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. | |
8 | * | |
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. | |
13 | * | |
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" |
fac6795d | 43 | |
75462a81 | 44 | /* Const values */ |
686204ab MD |
45 | const char default_home_dir[] = DEFAULT_HOME_DIR; |
46 | const char default_tracing_group[] = DEFAULT_TRACING_GROUP; | |
47 | const char default_ust_sock_dir[] = DEFAULT_UST_SOCK_DIR; | |
48 | const char default_global_apps_pipe[] = DEFAULT_GLOBAL_APPS_PIPE; | |
49 | ||
fac6795d DG |
50 | /* Static functions */ |
51 | static int set_signal_handler(void); | |
52 | static int set_socket_perms(void); | |
53 | static void sighandler(int); | |
fac6795d | 54 | static void cleanup(void); |
e065084a | 55 | static void copy_common_data(struct lttcomm_lttng_msg *llm, struct lttcomm_session_msg *lsm); |
fac6795d DG |
56 | static int check_existing_daemon(void); |
57 | static int notify_apps(const char*); | |
58 | static int connect_app(pid_t); | |
59 | static int init_daemon_socket(void); | |
e065084a DG |
60 | static int process_client_msg(int sock, struct lttcomm_session_msg*); |
61 | static int send_unix_sock(int sock, void *buf, size_t len); | |
ca95a216 DG |
62 | |
63 | /* Command function */ | |
64 | static void get_list_apps(void *buf); | |
65 | static void get_list_sessions(void *buf); | |
fac6795d DG |
66 | |
67 | static void *thread_manage_clients(void *); | |
68 | static void *thread_manage_apps(void *); | |
69 | ||
70 | static int create_session(const char*, uuid_t *); | |
71 | static void destroy_session(uuid_t); | |
72 | ||
73 | static struct ltt_session *find_session(uuid_t); | |
74 | ||
75 | /* Variables */ | |
76 | const char *progname; | |
77 | const char *opt_tracing_group; | |
5b8719f5 | 78 | static int opt_sig_parent; |
fac6795d | 79 | static int opt_daemon; |
75462a81 DG |
80 | int opt_verbose; |
81 | int opt_quiet; | |
fac6795d | 82 | static int is_root; /* Set to 1 if the daemon is running as root */ |
5b8719f5 | 83 | static pid_t ppid; |
fac6795d DG |
84 | |
85 | static char apps_unix_sock_path[PATH_MAX]; /* Global application Unix socket path */ | |
86 | static char client_unix_sock_path[PATH_MAX]; /* Global client Unix socket path */ | |
87 | ||
88 | static int client_socket; | |
89 | static int apps_socket; | |
90 | ||
91 | static struct ltt_session *current_session; | |
e065084a DG |
92 | |
93 | /* Number of element for the list below. */ | |
94 | static unsigned int session_count; | |
95 | static unsigned int traceable_app_count; | |
fac6795d DG |
96 | |
97 | /* Init session's list */ | |
98 | static struct ltt_session_list ltt_session_list = { | |
99 | .head = CDS_LIST_HEAD_INIT(ltt_session_list.head), | |
100 | }; | |
101 | ||
e065084a | 102 | /* Init ust traceabl application's list */ |
fac6795d DG |
103 | static struct ltt_traceable_app_list ltt_traceable_app_list = { |
104 | .head = CDS_LIST_HEAD_INIT(ltt_traceable_app_list.head), | |
105 | }; | |
106 | ||
107 | /* | |
108 | * thread_manage_apps | |
109 | * | |
110 | * This thread manage the application socket communication | |
111 | */ | |
112 | static void *thread_manage_apps(void *data) | |
113 | { | |
114 | int sock, ret; | |
115 | struct ltt_traceable_app *lta; | |
116 | ||
117 | /* TODO: Something more elegant is needed but fine for now */ | |
686204ab | 118 | struct { |
fac6795d | 119 | int reg; /* 1:register, 0:unregister */ |
686204ab MD |
120 | pid_t pid; |
121 | uid_t uid; | |
122 | } reg_msg; | |
fac6795d DG |
123 | |
124 | /* Notify all applications to register */ | |
125 | notify_apps(default_global_apps_pipe); | |
126 | ||
