manyi/venv/Lib/site-packages/twisted/test/test_sip.py

# -*- test-case-name: twisted.test.test_sip -*-
# Copyright (c) Twisted Matrix Laboratories.
# See LICENSE for details.

"""
Session Initialization Protocol tests.
"""

from twisted.cred import portal, checkers
from twisted.internet import defer, reactor
from twisted.protocols import sip
from twisted.trial import unittest

try:
    from twisted.internet.asyncioreactor import AsyncioSelectorReactor
except:
    AsyncioSelectorReactor = None

from zope.interface import implementer


# request, prefixed by random CRLFs
request1 = "\n\r\n\n\r" + """\
INVITE sip:foo SIP/2.0
From: mo
To: joe
Content-Length: 4

abcd""".replace("\n", "\r\n")

# request, no content-length
request2 = """INVITE sip:foo SIP/2.0
From: mo
To: joe

1234""".replace("\n", "\r\n")

# request, with garbage after
request3 = """INVITE sip:foo SIP/2.0
From: mo
To: joe
Content-Length: 4

1234

lalalal""".replace("\n", "\r\n")

# three requests
request4 = """INVITE sip:foo SIP/2.0
From: mo
To: joe
Content-Length: 0

INVITE sip:loop SIP/2.0
From: foo
To: bar
Content-Length: 4

abcdINVITE sip:loop SIP/2.0
From: foo
To: bar
Content-Length: 4

1234""".replace("\n", "\r\n")

# response, no content
response1 = """SIP/2.0 200 OK
From:  foo
To:bar
Content-Length: 0

""".replace("\n", "\r\n")

# short header version
request_short = """\
INVITE sip:foo SIP/2.0
f: mo
t: joe
l: 4

abcd""".replace("\n", "\r\n")

request_natted = """\
INVITE sip:foo SIP/2.0
Via: SIP/2.0/UDP 10.0.0.1:5060;rport

""".replace("\n", "\r\n")

# multiline headers (example from RFC 3621).
response_multiline = """\
SIP/2.0 200 OK
Via: SIP/2.0/UDP server10.biloxi.com
    ;branch=z9hG4bKnashds8;received=192.0.2.3
Via: SIP/2.0/UDP bigbox3.site3.atlanta.com
    ;branch=z9hG4bK77ef4c2312983.1;received=192.0.2.2
Via: SIP/2.0/UDP pc33.atlanta.com
    ;branch=z9hG4bK776asdhds ;received=192.0.2.1
To: Bob <sip:bob@biloxi.com>;tag=a6c85cf
From: Alice <sip:alice@atlanta.com>;tag=1928301774
Call-ID: a84b4c76e66710@pc33.atlanta.com
CSeq: 314159 INVITE
Contact: <sip:bob@192.0.2.4>
Content-Type: application/sdp
Content-Length: 0
\n""".replace("\n", "\r\n")

class TestRealm:
    def requestAvatar(self, avatarId, mind, *interfaces):
        return sip.IContact, None, lambda: None



class MessageParsingTests(unittest.TestCase):
    def setUp(self):
        self.l = []
        self.parser = sip.MessagesParser(self.l.append)


    def feedMessage(self, message):
        self.parser.dataReceived(message)
        self.parser.dataDone()


    def validateMessage(self, m, method, uri, headers, body):
        """
        Validate Requests.
        """
        self.assertEqual(m.method, method)
        self.assertEqual(m.uri.toString(), uri)
        self.assertEqual(m.headers, headers)
        self.assertEqual(m.body, body)
        self.assertEqual(m.finished, 1)


    def testSimple(self):
        l = self.l
        self.feedMessage(request1)
        self.assertEqual(len(l), 1)
        self.validateMessage(
            l[0], "INVITE", "sip:foo",
            {"from": ["mo"], "to": ["joe"], "content-length": ["4"]},
            "abcd")


