af6a93e09e7b4664580cbaad98c1fa8c439c5b31
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 file.\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, CONFIGFILE, 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 (char *file)
219 {
220 FILE *fh;
222 if (file == NULL)
223 file = PIDFILE;
225 if ((fh = fopen (file, "w")) == NULL)
226 {
227 syslog (LOG_ERR, "fopen (%s): %s", file, strerror (errno));
228 return (1);
229 }
231 fprintf (fh, "%d\n", getpid());
232 fclose(fh);
234 return (0);
235 }
237 int pidfile_remove (void)
238 {
239 return (unlink (PIDFILE));
240 }
242 int main (int argc, char **argv)
243 {
244 struct sigaction sigIntAction, sigChldAction;
245 #if COLLECT_DAEMON
246 pid_t pid;
247 #endif
249 char *configfile = CONFIGFILE;
250 char *pidfile = PIDFILE;
251 char *plugindir = PLUGINDIR;
252 char *datadir = PKGLOCALSTATEDIR;
254 int daemonize = 1;
256 #ifdef HAVE_LIBRRD
257 operating_mode = MODE_LOCAL;
258 #endif
260 /* open syslog */
261 openlog (PACKAGE, LOG_CONS | LOG_PID, LOG_DAEMON);
263 /* read options */
264 while (1)
265 {
266 int c;
268 c = getopt (argc, argv, "C:P:M:D:fh"
269 #if HAVE_LIBRRD
270 "csl"
271 #endif /* HAVE_LIBRRD */
272 #if COLLECT_PING
273 "p:"
274 #endif /* COLLECT_PING */
275 );
277 if (c == -1)
278 break;
280 switch (c)
281 {
282 #ifdef HAVE_LIBRRD
283 case 'c':
284 operating_mode = MODE_CLIENT;
285 break;
287 case 's':
288 operating_mode = MODE_SERVER;
289 break;
291 case 'l':
292 operating_mode = MODE_LOCAL;
293 break;
294 #endif /* HAVE_LIBRRD */
295 case 'C':
296 configfile = optarg;
297 break;
298 case 'P':
299 pidfile = optarg;
300 break;
301 case 'M':
302 plugindir = optarg;
303 break;
304 case 'D':
305 datadir = optarg;
306 break;
307 case 'f':
308 daemonize = 0;
309 break;
310 #if COLLECT_PING
311 case 'p':
312 if (num_pinghosts < MAX_PINGHOSTS)
313 pinghosts[num_pinghosts++] = optarg;
314 else
315 fprintf (stderr, "Maximum of %i ping hosts reached.\n", MAX_PINGHOSTS);
316 break;
317 #endif /* COLLECT_PING */
318 case 'h':
319 default:
320 exit_usage (argv[0]);
321 }
323 }
325 /*
326 * Read the config file. This will load any modules automagically.
327 */
328 plugin_set_dir (plugindir);
330 if (cf_read (configfile))
331 {
332 fprintf (stderr, "Error: Reading the config file failed!\n"
333 "Read the syslog for details.\n");
334 return (1);
335 }
337 /*
338 * Change directory. We do this _after_ reading the config and loading
339 * modules to relative paths work as expected.
340 */
341 if (change_basedir (datadir))
342 {
343 fprintf (stderr, "Error: Unable to change to directory `%s'.\n", datadir);
344 return (1);
345 }
347 /*
348 * install signal handlers
349 */
350 sigIntAction.sa_handler = sigIntHandler;
351 sigaction (SIGINT, &sigIntAction, NULL);
353 sigChldAction.sa_handler = SIG_IGN;
354 sigaction (SIGCHLD, &sigChldAction, NULL);
356 /*
357 * fork off child
358 */
359 #if COLLECT_DAEMON
360 if (daemonize)
361 {
362 if ((pid = fork ()) == -1)
363 {
364 /* error */
365 fprintf (stderr, "fork: %s", strerror (errno));
366 return (1);
367 }
368 else if (pid != 0)
369 {
370 /* parent */
371 /* printf ("Running (PID %i)\n", pid); */
372 return (0);
373 }
375 /* Detach from session */
376 setsid ();
378 /* Write pidfile */
379 if (pidfile_create (pidfile))
380 exit (2);
382 /* close standard descriptors */
383 close (2);
384 close (1);
385 close (0);
387 if (open ("/dev/null", O_RDWR) != 0)
388 {
389 syslog (LOG_ERR, "Error: Could not connect `STDIN' to `/dev/null'");
390 return (1);
391 }
392 if (dup (0) != 1)
393 {
394 syslog (LOG_ERR, "Error: Could not connect `STDOUT' to `/dev/null'");
395 return (1);
396 }
397 if (dup (0) != 2)
398 {
399 syslog (LOG_ERR, "Error: Could not connect `STDERR' to `/dev/null'");
400 return (1);
401 }
402 } /* if (daemonize) */
403 #endif /* COLLECT_DAEMON */
405 /*
406 * run the actual loops
407 */
408 #ifdef HAVE_LIBRRD
409 if (operating_mode == MODE_SERVER)
410 start_server ();
411 else /* if (operating_mode == MODE_CLIENT || operating_mode == MODE_LOCAL) */
412 #endif
413 start_client ();
415 /* close syslog */
416 syslog (LOG_INFO, "Exiting normally");
417 closelog ();
419 if (daemonize)
420 pidfile_remove();
422 return (0);
423 }