Fix message argument type
[lttng-tools.git] / ltt-sessiond / main.c
CommitLineData
826d496d
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1/*
2 * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
fac6795d
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3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version 2
7 * of the License, or (at your option) any later version.
91d76f53 8 *
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9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
91d76f53 13 *
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14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
fac6795d
DG
17 */
18
19#define _GNU_SOURCE
20#include <fcntl.h>
21#include <getopt.h>
22#include <grp.h>
23#include <limits.h>
24#include <pthread.h>
8c0faa1d 25#include <semaphore.h>
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26#include <signal.h>
27#include <stdio.h>
28#include <stdlib.h>
29#include <string.h>
30#include <sys/ipc.h>
31#include <sys/shm.h>
32#include <sys/socket.h>
33#include <sys/stat.h>
34#include <sys/types.h>
35#include <unistd.h>
36
37#include <urcu/list.h> /* URCU list library (-lurcu) */
5b97ec60 38#include <lttng/lttng.h>
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39
40#include "liblttsessiondcomm.h"
41#include "ltt-sessiond.h"
75462a81 42#include "lttngerr.h"
20fe2104 43#include "kernel-ctl.h"
9e78d6ae 44#include "ust-ctl.h"
5b74c7b1 45#include "session.h"
91d76f53 46#include "traceable-app.h"
5dc18550 47#include "lttng-kconsumerd.h"
62d3069f 48#include "libustctl.h"
fac6795d 49
5e16da05
MD
50/*
51 * TODO:
52 * teardown: signal SIGTERM handler -> write into pipe. Threads waits
53 * with epoll on pipe and on other pipes/sockets for commands. Main
54 * simply waits on pthread join.
55 */
56
75462a81 57/* Const values */
686204ab 58const char default_home_dir[] = DEFAULT_HOME_DIR;
64a23ac4 59const char default_tracing_group[] = LTTNG_DEFAULT_TRACING_GROUP;
686204ab
MD
60const char default_ust_sock_dir[] = DEFAULT_UST_SOCK_DIR;
61const char default_global_apps_pipe[] = DEFAULT_GLOBAL_APPS_PIPE;
62
fac6795d 63/* Variables */
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64int opt_verbose; /* Not static for lttngerr.h */
65int opt_quiet; /* Not static for lttngerr.h */
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66const char *progname;
67const char *opt_tracing_group;
5b8719f5 68static int opt_sig_parent;
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69static int opt_daemon;
70static int is_root; /* Set to 1 if the daemon is running as root */
1d4b027a
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71static pid_t ppid; /* Parent PID for --sig-parent option */
72static pid_t kconsumerd_pid;
fac6795d 73
d6f42150
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74static char apps_unix_sock_path[PATH_MAX]; /* Global application Unix socket path */
75static char client_unix_sock_path[PATH_MAX]; /* Global client Unix socket path */
76static char kconsumerd_err_unix_sock_path[PATH_MAX]; /* kconsumerd error Unix socket path */
77static char kconsumerd_cmd_unix_sock_path[PATH_MAX]; /* kconsumerd command Unix socket path */
fac6795d 78
1d4b027a 79/* Sockets and FDs */
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80static int client_sock;
81static int apps_sock;
82static int kconsumerd_err_sock;
8c0faa1d 83static int kconsumerd_cmd_sock;
20fe2104 84static int kernel_tracer_fd;
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85
86/* Pthread, Mutexes and Semaphores */
8c0faa1d 87static pthread_t kconsumerd_thread;
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88static pthread_t apps_thread;
89static pthread_t client_thread;
8c0faa1d
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90static sem_t kconsumerd_sem;
91
1d4b027a 92static pthread_mutex_t kconsumerd_pid_mutex; /* Mutex to control kconsumerd pid assignation */
fac6795d 93
fac6795d 94/*
1d4b027a 95 * teardown_kernel_session
fac6795d 96 *
1d4b027a
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97 * Complete teardown of a kernel session. This free all data structure
98 * related to a kernel session and update counter.
fac6795d 99 */
1d4b027a 100static void teardown_kernel_session(struct ltt_session *session)
fac6795d 101{
1d4b027a
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102 if (session->kernel_session != NULL) {
103 DBG("Tearing down kernel session");
c363b55d 104 trace_destroy_kernel_session(session->kernel_session);
1d4b027a
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105 /* Extra precaution */
106 session->kernel_session = NULL;
107 /* Decrement session count */
108 session->kern_session_count--;
fac6795d 109 }
fac6795d
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110}
111
112/*
1d4b027a 113 * cleanup
fac6795d 114 *
1d4b027a 115 * Cleanup the daemon on exit
fac6795d 116 */
1d4b027a 117static void cleanup()
fac6795d 118{
1d4b027a
DG
119 int ret;
120 char *cmd;
121 struct ltt_session *sess;
fac6795d 122
1d4b027a 123 DBG("Cleaning up");
e07ae692 124
1d4b027a
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125 /* <fun> */
126 MSG("\n%c[%d;%dm*** assert failed *** ==> %c[%dm", 27,1,31,27,0);
127 MSG("%c[%d;%dmMatthew, BEET driven development works!%c[%dm",27,1,33,27,0);
128 /* </fun> */
fac6795d 129
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130 /* Stopping all threads */
131 DBG("Terminating all threads");
132 pthread_cancel(client_thread);
133 pthread_cancel(apps_thread);
134 if (kconsumerd_pid != 0) {
135 pthread_cancel(kconsumerd_thread);
5b8719f5
DG
136 }
137
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138 DBG("Unlinking all unix socket");
139 unlink(client_unix_sock_path);
140 unlink(apps_unix_sock_path);
141 unlink(kconsumerd_err_unix_sock_path);
fac6795d 142
1d4b027a
DG
143 DBG("Removing %s directory", LTTNG_RUNDIR);
144 ret = asprintf(&cmd, "rm -rf " LTTNG_RUNDIR);
145 if (ret < 0) {
146 ERR("asprintf failed. Something is really wrong!");
147 }
5461b305 148
1d4b027a
DG
149 /* Remove lttng run directory */
150 ret = system(cmd);
151 if (ret < 0) {
152 ERR("Unable to clean " LTTNG_RUNDIR);
153 }
5461b305 154
1d4b027a
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155 DBG("Cleaning up all session");
156 /* Cleanup ALL session */
157 cds_list_for_each_entry(sess, &ltt_session_list.head, list) {
158 teardown_kernel_session(sess);
159 // TODO complete session cleanup (including UST)
fac6795d
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160 }
161
1d4b027a 162 close(kernel_tracer_fd);
fac6795d
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163}
164
e065084a
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165/*
166 * send_unix_sock
167 *
168 * Send data on a unix socket using the liblttsessiondcomm API.
169 *
170 * Return lttcomm error code.
171 */
172static int send_unix_sock(int sock, void *buf, size_t len)
173{
174 /* Check valid length */
175 if (len <= 0) {
176 return -1;
177 }
178
179 return lttcomm_send_unix_sock(sock, buf, len);
180}
181
5461b305
DG
182/*
183 * clean_command_ctx
184 *
185 * Free memory of a command context structure.
186 */
187static void clean_command_ctx(struct command_ctx *cmd_ctx)
188{
189 DBG("Clean command context structure %p", cmd_ctx);
190 if (cmd_ctx) {
191 if (cmd_ctx->llm) {
192 free(cmd_ctx->llm);
193 }
194 if (cmd_ctx->lsm) {
195 free(cmd_ctx->lsm);
196 }
197 free(cmd_ctx);
198 cmd_ctx = NULL;
199 }
200}
201
fac6795d 202/*
471d1693 203 * ust_connect_app
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204 *
205 * Return a socket connected to the libust communication socket
206 * of the application identified by the pid.
