vpnclient_ynh/conf/scripts/route-up.d/10-vpnclient-set-firewall

#!/bin/bash

is_firewall_set() {
  local wired_device=$(ip route | awk '/default via/ { print $5; }')

  ip6tables -w -nvL OUTPUT | grep vpnclient_out | grep -q "${wired_device}" \
  && iptables -w -nvL OUTPUT | grep vpnclient_out | grep -q "${wired_device}"
}

if ! is_firewall_set; then
  bash /etc/yunohost/apps/vpnclient/conf/hook_post-iptable-rules
  cp /etc/yunohost/apps/vpnclient/conf/hook_post-iptable-rules /etc/yunohost/hooks.d/post_iptable_rules/90-vpnclient
fi

if is_firewall_set; then
  echo "[ OK ] IPv6/IPv4 firewall set"
else
  echo "[FAIL] No IPv6/IPv4 firewall set" >&2
  exit 1
fi