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<!DOCTYPE html>
<html lang="en" data-bs-theme="dark">
<head>
<meta charset="utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1" />
<title>DNS Resource Record Builder – NicTool</title>
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bootstrap@5.3.8/dist/css/bootstrap.min.css"
integrity="sha384-sRIl4kxILFvY47J16cr9ZwB07vP4J8+LH7qKQnuqkuIAvNWLzeN8tE5YBujZqJLB" crossorigin="anonymous" />
<link rel="stylesheet" href="../css/nictool.css" />
<style>
/* Monospace output */
textarea.mono, input.mono {
font-family: 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, monospace;
font-size: .82rem;
}
/* Field hints */
.field-hint { font-size: .72rem; opacity: .55; font-weight: 400; }
/* Format output blocks */
.fmt-label { font-weight: 600; font-size: .85rem; margin-bottom: .3rem; }
.fmt-sublabel { font-size: .72rem; opacity: .5; margin-left: .4rem; font-weight: 400; }
.fmt-textarea { resize: vertical; min-height: 2.6rem; }
/* Copy button */
.copy-btn { min-width: 4.8rem; font-size: .78rem; transition: all .18s; }
.copy-btn.ok { background: var(--bs-success); border-color: var(--bs-success); color: #fff; }
/* Error area */
#rrError { white-space: pre-wrap; font-family: monospace; font-size: .8rem; }
/* Type selector */
#rrType { font-weight: 500; }
/* Loading overlay */
#loadingOverlay {
position: fixed; inset: 0; background: rgba(17,24,39,.85);
display: flex; align-items: center; justify-content: center;
z-index: 9999; transition: opacity .3s;
}
#loadingOverlay.hidden { opacity: 0; pointer-events: none; }
/* Rdata field rows */
#rrRdataFields .col-rr { margin-bottom: .1rem; }
/* RFC badge */
.rfc-badge {
font-size: .7rem; padding: .15rem .45rem;
border-radius: 3px; background: rgba(99,179,237,.15);
color: #63b3ed; border: 1px solid rgba(99,179,237,.25);
}
</style>
</head>
<body>
<!-- Loading overlay -->
<div id="loadingOverlay">
<div class="text-center text-light">
<div class="spinner-border mb-3" style="width:2.5rem;height:2.5rem" role="status"></div>
<div class="small">Loading dns-resource-record…</div>
</div>
</div>
<nav class="navbar navbar-expand-sm py-2 nt-navbar">
<div class="container px-4">
<a class="navbar-brand" href="../index.html">NicTool</a>
<button class="navbar-toggler border-0" type="button" data-bs-toggle="collapse" data-bs-target="#navMain">
<span class="navbar-toggler-icon"></span>
</button>
<div class="collapse navbar-collapse" id="navMain">
<ul class="navbar-nav ms-auto gap-1">
<li class="nav-item">
<a class="nav-link" href="../index.html">Home</a>
</li>
<li class="nav-item">
<a class="nav-link active" href="index.html">Builder</a>
</li>
<li class="nav-item">
<a class="nav-link" href="../dictionary.html">Dictionary</a>
</li>
<li class="nav-item">
<a class="nav-link" href="https://github.com/orgs/NicTool/discussions" target="_blank" rel="noopener">Discussions</a>
</li>
</ul>
</div>
</div>
</nav>
<main class="container-xl py-4 px-3 px-md-4">
<!-- Page header -->
<div class="mb-4">
<h1 class="h4 mb-1 fw-bold">DNS Resource Record Builder</h1>
<p class="text-muted small mb-0">
Generate DNS RRs in <strong>BIND / RFC 1035</strong>, <strong>tinydns</strong>,
<strong>MaraDNS</strong>, and <strong>wire</strong> formats — powered by
<a href="https://github.com/NicTool/dns-resource-record" target="_blank"
rel="noopener" class="link-info">@nictool/dns-resource-record</a>.
