scripts/bash/ydns6

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1.3 KiB
Bash
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#!/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