127 | ret = lttcomm_listen_unix_sock(apps_socket); | |
128 | if (ret < 0) { | |
129 | goto error; | |
130 | } | |
131 | ||
132 | while (1) { | |
133 | /* Blocking call, waiting for transmission */ | |
134 | sock = lttcomm_accept_unix_sock(apps_socket); | |
135 | if (sock < 0) { | |
136 | goto error; | |
137 | } | |
138 | ||
139 | /* Basic recv here to handle the very simple data | |
140 | * that the libust send to register (reg_msg). | |
141 | */ | |
142 | ret = recv(sock, ®_msg, sizeof(reg_msg), 0); | |
143 | if (ret < 0) { | |
144 | perror("recv"); | |
145 | continue; | |
146 | } | |
147 | ||
148 | /* Add application to the global traceable list */ | |
149 | if (reg_msg.reg == 1) { | |
150 | /* Registering */ | |
151 | lta = malloc(sizeof(struct ltt_traceable_app)); | |
152 | lta->pid = reg_msg.pid; | |
153 | lta->uid = reg_msg.uid; | |
154 | cds_list_add(<a->list, <t_traceable_app_list.head); | |
e065084a | 155 | traceable_app_count++; |
fac6795d DG |
156 | } else { |
157 | /* Unregistering */ | |
158 | lta = NULL; | |
159 | cds_list_for_each_entry(lta, <t_traceable_app_list.head, list) { | |
160 | if (lta->pid == reg_msg.pid && lta->uid == reg_msg.uid) { | |
161 | cds_list_del(<a->list); | |
e065084a DG |
162 | /* Check to not overflow here */ |
163 | if (traceable_app_count != 0) { | |
164 | traceable_app_count--; | |
165 | } | |
fac6795d DG |
166 | break; |
167 | } | |
168 | } | |
169 | ||
170 | /* If an item was found, free it from memory */ | |
171 | if (lta) { | |
172 | free(lta); | |
173 | } | |
174 | } | |
175 | } | |
176 | ||
177 | error: | |
178 | ||
179 | return NULL; | |
180 | } | |
181 | ||
182 | /* | |
183 | * thread_manage_clients | |
184 | * | |
185 | * This thread manage all clients request using the unix | |
186 | * client socket for communication. | |
187 | */ | |
188 | static void *thread_manage_clients(void *data) | |
189 | { | |
190 | int sock, ret; | |
191 | struct lttcomm_session_msg lsm; | |
fac6795d DG |
192 | |
193 | ret = lttcomm_listen_unix_sock(client_socket); | |
194 | if (ret < 0) { | |
195 | goto error; | |
196 | } | |
197 | ||
5b8719f5 DG |
198 | /* Notify parent pid that we are ready |
199 | * to accept command for client side. | |
200 | */ | |
201 | if (opt_sig_parent) { | |
202 | kill(ppid, SIGCHLD); | |
203 | } | |
204 | ||
fac6795d DG |
205 | while (1) { |
206 | /* Blocking call, waiting for transmission */ | |
207 | sock = lttcomm_accept_unix_sock(client_socket); | |
208 | if (sock < 0) { | |
209 | goto error; | |
210 | } | |
211 | ||
212 | /* | |
213 | * Data is received from the lttng client. The struct | |
214 | * lttcomm_session_msg (lsm) contains the command and data | |
215 | * request of the client. | |
216 | */ | |
217 | ret = lttcomm_recv_unix_sock(sock, &lsm, sizeof(lsm)); | |
218 | if (ret < 0) { | |
219 | continue; | |
220 | } | |
221 | ||
222 | /* This function dispatch the work to the LTTng or UST libs | |
e065084a DG |
223 | * and then sends back the response to the client. This is needed |
224 | * because there might be more then one lttcomm_lttng_msg to | |
225 | * send out so process_client_msg do both jobs. | |
fac6795d | 226 | */ |
e065084a DG |
227 | ret = process_client_msg(sock, &lsm); |
228 | if (ret < 0) { | |
229 | /* Error detected but still accept command */ | |
230 | continue; | |
fac6795d DG |
231 | } |
232 | } | |
233 | ||
234 | error: | |
235 | return NULL; | |
236 | } | |
237 | ||
e065084a DG |
238 | /* |
239 | * send_unix_sock | |
240 | * | |
241 | * Send data on a unix socket using the liblttsessiondcomm API. | |
242 | * | |
243 | * Return lttcomm error code. | |
244 | */ | |
