Scapy设置类属性问题

发布于 2024-11-25 12:50:56 字数 805 浏览 0 评论 0原文

我正在使用 scapy，并且有一个与 scapy 和 python 相关的问题。我尝试使用变量作为 scapy 字段名称。这是一段代码摘录，应该说明我尝试做的事情（它不起作用）：

class Test(Packet):
    name = "Test23"
    def __init__(self,foo=None):
        self.foo=foo

    fields_desc = [
                BitField(self.foo, 0x0, 4),
                BitField("bar", 0x3, 4)
                ]

现在我想问题是由于 fields_desc 是类属性而不是类变量这一事实造成的。现在，我怎样才能达到我想要的呢？（在运行时/类初始化时设置 self.foo 的名称？）

如果有任何帮助，我将不胜感激。致以最诚挚的问候

编辑：附加一个计数器就足够了。我尝试过：

class Counter:
     count = 0    
     def __init__(self):
         self.__class__.count += 1 
     foo = [ 
            "lala"+str(count)
            ]   
     print foo 


a=Counter()
a.count
print a.foo
b=Counter()
b.count
print b.foo

但似乎不起作用。如果你能给我指出正确的方向那就太好了，不知何故我迷路了。

原文

I'm working with scapy and have a question related to scapy but also python. I try to use variables as scapy field-names. Here is an extract of code that should illustrate what I try to do (It is not working):

class Test(Packet):
    name = "Test23"
    def __init__(self,foo=None):
        self.foo=foo

    fields_desc = [
                BitField(self.foo, 0x0, 4),
                BitField("bar", 0x3, 4)
                ]

Now I imagine the problem is due to the fact that fields_desc is a class attribute and not a class variable. Now, how could I reach what I want? (setting the name of self.foo at runtime/class inizialisation?)

I would be thankfull for any help.
With best regards

Edit: Appending an counter would be enough. I tried:

class Counter:
     count = 0    
     def __init__(self):
         self.__class__.count += 1 
     foo = [ 
            "lala"+str(count)
            ]   
     print foo 


a=Counter()
a.count
print a.foo
b=Counter()
b.count
print b.foo

But doesn't seem to work. Would be cool if you could point me to the correct direction, somehow I'm lost.

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动听の歌 2024-12-02 12:50:56

我认为类属性是在类构造函数运行之前初始化的，因此在创建 fields_desc 时尚未分配 self.foo 。尝试将 fields_desc 声明为空数组，并在 __init__ 函数内将 BitField 对象附加到其中。

我不知道您继承的 Packet 类是如何工作的，但您可能还想查看 super() 函数。

编辑：也许您正在寻找类似的东西？

class Counter:
    i = 0
    foo = []
    def count(self):
        self.__class__.i += 1
        self.__class__.foo.append(['lala' + str(self.__class__.i)])

a = Counter()
a.count()
print Counter().foo
b = Counter()
b.count()
print Counter().foo

在此处输出

[['lala1']]
[['lala1'], ['lala2']]

有关类变量的更多信息

I think class attributes are initialized before the class constructor runs, so self.foo has not been assigned when fields_desc is created. Try declaring fields_desc as an empty array and appending the BitField objects to it inside your __init__ function.

I don't know how the Packet class you're inheriting from works, but you may also want to look at the super() function.

Edit: Maybe you're looking for something like this?

class Counter:
    i = 0
    foo = []
    def count(self):
        self.__class__.i += 1
        self.__class__.foo.append(['lala' + str(self.__class__.i)])

a = Counter()
a.count()
print Counter().foo
b = Counter()
b.count()
print Counter().foo

Output