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Sourcecode: nagios-plugins version File versions

check_swap.c

/******************************************************************************
 *
 * Program: Swap space plugin for Nagios
 * License: GPL
 *
 * License Information:
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 * Copyright (c) 2000 Karl DeBisschop (kdebisschop@users.sourceforge.net)
 *
 * $Id: check_swap.c,v 1.47 2005/01/19 21:14:47 tonvoon Exp $
 *
 *****************************************************************************/

const char *progname = "check_swap";
const char *revision = "$Revision: 1.47 $";
const char *copyright = "2000-2004";
const char *email = "nagiosplug-devel@lists.sourceforge.net";

#include "common.h"
#include "popen.h"
#include "utils.h"

int check_swap (int usp, float free_swap);
int process_arguments (int argc, char **argv);
int validate_arguments (void);
void print_usage (void);
void print_help (void);

int warn_percent = 0;
int crit_percent = 0;
float warn_size = 0;
float crit_size = 0;
int verbose;
int allswaps;

int
main (int argc, char **argv)
{
      int percent_used, percent;
      float total_swap = 0, used_swap = 0, free_swap = 0;
      float dsktotal = 0, dskused = 0, dskfree = 0, tmp = 0;
      int result = STATE_UNKNOWN;
      char input_buffer[MAX_INPUT_BUFFER];
      char *perf;
#ifdef HAVE_PROC_MEMINFO
      FILE *fp;
#else
      int conv_factor = SWAP_CONVERSION;
# ifdef HAVE_SWAP
      char *temp_buffer;
      char *swap_command;
      char *swap_format;
# else
#  ifdef HAVE_DECL_SWAPCTL
      int i=0, nswaps=0, swapctl_res=0;
#   ifdef CHECK_SWAP_SWAPCTL_SVR4
      swaptbl_t *tbl=NULL;
      swapent_t *ent=NULL;
#   else
#    ifdef CHECK_SWAP_SWAPCTL_BSD
      struct swapent *ent;
#    endif /* CHECK_SWAP_SWAPCTL_BSD */
#   endif /* CHECK_SWAP_SWAPCTL_SVR4 */
#  endif /* HAVE_DECL_SWAPCTL */
# endif
#endif
      char str[32];
      char *status, *tmp_status;

      setlocale (LC_ALL, "");
      bindtextdomain (PACKAGE, LOCALEDIR);
      textdomain (PACKAGE);

      status = strdup ("");
      tmp_status = strdup ("");
      perf = strdup ("");

      if (process_arguments (argc, argv) == ERROR)
            usage4 (_("Could not parse arguments"));

#ifdef HAVE_PROC_MEMINFO
      fp = fopen (PROC_MEMINFO, "r");
      while (fgets (input_buffer, MAX_INPUT_BUFFER - 1, fp)) {
            if (sscanf (input_buffer, "%*[S]%*[w]%*[a]%*[p]%*[:] %f %f %f", &dsktotal, &dskused, &dskfree) == 3) {
                  dsktotal = dsktotal / 1048576;
                  dskused = dskused / 1048576;
                  dskfree = dskfree / 1048576;
                  total_swap += dsktotal;
                  used_swap += dskused;
                  free_swap += dskfree;
                  if (allswaps) {
                        if (dsktotal == 0)
                              percent=100.0;
                        else
                              percent = 100 * (((double) dskused) / ((double) dsktotal));
                        result = max_state (result, check_swap (percent, dskfree));
                        if (verbose)
                              asprintf (&status, "%s [%.0f (%d%%)]", status, dskfree, 100 - percent);
                  }
            }
            else if (sscanf (input_buffer, "%*[S]%*[w]%*[a]%*[p]%[TotalFre]%*[:] %f %*[k]%*[B]", str, &tmp)) {
                  if (strcmp ("Total", str) == 0) {
                        dsktotal = tmp / 1024;
                  }
                  else if (strcmp ("Free", str) == 0) {
                        dskfree = tmp / 1024;
                  }
            }
      }
      fclose(fp);
      dskused = dsktotal - dskfree;
      total_swap = dsktotal;
      used_swap = dskused;
      free_swap = dskfree;
#else
# ifdef HAVE_SWAP
      asprintf(&swap_command, "%s", SWAP_COMMAND);
      asprintf(&swap_format, "%s", SWAP_FORMAT);

