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) */ | |
5b97ec60 | 38 | #include <lttng/lttng.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 | 103 | |
e07ae692 DG |
104 | DBG("[thread] Manage apps started"); |
105 | ||
fac6795d DG |
106 | /* Notify all applications to register */ |
107 | notify_apps(default_global_apps_pipe); | |
108 | ||
109 | ret = lttcomm_listen_unix_sock(apps_socket); | |
110 | if (ret < 0) { | |
111 | goto error; | |
112 | } | |
113 | ||
114 | while (1) { | |
115 | /* Blocking call, waiting for transmission */ | |
116 | sock = lttcomm_accept_unix_sock(apps_socket); | |
117 | if (sock < 0) { | |
118 | goto error; | |
119 | } | |
120 | ||
121 | /* Basic recv here to handle the very simple data | |
122 | * that the libust send to register (reg_msg). | |
123 | */ | |
124 | ret = recv(sock, ®_msg, sizeof(reg_msg), 0); | |
125 | if (ret < 0) { | |
126 | perror("recv"); | |
127 | continue; | |
128 | } | |
129 | ||
130 | /* Add application to the global traceable list */ | |
131 | if (reg_msg.reg == 1) { | |
132 | /* Registering */ | |
91d76f53 DG |
133 | ret = register_traceable_app(reg_msg.pid, reg_msg.uid); |
134 | if (ret < 0) { | |
135 | /* register_traceable_app only return an error with | |
136 | * ENOMEM. At this point, we better stop everything. | |
137 | */ | |
138 | goto error; | |
139 | } | |
fac6795d DG |
140 | } else { |
141 | /* Unregistering */ | |
91d76f53 | 142 | unregister_traceable_app(reg_msg.pid); |
fac6795d DG |
143 | } |
144 | } | |
145 | ||
146 | error: | |
147 | ||
148 | return NULL; | |
149 | } | |
150 | ||
151 | /* | |
152 | * thread_manage_clients | |
153 | * | |
154 | * This thread manage all clients request using the unix | |
155 | * client socket for communication. | |
156 | */ | |
157 | static void *thread_manage_clients(void *data) | |
158 | { | |
159 | int sock, ret; | |
160 | struct lttcomm_session_msg lsm; | |
fac6795d | 161 | |
e07ae692 DG |
162 | DBG("[thread] Manage client started"); |
163 | ||
fac6795d DG |
164 | ret = lttcomm_listen_unix_sock(client_socket); |
165 | if (ret < 0) { | |
166 | goto error; | |
167 | } | |
168 | ||
5b8719f5 DG |
169 | /* Notify parent pid that we are ready |
170 | * to accept command for client side. | |
171 | */ | |
172 | if (opt_sig_parent) { | |
173 | kill(ppid, SIGCHLD); | |
174 | } | |
175 | ||
fac6795d DG |
176 | while (1) { |
177 | /* Blocking call, waiting for transmission */ | |
178 | sock = lttcomm_accept_unix_sock(client_socket); | |
179 | if (sock < 0) { | |
180 | goto error; | |
181 | } | |
182 | ||
183 | /* | |
184 | * Data is received from the lttng client. The struct | |
185 | * lttcomm_session_msg (lsm) contains the command and data | |
186 | * request of the client. | |
187 | */ | |
188 | ret = lttcomm_recv_unix_sock(sock, &lsm, sizeof(lsm)); | |
87378cf5 | 189 | if (ret <= 0) { |
fac6795d DG |
190 | continue; |
191 | } | |
192 | ||
193 | /* This function dispatch the work to the LTTng or UST libs | |
e065084a DG |
194 | * and then sends back the response to the client. This is needed |
195 | * because there might be more then one lttcomm_lttng_msg to | |
196 | * send out so process_client_msg do both jobs. | |
fac6795d | 197 | */ |
e065084a DG |
198 | ret = process_client_msg(sock, &lsm); |
199 | if (ret < 0) { | |
200 | /* Error detected but still accept command */ | |
201 | continue; | |
fac6795d DG |
202 | } |
203 | } | |
204 | ||
205 | error: | |
206 | return NULL; | |
207 | } | |
208 | ||
e065084a DG |
209 | /* |
210 | * send_unix_sock | |
211 | * | |
212 | * Send data on a unix socket using the liblttsessiondcomm API. | |
213 | * | |
214 | * Return lttcomm error code. | |
215 | */ | |
216 | static int send_unix_sock(int sock, void *buf, size_t len) | |
