a9b1ac80d847834bfff7836f2ca721ffb80ac5e7
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 "multicast.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 #if COLLECT_PING
41 char *pinghosts[MAX_PINGHOSTS];
42 int num_pinghosts = 0;
43 #endif
45 /*
46 * exported variables
47 */
48 time_t curtime;
50 #if HAVE_LIBRRD
51 int operating_mode;
52 #endif
54 static void sigIntHandler (int signal)
55 {
56 loop++;
57 }
59 static void sigTermHandler (int signal)
60 {
61 loop++;
62 }
64 static int change_basedir (char *dir)
65 {
66 int dirlen = strlen (dir);
68 while ((dirlen > 0) && (dir[dirlen - 1] == '/'))
69 dir[--dirlen] = '\0';
71 if (dirlen <= 0)
72 return (-1);
74 if (chdir (dir) == -1)
75 {
76 if (errno == ENOENT)
77 {
78 if (mkdir (dir, 0755) == -1)
79 {
80 syslog (LOG_ERR, "mkdir (%s): %s", dir, strerror (errno));
81 return (-1);
82 }
83 else if (chdir (dir) == -1)
84 {
85 syslog (LOG_ERR, "chdir (%s): %s", dir, strerror (errno));
86 return (-1);
87 }
88 }
89 else
90 {
91 syslog (LOG_ERR, "chdir: %s", strerror (errno));
92 return (-1);
93 }
94 }
96 return (0);
97 } /* static int change_basedir (char *dir) */
99 #if HAVE_LIBKSTAT
100 static void update_kstat (void)
101 {
102 if (kc == NULL)
103 {
104 if ((kc = kstat_open ()) == NULL)
105 syslog (LOG_ERR, "Unable to open kstat control structure");
106 }
107 else
108 {
109 kid_t kid;
110 kid = kstat_chain_update (kc);
111 if (kid > 0)
112 {
113 syslog (LOG_INFO, "kstat chain has been updated");
114 plugin_init_all ();
115 }
116 else if (kid < 0)
117 syslog (LOG_ERR, "kstat chain update failed");
118 /* else: everything works as expected */
119 }
121 return;
122 } /* static void update_kstat (void) */
123 #endif /* HAVE_LIBKSTAT */
125 static void exit_usage (char *name)
126 {
127 printf ("Usage: "PACKAGE" [OPTIONS]\n\n"
129 "Available options:\n"
130 " General:\n"
131 " -C <file> Configuration file.\n"
132 " Default: "CONFIGFILE"\n"
133 #if COLLECT_DAEMON
134 " -P <file> PID file.\n"
135 " Default: "PIDFILE"\n"
136 #endif
137 " -M <dir> Module/Plugin directory.\n"
138 " Default: "PLUGINDIR"\n"
139 " -D <dir> Data storage directory.\n"
140 " Default: "PKGLOCALSTATEDIR"\n"
141 #if COLLECT_DEBUG
142 " -L <file> Log file.\n"
143 " Default: "LOGFILE"\n"
144 #endif
145 #if COLLECT_DAEMON
146 " -f Don't fork to the background.\n"
147 #endif
148 #if HAVE_LIBRRD
149 " -l Start in local mode (no network).\n"
150 " -c Start in client (sender) mode.\n"
151 " -s Start in server (listener) mode.\n"
152 #endif /* HAVE_LIBRRD */
153 #if COLLECT_PING
154 " Ping:\n"
155 " -p <host> Host to ping periodically, may be repeated to ping\n"
156 " more than one host.\n"
157 #endif /* COLLECT_PING */
158 "\n"PACKAGE" "VERSION", http://verplant.org/collectd/\n"
159 "by Florian octo Forster <octo@verplant.org>\n"
160 "for contributions see `AUTHORS'\n");
161 exit (0);
162 } /* static void exit_usage (char *name) */
164 static int start_client (void)
165 {
166 int sleepingtime;
168 #if HAVE_LIBKSTAT
169 kc = NULL;
170 update_kstat ();
171 #endif
173 #if HAVE_LIBSTATGRAB
174 if (sg_init ())
175 {
176 syslog (LOG_ERR, "sg_init: %s", sg_str_error (sg_get_error ()));
177 return (-1);
178 }
180 if (sg_drop_privileges ())
181 {
182 syslog (LOG_ERR, "sg_drop_privileges: %s", sg_str_error (sg_get_error ()));
183 return (-1);
184 }
185 #endif
187 plugin_init_all ();
189 while (loop == 0)
190 {
191 curtime = time (NULL);
192 #if HAVE_LIBKSTAT
193 update_kstat ();
194 #endif
