Tests: remove flaky '*' kernel wildcard test
[lttng-tools.git] / src / bin / lttng-sessiond / main.c
1 /*
2 * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
3 * Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
4 * 2013 - Jérémie Galarneau <jeremie.galarneau@efficios.com>
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License, version 2 only,
8 * as published by the Free Software Foundation.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License along
16 * with this program; if not, write to the Free Software Foundation, Inc.,
17 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
18 */
19
20 #define _LGPL_SOURCE
21 #include <getopt.h>
22 #include <grp.h>
23 #include <limits.h>
24 #include <paths.h>
25 #include <pthread.h>
26 #include <signal.h>
27 #include <stdio.h>
28 #include <stdlib.h>
29 #include <string.h>
30 #include <inttypes.h>
31 #include <sys/mman.h>
32 #include <sys/mount.h>
33 #include <sys/resource.h>
34 #include <sys/socket.h>
35 #include <sys/stat.h>
36 #include <sys/types.h>
37 #include <sys/wait.h>
38 #include <urcu/uatomic.h>
39 #include <unistd.h>
40
41 #include <common/common.h>
42 #include <common/compat/socket.h>
43 #include <common/compat/getenv.h>
44 #include <common/defaults.h>
45 #include <common/kernel-consumer/kernel-consumer.h>
46 #include <common/futex.h>
47 #include <common/relayd/relayd.h>
48 #include <common/utils.h>
49 #include <common/daemonize.h>
50 #include <common/config/session-config.h>
51
52 #include "lttng-sessiond.h"
53 #include "buffer-registry.h"
54 #include "channel.h"
55 #include "cmd.h"
56 #include "consumer.h"
57 #include "context.h"
58 #include "event.h"
59 #include "kernel.h"
60 #include "kernel-consumer.h"
61 #include "modprobe.h"
62 #include "shm.h"
63 #include "ust-ctl.h"
64 #include "ust-consumer.h"
65 #include "utils.h"
66 #include "fd-limit.h"
67 #include "health-sessiond.h"
68 #include "testpoint.h"
69 #include "ust-thread.h"
70 #include "agent-thread.h"
71 #include "save.h"
72 #include "load-session-thread.h"
73 #include "syscall.h"
74 #include "agent.h"
75
76 #define CONSUMERD_FILE "lttng-consumerd"
77
78 const char *progname;
79 static const char *tracing_group_name = DEFAULT_TRACING_GROUP;
80 static int tracing_group_name_override;
81 static char *opt_pidfile;
82 static int opt_sig_parent;
83 static int opt_verbose_consumer;
84 static int opt_daemon, opt_background;
85 static int opt_no_kernel;
86 static char *opt_load_session_path;
87 static pid_t ppid; /* Parent PID for --sig-parent option */
88 static pid_t child_ppid; /* Internal parent PID use with daemonize. */
89 static char *rundir;
90 static int lockfile_fd = -1;
91
92 /* Set to 1 when a SIGUSR1 signal is received. */
93 static int recv_child_signal;
94
95 /*
96 * Consumer daemon specific control data. Every value not initialized here is
97 * set to 0 by the static definition.
98 */
99 static struct consumer_data kconsumer_data = {
100 .type = LTTNG_CONSUMER_KERNEL,
101 .err_unix_sock_path = DEFAULT_KCONSUMERD_ERR_SOCK_PATH,
102 .cmd_unix_sock_path = DEFAULT_KCONSUMERD_CMD_SOCK_PATH,
103 .err_sock = -1,
104 .cmd_sock = -1,
105 .pid_mutex = PTHREAD_MUTEX_INITIALIZER,
106 .lock = PTHREAD_MUTEX_INITIALIZER,
107 .cond = PTHREAD_COND_INITIALIZER,
108 .cond_mutex = PTHREAD_MUTEX_INITIALIZER,
109 };
110 static struct consumer_data ustconsumer64_data = {
111 .type = LTTNG_CONSUMER64_UST,
112 .err_unix_sock_path = DEFAULT_USTCONSUMERD64_ERR_SOCK_PATH,
113 .cmd_unix_sock_path = DEFAULT_USTCONSUMERD64_CMD_SOCK_PATH,
114 .err_sock = -1,
115 .cmd_sock = -1,
116 .pid_mutex = PTHREAD_MUTEX_INITIALIZER,
117 .lock = PTHREAD_MUTEX_INITIALIZER,
118 .cond = PTHREAD_COND_INITIALIZER,
119 .cond_mutex = PTHREAD_MUTEX_INITIALIZER,
120 };
121 static struct consumer_data ustconsumer32_data = {
122 .type = LTTNG_CONSUMER32_UST,
123 .err_unix_sock_path = DEFAULT_USTCONSUMERD32_ERR_SOCK_PATH,
124 .cmd_unix_sock_path = DEFAULT_USTCONSUMERD32_CMD_SOCK_PATH,
125 .err_sock = -1,
126 .cmd_sock = -1,
127 .pid_mutex = PTHREAD_MUTEX_INITIALIZER,
128 .lock = PTHREAD_MUTEX_INITIALIZER,
129 .cond = PTHREAD_COND_INITIALIZER,
130 .cond_mutex = PTHREAD_MUTEX_INITIALIZER,
131 };
132
133 /* Command line options */
134 static const struct option long_options[] = {
135 { "client-sock", required_argument, 0, 'c' },
136 { "apps-sock", required_argument, 0, 'a' },
137 { "kconsumerd-cmd-sock", required_argument, 0, '\0' },
138 { "kconsumerd-err-sock", required_argument, 0, '\0' },
139 { "ustconsumerd32-cmd-sock", required_argument, 0, '\0' },
140 { "ustconsumerd32-err-sock", required_argument, 0, '\0' },
141 { "ustconsumerd64-cmd-sock", required_argument, 0, '\0' },
142 { "ustconsumerd64-err-sock", required_argument, 0, '\0' },
143 { "consumerd32-path", required_argument, 0, '\0' },
144 { "consumerd32-libdir", required_argument, 0, '\0' },
145 { "consumerd64-path", required_argument, 0, '\0' },
146 { "consumerd64-libdir", required_argument, 0, '\0' },
147 { "daemonize", no_argument, 0, 'd' },
148 { "background", no_argument, 0, 'b' },
149 { "sig-parent", no_argument, 0, 'S' },
150 { "help", no_argument, 0, 'h' },
151 { "group", required_argument, 0, 'g' },
152 { "version", no_argument, 0, 'V' },
153 { "quiet", no_argument, 0, 'q' },
154 { "verbose", no_argument, 0, 'v' },
155 { "verbose-consumer", no_argument, 0, '\0' },
156 { "no-kernel", no_argument, 0, '\0' },
157 { "pidfile", required_argument, 0, 'p' },
158 { "agent-tcp-port", required_argument, 0, '\0' },
159 { "config", required_argument, 0, 'f' },
160 { "load", required_argument, 0, 'l' },
161 { "kmod-probes", required_argument, 0, '\0' },
162 { "extra-kmod-probes", required_argument, 0, '\0' },
163 { NULL, 0, 0, 0 }
164 };
165
166 /* Command line options to ignore from configuration file */
167 static const char *config_ignore_options[] = { "help", "version", "config" };
168
169 /* Shared between threads */
170 static int dispatch_thread_exit;
171
172 /* Global application Unix socket path */
173 static char apps_unix_sock_path[PATH_MAX];
174 /* Global client Unix socket path */
175 static char client_unix_sock_path[PATH_MAX];
176 /* global wait shm path for UST */
177 static char wait_shm_path[PATH_MAX];
178 /* Global health check unix path */
179 static char health_unix_sock_path[PATH_MAX];
180
181 /* Sockets and FDs */
182 static int client_sock = -1;
183 static int apps_sock = -1;
184 int kernel_tracer_fd = -1;
185 static int kernel_poll_pipe[2] = { -1, -1 };
186
187 /*
188 * Quit pipe for all threads. This permits a single cancellation point
189 * for all threads when receiving an event on the pipe.
190 */
191 static int thread_quit_pipe[2] = { -1, -1 };
192 static int ht_cleanup_quit_pipe[2] = { -1, -1 };
193
194 /*
195 * This pipe is used to inform the thread managing application communication
196 * that a command is queued and ready to be processed.
197 */
198 static int apps_cmd_pipe[2] = { -1, -1 };
199
200 int apps_cmd_notify_pipe[2] = { -1, -1 };
201
202 /* Pthread, Mutexes and Semaphores */
203 static pthread_t apps_thread;
204 static pthread_t apps_notify_thread;
205 static pthread_t reg_apps_thread;
206 static pthread_t client_thread;
207 static pthread_t kernel_thread;
208 static pthread_t dispatch_thread;
209 static pthread_t health_thread;
210 static pthread_t ht_cleanup_thread;
211 static pthread_t agent_reg_thread;
212 static pthread_t load_session_thread;
213
214 /*
215 * UST registration command queue. This queue is tied with a futex and uses a N
216 * wakers / 1 waiter implemented and detailed in futex.c/.h
217 *
218 * The thread_registration_apps and thread_dispatch_ust_registration uses this
219 * queue along with the wait/wake scheme. The thread_manage_apps receives down
220 * the line new application socket and monitors it for any I/O error or clean
221 * close that triggers an unregistration of the application.
222 */
223 static struct ust_cmd_queue ust_cmd_queue;
224
225 /*
226 * Pointer initialized before thread creation.
227 *
228 * This points to the tracing session list containing the session count and a
229 * mutex lock. The lock MUST be taken if you iterate over the list. The lock
230 * MUST NOT be taken if you call a public function in session.c.
231 *
232 * The lock is nested inside the structure: session_list_ptr->lock. Please use
233 * session_lock_list and session_unlock_list for lock acquisition.
234 */
235 static struct ltt_session_list *session_list_ptr;
236
237 int ust_consumerd64_fd = -1;
238 int ust_consumerd32_fd = -1;
239
240 static const char *consumerd32_bin = CONFIG_CONSUMERD32_BIN;
241 static const char *consumerd64_bin = CONFIG_CONSUMERD64_BIN;
242 static const char *consumerd32_libdir = CONFIG_CONSUMERD32_LIBDIR;
243 static const char *consumerd64_libdir = CONFIG_CONSUMERD64_LIBDIR;
244 static int consumerd32_bin_override;
245 static int consumerd64_bin_override;
246 static int consumerd32_libdir_override;
247 static int consumerd64_libdir_override;
248
249 static const char *module_proc_lttng = "/proc/lttng";
250
251 /*
252 * Consumer daemon state which is changed when spawning it, killing it or in
253 * case of a fatal error.
254 */
255 enum consumerd_state {
256 CONSUMER_STARTED = 1,
257 CONSUMER_STOPPED = 2,
258 CONSUMER_ERROR = 3,
259 };
260
261 /*
262 * This consumer daemon state is used to validate if a client command will be
263 * able to reach the consumer. If not, the client is informed. For instance,
264 * doing a "lttng start" when the consumer state is set to ERROR will return an
265 * error to the client.
266 *
267 * The following example shows a possible race condition of this scheme:
268 *
269 * consumer thread error happens
270 * client cmd arrives
271 * client cmd checks state -> still OK
272 * consumer thread exit, sets error
273 * client cmd try to talk to consumer
274 * ...
275 *
276 * However, since the consumer is a different daemon, we have no way of making
277 * sure the command will reach it safely even with this state flag. This is why
278 * we consider that up to the state validation during command processing, the
279 * command is safe. After that, we can not guarantee the correctness of the
280 * client request vis-a-vis the consumer.
281 */
282 static enum consumerd_state ust_consumerd_state;
283 static enum consumerd_state kernel_consumerd_state;
284
285 /*
286 * Socket timeout for receiving and sending in seconds.
287 */
288 static int app_socket_timeout;
289
290 /* Set in main() with the current page size. */
291 long page_size;
292
293 /* Application health monitoring */
294 struct health_app *health_sessiond;
295
296 /* Agent TCP port for registration. Used by the agent thread. */
297 unsigned int agent_tcp_port = DEFAULT_AGENT_TCP_PORT;
298
299 /* Am I root or not. */
300 int is_root; /* Set to 1 if the daemon is running as root */
301
302 const char * const config_section_name = "sessiond";
303
304 /* Load session thread information to operate. */
305 struct load_session_thread_data *load_info;
306
307 /* Global hash tables */
308 struct lttng_ht *agent_apps_ht_by_sock = NULL;
309
310 /*
311 * Whether sessiond is ready for commands/health check requests.
312 * NR_LTTNG_SESSIOND_READY must match the number of calls to
313 * sessiond_notify_ready().
314 */
315 #define NR_LTTNG_SESSIOND_READY 3
316 int lttng_sessiond_ready = NR_LTTNG_SESSIOND_READY;
317
318 /* Notify parents that we are ready for cmd and health check */
319 LTTNG_HIDDEN
320 void sessiond_notify_ready(void)
321 {
322 if (uatomic_sub_return(&lttng_sessiond_ready, 1) == 0) {
323 /*
324 * Notify parent pid that we are ready to accept command
325 * for client side. This ppid is the one from the
326 * external process that spawned us.
327 */
328 if (opt_sig_parent) {
329 kill(ppid, SIGUSR1);
330 }
331
332 /*
333 * Notify the parent of the fork() process that we are
334 * ready.
335 */
336 if (opt_daemon || opt_background) {
337 kill(child_ppid, SIGUSR1);
338 }
339 }
340 }
341
342 static
343 void setup_consumerd_path(void)
344 {
345 const char *bin, *libdir;
346
347 /*
348 * Allow INSTALL_BIN_PATH to be used as a target path for the
349 * native architecture size consumer if CONFIG_CONSUMER*_PATH
350 * has not been defined.
351 */
352 #if (CAA_BITS_PER_LONG == 32)
353 if (!consumerd32_bin[0]) {
354 consumerd32_bin = INSTALL_BIN_PATH "/" CONSUMERD_FILE;
355 }
356 if (!consumerd32_libdir[0]) {
357 consumerd32_libdir = INSTALL_LIB_PATH;
358 }
359 #elif (CAA_BITS_PER_LONG == 64)
360 if (!consumerd64_bin[0]) {
361 consumerd64_bin = INSTALL_BIN_PATH "/" CONSUMERD_FILE;
362 }
363 if (!consumerd64_libdir[0]) {
364 consumerd64_libdir = INSTALL_LIB_PATH;
365 }
366 #else
367 #error "Unknown bitness"
368 #endif
369
370 /*
371 * runtime env. var. overrides the build default.
372 */
373 bin = lttng_secure_getenv("LTTNG_CONSUMERD32_BIN");
374 if (bin) {
375 consumerd32_bin = bin;
376 }
377 bin = lttng_secure_getenv("LTTNG_CONSUMERD64_BIN");
378 if (bin) {
379 consumerd64_bin = bin;
380 }
381 libdir = lttng_secure_getenv("LTTNG_CONSUMERD32_LIBDIR");
382 if (libdir) {
383 consumerd32_libdir = libdir;
384 }
385 libdir = lttng_secure_getenv("LTTNG_CONSUMERD64_LIBDIR");
386 if (libdir) {
387 consumerd64_libdir = libdir;
388 }
389 }
390
391 static
392 int __sessiond_set_thread_pollset(struct lttng_poll_event *events, size_t size,
393 int *a_pipe)
394 {
395 int ret;
396
397 assert(events);
398
399 ret = lttng_poll_create(events, size, LTTNG_CLOEXEC);
400 if (ret < 0) {
401 goto error;
402 }
403
404 /* Add quit pipe */
405 ret = lttng_poll_add(events, a_pipe[0], LPOLLIN | LPOLLERR);
406 if (ret < 0) {
407 goto error;
408 }
409
410 return 0;
411
412 error:
413 return ret;
414 }
415
416 /*
417 * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set.
418 */
419 int sessiond_set_thread_pollset(struct lttng_poll_event *events, size_t size)
420 {
421 return __sessiond_set_thread_pollset(events, size, thread_quit_pipe);
422 }
423
424 /*
425 * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set.
426 */
427 int sessiond_set_ht_cleanup_thread_pollset(struct lttng_poll_event *events,
428 size_t size)
429 {
430 return __sessiond_set_thread_pollset(events, size,
431 ht_cleanup_quit_pipe);
432 }
433
434 static
435 int __sessiond_check_thread_quit_pipe(int fd, uint32_t events, int a_pipe)
436 {
437 if (fd == a_pipe && (events & LPOLLIN)) {
438 return 1;
439 }
440 return 0;
441 }
442
443 /*
444 * Check if the thread quit pipe was triggered.
445 *
446 * Return 1 if it was triggered else 0;
447 */
448 int sessiond_check_thread_quit_pipe(int fd, uint32_t events)
449 {
450 return __sessiond_check_thread_quit_pipe(fd, events,
451 thread_quit_pipe[0]);
452 }
453
454 /*
455 * Check if the ht_cleanup thread quit pipe was triggered.
456 *
457 * Return 1 if it was triggered else 0;
458 */
459 int sessiond_check_ht_cleanup_quit(int fd, uint32_t events)
460 {
461 return __sessiond_check_thread_quit_pipe(fd, events,
462 ht_cleanup_quit_pipe[0]);
463 }
464
465 /*
466 * Init thread quit pipe.
467 *
468 * Return -1 on error or 0 if all pipes are created.
469 */
470 static int __init_thread_quit_pipe(int *a_pipe)
471 {
472 int ret, i;
473
474 ret = pipe(a_pipe);
475 if (ret < 0) {
476 PERROR("thread quit pipe");
477 goto error;
478 }
479
480 for (i = 0; i < 2; i++) {
481 ret = fcntl(a_pipe[i], F_SETFD, FD_CLOEXEC);
482 if (ret < 0) {
483 PERROR("fcntl");
484 goto error;
485 }
486 }
487
488 error:
489 return ret;
490 }
491
492 static int init_thread_quit_pipe(void)
493 {
494 return __init_thread_quit_pipe(thread_quit_pipe);
495 }
496
497 static int init_ht_cleanup_quit_pipe(void)
498 {
499 return __init_thread_quit_pipe(ht_cleanup_quit_pipe);
500 }
501
502 /*
503 * Stop all threads by closing the thread quit pipe.
504 */
505 static void stop_threads(void)
506 {
507 int ret;
508
509 /* Stopping all threads */
510 DBG("Terminating all threads");
511 ret = notify_thread_pipe(thread_quit_pipe[1]);
512 if (ret < 0) {
513 ERR("write error on thread quit pipe");
514 }
515
516 /* Dispatch thread */
517 CMM_STORE_SHARED(dispatch_thread_exit, 1);
518 futex_nto1_wake(&ust_cmd_queue.futex);
519 }
520
521 /*
522 * Close every consumer sockets.
523 */
524 static void close_consumer_sockets(void)
525 {
526 int ret;
527
528 if (kconsumer_data.err_sock >= 0) {
529 ret = close(kconsumer_data.err_sock);
530 if (ret < 0) {
531 PERROR("kernel consumer err_sock close");
532 }
533 }
534 if (ustconsumer32_data.err_sock >= 0) {
535 ret = close(ustconsumer32_data.err_sock);
536 if (ret < 0) {
537 PERROR("UST consumerd32 err_sock close");
538 }
539 }
540 if (ustconsumer64_data.err_sock >= 0) {
541 ret = close(ustconsumer64_data.err_sock);
542 if (ret < 0) {
543 PERROR("UST consumerd64 err_sock close");
544 }
545 }
546 if (kconsumer_data.cmd_sock >= 0) {
547 ret = close(kconsumer_data.cmd_sock);
548 if (ret < 0) {
549 PERROR("kernel consumer cmd_sock close");
550 }
551 }
552 if (ustconsumer32_data.cmd_sock >= 0) {
553 ret = close(ustconsumer32_data.cmd_sock);
554 if (ret < 0) {
555 PERROR("UST consumerd32 cmd_sock close");
556 }
557 }
558 if (ustconsumer64_data.cmd_sock >= 0) {
559 ret = close(ustconsumer64_data.cmd_sock);
560 if (ret < 0) {
561 PERROR("UST consumerd64 cmd_sock close");
562 }
563 }
564 }
565
566 /*
567 * Generate the full lock file path using the rundir.
568 *
569 * Return the snprintf() return value thus a negative value is an error.
570 */
571 static int generate_lock_file_path(char *path, size_t len)
572 {
573 int ret;
574
575 assert(path);
576 assert(rundir);
577
578 /* Build lockfile path from rundir. */
579 ret = snprintf(path, len, "%s/" DEFAULT_LTTNG_SESSIOND_LOCKFILE, rundir);
580 if (ret < 0) {
581 PERROR("snprintf lockfile path");
582 }
583
584 return ret;
585 }
586
587 /*
588 * Wait on consumer process termination.
589 *
590 * Need to be called with the consumer data lock held or from a context
591 * ensuring no concurrent access to data (e.g: cleanup).
592 */
593 static void wait_consumer(struct consumer_data *consumer_data)
594 {
595 pid_t ret;
596 int status;
597
598 if (consumer_data->pid <= 0) {
599 return;
600 }
601
602 DBG("Waiting for complete teardown of consumerd (PID: %d)",
603 consumer_data->pid);
604 ret = waitpid(consumer_data->pid, &status, 0);
605 if (ret == -1) {
606 PERROR("consumerd waitpid pid: %d", consumer_data->pid)
607 }
608 if (!WIFEXITED(status)) {
609 ERR("consumerd termination with error: %d",
610 WEXITSTATUS(ret));
611 }
612 consumer_data->pid = 0;
613 }
614
615 /*
616 * Cleanup the session daemon's data structures.
617 */
618 static void sessiond_cleanup(void)
619 {
620 int ret;
621 struct ltt_session *sess, *stmp;
622 char path[PATH_MAX];
623
624 DBG("Cleanup sessiond");
625
626 /*
627 * Close the thread quit pipe. It has already done its job,
628 * since we are now called.
629 */
630 utils_close_pipe(thread_quit_pipe);
631
632 /*
633 * If opt_pidfile is undefined, the default file will be wiped when
634 * removing the rundir.
635 */
636 if (opt_pidfile) {
637 ret = remove(opt_pidfile);
638 if (ret < 0) {
639 PERROR("remove pidfile %s", opt_pidfile);
640 }
641 }
642
643 DBG("Removing sessiond and consumerd content of directory %s", rundir);
644
645 /* sessiond */
646 snprintf(path, PATH_MAX,
647 "%s/%s",
648 rundir, DEFAULT_LTTNG_SESSIOND_PIDFILE);
649 DBG("Removing %s", path);
650 (void) unlink(path);
651
652 snprintf(path, PATH_MAX, "%s/%s", rundir,
653 DEFAULT_LTTNG_SESSIOND_AGENTPORT_FILE);
654 DBG("Removing %s", path);
655 (void) unlink(path);
656
657 /* kconsumerd */
658 snprintf(path, PATH_MAX,
659 DEFAULT_KCONSUMERD_ERR_SOCK_PATH,
660 rundir);
661 DBG("Removing %s", path);
662 (void) unlink(path);
663
664 snprintf(path, PATH_MAX,
665 DEFAULT_KCONSUMERD_PATH,
666 rundir);
667 DBG("Removing directory %s", path);
668 (void) rmdir(path);
669
670 /* ust consumerd 32 */
671 snprintf(path, PATH_MAX,
672 DEFAULT_USTCONSUMERD32_ERR_SOCK_PATH,
673 rundir);
674 DBG("Removing %s", path);
675 (void) unlink(path);
676
677 snprintf(path, PATH_MAX,
678 DEFAULT_USTCONSUMERD32_PATH,
679 rundir);
680 DBG("Removing directory %s", path);
681 (void) rmdir(path);
682
683 /* ust consumerd 64 */
684 snprintf(path, PATH_MAX,
685 DEFAULT_USTCONSUMERD64_ERR_SOCK_PATH,
686 rundir);
687 DBG("Removing %s", path);
688 (void) unlink(path);
689
690 snprintf(path, PATH_MAX,
691 DEFAULT_USTCONSUMERD64_PATH,
692 rundir);
693 DBG("Removing directory %s", path);
694 (void) rmdir(path);
695
696 DBG("Cleaning up all sessions");
697
698 /* Destroy session list mutex */
699 if (session_list_ptr != NULL) {
700 pthread_mutex_destroy(&session_list_ptr->lock);
701
702 /* Cleanup ALL session */
703 cds_list_for_each_entry_safe(sess, stmp,
704 &session_list_ptr->head, list) {
705 cmd_destroy_session(sess, kernel_poll_pipe[1]);
706 }
707 }
708
709 wait_consumer(&kconsumer_data);
710 wait_consumer(&ustconsumer64_data);
711 wait_consumer(&ustconsumer32_data);
712
713 DBG("Cleaning up all agent apps");
714 agent_app_ht_clean();
715
716 DBG("Closing all UST sockets");
717 ust_app_clean_list();
718 buffer_reg_destroy_registries();
719
720 if (is_root && !opt_no_kernel) {
721 DBG2("Closing kernel fd");
722 if (kernel_tracer_fd >= 0) {
723 ret = close(kernel_tracer_fd);
724 if (ret) {
725 PERROR("close");
726 }
727 }
728 DBG("Unloading kernel modules");
729 modprobe_remove_lttng_all();
730 free(syscall_table);
731 }
732
733 close_consumer_sockets();
734
735 if (load_info) {
736 load_session_destroy_data(load_info);
737 free(load_info);
738 }
739
740 /*
741 * Cleanup lock file by deleting it and finaly closing it which will
742 * release the file system lock.
743 */
744 if (lockfile_fd >= 0) {
745 char lockfile_path[PATH_MAX];
746
747 ret = generate_lock_file_path(lockfile_path,
748 sizeof(lockfile_path));
749 if (ret > 0) {
750 ret = remove(lockfile_path);
751 if (ret < 0) {
752 PERROR("remove lock file");
753 }
754 ret = close(lockfile_fd);
755 if (ret < 0) {
756 PERROR("close lock file");
757 }
758 }
759 }
760
761 /*
762 * We do NOT rmdir rundir because there are other processes
763 * using it, for instance lttng-relayd, which can start in
764 * parallel with this teardown.