245 | static int send_unix_sock(int sock, void *buf, size_t len) | |
246 | { | |
247 | /* Check valid length */ | |
248 | if (len <= 0) { | |
249 | return -1; | |
250 | } | |
251 | ||
252 | return lttcomm_send_unix_sock(sock, buf, len); | |
253 | } | |
254 | ||
fac6795d DG |
255 | /* |
256 | * connect_app | |
257 | * | |
258 | * Return a socket connected to the libust communication socket | |
259 | * of the application identified by the pid. | |
260 | */ | |
261 | static int connect_app(pid_t pid) | |
262 | { | |
263 | int sock; | |
264 | ||
265 | sock = ustctl_connect_pid(pid); | |
266 | if (sock < 0) { | |
75462a81 | 267 | ERR("Fail connecting to the PID %d\n", pid); |
fac6795d DG |
268 | } |
269 | ||
270 | return sock; | |
271 | } | |
272 | ||
273 | /* | |
274 | * notify_apps | |
275 | * | |
276 | * Notify apps by writing 42 to a named pipe using name. | |
277 | * Every applications waiting for a ltt-sessiond will be notified | |
278 | * and re-register automatically to the session daemon. | |
279 | * | |
280 | * Return open or write error value. | |
281 | */ | |
282 | static int notify_apps(const char *name) | |
283 | { | |
284 | int fd; | |
285 | int ret = -1; | |
286 | ||
287 | /* Try opening the global pipe */ | |
288 | fd = open(name, O_WRONLY); | |
289 | if (fd < 0) { | |
290 | goto error; | |
291 | } | |
292 | ||
293 | /* Notify by writing on the pipe */ | |
294 | ret = write(fd, "42", 2); | |
295 | if (ret < 0) { | |
296 | perror("write"); | |
297 | } | |
298 | ||
299 | error: | |
300 | return ret; | |
301 | } | |
302 | ||
303 | /* | |
304 | * find_session | |
305 | * | |
306 | * Return a ltt_session structure ptr that matches the uuid. | |
307 | */ | |
308 | static struct ltt_session *find_session(uuid_t session_id) | |
309 | { | |
310 | struct ltt_session *iter = NULL; | |
311 | ||
312 | /* Sanity check for NULL session_id */ | |
313 | if (uuid_is_null(session_id)) { | |
314 | goto end; | |
315 | } | |
316 | ||
317 | cds_list_for_each_entry(iter, <t_session_list.head, list) { | |
318 | if (uuid_compare(iter->uuid, session_id)) { | |
319 | break; | |
320 | } | |
321 | } | |
322 | ||
323 | end: | |
324 | return iter; | |
325 | } | |
326 | ||
327 | /* | |
328 | * destroy_session | |
329 | * | |
330 | * Delete session from the global session list | |
331 | * and free the memory. | |
332 | */ | |
333 | static void destroy_session(uuid_t session_id) | |
334 | { | |
335 | struct ltt_session *iter = NULL; | |
336 | ||
337 | cds_list_for_each_entry(iter, <t_session_list.head, list) { | |
338 | if (uuid_compare(iter->uuid, session_id)) { | |
339 | cds_list_del(&iter->list); | |
340 | break; | |
341 | } | |
342 | } | |
343 | ||
344 | if (iter) { | |
345 | free(iter); | |
346 | session_count--; | |
347 | } | |
348 | } | |
349 | ||
350 | /* | |
351 | * create_session | |
352 | * | |
353 | * Create a brand new session, | |
354 | */ | |
355 | static int create_session(const char *name, uuid_t *session_id) | |
356 | { | |
357 | struct ltt_session *new_session; | |
358 | ||
359 | /* Allocate session data structure */ | |
360 | new_session = malloc(sizeof(struct ltt_session)); | |
361 | if (new_session == NULL) { | |
362 | perror("malloc"); | |
363 | goto error; | |
364 | } | |
365 | ||
366 | if (name != NULL) { | |
367 | if (asprintf(&new_session->name, "%s", name) < 0) { | |
368 | goto error; | |
369 | } | |
370 | } else { | |
371 | /* Generate session name based on the session count */ | |
372 | if (asprintf(&new_session->name, "%s%d", "auto", session_count) < 0) { | |
373 | goto error; | |
374 | } | |
375 | } | |
376 | ||
377 | /* UUID generation */ | |
378 | uuid_generate(new_session->uuid); | |
