mirror of https://github.com/grpc/grpc.git
The C based gRPC (C++, Python, Ruby, Objective-C, PHP, C#)
https://grpc.io/
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49 lines
1.9 KiB
49 lines
1.9 KiB
7 years ago
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#!/usr/bin/env python2.7
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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 signal
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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('-s', '--server_host', default='127.0.0.1', type=str,
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help='Host for DNS server to listen on for TCP and UDP.')
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argp.add_argument('-p', '--server_port', default=53, type=int,
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help='Port that the DNS server is listening on.')
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argp.add_argument('-n', '--qname', default=None, type=str,
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help=('Name of the record to query for. '))
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argp.add_argument('-t', '--timeout', default=1, type=int,
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help=('Force process exit after this number of seconds.'))
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args = argp.parse_args()
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signal.alarm(args.timeout)
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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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