    def testTwoMessages(self):
        l = self.l
        self.feedMessage(request1)
        self.feedMessage(request2)
        self.assertEqual(len(l), 2)
        self.validateMessage(
            l[0], "INVITE", "sip:foo",
            {"from": ["mo"], "to": ["joe"], "content-length": ["4"]},
            "abcd")
        self.validateMessage(l[1], "INVITE", "sip:foo",
                             {"from": ["mo"], "to": ["joe"]},
                             "1234")


    def testGarbage(self):
        l = self.l
        self.feedMessage(request3)
        self.assertEqual(len(l), 1)
        self.validateMessage(
            l[0], "INVITE", "sip:foo",
            {"from": ["mo"], "to": ["joe"], "content-length": ["4"]},
            "1234")


    def testThreeInOne(self):
        l = self.l
        self.feedMessage(request4)
        self.assertEqual(len(l), 3)
        self.validateMessage(
            l[0], "INVITE", "sip:foo",
            {"from": ["mo"], "to": ["joe"], "content-length": ["0"]},
            "")
        self.validateMessage(
            l[1], "INVITE", "sip:loop",
            {"from": ["foo"], "to": ["bar"], "content-length": ["4"]},
            "abcd")
        self.validateMessage(
            l[2], "INVITE", "sip:loop",
            {"from": ["foo"], "to": ["bar"], "content-length": ["4"]},
            "1234")


    def testShort(self):
        l = self.l
        self.feedMessage(request_short)
        self.assertEqual(len(l), 1)
        self.validateMessage(
            l[0], "INVITE", "sip:foo",
            {"from": ["mo"], "to": ["joe"], "content-length": ["4"]},
            "abcd")


    def testSimpleResponse(self):
        l = self.l
        self.feedMessage(response1)
        self.assertEqual(len(l), 1)
        m = l[0]
        self.assertEqual(m.code, 200)
        self.assertEqual(m.phrase, "OK")
        self.assertEqual(
            m.headers,
            {"from": ["foo"], "to": ["bar"], "content-length": ["0"]})
        self.assertEqual(m.body, "")
        self.assertEqual(m.finished, 1)


    def test_multiLine(self):
        """
        A header may be split across multiple lines.  Subsequent lines begin
        with C{" "} or C{"\\t"}.
        """
        l = self.l
        self.feedMessage(response_multiline)
        self.assertEqual(len(l), 1)
        m = l[0]
        self.assertEqual(
            m.headers['via'][0],
            "SIP/2.0/UDP server10.biloxi.com;"
            "branch=z9hG4bKnashds8;received=192.0.2.3")
        self.assertEqual(
            m.headers['via'][1],
            "SIP/2.0/UDP bigbox3.site3.atlanta.com;"
            "branch=z9hG4bK77ef4c2312983.1;received=192.0.2.2")
        self.assertEqual(
            m.headers['via'][2],
            "SIP/2.0/UDP pc33.atlanta.com;"
            "branch=z9hG4bK776asdhds ;received=192.0.2.1")



class MessageParsingFeedDataCharByCharTests(MessageParsingTests):
    """
    Same as base class, but feed data char by char.
    """

    def feedMessage(self, message):
        for c in message:
            self.parser.dataReceived(c)
        self.parser.dataDone()



class MakeMessageTests(unittest.TestCase):

    def testRequest(self):
        r = sip.Request("INVITE", "sip:foo")
        r.addHeader("foo", "bar")
        self.assertEqual(
            r.toString(),
            "INVITE sip:foo SIP/2.0\r\nFoo: bar\r\n\r\n")


    def testResponse(self):
        r = sip.Response(200, "OK")
        r.addHeader("foo", "bar")
        r.addHeader("Content-Length", "4")
        r.bodyDataReceived("1234")
        self.assertEqual(
            r.toString(),
            "SIP/2.0 200 OK\r\nFoo: bar\r\nContent-Length: 4\r\n\r\n1234")


    def testStatusCode(self):
        r = sip.Response(200)
        self.assertEqual(r.toString(), "SIP/2.0 200 OK\r\n\r\n")



