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pkg-monitoring-plugins/plugins/check_swap.c

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/*****************************************************************************
*
* Monitoring check_swap plugin
*
* License: GPL
* Copyright (c) 2000 Karl DeBisschop (kdebisschop@users.sourceforge.net)
* Copyright (c) 2000-2024 Monitoring Plugins Development Team
*
* Description:
*
* This file contains the check_swap plugin
*
*
* 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 3 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, see <http://www.gnu.org/licenses/>.
*
*
*****************************************************************************/
const char *progname = "check_swap";
const char *copyright = "2000-2024";
const char *email = "devel@monitoring-plugins.org";
#include "common.h"
#include "popen.h"
#include "utils.h"
#ifdef HAVE_DECL_SWAPCTL
# ifdef HAVE_SYS_PARAM_H
# include <sys/param.h>
# endif
# ifdef HAVE_SYS_SWAP_H
# include <sys/swap.h>
# endif
# ifdef HAVE_SYS_STAT_H
# include <sys/stat.h>
# endif
#endif
#ifndef SWAP_CONVERSION
# define SWAP_CONVERSION 1
#endif
typedef struct {
bool is_percentage;
uint64_t value;
} threshold;
int check_swap (float free_swap_mb, float total_swap_mb);
int process_arguments (int argc, char **argv);
int validate_arguments (void);
void print_usage (void);
void print_help (void);
threshold warn;
threshold crit;
int verbose;
bool allswaps = false;
int no_swap_state = STATE_CRITICAL;
int
main (int argc, char **argv)
{
unsigned int percent_used, percent;
uint64_t total_swap_mb = 0, used_swap_mb = 0, free_swap_mb = 0;
uint64_t dsktotal_mb = 0, dskused_mb = 0, dskfree_mb = 0;
uint64_t tmp_KB = 0;
int result = STATE_UNKNOWN;
char input_buffer[MAX_INPUT_BUFFER];
#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;
setlocale (LC_ALL, "");
bindtextdomain (PACKAGE, LOCALEDIR);
textdomain (PACKAGE);
status = strdup ("");
/* Parse extra opts if any */
argv=np_extra_opts (&argc, argv, progname);
if (process_arguments (argc, argv) == ERROR)
usage4 (_("Could not parse arguments"));
#ifdef HAVE_PROC_MEMINFO
if (verbose >= 3) {
printf("Reading PROC_MEMINFO at %s\n", PROC_MEMINFO);
}
fp = fopen (PROC_MEMINFO, "r");
while (fgets (input_buffer, MAX_INPUT_BUFFER - 1, fp)) {
/*
* The following sscanf call looks for a line looking like: "Swap: 123 123 123"
* On which kind of system this format exists, I can not say, but I wanted to
* document this for people who are not adapt with sscanf anymore, like me
*/
if (sscanf (input_buffer, "%*[S]%*[w]%*[a]%*[p]%*[:] %lu %lu %lu", &dsktotal_mb, &dskused_mb, &dskfree_mb) == 3) {
dsktotal_mb = dsktotal_mb / (1024 * 1024); /* Apply conversion */
dskused_mb = dskused_mb / (1024 * 1024);
dskfree_mb = dskfree_mb / (1024 * 1024);
total_swap_mb += dsktotal_mb;
used_swap_mb += dskused_mb;
free_swap_mb += dskfree_mb;
if (allswaps) {
if (dsktotal_mb == 0)
percent=100.0;
else
percent = 100 * (((double) dskused_mb) / ((double) dsktotal_mb));
result = max_state (result, check_swap (dskfree_mb, dsktotal_mb));
if (verbose)
xasprintf (&status, "%s [%lu (%d%%)]", status, dskfree_mb, 100 - percent);
}
}
/*
* The following sscanf call looks for lines looking like: "SwapTotal: 123" and "SwapFree: 123"
* This format exists at least on Debian Linux with a 5.* kernel
*/
else if (sscanf (input_buffer, "%*[S]%*[w]%*[a]%*[p]%[TotalFreCchd]%*[:] %lu %*[k]%*[B]", str, &tmp_KB)) {
if (verbose >= 3) {
