Welcome to DNS Logger: Your Ultimate Guide

DNS Logger is a powerful tool designed to help you monitor and manage your DNS queries effectively. Whether you’re a network administrator, security expert, or a developer, this guide will walk you through the various APIs offered by DNS Logger, complete with code snippets and examples to help you get started immediately.

Getting Started with DNS Logger

To begin using DNS Logger, you first need to set up your environment. Below are some quick steps to get you started.

  
  // Install DNS Logger
  npm install dns-logger --save

  // Initialize DNS Logger
  const DNSLogger = require('dns-logger');
  const logger = new DNSLogger();

  // Start monitoring
  logger.start();
  

Key APIs and Code Snippets

1. Monitoring DNS Queries

  
  // Monitor incoming DNS queries
  logger.on('query', (query) => {
    console.log('DNS Query:', query);
  });
  

2. Filtering DNS Queries

  
  // Filter DNS queries based on domain
  logger.filter(domain => domain.includes('example.com'));
  

3. Logging DNS Queries to a File

  
  const fs = require('fs');
  const queryLog = 'dns-queries.log';

  logger.on('query', (query) => {
    fs.appendFile(queryLog, JSON.stringify(query) + '\n', (err) => {
      if (err) throw err;
    });
  });
  

4. Error Handling

  
  // Handle errors during DNS logging
  logger.on('error', (error) => {
    console.error('Error occurred:', error);
  });
  

5. Stopping DNS Logger

  
  // Stop the DNS Logger
  logger.stop();
  

6. Retrieving Logged Data

  
  // Retrieve logged DNS data
  const data = logger.getLogs();
  console.log('Logged DNS Data:', data);
  

Application Example: Building a DNS Monitoring Dashboard

Here is a complete example of building a simple DNS monitoring dashboard application using DNS Logger.

  
  const express = require('express');
  const socketIO = require('socket.io');
  const http = require('http');
  const DNSLogger = require('dns-logger');

  const app = express();
  const server = http.createServer(app);
  const io = socketIO(server);
  const logger = new DNSLogger();

  app.use(express.static('public'));

  logger.on('query', (query) => {
    io.emit('dns-query', query);
  });

  server.listen(3000, () => {
    console.log('Server running on port 3000');
    logger.start();
  });
  

In this example, we use Express and Socket.IO to create a real-time dashboard that displays DNS queries as they are logged.

That’s it! You now have a comprehensive understanding of how to use DNS Logger effectively. Start exploring and optimizing your DNS monitoring today.

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