A small SSH tunnel helper script

tunhelper.sh

#!/bin/bash

##################################
# Small SSH tunnel helper script
# polprog 2017
# http://polprog.net
##################################


SOCKET="vnctun"
USER="$2"
REMOTE="$3"
PORTCONF="$4"

if [ $# -lt 3 ]
then
    echo "Usage: $0 start <remote user> <remote addr> <portconfig>"
    echo "Or:    $0 <stop|check> <remote user> <remote addr>"
    echo "Where portconfig is <local port>:<local ip>:<remote port>"
    echo "For example to tunnel remote's port 80 to local port 8080"
    echo "Use 8080:127.0.0.1:80"
    exit 1
    
fi


case "$1" in
    start)
	if [ $# -lt 4 ]
	then
	    echo "Missing portconfig! see usage!"
	    exit 2
	fi
	ssh -M -S $SOCKET -L $PORTCONF -f -N -l $USER $REMOTE 
	;;

    stop|check)
	ssh -S $SOCKET -O $1 $USER $REMOTE
	;;

esac
exit 0