2e2d821aade194873c923ceabcf8951291d0dc69
1 /**
2 * collectd - src/collectd.c
3 * Copyright (C) 2005-2007 Florian octo Forster
4 *
5 * Permission is hereby granted, free of charge, to any person obtaining a
6 * copy of this software and associated documentation files (the "Software"),
7 * to deal in the Software without restriction, including without limitation
8 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
9 * and/or sell copies of the Software, and to permit persons to whom the
10 * Software is furnished to do so, subject to the following conditions:
11 *
12 * The above copyright notice and this permission notice shall be included in
13 * all copies or substantial portions of the Software.
14 *
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
18 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
21 * DEALINGS IN THE SOFTWARE.
22 *
23 * Authors:
24 * Florian octo Forster <octo at collectd.org>
25 * Alvaro Barcellos <alvaro.barcellos at gmail.com>
26 **/
28 #include "collectd.h"
29 #include "common.h"
31 #include "plugin.h"
32 #include "configfile.h"
34 #include <sys/types.h>
35 #include <sys/socket.h>
36 #include <netdb.h>
38 #include <pthread.h>
40 #if HAVE_LOCALE_H
41 # include <locale.h>
42 #endif
44 #if HAVE_STATGRAB_H
45 # include <statgrab.h>
46 #endif
48 #ifndef COLLECTD_LOCALE
49 # define COLLECTD_LOCALE "C"
50 #endif
52 /*
53 * Global variables
54 */
55 char hostname_g[DATA_MAX_NAME_LEN];
56 cdtime_t interval_g;
57 int pidfile_from_cli = 0;
58 int timeout_g;
59 #if HAVE_LIBKSTAT
60 kstat_ctl_t *kc;
61 #endif /* HAVE_LIBKSTAT */
63 static int loop = 0;
65 static void *do_flush (void __attribute__((unused)) *arg)
66 {
67 INFO ("Flushing all data.");
68 plugin_flush (/* plugin = */ NULL,
69 /* timeout = */ 0,
70 /* ident = */ NULL);
71 INFO ("Finished flushing all data.");
72 pthread_exit (NULL);
73 return NULL;
74 }
76 static void sig_int_handler (int __attribute__((unused)) signal)
77 {
78 loop++;
79 }
81 static void sig_term_handler (int __attribute__((unused)) signal)
82 {
83 loop++;
84 }
86 static void sig_usr1_handler (int __attribute__((unused)) signal)
87 {
88 pthread_t thread;
89 pthread_attr_t attr;
91 /* flushing the data might take a while,
92 * so it should be done asynchronously */
93 pthread_attr_init (&attr);
94 pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED);
95 pthread_create (&thread, &attr, do_flush, NULL);
96 pthread_attr_destroy (&attr);
97 }
99 static int init_hostname (void)
100 {
101 const char *str;
103 struct addrinfo ai_hints;
104 struct addrinfo *ai_list;
105 struct addrinfo *ai_ptr;
106 int status;
108 str = global_option_get ("Hostname");
109 if (str != NULL)
110 {
111 sstrncpy (hostname_g, str, sizeof (hostname_g));
112 return (0);
113 }
115 if (gethostname (hostname_g, sizeof (hostname_g)) != 0)
116 {
117 fprintf (stderr, "`gethostname' failed and no "
118 "hostname was configured.\n");
119 return (-1);
120 }
122 str = global_option_get ("FQDNLookup");
123 if (IS_FALSE (str))
124 return (0);
126 memset (&ai_hints, '\0', sizeof (ai_hints));
127 ai_hints.ai_flags = AI_CANONNAME;
129 status = getaddrinfo (hostname_g, NULL, &ai_hints, &ai_list);
130 if (status != 0)
131 {
132 ERROR ("Looking up \"%s\" failed. You have set the "
133 "\"FQDNLookup\" option, but I cannot resolve "
134 "my hostname to a fully qualified domain "
135 "name. Please fix the network "
136 "configuration.", hostname_g);
137 return (-1);
138 }
140 for (ai_ptr = ai_list; ai_ptr != NULL; ai_ptr = ai_ptr->ai_next)
141 {
142 if (ai_ptr->ai_canonname == NULL)
143 continue;
145 sstrncpy (hostname_g, ai_ptr->ai_canonname, sizeof (hostname_g));
146 break;
147 }
149 freeaddrinfo (ai_list);
