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" |
5b74c7b1 | 43 | #include "session.h" |
fac6795d | 44 | |
75462a81 | 45 | /* Const values */ |
686204ab MD |
46 | const char default_home_dir[] = DEFAULT_HOME_DIR; |
47 | const char default_tracing_group[] = DEFAULT_TRACING_GROUP; | |
48 | const char default_ust_sock_dir[] = DEFAULT_UST_SOCK_DIR; | |
49 | const char default_global_apps_pipe[] = DEFAULT_GLOBAL_APPS_PIPE; | |
50 | ||
fac6795d DG |
51 | /* Static functions */ |
52 | static int set_signal_handler(void); | |
53 | static int set_socket_perms(void); | |
1fd70b72 | 54 | static void sighandler(int sig); |
fac6795d | 55 | static void cleanup(void); |
e065084a | 56 | static void copy_common_data(struct lttcomm_lttng_msg *llm, struct lttcomm_session_msg *lsm); |
fac6795d | 57 | static int check_existing_daemon(void); |
1fd70b72 DG |
58 | static int notify_apps(const char* name); |
59 | static int connect_app(pid_t pid); | |
379473d2 | 60 | static int find_app_by_pid(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); |
c01bdd9d DG |
65 | static void add_traceable_app(struct ltt_traceable_app *lta); |
66 | static void del_traceable_app(struct ltt_traceable_app *lta); | |
ca95a216 DG |
67 | |
68 | /* Command function */ | |
aaf97519 | 69 | static void get_list_apps(pid_t *pids); |
fac6795d | 70 | |
1fd70b72 DG |
71 | static void *thread_manage_clients(void *data); |
72 | static void *thread_manage_apps(void *data); | |
fac6795d | 73 | |
fac6795d DG |
74 | /* Variables */ |
75 | const char *progname; | |
76 | const char *opt_tracing_group; | |
5b8719f5 | 77 | static int opt_sig_parent; |
fac6795d | 78 | static int opt_daemon; |
75462a81 DG |
79 | int opt_verbose; |
80 | int opt_quiet; | |
fac6795d | 81 | static int is_root; /* Set to 1 if the daemon is running as root */ |
5b8719f5 | 82 | static pid_t ppid; |
fac6795d DG |
83 | |
84 | static char apps_unix_sock_path[PATH_MAX]; /* Global application Unix socket path */ | |
85 | static char client_unix_sock_path[PATH_MAX]; /* Global client Unix socket path */ | |
86 | ||
87 | static int client_socket; | |
88 | static int apps_socket; | |
89 | ||
90 | static struct ltt_session *current_session; | |
e065084a DG |
91 | |
92 | /* Number of element for the list below. */ | |
e065084a | 93 | static unsigned int traceable_app_count; |
fac6795d | 94 | |
e065084a | 95 | /* Init ust traceabl application's list */ |
fac6795d DG |
96 | static struct ltt_traceable_app_list ltt_traceable_app_list = { |
97 | .head = CDS_LIST_HEAD_INIT(ltt_traceable_app_list.head), | |
98 | }; | |
99 | ||
c01bdd9d DG |
100 | /* List mutex */ |
101 | pthread_mutex_t ltt_traceable_app_list_mutex; | |
102 | ||
fac6795d DG |
103 | /* |
104 | * thread_manage_apps | |
105 | * | |
106 | * This thread manage the application socket communication | |
107 | */ | |
108 | static void *thread_manage_apps(void *data) | |
109 | { | |
110 | int sock, ret; | |
111 | struct ltt_traceable_app *lta; | |
112 | ||
113 | /* TODO: Something more elegant is needed but fine for now */ | |
686204ab | 114 | struct { |
fac6795d | 115 | int reg; /* 1:register, 0:unregister */ |
686204ab MD |
116 | pid_t pid; |
117 | uid_t uid; | |
118 | } reg_msg; | |
fac6795d DG |
119 | |
120 | /* Notify all applications to register */ | |
121 | notify_apps(default_global_apps_pipe); | |
122 | ||
123 | ret = lttcomm_listen_unix_sock(apps_socket); | |
124 | if (ret < 0) { | |
125 | goto error; | |
126 | } | |
127 | ||
128 | while (1) { | |
129 | /* Blocking call, waiting for transmission */ | |
130 | sock = lttcomm_accept_unix_sock(apps_socket); | |
131 | if (sock < 0) { | |
132 | goto error; | |
133 | } | |
134 | ||
135 | /* Basic recv here to handle the very simple data | |
136 | * that the libust send to register (reg_msg). | |
137 | */ | |