765 */
766
767 free(rundir);
768 }
769
770 /*
771 * Cleanup the daemon's option data structures.
772 */
773 static void sessiond_cleanup_options(void)
774 {
775 DBG("Cleaning up options");
776
777 /*
778 * If the override option is set, the pointer points to a *non* const
779 * thus freeing it even though the variable type is set to const.
780 */
781 if (tracing_group_name_override) {
782 free((void *) tracing_group_name);
783 }
784 if (consumerd32_bin_override) {
785 free((void *) consumerd32_bin);
786 }
787 if (consumerd64_bin_override) {
788 free((void *) consumerd64_bin);
789 }
790 if (consumerd32_libdir_override) {
791 free((void *) consumerd32_libdir);
792 }
793 if (consumerd64_libdir_override) {
794 free((void *) consumerd64_libdir);
795 }
796
797 free(opt_pidfile);
798 free(opt_load_session_path);
799 free(kmod_probes_list);
800 free(kmod_extra_probes_list);
801
802 run_as_destroy_worker();
803
804 /* <fun> */
805 DBG("%c[%d;%dm*** assert failed :-) *** ==> %c[%dm%c[%d;%dm"
806 "Matthew, BEET driven development works!%c[%dm",
807 27, 1, 31, 27, 0, 27, 1, 33, 27, 0);
808 /* </fun> */
809 }
810
811 /*
812 * Send data on a unix socket using the liblttsessiondcomm API.
813 *
814 * Return lttcomm error code.
815 */
816 static int send_unix_sock(int sock, void *buf, size_t len)
817 {
818 /* Check valid length */
819 if (len == 0) {
820 return -1;
821 }
822
823 return lttcomm_send_unix_sock(sock, buf, len);
824 }
825
826 /*
827 * Free memory of a command context structure.
828 */
829 static void clean_command_ctx(struct command_ctx **cmd_ctx)
830 {
831 DBG("Clean command context structure");
832 if (*cmd_ctx) {
833 if ((*cmd_ctx)->llm) {
834 free((*cmd_ctx)->llm);
835 }
836 if ((*cmd_ctx)->lsm) {
837 free((*cmd_ctx)->lsm);
838 }
839 free(*cmd_ctx);
840 *cmd_ctx = NULL;
841 }
842 }
843
844 /*
845 * Notify UST applications using the shm mmap futex.
846 */
847 static int notify_ust_apps(int active)
848 {
849 char *wait_shm_mmap;
850
851 DBG("Notifying applications of session daemon state: %d", active);
852
853 /* See shm.c for this call implying mmap, shm and futex calls */
854 wait_shm_mmap = shm_ust_get_mmap(wait_shm_path, is_root);
855 if (wait_shm_mmap == NULL) {
856 goto error;
857 }
858
859 /* Wake waiting process */
860 futex_wait_update((int32_t *) wait_shm_mmap, active);
861
862 /* Apps notified successfully */
863 return 0;
864
865 error:
866 return -1;
867 }
868
869 /*
870 * Setup the outgoing data buffer for the response (llm) by allocating the
871 * right amount of memory and copying the original information from the lsm
872 * structure.
873 *
874 * Return 0 on success, negative value on error.
875 */
876 static int setup_lttng_msg(struct command_ctx *cmd_ctx,
877 const void *payload_buf, size_t payload_len,
878 const void *cmd_header_buf, size_t cmd_header_len)
879 {
880 int ret = 0;
881 const size_t header_len = sizeof(struct lttcomm_lttng_msg);
882 const size_t cmd_header_offset = header_len;
883 const size_t payload_offset = cmd_header_offset + cmd_header_len;
884 const size_t total_msg_size = header_len + cmd_header_len + payload_len;
885
886 cmd_ctx->llm = zmalloc(total_msg_size);
887
888 if (cmd_ctx->llm == NULL) {
889 PERROR("zmalloc");
890 ret = -ENOMEM;
891 goto end;
892 }
893
894 /* Copy common data */
895 cmd_ctx->llm->cmd_type = cmd_ctx->lsm->cmd_type;
896 cmd_ctx->llm->pid = cmd_ctx->lsm->domain.attr.pid;
897 cmd_ctx->llm->cmd_header_size = cmd_header_len;
898 cmd_ctx->llm->data_size = payload_len;
899 cmd_ctx->lttng_msg_size = total_msg_size;
900
901 /* Copy command header */
902 if (cmd_header_len) {
903 memcpy(((uint8_t *) cmd_ctx->llm) + cmd_header_offset, cmd_header_buf,
904 cmd_header_len);
905 }
906
907 /* Copy payload */
908 if (payload_len) {
909 memcpy(((uint8_t *) cmd_ctx->llm) + payload_offset, payload_buf,
910 payload_len);
911 }
912
913 end:
914 return ret;
915 }
916
917 /*
918 * Version of setup_lttng_msg() without command header.
919 */
920 static int setup_lttng_msg_no_cmd_header(struct command_ctx *cmd_ctx,
921 void *payload_buf, size_t payload_len)
922 {
923 return setup_lttng_msg(cmd_ctx, payload_buf, payload_len, NULL, 0);
924 }
925 /*
926 * Update the kernel poll set of all channel fd available over all tracing
927 * session. Add the wakeup pipe at the end of the set.
928 */
929 static int update_kernel_poll(struct lttng_poll_event *events)
930 {
931 int ret;
932 struct ltt_session *session;
933 struct ltt_kernel_channel *channel;
934
935 DBG("Updating kernel poll set");
936
937 session_lock_list();
938 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
939 session_lock(session);
940 if (session->kernel_session == NULL) {
941 session_unlock(session);
942 continue;
943 }
944
945 cds_list_for_each_entry(channel,
946 &session->kernel_session->channel_list.head, list) {
947 /* Add channel fd to the kernel poll set */
948 ret = lttng_poll_add(events, channel->fd, LPOLLIN | LPOLLRDNORM);
949 if (ret < 0) {
950 session_unlock(session);
951 goto error;
952 }
953 DBG("Channel fd %d added to kernel set", channel->fd);
954 }
955 session_unlock(session);
956 }
957 session_unlock_list();
958
959 return 0;
960
961 error:
962 session_unlock_list();
963 return -1;
964 }
965
966 /*
967 * Find the channel fd from 'fd' over all tracing session. When found, check
968 * for new channel stream and send those stream fds to the kernel consumer.
969 *
970 * Useful for CPU hotplug feature.
971 */
972 static int update_kernel_stream(struct consumer_data *consumer_data, int fd)
973 {
974 int ret = 0;
975 struct ltt_session *session;
976 struct ltt_kernel_session *ksess;
977 struct ltt_kernel_channel *channel;
978
979 DBG("Updating kernel streams for channel fd %d", fd);
980
981 session_lock_list();
982 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
983 session_lock(session);
984 if (session->kernel_session == NULL) {
985 session_unlock(session);
986 continue;
987 }
988 ksess = session->kernel_session;
989
990 cds_list_for_each_entry(channel,
991 &ksess->channel_list.head, list) {
992 struct lttng_ht_iter iter;
993 struct consumer_socket *socket;
994
995 if (channel->fd != fd) {
996 continue;
997 }
998 DBG("Channel found, updating kernel streams");
999 ret = kernel_open_channel_stream(channel);
1000 if (ret < 0) {
1001 goto error;
1002 }
1003 /* Update the stream global counter */
1004 ksess->stream_count_global += ret;
1005
1006 /*
1007 * Have we already sent fds to the consumer? If yes, it
1008 * means that tracing is started so it is safe to send
1009 * our updated stream fds.
1010 */
1011 if (ksess->consumer_fds_sent != 1
1012 || ksess->consumer == NULL) {
1013 ret = -1;
1014 goto error;
1015 }
1016
1017 rcu_read_lock();
1018 cds_lfht_for_each_entry(ksess->consumer->socks->ht,
1019 &iter.iter, socket, node.node) {
1020 pthread_mutex_lock(socket->lock);
1021 ret = kernel_consumer_send_channel_stream(socket,
1022 channel, ksess,
1023 session->output_traces ? 1 : 0);
1024 pthread_mutex_unlock(socket->lock);
1025 if (ret < 0) {
1026 rcu_read_unlock();
1027 goto error;
1028 }
1029 }
1030 rcu_read_unlock();
1031 }
1032 session_unlock(session);
1033 }
1034 session_unlock_list();
1035 return ret;
1036
1037 error:
1038 session_unlock(session);
1039 session_unlock_list();
1040 return ret;
1041 }
1042
1043 /*
1044 * For each tracing session, update newly registered apps. The session list
1045 * lock MUST be acquired before calling this.
1046 */
1047 static void update_ust_app(int app_sock)
1048 {
1049 struct ltt_session *sess, *stmp;
1050
1051 /* Consumer is in an ERROR state. Stop any application update. */
1052 if (uatomic_read(&ust_consumerd_state) == CONSUMER_ERROR) {
1053 /* Stop the update process since the consumer is dead. */
1054 return;
1055 }
1056
1057 /* For all tracing session(s) */
1058 cds_list_for_each_entry_safe(sess, stmp, &session_list_ptr->head, list) {
1059 struct ust_app *app;
1060
1061 session_lock(sess);
1062 if (!sess->ust_session) {
1063 goto unlock_session;
1064 }
1065
1066 rcu_read_lock();
1067 assert(app_sock >= 0);
1068 app = ust_app_find_by_sock(app_sock);
1069 if (app == NULL) {
1070 /*
1071 * Application can be unregistered before so
1072 * this is possible hence simply stopping the
1073 * update.
1074 */
1075 DBG3("UST app update failed to find app sock %d",
1076 app_sock);
1077 goto unlock_rcu;
1078 }
1079 ust_app_global_update(sess->ust_session, app);
1080 unlock_rcu:
1081 rcu_read_unlock();
1082 unlock_session:
1083 session_unlock(sess);
1084 }
1085 }
1086
1087 /*
1088 * This thread manage event coming from the kernel.
1089 *
1090 * Features supported in this thread:
1091 * -) CPU Hotplug
1092 */
1093 static void *thread_manage_kernel(void *data)
1094 {
1095 int ret, i, pollfd, update_poll_flag = 1, err = -1;
1096 uint32_t revents, nb_fd;
1097 char tmp;
1098 struct lttng_poll_event events;
1099
1100 DBG("[thread] Thread manage kernel started");
1101
1102 health_register(health_sessiond, HEALTH_SESSIOND_TYPE_KERNEL);
1103
1104 /*
1105 * This first step of the while is to clean this structure which could free
1106 * non NULL pointers so initialize it before the loop.
1107 */
1108 lttng_poll_init(&events);
1109
1110 if (testpoint(sessiond_thread_manage_kernel)) {
1111 goto error_testpoint;
1112 }
1113
1114 health_code_update();
1115
1116 if (testpoint(sessiond_thread_manage_kernel_before_loop)) {
1117 goto error_testpoint;
1118 }
1119
1120 while (1) {
1121 health_code_update();
1122
1123 if (update_poll_flag == 1) {
1124 /* Clean events object. We are about to populate it again. */
1125 lttng_poll_clean(&events);
1126
1127 ret = sessiond_set_thread_pollset(&events, 2);
1128 if (ret < 0) {
1129 goto error_poll_create;
1130 }
1131
1132 ret = lttng_poll_add(&events, kernel_poll_pipe[0], LPOLLIN);
1133 if (ret < 0) {
1134 goto error;
1135 }
1136
1137 /* This will add the available kernel channel if any. */
1138 ret = update_kernel_poll(&events);
1139 if (ret < 0) {
1140 goto error;
1141 }
1142 update_poll_flag = 0;
1143 }
1144
1145 DBG("Thread kernel polling");
1146
1147 /* Poll infinite value of time */
1148 restart:
1149 health_poll_entry();
1150 ret = lttng_poll_wait(&events, -1);
1151 DBG("Thread kernel return from poll on %d fds",
1152 LTTNG_POLL_GETNB(&events));
1153 health_poll_exit();
1154 if (ret < 0) {
1155 /*
1156 * Restart interrupted system call.
1157 */
1158 if (errno == EINTR) {
1159 goto restart;
1160 }
1161 goto error;
1162 } else if (ret == 0) {
1163 /* Should not happen since timeout is infinite */
1164 ERR("Return value of poll is 0 with an infinite timeout.\n"
1165 "This should not have happened! Continuing...");
1166 continue;
1167 }
1168
1169 nb_fd = ret;
1170
1171 for (i = 0; i < nb_fd; i++) {
1172 /* Fetch once the poll data */
1173 revents = LTTNG_POLL_GETEV(&events, i);
1174 pollfd = LTTNG_POLL_GETFD(&events, i);
1175
1176 health_code_update();
1177
1178 if (!revents) {
1179 /* No activity for this FD (poll implementation). */
1180 continue;
1181 }
1182
1183 /* Thread quit pipe has been closed. Killing thread. */
1184 ret = sessiond_check_thread_quit_pipe(pollfd, revents);
1185 if (ret) {
1186 err = 0;
1187 goto exit;
1188 }
1189
1190 /* Check for data on kernel pipe */
1191 if (revents & LPOLLIN) {
1192 if (pollfd == kernel_poll_pipe[0]) {
1193 (void) lttng_read(kernel_poll_pipe[0],
1194 &tmp, 1);
1195 /*
1196 * Ret value is useless here, if this pipe gets any actions an
1197 * update is required anyway.
1198 */
1199 update_poll_flag = 1;
1200 continue;
1201 } else {
1202 /*
1203 * New CPU detected by the kernel. Adding kernel stream to
1204 * kernel session and updating the kernel consumer
1205 */
1206 ret = update_kernel_stream(&kconsumer_data, pollfd);
1207 if (ret < 0) {
1208 continue;
1209 }
1210 break;
1211 }
1212 } else if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1213 update_poll_flag = 1;
1214 continue;
1215 } else {
1216 ERR("Unexpected poll events %u for sock %d", revents, pollfd);
1217 goto error;
1218 }
1219 }
1220 }
1221
1222 exit:
1223 error:
1224 lttng_poll_clean(&events);
1225 error_poll_create:
1226 error_testpoint:
1227 utils_close_pipe(kernel_poll_pipe);
1228 kernel_poll_pipe[0] = kernel_poll_pipe[1] = -1;
1229 if (err) {
1230 health_error();
1231 ERR("Health error occurred in %s", __func__);
1232 WARN("Kernel thread died unexpectedly. "
1233 "Kernel tracing can continue but CPU hotplug is disabled.");
1234 }
1235 health_unregister(health_sessiond);
1236 DBG("Kernel thread dying");
1237 return NULL;
1238 }
1239
1240 /*
1241 * Signal pthread condition of the consumer data that the thread.
1242 */
1243 static void signal_consumer_condition(struct consumer_data *data, int state)
1244 {
1245 pthread_mutex_lock(&data->cond_mutex);
1246
1247 /*
1248 * The state is set before signaling. It can be any value, it's the waiter
1249 * job to correctly interpret this condition variable associated to the
1250 * consumer pthread_cond.
1251 *
1252 * A value of 0 means that the corresponding thread of the consumer data
1253 * was not started. 1 indicates that the thread has started and is ready
1254 * for action. A negative value means that there was an error during the
1255 * thread bootstrap.
1256 */
1257 data->consumer_thread_is_ready = state;
1258 (void) pthread_cond_signal(&data->cond);
1259
1260 pthread_mutex_unlock(&data->cond_mutex);
1261 }
1262
1263 /*
1264 * This thread manage the consumer error sent back to the session daemon.
1265 */
1266 static void *thread_manage_consumer(void *data)
1267 {
1268 int sock = -1, i, ret, pollfd, err = -1, should_quit = 0;
1269 uint32_t revents, nb_fd;
1270 enum lttcomm_return_code code;
1271 struct lttng_poll_event events;
1272 struct consumer_data *consumer_data = data;
1273
1274 DBG("[thread] Manage consumer started");
1275
1276 rcu_register_thread();
1277 rcu_thread_online();
1278
1279 health_register(health_sessiond, HEALTH_SESSIOND_TYPE_CONSUMER);
1280
1281 health_code_update();
1282
1283 /*
1284 * Pass 3 as size here for the thread quit pipe, consumerd_err_sock and the
1285 * metadata_sock. Nothing more will be added to this poll set.
1286 */
1287 ret = sessiond_set_thread_pollset(&events, 3);
1288 if (ret < 0) {
1289 goto error_poll;
1290 }
1291
1292 /*
1293 * The error socket here is already in a listening state which was done
1294 * just before spawning this thread to avoid a race between the consumer
1295 * daemon exec trying to connect and the listen() call.
1296 */
1297 ret = lttng_poll_add(&events, consumer_data->err_sock, LPOLLIN | LPOLLRDHUP);
1298 if (ret < 0) {
1299 goto error;
1300 }
1301
1302 health_code_update();
1303
1304 /* Infinite blocking call, waiting for transmission */
1305 restart:
1306 health_poll_entry();
1307
1308 if (testpoint(sessiond_thread_manage_consumer)) {
1309 goto error;
1310 }
1311
1312 ret = lttng_poll_wait(&events, -1);
1313 health_poll_exit();
1314 if (ret < 0) {
1315 /*
1316 * Restart interrupted system call.
1317 */
1318 if (errno == EINTR) {
1319 goto restart;
1320 }
1321 goto error;
1322 }
1323
1324 nb_fd = ret;
1325
1326 for (i = 0; i < nb_fd; i++) {
1327 /* Fetch once the poll data */
1328 revents = LTTNG_POLL_GETEV(&events, i);
1329 pollfd = LTTNG_POLL_GETFD(&events, i);
1330
1331 health_code_update();
1332
1333 if (!revents) {
1334 /* No activity for this FD (poll implementation). */
1335 continue;
1336 }
1337
1338 /* Thread quit pipe has been closed. Killing thread. */
1339 ret = sessiond_check_thread_quit_pipe(pollfd, revents);
1340 if (ret) {
1341 err = 0;
1342 goto exit;
1343 }
1344
1345 /* Event on the registration socket */
1346 if (pollfd == consumer_data->err_sock) {
1347 if (revents & LPOLLIN) {
1348 continue;
1349 } else if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1350 ERR("consumer err socket poll error");
1351 goto error;
1352 } else {
1353 ERR("Unexpected poll events %u for sock %d", revents, pollfd);
1354 goto error;
1355 }
1356 }
1357 }
1358
1359 sock = lttcomm_accept_unix_sock(consumer_data->err_sock);
1360 if (sock < 0) {
1361 goto error;
1362 }
1363
1364 /*
1365 * Set the CLOEXEC flag. Return code is useless because either way, the
1366 * show must go on.
1367 */
1368 (void) utils_set_fd_cloexec(sock);
1369
1370 health_code_update();
1371
1372 DBG2("Receiving code from consumer err_sock");
1373
1374 /* Getting status code from kconsumerd */
1375 ret = lttcomm_recv_unix_sock(sock, &code,
1376 sizeof(enum lttcomm_return_code));
1377 if (ret <= 0) {
1378 goto error;
1379 }
1380
1381 health_code_update();
1382 if (code == LTTCOMM_CONSUMERD_COMMAND_SOCK_READY) {
1383 /* Connect both socket, command and metadata. */
1384 consumer_data->cmd_sock =
1385 lttcomm_connect_unix_sock(consumer_data->cmd_unix_sock_path);
1386 consumer_data->metadata_fd =
1387 lttcomm_connect_unix_sock(consumer_data->cmd_unix_sock_path);
1388 if (consumer_data->cmd_sock < 0
1389 || consumer_data->metadata_fd < 0) {
1390 PERROR("consumer connect cmd socket");
1391 /* On error, signal condition and quit. */
1392 signal_consumer_condition(consumer_data, -1);
1393 goto error;
1394 }
1395 consumer_data->metadata_sock.fd_ptr = &consumer_data->metadata_fd;
1396 /* Create metadata socket lock. */
1397 consumer_data->metadata_sock.lock = zmalloc(sizeof(pthread_mutex_t));
1398 if (consumer_data->metadata_sock.lock == NULL) {
1399 PERROR("zmalloc pthread mutex");
1400 ret = -1;
1401 goto error;
1402 }
1403 pthread_mutex_init(consumer_data->metadata_sock.lock, NULL);
1404
1405 signal_consumer_condition(consumer_data, 1);
1406 DBG("Consumer command socket ready (fd: %d", consumer_data->cmd_sock);
1407 DBG("Consumer metadata socket ready (fd: %d)",
1408 consumer_data->metadata_fd);
1409 } else {
1410 ERR("consumer error when waiting for SOCK_READY : %s",
1411 lttcomm_get_readable_code(-code));
1412 goto error;
1413 }
1414
1415 /* Remove the consumerd error sock since we've established a connexion */
1416 ret = lttng_poll_del(&events, consumer_data->err_sock);
1417 if (ret < 0) {
1418 goto error;
1419 }
1420
1421 /* Add new accepted error socket. */
1422 ret = lttng_poll_add(&events, sock, LPOLLIN | LPOLLRDHUP);
1423 if (ret < 0) {
1424 goto error;
1425 }
1426
1427 /* Add metadata socket that is successfully connected. */
1428 ret = lttng_poll_add(&events, consumer_data->metadata_fd,
1429 LPOLLIN | LPOLLRDHUP);
1430 if (ret < 0) {
1431 goto error;
1432 }
1433
1434 health_code_update();
1435
1436 /* Infinite blocking call, waiting for transmission */
1437 restart_poll:
1438 while (1) {
1439 health_code_update();
1440
1441 /* Exit the thread because the thread quit pipe has been triggered. */
1442 if (should_quit) {
1443 /* Not a health error. */
1444 err = 0;
1445 goto exit;
1446 }
1447
1448 health_poll_entry();
1449 ret = lttng_poll_wait(&events, -1);
1450 health_poll_exit();
1451 if (ret < 0) {
1452 /*
1453 * Restart interrupted system call.
1454 */
1455 if (errno == EINTR) {
1456 goto restart_poll;
1457 }
1458 goto error;
1459 }
1460
1461 nb_fd = ret;
1462
1463 for (i = 0; i < nb_fd; i++) {
1464 /* Fetch once the poll data */
1465 revents = LTTNG_POLL_GETEV(&events, i);
1466 pollfd = LTTNG_POLL_GETFD(&events, i);
1467
1468 health_code_update();
1469
1470 if (!revents) {
1471 /* No activity for this FD (poll implementation). */
1472 continue;
1473 }
1474
1475 /*
1476 * Thread quit pipe has been triggered, flag that we should stop
1477 * but continue the current loop to handle potential data from
1478 * consumer.
1479 */
1480 should_quit = sessiond_check_thread_quit_pipe(pollfd, revents);
1481
1482 if (pollfd == sock) {
1483 /* Event on the consumerd socket */
1484 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)
1485 && !(revents & LPOLLIN)) {
1486 ERR("consumer err socket second poll error");
1487 goto error;
1488 }
1489 health_code_update();
1490 /* Wait for any kconsumerd error */
1491 ret = lttcomm_recv_unix_sock(sock, &code,
1492 sizeof(enum lttcomm_return_code));
1493 if (ret <= 0) {
1494 ERR("consumer closed the command socket");
1495 goto error;
1496 }
1497
1498 ERR("consumer return code : %s",
1499 lttcomm_get_readable_code(-code));
1500
1501 goto exit;
1502 } else if (pollfd == consumer_data->metadata_fd) {
1503 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)
1504 && !(revents & LPOLLIN)) {
1505 ERR("consumer err metadata socket second poll error");
1506 goto error;
1507 }
1508 /* UST metadata requests */
1509 ret = ust_consumer_metadata_request(
1510 &consumer_data->metadata_sock);
1511 if (ret < 0) {
1512 ERR("Handling metadata request");
1513 goto error;
1514 }
1515 }
1516 /* No need for an else branch all FDs are tested prior. */
1517 }
1518 health_code_update();
1519 }
1520
1521 exit:
1522 error:
1523 /*
1524 * We lock here because we are about to close the sockets and some other
1525 * thread might be using them so get exclusive access which will abort all
1526 * other consumer command by other threads.
1527 */
1528 pthread_mutex_lock(&consumer_data->lock);
1529
1530 /* Immediately set the consumerd state to stopped */
1531 if (consumer_data->type == LTTNG_CONSUMER_KERNEL) {
1532 uatomic_set(&kernel_consumerd_state, CONSUMER_ERROR);
1533 } else if (consumer_data->type == LTTNG_CONSUMER64_UST ||
1534 consumer_data->type == LTTNG_CONSUMER32_UST) {
1535 uatomic_set(&ust_consumerd_state, CONSUMER_ERROR);
1536 } else {
1537 /* Code flow error... */
1538 assert(0);
1539 }
1540
1541 if (consumer_data->err_sock >= 0) {
1542 ret = close(consumer_data->err_sock);
1543 if (ret) {
1544 PERROR("close");
1545 }
1546 consumer_data->err_sock = -1;
1547 }
1548 if (consumer_data->cmd_sock >= 0) {
1549 ret = close(consumer_data->cmd_sock);
1550 if (ret) {
1551 PERROR("close");
1552 }
1553 consumer_data->cmd_sock = -1;
1554 }
1555 if (consumer_data->metadata_sock.fd_ptr &&
1556 *consumer_data->metadata_sock.fd_ptr >= 0) {
1557 ret = close(*consumer_data->metadata_sock.fd_ptr);
1558 if (ret) {
1559 PERROR("close");
1560 }
1561 }
1562 if (sock >= 0) {
1563 ret = close(sock);
1564 if (ret) {
1565 PERROR("close");
1566 }
1567 }
1568
1569 unlink(consumer_data->err_unix_sock_path);
1570 unlink(consumer_data->cmd_unix_sock_path);
1571 pthread_mutex_unlock(&consumer_data->lock);
1572
1573 /* Cleanup metadata socket mutex. */
1574 if (consumer_data->metadata_sock.lock) {
1575 pthread_mutex_destroy(consumer_data->metadata_sock.lock);
1576 free(consumer_data->metadata_sock.lock);
1577 }
1578 lttng_poll_clean(&events);
1579 error_poll:
1580 if (err) {
1581 health_error();
1582 ERR("Health error occurred in %s", __func__);
1583 }
1584 health_unregister(health_sessiond);
1585 DBG("consumer thread cleanup completed");
1586
1587 rcu_thread_offline();
1588 rcu_unregister_thread();
1589
1590 return NULL;
1591 }
1592
1593 /*
1594 * This thread manage application communication.
