MINI Sh3ll

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

"""
Session Initialization Protocol tests.
"""

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

try:
    from twisted.internet.asyncioreactor import AsyncioSelectorReactor
except BaseException:
    AsyncioSelectorReactor = None  # type: ignore[assignment,misc]

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:[email protected]>;tag=a6c85cf
From: Alice <sip:[email protected]>;tag=1928301774
Call-ID: [email protected]
CSeq: 314159 INVITE
Contact: <sip:[email protected]>
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:[email protected]",
            "sip:j.doe:[email protected];transport=tcp",
            "sip:[email protected]?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:[email protected]>',
                "A. G. Bell",
                "sip:[email protected]",
                {},
            ),
            ("Anon <sip:[email protected]>", "Anon", "sip:[email protected]", {}),
            ("sip:[email protected]", "", "sip:[email protected]", {}),
            ("<sip:[email protected]>", "", "sip:[email protected]", {}),
            (
                "foo <sip:[email protected]>;tag=bar;foo=baz",
                "foo",
                "sip:[email protected]",
                {"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:[email protected]>")
        r.addHeader("contact", "<sip:[email protected]>")
        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:[email protected]>")
        r.addHeader("contact", "<sip:[email protected]>")
        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:[email protected]>")
        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:[email protected]")
        r.addHeader("contact", "sip:[email protected]: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:[email protected]")
        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:[email protected]"])
        self.assertEqual(m.headers["contact"], ["sip:[email protected]: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:[email protected]: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:[email protected]"])
        self.assertEqual(m.headers["contact"], ["sip:[email protected]: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("[email protected]", "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:[email protected]")
        r.addHeader("contact", "sip:[email protected]: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:[email protected]")
        r.addHeader("contact", "sip:[email protected]: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:[email protected]")
        r.addHeader("contact", "sip:[email protected]:%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:[email protected]")
        r.addHeader("contact", "sip:[email protected]:%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