138 | ret = recv(sock, ®_msg, sizeof(reg_msg), 0); | |
139 | if (ret < 0) { | |
140 | perror("recv"); | |
141 | continue; | |
142 | } | |
143 | ||
144 | /* Add application to the global traceable list */ | |
145 | if (reg_msg.reg == 1) { | |
146 | /* Registering */ | |
147 | lta = malloc(sizeof(struct ltt_traceable_app)); | |
148 | lta->pid = reg_msg.pid; | |
149 | lta->uid = reg_msg.uid; | |
c01bdd9d | 150 | add_traceable_app(lta); |
fac6795d DG |
151 | } else { |
152 | /* Unregistering */ | |
fac6795d DG |
153 | cds_list_for_each_entry(lta, <t_traceable_app_list.head, list) { |
154 | if (lta->pid == reg_msg.pid && lta->uid == reg_msg.uid) { | |
c01bdd9d | 155 | del_traceable_app(lta); |
379473d2 | 156 | free(lta); |
fac6795d DG |
157 | break; |
158 | } | |
159 | } | |
fac6795d DG |
160 | } |
161 | } | |
162 | ||
163 | error: | |
164 | ||
165 | return NULL; | |
166 | } | |
167 | ||
168 | /* | |
169 | * thread_manage_clients | |
170 | * | |
171 | * This thread manage all clients request using the unix | |
172 | * client socket for communication. | |
173 | */ | |
174 | static void *thread_manage_clients(void *data) | |
175 | { | |
176 | int sock, ret; | |
177 | struct lttcomm_session_msg lsm; | |
fac6795d DG |
178 | |
179 | ret = lttcomm_listen_unix_sock(client_socket); | |
180 | if (ret < 0) { | |
181 | goto error; | |
182 | } | |
183 | ||
5b8719f5 DG |
184 | /* Notify parent pid that we are ready |
185 | * to accept command for client side. | |
186 | */ | |
187 | if (opt_sig_parent) { | |
188 | kill(ppid, SIGCHLD); | |
189 | } | |
190 | ||
fac6795d DG |
191 | while (1) { |
192 | /* Blocking call, waiting for transmission */ | |
193 | sock = lttcomm_accept_unix_sock(client_socket); | |
194 | if (sock < 0) { | |
195 | goto error; | |
196 | } | |
197 | ||
198 | /* | |
199 | * Data is received from the lttng client. The struct | |
200 | * lttcomm_session_msg (lsm) contains the command and data | |
201 | * request of the client. | |
202 | */ | |
203 | ret = lttcomm_recv_unix_sock(sock, &lsm, sizeof(lsm)); | |
87378cf5 | 204 | if (ret <= 0) { |
fac6795d DG |
205 | continue; |
206 | } | |
207 | ||
208 | /* This function dispatch the work to the LTTng or UST libs | |
e065084a DG |
209 | * and then sends back the response to the client. This is needed |
210 | * because there might be more then one lttcomm_lttng_msg to | |
211 | * send out so process_client_msg do both jobs. | |
fac6795d | 212 | */ |
e065084a DG |
213 | ret = process_client_msg(sock, &lsm); |
214 | if (ret < 0) { | |
215 | /* Error detected but still accept command */ | |
216 | continue; | |
fac6795d DG |
217 | } |
218 | } | |
219 | ||
220 | error: | |
221 | return NULL; | |
222 | } | |
223 | ||
c01bdd9d DG |
224 | /* |
225 | * add_traceable_app | |
226 | * | |
227 | * Add a traceable application structure to the global | |
228 | * list protected by a mutex. | |
229 | */ | |
230 | static void add_traceable_app(struct ltt_traceable_app *lta) | |
231 | { | |
232 | pthread_mutex_lock(<t_traceable_app_list_mutex); | |
233 | cds_list_add(<a->list, <t_traceable_app_list.head); | |
234 | traceable_app_count++; | |
235 | pthread_mutex_unlock(<t_traceable_app_list_mutex); | |
236 | } | |
237 | ||
238 | /* | |
239 | * del_traceable_app | |
240 | * | |
241 | * Delete a traceable application structure from the | |
242 | * global list protected by a mutex. | |
243 | */ | |
244 | static void del_traceable_app(struct ltt_traceable_app *lta) | |
245 | { | |
246 | pthread_mutex_lock(<t_traceable_app_list_mutex); | |
247 | cds_list_del(<a->list); | |
248 | /* Sanity check */ | |
249 | if (traceable_app_count != 0) { | |
250 | traceable_app_count--; | |
251 | } | |
252 | pthread_mutex_unlock(<t_traceable_app_list_mutex); | |
253 | } | |
254 | ||
e065084a DG |
255 | /* |
256 | * send_unix_sock | |
257 | * | |
