commit 4decb6ec51c521f9d0967d944bc6f6bc3bb185f6 Author: Arvin Date: Thu May 28 07:21:47 2026 +0000 Initial commit diff --git a/.gitignore b/.gitignore new file mode 100644 index 0000000..518b395 --- /dev/null +++ b/.gitignore @@ -0,0 +1,15 @@ +node_modules/ +.env +*.log +.DS_Store + +# backups +public/index.html.backup +public/index.html.save + +# certificates / private keys +*.key +*.pem +*.crt +cert/ +ssl/ diff --git a/index.html b/index.html new file mode 100644 index 0000000..e8a9248 --- /dev/null +++ b/index.html @@ -0,0 +1,623 @@ +\ + + + + + + + DNS Checker + + + +
+
+
+
DNS propagation checker
+

Check DNS records from Iran

+

Search A, AAAA, NS, CNAME and MX records using our Iran DNS agent.

+
+ +
+
+ +
+ + +
+ + + + + + + + + +
+
+ +
+ +
+ Current location: Iran / Tehran +
+ +
+
+ +
+
+
+
Iran / Tehran
+
+
+
success
+
+ +
+ +
+
Response time: -
+
+
+
+
+ + + + diff --git a/package-lock.json b/package-lock.json new file mode 100644 index 0000000..569ecfd --- /dev/null +++ b/package-lock.json @@ -0,0 +1,841 @@ +{ + "name": "dns-checker-app", + "version": "1.0.0", + "lockfileVersion": 3, + "requires": true, + "packages": { + "": { + "name": "dns-checker-app", + "version": "1.0.0", + "license": "ISC", + "dependencies": { + "cors": "^2.8.6", + "express": "^5.2.1", + "express-rate-limit": "^8.5.2", + "helmet": "^8.2.0" + } + }, + "node_modules/accepts": { + "version": "2.0.0", + "resolved": "https://registry.npmjs.org/accepts/-/accepts-2.0.0.tgz", + "integrity": "sha512-5cvg6CtKwfgdmVqY1WIiXKc3Q1bkRqGLi+2W/6ao+6Y7gu/RCwRuAhGEzh5B4KlszSuTLgZYuqFqo5bImjNKng==", + "dependencies": { + "mime-types": "^3.0.0", + "negotiator": "^1.0.0" + }, + "engines": { + "node": ">= 0.6" + } + }, + "node_modules/body-parser": { + "version": "2.2.2", + "resolved": "https://registry.npmjs.org/body-parser/-/body-parser-2.2.2.tgz", + "integrity": 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+ "resolved": "https://registry.npmjs.org/wrappy/-/wrappy-1.0.2.tgz", + "integrity": "sha512-l4Sp/DRseor9wL6EvV2+TuQn63dMkPjZ/sp9XkghTEbV9KlPS1xUsZ3u7/IQO4wxtcFB4bgpQPRcR3QCvezPcQ==" + } + } +} diff --git a/package.json b/package.json new file mode 100644 index 0000000..344a260 --- /dev/null +++ b/package.json @@ -0,0 +1,18 @@ +{ + "name": "dns-checker-app", + "version": "1.0.0", + "description": "", + "main": "index.js", + "scripts": { + "test": "echo \"Error: no test specified\" && exit 1" + }, + "keywords": [], + "author": "", + "license": "ISC", + "dependencies": { + "cors": "^2.8.6", + "express": "^5.2.1", + "express-rate-limit": "^8.5.2", + "helmet": "^8.2.0" + } +} diff --git a/public/app.js b/public/app.js new file mode 100644 index 0000000..1cc85c1 --- /dev/null +++ b/public/app.js @@ -0,0 +1,306 @@ +const form = document.getElementById("dnsForm"); +const domainInput = document.getElementById("domainInput"); +const recordDropdown = document.getElementById("recordDropdown"); +const recordTrigger = document.getElementById("recordTrigger"); +const recordMenu = document.getElementById("recordMenu"); +const selectedRecord = document.getElementById("selectedRecord"); +const