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/******************************************************************************
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* Program: MRTG (Multi-Router Traffic Grapher) generic plugin for Nagios
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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* $Id: check_mrtg.c,v 1.4 2003/01/13 12:15:16 kdebisschop Exp $
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*****************************************************************************/
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const char *progname = "check_mrtg";
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#define REVISION "$Revision: 1.4 $"
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#define COPYRIGHT "Copyright (c) 1999-2001 Ethan Galstad"
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This plugin will check either the average or maximum value of one of the\n\
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two variables recorded in an MRTG log file.\n"
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<log_file> <expire_minutes> <AVG|MAX> <variable> <vwl> <vcl> <label> [units] */
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-F log_file -a <AVG | MAX> -v variable -w warning -c critical\n\
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[-l label] [-u units] [-e expire_minutes] [-t timeout] [-v]"
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#define LONGOPTIONS "\
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The MRTG log file containing the data you want to monitor\n\
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-e, --expires=MINUTES\n\
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Minutes before MRTG data is considered to be too old\n\
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-a, --aggregation=AVG|MAX\n\
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Should we check average or maximum values?\n\
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-v, --variable=INTEGER\n\
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Which variable set should we inspect? 1 or 2?\n\
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-w, --warning=INTEGER\n\
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Threshold value for data to result in WARNING status\n\
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-c, --critical=INTEGER\n\
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Threshold value for data to result in CRITICAL status\n\
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Type label for data (Examples: Conns, \"Processor Load\", In, Out)\n\
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Option units label for data (Example: Packets/Sec, Errors/Sec, \n\
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\"Bytes Per Second\", \"%% Utilization\")\n\
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Print detailed help screen\n\
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Print version information\n"
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#define DESCRIPTION "\
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If the value exceeds the <vwl> threshold, a WARNING status is returned. If\n\
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the value exceeds the <vcl> threshold, a CRITICAL status is returned. If\n\
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the data in the log file is older than <expire_minutes> old, a WARNING\n\
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status is returned and a warning message is printed.\n\
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This plugin is useful for monitoring MRTG data that does not correspond to\n\
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bandwidth usage. (Use the check_mrtgtraf plugin for monitoring bandwidth).\n\
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It can be used to monitor any kind of data that MRTG is monitoring - errors,\n\
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packets/sec, etc. I use MRTG in conjuction with the Novell NLM that allows\n\
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me to track processor utilization, user connections, drive space, etc and\n\
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this plugin works well for monitoring that kind of data as well.\n\
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- This plugin only monitors one of the two variables stored in the MRTG log\n\
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file. If you want to monitor both values you will have to define two\n\
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commands with different values for the <variable> argument. Of course,\n\
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you can always hack the code to make this plugin work for you...\n\
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- MRTG stands for the Multi Router Traffic Grapher. It can be downloaded from\n\
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http://ee-staff.ethz.ch/~oetiker/webtools/mrtg/mrtg.html\n"
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int process_arguments (int, char **);
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int validate_arguments (void);
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void print_help (void);
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void print_usage (void);
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char *log_file = NULL;
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int expire_minutes = 0;
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int use_average = TRUE;
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int variable_number = -1;
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unsigned long value_warning_threshold = 0L;
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unsigned long value_critical_threshold = 0L;
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char *value_label = "";
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char *units_label = "";
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main (int argc, char **argv)
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int result = STATE_OK;
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char input_buffer[MAX_INPUT_BUFFER];
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char error_message[MAX_INPUT_BUFFER];
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time_t timestamp = 0L;
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unsigned long average_value_rate = 0L;
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unsigned long maximum_value_rate = 0L;
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unsigned long value_rate = 0L;
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if (process_arguments (argc, argv) != OK)
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usage ("Invalid command arguments supplied\n");
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/* open the MRTG log file for reading */
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fp = fopen (log_file, "r");
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printf ("Unable to open MRTG log file\n");
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return STATE_UNKNOWN;
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while (fgets (input_buffer, MAX_INPUT_BUFFER - 1, fp)) {
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/* skip the first line of the log file */
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/* break out of read loop if we've passed the number of entries we want to read */
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/* grab the timestamp */
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temp_buffer = strtok (input_buffer, " ");
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timestamp = strtoul (temp_buffer, NULL, 10);
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/* grab the average value 1 rate */
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temp_buffer = strtok (NULL, " ");
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if (variable_number == 1)
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average_value_rate = strtoul (temp_buffer, NULL, 10);
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/* grab the average value 2 rate */
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temp_buffer = strtok (NULL, " ");
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if (variable_number == 2)
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average_value_rate = strtoul (temp_buffer, NULL, 10);
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/* grab the maximum value 1 rate */
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temp_buffer = strtok (NULL, " ");
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if (variable_number == 1)
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maximum_value_rate = strtoul (temp_buffer, NULL, 10);
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/* grab the maximum value 2 rate */
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temp_buffer = strtok (NULL, " ");
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if (variable_number == 2)
