script to start a ssh reverse tunnel using autossh on ubuntu

ssh-reverse-tunnel

#! /bin/sh
#
# Author:       Edison <hydra1983@gmail.com>
#
# This is a modified version for from Andreas Olsson <andreas@arrakis.se>
# For each tunnel; make a uniquely named copy of this template.

## SETTINGS
#
# remote ssh user
RUSER="sshtunnel"
# remote ssh server
RSERVER=... remote server ip ...
# remote ssh port
RPORT="22"
# remote listening port
RLPORT="10022"
# autossh monitoring port (unique)
MPORT=20000
# the ssh tunnel to setup
TUNNEL="-R ${RSERVER}:${RLPORT}:localhost:${RPORT}"
# You must use the real autossh binary, not a wrapper.
DAEMON=/usr/lib/autossh/autossh
#identity file
IDENTITY_FILE=/etc/autossh/sshtunnel_id_rsa
#
## END SETTINGS

PATH=/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin

NAME=`basename $0`
PIDFILE=/var/run/${NAME}.pid
SCRIPTNAME=/etc/init.d/${NAME}
DESC="SSH reverse tunnel"

test -x $DAEMON || exit 0

export AUTOSSH_PORT=${MPORT}
export AUTOSSH_PIDFILE=${PIDFILE}
export AUTOSSH_LOGFILE=/var/log/autossh.log
export AUTOSSH_LOGLEVEL=3
ASOPT=${TUNNEL}" -f -N -i "${IDENTITY_FILE}" -p "${RPORT}" "${RUSER}"@"${RSERVER}

#       Function that starts the daemon/service.
d_start() {
        start-stop-daemon --start --quiet --pidfile $PIDFILE \
                --exec $DAEMON -- $ASOPT
        if [ $? -gt 0 ]; then
            echo -n " not started (or already running)"
        else
            sleep 1
            start-stop-daemon --stop --quiet --pidfile $PIDFILE \
                --test --exec $DAEMON > /dev/null || echo -n " not started"
        fi

}

#       Function that stops the daemon/service.
d_stop() {
        start-stop-daemon --stop --quiet --pidfile $PIDFILE \
                --exec $DAEMON \
                || echo -n " not running"
}


case "$1" in
  start)
        echo -n "Starting $DESC: $NAME"
        d_start
        echo "."
        ;;
  stop)
        echo -n "Stopping $DESC: $NAME"
        d_stop
        echo "."
        ;;

  restart)
        echo -n "Restarting $DESC: $NAME"
        d_stop
        sleep 1
        d_start
        echo "."
        ;;
  *)
        echo "Usage: $SCRIPTNAME {start|stop|restart}" >&2
        exit 3
        ;;
esac

exit 0