258 | * Send data on a unix socket using the liblttsessiondcomm API. | |
259 | * | |
260 | * Return lttcomm error code. | |
261 | */ | |
262 | static int send_unix_sock(int sock, void *buf, size_t len) | |
263 | { | |
264 | /* Check valid length */ | |
265 | if (len <= 0) { | |
266 | return -1; | |
267 | } | |
268 | ||
269 | return lttcomm_send_unix_sock(sock, buf, len); | |
270 | } | |
271 | ||
fac6795d DG |
272 | /* |
273 | * connect_app | |
274 | * | |
275 | * Return a socket connected to the libust communication socket | |
276 | * of the application identified by the pid. | |
379473d2 DG |
277 | * |
278 | * If the pid is not found in the traceable list, | |
279 | * return -1 to indicate error. | |
fac6795d DG |
280 | */ |
281 | static int connect_app(pid_t pid) | |
282 | { | |
379473d2 DG |
283 | int sock, ret; |
284 | ||
285 | ret = find_app_by_pid(pid); | |
286 | if (ret == 0) { | |
287 | return -1; | |
288 | } | |
fac6795d DG |
289 | |
290 | sock = ustctl_connect_pid(pid); | |
291 | if (sock < 0) { | |
75462a81 | 292 | ERR("Fail connecting to the PID %d\n", pid); |
fac6795d DG |
293 | } |
294 | ||
295 | return sock; | |
296 | } | |
297 | ||
298 | /* | |
299 | * notify_apps | |
300 | * | |
301 | * Notify apps by writing 42 to a named pipe using name. | |
302 | * Every applications waiting for a ltt-sessiond will be notified | |
303 | * and re-register automatically to the session daemon. | |
304 | * | |
305 | * Return open or write error value. | |
306 | */ | |
307 | static int notify_apps(const char *name) | |
308 | { | |
309 | int fd; | |
310 | int ret = -1; | |
311 | ||
312 | /* Try opening the global pipe */ | |
313 | fd = open(name, O_WRONLY); | |
314 | if (fd < 0) { | |
315 | goto error; | |
316 | } | |
317 | ||
318 | /* Notify by writing on the pipe */ | |
319 | ret = write(fd, "42", 2); | |
320 | if (ret < 0) { | |
321 | perror("write"); | |
322 | } | |
323 | ||
324 | error: | |
325 | return ret; | |
326 | } | |
327 | ||
379473d2 DG |
328 | /* |
329 | * find_app_by_pid | |
330 | * | |
331 | * Iterate over the traceable apps list. | |
332 | * On success, return 1, else return 0 | |
333 | */ | |
334 | static int find_app_by_pid(pid_t pid) | |
335 | { | |
336 | struct ltt_traceable_app *iter; | |
337 | ||
c01bdd9d | 338 | pthread_mutex_lock(<t_traceable_app_list_mutex); |
379473d2 DG |
339 | cds_list_for_each_entry(iter, <t_traceable_app_list.head, list) { |
340 | if (iter->pid == pid) { | |
c01bdd9d | 341 | pthread_mutex_unlock(<t_traceable_app_list_mutex); |
379473d2 DG |
342 | /* Found */ |
343 | return 1; | |
344 | } | |
345 | } | |
c01bdd9d | 346 | pthread_mutex_unlock(<t_traceable_app_list_mutex); |
379473d2 DG |
347 | |
348 | return 0; | |
349 | } | |
350 | ||
379473d2 DG |
351 | /* |
352 | * ust_create_trace | |
353 | * | |
354 | * Create an userspace trace using pid. | |
355 | * This trace is then appended to the current session | |
356 | * ust trace list. | |
357 | */ | |
358 | static int ust_create_trace(pid_t pid) | |
359 | { | |
360 | int sock, ret; | |
361 | struct ltt_ust_trace *trace; | |
362 | ||
363 | trace = malloc(sizeof(struct ltt_ust_trace)); | |
364 | if (trace == NULL) { | |
365 | perror("malloc"); | |
366 | ret = -1; | |
367 | goto error; | |
368 | } | |
369 | ||
370 | /* Init */ | |
371 | trace->pid = pid; | |
372 | trace->shmid = 0; | |
373 | ||
374 | /* Connect to app using ustctl API */ | |
375 | sock = connect_app(pid); | |
376 | if (sock < 0) { | |
377 | ret = LTTCOMM_NO_TRACEABLE; | |
378 | goto error; | |
379 | } | |
380 | ||
381 | ret = ustctl_create_trace(sock, "auto"); | |
382 | if (ret < 0) { | |
383 | ret = LTTCOMM_CREATE_FAIL; | |
384 | goto error; | |
385 | } | |
386 | ||
387 | /* Check if current session is valid */ | |
388 | if (current_session) { | |
389 | cds_list_add(&trace->list, ¤t_session->ust_traces); | |
390 | } | |