379473d2
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207 *
208 * If the pid is not found in the traceable list,
209 * return -1 to indicate error.
fac6795d 210 */
471d1693 211static int ust_connect_app(pid_t pid)
fac6795d 212{
91d76f53
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213 int sock;
214 struct ltt_traceable_app *lta;
379473d2 215
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216 DBG("Connect to application pid %d", pid);
217
91d76f53
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218 lta = find_app_by_pid(pid);
219 if (lta == NULL) {
220 /* App not found */
7442b2ba 221 DBG("Application pid %d not found", pid);
379473d2
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222 return -1;
223 }
fac6795d 224
91d76f53 225 sock = ustctl_connect_pid(lta->pid);
fac6795d 226 if (sock < 0) {
62d3069f 227 ERR("Fail connecting to the PID %d", pid);
fac6795d
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228 }
229
230 return sock;
231}
232
233/*
234 * notify_apps
235 *
236 * Notify apps by writing 42 to a named pipe using name.
237 * Every applications waiting for a ltt-sessiond will be notified
238 * and re-register automatically to the session daemon.
239 *
240 * Return open or write error value.
241 */
242static int notify_apps(const char *name)
243{
244 int fd;
245 int ret = -1;
246
e07ae692
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247 DBG("Notify the global application pipe");
248
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249 /* Try opening the global pipe */
250 fd = open(name, O_WRONLY);
251 if (fd < 0) {
252 goto error;
253 }
254
255 /* Notify by writing on the pipe */
256 ret = write(fd, "42", 2);
257 if (ret < 0) {
258 perror("write");
259 }
260
261error:
262 return ret;
263}
264
e065084a 265/*
5461b305 266 * setup_lttng_msg
ca95a216 267 *
5461b305
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268 * Setup the outgoing data buffer for the response (llm) by allocating the
269 * right amount of memory and copying the original information from the lsm
270 * structure.
ca95a216
DG
271 *
272 * Return total size of the buffer pointed by buf.
273 */
5461b305 274static int setup_lttng_msg(struct command_ctx *cmd_ctx, size_t size)
ca95a216 275{
5461b305 276 int ret, buf_size, trace_name_size;
ca95a216 277
5461b305
DG
278 /*
279 * Check for the trace_name. If defined, it's part of the payload data of
280 * the llm structure.
281 */
282 trace_name_size = strlen(cmd_ctx->lsm->trace_name);
283 buf_size = trace_name_size + size;
284
285 cmd_ctx->llm = malloc(sizeof(struct lttcomm_lttng_msg) + buf_size);
286 if (cmd_ctx->llm == NULL) {
ca95a216 287 perror("malloc");
5461b305 288 ret = -ENOMEM;
ca95a216
DG
289 goto error;
290 }
291
5461b305
DG
292 /* Copy common data */
293 cmd_ctx->llm->cmd_type = cmd_ctx->lsm->cmd_type;
294 cmd_ctx->llm->pid = cmd_ctx->lsm->pid;
295 if (!uuid_is_null(cmd_ctx->lsm->session_uuid)) {
296 uuid_copy(cmd_ctx->llm->session_uuid, cmd_ctx->lsm->session_uuid);
297 }
298
299 cmd_ctx->llm->trace_name_offset = trace_name_size;
300 cmd_ctx->llm->data_size = size;
301 cmd_ctx->lttng_msg_size = sizeof(struct lttcomm_lttng_msg) + buf_size;
302
303 /* Copy trace name to the llm structure. Begining of the payload. */
304 memcpy(cmd_ctx->llm->payload, cmd_ctx->lsm->trace_name, trace_name_size);
ca95a216
DG
305
306 return buf_size;
307
308error:
309 return ret;
310}
311
1d4b027a
DG
312/*
313 * thread_manage_kconsumerd
314 *
315 * This thread manage the kconsumerd error sent
316 * back to the session daemon.
317 */
318static void *thread_manage_kconsumerd(void *data)
319{
320 int sock, ret;
321 enum lttcomm_return_code code;
322
323 DBG("[thread] Manage kconsumerd started");
324
325 ret = lttcomm_listen_unix_sock(kconsumerd_err_sock);
326 if (ret < 0) {
327 goto error;
328 }
329
330 sock = lttcomm_accept_unix_sock(kconsumerd_err_sock);
331 if (sock < 0) {
332 goto error;
333 }
334
712ea556 335 /* Getting status code from kconsumerd */
1d4b027a
DG
336 ret = lttcomm_recv_unix_sock(sock, &code, sizeof(enum lttcomm_return_code));
337 if (ret <= 0) {
338 goto error;
339 }
340
341 if (code == KCONSUMERD_COMMAND_SOCK_READY) {
342 kconsumerd_cmd_sock = lttcomm_connect_unix_sock(kconsumerd_cmd_unix_sock_path);
343 if (kconsumerd_cmd_sock < 0) {
712ea556 344 sem_post(&kconsumerd_sem);
1d4b027a
DG
345 perror("kconsumerd connect");
346 goto error;
347 }
348 /* Signal condition to tell that the kconsumerd is ready */
349 sem_post(&kconsumerd_sem);
350 DBG("Kconsumerd command socket ready");
351 } else {
6f61d021 352 DBG("Kconsumerd error when waiting for SOCK_READY : %s",
1d4b027a
DG
353 lttcomm_get_readable_code(-code));
354 goto error;
355 }
356
712ea556
DG
357 /* Wait for any kconsumerd error */
358 ret = lttcomm_recv_unix_sock(sock, &code, sizeof(enum lttcomm_return_code));
359 if (ret <= 0) {
360 ERR("Kconsumerd closed the command socket");
361 goto error;
6f61d021 362 }
1d4b027a 363
712ea556
DG
364 ERR("Kconsumerd return code : %s", lttcomm_get_readable_code(-code));
365
1d4b027a
DG
366error:
367 kconsumerd_pid = 0;
6f61d021 368 DBG("Kconsumerd thread dying");
1d4b027a
DG
369 return NULL;
370}
371
372/*
373 * thread_manage_apps
374 *
375 * This thread manage the application socket communication
376 */
377static void *thread_manage_apps(void *data)
378{
379 int sock, ret;
380
381 /* TODO: Something more elegant is needed but fine for now */
382 /* FIXME: change all types to either uint8_t, uint32_t, uint64_t
383 * for 32-bit vs 64-bit compat processes. */
384 /* replicate in ust with version number */
385 struct {
386 int reg; /* 1:register, 0:unregister */
387 pid_t pid;
388 uid_t uid;
389 } reg_msg;
390
391 DBG("[thread] Manage apps started");
392
393 ret = lttcomm_listen_unix_sock(apps_sock);
394 if (ret < 0) {
395 goto error;
396 }
397
398 /* Notify all applications to register */
399 notify_apps(default_global_apps_pipe);
400
401 while (1) {
402 DBG("Accepting application registration");
403 /* Blocking call, waiting for transmission */
404 sock = lttcomm_accept_unix_sock(apps_sock);
405 if (sock < 0) {
406 goto error;
407 }
408
409 /* Basic recv here to handle the very simple data
410 * that the libust send to register (reg_msg).
411 */
412 ret = recv(sock, &reg_msg, sizeof(reg_msg), 0);
413 if (ret < 0) {
414 perror("recv");
415 continue;
416 }
417
418 /* Add application to the global traceable list */
419 if (reg_msg.reg == 1) {
420 /* Registering */
421 ret = register_traceable_app(reg_msg.pid, reg_msg.uid);
422 if (ret < 0) {
423 /* register_traceable_app only return an error with
424 * ENOMEM. At this point, we better stop everything.
425 */
426 goto error;
427 }
428 } else {
429 /* Unregistering */
430 unregister_traceable_app(reg_msg.pid);
431 }
432 }
433
434error:
435
436 return NULL;
437}
438
8c0faa1d 439/*
693bd40b 440 * spawn_kconsumerd_thread
8c0faa1d
DG
441 *
442 * Start the thread_manage_kconsumerd. This must be done after a kconsumerd
443 * exec or it will fails.
