tunnelkit/Sources/TunnelKitWireGuardAppExtension/WireGuardTunnelProvider.swift

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import TunnelKitWireGuardCore
import TunnelKitWireGuardManager
import WireGuardKit
import __TunnelKitUtils
import SwiftyBeaver
// SPDX-License-Identifier: MIT
// Copyright © 2018-2021 WireGuard LLC. All Rights Reserved.
import Foundation
import NetworkExtension
import os
open class WireGuardTunnelProvider: NEPacketTunnelProvider {
private var cfg: WireGuard.ProviderConfiguration!
private lazy var adapter: WireGuardAdapter = {
return WireGuardAdapter(with: self) { logLevel, message in
wg_log(logLevel.osLogLevel, message: message)
}
}()
open override func startTunnel(options: [String: NSObject]?, completionHandler: @escaping (Error?) -> Void) {
// BEGIN: TunnelKit
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guard let tunnelProviderProtocol = protocolConfiguration as? NETunnelProviderProtocol else {
fatalError("Not a NETunnelProviderProtocol")
}
guard let providerConfiguration = tunnelProviderProtocol.providerConfiguration else {
fatalError("Missing providerConfiguration")
}
let tunnelConfiguration: TunnelConfiguration
do {
cfg = try fromDictionary(WireGuard.ProviderConfiguration.self, providerConfiguration)
tunnelConfiguration = cfg.configuration.tunnelConfiguration
} catch {
completionHandler(TunnelKitWireGuardError.savedProtocolConfigurationIsInvalid)
return
}
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configureLogging()
// END: TunnelKit
// Start the tunnel
adapter.start(tunnelConfiguration: tunnelConfiguration) { adapterError in
guard let adapterError = adapterError else {
let interfaceName = self.adapter.interfaceName ?? "unknown"
wg_log(.info, message: "Tunnel interface is \(interfaceName)")
completionHandler(nil)
return
}
switch adapterError {
case .cannotLocateTunnelFileDescriptor:
wg_log(.error, staticMessage: "Starting tunnel failed: could not determine file descriptor")
self.cfg._appexSetLastError(.couldNotDetermineFileDescriptor)
completionHandler(TunnelKitWireGuardError.couldNotDetermineFileDescriptor)
case .dnsResolution(let dnsErrors):
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let hostnamesWithDnsResolutionFailure = dnsErrors.map(\.address)
.joined(separator: ", ")
wg_log(.error, message: "DNS resolution failed for the following hostnames: \(hostnamesWithDnsResolutionFailure)")
self.cfg._appexSetLastError(.dnsResolutionFailure)
completionHandler(TunnelKitWireGuardError.dnsResolutionFailure)
case .setNetworkSettings(let error):
wg_log(.error, message: "Starting tunnel failed with setTunnelNetworkSettings returning \(error.localizedDescription)")
self.cfg._appexSetLastError(.couldNotSetNetworkSettings)
completionHandler(TunnelKitWireGuardError.couldNotSetNetworkSettings)
case .startWireGuardBackend(let errorCode):
wg_log(.error, message: "Starting tunnel failed with wgTurnOn returning \(errorCode)")
self.cfg._appexSetLastError(.couldNotStartBackend)
completionHandler(TunnelKitWireGuardError.couldNotStartBackend)
case .invalidState:
// Must never happen
fatalError()
}
}
}
open override func stopTunnel(with reason: NEProviderStopReason, completionHandler: @escaping () -> Void) {
wg_log(.info, staticMessage: "Stopping tunnel")
adapter.stop { error in
// BEGIN: TunnelKit
self.cfg._appexSetLastError(nil)
// END: TunnelKit
if let error = error {
wg_log(.error, message: "Failed to stop WireGuard adapter: \(error.localizedDescription)")
}
completionHandler()
#if os(macOS)
// HACK: This is a filthy hack to work around Apple bug 32073323 (dup'd by us as 47526107).
// Remove it when they finally fix this upstream and the fix has been rolled out to
// sufficient quantities of users.
exit(0)
#endif
}
}
open override func handleAppMessage(_ messageData: Data, completionHandler: ((Data?) -> Void)? = nil) {
guard let completionHandler = completionHandler else { return }
if messageData.count == 1 && messageData[0] == 0 {
adapter.getRuntimeConfiguration { settings in
var data: Data?
if let settings = settings {
data = settings.data(using: .utf8)!
}
completionHandler(data)
}
} else {
completionHandler(nil)
}
}
}
extension WireGuardTunnelProvider {
private func configureLogging() {
let logLevel: SwiftyBeaver.Level = (cfg.shouldDebug ? .debug : .info)
let logFormat = cfg.debugLogFormat ?? "$Dyyyy-MM-dd HH:mm:ss.SSS$d $L $N.$F:$l - $M"
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if cfg.shouldDebug {
let console = ConsoleDestination()
console.useNSLog = true
console.minLevel = logLevel
console.format = logFormat
SwiftyBeaver.addDestination(console)
}
let file = FileDestination(logFileURL: cfg._appexDebugLogURL)
file.minLevel = logLevel
file.format = logFormat
file.logFileMaxSize = 20000
SwiftyBeaver.addDestination(file)
// store path for clients
cfg._appexSetDebugLogPath()
}
}
extension WireGuardLogLevel {
var osLogLevel: OSLogType {
switch self {
case .verbose:
return .debug
case .error:
return .error
}
}
}