108 lines
3.5 KiB
Swift
108 lines
3.5 KiB
Swift
//
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// SDLDNSClient 2.swift
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// punchnet
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//
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// Created by 安礼成 on 2026/4/9.
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//
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import Foundation
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import Network
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final class DNSCloudClient {
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private var connection: NWConnection?
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private let logger: SDLLogger
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private let dnsServerAddress: NWEndpoint
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// 用于对外输出收到的 DNS 响应包
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public let packetFlow: AsyncStream<Data>
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private let packetContinuation: AsyncStream<Data>.Continuation
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// 用来处理关闭事件
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private let (closeStream, closeContinuation) = AsyncStream.makeStream(of: Void.self)
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/// - Parameter host: 你的 sn-server 地址 (如 "8.8.8.8")
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/// - Parameter port: 端口 (如 53)
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init(host: String, port: UInt16, logger: SDLLogger) {
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self.logger = logger
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self.dnsServerAddress = .hostPort(host: NWEndpoint.Host(host), port: NWEndpoint.Port(integerLiteral: port))
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let (stream, continuation) = AsyncStream.makeStream(of: Data.self, bufferingPolicy: .unbounded)
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self.packetFlow = stream
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self.packetContinuation = continuation
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}
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func start() {
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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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self.connection = connection
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connection.stateUpdateHandler = { [weak self] state in
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switch state {
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case .ready:
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self?.logger.log("[DNSClient] Connection ready", level: .debug)
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self?.receiveLoop() // 开始循环接收数据
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case .failed(let error):
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self?.logger.log("[DNSClient] Connection failed: \(error)", level: .error)
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self?.stop()
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case .cancelled:
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self?.packetContinuation.finish()
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self?.closeContinuation.finish()
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default:
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break
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}
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}
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// 启动连接队列
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connection.start(queue: .global())
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}
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public func waitClose() async {
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for await _ in closeStream { }
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}
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/// 接收数据的递归循环
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private func receiveLoop() {
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connection?.receiveMessage { [weak self] content, _, isComplete, error in
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if let data = content, !data.isEmpty {
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// 将收到的 DNS 响应写回 AsyncStream
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self?.packetContinuation.yield(data)
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}
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if error == nil && self?.connection?.state == .ready {
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self?.receiveLoop() // 继续监听下一个包
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}
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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 let connection = self.connection, connection.state == .ready else {
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return
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}
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connection.send(content: ipPacketData, completion: .contentProcessed { [weak self] error in
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if let error = error {
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self?.logger.log("[DNSClient] Send error: \(error)", level: .error)
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}
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})
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}
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func stop() {
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connection?.cancel()
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connection = nil
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}
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deinit {
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stop()
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}
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}
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