2f05b93f0caaef3c60b2b8504e878ff582211b0d
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"
26 #include "multicast.h"
27 #include "plugin.h"
29 #include "ping.h"
31 static int loop = 0;
33 #ifdef HAVE_LIBKSTAT
34 kstat_ctl_t *kc;
35 #endif /* HAVE_LIBKSTAT */
37 #if COLLECT_PING
38 char *pinghosts[MAX_PINGHOSTS];
39 int num_pinghosts = 0;
40 #endif
42 /*
43 * exported variables
44 */
45 time_t curtime;
47 #ifdef HAVE_LIBRRD
48 int operating_mode;
49 #endif
51 void sigIntHandler (int signal)
52 {
53 loop++;
54 }
56 int change_basedir (char *dir)
57 {
58 int dirlen = strlen (dir);
60 while ((dirlen > 0) && (dir[dirlen - 1] == '/'))
61 dir[--dirlen] = '\0';
63 if (dirlen <= 0)
64 return (-1);
66 if (chdir (dir) == -1)
67 {
68 if (errno == ENOENT)
69 {
70 if (mkdir (dir, 0755) == -1)
71 {
72 syslog (LOG_ERR, "mkdir: %s", strerror (errno));
73 return (-1);
74 }
75 else if (chdir (dir) == -1)
76 {
77 syslog (LOG_ERR, "chdir: %s", strerror (errno));
78 return (-1);
79 }
80 }
81 else
82 {
83 syslog (LOG_ERR, "chdir: %s", strerror (errno));
84 return (-1);
85 }
86 }
88 return (0);
89 }
91 #ifdef HAVE_LIBKSTAT
92 void update_kstat (void)
93 {
94 if (kc == NULL)
95 {
96 if ((kc = kstat_open ()) == NULL)
97 syslog (LOG_ERR, "Unable to open kstat control structure");
98 }
99 else
100 {
101 kid_t kid;
102 kid = kstat_chain_update (kc);
103 if (kid > 0)
104 {
105 syslog (LOG_INFO, "kstat chain has been updated");
106 plugin_init_all ();
107 }
108 else if (kid < 0)
109 syslog (LOG_ERR, "kstat chain update failed");
110 /* else: everything works as expected */
111 }
113 return;
114 }
115 #endif /* HAVE_LIBKSTAT */
117 void exit_usage (char *name)
118 {
119 printf ("Usage: %s [OPTIONS]\n\n"
121 "Available options:\n"
122 " General:\n"
123 /*
124 " -C <dir> Configuration file.\n"
125 " Default: %s\n"
126 */
127 " -P <file> PID File.\n"
128 " Default: %s\n"
129 " -M <dir> Module/Plugin directory.\n"
130 " Default: %s\n"
131 " -D <dir> Data storage directory.\n"
132 " Default: %s\n"
133 " -f Don't fork to the background.\n"
134 #ifdef HAVE_LIBRRD
135 " -l Start in local mode (no network).\n"
136 " -c Start in client (sender) mode.\n"
137 " -s Start in server (listener) mode.\n"
138 #endif /* HAVE_LIBRRD */
139 #if COLLECT_PING
140 " Ping:\n"
141 " -p <host> Host to ping periodically, may be repeated to ping\n"
142 " more than one host.\n"
143 #endif /* COLLECT_PING */
144 "\n%s %s, http://verplant.org/collectd/\n"
145 "by Florian octo Forster <octo@verplant.org>\n"
146 "for contributions see `AUTHORS'\n",
147 PACKAGE, CONFIGFILE, PIDFILE, PLUGINDIR, PKGLOCALSTATEDIR, PACKAGE, VERSION);
148 exit (0);
149 }
151 int start_client (void)
152 {
153 int sleepingtime;
155 #ifdef HAVE_LIBKSTAT
156 kc = NULL;
157 update_kstat ();
158 #endif
160 #ifdef HAVE_LIBSTATGRAB
161 if (sg_init ())
162 {
163 syslog (LOG_ERR, "sg_init: %s", sg_str_error (sg_get_error ()));
164 return (-1);
165 }
167 if (sg_drop_privileges ())
168 {
169 syslog (LOG_ERR, "sg_drop_privileges: %s", sg_str_error (sg_get_error ()));
170 return (-1);
171 }
172 #endif
174 plugin_init_all ();
176 while (loop == 0)
177 {
178 curtime = time (NULL);
179 #ifdef HAVE_LIBKSTAT
180 update_kstat ();
181 #endif
182 plugin_read_all ();
184 sleepingtime = 10;
185 while (sleepingtime != 0)
186 {
187 if (loop != 0)
188 break;
189 sleepingtime = sleep (sleepingtime);
190 }
191 }
193 return (0);
194 }
196 #ifdef HAVE_LIBRRD
197 int start_server (void)
198 {
199 char *host;
200 char *type;
201 char *instance;
202 char *values;
204 while (loop == 0)
205 {
206 if (multicast_receive (&host, &type, &instance, &values) == 0)
207 plugin_write (host, type, instance, values);
209 if (host != NULL) free (host); host = NULL;
210 if (type != NULL) free (type); type = NULL;
211 if (instance != NULL) free (instance); instance = NULL;
212 if (values != NULL) free (values); values = NULL;
