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""" Tests for the I{hosts(5)}-based resolver, L{twisted.names.hosts}. """ from __future__ import division, absolute_import 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 GoodTempPathMixin(object): def path(self): return FilePath(self.mktemp().encode('utf-8')) class SearchHostsFileTests(TestCase, GoodTempPathMixin): """ 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 = self.path() hosts.setContent( b"10.2.3.4 foo.example.com\n") self.assertEqual( "10.2.3.4", searchFileFor(hosts.path, b"foo.example.com")) def test_notFoundAddress(self): """ If there is no address information for the hostname passed to L{searchFileFor}, L{None} is returned. """ hosts = self.path() hosts.setContent( b"10.2.3.4 foo.example.com\n") self.assertIsNone(searchFileFor(hosts.path, b"bar.example.com")) def test_firstAddress(self): """ The first address associated with the given hostname is returned. """ hosts = self.path() hosts.setContent( b"::1 foo.example.com\n" b"10.1.2.3 foo.example.com\n" b"fe80::21b:fcff:feee:5a1d foo.example.com\n") self.assertEqual("::1", searchFileFor(hosts.path, b"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 = self.path() hosts.setContent( b"127.0.1.1\thelmut.example.org\thelmut\n" b"# a comment\n" b"::1 localhost ip6-localhost ip6-loopback\n") self.assertEqual(searchFileFor(hosts.path, b'helmut'), '127.0.1.1') self.assertEqual( searchFileFor(hosts.path, b'helmut.example.org'), '127.0.1.1') self.assertEqual(searchFileFor(hosts.path, b'ip6-localhost'), '::1') self.assertEqual(searchFileFor(hosts.path, b'ip6-loopback'), '::1') self.assertEqual(searchFileFor(hosts.path, b'localhost'), '::1') class SearchHostsFileForAllTests(TestCase, GoodTempPathMixin): """ 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 = self.path() hosts.setContent( b"127.0.0.1 foobar.example.com\n" b"127.0.0.2 foobar.example.com\n" b"::1 foobar.example.com\n") self.assertEqual( ["127.0.0.1", "127.0.0.2", "::1"], searchFileForAll(hosts, b"foobar.example.com")) def test_caseInsensitively(self): """ L{searchFileForAll} searches for names case-insensitively. """ hosts = self.path() hosts.setContent(b"127.0.0.1 foobar.EXAMPLE.com\n") self.assertEqual( ["127.0.0.1"], searchFileForAll(hosts, b"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(self.path(), b"example.com")) class HostsTests(TestCase, GoodTempPathMixin): """ Tests for the I{hosts(5)}-based L{twisted.names.hosts.Resolver}. """ def setUp(self): f = self.path() f.setContent(b''' 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 ''') self.ttl = 4200 self.resolver = Resolver(f.path, self.ttl) def test_defaultPath(self): """ The default hosts file used by L{Resolver} is I{/etc/hosts} if no value is given for the C{file} initializer parameter. """ resolver = Resolver() self.assertEqual(b"/etc/hosts", resolver.file) def test_getHostByName(self): """ L{hosts.Resolver.getHostByName} returns a L{Deferred} which fires with a string giving the address of the queried name as found in the resolver's hosts file. """ data = [(b'EXAMPLE', '1.1.1.1'), (b'EXAMPLE.EXAMPLETHING', '1.1.1.1'), (b'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(b'multiple') def resolved(results): answers, authority, additional = results self.assertEqual( (RRHeader(b"multiple", A, IN, self.ttl, Record_A("1.1.1.3", self.ttl)), RRHeader(b"multiple", A, IN, self.ttl, Record_A("1.1.1.4", self.ttl))), answers) 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(b'ip6-multiple') def resolved(results): answers, authority, additional = results self.assertEqual( (RRHeader(b"ip6-multiple", AAAA, IN, self.ttl, Record_AAAA("::3", self.ttl)), RRHeader(b"ip6-multiple", AAAA, IN, self.ttl, Record_AAAA("::4", self.ttl))), answers) 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(b'mixed') def resolved(results): answers, authority, additional = results self.assertEqual( (RRHeader(b"mixed", A, IN, self.ttl, Record_A("1.1.1.2", self.ttl)),), answers) d.addCallback(resolved) return d def test_notImplemented(self): return self.assertFailure(self.resolver.lookupMailExchange(b'EXAMPLE'), NotImplementedError) def test_query(self): d = self.resolver.query(Query(b'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(b'foueoa'), DomainError) def test_lookupIPV6AddressNotFound(self): """ Like L{test_lookupAddressNotFound}, but for L{hosts.Resolver.lookupIPV6Address}. """ return self.assertFailure(self.resolver.lookupIPV6Address(b'foueoa'), DomainError) def test_lookupAllRecordsNotFound(self): """ Like L{test_lookupAddressNotFound}, but for L{hosts.Resolver.lookupAllRecords}. """ return self.assertFailure(self.resolver.lookupAllRecords(b'foueoa'), DomainError)