARTED) {
1324 ret = LTTNG_ERR_NO_USTCONSUMERD;
1325 goto error;
1326 }
1327 break;
1328 case LTTNG_DOMAIN_KERNEL:
1329 if (uatomic_read(&the_kernel_consumerd_state) != CONSUMER_STARTED) {
1330 ret = LTTNG_ERR_NO_KERNCONSUMERD;
1331 goto error;
1332 }
1333 break;
1334 default:
1335 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
1336 goto error;
1337 }
1338 }
1339
1340 /*
1341 * Check that the UID matches that of the tracing session.
1342 * The root user can interact with all sessions.
1343 */
1344 if (need_tracing_session) {
1345 if (!session_access_ok(cmd_ctx->session,
1346 LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds)) ||
1347 cmd_ctx->session->destroyed) {
1348 ret = LTTNG_ERR_EPERM;
1349 goto error;
1350 }
1351 }
1352
1353 /*
1354 * Send relayd information to consumer as soon as we have a domain and a
1355 * session defined.
1356 */
1357 if (cmd_ctx->session && need_domain) {
1358 /*
1359 * Setup relayd if not done yet. If the relayd information was already
1360 * sent to the consumer, this call will gracefully return.
1361 */
1362 ret = cmd_setup_relayd(cmd_ctx->session);
1363 if (ret != LTTNG_OK) {
1364 goto error;
1365 }
1366 }
1367
1368 /* Process by command type */
1369 switch (cmd_ctx->lsm.cmd_type) {
1370 case LTTNG_ADD_CONTEXT:
1371 {
1372 struct lttng_event_context *event_context = NULL;
1373 const enum lttng_error_code ret_code =
1374 receive_lttng_event_context(
1375 cmd_ctx, *sock, sock_error, &event_context);
1376
1377 if (ret_code != LTTNG_OK) {
1378 ret = (int) ret_code;
1379 goto error;
1380 }
1381
1382 ret = cmd_add_context(cmd_ctx, event_context, the_kernel_poll_pipe[1]);
1383 lttng_event_context_destroy(event_context);
1384 break;
1385 }
1386 case LTTNG_DISABLE_CHANNEL:
1387 {
1388 ret = cmd_disable_channel(cmd_ctx->session, cmd_ctx->lsm.domain.type,
1389 cmd_ctx->lsm.u.disable.channel_name);
1390 break;
1391 }
1392 case LTTNG_ENABLE_CHANNEL:
1393 {
1394 ret = cmd_enable_channel(
1395 cmd_ctx, *sock, the_kernel_poll_pipe[1]);
1396 break;
1397 }
1398 case LTTNG_PROCESS_ATTR_TRACKER_ADD_INCLUDE_VALUE:
1399 case LTTNG_PROCESS_ATTR_TRACKER_REMOVE_INCLUDE_VALUE:
1400 {
1401 struct lttng_dynamic_buffer payload;
1402 struct lttng_buffer_view payload_view;
1403 const bool add_value =
1404 cmd_ctx->lsm.cmd_type ==
1405 LTTNG_PROCESS_ATTR_TRACKER_ADD_INCLUDE_VALUE;
1406 const size_t name_len =
1407 cmd_ctx->lsm.u.process_attr_tracker_add_remove_include_value
1408 .name_len;
1409 const enum lttng_domain_type domain_type =
1410 (enum lttng_domain_type)
1411 cmd_ctx->lsm.domain.type;
1412 const enum lttng_process_attr process_attr =
1413 (enum lttng_process_attr) cmd_ctx->lsm.u
1414 .process_attr_tracker_add_remove_include_value
1415 .process_attr;
1416 const enum lttng_process_attr_value_type value_type =
1417 (enum lttng_process_attr_value_type) cmd_ctx
1418 ->lsm.u
1419 .process_attr_tracker_add_remove_include_value
1420 .value_type;
1421 struct process_attr_value *value;
1422 enum lttng_error_code ret_code;
1423 long login_name_max;
1424
1425 login_name_max = sysconf(_SC_LOGIN_NAME_MAX);
1426 if (login_name_max < 0) {
1427 PERROR("Failed to get _SC_LOGIN_NAME_MAX system configuration");
1428 ret = LTTNG_ERR_INVALID;
1429 goto error;
1430 }
1431
1432 /* Receive remaining variable length payload if applicable. */
1433 if (name_len > login_name_max) {
1434 /*
1435 * POSIX mandates user and group names that are at least
1436 * 8 characters long. Note that although shadow-utils
1437 * (useradd, groupaadd, etc.) use 32 chars as their
1438 * limit (from bits/utmp.h, UT_NAMESIZE),
1439 * LOGIN_NAME_MAX is defined to 256.
1440 */
1441 ERR("Rejecting process attribute tracker value %s as the provided exceeds the maximal allowed length: argument length = %zu, maximal length = %ld",
1442 add_value ? "addition" : "removal",
1443 name_len, login_name_max);
1444 ret = LTTNG_ERR_INVALID;
1445 goto error;
1446 }
1447
1448 lttng_dynamic_buffer_init(&payload);
1449 if (name_len != 0) {
1450 /*
1451 * Receive variable payload for user/group name
1452 * arguments.
1453 */
1454 ret = lttng_dynamic_buffer_set_size(&payload, name_len);
1455 if (ret) {
1456 ERR("Failed to allocate buffer to receive payload of %s process attribute tracker value argument",
1457 add_value ? "add" : "remove");
1458 ret = LTTNG_ERR_NOMEM;
1459 goto error_add_remove_tracker_value;
1460 }
1461
1462 ret = lttcomm_recv_unix_sock(
1463 *sock, payload.data, name_len);
1464 if (ret <= 0) {
1465 ERR("Failed to receive payload of %s process attribute tracker value argument",
1466 add_value ? "add" : "remove");
1467 *sock_error = 1;
1468 ret = LTTNG_ERR_INVALID_PROTOCOL;
1469 goto error_add_remove_tracker_value;
1470 }
1471 }
1472
1473 payload_view = lttng_buffer_view_from_dynamic_buffer(
1474 &payload, 0, name_len);
1475 if (name_len > 0 && !lttng_buffer_view_is_valid(&payload_view)) {
1476 ret = LTTNG_ERR_INVALID_PROTOCOL;
1477 goto error_add_remove_tracker_value;
1478 }
1479
1480 /*
1481 * Validate the value type and domains are legal for the process
1482 * attribute tracker that is specified and convert the value to
1483 * add/remove to the internal sessiond representation.
