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); | |
1fd70b72 | 53 | static void sighandler(int sig); |
fac6795d | 54 | static void cleanup(void); |
e065084a | 55 | static void copy_common_data(struct lttcomm_lttng_msg *llm, struct lttcomm_session_msg *lsm); |
fac6795d | 56 | static int check_existing_daemon(void); |
1fd70b72 DG |
57 | static int notify_apps(const char* name); |
58 | static int connect_app(pid_t pid); | |
fac6795d | 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); | |
aaf97519 | 62 | static int setup_data_buffer(char **buf, size_t size, struct lttcomm_lttng_msg *llm); |
ca95a216 DG |
63 | |
64 | /* Command function */ | |
aaf97519 DG |
65 | static void get_list_apps(pid_t *pids); |
66 | static void get_list_sessions(struct lttng_session *lt); | |
fac6795d | 67 | |
1fd70b72 DG |
68 | static void *thread_manage_clients(void *data); |
69 | static void *thread_manage_apps(void *data); | |
fac6795d | 70 | |
aaf97519 | 71 | static int create_session(char *name, uuid_t *session_id); |
1fd70b72 | 72 | static void destroy_session(uuid_t session_id); |
fac6795d | 73 | |
1fd70b72 | 74 | static struct ltt_session *find_session(uuid_t session_id); |
fac6795d DG |
75 | |
76 | /* Variables */ | |
77 | const char *progname; | |
78 | const char *opt_tracing_group; | |
5b8719f5 | 79 | static int opt_sig_parent; |
fac6795d | 80 | static int opt_daemon; |
75462a81 DG |
81 | int opt_verbose; |
82 | int opt_quiet; | |
fac6795d | 83 | static int is_root; /* Set to 1 if the daemon is running as root */ |
5b8719f5 | 84 | static pid_t ppid; |
fac6795d DG |
85 | |
86 | static char apps_unix_sock_path[PATH_MAX]; /* Global application Unix socket path */ | |
87 | static char client_unix_sock_path[PATH_MAX]; /* Global client Unix socket path */ | |
88 | ||
89 | static int client_socket; | |
90 | static int apps_socket; | |
91 | ||
92 | static struct ltt_session *current_session; | |
e065084a DG |
93 | |
94 | /* Number of element for the list below. */ | |
95 | static unsigned int session_count; | |
96 | static unsigned int traceable_app_count; | |
fac6795d DG |
97 | |
98 | /* Init session's list */ | |
99 | static struct ltt_session_list ltt_session_list = { | |
100 | .head = CDS_LIST_HEAD_INIT(ltt_session_list.head), | |
101 | }; | |
102 | ||
e065084a | 103 | /* Init ust traceabl application's list */ |
fac6795d DG |
104 | static struct ltt_traceable_app_list ltt_traceable_app_list = { |
105 | .head = CDS_LIST_HEAD_INIT(ltt_traceable_app_list.head), | |
106 | }; | |
107 | ||
108 | /* | |
109 | * thread_manage_apps | |
110 | * | |
111 | * This thread manage the application socket communication | |
112 | */ | |
113 | static void *thread_manage_apps(void *data) | |
114 | { | |
115 | int sock, ret; | |
116 | struct ltt_traceable_app *lta; | |
117 | ||
118 | /* TODO: Something more elegant is needed but fine for now */ | |
686204ab | 119 | struct { |
fac6795d | 120 | int reg; /* 1:register, 0:unregister */ |
686204ab MD |
121 | pid_t pid; |
122 | uid_t uid; | |
123 | } reg_msg; | |
fac6795d DG |
124 | |
125 | /* Notify all applications to register */ | |
126 | notify_apps(default_global_apps_pipe); | |
127 | ||
128 | ret = lttcomm_listen_unix_sock(apps_socket); | |
129 | if (ret < 0) { | |
130 | goto error; | |
131 | } | |
132 | ||
133 | while (1) { | |
134 | /* Blocking call, waiting for transmission */ | |
135 | sock = lttcomm_accept_unix_sock(apps_socket); | |
136 | if (sock < 0) { | |
137 | goto error; | |
138 | } | |
139 | ||
140 | /* Basic recv here to handle the very simple data | |
141 | * that the libust send to register (reg_msg). | |
142 | */ | |
