Commit | Line | Data |
---|---|---|
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> | |
25 | #include <signal.h> | |
26 | #include <stdio.h> | |
27 | #include <stdlib.h> | |
28 | #include <string.h> | |
29 | #include <sys/ipc.h> | |
30 | #include <sys/shm.h> | |
31 | #include <sys/socket.h> | |
32 | #include <sys/stat.h> | |
33 | #include <sys/types.h> | |
34 | #include <unistd.h> | |
35 | ||
36 | #include <urcu/list.h> /* URCU list library (-lurcu) */ | |
37 | #include <ust/ustctl.h> /* UST control lib (-lust) */ | |
ca95a216 | 38 | #include <lttng/liblttngctl.h> |
fac6795d DG |
39 | |
40 | #include "liblttsessiondcomm.h" | |
41 | #include "ltt-sessiond.h" | |
75462a81 | 42 | #include "lttngerr.h" |
5b74c7b1 | 43 | #include "session.h" |
fda89c9b | 44 | #include "trace.h" |
91d76f53 | 45 | #include "traceable-app.h" |
fac6795d | 46 | |
75462a81 | 47 | /* Const values */ |
686204ab MD |
48 | const char default_home_dir[] = DEFAULT_HOME_DIR; |
49 | const char default_tracing_group[] = DEFAULT_TRACING_GROUP; | |
50 | const char default_ust_sock_dir[] = DEFAULT_UST_SOCK_DIR; | |
51 | const char default_global_apps_pipe[] = DEFAULT_GLOBAL_APPS_PIPE; | |
52 | ||
fac6795d | 53 | /* Static functions */ |
fac6795d | 54 | static int check_existing_daemon(void); |
1fd70b72 | 55 | static int connect_app(pid_t pid); |
fac6795d | 56 | static int init_daemon_socket(void); |
62bd06d8 | 57 | static int notify_apps(const char* name); |
e065084a DG |
58 | static int process_client_msg(int sock, struct lttcomm_session_msg*); |
59 | static int send_unix_sock(int sock, void *buf, size_t len); | |
62bd06d8 DG |
60 | static int set_signal_handler(void); |
61 | static int set_socket_perms(void); | |
aaf97519 | 62 | static int setup_data_buffer(char **buf, size_t size, struct lttcomm_lttng_msg *llm); |
62bd06d8 DG |
63 | static void cleanup(void); |
64 | static void copy_common_data(struct lttcomm_lttng_msg *llm, struct lttcomm_session_msg *lsm); | |
65 | static void sighandler(int sig); | |
fac6795d | 66 | |
1fd70b72 DG |
67 | static void *thread_manage_clients(void *data); |
68 | static void *thread_manage_apps(void *data); | |
fac6795d | 69 | |
fac6795d | 70 | /* Variables */ |
62bd06d8 DG |
71 | int opt_verbose; |
72 | int opt_quiet; | |
fac6795d DG |
73 | const char *progname; |
74 | const char *opt_tracing_group; | |
5b8719f5 | 75 | static int opt_sig_parent; |
fac6795d DG |
76 | static int opt_daemon; |
77 | static int is_root; /* Set to 1 if the daemon is running as root */ | |
5b8719f5 | 78 | static pid_t ppid; |
fac6795d DG |
79 | |
80 | static char apps_unix_sock_path[PATH_MAX]; /* Global application Unix socket path */ | |
81 | static char client_unix_sock_path[PATH_MAX]; /* Global client Unix socket path */ | |
82 | ||
83 | static int client_socket; | |
84 | static int apps_socket; | |
85 | ||
86 | static struct ltt_session *current_session; | |
e065084a | 87 | |
fac6795d DG |
88 | /* |
89 | * thread_manage_apps | |
90 | * | |
91 | * This thread manage the application socket communication | |
92 | */ | |
93 | static void *thread_manage_apps(void *data) | |
94 | { | |
95 | int sock, ret; | |
fac6795d DG |
96 | |
97 | /* TODO: Something more elegant is needed but fine for now */ | |
686204ab | 98 | struct { |
fac6795d | 99 | int reg; /* 1:register, 0:unregister */ |
686204ab MD |
100 | pid_t pid; |
101 | uid_t uid; | |
102 | } reg_msg; | |
fac6795d DG |
103 | |
104 | /* Notify all applications to register */ | |
105 | notify_apps(default_global_apps_pipe); | |
106 | ||
107 | ret = lttcomm_listen_unix_sock(apps_socket); | |
108 | if (ret < 0) { | |
109 | goto error; | |
110 | } | |
111 | ||
112 | while (1) { | |
113 | /* Blocking call, waiting for transmission */ | |