</p>
</div>
<!-- ── Record type selector ───────────────────────────────────────── -->
<div class="card mb-3">
<div class="card-body py-3">
<div class="row g-3 align-items-center">
<div class="col-sm-4 col-lg-3">
<label for="rrType" class="form-label small text-uppercase text-secondary fw-semibold mb-1">
Record Type
</label>
<select id="rrType" class="form-select">
<option value="">Loading…</option>
</select>
</div>
<div class="col-sm-8 col-lg-9">
<div id="rrDescription" class="fs-5 fw-semibold text-info mb-1">—</div>
<div id="rrRfcBadges" class="d-flex flex-wrap gap-1"></div>
</div>
</div>
</div>
</div>
<!-- ── Record fields ──────────────────────────────────────────────── -->
<div class="card mb-3">
<div class="card-header py-2 d-flex align-items-center justify-content-between">
<span class="fw-semibold small">Record Fields</span>
<button id="loadExampleBtn" class="btn btn-sm btn-outline-secondary py-0" style="font-size:.75rem">
Load example
</button>
</div>
<div class="card-body pb-3 pt-3">
<!-- Common fields: owner / TTL / class -->
<div class="row g-3 mb-3">
<div class="col-md-7">
<label for="field-owner" class="form-label small fw-semibold mb-1">
Owner
<span class="field-hint">fully qualified — must end with .</span>
</label>
<input type="text" id="field-owner" class="form-control form-control-sm mono"
placeholder="host.example.com."
autocorrect="off" autocapitalize="none" spellcheck="false" />
</div>
<div class="col-md-3">
<label for="field-ttl" class="form-label small fw-semibold mb-1">
TTL
<span class="field-hint js-ttl-human"></span>
</label>
<input type="number" id="field-ttl" class="form-control form-control-sm"
value="3600" min="0" max="2147483647" />
</div>
<div class="col-md-2">
<label for="field-class" class="form-label small fw-semibold mb-1">Class</label>
<select id="field-class" class="form-select form-select-sm">
<option value="IN" selected>IN</option>
<option value="CH">CH</option>
<option value="HS">HS</option>
</select>
</div>
</div>
<!-- Dynamic rdata fields injected here -->
<div id="rrRdataFields" class="row g-3"></div>
</div>
</div>
<!-- ── Validation error ───────────────────────────────────────────── -->
<div id="rrError" class="alert alert-danger mb-3 d-none py-2" role="alert"></div>
<!-- ── Output formats ────────────────────────────────────────────── -->
<div class="card">
<div class="card-header py-2 fw-semibold small">Output Formats</div>
<div class="card-body py-3">
<div class="row g-4">
<!-- BIND / RFC 1035 -->
<div class="col-12">
<div class="d-flex justify-content-between align-items-center mb-1">
<div class="fmt-label">
BIND / RFC 1035
<span class="fmt-sublabel">ISC BIND, Knot, NSD, PowerDNS…</span>
</div>
<button class="btn btn-sm btn-outline-secondary copy-btn" data-target="out-bind">Copy</button>
</div>
<textarea id="out-bind" class="form-control mono fmt-textarea" rows="2" readonly
placeholder="Fill in the fields above…"></textarea>
</div>
<!-- tinydns -->
<div class="col-12">
<div class="d-flex justify-content-between align-items-center mb-1">
<div class="fmt-label">
tinydns
<span class="fmt-sublabel">djbdns / tinydns data file</span>
</div>
<button class="btn btn-sm btn-outline-secondary copy-btn" data-target="out-tinydns">Copy</button>
</div>
<textarea id="out-tinydns" class="form-control mono fmt-textarea" rows="2" readonly></textarea>
</div>
<!-- MaraDNS -->
<div class="col-12">
<div class="d-flex justify-content-between align-items-center mb-1">
<div class="fmt-label">
MaraDNS
<span class="fmt-sublabel">MaraDNS zone file</span>
</div>
<button class="btn btn-sm btn-outline-secondary copy-btn" data-target="out-maradns">Copy</button>
</div>
<textarea id="out-maradns" class="form-control mono fmt-textarea" rows="2" readonly></textarea>
