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// SPDX-License-Identifier: MIT
// Copyright © 2018-2019 WireGuard LLC. All Rights Reserved.
import Foundation
import Network
import NetworkExtension
import os.log
class PacketTunnelProvider: NEPacketTunnelProvider {
private let dispatchQueue = DispatchQueue(label: "PacketTunnel", qos: .utility)
private var handle: Int32?
private var networkMonitor: NWPathMonitor?
private var ifname: String?
private var packetTunnelSettingsGenerator: PacketTunnelSettingsGenerator?
deinit {
networkMonitor?.cancel()
}
override func startTunnel(options: [String: NSObject]?, completionHandler startTunnelCompletionHandler: @escaping (Error?) -> Void) {
dispatchQueue.async {
let activationAttemptId = options?["activationAttemptId"] as? String
let errorNotifier = ErrorNotifier(activationAttemptId: activationAttemptId)
guard let tunnelProviderProtocol = self.protocolConfiguration as? NETunnelProviderProtocol,
let tunnelConfiguration = tunnelProviderProtocol.asTunnelConfiguration() else {
errorNotifier.notify(PacketTunnelProviderError.savedProtocolConfigurationIsInvalid)
startTunnelCompletionHandler(PacketTunnelProviderError.savedProtocolConfigurationIsInvalid)
return
}
self.configureLogger()
#if os(macOS)
wgEnableRoaming(true)
#endif
wg_log(.info, message: "Starting tunnel from the " + (activationAttemptId == nil ? "OS directly, rather than the app" : "app"))
let endpoints = tunnelConfiguration.peers.map { $0.endpoint }
guard let resolvedEndpoints = DNSResolver.resolveSync(endpoints: endpoints) else {
errorNotifier.notify(PacketTunnelProviderError.dnsResolutionFailure)
startTunnelCompletionHandler(PacketTunnelProviderError.dnsResolutionFailure)
return
}
assert(endpoints.count == resolvedEndpoints.count)
self.packetTunnelSettingsGenerator = PacketTunnelSettingsGenerator(tunnelConfiguration: tunnelConfiguration, resolvedEndpoints: resolvedEndpoints)
self.setTunnelNetworkSettings(self.packetTunnelSettingsGenerator!.generateNetworkSettings()) { error in
self.dispatchQueue.async {
if let error = error {
wg_log(.error, message: "Starting tunnel failed with setTunnelNetworkSettings returning \(error.localizedDescription)")
errorNotifier.notify(PacketTunnelProviderError.couldNotSetNetworkSettings)
startTunnelCompletionHandler(PacketTunnelProviderError.couldNotSetNetworkSettings)
} else {
self.networkMonitor = NWPathMonitor()
self.networkMonitor!.pathUpdateHandler = { [weak self] path in
self?.pathUpdate(path: path)
}
self.networkMonitor!.start(queue: self.dispatchQueue)
let fileDescriptor = (self.packetFlow.value(forKeyPath: "socket.fileDescriptor") as? Int32) ?? -1
if fileDescriptor < 0 {
wg_log(.error, staticMessage: "Starting tunnel failed: Could not determine file descriptor")
errorNotifier.notify(PacketTunnelProviderError.couldNotDetermineFileDescriptor)
startTunnelCompletionHandler(PacketTunnelProviderError.couldNotDetermineFileDescriptor)
return
}
self.ifname = Self.getInterfaceName(fileDescriptor: fileDescriptor)
wg_log(.info, message: "Tunnel interface is \(self.ifname ?? "unknown")")
let handle = self.packetTunnelSettingsGenerator!.uapiConfiguration()
.withCString { return wgTurnOn($0, fileDescriptor) }
if handle < 0 {
wg_log(.error, message: "Starting tunnel failed with wgTurnOn returning \(handle)")
errorNotifier.notify(PacketTunnelProviderError.couldNotStartBackend)
startTunnelCompletionHandler(PacketTunnelProviderError.couldNotStartBackend)
return
}
self.handle = handle
startTunnelCompletionHandler(nil)
}
}
}
}
}
override func stopTunnel(with reason: NEProviderStopReason, completionHandler: @escaping () -> Void) {
dispatchQueue.async {
self.networkMonitor?.cancel()
self.networkMonitor = nil
ErrorNotifier.removeLastErrorFile()
wg_log(.info, staticMessage: "Stopping tunnel")
if let handle = self.handle {
wgTurnOff(handle)
}
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
}
}
override func handleAppMessage(_ messageData: Data, completionHandler: ((Data?) -> Void)? = nil) {
dispatchQueue.async {
guard let completionHandler = completionHandler else { return }
guard let handle = self.handle else {
completionHandler(nil)
return
}
if messageData.count == 1 && messageData[0] == 0 {
if let settings = wgGetConfig(handle) {
let data = String(cString: settings).data(using: .utf8)!
completionHandler(data)
free(settings)
} else {
completionHandler(nil)
}
} else {
completionHandler(nil)
}
}
}
private class func getInterfaceName(fileDescriptor: Int32) -> String? {
var ifnameBytes = [CChar](repeating: 0, count: Int(IF_NAMESIZE))
return ifnameBytes.withUnsafeMutableBufferPointer { bufferPointer -> String? in
guard let baseAddress = bufferPointer.baseAddress else { return nil }
var ifnameSize = socklen_t(bufferPointer.count)
let result = getsockopt(
fileDescriptor,
2 /* SYSPROTO_CONTROL */,
2 /* UTUN_OPT_IFNAME */,
baseAddress, &ifnameSize
)
if result == 0 {
return String(cString: baseAddress)
} else {
return nil
}
}
}
private func configureLogger() {
Logger.configureGlobal(tagged: "NET", withFilePath: FileManager.logFileURL?.path)
wgSetLogger { level, msgC in
guard let msgC = msgC else { return }
let logType: OSLogType
switch level {
case 0:
logType = .debug
case 1:
logType = .info
case 2:
logType = .error
default:
logType = .default
}
wg_log(logType, message: String(cString: msgC))
}
}
private func pathUpdate(path: Network.NWPath) {
guard let handle = handle else { return }
wg_log(.debug, message: "Network change detected with \(path.status) route and interface order \(path.availableInterfaces)")
#if os(iOS)
if let packetTunnelSettingsGenerator = packetTunnelSettingsGenerator {
_ = packetTunnelSettingsGenerator.endpointUapiConfiguration()
.withCString { return wgSetConfig(handle, $0) }
}
#endif
wgBumpSockets(handle)
}
}
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