class ViaTests(unittest.TestCase):

    def checkRoundtrip(self, v):
        s = v.toString()
        self.assertEqual(s, sip.parseViaHeader(s).toString())


    def testExtraWhitespace(self):
        v1 = sip.parseViaHeader('SIP/2.0/UDP 192.168.1.1:5060')
        v2 = sip.parseViaHeader('SIP/2.0/UDP     192.168.1.1:5060')
        self.assertEqual(v1.transport, v2.transport)
        self.assertEqual(v1.host, v2.host)
        self.assertEqual(v1.port, v2.port)


    def test_complex(self):
        """
        Test parsing a Via header with one of everything.
        """
        s = ("SIP/2.0/UDP first.example.com:4000;ttl=16;maddr=224.2.0.1"
             " ;branch=a7c6a8dlze (Example)")
        v = sip.parseViaHeader(s)
        self.assertEqual(v.transport, "UDP")
        self.assertEqual(v.host, "first.example.com")
        self.assertEqual(v.port, 4000)
        self.assertIsNone(v.rport)
        self.assertIsNone(v.rportValue)
        self.assertFalse(v.rportRequested)
        self.assertEqual(v.ttl, 16)
        self.assertEqual(v.maddr, "224.2.0.1")
        self.assertEqual(v.branch, "a7c6a8dlze")
        self.assertEqual(v.hidden, 0)
        self.assertEqual(v.toString(),
                          "SIP/2.0/UDP first.example.com:4000"
                          ";ttl=16;branch=a7c6a8dlze;maddr=224.2.0.1")
        self.checkRoundtrip(v)


    def test_simple(self):
        """
        Test parsing a simple Via header.
        """
        s = "SIP/2.0/UDP example.com;hidden"
        v = sip.parseViaHeader(s)
        self.assertEqual(v.transport, "UDP")
        self.assertEqual(v.host, "example.com")
        self.assertEqual(v.port, 5060)
        self.assertIsNone(v.rport)
        self.assertIsNone(v.rportValue)
        self.assertFalse(v.rportRequested)
        self.assertIsNone(v.ttl)
        self.assertIsNone(v.maddr)
        self.assertIsNone(v.branch)
        self.assertTrue(v.hidden)
        self.assertEqual(v.toString(),
                          "SIP/2.0/UDP example.com:5060;hidden")
        self.checkRoundtrip(v)


    def testSimpler(self):
        v = sip.Via("example.com")
        self.checkRoundtrip(v)


    def test_deprecatedRPort(self):
        """
        Setting rport to True is deprecated, but still produces a Via header
        with the expected properties.
        """
        v = sip.Via("foo.bar", rport=True)

        warnings = self.flushWarnings(
            offendingFunctions=[self.test_deprecatedRPort])
        self.assertEqual(len(warnings), 1)
        self.assertEqual(
            warnings[0]['message'],
            'rport=True is deprecated since Twisted 9.0.')
        self.assertEqual(
            warnings[0]['category'],
            DeprecationWarning)

        self.assertEqual(v.toString(), "SIP/2.0/UDP foo.bar:5060;rport")
        self.assertTrue(v.rport)
        self.assertTrue(v.rportRequested)
        self.assertIsNone(v.rportValue)


    def test_rport(self):
        """
        An rport setting of None should insert the parameter with no value.
        """
        v = sip.Via("foo.bar", rport=None)
        self.assertEqual(v.toString(), "SIP/2.0/UDP foo.bar:5060;rport")
        self.assertTrue(v.rportRequested)
        self.assertIsNone(v.rportValue)


    def test_rportValue(self):
        """
        An rport numeric setting should insert the parameter with the number
        value given.
        """
        v = sip.Via("foo.bar", rport=1)
        self.assertEqual(v.toString(), "SIP/2.0/UDP foo.bar:5060;rport=1")
        self.assertFalse(v.rportRequested)
        self.assertEqual(v.rportValue, 1)
        self.assertEqual(v.rport, 1)


