[WASI] sockets

eng/testing/tests.wasi.targets

@@ -49,6 +49,8 @@
     <_XHarnessArgs Condition="'$(WasmXHarnessTestsTimeout)' != ''" >$(_XHarnessArgs) &quot;--timeout=$(WasmXHarnessTestsTimeout)&quot;</_XHarnessArgs>
     <_XHarnessArgs                                                 >$(_XHarnessArgs) --engine-arg=--wasi --engine-arg=http</_XHarnessArgs>
     <_XHarnessArgs                                                 >$(_XHarnessArgs) --engine-arg=--wasi --engine-arg=inherit-network</_XHarnessArgs>
+    <_XHarnessArgs                                                 >$(_XHarnessArgs) --engine-arg=--wasi --engine-arg=tcp</_XHarnessArgs>
+    <_XHarnessArgs                                                 >$(_XHarnessArgs) --engine-arg=--wasi --engine-arg=udp</_XHarnessArgs>
     <_XHarnessArgs                                                 >$(_XHarnessArgs) --engine-arg=--wasi --engine-arg=allow-ip-name-lookup</_XHarnessArgs>
     <_XHarnessArgs                                                 >$(_XHarnessArgs) --engine-arg=--env --engine-arg=DOTNET_WASI_PRINT_EXIT_CODE=1</_XHarnessArgs>
     <_XHarnessArgs Condition="'$(WasmXHarnessArgsCli)' != ''"      >$(_XHarnessArgs) $(WasmXHarnessArgsCli)</_XHarnessArgs>

src/libraries/Common/src/Interop/Wasi/System.Native/Interop.SocketEvent.cs

@@ -0,0 +1,25 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+using System;
+using System.Runtime.InteropServices;
+
+internal static partial class Interop
+{
+    internal static partial class Sys
+    {
+        [Flags]
+        internal enum SocketEvents : int
+        {
+            None = 0x00,
+            Read = 0x01,
+            Write = 0x02,
+            ReadClose = 0x04,
+            Close = 0x08,
+            Error = 0x10
+        }
+
+        [LibraryImport(Libraries.SystemNative, EntryPoint = "SystemNative_GetWasiSocketDescriptor")]
+        internal static unsafe partial Error GetWasiSocketDescriptor(IntPtr socket, IntPtr* entry);
+    }
+}

src/libraries/Common/src/System/Net/SocketProtocolSupportPal.Unix.cs

@@ -14,7 +14,7 @@ private static unsafe bool IsSupported(AddressFamily af)
         {
             // Check for AF_UNIX on iOS/tvOS. The OS claims to support this, but returns EPERM on bind.
             // We should explicitly set the return here to false, to avoid giving a false impression.
-            if (af == AddressFamily.Unix && (OperatingSystem.IsTvOS() || (OperatingSystem.IsIOS() && !OperatingSystem.IsMacCatalyst())))
+            if (af == AddressFamily.Unix && (OperatingSystem.IsTvOS() || OperatingSystem.IsWasi() || (OperatingSystem.IsIOS() && !OperatingSystem.IsMacCatalyst())))
             {
                 return false;
             }

src/libraries/Common/src/System/Threading/Tasks/TaskToAsyncResult.cs

@@ -32,6 +32,8 @@ static class TaskToAsyncResult
         public static IAsyncResult Begin(Task task, AsyncCallback? callback, object? state)
         {
 #if NET
+            if (OperatingSystem.IsWasi()) throw new PlatformNotSupportedException(); // TODO remove with https://github.com/dotnet/runtime/pull/107185
+
             ArgumentNullException.ThrowIfNull(task);
 #else
             if (task is null)

src/libraries/System.IO.Pipes/tests/NamedPipeTests/NamedPipeTest.UnixDomainSockets.cs

@@ -7,6 +7,7 @@
 
 namespace System.IO.Pipes.Tests
 {
+    [SkipOnPlatform(TestPlatforms.Wasi, "Wasi doesn't support UnixDomain")]
     public class NamedPipeTest_UnixDomainSockets
     {
         [Fact]

src/libraries/System.Net.Sockets/Directory.Build.props

@@ -3,7 +3,6 @@
   <PropertyGroup>
     <StrongNameKeyId>Microsoft</StrongNameKeyId>
     <IncludePlatformAttributes>true</IncludePlatformAttributes>
-    <!-- WASI until https://github.com/dotnet/runtime/issues/98957 -->
-    <UnsupportedOSPlatforms>browser;wasi</UnsupportedOSPlatforms>
+    <UnsupportedOSPlatforms>browser</UnsupportedOSPlatforms>
   </PropertyGroup>
 </Project>

