69 lines
1.9 KiB
Python
69 lines
1.9 KiB
Python
#!/usr/bin/env python3
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from zeroconf import Zeroconf, ServiceBrowser, ServiceStateChange
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import sys
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import time
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from twisted.internet import reactor, defer
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from twisted.names import client, dns, error, server
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from twisted.python import log
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domain = sys.argv[1]
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port = int(sys.argv[2])
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class DynamicResolver(object):
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def _dynamicResponseRequired(self, query):
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if str(query.name).endswith(domain):
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return True
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return False
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def _doDynamicResponse(self, query):
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if query.type == dns.SOA:
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return [], [], []
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localname = str(query.name)[:-len(domain)] + "local."
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services = []
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def handler(zeroconf, service_type, name, state_change):
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if state_change is ServiceStateChange.Added:
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services.append(name)
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answers = []
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if query.type == dns.PTR:
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zeroconf = Zeroconf(ip_version=4)
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sb = ServiceBrowser(zeroconf, localname, [handler])
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time.sleep(2) # TODO: non-blocking
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sb.cancel()
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for service in services:
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answers.append(dns.RRHeader(name=query.name.name, type=query.type, payload=dns.Record_PTR(
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name=service[:-6] + domain
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)))
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else:
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# TODO: other types
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print(query)
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return answers, [], []
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def query(self, query, timeout=None):
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if self._dynamicResponseRequired(query):
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return defer.succeed(self._doDynamicResponse(query))
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else:
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return defer.fail(error.DomainError())
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def main():
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factory = server.DNSServerFactory(
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clients=[DynamicResolver()],
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verbose=0
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)
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protocol = dns.DNSDatagramProtocol(controller=factory)
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reactor.listenUDP(port, protocol)
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reactor.listenTCP(port, factory)
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log.startLogging(sys.stdout)
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reactor.run()
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if __name__ == '__main__':
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raise SystemExit(main())
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