Class: Pcapz::Capture

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

Instance Method Summary collapse

Constructor Details

#initialize(interface = Interfacez.default) ⇒ Capture

Returns a new instance of Capture.



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# File 'lib/pcapz/capture.rb', line 3

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

Instance Method Details

#file ⇒ Object 



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# File 'lib/pcapz/capture.rb', line 41

def file
  @file
end

#packets ⇒ Object 



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# File 'lib/pcapz/capture.rb', line 10

def packets
  return nil if @file.closed?
  if block_given?
    loop do
      buffer = @file.read_nonblock(@buffer_size)
      while buffer.size > 0
        datalen = buffer.slice(12,4).unpack('L')[0]
        hdrlen  = buffer.slice(16,2).unpack('v')[0]
        size    = (datalen+hdrlen) + 3 & ~3
        pkt = buffer.slice!(0,size)[hdrlen..-1] 
        yield pkt unless pkt.nil?
      end
    end
  else
    packets = []
    buffer = @file.read_nonblock(@buffer_size)
    while buffer.size > 0
      size, hdrlen = header_decode(buffer)
      pkt = buffer.slice!(0,size)[hdrlen..-1] 
      packets << pkt unless pkt.nil?
    end
    return packets
  end
  return true
rescue EOFError, Errno::EAGAIN
  retry
rescue IO::WaitReadable
  IO.select([@file])
  retry
end

#stop! ⇒ Object 



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# File 'lib/pcapz/capture.rb', line 45

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

#stopped? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/pcapz/capture.rb', line 51

def stopped?
  @file.closed?
end