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 #if COLLECT_DAEMON
127 " -f Don't fork to the background.\n"
128 #endif
129 "\nBuiltin defaults:\n"
130 " Config-File "CONFIGFILE"\n"
131 " PID-File "PIDFILE"\n"
132 " Data-Directory "PKGLOCALSTATEDIR"\n"
133 #if COLLECT_DEBUG
134 " Log-File "LOGFILE"\n"
135 #endif
136 " Step "COLLECTD_STEP" seconds\n"
137 " Heartbeat "COLLECTD_HEARTBEAT" seconds\n"
138 "\n"PACKAGE" "VERSION", http://collectd.org/\n"
139 "by Florian octo Forster <octo@verplant.org>\n"
140 "for contributions see `AUTHORS'\n");
141 exit (0);
142 } /* static void exit_usage (char *name) */
144 static int start_client (void)
145 {
146 int step;
148 struct timeval tv_now;
149 struct timeval tv_next;
150 struct timespec ts_wait;
152 step = atoi (COLLECTD_STEP);
153 if (step <= 0)
154 step = 10;
156 #if HAVE_LIBKSTAT
157 kc = NULL;
158 update_kstat ();
159 #endif
161 #if HAVE_LIBSTATGRAB
162 if (sg_init ())
163 {
164 syslog (LOG_ERR, "sg_init: %s", sg_str_error (sg_get_error ()));
165 return (-1);
166 }
168 if (sg_drop_privileges ())
169 {
170 syslog (LOG_ERR, "sg_drop_privileges: %s", sg_str_error (sg_get_error ()));
171 return (-1);
172 }
173 #endif
175 plugin_init_all ();
177 while (loop == 0)
178 {
179 if (gettimeofday (&tv_next, NULL) < 0)
180 {
181 syslog (LOG_ERR, "gettimeofday failed: %s", strerror (errno));
182 return (-1);
183 }
184 tv_next.tv_sec += step;
186 #if HAVE_LIBKSTAT
187 update_kstat ();
188 #endif
189 /* `curtime' is used by many (all?) plugins as the
190 * data-sample-time passed to RRDTool */
191 curtime = time (NULL);
193 /* Issue all plugins */
194 plugin_read_all ();
196 if (gettimeofday (&tv_now, NULL) < 0)
197 {
198 syslog (LOG_ERR, "gettimeofday failed: %s", strerror (errno));
199 return (-1);
200 }
202 if (timeval_sub_timespec (&tv_next, &tv_now, &ts_wait) != 0)
203 {
204 syslog (LOG_WARNING, "Not sleeping because `timeval_sub_timespec' returned non-zero!");
205 continue;
206 }
208 while (nanosleep (&ts_wait, &ts_wait) == -1)
209 {
210 if (errno != EINTR)
211 {
212 syslog (LOG_ERR, "nanosleep failed: %s", strerror (errno));
213 break;
214 }
215 }
216 }
218 return (0);
219 } /* static int start_client (void) */
221 #if HAVE_LIBRRD
222 static int start_server (void)
223 {
224 char *host;
225 char *type;
226 char *instance;
227 char *values;
229 int error_counter = 0;
230 int status;
232 while ((loop == 0) && (error_counter < 3))
233 {
234 status = network_receive (&host, &type, &instance, &values);
236 if (status != 0)
237 {
238 if (status < 0)
239 error_counter++;
240 continue;
241 }
242 error_counter = 0;
244 plugin_write (host, type, instance, values);
246 if (host != NULL) free (host); host = NULL;
247 if (type != NULL) free (type); type = NULL;
248 if (instance != NULL) free (instance); instance = NULL;
249 if (values != NULL) free (values); values = NULL;
250 }
252 return (0);
253 } /* static int start_server (void) */
254 #endif /* HAVE_LIBRRD */
256 #if COLLECT_DAEMON
257 static int pidfile_create (const char *file)
258 {
259 FILE *fh;
261 if (file == NULL)
262 file = PIDFILE;
264 if ((fh = fopen (file, "w")) == NULL)
265 {
266 syslog (LOG_ERR, "fopen (%s): %s", file, strerror (errno));
267 return (1);
268 }
270 fprintf (fh, "%i\n", (int) getpid ());
271 fclose(fh);
273 return (0);
274 } /* static int pidfile_create (const char *file) */
275 #endif /* COLLECT_DAEMON */
277 #if COLLECT_DAEMON
278 static int pidfile_remove (const char *file)
279 {
280 if (file == NULL) {
281 file = PIDFILE;
282 }
283 return (unlink (file));
284 } /* static int pidfile_remove (const char *file) */
285 #endif /* COLLECT_DAEMON */
287 int main (int argc, char **argv)
288 {
289 struct sigaction sigIntAction;
290 struct sigaction sigTermAction;
291 char *datadir = PKGLOCALSTATEDIR;
292 char *configfile = CONFIGFILE;
293 #if COLLECT_DAEMON
294 struct sigaction sigChldAction;
295 char *pidfile = PIDFILE;
296 pid_t pid;
297 int daemonize = 1;
298 #endif
299 #if COLLECT_DEBUG
300 char *logfile = LOGFILE;
301 #endif
303 #if HAVE_LIBRRD
304 operating_mode = MODE_LOCAL;
305 #else
306 operating_mode = MODE_CLIENT;
307 #endif
309 /* open syslog */
310 openlog (PACKAGE, LOG_CONS | LOG_PID, LOG_DAEMON);
312 /* read options */
313 while (1)
314 {
315 int c;
317 c = getopt (argc, argv, "hC:"
318 #if COLLECT_DAEMON
319 "f"
320 #endif
321 );
323 if (c == -1)
324 break;
326 switch (c)
327 {
328 case 'C':
329 configfile = optarg;
330 break;
331 #if COLLECT_DAEMON
332 case 'f':
333 daemonize = 0;
334 break;
335 #endif /* COLLECT_DAEMON */
336 case 'h':
337 default:
338 exit_usage (argv[0]);
339 } /* switch (c) */
340 } /* while (1) */
342 #if COLLECT_DEBUG
343 if ((logfile = cf_get_option ("LogFile", LOGFILE)) != NULL)
344 DBG_STARTFILE (logfile, "Debug file opened.");
345 #endif
347 /*
348 * Read options from the config file, the environment and the command
349 * line (in that order, with later options overwriting previous ones in
350 * general).
