The purpose of this tool is to be able to, through NetworkManager, completely shutdown all network devices — and bring them back up when needed. I use ArchLinux with the i3 window manager, so the program is somewhat tied to them (particularly concerning
systemd, and the shell,
bash in my case).
(If you are wondering why would I want to toggle between on and offline like this, instead of being always online, it is because the internet is transformed into a gigantic weapon of mass distraction, being on the cross-hairs of which I usually prefer to avoid.)
How it works
The source consists of a a C source file, which produces an executable named
nm-toggle. It takes two arguments
on|off, the latter being the default (for when either no argument is provided, or an invalid argument is provided). For
off, it disables wired and wireless interfaces, stops
NetworkManager, and then masks its service files. This is to prevent it going up in the next reboot. For
on, it does the opposite: unmask, start
NetworkManager, and enable wired and wireless interfaces.
The executable should be stored in
/usr/local/bin, which is virtually always a) on
$PATH (put it there if it’s not); and b) only writable by
root. It only takes two short arguments – so I allow it to run with password-less
sudo privileges. If a remote attacker gains non-root access to my machine, this program only buys him the possibility of closing the network, which doesn’t really help his case… (if he gains root access, I am toast anyway,
sudo privileges or not).
For convenience, two
.bashrc alias are provided (see below), and a
systemd service file to ensure
NetworkManager will not be automagically brought up in the next reboot.
sudoif you don’t have it already.
$ sudo cp nm-toggle /usr/local/bin
visudoand write this line:
If your default editor is
vi(m), save and exit by hitting
<Esc>:wq<Enter>. Now the command can be run without requiring a password.
- The following aliases might come useful (
Remember to source
.bashrc before using it.
- To avoid
NetworkManagerautomagically starting up on the next reboot, put the
/usr/lib/systemd/system, and then do:
You can additionally also do
start (after doing
enable) to test the service —
NetworkManager should be totally brought down.
Now at a terminal, just type
offline to kill all connectivity.
$ online brings everything back up. Note that it may take a few seconds for a wireless link to be (re-)established (ethernet is usually near-instantaneous).
And that’s it. Enjoy the minimisation of your online time!