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) */ | |
38 | ||
39 | #include "liblttsessiondcomm.h" | |
40 | #include "ltt-sessiond.h" | |
75462a81 | 41 | #include "lttngerr.h" |
fac6795d | 42 | |
75462a81 | 43 | /* Const values */ |
686204ab MD |
44 | const char default_home_dir[] = DEFAULT_HOME_DIR; |
45 | const char default_tracing_group[] = DEFAULT_TRACING_GROUP; | |
46 | const char default_ust_sock_dir[] = DEFAULT_UST_SOCK_DIR; | |
47 | const char default_global_apps_pipe[] = DEFAULT_GLOBAL_APPS_PIPE; | |
48 | ||
fac6795d DG |
49 | /* Static functions */ |
50 | static int set_signal_handler(void); | |
51 | static int set_socket_perms(void); | |
52 | static void sighandler(int); | |
fac6795d | 53 | static void cleanup(void); |
e065084a | 54 | static void copy_common_data(struct lttcomm_lttng_msg *llm, struct lttcomm_session_msg *lsm); |
fac6795d DG |
55 | static int check_existing_daemon(void); |
56 | static int notify_apps(const char*); | |
57 | static int connect_app(pid_t); | |
58 | static int init_daemon_socket(void); | |
e065084a DG |
59 | static int process_client_msg(int sock, struct lttcomm_session_msg*); |
60 | static int send_unix_sock(int sock, void *buf, size_t len); | |
57167058 | 61 | static size_t ust_list_apps(pid_t **pids); |
fac6795d DG |
62 | |
63 | static void *thread_manage_clients(void *); | |
64 | static void *thread_manage_apps(void *); | |
65 | ||
66 | static int create_session(const char*, uuid_t *); | |
67 | static void destroy_session(uuid_t); | |
68 | ||
69 | static struct ltt_session *find_session(uuid_t); | |
70 | ||
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 DG |
88 | |
89 | /* Number of element for the list below. */ | |
90 | static unsigned int session_count; | |
91 | static unsigned int traceable_app_count; | |
fac6795d DG |
92 | |
93 | /* Init session's list */ | |
94 | static struct ltt_session_list ltt_session_list = { | |
95 | .head = CDS_LIST_HEAD_INIT(ltt_session_list.head), | |
96 | }; | |
97 | ||
e065084a | 98 | /* Init ust traceabl application's list */ |
fac6795d DG |
99 | static struct ltt_traceable_app_list ltt_traceable_app_list = { |
100 | .head = CDS_LIST_HEAD_INIT(ltt_traceable_app_list.head), | |
101 | }; | |
102 | ||
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; | |
150 | cds_list_add(<a->list, <t_traceable_app_list.head); | |
e065084a | 151 | traceable_app_count++; |
fac6795d DG |
152 | } else { |
153 | /* Unregistering */ | |
154 | lta = NULL; | |
155 | cds_list_for_each_entry(lta, <t_traceable_app_list.head, list) { | |
156 | if (lta->pid == reg_msg.pid && lta->uid == reg_msg.uid) { | |
157 | cds_list_del(<a->list); | |
e065084a DG |
158 | /* Check to not overflow here */ |
159 | if (traceable_app_count != 0) { | |
160 | traceable_app_count--; | |
161 | } | |
fac6795d DG |
162 | break; |
163 | } | |
164 | } | |
165 | ||
166 | /* If an item was found, free it from memory */ | |
167 | if (lta) { | |
168 | free(lta); | |
169 | } | |
170 | } | |
171 | } | |
172 | ||
173 | error: | |
174 | ||
175 | return NULL; | |
176 | } | |
177 | ||
178 | /* | |
