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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