fix dns
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707bb82ea0
commit
8aeb543b17
@ -16,33 +16,36 @@ actor DNSCloudClient {
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case invalidData
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}
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private enum State {
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case idle
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case starting
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case running
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case stopped
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}
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private var state: State = .idle
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private let queue = DispatchQueue(label: "com.sdl.DNSCloudClient.queue")
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private var connection: NWConnection?
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private let dnsServerAddress: NWEndpoint
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private let connection: NWConnection
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// 用于对外输出收到的 DNS 响应包
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nonisolated let packetFlow: AsyncThrowingStream<Data, Error>
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private let packetContinuation: AsyncThrowingStream<Data, Error>.Continuation
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private var isPacketContinuationFinished: Bool = false
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private let readySignal = AsyncOneShot<Void>()
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private var isStopped: Bool = false
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private var isPacketContinuationFinished: Bool = false
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/// - Parameter serverIP: 你的 sn-server IP 地址 (如 "8.8.8.8")
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/// - Parameter port: 端口 (如 53)
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init(serverIP: String, port: UInt16) {
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self.dnsServerAddress = .hostPort(host: Self.makeEndpointHost(address: serverIP), port: NWEndpoint.Port(integerLiteral: port))
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let dnsServerAddress = NWEndpoint.hostPort(host: Self.makeEndpointHost(address: serverIP), port: NWEndpoint.Port(integerLiteral: port))
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let packetPair = AsyncThrowingStream.makeStream(of: Data.self)
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self.packetFlow = packetPair.stream
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self.packetContinuation = packetPair.continuation
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// 1. 配置参数：这是解决环路的关键
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let parameters = NWParameters.udp
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// 禁止此连接走 TUN 网卡（在 NE 中 TUN 通常被归类为 .other）
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parameters.prohibitedInterfaceTypes = [.other]
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// 2. 增强健壮性：启用多路径切换（替代 pathSelectionOptions 的意图）
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parameters.multipathServiceType = .handover
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// 2. 创建连接
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self.connection = NWConnection(to: dnsServerAddress, using: parameters)
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}
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private static func makeEndpointHost(address ip: String) -> NWEndpoint.Host {
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@ -58,46 +61,29 @@ actor DNSCloudClient {
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}
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func run() async throws {
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guard self.state == .idle else {
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return
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}
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self.state = .starting
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// 1. 配置参数：这是解决环路的关键
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let parameters = NWParameters.udp
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// 禁止此连接走 TUN 网卡（在 NE 中 TUN 通常被归类为 .other）
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parameters.prohibitedInterfaceTypes = [.other]
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// 2. 增强健壮性：启用多路径切换（替代 pathSelectionOptions 的意图）
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parameters.multipathServiceType = .handover
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// 2. 创建连接
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let connection = NWConnection(to: self.dnsServerAddress, using: parameters)
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connection.stateUpdateHandler = { [weak self] state in
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self.connection.stateUpdateHandler = { [weak self] state in
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Task {
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await self?.handleConnectionStateUpdate(state, for: connection)
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await self?.handleConnectionStateUpdate(state)
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}
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}
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self.connection = connection
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// 启动连接队列
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connection.start(queue: self.queue)
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self.connection.start(queue: self.queue)
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try await withTaskCancellationHandler {
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try await self.readySignal.wait()
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while true {
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try Task.checkCancellation()
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let data = try await self.readOnce()
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self.packetContinuation.yield(data)
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}
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} onCancel: {
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connection.cancel()
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self.connection.cancel()
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}
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}
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/// 发送 DNS 查询包（由 TUN 拦截到的原始 IP 包数据）
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func forward(ipPacketData: Data) {
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guard self.state == .running,
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let connection = self.connection, connection.state == .ready else {
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guard connection.state == .ready else {
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return
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}
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@ -111,30 +97,25 @@ actor DNSCloudClient {
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}
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func stop() async {
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guard self.state != .stopped else {
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guard !self.isStopped else {
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return
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}
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self.isStopped = true
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self.state = .stopped
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let connection = self.connection
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self.connection = nil
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connection?.cancel()
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self.connection.cancel()
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await self.readySignal.fail(DNSCloudError.cancelled)
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self.finishPacketContinuationIfNeed(throwing: nil)
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SDLLogger.log("[SDLCloudClient] stopped")
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}
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private func handleConnectionStateUpdate(_ state: NWConnection.State, for connection: NWConnection) async {
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private func handleConnectionStateUpdate(_ state: NWConnection.State) async {
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switch state {
