Python socket.AF_INET Examples

def __init__( self ):
      """Initialize variables and setup server"""
      
      HOST = ""
      PORT = 5000

      self.board = []
      self.currentPlayer = 0
      self.turnCondition = threading.Condition()
      self.gameBeginEvent = threading.Event()

      for i in range( 9 ):
         self.board.append( None )

      # setup server socket
      self.server = socket.socket( socket.AF_INET,
         socket.SOCK_STREAM )
      self.server.bind( ( HOST, PORT ) )
      self.display( "Server awaiting connections..." ) 

def __init__(self, addr: Union[str, tuple, socket.socket]):
        """
        Args:
            addr: can be /var/run/usbmuxd or (localhost, 27015)
        """
        self._sock = None
        if isinstance(addr, socket.socket):
            self._sock = addr
            return
        if isinstance(addr, str):
            if not os.path.exists(addr):
                raise MuxError("socket unix:{} unable to connect".format(addr))
            family = socket.AF_UNIX
        else:
            family = socket.AF_INET

        self._sock = socket.socket(family, socket.SOCK_STREAM)
        self._sock.connect(addr) 

def __init__(self, stream, address, protocol):
        self.address = address
        # Save the socket's address family now so we know how to
        # interpret self.address even after the stream is closed
        # and its socket attribute replaced with None.
        if stream.socket is not None:
            self.address_family = stream.socket.family
        else:
            self.address_family = None
        # In HTTPServerRequest we want an IP, not a full socket address.
        if (self.address_family in (socket.AF_INET, socket.AF_INET6) and
                address is not None):
            self.remote_ip = address[0]
        else:
            # Unix (or other) socket; fake the remote address.
            self.remote_ip = '0.0.0.0'
        if protocol:
            self.protocol = protocol
        elif isinstance(stream, iostream.SSLIOStream):
            self.protocol = "https"
        else:
            self.protocol = "http"
        self._orig_remote_ip = self.remote_ip
        self._orig_protocol = self.protocol 

def is_ipaddress(hostname):
    """Detects whether the hostname given is an IP address.

    :param str hostname: Hostname to examine.
    :return: True if the hostname is an IP address, False otherwise.
    """
    if six.PY3 and isinstance(hostname, bytes):
        # IDN A-label bytes are ASCII compatible.
        hostname = hostname.decode('ascii')

    families = [socket.AF_INET]
    if hasattr(socket, 'AF_INET6'):
        families.append(socket.AF_INET6)

    for af in families:
        try:
            inet_pton(af, hostname)
        except (socket.error, ValueError, OSError):
            pass
        else:
            return True
    return False 

def __init__(self, stream, address, protocol):
        self.address = address
        # Save the socket's address family now so we know how to
        # interpret self.address even after the stream is closed
        # and its socket attribute replaced with None.
        if stream.socket is not None:
            self.address_family = stream.socket.family
        else:
            self.address_family = None
        # In HTTPServerRequest we want an IP, not a full socket address.
        if (self.address_family in (socket.AF_INET, socket.AF_INET6) and
                address is not None):
            self.remote_ip = address[0]
        else:
            # Unix (or other) socket; fake the remote address.
            self.remote_ip = '0.0.0.0'
        if protocol:
            self.protocol = protocol
        elif isinstance(stream, iostream.SSLIOStream):
            self.protocol = "https"
        else:
            self.protocol = "http"
        self._orig_remote_ip = self.remote_ip
        self._orig_protocol = self.protocol 

def server(args):
    berny = get_berny(args)
    host, port = args.socket
    server = socket(AF_INET, SOCK_STREAM)
    server.bind((host, int(port)))
    server.listen(0)
    while True:
        sock, addr = server.accept()
        f = sock.makefile('r+')
        geom = handler(berny, f)
        if geom:
            f.write(geom.dumps(args.format))
            f.flush()
        f.close()
        sock.close()
        if not geom:
            break 

def kernel_route_dst_prefix_str(route):
        dst = route.get_attr('RTA_DST')
        if dst is None:
            family = route["family"]
            if family == socket.AF_INET:
                prefix_str = "0.0.0.0/0"
            elif family == socket.AF_INET6:
                prefix_str = "::/0"
            else:
                prefix_str = "Default"
        else:
            prefix_str = dst
            dst_len = route["dst_len"]
            if dst_len is not None:
                prefix_str += "/" + str(dst_len)
        return prefix_str 

