5a17124e1daf1b0cc24fa9a38848727f1df4480c
1 /**
2 * collectd - src/collectd.c
3 * Copyright (C) 2005 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 #include "ping.h"
34 static int loop = 0;
36 #if HAVE_LIBKSTAT
37 kstat_ctl_t *kc;
38 #endif /* HAVE_LIBKSTAT */
40 /*
41 * exported variables
42 */
43 time_t curtime;
45 #if HAVE_LIBRRD
46 int operating_mode;
47 #endif
49 static void sigIntHandler (int signal)
50 {
51 loop++;
52 }
54 static void sigTermHandler (int signal)
55 {
56 loop++;
57 }
59 static int change_basedir (char *dir)
60 {
61 int dirlen = strlen (dir);
63 while ((dirlen > 0) && (dir[dirlen - 1] == '/'))
64 dir[--dirlen] = '\0';
66 if (dirlen <= 0)
67 return (-1);
69 if (chdir (dir) == -1)
70 {
71 if (errno == ENOENT)
72 {
73 if (mkdir (dir, 0755) == -1)
74 {
75 syslog (LOG_ERR, "mkdir (%s): %s", dir, strerror (errno));
76 return (-1);
77 }
78 else if (chdir (dir) == -1)
79 {
80 syslog (LOG_ERR, "chdir (%s): %s", dir, strerror (errno));
81 return (-1);
82 }
83 }
84 else
85 {
86 syslog (LOG_ERR, "chdir: %s", strerror (errno));
87 return (-1);
88 }
89 }
91 return (0);
92 } /* static int change_basedir (char *dir) */
94 #if HAVE_LIBKSTAT
95 static void update_kstat (void)
96 {
97 if (kc == NULL)
98 {
99 if ((kc = kstat_open ()) == NULL)
100 syslog (LOG_ERR, "Unable to open kstat control structure");
101 }
102 else
103 {
104 kid_t kid;
105 kid = kstat_chain_update (kc);
106 if (kid > 0)
107 {
108 syslog (LOG_INFO, "kstat chain has been updated");
109 plugin_init_all ();
110 }
111 else if (kid < 0)
112 syslog (LOG_ERR, "kstat chain update failed");
113 /* else: everything works as expected */
114 }
116 return;
117 } /* static void update_kstat (void) */
118 #endif /* HAVE_LIBKSTAT */
120 /* TODO
121 * Remove all settings but `-f' and `-C'
122 */
123 static void exit_usage (char *name)
124 {
125 printf ("Usage: "PACKAGE" [OPTIONS]\n\n"
127 "Available options:\n"
128 " General:\n"
129 " -C <file> Configuration file.\n"
130 " Default: "CONFIGFILE"\n"
131 #if COLLECT_DAEMON
132 " -f Don't fork to the background.\n"
133 #endif
134 "\nBuiltin defaults:\n"
135 " Config-File "CONFIGFILE"\n"
136 " PID-File "PIDFILE"\n"
137 " Data-Directory "PKGLOCALSTATEDIR"\n"
138 #if COLLECT_DEBUG
139 " Log-File "LOGFILE"\n"
140 #endif
141 " Step "COLLECTD_STEP" seconds\n"
142 " Heartbeat "COLLECTD_HEARTBEAT" seconds\n"
143 "\n"PACKAGE" "VERSION", http://verplant.org/collectd/\n"
144 "by Florian octo Forster <octo@verplant.org>\n"
145 "for contributions see `AUTHORS'\n");
146 exit (0);
147 } /* static void exit_usage (char *name) */
149 static int start_client (void)
150 {
151 int step;
153 struct timeval tv_now;
154 struct timeval tv_next;
155 struct timespec ts_wait;
157 step = atoi (COLLECTD_STEP);
158 if (step <= 0)
159 step = 10;
161 #if HAVE_LIBKSTAT
162 kc = NULL;
163 update_kstat ();
164 #endif
166 #if HAVE_LIBSTATGRAB
167 if (sg_init ())
168 {
169 syslog (LOG_ERR, "sg_init: %s", sg_str_error (sg_get_error ()));
170 return (-1);
171 }
173 if (sg_drop_privileges ())
174 {
175 syslog (LOG_ERR, "sg_drop_privileges: %s", sg_str_error (sg_get_error ()));
176 return (-1);
177 }
178 #endif
180 plugin_init_all ();
182 while (loop == 0)
183 {
184 if (gettimeofday (&tv_next, NULL) < 0)
185 {
186 syslog (LOG_ERR, "gettimeofday failed: %s", strerror (errno));
187 return (-1);
188 }
189 tv_next.tv_sec += step;
191 #if HAVE_LIBKSTAT
192 update_kstat ();
193 #endif
194 /* `curtime' is used by many (all?) plugins as the
195 * data-sample-time passed to RRDTool */
196 curtime = time (NULL);
198 /* Issue all plugins */
199 plugin_read_all ();
201 if (gettimeofday (&tv_now, NULL) < 0)
202 {
203 syslog (LOG_ERR, "gettimeofday failed: %s", strerror (errno));
204 return (-1);
205 }
207 if (timeval_sub_timespec (&tv_next, &tv_now, &ts_wait) != 0)
208 {
209 syslog (LOG_WARNING, "No sleeping because `timeval_sub_timespec' returned non-zero!");
210 continue;
211 }
213 while (nanosleep (&ts_wait, &ts_wait) == -1)
214 {
215 if (errno != EINTR)
216 {
217 syslog (LOG_ERR, "nanosleep failed: %s", strerror (errno));
218 break;
219 }
220 }
221 }
223 return (0);
224 } /* static int start_client (void) */
226 #if HAVE_LIBRRD
227 static int start_server (void)
