916 lines
37 KiB
Swift
916 lines
37 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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enum State {
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case unregistered
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case registered
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}
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private var state: State = .unregistered
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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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// 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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// dns的client对象
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private var dnsClient: DNSCloudClient?
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private var dnsWorker: Task<Void, Never>?
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// Localdns的client对象
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private var dnsLocalClient: DNSLocalClient?
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private var dnsLocalWorker: Task<Void, Never>?
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private var quicClient: SDLQUICClient?
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private var quicWorker: Task<Void, Never>?
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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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// 数据包读取任务
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private var readTask: Task<(), Never>?
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nonisolated private let sessionManager = SessionManager()
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nonisolated private let 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 supervisor = SDLSupervisor()
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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 identifyStore: IdentityStore
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private var updatePolicyTask: Task<Void, Never>?
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private let snapshotPublisher: SnapshotPublisher<IdentitySnapshot>
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// Flow流会话管理， 过期时间为: 180秒
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private let flowSessionManager = SDLFlowSessionManager(sessionTimeout: 180)
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// 注册任务
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private var registerTask: Task<Void, Never>?
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public init(provider: NEPacketTunnelProvider, config: SDLConfiguration, rsaCipher: RSACipher) {
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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 = SDLPuncherActor()
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self.proberActor = SDLNATProberActor(addressArray: config.stunProbeSocketAddressArray)
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self.arpServer = ArpServer()
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// 权限控制
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let snapshotPublisher = SnapshotPublisher(initial: IdentitySnapshot.empty())
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self.identifyStore = IdentityStore(publisher: snapshotPublisher)
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self.snapshotPublisher = snapshotPublisher
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}
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public func start() async {
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self.startMonitor()
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// 启动arp的定时清理任务
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await self.arpServer.start()
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await self.startDnsClient()
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await self.startDnsLocalClient()
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await self.supervisor.addWorker(name: "quicClient") {
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SDLLogger.log("[SDLContext] try start quicClient", for: .debug)
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let quicClient = try await self.startQUICClient()
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SDLLogger.log("[SDLContext] quicClient running!!!!")
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await quicClient.waitClose()
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SDLLogger.log("[SDLContext] quicClient closed!!!!")
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}
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await self.supervisor.addWorker(name: "noticeClient") {
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let noticeClient = try self.startNoticeClient()
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SDLLogger.log("[SDLContext] noticeClient running!!!!")
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try await noticeClient.waitClose()
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SDLLogger.log("[SDLContext] noticeClient closed!!!!")
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}
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await self.supervisor.addWorker(name: "udpHole") {
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let udpHole = try await self.startUDPHole()
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SDLLogger.log("[SDLContext] udp running!!!!")
