Update ITlsHandshakeFeature.HostName API + misc. improvements in HttpSys calls

src/Servers/Connections.Abstractions/src/Features/ITlsHandshakeFeature.cs

@@ -29,7 +29,7 @@ public interface ITlsHandshakeFeature
     /// Gets the host name from the "server_name" (SNI) extension of the client hello if present.
     /// See <see href="https://www.rfc-editor.org/rfc/rfc6066#section-3">RFC 6066</see>.
     /// </summary>
-    string? HostName => null;
+    string HostName => string.Empty;
 #endif
 
     /// <summary>

src/Servers/Connections.Abstractions/src/PublicAPI/net8.0/PublicAPI.Unshipped.txt

@@ -6,7 +6,7 @@ Microsoft.AspNetCore.Connections.Features.IConnectionMetricsTagsFeature
 Microsoft.AspNetCore.Connections.Features.IConnectionMetricsTagsFeature.Tags.get -> System.Collections.Generic.ICollection<System.Collections.Generic.KeyValuePair<string!, object?>>!
 Microsoft.AspNetCore.Connections.Features.IConnectionNamedPipeFeature
 Microsoft.AspNetCore.Connections.Features.IConnectionNamedPipeFeature.NamedPipe.get -> System.IO.Pipes.NamedPipeServerStream!
-Microsoft.AspNetCore.Connections.Features.ITlsHandshakeFeature.HostName.get -> string?
+Microsoft.AspNetCore.Connections.Features.ITlsHandshakeFeature.HostName.get -> string!
 Microsoft.AspNetCore.Connections.Features.ITlsHandshakeFeature.NegotiatedCipherSuite.get -> System.Net.Security.TlsCipherSuite?
 Microsoft.AspNetCore.Connections.IConnectionListenerFactorySelector
 Microsoft.AspNetCore.Connections.IConnectionListenerFactorySelector.CanBind(System.Net.EndPoint! endpoint) -> bool

src/Servers/HttpSys/src/NativeInterop/HttpApi.cs

@@ -79,11 +79,10 @@ internal static unsafe partial uint HttpCreateRequestQueue(HTTPAPI_VERSION versi
 
     [LibraryImport(HTTPAPI, SetLastError = true)]
     internal static unsafe partial uint HttpDelegateRequestEx(SafeHandle pReqQueueHandle, SafeHandle pDelegateQueueHandle, ulong requestId,
-        ulong delegateUrlGroupId, ulong propertyInfoSetSize, HTTP_DELEGATE_REQUEST_PROPERTY_INFO* pRequestPropertyBuffer);
+        ulong delegateUrlGroupId, uint propertyInfoSetSize, HTTP_DELEGATE_REQUEST_PROPERTY_INFO* pRequestPropertyBuffer);
 
-    [LibraryImport(HTTPAPI, SetLastError = true)]
-    internal static unsafe partial uint HttpQueryRequestProperty(SafeHandle requestQueueHandle, ulong requestId, HTTP_REQUEST_PROPERTY propertyId,
-        void* qualifier, ulong qualifierSize, void* output, ulong outputSize, ulong* bytesReturned, IntPtr overlapped);
+    internal delegate uint HttpGetRequestPropertyInvoker(SafeHandle requestQueueHandle, ulong requestId, HTTP_REQUEST_PROPERTY propertyId,
+        void* qualifier, uint qualifierSize, void* output, uint outputSize, uint* bytesReturned, IntPtr overlapped);
 
     internal delegate uint HttpSetRequestPropertyInvoker(SafeHandle requestQueueHandle, ulong requestId, HTTP_REQUEST_PROPERTY propertyId, void* input, uint inputSize, IntPtr overlapped);
 
@@ -123,6 +122,7 @@ internal static HTTP_API_VERSION ApiVersion
     }
 
     internal static SafeLibraryHandle? HttpApiModule { get; private set; }
+    internal static HttpGetRequestPropertyInvoker? HttpGetRequestProperty { get; private set; }
     internal static HttpSetRequestPropertyInvoker? HttpSetRequestProperty { get; private set; }
     [MemberNotNullWhen(true, nameof(HttpSetRequestProperty))]
     internal static bool SupportsTrailers { get; private set; }
@@ -147,6 +147,7 @@ private static void InitHttpApi(ushort majorVersion, ushort minorVersion)
         if (supported)
         {
             HttpApiModule = SafeLibraryHandle.Open(HTTPAPI);
+            HttpGetRequestProperty = HttpApiModule.GetProcAddress<HttpGetRequestPropertyInvoker>("HttpQueryRequestProperty", throwIfNotFound: false);
             HttpSetRequestProperty = HttpApiModule.GetProcAddress<HttpSetRequestPropertyInvoker>("HttpSetRequestProperty", throwIfNotFound: false);
             SupportsReset = HttpSetRequestProperty != null;
             SupportsTrailers = IsFeatureSupported(HTTP_FEATURE_ID.HttpFeatureResponseTrailers);

src/Servers/HttpSys/src/RequestProcessing/Request.cs

@@ -169,6 +169,7 @@ internal Request(RequestContext requestContext)
 
         User = RequestContext.GetUser();
 