1484 */
1485 ret_code = process_attr_value_from_comm(domain_type,
1486 process_attr, value_type,
1487 &cmd_ctx->lsm.u.process_attr_tracker_add_remove_include_value
1488 .integral_value,
1489 &payload_view, &value);
1490 if (ret_code != LTTNG_OK) {
1491 ret = ret_code;
1492 goto error_add_remove_tracker_value;
1493 }
1494
1495 if (add_value) {
1496 ret = cmd_process_attr_tracker_inclusion_set_add_value(
1497 cmd_ctx->session, domain_type,
1498 process_attr, value);
1499 } else {
1500 ret = cmd_process_attr_tracker_inclusion_set_remove_value(
1501 cmd_ctx->session, domain_type,
1502 process_attr, value);
1503 }
1504 process_attr_value_destroy(value);
1505 error_add_remove_tracker_value:
1506 lttng_dynamic_buffer_reset(&payload);
1507 break;
1508 }
1509 case LTTNG_PROCESS_ATTR_TRACKER_GET_POLICY:
1510 {
1511 enum lttng_tracking_policy tracking_policy;
1512 const enum lttng_domain_type domain_type =
1513 (enum lttng_domain_type)
1514 cmd_ctx->lsm.domain.type;
1515 const enum lttng_process_attr process_attr =
1516 (enum lttng_process_attr) cmd_ctx->lsm.u
1517 .process_attr_tracker_get_tracking_policy
1518 .process_attr;
1519
1520 ret = cmd_process_attr_tracker_get_tracking_policy(
1521 cmd_ctx->session, domain_type, process_attr,
1522 &tracking_policy);
1523 if (ret != LTTNG_OK) {
1524 goto error;
1525 }
1526
1527 uint32_t tracking_policy_u32 = tracking_policy;
1528 ret = setup_lttng_msg_no_cmd_header(cmd_ctx,
1529 &tracking_policy_u32, sizeof(uint32_t));
1530 if (ret < 0) {
1531 ret = LTTNG_ERR_NOMEM;
1532 goto error;
1533 }
1534 ret = LTTNG_OK;
1535 break;
1536 }
1537 case LTTNG_PROCESS_ATTR_TRACKER_SET_POLICY:
1538 {
1539 const enum lttng_tracking_policy tracking_policy =
1540 (enum lttng_tracking_policy) cmd_ctx->lsm.u
1541 .process_attr_tracker_set_tracking_policy
1542 .tracking_policy;
1543 const enum lttng_domain_type domain_type =
1544 (enum lttng_domain_type)
1545 cmd_ctx->lsm.domain.type;
1546 const enum lttng_process_attr process_attr =
1547 (enum lttng_process_attr) cmd_ctx->lsm.u
1548 .process_attr_tracker_set_tracking_policy
1549 .process_attr;
1550
1551 ret = cmd_process_attr_tracker_set_tracking_policy(
1552 cmd_ctx->session, domain_type, process_attr,
1553 tracking_policy);
1554 if (ret != LTTNG_OK) {
1555 goto error;
1556 }
1557 break;
1558 }
1559 case LTTNG_PROCESS_ATTR_TRACKER_GET_INCLUSION_SET:
1560 {
1561 struct lttng_process_attr_values *values;
1562 struct lttng_dynamic_buffer reply;
1563 const enum lttng_domain_type domain_type =
1564 (enum lttng_domain_type)
1565 cmd_ctx->lsm.domain.type;
1566 const enum lttng_process_attr process_attr =
1567 (enum lttng_process_attr) cmd_ctx->lsm.u
1568 .process_attr_tracker_get_inclusion_set
1569 .process_attr;
1570
1571 ret = cmd_process_attr_tracker_get_inclusion_set(
1572 cmd_ctx->session, domain_type, process_attr,
1573 &values);
1574 if (ret != LTTNG_OK) {
1575 goto error;
1576 }
1577
1578 lttng_dynamic_buffer_init(&reply);
1579 ret = lttng_process_attr_values_serialize(values, &reply);
1580 if (ret < 0) {
1581 goto error_tracker_get_inclusion_set;
1582 }
1583
1584 ret = setup_lttng_msg_no_cmd_header(
1585 cmd_ctx, reply.data, reply.size);
1586 if (ret < 0) {
1587 ret = LTTNG_ERR_NOMEM;
1588 goto error_tracker_get_inclusion_set;
1589 }
1590 ret = LTTNG_OK;
1591
1592 error_tracker_get_inclusion_set:
1593 lttng_process_attr_values_destroy(values);
1594 lttng_dynamic_buffer_reset(&reply);
1595 break;
1596 }
1597 case LTTNG_ENABLE_EVENT:
1598 case LTTNG_DISABLE_EVENT:
1599 {
1600 struct lttng_event *event;
1601 char *filter_expression;
1602 struct lttng_event_exclusion *exclusions;
1603 struct lttng_bytecode *bytecode;
1604 const enum lttng_error_code ret_code = receive_lttng_event(
1605 cmd_ctx, *sock, sock_error, &event,
1606 &filter_expression, &bytecode, &exclusions);
1607
1608 if (ret_code != LTTNG_OK) {
1609 ret = (int) ret_code;
1610 goto error;
1611 }
1612
1613 /*
1614 * Ownership of filter_expression, exclusions, and bytecode is
1615 * always transferred.
1616 */
1617 ret = cmd_ctx->lsm.cmd_type == LTTNG_ENABLE_EVENT ?
