#!/bin/bash

# INSTALL&SETUP PUBLIC WiFi ACCESS POINT
# TESTED ON UBUNTU 18.04 SERVER

sudo -s

#-------------------------------------------------------
# Unblock WiFi

apt install rfkill

systemctl stop NetworkManager
systemctl disable NetworkManager

rfkill unblock wifi

#-------------------------------------------------------
# Setup WiFi Mode

apt install net-tools wireless-tools

AP=$(iwconfig | grep IEEE | cut -f 1 -d " ")

ifconfig $AP down
iwconfig $AP mode ad-hoc
ifconfig $AP up

#-------------------------------------------------------
# Install and Setup DHCP server

apt install isc-dhcp-server

cat > /etc/default/isc-dhcp-server.conf << EOF
INTERFACESv4="$AP"
EOF

cat > /etc/dhcp/dhcpd.conf << EOF
subnet 10.0.0.0 netmask 255.255.255.224 {
    range 10.0.0.2 10.0.0.10;
}
EOF

#-------------------------------------------------------
# Install and Setup Hoastapd (public WiFi-AP)

apt install hostapd

cat > /etc/hostapd.conf << EOF
interface=$AP
driver=nl80211
ssid=UbuntuServer1804-Ap
hw_mode=g
channel=6
wpa=2
wpa_passphrase=parolone
EOF

cat > /etc/default/hostapd << EOF
DAEMON_CONF="/etc/hostapd.conf"
RUN_DAEMON="yes"
EOF

#-------------------------------------------------------
# Start DHCP and WiFi-AP (set manual-only startup)

ifconfig $AP 10.0.0.1

systemctl unmask  isc-dhcp-server
systemctl disable isc-dhcp-server
systemctl restart isc-dhcp-server

systemctl unmask  hostapd
systemctl disable hostapd
systemctl restart hostapd

#-------------------------------------------------------
# Check DHCP

netstat -antup
dhcp-lease-list --lease /var/db/dhcpd/dhcpd.leases