</div>
<!-- Wire -->
<div class="col-12">
<div class="d-flex justify-content-between align-items-center mb-1">
<div class="fmt-label">
Wire
<span class="fmt-sublabel">binary wire format, hex encoded</span>
</div>
<button class="btn btn-sm btn-outline-secondary copy-btn" data-target="out-wire">Copy</button>
</div>
<textarea id="out-wire" class="form-control mono fmt-textarea" rows="3" readonly></textarea>
</div>
</div>
</div>
</div>
<p class="text-muted small mt-4 text-center">
Powered by
<a href="https://github.com/NicTool/dns-resource-record" target="_blank" rel="noopener"
class="link-secondary">@nictool/dns-resource-record</a>
·
Inspired by
<a href="https://andersbrownworth.com/projects/sysadmin/djbdnsRecordBuilder/" target="_blank"
rel="noopener" class="link-secondary">andersbrownworth.com</a>
</p>
</main>
<script src="https://cdn.jsdelivr.net/npm/bootstrap@5.3.8/dist/js/bootstrap.bundle.min.js"
integrity="sha384-FKyoEForCGlyvwx9Hj09JcYn3nv7wiPVlz7YYwJrWVcXK/BmnVDxM+D2scQbITxI"
crossorigin="anonymous"></script>
<script type="module">
// ─────────────────────────────────────────────────────────────────────────────
// 1. Import dns-resource-record. v1.7.0+ uses Uint8Array/DataView natively —
// no Buffer polyfill needed.
// ─────────────────────────────────────────────────────────────────────────────
const RR = await import('https://cdn.jsdelivr.net/npm/@nictool/dns-resource-record@1.7.0/dist/dns-rr.min.js')
// ─────────────────────────────────────────────────────────────────────────────
// 2. Constants
// ─────────────────────────────────────────────────────────────────────────────
const TAG_TO_GROUP = {
common: 'Common',
security: 'Security',
dnssec: 'DNSSEC',
deprecated: 'Deprecated',
obsolete: 'Obsolete',
}
const GROUP_ORDER = ['Common', 'Less Common', 'Security', 'DNSSEC', 'Deprecated', 'Obsolete']
// Fields that get a <textarea> instead of a single-line <input>
const LARGE_FIELDS = new Set([
'data', 'certificate association data', 'fingerprint', 'public key',
'key tag', 'public key', 'digest', 'hit', 'public key', 'rendezvous servers',
'signature', 'key data', 'next domain name', 'type bit maps',
])
// Fields that are FQDN domain names (hint about trailing dot)
const FQDN_FIELDS = new Set([
'exchange', 'target', 'nsdname', 'dname', 'cname', 'mname', 'rname',
'replacement', 'signer name', 'next',
])
// ─────────────────────────────────────────────────────────────────────────────
// 3. Helpers
// ─────────────────────────────────────────────────────────────────────────────
function ucFirst(str) {
return str.split(/\s+/).map(w => w.charAt(0).toUpperCase() + w.slice(1)).join('')
}
function titleCase(str) {
return str.split(/\s+/).map(w => w.charAt(0).toUpperCase() + w.slice(1)).join(' ')
}
function htmlEsc(s) {
return String(s ?? '')
.replace(/&/g, '&')
.replace(/"/g, '"')
.replace(/</g, '<')
.replace(/>/g, '>')
}
function humanTtl(secs) {
if (!secs && secs !== 0) return ''
if (secs < 60) return `${secs}s`
if (secs < 3600) return `${secs / 60}m`
if (secs % 3600 === 0 && secs < 86400) return `${secs / 3600}h`
if (secs % 86400 === 0 && secs < 604800) return `${secs / 86400}d`
if (secs % 604800 === 0) return `${secs / 604800}w`
const h = Math.floor(secs / 3600)
const m = Math.floor((secs % 3600) / 60)
return h ? `${h}h ${m}m` : `${m}m`
}
function getGroupForInstance(inst) {
const tags = inst.getTags?.() ?? []
for (const [tag, group] of Object.entries(TAG_TO_GROUP)) {
if (tags.includes(tag)) return group
}
return 'Less Common'
}
// Collect all exported RR classes (skip 'default' base class and 'typeMap')
const SKIP = new Set(['default', 'typeMap'])
const ALL_TYPES = {}
for (const [name, val] of Object.entries(RR)) {