444 */
693bd40b 445static int spawn_kconsumerd_thread(void)
8c0faa1d
DG
446{
447 int ret;
448
449 /* Setup semaphore */
450 sem_init(&kconsumerd_sem, 0, 0);
451
1d4b027a 452 ret = pthread_create(&kconsumerd_thread, NULL, thread_manage_kconsumerd, (void *) NULL);
8c0faa1d
DG
453 if (ret != 0) {
454 perror("pthread_create kconsumerd");
455 goto error;
456 }
457
693bd40b 458 /* Wait for the kconsumerd thread to be ready */
8c0faa1d
DG
459 sem_wait(&kconsumerd_sem);
460
712ea556
DG
461 if (kconsumerd_pid == 0) {
462 ERR("Kconsumerd did not start");
463 goto error;
464 }
465
8c0faa1d
DG
466 return 0;
467
468error:
712ea556 469 ret = LTTCOMM_KERN_CONSUMER_FAIL;
8c0faa1d
DG
470 return ret;
471}
472
473/*
693bd40b 474 * spawn_kconsumerd
8c0faa1d 475 *
693bd40b
DG
476 * Fork and exec a kernel consumer daemon (kconsumerd).
477 *
478 * NOTE: It is very important to fork a kconsumerd BEFORE opening any kernel
479 * file descriptor using the libkernelctl or kernel-ctl functions. So, a
480 * kernel consumer MUST only be spawned before creating a kernel session.
8c0faa1d
DG
481 *
482 * Return pid if successful else -1.
483 */
693bd40b 484static pid_t spawn_kconsumerd(void)
8c0faa1d
DG
485{
486 int ret;
487 pid_t pid;
488
c49dc785
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489 DBG("Spawning kconsumerd");
490
8c0faa1d
DG
491 pid = fork();
492 if (pid == 0) {
493 /*
494 * Exec kconsumerd.
495 */
f57244de 496 execlp("kconsumerd", "kconsumerd", "--verbose", NULL);
8c0faa1d
DG
497 if (errno != 0) {
498 perror("kernel start consumer exec");
499 }
500 exit(EXIT_FAILURE);
501 } else if (pid > 0) {
502 ret = pid;
503 goto error;
504 } else {
505 perror("kernel start consumer fork");
506 ret = -errno;
507 goto error;
508 }
509
510error:
511 return ret;
512}
513
693bd40b
DG
514/*
515 * start_kconsumerd
516 *
517 * Spawn the kconsumerd daemon and session daemon thread.
518 */
519static int start_kconsumerd(void)
520{
521 int ret;
522
693bd40b 523 pthread_mutex_lock(&kconsumerd_pid_mutex);
c49dc785
DG
524 if (kconsumerd_pid != 0) {
525 goto end;
526 }
693bd40b 527
c49dc785
DG
528 ret = spawn_kconsumerd();
529 if (ret < 0) {
530 ERR("Spawning kconsumerd failed");
531 ret = LTTCOMM_KERN_CONSUMER_FAIL;
532 pthread_mutex_unlock(&kconsumerd_pid_mutex);
533 goto error;
693bd40b 534 }
c49dc785
DG
535
536 /* Setting up the global kconsumerd_pid */
537 kconsumerd_pid = ret;
693bd40b
DG
538 pthread_mutex_unlock(&kconsumerd_pid_mutex);
539
6f61d021
DG
540 DBG("Kconsumerd pid %d", ret);
541
693bd40b 542 DBG("Spawning kconsumerd thread");
693bd40b
DG
543 ret = spawn_kconsumerd_thread();
544 if (ret < 0) {
545 ERR("Fatal error spawning kconsumerd thread");
693bd40b
DG
546 goto error;
547 }
548
c49dc785
DG
549end:
550 pthread_mutex_unlock(&kconsumerd_pid_mutex);
693bd40b
DG
551 return 0;
552
553error:
554 return ret;
555}
556
8c0faa1d
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557/*
558 * send_kconsumerd_fds
559 *
560 * Send all stream fds of the kernel session to the consumer.
561 */
562static int send_kconsumerd_fds(int sock, struct ltt_kernel_session *session)
563{
33a2b854
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564 int ret;
565 size_t nb_fd;
8c0faa1d
DG
566 struct ltt_kernel_stream *stream;
567 struct ltt_kernel_channel *chan;
568 struct lttcomm_kconsumerd_header lkh;
33a2b854 569 struct lttcomm_kconsumerd_msg lkm;
8c0faa1d 570
33a2b854 571 nb_fd = session->stream_count_global;
8c0faa1d
DG
572
573 /* Setup header */
33a2b854 574 lkh.payload_size = (nb_fd + 1) * sizeof(struct lttcomm_kconsumerd_msg);
5dc18550 575 lkh.cmd_type = ADD_STREAM;
8c0faa1d
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576
577 DBG("Sending kconsumerd header");
1d4b027a
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578
579 ret = lttcomm_send_unix_sock(sock, &lkh, sizeof(struct lttcomm_kconsumerd_header));
580 if (ret < 0) {
581 perror("send kconsumerd header");
582 goto error;
8c0faa1d
DG
583 }
584
33a2b854
DG
585 DBG("Sending metadata stream fd");
586
587 /* Send metadata stream fd first */
588 lkm.fd = session->metadata_stream_fd;
589 lkm.state = ACTIVE_FD;
590 lkm.max_sb_size = session->metadata->conf->subbuf_size;
591 strncpy(lkm.path_name, session->metadata->pathname, PATH_MAX);
8c0faa1d 592
33a2b854 593 ret = lttcomm_send_fds_unix_sock(sock, &lkm, &lkm.fd, 1, sizeof(lkm));
1d4b027a 594 if (ret < 0) {
33a2b854 595 perror("send kconsumerd fd");
1d4b027a
DG
596 goto error;
597 }
598
33a2b854
DG
599 cds_list_for_each_entry(chan, &session->channel_list.head, list) {
600 cds_list_for_each_entry(stream, &chan->stream_list.head, list) {
601 lkm.fd = stream->fd;
602 lkm.state = stream->state;
603 lkm.max_sb_size = chan->channel->subbuf_size;
604 strncpy(lkm.path_name, stream->pathname, PATH_MAX);
605
606 DBG("Sending fd %d to kconsumerd", lkm.fd);
607
608 ret = lttcomm_send_fds_unix_sock(sock, &lkm, &lkm.fd, 1, sizeof(lkm));
609 if (ret < 0) {
610 perror("send kconsumerd fd");
611 goto error;
612 }
613 }
614 }
615
1d4b027a
DG
616 DBG("Kconsumerd fds sent");
617
618 return 0;
619
620error:
621 return ret;
8c0faa1d
DG
622}
623
624/*
1d4b027a 625 * create_trace_dir
8c0faa1d 626 *
1d4b027a 627 * Create the trace output directory.
8c0faa1d 628 */
1d4b027a 629static int create_trace_dir(struct ltt_kernel_session *session)
8c0faa1d 630{
1d4b027a
DG
631 int ret;
632 struct ltt_kernel_channel *chan;
633
634 /* Create all channel directories */
635 cds_list_for_each_entry(chan, &session->channel_list.head, list) {
1b6083d9 636 DBG("Creating trace directory at %s", chan->pathname);
f7776ea7 637 // TODO: recursive create dir
1d4b027a
DG
638 ret = mkdir(chan->pathname, S_IRWXU | S_IRWXG );
639 if (ret < 0) {
6beb2242
DG
640 if (ret != EEXIST) {
641 perror("mkdir trace path");
642 ret = -errno;
643 goto error;
644 }
1d4b027a 645 }
8c0faa1d 646 }
1d4b027a
DG
647
648 return 0;
649
650error:
651 return ret;
8c0faa1d
DG
652}
653
333f285e
DG
654/*
655 * init_kernel_tracer
656 *
657 * Setup necessary data for kernel tracer action.
