Version: 1.0 | Status: Operational | License: MIT

DNSTerm is a next-generation, client-side DNS reconnaissance framework engineered for network analysts, security professionals, and system administrators. It leverages a decentralized, browser-based architecture to perform DNS lookups via DNS-over-HTTPS (DoH), bypassing traditional DNS resolution pathways. This approach enhances privacy and circumvents potential network-level interference or monitoring. The user interface is encapsulated within a retro-futuristic, "hacker-style" terminal aesthetic, providing a high-fidelity, immersive operational experience.

The system is designed as a monolithic, single-file HTML application, ensuring maximum portability and zero-dependency deployment. All requisite components—structural markup (HTML5), styling (CSS3), and logic (ES6 JavaScript)—are embedded within the document.

1. View Layer (DOM & CSS3):

   • Structure: A semantic HTML5 structure defines the application's layout, including the input vector, control surfaces, and the output display buffer.
   • Styling: The visual theme is rendered via CSS3. It employs a CRT (Cathode Ray Tube) monitor simulation, complete with a dark background, phosphor-green text (#00ff41), text-shadowing for a glow effect, and a subtle flickering animation. A scanline overlay further enhances the analog feel. The typography is strictly monospaced to emulate classic terminal environments.

2. Controller & Logic Layer (ES6 JavaScript):

   • Event Handling: An asynchronous event listener is bound to the primary form submission event. This serves as the entry point for the core application logic.
   • Input Sanitization: Domain inputs are trimmed to remove extraneous whitespace before processing.
   • API Abstraction: The fetch API is utilized to interface with the Cloudflare public DoH resolver (1.1.1.1). The request is configured to accept application/dns-json, a standard for receiving DNS data in a structured JSON format.
   • State Management: A simple boolean flag (isTyping) manages the state of the output display, preventing concurrent write operations and ensuring sequential data rendering.

3. Output Subsystem:

   • Typewriter Effect: A recursive typeWriter function simulates real-time data streaming by rendering text character-by-character into the output buffer (<pre> element). This is a crucial component of the user experience, mimicking the data feed of a vintage terminal session.
   • Data Formatting: The raw JSON response from the DoH API is parsed and dynamically reformatted into a human-readable layout, closely resembling the output of the standard dig (Domain Information Groper) command-line utility. This includes distinct sections for the header, question, and answer.
   • Cursor Simulation: A blinking block cursor, achieved through a CSS keyframe animation, is dynamically appended to the output to indicate system readiness or the completion of a write operation.

• Zero-Backend Architecture: Operates entirely within the client's browser, requiring no server-side components.
• Enhanced Privacy: Utilizes DNS-over-HTTPS to encrypt DNS queries, protecting them from eavesdropping.
• dig-like Output: Presents DNS records in a familiar, professional format.
• Immersive UI/UX: Hacker-themed terminal interface provides a unique and engaging user experience.
• Cross-Platform: Runs on any modern web browser that supports HTML5, CSS3, and ES6.
• Portable: Distributed as a single .html file for easy sharing and deployment.

1. Initialization: Upon loading, the system initializes and displays a ready prompt.
2. User Input: The operator enters a target domain name into the input field.
3. Query Submission: The operator triggers the resolution process via the "Resolve" button.
4. Asynchronous Query: The JavaScript logic constructs and dispatches an HTTPS GET request to the Cloudflare DoH endpoint.
5. Response Handling:
   • On Success: The returned JSON payload is parsed. The system formats the header, question, and answer sections and streams the output to the display using the typewriter effect.
   • On Failure: In case of a network error or an invalid API response, a detailed error message is generated and displayed, providing context for diagnostics.
6. Ready State: The system returns to an idle state, awaiting the next command.

• Q2 2025: Implement support for additional DNS record types (e.g., MX, NS, TXT, CNAME).
• Q3 2025: Integrate multiple DoH providers with a user-selectable resolver endpoint.
• Q4 2025: Develop a command history feature, allowing users to recall previous queries.
• Q1 2026: Explore WebAssembly implementation for a high-performance DNS parsing engine.

This document is classified. For internal use only.