Improve logging of ConnectionStrategy

CHANGELOG.md

@@ -5,6 +5,10 @@ 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).
 
+## 2.2.7 (2020-06-11)
+
+- Code cleanup.
+
 ## 2.2.6 (2020-05-12)
 
 - Address concerns from Guido Vranken fuzzers. [#141](https://github.com/passepartoutvpn/tunnelkit/pull/141)

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

@@ -84,17 +84,20 @@ class ConnectionStrategy {
         currentEndpointIndex = 0
         if let resolvedAddresses = configuration.resolvedAddresses {
             if configuration.prefersResolvedAddresses {
+                log.debug("Will use pre-resolved addresses only")
                 endpoints = ConnectionStrategy.unrolledEndpoints(
                     records: resolvedAddresses.map { DNSRecord(address: $0, isIPv6: false) },
                     protos: endpointProtocols
                 )
             } else {
+                log.debug("Will use DNS resolution with fallback to pre-resolved addresses")
                 endpoints = []
             }
             self.resolvedAddresses = resolvedAddresses
         } else {
+            log.debug("Will use DNS resolution")
             guard hostname != nil else {
-                fatalError("Either configuration.hostname or resolvedRecords required")
+                fatalError("Either configuration.sessionConfiguration.hostname or configuration.resolvedAddresses required")
             }
             endpoints = []
             resolvedAddresses = []