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 int found;
110 struct name_list *name_next;
111 };
113 /* Linked list of filesystem types to display.
114 If `fs_select_list' is NULL, list all types.
115 This table is generated dynamically from command-line options,
116 rather than hardcoding into the program what it thinks are the
117 valid filesystem types; let the user specify any filesystem type
118 they want to, and if there are any filesystems of that type, they
119 will be shown.
121 Some filesystem types:
122 4.2 4.3 ufs nfs swap ignore io vm efs dbg */
124 static struct name_list *fs_select_list;
126 /* Linked list of filesystem types to omit.
127 If the list is empty, don't exclude any types. */
129 static struct name_list *fs_exclude_list;
131 static struct name_list *dp_exclude_list;
133 static struct name_list *path_select_list;
135 static struct name_list *dev_select_list;
137 /* Linked list of mounted filesystems. */
138 static struct mount_entry *mount_list;
140 /* For long options that have no equivalent short option, use a
141 non-character as a pseudo short option, starting with CHAR_MAX + 1. */
142 enum
143 {
144 SYNC_OPTION = CHAR_MAX + 1,
145 NO_SYNC_OPTION,
146 BLOCK_SIZE_OPTION
147 };
149 #ifdef _AIX
150 #pragma alloca
151 #endif
153 int process_arguments (int, char **);
154 int validate_arguments (void);
155 int check_disk (int usp, int free_disk);
156 int walk_name_list (struct name_list *list, const char *name);
157 void print_help (void);
158 void print_usage (void);
160 int w_df = -1;
161 int c_df = -1;
162 float w_dfp = -1.0;
163 float c_dfp = -1.0;
164 char *path = "";
165 char *exclude_device = "";
166 char *units = "MB";
167 unsigned long mult = 1024 * 1024;
168 int verbose = 0;
169 int erronly = FALSE;
170 int display_mntp = FALSE;
172 /* Linked list of mounted filesystems. */
173 static struct mount_entry *mount_list;
175 int
176 main (int argc, char **argv)
177 {
178 int usp = -1;
179 int total_disk = -1;
180 int used_disk = -1;
181 int free_disk = -1;
182 int result = STATE_UNKNOWN;
183 int disk_result = STATE_UNKNOWN;
184 char *command_line = "";
185 char input_buffer[MAX_INPUT_BUFFER];
186 char file_system[MAX_INPUT_BUFFER];
187 char mntp[MAX_INPUT_BUFFER];
188 char *output = "";
189 char *details = "";
190 float free_space, free_space_pct, total_space;
192 struct mount_entry *me;
193 struct fs_usage fsp;
194 struct name_list *temp_list;
195 char *disk;
197 mount_list = read_filesystem_list (0);
199 if (process_arguments (argc, argv) != OK)
200 usage ("Could not parse arguments\n");
202 for (me = mount_list; me; me = me->me_next) {
204 if (path_select_list &&
205 (walk_name_list (path_select_list, me->me_mountdir) ||
206 walk_name_list (path_select_list, me->me_devname) ) )
207 get_fs_usage (me->me_mountdir, me->me_devname, &fsp);
208 else if (dev_select_list || path_select_list)
209 continue;
210 else if (me->me_remote && show_local_fs)
211 continue;
212 else if (me->me_dummy && !show_all_fs)
213 continue;
214 else if (fs_exclude_list && walk_name_list (fs_exclude_list, me->me_type))
215 continue;
216 else if (dp_exclude_list &&
217 walk_name_list (dp_exclude_list, me->me_devname) ||
218 walk_name_list (dp_exclude_list, me->me_mountdir))
219 continue;
220 else
221 get_fs_usage (me->me_mountdir, me->me_devname, &fsp);
223 if (fsp.fsu_blocks && strcmp ("none", me->me_mountdir)) {
224 usp = (fsp.fsu_blocks - fsp.fsu_bavail) * 100 / fsp.fsu_blocks;
225 disk_result = check_disk (usp, fsp.fsu_bavail);
226 result = max_state (disk_result, result);
227 if (disk_result==STATE_OK && erronly && !verbose)
228 continue;
230 free_space = (float)fsp.fsu_bavail*fsp.fsu_blocksize/mult;
231 free_space_pct = (float)fsp.fsu_bavail*100/fsp.fsu_blocks;
232 total_space = (float)fsp.fsu_blocks*fsp.fsu_blocksize/mult;
233 if (disk_result!=STATE_OK || verbose>=0)
234 asprintf (&output, "%s [%.0f %s (%2.0f%%) free on %s]",
