1 /******************************************************************************
2 *
3 * This program is free software; you can redistribute it and/or modify
4 * it under the terms of the GNU General Public License as published by
5 * the Free Software Foundation; either version 2 of the License, or
6 * (at your option) any later version.
7 *
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
12 *
13 * You should have received a copy of the GNU General Public License
14 * along with this program; if not, write to the Free Software
15 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
16 *
17 *****************************************************************************/
19 const char *progname = "check_disk";
20 const char *revision = "$Revision$";
21 const char *copyright = "1999-2003";
22 const char *authors = "Nagios Plugin Development Team";
23 const char *email = "nagiosplug-devel@lists.sourceforge.net";
25 const char *summary = "\
26 This plugin checks the amount of used disk space on a mounted file system\n\
27 and generates an alert if free space is less than one of the threshold values.";
29 const char *option_summary = "\
30 -w limit -c limit [-p path | -x device] [-t timeout] [-m] [-e]\n\
31 [-v] [-q]";
33 const char *options = "\
34 -w, --warning=INTEGER\n\
35 Exit with WARNING status if less than INTEGER kilobytes of disk are free\n\
36 -w, --warning=PERCENT%%\n\
37 Exit with WARNING status if less than PERCENT of disk space is free\n\
38 -c, --critical=INTEGER\n\
39 Exit with CRITICAL status if less than INTEGER kilobytes of disk are free\n\
40 -c, --critical=PERCENT%%\n\
41 Exit with CRITCAL status if less than PERCENT of disk space is free\n\
42 -u, --units=STRING\n\
43 Choose bytes, kB, MB, GB, TB (default: MB)\n\
44 -k, --kilobytes\n\
45 Same as '--units kB'\n\
46 -m, --megabytes\n\
47 Same as '--units MB'\n\
48 -l, --local\n\
49 Only check local filesystems\n\
50 -p, --path=PATH, --partition=PARTITION\n\
51 Path or partition (may be repeated)\n\
52 -x, --exclude_device=PATH <STRING>\n\
53 Ignore device (only works if -p unspecified)\n\
54 -X, --exclude-type=TYPE <STRING>\n\
55 Ignore all filesystems of indicated type (may be repeated)\n\
56 -M, --mountpoint\n\
57 Display the mountpoint instead of the partition\n\
58 -e, --errors-only\n\
59 Display only devices/mountpoints with errors\n\
60 -v, --verbose\n\
61 Show details for command-line debugging (do not use with nagios server)\n\
62 -h, --help\n\
63 Print detailed help screen\n\
64 -V, --version\n\
65 Print version information\n";
67 const char *notes = "\
68 \n";
70 #include "common.h"
71 #if HAVE_INTTYPES_H
72 # include <inttypes.h>
73 #endif
74 #include <assert.h>
75 #include "popen.h"
76 #include "utils.h"
77 #include <stdarg.h>
78 #include "../lib/fsusage.h"
79 #include "../lib/mountlist.h"
80 #if HAVE_LIMITS_H
81 # include <limits.h>
82 #endif
84 /* If nonzero, show inode information. */
85 static int inode_format;
87 /* If nonzero, show even filesystems with zero size or
88 uninteresting types. */
89 static int show_all_fs = 1;
91 /* If nonzero, show only local filesystems. */
92 static int show_local_fs = 0;
94 /* If positive, the units to use when printing sizes;
95 if negative, the human-readable base. */
96 static int output_block_size;
98 /* If nonzero, invoke the `sync' system call before getting any usage data.
99 Using this option can make df very slow, especially with many or very
100 busy disks. Note that this may make a difference on some systems --
101 SunOs4.1.3, for one. It is *not* necessary on Linux. */
102 static int require_sync = 0;
104 /* A filesystem type to display. */
106 struct name_list
107 {
108 char *name;
109 struct name_list *name_next;
110 };
112 /* Linked list of filesystem types to display.
113 If `fs_select_list' is NULL, list all types.
114 This table is generated dynamically from command-line options,
115 rather than hardcoding into the program what it thinks are the
116 valid filesystem types; let the user specify any filesystem type
117 they want to, and if there are any filesystems of that type, they
118 will be shown.
120 Some filesystem types:
121 4.2 4.3 ufs nfs swap ignore io vm efs dbg */
123 static struct name_list *fs_select_list;
125 /* Linked list of filesystem types to omit.
