ftu (FileTransferringUtility)

Send files through the Net !

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● What is that ?

A P2P file sharing program, but overcomplicated and probably an overengineered one.

● 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) sender (server) (the owner of the file), waiting for connections, and a 2) receiver (client), who will try to connect to a sender (server). If the requirements are met - client will connect to 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.

The packet has its header and body. They are divided into several groups of use by headers, this way we can specify what kind of data is stored inside packet`s body and react accordingly.

Thus, with a connection and a way of communication, the sender will send some packets with necessary information about the file to the receiver that describe a filename, its size and a checksum. The client (receiver) 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.

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● Installation

● From release (Pre-compiled)

• Proceed to releases page
• Choose a version/architecture you have and download an archive
• Unpack an archive
• If on GNU/Linux - run sudo make install

● From source (Compile it yourself) (You need Go and git to be installed on your machine)

• git clone https://github.com/Unbewohnte/ftu.git
• cd into the folder
• make
• If on GNU/Linux - run sudo make install

Now you have ftu installed !

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● Usage

ftu -h - to print a usage message

ftu [FLAGS]

● FLAGs

• -p [Uinteger_here] for port
• -r [true|false] for recursive sending of a directory
• -a [ip_address|domain_name] address to connect to (cannot be used with -s)
• -d [path_to_directory] where the files will be downloaded to (cannot be used with -s)
• -s [path_to_file|directory] to send it (cannot be used with -a)
• -l for license text

● Examples

ftu -p 89898 -s /home/user/Downloads/someVideo.mp4 creates a node on a non-default port 89898 that will send "someVideo.mp4" to the other node that connects to you

ftu -p 7277 -a 192.168.1.104 -d . creates a node that will connect to 192.168.1.104:7277 and download served file|directory to the working directory

ftu -p 7277 -a 192.168.1.104 -d /home/user/Downloads/ creates a node that will connect to 192.168.1.104:7277 and download served file|directory to "/home/user/Downloads/"

ftu -s /home/user/homework creates a node that will send every file in the directory

ftu -r -s /home/user/homework/ creates a node that will send every file in the directory !RECUSRIVELY!

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● Testing

In 'src' directory:

• go test ./... - to test everything
• go test -v ./... - to test everything, with additional information
• go test ./NAME_OF_THE_PACKAGE - to test a certain package

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● 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 the server side has a port-forwarding|virtual server enabled and configured. Fortunatelly, locally it works without any port-forwarding|virtual servers.

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● Inspired by croc

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● License

MIT

● TODO

• Send directory
• Wire back encryption