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#!/bin/bash
noip_user="example@sina.com"
noip_pass="xxxxxxx"
noip_domain='example.ddns.net'

noip_url='https://dynupdate.no-ip.com/nic/update'

ipv6=`ip addr show eth0 | grep "inet6.*global" | awk '{print $2}' | awk -F"/" '{print $1}'`
current_ipv6=`nslookup -query=AAAA $noip_domain 2>&1`
current_ipv6=`echo "$current_ipv6" | grep 'Address: ' | tail -n1 | awk '{print $NF}'`

echo '-----------------' $ipv6
echo '-----------------' $current_ipv6

noip_data="?hostname=$noip_domain&myip=$ipv6"

noip_head=$(echo $noip_user:$noip_pass | base64)

if [ "$ipv6" = "$current_ipv6" ]
then
    echo '-----------------' "Skipping"
else
    curl -H "Authorization: Basic $noip_head" -s "$noip_url$noip_data"
    echo '-----------------' "Updated record $ipv6"
fi