Shut down abruptly to work around macOS bug

Fixes #111

CHANGELOG.md

@@ -5,6 +5,12 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## Unreleased
+
+### Fixed
+
+- Tunnel dies unexpectedly on macOS. [#111](https://github.com/passepartoutvpn/tunnelkit/issues/111)
+
 ## 1.7.1 (2019-05-14)
 
 ### Added

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

@@ -241,6 +241,7 @@ open class OpenVPNTunnelProvider: NEPacketTunnelProvider {
         guard let session = session else {
             flushLog()
             completionHandler()
+            forceExitOnMac()
             return
         }
 
@@ -255,6 +256,7 @@ open class OpenVPNTunnelProvider: NEPacketTunnelProvider {
             log.warning("Tunnel not responding after \(weakSelf.shutdownTimeout) milliseconds, forcing stop")
             weakSelf.flushLog()
             pendingHandler()
+            self?.forceExitOnMac()
         }
         tunnelQueue.sync {
             session.shutdown(error: nil)
@@ -333,7 +335,7 @@ open class OpenVPNTunnelProvider: NEPacketTunnelProvider {
         flushLog()
 
         // failed to start
-        if (pendingStartHandler != nil) {
+        if pendingStartHandler != nil {
 
             //
             // CAUTION
@@ -355,13 +357,15 @@ open class OpenVPNTunnelProvider: NEPacketTunnelProvider {
             pendingStartHandler = nil
         }
         // stopped intentionally
-        else if (pendingStopHandler != nil) {
+        else if pendingStopHandler != nil {
             pendingStopHandler?()
             pendingStopHandler = nil
+            forceExitOnMac()
         }
         // stopped externally, unrecoverable
         else {
             cancelTunnelWithError(error)
+            forceExitOnMac()
         }
     }
 
@@ -843,3 +847,11 @@ private extension Proxy {
         return NEProxyServer(address: address, port: Int(port))
     }
 }
+
+private extension NEPacketTunnelProvider {
+    func forceExitOnMac() {
+        #if os(macOS)
+        exit(0)
+        #endif
+    }
+}