114 | sock = lttcomm_accept_unix_sock(apps_socket); | |
115 | if (sock < 0) { | |
116 | goto error; | |
117 | } | |
118 | ||
119 | /* Basic recv here to handle the very simple data | |
120 | * that the libust send to register (reg_msg). | |
121 | */ | |
122 | ret = recv(sock, ®_msg, sizeof(reg_msg), 0); | |
123 | if (ret < 0) { | |
124 | perror("recv"); | |
125 | continue; | |
126 | } | |
127 | ||
128 | /* Add application to the global traceable list */ | |
129 | if (reg_msg.reg == 1) { | |
130 | /* Registering */ | |
91d76f53 DG |
131 | ret = register_traceable_app(reg_msg.pid, reg_msg.uid); |
132 | if (ret < 0) { | |
133 | /* register_traceable_app only return an error with | |
134 | * ENOMEM. At this point, we better stop everything. | |
135 | */ | |
136 | goto error; | |
137 | } | |
fac6795d DG |
138 | } else { |
139 | /* Unregistering */ | |
91d76f53 | 140 | unregister_traceable_app(reg_msg.pid); |
fac6795d DG |
141 | } |
142 | } | |
143 | ||
144 | error: | |
145 | ||
146 | return NULL; | |
147 | } | |
148 | ||
149 | /* | |
150 | * thread_manage_clients | |
151 | * | |
152 | * This thread manage all clients request using the unix | |
153 | * client socket for communication. | |
154 | */ | |
155 | static void *thread_manage_clients(void *data) | |
156 | { | |
157 | int sock, ret; | |
158 | struct lttcomm_session_msg lsm; | |
fac6795d DG |
159 | |
160 | ret = lttcomm_listen_unix_sock(client_socket); | |
161 | if (ret < 0) { | |
162 | goto error; | |
163 | } | |
164 | ||
5b8719f5 DG |
165 | /* Notify parent pid that we are ready |
166 | * to accept command for client side. | |
167 | */ | |
168 | if (opt_sig_parent) { | |
169 | kill(ppid, SIGCHLD); | |
170 | } | |
171 | ||
fac6795d DG |
172 | while (1) { |
173 | /* Blocking call, waiting for transmission */ | |
174 | sock = lttcomm_accept_unix_sock(client_socket); | |
175 | if (sock < 0) { | |
176 | goto error; | |
177 | } | |
178 | ||
179 | /* | |
180 | * Data is received from the lttng client. The struct | |
181 | * lttcomm_session_msg (lsm) contains the command and data | |
182 | * request of the client. | |
183 | */ | |
184 | ret = lttcomm_recv_unix_sock(sock, &lsm, sizeof(lsm)); | |
87378cf5 | 185 | if (ret <= 0) { |
fac6795d DG |
186 | continue; |
187 | } | |
188 | ||
189 | /* This function dispatch the work to the LTTng or UST libs | |
e065084a DG |
190 | * and then sends back the response to the client. This is needed |
191 | * because there might be more then one lttcomm_lttng_msg to | |
192 | * send out so process_client_msg do both jobs. | |
fac6795d | 193 | */ |
e065084a DG |
194 | ret = process_client_msg(sock, &lsm); |
195 | if (ret < 0) { | |
196 | /* Error detected but still accept command */ | |
197 | continue; | |
fac6795d DG |
198 | } |
199 | } | |
200 | ||
201 | error: | |
202 | return NULL; | |
203 | } | |
204 | ||
e065084a DG |
205 | /* |
206 | * send_unix_sock | |
207 | * | |
208 | * Send data on a unix socket using the liblttsessiondcomm API. | |
209 | * | |
210 | * Return lttcomm error code. | |
211 | */ | |
212 | static int send_unix_sock(int sock, void *buf, size_t len) | |
213 | { | |
214 | /* Check valid length */ | |
215 | if (len <= 0) { | |
216 | return -1; | |
217 | } | |
218 | ||
219 | return lttcomm_send_unix_sock(sock, buf, len); | |
220 | } | |
221 | ||
fac6795d DG |
222 | /* |
223 | * connect_app | |
224 | * | |
225 | * Return a socket connected to the libust communication socket | |
226 | * of the application identified by the pid. | |
379473d2 DG |
227 | * |
228 | * If the pid is not found in the traceable list, | |
229 | * return -1 to indicate error. | |
fac6795d DG |
230 | */ |
231 | static int connect_app(pid_t pid) | |
232 | { | |