1618 cmd_enable_event(cmd_ctx, event,
1619 filter_expression, exclusions,
1620 bytecode,
1621 the_kernel_poll_pipe[1]) :
1622 cmd_disable_event(cmd_ctx, event,
1623 filter_expression, bytecode,
1624 exclusions);
1625 lttng_event_destroy(event);
1626 break;
1627 }
1628 case LTTNG_LIST_TRACEPOINTS:
1629 {
1630 enum lttng_error_code ret_code;
1631 size_t original_payload_size;
1632 size_t payload_size;
1633 const size_t command_header_size = sizeof(struct lttcomm_list_command_header);
1634
1635 ret = setup_empty_lttng_msg(cmd_ctx);
1636 if (ret) {
1637 ret = LTTNG_ERR_NOMEM;
1638 goto setup_error;
1639 }
1640
1641 original_payload_size = cmd_ctx->reply_payload.buffer.size;
1642
1643 session_lock_list();
1644 ret_code = cmd_list_tracepoints(cmd_ctx->lsm.domain.type,
1645 &cmd_ctx->reply_payload);
1646 session_unlock_list();
1647 if (ret_code != LTTNG_OK) {
1648 ret = (int) ret_code;
1649 goto error;
1650 }
1651
1652 payload_size = cmd_ctx->reply_payload.buffer.size -
1653 command_header_size - original_payload_size;
1654 update_lttng_msg(cmd_ctx, command_header_size, payload_size);
1655
1656 ret = LTTNG_OK;
1657 break;
1658 }
1659 case LTTNG_LIST_TRACEPOINT_FIELDS:
1660 {
1661 enum lttng_error_code ret_code;
1662 size_t original_payload_size;
1663 size_t payload_size;
1664 const size_t command_header_size = sizeof(struct lttcomm_list_command_header);
1665
1666 ret = setup_empty_lttng_msg(cmd_ctx);
1667 if (ret) {
1668 ret = LTTNG_ERR_NOMEM;
1669 goto setup_error;
1670 }
1671
1672 original_payload_size = cmd_ctx->reply_payload.buffer.size;
1673
1674 session_lock_list();
1675 ret_code = cmd_list_tracepoint_fields(
1676 cmd_ctx->lsm.domain.type, &cmd_ctx->reply_payload);
1677 session_unlock_list();
1678 if (ret_code != LTTNG_OK) {
1679 ret = (int) ret_code;
1680 goto error;
1681 }
1682
1683 payload_size = cmd_ctx->reply_payload.buffer.size -
1684 command_header_size - original_payload_size;
1685 update_lttng_msg(cmd_ctx, command_header_size, payload_size);
1686
1687 ret = LTTNG_OK;
1688 break;
1689 }
1690 case LTTNG_LIST_SYSCALLS:
1691 {
1692 enum lttng_error_code ret_code;
1693 size_t original_payload_size;
1694 size_t payload_size;
1695 const size_t command_header_size = sizeof(struct lttcomm_list_command_header);
1696
1697 ret = setup_empty_lttng_msg(cmd_ctx);
1698 if (ret) {
1699 ret = LTTNG_ERR_NOMEM;
1700 goto setup_error;
1701 }
1702
1703 original_payload_size = cmd_ctx->reply_payload.buffer.size;
1704
1705 ret_code = cmd_list_syscalls(&cmd_ctx->reply_payload);
1706 if (ret_code != LTTNG_OK) {
1707 ret = (int) ret_code;
1708 goto error;
1709 }
1710
1711 payload_size = cmd_ctx->reply_payload.buffer.size -
1712 command_header_size - original_payload_size;
1713 update_lttng_msg(cmd_ctx, command_header_size, payload_size);
1714
1715 ret = LTTNG_OK;
1716 break;
1717 }
1718 case LTTNG_SET_CONSUMER_URI:
1719 {
1720 size_t nb_uri, len;
1721 struct lttng_uri *uris;
1722
1723 nb_uri = cmd_ctx->lsm.u.uri.size;
1724 len = nb_uri * sizeof(struct lttng_uri);
1725
1726 if (nb_uri == 0) {
1727 ret = LTTNG_ERR_INVALID;
1728 goto error;
1729 }
1730
1731 uris = calloc<lttng_uri>(nb_uri);
1732 if (uris == NULL) {
1733 ret = LTTNG_ERR_FATAL;
1734 goto error;
1735 }
1736
1737 /* Receive variable len data */
1738 DBG("Receiving %zu URI(s) from client ...", nb_uri);
1739 ret = lttcomm_recv_unix_sock(*sock, uris, len);
1740 if (ret <= 0) {
1741 DBG("No URIs received from client... continuing");
1742 *sock_error = 1;
1743 ret = LTTNG_ERR_SESSION_FAIL;
1744 free(uris);
1745 goto error;
1746 }
1747
1748 ret = cmd_set_consumer_uri(cmd_ctx->session, nb_uri, uris);
1749 free(uris);
1750 if (ret != LTTNG_OK) {
1751 goto error;
1752 }
1753
1754
1755 break;
1756 }
1757 case LTTNG_START_TRACE:
1758 {
1759 /*
1760 * On the first start, if we have a kernel session and we have
1761 * enabled time or size-based rotations, we have to make sure
1762 * the kernel tracer supports it.
1763 */
1764 if (!cmd_ctx->session->has_been_started && \
1765 cmd_ctx->session->kernel_session && \
1766 (cmd_ctx->session->rotate_timer_period || \
1767 cmd_ctx->session->rotate_size) && \
1768 !check_rotate_compatible()) {
1769 DBG("Kernel tracer version is not compatible with the rotation feature");
1770 ret = LTTNG_ERR_ROTATION_WRONG_VERSION;
1771 goto error;
1772 }
1773 ret = cmd_start_trace(cmd_ctx->session);
1774 break;
1775 }
1776 case LTTNG_STOP_TRACE:
1777 {
1778 ret = cmd_stop_trace(cmd_ctx->session);
1779 break;
1780 }
1781 case LTTNG_DESTROY_SESSION:
1782 {
1783 ret = cmd_destroy_session(cmd_ctx->session,
1784 the_notification_thread_handle, sock);
1785 break;
1786 }
1787 case LTTNG_LIST_DOMAINS:
1788 {
1789 ssize_t nb_dom;
1790 struct lttng_domain *domains = NULL;
1791
1792 nb_dom = cmd_list_domains(cmd_ctx->session, &domains);
1793 if (nb_dom < 0) {
1794 /* Return value is a negative lttng_error_code. */
1795 ret = -nb_dom;
1796 goto error;
1797 }
1798
1799 ret = setup_lttng_msg_no_cmd_header(cmd_ctx, domains,
1800 nb_dom * sizeof(struct lttng_domain));
1801 free(domains);
1802
1803 if (ret < 0) {
1804 goto setup_error;
1805 }
1806
1807 ret = LTTNG_OK;
1808 break;
1809 }
1810 case LTTNG_LIST_CHANNELS:
1811 {
1812 enum lttng_error_code ret_code;
1813 size_t original_payload_size;
1814 size_t payload_size;
1815 const size_t command_header_size = sizeof(struct lttcomm_list_command_header);
1816
1817 ret = setup_empty_lttng_msg(cmd_ctx);
1818 if (ret) {
1819 ret = LTTNG_ERR_NOMEM;
1820 goto setup_error;
