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wireguard-apple
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NE: Communicate last error to app through a shared file 

Signed-off-by: Roopesh Chander <roop@roopc.net>
This commit is contained in:
Roopesh Chander 2018-12-14 02:24:53 +05:30
parent 501e412b84
commit 48552d2663
4 changed files with 84 additions and 16 deletions
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12
WireGuard/Shared/FileManager+Extension.swift
View File

@ -17,6 +17,18 @@ extension FileManager {
return sharedFolderURL.appendingPathComponent("tunnel-log.txt")
}
static var networkExtensionLastErrorFileURL: URL? {
guard let appGroupId = Bundle.main.object(forInfoDictionaryKey: "com.wireguard.ios.app_group_id") as? String else {
os_log("Can't obtain app group id from bundle", log: OSLog.default, type: .error)
return nil
}
guard let sharedFolderURL = FileManager.default.containerURL(forSecurityApplicationGroupIdentifier: appGroupId) else {
os_log("Can't obtain shared folder URL", log: OSLog.default, type: .error)
return nil
}
return sharedFolderURL.appendingPathComponent("last-error.txt")
}
static var appLogFileURL: URL? {
guard let documentDirURL = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask).first else {
os_log("Can't obtain app documents folder URL", log: OSLog.default, type: .error)

33
WireGuard/WireGuard/Tunnel/TunnelsManager.swift
View File

@ -41,8 +41,14 @@ enum TunnelsManagerActivationAttemptError: WireGuardAppError {
enum TunnelsManagerActivationError: WireGuardAppError {
case activationFailed
case activationFailedWithExtensionError(title: String, message: String)
var alertText: AlertText {
return ("Activation failure", "The tunnel could not be activated. Please ensure you are connected to the Internet.")
switch self {
case .activationFailed:
return ("Activation failure", "The tunnel could not be activated. Please ensure you are connected to the Internet.")
case .activationFailedWithExtensionError(let title, let message):
return (title, message)
}
}
}
@ -297,7 +303,11 @@ class TunnelsManager {
self.activationDelegate?.tunnelActivationSucceeded(tunnel: tunnel)
} else if session.status == .disconnected {
tunnel.isAttemptingActivation = false
self.activationDelegate?.tunnelActivationFailed(tunnel: tunnel, error: .activationFailed)
if let (title, message) = self.lastErrorTextFromNetworkExtension(for: tunnel) {
self.activationDelegate?.tunnelActivationFailed(tunnel: tunnel, error: .activationFailedWithExtensionError(title: title, message: message))
} else {
self.activationDelegate?.tunnelActivationFailed(tunnel: tunnel, error: .activationFailed)
}
}
}
@ -321,6 +331,20 @@ class TunnelsManager {
}
}
func lastErrorTextFromNetworkExtension(for tunnel: TunnelContainer) -> (title: String, message: String)? {
guard let lastErrorFileURL = FileManager.networkExtensionLastErrorFileURL else { return nil }
guard let lastErrorData = try? Data(contentsOf: lastErrorFileURL) else { return nil }
guard let lastErrorText = String(data: lastErrorData, encoding: .utf8) else { return nil }
let lastErrorStrings = lastErrorText.split(separator: "\n").map { String($0) }
guard lastErrorStrings.count == 3 else { return nil }
let attemptIdInDisk = lastErrorStrings[0]
if let attemptIdForTunnel = tunnel.activationAttemptId, attemptIdInDisk == attemptIdForTunnel {
return (title: lastErrorStrings[1], message: lastErrorStrings[2])
}
return nil
}
deinit {
if let statusObservationToken = self.statusObservationToken {
NotificationCenter.default.removeObserver(statusObservationToken)
@ -335,6 +359,7 @@ class TunnelContainer: NSObject {
@objc dynamic var isActivateOnDemandEnabled: Bool
var isAttemptingActivation = false
var activationAttemptId: String?
fileprivate let tunnelProvider: NETunnelProviderManager
private var lastTunnelConnectionStatus: NEVPNStatus?
@ -398,7 +423,9 @@ class TunnelContainer: NSObject {
do {
wg_log(.debug, staticMessage: "startActivation: Starting tunnel")
self.isAttemptingActivation = true
try (tunnelProvider.connection as? NETunnelProviderSession)?.startTunnel()
let activationAttemptId = UUID().uuidString
self.activationAttemptId = activationAttemptId
try (tunnelProvider.connection as? NETunnelProviderSession)?.startTunnel(options: ["activationAttemptId": activationAttemptId])
wg_log(.debug, staticMessage: "startActivation: Success")
activationDelegate?.tunnelActivationAttemptSucceeded(tunnel: self)
} catch let error {

