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37ea0509a2c3a71b8897b30d24a77b0859ff5064
[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 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 lttcomm_lttng_msg llm {};
91
92 llm.cmd_type = cmd_ctx->lsm.cmd_type;
93 llm.pid = (uint32_t) cmd_ctx->lsm.domain.attr.pid;
94 llm.cmd_header_size = (uint32_t) cmd_header_len;
95 llm.data_size = (uint32_t) payload_len;
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 struct lttcomm_lttng_msg *p_llm;
165 lttcomm_lttng_msg llm {};
166
167 llm.cmd_type = cmd_ctx->lsm.cmd_type;
168 llm.pid = (uint32_t) cmd_ctx->lsm.domain.attr.pid;
169 llm.cmd_header_size = (uint32_t) cmd_header_len;
170 llm.data_size = (uint32_t) payload_len;
171
172 LTTNG_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<char>(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<char>(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 static int copy_session_consumer(int domain, struct ltt_session *session)
422 {
423 int ret;
424 const char *dir_name;
425 struct consumer_output *consumer;
426
427 LTTNG_ASSERT(session);
428 LTTNG_ASSERT(session->consumer);
429
430 switch (domain) {
431 case LTTNG_DOMAIN_KERNEL:
432 DBG3("Copying tracing session consumer output in kernel session");
433 /*
434 * XXX: We should audit the session creation and what this function
435 * does "extra" in order to avoid a destroy since this function is used
436 * in the domain session creation (kernel and ust) only. Same for UST
437 * domain.
438 */
439 if (session->kernel_session->consumer) {
440 consumer_output_put(session->kernel_session->consumer);
441 }
442 session->kernel_session->consumer =
443 consumer_copy_output(session->consumer);
444 /* Ease our life a bit for the next part */
445 consumer = session->kernel_session->consumer;
446 dir_name = DEFAULT_KERNEL_TRACE_DIR;
447 break;
448 case LTTNG_DOMAIN_JUL:
449 case LTTNG_DOMAIN_LOG4J:
450 case LTTNG_DOMAIN_PYTHON:
451 case LTTNG_DOMAIN_UST:
452 DBG3("Copying tracing session consumer output in UST session");
453 if (session->ust_session->consumer) {
454 consumer_output_put(session->ust_session->consumer);
455 }
456 session->ust_session->consumer =
457 consumer_copy_output(session->consumer);
458 /* Ease our life a bit for the next part */
459 consumer = session->ust_session->consumer;
460 dir_name = DEFAULT_UST_TRACE_DIR;
461 break;
462 default:
463 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
464 goto error;
465 }
466
467 /* Append correct directory to subdir */
468 ret = lttng_strncpy(consumer->domain_subdir, dir_name,
469 sizeof(consumer->domain_subdir));
470 if (ret) {
471 ret = LTTNG_ERR_UNK;
472 goto error;
473 }
474 DBG3("Copy session consumer subdir %s", consumer->domain_subdir);
475 ret = LTTNG_OK;
476
477 error:
478 return ret;
479 }
480
481 /*
482 * Create an UST session and add it to the session ust list.
483 */
484 static int create_ust_session(struct ltt_session *session,
485 const struct lttng_domain *domain)
486 {
487 int ret;
488 struct ltt_ust_session *lus = NULL;
489
490 LTTNG_ASSERT(session);
491 LTTNG_ASSERT(domain);
492 LTTNG_ASSERT(session->consumer);
493
494 switch (domain->type) {
495 case LTTNG_DOMAIN_JUL:
496 case LTTNG_DOMAIN_LOG4J:
497 case LTTNG_DOMAIN_PYTHON:
498 case LTTNG_DOMAIN_UST:
499 break;
500 default:
501 ERR("Unknown UST domain on create session %d", domain->type);
502 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
503 goto error;
504 }
505
506 DBG("Creating UST session");
507
508 lus = trace_ust_create_session(session->id);
509 if (lus == NULL) {
510 ret = LTTNG_ERR_UST_SESS_FAIL;
511 goto error;
512 }
513
514 lus->uid = session->uid;
515 lus->gid = session->gid;
516 lus->output_traces = session->output_traces;
517 lus->snapshot_mode = session->snapshot_mode;
518 lus->live_timer_interval = session->live_timer;
519 session->ust_session = lus;
520 if (session->shm_path[0]) {
521 strncpy(lus->root_shm_path, session->shm_path,
522 sizeof(lus->root_shm_path));
523 lus->root_shm_path[sizeof(lus->root_shm_path) - 1] = '\0';
524 strncpy(lus->shm_path, session->shm_path,
525 sizeof(lus->shm_path));
526 lus->shm_path[sizeof(lus->shm_path) - 1] = '\0';
527 strncat(lus->shm_path, "/ust",
528 sizeof(lus->shm_path) - strlen(lus->shm_path) - 1);
529 }
530 /* Copy session output to the newly created UST session */
531 ret = copy_session_consumer(domain->type, session);
532 if (ret != LTTNG_OK) {
533 goto error;
534 }
535
536 return LTTNG_OK;
537
538 error:
539 free(lus);
540 session->ust_session = NULL;
541 return ret;
542 }
543
544 /*
545 * Create a kernel tracer session then create the default channel.
546 */
547 static int create_kernel_session(struct ltt_session *session)
548 {
549 int ret;
550
551 DBG("Creating kernel session");
552
553 ret = kernel_create_session(session);
554 if (ret < 0) {
555 ret = LTTNG_ERR_KERN_SESS_FAIL;
556 goto error_create;
557 }
558
559 /* Code flow safety */
560 LTTNG_ASSERT(session->kernel_session);
561
562 /* Copy session output to the newly created Kernel session */
563 ret = copy_session_consumer(LTTNG_DOMAIN_KERNEL, session);
564 if (ret != LTTNG_OK) {
565 goto error;
566 }
567
568 session->kernel_session->uid = session->uid;
569 session->kernel_session->gid = session->gid;
570 session->kernel_session->output_traces = session->output_traces;
571 session->kernel_session->snapshot_mode = session->snapshot_mode;
572 session->kernel_session->is_live_session = session->live_timer != 0;
573
574 return LTTNG_OK;
575
576 error:
577 trace_kernel_destroy_session(session->kernel_session);
578 session->kernel_session = NULL;
579 error_create:
580 return ret;
581 }
582
583 /*
584 * Count number of session permitted by uid/gid.
585 */
586 static unsigned int lttng_sessions_count(uid_t uid,
587 gid_t gid __attribute__((unused)))
588 {
589 unsigned int i = 0;
590 struct ltt_session *session;
591 const struct ltt_session_list *session_list = session_get_list();
592
593 DBG("Counting number of available session for UID %d", uid);
594 cds_list_for_each_entry(session, &session_list->head, list) {
595 if (!session_get(session)) {
596 continue;
597 }
598 session_lock(session);
599 /* Only count the sessions the user can control. */
600 if (session_access_ok(session, uid) &&
601 !session->destroyed) {
602 i++;
603 }
604 session_unlock(session);
605 session_put(session);
606 }
607 return i;
608 }
609
610 static enum lttng_error_code receive_lttng_trigger(struct command_ctx *cmd_ctx,
611 int sock,
612 int *sock_error,
613 struct lttng_trigger **_trigger)
614 {
615 int ret;
616 size_t trigger_len;
617 ssize_t sock_recv_len;
618 enum lttng_error_code ret_code;
619 struct lttng_payload trigger_payload;
620 struct lttng_trigger *trigger = NULL;
621
622 lttng_payload_init(&trigger_payload);
623 trigger_len = (size_t) cmd_ctx->lsm.u.trigger.length;
624 ret = lttng_dynamic_buffer_set_size(
625 &trigger_payload.buffer, trigger_len);
626 if (ret) {
627 ret_code = LTTNG_ERR_NOMEM;
628 goto end;
629 }
630
631 sock_recv_len = lttcomm_recv_unix_sock(
632 sock, trigger_payload.buffer.data, trigger_len);
633 if (sock_recv_len < 0 || sock_recv_len != trigger_len) {
634 ERR("Failed to receive trigger in command payload");
635 *sock_error = 1;
636 ret_code = LTTNG_ERR_INVALID_PROTOCOL;
637 goto end;
638 }
639
640 /* Receive fds, if any. */
641 if (cmd_ctx->lsm.fd_count > 0) {
642 sock_recv_len = lttcomm_recv_payload_fds_unix_sock(
643 sock, cmd_ctx->lsm.fd_count, &trigger_payload);
644 if (sock_recv_len > 0 &&
645 sock_recv_len != cmd_ctx->lsm.fd_count * sizeof(int)) {
646 ERR("Failed to receive all file descriptors for trigger in command payload: expected fd count = %u, ret = %d",
647 cmd_ctx->lsm.fd_count, (int) ret);
648 ret_code = LTTNG_ERR_INVALID_PROTOCOL;
649 *sock_error = 1;
650 goto end;
651 } else if (sock_recv_len <= 0) {
652 ERR("Failed to receive file descriptors for trigger in command payload: expected fd count = %u, ret = %d",
653 cmd_ctx->lsm.fd_count, (int) ret);
654 ret_code = LTTNG_ERR_FATAL;
655 *sock_error = 1;
656 goto end;
657 }
658 }
659
660 /* Deserialize trigger. */
661 {
662 struct lttng_payload_view view =
663 lttng_payload_view_from_payload(
664 &trigger_payload, 0, -1);
665
666 if (lttng_trigger_create_from_payload(&view, &trigger) !=
667 trigger_len) {
668 ERR("Invalid trigger received as part of command payload");
669 ret_code = LTTNG_ERR_INVALID_TRIGGER;