228 {
229 /* FIXME use stack here! */
230 char *host;
231 char *type;
232 char *instance;
233 char *values;
235 while (loop == 0)
236 {
237 if (network_receive (&host, &type, &instance, &values) == 0)
238 plugin_write (host, type, instance, values);
240 if (host != NULL) free (host); host = NULL;
241 if (type != NULL) free (type); type = NULL;
242 if (instance != NULL) free (instance); instance = NULL;
243 if (values != NULL) free (values); values = NULL;
244 }
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, "%d\n", 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 = PIDFILE;
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 #endif
301 /* open syslog */
302 openlog (PACKAGE, LOG_CONS | LOG_PID, LOG_DAEMON);
304 /* read options */
305 while (1)
306 {
307 int c;
309 c = getopt (argc, argv, "hC:"
310 #if COLLECT_DAEMON
311 "f"
312 #endif
313 );
315 if (c == -1)
316 break;
318 switch (c)
319 {
320 case 'C':
321 configfile = optarg;
322 break;
323 #if COLLECT_DAEMON
324 case 'f':
325 daemonize = 0;
326 break;
327 #endif /* COLLECT_DAEMON */
328 case 'h':
329 default:
330 exit_usage (argv[0]);
331 } /* switch (c) */
332 } /* while (1) */
334 #if COLLECT_DEBUG
335 if ((logfile = cf_get_option ("LogFile", LOGFILE)) != NULL)
336 DBG_STARTFILE (logfile, "Debug file opened.");
337 #endif
339 /*
340 * Read options from the config file, the environment and the command
341 * line (in that order, with later options overwriting previous ones in
342 * general).
343 * Also, this will automatically load modules.
344 */
345 if (cf_read (configfile))
346 {
347 fprintf (stderr, "Error: Reading the config file failed!\n"
348 "Read the syslog for details.\n");
349 return (1);
350 }
352 /*
353 * Change directory. We do this _after_ reading the config and loading
354 * modules to relative paths work as expected.
355 */
356 if ((datadir = cf_get_option ("DataDir", PKGLOCALSTATEDIR)) == NULL)
357 {
358 fprintf (stderr, "Don't have a datadir to use. This should not happen. Ever.");
359 return (1);
360 }
361 if (change_basedir (datadir))
362 {
363 fprintf (stderr, "Error: Unable to change to directory `%s'.\n", datadir);
364 return (1);
365 }
367 #if COLLECT_DAEMON
368 /*
369 * fork off child
370 */
371 sigChldAction.sa_handler = SIG_IGN;
372 sigaction (SIGCHLD, &sigChldAction, NULL);
374 if ((pidfile = cf_get_option ("PIDFile", PIDFILE)) == NULL)
375 {
376 fprintf (stderr, "Cannot obtain pidfile. This shoud not happen. Ever.");
377 return (1);
378 }
380 if (daemonize)
381 {
382 if ((pid = fork ()) == -1)
383 {
384 /* error */
385 fprintf (stderr, "fork: %s", strerror (errno));
386 return (1);
387 }
388 else if (pid != 0)
389 {
390 /* parent */
391 /* printf ("Running (PID %i)\n", pid); */
392 return (0);
393 }
395 /* Detach from session */
396 setsid ();
398 /* Write pidfile */
399 if (pidfile_create (pidfile))
400 exit (2);
402 /* close standard descriptors */
403 close (2);
404 close (1);
405 close (0);
407 if (open ("/dev/null", O_RDWR) != 0)
408 {
409 syslog (LOG_ERR, "Error: Could not connect `STDIN' to `/dev/null'");
410 return (1);
411 }
412 if (dup (0) != 1)
413 {
414 syslog (LOG_ERR, "Error: Could not connect `STDOUT' to `/dev/null'");
415 return (1);
416 }
417 if (dup (0) != 2)
418 {
419 syslog (LOG_ERR, "Error: Could not connect `STDERR' to `/dev/null'");
420 return (1);
421 }
422 } /* if (daemonize) */
423 #endif /* COLLECT_DAEMON */
425 /*
426 * install signal handlers
427 */
428 sigIntAction.sa_handler = sigIntHandler;
429 sigaction (SIGINT, &sigIntAction, NULL);
431 sigTermAction.sa_handler = sigTermHandler;
432 sigaction (SIGTERM, &sigTermAction, NULL);
434 /*
435 * run the actual loops
436 */
437 #if HAVE_LIBRRD
438 if (operating_mode == MODE_SERVER)
439 start_server ();
440 else /* if (operating_mode == MODE_CLIENT || operating_mode == MODE_LOCAL) */
441 #endif
442 start_client ();
444 #if COLLECT_DEBUG
445 if (logfile != NULL)
446 DBG_STOPFILE("debug file closed.");
447 #endif
449 /* close syslog */
450 syslog (LOG_INFO, "Exiting normally");
451 closelog ();
453 #if COLLECT_DAEMON
454 if (daemonize)
455 pidfile_remove (pidfile);
456 #endif /* COLLECT_DAEMON */
458 return (0);
459 } /* int main (int argc, char **argv) */