179 | * thread_manage_clients | |
180 | * | |
181 | * This thread manage all clients request using the unix | |
182 | * client socket for communication. | |
183 | */ | |
184 | static void *thread_manage_clients(void *data) | |
185 | { | |
186 | int sock, ret; | |
187 | struct lttcomm_session_msg lsm; | |
fac6795d DG |
188 | |
189 | ret = lttcomm_listen_unix_sock(client_socket); | |
190 | if (ret < 0) { | |
191 | goto error; | |
192 | } | |
193 | ||
5b8719f5 DG |
194 | /* Notify parent pid that we are ready |
195 | * to accept command for client side. | |
196 | */ | |
197 | if (opt_sig_parent) { | |
198 | kill(ppid, SIGCHLD); | |
199 | } | |
200 | ||
fac6795d DG |
201 | while (1) { |
202 | /* Blocking call, waiting for transmission */ | |
203 | sock = lttcomm_accept_unix_sock(client_socket); | |
204 | if (sock < 0) { | |
205 | goto error; | |
206 | } | |
207 | ||
208 | /* | |
209 | * Data is received from the lttng client. The struct | |
210 | * lttcomm_session_msg (lsm) contains the command and data | |
211 | * request of the client. | |
212 | */ | |
213 | ret = lttcomm_recv_unix_sock(sock, &lsm, sizeof(lsm)); | |
214 | if (ret < 0) { | |
215 | continue; | |
216 | } | |
217 | ||
218 | /* This function dispatch the work to the LTTng or UST libs | |
e065084a DG |
219 | * and then sends back the response to the client. This is needed |
220 | * because there might be more then one lttcomm_lttng_msg to | |
221 | * send out so process_client_msg do both jobs. | |
fac6795d | 222 | */ |
e065084a DG |
223 | ret = process_client_msg(sock, &lsm); |
224 | if (ret < 0) { | |
225 | /* Error detected but still accept command */ | |
226 | continue; | |
fac6795d DG |
227 | } |
228 | } | |
229 | ||
230 | error: | |
231 | return NULL; | |
232 | } | |
233 | ||
e065084a DG |
234 | /* |
235 | * send_unix_sock | |
236 | * | |
237 | * Send data on a unix socket using the liblttsessiondcomm API. | |
238 | * | |
239 | * Return lttcomm error code. | |
240 | */ | |
241 | static int send_unix_sock(int sock, void *buf, size_t len) | |
242 | { | |
243 | /* Check valid length */ | |
244 | if (len <= 0) { | |
245 | return -1; | |
246 | } | |
247 | ||
248 | return lttcomm_send_unix_sock(sock, buf, len); | |
249 | } | |
250 | ||
fac6795d DG |
251 | /* |
252 | * connect_app | |
253 | * | |
254 | * Return a socket connected to the libust communication socket | |
255 | * of the application identified by the pid. | |
256 | */ | |
257 | static int connect_app(pid_t pid) | |
258 | { | |
259 | int sock; | |
260 | ||
261 | sock = ustctl_connect_pid(pid); | |
262 | if (sock < 0) { | |
75462a81 | 263 | ERR("Fail connecting to the PID %d\n", pid); |
fac6795d DG |
264 | } |
265 | ||
266 | return sock; | |
267 | } | |
268 | ||
269 | /* | |
270 | * notify_apps | |
271 | * | |
272 | * Notify apps by writing 42 to a named pipe using name. | |
273 | * Every applications waiting for a ltt-sessiond will be notified | |
274 | * and re-register automatically to the session daemon. | |
275 | * | |
276 | * Return open or write error value. | |
277 | */ | |
278 | static int notify_apps(const char *name) | |
279 | { | |
