/*****************************************************************************
 *
 * Monitoring check_overcr plugin
 *
 * License: GPL
 * Copyright (c) 2000-2024 Monitoring Plugins Development Team
 *
 * Description:
 *
 * This file contains the check_overcr plugin
 *
 * This plugin attempts to contact the Over-CR collector daemon running on the
 * remote UNIX server in order to gather the requested system 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 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_overcr";
const char *copyright = "2000-2024";
const char *email = "devel@monitoring-plugins.org";

#include "common.h"
#include "netutils.h"
#include "utils.h"

enum checkvar {
	NONE,
	LOAD1,
	LOAD5,
	LOAD15,
	DPU,
	PROCS,
	NETSTAT,
	UPTIME
};

enum {
	PORT = 2000
};

static char *server_address = NULL;
static int server_port = PORT;
static double warning_value = 0L;
static double critical_value = 0L;
static bool check_warning_value = false;
static bool check_critical_value = false;
static enum checkvar vars_to_check = NONE;

static int netstat_port = 0;
static char *disk_name = NULL;
static char *process_name = NULL;
static char send_buffer[MAX_INPUT_BUFFER];
 
static int process_arguments(int, char **);
void print_usage(void);
static void print_help(void);

int main(int argc, char **argv) {
	int result = STATE_UNKNOWN;
	char recv_buffer[MAX_INPUT_BUFFER];
	char temp_buffer[MAX_INPUT_BUFFER];
	char *temp_ptr = NULL;
	bool 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;

	setlocale(LC_ALL, "");
	bindtextdomain(PACKAGE, LOCALEDIR);
	textdomain(PACKAGE);

	/* Parse extra opts if any */
	argv = np_extra_opts(&argc, argv, progname);

	if (process_arguments(argc, argv) == ERROR)
		usage4(_("Could not parse arguments"));

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

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

	result = process_tcp_request2(server_address, server_port, send_buffer, recv_buffer, sizeof(recv_buffer));

	switch (vars_to_check) {

	case LOAD1:
	case LOAD5:
	case LOAD15:

		if (result != STATE_OK)
			die(result, _("Unknown error fetching load data\n"));

		temp_ptr = (char *)strtok(recv_buffer, "\r\n");
		if (temp_ptr == NULL)
			die(STATE_CRITICAL, _("Invalid response from server - no load information\n"));
		else
			load_1min = strtod(temp_ptr, NULL);

		temp_ptr = (char *)strtok(NULL, "\r\n");
		if (temp_ptr == NULL)
			die(STATE_CRITICAL, _("Invalid response from server after load 1\n"));
		else
			load_5min = strtod(temp_ptr, NULL);

		temp_ptr = (char *)strtok(NULL, "\r\n");
		if (temp_ptr == NULL)
			die(STATE_CRITICAL, _("Invalid response from server after load 5\n"));
		else
			load_15min = strtod(temp_ptr, NULL);

		switch (vars_to_check) {
		case LOAD1:
			strcpy(temp_buffer, "1");
			load = load_1min;
			break;
		case LOAD5:
			strcpy(temp_buffer, "5");
			load = load_5min;
			break;
		default:
			strcpy(temp_buffer, "15");
			load = load_15min;
			break;
		}

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

		die(result, _("Load %s - %s-min load average = %0.2f"), state_text(result), temp_buffer, load);

		break;

	case DPU:

		if (result != STATE_OK)
			die(result, _("Unknown error fetching disk data\n"));

		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)
					die(STATE_CRITICAL, _("Invalid response from server\n"));
				else
					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)
			die(STATE_CRITICAL, "CRITICAL - Disk '%s' non-existent or not mounted", disk_name);

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

		die(result, "Disk %s - %lu%% used on %s", state_text(result), percent_used_disk_space, disk_name);

		break;

	case NETSTAT:

		if (result != STATE_OK)
			die(result, _("Unknown error fetching network status\n"));
		else
			port_connections = strtod(recv_buffer, NULL);

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

		die(result, _("Net %s - %d connection%s on port %d"), state_text(result), port_connections, (port_connections == 1) ? "" : "s",
			netstat_port);

		break;

	case PROCS:

		if (result != STATE_OK)
			die(result, _("Unknown error fetching process status\n"));

		temp_ptr = (char *)strtok(recv_buffer, "(");
		if (temp_ptr == NULL)
			die(STATE_CRITICAL, _("Invalid response from server\n"));

		temp_ptr = (char *)strtok(NULL, ")");
		if (temp_ptr == NULL)
			die(STATE_CRITICAL, _("Invalid response from server\n"));
		else
			processes = strtod(temp_ptr, NULL);

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

		die(result, _("Process %s - %d instance%s of %s running"), state_text(result), processes, (processes == 1) ? "" : "s",
			process_name);
		break;

	case UPTIME:

