Simple script for MAC address spoofing for Bash on OSX

macycle

#!/opt/local/bin/bash
# NEWS (4/7/16) Working.
# This is an active experiment; use at your own peril!
# Comments and criticism are most welcome!
# Motivation, to get devices without captive portal support online.
#
#
# environment stuff
unset CDPATH

declare -A devices

function macycle () {
    # load config file!
    if [ -f "${HOME}"/.macyclerc ]; then
        . "${HOME}"/.macyclerc
        if [ "${#devices[@]}" -eq 0 ]; then
            echo "Device list is empty. Please try adding key-value pairs to 'devices[]' array."
            exit 65
        fi
    else
        #echo "derp"
        # while read -rp "RC file '.macyclerc' does not exist. Create one? (y/n): " val && if [[ $val == 'yes' ]]; do ; done
        # func_configurate || exit 2
        echo 'Create ~/.macyclerc'
        exit 0
    fi

    
    ## test
    key="${1}"

    # find networkInterface
    routeIP='8.8.8.8' # Google DNS.
    networkInterface=$(route get "${routeIP}" | egrep -o '(interface.*en)[0-9]+' | cut -d' ' -f2)

    
    [[ -z "${networkInterface}" ]] && exit 69;
    #
    #
    #
    if [ -z "${key}" ]
    then
        promptValue
    else
        if (("${#devices[$key]}" > 0))
	then
	    sudo ifconfig "${networkInterface}" ether "${devices[$key]}" || exit 2
            printf 'Now spoofing %s. Wait for network interface to powercycle...' "${key}"
	    networksetup -setairportpower "${networkInterface}" off; networksetup -setairportpower "${networkInterface}" on
            until networksetup -getairportpower en1  | grep -i "on" > /dev/null 2>&1 && route get 8.8.8.8 2>&1 | grep -vi "not in table"; do echo "trying...";sleep 2; done
            printf 'done.\n'
            exit 0
	else
	    printf "\e[31mbad choice\e[0m\n"
	    promptValue
	    exit 64
	fi
    fi
}


function promptValue() {
    printf "%b" "(\e[38;5;82mactive\e[0m) d8:a2:5e:94:49:aa\n" | column -t
    for i in "${!devices[@]}"
    do
	printf '%7s\n' "${i} :  ${devices[$i]}"
    done | column -t

    while read -rp "Choose new MAC address: " val && [ -z "${val}" ]; do :; done

    if (("${#devices[$val]}" > 0))
    then
	
	macycle "${val}"
    else
	printf "\e[31mbad choice\e[0m\n"
        exit 64
    fi
}
function default() {
    ifconfig "${networkInterface}" | grep ether | cut -d" " -f2
}
#
#
function func_menu_help() {
    e=$(printf "\e")
    NORMAL="$e[0m"
    WHITE="$e[1;37m"
    cat <<EOM
${WHITE}macycle -- Transcend the Captive Portal.${NORMAL}
A bash program for changing your (WiFi) adapter's
Media Access Controller (MAC) address.
-c: Create an empty configuration file.
EOM
}
#
function func_configurate() {
    # if no RC, then create "empty" one.
    # if exists, state as much
    # allow for adding new content through script
    tee "${HOME}"/.macyclerc <<EOF
declare -A devices=(
		['dev1']='aa:aa:aa:aa:aa:aa'
)
EOF
}

#

while getopts "chv" FLAG; do
    case $FLAG in
	c) #set c
            printf 'Create RC file?\n'
            #func_configurate
            # touch "${HOME}/.macyclerc" || exit 126
            exit 0;
            ;;
        h|help) #set h
            func_menu_help
            exit 0;
            ;;
        v) # get version
            printf 'v0.1.1\n'
            exit 0;
            ;;
        \?) #unrecognized option - show help
	    echo -e \\n"Option -${BOLD}$OPTARG${NORM} not allowed."
	    exit 2
	    ;;
    esac
done
#
macycle "${1}"


#macycle && exit 0
## To Do
# add to bpkg
# register? script as job
# use networksetup -listallhardwareports for hard-coded MAC addresses
# functional MAC address generator
# for  improved LINUX support:
## http://xmodulo.com/spoof-mac-address-network-interface-linux.html
# multi hardware port support (BT, etc)
# make MAC agnostic
# there is definite room to simplify things.
###################################
# SECTION: Thanks.
###################################
# eccerr0r and BitJam @ forums.gentoo.org
###################################
# Local Variables:
# firestarter: "gist -u edb5e9db9248cc5d7131 %p"
# End: