class ByteEnumField(EnumField[int]):
    def __init__(self, name, default, enum):
        # type: (str, Optional[int], Dict[int, str]) -> None
        EnumField.__init__(self, name, default, enum, "B") class StrField(_StrField[bytes]):
    pass class ConditionalField(_FieldContainer):
    __slots__ = ["fld", "cond"]

    def __init__(self,
                 fld,  # type: Field[Any, Any]
                 cond  # type: Callable[[Packet], bool]
                 ):
        # type: (...) -> None
        self.fld = fld
        self.cond = cond

    def _evalcond(self, pkt):
        # type: (Packet) -> bool
        return bool(self.cond(pkt))

    def any2i(self, pkt, x):
        # type: (Optional[Packet], Any) -> Any
        # BACKWARD COMPATIBILITY
        # Note: we shouldn't need this function. (it's not correct)
        # However, having i2h implemented (#2364), it changes the default
        # behavior and broke all packets that wrongly use two ConditionalField
        # with the same name. Those packets are the problem: they are wrongly
        # built (they should either be re-using the same conditional field, or
        # using a MultipleTypeField).
        # But I don't want to dive into fixing all of them just yet,
        # so for now, let's keep this this way, even though it's not correct.
        if type(self.fld) is Field:
            return x
        return self.fld.any2i(pkt, x)

    def i2h(self, pkt, val):
        # type: (Optional[Packet], Any) -> Any
        if pkt and not self._evalcond(pkt):
            return None
        return self.fld.i2h(pkt, val)

    def getfield(self, pkt, s):
        # type: (Packet, bytes) -> Tuple[bytes, Any]
        if self._evalcond(pkt):
            return self.fld.getfield(pkt, s)
        else:
            return s, None

    def addfield(self, pkt, s, val):
        # type: (Packet, bytes, Any) -> bytes
        if self._evalcond(pkt):
            return self.fld.addfield(pkt, s, val)
        else:
            return s

    def __getattr__(self, attr):
        # type: (str) -> Any
        return getattr(self.fld, attr) class BitEnumField(_BitField[Union[List[int], int]], _EnumField[int]):
    __slots__ = EnumField.__slots__

    def __init__(self, name, default, size, enum, **kwargs):
        # type: (str, Optional[int], int, Dict[int, str], **Any) -> None
        _EnumField.__init__(self, name, default, enum)
        _BitField.__init__(self, name, default, size, **kwargs)

    def any2i(self, pkt, x):
        # type: (Optional[Packet], Any) -> Union[List[int], int]
        return _EnumField.any2i(self, pkt, x)

    def i2repr(self,
               pkt,  # type: Optional[Packet]
               x,  # type: Union[List[int], int]
               ):
        # type: (...) -> Any
        return _EnumField.i2repr(self, pkt, x) class BitField(_BitField[int]):
    __doc__ = _BitField.__doc__ class XByteField(ByteField):
    def i2repr(self, pkt, x):
        # type: (Optional[Packet], int) -> str
        return lhex(self.i2h(pkt, x)) class FieldListField(Field[List[Any], List[Any]]):
    __slots__ = ["field", "count_from", "length_from"]
    islist = 1

    def __init__(
            self,
            name,  # type: str
            default,  # type: Optional[List[AnyField]]
            field,  # type: AnyField
            length_from=None,  # type: Optional[Callable[[Packet], int]]
            count_from=None,  # type: Optional[Callable[[Packet], int]]
    ):
        # type: (...) -> None
        if default is None:
            default = []  # Create a new list for each instance
        self.field = field
        Field.__init__(self, name, default)
        self.count_from = count_from
        self.length_from = length_from

    def i2count(self, pkt, val):
        # type: (Optional[Packet], List[Any]) -> int
        if isinstance(val, list):
            return len(val)
        return 1

    def i2len(self, pkt, val):
        # type: (Packet, List[Any]) -> int
        return int(sum(self.field.i2len(pkt, v) for v in val))

    def any2i(self, pkt, x):
        # type: (Optional[Packet], List[Any]) -> List[Any]
        if not isinstance(x, list):
            return [self.field.any2i(pkt, x)]
        else:
            return [self.field.any2i(pkt, e) for e in x]

    def i2repr(self,
               pkt,  # type: Optional[Packet]
               x,  # type: List[Any]
               ):
        # type: (...) -> str
        return "[%s]" % ", ".join(self.field.i2repr(pkt, v) for v in x)

    def addfield(self,
                 pkt,  # type: Packet
                 s,  # type: bytes
                 val,  # type: Optional[List[Any]]
                 ):
        # type: (...) -> bytes
        val = self.i2m(pkt, val)
        for v in val:
            s = self.field.addfield(pkt, s, v)
        return s

    def getfield(self,
                 pkt,  # type: Packet
                 s,  # type: bytes
                 ):
        # type: (...) -> Any
        c = len_pkt = None
        if self.length_from is not None:
            len_pkt = self.length_from(pkt)
        elif self.count_from is not None:
            c = self.count_from(pkt)

        val = []
        ret = b""
        if len_pkt is not None:
            s, ret = s[:len_pkt], s[len_pkt:]

        while s:
            if c is not None:
                if c <= 0:
                    break
                c -= 1
            s, v = self.field.getfield(pkt, s)
            val.append(v)
        return s + ret, val class XShortField(ShortField):
    def i2repr(self, pkt, x):
        # type: (Optional[Packet], int) -> str
        return lhex(self.i2h(pkt, x)) class X3BytesField(ThreeBytesField, XByteField):
    def i2repr(self, pkt, x):
        # type: (Optional[Packet], int) -> str
        return XByteField.i2repr(self, pkt, x) class XIntField(IntField):
    def i2repr(self, pkt, x):
        # type: (Optional[Packet], int) -> str
        return lhex(self.i2h(pkt, x)) class ByteField(Field[int, int]):
    def __init__(self, name, default):
        # type: (str, Optional[int]) -> None
        Field.__init__(self, name, default, "B") class ShortField(Field[int, int]):
    def __init__(self, name, default):
        # type: (str, Optional[int]) -> None
        Field.__init__(self, name, default, "H") class ObservableDict(Dict[int, str]):
    """
    Helper class to specify a protocol extendable for runtime modifications
    """
    def __init__(self, *args, **kw):
        # type: (*Dict[int, str], **Any) -> None
        self.observers = []  # type: List[_EnumField[Any]]
        super(ObservableDict, self).__init__(*args, **kw)

    def observe(self, observer):
        # type: (_EnumField[Any]) -> None
        self.observers.append(observer)

    def __setitem__(self, key, value):
        # type: (int, str) -> None
        for o in self.observers:
            o.notify_set(self, key, value)
        super(ObservableDict, self).__setitem__(key, value)

    def __delitem__(self, key):
        # type: (int) -> None
        for o in self.observers:
            o.notify_del(self, key)
        super(ObservableDict, self).__delitem__(key)

    def update(self, anotherDict):  # type: ignore
        for k in anotherDict:
            self[k] = anotherDict[k] class XShortEnumField(ShortEnumField):
    def i2repr_one(self, pkt, x):
        # type: (Optional[Packet], int) -> str
        if self not in conf.noenum and not isinstance(x, VolatileValue):
            if self.i2s is not None:
                try:
                    return self.i2s[x]
                except KeyError:
                    pass
            elif self.i2s_cb:
                ret = self.i2s_cb(x)
                if ret is not None:
                    return ret
        return lhex(x) class XByteEnumField(ByteEnumField):
    def i2repr_one(self, pkt, x):
        # type: (Optional[Packet], int) -> str
        if self not in conf.noenum and not isinstance(x, VolatileValue):
            if self.i2s:
                try:
                    return self.i2s[x]
                except KeyError:
                    pass
            elif self.i2s_cb:
                ret = self.i2s_cb(x)
                if ret is not None:
                    return ret
        return lhex(x) class StrLenField(StrField):
    __slots__ = ["length_from", "max_length"]

    def __init__(
            self,
            name,  # type: str
            default,  # type: bytes
            length_from=None,  # type: Optional[Callable[[Packet], int]]
            max_length=None,  # type: Optional[Any]
    ):
        # type: (...) -> None
        super(StrLenField, self).__init__(name, default)
        self.length_from = length_from
        self.max_length = max_length

    def getfield(self, pkt, s):
        # type: (Any, bytes) -> Tuple[bytes, bytes]
        len_pkt = (self.length_from or (lambda x: 0))(pkt)
        return s[len_pkt:], self.m2i(pkt, s[:len_pkt])

    def randval(self):
        # type: () -> RandBin
        return RandBin(RandNum(0, self.max_length or 1200)) class FieldLenField(Field[int, int]):
    __slots__ = ["length_of", "count_of", "adjust"]

    def __init__(
            self,
            name,  # type: str
            default,  # type: Optional[Any]
            length_of=None,  # type: Optional[str]
            fmt="H",  # type: str
            count_of=None,  # type: Optional[str]
            adjust=lambda pkt, x: x,  # type: Callable[[Packet, int], int]
    ):
        # type: (...) -> None
        Field.__init__(self, name, default, fmt)
        self.length_of = length_of
        self.count_of = count_of
        self.adjust = adjust

