check_domain_expiration.sh

#!/bin/bash

#############################################
#
# This plugin checks domain expiration date
#
# Author: Emil Wypych
#
# Contact: wypychemil at gmail.com
#
# GitHub: https://github.com/ewypych/icinga-domain-expiration-plugin
#
#############################################

# default days for warning (can change with -w cmd)
WARNING=30

# default days for critical (can change with -c cmd)
ALARM=10

# binaries path
WHOIS="/usr/bin/whois"
AWK="/usr/bin/awk"

# Main check function
check_domain()
{
	# Set domain
	DOMAIN=$1

	# check root domain
	DTYPE=$( echo $DOMAIN | awk -F "." '{print $NF}' )

	if [ "$DTYPE" == "com" ]
	then
		# "=${1}" because of many possibilities - check out google.com with "whois google.com"
		EXDATE_TMP=$(${WHOIS} -h whois.internic.com "=${1}" | ${AWK} '/Registry Expiry Date:/ { print $4 }' | cut -c 1-16)
		if [ -z "$EXDATE_TMP" ]
		then
			EXP_DAYS=NULL
		else
			EXDATE=`date -d"$EXDATE_TMP" +%Y-%m-%d`
			EXP_DAYS=$(( ( $(date -ud ${EXDATE} +'%s') - $(date -ud `date +%Y-%m-%d` +'%s') )/60/60/24 ))
		fi
	elif [ "$DTYPE" == "se" ] || [ "$DTYPE" == "nu"  ]
	then
		EXDATE_TMP=$(${WHOIS} "${1}" | ${AWK} '/expires:/ { print $2 }')
		if [ -z "$EXDATE_TMP" ]
		then
			EXP_DAYS=NULL
		else
			EXDATE=`date -d"$EXDATE_TMP" +%Y-%m-%d`
			EXP_DAYS=$(( ( $(date -ud ${EXDATE} +'%s') - $(date -ud `date +%Y-%m-%d` +'%s') )/60/60/24 ))
		fi
	elif [ "$DTYPE" == "ua" ]
	then
		EXDATE_TMP=$(${WHOIS} -h whois.ua "${1}" | ${AWK} '/expires:/ { print $2 }')
		if [ -z "$EXDATE_TMP" ]
		then
			EXP_DAYS=NULL
		else
			EXDATE=`date -d"$EXDATE_TMP" +%Y-%m-%d`
			EXP_DAYS=$(( ( $(date -ud ${EXDATE} +'%s') - $(date -ud `date +%Y-%m-%d` +'%s') )/60/60/24 ))
		fi
	elif [ "$DTYPE" == "asia" ]
	then
		EXDATE_TMP=$(${WHOIS} "${1}" | ${AWK} '/Registry Expiry Date:/ { print $4 }' | cut -c 1-16)
		if [ -z "$EXDATE_TMP" ]
		then
			EXP_DAYS=NULL
		else
			EXDATE=`date -d"$EXDATE_TMP" +%Y-%m-%d`
			EXP_DAYS=$(( ( $(date -ud ${EXDATE} +'%s') - $(date -ud `date +%Y-%m-%d` +'%s') )/60/60/24 ))
		fi
	elif [ "$DTYPE" == "org" ]
	then
		EXDATE_TMP=$(${WHOIS} -h whois.pir.org "${1}" | ${AWK} '/Expiry Date:/ { print $4 }' | cut -c 1-16)
		if [ -z "$EXDATE_TMP" ]
		then
			EXP_DAYS=NULL
		else
			EXDATE=`date -d"$EXDATE_TMP" +%Y-%m-%d`
			EXP_DAYS=$(( ( $(date -ud ${EXDATE} +'%s') - $(date -ud `date +%Y-%m-%d` +'%s') )/60/60/24 ))
		fi
	elif [ "$DTYPE" == "info" ]
	then
		EXDATE_TMP=$(${WHOIS} -h whois.afilias.info "${1}" | ${AWK} '/Expiry Date:/ { print $4 }' | cut -c 1-16)
		if [ -z "$EXDATE_TMP" ]
		then
			EXP_DAYS=NULL
		else
			EXDATE=`date -d"$EXDATE_TMP" +%Y-%m-%d`
			EXP_DAYS=$(( ( $(date -ud ${EXDATE} +'%s') - $(date -ud `date +%Y-%m-%d` +'%s') )/60/60/24 ))
		fi
	elif [ "$DTYPE" == "net" ]
	then
