portfwd

A simple and efficient TCP/UDP port forwarder

About • Features • Build • Configuration • Run • License

About

portfwd is a simple tool designed to forward TCP or UDP traffic to different ports.

Features

• ✅ A single statically compiled binary for each OS/architecture
• ✅ Support TCP traffic
• ✅ Support UDP traffic
• ✅ Can forward multiple ports to multiple locations simultaneously
• ✅ An easily configurable tool
• ✅ Can operate effortlessly as a daemon

Build

First check that you have Golang installed on your machine.
Then, run:

make 

Quite simply!

Configuration

Here is an example of a configuration (YAML):

forward:
  # Forward TCP traffic from one port to a single other
  - protocol: tcp
    from: 127.0.0.1:5100
    to: [10.2.0.1:5101]
  # Forward of TCP traffic from one port to several others
  - protocol: tcp
    from: 127.0.0.1:5200
    to: [127.0.0.1:5201, 10.2.0.1:5202]
  # Forward UDP traffic from one port to a single other
  - protocol: udp
    from: 127.0.0.1:5300
    to: [10.2.0.1:5301]
  # Forward of UDP traffic from one port to several others
  - protocol: udp
    from: 127.0.0.1:5400
    to: [127.0.0.1:5401, 10.2.0.1:5402]

Run

Direct use

To be able to use portfwd directly, you must set the environment variable PORTFWD_CONFIG_FILE_PATH as the path to the configuration file.
For example :

export PORTFWD_CONFIG_FILE_PATH=./config.yaml

Then you can run the program:

./portfwd

As a systemd service

It is possible to easily use portfwd as a daemon with the provided systemd service.
The systemd service provided can be adapted to your needs.

Steps to install portfwd as a systemd service:

• Create a group:

groupadd portfwd

• Create an user:

useradd -r -s /sbin/nologin -g portfwd portfwd

• Copy the portfwd binary to /usr/bin/

cp portfwd /usr/bin/

• Create a portfwd folder in /etc/ for the configuration file

mkdir /etc/portfwd

• Copy the config.yaml configuration file to /etc/portfwd/

cp config.yaml /etc/portfwd/

• Copy the portfwd.service systemd service file to /etc/systemd/system/

cp portfwd.service /etc/systemd/system/

• Start the systemd service

systemctl start portfwd

License

This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with this program. If not, see http://www.gnu.org/licenses/.