143 | ret = recv(sock, ®_msg, sizeof(reg_msg), 0); | |
144 | if (ret < 0) { | |
145 | perror("recv"); | |
146 | continue; | |
147 | } | |
148 | ||
149 | /* Add application to the global traceable list */ | |
150 | if (reg_msg.reg == 1) { | |
151 | /* Registering */ | |
152 | lta = malloc(sizeof(struct ltt_traceable_app)); | |
153 | lta->pid = reg_msg.pid; | |
154 | lta->uid = reg_msg.uid; | |
155 | cds_list_add(<a->list, <t_traceable_app_list.head); | |
e065084a | 156 | traceable_app_count++; |
fac6795d DG |
157 | } else { |
158 | /* Unregistering */ | |
159 | lta = NULL; | |
160 | cds_list_for_each_entry(lta, <t_traceable_app_list.head, list) { | |
161 | if (lta->pid == reg_msg.pid && lta->uid == reg_msg.uid) { | |
162 | cds_list_del(<a->list); | |
e065084a DG |
163 | /* Check to not overflow here */ |
164 | if (traceable_app_count != 0) { | |
165 | traceable_app_count--; | |
166 | } | |
fac6795d DG |
167 | break; |
168 | } | |
169 | } | |
170 | ||
171 | /* If an item was found, free it from memory */ | |
172 | if (lta) { | |
173 | free(lta); | |
174 | } | |
175 | } | |
176 | } | |
177 | ||
178 | error: | |
179 | ||
180 | return NULL; | |
181 | } | |
182 | ||
183 | /* | |
184 | * thread_manage_clients | |
185 | * | |
186 | * This thread manage all clients request using the unix | |
187 | * client socket for communication. | |
188 | */ | |
189 | static void *thread_manage_clients(void *data) | |
190 | { | |
191 | int sock, ret; | |
192 | struct lttcomm_session_msg lsm; | |
fac6795d DG |
193 | |
194 | ret = lttcomm_listen_unix_sock(client_socket); | |
195 | if (ret < 0) { | |
196 | goto error; | |
197 | } | |
198 | ||
5b8719f5 DG |
199 | /* Notify parent pid that we are ready |
200 | * to accept command for client side. | |
201 | */ | |
202 | if (opt_sig_parent) { | |
203 | kill(ppid, SIGCHLD); | |
204 | } | |
205 | ||
fac6795d DG |
206 | while (1) { |
207 | /* Blocking call, waiting for transmission */ | |
208 | sock = lttcomm_accept_unix_sock(client_socket); | |
209 | if (sock < 0) { | |
210 | goto error; | |
211 | } | |
212 | ||
213 | /* | |
214 | * Data is received from the lttng client. The struct | |
215 | * lttcomm_session_msg (lsm) contains the command and data | |
216 | * request of the client. | |
217 | */ | |
218 | ret = lttcomm_recv_unix_sock(sock, &lsm, sizeof(lsm)); | |
219 | if (ret < 0) { | |
220 | continue; | |
221 | } | |
222 | ||
223 | /* This function dispatch the work to the LTTng or UST libs | |
e065084a DG |
224 | * and then sends back the response to the client. This is needed |
225 | * because there might be more then one lttcomm_lttng_msg to | |
226 | * send out so process_client_msg do both jobs. | |
fac6795d | 227 | */ |
e065084a DG |
228 | ret = process_client_msg(sock, &lsm); |
229 | if (ret < 0) { | |
230 | /* Error detected but still accept command */ | |
231 | continue; | |
fac6795d DG |
232 | } |
233 | } | |
234 | ||
235 | error: | |
236 | return NULL; | |
237 | } | |
238 | ||
e065084a DG |
239 | /* |
240 | * send_unix_sock | |
241 | * | |
242 | * Send data on a unix socket using the liblttsessiondcomm API. | |
243 | * | |
244 | * Return lttcomm error code. | |
245 | */ | |
246 | static int send_unix_sock(int sock, void *buf, size_t len) | |
247 | { | |
248 | /* Check valid length */ | |
249 | if (len <= 0) { | |
250 | return -1; | |
251 | } | |
252 | ||
253 | return lttcomm_send_unix_sock(sock, buf, len); | |
254 | } | |
255 | ||
fac6795d DG |
256 | /* |
257 | * connect_app | |
258 | * | |
259 | * Return a socket connected to the libust communication socket | |
260 | * of the application identified by the pid. | |
261 | */ | |
262 | static int connect_app(pid_t pid) | |