/* These override the command used if a summary (and thus ! allswaps) is required */
/* The summary flag returns more accurate information about swap usage on these OSes */
#  ifdef _AIX
      if (!allswaps) {
            asprintf(&swap_command, "%s", "/usr/sbin/lsps -s");
            asprintf(&swap_format, "%s", "%f%*s %f");
            conv_factor = 1;
      }
#  endif

      if (verbose >= 2)
            printf (_("Command: %s\n"), swap_command);
      if (verbose >= 3)
            printf (_("Format: %s\n"), swap_format);

      child_process = spopen (swap_command);
      if (child_process == NULL) {
            printf (_("Could not open pipe: %s\n"), swap_command);
            return STATE_UNKNOWN;
      }

      child_stderr = fdopen (child_stderr_array[fileno (child_process)], "r");
      if (child_stderr == NULL)
            printf (_("Could not open stderr for %s\n"), swap_command);

      sprintf (str, "%s", "");
      /* read 1st line */
      fgets (input_buffer, MAX_INPUT_BUFFER - 1, child_process);
      if (strcmp (swap_format, "") == 0) {
            temp_buffer = strtok (input_buffer, " \n");
            while (temp_buffer) {
                  if (strstr (temp_buffer, "blocks"))
                        sprintf (str, "%s %s", str, "%f");
                  else if (strstr (temp_buffer, "dskfree"))
                        sprintf (str, "%s %s", str, "%f");
                  else
                        sprintf (str, "%s %s", str, "%*s");
                  temp_buffer = strtok (NULL, " \n");
            }
      }

/* If different swap command is used for summary switch, need to read format differently */
#  ifdef _AIX
      if (!allswaps) {
            fgets(input_buffer, MAX_INPUT_BUFFER - 1, child_process);   /* Ignore first line */
            sscanf (input_buffer, swap_format, &total_swap, &used_swap);
            free_swap = total_swap * (100 - used_swap) /100;
            used_swap = total_swap - free_swap;
            if (verbose >= 3)
                  printf (_("total=%.0f, used=%.0f, free=%.0f\n"), total_swap, used_swap, free_swap);
      } else {
#  endif
            while (fgets (input_buffer, MAX_INPUT_BUFFER - 1, child_process)) {
                  sscanf (input_buffer, swap_format, &dsktotal, &dskfree);

                  dsktotal = dsktotal / conv_factor;
                  /* AIX lists percent used, so this converts to dskfree in MBs */
#  ifdef _AIX
                  dskfree = dsktotal * (100 - dskfree) / 100;
#  else
                  dskfree = dskfree / conv_factor;
#  endif
                  if (verbose >= 3)
                        printf (_("total=%.0f, free=%.0f\n"), dsktotal, dskfree);

                  dskused = dsktotal - dskfree;
                  total_swap += dsktotal;
                  used_swap += dskused;
                  free_swap += dskfree;
                  if (allswaps) {
                        percent = 100 * (((double) dskused) / ((double) dsktotal));
                        result = max_state (result, check_swap (percent, dskfree));
                        if (verbose)
                              asprintf (&status, "%s [%.0f (%d%%)]", status, dskfree, 100 - percent);
                  }
            }
#  ifdef _AIX
      }
#  endif

      /* If we get anything on STDERR, at least set warning */
      while (fgets (input_buffer, MAX_INPUT_BUFFER - 1, child_stderr))
            result = max_state (result, STATE_WARNING);

      /* close stderr */
      (void) fclose (child_stderr);

      /* close the pipe */
      if (spclose (child_process))
            result = max_state (result, STATE_WARNING);
# else
#  ifdef CHECK_SWAP_SWAPCTL_SVR4

      /* get the number of active swap devices */
      nswaps=swapctl(SC_GETNSWP, NULL);

      /* initialize swap table + entries */
      tbl=(swaptbl_t*)malloc(sizeof(swaptbl_t)+(sizeof(swapent_t)*nswaps));
      memset(tbl, 0, sizeof(swaptbl_t)+(sizeof(swapent_t)*nswaps));
      tbl->swt_n=nswaps;
      for(i=0;i<nswaps;i++){
            ent=&tbl->swt_ent[i];
            ent->ste_path=(char*)malloc(sizeof(char)*MAXPATHLEN);
      }