    def i2m(self, pkt, x):
        # type: (Optional[Packet], Optional[int]) -> int
        if x is None and pkt is not None:
            if self.length_of is not None:
                fld, fval = pkt.getfield_and_val(self.length_of)
                f = fld.i2len(pkt, fval)
            elif self.count_of is not None:
                fld, fval = pkt.getfield_and_val(self.count_of)
                f = fld.i2count(pkt, fval)
            else:
                raise ValueError(
                    "Field should have either length_of or count_of"
                )
            x = self.adjust(pkt, f)
        elif x is None:
            x = 0
        return x class XStrFixedLenField(_XStrLenField, StrFixedLenField):
    """
    StrFixedLenField which value is printed as hexadecimal.
    """ class XStrLenField(_XStrLenField, StrLenField):
    """
    StrLenField which value is printed as hexadecimal.
    """ class Packet(six.with_metaclass(Packet_metaclass,  # type: ignore
             BasePacket, _CanvasDumpExtended)):
    __slots__ = [
        "time", "sent_time", "name",
        "default_fields", "fields", "fieldtype",
        "overload_fields", "overloaded_fields",
        "packetfields",
        "original", "explicit", "raw_packet_cache",
        "raw_packet_cache_fields", "_pkt", "post_transforms",
        # then payload and underlayer
        "payload", "underlayer",
        "name",
        # used for sr()
        "_answered",
        # used when sniffing
        "direction", "sniffed_on",
        # handle snaplen Vs real length
        "wirelen",
    ]
    name = None
    fields_desc = []  # type: Sequence[AnyField]
    deprecated_fields = {}  # type: Dict[str, Tuple[str, str]]
    overload_fields = {}  # type: Dict[Type[Packet], Dict[str, Any]]
    payload_guess = []  # type: List[Tuple[Dict[str, Any], Type[Packet]]]
    show_indent = 1
    show_summary = True
    match_subclass = False
    class_dont_cache = {}  # type: Dict[Type[Packet], bool]
    class_packetfields = {}  # type: Dict[Type[Packet], Any]
    class_default_fields = {}  # type: Dict[Type[Packet], Dict[str, Any]]
    class_default_fields_ref = {}  # type: Dict[Type[Packet], List[str]]
    class_fieldtype = {}  # type: Dict[Type[Packet], Dict[str, AnyField]]  # noqa: E501

    @classmethod
    def from_hexcap(cls):
        # type: (Type[Packet]) -> Packet
        return cls(import_hexcap())

    @classmethod
    def upper_bonds(self):
        # type: () -> None
        for fval, upper in self.payload_guess:
            print("%-20s  %s" % (upper.__name__, ", ".join("%-12s" % ("%s=%r" % i) for i in six.iteritems(fval))))  # noqa: E501

    @classmethod
    def lower_bonds(self):
        # type: () -> None
        for lower, fval in six.iteritems(self._overload_fields):
            print("%-20s  %s" % (lower.__name__, ", ".join("%-12s" % ("%s=%r" % i) for i in six.iteritems(fval))))  # noqa: E501

    def __init__(self,
                 _pkt=b"",  # type: bytes
                 post_transform=None,  # type: Any
                 _internal=0,  # type: int
                 _underlayer=None,  # type: Optional[Packet]
                 **fields  # type: Any
                 ):
        # type: (...) -> None
        self.time = time.time()  # type: Union[EDecimal, float]
        self.sent_time = None  # type: Union[EDecimal, float, None]
        self.name = (self.__class__.__name__
                     if self._name is None else
                     self._name)
        self.default_fields = {}  # type: Dict[str, Any]
        self.overload_fields = self._overload_fields
        self.overloaded_fields = {}  # type: Dict[str, Any]
        self.fields = {}  # type: Dict[str, Any]
        self.fieldtype = {}  # type: Dict[str, AnyField]
        self.packetfields = []  # type: List[AnyField]
        self.payload = NoPayload()
        self.init_fields()
        self.underlayer = _underlayer
        self.original = _pkt
        self.explicit = 0
        self.raw_packet_cache = None  # type: Optional[bytes]
        self.raw_packet_cache_fields = None  # type: Optional[Dict[str, Any]]  # noqa: E501
        self.wirelen = None  # type: Optional[int]
        self.direction = None  # type: Optional[int]
        self.sniffed_on = None  # type: Optional[_GlobInterfaceType]
        if _pkt:
            self.dissect(_pkt)
            if not _internal:
                self.dissection_done(self)
        # We use this strange initialization so that the fields
        # are initialized in their declaration order.
        # It is required to always support MultipleTypeField
        for field in self.fields_desc:
            fname = field.name
            try:
                value = fields.pop(fname)
            except KeyError:
                continue
            self.fields[fname] = self.get_field(fname).any2i(self, value)
        # The remaining fields are unknown
        for fname in fields:
            if fname in self.deprecated_fields:
                # Resolve deprecated fields
                value = fields[fname]
                fname = self._resolve_alias(fname)
                self.fields[fname] = self.get_field(fname).any2i(self, value)
                continue
            raise AttributeError(fname)
        if isinstance(post_transform, list):
            self.post_transforms = post_transform
        elif post_transform is None:
            self.post_transforms = []
        else:
            self.post_transforms = [post_transform]

    _PickleType = Tuple[
        Union[EDecimal, float],
        Optional[Union[EDecimal, float, None]],
        Optional[int],
        Optional[_GlobInterfaceType],
        Optional[int]
    ]

    def __reduce__(self):
        # type: () -> Tuple[Type[Packet], Tuple[bytes], Packet._PickleType]
        """Used by pickling methods"""
        return (self.__class__, (self.build(),), (
            self.time,
            self.sent_time,
            self.direction,
            self.sniffed_on,
            self.wirelen,
        ))

    def __setstate__(self, state):
        # type: (Packet._PickleType) -> Packet
        """Rebuild state using pickable methods"""
        self.time = state[0]
        self.sent_time = state[1]
        self.direction = state[2]
        self.sniffed_on = state[3]
        self.wirelen = state[4]
        return self

    def __deepcopy__(self,
                     memo,  # type: Any
                     ):
        # type: (...) -> Packet
        """Used by copy.deepcopy"""
        return self.copy()

    def init_fields(self):
        # type: () -> None
        """
        Initialize each fields of the fields_desc dict
        """

        if self.class_dont_cache.get(self.__class__, False):
            self.do_init_fields(self.fields_desc)
        else:
            self.do_init_cached_fields()

    def do_init_fields(self,
                       flist,  # type: Sequence[AnyField]
                       ):
        # type: (...) -> None
        """
        Initialize each fields of the fields_desc dict
        """
        default_fields = {}
        for f in flist:
            default_fields[f.name] = copy.deepcopy(f.default)
            self.fieldtype[f.name] = f
            if f.holds_packets:
                self.packetfields.append(f)
        # We set default_fields last to avoid race issues
        self.default_fields = default_fields

    def do_init_cached_fields(self):
        # type: () -> None
        """
        Initialize each fields of the fields_desc dict, or use the cached
        fields information
        """

        cls_name = self.__class__

        # Build the fields information
        if Packet.class_default_fields.get(cls_name, None) is None:
            self.prepare_cached_fields(self.fields_desc)

        # Use fields information from cache
        default_fields = Packet.class_default_fields.get(cls_name, None)
        if default_fields:
            self.default_fields = default_fields
            self.fieldtype = Packet.class_fieldtype[cls_name]
            self.packetfields = Packet.class_packetfields[cls_name]

            # Deepcopy default references
            for fname in Packet.class_default_fields_ref[cls_name]:
                value = self.default_fields[fname]
                try:
                    self.fields[fname] = value.copy()
                except AttributeError:
                    # Python 2.7 - list only
                    self.fields[fname] = value[:]

    def prepare_cached_fields(self, flist):
        # type: (Sequence[AnyField]) -> None
        """
        Prepare the cached fields of the fields_desc dict
        """

        cls_name = self.__class__

        # Fields cache initialization
        if not flist:
            return

        class_default_fields = dict()
        class_default_fields_ref = list()
        class_fieldtype = dict()
        class_packetfields = list()

        # Fields initialization
        for f in flist:
            if isinstance(f, MultipleTypeField):
                # Abort
                self.class_dont_cache[cls_name] = True
                self.do_init_fields(self.fields_desc)
                return

            tmp_copy = copy.deepcopy(f.default)
            class_default_fields[f.name] = tmp_copy
            class_fieldtype[f.name] = f
            if f.holds_packets:
                class_packetfields.append(f)

            # Remember references
            if isinstance(f.default, (list, dict, set, RandField, Packet)):
                class_default_fields_ref.append(f.name)

