554 lines
22 KiB
Swift
554 lines
22 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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import Combine
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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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class SDLContext: @unchecked Sendable {
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// 路由信息
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struct Route {
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let dstAddress: String
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let subnetMask: String
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var debugInfo: String {
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return "\(dstAddress):\(subnetMask)"
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}
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}
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let config: SDLConfiguration
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// tun网络地址信息
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var devAddr: SDLDevAddr
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// nat映射的相关信息, 暂时没有用处
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//var natAddress: SDLNatAddress?
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// nat的网络类型
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var natType: SDLNatProber.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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var aesCipher: AESCipher
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// aes
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var aesKey: Data = Data()
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// rsa的相关配置, public_key是本地生成的
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let rsaCipher: RSACipher
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// 依赖的变量
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var udpHole: SDLUDPHole?
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private var udpCancel: AnyCancellable?
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var superClient: SDLSuperClient?
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private var superCancel: AnyCancellable?
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// 数据包读取任务
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private var readTask: Task<(), Never>?
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let provider: NEPacketTunnelProvider
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private var sessionManager: SessionManager
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private var holerManager: HolerManager
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private var arpServer: ArpServer
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// 记录最后发送的stunRequest的cookie
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private var lastCookie: UInt32? = 0
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// 定时器
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private var stunCancel: AnyCancellable?
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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 monitorCancel: AnyCancellable?
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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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private var flowTracer = SDLFlowTracerActor()
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private var flowTracerCancel: AnyCancellable?
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init(provider: NEPacketTunnelProvider, config: SDLConfiguration, rsaCipher: RSACipher, aesCipher: AESCipher) throws {
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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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// 生成mac地址
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var devAddr = SDLDevAddr()
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devAddr.mac = Self.getMacAddress()
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self.devAddr = devAddr
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self.provider = provider
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self.sessionManager = SessionManager()
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self.holerManager = HolerManager()
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self.arpServer = ArpServer(known_macs: [:])
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self.noticeClient = SDLNoticeClient()
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}
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func start() async throws {
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try await self.startSuperClient()
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try await self.startUDPHole()
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self.noticeClient.start()
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// 启动网络监控
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self.monitorCancel = self.monitor.eventFlow.sink { event in
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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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Task {
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self.natType = await SDLNatProber.getNatType(udpHole: self.udpHole, config: self.config)
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NSLog("didNetworkPathChanged, nat type is: \(self.natType)")
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}
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case .unreachable:
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NSLog("didNetworkPathUnreachable")
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}
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}
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self.monitor.start()
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}
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private func startSuperClient() async throws {
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self.superClient = SDLSuperClient(host: config.superHost, port: config.superPort)
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// 建立super的绑定关系
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self.superCancel?.cancel()
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self.superCancel = self.superClient?.eventFlow.sink { event in
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Task {
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await self.handleSuperEvent(event: event)
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}
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}
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try await self.superClient?.start()
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}
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private func handleSuperEvent(event: SDLSuperClient.SuperEvent) async {
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switch event {
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case .ready:
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NSLog("[SDLContext] get registerSuper, mac address: \(Self.formatMacAddress(mac: self.devAddr.mac))")
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guard let message = await self.superClient?.registerSuper(context: self) else {
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return
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}
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switch message.packet {
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case .registerSuperAck(let registerSuperAck):
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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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let upgradeType = SDLUpgradeType(rawValue: registerSuperAck.upgradeType)
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NSLog("[SDLContext] get registerSuperAck, aes_key len: \(aesKey.count)")
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self.devAddr = registerSuperAck.devAddr
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if upgradeType == .force {
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let forceUpgrade = NoticeMessage.UpgradeMessage(prompt: registerSuperAck.upgradePrompt, address: registerSuperAck.upgradeAddress)
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self.noticeClient.send(data: forceUpgrade.binaryData)