		EXDATE_TMP=$(${WHOIS} -h whois.verisign-grs.com "${1}" | ${AWK} '/Registry Expiry Date:/ { print $4 }' | cut -c 1-16)
		if [ -z "$EXDATE_TMP" ]
		then
			EXP_DAYS=NULL
		else
			EXDATE=`date -d"$EXDATE_TMP" +%Y-%m-%d`
			EXP_DAYS=$(( ( $(date -ud ${EXDATE} +'%s') - $(date -ud `date +%Y-%m-%d` +'%s') )/60/60/24 ))
		fi
	elif [ "$DTYPE" == "center" ]
	then
		EXDATE_TMP=$(${WHOIS} "${1}" | ${AWK} '/Registry Expiry Date:/ { print $4 }' | cut -c 1-16)
		if [ -z "$EXDATE_TMP" ]
		then
			EXP_DAYS=NULL
		else
			EXDATE=`date -d"$EXDATE_TMP" +%Y-%m-%d`
			EXP_DAYS=$(( ( $(date -ud ${EXDATE} +'%s') - $(date -ud `date +%Y-%m-%d` +'%s') )/60/60/24 ))
		fi
	elif [ "$DTYPE" == "pro" ]
	then
		EXDATE_TMP=$(${WHOIS} "${1}" | ${AWK} '/Registry Expiry Date:/ { print $4 }' | cut -c 1-16)
		if [ -z "$EXDATE_TMP" ]
		then
			EXP_DAYS=NULL
		else
			EXDATE=`date -d"$EXDATE_TMP" +%Y-%m-%d`
			EXP_DAYS=$(( ( $(date -ud ${EXDATE} +'%s') - $(date -ud `date +%Y-%m-%d` +'%s') )/60/60/24 ))
		fi
	elif [ "$DTYPE" == "me" ]
	then
		EXDATE_TMP=$(${WHOIS} -h whois.nic.me "${1}" | ${AWK} '/Registry Expiry Date:/ { print $4 }' | cut -c 1-16)
		if [ -z "$EXDATE_TMP" ]
		then
			EXP_DAYS=NULL
		else
			EXDATE=`date -d"$EXDATE_TMP" +%Y-%m-%d`
			EXP_DAYS=$(( ( $(date -ud ${EXDATE} +'%s') - $(date -ud `date +%Y-%m-%d` +'%s') )/60/60/24 ))
		fi
	elif [ "$DTYPE" == "su" ]
	then
		EXDATE=$(${WHOIS} "${1}" | ${AWK} '/paid-till:/ { print $2 }' | cut -d 'T' -f1)
		if [ -z "$EXDATE" ]
		then
			EXP_DAYS=NULL
		else
			EXP_DAYS=$(( ( $(date -ud ${EXDATE} +'%s') - $(date -ud `date +%Y-%m-%d` +'%s') )/60/60/24 ))
		fi
	elif [ "$DTYPE" == "xn--p1ai" ]
	then
		EXDATE=$(${WHOIS} "${1}" | ${AWK} '/paid-till:/ { print $2 }' | cut -d 'T' -f1)
		if [ -z "$EXDATE" ]
		then
			EXP_DAYS=NULL
		else
			EXP_DAYS=$(( ( $(date -ud ${EXDATE} +'%s') - $(date -ud `date +%Y-%m-%d` +'%s') )/60/60/24 ))
		fi
	elif [ "$DTYPE" == "ru" ]
	then
		EXDATE=$(${WHOIS} "${1}" | ${AWK} '/paid-till:/ { print $2 }' | cut -d 'T' -f1)
		if [ -z "$EXDATE" ]
		then
			EXP_DAYS=NULL
		else
			EXP_DAYS=$(( ( $(date -ud ${EXDATE} +'%s') - $(date -ud `date +%Y-%m-%d` +'%s') )/60/60/24 ))
		fi
	elif [ "$DTYPE" == "moscow" ]
	then
		EXDATE_TMP=$(${WHOIS} "${1}" | ${AWK} '/Registry Expiry Date:/ { print $4 }' | cut -c 1-16)
		if [ -z "$EXDATE_TMP" ]
		then
			EXP_DAYS=NULL
		else
			EXDATE=`date -d"$EXDATE_TMP" +%Y-%m-%d`
			EXP_DAYS=$(( ( $(date -ud ${EXDATE} +'%s') - $(date -ud `date +%Y-%m-%d` +'%s') )/60/60/24 ))
		fi
	elif [ "$DTYPE" == "art" ]
	then
		EXDATE=$(${WHOIS} -h whois.nic.art "${1}" | ${AWK} '/Registry Expiry Date:/ { gsub("[:.]","-"); print $4 }' | cut -d 'T' -f1)
		if [ -z "$EXDATE" ]
		then
			EXP_DAYS=NULL
		else
			EXP_DAYS=$(( ( $(date -ud ${EXDATE} +'%s') - $(date -ud `date +%Y-%m-%d` +'%s') )/60/60/24 ))
		fi
	elif [ "$DTYPE" == "pl" ]
	then
		EXDATE=$(${WHOIS} "${1}" | ${AWK} '/renewal date:/ { gsub("[:.]","-"); print $3 }')