printf("Got %s with %lu\n", str, tmp_KB);
}
/* I think this part is always in Kb, so convert to mb */
if (strcmp ("Total", str) == 0) {
dsktotal_mb = tmp_KB / 1024;
}
else if (strcmp ("Free", str) == 0) {
dskfree_mb = dskfree_mb + tmp_KB / 1024;
}
else if (strcmp ("Cached", str) == 0) {
dskfree_mb = dskfree_mb + tmp_KB / 1024;
}
}
}
fclose(fp);
dskused_mb = dsktotal_mb - dskfree_mb;
total_swap_mb = dsktotal_mb;
used_swap_mb = dskused_mb;
free_swap_mb = dskfree_mb;
#else
# ifdef HAVE_SWAP
xasprintf(&swap_command, "%s", SWAP_COMMAND);
xasprintf(&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) {
xasprintf(&swap_command, "%s", "/usr/sbin/lsps -s");
xasprintf(&swap_format, "%s", "%lu%*s %lu");
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, "%lu");
else if (strstr (temp_buffer, "dskfree"))
sprintf (str, "%s %s", str, "%lu");
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_mb, &used_swap_mb);
free_swap_mb = total_swap_mb * (100 - used_swap_mb) /100;
used_swap_mb = total_swap_mb - free_swap_mb;
if (verbose >= 3)
printf (_("total=%.0f, used=%.0f, free=%.0f\n"), total_swap_mb, used_swap_mb, free_swap_mb);
} else {
# endif
while (fgets (input_buffer, MAX_INPUT_BUFFER - 1, child_process)) {
sscanf (input_buffer, swap_format, &dsktotal_mb, &dskfree_mb);
dsktotal_mb = dsktotal_mb / conv_factor;
/* AIX lists percent used, so this converts to dskfree in MBs */
# ifdef _AIX
dskfree_mb = dsktotal_mb * (100 - dskfree_mb) / 100;
# else
dskfree_mb = dskfree_mb / conv_factor;
# endif
if (verbose >= 3)
printf (_("total=%.0f, free=%.0f\n"), dsktotal_mb, dskfree_mb);
dskused_mb = dsktotal_mb - dskfree_mb;
total_swap_mb += dsktotal_mb;
used_swap_mb += dskused_mb;
free_swap_mb += dskfree_mb;
if (allswaps) {
percent = 100 * (((double) dskused_mb) / ((double) dsktotal_mb));
result = max_state (result, check_swap (dskfree_mb, dsktotal_mb));
if (verbose)
xasprintf (&status, "%s [%.0f (%d%%)]", status, dskfree_mb, 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 */
if((nswaps=swapctl(SC_GETNSWP, NULL))== -1)
die(STATE_UNKNOWN, _("Error getting swap devices\n") );
if(nswaps == 0)
die(STATE_OK, _("SWAP OK: No swap devices defined\n"));
if(verbose >= 3)
printf("Found %d swap device(s)\n", nswaps);
/* initialize swap table + entries */
tbl=(swaptbl_t*)malloc(sizeof(swaptbl_t)+(sizeof(swapent_t)*nswaps));
if(tbl==NULL)
die(STATE_UNKNOWN, _("malloc() failed!\n"));
memset(tbl, 0, sizeof(swaptbl_t)+(sizeof(swapent_t)*nswaps));
tbl->swt_n=nswaps;
for(i=0;i<nswaps;i++){
if((tbl->swt_ent[i].ste_path=(char*)malloc(sizeof(char)*MAXPATHLEN)) == NULL)
die(STATE_UNKNOWN, _("malloc() failed!\n"));
}
/* and now, tally 'em up */
swapctl_res=swapctl(SC_LIST, tbl);
if(swapctl_res < 0){
perror(_("swapctl failed: "));
die(STATE_UNKNOWN, _("Error in swapctl call\n"));
}
for(i=0;i<nswaps;i++){
dsktotal_mb = (float) tbl->swt_ent[i].ste_pages / SWAP_CONVERSION;
dskfree_mb = (float) tbl->swt_ent[i].ste_free / SWAP_CONVERSION;
dskused_mb = ( dsktotal_mb - dskfree_mb );
if (verbose >= 3)
printf ("dsktotal_mb=%.0f dskfree_mb=%.0f dskused_mb=%.0f\n", dsktotal_mb, dskfree_mb, dskused_mb);
if(allswaps && dsktotal_mb > 0){
percent = 100 * (((double) dskused_mb) / ((double) dsktotal_mb));
result = max_state (result, check_swap (dskfree_mb, dsktotal_mb));
if (verbose) {
xasprintf (&status, "%s [%.0f (%d%%)]", status, dskfree_mb, 100 - percent);
}
}
total_swap_mb += dsktotal_mb;
free_swap_mb += dskfree_mb;
used_swap_mb += dskused_mb;
}
/* 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: "));
