plugins/check_swap.c

   1 /*****************************************************************************
   2 *
   3 * Nagios check_disk plugin
   4 *
   5 * License: GPL
   6 * Copyright (c) 2000 Karl DeBisschop (kdebisschop@users.sourceforge.net)
   7 * Copyright (c) 2000-2007 Nagios Plugins Development Team
   8 *
   9 * Description:
  10 *
  11 * This file contains the check_disk 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 = "2000-2007";
  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, float 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 warn_percent = 0;
  61 int crit_percent = 0;
  62 float warn_size_bytes = 0;
  63 float crit_size_bytes= 0;
  64 int verbose;
  65 int allswaps;
  66
  67 int
  68 main (int argc, char **argv)
  69 {
  70         int percent_used, percent;
  71         float total_swap_mb = 0, used_swap_mb = 0, free_swap_mb = 0;
  72         float dsktotal_mb = 0, dskused_mb = 0, dskfree_mb = 0, tmp_mb = 0;
  73         int result = STATE_UNKNOWN;
  74         char input_buffer[MAX_INPUT_BUFFER];
  75 #ifdef HAVE_PROC_MEMINFO
  76         FILE *fp;
  77 #else
  78         int conv_factor = SWAP_CONVERSION;
  79 # ifdef HAVE_SWAP
  80         char *temp_buffer;
  81         char *swap_command;
  82         char *swap_format;
  83 # else
  84 #  ifdef HAVE_DECL_SWAPCTL
  85         int i=0, nswaps=0, swapctl_res=0;
  86 #   ifdef CHECK_SWAP_SWAPCTL_SVR4
  87         swaptbl_t *tbl=NULL;
  88         swapent_t *ent=NULL;
  89 #   else
  90 #    ifdef CHECK_SWAP_SWAPCTL_BSD
  91         struct swapent *ent;
  92 #    endif /* CHECK_SWAP_SWAPCTL_BSD */
  93 #   endif /* CHECK_SWAP_SWAPCTL_SVR4 */
  94 #  endif /* HAVE_DECL_SWAPCTL */
  95 # endif
  96 #endif
  97         char str[32];
  98         char *status;
  99
 100         setlocale (LC_ALL, "");
 101         bindtextdomain (PACKAGE, LOCALEDIR);
 102         textdomain (PACKAGE);
 103
 104         status = strdup ("");
 105
 106         /* Parse extra opts if any */
 107         argv=np_extra_opts (&argc, argv, progname);
 108
 109         if (process_arguments (argc, argv) == ERROR)
 110                 usage4 (_("Could not parse arguments"));
 111
 112 #ifdef HAVE_PROC_MEMINFO
 113         if (verbose >= 3) {
 114                 printf("Reading PROC_MEMINFO at %s\n", PROC_MEMINFO);
 115         }
 116         fp = fopen (PROC_MEMINFO, "r");
 117         while (fgets (input_buffer, MAX_INPUT_BUFFER - 1, fp)) {
 118                 if (sscanf (input_buffer, "%*[S]%*[w]%*[a]%*[p]%*[:] %f %f %f", &dsktotal_mb, &dskused_mb, &dskfree_mb) == 3) {
 119                         dsktotal_mb = dsktotal_mb / 1048576;    /* Apply conversion */
 120                         dskused_mb = dskused_mb / 1048576;
 121                         dskfree_mb = dskfree_mb / 1048576;
 122                         total_swap_mb += dsktotal_mb;
 123                         used_swap_mb += dskused_mb;
 124                         free_swap_mb += dskfree_mb;
 125                         if (allswaps) {
 126                                 if (dsktotal_mb == 0)
 127                                         percent=100.0;
 128                                 else
 129                                         percent = 100 * (((double) dskused_mb) / ((double) dsktotal_mb));
 130                                 result = max_state (result, check_swap (percent, dskfree_mb));
 131                                 if (verbose)
 132                                         xasprintf (&status, "%s [%.0f (%d%%)]", status, dskfree_mb, 100 - percent);
 133                         }
 134                 }
 135                 else if (sscanf (input_buffer, "%*[S]%*[w]%*[a]%*[p]%[TotalFre]%*[:] %f %*[k]%*[B]", str, &tmp_mb)) {
 136                         if (verbose >= 3) {
 137                                 printf("Got %s with %f\n", str, tmp_mb);
 138                         }
 139                         /* I think this part is always in Kb, so convert to mb */
 140                         if (strcmp ("Total", str) == 0) {
 141                                 dsktotal_mb = tmp_mb / 1024;
 142                         }
 143                         else if (strcmp ("Free", str) == 0) {
 144                                 dskfree_mb = tmp_mb / 1024;
 145                         }
 146                 }
 147         }
 148         fclose(fp);
 149         dskused_mb = dsktotal_mb - dskfree_mb;
 150         total_swap_mb = dsktotal_mb;
 151         used_swap_mb = dskused_mb;
 152         free_swap_mb = dskfree_mb;
 153 #else