1821 }
1822
1823 original_payload_size = cmd_ctx->reply_payload.buffer.size;
1824
1825 ret_code = cmd_list_channels(cmd_ctx->lsm.domain.type,
1826 cmd_ctx->session, &cmd_ctx->reply_payload);
1827 if (ret_code != LTTNG_OK) {
1828 ret = (int) ret_code;
1829 goto error;
1830 }
1831
1832 payload_size = cmd_ctx->reply_payload.buffer.size -
1833 command_header_size - original_payload_size;
1834 update_lttng_msg(cmd_ctx, command_header_size, payload_size);
1835
1836 ret = LTTNG_OK;
1837 break;
1838 }
1839 case LTTNG_LIST_EVENTS:
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_events(cmd_ctx->lsm.domain.type,
1855 cmd_ctx->session,
1856 cmd_ctx->lsm.u.list.channel_name, &cmd_ctx->reply_payload);
1857 if (ret_code != LTTNG_OK) {
1858 ret = (int) ret_code;
1859 goto error;
1860 }
1861
1862 payload_size = cmd_ctx->reply_payload.buffer.size -
1863 command_header_size - original_payload_size;
1864 update_lttng_msg(cmd_ctx, command_header_size, payload_size);
1865
1866 ret = LTTNG_OK;
1867 break;
1868 }
1869 case LTTNG_LIST_SESSIONS:
1870 {
1871 enum lttng_error_code ret_code;
1872 size_t original_payload_size;
1873 size_t payload_size;
1874 const size_t command_header_size = sizeof(struct lttcomm_list_command_header);
1875
1876 ret = setup_empty_lttng_msg(cmd_ctx);
1877 if (ret) {
1878 ret = LTTNG_ERR_NOMEM;
1879 goto setup_error;
1880 }
1881
1882 original_payload_size = cmd_ctx->reply_payload.buffer.size;
1883
1884 session_lock_list();
1885 ret_code = cmd_list_lttng_sessions(&cmd_ctx->reply_payload,
1886 LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds),
1887 LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds));
1888 session_unlock_list();
1889 if (ret_code != LTTNG_OK) {
1890 ret = (int) ret_code;
1891 goto error;
1892 }
1893
1894 payload_size = cmd_ctx->reply_payload.buffer.size - command_header_size -
1895 original_payload_size;
1896 update_lttng_msg(cmd_ctx, command_header_size, payload_size);
1897
1898 ret = LTTNG_OK;
1899 break;
1900 }
1901 case LTTNG_REGISTER_CONSUMER:
1902 {
1903 struct consumer_data *cdata;
1904
1905 switch (cmd_ctx->lsm.domain.type) {
1906 case LTTNG_DOMAIN_KERNEL:
1907 cdata = &the_kconsumer_data;
1908 break;
1909 default:
1910 ret = LTTNG_ERR_UND;
1911 goto error;
1912 }
1913
1914 ret = cmd_register_consumer(cmd_ctx->session, cmd_ctx->lsm.domain.type,
1915 cmd_ctx->lsm.u.reg.path, cdata);
1916 break;
1917 }
1918 case LTTNG_DATA_PENDING:
1919 {
1920 int pending_ret;
1921 uint8_t pending_ret_byte;
1922
1923 pending_ret = cmd_data_pending(cmd_ctx->session);
1924
1925 /*
1926 * FIXME
1927 *
1928 * This function may returns 0 or 1 to indicate whether or not
1929 * there is data pending. In case of error, it should return an
1930 * LTTNG_ERR code. However, some code paths may still return
1931 * a nondescript error code, which we handle by returning an
1932 * "unknown" error.
1933 */
1934 if (pending_ret == 0 || pending_ret == 1) {
1935 /*
1936 * ret will be set to LTTNG_OK at the end of
1937 * this function.
1938 */
1939 } else if (pending_ret < 0) {
1940 ret = LTTNG_ERR_UNK;
1941 goto setup_error;
1942 } else {
1943 ret = pending_ret;
1944 goto setup_error;
1945 }
1946
1947 pending_ret_byte = (uint8_t) pending_ret;
1948
1949 /* 1 byte to return whether or not data is pending */
1950 ret = setup_lttng_msg_no_cmd_header(cmd_ctx,
1951 &pending_ret_byte, 1);
1952
1953 if (ret < 0) {
1954 goto setup_error;
1955 }
1956
1957 ret = LTTNG_OK;
1958 break;
1959 }
1960 case LTTNG_SNAPSHOT_ADD_OUTPUT:
1961 {
1962 uint32_t snapshot_id;
1963 struct lttcomm_lttng_output_id reply;
1964 lttng_snapshot_output output = cmd_ctx->lsm.u.snapshot_output.output;
1965
1966 ret = cmd_snapshot_add_output(cmd_ctx->session,
1967 &output,
1968 &snapshot_id);
1969 if (ret != LTTNG_OK) {
1970 goto error;
1971 }
1972 reply.id = snapshot_id;
1973
1974 ret = setup_lttng_msg_no_cmd_header(cmd_ctx, &reply,
1975 sizeof(reply));
1976 if (ret < 0) {
1977 goto setup_error;
1978 }
1979
1980 /* Copy output list into message payload */
1981 ret = LTTNG_OK;
1982 break;
1983 }
1984 case LTTNG_SNAPSHOT_DEL_OUTPUT:
1985 {
1986 lttng_snapshot_output output = cmd_ctx->lsm.u.snapshot_output.output;
1987 ret = cmd_snapshot_del_output(cmd_ctx->session, &output);
1988 break;
1989 }
1990 case LTTNG_SNAPSHOT_LIST_OUTPUT:
1991 {
1992 ssize_t nb_output;
1993 struct lttng_snapshot_output *outputs = NULL;
1994
1995 nb_output = cmd_snapshot_list_outputs(cmd_ctx->session, &outputs);
1996 if (nb_output < 0) {
1997 ret = -nb_output;
1998 goto error;
1999 }
2000
2001 LTTNG_ASSERT((nb_output > 0 && outputs) || nb_output == 0);
2002 ret = setup_lttng_msg_no_cmd_header(cmd_ctx, outputs,
2003 nb_output * sizeof(struct lttng_snapshot_output));
2004 free(outputs);
2005
2006 if (ret < 0) {
2007 goto setup_error;
2008 }
2009
2010 ret = LTTNG_OK;
2011 break;
2012 }
2013 case LTTNG_SNAPSHOT_RECORD:
2014 {
2015 lttng_snapshot_output output = cmd_ctx->lsm.u.snapshot_record.output;
2016 ret = cmd_snapshot_record(cmd_ctx->session,
2017 &output, 0); // RFC: set to zero since it's ignored by cmd_snapshot_record
2018 break;
2019 }
2020 case LTTNG_CREATE_SESSION_EXT:
2021 {
2022 struct lttng_payload payload;
2023 struct lttng_session_descriptor *return_descriptor = NULL;
2024
2025 lttng_payload_init(&payload);
2026 ret = cmd_create_session(cmd_ctx, *sock, &return_descriptor);
2027 if (ret != LTTNG_OK) {
2028 goto error;
2029 }
2030
2031 ret = lttng_session_descriptor_serialize(return_descriptor,