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try await udpHole.waitClose()
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SDLLogger.log("[SDLContext] udp closed!!!!")
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}
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}
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// 取消出口节点的时候，ip地址为: 0.0.0.0
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public func updateExitNode(exitNodeIp: String) async throws {
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if let ip = SDLUtil.ipv4StrToInt32(exitNodeIp), ip > 0 {
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self.config.exitNode = .init(exitNodeIp: ip)
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} else {
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self.config.exitNode = nil
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}
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try await self.setNetworkSettings(config: config, dnsServer: DNSHelper.dnsServer)
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}
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private func startQUICClient() async throws -> SDLQUICClient {
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self.quicWorker?.cancel()
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self.quicClient?.stop()
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// 启动monitor
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let quicClient = SDLQUICClient(host: self.config.serverHost, port: 443)
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quicClient.start()
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// 等待quic准备好
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try await quicClient.waitReady()
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// 这里必须等待quic的协商完成
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try await Task.sleep(for: .seconds(0.2))
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SDLLogger.log("[SDLContext] start quic client: \(self.config.serverHost)")
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self.quicWorker = Task.detached {
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for await message in quicClient.messageStream {
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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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// 注册
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await self.startRegisterLoop()
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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.shared.log("[SDLContext] peer message: \(peerInfo)")
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await self.puncherActor.handlePeerInfo(using: self.udpHole, peerInfo: peerInfo)
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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.identifyStore.applyPolicyResponse(policyResponse)
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case .arpResponse(let arpResponse):
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//SDLLogger.shared.log("[SDLContext] get arp response: \(arpResponse)")
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await self.arpServer.handleArpResponse(arpResponse: arpResponse)
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}
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}
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}
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self.quicClient = quicClient
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return quicClient
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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)
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noticeClient.start()
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SDLLogger.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.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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await self.probeNatType()
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SDLLogger.log("didNetworkPathChanged, nat type is:")
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case .unreachable:
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SDLLogger.log("didNetworkPathUnreachable")
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}
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}
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}
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}
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private func startDnsClient() async {
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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 dnsClient = DNSCloudClient(host: self.config.serverIp, port: 15353)
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dnsClient.start()
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SDLLogger.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.provider.packetFlow.writePacketObjects([nePacket])
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}
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}
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}
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private func startDnsLocalClient() async {
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self.dnsLocalWorker?.cancel()
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self.dnsLocalWorker = nil
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// 启动dns服务
