Python: get default gateway for a local interface/ip address in linux

Question

On Linux, how can I find the default gateway for a local ip address/interface using python?

I saw the question \"How to get internal IP, external IP and default gate

Answer 1

here my solution to get default gateway for Mac and Linux with python:

import subprocess
import re
import platform

def get_default_gateway_and_interface():
    if platform.system() == "Darwin":
        route_default_result = subprocess.check_output(["route", "get", "default"])
        gateway = re.search(r"\d{1,3}.\d{1,3}.\d{1,3}.\d{1,3}", route_default_result).group(0)
        default_interface = re.search(r"(?:interface:.)(.*)", route_default_result).group(1)

    elif platform.system() == "Linux":
        route_default_result = re.findall(r"([\w.][\w.]*'?\w?)", subprocess.check_output(["ip", "route"]))
        gateway = route_default_result[2]
        default_interface = route_default_result[4]

    if route_default_result:
        return(gateway, default_interface)
    else:
        print("(x) Could not read default routes.")

gateway, default_interface = get_default_gateway_and_interface()
print(gateway)