Python socket.SO_REUSEPORT Examples

def __init__(self, summary_table, group=DEFAULT_GROUP, port=DEFAULT_PORT, timeout=None):
        self._dummy_socket = socket.socket(socket.AF_INET, socket.SOCK_DGRAM, socket.IPPROTO_UDP)
        self._socket = socket.socket(socket.AF_INET, socket.SOCK_DGRAM, socket.IPPROTO_UDP)
        try:
            self._socket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
            try:
                self._socket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEPORT, 1)
            except AttributeError:
                # not available on Windows
                pass
            self._socket.bind(('', port))

            self._socket.settimeout(timeout)

            self._mreq = struct.pack('4sl', socket.inet_aton(group), socket.INADDR_ANY)
            self._socket.setsockopt(socket.IPPROTO_IP, socket.IP_ADD_MEMBERSHIP, self._mreq)
        except Exception:
            self._dummy_socket.close()
            self._socket.close()
            raise
        self._is_shutdown = False
        self._summary_table = summary_table
        self._group = group
        self._port = port 

def start(self):
        """Start the discovery process and listen for discovery requests."""
        self._logger.debug("Starting servers discovery")

        # Create a datagram socket bound on port 31013
        self._socket = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
        self._socket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
        if platform.system() == "Darwin":
            self._socket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEPORT, 1)
        self._socket.bind(("", 31013))
        self._socket.settimeout(0)
        self._socket.setblocking(0)

        self._read_notifier = QSocketNotifier(
            self._socket.fileno(), QSocketNotifier.Read, self
        )
        self._read_notifier.activated.connect(self._notify_read)
        self._read_notifier.setEnabled(True)
        self._started = True 

def __init__(self, hostname, port,
                 invoke=None, target=None, max_clients=5):
        """
        :param hostname: Hostname on which to listen, '' to accept any origin
        :param port: The TCP port to listen on
        :param invoke: The method to call at a new client connection
        :param target: The object to expose, will fallback to self if None
        :param max_clients: The max number of concurrent connection
        """
        s, pathspec = _get_socket(hostname, port, unlink=True)
        s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
        s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEPORT, 1)
        s.bind(pathspec)
        self.server_socket = s
        s.listen(max_clients)
        self.invoke = invoke
        self.target = target
        self.client_count = 0 

def __init__(self, own_id, is_client=True):
        self.address = get_ownip()
        self.broadcast = '255.255.255.255'
        self.port = settings.discovery_port
        self.own_id = own_id
        self.mask = IS_CLIENT if is_client else IS_SERVER

        # Create UDP socket
        self.handle = socket.socket(socket.AF_INET, socket.SOCK_DGRAM, socket.IPPROTO_UDP)

        # Ask operating system to let us do broadcasts from socket
        self.handle.setsockopt(socket.SOL_SOCKET, socket.SO_BROADCAST, 1)
        if hasattr(socket, 'SO_REUSEPORT'):
            self.handle.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEPORT, 1)
        else:
            self.handle.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)

        # Bind UDP socket to local port so we can receive pings
        self.handle.bind(('', self.port)) 

def accept(port):
    logger.info("accept %s", port)
    s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
    s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEPORT, 1)
    s.bind(('', port))
    s.listen(1)
    s.settimeout(5)
    while not STOP.is_set():
        try:
            conn, addr = s.accept()
        except socket.timeout:
            continue
        else:
            logger.info("Accept %s connected!", port)
            # STOP.set() 

def connect(local_addr, addr):
    logger.info("connect from %s to %s", local_addr, addr)
    s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
    s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEPORT, 1)
    s.bind(local_addr)
    while not STOP.is_set():
        try:
            s.connect(addr)
        except socket.error:
            continue
        # except Exception as exc:
        #     logger.exception("unexpected exception encountered")
        #     break
        else:
            logger.info("connected from %s to %s success!", local_addr, addr)
            # STOP.set() 

def test_create_server_reuse_port(self):
        proto = MyProto(self.loop)
        f = self.loop.create_server(
            lambda: proto, '0.0.0.0', 0)
        server = self.loop.run_until_complete(f)
        self.assertEqual(len(server.sockets), 1)
        sock = server.sockets[0]
        self.assertFalse(
            sock.getsockopt(
                socket.SOL_SOCKET, socket.SO_REUSEPORT))
        server.close()

