freifunk-ddns

#!/bin/bash
export LC_ALL=C
NSUPDATE=nsupdate
TIMEOUT=300
DDNS_KEYFILE=/etc/bind/keys/Kgw05.freifunk-stuttgart.de.+165+50977.key
DDNS_SERVER=dns1.lihas.de
DDNS_DOMAIN=freifunk-stuttggart.de
DDNS_HOSTBASE=gw05
FFS_SEGEMNTS=4
DOIPV4=1
DOIPV6=1
SEGMENTS=""
GW_INSTANCE=""

OPTS="-k $DDNS_KEYFILE -t $TIMEOUT"
if [ -e /etc/default/freifunk ]; then
	. /etc/default/freifunk
fi

print_help() {
cat <<-EOF >&2
$0 [--check] [--nov4] [--nov6] [--segments=N[,M[,...]]] [--gwnum=NN]
	--help:		This text
	--check:	check our segments
	--delete:	delete the IP from the GW/Segment
	--add:		delete the IP to the GW/Segment
	--nov4:		don't operate on ip v4 (default: v4 and v6)
	--nov6:		don't operate on ip v6 (default: v4 and v6)
	--gwnum:	gwNN instead of $DDNS_HOSTBASE
	--segments:	segements to operate on, default all
EOF
}
TEMP=`getopt -o h --long help,check,add,delete,ipv4:,ipv6:,nov4,nov6,segments:,gwnum: -- "$@"`
if [ $? != 0 ] ; then print_help >&2 ; exit 1 ; fi
eval set -- "$TEMP"
while true ; do
	case "$1" in
		--help)		print_help; exit 1;;
		--check)	ACTION=CHECK; shift 1;;
		--add)		ACTION=ADD; shift 1;;
		--delete)	ACTION=DELETE; shift 1;;
		--ipv4)		GW_V4=$2; shift 2;;
		--ipv6)		GW_V6=$2; shift 2;;
		--nov4)		DOIPV4=0; shift 1;;
		--nov6)		DOIPV6=0; shift 1;;
		--segments)	SEGMENTS=$(sed 's/,/ /g' <<<$2); shift 2;;
		--gwnum)	DDNS_HOSTBASE=$(printf 'gw%02i' $2); shift 2;;
		--gwinstance)	GW_INSTANCE=$(printf '%02i' $2); shift 2;;
		--) shift ; break ;;
		*) echo "Unknown parameter $1, try -h" ; exit 1 ;;
	esac
done

if [ x"$SEGMENTS" == x ]; then
	SEGMENTS="$(for i in $(seq 0 $FFS_SEGEMNTS); do echo $i\ ; done)"
fi
if [ x"$GW_V4" == x ]; then
	DOIPV4=0
fi
if [ x"$GW_V6" == x ]; then
	DOIPV6=0
fi

case $ACTION in
	CHECK)
		for s in $SEGMENTS; do
			seg=$(printf '%02i' $s)
			if [ $s -eq 0 ]; then
				if [ $DOIPV4 -eq 1 ]; then printf '% 8s\t%s\n' ${DDNS_HOSTBASE} $(dig +short ${DDNS_HOSTBASE}.${DDNS_DOMAIN}. -t A | grep -w "$GW_V4"); fi
				if [ $DOIPV6 -eq 1 ]; then printf '% 8s\t%s\n' ${DDNS_HOSTBASE} $(dig +short ${DDNS_HOSTBASE}.${DDNS_DOMAIN}. -t AAAA | grep -w "$GW_V6"); fi
			fi
			if [ $DOIPV4 -eq 1 ]; then printf '% 8s\t%s\n' ${DDNS_HOSTBASE}s$seg $(dig +short ${DDNS_HOSTBASE}s$seg.${DDNS_DOMAIN}. -t A | grep -w "$GW_V4"); fi
			if [ $DOIPV6 -eq 1 ]; then printf '% 8s\t%s\n' ${DDNS_HOSTBASE}s$seg $(dig +short ${DDNS_HOSTBASE}s$seg.${DDNS_DOMAIN}. -t AAAA | grep -w "$GW_V6"); fi
		done;;
	ADD)
		cat <<-EOF | $NSUPDATE $OPTS
			server $DDNS_SERVER
			$(for s in $SEGMENTS; do
				seg=$(printf '%02i' $s)
				if [ $DOIPV4 -eq 1 ]; then
					if [ $s -eq 0 ]; then echo "add ${DDNS_HOSTBASE}.${DDNS_DOMAIN}. 300 IN A $GW_V4"; fi
					echo "add ${DDNS_HOSTBASE}s$seg.${DDNS_DOMAIN}. 300 IN A $GW_V4"
				fi
				if [ $DOIPV6 -eq 1 ]; then
					if [ $s -eq 0 ]; then echo "add ${DDNS_HOSTBASE}.${DDNS_DOMAIN}. 300 IN AAAA $GW_V6"; fi
					echo "add ${DDNS_HOSTBASE}s$seg.${DDNS_DOMAIN}. 300 IN AAAA $GW_V6"
				fi
			done)
			send
		EOF
		;;
	DELETE)
		cat <<-EOF | $NSUPDATE $OPTS
			server $DDNS_SERVER
			$(for s in $SEGMENTS; do
				seg=$(printf '%02i' $s)
				if [ $DOIPV4 -eq 1 ]; then
					if [ $s -eq 0 ]; then echo "delete ${DDNS_HOSTBASE}.${DDNS_DOMAIN}. A $GW_V4"; fi
					echo "delete ${DDNS_HOSTBASE}s$seg.${DDNS_DOMAIN}. A $GW_V4"
				fi
				if [ $DOIPV6 -eq 1 ]; then
					if [ $s -eq 0 ]; then echo "delete ${DDNS_HOSTBASE}.${DDNS_DOMAIN}. AAAA $GW_V6"; fi
					echo "delete ${DDNS_HOSTBASE}s$seg.${DDNS_DOMAIN}. AAAA $GW_V6"
				fi
			done)
			send
		EOF
		;;
	*) echo "Unknown action $1, try -h" ; exit 1 ;;
esac
exit 0