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exit(-1)
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}
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// 服务器分配的tun网卡信息
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await self.didNetworkConfigChanged(devAddr: self.devAddr)
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self.aesKey = aesKey
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if upgradeType == .normal {
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let normalUpgrade = NoticeMessage.UpgradeMessage(prompt: registerSuperAck.upgradePrompt, address: registerSuperAck.upgradeAddress)
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self.noticeClient.send(data: normalUpgrade.binaryData)
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}
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case .registerSuperNak(let nakPacket):
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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.AlertMessage(alert: errorMessage)
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self.noticeClient.send(data: alertNotice.binaryData)
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exit(-1)
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case .noIpAddress, .networkFault, .internalFault:
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let alertNotice = NoticeMessage.AlertMessage(alert: errorMessage)
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self.noticeClient.send(data: alertNotice.binaryData)
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}
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SDLLogger.log("Get a SuperNak message exit", level: .error)
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default:
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()
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}
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case .closed:
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SDLLogger.log("[SDLContext] super client closed", level: .debug)
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await self.arpServer.clear()
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DispatchQueue.main.asyncAfter(deadline: .now() + 5) {
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Task {@MainActor in
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try await self.startSuperClient()
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}
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}
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case .event(let evt):
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switch evt {
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case .natChanged(let natChangedEvent):
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let dstMac = natChangedEvent.mac
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NSLog("natChangedEvent, dstMac: \(dstMac)")
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await sessionManager.removeSession(dstMac: dstMac)
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case .sendRegister(let sendRegisterEvent):
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NSLog("sendRegisterEvent, ip: \(sendRegisterEvent)")
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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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self.udpHole?.sendRegister(context: self, remoteAddress: remoteAddress, dst_mac: sendRegisterEvent.dstMac)
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}
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case .networkShutdown(let shutdownEvent):
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let alertNotice = NoticeMessage.AlertMessage(alert: shutdownEvent.message)
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self.noticeClient.send(data: alertNotice.binaryData)
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exit(-1)
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}
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case .command(let packetId, let command):
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switch command {
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case .changeNetwork(let changeNetworkCommand):
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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(changeNetworkCommand.aesKey))
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NSLog("[SDLContext] change network command get aes_key len: \(aesKey.count)")
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self.devAddr = changeNetworkCommand.devAddr
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// 服务器分配的tun网卡信息
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await self.didNetworkConfigChanged(devAddr: self.devAddr)
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self.aesKey = aesKey
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var commandAck = SDLCommandAck()
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commandAck.status = true
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self.superClient?.commandAck(packetId: packetId, ack: commandAck)
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}
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}
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}
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private func startUDPHole() async throws {
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self.udpHole = SDLUDPHole()
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self.udpCancel?.cancel()
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self.udpCancel = self.udpHole?.eventFlow.sink { event in
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Task.detached {
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await self.handleUDPEvent(event: event)
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}
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}
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try await self.udpHole?.start()
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}
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private func handleUDPEvent(event: SDLUDPHole.UDPEvent) async {
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switch event {
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case .ready:
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// 获取当前网络的类型
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self.natType = await SDLNatProber.getNatType(udpHole: self.udpHole, config: self.config)
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SDLLogger.log("[SDLContext] nat type is: \(self.natType)", level: .debug)
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let timer = Timer.publish(every: 5.0, on: .main, in: .common).autoconnect()
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self.stunCancel = Just(Date()).merge(with: timer).sink { _ in
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self.lastCookie = self.udpHole?.stunRequest(context: self)
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}
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case .closed:
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DispatchQueue.main.asyncAfter(deadline: .now() + 5) {
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Task {
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try await self.startUDPHole()
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}
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}
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case .message(let remoteAddress, let message):
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switch message {
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case .register(let register):
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NSLog("register packet: \(register), dev_addr: \(self.devAddr)")
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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 == self.devAddr.mac && register.networkID == self.devAddr.networkID {
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// 回复ack包
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self.udpHole?.sendRegisterAck(context: self, remoteAddress: remoteAddress, dst_mac: register.srcMac)
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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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await self.sessionManager.addSession(session: session)
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} else {
