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The C based gRPC (C++, Python, Ruby, Objective-C, PHP, C#)
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74 lines
2.1 KiB
74 lines
2.1 KiB
#!/usr/bin/env python3 |
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# Copyright 2015 gRPC authors. |
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# |
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# Licensed under the Apache License, Version 2.0 (the "License"); |
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# you may not use this file except in compliance with the License. |
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# You may obtain a copy of the License at |
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# |
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# http://www.apache.org/licenses/LICENSE-2.0 |
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# |
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# Unless required by applicable law or agreed to in writing, software |
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# distributed under the License is distributed on an "AS IS" BASIS, |
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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# See the License for the specific language governing permissions and |
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# limitations under the License. |
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"""Makes DNS queries for A records to specified servers""" |
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import argparse |
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import threading |
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import time |
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import twisted.internet.reactor as reactor |
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import twisted.internet.task as task |
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import twisted.names.client as client |
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def main(): |
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argp = argparse.ArgumentParser(description="Make DNS queries for A records") |
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argp.add_argument( |
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"-s", |
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"--server_host", |
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default="127.0.0.1", |
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type=str, |
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help="Host for DNS server to listen on for TCP and UDP.", |
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) |
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argp.add_argument( |
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"-p", |
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"--server_port", |
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default=53, |
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type=int, |
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help="Port that the DNS server is listening on.", |
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) |
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argp.add_argument( |
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"-n", |
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"--qname", |
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default=None, |
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type=str, |
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help="Name of the record to query for. ", |
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) |
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argp.add_argument( |
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"-t", |
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"--timeout", |
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default=1, |
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type=int, |
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help="Force process exit after this number of seconds.", |
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) |
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args = argp.parse_args() |
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def OnResolverResultAvailable(result): |
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answers, authority, additional = result |
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for a in answers: |
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print(a.payload) |
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def BeginQuery(reactor, qname): |
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servers = [(args.server_host, args.server_port)] |
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resolver = client.Resolver(servers=servers) |
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deferred_result = resolver.lookupAddress(args.qname) |
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deferred_result.addCallback(OnResolverResultAvailable) |
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return deferred_result |
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task.react(BeginQuery, [args.qname]) |
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if __name__ == "__main__": |
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main()
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