# =============================================================================
# autoIpTables.sh
# 
# Setup multiple IpTables incoming and outgoing port mappings for easy setup.
# 
# Copyright (c) 2025 VELENDEU, eetnaviation
# 
# https://velend.eu/
# https://git.velend.eu/eetnaviation/shscripts
# 
# All rights reserved unless otherwise stated.
# 
# Permission is hereby denied to copy, modify, distribute, sublicense,
# or sell copies of this software without explicit prior written consent.
# 
# All dependency trademarks and names if included are subject to copyright
# of their respective owners.
# 
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.
# =============================================================================

#!/bin/bash

declare -A PORT_MAPS=( # Write your ports in here, example [80]=1234 would direct outside port 80 to inside port 1234
  [80]=1234
)

# Apply iptables rule for each mapping
for outsidePort in "${!PORT_MAPS[@]}"; do
  insidePort="${PORT_MAPS[$outsidePort]}"
  iptables -t nat -A PREROUTING -p tcp --dport "$outsidePort" -j REDIRECT --to-port "$insidePort"
done

# Display all mappings
iptables -t nat -L -v -n