#!/bin/sh
# Nagios shoutcast plug-in
# By Juliano Jeziorny (djkadu@gmail.com)
# Rev 0.1 
# 23/11/2010

WARN=90					# default Warning threshold if none is specified
ALER=75					# default Alert thresshold if none is specified
CURL=`which curl`			# you can also specify the full path to curl
[[ -z $CURL ]] && exit 3		# if curl is not present exit with unknown error

while getopts ":H:p:w:a:" OPT; do	# check supplied arguments
	case $OPT in
		H	)	HOST=$OPTARG;;
		p	)	PORT=$OPTARG;;
		w	)	WARN=$OPTARG;;
		a	)	ALER=$OPTARG;;
	esac
done
if [[ -n $HOST && -n $PORT ]]		# test if minimum required arguments are present
	then
		STR=`$CURL http://$HOST:$PORT/7.html -A Mozilla/4.0 -s -m 5`	# access 7.html on the specified host and port
		case $? in
			0	)	;;
			6	)	echo "Invalid Host"; exit 1;;
			7	)	echo "SHOUTCAST ALERT - Failed to connect to host on port $PORT"; exit 2;;
			*	)	echo "SHOUTCAST UNKNOWN - Unknown error"; exit 3;;
		esac
		CUR=`echo $STR |cut -d\> -f5 |cut -d, -f1`			# cut out current listenens
		MAX=`echo $STR |cut -d\> -f5 |cut -d, -f4`			# cut out maximum listeners
		LEVEL="OK" && EXIT=0						# if we got to this point with no error assume level is OK
		[[ "$CUR" -ge "$WARN" ]] && LEVEL="WARNING" && EXIT=1		# check if current listeners is higher than warning theashold
		[[ "$CUR" -ge "$ALER"-1 ]] && LEVEL="ALERT" && EXIT=2		# check if current listeners is higher than alarm threshold
		echo "SHOUTCAST $LEVEL - $CUR out of $MAX listeners on port $PORT"
		exit $EXIT	
fi
echo "Usage:
check_shoutcast -H <ip address> -p <port>
[-w warning level (default 75 listeners)] [-a alert level (default 90 listeners)]"