fix ip resolving for Connect method (IPv4 and IPv6 conflict)

Author: RevenantX

LiteNetLib/NetClient.cs

@@ -105,7 +105,7 @@ protected override void ProcessError(string errorMessage)
         public void Connect(string address, int port)
         {
             //Create target endpoint
-            NetEndPoint ep = new NetEndPoint(address, port);
+            NetEndPoint ep = new NetEndPoint(address, port, AddressType);
             Connect(ep);
         }
 

LiteNetLib/NetEndPoint.cs

@@ -55,15 +55,10 @@ public NetEndPoint(string hostStr, int port)
             IPAddress ipAddress;
             if (!IPAddress.TryParse(hostStr, out ipAddress))
             {
-                IPHostEntry host = Dns.GetHostEntry(hostStr);
-                foreach (IPAddress ip in host.AddressList)
+                ipAddress = ResolveAddress(hostStr, AddressFamily.InterNetworkV6);
+                if (ipAddress == null)
                 {
-                    if (ip.AddressFamily == AddressFamily.InterNetwork || 
-                        ip.AddressFamily == AddressFamily.InterNetworkV6)
-                    {
-                        ipAddress = ip;
-                        break;
-                    }
+                    ipAddress = ResolveAddress(hostStr, AddressFamily.InterNetwork);
                 }
             }
             if (ipAddress == null)
@@ -73,6 +68,36 @@ public NetEndPoint(string hostStr, int port)
             EndPoint = new IPEndPoint(ipAddress, port);
         }
 
+        private IPAddress ResolveAddress(string hostStr, AddressFamily addressFamily)
+        {
+            IPHostEntry host = Dns.GetHostEntry(hostStr);
+            foreach (IPAddress ip in host.AddressList)
+            {
+                if (ip.AddressFamily == addressFamily)
+                {
+                    return ip;
+                }
+            }
+            return null;
+        }
+
+        public NetEndPoint(string hostStr, int port, ConnectionAddressType addressType)
+        {
+            IPAddress ipAddress;
+            if (!IPAddress.TryParse(hostStr, out ipAddress))
+            {
+                ipAddress = ResolveAddress(hostStr,
+                    addressType == ConnectionAddressType.IPv4
+                        ? AddressFamily.InterNetwork
+                        : AddressFamily.InterNetworkV6);
+            }
+            if (ipAddress == null)
+            {
+                throw new Exception("Invalid address: " + hostStr);
+            }
+            EndPoint = new IPEndPoint(ipAddress, port);
+        }
+
         internal long GetId()
         {
             byte[] addr = EndPoint.Address.GetAddressBytes();

LiteNetLib/NtpSyncModule.cs

@@ -10,11 +10,11 @@ public class NtpSyncModule
 
         public NtpSyncModule(string ntpServer)
         {
-            _socket = new NetSocket(ConnectionAddressType.IPv4);
-            NetEndPoint ourEndPoint = new NetEndPoint(ConnectionAddressType.IPv4, 0);
+            _ntpEndPoint = new NetEndPoint(ntpServer, 123);
+            _socket = new NetSocket(_ntpEndPoint.AddressType);
+            NetEndPoint ourEndPoint = new NetEndPoint(_ntpEndPoint.AddressType, 0);
             _socket.Bind(ref ourEndPoint);
             _socket.ReceiveTimeout = 3000;
-            _ntpEndPoint = new NetEndPoint(ntpServer, 123);
             SyncedTime = null;
         }
 

LiteNetLibWin81/NetEndPoint.cs

@@ -102,6 +102,11 @@ public NetEndPoint(string hostName, int port)
             PortStr = port.ToString();
         }
 
+        public NetEndPoint(string hostName, int port, ConnectionAddressType addressType) : this(hostName, port)
+        {
+            
+        }
+
         internal NetEndPoint(HostName hostName, string port)
         {
             HostName = hostName;