if (!SKIP.has(name) && typeof val === 'function') {
ALL_TYPES[name] = val
}
}
// ─────────────────────────────────────────────────────────────────────────────
// 4. Build the <select> type selector grouped by category
// ─────────────────────────────────────────────────────────────────────────────
function buildTypeSelector() {
const grouped = {}
for (const name of GROUP_ORDER) grouped[name] = []
for (const [name, cls] of Object.entries(ALL_TYPES)) {
try {
const inst = new cls(null)
grouped[getGroupForInstance(inst)].push(name)
} catch { /* skip broken entries */ }
}
const sel = document.getElementById('rrType')
sel.innerHTML = ''
for (const groupName of GROUP_ORDER) {
const names = (grouped[groupName] ?? []).sort()
if (!names.length) continue
const og = document.createElement('optgroup')
og.label = groupName
for (const name of names) {
const opt = document.createElement('option')
opt.value = name
opt.textContent = name
og.appendChild(opt)
}
sel.appendChild(og)
}
sel.value = 'A'
}
// ─────────────────────────────────────────────────────────────────────────────
// 5. Render rdata field inputs for the chosen type
// ─────────────────────────────────────────────────────────────────────────────
function renderRdataFields(typeName) {
const cls = ALL_TYPES[typeName]
if (!cls) return
const inst = new cls(null)
const canonical = inst.getCanonical?.() ?? {}
const rdataFlds = inst.getRdataFields?.() ?? []
// Update description
document.getElementById('rrDescription').textContent = inst.getDescription?.() || typeName
// RFC badges
const badgesEl = document.getElementById('rrRfcBadges')
badgesEl.innerHTML = ''
for (const rfc of (inst.getRFCs?.() ?? [])) {
const a = document.createElement('a')
a.href = `https://www.rfc-editor.org/rfc/rfc${rfc}`
a.target = '_blank'; a.rel = 'noopener'
a.className = 'rfc-badge text-decoration-none'
a.textContent = `RFC ${rfc}`
badgesEl.appendChild(a)
}
// Set canonical owner/ttl defaults (only when switching type)
if (canonical.owner) document.getElementById('field-owner').value = canonical.owner
if (canonical.ttl) document.getElementById('field-ttl').value = canonical.ttl
// Build dynamic rdata field elements
const container = document.getElementById('rrRdataFields')
container.innerHTML = ''
for (const fieldName of rdataFlds) {
const optionsMethod = `get${ucFirst(fieldName)}Options`
const options = typeof inst[optionsMethod] === 'function' ? inst[optionsMethod]() : null
const canonVal = canonical[fieldName]
const isNumeric = typeof canonVal === 'number'
const safeId = `rdf-${fieldName.replace(/\s+/g, '-')}`
const labelText = titleCase(fieldName)
const isFqdn = FQDN_FIELDS.has(fieldName)
const isLarge = LARGE_FIELDS.has(fieldName)
const col = document.createElement('div')
if (options) {
// ── Select (enumerated options) ──────────────────────────────────
const firstKey = options.keys().next().value
const keysNumeric = typeof firstKey === 'number'
col.className = 'col-md-6'
const optionsHtml = [...options.entries()].map(([k, v]) => {
const display = v != null ? `${k} – ${v}` : (k === '' ? '(empty)' : String(k))
const sel = String(k) === String(canonVal) ? ' selected' : ''
return `<option value="${htmlEsc(k)}"${sel}>${htmlEsc(display)}</option>`
}).join('')
col.innerHTML = `
<label for="${safeId}" class="form-label small fw-semibold mb-1">${htmlEsc(labelText)}</label>
<select id="${safeId}" data-field="${htmlEsc(fieldName)}"
data-numeric="${keysNumeric}" class="form-select form-select-sm rr-field">
${optionsHtml}
</select>`
} else if (isLarge) {
// ── Textarea (long text fields) ──────────────────────────────────
col.className = 'col-12'
col.innerHTML = `
<label for="${safeId}" class="form-label small fw-semibold mb-1">${htmlEsc(labelText)}</label>