670 lttng_trigger_put(trigger);
671 goto end;
672 }
673 }
674
675 *_trigger = trigger;
676 ret_code = LTTNG_OK;
677
678 end:
679 lttng_payload_reset(&trigger_payload);
680 return ret_code;
681 }
682
683 static enum lttng_error_code receive_lttng_error_query(struct command_ctx *cmd_ctx,
684 int sock,
685 int *sock_error,
686 struct lttng_error_query **_query)
687 {
688 int ret;
689 size_t query_len;
690 ssize_t sock_recv_len;
691 enum lttng_error_code ret_code;
692 struct lttng_payload query_payload;
693 struct lttng_error_query *query = NULL;
694
695 lttng_payload_init(&query_payload);
696 query_len = (size_t) cmd_ctx->lsm.u.error_query.length;
697 ret = lttng_dynamic_buffer_set_size(&query_payload.buffer, query_len);
698 if (ret) {
699 ret_code = LTTNG_ERR_NOMEM;
700 goto end;
701 }
702
703 sock_recv_len = lttcomm_recv_unix_sock(
704 sock, query_payload.buffer.data, query_len);
705 if (sock_recv_len < 0 || sock_recv_len != query_len) {
706 ERR("Failed to receive error query in command payload");
707 *sock_error = 1;
708 ret_code = LTTNG_ERR_INVALID_PROTOCOL;
709 goto end;
710 }
711
712 /* Receive fds, if any. */
713 if (cmd_ctx->lsm.fd_count > 0) {
714 sock_recv_len = lttcomm_recv_payload_fds_unix_sock(
715 sock, cmd_ctx->lsm.fd_count, &query_payload);
716 if (sock_recv_len > 0 &&
717 sock_recv_len != cmd_ctx->lsm.fd_count * sizeof(int)) {
718 ERR("Failed to receive all file descriptors for error query in command payload: expected fd count = %u, ret = %d",
719 cmd_ctx->lsm.fd_count, (int) ret);
720 ret_code = LTTNG_ERR_INVALID_PROTOCOL;
721 *sock_error = 1;
722 goto end;
723 } else if (sock_recv_len <= 0) {
724 ERR("Failed to receive file descriptors for error query in command payload: expected fd count = %u, ret = %d",
725 cmd_ctx->lsm.fd_count, (int) ret);
726 ret_code = LTTNG_ERR_FATAL;
727 *sock_error = 1;
728 goto end;
729 }
730 }
731
732 /* Deserialize error query. */
733 {
734 struct lttng_payload_view view =
735 lttng_payload_view_from_payload(
736 &query_payload, 0, -1);
737
738 if (lttng_error_query_create_from_payload(&view, &query) !=
739 query_len) {
740 ERR("Invalid error query received as part of command payload");
741 ret_code = LTTNG_ERR_INVALID_PROTOCOL;
742 goto end;
743 }
744 }
745
746 *_query = query;
747 ret_code = LTTNG_OK;
748
749 end:
750 lttng_payload_reset(&query_payload);
751 return ret_code;
752 }
753
754 static enum lttng_error_code receive_lttng_event(struct command_ctx *cmd_ctx,
755 int sock,
756 int *sock_error,
757 struct lttng_event **out_event,
758 char **out_filter_expression,
759 struct lttng_bytecode **out_bytecode,
760 struct lttng_event_exclusion **out_exclusion)
761 {
762 int ret;
763 size_t event_len;
764 ssize_t sock_recv_len;
765 enum lttng_error_code ret_code;
766 struct lttng_payload event_payload;
767 struct lttng_event *local_event = NULL;
768 char *local_filter_expression = NULL;
769 struct lttng_bytecode *local_bytecode = NULL;
770 struct lttng_event_exclusion *local_exclusion = NULL;
771
772 lttng_payload_init(&event_payload);
773 if (cmd_ctx->lsm.cmd_type == LTTNG_ENABLE_EVENT) {
774 event_len = (size_t) cmd_ctx->lsm.u.enable.length;
775 } else if (cmd_ctx->lsm.cmd_type == LTTNG_DISABLE_EVENT) {
776 event_len = (size_t) cmd_ctx->lsm.u.disable.length;
777 } else {
778 abort();
779 }
780
781 ret = lttng_dynamic_buffer_set_size(&event_payload.buffer, event_len);
782 if (ret) {
783 ret_code = LTTNG_ERR_NOMEM;
784 goto end;
785 }
786
787 sock_recv_len = lttcomm_recv_unix_sock(
788 sock, event_payload.buffer.data, event_len);
789 if (sock_recv_len < 0 || sock_recv_len != event_len) {
790 ERR("Failed to receive event in command payload");
791 *sock_error = 1;
792 ret_code = LTTNG_ERR_INVALID_PROTOCOL;
793 goto end;
794 }
795
796 /* Receive fds, if any. */
797 if (cmd_ctx->lsm.fd_count > 0) {
798 sock_recv_len = lttcomm_recv_payload_fds_unix_sock(
799 sock, cmd_ctx->lsm.fd_count, &event_payload);
800 if (sock_recv_len > 0 &&
801 sock_recv_len != cmd_ctx->lsm.fd_count * sizeof(int)) {
802 ERR("Failed to receive all file descriptors for event in command payload: expected fd count = %u, ret = %d",
803 cmd_ctx->lsm.fd_count, (int) ret);
804 ret_code = LTTNG_ERR_INVALID_PROTOCOL;
805 *sock_error = 1;
806 goto end;
807 } else if (sock_recv_len <= 0) {
808 ERR("Failed to receive file descriptors for event in command payload: expected fd count = %u, ret = %d",
809 cmd_ctx->lsm.fd_count, (int) ret);
810 ret_code = LTTNG_ERR_FATAL;
811 *sock_error = 1;
812 goto end;
813 }
814 }
815
816 /* Deserialize event. */
817 {
818 ssize_t len;
819 struct lttng_payload_view event_view =
820 lttng_payload_view_from_payload(
821 &event_payload, 0, -1);
822
823 len = lttng_event_create_from_payload(&event_view, &local_event,
824 &local_exclusion, &local_filter_expression,
825 &local_bytecode);
826
827 if (len < 0) {
828 ERR("Failed to create an event from the received buffer");
829 ret_code = LTTNG_ERR_INVALID_PROTOCOL;
830 goto end;
831 }
832
833 if (len != event_len) {
834 ERR("Userspace probe location from the received buffer is not the advertised length: header length = %zu" PRIu32 ", payload length = %zd", event_len, len);
835 ret_code = LTTNG_ERR_INVALID_PROTOCOL;
836 goto end;
837 }
838 }
839
840 *out_event = local_event;
841 *out_exclusion = local_exclusion;
842 *out_filter_expression = local_filter_expression;
843 *out_bytecode = local_bytecode;
844 local_event = NULL;
845 local_exclusion = NULL;
846 local_filter_expression = NULL;
847 local_bytecode = NULL;
848
849 ret_code = LTTNG_OK;
850
851 end:
852 lttng_payload_reset(&event_payload);
853 lttng_event_destroy(local_event);
854 free(local_filter_expression);
855 free(local_bytecode);
856 free(local_exclusion);
857 return ret_code;
858 }
859
860 static enum lttng_error_code receive_lttng_event_context(
861 const struct command_ctx *cmd_ctx,
862 int sock,
863 int *sock_error,
864 struct lttng_event_context **out_event_context)
865 {
866 int ret;
867 const size_t event_context_len =
868 (size_t) cmd_ctx->lsm.u.context.length;
869 ssize_t sock_recv_len;
870 enum lttng_error_code ret_code;
871 struct lttng_payload event_context_payload;
872 struct lttng_event_context *context = NULL;
873
874 lttng_payload_init(&event_context_payload);
875
876 ret = lttng_dynamic_buffer_set_size(&event_context_payload.buffer,
877 event_context_len);
878 if (ret) {
879 ret_code = LTTNG_ERR_NOMEM;
880 goto end;
881 }
882
883 sock_recv_len = lttcomm_recv_unix_sock(
884 sock, event_context_payload.buffer.data,
885 event_context_len);
886 if (sock_recv_len < 0 || sock_recv_len != event_context_len) {
887 ERR("Failed to receive event context in command payload");
888 *sock_error = 1;
889 ret_code = LTTNG_ERR_INVALID_PROTOCOL;
890 goto end;
891 }
892
893 /* Deserialize event. */
894 {
895 ssize_t len;
896 struct lttng_payload_view event_context_view =
897 lttng_payload_view_from_payload(
898 &event_context_payload, 0, -1);
899
900 len = lttng_event_context_create_from_payload(
901 &event_context_view, &context);
902
903 if (len < 0) {
904 ERR("Failed to create a event context from the received buffer");
905 ret_code = LTTNG_ERR_INVALID_PROTOCOL;
906 goto end;
907 }
908
909 if (len != event_context_len) {
910 ERR("Event context from the received buffer is not the advertised length: expected length = %zu, payload length = %zd", event_context_len, len);
911 ret_code = LTTNG_ERR_INVALID_PROTOCOL;
912 goto end;
913 }
914 }
915
916 *out_event_context = context;
917 context = NULL;
918 ret_code = LTTNG_OK;
919
920 end:
921 lttng_event_context_destroy(context);
922 lttng_payload_reset(&event_context_payload);
923 return ret_code;
924 }
925
926 /*
927 * Version of setup_lttng_msg() without command header.
928 */
929 static int setup_lttng_msg_no_cmd_header(struct command_ctx *cmd_ctx,
930 void *payload_buf, size_t payload_len)
931 {
932 return setup_lttng_msg(cmd_ctx, payload_buf, payload_len, NULL, 0);
933 }
934
935 /*
936 * Check if the current kernel tracer supports the session rotation feature.
937 * Return 1 if it does, 0 otherwise.
938 */
939 static int check_rotate_compatible(void)
940 {
941 int ret = 1;
942
943 if (the_kernel_tracer_version.major != 2 ||
944 the_kernel_tracer_version.minor < 11) {
945 DBG("Kernel tracer version is not compatible with the rotation feature");
946 ret = 0;
947 }
948
949 return ret;
950 }
951
952 /*
953 * Send data on a unix socket using the liblttsessiondcomm API.
