tcp-stack-blog

listen_packet.rb

class Listener
  def initialize(conn, config, dst_ip)
    @conn = conn
    @cap = PacketFu::Capture.new(
      iface: config[:iface],
      start: true,
      filter: "tcp and dst #{config[:ip_saddr]} and src #{dst_ip}"
    )
  end

  def listen
    @cap.stream.each do |pkt|
      state = @conn.handle(PacketFu::Packet.parse pkt)
      return if state == Teeceepee::CLOSED_STATE
    end
  end
end