126 If the list is empty, don't exclude any types. */
128 static struct name_list *fs_exclude_list;
130 static struct name_list *dp_exclude_list;
132 static struct name_list *path_select_list;
134 static struct name_list *dev_select_list;
136 /* Linked list of mounted filesystems. */
137 static struct mount_entry *mount_list;
139 /* For long options that have no equivalent short option, use a
140 non-character as a pseudo short option, starting with CHAR_MAX + 1. */
141 enum
142 {
143 SYNC_OPTION = CHAR_MAX + 1,
144 NO_SYNC_OPTION,
145 BLOCK_SIZE_OPTION
146 };
148 #ifdef _AIX
149 #pragma alloca
150 #endif
152 int process_arguments (int, char **);
153 int validate_arguments (void);
154 int check_disk (int usp, int free_disk);
155 int walk_name_list (struct name_list *list, const char *name);
156 void print_help (void);
157 void print_usage (void);
159 int w_df = -1;
160 int c_df = -1;
161 float w_dfp = -1.0;
162 float c_dfp = -1.0;
163 char *path = "";
164 char *exclude_device = "";
165 char *units = "MB";
166 unsigned long mult = 1024 * 1024;
167 int verbose = 0;
168 int erronly = FALSE;
169 int display_mntp = FALSE;
171 /* Linked list of mounted filesystems. */
172 static struct mount_entry *mount_list;
174 int
175 main (int argc, char **argv)
176 {
177 int usp = -1;
178 int total_disk = -1;
179 int used_disk = -1;
180 int free_disk = -1;
181 int result = STATE_UNKNOWN;
182 int disk_result = STATE_UNKNOWN;
183 char *command_line = "";
184 char input_buffer[MAX_INPUT_BUFFER];
185 char file_system[MAX_INPUT_BUFFER];
186 char mntp[MAX_INPUT_BUFFER];
187 char *output = "";
188 char *details = "";
189 float free_space, free_space_pct, total_space;
191 struct mount_entry *me;
192 struct fs_usage fsp;
193 char *disk;
195 mount_list = read_filesystem_list (0);
197 if (process_arguments (argc, argv) != OK)
198 usage ("Could not parse arguments\n");
200 for (me = mount_list; me; me = me->me_next) {
202 if ((dev_select_list &&
203 walk_name_list (dev_select_list, me->me_devname)) ||
204 (path_select_list &&
205 walk_name_list (path_select_list, me->me_mountdir)))
206 get_fs_usage (me->me_mountdir, me->me_devname, &fsp);
207 else if (dev_select_list || path_select_list)
208 continue;
209 else if (me->me_remote && show_local_fs)
210 continue;
211 else if (me->me_dummy && !show_all_fs)
212 continue;
213 else if (fs_exclude_list && walk_name_list (fs_exclude_list, me->me_type))
214 continue;
215 else if (dp_exclude_list &&
216 walk_name_list (dp_exclude_list, me->me_devname) ||
217 walk_name_list (dp_exclude_list, me->me_mountdir))
218 continue;
219 else
220 get_fs_usage (me->me_mountdir, me->me_devname, &fsp);
222 if (fsp.fsu_blocks && strcmp ("none", me->me_mountdir)) {
223 usp = (fsp.fsu_blocks - fsp.fsu_bavail) * 100 / fsp.fsu_blocks;
224 disk_result = check_disk (usp, fsp.fsu_bavail);
225 result = max_state (disk_result, result);
226 if (disk_result==STATE_OK && erronly && !verbose)
227 continue;
229 free_space = (float)fsp.fsu_bavail*fsp.fsu_blocksize/mult;
230 free_space_pct = (float)fsp.fsu_bavail*100/fsp.fsu_blocks;
231 total_space = (float)fsp.fsu_blocks*fsp.fsu_blocksize/mult;
232 if (disk_result!=STATE_OK || verbose>=0)
233 asprintf (&output, "%s [%.0f %s (%2.0f%%) free on %s]",
234 output,
235 free_space,
236 units,
237 free_space_pct,
238 (!strcmp(file_system, "none") || display_mntp) ? me->me_devname : me->me_mountdir);
239 asprintf (&details, "%s\n%.0f of %.0f %s (%2.0f%%) free on %s (type %s mounted on %s)",
240 details,
241 free_space,
242 total_space,
243 units,
244 free_space_pct,
245 me->me_devname,
246 me->me_type,
247 me->me_mountdir);
248 }
250 }
252 if (verbose > 2)