235 output,
236 free_space,
237 units,
238 free_space_pct,
239 (!strcmp(file_system, "none") || display_mntp) ? me->me_devname : me->me_mountdir);
240 asprintf (&details, "%s\n%.0f of %.0f %s (%2.0f%%) free on %s (type %s mounted on %s)",
241 details,
242 free_space,
243 total_space,
244 units,
245 free_space_pct,
246 me->me_devname,
247 me->me_type,
248 me->me_mountdir);
249 }
251 }
253 if (verbose > 2)
254 asprintf (&output, "%s%s", output, details);
256 /* Override result if paths specified and not found */
257 temp_list = path_select_list;
258 while (temp_list) {
259 if (temp_list->found != TRUE) {
260 asprintf (&output, "%s [%s not found]", output, temp_list->name);
261 result = STATE_CRITICAL;
262 }
263 temp_list = temp_list->name_next;
264 }
266 terminate (result, "DISK %s%s\n", state_text (result), output, details);
267 }
271 \f
272 /* process command-line arguments */
273 int
274 process_arguments (int argc, char **argv)
275 {
276 int c;
277 struct name_list *se;
278 struct name_list **pathtail = &path_select_list;
279 struct name_list **devtail = &dev_select_list;
280 struct name_list **fstail = &fs_exclude_list;
281 struct name_list **dptail = &dp_exclude_list;
283 int option_index = 0;
284 static struct option long_options[] = {
285 {"timeout", required_argument, 0, 't'},
286 {"warning", required_argument, 0, 'w'},
287 {"critical", required_argument, 0, 'c'},
288 {"local", required_argument, 0, 'l'},
289 {"kilobytes", required_argument, 0, 'k'},
290 {"megabytes", required_argument, 0, 'm'},
291 {"units", required_argument, 0, 'u'},
292 {"path", required_argument, 0, 'p'},
293 {"partition", required_argument, 0, 'p'},
294 {"exclude_device", required_argument, 0, 'x'},
295 {"exclude-type", required_argument, 0, 'X'},
296 {"mountpoint", no_argument, 0, 'M'},
297 {"errors-only", no_argument, 0, 'e'},
298 {"verbose", no_argument, 0, 'v'},
299 {"quiet", no_argument, 0, 'q'},
300 {"version", no_argument, 0, 'V'},
301 {"help", no_argument, 0, 'h'},
302 {0, 0, 0, 0}
303 };
305 if (argc < 2)
306 return ERROR;
308 se = (struct name_list *) malloc (sizeof (struct name_list));
309 se->name = strdup ("iso9660");
310 se->name_next = NULL;
311 *fstail = se;
312 fstail = &se->name_next;
314 for (c = 1; c < argc; c++)
315 if (strcmp ("-to", argv[c]) == 0)
316 strcpy (argv[c], "-t");
318 while (1) {
319 c = getopt_long (argc, argv, "+?Vqhvet:c:w:u:p:x:X:mklM", long_options, &option_index);
321 if (c == -1 || c == EOF)
322 break;
324 switch (c) {
325 case 't': /* timeout period */
326 if (is_integer (optarg)) {
327 timeout_interval = atoi (optarg);
328 break;
329 }
330 else {
331 usage ("Timeout Interval must be an integer!\n");
332 }
333 case 'w': /* warning time threshold */
334 if (is_intnonneg (optarg)) {
335 w_df = atoi (optarg);
336 break;
337 }
338 else if (strpbrk (optarg, ",:") &&
339 strstr (optarg, "%") &&
340 sscanf (optarg, "%d%*[:,]%f%%", &w_df, &w_dfp) == 2) {
341 break;
342 }
343 else if (strstr (optarg, "%") && sscanf (optarg, "%f%%", &w_dfp) == 1) {
344 break;
345 }
346 else {
347 usage ("Warning threshold must be integer or percentage!\n");
348 }
349 case 'c': /* critical time threshold */
350 if (is_intnonneg (optarg)) {
351 c_df = atoi (optarg);
352 break;
353 }
354 else if (strpbrk (optarg, ",:") &&
355 strstr (optarg, "%") &&
356 sscanf (optarg, "%d%*[,:]%f%%", &c_df, &c_dfp) == 2) {
357 break;
358 }
359 else if (strstr (optarg, "%") && sscanf (optarg, "%f%%", &c_dfp) == 1) {
360 break;
361 }
362 else {
363 usage ("Critical threshold must be integer or percentage!\n");
364 }
365 case 'u':
366 if (! strcmp (optarg, "bytes")) {
367 mult = 1;
368 units = "B";
369 } else if (! strcmp (optarg, "kB")) {
370 mult = 1024;
371 units = "kB";
372 } else if (! strcmp (optarg, "MB")) {
373 mult = 1024 * 1024;
374 units = "MB";
375 } else if (! strcmp (optarg, "GB")) {
376 mult = 1024 * 1024 * 1024;
377 units = "GB";