1595 */
1596 static void *thread_manage_apps(void *data)
1597 {
1598 int i, ret, pollfd, err = -1;
1599 ssize_t size_ret;
1600 uint32_t revents, nb_fd;
1601 struct lttng_poll_event events;
1602
1603 DBG("[thread] Manage application started");
1604
1605 rcu_register_thread();
1606 rcu_thread_online();
1607
1608 health_register(health_sessiond, HEALTH_SESSIOND_TYPE_APP_MANAGE);
1609
1610 if (testpoint(sessiond_thread_manage_apps)) {
1611 goto error_testpoint;
1612 }
1613
1614 health_code_update();
1615
1616 ret = sessiond_set_thread_pollset(&events, 2);
1617 if (ret < 0) {
1618 goto error_poll_create;
1619 }
1620
1621 ret = lttng_poll_add(&events, apps_cmd_pipe[0], LPOLLIN | LPOLLRDHUP);
1622 if (ret < 0) {
1623 goto error;
1624 }
1625
1626 if (testpoint(sessiond_thread_manage_apps_before_loop)) {
1627 goto error;
1628 }
1629
1630 health_code_update();
1631
1632 while (1) {
1633 DBG("Apps thread polling");
1634
1635 /* Inifinite blocking call, waiting for transmission */
1636 restart:
1637 health_poll_entry();
1638 ret = lttng_poll_wait(&events, -1);
1639 DBG("Apps thread return from poll on %d fds",
1640 LTTNG_POLL_GETNB(&events));
1641 health_poll_exit();
1642 if (ret < 0) {
1643 /*
1644 * Restart interrupted system call.
1645 */
1646 if (errno == EINTR) {
1647 goto restart;
1648 }
1649 goto error;
1650 }
1651
1652 nb_fd = ret;
1653
1654 for (i = 0; i < nb_fd; i++) {
1655 /* Fetch once the poll data */
1656 revents = LTTNG_POLL_GETEV(&events, i);
1657 pollfd = LTTNG_POLL_GETFD(&events, i);
1658
1659 health_code_update();
1660
1661 if (!revents) {
1662 /* No activity for this FD (poll implementation). */
1663 continue;
1664 }
1665
1666 /* Thread quit pipe has been closed. Killing thread. */
1667 ret = sessiond_check_thread_quit_pipe(pollfd, revents);
1668 if (ret) {
1669 err = 0;
1670 goto exit;
1671 }
1672
1673 /* Inspect the apps cmd pipe */
1674 if (pollfd == apps_cmd_pipe[0]) {
1675 if (revents & LPOLLIN) {
1676 int sock;
1677
1678 /* Empty pipe */
1679 size_ret = lttng_read(apps_cmd_pipe[0], &sock, sizeof(sock));
1680 if (size_ret < sizeof(sock)) {
1681 PERROR("read apps cmd pipe");
1682 goto error;
1683 }
1684
1685 health_code_update();
1686
1687 /*
1688 * Since this is a command socket (write then read),
1689 * we only monitor the error events of the socket.
1690 */
1691 ret = lttng_poll_add(&events, sock,
1692 LPOLLERR | LPOLLHUP | LPOLLRDHUP);
1693 if (ret < 0) {
1694 goto error;
1695 }
1696
1697 DBG("Apps with sock %d added to poll set", sock);
1698 } else if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1699 ERR("Apps command pipe error");
1700 goto error;
1701 } else {
1702 ERR("Unknown poll events %u for sock %d", revents, pollfd);
1703 goto error;
1704 }
1705 } else {
1706 /*
1707 * At this point, we know that a registered application made
1708 * the event at poll_wait.
1709 */
1710 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1711 /* Removing from the poll set */
1712 ret = lttng_poll_del(&events, pollfd);
1713 if (ret < 0) {
1714 goto error;
1715 }
1716
1717 /* Socket closed on remote end. */
1718 ust_app_unregister(pollfd);
1719 } else {
1720 ERR("Unexpected poll events %u for sock %d", revents, pollfd);
1721 goto error;
1722 }
1723 }
1724
1725 health_code_update();
1726 }
1727 }
1728
1729 exit:
1730 error:
1731 lttng_poll_clean(&events);
1732 error_poll_create:
1733 error_testpoint:
1734 utils_close_pipe(apps_cmd_pipe);
1735 apps_cmd_pipe[0] = apps_cmd_pipe[1] = -1;
1736
1737 /*
1738 * We don't clean the UST app hash table here since already registered
1739 * applications can still be controlled so let them be until the session
1740 * daemon dies or the applications stop.
1741 */
1742
1743 if (err) {
1744 health_error();
1745 ERR("Health error occurred in %s", __func__);
1746 }
1747 health_unregister(health_sessiond);
1748 DBG("Application communication apps thread cleanup complete");
1749 rcu_thread_offline();
1750 rcu_unregister_thread();
1751 return NULL;
1752 }
1753
1754 /*
1755 * Send a socket to a thread This is called from the dispatch UST registration
1756 * thread once all sockets are set for the application.
1757 *
1758 * The sock value can be invalid, we don't really care, the thread will handle
1759 * it and make the necessary cleanup if so.
1760 *
1761 * On success, return 0 else a negative value being the errno message of the
1762 * write().
1763 */
1764 static int send_socket_to_thread(int fd, int sock)
1765 {
1766 ssize_t ret;
1767
1768 /*
1769 * It's possible that the FD is set as invalid with -1 concurrently just
1770 * before calling this function being a shutdown state of the thread.
1771 */
1772 if (fd < 0) {
1773 ret = -EBADF;
1774 goto error;
1775 }
1776
1777 ret = lttng_write(fd, &sock, sizeof(sock));
1778 if (ret < sizeof(sock)) {
1779 PERROR("write apps pipe %d", fd);
1780 if (ret < 0) {
1781 ret = -errno;
1782 }
1783 goto error;
1784 }
1785
1786 /* All good. Don't send back the write positive ret value. */
1787 ret = 0;
1788 error:
1789 return (int) ret;
1790 }
1791
1792 /*
1793 * Sanitize the wait queue of the dispatch registration thread meaning removing
1794 * invalid nodes from it. This is to avoid memory leaks for the case the UST
1795 * notify socket is never received.
1796 */
1797 static void sanitize_wait_queue(struct ust_reg_wait_queue *wait_queue)
1798 {
1799 int ret, nb_fd = 0, i;
1800 unsigned int fd_added = 0;
1801 struct lttng_poll_event events;
1802 struct ust_reg_wait_node *wait_node = NULL, *tmp_wait_node;
1803
1804 assert(wait_queue);
1805
1806 lttng_poll_init(&events);
1807
1808 /* Just skip everything for an empty queue. */
1809 if (!wait_queue->count) {
1810 goto end;
1811 }
1812
1813 ret = lttng_poll_create(&events, wait_queue->count, LTTNG_CLOEXEC);
1814 if (ret < 0) {
1815 goto error_create;
1816 }
1817
1818 cds_list_for_each_entry_safe(wait_node, tmp_wait_node,
1819 &wait_queue->head, head) {
1820 assert(wait_node->app);
1821 ret = lttng_poll_add(&events, wait_node->app->sock,
1822 LPOLLHUP | LPOLLERR);
1823 if (ret < 0) {
1824 goto error;
1825 }
1826
1827 fd_added = 1;
1828 }
1829
1830 if (!fd_added) {
1831 goto end;
1832 }
1833
1834 /*
1835 * Poll but don't block so we can quickly identify the faulty events and
1836 * clean them afterwards from the wait queue.
1837 */
1838 ret = lttng_poll_wait(&events, 0);
1839 if (ret < 0) {
1840 goto error;
1841 }
1842 nb_fd = ret;
1843
1844 for (i = 0; i < nb_fd; i++) {
1845 /* Get faulty FD. */
1846 uint32_t revents = LTTNG_POLL_GETEV(&events, i);
1847 int pollfd = LTTNG_POLL_GETFD(&events, i);
1848
1849 if (!revents) {
1850 /* No activity for this FD (poll implementation). */
1851 continue;
1852 }
1853
1854 cds_list_for_each_entry_safe(wait_node, tmp_wait_node,
1855 &wait_queue->head, head) {
1856 if (pollfd == wait_node->app->sock &&
1857 (revents & (LPOLLHUP | LPOLLERR))) {
1858 cds_list_del(&wait_node->head);
1859 wait_queue->count--;
1860 ust_app_destroy(wait_node->app);
1861 free(wait_node);
1862 /*
1863 * Silence warning of use-after-free in
1864 * cds_list_for_each_entry_safe which uses
1865 * __typeof__(*wait_node).
1866 */
1867 wait_node = NULL;
1868 break;
1869 } else {
1870 ERR("Unexpected poll events %u for sock %d", revents, pollfd);
1871 goto error;
1872 }
1873 }
1874 }
1875
1876 if (nb_fd > 0) {
1877 DBG("Wait queue sanitized, %d node were cleaned up", nb_fd);
1878 }
1879
1880 end:
1881 lttng_poll_clean(&events);
1882 return;
1883
1884 error:
1885 lttng_poll_clean(&events);
1886 error_create:
1887 ERR("Unable to sanitize wait queue");
1888 return;
1889 }
1890
1891 /*
1892 * Dispatch request from the registration threads to the application
1893 * communication thread.
1894 */
1895 static void *thread_dispatch_ust_registration(void *data)
1896 {
1897 int ret, err = -1;
1898 struct cds_wfcq_node *node;
1899 struct ust_command *ust_cmd = NULL;
1900 struct ust_reg_wait_node *wait_node = NULL, *tmp_wait_node;
1901 struct ust_reg_wait_queue wait_queue = {
1902 .count = 0,
1903 };
1904
1905 health_register(health_sessiond, HEALTH_SESSIOND_TYPE_APP_REG_DISPATCH);
1906
1907 if (testpoint(sessiond_thread_app_reg_dispatch)) {
1908 goto error_testpoint;
1909 }
1910
1911 health_code_update();
1912
1913 CDS_INIT_LIST_HEAD(&wait_queue.head);
1914
1915 DBG("[thread] Dispatch UST command started");
1916
1917 while (!CMM_LOAD_SHARED(dispatch_thread_exit)) {
1918 health_code_update();
1919
1920 /* Atomically prepare the queue futex */
1921 futex_nto1_prepare(&ust_cmd_queue.futex);
1922
1923 do {
1924 struct ust_app *app = NULL;
1925 ust_cmd = NULL;
1926
1927 /*
1928 * Make sure we don't have node(s) that have hung up before receiving
1929 * the notify socket. This is to clean the list in order to avoid
1930 * memory leaks from notify socket that are never seen.
1931 */
1932 sanitize_wait_queue(&wait_queue);
1933
1934 health_code_update();
1935 /* Dequeue command for registration */
1936 node = cds_wfcq_dequeue_blocking(&ust_cmd_queue.head, &ust_cmd_queue.tail);
1937 if (node == NULL) {
1938 DBG("Woken up but nothing in the UST command queue");
1939 /* Continue thread execution */
1940 break;
1941 }
1942
1943 ust_cmd = caa_container_of(node, struct ust_command, node);
1944
1945 DBG("Dispatching UST registration pid:%d ppid:%d uid:%d"
1946 " gid:%d sock:%d name:%s (version %d.%d)",
1947 ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid,
1948 ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid,
1949 ust_cmd->sock, ust_cmd->reg_msg.name,
1950 ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor);
1951
1952 if (ust_cmd->reg_msg.type == USTCTL_SOCKET_CMD) {
1953 wait_node = zmalloc(sizeof(*wait_node));
1954 if (!wait_node) {
1955 PERROR("zmalloc wait_node dispatch");
1956 ret = close(ust_cmd->sock);
1957 if (ret < 0) {
1958 PERROR("close ust sock dispatch %d", ust_cmd->sock);
1959 }
1960 lttng_fd_put(LTTNG_FD_APPS, 1);
1961 free(ust_cmd);
1962 goto error;
1963 }
1964 CDS_INIT_LIST_HEAD(&wait_node->head);
1965
1966 /* Create application object if socket is CMD. */
1967 wait_node->app = ust_app_create(&ust_cmd->reg_msg,
1968 ust_cmd->sock);
1969 if (!wait_node->app) {
1970 ret = close(ust_cmd->sock);
1971 if (ret < 0) {
1972 PERROR("close ust sock dispatch %d", ust_cmd->sock);
1973 }
1974 lttng_fd_put(LTTNG_FD_APPS, 1);
1975 free(wait_node);
1976 free(ust_cmd);
1977 continue;
1978 }
1979 /*
1980 * Add application to the wait queue so we can set the notify
1981 * socket before putting this object in the global ht.
1982 */
1983 cds_list_add(&wait_node->head, &wait_queue.head);
1984 wait_queue.count++;
1985
1986 free(ust_cmd);
1987 /*
1988 * We have to continue here since we don't have the notify
1989 * socket and the application MUST be added to the hash table
1990 * only at that moment.
1991 */
1992 continue;
1993 } else {
1994 /*
1995 * Look for the application in the local wait queue and set the
1996 * notify socket if found.
1997 */
1998 cds_list_for_each_entry_safe(wait_node, tmp_wait_node,
1999 &wait_queue.head, head) {
2000 health_code_update();
2001 if (wait_node->app->pid == ust_cmd->reg_msg.pid) {
2002 wait_node->app->notify_sock = ust_cmd->sock;
2003 cds_list_del(&wait_node->head);
2004 wait_queue.count--;
2005 app = wait_node->app;
2006 free(wait_node);
2007 DBG3("UST app notify socket %d is set", ust_cmd->sock);
2008 break;
2009 }
2010 }
2011
2012 /*
2013 * With no application at this stage the received socket is
2014 * basically useless so close it before we free the cmd data
2015 * structure for good.
2016 */
2017 if (!app) {
2018 ret = close(ust_cmd->sock);
2019 if (ret < 0) {
2020 PERROR("close ust sock dispatch %d", ust_cmd->sock);
2021 }
2022 lttng_fd_put(LTTNG_FD_APPS, 1);
2023 }
2024 free(ust_cmd);
2025 }
2026
2027 if (app) {
2028 /*
2029 * @session_lock_list
2030 *
2031 * Lock the global session list so from the register up to the
2032 * registration done message, no thread can see the application
2033 * and change its state.
2034 */
2035 session_lock_list();
2036 rcu_read_lock();
2037
2038 /*
2039 * Add application to the global hash table. This needs to be
2040 * done before the update to the UST registry can locate the
2041 * application.
2042 */
2043 ust_app_add(app);
2044
2045 /* Set app version. This call will print an error if needed. */
2046 (void) ust_app_version(app);
2047
2048 /* Send notify socket through the notify pipe. */
2049 ret = send_socket_to_thread(apps_cmd_notify_pipe[1],
2050 app->notify_sock);
2051 if (ret < 0) {
2052 rcu_read_unlock();
2053 session_unlock_list();
2054 /*
2055 * No notify thread, stop the UST tracing. However, this is
2056 * not an internal error of the this thread thus setting
2057 * the health error code to a normal exit.
2058 */
2059 err = 0;
2060 goto error;
2061 }
2062
2063 /*
2064 * Update newly registered application with the tracing
2065 * registry info already enabled information.
2066 */
2067 update_ust_app(app->sock);
2068
2069 /*
2070 * Don't care about return value. Let the manage apps threads
2071 * handle app unregistration upon socket close.
2072 */
2073 (void) ust_app_register_done(app);
2074
2075 /*
2076 * Even if the application socket has been closed, send the app
2077 * to the thread and unregistration will take place at that
2078 * place.
2079 */
2080 ret = send_socket_to_thread(apps_cmd_pipe[1], app->sock);
2081 if (ret < 0) {
2082 rcu_read_unlock();
2083 session_unlock_list();
2084 /*
2085 * No apps. thread, stop the UST tracing. However, this is
2086 * not an internal error of the this thread thus setting
2087 * the health error code to a normal exit.
2088 */
2089 err = 0;
2090 goto error;
2091 }
2092
2093 rcu_read_unlock();
2094 session_unlock_list();
2095 }
2096 } while (node != NULL);
2097
2098 health_poll_entry();
2099 /* Futex wait on queue. Blocking call on futex() */
2100 futex_nto1_wait(&ust_cmd_queue.futex);
2101 health_poll_exit();
2102 }
2103 /* Normal exit, no error */
2104 err = 0;
2105
2106 error:
2107 /* Clean up wait queue. */
2108 cds_list_for_each_entry_safe(wait_node, tmp_wait_node,
2109 &wait_queue.head, head) {
2110 cds_list_del(&wait_node->head);
2111 wait_queue.count--;
2112 free(wait_node);
2113 }
2114
2115 /* Empty command queue. */
2116 for (;;) {
2117 /* Dequeue command for registration */
2118 node = cds_wfcq_dequeue_blocking(&ust_cmd_queue.head, &ust_cmd_queue.tail);
2119 if (node == NULL) {
2120 break;
2121 }
2122 ust_cmd = caa_container_of(node, struct ust_command, node);
2123 ret = close(ust_cmd->sock);
2124 if (ret < 0) {
2125 PERROR("close ust sock exit dispatch %d", ust_cmd->sock);
2126 }
2127 lttng_fd_put(LTTNG_FD_APPS, 1);
2128 free(ust_cmd);
2129 }
2130
2131 error_testpoint:
2132 DBG("Dispatch thread dying");
2133 if (err) {
2134 health_error();
2135 ERR("Health error occurred in %s", __func__);
2136 }
2137 health_unregister(health_sessiond);
2138 return NULL;
2139 }
2140
2141 /*
2142 * This thread manage application registration.
2143 */
2144 static void *thread_registration_apps(void *data)
2145 {
2146 int sock = -1, i, ret, pollfd, err = -1;
2147 uint32_t revents, nb_fd;
2148 struct lttng_poll_event events;
2149 /*
2150 * Get allocated in this thread, enqueued to a global queue, dequeued and
2151 * freed in the manage apps thread.
2152 */
2153 struct ust_command *ust_cmd = NULL;
2154
2155 DBG("[thread] Manage application registration started");
2156
2157 health_register(health_sessiond, HEALTH_SESSIOND_TYPE_APP_REG);
2158
2159 if (testpoint(sessiond_thread_registration_apps)) {
2160 goto error_testpoint;
2161 }
2162
2163 ret = lttcomm_listen_unix_sock(apps_sock);
2164 if (ret < 0) {
2165 goto error_listen;
2166 }
2167
2168 /*
2169 * Pass 2 as size here for the thread quit pipe and apps socket. Nothing
2170 * more will be added to this poll set.
2171 */
2172 ret = sessiond_set_thread_pollset(&events, 2);
2173 if (ret < 0) {
2174 goto error_create_poll;
2175 }
2176
2177 /* Add the application registration socket */
2178 ret = lttng_poll_add(&events, apps_sock, LPOLLIN | LPOLLRDHUP);
2179 if (ret < 0) {
2180 goto error_poll_add;
2181 }
2182
2183 /* Notify all applications to register */
2184 ret = notify_ust_apps(1);
2185 if (ret < 0) {
2186 ERR("Failed to notify applications or create the wait shared memory.\n"
2187 "Execution continues but there might be problem for already\n"
2188 "running applications that wishes to register.");
2189 }
2190
2191 while (1) {
2192 DBG("Accepting application registration");
2193
2194 /* Inifinite blocking call, waiting for transmission */
2195 restart:
2196 health_poll_entry();
2197 ret = lttng_poll_wait(&events, -1);
2198 health_poll_exit();
2199 if (ret < 0) {
2200 /*
2201 * Restart interrupted system call.
2202 */
2203 if (errno == EINTR) {
2204 goto restart;
2205 }
2206 goto error;
2207 }
2208
2209 nb_fd = ret;
2210
2211 for (i = 0; i < nb_fd; i++) {
2212 health_code_update();
2213
2214 /* Fetch once the poll data */
2215 revents = LTTNG_POLL_GETEV(&events, i);
2216 pollfd = LTTNG_POLL_GETFD(&events, i);
2217
2218 if (!revents) {
2219 /* No activity for this FD (poll implementation). */
2220 continue;
2221 }
2222
2223 /* Thread quit pipe has been closed. Killing thread. */
2224 ret = sessiond_check_thread_quit_pipe(pollfd, revents);
2225 if (ret) {
2226 err = 0;
2227 goto exit;
2228 }
2229
2230 /* Event on the registration socket */
2231 if (pollfd == apps_sock) {
2232 if (revents & LPOLLIN) {
2233 sock = lttcomm_accept_unix_sock(apps_sock);
2234 if (sock < 0) {
2235 goto error;
2236 }
2237
2238 /*
2239 * Set socket timeout for both receiving and ending.
2240 * app_socket_timeout is in seconds, whereas
2241 * lttcomm_setsockopt_rcv_timeout and
2242 * lttcomm_setsockopt_snd_timeout expect msec as
2243 * parameter.
2244 */
2245 (void) lttcomm_setsockopt_rcv_timeout(sock,
2246 app_socket_timeout * 1000);
2247 (void) lttcomm_setsockopt_snd_timeout(sock,
2248 app_socket_timeout * 1000);
2249
2250 /*
2251 * Set the CLOEXEC flag. Return code is useless because
2252 * either way, the show must go on.
2253 */
2254 (void) utils_set_fd_cloexec(sock);
2255
2256 /* Create UST registration command for enqueuing */
2257 ust_cmd = zmalloc(sizeof(struct ust_command));
2258 if (ust_cmd == NULL) {
2259 PERROR("ust command zmalloc");
2260 ret = close(sock);
2261 if (ret) {
2262 PERROR("close");
2263 }
2264 goto error;
2265 }
2266
2267 /*
2268 * Using message-based transmissions to ensure we don't
2269 * have to deal with partially received messages.
2270 */
2271 ret = lttng_fd_get(LTTNG_FD_APPS, 1);
2272 if (ret < 0) {
2273 ERR("Exhausted file descriptors allowed for applications.");
2274 free(ust_cmd);
2275 ret = close(sock);
2276 if (ret) {
2277 PERROR("close");
2278 }
2279 sock = -1;
2280 continue;
2281 }
2282
2283 health_code_update();
2284 ret = ust_app_recv_registration(sock, &ust_cmd->reg_msg);
2285 if (ret < 0) {
2286 free(ust_cmd);
2287 /* Close socket of the application. */
2288 ret = close(sock);
2289 if (ret) {
2290 PERROR("close");
2291 }
2292 lttng_fd_put(LTTNG_FD_APPS, 1);
2293 sock = -1;
2294 continue;
2295 }
2296 health_code_update();
2297
2298 ust_cmd->sock = sock;
2299 sock = -1;
2300
2301 DBG("UST registration received with pid:%d ppid:%d uid:%d"
2302 " gid:%d sock:%d name:%s (version %d.%d)",
2303 ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid,
2304 ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid,
2305 ust_cmd->sock, ust_cmd->reg_msg.name,
2306 ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor);
2307
2308 /*
2309 * Lock free enqueue the registration request. The red pill
2310 * has been taken! This apps will be part of the *system*.
2311 */
2312 cds_wfcq_enqueue(&ust_cmd_queue.head, &ust_cmd_queue.tail, &ust_cmd->node);
2313
2314 /*
2315 * Wake the registration queue futex. Implicit memory
2316 * barrier with the exchange in cds_wfcq_enqueue.
2317 */
2318 futex_nto1_wake(&ust_cmd_queue.futex);
2319 } else if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
2320 ERR("Register apps socket poll error");
2321 goto error;
2322 } else {
2323 ERR("Unexpected poll events %u for sock %d", revents, pollfd);
2324 goto error;
2325 }
2326 }
2327 }
2328 }
2329
2330 exit:
2331 error:
2332 /* Notify that the registration thread is gone */
2333 notify_ust_apps(0);
2334
2335 if (apps_sock >= 0) {
2336 ret = close(apps_sock);
2337 if (ret) {
2338 PERROR("close");
2339 }
2340 }
2341 if (sock >= 0) {
2342 ret = close(sock);
2343 if (ret) {
2344 PERROR("close");
2345 }
2346 lttng_fd_put(LTTNG_FD_APPS, 1);
2347 }
2348 unlink(apps_unix_sock_path);
2349
2350 error_poll_add:
2351 lttng_poll_clean(&events);
2352 error_listen:
2353 error_create_poll:
2354 error_testpoint:
2355 DBG("UST Registration thread cleanup complete");
2356 if (err) {
2357 health_error();
2358 ERR("Health error occurred in %s", __func__);
2359 }
2360 health_unregister(health_sessiond);
2361
2362 return NULL;
2363 }
2364
2365 /*
2366 * Start the thread_manage_consumer. This must be done after a lttng-consumerd
2367 * exec or it will fails.
2368 */
2369 static int spawn_consumer_thread(struct consumer_data *consumer_data)
2370 {
2371 int ret, clock_ret;
2372 struct timespec timeout;
2373
2374 /* Make sure we set the readiness flag to 0 because we are NOT ready */
2375 consumer_data->consumer_thread_is_ready = 0;
2376
2377 /* Setup pthread condition */
2378 ret = pthread_condattr_init(&consumer_data->condattr);
2379 if (ret) {
2380 errno = ret;
2381 PERROR("pthread_condattr_init consumer data");
2382 goto error;
2383 }
2384
2385 /*
2386 * Set the monotonic clock in order to make sure we DO NOT jump in time
2387 * between the clock_gettime() call and the timedwait call. See bug #324
2388 * for a more details and how we noticed it.