253 asprintf (&output, "%s%s", output, details);
255 terminate (result, "DISK %s%s\n", state_text (result), output, details);
256 }
260 \f
261 /* process command-line arguments */
262 int
263 process_arguments (int argc, char **argv)
264 {
265 int c;
266 struct name_list *se;
267 struct name_list **pathtail = &path_select_list;
268 struct name_list **devtail = &dev_select_list;
269 struct name_list **fstail = &fs_exclude_list;
270 struct name_list **dptail = &dp_exclude_list;
272 int option_index = 0;
273 static struct option long_options[] = {
274 {"timeout", required_argument, 0, 't'},
275 {"warning", required_argument, 0, 'w'},
276 {"critical", required_argument, 0, 'c'},
277 {"local", required_argument, 0, 'l'},
278 {"kilobytes", required_argument, 0, 'k'},
279 {"megabytes", required_argument, 0, 'm'},
280 {"units", required_argument, 0, 'u'},
281 {"path", required_argument, 0, 'p'},
282 {"partition", required_argument, 0, 'p'},
283 {"device", required_argument, 0, 'd'},
284 {"exclude_device", required_argument, 0, 'x'},
285 {"exclude-type", required_argument, 0, 'X'},
286 {"mountpoint", no_argument, 0, 'M'},
287 {"errors-only", no_argument, 0, 'e'},
288 {"verbose", no_argument, 0, 'v'},
289 {"quiet", no_argument, 0, 'q'},
290 {"version", no_argument, 0, 'V'},
291 {"help", no_argument, 0, 'h'},
292 {0, 0, 0, 0}
293 };
295 if (argc < 2)
296 return ERROR;
298 se = (struct name_list *) malloc (sizeof (struct name_list));
299 se->name = strdup ("iso9660");
300 se->name_next = NULL;
301 *fstail = se;
302 fstail = &se->name_next;
304 for (c = 1; c < argc; c++)
305 if (strcmp ("-to", argv[c]) == 0)
306 strcpy (argv[c], "-t");
308 while (1) {
309 c = getopt_long (argc, argv, "+?Vqhvet:c:w:u:p:d:x:X:mklM", long_options, &option_index);
311 if (c == -1 || c == EOF)
312 break;
314 switch (c) {
315 case 't': /* timeout period */
316 if (is_integer (optarg)) {
317 timeout_interval = atoi (optarg);
318 break;
319 }
320 else {
321 usage ("Timeout Interval must be an integer!\n");
322 }
323 case 'w': /* warning time threshold */
324 if (is_intnonneg (optarg)) {
325 w_df = atoi (optarg);
326 break;
327 }
328 else if (strpbrk (optarg, ",:") &&
329 strstr (optarg, "%") &&
330 sscanf (optarg, "%d%*[:,]%f%%", &w_df, &w_dfp) == 2) {
331 break;
332 }
333 else if (strstr (optarg, "%") && sscanf (optarg, "%f%%", &w_dfp) == 1) {
334 break;
335 }
336 else {
337 usage ("Warning threshold must be integer or percentage!\n");
338 }
339 case 'c': /* critical time threshold */
340 if (is_intnonneg (optarg)) {
341 c_df = atoi (optarg);
342 break;
343 }
344 else if (strpbrk (optarg, ",:") &&
345 strstr (optarg, "%") &&
346 sscanf (optarg, "%d%*[,:]%f%%", &c_df, &c_dfp) == 2) {
347 break;
348 }
349 else if (strstr (optarg, "%") && sscanf (optarg, "%f%%", &c_dfp) == 1) {
350 break;
351 }
352 else {
353 usage ("Critical threshold must be integer or percentage!\n");
354 }
355 case 'u':
356 if (! strcmp (optarg, "bytes")) {
357 mult = 1;
358 units = "B";
359 } else if (! strcmp (optarg, "kB")) {
360 mult = 1024;
361 units = "kB";
362 } else if (! strcmp (optarg, "MB")) {
363 mult = 1024 * 1024;
364 units = "MB";
365 } else if (! strcmp (optarg, "GB")) {
366 mult = 1024 * 1024 * 1024;
367 units = "GB";
368 } else if (! strcmp (optarg, "TB")) {
369 mult = (unsigned long)1024 * 1024 * 1024 * 1024;
370 units = "TB";
371 } else {
372 terminate (STATE_UNKNOWN, "unit type %s not known", optarg);
373 }
374 break;
375 case 'k': /* display mountpoint */
376 mult = 1024;
377 units = "kB";
378 break;
379 case 'm': /* display mountpoint */
380 mult = 1024 * 1024;
381 units = "MB";
382 break;
383 case 'l':
384 show_local_fs = 1;
385 break;