        test_utils.run_briefly(self.loop)

        proto = MyProto(self.loop)
        f = self.loop.create_server(
            lambda: proto, '0.0.0.0', 0, reuse_port=True)
        server = self.loop.run_until_complete(f)
        self.assertEqual(len(server.sockets), 1)
        sock = server.sockets[0]
        self.assertTrue(
            sock.getsockopt(
                socket.SOL_SOCKET, socket.SO_REUSEPORT))
        server.close() 

def check_udp_connectivity(url, timeout=None):
    """Check UDP connectivity."""
    ipaddr, port = url.rsplit(':', 1)
    sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM, socket.IPPROTO_UDP)
    sock.settimeout(timeout)
    sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
    sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEPORT, 1)
    sock.bind(('', int(port)))
    mreq = struct.pack("4sl", socket.inet_aton(ipaddr), socket.INADDR_ANY)
    sock.setsockopt(socket.IPPROTO_IP, socket.IP_ADD_MEMBERSHIP, mreq)
    try:
        if sock.recv(10240):
            return True
    except socket.timeout:
        pass
    return False 

def test_create_server_reuse_port(self):
        proto = MyProto(self.loop)
        f = self.loop.create_server(
            lambda: proto, '0.0.0.0', 0)
        server = self.loop.run_until_complete(f)
        self.assertEqual(len(server.sockets), 1)
        sock = server.sockets[0]
        self.assertFalse(
            sock.getsockopt(
                socket.SOL_SOCKET, socket.SO_REUSEPORT))
        server.close()

        test_utils.run_briefly(self.loop)

        proto = MyProto(self.loop)
        f = self.loop.create_server(
            lambda: proto, '0.0.0.0', 0, reuse_port=True)
        server = self.loop.run_until_complete(f)
        self.assertEqual(len(server.sockets), 1)
        sock = server.sockets[0]
        self.assertTrue(
            sock.getsockopt(
                socket.SOL_SOCKET, socket.SO_REUSEPORT))
        server.close() 

def tcp_server_socket(host, port, family=socket.AF_INET, backlog=100,
                      reuse_address=True, reuse_port=False, ssl_context=None):
    raw_socket = socket.socket(family, socket.SOCK_STREAM)
    try:
        if reuse_address:
            raw_socket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, True)

        if reuse_port:
            try:
                raw_socket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEPORT, True)
            except (AttributeError, OSError) as e:
                log.warning('reuse_port=True option failed', exc_info=True)

        raw_socket.bind((host, port))
        raw_socket.listen(backlog)
    except Exception:
        raw_socket.close()
        raise

    return raw_socket 

def receive(*, group=DEFAULT_GROUP, port=DEFAULT_PORT, timeout=None):
    s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM, socket.IPPROTO_UDP)
    try:
        s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
        try:
            s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEPORT, 1)
        except AttributeError:
            # not available on Windows
            pass
        s.bind(('', port))

        s.settimeout(timeout)

        mreq = struct.pack('4sl', socket.inet_aton(group), socket.INADDR_ANY)
        s.setsockopt(socket.IPPROTO_IP, socket.IP_ADD_MEMBERSHIP, mreq)
        try:
            data, sender_addr = s.recvfrom(4096)
        finally:
            s.setsockopt(socket.IPPROTO_IP, socket.IP_DROP_MEMBERSHIP, mreq)
    finally:
        s.close()
    return data, sender_addr 

def test_create_datagram_endpoint_ip_addr(self, m_socket):
        def getaddrinfo(*args, **kw):
            self.fail('should not have called getaddrinfo')

        m_socket.getaddrinfo = getaddrinfo
        m_socket.socket.return_value.bind = bind = mock.Mock()
        self.loop._add_reader = mock.Mock()
        self.loop._add_reader._is_coroutine = False

        reuseport_supported = hasattr(socket, 'SO_REUSEPORT')
        coro = self.loop.create_datagram_endpoint(
            lambda: MyDatagramProto(loop=self.loop),
            local_addr=('1.2.3.4', 0),
            reuse_address=False,
            reuse_port=reuseport_supported)

        t, p = self.loop.run_until_complete(coro)
        try:
            bind.assert_called_with(('1.2.3.4', 0))
            m_socket.socket.assert_called_with(family=m_socket.AF_INET,
                                               proto=m_socket.IPPROTO_UDP,
                                               type=m_socket.SOCK_DGRAM)
        finally:
            t.close()
            test_utils.run_briefly(self.loop)  # allow transport to close 

def reserve_sock_addr() -> Iterator[Tuple[str, int]]:
    """Reserve an available TCP port to listen on.

