macOS: MAC address spoofing

dowifi.sh

#!/bin/bash

(( $(id -u) == 0 )) || exec sudo -E "$0" "$@"

# Set ATV_MAC to the MAC address of your Apple TV.
[[ -z $ATV_MAC ]] && ATV_MAC='aa:bb:cc:dd:ee:ff'

[[ -z $AIRPORT_INTERFACE ]] && AIRPORT_INTERFACE="$(networksetup -listnetworkserviceorder | grep -F 'Hardware Port: Wi-Fi' | awk '{print substr($NF,1,length($NF)-1)}')"
[[ -z $SSID ]] && SSID=$(networksetup -getairportnetwork "${AIRPORT_INTERFACE}" | cut -c24-)
[[ -z $ORIG_MAC ]] && ORIG_MAC="$(ifconfig "${AIRPORT_INTERFACE}" link | tail -1 | awk '{print $NF}')"

echo "Device: ${AIRPORT_INTERFACE}"
echo "Original MAC address: ${ORIG_MAC}"
echo "Changing MAC address to: ${ATV_MAC}..."

ifconfig "${AIRPORT_INTERFACE}" link "${ATV_MAC}"
networksetup -setairportpower "${AIRPORT_INTERFACE}" off
networksetup -setairportpower "${AIRPORT_INTERFACE}" on

echo "Associating with ${SSID}..."
sleep 1
networksetup -setairportnetwork "${AIRPORT_INTERFACE}" "${SSID}"

read -r -s -n 1 -p "Press any key after you've logged in.  "
echo ""

echo "Setting MAC address back to ${ORIG_MAC}..."
ifconfig "${AIRPORT_INTERFACE}" link "${ORIG_MAC}"
networksetup -setairportpower "${AIRPORT_INTERFACE}" off
networksetup -setairportpower "${AIRPORT_INTERFACE}" on