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# Copyright (c) Twisted Matrix Laboratories.
# See LICENSE for details.
"""
Tests for the I{hosts(5)}-based resolver, L{twisted.names.hosts}.
"""
from twisted.trial.unittest import TestCase
from twisted.python.filepath import FilePath
from twisted.internet.defer import gatherResults
from twisted.names.dns import (
A, AAAA, IN, DomainError, RRHeader, Query, Record_A, Record_AAAA)
from twisted.names.hosts import Resolver, searchFileFor, searchFileForAll
class SearchHostsFileTests(TestCase):
"""
Tests for L{searchFileFor}, a helper which finds the first address for a
particular hostname in a I{hosts(5)}-style file.
"""
def test_findAddress(self):
"""
If there is an IPv4 address for the hostname passed to
L{searchFileFor}, it is returned.
"""
hosts = FilePath(self.mktemp())
hosts.setContent(
"10.2.3.4 foo.example.com\n")
self.assertEqual(
"10.2.3.4", searchFileFor(hosts.path, "foo.example.com"))
def test_notFoundAddress(self):
"""
If there is no address information for the hostname passed to
L{searchFileFor}, C{None} is returned.
"""
hosts = FilePath(self.mktemp())
hosts.setContent(
"10.2.3.4 foo.example.com\n")
self.assertIdentical(
None, searchFileFor(hosts.path, "bar.example.com"))
def test_firstAddress(self):
"""
The first address associated with the given hostname is returned.
"""
hosts = FilePath(self.mktemp())
hosts.setContent(
"::1 foo.example.com\n"
"10.1.2.3 foo.example.com\n"
"fe80::21b:fcff:feee:5a1d foo.example.com\n")
self.assertEqual(
"::1", searchFileFor(hosts.path, "foo.example.com"))
def test_searchFileForAliases(self):
"""
For a host with a canonical name and one or more aliases,
L{searchFileFor} can find an address given any of the names.
"""
hosts = FilePath(self.mktemp())
hosts.setContent(
"127.0.1.1 helmut.example.org helmut\n"
"# a comment\n"
"::1 localhost ip6-localhost ip6-loopback\n")
self.assertEqual(searchFileFor(hosts.path, 'helmut'), '127.0.1.1')
self.assertEqual(
searchFileFor(hosts.path, 'helmut.example.org'), '127.0.1.1')
self.assertEqual(searchFileFor(hosts.path, 'ip6-localhost'), '::1')
self.assertEqual(searchFileFor(hosts.path, 'ip6-loopback'), '::1')
self.assertEqual(searchFileFor(hosts.path, 'localhost'), '::1')
class SearchHostsFileForAllTests(TestCase):
"""
Tests for L{searchFileForAll}, a helper which finds all addresses for a
particular hostname in a I{hosts(5)}-style file.
"""
def test_allAddresses(self):
"""
L{searchFileForAll} returns a list of all addresses associated with the
name passed to it.
"""
hosts = FilePath(self.mktemp())
hosts.setContent(
"127.0.0.1 foobar.example.com\n"
"127.0.0.2 foobar.example.com\n"
"::1 foobar.example.com\n")
self.assertEqual(
["127.0.0.1", "127.0.0.2", "::1"],
searchFileForAll(hosts, "foobar.example.com"))
def test_caseInsensitively(self):
"""
L{searchFileForAll} searches for names case-insensitively.
"""
hosts = FilePath(self.mktemp())
hosts.setContent("127.0.0.1 foobar.EXAMPLE.com\n")
self.assertEqual(
["127.0.0.1"], searchFileForAll(hosts, "FOOBAR.example.com"))
def test_readError(self):
"""
If there is an error reading the contents of the hosts file,
L{searchFileForAll} returns an empty list.
"""
self.assertEqual(
[], searchFileForAll(FilePath(self.mktemp()), "example.com"))
class HostsTestCase(TestCase):
"""
Tests for the I{hosts(5)}-based L{twisted.names.hosts.Resolver}.
"""
def setUp(self):
f = open('EtcHosts', 'w')
f.write('''
1.1.1.1 EXAMPLE EXAMPLE.EXAMPLETHING
::2 mixed
1.1.1.2 MIXED
::1 ip6thingy
1.1.1.3 multiple
1.1.1.4 multiple
::3 ip6-multiple
::4 ip6-multiple
''')
f.close()
self.ttl = 4200
self.resolver = Resolver('EtcHosts', self.ttl)
def testGetHostByName(self):
data = [('EXAMPLE', '1.1.1.1'),
('EXAMPLE.EXAMPLETHING', '1.1.1.1'),
('MIXED', '1.1.1.2'),
]
ds = [self.resolver.getHostByName(n).addCallback(self.assertEqual, ip)
for n, ip in data]
return gatherResults(ds)
def test_lookupAddress(self):
"""
L{hosts.Resolver.lookupAddress} returns a L{Deferred} which fires with A
records from the hosts file.
"""
d = self.resolver.lookupAddress('multiple')
def resolved((results, authority, additional)):
self.assertEqual(
(RRHeader("multiple", A, IN, self.ttl,
Record_A("1.1.1.3", self.ttl)),
RRHeader("multiple", A, IN, self.ttl,
Record_A("1.1.1.4", self.ttl))),
results)
d.addCallback(resolved)
return d
def test_lookupIPV6Address(self):
"""
L{hosts.Resolver.lookupIPV6Address} returns a L{Deferred} which fires
with AAAA records from the hosts file.
"""
d = self.resolver.lookupIPV6Address('ip6-multiple')
def resolved((results, authority, additional)):
self.assertEqual(
(RRHeader("ip6-multiple", AAAA, IN, self.ttl,
Record_AAAA("::3", self.ttl)),
RRHeader("ip6-multiple", AAAA, IN, self.ttl,
Record_AAAA("::4", self.ttl))),
results)
d.addCallback(resolved)
return d
def test_lookupAllRecords(self):
"""
L{hosts.Resolver.lookupAllRecords} returns a L{Deferred} which fires
with A records from the hosts file.
"""
d = self.resolver.lookupAllRecords('mixed')
def resolved((results, authority, additional)):
self.assertEqual(
(RRHeader("mixed", A, IN, self.ttl,
Record_A("1.1.1.2", self.ttl)),),
results)
d.addCallback(resolved)
return d
def testNotImplemented(self):
return self.assertFailure(self.resolver.lookupMailExchange('EXAMPLE'),
NotImplementedError)
def testQuery(self):
d = self.resolver.query(Query('EXAMPLE'))
d.addCallback(lambda x: self.assertEqual(x[0][0].payload.dottedQuad(),
'1.1.1.1'))
return d
def test_lookupAddressNotFound(self):
"""
L{hosts.Resolver.lookupAddress} returns a L{Deferred} which fires with
L{dns.DomainError} if the name passed in has no addresses in the hosts
file.
"""
return self.assertFailure(self.resolver.lookupAddress('foueoa'),
DomainError)
def test_lookupIPV6AddressNotFound(self):
"""
Like L{test_lookupAddressNotFound}, but for
L{hosts.Resolver.lookupIPV6Address}.
"""
return self.assertFailure(self.resolver.lookupIPV6Address('foueoa'),
DomainError)
def test_lookupAllRecordsNotFound(self):
"""
Like L{test_lookupAddressNotFound}, but for
L{hosts.Resolver.lookupAllRecords}.
"""
return self.assertFailure(self.resolver.lookupAllRecords('foueoa'),
DomainError)
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