<textarea id="${safeId}" data-field="${htmlEsc(fieldName)}"
class="form-control form-control-sm mono rr-field fmt-textarea"
rows="3" autocorrect="off" autocapitalize="none"
spellcheck="false"></textarea>`
// Set value via DOM to avoid HTML encoding issues
col.querySelector('textarea').value = String(canonVal ?? '')
} else if (isNumeric) {
// ── Number input ─────────────────────────────────────────────────
col.className = 'col-md-4 col-sm-6'
col.innerHTML = `
<label for="${safeId}" class="form-label small fw-semibold mb-1">${htmlEsc(labelText)}</label>
<input type="number" id="${safeId}" data-field="${htmlEsc(fieldName)}"
data-numeric="true" class="form-control form-control-sm rr-field"
value="${canonVal ?? 0}" min="0" />`
} else {
// ── Text input ───────────────────────────────────────────────────
col.className = 'col-md-6'
const hint = isFqdn ? '<span class="field-hint ms-1">FQDN, ends with .</span>' : ''
col.innerHTML = `
<label for="${safeId}" class="form-label small fw-semibold mb-1">${htmlEsc(labelText)}${hint}</label>
<input type="text" id="${safeId}" data-field="${htmlEsc(fieldName)}"
class="form-control form-control-sm mono rr-field"
autocorrect="off" autocapitalize="none" spellcheck="false" />`
col.querySelector('input').value = String(canonVal ?? '')
}
container.appendChild(col)
}
}
// ─────────────────────────────────────────────────────────────────────────────
// 6. Collect form values → build RR → render all output formats
// ─────────────────────────────────────────────────────────────────────────────
function updateOutput() {
const typeName = document.getElementById('rrType').value
if (!typeName) return
const cls = ALL_TYPES[typeName]
if (!cls) return
const errorEl = document.getElementById('rrError')
// Collect common fields
const opts = {
owner : document.getElementById('field-owner').value.trim(),
ttl : parseInt(document.getElementById('field-ttl').value, 10) || 3600,
class : document.getElementById('field-class').value,
type : typeName,
}
// Collect rdata fields
for (const el of document.querySelectorAll('.rr-field')) {
const field = el.dataset.field
if (!field) continue
if (el.dataset.numeric === 'true') {
opts[field] = parseInt(el.value, 10)
if (isNaN(opts[field])) opts[field] = 0
} else {
opts[field] = el.tagName === 'TEXTAREA' ? el.value : el.value
}
}
try {
const rr = new cls(opts)
setOut('out-bind', tryCall(() => rr.toBind?.().trim()))
setOut('out-tinydns', tryCall(() => rr.toTinydns?.().trim()))
setOut('out-maradns', tryCall(() => rr.toMaraDNS?.().trim()))
// Wire: toWire() returns a Buffer; display as spaced hex
setOut('out-wire', tryCall(() => {
const bytes = rr.toWire()
const hex = Array.from(bytes).map(b => b.toString(16).padStart(2, '0')).join(' ')
return `${hex}\n; ${bytes.length} bytes`
}))
errorEl.classList.add('d-none')
errorEl.textContent = ''
} catch (e) {
errorEl.textContent = e.message
errorEl.classList.remove('d-none')
for (const id of ['out-bind', 'out-tinydns', 'out-maradns', 'out-wire']) {
document.getElementById(id).value = ''
}
}
}
function setOut(id, value) {
const el = document.getElementById(id)
if (el) el.value = value ?? ''
}
function tryCall(fn) {
try {
return fn()
} catch (e) {
return `; Error: ${e.message}`
}
}
// ─────────────────────────────────────────────────────────────────────────────
// 7. Load example values from getCanonical()
// ─────────────────────────────────────────────────────────────────────────────
function loadExample() {
const typeName = document.getElementById('rrType').value
const cls = ALL_TYPES[typeName]
if (!cls) return
const inst = new cls(null)
const canonical = inst.getCanonical?.() ?? {}
