DNS server

[gregnr]

Adds basic DNS server. No built-in recursive querying or zone record handling - rather you implement a request() callback that can be used to resolve DNS queries as you wish.

import { createStack } from 'tcpip';
import { createDnsServer, ptrNameToIP } from '@tcpip/dns';

const stack = await createStack();

const tapInterface = await stack.createTapInterface({
  ip: '10.0.0.1/24',
  mac: '02:00:00:00:00:01',
});

const dnsServer = await createDnsServer({
  stack,
  async request(query) {
    const { type, name } = query;

    // Handle A record for example.com
    if (type === 'A' && name === 'example.com') {
      return {
        type,
        ip: '10.0.0.1',
        ttl: 300,
      };
    }

    // Handle reverse lookup for 10.0.0.1
    if (type === 'PTR') {
      const { type: ipType, ip } = ptrNameToIP(name);

      if (ipType === 'ipv4' && ip === '10.0.0.1') {
        return {
          type,
          ptr: 'example.com',
          ttl: 300,
        };
      }
    }
  },
});