1 /*****************************************************************************
2 *
3 * Nagios check_swap plugin
4 *
5 * License: GPL
6 * Copyright (c) 2000 Karl DeBisschop (kdebisschop@users.sourceforge.net)
7 * Copyright (c) 2000-2014 Nagios Plugins Development Team
8 *
9 * Description:
10 *
11 * This file contains the check_swap plugin
12 *
13 *
14 * This program is free software: you can redistribute it and/or modify
15 * it under the terms of the GNU General Public License as published by
16 * the Free Software Foundation, either version 3 of the License, or
17 * (at your option) any later version.
18 *
19 * This program is distributed in the hope that it will be useful,
20 * but WITHOUT ANY WARRANTY; without even the implied warranty of
21 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
22 * GNU General Public License for more details.
23 *
24 * You should have received a copy of the GNU General Public License
25 * along with this program. If not, see <http://www.gnu.org/licenses/>.
26 *
27 *
28 *****************************************************************************/
29
30 const char *progname = "check_swap";
31 const char *copyright = "2000-2014";
32 const char *email = "devel@nagios-plugins.org";
33
34 #include "common.h"
35 #include "popen.h"
36 #include "utils.h"
37
38 #ifdef HAVE_DECL_SWAPCTL
39 # ifdef HAVE_SYS_PARAM_H
40 # include <sys/param.h>
41 # endif
42 # ifdef HAVE_SYS_SWAP_H
43 # include <sys/swap.h>
44 # endif
45 # ifdef HAVE_SYS_STAT_H
46 # include <sys/stat.h>
47 # endif
48 #endif
49
50 #ifndef SWAP_CONVERSION
51 # define SWAP_CONVERSION 1
52 #endif
53
54 int check_swap (int usp, double free_swap_mb);
55 int process_arguments (int argc, char **argv);
56 int validate_arguments (void);
57 void print_usage (void);
58 void print_help (void);
59
60 int have_warn = 0;
61 int have_crit = 0;
62 int warn_percent = 0;
63 int crit_percent = 0;
64 double warn_size_bytes = 0;
65 double crit_size_bytes= 0;
66 int verbose;
67 int allswaps;
68 int no_swap_state = STATE_CRITICAL;
69
70 int
main(int argc,char ** argv)71 main (int argc, char **argv)
72 {
73 int percent_used, percent;
74 double total_swap_mb = 0, used_swap_mb = 0, free_swap_mb = 0;
75 double dsktotal_mb = 0, dskused_mb = 0, dskfree_mb = 0, tmp_mb = 0;
76 int result = STATE_UNKNOWN;
77 char input_buffer[MAX_INPUT_BUFFER];
78 #ifdef HAVE_PROC_MEMINFO
79 FILE *fp;
80 #else
81 int conv_factor = SWAP_CONVERSION;
82 # ifdef HAVE_SWAP
83 char *temp_buffer;
84 char *swap_command;
85 char *swap_format;
86 # else
87 # ifdef HAVE_DECL_SWAPCTL
88 int i=0, nswaps=0, swapctl_res=0;
89 # ifdef CHECK_SWAP_SWAPCTL_SVR4
90 swaptbl_t *tbl=NULL;
91 swapent_t *ent=NULL;
92 # else
93 # ifdef CHECK_SWAP_SWAPCTL_BSD
94 struct swapent *ent;
95 # endif /* CHECK_SWAP_SWAPCTL_BSD */
96 # endif /* CHECK_SWAP_SWAPCTL_SVR4 */
97 # endif /* HAVE_DECL_SWAPCTL */
98 # endif
99 #endif
100 char str[32];
101 char *status;
102
103 setlocale (LC_ALL, ""); setlocale(LC_NUMERIC, "C");
104 bindtextdomain (PACKAGE, LOCALEDIR);
105 textdomain (PACKAGE);
106
107 status = strdup ("");
108