src/libraries/System.Net.Sockets/src/System.Net.Sockets.csproj

@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFrameworks>$(NetCoreAppCurrent)-windows;$(NetCoreAppCurrent)-unix;$(NetCoreAppCurrent)-osx;$(NetCoreAppCurrent)-ios;$(NetCoreAppCurrent)-tvos;$(NetCoreAppCurrent)</TargetFrameworks>
+    <TargetFrameworks>$(NetCoreAppCurrent)-windows;$(NetCoreAppCurrent)-unix;$(NetCoreAppCurrent)-osx;$(NetCoreAppCurrent)-ios;$(NetCoreAppCurrent)-tvos;$(NetCoreAppCurrent)-wasi;$(NetCoreAppCurrent)</TargetFrameworks>
     <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
     <!-- SYSTEM_NET_SOCKETS_DLL is required to allow source-level code sharing for types defined within the
          System.Net.Internals namespace. -->
@@ -48,7 +48,7 @@
     <Compile Include="System\Net\Sockets\TransmitFileOptions.cs" />
     <Compile Include="System\Net\Sockets\UDPClient.cs" />
     <Compile Include="System\Net\Sockets\UdpReceiveResult.cs" />
-    <Compile Include="System\Net\Sockets\UnixDomainSocketEndPoint.cs" />
+    <Compile Include="System\Net\Sockets\UnixDomainSocketEndPoint.cs"  Condition="'$(TargetPlatformIdentifier)' != 'wasi'"/>
     <!-- Common sources -->
     <Compile Include="$(CommonPath)DisableRuntimeMarshalling.cs"
              Link="Common\DisableRuntimeMarshalling.cs" />
@@ -183,14 +183,28 @@
              Link="Common\System\Net\CompletionPortHelper.Windows.cs" />
   </ItemGroup>
 
+  <ItemGroup Condition="'$(TargetPlatformIdentifier)' == 'wasi'">
+    <Compile Include="System\Net\Sockets\UnixDomainSocketEndPoint.Wasi.cs" />
+    <Compile Include="System\Net\Sockets\SocketAsyncContext.Wasi.cs" />
+    <Compile Include="System\Net\Sockets\SocketAsyncEngine.Wasi.cs"/>
+    <Compile Include="System\Net\Sockets\SocketPal.Wasi.cs" />
+    <Compile Include="$(CommonPath)Interop\Wasi\System.Native\Interop.SocketEvent.cs"
+             Link="Common\Interop\Wasi\System.Native\Interop.SocketEvent.cs" />
+  </ItemGroup>
+
   <ItemGroup Condition="'$(TargetPlatformIdentifier)' == 'unix' or '$(TargetPlatformIdentifier)' == 'osx' or '$(TargetPlatformIdentifier)' == 'ios' or '$(TargetPlatformIdentifier)' == 'tvos'">
+    <Compile Include="System\Net\Sockets\UnixDomainSocketEndPoint.Unix.cs"/>
+    <Compile Include="System\Net\Sockets\SocketAsyncEngine.Unix.cs" />
+    <Compile Include="$(CommonPath)Interop\Unix\System.Native\Interop.SocketEvent.cs"
+             Link="Common\Interop\Unix\System.Native\Interop.SocketEvent.cs" />
+  </ItemGroup>
+
+  <ItemGroup Condition="'$(TargetPlatformIdentifier)' == 'unix' or '$(TargetPlatformIdentifier)' == 'wasi' or '$(TargetPlatformIdentifier)' == 'osx' or '$(TargetPlatformIdentifier)' == 'ios' or '$(TargetPlatformIdentifier)' == 'tvos'">
     <Compile Include="System\Net\Sockets\SafeSocketHandle.Unix.cs" />
     <Compile Include="System\Net\Sockets\Socket.Unix.cs" />
     <Compile Include="System\Net\Sockets\SocketAsyncContext.Unix.cs" />
-    <Compile Include="System\Net\Sockets\SocketAsyncEngine.Unix.cs" />
     <Compile Include="System\Net\Sockets\SocketAsyncEventArgs.Unix.cs" />
     <Compile Include="System\Net\Sockets\SocketPal.Unix.cs" />
-    <Compile Include="System\Net\Sockets\UnixDomainSocketEndPoint.Unix.cs" />
     <Compile Include="$(CommonPath)System\Net\InteropIPAddressExtensions.Unix.cs"
              Link="Common\System\Net\InteropIPAddressExtensions.Unix.cs" />
     <Compile Include="$(CommonPath)System\Net\SocketAddressPal.Unix.cs"
@@ -277,8 +291,6 @@
              Link="Common\Interop\Unix\System.Native\Interop.Shutdown.cs" />
     <Compile Include="$(CommonPath)Interop\Unix\System.Native\Interop.Socket.cs"
              Link="Common\Interop\Unix\System.Native\Interop.Socket.cs" />
-    <Compile Include="$(CommonPath)Interop\Unix\System.Native\Interop.SocketEvent.cs"
-             Link="Common\Interop\Unix\System.Native\Interop.SocketEvent.cs" />
     <Compile Include="$(CommonPath)Interop\Unix\System.Native\Interop.SocketAddress.cs"
              Link="Common\Interop\Unix\System.Native\Interop.SocketAddress.cs" />
     <Compile Include="$(CommonPath)Interop\Unix\System.Native\Interop.Pipe.cs"

