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test: retry OPC UA host start on a port bind race (TOCTOU in AllocateFreePort)

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The tests probe a free port (bind 0, release) and start the SDK server later; under a
highly parallel run another test can take the port in between and the SDK fails with
'Failed to establish tcp listener sockets for Ipv4 and IPv6.'. OpcUaHostStart.StartAsync
builds a fresh host + server on a fresh port per attempt (up to 5) when the failure is a
bind failure; all 45 start sites in OpcUaServer.Tests, OpcUaServer.IntegrationTests and
Runtime.Tests use it. Per-attempt GUID ApplicationUris are hoisted out of the host factory
because a changed URI against a reused PKI store fails with 'Cannot access private key'.

Claude-Session: https://claude.ai/code/session_01Ef2ozxS7QPanGT8uoATbTe
This commit is contained in:
Joseph Doherty
2026-10-08 22:30:55 -04:00
parent d83e8f21aa
commit f02067d295
41 changed files with 948 additions and 1078 deletions
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tests/Server/ZB.MOM.WW.OtOpcUa.OpcUaServer.Tests/OpcUaApplicationHostServerArrayTests.cs
+15 -22
View File
@@ -26,19 +26,21 @@ public sealed class OpcUaApplicationHostServerArrayTests
var pkiRoot = Path.Combine(Path.GetTempPath(), $"otopcua-pki-{Guid.NewGuid():N}");
try
{
var options = new OpcUaApplicationHostOptions
{
ApplicationName = "OtOpcUa.UnitTest",
ApplicationUri = "urn:OtOpcUa.UnitTest.NodeA",
OpcUaPort = AllocateFreePort(),
PublicHostname = "127.0.0.1",
PkiStoreRoot = pkiRoot,
PeerApplicationUris = new[] { "urn:OtOpcUa.UnitTest.NodeB" },
};
var server = new StandardServer();
await using var host = new OpcUaApplicationHost(options, NullLogger<OpcUaApplicationHost>.Instance);
await host.StartAsync(server, CancellationToken.None);
var started = await OpcUaHostStart.StartAsync(
port => new OpcUaApplicationHost(
new OpcUaApplicationHostOptions
{
ApplicationName = "OtOpcUa.UnitTest",
ApplicationUri = "urn:OtOpcUa.UnitTest.NodeA",
OpcUaPort = port,
PublicHostname = "127.0.0.1",
PkiStoreRoot = pkiRoot,
PeerApplicationUris = new[] { "urn:OtOpcUa.UnitTest.NodeB" },
},
NullLogger<OpcUaApplicationHost>.Instance),
() => new StandardServer(), CancellationToken.None);
await using var host = started.Host;
var server = started.Server;
var serverArray = server.CurrentInstance.ServerObject.ServerArray.Value;
serverArray.ShouldNotBeNull();
@@ -50,13 +52,4 @@ public sealed class OpcUaApplicationHostServerArrayTests
if (Directory.Exists(pkiRoot)) Directory.Delete(pkiRoot, recursive: true);
}
}
private static int AllocateFreePort()
{
var listener = new TcpListener(IPAddress.Loopback, 0);
listener.Start();
var port = ((IPEndPoint)listener.LocalEndpoint).Port;
listener.Stop();
return port;
}
}