    def testNAT(self):
        s = "SIP/2.0/UDP 10.0.0.1:5060;received=22.13.1.5;rport=12345"
        v = sip.parseViaHeader(s)
        self.assertEqual(v.transport, "UDP")
        self.assertEqual(v.host, "10.0.0.1")
        self.assertEqual(v.port, 5060)
        self.assertEqual(v.received, "22.13.1.5")
        self.assertEqual(v.rport, 12345)

        self.assertNotEqual(v.toString().find("rport=12345"), -1)


    def test_unknownParams(self):
        """
        Parsing and serializing Via headers with unknown parameters should work.
        """
        s = "SIP/2.0/UDP example.com:5060;branch=a12345b;bogus;pie=delicious"
        v = sip.parseViaHeader(s)
        self.assertEqual(v.toString(), s)



class URLTests(unittest.TestCase):

    def testRoundtrip(self):
        for url in [
            "sip:j.doe@big.com",
            "sip:j.doe:secret@big.com;transport=tcp",
            "sip:j.doe@big.com?subject=project",
            "sip:example.com",
            ]:
            self.assertEqual(sip.parseURL(url).toString(), url)


    def testComplex(self):
        s = ("sip:user:pass@hosta:123;transport=udp;user=phone;method=foo;"
             "ttl=12;maddr=1.2.3.4;blah;goo=bar?a=b&c=d")
        url = sip.parseURL(s)
        for k, v in [("username", "user"), ("password", "pass"),
                     ("host", "hosta"), ("port", 123),
                     ("transport", "udp"), ("usertype", "phone"),
                     ("method", "foo"), ("ttl", 12),
                     ("maddr", "1.2.3.4"), ("other", ["blah", "goo=bar"]),
                     ("headers", {"a": "b", "c": "d"})]:
            self.assertEqual(getattr(url, k), v)



class ParseTests(unittest.TestCase):

    def testParseAddress(self):
        for address, name, urls, params in [
            ('"A. G. Bell" <sip:foo@example.com>',
             "A. G. Bell", "sip:foo@example.com", {}),
            ("Anon <sip:foo@example.com>", "Anon", "sip:foo@example.com", {}),
            ("sip:foo@example.com", "", "sip:foo@example.com", {}),
            ("<sip:foo@example.com>", "", "sip:foo@example.com", {}),
            ("foo <sip:foo@example.com>;tag=bar;foo=baz", "foo",
             "sip:foo@example.com", {"tag": "bar", "foo": "baz"}),
            ]:
            gname, gurl, gparams = sip.parseAddress(address)
            self.assertEqual(name, gname)
            self.assertEqual(gurl.toString(), urls)
            self.assertEqual(gparams, params)



@implementer(sip.ILocator)
class DummyLocator:
    def getAddress(self, logicalURL):
        return defer.succeed(sip.URL("server.com", port=5060))



@implementer(sip.ILocator)
class FailingLocator:
    def getAddress(self, logicalURL):
        return defer.fail(LookupError())



class ProxyTests(unittest.TestCase):

    def setUp(self):
        self.proxy = sip.Proxy("127.0.0.1")
        self.proxy.locator = DummyLocator()
        self.sent = []
        self.proxy.sendMessage = lambda dest, msg: self.sent.append((dest, msg))


    def testRequestForward(self):
        r = sip.Request("INVITE", "sip:foo")
        r.addHeader("via", sip.Via("1.2.3.4").toString())
        r.addHeader("via", sip.Via("1.2.3.5").toString())
        r.addHeader("foo", "bar")
        r.addHeader("to", "<sip:joe@server.com>")
        r.addHeader("contact", "<sip:joe@1.2.3.5>")
        self.proxy.datagramReceived(r.toString(), ("1.2.3.4", 5060))
        self.assertEqual(len(self.sent), 1)
        dest, m = self.sent[0]
        self.assertEqual(dest.port, 5060)
        self.assertEqual(dest.host, "server.com")
        self.assertEqual(m.uri.toString(), "sip:foo")
        self.assertEqual(m.method, "INVITE")
        self.assertEqual(m.headers["via"],
                          ["SIP/2.0/UDP 127.0.0.1:5060",
                           "SIP/2.0/UDP 1.2.3.4:5060",
                           "SIP/2.0/UDP 1.2.3.5:5060"])


