path: root/plugins/check_overcr.c

/******************************************************************************
*
* CHECK_OVERCR.C
*
* Program: Over-CR collector plugin for Nagios
* License: GPL
* Copyright (c) 1999 Ethan Galstad (nagios@nagios.org)
*
* $Id$
*
* Description:
*
* Notes:
* - This plugin requires that Eric Molitors' Over-CR collector daemon
*        be running on any UNIX boxes you want to monitor.  Over-CR
*        is available from * http://www.molitor.org/overcr/
*
* Modifications:
*
* 08-11-999 Jacob Lundqvist <jaclu@grm.se>
* Load was presented as a one digit percentage - changed to two digit
*	value * before load of 11.2 was presented as "1.2%" (not very
*	high). Warning and Critical params were int's, not very good
*	for load, changed to doubles, so we can trap loadlimits like
*	1.5.  Also added more informative LOAD error messages.
* 
* License Information:
*
* 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 "config.h"
#include "common.h"
#include "netutils.h"
#include "utils.h"

#define CHECK_NONE	0
#define CHECK_LOAD1  	1
#define CHECK_LOAD5	2
#define CHECK_LOAD15	4
#define CHECK_DPU	8
#define CHECK_PROCS	16
#define CHECK_NETSTAT	32
#define CHECK_UPTIME	64

#define PORT	2000

#define PROGNAME "check_overcr"

char *server_address = NULL;
int server_port = PORT;
double warning_value = 0L;
double critical_value = 0L;
int check_warning_value = FALSE;
int check_critical_value = FALSE;
int vars_to_check = CHECK_NONE;
int cmd_timeout = 1;

int netstat_port = 0;
char *disk_name = NULL;
char *process_name = NULL;

int process_arguments (int, char **);
void print_usage (void);
void print_help (void);

int
main (int argc, char **argv)
{
	int result;
	char send_buffer[MAX_INPUT_BUFFER];
	char recv_buffer[MAX_INPUT_BUFFER];
	char output_message[MAX_INPUT_BUFFER];
	char temp_buffer[MAX_INPUT_BUFFER];
	char *temp_ptr = NULL;
	int found_disk = FALSE;
	unsigned long percent_used_disk_space = 100;
	double load;
	double load_1min;
	double load_5min;
	double load_15min;
	int port_connections = 0;
	int processes = 0;
	double uptime_raw_hours;
	int uptime_raw_minutes = 0;
	int uptime_days = 0;
	int uptime_hours = 0;
	int uptime_minutes = 0;

	if (process_arguments (argc, argv) == ERROR)
		usage ("Could not parse arguments\n");

	/* initialize alarm signal handling */
	signal (SIGALRM, socket_timeout_alarm_handler);

	/* set socket timeout */
	alarm (socket_timeout);

	result = STATE_OK;

	if (vars_to_check == CHECK_LOAD1 || vars_to_check == CHECK_LOAD5
			|| vars_to_check == CHECK_LOAD15) {

		strcpy (send_buffer, "LOAD\r\nQUIT\r\n");
		result =
			process_tcp_request2 (server_address, server_port, send_buffer,
														recv_buffer, sizeof (recv_buffer));
		if (result != STATE_OK)
			return result;

		temp_ptr = (char *) strtok (recv_buffer, "\r\n");
		if (temp_ptr == NULL) {
			printf ("Invalid response from server - no load information\n");
			return STATE_CRITICAL;
		}
		load_1min = strtod (temp_ptr, NULL);
		temp_ptr = (char *) strtok (NULL, "\r\n");
		if (temp_ptr == NULL) {
			printf ("Invalid response from server after load 1\n");
			return STATE_CRITICAL;
		}
		load_5min = strtod (temp_ptr, NULL);
		temp_ptr = (char *) strtok (NULL, "\r\n");
		if (temp_ptr == NULL) {
			printf ("Invalid response from server after load 5\n");
			return STATE_CRITICAL;
		}
		load_15min = strtod (temp_ptr, NULL);


