@nictool/dns-resource-record/rr/cname.js

DNS Resource Records

import RR from '../rr.js'

export default class CNAME extends RR {
  constructor(opts) {
    super(opts)
  }

  /****** Resource record specific setters   *******/
  setCname(val) {
    // A <domain-name> which specifies the canonical or primary
    // name for the owner.  The owner name is an alias.

    if (!val) this.throwHelp('CNAME: cname is required')

    if (this.isIPv4(val) || this.isIPv6(val))
      this.throwHelp(`CNAME: cname must be a FQDN: RFC 2181`)

    if (!this.isFullyQualified('CNAME', 'cname', val)) return
    if (!this.isValidHostname('CNAME', 'cname', val)) return

    // RFC 4034: letters in the DNS names are lower cased
    this.set('cname', val.toLowerCase())
  }

  getDescription() {
    return 'Canonical Name'
  }

  getRdataFields(arg) {
    return ['cname']
  }

  getRFCs() {
    return [1035, 2181]
  }

  getTypeId() {
    return 5
  }

  /******  IMPORTERS   *******/
  fromTinydns(opts) {
    // Cfqdn:p:ttl:timestamp:lo
    const [fqdn, p, ttl, ts, loc] = opts.tinyline.substring(1).split(':')

    return new CNAME({
      owner: this.fullyQualify(fqdn),
      ttl: parseInt(ttl, 10),
      type: 'CNAME',
      cname: this.fullyQualify(p),
      timestamp: ts,
      location: loc !== '' && loc !== '\n' ? loc : '',
    })
  }

  fromBind(opts) {
    // test.example.com  3600  IN  CNAME  ...
    const [owner, ttl, c, type, cname] = opts.bindline.split(/\s+/)
    return new CNAME({
      owner,
      ttl: parseInt(ttl, 10),
      class: c,
      type,
      cname,
    })
  }

  /******  EXPORTERS   *******/

  toTinydns() {
    return `C${this.getTinyFQDN('owner')}:${this.get('cname')}:${this.getTinydnsPostamble()}\n`
  }
}