    def testReceivedRequestForward(self):
        r = sip.Request("INVITE", "sip:foo")
        r.addHeader("via", sip.Via("1.2.3.4").toString())
        r.addHeader("foo", "bar")
        r.addHeader("to", "<sip:joe@server.com>")
        r.addHeader("contact", "<sip:joe@1.2.3.4>")
        self.proxy.datagramReceived(r.toString(), ("1.1.1.1", 5060))
        dest, m = self.sent[0]
        self.assertEqual(m.headers["via"],
                          ["SIP/2.0/UDP 127.0.0.1:5060",
                           "SIP/2.0/UDP 1.2.3.4:5060;received=1.1.1.1"])


    def testResponseWrongVia(self):
        # first via must match proxy's address
        r = sip.Response(200)
        r.addHeader("via", sip.Via("foo.com").toString())
        self.proxy.datagramReceived(r.toString(), ("1.1.1.1", 5060))
        self.assertEqual(len(self.sent), 0)


    def testResponseForward(self):
        r = sip.Response(200)
        r.addHeader("via", sip.Via("127.0.0.1").toString())
        r.addHeader("via", sip.Via("client.com", port=1234).toString())
        self.proxy.datagramReceived(r.toString(), ("1.1.1.1", 5060))
        self.assertEqual(len(self.sent), 1)
        dest, m = self.sent[0]
        self.assertEqual((dest.host, dest.port), ("client.com", 1234))
        self.assertEqual(m.code, 200)
        self.assertEqual(m.headers["via"], ["SIP/2.0/UDP client.com:1234"])


    def testReceivedResponseForward(self):
        r = sip.Response(200)
        r.addHeader("via", sip.Via("127.0.0.1").toString())
        r.addHeader(
            "via",
            sip.Via("10.0.0.1", received="client.com").toString())
        self.proxy.datagramReceived(r.toString(), ("1.1.1.1", 5060))
        self.assertEqual(len(self.sent), 1)
        dest, m = self.sent[0]
        self.assertEqual((dest.host, dest.port), ("client.com", 5060))


    def testResponseToUs(self):
        r = sip.Response(200)
        r.addHeader("via", sip.Via("127.0.0.1").toString())
        l = []
        self.proxy.gotResponse = lambda *a: l.append(a)
        self.proxy.datagramReceived(r.toString(), ("1.1.1.1", 5060))
        self.assertEqual(len(l), 1)
        m, addr = l[0]
        self.assertEqual(len(m.headers.get("via", [])), 0)
        self.assertEqual(m.code, 200)


    def testLoop(self):
        r = sip.Request("INVITE", "sip:foo")
        r.addHeader("via", sip.Via("1.2.3.4").toString())
        r.addHeader("via", sip.Via("127.0.0.1").toString())
        self.proxy.datagramReceived(r.toString(), ("client.com", 5060))
        self.assertEqual(self.sent, [])


    def testCantForwardRequest(self):
        r = sip.Request("INVITE", "sip:foo")
        r.addHeader("via", sip.Via("1.2.3.4").toString())
        r.addHeader("to", "<sip:joe@server.com>")
        self.proxy.locator = FailingLocator()
        self.proxy.datagramReceived(r.toString(), ("1.2.3.4", 5060))
        self.assertEqual(len(self.sent), 1)
        dest, m = self.sent[0]
        self.assertEqual((dest.host, dest.port), ("1.2.3.4", 5060))
        self.assertEqual(m.code, 404)
        self.assertEqual(m.headers["via"], ["SIP/2.0/UDP 1.2.3.4:5060"])