263 | { | |
264 | int sock; | |
265 | ||
266 | sock = ustctl_connect_pid(pid); | |
267 | if (sock < 0) { | |
75462a81 | 268 | ERR("Fail connecting to the PID %d\n", pid); |
fac6795d DG |
269 | } |
270 | ||
271 | return sock; | |
272 | } | |
273 | ||
274 | /* | |
275 | * notify_apps | |
276 | * | |
277 | * Notify apps by writing 42 to a named pipe using name. | |
278 | * Every applications waiting for a ltt-sessiond will be notified | |
279 | * and re-register automatically to the session daemon. | |
280 | * | |
281 | * Return open or write error value. | |
282 | */ | |
283 | static int notify_apps(const char *name) | |
284 | { | |
285 | int fd; | |
286 | int ret = -1; | |
287 | ||
288 | /* Try opening the global pipe */ | |
289 | fd = open(name, O_WRONLY); | |
290 | if (fd < 0) { | |
291 | goto error; | |
292 | } | |
293 | ||
294 | /* Notify by writing on the pipe */ | |
295 | ret = write(fd, "42", 2); | |
296 | if (ret < 0) { | |
297 | perror("write"); | |
298 | } | |
299 | ||
300 | error: | |
301 | return ret; | |
302 | } | |
303 | ||
304 | /* | |
305 | * find_session | |
306 | * | |
307 | * Return a ltt_session structure ptr that matches the uuid. | |
308 | */ | |
309 | static struct ltt_session *find_session(uuid_t session_id) | |
310 | { | |
311 | struct ltt_session *iter = NULL; | |
312 | ||
313 | /* Sanity check for NULL session_id */ | |
314 | if (uuid_is_null(session_id)) { | |
315 | goto end; | |
316 | } | |
317 | ||
318 | cds_list_for_each_entry(iter, <t_session_list.head, list) { | |
319 | if (uuid_compare(iter->uuid, session_id)) { | |
320 | break; | |
321 | } | |
322 | } | |
323 | ||
324 | end: | |
325 | return iter; | |
326 | } | |
327 | ||
328 | /* | |
329 | * destroy_session | |
330 | * | |
331 | * Delete session from the global session list | |
332 | * and free the memory. | |
333 | */ | |
334 | static void destroy_session(uuid_t session_id) | |
335 | { | |
336 | struct ltt_session *iter = NULL; | |
337 | ||
338 | cds_list_for_each_entry(iter, <t_session_list.head, list) { | |
339 | if (uuid_compare(iter->uuid, session_id)) { | |
340 | cds_list_del(&iter->list); | |
341 | break; | |
342 | } | |
343 | } | |
344 | ||
345 | if (iter) { | |
346 | free(iter); | |
347 | session_count--; | |
348 | } | |
349 | } | |
350 | ||
351 | /* | |
352 | * create_session | |
353 | * | |
aaf97519 DG |
354 | * Create a brand new session and add it to the |
355 | * global session list. | |
fac6795d | 356 | */ |
aaf97519 | 357 | static int create_session(char *name, uuid_t *session_id) |
fac6795d DG |
358 | { |
359 | struct ltt_session *new_session; | |
360 | ||
361 | /* Allocate session data structure */ | |
362 | new_session = malloc(sizeof(struct ltt_session)); | |
363 | if (new_session == NULL) { | |
364 | perror("malloc"); | |
365 | goto error; | |
366 | } | |
367 | ||
368 | if (name != NULL) { | |
369 | if (asprintf(&new_session->name, "%s", name) < 0) { | |
370 | goto error; | |
371 | } | |
372 | } else { | |
373 | /* Generate session name based on the session count */ | |
374 | if (asprintf(&new_session->name, "%s%d", "auto", session_count) < 0) { | |
375 | goto error; | |
376 | } | |
377 | } | |
378 | ||
379 | /* UUID generation */ | |
380 | uuid_generate(new_session->uuid); | |
381 | uuid_copy(*session_id, new_session->uuid); | |
382 | ||
383 | /* Set consumer (identifier) to 0. This means that there is | |
384 | * NO consumer attach to that session yet. | |
385 | */ | |
386 | new_session->ust_consumer = 0; | |
387 | new_session->lttng_consumer = 0; | |
388 | ||
389 | /* Init list */ | |
390 | CDS_INIT_LIST_HEAD(&new_session->ust_traces); | |