		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 && (uptime_raw_minutes <= critical_value))
			result = STATE_CRITICAL;
		else if (check_warning_value && (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;

		die(result, _("Uptime %s - Up %d days %d hours %d minutes"), state_text(result), uptime_days, uptime_hours, uptime_minutes);
		break;

	default:
		die(STATE_UNKNOWN, _("Nothing to check!\n"));
		break;
	}
}

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

	int option = 0;
	static struct option longopts[] = {
		{"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}};

	/* 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) {
		c = getopt_long(argc, argv, "+hVH:t:c:w:p:v:", 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_UNKNOWN);
		case 'V': /* version */
			print_revision(progname, NP_VERSION);
			exit(STATE_UNKNOWN);
		case 'H': /* hostname */
			server_address = optarg;
			break;
		case 'p': /* port */
			if (is_intnonneg(optarg))
				server_port = atoi(optarg);
			else
				die(STATE_UNKNOWN, _("Server port an integer\n"));
			break;
		case 'v': /* variable */
			if (strcmp(optarg, "LOAD") == 0) {
				strcpy(send_buffer, "LOAD\r\nQUIT\r\n");
				if (strcmp(optarg, "LOAD1") == 0)
					vars_to_check = LOAD1;
				else if (strcmp(optarg, "LOAD5") == 0)
					vars_to_check = LOAD5;
				else if (strcmp(optarg, "LOAD15") == 0)
					vars_to_check = LOAD15;
			} else if (strcmp(optarg, "UPTIME") == 0) {
				vars_to_check = UPTIME;
				strcpy(send_buffer, "UPTIME\r\n");
			} else if (strstr(optarg, "PROC") == optarg) {
				vars_to_check = PROCS;
				process_name = strscpy(process_name, optarg + 4);
				sprintf(send_buffer, "PROCESS %s\r\n", process_name);
			} else if (strstr(optarg, "NET") == optarg) {
				vars_to_check = NETSTAT;
				netstat_port = atoi(optarg + 3);
				sprintf(send_buffer, "NETSTAT %d\r\n", netstat_port);
			} else if (strstr(optarg, "DPU") == optarg) {
				vars_to_check = DPU;
				strcpy(send_buffer, "DISKSPACE\r\n");
				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_help(void) {
	char *myport;
	xasprintf(&myport, "%d", PORT);

	print_revision(progname, NP_VERSION);

	printf("Copyright (c) 1999 Ethan Galstad <nagios@nagios.org>\n");
	printf(COPYRIGHT, copyright, email);

	printf("%s\n", _("This plugin attempts to contact the Over-CR collector daemon running on the"));
	printf("%s\n", _("remote UNIX server in order to gather the requested system information."));

	printf("\n\n");

	print_usage();

	printf(UT_HELP_VRSN);
	printf(UT_EXTRA_OPTS);

	printf(UT_HOST_PORT, 'p', myport);

	printf(" %s\n", "-w, --warning=INTEGER");
	printf("    %s\n", _("Threshold which will result in a warning status"));
	printf(" %s\n", "-c, --critical=INTEGER");
	printf("    %s\n", _("Threshold which will result in a critical status"));
	printf(" %s\n", "-v, --variable=STRING");
	printf("    %s\n", _("Variable to check.  Valid variables include:"));
	printf("    %s\n", _("LOAD1         = 1 minute average CPU load"));
	printf("    %s\n", _("LOAD5         = 5 minute average CPU load"));
	printf("    %s\n", _("LOAD15        = 15 minute average CPU load"));
	printf("    %s\n", _("DPU<filesys>  = percent used disk space on filesystem <filesys>"));
	printf("    %s\n", _("PROC<process> = number of running processes with name <process>"));
	printf("    %s\n", _("NET<port>     = number of active connections on TCP port <port>"));
	printf("    %s\n", _("UPTIME        = system uptime in seconds"));

	printf(UT_CONN_TIMEOUT, DEFAULT_SOCKET_TIMEOUT);

	printf(UT_VERBOSE);

	printf("\n");
	printf("%s\n", _("This plugin requires that Eric Molitors' Over-CR collector daemon be"));
	printf("%s\n", _("running on the remote server."));
	printf("%s\n", _("Over-CR can be downloaded from http://www.molitor.org/overcr"));
	printf("%s\n", _("This plugin was tested with version 0.99.53 of the Over-CR collector"));

	printf("\n");
	printf("%s\n", _("Notes:"));
	printf(" %s\n", _("For the available options, the critical threshold value should always be"));
	printf(" %s\n", _("higher than the warning threshold value, EXCEPT with the uptime variable"));

	printf(UT_SUPPORT);
}

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