Simple script for setting allowed IP address in tinyproxy

I’m using a dynamic IP address, but for Salesforce development I need a fixed one. As a proxy with a fixed IP address is enough, I use tinyproxy for that. Of course I cannot afford to have an unrestricted open proxy. Now this small script helps me achieve this in a half-automated way. I ssh in to my proxy-server, call this script, and it takes care of producing an appropriate line in the configuration:

#! /bin/bash
# Find the ip address of the calling ssh
callerId=`echo $SSH_CONNECTION | awk '{print $1}'`
# Find the allow line and set it to the ip address
sudo sed -i "/# set from script/!b;n;cAllow ${callerId}" /etc/tinyproxy.conf
sudo systemctl restart tinyproxy

In order for this to work, you need a marker in your tinyproxy.conf. This script looks for „# set from script“, and replaces the following line with an Allow-entry.