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fix: make tunnel start despite unreadable DNS answers

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wstunnel's built-in DNS resolver fails on some DNS servers because it
cannot read their EDNS answers. With a connection pool the client then
never opened the local port. Use the Windows resolver instead.

The port check also took ~2 s per attempt, so the start script showed
an empty window for a long time before the error appeared.
This commit is contained in:
Andre
2026-10-23 09:37:41 +02:00
parent 9c278f49b6
commit 77689a9aec
1 changed files with 7 additions and 2 deletions
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client/scripts/common.ps1
+7 -2
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@@ -14,7 +14,11 @@ $LogDir = Join-Path $ClientDir 'logs'
$ProxyUrl = "http://$LocalProxy"
function Get-TunnelArgs([string]$LogLevel) {
$tunnelArgs = @('client', '-L', "http://$LocalProxy", '-c', '2', '--log-lvl', $LogLevel)
# Windows-Resolver statt des eingebauten: Manche DNS-Server liefern EDNS-Antworten,
# die wstunnel nicht lesen kann. Dann scheitert jede Verbindung, und mit -c wartet
# der Client endlos auf den Pool, bevor er den lokalen Port oeffnet.
$tunnelArgs = @('client', '-L', "http://$LocalProxy", '-c', '2', '--log-lvl', $LogLevel,
'--dns-resolver', 'system://0.0.0.0')
if (-not $SkipTlsVerify) { $tunnelArgs += '--tls-verify-certificate' }
if ($UpstreamProxy) { $tunnelArgs += @('--http-proxy', $UpstreamProxy) }
if ($UpstreamProxyUser) { $tunnelArgs += @('--http-proxy-login', $UpstreamProxyUser) }
@@ -44,7 +48,8 @@ function Invoke-WithTunnelEnv([scriptblock]$Action) {
function Test-TunnelListening {
$parts = $LocalProxy.Split(':')
$client = New-Object System.Net.Sockets.TcpClient
try { $client.Connect($parts[0], [int]$parts[1]); return $true }
# Connect() auf einen geschlossenen Port dauert unter Windows ~2 s (SYN-Wiederholungen)
try { return $client.ConnectAsync($parts[0], [int]$parts[1]).Wait(500) -and $client.Connected }
catch { return $false }
finally { $client.Close() }
}