Class: Async::DNS::GenericHandler

Inherits:
Object
  • Object
show all
Defined in:
lib/async/dns/handler.rb

Overview

A generic handler for DNS queries.

Direct Known Subclasses

DatagramHandler, StreamHandler

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(server, socket) ⇒ GenericHandler

Create a new handler.



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# File 'lib/async/dns/handler.rb', line 25

def initialize(server, socket)
	@server = server
	@socket = socket
end

Instance Attribute Details

#server ⇒ Object (readonly)

Returns the value of attribute server.



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# File 'lib/async/dns/handler.rb', line 31

def server
  @server
end

#socket ⇒ Object (readonly)

Returns the value of attribute socket.



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# File 'lib/async/dns/handler.rb', line 34

def socket
  @socket
end

#The server that will process incoming queries.(serverthatwillprocessincomingqueries.) ⇒ Object (readonly) 



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# File 'lib/async/dns/handler.rb', line 31

attr :server

Instance Method Details

#error_response(query = nil, code = Resolv::DNS::RCode::ServFail) ⇒ Object

Create a new error response.



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# File 'lib/async/dns/handler.rb', line 41

def error_response(query = nil, code = Resolv::DNS::RCode::ServFail)
	# Encoding may fail, so we need to handle this particular case:
	server_failure = Resolv::DNS::Message::new(query ? query.id : 0)
	
	server_failure.qr = 1
	server_failure.opcode = query ? query.opcode : 0
	server_failure.aa = 1
	server_failure.rd = 0
	server_failure.ra = 0

	server_failure.rcode = code

	# We can't do anything at this point...
	return server_failure
end

#process_query(data, **options) ⇒ Object

Process an incoming query.



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# File 'lib/async/dns/handler.rb', line 61

def process_query(data, **options)
	Console.debug "Receiving incoming query (#{data.bytesize} bytes) to #{self.class.name}..."
	
	begin
		query = Resolv::DNS::Message.decode(data)
		
		return @server.process_query(query, **options)
	rescue => error
		Console.error(self, "Failed to process query!", error: error)
		
		return error_response(query)
	end
end

#The socket to read/write data from/to.=(sockettoread/writedatafrom/to. = (value)) ⇒ Object 



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# File 'lib/async/dns/handler.rb', line 34

attr :socket