2032 &payload);
2033 if (ret) {
2034 ERR("Failed to serialize session descriptor in reply to \"create session\" command");
2035 lttng_session_descriptor_destroy(return_descriptor);
2036 ret = LTTNG_ERR_NOMEM;
2037 goto error;
2038 }
2039 ret = setup_lttng_msg_no_cmd_header(
2040 cmd_ctx, payload.buffer.data, payload.buffer.size);
2041 if (ret) {
2042 lttng_session_descriptor_destroy(return_descriptor);
2043 ret = LTTNG_ERR_NOMEM;
2044 goto error;
2045 }
2046 lttng_payload_reset(&payload);
2047 lttng_session_descriptor_destroy(return_descriptor);
2048 ret = LTTNG_OK;
2049 break;
2050 }
2051 case LTTNG_SAVE_SESSION:
2052 {
2053 ret = cmd_save_sessions(&cmd_ctx->lsm.u.save_session.attr,
2054 &cmd_ctx->creds);
2055 break;
2056 }
2057 case LTTNG_SET_SESSION_SHM_PATH:
2058 {
2059 ret = cmd_set_session_shm_path(cmd_ctx->session,
2060 cmd_ctx->lsm.u.set_shm_path.shm_path);
2061 break;
2062 }
2063 case LTTNG_REGENERATE_METADATA:
2064 {
2065 ret = cmd_regenerate_metadata(cmd_ctx->session);
2066 break;
2067 }
2068 case LTTNG_REGENERATE_STATEDUMP:
2069 {
2070 ret = cmd_regenerate_statedump(cmd_ctx->session);
2071 break;
2072 }
2073 case LTTNG_REGISTER_TRIGGER:
2074 {
2075 struct lttng_trigger *payload_trigger;
2076 struct lttng_trigger *return_trigger;
2077 size_t original_reply_payload_size;
2078 size_t reply_payload_size;
2079 const struct lttng_credentials cmd_creds = {
2080 .uid = LTTNG_OPTIONAL_INIT_VALUE(cmd_ctx->creds.uid),
2081 .gid = LTTNG_OPTIONAL_INIT_VALUE(cmd_ctx->creds.gid),
2082 };
2083
2084 ret = setup_empty_lttng_msg(cmd_ctx);
2085 if (ret) {
2086 ret = LTTNG_ERR_NOMEM;
2087 goto setup_error;
2088 }
2089
2090 ret = receive_lttng_trigger(
2091 cmd_ctx, *sock, sock_error, &payload_trigger);
2092 if (ret != LTTNG_OK) {
2093 goto error;
2094 }
2095
2096 original_reply_payload_size = cmd_ctx->reply_payload.buffer.size;
2097
2098 ret = cmd_register_trigger(&cmd_creds, payload_trigger,
2099 cmd_ctx->lsm.u.trigger.is_trigger_anonymous,
2100 the_notification_thread_handle,
2101 &return_trigger);
2102 if (ret != LTTNG_OK) {
2103 lttng_trigger_put(payload_trigger);
2104 goto error;
2105 }
2106
2107 ret = lttng_trigger_serialize(return_trigger, &cmd_ctx->reply_payload);
2108 lttng_trigger_put(payload_trigger);
2109 lttng_trigger_put(return_trigger);
2110 if (ret) {
2111 ERR("Failed to serialize trigger in reply to \"register trigger\" command");
2112 ret = LTTNG_ERR_NOMEM;
2113 goto error;
2114 }
2115
2116 reply_payload_size = cmd_ctx->reply_payload.buffer.size -
2117 original_reply_payload_size;
2118
2119 update_lttng_msg(cmd_ctx, 0, reply_payload_size);
2120
2121 ret = LTTNG_OK;
2122 break;
2123 }
2124 case LTTNG_UNREGISTER_TRIGGER:
2125 {
2126 struct lttng_trigger *payload_trigger;
2127 const struct lttng_credentials cmd_creds = {
2128 .uid = LTTNG_OPTIONAL_INIT_VALUE(cmd_ctx->creds.uid),
2129 .gid = LTTNG_OPTIONAL_INIT_VALUE(cmd_ctx->creds.gid),
2130 };
2131
2132 ret = receive_lttng_trigger(
2133 cmd_ctx, *sock, sock_error, &payload_trigger);
2134 if (ret != LTTNG_OK) {
2135 goto error;
2136 }
2137
2138 ret = cmd_unregister_trigger(&cmd_creds, payload_trigger,
2139 the_notification_thread_handle);
2140 lttng_trigger_put(payload_trigger);
2141 break;
2142 }
2143 case LTTNG_ROTATE_SESSION:
2144 {
2145 struct lttng_rotate_session_return rotate_return;
2146
2147 DBG("Client rotate session \"%s\"", cmd_ctx->session->name);
2148
2149 memset(&rotate_return, 0, sizeof(rotate_return));
2150 if (cmd_ctx->session->kernel_session && !check_rotate_compatible()) {
2151 DBG("Kernel tracer version is not compatible with the rotation feature");
2152 ret = LTTNG_ERR_ROTATION_WRONG_VERSION;
2153 goto error;
2154 }
2155
2156 ret = cmd_rotate_session(cmd_ctx->session, &rotate_return,
2157 false,
2158 LTTNG_TRACE_CHUNK_COMMAND_TYPE_MOVE_TO_COMPLETED);
2159 if (ret < 0) {
2160 ret = -ret;
2161 goto error;
2162 }
2163
2164 ret = setup_lttng_msg_no_cmd_header(cmd_ctx, &rotate_return,
2165 sizeof(rotate_return));
2166 if (ret < 0) {
2167 ret = -ret;
2168 goto error;
2169 }
2170
2171 ret = LTTNG_OK;
2172 break;
2173 }
2174 case LTTNG_ROTATION_GET_INFO:
2175 {
2176 struct lttng_rotation_get_info_return get_info_return;
2177
2178 memset(&get_info_return, 0, sizeof(get_info_return));
2179 ret = cmd_rotate_get_info(cmd_ctx->session, &get_info_return,
2180 cmd_ctx->lsm.u.get_rotation_info.rotation_id);
2181 if (ret < 0) {
2182 ret = -ret;
2183 goto error;
2184 }
2185
2186 ret = setup_lttng_msg_no_cmd_header(cmd_ctx, &get_info_return,
2187 sizeof(get_info_return));
2188 if (ret < 0) {
2189 ret = -ret;
2190 goto error;
2191 }
2192
2193 ret = LTTNG_OK;
2194 break;
2195 }
2196 case LTTNG_ROTATION_SET_SCHEDULE:
2197 {
2198 bool set_schedule;
2199 enum lttng_rotation_schedule_type schedule_type;
2200 uint64_t value;
2201
2202 if (cmd_ctx->session->kernel_session && !check_rotate_compatible()) {
2203 DBG("Kernel tracer version does not support session rotations");
2204 ret = LTTNG_ERR_ROTATION_WRONG_VERSION;
2205 goto error;
2206 }
2207
2208 set_schedule = cmd_ctx->lsm.u.rotation_set_schedule.set == 1;
2209 schedule_type = (enum lttng_rotation_schedule_type) cmd_ctx->lsm.u.rotation_set_schedule.type;
2210 value = cmd_ctx->lsm.u.rotation_set_schedule.value;
2211
2212 ret = cmd_rotation_set_schedule(cmd_ctx->session, set_schedule,
2213 schedule_type, value,
2214 the_notification_thread_handle);
2215 if (ret != LTTNG_OK) {
2216 goto error;
2217 }
2218
2219 break;
2220 }
