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// SPDX-License-Identifier: MIT
// Copyright © 2018 WireGuard LLC. All rights reserved.
import Foundation
import NetworkExtension
import os.log
class TunnelContainer {
var name: String { return tunnelProvider.localizedDescription ?? "" }
fileprivate let tunnelProvider: NETunnelProviderManager
fileprivate var index: Int
init(tunnel: NETunnelProviderManager, index: Int) {
self.tunnelProvider = tunnel
self.index = index
}
func tunnelConfiguration() -> TunnelConfiguration? {
return (tunnelProvider.protocolConfiguration as! NETunnelProviderProtocol).tunnelConfiguration()
}
}
protocol TunnelsManagerDelegate: class {
func tunnelAdded(at: Int)
func tunnelModified(at: Int)
func tunnelsChanged()
}
class TunnelsManager {
var tunnels: [TunnelContainer]
weak var delegate: TunnelsManagerDelegate? = nil
private var isAddingTunnel: Bool = false
private var isModifyingTunnel: Bool = false
private var isDeletingTunnel: Bool = false
enum TunnelsManagerError: Error {
case tunnelsUninitialized
}
init(tunnelProviders: [NETunnelProviderManager]) {
var tunnels = tunnelProviders.map { TunnelContainer(tunnel: $0, index: 0) }
tunnels.sort { $0.name < $1.name }
for i in 0 ..< tunnels.count {
tunnels[i].index = i
}
self.tunnels = tunnels
}
static func create(completionHandler: @escaping (TunnelsManager?) -> Void) {
NETunnelProviderManager.loadAllFromPreferences { (managers, error) in
if let error = error {
os_log("Failed to load tunnel provider managers %{public}@", log: OSLog.default, type: .debug, "\(error)")
return
}
completionHandler(TunnelsManager(tunnelProviders: managers ?? []))
}
}
private func insertionIndexFor(tunnelName: String) -> Int {
// Wishlist: Use binary search instead
for i in 0 ..< tunnels.count {
if (tunnelName.lexicographicallyPrecedes(tunnels[i].name)) { return i }
}
return tunnels.count
}
func add(tunnelConfiguration: TunnelConfiguration, completionHandler: @escaping (TunnelContainer?, Error?) -> Void) {
let tunnelName = tunnelConfiguration.interface.name
assert(!tunnelName.isEmpty)
isAddingTunnel = true
let tunnelProviderManager = NETunnelProviderManager()
tunnelProviderManager.protocolConfiguration = NETunnelProviderProtocol(tunnelConfiguration: tunnelConfiguration)
tunnelProviderManager.localizedDescription = tunnelName
tunnelProviderManager.isEnabled = true
tunnelProviderManager.saveToPreferences { [weak self] (error) in
defer { self?.isAddingTunnel = false }
guard (error == nil) else {
completionHandler(nil, error)
return
}
if let s = self {
let index = s.insertionIndexFor(tunnelName: tunnelName)
let tunnel = TunnelContainer(tunnel: tunnelProviderManager, index: index)
for i in index ..< s.tunnels.count {
s.tunnels[i].index = s.tunnels[i].index + 1
}
s.tunnels.insert(tunnel, at: index)
s.delegate?.tunnelAdded(at: index)
completionHandler(tunnel, nil)
}
}
}
func modify(tunnel: TunnelContainer, with tunnelConfiguration: TunnelConfiguration, completionHandler: @escaping (Error?) -> Void) {
let tunnelName = tunnelConfiguration.interface.name
assert(!tunnelName.isEmpty)
isModifyingTunnel = true
let tunnelProviderManager = tunnel.tunnelProvider
let isNameChanged = (tunnelName != tunnelProviderManager.localizedDescription)
tunnelProviderManager.protocolConfiguration = NETunnelProviderProtocol(tunnelConfiguration: tunnelConfiguration)
tunnelProviderManager.localizedDescription = tunnelName
tunnelProviderManager.isEnabled = true
tunnelProviderManager.saveToPreferences { [weak self] (error) in
defer { self?.isModifyingTunnel = false }
guard (error != nil) else {
completionHandler(error)
return
}
if let s = self {
if (isNameChanged) {
s.tunnels.remove(at: tunnel.index)
for i in tunnel.index ..< s.tunnels.count {
s.tunnels[i].index = s.tunnels[i].index - 1
}
let index = s.insertionIndexFor(tunnelName: tunnelName)
tunnel.index = index
for i in index ..< s.tunnels.count {
s.tunnels[i].index = s.tunnels[i].index + 1
}
s.tunnels.insert(tunnel, at: index)
s.delegate?.tunnelsChanged()
} else {
s.delegate?.tunnelModified(at: tunnel.index)
}
completionHandler(nil)
}
}
}
func remove(tunnel: TunnelContainer, completionHandler: @escaping (Error?) -> Void) {
let tunnelProviderManager = tunnel.tunnelProvider
let tunnelIndex = tunnel.index
isDeletingTunnel = true
tunnelProviderManager.removeFromPreferences { [weak self] (error) in
defer { self?.isDeletingTunnel = false }
guard (error != nil) else {
completionHandler(error)
return
}
if let s = self {
for i in ((tunnelIndex + 1) ..< s.tunnels.count) {
s.tunnels[i].index = s.tunnels[i].index + 1
}
s.tunnels.remove(at: tunnelIndex)
}
completionHandler(nil)
}
}
func numberOfTunnels() -> Int {
return tunnels.count
}
func tunnel(at index: Int) -> TunnelContainer {
return tunnels[index]
}
}
extension NETunnelProviderProtocol {
convenience init?(tunnelConfiguration: TunnelConfiguration) {
assert(!tunnelConfiguration.interface.name.isEmpty)
guard let serializedTunnelConfiguration = try? JSONEncoder().encode(tunnelConfiguration) else { return nil }
self.init()
let appId = Bundle.main.bundleIdentifier!
let firstValidEndpoint = tunnelConfiguration.peers.first(where: { $0.endpoint != nil })?.endpoint
providerBundleIdentifier = "\(appId).WireGuardNetworkExtension"
providerConfiguration = [
"tunnelConfiguration": serializedTunnelConfiguration
]
serverAddress = firstValidEndpoint?.stringRepresentation() ?? "Unspecified"
username = tunnelConfiguration.interface.name
}
func tunnelConfiguration() -> TunnelConfiguration? {
guard let serializedTunnelConfiguration = providerConfiguration?["tunnelConfiguration"] as? Data else { return nil }
return try? JSONDecoder().decode(TunnelConfiguration.self, from: serializedTunnelConfiguration)
}
}
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