'''
resmod.py: This example shows how to modify the response from iterator
Copyright (c) 2009, Zdenek Vasicek (vasicek AT fit.vutbr.cz)
Marek Vavrusa (xvavru00 AT stud.fit.vutbr.cz)
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.
* Neither the name of the organization nor the names of its
contributors may be used to endorse or promote products derived from this
software without specific prior written permission.
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.
'''
def init(id, cfg): return True
def deinit(id): return True
def inform_super(id, qstate, superqstate, qdata): return True
def setTTL(qstate, ttl):
"""Updates return_msg TTL and the TTL of all the RRs"""
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 operate(id, event, qstate, qdata):
if (event == MODULE_EVENT_NEW) or (event == MODULE_EVENT_PASS):
#pass the query to validator
qstate.ext_state[id] = MODULE_WAIT_MODULE
return True
if event == MODULE_EVENT_MODDONE:
log_info("pythonmod: iterator module done")
if not qstate.return_msg:
qstate.ext_state[id] = MODULE_FINISHED
return True
#modify the response
qdn = qstate.qinfo.qname_str
if qdn.endswith(".nic.cz."):
#invalidate response in cache added by iterator
#invalidateQueryInCache(qstate, qstate.return_msg.qinfo)
#modify TTL to 10 secs and store response in cache
#setTTL(qstate, 5)
#if not storeQueryInCache(qstate, qstate.return_msg.qinfo, qstate.return_msg.rep, 0):
# qstate.ext_state[id] = MODULE_ERROR
# return False
#modify TTL of response, which will be send to a) validator and then b) client
setTTL(qstate, 10)
qstate.return_rcode = RCODE_NOERROR
qstate.ext_state[id] = MODULE_FINISHED
return True
log_err("pythonmod: bad event")
qstate.ext_state[id] = MODULE_ERROR
return True
