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" | |
41 | ||
686204ab MD |
42 | const char default_home_dir[] = DEFAULT_HOME_DIR; |
43 | const char default_tracing_group[] = DEFAULT_TRACING_GROUP; | |
44 | const char default_ust_sock_dir[] = DEFAULT_UST_SOCK_DIR; | |
45 | const char default_global_apps_pipe[] = DEFAULT_GLOBAL_APPS_PIPE; | |
46 | ||
fac6795d DG |
47 | /* Static functions */ |
48 | static int set_signal_handler(void); | |
49 | static int set_socket_perms(void); | |
50 | static void sighandler(int); | |
fac6795d | 51 | static void cleanup(void); |
e065084a | 52 | static void copy_common_data(struct lttcomm_lttng_msg *llm, struct lttcomm_session_msg *lsm); |
fac6795d DG |
53 | static int check_existing_daemon(void); |
54 | static int notify_apps(const char*); | |
55 | static int connect_app(pid_t); | |
56 | static int init_daemon_socket(void); | |
e065084a DG |
57 | static int process_client_msg(int sock, struct lttcomm_session_msg*); |
58 | static int send_unix_sock(int sock, void *buf, size_t len); | |
fac6795d DG |
59 | |
60 | static void *thread_manage_clients(void *); | |
61 | static void *thread_manage_apps(void *); | |
62 | ||
63 | static int create_session(const char*, uuid_t *); | |
64 | static void destroy_session(uuid_t); | |
65 | ||
66 | static struct ltt_session *find_session(uuid_t); | |
67 | ||
68 | /* Variables */ | |
69 | const char *progname; | |
70 | const char *opt_tracing_group; | |
5b8719f5 | 71 | static int opt_sig_parent; |
fac6795d DG |
72 | static int opt_daemon; |
73 | static int is_root; /* Set to 1 if the daemon is running as root */ | |
5b8719f5 | 74 | static pid_t ppid; |
fac6795d DG |
75 | |
76 | static char apps_unix_sock_path[PATH_MAX]; /* Global application Unix socket path */ | |
77 | static char client_unix_sock_path[PATH_MAX]; /* Global client Unix socket path */ | |
78 | ||
79 | static int client_socket; | |
80 | static int apps_socket; | |
81 | ||
82 | static struct ltt_session *current_session; | |
e065084a DG |
83 | |
84 | /* Number of element for the list below. */ | |
85 | static unsigned int session_count; | |
86 | static unsigned int traceable_app_count; | |
fac6795d DG |
87 | |
88 | /* Init session's list */ | |
89 | static struct ltt_session_list ltt_session_list = { | |
90 | .head = CDS_LIST_HEAD_INIT(ltt_session_list.head), | |
91 | }; | |
92 | ||
e065084a | 93 | /* Init ust traceabl application's list */ |
fac6795d DG |
94 | static struct ltt_traceable_app_list ltt_traceable_app_list = { |
95 | .head = CDS_LIST_HEAD_INIT(ltt_traceable_app_list.head), | |
96 | }; | |
97 | ||
98 | /* | |
99 | * thread_manage_apps | |
100 | * | |
101 | * This thread manage the application socket communication | |
102 | */ | |
103 | static void *thread_manage_apps(void *data) | |
104 | { | |
105 | int sock, ret; | |
106 | struct ltt_traceable_app *lta; | |
107 | ||
108 | /* TODO: Something more elegant is needed but fine for now */ | |
686204ab | 109 | struct { |
fac6795d | 110 | int reg; /* 1:register, 0:unregister */ |
686204ab MD |
111 | pid_t pid; |
112 | uid_t uid; | |
113 | } reg_msg; | |
fac6795d DG |
114 | |
115 | /* Notify all applications to register */ | |
116 | notify_apps(default_global_apps_pipe); | |
