Refactored code, cover more private IP address ranges

src/main/resources/application.conf

@@ -1,12 +1,14 @@
 # The socket bind address for all net.psforever.services except admin. 127.0.0.1 is the
-# default for local testing, for public servers use 0.0.0.0 instead.
+# default for local testing, for LAN or public servers use 0.0.0.0 instead.
 bind = 127.0.0.1
 
-# The public host name or IP address. Used to forward clients from the login
-# server to the world server. The default value will only allow local connections.
-# If you encounter issues trying to connect to the world from other machines on the same network
-# when this is not the default value and you have a router that lacks Hairpin NAT support, make sure
-# the hosts file on this system has the host name of the system set to resolve to it's local IP address on the network.
+# The private host name or IP address. Used to forward clients on the local network
+# from the login server to the world server. The default value will only allow connections from the host machine,
+# set this to the host machines private address on the local network to allow connections from other machines on it.
+local = 127.0.0.1
+
+# The public host name or IP address. Used to forward external clients from outside the local network
+# from the login server to the world server. The default value will not allow external connections.
 public = 127.0.0.1
 
 # Login server configuration

src/main/scala/net/psforever/actors/net/LoginActor.scala

@@ -33,6 +33,10 @@ object LoginActor {
 
   final case class ReceptionistListing(listing: Receptionist.Listing) extends Command
 
+  private val gameTestServerAddressLocal = new InetSocketAddress(InetAddress.getByName(Config.app.local), Config.app.world.port)
+  private val gameTestServerAddressPublic = new InetSocketAddress(InetAddress.getByName(Config.app.public), Config.app.world.port)
+  private val localHostAddress = new InetSocketAddress("127.0.0.1", Config.app.world.port)
+
   /**
    * What does a token do?
    * No one knows.
@@ -78,6 +82,21 @@ object LoginActor {
     //remove color codes from the server name - look for '\\#' followed by six characters or numbers
     name.replaceAll("\\\\#[\\da-fA-F]{6}","")
   }
+
+  /**
+   * Selects the appropriate host address for transfer to world server.
+   * This is a workaround for cases of local connections not working
+   * properly when using a router that lacks Hairpin NAT support.
+   * @param ipAddress the IP address of the connecting client in string form
+   * @return the appropriate host address
+   */
+  private def selectHostAddress(ipAddress: String): InetSocketAddress = {
+    ipAddress.substring(0, ipAddress.indexOf(".")) match {
+      case "127"                        => localHostAddress
+      case "10" | "169" | "172" | "192" => gameTestServerAddressLocal
+      case _                            => gameTestServerAddressPublic
+    }
+  }
 }
 
 class LoginActor(middlewareActor: typed.ActorRef[MiddlewareActor.Command], connectionId: String, sessionId: Long)
@@ -96,8 +115,6 @@ class LoginActor(middlewareActor: typed.ActorRef[MiddlewareActor.Command], conne
   private var port: Int                 = 0
 
   private val serverName: String = Config.app.world.serverName
-  private val gameTestServerAddress = new InetSocketAddress(InetAddress.getByName(Config.app.public), Config.app.world.port)
-  private val localHost: InetAddress = InetAddress.getLocalHost
 
   private val bcryptRounds = 12
 
@@ -153,8 +170,7 @@ class LoginActor(middlewareActor: typed.ActorRef[MiddlewareActor.Command], conne
       updateServerList()
 
     case SocketPane.NextPort(_, _, portNum) =>
-      val address = if (ipAddress == "127.0.0.1") ipAddress else if (ipAddress.startsWith("192.168")) localHost.getHostAddress else gameTestServerAddress.getAddress.getHostAddress
-      log.info(s"Connecting to ${address.toLowerCase}: $portNum ...")
+      val address = LoginActor.selectHostAddress(ipAddress).getAddress.getHostAddress
       val response = ConnectToWorldMessage(serverName, address, portNum)
       context.become(idlingBehavior)
       middlewareActor ! MiddlewareActor.Send(response)
@@ -166,7 +182,7 @@ class LoginActor(middlewareActor: typed.ActorRef[MiddlewareActor.Command], conne
 
   private def waitingForServerTransferBehavior: Receive = persistentSetupMixinBehavior.orElse {
     case SocketPane.NextPort(_, _, portNum) =>
-      val address = if (ipAddress == "127.0.0.1") ipAddress else if (ipAddress.startsWith("192.168")) localHost.getHostAddress else gameTestServerAddress.getAddress.getHostAddress
+      val address = LoginActor.selectHostAddress(ipAddress).getAddress.getHostAddress
       log.info(s"Connecting to ${address.toLowerCase}: $portNum ...")
       val response = ConnectToWorldMessage(serverName, address, portNum)
       context.become(idlingBehavior)
@@ -499,7 +515,7 @@ class LoginActor(middlewareActor: typed.ActorRef[MiddlewareActor.Command], conne
             serverName,
             WorldStatus.Up,
             Config.app.world.serverType,
-            Vector(WorldConnectionInfo(gameTestServerAddress)), //todo ideally, ask for info from SocketPane
+            Vector(WorldConnectionInfo(LoginActor.selectHostAddress(ipAddress))), //todo ideally, ask for info from SocketPane
             PlanetSideEmpire.VS
           )
         )

src/main/scala/net/psforever/util/Config.scala

@@ -84,6 +84,7 @@ object Config {
 
 case class AppConfig(
     bind: String,
+    local: String,
     public: String,
     login: LoginConfig,
     world: WorldConfig,