		switch (vars_to_check) {
		case CHECK_LOAD1:
			strcpy (temp_buffer, "1");
			load = load_1min;
			break;
		case CHECK_LOAD5:
			strcpy (temp_buffer, "5");
			load = load_5min;
			break;
		default:
			strcpy (temp_buffer, "15");
			load = load_15min;
			break;
		}

		if (check_critical_value == TRUE && (load >= critical_value))
			result = STATE_CRITICAL;
		else if (check_warning_value == TRUE && (load >= warning_value))
			result = STATE_WARNING;
		sprintf (output_message, "Load %s - %s-min load average = %0.2f",
						 (result == STATE_OK) ? "ok" : "problem", temp_buffer, load);
	}


	else if (vars_to_check == CHECK_DPU) {

		sprintf (send_buffer, "DISKSPACE\r\n");
		result =
			process_tcp_request2 (server_address, server_port, send_buffer,
														recv_buffer, sizeof (recv_buffer));
		if (result != STATE_OK)
			return result;

		for (temp_ptr = (char *) strtok (recv_buffer, " "); temp_ptr != NULL;
				 temp_ptr = (char *) strtok (NULL, " ")) {

			if (!strcmp (temp_ptr, disk_name)) {
				found_disk = TRUE;
				temp_ptr = (char *) strtok (NULL, "%");
				if (temp_ptr == NULL) {
					printf ("Invalid response from server\n");
					return STATE_CRITICAL;
				}
				percent_used_disk_space = strtoul (temp_ptr, NULL, 10);
				break;
			}

			temp_ptr = (char *) strtok (NULL, "\r\n");
		}

		/* error if we couldn't find the info for the disk */
		if (found_disk == FALSE) {
			sprintf (output_message, "Error: Disk '%s' non-existent or not mounted",
							 disk_name);
			result = STATE_CRITICAL;
		}

		/* else check the disk space used */
		else {

			if (check_critical_value == TRUE
					&& (percent_used_disk_space >= critical_value)) result =
					STATE_CRITICAL;
			else if (check_warning_value == TRUE
							 && (percent_used_disk_space >= warning_value)) result =
					STATE_WARNING;

			sprintf (output_message, "Disk %s - %lu%% used on %s",
							 (result == STATE_OK) ? "ok" : "problem",
							 percent_used_disk_space, disk_name);
		}
	}

	else if (vars_to_check == CHECK_NETSTAT) {

		sprintf (send_buffer, "NETSTAT %d\r\n", netstat_port);
		result =
			process_tcp_request2 (server_address, server_port, send_buffer,
														recv_buffer, sizeof (recv_buffer));
		if (result != STATE_OK)
			return result;

		port_connections = strtod (recv_buffer, NULL);

		if (check_critical_value == TRUE && (port_connections >= critical_value))
			result = STATE_CRITICAL;
		else if (check_warning_value == TRUE
						 && (port_connections >= warning_value)) result = STATE_WARNING;

		sprintf (output_message, "Net %s - %d connection%s on port %d",
						 (result == STATE_OK) ? "ok" : "problem", port_connections,
						 (port_connections == 1) ? "" : "s", netstat_port);
	}

	else if (vars_to_check == CHECK_PROCS) {

		sprintf (send_buffer, "PROCESS %s\r\n", process_name);
		result =
			process_tcp_request2 (server_address, server_port, send_buffer,
														recv_buffer, sizeof (recv_buffer));
		if (result != STATE_OK)
			return result;

		temp_ptr = (char *) strtok (recv_buffer, "(");
		if (temp_ptr == NULL) {
			printf ("Invalid response from server\n");
			return STATE_CRITICAL;
		}
		temp_ptr = (char *) strtok (NULL, ")");
		if (temp_ptr == NULL) {
			printf ("Invalid response from server\n");
			return STATE_CRITICAL;
		}
		processes = strtod (temp_ptr, NULL);

