[WASI] System.Net.NameResolution

src/libraries/Common/src/Interop/Unix/System.Native/Interop.GetHostName.cs

@@ -14,6 +14,11 @@ internal static partial class Sys
 
         internal static unsafe string GetHostName()
         {
+            if (OperatingSystem.IsWasi())
+            {
+                return "localhost";
+            }
+
             const int HOST_NAME_MAX = 255;
             const int ArrLength = HOST_NAME_MAX + 1;
 

src/libraries/Common/src/Interop/Unix/System.Native/Interop.HostEntry.cs

@@ -21,6 +21,7 @@ internal enum GetAddrInfoErrorFlags : int
             EAI_BADARG = 6,     // One or more input arguments were invalid.
             EAI_NOMORE = 7,     // No more entries are present in the list.
             EAI_MEMORY = 8,     // Out of memory.
+            EAI_SYSTEM = 9,     // Other system error; errno is set to indicate the error.
         }
 
         [StructLayout(LayoutKind.Sequential)]

src/libraries/System.Net.NameResolution/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.NameResolution/src/System.Net.NameResolution.csproj

@@ -9,14 +9,14 @@
   <!-- DesignTimeBuild requires all the TargetFramework Derived Properties to not be present in the first property group. -->
   <PropertyGroup>
     <TargetPlatformIdentifier>$([MSBuild]::GetTargetPlatformIdentifier('$(TargetFramework)'))</TargetPlatformIdentifier>
-    <GeneratePlatformNotSupportedAssemblyMessage Condition="'$(TargetPlatformIdentifier)' == 'browser' or '$(TargetPlatformIdentifier)' == 'wasi' or '$(TargetPlatformIdentifier)' == ''">SR.SystemNetNameResolution_PlatformNotSupported</GeneratePlatformNotSupportedAssemblyMessage>
-    <ApiExclusionListPath Condition="'$(TargetPlatformIdentifier)' == 'browser' or '$(TargetPlatformIdentifier)' == 'wasi'">ExcludeApiList.PNSE.Browser.txt</ApiExclusionListPath>
+    <GeneratePlatformNotSupportedAssemblyMessage Condition="'$(TargetPlatformIdentifier)' == 'browser' or '$(TargetPlatformIdentifier)' == ''">SR.SystemNetNameResolution_PlatformNotSupported</GeneratePlatformNotSupportedAssemblyMessage>
+    <ApiExclusionListPath Condition="'$(TargetPlatformIdentifier)' == 'browser'">ExcludeApiList.PNSE.Browser.txt</ApiExclusionListPath>
   </PropertyGroup>
 
   <ItemGroup Condition="'$(GeneratePlatformNotSupportedAssemblyMessage)' == ''">
     <Compile Include="System\Net\Dns.cs" />
     <Compile Include="System\Net\IPHostEntry.cs" />
-    <Compile Include="System\Net\NetEventSource.NameResolution.cs" />
+    <Compile Include="System\Net\NetEventSource.NameResolution.cs" Condition="'$(TargetPlatformIdentifier)' != 'wasi'" />
     <Compile Include="System\Net\NameResolutionMetrics.cs" />
     <Compile Include="System\Net\NameResolutionTelemetry.cs" />
     <!-- Logging -->
@@ -80,6 +80,8 @@
              Link="Common\Interop\CoreLib\Unix\Interop.Errors.cs" />
     <Compile Include="$(CommonPath)Interop\Unix\Interop.Libraries.cs"
              Link="Common\Interop\Unix\Interop.Libraries.cs" />
+    <Compile Include="$(CommonPath)Interop\Unix\System.Native\Interop.ErrNo.cs"
+             Link="Common\Interop\Unix\System.Native\Interop.ErrNo.cs"/>
     <Compile Include="$(CommonPath)Interop\Unix\System.Native\Interop.Close.cs"
              Link="Common\Interop\Unix\System.Native\Interop.Close.cs" />
     <Compile Include="$(CommonPath)Interop\Unix\System.Native\Interop.GetHostName.cs"
@@ -96,10 +98,41 @@
              Link="Common\Interop\Unix\System.Native\Interop.SocketAddress.cs" />
   </ItemGroup>
 
-  <ItemGroup Condition="'$(TargetPlatformIdentifier)' == 'browser' or '$(TargetPlatformIdentifier)' == 'wasi'">
+  <ItemGroup Condition="'$(TargetPlatformIdentifier)' == 'browser'">
     <Compile Include="System\Net\Dns.Browser.cs" />
   </ItemGroup>
 
