#!/bin/sh
set -eu

: "${RADIUS_SECRET:?RADIUS_SECRET must be set in .env}"

# pam_radius format: server[:port]  secret  timeout
# 60s timeout leaves room for the user to approve a Duo push.
printf '127.0.0.1:1812\t%s\t60\n' "$RADIUS_SECRET" > /etc/pam_radius_auth.conf
chmod 600 /etc/pam_radius_auth.conf

mkdir -p /var/lib/openvpn
[ -c /dev/net/tun ] || { mkdir -p /dev/net; mknod /dev/net/tun c 10 200; }

# OpenVPN does NOT pass its inherited environment to hook scripts — it
# builds a clean env for them. Hand learn-address.sh its settings via a
# file it sources (the hook runs as nobody after the privilege drop).
sq() { printf '%s' "$1" | sed "s/'/'\\\\''/g"; }
if [ -n "${TECHNITIUM_ADMIN_PASSWORD:-}" ] && [ -n "${VPN_DNS_ZONE:-}" ]; then
  {
    printf "TECHNITIUM_ADMIN_PASSWORD='%s'\n" "$(sq "$TECHNITIUM_ADMIN_PASSWORD")"
    printf "VPN_DNS_ZONE='%s'\n" "$(sq "$VPN_DNS_ZONE")"
  } > /etc/openvpn/learn-address.env
  chown nobody:nogroup /etc/openvpn/learn-address.env
  chmod 400 /etc/openvpn/learn-address.env
else
  rm -f /etc/openvpn/learn-address.env
fi

exec openvpn --cd /etc/openvpn --config server.conf