582 lines
23 KiB
Swift
582 lines
23 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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actor SDLContextActor {
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nonisolated let 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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nonisolated let aesCipher: AESCipher
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// aes
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private var aesKey: Data?
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// rsa的相关配置, public_key是本地生成的
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nonisolated let rsaCipher: RSACipher
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// 依赖的变量
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private var udpHole: SDLUDPHole?
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private var udpHoleWorkers: [Task<Void, Never>]?
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nonisolated let providerAdapter: SDLTunnelProviderAdapter
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var puncherActor: SDLPuncherActor?
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// dns的client对象
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private var dnsClient: SDLDNSClient?
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private var dnsWorker: Task<Void, Never>?
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// 网络探测对象
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var proberActor: SDLNATProberActor?
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// 数据包读取任务
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private var readTask: Task<(), Never>?
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private var sessionManager: SessionManager
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private var arpServer: ArpServer
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// 网络状态变化的健康
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private var monitor: SDLNetworkMonitor?
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private var monitorWorker: Task<Void, Never>?
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// 内部socket通讯
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private var noticeClient: SDLNoticeClient?
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// 流量统计
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nonisolated private let flowTracer = SDLFlowTracer()
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// 处理内部的需要长时间运行的任务
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private var loopChildWorkers: [Task<Void, Never>] = []
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public init(provider: NEPacketTunnelProvider, config: SDLConfiguration, rsaCipher: RSACipher, aesCipher: AESCipher) {
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self.config = config
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self.rsaCipher = rsaCipher
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self.aesCipher = aesCipher
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self.sessionManager = SessionManager()
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self.arpServer = ArpServer(known_macs: [:])
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self.providerAdapter = SDLTunnelProviderAdapter(provider: provider)
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}
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public func start() {
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self.startMonitor()
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self.loopChildWorkers.append(spawnLoop {
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let noticeClient = try self.startNoticeClient()
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SDLLogger.shared.log("[SDLContext] noticeClient running!!!!")
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try await noticeClient.waitClose()
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SDLLogger.shared.log("[SDLContext] noticeClient closed!!!!")
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})
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self.loopChildWorkers.append(spawnLoop {
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let dnsClient = try await self.startDnsClient()
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SDLLogger.shared.log("[SDLContext] dns running!!!!")
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try await dnsClient.waitClose()
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SDLLogger.shared.log("[SDLContext] dns closed!!!!")
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})
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self.loopChildWorkers.append(spawnLoop {
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let udpHole = try await self.startUDPHole()
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SDLLogger.shared.log("[SDLContext] udp running!!!!")
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try await udpHole.waitClose()
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SDLLogger.shared.log("[SDLContext] udp closed!!!!")
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})
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}
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private func startNoticeClient() throws -> SDLNoticeClient {
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// 启动noticeClient
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let noticeClient = try SDLNoticeClient(noticePort: self.config.noticePort, logger: SDLLogger.shared)
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noticeClient.start()
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SDLLogger.shared.log("[SDLContext] noticeClient started")
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self.noticeClient = noticeClient
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return noticeClient
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}
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private func startMonitor() {
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self.monitorWorker?.cancel()
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self.monitorWorker = nil
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// 启动monitor
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let monitor = SDLNetworkMonitor()
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monitor.start()
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SDLLogger.shared.log("[SDLContext] monitor started")
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self.monitor = monitor
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self.monitorWorker = Task.detached {
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for await event in monitor.eventStream {
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switch event {
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case .changed:
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// 需要重新探测网络的nat类型
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//self.natType = await self.getNatType()
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SDLLogger.shared.log("didNetworkPathChanged, nat type is:", level: .info)
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case .unreachable:
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SDLLogger.shared.log("didNetworkPathUnreachable", level: .warning)
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}
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}
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}
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}
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private func startDnsClient() async throws -> SDLDNSClient {
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self.dnsWorker?.cancel()
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self.dnsWorker = nil
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// 启动dns服务
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let dnsSocketAddress = try SocketAddress.makeAddressResolvingHost(self.config.remoteDnsServer, port: 15353)
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let dnsClient = try await SDLDNSClient(dnsServerAddress: dnsSocketAddress, logger: SDLLogger.shared)
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try dnsClient.start()
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SDLLogger.shared.log("[SDLContext] dnsClient started")
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self.dnsClient = dnsClient
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self.dnsWorker = Task.detached {
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// 处理事件流
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for await packet in dnsClient.packetFlow {
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if Task.isCancelled {
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break
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}
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let nePacket = NEPacket(data: packet, protocolFamily: 2)
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self.providerAdapter.writePackets(packets: [nePacket])
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}
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}
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return dnsClient
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}
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private func startUDPHole() async throws -> SDLUDPHole {
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self.udpHoleWorkers?.forEach {$0.cancel()}
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self.udpHoleWorkers = nil
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// 启动udp服务器
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let udpHole = try SDLUDPHole(logger: SDLLogger.shared)
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try udpHole.start()
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SDLLogger.shared.log("[SDLContext] udpHole started")
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self.udpHole = udpHole
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await udpHole.channelIsActived()
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await self.handleUDPHoleReady()
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// 处理心跳逻辑
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let pingTask = Task.detached {
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let (stream, cont) = AsyncStream.makeStream(of: Void.self)
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let timerStream = SDLAsyncTimerStream()
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timerStream.start(cont)
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for await _ in stream {
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if Task.isCancelled {
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break
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}
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SDLLogger.shared.log("[SDLContext] will do stunRequest22")
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await self.sendStunRequest()
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SDLLogger.shared.log("[SDLContext] will do stunRequest44")
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}
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SDLLogger.shared.log("[SDLContext] will do stunRequest55")
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}
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// 处理数据流
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let dataTask = Task.detached {
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for await data in udpHole.dataStream {
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if Task.isCancelled {
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break
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}
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try? await self.handleData(data: data)
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}
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}
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// 处理控制信号
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let signalTask = Task.detached {
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for await(remoteAddress, signal) in udpHole.signalStream {
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if Task.isCancelled {
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break
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}
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switch signal {
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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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await self.puncherActor?.handlePeerInfo(peerInfo: peerInfo)
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case .event(let event):
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try? await self.handleEvent(event: event)
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case .stunProbeReply(let probeReply):
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await self.proberActor?.handleProbeReply(reply: probeReply)
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case .register(let register):
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try? await self.handleRegister(remoteAddress: remoteAddress, register: register)
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case .registerAck(let registerAck):
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await self.handleRegisterAck(remoteAddress: remoteAddress, registerAck: registerAck)
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}
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}
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}