        # Apply
        Packet.class_default_fields_ref[cls_name] = class_default_fields_ref
        Packet.class_fieldtype[cls_name] = class_fieldtype
        Packet.class_packetfields[cls_name] = class_packetfields
        # Last to avoid racing issues
        Packet.class_default_fields[cls_name] = class_default_fields

    def dissection_done(self, pkt):
        # type: (Packet) -> None
        """DEV: will be called after a dissection is completed"""
        self.post_dissection(pkt)
        self.payload.dissection_done(pkt)

    def post_dissection(self, pkt):
        # type: (Packet) -> None
        """DEV: is called after the dissection of the whole packet"""
        pass

    def get_field(self, fld):
        # type: (str) -> AnyField
        """DEV: returns the field instance from the name of the field"""
        return self.fieldtype[fld]

    def add_payload(self, payload):
        # type: (Union[Packet, bytes]) -> None
        if payload is None:
            return
        elif not isinstance(self.payload, NoPayload):
            self.payload.add_payload(payload)
        else:
            if isinstance(payload, Packet):
                self.payload = payload
                payload.add_underlayer(self)
                for t in self.aliastypes:
                    if t in payload.overload_fields:
                        self.overloaded_fields = payload.overload_fields[t]
                        break
            elif isinstance(payload, (bytes, str, bytearray, memoryview)):
                self.payload = conf.raw_layer(load=bytes_encode(payload))
            else:
                raise TypeError("payload must be 'Packet', 'bytes', 'str', 'bytearray', or 'memoryview', not [%s]" % repr(payload))  # noqa: E501

    def remove_payload(self):
        # type: () -> None
        self.payload.remove_underlayer(self)
        self.payload = NoPayload()
        self.overloaded_fields = {}

    def add_underlayer(self, underlayer):
        # type: (Packet) -> None
        self.underlayer = underlayer

    def remove_underlayer(self, other):
        # type: (Packet) -> None
        self.underlayer = None

    def copy(self):
        # type: () -> Packet
        """Returns a deep copy of the instance."""
        clone = self.__class__()
        clone.fields = self.copy_fields_dict(self.fields)
        clone.default_fields = self.copy_fields_dict(self.default_fields)
        clone.overloaded_fields = self.overloaded_fields.copy()
        clone.underlayer = self.underlayer
        clone.explicit = self.explicit
        clone.raw_packet_cache = self.raw_packet_cache
        clone.raw_packet_cache_fields = self.copy_fields_dict(
            self.raw_packet_cache_fields
        )
        clone.wirelen = self.wirelen
        clone.post_transforms = self.post_transforms[:]
        clone.payload = self.payload.copy()
        clone.payload.add_underlayer(clone)
        clone.time = self.time
        return clone

    def _resolve_alias(self, attr):
        # type: (str) -> str
        new_attr, version = self.deprecated_fields[attr]
        warnings.warn(
            "%s has been deprecated in favor of %s since %s !" % (
                attr, new_attr, version
            ), DeprecationWarning
        )
        return new_attr

    def getfieldval(self, attr):
        # type: (str) -> Any
        if self.deprecated_fields and attr in self.deprecated_fields:
            attr = self._resolve_alias(attr)
        if attr in self.fields:
            return self.fields[attr]
        if attr in self.overloaded_fields:
            return self.overloaded_fields[attr]
        if attr in self.default_fields:
            return self.default_fields[attr]
        return self.payload.getfieldval(attr)

    def getfield_and_val(self, attr):
        # type: (str) -> Tuple[AnyField, Any]
        if self.deprecated_fields and attr in self.deprecated_fields:
            attr = self._resolve_alias(attr)
        if attr in self.fields:
            return self.get_field(attr), self.fields[attr]
        if attr in self.overloaded_fields:
            return self.get_field(attr), self.overloaded_fields[attr]
        if attr in self.default_fields:
            return self.get_field(attr), self.default_fields[attr]
        raise ValueError

    def __getattr__(self, attr):
        # type: (str) -> Any
        try:
            fld, v = self.getfield_and_val(attr)
        except ValueError:
            return self.payload.__getattr__(attr)
        if fld is not None:
            return fld.i2h(self, v)
        return v

    def setfieldval(self, attr, val):
        # type: (str, Any) -> None
        if self.deprecated_fields and attr in self.deprecated_fields:
            attr = self._resolve_alias(attr)
        if attr in self.default_fields:
            fld = self.get_field(attr)
            if fld is None:
                any2i = lambda x, y: y  # type: Callable[..., Any]
            else:
                any2i = fld.any2i
            self.fields[attr] = any2i(self, val)
            self.explicit = 0
            self.raw_packet_cache = None
            self.raw_packet_cache_fields = None
            self.wirelen = None
        elif attr == "payload":
            self.remove_payload()
            self.add_payload(val)
        else:
            self.payload.setfieldval(attr, val)

    def __setattr__(self, attr, val):
        # type: (str, Any) -> None
        if attr in self.__all_slots__:
            return object.__setattr__(self, attr, val)
        try:
            return self.setfieldval(attr, val)
        except AttributeError:
            pass
        return object.__setattr__(self, attr, val)

    def delfieldval(self, attr):
        # type: (str) -> None
        if attr in self.fields:
            del(self.fields[attr])
            self.explicit = 0  # in case a default value must be explicit
            self.raw_packet_cache = None
            self.raw_packet_cache_fields = None
            self.wirelen = None
        elif attr in self.default_fields:
            pass
        elif attr == "payload":
            self.remove_payload()
        else:
            self.payload.delfieldval(attr)

    def __delattr__(self, attr):
        # type: (str) -> None
        if attr == "payload":
            return self.remove_payload()
        if attr in self.__all_slots__:
            return object.__delattr__(self, attr)
        try:
            return self.delfieldval(attr)
        except AttributeError:
            pass
        return object.__delattr__(self, attr)

    def _superdir(self):
        # type: () -> Set[str]
        """
        Return a list of slots and methods, including those from subclasses.
        """
        attrs = set()
        cls = self.__class__
        if hasattr(cls, '__all_slots__'):
            attrs.update(cls.__all_slots__)
        for bcls in cls.__mro__:
            if hasattr(bcls, '__dict__'):
                attrs.update(bcls.__dict__)
        return attrs

    def __dir__(self):
        # type: () -> List[str]
        """
        Add fields to tab completion list.
        """
        return sorted(itertools.chain(self._superdir(), self.default_fields))

    def __repr__(self):
        # type: () -> str
        s = ""
        ct = conf.color_theme
        for f in self.fields_desc:
            if isinstance(f, ConditionalField) and not f._evalcond(self):
                continue
            if f.name in self.fields:
                fval = self.fields[f.name]
                if isinstance(fval, (list, dict, set)) and len(fval) == 0:
                    continue
                val = f.i2repr(self, fval)
            elif f.name in self.overloaded_fields:
                fover = self.overloaded_fields[f.name]
                if isinstance(fover, (list, dict, set)) and len(fover) == 0:
                    continue
                val = f.i2repr(self, fover)
            else:
                continue
            if isinstance(f, Emph) or f in conf.emph:
                ncol = ct.emph_field_name
                vcol = ct.emph_field_value
            else:
                ncol = ct.field_name
                vcol = ct.field_value

            s += " %s%s%s" % (ncol(f.name),
                              ct.punct("="),
                              vcol(val))
        return "%s%s %s %s%s%s" % (ct.punct("<"),
                                   ct.layer_name(self.__class__.__name__),
                                   s,
                                   ct.punct("|"),
                                   repr(self.payload),
                                   ct.punct(">"))

    if six.PY2:
        def __str__(self):
            # type: () -> str
            return self.build()
    else:
        def __str__(self):
            # type: () -> str
            warning("Calling str(pkt) on Python 3 makes no sense!")
            return str(self.build())

    def __bytes__(self):
        # type: () -> bytes
        return self.build()

    def __div__(self, other):
        # type: (Any) -> Packet
        if isinstance(other, Packet):
            cloneA = self.copy()
            cloneB = other.copy()
            cloneA.add_payload(cloneB)
            return cloneA
        elif isinstance(other, (bytes, str, bytearray, memoryview)):
            return self / conf.raw_layer(load=bytes_encode(other))
        else:
            return other.__rdiv__(self)  # type: ignore
    __truediv__ = __div__

    def __rdiv__(self, other):
        # type: (Any) -> Packet
        if isinstance(other, (bytes, str, bytearray, memoryview)):
            return conf.raw_layer(load=bytes_encode(other)) / self
        else:
            raise TypeError
    __rtruediv__ = __rdiv__

    def __mul__(self, other):
        # type: (Any) -> List[Packet]
        if isinstance(other, int):
            return [self] * other
        else:
            raise TypeError

    def __rmul__(self, other):
        # type: (Any) -> List[Packet]
        return self.__mul__(other)

    def __nonzero__(self):
        # type: () -> bool
        return True
    __bool__ = __nonzero__

    def __len__(self):
        # type: () -> int
        return len(self.__bytes__())

    def copy_field_value(self, fieldname, value):
        # type: (str, Any) -> Any
        return self.get_field(fieldname).do_copy(value)

    def copy_fields_dict(self, fields):
        # type: (_T) -> _T
        if fields is None:
            return None
        return {fname: self.copy_field_value(fname, fval)
                for fname, fval in six.iteritems(fields)}

    def clear_cache(self):
        # type: () -> None
        """Clear the raw packet cache for the field and all its subfields"""
        self.raw_packet_cache = None
        for fld, fval in six.iteritems(self.fields):
            fld = self.get_field(fld)
            if fld.holds_packets:
                if isinstance(fval, Packet):
                    fval.clear_cache()
                elif isinstance(fval, list):
                    for fsubval in fval:
                        fsubval.clear_cache()
        self.payload.clear_cache()

    def self_build(self):
        # type: () -> bytes
        """
        Create the default layer regarding fields_desc dict

        :param field_pos_list:
        """
        if self.raw_packet_cache is not None:
            for fname, fval in six.iteritems(self.raw_packet_cache_fields):
                if self.getfieldval(fname) != fval:
                    self.raw_packet_cache = None
                    self.raw_packet_cache_fields = None
                    self.wirelen = None
                    break
            if self.raw_packet_cache is not None:
                return self.raw_packet_cache
        p = b""
        for f in self.fields_desc:
            val = self.getfieldval(f.name)
            if isinstance(val, RawVal):
                p += bytes(val)
            else:
                try:
                    p = f.addfield(self, p, val)
                except Exception as ex:
                    try:
                        ex.args = (
                            "While disescting field '%s': " % f.name +
                            ex.args[0],
                        ) + ex.args[1:]
                    except (AttributeError, IndexError):
                        pass
                    raise ex
        return p

    def do_build_payload(self):
        # type: () -> bytes
        """
        Create the default version of the payload layer

        :return: a string of payload layer
        """
        return self.payload.do_build()

    def do_build(self):
        # type: () -> bytes
        """
        Create the default version of the layer

        :return: a string of the packet with the payload
        """
        if not self.explicit:
            self = next(iter(self))
        pkt = self.self_build()
        for t in self.post_transforms:
            pkt = t(pkt)
        pay = self.do_build_payload()
        if self.raw_packet_cache is None:
            return self.post_build(pkt, pay)
        else:
            return pkt + pay

    def build_padding(self):
        # type: () -> bytes
        return self.payload.build_padding()

    def build(self):
        # type: () -> bytes
        """
        Create the current layer

        :return: string of the packet with the payload
        """
        p = self.do_build()
        p += self.build_padding()
        p = self.build_done(p)
        return p

    def post_build(self, pkt, pay):
        # type: (bytes, bytes) -> bytes
        """
        DEV: called right after the current layer is build.