def bind_socket(host: str, port: int, *, backlog=100) -> socket.socket:
    """Create TCP server socket.
    :param host: IPv4, IPv6 or hostname may be specified
    :param port: TCP port number
    :param backlog: Maximum number of connections to queue
    :return: socket.socket object
    """
    try:  # IP address: family must be specified for IPv6 at least
        ip = ip_address(host)
        host = str(ip)
        sock = socket.socket(
            socket.AF_INET6 if ip.version == 6 else socket.AF_INET
        )
    except ValueError:  # Hostname, may become AF_INET or AF_INET6
        sock = socket.socket()
    sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
    sock.bind((host, port))
    sock.listen(backlog)
    return sock 

def log_tx_protocol_packet(self, level, sock, prelude, packet_info):
        if not self._tx_log.isEnabledFor(level):
            return
        if sock.family == socket.AF_INET:
            fam_str = "IPv4"
            from_str = "from {}:{}".format(sock.getsockname()[0], sock.getsockname()[1])
            to_str = "to {}:{}".format(sock.getpeername()[0], sock.getpeername()[1])
        else:
            assert sock.family == socket.AF_INET6
            fam_str = "IPv6"
            from_str = "from [{}]:{}".format(sock.getsockname()[0], sock.getsockname()[1])
            to_str = "to [{}]:{}".format(sock.getpeername()[0], sock.getpeername()[1])
        type_str = self.protocol_packet_type(packet_info.protocol_packet)
        packet_str = str(packet_info)
        self._tx_log.log(level, "[%s] %s %s %s %s %s %s" %
                         (self._log_id, prelude, fam_str, type_str, from_str, to_str, packet_str)) 

def _new_socket(self):
        transport_socket = socketlib.socket(
            socketlib.AF_INET, socketlib.SOCK_STREAM
        )

        if self.certfile and self.cafile and self.keyfile:
            context = ssl.create_default_context(
                ssl.Purpose.SERVER_AUTH, cafile=self.cafile
            )
            context.check_hostname = False
            context.load_cert_chain(
                certfile=self.certfile,
                keyfile=self.keyfile,
                password=self.password,
            )
            sock = context.wrap_socket(transport_socket, server_side=False)
        else:
            context = ssl.SSLContext(ssl.PROTOCOL_TLSv1_2)
            sock = context.wrap_socket(transport_socket)

        sock.settimeout(self._timeout)

        return sock 

def __init__(self, laddress, data_callback, family = None, o = None):
        if o == None:
            if family == None:
                if laddress != None and laddress[0].startswith('['):
                    family = socket.AF_INET6
                    laddress = (laddress[0][1:-1], laddress[1])
                else:
                    family = socket.AF_INET
            self.family = family
            self.laddress = laddress
            self.data_callback = data_callback
        else:
            self.laddress, self.data_callback, self.family, self.nworkers, self.flags, \
              self.ploss_out_rate, self.pdelay_out_max, self.ploss_in_rate, \
              self.pdelay_in_max = o.laddress, o.data_callback, o.family, \
              o.nworkers, o.flags, o.ploss_out_rate, o.pdelay_out_max, o.ploss_in_rate, \
              o.pdelay_in_max 

def _do_dns_lookup(hostname: str, port: int) -> str:
    try:
        addr_infos = socket.getaddrinfo(hostname, port, socket.AF_UNSPEC, socket.IPPROTO_IP)
    except (socket.gaierror, IndexError, ConnectionError):
        raise ServerHostnameCouldNotBeResolved(f"Could not resolve {hostname}")

    family, socktype, proto, canonname, sockaddr = addr_infos[0]

    # By default use the first DNS entry, IPv4 or IPv6
    tentative_ip_addr = sockaddr[0]

    # But try to use IPv4 if we have both IPv4 and IPv6 addresses, to work around buggy networks
    for family, socktype, proto, canonname, sockaddr in addr_infos:
        if family == socket.AF_INET:
            tentative_ip_addr = sockaddr[0]

    return tentative_ip_addr 

def Create(asyncSocketsPool, srvAddr, srvBacklog=256, bufSlots=None) :
        try :
            srvSocket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
        except :
            raise XAsyncTCPServerException('Create : Cannot open socket (no enought memory).')
        try :
            srvSocket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
            srvSocket.bind(srvAddr)
            srvSocket.listen(srvBacklog)
        except :
            raise XAsyncTCPServerException('Create : Error to binding the TCP server on this address.')
        if not bufSlots :
            bufSlots = XBufferSlots(256, 4096, keepAlloc=True)
        xAsyncTCPServer = XAsyncTCPServer( asyncSocketsPool,
                                           srvSocket,
                                           srvAddr,
                                           bufSlots )
        asyncSocketsPool.NotifyNextReadyForReading(xAsyncTCPServer, True)
        return xAsyncTCPServer