658 */
659static void init_kernel_tracer(void)
660{
661 /* Set the global kernel tracer fd */
662 kernel_tracer_fd = open(DEFAULT_KERNEL_TRACER_PATH, O_RDWR);
663 if (kernel_tracer_fd < 0) {
664 WARN("No kernel tracer available");
665 kernel_tracer_fd = 0;
666 }
667
668 DBG("Kernel tracer fd %d", kernel_tracer_fd);
669}
670
fac6795d
DG
671/*
672 * process_client_msg
673 *
5461b305
DG
674 * Process the command requested by the lttng client within the command
675 * context structure. This function make sure that the return structure (llm)
676 * is set and ready for transmission before returning.
fac6795d 677 *
e065084a 678 * Return any error encountered or 0 for success.
fac6795d 679 */
5461b305 680static int process_client_msg(struct command_ctx *cmd_ctx)
fac6795d 681{
5461b305 682 int ret;
fac6795d 683
5461b305 684 DBG("Processing client command %d", cmd_ctx->lsm->cmd_type);
fac6795d 685
379473d2 686 /* Check command that needs a session */
5461b305 687 switch (cmd_ctx->lsm->cmd_type) {
5e16da05
MD
688 case LTTNG_CREATE_SESSION:
689 case LTTNG_LIST_SESSIONS:
2ef84c95 690 case KERNEL_LIST_EVENTS:
5e16da05
MD
691 case UST_LIST_APPS:
692 break;
693 default:
5461b305
DG
694 cmd_ctx->session = find_session_by_uuid(cmd_ctx->lsm->session_uuid);
695 if (cmd_ctx->session == NULL) {
379473d2 696 ret = LTTCOMM_SELECT_SESS;
5461b305 697 goto error;
379473d2 698 }
5e16da05 699 break;
379473d2
DG
700 }
701
20fe2104
DG
702 /* Check command for kernel tracing */
703 switch (cmd_ctx->lsm->cmd_type) {
704 case KERNEL_CREATE_SESSION:
705 case KERNEL_CREATE_CHANNEL:
8c0faa1d 706 case KERNEL_CREATE_STREAM:
aaf26714
DG
707 case KERNEL_DISABLE_EVENT:
708 case KERNEL_ENABLE_EVENT:
2ef84c95 709 case KERNEL_LIST_EVENTS:
aaf26714
DG
710 case KERNEL_OPEN_METADATA:
711 case KERNEL_START_TRACE:
712 case KERNEL_STOP_TRACE:
333f285e 713 /* Kernel tracer check */
20fe2104 714 if (kernel_tracer_fd == 0) {
333f285e
DG
715 init_kernel_tracer();
716 if (kernel_tracer_fd == 0) {
717 ret = LTTCOMM_KERN_NA;
718 goto error;
719 }
20fe2104
DG
720 }
721 break;
722 }
723
471d1693 724 /* Connect to ust apps if available pid */
5461b305 725 if (cmd_ctx->lsm->pid > 0) {
471d1693 726 /* Connect to app using ustctl API */
5461b305
DG
727 cmd_ctx->ust_sock = ust_connect_app(cmd_ctx->lsm->pid);
728 if (cmd_ctx->ust_sock < 0) {
471d1693 729 ret = LTTCOMM_NO_TRACEABLE;
5461b305 730 goto error;
471d1693
DG
731 }
732 }
733
fac6795d 734 /* Process by command type */
5461b305 735 switch (cmd_ctx->lsm->cmd_type) {
20fe2104
DG
736 case KERNEL_CREATE_SESSION:
737 {
738 ret = setup_lttng_msg(cmd_ctx, 0);
739 if (ret < 0) {
740 goto setup_error;
741 }
742
693bd40b 743 ret = start_kconsumerd();
8c0faa1d 744 if (ret < 0) {
8c0faa1d
DG
745 goto error;
746 }
747
20fe2104
DG
748 DBG("Creating kernel session");
749
8c0faa1d 750 ret = kernel_create_session(cmd_ctx->session, kernel_tracer_fd);
20fe2104
DG
751 if (ret < 0) {
752 ret = LTTCOMM_KERN_SESS_FAIL;
753 goto error;
754 }
755
756 ret = LTTCOMM_OK;
757 break;
758 }
759 case KERNEL_CREATE_CHANNEL:
760 {
761 ret = setup_lttng_msg(cmd_ctx, 0);
762 if (ret < 0) {
763 goto setup_error;
764 }
765
8c0faa1d
DG
766 DBG("Creating kernel channel");
767
768 ret = kernel_create_channel(cmd_ctx->session->kernel_session);
20fe2104 769
20fe2104
DG
770 if (ret < 0) {
771 ret = LTTCOMM_KERN_CHAN_FAIL;
772 goto error;
773 }
774
775 ret = LTTCOMM_OK;
776 break;
777 }
894be886
DG
778 case KERNEL_ENABLE_EVENT:
779 {
780 /* Setup lttng message with no payload */
781 ret = setup_lttng_msg(cmd_ctx, 0);
782 if (ret < 0) {
783 goto setup_error;
784 }
785
786 DBG("Enabling kernel event %s", cmd_ctx->lsm->u.event.event_name);
787
8c0faa1d 788 ret = kernel_enable_event(cmd_ctx->session->kernel_session, cmd_ctx->lsm->u.event.event_name);
f34daff7
DG
789 if (ret < 0) {
790 ret = LTTCOMM_KERN_ENABLE_FAIL;
791 goto error;
792 }
793
894be886
DG
794 ret = LTTCOMM_OK;
795 break;
796 }
33a2b854
DG
797 case KERNEL_ENABLE_ALL_EVENT:
798 {
799 int pos, size;
800 char *event_list, *event, *ptr;
801
802 /* Setup lttng message with no payload */
803 ret = setup_lttng_msg(cmd_ctx, 0);
804 if (ret < 0) {
805 goto setup_error;
806 }
807
808 DBG("Enabling all kernel event");
809
810 size = kernel_list_events(kernel_tracer_fd, &event_list);
811 if (size < 0) {
812 ret = LTTCOMM_KERN_LIST_FAIL;
813 goto error;
814 }
815
816 ptr = event_list;
817 while ((size = sscanf(ptr, "event { name = %m[^;]; };%n\n", &event, &pos)) == 1) {
818 /* Enable each single event */
819 ret = kernel_enable_event(cmd_ctx->session->kernel_session, event);
820 if (ret < 0) {
821 ret = LTTCOMM_KERN_ENABLE_FAIL;
822 goto error;
823 }
824 /* Move pointer to the next line */
825 ptr += pos + 1;
826 free(event);
827 }
828
829 free(event_list);
830
831 ret = LTTCOMM_OK;
832 break;
833 }
2ef84c95
DG
834 case KERNEL_LIST_EVENTS:
835 {
836 char *event_list;
837 ssize_t size;
838
839 size = kernel_list_events(kernel_tracer_fd, &event_list);
840 if (size < 0) {
841 ret = LTTCOMM_KERN_LIST_FAIL;
842 goto error;
843 }
844
845 /*
846 * Setup lttng message with payload size set to the event list size in
847 * bytes and then copy list into the llm payload.
