Refactor: use UDP DNS to get Telegram backup IP [skip ci]

Build/lib/get-telegram-backup-ip.ts

@@ -131,10 +131,13 @@ const pool = new Worktank({
 
         const picocolors = __require('picocolors') as typeof import('picocolors');
         const { fetch } = __require('./fetch-retry') as typeof import('./fetch-retry');
-        const DNS2 = __require('dns2') as typeof import('dns2');
+
+        const dns = __require('node:dns/promises') as typeof import('node:dns/promises');
+
         const { createReadlineInterfaceFromResponse } = __require('./fetch-text-by-line') as typeof import('./fetch-text-by-line');
         const { getTelegramBackupIPFromBase64 } = __require('./get-telegram-backup-ip') as typeof import('./get-telegram-backup-ip');
         const { fastIpVersion } = __require('foxts/fast-ip-version') as typeof import('foxts/fast-ip-version');
+        const { fastStringArrayJoin } = __require('foxts/fast-string-array-join') as typeof import('foxts/fast-string-array-join');
 
         const resp = await fetch('https://core.telegram.org/resources/cidr.txt');
         const lastModified = resp.headers.get('last-modified');
@@ -159,33 +162,37 @@ const pool = new Worktank({
 
         // https://github.com/tdlib/td/blob/master/td/telegram/ConfigManager.cpp
 
-        // Backup IP Source 1 (DoH)
+        const resolvers = ['8.8.8.8', '1.0.0.1'].map((ip) => {
-        await Promise.all([
+          const resolver = new dns.Resolver();
-          DNS2.DOHClient({ dns: 'https://8.8.4.4/dns-query?dns={query}' }),
+          resolver.setServers([ip]);
-          DNS2.DOHClient({ dns: 'https://1.0.0.1/dns-query?dns={query}' })
+          return Object.assign(resolver, { server: ip });
-        ].flatMap(
+        });
-          (client) => [
+
+        // Backup IP Source 1 (DNS)
+        await Promise.all(resolvers.flatMap((resolver) => [
           'apv3.stel.com', // prod
           'tapv3.stel.com' // test
         ].map(async (domain) => {
           try {
             // tapv3.stel.com was for testing server
-              const resp = await client(domain, 'TXT');
+            const resp = await resolver.resolveTxt(domain);
-              const strings = resp.answers.map(i => i.data);
+            const strings = resp.map(r => fastStringArrayJoin(r, '')); // flatten
+            if (strings.length !== 2) {
+              throw new TypeError(`Unexpected TXT record count: ${strings.length}`);
+            }
 
-              const str = strings[0]!.length > strings[1]!.length
+            const str = strings[0].length > strings[1].length
-                ? strings[0]! + strings[1]!
+              ? strings[0] + strings[1]
-                : strings[1]! + strings[0]!;
+              : strings[1] + strings[0];
 
             const ips = getTelegramBackupIPFromBase64(str);
             ips.forEach(i => backupIPs.add(i.ip));
 
-              console.log('[telegram backup ip]', picocolors.green('DoH TXT'), { domain, ips });
+            console.log('[telegram backup ip]', picocolors.green('DNS TXT'), { domain, ips, server: resolver.server });
           } catch (e) {
-              console.error('[telegram backup ip]', picocolors.red('DoH TXT error'), { domain }, e);
+            console.error('[telegram backup ip]', picocolors.red('DNS TXT error'), { domain }, e);
           }
-          })
+        })));
-        ));
 