217 | { | |
218 | /* Check valid length */ | |
219 | if (len <= 0) { | |
220 | return -1; | |
221 | } | |
222 | ||
223 | return lttcomm_send_unix_sock(sock, buf, len); | |
224 | } | |
225 | ||
fac6795d DG |
226 | /* |
227 | * connect_app | |
228 | * | |
229 | * Return a socket connected to the libust communication socket | |
230 | * of the application identified by the pid. | |
379473d2 DG |
231 | * |
232 | * If the pid is not found in the traceable list, | |
233 | * return -1 to indicate error. | |
fac6795d DG |
234 | */ |
235 | static int connect_app(pid_t pid) | |
236 | { | |
91d76f53 DG |
237 | int sock; |
238 | struct ltt_traceable_app *lta; | |
379473d2 | 239 | |
e07ae692 DG |
240 | DBG("Connect to application pid %d", pid); |
241 | ||
91d76f53 DG |
242 | lta = find_app_by_pid(pid); |
243 | if (lta == NULL) { | |
244 | /* App not found */ | |
7442b2ba | 245 | DBG("Application pid %d not found", pid); |
379473d2 DG |
246 | return -1; |
247 | } | |
fac6795d | 248 | |
91d76f53 | 249 | sock = ustctl_connect_pid(lta->pid); |
fac6795d | 250 | if (sock < 0) { |
75462a81 | 251 | ERR("Fail connecting to the PID %d\n", pid); |
fac6795d DG |
252 | } |
253 | ||
254 | return sock; | |
255 | } | |
256 | ||
257 | /* | |
258 | * notify_apps | |
259 | * | |
260 | * Notify apps by writing 42 to a named pipe using name. | |
261 | * Every applications waiting for a ltt-sessiond will be notified | |
262 | * and re-register automatically to the session daemon. | |
263 | * | |
264 | * Return open or write error value. | |
265 | */ | |
266 | static int notify_apps(const char *name) | |
267 | { | |
268 | int fd; | |
269 | int ret = -1; | |
270 | ||
e07ae692 DG |
271 | DBG("Notify the global application pipe"); |
272 | ||
fac6795d DG |
273 | /* Try opening the global pipe */ |
274 | fd = open(name, O_WRONLY); | |
275 | if (fd < 0) { | |
276 | goto error; | |
277 | } | |
278 | ||
279 | /* Notify by writing on the pipe */ | |
280 | ret = write(fd, "42", 2); | |
281 | if (ret < 0) { | |
282 | perror("write"); | |
283 | } | |
284 | ||
285 | error: | |
286 | return ret; | |
287 | } | |
288 | ||
379473d2 DG |
289 | /* |
290 | * ust_create_trace | |
291 | * | |
292 | * Create an userspace trace using pid. | |
293 | * This trace is then appended to the current session | |
294 | * ust trace list. | |
295 | */ | |
296 | static int ust_create_trace(pid_t pid) | |
297 | { | |
298 | int sock, ret; | |
299 | struct ltt_ust_trace *trace; | |
300 | ||
e07ae692 DG |
301 | DBG("Creating trace for pid %d", pid); |
302 | ||
379473d2 DG |
303 | trace = malloc(sizeof(struct ltt_ust_trace)); |
304 | if (trace == NULL) { | |
305 | perror("malloc"); | |
306 | ret = -1; | |
307 | goto error; | |
308 | } | |
309 | ||
310 | /* Init */ | |
311 | trace->pid = pid; | |
312 | trace->shmid = 0; | |
1657e9bb DG |
313 | /* NOTE: to be removed. Trace name will no longer be |
314 | * required for LTTng userspace tracer. For now, we set it | |
315 | * to 'auto' for API compliance. | |
316 | */ | |
317 | snprintf(trace->name, 5, "auto"); | |
379473d2 DG |
318 | |
319 | /* Connect to app using ustctl API */ | |
320 | sock = connect_app(pid); | |
321 | if (sock < 0) { | |
322 | ret = LTTCOMM_NO_TRACEABLE; | |
323 | goto error; | |
324 | } | |
325 | ||
1657e9bb | 326 | ret = ustctl_create_trace(sock, trace->name); |
379473d2 DG |
327 | if (ret < 0) { |
328 | ret = LTTCOMM_CREATE_FAIL; | |
329 | goto error; | |
330 | } | |
331 | ||
332 | /* Check if current session is valid */ | |
333 | if (current_session) { | |
334 | cds_list_add(&trace->list, ¤t_session->ust_traces); | |
1657e9bb | 335 | current_session->ust_trace_count++; |
379473d2 DG |
336 | } |
337 | ||
338 | error: | |
339 | return ret; | |
340 | } | |
