/*****************************************************************************
* 
* Nagios check_mrtgtraf plugin
* 
* License: GPL
* Copyright (c) 1999-2014 Nagios Plugins Development Team
* 
* Description:
* 
* This file contains the check_mtrgtraf plugin
* 
* This plugin will check the incoming/outgoing transfer rates of a router
* switch, etc recorded in an MRTG log.
* 
* 
* 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/>.
* 
* 
*****************************************************************************/

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

const char *progname = "check_mrtgtraf";
const char *copyright = "1999-2014";
const char *email = "devel@nagios-plugins.org";

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

int verbose = false;
char *log_file = NULL;
int expire_minutes = -1;
int use_average = TRUE;
unsigned long incoming_warning_threshold = 0L;
unsigned long incoming_critical_threshold = 0L;
unsigned long outgoing_warning_threshold = 0L;
unsigned long outgoing_critical_threshold = 0L;
unsigned long max_interface_bandwidth = 0L;


int
main (int argc, char **argv)
{
	int result = STATE_OK;
	FILE *fp;
	int line;
	char input_buffer[MAX_INPUT_BUFFER];
	char *temp_buffer;
	time_t current_time;
	char *error_message;
	time_t timestamp = 0L;
	unsigned long average_incoming_rate = 0L;
	unsigned long average_outgoing_rate = 0L;
	unsigned long maximum_incoming_rate = 0L;
	unsigned long maximum_outgoing_rate = 0L;
	unsigned long incoming_rate = 0L;
	unsigned long outgoing_rate = 0L;
	double adjusted_incoming_rate = 0.0;
	double adjusted_outgoing_rate = 0.0;
	double incoming_percent = 0.0;
	double outgoing_percent = 0.0;
	char incoming_speed_rating[8];
	char outgoing_speed_rating[8];

	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"));

	/* open the MRTG log file for reading */
	fp = fopen (log_file, "r");
	if (fp == NULL)
		usage4 (_("Unable to open MRTG log file"));

	line = 0;

	while (fgets (input_buffer, MAX_INPUT_BUFFER - 1, fp)) {

		line++;

		/* skip the first line of the log file */
		if (line == 1)
			continue;

		/* break out of read loop */
		/* if we've passed the number of entries we want to read */
		if (line > 2)
			break;

		/* grab the timestamp */
		temp_buffer = strtok (input_buffer, " ");
		timestamp = strtoul (temp_buffer, NULL, 10);
		if (verbose)
			printf("%s %lu\n", _("Found timestamp of:"), timestamp);

		/* grab the average incoming transfer rate */
		temp_buffer = strtok (NULL, " ");
		average_incoming_rate = strtoul (temp_buffer, NULL, 10);
		if (verbose)
			printf("%s %lu\n", _("Found average incoming rate of:"), average_incoming_rate);

		/* grab the average outgoing transfer rate */
		temp_buffer = strtok (NULL, " ");
		average_outgoing_rate = strtoul (temp_buffer, NULL, 10);
		if (verbose)
			printf("%s %lu\n", _("Found average outgoing rate of:"), average_outgoing_rate);

		/* grab the maximum incoming transfer rate */
		temp_buffer = strtok (NULL, " ");
		maximum_incoming_rate = strtoul (temp_buffer, NULL, 10);
		if (verbose)
			printf("%s %lu\n", _("Found maximum incoming rate of:"), maximum_incoming_rate);

		/* grab the maximum outgoing transfer rate */
		temp_buffer = strtok (NULL, " ");
		maximum_outgoing_rate = strtoul (temp_buffer, NULL, 10);
		if (verbose)
			printf("%s %lu\n", _("Found maximum outgoing rate of:"), maximum_outgoing_rate);
	}

	/* close the log file */
	fclose (fp);

	/* if we couldn't read enough data, return an unknown error */
	if (line <= 2)
		usage4 (_("Unable to process MRTG log file"));

	/* make sure the MRTG data isn't too old */
	time (&current_time);
	if ((expire_minutes > 0) &&
	    (current_time - timestamp) > (expire_minutes * 60))
		die (STATE_WARNING,	_("MRTG data has expired (%d minutes old)\n"),
		     (int) ((current_time - timestamp) / 60));

	/* else check the incoming/outgoing rates */
	if (use_average == TRUE) {
		if (verbose) printf("%s\n", _("Using average rates not maximum."));
		incoming_rate = average_incoming_rate;
		outgoing_rate = average_outgoing_rate;
	}
	else {
		if (verbose) printf("%s\n", _("Using default maximum rates."));
		incoming_rate = maximum_incoming_rate;
		outgoing_rate = maximum_outgoing_rate;
	}

