147 lines
4.3 KiB
Swift
147 lines
4.3 KiB
Swift
//
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// PacketTunnelProvider.swift
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// punchnet
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//
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// Created by 安礼成 on 2025/8/3.
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//
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import NetworkExtension
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enum TunnelError: Error {
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case invalidConfiguration
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case invalidContext
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}
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class PacketTunnelProvider: NEPacketTunnelProvider {
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private var runtimeEnv: SDLRuntimeEnvironment?
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override func startTunnel(options: [String: NSObject]?, completionHandler: @escaping (Error?) -> Void) {
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// 如果当前在运行状态，不允许重复请求
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guard self.runtimeEnv == nil else {
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completionHandler(TunnelError.invalidContext)
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return
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}
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guard let options else {
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completionHandler(TunnelError.invalidConfiguration)
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return
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}
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self.runtimeEnv = SDLRuntimeEnvironment(options: options)
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Task {
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do {
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try await self.runtimeEnv?.start(provider: self)
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completionHandler(nil)
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} catch let err {
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completionHandler(err)
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}
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}
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}
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override func stopTunnel(with reason: NEProviderStopReason, completionHandler: @escaping () -> Void) {
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// Add code here to start the process of stopping the tunnel.
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Task {
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await self.runtimeEnv?.stop()
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completionHandler()
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}
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}
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override func handleAppMessage(_ messageData: Data, completionHandler: ((Data?) -> Void)?) {
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// Add code here to handle the message.
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Task {
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do {
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let message = try AppRequest(serializedBytes: messageData)
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let replyData = try await self.handleAppRequest(message: message)
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completionHandler?(replyData)
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} catch let err {
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var reply = TunnelResponse()
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reply.code = 1
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reply.message = err.localizedDescription
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let errorReplyData = try? reply.serializedData()
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completionHandler?(errorReplyData)
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}
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}
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}
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override func sleep(completionHandler: @escaping () -> Void) {
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// Add code here to get ready to sleep.
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Task {
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await self.runtimeEnv?.stop()
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completionHandler()
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}
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}
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override func wake() {
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// Add code here to wake up.
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Task {
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try await self.runtimeEnv?.start(provider: self)
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}
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}
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private func handleAppRequest(message: AppRequest) async throws -> Data? {
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guard let contextActor = self.runtimeEnv?.getContextActor() else {
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throw TunnelError.invalidContext
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}
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switch message.command {
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case .changeExitNode(let changeExitNode):
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let exitNodeIp = changeExitNode.ip
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do {
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try await contextActor.updateExitNode(exitNodeIp: exitNodeIp)
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var reply = TunnelResponse()
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reply.code = 0
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reply.message = "操作成功"
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return try reply.serializedData()
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} catch let err {
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var reply = TunnelResponse()
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reply.code = 1
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reply.message = err.localizedDescription
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return try reply.serializedData()
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}
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case .none:
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var reply = TunnelResponse()
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reply.code = 1
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reply.message = "无效请求"
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return try reply.serializedData()
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}
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}
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}
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private class SDLRuntimeEnvironment {
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var contextActor: SDLContextActor?
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private var options: [String: NSObject]
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init(options: [String: NSObject]) {
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self.options = options
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}
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func start(provider: PacketTunnelProvider) async throws {
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// 重置通知中心
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SDLTunnelAppNotifier.shared.clear()
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guard let config = await SDLConfiguration.parse(options: options) else {
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throw TunnelError.invalidConfiguration
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}
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// 加密算法
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let rsaCipher = try! CCRSACipher(keySize: 1024)
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let contextActor = SDLContextActor(provider: provider, config: config, rsaCipher: rsaCipher)
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self.contextActor = contextActor
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await contextActor.start()
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}
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func getContextActor() -> SDLContextActor? {
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return self.contextActor
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}
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func stop() async {
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await self.contextActor?.stop()
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}
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}
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