150 return (0);
151 } /* int init_hostname */
153 static int init_global_variables (void)
154 {
155 char const *str;
157 interval_g = cf_get_default_interval ();
158 assert (interval_g > 0);
159 DEBUG ("interval_g = %.3f;", CDTIME_T_TO_DOUBLE (interval_g));
161 str = global_option_get ("Timeout");
162 if (str == NULL)
163 str = "2";
164 timeout_g = atoi (str);
165 if (timeout_g <= 1)
166 {
167 fprintf (stderr, "Cannot set the timeout to a correct value.\n"
168 "Please check your settings.\n");
169 return (-1);
170 }
171 DEBUG ("timeout_g = %i;", timeout_g);
173 if (init_hostname () != 0)
174 return (-1);
175 DEBUG ("hostname_g = %s;", hostname_g);
177 return (0);
178 } /* int init_global_variables */
180 static int change_basedir (const char *orig_dir)
181 {
182 char *dir;
183 size_t dirlen;
184 int status;
186 dir = strdup (orig_dir);
187 if (dir == NULL)
188 {
189 char errbuf[1024];
190 ERROR ("strdup failed: %s",
191 sstrerror (errno, errbuf, sizeof (errbuf)));
192 return (-1);
193 }
195 dirlen = strlen (dir);
196 while ((dirlen > 0) && (dir[dirlen - 1] == '/'))
197 dir[--dirlen] = '\0';
199 if (dirlen <= 0)
200 return (-1);
202 status = chdir (dir);
203 if (status == 0)
204 {
205 free (dir);
206 return (0);
207 }
208 else if (errno != ENOENT)
209 {
210 char errbuf[1024];
211 ERROR ("change_basedir: chdir (%s): %s", dir,
212 sstrerror (errno, errbuf, sizeof (errbuf)));
213 free (dir);
214 return (-1);
215 }
217 status = mkdir (dir, S_IRWXU | S_IRWXG | S_IRWXO);
218 if (status != 0)
219 {
220 char errbuf[1024];
221 ERROR ("change_basedir: mkdir (%s): %s", dir,
222 sstrerror (errno, errbuf, sizeof (errbuf)));
223 free (dir);
224 return (-1);
225 }
227 status = chdir (dir);
228 if (status != 0)
229 {
230 char errbuf[1024];
231 ERROR ("change_basedir: chdir (%s): %s", dir,
232 sstrerror (errno, errbuf, sizeof (errbuf)));
233 free (dir);
234 return (-1);
235 }
237 free (dir);
238 return (0);
239 } /* static int change_basedir (char *dir) */
241 #if HAVE_LIBKSTAT
242 static void update_kstat (void)
243 {
244 if (kc == NULL)
245 {
246 if ((kc = kstat_open ()) == NULL)
247 ERROR ("Unable to open kstat control structure");
248 }
249 else
250 {
251 kid_t kid;
252 kid = kstat_chain_update (kc);
253 if (kid > 0)
254 {
255 INFO ("kstat chain has been updated");
256 plugin_init_all ();
257 }
258 else if (kid < 0)
259 ERROR ("kstat chain update failed");
260 /* else: everything works as expected */
261 }
263 return;
264 } /* static void update_kstat (void) */
265 #endif /* HAVE_LIBKSTAT */
267 /* TODO
268 * Remove all settings but `-f' and `-C'
269 */
270 static void exit_usage (int status)
271 {
272 printf ("Usage: "PACKAGE" [OPTIONS]\n\n"
274 "Available options:\n"
275 " General:\n"
276 " -C <file> Configuration file.\n"
277 " Default: "CONFIGFILE"\n"
278 " -t Test config and exit.\n"
279 " -T Test plugin read and exit.\n"
280 " -P <file> PID-file.\n"
281 " Default: "PIDFILE"\n"
282 #if COLLECT_DAEMON
283 " -f Don't fork to the background.\n"
284 #endif
285 " -h Display help (this message)\n"
286 "\nBuiltin defaults:\n"
287 " Config file "CONFIGFILE"\n"
288 " PID file "PIDFILE"\n"
289 " Plugin directory "PLUGINDIR"\n"
290 " Data directory "PKGLOCALSTATEDIR"\n"
291 "\n"PACKAGE" "VERSION", http://collectd.org/\n"
292 "by Florian octo Forster <octo@collectd.org>\n"
293 "for contributions see `AUTHORS'\n");
294 exit (status);
295 } /* static void exit_usage (int status) */
297 static int do_init (void)
298 {
299 #if HAVE_SETLOCALE
300 if (setlocale (LC_NUMERIC, COLLECTD_LOCALE) == NULL)
301 WARNING ("setlocale (\"%s\") failed.", COLLECTD_LOCALE);
302 #endif
304 #if HAVE_LIBKSTAT
305 kc = NULL;
306 update_kstat ();