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let dnsLocalClient = DNSLocalClient()
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dnsLocalClient.start()
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SDLLogger.log("[SDLContext] dnsClient started")
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self.dnsLocalClient = dnsLocalClient
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self.dnsLocalWorker = Task.detached {
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// 处理事件流
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for await packet in dnsLocalClient.packetFlow {
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if Task.isCancelled {
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break
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}
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// 要想办法构造一个完整的Ip包
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let nePacket = NEPacket(data: packet, protocolFamily: 2)
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self.provider.packetFlow.writePacketObjects([nePacket])
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}
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}
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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()
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try udpHole.start()
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SDLLogger.log("[SDLContext] udpHole started")
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// 获取当前udp启动的地址
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let localAddress = udpHole.getLocalAddress()
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// 阻塞等待udpHole是准备好的状态
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await udpHole.channelIsActived()
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// 处理心跳逻辑
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let pingTask = Task.detached {
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let timerStream = SDLAsyncTimerStream()
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timerStream.start(interval: .seconds(5))
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for await _ in timerStream.stream {
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if Task.isCancelled {
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break
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}
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await self.sendStunRequest()
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}
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SDLLogger.log("[SDLContext] udp pingTask cancel")
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}
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// 处理消息流
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let messageTask = Task.detached {
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for await (remoteAddress, message) in udpHole.messageStream {
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if Task.isCancelled {
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break
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}
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switch message {
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case .stunProbeReply(let probeReply):
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await self.proberActor.handleProbeReply(localAddress: localAddress, 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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case .data(let data):
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do {
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try await self.handleHoleData(data: data)
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} catch let err {
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SDLLogger.log("[SDLContext] handleHoleData get err: \(err)")
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}
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case .stunReply(_):
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//SDLLogger.shared.log("[SDLContext] get a stunReply: \(stunReply)")
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()
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}
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}
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SDLLogger.log("[SDLContext] udp signalTask cancel")
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}
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self.udpHole = udpHole
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self.udpHoleWorkers = [pingTask, messageTask]
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// 开始探测nat的类型
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await self.probeNatType()
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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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await self.supervisor.stop()
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self.udpHoleWorkers?.forEach { $0.cancel() }
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self.udpHoleWorkers = nil
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self.quicWorker?.cancel()
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self.quicWorker = nil
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self.dnsClient?.stop()
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self.dnsWorker?.cancel()
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self.dnsWorker = nil
