# 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