	/* report incoming traffic in Bytes/sec */
	if (incoming_rate < 1024) {
		strcpy (incoming_speed_rating, "B");
		adjusted_incoming_rate = (double) incoming_rate;
	}

	/* report incoming traffic in KBytes/sec */
	else if (incoming_rate < (1024 * 1024)) {
		strcpy (incoming_speed_rating, "KB");
		adjusted_incoming_rate = (double) (incoming_rate / 1024.0);
	}

	/* report incoming traffic in MBytes/sec */
	else {
		strcpy (incoming_speed_rating, "MB");
		adjusted_incoming_rate = (double) (incoming_rate / 1024.0 / 1024.0);
	}

	/* report outgoing traffic in Bytes/sec */
	if (outgoing_rate < 1024) {
		strcpy (outgoing_speed_rating, "B");
		adjusted_outgoing_rate = (double) outgoing_rate;
	}

	/* report outgoing traffic in KBytes/sec */
	else if (outgoing_rate < (1024 * 1024)) {
		strcpy (outgoing_speed_rating, "KB");
		adjusted_outgoing_rate = (double) (outgoing_rate / 1024.0);
	}

	/* report outgoing traffic in MBytes/sec */
	else {
		strcpy (outgoing_speed_rating, "MB");
		adjusted_outgoing_rate = (double) (outgoing_rate / 1024.0 / 1024.0);
	}

	if (incoming_rate > incoming_critical_threshold
			|| outgoing_rate > outgoing_critical_threshold) {
		result = STATE_CRITICAL;
	}
	else if (incoming_rate > incoming_warning_threshold
					 || outgoing_rate > outgoing_warning_threshold) {
		result = STATE_WARNING;
	}

	xasprintf (&error_message, _("%s. In = %0.1f %s/s, %s. Out = %0.1f %s/s|%s %s"),
	          (use_average == TRUE) ? _("Avg") : _("Max"), adjusted_incoming_rate,
	          incoming_speed_rating, (use_average == TRUE) ? _("Avg") : _("Max"),
	          adjusted_outgoing_rate, outgoing_speed_rating,
	          fperfdata("in", adjusted_incoming_rate, incoming_speed_rating,
	                   (int)incoming_warning_threshold, incoming_warning_threshold,
	                   (int)incoming_critical_threshold, incoming_critical_threshold,
	                   TRUE, 0, FALSE, 0),
	          fperfdata("out", adjusted_outgoing_rate, outgoing_speed_rating,
	                   (int)outgoing_warning_threshold, outgoing_warning_threshold,
	                   (int)outgoing_critical_threshold, outgoing_critical_threshold,
	                   TRUE, 0, FALSE, 0));
	if (max_interface_bandwidth) {
		incoming_percent = (incoming_rate * 100.0) / (double)max_interface_bandwidth;
		outgoing_percent = (incoming_rate * 100.0) / (double)max_interface_bandwidth;
		xasprintf(&error_message, "%s %s %s", error_message,
			fperfdata("in_pct", incoming_percent, "%",
					 FALSE, 0.0, FALSE, 0.0,
					 TRUE, 0.0, TRUE, 100.0),
			fperfdata("out_pct", outgoing_percent, "%",
					 FALSE, 0.0, FALSE, 0.0,
					 TRUE, 0.0, TRUE, 100.0));
	}

	printf (_("Traffic %s - %s\n"), state_text(result), error_message);

	return result;
}



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

	int option = 0;
	static struct option longopts[] = {
		{"filename", required_argument, 0, 'F'},
		{"expires", required_argument, 0, 'e'},
		{"aggregation", required_argument, 0, 'a'},
		{"critical", required_argument, 0, 'c'},
		{"warning", required_argument, 0, 'w'},
		{"verbose", no_argument, 0, 'v'},
		{"interface-maximum", required_argument, 0, 'i'},
		{"version", no_argument, 0, 'V'},
		{"help", no_argument, 0, 'h'},
		{0, 0, 0, 0}
	};

	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");
	}

	while (1) {
		c = getopt_long (argc, argv, "hVvF:e:a:c:w:", longopts, &option);

