text: #!/usr/local/bin/python3
  
  """
      Copyright (c) 2017 Ad Schellevis <ad@opnsense.org>
      Copyright (C) 2017 Fabian Franz
      All rights reserved.
  
      Redistribution and use in source and binary forms, with or without
      modification, are permitted provided that the following conditions are met:
  
      1. Redistributions of source code must retain the above copyright notice,
       this list of conditions and the following disclaimer.
  
      2. Redistributions in binary form must reproduce the above copyright
       notice, this list of conditions and the following disclaimer in the
       documentation and/or other materials provided with the distribution.
  
      THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
      INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
      AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
      AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
      OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
      SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
      INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
      CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
      ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
      POSSIBILITY OF SUCH DAMAGE.
  """
  import os
  import sys
  import re
  import tempfile
  import subprocess
  import argparse
  import json
  
  def unbound_control_reader(action):
      with tempfile.NamedTemporaryFile() as output_stream:
          subprocess.call(['/usr/local/sbin/unbound-control', '-c', '/var/unbound/unbound.conf', action],
                          stdout=output_stream, stderr=open(os.devnull, 'wb'))
          output_stream.seek(0)
          for line in output_stream:
              yield line.decode()
  
  # parse arguments
  parser = argparse.ArgumentParser()
  parser.add_argument('-c', '--cache', help='Dump cache', action="store_true", default=False)
  parser.add_argument('-i', '--infra', help='Dump infrastructure cache', action="store_true", default=False)
  parser.add_argument('-s', '--stats', help='Dump stats', action="store_true", default=False)
  parser.add_argument('-l', '--list-local-zones', help='List local Zones', action="store_true", default=False)
  parser.add_argument('-I', '--list-insecure', help='List Domain-Insecure Zones', action="store_true", default=False)
  parser.add_argument('-d', '--list-local-data', help='List local data', action="store_true", default=False)
  parser.add_argument('-f', '--format', help='output format', action='store', choices=['json'], default='json')
  args = parser.parse_args()
  
  #
  output = None
  if args.cache:
      output = list()
      for line in unbound_control_reader('dump_cache'):
          parts = re.split('^(\S+)\s+(?:([\d]*)\s+)?(IN)\s+(\S+)\s+(.*)$', line)
          if line.find('IN') > -1 and not line.startswith('msg') and len(parts) > 5:
              output.append({'host': parts[1], 'ttl': parts[2], 'type': parts[3], 'rrtype': parts[4], 'value': parts[5]})
  elif args.infra:
      output = list()
      for line in unbound_control_reader('dump_infra'):
          parts = line.split()
          if len(parts) > 2:
              record = {'ip': parts.pop(0), 'host': parts.pop(0)}
              while len(parts) > 0:
                  key = parts.pop(0)
                  if key == 'lame':
                      record['lame'] = True
                      continue
                  record[key] = parts.pop(0)
              output.append(record)
  elif args.stats:
      output = dict()
      for line in unbound_control_reader('stats_noreset'):
          full_key, value = line.split('=')
          keys = full_key.split('.')
          if keys[0] == 'histogram':
              if 'histogram' not in output:
                  output['histogram'] = list()
              output['histogram'].append({
                  'from': (int(keys[1]), int(keys[2])),
                  'to': (int(keys[4]), int(keys[5])),
                  'value': value.strip()
              })
          else:
              ptr = output
              while len(keys) > 0 :
                  key = keys.pop(0)
                  if len(keys) == 0:
                      ptr[key] = value.strip()
                  elif key not in ptr:
                      ptr[key] = dict()
                  elif type(ptr[key]) != dict:
                      ptr[key] = {'__value__': ptr[key]}
                  ptr = ptr[key]
  
  elif args.list_local_zones:
      output = list()
      for line in unbound_control_reader('list_local_zones'):
          parts = line.split()
          if len(parts) >= 2:
              output.append({'zone': parts[0], 'type': parts[1]})
  elif args.list_insecure:
      output = list()
      for line in unbound_control_reader('list_insecure'):
          output.append(line)
  elif args.list_local_data:
      output = list()
      for line in unbound_control_reader('list_local_data'):
          parts = line.split()
          if len(parts) >= 5:
              output.append({'name': parts[0], 'ttl': parts[1], 'type': parts[2], 'rrtype': parts[3], 'value': parts[4]})
  else:
      parser.print_help()
      sys.exit(1)
  
  # flush output
  if args.format == 'json':
      print (json.dumps(output))
  