#!/bin/sh

CHAIN=$CHAIN
COMMENT=$COMMENT
PROTOCOL=$TYPE

##############################

echo 1 > /proc/sys/net/ipv4/ip_forward

##############################

# 
if /sbin/iptables-legacy --list $CHAIN |grep ESTABLISHED |grep RELATED|grep ACCEPT ;
        then : ;
	        else /sbin/iptables-legacy -I $CHAIN -m state --state established,related -j ACCEPT;
fi

###############################

COUNT_SOURCE_IP=$(set |grep SOURCE_IP |wc -l)
COUNT_TARGET_IP=$(set |grep TARGET_IP |wc -l)
COUNT_TARGET_PORT=$(set |grep TARGET_PORT |wc -l)


for source_ip_index in $(seq 1 $COUNT_SOURCE_IP) ; do
	if set |grep SOURCE_IP_ ; then
		SOURCE_IP=$(eval "echo \${"SOURCE_IP_$source_ip_index"}")
	fi

	for target_ip_index in $(seq 1 $COUNT_TARGET_IP) ; do
		if set |grep TARGET_IP_ ; then
			TARGET_IP=$(eval "echo \${"TARGET_IP_$target_ip_index"}")                 
		fi                                                                               

		for target_port_index in $(seq 1 $COUNT_TARGET_PORT) ; do
			if set |grep TARGET_PORT_ ; then
				TARGET_PORT=$(eval "echo \${"TARGET_PORT_$target_port_index"}")
			fi

			# DELETE UNECESSARY LINES FROM PREVIOUS RULES
			LINES=$(/sbin/iptables-legacy --line-number -n --list $CHAIN | grep $SOURCE_IP |grep $TARGET_IP |grep $PROTOCOL |grep $TARGET_PORT | awk '{print $1}'| tac)

			if [ -n "$LINES" ] ; then
				for i in $LINES; do 
					/sbin/iptables-legacy -D $CHAIN $i
					sleep 0.1
				done
			fi

			/sbin/iptables-legacy -I $CHAIN -s $SOURCE_IP -d $TARGET_IP -p $PROTOCOL --dport $TARGET_PORT -m comment --comment "$COMMENT" -j ACCEPT      
		done
	done
done