379 | uuid_copy(*session_id, new_session->uuid); | |
380 | ||
381 | /* Set consumer (identifier) to 0. This means that there is | |
382 | * NO consumer attach to that session yet. | |
383 | */ | |
384 | new_session->ust_consumer = 0; | |
385 | new_session->lttng_consumer = 0; | |
386 | ||
387 | /* Init list */ | |
388 | CDS_INIT_LIST_HEAD(&new_session->ust_traces); | |
389 | CDS_INIT_LIST_HEAD(&new_session->lttng_traces); | |
390 | ||
391 | /* Add new session to the global session list */ | |
392 | cds_list_add(&new_session->list, <t_session_list.head); | |
393 | ||
394 | session_count++; | |
395 | ||
396 | return 0; | |
397 | ||
398 | error: | |
399 | return -1; | |
400 | } | |
401 | ||
402 | /* | |
ca95a216 | 403 | * get_list_apps |
fac6795d DG |
404 | * |
405 | * List traceable user-space application and fill an | |
406 | * array of pids. | |
fac6795d | 407 | */ |
ca95a216 | 408 | static void get_list_apps(void *buf) |
fac6795d | 409 | { |
ca95a216 | 410 | size_t index = 0; |
fac6795d | 411 | struct ltt_traceable_app *iter = NULL; |
ca95a216 | 412 | pid_t *pids = (pid_t *) buf; |
fac6795d | 413 | |
e065084a DG |
414 | /* TODO: Mutex needed to access this list */ |
415 | cds_list_for_each_entry(iter, <t_traceable_app_list.head, list) { | |
ca95a216 DG |
416 | pids[index] = iter->pid; |
417 | index++; | |
fac6795d | 418 | } |
ca95a216 | 419 | } |
fac6795d | 420 | |
ca95a216 DG |
421 | /* |
422 | * get_list_sessions | |
423 | * | |
424 | * List sessions and fill the data buffer. | |
425 | */ | |
426 | static void get_list_sessions(void *buf) | |
427 | { | |
428 | int i = 0; | |
429 | struct ltt_session *iter = NULL; | |
430 | struct lttng_session lsess; | |
431 | struct lttng_session *data = (struct lttng_session *) buf; | |
e065084a | 432 | |
ca95a216 DG |
433 | /* Iterate over session list and append data after |
434 | * the control struct in the buffer. | |
435 | */ | |
436 | cds_list_for_each_entry(iter, <t_session_list.head, list) { | |
437 | uuid_unparse(iter->uuid, lsess.uuid); | |
438 | strncpy(lsess.name, iter->name, sizeof(lsess.name)); | |
439 | memcpy(data + (i * sizeof(struct lttng_session)), &lsess, sizeof(lsess)); | |
440 | i++; | |
441 | /* Reset struct for next pass */ | |
442 | memset(&lsess, 0, sizeof(lsess)); | |
443 | } | |
fac6795d DG |
444 | } |
445 | ||
e065084a DG |
446 | /* |
447 | * copy_common_data | |
448 | * | |
449 | * Copy common data between lttcomm_lttng_msg and lttcomm_session_msg | |
450 | */ | |
451 | static void copy_common_data(struct lttcomm_lttng_msg *llm, struct lttcomm_session_msg *lsm) | |
452 | { | |
453 | llm->cmd_type = lsm->cmd_type; | |
454 | llm->pid = lsm->pid; | |
455 | if (!uuid_is_null(lsm->session_id)) { | |
456 | uuid_copy(llm->session_id, lsm->session_id); | |
457 | } | |
458 | strncpy(llm->trace_name, lsm->trace_name, sizeof(llm->trace_name)); | |
459 | } | |
460 | ||
ca95a216 DG |
461 | /* |
462 | * setup_data_buffer | |
463 | * | |
464 | * Setup the outgoing data buffer for the response | |
465 | * data allocating the right amount of memory. | |
466 | * | |
467 | * Return total size of the buffer pointed by buf. | |
468 | */ | |
469 | static int setup_data_buffer(void **buf, size_t s_data, struct lttcomm_lttng_msg *llm) | |
470 | { | |
471 | int ret = 0; | |
472 | void *new_buf; | |
473 | size_t buf_size; | |
474 | ||
475 | buf_size = sizeof(struct lttcomm_lttng_msg) + s_data; | |
476 | new_buf = malloc(buf_size); | |
477 | if (new_buf == NULL) { | |
478 | perror("malloc"); | |
479 | ret = -1; | |
480 | goto error; | |
481 | } | |
482 | ||
483 | /* Setup lttcomm_lttng_msg data and copy | |