        :param str pkt: the current packet (build by self_build function)
        :param str pay: the packet payload (build by do_build_payload function)
        :return: a string of the packet with the payload
        """
        return pkt + pay

    def build_done(self, p):
        # type: (bytes) -> bytes
        return self.payload.build_done(p)

    def do_build_ps(self):
        # type: () -> Tuple[bytes, List[Tuple[Packet, List[Tuple[Field[Any, Any], str, bytes]]]]]  # noqa: E501
        p = b""
        pl = []
        q = b""
        for f in self.fields_desc:
            if isinstance(f, ConditionalField) and not f._evalcond(self):
                continue
            p = f.addfield(self, p, self.getfieldval(f.name))
            if isinstance(p, bytes):
                r = p[len(q):]
                q = p
            else:
                r = b""
            pl.append((f, f.i2repr(self, self.getfieldval(f.name)), r))

        pkt, lst = self.payload.build_ps(internal=1)
        p += pkt
        lst.append((self, pl))

        return p, lst

    def build_ps(self, internal=0):
        # type: (int) -> Tuple[bytes, List[Tuple[Packet, List[Tuple[Any, Any, bytes]]]]]  # noqa: E501
        p, lst = self.do_build_ps()
#        if not internal:
#            pkt = self
#            while pkt.haslayer(conf.padding_layer):
#                pkt = pkt.getlayer(conf.padding_layer)
#                lst.append( (pkt, [ ("loakjkjd", pkt.load, pkt.load) ] ) )
#                p += pkt.load
#                pkt = pkt.payload
        return p, lst

    def canvas_dump(self, layer_shift=0, rebuild=1):
        # type: (int, int) -> pyx.canvas.canvas
        if PYX == 0:
            raise ImportError("PyX and its dependencies must be installed")
        canvas = pyx.canvas.canvas()
        if rebuild:
            _, t = self.__class__(raw(self)).build_ps()
        else:
            _, t = self.build_ps()
        YTXTI = len(t)
        for _, l in t:
            YTXTI += len(l)
        YTXT = float(YTXTI)
        YDUMP = YTXT

        XSTART = 1
        XDSTART = 10
        y = 0.0
        yd = 0.0
        XMUL = 0.55
        YMUL = 0.4

        backcolor = colgen(0.6, 0.8, 1.0, trans=pyx.color.rgb)
        forecolor = colgen(0.2, 0.5, 0.8, trans=pyx.color.rgb)
#        backcolor=makecol(0.376, 0.729, 0.525, 1.0)

        def hexstr(x):
            # type: (bytes) -> str
            return " ".join("%02x" % orb(c) for c in x)

        def make_dump_txt(x, y, txt):
            # type: (int, float, bytes) -> pyx.text.text
            return pyx.text.text(
                XDSTART + x * XMUL,
                (YDUMP - y) * YMUL,
                r"\tt{%s}" % hexstr(txt),
                [pyx.text.size.Large]
            )

        def make_box(o):
            # type: (pyx.bbox.bbox) -> pyx.bbox.bbox
            return pyx.box.rect(
                o.left(), o.bottom(), o.width(), o.height(),
                relcenter=(0.5, 0.5)
            )

        def make_frame(lst):
            # type: (List[Any]) -> pyx.path.path
            if len(lst) == 1:
                b = lst[0].bbox()
                b.enlarge(pyx.unit.u_pt)
                return b.path()
            else:
                fb = lst[0].bbox()
                fb.enlarge(pyx.unit.u_pt)
                lb = lst[-1].bbox()
                lb.enlarge(pyx.unit.u_pt)
                if len(lst) == 2 and fb.left() > lb.right():
                    return pyx.path.path(pyx.path.moveto(fb.right(), fb.top()),
                                         pyx.path.lineto(fb.left(), fb.top()),
                                         pyx.path.lineto(fb.left(), fb.bottom()),  # noqa: E501
                                         pyx.path.lineto(fb.right(), fb.bottom()),  # noqa: E501
                                         pyx.path.moveto(lb.left(), lb.top()),
                                         pyx.path.lineto(lb.right(), lb.top()),
                                         pyx.path.lineto(lb.right(), lb.bottom()),  # noqa: E501
                                         pyx.path.lineto(lb.left(), lb.bottom()))  # noqa: E501
                else:
                    # XXX
                    gb = lst[1].bbox()
                    if gb != lb:
                        gb.enlarge(pyx.unit.u_pt)
                    kb = lst[-2].bbox()
                    if kb != gb and kb != lb:
                        kb.enlarge(pyx.unit.u_pt)
                    return pyx.path.path(pyx.path.moveto(fb.left(), fb.top()),
                                         pyx.path.lineto(fb.right(), fb.top()),
                                         pyx.path.lineto(fb.right(), kb.bottom()),  # noqa: E501
                                         pyx.path.lineto(lb.right(), kb.bottom()),  # noqa: E501
                                         pyx.path.lineto(lb.right(), lb.bottom()),  # noqa: E501
                                         pyx.path.lineto(lb.left(), lb.bottom()),  # noqa: E501
                                         pyx.path.lineto(lb.left(), gb.top()),
                                         pyx.path.lineto(fb.left(), gb.top()),
                                         pyx.path.closepath(),)

        def make_dump(s,   # type: bytes
                      shift=0,  # type: int
                      y=0.,  # type: float
                      col=None,  # type: pyx.color.color
                      bkcol=None,  # type: pyx.color.color
                      large=16  # type: int
                      ):
            # type: (...) -> Tuple[pyx.canvas.canvas, pyx.bbox.bbox, int, float]  # noqa: E501
            c = pyx.canvas.canvas()
            tlist = []
            while s:
                dmp, s = s[:large - shift], s[large - shift:]
                txt = make_dump_txt(shift, y, dmp)
                tlist.append(txt)
                shift += len(dmp)
                if shift >= 16:
                    shift = 0
                    y += 1
            if col is None:
                col = pyx.color.rgb.red
            if bkcol is None:
                bkcol = pyx.color.rgb.white
            c.stroke(make_frame(tlist), [col, pyx.deco.filled([bkcol]), pyx.style.linewidth.Thick])  # noqa: E501
            for txt in tlist:
                c.insert(txt)
            return c, tlist[-1].bbox(), shift, y

        last_shift, last_y = 0, 0.0
        while t:
            bkcol = next(backcolor)
            proto, fields = t.pop()
            y += 0.5
            pt = pyx.text.text(
                XSTART,
                (YTXT - y) * YMUL,
                r"\font\cmssfont=cmss10\cmssfont{%s}" % tex_escape(
                    str(proto.name)
                ),
                [pyx.text.size.Large]
            )
            y += 1
            ptbb = pt.bbox()
            ptbb.enlarge(pyx.unit.u_pt * 2)
            canvas.stroke(ptbb.path(), [pyx.color.rgb.black, pyx.deco.filled([bkcol])])  # noqa: E501
            canvas.insert(pt)
            for field, fval, fdump in fields:
                col = next(forecolor)
                ft = pyx.text.text(XSTART, (YTXT - y) * YMUL, r"\font\cmssfont=cmss10\cmssfont{%s}" % tex_escape(field.name))  # noqa: E501
                if isinstance(field, BitField):
                    fsize = '%sb' % field.size
                else:
                    fsize = '%sB' % len(fdump)
                if (hasattr(field, 'field') and
                        'LE' in field.field.__class__.__name__[:3] or
                        'LE' in field.__class__.__name__[:3]):
                    fsize = r'$\scriptstyle\langle$' + fsize
                st = pyx.text.text(XSTART + 3.4, (YTXT - y) * YMUL, r"\font\cmbxfont=cmssbx10 scaled 600\cmbxfont{%s}" % fsize, [pyx.text.halign.boxright])  # noqa: E501
                if isinstance(fval, str):
                    if len(fval) > 18:
                        fval = fval[:18] + "[...]"
                else:
                    fval = ""
                vt = pyx.text.text(XSTART + 3.5, (YTXT - y) * YMUL, r"\font\cmssfont=cmss10\cmssfont{%s}" % tex_escape(fval))  # noqa: E501
                y += 1.0
                if fdump:
                    dt, target, last_shift, last_y = make_dump(fdump, last_shift, last_y, col, bkcol)  # noqa: E501

                    dtb = target
                    vtb = vt.bbox()
                    bxvt = make_box(vtb)
                    bxdt = make_box(dtb)
                    dtb.enlarge(pyx.unit.u_pt)
                    try:
                        if yd < 0:
                            cnx = pyx.connector.curve(bxvt, bxdt, absangle1=0, absangle2=-90)  # noqa: E501
                        else:
                            cnx = pyx.connector.curve(bxvt, bxdt, absangle1=0, absangle2=90)  # noqa: E501
                    except Exception:
                        pass
                    else:
                        canvas.stroke(cnx, [pyx.style.linewidth.thin, pyx.deco.earrow.small, col])  # noqa: E501

                    canvas.insert(dt)

                canvas.insert(ft)
                canvas.insert(st)
                canvas.insert(vt)
            last_y += layer_shift

        return canvas

    def extract_padding(self, s):
        # type: (bytes) -> Tuple[bytes, Optional[bytes]]
        """
        DEV: to be overloaded to extract current layer's padding.