378 } else if (! strcmp (optarg, "TB")) {
379 mult = (unsigned long)1024 * 1024 * 1024 * 1024;
380 units = "TB";
381 } else {
382 terminate (STATE_UNKNOWN, "unit type %s not known\n", optarg);
383 }
384 break;
385 case 'k': /* display mountpoint */
386 mult = 1024;
387 units = "kB";
388 break;
389 case 'm': /* display mountpoint */
390 mult = 1024 * 1024;
391 units = "MB";
392 break;
393 case 'l':
394 show_local_fs = 1;
395 break;
396 case 'p': /* select path */
397 se = (struct name_list *) malloc (sizeof (struct name_list));
398 se->name = strdup (optarg);
399 se->name_next = NULL;
400 *pathtail = se;
401 pathtail = &se->name_next;
402 break;
403 case 'x': /* exclude path or partition */
404 se = (struct name_list *) malloc (sizeof (struct name_list));
405 se->name = strdup (optarg);
406 se->name_next = NULL;
407 *dptail = se;
408 dptail = &se->name_next;
409 break;
410 break;
411 case 'X': /* exclude file system type */
412 se = (struct name_list *) malloc (sizeof (struct name_list));
413 se->name = strdup (optarg);
414 se->name_next = NULL;
415 *fstail = se;
416 fstail = &se->name_next;
417 break;
418 case 'v': /* verbose */
419 verbose++;
420 break;
421 case 'q': /* verbose */
422 verbose--;
423 break;
424 case 'e':
425 erronly = TRUE;
426 break;
427 case 'M': /* display mountpoint */
428 display_mntp = TRUE;
429 break;
430 case 'V': /* version */
431 print_revision (progname, revision);
432 exit (STATE_OK);
433 case 'h': /* help */
434 print_help ();
435 exit (STATE_OK);
436 case '?': /* help */
437 usage ("check_disk: unrecognized option\n");
438 break;
439 }
440 }
442 c = optind;
443 if (w_dfp == -1 && argc > c && is_intnonneg (argv[c]))
444 w_dfp = (100.0 - atof (argv[c++]));
446 if (c_dfp == -1 && argc > c && is_intnonneg (argv[c]))
447 c_dfp = (100.0 - atof (argv[c++]));
449 if (argc > c && strlen (path) == 0)
450 path = argv[c++];
452 return validate_arguments ();
453 }
457 int
458 validate_arguments ()
459 {
460 if (w_df < 0 && c_df < 0 && w_dfp < 0 && c_dfp < 0) {
461 printf ("INPUT ERROR: Unable to parse command line\n");
462 return ERROR;
463 }
464 else if ((w_dfp >= 0 || c_dfp >= 0)
465 && (w_dfp < 0 || c_dfp < 0 || w_dfp > 100 || c_dfp > 100
466 || c_dfp > w_dfp)) {
467 printf
468 ("INPUT ERROR: C_DFP (%f) should be less than W_DFP (%f) and both should be between zero and 100 percent, inclusive\n",
469 c_dfp, w_dfp);
470 return ERROR;
471 }
472 else if ((w_df > 0 || c_df > 0) && (w_df < 0 || c_df < 0 || c_df > w_df)) {
473 printf
474 ("INPUT ERROR: C_DF (%d) should be less than W_DF (%d) and both should be greater than zero\n",
475 c_df, w_df);
476 return ERROR;
477 }
478 else {
479 return OK;
480 }
481 }
485 \f
486 int
487 check_disk (int usp, int free_disk)
488 {
489 int result = STATE_UNKNOWN;
490 /* check the percent used space against thresholds */
491 if (usp >= 0 && usp >= (100.0 - c_dfp))
492 result = STATE_CRITICAL;
493 else if (c_df >= 0 && free_disk <= c_df)
494 result = STATE_CRITICAL;
495 else if (usp >= 0 && usp >= (100.0 - w_dfp))
496 result = STATE_WARNING;
497 else if (w_df >= 0 && free_disk <= w_df)
498 result = STATE_WARNING;
499 else if (usp >= 0.0)
500 result = STATE_OK;
501 return result;
502 }
506 int
507 walk_name_list (struct name_list *list, const char *name)
508 {
509 while (list) {
510 if (! strcmp(list->name, name)) {
511 list->found = 1;
512 return TRUE;
513 }
514 list = list->name_next;
515 }
516 return FALSE;
517 }
521 \f
522 void
523 print_help (void)
524 {
525 print_revision (progname, revision);
526 printf ("Copyright (c) %s %s\n\t<%s>\n\n%s\n",
527 copyright, authors, email, summary);
528 print_usage ();
529 printf ("\nOptions:\n");
530 printf (options);
531 printf (notes);
532 support ();
533 }
535 void
536 print_usage (void)
537 {
538 printf
539 ("Usage: %s %s\n"
540 " %s (-h|--help)\n"
541 " %s (-V|--version)\n", progname, option_summary, progname, progname);
542 }