The dpt-tool is a utility written in Python 3 designed to test various basic properties of public DNS servers. It provides a simple way to examine and analyze the supported features of these servers through a command-line interface.

To install the dpt-tool, use the following command:

pip install -r requirements.txt

This will resolve the necessary dependencies for the tool to run.

To use the tool, you can follow the example commands below.

python main.py -c all

python main.py -c udp_payload_size, do_bit -s '{"Cloudflare": ["1.1.1.1", "1.0.0.1"], "Google Public DNS": ["8.8.8.8"]}' -o output.txt

The available test options are:

• opt_record: Support OPT Record (RFC 6891)
• udp_payload_size: Default UDP payload size
• client_subnet: Client Subnet (RFC 7871)
• nsid: NSID (RFC 5001)
• version_bind: version.bind CHAOS/TXT
• server_id: id.server CHAOS/TXT
• do_bit: DO bit
• response_validation: Response validation
• dnskey_algorithm: DNSKEY algorithms (RFC 8624)
• dot: DNS-over-TLS (RFC 7858)
• doh: DNS-over-HTTPS (RFC 8484)
• 0x20: 0x20 encoding
• ede: EDNS Extended Errors (EDE)

For specifying the DNS servers, the input must be in JSON format containing a dictionary of server names mapped to a list of IP addresses for each server.

Feedback and contributions are welcome! If you encounter any issues or have ideas for improvements, please feel free to open an issue or a pull request on the GitHub repository.