First commit

CHANGELOG

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+2014-01-03
+Version 0.1 - First release of the plugin
+
+

LICENSE

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+Copyright (C) 2014 Jack-Benny Persson <jack-benny@cyberinfo.se>
+
+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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+

README.md

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+# check\_smhi #
+A Nagios plugin that checks the SMHI (Sveriges Meteorologiska och Hydrologiska 
+Institut) webpage for wheather alerts for a specfic region. If no alerts are
+issued for the specified region or district the plugin exits with a STATE\_OK
+(0) exit code. If a class 1 warning (lowest on the scale) is issued for the
+region the plugin exits with a STATE\_WARNING (1). For class 2 and class 3
+wheater alerts the plugin exits with a STATE\_CRITICAL (2) exit code.
+
+## Usage ##
+```
+-D
+   District to check for wheather alerts.
+   NOTE: Districts must be quoted, such as "Skåne län utom österlen"
+-P
+   Print a list with all the avaliable districts.
+-h
+   Print detailed help screen.
+-V
+   Print version information.
+``` 
+
+Note from above that regions/districts must be quoted as a string!
+
+## Contributions ##
+All contriubtions are welcome! Fork the repository, make your changes, push it
+back up and send me a pull request. Once I've checked out the code and accepted
+it I will add you to the THANKS file and update the CHANGELOG.
+
+## Copyright ##
+This plugin is released under the GNU GPL license, version 2. Note that this
+plugin may fail at any time! So DON'T rely on this plugin to protect life or
+property!
+
+__Note that I am NOT in any way affiliated with SMHI.__ I wrote this plugin on
+my own on and my own spare time.
+This plugin fetches it's data from [SMHI](http://www.smhi.se) so please use the
+plugin with respect for SMHI. For example use a check interval of something like
+30 minutes instead of every single minute.

