unixorn/tumult.plugin.zsh

#!/usr/bin/env bash
#
# Based on http://www.zdziarski.com/blog/?p=2738

if [[ "$(uname -s)" != 'Darwin' ]]; then
  echo 'Sorry, this script only works on macOS'
  exit 1
fi

INTERFACE=en0
# shellcheck disable=SC2086
PLUGIN_LIB="$(dirname $0)/../lib"

OUI="${PLUGIN_LIB}/oui.txt"
OUI_LEN=$(wc -l "${OUI}" | awk '{print $1;}')
if [ ! -f "${OUI}" ]; then
    echo "WTF: ${OUI}"
fi

while true; do
    STATUS=$(ifconfig ${INTERFACE} | grep status: | awk '{print $2}')
    echo "STATUS: $STATUS"
    if [ "$STATUS" = "inactive" ]; then
        # shellcheck disable=SC2004
        R=$(((RANDOM % ${OUI_LEN})+1))
        # shellcheck disable=SC2086
        PREFIX="$(head -$R $OUI | tail -1)"
        echo "PREFIX: ${PREFIX}"
        CMD="sudo ifconfig ${INTERFACE} ether ${PREFIX}:"
        for i in $(seq 1 6); do
            R=$(((RANDOM % 15)+1))
            C=$(echo "obase=16; $R" | bc)
            CMD="$CMD$C"
            if [ $((i % 2)) = 0 ] && [ "$i" != 6 ]; then
                CMD="$CMD:"
            fi
        done
        RESULT=$($CMD)
        echo "cmd: $CMD"
        echo "result: $RESULT"
    fi
    sleep 30
done