#!/usr/bin/env bash

echo "Choose an action:"
echo "1) Create new PoPToP VPN and create new user"
echo "2) Create new user"

read x

if test $x -eq 1; then
echo "Enter name for new user:"

read u
echo "Enter a password:"

read p
# get the VPS IP
ip=`ifconfig eth0 | grep 'inet addr' | awk {'print $2'} | sed s/.*://`

echo
echo "Set up PoPToP"

apt-get update
apt-get install pptpd

echo
echo "Create config"

cat > /etc/ppp/pptpd-options << END

name pptpd
refuse-pap
refuse-chap
refuse-mschap
require-mschap-v2
require-mppe-128
ms-dns 8.8.8.8
ms-dns 8.8.4.4
proxyarp
nodefaultroute
lock
nobsdcomp

END

# setting up pptpd.conf
echo "option /etc/ppp/pptpd-options" > /etc/pptpd.conf
echo "logwtmp" >> /etc/pptpd.conf
echo "localip $ip" >> /etc/pptpd.conf
echo "remoteip 10.1.0.1-100" >> /etc/pptpd.conf

# adding new user
echo "$u * $p *" >> /etc/ppp/chap-secrets
echo
echo "Add redirect IPv4 and add into autoload"

cat >> /etc/sysctl.conf << END

net.ipv4.ip_forward=1

END

sysctl -p

echo
echo "Update IPtables Routing and add into autoload"

iptables -t nat -A POSTROUTING -j SNAT --to $ip
# saves iptables routing rules and enables them on-boot
iptables-save > /etc/iptables.conf
cat > /etc/network/if-pre-up.d/iptables << END

#!/bin/sh
iptables-restore < /etc/iptables.conf

END

chmod +x /etc/network/if-pre-up.d/iptables
cat >> /etc/ppp/ip-up << END

ifconfig ppp0 mtu 1400

END

echo
echo "Restart PoPToP"

/etc/init.d/pptpd restart

echo
echo "Installation is finished"
echo "Your IP: $ip? login and password:"
echo "Login:$u ##### Password: $p"

# runs this if option 2 is selected
elif test $x -eq 2; then
echo "Enter name for new user:"
read u
echo "Enter a password:"
read p

# get the VPS IP
ip=`ifconfig venet0:0 | grep 'inet addr' | awk {'print $2'} | sed s/.*://`
# adding new user

echo "$u * $p *" >> /etc/ppp/chap-secrets
echo
echo "New user is created"
echo "Server IP: $ip, credential:"
echo "Login:$u ##### Password: $p"

else
echo "Wrong option, pleas try one more..."
exit
fi