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Diffstat (limited to 'plugins/check_swap.c')
-rw-r--r--plugins/check_swap.c280
1 files changed, 159 insertions, 121 deletions
diff --git a/plugins/check_swap.c b/plugins/check_swap.c
index 4d5a4071..7da26cfc 100644
--- a/plugins/check_swap.c
+++ b/plugins/check_swap.c
@@ -34,6 +34,9 @@ const char *email = "devel@monitoring-plugins.org";
#include "common.h"
#include "popen.h"
#include "utils.h"
+#include <string.h>
+#include <math.h>
+#include <libintl.h>
#ifdef HAVE_DECL_SWAPCTL
# ifdef HAVE_SYS_PARAM_H
@@ -51,16 +54,19 @@ const char *email = "devel@monitoring-plugins.org";
# define SWAP_CONVERSION 1
#endif
-int check_swap (int usp, float free_swap_mb);
+typedef struct {
+ int is_percentage;
+ uint64_t value;
+} threshold_t;
+
+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);
-int warn_percent = 0;
-int crit_percent = 0;
-float warn_size_bytes = 0;
-float crit_size_bytes = 0;
+threshold_t warn;
+threshold_t crit;
int verbose;
int allswaps;
int no_swap_state = STATE_CRITICAL;
@@ -68,9 +74,10 @@ int no_swap_state = STATE_CRITICAL;
int
main (int argc, char **argv)
{
- int percent_used, percent;
- float total_swap_mb = 0, used_swap_mb = 0, free_swap_mb = 0;
- float dsktotal_mb = 0, dskused_mb = 0, dskfree_mb = 0, tmp_mb = 0;
+ 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
@@ -116,10 +123,15 @@ main (int argc, char **argv)
}
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_mb, &dskused_mb, &dskfree_mb) == 3) {
- dsktotal_mb = dsktotal_mb / 1048576; /* Apply conversion */
- dskused_mb = dskused_mb / 1048576;
- dskfree_mb = dskfree_mb / 1048576;
+ /*
+ * 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;
@@ -128,21 +140,25 @@ main (int argc, char **argv)
percent=100.0;
else
percent = 100 * (((double) dskused_mb) / ((double) dsktotal_mb));
- result = max_state (result, check_swap (percent, dskfree_mb));
+ result = max_state (result, check_swap (dskfree_mb, dsktotal_mb));
if (verbose)
- xasprintf (&status, "%s [%.0f (%d%%)]", status, dskfree_mb, 100 - percent);
+ xasprintf (&status, "%s [%lu (%d%%)]", status, dskfree_mb, 100 - percent);
}
}
- else if (sscanf (input_buffer, "%*[S]%*[w]%*[a]%*[p]%[TotalFre]%*[:] %f %*[k]%*[B]", str, &tmp_mb)) {
+ /*
+ * 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]%[TotalFre]%*[:] %lu %*[k]%*[B]", str, &tmp_KB)) {
if (verbose >= 3) {
- printf("Got %s with %f\n", str, tmp_mb);
+ 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_mb / 1024;
+ dsktotal_mb = tmp_KB / 1024;
}
else if (strcmp ("Free", str) == 0) {
- dskfree_mb = tmp_mb / 1024;
+ dskfree_mb = tmp_KB / 1024;
}
}
}
@@ -227,7 +243,7 @@ main (int argc, char **argv)
free_swap_mb += dskfree_mb;
if (allswaps) {
percent = 100 * (((double) dskused_mb) / ((double) dsktotal_mb));
- result = max_state (result, check_swap (percent, dskfree_mb));
+ result = max_state (result, check_swap (dskfree_mb, dsktotal_mb));
if (verbose)
xasprintf (&status, "%s [%.0f (%d%%)]", status, dskfree_mb, 100 - percent);
}
@@ -289,7 +305,7 @@ main (int argc, char **argv)
if(allswaps && dsktotal_mb > 0){
percent = 100 * (((double) dskused_mb) / ((double) dsktotal_mb));
- result = max_state (result, check_swap (percent, dskfree_mb));
+ result = max_state (result, check_swap (dskfree_mb, dsktotal_mb));
if (verbose) {
xasprintf (&status, "%s [%.0f (%d%%)]", status, dskfree_mb, 100 - percent);
}
@@ -328,7 +344,7 @@ main (int argc, char **argv)
if(allswaps && dsktotal_mb > 0){
percent = 100 * (((double) dskused_mb) / ((double) dsktotal_mb));
- result = max_state (result, check_swap (percent, dskfree_mb));
+ result = max_state (result, check_swap(dskfree_mb, dsktotal_mb));
if (verbose) {
xasprintf (&status, "%s [%.0f (%d%%)]", status, dskfree_mb, 100 - percent);
}
@@ -355,14 +371,19 @@ main (int argc, char **argv)
status = "- Swap is either disabled, not present, or of zero size. ";
}
- result = max_state (result, check_swap (percent_used, free_swap_mb));
- printf (_("SWAP %s - %d%% free (%d MB out of %d MB) %s|"),
+ 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);
- puts (perfdata ("swap", (long) free_swap_mb, "MB",
- TRUE, (long) max (warn_size_bytes/(1024 * 1024), warn_percent/100.0*total_swap_mb),
- TRUE, (long) max (crit_size_bytes/(1024 * 1024), crit_percent/100.0*total_swap_mb),
+ 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));
@@ -370,26 +391,37 @@ main (int argc, char **argv)
}
-
int
-check_swap (int usp, float free_swap_mb)
+check_swap(float free_swap_mb, float total_swap_mb)
{
- if (!free_swap_mb) return no_swap_state;
