Class: Panopticon::WlanUtilization

Inherits:
Object
  • Object
show all
Defined in:
lib/panopticon/wlan_utilization.rb

Constant Summary collapse

FREQ2CHAN = 
{
  0     => 0, # why radiotap.channel.freq can be 0?
  # 2.4GHz
  2412  => 1,
  2417  => 2,
  2422  => 3,
  2427  => 4,
  2432  => 5,
  2437  => 6,
  2442  => 7,
  2447  => 8,
  2452  => 9,
  2457  => 10,
  2462  => 11,
  2467  => 12,
  2472  => 13,
  2484  => 14,

  # japan client only
  5170  => 34,
  5190  => 38,
  5210  => 42,
  5230  => 46,

  # W52
  5180  => 36,
  5200  => 40,
  5220  => 44,
  5240  => 48,

  # W53
  5260  => 52,
  5280  => 56,
  5300  => 60,
  5320  => 64,

  # W56
  5500  => 100,
  5520  => 104,
  5540  => 108,
  5560  => 112,
  5580  => 116,
  5600  => 120,
  5620  => 124,
  5640  => 128,
  5660  => 132,
  5680  => 136,
  5700  => 140,
  5745  => 149,
  5765  => 153,
  5785  => 157,
  5805  => 161,
  5825  => 165,


  # 802.11j
  4920  => 184,
  4940  => 188,
  4960  => 192,
  4980  => 194,
}
REG_FREQ = 
/^\s*frequency:\s+(\d+) /
REG_ACTIVE = 
/^\s*channel active time:\s+(\d+) (|m)s$/
REG_BUSY = 
/^\s*channel busy time:\s+(\d+) (|m)s$/

Instance Method Summary collapse

Constructor Details

#initialize(ifname) ⇒ WlanUtilization

Returns a new instance of WlanUtilization.



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# File 'lib/panopticon/wlan_utilization.rb', line 69

def initialize ifname
  @ifname = ifname
  @ifname_exists = interface_exists?(ifname)
  unless @ifname_exists
    STDERR.puts("WARNING: interface #{ifname} does not exists, run in dummy mode")
  end
end

Instance Method Details

#current_data ⇒ Object 



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# File 'lib/panopticon/wlan_utilization.rb', line 77

def current_data
  unless @ifname.match(/^wlan\d+$/)
    $log.debug("non-wlan skips utilization acquirement")
    return [0, 0, 0, 0]
  end

  unless @ifname_exists
    $log.warn("interface not available for utilizationm aquirement")
    return [0, 0, 0, 0]
  end

  str = get_survey_dump()
  active = 0
  busy = 0
  channel = 0

  str.split("\n").map{|line| line.strip}.each do |line|
    case line
    when REG_FREQ
      channel = FREQ2CHAN[$1.to_i]
    when REG_ACTIVE
      active = $1.to_i
      active *= 1000 if $2 != "m"
    when REG_BUSY
      busy = $1.to_i
      busy *= 1000 if $2 != "m"
    end
  end
  return [0, 0, 0, 0] if active == 0

  return [channel, active, busy, fto2f(busy.to_f * 100 / active.to_f) ]
end