109 /* Parse extra opts if any */
110 argv=np_extra_opts (&argc, argv, progname);
111
112 if (process_arguments (argc, argv) == ERROR)
113 usage4 (_("Could not parse arguments"));
114
115 #ifdef HAVE_PROC_MEMINFO
116 if (verbose >= 3) {
117 printf("Reading PROC_MEMINFO at %s\n", PROC_MEMINFO);
118 }
119 fp = fopen (PROC_MEMINFO, "r");
120 while (fgets (input_buffer, MAX_INPUT_BUFFER - 1, fp)) {
121 if (sscanf (input_buffer, "%*[S]%*[w]%*[a]%*[p]%*[:] %lf %lf %lf", &dsktotal_mb, &dskused_mb, &dskfree_mb) == 3) {
122 dsktotal_mb = dsktotal_mb / 1048576; /* Apply conversion */
123 dskused_mb = dskused_mb / 1048576;
124 dskfree_mb = dskfree_mb / 1048576;
125 total_swap_mb += dsktotal_mb;
126 used_swap_mb += dskused_mb;
127 free_swap_mb += dskfree_mb;
128 if (allswaps) {
129 if (dsktotal_mb == 0)
130 percent=0.0;
131 else
132 percent = 100 * (((double) dskused_mb) / ((double) dsktotal_mb));
133 result = max_state (result, check_swap (percent, dskfree_mb));
134 if (verbose)
135 xasprintf (&status, "%s [%.0f (%d%%)]", status, dskfree_mb, 100 - percent);
136 }
137 }
138 else if (sscanf (input_buffer, "%*[S]%*[w]%*[a]%*[p]%[TotalFre]%*[:] %lf %*[k]%*[B]", str, &tmp_mb)) {
139 if (verbose >= 3) {
140 printf("Got %s with %lf\n", str, tmp_mb);
141 }
142 /* I think this part is always in Kb, so convert to mb */
143 if (strcmp ("Total", str) == 0) {
144 dsktotal_mb = tmp_mb / 1024;
145 }
146 else if (strcmp ("Free", str) == 0) {
147 dskfree_mb = tmp_mb / 1024;
148 }
149 }
150 }
151 fclose(fp);
152 dskused_mb = dsktotal_mb - dskfree_mb;
153 total_swap_mb = dsktotal_mb;
154 used_swap_mb = dskused_mb;
155 free_swap_mb = dskfree_mb;
156 #else
157 # ifdef HAVE_SWAP
158 xasprintf(&swap_command, "%s", SWAP_COMMAND);
159 xasprintf(&swap_format, "%s", SWAP_FORMAT);
160
161 /* These override the command used if a summary (and thus ! allswaps) is required */
162 /* The summary flag returns more accurate information about swap usage on these OSes */
163 # ifdef _AIX
164 if (!allswaps) {
165 xasprintf(&swap_command, "%s", "/usr/sbin/lsps -s");
166 xasprintf(&swap_format, "%s", "%lf%*s %lf");
167 conv_factor = 1;
168 }
169 # endif
170
171 if (verbose >= 2)
172 printf (_("Command: %s\n"), swap_command);
173 if (verbose >= 3)
174 printf (_("Format: %s\n"), swap_format);
175
176 child_process = spopen (swap_command);
177 if (child_process == NULL) {
178 printf (_("Could not open pipe: %s\n"), swap_command);
179 return STATE_UNKNOWN;
180 }
181
182 child_stderr = fdopen (child_stderr_array[fileno (child_process)], "r");
183 if (child_stderr == NULL)
184 printf (_("Could not open stderr for %s\n"), swap_command);
185
186 sprintf (str, "%s", "");
187 /* read 1st line */
188 fgets (input_buffer, MAX_INPUT_BUFFER - 1, child_process);
189 if (strcmp (swap_format, "") == 0) {
190 temp_buffer = strtok (input_buffer, " \n");
191 while (temp_buffer) {
192 if (strstr (temp_buffer, "blocks"))
193 sprintf (str, "%s %s", str, "%lf");
194 else if (strstr (temp_buffer, "dskfree"))
195 sprintf (str, "%s %s", str, "%lf");
196 else
197 sprintf (str, "%s %s", str, "%*s");
