Simple Script to Set up an Access Point on the latest version of Raspbian Stretch

Raspbian-AP-Setup.sh

#!/bin/bash
# Raspbian-AP-Setup | Simple Script to Set up an Access Point on the latest version of Raspbian Stretch
# jasonsoto.com
# jsitech-sec.com


##############################################################################################################


if [ "$USER" != "root" ]; then
      echo "Permission Denied"
      echo "Run as the root user"
      exit
else
      echo "Cool, running as root"
fi

echo "[+] Setting up the Wifi AP......"
apt install hostapd dnsmasq
echo ""
echo "[+] Setting up Hostapd..."
echo ""
echo "[?] Please type in a SSID for the WiFi AP: " ; read wifissid
echo "[?] Please type in a Passphrase (Lenght 8 or Longer) for the WiFi AP: " ; read wifipass

cat > /etc/hostapd/hostapd.conf <<EOF
interface=wlan0
ssid=$wifissid
hw_mode=g
channel=7
ht_capab=[HT40][SHORT-GI-20][DSSS_CCK-40]
wmm_enabled=0
macaddr_acl=0
auth_algs=1
wpa=2
ignore_broadcast_ssid=0
wpa_passphrase=$wifipass
wpa_key_mgmt=WPA-PSK
wpa_pairwise=TKIP
rsn_pairwise=CCMP
EOF

cat > /etc/default/hostapd <<EOF
# Defaults for hostapd initscript
#
# See /usr/share/doc/hostapd/README.Debian for information about alternative
# methods of managing hostapd.
#
# Uncomment and set DAEMON_CONF to the absolute path of a hostapd configuration
# file and hostapd will be started during system boot. An example configuration
# file can be found at /usr/share/doc/hostapd/examples/hostapd.conf.gz
#
DAEMON_CONF="/etc/hostapd/hostapd.conf"

# Additional daemon options to be appended to hostapd command:-
# 	-d   show more debug messages (-dd for even more)
# 	-K   include key data in debug messages
# 	-t   include timestamps in some debug messages
#
# Note that -B (daemon mode) and -P (pidfile) options are automatically
# configured by the init.d script and must not be added to DAEMON_OPTS.
#
#DAEMON_OPTS=""
EOF

echo "[+] Setting up Dnsmasq...."
echo "interface wlan0" >> /etc/dhcpcd.conf
echo "static ip_address=192.168.1.1" >> /etc/dhcpcd.conf
echo "static routers=192.168.1.1" >> /etc/dhcpcd.conf
echo "static domain_name_servers=8.8.8.8" >> /etc/dhcpcd.conf      

echo "interface=wlan0" >> /etc/dnsmasq.conf
echo "domain-needed" >> /etc/dnsmasq.conf
echo "bogus-priv" >> /etc/dnsmasq.conf
echo "dhcp-range=192.168.1.8,192.168.1.15,12h" >> /etc/dnsmasq.conf

echo -n " ¿Do you Want to configure traffic forwarding (y/n): "; read config_forwarding
if [ "$config_forwarding" == "y" ]; then
    echo "net.ipv4.ip_forward=1" >> /etc/sysctl.conf
    sysctl -e -p
    iptables -t nat -A  POSTROUTING -o eth0 -j MASQUERADE
    iptables -A FORWARD -i eth0 -o wlan0 -m state --state RELATED,ESTABLISHED -j ACCEPT
    iptables -A FORWARD -i wlan0 -o eth0 -j ACCEPT
    echo "[+] Setting up iptables-persistent...."
    apt-get install iptables-persistent
    echo ""
    echo "[+]Traffic Forwarding configured!"
fi

echo ""
echo "[+] Done setting up  Wifi AP, Please Reboot......"