Bash_Scripts/CentOS/Port-Forward.bash
2021-11-05 01:32:36 -05:00

79 lines
1.7 KiB
Bash
Executable File

#!/bin/bash --posix
set -e
IP=""
INBOUND_PORT=""
FORWARD_PORT=""
usage() {
printf "%s" "Usage:
--ip
The ip address to forward data to
Example:
--ip 192.168.10.11
--inbound-port
The port that data will be received on
Example:
--inbound-port 22
--forward-port
The port that data will be forwarded to
Example:
--forward-port 2020
All above flags must be passed with arguments"
}
error() {
printf '%s\n' "$1" >&2
exit 1
}
while :; do
case $1 in
-h | -\? | --help)
usage # Display a usage synopsis.
exit
;;
--) # End of all options.
shift
break
;;
--ip)
shift
[[ "${1}" == "" ]] && error "--ip requires an argument"
IP=${1}
;;
--inbound-port)
shift
[[ "${1}" == "" ]] && error "--inbound-port requires an argument"
INBOUND_PORT=${1}
;;
--forward-port)
shift
[[ "${1}" == "" ]] && error "--forward-port requires an argument"
FORWARD_PORT=${1}
;;
-?*)
printf 'Unknown option: %s\n' "$1" >&2
usage
;;
*) # Default case: No more options, so break out of the loop.
break ;;
esac
shift
done
[[ "${IP}" == "" ]] && error "--ip requires an argument"
[[ "${FORWARD_PORT}" == "" ]] && error "--forward-port requires an argument"
[[ "${INBOUND_PORT}" == "" ]] && error "--inbound-port requires an argument"
firewall-cmd --permanent --add-forward-port=port="${INBOUND_PORT}":proto=tcp:toaddr="${IP}":toport="${FORWARD_PORT}"
firewall-cmd --permanent --add-port="${INBOUND_PORT}"/tcp
firewall-cmd --add-masquerade --permanent
firewall-cmd --reload
echo "Routing all data on ${INBOUND_PORT} to ${IP}:${FORWARD_PORT}"