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self.dnsLocalClient?.stop()
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self.dnsLocalWorker?.cancel()
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self.dnsLocalWorker = 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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self.registerTask?.cancel()
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self.registerTask = nil
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self.updatePolicyTask?.cancel()
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self.updatePolicyTask = 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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// 开启注册任务
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private func startRegisterLoop() {
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guard self.registerTask == nil else {
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return
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}
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self.registerTask = Task {
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while !Task.isCancelled {
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self.doRegisterSuper()
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try? await Task.sleep(for: .seconds(5))
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if self.state == .registered {
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await self.whenRegistedSuper()
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break
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}
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SDLLogger.log("[SDLContext] register super failed, retry")
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}
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self.registerTask = nil
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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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self.updatePolicyTask?.cancel()
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self.updatePolicyTask = Task {
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while !Task.isCancelled {
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try? await Task.sleep(for: .seconds(300))
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SDLLogger.log("[SDLContext] updatePolicyTask execute")
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await self.identifyStore.batUpdatePolicy(using: self.quicClient, dstIdentityID: self.config.identityId)
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}
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}
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}
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private func sendStunRequest() {
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guard let sessionToken = self.sessionToken else {
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return
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}
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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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stunRequest.sessionToken = sessionToken
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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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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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self.provider.cancelTunnelWithError(SDLError.invalidKey)
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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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self.provider.cancelTunnelWithError(SDLError.unsupportedAlgorithm(algorithm: algorithm))
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return
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}
|
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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.setNetworkSettings(config: self.config, dnsServer: DNSHelper.dnsServer)
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SDLLogger.log("[SDLContext] setNetworkSettings successed")
|
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self.state = .registered
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self.startReader()
|
||
} catch let err {
|
||
SDLLogger.log("[SDLContext] setTunnelNetworkSettings get error: \(err)")
|
||
self.provider.cancelTunnelWithError(err)
|
||
}
|
||
}
|
||
|
||
private func handleRegisterSuperNak(nakPacket: SDLRegisterSuperNak) {
|
||
let errorMessage = nakPacket.errorMessage
|
||
guard let errorCode = SDLNAKErrorCode(rawValue: UInt8(nakPacket.errorCode)) else {
|
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return
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||
}
|
||
|
||
switch errorCode {
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case .invalidToken, .nodeDisabled:
|
||
let alertNotice = NoticeMessage.alert(alert: errorMessage)
|
||
self.noticeClient?.send(data: alertNotice)
|
||
// 报告错误并退出
|
||
let error = NSError(domain: "com.jihe.punchnet.tun", code: -1)
|
||
self.provider.cancelTunnelWithError(error)
|
||
|
||
case .noIpAddress, .networkFault, .internalFault:
|
||
let alertNotice = NoticeMessage.alert(alert: errorMessage)
|
||
self.noticeClient?.send(data: alertNotice)
|
||
}
|
||
SDLLogger.log("[SDLContext] Get a SuperNak message exit")
|
||
|
||
}
|
||
|
||
private func handleEvent(event: SDLEvent) async {
|
||
switch event.event {
|
||