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self.udpHoleWorkers = [pingTask, dataTask, signalTask]
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return udpHole
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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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self.loopChildWorkers.forEach { $0.cancel() }
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self.loopChildWorkers.removeAll()
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self.udpHoleWorkers?.forEach { $0.cancel() }
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self.udpHoleWorkers = nil
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self.dnsWorker?.cancel()
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self.dnsWorker = nil
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self.monitorWorker?.cancel()
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self.monitorWorker = nil
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self.readTask?.cancel()
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self.readTask = nil
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}
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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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// 处理和super的协商问题
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private func handleUDPHoleReady() async {
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guard let udpHole = self.udpHole else {
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return
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}
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self.puncherActor = SDLPuncherActor(udpHole: udpHole, querySocketAddress: config.stunSocketAddress)
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self.proberActor = SDLNATProberActor(udpHole: udpHole, addressArray: self.config.stunProbeSocketAddressArray)
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// 开始探测nat的类型
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Task.detached {
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if let natType = await self.proberActor?.probeNatType() {
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await self.setNatType(natType: natType)
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SDLLogger.shared.log("[SDLContext] nat_type is: \(natType)")
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}
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}
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// 注册
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var registerSuper = SDLRegisterSuper()
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registerSuper.pktID = 0
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registerSuper.clientID = self.config.clientId
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registerSuper.networkID = self.config.networkAddress.networkId
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registerSuper.mac = self.config.networkAddress.mac
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registerSuper.ip = self.config.networkAddress.ip
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registerSuper.maskLen = UInt32(self.config.networkAddress.maskLen)
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registerSuper.hostname = self.config.hostname
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registerSuper.pubKey = self.rsaCipher.pubKey
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registerSuper.accessToken = self.config.accessToken
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if let registerSuperData = try? registerSuper.serializedData() {
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SDLLogger.shared.log("[SDLContext] will send register super")
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self.udpHole?.send(type: .registerSuper, data: registerSuperData, remoteAddress: self.config.stunSocketAddress)
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}
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}
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private func sendStunRequest() {
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var stunRequest = SDLStunRequest()
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stunRequest.clientID = self.config.clientId
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stunRequest.networkID = self.config.networkAddress.networkId
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stunRequest.ip = self.config.networkAddress.ip
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stunRequest.mac = self.config.networkAddress.mac
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stunRequest.natType = UInt32(self.natType.rawValue)
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SDLLogger.shared.log("[SDLContext] will send stun request")
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if let stunData = try? stunRequest.serializedData() {
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let remoteAddress = self.config.stunSocketAddress
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self.udpHole?.send(type: .stunRequest, data: stunData, remoteAddress: remoteAddress)
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}
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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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let aesKey = try! self.rsaCipher.decode(data: Data(registerSuperAck.aesKey))
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SDLLogger.shared.log("[SDLContext] get registerSuperAck, aes_key len: \(aesKey.count)", level: .info)
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// 服务器分配的tun网卡信息
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do {
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let ipAddress = try await self.providerAdapter.setNetworkSettings(networkAddress: self.config.networkAddress, dnsServer: SDLDNSClient.Helper.dnsServer)
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SDLLogger.shared.log("[SDLContext] setNetworkSettings successed")
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self.noticeClient?.send(data: NoticeMessage.ipAdress(ip: ipAddress))
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SDLLogger.shared.log("[SDLContext] send ip successed")
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self.startReader()
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SDLLogger.shared.log("[SDLContext] reader started")
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} catch let err {
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SDLLogger.shared.log("[SDLContext] setTunnelNetworkSettings get error: \(err)", level: .error)
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exit(-1)
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}
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self.aesKey = aesKey