280 | int fd; | |
281 | int ret = -1; | |
282 | ||
283 | /* Try opening the global pipe */ | |
284 | fd = open(name, O_WRONLY); | |
285 | if (fd < 0) { | |
286 | goto error; | |
287 | } | |
288 | ||
289 | /* Notify by writing on the pipe */ | |
290 | ret = write(fd, "42", 2); | |
291 | if (ret < 0) { | |
292 | perror("write"); | |
293 | } | |
294 | ||
295 | error: | |
296 | return ret; | |
297 | } | |
298 | ||
299 | /* | |
300 | * find_session | |
301 | * | |
302 | * Return a ltt_session structure ptr that matches the uuid. | |
303 | */ | |
304 | static struct ltt_session *find_session(uuid_t session_id) | |
305 | { | |
306 | struct ltt_session *iter = NULL; | |
307 | ||
308 | /* Sanity check for NULL session_id */ | |
309 | if (uuid_is_null(session_id)) { | |
310 | goto end; | |
311 | } | |
312 | ||
313 | cds_list_for_each_entry(iter, <t_session_list.head, list) { | |
314 | if (uuid_compare(iter->uuid, session_id)) { | |
315 | break; | |
316 | } | |
317 | } | |
318 | ||
319 | end: | |
320 | return iter; | |
321 | } | |
322 | ||
323 | /* | |
324 | * destroy_session | |
325 | * | |
326 | * Delete session from the global session list | |
327 | * and free the memory. | |
328 | */ | |
329 | static void destroy_session(uuid_t session_id) | |
330 | { | |
331 | struct ltt_session *iter = NULL; | |
332 | ||
333 | cds_list_for_each_entry(iter, <t_session_list.head, list) { | |
334 | if (uuid_compare(iter->uuid, session_id)) { | |
335 | cds_list_del(&iter->list); | |
336 | break; | |
337 | } | |
338 | } | |
339 | ||
340 | if (iter) { | |
341 | free(iter); | |
342 | session_count--; | |
343 | } | |
344 | } | |
345 | ||
346 | /* | |
347 | * create_session | |
348 | * | |
349 | * Create a brand new session, | |
350 | */ | |
351 | static int create_session(const char *name, uuid_t *session_id) | |
352 | { | |
353 | struct ltt_session *new_session; | |
354 | ||
355 | /* Allocate session data structure */ | |
356 | new_session = malloc(sizeof(struct ltt_session)); | |
357 | if (new_session == NULL) { | |
358 | perror("malloc"); | |
359 | goto error; | |
360 | } | |
361 | ||
362 | if (name != NULL) { | |
363 | if (asprintf(&new_session->name, "%s", name) < 0) { | |
364 | goto error; | |
365 | } | |
366 | } else { | |
367 | /* Generate session name based on the session count */ | |
368 | if (asprintf(&new_session->name, "%s%d", "auto", session_count) < 0) { | |
369 | goto error; | |
370 | } | |
371 | } | |
372 | ||
373 | /* UUID generation */ | |
374 | uuid_generate(new_session->uuid); | |
375 | uuid_copy(*session_id, new_session->uuid); | |
376 | ||
377 | /* Set consumer (identifier) to 0. This means that there is | |
378 | * NO consumer attach to that session yet. | |
379 | */ | |
380 | new_session->ust_consumer = 0; | |
381 | new_session->lttng_consumer = 0; | |
382 | ||
383 | /* Init list */ | |
384 | CDS_INIT_LIST_HEAD(&new_session->ust_traces); | |
385 | CDS_INIT_LIST_HEAD(&new_session->lttng_traces); | |
386 | ||
387 | /* Add new session to the global session list */ | |
388 | cds_list_add(&new_session->list, <t_session_list.head); | |
389 | ||
