Class: Panopticon::WlanCapture

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

Constant Summary collapse

CHAN = 
[1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13,
34, 36, 38, 40, 42, 44, 46, 48,
52, 56, 60, 64,
100, 104, 108, 112, 116,
120, 124, 128, 132, 136, 140,
149, 153, 157, 161, 165]
LIMIT_IDX = 
CHAN.length
DEFAULT_IFNAME = 
"wlan0"
DEFAULT_INTERVAL = 
1

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(ifname = DEFAULT_IFNAME, channels = CHAN, interval = DEFAULT_INTERVAL) ⇒ WlanCapture

Returns a new instance of WlanCapture.



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# File 'lib/panopticon/wlan_capture.rb', line 18

def initialize ifname=DEFAULT_IFNAME, channels=CHAN, interval = DEFAULT_INTERVAL
  @th_shark = nil
  @th_capture = nil
  @black_list = []

  @ifname = ifname || DEFAULT_IFNAME
  @channels = channels || CHAN
  @interval = interval || DEFAULT_INTERVAL

  init_status()

  @wlan_utilization = Panopticon::WlanUtilization.new(@ifname)
end

Instance Attribute Details

#channel_walk ⇒ Object (readonly)

Returns the value of attribute channel_walk.



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# File 'lib/panopticon/wlan_capture.rb', line 6

def channel_walk
  @channel_walk
end

#current_channel ⇒ Object (readonly)

Returns the value of attribute current_channel.



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# File 'lib/panopticon/wlan_capture.rb', line 6

def current_channel
  @current_channel
end

#duration ⇒ Object (readonly)

Returns the value of attribute duration.



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# File 'lib/panopticon/wlan_capture.rb', line 6

def duration
  @duration
end

#filesize ⇒ Object (readonly)

Returns the value of attribute filesize.



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# File 'lib/panopticon/wlan_capture.rb', line 6

def filesize
  @filesize
end

#utilization ⇒ Object (readonly)

Returns the value of attribute utilization.



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# File 'lib/panopticon/wlan_capture.rb', line 6

def utilization
  @utilization
end

#utilization_channel ⇒ Object (readonly)

Returns the value of attribute utilization_channel.



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# File 'lib/panopticon/wlan_capture.rb', line 6

def utilization_channel
  @utilization_channel
end

Instance Method Details

#modify_channels(channels) ⇒ Object 



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# File 'lib/panopticon/wlan_capture.rb', line 70

def modify_channels channels
  @channels = channels
end

#run_capture(fpath) ⇒ Object 



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# File 'lib/panopticon/wlan_capture.rb', line 32

def run_capture fpath
  init_device()
  init_status()
  start_time = Time.now.to_i

  stdin, stdout, stderr, @th_tshark = *Open3.popen3(
    "tshark -i #{@ifname} -F pcapng -w #{fpath}")

  while @th_tshark.alive?
    sleep 1

    # update status
    @duration = Time.now.to_i - start_time
    @filesize = File.size?(fpath) || 0

    # do something here to run before channel transition
    ary = @wlan_utilization.current_data()
    @utilization_channel = ary[0]
    @utilization = ary[3]

    prev_channel = @current_channel
    @current_chanenl = move_channel(@current_channel, @channels)
    @channel_walk += 1
    $log.debug("channel moved to #{@current_channel} from #{prev_channel} (dur=#{@duration}, size=#{@filesize}, walk=#{@channel_walk}, utilization=#{@utilization} uch=#{@utilization_channel})")
  end
rescue => e
  $log.warn("run_capture detected unknown error (#{e})")
end

#stop_capture ⇒ Object 



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# File 'lib/panopticon/wlan_capture.rb', line 61

def stop_capture
  if @th_tshark == nil
    $log.err("tried to kill tshark, but it's not executed? (or already dead?)")
    return
  end

  Process.kill("INT", @th_tshark.pid)
end