119 lines
4.7 KiB
Python
119 lines
4.7 KiB
Python
# Copyright (c) Twisted Matrix Laboratories.
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# See LICENSE for details.
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"""
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Tests for L{twisted.names.tap}.
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"""
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from twisted.internet.base import ThreadedResolver
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from twisted.names.client import Resolver
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from twisted.names.dns import PORT
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from twisted.names.resolve import ResolverChain
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from twisted.names.secondary import SecondaryAuthorityService
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from twisted.names.tap import Options, _buildResolvers
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from twisted.python.runtime import platform
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from twisted.python.usage import UsageError
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from twisted.trial.unittest import SynchronousTestCase
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class OptionsTests(SynchronousTestCase):
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"""
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Tests for L{Options}, defining how command line arguments for the DNS server
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are parsed.
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"""
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def test_malformedSecondary(self) -> None:
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"""
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If the value supplied for an I{--secondary} option does not provide a
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server IP address, optional port number, and domain name,
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L{Options.parseOptions} raises L{UsageError}.
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"""
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options = Options()
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self.assertRaises(UsageError, options.parseOptions, ["--secondary", ""])
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self.assertRaises(UsageError, options.parseOptions, ["--secondary", "1.2.3.4"])
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self.assertRaises(
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UsageError, options.parseOptions, ["--secondary", "1.2.3.4:hello"]
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)
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self.assertRaises(
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UsageError,
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options.parseOptions,
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["--secondary", "1.2.3.4:hello/example.com"],
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)
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def test_secondary(self) -> None:
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"""
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An argument of the form C{"ip/domain"} is parsed by L{Options} for the
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I{--secondary} option and added to its list of secondaries, using the
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default DNS port number.
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"""
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options = Options()
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options.parseOptions(["--secondary", "1.2.3.4/example.com"])
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self.assertEqual([(("1.2.3.4", PORT), ["example.com"])], options.secondaries)
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def test_secondaryExplicitPort(self) -> None:
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"""
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An argument of the form C{"ip:port/domain"} can be used to specify an
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alternate port number for which to act as a secondary.
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"""
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options = Options()
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options.parseOptions(["--secondary", "1.2.3.4:5353/example.com"])
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self.assertEqual([(("1.2.3.4", 5353), ["example.com"])], options.secondaries)
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def test_secondaryAuthorityServices(self) -> None:
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"""
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After parsing I{--secondary} options, L{Options} constructs a
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L{SecondaryAuthorityService} instance for each configured secondary.
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"""
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options = Options()
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options.parseOptions(
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[
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"--secondary",
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"1.2.3.4:5353/example.com",
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"--secondary",
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"1.2.3.5:5354/example.com",
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]
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)
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self.assertEqual(len(options.svcs), 2)
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secondary = options.svcs[0]
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self.assertIsInstance(options.svcs[0], SecondaryAuthorityService)
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self.assertEqual(secondary.primary, "1.2.3.4")
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self.assertEqual(secondary._port, 5353)
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secondary = options.svcs[1]
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self.assertIsInstance(options.svcs[1], SecondaryAuthorityService)
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self.assertEqual(secondary.primary, "1.2.3.5")
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self.assertEqual(secondary._port, 5354)
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def test_recursiveConfiguration(self) -> None:
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"""
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Recursive DNS lookups, if enabled, should be a last-resort option.
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Any other lookup method (cache, local lookup, etc.) should take
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precedence over recursive lookups
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"""
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options = Options()
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options.parseOptions(["--hosts-file", "hosts.txt", "--recursive"])
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ca, cl = _buildResolvers(options)
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# Extra cleanup, necessary on POSIX because client.Resolver doesn't know
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# when to stop parsing resolv.conf. See #NNN for improving this.
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for x in cl:
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if isinstance(x, ResolverChain):
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recurser = x.resolvers[-1]
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if isinstance(recurser, Resolver):
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recurser._parseCall.cancel()
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# On Windows, we need to use a threaded resolver, which leaves trash
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# lying about that we can't easily clean up without reaching into the
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# reactor and cancelling them. We only cancel the cleanup functions, as
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# there should be no others (and it leaving a callLater lying about
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# should rightly cause the test to fail).
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if platform.getType() != "posix":
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# We want the delayed calls on the reactor, which should be all of
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# ours from the threaded resolver cleanup
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from twisted.internet import reactor
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for x in reactor._newTimedCalls: # type: ignore[attr-defined]
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self.assertEqual(x.func.__func__, ThreadedResolver._cleanup)
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x.cancel()
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self.assertIsInstance(cl[-1], ResolverChain)
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