1''' 2 resip.py: This example shows how to generate authoritative response 3 and how to find out the IP address of a client 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 38 Usage: 39 40 dig @127.0.0.1 -t TXT what.is.my.ip. 41''' 42 43def init(id, cfg): return True 44 45def deinit(id): return True 46 47def inform_super(id, qstate, superqstate, qdata): return True 48 49def operate(id, event, qstate, qdata): 50 print("Operate {} state: {}".format(event, qstate)) 51 52 # Please note that if this module blocks, by moving to the validator 53 # to validate or iterator to lookup or spawn a subquery to look up, 54 # then, other incoming queries are queued up onto this module and 55 # all of them receive the same reply. 56 # You can inspect the cache. 57 58 if (event == MODULE_EVENT_NEW) or (event == MODULE_EVENT_PASS): 59 if (qstate.qinfo.qname_str.endswith("what.is.my.ip.")): #query name ends with localdomain 60 #create instance of DNS message (packet) with given parameters 61 msg = DNSMessage(qstate.qinfo.qname_str, RR_TYPE_TXT, RR_CLASS_IN, PKT_QR | PKT_RA | PKT_AA) 62 #append RR 63 if (qstate.qinfo.qtype == RR_TYPE_TXT) or (qstate.qinfo.qtype == RR_TYPE_ANY): 64 rl = qstate.mesh_info.reply_list 65 while (rl): 66 if rl.query_reply: 67 q = rl.query_reply 68 # The TTL of 0 is mandatory, otherwise it ends up in 69 # the cache, and is returned to other IP addresses. 70 msg.answer.append("%s 0 IN TXT \"%s %d (%s)\"" % (qstate.qinfo.qname_str, q.addr,q.port,q.family)) 71 rl = rl.next 72 73 #set qstate.return_msg 74 if not msg.set_return_msg(qstate): 75 qstate.ext_state[id] = MODULE_ERROR 76 return True 77 78 #we don't need validation, result is valid 79 qstate.return_msg.rep.security = 2 80 81 qstate.return_rcode = RCODE_NOERROR 82 qstate.ext_state[id] = MODULE_FINISHED 83 return True 84 else: 85 #pass the query to validator 86 qstate.ext_state[id] = MODULE_WAIT_MODULE 87 return True 88 89 if event == MODULE_EVENT_MODDONE: 90 log_info("pythonmod: iterator module done") 91 qstate.ext_state[id] = MODULE_FINISHED 92 return True 93 94 log_err("pythonmod: bad event") 95 qstate.ext_state[id] = MODULE_ERROR 96 return True 97