Expose server configuration via provider message

TunnelKit/Sources/Protocols/OpenVPN/AppExtension/OpenVPNTunnelProvider+Interaction.swift

@@ -51,6 +51,11 @@ extension OpenVPNTunnelProvider {
         /// Data is 16 bytes: low 8 = received, high 8 = sent.
         public static let dataCount = Message(0xfe)
         
+        /// Requests the configuration pulled from the server (if connected and available).
+        ///
+        /// Data is JSON (Decodable).
+        public static let serverConfiguration = Message(0xfd)
+
         /// The underlying raw message `Data` to forward to the tunnel via IPC.
         public let data: Data
         

TunnelKit/Sources/Protocols/OpenVPN/AppExtension/OpenVPNTunnelProvider.swift

@@ -277,6 +277,12 @@ open class OpenVPNTunnelProvider: NEPacketTunnelProvider {
                 response?.append(UInt64(dataCount.1)) // outbound
             }
             
+        case .serverConfiguration:
+            if let cfg = session?.serverConfiguration() {
+                let encoder = JSONEncoder()
+                response = try? encoder.encode(cfg)
+            }
+            
         default:
             break
         }

TunnelKit/Sources/Protocols/OpenVPN/OpenVPNSession.swift

@@ -308,6 +308,10 @@ public class OpenVPNSession: Session {
         return controlChannel.currentDataCount()
     }
     
+    public func serverConfiguration() -> OpenVPN.Configuration? {
+        return pushReply?.options
+    }
+    
     public func shutdown(error: Error?) {
         guard !isStopping else {
             log.warning("Ignore stop request, already stopping!")