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''' 35import os 36 37def init(id, cfg): 38 log_info("pythonmod: init called, module id is %d port: %d script: %s" % (id, cfg.port, cfg.python_script)) 39 return True 40 41def deinit(id): 42 log_info("pythonmod: deinit called, module id is %d" % id) 43 return True 44 45def inform_super(id, qstate, superqstate, qdata): 46 return True 47 48def setTTL(qstate, ttl): 49 """Sets return_msg TTL and all the RRs TTL""" 50 if qstate.return_msg: 51 qstate.return_msg.rep.ttl = ttl 52 if (qstate.return_msg.rep): 53 for i in range(0,qstate.return_msg.rep.rrset_count): 54 d = qstate.return_msg.rep.rrsets[i].entry.data 55 for j in range(0,d.count+d.rrsig_count): 56 d.rr_ttl[j] = ttl 57 58def dataHex(data, prefix=""): 59 res = "" 60 for i in range(0, (len(data)+15)/16): 61 res += "%s0x%02X | " % (prefix, i*16) 62 d = map(lambda x:ord(x), data[i*16:i*16+17]) 63 for ch in d: 64 res += "%02X " % ch 65 for i in range(0,17-len(d)): 66 res += " " 67 res += "| " 68 for ch in d: 69 if (ch < 32) or (ch > 127): 70 res += ". " 71 else: 72 res += "%c " % ch 73 res += "\n" 74 return res 75 76def printReturnMsg(qstate): 77 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) 78 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 79 if (qstate.return_msg.rep): 80 print "RRSets:",qstate.return_msg.rep.rrset_count 81 prevkey = None 82 for i in range(0,qstate.return_msg.rep.rrset_count): 83 r = qstate.return_msg.rep.rrsets[i] 84 rk = r.rk 85 print i,":",rk.dname_list, rk.dname_str, "flags: %04X" % rk.flags, 86 print "type:",rk.type_str,"(%d)" % ntohs(rk.type), "class:",rk.rrset_class_str,"(%d)" % ntohs(rk.rrset_class) 87 88 d = r.entry.data 89 print " RRDatas:",d.count+d.rrsig_count 90 for j in range(0,d.count+d.rrsig_count): 91 print " ",j,":","TTL=",d.rr_ttl[j],"RR data:" 92 print dataHex(d.rr_data[j]," ") 93 94 95def operate(id, event, qstate, qdata): 96 log_info("pythonmod: operate called, id: %d, event:%s" % (id, strmodulevent(event))) 97 #print "pythonmod: per query data", qdata 98 99 print "Query:", ''.join(map(lambda x:chr(max(32,ord(x))),qstate.qinfo.qname)), qstate.qinfo.qname_list, qstate.qinfo.qname_str, 100 print "Type:",qstate.qinfo.qtype_str,"(%d)" % qstate.qinfo.qtype, 101 print "Class:",qstate.qinfo.qclass_str,"(%d)" % qstate.qinfo.qclass 102 print 103 104 #if event == MODULE_EVENT_PASS: #pokud mame "validator python iterator" 105 if (event == MODULE_EVENT_NEW) and (qstate.qinfo.qname_str.endswith(".seznam.cz.")): #pokud mame "python validator iterator" 106 print qstate.qinfo.qname_str 107 108 qstate.ext_state[id] = MODULE_FINISHED 109 110 msg = DNSMessage(qstate.qinfo.qname_str, RR_TYPE_A, RR_CLASS_IN, PKT_QR | PKT_RA | PKT_AA) #, 300) 111 #msg.authority.append("xxx.seznam.cz. 10 IN A 192.168.1.1") 112 #msg.additional.append("yyy.seznam.cz. 10 IN A 1.1.1.2.") 113 114 if qstate.qinfo.qtype == RR_TYPE_A: 115 msg.answer.append("%s 10 IN A 192.168.1.1" % qstate.qinfo.qname_str) 116 if (qstate.qinfo.qtype == RR_TYPE_SRV) or (qstate.qinfo.qtype == RR_TYPE_ANY): 117 msg.answer.append("%s 10 IN SRV 0 0 80 neinfo.example.com." % qstate.qinfo.qname_str) 118 if (qstate.qinfo.qtype == RR_TYPE_TXT) or (qstate.qinfo.qtype == RR_TYPE_ANY): 119 msg.answer.append("%s 10 IN TXT path=/" % qstate.qinfo.qname_str) 120 121 if not msg.set_return_msg(qstate): 122 qstate.ext_state[id] = MODULE_ERROR 123 return True 124 125 #qstate.return_msg.rep.security = 2 #pokud nebude nasledovat validator, je zapotrebi nastavit security, aby nebyl paket zahozen v mesh_send_reply 126 printReturnMsg(qstate) 127 128 #Authoritative result can't be stored in cache 129 #if (not storeQueryInCache(qstate, qstate.return_msg.qinfo, qstate.return_msg.rep, 0)): 130 # print "Can't store in cache" 131 # qstate.ext_state[id] = MODULE_ERROR 132 # return False 133 #print "Store OK" 134 135 qstate.return_rcode = RCODE_NOERROR 136 return True 137 138 if event == MODULE_EVENT_NEW: 139 qstate.ext_state[id] = MODULE_WAIT_MODULE 140 return True 141 142 if event == MODULE_EVENT_MODDONE: 143 log_info("pythonmod: previous module done") 144 qstate.ext_state[id] = MODULE_FINISHED 145 return True 146 147 if event == MODULE_EVENT_PASS: 148 log_info("pythonmod: event_pass") 149 qstate.ext_state[id] = MODULE_WAIT_MODULE 150 return True 151 152 log_err("pythonmod: BAD event") 153 qstate.ext_state[id] = MODULE_ERROR 154 return True 155 156log_info("pythonmod: script loaded.") 157