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A very simple SOCKS4 server :)

• Set up the listening socket and dump the bytes received from the SOCKS client when it connects
• Establish the connection to the target
• Once the connection is established to the target, how do you know when data is available to send back to the client?
• Likewise, how do you know when the client wants to send data (hint: non-blocking sockets)
• How do you ensure the entire proxy is non-blocking (you're not waiting for the client to send something before receiving from the server)?
• Can you add support for multiple clients?

• Tests

Making a client request

curl -v --socks4 socks4://127.0.0.1:8080 https://www.google.com