scripts/bash/deprecated/ydns6

#!/usr/bin/env bash

# This script deprecates ydns6 which does dualstack and which I won't
# be updating anymore as IPv4 is always behind NAT and thus useless to me.

# 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.

# Basic usage:
# mkdir -p ~/.local/bin
# curl -L https://github.com/Mikaela/scripts/raw/gh-pages/bash/ydns6 > ~/.local/bin/ydns6
# chmod 700 ~/.local/bin/ydns6
## Copy-paste the following to your crontab without the #
# */5 * * * * PATH_TO_HOME_DIRECTORY_HERE/.local/bin/ydns6 >/dev/null 2>&1

# yDNS details
USEREMAIL=""
PASSWORD=""
HOSTNAME=""

# Get IPv6 address
if hash dig 2> /dev/null; then
	WAN_IP6=$(dig +short myip.opendns.com. AAAA @2620:0:ccd::2)
else
	WAN_IP6=$(curl -sL6 https://icanhazip.com/)
fi
if [ -f $HOME/.ydns6.txt ]; then
	OLD_WAN_IP6=$(cat $HOME/.ydns6.txt)
else
	echo "No file, need IP6"
	OLD_WAN_IP6=""
fi

# Update IPv6
if [ "$WAN_IP6" = "$OLD_WAN_IP6" ]; then
	echo "IP6 Unchanged"
else
	echo $WAN_IP6 > $HOME/.ydns6.txt
	echo "Updating DNS to $WAN_IP6"
	curl -6 --basic -u "$USEREMAIL:$PASSWORD" --silent \
		https://ydns.io/api/v1/update/?host=$HOSTNAME\&ip=$WAN_IP6
fi