dns.resolveSoa returns EBADRESP if hostname has a CNAME record

• Version(s): v12.16.3 / v12.18.3 / v12.18.0
• Platform: Windows / Windows Subsystem for Linux (Debian) / Red Hat Enterprise Linux Server release 7.8
• Subsystem: DNS

What steps will reproduce the bug?

const dns = require('dns');
const resolver = new dns.promises.Resolver();

// **************************************************************

async function test(hostname) {
  let data = '';

  console.log('hostname:', hostname);

  try {
    data = await resolver.resolveCname(hostname);
    console.log('CNAME result:', data);
  } catch (error) {
    console.log('CNAME result:', error.message);
  }

  try {
    data = await resolver.resolveSoa(hostname);
    console.log('SOA result:', JSON.stringify(data));
  } catch (error) {
    console.log('SOA result:', error.message);
  }

  console.log();
}

// **************************************************************

(async function main() {
  await test('support.microsoft.com');
})();

Actual Results

hostname: support.microsoft.com
CNAME result: [ 'ev.support.microsoft.com.edgekey.net' ]
SOA result: querySoa EBADRESP support.microsoft.com

Expected Results

hostname: support.microsoft.com
CNAME result: [ 'ev.support.microsoft.com.edgekey.net' ]
SOA result: querySoa ENODATA support.microsoft.com

Additional information

This seems to happen for any hostname with a CNAME record.

Another example:

hostname: store.gocomics.com
CNAME result: [ 'gocomicsstore.wpengine.com' ]
SOA result: querySoa EBADRESP store.gocomics.com

I would expect to get an 'ENODATA' instead of 'EBADRESP', as with the other resolveXXX() calls.

For a hostname with an SOA record but no CNAME, you get:

hostname: microsoft.com
CNAME result: queryCname ENODATA microsoft.com
SOA result: {"nsname":"ns1-205.azure-dns.com","hostmaster":"azuredns-
hostmaster.microsoft.com","serial":1,"refresh":3600,"retry":300,"expire":2419200,"minttl":300}

まず、CNAME レコードを持つホスト名を使って、提供されている dns.promises.Resolver の再現手順を実行し、次に resolveSoa と resolveCname、および想定されるエラー動作を比較します。payload にはソースファイルやテストが記載されていないため、DNS resolver の実装とその resolveSoa テストを見つけます。CNAME のターゲットが EBADRESP ではなく ENODATA を返せば完了です。