Return error on DNS resolution when guest internet access is disabled (#2983)

* Return error on DNS resolution when guest internet access is disabled

* Log DNS lookup calls

Ryujinx.HLE/HOS/Services/Sockets/Sfdnsres/IResolver.cs

@@ -245,6 +245,15 @@ namespace Ryujinx.HLE.HOS.Services.Sockets.Sfdnsres
         {
             string host = MemoryHelper.ReadAsciiString(context.Memory, inputBufferPosition, (int)inputBufferSize);
 
+            if (!context.Device.Configuration.EnableInternetAccess)
+            {
+                Logger.Info?.Print(LogClass.ServiceSfdnsres, $"Guest network access disabled, DNS Blocked: {host}");
+
+                WriteResponse(context, withOptions, 0, GaiError.NoData, NetDbError.HostNotFound);
+
+                return ResultCode.Success;
+            }
+
             // TODO: Use params.
             bool  enableNsdResolve = (context.RequestData.ReadInt32() & 1) != 0;
             int   timeOut          = context.RequestData.ReadInt32();
@@ -331,6 +340,15 @@ namespace Ryujinx.HLE.HOS.Services.Sockets.Sfdnsres
             ulong optionsBufferPosition,
             ulong optionsBufferSize)
         {
+            if (!context.Device.Configuration.EnableInternetAccess)
+            {
+                Logger.Info?.Print(LogClass.ServiceSfdnsres, $"Guest network access disabled, DNS Blocked.");
+
+                WriteResponse(context, withOptions, 0, GaiError.NoData, NetDbError.HostNotFound);
+
+                return ResultCode.Success;
+            }
+
             byte[] rawIp = new byte[inputBufferSize];
 
             context.Memory.Read(inputBufferPosition, rawIp);
@@ -442,6 +460,15 @@ namespace Ryujinx.HLE.HOS.Services.Sockets.Sfdnsres
             string host    = MemoryHelper.ReadAsciiString(context.Memory, context.Request.SendBuff[0].Position, (long)context.Request.SendBuff[0].Size);
             string service = MemoryHelper.ReadAsciiString(context.Memory, context.Request.SendBuff[1].Position, (long)context.Request.SendBuff[1].Size);
 
+            if (!context.Device.Configuration.EnableInternetAccess)
+            {
+                Logger.Info?.Print(LogClass.ServiceSfdnsres, $"Guest network access disabled, DNS Blocked: {host}");
+
+                WriteResponse(context, withOptions, 0, GaiError.NoData, NetDbError.HostNotFound);
+
+                return ResultCode.Success;
+            }
+
             // NOTE: We ignore hints for now.
             DeserializeAddrInfos(context.Memory, (ulong)context.Request.SendBuff[2].Position, (ulong)context.Request.SendBuff[2].Size);