        :param str s: the current layer
        :return: a couple of strings (actual layer, padding)
        """
        return s, None

    def post_dissect(self, s):
        # type: (bytes) -> bytes
        """DEV: is called right after the current layer has been dissected"""
        return s

    def pre_dissect(self, s):
        # type: (bytes) -> bytes
        """DEV: is called right before the current layer is dissected"""
        return s

    def do_dissect(self, s):
        # type: (bytes) -> bytes
        _raw = s
        self.raw_packet_cache_fields = {}
        for f in self.fields_desc:
            if not s:
                break
            s, fval = f.getfield(self, s)
            # Skip unused ConditionalField
            if isinstance(f, ConditionalField) and fval is None:
                continue
            # We need to track fields with mutable values to discard
            # .raw_packet_cache when needed.
            if f.islist or f.holds_packets or f.ismutable:
                self.raw_packet_cache_fields[f.name] = f.do_copy(fval)
            self.fields[f.name] = fval
        self.raw_packet_cache = _raw[:-len(s)] if s else _raw
        self.explicit = 1
        return s

    def do_dissect_payload(self, s):
        # type: (bytes) -> None
        """
        Perform the dissection of the layer's payload

        :param str s: the raw layer
        """
        if s:
            cls = self.guess_payload_class(s)
            try:
                p = cls(s, _internal=1, _underlayer=self)
            except KeyboardInterrupt:
                raise
            except Exception:
                if conf.debug_dissector:
                    if issubtype(cls, Packet):
                        log_runtime.error("%s dissector failed", cls.__name__)
                    else:
                        log_runtime.error("%s.guess_payload_class() returned "
                                          "[%s]",
                                          self.__class__.__name__, repr(cls))
                    if cls is not None:
                        raise
                p = conf.raw_layer(s, _internal=1, _underlayer=self)
            self.add_payload(p)

    def dissect(self, s):
        # type: (bytes) -> None
        s = self.pre_dissect(s)

        s = self.do_dissect(s)

        s = self.post_dissect(s)

        payl, pad = self.extract_padding(s)
        self.do_dissect_payload(payl)
        if pad and conf.padding:
            self.add_payload(conf.padding_layer(pad))

    def guess_payload_class(self, payload):
        # type: (bytes) -> Type[Packet]
        """
        DEV: Guesses the next payload class from layer bonds.
        Can be overloaded to use a different mechanism.

        :param str payload: the layer's payload
        :return: the payload class
        """
        for t in self.aliastypes:
            for fval, cls in t.payload_guess:
                try:
                    if all(v == self.getfieldval(k)
                           for k, v in six.iteritems(fval)):
                        return cls  # type: ignore
                except AttributeError:
                    pass
        return self.default_payload_class(payload)

    def default_payload_class(self, payload):
        # type: (bytes) -> Type[Packet]
        """
        DEV: Returns the default payload class if nothing has been found by the
        guess_payload_class() method.

        :param str payload: the layer's payload
        :return: the default payload class define inside the configuration file
        """
        return conf.raw_layer

    def hide_defaults(self):
        # type: () -> None
        """Removes fields' values that are the same as default values."""
        # use list(): self.fields is modified in the loop
        for k, v in list(six.iteritems(self.fields)):
            v = self.fields[k]
            if k in self.default_fields:
                if self.default_fields[k] == v:
                    del self.fields[k]
        self.payload.hide_defaults()

    def clone_with(self, payload=None, **kargs):
        # type: (Optional[Any], **Any) -> Any
        pkt = self.__class__()
        pkt.explicit = 1
        pkt.fields = kargs
        pkt.default_fields = self.copy_fields_dict(self.default_fields)
        pkt.overloaded_fields = self.overloaded_fields.copy()
        pkt.time = self.time
        pkt.underlayer = self.underlayer
        pkt.post_transforms = self.post_transforms
        pkt.raw_packet_cache = self.raw_packet_cache
        pkt.raw_packet_cache_fields = self.copy_fields_dict(
            self.raw_packet_cache_fields
        )
        pkt.wirelen = self.wirelen
        if payload is not None:
            pkt.add_payload(payload)
        return pkt

    def __iter__(self):
        # type: () -> Iterator[Packet]
        """Iterates through all sub-packets generated by this Packet."""
        def loop(todo, done, self=self):
            # type: (List[str], Dict[str, Any], Any) -> Iterator[Packet]
            if todo:
                eltname = todo.pop()
                elt = self.getfieldval(eltname)
                if not isinstance(elt, Gen):
                    if self.get_field(eltname).islist:
                        elt = SetGen([elt])
                    else:
                        elt = SetGen(elt)
                for e in elt:
                    done[eltname] = e
                    for x in loop(todo[:], done):
                        yield x
            else:
                if isinstance(self.payload, NoPayload):
                    payloads = SetGen([None])  # type: SetGen[Packet]
                else:
                    payloads = self.payload
                for payl in payloads:
                    # Let's make sure subpackets are consistent
                    done2 = done.copy()
                    for k in done2:
                        if isinstance(done2[k], VolatileValue):
                            done2[k] = done2[k]._fix()
                    pkt = self.clone_with(payload=payl, **done2)
                    yield pkt

        if self.explicit or self.raw_packet_cache is not None:
            todo = []
            done = self.fields
        else:
            todo = [k for (k, v) in itertools.chain(six.iteritems(self.default_fields),  # noqa: E501
                                                    six.iteritems(self.overloaded_fields))  # noqa: E501
                    if isinstance(v, VolatileValue)] + list(self.fields)
            done = {}
        return loop(todo, done)

    def iterpayloads(self):
        # type: () -> Iterator[Packet]
        """Used to iter through the payloads of a Packet.
        Useful for DNS or 802.11 for instance.
        """
        yield self
        current = self
        while current.payload:
            current = current.payload
            yield current

    def __gt__(self, other):
        # type: (Packet) -> int
        """True if other is an answer from self (self ==> other)."""
        if isinstance(other, Packet):
            return other < self
        elif isinstance(other, bytes):
            return 1
        else:
            raise TypeError((self, other))

    def __lt__(self, other):
        # type: (Packet) -> int
        """True if self is an answer from other (other ==> self)."""
        if isinstance(other, Packet):
            return self.answers(other)
        elif isinstance(other, bytes):
            return 1
        else:
            raise TypeError((self, other))

    def __eq__(self, other):
        # type: (Any) -> bool
        if not isinstance(other, self.__class__):
            return False
        for f in self.fields_desc:
            if f not in other.fields_desc:
                return False
            if self.getfieldval(f.name) != other.getfieldval(f.name):
                return False
        return self.payload == other.payload

    def __ne__(self, other):
        # type: (Any) -> bool
        return not self.__eq__(other)

    # Note: setting __hash__ to None is the standard way
    # of making an object un-hashable. mypy doesn't know that
    __hash__ = None  # type: ignore

    def hashret(self):
        # type: () -> bytes
        """DEV: returns a string that has the same value for a request
        and its answer."""
        return self.payload.hashret()

    def answers(self, other):
        # type: (Packet) -> int
        """DEV: true if self is an answer from other"""
        if other.__class__ == self.__class__:
            return self.payload.answers(other.payload)
        return 0

    def layers(self):
        # type: () -> List[Type[Packet]]
        """returns a list of layer classes (including subclasses) in this packet"""  # noqa: E501
        layers = []
        lyr = self  # type: Optional[Packet]
        while lyr:
            layers.append(lyr.__class__)
            lyr = lyr.payload.getlayer(0, _subclass=True)
        return layers

    def haslayer(self, cls, _subclass=None):
        # type: (Union[Type[Packet], str], Optional[bool]) -> int
        """
        true if self has a layer that is an instance of cls.
        Superseded by "cls in self" syntax.
        """
        if _subclass is None:
            _subclass = self.match_subclass or None
        if _subclass:
            match = issubtype
        else:
            match = lambda cls1, cls2: bool(cls1 == cls2)
        if cls is None or match(self.__class__, cls) \
           or cls in [self.__class__.__name__, self._name]:
            return True
        for f in self.packetfields:
            fvalue_gen = self.getfieldval(f.name)
            if fvalue_gen is None:
                continue
            if not f.islist:
                fvalue_gen = SetGen(fvalue_gen, _iterpacket=0)
            for fvalue in fvalue_gen:
                if isinstance(fvalue, Packet):
                    ret = fvalue.haslayer(cls, _subclass=_subclass)
                    if ret:
                        return ret
        return self.payload.haslayer(cls, _subclass=_subclass)