    The reservation is done by binding a TCP socket to port 0 with
    ``SO_REUSEPORT`` flag set (requires Linux >=3.9). The socket is
    then kept open until the generator is closed.

    To reduce probability of 'hijacking' port, socket should stay open
    and should be closed _just before_ starting of ``tf.train.Server``
    """
    so_reuseport = get_so_reuseport()
    if so_reuseport is None:
        raise RuntimeError(
            "SO_REUSEPORT is not supported by the operating system") from None

    with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as sock:
        sock.setsockopt(socket.SOL_SOCKET, so_reuseport, 1)
        sock.bind(("", 0))
        _ipaddr, port = sock.getsockname()
        yield (socket.getfqdn(), port) 

def bind_port(sock, host="localhost"):
        if sock.family == socket.AF_INET and sock.type == socket.SOCK_STREAM:
            if hasattr(socket, 'SO_REUSEADDR'):
                if sock.getsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR) == 1:
                    raise ValueError("tests should never set the SO_REUSEADDR "
                                     "socket option on TCP/IP sockets!")
            if hasattr(socket, 'SO_REUSEPORT'):
                try:
                    if sock.getsockopt(socket.SOL_SOCKET,
                                       socket.SO_REUSEPORT) == 1:
                        raise ValueError(
                            "tests should never set the SO_REUSEPORT "
                            "socket option on TCP/IP sockets!")
                except OSError:
                    # Python's socket module was compiled using modern headers
                    # thus defining SO_REUSEPORT but this process is running
                    # under an older kernel that does not support SO_REUSEPORT.
                    pass
            if hasattr(socket, 'SO_EXCLUSIVEADDRUSE'):
                sock.setsockopt(socket.SOL_SOCKET, socket.SO_EXCLUSIVEADDRUSE, 1)

        sock.bind((host, 0))
        port = sock.getsockname()[1]
        return port 

def create_sockets(mcst_ipaddr, mcst_port):
        mreq = struct.pack("4sl", socket.inet_aton(mcst_ipaddr),
                           socket.INADDR_ANY)

        s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM,
                          socket.IPPROTO_UDP)
        s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
        s.setsockopt(socket.IPPROTO_IP, socket.IP_ADD_MEMBERSHIP, mreq)

        if platform.system() == "Windows":
            s.bind(("", mcst_port))
            return (s, )

        else:
            s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEPORT, 1)
            s.bind((mcst_ipaddr, mcst_port))

            bsock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM,
                                  socket.IPPROTO_UDP)
            bsock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
            bsock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEPORT, 1)
            bsock.bind(("", 1901))

            return (s, bsock) 

def test_create_server_reuse_port(self):
        proto = MyProto(self.loop)
        f = self.loop.create_server(
            lambda: proto, '0.0.0.0', 0)
        server = self.loop.run_until_complete(f)
        self.assertEqual(len(server.sockets), 1)
        sock = server.sockets[0]
        self.assertFalse(
            sock.getsockopt(
                socket.SOL_SOCKET, socket.SO_REUSEPORT))
        server.close()

        test_utils.run_briefly(self.loop)

        proto = MyProto(self.loop)
        f = self.loop.create_server(
            lambda: proto, '0.0.0.0', 0, reuse_port=True)
        server = self.loop.run_until_complete(f)
        self.assertEqual(len(server.sockets), 1)
        sock = server.sockets[0]
        self.assertTrue(
            sock.getsockopt(
                socket.SOL_SOCKET, socket.SO_REUSEPORT))
        server.close() 

def __init__(self, config=None):
        super(Eth, self).__init__(config)
        self.loadConfig(config)
        self.host = self.config.get("HOST")
        self.port = self.config.get("PORT")
        self.protocol = self.config.get("PROTOCOL")
        self.ipv6 = self.config.get("IPV6")
        self.use_tcp_no_delay = self.config.get("TCP_NODELAY")