390 | session_count++; | |
391 | ||
392 | return 0; | |
393 | ||
394 | error: | |
395 | return -1; | |
396 | } | |
397 | ||
398 | /* | |
399 | * ust_list_apps | |
400 | * | |
401 | * List traceable user-space application and fill an | |
402 | * array of pids. | |
403 | * | |
404 | * Return size of the array. | |
405 | */ | |
e065084a | 406 | static size_t ust_list_apps(pid_t **pids) |
fac6795d DG |
407 | { |
408 | size_t size = 0; | |
409 | struct ltt_traceable_app *iter = NULL; | |
e065084a | 410 | pid_t *p; |
fac6795d | 411 | |
e065084a DG |
412 | if (traceable_app_count == 0) { |
413 | /* No dynamic allocation is done */ | |
414 | goto end; | |
415 | } | |
416 | ||
417 | p = malloc(sizeof(pid_t) * traceable_app_count); | |
fac6795d | 418 | |
e065084a DG |
419 | /* TODO: Mutex needed to access this list */ |
420 | cds_list_for_each_entry(iter, <t_traceable_app_list.head, list) { | |
421 | p[size] = iter->pid; | |
fac6795d DG |
422 | size++; |
423 | } | |
424 | ||
e065084a DG |
425 | *pids = p; |
426 | ||
427 | end: | |
fac6795d DG |
428 | return size; |
429 | } | |
430 | ||
e065084a DG |
431 | /* |
432 | * copy_common_data | |
433 | * | |
434 | * Copy common data between lttcomm_lttng_msg and lttcomm_session_msg | |
435 | */ | |
436 | static void copy_common_data(struct lttcomm_lttng_msg *llm, struct lttcomm_session_msg *lsm) | |
437 | { | |
438 | llm->cmd_type = lsm->cmd_type; | |
439 | llm->pid = lsm->pid; | |
440 | if (!uuid_is_null(lsm->session_id)) { | |
441 | uuid_copy(llm->session_id, lsm->session_id); | |
442 | } | |
443 | strncpy(llm->trace_name, lsm->trace_name, sizeof(llm->trace_name)); | |
444 | } | |
445 | ||
fac6795d DG |
446 | /* |
447 | * process_client_msg | |
448 | * | |
449 | * This takes the lttcomm_session_msg struct and process the command requested | |
e065084a DG |
450 | * by the client. It then creates response(s) and send it back to the |
451 | * given socket (sock). | |
fac6795d | 452 | * |
e065084a | 453 | * Return any error encountered or 0 for success. |
fac6795d | 454 | */ |
e065084a | 455 | static int process_client_msg(int sock, struct lttcomm_session_msg *lsm) |
fac6795d | 456 | { |
e065084a DG |
457 | int ret; |
458 | struct lttcomm_lttng_msg llm; | |
fac6795d DG |
459 | |
460 | /* Copy common data to identify the response | |
461 | * on the lttng client side. | |
462 | */ | |
e065084a | 463 | copy_common_data(&llm, lsm); |
fac6795d DG |
464 | |
465 | /* Default return code. | |
e065084a | 466 | * In our world, everything is OK... right? ;) |
fac6795d | 467 | */ |
e065084a | 468 | llm.ret_code = LTTCOMM_OK; |
fac6795d DG |
469 | |
470 | /* Process by command type */ | |
471 | switch (lsm->cmd_type) { | |
472 | case UST_LIST_APPS: | |
473 | { | |
e065084a DG |
474 | pid_t *pids; |
475 | llm.num_pckt = ust_list_apps(&pids); | |
476 | if (llm.num_pckt == 0) { | |
477 | ret = LTTCOMM_NO_APPS; | |
478 | goto error; | |
479 | } | |
480 | ||
481 | /* Send all packets */ | |
482 | while (llm.num_pckt != 0) { | |
483 | llm.u.list_apps.pid = pids[traceable_app_count - llm.num_pckt]; | |
484 | ret = send_unix_sock(sock, (void*) &llm, sizeof(llm)); | |
