nagios-plugins/check_reversetunnel

#!/bin/sh
#
NAGIOS_OK=0
NAGIOS_ERROR=2
#
MULTIMEDIA_TUNNEL_REGEX="\-R 10022:localhost:22.*mount-mockery.de$"
#
AUTOSSH_PIDs=$(pidof autossh)
if [ -z $AUTOSSH_PIDs ]; then
    # no autossh process running
    echo "ERROR - No autossh process is running!"
    exit $NAGIOS_ERROR
else
    # there is an autossh process
    ps x -q $AUTOSSH_PIDs | grep "$MULTIMEDIA_TUNNEL_REGEX" 2>&1 > /dev/null
    if [ $? -eq 0 ]; then
        echo "OK - The required autossh process is running"
        exit $NAGIOS_OK
    else
        echo "ERROR - There are autossh processes, but none of them fit to the required connection details"
        exit $NAGIOS_ERROR
    fi
fi