selectedRecordDesc = document.getElementById("selectedRecordDesc"); +const checkButton = document.getElementById("checkButton"); +const errorBox = document.getElementById("errorBox"); +const resultsContainer = document.getElementById("resultsContainer"); +const userIpText = document.getElementById("userIpText"); + + +let selectedRecordType = "A"; + +function showError(message) { + errorBox.style.display = "block"; + errorBox.textContent = message; +} + +function hideError() { + errorBox.style.display = "none"; + errorBox.textContent = ""; +} + +function formatDnsError(error) { + if (!error) { + return "DNS lookup failed."; + } + + if ( + error === "ESERVFAIL" || + error === "SERVFAIL" || + error.includes("server failed") + ) { + return "Destination DNS server did not respond with a valid answer."; + } + + if (error.includes("No") && error.includes("record found")) { + return error; + } + + if (error.includes("Domain not found")) { + return "Domain was not found."; + } + + if (error.includes("timed out") || error.includes("TIMEOUT")) { + return "DNS lookup timed out."; + } + + return error; +} + +function isPrivateIp(ip) { + if (typeof ip !== "string") return false; + + const parts = ip.split(".").map(Number); + + if (parts.length !== 4 || parts.some(part => Number.isNaN(part))) { + return false; + } + + const a = parts[0]; + const b = parts[1]; + + return ( + a === 10 || + a === 127 || + (a === 172 && b >= 16 && b <= 31) || + (a === 192 && b === 168) || + (a === 169 && b === 254) || + (a === 100 && b >= 64 && b <= 127) + ); +} + +async function copyToClipboard(text, button) { + const oldText = button.textContent; + + function showCopied() { + button.textContent = "Copied"; + button.classList.add("copied"); + + setTimeout(() => { + button.textContent = oldText; + button.classList.remove("copied"); + }, 1200); + } + + function showFailed() { + button.textContent = "Failed"; + + setTimeout(() => { + button.textContent = oldText; + }, 1200); + } + + try { + if (navigator.clipboard && window.isSecureContext) { + await navigator.clipboard.writeText(text); + showCopied(); + return; + } + + const textarea = document.createElement("textarea"); + textarea.value = text; + textarea.setAttribute("readonly", ""); + textarea.style.position = "fixed"; + textarea.style.top = "-9999px"; + textarea.style.left = "-9999px"; + + document.body.appendChild(textarea); + textarea.focus(); + textarea.select(); + + const successful = document.execCommand("copy"); + document.body.removeChild(textarea); + + if (successful) { + showCopied(); + } else { + showFailed(); + } + } catch (err) { + showFailed(); + } +} + +function createAnswersHtml(result) { + if (result.status !== "success") { + return `
${formatDnsError(result.error)}
`; + } + + if (!result.answers || result.answers.length === 0) { + return '
No records found.
'; + } + + return result.answers + .map(answer => { + const value = + typeof answer === "object" ? JSON.stringify(answer) : String(answer); + + const warning = isPrivateIp(value) + ? `
Private / internal IP detected. This domain may be redirected by the local resolver or network.
