pkg-monitoring-plugins/lib/utils_base.c

313 lines
7.4 KiB
C

/*****************************************************************************
*
* utils_base.c
*
* License: GPL
* Copyright (c) 2006 Nagios Plugins Development Team
*
* Library of useful functions for plugins
*
*
* 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/>.
*
*
*****************************************************************************/
#include "common.h"
#include <stdarg.h>
#include "utils_base.h"
void
die (int result, const char *fmt, ...)
{
va_list ap;
va_start (ap, fmt);
vprintf (fmt, ap);
va_end (ap);
exit (result);
}
void set_range_start (range *this, double value) {
this->start = value;
this->start_infinity = FALSE;
}
void set_range_end (range *this, double value) {
this->end = value;
this->end_infinity = FALSE;
}
range
*parse_range_string (char *str) {
range *temp_range;
double start;
double end;
char *end_str;
temp_range = (range *) malloc(sizeof(range));
/* Set defaults */
temp_range->start = 0;
temp_range->start_infinity = FALSE;
temp_range->end = 0;
temp_range->end_infinity = TRUE;
temp_range->alert_on = OUTSIDE;
if (str[0] == '@') {
temp_range->alert_on = INSIDE;
str++;
}
end_str = index(str, ':');
if (end_str != NULL) {
if (str[0] == '~') {
temp_range->start_infinity = TRUE;
} else {
start = strtod(str, NULL); /* Will stop at the ':' */
set_range_start(temp_range, start);
}
end_str++; /* Move past the ':' */
} else {
end_str = str;
}
end = strtod(end_str, NULL);
if (strcmp(end_str, "") != 0) {
set_range_end(temp_range, end);
}
if (temp_range->start_infinity == TRUE ||
temp_range->end_infinity == TRUE ||
temp_range->start <= temp_range->end) {
return temp_range;
}
free(temp_range);
return NULL;
}
/* returns 0 if okay, otherwise 1 */
int
_set_thresholds(thresholds **my_thresholds, char *warn_string, char *critical_string)
{
thresholds *temp_thresholds = NULL;
if ((temp_thresholds = malloc(sizeof(thresholds))) == NULL)
die(STATE_UNKNOWN, _("Cannot allocate memory: %s\n"),
strerror(errno));
temp_thresholds->warning = NULL;
temp_thresholds->critical = NULL;
if (warn_string != NULL) {
if ((temp_thresholds->warning = parse_range_string(warn_string)) == NULL) {
return NP_RANGE_UNPARSEABLE;
}
}
if (critical_string != NULL) {
if ((temp_thresholds->critical = parse_range_string(critical_string)) == NULL) {
return NP_RANGE_UNPARSEABLE;
}
}
*my_thresholds = temp_thresholds;
return 0;
}
void
set_thresholds(thresholds **my_thresholds, char *warn_string, char *critical_string)
{
switch (_set_thresholds(my_thresholds, warn_string, critical_string)) {
case 0:
return;
case NP_RANGE_UNPARSEABLE:
die(STATE_UNKNOWN, _("Range format incorrect"));
case NP_WARN_WITHIN_CRIT:
die(STATE_UNKNOWN, _("Warning level is a subset of critical and will not be alerted"));
break;
}
}
void print_thresholds(const char *threshold_name, thresholds *my_threshold) {
printf("%s - ", threshold_name);
if (! my_threshold) {
printf("Threshold not set");
} else {
if (my_threshold->warning) {
printf("Warning: start=%g end=%g; ", my_threshold->warning->start, my_threshold->warning->end);
} else {
printf("Warning not set; ");
}
if (my_threshold->critical) {
printf("Critical: start=%g end=%g", my_threshold->critical->start, my_threshold->critical->end);
} else {
printf("Critical not set");
}
}
printf("\n");
}
/* Returns TRUE if alert should be raised based on the range */
int
check_range(double value, range *my_range)
{
int no = FALSE;
int yes = TRUE;
if (my_range->alert_on == INSIDE) {
no = TRUE;
yes = FALSE;
}
if (my_range->end_infinity == FALSE && my_range->start_infinity == FALSE) {
if ((my_range->start <= value) && (value <= my_range->end)) {
return no;
} else {
return yes;
}
} else if (my_range->start_infinity == FALSE && my_range->end_infinity == TRUE) {
if (my_range->start <= value) {
return no;
} else {
return yes;
}
} else if (my_range->start_infinity == TRUE && my_range->end_infinity == FALSE) {
if (value <= my_range->end) {
return no;
} else {
return yes;
}
} else {
return no;
}
}
/* Returns status */
int
get_status(double value, thresholds *my_thresholds)
{
if (my_thresholds->critical != NULL) {
if (check_range(value, my_thresholds->critical) == TRUE) {
return STATE_CRITICAL;
}
}
if (my_thresholds->warning != NULL) {
if (check_range(value, my_thresholds->warning) == TRUE) {
return STATE_WARNING;
}
}
return STATE_OK;
}
char *np_escaped_string (const char *string) {
char *data;
int i, j=0;
data = strdup(string);
for (i=0; data[i]; i++) {
if (data[i] == '\\') {
switch(data[++i]) {
case 'n':
data[j++] = '\n';
break;
case 'r':
data[j++] = '\r';
break;
case 't':
data[j++] = '\t';
break;
case '\\':
data[j++] = '\\';
break;
default:
data[j++] = data[i];
}
} else {
data[j++] = data[i];
}
}
data[j] = '\0';
return data;
}
int np_check_if_root(void) { return (geteuid() == 0); }
int np_warn_if_not_root(void) {
int status = np_check_if_root();
if(!status) {
printf(_("Warning: "));
printf(_("This plugin must be either run as root or setuid root.\n"));
printf(_("To run as root, you can use a tool like sudo.\n"));
printf(_("To set the setuid permissions, use the command:\n"));
/* XXX could we use something like progname? */
printf("\tchmod u+s yourpluginfile\n");
}
return status;
}
/*
* Extract the value from key/value pairs, or return NULL. The value returned
* can be free()ed.
* This function can be used to parse NTP control packet data and performance
* data strings.
*/
char *np_extract_value(const char *varlist, const char *name, char sep) {
char *tmp=NULL, *value=NULL;
int i;
while (1) {
/* Strip any leading space */
for (varlist; isspace(varlist[0]); varlist++);
if (strncmp(name, varlist, strlen(name)) == 0) {
varlist += strlen(name);
/* strip trailing spaces */
for (varlist; isspace(varlist[0]); varlist++);
if (varlist[0] == '=') {
/* We matched the key, go past the = sign */
varlist++;
/* strip leading spaces */
for (varlist; isspace(varlist[0]); varlist++);
if (tmp = index(varlist, sep)) {
/* Value is delimited by a comma */
if (tmp-varlist == 0) continue;
value = (char *)malloc(tmp-varlist+1);
strncpy(value, varlist, tmp-varlist);
value[tmp-varlist] = '\0';
} else {
/* Value is delimited by a \0 */
if (strlen(varlist) == 0) continue;
value = (char *)malloc(strlen(varlist) + 1);
strncpy(value, varlist, strlen(varlist));
value[strlen(varlist)] = '\0';
}
break;
}
}
if (tmp = index(varlist, sep)) {
/* More keys, keep going... */
varlist = tmp + 1;
} else {
/* We're done */
break;
}
}
/* Clean-up trailing spaces/newlines */
if (value) for (i=strlen(value)-1; isspace(value[i]); i--) value[i] = '\0';
return value;
}