484 | * it to the newly allocated buffer. | |
485 | */ | |
486 | llm->size_payload = s_data; | |
487 | memcpy(new_buf, llm, sizeof(struct lttcomm_lttng_msg)); | |
488 | ||
489 | *buf = new_buf; | |
490 | ||
491 | return buf_size; | |
492 | ||
493 | error: | |
494 | return ret; | |
495 | } | |
496 | ||
fac6795d DG |
497 | /* |
498 | * process_client_msg | |
499 | * | |
500 | * This takes the lttcomm_session_msg struct and process the command requested | |
e065084a DG |
501 | * by the client. It then creates response(s) and send it back to the |
502 | * given socket (sock). | |
fac6795d | 503 | * |
e065084a | 504 | * Return any error encountered or 0 for success. |
fac6795d | 505 | */ |
e065084a | 506 | static int process_client_msg(int sock, struct lttcomm_session_msg *lsm) |
fac6795d | 507 | { |
e065084a DG |
508 | int ret; |
509 | struct lttcomm_lttng_msg llm; | |
ca95a216 DG |
510 | void *send_buf = NULL; |
511 | int buf_size; | |
fac6795d DG |
512 | |
513 | /* Copy common data to identify the response | |
514 | * on the lttng client side. | |
515 | */ | |
e065084a | 516 | copy_common_data(&llm, lsm); |
fac6795d DG |
517 | |
518 | /* Default return code. | |
e065084a | 519 | * In our world, everything is OK... right? ;) |
fac6795d | 520 | */ |
e065084a | 521 | llm.ret_code = LTTCOMM_OK; |
fac6795d DG |
522 | |
523 | /* Process by command type */ | |
524 | switch (lsm->cmd_type) { | |
525 | case UST_LIST_APPS: | |
526 | { | |
ca95a216 DG |
527 | /* Stop right now if no apps */ |
528 | if (traceable_app_count == 0) { | |
e065084a DG |
529 | ret = LTTCOMM_NO_APPS; |
530 | goto error; | |
531 | } | |
532 | ||
ca95a216 DG |
533 | /* Setup data buffer and details for transmission */ |
534 | buf_size = setup_data_buffer(&send_buf, | |
535 | sizeof(pid_t) * traceable_app_count, &llm); | |
536 | if (buf_size < 0) { | |
537 | ret = LTTCOMM_FATAL; | |
538 | goto error; | |
539 | } | |
540 | ||
541 | get_list_apps(send_buf + sizeof(struct lttcomm_lttng_msg)); | |
542 | ||
543 | ret = send_unix_sock(sock, send_buf, buf_size); | |
544 | if (ret < 0) { | |
545 | goto send_error; | |
e065084a | 546 | } |
e065084a | 547 | |
fac6795d DG |
548 | break; |
549 | } | |
57167058 DG |
550 | case LTTNG_LIST_SESSIONS: |
551 | { | |
ca95a216 DG |
552 | /* Stop right now if no session */ |
553 | if (session_count == 0) { | |
57167058 DG |
554 | ret = LTTCOMM_NO_SESS; |
555 | goto error; | |
556 | } | |
557 | ||
ca95a216 DG |
558 | /* Setup data buffer and details for transmission */ |
559 | buf_size = setup_data_buffer(&send_buf, | |
560 | (sizeof(struct lttng_session) * session_count), &llm); | |
561 | if (buf_size < 0) { | |
562 | ret = LTTCOMM_FATAL; | |
563 | goto error; | |
564 | } | |
565 | ||
566 | get_list_sessions(send_buf + sizeof(struct lttcomm_lttng_msg)); | |
567 | ||
568 | ret = send_unix_sock(sock, send_buf, buf_size); | |
569 | if (ret < 0) { | |
570 | goto send_error; | |
57167058 DG |
571 | } |
572 | ||
573 | break; | |
574 | } | |
fac6795d | 575 | default: |
e065084a | 576 | { |
fac6795d | 577 | /* Undefined command */ |
e065084a | 578 | ret = LTTCOMM_UND; |
ca95a216 | 579 | goto error; |
e065084a | 580 | } |
fac6795d DG |
581 | } |
582 | ||
ca95a216 DG |
583 | if (send_buf != NULL) { |
584 | free(send_buf); | |
585 | } | |
586 | ||
e065084a DG |
587 | return 0; |
588 | ||
589 | send_error: | |
590 | return ret; | |
591 | ||
592 | error: | |
593 | /* Notify client of error */ | |
594 | llm.ret_code = ret; | |
ca95a216 | 595 | llm.size_payload = 0; |
e065084a DG |
596 | send_unix_sock(sock, (void*) &llm, sizeof(llm)); |
597 | ||
598 | return -1; | |
fac6795d DG |
599 | } |
600 | ||
601 | /* | |
