111 lines
3.3 KiB
Python
111 lines
3.3 KiB
Python
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 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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"""
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Dynamic In-Memory DNS Resolver
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"""
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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 = 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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Method is expected to return DNS response
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"""
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reply = request.reply()
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qname = request.q.qname
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qtype = request.q.qtype
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try:
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if qtype == dnslib.QTYPE.A:
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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.AAAA:
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reply.header.rcode = 0
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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.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, zone=None):
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z = zone or self.zone
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z.add_host(name, ip)
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@synchronized(_lock)
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def remove_host(self, name, ip, zone=None):
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z = zone or self.zone
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z.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=True, udplen=0,
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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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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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self._udp_server = server.DNSServer(self, port=dns_port,
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address=dns_address, logger=logger)
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self._udp_server.start_thread()
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if tcp:
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self._tcp_server = server.DNSServer(self, port=dns_port,
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address=dns_address, tcp=True,
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logger=logger)
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self._tcp_server.start_thread()
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def close(self):
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for srv in [self._tcp_server, self._udp_server]:
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if srv:
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srv.stop()
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srv.server.socket.close()
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def daemon(self, *args, **kwargs):
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test = kwargs.pop('test', False)
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if self._udp_server is None or not self._udp_server.isAlive():
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self.start(*args, **kwargs)
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while self._udp_server.isAlive():
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time.sleep(1)
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if test:
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break
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