Home | History | Annotate | Line # | Download | only in examples 
      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 
    122