For the black industry of APP, we mentioned that some users will bypass the wind control strategy by changing IP. A more convenient way to change IP is to use proxy IP or VPN.

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In testing APP security is required to make a judgment on whether to use the code and VPN. The following is a compilation of some codes for reference.

Android determine whether to use proxy IP

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private boolean isWifiProxy(Context context) {
    final boolean IS_ICS_OR_LATER = Build.VERSION.SDK_INT >= Build.VERSION_CODES.ICE_CREAM_SANDWICH;
    String proxyAddress;
    int proxyPort;

    if (IS_ICS_OR_LATER) {
        proxyAddress = System.getProperty("http.proxyHost");
        String portStr = System.getProperty("http.proxyPort");
        proxyPort = Integer.parseInt((portStr != null ? portStr : "-1"));
    } else {
        proxyAddress = android.net.Proxy.getHost(context);
        proxyPort = android.net.Proxy.getPort(context);
    }
    return (!TextUtils.isEmpty(proxyAddress)) && (proxyPort != -1);
}

Android to determine whether to use VPN

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boolean checkVPN(ConnectivityManager connMgr) {
    //don't know why always returns null:
    NetworkInfo networkInfo = connMgr.getNetworkInfo(ConnectivityManager.TYPE_VPN);

    boolean isVpnConn = networkInfo == null ? false : networkInfo.isConnected();
    return isVpnConn;
}

iOS to determine whether to use proxy IP

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#import "CETCProxyStatus.h"

@implementation CETCProxyStatus

+ (BOOL)getProxyStatus {
    NSDictionary *proxySettings = NSMakeCollectable([(NSDictionary *)CFNetworkCopySystemProxySettings() autorelease]);

    NSArray *proxies = NSMakeCollectable([(NSArray *)CFNetworkCopyProxiesForURL((CFURLRef)[NSURL URLWithString:@"http://www.baidu.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;
    }
}

iOS determines if a VPN is being used

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- (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);
   }


   return flag;
}