class RegistrationTests(unittest.TestCase):

    def setUp(self):
        self.proxy = sip.RegisterProxy(host="127.0.0.1")
        self.registry = sip.InMemoryRegistry("bell.example.com")
        self.proxy.registry = self.proxy.locator = self.registry
        self.sent = []
        self.proxy.sendMessage = lambda dest, msg: self.sent.append((dest, msg))


    def tearDown(self):
        for d, uri in self.registry.users.values():
            d.cancel()
        del self.proxy


    def register(self):
        r = sip.Request("REGISTER", "sip:bell.example.com")
        r.addHeader("to", "sip:joe@bell.example.com")
        r.addHeader("contact", "sip:joe@client.com:1234")
        r.addHeader("via", sip.Via("client.com").toString())
        self.proxy.datagramReceived(r.toString(), ("client.com", 5060))


    def unregister(self):
        r = sip.Request("REGISTER", "sip:bell.example.com")
        r.addHeader("to", "sip:joe@bell.example.com")
        r.addHeader("contact", "*")
        r.addHeader("via", sip.Via("client.com").toString())
        r.addHeader("expires", "0")
        self.proxy.datagramReceived(r.toString(), ("client.com", 5060))


    def testRegister(self):
        self.register()
        dest, m = self.sent[0]
        self.assertEqual((dest.host, dest.port), ("client.com", 5060))
        self.assertEqual(m.code, 200)
        self.assertEqual(m.headers["via"], ["SIP/2.0/UDP client.com:5060"])
        self.assertEqual(m.headers["to"], ["sip:joe@bell.example.com"])
        self.assertEqual(m.headers["contact"], ["sip:joe@client.com:5060"])
        #
        # XX: See http://tm.tl/8886
        #
        if type(reactor) != AsyncioSelectorReactor:
            self.assertTrue(
                int(m.headers["expires"][0]) in (3600, 3601, 3599, 3598))
        self.assertEqual(len(self.registry.users), 1)
        dc, uri = self.registry.users["joe"]
        self.assertEqual(uri.toString(), "sip:joe@client.com:5060")
        d = self.proxy.locator.getAddress(sip.URL(username="joe",
                                                  host="bell.example.com"))
        d.addCallback(lambda desturl : (desturl.host, desturl.port))
        d.addCallback(self.assertEqual, ('client.com', 5060))
        return d


    def testUnregister(self):
        self.register()
        self.unregister()
        dest, m = self.sent[1]
        self.assertEqual((dest.host, dest.port), ("client.com", 5060))
        self.assertEqual(m.code, 200)
        self.assertEqual(m.headers["via"], ["SIP/2.0/UDP client.com:5060"])
        self.assertEqual(m.headers["to"], ["sip:joe@bell.example.com"])
        self.assertEqual(m.headers["contact"], ["sip:joe@client.com:5060"])
        self.assertEqual(m.headers["expires"], ["0"])
        self.assertEqual(self.registry.users, {})


    def addPortal(self):
        r = TestRealm()
        p = portal.Portal(r)
        c = checkers.InMemoryUsernamePasswordDatabaseDontUse()
        c.addUser('userXname@127.0.0.1', 'passXword')
        p.registerChecker(c)
        self.proxy.portal = p


    def testFailedAuthentication(self):
        self.addPortal()
        self.register()

        self.assertEqual(len(self.registry.users), 0)
        self.assertEqual(len(self.sent), 1)
        dest, m = self.sent[0]
        self.assertEqual(m.code, 401)


    def testWrongDomainRegister(self):
        r = sip.Request("REGISTER", "sip:wrong.com")
        r.addHeader("to", "sip:joe@bell.example.com")
        r.addHeader("contact", "sip:joe@client.com:1234")
        r.addHeader("via", sip.Via("client.com").toString())
        self.proxy.datagramReceived(r.toString(), ("client.com", 5060))
        self.assertEqual(len(self.sent), 0)


