Core/Realms: Minor refactor to realm address storage

Port From (https://github.com/TrinityCore/TrinityCore/commit/cc6dba1376905456062d1ade8adcbaed4f8f484e)

Source/BNetServer/Managers/LoginServiceManager.cs

@@ -120,9 +120,9 @@ namespace BNetServer
         public string GetHostnameForClient(IPEndPoint address)
         {
             if (IPAddress.IsLoopback(address.Address))
-                return _hostnames[0];
+                return _hostnames[1];
 
-            return _hostnames[1];
+            return _hostnames[0];
         }
 
         public int GetPort() { return _port; }

Source/Framework/Realm/Realm.cs

@@ -4,8 +4,8 @@
 using Framework.Constants;
 using Framework.Realm;
 using System;
+using System.Collections.Generic;
 using System.Net;
-using System.Net.Sockets;
 
 public class Realm : IEquatable<Realm>
 {
@@ -16,28 +16,13 @@ public class Realm : IEquatable<Realm>
         NormalizedName = NormalizedName.Replace(" ", "");
     }
 
-    public IPEndPoint GetAddressForClient(IPAddress clientAddr)
+    public IPAddress GetAddressForClient(IPAddress clientAddr)
     {
-        IPAddress realmIp = ExternalAddress;
-
         // Attempt to send best address for client
         if (IPAddress.IsLoopback(clientAddr))
-        {
-            // Try guessing if realm is also connected locally
-            if (IPAddress.IsLoopback(LocalAddress) || IPAddress.IsLoopback(ExternalAddress))
-                realmIp = clientAddr;
-            else
-            {
-                // Assume that user connecting from the machine that authserver is located on
-                // has all realms available in his local network
-                realmIp = LocalAddress;
-            }
-        }
+            return Addresses[1];
 
-        IPEndPoint endpoint = new(realmIp, Port);
-
-        // Return external IP
-        return endpoint;
+        return Addresses[0];
     }
 
     public uint GetConfigId()
@@ -57,9 +42,7 @@ public class Realm : IEquatable<Realm>
 
     public bool Equals(Realm other)
     {
-        return other.ExternalAddress.Equals(ExternalAddress)
-            && other.LocalAddress.Equals(LocalAddress)
-            && other.Port == Port
+        return other.Port == Port
             && other.Name == Name
             && other.Type == Type
             && other.Flags == Flags
@@ -70,13 +53,12 @@ public class Realm : IEquatable<Realm>
 
     public override int GetHashCode()
     {
-        return new { ExternalAddress, LocalAddress, Port, Name, Type, Flags, Timezone, AllowedSecurityLevel, PopulationLevel }.GetHashCode();
+        return new { Port, Name, Type, Flags, Timezone, AllowedSecurityLevel, PopulationLevel }.GetHashCode();
     }
 
     public RealmId Id;
     public uint Build;
-    public IPAddress ExternalAddress;
-    public IPAddress LocalAddress;
+    public List<IPAddress> Addresses = new();
     public ushort Port;
     public string Name;
     public string NormalizedName;

Source/Framework/Realm/RealmManager.cs

@@ -92,8 +92,8 @@ public class RealmManager : Singleton<RealmManager>
                 var realm = new Realm();
                 uint realmId = result.Read<uint>(0);
                 realm.Name = result.Read<string>(1);
-                realm.ExternalAddress = IPAddress.Parse(result.Read<string>(2));
-                realm.LocalAddress = IPAddress.Parse(result.Read<string>(3));
+                realm.Addresses.Add(IPAddress.Parse(result.Read<string>(2)));
+                realm.Addresses.Add(IPAddress.Parse(result.Read<string>(3)));
                 realm.Port = result.Read<ushort>(4);
                 RealmType realmType = (RealmType)result.Read<byte>(5);
                 if (realmType == RealmType.FFAPVP)
@@ -120,9 +120,9 @@ public class RealmManager : Singleton<RealmManager>
                     _subRegions.Add(subRegion);
 
                 if (!existingRealms.ContainsKey(realm.Id))
-                    Log.outInfo(LogFilter.Realmlist, "Added realm \"{0}\" at {1}:{2}", realm.Name, realm.ExternalAddress.ToString(), realm.Port);
+                    Log.outInfo(LogFilter.Realmlist, "Added realm \"{0}\" at {1}:{2}", realm.Name, realm.Addresses[0].ToString(), realm.Port);
                 else
-                    Log.outDebug(LogFilter.Realmlist, "Updating realm \"{0}\" at {1}:{2}", realm.Name, realm.ExternalAddress.ToString(), realm.Port);
+                    Log.outDebug(LogFilter.Realmlist, "Updating realm \"{0}\" at {1}:{2}", realm.Name, realm.Addresses[0].ToString(), realm.Port);
 
                 existingRealms.Remove(realm.Id);
             }

Source/Game/Server/WorldSession.cs

@@ -490,12 +490,12 @@ namespace Game
 
             if (instanceAddress.AddressFamily == System.Net.Sockets.AddressFamily.InterNetwork)
             {
-                connectTo.Payload.Where.IPv4 = instanceAddress.Address.GetAddressBytes();
+                connectTo.Payload.Where.IPv4 = instanceAddress.GetAddressBytes();
                 connectTo.Payload.Where.Type = ConnectTo.AddressType.IPv4;
             }
             else
             {
-                connectTo.Payload.Where.IPv6 = instanceAddress.Address.GetAddressBytes();
+                connectTo.Payload.Where.IPv6 = instanceAddress.GetAddressBytes();
                 connectTo.Payload.Where.Type = ConnectTo.AddressType.IPv6;
             }
 

Source/Game/World/WorldManager.cs

@@ -2443,8 +2443,8 @@ namespace Game
                 return false;
 
             _realm.SetName(result.Read<string>(1));
-            _realm.ExternalAddress = System.Net.IPAddress.Parse(result.Read<string>(2));
-            _realm.LocalAddress = System.Net.IPAddress.Parse(result.Read<string>(3));
+            _realm.Addresses.Add(System.Net.IPAddress.Parse(result.Read<string>(2)));
+            _realm.Addresses.Add(System.Net.IPAddress.Parse(result.Read<string>(3)));
             _realm.Port = result.Read<ushort>(4);
             _realm.Type = result.Read<byte>(5);
             _realm.Flags = (RealmFlags)result.Read<byte>(6);