485 | if (ret < 0) { | |
486 | goto send_error; | |
487 | } | |
488 | llm.num_pckt--; | |
489 | } | |
490 | /* Allocated array by ust_list_apps() */ | |
491 | free(pids); | |
492 | ||
fac6795d DG |
493 | break; |
494 | } | |
57167058 DG |
495 | case LTTNG_LIST_SESSIONS: |
496 | { | |
497 | struct ltt_session *iter = NULL; | |
498 | ||
499 | llm.num_pckt = session_count; | |
500 | if (llm.num_pckt == 0) { | |
501 | ret = LTTCOMM_NO_SESS; | |
502 | goto error; | |
503 | } | |
504 | ||
505 | cds_list_for_each_entry(iter, <t_session_list.head, list) { | |
506 | uuid_unparse(iter->uuid, llm.u.list_sessions.uuid); | |
507 | strncpy(llm.u.list_sessions.name, iter->name, | |
508 | sizeof(llm.u.list_sessions.name)); | |
509 | ret = send_unix_sock(sock, (void*) &llm, sizeof(llm)); | |
510 | if (ret < 0) { | |
511 | goto send_error; | |
512 | } | |
513 | llm.num_pckt--; | |
514 | } | |
515 | ||
516 | break; | |
517 | } | |
fac6795d | 518 | default: |
e065084a | 519 | { |
fac6795d | 520 | /* Undefined command */ |
e065084a | 521 | ret = LTTCOMM_UND; |
fac6795d | 522 | break; |
e065084a | 523 | } |
fac6795d DG |
524 | } |
525 | ||
e065084a DG |
526 | return 0; |
527 | ||
528 | send_error: | |
529 | return ret; | |
530 | ||
531 | error: | |
532 | /* Notify client of error */ | |
533 | llm.ret_code = ret; | |
534 | send_unix_sock(sock, (void*) &llm, sizeof(llm)); | |
535 | ||
536 | return -1; | |
fac6795d DG |
537 | } |
538 | ||
539 | /* | |
540 | * usage function on stderr | |
541 | */ | |
542 | static void usage(void) | |
543 | { | |
544 | fprintf(stderr, "Usage:\n%s OPTIONS\n\nOptions:\n" | |
545 | "\t-h, --help\t\tDisplay this usage.\n" | |
546 | "\t-c, --client-sock PATH\t\tSpecify path for the client unix socket\n" | |
547 | "\t-a, --apps-sock PATH\t\tSpecify path for apps unix socket.\n" | |
548 | "\t-d, --daemonize\t\tStart as a daemon.\n" | |
549 | "\t-g, --group NAME\t\tSpecify the tracing group name. (default: tracing)\n" | |
5b8719f5 | 550 | "\t-V, --version\t\tShow version number.\n" |
75462a81 DG |
551 | "\t-S, --sig-parent\t\tSend SIGCHLD to parent pid to notify readiness.\n" |
552 | "\t-q, --quiet\t\tNo output at all.\n", | |
fac6795d DG |
553 | progname); |
554 | } | |
555 | ||
556 | /* | |
557 | * daemon argument parsing | |
558 | */ | |
559 | static int parse_args(int argc, char **argv) | |
560 | { | |
561 | int c; | |
562 | ||
563 | static struct option long_options[] = { | |
564 | { "client-sock", 1, 0, 'c' }, | |
565 | { "apps-sock", 1, 0, 'a' }, | |
566 | { "daemonize", 0, 0, 'd' }, | |
5b8719f5 | 567 | { "sig-parent", 0, 0, 'S' }, |
fac6795d DG |
568 | { "help", 0, 0, 'h' }, |
569 | { "group", 1, 0, 'g' }, | |
570 | { "version", 0, 0, 'V' }, | |
75462a81 | 571 | { "quiet", 0, 0, 'q' }, |
fac6795d DG |
572 | { NULL, 0, 0, 0 } |
573 | }; | |
574 | ||
575 | while (1) { | |
576 | int option_index = 0; | |
75462a81 | 577 | c = getopt_long(argc, argv, "dhqVS" "a:c:g:s:", long_options, &option_index); |
fac6795d DG |
578 | if (c == -1) { |
579 | break; | |
580 | } | |
581 | ||
582 | switch (c) { | |
583 | case 0: | |