die(STATE_UNKNOWN, _("Error in swapctl call\n"));
}
for(i=0;i<nswaps;i++){
dsktotal_mb = (float) ent[i].se_nblks / conv_factor;
dskused_mb = (float) ent[i].se_inuse / conv_factor;
dskfree_mb = ( dsktotal_mb - dskused_mb );
if(allswaps && dsktotal_mb > 0){
percent = 100 * (((double) dskused_mb) / ((double) dsktotal_mb));
result = max_state (result, check_swap(dskfree_mb, dsktotal_mb));
if (verbose) {
xasprintf (&status, "%s [%.0f (%d%%)]", status, dskfree_mb, 100 - percent);
}
}
total_swap_mb += dsktotal_mb;
free_swap_mb += dskfree_mb;
used_swap_mb += dskused_mb;
}
/* and clean up after ourselves */
free(ent);
# endif /* CHECK_SWAP_SWAPCTL_BSD */
# endif /* CHECK_SWAP_SWAPCTL_SVR4 */
# endif /* HAVE_SWAP */
#endif /* HAVE_PROC_MEMINFO */
/* if total_swap_mb == 0, let's not divide by 0 */
if(total_swap_mb) {
percent_used = 100 * ((double) used_swap_mb) / ((double) total_swap_mb);
} else {
percent_used = 100;
status = "- Swap is either disabled, not present, or of zero size. ";
}
result = max_state (result, check_swap(free_swap_mb, total_swap_mb));
printf (_("SWAP %s - %d%% free (%dMB out of %dMB) %s|"),
state_text (result),
(100 - percent_used), (int) free_swap_mb, (int) total_swap_mb, status);
uint64_t warn_print = warn.value;
if (warn.is_percentage) warn_print = warn.value * (total_swap_mb *1024 *1024/100);
uint64_t crit_print = crit.value;
if (crit.is_percentage) crit_print = crit.value * (total_swap_mb *1024 *1024/100);
puts (perfdata_uint64 ("swap", free_swap_mb *1024 *1024, "B",
true, warn_print,
true, crit_print,
true, 0,
true, (long) total_swap_mb * 1024 * 1024));
return result;
}
int
check_swap(float free_swap_mb, float total_swap_mb)
{
if (!total_swap_mb) return no_swap_state;
uint64_t free_swap = free_swap_mb * (1024 * 1024); /* Convert back to bytes as warn and crit specified in bytes */
uint64_t usage_percentage = ((total_swap_mb - free_swap_mb) / total_swap_mb) * 100;
if (warn.value || crit.value) { /* Thresholds defined */
if (!crit.is_percentage && crit.value >= free_swap) return STATE_CRITICAL;
if (!warn.is_percentage && warn.value >= free_swap) return STATE_WARNING;
if (crit.is_percentage &&
crit.value != 0 &&
usage_percentage >= (100 - crit.value))
{
return STATE_CRITICAL;
}
if (warn.is_percentage &&
warn.value != 0 &&
usage_percentage >= (100 - warn.value))
{
return STATE_WARNING;
}
return STATE_OK;
} else { /* Without thresholds */
return STATE_OK;
}
}
/* 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'},
{"no-swap", required_argument, 0, 'n'},
{"verbose", no_argument, 0, 'v'},
{"version", no_argument, 0, 'V'},
{"help", no_argument, 0, 'h'},
{0, 0, 0, 0}
};
while (1) {
c = getopt_long (argc, argv, "+?Vvhac:w:n:", longopts, &option);
if (c == -1 || c == EOF)
break;
switch (c) {
case 'w': /* warning size threshold */
{
/*
* We expect either a positive integer value without a unit, which means
* the unit is Bytes or a positive integer value and a percentage sign (%),
* which means the value must be with 0 and 100 and is relative to the total swap
*/
size_t length;
length = strlen(optarg);
if (optarg[length - 1] == '%') {
/* It's percentage */
warn.is_percentage = true;
optarg[length - 1] = '\0';
if (is_uint64(optarg, &warn.value)) {
if (warn.value > 100) {
usage4 (_("Warning threshold percentage must be <= 100!"));
}
}
break;
} else {
/* It's Bytes */
warn.is_percentage = false;
if (is_uint64(optarg, &warn.value)) {
break;
} else {
usage4 (_("Warning threshold be positive integer or percentage!"));