2389 */
2390 ret = pthread_condattr_setclock(&consumer_data->condattr, CLOCK_MONOTONIC);
2391 if (ret) {
2392 errno = ret;
2393 PERROR("pthread_condattr_setclock consumer data");
2394 goto error;
2395 }
2396
2397 ret = pthread_cond_init(&consumer_data->cond, &consumer_data->condattr);
2398 if (ret) {
2399 errno = ret;
2400 PERROR("pthread_cond_init consumer data");
2401 goto error;
2402 }
2403
2404 ret = pthread_create(&consumer_data->thread, NULL, thread_manage_consumer,
2405 consumer_data);
2406 if (ret) {
2407 errno = ret;
2408 PERROR("pthread_create consumer");
2409 ret = -1;
2410 goto error;
2411 }
2412
2413 /* We are about to wait on a pthread condition */
2414 pthread_mutex_lock(&consumer_data->cond_mutex);
2415
2416 /* Get time for sem_timedwait absolute timeout */
2417 clock_ret = clock_gettime(CLOCK_MONOTONIC, &timeout);
2418 /*
2419 * Set the timeout for the condition timed wait even if the clock gettime
2420 * call fails since we might loop on that call and we want to avoid to
2421 * increment the timeout too many times.
2422 */
2423 timeout.tv_sec += DEFAULT_SEM_WAIT_TIMEOUT;
2424
2425 /*
2426 * The following loop COULD be skipped in some conditions so this is why we
2427 * set ret to 0 in order to make sure at least one round of the loop is
2428 * done.
2429 */
2430 ret = 0;
2431
2432 /*
2433 * Loop until the condition is reached or when a timeout is reached. Note
2434 * that the pthread_cond_timedwait(P) man page specifies that EINTR can NOT
2435 * be returned but the pthread_cond(3), from the glibc-doc, says that it is
2436 * possible. This loop does not take any chances and works with both of
2437 * them.
2438 */
2439 while (!consumer_data->consumer_thread_is_ready && ret != ETIMEDOUT) {
2440 if (clock_ret < 0) {
2441 PERROR("clock_gettime spawn consumer");
2442 /* Infinite wait for the consumerd thread to be ready */
2443 ret = pthread_cond_wait(&consumer_data->cond,
2444 &consumer_data->cond_mutex);
2445 } else {
2446 ret = pthread_cond_timedwait(&consumer_data->cond,
2447 &consumer_data->cond_mutex, &timeout);
2448 }
2449 }
2450
2451 /* Release the pthread condition */
2452 pthread_mutex_unlock(&consumer_data->cond_mutex);
2453
2454 if (ret != 0) {
2455 errno = ret;
2456 if (ret == ETIMEDOUT) {
2457 int pth_ret;
2458
2459 /*
2460 * Call has timed out so we kill the kconsumerd_thread and return
2461 * an error.
2462 */
2463 ERR("Condition timed out. The consumer thread was never ready."
2464 " Killing it");
2465 pth_ret = pthread_cancel(consumer_data->thread);
2466 if (pth_ret < 0) {
2467 PERROR("pthread_cancel consumer thread");
2468 }
2469 } else {
2470 PERROR("pthread_cond_wait failed consumer thread");
2471 }
2472 /* Caller is expecting a negative value on failure. */
2473 ret = -1;
2474 goto error;
2475 }
2476
2477 pthread_mutex_lock(&consumer_data->pid_mutex);
2478 if (consumer_data->pid == 0) {
2479 ERR("Consumerd did not start");
2480 pthread_mutex_unlock(&consumer_data->pid_mutex);
2481 goto error;
2482 }
2483 pthread_mutex_unlock(&consumer_data->pid_mutex);
2484
2485 return 0;
2486
2487 error:
2488 return ret;
2489 }
2490
2491 /*
2492 * Join consumer thread
2493 */
2494 static int join_consumer_thread(struct consumer_data *consumer_data)
2495 {
2496 void *status;
2497
2498 /* Consumer pid must be a real one. */
2499 if (consumer_data->pid > 0) {
2500 int ret;
2501 ret = kill(consumer_data->pid, SIGTERM);
2502 if (ret) {
2503 PERROR("Error killing consumer daemon");
2504 return ret;
2505 }
2506 return pthread_join(consumer_data->thread, &status);
2507 } else {
2508 return 0;
2509 }
2510 }
2511
2512 /*
2513 * Fork and exec a consumer daemon (consumerd).
2514 *
2515 * Return pid if successful else -1.
2516 */
2517 static pid_t spawn_consumerd(struct consumer_data *consumer_data)
2518 {
2519 int ret;
2520 pid_t pid;
2521 const char *consumer_to_use;
2522 const char *verbosity;
2523 struct stat st;
2524
2525 DBG("Spawning consumerd");
2526
2527 pid = fork();
2528 if (pid == 0) {
2529 /*
2530 * Exec consumerd.
2531 */
2532 if (opt_verbose_consumer) {
2533 verbosity = "--verbose";
2534 } else if (lttng_opt_quiet) {
2535 verbosity = "--quiet";
2536 } else {
2537 verbosity = "";
2538 }
2539
2540 switch (consumer_data->type) {
2541 case LTTNG_CONSUMER_KERNEL:
2542 /*
2543 * Find out which consumerd to execute. We will first try the
2544 * 64-bit path, then the sessiond's installation directory, and
2545 * fallback on the 32-bit one,
2546 */
2547 DBG3("Looking for a kernel consumer at these locations:");
2548 DBG3(" 1) %s", consumerd64_bin);
2549 DBG3(" 2) %s/%s", INSTALL_BIN_PATH, CONSUMERD_FILE);
2550 DBG3(" 3) %s", consumerd32_bin);
2551 if (stat(consumerd64_bin, &st) == 0) {
2552 DBG3("Found location #1");
2553 consumer_to_use = consumerd64_bin;
2554 } else if (stat(INSTALL_BIN_PATH "/" CONSUMERD_FILE, &st) == 0) {
2555 DBG3("Found location #2");
2556 consumer_to_use = INSTALL_BIN_PATH "/" CONSUMERD_FILE;
2557 } else if (stat(consumerd32_bin, &st) == 0) {
2558 DBG3("Found location #3");
2559 consumer_to_use = consumerd32_bin;
2560 } else {
2561 DBG("Could not find any valid consumerd executable");
2562 ret = -EINVAL;
2563 break;
2564 }
2565 DBG("Using kernel consumer at: %s", consumer_to_use);
2566 ret = execl(consumer_to_use,
2567 "lttng-consumerd", verbosity, "-k",
2568 "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
2569 "--consumerd-err-sock", consumer_data->err_unix_sock_path,
2570 "--group", tracing_group_name,
2571 NULL);
2572 break;
2573 case LTTNG_CONSUMER64_UST:
2574 {
2575 char *tmpnew = NULL;
2576
2577 if (consumerd64_libdir[0] != '\0') {
2578 char *tmp;
2579 size_t tmplen;
2580
2581 tmp = lttng_secure_getenv("LD_LIBRARY_PATH");
2582 if (!tmp) {
2583 tmp = "";
2584 }
2585 tmplen = strlen("LD_LIBRARY_PATH=")
2586 + strlen(consumerd64_libdir) + 1 /* : */ + strlen(tmp);
2587 tmpnew = zmalloc(tmplen + 1 /* \0 */);
2588 if (!tmpnew) {
2589 ret = -ENOMEM;
2590 goto error;
2591 }
2592 strcpy(tmpnew, "LD_LIBRARY_PATH=");
2593 strcat(tmpnew, consumerd64_libdir);
2594 if (tmp[0] != '\0') {
2595 strcat(tmpnew, ":");
2596 strcat(tmpnew, tmp);
2597 }
2598 ret = putenv(tmpnew);
2599 if (ret) {
2600 ret = -errno;
2601 free(tmpnew);
2602 goto error;
2603 }
2604 }
2605 DBG("Using 64-bit UST consumer at: %s", consumerd64_bin);
2606 ret = execl(consumerd64_bin, "lttng-consumerd", verbosity, "-u",
2607 "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
2608 "--consumerd-err-sock", consumer_data->err_unix_sock_path,
2609 "--group", tracing_group_name,
2610 NULL);
2611 if (consumerd64_libdir[0] != '\0') {
2612 free(tmpnew);
2613 }
2614 break;
2615 }
2616 case LTTNG_CONSUMER32_UST:
2617 {
2618 char *tmpnew = NULL;
2619
2620 if (consumerd32_libdir[0] != '\0') {
2621 char *tmp;
2622 size_t tmplen;
2623
2624 tmp = lttng_secure_getenv("LD_LIBRARY_PATH");
2625 if (!tmp) {
2626 tmp = "";
2627 }
2628 tmplen = strlen("LD_LIBRARY_PATH=")
2629 + strlen(consumerd32_libdir) + 1 /* : */ + strlen(tmp);
2630 tmpnew = zmalloc(tmplen + 1 /* \0 */);
2631 if (!tmpnew) {
2632 ret = -ENOMEM;
2633 goto error;
2634 }
2635 strcpy(tmpnew, "LD_LIBRARY_PATH=");
2636 strcat(tmpnew, consumerd32_libdir);
2637 if (tmp[0] != '\0') {
2638 strcat(tmpnew, ":");
2639 strcat(tmpnew, tmp);
2640 }
2641 ret = putenv(tmpnew);
2642 if (ret) {
2643 ret = -errno;
2644 free(tmpnew);
2645 goto error;
2646 }
2647 }
2648 DBG("Using 32-bit UST consumer at: %s", consumerd32_bin);
2649 ret = execl(consumerd32_bin, "lttng-consumerd", verbosity, "-u",
2650 "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
2651 "--consumerd-err-sock", consumer_data->err_unix_sock_path,
2652 "--group", tracing_group_name,
2653 NULL);
2654 if (consumerd32_libdir[0] != '\0') {
2655 free(tmpnew);
2656 }
2657 break;
2658 }
2659 default:
2660 PERROR("unknown consumer type");
2661 exit(EXIT_FAILURE);
2662 }
2663 if (errno != 0) {
2664 PERROR("Consumer execl()");
2665 }
2666 /* Reaching this point, we got a failure on our execl(). */
2667 exit(EXIT_FAILURE);
2668 } else if (pid > 0) {
2669 ret = pid;
2670 } else {
2671 PERROR("start consumer fork");
2672 ret = -errno;
2673 }
2674 error:
2675 return ret;
2676 }
2677
2678 /*
2679 * Spawn the consumerd daemon and session daemon thread.
2680 */
2681 static int start_consumerd(struct consumer_data *consumer_data)
2682 {
2683 int ret;
2684
2685 /*
2686 * Set the listen() state on the socket since there is a possible race
2687 * between the exec() of the consumer daemon and this call if place in the
2688 * consumer thread. See bug #366 for more details.
2689 */
2690 ret = lttcomm_listen_unix_sock(consumer_data->err_sock);
2691 if (ret < 0) {
2692 goto error;
2693 }
2694
2695 pthread_mutex_lock(&consumer_data->pid_mutex);
2696 if (consumer_data->pid != 0) {
2697 pthread_mutex_unlock(&consumer_data->pid_mutex);
2698 goto end;
2699 }
2700
2701 ret = spawn_consumerd(consumer_data);
2702 if (ret < 0) {
2703 ERR("Spawning consumerd failed");
2704 pthread_mutex_unlock(&consumer_data->pid_mutex);
2705 goto error;
2706 }
2707
2708 /* Setting up the consumer_data pid */
2709 consumer_data->pid = ret;
2710 DBG2("Consumer pid %d", consumer_data->pid);
2711 pthread_mutex_unlock(&consumer_data->pid_mutex);
2712
2713 DBG2("Spawning consumer control thread");
2714 ret = spawn_consumer_thread(consumer_data);
2715 if (ret < 0) {
2716 ERR("Fatal error spawning consumer control thread");
2717 goto error;
2718 }
2719
2720 end:
2721 return 0;
2722
2723 error:
2724 /* Cleanup already created sockets on error. */
2725 if (consumer_data->err_sock >= 0) {
2726 int err;
2727
2728 err = close(consumer_data->err_sock);
2729 if (err < 0) {
2730 PERROR("close consumer data error socket");
2731 }
2732 }
2733 return ret;
2734 }
2735
2736 /*
2737 * Setup necessary data for kernel tracer action.
2738 */
2739 static int init_kernel_tracer(void)
2740 {
2741 int ret;
2742
2743 /* Modprobe lttng kernel modules */
2744 ret = modprobe_lttng_control();
2745 if (ret < 0) {
2746 goto error;
2747 }
2748
2749 /* Open debugfs lttng */
2750 kernel_tracer_fd = open(module_proc_lttng, O_RDWR);
2751 if (kernel_tracer_fd < 0) {
2752 DBG("Failed to open %s", module_proc_lttng);
2753 ret = -1;
2754 goto error_open;
2755 }
2756
2757 /* Validate kernel version */
2758 ret = kernel_validate_version(kernel_tracer_fd);
2759 if (ret < 0) {
2760 goto error_version;
2761 }
2762
2763 ret = modprobe_lttng_data();
2764 if (ret < 0) {
2765 goto error_modules;
2766 }
2767
2768 DBG("Kernel tracer fd %d", kernel_tracer_fd);
2769 return 0;
2770
2771 error_version:
2772 modprobe_remove_lttng_control();
2773 ret = close(kernel_tracer_fd);
2774 if (ret) {
2775 PERROR("close");
2776 }
2777 kernel_tracer_fd = -1;
2778 return LTTNG_ERR_KERN_VERSION;
2779
2780 error_modules:
2781 ret = close(kernel_tracer_fd);
2782 if (ret) {
2783 PERROR("close");
2784 }
2785
2786 error_open:
2787 modprobe_remove_lttng_control();
2788
2789 error:
2790 WARN("No kernel tracer available");
2791 kernel_tracer_fd = -1;
2792 if (!is_root) {
2793 return LTTNG_ERR_NEED_ROOT_SESSIOND;
2794 } else {
2795 return LTTNG_ERR_KERN_NA;
2796 }
2797 }
2798
2799
2800 /*
2801 * Copy consumer output from the tracing session to the domain session. The
2802 * function also applies the right modification on a per domain basis for the
2803 * trace files destination directory.
2804 *
2805 * Should *NOT* be called with RCU read-side lock held.
2806 */
2807 static int copy_session_consumer(int domain, struct ltt_session *session)
2808 {
2809 int ret;
2810 const char *dir_name;
2811 struct consumer_output *consumer;
2812
2813 assert(session);
2814 assert(session->consumer);
2815
2816 switch (domain) {
2817 case LTTNG_DOMAIN_KERNEL:
2818 DBG3("Copying tracing session consumer output in kernel session");
2819 /*
2820 * XXX: We should audit the session creation and what this function
2821 * does "extra" in order to avoid a destroy since this function is used
2822 * in the domain session creation (kernel and ust) only. Same for UST
2823 * domain.
2824 */
2825 if (session->kernel_session->consumer) {
2826 consumer_output_put(session->kernel_session->consumer);
2827 }
2828 session->kernel_session->consumer =
2829 consumer_copy_output(session->consumer);
2830 /* Ease our life a bit for the next part */
2831 consumer = session->kernel_session->consumer;
2832 dir_name = DEFAULT_KERNEL_TRACE_DIR;
2833 break;
2834 case LTTNG_DOMAIN_JUL:
2835 case LTTNG_DOMAIN_LOG4J:
2836 case LTTNG_DOMAIN_PYTHON:
2837 case LTTNG_DOMAIN_UST:
2838 DBG3("Copying tracing session consumer output in UST session");
2839 if (session->ust_session->consumer) {
2840 consumer_output_put(session->ust_session->consumer);
2841 }
2842 session->ust_session->consumer =
2843 consumer_copy_output(session->consumer);
2844 /* Ease our life a bit for the next part */
2845 consumer = session->ust_session->consumer;
2846 dir_name = DEFAULT_UST_TRACE_DIR;
2847 break;
2848 default:
2849 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
2850 goto error;
2851 }
2852
2853 /* Append correct directory to subdir */
2854 strncat(consumer->subdir, dir_name,
2855 sizeof(consumer->subdir) - strlen(consumer->subdir) - 1);
2856 DBG3("Copy session consumer subdir %s", consumer->subdir);
2857
2858 ret = LTTNG_OK;
2859
2860 error:
2861 return ret;
2862 }
2863
2864 /*
2865 * Create an UST session and add it to the session ust list.
2866 *
2867 * Should *NOT* be called with RCU read-side lock held.
2868 */
2869 static int create_ust_session(struct ltt_session *session,
2870 struct lttng_domain *domain)
2871 {
2872 int ret;
2873 struct ltt_ust_session *lus = NULL;
2874
2875 assert(session);
2876 assert(domain);
2877 assert(session->consumer);
2878
2879 switch (domain->type) {
2880 case LTTNG_DOMAIN_JUL:
2881 case LTTNG_DOMAIN_LOG4J:
2882 case LTTNG_DOMAIN_PYTHON:
2883 case LTTNG_DOMAIN_UST:
2884 break;
2885 default:
2886 ERR("Unknown UST domain on create session %d", domain->type);
2887 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
2888 goto error;
2889 }
2890
2891 DBG("Creating UST session");
2892
2893 lus = trace_ust_create_session(session->id);
2894 if (lus == NULL) {
2895 ret = LTTNG_ERR_UST_SESS_FAIL;
2896 goto error;
2897 }
2898
2899 lus->uid = session->uid;
2900 lus->gid = session->gid;
2901 lus->output_traces = session->output_traces;
2902 lus->snapshot_mode = session->snapshot_mode;
2903 lus->live_timer_interval = session->live_timer;
2904 session->ust_session = lus;
2905 if (session->shm_path[0]) {
2906 strncpy(lus->root_shm_path, session->shm_path,
2907 sizeof(lus->root_shm_path));
2908 lus->root_shm_path[sizeof(lus->root_shm_path) - 1] = '\0';
2909 strncpy(lus->shm_path, session->shm_path,
2910 sizeof(lus->shm_path));
2911 lus->shm_path[sizeof(lus->shm_path) - 1] = '\0';
2912 strncat(lus->shm_path, "/ust",
2913 sizeof(lus->shm_path) - strlen(lus->shm_path) - 1);
2914 }
2915 /* Copy session output to the newly created UST session */
2916 ret = copy_session_consumer(domain->type, session);
2917 if (ret != LTTNG_OK) {
2918 goto error;
2919 }
2920
2921 return LTTNG_OK;
2922
2923 error:
2924 free(lus);
2925 session->ust_session = NULL;
2926 return ret;
2927 }
2928
2929 /*
2930 * Create a kernel tracer session then create the default channel.
2931 */
2932 static int create_kernel_session(struct ltt_session *session)
2933 {
2934 int ret;
2935
2936 DBG("Creating kernel session");
2937
2938 ret = kernel_create_session(session, kernel_tracer_fd);
2939 if (ret < 0) {
2940 ret = LTTNG_ERR_KERN_SESS_FAIL;
2941 goto error;
2942 }
2943
2944 /* Code flow safety */
2945 assert(session->kernel_session);
2946
2947 /* Copy session output to the newly created Kernel session */
2948 ret = copy_session_consumer(LTTNG_DOMAIN_KERNEL, session);
2949 if (ret != LTTNG_OK) {
2950 goto error;
2951 }
2952
2953 /* Create directory(ies) on local filesystem. */
2954 if (session->kernel_session->consumer->type == CONSUMER_DST_LOCAL &&
2955 strlen(session->kernel_session->consumer->dst.trace_path) > 0) {
2956 ret = run_as_mkdir_recursive(
2957 session->kernel_session->consumer->dst.trace_path,
2958 S_IRWXU | S_IRWXG, session->uid, session->gid);
2959 if (ret < 0) {
2960 if (errno != EEXIST) {
2961 ERR("Trace directory creation error");
2962 goto error;
2963 }
2964 }
2965 }
2966
2967 session->kernel_session->uid = session->uid;
2968 session->kernel_session->gid = session->gid;
2969 session->kernel_session->output_traces = session->output_traces;
2970 session->kernel_session->snapshot_mode = session->snapshot_mode;
2971
2972 return LTTNG_OK;
2973
2974 error:
2975 trace_kernel_destroy_session(session->kernel_session);
2976 session->kernel_session = NULL;
2977 return ret;
2978 }
2979
2980 /*
2981 * Count number of session permitted by uid/gid.
2982 */
2983 static unsigned int lttng_sessions_count(uid_t uid, gid_t gid)
2984 {
2985 unsigned int i = 0;
2986 struct ltt_session *session;
2987
2988 DBG("Counting number of available session for UID %d GID %d",
2989 uid, gid);
2990 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
2991 /*
2992 * Only list the sessions the user can control.
2993 */
2994 if (!session_access_ok(session, uid, gid)) {
2995 continue;
2996 }
2997 i++;
2998 }
2999 return i;
3000 }
3001
3002 /*
3003 * Process the command requested by the lttng client within the command
3004 * context structure. This function make sure that the return structure (llm)
3005 * is set and ready for transmission before returning.
3006 *
3007 * Return any error encountered or 0 for success.
3008 *
3009 * "sock" is only used for special-case var. len data.
3010 *
3011 * Should *NOT* be called with RCU read-side lock held.
3012 */
3013 static int process_client_msg(struct command_ctx *cmd_ctx, int sock,
3014 int *sock_error)
3015 {
3016 int ret = LTTNG_OK;
3017 int need_tracing_session = 1;
3018 int need_domain;
3019
3020 DBG("Processing client command %d", cmd_ctx->lsm->cmd_type);
3021
3022 assert(!rcu_read_ongoing());
3023
3024 *sock_error = 0;
3025
3026 switch (cmd_ctx->lsm->cmd_type) {
3027 case LTTNG_CREATE_SESSION:
3028 case LTTNG_CREATE_SESSION_SNAPSHOT:
3029 case LTTNG_CREATE_SESSION_LIVE:
3030 case LTTNG_DESTROY_SESSION:
3031 case LTTNG_LIST_SESSIONS:
3032 case LTTNG_LIST_DOMAINS:
3033 case LTTNG_START_TRACE:
3034 case LTTNG_STOP_TRACE:
3035 case LTTNG_DATA_PENDING:
3036 case LTTNG_SNAPSHOT_ADD_OUTPUT:
3037 case LTTNG_SNAPSHOT_DEL_OUTPUT:
3038 case LTTNG_SNAPSHOT_LIST_OUTPUT:
3039 case LTTNG_SNAPSHOT_RECORD:
3040 case LTTNG_SAVE_SESSION:
3041 case LTTNG_SET_SESSION_SHM_PATH:
3042 case LTTNG_METADATA_REGENERATE:
3043 need_domain = 0;
3044 break;
3045 default:
3046 need_domain = 1;
3047 }
3048
3049 if (opt_no_kernel && need_domain
3050 && cmd_ctx->lsm->domain.type == LTTNG_DOMAIN_KERNEL) {
3051 if (!is_root) {
3052 ret = LTTNG_ERR_NEED_ROOT_SESSIOND;
3053 } else {
3054 ret = LTTNG_ERR_KERN_NA;
3055 }
3056 goto error;
3057 }
3058
3059 /* Deny register consumer if we already have a spawned consumer. */
3060 if (cmd_ctx->lsm->cmd_type == LTTNG_REGISTER_CONSUMER) {
3061 pthread_mutex_lock(&kconsumer_data.pid_mutex);
3062 if (kconsumer_data.pid > 0) {
3063 ret = LTTNG_ERR_KERN_CONSUMER_FAIL;
3064 pthread_mutex_unlock(&kconsumer_data.pid_mutex);
3065 goto error;
3066 }
3067 pthread_mutex_unlock(&kconsumer_data.pid_mutex);
3068 }
3069
3070 /*
3071 * Check for command that don't needs to allocate a returned payload. We do
3072 * this here so we don't have to make the call for no payload at each
3073 * command.
3074 */
3075 switch(cmd_ctx->lsm->cmd_type) {
3076 case LTTNG_LIST_SESSIONS:
3077 case LTTNG_LIST_TRACEPOINTS:
3078 case LTTNG_LIST_TRACEPOINT_FIELDS:
3079 case LTTNG_LIST_DOMAINS:
3080 case LTTNG_LIST_CHANNELS:
3081 case LTTNG_LIST_EVENTS:
3082 case LTTNG_LIST_SYSCALLS:
3083 case LTTNG_LIST_TRACKER_PIDS:
3084 break;
3085 default:
3086 /* Setup lttng message with no payload */
3087 ret = setup_lttng_msg_no_cmd_header(cmd_ctx, NULL, 0);
3088 if (ret < 0) {
3089 /* This label does not try to unlock the session */
3090 goto init_setup_error;
3091 }
3092 }
3093
3094 /* Commands that DO NOT need a session. */
3095 switch (cmd_ctx->lsm->cmd_type) {
3096 case LTTNG_CREATE_SESSION:
3097 case LTTNG_CREATE_SESSION_SNAPSHOT:
3098 case LTTNG_CREATE_SESSION_LIVE:
3099 case LTTNG_CALIBRATE:
3100 case LTTNG_LIST_SESSIONS:
3101 case LTTNG_LIST_TRACEPOINTS:
3102 case LTTNG_LIST_SYSCALLS:
3103 case LTTNG_LIST_TRACEPOINT_FIELDS:
3104 case LTTNG_SAVE_SESSION:
3105 need_tracing_session = 0;
3106 break;
3107 default:
3108 DBG("Getting session %s by name", cmd_ctx->lsm->session.name);
3109 /*
3110 * We keep the session list lock across _all_ commands
3111 * for now, because the per-session lock does not
3112 * handle teardown properly.
3113 */
3114 session_lock_list();
3115 cmd_ctx->session = session_find_by_name(cmd_ctx->lsm->session.name);
3116 if (cmd_ctx->session == NULL) {
3117 ret = LTTNG_ERR_SESS_NOT_FOUND;
3118 goto error;
3119 } else {
3120 /* Acquire lock for the session */
3121 session_lock(cmd_ctx->session);
3122 }
3123 break;
3124 }
3125
3126 /*
3127 * Commands that need a valid session but should NOT create one if none
3128 * exists. Instead of creating one and destroying it when the command is
3129 * handled, process that right before so we save some round trip in useless
3130 * code path.