src/libraries/System.Net.Sockets/src/System/Net/Sockets/NetworkStream.cs

@@ -46,7 +46,7 @@ public NetworkStream(Socket socket, FileAccess access, bool ownsSocket)
         {
             ArgumentNullException.ThrowIfNull(socket);
 
-            if (!socket.Blocking)
+            if (!OperatingSystem.IsWasi() && !socket.Blocking)
             {
                 // Stream.Read*/Write* are incompatible with the semantics of non-blocking sockets, and
                 // allowing non-blocking sockets could result in non-deterministic failures from those
@@ -118,6 +118,8 @@ public override int ReadTimeout
         {
             get
             {
+                if (OperatingSystem.IsWasi()) throw new PlatformNotSupportedException(); // https://github.com/dotnet/runtime/issues/108151
+
                 int timeout = (int)_streamSocket.GetSocketOption(SocketOptionLevel.Socket, SocketOptionName.ReceiveTimeout)!;
                 if (timeout == 0)
                 {
@@ -127,6 +129,8 @@ public override int ReadTimeout
             }
             set
             {
+                if (OperatingSystem.IsWasi()) throw new PlatformNotSupportedException(); // https://github.com/dotnet/runtime/issues/108151
+
                 if (value <= 0 && value != System.Threading.Timeout.Infinite)
                 {
                     throw new ArgumentOutOfRangeException(nameof(value), SR.net_io_timeout_use_gt_zero);
@@ -141,6 +145,8 @@ public override int WriteTimeout
         {
             get
             {
+                if (OperatingSystem.IsWasi()) throw new PlatformNotSupportedException(); // https://github.com/dotnet/runtime/issues/108151
+
                 int timeout = (int)_streamSocket.GetSocketOption(SocketOptionLevel.Socket, SocketOptionName.SendTimeout)!;
                 if (timeout == 0)
                 {
@@ -150,6 +156,8 @@ public override int WriteTimeout
             }
             set
             {
+                if (OperatingSystem.IsWasi()) throw new PlatformNotSupportedException(); // https://github.com/dotnet/runtime/issues/108151
+
                 if (value <= 0 && value != System.Threading.Timeout.Infinite)
                 {
                     throw new ArgumentOutOfRangeException(nameof(value), SR.net_io_timeout_use_gt_zero);
@@ -218,6 +226,8 @@ public override long Seek(long offset, SeekOrigin origin)
         //     Number of bytes we read, or 0 if the socket is closed.
         public override int Read(byte[] buffer, int offset, int count)
         {
+            if (!Socket.OSSupportsThreads) throw new PlatformNotSupportedException(); // TODO remove with https://github.com/dotnet/runtime/pull/107185
+
             ValidateBufferArguments(buffer, offset, count);
             ThrowIfDisposed();
             if (!CanRead)
@@ -237,6 +247,8 @@ public override int Read(byte[] buffer, int offset, int count)
 
         public override int Read(Span<byte> buffer)
         {
+            if (!Socket.OSSupportsThreads) throw new PlatformNotSupportedException(); // TODO remove with https://github.com/dotnet/runtime/pull/107185
+
             if (GetType() != typeof(NetworkStream))
             {
                 // NetworkStream is not sealed, and a derived type may have overridden Read(byte[], int, int) prior
@@ -260,6 +272,8 @@ public override int Read(Span<byte> buffer)
 
         public override unsafe int ReadByte()
         {
+            if (!Socket.OSSupportsThreads) throw new PlatformNotSupportedException(); // TODO remove with https://github.com/dotnet/runtime/pull/107185
+
             byte b;
             return Read(new Span<byte>(&b, 1)) == 0 ? -1 : b;
         }
@@ -282,6 +296,8 @@ public override unsafe int ReadByte()
         //     way to indicate an error.
         public override void Write(byte[] buffer, int offset, int count)
         {
+            if (!Socket.OSSupportsThreads) throw new PlatformNotSupportedException(); // TODO remove with https://github.com/dotnet/runtime/pull/107185
+
             ValidateBufferArguments(buffer, offset, count);
             ThrowIfDisposed();
             if (!CanWrite)
@@ -303,6 +319,8 @@ public override void Write(byte[] buffer, int offset, int count)
 
