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("example.com.")): 107 print qstate.qinfo.qname_str 108 109 qstate.ext_state[id] = MODULE_FINISHED 110 111 # eat time 112 y = 20 113 for z in range(2, 10000): 114 y = y*2 - z/2 115 y = y/2 + z 116 117 msg = DNSMessage(qstate.qinfo.qname_str, RR_TYPE_A, RR_CLASS_IN, PKT_QR | PKT_RA | PKT_AA) #, 300) 118 #msg.authority.append("xxx.seznam.cz. 10 IN A 192.168.1.1") 119 #msg.additional.append("yyy.seznam.cz. 10 IN A 1.1.1.2.") 120 121 # answer can be returned to the client without further checking. 122 123 if qstate.qinfo.qtype == RR_TYPE_A: 124 msg.answer.append("%s 10 IN A 192.168.1.1" % qstate.qinfo.qname_str) 125 if (qstate.qinfo.qtype == RR_TYPE_SRV) or (qstate.qinfo.qtype == RR_TYPE_ANY): 126 msg.answer.append("%s 10 IN SRV 0 0 80 neinfo.example.com." % qstate.qinfo.qname_str) 127 if (qstate.qinfo.qtype == RR_TYPE_TXT) or (qstate.qinfo.qtype == RR_TYPE_ANY): 128 msg.answer.append("%s 10 IN TXT path=/" % qstate.qinfo.qname_str) 129 130 if not msg.set_return_msg(qstate): 131 qstate.ext_state[id] = MODULE_ERROR 132 return True 133 134 #qstate.return_msg.rep.security = 2 #pokud nebude nasledovat validator, je zapotrebi nastavit security, aby nebyl paket zahozen v mesh_send_reply 135 printReturnMsg(qstate) 136 137 #Authoritative result can't be stored in cache 138 #if (not storeQueryInCache(qstate, qstate.return_msg.qinfo, qstate.return_msg.rep, 0)): 139 # print "Can't store in cache" 140 # qstate.ext_state[id] = MODULE_ERROR 141 # return False 142 #print "Store OK" 143 144 qstate.return_rcode = RCODE_NOERROR 145 return True 146 147 if event == MODULE_EVENT_NEW: 148 qstate.ext_state[id] = MODULE_WAIT_MODULE 149 return True 150 151 if event == MODULE_EVENT_MODDONE: 152 log_info("pythonmod: previous module done") 153 qstate.ext_state[id] = MODULE_FINISHED 154 return True 155 156 if event == MODULE_EVENT_PASS: 157 log_info("pythonmod: event_pass") 158 qstate.ext_state[id] = MODULE_WAIT_MODULE 159 return True 160 161 log_err("pythonmod: BAD event") 162 qstate.ext_state[id] = MODULE_ERROR 163 return True 164 165log_info("pythonmod: script loaded.") 166