602 | * usage function on stderr | |
603 | */ | |
604 | static void usage(void) | |
605 | { | |
606 | fprintf(stderr, "Usage:\n%s OPTIONS\n\nOptions:\n" | |
607 | "\t-h, --help\t\tDisplay this usage.\n" | |
608 | "\t-c, --client-sock PATH\t\tSpecify path for the client unix socket\n" | |
609 | "\t-a, --apps-sock PATH\t\tSpecify path for apps unix socket.\n" | |
610 | "\t-d, --daemonize\t\tStart as a daemon.\n" | |
611 | "\t-g, --group NAME\t\tSpecify the tracing group name. (default: tracing)\n" | |
5b8719f5 | 612 | "\t-V, --version\t\tShow version number.\n" |
75462a81 DG |
613 | "\t-S, --sig-parent\t\tSend SIGCHLD to parent pid to notify readiness.\n" |
614 | "\t-q, --quiet\t\tNo output at all.\n", | |
fac6795d DG |
615 | progname); |
616 | } | |
617 | ||
618 | /* | |
619 | * daemon argument parsing | |
620 | */ | |
621 | static int parse_args(int argc, char **argv) | |
622 | { | |
623 | int c; | |
624 | ||
625 | static struct option long_options[] = { | |
626 | { "client-sock", 1, 0, 'c' }, | |
627 | { "apps-sock", 1, 0, 'a' }, | |
628 | { "daemonize", 0, 0, 'd' }, | |
5b8719f5 | 629 | { "sig-parent", 0, 0, 'S' }, |
fac6795d DG |
630 | { "help", 0, 0, 'h' }, |
631 | { "group", 1, 0, 'g' }, | |
632 | { "version", 0, 0, 'V' }, | |
75462a81 | 633 | { "quiet", 0, 0, 'q' }, |
fac6795d DG |
634 | { NULL, 0, 0, 0 } |
635 | }; | |
636 | ||
637 | while (1) { | |
638 | int option_index = 0; | |
75462a81 | 639 | c = getopt_long(argc, argv, "dhqVS" "a:c:g:s:", long_options, &option_index); |
fac6795d DG |
640 | if (c == -1) { |
641 | break; | |
642 | } | |
643 | ||
644 | switch (c) { | |
645 | case 0: | |
646 | fprintf(stderr, "option %s", long_options[option_index].name); | |
647 | if (optarg) { | |
648 | fprintf(stderr, " with arg %s\n", optarg); | |
649 | } | |
650 | break; | |
651 | case 's': | |
652 | snprintf(client_unix_sock_path, PATH_MAX, "%s", optarg); | |
653 | break; | |
654 | case 'a': | |
655 | snprintf(apps_unix_sock_path, PATH_MAX, "%s", optarg); | |
656 | break; | |
657 | case 'd': | |
658 | opt_daemon = 1; | |
659 | break; | |
660 | case 'g': | |
661 | opt_tracing_group = strdup(optarg); | |
662 | break; | |
663 | case 'h': | |
664 | usage(); | |
665 | exit(EXIT_FAILURE); | |
666 | case 'V': | |
667 | fprintf(stdout, "%s\n", VERSION); | |
668 | exit(EXIT_SUCCESS); | |
5b8719f5 DG |
669 | case 'S': |
670 | opt_sig_parent = 1; | |
671 | break; | |
75462a81 DG |
672 | case 'q': |
673 | opt_quiet = 1; | |
674 | break; | |
fac6795d DG |
675 | default: |
676 | /* Unknown option or other error. | |
677 | * Error is printed by getopt, just return */ | |
678 | return -1; | |
679 | } | |
680 | } | |
681 | ||
682 | return 0; | |
683 | } | |
684 | ||
685 | /* | |
686 | * init_daemon_socket | |
687 | * | |
688 | * Creates the two needed socket by the daemon. | |
689 | * apps_socket - The communication socket for all UST apps. | |
690 | * client_socket - The communication of the cli tool (lttng). | |
691 | */ | |
692 | static int init_daemon_socket() | |
693 | { | |
694 | int ret = 0; | |
695 | mode_t old_umask; | |
696 | ||
697 | old_umask = umask(0); | |
698 | ||
699 | /* Create client tool unix socket */ | |
700 | client_socket = lttcomm_create_unix_sock(client_unix_sock_path); | |
701 | if (client_socket < 0) { | |
702 | ret = -1; | |
703 | goto end; | |
704 | } | |
705 | ||
706 | /* File permission MUST be 660 */ | |
707 | ret = chmod(client_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); | |
708 | if (ret < 0) { | |
709 | perror("chmod"); | |
710 | goto end; | |
711 | } | |
712 | ||
713 | /* Create the application unix socket */ | |
714 | apps_socket = lttcomm_create_unix_sock(apps_unix_sock_path); | |
