MAC Address Switcher v1.1.0

mac-switch.sh

#!/bin/bash

# MAC Address Switcher v1.1.0
# Written by lesander - http://github.com/lesander
# Licensed under GPLv3
# Tested on Ubuntu 14.04

# - Set MAC addresses and settings.
address1=""
address2=""
network=""
networks=$(ls /sys/class/net | tr '\n' '/' | sed '$s/ $/\n/')
networks=${networks%?}

# - Check if addresses are set.
if [[ $address1 == "" || $address2 == "" || $network == "" || $1 == "settings" ]]; then
  
  # Determine the case.
  if [ $1 == "settings" ]; then
    echo "[*] MAC Address Switcher - Change Settings"
  else 
    echo "[!] Missing address(es) or network in configuration."
  fi
  
  # Pick a network.
  read -p "[?] Which network would you like to use? [$networks] "
  newnetwork=$REPLY
  
  # Get address1 (current mac).
  current=$(cat /sys/class/net/$newnetwork/address)
  newaddress1=$current
  echo "[*] Your current MAC address for network $newnetwork is $current."
  
  # Ask for address2.
  read -p "[?] Please enter the MAC address you want to switch to / from: "
  newaddress2=$REPLY
  
  # Save to this file.
  sed -i -e '0,/address1="'$address1'"/s//address1="'$newaddress1'"/' ${0}
  sed -i -e '0,/address2="'$address2'"/s//address2="'$newaddress2'"/' ${0}
  sed -i -e '0,/network="'$network'"/s//network="'$newnetwork'"/' ${0}
  echo "[!] Saved addresses and network to file."
  exit
fi

# - Get current MAC address.
current=$(cat /sys/class/net/$network/address)

# - Print info.
echo "[*] MAC Address Switcher v1.1.0"
echo "[*] Current MAC address for network $network is '$current'."

# - Make sure we're running as root.
echo "[!] This program needs sudo permissions to alter the system's MAC address."
sudo -v
if [ $EUID == "0" ]; then
  echo "[!] Please run this program as sudo." 
  exit 2
fi

# - Disable the network.
echo "[*] Disabling network $network."
sudo ifconfig $network down

# - Switch MAC address.
if [ $current == $address1 ]; then
  echo "[*] Switching to MAC address 2 $address2."
  sudo ifconfig $network hw ether $address2
elif [ $current == $address2 ]; then
  echo "[*] Switching to MAC address 1 $address1."
  sudo ifconfig $network hw ether $address1
else
  echo "[*] Current MAC address is neither of the saved addresses."
fi

# - Re-enable network.
echo "[*] Re-enabling network $network."
sleep 3
sudo ifconfig $network up