scapy.error.Scapy_Exception:无法附加BPF过滤器

Question

我在youtube上找到了一个用python写的WiFi扫描仪。https://www.youtube.com/watch?v=DFTwB2nAexs直接GitHub脚本链接：arp.py

但是我对BPF过滤器有一个问题："scapy.error.Scapy_Exception:无法附加BPF过滤器！！“

脚本

#!/usr/bin/env python3
# Import scapy
import scapy.all as scapy

# We need to create regular expressions to ensure that the input is correctly formatted.
import re

# Basic user interface header
print(
    r"""______            _     _  ______                 _           _ 
|  _  \          (_)   | | | ___ \               | |         | |
| | | |__ ___   ___  __| | | |_/ / ___  _ __ ___ | |__   __ _| |
| | | / _` \ \ / / |/ _` | | ___ \/ _ \| '_ ` _ \| '_ \ / _` | |
| |/ / (_| |\ V /| | (_| | | |_/ / (_) | | | | | | |_) | (_| | |
|___/ \__,_| \_/ |_|\__,_| \____/ \___/|_| |_| |_|_.__/ \__,_|_|"""
)
print("\n****************************************************************")
print("\n* Copyright of David Bombal, 2021                              *")
print("\n* https://www.davidbombal.com                                  *")
print("\n* https://www.youtube.com/davidbombal                          *")
print("\n****************************************************************")

# Regular Expression Pattern to recognise IPv4 addresses.
ip_add_range_pattern = re.compile("^(?:[0-9]{1,3}\.){3}[0-9]{1,3}/[0-9]*$")

# Get the address range to ARP
while True:
    ip_add_range_entered = input(
        "\nPlease enter the ip address and range that you want to send the ARP request to (ex 192.168.1.0/24): "
    )
    if ip_add_range_pattern.search(ip_add_range_entered):
        print(f"{ip_add_range_entered} is a valid ip address range")
        break


# Try ARPing the ip address range supplied by the user.
# The arping() method in scapy creates a pakcet with an ARP message
# and sends it to the broadcast mac address ff:ff:ff:ff:ff:ff.
# If a valid ip address range was supplied the program will return
# the list of all results.
arp_result = scapy.arping(ip_add_range_entered)

输出

Please enter the ip address and range that you want to send the ARP request to (ex 192.168.1.0/24): 192.168.1.0/24
192.168.1.0/24 is a valid ip address range
Traceback (most recent call last):
  File "/Users/belgra/Development/WiFi Scanner/lan_scan_arp.py", line 41, in <module>
    arp_result = scapy.arping(ip_add_range_entered)
  File "/opt/homebrew/lib/python3.10/site-packages/scapy/layers/l2.py", line 734, in arping
    ans, unans = srp(
  File "/opt/homebrew/lib/python3.10/site-packages/scapy/sendrecv.py", line 675, in srp
    s = iface.l2socket()(promisc=promisc, iface=iface,
  File "/opt/homebrew/lib/python3.10/site-packages/scapy/arch/bpf/supersocket.py", line 254, in __init__
    super(L2bpfListenSocket, self).__init__(*args, **kwargs)
  File "/opt/homebrew/lib/python3.10/site-packages/scapy/arch/bpf/supersocket.py", line 119, in __init__
    attach_filter(self.ins, filter, self.iface)
  File "/opt/homebrew/lib/python3.10/site-packages/scapy/arch/bpf/core.py", line 155, in attach_filter
    raise Scapy_Exception("Can't attach the BPF filter !")
scapy.error.Scapy_Exception: Can't attach the BPF filter !
/Users/belgra/Development/WiFi Scanner ❯                                  

我安装了替罪羊2.4.5，并通过Python3.10.1在M1 Mac上运行这段代码。

有什么想法吗？

Answer 1

我能够通过安装Scapy在安装文档中提到的可选libpcap库来解决这个问题。

1. 在终端中运行brew update
2. 在终端中运行brew install libpcap
3. 在您的终端中使用scapy运行Scapy
4. 在Scapy中运行conf.use_pcap = True

下面是包含更多信息的文档的链接

作为参考，我正在使用python3.8.12运行M1 MacBook Air (macOS蒙特雷v12.1)。

Answer 2

我在一个M1 MacBook上得到了同样的错误，我按照@RBPEDIIIAL的建议，通过安装和配置libpcap来解决这个问题。