391 | ||
392 | error: | |
393 | return ret; | |
394 | } | |
395 | ||
fac6795d | 396 | /* |
ca95a216 | 397 | * get_list_apps |
fac6795d DG |
398 | * |
399 | * List traceable user-space application and fill an | |
400 | * array of pids. | |
fac6795d | 401 | */ |
aaf97519 | 402 | static void get_list_apps(pid_t *pids) |
fac6795d | 403 | { |
aaf97519 DG |
404 | int i = 0; |
405 | struct ltt_traceable_app *iter; | |
fac6795d | 406 | |
c01bdd9d DG |
407 | /* Protected by a mutex here because the threads manage_client |
408 | * and manage_apps can access this list. | |
409 | */ | |
410 | pthread_mutex_lock(<t_traceable_app_list_mutex); | |
e065084a | 411 | cds_list_for_each_entry(iter, <t_traceable_app_list.head, list) { |
aaf97519 DG |
412 | pids[i] = iter->pid; |
413 | i++; | |
fac6795d | 414 | } |
c01bdd9d | 415 | pthread_mutex_unlock(<t_traceable_app_list_mutex); |
ca95a216 | 416 | } |
fac6795d | 417 | |
e065084a DG |
418 | /* |
419 | * copy_common_data | |
420 | * | |
421 | * Copy common data between lttcomm_lttng_msg and lttcomm_session_msg | |
422 | */ | |
423 | static void copy_common_data(struct lttcomm_lttng_msg *llm, struct lttcomm_session_msg *lsm) | |
424 | { | |
425 | llm->cmd_type = lsm->cmd_type; | |
426 | llm->pid = lsm->pid; | |
aaf97519 DG |
427 | |
428 | /* Manage uuid */ | |
8028d920 DG |
429 | if (!uuid_is_null(lsm->session_id)) { |
430 | uuid_copy(llm->session_id, lsm->session_id); | |
e065084a | 431 | } |
aaf97519 DG |
432 | |
433 | strncpy(llm->trace_name, lsm->trace_name, strlen(llm->trace_name)); | |
8028d920 | 434 | llm->trace_name[strlen(llm->trace_name) - 1] = '\0'; |
e065084a DG |
435 | } |
436 | ||
ca95a216 DG |
437 | /* |
438 | * setup_data_buffer | |
439 | * | |
440 | * Setup the outgoing data buffer for the response | |
441 | * data allocating the right amount of memory. | |
442 | * | |
443 | * Return total size of the buffer pointed by buf. | |
444 | */ | |
aaf97519 | 445 | static int setup_data_buffer(char **buf, size_t s_data, struct lttcomm_lttng_msg *llm) |
ca95a216 DG |
446 | { |
447 | int ret = 0; | |
ca95a216 DG |
448 | size_t buf_size; |
449 | ||
450 | buf_size = sizeof(struct lttcomm_lttng_msg) + s_data; | |
aaf97519 DG |
451 | *buf = malloc(buf_size); |
452 | if (*buf == NULL) { | |
ca95a216 DG |
453 | perror("malloc"); |
454 | ret = -1; | |
455 | goto error; | |
456 | } | |
457 | ||
458 | /* Setup lttcomm_lttng_msg data and copy | |
459 | * it to the newly allocated buffer. | |
460 | */ | |
461 | llm->size_payload = s_data; | |
aaf97519 | 462 | memcpy(*buf, llm, sizeof(struct lttcomm_lttng_msg)); |
ca95a216 DG |
463 | |
464 | return buf_size; | |
465 | ||
466 | error: | |
467 | return ret; | |
468 | } | |
469 | ||
fac6795d DG |
470 | /* |
471 | * process_client_msg | |
472 | * | |
473 | * This takes the lttcomm_session_msg struct and process the command requested | |
e065084a DG |
474 | * by the client. It then creates response(s) and send it back to the |
475 | * given socket (sock). | |
fac6795d | 476 | * |
e065084a | 477 | * Return any error encountered or 0 for success. |
fac6795d | 478 | */ |
e065084a | 479 | static int process_client_msg(int sock, struct lttcomm_session_msg *lsm) |
fac6795d | 480 | { |
e065084a | 481 | int ret; |
ca95a216 | 482 | int buf_size; |
7e6e59cd | 483 | size_t header_size; |
aaf97519 DG |
484 | char *send_buf = NULL; |
485 | struct lttcomm_lttng_msg llm; | |
fac6795d DG |
486 | |
487 | /* Copy common data to identify the response | |
488 | * on the lttng client side. | |
489 | */ | |
e065084a | 490 | copy_common_data(&llm, lsm); |
fac6795d | 491 | |
379473d2 DG |
492 | /* Check command that needs a session */ |
493 | if (lsm->cmd_type != LTTNG_CREATE_SESSION && | |
494 | lsm->cmd_type != LTTNG_LIST_SESSIONS && | |
495 | lsm->cmd_type != UST_LIST_APPS) | |
496 | { | |