` + : ""; + + return ` +
+
+
${escapeHtml(value)}
+ +
+ ${warning} +
+ `; + }) + .join(""); +} + +function escapeHtml(value) { + return String(value) + .replaceAll("&", "&") + .replaceAll("<", "<") + .replaceAll(">", ">") + .replaceAll('"', """) + .replaceAll("'", "'"); +} + +function createResultCard(item, query) { + const dcText = item.location.datacenter ? ` — ${item.location.datacenter}` : ""; + const locationText = `${item.location.country} / ${item.location.city}${dcText}`; + const isSuccess = item.result.status === "success"; + + return ` +
+
+
+
${escapeHtml(locationText)}
+
${escapeHtml(query.domain)} · ${escapeHtml(query.type)}
+
${escapeHtml(item.location.sourceLabel || item.location.sourceType || "DNS check")}
+
+
${isSuccess ? "success" : "error"}
+
+ +
+ ${createAnswersHtml(item.result)} +
+ +
+
Response time: ${item.gatewayTimeMs ?? "-"} ms
+
+
+ `; +} + +function renderResults(results, query) { + resultsContainer.innerHTML = ""; + + const ownedResults = results.filter(item => item.location.sourceType === "owned"); + const externalResults = results.filter(item => item.location.sourceType === "external"); + + if (ownedResults.length > 0) { + resultsContainer.insertAdjacentHTML( + "beforeend", + `
Our DNS checks
` + ); + + ownedResults.forEach(item => { + resultsContainer.insertAdjacentHTML("beforeend", createResultCard(item, query)); + }); + } + + if (externalResults.length > 0) { + resultsContainer.insertAdjacentHTML( + "beforeend", + `
External DNS checks
` + ); + + externalResults.forEach(item => { + resultsContainer.insertAdjacentHTML("beforeend", createResultCard(item, query)); + }); + } + + resultsContainer.querySelectorAll(".copy-button").forEach(button => { + button.addEventListener("click", () => { + copyToClipboard(button.dataset.copy, button); + }); + }); +} + +recordTrigger.addEventListener("click", () => { + recordDropdown.classList.toggle("open"); +}); + +recordMenu.querySelectorAll(".select-option").forEach(option => { + option.addEventListener("click", () => { + selectedRecordType = option.dataset.value; + + selectedRecord.textContent = option.dataset.value; + selectedRecordDesc.textContent = option.dataset.desc; + + recordMenu.querySelectorAll(".select-option").forEach(item => { + item.classList.remove("active"); + }); + + option.classList.add("active"); + recordDropdown.classList.remove("open"); + }); +}); + +async function loadUserIp() { + if (!userIpText) return; + + try { + const response = await fetch("/api/client-ip"); + const data = await response.json(); + + userIpText.textContent = `Your IP: ${data.ip || "Unknown"}`; + } catch (err) { + userIpText.textContent = "Your IP: unavailable"; + } +} + +loadUserIp(); + +document.addEventListener("click", event => { + if (!recordDropdown.contains(event.target)) { + recordDropdown.classList.remove("open"); + } +}); + +form.addEventListener("submit", async event => { + event.preventDefault(); + hideError(); + recordDropdown.classList.remove("open"); + + const domain = domainInput.value.trim().toLowerCase(); + const type = selectedRecordType; + + if (!domain) { + showError("Please enter a domain."); + return; + } + + checkButton.disabled = true; + checkButton.textContent = "Checking..."; + + try { + const response = await fetch( + `/api/check?domain=${encodeURIComponent(domain)}&type=${encodeURIComponent(type)}` + ); + + const data = await response.json(); + + if (!response.ok || data.status !== "success") { + showError(data.error || "Request failed."); + return; + } + + renderResults(data.results, data.query); + } catch (err) { + showError(err.message || "Network error."); + } finally { + checkButton.disabled = false; + checkButton.textContent = "Check DNS"; + } +}); diff --git a/public/index.html b/public/index.html new file mode 100644 index 0000000..ea6cca2 --- /dev/null +++ b/public/index.html @@ -0,0 +1,84 @@ + + + + + + NetworkMaster + + + + +
+
+
+
DNS propagation checker
+ +

Check DNS records with confidence

+

+ See how your domain resolves from our own DNS node and trusted external providers. +