91d76f53 DG |
233 | int sock; |
234 | struct ltt_traceable_app *lta; | |
379473d2 | 235 | |
91d76f53 DG |
236 | lta = find_app_by_pid(pid); |
237 | if (lta == NULL) { | |
238 | /* App not found */ | |
379473d2 DG |
239 | return -1; |
240 | } | |
fac6795d | 241 | |
91d76f53 | 242 | sock = ustctl_connect_pid(lta->pid); |
fac6795d | 243 | if (sock < 0) { |
75462a81 | 244 | ERR("Fail connecting to the PID %d\n", pid); |
fac6795d DG |
245 | } |
246 | ||
247 | return sock; | |
248 | } | |
249 | ||
250 | /* | |
251 | * notify_apps | |
252 | * | |
253 | * Notify apps by writing 42 to a named pipe using name. | |
254 | * Every applications waiting for a ltt-sessiond will be notified | |
255 | * and re-register automatically to the session daemon. | |
256 | * | |
257 | * Return open or write error value. | |
258 | */ | |
259 | static int notify_apps(const char *name) | |
260 | { | |
261 | int fd; | |
262 | int ret = -1; | |
263 | ||
264 | /* Try opening the global pipe */ | |
265 | fd = open(name, O_WRONLY); | |
266 | if (fd < 0) { | |
267 | goto error; | |
268 | } | |
269 | ||
270 | /* Notify by writing on the pipe */ | |
271 | ret = write(fd, "42", 2); | |
272 | if (ret < 0) { | |
273 | perror("write"); | |
274 | } | |
275 | ||
276 | error: | |
277 | return ret; | |
278 | } | |
279 | ||
379473d2 DG |
280 | /* |
281 | * ust_create_trace | |
282 | * | |
283 | * Create an userspace trace using pid. | |
284 | * This trace is then appended to the current session | |
285 | * ust trace list. | |
286 | */ | |
287 | static int ust_create_trace(pid_t pid) | |
288 | { | |
289 | int sock, ret; | |
290 | struct ltt_ust_trace *trace; | |
291 | ||
292 | trace = malloc(sizeof(struct ltt_ust_trace)); | |
293 | if (trace == NULL) { | |
294 | perror("malloc"); | |
295 | ret = -1; | |
296 | goto error; | |
297 | } | |
298 | ||
299 | /* Init */ | |
300 | trace->pid = pid; | |
301 | trace->shmid = 0; | |
302 | ||
303 | /* Connect to app using ustctl API */ | |
304 | sock = connect_app(pid); | |
305 | if (sock < 0) { | |
306 | ret = LTTCOMM_NO_TRACEABLE; | |
307 | goto error; | |
308 | } | |
309 | ||
310 | ret = ustctl_create_trace(sock, "auto"); | |
311 | if (ret < 0) { | |
312 | ret = LTTCOMM_CREATE_FAIL; | |
313 | goto error; | |
314 | } | |
315 | ||
316 | /* Check if current session is valid */ | |
317 | if (current_session) { | |
318 | cds_list_add(&trace->list, ¤t_session->ust_traces); | |
319 | } | |
320 | ||
321 | error: | |
322 | return ret; | |
323 | } | |
324 | ||
ce3d728c DG |
325 | /* |
326 | * ust_start_trace | |
327 | * | |
328 | * Start a trace. This trace, identified by the pid, must be | |
329 | * in the current session ust_traces list. | |
330 | */ | |
331 | static int ust_start_trace(pid_t pid) | |
332 | { | |
333 | int sock, ret; | |
334 | struct ltt_ust_trace *trace; | |
335 | ||
336 | DBG("Starting trace for pid %d", pid); | |
337 | ||
338 | trace = find_session_ust_trace_by_pid(current_session, pid); | |
339 | if (trace == NULL) { | |
340 | ret = LTTCOMM_NO_TRACE; | |
341 | goto error; | |
342 | } | |
343 | ||
344 | /* Connect to app using ustctl API */ | |
345 | sock = connect_app(pid); | |
346 | if (sock < 0) { | |
347 | ret = LTTCOMM_NO_TRACEABLE; | |
348 | goto error; | |
349 | } | |
350 | ||
351 | ret = ustctl_start_trace(sock, "auto"); | |
352 | if (ret < 0) { | |
353 | ret = LTTCOMM_START_FAIL; | |
354 | goto error; | |
355 | } | |
356 | ||
357 | error: | |
358 | return ret; | |
359 | } | |
360 | ||
e065084a DG |
361 | /* |
362 | * copy_common_data | |
363 | * | |
364 | * Copy common data between lttcomm_lttng_msg and lttcomm_session_msg | |
365 | */ | |
366 | static void copy_common_data(struct lttcomm_lttng_msg *llm, struct lttcomm_session_msg *lsm) | |
