Class: Pcapz::Capture::BSD

Inherits:
Object
  • Object
show all
Defined in:
lib/pcapz/capture_types/bsd.rb

Instance Method Summary collapse

Constructor Details

#initialize(interface = Interfacez.default) ⇒ BSD

Returns a new instance of BSD.



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# File 'lib/pcapz/capture_types/bsd.rb', line 4

def initialize(interface = Interfacez.default)
  @interface       = interface
  @buffer_size     = 0
  @file            = nil
  @internal_buffer = nil
  configure_bpf_dev
end

Instance Method Details

#file ⇒ Object 



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# File 'lib/pcapz/capture_types/bsd.rb', line 39

def file
  @file
end

#next_packet ⇒ Object 



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# File 'lib/pcapz/capture_types/bsd.rb', line 18

def next_packet
  @internal_buffer.resume
rescue Interrupt
  exit
rescue
  @internal_buffer = Fiber.new do
    loop do
      begin
        buffer = @file.read_nonblock(@buffer_size)
        while buffer.size > 0
          Fiber.yield buffer.slice!(0,(((buffer.slice(12,4).unpack('L')[0])+18) + 3 & ~3))[18..-1] 
        end
      rescue IO::WaitReadable
        IO.select([@file])
        retry
      end
    end
  end
  retry
end

#packets ⇒ Object 



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# File 'lib/pcapz/capture_types/bsd.rb', line 12

def packets
  until @file.closed?
    yield next_packet
  end
end

#stop! ⇒ Object 



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# File 'lib/pcapz/capture_types/bsd.rb', line 43

def stop!
  return nil if stopped?
  @file.close
  stopped?
end

#stopped? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/pcapz/capture_types/bsd.rb', line 49

def stopped?
  @file.closed?
end