+
+ +
+
+ + +
+ + +
+ + + + + + + + + +
+
+ + +
+ +
+
+ Current location: Iran / Tehran +
+ +
+ Your IP: loading... +
+
+ +
+
+ +
+
+
+ + + + diff --git a/public/networkmaster-logo.png b/public/networkmaster-logo.png new file mode 100644 index 0000000..6fc328d Binary files /dev/null and b/public/networkmaster-logo.png differ diff --git a/public/styles.css b/public/styles.css new file mode 100644 index 0000000..a56b05e --- /dev/null +++ b/public/styles.css @@ -0,0 +1,518 @@ +* { + box-sizing: border-box; +} +body { + margin: 0; + font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Arial, sans-serif; + background: + radial-gradient(circle at top left, rgba(79, 70, 229, 0.16), transparent 32%), + linear-gradient(180deg, #eef4ff 0%, #f8fbff 100%); + color: var(--text); +} + +:root { + --bg: #eef4ff; + --card: #ffffff; + --text: #0f172a; + --muted: #64748b; + + --primary: #4f46e5; + --primary-hover: #4338ca; + --primary-soft: #eef2ff; + + --border: #dbe4f0; + --input-bg: #ffffff; + + --success-bg: #dcfce7; + --success-text: #166534; + + --error-bg: #fee2e2; + --error-text: #991b1b; + + --warning-bg: #fff7ed; + --warning-border: #fed7aa; + --warning-text: #9a3412; + + --answer-bg: #f8fafc; +} + +body { + margin: 0; + background: + radial-gradient(circle at top left, rgba(79, 70, 229, 0.16), transparent 32%), + linear-gradient(180deg, #eef4ff 0%, #f8fbff 100%); + color: var(--text); +} + +.page { + min-height: 100vh; + padding: 40px 20px; +} + +.container { + max-width: 980px; + margin: 0 auto; +} + +.hero { + text-align: center; + margin-bottom: 32px; +} + +.badge { + display: inline-block; + background: var(--primary-soft); + color: var(--primary); + padding: 8px 14px; + border-radius: 999px; + font-size: 14px; + font-weight: 700; + margin-bottom: 16px; + border: 1px solid rgba(79, 70, 229, 0.14); +} + +h1 { + font-size: 42px; + margin: 0 0 12px; + letter-spacing: -0.035em; + font-weight: 800; + line-height: 1.1; +} + +.subtitle { + color: var(--muted); + font-size: 17px; + margin: 0; + font-weight: 500; + line-height: 1.7; +} + +.card { + background: rgba(255, 255, 255, 0.92); + border: 1px solid rgba(219, 228, 240, 0.85); + border-radius: 24px; + box-shadow: 0 20px 55px rgba(15, 23, 42, 0.08); + padding: 24px; + margin-bottom: 24px; + backdrop-filter: blur(10px); +} + +.search-card { + position: relative; + z-index: 100; +} + +.form { + display: grid; + grid-template-columns: 1fr 220px 150px; + gap: 12px; + align-items: start; +} + +input { + height: 52px; + border-radius: 14px; + border: 1px solid var(--border); + background: var(--input-bg); + font-size: 16px; + padding: 0 16px; + outline: none; + width: 100%; + color: var(--text); +} + +input::placeholder { + color: #94a3b8; +} + +input:focus { + border-color: var(--primary); + box-shadow: 0 0 0 4px rgba(79, 70, 229, 0.12); +} + +button { + font-family: Arial, sans-serif; +} + +#checkButton { + height: 52px; + border-radius: 14px; + border: none; + background: linear-gradient(135deg, var(--primary), #2563eb); + color: white; + cursor: pointer; + font-weight: 700; + font-size: 16px; + padding: 0 16px; + width: 100%; + box-shadow: 0 12px 24px rgba(79, 70, 229, 0.25); +} + +#checkButton:hover { + background: linear-gradient(135deg, var(--primary-hover), #1d4ed8); +} + +#checkButton:disabled { + opacity: 0.6; + cursor: not-allowed; +} + +.custom-select { + position: relative; + height: 52px; + z-index: 50; +} + +.select-trigger { + width: 100%; + height: 52px; + background: var(--input-bg); + color: var(--text); + border: 1px solid var(--border); + border-radius: 14px; + padding: 0 14px; + cursor: pointer; + display: flex; + align-items: center; + justify-content: flex-start; + text-align: left; +} + +.select-trigger:hover { + background: #f8faff; + border-color: #b9c7f8; +} + +.select-trigger span:first-child { + display: flex; + flex-direction: column; + gap: 3px; +} + +.select-trigger strong { + font-size: 15px; + line-height: 1.1; + color: