# -*- coding: utf-8 -*- ''' ubmodule-msg.py: simple response packet logger Authors: Zdenek Vasicek (vasicek AT fit.vutbr.cz) Marek Vavrusa (xvavru00 AT stud.fit.vutbr.cz) Copyright (c) 2008. All rights reserved. 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. 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. Modified for unit test by Wouter Wijngaards, NLnet Labs, 2009. ''' import os def init(id, cfg): log_info("pythonmod: init called, module id is %d port: %d script: %s" % (id, cfg.port, mod_env['script'])) return True def deinit(id): log_info("pythonmod: deinit called, module id is %d" % id) return True def inform_super(id, qstate, superqstate, qdata): return True def setTTL(qstate, ttl): """Sets return_msg TTL and all the RRs TTL""" if qstate.return_msg: qstate.return_msg.rep.ttl = ttl if (qstate.return_msg.rep): for i in range(0,qstate.return_msg.rep.rrset_count): d = qstate.return_msg.rep.rrsets[i].entry.data for j in range(0,d.count+d.rrsig_count): d.rr_ttl[j] = ttl def dataHex(data, prefix=""): res = "" for i in range(0, int((len(data)+15)/16)): res += "%s0x%02X | " % (prefix, i*16) if type(data[0]) == type(1): d = map(lambda x:int(x), data[i*16:i*16+17]) else: d = map(lambda x:ord(x), data[i*16:i*16+17]) for ch in d: res += "%02X " % ch for i in range(0,17-len(data[i*16:i*16+17])): res += " " res += "| " for ch in d: if (ch < 32) or (ch > 127): res += ". " else: res += "%c " % ch res += "\n" return res def printReturnMsg(qstate): print ("Return MSG rep :: flags: %04X, QDcount: %d, Security:%d, TTL=%d" % (qstate.return_msg.rep.flags, qstate.return_msg.rep.qdcount, qstate.return_msg.rep.security, qstate.return_msg.rep.ttl)) print (" qinfo :: qname:",qstate.return_msg.qinfo.qname_list, qstate.return_msg.qinfo.qname_str, "type:",qstate.return_msg.qinfo.qtype_str, "class:",qstate.return_msg.qinfo.qclass_str) if (qstate.return_msg.rep): print ("RRSets:",qstate.return_msg.rep.rrset_count) prevkey = None for i in range(0,qstate.return_msg.rep.rrset_count): r = qstate.return_msg.rep.rrsets[i] rk = r.rk print (i,":",rk.dname_list, rk.dname_str, "flags: %04X" % rk.flags) print ("type:",rk.type_str,"(%d)" % ntohs(rk.type), "class:",rk.rrset_class_str,"(%d)" % ntohs(rk.rrset_class)) d = r.entry.data print (" RRDatas:",d.count+d.rrsig_count) for j in range(0,d.count+d.rrsig_count): print (" ",j,":","TTL=",d.rr_ttl[j],"RR data:") print (dataHex(d.rr_data[j]," ")) def operate(id, event, qstate, qdata): log_info("pythonmod: operate called, id: %d, event:%s" % (id, strmodulevent(event))) #print ("pythonmod: per query data", qdata) print ("Query:", qstate.qinfo.qname, qstate.qinfo.qname_list, qstate.qinfo.qname_str) print ("Type:",qstate.qinfo.qtype_str,"(%d)" % qstate.qinfo.qtype) print ("Class:",qstate.qinfo.qclass_str,"(%d)" % qstate.qinfo.qclass) print () if (event == MODULE_EVENT_NEW or event == MODULE_EVENT_PASS) and (qstate.qinfo.qname_str.endswith("www2.example.com.")): print (qstate.qinfo.qname_str) qstate.ext_state[id] = MODULE_FINISHED msg = DNSMessage(qstate.qinfo.qname_str, RR_TYPE_A, RR_CLASS_IN, PKT_QR | PKT_RA | PKT_AA) #, 300) #msg.authority.append("xxx.seznam.cz. 10 IN A 192.168.1.1") #msg.additional.append("yyy.seznam.cz. 10 IN A 1.1.1.2.") # answer can be returned to the client without further checking. if qstate.qinfo.qtype == RR_TYPE_A: msg.answer.append("%s 10 IN A 192.168.1.1" % qstate.qinfo.qname_str) if (qstate.qinfo.qtype == RR_TYPE_SRV) or (qstate.qinfo.qtype == RR_TYPE_ANY): msg.answer.append("%s 10 IN SRV 0 0 80 neinfo.example.com." % qstate.qinfo.qname_str) if (qstate.qinfo.qtype == RR_TYPE_TXT) or (qstate.qinfo.qtype == RR_TYPE_ANY): msg.answer.append("%s 10 IN TXT path=/" % qstate.qinfo.qname_str) print(msg.answer) if not msg.set_return_msg(qstate): qstate.ext_state[id] = MODULE_ERROR return True #qstate.return_msg.rep.security = 2 #pokud nebude nasledovat validator, je zapotrebi nastavit security, aby nebyl paket zahozen v mesh_send_reply printReturnMsg(qstate) #Authoritative result can't be stored in cache #if (not storeQueryInCache(qstate, qstate.return_msg.qinfo, qstate.return_msg.rep, 0)): # print "Can't store in cache" # qstate.ext_state[id] = MODULE_ERROR # return False #print "Store OK" qstate.return_rcode = RCODE_NOERROR return True if event == MODULE_EVENT_NEW: qstate.ext_state[id] = MODULE_WAIT_MODULE return True if event == MODULE_EVENT_MODDONE: log_info("pythonmod: previous module done") qstate.ext_state[id] = MODULE_FINISHED return True if event == MODULE_EVENT_PASS: log_info("pythonmod: event_pass") qstate.ext_state[id] = MODULE_WAIT_MODULE return True log_err("pythonmod: BAD event") qstate.ext_state[id] = MODULE_ERROR return True log_info("pythonmod: script loaded.")