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maximum_value_rate = strtoul (temp_buffer, NULL, 10);
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/* close the log file */
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/* if we couldn't read enough data, return an unknown error */
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result = STATE_UNKNOWN;
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sprintf (error_message, "Unable to process MRTG log file\n");
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/* make sure the MRTG data isn't too old */
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if (result == STATE_OK) {
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time (¤t_time);
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if (expire_minutes > 0
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&& (current_time - timestamp) > (expire_minutes * 60)) {
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result = STATE_WARNING;
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sprintf (error_message, "MRTG data has expired (%d minutes old)\n",
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(int) ((current_time - timestamp) / 60));
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/* else check the incoming/outgoing rates */
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if (result == STATE_OK) {
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if (use_average == TRUE)
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value_rate = average_value_rate;
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value_rate = maximum_value_rate;
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if (value_rate > value_critical_threshold)
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result = STATE_CRITICAL;
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else if (value_rate > value_warning_threshold)
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result = STATE_WARNING;
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sprintf (error_message, "%s. %s = %lu %s",
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(use_average == TRUE) ? "Ave" : "Max", value_label, value_rate,
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printf ("%s\n", error_message);
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/* process command-line arguments */
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process_arguments (int argc, char **argv)
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int option_index = 0;
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static struct option long_options[] = {
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{"logfile", required_argument, 0, 'F'},
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{"expires", required_argument, 0, 'e'},
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{"aggregation", required_argument, 0, 'a'},
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{"variable", required_argument, 0, 'v'},
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{"critical", required_argument, 0, 'c'},
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{"warning", required_argument, 0, 'w'},
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{"label", required_argument, 0, 'l'},
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{"units", required_argument, 0, 'u'},
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{"verbose", no_argument, 0, 'v'},
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{"version", no_argument, 0, 'V'},
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{"help", no_argument, 0, 'h'},
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for (c = 1; c < argc; c++) {
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if (strcmp ("-to", argv[c]) == 0)
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strcpy (argv[c], "-t");
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else if (strcmp ("-wt", argv[c]) == 0)
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strcpy (argv[c], "-w");
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else if (strcmp ("-ct", argv[c]) == 0)
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strcpy (argv[c], "-c");
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getopt_long (argc, argv, "hVF:e:a:v:c:w:l:u:", long_options,
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c = getopt (argc, argv, "hVF:e:a:v:c:w:l:u:");
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if (c == -1 || c == EOF)
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case 'F': /* input file */
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case 'e': /* ups name */
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expire_minutes = atoi (optarg);
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if (!strcmp (optarg, "MAX"))
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variable_number = atoi (optarg);
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if (variable_number < 1 || variable_number > 2)
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usage ("Invalid variable number\n");
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case 'w': /* critical time threshold */
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value_warning_threshold = strtoul (optarg, NULL, 10);
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case 'c': /* warning time threshold */
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value_critical_threshold = strtoul (optarg, NULL, 10);
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case 'l': /* label */
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value_label = optarg;
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case 'u': /* timeout */
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units_label = optarg;
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case 'V': /* version */
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print_revision (progname, REVISION);
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usage ("Invalid argument\n");
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if (log_file == NULL && argc > c) {
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log_file = argv[c++];
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if (expire_minutes <= 0 && argc > c) {
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if (is_intpos (argv[c]))
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expire_minutes = atoi (argv[c++]);
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terminate (STATE_UNKNOWN,
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"%s is not a valid expiration time\nUse '%s -h' for additional help\n",
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if (argc > c && strcmp (argv[c], "MAX") == 0) {
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else if (argc > c && strcmp (argv[c], "AVG") == 0) {
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if (argc > c && variable_number == -1) {
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variable_number = atoi (argv[c++]);
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if (variable_number < 1 || variable_number > 2) {
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printf ("%s :", argv[c]);
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usage ("Invalid variable number\n");
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if (argc > c && value_warning_threshold == 0) {
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value_warning_threshold = strtoul (argv[c++], NULL, 10);
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if (argc > c && value_critical_threshold == 0) {
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value_critical_threshold = strtoul (argv[c++], NULL, 10);
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if (argc > c && strlen (value_label) == 0) {
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value_label = argv[c++];
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if (argc > c && strlen (units_label) == 0) {
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units_label = argv[c++];
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return validate_arguments ();
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validate_arguments (void)
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if (variable_number == -1)
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usage ("You must supply the variable number\n");
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print_revision (progname, REVISION);
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printf ("%s\n\n%s\n", COPYRIGHT, SUMMARY);
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printf ("\nOptions:\n" LONGOPTIONS "\n" DESCRIPTION "\n");
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printf ("Usage:\n" " %s %s\n"
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" %s (-h | --help) for detailed help\n"
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" %s (-V | --version) for version information\n",
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" %s -h for detailed help\n"
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" %s -V for version information\n",
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progname, OPTIONS, progname, progname);
added
removed
plugins/check_mrtg.c