2221 case LTTNG_SESSION_LIST_ROTATION_SCHEDULES:
2222 {
2223 lttng_session_list_schedules_return schedules;
2224
2225 schedules.periodic.set = !!cmd_ctx->session->rotate_timer_period;
2226 schedules.periodic.value = cmd_ctx->session->rotate_timer_period;
2227 schedules.size.set = !!cmd_ctx->session->rotate_size;
2228 schedules.size.value = cmd_ctx->session->rotate_size;
2229
2230 ret = setup_lttng_msg_no_cmd_header(cmd_ctx, &schedules,
2231 sizeof(schedules));
2232 if (ret < 0) {
2233 ret = -ret;
2234 goto error;
2235 }
2236
2237 ret = LTTNG_OK;
2238 break;
2239 }
2240 case LTTNG_CLEAR_SESSION:
2241 {
2242 ret = cmd_clear_session(cmd_ctx->session, sock);
2243 break;
2244 }
2245 case LTTNG_LIST_TRIGGERS:
2246 {
2247 struct lttng_triggers *return_triggers = NULL;
2248 size_t original_payload_size;
2249 size_t payload_size;
2250
2251 ret = setup_empty_lttng_msg(cmd_ctx);
2252 if (ret) {
2253 ret = LTTNG_ERR_NOMEM;
2254 goto setup_error;
2255 }
2256
2257 original_payload_size = cmd_ctx->reply_payload.buffer.size;
2258
2259 ret = cmd_list_triggers(cmd_ctx, the_notification_thread_handle,
2260 &return_triggers);
2261 if (ret != LTTNG_OK) {
2262 goto error;
2263 }
2264
2265 LTTNG_ASSERT(return_triggers);
2266 ret = lttng_triggers_serialize(
2267 return_triggers, &cmd_ctx->reply_payload);
2268 lttng_triggers_destroy(return_triggers);
2269 if (ret) {
2270 ERR("Failed to serialize triggers in reply to `list triggers` command");
2271 ret = LTTNG_ERR_NOMEM;
2272 goto error;
2273 }
2274
2275 payload_size = cmd_ctx->reply_payload.buffer.size -
2276 original_payload_size;
2277
2278 update_lttng_msg(cmd_ctx, 0, payload_size);
2279
2280 ret = LTTNG_OK;
2281 break;
2282 }
2283 case LTTNG_EXECUTE_ERROR_QUERY:
2284 {
2285 struct lttng_error_query *query;
2286 const struct lttng_credentials cmd_creds = {
2287 .uid = LTTNG_OPTIONAL_INIT_VALUE(cmd_ctx->creds.uid),
2288 .gid = LTTNG_OPTIONAL_INIT_VALUE(cmd_ctx->creds.gid),
2289 };
2290 struct lttng_error_query_results *results = NULL;
2291 size_t original_payload_size;
2292 size_t payload_size;
2293
2294 ret = setup_empty_lttng_msg(cmd_ctx);
2295 if (ret) {
2296 ret = LTTNG_ERR_NOMEM;
2297 goto setup_error;
2298 }
2299
2300 original_payload_size = cmd_ctx->reply_payload.buffer.size;
2301
2302 ret = receive_lttng_error_query(
2303 cmd_ctx, *sock, sock_error, &query);
2304 if (ret != LTTNG_OK) {
2305 goto error;
2306 }
2307
2308 ret = cmd_execute_error_query(&cmd_creds, query, &results,
2309 the_notification_thread_handle);
2310 lttng_error_query_destroy(query);
2311 if (ret != LTTNG_OK) {
2312 goto error;
2313 }
2314
2315 LTTNG_ASSERT(results);
2316 ret = lttng_error_query_results_serialize(
2317 results, &cmd_ctx->reply_payload);
2318 lttng_error_query_results_destroy(results);
2319 if (ret) {
2320 ERR("Failed to serialize error query result set in reply to `execute error query` command");
2321 ret = LTTNG_ERR_NOMEM;
2322 goto error;
2323 }
2324
2325 payload_size = cmd_ctx->reply_payload.buffer.size -
2326 original_payload_size;
2327
2328 update_lttng_msg(cmd_ctx, 0, payload_size);
2329
2330 ret = LTTNG_OK;
2331
2332 break;
2333 }
2334 default:
2335 ret = LTTNG_ERR_UND;
2336 break;
2337 }
2338
2339 error:
2340 if (cmd_ctx->reply_payload.buffer.size == 0) {
2341 DBG("Missing llm header, creating one.");
2342 if (setup_lttng_msg_no_cmd_header(cmd_ctx, NULL, 0) < 0) {
2343 goto setup_error;
2344 }
2345 }
2346 /* Set return code */
2347 ((struct lttcomm_lttng_msg *) (cmd_ctx->reply_payload.buffer.data))->ret_code = ret;
2348 setup_error:
2349 if (cmd_ctx->session) {
2350 session_unlock(cmd_ctx->session);
2351 session_put(cmd_ctx->session);
2352 cmd_ctx->session = NULL;
2353 }
2354 if (need_tracing_session) {
2355 session_unlock_list();
2356 }
2357 init_setup_error:
2358 LTTNG_ASSERT(!rcu_read_ongoing());
2359 return ret;
2360 }
2361
2362 static int create_client_sock(void)
2363 {
2364 int ret, client_sock;
2365 const mode_t old_umask = umask(0);
2366
2367 /* Create client tool unix socket */
2368 client_sock = lttcomm_create_unix_sock(
2369 the_config.client_unix_sock_path.value);
2370 if (client_sock < 0) {
2371 ERR("Create unix sock failed: %s",
2372 the_config.client_unix_sock_path.value);
2373 ret = -1;
2374 goto end;
2375 }
2376
2377 /* Set the cloexec flag */
2378 ret = utils_set_fd_cloexec(client_sock);
2379 if (ret < 0) {
2380 ERR("Unable to set CLOEXEC flag to the client Unix socket (fd: %d). "
2381 "Continuing but note that the consumer daemon will have a "
2382 "reference to this socket on exec()", client_sock);
2383 }
2384
2385 /* File permission MUST be 660 */
2386 ret = chmod(the_config.client_unix_sock_path.value,
2387 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
2388 if (ret < 0) {
2389 ERR("Set file permissions failed: %s",
2390 the_config.client_unix_sock_path.value);
2391 PERROR("chmod");
2392 (void) lttcomm_close_unix_sock(client_sock);
2393 ret = -1;
2394 goto end;
2395 }
2396 DBG("Created client socket (fd = %i)", client_sock);
2397 ret = client_sock;
2398 end:
2399 umask(old_umask);
2400 return ret;
2401 }
2402
2403 static void cleanup_client_thread(void *data)
2404 {
2405 struct lttng_pipe *quit_pipe = (lttng_pipe *) data;
2406
2407 lttng_pipe_destroy(quit_pipe);
2408 }
2409
2410 static void thread_init_cleanup(void *data __attribute__((unused)))
2411 {
2412 set_thread_status(false);
2413 }
2414
2415 /*
2416 * This thread manage all clients request using the unix client socket for
2417 * communication.
