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