Raspberry Pi 3 access-point-setup

rPi3-ap-setup.sh

#!/bin/bash
#
# This version uses September 2017 august stretch image, please use this image
#

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

if [[ $# -lt 1 ]]; 
	then echo "You need to pass a password!"
	echo "Usage:"
	echo "sudo $0 yourChosenPassword [apName]"
	exit
fi

APPASS="$1"
APSSID="rPi3"

if [[ $# -eq 2 ]]; then
	APSSID=$2
fi

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
interface=wlan0
dhcp-range=10.0.0.2,10.0.0.5,255.255.255.0,12h
EOF

cat > /etc/hostapd/hostapd.conf <<EOF
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' /etc/network/interfaces
sed -i -- 's/iface wlan0 inet manual//g' /etc/network/interfaces
sed -i -- 's/    wpa-conf \/etc\/wpa_supplicant\/wpa_supplicant.conf//g' /etc/network/interfaces
sed -i -- 's/#DAEMON_CONF=""/DAEMON_CONF="\/etc\/hostapd\/hostapd.conf"/g' /etc/default/hostapd

cat >> /etc/network/interfaces <<EOF
# Added by rPi Access Point Setup
allow-hotplug wlan0
iface wlan0 inet static
	address 10.0.0.1
	netmask 255.255.255.0
	network 10.0.0.0
	broadcast 10.0.0.255

EOF

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

systemctl enable hostapd
systemctl enable dnsmasq

sudo service hostapd start
sudo service dnsmasq start

echo "All done! Please reboot"

This script is actually a little old now. I will try to find time to work on it, but the debian network stack has changed.