Create Personal VPN connection using NEVPNManager

Question

I am trying to create VPN connection in my app. I go through this link https://developer.apple.com/documentation/networkextension/nevpnmanager but did not find any official code to use NEVPNManager and even not found any tutorial to use this NEVPNManager.

I am new to VPN concept and don't know that much about it. so Can anyone give some solutions?

Answer 1

This tutorial help me to create VPN connection.

http://blog.moatazthenervous.com/create-a-vpn-connection-with-apple-swift/

VPN file for connection and disconnection

import Foundation
import NetworkExtension

  // MARK: - NEVPNManager
    // MARK: -


    private var vpnLoadHandler: (Error?) -> Void { return
    { (error:Error?) in
        if ((error) != nil) {
            print("Could not load VPN Configurations")
            self.removeToast()
            return;
        }

        self.showToast(msg: STRINGVALUES.kCreatingConnection)


        //VPN connection via Username password
        let p = NEVPNProtocolIPSec()
        let kcs = KeychainService()
        p.authenticationMethod = NEVPNIKEAuthenticationMethod.sharedSecret

        //For the security purpose added word xyz in password .so it should be remove while connecting


        if self.selectedSever != nil{
            self.selectedSever?.password = (self.selectedSever?.password.replacingOccurrences(of: "xyz", with: ""))!
            p.username = self.selectedSever?.userName
            p.serverAddress = self.selectedSever?.serverAddress
            kcs.save(key: "SHARED", value: (self.selectedSever?.password)!)

            kcs.save(key: "VPN_PASSWORD", value: (self.selectedSever?.password)!)
            p.sharedSecretReference = kcs.load(key: STRINGVALUES.kShared)
            p.passwordReference = kcs.load(key: STRINGVALUES.kVPN_Pswd)
            p.useExtendedAuthentication = true
            p.disconnectOnSleep = false

            // Check for free subscriber
            if self.selectedSever?.serverType == STRINGVALUES.VIP.lowercased() && !Singleton.checkForPaidReciept(){

                self.disconnectVPN()
                Helper.showAlert(sender: self, title: STRINGVALUES.AppName, message: AlertMessage.kValidateSubscription)
                return

            }


            self.vpnManager.protocolConfiguration = p
            self.vpnManager.localizedDescription = STRINGVALUES.AppName
            self.vpnManager.isEnabled = true

            self.vpnManager.saveToPreferences(completionHandler: self.vpnSaveHandler)
        }else{

        }


        }

    }


    private var vpnSaveHandler: (Error?) -> Void { return
    { (error:Error?) in
        if (error != nil) {
            print("Could not save VPN Configurations")
            self.removeToast()
            return
        } else {
            do {
                try self.vpnManager.connection.startVPNTunnel()
            } catch let error {
                print("Error starting VPN Connection \(error.localizedDescription)");
                self.removeToast()
            }
        }
        }
        //self.vpnlock = false
    }



    public func connectVPN() {
        //For no known reason the process of saving/loading the VPN configurations fails.On the 2nd time it works
        do {
            try self.vpnManager.loadFromPreferences(completionHandler: self.vpnLoadHandler)

        } catch let error {
            print("Could not start VPN Connection: \(error.localizedDescription)" )
            self.removeToast()
        }
    }

    public func disconnectVPN() ->Void {
        vpnManager.connection.stopVPNTunnel()


    }

    func vpnConnectionStatusChanged(){

       let status = self.vpnManager.connection.status
        print("VPN connection status = \(status)")

        switch status {
        case NEVPNStatus.connected:

            showToast(msg: STRINGVALUES.kConnected)




        case NEVPNStatus.invalid, NEVPNStatus.disconnected :

            showToast(msg: STRINGVALUES.kDisconnected)


        case NEVPNStatus.connecting , NEVPNStatus.reasserting:

            showToast(msg: STRINGVALUES.kConnecting)


        case NEVPNStatus.disconnecting:
            showToast(msg: STRINGVALUES.kDisconnecting)

        default:
            print("Unknown VPN connection status")
        }

    }