+ if (!total_swap_mb) return no_swap_state;
- int result = STATE_UNKNOWN;
- float free_swap = free_swap_mb * (1024 * 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_bytes > 0 && free_swap <= crit_size_bytes)
- result = STATE_CRITICAL;
- else if (usp >= 0 && warn_percent != 0 && usp >= (100.0 - warn_percent))
- result = STATE_WARNING;
- else if (warn_size_bytes > 0 && free_swap <= warn_size_bytes)
- result = STATE_WARNING;
- else if (usp >= 0.0)
- result = STATE_OK;
- return result;
+ uint64_t free_swap = free_swap_mb * (1024 * 1024); /* Convert back to bytes as warn and crit specified in bytes */
+
+ if (!crit.is_percentage && crit.value >= free_swap) return STATE_CRITICAL;
+ if (!warn.is_percentage && warn.value >= free_swap) return STATE_WARNING;
+
+
+ uint64_t usage_percentage = ((total_swap_mb - free_swap_mb) / total_swap_mb) * 100;
+
+ if (crit.is_percentage &&
+ usage_percentage >= 0 &&
+ crit.value != 0 &&
+ usage_percentage >= (100 - crit.value))
+ {
+ return STATE_CRITICAL;
+ }
+
+ if (warn.is_percentage &&
+ usage_percentage >= 0 &&
+ warn.value != 0 &&
+ usage_percentage >= (100 - warn.value))
+ {
+ return STATE_WARNING;
+ }
+
+ return STATE_OK;
}
@@ -422,42 +454,68 @@ process_arguments (int argc, char **argv)
break;
switch (c) {
- case 'w': /* warning size threshold */
- if (is_intnonneg (optarg)) {
- warn_size_bytes = (float) atoi (optarg);
- break;
- }
- else if (strstr (optarg, ",") &&
- strstr (optarg, "%") &&
- sscanf (optarg, "%f,%d%%", &warn_size_bytes, &warn_percent) == 2) {
- warn_size_bytes = floorf(warn_size_bytes);
- 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_bytes = (float) atoi (optarg);
- break;
- }
- else if (strstr (optarg, ",") &&
- strstr (optarg, "%") &&
- sscanf (optarg, "%f,%d%%", &crit_size_bytes, &crit_percent) == 2) {
- crit_size_bytes = floorf(crit_size_bytes);
- break;
- }
- else if (strstr (optarg, "%") &&
- sscanf (optarg, "%d%%", &crit_percent) == 1) {
- break;
- }
- else {
- usage4 (_("Critical threshold must be integer or percentage!"));
+ 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 = 1;
+ optarg[length - 1] = '\0';
+ if (is_uint64(optarg, &warn.value)) {
+ if (warn.value > 100) {
+ usage4 (_("Warning threshold percentage must be <= 100!"));
+ } else {
+ break;
+ }
+ }
+ } else {
+ /* It's Bytes */
+ warn.is_percentage = 0;
+ 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 = 1;
+ optarg[length - 1] = '\0';
+ if (is_uint64(optarg, &crit.value)) {
+ if (crit.value> 100) {
+ usage4 (_("Critical threshold percentage must be <= 100!"));
+ } else {
+ break;
+ }
+ }
+ } else {
+ /* It's Bytes */
+ crit.is_percentage = 0;
+ if (is_uint64(optarg, &crit.value)) {
+ break;
+ } else {
+ usage4 (_("Critical threshold be positive integer or percentage!"));
+ }
+ }
+ }
case 'a': /* all swap */
allswaps = TRUE;
break;
@@ -482,23 +540,6 @@ process_arguments (int argc, char **argv)
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_bytes == 0 && is_intnonneg (argv[c]))
- warn_size_bytes = (float) atoi (argv[c++]);
-
- if (c == argc)
- return validate_arguments ();
- if (crit_size_bytes == 0 && is_intnonneg (argv[c]))
- crit_size_bytes = (float) atoi (argv[c++]);
return validate_arguments ();
}
@@ -508,17 +549,15 @@ process_arguments (int argc, char **argv)
int
validate_arguments (void)
{
- if (warn_percent == 0 && crit_percent == 0 && warn_size_bytes == 0
- && crit_size_bytes == 0) {
+ if (warn.value == 0 && crit.value == 0) {
return ERROR;
}
- else if (warn_percent < crit_percent) {
- usage4
- (_("Warning percentage should be more than critical percentage"));
- }
- else if (warn_size_bytes < crit_size_bytes) {
- usage4
- (_("Warning free space should be more than critical free space"));
+ else 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 absolut. 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;
}
@@ -534,7 +573,7 @@ print_help (void)
printf ("%s\n", _("Check swap space on local machine."));
- printf ("\n\n");
+ printf ("\n\n");
print_usage ();
@@ -542,33 +581,32 @@ print_help (void)
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 (" %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", _("On AIX, if -a is specified, uses lsps -a, otherwise uses lsps -s."));
+ printf ("%s\n", _("Notes:"));
+ printf (" %s\n", _("Both INTEGER and PERCENT thresholds can be specified, they are all checked."));
+ 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");
+ 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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