scripts/bash/ydns-simple

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#!/usr/bin/env bash
# This script is based on cf-ddns.sh found at
# <https://gist.github.com/larrybolt/6295160> and it's comments.
# Inspiration also took from
# <https://github.com/commx/ydns/blob/master/updater.sh> which is a lot
# more complex than this.
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# yDNS details
USEREMAIL=""
PASSWORD=""
HOSTNAME=""
# Get IPv4 address
WAN_IP4=$(dig +short myip.opendns.com @resolver1.opendns.com)
if [ -f $HOME/.wan_ip4-ydns.txt ]; then
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OLD_WAN_IP4=$(cat $HOME/.wan_ip4-ydns.txt)
else
echo "No file, need IP4"
OLD_WAN_IP4=""
fi
# Get IPv6 address
WAN_IP6=$(dig +short myip.opendns.com AAAA @2620:0:ccc::2)
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if [ -f $HOME/.wan_ip6-ydns.txt ]; then
OLD_WAN_IP6=$(cat $HOME/.wan_ip6-ydns.txt)
else
echo "No file, need IP6"
OLD_WAN_IP6=""
fi
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# Update IPv4
if [ "$WAN_IP4" = "$OLD_WAN_IP4" ]; then
echo "IP4 Unchanged"
else
echo $WAN_IP4 > $HOME/.wan_ip4-ydns.txt
echo "Updating DNS to $WAN_IP4"
curl -4 --basic -u "$USEREMAIL:$PASSWORD" --silent \
https://ydns.eu/api/v1/update/?host=$HOSTNAME
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fi
# Update IPv6
if [ "$WAN_IP6" = "$OLD_WAN_IP6" ]; then
echo "IP6 Unchanged"
else
echo $WAN_IP6 > $HOME/.wan_ip6-ydns.txt
echo "Updating DNS to $WAN_IP6"
curl -6 --basic -u "$USEREMAIL:$PASSWORD" --silent \
https://ydns.eu/api/v1/update/?host=$HOSTNAME
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fi