848 */
849 ret = setup_lttng_msg(cmd_ctx, size);
850 if (ret < 0) {
851 goto setup_error;
852 }
853
854 /* Copy event list into message payload */
855 memcpy(cmd_ctx->llm->payload, event_list, size);
856
857 free(event_list);
858
859 ret = LTTCOMM_OK;
860 break;
861 }
aaf26714
DG
862 case KERNEL_OPEN_METADATA:
863 {
864 /* Setup lttng message with no payload */
865 ret = setup_lttng_msg(cmd_ctx, 0);
866 if (ret < 0) {
867 goto setup_error;
868 }
869
870 DBG("Open kernel metadata");
871
872 ret = kernel_open_metadata(cmd_ctx->session->kernel_session);
873 if (ret < 0) {
874 ret = LTTCOMM_KERN_META_FAIL;
875 goto error;
876 }
877
878 ret = LTTCOMM_OK;
879 break;
880 }
8c0faa1d
DG
881 case KERNEL_CREATE_STREAM:
882 {
883 struct ltt_kernel_channel *chan;
884 /* Setup lttng message with no payload */
885 ret = setup_lttng_msg(cmd_ctx, 0);
886 if (ret < 0) {
887 goto setup_error;
888 }
889
890 DBG("Creating kernel stream");
891
892 ret = kernel_create_metadata_stream(cmd_ctx->session->kernel_session);
893 if (ret < 0) {
894 ERR("Kernel create metadata stream failed");
895 ret = LTTCOMM_KERN_STREAM_FAIL;
896 goto error;
897 }
898
899 /* For each channel */
900 cds_list_for_each_entry(chan, &cmd_ctx->session->kernel_session->channel_list.head, list) {
901 ret = kernel_create_channel_stream(chan);
902 if (ret < 0) {
903 ERR("Kernel create channel stream failed");
904 ret = LTTCOMM_KERN_STREAM_FAIL;
905 goto error;
906 }
907 /* Update the stream global counter */
908 cmd_ctx->session->kernel_session->stream_count_global += ret;
909 }
910
911 ret = LTTCOMM_OK;
912 break;
913 }
914 case KERNEL_START_TRACE:
915 {
916 /* Setup lttng message with no payload */
917 ret = setup_lttng_msg(cmd_ctx, 0);
918 if (ret < 0) {
919 goto setup_error;
920 }
921
922 DBG("Start kernel tracing");
923
924 ret = create_trace_dir(cmd_ctx->session->kernel_session);
925 if (ret < 0) {
926 if (ret == -EEXIST) {
927 ret = LTTCOMM_KERN_DIR_EXIST;
928 } else {
929 ret = LTTCOMM_KERN_DIR_FAIL;
930 goto error;
931 }
932 }
933
934 ret = kernel_start_session(cmd_ctx->session->kernel_session);
935 if (ret < 0) {
936 ERR("Kernel start session failed");
937 ret = LTTCOMM_KERN_START_FAIL;
938 goto error;
939 }
940
941 ret = send_kconsumerd_fds(kconsumerd_cmd_sock, cmd_ctx->session->kernel_session);
942 if (ret < 0) {
943 ERR("Send kconsumerd fds failed");
944 ret = LTTCOMM_KERN_CONSUMER_FAIL;
945 goto error;
946 }
947
948 ret = LTTCOMM_OK;
949 break;
950 }
951 case KERNEL_STOP_TRACE:
952 {
953 /* Setup lttng message with no payload */
954 ret = setup_lttng_msg(cmd_ctx, 0);
955 if (ret < 0) {
956 goto setup_error;
957 }
958
84291629
DG
959 if (cmd_ctx->session->kernel_session == NULL) {
960 ret = LTTCOMM_KERN_NO_SESSION;
961 goto error;
962 }
963
8c0faa1d
DG
964 DBG("Stop kernel tracing");
965
966 ret = kernel_stop_session(cmd_ctx->session->kernel_session);
967 if (ret < 0) {
968 ERR("Kernel stop session failed");
969 ret = LTTCOMM_KERN_STOP_FAIL;
970 goto error;
971 }
972
973 /* Clean kernel session teardown */
974 teardown_kernel_session(cmd_ctx->session);
975
976 ret = LTTCOMM_OK;
977 break;
978 }
5e16da05
MD
979 case LTTNG_CREATE_SESSION:
980 {
5461b305
DG
981 /* Setup lttng message with no payload */
982 ret = setup_lttng_msg(cmd_ctx, 0);
983 if (ret < 0) {
984 goto setup_error;
985 }
986
987 ret = create_session(cmd_ctx->lsm->session_name, &cmd_ctx->llm->session_uuid);
5e16da05
MD
988 if (ret < 0) {
989 if (ret == -1) {
990 ret = LTTCOMM_EXIST_SESS;
991 } else {
aaf97519 992 ret = LTTCOMM_FATAL;
aaf97519 993 }
5461b305 994 goto error;
8028d920 995 }
1657e9bb 996
5461b305 997 ret = LTTCOMM_OK;
5e16da05
MD
998 break;
999 }
1000 case LTTNG_DESTROY_SESSION:
1001 {
5461b305
DG
1002 /* Setup lttng message with no payload */
1003 ret = setup_lttng_msg(cmd_ctx, 0);
1004 if (ret < 0) {
1005 goto setup_error;
1006 }
1007
1008 ret = destroy_session(&cmd_ctx->lsm->session_uuid);
5e16da05
MD
1009 if (ret < 0) {
1010 ret = LTTCOMM_NO_SESS;
5461b305 1011 goto error;
5e16da05 1012 }
1657e9bb 1013
5461b305
DG
1014 ret = LTTCOMM_OK;
1015 break;
5e16da05
MD
1016 }
1017 case LTTNG_LIST_TRACES:
1018 {
5461b305 1019 unsigned int trace_count;
1657e9bb 1020
5461b305 1021 trace_count = get_trace_count_per_session(cmd_ctx->session);
5e16da05
MD
1022 if (trace_count == 0) {
1023 ret = LTTCOMM_NO_TRACE;
5461b305 1024 goto error;
1657e9bb 1025 }
df0da139 1026
5461b305
DG
1027 ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_trace) * trace_count);
1028 if (ret < 0) {
1029 goto setup_error;
df0da139 1030 }
ca95a216 1031
5461b305
DG
1032 get_traces_per_session(cmd_ctx->session,
1033 (struct lttng_trace *)(cmd_ctx->llm->payload));
1034
1035 ret = LTTCOMM_OK;
5e16da05
MD
1036 break;
1037 }
1038 case UST_CREATE_TRACE:
1039 {
5461b305
DG
1040 /* Setup lttng message with no payload */
1041 ret = setup_lttng_msg(cmd_ctx, 0);
5e16da05 1042 if (ret < 0) {
5461b305 1043 goto setup_error;
fac6795d 1044 }
ce3d728c 1045
5461b305
DG
1046 ret = ust_create_trace(cmd_ctx);
1047 if (ret < 0) {
1048 goto setup_error;
1049 }
1050 break;
5e16da05
MD
1051 }
1052 case UST_LIST_APPS:
1053 {
5461b305
DG
1054 unsigned int app_count;
1055
1056 app_count = get_app_count();
1057 DBG("Traceable application count : %d", app_count);
5e16da05
MD
1058 if (app_count == 0) {
1059 ret = LTTCOMM_NO_APPS;
5461b305 1060 goto error;
ce3d728c 1061 }
520ff687 1062
5461b305
DG
1063 ret = setup_lttng_msg(cmd_ctx, sizeof(pid_t) * app_count);
1064 if (ret < 0) {
1065 goto setup_error;
520ff687 1066 }
57167058 1067
5461b305 1068 get_app_list_pids((pid_t *)(cmd_ctx->llm->payload));
5e16da05 1069
5461b305 1070 ret = LTTCOMM_OK;
5e16da05
MD
1071 break;
1072 }
1073 case UST_START_TRACE:
1074 {
5461b305
DG
1075 /* Setup lttng message with no payload */
1076 ret = setup_lttng_msg(cmd_ctx, 0);
1077 if (ret < 0) {
1078 goto setup_error;
1079 }
ca95a216 1080
5461b305
DG
1081 ret = ust_start_trace(cmd_ctx);
1082 if (ret < 0) {
1083 goto setup_error;
1084 }
1085 break;
5e16da05
MD
1086 }
1087 case UST_STOP_TRACE:
1088 {
5461b305
DG
1089 /* Setup lttng message with no payload */
1090 ret = setup_lttng_msg(cmd_ctx, 0);
1091 if (ret < 0) {
1092 goto setup_error;
1093 }
ca95a216 1094
5461b305
DG
1095 ret = ust_stop_trace(cmd_ctx);
1096 if (ret < 0) {
1097 goto setup_error;
1098 }
1099 break;
5e16da05
MD
1100 }
1101 case LTTNG_LIST_SESSIONS:
1102 {
5461b305
DG
1103 unsigned int session_count;
1104
1105 session_count = get_session_count();
5e16da05
MD
1106 if (session_count == 0) {
1107 ret = LTTCOMM_NO_SESS;
5461b305 1108 goto error;
57167058 1109 }
5e16da05 1110
5461b305
DG
1111 ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_session) * session_count);
1112 if (ret < 0) {
1113 goto setup_error;
e065084a 1114 }
5e16da05 1115
5461b305 1116 get_lttng_session((struct lttng_session *)(cmd_ctx->llm->payload));
5e16da05 1117
5461b305 1118 ret = LTTCOMM_OK;
5e16da05
MD
1119 break;
1120 }
1121 default:
1122 /* Undefined command */
5461b305
DG
1123 ret = setup_lttng_msg(cmd_ctx, 0);
1124 if (ret < 0) {
1125 goto setup_error;
1126 }
1127
5e16da05 1128 ret = LTTCOMM_UND;
5461b305 1129 break;
fac6795d
DG
1130 }
1131
5461b305
DG
1132 /* Set return code */
1133 cmd_ctx->llm->ret_code = ret;
ca95a216 1134
e065084a
DG
1135 return ret;
1136
5461b305 1137error:
5461b305
DG
1138 if (cmd_ctx->llm == NULL) {
1139 DBG("Missing llm structure. Allocating one.");
894be886 1140 if (setup_lttng_msg(cmd_ctx, 0) < 0) {
5461b305
DG
1141 goto setup_error;
1142 }
1143 }
e065084a 1144 /* Notify client of error */
5461b305 1145 cmd_ctx->llm->ret_code = ret;
e065084a 1146
5461b305 1147setup_error:
8028d920 1148 return ret;
fac6795d
DG
1149}
1150
1d4b027a
DG
1151/*
1152 * thread_manage_clients
1153 *
1154 * This thread manage all clients request using the unix
1155 * client socket for communication.