198 temp_buffer = strtok (NULL, " \n");
199 }
200 }
201
202 /* If different swap command is used for summary switch, need to read format differently */
203 # ifdef _AIX
204 if (!allswaps) {
205 fgets(input_buffer, MAX_INPUT_BUFFER - 1, child_process); /* Ignore first line */
206 sscanf (input_buffer, swap_format, &total_swap_mb, &used_swap_mb);
207 free_swap_mb = total_swap_mb * (100 - used_swap_mb) /100;
208 used_swap_mb = total_swap_mb - free_swap_mb;
209 if (verbose >= 3)
210 printf (_("total=%.0f, used=%.0f, free=%.0f\n"), total_swap_mb, used_swap_mb, free_swap_mb);
211 } else {
212 # endif
213 while (fgets (input_buffer, MAX_INPUT_BUFFER - 1, child_process)) {
214 sscanf (input_buffer, swap_format, &dsktotal_mb, &dskfree_mb);
215
216 dsktotal_mb = dsktotal_mb / conv_factor;
217 /* AIX lists percent used, so this converts to dskfree in MBs */
218 # ifdef _AIX
219 dskfree_mb = dsktotal_mb * (100 - dskfree_mb) / 100;
220 # else
221 dskfree_mb = dskfree_mb / conv_factor;
222 # endif
223 if (verbose >= 3)
224 printf (_("total=%.0f, free=%.0f\n"), dsktotal_mb, dskfree_mb);
225
226 dskused_mb = dsktotal_mb - dskfree_mb;
227 total_swap_mb += dsktotal_mb;
228 used_swap_mb += dskused_mb;
229 free_swap_mb += dskfree_mb;
230 if (allswaps) {
231 percent = 100 * (((double) dskused_mb) / ((double) dsktotal_mb));
232 result = max_state (result, check_swap (percent, dskfree_mb));
233 if (verbose)
234 xasprintf (&status, "%s [%.0f (%d%%)]", status, dskfree_mb, 100 - percent);
235 }
236 }
237 # ifdef _AIX
238 }
239 # endif
240
241 /* If we get anything on STDERR, at least set warning */
242 while (fgets (input_buffer, MAX_INPUT_BUFFER - 1, child_stderr))
243 result = max_state (result, STATE_WARNING);
244
245 /* close stderr */
246 (void) fclose (child_stderr);
247
248 /* close the pipe */
249 if (spclose (child_process))
250 result = max_state (result, STATE_WARNING);
251 # else
252 # ifdef CHECK_SWAP_SWAPCTL_SVR4
253
254 /* get the number of active swap devices */
255 if((nswaps=swapctl(SC_GETNSWP, NULL))== -1)
256 die(STATE_UNKNOWN, _("Error getting swap devices\n") );
257
258 if(nswaps == 0)
259 die(STATE_OK, _("SWAP OK: No swap devices defined\n"));
260
261 if(verbose >= 3)
262 printf("Found %d swap device(s)\n", nswaps);
263
264 /* initialize swap table + entries */
265 tbl=(swaptbl_t*)malloc(sizeof(swaptbl_t)+(sizeof(swapent_t)*nswaps));
266
267 if(tbl==NULL)
268 die(STATE_UNKNOWN, _("malloc() failed!\n"));
269
270 memset(tbl, 0, sizeof(swaptbl_t)+(sizeof(swapent_t)*nswaps));
271 tbl->swt_n=nswaps;
272 for(i=0;i<nswaps;i++){
273 if((tbl->swt_ent[i].ste_path=(char*)malloc(sizeof(char)*MAXPATHLEN)) == NULL)
274 die(STATE_UNKNOWN, _("malloc() failed!\n"));
275 }
276
277 /* and now, tally 'em up */
278 swapctl_res=swapctl(SC_LIST, tbl);
279 if(swapctl_res < 0){
280 perror(_("swapctl failed: "));
281 die(STATE_UNKNOWN, _("Error in swapctl call\n"));
282 }
283
284 for(i=0;i<nswaps;i++){
285 dsktotal_mb = (double) tbl->swt_ent[i].ste_pages / SWAP_CONVERSION;
286 dskfree_mb = (double) tbl->swt_ent[i].ste_free / SWAP_CONVERSION;
287 dskused_mb = ( dsktotal_mb - dskfree_mb );
