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# -*- coding: utf-8 -*-
'''
 calc.py: DNS-based calculator

Copyright (c) 2009, Zdenek Vasicek (vasicek AT fit.vutbr.cz)
                     Marek Vavrusa  (xvavru00 AT stud.fit.vutbr.cz)

This software is open source.
 
 Redistribution and use in source and binary forms, with or without
 modification, are permitted provided that the following conditions
 are met:
 
    * Redistributions of source code must retain the above copyright notice,
      this list of conditions and the following disclaimer.
 
    * 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.
 
    * Neither the name of the organization nor the names of its
      contributors may be used to endorse or promote products derived from this
      software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 "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 REGENTS OR CONTRIBUTORS 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.
'''

#Try: dig @localhost 1*25._calc_.cz.

def init(id, cfg): return True
def deinit(id): return True
def inform_super(id, qstate, superqstate, qdata): return True

def operate(id, event, qstate, qdata):

if (event == MODULE_EVENT_NEW) or (event == MODULE_EVENT_PASS):

if qstate.qinfo.qname_str.endswith("._calc_.cz.") and not ("__" in qstate.qinfo.qname_str):
            try:
                # the second and third argument to eval attempt to restrict
                # functions and variables available to stop code execution
                # but it may not be safe either.  This is why __ substrings
                # are excluded from evaluation.
                res = eval(''.join(qstate.qinfo.qname_list[0:-3]),{"__builtins__":None},{})
            except:
                res = "exception"

msg = DNSMessage(qstate.qinfo.qname_str, RR_TYPE_TXT, RR_CLASS_IN, PKT_QR | PKT_RA | PKT_AA) #, 300)
            msg.answer.append("%s 300 IN TXT \"%s\"" % (qstate.qinfo.qname_str,res))
            if not msg.set_return_msg(qstate):
               qstate.ext_state[id] = MODULE_ERROR 
               return True

qstate.return_rcode = RCODE_NOERROR
            qstate.ext_state[id] = MODULE_FINISHED 
            return True

else: 
            #Pass on the unknown query to the iterator
            qstate.ext_state[id] = MODULE_WAIT_MODULE 
            return True

elif event == MODULE_EVENT_MODDONE: 
        #the iterator has finished
        qstate.ext_state[id] = MODULE_FINISHED
        return True

log_err("pythonmod: Unknown event")
    qstate.ext_state[id] = MODULE_ERROR
    return True

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