715 | if (apps_socket < 0) { | |
716 | ret = -1; | |
717 | goto end; | |
718 | } | |
719 | ||
720 | /* File permission MUST be 660 */ | |
721 | ret = chmod(apps_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH); | |
722 | if (ret < 0) { | |
723 | perror("chmod"); | |
724 | goto end; | |
725 | } | |
726 | ||
727 | end: | |
728 | umask(old_umask); | |
729 | return ret; | |
730 | } | |
731 | ||
732 | /* | |
733 | * check_existing_daemon | |
734 | * | |
735 | * Check if the global socket is available. | |
736 | * If yes, error is returned. | |
737 | */ | |
738 | static int check_existing_daemon() | |
739 | { | |
740 | int ret; | |
741 | ||
742 | ret = access(client_unix_sock_path, F_OK); | |
743 | if (ret == 0) { | |
744 | ret = access(apps_unix_sock_path, F_OK); | |
745 | } | |
746 | ||
747 | return ret; | |
748 | } | |
749 | ||
750 | /* | |
751 | * get_home_dir | |
752 | * | |
753 | * Return pointer to home directory path using | |
754 | * the env variable HOME. | |
755 | * | |
756 | * Default : /tmp | |
757 | */ | |
758 | static const char *get_home_dir(void) | |
759 | { | |
760 | const char *home_path; | |
761 | ||
686204ab | 762 | if ((home_path = (const char *) getenv("HOME")) == NULL) { |
fac6795d DG |
763 | home_path = default_home_dir; |
764 | } | |
765 | ||
766 | return home_path; | |
767 | } | |
768 | ||
769 | /* | |
770 | * set_socket_perms | |
771 | * | |
772 | * Set the tracing group gid onto the client socket. | |
773 | */ | |
774 | static int set_socket_perms(void) | |
775 | { | |
776 | int ret; | |
777 | struct group *grp; | |
778 | ||
779 | /* Decide which group name to use */ | |
780 | (opt_tracing_group != NULL) ? | |
781 | (grp = getgrnam(opt_tracing_group)) : | |
782 | (grp = getgrnam(default_tracing_group)); | |
783 | ||
784 | if (grp == NULL) { | |
75462a81 | 785 | ERR("Missing tracing group. Aborting execution.\n"); |
fac6795d DG |
786 | ret = -1; |
787 | goto end; | |
788 | } | |
789 | ||
790 | ret = chown(client_unix_sock_path, 0, grp->gr_gid); | |
791 | if (ret < 0) { | |
792 | perror("chown"); | |
793 | } | |
794 | ||
795 | end: | |
796 | return ret; | |
797 | } | |
798 | ||
fac6795d DG |
799 | /* |
800 | * set_signal_handler | |
801 | * | |
802 | * Setup signal handler for : | |
803 | * SIGINT, SIGTERM, SIGPIPE | |
804 | */ | |
805 | static int set_signal_handler(void) | |
806 | { | |
807 | int ret = 0; | |
808 | struct sigaction sa; | |
809 | sigset_t sigset; | |
810 | ||
811 | if ((ret = sigemptyset(&sigset)) < 0) { | |
812 | perror("sigemptyset"); | |
813 | return ret; | |
814 | } | |
815 | ||
816 | sa.sa_handler = sighandler; | |
817 | sa.sa_mask = sigset; | |
818 | sa.sa_flags = 0; | |
819 | if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) { | |
820 | perror("sigaction"); | |
821 | return ret; | |
822 | } | |
823 | ||
824 | if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) { | |
825 | perror("sigaction"); | |
826 | return ret; | |
827 | } | |
828 | ||
829 | if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) { | |
830 | perror("sigaction"); | |
831 | return ret; | |
832 | } | |
833 | ||
834 | return ret; | |
835 | } | |
836 | ||
837 | /** | |
838 | * sighandler | |
839 | * | |
840 | * Signal handler for the daemon | |
841 | */ | |
842 | static void sighandler(int sig) | |
843 | { | |
844 | switch (sig) { | |
845 | case SIGPIPE: | |
846 | case SIGINT: | |
847 | case SIGTERM: | |
848 | cleanup(); | |
686204ab | 849 | break; |
fac6795d DG |
850 | default: |
851 | break; | |
852 | } | |
853 | ||
854 | exit(EXIT_SUCCESS); | |
855 | } | |
856 | ||
857 | /* | |
858 | * cleanup | |
859 | * | |