var(--text); +} + +.select-trigger small { + font-size: 12px; + line-height: 1.2; + color: var(--muted); +} + +.select-menu { + display: none; + position: absolute; + top: 60px; + left: 0; + right: 0; + z-index: 999; + background: #ffffff; + border: 1px solid var(--border); + border-radius: 16px; + padding: 8px; + box-shadow: 0 18px 45px rgba(15, 23, 42, 0.16); +} + +.custom-select.open .select-menu { + display: grid; + gap: 6px; +} + +.select-option { + width: 100%; + min-height: 54px; + height: auto; + background: transparent; + color: var(--text); + border: none; + border-radius: 12px; + padding: 10px 12px; + display: flex; + flex-direction: column; + align-items: flex-start; + justify-content: center; + gap: 3px; + cursor: pointer; + text-align: left; + font-weight: 400; +} + +.select-option:hover { + background: #f4f7ff; +} + +.select-option.active { + background: var(--primary-soft); +} + +.select-option strong { + font-size: 15px; + color: var(--text); +} + +.select-option small { + font-size: 12px; + color: var(--muted); +} + +.select-option.active strong, +.select-option.active small { + color: var(--primary); +} + +.meta { + margin-top: 16px; + color: var(--muted); + font-size: 14px; +} + +.result-card { + display: none; + position: relative; + z-index: 1; +} + +.result-header { + display: flex; + justify-content: space-between; + align-items: center; + gap: 12px; + margin-bottom: 18px; +} + +.location { + font-size: 18px; + font-weight: 700; +} + +.status { + padding: 7px 12px; + border-radius: 999px; + font-size: 14px; + font-weight: 700; +} + +.status.success { + background: var(--success-bg); + color: var(--success-text); +} + +.status.error { + background: var(--error-bg); + color: var(--error-text); +} + +.answers { + display: grid; + gap: 10px; +} + +.answer { + background: var(--answer-bg); + border: 1px solid var(--border); + border-radius: 14px; + padding: 14px 16px; + word-break: break-word; +} + +.answer-main { + display: flex; + align-items: center; + justify-content: space-between; + gap: 12px; +} + +.answer-value { + font-family: Consolas, monospace; + word-break: break-word; +} + +.copy-button { + border: 1px solid var(--border); + background: #ffffff; + color: var(--primary); + border-radius: 10px; + padding: 7px 10px; + cursor: pointer; + font-size: 13px; + font-weight: 700; + flex-shrink: 0; +} + +.copy-button:hover { + background: var(--primary-soft); +} + +.copy-button.copied { + background: var(--success-bg); + color: var(--success-text); + border-color: var(--success-bg); +} + +.answer-warning { + margin-top: 8px; + background: var(--warning-bg); + border: 1px solid var(--warning-border); + color: var(--warning-text); + border-radius: 12px; + padding: 10px 12px; + font-size: 13px; + line-height: 1.5; +} + +.empty { + color: var(--muted); + background: var(--answer-bg); + border-radius: 14px; + padding: 16px; +} + +.stats { + display: flex; + flex-wrap: wrap; + gap: 10px; + margin-top: 18px; +} + +.stat { + background: #f1f5f9; + border-radius: 12px; + padding: 10px 12px; + color: #334155; + font-size: 14px; +} + +.error-box { + display: none; + background: var(--error-bg); + color: var(--error-text); + border: 1px solid #fecaca; + border-radius: 16px; + padding: 14px 16px; + margin-top: 16px; +} + +@media (max-width: 720px) { + h1 { + font-size: 32px; + } + + .form { + grid-template-columns: 1fr; + } + + .result-header { + align-items: flex-start; + flex-direction: column; + } + + .answer-main { + align-items: flex-start; + flex-direction: column; + } + + .copy-button { + width: 100%; + } +} +.results-container { + display: grid; + gap: 18px; +} + +.result-group-title { + color: var(--muted); + font-size: 14px; + font-weight: 700; + margin: 8px 0 -6px; +} + +.dns-result-card { + position: relative; + z-index: 1; +} + +.source-badge { + display: inline-block; + margin-top: 8px; + padding: 5px 9px; + border-radius: 999px; + background: var(--primary-soft); + color: var(--primary); + font-size: 12px; + font-weight: 