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#!/bin/bash
setupVars=/etc/pihole/setupVars.conf
# official pihole basic-install.sh code here
getIPv4stuff()
{
IPv4dev=$(ip route get 8.8.8.8 | awk '{for(i=1;i<=NF;i++)if($i~/dev/)print $(i+1)}')
IPv4_address=$(ip -o -f inet addr show dev "$IPv4dev" | awk '{print $4}' | awk 'END {print}')
}
# official pihole basic-install.sh code here
testIPv6() {
first="$(cut -f1 -d":" <<< "$1")"
value1=$(((0x$first)/256))
value2=$(((0x$first)%256))
((($value1&254)==252)) && echo "ULA" || true
((($value1&112)==32)) && echo "GUA" || true
((($value1==254) && (($value2&192)==128))) && echo "Link-local" || true
}
# official pihole basic-install.sh code here
getIPv6stuff()
{
if [ -e /proc/net/if_inet6 ]; then
IPV6_ADDRESSES=($(ip -6 address | grep 'scope global' | awk '{print $2}'))
# Determine type of found IPv6 addresses
for i in "${IPV6_ADDRESSES[@]}"; do
result=$(testIPv6 "$i")
[[ "${result}" == "ULA" ]] && ULA_ADDRESS="${i%/*}"
[[ "${result}" == "GUA" ]] && GUA_ADDRESS="${i%/*}"
done
# Determine which address to be used: Prefer ULA over GUA or don't use any if none found
if [[ ! -z "${ULA_ADDRESS}" ]]; then
IPV6_ADDRESS="${ULA_ADDRESS}"
elif [[ ! -z "${GUA_ADDRESS}" ]]; then
IPV6_ADDRESS="${GUA_ADDRESS}"
else
IPV6_ADDRESS=""
fi
fi
}
# from official pihole basic-install.sh, almost
finalExports() {
#If it already exists, lets overwrite it with the new values.
if [[ -f ${setupVars} ]];then
rm ${setupVars}
fi
{
echo "PIHOLE_INTERFACE=${IPv4dev}"
echo "IPV4_ADDRESS=${IPv4_address}"
echo "IPV6_ADDRESS=${IPv6_address}"
}>> "${setupVars}"
}
getIPv4stuff
getIPv6stuff
finalExports
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