195 plugin_read_all ();
197 sleepingtime = 10;
198 while (sleepingtime != 0)
199 {
200 if (loop != 0)
201 break;
202 sleepingtime = sleep (sleepingtime);
203 }
204 }
206 return (0);
207 } /* static int start_client (void) */
209 #if HAVE_LIBRRD
210 static int start_server (void)
211 {
212 char *host;
213 char *type;
214 char *instance;
215 char *values;
217 while (loop == 0)
218 {
219 if (multicast_receive (&host, &type, &instance, &values) == 0)
220 plugin_write (host, type, instance, values);
222 if (host != NULL) free (host); host = NULL;
223 if (type != NULL) free (type); type = NULL;
224 if (instance != NULL) free (instance); instance = NULL;
225 if (values != NULL) free (values); values = NULL;
226 }
228 return (0);
229 } /* static int start_server (void) */
230 #endif /* HAVE_LIBRRD */
232 #if COLLECT_DAEMON
233 static int pidfile_create (const char *file)
234 {
235 FILE *fh;
237 if (file == NULL)
238 file = PIDFILE;
240 if ((fh = fopen (file, "w")) == NULL)
241 {
242 syslog (LOG_ERR, "fopen (%s): %s", file, strerror (errno));
243 return (1);
244 }
246 fprintf (fh, "%d\n", getpid());
247 fclose(fh);
249 return (0);
250 } /* static int pidfile_create (const char *file) */
251 #endif /* COLLECT_DAEMON */
253 #if COLLECT_DAEMON
254 static int pidfile_remove (const char *file)
255 {
256 if (file == NULL) {
257 file = PIDFILE;
258 }
259 return (unlink (file));
260 } /* static int pidfile_remove (const char *file) */
261 #endif /* COLLECT_DAEMON */
263 int main (int argc, char **argv)
264 {
265 struct sigaction sigIntAction;
266 struct sigaction sigTermAction;
267 struct sigaction sigChldAction;
268 char *configfile = CONFIGFILE;
269 char *plugindir = PLUGINDIR;
270 char *datadir = PKGLOCALSTATEDIR;
271 #if COLLECT_DAEMON
272 char *pidfile = PIDFILE;
273 pid_t pid;
274 int daemonize = 1;
275 #endif
276 #if COLLECT_DEBUG
277 char *logfile = LOGFILE;
278 #endif
280 #if HAVE_LIBRRD
281 operating_mode = MODE_LOCAL;
282 #endif
284 /* open syslog */
285 openlog (PACKAGE, LOG_CONS | LOG_PID, LOG_DAEMON);
287 /* read options */
288 while (1)
289 {
290 int c;
292 c = getopt (argc, argv, "C:M:D:h"
293 #if COLLECT_DAEMON
294 "fP:"
295 #endif
296 #if COLLECT_DEBUG
297 "L:"
298 #endif
299 #if HAVE_LIBRRD
300 "csl"
301 #endif /* HAVE_LIBRRD */
302 #if COLLECT_PING
303 "p:"
304 #endif /* COLLECT_PING */
305 );
307 if (c == -1)
308 break;
310 switch (c)
311 {
312 #if HAVE_LIBRRD
313 case 'c':
314 operating_mode = MODE_CLIENT;
315 break;
317 case 's':
318 operating_mode = MODE_SERVER;
319 break;
321 case 'l':
322 operating_mode = MODE_LOCAL;
323 break;
324 #endif /* HAVE_LIBRRD */
325 case 'C':
326 configfile = optarg;
327 break;
328 #if COLLECT_DAEMON
329 case 'P':
330 pidfile = optarg;
331 break;
332 case 'f':
333 daemonize = 0;
334 break;
335 #endif /* COLLECT_DAEMON */
336 case 'M':
337 plugindir = optarg;
338 break;
339 case 'D':
340 datadir = optarg;
341 break;
342 #if COLLECT_DEBUG
343 case 'L':
344 logfile = optarg;
345 break;
346 #endif
347 #if COLLECT_PING
348 case 'p':
349 if (num_pinghosts < MAX_PINGHOSTS)
350 pinghosts[num_pinghosts++] = optarg;
351 else
352 fprintf (stderr, "Maximum of %i ping hosts reached.\n", MAX_PINGHOSTS);
353 break;
354 #endif /* COLLECT_PING */
355 case 'h':
356 default:
357 exit_usage (argv[0]);
358 } /* switch (c) */
359 } /* while (1) */
361 DBG_STARTFILE(logfile, "debug file opened.");
363 /*
364 * Read the config file. This will load any modules automagically.
