Implement GetCurrentIpConfigInfo (#943)

* Implement GetCurrentIpConfigInfo

This is needed by Rocket League.

Also fix GetCurrentIpConfigInfo to not return ipv6 addresses

* Address Ac_K comment

Ryujinx.HLE/HOS/Services/Nifm/StaticService/IGeneralService.cs

@@ -3,10 +3,12 @@ using Ryujinx.Common.Logging;
 using Ryujinx.HLE.HOS.Services.Nifm.StaticService.GeneralService;
 using Ryujinx.HLE.HOS.Services.Nifm.StaticService.Types;
 using System;
+using System.Diagnostics;
 using System.Linq;
 using System.Net;
 using System.Net.NetworkInformation;
 using System.Net.Sockets;
+using System.Runtime.CompilerServices;
 
 namespace Ryujinx.HLE.HOS.Services.Nifm.StaticService
 {
@@ -57,18 +59,35 @@ namespace Ryujinx.HLE.HOS.Services.Nifm.StaticService
         // GetCurrentIpAddress() -> nn::nifm::IpV4Address
         public ResultCode GetCurrentIpAddress(ServiceCtx context)
         {
-            if (!NetworkInterface.GetIsNetworkAvailable())
+            (_, UnicastIPAddressInformation unicastAddress) = GetLocalInterface();
+
+            if (unicastAddress == null)
             {
                 return ResultCode.NoInternetConnection;
             }
 
-            IPHostEntry host = Dns.GetHostEntry(Dns.GetHostName());
+            context.ResponseData.WriteStruct(new IpV4Address(unicastAddress.Address));
 
-            IPAddress address = host.AddressList.FirstOrDefault(a => a.AddressFamily == AddressFamily.InterNetwork);
+            Logger.PrintInfo(LogClass.ServiceNifm, $"Console's local IP is \"{unicastAddress.Address}\".");
 
-            context.ResponseData.Write(BitConverter.ToUInt32(address.GetAddressBytes()));
+            return ResultCode.Success;
+        }
 
-            Logger.PrintInfo(LogClass.ServiceNifm, $"Console's local IP is \"{address}\".");
+        [Command(15)]
+        // GetCurrentIpConfigInfo() -> (nn::nifm::IpAddressSetting, nn::nifm::DnsSetting)
+        public ResultCode GetCurrentIpConfigInfo(ServiceCtx context)
+        {
+            (IPInterfaceProperties interfaceProperties, UnicastIPAddressInformation unicastAddress) = GetLocalInterface();
+
+            if (interfaceProperties == null)
+            {
+                return ResultCode.NoInternetConnection;
+            }
+
+            Logger.PrintInfo(LogClass.ServiceNifm, $"Console's local IP is \"{unicastAddress.Address}\".");
+
+            context.ResponseData.WriteStruct(new IpAddressSetting(interfaceProperties, unicastAddress));
+            context.ResponseData.WriteStruct(new DnsSetting(interfaceProperties));
 
             return ResultCode.Success;
         }
@@ -108,6 +127,51 @@ namespace Ryujinx.HLE.HOS.Services.Nifm.StaticService
             return ResultCode.Success;
         }
 