954 *
955 * Return lttcomm error code.
956 */
957 static int send_unix_sock(int sock, struct lttng_payload_view *view)
958 {
959 int ret;
960 const int fd_count = lttng_payload_view_get_fd_handle_count(view);
961
962 /* Check valid length */
963 if (view->buffer.size == 0) {
964 ret = -1;
965 goto end;
966 }
967
968 ret = lttcomm_send_unix_sock(
969 sock, view->buffer.data, view->buffer.size);
970 if (ret < 0) {
971 goto end;
972 }
973
974 if (fd_count > 0) {
975 ret = lttcomm_send_payload_view_fds_unix_sock(sock, view);
976 if (ret < 0) {
977 goto end;
978 }
979 }
980
981 end:
982 return ret;
983 }
984
985 /*
986 * Process the command requested by the lttng client within the command
987 * context structure. This function make sure that the return structure (llm)
988 * is set and ready for transmission before returning.
989 *
990 * Return any error encountered or 0 for success.
991 *
992 * "sock" is only used for special-case var. len data.
993 * A command may assume the ownership of the socket, in which case its value
994 * should be set to -1.
995 */
996 static int process_client_msg(struct command_ctx *cmd_ctx, int *sock,
997 int *sock_error)
998 {
999 int ret = LTTNG_OK;
1000 bool need_tracing_session = true;
1001 bool need_domain;
1002 bool need_consumerd;
1003
1004 DBG("Processing client command '%s\' (%d)",
1005 lttcomm_sessiond_command_str((lttcomm_sessiond_command) cmd_ctx->lsm.cmd_type),
1006 cmd_ctx->lsm.cmd_type);
1007
1008 *sock_error = 0;
1009
1010 switch (cmd_ctx->lsm.cmd_type) {
1011 case LTTNG_CREATE_SESSION_EXT:
1012 case LTTNG_DESTROY_SESSION:
1013 case LTTNG_LIST_SESSIONS:
1014 case LTTNG_LIST_DOMAINS:
1015 case LTTNG_START_TRACE:
1016 case LTTNG_STOP_TRACE:
1017 case LTTNG_DATA_PENDING:
1018 case LTTNG_SNAPSHOT_ADD_OUTPUT:
1019 case LTTNG_SNAPSHOT_DEL_OUTPUT:
1020 case LTTNG_SNAPSHOT_LIST_OUTPUT:
1021 case LTTNG_SNAPSHOT_RECORD:
1022 case LTTNG_SAVE_SESSION:
1023 case LTTNG_SET_SESSION_SHM_PATH:
1024 case LTTNG_REGENERATE_METADATA:
1025 case LTTNG_REGENERATE_STATEDUMP:
1026 case LTTNG_ROTATE_SESSION:
1027 case LTTNG_ROTATION_GET_INFO:
1028 case LTTNG_ROTATION_SET_SCHEDULE:
1029 case LTTNG_SESSION_LIST_ROTATION_SCHEDULES:
1030 case LTTNG_CLEAR_SESSION:
1031 case LTTNG_LIST_TRIGGERS:
1032 case LTTNG_EXECUTE_ERROR_QUERY:
1033 need_domain = false;
1034 break;
1035 default:
1036 need_domain = true;
1037 }
1038
1039 /* Needs a functioning consumerd? */
1040 switch (cmd_ctx->lsm.cmd_type) {
1041 case LTTNG_REGISTER_TRIGGER:
1042 case LTTNG_UNREGISTER_TRIGGER:
1043 case LTTNG_EXECUTE_ERROR_QUERY:
1044 need_consumerd = false;
1045 break;
1046 default:
1047 need_consumerd = true;
1048 break;
1049 }
1050
1051 if (the_config.no_kernel && need_domain &&
1052 cmd_ctx->lsm.domain.type == LTTNG_DOMAIN_KERNEL) {
1053 if (!is_root) {
1054 ret = LTTNG_ERR_NEED_ROOT_SESSIOND;
1055 } else {
1056 ret = LTTNG_ERR_KERN_NA;
1057 }
1058 goto error;
1059 }
1060
1061 /* Deny register consumer if we already have a spawned consumer. */
1062 if (cmd_ctx->lsm.cmd_type == LTTNG_REGISTER_CONSUMER) {
1063 pthread_mutex_lock(&the_kconsumer_data.pid_mutex);
1064 if (the_kconsumer_data.pid > 0) {
1065 ret = LTTNG_ERR_KERN_CONSUMER_FAIL;
1066 pthread_mutex_unlock(&the_kconsumer_data.pid_mutex);
1067 goto error;
1068 }
1069 pthread_mutex_unlock(&the_kconsumer_data.pid_mutex);
1070 }
1071
1072 /*
1073 * Check for command that don't needs to allocate a returned payload. We do
1074 * this here so we don't have to make the call for no payload at each
1075 * command.
1076 */
1077 switch(cmd_ctx->lsm.cmd_type) {
1078 case LTTNG_LIST_SESSIONS:
1079 case LTTNG_LIST_TRACEPOINTS:
1080 case LTTNG_LIST_TRACEPOINT_FIELDS:
1081 case LTTNG_LIST_DOMAINS:
1082 case LTTNG_LIST_CHANNELS:
1083 case LTTNG_LIST_EVENTS:
1084 case LTTNG_LIST_SYSCALLS:
1085 case LTTNG_SESSION_LIST_ROTATION_SCHEDULES:
1086 case LTTNG_PROCESS_ATTR_TRACKER_GET_POLICY:
1087 case LTTNG_PROCESS_ATTR_TRACKER_GET_INCLUSION_SET:
1088 case LTTNG_DATA_PENDING:
1089 case LTTNG_ROTATE_SESSION:
1090 case LTTNG_ROTATION_GET_INFO:
1091 case LTTNG_REGISTER_TRIGGER:
1092 case LTTNG_LIST_TRIGGERS:
1093 case LTTNG_EXECUTE_ERROR_QUERY:
1094 break;
1095 default:
1096 /* Setup lttng message with no payload */
1097 ret = setup_lttng_msg_no_cmd_header(cmd_ctx, NULL, 0);
1098 if (ret < 0) {
1099 /* This label does not try to unlock the session */
1100 goto init_setup_error;
1101 }
1102 }
1103
1104 /* Commands that DO NOT need a session. */
1105 switch (cmd_ctx->lsm.cmd_type) {
1106 case LTTNG_CREATE_SESSION_EXT:
1107 case LTTNG_LIST_SESSIONS:
1108 case LTTNG_LIST_TRACEPOINTS:
1109 case LTTNG_LIST_SYSCALLS:
1110 case LTTNG_LIST_TRACEPOINT_FIELDS:
1111 case LTTNG_SAVE_SESSION:
1112 case LTTNG_REGISTER_TRIGGER:
1113 case LTTNG_UNREGISTER_TRIGGER:
1114 case LTTNG_LIST_TRIGGERS:
1115 case LTTNG_EXECUTE_ERROR_QUERY:
1116 need_tracing_session = false;
1117 break;
1118 default:
1119 DBG("Getting session %s by name", cmd_ctx->lsm.session.name);
1120 /*
1121 * We keep the session list lock across _all_ commands
1122 * for now, because the per-session lock does not
1123 * handle teardown properly.
1124 */
1125 session_lock_list();
1126 cmd_ctx->session = session_find_by_name(cmd_ctx->lsm.session.name);
1127 if (cmd_ctx->session == NULL) {
1128 ret = LTTNG_ERR_SESS_NOT_FOUND;
1129 goto error;
1130 } else {
1131 /* Acquire lock for the session */
1132 session_lock(cmd_ctx->session);
1133 }
1134 break;
1135 }
1136
1137 /*
1138 * Commands that need a valid session but should NOT create one if none
1139 * exists. Instead of creating one and destroying it when the command is
1140 * handled, process that right before so we save some round trip in useless
1141 * code path.
1142 */
1143 switch (cmd_ctx->lsm.cmd_type) {
1144 case LTTNG_DISABLE_CHANNEL:
1145 case LTTNG_DISABLE_EVENT:
1146 switch (cmd_ctx->lsm.domain.type) {
1147 case LTTNG_DOMAIN_KERNEL:
1148 if (!cmd_ctx->session->kernel_session) {
1149 ret = LTTNG_ERR_NO_CHANNEL;
1150 goto error;
1151 }
1152 break;
1153 case LTTNG_DOMAIN_JUL:
1154 case LTTNG_DOMAIN_LOG4J:
1155 case LTTNG_DOMAIN_PYTHON:
1156 case LTTNG_DOMAIN_UST:
1157 if (!cmd_ctx->session->ust_session) {
1158 ret = LTTNG_ERR_NO_CHANNEL;
1159 goto error;
1160 }
1161 break;
1162 default:
1163 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
1164 goto error;
1165 }
1166 default:
1167 break;
1168 }
1169
1170 if (!need_domain) {
1171 goto skip_domain;
1172 }
1173
1174 /*
1175 * Check domain type for specific "pre-action".
