715 lines
26 KiB
Swift
715 lines
26 KiB
Swift
//
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// SDLContext.swift
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// Tun
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//
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// Created by 安礼成 on 2024/2/29.
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//
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import Foundation
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import NetworkExtension
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import NIOCore
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// 上下文环境变量，全局共享
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/*
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1. 处理rsa的加解密逻辑
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*/
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func startMonitorTask(name: String, _ body: @escaping () async throws -> Void, retryDelay: Duration = .seconds(5)) -> Task<Void, Never> {
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return Task(name: name) {
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while true {
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do {
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try Task.checkCancellation()
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try await body()
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} catch is CancellationError {
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SDLLogger.log("[SDLContext] worker \(name) cancelled", for: .debug)
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break
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} catch let err {
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SDLLogger.log("[SDLContext] worker \(name) crashed: \(err.localizedDescription), will restart", for: .debug)
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do {
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try await Task.sleep(for: retryDelay)
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} catch is CancellationError {
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break
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} catch {
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break
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}
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}
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}
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}
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}
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enum SDLContextError: Error {
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case udpHoleClosed
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case dnsLocalClientClosed
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case dnsLocalClientCancelled
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case dnsClientClosed
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case dnsClientCancelled
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}
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actor SDLContextActor {
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private var config: SDLConfiguration
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// nat的网络类型
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var natType: SDLNATProberActor.NatType = .blocked
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// AES加密，授权通过后，对象才会被创建
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private var dataCipher: CCDataCipher?
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// session token
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private var sessionToken: Data?
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// rsa的相关配置, public_key是本地生成的
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// 加密算法相关
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nonisolated let rsaCipher: RSACipher
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private var dnsService: DNSService?
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private let superService: SDLSuperService
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private let udpHoleService: SDLUDPHoleService
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private let packetOutboundActor: PacketOutboundActor
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private let packetInboundActor: PacketInboundActor
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private let tunNetworkManager: SDLTunNetworkManager
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private let publicDnsServers = ["223.5.5.5", "119.29.29.29"]
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nonisolated private let puncherActor: SDLPuncherActor
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// 网络探测对象
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nonisolated private let proberActor: SDLNATProberActor
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// 本地ipv6地址信息探测
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private var ipv6AssistClient: SDLIPV6AssistClient?
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private let sessionManager: SessionManager
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nonisolated private let arpResolver: ArpResolver
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// 内部socket通讯
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// 改为基于 App Group + Darwin Notification 的通知
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// 流量统计
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nonisolated private let flowTracer: SDLFlowTracer
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nonisolated private let provider: NEPacketTunnelProvider
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// 处理权限控制
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private let policyService: PolicyService
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private var updatePolicyWorker: PeriodicWorker?
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// stunRequest任务
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private var stunRequestWorker: PeriodicWorker?
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private var rootTask: Task<Void, Error>?
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private let readySignal = AsyncOneShot<Void>()
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public init(provider: NEPacketTunnelProvider, config: SDLConfiguration, rsaCipher: RSACipher) {
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let puncherActor = SDLPuncherActor()
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let proberActor = SDLNATProberActor(addressArray: config.stunProbeSocketAddressArray)
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let sessionManager = SessionManager()
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let arpResolver = ArpResolver()
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let flowTracer = SDLFlowTracer()
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let policyService = PolicyService(identityId: config.identityId, acl: config.acl)
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let superService = SDLSuperService(serverEndpoint: config.serverEndpoint)
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let udpHoleService = SDLUDPHoleService(proberActor: proberActor)