288
289 if (verbose >= 3)
290 printf ("dsktotal_mb=%.0f dskfree_mb=%.0f dskused_mb=%.0f\n", dsktotal_mb, dskfree_mb, dskused_mb);
291
292 if(allswaps && dsktotal_mb > 0){
293 percent = 100 * (((double) dskused_mb) / ((double) dsktotal_mb));
294 result = max_state (result, check_swap (percent, dskfree_mb));
295 if (verbose) {
296 xasprintf (&status, "%s [%.0f (%d%%)]", status, dskfree_mb, 100 - percent);
297 }
298 }
299
300 total_swap_mb += dsktotal_mb;
301 free_swap_mb += dskfree_mb;
302 used_swap_mb += dskused_mb;
303 }
304
305 /* and clean up after ourselves */
306 for(i=0;i<nswaps;i++){
307 free(tbl->swt_ent[i].ste_path);
308 }
309 free(tbl);
310 # else
311 # ifdef CHECK_SWAP_SWAPCTL_BSD
312
313 /* get the number of active swap devices */
314 nswaps=swapctl(SWAP_NSWAP, NULL, 0);
315
316 /* initialize swap table + entries */
317 ent=(struct swapent*)malloc(sizeof(struct swapent)*nswaps);
318
319 /* and now, tally 'em up */
320 swapctl_res=swapctl(SWAP_STATS, ent, nswaps);
321 if(swapctl_res < 0){
322 perror(_("swapctl failed: "));
323 die(STATE_UNKNOWN, _("Error in swapctl call\n"));
324 }
325
326 for(i=0;i<nswaps;i++){
327 dsktotal_mb = (double) ent[i].se_nblks / conv_factor;
328 dskused_mb = (double) ent[i].se_inuse / conv_factor;
329 dskfree_mb = ( dsktotal_mb - dskused_mb );
330
331 if(allswaps && dsktotal_mb > 0){
332 percent = 100 * (((double) dskused_mb) / ((double) dsktotal_mb));
333 result = max_state (result, check_swap (percent, dskfree_mb));
334 if (verbose) {
335 xasprintf (&status, "%s [%.0f (%d%%)]", status, dskfree_mb, 100 - percent);
336 }
337 }
338
339 total_swap_mb += dsktotal_mb;
340 free_swap_mb += dskfree_mb;
341 used_swap_mb += dskused_mb;
342 }
343
344 /* and clean up after ourselves */
345 free(ent);
346
347 # endif /* CHECK_SWAP_SWAPCTL_BSD */
348 # endif /* CHECK_SWAP_SWAPCTL_SVR4 */
349 # endif /* HAVE_SWAP */
350 #endif /* HAVE_PROC_MEMINFO */
351
352 /* if total_swap_mb == 0, swap is most likely missing or disabled and should go critical */
353 if(total_swap_mb == 0) {
354 percent_used = 100;
355 status = "- Swap is either disabled, not present, or of zero size. ";
356 } else if(total_swap_mb > 0) {
357 percent_used = 100 * ((double) used_swap_mb) / ((double) total_swap_mb);
358 } else {
359 percent_used = 100;
360 status = "- Swap is either disabled, not present, or of zero size. ";
361 }
362
363 result = max_state (result, check_swap (percent_used, free_swap_mb));
364 printf (_("SWAP %s - %d%% free (%d MB out of %d MB) %s|"),
365 state_text (result),
366 (100 - percent_used), (int) free_swap_mb, (int) total_swap_mb, status);
367
368 puts (perfdata ("swap", (long) free_swap_mb, "MB",
369 TRUE, (long) max (warn_size_bytes/(1024 * 1024), warn_percent/100.0*total_swap_mb),
370 TRUE, (long) max (crit_size_bytes/(1024 * 1024), crit_percent/100.0*total_swap_mb),
371 TRUE, 0,
372 TRUE, (long) total_swap_mb));
373
374 return result;
375 }
376
377
378
379 int
check_swap(int usp,double free_swap_mb)380 check_swap (int usp, double free_swap_mb)
381 {
382 if (!free_swap_mb) return no_swap_state;