      /* and now, tally 'em up */
      swapctl_res=swapctl(SC_LIST, tbl);
      if(swapctl_res < 0){
            perror(_("swapctl failed: "));
            result = STATE_WARNING;
      }

      for(i=0;i<nswaps;i++){
            dsktotal = (float) tbl->swt_ent[i].ste_pages / SWAP_CONVERSION;
            dskfree = (float) tbl->swt_ent[i].ste_free /  SWAP_CONVERSION;
            dskused = ( dsktotal - dskfree );

            if (verbose >= 3)
                  printf ("dsktotal=%.0f dskfree=%.0f dskused=%.0f\n", dsktotal, dskfree, dskused);

            if(allswaps && dsktotal > 0){
                  percent = 100 * (((double) dskused) / ((double) dsktotal));
                  result = max_state (result, check_swap (percent, dskfree));
                  if (verbose) {
                        asprintf (&status, "%s [%.0f (%d%%)]", status, dskfree, 100 - percent);
                  }
            }

            total_swap += dsktotal;
            free_swap += dskfree;
            used_swap += dskused;
      }

      /* and clean up after ourselves */
      for(i=0;i<nswaps;i++){
            free(tbl->swt_ent[i].ste_path);
      }
      free(tbl);
#  else
#   ifdef CHECK_SWAP_SWAPCTL_BSD

      /* get the number of active swap devices */
      nswaps=swapctl(SWAP_NSWAP, NULL, 0);

      /* initialize swap table + entries */
      ent=(struct swapent*)malloc(sizeof(struct swapent)*nswaps);

      /* and now, tally 'em up */
      swapctl_res=swapctl(SWAP_STATS, ent, nswaps);
      if(swapctl_res < 0){
            perror(_("swapctl failed: "));
            result = STATE_WARNING;
      }

      for(i=0;i<nswaps;i++){
            dsktotal = (float) ent->se_nblks / conv_factor;
            dskused = (float) ent->se_inuse / conv_factor;
            dskfree = ( dsktotal - dskused );

            if(allswaps && dsktotal > 0){
                  percent = 100 * (((double) dskused) / ((double) dsktotal));
                  result = max_state (result, check_swap (percent, dskfree));
                  if (verbose) {
                        asprintf (&status, "%s [%.0f (%d%%)]", status, dskfree, 100 - percent);
                  }
            }

            total_swap += dsktotal;
            free_swap += dskfree;
            used_swap += dskused;
      }

      /* and clean up after ourselves */
      free(ent);

#   endif /* CHECK_SWAP_SWAPCTL_BSD */
#  endif /* CHECK_SWAP_SWAPCTL_SVR4 */
# endif /* HAVE_SWAP */
#endif /* HAVE_PROC_MEMINFO */

      percent_used = 100 * ((double) used_swap) / ((double) total_swap);
      result = max_state (result, check_swap (percent_used, free_swap));
      /* broken into two steps because of funkiness with builtin asprintf */
      asprintf (&tmp_status, _(" %d%% free (%.0f MB out of %.0f MB)"),
                                    (100 - percent_used), free_swap, total_swap);
      asprintf (&status, "%s%s", tmp_status, status);

      asprintf (&perf, "%s", perfdata ("swap", (long) free_swap, "MB",
            TRUE, (long) max (warn_size/1024, warn_percent/100.0*total_swap),
            TRUE, (long) max (crit_size/1024, crit_percent/100.0*total_swap),
            TRUE, 0,
            TRUE, (long) total_swap));
      printf ("SWAP %s:%s |%s\n", state_text (result), status, perf);
      return result;
}



int
check_swap (int usp, float free_swap)
{
      int result = STATE_UNKNOWN;
      free_swap = free_swap * 1024;       /* Convert back to bytes as warn and crit specified in bytes */
      if (usp >= 0 && crit_percent != 0 && usp >= (100.0 - crit_percent))
            result = STATE_CRITICAL;
      else if (crit_size > 0 && free_swap <= crit_size)
            result = STATE_CRITICAL;
      else if (usp >= 0 && warn_percent != 0 && usp >= (100.0 - warn_percent))
            result = STATE_WARNING;
      else if (warn_size > 0 && free_swap <= warn_size)
            result = STATE_WARNING;
      else if (usp >= 0.0)
            result = STATE_OK;
      return result;
}



