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#!/bin/bash
#############################################################################
#Copyright 2017 Parker Berberian and others #
# #
#Licensed under the Apache License, Version 2.0 (the "License"); #
#you may not use this file except in compliance with the License. #
#You may obtain a copy of the License at #
# #
# http://www.apache.org/licenses/LICENSE-2.0 #
# #
#Unless required by applicable law or agreed to in writing, software #
#distributed under the License is distributed on an "AS IS" BASIS, #
#WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. #
#See the License for the specific language governing permissions and #
#limitations under the License. #
#############################################################################
MYIP=$1
DESTINATION=$2
MYBRIDGE=10.20.1.1
DESTNETWORK=10.20.1.0/24
PORT=80
iptables -I INPUT 2 -d "$MYIP" -p tcp --dport "$PORT" -j ACCEPT
iptables -t nat -I INPUT 1 -d "$MYIP" -p tcp --dport "$PORT" -j ACCEPT
iptables -I FORWARD -p tcp --dport "$PORT" -j ACCEPT
iptables -t nat -I PREROUTING -p tcp -d "$MYIP" --dport "$PORT" -j DNAT --to-destination "$DESTINATION:$PORT"
iptables -t nat -I POSTROUTING -p tcp -s "$DESTINATION" ! -d "$DESTNETWORK" -j SNAT --to-source "$MYIP"
iptables -t nat -I POSTROUTING 2 -d "$DESTINATION" -j SNAT --to-source "$MYBRIDGE"
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