check_reversetunnel rework

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