#!/bin/bash

# Temos que configurar a VPN gateway (duh)
# O VPN client é o nosso telemovel, eu suponho
# Ou qualquer dispositivo ligado pela rede externa 
# ao VPN.
#
# O gateway client é a pont entre a rede externa 193.136.212.0/24
# E a rede interna 10.60.0.0/24

# NOTE(vasco): 
# Ao configurar a maquina virtual em si deixei a rede externa primeiro (enp0s8)
# E a rede interna como a segunda interface (enp0s9).

# --- variaveis aqui pf joao fr fr fr aaaaa ---#
helloworld="print"
if_fora="enp0s8"
if_dentro="enp0s9"
ip_fora="193.136.212.1"
ip_dentro="10.60.0.3"
mega_tunel="tun0"
ip_mega_tunel="10.8.0.1/24"

# --- interfaces ---
ifconfig $if_fora $ip_fora netmask 255.255.255.0
ifconfig $if_dentro $ip_dentro netmask 255.255.255.0

# --- instalar packages ---
yum install -y epel-release openvpn iptables-services


# --- desativar firewalld ---
systemctl stop firewalld
systemctl disable firewalld
systemctl mask firewalld
systemctl enable iptables
iptables -F
# ativar poen vpn
systemctl enable --now openvpn

# --- ip forwarding --- #
echo "net.ipv4.ip_forward = 1" >> /etc/sysctl.conf
sysctl -p /etc/sysctl.conf

# --- nat forwardin de vpn para clientes --- #
iptables -A INPUT  -p udp --dport 1194 -j ACCEPT # :O
iptables -A FORWARD -i $mega_tunel -o $if_dentro -j ACCEPT # :P
iptables -A FORWARD -i $if_dentro -o $mega_tunel -j ACCEPT # ;)
iptables -t nat -A POSTROUTING -s $ip_mega_tunel -o $if_fora -j MASQUERADE # :D
iptables-save > /etc/sysconfig/iptables # :3