35
WireGuard/WireGuardNetworkExtension/ErrorNotifier.swift
View File

@ -4,7 +4,17 @@
import NetworkExtension
class ErrorNotifier {
static func errorMessage(for error: PacketTunnelProviderError) -> (String, String)? {
let activationAttemptId: String?
weak var tunnelProvider: NEPacketTunnelProvider?
init(activationAttemptId: String?, tunnelProvider: NEPacketTunnelProvider) {
self.activationAttemptId = activationAttemptId
self.tunnelProvider = tunnelProvider
ErrorNotifier.removeLastErrorFile()
}
func errorMessage(for error: PacketTunnelProviderError) -> (String, String)? {
switch error {
case .savedProtocolConfigurationIsInvalid:
return ("Activation failure", "Could not retrieve tunnel information from the saved configuration")
@ -17,9 +27,24 @@ class ErrorNotifier {
}
}
static func notify(_ error: PacketTunnelProviderError, from tunnelProvider: NEPacketTunnelProvider) {
guard let (title, message) = ErrorNotifier.errorMessage(for: error) else { return }
// displayMessage() is deprecated, but there's no better alternative to show the error to the user
tunnelProvider.displayMessage("\(title): \(message)") { _ in }
func notify(_ error: PacketTunnelProviderError) {
guard let (title, message) = errorMessage(for: error) else { return }
if let activationAttemptId = activationAttemptId, let lastErrorFilePath = FileManager.networkExtensionLastErrorFileURL?.path {
// The tunnel was started from the app
let errorMessageData = "\(activationAttemptId)\n\(title)\n\(message)".data(using: .utf8)
FileManager.default.createFile(atPath: lastErrorFilePath, contents: errorMessageData, attributes: nil)
} else {
// The tunnel was probably started from iOS Settings app
if let tunnelProvider = self.tunnelProvider {
// displayMessage() is deprecated, but there's no better alternative if invoked from iOS Settings
tunnelProvider.displayMessage("\(title): \(message)") { _ in }
}
}
}
static func removeLastErrorFile() {
if let lastErrorFileURL = FileManager.networkExtensionLastErrorFileURL {
_ = FileManager.deleteFile(at: lastErrorFileURL)
}
}
}