1176 */
1177 switch (cmd_ctx->lsm.domain.type) {
1178 case LTTNG_DOMAIN_KERNEL:
1179 if (!is_root) {
1180 ret = LTTNG_ERR_NEED_ROOT_SESSIOND;
1181 goto error;
1182 }
1183
1184 /* Kernel tracer check */
1185 if (!kernel_tracer_is_initialized()) {
1186 /* Basically, load kernel tracer modules */
1187 ret = init_kernel_tracer();
1188 if (ret != 0) {
1189 goto error;
1190 }
1191 }
1192
1193 /* Consumer is in an ERROR state. Report back to client */
1194 if (need_consumerd && uatomic_read(&the_kernel_consumerd_state) ==
1195 CONSUMER_ERROR) {
1196 ret = LTTNG_ERR_NO_KERNCONSUMERD;
1197 goto error;
1198 }
1199
1200 /* Need a session for kernel command */
1201 if (need_tracing_session) {
1202 if (cmd_ctx->session->kernel_session == NULL) {
1203 ret = create_kernel_session(cmd_ctx->session);
1204 if (ret != LTTNG_OK) {
1205 ret = LTTNG_ERR_KERN_SESS_FAIL;
1206 goto error;
1207 }
1208 }
1209
1210 /* Start the kernel consumer daemon */
1211 pthread_mutex_lock(&the_kconsumer_data.pid_mutex);
1212 if (the_kconsumer_data.pid == 0 &&
1213 cmd_ctx->lsm.cmd_type != LTTNG_REGISTER_CONSUMER) {
1214 pthread_mutex_unlock(&the_kconsumer_data.pid_mutex);
1215 ret = start_consumerd(&the_kconsumer_data);
1216 if (ret < 0) {
1217 ret = LTTNG_ERR_KERN_CONSUMER_FAIL;
1218 goto error;
1219 }
1220 uatomic_set(&the_kernel_consumerd_state, CONSUMER_STARTED);
1221 } else {
1222 pthread_mutex_unlock(&the_kconsumer_data.pid_mutex);
1223 }
1224
1225 /*
1226 * The consumer was just spawned so we need to add the socket to
1227 * the consumer output of the session if exist.
1228 */
1229 ret = consumer_create_socket(&the_kconsumer_data,
1230 cmd_ctx->session->kernel_session->consumer);
1231 if (ret < 0) {
1232 goto error;
1233 }
1234 }
1235
1236 break;
1237 case LTTNG_DOMAIN_JUL:
1238 case LTTNG_DOMAIN_LOG4J:
1239 case LTTNG_DOMAIN_PYTHON:
1240 if (!agent_tracing_is_enabled()) {
1241 ret = LTTNG_ERR_AGENT_TRACING_DISABLED;
1242 goto error;
1243 }
1244 /* Fallthrough */
1245 case LTTNG_DOMAIN_UST:
1246 {
1247 if (!ust_app_supported()) {
1248 ret = LTTNG_ERR_NO_UST;
1249 goto error;
1250 }
1251
1252 /* Consumer is in an ERROR state. Report back to client */
1253 if (need_consumerd &&
1254 uatomic_read(&the_ust_consumerd_state) ==
1255 CONSUMER_ERROR) {
1256 ret = LTTNG_ERR_NO_USTCONSUMERD;
1257 goto error;
1258 }
1259
1260 if (need_tracing_session) {
1261 /* Create UST session if none exist. */
1262 if (cmd_ctx->session->ust_session == NULL) {
1263 lttng_domain domain = cmd_ctx->lsm.domain;
1264 ret = create_ust_session(cmd_ctx->session, &domain);
1265 if (ret != LTTNG_OK) {
1266 goto error;
1267 }
1268 }
1269
1270 /* Start the UST consumer daemons */
1271 /* 64-bit */
1272 pthread_mutex_lock(&the_ustconsumer64_data.pid_mutex);
1273 if (the_config.consumerd64_bin_path.value &&
1274 the_ustconsumer64_data.pid == 0 &&
1275 cmd_ctx->lsm.cmd_type != LTTNG_REGISTER_CONSUMER) {
1276 pthread_mutex_unlock(&the_ustconsumer64_data.pid_mutex);
1277 ret = start_consumerd(&the_ustconsumer64_data);
1278 if (ret < 0) {
1279 ret = LTTNG_ERR_UST_CONSUMER64_FAIL;
1280 uatomic_set(&the_ust_consumerd64_fd, -EINVAL);
1281 goto error;
1282 }
1283
1284 uatomic_set(&the_ust_consumerd64_fd, the_ustconsumer64_data.cmd_sock);
1285 uatomic_set(&the_ust_consumerd_state, CONSUMER_STARTED);
1286 } else {
1287 pthread_mutex_unlock(&the_ustconsumer64_data.pid_mutex);
1288 }
1289
1290 /*
1291 * Setup socket for consumer 64 bit. No need for atomic access
1292 * since it was set above and can ONLY be set in this thread.
1293 */
1294 ret = consumer_create_socket(&the_ustconsumer64_data,
1295 cmd_ctx->session->ust_session->consumer);
1296 if (ret < 0) {
1297 goto error;
1298 }
1299
1300 /* 32-bit */
1301 pthread_mutex_lock(&the_ustconsumer32_data.pid_mutex);
1302 if (the_config.consumerd32_bin_path.value &&
1303 the_ustconsumer32_data.pid == 0 &&
1304 cmd_ctx->lsm.cmd_type != LTTNG_REGISTER_CONSUMER) {
1305 pthread_mutex_unlock(&the_ustconsumer32_data.pid_mutex);
1306 ret = start_consumerd(&the_ustconsumer32_data);
1307 if (ret < 0) {
1308 ret = LTTNG_ERR_UST_CONSUMER32_FAIL;
1309 uatomic_set(&the_ust_consumerd32_fd, -EINVAL);
1310 goto error;
1311 }
1312
1313 uatomic_set(&the_ust_consumerd32_fd, the_ustconsumer32_data.cmd_sock);
1314 uatomic_set(&the_ust_consumerd_state, CONSUMER_STARTED);
1315 } else {
1316 pthread_mutex_unlock(&the_ustconsumer32_data.pid_mutex);
1317 }
1318
1319 /*
1320 * Setup socket for consumer 32 bit. No need for atomic access
1321 * since it was set above and can ONLY be set in this thread.
1322 */
1323 ret = consumer_create_socket(&the_ustconsumer32_data,
1324 cmd_ctx->session->ust_session->consumer);
1325 if (ret < 0) {
1326 goto error;
1327 }
1328 }
1329 break;
1330 }
1331 default:
1332 break;
1333 }
1334 skip_domain:
1335
1336 /* Validate consumer daemon state when start/stop trace command */
1337 if (cmd_ctx->lsm.cmd_type == LTTNG_START_TRACE ||
1338 cmd_ctx->lsm.cmd_type == LTTNG_STOP_TRACE) {
1339 switch (cmd_ctx->lsm.domain.type) {
1340 case LTTNG_DOMAIN_NONE:
1341 break;
1342 case LTTNG_DOMAIN_JUL:
1343 case LTTNG_DOMAIN_LOG4J:
1344 case LTTNG_DOMAIN_PYTHON:
1345 case LTTNG_DOMAIN_UST:
1346 if (uatomic_read(&the_ust_consumerd_state) != CONSUMER_STARTED) {
1347 ret = LTTNG_ERR_NO_USTCONSUMERD;
1348 goto error;
1349 }
1350 break;
1351 case LTTNG_DOMAIN_KERNEL:
1352 if (uatomic_read(&the_kernel_consumerd_state) != CONSUMER_STARTED) {
1353 ret = LTTNG_ERR_NO_KERNCONSUMERD;
1354 goto error;
1355 }
1356 break;
1357 default:
1358 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
1359 goto error;
1360 }
1361 }
1362
1363 /*
1364 * Check that the UID matches that of the tracing session.
1365 * The root user can interact with all sessions.
1366 */
1367 if (need_tracing_session) {
1368 if (!session_access_ok(cmd_ctx->session,
1369 LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds)) ||
1370 cmd_ctx->session->destroyed) {
1371 ret = LTTNG_ERR_EPERM;
1372 goto error;
1373 }
1374 }
1375
1376 /*
1377 * Send relayd information to consumer as soon as we have a domain and a
1378 * session defined.
1379 */
1380 if (cmd_ctx->session && need_domain) {
1381 /*
1382 * Setup relayd if not done yet. If the relayd information was already
1383 * sent to the consumer, this call will gracefully return.
1384 */
1385 ret = cmd_setup_relayd(cmd_ctx->session);
1386 if (ret != LTTNG_OK) {
1387 goto error;
1388 }
1389 }
1390
1391 /* Process by command type */
1392 switch (cmd_ctx->lsm.cmd_type) {
1393 case LTTNG_ADD_CONTEXT:
1394 {
1395 struct lttng_event_context *event_context = NULL;
1396 const enum lttng_error_code ret_code =
1397 receive_lttng_event_context(
1398 cmd_ctx, *sock, sock_error, &event_context);
1399
1400 if (ret_code != LTTNG_OK) {
1401 ret = (int) ret_code;
1402 goto error;
1403 }
1404
1405 ret = cmd_add_context(cmd_ctx, event_context, the_kernel_poll_pipe[1]);
1406 lttng_event_context_destroy(event_context);
1407 break;
1408 }
1409 case LTTNG_DISABLE_CHANNEL:
1410 {
1411 ret = cmd_disable_channel(cmd_ctx->session, cmd_ctx->lsm.domain.type,
1412 cmd_ctx->lsm.u.disable.channel_name);
1413 break;
1414 }
1415 case LTTNG_ENABLE_CHANNEL:
1416 {
1417 ret = cmd_enable_channel(
1418 cmd_ctx, *sock, the_kernel_poll_pipe[1]);
1419 break;
1420 }
1421 case LTTNG_PROCESS_ATTR_TRACKER_ADD_INCLUDE_VALUE:
1422 case LTTNG_PROCESS_ATTR_TRACKER_REMOVE_INCLUDE_VALUE:
1423 {
1424 struct lttng_dynamic_buffer payload;
1425 struct lttng_buffer_view payload_view;
1426 const bool add_value =
1427 cmd_ctx->lsm.cmd_type ==
1428 LTTNG_PROCESS_ATTR_TRACKER_ADD_INCLUDE_VALUE;
1429 const size_t name_len =
1430 cmd_ctx->lsm.u.process_attr_tracker_add_remove_include_value
1431 .name_len;
1432 const enum lttng_domain_type domain_type =
1433 (enum lttng_domain_type)
1434 cmd_ctx->lsm.domain.type;
1435 const enum lttng_process_attr process_attr =
1436 (enum lttng_process_attr) cmd_ctx->lsm.u
1437 .process_attr_tracker_add_remove_include_value
1438 .process_attr;
1439 const enum lttng_process_attr_value_type value_type =
1440 (enum lttng_process_attr_value_type) cmd_ctx
1441 ->lsm.u
1442 .process_attr_tracker_add_remove_include_value
1443 .value_type;
1444 struct process_attr_value *value;
1445 enum lttng_error_code ret_code;
1446 long login_name_max;
1447
1448 login_name_max = sysconf(_SC_LOGIN_NAME_MAX);
1449 if (login_name_max < 0) {
1450 PERROR("Failed to get _SC_LOGIN_NAME_MAX system configuration");
1451 ret = LTTNG_ERR_INVALID;
1452 goto error;
1453 }
1454
1455 /* Receive remaining variable length payload if applicable. */
1456 if (name_len > login_name_max) {
1457 /*
1458 * POSIX mandates user and group names that are at least
1459 * 8 characters long. Note that although shadow-utils
1460 * (useradd, groupaadd, etc.) use 32 chars as their
1461 * limit (from bits/utmp.h, UT_NAMESIZE),
1462 * LOGIN_NAME_MAX is defined to 256.