367 | { | |
368 | llm->cmd_type = lsm->cmd_type; | |
369 | llm->pid = lsm->pid; | |
aaf97519 DG |
370 | |
371 | /* Manage uuid */ | |
8028d920 DG |
372 | if (!uuid_is_null(lsm->session_id)) { |
373 | uuid_copy(llm->session_id, lsm->session_id); | |
e065084a | 374 | } |
aaf97519 DG |
375 | |
376 | strncpy(llm->trace_name, lsm->trace_name, strlen(llm->trace_name)); | |
8028d920 | 377 | llm->trace_name[strlen(llm->trace_name) - 1] = '\0'; |
e065084a DG |
378 | } |
379 | ||
ca95a216 DG |
380 | /* |
381 | * setup_data_buffer | |
382 | * | |
383 | * Setup the outgoing data buffer for the response | |
384 | * data allocating the right amount of memory. | |
385 | * | |
386 | * Return total size of the buffer pointed by buf. | |
387 | */ | |
aaf97519 | 388 | static int setup_data_buffer(char **buf, size_t s_data, struct lttcomm_lttng_msg *llm) |
ca95a216 DG |
389 | { |
390 | int ret = 0; | |
ca95a216 DG |
391 | size_t buf_size; |
392 | ||
393 | buf_size = sizeof(struct lttcomm_lttng_msg) + s_data; | |
aaf97519 DG |
394 | *buf = malloc(buf_size); |
395 | if (*buf == NULL) { | |
ca95a216 DG |
396 | perror("malloc"); |
397 | ret = -1; | |
398 | goto error; | |
399 | } | |
400 | ||
401 | /* Setup lttcomm_lttng_msg data and copy | |
402 | * it to the newly allocated buffer. | |
403 | */ | |
404 | llm->size_payload = s_data; | |
aaf97519 | 405 | memcpy(*buf, llm, sizeof(struct lttcomm_lttng_msg)); |
ca95a216 DG |
406 | |
407 | return buf_size; | |
408 | ||
409 | error: | |
410 | return ret; | |
411 | } | |
412 | ||
fac6795d DG |
413 | /* |
414 | * process_client_msg | |
415 | * | |
416 | * This takes the lttcomm_session_msg struct and process the command requested | |
e065084a DG |
417 | * by the client. It then creates response(s) and send it back to the |
418 | * given socket (sock). | |
fac6795d | 419 | * |
e065084a | 420 | * Return any error encountered or 0 for success. |
fac6795d | 421 | */ |
e065084a | 422 | static int process_client_msg(int sock, struct lttcomm_session_msg *lsm) |
fac6795d | 423 | { |
e065084a | 424 | int ret; |
ca95a216 | 425 | int buf_size; |
7e6e59cd | 426 | size_t header_size; |
aaf97519 DG |
427 | char *send_buf = NULL; |
428 | struct lttcomm_lttng_msg llm; | |
fac6795d DG |
429 | |
430 | /* Copy common data to identify the response | |
431 | * on the lttng client side. | |
432 | */ | |
e065084a | 433 | copy_common_data(&llm, lsm); |
fac6795d | 434 | |
379473d2 DG |
435 | /* Check command that needs a session */ |
436 | if (lsm->cmd_type != LTTNG_CREATE_SESSION && | |
437 | lsm->cmd_type != LTTNG_LIST_SESSIONS && | |
438 | lsm->cmd_type != UST_LIST_APPS) | |
439 | { | |
440 | current_session = find_session_by_uuid(lsm->session_id); | |
441 | if (current_session == NULL) { | |
442 | ret = LTTCOMM_SELECT_SESS; | |
443 | goto end; | |
444 | } | |
445 | } | |
446 | ||
fac6795d | 447 | /* Default return code. |
e065084a | 448 | * In our world, everything is OK... right? ;) |
fac6795d | 449 | */ |
e065084a | 450 | llm.ret_code = LTTCOMM_OK; |
fac6795d | 451 | |
7e6e59cd DG |
452 | header_size = sizeof(struct lttcomm_lttng_msg); |
453 | ||
fac6795d DG |
454 | /* Process by command type */ |
455 | switch (lsm->cmd_type) { | |
aaf97519 DG |
456 | case LTTNG_CREATE_SESSION: |
457 | { | |
8028d920 | 458 | ret = create_session(lsm->session_name, &llm.session_id); |
aaf97519 | 459 | if (ret < 0) { |
27673bb6 DG |
460 | if (ret == -1) { |
461 | ret = LTTCOMM_EXIST_SESS; | |
462 | } else { | |
463 | ret = LTTCOMM_FATAL; | |
464 | } | |
8028d920 | 465 | goto end; |
aaf97519 DG |
466 | } |
467 | ||
aaf97519 DG |
468 | buf_size = setup_data_buffer(&send_buf, 0, &llm); |
469 | if (buf_size < 0) { | |
470 | ret = LTTCOMM_FATAL; | |
