Error bufsize must be an interger

[Peter Queen]

Hello,

After the lesson MAC changer I was practicing and I try to code the setting of wireless adapter in monitor mode. If I run it I get the error bufsize must be an integer.

Can you help?
Thanks

#!/usr/bin/env python

import subprocess
import optparse

def get_arguments():
    parser = optparse.OptionParser()
    parser.add_option("-i", "--interface", dest="interface", help="Interface to change to monitor mode")
    (options, arguments) = parser.parse_args()
    if not options.interface:
        parser.error("[-] Please specify an interface, use --help for info")
    return options

def monitor_mode(interface):
    print("Setting {} to monitor mode".format(interface))
    subprocess.call("ifconfig", interface, "down")
    subprocess.call("iwconfig", interface, "mode", "monitor")
    subprocess.call("ifconfig", interface, "up")

options = get_arguments()
monitor_mode(options.interface)

[diego]

Hi Simo!
Can you share a screenshot of the error so I can see the full traceback?

Let me know.
Diego

[Peter Queen]

.

[Peter Queen]

file:///root/Pictures/Screenshot%20from%202020-06-11%2006-18-59.png

[Peter Queen]

[email protected]:~/PycharmProjects/mac_changer# ls
mac_changer.py set_monitor_mode.py venv
[email protected]:~/PycharmProjects/mac_changer# python set_monitor_mode.py
Usage: set_monitor_mode.py [options]

set_monitor_mode.py: error: [-] Please specify an interface, use –help for info
[email protected]:~/PycharmProjects/mac_changer# python set_monitor_mode.py -i wlan0
Setting wlan0 to monitor mode
Traceback (most recent call last):
File “set_monitor_mode.py”, line 20, in <module>
monitor_mode(options.interface)
File “set_monitor_mode.py”, line 14, in monitor_mode
subprocess.call(“ifconfig”, interface, “down”)
File “/usr/lib/python2.7/subprocess.py”, line 172, in call
return Popen(*popenargs, **kwargs).wait()
File “/usr/lib/python2.7/subprocess.py”, line 343, in __init__
raise TypeError(“bufsize must be an integer”)
TypeError: bufsize must be an integer

[diego]

Hi Simo!

If you want to use that synthax with subprocess you have to use square brackets as well. Like:
subprocess.call([“ifconfig”, interface, “down”])

Let me know how it goes!
Diego

[Peter Queen]

Thanks Diego,

It works perfectly!

[diego]

Hi Simo!

Cool you got it!
Diego

[Author]

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