SSH Tunnel with auto reconnect

ssh_tunnel.sh

#!/bin/sh

# endless ssh tunnel. Makes sure to reconnect if the connection breaks (eg "broken pipe")
# why? if you want to expose your localhost to the public without dealing with firewalls / routers - works similar to ngrok and is free
#
# what do I need?
# you will need an external server with ssh access.
#
# how?
# you will need to create a ssh key for your external server so you don't need a password. (important for reconnecting)
# Edit the ports and ssh command, make this script executable and execute it
# This script simply runs ssh command in an endless loop. So if the connection breaks, it will reconnect asap.
# To stop the tunnel press CTRL+C


remote_port=8080
local_port=80
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echo "***************************************"
echo "*** SSH TUNNEL"
echo "*** LOCAL PORT = $local_port       REMOTE PORT = $remote_port"
echo "***************************************"

while :
do
   CURRENT_TIME=$(date +"%Y-%m-%d %H:%M:%S")
   echo "$CURRENT_TIME connecting"
   ssh -nN -R ${remote_port}:localhost:${local_port} $ssh 2> /dev/null
done