2418 */
2419 static void *thread_manage_clients(void *data)
2420 {
2421 int sock = -1, ret, i, pollfd, err = -1;
2422 int sock_error;
2423 uint32_t revents, nb_fd;
2424 struct lttng_poll_event events;
2425 const int client_sock = thread_state.client_sock;
2426 struct lttng_pipe *quit_pipe = (lttng_pipe *) data;
2427 const int thread_quit_pipe_fd = lttng_pipe_get_readfd(quit_pipe);
2428 struct command_ctx cmd_ctx = {};
2429
2430 DBG("[thread] Manage client started");
2431
2432 lttng_payload_init(&cmd_ctx.reply_payload);
2433
2434 is_root = (getuid() == 0);
2435
2436 pthread_cleanup_push(thread_init_cleanup, NULL);
2437
2438 rcu_register_thread();
2439
2440 health_register(the_health_sessiond, HEALTH_SESSIOND_TYPE_CMD);
2441
2442 health_code_update();
2443
2444 ret = lttcomm_listen_unix_sock(client_sock);
2445 if (ret < 0) {
2446 goto error_listen;
2447 }
2448
2449 /*
2450 * Pass 2 as size here for the thread quit pipe and client_sock. Nothing
2451 * more will be added to this poll set.
2452 */
2453 ret = lttng_poll_create(&events, 2, LTTNG_CLOEXEC);
2454 if (ret < 0) {
2455 goto error_create_poll;
2456 }
2457
2458 /* Add the application registration socket */
2459 ret = lttng_poll_add(&events, client_sock, LPOLLIN | LPOLLPRI);
2460 if (ret < 0) {
2461 goto error;
2462 }
2463
2464 /* Add thread quit pipe */
2465 ret = lttng_poll_add(&events, thread_quit_pipe_fd, LPOLLIN | LPOLLERR);
2466 if (ret < 0) {
2467 goto error;
2468 }
2469
2470 /* Set state as running. */
2471 set_thread_status(true);
2472 pthread_cleanup_pop(0);
2473
2474 /* This testpoint is after we signal readiness to the parent. */
2475 if (testpoint(sessiond_thread_manage_clients)) {
2476 goto error;
2477 }
2478
2479 if (testpoint(sessiond_thread_manage_clients_before_loop)) {
2480 goto error;
2481 }
2482
2483 health_code_update();
2484
2485 while (1) {
2486 const struct cmd_completion_handler *cmd_completion_handler;
2487
2488 cmd_ctx.creds.uid = UINT32_MAX;
2489 cmd_ctx.creds.gid = UINT32_MAX;
2490 cmd_ctx.creds.pid = 0;
2491 cmd_ctx.session = NULL;
2492 lttng_payload_clear(&cmd_ctx.reply_payload);
2493 cmd_ctx.lttng_msg_size = 0;
2494
2495 DBG("Accepting client command ...");
2496
2497 /* Inifinite blocking call, waiting for transmission */
2498 restart:
2499 health_poll_entry();
2500 ret = lttng_poll_wait(&events, -1);
2501 health_poll_exit();
2502 if (ret < 0) {
2503 /*
2504 * Restart interrupted system call.
2505 */
2506 if (errno == EINTR) {
2507 goto restart;
2508 }
2509 goto error;
2510 }
2511
2512 nb_fd = ret;
2513
2514 for (i = 0; i < nb_fd; i++) {
2515 revents = LTTNG_POLL_GETEV(&events, i);
2516 pollfd = LTTNG_POLL_GETFD(&events, i);
2517
2518 health_code_update();
2519
2520 if (pollfd == thread_quit_pipe_fd) {
2521 err = 0;
2522 goto exit;
2523 } else {
2524 /* Event on the registration socket */
2525 if (revents & LPOLLIN) {
2526 continue;
2527 } else if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
2528 ERR("Client socket poll error");
2529 goto error;
2530 } else {
2531 ERR("Unexpected poll events %u for sock %d", revents, pollfd);
2532 goto error;
2533 }
2534 }
2535 }
2536
2537 DBG("Wait for client response");
2538
2539 health_code_update();
2540
2541 sock = lttcomm_accept_unix_sock(client_sock);
2542 if (sock < 0) {
2543 goto error;
2544 }
2545
2546 /*
2547 * Set the CLOEXEC flag. Return code is useless because either way, the
2548 * show must go on.
2549 */
2550 (void) utils_set_fd_cloexec(sock);
2551
2552 /* Set socket option for credentials retrieval */
2553 ret = lttcomm_setsockopt_creds_unix_sock(sock);
2554 if (ret < 0) {
2555 goto error;
2556 }
2557
2558 health_code_update();
2559
2560 /*
2561 * Data is received from the lttng client. The struct
2562 * lttcomm_session_msg (lsm) contains the command and data request of
2563 * the client.