117 | ||
118 | ret = lttcomm_listen_unix_sock(apps_socket); | |
119 | if (ret < 0) { | |
120 | goto error; | |
121 | } | |
122 | ||
123 | while (1) { | |
124 | /* Blocking call, waiting for transmission */ | |
125 | sock = lttcomm_accept_unix_sock(apps_socket); | |
126 | if (sock < 0) { | |
127 | goto error; | |
128 | } | |
129 | ||
130 | /* Basic recv here to handle the very simple data | |
131 | * that the libust send to register (reg_msg). | |
132 | */ | |
133 | ret = recv(sock, ®_msg, sizeof(reg_msg), 0); | |
134 | if (ret < 0) { | |
135 | perror("recv"); | |
136 | continue; | |
137 | } | |
138 | ||
139 | /* Add application to the global traceable list */ | |
140 | if (reg_msg.reg == 1) { | |
141 | /* Registering */ | |
142 | lta = malloc(sizeof(struct ltt_traceable_app)); | |
143 | lta->pid = reg_msg.pid; | |
144 | lta->uid = reg_msg.uid; | |
145 | cds_list_add(<a->list, <t_traceable_app_list.head); | |
e065084a | 146 | traceable_app_count++; |
fac6795d DG |
147 | } else { |
148 | /* Unregistering */ | |
149 | lta = NULL; | |
150 | cds_list_for_each_entry(lta, <t_traceable_app_list.head, list) { | |
151 | if (lta->pid == reg_msg.pid && lta->uid == reg_msg.uid) { | |
152 | cds_list_del(<a->list); | |
e065084a DG |
153 | /* Check to not overflow here */ |
154 | if (traceable_app_count != 0) { | |
155 | traceable_app_count--; | |
156 | } | |
fac6795d DG |
157 | break; |
158 | } | |
159 | } | |
160 | ||
161 | /* If an item was found, free it from memory */ | |
162 | if (lta) { | |
163 | free(lta); | |
164 | } | |
165 | } | |
166 | } | |
167 | ||
168 | error: | |
169 | ||
170 | return NULL; | |
171 | } | |
172 | ||
173 | /* | |
174 | * thread_manage_clients | |
175 | * | |
176 | * This thread manage all clients request using the unix | |
177 | * client socket for communication. | |
178 | */ | |
179 | static void *thread_manage_clients(void *data) | |
180 | { | |
181 | int sock, ret; | |
182 | struct lttcomm_session_msg lsm; | |
fac6795d DG |
183 | |
184 | ret = lttcomm_listen_unix_sock(client_socket); | |
185 | if (ret < 0) { | |
186 | goto error; | |
187 | } | |
188 | ||
5b8719f5 DG |
189 | /* Notify parent pid that we are ready |
190 | * to accept command for client side. | |
191 | */ | |
192 | if (opt_sig_parent) { | |
193 | kill(ppid, SIGCHLD); | |
194 | } | |
195 | ||
fac6795d DG |
196 | while (1) { |
197 | /* Blocking call, waiting for transmission */ | |
198 | sock = lttcomm_accept_unix_sock(client_socket); | |
199 | if (sock < 0) { | |
200 | goto error; | |
201 | } | |
202 | ||
203 | /* | |
204 | * Data is received from the lttng client. The struct | |
205 | * lttcomm_session_msg (lsm) contains the command and data | |
206 | * request of the client. | |
207 | */ | |
208 | ret = lttcomm_recv_unix_sock(sock, &lsm, sizeof(lsm)); | |
209 | if (ret < 0) { | |
210 | continue; | |
211 | } | |
212 | ||
213 | /* This function dispatch the work to the LTTng or UST libs | |
e065084a DG |
214 | * and then sends back the response to the client. This is needed |
215 | * because there might be more then one lttcomm_lttng_msg to | |
216 | * send out so process_client_msg do both jobs. | |
fac6795d | 217 | */ |
e065084a DG |
