Automatically generate and assign a new MAC address for the local system.

macspoof.sh

#! /bin/bash
################################################################################
#                                                         __ 
#                                                        / _|
#             _ __ ___   __ _  ___ ___ _ __   ___   ___ | |_ 
#            | '_ ` _ \ / _` |/ __/ __| '_ \ / _ \ / _ \|  _|
#            | | | | | | (_| | (__\__ \ |_) | (_) | (_) | |  
#            |_| |_| |_|\__,_|\___|___/ .__/ \___/ \___/|_|  
#                                     | |                    
#                                     |_|                    
#
################################################################################
#
## SCRIPT INFO: macspoof.sh
#
#    Automatically generate and assign a new MAC address for the local system
#
#    Default execution (without optional parameters) will generate a new MAC
#    address and assign that new address to the system's local wireless card.
#    This will effectively change the local system's hardware identity.
#
## USAGE EXAMPLE:
#
#    ./macspoof.sh [OPTIONAL_PARAMETERS]
#
## OPTIONS:
#
#    -h|--help              Print this help text
#    -s|--silent            Avoid printing outputs to the terminal
#    -m|--mac               Output a ramdomly-generated MAC address
#    -i|--interface         Output the system's wireless interface
#    -a|--mac-interface     Output a randomly-generated MAC address
#                           and the system's wireless interface
#
## ATTRIBUTION:
#
#    Inspired by @ghzmdr --> ghzmdr.github.io
#    View inspiration source here: gist.github.com/ghzmdr/96325a8238380e631c98
# 
#    Expanded and assembled by h8rt3rmin8r for ResoNova International Consulting
#    (resonova.com) for research purposes.
#
#    Download the source: http://bit.ly/macspoof-sh
#
################################################################################

# Variable assignments and function declarations
INTERFACE=$(iw dev | awk '$1=="Interface"{print $2}')
ERR_OUT="ERROR: Something went wrong"
VB_SET="/dev/stdout"
MANPAGE="https://pastebin.com/raw/KEE8CZJr"

function macgen() {
    # MAC Generator loop
    MAC="" # Intentionally blank
    for i in {0..5}; do
        VAL=$RANDOM; PART=$(printf "%2X" $VAL); MAC+=$(printf "%.2s" $PART)
        if [ $i -lt 5 ]; then MAC+=":"; fi
    done
}

function macspoof() {
    # Generate and apply a new MAC address to the system interface
    macgen
    # Inform user as to why password is required at this point
    echo "Switching local MAC address with sudo..." &>${VB_SET}
    sleep 0.6
    sudo ip link set dev ${INTERFACE} down
    sudo ip link set dev ${INTERFACE} address ${MAC}
    sudo ip link set dev ${INTERFACE} up
    echo "Done!" &>${VB_SET}; echo &>${VB_SET}
    echo "${INTERFACE} has been set to ${MAC}" &>${VB_SET}
    exit 0
}

# Validation filter (sanity check 'iw dev' output)
if [[ "$(echo ${INTERFACE} | wc -c)" -gt 8 ]]; then echo ${ERR_OUT}; exit 1; fi

# Optional output and process variations
if [[ ! "x$1" == "x" ]];
then
    case "$1" in
        -s|-silent|--silent|-q|-quiet|--quiet)
            # Optional silent runtime
            VB_SET="/dev/null"
            ;;
        -m|-mac|--mac|--mac-address)
            # Output random MAC only (for 3rd party use cases)
            macgen; echo "${MAC}"; exit 0
            ;;
        -i|-interface|--interface)
            # Output interface only (for 3rd party use cases)
            echo "${INTERFACE}"; exit 0
            ;;
        -a|-all|--all|-im|-mi|-mac-interface|--mac-interface)
            # Output interface and random MAC only (for 3rd party use cases)
            macgen; echo "${MAC} -- ${INTERFACE}"; exit 0
            ;;
        -h|-help|--help)
            # Print the script help text
            echo
            curl -s ${MANPAGE}
            echo; echo; exit
            ;;
    esac
fi

# LET'S GO!
macspoof