Lib.rs

The Quic Copier (qcp) is an experimental high-performance remote file copy utility for long-distance internet connections.

📋 Features

• 🔧 Drop-in replacement for scp or rcp
• 🛡️ Similar security to scp, using existing, well-known mechanisms
• 🚀 Better throughput on congested networks

Platform support status

• Well tested: Debian and Ubuntu using OpenSSH
• Tested: Ubuntu on WSL
• Untested: OSX/BSD family
• Not currently supported: Windows

🧰 Getting Started

• You must have ssh access to the target machine.
• Install the qcp binary on both machines. It needs to be in your PATH on the remote machine.
• Run qcp --help-buffers and follow its instructions.

Install it from crates.io using cargo:

cargo install qcp

Or, clone the repo and build it manually:

git clone https://github.com/crazyscot/qcp
cd qcp
cargo build --release --locked

If you are new to Rust and don't have the tools installed

• Install the rustup tool via your package manager, or see Rust installation
• rustup toolchain install stable
• Proceed as above

⚙️ Usage

The basic syntax is the same as scp or rcp.

You can run the program like this:

$ qcp my-server:/tmp/testfile /tmp/
⠂ Transferring data, instant rate: 2.1MB/s
testfile ████████████████████████████████████░░░░░░░░░░░░░░░░░░░░░░░░ 1s @ 6.71 MB/s [60%/10.49 MB]

The program uses ssh to connect to the target machine and run qcp --server. ssh will check the remote host key and prompt you for a password or passphrase in the usual way.

The default options are for a 100Mbit connection, with 300ms round-trip time to the target server.

You may care to set the options for your internet connection. For example, if you have 300Mbit/s (37.5MB/s) download and 100Mbit/s (12.5MB/s) upload:

qcp my-server:/tmp/testfile /tmp/ --tx 12M --rx 37M

⚖️ License

The initial release is made under the GNU Affero General Public License.

🧑‍🏭 Contributing

Feel free to report bugs via the bug tracker.

I'd particularly welcome performance reports from BSD/OSX users as that's not a platform I use regularly.

While suggestions and feature requests are welcome, please be aware that I mostly work on this project in my own time.

💸 Supporting the project

If you find this software useful and would like to support me, please consider buying me a coffee (or via ko-fi).

If you're a business and need a formal invoice for your accountant, my freelancing company can issue the paperwork. For this, and any other commercial enquiries (alternative licensing, support, sponsoring features) please get in touch.

Please also consider supporting the galaxy of projects this work builds upon. Most notably, Quinn is a pure-Rust implementation of the QUIC protocol, without which qcp simply wouldn't exist in its current form.

💡 Roadmap

Some ideas for the future, in no particular order:

• A local config mechanism, so you don't have to type out the network parameters every time
• Support for copying multiple files (e.g. shell globs or scp -r)
• Windows native support, at least for client mode
• Firewall/NAT traversal
• Interactive file transfer (akin to ftp)
• Smart file copy using the rsync protocol or similar (send only the sections you need to)
• Graphical interface for ftp mode
• Review the protocol and perhaps pivot to using capnp RPC
• Bind a daemon to a fixed port, for better firewall/NAT traversal properties but at the cost of having to implement user authentication.
• The same thing we do every night, Pinky. We try to take over the world!