1156 */
1157static void *thread_manage_clients(void *data)
1158{
1159 int sock, ret;
1160 struct command_ctx *cmd_ctx;
1161
1162 DBG("[thread] Manage client started");
1163
1164 ret = lttcomm_listen_unix_sock(client_sock);
1165 if (ret < 0) {
1166 goto error;
1167 }
1168
1169 /* Notify parent pid that we are ready
1170 * to accept command for client side.
1171 */
1172 if (opt_sig_parent) {
1173 kill(ppid, SIGCHLD);
1174 }
1175
1176 while (1) {
1177 /* Blocking call, waiting for transmission */
1178 DBG("Accepting client command ...");
1179 sock = lttcomm_accept_unix_sock(client_sock);
1180 if (sock < 0) {
1181 goto error;
1182 }
1183
1184 /* Allocate context command to process the client request */
1185 cmd_ctx = malloc(sizeof(struct command_ctx));
1186
1187 /* Allocate data buffer for reception */
1188 cmd_ctx->lsm = malloc(sizeof(struct lttcomm_session_msg));
1189 cmd_ctx->llm = NULL;
1190 cmd_ctx->session = NULL;
1191
1192 /*
1193 * Data is received from the lttng client. The struct
1194 * lttcomm_session_msg (lsm) contains the command and data request of
1195 * the client.
1196 */
1197 DBG("Receiving data from client ...");
1198 ret = lttcomm_recv_unix_sock(sock, cmd_ctx->lsm, sizeof(struct lttcomm_session_msg));
1199 if (ret <= 0) {
1200 continue;
1201 }
1202
f7776ea7
DG
1203 // TODO: Validate cmd_ctx including sanity check for security purpose.
1204
1d4b027a
DG
1205 /*
1206 * This function dispatch the work to the kernel or userspace tracer
1207 * libs and fill the lttcomm_lttng_msg data structure of all the needed
1208 * informations for the client. The command context struct contains
1209 * everything this function may needs.
1210 */
1211 ret = process_client_msg(cmd_ctx);
1212 if (ret < 0) {
1213 /* TODO: Inform client somehow of the fatal error. At this point,
1214 * ret < 0 means that a malloc failed (ENOMEM). */
1215 /* Error detected but still accept command */
1216 clean_command_ctx(cmd_ctx);
1217 continue;
1218 }
1219
1220 DBG("Sending response (size: %d, retcode: %d)",
1221 cmd_ctx->lttng_msg_size, cmd_ctx->llm->ret_code);
1222 ret = send_unix_sock(sock, cmd_ctx->llm, cmd_ctx->lttng_msg_size);
1223 if (ret < 0) {
1224 ERR("Failed to send data back to client");
1225 }
1226
1227 clean_command_ctx(cmd_ctx);
d6e4fca4
DG
1228
1229 /* End of transmission */
1230 close(sock);
1d4b027a
DG
1231 }
1232
1233error:
1234 return NULL;
1235}
1236
1237
fac6795d
DG
1238/*
1239 * usage function on stderr
1240 */
1241static void usage(void)
1242{
b716ce68 1243 fprintf(stderr, "Usage: %s OPTIONS\n\nOptions:\n", progname);
d6f42150
DG
1244 fprintf(stderr, " -h, --help Display this usage.\n");
1245 fprintf(stderr, " -c, --client-sock PATH Specify path for the client unix socket\n");
1246 fprintf(stderr, " -a, --apps-sock PATH Specify path for apps unix socket\n");
1247 fprintf(stderr, " --kconsumerd-err-sock PATH Specify path for the kernel consumer error socket\n");
1248 fprintf(stderr, " --kconsumerd-cmd-sock PATH Specify path for the kernel consumer command socket\n");
1249 fprintf(stderr, " -d, --daemonize Start as a daemon.\n");
1250 fprintf(stderr, " -g, --group NAME Specify the tracing group name. (default: tracing)\n");
1251 fprintf(stderr, " -V, --version Show version number.\n");
1252 fprintf(stderr, " -S, --sig-parent Send SIGCHLD to parent pid to notify readiness.\n");
1253 fprintf(stderr, " -q, --quiet No output at all.\n");
1254 fprintf(stderr, " -v, --verbose Verbose mode. Activate DBG() macro.\n");
fac6795d
DG
1255}
1256
1257/*
1258 * daemon argument parsing
1259 */
1260static int parse_args(int argc, char **argv)
1261{
1262 int c;
1263
1264 static struct option long_options[] = {
1265 { "client-sock", 1, 0, 'c' },
1266 { "apps-sock", 1, 0, 'a' },
d6f42150
DG
1267 { "kconsumerd-cmd-sock", 1, 0, 0 },
1268 { "kconsumerd-err-sock", 1, 0, 0 },
fac6795d 1269 { "daemonize", 0, 0, 'd' },
5b8719f5 1270 { "sig-parent", 0, 0, 'S' },
fac6795d
DG
1271 { "help", 0, 0, 'h' },
1272 { "group", 1, 0, 'g' },
1273 { "version", 0, 0, 'V' },
75462a81 1274 { "quiet", 0, 0, 'q' },
3f9947db 1275 { "verbose", 0, 0, 'v' },
fac6795d
DG
1276 { NULL, 0, 0, 0 }
1277 };
1278
1279 while (1) {
1280 int option_index = 0;
d6f42150 1281 c = getopt_long(argc, argv, "dhqvVS" "a:c:g:s:E:C:", long_options, &option_index);
fac6795d
DG
1282 if (c == -1) {
1283 break;
1284 }
1285
1286 switch (c) {
1287 case 0:
1288 fprintf(stderr, "option %s", long_options[option_index].name);
1289 if (optarg) {
1290 fprintf(stderr, " with arg %s\n", optarg);
1291 }
1292 break;
b716ce68 1293 case 'c':
fac6795d
DG
1294 snprintf(client_unix_sock_path, PATH_MAX, "%s", optarg);
1295 break;
1296 case 'a':
1297 snprintf(apps_unix_sock_path, PATH_MAX, "%s", optarg);
1298 break;
1299 case 'd':
1300 opt_daemon = 1;
1301 break;
1302 case 'g':
1303 opt_tracing_group = strdup(optarg);
1304 break;
1305 case 'h':
1306 usage();
1307 exit(EXIT_FAILURE);
1308 case 'V':
1309 fprintf(stdout, "%s\n", VERSION);
1310 exit(EXIT_SUCCESS);
5b8719f5
DG
1311 case 'S':
1312 opt_sig_parent = 1;
1313 break;
d6f42150
DG
1314 case 'E':
1315 snprintf(kconsumerd_err_unix_sock_path, PATH_MAX, "%s", optarg);
1316 break;
1317 case 'C':
1318 snprintf(kconsumerd_cmd_unix_sock_path, PATH_MAX, "%s", optarg);
1319 break;
75462a81
DG
1320 case 'q':
1321 opt_quiet = 1;
1322 break;
3f9947db
DG
1323 case 'v':
1324 opt_verbose = 1;
1325 break;
fac6795d
DG
1326 default:
1327 /* Unknown option or other error.
