/******************************************************************************
*
* CHECK_UPS.C
*
* Program: UPS monitor plugin for Nagios
* License: GPL
* Copyright (c) 1999 Ethan Galstad (nagios@nagios.org)
*
* Last Modified: $Date$
*
* Command line: CHECK_UPS <host_address> [-u ups] [-p port] [-v variable] \
*			   [-wv warn_value] [-cv crit_value] [-to to_sec]
*
* Description:
*

* This plugin attempts to determine the status of an UPS
* (Uninterruptible Power Supply) on a remote host (or the local host)
* that is being monitored with Russel Kroll's "Smarty UPS Tools"
* package. If the UPS is online or calibrating, the plugin will
* return an OK state. If the battery is on it will return a WARNING
* state.  If the UPS is off or has a low battery the plugin will
* return a CRITICAL state.  You may also specify a variable to check
* (such as temperature, utility voltage, battery load, etc.)  as well
* as warning and critical thresholds for the value of that variable.
* If the remote host has multiple UPS that are being monitored you
* will have to use the [ups] option to specify which UPS to check.
*
* Notes:
*
* This plugin requires that the UPSD daemon distributed with Russel
* Kroll's "Smart UPS Tools" be installed on the remote host.  If you
* don't have the package installed on your system, you can download
* it from http://www.exploits.org/~rkroll/smartupstools
*
* 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 PROGNAME "check_ups"

#define CHECK_NONE	0

#define PORT	3305

#define UPS_NONE	0							/* no supported options */
#define UPS_UTILITY	1						/* supports utility line voltage */
#define UPS_BATTPCT	2						/* supports percent battery remaining */
#define UPS_STATUS	4						/* supports UPS status */
#define UPS_TEMP	8							/* supports UPS temperature */
#define UPS_LOADPCT	16					/* supports load percent */

#define UPSSTATUS_NONE		0
#define UPSSTATUS_OFF		1
#define UPSSTATUS_OL		2
#define UPSSTATUS_OB		4
#define UPSSTATUS_LB		8
#define UPSSTATUS_CAL		16
#define UPSSTATUS_UNKOWN	32

int server_port = PORT;
char *server_address = NULL;
char *ups_name = NULL;
double warning_value = 0.0L;
double critical_value = 0.0L;
int check_warning_value = FALSE;
int check_critical_value = FALSE;
int check_variable = UPS_NONE;
int supported_options = UPS_NONE;
int status = UPSSTATUS_NONE;

double ups_utility_voltage = 0.0L;
double ups_battery_percent = 0.0L;
double ups_load_percent = 0.0L;
double ups_temperature = 0.0L;
char ups_status[MAX_INPUT_BUFFER] = "N/A";

int determine_status (void);
int determine_supported_vars (void);
int get_ups_variable (const char *, char *, int);

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

int
main (int argc, char **argv)
{
	int result = STATE_OK;
	char output_message[MAX_INPUT_BUFFER];
	char temp_buffer[MAX_INPUT_BUFFER];

	double ups_utility_deviation = 0.0L;

	if (process_arguments (argc, argv) != OK)
		usage ("Invalid command arguments supplied\n");

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

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

	/* determine what variables the UPS supports */
	if (determine_supported_vars () != OK)
		return STATE_CRITICAL;

	/* get the ups status if possible */
	if (supported_options & UPS_STATUS) {

		if (determine_status () != OK)
			return STATE_CRITICAL;
		ups_status[0] = 0;
		result = STATE_OK;

		if (status & UPSSTATUS_OFF) {
			strcpy (ups_status, "Off");
			result = STATE_CRITICAL;
		}
		else if ((status & (UPSSTATUS_OB | UPSSTATUS_LB)) ==
						 (UPSSTATUS_OB | UPSSTATUS_LB)) {
			strcpy (ups_status, "On Battery, Low Battery");
			result = STATE_CRITICAL;
		}
		else {
			if (status & UPSSTATUS_OL) {
				strcat (ups_status, "Online");
			}
			if (status & UPSSTATUS_OB) {
				strcat (ups_status, "On Battery");
				result = STATE_WARNING;
			}
			if (status & UPSSTATUS_LB) {
				strcat (ups_status, ", Low Battery");
				result = STATE_WARNING;
			}
			if (status & UPSSTATUS_CAL) {
				strcat (ups_status, ", Calibrating");
			}
			if (status & UPSSTATUS_UNKOWN) {
				strcat (ups_status, ", Unknown");
			}
		}
	}