    def getlayer(self,
                 cls,  # type: Union[int, Type[Packet], str]
                 nb=1,  # type: int
                 _track=None,  # type: Optional[List[int]]
                 _subclass=None,  # type: Optional[bool]
                 **flt  # type: Any
                 ):
        # type: (...) -> Optional[Packet]
        """Return the nb^th layer that is an instance of cls, matching flt
values.
        """
        if _subclass is None:
            _subclass = self.match_subclass or None
        if _subclass:
            match = issubtype
        else:
            match = lambda cls1, cls2: bool(cls1 == cls2)
        # Note:
        # cls can be int, packet, str
        # string_class_name can be packet, str (packet or packet+field)
        # class_name can be packet, str (packet only)
        if isinstance(cls, int):
            nb = cls + 1
            string_class_name = ""  # type: Union[Type[Packet], str]
        else:
            string_class_name = cls
        class_name = ""  # type: Union[Type[Packet], str]
        fld = None  # type: Optional[str]
        if isinstance(string_class_name, str) and "." in string_class_name:
            class_name, fld = string_class_name.split(".", 1)
        else:
            class_name, fld = string_class_name, None
        if not class_name or match(self.__class__, class_name) \
           or class_name in [self.__class__.__name__, self._name]:
            if all(self.getfieldval(fldname) == fldvalue
                   for fldname, fldvalue in six.iteritems(flt)):
                if nb == 1:
                    if fld is None:
                        return self
                    else:
                        return self.getfieldval(fld)  # type: ignore
                else:
                    nb -= 1
        for f in self.packetfields:
            fvalue_gen = self.getfieldval(f.name)
            if fvalue_gen is None:
                continue
            if not f.islist:
                fvalue_gen = SetGen(fvalue_gen, _iterpacket=0)
            for fvalue in fvalue_gen:
                if isinstance(fvalue, Packet):
                    track = []  # type: List[int]
                    ret = fvalue.getlayer(class_name, nb=nb, _track=track,
                                          _subclass=_subclass, **flt)
                    if ret is not None:
                        return ret
                    nb = track[0]
        return self.payload.getlayer(class_name, nb=nb, _track=_track,
                                     _subclass=_subclass, **flt)

    def firstlayer(self):
        # type: () -> Packet
        q = self
        while q.underlayer is not None:
            q = q.underlayer
        return q

    def __getitem__(self, cls):
        # type: (Union[Type[Packet], str]) -> Any
        if isinstance(cls, slice):
            lname = cls.start
            if cls.stop:
                ret = self.getlayer(cls.start, nb=cls.stop, **(cls.step or {}))
            else:
                ret = self.getlayer(cls.start, **(cls.step or {}))
        else:
            lname = cls
            ret = self.getlayer(cls)
        if ret is None:
            if isinstance(lname, type):
                name = lname.__name__
            elif not isinstance(lname, bytes):
                name = repr(lname)
            else:
                name = cast(str, lname)
            raise IndexError("Layer [%s] not found" % name)
        return ret

    def __delitem__(self, cls):
        # type: (Type[Packet]) -> None
        del(self[cls].underlayer.payload)

    def __setitem__(self, cls, val):
        # type: (Type[Packet], Packet) -> None
        self[cls].underlayer.payload = val

    def __contains__(self, cls):
        # type: (Union[Type[Packet], str]) -> int
        """
        "cls in self" returns true if self has a layer which is an
        instance of cls.
        """
        return self.haslayer(cls)

    def route(self):
        # type: () -> Tuple[Optional[str], Optional[str], Optional[str]]
        return self.payload.route()

    def fragment(self, *args, **kargs):
        # type: (*Any, **Any) -> List[Packet]
        return self.payload.fragment(*args, **kargs)

    def display(self, *args, **kargs):  # Deprecated. Use show()
        # type: (*Any, **Any) -> None
        """Deprecated. Use show() method."""
        self.show(*args, **kargs)

    def _show_or_dump(self,
                      dump=False,  # type: bool
                      indent=3,  # type: int
                      lvl="",  # type: str
                      label_lvl="",  # type: str
                      first_call=True  # type: bool
                      ):
        # type: (...) -> Optional[str]
        """
        Internal method that shows or dumps a hierarchical view of a packet.
        Called by show.

        :param dump: determine if it prints or returns the string value
        :param int indent: the size of indentation for each layer
        :param str lvl: additional information about the layer lvl
        :param str label_lvl: additional information about the layer fields
        :param first_call: determine if the current function is the first
        :return: return a hierarchical view if dump, else print it
        """

        if dump:
            from scapy.themes import AnsiColorTheme
            ct = AnsiColorTheme()  # No color for dump output
        else:
            ct = conf.color_theme
        s = "%s%s %s %s \n" % (label_lvl,
                               ct.punct("###["),
                               ct.layer_name(self.name),
                               ct.punct("]###"))
        for f in self.fields_desc:
            if isinstance(f, ConditionalField) and not f._evalcond(self):
                continue
            if isinstance(f, Emph) or f in conf.emph:
                ncol = ct.emph_field_name
                vcol = ct.emph_field_value
            else:
                ncol = ct.field_name
                vcol = ct.field_value
            fvalue = self.getfieldval(f.name)
            if isinstance(fvalue, Packet) or (f.islist and f.holds_packets and isinstance(fvalue, list)):  # noqa: E501
                pad = max(0, 10 - len(f.name)) * " "
                s += "%s  \\%s%s\\\n" % (label_lvl + lvl, ncol(f.name), pad)
                fvalue_gen = SetGen(
                    fvalue,
                    _iterpacket=0
                )  # type: SetGen[Packet]
                for fvalue in fvalue_gen:
                    s += fvalue._show_or_dump(dump=dump, indent=indent, label_lvl=label_lvl + lvl + "   |", first_call=False)  # noqa: E501
            else:
                pad = max(0, 10 - len(f.name)) * " "
                begn = "%s  %s%s%s " % (label_lvl + lvl,
                                        ncol(f.name),
                                        pad,
                                        ct.punct("="),)
                reprval = f.i2repr(self, fvalue)
                if isinstance(reprval, str):
                    reprval = reprval.replace("\n", "\n" + " " * (len(label_lvl) +  # noqa: E501
                                                                  len(lvl) +
                                                                  len(f.name) +
                                                                  4))
                s += "%s%s\n" % (begn, vcol(reprval))
        if self.payload:
            s += self.payload._show_or_dump(  # type: ignore
                dump=dump,
                indent=indent,
                lvl=lvl + (" " * indent * self.show_indent),
                label_lvl=label_lvl,
                first_call=False
            )

        if first_call and not dump:
            print(s)
            return None
        else:
            return s

    def show(self, dump=False, indent=3, lvl="", label_lvl=""):
        # type: (bool, int, str, str) -> Optional[Any]
        """
        Prints or returns (when "dump" is true) a hierarchical view of the
        packet.

        :param dump: determine if it prints or returns the string value
        :param int indent: the size of indentation for each layer
        :param str lvl: additional information about the layer lvl
        :param str label_lvl: additional information about the layer fields
        :return: return a hierarchical view if dump, else print it
        """
        return self._show_or_dump(dump, indent, lvl, label_lvl)

    def show2(self, dump=False, indent=3, lvl="", label_lvl=""):
        # type: (bool, int, str, str) -> Optional[Any]
        """
        Prints or returns (when "dump" is true) a hierarchical view of an
        assembled version of the packet, so that automatic fields are
        calculated (checksums, etc.)

        :param dump: determine if it prints or returns the string value
        :param int indent: the size of indentation for each layer
        :param str lvl: additional information about the layer lvl
        :param str label_lvl: additional information about the layer fields
        :return: return a hierarchical view if dump, else print it
        """
        return self.__class__(raw(self)).show(dump, indent, lvl, label_lvl)

    def sprintf(self, fmt, relax=1):
        # type: (str, int) -> str
        """
        sprintf(format, [relax=1]) -> str

        Where format is a string that can include directives. A directive
        begins and ends by % and has the following format:
        ``%[fmt[r],][cls[:nb].]field%``

        :param fmt: is a classic printf directive, "r" can be appended for raw
          substitution:
          (ex: IP.flags=0x18 instead of SA), nb is the number of the layer
          (ex: for IP/IP packets, IP:2.src is the src of the upper IP layer).
          Special case : "%.time%" is the creation time.
          Ex::

            p.sprintf(
              "%.time% %-15s,IP.src% -> %-15s,IP.dst% %IP.chksum% "
              "%03xr,IP.proto% %r,TCP.flags%"
            )

          Moreover, the format string can include conditional statements. A
          conditional statement looks like : {layer:string} where layer is a
          layer name, and string is the string to insert in place of the
          condition if it is true, i.e. if layer is present. If layer is
          preceded by a "!", the result is inverted. Conditions can be
          imbricated. A valid statement can be::

            p.sprintf("This is a{TCP: TCP}{UDP: UDP}{ICMP:n ICMP} packet")
            p.sprintf("{IP:%IP.dst% {ICMP:%ICMP.type%}{TCP:%TCP.dport%}}")

          A side effect is that, to obtain "{" and "}" characters, you must use
          "%(" and "%)".
        """

        escape = {"%": "%",
                  "(": "{",
                  ")": "}"}

        # Evaluate conditions
        while "{" in fmt:
            i = fmt.rindex("{")
            j = fmt[i + 1:].index("}")
            cond = fmt[i + 1:i + j + 1]
            k = cond.find(":")
            if k < 0:
                raise Scapy_Exception("Bad condition in format string: [%s] (read sprintf doc!)" % cond)  # noqa: E501
            cond, format_ = cond[:k], cond[k + 1:]
            res = False
            if cond[0] == "!":
                res = True
                cond = cond[1:]
            if self.haslayer(cond):
                res = not res
            if not res:
                format_ = ""
            fmt = fmt[:i] + format_ + fmt[i + j + 2:]