		if (check_critical_value == TRUE && (processes >= critical_value))
			result = STATE_CRITICAL;
		else if (check_warning_value == TRUE && (processes >= warning_value))
			result = STATE_WARNING;

		sprintf (output_message, "Process %s - %d instance%s of %s running",
						 (result == STATE_OK) ? "ok" : "problem", processes,
						 (processes == 1) ? "" : "s", process_name);
	}

	else if (vars_to_check == CHECK_UPTIME) {

		sprintf (send_buffer, "UPTIME\r\n");
		result =
			process_tcp_request2 (server_address, server_port, send_buffer,
														recv_buffer, sizeof (recv_buffer));
		if (result != STATE_OK)
			return result;

		uptime_raw_hours = strtod (recv_buffer, NULL);
		uptime_raw_minutes = (unsigned long) (uptime_raw_hours * 60.0);

		if (check_critical_value == TRUE
				&& (uptime_raw_minutes <= critical_value)) result = STATE_CRITICAL;
		else if (check_warning_value == TRUE
						 && (uptime_raw_minutes <= warning_value)) result = STATE_WARNING;

		uptime_days = uptime_raw_minutes / 1440;
		uptime_raw_minutes %= 1440;
		uptime_hours = uptime_raw_minutes / 60;
		uptime_raw_minutes %= 60;
		uptime_minutes = uptime_raw_minutes;

		sprintf (output_message, "Uptime %s - Up %d days %d hours %d minutes",
						 (result == STATE_OK) ? "ok" : "problem", uptime_days,
						 uptime_hours, uptime_minutes);
	}

	else {
		strcpy (output_message, "Nothing to check!\n");
		result = STATE_UNKNOWN;
	}

	/* reset timeout */
	alarm (0);

	printf ("%s\n", output_message);

	return result;
}





/* process command-line arguments */
int
process_arguments (int argc, char **argv)
{
	int c;

#ifdef HAVE_GETOPT_H
	int option_index = 0;
	static struct option long_options[] = {
		{"port", required_argument, 0, 'p'},
		{"timeout", required_argument, 0, 't'},
		{"critical", required_argument, 0, 'c'},
		{"warning", required_argument, 0, 'w'},
		{"variable", required_argument, 0, 'v'},
		{"hostname", required_argument, 0, 'H'},
		{"version", no_argument, 0, 'V'},
		{"help", no_argument, 0, 'h'},
		{0, 0, 0, 0}
	};
#endif

	/* no options were supplied */
	if (argc < 2)
		return ERROR;

	/* backwards compatibility */
	if (!is_option (argv[1])) {
		server_address = argv[1];
		argv[1] = argv[0];
		argv = &argv[1];
		argc--;
	}

	for (c = 1; c < argc; c++) {
		if (strcmp ("-to", argv[c]) == 0)
			strcpy (argv[c], "-t");
		else if (strcmp ("-wv", argv[c]) == 0)
			strcpy (argv[c], "-w");
		else if (strcmp ("-cv", argv[c]) == 0)
			strcpy (argv[c], "-c");
	}

	while (1) {
#ifdef HAVE_GETOPT_H
		c =
			getopt_long (argc, argv, "+hVH:t:c:w:p:v:", long_options,
									 &option_index);
#else
		c = getopt (argc, argv, "+hVH:t:c:w:p:v:");
#endif