391 | CDS_INIT_LIST_HEAD(&new_session->lttng_traces); | |
392 | ||
393 | /* Add new session to the global session list */ | |
394 | cds_list_add(&new_session->list, <t_session_list.head); | |
395 | ||
396 | session_count++; | |
397 | ||
398 | return 0; | |
399 | ||
400 | error: | |
401 | return -1; | |
402 | } | |
403 | ||
404 | /* | |
ca95a216 | 405 | * get_list_apps |
fac6795d DG |
406 | * |
407 | * List traceable user-space application and fill an | |
408 | * array of pids. | |
fac6795d | 409 | */ |
aaf97519 | 410 | static void get_list_apps(pid_t *pids) |
fac6795d | 411 | { |
aaf97519 DG |
412 | int i = 0; |
413 | struct ltt_traceable_app *iter; | |
fac6795d | 414 | |
e065084a DG |
415 | /* TODO: Mutex needed to access this list */ |
416 | cds_list_for_each_entry(iter, <t_traceable_app_list.head, list) { | |
aaf97519 DG |
417 | pids[i] = iter->pid; |
418 | i++; | |
fac6795d | 419 | } |
ca95a216 | 420 | } |
fac6795d | 421 | |
ca95a216 DG |
422 | /* |
423 | * get_list_sessions | |
424 | * | |
425 | * List sessions and fill the data buffer. | |
426 | */ | |
aaf97519 | 427 | static void get_list_sessions(struct lttng_session *lt) |
ca95a216 DG |
428 | { |
429 | int i = 0; | |
aaf97519 | 430 | struct ltt_session *iter; |
ca95a216 | 431 | struct lttng_session lsess; |
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) { | |
aaf97519 | 437 | /* Copy name and uuid */ |
ca95a216 DG |
438 | uuid_unparse(iter->uuid, lsess.uuid); |
439 | strncpy(lsess.name, iter->name, sizeof(lsess.name)); | |
aaf97519 DG |
440 | lsess.name[sizeof(lsess.name) - 1] = '\0'; |
441 | memcpy(<[i], &lsess, sizeof(lsess)); | |
ca95a216 DG |
442 | i++; |
443 | /* Reset struct for next pass */ | |
444 | memset(&lsess, 0, sizeof(lsess)); | |
445 | } | |
fac6795d DG |
446 | } |
447 | ||
e065084a DG |
448 | /* |
449 | * copy_common_data | |
450 | * | |
451 | * Copy common data between lttcomm_lttng_msg and lttcomm_session_msg | |
452 | */ | |
453 | static void copy_common_data(struct lttcomm_lttng_msg *llm, struct lttcomm_session_msg *lsm) | |
454 | { | |
455 | llm->cmd_type = lsm->cmd_type; | |
456 | llm->pid = lsm->pid; | |
aaf97519 DG |
457 | |
458 | /* Manage uuid */ | |
459 | if (lsm->session_id != NULL) { | |
460 | strncpy(llm->session_id, lsm->session_id, UUID_STR_LEN); | |
e065084a | 461 | } |
aaf97519 DG |
462 | |
463 | strncpy(llm->trace_name, lsm->trace_name, strlen(llm->trace_name)); | |
e065084a DG |
464 | } |
465 | ||
ca95a216 DG |
466 | /* |
467 | * setup_data_buffer | |
468 | * | |
469 | * Setup the outgoing data buffer for the response | |
470 | * data allocating the right amount of memory. | |
471 | * | |
472 | * Return total size of the buffer pointed by buf. | |
473 | */ | |
aaf97519 | 474 | static int setup_data_buffer(char **buf, size_t s_data, struct lttcomm_lttng_msg *llm) |
ca95a216 DG |
475 | { |
476 | int ret = 0; | |
ca95a216 DG |
477 | size_t buf_size; |
478 | ||
479 | buf_size = sizeof(struct lttcomm_lttng_msg) + s_data; | |
aaf97519 DG |
480 | *buf = malloc(buf_size); |
481 | if (*buf == NULL) { | |
ca95a216 DG |
482 | perror("malloc"); |
483 | ret = -1; | |
484 | goto error; | |
485 | } | |
486 | ||
487 | /* Setup lttcomm_lttng_msg data and copy | |
488 | * it to the newly allocated buffer. | |
489 | */ | |
490 | llm->size_payload = s_data; | |
aaf97519 | 491 | memcpy(*buf, llm, sizeof(struct lttcomm_lttng_msg)); |
ca95a216 DG |
492 | |
493 | return buf_size; | |
494 | ||
495 | error: | |
496 | return ret; | |
497 | } | |
498 | ||
fac6795d DG |
499 | /* |
500 | * process_client_msg | |
501 | * | |
502 | * This takes the lttcomm_session_msg struct and process the command requested | |