        # Evaluate directives
        s = ""
        while "%" in fmt:
            i = fmt.index("%")
            s += fmt[:i]
            fmt = fmt[i + 1:]
            if fmt and fmt[0] in escape:
                s += escape[fmt[0]]
                fmt = fmt[1:]
                continue
            try:
                i = fmt.index("%")
                sfclsfld = fmt[:i]
                fclsfld = sfclsfld.split(",")
                if len(fclsfld) == 1:
                    f = "s"
                    clsfld = fclsfld[0]
                elif len(fclsfld) == 2:
                    f, clsfld = fclsfld
                else:
                    raise Scapy_Exception
                if "." in clsfld:
                    cls, fld = clsfld.split(".")
                else:
                    cls = self.__class__.__name__
                    fld = clsfld
                num = 1
                if ":" in cls:
                    cls, snum = cls.split(":")
                    num = int(snum)
                fmt = fmt[i + 1:]
            except Exception:
                raise Scapy_Exception("Bad format string [%%%s%s]" % (fmt[:25], fmt[25:] and "..."))  # noqa: E501
            else:
                if fld == "time":
                    val = time.strftime(
                        "%H:%M:%S.%%06i",
                        time.localtime(float(self.time))
                    ) % int((self.time - int(self.time)) * 1000000)
                elif cls == self.__class__.__name__ and hasattr(self, fld):
                    if num > 1:
                        val = self.payload.sprintf("%%%s,%s:%s.%s%%" % (f, cls, num - 1, fld), relax)  # noqa: E501
                        f = "s"
                    else:
                        try:
                            val = self.getfieldval(fld)
                        except AttributeError:
                            val = getattr(self, fld)
                        if f[-1] == "r":  # Raw field value
                            f = f[:-1]
                            if not f:
                                f = "s"
                        else:
                            if fld in self.fieldtype:
                                val = self.fieldtype[fld].i2repr(self, val)
                else:
                    val = self.payload.sprintf("%%%s%%" % sfclsfld, relax)
                    f = "s"
                s += ("%" + f) % val

        s += fmt
        return s

    def mysummary(self):
        # type: () -> str
        """DEV: can be overloaded to return a string that summarizes the layer.
           Only one mysummary() is used in a whole packet summary: the one of the upper layer,  # noqa: E501
           except if a mysummary() also returns (as a couple) a list of layers whose  # noqa: E501
           mysummary() must be called if they are present."""
        return ""

    def _do_summary(self):
        # type: () -> Tuple[int, str, List[Any]]
        found, s, needed = self.payload._do_summary()
        ret = ""
        if not found or self.__class__ in needed:
            ret = self.mysummary()
            if isinstance(ret, tuple):
                ret, n = ret
                needed += n
        if ret or needed:
            found = 1
        if not ret:
            ret = self.__class__.__name__ if self.show_summary else ""
        if self.__class__ in conf.emph:
            impf = []
            for f in self.fields_desc:
                if f in conf.emph:
                    impf.append("%s=%s" % (f.name, f.i2repr(self, self.getfieldval(f.name))))  # noqa: E501
            ret = "%s [%s]" % (ret, " ".join(impf))
        if ret and s:
            ret = "%s / %s" % (ret, s)
        else:
            ret = "%s%s" % (ret, s)
        return found, ret, needed

    def summary(self, intern=0):
        # type: (int) -> str
        """Prints a one line summary of a packet."""
        return self._do_summary()[1]

    def lastlayer(self, layer=None):
        # type: (Optional[Packet]) -> Packet
        """Returns the uppest layer of the packet"""
        return self.payload.lastlayer(self)

    def decode_payload_as(self, cls):
        # type: (Type[Packet]) -> None
        """Reassembles the payload and decode it using another packet class"""
        s = raw(self.payload)
        self.payload = cls(s, _internal=1, _underlayer=self)
        pp = self
        while pp.underlayer is not None:
            pp = pp.underlayer
        self.payload.dissection_done(pp)

    def command(self):
        # type: () -> str
        """
        Returns a string representing the command you have to type to
        obtain the same packet
        """
        f = []
        for fn, fv in six.iteritems(self.fields):
            fld = self.get_field(fn)
            if isinstance(fv, (list, dict, set)) and len(fv) == 0:
                continue
            if isinstance(fv, Packet):
                fv = fv.command()
            elif fld.islist and fld.holds_packets and isinstance(fv, list):
                fv = "[%s]" % ",".join(map(Packet.command, fv))
            elif isinstance(fld, FlagsField):
                fv = int(fv)
            elif callable(getattr(fv, 'command', None)):
                fv = fv.command()
            else:
                fv = repr(fv)
            f.append("%s=%s" % (fn, fv))
        c = "%s(%s)" % (self.__class__.__name__, ", ".join(f))
        pc = self.payload.command()
        if pc:
            c += "/" + pc
        return c @conf.commands.register
def bind_layers(lower,  # type: Type[Packet]
                upper,  # type: Type[Packet]
                __fval=None,  # type: Optional[Dict[str, int]]
                **fval  # type: Any
                ):
    # type: (...) -> None
    """Bind 2 layers on some specific fields' values.

    It makes the packet being built and dissected when the arguments
    are present.

    This function calls both bind_bottom_up and bind_top_down, with
    all passed arguments.

    Please have a look at their docs:
     - help(bind_bottom_up)
     - help(bind_top_down)
     """
    if __fval is not None:
        fval.update(__fval)
    bind_top_down(lower, upper, **fval)
    bind_bottom_up(lower, upper, **fval) class NoPayload(Packet):
    def __new__(cls, *args, **kargs):
        # type: (Type[Packet], *Any, **Any) -> Packet
        singl = cls.__dict__.get("__singl__")
        if singl is None:
            cls.__singl__ = singl = Packet.__new__(cls)
            Packet.__init__(singl)
        return singl

    def __init__(self, *args, **kargs):
        # type: (*Any, **Any) -> None
        pass

    def dissection_done(self, pkt):
        # type: (Packet) -> None
        pass

    def add_payload(self, payload):
        # type: (Union[Packet, bytes]) -> NoReturn
        raise Scapy_Exception("Can't add payload to NoPayload instance")

    def remove_payload(self):
        # type: () -> None
        pass

    def add_underlayer(self, underlayer):
        # type: (Any) -> None
        pass

    def remove_underlayer(self, other):
        # type: (Packet) -> None
        pass

    def copy(self):
        # type: () -> NoPayload
        return self

    def clear_cache(self):
        # type: () -> None
        pass

    def __repr__(self):
        # type: () -> str
        return ""

    def __str__(self):
        # type: () -> str
        return ""

    def __bytes__(self):
        # type: () -> bytes
        return b""

    def __nonzero__(self):
        # type: () -> bool
        return False
    __bool__ = __nonzero__

    def do_build(self):
        # type: () -> bytes
        return b""

    def build(self):
        # type: () -> bytes
        return b""

    def build_padding(self):
        # type: () -> bytes
        return b""

    def build_done(self, p):
        # type: (bytes) -> bytes
        return p

    def build_ps(self, internal=0):
        # type: (int) -> Tuple[bytes, List[Any]]
        return b"", []

    def getfieldval(self, attr):
        # type: (str) -> NoReturn
        raise AttributeError(attr)

    def getfield_and_val(self, attr):
        # type: (str) -> NoReturn
        raise AttributeError(attr)

    def setfieldval(self, attr, val):
        # type: (str, Any) -> NoReturn
        raise AttributeError(attr)

    def delfieldval(self, attr):
        # type: (str) -> NoReturn
        raise AttributeError(attr)

    def hide_defaults(self):
        # type: () -> None
        pass

    def __iter__(self):
        # type: () -> Iterator[Packet]
        return iter([])

    def __eq__(self, other):
        # type: (Any) -> bool
        if isinstance(other, NoPayload):
            return True
        return False

    def hashret(self):
        # type: () -> bytes
        return b""

    def answers(self, other):
        # type: (NoPayload) -> bool
        return isinstance(other, (NoPayload, conf.padding_layer))  # noqa: E501

    def haslayer(self, cls, _subclass=None):
        # type: (Union[Type[Packet], str], Optional[bool]) -> int
        return 0

    def getlayer(self,
                 cls,  # type: Union[int, Type[Packet], str]
                 nb=1,  # type: int
                 _track=None,  # type: Optional[List[int]]
                 _subclass=None,  # type: Optional[bool]
                 **flt  # type: Any
                 ):
        # type: (...) -> Optional[Packet]
        if _track is not None:
            _track.append(nb)
        return None

    def fragment(self, *args, **kargs):
        # type: (*Any, **Any) -> List[Packet]
        raise Scapy_Exception("cannot fragment this packet")

    def show(self, dump=False, indent=3, lvl="", label_lvl=""):
        # type: (bool, int, str, str) -> None
        pass

    def sprintf(self, fmt, relax=1):
        # type: (str, int) -> str
        if relax:
            return "??"
        else:
            raise Scapy_Exception("Format not found [%s]" % fmt)

    def _do_summary(self):
        # type: () -> Tuple[int, str, List[Any]]
        return 0, "", []

    def layers(self):
        # type: () -> List[Type[Packet]]
        return []

    def lastlayer(self, layer=None):
        # type: (Optional[Packet]) -> Packet
        return layer or self

    def command(self):
        # type: () -> str
        return ""