		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", my_basename (argv[0]), optarg);
			print_usage ();
			exit (STATE_UNKNOWN);
		case 'h':									/* help */
			print_help ();
			exit (STATE_OK);
		case 'V':									/* version */
			print_revision (my_basename (argv[0]), "$Revision$");
			exit (STATE_OK);
		case 'H':									/* hostname */
			server_address = optarg;
			break;
		case 'p':									/* port */
			if (is_intnonneg (optarg))
				server_port = atoi (optarg);
			else
				terminate (STATE_UNKNOWN,
									 "Server port an integer (seconds)\nType '%s -h' for additional help\n",
									 PROGNAME);
			break;
		case 'v':									/* variable */
			if (strcmp (optarg, "LOAD1") == 0)
				vars_to_check = CHECK_LOAD1;
			else if (strcmp (optarg, "LOAD5") == 0)
				vars_to_check = CHECK_LOAD5;
			else if (strcmp (optarg, "LOAD15") == 0)
				vars_to_check = CHECK_LOAD15;
			else if (strcmp (optarg, "UPTIME") == 0)
				vars_to_check = CHECK_UPTIME;
			else if (strstr (optarg, "PROC") == optarg) {
				vars_to_check = CHECK_PROCS;
				process_name = strscpy (process_name, optarg + 4);
			}
			else if (strstr (optarg, "NET") == optarg) {
				vars_to_check = CHECK_NETSTAT;
				netstat_port = atoi (optarg + 3);
			}
			else if (strstr (optarg, "DPU") == optarg) {
				vars_to_check = CHECK_DPU;
				disk_name = strscpy (disk_name, optarg + 3);
			}
			else
				return ERROR;
			break;
		case 'w':									/* warning threshold */
			warning_value = strtoul (optarg, NULL, 10);
			check_warning_value = TRUE;
			break;
		case 'c':									/* critical threshold */
			critical_value = strtoul (optarg, NULL, 10);
			check_critical_value = TRUE;
			break;
		case 't':									/* timeout */
			socket_timeout = atoi (optarg);
			if (socket_timeout <= 0)
				return ERROR;
		}

	}
	return OK;
}





void
print_usage (void)
{
	printf
		("Usage: %s -H host [-p port] [-v variable] [-w warning] [-c critical] [-t timeout]\n",
		 PROGNAME);
}





void
print_help (void)
{
	print_revision (PROGNAME, "$Revision$");
	printf
		("Copyright (c) 2000 Ethan Galstad/Karl DeBisschop\n\n"
		 "This plugin attempts to contact the Over-CR collector daemon running on the\n"
		 "remote UNIX server in order to gather the requested system information. This\n"
		 "plugin requres that Eric Molitors' Over-CR collector daemon be running on the\n"
		 "remote server. Over-CR can be downloaded from http://www.molitor.org/overcr\n"
		 "(This plugin was tested with version 0.99.53 of the Over-CR collector)\n\n");
	print_usage ();
	printf
		("\nOptions:\n"
		 "-H, --hostname=HOST\n"
		 "   Name of the host to check\n"
		 "-p, --port=INTEGER\n"
		 "   Optional port number (default: %d)\n"
		 "-v, --variable=STRING\n"
		 "   Variable to check.  Valid variables include:\n"
		 "     LOAD1         = 1 minute average CPU load\n"
		 "     LOAD5         = 5 minute average CPU load\n"
		 "     LOAD15        = 15 minute average CPU load\n"
		 "     DPU<filesys>  = percent used disk space on filesystem <filesys>\n"
		 "     PROC<process> = number of running processes with name <process>\n"
		 "     NET<port>     = number of active connections on TCP port <port>\n"
		 "     UPTIME        = system uptime in seconds\n"
		 " -w, --warning=INTEGER\n"
		 "   Threshold which will result in a warning status\n"
		 " -c, --critical=INTEGER\n"
		 "   Threshold which will result in a critical status\n"
		 " -t, --timeout=INTEGER\n"
		 "   Seconds before connection attempt times out (default: %d)\n"
		 "-h, --help\n"
		 "   Print this help screen\n"
		 "-V, --version\n"
		 "   Print version information\n\n"
		 "Notes:\n"
		 " - For the available options, the critical threshold value should always be\n"
		 "   higher than the warning threshold value, EXCEPT with the uptime variable\n"
		 "   (i.e. lower uptimes are worse).\n", PORT, DEFAULT_SOCKET_TIMEOUT);
}