Challenge ·Easy

Forward a Port Using The Multipurpose Relay Tool: socat

Ivan Velichko
by  Ivan Velichko · on
LinuxNetworking
Prove your networking skills by mapping one network address to another using socat.
#port-forwarding#socat#socket

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There is an HTTP service listening on port 127.0.0.1:5000. Your task is to make this service also available on 0.0.0.0:6000. You're not allowed to change the service configuration or restart it, and you should use socat to map the port.

Port forwarding with a user-space proxy (socat, netcat, etc.)
Hint 1

socat is a universal "relay" tool that can forward data between two arbitrary endpoints (files, pipes, sockets, etc.).

Hint 2

In the socket-forwarding mode, socat acts as a proxy server that accepts connections on one end and forwards data to a predefined destination on the other end.

Hint 3

Knowing the main steps a typical socket server performs to accept and process a connection will help you grasp the socat port forwarding command syntax.

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Install labctl CLI

curl -sf https://labs.iximiuz.com/cli/install.sh | sh

This will download and install the latest version of the labctl CLI. You only need to do this once per workstation.

Authorize labctl

labctl auth login

This will open a browser window asking you to authorize labctl to access your account. You need to do it after a fresh install of labctl and repeat it whenever the auth session expires.

Pull challenge content

labctl content pull challenge port-forwarding-using-socat

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Stream your changes

labctl content push -fw challenge port-forwarding-using-socat

Run this command in a separate terminal to continuously upload your changes to the server while editing the challenge in your favorite text editor or IDE.

You can also use labctl to create, list, and delete your content. Learn more about the available commands: labctl content --help

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