rpi3-apsetup

#!/bin/bash
#

if [ "$EUID" -ne 0 ]
	then echo "Must be root"
	exit
fi

if [[ $# -lt 2 ]]; 
	echo "Usage:"
	echo "$0 password ssid"
	exit
fi

APPASS="$1"
APSSID="$2"

NWFN=/etc/network/interfaces.d/wlan0

apt-get remove --purge hostapd -yqq
apt-get update -yqq
apt-get upgrade -yqq
apt-get install hostapd dnsmasq -yqq

cat > /etc/dnsmasq.conf <<EOF
## setup by script $0
interface=wlan0
dhcp-range=192.168.3.100,192.168.3.199,255.255.255.0,12h
EOF

cat > /etc/hostapd/hostapd.conf <<EOF
## setup by script $0
interface=wlan0
hw_mode=g
channel=10
auth_algs=1
wpa=2
wpa_key_mgmt=WPA-PSK
wpa_pairwise=CCMP
rsn_pairwise=CCMP
wpa_passphrase=$APPASS
ssid=$APSSID
ieee80211n=1
wmm_enabled=1
ht_capab=[HT40][SHORT-GI-20][DSSS_CCK-40]
EOF

sed -i -- 's/allow-hotplug wlan0//g' $NWFN
sed -i -- 's/iface wlan0 inet manual//g' $NWFN
sed -i -- 's/    wpa-conf \/etc\/wpa_supplicant\/wpa_supplicant.conf//g' $NWFN
sed -i -- 's/#DAEMON_CONF=""/DAEMON_CONF="\/etc\/hostapd\/hostapd.conf"/g' /etc/default/hostapd

cat >> $NWFN <<EOF

## setup by script $0
allow-hotplug wlan0
iface wlan0 inet static
	address 192.168.3.1
	netmask 255.255.255.0
	network 192.168.3.0
	broadcast 192.168.3.255

EOF

echo "denyinterfaces wlan0" >> /etc/dhcpcd.conf

systemctl unmask hostapd
systemctl enable hostapd
systemctl enable dnsmasq

service hostapd start
service dnsmasq start

echo "All done! Please reboot"