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2323ea6f07
This cost around 10ms for every Python script, and was only used in one test. Signed-off-by: Douglas Bagnall <douglas.bagnall@catalyst.net.nz> Reviewed-by: Andrew Bartlett <abartlet@samba.org>
97 lines
2.7 KiB
Python
97 lines
2.7 KiB
Python
# Unix SMB/CIFS implementation.
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# Copyright (C) Catalyst.Net Ltd 2016
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# Catalyst.Net's contribution was written by Douglas Bagnall
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# <douglas.bagnall@catalyst.net.nz> and Garming Sam <garming@catalyst.net.nz>
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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#
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# Based on the EchoServer example from python docs
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from __future__ import print_function
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import socketserver as SocketServer
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import sys
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from threading import Timer
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from samba.dcerpc import dns
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import samba.ndr as ndr
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import re
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VERBOSE = False
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def debug(msg):
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if VERBOSE:
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sys.stdout.flush()
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print("\033[00;36m%s\033[00m" % msg)
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sys.stdout.flush()
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timeout = 0
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def answer_question(data, question):
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r = dns.res_rec()
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r.name = question.name
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r.rr_type = dns.DNS_QTYPE_CNAME
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r.rr_class = dns.DNS_QCLASS_IN
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r.ttl = 900
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r.length = 0xffff
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r.rdata = SERVER_ID
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return r
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class DnsHandler(SocketServer.BaseRequestHandler):
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def make_answer(self, data):
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data = ndr.ndr_unpack(dns.name_packet, data)
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debug('answering this question:')
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debug(data.__ndr_print__())
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answer = answer_question(data, data.questions[0])
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if answer is not None:
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data.answers = [answer] * 1
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data.ancount += 1
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debug('the answer was: ')
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debug(data.__ndr_print__())
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data.operation |= dns.DNS_FLAG_REPLY
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return ndr.ndr_pack(data)
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def really_handle(self, data, socket):
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answer = self.make_answer(data)
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socket.sendto(answer, self.client_address)
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def handle(self):
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data, socket = self.request
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debug("%s: %s wrote:" % (SERVER_ID, self.client_address[0]))
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global timeout
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m = re.match(b'^timeout\s+([\d.]+)$', data.strip())
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if m:
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timeout = float(m.group(1))
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debug("timing out at %s" % timeout)
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return
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t = Timer(timeout, self.really_handle, [data, socket])
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t.start()
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def main():
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global SERVER_ID
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host, port, SERVER_ID = sys.argv[1:]
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server = SocketServer.UDPServer((host, int(port)), DnsHandler)
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server.serve_forever()
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main()
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