resolver: add thread mutex and use new zone module
parent
2c0283fdb7
commit
b735c84a04
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@ -1,14 +1,16 @@
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# -*- coding: utf-8 -*-
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from __future__ import print_function
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import time
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import threading
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import dnslib
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from dnslib import server
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from dnslib import dns
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from IPy import IP
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from wrapt import synchronized
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from onedns import zone
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from onedns import utils
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from onedns import exception
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from onedns.logger import log
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class DynamicResolver(server.BaseResolver):
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@ -16,16 +18,18 @@ class DynamicResolver(server.BaseResolver):
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Dynamic In-Memory DNS Resolver
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"""
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def __init__(self, domain, one_kwargs={}):
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_lock = threading.RLock()
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def __init__(self, domain):
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"""
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Initialise resolver from zone list
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Stores RRs as a list of (label, type, rr) tuples
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"""
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self.domain = domain
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self.zone = []
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self.zone = zone.Zone(domain)
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self._tcp_server = None
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self._udp_server = None
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@synchronized(_lock)
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def resolve(self, request, handler):
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"""
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Respond to DNS request - parameters are request packet & handler.
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@ -33,56 +37,45 @@ class DynamicResolver(server.BaseResolver):
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"""
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reply = request.reply()
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qname = request.q.qname
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qtype = dnslib.QTYPE[request.q.qtype]
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A_RECORDS = ['A', 'AAAA']
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for name, rtype, rr in self.zone:
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# Check if label & type match
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if qname == name and (qtype in [rtype, 'ANY'] or rtype == 'CNAME'):
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reply.add_answer(rr)
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# Check for A/AAAA records associated with reply and
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# add in additional section
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if rtype in ['CNAME', 'NS', 'MX', 'PTR']:
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for a_name, a_rtype, a_rr in self.zone:
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if a_name == rr.rdata.label and a_rtype in A_RECORDS:
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reply.add_ar(a_rr)
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if not reply.rr:
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qtype = request.q.qtype
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try:
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if qtype in (dnslib.QTYPE.A, dnslib.QTYPE.AAAA):
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forward = self.zone.get_forward(qname)
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reply.add_answer(forward)
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elif qtype == dnslib.QTYPE.PTR:
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reverse = self.zone.get_reverse(
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utils.reverse_to_ip(qname.idna()))
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reply.add_answer(reverse)
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forward = self.zone.get_forward(str(reverse.rdata))
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if forward:
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reply.add_ar(forward)
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except exception.RecordDoesNotExist:
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reply.header.rcode = dnslib.RCODE.NXDOMAIN
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return reply
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@synchronized(_lock)
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def clear(self):
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self.zone = []
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self.zone.clear()
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def add_host(self, name, ip, zone=None):
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zone = zone or self.zone
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self._add_forward(name, ip, zone=zone)
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self._add_reverse(ip, name, zone=zone)
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@synchronized(_lock)
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def load(self, zone):
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self.zone = zone
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def _get_fqdn(self, name):
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return utils.get_fqdn(name, self.domain)
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@synchronized(_lock)
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def add_host(self, name, ip):
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self.zone.add_host(name, ip)
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def _add_forward(self, name, ip, zone=None):
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zone = zone or self.zone
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f = dnslib.RR(rname=dnslib.DNSLabel(self._get_fqdn(name)),
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rtype=dnslib.QTYPE.reverse['A'],
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rclass=dnslib.CLASS.reverse['IN'],
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rdata=dns.A(ip))
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zone.append((f.rname, 'A', f))
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def _add_reverse(self, ip, name, zone=None):
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zone = zone or self.zone
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ip = IP(ip)
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r = dnslib.RR(rname=dnslib.DNSLabel(ip.reverseName()),
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rtype=dnslib.QTYPE.reverse['PTR'],
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rclass=dnslib.CLASS.reverse['IN'],
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rdata=dns.PTR(self._get_fqdn(name)))
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zone.append((r.rname, 'PTR', r))
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@synchronized(_lock)
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def remove_host(self, name, ip):
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self.zone.remove_host(name, ip)