383
384 int result = STATE_UNKNOWN;
385 double free_swap = free_swap_mb * (1024 * 1024); /* Convert back to bytes as warn and crit specified in bytes */
386 if (usp >= 0 && crit_percent != 0 && usp >= (100.0 - crit_percent))
387 result = STATE_CRITICAL;
388 else if (crit_size_bytes > 0 && free_swap <= crit_size_bytes)
389 result = STATE_CRITICAL;
390 else if (usp >= 0 && warn_percent != 0 && usp >= (100.0 - warn_percent))
391 result = STATE_WARNING;
392 else if (warn_size_bytes > 0 && free_swap <= warn_size_bytes)
393 result = STATE_WARNING;
394 else if (usp >= 0.0)
395 result = STATE_OK;
396 return result;
397 }
398
399
400
401 /* process command-line arguments */
402 int
process_arguments(int argc,char ** argv)403 process_arguments (int argc, char **argv)
404 {
405 int c = 0; /* option character */
406
407 int option = 0;
408 static struct option longopts[] = {
409 {"warning", required_argument, 0, 'w'},
410 {"critical", required_argument, 0, 'c'},
411 {"allswaps", no_argument, 0, 'a'},
412 {"no-swap", required_argument, 0, 'n'},
413 {"verbose", no_argument, 0, 'v'},
414 {"version", no_argument, 0, 'V'},
415 {"help", no_argument, 0, 'h'},
416 {0, 0, 0, 0}
417 };
418
419 if (argc < 2)
420 return ERROR;
421
422 while (1) {
423 c = getopt_long (argc, argv, "+?Vvhac:w:n:", longopts, &option);
424
425 if (c == -1 || c == EOF)
426 break;
427
428 switch (c) {
429 case 'w': /* warning size threshold */
430 if (is_intnonneg (optarg)) {
431 warn_size_bytes = (double) atoi (optarg);
432 have_warn = TRUE;
433 break;
434 }
435 else if (strstr (optarg, ",") &&
436 strstr (optarg, "%") &&
437 sscanf (optarg, "%lf,%d%%", &warn_size_bytes, &warn_percent) == 2) {
438 warn_size_bytes = floorf(warn_size_bytes);
439 have_warn = TRUE;
440 break;
441 }
442 else if (strstr (optarg, "%") &&
443 sscanf (optarg, "%d%%", &warn_percent) == 1) {
444 have_warn = TRUE;
445 break;
446 }
447 else {
448 usage4 (_("Warning threshold must be integer or percentage!"));
449 }
450 case 'c': /* critical size threshold */
451 if (is_intnonneg (optarg)) {
452 crit_size_bytes = (double) atoi (optarg);
453 have_crit = TRUE;
454 break;
455 }
456 else if (strstr (optarg, ",") &&
457 strstr (optarg, "%") &&
458 sscanf (optarg, "%lf,%d%%", &crit_size_bytes, &crit_percent) == 2) {
459 crit_size_bytes = floorf(crit_size_bytes);
460 have_crit = TRUE;
461 break;
462 }
463 else if (strstr (optarg, "%") &&
464 sscanf (optarg, "%d%%", &crit_percent) == 1) {
465 have_crit = TRUE;
466 break;
467 }
468 else {
469 usage4 (_("Critical threshold must be integer or percentage!"));
470 }
471 case 'a': /* all swap */
472 allswaps = TRUE;
473 break;
474 case 'n': /* no-swap */
475 if ((no_swap_state = translate_state(optarg)) == ERROR) {
476 usage4 (_("no-swap result must be a valid state name (OK, WARNING, CRITICAL, UNKNOWN) or integer (0-3)."));
477 }
478 case 'v': /* verbose */
479 verbose++;
480 break;
481 case 'V': /* version */
482 print_revision (progname, NP_VERSION);
483 exit (STATE_OK);
484 case 'h': /* help */
485 print_help ();
486 exit (STATE_OK);
487 case '?': /* error */