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let tunNetworkManager = SDLTunNetworkManager(provider: provider)
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let packetOutboundActor = PacketOutboundActor(
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provider: provider,
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config: config,
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dataCipher: nil,
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sessionManager: sessionManager,
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arpResolver: arpResolver,
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puncherActor: puncherActor,
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policyService: policyService,
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superService: superService,
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udpHoleService: udpHoleService,
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flowTracer: flowTracer
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)
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let packetInboundActor = PacketInboundActor(
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provider: provider,
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config: config,
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dataCipher: nil,
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policyService: policyService,
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packetOutboundActor: packetOutboundActor,
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arpResolver: arpResolver,
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superService: superService,
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flowTracer: flowTracer
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)
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self.provider = provider
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self.config = config
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self.rsaCipher = rsaCipher
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self.puncherActor = puncherActor
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self.proberActor = proberActor
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self.sessionManager = sessionManager
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self.arpResolver = arpResolver
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self.flowTracer = flowTracer
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// 权限控制
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self.policyService = policyService
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self.superService = superService
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self.udpHoleService = udpHoleService
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self.packetOutboundActor = packetOutboundActor
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self.packetInboundActor = packetInboundActor
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self.tunNetworkManager = tunNetworkManager
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}
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public func start() async throws {
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guard self.rootTask == nil else {
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try await self.readySignal.wait(timeout: .seconds(30))
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return
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}
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let rootTask = Task {
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try await self.runRoot()
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}
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self.rootTask = rootTask
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do {
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try await self.readySignal.wait(timeout: .seconds(30))
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} catch {
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rootTask.cancel()
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_ = try? await rootTask.value
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self.rootTask = nil
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throw error
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}
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}
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// 处理context的停止问题
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public func stop() async {
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let rootTask = self.rootTask
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self.rootTask = nil
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rootTask?.cancel()
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_ = try? await rootTask?.value
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await self.cleanupRoot()
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}
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private func runRoot() async throws {
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do {
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try await self.runRootBody()
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await self.cleanupRoot()
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} catch is CancellationError {
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await self.cleanupRoot()
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throw CancellationError()
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} catch {
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await self.readySignal.fail(error)
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await self.cleanupRoot()
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throw error
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}
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}
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private func runRootBody() async throws {
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self.prepareTunnelNotifier()
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// 启动arp的定时清理任务
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await self.puncherActor.start()
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await self.arpResolver.start()
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let dnsService = DNSService(serverIP: self.config.serverEndpoint.ip, publicDnsServers: self.publicDnsServers) { [weak self] event in
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await self?.handleDNSEvent(event)
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}
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self.dnsService = dnsService
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await self.packetOutboundActor.updateDNSService(dnsService)
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await dnsService.start()
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await self.superService.updateMessageHandler { [weak self] message in
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await self?.handleSuperMessage(message: message)
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}
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let packetInboundActor = self.packetInboundActor
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await self.udpHoleService.updateHandlers(