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SDLLogger.log("SDLContext didReadRegister get a invalid packet, because dst_ip not matched: \(register.dstMac)", level: .warning)
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}
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case .registerAck(let registerAck):
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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 registerAck.dstMac == self.devAddr.mac && registerAck.networkID == self.devAddr.networkID {
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let session = Session(dstMac: registerAck.srcMac, natAddress: remoteAddress)
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await self.sessionManager.addSession(session: session)
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} else {
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SDLLogger.log("SDLContext didReadRegisterAck get a invalid packet, because dst_mac not matched: \(registerAck.dstMac)", level: .warning)
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}
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case .stunReply(let stunReply):
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let cookie = stunReply.cookie
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if cookie == self.lastCookie {
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// 记录下当前在nat上的映射信息，暂时没有用；后续会用来判断网络类型
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//self.natAddress = stunReply.natAddress
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SDLLogger.log("[SDLContext] get a stunReply: \(try! stunReply.jsonString())")
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}
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default:
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()
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}
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case .data(let data):
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let mac = LayerPacket.MacAddress(data: data.dstMac)
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guard (data.dstMac == self.devAddr.mac || mac.isBroadcast() || mac.isMulticast()) else {
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NSLog("[SDLContext] didReadData 1")
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return
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}
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guard let decyptedData = try? self.aesCipher.decypt(aesKey: self.aesKey, data: Data(data.data)) else {
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NSLog("[SDLContext] didReadData 2")
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return
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}
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do {
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let layerPacket = try LayerPacket(layerData: decyptedData)
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await 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
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if let arpPacket = ARPPacket(data: layerPacket.data) {
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if arpPacket.targetIP == self.devAddr.netAddr {
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switch arpPacket.opcode {
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case .request:
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NSLog("[SDLContext] get arp request packet")
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let response = ARPPacket.arpResponse(for: arpPacket, mac: self.devAddr.mac, ip: self.devAddr.netAddr)
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await self.routeLayerPacket(dstMac: arpPacket.senderMAC, type: .arp, data: response.marshal())
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case .response:
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NSLog("[SDLContext] get arp response packet")
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await self.arpServer.append(ip: arpPacket.senderIP, mac: arpPacket.senderMAC)
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}
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} else {
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NSLog("[SDLContext] get invalid arp packet, target_ip: \(arpPacket)")
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}
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} else {
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NSLog("[SDLContext] get invalid arp packet")
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}
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case .ipv4:
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NSLog("[SDLContext] get ipv4 packet")
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guard let ipPacket = IPPacket(layerPacket.data), ipPacket.header.destination == self.devAddr.netAddr else {
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return
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}
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let packet = NEPacket(data: ipPacket.data, protocolFamily: 2)
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self.provider.packetFlow.writePacketObjects([packet])
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default:
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NSLog("[SDLContext] get invalid packet")
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}
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} catch let err {
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NSLog("[SDLContext] didReadData err: \(err)")
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}
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}
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}
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// 流量统计
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func flowReportTask() {
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Task {
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// 每分钟汇报一次
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self.flowTracerCancel = Timer.publish(every: 60.0, on: .main, in: .common).autoconnect()
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.sink { _ in
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Task {
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let (forwardNum, p2pNum, inboundNum) = await self.flowTracer.reset()
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self.superClient?.flowReport(forwardNum: forwardNum, p2pNum: p2pNum, inboundNum: inboundNum)
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}
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}
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}
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}
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// 网络改变时需要重新配置网络信息
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private func didNetworkConfigChanged(devAddr: SDLDevAddr, dnsServers: [String]? = nil) async {
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let netAddress = SDLNetAddress(ip: devAddr.netAddr, maskLen: UInt8(devAddr.netBitLen))
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let routes = [Route(dstAddress: netAddress.networkAddress, subnetMask: netAddress.maskAddress)]
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// Add code here to start the process of connecting the tunnel.
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let networkSettings = NEPacketTunnelNetworkSettings(tunnelRemoteAddress: "8.8.8.8")
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networkSettings.mtu = 1460
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// 设置网卡的DNS解析
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if let dnsServers {
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networkSettings.dnsSettings = NEDNSSettings(servers: dnsServers)
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} else {
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networkSettings.dnsSettings = NEDNSSettings(servers: ["8.8.8.8", "114.114.114.114"])
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}
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let ipv4Settings = NEIPv4Settings(addresses: [netAddress.ipAddress], subnetMasks: [netAddress.maskAddress])
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// 设置路由表
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//NEIPv4Route.default()
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ipv4Settings.includedRoutes = routes.map { route in