+  <ItemGroup Condition="'$(TargetPlatformIdentifier)' == 'wasi'">
+    <Compile Include="$(CommonPath)Interop\Unix\System.Native\Interop.GetHostName.cs"
+             Link="Common\Interop\Unix\System.Native\Interop.GetHostName.cs" />
+    <Compile Include="$(CommonPath)Interop\Unix\System.Native\Interop.ErrNo.cs"
+             Link="Common\Interop\Unix\System.Native\Interop.ErrNo.cs"/>
+
+    <Compile Include="System\Net\NameResolutionPal.Unix.cs" />
+    <Compile Include="$(CommonPath)System\Net\InteropIPAddressExtensions.Unix.cs"
+             Link="Common\System\Net\InteropIPAddressExtensions.Unix.cs" />
+    <Compile Include="$(CommonPath)System\Net\SocketAddressPal.Unix.cs"
+             Link="Common\System\Net\Internals\SocketAddressPal.Unix.cs" />
+    <Compile Include="$(CommonPath)System\Net\SocketProtocolSupportPal.Unix.cs"
+             Link="Common\System\Net\SocketProtocolSupportPal.Unix" />
+    <Compile Include="$(CommonPath)Interop\Unix\Interop.Errors.cs"
+             Link="Common\Interop\CoreLib\Unix\Interop.Errors.cs" />
+    <Compile Include="$(CommonPath)Interop\Unix\Interop.Libraries.cs"
+             Link="Common\Interop\Unix\Interop.Libraries.cs" />
+    <Compile Include="$(CommonPath)Interop\Unix\System.Native\Interop.Close.cs"
+             Link="Common\Interop\Unix\System.Native\Interop.Close.cs" />
+    <Compile Include="$(CommonPath)Interop\Unix\System.Native\Interop.GetNameInfo.cs"
+             Link="Common\Interop\Unix\System.Native\Interop.GetNameInfo.cs" />
+    <Compile Include="$(CommonPath)Interop\Unix\System.Native\Interop.HostEntry.cs"
+             Link="Common\Interop\Unix\System.Native\Interop.HostEntries.cs" />
+    <Compile Include="$(CommonPath)Interop\Unix\System.Native\Interop.IPAddress.cs"
+             Link="Common\Interop\Unix\System.Native\Interop.IPAddress.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.SocketAddress.cs"
+             Link="Common\Interop\Unix\System.Native\Interop.SocketAddress.cs" />
+  </ItemGroup>
+
   <ItemGroup>
     <Reference Include="Microsoft.Win32.Primitives" />
     <Reference Include="System.Collections" />

src/libraries/System.Net.NameResolution/src/System/Net/Dns.cs

@@ -7,6 +7,7 @@
 using System.Net.Sockets;
 using System.Threading;
 using System.Threading.Tasks;
+using System.Runtime.Versioning;
 
 namespace System.Net
 {
@@ -37,6 +38,8 @@ public static string GetHostName()
 
         public static IPHostEntry GetHostEntry(IPAddress address)
         {
+            if (OperatingSystem.IsWasi()) throw new PlatformNotSupportedException(); // TODO remove with https://github.com/dotnet/runtime/pull/107185
+
             ArgumentNullException.ThrowIfNull(address);
 
             if (address.Equals(IPAddress.Any) || address.Equals(IPAddress.IPv6Any))
@@ -68,7 +71,7 @@ public static IPHostEntry GetHostEntry(string hostNameOrAddress, AddressFamily f
 
             // See if it's an IP Address.
             IPHostEntry ipHostEntry;
-            if (IPAddress.TryParse(hostNameOrAddress, out IPAddress? address))
+            if (NameResolutionPal.SupportsGetNameInfo && IPAddress.TryParse(hostNameOrAddress, out IPAddress? address))
             {
                 if (address.Equals(IPAddress.Any) || address.Equals(IPAddress.IPv6Any))
                 {
@@ -147,6 +150,8 @@ public static Task<IPHostEntry> GetHostEntryAsync(string hostNameOrAddress, Addr
 
         public static Task<IPHostEntry> GetHostEntryAsync(IPAddress address)
         {
+            if (OperatingSystem.IsWasi()) throw new PlatformNotSupportedException(); // TODO remove with https://github.com/dotnet/runtime/pull/107185
+
             ArgumentNullException.ThrowIfNull(address);
 
