Class: ZeroConf::Service

Inherits:
Object
  • Object
show all
Includes:
Utils
Defined in:
lib/zeroconf/service.rb

Constant Summary

Constants included from Utils

Utils::BROADCAST_V4, Utils::BROADCAST_V6, Utils::DISCOVERY_NAME

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods included from Utils

#broadcast_v4, #broadcast_v6, #multicast_send, #open_ipv4, #open_ipv6, #unicast_send

Constructor Details

#initialize(service, service_port, hostname = Socket.gethostname, service_interfaces: ZeroConf.service_interfaces, text: [""], abort_on_malformed_requests: false, started_callback: nil) ⇒ Service

Returns a new instance of Service.



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# File 'lib/zeroconf/service.rb', line 12

def initialize service, service_port, hostname = Socket.gethostname, service_interfaces: ZeroConf.service_interfaces, text: [""], abort_on_malformed_requests: false, started_callback: nil
  @service = service
  @service_port = service_port
  @hostname = hostname
  @service_interfaces = service_interfaces
  @abort_on_malformed_requests = abort_on_malformed_requests
  @service_name = "#{hostname}.#{service}"
  @qualified_host = "#{hostname}.local."
  @started_callback = started_callback
  @text = text
  @started = false
  @rd, @wr = IO.pipe
end

Instance Attribute Details

#abort_on_malformed_requests ⇒ Object (readonly)

Returns the value of attribute abort_on_malformed_requests.



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# File 'lib/zeroconf/service.rb', line 9

def abort_on_malformed_requests
  @abort_on_malformed_requests
end

#hostname ⇒ Object (readonly)

Returns the value of attribute hostname.



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# File 'lib/zeroconf/service.rb', line 9

def hostname
  @hostname
end

#qualified_host ⇒ Object (readonly)

Returns the value of attribute qualified_host.



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# File 'lib/zeroconf/service.rb', line 9

def qualified_host
  @qualified_host
end

#service ⇒ Object (readonly)

Returns the value of attribute service.



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# File 'lib/zeroconf/service.rb', line 9

def service
  @service
end

#service_interfaces ⇒ Object (readonly)

Returns the value of attribute service_interfaces.



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# File 'lib/zeroconf/service.rb', line 9

def service_interfaces
  @service_interfaces
end

#service_name ⇒ Object (readonly)

Returns the value of attribute service_name.



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# File 'lib/zeroconf/service.rb', line 9

def service_name
  @service_name
end

#service_port ⇒ Object (readonly)

Returns the value of attribute service_port.



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# File 'lib/zeroconf/service.rb', line 9

def service_port
  @service_port
end

#text ⇒ Object (readonly)

Returns the value of attribute text.



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# File 'lib/zeroconf/service.rb', line 9

def text
  @text
end

Instance Method Details

#announcement ⇒ Object 



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# File 'lib/zeroconf/service.rb', line 28

def announcement
  msg = Resolv::DNS::Message.new(0)
  msg.qr = 1
  msg.aa = 1

  msg.add_additional service_name, 60, MDNS::Announce::IN::SRV.new(0, 0, service_port, qualified_host)

  service_interfaces.each do |iface|
    if iface.addr.ipv4?
      msg.add_additional qualified_host,
        60,
        MDNS::Announce::IN::A.new(iface.addr.ip_address)
    else
      msg.add_additional qualified_host,
        60,
        MDNS::Announce::IN::AAAA.new(iface.addr.ip_address)
    end
  end

  if @text
    msg.add_additional service_name,
      60,
      MDNS::Announce::IN::TXT.new(*@text)
  end

  msg.add_answer service,
    60,
    Resolv::DNS::Resource::IN::PTR.new(Resolv::DNS::Name.create(service_name))

  msg
end

#disconnect_msg ⇒ Object 



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# File 'lib/zeroconf/service.rb', line 60

def disconnect_msg
  msg = Resolv::DNS::Message.new(0)
  msg.qr = 1
  msg.aa = 1

  msg.add_additional service_name, 0, Resolv::DNS::Resource::IN::SRV.new(0, 0, service_port, qualified_host)

  service_interfaces.each do |iface|
    if iface.addr.ipv4?
      msg.add_additional qualified_host,
        0,
        Resolv::DNS::Resource::IN::A.new(iface.addr.ip_address)
    else
      msg.add_additional qualified_host,
        0,
        Resolv::DNS::Resource::IN::AAAA.new(iface.addr.ip_address)
    end
  end

  if @text
    msg.add_additional service_name,
      0,
      Resolv::DNS::Resource::IN::TXT.new(*@text)
  end

  msg.add_answer service,
    0,
    Resolv::DNS::Resource::IN::PTR.new(Resolv::DNS::Name.create(service_name))

  msg
end

#start ⇒ Object 



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# File 'lib/zeroconf/service.rb', line 99

def start
  sock = open_ipv4 Addrinfo.new(Socket.sockaddr_in(Resolv::MDNS::Port, Socket::INADDR_ANY)), Resolv::MDNS::Port

  sockets = [sock, @rd]

  msg = announcement

  # announce
  multicast_send(sock, msg.encode)

  @started = true
  @started_callback&.call

  loop do
    readers, = IO.select(sockets, [], [])
    next unless readers

    readers.each do |reader|
      if reader == @rd
        @rd.close
        return
      end

      buf, from = reader.recvfrom 2048
      msg = begin
        Resolv::DNS::Message.decode(buf)
      rescue Resolv::DNS::DecodeError
        next unless abort_on_malformed_requests
        @rd.close
        stop
        raise
      end

      has_flags = (buf.getbyte(3) << 8 | buf.getbyte(2)) != 0

      msg.question.each do |name, type|
        class_type = type::ClassValue & ~MDNS_CACHE_FLUSH

        break unless class_type == 1 || class_type == 255

        unicast = type::ClassValue & PTR::MDNS_UNICAST_RESPONSE > 0

        qn = name.to_s + "."

        res = case qn
        when DISCOVERY_NAME
          break if has_flags

          if unicast
            dnssd_unicast_answer
          else
            dnssd_multicast_answer
          end
        when service
          if unicast
            service_unicast_answer
          else
            service_multicast_answer
          end
        when service_name
          if unicast
            service_instance_unicast_answer
          else
            service_instance_multicast_answer
          end
        when qualified_host
          if unicast
            name_answer_unicast
          else
            name_answer_multicast
          end
        else
          #p [:QUERY2, type, type::ClassValue, name]
        end

        next unless res

        if unicast
          unicast_send reader, res.encode, from
        else
          multicast_send reader, res.encode
        end
      end

      # only yield replies to this question
    end
  end
ensure
  multicast_send(sock, disconnect_msg.encode) if sock
  sockets.map(&:close) if sockets
end

#started? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/zeroconf/service.rb', line 26

def started?; @started; end

#stop ⇒ Object 



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# File 'lib/zeroconf/service.rb', line 92

def stop
  return unless @started
  @wr.write "x"
  @wr.close
  @started = false
end