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 /* TODO
126 * Remove all settings but `-f' and `-C'
127 */
128 static void exit_usage (char *name)
129 {
130 printf ("Usage: "PACKAGE" [OPTIONS]\n\n"
132 "Available options:\n"
133 " General:\n"
134 " -C <file> Configuration file.\n"
135 " Default: "CONFIGFILE"\n"
136 #if COLLECT_DAEMON
137 " -f Don't fork to the background.\n"
138 #endif
139 "\n"PACKAGE" "VERSION", http://verplant.org/collectd/\n"
140 "by Florian octo Forster <octo@verplant.org>\n"
141 "for contributions see `AUTHORS'\n");
142 exit (0);
143 } /* static void exit_usage (char *name) */
145 static int start_client (void)
146 {
147 int sleepingtime;
149 #if HAVE_LIBKSTAT
150 kc = NULL;
151 update_kstat ();
152 #endif
154 #if HAVE_LIBSTATGRAB
155 if (sg_init ())
156 {
157 syslog (LOG_ERR, "sg_init: %s", sg_str_error (sg_get_error ()));
158 return (-1);
159 }
161 if (sg_drop_privileges ())
162 {
163 syslog (LOG_ERR, "sg_drop_privileges: %s", sg_str_error (sg_get_error ()));
164 return (-1);
165 }
166 #endif
168 plugin_init_all ();
170 while (loop == 0)
171 {
172 curtime = time (NULL);
173 #if HAVE_LIBKSTAT
174 update_kstat ();
175 #endif
176 plugin_read_all ();
178 sleepingtime = 10;
179 while (sleepingtime != 0)
180 {
181 if (loop != 0)
182 break;
183 sleepingtime = sleep (sleepingtime);
184 }
185 }
187 return (0);
188 } /* static int start_client (void) */
190 #if HAVE_LIBRRD
191 static int start_server (void)
192 {
193 char *host;
194 char *type;
195 char *instance;
196 char *values;
198 while (loop == 0)
199 {
200 if (multicast_receive (&host, &type, &instance, &values) == 0)
201 plugin_write (host, type, instance, values);
203 if (host != NULL) free (host); host = NULL;
204 if (type != NULL) free (type); type = NULL;
205 if (instance != NULL) free (instance); instance = NULL;
206 if (values != NULL) free (values); values = NULL;
207 }
209 return (0);
210 } /* static int start_server (void) */
211 #endif /* HAVE_LIBRRD */
213 #if COLLECT_DAEMON
214 static int pidfile_create (const char *file)
215 {
216 FILE *fh;
218 if (file == NULL)
219 file = PIDFILE;
221 if ((fh = fopen (file, "w")) == NULL)
222 {
223 syslog (LOG_ERR, "fopen (%s): %s", file, strerror (errno));
224 return (1);
225 }
227 fprintf (fh, "%d\n", getpid());
228 fclose(fh);
230 return (0);
231 } /* static int pidfile_create (const char *file) */
232 #endif /* COLLECT_DAEMON */
234 #if COLLECT_DAEMON
235 static int pidfile_remove (const char *file)
236 {
237 if (file == NULL) {
238 file = PIDFILE;
239 }
240 return (unlink (file));
241 } /* static int pidfile_remove (const char *file) */
242 #endif /* COLLECT_DAEMON */
244 int main (int argc, char **argv)
245 {
246 struct sigaction sigIntAction;
247 struct sigaction sigTermAction;
248 char *datadir = PKGLOCALSTATEDIR;
249 char *configfile = CONFIGFILE;
250 #if COLLECT_DAEMON
251 struct sigaction sigChldAction;
252 char *pidfile = PIDFILE;
253 pid_t pid;
254 int daemonize = 1;
255 #endif
256 #if COLLECT_DEBUG
257 char *logfile = LOGFILE;
258 #endif
260 #if HAVE_LIBRRD
261 operating_mode = MODE_LOCAL;
262 #endif
264 /* open syslog */
265 openlog (PACKAGE, LOG_CONS | LOG_PID, LOG_DAEMON);
267 /* read options */
268 while (1)
269 {
270 int c;
272 /* FIXME */
273 c = getopt (argc, argv, "C:"
274 #if COLLECT_DAEMON
275 "f"
276 #endif
277 );
279 if (c == -1)
280 break;
282 switch (c)
283 {
284 case 'C':
285 configfile = optarg;
286 break;
287 #if COLLECT_DAEMON
288 case 'f':
289 daemonize = 0;
290 break;
291 #endif /* COLLECT_DAEMON */
292 case 'h':
293 default:
294 exit_usage (argv[0]);
295 } /* switch (c) */
296 } /* while (1) */
298 #if COLLECT_DEBUG
299 if ((logfile = cf_get_option ("LogFile", LOGFILE)) != NULL)
300 DBG_STARTFILE (logfile, "Debug file opened.");
301 #endif
303 /*
304 * Read options from the config file, the environment and the command
305 * line (in that order, with later options overwriting previous ones in
306 * general).