8028d920 | 471 | goto end; |
aaf97519 DG |
472 | } |
473 | ||
aaf97519 DG |
474 | break; |
475 | } | |
8028d920 DG |
476 | case LTTNG_DESTROY_SESSION: |
477 | { | |
478 | ret = destroy_session(&lsm->session_id); | |
479 | if (ret < 0) { | |
480 | ret = LTTCOMM_NO_SESS; | |
481 | } else { | |
482 | ret = LTTCOMM_OK; | |
483 | } | |
484 | ||
485 | /* No auxiliary data so only send the llm struct. */ | |
486 | goto end; | |
487 | } | |
df0da139 DG |
488 | case UST_CREATE_TRACE: |
489 | { | |
379473d2 | 490 | ret = ust_create_trace(lsm->pid); |
df0da139 | 491 | if (ret < 0) { |
ce3d728c DG |
492 | /* If -1 is returned from ust_create_trace, malloc |
493 | * failed so it's pretty much a fatal error. | |
494 | */ | |
495 | ret = LTTCOMM_FATAL; | |
379473d2 | 496 | goto end; |
df0da139 DG |
497 | } |
498 | ||
379473d2 | 499 | /* No auxiliary data so only send the llm struct. */ |
df0da139 DG |
500 | goto end; |
501 | } | |
fac6795d DG |
502 | case UST_LIST_APPS: |
503 | { | |
91d76f53 | 504 | unsigned int app_count = get_app_count(); |
ca95a216 | 505 | /* Stop right now if no apps */ |
91d76f53 | 506 | if (app_count == 0) { |
e065084a | 507 | ret = LTTCOMM_NO_APPS; |
8028d920 | 508 | goto end; |
e065084a DG |
509 | } |
510 | ||
ca95a216 DG |
511 | /* Setup data buffer and details for transmission */ |
512 | buf_size = setup_data_buffer(&send_buf, | |
91d76f53 | 513 | sizeof(pid_t) * app_count, &llm); |
ca95a216 DG |
514 | if (buf_size < 0) { |
515 | ret = LTTCOMM_FATAL; | |
8028d920 | 516 | goto end; |
ca95a216 DG |
517 | } |
518 | ||
91d76f53 | 519 | get_app_list_pids((pid_t *)(send_buf + header_size)); |
ca95a216 | 520 | |
fac6795d DG |
521 | break; |
522 | } | |
ce3d728c DG |
523 | case UST_START_TRACE: |
524 | { | |
525 | ret = ust_start_trace(lsm->pid); | |
526 | ||
527 | /* No auxiliary data so only send the llm struct. */ | |
528 | goto end; | |
529 | } | |
57167058 DG |
530 | case LTTNG_LIST_SESSIONS: |
531 | { | |
5b74c7b1 | 532 | unsigned int session_count = get_session_count(); |
ca95a216 DG |
533 | /* Stop right now if no session */ |
534 | if (session_count == 0) { | |
57167058 | 535 | ret = LTTCOMM_NO_SESS; |
8028d920 | 536 | goto end; |
57167058 DG |
537 | } |
538 | ||
ca95a216 DG |
539 | /* Setup data buffer and details for transmission */ |
540 | buf_size = setup_data_buffer(&send_buf, | |
541 | (sizeof(struct lttng_session) * session_count), &llm); | |
542 | if (buf_size < 0) { | |
543 | ret = LTTCOMM_FATAL; | |
8028d920 | 544 | goto end; |
ca95a216 DG |
545 | } |
546 | ||
5b74c7b1 | 547 | get_lttng_session((struct lttng_session *)(send_buf + header_size)); |
ca95a216 | 548 | |
57167058 DG |
549 | break; |
550 | } | |
fac6795d | 551 | default: |
e065084a | 552 | { |
fac6795d | 553 | /* Undefined command */ |
e065084a | 554 | ret = LTTCOMM_UND; |
8028d920 | 555 | goto end; |
e065084a | 556 | } |
fac6795d DG |
557 | } |
558 | ||
1fd70b72 DG |
559 | ret = send_unix_sock(sock, send_buf, buf_size); |
560 | ||
ca95a216 DG |
561 | if (send_buf != NULL) { |
562 | free(send_buf); | |
563 | } | |
564 | ||
e065084a DG |
565 | return ret; |
566 | ||
8028d920 | 567 | end: |
e065084a DG |
568 | /* Notify client of error */ |
569 | llm.ret_code = ret; | |
ca95a216 | 570 | llm.size_payload = 0; |
e065084a DG |
571 | send_unix_sock(sock, (void*) &llm, sizeof(llm)); |
572 | ||
8028d920 | 573 | return ret; |
fac6795d DG |
574 | } |
575 | ||
576 | /* | |
577 | * usage function on stderr | |
578 | */ | |
579 | static void usage(void) | |
580 | { | |
b716ce68 DG |
581 | fprintf(stderr, "Usage: %s OPTIONS\n\nOptions:\n", progname); |
582 | fprintf(stderr, " -h, --help Display this usage.\n"); | |
583 | fprintf(stderr, " -c, --client-sock PATH Specify path for the client unix socket\n"); | |