        if self.ipv6 and not socket.has_ipv6:
            raise RuntimeError("IPv6 not supported by your platform.")
        else:
           address_family = socket.AF_INET6 if self.ipv6 else socket.AF_INET
        proto = socket.SOCK_STREAM if self.protocol == 'TCP' else socket.SOCK_DGRAM
        if self.host.lower() == "localhost":
            self.host = "::1" if self.ipv6 else "localhost"
        addrinfo = socket.getaddrinfo(self.host, self.port, address_family, proto)
        (self.address_family, self.socktype, self.proto, self.canonname, self.sockaddr) = addrinfo[0]
        self.status = 0
        self.sock = socket.socket(
            self.address_family,
            self.socktype,
            self.proto
        )
        self.selector = selectors.DefaultSelector()
        self.selector.register(self.sock, selectors.EVENT_READ)
        self.use_tcp = (self.protocol == 'TCP')
        self.sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
        if self.use_tcp and self.use_tcp_no_delay:
            self.sock.setsockopt(socket.IPPROTO_TCP, socket.TCP_NODELAY, 1)
        if hasattr(socket, "SO_REUSEPORT"):
            self.sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEPORT, 1)
        self.sock.settimeout(0.5) 

def bind_port(sock, host=HOST):
    """Bind the socket to a free port and return the port number.  Relies on
    ephemeral ports in order to ensure we are using an unbound port.  This is
    important as many tests may be running simultaneously, especially in a
    buildbot environment.  This method raises an exception if the sock.family
    is AF_INET and sock.type is SOCK_STREAM, *and* the socket has SO_REUSEADDR
    or SO_REUSEPORT set on it.  Tests should *never* set these socket options
    for TCP/IP sockets.  The only case for setting these options is testing
    multicasting via multiple UDP sockets.

    Additionally, if the SO_EXCLUSIVEADDRUSE socket option is available (i.e.
    on Windows), it will be set on the socket.  This will prevent anyone else
    from bind()'ing to our host/port for the duration of the test.
    """
    if sock.family == socket.AF_INET and sock.type == socket.SOCK_STREAM:
        if hasattr(socket, 'SO_REUSEADDR'):
            if sock.getsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR) == 1:
                raise TestFailed("tests should never set the SO_REUSEADDR "   \
                                 "socket option on TCP/IP sockets!")
        if hasattr(socket, 'SO_REUSEPORT'):
            try:
                if sock.getsockopt(socket.SOL_SOCKET, socket.SO_REUSEPORT) == 1:
                    raise TestFailed("tests should never set the SO_REUSEPORT "   \
                                     "socket option on TCP/IP sockets!")
            except EnvironmentError:
                # Python's socket module was compiled using modern headers
                # thus defining SO_REUSEPORT but this process is running
                # under an older kernel that does not support SO_REUSEPORT.
                pass
        if hasattr(socket, 'SO_EXCLUSIVEADDRUSE'):
            sock.setsockopt(socket.SOL_SOCKET, socket.SO_EXCLUSIVEADDRUSE, 1)

    sock.bind((host, 0))
    port = sock.getsockname()[1]
    return port 

def test_create_datagram_endpoint_nosoreuseport(self, m_socket):
        del m_socket.SO_REUSEPORT
        m_socket.socket.return_value = mock.Mock()

        coro = self.loop.create_datagram_endpoint(
            lambda: MyDatagramProto(loop=self.loop),
            local_addr=('127.0.0.1', 0),
            reuse_address=False,
            reuse_port=True)

        self.assertRaises(ValueError, self.loop.run_until_complete, coro) 

def bind_port(sock, host=HOST):
    """Bind the socket to a free port and return the port number.  Relies on
    ephemeral ports in order to ensure we are using an unbound port.  This is
    important as many tests may be running simultaneously, especially in a
    buildbot environment.  This method raises an exception if the sock.family
    is AF_INET and sock.type is SOCK_STREAM, *and* the socket has SO_REUSEADDR
    or SO_REUSEPORT set on it.  Tests should *never* set these socket options
    for TCP/IP sockets.  The only case for setting these options is testing
    multicasting via multiple UDP sockets.

