#!/bin/bash

function usage() {
	[ -n "$1" ] && echo "$1" && echo
	echo "Usage : $0 [-cX] [-wX] [-d] [peer]"
	echo "	-h		Show this help message"
	echo "	-d		Enable debug mode"
	echo "	-c[X]		Specify critical number of simultaneous channels"
	echo "	-w[X]		Specify warning number of simultaneous channels"
	echo "	[peer]		Specify the peer name"
}

function debug() {
	[ $DEBUG -eq 1 ] && echo -e "$( date "+%Y/%m/%d %H:%M:%S" ) - $1"
}

CRITICAL=10
WARNING=8
PEER=""
DEBUG=0

for arg in $@
do
	if [ $( echo $arg|egrep -c '^-[cwdh][0-9]*$' ) -gt 0 ]
	then
		a=$( echo $arg|sed 's/^-\([cwdh]\).*$/\1/' )
		v=$( echo $arg|sed 's/^-[cwdh]//' )
		case $a in
			c)
				CRITICAL=$v
			;;
			w)
				WARNING=$v
			;;
			d)
				DEBUG=1
			;;
			h)
				usage
				exit 0
			;;
		esac
	else
		PEER="$arg"
	fi
done

[ -z "$PEER" ] && usage "You must specify peer name" && exit 1

debug "Parameters : Warning = $WARNING / Critical = $CRITICAL"
[ $WARNING -gt $CRITICAL ] && usage "Warning number of simultaneous channels must be lower than critical one" && exit 1

number=$( /usr/bin/sudo -u root /usr/sbin/rasterisk -rnx "core show channels concise"|cut -d'!' -f1|grep -Ec "^SIP/$PEER-" )
if [ ! -n "$number" ]
then
	echo "UNKNOW - Fail to retreive number of simultaneous channels of SIP peer $PEER"
	exit 3
fi

debug "Peer $PEER simultaneous channels : $number"

if [ $number -gt $CRITICAL ]
then
	st='CRITICAL'
	ec=2
elif [ $number -gt $WARNING ]
then
	st='WARNING'
	ec=1
else
	st=OK
	ec=0
fi
echo  "$st - $number simultaneous channels with SIP peer $PEER|'simultaneous channels':$number;$WARNING;$CRITICAL;0;$"
exit $ec