I'm currently studying penetration testing and Python programming. I just want to know how I would go about executing a Linux command in Python. The commands I want to execute are:
echo 1 > /proc/sys/net/ipv4/ip_forward
iptables -t nat -A PREROUTING -p tcp --destination-port 80 -j REDIRECT --to-port 8080
If I just use print in Python and run it in the terminal will it do the same as executing it as if you was typing it yourself and pressing Enter?
You can use os.system(), like this:
import os
os.system('ls')
Or in your case:
os.system('echo 1 > /proc/sys/net/ipv4/ip_forward')
os.system('iptables -t nat -A PREROUTING -p tcp --destination-port 80 -j REDIRECT --to-port 8080')
Better yet, you can use subprocess's call, it is safer, more powerful and likely faster:
from subprocess import call
call('echo "I like potatos"', shell=True)
Or, without invoking shell:
call(['echo', 'I like potatos'])
If you want to capture the output, one way of doing it is like this:
import subprocess
cmd = ['echo', 'I like potatos']
proc = subprocess.Popen(cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
o, e = proc.communicate()
print('Output: ' + o.decode('ascii'))
print('Error: ' + e.decode('ascii'))
print('code: ' + str(proc.returncode))
I highly recommend setting a timeout in communicate, and also to capture the exceptions you can get when calling it. This is a very error-prone code, so you should expect errors to happen and handle them accordingly.
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