check_smhi.sh

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+#!/bin/bash
+
+################################################################################
+#                                                                              #
+#  Copyright (C) 2014 Jack-Benny Persson <jack-benny@cyberinfo.se>             #
+#                                                                              #
+#   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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA  #
+#                                                                              #
+################################################################################
+
+# check_smhi
+Version="0.1"
+Author="Jack-Benny Persson (jack-benny@cyberinfo.se)"
+
+# Binaries
+Which="/usr/bin/which"
+# Binaries entered in the list will be avalible to the script as variables with
+# the first letter uppercase
+Binaries=(sed awk egrep printf curl)
+
+# Variables
+District=""
+State_ok=0
+State_warning=1
+State_critical=2
+State_unknown=3
+AvailDistricts=(
+"Skagerack"
+"Vänern"
+"Kattegatt"
+"Bälten"
+"Sydvästra Östersjön"
+"Södra Östersjön"
+"Sydöstra Östersjön"
+"Mellersta Östersjön"
+"Mellersta Östersjön"
+"Norra Östersjön"
+"Rigabukten"
+"Finska viken"
+"Skärgårdshavet"
+"Södra Bottenhavet"
+"Norra Bottenhavet"
+"Norra Kvarken"
+"Bottenviken"
+"Dalarnas län, Dalafjällen"
+"Jämtlands län, Härjedalsfjällen"
+"Jämtlands län, Jämtlandsfjällen"
+"Västerbottens län, södra Lapplandsfjällen"
+"Norrbottens län, norra Lapplandsfjällen"
+"Skåne län utom österlen"
+"Skåne län, österlen"
+"Blekinge län"
+"Hallands län"
+"Kronobergs län, västra delen"
+"Kronobergs län, östra delen"
+"Kalmar län, öland"
+"Gotlands län"
+"Jönköpings län, västra delen utom syd om Vättern"
+"Jönköpings län, östra delen"
+"Kalmar län utom öland"
+"Jönköpings län, syd om Vättern"
+"Västra Götalands län, Sjuhäradsbygden och Göta älv"
+"Västra Götalands län, Bohuslän och Göteborg"
+"Västra Götalands län, inre Dalsland"
+"Västra Götalands län, sydväst Vänern"
+"Västra Götalands län, norra Västergötland"
+"Värmlands län"
+"Södermanlands län"
+"Stockholms län utom Roslagskusten."
+"Västmanlands län"
+"Uppsala län utom Upplandskusten"
+"Stockholms län, Roslagskusten"
+"Uppsala län, Upplandskusten"
+"Dalarnas län utom Dalafjällen"
+"Gävleborgs län kustland"
+"Gävleborgs län inland"
+"Västernorrlands län"
+"Jämtlands län utom fjällen"
+"Västerbottens län kustland"
+"Västerbottens län inland"
+"Norrbottens län kustland"
+"Norrbottens län inland"
+)
+
+### Functions ###
+
+# Print version information
+print_version()
+{
+        $Printf "\n$0 - $Version\n"
+}
+
+# Print help information
+print_help()
+{
+        print_version
+        $Printf "$Author\n"
+        $Printf "check_smhi\n"
+	/bin/cat <<-EOT
+
+	Options:
+	-D
+	   District to check for wheather alerts.
+	   NOTE: Districts must be quoted, such as "Skåne län utom österlen"
+	-P
+	   Print a list with all the avaliable districts.
+	-h
+	   Print detailed help screen.
+	-V
+	   Print version information.
+	EOT
+}
+
+# Create variables with absolute path to binaries and check
+# if we can execute it (binaries will be avaliable in 
+# variables with first character uppercase, such as Grep)
+Count=0
+for i in ${Binaries[@]}; do
+	$Which $i &> /dev/null
+	if [ $? -eq 0 ]; then
+		declare $(echo ${Binaries[$Count]^}=`${Which} $i`)
+		((Count++))
+	else
+		echo "It seems you don't have ${Binaries[$Count]} installed"
+		exit 1
+	fi
+done
+
+# Sanity check (options and arguments)
+if [ $# -eq 0 ]; then
+	echo "$0 requires an option"
+	print_help
+	exit $State_unknown
+
+elif [ $# -ge 1 ]; then
+	echo "$1" | egrep -q "\-."
+	if [ $? -ne 0 ]; then
+		echo "$0 requires an option"
+		print_help
+		exit $State_unknown
+	fi
+fi
+
+# Parse command line options and arguments
+while getopts D:hVP Opt; do
+       	case "$Opt" in
+	D) District="$OPTARG"
+	   ;;
+       	h) print_help
+   	   exit $State_ok
+       	   ;;
+       	V) print_version
+   	   exit $State_ok
+       	   ;;
+	P) Total=${#AvailDistricts[@]} 
+	   Num=0
+	   while [ $Num -lt $Total ]; do
+		echo "${AvailDistricts[$Num]}"
+		((Num++))
+	   done
+	   exit $State_ok
+	   ;;
+       	*) print_help
+       	   exit $State_unknown
+       	   ;;
+       	esac
+done
+
+# Check if the disctrict exists
+Tot=${#AvailDistricts[@]}
+Index=0
+Match=0
+
+while [ $Index -lt $Tot ]; do
+	echo ${AvailDistricts[$Index]} | egrep -x "$District" &> /dev/null
+	if [ $? -eq 0 ]; then
+		Match=1
+		break
+	fi
+	((Index++))
+done
+
+if [ $Match -eq 0 ]; then
+	echo "District $District does not exist"
+	print_help
+fi
+
+
+### Main ###
+
+# Fetch the warning page
+Data=`curl -s http://www.smhi.se/vadret/vadret-i-sverige/Varningar/varning_tabell_n1_sv.htm`
+
+# First we must replace all åäö with their HTML equivalent
+HtmlDist=`echo $District | sed '{
+s/å/\&aring\;/g
+s/Å/\&Aring\;/g
+s/ä/\&auml\;/g
+s/Ä/\&Auml\;/g
+s/ö/\&ouml\;/g
+s/Ö/\&Ouml\;/g
+}'`
+
+# Get the line number for the current district in the HTML-file and add one line to it
+LineNr=`echo "$Data" | sed -n "/$HtmlDist/="`
+((LineNr++))
+
+# Read the warning message (for example kuling, orkan, åska)
+WarnMsg=`echo "$Data" | sed -n "${LineNr}p" | egrep -o "Varning klass [0-3] .*" | \
+sed 's/\(.*\).........../\1/' | \
+awk '{print substr($0, index($0,$4))}'` 
+
+# Get the current warning class (1, 2 and 3)
+Class=`echo "$Data" | sed -n "${LineNr}p" | egrep -o "Varning klass [0-3]" \
+| awk '{ print $3 }'`
+
+# Chech the current warning class issued for the district
+if [ -z $Class ]; then
+	echo "No warnings issued for $District"
+	exit $State_ok
+elif [ $Class -eq 1 ]; then
+	echo "Class ${Class} warning issued for $District: $WarnMsg"
+	exit $State_warning
+elif [ $Class -eq 2 ]; then
+	echo "Class ${Class} warning issued for $District: $WarnMsg"
+	exit $State_critical
+elif [ $Class -eq 3 ]; then
+	echo "Class ${Class} warning issued for $District: $WarnMsg"
+	exit $State_critical
+else
+	echo "Unknown data from SHMI"
+	exit $State_unknown
+fi
+
+# Catch all unknown errors (if we got this far, something went terribly wrong)
+echo "Something went wrong with $0"
+exit $State_unknown