584 | fprintf(stderr, "option %s", long_options[option_index].name); | |
585 | if (optarg) { | |
586 | fprintf(stderr, " with arg %s\n", optarg); | |
587 | } | |
588 | break; | |
589 | case 's': | |
590 | snprintf(client_unix_sock_path, PATH_MAX, "%s", optarg); | |
591 | break; | |
592 | case 'a': | |
593 | snprintf(apps_unix_sock_path, PATH_MAX, "%s", optarg); | |
594 | break; | |
595 | case 'd': | |
596 | opt_daemon = 1; | |
597 | break; | |
598 | case 'g': | |
599 | opt_tracing_group = strdup(optarg); | |
600 | break; | |
601 | case 'h': | |
602 | usage(); | |
603 | exit(EXIT_FAILURE); | |
604 | case 'V': | |
605 | fprintf(stdout, "%s\n", VERSION); | |
606 | exit(EXIT_SUCCESS); | |
5b8719f5 DG |
607 | case 'S': |
608 | opt_sig_parent = 1; | |
609 | break; | |
75462a81 DG |
610 | case 'q': |
611 | opt_quiet = 1; | |
612 | break; | |
fac6795d DG |
613 | default: |
614 | /* Unknown option or other error. | |
615 | * Error is printed by getopt, just return */ | |
616 | return -1; | |
617 | } | |
618 | } | |
619 | ||
620 | return 0; | |
621 | } | |
622 | ||
623 | /* | |
624 | * init_daemon_socket | |
625 | * | |
626 | * Creates the two needed socket by the daemon. | |
627 | * apps_socket - The communication socket for all UST apps. | |
628 | * client_socket - The communication of the cli tool (lttng). | |
629 | */ | |
630 | static int init_daemon_socket() | |
631 | { | |
632 | int ret = 0; | |
633 | mode_t old_umask; | |
634 | ||
635 | old_umask = umask(0); | |
636 | ||
637 | /* Create client tool unix socket */ | |
638 | client_socket = lttcomm_create_unix_sock(client_unix_sock_path); | |
639 | if (client_socket < 0) { | |
640 | ret = -1; | |
641 | goto end; | |
642 | } | |
643 | ||
644 | /* File permission MUST be 660 */ | |
645 | ret = chmod(client_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); | |
646 | if (ret < 0) { | |
647 | perror("chmod"); | |
648 | goto end; | |
649 | } | |
650 | ||
651 | /* Create the application unix socket */ | |
652 | apps_socket = lttcomm_create_unix_sock(apps_unix_sock_path); | |
653 | if (apps_socket < 0) { | |
654 | ret = -1; | |
655 | goto end; | |
656 | } | |
657 | ||
658 | /* File permission MUST be 660 */ | |
659 | ret = chmod(apps_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH); | |
660 | if (ret < 0) { | |
661 | perror("chmod"); | |
662 | goto end; | |
663 | } | |
664 | ||
665 | end: | |
666 | umask(old_umask); | |
667 | return ret; | |
668 | } | |
669 | ||
670 | /* | |
671 | * check_existing_daemon | |
672 | * | |
673 | * Check if the global socket is available. | |
674 | * If yes, error is returned. | |
675 | */ | |
676 | static int check_existing_daemon() | |
677 | { | |
678 | int ret; | |
679 | ||
680 | ret = access(client_unix_sock_path, F_OK); | |
681 | if (ret == 0) { | |
682 | ret = access(apps_unix_sock_path, F_OK); | |
683 | } | |
684 | ||
685 | return ret; | |
686 | } | |
687 | ||
688 | /* | |
689 | * get_home_dir | |
690 | * | |
691 | * Return pointer to home directory path using | |
692 | * the env variable HOME. | |
693 | * | |
694 | * Default : /tmp | |
695 | */ | |
