BitTorrent-CPP

A simple BitTorrent CLI client written in C++. It supports downloading from both .torrent files and magnet links, with piece-level control for magnet downloads.

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✨ Features

• Download files using a .torrent file.
• Download specific pieces from a magnet link.
• Command-line interface (no GUI).
• Lightweight and minimal dependencies.

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⚡ Usage

Build

git clone https://github.com/rahulsenna/bittorrent-cpp.git
cd bittorrent-cpp
mkdir build && cd build
cmake ..
make

The binary will be available in the build/ directory.

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Commands

1. Download with .torrent file

./bittorrent-cpp download -o out_file sample.torrent

• -o out_file → output file path
• sample.torrent → path to the torrent file

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2. Download specific piece from a magnet link

./bittorrent-cpp magnet_download_piece -o out_file "<magnet-link>" <piece_index>

• -o out_file → output file path
• <magnet-link> → the magnet URI
• <piece_index> → index of the piece to download

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📂 Example

./bittorrent-cpp download -o ubuntu.iso ubuntu.torrent

./bittorrent-cpp magnet_download_piece -o chunk.bin "magnet:?xt=urn:btih:..." 5

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🚧 Status

This project is under active development. Currently supports:

• Parsing .torrent files
• Parsing magnet URIs
• Downloading via BitTorrent protocol

Planned improvements:

• Multi-piece downloads for magnet links
• Peer management & choking/unchoking
• Upload/seeding support

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🤝 Contributing

Contributions, issues, and feature requests are welcome! Feel free to fork the repo and submit a PR.

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📜 License

This project is licensed under the MIT License – see the LICENSE file for details.