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, 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 " % int(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("example.com.")): 110 print (qstate.qinfo.qname_str) 111 112 qstate.ext_state[id] = MODULE_FINISHED 113 114 # eat time 115 y = 20 116 for z in range(2, 10000): 117 y = y*2 - z/2 118 y = y/2 + z 119 120 msg = DNSMessage(qstate.qinfo.qname_str, RR_TYPE_A, RR_CLASS_IN, PKT_QR | PKT_RA | PKT_AA) #, 300) 121 #msg.authority.append("xxx.seznam.cz. 10 IN A 192.168.1.1") 122 #msg.additional.append("yyy.seznam.cz. 10 IN A 1.1.1.2.") 123 124 # answer can be returned to the client without further checking. 125 126 if qstate.qinfo.qtype == RR_TYPE_A: 127 msg.answer.append("%s 10 IN A 192.168.1.1" % qstate.qinfo.qname_str) 128 if (qstate.qinfo.qtype == RR_TYPE_SRV) or (qstate.qinfo.qtype == RR_TYPE_ANY): 129 msg.answer.append("%s 10 IN SRV 0 0 80 neinfo.example.com." % qstate.qinfo.qname_str) 130 if (qstate.qinfo.qtype == RR_TYPE_TXT) or (qstate.qinfo.qtype == RR_TYPE_ANY): 131 msg.answer.append("%s 10 IN TXT path=/" % qstate.qinfo.qname_str) 132 133 if not msg.set_return_msg(qstate): 134 qstate.ext_state[id] = MODULE_ERROR 135 return True 136 137 #qstate.return_msg.rep.security = 2 #pokud nebude nasledovat validator, je zapotrebi nastavit security, aby nebyl paket zahozen v mesh_send_reply 138 printReturnMsg(qstate) 139 140 #Authoritative result can't be stored in cache 141 #if (not storeQueryInCache(qstate, qstate.return_msg.qinfo, qstate.return_msg.rep, 0)): 142 # print "Can't store in cache" 143 # qstate.ext_state[id] = MODULE_ERROR 144 # return False 145 #print "Store OK" 146 147 qstate.return_rcode = RCODE_NOERROR 148 return True 149 150 if event == MODULE_EVENT_NEW: 151 qstate.ext_state[id] = MODULE_WAIT_MODULE 152 return True 153 154 if event == MODULE_EVENT_MODDONE: 155 log_info("pythonmod: previous module done") 156 qstate.ext_state[id] = MODULE_FINISHED 157 return True 158 159 if event == MODULE_EVENT_PASS: 160 log_info("pythonmod: event_pass") 161 qstate.ext_state[id] = MODULE_WAIT_MODULE 162 return True 163 164 log_err("pythonmod: BAD event") 165 qstate.ext_state[id] = MODULE_ERROR 166 return True 167 168log_info("pythonmod: script loaded.") 169