             if (address.Equals(IPAddress.Any) || address.Equals(IPAddress.IPv6Any))
@@ -156,6 +161,8 @@ public static Task<IPHostEntry> GetHostEntryAsync(IPAddress address)
             }
 
             return RunAsync(static (s, activity) => {
+                if (OperatingSystem.IsWasi()) throw new PlatformNotSupportedException(); // TODO remove with https://github.com/dotnet/runtime/pull/107185
+
                 IPHostEntry ipHostEntry = GetHostEntryCore((IPAddress)s, AddressFamily.Unspecified, activity);
                 if (NetEventSource.Log.IsEnabled()) NetEventSource.Info((IPAddress)s, $"{ipHostEntry} with {ipHostEntry.AddressList.Length} entries");
                 return ipHostEntry;
@@ -170,6 +177,8 @@ public static IAsyncResult BeginGetHostEntry(string hostNameOrAddress, AsyncCall
 
         public static IPHostEntry EndGetHostEntry(IAsyncResult asyncResult)
         {
+            if (OperatingSystem.IsWasi()) throw new PlatformNotSupportedException(); // TODO remove with https://github.com/dotnet/runtime/pull/107185
+
             ArgumentNullException.ThrowIfNull(asyncResult);
 
             return TaskToAsyncResult.End<IPHostEntry>(asyncResult);
@@ -244,6 +253,8 @@ public static IAsyncResult BeginGetHostAddresses(string hostNameOrAddress, Async
 
         public static IPAddress[] EndGetHostAddresses(IAsyncResult asyncResult)
         {
+            if (OperatingSystem.IsWasi()) throw new PlatformNotSupportedException(); // TODO remove with https://github.com/dotnet/runtime/pull/107185
+
             ArgumentNullException.ThrowIfNull(asyncResult);
 
             return TaskToAsyncResult.End<IPAddress[]>(asyncResult);
@@ -269,6 +280,8 @@ public static IAsyncResult BeginGetHostByName(string hostName, AsyncCallback? re
         [Obsolete("EndGetHostByName has been deprecated. Use EndGetHostEntry instead.")]
         public static IPHostEntry EndGetHostByName(IAsyncResult asyncResult)
         {
+            if (OperatingSystem.IsWasi()) throw new PlatformNotSupportedException(); // TODO remove with https://github.com/dotnet/runtime/pull/107185
+
             ArgumentNullException.ThrowIfNull(asyncResult);
 
             return TaskToAsyncResult.End<IPHostEntry>(asyncResult);
@@ -277,6 +290,8 @@ public static IPHostEntry EndGetHostByName(IAsyncResult asyncResult)
         [Obsolete("GetHostByAddress has been deprecated. Use GetHostEntry instead.")]
         public static IPHostEntry GetHostByAddress(string address)
         {
+            if (OperatingSystem.IsWasi()) throw new PlatformNotSupportedException(); // TODO remove with https://github.com/dotnet/runtime/pull/107185
+
             ArgumentNullException.ThrowIfNull(address);
 
             IPHostEntry ipHostEntry = GetHostEntryCore(IPAddress.Parse(address), AddressFamily.Unspecified);
@@ -288,6 +303,8 @@ public static IPHostEntry GetHostByAddress(string address)
         [Obsolete("GetHostByAddress has been deprecated. Use GetHostEntry instead.")]
         public static IPHostEntry GetHostByAddress(IPAddress address)
         {
+            if (OperatingSystem.IsWasi()) throw new PlatformNotSupportedException(); // TODO remove with https://github.com/dotnet/runtime/pull/107185
+
             ArgumentNullException.ThrowIfNull(address);
 
             IPHostEntry ipHostEntry = GetHostEntryCore(address, AddressFamily.Unspecified);
@@ -303,7 +320,7 @@ public static IPHostEntry Resolve(string hostName)
 
             // See if it's an IP Address.
             IPHostEntry ipHostEntry;
-            if (IPAddress.TryParse(hostName, out IPAddress? address) &&
+            if (NameResolutionPal.SupportsGetNameInfo && IPAddress.TryParse(hostName, out IPAddress? address) &&
                 (address.AddressFamily != AddressFamily.InterNetworkV6 || SocketProtocolSupportPal.OSSupportsIPv6))
             {
                 try
@@ -332,6 +349,8 @@ public static IAsyncResult BeginResolve(string hostName, AsyncCallback? requestC
         [Obsolete("EndResolve has been deprecated. Use EndGetHostEntry instead.")]
         public static IPHostEntry EndResolve(IAsyncResult asyncResult)
         {
+            if (OperatingSystem.IsWasi()) throw new PlatformNotSupportedException(); // TODO remove with https://github.com/dotnet/runtime/pull/107185
+
             IPHostEntry ipHostEntry;
 