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NEIPv4Route(destinationAddress: route.dstAddress, subnetMask: route.subnetMask)
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}
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networkSettings.ipv4Settings = ipv4Settings
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// 网卡配置设置必须成功
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do {
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try await self.provider.setTunnelNetworkSettings(networkSettings)
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await self.holerManager.cleanup()
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self.startReader()
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} catch let err {
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SDLLogger.log("[SDLContext] setTunnelNetworkSettings get error: \(err)", level: .error)
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exit(-1)
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}
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}
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// 开始读取数据, 用单独的线程处理packetFlow
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private func startReader() {
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// 停止之前的任务
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self.readTask?.cancel()
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// 开启新的任务
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self.readTask = Task(priority: .high) {
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repeat {
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if Task.isCancelled {
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break
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}
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let (packets, numbers) = await self.provider.packetFlow.readPackets()
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for (data, number) in zip(packets, numbers) where number == 2 {
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if let packet = IPPacket(data) {
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Task.detached {
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let dstIp = packet.header.destination
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// 本地通讯, 目标地址是本地服务器的ip地址
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if dstIp == self.devAddr.netAddr {
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let nePacket = NEPacket(data: packet.data, protocolFamily: 2)
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self.provider.packetFlow.writePacketObjects([nePacket])
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return
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}
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// 查找arp缓存中是否有目标mac地址
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if let dstMac = await self.arpServer.query(ip: dstIp) {
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await self.routeLayerPacket(dstMac: dstMac, type: .ipv4, data: packet.data)
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}
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else {
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// 构造arp请求
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let broadcastMac = Data([0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF])
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let arpReqeust: ARPPacket = ARPPacket.arpRequest(senderIP: self.devAddr.netAddr, senderMAC: self.devAddr.mac, targetIP: dstIp)
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await self.routeLayerPacket(dstMac: broadcastMac, type: .arp, data: arpReqeust.marshal())
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NSLog("[SDLContext] dstIp: \(dstIp) arp query not found")
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}
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}
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}
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}
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} while true
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}
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}
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private func routeLayerPacket(dstMac: Data, type: LayerPacket.PacketType, data: Data) async {
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// 将数据封装层2层的数据包
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let layerPacket = LayerPacket(dstMac: dstMac, srcMac: self.devAddr.mac, type: type, data: data)
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guard let encodedPacket = try? self.aesCipher.encrypt(aesKey: self.aesKey, data: layerPacket.marshal()) else {
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return
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}
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// 通过session发送到对端
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if let session = await self.sessionManager.getSession(toAddress: dstMac) {
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NSLog("[SDLContext] send packet by session: \(session)")
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self.udpHole?.sendPacket(context: self, session: session, data: encodedPacket)
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await self.flowTracer.inc(num: data.count, type: .p2p)
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} else {
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// 通过super_node进行转发
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self.udpHole?.forwardPacket(context: self, dst_mac: dstMac, data: encodedPacket)
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// 流量统计
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await self.flowTracer.inc(num: data.count, type: .forward)
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// 尝试打洞
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await self.holerManager.addHoler(dstMac: dstMac) {
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self.holerTask(dstMac: dstMac)
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}
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}
|
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}
|
||
|
||
func holerTask(dstMac: Data) -> Task<(), Never> {
|
||
return Task {
|
||
guard let message = try? await self.superClient?.queryInfo(context: self, dst_mac: dstMac) else {
|
||
return
|
||
}
|
||
|
||
switch message.packet {
|
||
case .empty:
|
||
SDLLogger.log("[SDLContext] hole query_info get empty: \(message)", level: .debug)
|
||
case .peerInfo(let peerInfo):
|
||
if let remoteAddress = peerInfo.v4Info.socketAddress() {
|
||
SDLLogger.log("[SDLContext] hole sock address: \(remoteAddress)", level: .warning)
|
||
// 发送register包
|
||
self.udpHole?.sendRegister(context: self, remoteAddress: remoteAddress, dst_mac: dstMac)
|
||
} else {
|
||
SDLLogger.log("[SDLContext] hole sock address is invalid: \(peerInfo.v4Info)", level: .warning)
|
||
}
|
||
default:
|
||
SDLLogger.log("[SDLContext] hole query_info is packet: \(message)", level: .warning)
|
||
}
|
||
}
|
||
}
|
||
|
||
deinit {
|
||
self.stunCancel?.cancel()
|
||
self.udpHole = nil
|
||
self.superClient = nil
|
||
}
|
||
|
||
}
|
||
|
||
//--MARK: 获取设备的UUID
|
||
|
||
extension SDLContext {
|
||
|
||
static func getUUID() -> String {
|
||
let userDefaults = UserDefaults.standard
|
||
if let uuid = userDefaults.value(forKey: "gClientId") as? String {
|
||
return uuid
|
||
} else {
|
||
let uuid = UUID().uuidString.replacingOccurrences(of: "-", with: "").lowercased()
|
||
userDefaults.setValue(uuid, forKey: "gClientId")
|
||
|
||
return uuid
|
||
}
|
||
}
|
||
|
||
// 获取mac地址
|
||
static func getMacAddress() -> Data {
|
||
let key = "gMacAddress2"
|
||
|
||
let userDefaults = UserDefaults.standard
|
||
if let mac = userDefaults.value(forKey: key) as? Data {
|
||
return mac
|
||
}
|
||
else {
|
||
let mac = generateMacAddress()
|
||
userDefaults.setValue(mac, forKey: key)
|
||
|
||
return mac
|
||
}
|
||
}
|
||
|
||
// 随机生成mac地址
|
||
private static func generateMacAddress() -> Data {
|
||
var macAddress = [UInt8](repeating: 0, count: 6)
|
||
for i in 0..<6 {
|
||
macAddress[i] = UInt8.random(in: 0...255)
|
||
}
|
||
|
||
return Data(macAddress)
|
||
}
|
||
|
||
// 将mac地址转换成字符串
|
||
private static func formatMacAddress(mac: Data) -> String {
|
||
let bytes = [UInt8](mac)
|
||
|
||
return bytes.map { String(format: "%02X", $0) }.joined(separator: ":").lowercased()
|
||
}
|
||
|
||
}
|