Class: Xlat::Runner

Inherits:
Object
  • Object
show all
Defined in:
lib/xlat/runner.rb

Instance Method Summary collapse

Constructor Details

#initialize(adapter:, translator:, logger: nil) ⇒ Runner

Returns a new instance of Runner.



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# File 'lib/xlat/runner.rb', line 5

def initialize(adapter:, translator:, logger: nil)
  @adapter = adapter
  @translator = translator
  @logger = logger
end

Instance Method Details

#run ⇒ Object 



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# File 'lib/xlat/runner.rb', line 11

def run
  mtu = @adapter.mtu
  buffer = IO::Buffer.new(mtu)
  parser = Protocols::Ip.new

  loop do
    length = @adapter.read(buffer)
    if length < 0
      @logger&.error { "Failed to read packet (errno=#{-length})" }
      next
    end

    pkt = parser.parse(bytes: buffer, bytes_length: length)
    unless pkt
      @logger&.info { "DISCARD: not parsable: #{buffer.slice(0, length).inspect}" }
      next
    end

    case
    when pkt.version == Protocols::Ip::Ipv4
      output = @translator.translate_to_ipv6(pkt, mtu)
    when pkt.version == Protocols::Ip::Ipv6
      output = @translator.translate_to_ipv4(pkt, mtu)
    else
      fail 'unknown IP version'
    end

    unless output
      @logger&.info { "DISCARD: not translatable: #{buffer.slice(0, length).inspect}" }
      next
    end

    @adapter.write(*output)
  rescue
    fail "BUG: #{buffer.slice(0, length).inspect}"
  ensure
    @translator.return_buffer_ownership if output
  end
end