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