#!/bin/sh

_nhrp_config="/etc/opennhrp/opennhrp.conf"
_nhrp_ipsec="/etc/opennhrp/opennhrp.ipsec"
_strongswan_pid="/var/run/charon.pid"
_type="hub"
_script_name="opennhrp"

if ! grep "$NHRP_INTERFACE" $_nhrp_config | grep "hub"> /dev/null 2>&1; then
	_type="spoke"
fi

case $1 in
interface-up)
	logger -t ${_script_name} -p local7.notice "Flush route table proto 42 and neighbours on interface $NHRP_INTERFACE"
	ip route flush proto 42 dev $NHRP_INTERFACE
	ip neigh flush dev $NHRP_INTERFACE
	;;
peer-register)
	logger -t ${_script_name} -p local7.notice "Received peer registration request: $NHRP_SRCNBMA $NHRP_DESTNBMA"
	;;
peer-up)
	if [ -n "$NHRP_DESTMTU" ]; then
		ARGS=`ip route get $NHRP_DESTNBMA from $NHRP_SRCNBMA | head -1`
		ip route add $ARGS proto 42 mtu $NHRP_DESTMTU
		logger -t ${_script_name} -p local7.notice "ip route add $ARGS proto 42 mtu $NHRP_DESTMTU"
	fi
	logger -t ${_script_name} -p local7.notice "Create link from $NHRP_SRCADDR ($NHRP_SRCNBMA) to $NHRP_DESTADDR ($NHRP_DESTNBMA)"
	if [[ ( ${_type} == "spoke" ) && ( -e ${_strongswan_pid} ) ]]; then
		if grep "${NHRP_SRCADDR}" "${_nhrp_ipsec}"; then
			if swanctl -l -r | grep -q "^list-sa event {dmvpn-DMVPN-.* state=ESTABLISHED local-host=$NHRP_SRCNBMA.*remote-host=$NHRP_DESTNBMA"; then
				logger -t ${_script_name} -p local7.notice "IPSec: connection to $NHRP_DESTADDR ($NHRP_DESTNBMA) already exists"
			else
				logger -t ${_script_name} -p local7.notice "IPSec: connect to $NHRP_DESTADDR ($NHRP_DESTNBMA)"
				swanctl -i -c dmvpn -S $NHRP_SRCNBMA -R $NHRP_DESTNBMA || exit 1
			fi			
		fi
	fi
	;;
peer-down)
	logger -t ${_script_name} -p local7.notice "Delete link from $NHRP_SRCADDR ($NHRP_SRCNBMA) to $NHRP_DESTADDR ($NHRP_DESTNBMA)"
	if [[ ( ${_type} == "spoke" ) && ( -e ${_strongswan_pid} ) ]]; then
		swanctl -t -S $NHRP_SRCNBMA -R $NHRP_DESTNBMA || exit 1
	fi
	ip route del $NHRP_DESTNBMA src $NHRP_SRCNBMA proto 42
	;;
route-up)
	logger -t ${_script_name} -p local7.notice "Route $NHRP_DESTADDR/$NHRP_DESTPREFIX is up"
	ip route replace $NHRP_DESTADDR/$NHRP_DESTPREFIX proto 42 via $NHRP_NEXTHOP dev $NHRP_INTERFACE
	ip route flush cache
	;;
route-down)
	logger -t ${_script_name} -p local7.notice "Route $NHRP_DESTADDR/$NHRP_DESTPREFIX is down"
	ip route del $NHRP_DESTADDR/$NHRP_DESTPREFIX proto 42
	ip route flush cache
	;;
esac

exit 0