    # ------------------------------------------------------------------------ 

def freebsd_set_ip_address(self, dev, ip, serverip, netmask):
		sockfd = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
		try:
			#set ip, serverip and netmask
			ifaliasreq = struct.pack('<16sBBHI8sBBHI8sBBHI8sI', self.iface_name,
				16, socket.AF_INET, 0, struct.unpack('<I', socket.inet_aton(ip))[0], '\x00'*8,
				16, socket.AF_INET, 0, struct.unpack('<I', socket.inet_aton(serverip))[0], '\x00'*8,
				16, socket.AF_INET, 0, struct.unpack('<I', socket.inet_aton('255.255.255.255'))[0],
				'\x00'*8,
				0)
			fcntl.ioctl(sockfd, self.IOCTL_FREEBSD_SIOCAIFADDR, ifaliasreq)

			# get flags
			ifr = struct.pack('<16sh', self.iface_name, 0)
			flags = struct.unpack('<16sh', fcntl.ioctl(sockfd, self.IOCTL_FREEBSD_SIOCGIFFLAGS, ifr))[1]

			# set new flags
			flags = flags | self.IOCTL_FREEBSD_IFF_UP
			ifr = struct.pack('<16sh', self.iface_name, flags)

			# iface up
			fcntl.ioctl(sockfd, self.IOCTL_FREEBSD_SIOCSIFFLAGS, ifr)
		except Exception as e:
			common.internal_print("Something went wrong with setting up the interface.", -1)
			print(e)
			sys.exit(-1)

		# adding new route for forwarding packets properly.
		integer_ip = struct.unpack(">I", socket.inet_pton(socket.AF_INET, serverip))[0]
		rangeip = socket.inet_ntop(socket.AF_INET, struct.pack(">I", integer_ip & ((2**int(netmask))-1)<<32-int(netmask)))

		ps = subprocess.Popen(["route", "add", "-net", rangeip+"/"+netmask, serverip], stdout=subprocess.PIPE, stderr=subprocess.PIPE)
		(stdout, stderr) = ps.communicate()
		if stderr:
			if not "File exists" in stderr:
				common.internal_print("Error: adding client route: {0}".format(stderr), -1)
				sys.exit(-1)

		return 

def freebsd_tun_alloc(self, dev, flags):
		try:
			sockfd = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
			ifr = struct.pack('<16si', 'tun', 0)
			self.iface_name = fcntl.ioctl(sockfd, self.IOCTL_FREEBSD_SIOCIFCREATE2, ifr)
			self.iface_name = self.iface_name.rstrip("\x00")

			buff = array.array('c', dev+"\x00")
			caddr_t, _ = buff.buffer_info()
			ifr = struct.pack('16sP', self.iface_name, caddr_t);

			fcntl.ioctl(sockfd, self.IOCTL_FREEBSD_SIOCSIFNAME, ifr)
			tun = os.open("/dev/"+self.iface_name, os.O_RDWR | os.O_NONBLOCK)
			self.iface_name = dev

		except IOError as e:
			print e
			common.internal_print("Error: Cannot create tunnel. Is {0} in use?".format(dev), -1)
			sys.exit(-1)

		return tun 

def stop(self):
		self._stop = True

		if self.threads:
			for t in self.threads:
				t.stop()
		
		# not so nice solution to get rid of the block of listen()
		# unfortunately close() does not help on the block
		try:
			server_socket = self.sctp.sctpsocket_tcp(socket.AF_INET)
			if self.config.get("Global", "serverbind") == "0.0.0.0":
				server_socket.connect(("127.0.0.1", int(self.config.get(self.get_module_configname(), "serverport"))))
			else:
				server_socket.connect((self.config.get("Global", "serverbind"), int(self.config.get(self.get_module_configname(), "serverport"))))
		except:
			pass

		return 

def lin_set_ip_address(self, dev, ip, serverip, netmask):
		sockfd = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
		try:
			# set IP
			ifr  = struct.pack('<16sH2s4s8s', dev, socket.AF_INET, "\x00"*2, socket.inet_aton(ip), "\x00"*8)
			fcntl.ioctl(sockfd, self.IOCTL_LINUX_SIOCSIFADDR, ifr)

