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#!/usr/bin/env python3
DESCRIPTION = """
This script runs a command with a different network configuration using firejail.
THIS MIGHT BE UNSAFE. USE AT YOUR OWN CAUTION:
* Input might not be correctly validated.
* Use of firejail might not be correct.
"""
import argparse
import pathlib
import shlex
import subprocess
import tempfile
import textwrap
def main():
parser = argparse.ArgumentParser(description=DESCRIPTION)
parser.add_argument("network_interface")
parser.add_argument("dns")
parser.add_argument("gateway")
parser.add_argument("ip")
parser.add_argument("command", nargs="+")
parser.add_argument("--route", action="append", help="destination,gateway")
args = parser.parse_args()
routes = "\n".join([_make_route(r) for r in args.route])
command = shlex.join(args.command)
with tempfile.TemporaryDirectory() as tempdir:
script = pathlib.Path(tempdir) / "script"
script.write_text(textwrap.dedent(
f"""
#!/bin/sh
{routes}
{command}
"""
).lstrip())
script.chmod(0o555)
command = ["sudo", "firejail", f"--net={args.network_interface}", f"--dns={args.dns}", f"--defaultgw={args.gateway}", f"--ip={args.ip}", f"--whitelist={script}", "--", script]
subprocess.run(command, check=True)
def _make_route(argument):
destination, gateway = argument.split(",")
return shlex.join(["ip", "route", "add", destination, "via", gateway, "dev", "eth0"])
if __name__ == "__main__":
main()
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