#!/bin/bash


set -eEuxo pipefail


if (( ${#} != 1 )); then
  echo "Usage: $(basename "${BASH_SOURCE[0]}") INTERFACE" >&2
  exit 1
fi

interface="${1}"
any_ipv4="0.0.0.0/0"
subnet="10.42.0.0/24"
gateway="10.42.0.1"

ufw allow in on "${interface}" from "${any_ipv4}" port bootpc to "${any_ipv4}" port bootps
ufw allow in on "${interface}" from "${subnet}" to "${gateway}" port domain
ufw route allow in on "${interface}" from "${subnet}" to "${any_ipv4}"