1 /**
2 * collectd - src/collectd.c
3 * Copyright (C) 2005,2006 Florian octo Forster
4 *
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License as published by the
7 * Free Software Foundation; either version 2 of the License, or (at your
8 * option) any later version.
9 *
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License along
16 * with this program; if not, write to the Free Software Foundation, Inc.,
17 * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
18 *
19 * Authors:
20 * Florian octo Forster <octo at verplant.org>
21 * Alvaro Barcellos <alvaro.barcellos at gmail.com>
22 **/
24 #include "collectd.h"
25 #include "common.h"
26 #include "utils_debug.h"
28 #include "network.h"
29 #include "plugin.h"
30 #include "configfile.h"
32 static int loop = 0;
34 #if HAVE_LIBKSTAT
35 kstat_ctl_t *kc;
36 #endif /* HAVE_LIBKSTAT */
38 /*
39 * exported variables
40 */
41 time_t curtime;
42 int operating_mode;
44 static void sigIntHandler (int signal)
45 {
46 loop++;
47 }
49 static void sigTermHandler (int signal)
50 {
51 loop++;
52 }
54 static int change_basedir (char *dir)
55 {
56 int dirlen = strlen (dir);
58 while ((dirlen > 0) && (dir[dirlen - 1] == '/'))
59 dir[--dirlen] = '\0';
61 if (dirlen <= 0)
62 return (-1);
64 if (chdir (dir) == -1)
65 {
66 if (errno == ENOENT)
67 {
68 if (mkdir (dir, 0755) == -1)
69 {
70 syslog (LOG_ERR, "mkdir (%s): %s", dir, strerror (errno));
71 return (-1);
72 }
73 else if (chdir (dir) == -1)
74 {
75 syslog (LOG_ERR, "chdir (%s): %s", dir, strerror (errno));
76 return (-1);
77 }
78 }
79 else
80 {
81 syslog (LOG_ERR, "chdir: %s", strerror (errno));
82 return (-1);
83 }
84 }
86 return (0);
87 } /* static int change_basedir (char *dir) */
89 #if HAVE_LIBKSTAT
90 static void update_kstat (void)
91 {
92 if (kc == NULL)
93 {
94 if ((kc = kstat_open ()) == NULL)
95 syslog (LOG_ERR, "Unable to open kstat control structure");
96 }
97 else
98 {
99 kid_t kid;
100 kid = kstat_chain_update (kc);
101 if (kid > 0)
102 {
103 syslog (LOG_INFO, "kstat chain has been updated");
104 plugin_init_all ();
105 }
106 else if (kid < 0)
107 syslog (LOG_ERR, "kstat chain update failed");
108 /* else: everything works as expected */
109 }
111 return;
112 } /* static void update_kstat (void) */
113 #endif /* HAVE_LIBKSTAT */
115 /* TODO
116 * Remove all settings but `-f' and `-C'
117 */
118 static void exit_usage (char *name)
119 {
120 printf ("Usage: "PACKAGE" [OPTIONS]\n\n"
122 "Available options:\n"
123 " General:\n"
124 " -C <file> Configuration file.\n"
125 " Default: "CONFIGFILE"\n"
126 " -P <file> PID-file.\n"
127 " Default: "PIDFILE"\n"
128 #if COLLECT_DAEMON
129 " -f Don't fork to the background.\n"
130 #endif
131 "\nBuiltin defaults:\n"
132 " Config-File "CONFIGFILE"\n"
133 " PID-File "PIDFILE"\n"
134 " Data-Directory "PKGLOCALSTATEDIR"\n"
135 #if COLLECT_DEBUG
136 " Log-File "LOGFILE"\n"
137 #endif
138 " Step "COLLECTD_STEP" seconds\n"
139 " Heartbeat "COLLECTD_HEARTBEAT" seconds\n"
140 "\n"PACKAGE" "VERSION", http://collectd.org/\n"
141 "by Florian octo Forster <octo@verplant.org>\n"
142 "for contributions see `AUTHORS'\n");
143 exit (0);
144 } /* static void exit_usage (char *name) */
146 static int start_client (void)
147 {
148 int step;
150 struct timeval tv_now;
151 struct timeval tv_next;
152 struct timespec ts_wait;
154 step = atoi (COLLECTD_STEP);
155 if (step <= 0)
156 step = 10;
158 #if HAVE_LIBKSTAT
159 kc = NULL;
160 update_kstat ();
161 #endif
163 #if HAVE_LIBSTATGRAB
164 if (sg_init ())
165 {
166 syslog (LOG_ERR, "sg_init: %s", sg_str_error (sg_get_error ()));
167 return (-1);
168 }
170 if (sg_drop_privileges ())
171 {
172 syslog (LOG_ERR, "sg_drop_privileges: %s", sg_str_error (sg_get_error ()));
173 return (-1);
174 }
175 #endif
177 plugin_init_all ();
179 while (loop == 0)
