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 /* FIXME use stack here! */
227 /* FIXME */
228 #if 0
229 char *host;
230 char *type;
231 char *instance;
232 char *values;
234 while (loop == 0)
235 {
236 if (network_receive (&host, &type, &instance, &values) == 0)
237 plugin_write (host, type, instance, values);
239 if (host != NULL) free (host); host = NULL;
240 if (type != NULL) free (type); type = NULL;
241 if (instance != NULL) free (instance); instance = NULL;
242 if (values != NULL) free (values); values = NULL;
243 }
245 #endif
246 return (0);
247 } /* static int start_server (void) */
248 #endif /* HAVE_LIBRRD */
250 #if COLLECT_DAEMON
251 static int pidfile_create (const char *file)
252 {
253 FILE *fh;
255 if (file == NULL)
256 file = PIDFILE;
258 if ((fh = fopen (file, "w")) == NULL)
259 {
260 syslog (LOG_ERR, "fopen (%s): %s", file, strerror (errno));
261 return (1);
262 }
264 fprintf (fh, "%i\n", (int) getpid ());
265 fclose(fh);
267 return (0);
268 } /* static int pidfile_create (const char *file) */
269 #endif /* COLLECT_DAEMON */
271 #if COLLECT_DAEMON
272 static int pidfile_remove (const char *file)
273 {
274 if (file == NULL) {
275 file = PIDFILE;
276 }
277 return (unlink (file));
278 } /* static int pidfile_remove (const char *file) */
279 #endif /* COLLECT_DAEMON */
281 int main (int argc, char **argv)
282 {
283 struct sigaction sigIntAction;
284 struct sigaction sigTermAction;
285 char *datadir = PKGLOCALSTATEDIR;
286 char *configfile = CONFIGFILE;
287 #if COLLECT_DAEMON
288 struct sigaction sigChldAction;
289 char *pidfile = NULL;
290 pid_t pid;
291 int daemonize = 1;
292 #endif
293 #if COLLECT_DEBUG
294 char *logfile = LOGFILE;
295 #endif
297 #if HAVE_LIBRRD
298 operating_mode = MODE_LOCAL;
299 #else
300 operating_mode = MODE_CLIENT;
301 #endif
303 /* open syslog */
304 openlog (PACKAGE, LOG_CONS | LOG_PID, LOG_DAEMON);
306 /* read options */
307 while (1)
308 {
309 int c;
311 c = getopt (argc, argv, "hC:"
312 #if COLLECT_DAEMON
313 "fP:"
314 #endif
315 );
317 if (c == -1)
318 break;
320 switch (c)
321 {
322 case 'C':
323 configfile = optarg;
324 break;
325 #if COLLECT_DAEMON
326 case 'P':
327 pidfile = optarg;
328 break;
329 case 'f':
330 daemonize = 0;
331 break;
332 #endif /* COLLECT_DAEMON */
333 case 'h':
334 default:
335 exit_usage (argv[0]);
336 } /* switch (c) */
337 } /* while (1) */
339 #if COLLECT_DEBUG
340 if ((logfile = cf_get_option ("LogFile", LOGFILE)) != NULL)
341 DBG_STARTFILE (logfile, "Debug file opened.");
342 #endif
344 /*
345 * Read options from the config file, the environment and the command
346 * line (in that order, with later options overwriting previous ones in
347 * general).
348 * Also, this will automatically load modules.
349 */
350 if (cf_read (configfile))
351 {
352 fprintf (stderr, "Error: Reading the config file failed!\n"
353 "Read the syslog for details.\n");
354 return (1);
355 }
357 /*
358 * Change directory. We do this _after_ reading the config and loading
359 * modules to relative paths work as expected.
360 */
361 if ((datadir = cf_get_option ("DataDir", PKGLOCALSTATEDIR)) == NULL)
362 {
363 fprintf (stderr, "Don't have a datadir to use. This should not happen. Ever.");
364 return (1);
365 }
366 if (change_basedir (datadir))
367 {
368 fprintf (stderr, "Error: Unable to change to directory `%s'.\n", datadir);
369 return (1);
370 }
372 #if COLLECT_DAEMON
373 /*
374 * fork off child
375 */
376 sigChldAction.sa_handler = SIG_IGN;
377 sigaction (SIGCHLD, &sigChldAction, NULL);
379 if ((pidfile == NULL)
380 && ((pidfile = cf_get_option ("PIDFile", PIDFILE)) == NULL))
381 {
382 fprintf (stderr, "Cannot obtain pidfile. This shoud not happen. Ever.");
383 return (1);
384 }
386 if (daemonize)
387 {
388 if ((pid = fork ()) == -1)
389 {
390 /* error */
391 fprintf (stderr, "fork: %s", strerror (errno));
392 return (1);
393 }
394 else if (pid != 0)
395 {
396 /* parent */
397 /* printf ("Running (PID %i)\n", pid); */
398 return (0);
399 }
401 /* Detach from session */
402 setsid ();
404 /* Write pidfile */
405 if (pidfile_create (pidfile))
406 exit (2);
408 /* close standard descriptors */
409 close (2);
410 close (1);
411 close (0);
413 if (open ("/dev/null", O_RDWR) != 0)
414 {
415 syslog (LOG_ERR, "Error: Could not connect `STDIN' to `/dev/null'");
416 return (1);
417 }
418 if (dup (0) != 1)
419 {
420 syslog (LOG_ERR, "Error: Could not connect `STDOUT' to `/dev/null'");
421 return (1);
422 }
423 if (dup (0) != 2)
424 {
425 syslog (LOG_ERR, "Error: Could not connect `STDERR' to `/dev/null'");
426 return (1);
427 }
428 } /* if (daemonize) */
429 #endif /* COLLECT_DAEMON */
431 /*
432 * install signal handlers
433 */
434 sigIntAction.sa_handler = sigIntHandler;
435 sigaction (SIGINT, &sigIntAction, NULL);
437 sigTermAction.sa_handler = sigTermHandler;
438 sigaction (SIGTERM, &sigTermAction, NULL);
440 /*
441 * run the actual loops
442 */
443 #if HAVE_LIBRRD
444 if (operating_mode == MODE_SERVER)
445 start_server ();
446 else /* if (operating_mode == MODE_CLIENT || operating_mode == MODE_LOCAL || operating_mode == MODE_LOG) */
447 #endif
448 start_client ();
450 plugin_shutdown_all ();
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) */