1463 */
1464 ERR("Rejecting process attribute tracker value %s as the provided exceeds the maximal allowed length: argument length = %zu, maximal length = %ld",
1465 add_value ? "addition" : "removal",
1466 name_len, login_name_max);
1467 ret = LTTNG_ERR_INVALID;
1468 goto error;
1469 }
1470
1471 lttng_dynamic_buffer_init(&payload);
1472 if (name_len != 0) {
1473 /*
1474 * Receive variable payload for user/group name
1475 * arguments.
1476 */
1477 ret = lttng_dynamic_buffer_set_size(&payload, name_len);
1478 if (ret) {
1479 ERR("Failed to allocate buffer to receive payload of %s process attribute tracker value argument",
1480 add_value ? "add" : "remove");
1481 ret = LTTNG_ERR_NOMEM;
1482 goto error_add_remove_tracker_value;
1483 }
1484
1485 ret = lttcomm_recv_unix_sock(
1486 *sock, payload.data, name_len);
1487 if (ret <= 0) {
1488 ERR("Failed to receive payload of %s process attribute tracker value argument",
1489 add_value ? "add" : "remove");
1490 *sock_error = 1;
1491 ret = LTTNG_ERR_INVALID_PROTOCOL;
1492 goto error_add_remove_tracker_value;
1493 }
1494 }
1495
1496 payload_view = lttng_buffer_view_from_dynamic_buffer(
1497 &payload, 0, name_len);
1498 if (name_len > 0 && !lttng_buffer_view_is_valid(&payload_view)) {
1499 ret = LTTNG_ERR_INVALID_PROTOCOL;
1500 goto error_add_remove_tracker_value;
1501 }
1502
1503 /*
1504 * Validate the value type and domains are legal for the process
1505 * attribute tracker that is specified and convert the value to
1506 * add/remove to the internal sessiond representation.
1507 */
1508 ret_code = process_attr_value_from_comm(domain_type,
1509 process_attr, value_type,
1510 &cmd_ctx->lsm.u.process_attr_tracker_add_remove_include_value
1511 .integral_value,
1512 &payload_view, &value);
1513 if (ret_code != LTTNG_OK) {
1514 ret = ret_code;
1515 goto error_add_remove_tracker_value;
1516 }
1517
1518 if (add_value) {
1519 ret = cmd_process_attr_tracker_inclusion_set_add_value(
1520 cmd_ctx->session, domain_type,
1521 process_attr, value);
1522 } else {
1523 ret = cmd_process_attr_tracker_inclusion_set_remove_value(
1524 cmd_ctx->session, domain_type,
1525 process_attr, value);
1526 }
1527 process_attr_value_destroy(value);
1528 error_add_remove_tracker_value:
1529 lttng_dynamic_buffer_reset(&payload);
1530 break;
1531 }
1532 case LTTNG_PROCESS_ATTR_TRACKER_GET_POLICY:
1533 {
1534 enum lttng_tracking_policy tracking_policy;
1535 const enum lttng_domain_type domain_type =
1536 (enum lttng_domain_type)
1537 cmd_ctx->lsm.domain.type;
1538 const enum lttng_process_attr process_attr =
1539 (enum lttng_process_attr) cmd_ctx->lsm.u
1540 .process_attr_tracker_get_tracking_policy
1541 .process_attr;
1542
1543 ret = cmd_process_attr_tracker_get_tracking_policy(
1544 cmd_ctx->session, domain_type, process_attr,
1545 &tracking_policy);
1546 if (ret != LTTNG_OK) {
1547 goto error;
1548 }
1549
1550 uint32_t tracking_policy_u32 = tracking_policy;
1551 ret = setup_lttng_msg_no_cmd_header(cmd_ctx,
1552 &tracking_policy_u32, sizeof(uint32_t));
1553 if (ret < 0) {
1554 ret = LTTNG_ERR_NOMEM;
1555 goto error;
1556 }
1557 ret = LTTNG_OK;
1558 break;
1559 }
1560 case LTTNG_PROCESS_ATTR_TRACKER_SET_POLICY:
1561 {
1562 const enum lttng_tracking_policy tracking_policy =
1563 (enum lttng_tracking_policy) cmd_ctx->lsm.u
1564 .process_attr_tracker_set_tracking_policy
1565 .tracking_policy;
1566 const enum lttng_domain_type domain_type =
1567 (enum lttng_domain_type)
1568 cmd_ctx->lsm.domain.type;
1569 const enum lttng_process_attr process_attr =
1570 (enum lttng_process_attr) cmd_ctx->lsm.u
1571 .process_attr_tracker_set_tracking_policy
1572 .process_attr;
1573
1574 ret = cmd_process_attr_tracker_set_tracking_policy(
1575 cmd_ctx->session, domain_type, process_attr,
1576 tracking_policy);
1577 if (ret != LTTNG_OK) {
1578 goto error;
1579 }
1580 break;
1581 }
1582 case LTTNG_PROCESS_ATTR_TRACKER_GET_INCLUSION_SET:
1583 {
1584 struct lttng_process_attr_values *values;
1585 struct lttng_dynamic_buffer reply;
1586 const enum lttng_domain_type domain_type =
1587 (enum lttng_domain_type)
1588 cmd_ctx->lsm.domain.type;
1589 const enum lttng_process_attr process_attr =
1590 (enum lttng_process_attr) cmd_ctx->lsm.u
1591 .process_attr_tracker_get_inclusion_set
1592 .process_attr;
1593
1594 ret = cmd_process_attr_tracker_get_inclusion_set(
1595 cmd_ctx->session, domain_type, process_attr,
1596 &values);
1597 if (ret != LTTNG_OK) {
1598 goto error;
1599 }
1600
1601 lttng_dynamic_buffer_init(&reply);
1602 ret = lttng_process_attr_values_serialize(values, &reply);
1603 if (ret < 0) {
1604 goto error_tracker_get_inclusion_set;
1605 }
1606
1607 ret = setup_lttng_msg_no_cmd_header(
1608 cmd_ctx, reply.data, reply.size);
1609 if (ret < 0) {
1610 ret = LTTNG_ERR_NOMEM;
1611 goto error_tracker_get_inclusion_set;
1612 }
1613 ret = LTTNG_OK;
1614
1615 error_tracker_get_inclusion_set:
1616 lttng_process_attr_values_destroy(values);
1617 lttng_dynamic_buffer_reset(&reply);
1618 break;
1619 }
1620 case LTTNG_ENABLE_EVENT:
1621 case LTTNG_DISABLE_EVENT:
1622 {
1623 struct lttng_event *event;
1624 char *filter_expression;
1625 struct lttng_event_exclusion *exclusions;
1626 struct lttng_bytecode *bytecode;
1627 const enum lttng_error_code ret_code = receive_lttng_event(
1628 cmd_ctx, *sock, sock_error, &event,
1629 &filter_expression, &bytecode, &exclusions);
1630
1631 if (ret_code != LTTNG_OK) {
1632 ret = (int) ret_code;
1633 goto error;
1634 }
1635
1636 /*
1637 * Ownership of filter_expression, exclusions, and bytecode is
1638 * always transferred.
1639 */
1640 ret = cmd_ctx->lsm.cmd_type == LTTNG_ENABLE_EVENT ?