180 {
181 if (gettimeofday (&tv_next, NULL) < 0)
182 {
183 syslog (LOG_ERR, "gettimeofday failed: %s", strerror (errno));
184 return (-1);
185 }
186 tv_next.tv_sec += step;
188 #if HAVE_LIBKSTAT
189 update_kstat ();
190 #endif
191 /* `curtime' is used by many (all?) plugins as the
192 * data-sample-time passed to RRDTool */
193 curtime = time (NULL);
195 /* Issue all plugins */
196 plugin_read_all (&loop);
198 if (gettimeofday (&tv_now, NULL) < 0)
199 {
200 syslog (LOG_ERR, "gettimeofday failed: %s", strerror (errno));
201 return (-1);
202 }
204 if (timeval_sub_timespec (&tv_next, &tv_now, &ts_wait) != 0)
205 {
206 syslog (LOG_WARNING, "Not sleeping because `timeval_sub_timespec' returned non-zero!");
207 continue;
208 }
210 while ((loop == 0) && (nanosleep (&ts_wait, &ts_wait) == -1))
211 {
212 if (errno != EINTR)
213 {
214 syslog (LOG_ERR, "nanosleep failed: %s", strerror (errno));
215 break;
216 }
217 }
218 }
220 return (0);
221 } /* static int start_client (void) */
223 #if HAVE_LIBRRD
224 static int start_server (void)
225 {
226 char *host;
227 char *type;
228 char *instance;
229 char *values;
231 int error_counter = 0;
232 int status;
234 while ((loop == 0) && (error_counter < 3))
235 {
236 status = network_receive (&host, &type, &instance, &values);
238 if (status != 0)
239 {
240 if (status < 0)
241 error_counter++;
242 continue;
243 }
244 error_counter = 0;
246 plugin_write (host, type, instance, values);
248 if (host != NULL) free (host); host = NULL;
249 if (type != NULL) free (type); type = NULL;
250 if (instance != NULL) free (instance); instance = NULL;
251 if (values != NULL) free (values); values = NULL;
252 }
254 return (0);
255 } /* static int start_server (void) */
256 #endif /* HAVE_LIBRRD */
258 #if COLLECT_DAEMON
259 static int pidfile_create (const char *file)
260 {
261 FILE *fh;
263 if (file == NULL)
264 file = PIDFILE;
266 if ((fh = fopen (file, "w")) == NULL)
267 {
268 syslog (LOG_ERR, "fopen (%s): %s", file, strerror (errno));
269 return (1);
270 }
272 fprintf (fh, "%i\n", (int) getpid ());
273 fclose(fh);
275 return (0);
276 } /* static int pidfile_create (const char *file) */
277 #endif /* COLLECT_DAEMON */
279 #if COLLECT_DAEMON
280 static int pidfile_remove (const char *file)
281 {
282 if (file == NULL) {
283 file = PIDFILE;
284 }
285 return (unlink (file));
286 } /* static int pidfile_remove (const char *file) */
287 #endif /* COLLECT_DAEMON */
289 int main (int argc, char **argv)
290 {
291 struct sigaction sigIntAction;
292 struct sigaction sigTermAction;
293 char *datadir = PKGLOCALSTATEDIR;
294 char *configfile = CONFIGFILE;
295 #if COLLECT_DAEMON
296 struct sigaction sigChldAction;
297 char *pidfile = NULL;
298 pid_t pid;
299 int daemonize = 1;
300 #endif
301 #if COLLECT_DEBUG
302 char *logfile = LOGFILE;
303 #endif
305 #if HAVE_LIBRRD
306 operating_mode = MODE_LOCAL;
307 #else
308 operating_mode = MODE_CLIENT;
309 #endif
311 /* open syslog */
312 openlog (PACKAGE, LOG_CONS | LOG_PID, LOG_DAEMON);
314 /* read options */
315 while (1)
316 {
317 int c;
319 c = getopt (argc, argv, "hC:"
320 #if COLLECT_DAEMON
321 "fP:"
322 #endif
323 );
325 if (c == -1)
326 break;
328 switch (c)
329 {
330 case 'C':
331 configfile = optarg;
332 break;
333 #if COLLECT_DAEMON
334 case 'P':
335 pidfile = optarg;
336 break;
337 case 'f':
338 daemonize = 0;
339 break;
340 #endif /* COLLECT_DAEMON */
341 case 'h':
342 default:
343 exit_usage (argv[0]);
344 } /* switch (c) */
345 } /* while (1) */
347 #if COLLECT_DEBUG
348 if ((logfile = cf_get_option ("LogFile", LOGFILE)) != NULL)
349 DBG_STARTFILE (logfile, "Debug file opened.");
350 #endif
352 /*
353 * Read options from the config file, the environment and the command
354 * line (in that order, with later options overwriting previous ones in
355 * general).
