feat: Add support for connecting via a hostname instead of IP

com.unity.netcode.gameobjects/CHANGELOG.md

@@ -10,6 +10,7 @@ Additional documentation and release notes are available at [Multiplayer Documen
 
 ### Added
 
+- When using UnityTransport >=2.4 and Unity >= 6000.1.0a1, SetConnectionData will accept a fully qualified hostname instead of an IP as a connect address on the client side. (#3441)
 
 ### Fixed
 

com.unity.netcode.gameobjects/Runtime/Transports/UTP/UnityTransport.cs

@@ -256,10 +256,7 @@ private static NetworkEndpoint ParseNetworkEndpoint(string ip, ushort port, bool
                 if (!NetworkEndpoint.TryParse(ip, port, out endpoint, NetworkFamily.Ipv4) &&
                     !NetworkEndpoint.TryParse(ip, port, out endpoint, NetworkFamily.Ipv6))
                 {
-                    if (!silent)
-                    {
-                        Debug.LogError($"Invalid network endpoint: {ip}:{port}.");
-                    }
+                    return default;
                 }
 
                 return endpoint;
@@ -512,8 +509,15 @@ private bool ClientBindAndConnect()
             // Verify the endpoint is valid before proceeding
             if (serverEndpoint.Family == NetworkFamily.Invalid)
             {
+#if HOSTNAME_RESOLUTION_AVAILABLE && UTP_TRANSPORT_2_4_ABOVE
+                // If it's not valid, try to treat it like a URL.
+                InitDriver();
+                m_Driver.Connect(ConnectionData.Address, ConnectionData.Port);
+                return true;
+#else
                 Debug.LogError($"Target server network address ({ConnectionData.Address}) is {nameof(NetworkFamily.Invalid)}!");
                 return false;
+#endif
             }
 
             InitDriver();
@@ -625,7 +629,7 @@ public void SetClientRelayData(string ipAddress, ushort port, byte[] allocationI
         /// <summary>
         /// Sets IP and Port information. This will be ignored if using the Unity Relay and you should call <see cref="SetRelayServerData"/>
         /// </summary>
-        /// <param name="ipv4Address">The remote IP address (despite the name, can be an IPv6 address)</param>
+        /// <param name="ipv4Address">The remote IP address (despite the name, can be an IPv6 address or a domain name)</param>
         /// <param name="port">The remote port</param>
         /// <param name="listenAddress">The local listen address</param>
         public void SetConnectionData(string ipv4Address, ushort port, string listenAddress = null)

com.unity.netcode.gameobjects/Runtime/com.unity.netcode.runtime.asmdef

@@ -67,6 +67,16 @@
             "name": "Unity",
             "expression": "6000.0.11f1",
             "define": "COM_UNITY_MODULES_PHYSICS2D_LINEAR"
+        },
+        {
+            "name": "com.unity.transport",
+            "expression": "2.4.0",
+            "define": "UTP_TRANSPORT_2_4_ABOVE"
+        },
+        {
+            "name": "Unity",
+            "expression": "6000.1.0a1",
+            "define": "HOSTNAME_RESOLUTION_AVAILABLE"
         }
     ],
     "noEngineReferences": false

com.unity.netcode.gameobjects/Tests/Editor/Transports/UnityTransportTests.cs

@@ -131,7 +131,6 @@ public void UnityTransport_RestartSucceedsAfterFailure()
 
             Assert.False(transport.StartServer());
 
-            LogAssert.Expect(LogType.Error, "Invalid network endpoint: 127.0.0.:4242.");
             LogAssert.Expect(LogType.Error, "Network listen address (127.0.0.) is Invalid!");
 
             transport.SetConnectionData("127.0.0.1", 4242, "127.0.0.1");
@@ -153,22 +152,6 @@ public void UnityTransport_StartServerWithoutAddresses()
             transport.Shutdown();
         }
 
-        // Check that StartClient returns false with bad connection data.
-        [Test]
-        public void UnityTransport_StartClientFailsWithBadAddress()
-        {
-            UnityTransport transport = new GameObject().AddComponent<UnityTransport>();
-            transport.Initialize();
-
-            transport.SetConnectionData("foobar", 4242);
-            Assert.False(transport.StartClient());
-
-            LogAssert.Expect(LogType.Error, "Invalid network endpoint: foobar:4242.");
-            LogAssert.Expect(LogType.Error, "Target server network address (foobar) is Invalid!");
-
-            transport.Shutdown();
-        }
-
         [Test]
         public void UnityTransport_EmptySecurityStringsShouldThrow([Values("", null)] string cert, [Values("", null)] string secret)
         {

com.unity.netcode.gameobjects/Tests/Runtime/Transports/UnityTransportConnectionTests.cs

@@ -46,23 +46,6 @@ public IEnumerator Cleanup()
             yield return null;
         }
 
-        // Check that invalid endpoint addresses are detected and return false if detected
-        [Test]
-        public void DetectInvalidEndpoint()
-        {
-            using var netcodeLogAssert = new NetcodeLogAssert(true);
-            InitializeTransport(out m_Server, out m_ServerEvents);
-            InitializeTransport(out m_Clients[0], out m_ClientsEvents[0]);
-            m_Server.ConnectionData.Address = "Fubar";
-            m_Server.ConnectionData.ServerListenAddress = "Fubar";
-            m_Clients[0].ConnectionData.Address = "MoreFubar";
-            Assert.False(m_Server.StartServer(), "Server failed to detect invalid endpoint!");
-            Assert.False(m_Clients[0].StartClient(), "Client failed to detect invalid endpoint!");
-            netcodeLogAssert.LogWasReceived(LogType.Error, $"Network listen address ({m_Server.ConnectionData.Address}) is Invalid!");
-            netcodeLogAssert.LogWasReceived(LogType.Error, $"Target server network address ({m_Clients[0].ConnectionData.Address}) is Invalid!");
-            UnityTransportTestComponent.CleanUp();
-        }
-
         // Check connection with a single client.
         [UnityTest]
         public IEnumerator ConnectSingleClient()