1641 cmd_enable_event(cmd_ctx, event,
1642 filter_expression, exclusions,
1643 bytecode,
1644 the_kernel_poll_pipe[1]) :
1645 cmd_disable_event(cmd_ctx, event,
1646 filter_expression, bytecode,
1647 exclusions);
1648 lttng_event_destroy(event);
1649 break;
1650 }
1651 case LTTNG_LIST_TRACEPOINTS:
1652 {
1653 enum lttng_error_code ret_code;
1654 size_t original_payload_size;
1655 size_t payload_size;
1656 const size_t command_header_size = sizeof(struct lttcomm_list_command_header);
1657
1658 ret = setup_empty_lttng_msg(cmd_ctx);
1659 if (ret) {
1660 ret = LTTNG_ERR_NOMEM;
1661 goto setup_error;
1662 }
1663
1664 original_payload_size = cmd_ctx->reply_payload.buffer.size;
1665
1666 session_lock_list();
1667 ret_code = cmd_list_tracepoints(cmd_ctx->lsm.domain.type,
1668 &cmd_ctx->reply_payload);
1669 session_unlock_list();
1670 if (ret_code != LTTNG_OK) {
1671 ret = (int) ret_code;
1672 goto error;
1673 }
1674
1675 payload_size = cmd_ctx->reply_payload.buffer.size -
1676 command_header_size - original_payload_size;
1677 update_lttng_msg(cmd_ctx, command_header_size, payload_size);
1678
1679 ret = LTTNG_OK;
1680 break;
1681 }
1682 case LTTNG_LIST_TRACEPOINT_FIELDS:
1683 {
1684 enum lttng_error_code ret_code;
1685 size_t original_payload_size;
1686 size_t payload_size;
1687 const size_t command_header_size = sizeof(struct lttcomm_list_command_header);
1688
1689 ret = setup_empty_lttng_msg(cmd_ctx);
1690 if (ret) {
1691 ret = LTTNG_ERR_NOMEM;
1692 goto setup_error;
1693 }
1694
1695 original_payload_size = cmd_ctx->reply_payload.buffer.size;
1696
1697 session_lock_list();
1698 ret_code = cmd_list_tracepoint_fields(
1699 cmd_ctx->lsm.domain.type, &cmd_ctx->reply_payload);
1700 session_unlock_list();
1701 if (ret_code != LTTNG_OK) {
1702 ret = (int) ret_code;
1703 goto error;
1704 }
1705
1706 payload_size = cmd_ctx->reply_payload.buffer.size -
1707 command_header_size - original_payload_size;
1708 update_lttng_msg(cmd_ctx, command_header_size, payload_size);
1709
1710 ret = LTTNG_OK;
1711 break;
1712 }
1713 case LTTNG_LIST_SYSCALLS:
1714 {
1715 enum lttng_error_code ret_code;
1716 size_t original_payload_size;
1717 size_t payload_size;
1718 const size_t command_header_size = sizeof(struct lttcomm_list_command_header);
1719
1720 ret = setup_empty_lttng_msg(cmd_ctx);
1721 if (ret) {
1722 ret = LTTNG_ERR_NOMEM;
1723 goto setup_error;
1724 }
1725
1726 original_payload_size = cmd_ctx->reply_payload.buffer.size;
1727
1728 ret_code = cmd_list_syscalls(&cmd_ctx->reply_payload);
1729 if (ret_code != LTTNG_OK) {
1730 ret = (int) ret_code;
1731 goto error;
1732 }
1733
1734 payload_size = cmd_ctx->reply_payload.buffer.size -
1735 command_header_size - original_payload_size;
1736 update_lttng_msg(cmd_ctx, command_header_size, payload_size);
1737
1738 ret = LTTNG_OK;
1739 break;
1740 }
1741 case LTTNG_SET_CONSUMER_URI:
1742 {
1743 size_t nb_uri, len;
1744 struct lttng_uri *uris;
1745
1746 nb_uri = cmd_ctx->lsm.u.uri.size;
1747 len = nb_uri * sizeof(struct lttng_uri);
1748
1749 if (nb_uri == 0) {
1750 ret = LTTNG_ERR_INVALID;
1751 goto error;
1752 }
1753
1754 uris = calloc<lttng_uri>(nb_uri);
1755 if (uris == NULL) {
1756 ret = LTTNG_ERR_FATAL;
1757 goto error;
1758 }
1759
1760 /* Receive variable len data */
1761 DBG("Receiving %zu URI(s) from client ...", nb_uri);
1762 ret = lttcomm_recv_unix_sock(*sock, uris, len);
1763 if (ret <= 0) {
1764 DBG("No URIs received from client... continuing");
1765 *sock_error = 1;
1766 ret = LTTNG_ERR_SESSION_FAIL;
1767 free(uris);
1768 goto error;
1769 }
1770
1771 ret = cmd_set_consumer_uri(cmd_ctx->session, nb_uri, uris);
1772 free(uris);
1773 if (ret != LTTNG_OK) {
1774 goto error;
1775 }
1776
1777
1778 break;
1779 }
1780 case LTTNG_START_TRACE:
1781 {
1782 /*
1783 * On the first start, if we have a kernel session and we have
1784 * enabled time or size-based rotations, we have to make sure
1785 * the kernel tracer supports it.
1786 */
1787 if (!cmd_ctx->session->has_been_started && \
1788 cmd_ctx->session->kernel_session && \
1789 (cmd_ctx->session->rotate_timer_period || \
1790 cmd_ctx->session->rotate_size) && \
1791 !check_rotate_compatible()) {
1792 DBG("Kernel tracer version is not compatible with the rotation feature");
1793 ret = LTTNG_ERR_ROTATION_WRONG_VERSION;
1794 goto error;
1795 }
1796 ret = cmd_start_trace(cmd_ctx->session);
1797 break;
1798 }
1799 case LTTNG_STOP_TRACE:
1800 {
1801 ret = cmd_stop_trace(cmd_ctx->session);
1802 break;
1803 }
1804 case LTTNG_DESTROY_SESSION:
1805 {
1806 ret = cmd_destroy_session(cmd_ctx->session,
1807 the_notification_thread_handle, sock);
1808 break;
1809 }
1810 case LTTNG_LIST_DOMAINS:
1811 {
1812 ssize_t nb_dom;
1813 struct lttng_domain *domains = NULL;
1814
1815 nb_dom = cmd_list_domains(cmd_ctx->session, &domains);
1816 if (nb_dom < 0) {
1817 /* Return value is a negative lttng_error_code. */
1818 ret = -nb_dom;
1819 goto error;
1820 }
1821
1822 ret = setup_lttng_msg_no_cmd_header(cmd_ctx, domains,
1823 nb_dom * sizeof(struct lttng_domain));
1824 free(domains);
1825
1826 if (ret < 0) {
1827 goto setup_error;
1828 }
1829
1830 ret = LTTNG_OK;
1831 break;
1832 }
1833 case LTTNG_LIST_CHANNELS:
1834 {
1835 enum lttng_error_code ret_code;
1836 size_t original_payload_size;
1837 size_t payload_size;
1838 const size_t command_header_size = sizeof(struct lttcomm_list_command_header);
1839
1840 ret = setup_empty_lttng_msg(cmd_ctx);
1841 if (ret) {
1842 ret = LTTNG_ERR_NOMEM;
1843 goto setup_error;
1844 }
1845
1846 original_payload_size = cmd_ctx->reply_payload.buffer.size;
1847
1848 ret_code = cmd_list_channels(cmd_ctx->lsm.domain.type,
1849 cmd_ctx->session, &cmd_ctx->reply_payload);
1850 if (ret_code != LTTNG_OK) {
1851 ret = (int) ret_code;
1852 goto error;
1853 }
1854
1855 payload_size = cmd_ctx->reply_payload.buffer.size -
1856 command_header_size - original_payload_size;
1857 update_lttng_msg(cmd_ctx, command_header_size, payload_size);
1858
1859 ret = LTTNG_OK;
1860 break;
1861 }
1862 case LTTNG_LIST_EVENTS:
1863 {
1864 enum lttng_error_code ret_code;
1865 size_t original_payload_size;
1866 size_t payload_size;
1867 const size_t command_header_size = sizeof(struct lttcomm_list_command_header);
1868
1869 ret = setup_empty_lttng_msg(cmd_ctx);
1870 if (ret) {
1871 ret = LTTNG_ERR_NOMEM;
1872 goto setup_error;
1873 }
1874
1875 original_payload_size = cmd_ctx->reply_payload.buffer.size;
1876
1877 ret_code = cmd_list_events(cmd_ctx->lsm.domain.type,
1878 cmd_ctx->session,
1879 cmd_ctx->lsm.u.list.channel_name, &cmd_ctx->reply_payload);
1880 if (ret_code != LTTNG_OK) {
1881 ret = (int) ret_code;
1882 goto error;
1883 }
1884
1885 payload_size = cmd_ctx->reply_payload.buffer.size -
1886 command_header_size - original_payload_size;
1887 update_lttng_msg(cmd_ctx, command_header_size, payload_size);
1888
1889 ret = LTTNG_OK;
1890 break;
1891 }
1892 case LTTNG_LIST_SESSIONS:
1893 {
1894 unsigned int nr_sessions;
1895 lttng_session *sessions_payload = nullptr;
1896 size_t payload_len = 0;
1897
1898 session_lock_list();
1899 nr_sessions = lttng_sessions_count(
1900 LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds),
1901 LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds));
1902
1903 if (nr_sessions > 0) {
1904 payload_len = (sizeof(struct lttng_session) *
1905 nr_sessions) +
1906 (sizeof(struct lttng_session_extended) *
1907 nr_sessions);
1908 sessions_payload = zmalloc<lttng_session>(payload_len);
1909 if (!sessions_payload) {
1910 session_unlock_list();
1911 ret = -ENOMEM;
1912 goto setup_error;
1913 }
1914
1915 cmd_list_lttng_sessions(sessions_payload, nr_sessions,
1916 LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds),
1917 LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds));
1918 }
1919
1920 session_unlock_list();
1921
1922 ret = setup_lttng_msg_no_cmd_header(
1923 cmd_ctx, sessions_payload, payload_len);
1924 free(sessions_payload);
1925
1926 if (ret < 0) {
1927 goto setup_error;
1928 }
1929
1930 ret = LTTNG_OK;
1931 break;
1932 }
1933 case LTTNG_REGISTER_CONSUMER:
1934 {
1935 struct consumer_data *cdata;
1936
1937 switch (cmd_ctx->lsm.domain.type) {
1938 case LTTNG_DOMAIN_KERNEL:
1939 cdata = &the_kconsumer_data;
1940 break;
1941 default:
1942 ret = LTTNG_ERR_UND;
1943 goto error;
1944 }
1945
1946 ret = cmd_register_consumer(cmd_ctx->session, cmd_ctx->lsm.domain.type,
1947 cmd_ctx->lsm.u.reg.path, cdata);
1948 break;
1949 }
1950 case LTTNG_DATA_PENDING:
1951 {
1952 int pending_ret;
1953 uint8_t pending_ret_byte;
1954
1955 pending_ret = cmd_data_pending(cmd_ctx->session);
1956
1957 /*
1958 * FIXME
1959 *
1960 * This function may returns 0 or 1 to indicate whether or not
1961 * there is data pending. In case of error, it should return an
1962 * LTTNG_ERR code. However, some code paths may still return
1963 * a nondescript error code, which we handle by returning an
1964 * "unknown" error.
