ndn-wifi-passwd

#!/bin/bash

PASS1=""
PASS_MATCH=0


updatePasswd() {
    newpass=$1
    pass_success=0

    tempdir=$(mktemp -dt) &&
    sed -re "s/wpa_passphrase=.+/wpa_passphrase=$newpass/" /etc/hostapd/hostapd.conf > "$tempdir/hostapd.conf" &&
    sed -re "/ssid=\"Raspi_NDN\"/,+5{s/psk=.+$/psk=\"$newpass\"/}"  /etc/wpa_supplicant/wpa_supplicant.conf > "$tempdir/wpa_supplicant.conf" &&
    sudo cp /etc/hostapd/hostapd.conf /etc/hostapd/hostapd.conf.bak &&
    sudo cp /etc/wpa_supplicant/wpa_supplicant.conf /etc/wpa_supplicant/wpa_supplicant.conf.bak &&
    sudo mv "$tempdir/hostapd.conf" /etc/hostapd/hostapd.conf &&
    sudo mv "$tempdir/wpa_supplicant.conf" /etc/wpa_supplicant/wpa_supplicant.conf &&
    pass_success=1 &&
    echo "Password updated."
}

while [ "$PASS_MATCH" -eq 0 ]; do
    while [ -z "$PASS1" ]; do
        read -r -s -p "Enter new wifi password: " PASS1
    done
    echo
    read -r -s -p "Confirm new password: " PASS2
    echo
    echo
    if [ "$PASS1" = "$PASS2" ]; then 
        PASS_MATCH=1
        updatePasswd $PASS1
        if [ "$pass_success" -eq 0 ]; then
            echo "Could not update configuration files"
            exit 1
        else
            service hostapd status
            if [[ $? -eq 0 ]]; then
                echo "Restarting hostapd"
                sudo service hostapd restart
            else 
                echo "Restarting wpa_supplicant"
                sudo ifconfig wlan0 down
                sudo dhclient -r wlan0
                sudo killall wpa_supplicant
                sudo wpa_supplicant -dd -iwlan0 -c /etc/wpa_supplicant/wpa_supplicant.conf 2>&1 | logger -t wpa_supplicant &
                sudo ifconfig wlan0 up
                sudo dhclient -1 wlan0
            fi
        fi
    else 
        echo "Passwords do not match."
        PASS1=""
    fi
done