488 usage5 ();
489 }
490 }
491
492 c = optind;
493 if (c == argc)
494 return validate_arguments ();
495 if (warn_percent == 0 && is_intnonneg (argv[c]))
496 warn_percent = atoi (argv[c++]);
497
498 if (c == argc)
499 return validate_arguments ();
500 if (crit_percent == 0 && is_intnonneg (argv[c]))
501 crit_percent = atoi (argv[c++]);
502
503 if (c == argc)
504 return validate_arguments ();
505 if (warn_size_bytes == 0 && is_intnonneg (argv[c]))
506 warn_size_bytes = (double) atoi (argv[c++]);
507
508 if (c == argc)
509 return validate_arguments ();
510 if (crit_size_bytes == 0 && is_intnonneg (argv[c]))
511 crit_size_bytes = (double) atoi (argv[c++]);
512
513 return validate_arguments ();
514 }
515
516
517
518 int
validate_arguments(void)519 validate_arguments (void)
520 {
521 if (have_crit == FALSE && have_warn == FALSE)
522 return ERROR;
523 else if (warn_percent < 0 || crit_percent < 0 || warn_size_bytes < 0
524 || crit_size_bytes < 0) {
525 return ERROR;
526 }
527 else if (warn_percent < crit_percent) {
528 usage4
529 (_("Warning percentage should be more than critical percentage"));
530 }
531 else if (warn_size_bytes < crit_size_bytes) {
532 usage4
533 (_("Warning free space should be more than critical free space"));
534 }
535 return OK;
536 }
537
538
539
540 void
print_help(void)541 print_help (void)
542 {
543 print_revision (progname, NP_VERSION);
544
545 printf (_(COPYRIGHT), copyright, email);
546
547 printf ("%s\n", _("Check swap space on local machine."));
548
549 printf ("\n\n");
550
551 print_usage ();
552
553 printf (UT_HELP_VRSN);
554 printf (UT_EXTRA_OPTS);
555
556 printf (" %s\n", "-w, --warning=INTEGER");
557 printf (" %s\n", _("Exit with WARNING status if less than INTEGER bytes of swap space are free"));
558 printf (" %s\n", "-w, --warning=PERCENT%%");
559 printf (" %s\n", _("Exit with WARNING status if less than PERCENT of swap space is free"));
560 printf (" %s\n", "-c, --critical=INTEGER");
561 printf (" %s\n", _("Exit with CRITICAL status if less than INTEGER bytes of swap space are free"));
562 printf (" %s\n", "-c, --critical=PERCENT%%");
563 printf (" %s\n", _("Exit with CRITICAL status if less than PERCENT of swap space is free"));
564 printf (" %s\n", "-a, --allswaps");
565 printf (" %s\n", _("Conduct comparisons for all swap partitions, one by one"));
566 printf (" %s\n", "-n, --no-swap=<ok|warning|critical|unknown>");
567 printf (" %s %s\n", _("Resulting state when there is no swap regardless of thresholds. Default:"), state_text(no_swap_state));
568
569 printf (UT_VERBOSE);
570
571 printf ("\n");
572 printf ("%s\n", _("Notes:"));
573 printf (" %s\n", _("Both INTEGER and PERCENT thresholds can be specified, they are all checked."));
574 printf (" %s\n", _("On AIX, if -a is specified, uses lsps -a, otherwise uses lsps -s."));
575
576 printf (UT_SUPPORT);
577 }
578
579
580 void
print_usage(void)581 print_usage (void)
582 {
583 printf ("%s\n", _("Usage:"));
584 printf (" %s [-av] -w <percent_free>%% -c <percent_free>%%\n",progname);
585 printf (" -w <bytes_free> -c <bytes_free> [-n <state>]\n");
586 }
587