Smart SNI and DNS Proxy Server

This DNS Proxy Server is a Go-based server capable of handling both DNS-over-HTTPS (DoH) and DNS-over-TLS (DoT) requests. It features rate limiting and can process DNS queries based on a custom JSON configuration file.

Features

DNS-over-HTTPS (DoH): Accepts and processes DNS queries over HTTPS.
DNS-over-TLS (DoT): Accepts and processes DNS queries over TLS.
Rate Limiting: Throttles the number of requests using a limiter.
Custom Domain Handling: Matches DNS queries to a list of specified domains and returns corresponding IP addresses.
SNI Proxy: Proxies non-matching domains to their respective addresses.
Configurable: Uses a config.json file to define behavior for specified domains.

Configuration

The server uses a config.json file which should be structured as follows:

{
  "host": "your.host.com",
  "domains": {
    "example.com": "1.2.3.4",
    "anotherdomain.com": "1.2.3.4"
  }
}

Replace the IP addresses with your server's public IP to ensure transparent proxying(Here it's 1.2.3.4).

You can use this code to proxy all domains(its not recommended)

{
  "host": "your.host.com",
  "domains": {
    ".": "1.2.3.4"
  }
}

TLS Certificates

The DoT and DOH servers expect TLS certificates to be located at /etc/letsencrypt/live/your.host.com/. Make sure you have valid certificates named fullchain.pem and privkey.pem.

You can obtain a valid certificate for your domain with lets encrypt

Auto Install

bash <(curl -fsSL https://raw.githubusercontent.com/bepass-org/smartSNI/main/install.sh)

Manual Setup

Install Requirements

apt update
apt install nginx certbot python3-certbot-nginx
snap install go --classic

Change server_name in /etc/nginx/sites-enabled/default to your domain
Obtain a valid certificate for nginx

certbot --nginx -d <YOUR_DOMAIN>

Clone the repository to your local machine.
Create and configure your config.json file.
Run go build to compile the server.
Run the compiled binary to start the server in tmux or in background with nohup.

./name-of-compiled-binary

Rate Limiting

The server uses the golang.org/x/time/rate package to implement rate limiting. You can adjust the rate limiter in the main function to suit your needs.

Contributions

Contributions to this project are welcome. Please fork the repository, make your changes, and submit a pull request.

Credits

Special thanks to Peyman for auto install script

License

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

ErfanTech/smartSNI