iOS设备判断是否开启VPN

1.导入头文件

#include <ifaddrs.h>

2.声明变量

NSString *const kRRVPNStatusChangedNotification = @"kRRVPNStatusChangedNotification";


{
    BOOL _vpnFlag;
}

3.具体实现方法：

- (BOOL)isVPNOn
{
    BOOL flag = NO;
    NSString *version = [UIDevice currentDevice].systemVersion;
    // need two ways to judge this.
    if (version.doubleValue >= 9.0)
    {
        NSDictionary *dict = CFBridgingRelease(CFNetworkCopySystemProxySettings());
        NSArray *keys = [dict[@"__SCOPED__"] allKeys];
        for (NSString *key in keys) {
            if ([key rangeOfString:@"tap"].location != NSNotFound ||
                [key rangeOfString:@"tun"].location != NSNotFound ||
                [key rangeOfString:@"ipsec"].location != NSNotFound ||
                [key rangeOfString:@"ppp"].location != NSNotFound){
                flag = YES;
                break;
            }
        }
    }
    else
    {
        struct ifaddrs *interfaces = NULL;
        struct ifaddrs *temp_addr = NULL;
        int success = 0;
        
        // retrieve the current interfaces - returns 0 on success
        success = getifaddrs(&interfaces);
        if (success == 0)
        {
            // Loop through linked list of interfaces
            temp_addr = interfaces;
            while (temp_addr != NULL)
            {
                NSString *string = [NSString stringWithFormat:@"%s" , temp_addr->ifa_name];
                if ([string rangeOfString:@"tap"].location != NSNotFound ||
                    [string rangeOfString:@"tun"].location != NSNotFound ||
                    [string rangeOfString:@"ipsec"].location != NSNotFound ||
                    [string rangeOfString:@"ppp"].location != NSNotFound)
                {
                    flag = YES;
                    break;
                }
                temp_addr = temp_addr->ifa_next;
            }
        }
        
        // Free memory
        freeifaddrs(interfaces);
    }
    
    if (_vpnFlag != flag)
    {
        // reset flag
        _vpnFlag = flag;
        
        // post notification
        __weak __typeof(self)weakSelf = self;
        dispatch_async(dispatch_get_main_queue(), ^{
            __strong __typeof(weakSelf)strongSelf = weakSelf;
            [[NSNotificationCenter defaultCenter] postNotificationName:kRRVPNStatusChangedNotification
                                                                object:strongSelf];
        });
    }
    
    return flag;
}