changeWifiPassword.sh

#!/bin/bash

# Make sure only root can run our script
if [[ $EUID -ne 0 ]]; then
   echo "This script must be run as root" 1>&2
   exit 1
fi

# Generate new wlan password and safe it. Don't use special chars to make it simpler
WLANPSK=$(pwgen -1Bv |tr '/' '$')
sed -ie "s/wpa_passphrase=.*/wpa_passphrase=${WLANPSK}/" /etc/hostapd.conf
service hostapd reload

ssid=$(grep "^ssid=" /etc/hostapd.conf|head -n 1|cut -d '=' -f 2)
ibs=$(grep "^ignore_broadcast_ssid=" /etc/hostapd.conf|head -n 1|cut -d '=' -f 2)
hidden="false"
if [ "${ibs}" == "0" ]
then
    hidden="true"
fi

# Generate QR code pictures for Android and Windows
qrencode -t PNG -o /tmp/android.png -s 4 "WIFI:T:WPA;S:${ssid};P:${WLANPSK};H:${hidden};"
echo "WIFI:T:WPA;S:${ssid};P:${WLANPSK};H:${hidden};"
./terminalqr.py "WIFI:T:WPA;S:${ssid};P:${WLANPSK};H:${hidden};" >/tmp/android.txt
qrencode -t PNG -o /tmp/windows.png -s 4 "WIFI;T:WPA;S:${ssid};P:${WLANPSK};H:${hidden};"
./terminalqr.py "WIFI:T:WPA;S:${ssid};P:${WLANPSK};H:${hidden};" >/tmp/windows.txt

# IOS requires a hosted webpage which I do not want to host
# Use the copy to clipboard function for the password and manually connect instead.
qrencode -t PNG -o /tmp/ios.png -s 4 "${WLANPSK}"
./terminalqr.py "${WLANPSK}" >/tmp/ios.txt

echo "New WLAN password was generated and hostapd reloaded."