218 | ret = process_client_msg(sock, &lsm); |
219 | if (ret < 0) { | |
220 | /* Error detected but still accept command */ | |
221 | continue; | |
fac6795d DG |
222 | } |
223 | } | |
224 | ||
225 | error: | |
226 | return NULL; | |
227 | } | |
228 | ||
e065084a DG |
229 | /* |
230 | * send_unix_sock | |
231 | * | |
232 | * Send data on a unix socket using the liblttsessiondcomm API. | |
233 | * | |
234 | * Return lttcomm error code. | |
235 | */ | |
236 | static int send_unix_sock(int sock, void *buf, size_t len) | |
237 | { | |
238 | /* Check valid length */ | |
239 | if (len <= 0) { | |
240 | return -1; | |
241 | } | |
242 | ||
243 | return lttcomm_send_unix_sock(sock, buf, len); | |
244 | } | |
245 | ||
fac6795d DG |
246 | /* |
247 | * connect_app | |
248 | * | |
249 | * Return a socket connected to the libust communication socket | |
250 | * of the application identified by the pid. | |
251 | */ | |
252 | static int connect_app(pid_t pid) | |
253 | { | |
254 | int sock; | |
255 | ||
256 | sock = ustctl_connect_pid(pid); | |
257 | if (sock < 0) { | |
258 | fprintf(stderr, "Fail connecting to the PID %d\n", pid); | |
259 | } | |
260 | ||
261 | return sock; | |
262 | } | |
263 | ||
264 | /* | |
265 | * notify_apps | |
266 | * | |
267 | * Notify apps by writing 42 to a named pipe using name. | |
268 | * Every applications waiting for a ltt-sessiond will be notified | |
269 | * and re-register automatically to the session daemon. | |
270 | * | |
271 | * Return open or write error value. | |
272 | */ | |
273 | static int notify_apps(const char *name) | |
274 | { | |
275 | int fd; | |
276 | int ret = -1; | |
277 | ||
278 | /* Try opening the global pipe */ | |
279 | fd = open(name, O_WRONLY); | |
280 | if (fd < 0) { | |
281 | goto error; | |
282 | } | |
283 | ||
284 | /* Notify by writing on the pipe */ | |
285 | ret = write(fd, "42", 2); | |
286 | if (ret < 0) { | |
287 | perror("write"); | |
288 | } | |
289 | ||
290 | error: | |
291 | return ret; | |
292 | } | |
293 | ||
294 | /* | |
295 | * find_session | |
296 | * | |
297 | * Return a ltt_session structure ptr that matches the uuid. | |
298 | */ | |
299 | static struct ltt_session *find_session(uuid_t session_id) | |
300 | { | |
301 | struct ltt_session *iter = NULL; | |
302 | ||
303 | /* Sanity check for NULL session_id */ | |
304 | if (uuid_is_null(session_id)) { | |
305 | goto end; | |
306 | } | |
307 | ||
308 | cds_list_for_each_entry(iter, <t_session_list.head, list) { | |
309 | if (uuid_compare(iter->uuid, session_id)) { | |
310 | break; | |
311 | } | |
312 | } | |
313 | ||
314 | end: | |
315 | return iter; | |
316 | } | |
317 | ||
318 | /* | |
319 | * destroy_session | |
320 | * | |
321 | * Delete session from the global session list | |
322 | * and free the memory. | |
323 | */ | |
324 | static void destroy_session(uuid_t session_id) | |
325 | { | |
326 | struct ltt_session *iter = NULL; | |
327 | ||
328 | cds_list_for_each_entry(iter, <t_session_list.head, list) { | |
329 | if (uuid_compare(iter->uuid, session_id)) { | |
330 | cds_list_del(&iter->list); | |
331 | break; | |
332 | } | |
333 | } | |
334 | ||
335 | if (iter) { | |
336 | free(iter); | |
337 | session_count--; | |
338 | } | |
339 | } | |
340 | ||