	/* get the ups utility voltage if possible */
	if (supported_options & UPS_UTILITY) {

		if (get_ups_variable ("UTILITY", temp_buffer, sizeof (temp_buffer)) != OK)
			return STATE_CRITICAL;

		ups_utility_voltage = atof (temp_buffer);

		if (ups_utility_voltage > 120.0)
			ups_utility_deviation = 120.0 - ups_utility_voltage;
		else
			ups_utility_deviation = ups_utility_voltage - 120.0;

		if (check_variable == UPS_UTILITY) {
			if (check_critical_value == TRUE
					&& ups_utility_deviation >= critical_value) result = STATE_CRITICAL;
			else if (check_warning_value == TRUE
							 && ups_utility_deviation >= warning_value
							 && result < STATE_WARNING) result = STATE_WARNING;
		}
	}

	/* get the ups battery percent if possible */
	if (supported_options & UPS_BATTPCT) {

		if (get_ups_variable ("BATTPCT", temp_buffer, sizeof (temp_buffer)) != OK)
			return STATE_CRITICAL;

		ups_battery_percent = atof (temp_buffer);

		if (check_variable == UPS_BATTPCT) {
			if (check_critical_value == TRUE
					&& ups_battery_percent <= critical_value) result = STATE_CRITICAL;
			else if (check_warning_value == TRUE
							 && ups_battery_percent <= warning_value
							 && result < STATE_WARNING) result = STATE_WARNING;
		}
	}

	/* get the ups load percent if possible */
	if (supported_options & UPS_LOADPCT) {

		if (get_ups_variable ("LOADPCT", temp_buffer, sizeof (temp_buffer)) != OK)
			return STATE_CRITICAL;

		ups_load_percent = atof (temp_buffer);

		if (check_variable == UPS_LOADPCT) {
			if (check_critical_value == TRUE && ups_load_percent >= critical_value)
				result = STATE_CRITICAL;
			else if (check_warning_value == TRUE
							 && ups_load_percent >= warning_value && result < STATE_WARNING)
				result = STATE_WARNING;
		}
	}

	/* get the ups temperature if possible */
	if (supported_options & UPS_TEMP) {

		if (get_ups_variable ("UPSTEMP", temp_buffer, sizeof (temp_buffer)) != OK)
			return STATE_CRITICAL;

		ups_temperature = (atof (temp_buffer) * 1.8) + 32;

		if (check_variable == UPS_TEMP) {
			if (check_critical_value == TRUE && ups_temperature >= critical_value)
				result = STATE_CRITICAL;
			else if (check_warning_value == TRUE && ups_temperature >= warning_value
							 && result < STATE_WARNING)
				result = STATE_WARNING;
		}
	}

	/* if the UPS does not support any options we are looking for, report an error */
	if (supported_options == UPS_NONE)
		result = STATE_CRITICAL;

	/* reset timeout */
	alarm (0);


	sprintf (output_message, "UPS %s - ",
					 (result == STATE_OK) ? "ok" : "problem");

	if (supported_options & UPS_STATUS) {
		sprintf (temp_buffer, "Status=%s ", ups_status);
		strcat (output_message, temp_buffer);
	}
	if (supported_options & UPS_UTILITY) {
		sprintf (temp_buffer, "Utility=%3.1fV ", ups_utility_voltage);
		strcat (output_message, temp_buffer);
	}
	if (supported_options & UPS_BATTPCT) {
		sprintf (temp_buffer, "Batt=%3.1f%% ", ups_battery_percent);
		strcat (output_message, temp_buffer);
	}
	if (supported_options & UPS_LOADPCT) {
		sprintf (temp_buffer, "Load=%3.1f%% ", ups_load_percent);
		strcat (output_message, temp_buffer);
	}
	if (supported_options & UPS_TEMP) {
		sprintf (temp_buffer, "Temp=%3.1fF", ups_temperature);
		strcat (output_message, temp_buffer);
	}
	if (supported_options == UPS_NONE) {
		sprintf (temp_buffer,
						 "UPS does not appear to support any available options\n");
		strcat (output_message, temp_buffer);
	}