+        SniHostName = string.Empty;
         if (IsHttps)
         {
             GetTlsHandshakeResults();
@@ -327,7 +328,7 @@ private AspNetCore.HttpSys.Internal.SocketAddress LocalEndPoint
 
     internal WindowsPrincipal User { get; }
 
-    public string? SniHostName { get; private set; }
+    public string SniHostName { get; private set; }
 
     public SslProtocols Protocol { get; private set; }
 

src/Servers/HttpSys/src/RequestProcessing/RequestContext.FeatureCollection.cs

@@ -587,7 +587,7 @@ bool IHttpBodyControlFeature.AllowSynchronousIO
 
     int ITlsHandshakeFeature.KeyExchangeStrength => Request.KeyExchangeStrength;
 
-    string? ITlsHandshakeFeature.HostName => Request.SniHostName;
+    string ITlsHandshakeFeature.HostName => Request.SniHostName;
 
     IReadOnlyDictionary<int, ReadOnlyMemory<byte>> IHttpSysRequestInfoFeature.RequestInfo => Request.RequestInfo;
 

src/Servers/HttpSys/src/RequestProcessing/RequestContext.cs

@@ -8,7 +8,6 @@
 using Microsoft.AspNetCore.Http;
 using Microsoft.AspNetCore.HttpSys.Internal;
 using Microsoft.Extensions.Logging;
-using static Microsoft.AspNetCore.HttpSys.Internal.UnsafeNclNativeMethods;
 
 namespace Microsoft.AspNetCore.Server.HttpSys;
 
@@ -228,25 +227,28 @@ internal void ForceCancelRequest()
 
     internal unsafe HttpApiTypes.HTTP_REQUEST_PROPERTY_SNI GetClientSni()
     {
+        if (HttpApi.HttpGetRequestProperty != null)
+        {
             var buffer = new byte[HttpApiTypes.SniPropertySizeInBytes];
             fixed (byte* pBuffer = buffer)
             {
-                var statusCode = HttpApi.HttpQueryRequestProperty(
+                var statusCode = HttpApi.HttpGetRequestProperty(
                     Server.RequestQueue.Handle,
                     RequestId,
                     HttpApiTypes.HTTP_REQUEST_PROPERTY.HttpRequestPropertySni,
                     qualifier: null,
                     qualifierSize: 0,
                     (void*)pBuffer,
-                    (ulong)buffer.Length,
+                    (uint)buffer.Length,
                     bytesReturned: null,
                     IntPtr.Zero);
 
-                if (statusCode == ErrorCodes.ERROR_SUCCESS)
+                if (statusCode == UnsafeNclNativeMethods.ErrorCodes.ERROR_SUCCESS)
                 {
                     return Marshal.PtrToStructure<HttpApiTypes.HTTP_REQUEST_PROPERTY_SNI>((IntPtr)pBuffer);
                 }
             }
+        }
 
         return default;
     }

src/Servers/HttpSys/test/FunctionalTests/HttpsTests.cs

@@ -2,7 +2,6 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 using System;
-using System.Data.Common;
 using System.Diagnostics;
 using System.IO;
 using System.Net.Http;

src/Servers/Kestrel/Core/src/Internal/TlsConnectionFeature.cs

@@ -42,7 +42,7 @@ public X509Certificate2? ClientCertificate
         }
     }
 
-    public string? HostName { get; set; }
+    public string HostName { get; set; } = string.Empty;
 
     public ReadOnlyMemory<byte> ApplicationProtocol => _sslStream.NegotiatedApplicationProtocol.Protocol;
 

src/Servers/Kestrel/Core/src/Middleware/HttpsConnectionMiddleware.cs

@@ -313,7 +313,7 @@ private Task DoOptionsBasedHandshakeAsync(ConnectionContext context, SslStream s
         {
             selector = (sender, name) =>
             {
-                feature.HostName = name;
+                feature.HostName = name ?? string.Empty;
                 var cert = _serverCertificateSelector(context, name);
                 if (cert != null)
                 {

src/Shared/HttpSys/NativeInterop/HttpApiTypes.cs

@@ -4,7 +4,6 @@
 
 using System;
 using System.Collections.Generic;
-using System.Runtime.CompilerServices;
 using System.Runtime.InteropServices;
 using System.Security.Authentication;
 using Microsoft.AspNetCore.Http;
@@ -109,8 +108,8 @@ internal struct HTTP_REQUEST_PROPERTY_STREAM_ERROR
         internal uint ErrorCode;
     }
 
-    internal const int HTTP_REQUEST_PROPERTY_SNI_HOST_MAX_LENGTH = 255;
-    internal const int SniPropertySizeInBytes = (sizeof(ushort) * (HTTP_REQUEST_PROPERTY_SNI_HOST_MAX_LENGTH + 1)) + sizeof(ulong);
+    private const int HTTP_REQUEST_PROPERTY_SNI_HOST_MAX_LENGTH = 255;
+    internal const int SniPropertySizeInBytes = (sizeof(ushort) * (HTTP_REQUEST_PROPERTY_SNI_HOST_MAX_LENGTH + 1)) + sizeof(uint);
 
     [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode, Size = SniPropertySizeInBytes)]
     internal struct HTTP_REQUEST_PROPERTY_SNI