696 | static const char *get_home_dir(void) | |
697 | { | |
698 | const char *home_path; | |
699 | ||
686204ab | 700 | if ((home_path = (const char *) getenv("HOME")) == NULL) { |
fac6795d DG |
701 | home_path = default_home_dir; |
702 | } | |
703 | ||
704 | return home_path; | |
705 | } | |
706 | ||
707 | /* | |
708 | * set_socket_perms | |
709 | * | |
710 | * Set the tracing group gid onto the client socket. | |
711 | */ | |
712 | static int set_socket_perms(void) | |
713 | { | |
714 | int ret; | |
715 | struct group *grp; | |
716 | ||
717 | /* Decide which group name to use */ | |
718 | (opt_tracing_group != NULL) ? | |
719 | (grp = getgrnam(opt_tracing_group)) : | |
720 | (grp = getgrnam(default_tracing_group)); | |
721 | ||
722 | if (grp == NULL) { | |
75462a81 | 723 | ERR("Missing tracing group. Aborting execution.\n"); |
fac6795d DG |
724 | ret = -1; |
725 | goto end; | |
726 | } | |
727 | ||
728 | ret = chown(client_unix_sock_path, 0, grp->gr_gid); | |
729 | if (ret < 0) { | |
730 | perror("chown"); | |
731 | } | |
732 | ||
733 | end: | |
734 | return ret; | |
735 | } | |
736 | ||
fac6795d DG |
737 | /* |
738 | * set_signal_handler | |
739 | * | |
740 | * Setup signal handler for : | |
741 | * SIGINT, SIGTERM, SIGPIPE | |
742 | */ | |
743 | static int set_signal_handler(void) | |
744 | { | |
745 | int ret = 0; | |
746 | struct sigaction sa; | |
747 | sigset_t sigset; | |
748 | ||
749 | if ((ret = sigemptyset(&sigset)) < 0) { | |
750 | perror("sigemptyset"); | |
751 | return ret; | |
752 | } | |
753 | ||
754 | sa.sa_handler = sighandler; | |
755 | sa.sa_mask = sigset; | |
756 | sa.sa_flags = 0; | |
757 | if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) { | |
758 | perror("sigaction"); | |
759 | return ret; | |
760 | } | |
761 | ||
762 | if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) { | |
763 | perror("sigaction"); | |
764 | return ret; | |
765 | } | |
766 | ||
767 | if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) { | |
768 | perror("sigaction"); | |
769 | return ret; | |
770 | } | |
771 | ||
772 | return ret; | |
773 | } | |
774 | ||
775 | /** | |
776 | * sighandler | |
777 | * | |
778 | * Signal handler for the daemon | |
779 | */ | |
780 | static void sighandler(int sig) | |
781 | { | |
782 | switch (sig) { | |
783 | case SIGPIPE: | |
784 | case SIGINT: | |
785 | case SIGTERM: | |
786 | cleanup(); | |
686204ab | 787 | break; |
fac6795d DG |
788 | default: |
789 | break; | |
790 | } | |
791 | ||
792 | exit(EXIT_SUCCESS); | |
793 | } | |
794 | ||
795 | /* | |
796 | * cleanup | |
797 | * | |
798 | * Cleanup the daemon on exit | |
799 | */ | |
800 | static void cleanup() | |
801 | { | |
802 | /* <fun> */ | |
75462a81 DG |
803 | MSG("\n\n%c[%d;%dm*** assert failed *** ==> %c[%dm", 27,1,31,27,0); |
804 | MSG("%c[%d;%dm Matthew, BEET driven development works!%c[%dm\n",27,1,33,27,0); | |
fac6795d DG |
805 | /* </fun> */ |
806 | ||
807 | unlink(client_unix_sock_path); | |
808 | unlink(apps_unix_sock_path); | |
809 | } | |
810 | ||
811 | /* | |
812 | * main | |
813 | */ | |
814 | int main(int argc, char **argv) | |
815 | { | |
