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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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@ -33,57 +37,46 @@ 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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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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def _get_fqdn(self, name):
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return utils.get_fqdn(name, self.domain)
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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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self.zone.clear()
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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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@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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@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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(dns_address or "*", dns_port, "UDP/TCP" if tcp else "UDP"))
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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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