}
}
}
case 'c': /* critical size threshold */
{
/*
* We expect either a positive integer value without a unit, which means
* the unit is Bytes or a positive integer value and a percentage sign (%),
* which means the value must be with 0 and 100 and is relative to the total swap
*/
size_t length;
length = strlen(optarg);
if (optarg[length - 1] == '%') {
/* It's percentage */
crit.is_percentage = true;
optarg[length - 1] = '\0';
if (is_uint64(optarg, &crit.value)) {
if (crit.value> 100) {
usage4 (_("Critical threshold percentage must be <= 100!"));
}
}
break;
} else {
/* It's Bytes */
crit.is_percentage = false;
if (is_uint64(optarg, &crit.value)) {
break;
} else {
usage4 (_("Critical threshold be positive integer or percentage!"));
}
}
}
case 'a': /* all swap */
allswaps = true;
break;
case 'n':
if ((no_swap_state = mp_translate_state(optarg)) == ERROR) {
usage4 (_("no-swap result must be a valid state name (OK, WARNING, CRITICAL, UNKNOWN) or integer (0-3)."));
}
break;
case 'v': /* verbose */
verbose++;
break;
case 'V': /* version */
print_revision (progname, NP_VERSION);
exit (STATE_UNKNOWN);
case 'h': /* help */
print_help ();
exit (STATE_UNKNOWN);
case '?': /* error */
usage5 ();
}
}
c = optind;
if (c == argc)
return validate_arguments ();
return validate_arguments ();
}
int
validate_arguments (void)
{
if ((warn.is_percentage == crit.is_percentage) && (warn.value < crit.value)) {
/* This is NOT triggered if warn and crit are different units, e.g warn is percentage
* and crit is absolute. We cannot determine the condition at this point since we
* dont know the value of total swap yet
*/
usage4(_("Warning should be more than critical"));
}
return OK;
}
void
print_help (void)
{
print_revision (progname, NP_VERSION);
printf (_(COPYRIGHT), copyright, email);
printf ("%s\n", _("Check swap space on local machine."));
printf ("\n\n");
print_usage ();
printf (UT_HELP_VRSN);
printf (UT_EXTRA_OPTS);
printf (" %s\n", "-w, --warning=INTEGER");
printf (" %s\n", _("Exit with WARNING status if less than INTEGER bytes of swap space are free"));
printf (" %s\n", "-w, --warning=PERCENT%");
printf (" %s\n", _("Exit with WARNING status if less than PERCENT of swap space is free"));
printf (" %s\n", "-c, --critical=INTEGER");
printf (" %s\n", _("Exit with CRITICAL status if less than INTEGER bytes of swap space are free"));
printf (" %s\n", "-c, --critical=PERCENT%");
printf (" %s\n", _("Exit with CRITICAL status if less than PERCENT of swap space is free"));
printf (" %s\n", "-a, --allswaps");
printf (" %s\n", _("Conduct comparisons for all swap partitions, one by one"));
printf (" %s\n", "-n, --no-swap=<ok|warning|critical|unknown>");
printf (" %s %s\n", _("Resulting state when there is no swap regardless of thresholds. Default:"), state_text(no_swap_state));
printf (UT_VERBOSE);
printf ("\n");
printf ("%s\n", _("Notes:"));
printf (" %s\n", _("Both INTEGER and PERCENT thresholds can be specified, they are all checked."));
printf (" %s\n", _("Without thresholds, the plugin shows free swap space and performance data, but always returns OK."));
printf (" %s\n", _("On AIX, if -a is specified, uses lsps -a, otherwise uses lsps -s."));
printf (UT_SUPPORT);
}
void
print_usage (void)
{
printf ("%s\n", _("Usage:"));
printf (" %s [-av] [-w <percent_free>%%] [-c <percent_free>%%]\n",progname);
printf (" [-w <bytes_free>] [-c <bytes_free>] [-n <state>]\n");
}
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