if (canonical.owner) document.getElementById('field-owner').value = canonical.owner
if (canonical.ttl) document.getElementById('field-ttl').value = canonical.ttl
for (const el of document.querySelectorAll('.rr-field')) {
const field = el.dataset.field
if (field === undefined || !(field in canonical)) continue
if (el.tagName === 'SELECT') {
el.value = String(canonical[field])
} else {
el.value = String(canonical[field] ?? '')
}
}
updateTtlDisplay()
updateOutput()
}
// ─────────────────────────────────────────────────────────────────────────────
// 8. Copy-to-clipboard buttons
// ─────────────────────────────────────────────────────────────────────────────
function setupCopyButtons() {
document.querySelectorAll('.copy-btn').forEach(btn => {
btn.addEventListener('click', () => {
const ta = document.getElementById(btn.dataset.target)
if (!ta?.value) return
const reset = () => {
btn.textContent = 'Copy'
btn.classList.remove('ok', 'btn-success')
btn.classList.add('btn-outline-secondary')
}
const markCopied = () => {
btn.textContent = '✓ Copied'
btn.classList.add('ok', 'btn-success')
btn.classList.remove('btn-outline-secondary')
setTimeout(reset, 1800)
}
if (navigator.clipboard?.writeText) {
navigator.clipboard.writeText(ta.value).then(markCopied).catch(() => {
ta.select(); document.execCommand('copy'); markCopied()
})
} else {
ta.select(); document.execCommand('copy'); markCopied()
}
})
})
}
// ─────────────────────────────────────────────────────────────────────────────
// 9. TTL human-readable display
// ─────────────────────────────────────────────────────────────────────────────
function updateTtlDisplay() {
const ttl = parseInt(document.getElementById('field-ttl').value, 10)
for (const s of document.querySelectorAll('.js-ttl-human')) {
s.textContent = isNaN(ttl) ? '' : `(${humanTtl(ttl)})`
}
}
// ─────────────────────────────────────────────────────────────────────────────
// 10. Wire up all events
// ─────────────────────────────────────────────────────────────────────────────
function attachEvents() {
document.getElementById('rrType').addEventListener('change', e => {
renderRdataFields(e.target.value)
updateTtlDisplay()
updateOutput()
})
document.getElementById('field-owner').addEventListener('input', updateOutput)
document.getElementById('field-ttl').addEventListener('input', () => {
updateTtlDisplay(); updateOutput()
})
document.getElementById('field-class').addEventListener('change', updateOutput)
// FQDN auto-dot on blur for owner
document.getElementById('field-owner').addEventListener('blur', e => {
const v = e.target.value.trim()
if (v && !v.endsWith('.')) {
e.target.value = v + '.'
updateOutput()
}
})
// Delegate rdata field changes
const rdataContainer = document.getElementById('rrRdataFields')
rdataContainer.addEventListener('input', updateOutput)
rdataContainer.addEventListener('change', updateOutput)
// Auto-dot for FQDN rdata fields on blur
rdataContainer.addEventListener('focusout', e => {
const el = e.target
if (!el.classList.contains('rr-field')) return
if (el.type !== 'text') return
if (!FQDN_FIELDS.has(el.dataset.field)) return
const v = el.value.trim()
if (v && !v.endsWith('.')) {
el.value = v + '.'
updateOutput()
}
})
document.getElementById('loadExampleBtn').addEventListener('click', loadExample)
}
// ─────────────────────────────────────────────────────────────────────────────
// 11. Init
// ─────────────────────────────────────────────────────────────────────────────
buildTypeSelector()
attachEvents()
setupCopyButtons()
renderRdataFields('A')
updateTtlDisplay()
updateOutput()
// Hide loading overlay
const overlay = document.getElementById('loadingOverlay')
overlay.classList.add('hidden')
setTimeout(() => overlay.remove(), 350)
</script>
</body>
</html>