700; +} +.search-card { + position: relative; + z-index: 1000; +} + +.results-container { + display: grid; + gap: 18px; + margin-top: 24px; + position: relative; + z-index: 1; +} + +.custom-select { + position: relative; + z-index: 2000; +} + +.select-menu { + z-index: 3000; +} + +.result-group-title { + color: var(--muted); + font-size: 14px; + font-weight: 700; + margin: 8px 0 -6px; +} + +.dns-result-card { + position: relative; + z-index: 1; +} + +.source-badge { + display: inline-block; + margin-top: 8px; + padding: 5px 9px; + border-radius: 999px; + background: var(--primary-soft); + color: var(--primary); + font-size: 12px; + font-weight: 700; +} +.info-row { + display: flex; + align-items: center; + justify-content: space-between; + gap: 12px; + margin-top: 16px; +} + +.info-row .meta { + margin-top: 0; +} + +.user-ip { + direction: ltr; + text-align: right; + font-family: Consolas, monospace; +} + +@media (max-width: 720px) { + .info-row { + align-items: flex-start; + flex-direction: column; } + + .user-ip { + text-align: left; + } +} + diff --git a/server.js b/server.js new file mode 100644 index 0000000..70b5366 --- /dev/null +++ b/server.js @@ -0,0 +1,326 @@ + const express = require("express"); +const cors = require("cors"); + +const helmet = require("helmet"); +const rateLimit = require("express-rate-limit"); + +const app = express(); +const PORT = 4000; + +app.disable("x-powered-by"); + +app.use(helmet({ + contentSecurityPolicy: { + directives: { + defaultSrc: ["'self'"], + scriptSrc: ["'self'"], + styleSrc: ["'self'"], + imgSrc: ["'self'", "data:"], + connectSrc: ["'self'"], + objectSrc: ["'none'"], + baseUri: ["'self'"], + frameAncestors: ["'none'"] + } + } +})); + +app.use(cors()); +app.use(express.json({ limit: "10kb" })); +app.use(express.static("public")); +app.use(express.static("public")); +app.set("trust proxy", true); + + + +const apiLimiter = rateLimit({ + windowMs: 60 * 1000, + max: 60, + standardHeaders: true, + legacyHeaders: false, + message: { + status: "error", + error: "Too many requests. Please try again later." + } +}); + +app.use("/api/check", apiLimiter); + + + +const agents = [ + { + id: "iran-tehran-parsvds", + sourceType: "owned", + sourceLabel: "Our server", + priority: 1, + country: "Iran", + city: "Tehran", + datacenter: "Parsvds", + flag: "IR", + url: "http://127.0.0.1:3000" + } +]; + +const externalProviders = [ + { + id: "google-public-dns", + sourceType: "external", + sourceLabel: "External check", + priority: 100, + country: "Global", + city: "Google Public DNS", + datacenter: "Google", + flag: "GOOGLE", + provider: "google-doh" + } +]; + +const ALLOWED_TYPES = ["A", "AAAA", "NS", "CNAME", "MX"]; + +function isValidDomain(domain) { + if (!domain || typeof domain !== "string") return false; + if (domain.length > 253) return false; + if (domain.includes("..")) return false; + if (domain.startsWith(".") || domain.endsWith(".")) return false; + + return /^(?!-)([a-zA-Z0-9-]{1,63}\.)+[a-zA-Z]{2,63}$/.test(domain); +} + +function buildLocation(provider) { + return { + id: provider.id, + sourceType: provider.sourceType, + sourceLabel: provider.sourceLabel, + priority: provider.priority, + country: provider.country, + city: provider.city, + datacenter: provider.datacenter, + flag: provider.flag + }; +} + +function dnsTypeToGoogleType(type) { + const map = { + A: 1, + NS: 2, + CNAME: 5, + MX: 15, + AAAA: 28 + }; + + return map[type] || type; +} + +function googleStatusToError(status) { + const map = { + 1: "DNS query format error.", + 2: "Destination DNS server did not respond with a valid answer.", + 3: "Domain was not found.", + 4: "DNS request type is not supported.", + 5: "DNS request was refused." + }; + + return map[status] || `DNS error status ${status}`; +} + +function parseGoogleAnswers(data, type) { + if (!data.Answer || !Array.isArray(data.Answer)) { + return []; + } + + const typeMap = { + A: 1, + NS: 2, + CNAME: 5, + MX: 15, + AAAA: 28 + }; + + const wantedType = typeMap[type]; + + return data.Answer + .filter(answer => answer.type === wantedType) + .map(answer => { + if (type === "MX") { + const parts = String(answer.data).trim().split(/\s+/); + return { + priority: Number(parts[0]), + exchange: parts.slice(1).join(" ").replace(/\.