497 | current_session = find_session_by_uuid(lsm->session_id); | |
498 | if (current_session == NULL) { | |
499 | ret = LTTCOMM_SELECT_SESS; | |
500 | goto end; | |
501 | } | |
502 | } | |
503 | ||
fac6795d | 504 | /* Default return code. |
e065084a | 505 | * In our world, everything is OK... right? ;) |
fac6795d | 506 | */ |
e065084a | 507 | llm.ret_code = LTTCOMM_OK; |
fac6795d | 508 | |
7e6e59cd DG |
509 | header_size = sizeof(struct lttcomm_lttng_msg); |
510 | ||
fac6795d DG |
511 | /* Process by command type */ |
512 | switch (lsm->cmd_type) { | |
aaf97519 DG |
513 | case LTTNG_CREATE_SESSION: |
514 | { | |
8028d920 | 515 | ret = create_session(lsm->session_name, &llm.session_id); |
aaf97519 | 516 | if (ret < 0) { |
27673bb6 DG |
517 | if (ret == -1) { |
518 | ret = LTTCOMM_EXIST_SESS; | |
519 | } else { | |
520 | ret = LTTCOMM_FATAL; | |
521 | } | |
8028d920 | 522 | goto end; |
aaf97519 DG |
523 | } |
524 | ||
aaf97519 DG |
525 | buf_size = setup_data_buffer(&send_buf, 0, &llm); |
526 | if (buf_size < 0) { | |
527 | ret = LTTCOMM_FATAL; | |
8028d920 | 528 | goto end; |
aaf97519 DG |
529 | } |
530 | ||
aaf97519 DG |
531 | break; |
532 | } | |
8028d920 DG |
533 | case LTTNG_DESTROY_SESSION: |
534 | { | |
535 | ret = destroy_session(&lsm->session_id); | |
536 | if (ret < 0) { | |
537 | ret = LTTCOMM_NO_SESS; | |
538 | } else { | |
539 | ret = LTTCOMM_OK; | |
540 | } | |
541 | ||
542 | /* No auxiliary data so only send the llm struct. */ | |
543 | goto end; | |
544 | } | |
df0da139 DG |
545 | case UST_CREATE_TRACE: |
546 | { | |
379473d2 | 547 | ret = ust_create_trace(lsm->pid); |
df0da139 DG |
548 | if (ret < 0) { |
549 | ret = LTTCOMM_CREATE_FAIL; | |
379473d2 | 550 | goto end; |
df0da139 DG |
551 | } |
552 | ||
379473d2 | 553 | /* No auxiliary data so only send the llm struct. */ |
df0da139 DG |
554 | goto end; |
555 | } | |
fac6795d DG |
556 | case UST_LIST_APPS: |
557 | { | |
ca95a216 DG |
558 | /* Stop right now if no apps */ |
559 | if (traceable_app_count == 0) { | |
e065084a | 560 | ret = LTTCOMM_NO_APPS; |
8028d920 | 561 | goto end; |
e065084a DG |
562 | } |
563 | ||
ca95a216 DG |
564 | /* Setup data buffer and details for transmission */ |
565 | buf_size = setup_data_buffer(&send_buf, | |
566 | sizeof(pid_t) * traceable_app_count, &llm); | |
567 | if (buf_size < 0) { | |
568 | ret = LTTCOMM_FATAL; | |
8028d920 | 569 | goto end; |
ca95a216 DG |
570 | } |
571 | ||
7e6e59cd | 572 | get_list_apps((pid_t *)(send_buf + header_size)); |
ca95a216 | 573 | |
fac6795d DG |
574 | break; |
575 | } | |
57167058 DG |
576 | case LTTNG_LIST_SESSIONS: |
577 | { | |
5b74c7b1 | 578 | unsigned int session_count = get_session_count(); |
ca95a216 DG |
579 | /* Stop right now if no session */ |
580 | if (session_count == 0) { | |
57167058 | 581 | ret = LTTCOMM_NO_SESS; |
8028d920 | 582 | goto end; |
57167058 DG |
583 | } |
584 | ||
ca95a216 DG |
585 | /* Setup data buffer and details for transmission */ |
586 | buf_size = setup_data_buffer(&send_buf, | |
587 | (sizeof(struct lttng_session) * session_count), &llm); | |
588 | if (buf_size < 0) { | |
589 | ret = LTTCOMM_FATAL; | |
8028d920 | 590 | goto end; |
ca95a216 DG |
591 | } |
592 | ||
5b74c7b1 | 593 | get_lttng_session((struct lttng_session *)(send_buf + header_size)); |
ca95a216 | 594 | |
57167058 DG |
595 | break; |
596 | } | |
fac6795d | 597 | default: |
e065084a | 598 | { |
fac6795d | 599 | /* Undefined command */ |
e065084a | 600 | ret = LTTCOMM_UND; |
8028d920 | 601 | goto end; |
e065084a | 602 | } |
fac6795d DG |
603 | } |
604 | ||
1fd70b72 DG |
605 | ret = send_unix_sock(sock, send_buf, buf_size); |
606 | ||
ca95a216 DG |
607 | if (send_buf != NULL) { |
608 | free(send_buf); | |
609 | } | |
610 | ||
e065084a DG |
611 | return ret; |
612 | ||
8028d920 | 613 | end: |
e065084a DG |
614 | /* Notify client of error */ |
