相关疑难解决方法(0)

我正在尝试使用指定新的数据包格式scapy.在数据包中有一个项目列表,项目由"分组字段"组成."分组字段"是指不同类型的字段的子序列.在scapy中创建我所知道的"分组字段"的唯一方法是使用Packet类和使用FieldLenField/ PacketListField来引用序列的长度和列表成员的类型.这是要走的路吗？看起来像这样的东西:

from scapy.packet import Packet
from scapy.fields import *

class RepeatingGroupedSequence(Packet):
    name = "Simple group of two fields"

    fields_desc = [IntField('field1', 1), 
                   IntField('field2', 2)]

class TopLayer(Packet):
    name = "Storage for Repeating Sequence"

    fields_desc = [FieldLenField("length", None, count_of='rep_seq'),
                   PacketListField('rep_seq', None, RepeatingGroupedSequence, 
                                   count_from = lambda pkt: pkt.length),
                  ]

#Now here is the problem that I have with assembling PacketListField: 

#craft TopLayer packet
p = TopLayer()

#add two "repeated sequences"
p.rep_seq = [ RepeatingGroupedSequence(), RepeatingGroupedSequence() …