ddns_duckdns.sh

ddns_duckdns.sh

#!/bin/bash

token=''
domain=''
device=''
historyFile="iphistory_duckdns"

[ -e $historyFile ] && old=`cat $historyFile`

if [ -n "$device" ]; then
    device="dev $device"
fi
address=$(ip -6 addr list scope global $device | grep -v " fd" | sed -n 's/.*inet6 \([0-9a-f:]\+\).*/\1/p' | head -n 1)

if [ -z "$address" ]; then
    echo "no IPv6 address found"
    exit 1
fi

if [ "$old" = "$address" ]; then
    echo "IPv6 address unchanged"
    exit
fi

result=$(curl "https://www.duckdns.org/update?domains=${domain}&token=${token}&clear=true")

if [ "${result}" != "OK" ]; then
    echo "clear Error"
    exit 1
fi

result=$(curl "https://www.duckdns.org/update?domains=${domain}&token=${token}&ipv6=${address}")

if [ "$?" != "0" ]; then
    echo "curl Error"
    exit
fi
# echo "$result"
if [ "${result}" == "OK" ]; then
    echo "$address" > ${historyFile}
fi