Coverage for /pythoncovmergedfiles/medio/medio/usr/local/lib/python3.11/site-packages/scapy/asn1packet.py: 86%

1# SPDX-License-Identifier: GPL-2.0-only 

2# This file is part of Scapy 

3# See https://scapy.net/ for more information 

4# Copyright (C) Philippe Biondi <phil@secdev.org> 

5 

6""" 

7ASN.1 Packet 

8 

9Packet holding data in Abstract Syntax Notation (ASN.1). 

10""" 

11 

12from scapy.base_classes import Packet_metaclass 

13from scapy.packet import Packet 

14 

15from typing import ( 

16 Any, 

17 Dict, 

18 Tuple, 

19 Type, 

20 cast, 

21 TYPE_CHECKING, 

22) 

23 

24if TYPE_CHECKING: 

25 from scapy.asn1fields import ASN1F_field # noqa: F401 

26 

27 

28class ASN1Packet_metaclass(Packet_metaclass): 

29 def __new__(cls, 

30 name, # type: str 

31 bases, # type: Tuple[type, ...] 

32 dct # type: Dict[str, Any] 

33 ): 

34 # type: (...) -> Type[ASN1_Packet] 

35 if dct["ASN1_root"] is not None: 

36 dct["fields_desc"] = dct["ASN1_root"].get_fields_list() 

37 return cast( 

38 'Type[ASN1_Packet]', 

39 super(ASN1Packet_metaclass, cls).__new__(cls, name, bases, dct), 

40 ) 

41 

42 

43class ASN1_Packet(Packet, metaclass=ASN1Packet_metaclass): 

44 ASN1_root = cast('ASN1F_field[Any, Any]', None) 

45 ASN1_codec = None 

46 

47 def self_build(self): 

48 # type: () -> bytes 

49 if self.raw_packet_cache is not None: 

50 return self.raw_packet_cache 

51 return self.ASN1_root.build(self) 

52 

53 def do_dissect(self, x): 

54 # type: (bytes) -> bytes 

55 return self.ASN1_root.dissect(self, x)