    Additionally, if the SO_EXCLUSIVEADDRUSE socket option is available (i.e.
    on Windows), it will be set on the socket.  This will prevent anyone else
    from bind()'ing to our host/port for the duration of the test.
    """

    if sock.family == socket.AF_INET and sock.type == socket.SOCK_STREAM:
        if hasattr(socket, 'SO_REUSEADDR'):
            if sock.getsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR) == 1:
                raise TestFailed("tests should never set the SO_REUSEADDR "   \
                                 "socket option on TCP/IP sockets!")
        if hasattr(socket, 'SO_REUSEPORT'):
            try:
                if sock.getsockopt(socket.SOL_SOCKET, socket.SO_REUSEPORT) == 1:
                    raise TestFailed("tests should never set the SO_REUSEPORT "   \
                                     "socket option on TCP/IP sockets!")
            except OSError:
                # Python's socket module was compiled using modern headers
                # thus defining SO_REUSEPORT but this process is running
                # under an older kernel that does not support SO_REUSEPORT.
                pass
        if hasattr(socket, 'SO_EXCLUSIVEADDRUSE'):
            sock.setsockopt(socket.SOL_SOCKET, socket.SO_EXCLUSIVEADDRUSE, 1)

    sock.bind((host, 0))
    port = sock.getsockname()[1]
    return port 

def bind_port(sock, host=HOST):
    """Bind the socket to a free port and return the port number.  Relies on
    ephemeral ports in order to ensure we are using an unbound port.  This is
    important as many tests may be running simultaneously, especially in a
    buildbot environment.  This method raises an exception if the sock.family
    is AF_INET and sock.type is SOCK_STREAM, *and* the socket has SO_REUSEADDR
    or SO_REUSEPORT set on it.  Tests should *never* set these socket options
    for TCP/IP sockets.  The only case for setting these options is testing
    multicasting via multiple UDP sockets.

    Additionally, if the SO_EXCLUSIVEADDRUSE socket option is available (i.e.
    on Windows), it will be set on the socket.  This will prevent anyone else
    from bind()'ing to our host/port for the duration of the test.
    """

    if sock.family == socket.AF_INET and sock.type == socket.SOCK_STREAM:
        if hasattr(socket, 'SO_REUSEADDR'):
            if sock.getsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR) == 1:
                raise TestFailed("tests should never set the SO_REUSEADDR "   \
                                 "socket option on TCP/IP sockets!")
        if hasattr(socket, 'SO_REUSEPORT'):
            try:
                if sock.getsockopt(socket.SOL_SOCKET, socket.SO_REUSEPORT) == 1:
                    raise TestFailed("tests should never set the SO_REUSEPORT "   \
                                     "socket option on TCP/IP sockets!")
            except OSError:
                # Python's socket module was compiled using modern headers
                # thus defining SO_REUSEPORT but this process is running
                # under an older kernel that does not support SO_REUSEPORT.
                pass
        if hasattr(socket, 'SO_EXCLUSIVEADDRUSE'):
            sock.setsockopt(socket.SOL_SOCKET, socket.SO_EXCLUSIVEADDRUSE, 1)

    sock.bind((host, 0))
    port = sock.getsockname()[1]
    return port 

def __init__(self, port=8888):
    super(UDPThread, self).__init__()

    self.socket = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
    self.socket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEPORT, 1)
    self.socket.bind(('127.0.0.1', port))

    self.buffer = [] 

def _server(self) -> None:
        sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
        sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
        try:
            sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEPORT, 1)
        except AttributeError:
            pass

        # set the timeout to prevent the server loop from
        # blocking indefinitaly on sock.accept()
        sock.settimeout(0.5)
        sock.bind((self._host, self._port))
        sock.listen(1)
        with sock:
            while not self._closing.is_set():
                try:
                    client, addr = sock.accept()
                    with client:
                        sout = client.makefile('w', encoding='utf-8')
                        sin = client.makefile('r', encoding='utf-8')
                        self._interactive_loop(sin, sout)
                except (socket.timeout, OSError):
                    continue 

def bind_port(sock, host=HOST):
    """Bind the socket to a free port and return the port number.  Relies on
    ephemeral ports in order to ensure we are using an unbound port.  This is
    important as many tests may be running simultaneously, especially in a
    buildbot environment.  This method raises an exception if the sock.family
    is AF_INET and sock.type is SOCK_STREAM, *and* the socket has SO_REUSEADDR
    or SO_REUSEPORT set on it.  Tests should *never* set these socket options
    for TCP/IP sockets.  The only case for setting these options is testing
    multicasting via multiple UDP sockets.