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}
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private func handleRegisterSuperNak(nakPacket: SDLRegisterSuperNak) {
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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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let alertNotice = NoticeMessage.alert(alert: errorMessage)
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self.noticeClient?.send(data: alertNotice)
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exit(-1)
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case .noIpAddress, .networkFault, .internalFault:
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let alertNotice = NoticeMessage.alert(alert: errorMessage)
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self.noticeClient?.send(data: alertNotice)
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}
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SDLLogger.shared.log("[SDLContext] Get a SuperNak message exit", level: .warning)
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}
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private func handleEvent(event: SDLEvent) throws {
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switch event {
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case .natChanged(let natChangedEvent):
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let dstMac = natChangedEvent.mac
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SDLLogger.shared.log("[SDLContext] natChangedEvent, dstMac: \(dstMac)", level: .info)
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sessionManager.removeSession(dstMac: dstMac)
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case .sendRegister(let sendRegisterEvent):
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SDLLogger.shared.log("[SDLContext] sendRegisterEvent, ip: \(sendRegisterEvent)", level: .debug)
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let address = SDLUtil.int32ToIp(sendRegisterEvent.natIp)
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if let remoteAddress = try? SocketAddress.makeAddressResolvingHost(address, port: Int(sendRegisterEvent.natPort)) {
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// 发送register包
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var register = SDLRegister()
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register.networkID = self.config.networkAddress.networkId
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register.srcMac = self.config.networkAddress.mac
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register.dstMac = sendRegisterEvent.dstMac
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self.udpHole?.send(type: .register, data: try register.serializedData(), remoteAddress: remoteAddress)
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}
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case .networkShutdown(let shutdownEvent):
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let alertNotice = NoticeMessage.alert(alert: shutdownEvent.message)
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self.noticeClient?.send(data: alertNotice)
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exit(-1)
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}
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}
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private func handleRegister(remoteAddress: SocketAddress, register: SDLRegister) throws {
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let networkAddr = config.networkAddress
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SDLLogger.shared.log("register packet: \(register), network_address: \(networkAddr)", level: .debug)
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// 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
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if register.dstMac == networkAddr.mac && register.networkID == networkAddr.networkId {
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// 回复ack包
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var registerAck = SDLRegisterAck()
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registerAck.networkID = networkAddr.networkId
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registerAck.srcMac = networkAddr.mac
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registerAck.dstMac = register.srcMac
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self.udpHole?.send(type: .registerAck, data: try registerAck.serializedData(), remoteAddress: remoteAddress)
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// 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
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let session = Session(dstMac: register.srcMac, natAddress: remoteAddress)
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self.sessionManager.addSession(session: session)
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} else {
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SDLLogger.shared.log("SDLContext didReadRegister get a invalid packet, because dst_ip not matched: \(register.dstMac)", level: .warning)
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}
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}
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private func handleRegisterAck(remoteAddress: SocketAddress, registerAck: SDLRegisterAck) {
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// 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
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let networkAddr = config.networkAddress
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if registerAck.dstMac == networkAddr.mac && registerAck.networkID == networkAddr.networkId {
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let session = Session(dstMac: registerAck.srcMac, natAddress: remoteAddress)
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self.sessionManager.addSession(session: session)
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} else {
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SDLLogger.shared.log("SDLContext didReadRegisterAck get a invalid packet, because dst_mac not matched: \(registerAck.dstMac)", level: .warning)
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}
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}
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private func handleData(data: SDLData) throws {
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guard let aesKey = self.aesKey else {
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return
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}
|
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let mac = LayerPacket.MacAddress(data: data.dstMac)
|
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let networkAddr = config.networkAddress
