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/*****************************************************************************
*
* Nagios check_users plugin
*
* License: GPL
* Copyright (c) 2000-2007 Nagios Plugins Development Team
*
* Description:
*
* This file contains the check_users plugin
*
* This plugin checks the number of users currently logged in on the local
* system and generates an error if the number exceeds the thresholds
* specified.
*
*
* 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_users";
const char *copyright = "2000-2007";
const char *email = "nagiosplug-devel@lists.sourceforge.net";
#include "common.h"
#include "utils.h"
#include <utmpx.h>
#define possibly_set(a,b) ((a) == 0 ? (b) : 0)
int process_arguments (int, char **);
void print_help (void);
void print_usage (void);
int wusers = -1;
int cusers = -1;
int
main (int argc, char **argv)
{
int users = -1;
int result = STATE_UNKNOWN;
char input_buffer[MAX_INPUT_BUFFER];
char *perf;
struct utmpx *putmpx;
setlocale (LC_ALL, "");
bindtextdomain (PACKAGE, LOCALEDIR);
textdomain (PACKAGE);
perf = strdup("");
/* Parse extra opts if any */
argv=np_extra_opts (&argc, argv, progname);
if (process_arguments (argc, argv) == ERROR)
usage4 (_("Could not parse arguments"));
users = 0;
/* get currently logged users from utmpx */
setutxent();
while( (putmpx=getutxent()) ) {
if( (putmpx->ut_type==USER_PROCESS) ) {
users++;
}
}
endutxent();
/* check the user count against warning and critical thresholds */
if (users > cusers)
result = STATE_CRITICAL;
else if (users > wusers)
result = STATE_WARNING;
else if (users >= 0)
result = STATE_OK;
if (result == STATE_UNKNOWN)
printf ("%s\n", _("Unable to read output"));
else {
asprintf(&perf, "%s", perfdata ("users", users, "",
TRUE, wusers,
TRUE, cusers,
TRUE, 0,
FALSE, 0));
printf (_("USERS %s - %d users currently logged in |%s\n"), state_text (result),
users, perf);
}
return result;
}
/* process command-line arguments */
int
process_arguments (int argc, char **argv)
{
int c;
int option = 0;
static struct option longopts[] = {
{"critical", required_argument, 0, 'c'},
{"warning", required_argument, 0, 'w'},
{"version", no_argument, 0, 'V'},
{"help", no_argument, 0, 'h'},
{0, 0, 0, 0}
};
if (argc < 2)
usage ("\n");
while (1) {
c = getopt_long (argc, argv, "+hVvc:w:", longopts, &option);
if (c == -1 || c == EOF || c == 1)
break;
switch (c) {
case '?': /* print short usage statement if args not parsable */
usage5 ();
case 'h': /* help */
print_help ();
exit (STATE_OK);
case 'V': /* version */
print_revision (progname, NP_VERSION);
exit (STATE_OK);
case 'c': /* critical */
if (!is_intnonneg (optarg))
usage4 (_("Critical threshold must be a positive integer"));
else
cusers = atoi (optarg);
break;
case 'w': /* warning */
if (!is_intnonneg (optarg))
usage4 (_("Warning threshold must be a positive integer"));
else
wusers = atoi (optarg);
break;
}
}
c = optind;
if (wusers == -1 && argc > c) {
if (is_intnonneg (argv[c]) == FALSE)
usage4 (_("Warning threshold must be a positive integer"));
else
wusers = atoi (argv[c++]);
}
if (cusers == -1 && argc > c) {
if (is_intnonneg (argv[c]) == FALSE)
usage4 (_("Warning threshold must be a positive integer"));
else
cusers = atoi (argv[c]);
}
return OK;
}
void
print_help (void)
{
print_revision (progname, NP_VERSION);
printf ("Copyright (c) 1999 Ethan Galstad\n");
printf (COPYRIGHT, copyright, email);
printf ("%s\n", _("This plugin checks the number of users currently logged in on the local"));
printf ("%s\n", _("system and generates an error if the number exceeds the thresholds specified."));
printf ("\n\n");
print_usage ();
printf (UT_HELP_VRSN);
printf (UT_EXTRA_OPTS);
printf (" %s\n", "-w, --warning=INTEGER");
printf (" %s\n", _("Set WARNING status if more than INTEGER users are logged in"));
printf (" %s\n", "-c, --critical=INTEGER");
printf (" %s\n", _("Set CRITICAL status if more than INTEGER users are logged in"));
printf (UT_SUPPORT);
}
void
print_usage (void)
{
printf ("%s\n", _("Usage:"));
printf ("%s -w <users> -c <users>\n", progname);
}
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