Allow LAN connections when NAT Loopback is not supported

Fika.Core/Coop/Matchmaker/MatchmakerAccept/MatchmakerAcceptPatches.cs

@@ -30,6 +30,8 @@ public static class MatchmakerAcceptPatches
         public static MatchMakerGroupPreview MatchMakerGroupPreview { get; set; }
         public static int HostExpectedNumberOfPlayers { get; set; } = 1;
         public static WeatherClass[] Nodes { get; set; } = null;
+        public static string RemoteIp;
+        public static int RemotePort;
         private static string groupId;
         private static long timestamp;
         #endregion

Fika.Core/Networking/FikaClient.cs

@@ -50,8 +50,8 @@ public NetManager NetClient
             }
         }
         public NetPeer ServerConnection { get; private set; }
-        public string IP { get; private set; }
-        public int Port { get; private set; }
+        /*public string IP { get; private set; }
+        public int Port { get; private set; }*/
         public bool SpawnPointsReceived { get; private set; } = false;
         private readonly ManualLogSource clientLogger = BepInEx.Logging.Logger.CreateLogSource("Fika.Client");
 
@@ -94,19 +94,22 @@ public void Init()
 
             _netClient.Start();
 
-            GetHostRequest body = new(MatchmakerAcceptPatches.GetGroupId());
+            /*GetHostRequest body = new(MatchmakerAcceptPatches.GetGroupId());
             GetHostResponse result = FikaRequestHandler.GetHost(body);
 
             IP = result.Ip;
-            Port = result.Port;
+            Port = result.Port;*/
 
-            if (string.IsNullOrEmpty(IP))
+            string ip = MatchmakerAcceptPatches.RemoteIp;
+            int port = MatchmakerAcceptPatches.RemotePort;
+
+            if (string.IsNullOrEmpty(ip))
             {
                 Singleton<PreloaderUI>.Instance.ShowErrorScreen("Network Error", "Unable to connect to the raid server. IP and/or Port was empty when requesting data!");
             }
             else
             {
-                ServerConnection = _netClient.Connect(IP, Port, "fika.core");
+                ServerConnection = _netClient.Connect(ip, port, "fika.core");
             };
 
             FikaEventDispatcher.DispatchEvent(new FikaClientCreatedEvent(this));

Fika.Core/Networking/FikaPingingClient.cs

@@ -1,4 +1,6 @@
 using BepInEx.Logging;
+using EFT.UI;
+using Fika.Core.Coop.Matchmaker;
 using Fika.Core.Networking.Http;
 using Fika.Core.Networking.Http.Models;
 using LiteNetLib;
@@ -14,6 +16,7 @@ internal class FikaPingingClient(string serverId) : INetEventListener
         private readonly ManualLogSource _logger = Logger.CreateLogSource("Fika.PingingClient");
         private readonly string serverId = serverId;
         private IPEndPoint remoteEndPoint;
+        private IPEndPoint localEndPoint;
         public bool Received = false;
 
         public bool Init()
@@ -26,7 +29,12 @@ public bool Init()
             GetHostRequest body = new(serverId);
             GetHostResponse result = FikaRequestHandler.GetHost(body);
 
-            string ip = result.Ip;
+            string ip = result.Ips[0];
+            string localIp = null;
+            if (result.Ips.Length > 1)
+            {
+                localIp = result.Ips[1];
+            }
             int port = result.Port;
 
             if (string.IsNullOrEmpty(ip))
@@ -42,23 +50,31 @@ public bool Init()
             }
 
             remoteEndPoint = new(IPAddress.Parse(ip), port);
+            if (!string.IsNullOrEmpty(localIp))
+            {
+                localEndPoint = new(IPAddress.Parse(localIp), port); 
+            }
 
             NetClient.Start();
 
             return true;
         }
 
-        public bool PingEndPoint()
+        public void PingEndPoint()
         {
             if (Received)
             {
-                return true;
+                return;
             }
 
             NetDataWriter writer = new();
             writer.Put("fika.hello");
 
-            return NetClient.SendUnconnectedMessage(writer, remoteEndPoint);
+            NetClient.SendUnconnectedMessage(writer, remoteEndPoint);
+            if (localEndPoint != null)
+            {
+                NetClient.SendUnconnectedMessage(writer, localEndPoint); 
+            }
         }
 
         public void OnConnectionRequest(ConnectionRequest request)
@@ -94,6 +110,8 @@ public void OnNetworkReceiveUnconnected(IPEndPoint remoteEndPoint, NetPacketRead
                 if (result == "fika.hello")
                 {
                     Received = true;
+                    MatchmakerAcceptPatches.RemoteIp = remoteEndPoint.Address.ToString();
+                    MatchmakerAcceptPatches.RemotePort = remoteEndPoint.Port;
                 }
                 else
                 {

Fika.Core/Networking/FikaServer.cs

@@ -152,7 +152,24 @@ public async Task Init()
             NotificationManagerClass.DisplayMessageNotification($"Server started on port {_netServer.LocalPort}.",
                 EFT.Communications.ENotificationDurationType.Default, EFT.Communications.ENotificationIconType.EntryPoint);
 
-            SetHostRequest body = new(MyExternalIP, Port);
+            string[] Ips = [];
+
+            foreach (string ip in FikaPlugin.Instance.LocalIPs)
+            {
+                if (ip.StartsWith("192.168")) // need to add more cases here later, for now only check normal range...
+                {
+                    Ips = [MyExternalIP, ip];
+                }
+            }
+
+            if (Ips.Length < 1)
+            {
+                Ips = [MyExternalIP, ""];
+                NotificationManagerClass.DisplayMessageNotification("Could not find a valid local IP!",
+                iconType: EFT.Communications.ENotificationIconType.Alert);
+            }
+
+            SetHostRequest body = new(Ips, Port);
             FikaRequestHandler.UpdateSetHost(body);
 
             FikaEventDispatcher.DispatchEvent(new FikaServerCreatedEvent(this));

Fika.Core/Networking/Models/GetHostResponse.cs

@@ -1,19 +1,20 @@
+using System.Collections.Generic;
 using System.Runtime.Serialization;
 
 namespace Fika.Core.Networking.Http.Models
 {
     [DataContract]
     public struct GetHostResponse
     {
-        [DataMember(Name = "ip")]
-        public string Ip;
+        [DataMember(Name = "ips")]
+        public string[] Ips;
 
         [DataMember(Name = "port")]
         public int Port;
 
-        public GetHostResponse(string ip, int port)
+        public GetHostResponse(string[] ips, int port)
         {
-            Ip = ip;
+            Ips = ips;
             Port = port;
         }
     }

Fika.Core/Networking/Models/SetHostRequest.cs

@@ -1,4 +1,5 @@
 using Fika.Core.Coop.Components;
+using System.Collections.Generic;
 using System.Runtime.Serialization;
 
 namespace Fika.Core.Networking.Http.Models
@@ -9,16 +10,16 @@ public struct SetHostRequest
         [DataMember(Name = "serverId")]
         public string ServerId;
 
-        [DataMember(Name = "ip")]
-        public string Ip;
+        [DataMember(Name = "ips")]
+        public string[] Ips;
 
         [DataMember(Name = "port")]
         public int Port;
 
-        public SetHostRequest(string ip, int port)
+        public SetHostRequest(string[] ips, int port)
         {
             ServerId = CoopHandler.GetServerId();
-            Ip = ip;
+            Ips = ips;
             Port = port;
         }
     }