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 /*
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 "\n"PACKAGE" "VERSION", http://verplant.org/collectd/\n"
142 "by Florian octo Forster <octo@verplant.org>\n"
143 "for contributions see `AUTHORS'\n");
144 exit (0);
145 } /* static void exit_usage (char *name) */
147 static int start_client (void)
148 {
149 int sleepingtime;
151 #if HAVE_LIBKSTAT
152 kc = NULL;
153 update_kstat ();
154 #endif
156 #if HAVE_LIBSTATGRAB
157 if (sg_init ())
158 {
159 syslog (LOG_ERR, "sg_init: %s", sg_str_error (sg_get_error ()));
160 return (-1);
161 }
163 if (sg_drop_privileges ())
164 {
165 syslog (LOG_ERR, "sg_drop_privileges: %s", sg_str_error (sg_get_error ()));
166 return (-1);
167 }
168 #endif
170 plugin_init_all ();
172 while (loop == 0)
173 {
174 curtime = time (NULL);
175 #if HAVE_LIBKSTAT
176 update_kstat ();
177 #endif
178 plugin_read_all ();
180 sleepingtime = 10;
181 while (sleepingtime != 0)
182 {
183 if (loop != 0)
184 break;
185 sleepingtime = sleep (sleepingtime);
186 }
187 }
189 return (0);
190 } /* static int start_client (void) */
192 #if HAVE_LIBRRD
193 static int start_server (void)
194 {
195 char *host;
196 char *type;
197 char *instance;
198 char *values;
200 while (loop == 0)
201 {
202 if (multicast_receive (&host, &type, &instance, &values) == 0)
203 plugin_write (host, type, instance, values);
205 if (host != NULL) free (host); host = NULL;
206 if (type != NULL) free (type); type = NULL;
207 if (instance != NULL) free (instance); instance = NULL;
208 if (values != NULL) free (values); values = NULL;
209 }
211 return (0);
212 } /* static int start_server (void) */
213 #endif /* HAVE_LIBRRD */
215 #if COLLECT_DAEMON
216 static int pidfile_create (const char *file)
217 {
218 FILE *fh;
220 if (file == NULL)
221 file = PIDFILE;
223 if ((fh = fopen (file, "w")) == NULL)
224 {
225 syslog (LOG_ERR, "fopen (%s): %s", file, strerror (errno));
226 return (1);
227 }
229 fprintf (fh, "%d\n", getpid());
230 fclose(fh);
232 return (0);
233 } /* static int pidfile_create (const char *file) */
234 #endif /* COLLECT_DAEMON */
236 #if COLLECT_DAEMON
237 static int pidfile_remove (const char *file)
238 {
239 if (file == NULL) {
240 file = PIDFILE;
241 }
242 return (unlink (file));
243 } /* static int pidfile_remove (const char *file) */
244 #endif /* COLLECT_DAEMON */
246 int main (int argc, char **argv)
247 {
248 struct sigaction sigIntAction;
249 struct sigaction sigTermAction;
250 char *datadir = PKGLOCALSTATEDIR;
251 char *configfile = CONFIGFILE;
252 #if COLLECT_DAEMON
253 struct sigaction sigChldAction;
254 char *pidfile = PIDFILE;
255 pid_t pid;
256 int daemonize = 1;
257 #endif
258 #if COLLECT_DEBUG
259 char *logfile = LOGFILE;
260 #endif
262 #if HAVE_LIBRRD
263 operating_mode = MODE_LOCAL;
264 #endif
266 /* open syslog */
267 openlog (PACKAGE, LOG_CONS | LOG_PID, LOG_DAEMON);
269 /* read options */
270 while (1)
271 {
272 int c;
274 c = getopt (argc, argv, "hC:"
275 #if COLLECT_DAEMON
276 "f"
277 #endif
278 );
280 if (c == -1)
281 break;
283 switch (c)
284 {
285 case 'C':
286 configfile = optarg;
287 break;
288 #if COLLECT_DAEMON
289 case 'f':
290 daemonize = 0;
291 break;
292 #endif /* COLLECT_DAEMON */
293 case 'h':
294 default:
295 exit_usage (argv[0]);
296 } /* switch (c) */
297 } /* while (1) */
299 #if COLLECT_DEBUG
300 if ((logfile = cf_get_option ("LogFile", LOGFILE)) != NULL)
301 DBG_STARTFILE (logfile, "Debug file opened.");
302 #endif
304 /*
305 * Read options from the config file, the environment and the command
306 * line (in that order, with later options overwriting previous ones in
307 * general).