/* process command-line arguments */
int
process_arguments (int argc, char **argv)
{
      int c = 0;  /* option character */

      int option = 0;
      static struct option longopts[] = {
            {"warning", required_argument, 0, 'w'},
            {"critical", required_argument, 0, 'c'},
            {"allswaps", no_argument, 0, 'a'},
            {"verbose", no_argument, 0, 'v'},
            {"version", no_argument, 0, 'V'},
            {"help", no_argument, 0, 'h'},
            {0, 0, 0, 0}
      };

      if (argc < 2)
            return ERROR;

      while (1) {
            c = getopt_long (argc, argv, "+?Vvhac:w:", longopts, &option);

            if (c == -1 || c == EOF)
                  break;

            switch (c) {
            case 'w':                                                   /* warning size threshold */
                  if (is_intnonneg (optarg)) {
                        warn_size = (float) atoi (optarg);
                        break;
                  }
                  else if (strstr (optarg, ",") &&
                                           strstr (optarg, "%") &&
                                           sscanf (optarg, "%.0f,%d%%", &warn_size, &warn_percent) == 2) {
                        break;
                  }
                  else if (strstr (optarg, "%") &&
                                           sscanf (optarg, "%d%%", &warn_percent) == 1) {
                        break;
                  }
                  else {
                        usage4 (_("Warning threshold must be integer or percentage!"));
                  }
            case 'c':                                                   /* critical size threshold */
                  if (is_intnonneg (optarg)) {
                        crit_size = (float) atoi (optarg);
                        break;
                  }
                  else if (strstr (optarg, ",") &&
                                           strstr (optarg, "%") &&
                                           sscanf (optarg, "%.0f,%d%%", &crit_size, &crit_percent) == 2) {
                        break;
                  }
                  else if (strstr (optarg, "%") &&
                                           sscanf (optarg, "%d%%", &crit_percent) == 1) {
                        break;
                  }
                  else {
                        usage4 (_("Critical threshold must be integer or percentage!"));
                  }
            case 'a':                                                   /* all swap */
                  allswaps = TRUE;
                  break;
            case 'v':                                                   /* verbose */
                  verbose++;
                  break;
            case 'V':                                                   /* version */
                  print_revision (progname, revision);
                  exit (STATE_OK);
            case 'h':                                                   /* help */
                  print_help ();
                  exit (STATE_OK);
            case '?':                                                   /* error */
                  usage2 (_("Unknown argument"), optarg);
            }
      }

      c = optind;
      if (c == argc)
            return validate_arguments ();
      if (warn_percent == 0 && is_intnonneg (argv[c]))
            warn_percent = atoi (argv[c++]);

      if (c == argc)
            return validate_arguments ();
      if (crit_percent == 0 && is_intnonneg (argv[c]))
            crit_percent = atoi (argv[c++]);

      if (c == argc)
            return validate_arguments ();
      if (warn_size == 0 && is_intnonneg (argv[c]))
            warn_size = (float) atoi (argv[c++]);

      if (c == argc)
            return validate_arguments ();
      if (crit_size == 0 && is_intnonneg (argv[c]))
            crit_size = atoi (argv[c++]);

      return validate_arguments ();
}



int
validate_arguments (void)
{
      if (warn_percent == 0 && crit_percent == 0 && warn_size == 0
                  && crit_size == 0) {
            return ERROR;
      }
      else if (warn_percent < crit_percent) {
            usage4 
                  (_("Warning percentage should be more than critical percentage"));
      }
      else if (warn_size < crit_size) {
            usage4
                  (_("Warning free space should be more than critical free space"));
      }
      return OK;
}



void
print_help (void)
{
      print_revision (progname, revision);

      printf (_(COPYRIGHT), copyright, email);

      printf (_("Check swap space on local machine.\n\n"));

      print_usage ();

      printf (_(UT_HELP_VRSN));

      printf (_("\n\
 -w, --warning=INTEGER\n\
   Exit with WARNING status if less than INTEGER bytes of swap space are free\n\
 -w, --warning=PERCENT%%\n\
   Exit with WARNING status if less than PERCENT of swap space is free\n\
 -c, --critical=INTEGER\n\
   Exit with CRITICAL status if less than INTEGER bytes of swap space are free\n\
 -c, --critical=PERCENT%%\n\
   Exit with CRITCAL status if less than PERCENT of swap space is free\n\
 -a, --allswaps\n\
    Conduct comparisons for all swap partitions, one by one\n\
 -v, --verbose\n\
    Verbose output. Up to 3 levels\n"));

      printf (_("\n\
On Solaris, if -a specified, uses swap -l, otherwise uses swap -s.\n\
Will be discrepencies because swap -s counts allocated swap and includes\n\
real memory\n"));
      printf (_("\n\
On AIX, if -a is specified, uses lsps -a, otherwise uses lsps -s.\n"));

      printf (_(UT_SUPPORT));
}



void
print_usage (void)
{
      printf ("\
Usage: %s [-av] -w <percent_free>%% -c <percent_free>%%\n\
       %s [-av] -w <bytes_free> -c <bytes_free>\n", progname, progname);
}

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