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c67b52684f
Add randomizens system test which ensures that NS are randomly selected. The test relies of the fact that `getaddresses_allowed()` logic won't allow to query more than 3 NS at the top-level. The `example.` zone has 4 NS and the 3 formers are lame. As a result, if the resolved doesn't randomize the NS selection, it will only quiery the 3 formers, which won't give an answer, and fails. With randomization enabled, there is a chance that the resolver queries the fourth NS, and gets the result.
32 lines
852 B
Python
32 lines
852 B
Python
# Copyright (C) Internet Systems Consortium, Inc. ("ISC")
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#
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# SPDX-License-Identifier: MPL-2.0
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#
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# This Source Code Form is subject to the terms of the Mozilla Public
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# License, v. 2.0. If a copy of the MPL was not distributed with this
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# file, you can obtain one at https://mozilla.org/MPL/2.0/.
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#
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# See the COPYRIGHT file distributed with this work for additional
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# information regarding copyright ownership.
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import dns.rcode
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import isctest
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def attempt_query(ns):
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ns.rndc("flush")
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msg = isctest.query.create("foo.example.", "A")
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res = isctest.query.udp(msg, ns.ip)
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if msg.rcode() == dns.rcode.NOERROR:
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return len(res.answer) == 1
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return False
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def test_randomizens(ns6):
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resolved = False
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for _ in range(1, 25):
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if attempt_query(ns6):
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resolved = True
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break
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assert resolved
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