             try
@@ -414,6 +433,8 @@ private static IPAddress[] GetHostAddressesCore(IPAddress address, AddressFamily
         // Does internal IPAddress reverse and then forward lookups (for Legacy and current public methods).
         private static object GetHostEntryOrAddressesCore(IPAddress address, bool justAddresses, AddressFamily addressFamily, NameResolutionActivity? activityOrDefault = default)
         {
+            if (OperatingSystem.IsWasi()) throw new PlatformNotSupportedException(); // TODO remove with https://github.com/dotnet/runtime/pull/107185
+
             // Try to get the data for the host from its address.
             // We need to call getnameinfo first, because getaddrinfo w/ the ipaddress string
             // will only return that address and not the full list.
@@ -500,7 +521,7 @@ private static Task GetHostEntryOrAddressesCoreAsync(string hostName, bool justR
             object asyncState;
 
             // See if it's an IP Address.
-            if (IPAddress.TryParse(hostName, out IPAddress? ipAddress))
+            if (NameResolutionPal.SupportsGetNameInfo && IPAddress.TryParse(hostName, out IPAddress? ipAddress))
             {
                 if (throwOnIIPAny && (ipAddress.Equals(IPAddress.Any) || ipAddress.Equals(IPAddress.IPv6Any)))
                 {

src/libraries/System.Net.NameResolution/src/System/Net/NameResolutionPal.Unix.cs

@@ -8,13 +8,17 @@
 using System.Text;
 using System.Threading;
 using System.Threading.Tasks;
+using System.Runtime.Versioning;
 
 namespace System.Net
 {
     internal static partial class NameResolutionPal
     {
         public const bool SupportsGetAddrInfoAsync = false;
 
+        [UnsupportedOSPlatformGuard("wasi")]
+        public static bool SupportsGetNameInfo => !OperatingSystem.IsWasi();
+
 #pragma warning disable IDE0060
         internal static Task? GetAddrInfoAsync(string hostName, bool justAddresses, AddressFamily family, CancellationToken cancellationToken) =>
             throw new NotSupportedException();
@@ -39,6 +43,9 @@ private static SocketError GetSocketErrorForNativeError(int error)
                     return SocketError.HostNotFound;
                 case (int)Interop.Sys.GetAddrInfoErrorFlags.EAI_MEMORY:
                     throw new OutOfMemoryException();
+                case (int)Interop.Sys.GetAddrInfoErrorFlags.EAI_SYSTEM:
+                    Debug.Fail($"Unexpected error: {error} errno: {Interop.Sys.GetErrNo()}");
+                    return SocketError.SocketError;
                 default:
                     Debug.Fail($"Unexpected error: {error}");
                     return SocketError.SocketError;
@@ -146,6 +153,8 @@ public static unsafe SocketError TryGetAddrInfo(string name, bool justAddresses,
 
         public static unsafe string? TryGetNameInfo(IPAddress addr, out SocketError socketError, out int nativeErrorCode)
         {
+            if (OperatingSystem.IsWasi()) throw new PlatformNotSupportedException(); // TODO remove with https://github.com/dotnet/runtime/pull/107185
+
             byte* buffer = stackalloc byte[Interop.Sys.NI_MAXHOST + 1 /*for null*/];
 
             byte isIPv6;

src/libraries/System.Net.NameResolution/src/System/Net/NameResolutionPal.Windows.cs

@@ -9,6 +9,7 @@
 using System.Threading;
 using System.Threading.Tasks;
 using Microsoft.Win32.SafeHandles;
+using System.Runtime.Versioning;
 
 namespace System.Net
 {
@@ -43,6 +44,8 @@ static void Initialize()
             }
         }
 
+        public const bool SupportsGetNameInfo = true;
+
         public static unsafe SocketError TryGetAddrInfo(string name, bool justAddresses, AddressFamily addressFamily, out string? hostName, out string[] aliases, out IPAddress[] addresses, out int nativeErrorCode)
         {
             Interop.Winsock.EnsureInitialized();

src/libraries/System.Net.NameResolution/src/System/Net/NameResolutionTelemetry.cs