    def route(self):
        # type: () -> Tuple[None, None, None]
        return (None, None, None) class ConfClass(object):
class Interceptor(object):
class ProgPath(ConfClass):
class ConfigFieldList:
class Emphasize(ConfigFieldList):
class Resolve(ConfigFieldList):
class Num2Layer:
class LayersList(List[Type['scapy.packet.Packet']]):
class CommandsList(List[Callable[..., Any]]):
class CacheInstance(Dict[str, Any], object):
class NetCache:
class Conf(ConfClass):
    def configure(self, cnf):
    def __repr__(self):
    def __str__(self):
    def __init__(self,
                 name,  # type: str
                 default,  # type: Any
                 hook,  # type: Callable[..., Any]
                 args=None,  # type: Optional[List[Any]]
                 kargs=None  # type: Optional[Dict[str, Any]]
                 ):
    def __get__(self, obj, typ=None):
    def set_from_hook(obj, name, val):
    def __set__(self, obj, val):
def _readonly(name):
    def __init__(self):
    def _is_field(f):
    def _recalc_layer_list(self):
    def add(self, *flds):
    def remove(self, *flds):
    def __contains__(self, elt):
    def __repr__(self):
    def __init__(self):
    def register(self, num, layer):
    def register_num2layer(self, num, layer):
    def register_layer2num(self, num, layer):
    def __getitem__(self, item):
    def __contains__(self, item):
    def get(self,
            item,  # type: Union[int, Type[Packet]]
            default=None,  # type: Optional[Type[Packet]]
            ):
    def __repr__(self):
    def __init__(self):
    def __repr__(self):
    def register(self, layer):
    def layers(self):
    def filter(self, items):
    def unfilter(self):
    def __repr__(self):
    def register(self, cmd):
def lsc():
    def __init__(self, name="noname", timeout=None):
    def flush(self):
    def __getitem__(self, item):
    def get(self, item, default=None):
    def __setitem__(self, item, v):
    def update(self,  # type: ignore
               other,  # type: Any
               **kwargs  # type: Any
               ):
    def iteritems(self):
    def iterkeys(self):
    def __iter__(self):
    def itervalues(self):
    def items(self):
    def keys(self):
    def values(self):
    def __len__(self):
    def summary(self):
    def __repr__(self):
    def copy(self):
    def __init__(self):
    def add_cache(self, cache):
    def new_cache(self, name, timeout=None):
    def __delattr__(self, attr):
    def update(self, other):
    def flush(self):
    def __repr__(self):
def _version_checker(module, minver):
def isCryptographyValid():
def isCryptographyAdvanced():
def isPyPy():
def _prompt_changer(attr, val, old):
def _set_conf_sockets():
def _socket_changer(attr, val, old):
def _loglevel_changer(attr, val, old):
def _iface_changer(attr, val, old):
    def __getattribute__(self, attr):
def crypto_validator(func):
    def func_in(*args, **kwargs):
def scapy_delete_temp_files(): class PeriodicSenderThread(threading.Thread):
    def __init__(self, sock, pkt, interval=0.5):
        # type: (Any, _PacketIterable, float) -> None
        """ Thread to send packets periodically

        Args:
            sock: socket where packet is sent periodically
            pkt: packet or list of packets to send
            interval: interval between two packets
        """
        if not isinstance(pkt, list):
            self._pkts = [cast("Packet", pkt)]  # type: _PacketIterable
        else:
            self._pkts = pkt
        self._socket = sock
        self._stopped = threading.Event()
        self._interval = interval
        threading.Thread.__init__(self)

    def run(self):
        # type: () -> None
        while not self._stopped.is_set() and not self._socket.closed:
            for p in self._pkts:
                self._socket.send(p)
                time.sleep(self._interval)
                if self._stopped.is_set() or self._socket.closed:
                    break

    def stop(self):
        # type: () -> None
        self._stopped.set()
        self.join(self._interval * 2)     FAKE_TYPING = False
    FAKE_TYPING = True
    TYPE_CHECKING = False
    IO = _FakeType("IO")  # type: ignore
        AF_INET = socket.AF_INET
        AF_INET6 = socket.AF_INET6
class _Generic_metaclass(type):
    class _FT(object):
    class Sized(object):  # type: ignore
    class Generic(object):  # type: ignore
        class _NT(cls):
    class AddressFamily:
        def __getitem__(self, typ):
def _FakeType(name, cls=object):
        def __init__(self, name):
        def __getitem__(self, item):  # type: ignore
        def __call__(self, *args, **kargs):
        def __repr__(self):
    def cast(_type, obj):  # type: ignore
    def _unpickleNamedTuple(name, len_params, *args):
    def NamedTuple(name, params):
            def __reduce__(self):
def lambda_tuple_converter(func):
    def chb(x):
    def raw(x):
    def raw(x):
    def bytes_encode(x):
        def plain_str(x):
        def plain_str(x):
    def chb(x):
    def orb(x):
def bytes_hex(x):
def hex_bytes(x):
    def int_bytes(x, size):
    def bytes_int(x):
    def int_bytes(x, size):
    def bytes_int(x):
def base64_bytes(x):
def bytes_base64(x):
    def gzip_decompress(x):
    def gzip_compress(x):
import struct
import time
from scapy.fields import ByteEnumField, StrField, ConditionalField, \
    BitEnumField, BitField, XByteField, FieldListField, \
    XShortField, X3BytesField, XIntField, ByteField, \
    ShortField, ObservableDict, XShortEnumField, XByteEnumField, StrLenField, \
    FieldLenField, XStrFixedLenField, XStrLenField
from scapy.packet import Packet, bind_layers, NoPayload
from scapy.config import conf
from scapy.error import log_loading, log_interactive, Scapy_Exception
from scapy.utils import PeriodicSenderThread
from scapy.contrib.isotp import ISOTP
from scapy.compat import Dict, Union
                         length_from=lambda p:
                         p.fileSizeOrDirInfoParameterLength),
                         lambda p: p.modeOfOperation not in [1, 2, 3, 5]),
    ]

    def answers(self, other):
        return isinstance(other, UDS_RFT)


bind_layers(UDS, UDS_RFTPR, service=0x78)


# #########################IOCBI###################################
class UDS_IOCBI(Packet):
    name = 'InputOutputControlByIdentifier'
    dataIdentifiers = ObservableDict()
    fields_desc = [
        XShortEnumField('dataIdentifier', 0, dataIdentifiers),
        ByteField('controlOptionRecord', 0),
        StrField('controlEnableMaskRecord', b"", fmt="B")
    ]


bind_layers(UDS, UDS_IOCBI, service=0x2F)


class UDS_IOCBIPR(Packet):
    name = 'InputOutputControlByIdentifierPositiveResponse'
    fields_desc = [
        XShortField('dataIdentifier', 0),
        StrField('controlStatusRecord', b"", fmt="B")
    ]

    def answers(self, other):
        return isinstance(other, UDS_IOCBI) \
            and other.dataIdentifier == self.dataIdentifier


bind_layers(UDS, UDS_IOCBIPR, service=0x6F)


# #########################NR###################################
class UDS_NR(Packet):
    negativeResponseCodes = {
        0x00: 'positiveResponse',
        0x10: 'generalReject',
        0x11: 'serviceNotSupported',
        0x12: 'subFunctionNotSupported',
        0x13: 'incorrectMessageLengthOrInvalidFormat',
        0x14: 'responseTooLong',
        0x20: 'ISOSAEReserved',
        0x21: 'busyRepeatRequest',
        0x22: 'conditionsNotCorrect',
        0x23: 'ISOSAEReserved',
        0x24: 'requestSequenceError',
        0x25: 'noResponseFromSubnetComponent',
        0x26: 'failurePreventsExecutionOfRequestedAction',
        0x31: 'requestOutOfRange',
        0x33: 'securityAccessDenied',
        0x35: 'invalidKey',
        0x36: 'exceedNumberOfAttempts',
        0x37: 'requiredTimeDelayNotExpired',
        0x3A: 'secureDataVerificationFailed',
        0x70: 'uploadDownloadNotAccepted',
        0x71: 'transferDataSuspended',
        0x72: 'generalProgrammingFailure',
        0x73: 'wrongBlockSequenceCounter',
        0x78: 'requestCorrectlyReceived-ResponsePending',
        0x7E: 'subFunctionNotSupportedInActiveSession',
        0x7F: 'serviceNotSupportedInActiveSession',
        0x80: 'ISOSAEReserved',
        0x81: 'rpmTooHigh',
        0x82: 'rpmTooLow',
        0x83: 'engineIsRunning',
        0x84: 'engineIsNotRunning',
        0x85: 'engineRunTimeTooLow',
        0x86: 'temperatureTooHigh',
        0x87: 'temperatureTooLow',
        0x88: 'vehicleSpeedTooHigh',
        0x89: 'vehicleSpeedTooLow',
        0x8a: 'throttle/PedalTooHigh',
        0x8b: 'throttle/PedalTooLow',
        0x8c: 'transmissionRangeNotInNeutral',
        0x8d: 'transmissionRangeNotInGear',
        0x8e: 'ISOSAEReserved',
        0x8f: 'brakeSwitch(es)NotClosed',
        0x90: 'shifterLeverNotInPark',
        0x91: 'torqueConverterClutchLocked',
        0x92: 'voltageTooHigh',
        0x93: 'voltageTooLow',
    }
    name = 'NegativeResponse'
    fields_desc = [
        XByteEnumField('requestServiceId', 0, UDS.services),
        ByteEnumField('negativeResponseCode', 0, negativeResponseCodes)
    ]

    def answers(self, other):
        return self.requestServiceId == other.service and \
            (self.negativeResponseCode != 0x78 or
             conf.contribs['UDS']['treat-response-pending-as-answer'])


bind_layers(UDS, UDS_NR, service=0x7f)


# ##################################################################
# ######################## UTILS ###################################
# ##################################################################


class UDS_TesterPresentSender(PeriodicSenderThread):
    def __init__(self, sock, pkt=UDS() / UDS_TP(), interval=2):
        """ Thread to send TesterPresent messages packets periodically

        Args:
            sock: socket where packet is sent periodically
            pkt: packet to send
            interval: interval between two packets
        """

        PeriodicSenderThread.__init__(self, sock, pkt, interval)