307 #endif
309 #if HAVE_LIBSTATGRAB
310 if (sg_init ())
311 {
312 ERROR ("sg_init: %s", sg_str_error (sg_get_error ()));
313 return (-1);
314 }
316 if (sg_drop_privileges ())
317 {
318 ERROR ("sg_drop_privileges: %s", sg_str_error (sg_get_error ()));
319 return (-1);
320 }
321 #endif
323 plugin_init_all ();
325 return (0);
326 } /* int do_init () */
329 static int do_loop (void)
330 {
331 cdtime_t interval = cf_get_default_interval ();
332 cdtime_t wait_until;
334 wait_until = cdtime () + interval;
336 while (loop == 0)
337 {
338 struct timespec ts_wait = { 0, 0 };
339 cdtime_t now;
341 #if HAVE_LIBKSTAT
342 update_kstat ();
343 #endif
345 /* Issue all plugins */
346 plugin_read_all ();
348 now = cdtime ();
349 if (now >= wait_until)
350 {
351 WARNING ("Not sleeping because the next interval is "
352 "%.3f seconds in the past!",
353 CDTIME_T_TO_DOUBLE (now - wait_until));
354 wait_until = now + interval;
355 continue;
356 }
358 CDTIME_T_TO_TIMESPEC (wait_until - now, &ts_wait);
359 wait_until = wait_until + interval;
361 while ((loop == 0) && (nanosleep (&ts_wait, &ts_wait) != 0))
362 {
363 if (errno != EINTR)
364 {
365 char errbuf[1024];
366 ERROR ("nanosleep failed: %s",
367 sstrerror (errno, errbuf,
368 sizeof (errbuf)));
369 return (-1);
370 }
371 }
372 } /* while (loop == 0) */
374 return (0);
375 } /* int do_loop */
377 static int do_shutdown (void)
378 {
379 plugin_shutdown_all ();
380 return (0);
381 } /* int do_shutdown */
383 #if COLLECT_DAEMON
384 static int pidfile_create (void)
385 {
386 FILE *fh;
387 const char *file = global_option_get ("PIDFile");
389 if ((fh = fopen (file, "w")) == NULL)
390 {
391 char errbuf[1024];
392 ERROR ("fopen (%s): %s", file,
393 sstrerror (errno, errbuf, sizeof (errbuf)));
394 return (1);
395 }
397 fprintf (fh, "%i\n", (int) getpid ());
398 fclose(fh);
400 return (0);
401 } /* static int pidfile_create (const char *file) */
403 static int pidfile_remove (void)
404 {
405 const char *file = global_option_get ("PIDFile");
407 DEBUG ("unlink (%s)", (file != NULL) ? file : "<null>");
408 return (unlink (file));
409 } /* static int pidfile_remove (const char *file) */
410 #endif /* COLLECT_DAEMON */
412 int main (int argc, char **argv)
413 {
414 struct sigaction sig_int_action;
415 struct sigaction sig_term_action;
416 struct sigaction sig_usr1_action;
417 struct sigaction sig_pipe_action;
418 char *configfile = CONFIGFILE;
419 int test_config = 0;
420 int test_readall = 0;
421 const char *basedir;
422 #if COLLECT_DAEMON
423 struct sigaction sig_chld_action;
424 pid_t pid;
425 int daemonize = 1;
426 #endif
427 int exit_status = 0;
429 /* read options */
430 while (1)
431 {
432 int c;
434 c = getopt (argc, argv, "htTC:"
435 #if COLLECT_DAEMON
436 "fP:"
437 #endif
438 );
440 if (c == -1)
441 break;
443 switch (c)
444 {
445 case 'C':
446 configfile = optarg;
447 break;
448 case 't':
449 test_config = 1;
450 break;
451 case 'T':
452 test_readall = 1;
453 global_option_set ("ReadThreads", "-1");
454 #if COLLECT_DAEMON
455 daemonize = 0;
456 #endif /* COLLECT_DAEMON */
457 break;
458 #if COLLECT_DAEMON
459 case 'P':
460 global_option_set ("PIDFile", optarg);
461 pidfile_from_cli = 1;
462 break;
463 case 'f':
464 daemonize = 0;
465 break;
466 #endif /* COLLECT_DAEMON */
467 case 'h':
468 exit_usage (0);
469 break;
470 default:
471 exit_usage (1);
472 } /* switch (c) */
473 } /* while (1) */
475 if (optind < argc)
476 exit_usage (1);
478 plugin_init_ctx ();
480 /*
481 * Read options from the config file, the environment and the command
482 * line (in that order, with later options overwriting previous ones in
483 * general).
484 * Also, this will automatically load modules.
