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, cfg.python_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, (len(data)+15)/16): 63 res += "%s0x%02X | " % (prefix, i*16) 64 d = map(lambda x:ord(x), data[i*16:i*16+17]) 65 for ch in d: 66 res += "%02X " % ch 67 for i in range(0,17-len(d)): 68 res += " " 69 res += "| " 70 for ch in d: 71 if (ch < 32) or (ch > 127): 72 res += ". " 73 else: 74 res += "%c " % ch 75 res += "\n" 76 return res 77 78def printReturnMsg(qstate): 79 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) 80 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 81 if (qstate.return_msg.rep): 82 print "RRSets:",qstate.return_msg.rep.rrset_count 83 prevkey = None 84 for i in range(0,qstate.return_msg.rep.rrset_count): 85 r = qstate.return_msg.rep.rrsets[i] 86 rk = r.rk 87 print i,":",rk.dname_list, rk.dname_str, "flags: %04X" % rk.flags, 88 print "type:",rk.type_str,"(%d)" % ntohs(rk.type), "class:",rk.rrset_class_str,"(%d)" % ntohs(rk.rrset_class) 89 90 d = r.entry.data 91 print " RRDatas:",d.count+d.rrsig_count 92 for j in range(0,d.count+d.rrsig_count): 93 print " ",j,":","TTL=",d.rr_ttl[j],"RR data:" 94 print dataHex(d.rr_data[j]," ") 95 96 97def operate(id, event, qstate, qdata): 98 log_info("pythonmod: operate called, id: %d, event:%s" % (id, strmodulevent(event))) 99 #print "pythonmod: per query data", qdata 100 101 print "Query:", ''.join(map(lambda x:chr(max(32,ord(x))),qstate.qinfo.qname)), qstate.qinfo.qname_list, qstate.qinfo.qname_str, 102 print "Type:",qstate.qinfo.qtype_str,"(%d)" % qstate.qinfo.qtype, 103 print "Class:",qstate.qinfo.qclass_str,"(%d)" % qstate.qinfo.qclass 104 print 105 106 if (event == MODULE_EVENT_NEW or event == MODULE_EVENT_PASS) and (qstate.qinfo.qname_str.endswith("www2.example.com.")): 107 print qstate.qinfo.qname_str 108 109 qstate.ext_state[id] = MODULE_FINISHED 110 111 msg = DNSMessage(qstate.qinfo.qname_str, RR_TYPE_A, RR_CLASS_IN, PKT_QR | PKT_RA | PKT_AA) #, 300) 112 #msg.authority.append("xxx.seznam.cz. 10 IN A 192.168.1.1") 113 #msg.additional.append("yyy.seznam.cz. 10 IN A 1.1.1.2.") 114 115 # answer can be returned to the client without further checking. 116 117 if qstate.qinfo.qtype == RR_TYPE_A: 118 msg.answer.append("%s 10 IN A 192.168.1.1" % qstate.qinfo.qname_str) 119 if (qstate.qinfo.qtype == RR_TYPE_SRV) or (qstate.qinfo.qtype == RR_TYPE_ANY): 120 msg.answer.append("%s 10 IN SRV 0 0 80 neinfo.example.com." % qstate.qinfo.qname_str) 121 if (qstate.qinfo.qtype == RR_TYPE_TXT) or (qstate.qinfo.qtype == RR_TYPE_ANY): 122 msg.answer.append("%s 10 IN TXT path=/" % qstate.qinfo.qname_str) 123 124 if not msg.set_return_msg(qstate): 125 qstate.ext_state[id] = MODULE_ERROR 126 return True 127 128 #qstate.return_msg.rep.security = 2 #pokud nebude nasledovat validator, je zapotrebi nastavit security, aby nebyl paket zahozen v mesh_send_reply 129 printReturnMsg(qstate) 130 131 #Authoritative result can't be stored in cache 132 #if (not storeQueryInCache(qstate, qstate.return_msg.qinfo, qstate.return_msg.rep, 0)): 133 # print "Can't store in cache" 134 # qstate.ext_state[id] = MODULE_ERROR 135 # return False 136 #print "Store OK" 137 138 qstate.return_rcode = RCODE_NOERROR 139 return True 140 141 if event == MODULE_EVENT_NEW: 142 qstate.ext_state[id] = MODULE_WAIT_MODULE 143 return True 144 145 if event == MODULE_EVENT_MODDONE: 146 log_info("pythonmod: previous module done") 147 qstate.ext_state[id] = MODULE_FINISHED 148 return True 149 150 if event == MODULE_EVENT_PASS: 151 log_info("pythonmod: event_pass") 152 qstate.ext_state[id] = MODULE_WAIT_MODULE 153 return True 154 155 log_err("pythonmod: BAD event") 156 qstate.ext_state[id] = MODULE_ERROR 157 return True 158 159log_info("pythonmod: script loaded.") 160