341 | ||
ce3d728c DG |
342 | /* |
343 | * ust_start_trace | |
344 | * | |
345 | * Start a trace. This trace, identified by the pid, must be | |
346 | * in the current session ust_traces list. | |
347 | */ | |
348 | static int ust_start_trace(pid_t pid) | |
349 | { | |
350 | int sock, ret; | |
351 | struct ltt_ust_trace *trace; | |
352 | ||
353 | DBG("Starting trace for pid %d", pid); | |
354 | ||
355 | trace = find_session_ust_trace_by_pid(current_session, pid); | |
356 | if (trace == NULL) { | |
357 | ret = LTTCOMM_NO_TRACE; | |
358 | goto error; | |
359 | } | |
360 | ||
361 | /* Connect to app using ustctl API */ | |
362 | sock = connect_app(pid); | |
363 | if (sock < 0) { | |
364 | ret = LTTCOMM_NO_TRACEABLE; | |
365 | goto error; | |
366 | } | |
367 | ||
368 | ret = ustctl_start_trace(sock, "auto"); | |
369 | if (ret < 0) { | |
370 | ret = LTTCOMM_START_FAIL; | |
371 | goto error; | |
372 | } | |
373 | ||
374 | error: | |
375 | return ret; | |
376 | } | |
377 | ||
520ff687 DG |
378 | /* |
379 | * ust_stop_trace | |
380 | * | |
381 | * Stop a trace. This trace, identified by the pid, must be | |
382 | * in the current session ust_traces list. | |
383 | */ | |
384 | static int ust_stop_trace(pid_t pid) | |
385 | { | |
386 | int sock, ret; | |
387 | struct ltt_ust_trace *trace; | |
388 | ||
389 | DBG("Stopping trace for pid %d", pid); | |
390 | ||
391 | trace = find_session_ust_trace_by_pid(current_session, pid); | |
392 | if (trace == NULL) { | |
393 | ret = LTTCOMM_NO_TRACE; | |
394 | goto error; | |
395 | } | |
396 | ||
397 | /* Connect to app using ustctl API */ | |
398 | sock = connect_app(pid); | |
399 | if (sock < 0) { | |
400 | ret = LTTCOMM_NO_TRACEABLE; | |
401 | goto error; | |
402 | } | |
403 | ||
404 | ret = ustctl_stop_trace(sock, trace->name); | |
405 | if (ret < 0) { | |
406 | ret = LTTCOMM_STOP_FAIL; | |
407 | goto error; | |
408 | } | |
409 | ||
410 | error: | |
411 | return ret; | |
412 | } | |
413 | ||
e065084a DG |
414 | /* |
415 | * copy_common_data | |
416 | * | |
417 | * Copy common data between lttcomm_lttng_msg and lttcomm_session_msg | |
418 | */ | |
419 | static void copy_common_data(struct lttcomm_lttng_msg *llm, struct lttcomm_session_msg *lsm) | |
420 | { | |
421 | llm->cmd_type = lsm->cmd_type; | |
422 | llm->pid = lsm->pid; | |
aaf97519 DG |
423 | |
424 | /* Manage uuid */ | |
8028d920 DG |
425 | if (!uuid_is_null(lsm->session_id)) { |
426 | uuid_copy(llm->session_id, lsm->session_id); | |
e065084a | 427 | } |
aaf97519 DG |
428 | |
429 | strncpy(llm->trace_name, lsm->trace_name, strlen(llm->trace_name)); | |
8028d920 | 430 | llm->trace_name[strlen(llm->trace_name) - 1] = '\0'; |
e065084a DG |
431 | } |
432 | ||
ca95a216 DG |
433 | /* |
434 | * setup_data_buffer | |
435 | * | |
436 | * Setup the outgoing data buffer for the response | |
437 | * data allocating the right amount of memory. | |
438 | * | |
439 | * Return total size of the buffer pointed by buf. | |
440 | */ | |
aaf97519 | 441 | static int setup_data_buffer(char **buf, size_t s_data, struct lttcomm_lttng_msg *llm) |
ca95a216 DG |
442 | { |
443 | int ret = 0; | |
ca95a216 DG |
444 | size_t buf_size; |
445 | ||
446 | buf_size = sizeof(struct lttcomm_lttng_msg) + s_data; | |
aaf97519 DG |
447 | *buf = malloc(buf_size); |
448 | if (*buf == NULL) { | |
ca95a216 DG |
449 | perror("malloc"); |
450 | ret = -1; | |
451 | goto error; | |
452 | } | |
453 | ||
454 | /* Setup lttcomm_lttng_msg data and copy | |
455 | * it to the newly allocated buffer. | |
456 | */ | |
457 | llm->size_payload = s_data; | |
aaf97519 | 458 | memcpy(*buf, llm, sizeof(struct lttcomm_lttng_msg)); |
ca95a216 DG |
459 | |
460 | return buf_size; | |
461 | ||
462 | error: | |
463 | return ret; | |
464 | } | |