    Additionally, if the SO_EXCLUSIVEADDRUSE socket option is available (i.e.
    on Windows), it will be set on the socket.  This will prevent anyone else
    from bind()'ing to our host/port for the duration of the test.
    """

    if sock.family == socket.AF_INET and sock.type == socket.SOCK_STREAM:
        if hasattr(socket, 'SO_REUSEADDR'):
            if sock.getsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR) == 1:
                raise TestFailed("tests should never set the SO_REUSEADDR "   \
                                 "socket option on TCP/IP sockets!")
        if hasattr(socket, 'SO_REUSEPORT'):
            try:
                if sock.getsockopt(socket.SOL_SOCKET, socket.SO_REUSEPORT) == 1:
                    raise TestFailed("tests should never set the SO_REUSEPORT "   \
                                     "socket option on TCP/IP sockets!")
            except socket.error:
                # Python's socket module was compiled using modern headers
                # thus defining SO_REUSEPORT but this process is running
                # under an older kernel that does not support SO_REUSEPORT.
                pass
        if hasattr(socket, 'SO_EXCLUSIVEADDRUSE'):
            sock.setsockopt(socket.SOL_SOCKET, socket.SO_EXCLUSIVEADDRUSE, 1)

    sock.bind((host, 0))
    port = sock.getsockname()[1]
    return port 

def bind_port(sock, host=HOST):
    """Bind the socket to a free port and return the port number.  Relies on
    ephemeral ports in order to ensure we are using an unbound port.  This is
    important as many tests may be running simultaneously, especially in a
    buildbot environment.  This method raises an exception if the sock.family
    is AF_INET and sock.type is SOCK_STREAM, *and* the socket has SO_REUSEADDR
    or SO_REUSEPORT set on it.  Tests should *never* set these socket options
    for TCP/IP sockets.  The only case for setting these options is testing
    multicasting via multiple UDP sockets.

    Additionally, if the SO_EXCLUSIVEADDRUSE socket option is available (i.e.
    on Windows), it will be set on the socket.  This will prevent anyone else
    from bind()'ing to our host/port for the duration of the test.
    """

    if sock.family == socket.AF_INET and sock.type == socket.SOCK_STREAM:
        if hasattr(socket, 'SO_REUSEADDR'):
            if sock.getsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR) == 1:
                raise TestFailed("tests should never set the SO_REUSEADDR "   \
                                 "socket option on TCP/IP sockets!")
        if hasattr(socket, 'SO_REUSEPORT'):
            try:
                if sock.getsockopt(socket.SOL_SOCKET, socket.SO_REUSEPORT) == 1:
                    raise TestFailed("tests should never set the SO_REUSEPORT "   \
                                     "socket option on TCP/IP sockets!")
            except socket.error:
                # Python's socket module was compiled using modern headers
                # thus defining SO_REUSEPORT but this process is running
                # under an older kernel that does not support SO_REUSEPORT.
                pass
        if hasattr(socket, 'SO_EXCLUSIVEADDRUSE'):
            sock.setsockopt(socket.SOL_SOCKET, socket.SO_EXCLUSIVEADDRUSE, 1)

    sock.bind((host, 0))
    port = sock.getsockname()[1]
    return port 

def bind_port(sock, host=HOST):
    """Bind the socket to a free port and return the port number.  Relies on
    ephemeral ports in order to ensure we are using an unbound port.  This is
    important as many tests may be running simultaneously, especially in a
    buildbot environment.  This method raises an exception if the sock.family
    is AF_INET and sock.type is SOCK_STREAM, *and* the socket has SO_REUSEADDR
    or SO_REUSEPORT set on it.  Tests should *never* set these socket options
    for TCP/IP sockets.  The only case for setting these options is testing
    multicasting via multiple UDP sockets.