1965 */
1966 if (pending_ret == 0 || pending_ret == 1) {
1967 /*
1968 * ret will be set to LTTNG_OK at the end of
1969 * this function.
1970 */
1971 } else if (pending_ret < 0) {
1972 ret = LTTNG_ERR_UNK;
1973 goto setup_error;
1974 } else {
1975 ret = pending_ret;
1976 goto setup_error;
1977 }
1978
1979 pending_ret_byte = (uint8_t) pending_ret;
1980
1981 /* 1 byte to return whether or not data is pending */
1982 ret = setup_lttng_msg_no_cmd_header(cmd_ctx,
1983 &pending_ret_byte, 1);
1984
1985 if (ret < 0) {
1986 goto setup_error;
1987 }
1988
1989 ret = LTTNG_OK;
1990 break;
1991 }
1992 case LTTNG_SNAPSHOT_ADD_OUTPUT:
1993 {
1994 uint32_t snapshot_id;
1995 struct lttcomm_lttng_output_id reply;
1996 lttng_snapshot_output output = cmd_ctx->lsm.u.snapshot_output.output;
1997
1998 ret = cmd_snapshot_add_output(cmd_ctx->session,
1999 &output,
2000 &snapshot_id);
2001 if (ret != LTTNG_OK) {
2002 goto error;
2003 }
2004 reply.id = snapshot_id;
2005
2006 ret = setup_lttng_msg_no_cmd_header(cmd_ctx, &reply,
2007 sizeof(reply));
2008 if (ret < 0) {
2009 goto setup_error;
2010 }
2011
2012 /* Copy output list into message payload */
2013 ret = LTTNG_OK;
2014 break;
2015 }
2016 case LTTNG_SNAPSHOT_DEL_OUTPUT:
2017 {
2018 lttng_snapshot_output output = cmd_ctx->lsm.u.snapshot_output.output;
2019 ret = cmd_snapshot_del_output(cmd_ctx->session, &output);
2020 break;
2021 }
2022 case LTTNG_SNAPSHOT_LIST_OUTPUT:
2023 {
2024 ssize_t nb_output;
2025 struct lttng_snapshot_output *outputs = NULL;
2026
2027 nb_output = cmd_snapshot_list_outputs(cmd_ctx->session, &outputs);
2028 if (nb_output < 0) {
2029 ret = -nb_output;
2030 goto error;
2031 }
2032
2033 LTTNG_ASSERT((nb_output > 0 && outputs) || nb_output == 0);
2034 ret = setup_lttng_msg_no_cmd_header(cmd_ctx, outputs,
2035 nb_output * sizeof(struct lttng_snapshot_output));
2036 free(outputs);
2037
2038 if (ret < 0) {
2039 goto setup_error;
2040 }
2041
2042 ret = LTTNG_OK;
2043 break;
2044 }
2045 case LTTNG_SNAPSHOT_RECORD:
2046 {
2047 lttng_snapshot_output output = cmd_ctx->lsm.u.snapshot_record.output;
2048 ret = cmd_snapshot_record(cmd_ctx->session,
2049 &output, 0); // RFC: set to zero since it's ignored by cmd_snapshot_record
2050 break;
2051 }
2052 case LTTNG_CREATE_SESSION_EXT:
2053 {
2054 struct lttng_dynamic_buffer payload;
2055 struct lttng_session_descriptor *return_descriptor = NULL;
2056
2057 lttng_dynamic_buffer_init(&payload);
2058 ret = cmd_create_session(cmd_ctx, *sock, &return_descriptor);
2059 if (ret != LTTNG_OK) {
2060 goto error;
2061 }
2062
2063 ret = lttng_session_descriptor_serialize(return_descriptor,
2064 &payload);
2065 if (ret) {
2066 ERR("Failed to serialize session descriptor in reply to \"create session\" command");
2067 lttng_session_descriptor_destroy(return_descriptor);
2068 ret = LTTNG_ERR_NOMEM;
2069 goto error;
2070 }
2071 ret = setup_lttng_msg_no_cmd_header(cmd_ctx, payload.data,
2072 payload.size);
2073 if (ret) {
2074 lttng_session_descriptor_destroy(return_descriptor);
2075 ret = LTTNG_ERR_NOMEM;
2076 goto error;
2077 }
2078 lttng_dynamic_buffer_reset(&payload);
2079 lttng_session_descriptor_destroy(return_descriptor);
2080 ret = LTTNG_OK;
2081 break;
2082 }
2083 case LTTNG_SAVE_SESSION:
2084 {
2085 ret = cmd_save_sessions(&cmd_ctx->lsm.u.save_session.attr,
2086 &cmd_ctx->creds);
2087 break;
2088 }
2089 case LTTNG_SET_SESSION_SHM_PATH:
2090 {
2091 ret = cmd_set_session_shm_path(cmd_ctx->session,
2092 cmd_ctx->lsm.u.set_shm_path.shm_path);
2093 break;
2094 }
2095 case LTTNG_REGENERATE_METADATA:
2096 {
2097 ret = cmd_regenerate_metadata(cmd_ctx->session);
2098 break;
2099 }
2100 case LTTNG_REGENERATE_STATEDUMP:
2101 {
2102 ret = cmd_regenerate_statedump(cmd_ctx->session);
2103 break;
2104 }
2105 case LTTNG_REGISTER_TRIGGER:
2106 {
2107 struct lttng_trigger *payload_trigger;
2108 struct lttng_trigger *return_trigger;
2109 size_t original_reply_payload_size;
2110 size_t reply_payload_size;
2111 const struct lttng_credentials cmd_creds = {
2112 .uid = LTTNG_OPTIONAL_INIT_VALUE(cmd_ctx->creds.uid),
2113 .gid = LTTNG_OPTIONAL_INIT_VALUE(cmd_ctx->creds.gid),
2114 };
2115
2116 ret = setup_empty_lttng_msg(cmd_ctx);
2117 if (ret) {
2118 ret = LTTNG_ERR_NOMEM;
2119 goto setup_error;
2120 }
2121
2122 ret = receive_lttng_trigger(
2123 cmd_ctx, *sock, sock_error, &payload_trigger);
2124 if (ret != LTTNG_OK) {
2125 goto error;
2126 }
2127
2128 original_reply_payload_size = cmd_ctx->reply_payload.buffer.size;
2129
2130 ret = cmd_register_trigger(&cmd_creds, payload_trigger,
2131 cmd_ctx->lsm.u.trigger.is_trigger_anonymous,
2132 the_notification_thread_handle,
2133 &return_trigger);
2134 if (ret != LTTNG_OK) {
2135 lttng_trigger_put(payload_trigger);
2136 goto error;
2137 }
2138
2139 ret = lttng_trigger_serialize(return_trigger, &cmd_ctx->reply_payload);
2140 lttng_trigger_put(payload_trigger);
2141 lttng_trigger_put(return_trigger);
2142 if (ret) {
2143 ERR("Failed to serialize trigger in reply to \"register trigger\" command");
2144 ret = LTTNG_ERR_NOMEM;
2145 goto error;
2146 }
2147
2148 reply_payload_size = cmd_ctx->reply_payload.buffer.size -
2149 original_reply_payload_size;
2150
2151 update_lttng_msg(cmd_ctx, 0, reply_payload_size);
2152
2153 ret = LTTNG_OK;
2154 break;
2155 }
2156 case LTTNG_UNREGISTER_TRIGGER:
2157 {
2158 struct lttng_trigger *payload_trigger;
2159 const struct lttng_credentials cmd_creds = {
2160 .uid = LTTNG_OPTIONAL_INIT_VALUE(cmd_ctx->creds.uid),
2161 .gid = LTTNG_OPTIONAL_INIT_VALUE(cmd_ctx->creds.gid),
2162 };
2163
2164 ret = receive_lttng_trigger(
2165 cmd_ctx, *sock, sock_error, &payload_trigger);
2166 if (ret != LTTNG_OK) {
2167 goto error;
2168 }
2169
2170 ret = cmd_unregister_trigger(&cmd_creds, payload_trigger,
2171 the_notification_thread_handle);
2172 lttng_trigger_put(payload_trigger);
2173 break;
2174 }
2175 case LTTNG_ROTATE_SESSION:
2176 {
2177 struct lttng_rotate_session_return rotate_return;
2178
2179 DBG("Client rotate session \"%s\"", cmd_ctx->session->name);
2180
2181 memset(&rotate_return, 0, sizeof(rotate_return));
2182 if (cmd_ctx->session->kernel_session && !check_rotate_compatible()) {
2183 DBG("Kernel tracer version is not compatible with the rotation feature");
2184 ret = LTTNG_ERR_ROTATION_WRONG_VERSION;
2185 goto error;
2186 }
2187
2188 ret = cmd_rotate_session(cmd_ctx->session, &rotate_return,
2189 false,
2190 LTTNG_TRACE_CHUNK_COMMAND_TYPE_MOVE_TO_COMPLETED);
2191 if (ret < 0) {
2192 ret = -ret;
2193 goto error;
2194 }
2195
2196 ret = setup_lttng_msg_no_cmd_header(cmd_ctx, &rotate_return,
2197 sizeof(rotate_return));
2198 if (ret < 0) {
2199 ret = -ret;
2200 goto error;
2201 }
2202
2203 ret = LTTNG_OK;
2204 break;
2205 }
2206 case LTTNG_ROTATION_GET_INFO:
2207 {
2208 struct lttng_rotation_get_info_return get_info_return;
2209
2210 memset(&get_info_return, 0, sizeof(get_info_return));
2211 ret = cmd_rotate_get_info(cmd_ctx->session, &get_info_return,
2212 cmd_ctx->lsm.u.get_rotation_info.rotation_id);
2213 if (ret < 0) {
2214 ret = -ret;
2215 goto error;
2216 }
2217
2218 ret = setup_lttng_msg_no_cmd_header(cmd_ctx, &get_info_return,
2219 sizeof(get_info_return));
2220 if (ret < 0) {
2221 ret = -ret;
2222 goto error;
2223 }
2224
2225 ret = LTTNG_OK;
2226 break;
2227 }
2228 case LTTNG_ROTATION_SET_SCHEDULE:
2229 {
2230 bool set_schedule;
2231 enum lttng_rotation_schedule_type schedule_type;
2232 uint64_t value;
2233
2234 if (cmd_ctx->session->kernel_session && !check_rotate_compatible()) {