584 | fprintf(stderr, " -a, --apps-sock PATH Specify path for apps unix socket.\n"); | |
585 | fprintf(stderr, " -d, --daemonize Start as a daemon.\n"); | |
586 | fprintf(stderr, " -g, --group NAME Specify the tracing group name. (default: tracing)\n"); | |
587 | fprintf(stderr, " -V, --version Show version number.\n"); | |
588 | fprintf(stderr, " -S, --sig-parent Send SIGCHLD to parent pid to notify readiness.\n"); | |
589 | fprintf(stderr, " -q, --quiet No output at all.\n"); | |
fac6795d DG |
590 | } |
591 | ||
592 | /* | |
593 | * daemon argument parsing | |
594 | */ | |
595 | static int parse_args(int argc, char **argv) | |
596 | { | |
597 | int c; | |
598 | ||
599 | static struct option long_options[] = { | |
600 | { "client-sock", 1, 0, 'c' }, | |
601 | { "apps-sock", 1, 0, 'a' }, | |
602 | { "daemonize", 0, 0, 'd' }, | |
5b8719f5 | 603 | { "sig-parent", 0, 0, 'S' }, |
fac6795d DG |
604 | { "help", 0, 0, 'h' }, |
605 | { "group", 1, 0, 'g' }, | |
606 | { "version", 0, 0, 'V' }, | |
75462a81 | 607 | { "quiet", 0, 0, 'q' }, |
fac6795d DG |
608 | { NULL, 0, 0, 0 } |
609 | }; | |
610 | ||
611 | while (1) { | |
612 | int option_index = 0; | |
75462a81 | 613 | c = getopt_long(argc, argv, "dhqVS" "a:c:g:s:", long_options, &option_index); |
fac6795d DG |
614 | if (c == -1) { |
615 | break; | |
616 | } | |
617 | ||
618 | switch (c) { | |
619 | case 0: | |
620 | fprintf(stderr, "option %s", long_options[option_index].name); | |
621 | if (optarg) { | |
622 | fprintf(stderr, " with arg %s\n", optarg); | |
623 | } | |
624 | break; | |
b716ce68 | 625 | case 'c': |
fac6795d DG |
626 | snprintf(client_unix_sock_path, PATH_MAX, "%s", optarg); |
627 | break; | |
628 | case 'a': | |
629 | snprintf(apps_unix_sock_path, PATH_MAX, "%s", optarg); | |
630 | break; | |
631 | case 'd': | |
632 | opt_daemon = 1; | |
633 | break; | |
634 | case 'g': | |
635 | opt_tracing_group = strdup(optarg); | |
636 | break; | |
637 | case 'h': | |
638 | usage(); | |
639 | exit(EXIT_FAILURE); | |
640 | case 'V': | |
641 | fprintf(stdout, "%s\n", VERSION); | |
642 | exit(EXIT_SUCCESS); | |
5b8719f5 DG |
643 | case 'S': |
644 | opt_sig_parent = 1; | |
645 | break; | |
75462a81 DG |
646 | case 'q': |
647 | opt_quiet = 1; | |
648 | break; | |
fac6795d DG |
649 | default: |
650 | /* Unknown option or other error. | |
651 | * Error is printed by getopt, just return */ | |
652 | return -1; | |
653 | } | |
654 | } | |
655 | ||
656 | return 0; | |
657 | } | |
658 | ||
659 | /* | |
660 | * init_daemon_socket | |
661 | * | |
662 | * Creates the two needed socket by the daemon. | |
62bd06d8 DG |
663 | * apps_socket - The communication socket for all UST apps. |
664 | * client_socket - The communication of the cli tool (lttng). | |
fac6795d DG |
665 | */ |
666 | static int init_daemon_socket() | |
667 | { | |
668 | int ret = 0; | |
669 | mode_t old_umask; | |
670 | ||
671 | old_umask = umask(0); | |
672 | ||
673 | /* Create client tool unix socket */ | |
674 | client_socket = lttcomm_create_unix_sock(client_unix_sock_path); | |
675 | if (client_socket < 0) { | |
676 | ret = -1; | |
677 | goto end; | |
678 | } | |
679 | ||
680 | /* File permission MUST be 660 */ | |
681 | ret = chmod(client_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); | |
682 | if (ret < 0) { | |
683 | perror("chmod"); | |
684 | goto end; | |
685 | } | |
686 | ||
687 | /* Create the application unix socket */ | |
688 | apps_socket = lttcomm_create_unix_sock(apps_unix_sock_path); | |
689 | if (apps_socket < 0) { | |
690 | ret = -1; | |
691 | goto end; | |
692 | } | |
693 | ||
694 | /* File permission MUST be 660 */ | |
695 | ret = chmod(apps_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH); | |
