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Use custom fallback DNS servers

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Fedor Indutny 2023-03-22 13:56:49 -07:00 • committed by GitHub
parent 56145fabcc
commit 2f691f3dd0
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1 changed files with 12 additions and 1 deletions
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13
ts/util/dns.ts
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@ -1,13 +1,22 @@
// Copyright 2023 Signal Messenger, LLC // Copyright 2023 Signal Messenger, LLC
// SPDX-License-Identifier: AGPL-3.0-only // SPDX-License-Identifier: AGPL-3.0-only
import { lookup as nativeLookup, resolve4, resolve6 } from 'dns'; import {
lookup as nativeLookup,
resolve4,
resolve6,
getServers,
setServers,
} from 'dns';
import type { LookupOneOptions } from 'dns'; import type { LookupOneOptions } from 'dns';
import * as log from '../logging/log'; import * as log from '../logging/log';
import * as Errors from '../types/errors'; import * as Errors from '../types/errors';
import { strictAssert } from './assert'; import { strictAssert } from './assert';
const ORIGINAL_SERVERS = getServers();
const FALLBACK_SERVERS = ['1.1.1.1'];
export function lookupWithFallback( export function lookupWithFallback(
hostname: string, hostname: string,
opts: LookupOneOptions, opts: LookupOneOptions,
@ -37,6 +46,7 @@ export function lookupWithFallback(
fallbackErr: NodeJS.ErrnoException | null, fallbackErr: NodeJS.ErrnoException | null,
records: Array<string> records: Array<string>
): void => { ): void => {
setServers(ORIGINAL_SERVERS);
if (fallbackErr) { if (fallbackErr) {
return callback(fallbackErr, '', 0); return callback(fallbackErr, '', 0);
} }
@ -53,6 +63,7 @@ export function lookupWithFallback(
callback(null, records[index], family); callback(null, records[index], family);
}; };
setServers(FALLBACK_SERVERS);
if (family === 4) { if (family === 4) {
resolve4(hostname, onRecords); resolve4(hostname, onRecords);
} else { } else {