341 | /* | |
342 | * create_session | |
343 | * | |
344 | * Create a brand new session, | |
345 | */ | |
346 | static int create_session(const char *name, uuid_t *session_id) | |
347 | { | |
348 | struct ltt_session *new_session; | |
349 | ||
350 | /* Allocate session data structure */ | |
351 | new_session = malloc(sizeof(struct ltt_session)); | |
352 | if (new_session == NULL) { | |
353 | perror("malloc"); | |
354 | goto error; | |
355 | } | |
356 | ||
357 | if (name != NULL) { | |
358 | if (asprintf(&new_session->name, "%s", name) < 0) { | |
359 | goto error; | |
360 | } | |
361 | } else { | |
362 | /* Generate session name based on the session count */ | |
363 | if (asprintf(&new_session->name, "%s%d", "auto", session_count) < 0) { | |
364 | goto error; | |
365 | } | |
366 | } | |
367 | ||
368 | /* UUID generation */ | |
369 | uuid_generate(new_session->uuid); | |
370 | uuid_copy(*session_id, new_session->uuid); | |
371 | ||
372 | /* Set consumer (identifier) to 0. This means that there is | |
373 | * NO consumer attach to that session yet. | |
374 | */ | |
375 | new_session->ust_consumer = 0; | |
376 | new_session->lttng_consumer = 0; | |
377 | ||
378 | /* Init list */ | |
379 | CDS_INIT_LIST_HEAD(&new_session->ust_traces); | |
380 | CDS_INIT_LIST_HEAD(&new_session->lttng_traces); | |
381 | ||
382 | /* Add new session to the global session list */ | |
383 | cds_list_add(&new_session->list, <t_session_list.head); | |
384 | ||
385 | session_count++; | |
386 | ||
387 | return 0; | |
388 | ||
389 | error: | |
390 | return -1; | |
391 | } | |
392 | ||
393 | /* | |
394 | * ust_list_apps | |
395 | * | |
396 | * List traceable user-space application and fill an | |
397 | * array of pids. | |
398 | * | |
399 | * Return size of the array. | |
400 | */ | |
e065084a | 401 | static size_t ust_list_apps(pid_t **pids) |
fac6795d DG |
402 | { |
403 | size_t size = 0; | |
404 | struct ltt_traceable_app *iter = NULL; | |
e065084a | 405 | pid_t *p; |
fac6795d | 406 | |
e065084a DG |
407 | if (traceable_app_count == 0) { |
408 | /* No dynamic allocation is done */ | |
409 | goto end; | |
410 | } | |
411 | ||
412 | p = malloc(sizeof(pid_t) * traceable_app_count); | |
fac6795d | 413 | |
e065084a DG |
414 | /* TODO: Mutex needed to access this list */ |
415 | cds_list_for_each_entry(iter, <t_traceable_app_list.head, list) { | |
416 | p[size] = iter->pid; | |
fac6795d DG |
417 | size++; |
418 | } | |
419 | ||
e065084a DG |
420 | *pids = p; |
421 | ||
422 | end: | |
fac6795d DG |
423 | return size; |
424 | } | |
425 | ||
e065084a DG |
426 | /* |
427 | * copy_common_data | |
428 | * | |
429 | * Copy common data between lttcomm_lttng_msg and lttcomm_session_msg | |
430 | */ | |
431 | static void copy_common_data(struct lttcomm_lttng_msg *llm, struct lttcomm_session_msg *lsm) | |
432 | { | |
433 | llm->cmd_type = lsm->cmd_type; | |
434 | llm->pid = lsm->pid; | |
435 | if (!uuid_is_null(lsm->session_id)) { | |
436 | uuid_copy(llm->session_id, lsm->session_id); | |
437 | } | |
438 | strncpy(llm->trace_name, lsm->trace_name, sizeof(llm->trace_name)); | |
439 | } | |
440 | ||
fac6795d DG |
441 | /* |
442 | * process_client_msg | |
443 | * | |
