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/*****************************************************************************
*
* 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.
*
*****************************************************************************/
#include "common.h"
#include "popen.h"
#include "utils.h"
const char *progname = "check_users";
const char *revision = "$Revision$";
const char *copyright = "2002-2003";
const char *authors = "Nagios Plugin Development Team";
const char *email = "nagiosplug-devel@lists.sourceforge.net";
const char *summary = "\
This plugin checks the number of users currently logged in on the local\n\
system and generates an error if the number exceeds the thresholds specified.\n";
const char *option_summary = "-w <users> -c <users>";
const char *options = "\
-w, --warning=INTEGER\n\
Set WARNING status if more than INTEGER users are logged in\n\
-c, --critical=INTEGER\n\
Set CRITICAL status if more than INTEGER users are logged in\n";
const char *standard_options = "\
-h, --help\n\
Print detailed help screen\n\
-V, --version\n\
Print version information\n\n";
#define possibly_set(a,b) ((a) == 0 ? (b) : 0)
int process_arguments (int, char **);
void print_usage (void);
void print_help (void);
int wusers = -1;
int cusers = -1;
int
main (int argc, char **argv)
{
int users = -1;
int result = STATE_OK;
char input_buffer[MAX_INPUT_BUFFER];
if (process_arguments (argc, argv) == ERROR)
usage ("Could not parse arguments\n");
/* run the command */
child_process = spopen (WHO_COMMAND);
if (child_process == NULL) {
printf ("Could not open pipe: %s\n", WHO_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", WHO_COMMAND);
users = 0;
while (fgets (input_buffer, MAX_INPUT_BUFFER - 1, child_process)) {
/* increment 'users' on all lines except total user count */
if (input_buffer[0] != '#') {
users++;
continue;
}
/* get total logged in users */
if (sscanf (input_buffer, "# users=%d", &users) == 1)
break;
}
/* check STDERR */
if (fgets (input_buffer, MAX_INPUT_BUFFER - 1, child_stderr))
result = possibly_set (result, STATE_UNKNOWN);
(void) fclose (child_stderr);
/* close the pipe */
if (spclose (child_process))
result = possibly_set (result, STATE_UNKNOWN);
/* else 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 ("Unable to read output\n");
else
printf ("USERS %s - %d users currently logged in\n", state_text (result),
users);
return result;
}
/* process command-line arguments */
int
process_arguments (int argc, char **argv)
{
int c;
int option_index = 0;
static struct option long_options[] = {
{"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:", long_options, &option_index);
if (c == -1 || c == EOF || c == 1)
break;
switch (c) {
case '?': /* print short usage statement if args not parsable */
printf ("%s: Unknown argument: %s\n\n", progname, optarg);
print_usage ();
exit (STATE_UNKNOWN);
case 'h': /* help */
print_help ();
exit (STATE_OK);
case 'V': /* version */
print_revision (progname, revision);
exit (STATE_OK);
case 'c': /* critical */
if (!is_intnonneg (optarg))
usage ("Critical threshold must be a nonnegative integer\n");
cusers = atoi (optarg);
break;
case 'w': /* warning */
if (!is_intnonneg (optarg))
usage ("Warning threshold must be a nonnegative integer\n");
wusers = atoi (optarg);
break;
}
}
c = optind;
if (wusers == -1 && argc > c) {
if (is_intnonneg (argv[c]) == FALSE)
usage ("Warning threshold must be a nonnegative integer\n");
wusers = atoi (argv[c++]);
}
if (cusers == -1 && argc > c) {
if (is_intnonneg (argv[c]) == FALSE)
usage ("Warning threshold must be a nonnegative integer\n");
cusers = atoi (argv[c]);
}
return OK;
}
void
print_help (void)
{
print_revision (progname, revision);
printf ("Copyright (c) %s %s\n\t<%s>\n\n", copyright, authors, email);
printf (summary);
print_usage ();
printf ("\nOptions:\n");
printf (options);
printf (standard_options);
support ();
}
void
print_usage (void)
{
printf ("Usage: %s %s\n", progname, option_summary);
printf (" %s (-h|--help)\n", progname);
printf (" %s (-V|--version)\n", progname);
}
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