Created
March 24, 2019 15:21
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Script that creates an IPv4-to-IPv6 bridge
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#!/usr/bin/env bash | |
# This script determines the IPv6 address of a given domain. The so found | |
# address is then used to create an IPv4-to-IPv6 tunnel from this device to the | |
# IPv6 address. | |
# [6tunnel](https://packages.debian.org/de/sid/6tunnel) is used to create the | |
# proxy. | |
# | |
# Usage: ./ipv6-mapper.sh <DOMAIN> <HOST_PORT=443> <TARGET_PORT=443> | |
set -e | |
DOMAIN=${1} # e.g. mysub.mydomain.com, must have a valid AAAA record | |
HOST_PORT=${2:-443} | |
TARGET_PORT=${3:-443} | |
if ! [ -x "$(command -v 6tunnel)" ]; then | |
>&2 echo "Fatal error: 6tunnel is not installed. Abort." | |
exit 1 | |
fi | |
# Request current ipv6 address | |
IPv6=`dig +short "${DOMAIN}" AAAA` | |
if [ -z "$IPv6" ]; then | |
>&2 echo "Fatal error: IPv6 DNS entry not available. Abort." | |
exit 1 | |
fi | |
echo "---------- [ start ipv4-to-ipv6-bridge ] ----------" | |
echo `date` | |
echo "Found IPv6 address: ${IPv6}" | |
proc_count=`ps -aux | grep "6tunnel ${HOST_PORT} ${IPv6}" | wc -l` | |
if [ proc_count = "0" ]; then | |
# Kill all existing tunnel processes | |
echo "Removing already established tunnel connections on this port" | |
kill -9 `ps -aux | grep "6tunnel ${HOST_PORT}" | awk '{ print $2 }'` | |
# Establish connection to new ip | |
echo "Establish new tunnel connection" | |
6tunnel ${HOST_PORT} ${IPv6} ${TARGET_PORT} | |
echo "6tunnel connection has been updated. Finish." | |
else | |
echo "6tunnel connection up to date. No need to update connection. Finish." | |
fi | |
echo "---------- [ end ipv4-to-ipv6-bridge ] ----------" |
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