465 | ||
fac6795d DG |
466 | /* |
467 | * process_client_msg | |
468 | * | |
469 | * This takes the lttcomm_session_msg struct and process the command requested | |
e065084a DG |
470 | * by the client. It then creates response(s) and send it back to the |
471 | * given socket (sock). | |
fac6795d | 472 | * |
e065084a | 473 | * Return any error encountered or 0 for success. |
fac6795d | 474 | */ |
e065084a | 475 | static int process_client_msg(int sock, struct lttcomm_session_msg *lsm) |
fac6795d | 476 | { |
e065084a | 477 | int ret; |
ca95a216 | 478 | int buf_size; |
7e6e59cd | 479 | size_t header_size; |
aaf97519 DG |
480 | char *send_buf = NULL; |
481 | struct lttcomm_lttng_msg llm; | |
fac6795d | 482 | |
e07ae692 DG |
483 | DBG("Processing client message"); |
484 | ||
fac6795d DG |
485 | /* Copy common data to identify the response |
486 | * on the lttng client side. | |
487 | */ | |
e065084a | 488 | copy_common_data(&llm, lsm); |
fac6795d | 489 | |
379473d2 DG |
490 | /* Check command that needs a session */ |
491 | if (lsm->cmd_type != LTTNG_CREATE_SESSION && | |
492 | lsm->cmd_type != LTTNG_LIST_SESSIONS && | |
493 | lsm->cmd_type != UST_LIST_APPS) | |
494 | { | |
495 | current_session = find_session_by_uuid(lsm->session_id); | |
496 | if (current_session == NULL) { | |
497 | ret = LTTCOMM_SELECT_SESS; | |
498 | goto end; | |
499 | } | |
500 | } | |
501 | ||
fac6795d | 502 | /* Default return code. |
e065084a | 503 | * In our world, everything is OK... right? ;) |
fac6795d | 504 | */ |
e065084a | 505 | llm.ret_code = LTTCOMM_OK; |
fac6795d | 506 | |
7e6e59cd DG |
507 | header_size = sizeof(struct lttcomm_lttng_msg); |
508 | ||
fac6795d DG |
509 | /* Process by command type */ |
510 | switch (lsm->cmd_type) { | |
aaf97519 DG |
511 | case LTTNG_CREATE_SESSION: |
512 | { | |
8028d920 | 513 | ret = create_session(lsm->session_name, &llm.session_id); |
aaf97519 | 514 | if (ret < 0) { |
27673bb6 DG |
515 | if (ret == -1) { |
516 | ret = LTTCOMM_EXIST_SESS; | |
517 | } else { | |
518 | ret = LTTCOMM_FATAL; | |
519 | } | |
8028d920 | 520 | goto end; |
aaf97519 DG |
521 | } |
522 | ||
aaf97519 DG |
523 | buf_size = setup_data_buffer(&send_buf, 0, &llm); |
524 | if (buf_size < 0) { | |
525 | ret = LTTCOMM_FATAL; | |
8028d920 | 526 | goto end; |
aaf97519 DG |
527 | } |
528 | ||
aaf97519 DG |
529 | break; |
530 | } | |
8028d920 DG |
531 | case LTTNG_DESTROY_SESSION: |
532 | { | |
533 | ret = destroy_session(&lsm->session_id); | |
534 | if (ret < 0) { | |
535 | ret = LTTCOMM_NO_SESS; | |
536 | } else { | |
537 | ret = LTTCOMM_OK; | |
538 | } | |
539 | ||
540 | /* No auxiliary data so only send the llm struct. */ | |
541 | goto end; | |
542 | } | |
1657e9bb DG |
543 | case LTTNG_LIST_TRACES: |
544 | { | |
545 | unsigned int trace_count = get_trace_count_per_session(current_session); | |
546 | ||
547 | if (trace_count == 0) { | |
548 | ret = LTTCOMM_NO_TRACE; | |
549 | goto end; | |
550 | } | |
551 | ||
552 | buf_size = setup_data_buffer(&send_buf, | |
553 | sizeof(struct lttng_trace) * trace_count, &llm); | |
554 | if (buf_size < 0) { | |
555 | ret = LTTCOMM_FATAL; | |
556 | goto end; | |
557 | } | |
558 | ||
559 | get_traces_per_session(current_session, (struct lttng_trace *)(send_buf + header_size)); | |
560 | break; | |
561 | } | |
df0da139 DG |
562 | case UST_CREATE_TRACE: |
563 | { | |
379473d2 | 564 | ret = ust_create_trace(lsm->pid); |
df0da139 | 565 | if (ret < 0) { |
ce3d728c DG |
566 | /* If -1 is returned from ust_create_trace, malloc |
567 | * failed so it's pretty much a fatal error. | |
568 | */ | |
569 | ret = LTTCOMM_FATAL; | |
379473d2 | 570 | goto end; |
df0da139 DG |
571 | } |
572 | ||
379473d2 | 573 | /* No auxiliary data so only send the llm struct. */ |
