Raven Scott
80485468f0
Retry listen(0)/bind(0) when the preferred port is taken, gated by BARE_OS_BIND_FALLBACK (default on; set 0/false for strict bind). - Add lib/bare-os-bind-fallback.js and use it from bare-os-www-initd and bare-openssh (including privilege-path + holesail actual port). - POSIX socket bridge in index.js: TCP listen and UDP bind fallbacks. - bare-holesail + bare-holesail-managed: retry Holesail ready(); persist resolved listen port in managed state when it changes. - Add test.bare-os-bind-fallback.js.
67 lines
1.9 KiB
JavaScript
67 lines
1.9 KiB
JavaScript
import test from 'brittle'
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import net from 'node:net'
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import {
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bindFallbackEnabled,
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isAddrInUse,
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listenTcpWithFallback,
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readListeningTcpPort,
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BARE_OS_BIND_FALLBACK_ENV
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} from './lib/bare-os-bind-fallback.js'
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test('bindFallbackEnabled', (t) => {
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t.ok(bindFallbackEnabled({}))
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t.ok(bindFallbackEnabled({ [BARE_OS_BIND_FALLBACK_ENV]: '1' }))
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t.absent(bindFallbackEnabled({ [BARE_OS_BIND_FALLBACK_ENV]: '0' }))
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t.absent(bindFallbackEnabled({ [BARE_OS_BIND_FALLBACK_ENV]: 'false' }))
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})
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test('isAddrInUse', (t) => {
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t.ok(isAddrInUse(Object.assign(new Error('x'), { code: 'EADDRINUSE' })))
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t.absent(isAddrInUse(Object.assign(new Error('x'), { code: 'ENOENT' })))
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t.ok(isAddrInUse(new Error('listen EADDRINUSE: address already in use')))
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})
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test('listenTcpWithFallback picks ephemeral when preferred port busy', async (t) => {
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const hog = net.createServer()
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await new Promise((resolve, reject) => {
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hog.once('error', reject)
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hog.listen(0, '127.0.0.1', resolve)
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})
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const hogPort = readListeningTcpPort(hog, 0)
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t.ok(Number.isFinite(hogPort) && hogPort > 0)
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const srv = net.createServer()
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const { port } = await listenTcpWithFallback(
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srv,
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hogPort,
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'127.0.0.1',
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{}
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)
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t.not(port, hogPort)
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t.ok(port > 0)
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await new Promise((resolve) => srv.close(resolve))
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await new Promise((resolve) => hog.close(resolve))
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})
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test('listenTcpWithFallback strict env rethrows EADDRINUSE', async (t) => {
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const hog = net.createServer()
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await new Promise((resolve, reject) => {
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hog.once('error', reject)
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hog.listen(0, '127.0.0.1', resolve)
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})
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const hogPort = readListeningTcpPort(hog, 0)
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const srv = net.createServer()
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try {
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await listenTcpWithFallback(srv, hogPort, '127.0.0.1', {
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[BARE_OS_BIND_FALLBACK_ENV]: '0'
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})
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t.fail('expected EADDRINUSE')
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} catch (e) {
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t.ok(isAddrInUse(e))
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}
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await new Promise((resolve) => hog.close(resolve))
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})
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