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def start(self, dns_address='0.0.0.0', dns_port=53,
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api_address='127.0.0.1', api_port=8000, tcp=False, udplen=0,
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log="request,reply,truncated,error", log_prefix=False):
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logger = server.DNSLogger(log, log_prefix)
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log_components="request,reply,truncated,error",
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log_prefix=False):
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logger = server.DNSLogger(log_components, log_prefix)
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print("Starting OneDNS (%s:%d) [%s]" %
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log.info("Starting OneDNS (%s:%d) [%s]" %
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(dns_address or "*", dns_port, "UDP/TCP" if tcp else "UDP"))
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server.DNSHandler.udplen = udplen
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@ -3,7 +3,6 @@ import dnslib
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from IPy import IP
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from onedns import zone
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from onedns import server
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from onedns import resolver
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from onedns.tests import vcr
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from onedns.clients import one
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@ -30,6 +29,7 @@ TEST_GET_FORWARD_DATA = [
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HOST + '.',
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]
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@pytest.fixture(scope="function")
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def dns(request):
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dns = resolver.DynamicResolver(domain=DOMAIN)
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@ -1,14 +1,22 @@
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import pytest
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import dnslib
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from IPy import IP
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from onedns import zone
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from onedns.tests import utils
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from onedns.tests import conftest
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def _clear_and_add_test_host(dns, name, ip):
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dns.clear()
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dns.add_host(name, ip)
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@pytest.mark.parametrize("qname,qtype,output", conftest.TEST_LOOKUP_DATA)
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def test_lookup(dns, qname, qtype, output):
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dns.clear()
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dns.add_host(conftest.HOST, conftest.HOST_IP)
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_clear_and_add_test_host(dns, conftest.HOST, conftest.HOST_IP)
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try:
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a = utils.dnsquery(qname, qtype)
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assert a.short() == output
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@ -25,15 +33,35 @@ def test_nxdomain(dns):
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dns.close()
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@pytest.mark.parametrize("name,ip", conftest.TEST_GET_FQDN_DATA)
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def test_get_fqdn(dns, name, ip):
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dns.clear()
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dns.add_host(name, ip)
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assert dns.zone[0][0].label[0] == name.split('.')[0]
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assert '.'.join(dns.zone[0][0].label[1:]) == conftest.DOMAIN
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def test_daemon(dns):
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dns.close()
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dns.daemon(dns_address=conftest.INTERFACE, dns_port=conftest.PORT,
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tcp=True, testing=True)
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@pytest.mark.parametrize("qname,qtype,output", conftest.TEST_LOOKUP_DATA)
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def test_remove_host(dns, qname, qtype, output):
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_clear_and_add_test_host(dns, conftest.HOST, conftest.HOST_IP)
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try:
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a = utils.dnsquery(qname, qtype)
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assert a.short() == output
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dns.remove_host(conftest.HOST, conftest.HOST_IP)
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a = utils.dnsquery(qname, qtype)
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assert dnslib.RCODE.get(a.header.rcode) == 'NXDOMAIN'
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finally:
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dns.close()
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def test_load_zone(dns):
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new_ip = IP(IP(conftest.HOST_IP).int() + 1)
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new_zone = zone.Zone(conftest.DOMAIN)
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new_zone.add_host(conftest.HOST, new_ip)
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_clear_and_add_test_host(dns, conftest.HOST, conftest.HOST_IP)
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try:
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a = utils.dnsquery(conftest.HOST, dnslib.QTYPE.A)
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assert a.short() == conftest.HOST_IP
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dns.load(new_zone)
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a = utils.dnsquery(conftest.HOST, dnslib.QTYPE.A)
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assert a.short() == str(new_ip)
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finally:
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dns.close()
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@ -1,7 +1,12 @@
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import os
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import dns.name
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import dns.reversename
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import dnslib
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from IPy import IP
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from onedns.logger import log
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@ -14,6 +19,11 @@ def get_fqdn(name, domain):
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return name.idna()
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def reverse_to_ip(reverse):
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rname = dns.name.Name(reverse.split('.'))
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return IP(dns.reversename.to_address(rname))
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def get_kwargs_from_dict(d, prefix, lower=False):
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tups_list = []
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for i in d:
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@ -1,3 +1,5 @@
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oca==4.10.0
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IPy==0.83
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dnslib==0.9.6
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dnspython==1.14.0
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wrapt==1.10.8
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