case .natChanged(let natChangedEvent):
|
||
let dstMac = natChangedEvent.mac
|
||
SDLLogger.log("[SDLContext] natChangedEvent, dstMac: \(dstMac)")
|
||
sessionManager.removeSession(dstMac: dstMac)
|
||
case .sendRegister(let sendRegisterEvent):
|
||
SDLLogger.log("[SDLContext] sendRegisterEvent, ip: \(sendRegisterEvent)")
|
||
let address = SDLUtil.int32ToIp(sendRegisterEvent.natIp)
|
||
if let remoteAddress = try? SocketAddress.makeAddressResolvingHost(address, port: Int(sendRegisterEvent.natPort)) {
|
||
// 发送register包
|
||
var register = SDLRegister()
|
||
register.networkID = self.config.networkAddress.networkId
|
||
register.srcMac = self.config.networkAddress.mac
|
||
register.dstMac = sendRegisterEvent.dstMac
|
||
self.udpHole?.send(type: .register, data: try! register.serializedData(), remoteAddress: remoteAddress)
|
||
}
|
||
case .shutdown(let shutdownEvent):
|
||
let alertNotice = NoticeMessage.alert(alert: shutdownEvent.message)
|
||
self.noticeClient?.send(data: alertNotice)
|
||
|
||
// 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() {
|
||
// 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")
|
||
self.quicClient?.send(type: .registerSuper, data: registerSuperData)
|
||
}
|
||
}
|
||
|
||
private func handleRegister(remoteAddress: SocketAddress, register: SDLRegister) 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
|
||
|
||
self.udpHole?.send(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
|
||
let session = Session(dstMac: register.srcMac, natAddress: remoteAddress)
|
||
self.sessionManager.addSession(session: session)
|
||
} else {
|
||
SDLLogger.log("[SDLContext] didReadRegister get a invalid packet, because dst_ip not matched: \(register.dstMac)")
|
||
}
|
||
}
|
||
|
||
private func handleRegisterAck(remoteAddress: SocketAddress, registerAck: SDLRegisterAck) {
|
||
// 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 {
|
||
let session = Session(dstMac: registerAck.srcMac, natAddress: remoteAddress)
|
||
self.sessionManager.addSession(session: session)
|
||
} else {
|
||
SDLLogger.log("[SDLContext] didReadRegisterAck get a invalid packet, because dst_mac not matched: \(registerAck.dstMac)")
|
||
}
|
||
}
|
||
|
||
private func handleHoleData(data: SDLData) async throws {
|
||
guard let dataCipher = self.dataCipher else {
|
||
return
|
||
}
|
||
|
||
let mac = LayerPacket.MacAddress(data: data.dstMac)
|
||
let networkAddr = config.networkAddress
|
||
guard (data.dstMac == networkAddr.mac || mac.isBroadcast() || mac.isMulticast()) else {
|
||
return
|
||
}
|
||
|
||
let decyptedData = try dataCipher.decrypt(cipherText: Data(data.data))
|
||
let layerPacket = try LayerPacket(layerData: decyptedData)
|
||
|
||
self.flowTracer.inc(num: decyptedData.count, type: .inbound)
|
||
// 处理arp请求
|
||
switch layerPacket.type {
|
||
case .arp:
|
||
// 判断如果收到的是arp请求
|
||
if let arpPacket = ARPPacket(data: layerPacket.data) {
|
||
if arpPacket.targetIP == networkAddr.ip {
|
||
switch arpPacket.opcode {
|
||
case .request:
|
||
SDLLogger.log("[SDLContext] get arp request packet")
|
||
let response = ARPPacket.arpResponse(for: arpPacket, mac: networkAddr.mac, ip: networkAddr.ip)
|
||
await self.routeLayerPacket(dstMac: arpPacket.senderMAC, type: .arp, data: response.marshal())
|
||
case .response:
|
||
SDLLogger.log("[SDLContext] get arp response packet")
|
||
await self.arpServer.append(ip: arpPacket.senderIP, mac: arpPacket.senderMAC)
|
||
}
|
||
} else {
|
||
SDLLogger.log("[SDLContext] get invalid arp packet: \(arpPacket), target_ip: \(SDLUtil.int32ToIp(arpPacket.targetIP)), net ip: \(SDLUtil.int32ToIp(networkAddr.ip))")
|
||
}
|
||
} else {
|
||
SDLLogger.log("[SDLContext] get invalid arp packet")
|
||
}
|
||
case .ipv4:
|
||
// 有数据是通过出口网关转发的，所有只判断是合法的ip包
|
||
guard let ipPacket = IPPacket(layerPacket.data) else {
|
||
return
|
||
}
|
||
|
||
// 检查权限逻辑
|
||
let identitySnapshot = self.snapshotPublisher.current()
|
||
let ruleMap = identitySnapshot.lookup(data.identityID)
|
||
|
||
if true || self.checkPolicy(ipPacket: ipPacket, ruleMap: ruleMap) {
|
||
// 用来做debug
|
||
if ipPacket.header.source == 168428037 {
|
||
SDLLogger.log("[SDLContext] hole data: \(Array(ipPacket.data)), len: \(ipPacket.data.count)", for: .trace)
|
||
}
|
||
|
||
let packet = NEPacket(data: ipPacket.data, protocolFamily: 2)
|
||
self.provider.packetFlow.writePacketObjects([packet])
|
||
SDLLogger.log("[SDLContext] hole identity: \(data.identityID), allow, data count: \(ipPacket.data.count)", for: .trace)
|
||
}
|
||
else {
|
||
SDLLogger.log("[SDLContext] not found identity: \(data.identityID) ruleMap", for: .debug)
|
||
// 向服务器请求权限逻辑
|
||
await self.identifyStore.policyRequest(srcIdentityId: data.identityID, dstIdentityId: self.config.identityId, using: self.quicClient)
|
||
}
|
||
default:
|
||
SDLLogger.log("[SDLContext] get invalid packet", for: .debug)
|
||
}
|
||
}
|
||
|
||
private func checkPolicy(ipPacket: IPPacket, ruleMap: IdentityRuleMap?) -> Bool {
|
||
// 进来的数据反转一下，然后再处理
|
||
if let reverseFlowSession = ipPacket.flowSession()?.reverse(),
|
||
self.flowSessionManager.hasSession(reverseFlowSession) {
|
||
self.flowSessionManager.updateSession(reverseFlowSession)
|
||
return true
|
||
}
|
||
|
||
// 检查权限逻辑
|
||
let proto = ipPacket.header.proto
|
||
// 优先判断访问规则
|
||
switch ipPacket.transportPacket {
|
||
case .tcp(let tcpPacket):
|
||
if let ruleMap, ruleMap.isAllow(proto: proto, port: tcpPacket.header.dstPort) {
|
||
return true
|
||
}
|
||
case .udp(let udpPacket):
|
||
if let ruleMap, ruleMap.isAllow(proto: proto, port: udpPacket.dstPort) {
|
||
return true
|
||
}
|