 154 # ifdef HAVE_SWAP
 155         xasprintf(&swap_command, "%s", SWAP_COMMAND);
 156         xasprintf(&swap_format, "%s", SWAP_FORMAT);
 157
 158 /* These override the command used if a summary (and thus ! allswaps) is required */
 159 /* The summary flag returns more accurate information about swap usage on these OSes */
 160 #  ifdef _AIX
 161         if (!allswaps) {
 162                 xasprintf(&swap_command, "%s", "/usr/sbin/lsps -s");
 163                 xasprintf(&swap_format, "%s", "%f%*s %f");
 164                 conv_factor = 1;
 165         }
 166 #  endif
 167
 168         if (verbose >= 2)
 169                 printf (_("Command: %s\n"), swap_command);
 170         if (verbose >= 3)
 171                 printf (_("Format: %s\n"), swap_format);
 172
 173         child_process = spopen (swap_command);
 174         if (child_process == NULL) {
 175                 printf (_("Could not open pipe: %s\n"), swap_command);
 176                 return STATE_UNKNOWN;
 177         }
 178
 179         child_stderr = fdopen (child_stderr_array[fileno (child_process)], "r");
 180         if (child_stderr == NULL)
 181                 printf (_("Could not open stderr for %s\n"), swap_command);
 182
 183         sprintf (str, "%s", "");
 184         /* read 1st line */
 185         fgets (input_buffer, MAX_INPUT_BUFFER - 1, child_process);
 186         if (strcmp (swap_format, "") == 0) {
 187                 temp_buffer = strtok (input_buffer, " \n");
 188                 while (temp_buffer) {
 189                         if (strstr (temp_buffer, "blocks"))
 190                                 sprintf (str, "%s %s", str, "%f");
 191                         else if (strstr (temp_buffer, "dskfree"))
 192                                 sprintf (str, "%s %s", str, "%f");
 193                         else
 194                                 sprintf (str, "%s %s", str, "%*s");
 195                         temp_buffer = strtok (NULL, " \n");
 196                 }
 197         }
 198
 199 /* If different swap command is used for summary switch, need to read format differently */
 200 #  ifdef _AIX
 201         if (!allswaps) {
 202                 fgets(input_buffer, MAX_INPUT_BUFFER - 1, child_process);       /* Ignore first line */
 203                 sscanf (input_buffer, swap_format, &total_swap_mb, &used_swap_mb);
 204                 free_swap_mb = total_swap_mb * (100 - used_swap_mb) /100;
 205                 used_swap_mb = total_swap_mb - free_swap_mb;
 206                 if (verbose >= 3)
 207                         printf (_("total=%.0f, used=%.0f, free=%.0f\n"), total_swap_mb, used_swap_mb, free_swap_mb);
 208         } else {
 209 #  endif
 210                 while (fgets (input_buffer, MAX_INPUT_BUFFER - 1, child_process)) {
 211                         sscanf (input_buffer, swap_format, &dsktotal_mb, &dskfree_mb);
 212
 213                         dsktotal_mb = dsktotal_mb / conv_factor;
 214                         /* AIX lists percent used, so this converts to dskfree in MBs */
 215 #  ifdef _AIX
 216                         dskfree_mb = dsktotal_mb * (100 - dskfree_mb) / 100;
 217 #  else
 218                         dskfree_mb = dskfree_mb / conv_factor;
 219 #  endif
 220                         if (verbose >= 3)
 221                                 printf (_("total=%.0f, free=%.0f\n"), dsktotal_mb, dskfree_mb);
 222
 223                         dskused_mb = dsktotal_mb - dskfree_mb;
 224                         total_swap_mb += dsktotal_mb;
 225                         used_swap_mb += dskused_mb;
 226                         free_swap_mb += dskfree_mb;
 227                         if (allswaps) {
 228                                 percent = 100 * (((double) dskused_mb) / ((double) dsktotal_mb));
 229                                 result = max_state (result, check_swap (percent, dskfree_mb));
 230                                 if (verbose)
 231                                         xasprintf (&status, "%s [%.0f (%d%%)]", status, dskfree_mb, 100 - percent);
 232                         }
 233                 }
 234 #  ifdef _AIX
 235         }
 236 #  endif
 237
 238         /* If we get anything on STDERR, at least set warning */
 239         while (fgets (input_buffer, MAX_INPUT_BUFFER - 1, child_stderr))
 240                 result = max_state (result, STATE_WARNING);
 241
 242         /* close stderr */
 243         (void) fclose (child_stderr);
 244
 245         /* close the pipe */
 246         if (spclose (child_process))
 247                 result = max_state (result, STATE_WARNING);
