1# -*- coding: utf-8 -*- 2''' 3 ubmodule-msg.py: simple response packet logger 4 5 Authors: Zdenek Vasicek (vasicek AT fit.vutbr.cz) 6 Marek Vavrusa (xvavru00 AT stud.fit.vutbr.cz) 7 8 Copyright (c) 2008. All rights reserved. 9 10 This software is open source. 11 12 Redistribution and use in source and binary forms, with or without 13 modification, are permitted provided that the following conditions 14 are met: 15 16 Redistributions of source code must retain the above copyright notice, 17 this list of conditions and the following disclaimer. 18 19 Redistributions in binary form must reproduce the above copyright notice, 20 this list of conditions and the following disclaimer in the documentation 21 and/or other materials provided with the distribution. 22 23 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 24 "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 25 TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 26 PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE 27 LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 28 CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 29 SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 30 INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 31 CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 32 ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 33 POSSIBILITY OF SUCH DAMAGE. 34 35 Modified for unit test by Wouter Wijngaards, NLnet Labs, 2009. 36''' 37import os 38 39def init(id, cfg): 40 log_info("pythonmod: init called, module id is %d port: %d script: %s" % (id, cfg.port, mod_env['script'])) 41 return True 42 43def deinit(id): 44 log_info("pythonmod: deinit called, module id is %d" % id) 45 return True 46 47def inform_super(id, qstate, superqstate, qdata): 48 return True 49 50def setTTL(qstate, ttl): 51 """Sets return_msg TTL and all the RRs TTL""" 52 if qstate.return_msg: 53 qstate.return_msg.rep.ttl = ttl 54 if (qstate.return_msg.rep): 55 for i in range(0,qstate.return_msg.rep.rrset_count): 56 d = qstate.return_msg.rep.rrsets[i].entry.data 57 for j in range(0,d.count+d.rrsig_count): 58 d.rr_ttl[j] = ttl 59 60def dataHex(data, prefix=""): 61 res = "" 62 for i in range(0, int((len(data)+15)/16)): 63 res += "%s0x%02X | " % (prefix, i*16) 64 if type(data[0]) == type(1): 65 d = map(lambda x:int(x), data[i*16:i*16+17]) 66 else: 67 d = map(lambda x:ord(x), data[i*16:i*16+17]) 68 for ch in d: 69 res += "%02X " % ch 70 for i in range(0,17-len(data[i*16:i*16+17])): 71 res += " " 72 res += "| " 73 for ch in d: 74 if (ch < 32) or (ch > 127): 75 res += ". " 76 else: 77 res += "%c " % ch 78 res += "\n" 79 return res 80 81def printReturnMsg(qstate): 82 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)) 83 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) 84 if (qstate.return_msg.rep): 85 print ("RRSets:",qstate.return_msg.rep.rrset_count) 86 prevkey = None 87 for i in range(0,qstate.return_msg.rep.rrset_count): 88 r = qstate.return_msg.rep.rrsets[i] 89 rk = r.rk 90 print (i,":",rk.dname_list, rk.dname_str, "flags: %04X" % rk.flags) 91 print ("type:",rk.type_str,"(%d)" % ntohs(rk.type), "class:",rk.rrset_class_str,"(%d)" % ntohs(rk.rrset_class)) 92 93 d = r.entry.data 94 print (" RRDatas:",d.count+d.rrsig_count) 95 for j in range(0,d.count+d.rrsig_count): 96 print (" ",j,":","TTL=",d.rr_ttl[j],"RR data:") 97 print (dataHex(d.rr_data[j]," ")) 98 99 100def operate(id, event, qstate, qdata): 101 log_info("pythonmod: operate called, id: %d, event:%s" % (id, strmodulevent(event))) 102 #print ("pythonmod: per query data", qdata) 103 104 print ("Query:", qstate.qinfo.qname, qstate.qinfo.qname_list, qstate.qinfo.qname_str) 105 print ("Type:",qstate.qinfo.qtype_str,"(%d)" % qstate.qinfo.qtype) 106 print ("Class:",qstate.qinfo.qclass_str,"(%d)" % qstate.qinfo.qclass) 107 print () 108 109 if (event == MODULE_EVENT_NEW or event == MODULE_EVENT_PASS) and (qstate.qinfo.qname_str.endswith("www2.example.com.")): 110 print (qstate.qinfo.qname_str) 111 112 qstate.ext_state[id] = MODULE_FINISHED 113 114 msg = DNSMessage(qstate.qinfo.qname_str, RR_TYPE_A, RR_CLASS_IN, PKT_QR | PKT_RA | PKT_AA) #, 300) 115 #msg.authority.append("xxx.seznam.cz. 10 IN A 192.168.1.1") 116 #msg.additional.append("yyy.seznam.cz. 10 IN A 1.1.1.2.") 117 118 # answer can be returned to the client without further checking. 119 120 if qstate.qinfo.qtype == RR_TYPE_A: 121 msg.answer.append("%s 10 IN A 192.168.1.1" % qstate.qinfo.qname_str) 122 if (qstate.qinfo.qtype == RR_TYPE_SRV) or (qstate.qinfo.qtype == RR_TYPE_ANY): 123 msg.answer.append("%s 10 IN SRV 0 0 80 neinfo.example.com." % qstate.qinfo.qname_str) 124 if (qstate.qinfo.qtype == RR_TYPE_TXT) or (qstate.qinfo.qtype == RR_TYPE_ANY): 125 msg.answer.append("%s 10 IN TXT path=/" % qstate.qinfo.qname_str) 126 127 print(msg.answer) 128 if not msg.set_return_msg(qstate): 129 qstate.ext_state[id] = MODULE_ERROR 130 return True 131 132 #qstate.return_msg.rep.security = 2 #pokud nebude nasledovat validator, je zapotrebi nastavit security, aby nebyl paket zahozen v mesh_send_reply 133 printReturnMsg(qstate) 134 135 #Authoritative result can't be stored in cache 136 #if (not storeQueryInCache(qstate, qstate.return_msg.qinfo, qstate.return_msg.rep, 0)): 137 # print "Can't store in cache" 138 # qstate.ext_state[id] = MODULE_ERROR 139 # return False 140 #print "Store OK" 141 142 qstate.return_rcode = RCODE_NOERROR 143 return True 144 145 if event == MODULE_EVENT_NEW: 146 qstate.ext_state[id] = MODULE_WAIT_MODULE 147 return True 148 149 if event == MODULE_EVENT_MODDONE: 150 log_info("pythonmod: previous module done") 151 qstate.ext_state[id] = MODULE_FINISHED 152 return True 153 154 if event == MODULE_EVENT_PASS: 155 log_info("pythonmod: event_pass") 156 qstate.ext_state[id] = MODULE_WAIT_MODULE 157 return True 158 159 log_err("pythonmod: BAD event") 160 qstate.ext_state[id] = MODULE_ERROR 161 return True 162 163log_info("pythonmod: script loaded.") 164