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, mod_env['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 " % 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("www2.example.com.")):
110        print (qstate.qinfo.qname_str)
111
112        qstate.ext_state[id] = MODULE_FINISHED
113
114        msg = DNSMessage(qstate.qinfo.qname_str, RR_TYPE_A, RR_CLASS_IN, PKT_QR | PKT_RA | PKT_AA) #, 300)
115        #msg.authority.append("xxx.seznam.cz. 10 IN A 192.168.1.1")
116        #msg.additional.append("yyy.seznam.cz. 10 IN A 1.1.1.2.")
117
118	# answer can be returned to the client without further checking.
119
120        if qstate.qinfo.qtype == RR_TYPE_A:
121            msg.answer.append("%s 10 IN A 192.168.1.1" % qstate.qinfo.qname_str)
122        if (qstate.qinfo.qtype == RR_TYPE_SRV) or (qstate.qinfo.qtype == RR_TYPE_ANY):
123            msg.answer.append("%s 10 IN SRV 0 0 80 neinfo.example.com." % qstate.qinfo.qname_str)
124        if (qstate.qinfo.qtype == RR_TYPE_TXT) or (qstate.qinfo.qtype == RR_TYPE_ANY):
125            msg.answer.append("%s 10 IN TXT path=/" % qstate.qinfo.qname_str)
126
127        print(msg.answer)
128        if not msg.set_return_msg(qstate):
129            qstate.ext_state[id] = MODULE_ERROR
130            return True
131
132        #qstate.return_msg.rep.security = 2 #pokud nebude nasledovat validator, je zapotrebi nastavit security, aby nebyl paket zahozen v mesh_send_reply
133        printReturnMsg(qstate)
134
135        #Authoritative result can't be stored in cache
136        #if (not storeQueryInCache(qstate, qstate.return_msg.qinfo, qstate.return_msg.rep, 0)):
137        #    print "Can't store in cache"
138        #    qstate.ext_state[id] = MODULE_ERROR
139        #    return False
140        #print "Store OK"
141
142        qstate.return_rcode = RCODE_NOERROR
143        return True
144
145    if event == MODULE_EVENT_NEW:
146        qstate.ext_state[id] = MODULE_WAIT_MODULE
147        return True
148
149    if event == MODULE_EVENT_MODDONE:
150        log_info("pythonmod: previous module done")
151        qstate.ext_state[id] = MODULE_FINISHED
152        return True
153
154    if event == MODULE_EVENT_PASS:
155        log_info("pythonmod: event_pass")
156        qstate.ext_state[id] = MODULE_WAIT_MODULE
157        return True
158
159    log_err("pythonmod: BAD event")
160    qstate.ext_state[id] = MODULE_ERROR
161    return True
162
163log_info("pythonmod: script loaded.")
164