3131 */
3132 switch (cmd_ctx->lsm->cmd_type) {
3133 case LTTNG_DISABLE_CHANNEL:
3134 case LTTNG_DISABLE_EVENT:
3135 switch (cmd_ctx->lsm->domain.type) {
3136 case LTTNG_DOMAIN_KERNEL:
3137 if (!cmd_ctx->session->kernel_session) {
3138 ret = LTTNG_ERR_NO_CHANNEL;
3139 goto error;
3140 }
3141 break;
3142 case LTTNG_DOMAIN_JUL:
3143 case LTTNG_DOMAIN_LOG4J:
3144 case LTTNG_DOMAIN_PYTHON:
3145 case LTTNG_DOMAIN_UST:
3146 if (!cmd_ctx->session->ust_session) {
3147 ret = LTTNG_ERR_NO_CHANNEL;
3148 goto error;
3149 }
3150 break;
3151 default:
3152 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
3153 goto error;
3154 }
3155 default:
3156 break;
3157 }
3158
3159 if (!need_domain) {
3160 goto skip_domain;
3161 }
3162
3163 /*
3164 * Check domain type for specific "pre-action".
3165 */
3166 switch (cmd_ctx->lsm->domain.type) {
3167 case LTTNG_DOMAIN_KERNEL:
3168 if (!is_root) {
3169 ret = LTTNG_ERR_NEED_ROOT_SESSIOND;
3170 goto error;
3171 }
3172
3173 /* Kernel tracer check */
3174 if (kernel_tracer_fd == -1) {
3175 /* Basically, load kernel tracer modules */
3176 ret = init_kernel_tracer();
3177 if (ret != 0) {
3178 goto error;
3179 }
3180 }
3181
3182 /* Consumer is in an ERROR state. Report back to client */
3183 if (uatomic_read(&kernel_consumerd_state) == CONSUMER_ERROR) {
3184 ret = LTTNG_ERR_NO_KERNCONSUMERD;
3185 goto error;
3186 }
3187
3188 /* Need a session for kernel command */
3189 if (need_tracing_session) {
3190 if (cmd_ctx->session->kernel_session == NULL) {
3191 ret = create_kernel_session(cmd_ctx->session);
3192 if (ret < 0) {
3193 ret = LTTNG_ERR_KERN_SESS_FAIL;
3194 goto error;
3195 }
3196 }
3197
3198 /* Start the kernel consumer daemon */
3199 pthread_mutex_lock(&kconsumer_data.pid_mutex);
3200 if (kconsumer_data.pid == 0 &&
3201 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
3202 pthread_mutex_unlock(&kconsumer_data.pid_mutex);
3203 ret = start_consumerd(&kconsumer_data);
3204 if (ret < 0) {
3205 ret = LTTNG_ERR_KERN_CONSUMER_FAIL;
3206 goto error;
3207 }
3208 uatomic_set(&kernel_consumerd_state, CONSUMER_STARTED);
3209 } else {
3210 pthread_mutex_unlock(&kconsumer_data.pid_mutex);
3211 }
3212
3213 /*
3214 * The consumer was just spawned so we need to add the socket to
3215 * the consumer output of the session if exist.
3216 */
3217 ret = consumer_create_socket(&kconsumer_data,
3218 cmd_ctx->session->kernel_session->consumer);
3219 if (ret < 0) {
3220 goto error;
3221 }
3222 }
3223
3224 break;
3225 case LTTNG_DOMAIN_JUL:
3226 case LTTNG_DOMAIN_LOG4J:
3227 case LTTNG_DOMAIN_PYTHON:
3228 case LTTNG_DOMAIN_UST:
3229 {
3230 if (!ust_app_supported()) {
3231 ret = LTTNG_ERR_NO_UST;
3232 goto error;
3233 }
3234 /* Consumer is in an ERROR state. Report back to client */
3235 if (uatomic_read(&ust_consumerd_state) == CONSUMER_ERROR) {
3236 ret = LTTNG_ERR_NO_USTCONSUMERD;
3237 goto error;
3238 }
3239
3240 if (need_tracing_session) {
3241 /* Create UST session if none exist. */
3242 if (cmd_ctx->session->ust_session == NULL) {
3243 ret = create_ust_session(cmd_ctx->session,
3244 &cmd_ctx->lsm->domain);
3245 if (ret != LTTNG_OK) {
3246 goto error;
3247 }
3248 }
3249
3250 /* Start the UST consumer daemons */
3251 /* 64-bit */
3252 pthread_mutex_lock(&ustconsumer64_data.pid_mutex);
3253 if (consumerd64_bin[0] != '\0' &&
3254 ustconsumer64_data.pid == 0 &&
3255 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
3256 pthread_mutex_unlock(&ustconsumer64_data.pid_mutex);
3257 ret = start_consumerd(&ustconsumer64_data);
3258 if (ret < 0) {
3259 ret = LTTNG_ERR_UST_CONSUMER64_FAIL;
3260 uatomic_set(&ust_consumerd64_fd, -EINVAL);
3261 goto error;
3262 }
3263
3264 uatomic_set(&ust_consumerd64_fd, ustconsumer64_data.cmd_sock);
3265 uatomic_set(&ust_consumerd_state, CONSUMER_STARTED);
3266 } else {
3267 pthread_mutex_unlock(&ustconsumer64_data.pid_mutex);
3268 }
3269
3270 /*
3271 * Setup socket for consumer 64 bit. No need for atomic access
3272 * since it was set above and can ONLY be set in this thread.
3273 */
3274 ret = consumer_create_socket(&ustconsumer64_data,
3275 cmd_ctx->session->ust_session->consumer);
3276 if (ret < 0) {
3277 goto error;
3278 }
3279
3280 /* 32-bit */
3281 pthread_mutex_lock(&ustconsumer32_data.pid_mutex);
3282 if (consumerd32_bin[0] != '\0' &&
3283 ustconsumer32_data.pid == 0 &&
3284 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
3285 pthread_mutex_unlock(&ustconsumer32_data.pid_mutex);
3286 ret = start_consumerd(&ustconsumer32_data);
3287 if (ret < 0) {
3288 ret = LTTNG_ERR_UST_CONSUMER32_FAIL;
3289 uatomic_set(&ust_consumerd32_fd, -EINVAL);
3290 goto error;
3291 }
3292
3293 uatomic_set(&ust_consumerd32_fd, ustconsumer32_data.cmd_sock);
3294 uatomic_set(&ust_consumerd_state, CONSUMER_STARTED);
3295 } else {
3296 pthread_mutex_unlock(&ustconsumer32_data.pid_mutex);
3297 }
3298
3299 /*
3300 * Setup socket for consumer 64 bit. No need for atomic access
3301 * since it was set above and can ONLY be set in this thread.
3302 */
3303 ret = consumer_create_socket(&ustconsumer32_data,
3304 cmd_ctx->session->ust_session->consumer);
3305 if (ret < 0) {
3306 goto error;
3307 }
3308 }
3309 break;
3310 }
3311 default:
3312 break;
3313 }
3314 skip_domain:
3315
3316 /* Validate consumer daemon state when start/stop trace command */
3317 if (cmd_ctx->lsm->cmd_type == LTTNG_START_TRACE ||
3318 cmd_ctx->lsm->cmd_type == LTTNG_STOP_TRACE) {
3319 switch (cmd_ctx->lsm->domain.type) {
3320 case LTTNG_DOMAIN_NONE:
3321 break;
3322 case LTTNG_DOMAIN_JUL:
3323 case LTTNG_DOMAIN_LOG4J:
3324 case LTTNG_DOMAIN_PYTHON:
3325 case LTTNG_DOMAIN_UST:
3326 if (uatomic_read(&ust_consumerd_state) != CONSUMER_STARTED) {
3327 ret = LTTNG_ERR_NO_USTCONSUMERD;
3328 goto error;
3329 }
3330 break;
3331 case LTTNG_DOMAIN_KERNEL:
3332 if (uatomic_read(&kernel_consumerd_state) != CONSUMER_STARTED) {
3333 ret = LTTNG_ERR_NO_KERNCONSUMERD;
3334 goto error;
3335 }
3336 break;
3337 default:
3338 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
3339 goto error;
3340 }
3341 }
3342
3343 /*
3344 * Check that the UID or GID match that of the tracing session.
3345 * The root user can interact with all sessions.
3346 */
3347 if (need_tracing_session) {
3348 if (!session_access_ok(cmd_ctx->session,
3349 LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds),
3350 LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds))) {
3351 ret = LTTNG_ERR_EPERM;
3352 goto error;
3353 }
3354 }
3355
3356 /*
3357 * Send relayd information to consumer as soon as we have a domain and a
3358 * session defined.
3359 */
3360 if (cmd_ctx->session && need_domain) {
3361 /*
3362 * Setup relayd if not done yet. If the relayd information was already
3363 * sent to the consumer, this call will gracefully return.
3364 */
3365 ret = cmd_setup_relayd(cmd_ctx->session);
3366 if (ret != LTTNG_OK) {
3367 goto error;
3368 }
3369 }
3370
3371 /* Process by command type */
3372 switch (cmd_ctx->lsm->cmd_type) {
3373 case LTTNG_ADD_CONTEXT:
3374 {
3375 /*
3376 * An LTTNG_ADD_CONTEXT command might have a supplementary
3377 * payload if the context being added is an application context.
3378 */
3379 if (cmd_ctx->lsm->u.context.ctx.ctx ==
3380 LTTNG_EVENT_CONTEXT_APP_CONTEXT) {
3381 char *provider_name = NULL, *context_name = NULL;
3382 size_t provider_name_len =
3383 cmd_ctx->lsm->u.context.provider_name_len;
3384 size_t context_name_len =
3385 cmd_ctx->lsm->u.context.context_name_len;
3386
3387 if (provider_name_len == 0 || context_name_len == 0) {
3388 /*
3389 * Application provider and context names MUST
3390 * be provided.
3391 */
3392 ret = -LTTNG_ERR_INVALID;
3393 goto error;
3394 }
3395
3396 provider_name = zmalloc(provider_name_len + 1);
3397 if (!provider_name) {
3398 ret = -LTTNG_ERR_NOMEM;
3399 goto error;
3400 }
3401 cmd_ctx->lsm->u.context.ctx.u.app_ctx.provider_name =
3402 provider_name;
3403
3404 context_name = zmalloc(context_name_len + 1);
3405 if (!context_name) {
3406 ret = -LTTNG_ERR_NOMEM;
3407 goto error_add_context;
3408 }
3409 cmd_ctx->lsm->u.context.ctx.u.app_ctx.ctx_name =
3410 context_name;
3411
3412 ret = lttcomm_recv_unix_sock(sock, provider_name,
3413 provider_name_len);
3414 if (ret < 0) {
3415 goto error_add_context;
3416 }
3417
3418 ret = lttcomm_recv_unix_sock(sock, context_name,
3419 context_name_len);
3420 if (ret < 0) {
3421 goto error_add_context;
3422 }
3423 }
3424
3425 /*
3426 * cmd_add_context assumes ownership of the provider and context
3427 * names.
3428 */
3429 ret = cmd_add_context(cmd_ctx->session,
3430 cmd_ctx->lsm->domain.type,
3431 cmd_ctx->lsm->u.context.channel_name,
3432 &cmd_ctx->lsm->u.context.ctx,
3433 kernel_poll_pipe[1]);
3434
3435 cmd_ctx->lsm->u.context.ctx.u.app_ctx.provider_name = NULL;
3436 cmd_ctx->lsm->u.context.ctx.u.app_ctx.ctx_name = NULL;
3437 error_add_context:
3438 free(cmd_ctx->lsm->u.context.ctx.u.app_ctx.provider_name);
3439 free(cmd_ctx->lsm->u.context.ctx.u.app_ctx.ctx_name);
3440 if (ret < 0) {
3441 goto error;
3442 }
3443 break;
3444 }
3445 case LTTNG_DISABLE_CHANNEL:
3446 {
3447 ret = cmd_disable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3448 cmd_ctx->lsm->u.disable.channel_name);
3449 break;
3450 }
3451 case LTTNG_DISABLE_EVENT:
3452 {
3453
3454 /*
3455 * FIXME: handle filter; for now we just receive the filter's
3456 * bytecode along with the filter expression which are sent by
3457 * liblttng-ctl and discard them.
3458 *
3459 * This fixes an issue where the client may block while sending
3460 * the filter payload and encounter an error because the session
3461 * daemon closes the socket without ever handling this data.
3462 */
3463 size_t count = cmd_ctx->lsm->u.disable.expression_len +
3464 cmd_ctx->lsm->u.disable.bytecode_len;
3465
3466 if (count) {
3467 char data[LTTNG_FILTER_MAX_LEN];
3468
3469 DBG("Discarding disable event command payload of size %zu", count);
3470 while (count) {
3471 ret = lttcomm_recv_unix_sock(sock, data,
3472 count > sizeof(data) ? sizeof(data) : count);
3473 if (ret < 0) {
3474 goto error;
3475 }
3476
3477 count -= (size_t) ret;
3478 }
3479 }
3480 /* FIXME: passing packed structure to non-packed pointer */
3481 ret = cmd_disable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3482 cmd_ctx->lsm->u.disable.channel_name,
3483 &cmd_ctx->lsm->u.disable.event);
3484 break;
3485 }
3486 case LTTNG_ENABLE_CHANNEL:
3487 {
3488 ret = cmd_enable_channel(cmd_ctx->session, &cmd_ctx->lsm->domain,
3489 &cmd_ctx->lsm->u.channel.chan, kernel_poll_pipe[1]);
3490 break;
3491 }
3492 case LTTNG_TRACK_PID:
3493 {
3494 ret = cmd_track_pid(cmd_ctx->session,
3495 cmd_ctx->lsm->domain.type,
3496 cmd_ctx->lsm->u.pid_tracker.pid);
3497 break;
3498 }
3499 case LTTNG_UNTRACK_PID:
3500 {
3501 ret = cmd_untrack_pid(cmd_ctx->session,
3502 cmd_ctx->lsm->domain.type,
3503 cmd_ctx->lsm->u.pid_tracker.pid);
3504 break;
3505 }
3506 case LTTNG_ENABLE_EVENT:
3507 {
3508 struct lttng_event_exclusion *exclusion = NULL;
3509 struct lttng_filter_bytecode *bytecode = NULL;
3510 char *filter_expression = NULL;
3511
3512 /* Handle exclusion events and receive it from the client. */
3513 if (cmd_ctx->lsm->u.enable.exclusion_count > 0) {
3514 size_t count = cmd_ctx->lsm->u.enable.exclusion_count;
3515
3516 exclusion = zmalloc(sizeof(struct lttng_event_exclusion) +
3517 (count * LTTNG_SYMBOL_NAME_LEN));
3518 if (!exclusion) {
3519 ret = LTTNG_ERR_EXCLUSION_NOMEM;
3520 goto error;
3521 }
3522
3523 DBG("Receiving var len exclusion event list from client ...");
3524 exclusion->count = count;
3525 ret = lttcomm_recv_unix_sock(sock, exclusion->names,
3526 count * LTTNG_SYMBOL_NAME_LEN);
3527 if (ret <= 0) {
3528 DBG("Nothing recv() from client var len data... continuing");
3529 *sock_error = 1;
3530 free(exclusion);
3531 ret = LTTNG_ERR_EXCLUSION_INVAL;
3532 goto error;
3533 }
3534 }
3535
3536 /* Get filter expression from client. */
3537 if (cmd_ctx->lsm->u.enable.expression_len > 0) {
3538 size_t expression_len =
3539 cmd_ctx->lsm->u.enable.expression_len;
3540
3541 if (expression_len > LTTNG_FILTER_MAX_LEN) {
3542 ret = LTTNG_ERR_FILTER_INVAL;
3543 free(exclusion);
3544 goto error;
3545 }
3546
3547 filter_expression = zmalloc(expression_len);
3548 if (!filter_expression) {
3549 free(exclusion);
3550 ret = LTTNG_ERR_FILTER_NOMEM;
3551 goto error;
3552 }
3553
3554 /* Receive var. len. data */
3555 DBG("Receiving var len filter's expression from client ...");
3556 ret = lttcomm_recv_unix_sock(sock, filter_expression,
3557 expression_len);
3558 if (ret <= 0) {
3559 DBG("Nothing recv() from client car len data... continuing");
3560 *sock_error = 1;
3561 free(filter_expression);
3562 free(exclusion);
3563 ret = LTTNG_ERR_FILTER_INVAL;
3564 goto error;
3565 }
3566 }
3567
3568 /* Handle filter and get bytecode from client. */
3569 if (cmd_ctx->lsm->u.enable.bytecode_len > 0) {
3570 size_t bytecode_len = cmd_ctx->lsm->u.enable.bytecode_len;
3571
3572 if (bytecode_len > LTTNG_FILTER_MAX_LEN) {
3573 ret = LTTNG_ERR_FILTER_INVAL;
3574 free(filter_expression);
3575 free(exclusion);
3576 goto error;
3577 }
3578
3579 bytecode = zmalloc(bytecode_len);
3580 if (!bytecode) {
3581 free(filter_expression);
3582 free(exclusion);
3583 ret = LTTNG_ERR_FILTER_NOMEM;
3584 goto error;
3585 }
3586
3587 /* Receive var. len. data */
3588 DBG("Receiving var len filter's bytecode from client ...");
3589 ret = lttcomm_recv_unix_sock(sock, bytecode, bytecode_len);
3590 if (ret <= 0) {
3591 DBG("Nothing recv() from client car len data... continuing");
3592 *sock_error = 1;
3593 free(filter_expression);
3594 free(bytecode);
3595 free(exclusion);
3596 ret = LTTNG_ERR_FILTER_INVAL;
3597 goto error;
3598 }
3599
3600 if ((bytecode->len + sizeof(*bytecode)) != bytecode_len) {
3601 free(filter_expression);
3602 free(bytecode);
3603 free(exclusion);
3604 ret = LTTNG_ERR_FILTER_INVAL;
3605 goto error;
3606 }
3607 }
3608
3609 ret = cmd_enable_event(cmd_ctx->session, &cmd_ctx->lsm->domain,
3610 cmd_ctx->lsm->u.enable.channel_name,
3611 &cmd_ctx->lsm->u.enable.event,
3612 filter_expression, bytecode, exclusion,
3613 kernel_poll_pipe[1]);
3614 break;
3615 }
3616 case LTTNG_LIST_TRACEPOINTS:
3617 {
3618 struct lttng_event *events;
3619 ssize_t nb_events;
3620
3621 session_lock_list();
3622 nb_events = cmd_list_tracepoints(cmd_ctx->lsm->domain.type, &events);
3623 session_unlock_list();
3624 if (nb_events < 0) {
3625 /* Return value is a negative lttng_error_code. */
3626 ret = -nb_events;
3627 goto error;
3628 }
3629
3630 /*
3631 * Setup lttng message with payload size set to the event list size in
3632 * bytes and then copy list into the llm payload.
3633 */
3634 ret = setup_lttng_msg_no_cmd_header(cmd_ctx, events,
3635 sizeof(struct lttng_event) * nb_events);
3636 free(events);
3637
3638 if (ret < 0) {
3639 goto setup_error;
3640 }
3641
3642 ret = LTTNG_OK;
3643 break;
3644 }
3645 case LTTNG_LIST_TRACEPOINT_FIELDS:
3646 {
3647 struct lttng_event_field *fields;
3648 ssize_t nb_fields;
3649
3650 session_lock_list();
3651 nb_fields = cmd_list_tracepoint_fields(cmd_ctx->lsm->domain.type,
3652 &fields);
3653 session_unlock_list();
3654 if (nb_fields < 0) {
3655 /* Return value is a negative lttng_error_code. */
3656 ret = -nb_fields;
3657 goto error;
3658 }
3659
3660 /*
3661 * Setup lttng message with payload size set to the event list size in
3662 * bytes and then copy list into the llm payload.
3663 */
3664 ret = setup_lttng_msg_no_cmd_header(cmd_ctx, fields,
3665 sizeof(struct lttng_event_field) * nb_fields);
3666 free(fields);
3667
3668 if (ret < 0) {
3669 goto setup_error;
3670 }
3671
3672 ret = LTTNG_OK;
3673 break;
3674 }
3675 case LTTNG_LIST_SYSCALLS:
3676 {
3677 struct lttng_event *events;
3678 ssize_t nb_events;
3679
3680 nb_events = cmd_list_syscalls(&events);
3681 if (nb_events < 0) {
3682 /* Return value is a negative lttng_error_code. */
3683 ret = -nb_events;
3684 goto error;
3685 }
3686
3687 /*
3688 * Setup lttng message with payload size set to the event list size in
3689 * bytes and then copy list into the llm payload.
3690 */
3691 ret = setup_lttng_msg_no_cmd_header(cmd_ctx, events,
3692 sizeof(struct lttng_event) * nb_events);
3693 free(events);
3694
3695 if (ret < 0) {
3696 goto setup_error;
3697 }
3698
3699 ret = LTTNG_OK;
3700 break;
3701 }
3702 case LTTNG_LIST_TRACKER_PIDS:
3703 {
3704 int32_t *pids = NULL;
3705 ssize_t nr_pids;
3706
3707 nr_pids = cmd_list_tracker_pids(cmd_ctx->session,
3708 cmd_ctx->lsm->domain.type, &pids);
3709 if (nr_pids < 0) {
3710 /* Return value is a negative lttng_error_code. */
3711 ret = -nr_pids;
3712 goto error;
3713 }
3714
3715 /*
3716 * Setup lttng message with payload size set to the event list size in
3717 * bytes and then copy list into the llm payload.
3718 */
3719 ret = setup_lttng_msg_no_cmd_header(cmd_ctx, pids,
3720 sizeof(int32_t) * nr_pids);
3721 free(pids);
3722
3723 if (ret < 0) {
3724 goto setup_error;
3725 }
3726
3727 ret = LTTNG_OK;
3728 break;
3729 }
3730 case LTTNG_SET_CONSUMER_URI:
3731 {
3732 size_t nb_uri, len;
3733 struct lttng_uri *uris;
3734
3735 nb_uri = cmd_ctx->lsm->u.uri.size;
3736 len = nb_uri * sizeof(struct lttng_uri);
3737
3738 if (nb_uri == 0) {
3739 ret = LTTNG_ERR_INVALID;
3740 goto error;
3741 }
3742
3743 uris = zmalloc(len);
3744 if (uris == NULL) {
3745 ret = LTTNG_ERR_FATAL;
3746 goto error;
3747 }
3748
3749 /* Receive variable len data */
3750 DBG("Receiving %zu URI(s) from client ...", nb_uri);
3751 ret = lttcomm_recv_unix_sock(sock, uris, len);
3752 if (ret <= 0) {
3753 DBG("No URIs received from client... continuing");
3754 *sock_error = 1;
3755 ret = LTTNG_ERR_SESSION_FAIL;
3756 free(uris);
3757 goto error;
3758 }
3759
3760 ret = cmd_set_consumer_uri(cmd_ctx->session, nb_uri, uris);
3761 free(uris);
3762 if (ret != LTTNG_OK) {
3763 goto error;
3764 }
3765
3766
3767 break;
3768 }
3769 case LTTNG_START_TRACE:
3770 {
3771 ret = cmd_start_trace(cmd_ctx->session);
3772 break;
3773 }
3774 case LTTNG_STOP_TRACE:
3775 {
3776 ret = cmd_stop_trace(cmd_ctx->session);
3777 break;
3778 }
3779 case LTTNG_CREATE_SESSION:
3780 {
3781 size_t nb_uri, len;
3782 struct lttng_uri *uris = NULL;
3783
3784 nb_uri = cmd_ctx->lsm->u.uri.size;
3785 len = nb_uri * sizeof(struct lttng_uri);
3786
3787 if (nb_uri > 0) {
3788 uris = zmalloc(len);
3789 if (uris == NULL) {
3790 ret = LTTNG_ERR_FATAL;
3791 goto error;
3792 }
3793
3794 /* Receive variable len data */
3795 DBG("Waiting for %zu URIs from client ...", nb_uri);
3796 ret = lttcomm_recv_unix_sock(sock, uris, len);
3797 if (ret <= 0) {
3798 DBG("No URIs received from client... continuing");
3799 *sock_error = 1;
3800 ret = LTTNG_ERR_SESSION_FAIL;
3801 free(uris);
3802 goto error;
3803 }
3804
3805 if (nb_uri == 1 && uris[0].dtype != LTTNG_DST_PATH) {
3806 DBG("Creating session with ONE network URI is a bad call");
3807 ret = LTTNG_ERR_SESSION_FAIL;
3808 free(uris);
3809 goto error;
3810 }
3811 }
3812
3813 ret = cmd_create_session_uri(cmd_ctx->lsm->session.name, uris, nb_uri,
3814 &cmd_ctx->creds, 0);
3815
3816 free(uris);
3817
3818 break;
3819 }
3820 case LTTNG_DESTROY_SESSION:
3821 {
3822 ret = cmd_destroy_session(cmd_ctx->session, kernel_poll_pipe[1]);
3823
3824 /* Set session to NULL so we do not unlock it after free. */
3825 cmd_ctx->session = NULL;
3826 break;
3827 }
3828 case LTTNG_LIST_DOMAINS:
3829 {
3830 ssize_t nb_dom;
3831 struct lttng_domain *domains = NULL;
3832
3833 nb_dom = cmd_list_domains(cmd_ctx->session, &domains);
3834 if (nb_dom < 0) {
3835 /* Return value is a negative lttng_error_code. */
3836 ret = -nb_dom;
3837 goto error;
3838 }
3839
3840 ret = setup_lttng_msg_no_cmd_header(cmd_ctx, domains,
3841 nb_dom * sizeof(struct lttng_domain));
3842 free(domains);
3843
3844 if (ret < 0) {
3845 goto setup_error;
3846 }
3847
3848 ret = LTTNG_OK;
3849 break;
3850 }
3851 case LTTNG_LIST_CHANNELS:
3852 {
3853 ssize_t payload_size;
3854 struct lttng_channel *channels = NULL;
3855
3856 payload_size = cmd_list_channels(cmd_ctx->lsm->domain.type,
3857 cmd_ctx->session, &channels);
3858 if (payload_size < 0) {
3859 /* Return value is a negative lttng_error_code. */
3860 ret = -payload_size;
3861 goto error;
3862 }
3863
3864 ret = setup_lttng_msg_no_cmd_header(cmd_ctx, channels,
3865 payload_size);
3866 free(channels);
3867
3868 if (ret < 0) {
3869 goto setup_error;
3870 }
3871
3872 ret = LTTNG_OK;
3873 break;
3874 }
3875 case LTTNG_LIST_EVENTS:
3876 {
3877 ssize_t nb_event;
3878 struct lttng_event *events = NULL;
3879 struct lttcomm_event_command_header cmd_header;
3880 size_t total_size;
3881
3882 memset(&cmd_header, 0, sizeof(cmd_header));
3883 /* Extended infos are included at the end of events */
3884 nb_event = cmd_list_events(cmd_ctx->lsm->domain.type,
3885 cmd_ctx->session, cmd_ctx->lsm->u.list.channel_name,
3886 &events, &total_size);
3887
3888 if (nb_event < 0) {
3889 /* Return value is a negative lttng_error_code. */
3890 ret = -nb_event;
3891 goto error;
3892 }
3893
3894 cmd_header.nb_events = nb_event;
3895 ret = setup_lttng_msg(cmd_ctx, events, total_size,
3896 &cmd_header, sizeof(cmd_header));
3897 free(events);
3898
3899 if (ret < 0) {
3900 goto setup_error;
3901 }
3902
3903 ret = LTTNG_OK;
3904 break;
3905 }
3906 case LTTNG_LIST_SESSIONS:
3907 {
3908 unsigned int nr_sessions;
3909 void *sessions_payload;
3910 size_t payload_len;
3911
3912 session_lock_list();
3913 nr_sessions = lttng_sessions_count(
3914 LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds),
3915 LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds));
3916 payload_len = sizeof(struct lttng_session) * nr_sessions;
3917 sessions_payload = zmalloc(payload_len);
3918
3919 if (!sessions_payload) {
3920 session_unlock_list();
3921 ret = -ENOMEM;
3922 goto setup_error;
3923 }
3924
3925 cmd_list_lttng_sessions(sessions_payload,
3926 LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds),
3927 LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds));
3928 session_unlock_list();
3929
3930 ret = setup_lttng_msg_no_cmd_header(cmd_ctx, sessions_payload,
3931 payload_len);
3932 free(sessions_payload);
3933
3934 if (ret < 0) {
3935 goto setup_error;
3936 }
3937
3938 ret = LTTNG_OK;
3939 break;
3940 }
3941 case LTTNG_CALIBRATE:
3942 {
3943 ret = cmd_calibrate(cmd_ctx->lsm->domain.type,
3944 &cmd_ctx->lsm->u.calibrate);
3945 break;
3946 }
3947 case LTTNG_REGISTER_CONSUMER:
3948 {
3949 struct consumer_data *cdata;
3950
3951 switch (cmd_ctx->lsm->domain.type) {
3952 case LTTNG_DOMAIN_KERNEL:
3953 cdata = &kconsumer_data;
3954 break;
3955 default:
3956 ret = LTTNG_ERR_UND;
3957 goto error;
3958 }
3959
3960 ret = cmd_register_consumer(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3961 cmd_ctx->lsm->u.reg.path, cdata);
3962 break;
3963 }
3964 case LTTNG_DATA_PENDING:
3965 {
3966 int pending_ret;
3967 uint8_t pending_ret_byte;
3968
3969 pending_ret = cmd_data_pending(cmd_ctx->session);
3970
3971 /*
3972 * FIXME
3973 *
3974 * This function may returns 0 or 1 to indicate whether or not
3975 * there is data pending. In case of error, it should return an
3976 * LTTNG_ERR code. However, some code paths may still return
3977 * a nondescript error code, which we handle by returning an
3978 * "unknown" error.
