Bittorrent in GO

This project is a BitTorrent client implemented in Go using the Bittorrent protocol. The client is capable of connecting to peers, requesting pieces of a file, and validating the received pieces using SHA-1 hashes. The main functionality is contained within the main.go file, which handles the connection to peers, sending requests for pieces, and receiving and validating the pieces.

How to Use

1. Clone the repository:

   git clone https://github.com/vg239/bittorrent.git
   cd repository

2. Install dependencies:

   go get ./...

3. Run for an example torrent fie:

   go run src/main.go sample.torrent

   or for some other torrent file

   go run src/main.go <path-to-torrent-file>

The output of the exmaple file can be seen in the sample.txt or in the respective file name.

Working

1. The client starts by reading a .torrent file to extract the necessary metadata, including the info hash, piece length, and the list of peers.
2. It then sends a handshake to each peer and waits for an unchoke message before requesting pieces.
3. Each piece is requested in blocks, and the received data is validated against the expected SHA-1 hash.
4. Validated pieces are stored and eventually written to an output file.

The main.go file includes functions for :

• Creating and sending handshake messages
• Sending requests for pieces
• Receiving pieces
• Validating the received data