Inserted the debug funcion.

firewall/firewall-add

@@ -1,16 +1,32 @@
 #!/bin/sh
 
+# Debugging function
+debug() {
+        if [ $DEBUG -eq 1 ]; then
+                echo "DEBUG: "$1 $2 $3
+        fi; 
+}
+
 # Task type variables
 NSENTER=$NSENTER
 PREROUTING=$PREROUTING
 POSTROUTING=$POSTROUTING
 
 # Mandatory task variables
-NAME=$NAME-$COMMENT
 CHAIN=$CHAIN
+NAME=$NAME
 COMMENT=$COMMENT
+NAME=$NAME-$COMMENT
 PROTOCOL=$TYPE
 
+EXTRA_OPTIONS="$2 $3 $4"
+      
+      # turn on debug mode by extra option "debug"
+      if [[ "$(echo "$EXTRA_OPTIONS" | grep debug)" != "" ]] ; then
+              DEBUG=1
+      fi;
+
+
 ##############################
 
 echo 1 > /proc/sys/net/ipv4/ip_forward
@@ -81,6 +97,8 @@ if [[ "$NSENTER" == "true" ]] ; then
 	if [[ "$PREROUTING" == "true" ]] || [[ "$POSTROUTING" == "true" ]] ; then
 		iptables="nsenter -t $(docker inspect --format {{.State.Pid}} $NAME) -n -- $IPTABLES -t nat";
 		
+		debug "iptables: "$IPTABLES;
+		
 		if [[ "$PREROUTING" == "true" ]] ; then
 			prerouting;