 248 # else
 249 #  ifdef CHECK_SWAP_SWAPCTL_SVR4
 250
 251         /* get the number of active swap devices */
 252         if((nswaps=swapctl(SC_GETNSWP, NULL))== -1)
 253                 die(STATE_UNKNOWN, _("Error getting swap devices\n") );
 254
 255         if(nswaps == 0)
 256                 die(STATE_OK, _("SWAP OK: No swap devices defined\n"));
 257
 258         if(verbose >= 3)
 259                 printf("Found %d swap device(s)\n", nswaps);
 260
 261         /* initialize swap table + entries */
 262         tbl=(swaptbl_t*)malloc(sizeof(swaptbl_t)+(sizeof(swapent_t)*nswaps));
 263
 264         if(tbl==NULL)
 265                 die(STATE_UNKNOWN, _("malloc() failed!\n"));
 266
 267         memset(tbl, 0, sizeof(swaptbl_t)+(sizeof(swapent_t)*nswaps));
 268         tbl->swt_n=nswaps;
 269         for(i=0;i<nswaps;i++){
 270                 if((tbl->swt_ent[i].ste_path=(char*)malloc(sizeof(char)*MAXPATHLEN)) == NULL)
 271                         die(STATE_UNKNOWN, _("malloc() failed!\n"));
 272         }
 273
 274         /* and now, tally 'em up */
 275         swapctl_res=swapctl(SC_LIST, tbl);
 276         if(swapctl_res < 0){
 277                 perror(_("swapctl failed: "));
 278                 die(STATE_UNKNOWN, _("Error in swapctl call\n"));
 279         }
 280
 281         for(i=0;i<nswaps;i++){
 282                 dsktotal_mb = (float) tbl->swt_ent[i].ste_pages / SWAP_CONVERSION;
 283                 dskfree_mb = (float) tbl->swt_ent[i].ste_free /  SWAP_CONVERSION;
 284                 dskused_mb = ( dsktotal_mb - dskfree_mb );
 285
 286                 if (verbose >= 3)
 287                         printf ("dsktotal_mb=%.0f dskfree_mb=%.0f dskused_mb=%.0f\n", dsktotal_mb, dskfree_mb, dskused_mb);
 288
 289                 if(allswaps && dsktotal_mb > 0){
 290                         percent = 100 * (((double) dskused_mb) / ((double) dsktotal_mb));
 291                         result = max_state (result, check_swap (percent, dskfree_mb));
 292                         if (verbose) {
 293                                 xasprintf (&status, "%s [%.0f (%d%%)]", status, dskfree_mb, 100 - percent);
 294                         }
 295                 }
 296
 297                 total_swap_mb += dsktotal_mb;
 298                 free_swap_mb += dskfree_mb;
 299                 used_swap_mb += dskused_mb;
 300         }
 301
 302         /* and clean up after ourselves */
 303         for(i=0;i<nswaps;i++){
 304                 free(tbl->swt_ent[i].ste_path);
 305         }
 306         free(tbl);
 307 #  else
 308 #   ifdef CHECK_SWAP_SWAPCTL_BSD
 309
 310         /* get the number of active swap devices */
 311         nswaps=swapctl(SWAP_NSWAP, NULL, 0);
 312
 313         /* initialize swap table + entries */
 314         ent=(struct swapent*)malloc(sizeof(struct swapent)*nswaps);
 315
 316         /* and now, tally 'em up */
 317         swapctl_res=swapctl(SWAP_STATS, ent, nswaps);
 318         if(swapctl_res < 0){
 319                 perror(_("swapctl failed: "));
 320                 die(STATE_UNKNOWN, _("Error in swapctl call\n"));
 321         }
 322
 323         for(i=0;i<nswaps;i++){
 324                 dsktotal_mb = (float) ent[i].se_nblks / conv_factor;
 325                 dskused_mb = (float) ent[i].se_inuse / conv_factor;
 326                 dskfree_mb = ( dsktotal_mb - dskused_mb );
 327
 328                 if(allswaps && dsktotal_mb > 0){
 329                         percent = 100 * (((double) dskused_mb) / ((double) dsktotal_mb));
 330                         result = max_state (result, check_swap (percent, dskfree_mb));
 331                         if (verbose) {
 332                                 xasprintf (&status, "%s [%.0f (%d%%)]", status, dskfree_mb, 100 - percent);
 333                         }
 334                 }
 335
 336                 total_swap_mb += dsktotal_mb;
 337                 free_swap_mb += dskfree_mb;
 338                 used_swap_mb += dskused_mb;
 339         }
 340
 341         /* and clean up after ourselves */
 342         free(ent);
 343
 344 #   endif /* CHECK_SWAP_SWAPCTL_BSD */
 345 #  endif /* CHECK_SWAP_SWAPCTL_SVR4 */
 346 # endif /* HAVE_SWAP */
 347 #endif /* HAVE_PROC_MEMINFO */
 348
 349         /* if total_swap_mb == 0, let's not divide by 0 */
 350         if(total_swap_mb) {
 351                 percent_used = 100 * ((double) used_swap_mb) / ((double) total_swap_mb);
 352         } else {
 353                 percent_used = 0;
 354         }
 355