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

	return result;
}



/* determines what options are supported by the UPS */
int
determine_status (void)
{
	char recv_buffer[MAX_INPUT_BUFFER];
	char temp_buffer[MAX_INPUT_BUFFER];
	char *ptr;

	if (get_ups_variable ("STATUS", recv_buffer, sizeof (recv_buffer)) !=
			STATE_OK) {
		printf ("Invalid response received from hostn");
		return ERROR;
	}

	recv_buffer[strlen (recv_buffer) - 1] = 0;

	strcpy (temp_buffer, recv_buffer);
	for (ptr = (char *) strtok (temp_buffer, " "); ptr != NULL;
			 ptr = (char *) strtok (NULL, " ")) {
		if (!strcmp (ptr, "OFF"))
			status |= UPSSTATUS_OFF;
		else if (!strcmp (ptr, "OL"))
			status |= UPSSTATUS_OL;
		else if (!strcmp (ptr, "OB"))
			status |= UPSSTATUS_OB;
		else if (!strcmp (ptr, "LB"))
			status |= UPSSTATUS_LB;
		else if (!strcmp (ptr, "CAL"))
			status |= UPSSTATUS_CAL;
		else
			status |= UPSSTATUS_UNKOWN;
	}

	return OK;
}


/* determines what options are supported by the UPS */
int
determine_supported_vars (void)
{
	char send_buffer[MAX_INPUT_BUFFER];
	char recv_buffer[MAX_INPUT_BUFFER];
	char temp_buffer[MAX_INPUT_BUFFER];
	char *ptr;


	/* get the list of variables that this UPS supports */
	if (ups_name)
		sprintf (send_buffer, "LISTVARS %s\r\n", ups_name);
	else
		sprintf (send_buffer, "LISTVARS\r\n");
	if (process_tcp_request
			(server_address, server_port, send_buffer, recv_buffer,
			 sizeof (recv_buffer)) != STATE_OK) {
		printf ("Invalid response received from host\n");
		return ERROR;
	}

	recv_buffer[strlen (recv_buffer) - 1] = 0;

	if (ups_name)
		ptr = recv_buffer + 5 + strlen (ups_name) + 2;
	else
		ptr = recv_buffer + 5;

	strcpy (temp_buffer, recv_buffer);

	for (ptr = (char *) strtok (temp_buffer, " "); ptr != NULL;
			 ptr = (char *) strtok (NULL, " ")) {
		if (!strcmp (ptr, "UTILITY"))
			supported_options |= UPS_UTILITY;
		else if (!strcmp (ptr, "BATTPCT"))
			supported_options |= UPS_BATTPCT;
		else if (!strcmp (ptr, "LOADPCT"))
			supported_options |= UPS_LOADPCT;
		else if (!strcmp (ptr, "STATUS"))
			supported_options |= UPS_STATUS;
		else if (!strcmp (ptr, "UPSTEMP"))
			supported_options |= UPS_TEMP;
	}

	return OK;
}


/* gets a variable value for a specific UPS  */
int
get_ups_variable (const char *varname, char *buf, int buflen)
{
	/*  char command[MAX_INPUT_BUFFER]; */
	char temp_buffer[MAX_INPUT_BUFFER];
	char send_buffer[MAX_INPUT_BUFFER];
	char *ptr;

	/* create the command string to send to the UPS daemon */
	if (ups_name)
		sprintf (send_buffer, "REQ %s@%s\n", varname, ups_name);
	else
		sprintf (send_buffer, "REQ %s\n", varname);

	/* send the command to the daemon and get a response back */
	if (process_tcp_request
			(server_address, server_port, send_buffer, temp_buffer,
			 sizeof (temp_buffer)) != STATE_OK) {
		printf ("Invalid response received from host\n");
		return ERROR;
	}

	if (ups_name)
		ptr = temp_buffer + strlen (varname) + 5 + strlen (ups_name) + 1;
	else
		ptr = temp_buffer + strlen (varname) + 5;

	if (!strcmp (ptr, "NOT-SUPPORTED")) {
		printf ("Error: Variable '%s' is not supported\n", varname);
		return ERROR;
	}

	if (!strcmp (ptr, "DATA-STALE")) {
		printf ("Error: UPS data is stale\n");
		return ERROR;
	}

	if (!strcmp (ptr, "UNKNOWN-UPS")) {
		if (ups_name)
			printf ("Error: UPS '%s' is unknown\n", ups_name);
		else
			printf ("Error: UPS is unknown\n");
		return ERROR;
	}

	strncpy (buf, ptr, buflen - 1);
	buf[buflen - 1] = 0;

	return OK;
}





/* Command line: CHECK_UPS <host_address> [-u ups] [-p port] [-v variable] 
			   [-wv warn_value] [-cv crit_value] [-to to_sec] */


