#!/bin/bash

mkdir -p /home/pi/restore_etc

cp /etc/dhcp/dhcpd.conf /home/pi/restore_etc
cp /etc/default/isc-dhcp-server /home/pi/restore_etc
cp /etc/network/interfaces /home/pi/restore_etc
cp /etc/init.d/hostapd /home/pi/restore_etc
cp /etc/default/hostapd /home/pi/restore_etc/etc.default.hostapd
cp /etc/sysctl.conf /home/pi/restore_etc


sudo apt-get update
sudo apt-get install hostapd isc-dhcp-server -y
sudo sed -i '/domain-name-servers ns1.example.org/s/^/#/g' /etc/dhcp/dhcpd.conf
sudo sed -i '/domain-name \"example.org\";/s/^/#/g' /etc/dhcp/dhcpd.conf
sudo sed -i '/authoritative;/s/^#//g' /etc/dhcp/dhcpd.conf
cat >>/etc/dhcp/dhcpd.conf <<EOF
subnet 192.168.99.0 netmask 255.255.255.0 {
    range 192.168.99.100 192.168.99.150;
    option broadcast-address 192.168.99.255;
    option routers 192.168.99.1;
    default-lease-time 600;
    max-lease-time 7200;
    option domain-name "local";
    option domain-name-servers 8.8.8.8, 8.8.4.4;
}
EOF

sed -i '/INTERFACES=\"\"/c\INTERFACES=\"wlan0\"' /etc/default/isc-dhcp-server

sudo sed -i '/iface wlan0 inet manual/s/^/#/g' /etc/network/interfaces
sudo sed -i '/wpa_supplicant.conf/s/^/#/g' /etc/network/interfaces
cat >>/etc/network/interfaces <<EOF
iface wlan0 inet static
  address 192.168.99.1
  netmask 255.255.255.0
  post-up iw dev $IFACE set power_save off
EOF

cat >>/etc/hostapd/hostapd.conf <<EOF
interface=wlan0
ssid=WiPi
hw_mode=g
channel=6
macaddr_acl=0
auth_algs=1
ignore_broadcast_ssid=0
wpa=2
wpa_passphrase=raspberry
wpa_key_mgmt=WPA-PSK
wpa_pairwise=TKIP
rsn_pairwise=CCMP
EOF

echo "net.ipv4.ip_forward=1" >>/etc/sysctl.conf

sudo sh -c "echo 1 > /proc/sys/net/ipv4/ip_forward"

sudo iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE
sudo iptables -A FORWARD -i eth0 -o wlan0 -m state --state RELATED,ESTABLISHED -j ACCEPT
sudo iptables -A FORWARD -i wlan0 -o eth0 -j ACCEPT
sudo sh -c "iptables-save > /etc/iptables.ipv4.nat"

echo "up iptables-restore < /etc/iptables.ipv4.nat" >>/etc/network/interfaces

sed -i '/DAEMON_CONF=/c\DAEMON_CONF=/etc/hostapd/hostapd.conf' /etc/init.d/hostapd
sed -i '/#DAEMON_CONF=\"\"/c\DAEMON_CONF=\"/etc/hostapd/hostapd.conf\"' /etc/default/hostapd

sudo update-rc.d hostapd enable
sudo update-rc.d isc-dhcp-server enable