444 | * This takes the lttcomm_session_msg struct and process the command requested | |
e065084a DG |
445 | * by the client. It then creates response(s) and send it back to the |
446 | * given socket (sock). | |
fac6795d | 447 | * |
e065084a | 448 | * Return any error encountered or 0 for success. |
fac6795d | 449 | */ |
e065084a | 450 | static int process_client_msg(int sock, struct lttcomm_session_msg *lsm) |
fac6795d | 451 | { |
e065084a DG |
452 | int ret; |
453 | struct lttcomm_lttng_msg llm; | |
fac6795d DG |
454 | |
455 | /* Copy common data to identify the response | |
456 | * on the lttng client side. | |
457 | */ | |
e065084a | 458 | copy_common_data(&llm, lsm); |
fac6795d DG |
459 | |
460 | /* Default return code. | |
e065084a | 461 | * In our world, everything is OK... right? ;) |
fac6795d | 462 | */ |
e065084a | 463 | llm.ret_code = LTTCOMM_OK; |
fac6795d DG |
464 | |
465 | /* Process by command type */ | |
466 | switch (lsm->cmd_type) { | |
467 | case UST_LIST_APPS: | |
468 | { | |
e065084a DG |
469 | pid_t *pids; |
470 | llm.num_pckt = ust_list_apps(&pids); | |
471 | if (llm.num_pckt == 0) { | |
472 | ret = LTTCOMM_NO_APPS; | |
473 | goto error; | |
474 | } | |
475 | ||
476 | /* Send all packets */ | |
477 | while (llm.num_pckt != 0) { | |
478 | llm.u.list_apps.pid = pids[traceable_app_count - llm.num_pckt]; | |
479 | ret = send_unix_sock(sock, (void*) &llm, sizeof(llm)); | |
480 | if (ret < 0) { | |
481 | goto send_error; | |
482 | } | |
483 | llm.num_pckt--; | |
484 | } | |
485 | /* Allocated array by ust_list_apps() */ | |
486 | free(pids); | |
487 | ||
fac6795d DG |
488 | break; |
489 | } | |
490 | default: | |
e065084a | 491 | { |
fac6795d | 492 | /* Undefined command */ |
e065084a | 493 | ret = LTTCOMM_UND; |
fac6795d | 494 | break; |
e065084a | 495 | } |
fac6795d DG |
496 | } |
497 | ||
e065084a DG |
498 | return 0; |
499 | ||
500 | send_error: | |
501 | return ret; | |
502 | ||
503 | error: | |
504 | /* Notify client of error */ | |
505 | llm.ret_code = ret; | |
506 | send_unix_sock(sock, (void*) &llm, sizeof(llm)); | |
507 | ||
508 | return -1; | |
fac6795d DG |
509 | } |
510 | ||
511 | /* | |
512 | * usage function on stderr | |
513 | */ | |
514 | static void usage(void) | |
515 | { | |
516 | fprintf(stderr, "Usage:\n%s OPTIONS\n\nOptions:\n" | |
517 | "\t-h, --help\t\tDisplay this usage.\n" | |
518 | "\t-c, --client-sock PATH\t\tSpecify path for the client unix socket\n" | |
519 | "\t-a, --apps-sock PATH\t\tSpecify path for apps unix socket.\n" | |
520 | "\t-d, --daemonize\t\tStart as a daemon.\n" | |
521 | "\t-g, --group NAME\t\tSpecify the tracing group name. (default: tracing)\n" | |
5b8719f5 DG |
522 | "\t-V, --version\t\tShow version number.\n" |
523 | "\t-S, --sig-parent\t\tSend SIGCHLD to parent pid to notify readiness.\n", | |
fac6795d DG |
524 | progname); |
525 | } | |
526 | ||
527 | /* | |
528 | * daemon argument parsing | |
529 | */ | |
530 | static int parse_args(int argc, char **argv) | |
531 | { | |
532 | int c; | |
533 | ||
534 | static struct option long_options[] = { | |
535 | { "client-sock", 1, 0, 'c' }, | |
536 | { "apps-sock", 1, 0, 'a' }, | |
537 | { "daemonize", 0, 0, 'd' }, | |
5b8719f5 | 538 | { "sig-parent", 0, 0, 'S' }, |
fac6795d DG |
