AttributeError：'NoneType'对象没有属性'split'错误

Question

我正在运行此代码以寻求arp请求和以太币。当我运行它时，它会给我消息

 Traceback (most recent call last):
  File "network_scanner.py", line 16, in <module>
    scan('10.0.2.1/24')
  File "network_scanner.py", line 8, in scan
    arp_request.show()
  File "/usr/local/lib/python2.7/dist-packages/scapy-2.4.3- 
   py2.7.egg/scapy/packet.py", line 1261, in show
    return self._show_or_dump(dump, indent, lvl, label_lvl)
  File "/usr/local/lib/python2.7/dist-packages/scapy-2.4.3- 
   py2.7.egg/scapy/packet.py", line 1235, in _show_or_dump
    reprval = f.i2repr(self, fvalue)
  File "/usr/local/lib/python2.7/dist-packages/scapy-2.4.3- 
   py2.7.egg/scapy/fields.py", line 376, in i2repr
    return fld.i2repr(pkt, val)
  File "/usr/local/lib/python2.7/dist-packages/scapy-2.4.3- 
   py2.7.egg/scapy/fields.py", line 502, in i2repr
    x = self.i2h(pkt, x)
  File "/usr/local/lib/python2.7/dist-packages/scapy-2.4.3- 
   py2.7.egg/scapy/layers/l2.py", line 136, in i2h
    iff = self.getif(pkt)
  File "/usr/local/lib/python2.7/dist-packages/scapy-2.4.3- 
   py2.7.egg/scapy/layers/l2.py", line 132, in <lambda>
    self.getif = (lambda pkt: pkt.route()[0]) if getif is None else getif
  File "/usr/local/lib/python2.7/dist-packages/scapy-2.4.3- 
   py2.7.egg/scapy/layers/l2.py", line 400, in route
    fld, dst = fld._find_fld_pkt_val(self, dst)
  File "/usr/local/lib/python2.7/dist-packages/scapy-2.4.3- 
   py2.7.egg/scapy/fields.py", line 313, in _find_fld_pkt_val
    if val == dflts_pkt[self.name] and self.name not in pkt.fields:
  File "/usr/local/lib/python2.7/dist-packages/scapy-2.4.3- 
   py2.7.egg/scapy/base_classes.py", line 133, in __eq__
    p2, nm2 = self._parse_net(other)
  File "/usr/local/lib/python2.7/dist-packages/scapy-2.4.3- 
   py2.7.egg/scapy/base_classes.py", line 99, in _parse_net
    tmp = net.split('/') + ["32"]
    AttributeError: 'NoneType' object has no attribute 'split'

我下载了错误的内容还是输入错误？有没有简单的解决方法，我对这种东西还很陌生，所以我想增加自己的知识。我正在运行的代码如下

#!/usr/bin/env python

import scapy.all as scapy

def scan(ip):
    arp_request = scapy.ARP(pdst=ip)
    arp_request.show()
    broadcast = scapy.Ether(dst='ff:ff:ff:ff:ff:ff')
    broadcast.show()
    arp_request_broadcast = broadcast/arp_request
    print(arp_request_broadcast.summary())
    arp_request_broadcast.show()

scan('10.0.2.1/24')

任何可以给我脚踏实地的答案的人都会受到赞赏，因为我不是一个狡猾的向导。谢谢

Answer 1

您可以对单个数据包而不是一组数据包使用.show()和.summary()。 10.0.2.1/24是一个包含256个地址的子网，因此当您将其传递到ARP时，它将创建256个ARP数据包。

import scapy.all as scapy

def scan(ip):
    arp_requests = scapy.ARP(pdst=ip)
    for req in arp_requests:
        req.show()
    broadcast = scapy.Ether(dst='ff:ff:ff:ff:ff:ff')
    broadcast.show()
    arp_request_broadcast = broadcast/arp_requests
    arp_request_broadcast.summary() 
    for req in arp_request_broadcast:
        req.show()

scan('10.0.2.1/24')

如果您在此处遍历所有数据包，您的代码将不会出错。

输出看起来像这样（仅显示每个for循环的最后一个数据包）：

...<truncated>
###[ ARP ]###
  hwtype= 0x1
  ptype= IPv4
  hwlen= None
  plen= None
  op= who-has
  hwsrc= 6c:96:cf:d8:7f:e7
  psrc= 192.168.1.246
  hwdst= 00:00:00:00:00:00
  pdst= 10.0.2.255

...<truncated>
###[ Ethernet ]###
  dst= ff:ff:ff:ff:ff:ff
  src= 6c:96:cf:d8:7f:e7
  type= ARP
###[ ARP ]###
     hwtype= 0x1
     ptype= IPv4
     hwlen= None
     plen= None
     op= who-has
     hwsrc= 6c:96:cf:d8:7f:e7
     psrc= 192.168.1.246
     hwdst= 00:00:00:00:00:00
     pdst= 10.0.2.255