307 * Also, this will automatically load modules.
308 */
309 if (cf_read (configfile))
310 {
311 fprintf (stderr, "Error: Reading the config file failed!\n"
312 "Read the syslog for details.\n");
313 return (1);
314 }
316 /*
317 * Change directory. We do this _after_ reading the config and loading
318 * modules to relative paths work as expected.
319 */
320 if ((datadir = cf_get_option ("DataDir", PKGLOCALSTATEDIR)) == NULL)
321 {
322 fprintf (stderr, "Don't have a datadir to use. This should not happen. Ever.");
323 return (1);
324 }
325 if (change_basedir (datadir))
326 {
327 fprintf (stderr, "Error: Unable to change to directory `%s'.\n", datadir);
328 return (1);
329 }
331 #if COLLECT_DAEMON
332 /*
333 * fork off child
334 */
335 sigChldAction.sa_handler = SIG_IGN;
336 sigaction (SIGCHLD, &sigChldAction, NULL);
338 if ((pidfile = cf_get_option ("PIDFile", PIDFILE)) == NULL)
339 {
340 fprintf (stderr, "Cannot obtain pidfile. This shoud not happen. Ever.");
341 return (1);
342 }
344 if (daemonize)
345 {
346 if ((pid = fork ()) == -1)
347 {
348 /* error */
349 fprintf (stderr, "fork: %s", strerror (errno));
350 return (1);
351 }
352 else if (pid != 0)
353 {
354 /* parent */
355 /* printf ("Running (PID %i)\n", pid); */
356 return (0);
357 }
359 /* Detach from session */
360 setsid ();
362 /* Write pidfile */
363 if (pidfile_create (pidfile))
364 exit (2);
366 /* close standard descriptors */
367 close (2);
368 close (1);
369 close (0);
371 if (open ("/dev/null", O_RDWR) != 0)
372 {
373 syslog (LOG_ERR, "Error: Could not connect `STDIN' to `/dev/null'");
374 return (1);
375 }
376 if (dup (0) != 1)
377 {
378 syslog (LOG_ERR, "Error: Could not connect `STDOUT' to `/dev/null'");
379 return (1);
380 }
381 if (dup (0) != 2)
382 {
383 syslog (LOG_ERR, "Error: Could not connect `STDERR' to `/dev/null'");
384 return (1);
385 }
386 } /* if (daemonize) */
387 #endif /* COLLECT_DAEMON */
389 /*
390 * install signal handlers
391 */
392 sigIntAction.sa_handler = sigIntHandler;
393 sigaction (SIGINT, &sigIntAction, NULL);
395 sigTermAction.sa_handler = sigTermHandler;
396 sigaction (SIGTERM, &sigTermAction, NULL);
398 /*
399 * run the actual loops
400 */
401 #if HAVE_LIBRRD
402 if (operating_mode == MODE_SERVER)
403 start_server ();
404 else /* if (operating_mode == MODE_CLIENT || operating_mode == MODE_LOCAL) */
405 #endif
406 start_client ();
408 #if COLLECT_DEBUG
409 if (logfile != NULL)
410 DBG_STOPFILE("debug file closed.");
411 #endif
413 /* close syslog */
414 syslog (LOG_INFO, "Exiting normally");
415 closelog ();
417 #if COLLECT_DAEMON
418 if (daemonize)
419 pidfile_remove (pidfile);
420 #endif /* COLLECT_DAEMON */
422 return (0);
423 } /* int main (int argc, char **argv) */