python 索引错误: list index out of range on arp_scan script

Question

我在运行代码时遇到此错误:

  prefix = ip.split('.')[0] + '.' + ip.split('.')[1] + '.' + ip.split('.')[2] + '.'
IndexError: list index out of range

剧本不是我自己写的。我需要在 Intranet 上执行 arp 扫描，并将每个响应的 IP 地址作为输出。我的代码是这样的:

#!/usr/bin/python

import logging
import subprocess
logging.getLogger("scapy.runtime").setLevel(logging.ERROR)
from scapy.all import *

if len(sys.argv) != 2:
    print("Usage - ./arp_disc.py [interface]")
    print("Example - ./arp_disc.py eth0")
    print("Example will perform an ARP scan of the local subnet to which eth0 is assigned")
    sys.exit()

interface = str(sys.argv[1])

ip = subprocess.check_output("ifconfig " + interface + " | grep 'inet addr' | cut -d ':' -f 2 | cut -d ' ' -f 1", shell=True).strip()
prefix = ip.split('.')[0] + '.' + ip.split('.')[1] + '.' + ip.split('.')[2] + '.'

for addr in range(0,254):
    answer=sr1(ARP(pdst=prefix+str(addr)),timeout=1,verbose=0)
    if answer == None:
        pass
    else:
        print prefix+str(addr)

Answer 1

请改用以下内容:

ip = subprocess.check_output("ifconfig " + interface + " | grep 'inet' | cut -d ':' -f 2 | cut -d '' -f 1", shell=True).strip()
ip= ip[5:]