3979 */
3980 if (pending_ret == 0 || pending_ret == 1) {
3981 /*
3982 * ret will be set to LTTNG_OK at the end of
3983 * this function.
3984 */
3985 } else if (pending_ret < 0) {
3986 ret = LTTNG_ERR_UNK;
3987 goto setup_error;
3988 } else {
3989 ret = pending_ret;
3990 goto setup_error;
3991 }
3992
3993 pending_ret_byte = (uint8_t) pending_ret;
3994
3995 /* 1 byte to return whether or not data is pending */
3996 ret = setup_lttng_msg_no_cmd_header(cmd_ctx,
3997 &pending_ret_byte, 1);
3998
3999 if (ret < 0) {
4000 goto setup_error;
4001 }
4002
4003 ret = LTTNG_OK;
4004 break;
4005 }
4006 case LTTNG_SNAPSHOT_ADD_OUTPUT:
4007 {
4008 struct lttcomm_lttng_output_id reply;
4009
4010 ret = cmd_snapshot_add_output(cmd_ctx->session,
4011 &cmd_ctx->lsm->u.snapshot_output.output, &reply.id);
4012 if (ret != LTTNG_OK) {
4013 goto error;
4014 }
4015
4016 ret = setup_lttng_msg_no_cmd_header(cmd_ctx, &reply,
4017 sizeof(reply));
4018 if (ret < 0) {
4019 goto setup_error;
4020 }
4021
4022 /* Copy output list into message payload */
4023 ret = LTTNG_OK;
4024 break;
4025 }
4026 case LTTNG_SNAPSHOT_DEL_OUTPUT:
4027 {
4028 ret = cmd_snapshot_del_output(cmd_ctx->session,
4029 &cmd_ctx->lsm->u.snapshot_output.output);
4030 break;
4031 }
4032 case LTTNG_SNAPSHOT_LIST_OUTPUT:
4033 {
4034 ssize_t nb_output;
4035 struct lttng_snapshot_output *outputs = NULL;
4036
4037 nb_output = cmd_snapshot_list_outputs(cmd_ctx->session, &outputs);
4038 if (nb_output < 0) {
4039 ret = -nb_output;
4040 goto error;
4041 }
4042
4043 assert((nb_output > 0 && outputs) || nb_output == 0);
4044 ret = setup_lttng_msg_no_cmd_header(cmd_ctx, outputs,
4045 nb_output * sizeof(struct lttng_snapshot_output));
4046 free(outputs);
4047
4048 if (ret < 0) {
4049 goto setup_error;
4050 }
4051
4052 ret = LTTNG_OK;
4053 break;
4054 }
4055 case LTTNG_SNAPSHOT_RECORD:
4056 {
4057 ret = cmd_snapshot_record(cmd_ctx->session,
4058 &cmd_ctx->lsm->u.snapshot_record.output,
4059 cmd_ctx->lsm->u.snapshot_record.wait);
4060 break;
4061 }
4062 case LTTNG_CREATE_SESSION_SNAPSHOT:
4063 {
4064 size_t nb_uri, len;
4065 struct lttng_uri *uris = NULL;
4066
4067 nb_uri = cmd_ctx->lsm->u.uri.size;
4068 len = nb_uri * sizeof(struct lttng_uri);
4069
4070 if (nb_uri > 0) {
4071 uris = zmalloc(len);
4072 if (uris == NULL) {
4073 ret = LTTNG_ERR_FATAL;
4074 goto error;
4075 }
4076
4077 /* Receive variable len data */
4078 DBG("Waiting for %zu URIs from client ...", nb_uri);
4079 ret = lttcomm_recv_unix_sock(sock, uris, len);
4080 if (ret <= 0) {
4081 DBG("No URIs received from client... continuing");
4082 *sock_error = 1;
4083 ret = LTTNG_ERR_SESSION_FAIL;
4084 free(uris);
4085 goto error;
4086 }
4087
4088 if (nb_uri == 1 && uris[0].dtype != LTTNG_DST_PATH) {
4089 DBG("Creating session with ONE network URI is a bad call");
4090 ret = LTTNG_ERR_SESSION_FAIL;
4091 free(uris);
4092 goto error;
4093 }
4094 }
4095
4096 ret = cmd_create_session_snapshot(cmd_ctx->lsm->session.name, uris,
4097 nb_uri, &cmd_ctx->creds);
4098 free(uris);
4099 break;
4100 }
4101 case LTTNG_CREATE_SESSION_LIVE:
4102 {
4103 size_t nb_uri, len;
4104 struct lttng_uri *uris = NULL;
4105
4106 nb_uri = cmd_ctx->lsm->u.uri.size;
4107 len = nb_uri * sizeof(struct lttng_uri);
4108
4109 if (nb_uri > 0) {
4110 uris = zmalloc(len);
4111 if (uris == NULL) {
4112 ret = LTTNG_ERR_FATAL;
4113 goto error;
4114 }
4115
4116 /* Receive variable len data */
4117 DBG("Waiting for %zu URIs from client ...", nb_uri);
4118 ret = lttcomm_recv_unix_sock(sock, uris, len);
4119 if (ret <= 0) {
4120 DBG("No URIs received from client... continuing");
4121 *sock_error = 1;
4122 ret = LTTNG_ERR_SESSION_FAIL;
4123 free(uris);
4124 goto error;
4125 }
4126
4127 if (nb_uri == 1 && uris[0].dtype != LTTNG_DST_PATH) {
4128 DBG("Creating session with ONE network URI is a bad call");
4129 ret = LTTNG_ERR_SESSION_FAIL;
4130 free(uris);
4131 goto error;
4132 }
4133 }
4134
4135 ret = cmd_create_session_uri(cmd_ctx->lsm->session.name, uris,
4136 nb_uri, &cmd_ctx->creds, cmd_ctx->lsm->u.session_live.timer_interval);
4137 free(uris);
4138 break;
4139 }
4140 case LTTNG_SAVE_SESSION:
4141 {
4142 ret = cmd_save_sessions(&cmd_ctx->lsm->u.save_session.attr,
4143 &cmd_ctx->creds);
4144 break;
4145 }
4146 case LTTNG_SET_SESSION_SHM_PATH:
4147 {
4148 ret = cmd_set_session_shm_path(cmd_ctx->session,
4149 cmd_ctx->lsm->u.set_shm_path.shm_path);
4150 break;
4151 }
4152 case LTTNG_METADATA_REGENERATE:
4153 {
4154 ret = cmd_metadata_regenerate(cmd_ctx->session);
4155 break;
4156 }
4157 default:
4158 ret = LTTNG_ERR_UND;
4159 break;
4160 }
4161
4162 error:
4163 if (cmd_ctx->llm == NULL) {
4164 DBG("Missing llm structure. Allocating one.");
4165 if (setup_lttng_msg_no_cmd_header(cmd_ctx, NULL, 0) < 0) {
4166 goto setup_error;
4167 }
4168 }
4169 /* Set return code */
4170 cmd_ctx->llm->ret_code = ret;
4171 setup_error:
4172 if (cmd_ctx->session) {
4173 session_unlock(cmd_ctx->session);
4174 }
4175 if (need_tracing_session) {
4176 session_unlock_list();
4177 }
4178 init_setup_error:
4179 assert(!rcu_read_ongoing());
4180 return ret;
4181 }
4182
4183 /*
4184 * Thread managing health check socket.
4185 */
4186 static void *thread_manage_health(void *data)
4187 {
4188 int sock = -1, new_sock = -1, ret, i, pollfd, err = -1;
4189 uint32_t revents, nb_fd;
4190 struct lttng_poll_event events;
4191 struct health_comm_msg msg;
4192 struct health_comm_reply reply;
4193
4194 DBG("[thread] Manage health check started");
4195
4196 rcu_register_thread();
4197
4198 /* We might hit an error path before this is created. */
4199 lttng_poll_init(&events);
4200
4201 /* Create unix socket */
4202 sock = lttcomm_create_unix_sock(health_unix_sock_path);
4203 if (sock < 0) {
4204 ERR("Unable to create health check Unix socket");
4205 ret = -1;
4206 goto error;
4207 }
4208
4209 if (is_root) {
4210 /* lttng health client socket path permissions */
4211 ret = chown(health_unix_sock_path, 0,
4212 utils_get_group_id(tracing_group_name));
4213 if (ret < 0) {
4214 ERR("Unable to set group on %s", health_unix_sock_path);
4215 PERROR("chown");
4216 ret = -1;
4217 goto error;
4218 }
4219
4220 ret = chmod(health_unix_sock_path,
4221 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
4222 if (ret < 0) {
4223 ERR("Unable to set permissions on %s", health_unix_sock_path);
4224 PERROR("chmod");
4225 ret = -1;
4226 goto error;
4227 }
4228 }
4229
4230 /*
4231 * Set the CLOEXEC flag. Return code is useless because either way, the
4232 * show must go on.
4233 */
4234 (void) utils_set_fd_cloexec(sock);
4235
4236 ret = lttcomm_listen_unix_sock(sock);
4237 if (ret < 0) {
4238 goto error;
4239 }
4240
4241 /*
4242 * Pass 2 as size here for the thread quit pipe and client_sock. Nothing
4243 * more will be added to this poll set.
4244 */
4245 ret = sessiond_set_thread_pollset(&events, 2);
4246 if (ret < 0) {
4247 goto error;
4248 }
4249
4250 /* Add the application registration socket */
4251 ret = lttng_poll_add(&events, sock, LPOLLIN | LPOLLPRI);
4252 if (ret < 0) {
4253 goto error;
4254 }
4255
4256 sessiond_notify_ready();
4257
4258 while (1) {
4259 DBG("Health check ready");
4260
4261 /* Inifinite blocking call, waiting for transmission */
4262 restart:
4263 ret = lttng_poll_wait(&events, -1);
4264 if (ret < 0) {
4265 /*
4266 * Restart interrupted system call.
4267 */
4268 if (errno == EINTR) {
4269 goto restart;
4270 }
4271 goto error;
4272 }
4273
4274 nb_fd = ret;
4275
4276 for (i = 0; i < nb_fd; i++) {
4277 /* Fetch once the poll data */
4278 revents = LTTNG_POLL_GETEV(&events, i);
4279 pollfd = LTTNG_POLL_GETFD(&events, i);
4280
4281 if (!revents) {
4282 /* No activity for this FD (poll implementation). */
4283 continue;
4284 }
4285
4286 /* Thread quit pipe has been closed. Killing thread. */
4287 ret = sessiond_check_thread_quit_pipe(pollfd, revents);
4288 if (ret) {
4289 err = 0;
4290 goto exit;
4291 }
4292
4293 /* Event on the registration socket */
4294 if (pollfd == sock) {
4295 if (revents & LPOLLIN) {
4296 continue;
4297 } else if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
4298 ERR("Health socket poll error");
4299 goto error;
4300 } else {
4301 ERR("Unexpected poll events %u for sock %d", revents, pollfd);
4302 goto error;
4303 }
4304 }
4305 }
4306
4307 new_sock = lttcomm_accept_unix_sock(sock);
4308 if (new_sock < 0) {
4309 goto error;
4310 }
4311
4312 /*
4313 * Set the CLOEXEC flag. Return code is useless because either way, the
4314 * show must go on.
4315 */
4316 (void) utils_set_fd_cloexec(new_sock);
4317
4318 DBG("Receiving data from client for health...");
4319 ret = lttcomm_recv_unix_sock(new_sock, (void *)&msg, sizeof(msg));
4320 if (ret <= 0) {
4321 DBG("Nothing recv() from client... continuing");
4322 ret = close(new_sock);
4323 if (ret) {
4324 PERROR("close");
4325 }
4326 new_sock = -1;
4327 continue;
4328 }
4329
4330 rcu_thread_online();
4331
4332 memset(&reply, 0, sizeof(reply));
4333 for (i = 0; i < NR_HEALTH_SESSIOND_TYPES; i++) {
4334 /*
4335 * health_check_state returns 0 if health is
4336 * bad.
4337 */
4338 if (!health_check_state(health_sessiond, i)) {
4339 reply.ret_code |= 1ULL << i;
4340 }
4341 }
4342
4343 DBG2("Health check return value %" PRIx64, reply.ret_code);
4344
4345 ret = send_unix_sock(new_sock, (void *) &reply, sizeof(reply));
4346 if (ret < 0) {
4347 ERR("Failed to send health data back to client");
4348 }
4349
4350 /* End of transmission */
4351 ret = close(new_sock);
4352 if (ret) {
4353 PERROR("close");
4354 }
4355 new_sock = -1;
4356 }
4357
4358 exit:
4359 error:
4360 if (err) {
4361 ERR("Health error occurred in %s", __func__);
4362 }
4363 DBG("Health check thread dying");
4364 unlink(health_unix_sock_path);
4365 if (sock >= 0) {
4366 ret = close(sock);
4367 if (ret) {
4368 PERROR("close");
4369 }
4370 }
4371
4372 lttng_poll_clean(&events);
4373
4374 rcu_unregister_thread();
4375 return NULL;
4376 }
4377
4378 /*
4379 * This thread manage all clients request using the unix client socket for
4380 * communication.
4381 */
4382 static void *thread_manage_clients(void *data)
4383 {
4384 int sock = -1, ret, i, pollfd, err = -1;
4385 int sock_error;
4386 uint32_t revents, nb_fd;
4387 struct command_ctx *cmd_ctx = NULL;
4388 struct lttng_poll_event events;
4389
4390 DBG("[thread] Manage client started");
4391
4392 rcu_register_thread();
4393
4394 health_register(health_sessiond, HEALTH_SESSIOND_TYPE_CMD);
4395
4396 health_code_update();
4397
4398 ret = lttcomm_listen_unix_sock(client_sock);
4399 if (ret < 0) {
4400 goto error_listen;
4401 }
4402
4403 /*
4404 * Pass 2 as size here for the thread quit pipe and client_sock. Nothing
4405 * more will be added to this poll set.
4406 */
4407 ret = sessiond_set_thread_pollset(&events, 2);
4408 if (ret < 0) {
4409 goto error_create_poll;
4410 }
4411
4412 /* Add the application registration socket */
4413 ret = lttng_poll_add(&events, client_sock, LPOLLIN | LPOLLPRI);
4414 if (ret < 0) {
4415 goto error;
4416 }
4417
4418 sessiond_notify_ready();
4419 ret = sem_post(&load_info->message_thread_ready);
4420 if (ret) {
4421 PERROR("sem_post message_thread_ready");
4422 goto error;
4423 }
4424
4425 /* This testpoint is after we signal readiness to the parent. */
4426 if (testpoint(sessiond_thread_manage_clients)) {
4427 goto error;
4428 }
4429
4430 if (testpoint(sessiond_thread_manage_clients_before_loop)) {
4431 goto error;
4432 }
4433
4434 health_code_update();
4435
4436 while (1) {
4437 DBG("Accepting client command ...");
4438
4439 /* Inifinite blocking call, waiting for transmission */
4440 restart:
4441 health_poll_entry();
4442 ret = lttng_poll_wait(&events, -1);
4443 health_poll_exit();
4444 if (ret < 0) {
4445 /*
4446 * Restart interrupted system call.
4447 */
4448 if (errno == EINTR) {
4449 goto restart;
4450 }
4451 goto error;
4452 }
4453
4454 nb_fd = ret;
4455
4456 for (i = 0; i < nb_fd; i++) {
4457 /* Fetch once the poll data */
4458 revents = LTTNG_POLL_GETEV(&events, i);
4459 pollfd = LTTNG_POLL_GETFD(&events, i);
4460
4461 health_code_update();
4462
4463 if (!revents) {
4464 /* No activity for this FD (poll implementation). */
4465 continue;
4466 }
4467
4468 /* Thread quit pipe has been closed. Killing thread. */
4469 ret = sessiond_check_thread_quit_pipe(pollfd, revents);
4470 if (ret) {
4471 err = 0;
4472 goto exit;
4473 }
4474
4475 /* Event on the registration socket */
4476 if (pollfd == client_sock) {
4477 if (revents & LPOLLIN) {
4478 continue;
4479 } else if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
4480 ERR("Client socket poll error");
4481 goto error;
4482 } else {
4483 ERR("Unexpected poll events %u for sock %d", revents, pollfd);
4484 goto error;
4485 }
4486 }
4487 }
4488
4489 DBG("Wait for client response");
4490
4491 health_code_update();
4492
4493 sock = lttcomm_accept_unix_sock(client_sock);
4494 if (sock < 0) {
4495 goto error;
4496 }
4497
4498 /*
4499 * Set the CLOEXEC flag. Return code is useless because either way, the
4500 * show must go on.
4501 */
4502 (void) utils_set_fd_cloexec(sock);
4503
4504 /* Set socket option for credentials retrieval */
4505 ret = lttcomm_setsockopt_creds_unix_sock(sock);
4506 if (ret < 0) {
4507 goto error;
4508 }
4509
4510 /* Allocate context command to process the client request */
4511 cmd_ctx = zmalloc(sizeof(struct command_ctx));
4512 if (cmd_ctx == NULL) {
4513 PERROR("zmalloc cmd_ctx");
4514 goto error;
4515 }
4516
4517 /* Allocate data buffer for reception */
4518 cmd_ctx->lsm = zmalloc(sizeof(struct lttcomm_session_msg));
4519 if (cmd_ctx->lsm == NULL) {
4520 PERROR("zmalloc cmd_ctx->lsm");
4521 goto error;
4522 }
4523
4524 cmd_ctx->llm = NULL;
4525 cmd_ctx->session = NULL;
4526
4527 health_code_update();
4528
4529 /*
4530 * Data is received from the lttng client. The struct
4531 * lttcomm_session_msg (lsm) contains the command and data request of
4532 * the client.
4533 */
4534 DBG("Receiving data from client ...");
4535 ret = lttcomm_recv_creds_unix_sock(sock, cmd_ctx->lsm,
4536 sizeof(struct lttcomm_session_msg), &cmd_ctx->creds);
4537 if (ret <= 0) {
4538 DBG("Nothing recv() from client... continuing");
4539 ret = close(sock);
4540 if (ret) {
4541 PERROR("close");
4542 }
4543 sock = -1;
4544 clean_command_ctx(&cmd_ctx);
4545 continue;
4546 }
4547
4548 health_code_update();
4549
4550 // TODO: Validate cmd_ctx including sanity check for
4551 // security purpose.
4552
4553 rcu_thread_online();
4554 /*
4555 * This function dispatch the work to the kernel or userspace tracer
4556 * libs and fill the lttcomm_lttng_msg data structure of all the needed
4557 * informations for the client. The command context struct contains
4558 * everything this function may needs.
4559 */
4560 ret = process_client_msg(cmd_ctx, sock, &sock_error);
4561 rcu_thread_offline();
4562 if (ret < 0) {
4563 ret = close(sock);
4564 if (ret) {
4565 PERROR("close");
4566 }
4567 sock = -1;
4568 /*
4569 * TODO: Inform client somehow of the fatal error. At
4570 * this point, ret < 0 means that a zmalloc failed
4571 * (ENOMEM). Error detected but still accept
4572 * command, unless a socket error has been
4573 * detected.
4574 */
4575 clean_command_ctx(&cmd_ctx);
4576 continue;
4577 }
4578
4579 health_code_update();
4580
4581 DBG("Sending response (size: %d, retcode: %s (%d))",
4582 cmd_ctx->lttng_msg_size,
4583 lttng_strerror(-cmd_ctx->llm->ret_code),
4584 cmd_ctx->llm->ret_code);
4585 ret = send_unix_sock(sock, cmd_ctx->llm, cmd_ctx->lttng_msg_size);
4586 if (ret < 0) {
4587 ERR("Failed to send data back to client");
4588 }
4589
4590 /* End of transmission */
4591 ret = close(sock);
4592 if (ret) {
4593 PERROR("close");
4594 }
4595 sock = -1;
4596
4597 clean_command_ctx(&cmd_ctx);
4598
4599 health_code_update();
4600 }
4601
4602 exit:
4603 error:
4604 if (sock >= 0) {
4605 ret = close(sock);
4606 if (ret) {
4607 PERROR("close");
4608 }
4609 }
4610
4611 lttng_poll_clean(&events);
4612 clean_command_ctx(&cmd_ctx);
4613
4614 error_listen:
4615 error_create_poll:
4616 unlink(client_unix_sock_path);
4617 if (client_sock >= 0) {
4618 ret = close(client_sock);
4619 if (ret) {
4620 PERROR("close");
4621 }
4622 }
4623
4624 if (err) {
4625 health_error();
4626 ERR("Health error occurred in %s", __func__);
4627 }
4628
4629 health_unregister(health_sessiond);
4630
4631 DBG("Client thread dying");
4632
4633 rcu_unregister_thread();
4634
4635 /*
4636 * Since we are creating the consumer threads, we own them, so we need
4637 * to join them before our thread exits.
4638 */
4639 ret = join_consumer_thread(&kconsumer_data);
4640 if (ret) {
4641 errno = ret;
4642 PERROR("join_consumer");
4643 }
4644
4645 ret = join_consumer_thread(&ustconsumer32_data);
4646 if (ret) {
4647 errno = ret;
4648 PERROR("join_consumer ust32");
4649 }
4650
4651 ret = join_consumer_thread(&ustconsumer64_data);
4652 if (ret) {
4653 errno = ret;
4654 PERROR("join_consumer ust64");
4655 }
4656 return NULL;
4657 }
4658
4659 static int string_match(const char *str1, const char *str2)
4660 {
4661 return (str1 && str2) && !strcmp(str1, str2);
4662 }
4663
4664 /*
4665 * Take an option from the getopt output and set it in the right variable to be
4666 * used later.
4667 *
4668 * Return 0 on success else a negative value.