e065084a DG |
503 | * by the client. It then creates response(s) and send it back to the |
504 | * given socket (sock). | |
fac6795d | 505 | * |
e065084a | 506 | * Return any error encountered or 0 for success. |
fac6795d | 507 | */ |
e065084a | 508 | static int process_client_msg(int sock, struct lttcomm_session_msg *lsm) |
fac6795d | 509 | { |
e065084a | 510 | int ret; |
ca95a216 | 511 | int buf_size; |
aaf97519 DG |
512 | char *send_buf = NULL; |
513 | struct lttcomm_lttng_msg llm; | |
fac6795d DG |
514 | |
515 | /* Copy common data to identify the response | |
516 | * on the lttng client side. | |
517 | */ | |
e065084a | 518 | copy_common_data(&llm, lsm); |
fac6795d DG |
519 | |
520 | /* Default return code. | |
e065084a | 521 | * In our world, everything is OK... right? ;) |
fac6795d | 522 | */ |
e065084a | 523 | llm.ret_code = LTTCOMM_OK; |
fac6795d DG |
524 | |
525 | /* Process by command type */ | |
526 | switch (lsm->cmd_type) { | |
aaf97519 DG |
527 | case LTTNG_CREATE_SESSION: |
528 | { | |
529 | uuid_t uuid; | |
530 | ret = create_session(lsm->session_name, &uuid); | |
531 | if (ret < 0) { | |
532 | goto error; | |
533 | } | |
534 | ||
535 | uuid_unparse(uuid, llm.session_id); | |
536 | ||
537 | buf_size = setup_data_buffer(&send_buf, 0, &llm); | |
538 | if (buf_size < 0) { | |
539 | ret = LTTCOMM_FATAL; | |
540 | goto error; | |
541 | } | |
542 | ||
1fd70b72 | 543 | goto send; |
aaf97519 DG |
544 | break; |
545 | } | |
fac6795d DG |
546 | case UST_LIST_APPS: |
547 | { | |
ca95a216 DG |
548 | /* Stop right now if no apps */ |
549 | if (traceable_app_count == 0) { | |
e065084a DG |
550 | ret = LTTCOMM_NO_APPS; |
551 | goto error; | |
552 | } | |
553 | ||
ca95a216 DG |
554 | /* Setup data buffer and details for transmission */ |
555 | buf_size = setup_data_buffer(&send_buf, | |
556 | sizeof(pid_t) * traceable_app_count, &llm); | |
557 | if (buf_size < 0) { | |
558 | ret = LTTCOMM_FATAL; | |
559 | goto error; | |
560 | } | |
561 | ||
aaf97519 | 562 | get_list_apps((pid_t *)(send_buf + sizeof(struct lttcomm_lttng_msg))); |
ca95a216 | 563 | |
1fd70b72 | 564 | goto send; |
fac6795d DG |
565 | break; |
566 | } | |
57167058 DG |
567 | case LTTNG_LIST_SESSIONS: |
568 | { | |
ca95a216 DG |
569 | /* Stop right now if no session */ |
570 | if (session_count == 0) { | |
57167058 DG |
571 | ret = LTTCOMM_NO_SESS; |
572 | goto error; | |
573 | } | |
574 | ||
ca95a216 DG |
575 | /* Setup data buffer and details for transmission */ |
576 | buf_size = setup_data_buffer(&send_buf, | |
577 | (sizeof(struct lttng_session) * session_count), &llm); | |
578 | if (buf_size < 0) { | |
579 | ret = LTTCOMM_FATAL; | |
580 | goto error; | |
581 | } | |
582 | ||
aaf97519 | 583 | get_list_sessions((struct lttng_session *)(send_buf + sizeof(struct lttcomm_lttng_msg))); |
ca95a216 | 584 | |
1fd70b72 | 585 | goto send; |
57167058 DG |
586 | break; |
587 | } | |
fac6795d | 588 | default: |
e065084a | 589 | { |
fac6795d | 590 | /* Undefined command */ |
e065084a | 591 | ret = LTTCOMM_UND; |
ca95a216 | 592 | goto error; |
e065084a | 593 | } |
fac6795d DG |
594 | } |
595 | ||
1fd70b72 DG |
596 | send: |
597 | ret = send_unix_sock(sock, send_buf, buf_size); | |
598 | ||
ca95a216 DG |
599 | if (send_buf != NULL) { |
600 | free(send_buf); | |
601 | } | |
602 | ||
e065084a DG |
603 | return ret; |
604 | ||
605 | error: | |
606 | /* Notify client of error */ | |
607 | llm.ret_code = ret; | |
ca95a216 | 608 | llm.size_payload = 0; |
e065084a DG |
609 | send_unix_sock(sock, (void*) &llm, sizeof(llm)); |
610 | ||
611 | return -1; | |
fac6795d DG |
612 | } |
613 | ||
614 | /* | |