539 | { "help", 0, 0, 'h' }, |
540 | { "group", 1, 0, 'g' }, | |
541 | { "version", 0, 0, 'V' }, | |
542 | { NULL, 0, 0, 0 } | |
543 | }; | |
544 | ||
545 | while (1) { | |
546 | int option_index = 0; | |
5b8719f5 | 547 | c = getopt_long(argc, argv, "dhVS" "a:c:g:s:", long_options, &option_index); |
fac6795d DG |
548 | if (c == -1) { |
549 | break; | |
550 | } | |
551 | ||
552 | switch (c) { | |
553 | case 0: | |
554 | fprintf(stderr, "option %s", long_options[option_index].name); | |
555 | if (optarg) { | |
556 | fprintf(stderr, " with arg %s\n", optarg); | |
557 | } | |
558 | break; | |
559 | case 's': | |
560 | snprintf(client_unix_sock_path, PATH_MAX, "%s", optarg); | |
561 | break; | |
562 | case 'a': | |
563 | snprintf(apps_unix_sock_path, PATH_MAX, "%s", optarg); | |
564 | break; | |
565 | case 'd': | |
566 | opt_daemon = 1; | |
567 | break; | |
568 | case 'g': | |
569 | opt_tracing_group = strdup(optarg); | |
570 | break; | |
571 | case 'h': | |
572 | usage(); | |
573 | exit(EXIT_FAILURE); | |
574 | case 'V': | |
575 | fprintf(stdout, "%s\n", VERSION); | |
576 | exit(EXIT_SUCCESS); | |
5b8719f5 DG |
577 | case 'S': |
578 | opt_sig_parent = 1; | |
579 | break; | |
fac6795d DG |
580 | default: |
581 | /* Unknown option or other error. | |
582 | * Error is printed by getopt, just return */ | |
583 | return -1; | |
584 | } | |
585 | } | |
586 | ||
587 | return 0; | |
588 | } | |
589 | ||
590 | /* | |
591 | * init_daemon_socket | |
592 | * | |
593 | * Creates the two needed socket by the daemon. | |
594 | * apps_socket - The communication socket for all UST apps. | |
595 | * client_socket - The communication of the cli tool (lttng). | |
596 | */ | |
597 | static int init_daemon_socket() | |
598 | { | |
599 | int ret = 0; | |
600 | mode_t old_umask; | |
601 | ||
602 | old_umask = umask(0); | |
603 | ||
604 | /* Create client tool unix socket */ | |
605 | client_socket = lttcomm_create_unix_sock(client_unix_sock_path); | |
606 | if (client_socket < 0) { | |
607 | ret = -1; | |
608 | goto end; | |
609 | } | |
610 | ||
611 | /* File permission MUST be 660 */ | |
612 | ret = chmod(client_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); | |
613 | if (ret < 0) { | |
614 | perror("chmod"); | |
615 | goto end; | |
616 | } | |
617 | ||
618 | /* Create the application unix socket */ | |
619 | apps_socket = lttcomm_create_unix_sock(apps_unix_sock_path); | |
620 | if (apps_socket < 0) { | |
621 | ret = -1; | |
622 | goto end; | |
623 | } | |
624 | ||
625 | /* File permission MUST be 660 */ | |
626 | ret = chmod(apps_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH); | |
627 | if (ret < 0) { | |
628 | perror("chmod"); | |
629 | goto end; | |
630 | } | |
631 | ||
632 | end: | |
633 | umask(old_umask); | |
634 | return ret; | |
635 | } | |
636 | ||
637 | /* | |
638 | * check_existing_daemon | |
639 | * | |
640 | * Check if the global socket is available. | |
641 | * If yes, error is returned. | |
642 | */ | |
643 | static int check_existing_daemon() | |
644 | { | |
645 | int ret; | |
646 | ||
647 | ret = access(client_unix_sock_path, F_OK); | |
648 | if (ret == 0) { | |
649 | ret = access(apps_unix_sock_path, F_OK); | |
650 | } | |
651 | ||