			# get flags
			ifr = struct.pack('<16sh', dev, 0)
			flags = struct.unpack('<16sh', fcntl.ioctl(sockfd, self.IOCTL_LINUX_SIOCSIFFLAGS, ifr))[1]

			# set new flags
			flags = flags | self.IOCTL_LINUX_IFF_UP
			ifr = struct.pack('<16sh', dev, flags)

			# iface up
			fcntl.ioctl(sockfd, self.IOCTL_LINUX_SIOCSIFFLAGS, ifr)
		except Exception as e:
			common.internal_print("Something went wrong with setting up the interface.", -1)
			print(e)
			sys.exit(-1)

		# adding new route for forwarding packets properly.
		integer_ip = struct.unpack(">I", socket.inet_pton(socket.AF_INET, serverip))[0]
		rangeip = socket.inet_ntop(socket.AF_INET, struct.pack(">I", integer_ip & ((2**int(netmask))-1)<<32-int(netmask)))

		integer_netmask = struct.pack(">I", ((2**int(netmask))-1)<<32-int(netmask))
		netmask = socket.inet_ntoa(integer_netmask)

		ps = subprocess.Popen(["route", "add", "-net", rangeip, "netmask", netmask, "dev", dev], stdout=subprocess.PIPE, stderr=subprocess.PIPE)
		(stdout, stderr) = ps.communicate()
		if stderr:
			if not "File exists" in stderr:
				common.internal_print("Error: adding client route: {0}".format(stderr), -1)
				sys.exit(-1)

		return 

def check(self):
		try:
			common.internal_print("Checking module on server: {0}".format(self.get_module_name()))

			server_socket = self.sctp.sctpsocket_tcp(socket.AF_INET)
			server_socket.settimeout(3)
			server_socket.connect((self.config.get("Global", "remoteserverip"), int(self.config.get(self.get_module_configname(), "serverport"))))
			client_fake_thread = SCTP_generic_thread(0, 0, None, None, server_socket, None, self.authentication, self.encryption_module, self.verbosity, self.config, self.get_module_name())
			client_fake_thread.do_check()
			client_fake_thread.communication(True)

			self.cleanup(server_socket)

		except socket.timeout:
			common.internal_print("Checking failed: {0}".format(self.get_module_name()), -1)
			self.cleanup(server_socket)
		except socket.error as exception:
			if exception.args[0] == 111:
				common.internal_print("Checking failed: {0}".format(self.get_module_name()), -1)
			else:
				common.internal_print("Connection error: {0}".format(self.get_module_name()), -1)
			self.cleanup(server_socket)

		return 

def _recreate(self) -> None:
        """Re-create the connector, aiohttp session, the APIClient and the Redis session."""
        # Use asyncio for DNS resolution instead of threads so threads aren't spammed.
        # Doesn't seem to have any state with regards to being closed, so no need to worry?
        self._resolver = aiohttp.AsyncResolver()

        # Its __del__ does send a warning but it doesn't always show up for some reason.
        if self._connector and not self._connector._closed:
            log.warning(
                "The previous connector was not closed; it will remain open and be overwritten"
            )

        if self.redis_session and not self.redis_session.closed:
            log.warning(
                "The previous redis pool was not closed; it will remain open and be overwritten"
            )

        # Create the redis session
        self.loop.create_task(self._create_redis_session())

        # Use AF_INET as its socket family to prevent HTTPS related problems both locally
        # and in production.
        self._connector = aiohttp.TCPConnector(
            resolver=self._resolver,
            family=socket.AF_INET,
        )

        # Client.login() will call HTTPClient.static_login() which will create a session using
        # this connector attribute.
        self.http.connector = self._connector

        # Its __del__ does send a warning but it doesn't always show up for some reason.
        if self.http_session and not self.http_session.closed:
            log.warning(
                "The previous session was not closed; it will remain open and be overwritten"
            )

        self.http_session = aiohttp.ClientSession(connector=self._connector)
        self.api_client.recreate(force=True, connector=self._connector) 

def resolve(self, host, port, family=0):
        if is_valid_ip(host):
            addresses = [host]
        else:
            # gethostbyname doesn't take callback as a kwarg
            self.channel.gethostbyname(host, family, (yield gen.Callback(1)))
            callback_args = yield gen.Wait(1)
            assert isinstance(callback_args, gen.Arguments)
            assert not callback_args.kwargs
            result, error = callback_args.args
            if error:
                raise Exception('C-Ares returned error %s: %s while resolving %s' %
                                (error, pycares.errno.strerror(error), host))
            addresses = result.addresses
        addrinfo = []
        for address in addresses:
            if '.' in address:
                address_family = socket.AF_INET
            elif ':' in address:
                address_family = socket.AF_INET6
            else:
                address_family = socket.AF_UNSPEC
            if family != socket.AF_UNSPEC and family != address_family:
                raise Exception('Requested socket family %d but got %d' %
                                (family, address_family))
            addrinfo.append((address_family, (address, port)))
        raise gen.Return(addrinfo) 

