VPN in Swift - loadFromPreferences not running handler - swift

Question

I am trying to connect programmatically to a VPN. I got the code below on this website: http://blog.moatazthenervous.com/create-a-vpn-connection-with-apple-swift/
I am trying to develop a command line application for macOS to connect programatically to a VPN.
import Foundation
import NetworkExtension
class VPN {
let vpnManager = NEVPNManager.shared();
let userName: String;
let passString: String;
let secret: String;
let server: String;
init (_ user: String, _ pass: String, _ secret: String, _ server: String){
userName = user
passString = pass
self.secret = secret
self.server = server
}
private var vpnLoadHandler: (Error?) -> Void { return
{ (error:Error?) in
if ((error) != nil) {
print("Could not load VPN Configurations")
return;
}
print ("me! me! ")
let p = NEVPNProtocolIPSec()
p.username = self.userName
p.serverAddress = self.server
p.authenticationMethod = NEVPNIKEAuthenticationMethod.sharedSecret
let kcs = KeychainService();
kcs.save(key: "SHARED", value: self.secret )
kcs.save(key: "VPN_PASSWORD", value: self.passString)
p.sharedSecretReference = kcs.load(key: "SHARED")
p.passwordReference = kcs.load(key: "VPN_PASSWORD")
p.useExtendedAuthentication = true
p.disconnectOnSleep = false
p.localIdentifier = "uio"
self.vpnManager.protocolConfiguration = p
self.vpnManager.localizedDescription = "Contensi"
self.vpnManager.isEnabled = true
self.vpnManager.saveToPreferences(completionHandler: self.vpnSaveHandler)
} }
private var vpnSaveHandler: (Error?) -> Void { return
{ (error:Error?) in
if (error != nil) {
print("Could not save VPN Configurations")
return
} else {
do {
try self.vpnManager.connection.startVPNTunnel()
} catch let error {
print("Error starting VPN Connection \(error.localizedDescription)");
}
}
}
}
public func connectVPN() {
//For no known reason the process of saving/loading the VPN configurations fails.On the 2nd time it works
do {
self.vpnManager.loadFromPreferences(completionHandler: self.vpnLoadHandler)
// self.vpnManager.saveToPreferences(completionHandler: nil)
}
}
public func disconnectVPN() ->Void {
self.vpnManager.connection.stopVPNTunnel()
}
public func status() -> NEVPNStatus {
return vpnManager.connection.status
}
}
My problem is that I my completion handlers are not working. Take the function connectVPN(), for instance. It's completion handler is vpnLoadHandler. However, I never get that handler executed. See the print statement on the handler? Nothing ever gets printed.
Reading Apple's documentation, I know that I have to configure XCode with an entitlement in order to allow VPN - I haven't got the "capabilities"-tab, so I don't know how to add that entitlement. I am not sure if that's the problem, since the app compiles file and executes. I just don't get the completion handler to execute.
So, basically:
why isn't the handler being called? And what can I do to debug?
Could this be due the lack an entitlement to allow the configuration of a personal vpn in xcode? If so, how can I configure that?
Best,
Francis
UPDATE I actually managed to create the entitlements file, and I guess it has the proper settings to allow a personal vpn. So I guess that part is solved. But why isn't the completion handler called?