WireGuard add extra source files

Signed-off-by: Joseph Mattello <mail@joemattiello.com>

WireguardNetworkExtension/Logging/Logger.swift

@@ -0,0 +1,65 @@
+// SPDX-License-Identifier: MIT
+// Copyright © 2018-2021 WireGuard LLC. All Rights Reserved.
+
+import Foundation
+import os.log
+
+public class Logger {
+    enum LoggerError: Error {
+        case openFailure
+    }
+
+    static var global: Logger?
+
+    var log: OpaquePointer
+    var tag: String
+
+    init(tagged tag: String, withFilePath filePath: String) throws {
+        guard let log = open_log(filePath) else { throw LoggerError.openFailure }
+        self.log = log
+        self.tag = tag
+    }
+
+    deinit {
+        close_log(self.log)
+    }
+
+    func log(message: String) {
+        write_msg_to_log(log, tag, message.trimmingCharacters(in: .newlines))
+    }
+
+    func writeLog(to targetFile: String) -> Bool {
+        return write_log_to_file(targetFile, self.log) == 0
+    }
+
+    static func configureGlobal(tagged tag: String, withFilePath filePath: String?) {
+        if Logger.global != nil {
+            return
+        }
+        guard let filePath = filePath else {
+            os_log("Unable to determine log destination path. Log will not be saved to file.", log: OSLog.default, type: .error)
+            return
+        }
+        guard let logger = try? Logger(tagged: tag, withFilePath: filePath) else {
+            os_log("Unable to open log file for writing. Log will not be saved to file.", log: OSLog.default, type: .error)
+            return
+        }
+        Logger.global = logger
+        var appVersion = Bundle.main.infoDictionary?["CFBundleShortVersionString"] as? String ?? "Unknown version"
+        if let appBuild = Bundle.main.infoDictionary?["CFBundleVersion"] as? String {
+            appVersion += " (\(appBuild))"
+        }
+
+        Logger.global?.log(message: "App version: \(appVersion)")
+    }
+}
+
+func wg_log(_ type: OSLogType, staticMessage msg: StaticString) {
+    os_log(msg, log: OSLog.default, type: type)
+    Logger.global?.log(message: "\(msg)")
+}
+
+func wg_log(_ type: OSLogType, message msg: String) {
+    os_log("%{public}s", log: OSLog.default, type: type, msg)
+    Logger.global?.log(message: msg)
+}