df0da139 DG |
574 | goto end; |
575 | } | |
fac6795d DG |
576 | case UST_LIST_APPS: |
577 | { | |
91d76f53 | 578 | unsigned int app_count = get_app_count(); |
ca95a216 | 579 | /* Stop right now if no apps */ |
91d76f53 | 580 | if (app_count == 0) { |
e065084a | 581 | ret = LTTCOMM_NO_APPS; |
8028d920 | 582 | goto end; |
e065084a DG |
583 | } |
584 | ||
ca95a216 DG |
585 | /* Setup data buffer and details for transmission */ |
586 | buf_size = setup_data_buffer(&send_buf, | |
91d76f53 | 587 | sizeof(pid_t) * app_count, &llm); |
ca95a216 DG |
588 | if (buf_size < 0) { |
589 | ret = LTTCOMM_FATAL; | |
8028d920 | 590 | goto end; |
ca95a216 DG |
591 | } |
592 | ||
91d76f53 | 593 | get_app_list_pids((pid_t *)(send_buf + header_size)); |
ca95a216 | 594 | |
fac6795d DG |
595 | break; |
596 | } | |
ce3d728c DG |
597 | case UST_START_TRACE: |
598 | { | |
599 | ret = ust_start_trace(lsm->pid); | |
600 | ||
601 | /* No auxiliary data so only send the llm struct. */ | |
602 | goto end; | |
603 | } | |
520ff687 DG |
604 | case UST_STOP_TRACE: |
605 | { | |
606 | ret = ust_stop_trace(lsm->pid); | |
607 | ||
608 | /* No auxiliary data so only send the llm struct. */ | |
609 | goto end; | |
610 | } | |
57167058 DG |
611 | case LTTNG_LIST_SESSIONS: |
612 | { | |
5b74c7b1 | 613 | unsigned int session_count = get_session_count(); |
ca95a216 DG |
614 | /* Stop right now if no session */ |
615 | if (session_count == 0) { | |
57167058 | 616 | ret = LTTCOMM_NO_SESS; |
8028d920 | 617 | goto end; |
57167058 DG |
618 | } |
619 | ||
ca95a216 DG |
620 | /* Setup data buffer and details for transmission */ |
621 | buf_size = setup_data_buffer(&send_buf, | |
622 | (sizeof(struct lttng_session) * session_count), &llm); | |
623 | if (buf_size < 0) { | |
624 | ret = LTTCOMM_FATAL; | |
8028d920 | 625 | goto end; |
ca95a216 DG |
626 | } |
627 | ||
5b74c7b1 | 628 | get_lttng_session((struct lttng_session *)(send_buf + header_size)); |
ca95a216 | 629 | |
57167058 DG |
630 | break; |
631 | } | |
fac6795d | 632 | default: |
e065084a | 633 | { |
fac6795d | 634 | /* Undefined command */ |
e065084a | 635 | ret = LTTCOMM_UND; |
8028d920 | 636 | goto end; |
e065084a | 637 | } |
fac6795d DG |
638 | } |
639 | ||
1fd70b72 DG |
640 | ret = send_unix_sock(sock, send_buf, buf_size); |
641 | ||
ca95a216 DG |
642 | if (send_buf != NULL) { |
643 | free(send_buf); | |
644 | } | |
645 | ||
e065084a DG |
646 | return ret; |
647 | ||
8028d920 | 648 | end: |
7442b2ba | 649 | DBG("Return code to client %d", ret); |
e065084a DG |
650 | /* Notify client of error */ |
651 | llm.ret_code = ret; | |
ca95a216 | 652 | llm.size_payload = 0; |
e065084a DG |
653 | send_unix_sock(sock, (void*) &llm, sizeof(llm)); |
654 | ||
8028d920 | 655 | return ret; |
fac6795d DG |
656 | } |
657 | ||
658 | /* | |
659 | * usage function on stderr | |
660 | */ | |
661 | static void usage(void) | |
662 | { | |
b716ce68 DG |
663 | fprintf(stderr, "Usage: %s OPTIONS\n\nOptions:\n", progname); |
664 | fprintf(stderr, " -h, --help Display this usage.\n"); | |
665 | fprintf(stderr, " -c, --client-sock PATH Specify path for the client unix socket\n"); | |
666 | fprintf(stderr, " -a, --apps-sock PATH Specify path for apps unix socket.\n"); | |
667 | fprintf(stderr, " -d, --daemonize Start as a daemon.\n"); | |
668 | fprintf(stderr, " -g, --group NAME Specify the tracing group name. (default: tracing)\n"); | |
669 | fprintf(stderr, " -V, --version Show version number.\n"); | |
670 | fprintf(stderr, " -S, --sig-parent Send SIGCHLD to parent pid to notify readiness.\n"); | |
671 | fprintf(stderr, " -q, --quiet No output at all.\n"); | |
3f9947db | 672 | fprintf(stderr, " -v, --verbose Verbose mode. Activate DBG() macro.\n"); |
fac6795d DG |
673 | } |