485 */
486 if (cf_read (configfile))
487 {
488 fprintf (stderr, "Error: Reading the config file failed!\n"
489 "Read the syslog for details.\n");
490 return (1);
491 }
493 /*
494 * Change directory. We do this _after_ reading the config and loading
495 * modules to relative paths work as expected.
496 */
497 if ((basedir = global_option_get ("BaseDir")) == NULL)
498 {
499 fprintf (stderr, "Don't have a basedir to use. This should not happen. Ever.");
500 return (1);
501 }
502 else if (change_basedir (basedir))
503 {
504 fprintf (stderr, "Error: Unable to change to directory `%s'.\n", basedir);
505 return (1);
506 }
508 /*
509 * Set global variables or, if that failes, exit. We cannot run with
510 * them being uninitialized. If nothing is configured, then defaults
511 * are being used. So this means that the user has actually done
512 * something wrong.
513 */
514 if (init_global_variables () != 0)
515 return (1);
517 if (test_config)
518 return (0);
520 #if COLLECT_DAEMON
521 /*
522 * fork off child
523 */
524 memset (&sig_chld_action, '\0', sizeof (sig_chld_action));
525 sig_chld_action.sa_handler = SIG_IGN;
526 sigaction (SIGCHLD, &sig_chld_action, NULL);
528 if (daemonize)
529 {
530 if ((pid = fork ()) == -1)
531 {
532 /* error */
533 char errbuf[1024];
534 fprintf (stderr, "fork: %s",
535 sstrerror (errno, errbuf,
536 sizeof (errbuf)));
537 return (1);
538 }
539 else if (pid != 0)
540 {
541 /* parent */
542 /* printf ("Running (PID %i)\n", pid); */
543 return (0);
544 }
546 /* Detach from session */
547 setsid ();
549 /* Write pidfile */
550 if (pidfile_create ())
551 exit (2);
553 /* close standard descriptors */
554 close (2);
555 close (1);
556 close (0);
558 if (open ("/dev/null", O_RDWR) != 0)
559 {
560 ERROR ("Error: Could not connect `STDIN' to `/dev/null'");
561 return (1);
562 }
563 if (dup (0) != 1)
564 {
565 ERROR ("Error: Could not connect `STDOUT' to `/dev/null'");
566 return (1);
567 }
568 if (dup (0) != 2)
569 {
570 ERROR ("Error: Could not connect `STDERR' to `/dev/null'");
571 return (1);
572 }
573 } /* if (daemonize) */
574 #endif /* COLLECT_DAEMON */
576 memset (&sig_pipe_action, '\0', sizeof (sig_pipe_action));
577 sig_pipe_action.sa_handler = SIG_IGN;
578 sigaction (SIGPIPE, &sig_pipe_action, NULL);
580 /*
581 * install signal handlers
582 */
583 memset (&sig_int_action, '\0', sizeof (sig_int_action));
584 sig_int_action.sa_handler = sig_int_handler;
585 if (0 != sigaction (SIGINT, &sig_int_action, NULL)) {
586 char errbuf[1024];
587 ERROR ("Error: Failed to install a signal handler for signal INT: %s",
588 sstrerror (errno, errbuf, sizeof (errbuf)));
589 return (1);
590 }
592 memset (&sig_term_action, '\0', sizeof (sig_term_action));
593 sig_term_action.sa_handler = sig_term_handler;
594 if (0 != sigaction (SIGTERM, &sig_term_action, NULL)) {
595 char errbuf[1024];
596 ERROR ("Error: Failed to install a signal handler for signal TERM: %s",
597 sstrerror (errno, errbuf, sizeof (errbuf)));
598 return (1);
599 }
601 memset (&sig_usr1_action, '\0', sizeof (sig_usr1_action));
602 sig_usr1_action.sa_handler = sig_usr1_handler;
603 if (0 != sigaction (SIGUSR1, &sig_usr1_action, NULL)) {
604 char errbuf[1024];
605 ERROR ("Error: Failed to install a signal handler for signal USR1: %s",
606 sstrerror (errno, errbuf, sizeof (errbuf)));
607 return (1);
608 }
610 /*
611 * run the actual loops
612 */
613 do_init ();
615 if (test_readall)
616 {
617 if (plugin_read_all_once () != 0)
618 exit_status = 1;
619 }
620 else
621 {
622 INFO ("Initialization complete, entering read-loop.");
623 do_loop ();
624 }
626 /* close syslog */
627 INFO ("Exiting normally.");
629 do_shutdown ();
631 #if COLLECT_DAEMON
632 if (daemonize)
633 pidfile_remove ();
634 #endif /* COLLECT_DAEMON */
636 return (exit_status);
637 } /* int main */