Fast DNS Record Checker

fast-dns-checker.js

const { argv } = require('node:process');
const dns = require('node:dns').promises;

const ALLOWED_RECORD_TYPES  = ['A', 'AAAA', 'ANY', 'CAA', 'CNAME', 'MX', 'NS', 'NAPTR', 'PTR', 'SOA', 'SRV', 'TXT']

async function checkDNSRecord(domain, value, recordType = 'A'){
    return new Promise(async (resolve, _) => {
        try{
            const resolver = new dns.Resolver();
            const apexDomain = domain.split('.').splice(-2).join('.')
            const nsRecords  = await resolver.resolve(apexDomain, 'NS')
            const nsServerIps = await Promise.all(nsRecords.map(nsRecord => { return resolver.resolve(nsRecord, 'A')}))
            resolver.setServers(nsServerIps.flat())
            const records = await resolver.resolve(domain, recordType)
            console.log(records)
            resolve(records.includes(value))
        }
        catch(err){
            console.log(err)
            resolve(false)
        }
    })
}

(async() => {
    const domain = argv[2]
    const value = argv[3]
    if(!domain || !value){
        throw new Error(`Domain and Value arguments are required`)
    }
    const recordType = argv[4]
    if(recordType && !ALLOWED_RECORD_TYPES.includes(recordType)){
        throw new Error(`Record type not allowed. Valid types are ${ALLOWED_RECORD_TYPES.join(', ')}`)
    }
    const isRecordMatch = await checkDNSRecord(domain, value, recordType)
    console.log(isRecordMatch)
})()

// usage : node fast-dns-checker.js <domain> <record-value> <record-type>
// example : node fast-dns-checker.js dukn.site 192.0.0.1 A