||
case .icmp(_):
|
||
return true
|
||
default:
|
||
return false
|
||
}
|
||
|
||
return false
|
||
}
|
||
|
||
// 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, numbers) = await self.provider.packetFlow.readPackets()
|
||
for (data, number) in zip(packets, numbers) where number == 2 {
|
||
SDLLogger.log("[SDLContext] read Tun packet step 1, data count: \(data.count)", for: .trace)
|
||
if let ipPacket = IPPacket(data) {
|
||
SDLLogger.log("[SDLContext] read Tun packet step 2, data count: \(ipPacket.data.count)", for: .trace)
|
||
await self.dealTunPacket(packet: ipPacket)
|
||
}
|
||
}
|
||
}
|
||
}
|
||
}
|
||
|
||
// 处理读取的每个数据包
|
||
private func dealTunPacket(packet: IPPacket) async {
|
||
let networkAddr = self.config.networkAddress
|
||
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.provider.packetFlow.writePacketObjects([nePacket])
|
||
}
|
||
// 处理dns的解析
|
||
else if DNSHelper.isDnsRequestPacket(ipPacket: packet), case .udp(let udpPacket) = packet.transportPacket {
|
||
// 数据是通过offset解析的, dns查询必然是udp包
|
||
let payloadOffset = udpPacket.payloadOffset
|
||
let dnsParser = DNSParser(data: packet.data, offset: payloadOffset)
|
||
if let dnsMessage = dnsParser.parse(), let name = dnsMessage.questions.first?.name {
|
||
// 如果是内部域名，则转发整个ip包的内容到云端服务器
|
||
if name.contains(self.config.networkAddress.networkDomain) {
|
||
SDLLogger.log("[SDLContext] get cloud dns request: \(name)")
|
||
self.dnsClient?.forward(ipPacketData: packet.data)
|
||
}
|
||
// 通过本地的dns解析，发送的是udp的payload部分
|
||
else {
|
||
// 尝试解析下对不对
|
||
let dnsPayload = Data(packet.data[payloadOffset..<packet.data.count])
|
||
SDLLogger.log("[SDLContext] get local dns request: \(name)")
|
||
|
||
let tracker = DNSLocalClient.DNSTracker(transactionID: dnsMessage.transactionID,
|
||
clientIP: packet.header.source,
|
||
clientPort: udpPacket.srcPort,
|
||
createdAt: Date())
|
||
self.dnsLocalClient?.query(tracker: tracker, dnsPayload: dnsPayload)
|
||
}
|
||
}
|
||
}
|
||
else {
|
||
// 外部出去的数据，需要建立FlowSession
|
||
// 外部数据进来的时候需要查找
|
||
if let flowSession = packet.flowSession() {
|
||
self.flowSessionManager.updateSession(flowSession)
|
||
//SDLLogger.shared.log("[SDLContext] flow_session: \(flowSession)", level: .debug)
|
||
}
|
||
|
||
// 判断目标地址是否和当前的网络地址是否在同一个网段
|
||
// 只有在同一个网段的ip数据才直接发送
|
||
if SDLUtil.inSameNetwork(ip: dstIp, compareIp: networkAddr.ip, maskLen: networkAddr.maskLen) {
|
||
SDLLogger.log("[SDLContext] read Tun packet step 3, data: \(Array(packet.data))", for: .trace)
|
||
// 查找arp缓存中是否有目标mac地址
|
||
if let dstMac = await self.arpServer.query(ip: dstIp) {
|
||
SDLLogger.log("[SDLContext] dstIp: \(dstIp.asIpAddress()), dst_mac is: \(SDLUtil.formatMacAddress(mac: dstMac))", for: .trace)
|
||
await self.routeLayerPacket(dstMac: dstMac, type: .ipv4, data: packet.data)
|
||
}
|
||
else {
|
||
SDLLogger.log("[SDLContext] dstIp: \(dstIp.asIpAddress()) arp query not found, broadcast", for: .trace)
|
||
// // 构造arp广播
|
||
// let arpReqeust = ARPPacket.arpRequest(senderIP: networkAddr.ip, senderMAC: networkAddr.mac, targetIP: dstIp)
|
||
// await self.routeLayerPacket(dstMac: ARPPacket.broadcastMac , type: .arp, data: arpReqeust.marshal())
|
||
|
||
try? await self.arpServer.arpRequest(targetIp: dstIp, use: self.quicClient)
|
||
}
|
||
}
|
||
// 不在同一个网段的数据，看到是否配置了网络出口
|
||
// 如果配置了，转发数据个网络出口，否则丢弃
|
||
else if let exitNode = config.exitNode {
|
||
let exitNodeIp: UInt32 = exitNode.exitNodeIp
|
||
SDLLogger.log("[SDLContext] dstIp: \(packet.header.destination.asIpAddress()), use exit_node: \(exitNodeIp.asIpAddress())")
|
||
// 查找arp缓存中是否有目标mac地址
|
||
if let dstMac = await self.arpServer.query(ip: exitNodeIp) {
|
||
await self.routeLayerPacket(dstMac: dstMac, type: .ipv4, data: packet.data)
|
||
}
|
||
else {
|
||
try? await self.arpServer.arpRequest(targetIp: exitNodeIp, use: self.quicClient)
|
||
}
|
||
}
|
||
}
|
||
}
|
||
|
||
private func routeLayerPacket(dstMac: Data, type: LayerPacket.PacketType, data: Data) async {
|
||
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 udpHole = self.udpHole, let dataCipher = self.dataCipher, let encodedPacket = try? dataCipher.encrypt(plainText: 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.identityID = self.config.identityId
|
||
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
|
||
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.log("[SDLContext] step 5 send packet by session: \(session)", for: .trace)
|
||
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
|
||
udpHole.send(type: .data, data: data, remoteAddress: self.config.stunSocketAddress)
|
||
SDLLogger.log("[SDLContext] step 5 send packet by super: \(self.config.stunSocketAddress)", for: .trace)
|
||
// 流量统计
|
||
self.flowTracer.inc(num: data.count, type: .forward)
|
||
|
||
// 尝试打洞
|
||
await self.puncherActor.submitRegisterRequest(quicClient: self.quicClient, request: .init(srcMac: networkAddr.mac, dstMac: dstMac, networkId: networkAddr.networkId))
|
||
}
|
||
}
|
||
}
|
||
|
||
// MARK: 网络改变时需要重新配置网络信息
|
||
private func setNetworkSettings(config: SDLConfiguration, dnsServer: String) async throws {
|
||
let networkAddress = config.networkAddress
|
||
|
||
// 配置路由规则
|
||
var routes: [NEIPv4Route] = [
|
||
NEIPv4Route(destinationAddress: networkAddress.netAddress, subnetMask: networkAddress.maskAddress),
|
||
NEIPv4Route(destinationAddress: dnsServer, subnetMask: "255.255.255.255"),
|
||
]
|
||
|
||
// 如果存在出口节点配置，则接管系统默认留有
|
||
if config.exitNode != nil {
|
||
routes.append(.default())
|
||
}
|
||
|
||
// Add code here to start the process of connecting the tunnel.