615 | llm.ret_code = ret; | |
ca95a216 | 616 | llm.size_payload = 0; |
e065084a DG |
617 | send_unix_sock(sock, (void*) &llm, sizeof(llm)); |
618 | ||
8028d920 | 619 | return ret; |
fac6795d DG |
620 | } |
621 | ||
622 | /* | |
623 | * usage function on stderr | |
624 | */ | |
625 | static void usage(void) | |
626 | { | |
b716ce68 DG |
627 | fprintf(stderr, "Usage: %s OPTIONS\n\nOptions:\n", progname); |
628 | fprintf(stderr, " -h, --help Display this usage.\n"); | |
629 | fprintf(stderr, " -c, --client-sock PATH Specify path for the client unix socket\n"); | |
630 | fprintf(stderr, " -a, --apps-sock PATH Specify path for apps unix socket.\n"); | |
631 | fprintf(stderr, " -d, --daemonize Start as a daemon.\n"); | |
632 | fprintf(stderr, " -g, --group NAME Specify the tracing group name. (default: tracing)\n"); | |
633 | fprintf(stderr, " -V, --version Show version number.\n"); | |
634 | fprintf(stderr, " -S, --sig-parent Send SIGCHLD to parent pid to notify readiness.\n"); | |
635 | fprintf(stderr, " -q, --quiet No output at all.\n"); | |
fac6795d DG |
636 | } |
637 | ||
638 | /* | |
639 | * daemon argument parsing | |
640 | */ | |
641 | static int parse_args(int argc, char **argv) | |
642 | { | |
643 | int c; | |
644 | ||
645 | static struct option long_options[] = { | |
646 | { "client-sock", 1, 0, 'c' }, | |
647 | { "apps-sock", 1, 0, 'a' }, | |
648 | { "daemonize", 0, 0, 'd' }, | |
5b8719f5 | 649 | { "sig-parent", 0, 0, 'S' }, |
fac6795d DG |
650 | { "help", 0, 0, 'h' }, |
651 | { "group", 1, 0, 'g' }, | |
652 | { "version", 0, 0, 'V' }, | |
75462a81 | 653 | { "quiet", 0, 0, 'q' }, |
fac6795d DG |
654 | { NULL, 0, 0, 0 } |
655 | }; | |
656 | ||
657 | while (1) { | |
658 | int option_index = 0; | |
75462a81 | 659 | c = getopt_long(argc, argv, "dhqVS" "a:c:g:s:", long_options, &option_index); |
fac6795d DG |
660 | if (c == -1) { |
661 | break; | |
662 | } | |
663 | ||
664 | switch (c) { | |
665 | case 0: | |
666 | fprintf(stderr, "option %s", long_options[option_index].name); | |
667 | if (optarg) { | |
668 | fprintf(stderr, " with arg %s\n", optarg); | |
669 | } | |
670 | break; | |
b716ce68 | 671 | case 'c': |
fac6795d DG |
672 | snprintf(client_unix_sock_path, PATH_MAX, "%s", optarg); |
673 | break; | |
674 | case 'a': | |
675 | snprintf(apps_unix_sock_path, PATH_MAX, "%s", optarg); | |
676 | break; | |
677 | case 'd': | |
678 | opt_daemon = 1; | |
679 | break; | |
680 | case 'g': | |
681 | opt_tracing_group = strdup(optarg); | |
682 | break; | |
683 | case 'h': | |
684 | usage(); | |
685 | exit(EXIT_FAILURE); | |
686 | case 'V': | |
687 | fprintf(stdout, "%s\n", VERSION); | |
688 | exit(EXIT_SUCCESS); | |
5b8719f5 DG |
689 | case 'S': |
690 | opt_sig_parent = 1; | |
691 | break; | |
75462a81 DG |
692 | case 'q': |
693 | opt_quiet = 1; | |
694 | break; | |
fac6795d DG |
695 | default: |
696 | /* Unknown option or other error. | |
697 | * Error is printed by getopt, just return */ | |
698 | return -1; | |
699 | } | |
700 | } | |
701 | ||
702 | return 0; | |
703 | } | |
704 | ||
705 | /* | |
706 | * init_daemon_socket | |
707 | * | |
708 | * Creates the two needed socket by the daemon. | |
709 | * apps_socket - The communication socket for all UST apps. | |
710 | * client_socket - The communication of the cli tool (lttng). | |
711 | */ | |
712 | static int init_daemon_socket() | |
713 | { | |
714 | int ret = 0; | |
715 | mode_t old_umask; | |
716 | ||
717 | old_umask = umask(0); | |
718 | ||
719 | /* Create client tool unix socket */ | |
720 | client_socket = lttcomm_create_unix_sock(client_unix_sock_path); | |
721 | if (client_socket < 0) { | |
722 | ret = -1; | |
723 | goto end; | |
724 | } | |
725 | ||
726 | /* File permission MUST be 660 */ | |
727 | ret = chmod(client_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); | |