+        private (IPInterfaceProperties, UnicastIPAddressInformation) GetLocalInterface()
+        {
+            if (!NetworkInterface.GetIsNetworkAvailable())
+            {
+                return (null, null);
+            }
+
+            IPInterfaceProperties       targetProperties  = null;
+            UnicastIPAddressInformation targetAddressInfo = null;
+
+            NetworkInterface[] interfaces = NetworkInterface.GetAllNetworkInterfaces();
+
+            foreach (NetworkInterface adapter in interfaces)
+            {
+                // Ignore loopback and non IPv4 capable interface.
+                if (adapter.NetworkInterfaceType != NetworkInterfaceType.Loopback && adapter.Supports(NetworkInterfaceComponent.IPv4))
+                {
+                    IPInterfaceProperties properties = adapter.GetIPProperties();
+
+                    if (properties.GatewayAddresses.Count > 0 && properties.DnsAddresses.Count > 1)
+                    {
+                        foreach (UnicastIPAddressInformation info in properties.UnicastAddresses)
+                        {
+                            // Only accept an IPv4 address
+                            if (info.Address.GetAddressBytes().Length == 4)
+                            {
+                                targetProperties  = properties;
+                                targetAddressInfo = info;
+
+                                break;
+                            }
+                        }
+                    }
+
+                    // Found the target interface, stop here.
+                    if (targetProperties != null)
+                    {
+                        break;
+                    }
+                }
+            }
+
+            return (targetProperties, targetAddressInfo);
+        }
+
         public void Dispose()
         {
             GeneralServiceManager.Remove(_generalServiceDetail.ClientId);

Ryujinx.HLE/HOS/Services/Nifm/StaticService/Types/DnsSetting.cs

@@ -0,0 +1,21 @@
+using System.Net.NetworkInformation;
+using System.Runtime.InteropServices;
+
+namespace Ryujinx.HLE.HOS.Services.Nifm.StaticService.Types
+{
+    [StructLayout(LayoutKind.Sequential, Pack = 1, Size = 9)]
+    struct DnsSetting
+    {
+        [MarshalAs(UnmanagedType.U1)]
+        public bool        IsDynamicDnsEnabled;
+        public IpV4Address PrimaryDns;
+        public IpV4Address SecondaryDns;
+
+        public DnsSetting(IPInterfaceProperties interfaceProperties)
+        {
+            IsDynamicDnsEnabled = interfaceProperties.IsDynamicDnsEnabled;
+            PrimaryDns          = new IpV4Address(interfaceProperties.DnsAddresses[0]);
+            SecondaryDns        = new IpV4Address(interfaceProperties.DnsAddresses[1]);
+        }
+    }
+}

Ryujinx.HLE/HOS/Services/Nifm/StaticService/Types/IpAddressSetting.cs

@@ -0,0 +1,23 @@
+using System.Net.NetworkInformation;
+using System.Runtime.InteropServices;
+
+namespace Ryujinx.HLE.HOS.Services.Nifm.StaticService.Types
+{
+    [StructLayout(LayoutKind.Sequential, Pack = 1, Size = 0xd)]
+    struct IpAddressSetting
+    {
+        [MarshalAs(UnmanagedType.U1)]
+        public bool        IsDhcpEnabled;
+        public IpV4Address Address;
+        public IpV4Address IPv4Mask;
+        public IpV4Address GatewayAddress;
+
+        public IpAddressSetting(IPInterfaceProperties interfaceProperties, UnicastIPAddressInformation unicastIPAddressInformation)
+        {
+            IsDhcpEnabled  = interfaceProperties.DhcpServerAddresses.Count != 0;
+            Address        = new IpV4Address(unicastIPAddressInformation.Address);
+            IPv4Mask       = new IpV4Address(unicastIPAddressInformation.IPv4Mask);
+            GatewayAddress = new IpV4Address(interfaceProperties.GatewayAddresses[0].Address);
+        }
+    }
+}

Ryujinx.HLE/HOS/Services/Nifm/StaticService/Types/IpV4Address.cs

@@ -0,0 +1,24 @@
+using System;
+using System.Net;
+using System.Runtime.InteropServices;
+
+namespace Ryujinx.HLE.HOS.Services.Nifm.StaticService.Types
+{
+    [StructLayout(LayoutKind.Sequential)]
+    struct IpV4Address
+    {
+        public uint Address;
+
+        public IpV4Address(IPAddress address)
+        {
+            if (address == null)
+            {
+                Address = 0;
+            }
+            else
+            {
+                Address = BitConverter.ToUInt32(address.GetAddressBytes());
+            }
+        }
+    }
+}