615 | * usage function on stderr | |
616 | */ | |
617 | static void usage(void) | |
618 | { | |
619 | fprintf(stderr, "Usage:\n%s OPTIONS\n\nOptions:\n" | |
620 | "\t-h, --help\t\tDisplay this usage.\n" | |
621 | "\t-c, --client-sock PATH\t\tSpecify path for the client unix socket\n" | |
622 | "\t-a, --apps-sock PATH\t\tSpecify path for apps unix socket.\n" | |
623 | "\t-d, --daemonize\t\tStart as a daemon.\n" | |
624 | "\t-g, --group NAME\t\tSpecify the tracing group name. (default: tracing)\n" | |
5b8719f5 | 625 | "\t-V, --version\t\tShow version number.\n" |
75462a81 DG |
626 | "\t-S, --sig-parent\t\tSend SIGCHLD to parent pid to notify readiness.\n" |
627 | "\t-q, --quiet\t\tNo output at all.\n", | |
fac6795d DG |
628 | progname); |
629 | } | |
630 | ||
631 | /* | |
632 | * daemon argument parsing | |
633 | */ | |
634 | static int parse_args(int argc, char **argv) | |
635 | { | |
636 | int c; | |
637 | ||
638 | static struct option long_options[] = { | |
639 | { "client-sock", 1, 0, 'c' }, | |
640 | { "apps-sock", 1, 0, 'a' }, | |
641 | { "daemonize", 0, 0, 'd' }, | |
5b8719f5 | 642 | { "sig-parent", 0, 0, 'S' }, |
fac6795d DG |
643 | { "help", 0, 0, 'h' }, |
644 | { "group", 1, 0, 'g' }, | |
645 | { "version", 0, 0, 'V' }, | |
75462a81 | 646 | { "quiet", 0, 0, 'q' }, |
fac6795d DG |
647 | { NULL, 0, 0, 0 } |
648 | }; | |
649 | ||
650 | while (1) { | |
651 | int option_index = 0; | |
75462a81 | 652 | c = getopt_long(argc, argv, "dhqVS" "a:c:g:s:", long_options, &option_index); |
fac6795d DG |
653 | if (c == -1) { |
654 | break; | |
655 | } | |
656 | ||
657 | switch (c) { | |
658 | case 0: | |
659 | fprintf(stderr, "option %s", long_options[option_index].name); | |
660 | if (optarg) { | |
661 | fprintf(stderr, " with arg %s\n", optarg); | |
662 | } | |
663 | break; | |
664 | case 's': | |
665 | snprintf(client_unix_sock_path, PATH_MAX, "%s", optarg); | |
666 | break; | |
667 | case 'a': | |
668 | snprintf(apps_unix_sock_path, PATH_MAX, "%s", optarg); | |
669 | break; | |
670 | case 'd': | |
671 | opt_daemon = 1; | |
672 | break; | |
673 | case 'g': | |
674 | opt_tracing_group = strdup(optarg); | |
675 | break; | |
676 | case 'h': | |
677 | usage(); | |
678 | exit(EXIT_FAILURE); | |
679 | case 'V': | |
680 | fprintf(stdout, "%s\n", VERSION); | |
681 | exit(EXIT_SUCCESS); | |
5b8719f5 DG |
682 | case 'S': |
683 | opt_sig_parent = 1; | |
684 | break; | |
75462a81 DG |
685 | case 'q': |
686 | opt_quiet = 1; | |
687 | break; | |
fac6795d DG |
688 | default: |
689 | /* Unknown option or other error. | |
690 | * Error is printed by getopt, just return */ | |
691 | return -1; | |
692 | } | |
693 | } | |
694 | ||
695 | return 0; | |
696 | } | |
697 | ||
698 | /* | |
699 | * init_daemon_socket | |
700 | * | |
701 | * Creates the two needed socket by the daemon. | |
702 | * apps_socket - The communication socket for all UST apps. | |
703 | * client_socket - The communication of the cli tool (lttng). | |
704 | */ | |
705 | static int init_daemon_socket() | |
706 | { | |
707 | int ret = 0; | |
708 | mode_t old_umask; | |
709 | ||
710 | old_umask = umask(0); | |
711 | ||
712 | /* Create client tool unix socket */ | |
713 | client_socket = lttcomm_create_unix_sock(client_unix_sock_path); | |
714 | if (client_socket < 0) { | |
715 | ret = -1; | |
716 | goto end; | |
717 | } | |
718 | ||
719 | /* File permission MUST be 660 */ | |
720 | ret = chmod(client_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); | |
721 | if (ret < 0) { | |
722 | perror("chmod"); | |
723 | goto end; | |
724 | } | |
725 | ||
726 | /* Create the application unix socket */ | |
727 | apps_socket = lttcomm_create_unix_sock(apps_unix_sock_path); | |
