1# -*- coding: utf-8 -*- 2''' 3 ubmodule-tst.py: 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''' 35def init(id, cfg): 36 log_info("pythonmod: init called, module id is %d port: %d script: %s" % (id, cfg.port, cfg.python_script)) 37 return True 38 39def deinit(id): 40 log_info("pythonmod: deinit called, module id is %d" % id) 41 return True 42 43def inform_super(id, qstate, superqstate, qdata): 44 return True 45 46def setTTL(qstate, ttl): 47 """Sets return_msg TTL and all the RRs TTL""" 48 if qstate.return_msg: 49 qstate.return_msg.rep.ttl = ttl 50 if (qstate.return_msg.rep): 51 for i in range(0,qstate.return_msg.rep.rrset_count): 52 d = qstate.return_msg.rep.rrsets[i].entry.data 53 for j in range(0,d.count+d.rrsig_count): 54 d.rr_ttl[j] = ttl 55 56def dataHex(data, prefix=""): 57 res = "" 58 for i in range(0, (len(data)+15)/16): 59 res += "%s0x%02X | " % (prefix, i*16) 60 d = map(lambda x:ord(x), data[i*16:i*16+17]) 61 for ch in d: 62 res += "%02X " % ch 63 for i in range(0,17-len(d)): 64 res += " " 65 res += "| " 66 for ch in d: 67 if (ch < 32) or (ch > 127): 68 res += ". " 69 else: 70 res += "%c " % ch 71 res += "\n" 72 return res 73 74def printReturnMsg(qstate): 75 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) 76 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 77 if (qstate.return_msg.rep): 78 print "RRSets:",qstate.return_msg.rep.rrset_count 79 prevkey = None 80 for i in range(0,qstate.return_msg.rep.rrset_count): 81 r = qstate.return_msg.rep.rrsets[i] 82 rk = r.rk 83 print i,":",rk.dname_list, rk.dname_str, "flags: %04X" % rk.flags, 84 print "type:",rk.type_str,"(%d)" % ntohs(rk.type), "class:",rk.rrset_class_str,"(%d)" % ntohs(rk.rrset_class) 85 86 d = r.entry.data 87 print " RRDatas:",d.count+d.rrsig_count 88 for j in range(0,d.count+d.rrsig_count): 89 print " ",j,":","TTL=",d.rr_ttl[j],"RR data:" 90 print dataHex(d.rr_data[j]," ") 91 92def operate(id, event, qstate, qdata): 93 log_info("pythonmod: operate called, id: %d, event:%s" % (id, strmodulevent(event))) 94 #print "pythonmod: per query data", qdata 95 96 print "Query:", ''.join(map(lambda x:chr(max(32,ord(x))),qstate.qinfo.qname)), qstate.qinfo.qname_list, 97 print "Type:",qstate.qinfo.qtype_str,"(%d)" % qstate.qinfo.qtype, 98 print "Class:",qstate.qinfo.qclass_str,"(%d)" % qstate.qinfo.qclass 99 print 100 101 # TEST: 102 # > dig @127.0.0.1 www.seznam.cz A 103 # > dig @127.0.0.1 3.76.75.77.in-addr.arpa. PTR 104 # prvni dva dotazy vrati TTL 100 105 # > dig @127.0.0.1 www.seznam.cz A 106 # > dig @127.0.0.1 3.76.75.77.in-addr.arpa. PTR 107 # dalsi dva dotazy vrati TTL 10, ktere se bude s dalsimi dotazy snizovat, nez vyprsi a znovu se zaktivuje mesh 108 109 if qstate.return_msg: 110 printReturnMsg(qstate) 111 112 #qdn = '.'.join(qstate.qinfo.qname_list) 113 qdn = qstate.qinfo.qname_str 114 115 #Pokud dotaz konci na nasledujici, pozmenime TTL zpravy, ktera se posle klientovi (return_msg) i zpravy v CACHE 116 if qdn.endswith(".seznam.cz.") or qdn.endswith('.in-addr.arpa.'): 117 #pokud je v cache odpoved z iteratoru, pak ji zneplatnime, jinak se moduly nazavolaji do te doby, nez vyprsi TTL 118 invalidateQueryInCache(qstate, qstate.return_msg.qinfo) 119 120 if (qstate.return_msg.rep.authoritative): 121 print "X"*300 122 123 setTTL(qstate, 10) #do cache nastavime TTL na 10 124 if not storeQueryInCache(qstate, qstate.return_msg.qinfo, qstate.return_msg.rep, 0): 125 qstate.ext_state[id] = MODULE_ERROR 126 return False 127 128 setTTL(qstate, 100) #odpoved klientovi prijde s TTL 100 129 qstate.return_rcode = RCODE_NOERROR 130 131 if event == MODULE_EVENT_NEW: 132 qstate.ext_state[id] = MODULE_WAIT_MODULE 133 return True 134 135 if event == MODULE_EVENT_MODDONE: 136 log_info("pythonmod: previous module done") 137 qstate.ext_state[id] = MODULE_FINISHED 138 return True 139 140 if event == MODULE_EVENT_PASS: 141 log_info("pythonmod: event_pass") 142 qstate.ext_state[id] = MODULE_WAIT_MODULE 143 return True 144 145 log_err("pythonmod: BAD event") 146 qstate.ext_state[id] = MODULE_ERROR 147 return True 148 149log_info("pythonmod: script loaded.") 150