394ac84338a0a5914c1d9b74f11e42dc9178110f
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"
28 #include "configfile.h"
30 #include "ping.h"
32 static int loop = 0;
34 #ifdef HAVE_LIBKSTAT
35 kstat_ctl_t *kc;
36 #endif /* HAVE_LIBKSTAT */
38 #if COLLECT_PING
39 char *pinghosts[MAX_PINGHOSTS];
40 int num_pinghosts = 0;
41 #endif
43 /*
44 * exported variables
45 */
46 time_t curtime;
48 #ifdef HAVE_LIBRRD
49 int operating_mode;
50 #endif
52 void sigIntHandler (int signal)
53 {
54 loop++;
55 }
57 int change_basedir (char *dir)
58 {
59 int dirlen = strlen (dir);
61 while ((dirlen > 0) && (dir[dirlen - 1] == '/'))
62 dir[--dirlen] = '\0';
64 if (dirlen <= 0)
65 return (-1);
67 if (chdir (dir) == -1)
68 {
69 if (errno == ENOENT)
70 {
71 if (mkdir (dir, 0755) == -1)
72 {
73 syslog (LOG_ERR, "mkdir (%s): %s", dir, strerror (errno));
74 return (-1);
75 }
76 else if (chdir (dir) == -1)
77 {
78 syslog (LOG_ERR, "chdir (%s): %s", dir, strerror (errno));
79 return (-1);
80 }
81 }
82 else
83 {
84 syslog (LOG_ERR, "chdir: %s", strerror (errno));
85 return (-1);
86 }
87 }
89 return (0);
90 }
92 #ifdef HAVE_LIBKSTAT
93 void update_kstat (void)
94 {
95 if (kc == NULL)
96 {
97 if ((kc = kstat_open ()) == NULL)
98 syslog (LOG_ERR, "Unable to open kstat control structure");
99 }
100 else
101 {
102 kid_t kid;
103 kid = kstat_chain_update (kc);
104 if (kid > 0)
105 {
106 syslog (LOG_INFO, "kstat chain has been updated");
107 plugin_init_all ();
108 }
109 else if (kid < 0)
110 syslog (LOG_ERR, "kstat chain update failed");
111 /* else: everything works as expected */
112 }
114 return;
115 }
116 #endif /* HAVE_LIBKSTAT */
118 void exit_usage (char *name)
119 {
120 printf ("Usage: %s [OPTIONS]\n\n"
122 "Available options:\n"
123 " General:\n"
124 " -C <dir> Configuration directory.\n"
125 " Default: %s\n"
126 " -P <file> PID File.\n"
127 " Default: %s\n"
128 " -M <dir> Module/Plugin directory.\n"
129 " Default: %s\n"
130 " -D <dir> Data storage directory.\n"
131 " Default: %s\n"
132 " -f Don't fork to the background.\n"
133 #ifdef HAVE_LIBRRD
134 " -l Start in local mode (no network).\n"
135 " -c Start in client (sender) mode.\n"
136 " -s Start in server (listener) mode.\n"
137 #endif /* HAVE_LIBRRD */
138 #if COLLECT_PING
139 " Ping:\n"
140 " -p <host> Host to ping periodically, may be repeated to ping\n"
141 " more than one host.\n"
142 #endif /* COLLECT_PING */
143 "\n%s %s, http://verplant.org/collectd/\n"
144 "by Florian octo Forster <octo@verplant.org>\n"
145 "for contributions see `AUTHORS'\n",
146 PACKAGE, SYSCONFDIR, PIDFILE, PLUGINDIR, PKGLOCALSTATEDIR, PACKAGE, VERSION);
147 exit (0);
148 }
150 int start_client (void)
151 {
152 int sleepingtime;
154 #ifdef HAVE_LIBKSTAT
155 kc = NULL;
156 update_kstat ();
157 #endif
159 #ifdef HAVE_LIBSTATGRAB
160 if (sg_init ())
161 {
162 syslog (LOG_ERR, "sg_init: %s", sg_str_error (sg_get_error ()));
163 return (-1);
164 }
166 if (sg_drop_privileges ())
167 {
168 syslog (LOG_ERR, "sg_drop_privileges: %s", sg_str_error (sg_get_error ()));
169 return (-1);
170 }
171 #endif
173 plugin_init_all ();
175 while (loop == 0)
176 {
177 curtime = time (NULL);
178 #ifdef HAVE_LIBKSTAT
179 update_kstat ();
180 #endif
181 plugin_read_all ();
183 sleepingtime = 10;
184 while (sleepingtime != 0)
185 {
186 if (loop != 0)
187 break;
188 sleepingtime = sleep (sleepingtime);
189 }
190 }
192 return (0);
193 }
195 #ifdef HAVE_LIBRRD
196 int start_server (void)
197 {
198 char *host;
199 char *type;
200 char *instance;
201 char *values;
203 while (loop == 0)
204 {
205 if (multicast_receive (&host, &type, &instance, &values) == 0)
206 plugin_write (host, type, instance, values);
208 if (host != NULL) free (host); host = NULL;
209 if (type != NULL) free (type); type = NULL;
210 if (instance != NULL) free (instance); instance = NULL;
211 if (values != NULL) free (values); values = NULL;
212 }
214 return (0);
215 }
216 #endif /* HAVE_LIBRRD */