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onEvent: { [weak self] event in
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await self?.handleUDPHoleControlEvent(event)
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},
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onData: { data in
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await packetInboundActor.handleData(data)
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}
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)
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let superService = self.superService
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let udpHoleService = self.udpHoleService
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let packetOutboundActor = self.packetOutboundActor
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let readySignal = self.readySignal
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try await withThrowingTaskGroup(of: Void.self) { group in
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defer {
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group.cancelAll()
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}
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group.addTask {
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try await Self.runRestarting(name: "superService") {
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try await superService.run()
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}
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}
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group.addTask {
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try await Self.runRestarting(name: "udpHoleService") {
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try await udpHoleService.run(includeV6: false)
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}
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}
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group.addTask(priority: .high) {
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_ = try await readySignal.wait()
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try await packetOutboundActor.runPacketReader()
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}
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try await group.waitForAll()
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}
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}
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private static func runRestarting(
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name: String,
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retryDelay: Duration = .seconds(5),
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operation: @escaping @Sendable () async throws -> Void
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) async throws {
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while !Task.isCancelled {
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do {
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try Task.checkCancellation()
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try await operation()
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SDLLogger.log("[SDLContext] worker \(name) ended, will restart", for: .debug)
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} catch is CancellationError {
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SDLLogger.log("[SDLContext] worker \(name) cancelled", for: .debug)
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throw CancellationError()
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} catch {
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SDLLogger.log("[SDLContext] worker \(name) crashed: \(error.localizedDescription), will restart", for: .debug)
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}
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try await Task.sleep(for: retryDelay)
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}
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}
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private func cleanupRoot() async {
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await self.puncherActor.stop()
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await self.arpResolver.stop()
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await self.sessionManager.clear()
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await self.stunRequestWorker?.stop()
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self.stunRequestWorker = nil
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await self.updatePolicyWorker?.stop()
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self.updatePolicyWorker = nil
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await self.policyService.clear()
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await self.udpHoleService.stop()
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let dnsService = self.dnsService
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self.dnsService = nil
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await self.packetOutboundActor.updateDNSService(nil)
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await dnsService?.stop()
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await self.superService.stop()
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self.sessionToken = nil
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self.dataCipher = nil
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self.natType = .blocked
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await self.packetOutboundActor.updateRuntime(config: self.config, dataCipher: nil)
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await self.packetInboundActor.updateRuntime(config: self.config, dataCipher: nil)
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await self.ipv6AssistClient?.stop()
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self.ipv6AssistClient = nil
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}
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deinit {
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SDLLogger.log("[SDLContext] deinit", for: .debug)
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}
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}
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// MARK: probe网络类型
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extension SDLContextActor {
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private func setNatType(natType: SDLNATProberActor.NatType) {
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self.natType = natType
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}
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}
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// MARK: Notifier通知机制
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extension SDLContextActor {
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private func prepareTunnelNotifier() {
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// 启动noticeClient
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// 旧的 UDP NoticeClient 已移除，改为初始化基于 App Group 的通知通道。
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SDLTunnelAppNotifier.shared.clear()
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SDLLogger.log("[SDLContext] tunnelAppNotifier ready")