         public override void Write(ReadOnlySpan<byte> buffer)
         {
+            if (!Socket.OSSupportsThreads) throw new PlatformNotSupportedException(); // TODO remove with https://github.com/dotnet/runtime/pull/107185
+
             if (GetType() != typeof(NetworkStream))
             {
                 // NetworkStream is not sealed, and a derived type may have overridden Write(byte[], int, int) prior
@@ -414,6 +432,8 @@ protected override void Dispose(bool disposing)
         //     An IASyncResult, representing the read.
         public override IAsyncResult BeginRead(byte[] buffer, int offset, int count, AsyncCallback? callback, object? state)
         {
+            if (!Socket.OSSupportsThreads) throw new PlatformNotSupportedException(); // TODO remove with https://github.com/dotnet/runtime/pull/107185
+
             ValidateBufferArguments(buffer, offset, count);
             ThrowIfDisposed();
             if (!CanRead)
@@ -447,6 +467,8 @@ public override IAsyncResult BeginRead(byte[] buffer, int offset, int count, Asy
         //     The number of bytes read. May throw an exception.
         public override int EndRead(IAsyncResult asyncResult)
         {
+            if (!Socket.OSSupportsThreads) throw new PlatformNotSupportedException(); // TODO remove with https://github.com/dotnet/runtime/pull/107185
+
             ThrowIfDisposed();
             ArgumentNullException.ThrowIfNull(asyncResult);
 
@@ -476,6 +498,8 @@ public override int EndRead(IAsyncResult asyncResult)
         //     An IASyncResult, representing the write.
         public override IAsyncResult BeginWrite(byte[] buffer, int offset, int count, AsyncCallback? callback, object? state)
         {
+            if (!Socket.OSSupportsThreads) throw new PlatformNotSupportedException(); // TODO remove with https://github.com/dotnet/runtime/pull/107185
+
             ValidateBufferArguments(buffer, offset, count);
             ThrowIfDisposed();
             if (!CanWrite)
@@ -506,6 +530,8 @@ public override IAsyncResult BeginWrite(byte[] buffer, int offset, int count, As
         // Returns:  The number of bytes read. May throw an exception.
         public override void EndWrite(IAsyncResult asyncResult)
         {
+            if (!Socket.OSSupportsThreads) throw new PlatformNotSupportedException(); // TODO remove with https://github.com/dotnet/runtime/pull/107185
+
             ThrowIfDisposed();
             ArgumentNullException.ThrowIfNull(asyncResult);
 
@@ -659,6 +685,8 @@ public override void SetLength(long value)
         private int _currentWriteTimeout = -1;
         internal void SetSocketTimeoutOption(SocketShutdown mode, int timeout, bool silent)
         {
+            if (OperatingSystem.IsWasi()) throw new PlatformNotSupportedException(); // https://github.com/dotnet/runtime/issues/108151
+
             if (timeout < 0)
             {
                 timeout = 0; // -1 becomes 0 for the winsock stack

src/libraries/System.Net.Sockets/src/System/Net/Sockets/SafeSocketHandle.Unix.cs

@@ -231,6 +231,11 @@ private unsafe SocketError DoCloseHandle(bool abortive)
             {
                 return SocketPal.GetSocketErrorForErrorCode(CloseHandle(handle));
             }
+            if (OperatingSystem.IsWasi())
+            {
+                // WASI never blocks and doesn't support linger options
+                return SocketPal.GetSocketErrorForErrorCode(CloseHandle(handle));
+            }
 
             // If abortive is not set, we're not running on the finalizer thread, so it's safe to block here.
             // We can honor the linger options set on the socket.  It also means closesocket() might return

src/libraries/System.Net.Sockets/src/System/Net/Sockets/Socket.Unix.cs

@@ -61,6 +61,19 @@ partial void ValidateForMultiConnect(bool isMultiEndpoint)
         private static unsafe void LoadSocketTypeFromHandle(
             SafeSocketHandle handle, out AddressFamily addressFamily, out SocketType socketType, out ProtocolType protocolType, out bool blocking, out bool isListening, out bool isSocket)
         {
+            if (OperatingSystem.IsWasi())
+            {
+                // FIXME: Unify with unix after https://github.com/WebAssembly/wasi-libc/issues/537
+                blocking = false;
+                Interop.Error e = Interop.Sys.GetSocketType(handle, out addressFamily, out socketType, out protocolType, out isListening);
+                if (e == Interop.Error.ENOTSOCK)
+                {
+                    throw new SocketException((int)SocketError.NotSocket);
+                }
+                handle.IsSocket = isSocket = true;
+                return;
+            }
+
             if (Interop.Sys.FStat(handle, out Interop.Sys.FileStatus stat) == -1)
             {
                 throw new SocketException((int)SocketError.NotSocket);