728 | if (apps_socket < 0) { | |
729 | ret = -1; | |
730 | goto end; | |
731 | } | |
732 | ||
733 | /* File permission MUST be 660 */ | |
734 | ret = chmod(apps_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH); | |
735 | if (ret < 0) { | |
736 | perror("chmod"); | |
737 | goto end; | |
738 | } | |
739 | ||
740 | end: | |
741 | umask(old_umask); | |
742 | return ret; | |
743 | } | |
744 | ||
745 | /* | |
746 | * check_existing_daemon | |
747 | * | |
748 | * Check if the global socket is available. | |
749 | * If yes, error is returned. | |
750 | */ | |
751 | static int check_existing_daemon() | |
752 | { | |
753 | int ret; | |
754 | ||
755 | ret = access(client_unix_sock_path, F_OK); | |
756 | if (ret == 0) { | |
757 | ret = access(apps_unix_sock_path, F_OK); | |
758 | } | |
759 | ||
760 | return ret; | |
761 | } | |
762 | ||
763 | /* | |
764 | * get_home_dir | |
765 | * | |
766 | * Return pointer to home directory path using | |
767 | * the env variable HOME. | |
768 | * | |
769 | * Default : /tmp | |
770 | */ | |
771 | static const char *get_home_dir(void) | |
772 | { | |
773 | const char *home_path; | |
774 | ||
686204ab | 775 | if ((home_path = (const char *) getenv("HOME")) == NULL) { |
fac6795d DG |
776 | home_path = default_home_dir; |
777 | } | |
778 | ||
779 | return home_path; | |
780 | } | |
781 | ||
782 | /* | |
783 | * set_socket_perms | |
784 | * | |
785 | * Set the tracing group gid onto the client socket. | |
786 | */ | |
787 | static int set_socket_perms(void) | |
788 | { | |
789 | int ret; | |
790 | struct group *grp; | |
791 | ||
792 | /* Decide which group name to use */ | |
793 | (opt_tracing_group != NULL) ? | |
794 | (grp = getgrnam(opt_tracing_group)) : | |
795 | (grp = getgrnam(default_tracing_group)); | |
796 | ||
797 | if (grp == NULL) { | |
75462a81 | 798 | ERR("Missing tracing group. Aborting execution.\n"); |
fac6795d DG |
799 | ret = -1; |
800 | goto end; | |
801 | } | |
802 | ||
803 | ret = chown(client_unix_sock_path, 0, grp->gr_gid); | |
804 | if (ret < 0) { | |
805 | perror("chown"); | |
806 | } | |
807 | ||
808 | end: | |
809 | return ret; | |
810 | } | |
811 | ||
fac6795d DG |
812 | /* |
813 | * set_signal_handler | |
814 | * | |
815 | * Setup signal handler for : | |
816 | * SIGINT, SIGTERM, SIGPIPE | |
817 | */ | |
818 | static int set_signal_handler(void) | |
819 | { | |
820 | int ret = 0; | |
821 | struct sigaction sa; | |
822 | sigset_t sigset; | |
823 | ||
824 | if ((ret = sigemptyset(&sigset)) < 0) { | |
825 | perror("sigemptyset"); | |
826 | return ret; | |
827 | } | |
828 | ||
829 | sa.sa_handler = sighandler; | |
830 | sa.sa_mask = sigset; | |
831 | sa.sa_flags = 0; | |
832 | if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) { | |
833 | perror("sigaction"); | |
834 | return ret; | |
835 | } | |
836 | ||
837 | if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) { | |
838 | perror("sigaction"); | |
839 | return ret; | |
840 | } | |
841 | ||
842 | if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) { | |
843 | perror("sigaction"); | |
844 | return ret; | |
845 | } | |
846 | ||
847 | return ret; | |
848 | } | |
849 | ||
850 | /** | |
851 | * sighandler | |
852 | * | |
853 | * Signal handler for the daemon | |
854 | */ | |
855 | static void sighandler(int sig) | |
856 | { | |
857 | switch (sig) { | |
858 | case SIGPIPE: | |
859 | case SIGINT: | |
860 | case SIGTERM: | |
861 | cleanup(); | |
686204ab | 862 | break; |
fac6795d DG |
863 | default: |
864 | break; | |
865 | } | |
866 | ||
867 | exit(EXIT_SUCCESS); | |
868 | } | |
869 | ||
870 | /* | |
871 | * cleanup | |
872 | * | |