728 | if (ret < 0) { | |
729 | perror("chmod"); | |
730 | goto end; | |
731 | } | |
732 | ||
733 | /* Create the application unix socket */ | |
734 | apps_socket = lttcomm_create_unix_sock(apps_unix_sock_path); | |
735 | if (apps_socket < 0) { | |
736 | ret = -1; | |
737 | goto end; | |
738 | } | |
739 | ||
740 | /* File permission MUST be 660 */ | |
741 | ret = chmod(apps_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH); | |
742 | if (ret < 0) { | |
743 | perror("chmod"); | |
744 | goto end; | |
745 | } | |
746 | ||
747 | end: | |
748 | umask(old_umask); | |
749 | return ret; | |
750 | } | |
751 | ||
752 | /* | |
753 | * check_existing_daemon | |
754 | * | |
755 | * Check if the global socket is available. | |
756 | * If yes, error is returned. | |
757 | */ | |
758 | static int check_existing_daemon() | |
759 | { | |
760 | int ret; | |
761 | ||
762 | ret = access(client_unix_sock_path, F_OK); | |
763 | if (ret == 0) { | |
764 | ret = access(apps_unix_sock_path, F_OK); | |
765 | } | |
766 | ||
767 | return ret; | |
768 | } | |
769 | ||
770 | /* | |
771 | * get_home_dir | |
772 | * | |
773 | * Return pointer to home directory path using | |
774 | * the env variable HOME. | |
775 | * | |
776 | * Default : /tmp | |
777 | */ | |
778 | static const char *get_home_dir(void) | |
779 | { | |
780 | const char *home_path; | |
781 | ||
686204ab | 782 | if ((home_path = (const char *) getenv("HOME")) == NULL) { |
fac6795d DG |
783 | home_path = default_home_dir; |
784 | } | |
785 | ||
786 | return home_path; | |
787 | } | |
788 | ||
789 | /* | |
790 | * set_socket_perms | |
791 | * | |
792 | * Set the tracing group gid onto the client socket. | |
793 | */ | |
794 | static int set_socket_perms(void) | |
795 | { | |
796 | int ret; | |
797 | struct group *grp; | |
798 | ||
799 | /* Decide which group name to use */ | |
800 | (opt_tracing_group != NULL) ? | |
801 | (grp = getgrnam(opt_tracing_group)) : | |
802 | (grp = getgrnam(default_tracing_group)); | |
803 | ||
804 | if (grp == NULL) { | |
75462a81 | 805 | ERR("Missing tracing group. Aborting execution.\n"); |
fac6795d DG |
806 | ret = -1; |
807 | goto end; | |
808 | } | |
809 | ||
810 | ret = chown(client_unix_sock_path, 0, grp->gr_gid); | |
811 | if (ret < 0) { | |
812 | perror("chown"); | |
813 | } | |
814 | ||
815 | end: | |
816 | return ret; | |
817 | } | |
818 | ||
fac6795d DG |
819 | /* |
820 | * set_signal_handler | |
821 | * | |
822 | * Setup signal handler for : | |
823 | * SIGINT, SIGTERM, SIGPIPE | |
824 | */ | |
825 | static int set_signal_handler(void) | |
826 | { | |
827 | int ret = 0; | |
828 | struct sigaction sa; | |
829 | sigset_t sigset; | |
830 | ||
831 | if ((ret = sigemptyset(&sigset)) < 0) { | |
832 | perror("sigemptyset"); | |
833 | return ret; | |
834 | } | |
835 | ||
836 | sa.sa_handler = sighandler; | |
837 | sa.sa_mask = sigset; | |
838 | sa.sa_flags = 0; | |
839 | if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) { | |
840 | perror("sigaction"); | |
841 | return ret; | |
842 | } | |
843 | ||
844 | if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) { | |
845 | perror("sigaction"); | |
846 | return ret; | |
847 | } | |
848 | ||
849 | if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) { | |
850 | perror("sigaction"); | |
851 | return ret; | |
852 | } | |
853 | ||
854 | return ret; | |
855 | } | |
856 | ||
857 | /** | |
858 | * sighandler | |
859 | * | |
860 | * Signal handler for the daemon | |
861 | */ | |
862 | static void sighandler(int sig) | |
863 | { | |
864 | switch (sig) { | |
865 | case SIGPIPE: | |
87378cf5 | 866 | return; |
fac6795d DG |
867 | case SIGINT: |
868 | case SIGTERM: | |
869 | cleanup(); | |
686204ab | 870 | break; |
fac6795d DG |
871 | default: |
872 | break; | |
873 | } | |
874 | ||
875 | exit(EXIT_SUCCESS); | |
876 | } | |
877 | ||
878 | /* | |