674 | ||
675 | /* | |
676 | * daemon argument parsing | |
677 | */ | |
678 | static int parse_args(int argc, char **argv) | |
679 | { | |
680 | int c; | |
681 | ||
682 | static struct option long_options[] = { | |
683 | { "client-sock", 1, 0, 'c' }, | |
684 | { "apps-sock", 1, 0, 'a' }, | |
685 | { "daemonize", 0, 0, 'd' }, | |
5b8719f5 | 686 | { "sig-parent", 0, 0, 'S' }, |
fac6795d DG |
687 | { "help", 0, 0, 'h' }, |
688 | { "group", 1, 0, 'g' }, | |
689 | { "version", 0, 0, 'V' }, | |
75462a81 | 690 | { "quiet", 0, 0, 'q' }, |
3f9947db | 691 | { "verbose", 0, 0, 'v' }, |
fac6795d DG |
692 | { NULL, 0, 0, 0 } |
693 | }; | |
694 | ||
695 | while (1) { | |
696 | int option_index = 0; | |
3f9947db | 697 | c = getopt_long(argc, argv, "dhqvVS" "a:c:g:s:", long_options, &option_index); |
fac6795d DG |
698 | if (c == -1) { |
699 | break; | |
700 | } | |
701 | ||
702 | switch (c) { | |
703 | case 0: | |
704 | fprintf(stderr, "option %s", long_options[option_index].name); | |
705 | if (optarg) { | |
706 | fprintf(stderr, " with arg %s\n", optarg); | |
707 | } | |
708 | break; | |
b716ce68 | 709 | case 'c': |
fac6795d DG |
710 | snprintf(client_unix_sock_path, PATH_MAX, "%s", optarg); |
711 | break; | |
712 | case 'a': | |
713 | snprintf(apps_unix_sock_path, PATH_MAX, "%s", optarg); | |
714 | break; | |
715 | case 'd': | |
716 | opt_daemon = 1; | |
717 | break; | |
718 | case 'g': | |
719 | opt_tracing_group = strdup(optarg); | |
720 | break; | |
721 | case 'h': | |
722 | usage(); | |
723 | exit(EXIT_FAILURE); | |
724 | case 'V': | |
725 | fprintf(stdout, "%s\n", VERSION); | |
726 | exit(EXIT_SUCCESS); | |
5b8719f5 DG |
727 | case 'S': |
728 | opt_sig_parent = 1; | |
729 | break; | |
75462a81 DG |
730 | case 'q': |
731 | opt_quiet = 1; | |
732 | break; | |
3f9947db DG |
733 | case 'v': |
734 | opt_verbose = 1; | |
735 | break; | |
fac6795d DG |
736 | default: |
737 | /* Unknown option or other error. | |
738 | * Error is printed by getopt, just return */ | |
739 | return -1; | |
740 | } | |
741 | } | |
742 | ||
743 | return 0; | |
744 | } | |
745 | ||
746 | /* | |
747 | * init_daemon_socket | |
748 | * | |
749 | * Creates the two needed socket by the daemon. | |
62bd06d8 DG |
750 | * apps_socket - The communication socket for all UST apps. |
751 | * client_socket - The communication of the cli tool (lttng). | |
fac6795d DG |
752 | */ |
753 | static int init_daemon_socket() | |
754 | { | |
755 | int ret = 0; | |
756 | mode_t old_umask; | |
757 | ||
758 | old_umask = umask(0); | |
759 | ||
760 | /* Create client tool unix socket */ | |
761 | client_socket = lttcomm_create_unix_sock(client_unix_sock_path); | |
762 | if (client_socket < 0) { | |
763 | ret = -1; | |
764 | goto end; | |
765 | } | |
766 | ||
767 | /* File permission MUST be 660 */ | |
768 | ret = chmod(client_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); | |
769 | if (ret < 0) { | |
770 | perror("chmod"); | |
771 | goto end; | |
772 | } | |
773 | ||
774 | /* Create the application unix socket */ | |
775 | apps_socket = lttcomm_create_unix_sock(apps_unix_sock_path); | |
776 | if (apps_socket < 0) { | |
777 | ret = -1; | |
778 | goto end; | |
779 | } | |
780 | ||
781 | /* File permission MUST be 660 */ | |
782 | ret = chmod(apps_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH); | |
783 | if (ret < 0) { | |
784 | perror("chmod"); | |
785 | goto end; | |
786 | } | |
787 | ||
788 | end: | |
789 | umask(old_umask); | |
790 | return ret; | |
791 | } | |
792 | ||
793 | /* | |
794 | * check_existing_daemon | |
795 | * | |
796 | * Check if the global socket is available. | |
62bd06d8 | 797 | * If yes, error is returned. |
fac6795d DG |
798 | */ |
799 | static int check_existing_daemon() | |
800 | { | |