652 | return ret; | |
653 | } | |
654 | ||
655 | /* | |
656 | * get_home_dir | |
657 | * | |
658 | * Return pointer to home directory path using | |
659 | * the env variable HOME. | |
660 | * | |
661 | * Default : /tmp | |
662 | */ | |
663 | static const char *get_home_dir(void) | |
664 | { | |
665 | const char *home_path; | |
666 | ||
686204ab | 667 | if ((home_path = (const char *) getenv("HOME")) == NULL) { |
fac6795d DG |
668 | home_path = default_home_dir; |
669 | } | |
670 | ||
671 | return home_path; | |
672 | } | |
673 | ||
674 | /* | |
675 | * set_socket_perms | |
676 | * | |
677 | * Set the tracing group gid onto the client socket. | |
678 | */ | |
679 | static int set_socket_perms(void) | |
680 | { | |
681 | int ret; | |
682 | struct group *grp; | |
683 | ||
684 | /* Decide which group name to use */ | |
685 | (opt_tracing_group != NULL) ? | |
686 | (grp = getgrnam(opt_tracing_group)) : | |
687 | (grp = getgrnam(default_tracing_group)); | |
688 | ||
689 | if (grp == NULL) { | |
690 | fprintf(stderr, "Missing tracing group. Aborting execution.\n"); | |
691 | ret = -1; | |
692 | goto end; | |
693 | } | |
694 | ||
695 | ret = chown(client_unix_sock_path, 0, grp->gr_gid); | |
696 | if (ret < 0) { | |
697 | perror("chown"); | |
698 | } | |
699 | ||
700 | end: | |
701 | return ret; | |
702 | } | |
703 | ||
fac6795d DG |
704 | /* |
705 | * set_signal_handler | |
706 | * | |
707 | * Setup signal handler for : | |
708 | * SIGINT, SIGTERM, SIGPIPE | |
709 | */ | |
710 | static int set_signal_handler(void) | |
711 | { | |
712 | int ret = 0; | |
713 | struct sigaction sa; | |
714 | sigset_t sigset; | |
715 | ||
716 | if ((ret = sigemptyset(&sigset)) < 0) { | |
717 | perror("sigemptyset"); | |
718 | return ret; | |
719 | } | |
720 | ||
721 | sa.sa_handler = sighandler; | |
722 | sa.sa_mask = sigset; | |
723 | sa.sa_flags = 0; | |
724 | if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) { | |
725 | perror("sigaction"); | |
726 | return ret; | |
727 | } | |
728 | ||
729 | if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) { | |
730 | perror("sigaction"); | |
731 | return ret; | |
732 | } | |
733 | ||
734 | if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) { | |
735 | perror("sigaction"); | |
736 | return ret; | |
737 | } | |
738 | ||
739 | return ret; | |
740 | } | |
741 | ||
742 | /** | |
743 | * sighandler | |
744 | * | |
745 | * Signal handler for the daemon | |
746 | */ | |
747 | static void sighandler(int sig) | |
748 | { | |
749 | switch (sig) { | |
750 | case SIGPIPE: | |
751 | case SIGINT: | |
752 | case SIGTERM: | |
753 | cleanup(); | |
686204ab | 754 | break; |
fac6795d DG |
755 | default: |
756 | break; | |
757 | } | |
758 | ||
759 | exit(EXIT_SUCCESS); | |
760 | } | |
761 | ||
762 | /* | |
763 | * cleanup | |
764 | * | |
765 | * Cleanup the daemon on exit | |
766 | */ | |
767 | static void cleanup() | |
768 | { | |
769 | /* <fun> */ | |
770 | fprintf(stdout, "\n\n%c[%d;%dm*** assert failed *** ==> %c[%dm", 27,1,31,27,0); | |
771 | fprintf(stdout, "%c[%d;%dm Matthew, BEET driven development works!%c[%dm\n",27,1,33,27,0); | |
772 | /* </fun> */ | |
773 | ||
774 | unlink(client_unix_sock_path); | |
775 | unlink(apps_unix_sock_path); | |
