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README
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README
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check_md5
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A Nagios plugin written in Bash to check the MD5 sum of a single file.
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In case the files MD5 change the plugin issues a critical state. This behavior
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can be changed by using a --warning argument, so that only a warning state is
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issued.
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Options:
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-h
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Print detailed help screen
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-V
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Print version information
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--warning
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Issue a warning state instead of a critical state in case of a MD5 failure
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Default is critical
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--file /path/to/file
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Set which file to monitor
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--md5 md5checksum
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Set the MD5 checksum for the file set by --file
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172
check_md5.sh
Executable file
172
check_md5.sh
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#!/bin/bash
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################################################################################
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# #
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# Copyright (C) 2012 Jack-Benny Persson <jack-benny@cyberinfo.se> #
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# #
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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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# #
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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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# #
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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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA #
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# #
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################################################################################
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###############################################################################
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# #
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# Nagios plugin to monitor a single files MD5 sum. In case of mismatch #
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# the plugin exit with a CRICITAL error code. This behavior can be changed #
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# with the --warning argument. #
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# Written in Bash (and uses sed & awk). #
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# #
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###############################################################################
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VERSION="1.0"
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AUTHOR="(c) 2012 Jack-Benny Persson (jack-benny@cyberinfo.se)"
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# Exit codes
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STATE_OK=0
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STATE_WARNING=1
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STATE_CRITICAL=2
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STATE_UNKNOWN=3
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shopt -s extglob
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#### Functions ####
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# Print version information
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print_version()
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{
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printf "\n\n$0 - $VERSION\n"
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}
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#Print help information
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print_help()
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{
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print_version
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printf "$AUTHOR\n"
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printf "Monitor the MD5 checksum of a single file\n"
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/bin/cat <<EOT
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Options:
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-h
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Print detailed help screen
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-V
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Print version information
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--warning
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Issue a warning state instead of a critical state in case of a MD5 failure
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Default is critical
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--file /path/to/file
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Set which file to monitor
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--md5 md5checksum
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Set the MD5 checksum for the file set by --file
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EOT
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}
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# Parse command line options
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while [[ -n "$1" ]]; do
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case "$1" in
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-h | --help)
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print_help
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exit $STATE_OK
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;;
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-V | --version)
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print_version
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exit $STATE_OK
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;;
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-?)
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print_help
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exit $STATE_OK
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;;
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--warning)
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warning="yes"
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shift 1
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;;
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--file)
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if [[ -z "$2" ]]; then
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printf "\nOption $1 requires an argument\n"
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print_help
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exit $STATE_UNKNOWN
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fi
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file=$2
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shift 2
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;;
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--md5)
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if [[ -z "$2" ]]; then
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printf "\nOption $1 requires an argument\n"
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print_help
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exit $STATE_UNKNOWN
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fi
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md5=$2
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shift 2
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;;
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*)
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printf "\nInvalid option $1"
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print_help
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exit $STATE_UNKNOWN
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;;
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esac
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done
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### Check if we provided a file and a MD5 sum ###
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if [[ -z "$file" ]]; then
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# No file specified
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printf "\nNo file specified"
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print_help
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exit $STATE_UNKNOWN
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fi
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if [[ -z "$md5" ]]; then
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# No MD5 sum specified
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printf "\nNo MD5 sum specified"
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print_help
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exit $STATE_UNKNOWN
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fi
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### MAIN ###
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#Get the current checksum of the file
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filesum=`md5sum ${file} | awk '{print $1}'`
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#Compare the MD5 on the file against the sum we provided
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if [[ "$filesum" == "$md5" ]]; then
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printf "$file - MD5 OK\n"
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exit $STATE_OK
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#See if we wanted a warning instead of a critical
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elif [[ "$warning" == "yes" ]]; then
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printf "$file - MD5 WARNING\n"
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exit $STATE_WARNING
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#Critical
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else
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printf "$file - MD5 CRITICAL\n"
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exit $STATE_CRITICAL
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fi
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exit 3
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