unbound/pythonmod/examples/dict.py

   1 # -*- coding: utf-8 -*-
   2 '''
   3  calc.py: DNS-based czech-english dictionary
   4
   5  Copyright (c) 2009, Zdenek Vasicek (vasicek AT fit.vutbr.cz)
   6                      Marek Vavrusa  (xvavru00 AT stud.fit.vutbr.cz)
   7
   8  This software is open source.
   9
  10  Redistribution and use in source and binary forms, with or without
  11  modification, are permitted provided that the following conditions
  12  are met:
  13
  14     * Redistributions of source code must retain the above copyright notice,
  15       this list of conditions and the following disclaimer.
  16
  17     * Redistributions in binary form must reproduce the above copyright notice,
  18       this list of conditions and the following disclaimer in the documentation
  19       and/or other materials provided with the distribution.
  20
  21     * Neither the name of the organization nor the names of its
  22       contributors may be used to endorse or promote products derived from this
  23       software without specific prior written permission.
  24
  25  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  26  "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  27  TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  28  PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE
  29  LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  30  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  31  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  32  INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  33  CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  34  ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  35  POSSIBILITY OF SUCH DAMAGE.
  36 '''
  37 import os
  38 cz_dict = {}
  39 en_dict = {}
  40
  41 def init(id, cfg):
  42    log_info("pythonmod: dict init")
  43    f = open("examples/dict_data.txt", "r")
  44    try:
  45       for line in f:
  46          if line.startswith('#'):
  47             continue
  48          itm = line.split("\t", 3)
  49          if len(itm) < 2:
  50             continue
  51          en,cs = itm[0:2]
  52
  53          if not (cs in cz_dict):
  54             cz_dict[cs] = [en]     # [cs] = en
  55          else:
  56             cz_dict[cs].append(en) # [cs] = en
  57
  58          if not (en in en_dict):
  59             en_dict[en] = [cs]     # [en] = cs
  60          else:
  61             en_dict[en].append(cs) # [en] = cs
  62
  63    finally:
  64       f.close()
  65    return True
  66
  67 def deinit(id):
  68    log_info("pythonmod: dict deinit")
  69    return True
  70
  71 def operate(id, event, qstate, qdata):
  72     if (event == MODULE_EVENT_NEW) or (event == MODULE_EVENT_PASS):
  73
  74        if qstate.qinfo.qname_str.endswith("._dict_.cz."):
  75
  76          aword = ' '.join(qstate.qinfo.qname_list[0:-4])
  77          adict = qstate.qinfo.qname_list[-4]
  78
  79          log_info("pythonmod: dictionary look up; word:%s dict:%s" % (aword,adict))
  80
  81          words = []
  82          if (adict == "en") and (aword in en_dict):
  83             words = en_dict[aword] # EN -> CS
  84          if (adict == "cs") and (aword in cz_dict):
  85             words = cz_dict[aword] # CS -> EN
  86
  87          if len(words) and ((qstate.qinfo.qtype == RR_TYPE_TXT) or (qstate.qinfo.qtype == RR_TYPE_ANY)):
  88
  89             msg = DNSMessage(qstate.qinfo.qname_str, RR_TYPE_TXT, RR_CLASS_IN, PKT_RD | PKT_RA | PKT_AA)
  90             for w in words:
  91                 msg.answer.append("%s 300 IN TXT \"%s\"" % (qstate.qinfo.qname_str,w.replace("\"","\\\"")))
  92
  93             if not msg.set_return_msg(qstate):
  94                qstate.ext_state[id] = MODULE_ERROR
  95                return True
  96
  97             qstate.return_rcode = RCODE_NOERROR
  98             qstate.ext_state[id] = MODULE_FINISHED
  99             return True
 100
 101          else:
 102             qstate.return_rcode = RCODE_SERVFAIL
 103             qstate.ext_state[id] = MODULE_FINISHED
 104             return True
 105
 106        else: #Pass on the unknown query to the iterator
 107          qstate.ext_state[id] = MODULE_WAIT_MODULE
 108          return True
 109
 110     elif event == MODULE_EVENT_MODDONE: #the iterator has finished
 111          #we don't need modify result
 112          qstate.ext_state[id] = MODULE_FINISHED
 113          return True
 114
 115     log_err("pythonmod: Unknown event")
 116     qstate.ext_state[id] = MODULE_ERROR
 117     return True
 118
 119 def inform_super(id, qstate, superqstate, qdata):
 120    return True
 121