如何在iOS 11中使用NEDNSProxyProvider

Question

如何在iOS 11中使用NEDNSProxyProvider

16

在网络方面，DNS代理是iOS 11最重要的功能之一。但是关于它们并没有提供太多的文档或示例。有一个讲座也提到了它，但他们只是描述了DNS代理的可能性。

我想创建一个可工作的样例，但直到现在都没有成功。所以我创建了一个带有DNS代理权限的网络扩展并添加了DNS代理提供者。以下是代码：

class DNSProxyProvider: NEDNSProxyProvider {
    let defaults = UserDefaults(suiteName: "group.com.securly.dnsProxy")

    override init() {
        NSLog("QNEDNSProxy.Provider: init")
        super.init()
        // +++ might want to set up KVO on `systemDNSSettings`
    }

    override func startProxy(options:[String: Any]? = nil, completionHandler: @escaping (Error?) -> Void) {
        NSLog("QNEDNSProxy.Provider: start")
        // self.defaults?.set("DidStart", forKey: "DidStart")
        completionHandler(nil)
    }

    override func stopProxy(with reason: NEProviderStopReason, completionHandler: @escaping () -> Void) {
        NSLog("QNEDNSProxy.Provider: stop")
        completionHandler()
    }

    override func handleNewFlow(_ flow: NEAppProxyFlow) -> Bool {
        NSLog("QNEDNSProxy.Provider: new flow (denied)")
        // self.defaults?.set("DidHandleNewFlow", forKey: "DidHandleNewFlow")
        return true
    }

}

然后在AppDelegate中，我声明了一个NEDNSProxyManager并将其用作：

class AppDelegate: UIResponder, UIApplicationDelegate {

    var window: UIWindow?
    let manager = NEDNSProxyManager.shared()

    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {

        self.enable()
        return true
    }

    private func enable() {
        self.update {
            self.manager.localizedDescription = "DNSProxySample"
            let proto = NEDNSProxyProviderProtocol()
            // proto.providerConfiguration = +++
            proto.providerBundleIdentifier = "com.securly.dnsProxy"
            self.manager.providerProtocol = proto
            self.manager.isEnabled = true
        }
    }

    private func disable() {
        self.update {
            self.manager.isEnabled = false
        }
    }

    private func update(_ body: @escaping () -> Void) {
        self.manager.loadFromPreferences { (error) in
            guard error == nil else {
                NSLog("DNSProxySample.App: load error")
                return
            }
            body()
            self.manager.saveToPreferences { (error) in
                guard error == nil else {
                    NSLog("DNSProxySample.App: save error")
                    return
                }
                NSLog("DNSProxySample.App: saved")
            }
        }
    }
}

问题/问题：

为什么没有调用startProxy或者handleNewFlow？设置有什么问题吗？
我该如何提及自定义DNS地址？

Questions/Issues：

为什么没有调用startProxy或handleNewFlow？设置有什么问题吗？
如何提及自定义DNS地址？

- mayuur

1个回答

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可以查看英文原文，
原文链接

- abdullahselek · Accepted Answer

我成功地通过系统触发了DNSProxyProvider上的startProxy和handleFlow。我的配置如下：

Entitlements on app target
Entitlements on DNSProxy Extension Red line is something similar to: group.com.xzy.project_name
Info.plist file on Extension

AppDelegate

import UIKit
import NetworkExtension

@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {

    var window: UIWindow?
    let manager = NEDNSProxyManager.shared()

    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
        self.enable()
        return true
    }

    private func enable() {
        self.update {
            self.manager.localizedDescription = "DNS"
            let proto = NEDNSProxyProviderProtocol()
            proto.providerBundleIdentifier = "EXTENSION_BUNDLE_IDENTIFIER_WHICH_HAS_DNS_PROXY"
            self.manager.providerProtocol = proto
            self.manager.isEnabled = true
        }
    }

    private func disable() {
        self.update {
            self.manager.isEnabled = false
        }
    }

    private func update(_ body: @escaping () -> Void) {
        self.manager.loadFromPreferences { (error) in
            guard error == nil else {
                NSLog("DNS Test App: load error")
                return
            }
            body()
            self.manager.saveToPreferences { (error) in
                guard error == nil else {
                    NSLog("DNS Test App: save error")
                    return
                }
                NSLog("DNS Test App: saved")
            }
        }
    }
}

不要忘记更改捆绑标识符 在这里 proto.providerBundleIdentifier = "具有DNS代理的扩展束标识符"

DNSProxyProvider

import NetworkExtension

class DNSProxyProvider: NEDNSProxyProvider {

    override init() {
        NSLog("DNSProxyProvider: init")
        super.init()
    }

    override func startProxy(options:[String: Any]? = nil, completionHandler: @escaping (Error?) -> Void) {
        NSLog("DNSProxyProvider: startProxy")
        completionHandler(nil)
    }

    override func stopProxy(with reason: NEProviderStopReason, completionHandler: @escaping () -> Void) {
        NSLog("DNSProxyProvider: stopProxy")
        completionHandler()
    }

    override func sleep(completionHandler: @escaping () -> Void) {
        NSLog("DNSProxyProvider: sleep")
        completionHandler()
    }

    override func wake() {
        NSLog("DNSProxyProvider: wake")
    }

    override func handleNewFlow(_ flow: NEAppProxyFlow) -> Bool {
        NSLog("DNSProxyProvider: handleFlow")
        if let tcpFlow = flow as? NEAppProxyTCPFlow {
            let remoteHost = (tcpFlow.remoteEndpoint as! NWHostEndpoint).hostname
            let remotePort = (tcpFlow.remoteEndpoint as! NWHostEndpoint).port
            NSLog("DNSProxyProvider TCP HOST : \(remoteHost)")
            NSLog("DNSProxyProvider TCP PORT : \(remotePort)")
        } else if let udpFlow = flow as? NEAppProxyUDPFlow {
            let localHost = (udpFlow.localEndpoint as! NWHostEndpoint).hostname
            let localPort = (udpFlow.localEndpoint as! NWHostEndpoint).port
            NSLog("DNSProxyProvider UDP HOST : \(localHost)")
            NSLog("DNSProxyProvider UDP PORT : \(localPort)")
        }
        return true
    }

}

As a last step run the app on a real iOS Device.
If you want to display extension logs open Console.app from your Mac.
To debug the extension: Your main app should be selected from run menu. Select Attach to Process by PID or Name... from Xcode's Debug menu and then type your extension's name, press Attach button. After you see the Waiting to attach to EXTENSION_NAME on XYZ's iPhone. Run your app target on a iOS device.