860 | * Cleanup the daemon on exit | |
861 | */ | |
862 | static void cleanup() | |
863 | { | |
864 | /* <fun> */ | |
75462a81 DG |
865 | MSG("\n\n%c[%d;%dm*** assert failed *** ==> %c[%dm", 27,1,31,27,0); |
866 | MSG("%c[%d;%dm Matthew, BEET driven development works!%c[%dm\n",27,1,33,27,0); | |
fac6795d DG |
867 | /* </fun> */ |
868 | ||
869 | unlink(client_unix_sock_path); | |
870 | unlink(apps_unix_sock_path); | |
871 | } | |
872 | ||
873 | /* | |
874 | * main | |
875 | */ | |
876 | int main(int argc, char **argv) | |
877 | { | |
878 | int i; | |
879 | int ret = 0; | |
880 | void *status; | |
881 | pthread_t threads[2]; | |
882 | ||
883 | /* Parse arguments */ | |
884 | progname = argv[0]; | |
885 | if ((ret = parse_args(argc, argv) < 0)) { | |
886 | goto error; | |
887 | } | |
888 | ||
889 | /* Daemonize */ | |
890 | if (opt_daemon) { | |
53094c05 DG |
891 | ret = daemon(0, 0); |
892 | if (ret < 0) { | |
893 | perror("daemon"); | |
894 | goto error; | |
895 | } | |
fac6795d DG |
896 | } |
897 | ||
898 | /* Check if daemon is UID = 0 */ | |
899 | is_root = !getuid(); | |
900 | ||
901 | /* Set all sockets path */ | |
902 | if (is_root) { | |
903 | if (strlen(apps_unix_sock_path) == 0) { | |
904 | (snprintf(apps_unix_sock_path, PATH_MAX, | |
905 | DEFAULT_GLOBAL_APPS_UNIX_SOCK)); | |
906 | } | |
907 | ||
908 | if (strlen(client_unix_sock_path) == 0) { | |
909 | (snprintf(client_unix_sock_path, PATH_MAX, | |
910 | DEFAULT_GLOBAL_CLIENT_UNIX_SOCK)); | |
911 | } | |
912 | } else { | |
913 | if (strlen(apps_unix_sock_path) == 0) { | |
914 | (snprintf(apps_unix_sock_path, PATH_MAX, | |
915 | DEFAULT_HOME_APPS_UNIX_SOCK, get_home_dir())); | |
916 | } | |
917 | ||
918 | /* Set the cli tool unix socket path */ | |
919 | if (strlen(client_unix_sock_path) == 0) { | |
920 | (snprintf(client_unix_sock_path, PATH_MAX, | |
921 | DEFAULT_HOME_CLIENT_UNIX_SOCK, get_home_dir())); | |
922 | } | |
923 | } | |
924 | ||
925 | /* See if daemon already exist. If any of the two | |
926 | * socket needed by the daemon are present, this test fails | |
927 | */ | |
928 | if ((ret = check_existing_daemon()) == 0) { | |
75462a81 | 929 | ERR("Already running daemon.\n"); |
fac6795d DG |
930 | goto error; |
931 | } | |
932 | ||
933 | if (set_signal_handler() < 0) { | |
934 | goto error; | |
935 | } | |
936 | ||
937 | /* Setup the two needed unix socket */ | |
938 | if (init_daemon_socket() < 0) { | |
939 | goto error; | |
940 | } | |
941 | ||
942 | /* Set credentials to socket */ | |
943 | if (is_root && (set_socket_perms() < 0)) { | |
944 | goto error; | |
945 | } | |
946 | ||
5b8719f5 DG |
947 | /* Get parent pid if -S, --sig-parent is specified. */ |
948 | if (opt_sig_parent) { | |
949 | ppid = getppid(); | |
950 | } | |
951 | ||
fac6795d DG |
952 | while (1) { |
953 | /* Create thread to manage the client socket */ | |
954 | ret = pthread_create(&threads[0], NULL, thread_manage_clients, (void *) NULL); | |
955 | if (ret != 0) { | |
956 | perror("pthread_create"); | |
957 | goto error; | |
958 | } | |
959 | ||
960 | /* Create thread to manage application socket */ | |
961 | ret = pthread_create(&threads[1], NULL, thread_manage_apps, (void *) NULL); | |
962 | if (ret != 0) { | |
963 | perror("pthread_create"); | |
964 | goto error; | |
965 | } | |
966 | ||
967 | for (i = 0; i < 2; i++) { | |
968 | ret = pthread_join(threads[i], &status); | |
969 | if (ret != 0) { | |
970 | perror("pthread_join"); | |
971 | goto error; | |
972 | } | |
973 | } | |
974 | } | |
975 | ||
976 | cleanup(); | |
977 | return 0; | |
978 | ||
979 | error: | |
980 | cleanup(); | |
981 | ||
982 | return EXIT_FAILURE; | |
983 | } |