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}
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private func publishTunnelEvent(code: Int? = nil, message: String) {
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SDLTunnelAppNotifier.shared.publish(code: code, message: message)
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}
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}
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// MARK: 数据发送
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extension SDLContextActor {
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// 发送给super/stun节点的数据
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private func sendSuperPacket(type: SDLPacketType, data: Data) async {
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await self.sendPacket(type: type, data: data, remoteAddress: self.config.stunSocketAddress)
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}
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// 发送给peer的数据
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private func sendPeerPacket(type: SDLPacketType, data: Data, remoteAddress: SocketAddress) async {
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await self.sendPacket(type: type, data: data, remoteAddress: remoteAddress)
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}
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private func sendPacket(type: SDLPacketType, data: Data, remoteAddress: SocketAddress) async {
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await self.udpHoleService.send(type: type, data: data, remoteAddress: remoteAddress)
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}
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}
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// MARK: 处理和Super之间的通讯
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extension SDLContextActor {
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private func handleSuperMessage(message: SDLQUICInboundMessage) async {
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switch message {
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case .welcome(let welcome):
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SDLLogger.log("[SDLContext] quic welcome: \(welcome)")
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await self.ipv6AssistClient?.stop()
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self.ipv6AssistClient = nil
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// 尝试创建v6地址的辅助探测器
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if welcome.hasIpv6Assist {
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self.ipv6AssistClient = SDLIPV6AssistClient(assistServerInfo: welcome.ipv6Assist)
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await self.ipv6AssistClient?.start()
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}
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// 注册
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await self.doRegisterSuper()
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SDLLogger.log("[SDLContext] quic doRegisterSuper")
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case .pong:
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//SDLLogger.shared.log("[SDLContext] quic pong")
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()
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case .registerSuperAck(let registerSuperAck):
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await self.handleRegisterSuperAck(registerSuperAck: registerSuperAck)
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case .registerSuperNak(let registerSuperNak):
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await self.handleRegisterSuperNak(nakPacket: registerSuperNak)
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case .peerInfo(let peerInfo):
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SDLLogger.log("[SDLContext] peer message: \(peerInfo)")
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let packets = await self.puncherActor.makeRegisterPackets(peerInfo: peerInfo)
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for packet in packets {
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await self.udpHoleService.send(type: .register, data: packet.data, remoteAddress: packet.remoteAddress)
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}
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case .event(let event):
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await self.handleEvent(event: event)
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case .policyReponse(let policyResponse):
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// 处理权限的请求问题
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await self.policyService.applyPolicyResponse(policyResponse)
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case .exposedServiceResponse(let response):
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await self.applyExposedServiceResponse(response)
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case .arpResponse(let arpResponse):
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SDLLogger.log("[SDLContext] get arp response: \(arpResponse)")
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await self.arpResolver.handleArpResponse(arpResponse: arpResponse)
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}
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}
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private func makeSuperEventProcessor() -> SDLSuperEventProcessor {
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return .init(networkAddress: self.config.networkAddress)
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}
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private func handleRegisterSuperAck(registerSuperAck: SDLRegisterSuperAck) async {
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// 需要对数据通过rsa的私钥解码
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guard let key = try? self.rsaCipher.decode(data: Data(registerSuperAck.key)) else {
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SDLLogger.log("[SDLContext] registerSuperAck invalid key")
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let error = SDLError.invalidKey
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await self.readySignal.fail(error)
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self.provider.cancelTunnelWithError(error)
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return
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}
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let algorithm = registerSuperAck.algorithm.lowercased()
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let regionId = registerSuperAck.regionID
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self.sessionToken = registerSuperAck.sessionToken
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switch algorithm {
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case "aes":
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self.dataCipher = CCAESChiper(key: key)
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case "chacha20":
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self.dataCipher = CCChaCha20Cipher(regionId: regionId, keyData: key)
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default:
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SDLLogger.log("[SDLContext] registerSuperAck invalid algorithm \(algorithm)")
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let error = SDLError.unsupportedAlgorithm(algorithm: algorithm)
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await self.readySignal.fail(error)
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self.provider.cancelTunnelWithError(error)
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return
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}
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await self.packetOutboundActor.updateRuntime(config: self.config, dataCipher: self.dataCipher)
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await self.packetInboundActor.updateRuntime(config: self.config, dataCipher: self.dataCipher)
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SDLLogger.log("[SDLContext] registerSuperAck, use algorithm \(algorithm), key len: \(key.count)")
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// 服务器分配的tun网卡信息
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do {
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try await self.tunNetworkManager.apply(settings: .init(config: self.config), dnsServer: DNSHelper.dnsServer)
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SDLLogger.log("[SDLContext] setNetworkSettings successed")
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// 开启权限的定时更新
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await self.whenRegistedSuper()
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await self.readySignal.succeed(())
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} catch let err {
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SDLLogger.log("[SDLContext] setTunnelNetworkSettings get error: \(err)")
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await self.readySignal.fail(err)
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self.provider.cancelTunnelWithError(err)
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}
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}
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// 注册成功super的回调函数
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private func whenRegistedSuper() async {
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await self.updatePolicyWorker?.stop()
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let policyService = self.policyService
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let superService = self.superService
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let updatePolicyWorker = PeriodicWorker(
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configuration: .init(
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interval: .seconds(10),
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runImmediately: true,
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mode: .fixedDelay,
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errorPolicy: .keepRunning(delay: .seconds(5))
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),
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operation: {
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SDLLogger.log("[SDLContext] updatePolicyTask execute")
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await policyService.updatePolicy(superService: superService)
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},
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onError: { err in
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SDLLogger.log("[SDLContext] updatePolicyTask stop with err: \(err)")
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}
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)
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self.updatePolicyWorker = updatePolicyWorker
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await updatePolicyWorker.start()
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// 启动stun任务
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await self.startStunRequestTask()
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}
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private func handleRegisterSuperNak(nakPacket: SDLRegisterSuperNak) async {
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let errorMessage = nakPacket.errorMessage
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guard let errorCode = SDLNAKErrorCode(rawValue: UInt8(nakPacket.errorCode)) else {
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return
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}
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switch errorCode {
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case .invalidToken, .nodeDisabled:
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self.publishTunnelEvent(code: Int(errorCode.rawValue), message: errorMessage)
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// 报告错误并退出
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let error = NSError(domain: "com.jihe.punchnet.tun", code: -1)
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await self.readySignal.fail(error)
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self.provider.cancelTunnelWithError(error)
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case .noIpAddress, .networkFault, .internalFault:
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self.publishTunnelEvent(code: Int(errorCode.rawValue), message: errorMessage)
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}
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SDLLogger.log("[SDLContext] Get a SuperNak message exit")
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}
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private func handleEvent(event: SDLEvent) async {
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let processor = self.makeSuperEventProcessor()
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let plan = await processor.makeProcessingPlan(event: event)
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if let logMessage = plan.logMessage {
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SDLLogger.log(logMessage)
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}
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switch plan.action {
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case .removeSession(let dstMac):
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await self.sessionManager.removeSession(dstMac: dstMac)
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case .sendRegister(let registerData, let remoteAddresses):
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for remoteAddress in remoteAddresses {
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await self.sendPeerPacket(type: .register, data: registerData, remoteAddress: remoteAddress)
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}
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case .requestExposedService:
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await self.requestExposedService()
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case .shutdown(let message):
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self.publishTunnelEvent(message: message)
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|
||
// 报告错误并退出
|
||
let error = NSError(domain: "com.jihe.punchnet.tun", code: -2)
|
||
self.provider.cancelTunnelWithError(error)
|
||
case .none:
|
||
()
|