 356         result = max_state (result, check_swap (percent_used, free_swap_mb));
 357         printf (_("SWAP %s - %d%% free (%d MB out of %d MB) %s|"),
 358                         state_text (result),
 359                         (100 - percent_used), (int) free_swap_mb, (int) total_swap_mb, status);
 360
 361         puts (perfdata ("swap", (long) free_swap_mb, "MB",
 362                         TRUE, (long) max (warn_size_bytes/(1024 * 1024), warn_percent/100.0*total_swap_mb),
 363                         TRUE, (long) max (crit_size_bytes/(1024 * 1024), crit_percent/100.0*total_swap_mb),
 364                         TRUE, 0,
 365                         TRUE, (long) total_swap_mb));
 366
 367         return result;
 368 }
 369
 370
 371
 372 int
 373 check_swap (int usp, float free_swap_mb)
 374 {
 375         int result = STATE_UNKNOWN;
 376         float free_swap = free_swap_mb * (1024 * 1024);         /* Convert back to bytes as warn and crit specified in bytes */
 377         if (usp >= 0 && crit_percent != 0 && usp >= (100.0 - crit_percent))
 378                 result = STATE_CRITICAL;
 379         else if (crit_size_bytes > 0 && free_swap <= crit_size_bytes)
 380                 result = STATE_CRITICAL;
 381         else if (usp >= 0 && warn_percent != 0 && usp >= (100.0 - warn_percent))
 382                 result = STATE_WARNING;
 383         else if (warn_size_bytes > 0 && free_swap <= warn_size_bytes)
 384                 result = STATE_WARNING;
 385         else if (usp >= 0.0)
 386                 result = STATE_OK;
 387         return result;
 388 }
 389
 390
 391
 392 /* process command-line arguments */
 393 int
 394 process_arguments (int argc, char **argv)
 395 {
 396         int c = 0;  /* option character */
 397
 398         int option = 0;
 399         static struct option longopts[] = {
 400                 {"warning", required_argument, 0, 'w'},
 401                 {"critical", required_argument, 0, 'c'},
 402                 {"allswaps", no_argument, 0, 'a'},
 403                 {"verbose", no_argument, 0, 'v'},
 404                 {"version", no_argument, 0, 'V'},
 405                 {"help", no_argument, 0, 'h'},
 406                 {0, 0, 0, 0}
 407         };
 408
 409         if (argc < 2)
 410                 return ERROR;
 411
 412         while (1) {
 413                 c = getopt_long (argc, argv, "+?Vvhac:w:", longopts, &option);
 414
 415                 if (c == -1 || c == EOF)
 416                         break;
 417
 418                 switch (c) {
 419                 case 'w':                                                                       /* warning size threshold */
 420                         if (is_intnonneg (optarg)) {
 421                                 warn_size_bytes = (float) atoi (optarg);
 422                                 break;
 423                         }
 424                         else if (strstr (optarg, ",") &&
 425                                                          strstr (optarg, "%") &&
 426                                                          sscanf (optarg, "%f,%d%%", &warn_size_bytes, &warn_percent) == 2) {
 427                                 warn_size_bytes = floorf(warn_size_bytes);
 428                                 break;
 429                         }
 430                         else if (strstr (optarg, "%") &&
 431                                                          sscanf (optarg, "%d%%", &warn_percent) == 1) {
 432                                 break;
 433                         }
 434                         else {
 435                                 usage4 (_("Warning threshold must be integer or percentage!"));
 436                         }
 437                 case 'c':                                                                       /* critical size threshold */
 438                         if (is_intnonneg (optarg)) {
 439                                 crit_size_bytes = (float) atoi (optarg);
 440                                 break;
 441                         }
 442                         else if (strstr (optarg, ",") &&
 443                                                          strstr (optarg, "%") &&
 444                                                          sscanf (optarg, "%f,%d%%", &crit_size_bytes, &crit_percent) == 2) {
 445                                 crit_size_bytes = floorf(crit_size_bytes);
 446                                 break;
 447                         }
 448                         else if (strstr (optarg, "%") &&
