#!/bin/ash

IP_TEMPFILE=/tmp/wanip
NJALLA_SUBDOMAIN="thing.com"
NJALLA_KEY="1234"


# Gets the current WAN interface and IP(s)
. /lib/functions/network.sh
network_flush_cache
network_find_wan NET_IF
network_find_wan6 NET_IF6
network_get_ipaddr NET_ADDR "${NET_IF}"
network_get_ipaddr6 NET_ADDR6 "${NET_IF6}"

if [ "$1" = "--query" ] || [ ! -f ${IP_TEMPFILE} ]; then
    echo "Querying IP from DNS server"
    NET_ADDR_OLD="$(nslookup -type=a ${NJALLA_SUBDOMAIN} | awk '/^Address: / { print $2 }')"
    NET_ADDR6_OLD="$(nslookup -type=aaaa ${NJALLA_SUBDOMAIN} | awk '/^Address: / { print $2 }')"

    if [ ! -f ${IP_TEMPFILE} ]; then
        touch ${IP_TEMPFILE} || exit 1
        echo "NET_ADDR_OLD=${NET_ADDR_OLD}" > $IP_TEMPFILE
        echo "NET_ADDR6_OLD=${NET_ADDR6_OLD}" >> $IP_TEMPFILE
    fi
else
    . ${IP_TEMPFILE}
fi

if [ "$NET_ADDR" != "$NET_ADDR_OLD" ] || [ "$NET_ADDR6" != "$NET_ADDR6_OLD" ] || [ "$1" = "--force" ]; then
    echo "IPv4: ${NET_ADDR_OLD} => ${NET_ADDR}"
    echo "IPv6: ${NET_ADDR6_OLD} => ${NET_ADDR6}"

    wget -q -O /dev/null "https://njal.la/update/?h=${NJALLA_SUBDOMAIN}&k=${NJALLA_KEY}&a=${NET_ADDR}&aaaa=${NET_ADDR6}"
    STATUS=$?
    if [ $STATUS -ne 0 ]; then
        echo "Could not set DDNS IP! (${STATUS})"
    fi

    echo "NET_ADDR_OLD=${NET_ADDR}" > $IP_TEMPFILE
    echo "NET_ADDR6_OLD=${NET_ADDR6}" >> $IP_TEMPFILE
fi