check-network-id

#!/bin/bash
# find unused network ids
	
NETWORK_ID_START="192.168.0.0"
NETWORK_ID_END="192.168.254.0"
NETWORK="192.168"
NETMASK="0/24"
START_NUMBER=0
END_NUMBER=254

find_unused_networks(){

	NET_EXIST=""
	
	INCREMENT_NUMBER=$START_NUMBER
	NETWORK_ID="$NETWORK.$INCREMENT_NUMBER.$NETMASK"
	GATEWAY="$NETWORK.$INCREMENT_NUMBER.1"
	NETWORK_LIST=()
	
	# increment end number
	let END_NUMBER+=1

	# set network id list	
	NETWORK_ID_LIST=($(neutron subnet-list | grep $NETWORK | awk '{print $6}' | sort))
	ARRAY_SIZE=${#NETWORK_ID_LIST[@]}
	let "ARRAY_SIZE-=1"
	LAST_NETWORK_ID=${NETWORK_ID_LIST[ARRAY_SIZE]}
	
	# check id_start
	while [[ $INCREMENT_NUMBER -ne $END_NUMBER ]]; do
		
		echo -n '['
            	echo -n ' '
		
		NETWORK_ID="$NETWORK.$INCREMENT_NUMBER.0/24"
		GATEWAY="$NETWORK.$INCREMENT_NUMBER.1"
	
		neutron subnet-list | grep "$NETWORK_ID" > /dev/null
		if [[ $? -eq 0 ]]; then
	
			# network id exits
			NET_EXIST="YES"
	
		elif [[ $? -eq 1 ]]; then
			
			# network not found
			NET_EXIST="NO"
			NETWORK_LIST+=($NETWORK_ID)
		fi
		
		# incrementing network to: $INCREMENT_NUMBER
		let INCREMENT_NUMBER=$INCREMENT_NUMBER+1

		# print progress
            	echo -n '=>'
            	echo -n ' '
            	echo -n "] $NETWORK_ID" $'\r'		
		
	done
	
	echo "+------+ DONE +-------+"	
	echo ${NETWORK_LIST[@]}
	
	if [[ $NET_EXIST == "NO" ]]; then
	
		for my_net in ${NETWORK_LIST[@]}; do
			neutron subnet-list | grep "$my_net" > /dev/null
			if [[ $? -eq 1 ]]; then

				echo ' '
				echo "creating network: $my_net"	
				NEW_NETWORK_2_CREATE=$my_net

				break
			fi
		done
	fi

}

find_unused_networks