879 | * cleanup | |
880 | * | |
881 | * Cleanup the daemon on exit | |
882 | */ | |
883 | static void cleanup() | |
884 | { | |
885 | /* <fun> */ | |
b716ce68 DG |
886 | MSG("\n%c[%d;%dm*** assert failed *** ==> %c[%dm", 27,1,31,27,0); |
887 | MSG("%c[%d;%dmMatthew, BEET driven development works!%c[%dm",27,1,33,27,0); | |
fac6795d DG |
888 | /* </fun> */ |
889 | ||
890 | unlink(client_unix_sock_path); | |
891 | unlink(apps_unix_sock_path); | |
892 | } | |
893 | ||
894 | /* | |
895 | * main | |
896 | */ | |
897 | int main(int argc, char **argv) | |
898 | { | |
899 | int i; | |
900 | int ret = 0; | |
901 | void *status; | |
902 | pthread_t threads[2]; | |
903 | ||
904 | /* Parse arguments */ | |
905 | progname = argv[0]; | |
906 | if ((ret = parse_args(argc, argv) < 0)) { | |
907 | goto error; | |
908 | } | |
909 | ||
910 | /* Daemonize */ | |
911 | if (opt_daemon) { | |
53094c05 DG |
912 | ret = daemon(0, 0); |
913 | if (ret < 0) { | |
914 | perror("daemon"); | |
915 | goto error; | |
916 | } | |
fac6795d DG |
917 | } |
918 | ||
919 | /* Check if daemon is UID = 0 */ | |
920 | is_root = !getuid(); | |
921 | ||
922 | /* Set all sockets path */ | |
923 | if (is_root) { | |
924 | if (strlen(apps_unix_sock_path) == 0) { | |
925 | (snprintf(apps_unix_sock_path, PATH_MAX, | |
926 | DEFAULT_GLOBAL_APPS_UNIX_SOCK)); | |
927 | } | |
928 | ||
929 | if (strlen(client_unix_sock_path) == 0) { | |
930 | (snprintf(client_unix_sock_path, PATH_MAX, | |
931 | DEFAULT_GLOBAL_CLIENT_UNIX_SOCK)); | |
932 | } | |
933 | } else { | |
934 | if (strlen(apps_unix_sock_path) == 0) { | |
935 | (snprintf(apps_unix_sock_path, PATH_MAX, | |
936 | DEFAULT_HOME_APPS_UNIX_SOCK, get_home_dir())); | |
937 | } | |
938 | ||
939 | /* Set the cli tool unix socket path */ | |
940 | if (strlen(client_unix_sock_path) == 0) { | |
941 | (snprintf(client_unix_sock_path, PATH_MAX, | |
942 | DEFAULT_HOME_CLIENT_UNIX_SOCK, get_home_dir())); | |
943 | } | |
944 | } | |
945 | ||
946 | /* See if daemon already exist. If any of the two | |
947 | * socket needed by the daemon are present, this test fails | |
948 | */ | |
949 | if ((ret = check_existing_daemon()) == 0) { | |
75462a81 | 950 | ERR("Already running daemon.\n"); |
ab118b20 DG |
951 | /* We do not goto error because we must not |
952 | * cleanup() because a daemon is already working. | |
953 | */ | |
954 | return EXIT_FAILURE; | |
fac6795d DG |
955 | } |
956 | ||
957 | if (set_signal_handler() < 0) { | |
958 | goto error; | |
959 | } | |
960 | ||
961 | /* Setup the two needed unix socket */ | |
962 | if (init_daemon_socket() < 0) { | |
963 | goto error; | |
964 | } | |
965 | ||
966 | /* Set credentials to socket */ | |
967 | if (is_root && (set_socket_perms() < 0)) { | |
968 | goto error; | |
969 | } | |
970 | ||
5b8719f5 DG |
971 | /* Get parent pid if -S, --sig-parent is specified. */ |
972 | if (opt_sig_parent) { | |
973 | ppid = getppid(); | |
974 | } | |
975 | ||
fac6795d DG |
976 | while (1) { |
977 | /* Create thread to manage the client socket */ | |
978 | ret = pthread_create(&threads[0], NULL, thread_manage_clients, (void *) NULL); | |
979 | if (ret != 0) { | |
980 | perror("pthread_create"); | |
981 | goto error; | |
982 | } | |
983 | ||
984 | /* Create thread to manage application socket */ | |
985 | ret = pthread_create(&threads[1], NULL, thread_manage_apps, (void *) NULL); | |
986 | if (ret != 0) { | |
987 | perror("pthread_create"); | |
988 | goto error; | |
989 | } | |
990 | ||
991 | for (i = 0; i < 2; i++) { | |
992 | ret = pthread_join(threads[i], &status); | |
993 | if (ret != 0) { | |
994 | perror("pthread_join"); | |
995 | goto error; | |
996 | } | |
997 | } | |
998 | } | |
999 | ||
1000 | cleanup(); | |
1001 | return 0; | |
1002 | ||
1003 | error: | |
1004 | cleanup(); | |
1005 | ||
1006 | return EXIT_FAILURE; | |
1007 | } |