1328 * Error is printed by getopt, just return */
1329 return -1;
1330 }
1331 }
1332
1333 return 0;
1334}
1335
1336/*
1337 * init_daemon_socket
1338 *
1339 * Creates the two needed socket by the daemon.
d6f42150
DG
1340 * apps_sock - The communication socket for all UST apps.
1341 * client_sock - The communication of the cli tool (lttng).
fac6795d
DG
1342 */
1343static int init_daemon_socket()
1344{
1345 int ret = 0;
1346 mode_t old_umask;
1347
1348 old_umask = umask(0);
1349
1350 /* Create client tool unix socket */
d6f42150
DG
1351 client_sock = lttcomm_create_unix_sock(client_unix_sock_path);
1352 if (client_sock < 0) {
1353 ERR("Create unix sock failed: %s", client_unix_sock_path);
fac6795d
DG
1354 ret = -1;
1355 goto end;
1356 }
1357
1358 /* File permission MUST be 660 */
1359 ret = chmod(client_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
1360 if (ret < 0) {
d6f42150 1361 ERR("Set file permissions failed: %s", client_unix_sock_path);
fac6795d
DG
1362 perror("chmod");
1363 goto end;
1364 }
1365
1366 /* Create the application unix socket */
d6f42150
DG
1367 apps_sock = lttcomm_create_unix_sock(apps_unix_sock_path);
1368 if (apps_sock < 0) {
1369 ERR("Create unix sock failed: %s", apps_unix_sock_path);
fac6795d
DG
1370 ret = -1;
1371 goto end;
1372 }
1373
d6f42150 1374 /* File permission MUST be 666 */
fac6795d
DG
1375 ret = chmod(apps_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH);
1376 if (ret < 0) {
d6f42150 1377 ERR("Set file permissions failed: %s", apps_unix_sock_path);
fac6795d
DG
1378 perror("chmod");
1379 goto end;
1380 }
1381
1382end:
1383 umask(old_umask);
1384 return ret;
1385}
1386
1387/*
1388 * check_existing_daemon
1389 *
1390 * Check if the global socket is available.
62bd06d8 1391 * If yes, error is returned.
fac6795d
DG
1392 */
1393static int check_existing_daemon()
1394{
1395 int ret;
1396
1397 ret = access(client_unix_sock_path, F_OK);
1398 if (ret == 0) {
1399 ret = access(apps_unix_sock_path, F_OK);
1400 }
1401
1402 return ret;
1403}
1404
1405/*
62bd06d8 1406 * get_home_dir
fac6795d 1407 *
62bd06d8
DG
1408 * Return pointer to home directory path using
1409 * the env variable HOME.
fac6795d 1410 *
62bd06d8 1411 * Default : /tmp
fac6795d
DG
1412 */
1413static const char *get_home_dir(void)
1414{
1415 const char *home_path;
1416
686204ab 1417 if ((home_path = (const char *) getenv("HOME")) == NULL) {
fac6795d
DG
1418 home_path = default_home_dir;
1419 }
1420
1421 return home_path;
1422}
1423
1424/*
d6f42150 1425 * set_permissions
fac6795d 1426 *
5e16da05
MD
1427 * Set the tracing group gid onto the client socket.
1428 *
1429 * Race window between mkdir and chown is OK because we are going from
1430 * less permissive (root.root) to more permissive (root.tracing).
fac6795d 1431 */
d6f42150 1432static int set_permissions(void)
fac6795d
DG
1433{
1434 int ret;
1435 struct group *grp;
1436
1437 /* Decide which group name to use */
1438 (opt_tracing_group != NULL) ?
1439 (grp = getgrnam(opt_tracing_group)) :
1440 (grp = getgrnam(default_tracing_group));
1441
1442 if (grp == NULL) {
75462a81 1443 ERR("Missing tracing group. Aborting execution.\n");
fac6795d
DG
1444 ret = -1;
1445 goto end;
1446 }
1447
d6f42150
DG
1448 /* Set lttng run dir */
1449 ret = chown(LTTNG_RUNDIR, 0, grp->gr_gid);
1450 if (ret < 0) {
1451 ERR("Unable to set group on " LTTNG_RUNDIR);
1452 perror("chown");
1453 }
1454
1455 /* lttng client socket path */
fac6795d
DG
1456 ret = chown(client_unix_sock_path, 0, grp->gr_gid);
1457 if (ret < 0) {
d6f42150
DG
1458 ERR("Unable to set group on %s", client_unix_sock_path);
1459 perror("chown");
1460 }
1461
1462 /* kconsumerd error socket path */
1463 ret = chown(kconsumerd_err_unix_sock_path, 0, grp->gr_gid);
1464 if (ret < 0) {
1465 ERR("Unable to set group on %s", kconsumerd_err_unix_sock_path);
fac6795d
DG
1466 perror("chown");
1467 }
1468
d6f42150 1469 DBG("All permissions are set");
e07ae692 1470
fac6795d
DG
1471end:
1472 return ret;
1473}
1474
d6f42150
DG
1475/*
1476 * create_lttng_rundir
1477 *
1478 * Create the lttng run directory needed for all
1479 * global sockets and pipe.
1480 */
1481static int create_lttng_rundir(void)
1482{
1483 int ret;
1484
1485 ret = mkdir(LTTNG_RUNDIR, S_IRWXU | S_IRWXG );
1486 if (ret < 0) {
b1f11e69
DG
1487 if (errno != EEXIST) {
1488 ERR("Unable to create " LTTNG_RUNDIR);
1489 goto error;
1490 } else {
1491 ret = 0;
1492 }
d6f42150
DG
1493 }
1494
1495error:
1496 return ret;
1497}
1498
1499/*
1500 * set_kconsumerd_sockets
1501 *
1502 * Setup sockets and directory needed by the kconsumerd
1503 * communication with the session daemon.
