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🔷 (File Transferring Utility) Transfer files through the Net 🔷
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ftu/README.md

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FTU (FileTransferringUtility)

Send files through the Net !

What is that ?

This application is like an FTP server, but overcomplicated, probably overengineered monstrosity. (basically, a file server, but P2P and only one file is shared).

Why ?

Learning

How does this work ?

In order to transfer one file on one computer to another - they need to establish a connection.

In order to establish a connection - there needs to be a 1) server (the owner of the file), waiting for connections, and a 2) client, who will try to connect to a server. If the requirements are met - a client will connect to a server and the packet exchange will begin.

The server and the client needs to communicate with packets according to certain rules, given by a protocol.

In my implementation there is only one basic packet template with fixed fields. The packets are divided into several groups by its headers, this way my basic packet`s template can be used in many ways, without need of creating a brand-new packet with a different kind of a template.

Thus, with a connection and a way of communication, the server will send a fileinfo packet to a client that describes a filename and its size. The client will have the choice of accepting or rejecting the packet. If rejected - the connection will be closed and the program will exit. If accepted - the file will be transferred via packets.

Known issues|problems|lack of features|reasons why it`s bad

  1. VERY slow
  2. VERY expensive on resources
  3. If MAXFILEDATASIZE is bigger than appr. 1024 - the packets on the other end will not be unmarshalled due to error ??
  4. Lack of proper error-handling
  5. Lack of information about the process of transferring (ETA, lost packets, etc.)
  6. No way to verify if the transferred file is not corrupted
  7. No encryption

Good points

  1. It... works ?

IMPORTANT NOTE

This is NOT intended to be a serious application. I'm learning and this is a product of my curiosity. If you're a beginner too, please don't try to find something useful in my code, I am not an expert.

Also, this utility only works if both the server and the client have a port-forwarding enabled and configured. Fortunatelly, locally it works without any port-forwarding.

Inspired by croc

License

MIT