    Additionally, if the SO_EXCLUSIVEADDRUSE socket option is available (i.e.
    on Windows), it will be set on the socket.  This will prevent anyone else
    from bind()'ing to our host/port for the duration of the test.
    """

    if sock.family == socket.AF_INET and sock.type == socket.SOCK_STREAM:
        if hasattr(socket, 'SO_REUSEADDR'):
            if sock.getsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR) == 1:
                raise TestFailed("tests should never set the SO_REUSEADDR "   \
                                 "socket option on TCP/IP sockets!")
        if hasattr(socket, 'SO_REUSEPORT'):
            try:
                if sock.getsockopt(socket.SOL_SOCKET, socket.SO_REUSEPORT) == 1:
                    raise TestFailed("tests should never set the SO_REUSEPORT "   \
                                     "socket option on TCP/IP sockets!")
            except socket.error:
                # Python's socket module was compiled using modern headers
                # thus defining SO_REUSEPORT but this process is running
                # under an older kernel that does not support SO_REUSEPORT.
                pass
        if hasattr(socket, 'SO_EXCLUSIVEADDRUSE'):
            sock.setsockopt(socket.SOL_SOCKET, socket.SO_EXCLUSIVEADDRUSE, 1)

    sock.bind((host, 0))
    port = sock.getsockname()[1]
    return port 

def ipv6Multicast(host='::1', maddr=maddr):
    haddr = socket.getaddrinfo(host, maddr[1], socket.AF_INET6, socket.SOCK_DGRAM)[0][-1]
    maddr = socket.getaddrinfo(maddr[0], maddr[1], socket.AF_INET6, socket.SOCK_DGRAM)[0][-1]

    sock = socket.socket(socket.AF_INET6, socket.SOCK_DGRAM)

    sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
    if hasattr(socket, "SO_REUSEPORT"):
        sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEPORT, 1)

    sock.setsockopt(socket.IPPROTO_IPV6, socket.IPV6_MULTICAST_LOOP, 1)
    sock.setsockopt(socket.IPPROTO_IPV6, socket.IPV6_MULTICAST_HOPS, 5)

    ifn = haddr[3] or if_nametoindex('lo0')
    ifn = struct.pack("I", ifn)
    sock.setsockopt(socket.IPPROTO_IPV6, socket.IPV6_MULTICAST_IF, ifn)

    group = socket.inet_pton(socket.AF_INET6, maddr[0]) + ifn
    sock.setsockopt(socket.IPPROTO_IPV6, socket.IPV6_JOIN_GROUP, group)

    sock.bind(haddr)
    sock.setblocking(False)

    return sock, maddr

#~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
#~ Main 
#~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 

def create_new_listener(self, ip, port):
        try:
            newsock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM, socket.IPPROTO_UDP)
            newsock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
            # BSD systems also need to set SO_REUSEPORT
            try:
                newsock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEPORT, 1)
            except:
                pass
            newsock.bind((ip, port))
            return newsock
        except Exception:
            return False

    # Return the class's primary server socket 

def initialize_sockets(self):
        try:
            # This is needed to join a multicast group
            self.mreq = struct.pack("4sl", socket.inet_aton(self.host), socket.INADDR_ANY)
            # Set up client socket
            self.csock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
            self.csock.setsockopt(socket.IPPROTO_IP, socket.IP_MULTICAST_TTL, 2)
            # Set up server socket
            self.ssock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM, socket.IPPROTO_UDP)
            self.ssock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
            # BSD systems also need to set SO_REUSEPORT
            try:
                self.ssock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEPORT, 1)
            except Exception:
                pass

            # Only bind to this interface
            if self.interface is not None:
                print_info("Binding to interface: " + self.interface)
                self.ssock.setsockopt(socket.SOL_SOCKET, socket.SO_BINDTODEVICE,
                                      struct.pack("%ds" % (len(self.interface) + 1,), self.interface))
                self.csock.setsockopt(socket.SOL_SOCKET, socket.SO_BINDTODEVICE,
                                      struct.pack("%ds" % (len(self.interface) + 1,), self.interface))

            try:
                self.ssock.bind(('', self.port))
            except Exception:
                print_warning("failed to bind: " + self.host + ":" + str(self.port) + " ")
            try:
                self.ssock.setsockopt(socket.IPPROTO_IP, socket.IP_ADD_MEMBERSHIP, self.mreq)
            except Exception:
                print_warning("failed to join multicast group")
        except Exception:
            print_error("failed to initialize UPNP sockets")
            return False
        return True

    # Clean up file/socket descriptors 

def test_create_server_nosoreuseport(self, m_socket):
        m_socket.getaddrinfo = socket.getaddrinfo
        del m_socket.SO_REUSEPORT
        m_socket.socket.return_value = mock.Mock()

        f = self.loop.create_server(
            MyProto, '0.0.0.0', 0, reuse_port=True)

        self.assertRaises(ValueError, self.loop.run_until_complete, f)