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Options for custom DNS and intra-VPN connectivity

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This commit is contained in:
Nyr
2014-11-04 21:57:36 +01:00
parent 2174037768
commit 215140b682
1 changed files with 49 additions and 6 deletions
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55
openvpn-install.sh
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@@ -114,6 +114,7 @@ if [[ -e /etc/openvpn/server.conf ]]; then
esac
done
else
clear
echo 'Welcome to this quick OpenVPN "road warrior" installer'
echo ""
# OpenVPN setup and first user creation
@@ -131,6 +132,19 @@ else
echo "This can be useful to connect under restrictive networks"
read -p "Listen at port 53 [y/n]: " -e -i n ALTPORT
echo ""
echo "Do you want to enable internal networking for the VPN?"
echo "This can allow VPN clients to communicate between them"
read -p "Allow internal networking [y/n]: " -e -i n INTERNALNETWORK
echo ""
echo "What DNS do you want to use with the VPN?"
echo " 1) Current system resolvers"
echo " 2) OpenDNS"
echo " 3) Level 3"
echo " 4) NTT"
echo " 5) Hurricane Electric"
echo " 6) Yandex"
read -p "DNS [1-6]: " -e -i 1 DNS
echo ""
echo "Finally, tell me your name for the client cert"
echo "Please, use one word only, no special characters"
read -p "Client name: " -e -i client CLIENT
@@ -182,10 +196,34 @@ else
sed -i 's|dh dh1024.pem|dh dh2048.pem|' server.conf
sed -i 's|;push "redirect-gateway def1 bypass-dhcp"|push "redirect-gateway def1 bypass-dhcp"|' server.conf
sed -i "s|port 1194|port $PORT|" server.conf
# Obtain the resolvers from resolv.conf and use them for OpenVPN
grep -v '#' /etc/resolv.conf | grep 'nameserver' | grep -E -o '[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}' | while read line; do
sed -i "/;push \"dhcp-option DNS 208.67.220.220\"/a\push \"dhcp-option DNS $line\"" server.conf
done
# DNS
case $DNS in
1)
# Obtain the resolvers from resolv.conf and use them for OpenVPN
grep -v '#' /etc/resolv.conf | grep 'nameserver' | grep -E -o '[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}' | while read line; do
sed -i "/;push \"dhcp-option DNS 208.67.220.220\"/a\push \"dhcp-option DNS $line\"" server.conf
done
;;
2)
sed -i 's|;push "dhcp-option DNS 208.67.222.222"|push "dhcp-option DNS 208.67.222.222"|' server.conf
sed -i 's|;push "dhcp-option DNS 208.67.220.220"|push "dhcp-option DNS 208.67.220.220"|' server.conf
;;
3)
sed -i 's|;push "dhcp-option DNS 208.67.222.222"|push "dhcp-option DNS 4.2.2.2"|' server.conf
sed -i 's|;push "dhcp-option DNS 208.67.220.220"|push "dhcp-option DNS 4.2.2.4"|' server.conf
;;
4)
sed -i 's|;push "dhcp-option DNS 208.67.222.222"|push "dhcp-option DNS 129.250.35.250"|' server.conf
sed -i 's|;push "dhcp-option DNS 208.67.220.220"|push "dhcp-option DNS 129.250.35.251"|' server.conf
;;
5)
sed -i 's|;push "dhcp-option DNS 208.67.222.222"|push "dhcp-option DNS 74.82.42.42"|' server.conf
;;
6)
sed -i 's|;push "dhcp-option DNS 208.67.222.222"|push "dhcp-option DNS 77.88.8.8"|' server.conf
sed -i 's|;push "dhcp-option DNS 208.67.220.220"|push "dhcp-option DNS 77.88.8.1"|' server.conf
;;
esac
# Listen at port 53 too if user wants that
if [[ "$ALTPORT" = 'y' ]]; then
iptables -t nat -A PREROUTING -p udp -d $IP --dport 53 -j REDIRECT --to-port $PORT
@@ -196,8 +234,13 @@ else
# Avoid an unneeded reboot
echo 1 > /proc/sys/net/ipv4/ip_forward
# Set iptables
iptables -t nat -A POSTROUTING -s 10.8.0.0/24 -j SNAT --to $IP
sed -i "/# By default this script does nothing./a\iptables -t nat -A POSTROUTING -s 10.8.0.0/24 -j SNAT --to $IP" /etc/rc.local
if [[ "$INTERNALNETWORK" = 'y' ]]; then
iptables -t nat -A POSTROUTING -s 10.8.0.0/24 ! -d 10.8.0.0/24 -j SNAT --to $IP
sed -i "/# By default this script does nothing./a\iptables -t nat -A POSTROUTING -s 10.8.0.0/24 ! -d 10.8.0.0/24 -j SNAT --to $IP" /etc/rc.local
else
iptables -t nat -A POSTROUTING -s 10.8.0.0/24 -j SNAT --to $IP
sed -i "/# By default this script does nothing./a\iptables -t nat -A POSTROUTING -s 10.8.0.0/24 -j SNAT --to $IP" /etc/rc.local
fi
# And finally, restart OpenVPN
/etc/init.d/openvpn restart
# Try to detect a NATed connection and ask about it to potential LowEndSpirit