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

	if (argc < 2)
		return ERROR;

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

	c = 0;
	while ((c += (call_getopt (argc - c, &argv[c]))) < argc) {

		if (is_option (argv[c]))
			continue;

		if (server_address == NULL) {
			if (is_host (argv[c])) {
				server_address = argv[c];
			}
			else {
				usage ("Invalid host name");
			}
		}
	}

	if (server_address == NULL)
		server_address = strscpy (NULL, "127.0.0.1");

	return validate_arguments ();
}






int
call_getopt (int argc, char **argv)
{
	int c, i = 0;

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

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

		i++;

		if (c == -1 || c == EOF || c == 1)
			break;

		switch (c) {
		case 'H':
		case 'u':
		case 'p':
		case 'v':
		case 'c':
		case 'w':
		case 't':
			i++;
		}

		switch (c) {
		case '?':									/* help */
			usage ("Invalid argument\n");
		case 'H':									/* hostname */
			if (is_host (optarg)) {
				server_address = optarg;
			}
			else {
				usage ("Invalid host name\n");
			}
			break;
		case 'u':									/* ups name */
			ups_name = optarg;
			break;
		case 'p':									/* port */
			if (is_intpos (optarg)) {
				server_port = atoi (optarg);
			}
			else {
				usage ("Server port must be a positive integer\n");
			}
			break;
		case 'c':									/* critical time threshold */
			if (is_intnonneg (optarg)) {
				critical_value = atoi (optarg);
				check_critical_value = TRUE;
			}
			else {
				usage ("Critical time must be a nonnegative integer\n");
			}
			break;
		case 'w':									/* warning time threshold */
			if (is_intnonneg (optarg)) {
				warning_value = atoi (optarg);
				check_warning_value = TRUE;
			}
			else {
				usage ("Warning time must be a nonnegative integer\n");
			}
			break;
		case 'v':									/* variable */
			if (!strcmp (optarg, "LINE"))
				check_variable = UPS_UTILITY;
			else if (!strcmp (optarg, "TEMP"))
				check_variable = UPS_TEMP;
			else if (!strcmp (optarg, "BATTPCT"))
				check_variable = UPS_BATTPCT;
			else if (!strcmp (optarg, "LOADPCT"))
				check_variable = UPS_LOADPCT;
			else
				usage ("Unrecognized UPS variable\n");
			break;
		case 't':									/* timeout */
			if (is_intnonneg (optarg)) {
				socket_timeout = atoi (optarg);
			}
			else {
				usage ("Time interval must be a nonnegative integer\n");
			}
			break;
		case 'V':									/* version */
			print_revision (PROGNAME, "$Revision$");
			exit (STATE_OK);
		case 'h':									/* help */
			print_help ();
			exit (STATE_OK);
		}
	}
	return i;
}





int
validate_arguments (void)
{
	return OK;
}





void
print_help (void)
{
	print_revision (PROGNAME, "$Revision$");
	printf
		("Copyright (c) 2000 Tom Shields/Karl DeBisschop\n\n"
		 "This plugin tests the UPS service on the specified host.\n\n");
	print_usage ();
	printf
		("\nOptions:\n"
		 " -H, --hostname=STRING or IPADDRESS\n"
		 "   Check server on the indicated host\n"
		 " -p, --port=INTEGER\n"
		 "   Make connection on the indicated port (default: %d)\n"
		 " -u, --ups=STRING\n"
		 "   Name of UPS\n"
		 " -w, --warning=INTEGER\n"
		 "   Seconds necessary to result in a warning status\n"
		 " -c, --critical=INTEGER\n"
		 "   Seconds necessary to result in a critical status\n"
		 " -t, --timeout=INTEGER\n"
		 "   Seconds before connection attempt times out (default: %d)\n"
		 " -v, --verbose\n"
		 "   Print extra information (command-line use only)\n"
		 " -h, --help\n"
		 "   Print detailed help screen\n"
		 " -V, --version\n"
		 "   Print version information\n\n", PORT, DEFAULT_SOCKET_TIMEOUT);
	support ();
}





void
print_usage (void)
{
	printf
		("Usage: %s -H host [-e expect] [-p port] [-w warn] [-c crit]\n"
		 "            [-t timeout] [-v]\n"
		 "       %s --help\n"
		 "       %s --version\n", PROGNAME, PROGNAME, PROGNAME);
}