2564 */
2565 DBG("Receiving data from client ...");
2566 ret = lttcomm_recv_creds_unix_sock(sock, &cmd_ctx.lsm,
2567 sizeof(struct lttcomm_session_msg), &cmd_ctx.creds);
2568 if (ret != sizeof(struct lttcomm_session_msg)) {
2569 DBG("Incomplete recv() from client... continuing");
2570 ret = close(sock);
2571 if (ret) {
2572 PERROR("close");
2573 }
2574 sock = -1;
2575 continue;
2576 }
2577
2578 health_code_update();
2579
2580 // TODO: Validate cmd_ctx including sanity check for
2581 // security purpose.
2582
2583 rcu_thread_online();
2584 /*
2585 * This function dispatch the work to the kernel or userspace tracer
2586 * libs and fill the lttcomm_lttng_msg data structure of all the needed
2587 * informations for the client. The command context struct contains
2588 * everything this function may needs.
2589 */
2590 ret = process_client_msg(&cmd_ctx, &sock, &sock_error);
2591 rcu_thread_offline();
2592 if (ret < 0) {
2593 if (sock >= 0) {
2594 ret = close(sock);
2595 if (ret) {
2596 PERROR("close");
2597 }
2598 }
2599 sock = -1;
2600 /*
2601 * TODO: Inform client somehow of the fatal error. At
2602 * this point, ret < 0 means that a zmalloc failed
2603 * (ENOMEM). Error detected but still accept
2604 * command, unless a socket error has been
2605 * detected.
2606 */
2607 continue;
2608 }
2609
2610 if (ret < LTTNG_OK || ret >= LTTNG_ERR_NR) {
2611 WARN("Command returned an invalid status code, returning unknown error: "
2612 "command type = %s (%d), ret = %d",
2613 lttcomm_sessiond_command_str((lttcomm_sessiond_command) cmd_ctx.lsm.cmd_type),
2614 cmd_ctx.lsm.cmd_type, ret);
2615 ret = LTTNG_ERR_UNK;
2616 }
2617
2618 cmd_completion_handler = cmd_pop_completion_handler();
2619 if (cmd_completion_handler) {
2620 enum lttng_error_code completion_code;
2621
2622 completion_code = cmd_completion_handler->run(
2623 cmd_completion_handler->data);
2624 if (completion_code != LTTNG_OK) {
2625 continue;
2626 }
2627 }
2628
2629 health_code_update();
2630
2631 if (sock >= 0) {
2632 struct lttng_payload_view view =
2633 lttng_payload_view_from_payload(
2634 &cmd_ctx.reply_payload,
2635 0, -1);
2636 struct lttcomm_lttng_msg *llm = (typeof(
2637 llm)) cmd_ctx.reply_payload.buffer.data;
2638
2639 LTTNG_ASSERT(cmd_ctx.reply_payload.buffer.size >= sizeof(*llm));
2640 LTTNG_ASSERT(cmd_ctx.lttng_msg_size == cmd_ctx.reply_payload.buffer.size);
2641
2642 llm->fd_count = lttng_payload_view_get_fd_handle_count(&view);
2643
2644 DBG("Sending response (size: %d, retcode: %s (%d))",
2645 cmd_ctx.lttng_msg_size,
2646 lttng_strerror(-llm->ret_code),
2647 llm->ret_code);
2648 ret = send_unix_sock(sock, &view);
2649 if (ret < 0) {
2650 ERR("Failed to send data back to client");
2651 }
2652
2653 /* End of transmission */
2654 ret = close(sock);
2655 if (ret) {
2656 PERROR("close");
2657 }
2658 }
2659 sock = -1;
2660
2661 health_code_update();
2662 }
2663
2664 exit:
2665 error:
2666 if (sock >= 0) {
2667 ret = close(sock);
2668 if (ret) {
2669 PERROR("close");
2670 }
2671 }
2672
2673 lttng_poll_clean(&events);
2674
2675 error_listen:
2676 error_create_poll:
2677 unlink(the_config.client_unix_sock_path.value);
2678 ret = close(client_sock);
2679 if (ret) {
2680 PERROR("close");
2681 }
2682
2683 if (err) {
2684 health_error();
2685 ERR("Health error occurred in %s", __func__);
2686 }
2687
2688 health_unregister(the_health_sessiond);
2689
2690 DBG("Client thread dying");
2691 lttng_payload_reset(&cmd_ctx.reply_payload);
2692 rcu_unregister_thread();
2693 return NULL;
2694 }
2695
2696 static
2697 bool shutdown_client_thread(void *thread_data)
2698 {
2699 struct lttng_pipe *client_quit_pipe = (lttng_pipe *) thread_data;
2700 const int write_fd = lttng_pipe_get_writefd(client_quit_pipe);
2701
2702 return notify_thread_pipe(write_fd) == 1;
2703 }
2704
2705 struct lttng_thread *launch_client_thread(void)
2706 {
2707 bool thread_running;
2708 struct lttng_pipe *client_quit_pipe;
2709 struct lttng_thread *thread = NULL;
2710 int client_sock_fd = -1;
2711
2712 sem_init(&thread_state.ready, 0, 0);
2713 client_quit_pipe = lttng_pipe_open(FD_CLOEXEC);
2714 if (!client_quit_pipe) {
2715 goto error;
2716 }
2717
2718 client_sock_fd = create_client_sock();
2719 if (client_sock_fd < 0) {
2720 goto error;
2721 }
2722
2723 thread_state.client_sock = client_sock_fd;
2724 thread = lttng_thread_create("Client management",
2725 thread_manage_clients,
2726 shutdown_client_thread,
2727 cleanup_client_thread,
2728 client_quit_pipe);
2729 if (!thread) {
2730 goto error;
2731 }
2732 /* The client thread now owns the client sock fd and the quit pipe. */
2733 client_sock_fd = -1;
2734 client_quit_pipe = NULL;
2735
2736 /*
2737 * This thread is part of the threads that need to be fully
2738 * initialized before the session daemon is marked as "ready".
2739 */
2740 thread_running = wait_thread_status();
2741 if (!thread_running) {
2742 goto error;
2743 }
2744 return thread;
2745 error:
2746 if (client_sock_fd >= 0) {
2747 if (close(client_sock_fd)) {
2748 PERROR("Failed to close client socket");
2749 }
2750 }
2751 lttng_thread_put(thread);
2752 cleanup_client_thread(client_quit_pipe);
2753 return NULL;
2754 }
LTTng tools - Deliverables
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