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# Licensed to the Apache Software Foundation (ASF) under one
# or more contributor license agreements. See the NOTICE file
# distributed with this work for additional information
# regarding copyright ownership. The ASF licenses this file
# to you 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.
# Redirect TCP/IP traffic to a particular IP address from one port to another
# port. This is useful to handle incoming traffic on a standard reserved port
# like 80 or 443 for example in an unprivileged user process bound to a non
# reserved port.
# Example: ip-redirect 80 8090 10.1.1.1
sport=$1
tport=$2
dest=$3
# Redirect external incoming traffic
sudo /sbin/iptables -t nat -S PREROUTING | grep "\-d $dest/" | grep "\-p tcp" | grep "\-\-dport $sport" | grep "\-j REDIRECT" | sed "s/^-A/-D/" | awk -F "\t" '{ printf "sudo /sbin/iptables -t nat %s\n", $1 }' | /bin/sh
sudo /sbin/iptables -t nat -A PREROUTING --destination $dest -p tcp --dport $sport -j REDIRECT --to-ports $tport
# Redirect local traffic as well
sudo /sbin/iptables -t nat -S OUTPUT | grep "\-d $dest/" | grep "\-p tcp" | grep "\-\-dport $sport" | grep "\-j REDIRECT" | sed "s/^-A/-D/" | awk -F "\t" '{ printf "sudo /sbin/iptables -t nat %s\n", $1 }' | /bin/sh
sudo /sbin/iptables -t nat -A OUTPUT --destination $dest -p tcp --dport $sport -j REDIRECT --to-ports $tport
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