		if [ -z "$EXDATE" ]
		then
			EXDATE=$(${WHOIS} -h whois.dns.pl "${1}" | ${AWK} '/expiration date:/ { gsub("[:.]","-"); print $3 }')
			if [ -z "$EXDATE" ]
			then
				EXP_DAYS=NULL
			else
				EXP_DAYS=$(( ( $(date -ud ${EXDATE} +'%s') - $(date -ud `date +%Y-%m-%d` +'%s') )/60/60/24 ))
			fi
		else
			EXP_DAYS=$(( ( $(date -ud ${EXDATE} +'%s') - $(date -ud `date +%Y-%m-%d` +'%s') )/60/60/24 ))
		fi
	elif [ "$DTYPE" == "cz" ]
	then
		EXDATE=$(${WHOIS} -h whois.nic.cz "${1}" | ${AWK} '/expire:/ { gsub("[.]","/",$2); print $2 }')
		if [ -z "$EXDATE" ]
		then
			EXP_DAYS=NULL
		else
			EXP_DAYS=$(( ( $(date -ud ${EXDATE} +'%s') - $(date -ud `date +%Y-%m-%d` +'%s') )/60/60/24 ))
		fi
	elif [ "$DTYPE" == "fr" -o "$DTYPE" == "re" -o "$DTYPE" == "yt" -o "$DTYPE" == "tf" -o "$DTYPE" == "wf" -o "$DTYPE" == "pm" ]
	then
		EXDATE=$(${WHOIS} -h whois.afnic.fr "${1}" | ${AWK} '/Expiry Date:/ { gsub("[:.]","-"); print $3 }' | cut -d 'T' -f1)
		if [ -z "$EXDATE" ]
		then
			EXP_DAYS=NULL
		else
			EXP_DAYS=$(( ( $(date -ud ${EXDATE} +'%s') - $(date -ud `date +%Y-%m-%d` +'%s') )/60/60/24 ))
		fi
	elif [ "$DTYPE" == "shop" ]
	then
		EXDATE=$(${WHOIS} -h whois.nic.shop "${1}" | ${AWK} '/Registry Expiry Date:/ { gsub("[:.]","-"); print $4 }' | cut -d 'T' -f1)
		if [ -z "$EXDATE" ]
		then
			EXP_DAYS=NULL
		else
			EXP_DAYS=$(( ( $(date -ud ${EXDATE} +'%s') - $(date -ud `date +%Y-%m-%d` +'%s') )/60/60/24 ))
		fi
	elif [ "$DTYPE" == "tv" ]
	then
		EXDATE=$(${WHOIS} -h tvwhois.verisign-grs.com "${1}" | ${AWK} '/Registry Expiry Date:/ { gsub("[:.]","-"); print $4 }' | cut -d 'T' -f1)
		if [ -z "$EXDATE" ]
		then
			EXP_DAYS=NULL
		else
			EXP_DAYS=$(( ( $(date -ud ${EXDATE} +'%s') - $(date -ud `date +%Y-%m-%d` +'%s') )/60/60/24 ))
		fi
	elif [ "$DTYPE" == "im" ]
	then
		EXDATE_TMP=$(${WHOIS} -h whois.nic.im "${1}" | ${AWK} '/Expiry Date:/ { gsub("[:.]","-"); print $3 }' | cut -d 'T' -f1 | awk -F[/] '{print $2"/"$1"/"$3}') 
		EXDATE=`date -d"$EXDATE_TMP" +%Y-%m-%d`
		EXP_DAYS=$(( ( $(date -ud ${EXDATE} +'%s') - $(date -ud `date +%Y-%m-%d` +'%s') )/60/60/24 ))
        elif [ "$DTYPE" == "coop" ]
        then
                EXDATE_TMP=$(${WHOIS} -h whois.nic.coop "${1}" | ${AWK} '/Expiry Date:/ { print $4 }' | cut -c 1-16)
                EXDATE=`date -d"$EXDATE_TMP" +%Y-%m-%d`
                EXP_DAYS=$(( ( $(date -ud ${EXDATE} +'%s') - $(date -ud `date +%Y-%m-%d` +'%s') )/60/60/24 ))
        elif [ "$DTYPE" == "us" ]
        then
                EXDATE_TMP=$(${WHOIS} -h whois.nic.us "${1}" | ${AWK} '/Expiry Date:/ { print $4 }' | cut -c 1-16)
                EXDATE=`date -d"$EXDATE_TMP" +%Y-%m-%d`
                EXP_DAYS=$(( ( $(date -ud ${EXDATE} +'%s') - $(date -ud `date +%Y-%m-%d` +'%s') )/60/60/24 ))
	else
		echo "UNKNOWN - "$DTYPE" unsupported"
		exit 3
	fi
}