386 case 'p': /* selec path */
387 se = (struct name_list *) malloc (sizeof (struct name_list));
388 se->name = strdup (optarg);
389 se->name_next = NULL;
390 *pathtail = se;
391 pathtail = &se->name_next;
392 break;
393 case 'd': /* select partition/device */
394 se = (struct name_list *) malloc (sizeof (struct name_list));
395 se->name = strdup (optarg);
396 se->name_next = NULL;
397 *devtail = se;
398 devtail = &se->name_next;
399 break;
400 case 'x': /* exclude path or partition */
401 se = (struct name_list *) malloc (sizeof (struct name_list));
402 se->name = strdup (optarg);
403 se->name_next = NULL;
404 *dptail = se;
405 dptail = &se->name_next;
406 break;
407 break;
408 case 'X': /* exclude file system type */
409 se = (struct name_list *) malloc (sizeof (struct name_list));
410 se->name = strdup (optarg);
411 se->name_next = NULL;
412 *fstail = se;
413 fstail = &se->name_next;
414 break;
415 case 'v': /* verbose */
416 verbose++;
417 break;
418 case 'q': /* verbose */
419 verbose--;
420 break;
421 case 'e':
422 erronly = TRUE;
423 break;
424 case 'M': /* display mountpoint */
425 display_mntp = TRUE;
426 break;
427 case 'V': /* version */
428 print_revision (progname, revision);
429 exit (STATE_OK);
430 case 'h': /* help */
431 print_help ();
432 exit (STATE_OK);
433 case '?': /* help */
434 usage ("check_disk: unrecognized option\n");
435 break;
436 }
437 }
439 c = optind;
440 if (w_dfp == -1 && argc > c && is_intnonneg (argv[c]))
441 w_dfp = (100.0 - atof (argv[c++]));
443 if (c_dfp == -1 && argc > c && is_intnonneg (argv[c]))
444 c_dfp = (100.0 - atof (argv[c++]));
446 if (argc > c && strlen (path) == 0)
447 path = argv[c++];
449 return validate_arguments ();
450 }
454 int
455 validate_arguments ()
456 {
457 if (w_df < 0 && c_df < 0 && w_dfp < 0 && c_dfp < 0) {
458 printf ("INPUT ERROR: Unable to parse command line\n");
459 return ERROR;
460 }
461 else if ((w_dfp >= 0 || c_dfp >= 0)
462 && (w_dfp < 0 || c_dfp < 0 || w_dfp > 100 || c_dfp > 100
463 || c_dfp > w_dfp)) {
464 printf
465 ("INPUT ERROR: C_DFP (%f) should be less than W_DFP (%f) and both should be between zero and 100 percent, inclusive\n",
466 c_dfp, w_dfp);
467 return ERROR;
468 }
469 else if ((w_df > 0 || c_df > 0) && (w_df < 0 || c_df < 0 || c_df > w_df)) {
470 printf
471 ("INPUT ERROR: C_DF (%d) should be less than W_DF (%d) and both should be greater than zero\n",
472 c_df, w_df);
473 return ERROR;
474 }
475 else {
476 return OK;
477 }
478 }
482 \f
483 int
484 check_disk (int usp, int free_disk)
485 {
486 int result = STATE_UNKNOWN;
487 /* check the percent used space against thresholds */
488 if (usp >= 0 && usp >= (100.0 - c_dfp))
489 result = STATE_CRITICAL;
490 else if (c_df >= 0 && free_disk <= c_df)
491 result = STATE_CRITICAL;
492 else if (usp >= 0 && usp >= (100.0 - w_dfp))
493 result = STATE_WARNING;
494 else if (w_df >= 0 && free_disk <= w_df)
495 result = STATE_WARNING;
496 else if (usp >= 0.0)
497 result = STATE_OK;
498 return result;
499 }
503 int
504 walk_name_list (struct name_list *list, const char *name)
505 {
506 while (list) {
507 if (! strcmp(list->name, name))
508 return TRUE;
509 list = list->name_next;
510 }
511 return FALSE;
512 }
516 \f
517 void
518 print_help (void)
519 {
520 print_revision (progname, revision);
521 printf ("Copyright (c) %s %s\n\t<%s>\n\n%s\n",
522 copyright, authors, email, summary);
523 print_usage ();
524 printf ("\nOptions:\n");
525 printf (options);
526 printf (notes);
527 support ();
528 }
530 void
531 print_usage (void)
532 {
533 printf
534 ("Usage: %s %s\n"
535 " %s (-h|--help)\n"
536 " %s (-V|--version)\n", progname, option_summary, progname, progname);
537 }