#!/bin/sh -e
echo 'cleaning iptables'
iptables -F -t nat
iptables -F INPUT
iptables -F FORWARD
iptables -F PREROUTING -t nat 
iptables -F POSTROUTING -t nat
iptables -F
echo '[done]'
echo 'setting up ip forwarding'

#here you need to put -i WIFI_INTERFACE_NAME -o INTERNET_INTERFACE_NAME
iptables -A FORWARD -i wlan0 -o eth0 -s 192.168.0.2 -j ACCEPT

#Put your INTERNET_INTERFACE_ADDRESS in place of 10.4.255.205
iptables -A POSTROUTING -t nat -s 192.168.0.2 -d 0.0.0.0/0 -j SNAT --to-source 10.4.255.205	

echo '[done]'
echo 'enabling kernel forwarding'
echo 1 > /proc/sys/net/ipv4/ip_forward
echo '[Done]'
echo '------------------------------------------------------------------' 
echo 'Set up AD-HOC network between this computer and your n900'
echo 'Your N900 should have following settings:'
echo 'IP: 192.168.0.2'
echo 'MASK: 255.255.255.0'
echo 'GW: 192.168.0.3'
echo 'DNS: 8.8.8.8'
echo 'You should disable power savings'
echo 'Your linux PC wireless interface should have following settings:'
echo 'IP: 192.168.0.3'
echo 'MASK: 255.255.255.0'
echo '------------------------------------------------------------------'
echo 'it may be nessesary to run on your N900 as root following command:'
echo "echo 'nameserver 8.8.8.8'>> /etc/resolv.conf"
echo 'If you have problems try to disable firewall.'
echo 'Re-run your firewall script or restart computer after use.'
echo '------------------------------------------------------------------'
echo 'Enjoy my crapy script:)' 
exit 0

#hardkorek