#!/bin/bash
# Change the DNS server on Ubuntu
# v1.1 by JaiBee, 2009
 
DNS1="217.79.186.148"		# OpenNIC (NRW, keine Logs)
DNS2="81.89.98.6"		# OpenNIC (Bayern, Logs anonymisiert)
DNS3="94.75.228.29"		# German Privacy Foundation e.V.
 
# weitere:
# DNSx="208.67.220.220"		# OpenDNS
# DNSx="85.214.73.63"		# FoeBuD e.V.
# DNSx="213.73.91.35"		# Chaos Computer Club Berlin
 
# # # # # # # # # # # # #
 
echo "- Lege Backup an"
sudo cp /etc/dhcp3/dhclient.conf /etc/dhcp3/dhclient.conf.bak
 
echo "- Trage DNS-Server in \"/etc/dhcp3/dhclient.conf\" ein"
sudo sed -i "/prepend domain-name-servers/c\prepend domain-name-servers $DNS1,$DNS2,$DNS3;" /etc/dhcp3/dhclient.conf
sudo sed -i 's/domain-name-servers, //' /etc/dhcp3/dhclient.conf
 
echo "- Starte Dienste neu:"
sudo /etc/init.d/NetworkManager restart
sudo /etc/init.d/networking restart
# sudo restart -q network-manager	# ab Ubuntu 9.10
 
echo "- Kontrolliere Einstellungen"
for i in $(seq 1 3)
do
	USED=$(nslookup www.google.com | grep Server | cut -f3)
 
	if [ "$USED" == $DNS1 -o "$USED" == $DNS2 -o "$USED" == $DNS3 ]; then
	  echo "=> KONFIGURATION ERFOLGREICH"
	  echo "   verwende $USED"
	  exit
	fi
done
 
echo "=> KONFIGURATION FEHLGESCHLAGEN"
echo "  Spiele Backup zurück"
sudo mv /etc/dhcp3/dhclient.conf.bak /etc/dhcp3/dhclient.conf

sudo /etc/init.d/NetworkManager restart
sudo /etc/init.d/networking restart

sudo restart -q network-manager