816 | int i; | |
817 | int ret = 0; | |
818 | void *status; | |
819 | pthread_t threads[2]; | |
820 | ||
821 | /* Parse arguments */ | |
822 | progname = argv[0]; | |
823 | if ((ret = parse_args(argc, argv) < 0)) { | |
824 | goto error; | |
825 | } | |
826 | ||
827 | /* Daemonize */ | |
828 | if (opt_daemon) { | |
53094c05 DG |
829 | ret = daemon(0, 0); |
830 | if (ret < 0) { | |
831 | perror("daemon"); | |
832 | goto error; | |
833 | } | |
fac6795d DG |
834 | } |
835 | ||
836 | /* Check if daemon is UID = 0 */ | |
837 | is_root = !getuid(); | |
838 | ||
839 | /* Set all sockets path */ | |
840 | if (is_root) { | |
841 | if (strlen(apps_unix_sock_path) == 0) { | |
842 | (snprintf(apps_unix_sock_path, PATH_MAX, | |
843 | DEFAULT_GLOBAL_APPS_UNIX_SOCK)); | |
844 | } | |
845 | ||
846 | if (strlen(client_unix_sock_path) == 0) { | |
847 | (snprintf(client_unix_sock_path, PATH_MAX, | |
848 | DEFAULT_GLOBAL_CLIENT_UNIX_SOCK)); | |
849 | } | |
850 | } else { | |
851 | if (strlen(apps_unix_sock_path) == 0) { | |
852 | (snprintf(apps_unix_sock_path, PATH_MAX, | |
853 | DEFAULT_HOME_APPS_UNIX_SOCK, get_home_dir())); | |
854 | } | |
855 | ||
856 | /* Set the cli tool unix socket path */ | |
857 | if (strlen(client_unix_sock_path) == 0) { | |
858 | (snprintf(client_unix_sock_path, PATH_MAX, | |
859 | DEFAULT_HOME_CLIENT_UNIX_SOCK, get_home_dir())); | |
860 | } | |
861 | } | |
862 | ||
863 | /* See if daemon already exist. If any of the two | |
864 | * socket needed by the daemon are present, this test fails | |
865 | */ | |
866 | if ((ret = check_existing_daemon()) == 0) { | |
75462a81 | 867 | ERR("Already running daemon.\n"); |
fac6795d DG |
868 | goto error; |
869 | } | |
870 | ||
871 | if (set_signal_handler() < 0) { | |
872 | goto error; | |
873 | } | |
874 | ||
875 | /* Setup the two needed unix socket */ | |
876 | if (init_daemon_socket() < 0) { | |
877 | goto error; | |
878 | } | |
879 | ||
880 | /* Set credentials to socket */ | |
881 | if (is_root && (set_socket_perms() < 0)) { | |
882 | goto error; | |
883 | } | |
884 | ||
5b8719f5 DG |
885 | /* Get parent pid if -S, --sig-parent is specified. */ |
886 | if (opt_sig_parent) { | |
887 | ppid = getppid(); | |
888 | } | |
889 | ||
fac6795d DG |
890 | while (1) { |
891 | /* Create thread to manage the client socket */ | |
892 | ret = pthread_create(&threads[0], NULL, thread_manage_clients, (void *) NULL); | |
893 | if (ret != 0) { | |
894 | perror("pthread_create"); | |
895 | goto error; | |
896 | } | |
897 | ||
898 | /* Create thread to manage application socket */ | |
899 | ret = pthread_create(&threads[1], NULL, thread_manage_apps, (void *) NULL); | |
900 | if (ret != 0) { | |
901 | perror("pthread_create"); | |
902 | goto error; | |
903 | } | |
904 | ||
905 | for (i = 0; i < 2; i++) { | |
906 | ret = pthread_join(threads[i], &status); | |
907 | if (ret != 0) { | |
908 | perror("pthread_join"); | |
909 | goto error; | |
910 | } | |
911 | } | |
912 | } | |
913 | ||
914 | cleanup(); | |
915 | return 0; | |
916 | ||
917 | error: | |
918 | cleanup(); | |
919 | ||
920 | return EXIT_FAILURE; | |
921 | } |