    def testWrongToDomainRegister(self):
        r = sip.Request("REGISTER", "sip:bell.example.com")
        r.addHeader("to", "sip:joe@foo.com")
        r.addHeader("contact", "sip:joe@client.com:1234")
        r.addHeader("via", sip.Via("client.com").toString())
        self.proxy.datagramReceived(r.toString(), ("client.com", 5060))
        self.assertEqual(len(self.sent), 0)


    def testWrongDomainLookup(self):
        self.register()
        url = sip.URL(username="joe", host="foo.com")
        d = self.proxy.locator.getAddress(url)
        self.assertFailure(d, LookupError)
        return d


    def testNoContactLookup(self):
        self.register()
        url = sip.URL(username="jane", host="bell.example.com")
        d = self.proxy.locator.getAddress(url)
        self.assertFailure(d, LookupError)
        return d



class Client(sip.Base):

    def __init__(self):
        sip.Base.__init__(self)
        self.received = []
        self.deferred = defer.Deferred()


    def handle_response(self, response, addr):
        self.received.append(response)
        self.deferred.callback(self.received)



class LiveTests(unittest.TestCase):

    def setUp(self):
        self.proxy = sip.RegisterProxy(host="127.0.0.1")
        self.registry = sip.InMemoryRegistry("bell.example.com")
        self.proxy.registry = self.proxy.locator = self.registry
        self.serverPort = reactor.listenUDP(
            0, self.proxy, interface="127.0.0.1")
        self.client = Client()
        self.clientPort = reactor.listenUDP(
            0, self.client, interface="127.0.0.1")
        self.serverAddress = (self.serverPort.getHost().host,
                              self.serverPort.getHost().port)


    def tearDown(self):
        for d, uri in self.registry.users.values():
            d.cancel()
        d1 = defer.maybeDeferred(self.clientPort.stopListening)
        d2 = defer.maybeDeferred(self.serverPort.stopListening)
        return defer.gatherResults([d1, d2])


    def testRegister(self):
        p = self.clientPort.getHost().port
        r = sip.Request("REGISTER", "sip:bell.example.com")
        r.addHeader("to", "sip:joe@bell.example.com")
        r.addHeader("contact", "sip:joe@127.0.0.1:%d" % p)
        r.addHeader("via", sip.Via("127.0.0.1", port=p).toString())
        self.client.sendMessage(
            sip.URL(host="127.0.0.1", port=self.serverAddress[1]), r)
        d = self.client.deferred
        def check(received):
            self.assertEqual(len(received), 1)
            r = received[0]
            self.assertEqual(r.code, 200)
        d.addCallback(check)
        return d


    def test_amoralRPort(self):
        """
        rport is allowed without a value, apparently because server
        implementors might be too stupid to check the received port
        against 5060 and see if they're equal, and because client
        implementors might be too stupid to bind to port 5060, or set a
        value on the rport parameter they send if they bind to another
        port.
        """
        p = self.clientPort.getHost().port
        r = sip.Request("REGISTER", "sip:bell.example.com")
        r.addHeader("to", "sip:joe@bell.example.com")
        r.addHeader("contact", "sip:joe@127.0.0.1:%d" % p)
        r.addHeader("via", sip.Via("127.0.0.1", port=p, rport=True).toString())
        warnings = self.flushWarnings(
            offendingFunctions=[self.test_amoralRPort])
        self.assertEqual(len(warnings), 1)
        self.assertEqual(
            warnings[0]['message'],
            'rport=True is deprecated since Twisted 9.0.')
        self.assertEqual(
            warnings[0]['category'],
            DeprecationWarning)
        self.client.sendMessage(sip.URL(host="127.0.0.1",
                                        port=self.serverAddress[1]),
                                r)
        d = self.client.deferred
        def check(received):
            self.assertEqual(len(received), 1)
            r = received[0]
            self.assertEqual(r.code, 200)
        d.addCallback(check)
        return d