DNS-Over-TLS

The implementation is based on an awesome dns library from Miek Gieben. The implementation starts a tcp and a udp server on 53 port and uses Cloudflare DNS over TLS as a upstream DNS resolver.

Build

To build the project Makefile is provided. cd into the directory and run the following command.

$ make build

The above command builds the project and creates a docker image abhinav/dns-client-proxy. Thereafter removing the build binary.

Run

To run the container use the following command.

$ sudo docker run -d --rm -p53:53 -p53:53/udp abhinav/dns-client-proxy

This will start the server on 127.0.0.1:53 binding localhost 53 port.

Test

To test the application on linux you can use dig command.

$ dig @127.0.0.1 www.zomato.com

If everything goes well you may see the dig output. The dig is communicating to localhost at 53 port which in turn uses cloudflare DNS for resolution