iOS：检测使用VPN或Proxy

参考链接：
https://www.jianshu.com/p/c3b950dbf86a
https://gist.github.com/PramodJoshi/4faad4c91f7dcb4eb9b06be8390c01db
http://noodlecode.net/2018/04/check-if-ios-app-is-connected-to-vpn

第一种方法

需要导入框架CFNetwork
然后，这个方法是mrc的：需要添加-fno-objc-arc的flag
代码如下：

+ (BOOL)getProxyStatus {
    NSDictionary *proxySettings = NSMakeCollectable([(NSDictionary *)CFNetworkCopySystemProxySettings() autorelease]);
    NSArray *proxies = NSMakeCollectable([(NSArray *)CFNetworkCopyProxiesForURL((CFURLRef)[NSURL URLWithString:@"http://www.google.com"], (CFDictionaryRef)proxySettings) autorelease]);
    NSDictionary *settings = [proxies objectAtIndex:0];
    
    NSLog(@"host=%@", [settings objectForKey:(NSString *)kCFProxyHostNameKey]);
    NSLog(@"port=%@", [settings objectForKey:(NSString *)kCFProxyPortNumberKey]);
    NSLog(@"type=%@", [settings objectForKey:(NSString *)kCFProxyTypeKey]);
    
    if ([[settings objectForKey:(NSString *)kCFProxyTypeKey] isEqualToString:@"kCFProxyTypeNone"])
    {
        //没有设置代理
        return NO;
    }
    else
    {
        //设置代理了
        return YES;
    }
}

第二种方法

func isVPNConnected() -> Bool {

    let cfDict = CFNetworkCopySystemProxySettings()

    let nsDict = cfDict!.takeRetainedValue() as NSDictionary

    let keys = nsDict["__SCOPED__"] as! NSDictionary

    for key: String in keys.allKeys as! [String] {

        if (key == "tap" || key == "tun" || key == "ppp" || key == "ipsec" || key == "ipsec0") {

            return true

        }

    }

    return false

}

第三种方法

func isConnectedToVpn() -> Bool {

    let host = "www.example.com"

    guard let reachability = SCNetworkReachabilityCreateWithName(nil, host) else {

        return false

    }

    var flags = SCNetworkReachabilityFlags()

    if SCNetworkReachabilityGetFlags(reachability, &flags) == false {

        return false

    }

    let isOnline = flags.contains(.reachable) && !flags.contains(.connectionRequired)

    if !isOnline {

        return false

    }

    let isMobileNetwork = flags.contains(.isWWAN)

    let isTransientConnection = flags.contains(.transientConnection)

    if isMobileNetwork {

        if let settings = CFNetworkCopySystemProxySettings()?.takeRetainedValue() as? Dictionary<String, Any>,

            let scopes = settings["__SCOPED__"] as? [String:Any] {

            for (key, _) in scopes {

                if key.contains("tap") || key.contains("tun") || key.contains("ppp") {

                    return true

                }

            }

        }

        return false

    } else {

        return isTransientConnection

    }

}

func isConnectedToProxy() -> Bool { let host = "http://www.example.com" if let url = URL(string: host), let proxySettingsUnmanaged = CFNetworkCopySystemProxySettings() { let proxySettings = proxySettingsUnmanaged.takeRetainedValue() let proxyUnmanaged = CFNetworkCopyProxiesForURL(url as CFURL, proxySettings) if let proxies = proxyUnmanaged.takeRetainedValue() as? [[String : AnyObject]], proxies.count > 0 { let proxy = proxies[0] let key = kCFProxyTypeKey as String let value = kCFProxyTypeNone as String if let v = proxy[key] as? String, v != value { return true } } } return false }