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# -*- coding: utf-8 -*-
'''
ubmodule-msg.py: simple response packet logger
Authors: Zdenek Vasicek (vasicek AT fit.vutbr.cz)
Marek Vavrusa (xvavru00 AT stud.fit.vutbr.cz)
Copyright (c) 2008. All rights reserved.
This software is open source.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
Redistributions of source code must retain the above copyright notice,
this list of conditions and the following disclaimer.
Redistributions in binary form must reproduce the above copyright notice,
this list of conditions and the following disclaimer in the documentation
and/or other materials provided with the distribution.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE
LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
POSSIBILITY OF SUCH DAMAGE.
Modified for unit test by Wouter Wijngaards, NLnet Labs, 2009.
'''
import os
def init(id, cfg):
log_info("pythonmod: init called, module id is %d port: %d script: %s" % (id, cfg.port, cfg.python_script))
return True
def deinit(id):
log_info("pythonmod: deinit called, module id is %d" % id)
return True
def inform_super(id, qstate, superqstate, qdata):
return True
def setTTL(qstate, ttl):
"""Sets return_msg TTL and all the RRs TTL"""
if qstate.return_msg:
qstate.return_msg.rep.ttl = ttl
if (qstate.return_msg.rep):
for i in range(0,qstate.return_msg.rep.rrset_count):
d = qstate.return_msg.rep.rrsets[i].entry.data
for j in range(0,d.count+d.rrsig_count):
d.rr_ttl[j] = ttl
def dataHex(data, prefix=""):
res = ""
for i in range(0, int((len(data)+15)/16)):
res += "%s0x%02X | " % (prefix, i*16)
if type(data[0]) == type(1):
d = map(lambda x:int(x), data[i*16:i*16+17])
else:
d = map(lambda x:ord(x), data[i*16:i*16+17])
for ch in d:
res += "%02X " % ch
for i in range(0,17-len(data[i*16:i*16+17])):
res += " "
res += "| "
for ch in d:
if (ch < 32) or (ch > 127):
res += ". "
else:
res += "%c " % ch
res += "\n"
return res
def printReturnMsg(qstate):
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))
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)
if (qstate.return_msg.rep):
print ("RRSets:",qstate.return_msg.rep.rrset_count)
prevkey = None
for i in range(0,qstate.return_msg.rep.rrset_count):
r = qstate.return_msg.rep.rrsets[i]
rk = r.rk
print (i,":",rk.dname_list, rk.dname_str, "flags: %04X" % rk.flags)
print ("type:",rk.type_str,"(%d)" % ntohs(rk.type), "class:",rk.rrset_class_str,"(%d)" % ntohs(rk.rrset_class))
d = r.entry.data
print (" RRDatas:",d.count+d.rrsig_count)
for j in range(0,d.count+d.rrsig_count):
print (" ",j,":","TTL=",d.rr_ttl[j],"RR data:")
print (dataHex(d.rr_data[j]," "))
def operate(id, event, qstate, qdata):
log_info("pythonmod: operate called, id: %d, event:%s" % (id, strmodulevent(event)))
#print ("pythonmod: per query data", qdata)
print ("Query:", qstate.qinfo.qname, qstate.qinfo.qname_list, qstate.qinfo.qname_str)
print ("Type:",qstate.qinfo.qtype_str,"(%d)" % qstate.qinfo.qtype)
print ("Class:",qstate.qinfo.qclass_str,"(%d)" % qstate.qinfo.qclass)
print ()
if (event == MODULE_EVENT_NEW or event == MODULE_EVENT_PASS) and (qstate.qinfo.qname_str.endswith("www2.example.com.")):
print (qstate.qinfo.qname_str)
qstate.ext_state[id] = MODULE_FINISHED
msg = DNSMessage(qstate.qinfo.qname_str, RR_TYPE_A, RR_CLASS_IN, PKT_QR | PKT_RA | PKT_AA) #, 300)
#msg.authority.append("xxx.seznam.cz. 10 IN A 192.168.1.1")
#msg.additional.append("yyy.seznam.cz. 10 IN A 1.1.1.2.")
# answer can be returned to the client without further checking.
if qstate.qinfo.qtype == RR_TYPE_A:
msg.answer.append("%s 10 IN A 192.168.1.1" % qstate.qinfo.qname_str)
if (qstate.qinfo.qtype == RR_TYPE_SRV) or (qstate.qinfo.qtype == RR_TYPE_ANY):
msg.answer.append("%s 10 IN SRV 0 0 80 neinfo.example.com." % qstate.qinfo.qname_str)
if (qstate.qinfo.qtype == RR_TYPE_TXT) or (qstate.qinfo.qtype == RR_TYPE_ANY):
msg.answer.append("%s 10 IN TXT path=/" % qstate.qinfo.qname_str)
print(msg.answer)
if not msg.set_return_msg(qstate):
qstate.ext_state[id] = MODULE_ERROR
return True
#qstate.return_msg.rep.security = 2 #pokud nebude nasledovat validator, je zapotrebi nastavit security, aby nebyl paket zahozen v mesh_send_reply
printReturnMsg(qstate)
#Authoritative result can't be stored in cache
#if (not storeQueryInCache(qstate, qstate.return_msg.qinfo, qstate.return_msg.rep, 0)):
# print "Can't store in cache"
# qstate.ext_state[id] = MODULE_ERROR
# return False
#print "Store OK"
qstate.return_rcode = RCODE_NOERROR
return True
if event == MODULE_EVENT_NEW:
qstate.ext_state[id] = MODULE_WAIT_MODULE
return True
if event == MODULE_EVENT_MODDONE:
log_info("pythonmod: previous module done")
qstate.ext_state[id] = MODULE_FINISHED
return True
if event == MODULE_EVENT_PASS:
log_info("pythonmod: event_pass")
qstate.ext_state[id] = MODULE_WAIT_MODULE
return True
log_err("pythonmod: BAD event")
qstate.ext_state[id] = MODULE_ERROR
return True
log_info("pythonmod: script loaded.")
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