2235 DBG("Kernel tracer version does not support session rotations");
2236 ret = LTTNG_ERR_ROTATION_WRONG_VERSION;
2237 goto error;
2238 }
2239
2240 set_schedule = cmd_ctx->lsm.u.rotation_set_schedule.set == 1;
2241 schedule_type = (enum lttng_rotation_schedule_type) cmd_ctx->lsm.u.rotation_set_schedule.type;
2242 value = cmd_ctx->lsm.u.rotation_set_schedule.value;
2243
2244 ret = cmd_rotation_set_schedule(cmd_ctx->session, set_schedule,
2245 schedule_type, value,
2246 the_notification_thread_handle);
2247 if (ret != LTTNG_OK) {
2248 goto error;
2249 }
2250
2251 break;
2252 }
2253 case LTTNG_SESSION_LIST_ROTATION_SCHEDULES:
2254 {
2255 lttng_session_list_schedules_return schedules;
2256
2257 schedules.periodic.set = !!cmd_ctx->session->rotate_timer_period;
2258 schedules.periodic.value = cmd_ctx->session->rotate_timer_period;
2259 schedules.size.set = !!cmd_ctx->session->rotate_size;
2260 schedules.size.value = cmd_ctx->session->rotate_size;
2261
2262 ret = setup_lttng_msg_no_cmd_header(cmd_ctx, &schedules,
2263 sizeof(schedules));
2264 if (ret < 0) {
2265 ret = -ret;
2266 goto error;
2267 }
2268
2269 ret = LTTNG_OK;
2270 break;
2271 }
2272 case LTTNG_CLEAR_SESSION:
2273 {
2274 ret = cmd_clear_session(cmd_ctx->session, sock);
2275 break;
2276 }
2277 case LTTNG_LIST_TRIGGERS:
2278 {
2279 struct lttng_triggers *return_triggers = NULL;
2280 size_t original_payload_size;
2281 size_t payload_size;
2282
2283 ret = setup_empty_lttng_msg(cmd_ctx);
2284 if (ret) {
2285 ret = LTTNG_ERR_NOMEM;
2286 goto setup_error;
2287 }
2288
2289 original_payload_size = cmd_ctx->reply_payload.buffer.size;
2290
2291 ret = cmd_list_triggers(cmd_ctx, the_notification_thread_handle,
2292 &return_triggers);
2293 if (ret != LTTNG_OK) {
2294 goto error;
2295 }
2296
2297 LTTNG_ASSERT(return_triggers);
2298 ret = lttng_triggers_serialize(
2299 return_triggers, &cmd_ctx->reply_payload);
2300 lttng_triggers_destroy(return_triggers);
2301 if (ret) {
2302 ERR("Failed to serialize triggers in reply to `list triggers` command");
2303 ret = LTTNG_ERR_NOMEM;
2304 goto error;
2305 }
2306
2307 payload_size = cmd_ctx->reply_payload.buffer.size -
2308 original_payload_size;
2309
2310 update_lttng_msg(cmd_ctx, 0, payload_size);
2311
2312 ret = LTTNG_OK;
2313 break;
2314 }
2315 case LTTNG_EXECUTE_ERROR_QUERY:
2316 {
2317 struct lttng_error_query *query;
2318 const struct lttng_credentials cmd_creds = {
2319 .uid = LTTNG_OPTIONAL_INIT_VALUE(cmd_ctx->creds.uid),
2320 .gid = LTTNG_OPTIONAL_INIT_VALUE(cmd_ctx->creds.gid),
2321 };
2322 struct lttng_error_query_results *results = NULL;
2323 size_t original_payload_size;
2324 size_t payload_size;
2325
2326 ret = setup_empty_lttng_msg(cmd_ctx);
2327 if (ret) {
2328 ret = LTTNG_ERR_NOMEM;
2329 goto setup_error;
2330 }
2331
2332 original_payload_size = cmd_ctx->reply_payload.buffer.size;
2333
2334 ret = receive_lttng_error_query(
2335 cmd_ctx, *sock, sock_error, &query);
2336 if (ret != LTTNG_OK) {
2337 goto error;
2338 }
2339
2340 ret = cmd_execute_error_query(&cmd_creds, query, &results,
2341 the_notification_thread_handle);
2342 lttng_error_query_destroy(query);
2343 if (ret != LTTNG_OK) {
2344 goto error;
2345 }
2346
2347 LTTNG_ASSERT(results);
2348 ret = lttng_error_query_results_serialize(
2349 results, &cmd_ctx->reply_payload);
2350 lttng_error_query_results_destroy(results);
2351 if (ret) {
2352 ERR("Failed to serialize error query result set in reply to `execute error query` command");
2353 ret = LTTNG_ERR_NOMEM;
2354 goto error;
2355 }
2356
2357 payload_size = cmd_ctx->reply_payload.buffer.size -
2358 original_payload_size;
2359
2360 update_lttng_msg(cmd_ctx, 0, payload_size);
2361
2362 ret = LTTNG_OK;
2363
2364 break;
2365 }
2366 default:
2367 ret = LTTNG_ERR_UND;
2368 break;
2369 }
2370
2371 error:
2372 if (cmd_ctx->reply_payload.buffer.size == 0) {
2373 DBG("Missing llm header, creating one.");
2374 if (setup_lttng_msg_no_cmd_header(cmd_ctx, NULL, 0) < 0) {
2375 goto setup_error;
2376 }
2377 }
2378 /* Set return code */
2379 ((struct lttcomm_lttng_msg *) (cmd_ctx->reply_payload.buffer.data))->ret_code = ret;
2380 setup_error:
2381 if (cmd_ctx->session) {
2382 session_unlock(cmd_ctx->session);
2383 session_put(cmd_ctx->session);
2384 cmd_ctx->session = NULL;
2385 }
2386 if (need_tracing_session) {
2387 session_unlock_list();
2388 }
2389 init_setup_error:
2390 LTTNG_ASSERT(!rcu_read_ongoing());
2391 return ret;
2392 }
2393
2394 static int create_client_sock(void)
2395 {
2396 int ret, client_sock;
2397 const mode_t old_umask = umask(0);
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 umask(old_umask);
2432 return ret;
2433 }
2434
2435 static void cleanup_client_thread(void *data)
2436 {
2437 struct lttng_pipe *quit_pipe = (lttng_pipe *) data;
2438
2439 lttng_pipe_destroy(quit_pipe);
2440 }
2441
2442 static void thread_init_cleanup(void *data __attribute__((unused)))
2443 {
2444 set_thread_status(false);
2445 }
2446
2447 /*
2448 * This thread manage all clients request using the unix client socket for
2449 * communication.
2450 */
2451 static void *thread_manage_clients(void *data)
2452 {
2453 int sock = -1, ret, i, pollfd, err = -1;
2454 int sock_error;
2455 uint32_t revents, nb_fd;
2456 struct lttng_poll_event events;
2457 const int client_sock = thread_state.client_sock;
2458 struct lttng_pipe *quit_pipe = (lttng_pipe *) data;
2459 const int thread_quit_pipe_fd = lttng_pipe_get_readfd(quit_pipe);
2460 struct command_ctx cmd_ctx = {};
2461
2462 DBG("[thread] Manage client started");
2463
2464 lttng_payload_init(&cmd_ctx.reply_payload);
2465
2466 is_root = (getuid() == 0);
2467
2468 pthread_cleanup_push(thread_init_cleanup, NULL);
2469
2470 rcu_register_thread();
2471
2472 health_register(the_health_sessiond, HEALTH_SESSIOND_TYPE_CMD);
2473
2474 health_code_update();
2475
2476 ret = lttcomm_listen_unix_sock(client_sock);
2477 if (ret < 0) {
2478 goto error_listen;
2479 }
2480
2481 /*
2482 * Pass 2 as size here for the thread quit pipe and client_sock. Nothing
2483 * more will be added to this poll set.
2484 */
2485 ret = lttng_poll_create(&events, 2, LTTNG_CLOEXEC);
2486 if (ret < 0) {
2487 goto error_create_poll;
2488 }
2489
2490 /* Add the application registration socket */
2491 ret = lttng_poll_add(&events, client_sock, LPOLLIN | LPOLLPRI);
2492 if (ret < 0) {
2493 goto error;
2494 }
2495
2496 /* Add thread quit pipe */
2497 ret = lttng_poll_add(&events, thread_quit_pipe_fd, LPOLLIN | LPOLLERR);
2498 if (ret < 0) {
2499 goto error;
2500 }
2501
2502 /* Set state as running. */
2503 set_thread_status(true);
2504 pthread_cleanup_pop(0);
2505
2506 /* This testpoint is after we signal readiness to the parent. */
2507 if (testpoint(sessiond_thread_manage_clients)) {
2508 goto error;
2509 }
2510
2511 if (testpoint(sessiond_thread_manage_clients_before_loop)) {
2512 goto error;
2513 }
2514
2515 health_code_update();
2516
2517 while (1) {
2518 const struct cmd_completion_handler *cmd_completion_handler;
2519
2520 cmd_ctx.creds.uid = UINT32_MAX;
2521 cmd_ctx.creds.gid = UINT32_MAX;
2522 cmd_ctx.creds.pid = 0;
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((lttcomm_sessiond_command) 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 LTTNG_ASSERT(cmd_ctx.reply_payload.buffer.size >= sizeof(*llm));
2672 LTTNG_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 = (lttng_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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