iOS 通过拦截重定向302跳转的方法,获取手机的mac地址(

最近做一个校园网项目,其中有一个需求是获取到手机的mac地址,通过网关控制wifi联网.众所周知,苹果大大很操蛋,喜欢给我们码农找事情.ios7以后说是为了用户隐私不让获取mac地址.官方文档上这样写的：
"Twolow-level networking APIs that used to return a MAC address now return thefixed value 02:00:00:00:00:00. The APIs in question are sysctl(NET_RT_IFLIST) and ioctl(SIOCGIFCONF). Developers using the value of the MAC address should migrate toidentifiers such as -[UIDevice identifierForVendor].This change affects all apps running on iOS 7”。
所以在iOS7以后想要获取设备的唯一标示Mac地址已经不行了，只能用其他的代替。
经过和后台商量,决定用http协议,状态码是302 拦截重定向url获取到手机的mac地址.

原理是这样的 :当连上我们公司的ssid,启动app时向外面发送一个请求,此时我们的ap会收到这个请求之后,返回一个重定向的url给我们.值得一提的是,ap能获取到我们手机的mac地址,那么通过ap返回一个重定向的url,里面拼接了一个mac地址,我们截取这个mac地址就可以了.

对了 需要在项目中配置plist文件 App Transport Security Settings的Allow Arbitrary Loads为YES,不然返回的状态码一直都是0

截取到这个url里面拼接的url包含mac地址

废话 不多说,上代码...
通过NSURLSession方法

#import "ViewController.h"

@interface ViewController ()<NSURLConnectionDelegate,NSURLConnectionDataDelegate,NSURLSessionDelegate,NSURLSessionTaskDelegate>

@end

- (void)viewDidLoad {
    [super viewDidLoad];
    
    
    UIButton *button = [UIButton buttonWithType:(UIButtonTypeCustom)];
    button.frame = CGRectMake(50, 150, 150, 38);
    [button addTarget:self action:@selector(getMac) forControlEvents:(UIControlEventTouchUpInside)];
    [button setTitle:@"获取mac地址" forState:(UIControlStateNormal)];
    [button setTitleColor:[UIColor redColor] forState:(UIControlStateNormal)];
    [self.view addSubview:button];
    

    // Do any additional setup after loading the view, typically from a nib.
}
-(void)getMac{
    
    [self getMacfor];
}

-(void)getMacfor{
    
    NSURL *url = [NSURL URLWithString:@"http://www.google.com"];
    //NSMutableURLRequest *quest = [NSMutableURLRequest requestWithURL:url];
    NSMutableURLRequest *quest = [[NSMutableURLRequest alloc]initWithURL:url cachePolicy:NSURLRequestReloadIgnoringLocalCacheData timeoutInterval:3];
    //    quest.HTTPMethod = @"GET";
    //    NSURLConnection *connect = [NSURLConnection connectionWithRequest:quest delegate:self];
    //    [connect start];
    
    NSURLSessionConfiguration *config = [NSURLSessionConfiguration defaultSessionConfiguration];
    config.requestCachePolicy = NSURLRequestReloadIgnoringLocalCacheData;
    NSURLSession *urlSession = [NSURLSession sessionWithConfiguration:config delegate:self delegateQueue:[NSOperationQueue currentQueue]];
    
    NSURLSessionDataTask *task = [urlSession dataTaskWithRequest:quest completionHandler:^(NSData * _Nullable data, NSURLResponse * _Nullable response, NSError * _Nullable error) {
        
        NSHTTPURLResponse *urlResponse = (NSHTTPURLResponse *)response;
        NSLog(@"状态码是 %ld",urlResponse.statusCode);
        NSLog(@"allheaderfields-- %@",urlResponse.allHeaderFields);
        
        NSDictionary *dic = urlResponse.allHeaderFields;
        NSLog(@"哈哈%@",dic[@"Location"]);
        NSString *location = dic[@"Location"];
        
        long range = [location rangeOfString:@"&mac"].location;
        if (range==NSNotFound) {
            NSLog(@"没有找到");
            [self ShowAlert:@"没有获取到"];
        }else {
            NSLog(@"%ld",range);
            NSLog(@"%@",[location substringWithRange:NSMakeRange(range+5, 17)]);
            
        }
        //http://60.190.139.244:9080/cmps/admin.php/api/login/?gw_address=192.168.51.1&gw_port=2060&gw_id=00037F0064DC&ip=192.168.51.113&mac=48:e9:f1:b7:01:1b
        
        [self ShowAlert:[location substringWithRange:NSMakeRange(range+5, 17)]];
    }];
    
    [task resume];
}

//返回重定向页面
-(void)ShowAlert:(NSString *)str{
    
    
    UIAlertView *alert = [[UIAlertView alloc]initWithTitle:@"提示" message:str delegate:self cancelButtonTitle:@"取消" otherButtonTitles:nil, nil];
    [alert show];
    
}


- (void)URLSession:(NSURLSession *)session task:(NSURLSessionTask *)task
willPerformHTTPRedirection:(NSHTTPURLResponse *)response
        newRequest:(NSURLRequest *)request
 completionHandler:(void (^)(NSURLRequest * __nullable))completionHandler{
    
    completionHandler(nil);
    
    
}
这个获取方法还是蛮有局限性的,需要配置对应的ap,只有添加了重定向的url才能获取的到.不过笔者公司完全可以配置这个了!

附 ios7.0之前获取方法

导入头文件

<sys/sysctl.h> 
<net/if.h> 
<net/if_dl.h> 

- (NSString *) macaddress 
{ 
    
  int         mib[6]; 
  size_t       len; 
  char        *buf; 
  unsigned char    *ptr; 
  struct if_msghdr  *ifm; 
  struct sockaddr_dl *sdl; 
    
  mib[0] = CTL_NET; 
  mib[1] = AF_ROUTE; 
  mib[2] = 0; 
  mib[3] = AF_LINK; 
  mib[4] = NET_RT_IFLIST; 
    
  if ((mib[5] = if_nametoindex("en0")) == 0) { 
    printf("Error: if_nametoindex error/n"); 
    return NULL; 
  } 
    
  if (sysctl(mib, 6, NULL, &len, NULL, 0) < 0) { 
    printf("Error: sysctl, take 1/n"); 
    return NULL; 
  } 
    
  if ((buf = malloc(len)) == NULL) { 
    printf("Could not allocate memory. error!/n"); 
    return NULL; 
  } 
    
  if (sysctl(mib, 6, buf, &len, NULL, 0) < 0) { 
    printf("Error: sysctl, take 2"); 
    return NULL; 
  } 
    
  ifm = (struct if_msghdr *)buf; 
  sdl = (struct sockaddr_dl *)(ifm + 1); 
  ptr = (unsigned char *)LLADDR(sdl); 
  NSString *outstring = [NSString stringWithFormat:@"%02x:%02x:%02x:%02x:%02x:%02x", *ptr, *(ptr+1), *(ptr+2), *(ptr+3), *(ptr+4), *(ptr+5)]; 
    
//  NSString *outstring = [NSString stringWithFormat:@"%02x%02x%02x%02x%02x%02x", *ptr, *(ptr+1), *(ptr+2), *(ptr+3), *(ptr+4), *(ptr+5)]; 
    
  NSLog(@"outString:%@", outstring); 
    
  free(buf); 
    
  return [outstring uppercaseString]; 
}

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