         // Backup IP Source 2: Firebase Realtime Database (test server not supported)
         try {

package.json

@@ -26,7 +26,6 @@
     "ci-info": "^4.3.1",
     "cli-progress": "^3.12.0",
     "csv-parse": "^6.1.0",
-    "dns2": "github:lsongdev/node-dns#e4fa035aca0b8eb730bde3431fbf0c60a31a09c9",
     "domain-alive": "^0.1.14",
     "fast-cidr-tools": "^0.3.4",
     "fast-escape-regexp": "^1.0.1",
@@ -56,7 +55,6 @@
     "@swc/core": "1.13.5",
     "@types/better-sqlite3": "^7.6.13",
     "@types/cli-progress": "^3.11.6",
-    "@types/dns2": "^2.0.10",
     "@types/mocha": "^10.0.10",
     "@types/node": "^24.10.4",
     "@types/tar-fs": "^2.0.4",

pnpm-lock.yaml

@@ -35,9 +35,6 @@ importers:
       csv-parse:
         specifier: ^6.1.0
         version: 6.1.0
-      dns2:
-        specifier: github:lsongdev/node-dns#e4fa035aca0b8eb730bde3431fbf0c60a31a09c9
-        version: https://codeload.github.com/lsongdev/node-dns/tar.gz/e4fa035aca0b8eb730bde3431fbf0c60a31a09c9
       domain-alive:
         specifier: ^0.1.14
         version: 0.1.14
@@ -120,9 +117,6 @@ importers:
       '@types/cli-progress':
         specifier: ^3.11.6
         version: 3.11.6
-      '@types/dns2':
-        specifier: ^2.0.10
-        version: 2.0.10
       '@types/mocha':
         specifier: ^10.0.10
         version: 10.0.10
@@ -667,9 +661,6 @@ packages:
   '@types/cli-progress@3.11.6':
     resolution: {integrity: sha512-cE3+jb9WRlu+uOSAugewNpITJDt1VF8dHOopPO4IABFc3SXYL5WE/+PTz/FCdZRRfIujiWW3n3aMbv1eIGVRWA==}
 
-  '@types/dns2@2.0.10':
-    resolution: {integrity: sha512-3ezTiJfY6/VlXnvEOVSSbWpFbxtS3zXi0f2mccV6tI7wT+BIvTgLZhEUVHpiE1ycLKMqJyXndmkKw42nX49MQA==}
-
   '@types/estree@1.0.8':
     resolution: {integrity: sha512-dWHzHa2WqEXI/O1E9OjrocMTKJl2mSrEolh1Iomrv6U+JuNwaHXsXx9bLu5gG7BUWFIN0skIQJQ/L1rIex4X6w==}
 
@@ -1117,10 +1108,6 @@ packages:
     resolution: {integrity: sha512-PJWHUb1RFevKCwaFA9RlG5tCd+FO5iRh9A8HEtkmBH2Li03iJriB6m6JIN4rGz3K3JLawI7/veA1xzRKP6ISBw==}
     engines: {node: '>=0.3.1'}
 
-  dns2@https://codeload.github.com/lsongdev/node-dns/tar.gz/e4fa035aca0b8eb730bde3431fbf0c60a31a09c9:
-    resolution: {tarball: https://codeload.github.com/lsongdev/node-dns/tar.gz/e4fa035aca0b8eb730bde3431fbf0c60a31a09c9}
-    version: 2.1.0
-
   dom-serializer@1.4.1:
     resolution: {integrity: sha512-VHwB3KfrcOOkelEG2ZOfxqLZdfkil8PtJi4P8N2MMXucZq2yLp75ClViUlOVwyoHEDjYU433Aq+5zWP61+RGag==}
 
@@ -2653,10 +2640,6 @@ snapshots:
     dependencies:
       '@types/node': 24.10.4
 
-  '@types/dns2@2.0.10':
-    dependencies:
-      '@types/node': 24.10.4
-
   '@types/estree@1.0.8': {}
 
   '@types/istanbul-lib-coverage@2.0.6': {}
@@ -3062,8 +3045,6 @@ snapshots:
 
   diff@7.0.0: {}
 
-  dns2@https://codeload.github.com/lsongdev/node-dns/tar.gz/e4fa035aca0b8eb730bde3431fbf0c60a31a09c9: {}
-
   dom-serializer@1.4.1:
     dependencies:
       domelementtype: 2.3.0