$/, "") + }; + } + + return String(answer.data).replace(/\.$/, ""); + }); +} + +async function fetchJsonWithTimeout(url, timeoutMs = 4000) { + const controller = new AbortController(); + const timeout = setTimeout(() => controller.abort(), timeoutMs); + + try { + const response = await fetch(url, { + signal: controller.signal, + headers: { + accept: "application/json" + } + }); + + return await response.json(); + } finally { + clearTimeout(timeout); + } +} + +async function queryOwnedAgent(agent, domain, type) { + const startTime = Date.now(); + + try { + const url = + `${agent.url}/resolve?domain=${encodeURIComponent(domain)}&type=${encodeURIComponent(type)}`; + + const data = await fetchJsonWithTimeout(url, 8000); + + return { + location: buildLocation(agent), + query: { + domain, + type + }, + result: data.result, + gatewayTimeMs: Date.now() - startTime + }; + } catch (err) { + return { + location: buildLocation(agent), + query: { + domain, + type + }, + result: { + status: "error", + error: err.name === "AbortError" ? "Agent request timed out." : "Agent request failed.", + answers: [], + responseTimeMs: null + }, + gatewayTimeMs: Date.now() - startTime + }; + } +} + +async function queryGoogleDns(provider, domain, type) { + const startTime = Date.now(); + + try { + const googleType = dnsTypeToGoogleType(type); + const url = + `https://dns.google/resolve?name=${encodeURIComponent(domain)}&type=${encodeURIComponent(googleType)}`; + + const data = await fetchJsonWithTimeout(url, 5000); + + const answers = parseGoogleAnswers(data, type); + const success = data.Status === 0 && answers.length > 0; + + return { + location: buildLocation(provider), + query: { + domain, + type + }, + result: { + status: success ? "success" : "error", + error: success ? null : googleStatusToError(data.Status), + answers, + responseTimeMs: Date.now() - startTime + }, + gatewayTimeMs: Date.now() - startTime + }; + } catch (err) { + return { + location: buildLocation(provider), + query: { + domain, + type + }, + result: { + status: "error", + error: err.name === "AbortError" ? "External DNS request timed out." : "External DNS request failed.", + answers: [], + responseTimeMs: null + }, + gatewayTimeMs: Date.now() - startTime + }; + } +} + +app.get("/api/client-ip", (req, res) => { + const ip = + req.headers["x-forwarded-for"]?.split(",")[0]?.trim() || + req.ip || + req.socket.remoteAddress || + "Unknown"; + + res.json({ + ip + }); +}); + + +app.get("/api/locations", (req, res) => { + res.json({ + locations: [...agents, ...externalProviders].map(provider => buildLocation(provider)) + }); +}); + +app.get("/api/check", async (req, res) => { + const domain = String(req.query.domain || "").trim().toLowerCase(); + const type = String(req.query.type || "A").toUpperCase(); + + if (!domain) { + return res.status(400).json({ + status: "error", + error: "domain is required" + }); + } + + if (!isValidDomain(domain)) { + return res.status(400).json({ + status: "error", + error: "invalid domain" + }); + } + + if (!ALLOWED_TYPES.includes(type)) { + return res.status(400).json({ + status: "error", + error: "unsupported record type", + allowedTypes: ALLOWED_TYPES + }); + } + + const ownedResults = await Promise.all( + agents.map(agent => queryOwnedAgent(agent, domain, type)) + ); + + const externalResults = await Promise.all( + externalProviders.map(provider => queryGoogleDns(provider, domain, type)) + ); + + const results = [...ownedResults, ...externalResults]; + + results.sort((a, b) => { + return (a.location.priority || 999) - (b.location.priority || 999); + }); + + res.json({ + status: "success", + query: { + domain, + type + }, + results + }); +}); + +app.listen(PORT, "127.0.0.1", () => { + console.log(`DNS Checker backend running on port ${PORT}`); +});