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case .ready:
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guard self.state != .stopped, self.isCurrentConnection(connection) else {
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guard !self.isStopped else {
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return
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}
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self.state = .running
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SDLLogger.log("[DNSClient] Connection ready", for: .debug)
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await self.readySignal.succeed(())
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case .failed(let error):
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@ -148,20 +129,13 @@ actor DNSCloudClient {
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}
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}
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private func isCurrentConnection(_ connection: NWConnection) -> Bool {
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guard let currentConnection = self.connection else {
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return false
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}
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return currentConnection === connection
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}
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private func finishPacketContinuationIfNeed(throwing error: DNSCloudError?) {
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guard !self.isPacketContinuationFinished else {
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return
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}
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self.isPacketContinuationFinished = true
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if let error {
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self.packetContinuation.finish(throwing: error)
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} else {
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@ -170,21 +144,27 @@ actor DNSCloudClient {
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}
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private func readOnce() async throws -> Data {
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guard let connection = self.connection, connection.state == .ready else {
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guard self.connection.state == .ready else {
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throw DNSCloudError.cancelled
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}
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return try await withCheckedThrowingContinuation { continuation in
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connection.receiveMessage { content, _, _, error in
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let readContinuation = OnceContinuation<Data, Error>()
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return try await withTaskCancellationHandler {
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try await withCheckedThrowingContinuation { cont in
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readContinuation.set(cont)
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self.connection.receiveMessage { content, _, _, error in
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if let error {
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continuation.resume(throwing: error)
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readContinuation.resume(throwing: error)
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} else if let data = content, !data.isEmpty {
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continuation.resume(returning: data)
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readContinuation.resume(returning: data)
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} else {
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continuation.resume(throwing: DNSCloudError.invalidData)
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readContinuation.resume(throwing: DNSCloudError.invalidData)
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}
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}
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}
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} onCancel: {
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readContinuation.resume(throwing: CancellationError())
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}
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}
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deinit {
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@ -20,35 +20,11 @@ actor DNSCloudService {
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let client = DNSCloudClient(serverIP: self.serverIP, port: 15353)
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self.currentClient = client
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defer {
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self.clearCurrent(client, generation: generation)
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}
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do {
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try await self.run(client: client)
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self.clearCurrent(client, generation: generation)
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await client.stop()
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} catch is CancellationError {
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self.clearCurrent(client, generation: generation)
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await client.stop()
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throw CancellationError()
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} catch {
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self.clearCurrent(client, generation: generation)
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await client.stop()
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throw error
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}
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}
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func stop() async {
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self.generation &+= 1
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let client = self.currentClient
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self.currentClient = nil
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await client?.stop()
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}
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func forward(ipPacketData: Data) async {
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await self.currentClient?.forward(ipPacketData: ipPacketData)
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}
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private func run(client: DNSCloudClient) async throws {
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let onEvent = self.onEvent
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try await withThrowingTaskGroup(of: Void.self) { group in
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@ -69,6 +45,28 @@ actor DNSCloudService {
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_ = try await group.next()
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}
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await client.stop()
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} catch is CancellationError {
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await client.stop()
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throw CancellationError()
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} catch {
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await client.stop()
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throw error
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}
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}
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func stop() async {
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self.generation &+= 1
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let client = self.currentClient
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self.currentClient = nil
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await client?.stop()
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}
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func forward(ipPacketData: Data) async {
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await self.currentClient?.forward(ipPacketData: ipPacketData)
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}
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private func nextGeneration() -> UInt64 {
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