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