Enables the monitoring mode of your wireless adapter and dumps found Wi-Fi probe requests on OSX.

wifi-probe-monitoring-osx

#!/bin/bash

# Stopping the script when a command's exit code signals a failure.                                                                                                                                    \
                                                                                                                                                                                                        
set -e
set -o pipefail

# Variables.                                                                                                                                                                                           \
                                                                                                                                                                                                        
WLAN_INTERFACE='en0'

# The help usage text.
USAGE="$(basename "$0") [-i] -- Puts the Wireless interface in monitor mode and dumps sniffed Wi-Fi probe requests."

# Retrieving arguments from the command-line.

while getopts ":i:hs" o; do
  case "${o}" in
    i) WLAN_INTERFACE=${OPTARG} ;;
    h) echo "$USAGE"
       exit 0 ;;
   \?) echo "Invalid option: -$OPTARG" >&2
       exit 1 ;;
    :) echo "Option -$OPTARG requires an argument." >&2
       exit 1 ;;
  esac
done

# Starts listening to Wi-Fi probe requests.
sudo tcpdump -l --monitor-mode -i $WLAN_INTERFACE -e --snapshot-length 256 type mgt subtype probe-req

# Re-setting the interface.
echo "Re-setting the '$WLAN_INTERFACE' network adapter ..."
sudo ifconfig $WLAN_INTERFACE down && sudo ifconfig $WLAN_INTERFACE up
echo "Done."