unbound/pythonmod/examples/resgen.py

   1 '''
   2  resgen.py: This example shows how to generate authoritative response
   3
   4  Copyright (c) 2009, Zdenek Vasicek (vasicek AT fit.vutbr.cz)
   5                      Marek Vavrusa  (xvavru00 AT stud.fit.vutbr.cz)
   6
   7  This software is open source.
   8
   9  Redistribution and use in source and binary forms, with or without
  10  modification, are permitted provided that the following conditions
  11  are met:
  12
  13     * Redistributions of source code must retain the above copyright notice,
  14       this list of conditions and the following disclaimer.
  15
  16     * Redistributions in binary form must reproduce the above copyright notice,
  17       this list of conditions and the following disclaimer in the documentation
  18       and/or other materials provided with the distribution.
  19
  20     * Neither the name of the organization nor the names of its
  21       contributors may be used to endorse or promote products derived from this
  22       software without specific prior written permission.
  23
  24  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  25  "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  26  TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  27  PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE
  28  LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  29  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  30  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  31  INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  32  CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  33  ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  34  POSSIBILITY OF SUCH DAMAGE.
  35 '''
  36 def init(id, cfg): return True
  37
  38 def deinit(id): return True
  39
  40 def inform_super(id, qstate, superqstate, qdata): return True
  41
  42 def operate(id, event, qstate, qdata):
  43     if (event == MODULE_EVENT_NEW) or (event == MODULE_EVENT_PASS):
  44         if (qstate.qinfo.qname_str.endswith(".localdomain.")): #query name ends with localdomain
  45             #create instance of DNS message (packet) with given parameters
  46             msg = DNSMessage(qstate.qinfo.qname_str, RR_TYPE_A, RR_CLASS_IN, PKT_QR | PKT_RA | PKT_AA)
  47             #append RR
  48             if (qstate.qinfo.qtype == RR_TYPE_A) or (qstate.qinfo.qtype == RR_TYPE_ANY):
  49                 msg.answer.append("%s 10 IN A 127.0.0.1" % qstate.qinfo.qname_str)
  50             #set qstate.return_msg
  51             if not msg.set_return_msg(qstate):
  52                 qstate.ext_state[id] = MODULE_ERROR
  53                 return True
  54
  55             #we don't need validation, result is valid
  56             qstate.return_msg.rep.security = 2
  57
  58             qstate.return_rcode = RCODE_NOERROR
  59             qstate.ext_state[id] = MODULE_FINISHED
  60             return True
  61         else:
  62             #pass the query to validator
  63             qstate.ext_state[id] = MODULE_WAIT_MODULE
  64             return True
  65
  66     if event == MODULE_EVENT_MODDONE:
  67         log_info("pythonmod: iterator module done")
  68         qstate.ext_state[id] = MODULE_FINISHED
  69         return True
  70
  71     log_err("pythonmod: bad event")
  72     qstate.ext_state[id] = MODULE_ERROR
  73     return True