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

		switch (c) {
		case 'F':									/* input file */
			log_file = optarg;
			break;
		case 'e':									/* expiration time */
			expire_minutes = atoi (optarg);
			break;
		case 'a':									/* aggregation (AVE or MAX) */
			if (!strcmp (optarg, "MAX"))
				use_average = FALSE;
			else
				use_average = TRUE;
			break;
		case 'c':									/* warning threshold */
			sscanf (optarg, "%lu,%lu", &incoming_critical_threshold,
							&outgoing_critical_threshold);
			break;
		case 'w':									/* critical threshold */
			sscanf (optarg, "%lu,%lu", &incoming_warning_threshold,
							&outgoing_warning_threshold);
			break;
		case 'i':                                   /* max interface bandwidth */
			max_interface_bandwidth = strtoul(optarg, NULL, 0);
			break;
		case 'v':
			verbose = true;
			break;
		case 'V':									/* version */
			print_revision (progname, NP_VERSION);
			exit (STATE_OK);
		case 'h':									/* help */
			print_help ();
			exit (STATE_OK);
		case '?':									/* help */
			usage5 ();
		}
	}

	c = optind;
	if (argc > c && log_file == NULL) {
		log_file = argv[c++];
	}

	if (argc > c && expire_minutes == -1) {
		expire_minutes = atoi (argv[c++]);
	}

	if (argc > c && strcmp (argv[c], "MAX") == 0) {
		use_average = FALSE;
		c++;
	}
	else if (argc > c && strcmp (argv[c], "AVG") == 0) {
		use_average = TRUE;
		c++;
	}

	if (argc > c && incoming_warning_threshold == 0) {
		incoming_warning_threshold = strtoul (argv[c++], NULL, 10);
	}

	if (argc > c && incoming_critical_threshold == 0) {
		incoming_critical_threshold = strtoul (argv[c++], NULL, 10);
	}

	if (argc > c && outgoing_warning_threshold == 0) {
		outgoing_warning_threshold = strtoul (argv[c++], NULL, 10);
	}
	
	if (argc > c && outgoing_critical_threshold == 0) {
		outgoing_critical_threshold = strtoul (argv[c++], NULL, 10);
	}

	return validate_arguments ();
}


int
validate_arguments (void)
{
	return OK;
}


void
print_help (void)
{
  print_revision (progname, NP_VERSION);

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

  printf ("%s\n", _("This plugin will check the incoming/outgoing transfer rates of a router,"));
  printf ("%s\n", _("switch, etc recorded in an MRTG log.  If the newest log entry is older"));
  printf ("%s\n", _("than <expire_minutes>, a WARNING status is returned. If either the"));
  printf ("%s\n", _("incoming or outgoing rates exceed the <icl> or <ocl> thresholds (in"));
  printf ("%s\n", _("Bytes/sec), a CRITICAL status results.  If either of the rates exceed"));
  printf ("%s\n", _("the <iwl> or <owl> thresholds (in Bytes/sec), a WARNING status results."));

  printf ("\n\n");

  print_usage ();

  printf (UT_HELP_VRSN);
  printf (UT_EXTRA_OPTS);

  printf (" %s\n", "-F, --filename=STRING");
  printf ("    %s\n", _("File to read log from"));
  printf (" %s\n", "-e, --expires=INTEGER");
  printf ("    %s\n", _("Minutes after which log expires"));
  printf (" %s\n", "-a, --aggregation=(AVG|MAX)");
  printf ("    %s\n", _("Test average or maximum"));
  printf (" %s\n", "-w, --warning");
  printf ("    %s\n", _("Warning threshold pair <incoming>,<outgoing>"));
  printf (" %s\n", "-c, --critical");
  printf ("    %s\n", _("Critical threshold pair <incoming>,<outgoing>"));
  printf (" %s\n", _("-v, --verbose"));
  printf ("    %s\n", _("Verbose output during plugin runtime"));
  printf (" %s\n", _("-i, --interface-maximum"));
  printf ("    %s\n", _("Define the maximum bandwidth on the port being monitored (Bytes/sec)"));
  printf ("    %s\n", _("This adds percentages to performance data output"));

  printf ("\n");
  printf ("%s\n", _("Notes:"));
  printf (" %s\n", _("- MRTG stands for Multi Router Traffic Grapher. It can be downloaded from"));
  printf (" %s\n", "  http://ee-staff.ethz.ch/~oetiker/webtools/mrtg/mrtg.html");
  printf (" %s\n", _("- While MRTG can monitor things other than traffic rates, this"));
  printf (" %s\n", _("  plugin probably won't work with much else without modification."));
  printf (" %s\n", _("- The calculated i/o rates are a little off from what MRTG actually"));
  printf (" %s\n", _("  reports.  I'm not sure why this is right now, but will look into it"));
  printf (" %s\n", _("  for future enhancements of this plugin."));

  printf (UT_SUPPORT);
}



void
print_usage (void)
{
	printf (_("Usage"));
  printf (" %s -F <log_file> -a <AVG | MAX> -w <warning_pair>\n",progname);
  printf ("-c <critical_pair> [-e expire_minutes]\n");
}