 449                                                          sscanf (optarg, "%d%%", &crit_percent) == 1) {
 450                                 break;
 451                         }
 452                         else {
 453                                 usage4 (_("Critical threshold must be integer or percentage!"));
 454                         }
 455                 case 'a':                                                                       /* all swap */
 456                         allswaps = TRUE;
 457                         break;
 458                 case 'v':                                                                       /* verbose */
 459                         verbose++;
 460                         break;
 461                 case 'V':                                                                       /* version */
 462                         print_revision (progname, NP_VERSION);
 463                         exit (STATE_OK);
 464                 case 'h':                                                                       /* help */
 465                         print_help ();
 466                         exit (STATE_OK);
 467                 case '?':                                                                       /* error */
 468                         usage5 ();
 469                 }
 470         }
 471
 472         c = optind;
 473         if (c == argc)
 474                 return validate_arguments ();
 475         if (warn_percent == 0 && is_intnonneg (argv[c]))
 476                 warn_percent = atoi (argv[c++]);
 477
 478         if (c == argc)
 479                 return validate_arguments ();
 480         if (crit_percent == 0 && is_intnonneg (argv[c]))
 481                 crit_percent = atoi (argv[c++]);
 482
 483         if (c == argc)
 484                 return validate_arguments ();
 485         if (warn_size_bytes == 0 && is_intnonneg (argv[c]))
 486                 warn_size_bytes = (float) atoi (argv[c++]);
 487
 488         if (c == argc)
 489                 return validate_arguments ();
 490         if (crit_size_bytes == 0 && is_intnonneg (argv[c]))
 491                 crit_size_bytes = (float) atoi (argv[c++]);
 492
 493         return validate_arguments ();
 494 }
 495
 496
 497
 498 int
 499 validate_arguments (void)
 500 {
 501         if (warn_percent == 0 && crit_percent == 0 && warn_size_bytes == 0
 502                         && crit_size_bytes == 0) {
 503                 return ERROR;
 504         }
 505         else if (warn_percent < crit_percent) {
 506                 usage4
 507                         (_("Warning percentage should be more than critical percentage"));
 508         }
 509         else if (warn_size_bytes < crit_size_bytes) {
 510                 usage4
 511                         (_("Warning free space should be more than critical free space"));
 512         }
 513         return OK;
 514 }
 515
 516
 517
 518 void
 519 print_help (void)
 520 {
 521         print_revision (progname, NP_VERSION);
 522
 523         printf (_(COPYRIGHT), copyright, email);
 524
 525         printf ("%s\n", _("Check swap space on local machine."));
 526
 527   printf ("\n\n");
 528
 529         print_usage ();
 530
 531         printf (UT_HELP_VRSN);
 532         printf (UT_EXTRA_OPTS);
 533
 534         printf (" %s\n", "-w, --warning=INTEGER");
 535   printf ("    %s\n", _("Exit with WARNING status if less than INTEGER bytes of swap space are free"));
 536   printf (" %s\n", "-w, --warning=PERCENT%%");
 537   printf ("    %s\n", _("Exit with WARNING status if less than PERCENT of swap space is free"));
 538   printf (" %s\n", "-c, --critical=INTEGER");
 539   printf ("    %s\n", _("Exit with CRITICAL status if less than INTEGER bytes of swap space are free"));
 540   printf (" %s\n", "-c, --critical=PERCENT%%");
 541   printf ("    %s\n", _("Exit with CRITCAL status if less than PERCENT of swap space is free"));
 542   printf (" %s\n", "-a, --allswaps");
 543   printf ("    %s\n", _("Conduct comparisons for all swap partitions, one by one"));
 544         printf (UT_VERBOSE);
 545
 546         printf ("\n");
 547   printf ("%s\n", _("Notes:"));
 548   printf (" %s\n", _("On AIX, if -a is specified, uses lsps -a, otherwise uses lsps -s."));
 549
 550         printf (UT_SUPPORT);
 551 }
 552
 553
 554
 555 void
 556 print_usage (void)
 557 {
 558         printf ("%s\n", _("Usage:"));
 559   printf ("%s [-av] -w <percent_free>%% -c <percent_free>%%\n",progname);
 560   printf ("%s [-av] -w <bytes_free> -c <bytes_free>\n", progname);
 561 }