20
WireGuard/WireGuardNetworkExtension/PacketTunnelProvider.swift
View File

@ -28,21 +28,23 @@ class PacketTunnelProvider: NEPacketTunnelProvider {
networkMonitor?.cancel()
}
/// Begin the process of establishing the tunnel.
override func startTunnel(options: [String: NSObject]?, completionHandler startTunnelCompletionHandler: @escaping (Error?) -> Void) {
let activationAttemptId = options?["activationAttemptId"] as? String
let errorNotifier = ErrorNotifier(activationAttemptId: activationAttemptId, tunnelProvider: self)
guard let tunnelProviderProtocol = self.protocolConfiguration as? NETunnelProviderProtocol,
let tunnelConfiguration = tunnelProviderProtocol.tunnelConfiguration() else {
ErrorNotifier.notify(PacketTunnelProviderError.savedProtocolConfigurationIsInvalid, from: self)
errorNotifier.notify(PacketTunnelProviderError.savedProtocolConfigurationIsInvalid)
startTunnelCompletionHandler(PacketTunnelProviderError.savedProtocolConfigurationIsInvalid)
return
}
startTunnel(with: tunnelConfiguration, completionHandler: startTunnelCompletionHandler)
startTunnel(with: tunnelConfiguration, errorNotifier: errorNotifier, completionHandler: startTunnelCompletionHandler)
}
//swiftlint:disable:next function_body_length
func startTunnel(with tunnelConfiguration: TunnelConfiguration, completionHandler startTunnelCompletionHandler: @escaping (Error?) -> Void) {
func startTunnel(with tunnelConfiguration: TunnelConfiguration, errorNotifier: ErrorNotifier, completionHandler startTunnelCompletionHandler: @escaping (Error?) -> Void) {
configureLogger()
@ -55,7 +57,7 @@ class PacketTunnelProvider: NEPacketTunnelProvider {
} catch DNSResolverError.dnsResolutionFailed(let hostnames) {
wg_log(.error, staticMessage: "Starting tunnel failed: DNS resolution failure")
wg_log(.error, message: "Hostnames for which DNS resolution failed: \(hostnames.joined(separator: ", "))")
ErrorNotifier.notify(PacketTunnelProviderError.dnsResolutionFailure(hostnames: hostnames), from: self)
errorNotifier.notify(PacketTunnelProviderError.dnsResolutionFailure(hostnames: hostnames))
startTunnelCompletionHandler(PacketTunnelProviderError.dnsResolutionFailure(hostnames: hostnames))
return
} catch {
@ -73,7 +75,7 @@ class PacketTunnelProvider: NEPacketTunnelProvider {
let fileDescriptor = packetFlow.value(forKeyPath: "socket.fileDescriptor") as! Int32 //swiftlint:disable:this force_cast
if fileDescriptor < 0 {
wg_log(.error, staticMessage: "Starting tunnel failed: Could not determine file descriptor")
ErrorNotifier.notify(PacketTunnelProviderError.couldNotStartWireGuard, from: self)
errorNotifier.notify(PacketTunnelProviderError.couldNotStartWireGuard)
startTunnelCompletionHandler(PacketTunnelProviderError.couldNotStartWireGuard)
return
}
@ -101,7 +103,7 @@ class PacketTunnelProvider: NEPacketTunnelProvider {
if handle < 0 {
wg_log(.error, staticMessage: "Starting tunnel failed: Could not start WireGuard")
ErrorNotifier.notify(PacketTunnelProviderError.couldNotStartWireGuard, from: self)
errorNotifier.notify(PacketTunnelProviderError.couldNotStartWireGuard)
startTunnelCompletionHandler(PacketTunnelProviderError.couldNotStartWireGuard)
return
}
@ -115,7 +117,7 @@ class PacketTunnelProvider: NEPacketTunnelProvider {
if let error = error {
wg_log(.error, staticMessage: "Starting tunnel failed: Error setting network settings.")
wg_log(.error, message: "Error from setTunnelNetworkSettings: \(error.localizedDescription)")
ErrorNotifier.notify(PacketTunnelProviderError.coultNotSetNetworkSettings, from: self)
errorNotifier.notify(PacketTunnelProviderError.coultNotSetNetworkSettings)
startTunnelCompletionHandler(PacketTunnelProviderError.coultNotSetNetworkSettings)
} else {
startTunnelCompletionHandler(nil /* No errors */)
@ -128,6 +130,8 @@ class PacketTunnelProvider: NEPacketTunnelProvider {
networkMonitor?.cancel()
networkMonitor = nil
ErrorNotifier.removeLastErrorFile()
wg_log(.info, staticMessage: "Stopping tunnel")
if let handle = wgHandle {
wgTurnOff(handle)