如何解决Argparse '参数 1 必须是 str、bytes 或 bytearray,而不是 None'
import logging
logging.getLogger("scapy.runtime").setLevel(logging.ERROR)
import sys
from scapy.all import *
import argparse
parser = argparse.ArgumentParser(add_help=False)
parser.add_argument("--remote_host")
parser.add_argument("--verbose")
parser.add_argument("--help",action='store_true')
args = parser.parse_args()
if args.help:
print("HELP...")
# Define end host and TCP port range
hostInput = args.remote_host
host = socket.gethostbyname(hostInput)
port_range = [21,22,23,25,53,80,110,135,137,138,139,443,1433,1434,8080]
# Send SYN with random Src Port for each Dst port
for dst_port in port_range:
src_port = random.randint(1025,65534)
resp = sr1(
IP(dst=host)/TCP(sport=src_port,dport=dst_port,flags="S"),timeout=1,verbose=int(args.verbose),)
if resp is None:
print(f"{host}:{dst_port} is filtered (silently dropped).")
elif(resp.haslayer(TCP)):
if(resp.getlayer(TCP).flags == 0x12):
# Send a gratuitous RST to close the connection
send_rst = sr(
IP(dst=host)/TCP(sport=src_port,flags='R'),)
print(f"{host}:{dst_port} is open.")
elif (resp.getlayer(TCP).flags == 0x14):
print(f"{host}:{dst_port} is closed.")
elif(resp.haslayer(ICMP)):
if(
int(resp.getlayer(ICMP).type) == 3 and
int(resp.getlayer(ICMP).code) in [1,2,3,9,10,13]
):
print(f"{host}:{dst_port} is filtered (silently dropped).")
使用 --remote_host 127.0.0.1 --verbose 1
运行正常,没有错误
使用 --help
运行会产生:
TypeError: gethostbyname() argument 1 must be str,bytes or bytearray,not None
注意:上述错误当然只有在我包含 print("Help...")
这里是完整的回溯:
Python 3.8.0 (tags/v3.8.0:fa919fd,Oct 14 2019,19:37:50) [MSC v.1916 64 bit (AMD64)] on win32
Type "help","copyright","credits" or "license()" for more information.
>>>
= RESTART: C:\Users\00082563\AppData\Local\Programs\Python\AT2_PythonNetworkApplications.v1.1a\Scenario 1\logger.py
HELP...
Traceback (most recent call last):
File "C:\Users\00082563\AppData\Local\Programs\Python\AT2_PythonNetworkApplications.v1.1a\Scenario 1\logger.py",line 48,in <module>
host = socket.gethostbyname(hostInput)
TypeError: gethostbyname() argument 1 must be str,not None
>>>
解决方法
正如上面评论中所建议的,我需要在以下时间退出程序:
if args.help:
print("HELP...")
因此在下面的脚本中,用户可以添加 CLI --remote_host google.com --verbose 0
(或详细信息 1 以获取完整详细信息...)
用户可以改为在 CLI 中使用 --help
打印自定义帮助部分,之后程序将退出。
#!/usr/bin/env python
import logging
logging.getLogger("scapy.runtime").setLevel(logging.ERROR)
import sys
from scapy.all import *
import argparse
parser = argparse.ArgumentParser(add_help=False)
parser.add_argument("--remote_host")
parser.add_argument("--verbose")
parser.add_argument("--help",action='store_true')
args = parser.parse_args()
if args.help:
print("Help section...")
exit()
# Define end host and TCP port range
hostInput = args.remote_host
host = socket.gethostbyname(hostInput)
port_range = [21,22,23,25,53,80,110,135,137,138,139,443,1433,1434,8080]
# Send SYN with random Src Port for each Dst port
for dst_port in port_range:
src_port = random.randint(1025,65534)
resp = sr1(
IP(dst=host)/TCP(sport=src_port,dport=dst_port,flags="S"),timeout=1,verbose=int(args.verbose),)
if resp is None:
print(f"{host}:{dst_port} is filtered (silently dropped).")
elif(resp.haslayer(TCP)):
if(resp.getlayer(TCP).flags == 0x12):
# Send a gratuitous RST to close the connection
send_rst = sr(
IP(dst=host)/TCP(sport=src_port,flags='R'),)
print(f"{host}:{dst_port} is open.")
elif (resp.getlayer(TCP).flags == 0x14):
print(f"{host}:{dst_port} is closed.")
elif(resp.haslayer(ICMP)):
if(
int(resp.getlayer(ICMP).type) == 3 and
int(resp.getlayer(ICMP).code) in [1,2,3,9,10,13]
):
print(f"{host}:{dst_port} is filtered (silently dropped).")
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