Class _DNSPacketListField

scapy/layers/dns.py:1236–1269

class _DNSPacketListField(PacketListField):
    # A normal PacketListField with backward-compatible hacks
    def any2i(self, pkt, x):
        # type: (Optional[Packet], List[Any]) -> List[Any]
        if x is None:
            warnings.warn(
                ("The DNS fields 'qd', 'an', 'ns' and 'ar' are now "
                 "PacketListField(s) ! "
                 "Setting a null default should be [] instead of None"),
                DeprecationWarning
            )
            x = []
        return super(_DNSPacketListField, self).any2i(pkt, x)

    def i2h(self, pkt, x):
        # type: (Optional[Packet], List[Packet]) -> Any
        class _list(list):
            """
            Fake list object to provide compatibility with older DNS fields
            """
            def __getattr__(self, attr):
                try:
                    ret = getattr(self[0], attr)
                    warnings.warn(
                        ("The DNS fields 'qd', 'an', 'ns' and 'ar' are now "
                         "PacketListField(s) ! "
                         "To access the first element, use pkt.an[0] instead of "
                         "pkt.an"),
                        DeprecationWarning
                    )
                    return ret
                except AttributeError:
                    raise
        return _list(x)


class DNS(DNSCompressedPacket):