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dns: resolve cname records using unbound

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cname record can be external and the original NS may not respond to
recursive queries
This commit is contained in:
Girish Ramakrishnan
2023-01-25 09:57:07 +01:00
parent 917b6d113b
commit e4d9dbb558
1 changed files with 4 additions and 3 deletions
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7
src/dns/waitfordns.js
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@@ -7,7 +7,8 @@ const assert = require('assert'),
debug = require('debug')('box:dns/waitfordns'),
dig = require('../dig.js'),
promiseRetry = require('../promise-retry.js'),
safe = require('safetydance');
safe = require('safetydance'),
_ = require('underscore');
async function resolveIp(hostname, type, options) {
assert.strictEqual(typeof hostname, 'string');
@@ -20,12 +21,12 @@ async function resolveIp(hostname, type, options) {
if (!error && results.length !== 0) return results;
// try CNAME record at authoritative server
debug(`resolveIp: Checking if ${hostname} has CNAME record at ${options.server}`);
debug(`resolveIp: No A record. Checking if ${hostname} has CNAME record at ${options.server}`);
const cnameResults = await dig.resolve(hostname, 'CNAME', options);
if (cnameResults.length === 0) return cnameResults;
// recurse lookup the CNAME record
debug(`resolveIp: Resolving ${hostname}'s CNAME record ${cnameResults[0]}`);
debug(`resolveIp: CNAME record found. Resolving ${hostname}'s CNAME record ${cnameResults[0]} using unbound`);
return await dig.resolve(cnameResults[0], type, options);
}