696 | if (ret < 0) { | |
697 | perror("chmod"); | |
698 | goto end; | |
699 | } | |
700 | ||
701 | end: | |
702 | umask(old_umask); | |
703 | return ret; | |
704 | } | |
705 | ||
706 | /* | |
707 | * check_existing_daemon | |
708 | * | |
709 | * Check if the global socket is available. | |
62bd06d8 | 710 | * If yes, error is returned. |
fac6795d DG |
711 | */ |
712 | static int check_existing_daemon() | |
713 | { | |
714 | int ret; | |
715 | ||
716 | ret = access(client_unix_sock_path, F_OK); | |
717 | if (ret == 0) { | |
718 | ret = access(apps_unix_sock_path, F_OK); | |
719 | } | |
720 | ||
721 | return ret; | |
722 | } | |
723 | ||
724 | /* | |
62bd06d8 | 725 | * get_home_dir |
fac6795d | 726 | * |
62bd06d8 DG |
727 | * Return pointer to home directory path using |
728 | * the env variable HOME. | |
fac6795d | 729 | * |
62bd06d8 | 730 | * Default : /tmp |
fac6795d DG |
731 | */ |
732 | static const char *get_home_dir(void) | |
733 | { | |
734 | const char *home_path; | |
735 | ||
686204ab | 736 | if ((home_path = (const char *) getenv("HOME")) == NULL) { |
fac6795d DG |
737 | home_path = default_home_dir; |
738 | } | |
739 | ||
740 | return home_path; | |
741 | } | |
742 | ||
743 | /* | |
744 | * set_socket_perms | |
745 | * | |
746 | * Set the tracing group gid onto the client socket. | |
747 | */ | |
748 | static int set_socket_perms(void) | |
749 | { | |
750 | int ret; | |
751 | struct group *grp; | |
752 | ||
753 | /* Decide which group name to use */ | |
754 | (opt_tracing_group != NULL) ? | |
755 | (grp = getgrnam(opt_tracing_group)) : | |
756 | (grp = getgrnam(default_tracing_group)); | |
757 | ||
758 | if (grp == NULL) { | |
75462a81 | 759 | ERR("Missing tracing group. Aborting execution.\n"); |
fac6795d DG |
760 | ret = -1; |
761 | goto end; | |
762 | } | |
763 | ||
764 | ret = chown(client_unix_sock_path, 0, grp->gr_gid); | |
765 | if (ret < 0) { | |
766 | perror("chown"); | |
767 | } | |
768 | ||
769 | end: | |
770 | return ret; | |
771 | } | |
772 | ||
fac6795d | 773 | /* |
62bd06d8 | 774 | * set_signal_handler |
fac6795d | 775 | * |
62bd06d8 | 776 | * Setup signal handler for : |
fac6795d DG |
777 | * SIGINT, SIGTERM, SIGPIPE |
778 | */ | |
779 | static int set_signal_handler(void) | |
780 | { | |
781 | int ret = 0; | |
782 | struct sigaction sa; | |
783 | sigset_t sigset; | |
784 | ||
785 | if ((ret = sigemptyset(&sigset)) < 0) { | |
786 | perror("sigemptyset"); | |
787 | return ret; | |
788 | } | |
789 | ||
790 | sa.sa_handler = sighandler; | |
791 | sa.sa_mask = sigset; | |
792 | sa.sa_flags = 0; | |
793 | if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) { | |
794 | perror("sigaction"); | |
795 | return ret; | |
796 | } | |
797 | ||
798 | if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) { | |
799 | perror("sigaction"); | |
800 | return ret; | |
801 | } | |
802 | ||
803 | if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) { | |
804 | perror("sigaction"); | |
805 | return ret; | |
806 | } | |
807 | ||
808 | return ret; | |
809 | } | |
810 | ||
811 | /** | |
62bd06d8 | 812 | * sighandler |
fac6795d | 813 | * |
62bd06d8 | 814 | * Signal handler for the daemon |
fac6795d DG |
815 | */ |
816 | static void sighandler(int sig) | |
817 | { | |
818 | switch (sig) { | |
819 | case SIGPIPE: | |
87378cf5 | 820 | return; |
fac6795d DG |
821 | case SIGINT: |
822 | case SIGTERM: | |
823 | cleanup(); | |
686204ab | 824 | break; |
fac6795d DG |
825 | default: |
826 | break; | |
827 | } | |
828 | ||
829 | exit(EXIT_SUCCESS); | |
830 | } | |
831 | ||
832 | /* | |
62bd06d8 | 833 | * cleanup |
fac6795d | 834 | * |
62bd06d8 | 835 | * Cleanup the daemon on exit |
fac6795d DG |
836 | */ |
837 | static void cleanup() | |
