V2rapper - TCP Proxy

This program is a custom TCP proxy that forwards traffic between a local and remote address. I developed it to monitor v2ray server connections.

It includes features like country-based IP filtering, speed monitoring/throttling, keyword based routing and connection management.

Features

• Keyword based TCP Forwarding: Forwards traffic between a local and remote server based on the incoming connection's header.
• Speed Monitoring: Monitors upload and download speeds, displaying them in real-time, and you can set a limit to drop old connections.
• Connection Management: Handles new connections, ensuring smooth operation under various conditions.
• IP Filtering: Supports country-based whitelisting or blacklisting of IPs using CIDR blocks.

Usage

Run the program with the following command:

go run main.go [options]

Options

• -bind or -b: Address to bind the TCP server to (default :8080).
• -local or -l: IP:Port to forward to if the connection matches a path (default 127.0.0.1:8081).
• -remote or -r: IP:Port to forward to if the connection does not match any paths.
• -country-whitelist or -cw: List of country codes to whitelist (can be specified multiple times).
• -country-blacklist or -cb: List of country codes to blacklist (can be specified multiple times).
• -upload-speed or -us: Maximum upload speed (e.g., 10MB, 10Mb, 10KB).
• -download-speed or -ds: Maximum download speed (e.g., 10MB, 10Mb, 10KB).
• -path or -p: The string to check in the incoming connection to determine routing (can be specified multiple times).

Examples

For example, you run a v2ray vless ws server on 127.0.0.1:8080 and your path is /ws and you want all probes and
other connections to be forwarded to example.com:80. You can run the following command:

go run main.go -b :8080 -l 127.0.0.1:8081 -p "/ws" -r example.com:80

same as above but you want to whitelist Iran and China and drop all other connections:

go run main.go -b :8080 -l 127.0.0.1:8081 -p "/ws" -r example.com:80 -cw ir -cw ch

same as first example, but you want to accept all incoming connections except from US and UK and limit upload and download speed to 10MB:

go run main.go -b :8080 -l 127.0.0.1:8081 -p "/ws" -r example.com:80 -cb us -cb uk -us 10MB -ds 10MB

Installation

Just clone the repository and run the program with the command above in a tmux session or as a service.

Contributing

If you have any suggestions, feel free to open an issue or a pull request. Any contributions you make are greatly appreciated.

License

This project is open-source and available under the MIT License.