1504 */
1505static int set_kconsumerd_sockets(void)
1506{
1507 int ret;
1508
1509 if (strlen(kconsumerd_err_unix_sock_path) == 0) {
1510 snprintf(kconsumerd_err_unix_sock_path, PATH_MAX, KCONSUMERD_ERR_SOCK_PATH);
1511 }
1512
1513 if (strlen(kconsumerd_cmd_unix_sock_path) == 0) {
1514 snprintf(kconsumerd_cmd_unix_sock_path, PATH_MAX, KCONSUMERD_CMD_SOCK_PATH);
1515 }
1516
1517 ret = mkdir(KCONSUMERD_PATH, S_IRWXU | S_IRWXG);
1518 if (ret < 0) {
6beb2242
DG
1519 if (errno != EEXIST) {
1520 ERR("Failed to create " KCONSUMERD_PATH);
1521 goto error;
1522 }
1523 ret = 0;
d6f42150
DG
1524 }
1525
1526 /* Create the kconsumerd error unix socket */
1527 kconsumerd_err_sock = lttcomm_create_unix_sock(kconsumerd_err_unix_sock_path);
1528 if (kconsumerd_err_sock < 0) {
1529 ERR("Create unix sock failed: %s", kconsumerd_err_unix_sock_path);
1530 ret = -1;
1531 goto error;
1532 }
1533
1534 /* File permission MUST be 660 */
1535 ret = chmod(kconsumerd_err_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
1536 if (ret < 0) {
1537 ERR("Set file permissions failed: %s", kconsumerd_err_unix_sock_path);
1538 perror("chmod");
1539 goto error;
1540 }
1541
1542error:
1543 return ret;
1544}
1545
fac6795d 1546/*
62bd06d8 1547 * sighandler
fac6795d 1548 *
62bd06d8 1549 * Signal handler for the daemon
fac6795d
DG
1550 */
1551static void sighandler(int sig)
1552{
1553 switch (sig) {
1554 case SIGPIPE:
e07ae692 1555 DBG("SIGPIPE catched");
87378cf5 1556 return;
fac6795d 1557 case SIGINT:
e07ae692
DG
1558 DBG("SIGINT catched");
1559 cleanup();
1560 break;
fac6795d 1561 case SIGTERM:
e07ae692 1562 DBG("SIGTERM catched");
fac6795d 1563 cleanup();
686204ab 1564 break;
fac6795d
DG
1565 default:
1566 break;
1567 }
1568
1569 exit(EXIT_SUCCESS);
1570}
1571
1572/*
1d4b027a 1573 * set_signal_handler
fac6795d 1574 *
1d4b027a
DG
1575 * Setup signal handler for :
1576 * SIGINT, SIGTERM, SIGPIPE
fac6795d 1577 */
1d4b027a 1578static int set_signal_handler(void)
fac6795d 1579{
1d4b027a
DG
1580 int ret = 0;
1581 struct sigaction sa;
1582 sigset_t sigset;
fac6795d 1583
1d4b027a
DG
1584 if ((ret = sigemptyset(&sigset)) < 0) {
1585 perror("sigemptyset");
1586 return ret;
1587 }
d6f42150 1588
1d4b027a
DG
1589 sa.sa_handler = sighandler;
1590 sa.sa_mask = sigset;
1591 sa.sa_flags = 0;
1592 if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) {
1593 perror("sigaction");
1594 return ret;
d6f42150
DG
1595 }
1596
1d4b027a
DG
1597 if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) {
1598 perror("sigaction");
1599 return ret;
d6f42150 1600 }
aaf26714 1601
1d4b027a
DG
1602 if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) {
1603 perror("sigaction");
1604 return ret;
8c0faa1d
DG
1605 }
1606
1d4b027a
DG
1607 DBG("Signal handler set for SIGTERM, SIGPIPE and SIGINT");
1608
1609 return ret;
fac6795d
DG
1610}
1611
1612/*
1613 * main
1614 */
1615int main(int argc, char **argv)
1616{
fac6795d
DG
1617 int ret = 0;
1618 void *status;
fac6795d
DG
1619
1620 /* Parse arguments */
1621 progname = argv[0];
1622 if ((ret = parse_args(argc, argv) < 0)) {
1623 goto error;
1624 }
1625
1626 /* Daemonize */
1627 if (opt_daemon) {
53094c05
DG
1628 ret = daemon(0, 0);
1629 if (ret < 0) {
1630 perror("daemon");
1631 goto error;
1632 }
fac6795d
DG
1633 }
1634
1635 /* Check if daemon is UID = 0 */
1636 is_root = !getuid();
1637
1638 /* Set all sockets path */
1639 if (is_root) {
d6f42150
DG
1640 ret = create_lttng_rundir();
1641 if (ret < 0) {
1642 goto error;
1643 }
1644
fac6795d 1645 if (strlen(apps_unix_sock_path) == 0) {
d6f42150
DG
1646 snprintf(apps_unix_sock_path, PATH_MAX,
1647 DEFAULT_GLOBAL_APPS_UNIX_SOCK);
fac6795d
DG
1648 }
1649
1650 if (strlen(client_unix_sock_path) == 0) {
d6f42150
DG
1651 snprintf(client_unix_sock_path, PATH_MAX,
1652 DEFAULT_GLOBAL_CLIENT_UNIX_SOCK);
1653 }
1654
1655 ret = set_kconsumerd_sockets();
1656 if (ret < 0) {
1657 goto error;
fac6795d 1658 }
20fe2104
DG
1659
1660 /* Setup kernel tracer */
1661 init_kernel_tracer();
fac6795d
DG
1662 } else {
1663 if (strlen(apps_unix_sock_path) == 0) {
d6f42150
DG
1664 snprintf(apps_unix_sock_path, PATH_MAX,
1665 DEFAULT_HOME_APPS_UNIX_SOCK, get_home_dir());
fac6795d
DG
1666 }
1667
1668 /* Set the cli tool unix socket path */
1669 if (strlen(client_unix_sock_path) == 0) {
d6f42150
DG
1670 snprintf(client_unix_sock_path, PATH_MAX,
1671 DEFAULT_HOME_CLIENT_UNIX_SOCK, get_home_dir());
fac6795d
DG
1672 }
1673 }
1674
847177cd
DG
1675 DBG("Client socket path %s", client_unix_sock_path);
1676 DBG("Application socket path %s", apps_unix_sock_path);
1677
fac6795d
DG
1678 /* See if daemon already exist. If any of the two
1679 * socket needed by the daemon are present, this test fails
1680 */
1681 if ((ret = check_existing_daemon()) == 0) {
75462a81 1682 ERR("Already running daemon.\n");
ab118b20 1683 /* We do not goto error because we must not
d6f42150 1684 * cleanup() because a daemon is already running.
ab118b20 1685 */
5e16da05 1686 exit(EXIT_FAILURE);
fac6795d
DG
1687 }
1688
1689 if (set_signal_handler() < 0) {
1690 goto error;
1691 }
1692
d6f42150 1693 /* Setup the needed unix socket */
fac6795d
DG
1694 if (init_daemon_socket() < 0) {
1695 goto error;
1696 }
1697
1698 /* Set credentials to socket */
d6f42150 1699 if (is_root && (set_permissions() < 0)) {
fac6795d
DG
1700 goto error;
1701 }
1702
5b8719f5
DG
1703 /* Get parent pid if -S, --sig-parent is specified. */
1704 if (opt_sig_parent) {
1705 ppid = getppid();
1706 }
1707
fac6795d
DG
1708 while (1) {
1709 /* Create thread to manage the client socket */
1d4b027a 1710 ret = pthread_create(&client_thread, NULL, thread_manage_clients, (void *) NULL);
fac6795d
DG
1711 if (ret != 0) {
1712 perror("pthread_create");
1713 goto error;
1714 }
1715
1716 /* Create thread to manage application socket */
1d4b027a 1717 ret = pthread_create(&apps_thread, NULL, thread_manage_apps, (void *) NULL);
fac6795d
DG
1718 if (ret != 0) {
1719 perror("pthread_create");
1720 goto error;
1721 }
1722
1d4b027a
DG
1723 ret = pthread_join(client_thread, &status);
1724 if (ret != 0) {
1725 perror("pthread_join");
1726 goto error;
fac6795d
DG
1727 }
1728 }
1729
1730 cleanup();
5e16da05 1731 exit(EXIT_SUCCESS);
fac6795d
DG
1732
1733error:
1734 cleanup();
5e16da05 1735 exit(EXIT_FAILURE);
fac6795d 1736}
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