# Help function
help()
{
	echo "Usage: $0 [ -d domain_name ] [ -w ex_days ] [ -c ex_days ] [ -h ]"
	echo
	echo "  -d domain        : Domain to check"
	echo "  -h               : Show help"
	echo "  -w days          : Domain expiration days (warning)"
	echo "  -c days          : Domain expiration days (critical)"
	echo
}

while getopts :hd:w:c: option
do
	case "${option}"
	in
		d) DOMAIN=$( echo ${OPTARG} );;
		w) WARNING=$OPTARG;;
		c) ALARM=$OPTARG;;
		h | *) help
		exit 3;;
	esac
done

# check whether ALARM is greater or equal WARNING
if [ $ALARM -ge $WARNING ]
then
	echo "UNKNOWN - CRITICAL threshold cannot be bigger than WARNING"
	exit 3
fi

check_domain "${DOMAIN}"

# exit codes based on the check_domain result

if ! [[ "$EXP_DAYS" =~ ^-?[0-9]+$ ]]
then
	echo "UNKNOWN - expiration date has not been provided by WHOIS server"
	exit 3
else
	if [ $EXP_DAYS -gt $WARNING  ]
	then
		echo "OK - $EXP_DAYS days until domain expires"
		exit 0
	elif [ $EXP_DAYS -le $WARNING -a $EXP_DAYS -gt $ALARM ]
	then
		echo "WARNING - $EXP_DAYS days until domain expires"
		exit 1
	elif [ $EXP_DAYS -le $ALARM -a $EXP_DAYS -gt 0 ]
	then
		echo "CRITICAL - $EXP_DAYS days until domain expires"
		exit 2
	elif [  $EXP_DAYS -lt 0  ]
	then
		echo "CRITICAL - domain has expired!"
		exit 2
	else
		echo "UNKNOW - $EXP_DAYS"
		exit 3
	fi
fi