351 * Also, this will automatically load modules.
352 */
353 if (cf_read (configfile))
354 {
355 fprintf (stderr, "Error: Reading the config file failed!\n"
356 "Read the syslog for details.\n");
357 return (1);
358 }
360 /*
361 * Change directory. We do this _after_ reading the config and loading
362 * modules to relative paths work as expected.
363 */
364 if ((datadir = cf_get_option ("DataDir", PKGLOCALSTATEDIR)) == NULL)
365 {
366 fprintf (stderr, "Don't have a datadir to use. This should not happen. Ever.");
367 return (1);
368 }
369 if (change_basedir (datadir))
370 {
371 fprintf (stderr, "Error: Unable to change to directory `%s'.\n", datadir);
372 return (1);
373 }
375 #if COLLECT_DAEMON
376 /*
377 * fork off child
378 */
379 sigChldAction.sa_handler = SIG_IGN;
380 sigaction (SIGCHLD, &sigChldAction, NULL);
382 if ((pidfile = cf_get_option ("PIDFile", PIDFILE)) == NULL)
383 {
384 fprintf (stderr, "Cannot obtain pidfile. This shoud not happen. Ever.");
385 return (1);
386 }
388 if (daemonize)
389 {
390 if ((pid = fork ()) == -1)
391 {
392 /* error */
393 fprintf (stderr, "fork: %s", strerror (errno));
394 return (1);
395 }
396 else if (pid != 0)
397 {
398 /* parent */
399 /* printf ("Running (PID %i)\n", pid); */
400 return (0);
401 }
403 /* Detach from session */
404 setsid ();
406 /* Write pidfile */
407 if (pidfile_create (pidfile))
408 exit (2);
410 /* close standard descriptors */
411 close (2);
412 close (1);
413 close (0);
415 if (open ("/dev/null", O_RDWR) != 0)
416 {
417 syslog (LOG_ERR, "Error: Could not connect `STDIN' to `/dev/null'");
418 return (1);
419 }
420 if (dup (0) != 1)
421 {
422 syslog (LOG_ERR, "Error: Could not connect `STDOUT' to `/dev/null'");
423 return (1);
424 }
425 if (dup (0) != 2)
426 {
427 syslog (LOG_ERR, "Error: Could not connect `STDERR' to `/dev/null'");
428 return (1);
429 }
430 } /* if (daemonize) */
431 #endif /* COLLECT_DAEMON */
433 /*
434 * install signal handlers
435 */
436 sigIntAction.sa_handler = sigIntHandler;
437 sigaction (SIGINT, &sigIntAction, NULL);
439 sigTermAction.sa_handler = sigTermHandler;
440 sigaction (SIGTERM, &sigTermAction, NULL);
442 /*
443 * run the actual loops
444 */
445 #if HAVE_LIBRRD
446 if (operating_mode == MODE_SERVER)
447 start_server ();
448 else /* if (operating_mode == MODE_CLIENT || operating_mode == MODE_LOCAL || operating_mode == MODE_LOG) */
449 #endif
450 start_client ();
452 #if COLLECT_DEBUG
453 if (logfile != NULL)
454 DBG_STOPFILE("debug file closed.");
455 #endif
457 /* close syslog */
458 syslog (LOG_INFO, "Exiting normally");
459 closelog ();
461 #if COLLECT_DAEMON
462 if (daemonize)
463 pidfile_remove (pidfile);
464 #endif /* COLLECT_DAEMON */
466 return (0);
467 } /* int main (int argc, char **argv) */