308 * Also, this will automatically load modules.
309 */
310 if (cf_read (configfile))
311 {
312 fprintf (stderr, "Error: Reading the config file failed!\n"
313 "Read the syslog for details.\n");
314 return (1);
315 }
317 /*
318 * Change directory. We do this _after_ reading the config and loading
319 * modules to relative paths work as expected.
320 */
321 if ((datadir = cf_get_option ("DataDir", PKGLOCALSTATEDIR)) == NULL)
322 {
323 fprintf (stderr, "Don't have a datadir to use. This should not happen. Ever.");
324 return (1);
325 }
326 if (change_basedir (datadir))
327 {
328 fprintf (stderr, "Error: Unable to change to directory `%s'.\n", datadir);
329 return (1);
330 }
332 #if COLLECT_DAEMON
333 /*
334 * fork off child
335 */
336 sigChldAction.sa_handler = SIG_IGN;
337 sigaction (SIGCHLD, &sigChldAction, NULL);
339 if ((pidfile = cf_get_option ("PIDFile", PIDFILE)) == NULL)
340 {
341 fprintf (stderr, "Cannot obtain pidfile. This shoud not happen. Ever.");
342 return (1);
343 }
345 if (daemonize)
346 {
347 if ((pid = fork ()) == -1)
348 {
349 /* error */
350 fprintf (stderr, "fork: %s", strerror (errno));
351 return (1);
352 }
353 else if (pid != 0)
354 {
355 /* parent */
356 /* printf ("Running (PID %i)\n", pid); */
357 return (0);
358 }
360 /* Detach from session */
361 setsid ();
363 /* Write pidfile */
364 if (pidfile_create (pidfile))
365 exit (2);
367 /* close standard descriptors */
368 close (2);
369 close (1);
370 close (0);
372 if (open ("/dev/null", O_RDWR) != 0)
373 {
374 syslog (LOG_ERR, "Error: Could not connect `STDIN' to `/dev/null'");
375 return (1);
376 }
377 if (dup (0) != 1)
378 {
379 syslog (LOG_ERR, "Error: Could not connect `STDOUT' to `/dev/null'");
380 return (1);
381 }
382 if (dup (0) != 2)
383 {
384 syslog (LOG_ERR, "Error: Could not connect `STDERR' to `/dev/null'");
385 return (1);
386 }
387 } /* if (daemonize) */
388 #endif /* COLLECT_DAEMON */
390 /*
391 * install signal handlers
392 */
393 sigIntAction.sa_handler = sigIntHandler;
394 sigaction (SIGINT, &sigIntAction, NULL);
396 sigTermAction.sa_handler = sigTermHandler;
397 sigaction (SIGTERM, &sigTermAction, NULL);
399 /*
400 * run the actual loops
401 */
402 #if HAVE_LIBRRD
403 if (operating_mode == MODE_SERVER)
404 start_server ();
405 else /* if (operating_mode == MODE_CLIENT || operating_mode == MODE_LOCAL) */
406 #endif
407 start_client ();
409 #if COLLECT_DEBUG
410 if (logfile != NULL)
411 DBG_STOPFILE("debug file closed.");
412 #endif
414 /* close syslog */
415 syslog (LOG_INFO, "Exiting normally");
416 closelog ();
418 #if COLLECT_DAEMON
419 if (daemonize)
420 pidfile_remove (pidfile);
421 #endif /* COLLECT_DAEMON */
423 return (0);
424 } /* int main (int argc, char **argv) */