801 | int ret; | |
802 | ||
803 | ret = access(client_unix_sock_path, F_OK); | |
804 | if (ret == 0) { | |
805 | ret = access(apps_unix_sock_path, F_OK); | |
806 | } | |
807 | ||
808 | return ret; | |
809 | } | |
810 | ||
811 | /* | |
62bd06d8 | 812 | * get_home_dir |
fac6795d | 813 | * |
62bd06d8 DG |
814 | * Return pointer to home directory path using |
815 | * the env variable HOME. | |
fac6795d | 816 | * |
62bd06d8 | 817 | * Default : /tmp |
fac6795d DG |
818 | */ |
819 | static const char *get_home_dir(void) | |
820 | { | |
821 | const char *home_path; | |
822 | ||
686204ab | 823 | if ((home_path = (const char *) getenv("HOME")) == NULL) { |
fac6795d DG |
824 | home_path = default_home_dir; |
825 | } | |
826 | ||
827 | return home_path; | |
828 | } | |
829 | ||
830 | /* | |
831 | * set_socket_perms | |
832 | * | |
833 | * Set the tracing group gid onto the client socket. | |
834 | */ | |
835 | static int set_socket_perms(void) | |
836 | { | |
837 | int ret; | |
838 | struct group *grp; | |
839 | ||
840 | /* Decide which group name to use */ | |
841 | (opt_tracing_group != NULL) ? | |
842 | (grp = getgrnam(opt_tracing_group)) : | |
843 | (grp = getgrnam(default_tracing_group)); | |
844 | ||
845 | if (grp == NULL) { | |
75462a81 | 846 | ERR("Missing tracing group. Aborting execution.\n"); |
fac6795d DG |
847 | ret = -1; |
848 | goto end; | |
849 | } | |
850 | ||
851 | ret = chown(client_unix_sock_path, 0, grp->gr_gid); | |
852 | if (ret < 0) { | |
853 | perror("chown"); | |
854 | } | |
855 | ||
e07ae692 DG |
856 | DBG("Sockets permissions set"); |
857 | ||
fac6795d DG |
858 | end: |
859 | return ret; | |
860 | } | |
861 | ||
fac6795d | 862 | /* |
62bd06d8 | 863 | * set_signal_handler |
fac6795d | 864 | * |
62bd06d8 | 865 | * Setup signal handler for : |
fac6795d DG |
866 | * SIGINT, SIGTERM, SIGPIPE |
867 | */ | |
868 | static int set_signal_handler(void) | |
869 | { | |
870 | int ret = 0; | |
871 | struct sigaction sa; | |
872 | sigset_t sigset; | |
873 | ||
874 | if ((ret = sigemptyset(&sigset)) < 0) { | |
875 | perror("sigemptyset"); | |
876 | return ret; | |
877 | } | |
878 | ||
879 | sa.sa_handler = sighandler; | |
880 | sa.sa_mask = sigset; | |
881 | sa.sa_flags = 0; | |
882 | if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) { | |
883 | perror("sigaction"); | |
884 | return ret; | |
885 | } | |
886 | ||
887 | if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) { | |
888 | perror("sigaction"); | |
889 | return ret; | |
890 | } | |
891 | ||
892 | if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) { | |
893 | perror("sigaction"); | |
894 | return ret; | |
895 | } | |
896 | ||
e07ae692 DG |
897 | DBG("Signal handler set for SIGTERM, SIGPIPE and SIGINT"); |
898 | ||
fac6795d DG |
899 | return ret; |
900 | } | |
901 | ||
902 | /** | |
62bd06d8 | 903 | * sighandler |
fac6795d | 904 | * |
62bd06d8 | 905 | * Signal handler for the daemon |
fac6795d DG |
906 | */ |
907 | static void sighandler(int sig) | |
908 | { | |
909 | switch (sig) { | |
910 | case SIGPIPE: | |
e07ae692 | 911 | DBG("SIGPIPE catched"); |
87378cf5 | 912 | return; |
fac6795d | 913 | case SIGINT: |
e07ae692 DG |
914 | DBG("SIGINT catched"); |
915 | cleanup(); | |
916 | break; | |
fac6795d | 917 | case SIGTERM: |
e07ae692 | 918 | DBG("SIGTERM catched"); |
fac6795d | 919 | cleanup(); |
686204ab | 920 | break; |
fac6795d DG |
921 | default: |
922 | break; | |
923 | } | |
924 | ||
925 | exit(EXIT_SUCCESS); | |
926 | } | |
927 | ||
928 | /* | |
62bd06d8 | 929 | * cleanup |
fac6795d | 930 | * |
62bd06d8 | 931 | * Cleanup the daemon on exit |
fac6795d DG |
932 | */ |
933 | static void cleanup() | |
934 | { | |
e07ae692 DG |
935 | DBG("Cleaning up"); |
936 | ||
fac6795d | 937 | /* <fun> */ |