||
}
|
||
}
|
||
|
||
private func doRegisterSuper() async {
|
||
// 注册
|
||
var registerSuper = SDLRegisterSuper()
|
||
registerSuper.clientID = self.config.clientId
|
||
registerSuper.networkID = self.config.networkAddress.networkId
|
||
registerSuper.mac = self.config.networkAddress.mac
|
||
registerSuper.ip = self.config.networkAddress.ip
|
||
registerSuper.maskLen = UInt32(self.config.networkAddress.maskLen)
|
||
registerSuper.hostname = self.config.hostname
|
||
registerSuper.pubKey = self.rsaCipher.pubKey
|
||
registerSuper.accessToken = self.config.accessToken
|
||
|
||
if let registerSuperData = try? registerSuper.serializedData() {
|
||
SDLLogger.log("[SDLContext] will send register super")
|
||
await self.superService.send(type: .registerSuper, data: registerSuperData)
|
||
}
|
||
}
|
||
|
||
private func requestExposedService() async {
|
||
guard let requestData = await self.policyService.makeExposedServiceRequest() else {
|
||
return
|
||
}
|
||
|
||
await self.superService.send(type: .exposedServiceRequest, data: requestData)
|
||
}
|
||
|
||
private func applyExposedServiceResponse(_ response: SDLExposedServiceResponse) async {
|
||
guard let acl = await self.policyService.applyExposedServiceResponse(response) else {
|
||
return
|
||
}
|
||
|
||
self.config.acl = acl
|
||
}
|
||
|
||
}
|
||
|
||
// MARK: DNS service events
|
||
extension SDLContextActor {
|
||
private func handleDNSEvent(_ event: DNSService.Event) async {
|
||
switch event {
|
||
case .packet(let packet):
|
||
let nePacket = NEPacket(data: packet, protocolFamily: 2)
|
||
self.provider.packetFlow.writePacketObjects([nePacket])
|
||
}
|
||
}
|
||
}
|
||
|
||
// MARK: 处理从Hole收到的数据
|
||
extension SDLContextActor {
|
||
private func handleUDPHoleControlEvent(_ event: SDLUDPHoleService.Event) async {
|
||
switch event {
|
||
case .ready(let localAddress):
|
||
SDLLogger.log("[SDLContext] udpHole ready: \(localAddress)")
|
||
case .natType(let natType):
|
||
self.setNatType(natType: natType)
|
||
SDLLogger.log("[SDLContext] nat_type is: \(natType)")
|
||
case .packet(let remoteAddress, let message, let source):
|
||
await self.handleUDPHolePacket(remoteAddress: remoteAddress, message: message, source: source)
|
||
case .closed(let error):
|
||
SDLLogger.log("[SDLContext] udpHole closed: \(error)", for: .debug)
|
||
}
|
||
}
|
||
|
||
private func handleUDPHolePacket(remoteAddress: SocketAddress, message: SDLHoleControlMessage, source: SDLUDPHoleKind) async {
|
||
switch message {
|
||
case .stunReply(_), .stunProbeReply(_):
|
||
SDLLogger.log("[SDLContext] get a stun reply", for: .debug)
|
||
case .register(let register):
|
||
try? await self.handleRegister(remoteAddress: remoteAddress, register: register, source: source)
|
||
case .registerAck(let registerAck):
|
||
await self.handleRegisterAck(remoteAddress: remoteAddress, registerAck: registerAck, source: source)
|
||
}
|
||
}
|
||
|
||
private func handleRegister(remoteAddress: SocketAddress, register: SDLRegister, source: SDLUDPHoleKind) async throws {
|
||
let networkAddr = config.networkAddress
|
||
SDLLogger.log("[SDLContext] register packet: \(register), network_address: \(networkAddr)")
|
||
|
||
// 判断目标地址是否是tun的网卡地址, 并且是在同一个网络下
|
||
if register.dstMac == networkAddr.mac && register.networkID == networkAddr.networkId {
|
||
// 回复ack包
|
||
var registerAck = SDLRegisterAck()
|
||
registerAck.networkID = networkAddr.networkId
|
||
registerAck.srcMac = networkAddr.mac
|
||
registerAck.dstMac = register.srcMac
|
||
|
||
await self.sendPeerPacket(type: .registerAck, data: try registerAck.serializedData(), remoteAddress: remoteAddress)
|
||
// 这里需要建立到来源的会话, 在复杂网络下，通过super-node查询到的nat地址不一定靠谱，需要通过udp包的来源地址作为nat地址
|
||
if let session = Session(dstMac: register.srcMac, natAddress: remoteAddress, addressType: source.convertAddressType()) {
|
||
await self.sessionManager.addSession(session: session)
|
||
} else {
|
||
SDLLogger.log("[SDLContext] didReadRegister get unsupported remoteAddress: \(remoteAddress)", for: .debug)
|
||
}
|
||
} else {
|
||
SDLLogger.log("[SDLContext] didReadRegister get a invalid packet, because dst_ip not matched: \(register.dstMac)")
|
||
}
|
||
}
|
||
|
||
private func handleRegisterAck(remoteAddress: SocketAddress, registerAck: SDLRegisterAck, source: SDLUDPHoleKind) async {
|
||
// 判断目标地址是否是tun的网卡地址, 并且是在同一个网络下
|
||
let networkAddr = config.networkAddress
|
||
if registerAck.dstMac == networkAddr.mac && registerAck.networkID == networkAddr.networkId {
|
||
if let session = Session(dstMac: registerAck.srcMac, natAddress: remoteAddress, addressType: source.convertAddressType()) {
|
||
await self.sessionManager.addSession(session: session)
|
||
} else {
|
||
SDLLogger.log("[SDLContext] didReadRegisterAck get unsupported remoteAddress: \(remoteAddress)", for: .debug)
|
||
}
|
||
} else {
|
||
SDLLogger.log("[SDLContext] didReadRegisterAck get a invalid packet, because dst_mac not matched: \(registerAck.dstMac)")
|
||
}
|
||
}
|
||
|
||
}
|
||
|
||
// MARK: 和Stun相关的心跳机制
|
||
extension SDLContextActor {
|
||
|
||
// MARK: -- StunRequestTask
|
||
private func startStunRequestTask() async {
|
||
await self.stunRequestWorker?.stop()
|
||
|
||
let stunRequestWorker = PeriodicWorker(
|
||
configuration: .init(
|
||
interval: .seconds(8),
|
||
runImmediately: true,
|
||
mode: .fixedDelay,
|
||
errorPolicy: .keepRunning(delay: .seconds(5))
|
||
),
|
||
operation: { [weak self] in
|
||
let probeReply = try? await self?.ipv6AssistClient?.probe(requestTimeout: .seconds(3))
|
||
|
||
if let v6Info = probeReply?.v6Info, let v6Address = SDLUtil.ipv6DataToString(v6Info.v6) {
|
||
SDLLogger.log("[SDLContext] probe ipv6 address: \(v6Address)")
|
||
} else {
|
||
SDLLogger.log("[SDLContext] probe ipv6 address: empty")
|
||
}
|
||
|
||
await self?.sendStunRequest(v6Info: probeReply?.v6Info)
|
||
},
|
||
onError: { err in
|
||
SDLLogger.log("[SDLContext] udp stunRequestTask stop with err: \(err)")
|
||
}
|
||
)
|
||
self.stunRequestWorker = stunRequestWorker
|
||
await stunRequestWorker.start()
|
||
}
|
||
|
||
private func sendStunRequest(v6Info: SDLV6Info?) async {
|
||
guard let sessionToken = self.sessionToken else {
|
||
return
|
||
}
|
||
|
||
var stunRequest = SDLStunRequest()
|
||
stunRequest.clientID = self.config.clientId
|
||
stunRequest.networkID = self.config.networkAddress.networkId
|
||
stunRequest.ip = self.config.networkAddress.ip
|
||
stunRequest.mac = self.config.networkAddress.mac
|
||
stunRequest.natType = UInt32(self.natType.rawValue)
|
||
stunRequest.sessionToken = sessionToken
|
||
|
||
if let v6Info {
|
||
stunRequest.v6Info = v6Info
|
||
}
|
||
|
||
if let stunData = try? stunRequest.serializedData() {
|
||
await self.sendSuperPacket(type: .stunRequest, data: stunData)
|
||
}
|
||
}
|
||
}
|
||
|
||
// MARK: NEPacketTunnelProvider相关的逻辑
|
||
extension SDLContextActor {
|
||
|
||
// 取消出口节点的时候，ip地址为: 0.0.0.0
|
||
public func updateExitNode(exitNodeIp: String) async throws {
|
||
if let ip = SDLUtil.ipv4StrToInt32(exitNodeIp), ip > 0 {
|
||
self.config.exitNode = .init(exitNodeIp: ip)
|
||
} else {
|
||
self.config.exitNode = nil
|
||
}
|
||
await self.packetOutboundActor.updateRuntime(config: self.config, dataCipher: self.dataCipher)
|
||
await self.packetInboundActor.updateRuntime(config: self.config, dataCipher: self.dataCipher)
|
||
|
||
try await self.tunNetworkManager.apply(settings: .init(config: self.config), dnsServer: DNSHelper.dnsServer)
|
||
}
|
||
|
||
}
|