Class: EventMachine::DNSBL::Server

Inherits:
Connection
  • Object
show all
Defined in:
lib/eventmachine/dnsbl/server.rb

Instance Method Summary collapse

Constructor Details

#initialize(zones = MemoryZone.new) ⇒ Server

Returns a new instance of Server.



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# File 'lib/eventmachine/dnsbl/server.rb', line 7

def initialize(zones = MemoryZone.new)
	@zones = zones
end

Instance Method Details

#add_record(qname, answer, ttl = 300) ⇒ Object 



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# File 'lib/eventmachine/dnsbl/server.rb', line 42

def add_record(qname, answer, ttl=300)
	rr = ResourceRecord.new(qname, ttl, answer)
	@rr[qname] = [] unless @rr[qname]
	@rr[qname] << rr
end

#del_all_records(qname) ⇒ Object 



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# File 'lib/eventmachine/dnsbl/server.rb', line 53

def del_all_records(qname)
	@rr.delete(qname)
end

#del_record(qname, answer) ⇒ Object 



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# File 'lib/eventmachine/dnsbl/server.rb', line 48

def del_record(qname, answer)
	return nil unless @rr[qname]
	@rr[qname].delete_if {|rr| rr.answer == answer}
end

#get_records(qname, qtype) ⇒ Object 



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# File 'lib/eventmachine/dnsbl/server.rb', line 57

def get_records(qname, qtype)
	return nil unless @rr[qname]
	@rr[qname].find_all {|rr| rr.answer.class == qtype}
end

#receive_data(data) ⇒ Object 



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# File 'lib/eventmachine/dnsbl/server.rb', line 11

def receive_data(data)
	dns = Resolv::DNS::Message.decode(data)
	dns.qr = 1
	dns.aa = 1
	return if dns.opcode != Resolv::DNS::OpCode::Query
	unless dns.question.length == 1 and dns.question[0][1] == Resolv::DNS::Resource::IN::A
		dns.rcode = Resolv::DNS::RCode::FormErr
		res = dns.encode
		send_data res
		return
	end
	query, qtype = dns.question[0]
	rs = @zones.get_records(query.to_s, qtype)
	unless rs
		dns.rcode = Resolv::DNS::RCode::NXDomain
		res = dns.encode
		send_data res
		return
	end
	# add the records them to the set of answers
	rs.each do |rr|
		dns.add_answer(query,rr.ttl,rr.answer)
	end
	# Make sure that we are authoritative for the response! Otherwise, return REFUSED
	dns.rcode = Resolv::DNS::RCode::NoError # Or Refused
	res = dns.encode
	#port, ip = Socket.unpack_sockaddr_in(get_peername)
	#puts "DEBUG: #{ip}:#{port} #{res.length}"
	send_data res
end