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build: use resolve4/resolve6 in build:dns-fallback.

Browse source 
`dns.lookup` relies on making syscalls to the underlying
system using `getaddrinfo`, which can sometimes fail in
proxy situations.

This is an equivalent implementation using the native
NodeJS DNS functions.
This commit is contained in:
Jon Seager 2024-08-01 17:00:36 +01:00
parent 02e7a9e1a5
commit cb5e7a029b
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1 changed files with 27 additions and 31 deletions
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58
ts/scripts/generate-dns-fallback.ts
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@ -1,15 +1,15 @@
// Copyright 2024 Signal Messenger, LLC
// SPDX-License-Identifier: AGPL-3.0-only
import { join } from 'path';
import { lookup as lookupCb } from 'dns';
import { resolve4 as resolve4Cb, resolve6 as resolve6Cb } from 'dns';
import { writeFile } from 'fs/promises';
import { join } from 'path';
import { promisify } from 'util';
import type { ResolvedEndpoint } from 'electron';
import { isNotNil } from '../util/isNotNil';
const lookup = promisify(lookupCb);
const resolve4 = promisify(resolve4Cb);
const resolve6 = promisify(resolve6Cb);
const FALLBACK_DOMAINS = [
'chat.signal.org',
@ -25,35 +25,31 @@ const FALLBACK_DOMAINS = [
async function main() {
const config = await Promise.all(
FALLBACK_DOMAINS.sort().map(async domain => {
const addresses = await lookup(domain, { all: true });
const endpoints = addresses
.map(({ address, family }): ResolvedEndpoint | null => {
if (family === 4) {
return { family: 'ipv4', address };
}
if (family === 6) {
return { family: 'ipv6', address };
}
return null;
})
.filter(isNotNil)
.sort((a, b) => {
if (a.family < b.family) {
return -1;
}
if (a.family > b.family) {
return 1;
}
const ipv4endpoints = (await resolve4(domain))
.map(a => ({"family": "ipv4", "address": a}))
if (a.address < b.address) {
return -1;
}
if (a.address > b.address) {
return 1;
}
return 0;
});
const ipv6endpoints = (await resolve6(domain))
.map(a => ({"family": "ipv6", "address": a}))
const endpoints = [...ipv4endpoints, ...ipv6endpoints]
.filter(isNotNil)
.sort((a, b) => {
if (a.family < b.family) {
return -1;
}
if (a.family > b.family) {
return 1;
}
if (a.address < b.address) {
return -1;
}
if (a.address > b.address) {
return 1;
}
return 0;
})
return { domain, endpoints };
})