776 | } | |
777 | ||
778 | /* | |
779 | * main | |
780 | */ | |
781 | int main(int argc, char **argv) | |
782 | { | |
783 | int i; | |
784 | int ret = 0; | |
785 | void *status; | |
786 | pthread_t threads[2]; | |
787 | ||
788 | /* Parse arguments */ | |
789 | progname = argv[0]; | |
790 | if ((ret = parse_args(argc, argv) < 0)) { | |
791 | goto error; | |
792 | } | |
793 | ||
794 | /* Daemonize */ | |
795 | if (opt_daemon) { | |
53094c05 DG |
796 | ret = daemon(0, 0); |
797 | if (ret < 0) { | |
798 | perror("daemon"); | |
799 | goto error; | |
800 | } | |
fac6795d DG |
801 | } |
802 | ||
803 | /* Check if daemon is UID = 0 */ | |
804 | is_root = !getuid(); | |
805 | ||
806 | /* Set all sockets path */ | |
807 | if (is_root) { | |
808 | if (strlen(apps_unix_sock_path) == 0) { | |
809 | (snprintf(apps_unix_sock_path, PATH_MAX, | |
810 | DEFAULT_GLOBAL_APPS_UNIX_SOCK)); | |
811 | } | |
812 | ||
813 | if (strlen(client_unix_sock_path) == 0) { | |
814 | (snprintf(client_unix_sock_path, PATH_MAX, | |
815 | DEFAULT_GLOBAL_CLIENT_UNIX_SOCK)); | |
816 | } | |
817 | } else { | |
818 | if (strlen(apps_unix_sock_path) == 0) { | |
819 | (snprintf(apps_unix_sock_path, PATH_MAX, | |
820 | DEFAULT_HOME_APPS_UNIX_SOCK, get_home_dir())); | |
821 | } | |
822 | ||
823 | /* Set the cli tool unix socket path */ | |
824 | if (strlen(client_unix_sock_path) == 0) { | |
825 | (snprintf(client_unix_sock_path, PATH_MAX, | |
826 | DEFAULT_HOME_CLIENT_UNIX_SOCK, get_home_dir())); | |
827 | } | |
828 | } | |
829 | ||
830 | /* See if daemon already exist. If any of the two | |
831 | * socket needed by the daemon are present, this test fails | |
832 | */ | |
833 | if ((ret = check_existing_daemon()) == 0) { | |
834 | fprintf(stderr, "Already running daemon.\n"); | |
835 | goto error; | |
836 | } | |
837 | ||
838 | if (set_signal_handler() < 0) { | |
839 | goto error; | |
840 | } | |
841 | ||
842 | /* Setup the two needed unix socket */ | |
843 | if (init_daemon_socket() < 0) { | |
844 | goto error; | |
845 | } | |
846 | ||
847 | /* Set credentials to socket */ | |
848 | if (is_root && (set_socket_perms() < 0)) { | |
849 | goto error; | |
850 | } | |
851 | ||
5b8719f5 DG |
852 | /* Get parent pid if -S, --sig-parent is specified. */ |
853 | if (opt_sig_parent) { | |
854 | ppid = getppid(); | |
855 | } | |
856 | ||
fac6795d DG |
857 | while (1) { |
858 | /* Create thread to manage the client socket */ | |
859 | ret = pthread_create(&threads[0], NULL, thread_manage_clients, (void *) NULL); | |
860 | if (ret != 0) { | |
861 | perror("pthread_create"); | |
862 | goto error; | |
863 | } | |
864 | ||
865 | /* Create thread to manage application socket */ | |
866 | ret = pthread_create(&threads[1], NULL, thread_manage_apps, (void *) NULL); | |
867 | if (ret != 0) { | |
868 | perror("pthread_create"); | |
869 | goto error; | |
870 | } | |
871 | ||
872 | for (i = 0; i < 2; i++) { | |
873 | ret = pthread_join(threads[i], &status); | |
874 | if (ret != 0) { | |
875 | perror("pthread_join"); | |
876 | goto error; | |
877 | } | |
878 | } | |
879 | } | |
880 | ||
881 | cleanup(); | |
882 | return 0; | |
883 | ||
884 | error: | |
885 | cleanup(); | |
886 | ||
887 | return EXIT_FAILURE; | |
888 | } |