station_scanner.rb

station_scanner.rb

require 'time'

KNOWN_MACS = {
  '**:**:**:**:**:**' => 'Marcs Handy'
}

def oui_lookup(mac)
  owner = KNOWN_MACS[mac] || 'unknown'
  oui = mac.upcase.tr(': ','-')[0..7]
  vendor = `grep '^#{oui}' oui.txt | cut -f3`.strip
  "#{owner} - #{vendor}"
rescue
  $!
end

macs = {}

f = IO.popen "tshark -i mon0 -l -R 'wlan.fc.type_subtype == 0x04' -Tfields -e frame.time -e wlan.sa -e wlan.da -e radiotap.dbm_antsignal -e radiotap.dbm_antnoise"
last_mac = nil
while true
  data   = f.readline.strip.split("\t")
  time   = Time.parse data[0]
  mac    = data[1]
  signal = data[3]
  last_time = macs[mac]
  macs[mac] = time
  time_diff = time - last_time if last_time
  puts "#{mac}\t#{(time_diff||-1).round}\t#{oui_lookup(mac)}\t#{signal}\t(#{macs.size})" if !last_time || (time_diff && time_diff > 2)
  last_mac = mac
end