356 * Also, this will automatically load modules.
357 */
358 if (cf_read (configfile))
359 {
360 fprintf (stderr, "Error: Reading the config file failed!\n"
361 "Read the syslog for details.\n");
362 return (1);
363 }
365 /*
366 * Change directory. We do this _after_ reading the config and loading
367 * modules to relative paths work as expected.
368 */
369 if ((datadir = cf_get_option ("DataDir", PKGLOCALSTATEDIR)) == NULL)
370 {
371 fprintf (stderr, "Don't have a datadir to use. This should not happen. Ever.");
372 return (1);
373 }
374 if (change_basedir (datadir))
375 {
376 fprintf (stderr, "Error: Unable to change to directory `%s'.\n", datadir);
377 return (1);
378 }
380 #if COLLECT_DAEMON
381 /*
382 * fork off child
383 */
384 sigChldAction.sa_handler = SIG_IGN;
385 sigaction (SIGCHLD, &sigChldAction, NULL);
387 if ((pidfile == NULL)
388 && ((pidfile = cf_get_option ("PIDFile", PIDFILE)) == NULL))
389 {
390 fprintf (stderr, "Cannot obtain pidfile. This shoud not happen. Ever.");
391 return (1);
392 }
394 if (daemonize)
395 {
396 if ((pid = fork ()) == -1)
397 {
398 /* error */
399 fprintf (stderr, "fork: %s", strerror (errno));
400 return (1);
401 }
402 else if (pid != 0)
403 {
404 /* parent */
405 /* printf ("Running (PID %i)\n", pid); */
406 return (0);
407 }
409 /* Detach from session */
410 setsid ();
412 /* Write pidfile */
413 if (pidfile_create (pidfile))
414 exit (2);
416 /* close standard descriptors */
417 close (2);
418 close (1);
419 close (0);
421 if (open ("/dev/null", O_RDWR) != 0)
422 {
423 syslog (LOG_ERR, "Error: Could not connect `STDIN' to `/dev/null'");
424 return (1);
425 }
426 if (dup (0) != 1)
427 {
428 syslog (LOG_ERR, "Error: Could not connect `STDOUT' to `/dev/null'");
429 return (1);
430 }
431 if (dup (0) != 2)
432 {
433 syslog (LOG_ERR, "Error: Could not connect `STDERR' to `/dev/null'");
434 return (1);
435 }
436 } /* if (daemonize) */
437 #endif /* COLLECT_DAEMON */
439 /*
440 * install signal handlers
441 */
442 sigIntAction.sa_handler = sigIntHandler;
443 sigaction (SIGINT, &sigIntAction, NULL);
445 sigTermAction.sa_handler = sigTermHandler;
446 sigaction (SIGTERM, &sigTermAction, NULL);
448 /*
449 * run the actual loops
450 */
451 #if HAVE_LIBRRD
452 if (operating_mode == MODE_SERVER)
453 start_server ();
454 else /* if (operating_mode == MODE_CLIENT || operating_mode == MODE_LOCAL || operating_mode == MODE_LOG) */
455 #endif
456 start_client ();
458 plugin_shutdown_all ();
460 #if COLLECT_DEBUG
461 if (logfile != NULL)
462 DBG_STOPFILE("debug file closed.");
463 #endif
465 /* close syslog */
466 syslog (LOG_INFO, "Exiting normally");
467 closelog ();
469 #if COLLECT_DAEMON
470 if (daemonize)
471 pidfile_remove (pidfile);
472 #endif /* COLLECT_DAEMON */
474 return (0);
475 } /* int main (int argc, char **argv) */