838 | { | |
839 | /* <fun> */ | |
b716ce68 DG |
840 | MSG("\n%c[%d;%dm*** assert failed *** ==> %c[%dm", 27,1,31,27,0); |
841 | MSG("%c[%d;%dmMatthew, BEET driven development works!%c[%dm",27,1,33,27,0); | |
fac6795d DG |
842 | /* </fun> */ |
843 | ||
844 | unlink(client_unix_sock_path); | |
845 | unlink(apps_unix_sock_path); | |
846 | } | |
847 | ||
848 | /* | |
849 | * main | |
850 | */ | |
851 | int main(int argc, char **argv) | |
852 | { | |
853 | int i; | |
854 | int ret = 0; | |
855 | void *status; | |
856 | pthread_t threads[2]; | |
857 | ||
858 | /* Parse arguments */ | |
859 | progname = argv[0]; | |
860 | if ((ret = parse_args(argc, argv) < 0)) { | |
861 | goto error; | |
862 | } | |
863 | ||
864 | /* Daemonize */ | |
865 | if (opt_daemon) { | |
53094c05 DG |
866 | ret = daemon(0, 0); |
867 | if (ret < 0) { | |
868 | perror("daemon"); | |
869 | goto error; | |
870 | } | |
fac6795d DG |
871 | } |
872 | ||
873 | /* Check if daemon is UID = 0 */ | |
874 | is_root = !getuid(); | |
875 | ||
876 | /* Set all sockets path */ | |
877 | if (is_root) { | |
878 | if (strlen(apps_unix_sock_path) == 0) { | |
879 | (snprintf(apps_unix_sock_path, PATH_MAX, | |
880 | DEFAULT_GLOBAL_APPS_UNIX_SOCK)); | |
881 | } | |
882 | ||
883 | if (strlen(client_unix_sock_path) == 0) { | |
884 | (snprintf(client_unix_sock_path, PATH_MAX, | |
885 | DEFAULT_GLOBAL_CLIENT_UNIX_SOCK)); | |
886 | } | |
887 | } else { | |
888 | if (strlen(apps_unix_sock_path) == 0) { | |
889 | (snprintf(apps_unix_sock_path, PATH_MAX, | |
890 | DEFAULT_HOME_APPS_UNIX_SOCK, get_home_dir())); | |
891 | } | |
892 | ||
893 | /* Set the cli tool unix socket path */ | |
894 | if (strlen(client_unix_sock_path) == 0) { | |
895 | (snprintf(client_unix_sock_path, PATH_MAX, | |
896 | DEFAULT_HOME_CLIENT_UNIX_SOCK, get_home_dir())); | |
897 | } | |
898 | } | |
899 | ||
900 | /* See if daemon already exist. If any of the two | |
901 | * socket needed by the daemon are present, this test fails | |
902 | */ | |
903 | if ((ret = check_existing_daemon()) == 0) { | |
75462a81 | 904 | ERR("Already running daemon.\n"); |
ab118b20 DG |
905 | /* We do not goto error because we must not |
906 | * cleanup() because a daemon is already working. | |
907 | */ | |
908 | return EXIT_FAILURE; | |
fac6795d DG |
909 | } |
910 | ||
911 | if (set_signal_handler() < 0) { | |
912 | goto error; | |
913 | } | |
914 | ||
915 | /* Setup the two needed unix socket */ | |
916 | if (init_daemon_socket() < 0) { | |
917 | goto error; | |
918 | } | |
919 | ||
920 | /* Set credentials to socket */ | |
921 | if (is_root && (set_socket_perms() < 0)) { | |
922 | goto error; | |
923 | } | |
924 | ||
5b8719f5 DG |
925 | /* Get parent pid if -S, --sig-parent is specified. */ |
926 | if (opt_sig_parent) { | |
927 | ppid = getppid(); | |
928 | } | |
929 | ||
fac6795d DG |
930 | while (1) { |
931 | /* Create thread to manage the client socket */ | |
932 | ret = pthread_create(&threads[0], NULL, thread_manage_clients, (void *) NULL); | |
933 | if (ret != 0) { | |
934 | perror("pthread_create"); | |
935 | goto error; | |
936 | } | |
937 | ||
938 | /* Create thread to manage application socket */ | |
939 | ret = pthread_create(&threads[1], NULL, thread_manage_apps, (void *) NULL); | |
940 | if (ret != 0) { | |
941 | perror("pthread_create"); | |
942 | goto error; | |
943 | } | |
944 | ||
945 | for (i = 0; i < 2; i++) { | |
946 | ret = pthread_join(threads[i], &status); | |
947 | if (ret != 0) { | |
948 | perror("pthread_join"); | |
949 | goto error; | |
950 | } | |
951 | } | |
952 | } | |
953 | ||
954 | cleanup(); | |
955 | return 0; | |
956 | ||
957 | error: | |
958 | cleanup(); | |
959 | ||
960 | return EXIT_FAILURE; | |
961 | } |