4669 */
4670 static int set_option(int opt, const char *arg, const char *optname)
4671 {
4672 int ret = 0;
4673
4674 if (string_match(optname, "client-sock") || opt == 'c') {
4675 if (!arg || *arg == '\0') {
4676 ret = -EINVAL;
4677 goto end;
4678 }
4679 if (lttng_is_setuid_setgid()) {
4680 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
4681 "-c, --client-sock");
4682 } else {
4683 snprintf(client_unix_sock_path, PATH_MAX, "%s", arg);
4684 }
4685 } else if (string_match(optname, "apps-sock") || opt == 'a') {
4686 if (!arg || *arg == '\0') {
4687 ret = -EINVAL;
4688 goto end;
4689 }
4690 if (lttng_is_setuid_setgid()) {
4691 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
4692 "-a, --apps-sock");
4693 } else {
4694 snprintf(apps_unix_sock_path, PATH_MAX, "%s", arg);
4695 }
4696 } else if (string_match(optname, "daemonize") || opt == 'd') {
4697 opt_daemon = 1;
4698 } else if (string_match(optname, "background") || opt == 'b') {
4699 opt_background = 1;
4700 } else if (string_match(optname, "group") || opt == 'g') {
4701 if (!arg || *arg == '\0') {
4702 ret = -EINVAL;
4703 goto end;
4704 }
4705 if (lttng_is_setuid_setgid()) {
4706 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
4707 "-g, --group");
4708 } else {
4709 /*
4710 * If the override option is set, the pointer points to a
4711 * *non* const thus freeing it even though the variable type is
4712 * set to const.
4713 */
4714 if (tracing_group_name_override) {
4715 free((void *) tracing_group_name);
4716 }
4717 tracing_group_name = strdup(arg);
4718 if (!tracing_group_name) {
4719 PERROR("strdup");
4720 ret = -ENOMEM;
4721 }
4722 tracing_group_name_override = 1;
4723 }
4724 } else if (string_match(optname, "help") || opt == 'h') {
4725 ret = utils_show_man_page(8, "lttng-sessiond");
4726 if (ret) {
4727 ERR("Cannot view man page lttng-sessiond(8)");
4728 perror("exec");
4729 }
4730 exit(ret ? EXIT_FAILURE : EXIT_SUCCESS);
4731 } else if (string_match(optname, "version") || opt == 'V') {
4732 fprintf(stdout, "%s\n", VERSION);
4733 exit(EXIT_SUCCESS);
4734 } else if (string_match(optname, "sig-parent") || opt == 'S') {
4735 opt_sig_parent = 1;
4736 } else if (string_match(optname, "kconsumerd-err-sock")) {
4737 if (!arg || *arg == '\0') {
4738 ret = -EINVAL;
4739 goto end;
4740 }
4741 if (lttng_is_setuid_setgid()) {
4742 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
4743 "--kconsumerd-err-sock");
4744 } else {
4745 snprintf(kconsumer_data.err_unix_sock_path, PATH_MAX, "%s", arg);
4746 }
4747 } else if (string_match(optname, "kconsumerd-cmd-sock")) {
4748 if (!arg || *arg == '\0') {
4749 ret = -EINVAL;
4750 goto end;
4751 }
4752 if (lttng_is_setuid_setgid()) {
4753 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
4754 "--kconsumerd-cmd-sock");
4755 } else {
4756 snprintf(kconsumer_data.cmd_unix_sock_path, PATH_MAX, "%s", arg);
4757 }
4758 } else if (string_match(optname, "ustconsumerd64-err-sock")) {
4759 if (!arg || *arg == '\0') {
4760 ret = -EINVAL;
4761 goto end;
4762 }
4763 if (lttng_is_setuid_setgid()) {
4764 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
4765 "--ustconsumerd64-err-sock");
4766 } else {
4767 snprintf(ustconsumer64_data.err_unix_sock_path, PATH_MAX, "%s", arg);
4768 }
4769 } else if (string_match(optname, "ustconsumerd64-cmd-sock")) {
4770 if (!arg || *arg == '\0') {
4771 ret = -EINVAL;
4772 goto end;
4773 }
4774 if (lttng_is_setuid_setgid()) {
4775 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
4776 "--ustconsumerd64-cmd-sock");
4777 } else {
4778 snprintf(ustconsumer64_data.cmd_unix_sock_path, PATH_MAX, "%s", arg);
4779 }
4780 } else if (string_match(optname, "ustconsumerd32-err-sock")) {
4781 if (!arg || *arg == '\0') {
4782 ret = -EINVAL;
4783 goto end;
4784 }
4785 if (lttng_is_setuid_setgid()) {
4786 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
4787 "--ustconsumerd32-err-sock");
4788 } else {
4789 snprintf(ustconsumer32_data.err_unix_sock_path, PATH_MAX, "%s", arg);
4790 }
4791 } else if (string_match(optname, "ustconsumerd32-cmd-sock")) {
4792 if (!arg || *arg == '\0') {
4793 ret = -EINVAL;
4794 goto end;
4795 }
4796 if (lttng_is_setuid_setgid()) {
4797 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
4798 "--ustconsumerd32-cmd-sock");
4799 } else {
4800 snprintf(ustconsumer32_data.cmd_unix_sock_path, PATH_MAX, "%s", arg);
4801 }
4802 } else if (string_match(optname, "no-kernel")) {
4803 opt_no_kernel = 1;
4804 } else if (string_match(optname, "quiet") || opt == 'q') {
4805 lttng_opt_quiet = 1;
4806 } else if (string_match(optname, "verbose") || opt == 'v') {
4807 /* Verbose level can increase using multiple -v */
4808 if (arg) {
4809 /* Value obtained from config file */
4810 lttng_opt_verbose = config_parse_value(arg);
4811 } else {
4812 /* -v used on command line */
4813 lttng_opt_verbose++;
4814 }
4815 /* Clamp value to [0, 3] */
4816 lttng_opt_verbose = lttng_opt_verbose < 0 ? 0 :
4817 (lttng_opt_verbose <= 3 ? lttng_opt_verbose : 3);
4818 } else if (string_match(optname, "verbose-consumer")) {
4819 if (arg) {
4820 opt_verbose_consumer = config_parse_value(arg);
4821 } else {
4822 opt_verbose_consumer++;
4823 }
4824 } else if (string_match(optname, "consumerd32-path")) {
4825 if (!arg || *arg == '\0') {
4826 ret = -EINVAL;
4827 goto end;
4828 }
4829 if (lttng_is_setuid_setgid()) {
4830 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
4831 "--consumerd32-path");
4832 } else {
4833 if (consumerd32_bin_override) {
4834 free((void *) consumerd32_bin);
4835 }
4836 consumerd32_bin = strdup(arg);
4837 if (!consumerd32_bin) {
4838 PERROR("strdup");
4839 ret = -ENOMEM;
4840 }
4841 consumerd32_bin_override = 1;
4842 }
4843 } else if (string_match(optname, "consumerd32-libdir")) {
4844 if (!arg || *arg == '\0') {
4845 ret = -EINVAL;
4846 goto end;
4847 }
4848 if (lttng_is_setuid_setgid()) {
4849 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
4850 "--consumerd32-libdir");
4851 } else {
4852 if (consumerd32_libdir_override) {
4853 free((void *) consumerd32_libdir);
4854 }
4855 consumerd32_libdir = strdup(arg);
4856 if (!consumerd32_libdir) {
4857 PERROR("strdup");
4858 ret = -ENOMEM;
4859 }
4860 consumerd32_libdir_override = 1;
4861 }
4862 } else if (string_match(optname, "consumerd64-path")) {
4863 if (!arg || *arg == '\0') {
4864 ret = -EINVAL;
4865 goto end;
4866 }
4867 if (lttng_is_setuid_setgid()) {
4868 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
4869 "--consumerd64-path");
4870 } else {
4871 if (consumerd64_bin_override) {
4872 free((void *) consumerd64_bin);
4873 }
4874 consumerd64_bin = strdup(arg);
4875 if (!consumerd64_bin) {
4876 PERROR("strdup");
4877 ret = -ENOMEM;
4878 }
4879 consumerd64_bin_override = 1;
4880 }
4881 } else if (string_match(optname, "consumerd64-libdir")) {
4882 if (!arg || *arg == '\0') {
4883 ret = -EINVAL;
4884 goto end;
4885 }
4886 if (lttng_is_setuid_setgid()) {
4887 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
4888 "--consumerd64-libdir");
4889 } else {
4890 if (consumerd64_libdir_override) {
4891 free((void *) consumerd64_libdir);
4892 }
4893 consumerd64_libdir = strdup(arg);
4894 if (!consumerd64_libdir) {
4895 PERROR("strdup");
4896 ret = -ENOMEM;
4897 }
4898 consumerd64_libdir_override = 1;
4899 }
4900 } else if (string_match(optname, "pidfile") || opt == 'p') {
4901 if (!arg || *arg == '\0') {
4902 ret = -EINVAL;
4903 goto end;
4904 }
4905 if (lttng_is_setuid_setgid()) {
4906 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
4907 "-p, --pidfile");
4908 } else {
4909 free(opt_pidfile);
4910 opt_pidfile = strdup(arg);
4911 if (!opt_pidfile) {
4912 PERROR("strdup");
4913 ret = -ENOMEM;
4914 }
4915 }
4916 } else if (string_match(optname, "agent-tcp-port")) {
4917 if (!arg || *arg == '\0') {
4918 ret = -EINVAL;
4919 goto end;
4920 }
4921 if (lttng_is_setuid_setgid()) {
4922 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
4923 "--agent-tcp-port");
4924 } else {
4925 unsigned long v;
4926
4927 if (!arg) {
4928 ret = -EINVAL;
4929 goto end;
4930 }
4931 errno = 0;
4932 v = strtoul(arg, NULL, 0);
4933 if (errno != 0 || !isdigit(arg[0])) {
4934 ERR("Wrong value in --agent-tcp-port parameter: %s", arg);
4935 return -1;
4936 }
4937 if (v == 0 || v >= 65535) {
4938 ERR("Port overflow in --agent-tcp-port parameter: %s", arg);
4939 return -1;
4940 }
4941 agent_tcp_port = (uint32_t) v;
4942 DBG3("Agent TCP port set to non default: %u", agent_tcp_port);
4943 }
4944 } else if (string_match(optname, "load") || opt == 'l') {
4945 if (!arg || *arg == '\0') {
4946 ret = -EINVAL;
4947 goto end;
4948 }
4949 if (lttng_is_setuid_setgid()) {
4950 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
4951 "-l, --load");
4952 } else {
4953 free(opt_load_session_path);
4954 opt_load_session_path = strdup(arg);
4955 if (!opt_load_session_path) {
4956 PERROR("strdup");
4957 ret = -ENOMEM;
4958 }
4959 }
4960 } else if (string_match(optname, "kmod-probes")) {
4961 if (!arg || *arg == '\0') {
4962 ret = -EINVAL;
4963 goto end;
4964 }
4965 if (lttng_is_setuid_setgid()) {
4966 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
4967 "--kmod-probes");
4968 } else {
4969 free(kmod_probes_list);
4970 kmod_probes_list = strdup(arg);
4971 if (!kmod_probes_list) {
4972 PERROR("strdup");
4973 ret = -ENOMEM;
4974 }
4975 }
4976 } else if (string_match(optname, "extra-kmod-probes")) {
4977 if (!arg || *arg == '\0') {
4978 ret = -EINVAL;
4979 goto end;
4980 }
4981 if (lttng_is_setuid_setgid()) {
4982 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
4983 "--extra-kmod-probes");
4984 } else {
4985 free(kmod_extra_probes_list);
4986 kmod_extra_probes_list = strdup(arg);
4987 if (!kmod_extra_probes_list) {
4988 PERROR("strdup");
4989 ret = -ENOMEM;
4990 }
4991 }
4992 } else if (string_match(optname, "config") || opt == 'f') {
4993 /* This is handled in set_options() thus silent skip. */
4994 goto end;
4995 } else {
4996 /* Unknown option or other error.
4997 * Error is printed by getopt, just return */
4998 ret = -1;
4999 }
5000
5001 end:
5002 if (ret == -EINVAL) {
5003 const char *opt_name = "unknown";
5004 int i;
5005
5006 for (i = 0; i < sizeof(long_options) / sizeof(struct option);
5007 i++) {
5008 if (opt == long_options[i].val) {
5009 opt_name = long_options[i].name;
5010 break;
5011 }
5012 }
5013
5014 WARN("Invalid argument provided for option \"%s\", using default value.",
5015 opt_name);
5016 }
5017
5018 return ret;
5019 }
5020
5021 /*
5022 * config_entry_handler_cb used to handle options read from a config file.
5023 * See config_entry_handler_cb comment in common/config/session-config.h for the
5024 * return value conventions.
5025 */
5026 static int config_entry_handler(const struct config_entry *entry, void *unused)
5027 {
5028 int ret = 0, i;
5029
5030 if (!entry || !entry->name || !entry->value) {
5031 ret = -EINVAL;
5032 goto end;
5033 }
5034
5035 /* Check if the option is to be ignored */
5036 for (i = 0; i < sizeof(config_ignore_options) / sizeof(char *); i++) {
5037 if (!strcmp(entry->name, config_ignore_options[i])) {
5038 goto end;
5039 }
5040 }
5041
5042 for (i = 0; i < (sizeof(long_options) / sizeof(struct option)) - 1;
5043 i++) {
5044
5045 /* Ignore if not fully matched. */
5046 if (strcmp(entry->name, long_options[i].name)) {
5047 continue;
5048 }
5049
5050 /*
5051 * If the option takes no argument on the command line, we have to
5052 * check if the value is "true". We support non-zero numeric values,
5053 * true, on and yes.
5054 */
5055 if (!long_options[i].has_arg) {
5056 ret = config_parse_value(entry->value);
5057 if (ret <= 0) {
5058 if (ret) {
5059 WARN("Invalid configuration value \"%s\" for option %s",
5060 entry->value, entry->name);
5061 }
5062 /* False, skip boolean config option. */
5063 goto end;
5064 }
5065 }
5066
5067 ret = set_option(long_options[i].val, entry->value, entry->name);
5068 goto end;
5069 }
5070
5071 WARN("Unrecognized option \"%s\" in daemon configuration file.", entry->name);
5072
5073 end:
5074 return ret;
5075 }
5076
5077 /*
5078 * daemon configuration loading and argument parsing
5079 */
5080 static int set_options(int argc, char **argv)
5081 {
5082 int ret = 0, c = 0, option_index = 0;
5083 int orig_optopt = optopt, orig_optind = optind;
5084 char *optstring;
5085 const char *config_path = NULL;
5086
5087 optstring = utils_generate_optstring(long_options,
5088 sizeof(long_options) / sizeof(struct option));
5089 if (!optstring) {
5090 ret = -ENOMEM;
5091 goto end;
5092 }
5093
5094 /* Check for the --config option */
5095 while ((c = getopt_long(argc, argv, optstring, long_options,
5096 &option_index)) != -1) {
5097 if (c == '?') {
5098 ret = -EINVAL;
5099 goto end;
5100 } else if (c != 'f') {
5101 /* if not equal to --config option. */
5102 continue;
5103 }
5104
5105 if (lttng_is_setuid_setgid()) {
5106 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
5107 "-f, --config");
5108 } else {
5109 config_path = utils_expand_path(optarg);
5110 if (!config_path) {
5111 ERR("Failed to resolve path: %s", optarg);
5112 }
5113 }
5114 }
5115
5116 ret = config_get_section_entries(config_path, config_section_name,
5117 config_entry_handler, NULL);
5118 if (ret) {
5119 if (ret > 0) {
5120 ERR("Invalid configuration option at line %i", ret);
5121 ret = -1;
5122 }
5123 goto end;
5124 }
5125
5126 /* Reset getopt's global state */
5127 optopt = orig_optopt;
5128 optind = orig_optind;
5129 while (1) {
5130 option_index = -1;
5131 /*
5132 * getopt_long() will not set option_index if it encounters a
5133 * short option.
5134 */
5135 c = getopt_long(argc, argv, optstring, long_options,
5136 &option_index);
5137 if (c == -1) {
5138 break;
5139 }
5140
5141 /*
5142 * Pass NULL as the long option name if popt left the index
5143 * unset.
5144 */
5145 ret = set_option(c, optarg,
5146 option_index < 0 ? NULL :
5147 long_options[option_index].name);
5148 if (ret < 0) {
5149 break;
5150 }
5151 }
5152
5153 end:
5154 free(optstring);
5155 return ret;
5156 }
5157
5158 /*
5159 * Creates the two needed socket by the daemon.
5160 * apps_sock - The communication socket for all UST apps.
5161 * client_sock - The communication of the cli tool (lttng).
5162 */
5163 static int init_daemon_socket(void)
5164 {
5165 int ret = 0;
5166 mode_t old_umask;
5167
5168 old_umask = umask(0);
5169
5170 /* Create client tool unix socket */
5171 client_sock = lttcomm_create_unix_sock(client_unix_sock_path);
5172 if (client_sock < 0) {
5173 ERR("Create unix sock failed: %s", client_unix_sock_path);
5174 ret = -1;
5175 goto end;
5176 }
5177
5178 /* Set the cloexec flag */
5179 ret = utils_set_fd_cloexec(client_sock);
5180 if (ret < 0) {
5181 ERR("Unable to set CLOEXEC flag to the client Unix socket (fd: %d). "
5182 "Continuing but note that the consumer daemon will have a "
5183 "reference to this socket on exec()", client_sock);
5184 }
5185
5186 /* File permission MUST be 660 */
5187 ret = chmod(client_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
5188 if (ret < 0) {
5189 ERR("Set file permissions failed: %s", client_unix_sock_path);
5190 PERROR("chmod");
5191 goto end;
5192 }
5193
5194 /* Create the application unix socket */
5195 apps_sock = lttcomm_create_unix_sock(apps_unix_sock_path);
5196 if (apps_sock < 0) {
5197 ERR("Create unix sock failed: %s", apps_unix_sock_path);
5198 ret = -1;
5199 goto end;
5200 }
5201
5202 /* Set the cloexec flag */
5203 ret = utils_set_fd_cloexec(apps_sock);
5204 if (ret < 0) {
5205 ERR("Unable to set CLOEXEC flag to the app Unix socket (fd: %d). "
5206 "Continuing but note that the consumer daemon will have a "
5207 "reference to this socket on exec()", apps_sock);
5208 }
5209
5210 /* File permission MUST be 666 */
5211 ret = chmod(apps_unix_sock_path,
5212 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH);
5213 if (ret < 0) {
5214 ERR("Set file permissions failed: %s", apps_unix_sock_path);
5215 PERROR("chmod");
5216 goto end;
5217 }
5218
5219 DBG3("Session daemon client socket %d and application socket %d created",
5220 client_sock, apps_sock);
5221
5222 end:
5223 umask(old_umask);
5224 return ret;
5225 }
5226
5227 /*
5228 * Check if the global socket is available, and if a daemon is answering at the
5229 * other side. If yes, error is returned.
5230 */
5231 static int check_existing_daemon(void)
5232 {
5233 /* Is there anybody out there ? */
5234 if (lttng_session_daemon_alive()) {
5235 return -EEXIST;
5236 }
5237
5238 return 0;
5239 }
5240
5241 /*
5242 * Set the tracing group gid onto the client socket.
5243 *
5244 * Race window between mkdir and chown is OK because we are going from more
5245 * permissive (root.root) to less permissive (root.tracing).
5246 */
5247 static int set_permissions(char *rundir)
5248 {
5249 int ret;
5250 gid_t gid;
5251
5252 gid = utils_get_group_id(tracing_group_name);
5253
5254 /* Set lttng run dir */
5255 ret = chown(rundir, 0, gid);
5256 if (ret < 0) {
5257 ERR("Unable to set group on %s", rundir);
5258 PERROR("chown");
5259 }
5260
5261 /*
5262 * Ensure all applications and tracing group can search the run
5263 * dir. Allow everyone to read the directory, since it does not
5264 * buy us anything to hide its content.
5265 */
5266 ret = chmod(rundir, S_IRWXU | S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH);
5267 if (ret < 0) {
5268 ERR("Unable to set permissions on %s", rundir);
5269 PERROR("chmod");
5270 }
5271
5272 /* lttng client socket path */
5273 ret = chown(client_unix_sock_path, 0, gid);
5274 if (ret < 0) {
5275 ERR("Unable to set group on %s", client_unix_sock_path);
5276 PERROR("chown");
5277 }
5278
5279 /* kconsumer error socket path */
5280 ret = chown(kconsumer_data.err_unix_sock_path, 0, 0);
5281 if (ret < 0) {
5282 ERR("Unable to set group on %s", kconsumer_data.err_unix_sock_path);
5283 PERROR("chown");
5284 }
5285
5286 /* 64-bit ustconsumer error socket path */
5287 ret = chown(ustconsumer64_data.err_unix_sock_path, 0, 0);
5288 if (ret < 0) {
5289 ERR("Unable to set group on %s", ustconsumer64_data.err_unix_sock_path);
5290 PERROR("chown");
5291 }
5292
5293 /* 32-bit ustconsumer compat32 error socket path */
5294 ret = chown(ustconsumer32_data.err_unix_sock_path, 0, 0);
5295 if (ret < 0) {
5296 ERR("Unable to set group on %s", ustconsumer32_data.err_unix_sock_path);
5297 PERROR("chown");
5298 }
5299
5300 DBG("All permissions are set");
5301
5302 return ret;
5303 }
5304
5305 /*
5306 * Create the lttng run directory needed for all global sockets and pipe.
5307 */
5308 static int create_lttng_rundir(const char *rundir)
5309 {
5310 int ret;
5311
5312 DBG3("Creating LTTng run directory: %s", rundir);
5313
5314 ret = mkdir(rundir, S_IRWXU);
5315 if (ret < 0) {
5316 if (errno != EEXIST) {
5317 ERR("Unable to create %s", rundir);
5318 goto error;
5319 } else {
5320 ret = 0;
5321 }
5322 }
5323
5324 error:
5325 return ret;
5326 }
5327
5328 /*
5329 * Setup sockets and directory needed by the kconsumerd communication with the
5330 * session daemon.
5331 */
5332 static int set_consumer_sockets(struct consumer_data *consumer_data,
5333 const char *rundir)
5334 {
5335 int ret;
5336 char path[PATH_MAX];
5337
5338 switch (consumer_data->type) {
5339 case LTTNG_CONSUMER_KERNEL:
5340 snprintf(path, PATH_MAX, DEFAULT_KCONSUMERD_PATH, rundir);
5341 break;
5342 case LTTNG_CONSUMER64_UST:
5343 snprintf(path, PATH_MAX, DEFAULT_USTCONSUMERD64_PATH, rundir);
5344 break;
5345 case LTTNG_CONSUMER32_UST:
5346 snprintf(path, PATH_MAX, DEFAULT_USTCONSUMERD32_PATH, rundir);
5347 break;
5348 default:
5349 ERR("Consumer type unknown");
5350 ret = -EINVAL;
5351 goto error;
5352 }
5353
5354 DBG2("Creating consumer directory: %s", path);
5355
5356 ret = mkdir(path, S_IRWXU | S_IRGRP | S_IXGRP);
5357 if (ret < 0) {
5358 if (errno != EEXIST) {
5359 PERROR("mkdir");
5360 ERR("Failed to create %s", path);
5361 goto error;
5362 }
5363 ret = -1;
5364 }
5365 if (is_root) {
5366 ret = chown(path, 0, utils_get_group_id(tracing_group_name));
5367 if (ret < 0) {
5368 ERR("Unable to set group on %s", path);
5369 PERROR("chown");
5370 goto error;
5371 }
5372 }
5373
5374 /* Create the kconsumerd error unix socket */
5375 consumer_data->err_sock =
5376 lttcomm_create_unix_sock(consumer_data->err_unix_sock_path);
5377 if (consumer_data->err_sock < 0) {
5378 ERR("Create unix sock failed: %s", consumer_data->err_unix_sock_path);
5379 ret = -1;
5380 goto error;
5381 }
5382
5383 /*
5384 * Set the CLOEXEC flag. Return code is useless because either way, the
5385 * show must go on.
5386 */
5387 ret = utils_set_fd_cloexec(consumer_data->err_sock);
5388 if (ret < 0) {
5389 PERROR("utils_set_fd_cloexec");
5390 /* continue anyway */
5391 }
5392
5393 /* File permission MUST be 660 */
5394 ret = chmod(consumer_data->err_unix_sock_path,
5395 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
5396 if (ret < 0) {
5397 ERR("Set file permissions failed: %s", consumer_data->err_unix_sock_path);
5398 PERROR("chmod");
5399 goto error;
5400 }
5401
5402 error:
5403 return ret;
5404 }
5405
5406 /*
5407 * Signal handler for the daemon
5408 *
5409 * Simply stop all worker threads, leaving main() return gracefully after
5410 * joining all threads and calling cleanup().
5411 */
5412 static void sighandler(int sig)
5413 {
5414 switch (sig) {
5415 case SIGPIPE:
5416 DBG("SIGPIPE caught");
5417 return;
5418 case SIGINT:
5419 DBG("SIGINT caught");
5420 stop_threads();
5421 break;
5422 case SIGTERM:
5423 DBG("SIGTERM caught");
5424 stop_threads();
5425 break;
5426 case SIGUSR1:
5427 CMM_STORE_SHARED(recv_child_signal, 1);
5428 break;
5429 default:
5430 break;
5431 }
5432 }
5433
5434 /*
5435 * Setup signal handler for :
5436 * SIGINT, SIGTERM, SIGPIPE
5437 */
5438 static int set_signal_handler(void)
5439 {
5440 int ret = 0;
5441 struct sigaction sa;
5442 sigset_t sigset;
5443
5444 if ((ret = sigemptyset(&sigset)) < 0) {
5445 PERROR("sigemptyset");
5446 return ret;
5447 }
5448
5449 sa.sa_handler = sighandler;
5450 sa.sa_mask = sigset;
5451 sa.sa_flags = 0;
5452 if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) {
5453 PERROR("sigaction");
5454 return ret;
5455 }
5456
5457 if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) {
5458 PERROR("sigaction");
5459 return ret;
5460 }
5461
5462 if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) {
5463 PERROR("sigaction");
5464 return ret;
5465 }
5466
5467 if ((ret = sigaction(SIGUSR1, &sa, NULL)) < 0) {
5468 PERROR("sigaction");
5469 return ret;
5470 }
5471
5472 DBG("Signal handler set for SIGTERM, SIGUSR1, SIGPIPE and SIGINT");
5473
5474 return ret;
5475 }
5476
5477 /*
5478 * Set open files limit to unlimited. This daemon can open a large number of
5479 * file descriptors in order to consumer multiple kernel traces.