365 */
366 plugin_set_dir (plugindir);
368 if (cf_read (configfile))
369 {
370 fprintf (stderr, "Error: Reading the config file failed!\n"
371 "Read the syslog for details.\n");
372 return (1);
373 }
375 /*
376 * Change directory. We do this _after_ reading the config and loading
377 * modules to relative paths work as expected.
378 */
379 if (change_basedir (datadir))
380 {
381 fprintf (stderr, "Error: Unable to change to directory `%s'.\n", datadir);
382 return (1);
383 }
385 /*
386 * install signal handlers
387 */
388 sigIntAction.sa_handler = sigIntHandler;
389 sigaction (SIGINT, &sigIntAction, NULL);
391 sigIntAction.sa_handler = sigTermHandler;
392 sigaction (SIGTERM, &sigTermAction, NULL);
394 sigChldAction.sa_handler = SIG_IGN;
395 sigaction (SIGCHLD, &sigChldAction, NULL);
397 /*
398 * fork off child
399 */
400 #if COLLECT_DAEMON
401 if (daemonize)
402 {
403 if ((pid = fork ()) == -1)
404 {
405 /* error */
406 fprintf (stderr, "fork: %s", strerror (errno));
407 return (1);
408 }
409 else if (pid != 0)
410 {
411 /* parent */
412 /* printf ("Running (PID %i)\n", pid); */
413 return (0);
414 }
416 /* Detach from session */
417 setsid ();
419 /* Write pidfile */
420 if (pidfile_create (pidfile))
421 exit (2);
423 /* close standard descriptors */
424 close (2);
425 close (1);
426 close (0);
428 if (open ("/dev/null", O_RDWR) != 0)
429 {
430 syslog (LOG_ERR, "Error: Could not connect `STDIN' to `/dev/null'");
431 return (1);
432 }
433 if (dup (0) != 1)
434 {
435 syslog (LOG_ERR, "Error: Could not connect `STDOUT' to `/dev/null'");
436 return (1);
437 }
438 if (dup (0) != 2)
439 {
440 syslog (LOG_ERR, "Error: Could not connect `STDERR' to `/dev/null'");
441 return (1);
442 }
443 } /* if (daemonize) */
444 #endif /* COLLECT_DAEMON */
446 /*
447 * run the actual loops
448 */
449 #if HAVE_LIBRRD
450 if (operating_mode == MODE_SERVER)
451 start_server ();
452 else /* if (operating_mode == MODE_CLIENT || operating_mode == MODE_LOCAL) */
453 #endif
454 start_client ();
456 DBG_STOPFILE("debug file closed.");
458 /* close syslog */
459 syslog (LOG_INFO, "Exiting normally");
460 closelog ();
462 #if COLLECT_DAEMON
463 if (daemonize)
464 pidfile_remove(pidfile);
465 #endif /* COLLECT_DAEMON */
467 return (0);
468 } /* int main (int argc, char **argv) */