[英]suppress scapy warning message when importing the module
I'm writing a small script, that gathers some information using scapy and then returns some xml code, that I'll pass on to the xmlrpc interface of metasploit. 我正在编写一个小脚本,使用scapy收集一些信息,然后返回一些xml代码,我将传递给metasploit的xmlrpc接口。 I'd like it that my script only returns xml, and no additional warnings etc. 我希望我的脚本只返回xml,没有其他警告等。
I can suppress most scapy output, with adding the option verbose=0
to my sr1 command. 我可以通过向我的sr1命令添加选项verbose=0
来抑制大多数scapy输出。 What I still get before every output, and I assume it returns this warning when I'm loading the module, is: 我在每个输出之前仍然得到的,并且我假设它在我加载模块时返回此警告,是:
WARNING: No route found for IPv6 destination :: (no default route?) 警告:找不到IPv6目标的路由::(没有默认路由?)
I can easily redirect that output, by calling my script like this: 通过调用我的脚本,我可以轻松地重定向该输出:
./myscript 2> /dev/null
but I'd like to incorporate this into the script. 但我想将其纳入脚本中。 For that I've found a hint, that one could have a NullDevice class, that doesn't write anything, and then set sys.stderr
to an instantiation of that NullDevice class. 为此,我找到了一个提示,一个可以有一个NullDevice类,它不会写任何东西,然后将sys.stderr
设置为该NullDevice类的实例化。
This only works unfortunately after I've already loaded the module, so I still have the Warning, and it only redirects any following messages sent to stderr. 这只在我已经加载模块后不幸地工作,所以我仍然有警告,它只重定向发送到stderr的任何后续消息。
How can I suppress that warning message to appear on my screen? 如何禁止显示在屏幕上的警告消息?
You can get rid of warnings by scapy by adding: 您可以通过添加以下内容来消除scapy的警告:
logging.getLogger("scapy.runtime").setLevel(logging.ERROR)
before importing Scapy. 在导入Scapy 之前 。 This will suppress all messages that have a lower level of seriousness than error messages. 这将禁止所有具有较低严重性的消息而不是错误消息。
for example: 例如:
import logging
logging.getLogger("scapy.runtime").setLevel(logging.ERROR)
from scapy.all import *
...
I think this is the correct way. 我认为这是正确的方法。
>>> import sys
>>> sys.stderr = None # suppress stderr
>>> from scapy.all import *
>>> sys.stderr = sys.__stderr__ # restore stderr
>>> print("other errors can be shown", file=sys.stderr)
other errors can be shown
>>>
I think perhaps the python3 version of scapy prints a message from a different logger or at a high level. 我想scapy的python3版本可能会打印来自不同记录器或高级别的消息。 Here's some code I've used to suppress output on module import. 这是我用来抑制模块导入输出的一些代码。
from contextlib import contextmanager
# It looks like redirect_stderr will be part of Python 3.5 as follows:
# from contextlib import redirect_stderr
# Perhaps if you're looking at this code and 3.5 is out, this function could be
# removed.
@contextmanager
def redirect_stderr(new_target):
"""
A context manager to temporarily redirect stderr. Example use:
with open(os.devnull, 'w') as f:
with redirect_stderr(f):
# stderr redirected to os.devnull. No annoying import messages
# printed on module import
from scapy.all import *
# stderr restored
"""
import sys
old_target, sys.stderr = sys.stderr, new_target # replace sys.stdout
try:
yield new_target # run some code with the replaced stdout
finally:
sys.stderr = old_target # restore to the previous value
# Don't print the annoying warning message that occurs on import
with open(os.devnull, 'w') as errf:
with redirect_stderr(errf):
from scapy.all import sr, ICMP, IP, traceroute
With Python3, redefining sys.stderr to None threw an exception AttributeError: 'NoneType' object has no attribute 'write' . 使用Python3, 将sys.stder重新定义为None会引发异常AttributeError:'NoneType'对象没有属性'write' 。 Instead, defining it to os.devnull
does the job: 相反,将它定义为os.devnull
完成这项工作:
import os
import sys
sys.stderr = os.devnull # suppress stderr
from scapy.all import *
sys.stderr = sys.__stderr__ # restore stderr
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