5480 */
5481 static void set_ulimit(void)
5482 {
5483 int ret;
5484 struct rlimit lim;
5485
5486 /* The kernel does not allowed an infinite limit for open files */
5487 lim.rlim_cur = 65535;
5488 lim.rlim_max = 65535;
5489
5490 ret = setrlimit(RLIMIT_NOFILE, &lim);
5491 if (ret < 0) {
5492 PERROR("failed to set open files limit");
5493 }
5494 }
5495
5496 /*
5497 * Write pidfile using the rundir and opt_pidfile.
5498 */
5499 static int write_pidfile(void)
5500 {
5501 int ret;
5502 char pidfile_path[PATH_MAX];
5503
5504 assert(rundir);
5505
5506 if (opt_pidfile) {
5507 if (lttng_strncpy(pidfile_path, opt_pidfile, sizeof(pidfile_path))) {
5508 ret = -1;
5509 goto error;
5510 }
5511 } else {
5512 /* Build pidfile path from rundir and opt_pidfile. */
5513 ret = snprintf(pidfile_path, sizeof(pidfile_path), "%s/"
5514 DEFAULT_LTTNG_SESSIOND_PIDFILE, rundir);
5515 if (ret < 0) {
5516 PERROR("snprintf pidfile path");
5517 goto error;
5518 }
5519 }
5520
5521 /*
5522 * Create pid file in rundir.
5523 */
5524 ret = utils_create_pid_file(getpid(), pidfile_path);
5525 error:
5526 return ret;
5527 }
5528
5529 /*
5530 * Create lockfile using the rundir and return its fd.
5531 */
5532 static int create_lockfile(void)
5533 {
5534 int ret;
5535 char lockfile_path[PATH_MAX];
5536
5537 ret = generate_lock_file_path(lockfile_path, sizeof(lockfile_path));
5538 if (ret < 0) {
5539 goto error;
5540 }
5541
5542 ret = utils_create_lock_file(lockfile_path);
5543 error:
5544 return ret;
5545 }
5546
5547 /*
5548 * Write agent TCP port using the rundir.
5549 */
5550 static int write_agent_port(void)
5551 {
5552 int ret;
5553 char path[PATH_MAX];
5554
5555 assert(rundir);
5556
5557 ret = snprintf(path, sizeof(path), "%s/"
5558 DEFAULT_LTTNG_SESSIOND_AGENTPORT_FILE, rundir);
5559 if (ret < 0) {
5560 PERROR("snprintf agent port path");
5561 goto error;
5562 }
5563
5564 /*
5565 * Create TCP agent port file in rundir.
5566 */
5567 ret = utils_create_pid_file(agent_tcp_port, path);
5568
5569 error:
5570 return ret;
5571 }
5572
5573 /*
5574 * main
5575 */
5576 int main(int argc, char **argv)
5577 {
5578 int ret = 0, retval = 0;
5579 void *status;
5580 const char *home_path, *env_app_timeout;
5581
5582 init_kernel_workarounds();
5583
5584 rcu_register_thread();
5585
5586 if (set_signal_handler()) {
5587 retval = -1;
5588 goto exit_set_signal_handler;
5589 }
5590
5591 setup_consumerd_path();
5592
5593 page_size = sysconf(_SC_PAGESIZE);
5594 if (page_size < 0) {
5595 PERROR("sysconf _SC_PAGESIZE");
5596 page_size = LONG_MAX;
5597 WARN("Fallback page size to %ld", page_size);
5598 }
5599
5600 /*
5601 * Parse arguments and load the daemon configuration file.
5602 *
5603 * We have an exit_options exit path to free memory reserved by
5604 * set_options. This is needed because the rest of sessiond_cleanup()
5605 * depends on ht_cleanup_thread, which depends on lttng_daemonize, which
5606 * depends on set_options.
5607 */
5608 progname = argv[0];
5609 if (set_options(argc, argv)) {
5610 retval = -1;
5611 goto exit_options;
5612 }
5613
5614 /* Daemonize */
5615 if (opt_daemon || opt_background) {
5616 int i;
5617
5618 ret = lttng_daemonize(&child_ppid, &recv_child_signal,
5619 !opt_background);
5620 if (ret < 0) {
5621 retval = -1;
5622 goto exit_options;
5623 }
5624
5625 /*
5626 * We are in the child. Make sure all other file descriptors are
5627 * closed, in case we are called with more opened file
5628 * descriptors than the standard ones.
5629 */
5630 for (i = 3; i < sysconf(_SC_OPEN_MAX); i++) {
5631 (void) close(i);
5632 }
5633 }
5634
5635 if (run_as_create_worker(argv[0]) < 0) {
5636 goto exit_create_run_as_worker_cleanup;
5637 }
5638
5639 /*
5640 * Starting from here, we can create threads. This needs to be after
5641 * lttng_daemonize due to RCU.
5642 */
5643
5644 /*
5645 * Initialize the health check subsystem. This call should set the
5646 * appropriate time values.
5647 */
5648 health_sessiond = health_app_create(NR_HEALTH_SESSIOND_TYPES);
5649 if (!health_sessiond) {
5650 PERROR("health_app_create error");
5651 retval = -1;
5652 goto exit_health_sessiond_cleanup;
5653 }
5654
5655 if (init_ht_cleanup_quit_pipe()) {
5656 retval = -1;
5657 goto exit_ht_cleanup_quit_pipe;
5658 }
5659
5660 /* Setup the thread ht_cleanup communication pipe. */
5661 if (utils_create_pipe_cloexec(ht_cleanup_pipe)) {
5662 retval = -1;
5663 goto exit_ht_cleanup_pipe;
5664 }
5665
5666 /* Set up max poll set size */
5667 if (lttng_poll_set_max_size()) {
5668 retval = -1;
5669 goto exit_set_max_size;
5670 }
5671
5672 /* Create thread to clean up RCU hash tables */
5673 ret = pthread_create(&ht_cleanup_thread, NULL,
5674 thread_ht_cleanup, (void *) NULL);
5675 if (ret) {
5676 errno = ret;
5677 PERROR("pthread_create ht_cleanup");
5678 retval = -1;
5679 goto exit_ht_cleanup;
5680 }
5681
5682 /* Create thread quit pipe */
5683 if (init_thread_quit_pipe()) {
5684 retval = -1;
5685 goto exit_init_data;
5686 }
5687
5688 /* Check if daemon is UID = 0 */
5689 is_root = !getuid();
5690
5691 if (is_root) {
5692 rundir = strdup(DEFAULT_LTTNG_RUNDIR);
5693 if (!rundir) {
5694 retval = -1;
5695 goto exit_init_data;
5696 }
5697
5698 /* Create global run dir with root access */
5699 if (create_lttng_rundir(rundir)) {
5700 retval = -1;
5701 goto exit_init_data;
5702 }
5703
5704 if (strlen(apps_unix_sock_path) == 0) {
5705 ret = snprintf(apps_unix_sock_path, PATH_MAX,
5706 DEFAULT_GLOBAL_APPS_UNIX_SOCK);
5707 if (ret < 0) {
5708 retval = -1;
5709 goto exit_init_data;
5710 }
5711 }
5712
5713 if (strlen(client_unix_sock_path) == 0) {
5714 ret = snprintf(client_unix_sock_path, PATH_MAX,
5715 DEFAULT_GLOBAL_CLIENT_UNIX_SOCK);
5716 if (ret < 0) {
5717 retval = -1;
5718 goto exit_init_data;
5719 }
5720 }
5721
5722 /* Set global SHM for ust */
5723 if (strlen(wait_shm_path) == 0) {
5724 ret = snprintf(wait_shm_path, PATH_MAX,
5725 DEFAULT_GLOBAL_APPS_WAIT_SHM_PATH);
5726 if (ret < 0) {
5727 retval = -1;
5728 goto exit_init_data;
5729 }
5730 }
5731
5732 if (strlen(health_unix_sock_path) == 0) {
5733 ret = snprintf(health_unix_sock_path,
5734 sizeof(health_unix_sock_path),
5735 DEFAULT_GLOBAL_HEALTH_UNIX_SOCK);
5736 if (ret < 0) {
5737 retval = -1;
5738 goto exit_init_data;
5739 }
5740 }
5741
5742 /* Setup kernel consumerd path */
5743 ret = snprintf(kconsumer_data.err_unix_sock_path, PATH_MAX,
5744 DEFAULT_KCONSUMERD_ERR_SOCK_PATH, rundir);
5745 if (ret < 0) {
5746 retval = -1;
5747 goto exit_init_data;
5748 }
5749 ret = snprintf(kconsumer_data.cmd_unix_sock_path, PATH_MAX,
5750 DEFAULT_KCONSUMERD_CMD_SOCK_PATH, rundir);
5751 if (ret < 0) {
5752 retval = -1;
5753 goto exit_init_data;
5754 }
5755
5756 DBG2("Kernel consumer err path: %s",
5757 kconsumer_data.err_unix_sock_path);
5758 DBG2("Kernel consumer cmd path: %s",
5759 kconsumer_data.cmd_unix_sock_path);
5760 } else {
5761 home_path = utils_get_home_dir();
5762 if (home_path == NULL) {
5763 /* TODO: Add --socket PATH option */
5764 ERR("Can't get HOME directory for sockets creation.");
5765 retval = -1;
5766 goto exit_init_data;
5767 }
5768
5769 /*
5770 * Create rundir from home path. This will create something like
5771 * $HOME/.lttng
5772 */
5773 ret = asprintf(&rundir, DEFAULT_LTTNG_HOME_RUNDIR, home_path);
5774 if (ret < 0) {
5775 retval = -1;
5776 goto exit_init_data;
5777 }
5778
5779 if (create_lttng_rundir(rundir)) {
5780 retval = -1;
5781 goto exit_init_data;
5782 }
5783
5784 if (strlen(apps_unix_sock_path) == 0) {
5785 ret = snprintf(apps_unix_sock_path, PATH_MAX,
5786 DEFAULT_HOME_APPS_UNIX_SOCK,
5787 home_path);
5788 if (ret < 0) {
5789 retval = -1;
5790 goto exit_init_data;
5791 }
5792 }
5793
5794 /* Set the cli tool unix socket path */
5795 if (strlen(client_unix_sock_path) == 0) {
5796 ret = snprintf(client_unix_sock_path, PATH_MAX,
5797 DEFAULT_HOME_CLIENT_UNIX_SOCK,
5798 home_path);
5799 if (ret < 0) {
5800 retval = -1;
5801 goto exit_init_data;
5802 }
5803 }
5804
5805 /* Set global SHM for ust */
5806 if (strlen(wait_shm_path) == 0) {
5807 ret = snprintf(wait_shm_path, PATH_MAX,
5808 DEFAULT_HOME_APPS_WAIT_SHM_PATH,
5809 getuid());
5810 if (ret < 0) {
5811 retval = -1;
5812 goto exit_init_data;
5813 }
5814 }
5815
5816 /* Set health check Unix path */
5817 if (strlen(health_unix_sock_path) == 0) {
5818 ret = snprintf(health_unix_sock_path,
5819 sizeof(health_unix_sock_path),
5820 DEFAULT_HOME_HEALTH_UNIX_SOCK,
5821 home_path);
5822 if (ret < 0) {
5823 retval = -1;
5824 goto exit_init_data;
5825 }
5826 }
5827 }
5828
5829 lockfile_fd = create_lockfile();
5830 if (lockfile_fd < 0) {
5831 retval = -1;
5832 goto exit_init_data;
5833 }
5834
5835 /* Set consumer initial state */
5836 kernel_consumerd_state = CONSUMER_STOPPED;
5837 ust_consumerd_state = CONSUMER_STOPPED;
5838
5839 DBG("Client socket path %s", client_unix_sock_path);
5840 DBG("Application socket path %s", apps_unix_sock_path);
5841 DBG("Application wait path %s", wait_shm_path);
5842 DBG("LTTng run directory path: %s", rundir);
5843
5844 /* 32 bits consumerd path setup */
5845 ret = snprintf(ustconsumer32_data.err_unix_sock_path, PATH_MAX,
5846 DEFAULT_USTCONSUMERD32_ERR_SOCK_PATH, rundir);
5847 if (ret < 0) {
5848 PERROR("snprintf 32-bit consumer error socket path");
5849 retval = -1;
5850 goto exit_init_data;
5851 }
5852 ret = snprintf(ustconsumer32_data.cmd_unix_sock_path, PATH_MAX,
5853 DEFAULT_USTCONSUMERD32_CMD_SOCK_PATH, rundir);
5854 if (ret < 0) {
5855 PERROR("snprintf 32-bit consumer command socket path");
5856 retval = -1;
5857 goto exit_init_data;
5858 }
5859
5860 DBG2("UST consumer 32 bits err path: %s",
5861 ustconsumer32_data.err_unix_sock_path);
5862 DBG2("UST consumer 32 bits cmd path: %s",
5863 ustconsumer32_data.cmd_unix_sock_path);
5864
5865 /* 64 bits consumerd path setup */
5866 ret = snprintf(ustconsumer64_data.err_unix_sock_path, PATH_MAX,
5867 DEFAULT_USTCONSUMERD64_ERR_SOCK_PATH, rundir);
5868 if (ret < 0) {
5869 PERROR("snprintf 64-bit consumer error socket path");
5870 retval = -1;
5871 goto exit_init_data;
5872 }
5873 ret = snprintf(ustconsumer64_data.cmd_unix_sock_path, PATH_MAX,
5874 DEFAULT_USTCONSUMERD64_CMD_SOCK_PATH, rundir);
5875 if (ret < 0) {
5876 PERROR("snprintf 64-bit consumer command socket path");
5877 retval = -1;
5878 goto exit_init_data;
5879 }
5880
5881 DBG2("UST consumer 64 bits err path: %s",
5882 ustconsumer64_data.err_unix_sock_path);
5883 DBG2("UST consumer 64 bits cmd path: %s",
5884 ustconsumer64_data.cmd_unix_sock_path);
5885
5886 /*
5887 * See if daemon already exist.
5888 */
5889 if (check_existing_daemon()) {
5890 ERR("Already running daemon.\n");
5891 /*
5892 * We do not goto exit because we must not cleanup()
5893 * because a daemon is already running.
5894 */
5895 retval = -1;
5896 goto exit_init_data;
5897 }
5898
5899 /*
5900 * Init UST app hash table. Alloc hash table before this point since
5901 * cleanup() can get called after that point.
5902 */
5903 if (ust_app_ht_alloc()) {
5904 ERR("Failed to allocate UST app hash table");
5905 retval = -1;
5906 goto exit_init_data;
5907 }
5908
5909 /*
5910 * Initialize agent app hash table. We allocate the hash table here
5911 * since cleanup() can get called after this point.
5912 */
5913 if (agent_app_ht_alloc()) {
5914 ERR("Failed to allocate Agent app hash table");
5915 retval = -1;
5916 goto exit_init_data;
5917 }
5918
5919 /*
5920 * These actions must be executed as root. We do that *after* setting up
5921 * the sockets path because we MUST make the check for another daemon using
5922 * those paths *before* trying to set the kernel consumer sockets and init
5923 * kernel tracer.
5924 */
5925 if (is_root) {
5926 if (set_consumer_sockets(&kconsumer_data, rundir)) {
5927 retval = -1;
5928 goto exit_init_data;
5929 }
5930
5931 /* Setup kernel tracer */
5932 if (!opt_no_kernel) {
5933 init_kernel_tracer();
5934 if (kernel_tracer_fd >= 0) {
5935 ret = syscall_init_table();
5936 if (ret < 0) {
5937 ERR("Unable to populate syscall table. "
5938 "Syscall tracing won't work "
5939 "for this session daemon.");
5940 }
5941 }
5942 }
5943
5944 /* Set ulimit for open files */
5945 set_ulimit();
5946 }
5947 /* init lttng_fd tracking must be done after set_ulimit. */
5948 lttng_fd_init();
5949
5950 if (set_consumer_sockets(&ustconsumer64_data, rundir)) {
5951 retval = -1;
5952 goto exit_init_data;
5953 }
5954
5955 if (set_consumer_sockets(&ustconsumer32_data, rundir)) {
5956 retval = -1;
5957 goto exit_init_data;
5958 }
5959
5960 /* Setup the needed unix socket */
5961 if (init_daemon_socket()) {
5962 retval = -1;
5963 goto exit_init_data;
5964 }
5965
5966 /* Set credentials to socket */
5967 if (is_root && set_permissions(rundir)) {
5968 retval = -1;
5969 goto exit_init_data;
5970 }
5971
5972 /* Get parent pid if -S, --sig-parent is specified. */
5973 if (opt_sig_parent) {
5974 ppid = getppid();
5975 }
5976
5977 /* Setup the kernel pipe for waking up the kernel thread */
5978 if (is_root && !opt_no_kernel) {
5979 if (utils_create_pipe_cloexec(kernel_poll_pipe)) {
5980 retval = -1;
5981 goto exit_init_data;
5982 }
5983 }
5984
5985 /* Setup the thread apps communication pipe. */
5986 if (utils_create_pipe_cloexec(apps_cmd_pipe)) {
5987 retval = -1;
5988 goto exit_init_data;
5989 }
5990
5991 /* Setup the thread apps notify communication pipe. */
5992 if (utils_create_pipe_cloexec(apps_cmd_notify_pipe)) {
5993 retval = -1;
5994 goto exit_init_data;
5995 }
5996
5997 /* Initialize global buffer per UID and PID registry. */
5998 buffer_reg_init_uid_registry();
5999 buffer_reg_init_pid_registry();
6000
6001 /* Init UST command queue. */
6002 cds_wfcq_init(&ust_cmd_queue.head, &ust_cmd_queue.tail);
6003
6004 /*
6005 * Get session list pointer. This pointer MUST NOT be free'd. This list
6006 * is statically declared in session.c
6007 */
6008 session_list_ptr = session_get_list();
6009
6010 cmd_init();
6011
6012 /* Check for the application socket timeout env variable. */
6013 env_app_timeout = getenv(DEFAULT_APP_SOCKET_TIMEOUT_ENV);
6014 if (env_app_timeout) {
6015 app_socket_timeout = atoi(env_app_timeout);
6016 } else {
6017 app_socket_timeout = DEFAULT_APP_SOCKET_RW_TIMEOUT;
6018 }
6019
6020 ret = write_pidfile();
6021 if (ret) {
6022 ERR("Error in write_pidfile");
6023 retval = -1;
6024 goto exit_init_data;
6025 }
6026 ret = write_agent_port();
6027 if (ret) {
6028 ERR("Error in write_agent_port");
6029 retval = -1;
6030 goto exit_init_data;
6031 }
6032
6033 /* Initialize communication library */
6034 lttcomm_init();
6035 /* Initialize TCP timeout values */
6036 lttcomm_inet_init();
6037
6038 if (load_session_init_data(&load_info) < 0) {
6039 retval = -1;
6040 goto exit_init_data;
6041 }
6042 load_info->path = opt_load_session_path;
6043
6044 /* Create health-check thread */
6045 ret = pthread_create(&health_thread, NULL,
6046 thread_manage_health, (void *) NULL);
6047 if (ret) {
6048 errno = ret;
6049 PERROR("pthread_create health");
6050 retval = -1;
6051 goto exit_health;
6052 }
6053
6054 /* Create thread to manage the client socket */
6055 ret = pthread_create(&client_thread, NULL,
6056 thread_manage_clients, (void *) NULL);
6057 if (ret) {
6058 errno = ret;
6059 PERROR("pthread_create clients");
6060 retval = -1;
6061 goto exit_client;
6062 }
6063
6064 /* Create thread to dispatch registration */
6065 ret = pthread_create(&dispatch_thread, NULL,
6066 thread_dispatch_ust_registration, (void *) NULL);
6067 if (ret) {
6068 errno = ret;
6069 PERROR("pthread_create dispatch");
6070 retval = -1;
6071 goto exit_dispatch;
6072 }
6073
6074 /* Create thread to manage application registration. */
6075 ret = pthread_create(&reg_apps_thread, NULL,
6076 thread_registration_apps, (void *) NULL);
6077 if (ret) {
6078 errno = ret;
6079 PERROR("pthread_create registration");
6080 retval = -1;
6081 goto exit_reg_apps;
6082 }
6083
6084 /* Create thread to manage application socket */
6085 ret = pthread_create(&apps_thread, NULL,
6086 thread_manage_apps, (void *) NULL);
6087 if (ret) {
6088 errno = ret;
6089 PERROR("pthread_create apps");
6090 retval = -1;
6091 goto exit_apps;
6092 }
6093
6094 /* Create thread to manage application notify socket */
6095 ret = pthread_create(&apps_notify_thread, NULL,
6096 ust_thread_manage_notify, (void *) NULL);
6097 if (ret) {
6098 errno = ret;
6099 PERROR("pthread_create notify");
6100 retval = -1;
6101 goto exit_apps_notify;
6102 }
6103
6104 /* Create agent registration thread. */
6105 ret = pthread_create(&agent_reg_thread, NULL,
6106 agent_thread_manage_registration, (void *) NULL);
6107 if (ret) {
6108 errno = ret;
6109 PERROR("pthread_create agent");
6110 retval = -1;
6111 goto exit_agent_reg;
6112 }
6113
6114 /* Don't start this thread if kernel tracing is not requested nor root */
6115 if (is_root && !opt_no_kernel) {
6116 /* Create kernel thread to manage kernel event */
6117 ret = pthread_create(&kernel_thread, NULL,
6118 thread_manage_kernel, (void *) NULL);
6119 if (ret) {
6120 errno = ret;
6121 PERROR("pthread_create kernel");
6122 retval = -1;
6123 goto exit_kernel;
6124 }
6125 }
6126
6127 /* Create session loading thread. */
6128 ret = pthread_create(&load_session_thread, NULL, thread_load_session,
6129 load_info);
6130 if (ret) {
6131 errno = ret;
6132 PERROR("pthread_create load_session_thread");
6133 retval = -1;
6134 goto exit_load_session;
6135 }
6136
6137 /*
6138 * This is where we start awaiting program completion (e.g. through
6139 * signal that asks threads to teardown).
6140 */
6141
6142 ret = pthread_join(load_session_thread, &status);
6143 if (ret) {
6144 errno = ret;
6145 PERROR("pthread_join load_session_thread");
6146 retval = -1;
6147 }
6148 exit_load_session:
6149
6150 if (is_root && !opt_no_kernel) {
6151 ret = pthread_join(kernel_thread, &status);
6152 if (ret) {
6153 errno = ret;
6154 PERROR("pthread_join");
6155 retval = -1;
6156 }
6157 }
6158 exit_kernel:
6159
6160 ret = pthread_join(agent_reg_thread, &status);
6161 if (ret) {
6162 errno = ret;
6163 PERROR("pthread_join agent");
6164 retval = -1;
6165 }
6166 exit_agent_reg:
6167
6168 ret = pthread_join(apps_notify_thread, &status);
6169 if (ret) {
6170 errno = ret;
6171 PERROR("pthread_join apps notify");
6172 retval = -1;
6173 }
6174 exit_apps_notify:
6175
6176 ret = pthread_join(apps_thread, &status);
6177 if (ret) {
6178 errno = ret;
6179 PERROR("pthread_join apps");
6180 retval = -1;
6181 }
6182 exit_apps:
6183
6184 ret = pthread_join(reg_apps_thread, &status);
6185 if (ret) {
6186 errno = ret;
6187 PERROR("pthread_join");
6188 retval = -1;
6189 }
6190 exit_reg_apps:
6191
6192 /*
6193 * Join dispatch thread after joining reg_apps_thread to ensure
6194 * we don't leak applications in the queue.
6195 */
6196 ret = pthread_join(dispatch_thread, &status);
6197 if (ret) {
6198 errno = ret;
6199 PERROR("pthread_join");
6200 retval = -1;
6201 }
6202 exit_dispatch:
6203
6204 ret = pthread_join(client_thread, &status);
6205 if (ret) {
6206 errno = ret;
6207 PERROR("pthread_join");
6208 retval = -1;
6209 }
6210 exit_client:
6211
6212 ret = pthread_join(health_thread, &status);
6213 if (ret) {
6214 errno = ret;
6215 PERROR("pthread_join health thread");
6216 retval = -1;
6217 }
6218 exit_health:
6219
6220 exit_init_data:
6221 /*
6222 * sessiond_cleanup() is called when no other thread is running, except
6223 * the ht_cleanup thread, which is needed to destroy the hash tables.
6224 */
6225 rcu_thread_online();
6226 sessiond_cleanup();
6227 rcu_thread_offline();
6228 rcu_unregister_thread();
6229
6230 ret = notify_thread_pipe(ht_cleanup_quit_pipe[1]);
6231 if (ret < 0) {
6232 ERR("write error on ht_cleanup quit pipe");
6233 retval = -1;
6234 }
6235
6236 ret = pthread_join(ht_cleanup_thread, &status);
6237 if (ret) {
6238 errno = ret;
6239 PERROR("pthread_join ht cleanup thread");
6240 retval = -1;
6241 }
6242 exit_ht_cleanup:
6243 exit_set_max_size:
6244
6245 utils_close_pipe(ht_cleanup_pipe);
6246 exit_ht_cleanup_pipe:
6247
6248 /*
6249 * Close the ht_cleanup quit pipe.
6250 */
6251 utils_close_pipe(ht_cleanup_quit_pipe);
6252 exit_ht_cleanup_quit_pipe:
6253
6254 health_app_destroy(health_sessiond);
6255 exit_health_sessiond_cleanup:
6256 exit_create_run_as_worker_cleanup:
6257
6258 exit_options:
6259 /* Ensure all prior call_rcu are done. */
6260 rcu_barrier();
6261
6262 sessiond_cleanup_options();
6263
6264 exit_set_signal_handler:
6265
6266 if (!retval) {
6267 exit(EXIT_SUCCESS);
6268 } else {
6269 exit(EXIT_FAILURE);
6270 }
6271 }
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