@@ -59,7 +59,7 @@ protected override void OnEventCommand(EventCommandEventArgs command)
         private void ResolutionFailed() => WriteEvent(ResolutionFailedEventId);
 
         [NonEvent]
-        public static bool AnyDiagnosticsEnabled() => Log.IsEnabled() || NameResolutionMetrics.IsEnabled() || NameResolutionActivity.IsTracingEnabled();
+        public static bool AnyDiagnosticsEnabled() => !OperatingSystem.IsWasi() && (Log.IsEnabled() || NameResolutionMetrics.IsEnabled() || NameResolutionActivity.IsTracingEnabled());
 
         [NonEvent]
         public NameResolutionActivity BeforeResolution(object hostNameOrAddress, long startingTimestamp = 0)
@@ -91,6 +91,8 @@ public NameResolutionActivity BeforeResolution(object hostNameOrAddress, long st
         [NonEvent]
         public void AfterResolution(object hostNameOrAddress, in NameResolutionActivity activity, object? answer, Exception? exception = null)
         {
+            if (OperatingSystem.IsWasi()) return;
+
             if (!activity.Stop(answer, exception, out TimeSpan duration))
             {
                 // We stopped the System.Diagnostics.Activity at this point and neither metrics nor EventSource is enabled.

src/libraries/System.Net.NameResolution/tests/FunctionalTests/GetHostAddressesTest.cs

@@ -69,14 +69,14 @@ public async Task Dns_GetHostAddressesAsync_NullHost_Fail()
             await Assert.ThrowsAsync<ArgumentNullException>(() => Dns.GetHostAddressesAsync(null));
         }
 
-        [Fact]
+        [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsThreadingSupported))]
         public void DnsBeginGetHostAddresses_BadName_Throws()
         {
             IAsyncResult asyncObject = Dns.BeginGetHostAddresses("BadName", null, null);
             Assert.ThrowsAny<SocketException>(() => Dns.EndGetHostAddresses(asyncObject));
         }
 
-        [Fact]
+        [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsThreadingSupported))]
         public void DnsBeginGetHostAddresses_BadIpString_ReturnsAddress()
         {
             IAsyncResult asyncObject = Dns.BeginGetHostAddresses("0.0.1.1", null, null);
@@ -86,7 +86,7 @@ public void DnsBeginGetHostAddresses_BadIpString_ReturnsAddress()
             Assert.Equal(IPAddress.Parse("0.0.1.1"), results[0]);
         }
 
-        [Fact]
+        [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsThreadingSupported))]
         public void DnsBeginGetHostAddresses_MachineName_MatchesGetHostAddresses()
         {
             IAsyncResult asyncObject = Dns.BeginGetHostAddresses(TestSettings.LocalHost, null, null);

src/libraries/System.Net.NameResolution/tests/FunctionalTests/GetHostByAddressTest.cs

@@ -8,6 +8,7 @@
 
 namespace System.Net.NameResolution.Tests
 {
+    [SkipOnPlatform(TestPlatforms.Wasi, "WASI has no getnameinfo")]
     public class GetHostByAddressTest
     {
         [Fact]

src/libraries/System.Net.NameResolution/tests/FunctionalTests/GetHostByNameTest.cs

@@ -19,7 +19,7 @@ public void DnsObsoleteBeginGetHostByName_BadName_Throws()
             Assert.ThrowsAny<SocketException>(() => Dns.EndGetHostByName(asyncObject));
         }
 
-        [Fact]
+        [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsThreadingSupported))]
         public void DnsObsoleteBeginGetHostByName_IPv4String_ReturnsOnlyGivenIP()
         {
             IAsyncResult asyncObject = Dns.BeginGetHostByName(IPAddress.Loopback.ToString(), null, null);
@@ -106,6 +106,7 @@ public void DnsObsoleteGetHostByName_IPv6String_ReturnsOnlyGivenIP()
         [ActiveIssue("https://github.com/dotnet/runtime/issues/1488", TestPlatforms.OSX)]
         [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsNotArm64Process))] // [ActiveIssue("https://github.com/dotnet/runtime/issues/27622")]
         [ActiveIssue("https://github.com/dotnet/runtime/issues/51377", TestPlatforms.iOS | TestPlatforms.tvOS | TestPlatforms.MacCatalyst)]
+        [ActiveIssue("https://github.com/dotnet/runtime/issues/107339", TestPlatforms.Wasi)]
         public void DnsObsoleteGetHostByName_EmptyString_ReturnsHostName()
         {
             IPHostEntry entry = Dns.GetHostByName("");