|
||
let networkSettings = NEPacketTunnelNetworkSettings(tunnelRemoteAddress: "8.8.8.8")
|
||
networkSettings.mtu = 1250
|
||
|
||
// 设置网卡的DNS解析
|
||
let networkDomain = networkAddress.networkDomain
|
||
let dnsSettings = NEDNSSettings(servers: [dnsServer])
|
||
|
||
dnsSettings.searchDomains = [networkDomain]
|
||
dnsSettings.matchDomains = [networkDomain, ""]
|
||
// 设置为 false 允许系统在补全 Search Domain 时也能匹配到此设置
|
||
dnsSettings.matchDomainsNoSearch = false
|
||
|
||
networkSettings.dnsSettings = dnsSettings
|
||
|
||
let ipv4Settings = NEIPv4Settings(addresses: [networkAddress.ipAddress], subnetMasks: [networkAddress.maskAddress])
|
||
// 设置路由表
|
||
ipv4Settings.includedRoutes = routes
|
||
|
||
// 配置要排除的路由
|
||
ipv4Settings.excludedRoutes = self.getIpv4ExcludeRoutes()
|
||
|
||
networkSettings.ipv4Settings = ipv4Settings
|
||
// 网卡配置设置必须成功
|
||
try await self.provider.setTunnelNetworkSettings(networkSettings)
|
||
}
|
||
|
||
// 探测当前网络的类型
|
||
private func probeNatType() async {
|
||
guard let udpHole = self.udpHole else {
|
||
return
|
||
}
|
||
// 开始探测nat的类型
|
||
self.natType = await self.proberActor.probeNatType(using: udpHole)
|
||
SDLLogger.log("[SDLContext] nat_type is: \(natType)")
|
||
}
|
||
|
||
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)
|
||
}
|
||
}
|
||
}
|
||
}
|
||
|
||
private func getIpv4ExcludeRoutes() -> [NEIPv4Route] {
|
||
// 要排除的路由表
|
||
let dnsServers = SDLUtil.getMacOSSystemDnsServers()
|
||
var ipv4DnsServers = dnsServers.filter {!$0.contains(":")}
|
||
|
||
// 增加常见的dns服务
|
||
let commonDnsServers = [
|
||
"8.8.8.8",
|
||
"8.8.4.4",
|
||
"223.5.5.5",
|
||
"223.6.6.6",
|
||
"114.114.114.114"
|
||
]
|
||
for ip in commonDnsServers {
|
||
if !ipv4DnsServers.contains(ip) {
|
||
ipv4DnsServers.append(ip)
|
||
}
|
||
}
|
||
|
||
return ipv4DnsServers.map { NEIPv4Route(destinationAddress: $0, subnetMask: "255.255.255.255") }
|
||
}
|
||
|
||
deinit {
|
||
self.udpHole = nil
|
||
self.dnsClient = nil
|
||
}
|
||
}
|
||
|
||
private extension UInt32 {
|
||
// 转换成ip地址
|
||
func asIpAddress() -> String {
|
||
return SDLUtil.int32ToIp(self)
|
||
}
|
||
}
|