213 }
215 return (0);
216 }
217 #endif /* HAVE_LIBRRD */
219 int pidfile_create (void)
220 {
221 FILE *fh;
223 if ((fh = fopen (PIDFILE, "w")) == NULL)
224 {
225 syslog (LOG_ERR, "fopen (pidfile): %s", strerror (errno));
226 return (1);
227 }
229 fprintf (fh, "%d\n", getpid());
230 fclose(fh);
232 return (0);
233 }
235 int pidfile_remove (void)
236 {
237 return (unlink (PIDFILE));
238 }
240 int main (int argc, char **argv)
241 {
242 struct sigaction sigIntAction, sigChldAction;
243 #if COLLECT_DAEMON
244 pid_t pid;
245 #endif
247 char *configfile = CONFIGFILE;
248 char *pidfile = PIDFILE;
249 char *plugindir = PLUGINDIR;
250 char *datadir = PKGLOCALSTATEDIR;
252 int daemonize = 1;
254 #ifdef HAVE_LIBRRD
255 operating_mode = MODE_LOCAL;
256 #endif
258 /* open syslog */
259 openlog (PACKAGE, LOG_CONS | LOG_PID, LOG_DAEMON);
261 /* read options */
262 while (1)
263 {
264 int c;
266 c = getopt (argc, argv, "C:P:M:D:fh"
267 #if HAVE_LIBRRD
268 "csl"
269 #endif /* HAVE_LIBRRD */
270 #if COLLECT_PING
271 "p:"
272 #endif /* COLLECT_PING */
273 );
275 if (c == -1)
276 break;
278 switch (c)
279 {
280 #ifdef HAVE_LIBRRD
281 case 'c':
282 operating_mode = MODE_CLIENT;
283 break;
285 case 's':
286 operating_mode = MODE_SERVER;
287 break;
289 case 'l':
290 operating_mode = MODE_LOCAL;
291 break;
292 #endif /* HAVE_LIBRRD */
293 case 'C':
294 configfile = optarg;
295 break;
296 case 'P':
297 pidfile = optarg;
298 break;
299 case 'M':
300 plugindir = optarg;
301 break;
302 case 'D':
303 datadir = optarg;
304 break;
305 case 'f':
306 daemonize = 0;
307 break;
308 #if COLLECT_PING
309 case 'p':
310 if (num_pinghosts < MAX_PINGHOSTS)
311 pinghosts[num_pinghosts++] = optarg;
312 else
313 fprintf (stderr, "Maximum of %i ping hosts reached.\n", MAX_PINGHOSTS);
314 break;
315 #endif /* COLLECT_PING */
316 case 'h':
317 default:
318 exit_usage (argv[0]);
319 }
321 }
323 /*
324 * Load plugins and change to output directory
325 * Loading plugins is done first so relative paths work as expected..
326 */
327 if (plugin_load_all (plugindir) < 1)
328 {
329 fprintf (stderr, "Error: No plugins found.\n");
330 return (1);
331 }
333 if (change_basedir (datadir))
334 {
335 fprintf (stderr, "Error: Unable to change to directory `%s'.\n", datadir);
336 return (1);
337 }
339 /*
340 * install signal handlers
341 */
342 sigIntAction.sa_handler = sigIntHandler;
343 sigaction (SIGINT, &sigIntAction, NULL);
345 sigChldAction.sa_handler = SIG_IGN;
346 sigaction (SIGCHLD, &sigChldAction, NULL);
348 /*
349 * fork off child
350 */
351 #if COLLECT_DAEMON
352 if (daemonize)
353 {
354 if ((pid = fork ()) == -1)
355 {
356 /* error */
357 fprintf (stderr, "fork: %s", strerror (errno));
358 return (1);
359 }
360 else if (pid != 0)
361 {
362 /* parent */
363 /* printf ("Running (PID %i)\n", pid); */
364 return (0);
365 }
367 /* Detach from session */
368 setsid ();
370 /* Write pidfile */
371 if (pidfile_create ())
372 exit (2);
374 /* close standard descriptors */
375 close (2);
376 close (1);
377 close (0);
379 if (open ("/dev/null", O_RDWR) != 0)
380 {
381 syslog (LOG_ERR, "Error: Could not connect `STDIN' to `/dev/null'");
382 return (1);
383 }
384 if (dup (0) != 1)
385 {
386 syslog (LOG_ERR, "Error: Could not connect `STDOUT' to `/dev/null'");
387 return (1);
388 }
389 if (dup (0) != 2)
390 {
391 syslog (LOG_ERR, "Error: Could not connect `STDERR' to `/dev/null'");
392 return (1);
393 }
394 } /* if (daemonize) */
395 #endif /* COLLECT_DAEMON */
397 /*
398 * run the actual loops
399 */
400 #ifdef HAVE_LIBRRD
401 if (operating_mode == MODE_SERVER)
402 start_server ();
403 else /* if (operating_mode == MODE_CLIENT || operating_mode == MODE_LOCAL) */
404 #endif
405 start_client ();
407 /* close syslog */
408 syslog (LOG_INFO, "Exiting normally");
409 closelog ();
411 if (daemonize)
412 pidfile_remove();
414 return (0);
415 }