218 int pidfile_create (void)
219 {
220 FILE *fh;
222 if ((fh = fopen (PIDFILE, "w")) == NULL)
223 {
224 syslog (LOG_ERR, "fopen (pidfile): %s", strerror (errno));
225 return (1);
226 }
228 fprintf (fh, "%d\n", getpid());
229 fclose(fh);
231 return (0);
232 }
234 int pidfile_remove (void)
235 {
236 return (unlink (PIDFILE));
237 }
239 int main (int argc, char **argv)
240 {
241 struct sigaction sigIntAction, sigChldAction;
242 #if COLLECT_DAEMON
243 pid_t pid;
244 #endif
246 char *confdir = SYSCONFDIR;
247 char *pidfile = PIDFILE;
248 char *plugindir = PLUGINDIR;
249 char *datadir = PKGLOCALSTATEDIR;
251 int daemonize = 1;
253 #ifdef HAVE_LIBRRD
254 operating_mode = MODE_LOCAL;
255 #endif
257 /* open syslog */
258 openlog (PACKAGE, LOG_CONS | LOG_PID, LOG_DAEMON);
260 /* read options */
261 while (1)
262 {
263 int c;
265 c = getopt (argc, argv, "C:P:M:D:fh"
266 #if HAVE_LIBRRD
267 "csl"
268 #endif /* HAVE_LIBRRD */
269 #if COLLECT_PING
270 "p:"
271 #endif /* COLLECT_PING */
272 );
274 if (c == -1)
275 break;
277 switch (c)
278 {
279 #ifdef HAVE_LIBRRD
280 case 'c':
281 operating_mode = MODE_CLIENT;
282 break;
284 case 's':
285 operating_mode = MODE_SERVER;
286 break;
288 case 'l':
289 operating_mode = MODE_LOCAL;
290 break;
291 #endif /* HAVE_LIBRRD */
292 case 'C':
293 confdir = optarg;
294 break;
295 case 'P':
296 pidfile = optarg;
297 break;
298 case 'M':
299 plugindir = optarg;
300 break;
301 case 'D':
302 datadir = optarg;
303 break;
304 case 'f':
305 daemonize = 0;
306 break;
307 #if COLLECT_PING
308 case 'p':
309 if (num_pinghosts < MAX_PINGHOSTS)
310 pinghosts[num_pinghosts++] = optarg;
311 else
312 fprintf (stderr, "Maximum of %i ping hosts reached.\n", MAX_PINGHOSTS);
313 break;
314 #endif /* COLLECT_PING */
315 case 'h':
316 default:
317 exit_usage (argv[0]);
318 }
320 }
322 /*
323 * Read the config file. This will load any modules automagically.
324 */
325 plugin_set_dir (plugindir);
327 if (cf_read (configfile))
328 {
329 fprintf (stderr, "Error: Reading the config file failed!\n"
330 "Read the syslog for details.\n");
331 return (1);
332 }
334 /*
335 * Change directory. We do this _after_ reading the config and loading
336 * modules to relative paths work as expected.
337 */
338 if (change_basedir (datadir))
339 {
340 fprintf (stderr, "Error: Unable to change to directory `%s'.\n", datadir);
341 return (1);
342 }
344 /*
345 * install signal handlers
346 */
347 sigIntAction.sa_handler = sigIntHandler;
348 sigaction (SIGINT, &sigIntAction, NULL);
350 sigChldAction.sa_handler = SIG_IGN;
351 sigaction (SIGCHLD, &sigChldAction, NULL);
353 /*
354 * fork off child
355 */
356 #if COLLECT_DAEMON
357 if (daemonize)
358 {
359 if ((pid = fork ()) == -1)
360 {
361 /* error */
362 fprintf (stderr, "fork: %s", strerror (errno));
363 return (1);
364 }
365 else if (pid != 0)
366 {
367 /* parent */
368 /* printf ("Running (PID %i)\n", pid); */
369 return (0);
370 }
372 /* Detach from session */
373 setsid ();
375 /* Write pidfile */
376 if (pidfile_create ())
377 exit (2);
379 /* close standard descriptors */
380 close (2);
381 close (1);
382 close (0);
384 if (open ("/dev/null", O_RDWR) != 0)
385 {
386 syslog (LOG_ERR, "Error: Could not connect `STDIN' to `/dev/null'");
387 return (1);
388 }
389 if (dup (0) != 1)
390 {
391 syslog (LOG_ERR, "Error: Could not connect `STDOUT' to `/dev/null'");
392 return (1);
393 }
394 if (dup (0) != 2)
395 {
396 syslog (LOG_ERR, "Error: Could not connect `STDERR' to `/dev/null'");
397 return (1);
398 }
399 } /* if (daemonize) */
400 #endif /* COLLECT_DAEMON */
402 /*
403 * run the actual loops
404 */
405 #ifdef HAVE_LIBRRD
406 if (operating_mode == MODE_SERVER)
407 start_server ();
408 else /* if (operating_mode == MODE_CLIENT || operating_mode == MODE_LOCAL) */
409 #endif
410 start_client ();
412 /* close syslog */
413 syslog (LOG_INFO, "Exiting normally");
414 closelog ();
416 if (daemonize)
417 pidfile_remove();
419 return (0);
420 }