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check_mrtgtraf.c

/******************************************************************************

 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.
 
 $Id: check_mrtgtraf.c,v 1.24 2004/12/25 23:17:44 opensides Exp $

******************************************************************************/

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

const char *progname = "check_mrtgtraf";
const char *revision = "$Revision: 1.24 $";
const char *copyright = "1999-2004";
const char *email = "nagiosplug-devel@lists.sourceforge.net";

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

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;


int
main (int argc, char **argv)
{
      int result = STATE_UNKNOWN;
      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;
      char incoming_speed_rating[8];
      char outgoing_speed_rating[8];

      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);

            /* grab the average incoming transfer rate */
            temp_buffer = strtok (NULL, " ");
            average_incoming_rate = strtoul (temp_buffer, NULL, 10);

            /* grab the average outgoing transfer rate */
            temp_buffer = strtok (NULL, " ");
            average_outgoing_rate = strtoul (temp_buffer, NULL, 10);

            /* grab the maximum incoming transfer rate */
            temp_buffer = strtok (NULL, " ");
            maximum_incoming_rate = strtoul (temp_buffer, NULL, 10);

            /* grab the maximum outgoing transfer rate */
            temp_buffer = strtok (NULL, " ");
            maximum_outgoing_rate = strtoul (temp_buffer, NULL, 10);
      }

      /* 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) {
            incoming_rate = average_incoming_rate;
            outgoing_rate = average_outgoing_rate;
      }
      else {
            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/s");
            adjusted_incoming_rate = (double) incoming_rate;
      }

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

      /* report incoming traffic in MBytes/sec */
      else {
            strcpy (incoming_speed_rating, "MB/s");
            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/s");
            adjusted_outgoing_rate = (double) outgoing_rate;
      }

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

      /* report outgoing traffic in MBytes/sec */
      else {
            strcpy (outgoing_speed_rating, "MB/s");
            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;
      }

      asprintf (&error_message, _("%s. In = %0.1f %s, %s. Out = %0.1f %s|%s %s\n"),
                (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("in", adjusted_outgoing_rate, outgoing_speed_rating,
                         (int)outgoing_warning_threshold, outgoing_warning_threshold,
                         (int)outgoing_critical_threshold, outgoing_critical_threshold,
                         TRUE, 0, FALSE, 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[] = {
            {"logfile", required_argument, 0, 'F'},
            {"expires", required_argument, 0, 'e'},
            {"aggregation", required_argument, 0, 'a'},
            {"variable", required_argument, 0, 'v'},
            {"critical", required_argument, 0, 'c'},
            {"warning", required_argument, 0, 'w'},
            {"verbose", no_argument, 0, 'v'},
            {"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, "hVF: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 'V':                                                   /* version */
                  print_revision (progname, revision);
                  exit (STATE_OK);
            case 'h':                                                   /* help */
                  print_help ();
                  exit (STATE_OK);
            case '?':                                                   /* help */
                  usage2 (_("Unknown argument"), optarg);
            }
      }

      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, revision);

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

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

      print_usage ();

      printf (_(UT_HELP_VRSN));

      printf (_("\
 -F, --filename=STRING\n\
   File to read log from\n\
 -e, --expires=INTEGER\n\
   Minutes after which log expires\n\
 -a, --aggregation=(AVG|MAX)\n\
   Test average or maximum\n\
 -w, --warning\n\
   Warning threshold pair \"<incoming>,<outgoing>\"\n\
 -c, --critical\n\
   Critical threshold pair \"<incoming>,<outgoing>\"\n"));

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

      printf (_(UT_SUPPORT));
}



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

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