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wifi-updown v0.5 [07 Jun 2020] by Dominic

Description

Brings up or takes down a wifi network interface depending on whether there is a live wired network interface. For use under GNU/Linux. Intended to be run at boot time (e.g. from /etc/rc.local) as a way to reduce the attack
surface for a machine which has both wired and wifi interfaces connecting to the same network.

wifi-updown.sh can be run by a non-root user to show the situation, but not to make changes.

Note

Taking down the wifi interface with wifi-updown.sh may leave the machine with no default route, so that DNS lookups fail - to check/fix this, run https://www.timedicer.co.uk/programs/help/routefix.sh.php after
wifi-updown.sh.

Options

-h show this help and exit
-l show changelog and exit
-q be quieter (i.e. no header)

Dependencies

ip logger

License

Copyright © 2020 Dominic Raferd. Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at
https://www.apache.org/licenses/LICENSE-2.0. Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
either express or implied. See the License for the specific language governing permissions and limitations under the License.

Changelog

0.5 [07 Jun 2020] - recognise any device with name beginning with 'w' as wifi
0.4 [30 Jan 2020] - add use of rfkill (as well as ip link set up/down)
0.3 [19 Dec 2019] - remove dependency on ifup/ifdown
0.2 [09 Nov 2018] - first public release
0.1 [05 Nov 2018] - first version with help/changelog

Download wifi-updown.sh

Donation

I have provided this software free gratis and for nothing. If you would like to thank me with a contribution, please let me know and I will send you a link. Thank you!

My Other Sites

My Programs

Here is a selection of some (other) programs I have written, most of which run from the command line (CLI), are freely available and can be obtained by clicking on the links. Dependencies are shown and while in most cases written for a conventional Linux server, they should run on a Raspberry Pi, and many can run under Windows using Windows Subsystem for Linux (WSL) or Cygwin. Email me if you have problems or questions, or if you think I could help with a programming requirement.

Backup Utilities

Debian/Ubuntu kernel and LVM Utilities

Dellmont - VoIP and Mobile Phone Account Utilities

Miscellaneous Programs

Comments

If you have a comment or question, please email me, thank you.

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