873 | * Cleanup the daemon on exit | |
874 | */ | |
875 | static void cleanup() | |
876 | { | |
877 | /* <fun> */ | |
75462a81 DG |
878 | MSG("\n\n%c[%d;%dm*** assert failed *** ==> %c[%dm", 27,1,31,27,0); |
879 | MSG("%c[%d;%dm Matthew, BEET driven development works!%c[%dm\n",27,1,33,27,0); | |
fac6795d DG |
880 | /* </fun> */ |
881 | ||
882 | unlink(client_unix_sock_path); | |
883 | unlink(apps_unix_sock_path); | |
884 | } | |
885 | ||
886 | /* | |
887 | * main | |
888 | */ | |
889 | int main(int argc, char **argv) | |
890 | { | |
891 | int i; | |
892 | int ret = 0; | |
893 | void *status; | |
894 | pthread_t threads[2]; | |
895 | ||
896 | /* Parse arguments */ | |
897 | progname = argv[0]; | |
898 | if ((ret = parse_args(argc, argv) < 0)) { | |
899 | goto error; | |
900 | } | |
901 | ||
902 | /* Daemonize */ | |
903 | if (opt_daemon) { | |
53094c05 DG |
904 | ret = daemon(0, 0); |
905 | if (ret < 0) { | |
906 | perror("daemon"); | |
907 | goto error; | |
908 | } | |
fac6795d DG |
909 | } |
910 | ||
911 | /* Check if daemon is UID = 0 */ | |
912 | is_root = !getuid(); | |
913 | ||
914 | /* Set all sockets path */ | |
915 | if (is_root) { | |
916 | if (strlen(apps_unix_sock_path) == 0) { | |
917 | (snprintf(apps_unix_sock_path, PATH_MAX, | |
918 | DEFAULT_GLOBAL_APPS_UNIX_SOCK)); | |
919 | } | |
920 | ||
921 | if (strlen(client_unix_sock_path) == 0) { | |
922 | (snprintf(client_unix_sock_path, PATH_MAX, | |
923 | DEFAULT_GLOBAL_CLIENT_UNIX_SOCK)); | |
924 | } | |
925 | } else { | |
926 | if (strlen(apps_unix_sock_path) == 0) { | |
927 | (snprintf(apps_unix_sock_path, PATH_MAX, | |
928 | DEFAULT_HOME_APPS_UNIX_SOCK, get_home_dir())); | |
929 | } | |
930 | ||
931 | /* Set the cli tool unix socket path */ | |
932 | if (strlen(client_unix_sock_path) == 0) { | |
933 | (snprintf(client_unix_sock_path, PATH_MAX, | |
934 | DEFAULT_HOME_CLIENT_UNIX_SOCK, get_home_dir())); | |
935 | } | |
936 | } | |
937 | ||
938 | /* See if daemon already exist. If any of the two | |
939 | * socket needed by the daemon are present, this test fails | |
940 | */ | |
941 | if ((ret = check_existing_daemon()) == 0) { | |
75462a81 | 942 | ERR("Already running daemon.\n"); |
fac6795d DG |
943 | goto error; |
944 | } | |
945 | ||
946 | if (set_signal_handler() < 0) { | |
947 | goto error; | |
948 | } | |
949 | ||
950 | /* Setup the two needed unix socket */ | |
951 | if (init_daemon_socket() < 0) { | |
952 | goto error; | |
953 | } | |
954 | ||
955 | /* Set credentials to socket */ | |
956 | if (is_root && (set_socket_perms() < 0)) { | |
957 | goto error; | |
958 | } | |
959 | ||
5b8719f5 DG |
960 | /* Get parent pid if -S, --sig-parent is specified. */ |
961 | if (opt_sig_parent) { | |
962 | ppid = getppid(); | |
963 | } | |
964 | ||
fac6795d DG |
965 | while (1) { |
966 | /* Create thread to manage the client socket */ | |
967 | ret = pthread_create(&threads[0], NULL, thread_manage_clients, (void *) NULL); | |
968 | if (ret != 0) { | |
969 | perror("pthread_create"); | |
970 | goto error; | |
971 | } | |
972 | ||
973 | /* Create thread to manage application socket */ | |
974 | ret = pthread_create(&threads[1], NULL, thread_manage_apps, (void *) NULL); | |
975 | if (ret != 0) { | |
976 | perror("pthread_create"); | |
977 | goto error; | |
978 | } | |
979 | ||
980 | for (i = 0; i < 2; i++) { | |
981 | ret = pthread_join(threads[i], &status); | |
982 | if (ret != 0) { | |
983 | perror("pthread_join"); | |
984 | goto error; | |
985 | } | |
986 | } | |
987 | } | |
988 | ||
989 | cleanup(); | |
990 | return 0; | |
991 | ||
992 | error: | |
993 | cleanup(); | |
994 | ||
995 | return EXIT_FAILURE; | |
996 | } |