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# Copyright (c) Twisted Matrix Laboratories.
# See LICENSE for details.
"""
Tests for L{twisted.names.tap}.
"""
from twisted.trial.unittest import TestCase
from twisted.python.usage import UsageError
from twisted.names.tap import Options, _buildResolvers
from twisted.names.dns import PORT
from twisted.names.secondary import SecondaryAuthorityService
from twisted.names.resolve import ResolverChain
from twisted.names.client import Resolver
class OptionsTests(TestCase):
"""
Tests for L{Options}, defining how command line arguments for the DNS server
are parsed.
"""
def test_malformedSecondary(self):
"""
If the value supplied for an I{--secondary} option does not provide a
server IP address, optional port number, and domain name,
L{Options.parseOptions} raises L{UsageError}.
"""
options = Options()
self.assertRaises(
UsageError, options.parseOptions, ['--secondary', ''])
self.assertRaises(
UsageError, options.parseOptions, ['--secondary', '1.2.3.4'])
self.assertRaises(
UsageError, options.parseOptions, ['--secondary', '1.2.3.4:hello'])
self.assertRaises(
UsageError, options.parseOptions,
['--secondary', '1.2.3.4:hello/example.com'])
def test_secondary(self):
"""
An argument of the form C{"ip/domain"} is parsed by L{Options} for the
I{--secondary} option and added to its list of secondaries, using the
default DNS port number.
"""
options = Options()
options.parseOptions(['--secondary', '1.2.3.4/example.com'])
self.assertEqual(
[(('1.2.3.4', PORT), ['example.com'])], options.secondaries)
def test_secondaryExplicitPort(self):
"""
An argument of the form C{"ip:port/domain"} can be used to specify an
alternate port number for for which to act as a secondary.
"""
options = Options()
options.parseOptions(['--secondary', '1.2.3.4:5353/example.com'])
self.assertEqual(
[(('1.2.3.4', 5353), ['example.com'])], options.secondaries)
def test_secondaryAuthorityServices(self):
"""
After parsing I{--secondary} options, L{Options} constructs a
L{SecondaryAuthorityService} instance for each configured secondary.
"""
options = Options()
options.parseOptions(['--secondary', '1.2.3.4:5353/example.com',
'--secondary', '1.2.3.5:5354/example.com'])
self.assertEqual(len(options.svcs), 2)
secondary = options.svcs[0]
self.assertIsInstance(options.svcs[0], SecondaryAuthorityService)
self.assertEqual(secondary.primary, '1.2.3.4')
self.assertEqual(secondary._port, 5353)
secondary = options.svcs[1]
self.assertIsInstance(options.svcs[1], SecondaryAuthorityService)
self.assertEqual(secondary.primary, '1.2.3.5')
self.assertEqual(secondary._port, 5354)
def test_recursiveConfiguration(self):
"""
Recursive DNS lookups, if enabled, should be a last-resort option.
Any other lookup method (cache, local lookup, etc.) should take
precedence over recursive lookups
"""
options = Options()
options.parseOptions(['--hosts-file', 'hosts.txt', '--recursive'])
ca, cl = _buildResolvers(options)
# Extra cleanup, necessary on POSIX because client.Resolver doesn't know
# when to stop parsing resolv.conf. See #NNN for improving this.
for x in cl:
if isinstance(x, ResolverChain):
recurser = x.resolvers[-1]
if isinstance(recurser, Resolver):
recurser._parseCall.cancel()
self.assertIsInstance(cl[-1], ResolverChain)
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