b716ce68 DG |
938 | MSG("\n%c[%d;%dm*** assert failed *** ==> %c[%dm", 27,1,31,27,0); |
939 | MSG("%c[%d;%dmMatthew, BEET driven development works!%c[%dm",27,1,33,27,0); | |
fac6795d DG |
940 | /* </fun> */ |
941 | ||
942 | unlink(client_unix_sock_path); | |
943 | unlink(apps_unix_sock_path); | |
944 | } | |
945 | ||
946 | /* | |
947 | * main | |
948 | */ | |
949 | int main(int argc, char **argv) | |
950 | { | |
951 | int i; | |
952 | int ret = 0; | |
953 | void *status; | |
954 | pthread_t threads[2]; | |
955 | ||
956 | /* Parse arguments */ | |
957 | progname = argv[0]; | |
958 | if ((ret = parse_args(argc, argv) < 0)) { | |
959 | goto error; | |
960 | } | |
961 | ||
962 | /* Daemonize */ | |
963 | if (opt_daemon) { | |
53094c05 DG |
964 | ret = daemon(0, 0); |
965 | if (ret < 0) { | |
966 | perror("daemon"); | |
967 | goto error; | |
968 | } | |
fac6795d DG |
969 | } |
970 | ||
971 | /* Check if daemon is UID = 0 */ | |
972 | is_root = !getuid(); | |
973 | ||
974 | /* Set all sockets path */ | |
975 | if (is_root) { | |
976 | if (strlen(apps_unix_sock_path) == 0) { | |
977 | (snprintf(apps_unix_sock_path, PATH_MAX, | |
978 | DEFAULT_GLOBAL_APPS_UNIX_SOCK)); | |
979 | } | |
980 | ||
981 | if (strlen(client_unix_sock_path) == 0) { | |
982 | (snprintf(client_unix_sock_path, PATH_MAX, | |
983 | DEFAULT_GLOBAL_CLIENT_UNIX_SOCK)); | |
984 | } | |
985 | } else { | |
986 | if (strlen(apps_unix_sock_path) == 0) { | |
987 | (snprintf(apps_unix_sock_path, PATH_MAX, | |
988 | DEFAULT_HOME_APPS_UNIX_SOCK, get_home_dir())); | |
989 | } | |
990 | ||
991 | /* Set the cli tool unix socket path */ | |
992 | if (strlen(client_unix_sock_path) == 0) { | |
993 | (snprintf(client_unix_sock_path, PATH_MAX, | |
994 | DEFAULT_HOME_CLIENT_UNIX_SOCK, get_home_dir())); | |
995 | } | |
996 | } | |
997 | ||
998 | /* See if daemon already exist. If any of the two | |
999 | * socket needed by the daemon are present, this test fails | |
1000 | */ | |
1001 | if ((ret = check_existing_daemon()) == 0) { | |
75462a81 | 1002 | ERR("Already running daemon.\n"); |
ab118b20 DG |
1003 | /* We do not goto error because we must not |
1004 | * cleanup() because a daemon is already working. | |
1005 | */ | |
1006 | return EXIT_FAILURE; | |
fac6795d DG |
1007 | } |
1008 | ||
1009 | if (set_signal_handler() < 0) { | |
1010 | goto error; | |
1011 | } | |
1012 | ||
1013 | /* Setup the two needed unix socket */ | |
1014 | if (init_daemon_socket() < 0) { | |
1015 | goto error; | |
1016 | } | |
1017 | ||
1018 | /* Set credentials to socket */ | |
1019 | if (is_root && (set_socket_perms() < 0)) { | |
1020 | goto error; | |
1021 | } | |
1022 | ||
5b8719f5 DG |
1023 | /* Get parent pid if -S, --sig-parent is specified. */ |
1024 | if (opt_sig_parent) { | |
1025 | ppid = getppid(); | |
1026 | } | |
1027 | ||
fac6795d DG |
1028 | while (1) { |
1029 | /* Create thread to manage the client socket */ | |
1030 | ret = pthread_create(&threads[0], NULL, thread_manage_clients, (void *) NULL); | |
1031 | if (ret != 0) { | |
1032 | perror("pthread_create"); | |
1033 | goto error; | |
1034 | } | |
1035 | ||
1036 | /* Create thread to manage application socket */ | |
1037 | ret = pthread_create(&threads[1], NULL, thread_manage_apps, (void *) NULL); | |
1038 | if (ret != 0) { | |
1039 | perror("pthread_create"); | |
1040 | goto error; | |
1041 | } | |
1042 | ||
1043 | for (i = 0; i < 2; i++) { | |
1044 | ret = pthread_join(threads[i], &status); | |
1045 | if (ret != 0) { | |
1046 | perror("pthread_join"); | |
1047 | goto error; | |
1048 | } | |
1049 | } | |
1050 | } | |
1051 | ||
1052 | cleanup(); | |
1053 | return 0; | |
1054 | ||
1055 | error: | |
1056 | cleanup(); | |
1057 | ||
1058 | return EXIT_FAILURE; | |
1059 | } |