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guard (data.dstMac == networkAddr.mac || mac.isBroadcast() || mac.isMulticast()) else {
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return
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}
|
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guard let decyptedData = try? self.aesCipher.decypt(aesKey: aesKey, data: Data(data.data)) else {
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return
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}
|
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let layerPacket = try LayerPacket(layerData: decyptedData)
|
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|
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self.flowTracer.inc(num: decyptedData.count, type: .inbound)
|
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// 处理arp请求
|
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switch layerPacket.type {
|
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case .arp:
|
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// 判断如果收到的是arp请求
|
||
if let arpPacket = ARPPacket(data: layerPacket.data) {
|
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if arpPacket.targetIP == networkAddr.ip {
|
||
switch arpPacket.opcode {
|
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case .request:
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SDLLogger.shared.log("[SDLContext] get arp request packet", level: .debug)
|
||
let response = ARPPacket.arpResponse(for: arpPacket, mac: networkAddr.mac, ip: networkAddr.ip)
|
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self.routeLayerPacket(dstMac: arpPacket.senderMAC, type: .arp, data: response.marshal())
|
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case .response:
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SDLLogger.shared.log("[SDLContext] get arp response packet", level: .debug)
|
||
self.arpServer.append(ip: arpPacket.senderIP, mac: arpPacket.senderMAC)
|
||
}
|
||
} else {
|
||
SDLLogger.shared.log("[SDLContext] get invalid arp packet: \(arpPacket), target_ip: \(SDLUtil.int32ToIp(arpPacket.targetIP)), net ip: \(SDLUtil.int32ToIp(networkAddr.ip))", level: .debug)
|
||
}
|
||
} else {
|
||
SDLLogger.shared.log("[SDLContext] get invalid arp packet", level: .debug)
|
||
}
|
||
case .ipv4:
|
||
guard let ipPacket = IPPacket(layerPacket.data), ipPacket.header.destination == networkAddr.ip else {
|
||
return
|
||
}
|
||
let packet = NEPacket(data: ipPacket.data, protocolFamily: 2)
|
||
self.providerAdapter.writePackets(packets: [packet])
|
||
default:
|
||
SDLLogger.shared.log("[SDLContext] get invalid packet", level: .debug)
|
||
}
|
||
}
|
||
|
||
|
||
// 流量统计
|
||
// public func flowReportTask() {
|
||
// Task {
|
||
// // 每分钟汇报一次
|
||
// self.flowTracerCancel = Timer.publish(every: 60.0, on: .main, in: .common).autoconnect()
|
||
// .sink { _ in
|
||
// Task {
|
||
// let (forwardNum, p2pNum, inboundNum) = await self.flowTracer.reset()
|
||
// await self.superClient?.flowReport(forwardNum: forwardNum, p2pNum: p2pNum, inboundNum: inboundNum)
|
||
// }
|
||
// }
|
||
// }
|
||
// }
|
||
|
||
// 开始读取数据, 用单独的线程处理packetFlow
|
||
private func startReader() {
|
||
// 停止之前的任务
|
||
self.readTask?.cancel()
|
||
|
||
// 开启新的任务
|
||
self.readTask = Task.detached(priority: .high) {
|
||
while true {
|
||
if Task.isCancelled {
|
||
return
|
||
}
|
||
|
||
let packets = await self.providerAdapter.readPackets()
|
||
let ipPackets = packets.compactMap { IPPacket($0) }
|
||
for ipPacket in ipPackets {
|
||
await self.dealPacket(packet: ipPacket)
|
||
}
|
||
}
|
||
}
|
||
}
|
||
|
||
// 处理读取的每个数据包
|
||
private func dealPacket(packet: IPPacket) {
|
||
let networkAddr = self.config.networkAddress
|
||
if SDLDNSClient.Helper.isDnsRequestPacket(ipPacket: packet) {
|
||
let destIp = packet.header.destination_ip
|
||
SDLLogger.shared.log("[DNSQuery] destIp: \(destIp), int: \(packet.header.destination.asIpAddress())", level: .debug)
|
||
self.dnsClient?.forward(ipPacket: packet)
|
||
return
|
||
}
|
||
|
||
let dstIp = packet.header.destination
|
||
// 本地通讯, 目标地址是本地服务器的ip地址
|
||
if dstIp == networkAddr.ip {
|
||
let nePacket = NEPacket(data: packet.data, protocolFamily: 2)
|
||
self.providerAdapter.writePackets(packets: [nePacket])
|
||
return
|
||
}
|
||
|
||
// 查找arp缓存中是否有目标mac地址
|
||
if let dstMac = self.arpServer.query(ip: dstIp) {
|
||
self.routeLayerPacket(dstMac: dstMac, type: .ipv4, data: packet.data)
|
||
}
|
||
else {
|
||
SDLLogger.shared.log("[SDLContext] dstIp: \(dstIp.asIpAddress()) arp query not found, broadcast", level: .debug)
|
||
// 构造arp广播
|
||
let arpReqeust = ARPPacket.arpRequest(senderIP: networkAddr.ip, senderMAC: networkAddr.mac, targetIP: dstIp)
|
||
self.routeLayerPacket(dstMac: ARPPacket.broadcastMac , type: .arp, data: arpReqeust.marshal())
|
||
}
|
||
}
|
||
|
||
private func routeLayerPacket(dstMac: Data, type: LayerPacket.PacketType, data: Data) {
|
||
let networkAddr = self.config.networkAddress
|
||
// 将数据封装层2层的数据包
|
||
let layerPacket = LayerPacket(dstMac: dstMac, srcMac: networkAddr.mac, type: type, data: data)
|
||
guard let aesKey = self.aesKey, let encodedPacket = try? self.aesCipher.encrypt(aesKey: aesKey, data: layerPacket.marshal()) else {
|
||
return
|
||
}
|
||
|
||
// 构造数据包
|
||
var dataPacket = SDLData()
|
||
dataPacket.networkID = networkAddr.networkId
|
||
dataPacket.srcMac = networkAddr.mac
|
||
dataPacket.dstMac = dstMac
|
||
dataPacket.ttl = 255
|
||
dataPacket.data = encodedPacket
|
||
|
||
let data = try! dataPacket.serializedData()
|
||
// 广播地址不要去尝试打洞
|
||
if ARPPacket.isBroadcastMac(dstMac) {
|
||
// 通过super_node进行转发
|
||
self.udpHole?.send(type: .data, data: data, remoteAddress: self.config.stunSocketAddress)
|
||
}
|
||
else {
|
||
// 通过session发送到对端
|
||
if let session = self.sessionManager.getSession(toAddress: dstMac) {
|
||
SDLLogger.shared.log("[SDLContext] send packet by session: \(session)", level: .debug)
|
||
self.udpHole?.send(type: .data, data: data, remoteAddress: session.natAddress)
|
||
self.flowTracer.inc(num: data.count, type: .p2p)
|
||
}
|
||
else {
|
||
// 通过super_node进行转发
|
||
self.udpHole?.send(type: .data, data: data, remoteAddress: self.config.stunSocketAddress)
|
||
// 流量统计
|
||
self.flowTracer.inc(num: data.count, type: .forward)
|
||
// 尝试打洞
|
||
self.puncherActor?.submitRegisterRequest(request: .init(srcMac: networkAddr.mac, dstMac: dstMac, networkId: networkAddr.networkId))
|
||
}
|
||
}
|
||
}
|
||
|
||
private func spawnLoop(_ body: @escaping () async throws -> Void) -> Task<Void, Never> {
|
||
return Task.detached {
|
||
while !Task.isCancelled {
|
||
do {
|
||
try await body()
|
||
} catch is CancellationError {
|
||
break
|
||
} catch {
|
||
try? await Task.sleep(nanoseconds: 2_000_000_000)
|
||
}
|
||
}
|
||
}
|
||
}
|
||
|
||
deinit {
|
||
self.udpHole = nil
|
||
self.dnsClient = nil
|
||
}
|
||
}
|
||
|
||
private extension UInt32 {
|
||
// 转换成ip地址
|
||
func asIpAddress() -> String {
|
||
return SDLUtil.int32ToIp(self)
|
||
}
|
||
}
|