def __str__(self):
        if self.address_family in (socket.AF_INET, socket.AF_INET6):
            return self.remote_ip
        elif isinstance(self.address, bytes):
            # Python 3 with the -bb option warns about str(bytes),
            # so convert it explicitly.
            # Unix socket addresses are str on mac but bytes on linux.
            return native_str(self.address)
        else:
            return str(self.address) 

def test_connect_ipv4_ipv4(self):
        self.do_test_connect(socket.AF_INET, '127.0.0.1') 

def __str__(self):
        if self.address_family in (socket.AF_INET, socket.AF_INET6):
            return self.remote_ip
        elif isinstance(self.address, bytes):
            # Python 3 with the -bb option warns about str(bytes),
            # so convert it explicitly.
            # Unix socket addresses are str on mac but bytes on linux.
            return native_str(self.address)
        else:
            return str(self.address) 

def test_connect_ipv4_dual(self):
        self.do_test_connect(socket.AF_INET, 'localhost') 

def resolve(self, host, port, family=0):
        if is_valid_ip(host):
            addresses = [host]
        else:
            # gethostbyname doesn't take callback as a kwarg
            self.channel.gethostbyname(host, family, (yield gen.Callback(1)))
            callback_args = yield gen.Wait(1)
            assert isinstance(callback_args, gen.Arguments)
            assert not callback_args.kwargs
            result, error = callback_args.args
            if error:
                raise Exception('C-Ares returned error %s: %s while resolving %s' %
                                (error, pycares.errno.strerror(error), host))
            addresses = result.addresses
        addrinfo = []
        for address in addresses:
            if '.' in address:
                address_family = socket.AF_INET
            elif ':' in address:
                address_family = socket.AF_INET6
            else:
                address_family = socket.AF_UNSPEC
            if family != socket.AF_UNSPEC and family != address_family:
                raise Exception('Requested socket family %d but got %d' %
                                (family, address_family))
            addrinfo.append((address_family, (address, port)))
        raise gen.Return(addrinfo) 

def test_connect_ipv4_ipv4(self):
        self.do_test_connect(socket.AF_INET, '127.0.0.1') 

def test_future_interface(self):
        addrinfo = yield self.resolver.resolve('localhost', 80,
                                               socket.AF_UNSPEC)
        self.assertIn((socket.AF_INET, ('127.0.0.1', 80)),
                      addrinfo)


# It is impossible to quickly and consistently generate an error in name
# resolution, so test this case separately, using mocks as needed. 

def test_localhost(self):
        self.resolver.resolve('localhost', 80, callback=self.stop)
        result = self.wait()
        self.assertIn((socket.AF_INET, ('127.0.0.1', 80)), result) 

def resolve(self, host, port, family=0):
        # getHostByName doesn't accept IP addresses, so if the input
        # looks like an IP address just return it immediately.
        if twisted.internet.abstract.isIPAddress(host):
            resolved = host
            resolved_family = socket.AF_INET
        elif twisted.internet.abstract.isIPv6Address(host):
            resolved = host
            resolved_family = socket.AF_INET6
        else:
            deferred = self.resolver.getHostByName(utf8(host))
            resolved = yield gen.Task(deferred.addBoth)
            if isinstance(resolved, failure.Failure):
                resolved.raiseException()
            elif twisted.internet.abstract.isIPAddress(resolved):
                resolved_family = socket.AF_INET
            elif twisted.internet.abstract.isIPv6Address(resolved):
                resolved_family = socket.AF_INET6
            else:
                resolved_family = socket.AF_UNSPEC
        if family != socket.AF_UNSPEC and family != resolved_family:
            raise Exception('Requested socket family %d but got %d' %
                            (family, resolved_family))
        result = [
            (resolved_family, (resolved, port)),
        ]
        raise gen.Return(result) 

def bind_unused_port(reuse_port=False):
    """Binds a server socket to an available port on localhost.

    Returns a tuple (socket, port).
    """
    [sock] = netutil.bind_sockets(None, 'localhost', family=socket.AF_INET,
                                  reuse_port=reuse_port)
    port = sock.getsockname()[1]
    return sock, port